Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
0bb7724a | 24 | #include <paths.h> |
fac6795d DG |
25 | #include <pthread.h> |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
331744e3 | 30 | #include <inttypes.h> |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c | 37 | #include <sys/wait.h> |
5c827ce0 | 38 | #include <urcu/uatomic.h> |
fac6795d | 39 | #include <unistd.h> |
4f0b90ee | 40 | #include <ctype.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
e8fa9fb0 | 44 | #include <common/compat/getenv.h> |
db758600 DG |
45 | #include <common/defaults.h> |
46 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 47 | #include <common/futex.h> |
00e2e675 | 48 | #include <common/relayd/relayd.h> |
81b86775 | 49 | #include <common/utils.h> |
3ccdf997 | 50 | #include <common/daemonize.h> |
f40ef1d5 | 51 | #include <common/config/session-config.h> |
dcabc190 FD |
52 | #include <common/dynamic-buffer.h> |
53 | #include <lttng/userspace-probe-internal.h> | |
76fcf151 | 54 | #include <lttng/event-internal.h> |
fac6795d | 55 | |
10a8a223 | 56 | #include "lttng-sessiond.h" |
7972aab2 | 57 | #include "buffer-registry.h" |
54d01ffb | 58 | #include "channel.h" |
2f77fc4b | 59 | #include "cmd.h" |
00e2e675 | 60 | #include "consumer.h" |
099e26bd | 61 | #include "context.h" |
54d01ffb | 62 | #include "event.h" |
4771f025 | 63 | #include "kernel.h" |
f1e16794 | 64 | #include "kernel-consumer.h" |
096102bd | 65 | #include "modprobe.h" |
0fdd1e2c | 66 | #include "shm.h" |
1e307fab | 67 | #include "ust-ctl.h" |
00e2e675 | 68 | #include "ust-consumer.h" |
8e68d1c8 | 69 | #include "utils.h" |
4063050c | 70 | #include "fd-limit.h" |
8782cc74 | 71 | #include "health-sessiond.h" |
8ac94142 | 72 | #include "testpoint.h" |
d0b96690 | 73 | #include "ust-thread.h" |
022d91ba | 74 | #include "agent-thread.h" |
fb198a11 | 75 | #include "save.h" |
ef367a93 | 76 | #include "load-session-thread.h" |
b3530820 JG |
77 | #include "notification-thread.h" |
78 | #include "notification-thread-commands.h" | |
db66e574 | 79 | #include "rotation-thread.h" |
0dbc2034 | 80 | #include "lttng-syscall.h" |
7c1d2758 | 81 | #include "agent.h" |
5e97de00 | 82 | #include "ht-cleanup.h" |
e6142f2e | 83 | #include "sessiond-config.h" |
8e319828 | 84 | #include "timer.h" |
ebaeda94 | 85 | |
4fc83d94 PP |
86 | static const char *help_msg = |
87 | #ifdef LTTNG_EMBED_HELP | |
88 | #include <lttng-sessiond.8.h> | |
89 | #else | |
90 | NULL | |
91 | #endif | |
92 | ; | |
93 | ||
fac6795d | 94 | const char *progname; |
c9cb3e7d | 95 | static int lockfile_fd = -1; |
3bd1e081 | 96 | |
0bb7724a DG |
97 | /* Set to 1 when a SIGUSR1 signal is received. */ |
98 | static int recv_child_signal; | |
99 | ||
88076e89 JD |
100 | static struct lttng_kernel_tracer_version kernel_tracer_version; |
101 | static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; | |
102 | ||
a23ec3a7 DG |
103 | /* |
104 | * Consumer daemon specific control data. Every value not initialized here is | |
105 | * set to 0 by the static definition. | |
106 | */ | |
3bd1e081 MD |
107 | static struct consumer_data kconsumer_data = { |
108 | .type = LTTNG_CONSUMER_KERNEL, | |
03550b58 MD |
109 | .err_sock = -1, |
110 | .cmd_sock = -1, | |
b3530820 | 111 | .channel_monitor_pipe = -1, |
173af62f DG |
112 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
113 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
114 | .cond = PTHREAD_COND_INITIALIZER, |
115 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 116 | }; |
7753dea8 MD |
117 | static struct consumer_data ustconsumer64_data = { |
118 | .type = LTTNG_CONSUMER64_UST, | |
03550b58 MD |
119 | .err_sock = -1, |
120 | .cmd_sock = -1, | |
b3530820 | 121 | .channel_monitor_pipe = -1, |
173af62f DG |
122 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
123 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
124 | .cond = PTHREAD_COND_INITIALIZER, |
125 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
126 | }; |
127 | static struct consumer_data ustconsumer32_data = { | |
128 | .type = LTTNG_CONSUMER32_UST, | |
03550b58 MD |
129 | .err_sock = -1, |
130 | .cmd_sock = -1, | |
b3530820 | 131 | .channel_monitor_pipe = -1, |
173af62f DG |
132 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
133 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
134 | .cond = PTHREAD_COND_INITIALIZER, |
135 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
136 | }; |
137 | ||
26296c48 JG |
138 | /* Command line options */ |
139 | static const struct option long_options[] = { | |
0f5ea17c JG |
140 | { "client-sock", required_argument, 0, 'c' }, |
141 | { "apps-sock", required_argument, 0, 'a' }, | |
142 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
143 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
144 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
145 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
146 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
147 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
148 | { "consumerd32-path", required_argument, 0, '\0' }, | |
149 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
150 | { "consumerd64-path", required_argument, 0, '\0' }, | |
151 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
152 | { "daemonize", no_argument, 0, 'd' }, | |
153 | { "background", no_argument, 0, 'b' }, | |
154 | { "sig-parent", no_argument, 0, 'S' }, | |
155 | { "help", no_argument, 0, 'h' }, | |
156 | { "group", required_argument, 0, 'g' }, | |
157 | { "version", no_argument, 0, 'V' }, | |
158 | { "quiet", no_argument, 0, 'q' }, | |
159 | { "verbose", no_argument, 0, 'v' }, | |
160 | { "verbose-consumer", no_argument, 0, '\0' }, | |
161 | { "no-kernel", no_argument, 0, '\0' }, | |
162 | { "pidfile", required_argument, 0, 'p' }, | |
163 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
164 | { "config", required_argument, 0, 'f' }, | |
165 | { "load", required_argument, 0, 'l' }, | |
166 | { "kmod-probes", required_argument, 0, '\0' }, | |
167 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
168 | { NULL, 0, 0, 0 } |
169 | }; | |
170 | ||
171 | /* Command line options to ignore from configuration file */ | |
172 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
173 | ||
26c9d55e | 174 | /* Shared between threads */ |
099e26bd | 175 | static int dispatch_thread_exit; |
fac6795d | 176 | |
1d4b027a | 177 | /* Sockets and FDs */ |
a4b35e07 MD |
178 | static int client_sock = -1; |
179 | static int apps_sock = -1; | |
76d7553f | 180 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 181 | |
099e26bd DG |
182 | /* |
183 | * This pipe is used to inform the thread managing application communication | |
184 | * that a command is queued and ready to be processed. | |
185 | */ | |
76d7553f | 186 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 187 | |
1d4b027a | 188 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 189 | static pthread_t apps_thread; |
d0b96690 | 190 | static pthread_t apps_notify_thread; |
099e26bd | 191 | static pthread_t reg_apps_thread; |
1d4b027a | 192 | static pthread_t client_thread; |
7a485870 | 193 | static pthread_t kernel_thread; |
099e26bd | 194 | static pthread_t dispatch_thread; |
44a5e5eb | 195 | static pthread_t health_thread; |
0b2dc8df | 196 | static pthread_t ht_cleanup_thread; |
022d91ba | 197 | static pthread_t agent_reg_thread; |
ef367a93 | 198 | static pthread_t load_session_thread; |
b3530820 | 199 | static pthread_t notification_thread; |
db66e574 | 200 | static pthread_t rotation_thread; |
d086f507 | 201 | static pthread_t timer_thread; |
5eb91c98 | 202 | |
099e26bd DG |
203 | /* |
204 | * UST registration command queue. This queue is tied with a futex and uses a N | |
205 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
206 | * | |
b22c5da8 DG |
207 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
208 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
209 | * the line new application socket and monitors it for any I/O error or clean | |
210 | * close that triggers an unregistration of the application. | |
099e26bd DG |
211 | */ |
212 | static struct ust_cmd_queue ust_cmd_queue; | |
213 | ||
b5541356 DG |
214 | /* |
215 | * Pointer initialized before thread creation. | |
216 | * | |
217 | * This points to the tracing session list containing the session count and a | |
218 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
219 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 220 | * |
d063d709 | 221 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 222 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
223 | */ |
224 | static struct ltt_session_list *session_list_ptr; | |
225 | ||
2f77fc4b DG |
226 | static const char *module_proc_lttng = "/proc/lttng"; |
227 | ||
5c827ce0 DG |
228 | /* |
229 | * Consumer daemon state which is changed when spawning it, killing it or in | |
230 | * case of a fatal error. | |
231 | */ | |
232 | enum consumerd_state { | |
233 | CONSUMER_STARTED = 1, | |
234 | CONSUMER_STOPPED = 2, | |
235 | CONSUMER_ERROR = 3, | |
236 | }; | |
237 | ||
238 | /* | |
239 | * This consumer daemon state is used to validate if a client command will be | |
240 | * able to reach the consumer. If not, the client is informed. For instance, | |
241 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
242 | * error to the client. | |
243 | * | |
244 | * The following example shows a possible race condition of this scheme: | |
245 | * | |
246 | * consumer thread error happens | |
247 | * client cmd arrives | |
248 | * client cmd checks state -> still OK | |
249 | * consumer thread exit, sets error | |
250 | * client cmd try to talk to consumer | |
251 | * ... | |
252 | * | |
253 | * However, since the consumer is a different daemon, we have no way of making | |
254 | * sure the command will reach it safely even with this state flag. This is why | |
255 | * we consider that up to the state validation during command processing, the | |
256 | * command is safe. After that, we can not guarantee the correctness of the | |
257 | * client request vis-a-vis the consumer. | |
258 | */ | |
259 | static enum consumerd_state ust_consumerd_state; | |
260 | static enum consumerd_state kernel_consumerd_state; | |
261 | ||
ef367a93 | 262 | /* Load session thread information to operate. */ |
a7333da7 | 263 | static struct load_session_thread_data *load_info; |
7c1d2758 | 264 | |
97bc1426 | 265 | /* |
a7333da7 | 266 | * Section name to look for in the daemon configuration file. |
97bc1426 | 267 | */ |
a7333da7 | 268 | static const char * const config_section_name = "sessiond"; |
5e97de00 | 269 | |
a7333da7 JG |
270 | /* Am I root or not. Set to 1 if the daemon is running as root */ |
271 | static int is_root; | |
5eb91c98 | 272 | |
a7333da7 JG |
273 | /* Rotation thread handle. */ |
274 | static struct rotation_thread_handle *rotation_thread_handle; | |
4a15001e | 275 | |
099e26bd DG |
276 | /* |
277 | * Stop all threads by closing the thread quit pipe. | |
278 | */ | |
cf3af59e MD |
279 | static void stop_threads(void) |
280 | { | |
5eb91c98 DG |
281 | int ret; |
282 | ||
cf3af59e MD |
283 | /* Stopping all threads */ |
284 | DBG("Terminating all threads"); | |
a7333da7 | 285 | ret = sessiond_notify_quit_pipe(); |
5eb91c98 DG |
286 | if (ret < 0) { |
287 | ERR("write error on thread quit pipe"); | |
288 | } | |
289 | ||
099e26bd | 290 | /* Dispatch thread */ |
26c9d55e | 291 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 292 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
293 | } |
294 | ||
e975f9f8 DG |
295 | /* |
296 | * Close every consumer sockets. | |
297 | */ | |
298 | static void close_consumer_sockets(void) | |
299 | { | |
300 | int ret; | |
301 | ||
302 | if (kconsumer_data.err_sock >= 0) { | |
303 | ret = close(kconsumer_data.err_sock); | |
304 | if (ret < 0) { | |
305 | PERROR("kernel consumer err_sock close"); | |
306 | } | |
307 | } | |
308 | if (ustconsumer32_data.err_sock >= 0) { | |
309 | ret = close(ustconsumer32_data.err_sock); | |
310 | if (ret < 0) { | |
a76cbd9f | 311 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
312 | } |
313 | } | |
314 | if (ustconsumer64_data.err_sock >= 0) { | |
315 | ret = close(ustconsumer64_data.err_sock); | |
316 | if (ret < 0) { | |
a76cbd9f | 317 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
318 | } |
319 | } | |
320 | if (kconsumer_data.cmd_sock >= 0) { | |
321 | ret = close(kconsumer_data.cmd_sock); | |
322 | if (ret < 0) { | |
323 | PERROR("kernel consumer cmd_sock close"); | |
324 | } | |
325 | } | |
326 | if (ustconsumer32_data.cmd_sock >= 0) { | |
327 | ret = close(ustconsumer32_data.cmd_sock); | |
328 | if (ret < 0) { | |
a76cbd9f | 329 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
330 | } |
331 | } | |
332 | if (ustconsumer64_data.cmd_sock >= 0) { | |
333 | ret = close(ustconsumer64_data.cmd_sock); | |
334 | if (ret < 0) { | |
a76cbd9f | 335 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
336 | } |
337 | } | |
b3530820 JG |
338 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
339 | ret = close(kconsumer_data.channel_monitor_pipe); | |
340 | if (ret < 0) { | |
341 | PERROR("kernel consumer channel monitor pipe close"); | |
342 | } | |
343 | } | |
344 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { | |
345 | ret = close(ustconsumer32_data.channel_monitor_pipe); | |
346 | if (ret < 0) { | |
347 | PERROR("UST consumerd32 channel monitor pipe close"); | |
348 | } | |
349 | } | |
350 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { | |
351 | ret = close(ustconsumer64_data.channel_monitor_pipe); | |
352 | if (ret < 0) { | |
353 | PERROR("UST consumerd64 channel monitor pipe close"); | |
354 | } | |
355 | } | |
e975f9f8 DG |
356 | } |
357 | ||
4e4714cb JR |
358 | /* |
359 | * Wait on consumer process termination. | |
360 | * | |
361 | * Need to be called with the consumer data lock held or from a context | |
362 | * ensuring no concurrent access to data (e.g: cleanup). | |
363 | */ | |
364 | static void wait_consumer(struct consumer_data *consumer_data) | |
365 | { | |
366 | pid_t ret; | |
367 | int status; | |
368 | ||
369 | if (consumer_data->pid <= 0) { | |
370 | return; | |
371 | } | |
372 | ||
373 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
374 | consumer_data->pid); | |
375 | ret = waitpid(consumer_data->pid, &status, 0); | |
376 | if (ret == -1) { | |
377 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
1640c24c | 378 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
379 | ERR("consumerd termination with error: %d", |
380 | WEXITSTATUS(ret)); | |
381 | } | |
382 | consumer_data->pid = 0; | |
383 | } | |
384 | ||
fac6795d | 385 | /* |
4a15001e | 386 | * Cleanup the session daemon's data structures. |
fac6795d | 387 | */ |
4a15001e | 388 | static void sessiond_cleanup(void) |
fac6795d | 389 | { |
ef599319 | 390 | int ret; |
af9737e9 | 391 | struct ltt_session *sess, *stmp; |
fac6795d | 392 | |
4a15001e | 393 | DBG("Cleanup sessiond"); |
e07ae692 | 394 | |
4e449f3f MD |
395 | /* |
396 | * Close the thread quit pipe. It has already done its job, | |
397 | * since we are now called. | |
398 | */ | |
a7333da7 | 399 | sessiond_close_quit_pipe(); |
2f77fc4b | 400 | |
c9a2957d JG |
401 | ret = remove(config.pid_file_path.value); |
402 | if (ret < 0) { | |
403 | PERROR("remove pidfile %s", config.pid_file_path.value); | |
35f90c40 DG |
404 | } |
405 | ||
e6142f2e JG |
406 | DBG("Removing sessiond and consumerd content of directory %s", |
407 | config.rundir.value); | |
8c6c56c2 MD |
408 | |
409 | /* sessiond */ | |
e6142f2e JG |
410 | DBG("Removing %s", config.pid_file_path.value); |
411 | (void) unlink(config.pid_file_path.value); | |
8c6c56c2 | 412 | |
e6142f2e JG |
413 | DBG("Removing %s", config.agent_port_file_path.value); |
414 | (void) unlink(config.agent_port_file_path.value); | |
cd9290dd | 415 | |
8c6c56c2 | 416 | /* kconsumerd */ |
e6142f2e JG |
417 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
418 | (void) unlink(kconsumer_data.err_unix_sock_path); | |
419 | ||
420 | DBG("Removing directory %s", config.kconsumerd_path.value); | |
421 | (void) rmdir(config.kconsumerd_path.value); | |
8c6c56c2 MD |
422 | |
423 | /* ust consumerd 32 */ | |
e6142f2e JG |
424 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
425 | (void) unlink(config.consumerd32_err_unix_sock_path.value); | |
426 | ||
427 | DBG("Removing directory %s", config.consumerd32_path.value); | |
428 | (void) rmdir(config.consumerd32_path.value); | |
8c6c56c2 MD |
429 | |
430 | /* ust consumerd 64 */ | |
e6142f2e JG |
431 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
432 | (void) unlink(config.consumerd64_err_unix_sock_path.value); | |
433 | ||
434 | DBG("Removing directory %s", config.consumerd64_path.value); | |
435 | (void) rmdir(config.consumerd64_path.value); | |
5461b305 | 436 | |
99bab54f | 437 | DBG("Cleaning up all sessions"); |
fac6795d | 438 | |
b5541356 | 439 | /* Destroy session list mutex */ |
273ea72c DG |
440 | if (session_list_ptr != NULL) { |
441 | pthread_mutex_destroy(&session_list_ptr->lock); | |
442 | ||
443 | /* Cleanup ALL session */ | |
54d01ffb DG |
444 | cds_list_for_each_entry_safe(sess, stmp, |
445 | &session_list_ptr->head, list) { | |
90936dcf JD |
446 | cmd_destroy_session(sess, kernel_poll_pipe[1], |
447 | notification_thread_handle); | |
273ea72c DG |
448 | } |
449 | } | |
450 | ||
4e4714cb JR |
451 | wait_consumer(&kconsumer_data); |
452 | wait_consumer(&ustconsumer64_data); | |
453 | wait_consumer(&ustconsumer32_data); | |
454 | ||
6a4e4039 JG |
455 | DBG("Cleaning up all agent apps"); |
456 | agent_app_ht_clean(); | |
457 | ||
099e26bd | 458 | DBG("Closing all UST sockets"); |
56fff090 | 459 | ust_app_clean_list(); |
7972aab2 | 460 | buffer_reg_destroy_registries(); |
099e26bd | 461 | |
e6142f2e | 462 | if (is_root && !config.no_kernel) { |
4fba7219 | 463 | DBG2("Closing kernel fd"); |
a4b35e07 | 464 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
465 | ret = close(kernel_tracer_fd); |
466 | if (ret) { | |
467 | PERROR("close"); | |
468 | } | |
a4b35e07 | 469 | } |
2f50c8a3 | 470 | DBG("Unloading kernel modules"); |
096102bd | 471 | modprobe_remove_lttng_all(); |
834978fd | 472 | free(syscall_table); |
2f50c8a3 | 473 | } |
2f77fc4b | 474 | |
e975f9f8 DG |
475 | close_consumer_sockets(); |
476 | ||
ef367a93 JG |
477 | if (load_info) { |
478 | load_session_destroy_data(load_info); | |
479 | free(load_info); | |
480 | } | |
481 | ||
c9cb3e7d JG |
482 | /* |
483 | * We do NOT rmdir rundir because there are other processes | |
484 | * using it, for instance lttng-relayd, which can start in | |
485 | * parallel with this teardown. | |
486 | */ | |
4a15001e MD |
487 | } |
488 | ||
489 | /* | |
490 | * Cleanup the daemon's option data structures. | |
491 | */ | |
492 | static void sessiond_cleanup_options(void) | |
493 | { | |
494 | DBG("Cleaning up options"); | |
495 | ||
e6142f2e | 496 | sessiond_config_fini(&config); |
c9cb3e7d | 497 | |
7567352f | 498 | run_as_destroy_worker(); |
fac6795d DG |
499 | } |
500 | ||
e065084a | 501 | /* |
d063d709 | 502 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 503 | * |
d063d709 | 504 | * Return lttcomm error code. |
e065084a DG |
505 | */ |
506 | static int send_unix_sock(int sock, void *buf, size_t len) | |
507 | { | |
508 | /* Check valid length */ | |
c617c0c6 | 509 | if (len == 0) { |
e065084a DG |
510 | return -1; |
511 | } | |
512 | ||
513 | return lttcomm_send_unix_sock(sock, buf, len); | |
514 | } | |
515 | ||
5461b305 | 516 | /* |
d063d709 | 517 | * Free memory of a command context structure. |
5461b305 | 518 | */ |
a2fb29a5 | 519 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 520 | { |
a2fb29a5 DG |
521 | DBG("Clean command context structure"); |
522 | if (*cmd_ctx) { | |
523 | if ((*cmd_ctx)->llm) { | |
524 | free((*cmd_ctx)->llm); | |
5461b305 | 525 | } |
a2fb29a5 DG |
526 | if ((*cmd_ctx)->lsm) { |
527 | free((*cmd_ctx)->lsm); | |
5461b305 | 528 | } |
a2fb29a5 DG |
529 | free(*cmd_ctx); |
530 | *cmd_ctx = NULL; | |
5461b305 DG |
531 | } |
532 | } | |
533 | ||
fac6795d | 534 | /* |
0fdd1e2c | 535 | * Notify UST applications using the shm mmap futex. |
fac6795d | 536 | */ |
0fdd1e2c | 537 | static int notify_ust_apps(int active) |
fac6795d | 538 | { |
0fdd1e2c | 539 | char *wait_shm_mmap; |
fac6795d | 540 | |
0fdd1e2c | 541 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 542 | |
0fdd1e2c | 543 | /* See shm.c for this call implying mmap, shm and futex calls */ |
e6142f2e | 544 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
0fdd1e2c | 545 | if (wait_shm_mmap == NULL) { |
fac6795d DG |
546 | goto error; |
547 | } | |
548 | ||
0fdd1e2c DG |
549 | /* Wake waiting process */ |
550 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
551 | ||
552 | /* Apps notified successfully */ | |
553 | return 0; | |
fac6795d DG |
554 | |
555 | error: | |
0fdd1e2c | 556 | return -1; |
fac6795d DG |
557 | } |
558 | ||
e065084a | 559 | /* |
d063d709 DG |
560 | * Setup the outgoing data buffer for the response (llm) by allocating the |
561 | * right amount of memory and copying the original information from the lsm | |
562 | * structure. | |
ca95a216 | 563 | * |
6e10c9b9 | 564 | * Return 0 on success, negative value on error. |
ca95a216 | 565 | */ |
6e10c9b9 PP |
566 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
567 | const void *payload_buf, size_t payload_len, | |
568 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 569 | { |
6e10c9b9 PP |
570 | int ret = 0; |
571 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
572 | const size_t cmd_header_offset = header_len; | |
573 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
574 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 575 | |
6e10c9b9 | 576 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 577 | |
5461b305 | 578 | if (cmd_ctx->llm == NULL) { |
76d7553f | 579 | PERROR("zmalloc"); |
5461b305 | 580 | ret = -ENOMEM; |
6e10c9b9 | 581 | goto end; |
ca95a216 DG |
582 | } |
583 | ||
5461b305 DG |
584 | /* Copy common data */ |
585 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 586 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
587 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
588 | cmd_ctx->llm->data_size = payload_len; | |
589 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 590 | |
6e10c9b9 | 591 | /* Copy command header */ |
b4e3ceb9 PP |
592 | if (cmd_header_len) { |
593 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
594 | cmd_header_len); | |
595 | } | |
5461b305 | 596 | |
6e10c9b9 | 597 | /* Copy payload */ |
b4e3ceb9 PP |
598 | if (payload_len) { |
599 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
600 | payload_len); | |
601 | } | |
ca95a216 | 602 | |
6e10c9b9 | 603 | end: |
ca95a216 DG |
604 | return ret; |
605 | } | |
606 | ||
6e10c9b9 PP |
607 | /* |
608 | * Version of setup_lttng_msg() without command header. | |
609 | */ | |
610 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
611 | void *payload_buf, size_t payload_len) | |
612 | { | |
613 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
614 | } | |
7a485870 | 615 | /* |
5eb91c98 | 616 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 617 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 618 | */ |
5eb91c98 | 619 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 620 | { |
5eb91c98 | 621 | int ret; |
7a485870 DG |
622 | struct ltt_session *session; |
623 | struct ltt_kernel_channel *channel; | |
624 | ||
5eb91c98 | 625 | DBG("Updating kernel poll set"); |
7a485870 | 626 | |
54d01ffb | 627 | session_lock_list(); |
b5541356 | 628 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 629 | session_lock(session); |
7a485870 | 630 | if (session->kernel_session == NULL) { |
54d01ffb | 631 | session_unlock(session); |
7a485870 DG |
632 | continue; |
633 | } | |
7a485870 | 634 | |
54d01ffb DG |
635 | cds_list_for_each_entry(channel, |
636 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
637 | /* Add channel fd to the kernel poll set */ |
638 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
639 | if (ret < 0) { | |
54d01ffb | 640 | session_unlock(session); |
5eb91c98 DG |
641 | goto error; |
642 | } | |
643 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 644 | } |
54d01ffb | 645 | session_unlock(session); |
7a485870 | 646 | } |
54d01ffb | 647 | session_unlock_list(); |
7a485870 | 648 | |
5eb91c98 | 649 | return 0; |
7a485870 DG |
650 | |
651 | error: | |
54d01ffb | 652 | session_unlock_list(); |
7a485870 DG |
653 | return -1; |
654 | } | |
655 | ||
656 | /* | |
54d01ffb | 657 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 658 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 659 | * |
d063d709 | 660 | * Useful for CPU hotplug feature. |
7a485870 | 661 | */ |
7f032058 | 662 | static int update_kernel_stream(int fd) |
7a485870 DG |
663 | { |
664 | int ret = 0; | |
665 | struct ltt_session *session; | |
173af62f | 666 | struct ltt_kernel_session *ksess; |
7a485870 DG |
667 | struct ltt_kernel_channel *channel; |
668 | ||
669 | DBG("Updating kernel streams for channel fd %d", fd); | |
670 | ||
54d01ffb | 671 | session_lock_list(); |
b5541356 | 672 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 673 | session_lock(session); |
7a485870 | 674 | if (session->kernel_session == NULL) { |
54d01ffb | 675 | session_unlock(session); |
7a485870 DG |
676 | continue; |
677 | } | |
173af62f | 678 | ksess = session->kernel_session; |
d9800920 | 679 | |
4a15001e MD |
680 | cds_list_for_each_entry(channel, |
681 | &ksess->channel_list.head, list) { | |
682 | struct lttng_ht_iter iter; | |
683 | struct consumer_socket *socket; | |
d9800920 | 684 | |
4a15001e MD |
685 | if (channel->fd != fd) { |
686 | continue; | |
687 | } | |
688 | DBG("Channel found, updating kernel streams"); | |
689 | ret = kernel_open_channel_stream(channel); | |
690 | if (ret < 0) { | |
691 | goto error; | |
692 | } | |
693 | /* Update the stream global counter */ | |
694 | ksess->stream_count_global += ret; | |
695 | ||
696 | /* | |
697 | * Have we already sent fds to the consumer? If yes, it | |
698 | * means that tracing is started so it is safe to send | |
699 | * our updated stream fds. | |
700 | */ | |
701 | if (ksess->consumer_fds_sent != 1 | |
702 | || ksess->consumer == NULL) { | |
703 | ret = -1; | |
704 | goto error; | |
705 | } | |
706 | ||
707 | rcu_read_lock(); | |
708 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
709 | &iter.iter, socket, node.node) { | |
710 | pthread_mutex_lock(socket->lock); | |
1fc1b7c8 | 711 | ret = kernel_consumer_send_channel_streams(socket, |
4a15001e MD |
712 | channel, ksess, |
713 | session->output_traces ? 1 : 0); | |
714 | pthread_mutex_unlock(socket->lock); | |
715 | if (ret < 0) { | |
e7fe706f | 716 | rcu_read_unlock(); |
4a15001e | 717 | goto error; |
7a485870 | 718 | } |
7a485870 | 719 | } |
4a15001e | 720 | rcu_read_unlock(); |
7a485870 | 721 | } |
54d01ffb | 722 | session_unlock(session); |
7a485870 | 723 | } |
54d01ffb | 724 | session_unlock_list(); |
b3c750d2 | 725 | return ret; |
7a485870 | 726 | |
b3c750d2 | 727 | error: |
54d01ffb DG |
728 | session_unlock(session); |
729 | session_unlock_list(); | |
7a485870 DG |
730 | return ret; |
731 | } | |
732 | ||
487cf67c | 733 | /* |
ffe60014 DG |
734 | * For each tracing session, update newly registered apps. The session list |
735 | * lock MUST be acquired before calling this. | |
487cf67c DG |
736 | */ |
737 | static void update_ust_app(int app_sock) | |
738 | { | |
739 | struct ltt_session *sess, *stmp; | |
740 | ||
fdadac08 DG |
741 | /* Consumer is in an ERROR state. Stop any application update. */ |
742 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
743 | /* Stop the update process since the consumer is dead. */ | |
744 | return; | |
745 | } | |
746 | ||
487cf67c DG |
747 | /* For all tracing session(s) */ |
748 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
749 | struct ust_app *app; |
750 | ||
4ee14516 | 751 | session_lock(sess); |
a9ad0c8f MD |
752 | if (!sess->ust_session) { |
753 | goto unlock_session; | |
754 | } | |
755 | ||
756 | rcu_read_lock(); | |
757 | assert(app_sock >= 0); | |
758 | app = ust_app_find_by_sock(app_sock); | |
759 | if (app == NULL) { | |
760 | /* | |
761 | * Application can be unregistered before so | |
762 | * this is possible hence simply stopping the | |
763 | * update. | |
764 | */ | |
765 | DBG3("UST app update failed to find app sock %d", | |
766 | app_sock); | |
767 | goto unlock_rcu; | |
421cb601 | 768 | } |
a9ad0c8f MD |
769 | ust_app_global_update(sess->ust_session, app); |
770 | unlock_rcu: | |
771 | rcu_read_unlock(); | |
772 | unlock_session: | |
4ee14516 | 773 | session_unlock(sess); |
487cf67c DG |
774 | } |
775 | } | |
776 | ||
7a485870 | 777 | /* |
d063d709 | 778 | * This thread manage event coming from the kernel. |
7a485870 | 779 | * |
d063d709 DG |
780 | * Features supported in this thread: |
781 | * -) CPU Hotplug | |
7a485870 DG |
782 | */ |
783 | static void *thread_manage_kernel(void *data) | |
784 | { | |
139ac872 | 785 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 786 | uint32_t revents, nb_fd; |
7a485870 | 787 | char tmp; |
5eb91c98 | 788 | struct lttng_poll_event events; |
7a485870 | 789 | |
6993eeb3 | 790 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 791 | |
6c71277b | 792 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 793 | |
d5d63bf1 DG |
794 | /* |
795 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 796 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 797 | */ |
6d737ce4 | 798 | lttng_poll_init(&events); |
d5d63bf1 | 799 | |
e547b070 | 800 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
801 | goto error_testpoint; |
802 | } | |
8ac94142 | 803 | |
840cb59c | 804 | health_code_update(); |
44a5e5eb | 805 | |
e547b070 | 806 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 807 | goto error_testpoint; |
6993eeb3 CB |
808 | } |
809 | ||
7a485870 | 810 | while (1) { |
840cb59c | 811 | health_code_update(); |
44a5e5eb | 812 | |
7a485870 | 813 | if (update_poll_flag == 1) { |
d21b0d71 DG |
814 | /* Clean events object. We are about to populate it again. */ |
815 | lttng_poll_clean(&events); | |
816 | ||
d0b96690 | 817 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
818 | if (ret < 0) { |
819 | goto error_poll_create; | |
820 | } | |
821 | ||
822 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
823 | if (ret < 0) { | |
824 | goto error; | |
825 | } | |
5f822d0a | 826 | |
d21b0d71 | 827 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
828 | ret = update_kernel_poll(&events); |
829 | if (ret < 0) { | |
7a485870 DG |
830 | goto error; |
831 | } | |
832 | update_poll_flag = 0; | |
833 | } | |
834 | ||
7fa2082e | 835 | DBG("Thread kernel polling"); |
7a485870 DG |
836 | |
837 | /* Poll infinite value of time */ | |
88f2b785 | 838 | restart: |
a78af745 | 839 | health_poll_entry(); |
5eb91c98 | 840 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
841 | DBG("Thread kernel return from poll on %d fds", |
842 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 843 | health_poll_exit(); |
7a485870 | 844 | if (ret < 0) { |
88f2b785 MD |
845 | /* |
846 | * Restart interrupted system call. | |
847 | */ | |
848 | if (errno == EINTR) { | |
849 | goto restart; | |
850 | } | |
7a485870 DG |
851 | goto error; |
852 | } else if (ret == 0) { | |
853 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
854 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
855 | "This should not have happened! Continuing..."); | |
7a485870 DG |
856 | continue; |
857 | } | |
858 | ||
0d9c5d77 DG |
859 | nb_fd = ret; |
860 | ||
5eb91c98 DG |
861 | for (i = 0; i < nb_fd; i++) { |
862 | /* Fetch once the poll data */ | |
863 | revents = LTTNG_POLL_GETEV(&events, i); | |
864 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 865 | |
840cb59c | 866 | health_code_update(); |
44a5e5eb | 867 | |
fd20dac9 MD |
868 | if (!revents) { |
869 | /* No activity for this FD (poll implementation). */ | |
870 | continue; | |
871 | } | |
872 | ||
5eb91c98 | 873 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 874 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 875 | if (ret) { |
139ac872 MD |
876 | err = 0; |
877 | goto exit; | |
5eb91c98 | 878 | } |
7a485870 | 879 | |
5eb91c98 | 880 | /* Check for data on kernel pipe */ |
03e43155 MD |
881 | if (revents & LPOLLIN) { |
882 | if (pollfd == kernel_poll_pipe[0]) { | |
883 | (void) lttng_read(kernel_poll_pipe[0], | |
884 | &tmp, 1); | |
885 | /* | |
886 | * Ret value is useless here, if this pipe gets any actions an | |
887 | * update is required anyway. | |
888 | */ | |
889 | update_poll_flag = 1; | |
890 | continue; | |
891 | } else { | |
892 | /* | |
893 | * New CPU detected by the kernel. Adding kernel stream to | |
894 | * kernel session and updating the kernel consumer | |
895 | */ | |
7f032058 | 896 | ret = update_kernel_stream(pollfd); |
5eb91c98 DG |
897 | if (ret < 0) { |
898 | continue; | |
899 | } | |
900 | break; | |
7a485870 | 901 | } |
03e43155 MD |
902 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
903 | update_poll_flag = 1; | |
904 | continue; | |
905 | } else { | |
906 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
907 | goto error; | |
7a485870 DG |
908 | } |
909 | } | |
910 | } | |
911 | ||
139ac872 | 912 | exit: |
7a485870 | 913 | error: |
5eb91c98 | 914 | lttng_poll_clean(&events); |
76d7553f | 915 | error_poll_create: |
6993eeb3 | 916 | error_testpoint: |
6620da75 DG |
917 | utils_close_pipe(kernel_poll_pipe); |
918 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 919 | if (err) { |
840cb59c | 920 | health_error(); |
139ac872 | 921 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
922 | WARN("Kernel thread died unexpectedly. " |
923 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 924 | } |
8782cc74 | 925 | health_unregister(health_sessiond); |
76d7553f | 926 | DBG("Kernel thread dying"); |
7a485870 DG |
927 | return NULL; |
928 | } | |
929 | ||
a23ec3a7 DG |
930 | /* |
931 | * Signal pthread condition of the consumer data that the thread. | |
932 | */ | |
933 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
934 | { | |
935 | pthread_mutex_lock(&data->cond_mutex); | |
936 | ||
937 | /* | |
938 | * The state is set before signaling. It can be any value, it's the waiter | |
939 | * job to correctly interpret this condition variable associated to the | |
940 | * consumer pthread_cond. | |
941 | * | |
942 | * A value of 0 means that the corresponding thread of the consumer data | |
943 | * was not started. 1 indicates that the thread has started and is ready | |
944 | * for action. A negative value means that there was an error during the | |
945 | * thread bootstrap. | |
946 | */ | |
947 | data->consumer_thread_is_ready = state; | |
948 | (void) pthread_cond_signal(&data->cond); | |
949 | ||
950 | pthread_mutex_unlock(&data->cond_mutex); | |
951 | } | |
952 | ||
1d4b027a | 953 | /* |
3bd1e081 | 954 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 955 | */ |
3bd1e081 | 956 | static void *thread_manage_consumer(void *data) |
1d4b027a | 957 | { |
42fc1d0b | 958 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 959 | uint32_t revents, nb_fd; |
1d4b027a | 960 | enum lttcomm_return_code code; |
5eb91c98 | 961 | struct lttng_poll_event events; |
3bd1e081 | 962 | struct consumer_data *consumer_data = data; |
b3530820 | 963 | struct consumer_socket *cmd_socket_wrapper = NULL; |
1d4b027a | 964 | |
3bd1e081 | 965 | DBG("[thread] Manage consumer started"); |
1d4b027a | 966 | |
34c1e15a MD |
967 | rcu_register_thread(); |
968 | rcu_thread_online(); | |
969 | ||
6c71277b | 970 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 971 | |
855060f8 | 972 | health_code_update(); |
9449cc75 | 973 | |
5eb91c98 | 974 | /* |
331744e3 JD |
975 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
976 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 977 | */ |
331744e3 | 978 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 979 | if (ret < 0) { |
76d7553f | 980 | goto error_poll; |
5eb91c98 | 981 | } |
273ea72c | 982 | |
edb8b045 DG |
983 | /* |
984 | * The error socket here is already in a listening state which was done | |
985 | * just before spawning this thread to avoid a race between the consumer | |
986 | * daemon exec trying to connect and the listen() call. | |
987 | */ | |
3bd1e081 | 988 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
989 | if (ret < 0) { |
990 | goto error; | |
991 | } | |
992 | ||
840cb59c | 993 | health_code_update(); |
44a5e5eb | 994 | |
331744e3 | 995 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 996 | restart: |
a78af745 | 997 | health_poll_entry(); |
8ac94142 | 998 | |
e547b070 | 999 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1000 | goto error; |
1001 | } | |
8ac94142 | 1002 | |
5eb91c98 | 1003 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1004 | health_poll_exit(); |
273ea72c | 1005 | if (ret < 0) { |
88f2b785 MD |
1006 | /* |
1007 | * Restart interrupted system call. | |
1008 | */ | |
1009 | if (errno == EINTR) { | |
1010 | goto restart; | |
1011 | } | |
273ea72c DG |
1012 | goto error; |
1013 | } | |
1014 | ||
0d9c5d77 DG |
1015 | nb_fd = ret; |
1016 | ||
5eb91c98 DG |
1017 | for (i = 0; i < nb_fd; i++) { |
1018 | /* Fetch once the poll data */ | |
1019 | revents = LTTNG_POLL_GETEV(&events, i); | |
1020 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1021 | ||
840cb59c | 1022 | health_code_update(); |
44a5e5eb | 1023 | |
fd20dac9 MD |
1024 | if (!revents) { |
1025 | /* No activity for this FD (poll implementation). */ | |
1026 | continue; | |
1027 | } | |
1028 | ||
5eb91c98 | 1029 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1030 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1031 | if (ret) { |
139ac872 MD |
1032 | err = 0; |
1033 | goto exit; | |
5eb91c98 DG |
1034 | } |
1035 | ||
1036 | /* Event on the registration socket */ | |
3bd1e081 | 1037 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1038 | if (revents & LPOLLIN) { |
1039 | continue; | |
1040 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1041 | ERR("consumer err socket poll error"); |
5eb91c98 | 1042 | goto error; |
03e43155 MD |
1043 | } else { |
1044 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1045 | goto error; | |
5eb91c98 DG |
1046 | } |
1047 | } | |
273ea72c DG |
1048 | } |
1049 | ||
3bd1e081 | 1050 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1051 | if (sock < 0) { |
1052 | goto error; | |
1053 | } | |
1054 | ||
b662582b DG |
1055 | /* |
1056 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1057 | * show must go on. | |
1058 | */ | |
1059 | (void) utils_set_fd_cloexec(sock); | |
1060 | ||
840cb59c | 1061 | health_code_update(); |
44a5e5eb | 1062 | |
3bd1e081 | 1063 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1064 | |
712ea556 | 1065 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1066 | ret = lttcomm_recv_unix_sock(sock, &code, |
1067 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1068 | if (ret <= 0) { |
1069 | goto error; | |
1070 | } | |
1071 | ||
840cb59c | 1072 | health_code_update(); |
b3530820 | 1073 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 | 1074 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1075 | lttcomm_get_readable_code(-code)); |
1076 | goto error; | |
1077 | } | |
1078 | ||
b3530820 JG |
1079 | /* Connect both command and metadata sockets. */ |
1080 | consumer_data->cmd_sock = | |
1081 | lttcomm_connect_unix_sock( | |
1082 | consumer_data->cmd_unix_sock_path); | |
1083 | consumer_data->metadata_fd = | |
1084 | lttcomm_connect_unix_sock( | |
1085 | consumer_data->cmd_unix_sock_path); | |
1086 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
1087 | PERROR("consumer connect cmd socket"); | |
1088 | /* On error, signal condition and quit. */ | |
1089 | signal_consumer_condition(consumer_data, -1); | |
1090 | goto error; | |
1091 | } | |
1092 | ||
1093 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
1094 | ||
1095 | /* Create metadata socket lock. */ | |
1096 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1097 | if (consumer_data->metadata_sock.lock == NULL) { | |
1098 | PERROR("zmalloc pthread mutex"); | |
1099 | goto error; | |
1100 | } | |
1101 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1102 | ||
1103 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); | |
1104 | DBG("Consumer metadata socket ready (fd: %d)", | |
1105 | consumer_data->metadata_fd); | |
1106 | ||
1107 | /* | |
1108 | * Remove the consumerd error sock since we've established a connection. | |
1109 | */ | |
3bd1e081 | 1110 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1111 | if (ret < 0) { |
72079cae DG |
1112 | goto error; |
1113 | } | |
1114 | ||
331744e3 | 1115 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1116 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1117 | if (ret < 0) { | |
72079cae | 1118 | goto error; |
5eb91c98 DG |
1119 | } |
1120 | ||
331744e3 | 1121 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1122 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1123 | LPOLLIN | LPOLLRDHUP); |
1124 | if (ret < 0) { | |
1125 | goto error; | |
1126 | } | |
1127 | ||
840cb59c | 1128 | health_code_update(); |
44a5e5eb | 1129 | |
b3530820 | 1130 | /* |
62c43103 | 1131 | * Transfer the write-end of the channel monitoring and rotate pipe |
92816cc3 | 1132 | * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command. |
b3530820 JG |
1133 | */ |
1134 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
1135 | if (!cmd_socket_wrapper) { | |
1136 | goto error; | |
1137 | } | |
3e4dc117 | 1138 | cmd_socket_wrapper->lock = &consumer_data->lock; |
b3530820 JG |
1139 | |
1140 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, | |
1141 | consumer_data->channel_monitor_pipe); | |
1142 | if (ret) { | |
1143 | goto error; | |
1144 | } | |
62c43103 | 1145 | |
b3530820 JG |
1146 | /* Discard the socket wrapper as it is no longer needed. */ |
1147 | consumer_destroy_socket(cmd_socket_wrapper); | |
1148 | cmd_socket_wrapper = NULL; | |
1149 | ||
1150 | /* The thread is completely initialized, signal that it is ready. */ | |
1151 | signal_consumer_condition(consumer_data, 1); | |
1152 | ||
331744e3 | 1153 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1154 | restart_poll: |
331744e3 | 1155 | while (1) { |
42fc1d0b DG |
1156 | health_code_update(); |
1157 | ||
1158 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1159 | if (should_quit) { | |
1160 | /* Not a health error. */ | |
1161 | err = 0; | |
1162 | goto exit; | |
1163 | } | |
1164 | ||
331744e3 JD |
1165 | health_poll_entry(); |
1166 | ret = lttng_poll_wait(&events, -1); | |
1167 | health_poll_exit(); | |
1168 | if (ret < 0) { | |
1169 | /* | |
1170 | * Restart interrupted system call. | |
1171 | */ | |
1172 | if (errno == EINTR) { | |
1173 | goto restart_poll; | |
1174 | } | |
1175 | goto error; | |
88f2b785 | 1176 | } |
72079cae | 1177 | |
331744e3 | 1178 | nb_fd = ret; |
0d9c5d77 | 1179 | |
331744e3 JD |
1180 | for (i = 0; i < nb_fd; i++) { |
1181 | /* Fetch once the poll data */ | |
1182 | revents = LTTNG_POLL_GETEV(&events, i); | |
1183 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1184 | |
331744e3 | 1185 | health_code_update(); |
44a5e5eb | 1186 | |
fd20dac9 MD |
1187 | if (!revents) { |
1188 | /* No activity for this FD (poll implementation). */ | |
1189 | continue; | |
1190 | } | |
1191 | ||
42fc1d0b DG |
1192 | /* |
1193 | * Thread quit pipe has been triggered, flag that we should stop | |
1194 | * but continue the current loop to handle potential data from | |
1195 | * consumer. | |
1196 | */ | |
1197 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1198 | |
331744e3 JD |
1199 | if (pollfd == sock) { |
1200 | /* Event on the consumerd socket */ | |
03e43155 MD |
1201 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1202 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1203 | ERR("consumer err socket second poll error"); |
1204 | goto error; | |
1205 | } | |
1206 | health_code_update(); | |
1207 | /* Wait for any kconsumerd error */ | |
1208 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1209 | sizeof(enum lttcomm_return_code)); | |
1210 | if (ret <= 0) { | |
1211 | ERR("consumer closed the command socket"); | |
1212 | goto error; | |
1213 | } | |
1214 | ||
1215 | ERR("consumer return code : %s", | |
1216 | lttcomm_get_readable_code(-code)); | |
1217 | ||
1218 | goto exit; | |
4ce514c4 | 1219 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1220 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1221 | && !(revents & LPOLLIN)) { | |
1222 | ERR("consumer err metadata socket second poll error"); | |
1223 | goto error; | |
1224 | } | |
331744e3 JD |
1225 | /* UST metadata requests */ |
1226 | ret = ust_consumer_metadata_request( | |
1227 | &consumer_data->metadata_sock); | |
1228 | if (ret < 0) { | |
1229 | ERR("Handling metadata request"); | |
1230 | goto error; | |
1231 | } | |
5eb91c98 | 1232 | } |
42fc1d0b | 1233 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1234 | } |
331744e3 | 1235 | health_code_update(); |
5eb91c98 DG |
1236 | } |
1237 | ||
139ac872 | 1238 | exit: |
1d4b027a | 1239 | error: |
fdadac08 DG |
1240 | /* |
1241 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1242 | * thread might be using them so get exclusive access which will abort all |
1243 | * other consumer command by other threads. | |
fdadac08 DG |
1244 | */ |
1245 | pthread_mutex_lock(&consumer_data->lock); | |
1246 | ||
5c827ce0 DG |
1247 | /* Immediately set the consumerd state to stopped */ |
1248 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1249 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1250 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1251 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1252 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1253 | } else { | |
1254 | /* Code flow error... */ | |
1255 | assert(0); | |
1256 | } | |
1257 | ||
76d7553f MD |
1258 | if (consumer_data->err_sock >= 0) { |
1259 | ret = close(consumer_data->err_sock); | |
1260 | if (ret) { | |
1261 | PERROR("close"); | |
1262 | } | |
a76cbd9f | 1263 | consumer_data->err_sock = -1; |
76d7553f MD |
1264 | } |
1265 | if (consumer_data->cmd_sock >= 0) { | |
1266 | ret = close(consumer_data->cmd_sock); | |
1267 | if (ret) { | |
1268 | PERROR("close"); | |
1269 | } | |
a76cbd9f | 1270 | consumer_data->cmd_sock = -1; |
76d7553f | 1271 | } |
96544455 SS |
1272 | if (consumer_data->metadata_sock.fd_ptr && |
1273 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1274 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1275 | if (ret) { |
1276 | PERROR("close"); | |
1277 | } | |
1278 | } | |
76d7553f MD |
1279 | if (sock >= 0) { |
1280 | ret = close(sock); | |
1281 | if (ret) { | |
1282 | PERROR("close"); | |
1283 | } | |
1284 | } | |
273ea72c | 1285 | |
3bd1e081 MD |
1286 | unlink(consumer_data->err_unix_sock_path); |
1287 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1288 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1289 | |
fdadac08 | 1290 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1291 | if (consumer_data->metadata_sock.lock) { |
1292 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1293 | free(consumer_data->metadata_sock.lock); | |
1294 | } | |
5eb91c98 | 1295 | lttng_poll_clean(&events); |
b3530820 JG |
1296 | |
1297 | if (cmd_socket_wrapper) { | |
1298 | consumer_destroy_socket(cmd_socket_wrapper); | |
1299 | } | |
76d7553f | 1300 | error_poll: |
139ac872 | 1301 | if (err) { |
840cb59c | 1302 | health_error(); |
139ac872 MD |
1303 | ERR("Health error occurred in %s", __func__); |
1304 | } | |
8782cc74 | 1305 | health_unregister(health_sessiond); |
76d7553f | 1306 | DBG("consumer thread cleanup completed"); |
0177d773 | 1307 | |
34c1e15a MD |
1308 | rcu_thread_offline(); |
1309 | rcu_unregister_thread(); | |
1310 | ||
5eb91c98 | 1311 | return NULL; |
099e26bd DG |
1312 | } |
1313 | ||
099e26bd | 1314 | /* |
81f04d5f JG |
1315 | * This thread receives application command sockets (FDs) on the |
1316 | * apps_cmd_pipe and waits (polls) on them until they are closed | |
1317 | * or an error occurs. | |
1318 | * | |
1319 | * At that point, it flushes the data (tracing and metadata) associated | |
1320 | * with this application and tears down ust app sessions and other | |
1321 | * associated data structures through ust_app_unregister(). | |
1322 | * | |
1323 | * Note that this thread never sends commands to the applications | |
1324 | * through the command sockets; it merely listens for hang-ups | |
1325 | * and errors on those sockets and cleans-up as they occur. | |
1d4b027a DG |
1326 | */ |
1327 | static void *thread_manage_apps(void *data) | |
099e26bd | 1328 | { |
139ac872 | 1329 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1330 | ssize_t size_ret; |
5eb91c98 | 1331 | uint32_t revents, nb_fd; |
5eb91c98 | 1332 | struct lttng_poll_event events; |
099e26bd DG |
1333 | |
1334 | DBG("[thread] Manage application started"); | |
1335 | ||
f6a9efaa DG |
1336 | rcu_register_thread(); |
1337 | rcu_thread_online(); | |
1338 | ||
6c71277b | 1339 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1340 | |
e547b070 | 1341 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1342 | goto error_testpoint; |
1343 | } | |
1344 | ||
840cb59c | 1345 | health_code_update(); |
44a5e5eb | 1346 | |
d0b96690 | 1347 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1348 | if (ret < 0) { |
76d7553f | 1349 | goto error_poll_create; |
5eb91c98 | 1350 | } |
099e26bd | 1351 | |
5eb91c98 DG |
1352 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1353 | if (ret < 0) { | |
1354 | goto error; | |
1355 | } | |
099e26bd | 1356 | |
e547b070 | 1357 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1358 | goto error; |
1359 | } | |
8ac94142 | 1360 | |
840cb59c | 1361 | health_code_update(); |
44a5e5eb | 1362 | |
5eb91c98 | 1363 | while (1) { |
7fa2082e | 1364 | DBG("Apps thread polling"); |
099e26bd DG |
1365 | |
1366 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1367 | restart: |
a78af745 | 1368 | health_poll_entry(); |
5eb91c98 | 1369 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1370 | DBG("Apps thread return from poll on %d fds", |
1371 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1372 | health_poll_exit(); |
099e26bd | 1373 | if (ret < 0) { |
88f2b785 MD |
1374 | /* |
1375 | * Restart interrupted system call. | |
1376 | */ | |
1377 | if (errno == EINTR) { | |
1378 | goto restart; | |
1379 | } | |
099e26bd DG |
1380 | goto error; |
1381 | } | |
1382 | ||
0d9c5d77 DG |
1383 | nb_fd = ret; |
1384 | ||
5eb91c98 DG |
1385 | for (i = 0; i < nb_fd; i++) { |
1386 | /* Fetch once the poll data */ | |
1387 | revents = LTTNG_POLL_GETEV(&events, i); | |
1388 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1389 | ||
840cb59c | 1390 | health_code_update(); |
44a5e5eb | 1391 | |
fd20dac9 MD |
1392 | if (!revents) { |
1393 | /* No activity for this FD (poll implementation). */ | |
1394 | continue; | |
1395 | } | |
1396 | ||
5eb91c98 | 1397 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1398 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1399 | if (ret) { |
139ac872 MD |
1400 | err = 0; |
1401 | goto exit; | |
5eb91c98 | 1402 | } |
099e26bd | 1403 | |
5eb91c98 DG |
1404 | /* Inspect the apps cmd pipe */ |
1405 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1406 | if (revents & LPOLLIN) { |
d0b96690 DG |
1407 | int sock; |
1408 | ||
5eb91c98 | 1409 | /* Empty pipe */ |
6cd525e8 MD |
1410 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1411 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1412 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1413 | goto error; |
1414 | } | |
099e26bd | 1415 | |
840cb59c | 1416 | health_code_update(); |
44a5e5eb | 1417 | |
ffe60014 | 1418 | /* |
03e43155 MD |
1419 | * Since this is a command socket (write then read), |
1420 | * we only monitor the error events of the socket. | |
ffe60014 | 1421 | */ |
d0b96690 DG |
1422 | ret = lttng_poll_add(&events, sock, |
1423 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1424 | if (ret < 0) { | |
5eb91c98 | 1425 | goto error; |
e0c7ec2b | 1426 | } |
acc7b41b | 1427 | |
d0b96690 | 1428 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1429 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1430 | ERR("Apps command pipe error"); | |
1431 | goto error; | |
1432 | } else { | |
1433 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1434 | goto error; | |
0177d773 | 1435 | } |
5eb91c98 DG |
1436 | } else { |
1437 | /* | |
54d01ffb DG |
1438 | * At this point, we know that a registered application made |
1439 | * the event at poll_wait. | |
5eb91c98 DG |
1440 | */ |
1441 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1442 | /* Removing from the poll set */ | |
1443 | ret = lttng_poll_del(&events, pollfd); | |
1444 | if (ret < 0) { | |
1445 | goto error; | |
1446 | } | |
099e26bd | 1447 | |
b9d9b220 | 1448 | /* Socket closed on remote end. */ |
56fff090 | 1449 | ust_app_unregister(pollfd); |
03e43155 MD |
1450 | } else { |
1451 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1452 | goto error; | |
5eb91c98 | 1453 | } |
099e26bd | 1454 | } |
44a5e5eb | 1455 | |
840cb59c | 1456 | health_code_update(); |
099e26bd | 1457 | } |
099e26bd DG |
1458 | } |
1459 | ||
139ac872 | 1460 | exit: |
099e26bd | 1461 | error: |
5eb91c98 | 1462 | lttng_poll_clean(&events); |
76d7553f | 1463 | error_poll_create: |
6993eeb3 | 1464 | error_testpoint: |
6620da75 DG |
1465 | utils_close_pipe(apps_cmd_pipe); |
1466 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1467 | ||
1468 | /* | |
1469 | * We don't clean the UST app hash table here since already registered | |
1470 | * applications can still be controlled so let them be until the session | |
1471 | * daemon dies or the applications stop. | |
1472 | */ | |
1473 | ||
139ac872 | 1474 | if (err) { |
840cb59c | 1475 | health_error(); |
139ac872 MD |
1476 | ERR("Health error occurred in %s", __func__); |
1477 | } | |
8782cc74 | 1478 | health_unregister(health_sessiond); |
76d7553f | 1479 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1480 | rcu_thread_offline(); |
1481 | rcu_unregister_thread(); | |
099e26bd DG |
1482 | return NULL; |
1483 | } | |
1484 | ||
d0b96690 | 1485 | /* |
d88aee68 DG |
1486 | * Send a socket to a thread This is called from the dispatch UST registration |
1487 | * thread once all sockets are set for the application. | |
d0b96690 | 1488 | * |
b85dc84c DG |
1489 | * The sock value can be invalid, we don't really care, the thread will handle |
1490 | * it and make the necessary cleanup if so. | |
1491 | * | |
d0b96690 DG |
1492 | * On success, return 0 else a negative value being the errno message of the |
1493 | * write(). | |
1494 | */ | |
d88aee68 | 1495 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1496 | { |
6cd525e8 | 1497 | ssize_t ret; |
d0b96690 | 1498 | |
b85dc84c DG |
1499 | /* |
1500 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1501 | * before calling this function being a shutdown state of the thread. | |
1502 | */ | |
1503 | if (fd < 0) { | |
1504 | ret = -EBADF; | |
1505 | goto error; | |
1506 | } | |
d0b96690 | 1507 | |
6cd525e8 MD |
1508 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1509 | if (ret < sizeof(sock)) { | |
d88aee68 | 1510 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1511 | if (ret < 0) { |
1512 | ret = -errno; | |
1513 | } | |
1514 | goto error; | |
1515 | } | |
1516 | ||
1517 | /* All good. Don't send back the write positive ret value. */ | |
1518 | ret = 0; | |
1519 | error: | |
6cd525e8 | 1520 | return (int) ret; |
d0b96690 DG |
1521 | } |
1522 | ||
f45e313d DG |
1523 | /* |
1524 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1525 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1526 | * notify socket is never received. | |
1527 | */ | |
1528 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1529 | { | |
1530 | int ret, nb_fd = 0, i; | |
1531 | unsigned int fd_added = 0; | |
1532 | struct lttng_poll_event events; | |
1533 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1534 | ||
1535 | assert(wait_queue); | |
1536 | ||
1537 | lttng_poll_init(&events); | |
1538 | ||
1539 | /* Just skip everything for an empty queue. */ | |
1540 | if (!wait_queue->count) { | |
1541 | goto end; | |
1542 | } | |
1543 | ||
1544 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1545 | if (ret < 0) { | |
1546 | goto error_create; | |
1547 | } | |
1548 | ||
1549 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1550 | &wait_queue->head, head) { | |
1551 | assert(wait_node->app); | |
1552 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1553 | LPOLLHUP | LPOLLERR); | |
1554 | if (ret < 0) { | |
1555 | goto error; | |
1556 | } | |
1557 | ||
1558 | fd_added = 1; | |
1559 | } | |
1560 | ||
1561 | if (!fd_added) { | |
1562 | goto end; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * Poll but don't block so we can quickly identify the faulty events and | |
1567 | * clean them afterwards from the wait queue. | |
1568 | */ | |
1569 | ret = lttng_poll_wait(&events, 0); | |
1570 | if (ret < 0) { | |
1571 | goto error; | |
1572 | } | |
1573 | nb_fd = ret; | |
1574 | ||
1575 | for (i = 0; i < nb_fd; i++) { | |
1576 | /* Get faulty FD. */ | |
1577 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1578 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1579 | ||
fd20dac9 MD |
1580 | if (!revents) { |
1581 | /* No activity for this FD (poll implementation). */ | |
1582 | continue; | |
1583 | } | |
1584 | ||
f45e313d DG |
1585 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1586 | &wait_queue->head, head) { | |
1587 | if (pollfd == wait_node->app->sock && | |
1588 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1589 | cds_list_del(&wait_node->head); | |
1590 | wait_queue->count--; | |
1591 | ust_app_destroy(wait_node->app); | |
1592 | free(wait_node); | |
48b40bcf JG |
1593 | /* |
1594 | * Silence warning of use-after-free in | |
1595 | * cds_list_for_each_entry_safe which uses | |
1596 | * __typeof__(*wait_node). | |
1597 | */ | |
1598 | wait_node = NULL; | |
f45e313d | 1599 | break; |
03e43155 MD |
1600 | } else { |
1601 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1602 | goto error; | |
f45e313d DG |
1603 | } |
1604 | } | |
1605 | } | |
1606 | ||
1607 | if (nb_fd > 0) { | |
1608 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1609 | } | |
1610 | ||
1611 | end: | |
1612 | lttng_poll_clean(&events); | |
1613 | return; | |
1614 | ||
1615 | error: | |
1616 | lttng_poll_clean(&events); | |
1617 | error_create: | |
1618 | ERR("Unable to sanitize wait queue"); | |
1619 | return; | |
1620 | } | |
1621 | ||
099e26bd DG |
1622 | /* |
1623 | * Dispatch request from the registration threads to the application | |
1624 | * communication thread. | |
1625 | */ | |
1626 | static void *thread_dispatch_ust_registration(void *data) | |
1627 | { | |
12e2b881 | 1628 | int ret, err = -1; |
8bdee6e2 | 1629 | struct cds_wfcq_node *node; |
099e26bd | 1630 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1631 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1632 | struct ust_reg_wait_queue wait_queue = { | |
1633 | .count = 0, | |
1634 | }; | |
d0b96690 | 1635 | |
967e3668 MD |
1636 | rcu_register_thread(); |
1637 | ||
6c71277b | 1638 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1639 | |
9ad42ec1 MD |
1640 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1641 | goto error_testpoint; | |
1642 | } | |
1643 | ||
12e2b881 MD |
1644 | health_code_update(); |
1645 | ||
f45e313d | 1646 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1647 | |
1648 | DBG("[thread] Dispatch UST command started"); | |
1649 | ||
0ed3b1a8 | 1650 | for (;;) { |
12e2b881 MD |
1651 | health_code_update(); |
1652 | ||
099e26bd DG |
1653 | /* Atomically prepare the queue futex */ |
1654 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1655 | ||
0ed3b1a8 MD |
1656 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1657 | break; | |
1658 | } | |
1659 | ||
099e26bd | 1660 | do { |
d0b96690 | 1661 | struct ust_app *app = NULL; |
7972aab2 | 1662 | ust_cmd = NULL; |
d0b96690 | 1663 | |
f45e313d DG |
1664 | /* |
1665 | * Make sure we don't have node(s) that have hung up before receiving | |
1666 | * the notify socket. This is to clean the list in order to avoid | |
1667 | * memory leaks from notify socket that are never seen. | |
1668 | */ | |
1669 | sanitize_wait_queue(&wait_queue); | |
1670 | ||
12e2b881 | 1671 | health_code_update(); |
099e26bd | 1672 | /* Dequeue command for registration */ |
8bdee6e2 | 1673 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1674 | if (node == NULL) { |
00a17c97 | 1675 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1676 | /* Continue thread execution */ |
1677 | break; | |
1678 | } | |
1679 | ||
1680 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1681 | ||
2f50c8a3 DG |
1682 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1683 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1684 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1685 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1686 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1687 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1688 | |
1689 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1690 | wait_node = zmalloc(sizeof(*wait_node)); | |
1691 | if (!wait_node) { | |
1692 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1693 | ret = close(ust_cmd->sock); |
1694 | if (ret < 0) { | |
1695 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1696 | } | |
51dec90d | 1697 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1698 | free(ust_cmd); |
d0b96690 DG |
1699 | goto error; |
1700 | } | |
1701 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1702 | ||
1703 | /* Create application object if socket is CMD. */ | |
1704 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1705 | ust_cmd->sock); | |
1706 | if (!wait_node->app) { | |
1707 | ret = close(ust_cmd->sock); | |
1708 | if (ret < 0) { | |
1709 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1710 | } |
51dec90d | 1711 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1712 | free(wait_node); |
7972aab2 | 1713 | free(ust_cmd); |
d0b96690 DG |
1714 | continue; |
1715 | } | |
1716 | /* | |
1717 | * Add application to the wait queue so we can set the notify | |
1718 | * socket before putting this object in the global ht. | |
1719 | */ | |
f45e313d DG |
1720 | cds_list_add(&wait_node->head, &wait_queue.head); |
1721 | wait_queue.count++; | |
d0b96690 | 1722 | |
7972aab2 | 1723 | free(ust_cmd); |
d0b96690 DG |
1724 | /* |
1725 | * We have to continue here since we don't have the notify | |
1726 | * socket and the application MUST be added to the hash table | |
1727 | * only at that moment. | |
1728 | */ | |
1729 | continue; | |
1730 | } else { | |
1731 | /* | |
1732 | * Look for the application in the local wait queue and set the | |
1733 | * notify socket if found. | |
1734 | */ | |
d88aee68 | 1735 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1736 | &wait_queue.head, head) { |
12e2b881 | 1737 | health_code_update(); |
d0b96690 DG |
1738 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1739 | wait_node->app->notify_sock = ust_cmd->sock; | |
1740 | cds_list_del(&wait_node->head); | |
f45e313d | 1741 | wait_queue.count--; |
d0b96690 DG |
1742 | app = wait_node->app; |
1743 | free(wait_node); | |
1744 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1745 | break; | |
1746 | } | |
1747 | } | |
020d7f60 DG |
1748 | |
1749 | /* | |
1750 | * With no application at this stage the received socket is | |
1751 | * basically useless so close it before we free the cmd data | |
1752 | * structure for good. | |
1753 | */ | |
1754 | if (!app) { | |
1755 | ret = close(ust_cmd->sock); | |
1756 | if (ret < 0) { | |
1757 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1758 | } | |
51dec90d | 1759 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1760 | } |
7972aab2 | 1761 | free(ust_cmd); |
d0b96690 DG |
1762 | } |
1763 | ||
1764 | if (app) { | |
d0b96690 DG |
1765 | /* |
1766 | * @session_lock_list | |
1767 | * | |
1768 | * Lock the global session list so from the register up to the | |
1769 | * registration done message, no thread can see the application | |
1770 | * and change its state. | |
1771 | */ | |
1772 | session_lock_list(); | |
1773 | rcu_read_lock(); | |
d88aee68 | 1774 | |
d0b96690 DG |
1775 | /* |
1776 | * Add application to the global hash table. This needs to be | |
1777 | * done before the update to the UST registry can locate the | |
1778 | * application. | |
1779 | */ | |
1780 | ust_app_add(app); | |
d88aee68 DG |
1781 | |
1782 | /* Set app version. This call will print an error if needed. */ | |
1783 | (void) ust_app_version(app); | |
1784 | ||
1785 | /* Send notify socket through the notify pipe. */ | |
1786 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1787 | app->notify_sock); | |
1788 | if (ret < 0) { | |
1789 | rcu_read_unlock(); | |
1790 | session_unlock_list(); | |
b85dc84c DG |
1791 | /* |
1792 | * No notify thread, stop the UST tracing. However, this is | |
1793 | * not an internal error of the this thread thus setting | |
1794 | * the health error code to a normal exit. | |
1795 | */ | |
1796 | err = 0; | |
d88aee68 | 1797 | goto error; |
6620da75 | 1798 | } |
d88aee68 | 1799 | |
d0b96690 DG |
1800 | /* |
1801 | * Update newly registered application with the tracing | |
1802 | * registry info already enabled information. | |
1803 | */ | |
1804 | update_ust_app(app->sock); | |
d88aee68 DG |
1805 | |
1806 | /* | |
1807 | * Don't care about return value. Let the manage apps threads | |
1808 | * handle app unregistration upon socket close. | |
1809 | */ | |
fb45065e | 1810 | (void) ust_app_register_done(app); |
d88aee68 DG |
1811 | |
1812 | /* | |
1813 | * Even if the application socket has been closed, send the app | |
1814 | * to the thread and unregistration will take place at that | |
1815 | * place. | |
1816 | */ | |
1817 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1818 | if (ret < 0) { |
d88aee68 DG |
1819 | rcu_read_unlock(); |
1820 | session_unlock_list(); | |
b85dc84c DG |
1821 | /* |
1822 | * No apps. thread, stop the UST tracing. However, this is | |
1823 | * not an internal error of the this thread thus setting | |
1824 | * the health error code to a normal exit. | |
1825 | */ | |
1826 | err = 0; | |
d88aee68 | 1827 | goto error; |
d0b96690 | 1828 | } |
d88aee68 | 1829 | |
d0b96690 DG |
1830 | rcu_read_unlock(); |
1831 | session_unlock_list(); | |
099e26bd | 1832 | } |
099e26bd DG |
1833 | } while (node != NULL); |
1834 | ||
12e2b881 | 1835 | health_poll_entry(); |
099e26bd DG |
1836 | /* Futex wait on queue. Blocking call on futex() */ |
1837 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1838 | health_poll_exit(); |
099e26bd | 1839 | } |
12e2b881 MD |
1840 | /* Normal exit, no error */ |
1841 | err = 0; | |
099e26bd DG |
1842 | |
1843 | error: | |
d88aee68 DG |
1844 | /* Clean up wait queue. */ |
1845 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1846 | &wait_queue.head, head) { |
d88aee68 | 1847 | cds_list_del(&wait_node->head); |
f45e313d | 1848 | wait_queue.count--; |
d88aee68 DG |
1849 | free(wait_node); |
1850 | } | |
1851 | ||
772b8f4d MD |
1852 | /* Empty command queue. */ |
1853 | for (;;) { | |
1854 | /* Dequeue command for registration */ | |
1855 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
1856 | if (node == NULL) { | |
1857 | break; | |
1858 | } | |
1859 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1860 | ret = close(ust_cmd->sock); | |
1861 | if (ret < 0) { | |
1862 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
1863 | } | |
1864 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1865 | free(ust_cmd); | |
1866 | } | |
1867 | ||
9ad42ec1 | 1868 | error_testpoint: |
099e26bd | 1869 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1870 | if (err) { |
1871 | health_error(); | |
1872 | ERR("Health error occurred in %s", __func__); | |
1873 | } | |
8782cc74 | 1874 | health_unregister(health_sessiond); |
967e3668 | 1875 | rcu_unregister_thread(); |
099e26bd DG |
1876 | return NULL; |
1877 | } | |
1878 | ||
1879 | /* | |
1880 | * This thread manage application registration. | |
1881 | */ | |
1882 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1883 | { |
139ac872 | 1884 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1885 | uint32_t revents, nb_fd; |
1886 | struct lttng_poll_event events; | |
099e26bd DG |
1887 | /* |
1888 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1889 | * freed in the manage apps thread. | |
1890 | */ | |
1891 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1892 | |
099e26bd | 1893 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1894 | |
6c71277b | 1895 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1896 | |
e547b070 | 1897 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
1898 | goto error_testpoint; |
1899 | } | |
8ac94142 | 1900 | |
1d4b027a DG |
1901 | ret = lttcomm_listen_unix_sock(apps_sock); |
1902 | if (ret < 0) { | |
76d7553f | 1903 | goto error_listen; |
1d4b027a DG |
1904 | } |
1905 | ||
5eb91c98 DG |
1906 | /* |
1907 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1908 | * more will be added to this poll set. | |
1909 | */ | |
d0b96690 | 1910 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1911 | if (ret < 0) { |
76d7553f | 1912 | goto error_create_poll; |
5eb91c98 | 1913 | } |
273ea72c | 1914 | |
5eb91c98 DG |
1915 | /* Add the application registration socket */ |
1916 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1917 | if (ret < 0) { | |
76d7553f | 1918 | goto error_poll_add; |
5eb91c98 | 1919 | } |
273ea72c | 1920 | |
1d4b027a | 1921 | /* Notify all applications to register */ |
0fdd1e2c DG |
1922 | ret = notify_ust_apps(1); |
1923 | if (ret < 0) { | |
1924 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1925 | "Execution continues but there might be problem for already\n" |
1926 | "running applications that wishes to register."); | |
0fdd1e2c | 1927 | } |
1d4b027a DG |
1928 | |
1929 | while (1) { | |
1930 | DBG("Accepting application registration"); | |
273ea72c DG |
1931 | |
1932 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1933 | restart: |
a78af745 | 1934 | health_poll_entry(); |
5eb91c98 | 1935 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1936 | health_poll_exit(); |
273ea72c | 1937 | if (ret < 0) { |
88f2b785 MD |
1938 | /* |
1939 | * Restart interrupted system call. | |
1940 | */ | |
1941 | if (errno == EINTR) { | |
1942 | goto restart; | |
1943 | } | |
273ea72c DG |
1944 | goto error; |
1945 | } | |
1946 | ||
0d9c5d77 DG |
1947 | nb_fd = ret; |
1948 | ||
5eb91c98 | 1949 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1950 | health_code_update(); |
139ac872 | 1951 | |
5eb91c98 DG |
1952 | /* Fetch once the poll data */ |
1953 | revents = LTTNG_POLL_GETEV(&events, i); | |
1954 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1955 | |
fd20dac9 MD |
1956 | if (!revents) { |
1957 | /* No activity for this FD (poll implementation). */ | |
1958 | continue; | |
1959 | } | |
1960 | ||
5eb91c98 | 1961 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1962 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1963 | if (ret) { |
139ac872 MD |
1964 | err = 0; |
1965 | goto exit; | |
90014c57 | 1966 | } |
1d4b027a | 1967 | |
5eb91c98 DG |
1968 | /* Event on the registration socket */ |
1969 | if (pollfd == apps_sock) { | |
03e43155 | 1970 | if (revents & LPOLLIN) { |
5eb91c98 DG |
1971 | sock = lttcomm_accept_unix_sock(apps_sock); |
1972 | if (sock < 0) { | |
1973 | goto error; | |
1974 | } | |
099e26bd | 1975 | |
16c5c8fa DG |
1976 | /* |
1977 | * Set socket timeout for both receiving and ending. | |
1978 | * app_socket_timeout is in seconds, whereas | |
1979 | * lttcomm_setsockopt_rcv_timeout and | |
1980 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1981 | * parameter. | |
1982 | */ | |
e6142f2e | 1983 | if (config.app_socket_timeout >= 0) { |
28ce0ff2 | 1984 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
e6142f2e | 1985 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1986 | (void) lttcomm_setsockopt_snd_timeout(sock, |
e6142f2e | 1987 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1988 | } |
16c5c8fa | 1989 | |
b662582b DG |
1990 | /* |
1991 | * Set the CLOEXEC flag. Return code is useless because | |
1992 | * either way, the show must go on. | |
1993 | */ | |
1994 | (void) utils_set_fd_cloexec(sock); | |
1995 | ||
5eb91c98 | 1996 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1997 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1998 | if (ust_cmd == NULL) { |
76d7553f | 1999 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2000 | ret = close(sock); |
2001 | if (ret) { | |
2002 | PERROR("close"); | |
2003 | } | |
5eb91c98 DG |
2004 | goto error; |
2005 | } | |
1d4b027a | 2006 | |
5eb91c98 DG |
2007 | /* |
2008 | * Using message-based transmissions to ensure we don't | |
2009 | * have to deal with partially received messages. | |
2010 | */ | |
4063050c MD |
2011 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2012 | if (ret < 0) { | |
2013 | ERR("Exhausted file descriptors allowed for applications."); | |
2014 | free(ust_cmd); | |
2015 | ret = close(sock); | |
2016 | if (ret) { | |
2017 | PERROR("close"); | |
2018 | } | |
2019 | sock = -1; | |
2020 | continue; | |
2021 | } | |
d88aee68 | 2022 | |
840cb59c | 2023 | health_code_update(); |
d0b96690 DG |
2024 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2025 | if (ret < 0) { | |
5eb91c98 | 2026 | free(ust_cmd); |
d0b96690 | 2027 | /* Close socket of the application. */ |
76d7553f MD |
2028 | ret = close(sock); |
2029 | if (ret) { | |
2030 | PERROR("close"); | |
2031 | } | |
4063050c | 2032 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2033 | sock = -1; |
5eb91c98 DG |
2034 | continue; |
2035 | } | |
840cb59c | 2036 | health_code_update(); |
099e26bd | 2037 | |
5eb91c98 | 2038 | ust_cmd->sock = sock; |
34a2494f | 2039 | sock = -1; |
099e26bd | 2040 | |
5eb91c98 DG |
2041 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2042 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2043 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2044 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2045 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2046 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2047 | |
5eb91c98 DG |
2048 | /* |
2049 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2050 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2051 | */ |
8bdee6e2 | 2052 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2053 | |
2054 | /* | |
2055 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2056 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2057 | */ |
2058 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2059 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2060 | ERR("Register apps socket poll error"); | |
2061 | goto error; | |
2062 | } else { | |
2063 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2064 | goto error; | |
5eb91c98 DG |
2065 | } |
2066 | } | |
90014c57 | 2067 | } |
1d4b027a DG |
2068 | } |
2069 | ||
139ac872 | 2070 | exit: |
1d4b027a | 2071 | error: |
0fdd1e2c DG |
2072 | /* Notify that the registration thread is gone */ |
2073 | notify_ust_apps(0); | |
2074 | ||
a4b35e07 | 2075 | if (apps_sock >= 0) { |
76d7553f MD |
2076 | ret = close(apps_sock); |
2077 | if (ret) { | |
2078 | PERROR("close"); | |
2079 | } | |
a4b35e07 | 2080 | } |
46c3f085 | 2081 | if (sock >= 0) { |
76d7553f MD |
2082 | ret = close(sock); |
2083 | if (ret) { | |
2084 | PERROR("close"); | |
2085 | } | |
4063050c | 2086 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2087 | } |
e6142f2e | 2088 | unlink(config.apps_unix_sock_path.value); |
0fdd1e2c | 2089 | |
76d7553f | 2090 | error_poll_add: |
5eb91c98 | 2091 | lttng_poll_clean(&events); |
76d7553f MD |
2092 | error_listen: |
2093 | error_create_poll: | |
6993eeb3 | 2094 | error_testpoint: |
76d7553f | 2095 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2096 | if (err) { |
2097 | health_error(); | |
2098 | ERR("Health error occurred in %s", __func__); | |
2099 | } | |
8782cc74 | 2100 | health_unregister(health_sessiond); |
5eb91c98 | 2101 | |
1d4b027a DG |
2102 | return NULL; |
2103 | } | |
2104 | ||
8c0faa1d | 2105 | /* |
3bd1e081 | 2106 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2107 | * exec or it will fails. |
8c0faa1d | 2108 | */ |
3bd1e081 | 2109 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2110 | { |
a23ec3a7 | 2111 | int ret, clock_ret; |
ee0b0061 DG |
2112 | struct timespec timeout; |
2113 | ||
13a7bce3 JG |
2114 | /* |
2115 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2116 | * This access to consumer_thread_is_ready does not need to be | |
2117 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2118 | * management thread has not been started at this point. | |
2119 | */ | |
a23ec3a7 | 2120 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2121 | |
a23ec3a7 DG |
2122 | /* Setup pthread condition */ |
2123 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2124 | if (ret) { |
a23ec3a7 DG |
2125 | errno = ret; |
2126 | PERROR("pthread_condattr_init consumer data"); | |
2127 | goto error; | |
2128 | } | |
2129 | ||
2130 | /* | |
2131 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2132 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2133 | * for a more details and how we noticed it. | |
2134 | */ | |
2135 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2136 | if (ret) { |
a23ec3a7 DG |
2137 | errno = ret; |
2138 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2139 | goto error; |
2140 | } | |
8c0faa1d | 2141 | |
a23ec3a7 | 2142 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2143 | if (ret) { |
a23ec3a7 DG |
2144 | errno = ret; |
2145 | PERROR("pthread_cond_init consumer data"); | |
2146 | goto error; | |
2147 | } | |
2148 | ||
1a1a34b4 MJ |
2149 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2150 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2151 | if (ret) { |
2152 | errno = ret; | |
3bd1e081 | 2153 | PERROR("pthread_create consumer"); |
ee0b0061 | 2154 | ret = -1; |
8c0faa1d DG |
2155 | goto error; |
2156 | } | |
2157 | ||
a23ec3a7 DG |
2158 | /* We are about to wait on a pthread condition */ |
2159 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2160 | ||
ee0b0061 | 2161 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2162 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2163 | /* |
2164 | * Set the timeout for the condition timed wait even if the clock gettime | |
2165 | * call fails since we might loop on that call and we want to avoid to | |
2166 | * increment the timeout too many times. | |
2167 | */ | |
2168 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2169 | ||
2170 | /* | |
2171 | * The following loop COULD be skipped in some conditions so this is why we | |
2172 | * set ret to 0 in order to make sure at least one round of the loop is | |
2173 | * done. | |
2174 | */ | |
2175 | ret = 0; | |
2176 | ||
2177 | /* | |
2178 | * Loop until the condition is reached or when a timeout is reached. Note | |
2179 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2180 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2181 | * possible. This loop does not take any chances and works with both of | |
2182 | * them. | |
2183 | */ | |
2184 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2185 | if (clock_ret < 0) { | |
2186 | PERROR("clock_gettime spawn consumer"); | |
2187 | /* Infinite wait for the consumerd thread to be ready */ | |
2188 | ret = pthread_cond_wait(&consumer_data->cond, | |
2189 | &consumer_data->cond_mutex); | |
2190 | } else { | |
2191 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2192 | &consumer_data->cond_mutex, &timeout); | |
2193 | } | |
ee0b0061 | 2194 | } |
8c0faa1d | 2195 | |
a23ec3a7 DG |
2196 | /* Release the pthread condition */ |
2197 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2198 | ||
2199 | if (ret != 0) { | |
2200 | errno = ret; | |
2201 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2202 | int pth_ret; |
2203 | ||
ee0b0061 DG |
2204 | /* |
2205 | * Call has timed out so we kill the kconsumerd_thread and return | |
2206 | * an error. | |
2207 | */ | |
a23ec3a7 DG |
2208 | ERR("Condition timed out. The consumer thread was never ready." |
2209 | " Killing it"); | |
4282f9a3 DG |
2210 | pth_ret = pthread_cancel(consumer_data->thread); |
2211 | if (pth_ret < 0) { | |
3bd1e081 | 2212 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2213 | } |
2214 | } else { | |
a23ec3a7 | 2215 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2216 | } |
4282f9a3 DG |
2217 | /* Caller is expecting a negative value on failure. */ |
2218 | ret = -1; | |
ee0b0061 DG |
2219 | goto error; |
2220 | } | |
2221 | ||
3bd1e081 MD |
2222 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2223 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2224 | ERR("Consumerd did not start"); |
3bd1e081 | 2225 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2226 | goto error; |
2227 | } | |
3bd1e081 | 2228 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2229 | |
8c0faa1d DG |
2230 | return 0; |
2231 | ||
2232 | error: | |
2233 | return ret; | |
2234 | } | |
2235 | ||
d9800920 | 2236 | /* |
3bd1e081 | 2237 | * Join consumer thread |
d9800920 | 2238 | */ |
3bd1e081 | 2239 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2240 | { |
2241 | void *status; | |
cf3af59e | 2242 | |
e8209f6b DG |
2243 | /* Consumer pid must be a real one. */ |
2244 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2245 | int ret; |
3bd1e081 | 2246 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2247 | if (ret) { |
4a15001e | 2248 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2249 | return ret; |
2250 | } | |
3bd1e081 | 2251 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2252 | } else { |
2253 | return 0; | |
2254 | } | |
2255 | } | |
2256 | ||
8c0faa1d | 2257 | /* |
3bd1e081 | 2258 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2259 | * |
d063d709 | 2260 | * Return pid if successful else -1. |
8c0faa1d | 2261 | */ |
3bd1e081 | 2262 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2263 | { |
2264 | int ret; | |
2265 | pid_t pid; | |
94c55f17 | 2266 | const char *consumer_to_use; |
53086306 | 2267 | const char *verbosity; |
94c55f17 | 2268 | struct stat st; |
8c0faa1d | 2269 | |
3bd1e081 | 2270 | DBG("Spawning consumerd"); |
c49dc785 | 2271 | |
8c0faa1d DG |
2272 | pid = fork(); |
2273 | if (pid == 0) { | |
2274 | /* | |
3bd1e081 | 2275 | * Exec consumerd. |
8c0faa1d | 2276 | */ |
e6142f2e | 2277 | if (config.verbose_consumer) { |
53086306 | 2278 | verbosity = "--verbose"; |
4421f712 | 2279 | } else if (lttng_opt_quiet) { |
53086306 | 2280 | verbosity = "--quiet"; |
4421f712 DG |
2281 | } else { |
2282 | verbosity = ""; | |
53086306 | 2283 | } |
4421f712 | 2284 | |
3bd1e081 MD |
2285 | switch (consumer_data->type) { |
2286 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2287 | /* |
c7704d57 DG |
2288 | * Find out which consumerd to execute. We will first try the |
2289 | * 64-bit path, then the sessiond's installation directory, and | |
2290 | * fallback on the 32-bit one, | |
94c55f17 | 2291 | */ |
63a799e8 | 2292 | DBG3("Looking for a kernel consumer at these locations:"); |
59ee5091 | 2293 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
e6142f2e | 2294 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
59ee5091 | 2295 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
e6142f2e | 2296 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
63a799e8 | 2297 | DBG3("Found location #1"); |
e6142f2e JG |
2298 | consumer_to_use = config.consumerd64_bin_path.value; |
2299 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
63a799e8 | 2300 | DBG3("Found location #2"); |
e6142f2e | 2301 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
a1a9f823 JG |
2302 | } else if (config.consumerd32_bin_path.value && |
2303 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
63a799e8 | 2304 | DBG3("Found location #3"); |
e6142f2e | 2305 | consumer_to_use = config.consumerd32_bin_path.value; |
94c55f17 | 2306 | } else { |
63a799e8 | 2307 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2308 | ret = -EINVAL; |
3d678709 | 2309 | goto error; |
94c55f17 AM |
2310 | } |
2311 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
6e2cc8d8 | 2312 | (void) execl(consumer_to_use, |
94c55f17 AM |
2313 | "lttng-consumerd", verbosity, "-k", |
2314 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2315 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2316 | "--group", config.tracing_group_name.value, |
94c55f17 | 2317 | NULL); |
3bd1e081 | 2318 | break; |
7753dea8 MD |
2319 | case LTTNG_CONSUMER64_UST: |
2320 | { | |
46b23495 | 2321 | if (config.consumerd64_lib_dir.value) { |
8f4905da MD |
2322 | char *tmp; |
2323 | size_t tmplen; | |
ddaec4a2 | 2324 | char *tmpnew; |
8f4905da | 2325 | |
e8fa9fb0 | 2326 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2327 | if (!tmp) { |
2328 | tmp = ""; | |
2329 | } | |
d222983e | 2330 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2331 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2332 | if (!tmpnew) { | |
2333 | ret = -ENOMEM; | |
2334 | goto error; | |
2335 | } | |
e6142f2e | 2336 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
8f4905da MD |
2337 | if (tmp[0] != '\0') { |
2338 | strcat(tmpnew, ":"); | |
2339 | strcat(tmpnew, tmp); | |
2340 | } | |
d222983e | 2341 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2342 | free(tmpnew); |
8f4905da MD |
2343 | if (ret) { |
2344 | ret = -errno; | |
2345 | goto error; | |
2346 | } | |
2347 | } | |
e6142f2e JG |
2348 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
2349 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2350 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2351 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2352 | "--group", config.tracing_group_name.value, |
7753dea8 | 2353 | NULL); |
3bd1e081 | 2354 | break; |
7753dea8 MD |
2355 | } |
2356 | case LTTNG_CONSUMER32_UST: | |
2357 | { | |
46b23495 | 2358 | if (config.consumerd32_lib_dir.value) { |
8f4905da MD |
2359 | char *tmp; |
2360 | size_t tmplen; | |
ddaec4a2 | 2361 | char *tmpnew; |
8f4905da | 2362 | |
e8fa9fb0 | 2363 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2364 | if (!tmp) { |
2365 | tmp = ""; | |
2366 | } | |
d222983e | 2367 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2368 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2369 | if (!tmpnew) { | |
2370 | ret = -ENOMEM; | |
2371 | goto error; | |
2372 | } | |
e6142f2e | 2373 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
8f4905da MD |
2374 | if (tmp[0] != '\0') { |
2375 | strcat(tmpnew, ":"); | |
2376 | strcat(tmpnew, tmp); | |
2377 | } | |
d222983e | 2378 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2379 | free(tmpnew); |
8f4905da MD |
2380 | if (ret) { |
2381 | ret = -errno; | |
2382 | goto error; | |
2383 | } | |
2384 | } | |
e6142f2e JG |
2385 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
2386 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2387 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2388 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2389 | "--group", config.tracing_group_name.value, |
7753dea8 MD |
2390 | NULL); |
2391 | break; | |
2392 | } | |
3bd1e081 | 2393 | default: |
b60e7183 | 2394 | ERR("unknown consumer type"); |
e9d6b496 | 2395 | errno = 0; |
3bd1e081 | 2396 | } |
8c0faa1d | 2397 | if (errno != 0) { |
4282f9a3 | 2398 | PERROR("Consumer execl()"); |
8c0faa1d | 2399 | } |
4282f9a3 | 2400 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2401 | exit(EXIT_FAILURE); |
2402 | } else if (pid > 0) { | |
2403 | ret = pid; | |
8c0faa1d | 2404 | } else { |
76d7553f | 2405 | PERROR("start consumer fork"); |
8c0faa1d | 2406 | ret = -errno; |
8c0faa1d | 2407 | } |
8f4905da | 2408 | error: |
8c0faa1d DG |
2409 | return ret; |
2410 | } | |
2411 | ||
693bd40b | 2412 | /* |
3bd1e081 | 2413 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2414 | */ |
3bd1e081 | 2415 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2416 | { |
c617c0c6 | 2417 | int ret; |
edb8b045 DG |
2418 | |
2419 | /* | |
2420 | * Set the listen() state on the socket since there is a possible race | |
2421 | * between the exec() of the consumer daemon and this call if place in the | |
2422 | * consumer thread. See bug #366 for more details. | |
2423 | */ | |
2424 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2425 | if (ret < 0) { | |
2426 | goto error; | |
2427 | } | |
693bd40b | 2428 | |
3bd1e081 MD |
2429 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2430 | if (consumer_data->pid != 0) { | |
2431 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2432 | goto end; |
2433 | } | |
693bd40b | 2434 | |
3bd1e081 | 2435 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2436 | if (ret < 0) { |
3bd1e081 MD |
2437 | ERR("Spawning consumerd failed"); |
2438 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2439 | goto error; |
693bd40b | 2440 | } |
c49dc785 | 2441 | |
3bd1e081 MD |
2442 | /* Setting up the consumer_data pid */ |
2443 | consumer_data->pid = ret; | |
48842b30 | 2444 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2445 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2446 | |
3bd1e081 MD |
2447 | DBG2("Spawning consumer control thread"); |
2448 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2449 | if (ret < 0) { |
3bd1e081 | 2450 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2451 | goto error; |
2452 | } | |
2453 | ||
c49dc785 | 2454 | end: |
693bd40b DG |
2455 | return 0; |
2456 | ||
2457 | error: | |
331744e3 | 2458 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2459 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2460 | int err; |
2461 | ||
edb8b045 DG |
2462 | err = close(consumer_data->err_sock); |
2463 | if (err < 0) { | |
2464 | PERROR("close consumer data error socket"); | |
2465 | } | |
2466 | } | |
693bd40b DG |
2467 | return ret; |
2468 | } | |
2469 | ||
b73401da | 2470 | /* |
096102bd | 2471 | * Setup necessary data for kernel tracer action. |
b73401da | 2472 | */ |
096102bd | 2473 | static int init_kernel_tracer(void) |
b73401da DG |
2474 | { |
2475 | int ret; | |
b73401da | 2476 | |
096102bd DG |
2477 | /* Modprobe lttng kernel modules */ |
2478 | ret = modprobe_lttng_control(); | |
b73401da | 2479 | if (ret < 0) { |
b73401da DG |
2480 | goto error; |
2481 | } | |
2482 | ||
096102bd DG |
2483 | /* Open debugfs lttng */ |
2484 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2485 | if (kernel_tracer_fd < 0) { | |
2486 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2487 | goto error_open; |
54d01ffb DG |
2488 | } |
2489 | ||
2f77fc4b | 2490 | /* Validate kernel version */ |
88076e89 JD |
2491 | ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version, |
2492 | &kernel_tracer_abi_version); | |
2f77fc4b DG |
2493 | if (ret < 0) { |
2494 | goto error_version; | |
b551a063 | 2495 | } |
54d01ffb | 2496 | |
2f77fc4b DG |
2497 | ret = modprobe_lttng_data(); |
2498 | if (ret < 0) { | |
2499 | goto error_modules; | |
54d01ffb DG |
2500 | } |
2501 | ||
6e21424e JR |
2502 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
2503 | kernel_tracer_fd); | |
2504 | if (ret < 0) { | |
2505 | goto error_modules; | |
2506 | } | |
2507 | ||
2508 | if (ret < 1) { | |
2509 | WARN("Kernel tracer does not support buffer monitoring. " | |
2510 | "The monitoring timer of channels in the kernel domain " | |
2511 | "will be set to 0 (disabled)."); | |
2512 | } | |
2513 | ||
2f77fc4b DG |
2514 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2515 | return 0; | |
2516 | ||
2517 | error_version: | |
2518 | modprobe_remove_lttng_control(); | |
2519 | ret = close(kernel_tracer_fd); | |
2520 | if (ret) { | |
2521 | PERROR("close"); | |
b551a063 | 2522 | } |
2f77fc4b | 2523 | kernel_tracer_fd = -1; |
f73fabfd | 2524 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2525 | |
2f77fc4b DG |
2526 | error_modules: |
2527 | ret = close(kernel_tracer_fd); | |
2528 | if (ret) { | |
2529 | PERROR("close"); | |
b551a063 | 2530 | } |
54d01ffb | 2531 | |
2f77fc4b DG |
2532 | error_open: |
2533 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2534 | |
2535 | error: | |
2f77fc4b DG |
2536 | WARN("No kernel tracer available"); |
2537 | kernel_tracer_fd = -1; | |
2538 | if (!is_root) { | |
f73fabfd | 2539 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2540 | } else { |
f73fabfd | 2541 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2542 | } |
54d01ffb DG |
2543 | } |
2544 | ||
2f77fc4b | 2545 | |
54d01ffb | 2546 | /* |
2f77fc4b DG |
2547 | * Copy consumer output from the tracing session to the domain session. The |
2548 | * function also applies the right modification on a per domain basis for the | |
2549 | * trace files destination directory. | |
36b588ed MD |
2550 | * |
2551 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2552 | */ |
2f77fc4b | 2553 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2554 | { |
2555 | int ret; | |
2f77fc4b DG |
2556 | const char *dir_name; |
2557 | struct consumer_output *consumer; | |
2558 | ||
2559 | assert(session); | |
2560 | assert(session->consumer); | |
54d01ffb | 2561 | |
b551a063 DG |
2562 | switch (domain) { |
2563 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2564 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2565 | /* |
2566 | * XXX: We should audit the session creation and what this function | |
2567 | * does "extra" in order to avoid a destroy since this function is used | |
2568 | * in the domain session creation (kernel and ust) only. Same for UST | |
2569 | * domain. | |
2570 | */ | |
2571 | if (session->kernel_session->consumer) { | |
6addfa37 | 2572 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2573 | } |
2f77fc4b DG |
2574 | session->kernel_session->consumer = |
2575 | consumer_copy_output(session->consumer); | |
2576 | /* Ease our life a bit for the next part */ | |
2577 | consumer = session->kernel_session->consumer; | |
2578 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2579 | break; |
f20baf8e | 2580 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2581 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2582 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2583 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2584 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2585 | if (session->ust_session->consumer) { |
6addfa37 | 2586 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2587 | } |
2f77fc4b DG |
2588 | session->ust_session->consumer = |
2589 | consumer_copy_output(session->consumer); | |
2590 | /* Ease our life a bit for the next part */ | |
2591 | consumer = session->ust_session->consumer; | |
2592 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2593 | break; |
2594 | default: | |
f73fabfd | 2595 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2596 | goto error; |
2597 | } | |
2598 | ||
2f77fc4b | 2599 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2600 | strncat(consumer->subdir, dir_name, |
2601 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2602 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2603 | ||
f73fabfd | 2604 | ret = LTTNG_OK; |
54d01ffb DG |
2605 | |
2606 | error: | |
2607 | return ret; | |
2608 | } | |
2609 | ||
00e2e675 | 2610 | /* |
2f77fc4b | 2611 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2612 | * |
2613 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2614 | */ |
2f77fc4b DG |
2615 | static int create_ust_session(struct ltt_session *session, |
2616 | struct lttng_domain *domain) | |
00e2e675 DG |
2617 | { |
2618 | int ret; | |
2f77fc4b | 2619 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2620 | |
a4b92340 | 2621 | assert(session); |
2f77fc4b DG |
2622 | assert(domain); |
2623 | assert(session->consumer); | |
a4b92340 | 2624 | |
2f77fc4b | 2625 | switch (domain->type) { |
f20baf8e | 2626 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2627 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2628 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2629 | case LTTNG_DOMAIN_UST: |
2630 | break; | |
2631 | default: | |
2632 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2633 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2634 | goto error; |
2635 | } | |
2636 | ||
2f77fc4b DG |
2637 | DBG("Creating UST session"); |
2638 | ||
dec56f6c | 2639 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2640 | if (lus == NULL) { |
f73fabfd | 2641 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2642 | goto error; |
2643 | } | |
2644 | ||
2f77fc4b DG |
2645 | lus->uid = session->uid; |
2646 | lus->gid = session->gid; | |
2bba9e53 | 2647 | lus->output_traces = session->output_traces; |
27babd3a | 2648 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2649 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2650 | session->ust_session = lus; |
d7ba1388 | 2651 | if (session->shm_path[0]) { |
3d071855 MD |
2652 | strncpy(lus->root_shm_path, session->shm_path, |
2653 | sizeof(lus->root_shm_path)); | |
2654 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2655 | strncpy(lus->shm_path, session->shm_path, |
2656 | sizeof(lus->shm_path)); | |
2657 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2658 | strncat(lus->shm_path, "/ust", | |
2659 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2660 | } | |
2f77fc4b DG |
2661 | /* Copy session output to the newly created UST session */ |
2662 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2663 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2664 | goto error; |
2665 | } | |
2666 | ||
f73fabfd | 2667 | return LTTNG_OK; |
00e2e675 DG |
2668 | |
2669 | error: | |
2f77fc4b DG |
2670 | free(lus); |
2671 | session->ust_session = NULL; | |
00e2e675 DG |
2672 | return ret; |
2673 | } | |
2674 | ||
2675 | /* | |
2f77fc4b | 2676 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2677 | */ |
2f77fc4b | 2678 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2679 | { |
2680 | int ret; | |
a4b92340 | 2681 | |
2f77fc4b | 2682 | DBG("Creating kernel session"); |
00e2e675 | 2683 | |
2f77fc4b DG |
2684 | ret = kernel_create_session(session, kernel_tracer_fd); |
2685 | if (ret < 0) { | |
f73fabfd | 2686 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2687 | goto error; |
2688 | } | |
2689 | ||
2f77fc4b DG |
2690 | /* Code flow safety */ |
2691 | assert(session->kernel_session); | |
2692 | ||
2693 | /* Copy session output to the newly created Kernel session */ | |
2694 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2695 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2696 | goto error; |
2697 | } | |
2698 | ||
2f77fc4b DG |
2699 | session->kernel_session->uid = session->uid; |
2700 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2701 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2702 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2703 | |
f73fabfd | 2704 | return LTTNG_OK; |
00e2e675 | 2705 | |
2f77fc4b DG |
2706 | error: |
2707 | trace_kernel_destroy_session(session->kernel_session); | |
2708 | session->kernel_session = NULL; | |
2709 | return ret; | |
2710 | } | |
00e2e675 | 2711 | |
2f77fc4b DG |
2712 | /* |
2713 | * Count number of session permitted by uid/gid. | |
2714 | */ | |
2715 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2716 | { | |
2717 | unsigned int i = 0; | |
2718 | struct ltt_session *session; | |
07424f16 | 2719 | |
2f77fc4b DG |
2720 | DBG("Counting number of available session for UID %d GID %d", |
2721 | uid, gid); | |
2722 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2723 | /* |
2f77fc4b | 2724 | * Only list the sessions the user can control. |
00e2e675 | 2725 | */ |
2f77fc4b DG |
2726 | if (!session_access_ok(session, uid, gid)) { |
2727 | continue; | |
2728 | } | |
2729 | i++; | |
a4b92340 | 2730 | } |
2f77fc4b | 2731 | return i; |
00e2e675 DG |
2732 | } |
2733 | ||
dcabc190 FD |
2734 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
2735 | int *sock_error, struct lttng_event *event) | |
2736 | { | |
2737 | int fd, ret; | |
2738 | struct lttng_userspace_probe_location *probe_location; | |
87597c2c | 2739 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
dcabc190 FD |
2740 | struct lttng_dynamic_buffer probe_location_buffer; |
2741 | struct lttng_buffer_view buffer_view; | |
2742 | ||
2743 | /* | |
2744 | * Create a buffer to store the serialized version of the probe | |
2745 | * location. | |
2746 | */ | |
2747 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
2748 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
2749 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
2750 | if (ret) { | |
2751 | ret = LTTNG_ERR_NOMEM; | |
2752 | goto error; | |
2753 | } | |
2754 | ||
2755 | /* | |
2756 | * Receive the probe location. | |
2757 | */ | |
2758 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
2759 | probe_location_buffer.size); | |
2760 | if (ret <= 0) { | |
2761 | DBG("Nothing recv() from client var len data... continuing"); | |
2762 | *sock_error = 1; | |
2763 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2764 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2765 | goto error; | |
2766 | } | |
2767 | ||
2768 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
2769 | &probe_location_buffer, 0, probe_location_buffer.size); | |
2770 | ||
2771 | /* | |
2772 | * Extract the probe location from the serialized version. | |
2773 | */ | |
2774 | ret = lttng_userspace_probe_location_create_from_buffer( | |
2775 | &buffer_view, &probe_location); | |
2776 | if (ret < 0) { | |
2777 | WARN("Failed to create a userspace probe location from the received buffer"); | |
2778 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
2779 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2780 | goto error; | |
2781 | } | |
2782 | ||
2783 | /* | |
2784 | * Receive the file descriptor to the target binary from the client. | |
2785 | */ | |
2786 | DBG("Receiving userspace probe target FD from client ..."); | |
2787 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2788 | if (ret <= 0) { | |
2789 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
2790 | *sock_error = 1; | |
2791 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2792 | goto error; | |
2793 | } | |
2794 | ||
2795 | /* | |
2796 | * Set the file descriptor received from the client through the unix | |
2797 | * socket in the probe location. | |
2798 | */ | |
2799 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
2800 | if (!lookup) { | |
2801 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2802 | goto error; | |
2803 | } | |
2804 | ||
2805 | /* | |
2806 | * From the kernel tracer's perspective, all userspace probe event types | |
2807 | * are all the same: a file and an offset. | |
2808 | */ | |
2809 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
2810 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
2811 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
2812 | probe_location, fd); | |
2813 | break; | |
2814 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
2815 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
2816 | probe_location, fd); | |
2817 | break; | |
2818 | default: | |
2819 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2820 | goto error; | |
2821 | } | |
2822 | ||
2823 | if (ret) { | |
2824 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2825 | goto error; | |
2826 | } | |
2827 | ||
2828 | /* Attach the probe location to the event. */ | |
2829 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
2830 | if (ret) { | |
2831 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2832 | goto error; | |
2833 | } | |
2834 | ||
2835 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2836 | error: | |
2837 | return ret; | |
2838 | } | |
2839 | ||
5c408ad8 JD |
2840 | /* |
2841 | * Check if the current kernel tracer supports the session rotation feature. | |
2842 | * Return 1 if it does, 0 otherwise. | |
2843 | */ | |
2844 | static int check_rotate_compatible(void) | |
2845 | { | |
2846 | int ret = 1; | |
2847 | ||
2848 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
2849 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2850 | ret = 0; | |
2851 | } | |
2852 | ||
2853 | return ret; | |
2854 | } | |
2855 | ||
54d01ffb DG |
2856 | /* |
2857 | * Process the command requested by the lttng client within the command | |
2858 | * context structure. This function make sure that the return structure (llm) | |
2859 | * is set and ready for transmission before returning. | |
2860 | * | |
2861 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2862 | * |
2863 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2864 | * |
2865 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2866 | */ |
53a80697 MD |
2867 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2868 | int *sock_error) | |
54d01ffb | 2869 | { |
f73fabfd | 2870 | int ret = LTTNG_OK; |
44d3bd01 | 2871 | int need_tracing_session = 1; |
2e09ba09 | 2872 | int need_domain; |
54d01ffb DG |
2873 | |
2874 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2875 | ||
3745d315 MD |
2876 | assert(!rcu_read_ongoing()); |
2877 | ||
53a80697 MD |
2878 | *sock_error = 0; |
2879 | ||
2e09ba09 MD |
2880 | switch (cmd_ctx->lsm->cmd_type) { |
2881 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2882 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2883 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2884 | case LTTNG_DESTROY_SESSION: |
2885 | case LTTNG_LIST_SESSIONS: | |
2886 | case LTTNG_LIST_DOMAINS: | |
2887 | case LTTNG_START_TRACE: | |
2888 | case LTTNG_STOP_TRACE: | |
6d805429 | 2889 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2890 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2891 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2892 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2893 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 2894 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 2895 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 2896 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 2897 | case LTTNG_REGENERATE_STATEDUMP: |
b3530820 JG |
2898 | case LTTNG_REGISTER_TRIGGER: |
2899 | case LTTNG_UNREGISTER_TRIGGER: | |
5c408ad8 | 2900 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2901 | case LTTNG_ROTATION_GET_INFO: |
259c2674 | 2902 | case LTTNG_ROTATION_SET_SCHEDULE: |
66ea93b1 | 2903 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
2e09ba09 | 2904 | need_domain = 0; |
3aace903 | 2905 | break; |
2e09ba09 MD |
2906 | default: |
2907 | need_domain = 1; | |
2908 | } | |
2909 | ||
e6142f2e | 2910 | if (config.no_kernel && need_domain |
2e09ba09 | 2911 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
531d29f9 | 2912 | if (!is_root) { |
f73fabfd | 2913 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2914 | } else { |
f73fabfd | 2915 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2916 | } |
4fba7219 DG |
2917 | goto error; |
2918 | } | |
2919 | ||
8d3113b2 DG |
2920 | /* Deny register consumer if we already have a spawned consumer. */ |
2921 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2922 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2923 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2924 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2925 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2926 | goto error; |
2927 | } | |
2928 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2929 | } | |
2930 | ||
54d01ffb DG |
2931 | /* |
2932 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2933 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2934 | * command. |
2935 | */ | |
2936 | switch(cmd_ctx->lsm->cmd_type) { | |
2937 | case LTTNG_LIST_SESSIONS: | |
2938 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2939 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2940 | case LTTNG_LIST_DOMAINS: |
2941 | case LTTNG_LIST_CHANNELS: | |
2942 | case LTTNG_LIST_EVENTS: | |
834978fd | 2943 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 2944 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 2945 | case LTTNG_DATA_PENDING: |
5c408ad8 | 2946 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2947 | case LTTNG_ROTATION_GET_INFO: |
66ea93b1 | 2948 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
54d01ffb DG |
2949 | break; |
2950 | default: | |
2951 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 2952 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
2953 | if (ret < 0) { |
2954 | /* This label does not try to unlock the session */ | |
2955 | goto init_setup_error; | |
2956 | } | |
2957 | } | |
2958 | ||
2959 | /* Commands that DO NOT need a session. */ | |
2960 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2961 | case LTTNG_CREATE_SESSION: |
27babd3a | 2962 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2963 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
2964 | case LTTNG_LIST_SESSIONS: |
2965 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 2966 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 2967 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 2968 | case LTTNG_SAVE_SESSION: |
b3530820 JG |
2969 | case LTTNG_REGISTER_TRIGGER: |
2970 | case LTTNG_UNREGISTER_TRIGGER: | |
44d3bd01 | 2971 | need_tracing_session = 0; |
54d01ffb DG |
2972 | break; |
2973 | default: | |
2974 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2975 | /* |
2976 | * We keep the session list lock across _all_ commands | |
2977 | * for now, because the per-session lock does not | |
2978 | * handle teardown properly. | |
2979 | */ | |
74babd95 | 2980 | session_lock_list(); |
54d01ffb DG |
2981 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2982 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2983 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2984 | goto error; |
2985 | } else { | |
2986 | /* Acquire lock for the session */ | |
2987 | session_lock(cmd_ctx->session); | |
2988 | } | |
2989 | break; | |
2990 | } | |
b389abbe | 2991 | |
5f3ecf22 DG |
2992 | /* |
2993 | * Commands that need a valid session but should NOT create one if none | |
2994 | * exists. Instead of creating one and destroying it when the command is | |
2995 | * handled, process that right before so we save some round trip in useless | |
2996 | * code path. | |
2997 | */ | |
2998 | switch (cmd_ctx->lsm->cmd_type) { | |
2999 | case LTTNG_DISABLE_CHANNEL: | |
3000 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3001 | switch (cmd_ctx->lsm->domain.type) { |
3002 | case LTTNG_DOMAIN_KERNEL: | |
3003 | if (!cmd_ctx->session->kernel_session) { | |
3004 | ret = LTTNG_ERR_NO_CHANNEL; | |
3005 | goto error; | |
3006 | } | |
3007 | break; | |
3008 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3009 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3010 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3011 | case LTTNG_DOMAIN_UST: |
3012 | if (!cmd_ctx->session->ust_session) { | |
3013 | ret = LTTNG_ERR_NO_CHANNEL; | |
3014 | goto error; | |
3015 | } | |
3016 | break; | |
3017 | default: | |
3018 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3019 | goto error; | |
3020 | } | |
3021 | default: | |
3022 | break; | |
3023 | } | |
3024 | ||
2e09ba09 MD |
3025 | if (!need_domain) { |
3026 | goto skip_domain; | |
3027 | } | |
a4b92340 | 3028 | |
54d01ffb DG |
3029 | /* |
3030 | * Check domain type for specific "pre-action". | |
3031 | */ | |
3032 | switch (cmd_ctx->lsm->domain.type) { | |
3033 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3034 | if (!is_root) { |
f73fabfd | 3035 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3036 | goto error; |
3037 | } | |
3038 | ||
54d01ffb | 3039 | /* Kernel tracer check */ |
a4b35e07 | 3040 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3041 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3042 | ret = init_kernel_tracer(); |
3043 | if (ret != 0) { | |
54d01ffb DG |
3044 | goto error; |
3045 | } | |
3046 | } | |
5eb91c98 | 3047 | |
5c827ce0 DG |
3048 | /* Consumer is in an ERROR state. Report back to client */ |
3049 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3050 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3051 | goto error; |
3052 | } | |
3053 | ||
54d01ffb | 3054 | /* Need a session for kernel command */ |
44d3bd01 | 3055 | if (need_tracing_session) { |
54d01ffb | 3056 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3057 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3058 | if (ret < 0) { |
f73fabfd | 3059 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3060 | goto error; |
3061 | } | |
b389abbe | 3062 | } |
7d29a247 | 3063 | |
54d01ffb | 3064 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3065 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3066 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3067 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3068 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3069 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3070 | if (ret < 0) { |
f73fabfd | 3071 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3072 | goto error; |
950131af | 3073 | } |
5c827ce0 | 3074 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3075 | } else { |
3076 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3077 | } |
173af62f | 3078 | |
a4b92340 DG |
3079 | /* |
3080 | * The consumer was just spawned so we need to add the socket to | |
3081 | * the consumer output of the session if exist. | |
3082 | */ | |
3083 | ret = consumer_create_socket(&kconsumer_data, | |
3084 | cmd_ctx->session->kernel_session->consumer); | |
3085 | if (ret < 0) { | |
3086 | goto error; | |
173af62f | 3087 | } |
0d0c377a | 3088 | } |
5c827ce0 | 3089 | |
54d01ffb | 3090 | break; |
b9dfb167 | 3091 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3092 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3093 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3094 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3095 | { |
b51ec5b4 MD |
3096 | if (!ust_app_supported()) { |
3097 | ret = LTTNG_ERR_NO_UST; | |
3098 | goto error; | |
3099 | } | |
5c827ce0 DG |
3100 | /* Consumer is in an ERROR state. Report back to client */ |
3101 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3102 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3103 | goto error; |
3104 | } | |
3105 | ||
44d3bd01 | 3106 | if (need_tracing_session) { |
a4b92340 | 3107 | /* Create UST session if none exist. */ |
f6a9efaa | 3108 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3109 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3110 | &cmd_ctx->lsm->domain); |
f73fabfd | 3111 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3112 | goto error; |
3113 | } | |
3114 | } | |
00e2e675 | 3115 | |
7753dea8 MD |
3116 | /* Start the UST consumer daemons */ |
3117 | /* 64-bit */ | |
3118 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
e6142f2e | 3119 | if (config.consumerd64_bin_path.value && |
7753dea8 | 3120 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3121 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3122 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3123 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3124 | if (ret < 0) { |
f73fabfd | 3125 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3126 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3127 | goto error; |
3128 | } | |
48842b30 | 3129 | |
173af62f | 3130 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3131 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3132 | } else { |
7753dea8 MD |
3133 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3134 | } | |
173af62f DG |
3135 | |
3136 | /* | |
3137 | * Setup socket for consumer 64 bit. No need for atomic access | |
3138 | * since it was set above and can ONLY be set in this thread. | |
3139 | */ | |
a4b92340 DG |
3140 | ret = consumer_create_socket(&ustconsumer64_data, |
3141 | cmd_ctx->session->ust_session->consumer); | |
3142 | if (ret < 0) { | |
3143 | goto error; | |
173af62f DG |
3144 | } |
3145 | ||
7753dea8 | 3146 | /* 32-bit */ |
385b881b | 3147 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
e6142f2e | 3148 | if (config.consumerd32_bin_path.value && |
7753dea8 | 3149 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3150 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3151 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3152 | ret = start_consumerd(&ustconsumer32_data); | |
3153 | if (ret < 0) { | |
f73fabfd | 3154 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3155 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3156 | goto error; |
3157 | } | |
5c827ce0 | 3158 | |
173af62f | 3159 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3160 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3161 | } else { |
3162 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3163 | } |
173af62f DG |
3164 | |
3165 | /* | |
92816cc3 | 3166 | * Setup socket for consumer 32 bit. No need for atomic access |
173af62f DG |
3167 | * since it was set above and can ONLY be set in this thread. |
3168 | */ | |
a4b92340 DG |
3169 | ret = consumer_create_socket(&ustconsumer32_data, |
3170 | cmd_ctx->session->ust_session->consumer); | |
3171 | if (ret < 0) { | |
3172 | goto error; | |
173af62f | 3173 | } |
44d3bd01 DG |
3174 | } |
3175 | break; | |
48842b30 | 3176 | } |
54d01ffb | 3177 | default: |
54d01ffb DG |
3178 | break; |
3179 | } | |
2e09ba09 | 3180 | skip_domain: |
33a2b854 | 3181 | |
5c827ce0 DG |
3182 | /* Validate consumer daemon state when start/stop trace command */ |
3183 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3184 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3185 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3186 | case LTTNG_DOMAIN_NONE: |
3187 | break; | |
b9dfb167 | 3188 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3189 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3190 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3191 | case LTTNG_DOMAIN_UST: |
3192 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3193 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3194 | goto error; |
3195 | } | |
3196 | break; | |
3197 | case LTTNG_DOMAIN_KERNEL: | |
3198 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3199 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3200 | goto error; |
3201 | } | |
3202 | break; | |
825535cc JG |
3203 | default: |
3204 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3205 | goto error; | |
5c827ce0 DG |
3206 | } |
3207 | } | |
3208 | ||
8e0af1b4 MD |
3209 | /* |
3210 | * Check that the UID or GID match that of the tracing session. | |
3211 | * The root user can interact with all sessions. | |
3212 | */ | |
3213 | if (need_tracing_session) { | |
3214 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3215 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3216 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3217 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3218 | goto error; |
3219 | } | |
3220 | } | |
3221 | ||
ffe60014 DG |
3222 | /* |
3223 | * Send relayd information to consumer as soon as we have a domain and a | |
3224 | * session defined. | |
3225 | */ | |
3226 | if (cmd_ctx->session && need_domain) { | |
3227 | /* | |
3228 | * Setup relayd if not done yet. If the relayd information was already | |
3229 | * sent to the consumer, this call will gracefully return. | |
3230 | */ | |
3231 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3232 | if (ret != LTTNG_OK) { | |
3233 | goto error; | |
3234 | } | |
3235 | } | |
3236 | ||
54d01ffb DG |
3237 | /* Process by command type */ |
3238 | switch (cmd_ctx->lsm->cmd_type) { | |
3239 | case LTTNG_ADD_CONTEXT: | |
3240 | { | |
2001793c JG |
3241 | /* |
3242 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3243 | * payload if the context being added is an application context. | |
3244 | */ | |
3245 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3246 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3247 | char *provider_name = NULL, *context_name = NULL; | |
3248 | size_t provider_name_len = | |
3249 | cmd_ctx->lsm->u.context.provider_name_len; | |
3250 | size_t context_name_len = | |
3251 | cmd_ctx->lsm->u.context.context_name_len; | |
3252 | ||
3253 | if (provider_name_len == 0 || context_name_len == 0) { | |
3254 | /* | |
3255 | * Application provider and context names MUST | |
3256 | * be provided. | |
3257 | */ | |
3258 | ret = -LTTNG_ERR_INVALID; | |
3259 | goto error; | |
3260 | } | |
3261 | ||
3262 | provider_name = zmalloc(provider_name_len + 1); | |
3263 | if (!provider_name) { | |
3264 | ret = -LTTNG_ERR_NOMEM; | |
3265 | goto error; | |
3266 | } | |
e0f4d107 JG |
3267 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3268 | provider_name; | |
2001793c JG |
3269 | |
3270 | context_name = zmalloc(context_name_len + 1); | |
3271 | if (!context_name) { | |
3272 | ret = -LTTNG_ERR_NOMEM; | |
3273 | goto error_add_context; | |
3274 | } | |
e0f4d107 JG |
3275 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3276 | context_name; | |
2001793c JG |
3277 | |
3278 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3279 | provider_name_len); | |
3280 | if (ret < 0) { | |
3281 | goto error_add_context; | |
3282 | } | |
3283 | ||
3284 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3285 | context_name_len); | |
3286 | if (ret < 0) { | |
3287 | goto error_add_context; | |
3288 | } | |
2001793c JG |
3289 | } |
3290 | ||
3291 | /* | |
3292 | * cmd_add_context assumes ownership of the provider and context | |
3293 | * names. | |
3294 | */ | |
3295 | ret = cmd_add_context(cmd_ctx->session, | |
3296 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3297 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3298 | &cmd_ctx->lsm->u.context.ctx, |
3299 | kernel_poll_pipe[1]); | |
3300 | ||
3301 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3302 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3303 | error_add_context: | |
3304 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3305 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3306 | if (ret < 0) { | |
3307 | goto error; | |
3308 | } | |
54d01ffb DG |
3309 | break; |
3310 | } | |
3311 | case LTTNG_DISABLE_CHANNEL: | |
3312 | { | |
3313 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3314 | cmd_ctx->lsm->u.disable.channel_name); | |
3315 | break; | |
3316 | } | |
3317 | case LTTNG_DISABLE_EVENT: | |
3318 | { | |
47b7e2f9 JG |
3319 | |
3320 | /* | |
3321 | * FIXME: handle filter; for now we just receive the filter's | |
3322 | * bytecode along with the filter expression which are sent by | |
3323 | * liblttng-ctl and discard them. | |
3324 | * | |
3325 | * This fixes an issue where the client may block while sending | |
3326 | * the filter payload and encounter an error because the session | |
3327 | * daemon closes the socket without ever handling this data. | |
3328 | */ | |
3329 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3330 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3331 | ||
3332 | if (count) { | |
3333 | char data[LTTNG_FILTER_MAX_LEN]; | |
3334 | ||
3335 | DBG("Discarding disable event command payload of size %zu", count); | |
3336 | while (count) { | |
3337 | ret = lttcomm_recv_unix_sock(sock, data, | |
3338 | count > sizeof(data) ? sizeof(data) : count); | |
3339 | if (ret < 0) { | |
3340 | goto error; | |
3341 | } | |
3342 | ||
3343 | count -= (size_t) ret; | |
3344 | } | |
3345 | } | |
6e911cad | 3346 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3347 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3348 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3349 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3350 | break; |
3351 | } | |
54d01ffb DG |
3352 | case LTTNG_ENABLE_CHANNEL: |
3353 | { | |
b3530820 JG |
3354 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
3355 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
7972aab2 | 3356 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
b3530820 JG |
3357 | &cmd_ctx->lsm->u.channel.chan, |
3358 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3359 | break; |
3360 | } | |
ccf10263 MD |
3361 | case LTTNG_TRACK_PID: |
3362 | { | |
3363 | ret = cmd_track_pid(cmd_ctx->session, | |
3364 | cmd_ctx->lsm->domain.type, | |
3365 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3366 | break; | |
3367 | } | |
3368 | case LTTNG_UNTRACK_PID: | |
3369 | { | |
3370 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3371 | cmd_ctx->lsm->domain.type, | |
3372 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3373 | break; | |
3374 | } | |
54d01ffb DG |
3375 | case LTTNG_ENABLE_EVENT: |
3376 | { | |
dcabc190 | 3377 | struct lttng_event *ev = NULL; |
882ef835 JI |
3378 | struct lttng_event_exclusion *exclusion = NULL; |
3379 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3380 | char *filter_expression = NULL; |
882ef835 | 3381 | |
67676bd8 DG |
3382 | /* Handle exclusion events and receive it from the client. */ |
3383 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3384 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3385 | ||
3386 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3387 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3388 | if (!exclusion) { | |
3389 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3390 | goto error; | |
882ef835 | 3391 | } |
882ef835 | 3392 | |
67676bd8 DG |
3393 | DBG("Receiving var len exclusion event list from client ..."); |
3394 | exclusion->count = count; | |
3395 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3396 | count * LTTNG_SYMBOL_NAME_LEN); | |
3397 | if (ret <= 0) { | |
3398 | DBG("Nothing recv() from client var len data... continuing"); | |
3399 | *sock_error = 1; | |
3400 | free(exclusion); | |
3401 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3402 | goto error; | |
3403 | } | |
3404 | } | |
3405 | ||
6b453b5e JG |
3406 | /* Get filter expression from client. */ |
3407 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3408 | size_t expression_len = | |
3409 | cmd_ctx->lsm->u.enable.expression_len; | |
3410 | ||
3411 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3412 | ret = LTTNG_ERR_FILTER_INVAL; | |
3413 | free(exclusion); | |
3414 | goto error; | |
3415 | } | |
3416 | ||
3417 | filter_expression = zmalloc(expression_len); | |
3418 | if (!filter_expression) { | |
3419 | free(exclusion); | |
3420 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3421 | goto error; | |
3422 | } | |
3423 | ||
3424 | /* Receive var. len. data */ | |
3425 | DBG("Receiving var len filter's expression from client ..."); | |
3426 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3427 | expression_len); | |
3428 | if (ret <= 0) { | |
dcabc190 | 3429 | DBG("Nothing recv() from client var len data... continuing"); |
6b453b5e JG |
3430 | *sock_error = 1; |
3431 | free(filter_expression); | |
3432 | free(exclusion); | |
3433 | ret = LTTNG_ERR_FILTER_INVAL; | |
3434 | goto error; | |
3435 | } | |
3436 | } | |
3437 | ||
67676bd8 DG |
3438 | /* Handle filter and get bytecode from client. */ |
3439 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3440 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3441 | ||
3442 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3443 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3444 | free(filter_expression); |
67676bd8 DG |
3445 | free(exclusion); |
3446 | goto error; | |
3447 | } | |
3448 | ||
3449 | bytecode = zmalloc(bytecode_len); | |
3450 | if (!bytecode) { | |
49d21f93 | 3451 | free(filter_expression); |
67676bd8 DG |
3452 | free(exclusion); |
3453 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3454 | goto error; | |
882ef835 JI |
3455 | } |
3456 | ||
67676bd8 DG |
3457 | /* Receive var. len. data */ |
3458 | DBG("Receiving var len filter's bytecode from client ..."); | |
3459 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3460 | if (ret <= 0) { | |
dcabc190 | 3461 | DBG("Nothing recv() from client var len data... continuing"); |
67676bd8 | 3462 | *sock_error = 1; |
49d21f93 | 3463 | free(filter_expression); |
67676bd8 DG |
3464 | free(bytecode); |
3465 | free(exclusion); | |
3466 | ret = LTTNG_ERR_FILTER_INVAL; | |
3467 | goto error; | |
3468 | } | |
3469 | ||
3470 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3471 | free(filter_expression); |
67676bd8 DG |
3472 | free(bytecode); |
3473 | free(exclusion); | |
3474 | ret = LTTNG_ERR_FILTER_INVAL; | |
3475 | goto error; | |
3476 | } | |
882ef835 | 3477 | } |
67676bd8 | 3478 | |
dcabc190 FD |
3479 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); |
3480 | if (!ev) { | |
3481 | DBG("Failed to copy event: %s", | |
3482 | cmd_ctx->lsm->u.enable.event.name); | |
5ae0c80e JG |
3483 | free(filter_expression); |
3484 | free(bytecode); | |
3485 | free(exclusion); | |
dcabc190 FD |
3486 | ret = LTTNG_ERR_NOMEM; |
3487 | goto error; | |
3488 | } | |
3489 | ||
3490 | ||
3491 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
3492 | /* Expect a userspace probe description. */ | |
3493 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); | |
3494 | if (ret) { | |
5ae0c80e JG |
3495 | free(filter_expression); |
3496 | free(bytecode); | |
3497 | free(exclusion); | |
dcabc190 FD |
3498 | lttng_event_destroy(ev); |
3499 | goto error; | |
3500 | } | |
3501 | } | |
3502 | ||
67676bd8 DG |
3503 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
3504 | cmd_ctx->lsm->u.enable.channel_name, | |
dcabc190 | 3505 | ev, |
6b453b5e | 3506 | filter_expression, bytecode, exclusion, |
67676bd8 | 3507 | kernel_poll_pipe[1]); |
dcabc190 | 3508 | lttng_event_destroy(ev); |
54d01ffb DG |
3509 | break; |
3510 | } | |
052da939 | 3511 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3512 | { |
9f19cc17 | 3513 | struct lttng_event *events; |
54d01ffb | 3514 | ssize_t nb_events; |
052da939 | 3515 | |
0845bbfa | 3516 | session_lock_list(); |
54d01ffb | 3517 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3518 | session_unlock_list(); |
54d01ffb | 3519 | if (nb_events < 0) { |
f73fabfd | 3520 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3521 | ret = -nb_events; |
3522 | goto error; | |
2ef84c95 DG |
3523 | } |
3524 | ||
3525 | /* | |
3526 | * Setup lttng message with payload size set to the event list size in | |
3527 | * bytes and then copy list into the llm payload. | |
3528 | */ | |
6e10c9b9 PP |
3529 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3530 | sizeof(struct lttng_event) * nb_events); | |
3531 | free(events); | |
3532 | ||
2ef84c95 DG |
3533 | if (ret < 0) { |
3534 | goto setup_error; | |
3535 | } | |
3536 | ||
f73fabfd | 3537 | ret = LTTNG_OK; |
2ef84c95 DG |
3538 | break; |
3539 | } | |
f37d259d MD |
3540 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3541 | { | |
3542 | struct lttng_event_field *fields; | |
3543 | ssize_t nb_fields; | |
3544 | ||
0845bbfa | 3545 | session_lock_list(); |
a4b92340 DG |
3546 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3547 | &fields); | |
0845bbfa | 3548 | session_unlock_list(); |
f37d259d | 3549 | if (nb_fields < 0) { |
f73fabfd | 3550 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3551 | ret = -nb_fields; |
3552 | goto error; | |
3553 | } | |
3554 | ||
3555 | /* | |
3556 | * Setup lttng message with payload size set to the event list size in | |
3557 | * bytes and then copy list into the llm payload. | |
3558 | */ | |
6e10c9b9 | 3559 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3560 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3561 | free(fields); |
3562 | ||
f37d259d | 3563 | if (ret < 0) { |
f37d259d MD |
3564 | goto setup_error; |
3565 | } | |
3566 | ||
f73fabfd | 3567 | ret = LTTNG_OK; |
f37d259d MD |
3568 | break; |
3569 | } | |
834978fd DG |
3570 | case LTTNG_LIST_SYSCALLS: |
3571 | { | |
3572 | struct lttng_event *events; | |
3573 | ssize_t nb_events; | |
3574 | ||
3575 | nb_events = cmd_list_syscalls(&events); | |
3576 | if (nb_events < 0) { | |
3577 | /* Return value is a negative lttng_error_code. */ | |
3578 | ret = -nb_events; | |
3579 | goto error; | |
3580 | } | |
3581 | ||
3582 | /* | |
3583 | * Setup lttng message with payload size set to the event list size in | |
3584 | * bytes and then copy list into the llm payload. | |
3585 | */ | |
6e10c9b9 PP |
3586 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3587 | sizeof(struct lttng_event) * nb_events); | |
3588 | free(events); | |
3589 | ||
834978fd | 3590 | if (ret < 0) { |
834978fd DG |
3591 | goto setup_error; |
3592 | } | |
3593 | ||
834978fd DG |
3594 | ret = LTTNG_OK; |
3595 | break; | |
3596 | } | |
a5dfbb9d MD |
3597 | case LTTNG_LIST_TRACKER_PIDS: |
3598 | { | |
3599 | int32_t *pids = NULL; | |
3600 | ssize_t nr_pids; | |
3601 | ||
3602 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3603 | cmd_ctx->lsm->domain.type, &pids); | |
3604 | if (nr_pids < 0) { | |
3605 | /* Return value is a negative lttng_error_code. */ | |
3606 | ret = -nr_pids; | |
3607 | goto error; | |
3608 | } | |
3609 | ||
3610 | /* | |
3611 | * Setup lttng message with payload size set to the event list size in | |
3612 | * bytes and then copy list into the llm payload. | |
3613 | */ | |
6e10c9b9 PP |
3614 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3615 | sizeof(int32_t) * nr_pids); | |
3616 | free(pids); | |
3617 | ||
a5dfbb9d | 3618 | if (ret < 0) { |
a5dfbb9d MD |
3619 | goto setup_error; |
3620 | } | |
3621 | ||
a5dfbb9d MD |
3622 | ret = LTTNG_OK; |
3623 | break; | |
3624 | } | |
00e2e675 DG |
3625 | case LTTNG_SET_CONSUMER_URI: |
3626 | { | |
a4b92340 DG |
3627 | size_t nb_uri, len; |
3628 | struct lttng_uri *uris; | |
3629 | ||
3630 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3631 | len = nb_uri * sizeof(struct lttng_uri); | |
3632 | ||
3633 | if (nb_uri == 0) { | |
f73fabfd | 3634 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3635 | goto error; |
3636 | } | |
3637 | ||
3638 | uris = zmalloc(len); | |
3639 | if (uris == NULL) { | |
f73fabfd | 3640 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3641 | goto error; |
3642 | } | |
3643 | ||
3644 | /* Receive variable len data */ | |
77c7c900 | 3645 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3646 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3647 | if (ret <= 0) { | |
3648 | DBG("No URIs received from client... continuing"); | |
3649 | *sock_error = 1; | |
f73fabfd | 3650 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3651 | free(uris); |
a4b92340 DG |
3652 | goto error; |
3653 | } | |
3654 | ||
bda32d56 JG |
3655 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3656 | free(uris); | |
f73fabfd | 3657 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3658 | goto error; |
3659 | } | |
3660 | ||
b1d41407 | 3661 | |
00e2e675 DG |
3662 | break; |
3663 | } | |
f3ed775e | 3664 | case LTTNG_START_TRACE: |
8c0faa1d | 3665 | { |
259c2674 JD |
3666 | /* |
3667 | * On the first start, if we have a kernel session and we have | |
3668 | * enabled time or size-based rotations, we have to make sure | |
3669 | * the kernel tracer supports it. | |
3670 | */ | |
3671 | if (!cmd_ctx->session->has_been_started && \ | |
3672 | cmd_ctx->session->kernel_session && \ | |
3673 | (cmd_ctx->session->rotate_timer_period || \ | |
3674 | cmd_ctx->session->rotate_size) && \ | |
3675 | !check_rotate_compatible()) { | |
3676 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
3677 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
3678 | goto error; | |
3679 | } | |
54d01ffb | 3680 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3681 | break; |
3682 | } | |
f3ed775e | 3683 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3684 | { |
54d01ffb | 3685 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3686 | break; |
3687 | } | |
5e16da05 MD |
3688 | case LTTNG_CREATE_SESSION: |
3689 | { | |
a4b92340 DG |
3690 | size_t nb_uri, len; |
3691 | struct lttng_uri *uris = NULL; | |
3692 | ||
3693 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3694 | len = nb_uri * sizeof(struct lttng_uri); | |
3695 | ||
3696 | if (nb_uri > 0) { | |
3697 | uris = zmalloc(len); | |
3698 | if (uris == NULL) { | |
f73fabfd | 3699 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3700 | goto error; |
3701 | } | |
3702 | ||
3703 | /* Receive variable len data */ | |
77c7c900 | 3704 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3705 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3706 | if (ret <= 0) { | |
3707 | DBG("No URIs received from client... continuing"); | |
3708 | *sock_error = 1; | |
f73fabfd | 3709 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3710 | free(uris); |
a4b92340 DG |
3711 | goto error; |
3712 | } | |
3713 | ||
3714 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3715 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3716 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3717 | free(uris); |
a4b92340 DG |
3718 | goto error; |
3719 | } | |
3720 | } | |
3721 | ||
3722 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3723 | &cmd_ctx->creds, 0); |
a4b92340 | 3724 | |
b1d41407 DG |
3725 | free(uris); |
3726 | ||
00e2e675 DG |
3727 | break; |
3728 | } | |
5e16da05 MD |
3729 | case LTTNG_DESTROY_SESSION: |
3730 | { | |
90936dcf JD |
3731 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1], |
3732 | notification_thread_handle); | |
a4b92340 DG |
3733 | |
3734 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3735 | cmd_ctx->session = NULL; |
5461b305 | 3736 | break; |
5e16da05 | 3737 | } |
9f19cc17 | 3738 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3739 | { |
54d01ffb | 3740 | ssize_t nb_dom; |
fa64dfb4 | 3741 | struct lttng_domain *domains = NULL; |
5461b305 | 3742 | |
54d01ffb DG |
3743 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3744 | if (nb_dom < 0) { | |
f73fabfd | 3745 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3746 | ret = -nb_dom; |
3747 | goto error; | |
ce3d728c | 3748 | } |
520ff687 | 3749 | |
6e10c9b9 PP |
3750 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3751 | nb_dom * sizeof(struct lttng_domain)); | |
3752 | free(domains); | |
3753 | ||
5461b305 DG |
3754 | if (ret < 0) { |
3755 | goto setup_error; | |
520ff687 | 3756 | } |
57167058 | 3757 | |
f73fabfd | 3758 | ret = LTTNG_OK; |
5e16da05 MD |
3759 | break; |
3760 | } | |
9f19cc17 | 3761 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3762 | { |
53e367f9 | 3763 | ssize_t payload_size; |
ade7ce52 | 3764 | struct lttng_channel *channels = NULL; |
54d01ffb | 3765 | |
53e367f9 | 3766 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3767 | cmd_ctx->session, &channels); |
53e367f9 | 3768 | if (payload_size < 0) { |
f73fabfd | 3769 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3770 | ret = -payload_size; |
54d01ffb | 3771 | goto error; |
5461b305 | 3772 | } |
ca95a216 | 3773 | |
6e10c9b9 | 3774 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3775 | payload_size); |
6e10c9b9 PP |
3776 | free(channels); |
3777 | ||
5461b305 DG |
3778 | if (ret < 0) { |
3779 | goto setup_error; | |
3780 | } | |
9f19cc17 | 3781 | |
f73fabfd | 3782 | ret = LTTNG_OK; |
5461b305 | 3783 | break; |
5e16da05 | 3784 | } |
9f19cc17 | 3785 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3786 | { |
b551a063 | 3787 | ssize_t nb_event; |
684d34d2 | 3788 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3789 | struct lttcomm_event_command_header cmd_header; |
3790 | size_t total_size; | |
3791 | ||
b2d66287 | 3792 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3793 | /* Extended infos are included at the end of events */ |
3794 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3795 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3796 | &events, &total_size); | |
9f19cc17 | 3797 | |
54d01ffb | 3798 | if (nb_event < 0) { |
f73fabfd | 3799 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3800 | ret = -nb_event; |
3801 | goto error; | |
5461b305 | 3802 | } |
ca95a216 | 3803 | |
b4e3ceb9 PP |
3804 | cmd_header.nb_events = nb_event; |
3805 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3806 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3807 | free(events); |
3808 | ||
5461b305 DG |
3809 | if (ret < 0) { |
3810 | goto setup_error; | |
3811 | } | |
9f19cc17 | 3812 | |
f73fabfd | 3813 | ret = LTTNG_OK; |
5461b305 | 3814 | break; |
5e16da05 MD |
3815 | } |
3816 | case LTTNG_LIST_SESSIONS: | |
3817 | { | |
8e0af1b4 | 3818 | unsigned int nr_sessions; |
6e10c9b9 PP |
3819 | void *sessions_payload; |
3820 | size_t payload_len; | |
5461b305 | 3821 | |
8e0af1b4 | 3822 | session_lock_list(); |
730389d9 DG |
3823 | nr_sessions = lttng_sessions_count( |
3824 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3825 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
3826 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
3827 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 3828 | |
6e10c9b9 | 3829 | if (!sessions_payload) { |
54d01ffb | 3830 | session_unlock_list(); |
6e10c9b9 | 3831 | ret = -ENOMEM; |
5461b305 | 3832 | goto setup_error; |
e065084a | 3833 | } |
5e16da05 | 3834 | |
6e10c9b9 | 3835 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
3836 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3837 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 3838 | session_unlock_list(); |
5e16da05 | 3839 | |
6e10c9b9 PP |
3840 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
3841 | payload_len); | |
3842 | free(sessions_payload); | |
3843 | ||
3844 | if (ret < 0) { | |
3845 | goto setup_error; | |
3846 | } | |
3847 | ||
f73fabfd | 3848 | ret = LTTNG_OK; |
5e16da05 MD |
3849 | break; |
3850 | } | |
d9800920 DG |
3851 | case LTTNG_REGISTER_CONSUMER: |
3852 | { | |
2f77fc4b DG |
3853 | struct consumer_data *cdata; |
3854 | ||
3855 | switch (cmd_ctx->lsm->domain.type) { | |
3856 | case LTTNG_DOMAIN_KERNEL: | |
3857 | cdata = &kconsumer_data; | |
3858 | break; | |
3859 | default: | |
f73fabfd | 3860 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3861 | goto error; |
3862 | } | |
3863 | ||
54d01ffb | 3864 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3865 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3866 | break; |
3867 | } | |
6d805429 | 3868 | case LTTNG_DATA_PENDING: |
806e2684 | 3869 | { |
f6151c55 | 3870 | int pending_ret; |
6e10c9b9 | 3871 | uint8_t pending_ret_byte; |
f6151c55 JG |
3872 | |
3873 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 3874 | |
f6151c55 JG |
3875 | /* |
3876 | * FIXME | |
3877 | * | |
3878 | * This function may returns 0 or 1 to indicate whether or not | |
3879 | * there is data pending. In case of error, it should return an | |
3880 | * LTTNG_ERR code. However, some code paths may still return | |
3881 | * a nondescript error code, which we handle by returning an | |
3882 | * "unknown" error. | |
3883 | */ | |
3884 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
3885 | /* |
3886 | * ret will be set to LTTNG_OK at the end of | |
3887 | * this function. | |
3888 | */ | |
f6151c55 JG |
3889 | } else if (pending_ret < 0) { |
3890 | ret = LTTNG_ERR_UNK; | |
3891 | goto setup_error; | |
3892 | } else { | |
3893 | ret = pending_ret; | |
3894 | goto setup_error; | |
3895 | } | |
3896 | ||
6e10c9b9 PP |
3897 | pending_ret_byte = (uint8_t) pending_ret; |
3898 | ||
3899 | /* 1 byte to return whether or not data is pending */ | |
3900 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
3901 | &pending_ret_byte, 1); | |
3902 | ||
3903 | if (ret < 0) { | |
3904 | goto setup_error; | |
3905 | } | |
3906 | ||
3907 | ret = LTTNG_OK; | |
806e2684 DG |
3908 | break; |
3909 | } | |
da3c9ec1 DG |
3910 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3911 | { | |
6dc3064a DG |
3912 | struct lttcomm_lttng_output_id reply; |
3913 | ||
3914 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3915 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3916 | if (ret != LTTNG_OK) { | |
3917 | goto error; | |
3918 | } | |
3919 | ||
6e10c9b9 PP |
3920 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
3921 | sizeof(reply)); | |
6dc3064a DG |
3922 | if (ret < 0) { |
3923 | goto setup_error; | |
3924 | } | |
3925 | ||
3926 | /* Copy output list into message payload */ | |
6dc3064a | 3927 | ret = LTTNG_OK; |
da3c9ec1 DG |
3928 | break; |
3929 | } | |
3930 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3931 | { | |
6dc3064a DG |
3932 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3933 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3934 | break; |
3935 | } | |
3936 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3937 | { | |
6dc3064a DG |
3938 | ssize_t nb_output; |
3939 | struct lttng_snapshot_output *outputs = NULL; | |
3940 | ||
3941 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3942 | if (nb_output < 0) { | |
3943 | ret = -nb_output; | |
3944 | goto error; | |
3945 | } | |
3946 | ||
6e10c9b9 PP |
3947 | assert((nb_output > 0 && outputs) || nb_output == 0); |
3948 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 3949 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
3950 | free(outputs); |
3951 | ||
6dc3064a | 3952 | if (ret < 0) { |
6dc3064a DG |
3953 | goto setup_error; |
3954 | } | |
3955 | ||
6dc3064a | 3956 | ret = LTTNG_OK; |
da3c9ec1 DG |
3957 | break; |
3958 | } | |
3959 | case LTTNG_SNAPSHOT_RECORD: | |
3960 | { | |
6dc3064a DG |
3961 | ret = cmd_snapshot_record(cmd_ctx->session, |
3962 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3963 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3964 | break; |
3965 | } | |
27babd3a DG |
3966 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3967 | { | |
3968 | size_t nb_uri, len; | |
3969 | struct lttng_uri *uris = NULL; | |
3970 | ||
3971 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3972 | len = nb_uri * sizeof(struct lttng_uri); | |
3973 | ||
3974 | if (nb_uri > 0) { | |
3975 | uris = zmalloc(len); | |
3976 | if (uris == NULL) { | |
3977 | ret = LTTNG_ERR_FATAL; | |
3978 | goto error; | |
3979 | } | |
3980 | ||
3981 | /* Receive variable len data */ | |
3982 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3983 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3984 | if (ret <= 0) { | |
3985 | DBG("No URIs received from client... continuing"); | |
3986 | *sock_error = 1; | |
3987 | ret = LTTNG_ERR_SESSION_FAIL; | |
3988 | free(uris); | |
3989 | goto error; | |
3990 | } | |
3991 | ||
3992 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3993 | DBG("Creating session with ONE network URI is a bad call"); | |
3994 | ret = LTTNG_ERR_SESSION_FAIL; | |
3995 | free(uris); | |
3996 | goto error; | |
3997 | } | |
3998 | } | |
3999 | ||
4000 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
4001 | nb_uri, &cmd_ctx->creds); | |
4002 | free(uris); | |
4003 | break; | |
4004 | } | |
ecc48a90 JD |
4005 | case LTTNG_CREATE_SESSION_LIVE: |
4006 | { | |
4007 | size_t nb_uri, len; | |
4008 | struct lttng_uri *uris = NULL; | |
4009 | ||
4010 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4011 | len = nb_uri * sizeof(struct lttng_uri); | |
4012 | ||
4013 | if (nb_uri > 0) { | |
4014 | uris = zmalloc(len); | |
4015 | if (uris == NULL) { | |
4016 | ret = LTTNG_ERR_FATAL; | |
4017 | goto error; | |
4018 | } | |
4019 | ||
4020 | /* Receive variable len data */ | |
4021 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4022 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4023 | if (ret <= 0) { | |
4024 | DBG("No URIs received from client... continuing"); | |
4025 | *sock_error = 1; | |
4026 | ret = LTTNG_ERR_SESSION_FAIL; | |
4027 | free(uris); | |
4028 | goto error; | |
4029 | } | |
4030 | ||
4031 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4032 | DBG("Creating session with ONE network URI is a bad call"); | |
4033 | ret = LTTNG_ERR_SESSION_FAIL; | |
4034 | free(uris); | |
4035 | goto error; | |
4036 | } | |
4037 | } | |
4038 | ||
4039 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4040 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4041 | free(uris); | |
4042 | break; | |
4043 | } | |
fb198a11 JG |
4044 | case LTTNG_SAVE_SESSION: |
4045 | { | |
4046 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4047 | &cmd_ctx->creds); | |
4048 | break; | |
4049 | } | |
d7ba1388 MD |
4050 | case LTTNG_SET_SESSION_SHM_PATH: |
4051 | { | |
4052 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4053 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4054 | break; | |
4055 | } | |
eded6438 | 4056 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4057 | { |
eded6438 | 4058 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4059 | break; |
4060 | } | |
c2561365 JD |
4061 | case LTTNG_REGENERATE_STATEDUMP: |
4062 | { | |
4063 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4064 | break; | |
4065 | } | |
b3530820 JG |
4066 | case LTTNG_REGISTER_TRIGGER: |
4067 | { | |
4068 | ret = cmd_register_trigger(cmd_ctx, sock, | |
4069 | notification_thread_handle); | |
4070 | break; | |
4071 | } | |
4072 | case LTTNG_UNREGISTER_TRIGGER: | |
4073 | { | |
4074 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
4075 | notification_thread_handle); | |
4076 | break; | |
4077 | } | |
5c408ad8 JD |
4078 | case LTTNG_ROTATE_SESSION: |
4079 | { | |
4080 | struct lttng_rotate_session_return rotate_return; | |
4081 | ||
4082 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
4083 | ||
d68c9a04 | 4084 | memset(&rotate_return, 0, sizeof(rotate_return)); |
5c408ad8 JD |
4085 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4086 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
4087 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4088 | goto error; | |
4089 | } | |
4090 | ||
4091 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); | |
4092 | if (ret < 0) { | |
4093 | ret = -ret; | |
4094 | goto error; | |
4095 | } | |
4096 | ||
4097 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
4098 | sizeof(rotate_return)); | |
4099 | if (ret < 0) { | |
4100 | ret = -ret; | |
4101 | goto error; | |
4102 | } | |
4103 | ||
4104 | ret = LTTNG_OK; | |
4105 | break; | |
4106 | } | |
d68c9a04 | 4107 | case LTTNG_ROTATION_GET_INFO: |
5c408ad8 | 4108 | { |
d68c9a04 | 4109 | struct lttng_rotation_get_info_return get_info_return; |
5c408ad8 | 4110 | |
d68c9a04 JD |
4111 | memset(&get_info_return, 0, sizeof(get_info_return)); |
4112 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
4113 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
5c408ad8 JD |
4114 | if (ret < 0) { |
4115 | ret = -ret; | |
4116 | goto error; | |
4117 | } | |
4118 | ||
d68c9a04 JD |
4119 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
4120 | sizeof(get_info_return)); | |
5c408ad8 JD |
4121 | if (ret < 0) { |
4122 | ret = -ret; | |
4123 | goto error; | |
4124 | } | |
4125 | ||
4126 | ret = LTTNG_OK; | |
4127 | break; | |
4128 | } | |
259c2674 JD |
4129 | case LTTNG_ROTATION_SET_SCHEDULE: |
4130 | { | |
66ea93b1 JG |
4131 | bool set_schedule; |
4132 | enum lttng_rotation_schedule_type schedule_type; | |
4133 | uint64_t value; | |
4134 | ||
259c2674 JD |
4135 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4136 | DBG("Kernel tracer version does not support session rotations"); | |
4137 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4138 | goto error; | |
4139 | } | |
4140 | ||
66ea93b1 JG |
4141 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
4142 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
4143 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
4144 | ||
259c2674 | 4145 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
66ea93b1 JG |
4146 | set_schedule, |
4147 | schedule_type, | |
4148 | value, | |
90936dcf | 4149 | notification_thread_handle); |
a2026546 | 4150 | if (ret != LTTNG_OK) { |
259c2674 JD |
4151 | goto error; |
4152 | } | |
4153 | ||
259c2674 JD |
4154 | break; |
4155 | } | |
66ea93b1 | 4156 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
329f3443 | 4157 | { |
66ea93b1 JG |
4158 | struct lttng_session_list_schedules_return schedules = { |
4159 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
4160 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
4161 | .size.set = !!cmd_ctx->session->rotate_size, | |
4162 | .size.value = cmd_ctx->session->rotate_size, | |
4163 | }; | |
4164 | ||
4165 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
4166 | sizeof(schedules)); | |
329f3443 JD |
4167 | if (ret < 0) { |
4168 | ret = -ret; | |
4169 | goto error; | |
4170 | } | |
4171 | ||
4172 | ret = LTTNG_OK; | |
4173 | break; | |
4174 | } | |
5e16da05 | 4175 | default: |
f73fabfd | 4176 | ret = LTTNG_ERR_UND; |
5461b305 | 4177 | break; |
fac6795d DG |
4178 | } |
4179 | ||
5461b305 | 4180 | error: |
5461b305 DG |
4181 | if (cmd_ctx->llm == NULL) { |
4182 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4183 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4184 | goto setup_error; |
4185 | } | |
4186 | } | |
54d01ffb | 4187 | /* Set return code */ |
5461b305 | 4188 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4189 | setup_error: |
b5541356 | 4190 | if (cmd_ctx->session) { |
54d01ffb | 4191 | session_unlock(cmd_ctx->session); |
b5541356 | 4192 | } |
256a5576 MD |
4193 | if (need_tracing_session) { |
4194 | session_unlock_list(); | |
4195 | } | |
54d01ffb | 4196 | init_setup_error: |
3745d315 | 4197 | assert(!rcu_read_ongoing()); |
8028d920 | 4198 | return ret; |
fac6795d DG |
4199 | } |
4200 | ||
44a5e5eb DG |
4201 | /* |
4202 | * Thread managing health check socket. | |
4203 | */ | |
4204 | static void *thread_manage_health(void *data) | |
4205 | { | |
eb4a2943 | 4206 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4207 | uint32_t revents, nb_fd; |
4208 | struct lttng_poll_event events; | |
0c89d795 MD |
4209 | struct health_comm_msg msg; |
4210 | struct health_comm_reply reply; | |
44a5e5eb DG |
4211 | |
4212 | DBG("[thread] Manage health check started"); | |
4213 | ||
4214 | rcu_register_thread(); | |
4215 | ||
6d737ce4 DG |
4216 | /* We might hit an error path before this is created. */ |
4217 | lttng_poll_init(&events); | |
3cc04881 | 4218 | |
44a5e5eb | 4219 | /* Create unix socket */ |
e6142f2e | 4220 | sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value); |
44a5e5eb DG |
4221 | if (sock < 0) { |
4222 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4223 | goto error; |
4224 | } | |
4225 | ||
6c71277b MD |
4226 | if (is_root) { |
4227 | /* lttng health client socket path permissions */ | |
e6142f2e JG |
4228 | ret = chown(config.health_unix_sock_path.value, 0, |
4229 | utils_get_group_id(config.tracing_group_name.value)); | |
6c71277b | 4230 | if (ret < 0) { |
e6142f2e | 4231 | ERR("Unable to set group on %s", config.health_unix_sock_path.value); |
6c71277b | 4232 | PERROR("chown"); |
6c71277b MD |
4233 | goto error; |
4234 | } | |
4235 | ||
e6142f2e | 4236 | ret = chmod(config.health_unix_sock_path.value, |
6c71277b MD |
4237 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
4238 | if (ret < 0) { | |
e6142f2e | 4239 | ERR("Unable to set permissions on %s", config.health_unix_sock_path.value); |
6c71277b | 4240 | PERROR("chmod"); |
6c71277b MD |
4241 | goto error; |
4242 | } | |
4243 | } | |
4244 | ||
b662582b DG |
4245 | /* |
4246 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4247 | * show must go on. | |
4248 | */ | |
4249 | (void) utils_set_fd_cloexec(sock); | |
4250 | ||
44a5e5eb DG |
4251 | ret = lttcomm_listen_unix_sock(sock); |
4252 | if (ret < 0) { | |
4253 | goto error; | |
4254 | } | |
4255 | ||
4256 | /* | |
4257 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4258 | * more will be added to this poll set. | |
4259 | */ | |
d0b96690 | 4260 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4261 | if (ret < 0) { |
4262 | goto error; | |
4263 | } | |
4264 | ||
4265 | /* Add the application registration socket */ | |
4266 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4267 | if (ret < 0) { | |
4268 | goto error; | |
4269 | } | |
4270 | ||
ef367a93 | 4271 | sessiond_notify_ready(); |
97bc1426 | 4272 | |
44a5e5eb DG |
4273 | while (1) { |
4274 | DBG("Health check ready"); | |
4275 | ||
44a5e5eb DG |
4276 | /* Inifinite blocking call, waiting for transmission */ |
4277 | restart: | |
4278 | ret = lttng_poll_wait(&events, -1); | |
4279 | if (ret < 0) { | |
4280 | /* | |
4281 | * Restart interrupted system call. | |
4282 | */ | |
4283 | if (errno == EINTR) { | |
4284 | goto restart; | |
4285 | } | |
4286 | goto error; | |
4287 | } | |
4288 | ||
0d9c5d77 DG |
4289 | nb_fd = ret; |
4290 | ||
44a5e5eb DG |
4291 | for (i = 0; i < nb_fd; i++) { |
4292 | /* Fetch once the poll data */ | |
4293 | revents = LTTNG_POLL_GETEV(&events, i); | |
4294 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4295 | ||
fd20dac9 MD |
4296 | if (!revents) { |
4297 | /* No activity for this FD (poll implementation). */ | |
4298 | continue; | |
4299 | } | |
4300 | ||
44a5e5eb | 4301 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4302 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4303 | if (ret) { |
139ac872 MD |
4304 | err = 0; |
4305 | goto exit; | |
44a5e5eb DG |
4306 | } |
4307 | ||
4308 | /* Event on the registration socket */ | |
4309 | if (pollfd == sock) { | |
03e43155 MD |
4310 | if (revents & LPOLLIN) { |
4311 | continue; | |
4312 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4313 | ERR("Health socket poll error"); |
4314 | goto error; | |
03e43155 MD |
4315 | } else { |
4316 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4317 | goto error; | |
44a5e5eb DG |
4318 | } |
4319 | } | |
4320 | } | |
4321 | ||
4322 | new_sock = lttcomm_accept_unix_sock(sock); | |
4323 | if (new_sock < 0) { | |
4324 | goto error; | |
4325 | } | |
4326 | ||
b662582b DG |
4327 | /* |
4328 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4329 | * show must go on. | |
4330 | */ | |
4331 | (void) utils_set_fd_cloexec(new_sock); | |
4332 | ||
44a5e5eb DG |
4333 | DBG("Receiving data from client for health..."); |
4334 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4335 | if (ret <= 0) { | |
4336 | DBG("Nothing recv() from client... continuing"); | |
4337 | ret = close(new_sock); | |
4338 | if (ret) { | |
4339 | PERROR("close"); | |
4340 | } | |
44a5e5eb DG |
4341 | continue; |
4342 | } | |
4343 | ||
4344 | rcu_thread_online(); | |
4345 | ||
53efb85a | 4346 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4347 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4348 | /* | |
4349 | * health_check_state returns 0 if health is | |
4350 | * bad. | |
4351 | */ | |
4352 | if (!health_check_state(health_sessiond, i)) { | |
4353 | reply.ret_code |= 1ULL << i; | |
4354 | } | |
44a5e5eb DG |
4355 | } |
4356 | ||
6c71277b | 4357 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4358 | |
4359 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4360 | if (ret < 0) { | |
4361 | ERR("Failed to send health data back to client"); | |
4362 | } | |
4363 | ||
4364 | /* End of transmission */ | |
4365 | ret = close(new_sock); | |
4366 | if (ret) { | |
4367 | PERROR("close"); | |
4368 | } | |
44a5e5eb DG |
4369 | } |
4370 | ||
139ac872 | 4371 | exit: |
44a5e5eb | 4372 | error: |
139ac872 MD |
4373 | if (err) { |
4374 | ERR("Health error occurred in %s", __func__); | |
4375 | } | |
44a5e5eb | 4376 | DBG("Health check thread dying"); |
e6142f2e | 4377 | unlink(config.health_unix_sock_path.value); |
44a5e5eb DG |
4378 | if (sock >= 0) { |
4379 | ret = close(sock); | |
4380 | if (ret) { | |
4381 | PERROR("close"); | |
4382 | } | |
4383 | } | |
44a5e5eb DG |
4384 | |
4385 | lttng_poll_clean(&events); | |
b11d6a7f | 4386 | stop_threads(); |
44a5e5eb DG |
4387 | rcu_unregister_thread(); |
4388 | return NULL; | |
4389 | } | |
4390 | ||
1d4b027a | 4391 | /* |
d063d709 DG |
4392 | * This thread manage all clients request using the unix client socket for |
4393 | * communication. | |
1d4b027a DG |
4394 | */ |
4395 | static void *thread_manage_clients(void *data) | |
4396 | { | |
139ac872 | 4397 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4398 | int sock_error; |
5eb91c98 | 4399 | uint32_t revents, nb_fd; |
273ea72c | 4400 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4401 | struct lttng_poll_event events; |
1d4b027a DG |
4402 | |
4403 | DBG("[thread] Manage client started"); | |
4404 | ||
f6a9efaa DG |
4405 | rcu_register_thread(); |
4406 | ||
6c71277b | 4407 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4408 | |
840cb59c | 4409 | health_code_update(); |
44a5e5eb | 4410 | |
1d4b027a DG |
4411 | ret = lttcomm_listen_unix_sock(client_sock); |
4412 | if (ret < 0) { | |
35df2755 | 4413 | goto error_listen; |
1d4b027a DG |
4414 | } |
4415 | ||
5eb91c98 DG |
4416 | /* |
4417 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4418 | * more will be added to this poll set. | |
4419 | */ | |
d0b96690 | 4420 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4421 | if (ret < 0) { |
35df2755 | 4422 | goto error_create_poll; |
5eb91c98 | 4423 | } |
273ea72c | 4424 | |
5eb91c98 DG |
4425 | /* Add the application registration socket */ |
4426 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4427 | if (ret < 0) { | |
4428 | goto error; | |
4429 | } | |
273ea72c | 4430 | |
ef367a93 JG |
4431 | ret = sem_post(&load_info->message_thread_ready); |
4432 | if (ret) { | |
4433 | PERROR("sem_post message_thread_ready"); | |
4434 | goto error; | |
4435 | } | |
0bb7724a | 4436 | |
f28f9e44 JG |
4437 | /* |
4438 | * Wait until all support threads are initialized before accepting | |
4439 | * commands. | |
4440 | */ | |
4441 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
f28f9e44 JG |
4442 | /* |
4443 | * If a support thread failed to launch, it may signal that | |
4444 | * we must exit and the sessiond would never be marked as | |
4445 | * "ready". | |
4446 | * | |
4447 | * The timeout is set to 1ms, which serves as a way to | |
4448 | * pace down this check. | |
4449 | */ | |
a7333da7 JG |
4450 | ret = sessiond_wait_for_quit_pipe(1000); |
4451 | if (ret > 0) { | |
f28f9e44 JG |
4452 | goto exit; |
4453 | } | |
4454 | } | |
8b0d4636 JG |
4455 | /* |
4456 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4457 | * ensure that loads accessing data initialized by the other threads, | |
4458 | * on which this thread was waiting, are not performed before this point. | |
4459 | * | |
4460 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4461 | * is used in case the code changes. The performance implications of | |
4462 | * this choice are minimal since this is a slow path. | |
4463 | */ | |
4464 | cmm_smp_mb(); | |
f28f9e44 | 4465 | |
72453c8c MD |
4466 | /* This testpoint is after we signal readiness to the parent. */ |
4467 | if (testpoint(sessiond_thread_manage_clients)) { | |
4468 | goto error; | |
4469 | } | |
4470 | ||
e547b070 | 4471 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4472 | goto error; |
4473 | } | |
8ac94142 | 4474 | |
840cb59c | 4475 | health_code_update(); |
44a5e5eb | 4476 | |
1d4b027a | 4477 | while (1) { |
a503e1ef JG |
4478 | const struct cmd_completion_handler *cmd_completion_handler; |
4479 | ||
1d4b027a | 4480 | DBG("Accepting client command ..."); |
273ea72c DG |
4481 | |
4482 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4483 | restart: |
a78af745 | 4484 | health_poll_entry(); |
5eb91c98 | 4485 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4486 | health_poll_exit(); |
273ea72c | 4487 | if (ret < 0) { |
88f2b785 MD |
4488 | /* |
4489 | * Restart interrupted system call. | |
4490 | */ | |
4491 | if (errno == EINTR) { | |
4492 | goto restart; | |
4493 | } | |
273ea72c DG |
4494 | goto error; |
4495 | } | |
4496 | ||
0d9c5d77 DG |
4497 | nb_fd = ret; |
4498 | ||
5eb91c98 DG |
4499 | for (i = 0; i < nb_fd; i++) { |
4500 | /* Fetch once the poll data */ | |
4501 | revents = LTTNG_POLL_GETEV(&events, i); | |
4502 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4503 | ||
840cb59c | 4504 | health_code_update(); |
44a5e5eb | 4505 | |
fd20dac9 MD |
4506 | if (!revents) { |
4507 | /* No activity for this FD (poll implementation). */ | |
4508 | continue; | |
4509 | } | |
4510 | ||
5eb91c98 | 4511 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4512 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4513 | if (ret) { |
139ac872 MD |
4514 | err = 0; |
4515 | goto exit; | |
5eb91c98 DG |
4516 | } |
4517 | ||
4518 | /* Event on the registration socket */ | |
4519 | if (pollfd == client_sock) { | |
03e43155 MD |
4520 | if (revents & LPOLLIN) { |
4521 | continue; | |
4522 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4523 | ERR("Client socket poll error"); |
4524 | goto error; | |
03e43155 MD |
4525 | } else { |
4526 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4527 | goto error; | |
5eb91c98 DG |
4528 | } |
4529 | } | |
4530 | } | |
4531 | ||
4532 | DBG("Wait for client response"); | |
4533 | ||
840cb59c | 4534 | health_code_update(); |
44a5e5eb | 4535 | |
5eb91c98 DG |
4536 | sock = lttcomm_accept_unix_sock(client_sock); |
4537 | if (sock < 0) { | |
273ea72c | 4538 | goto error; |
273ea72c DG |
4539 | } |
4540 | ||
b662582b DG |
4541 | /* |
4542 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4543 | * show must go on. | |
4544 | */ | |
4545 | (void) utils_set_fd_cloexec(sock); | |
4546 | ||
be040666 DG |
4547 | /* Set socket option for credentials retrieval */ |
4548 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4549 | if (ret < 0) { | |
4550 | goto error; | |
4551 | } | |
4552 | ||
5eb91c98 | 4553 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4554 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4555 | if (cmd_ctx == NULL) { |
76d7553f | 4556 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4557 | goto error; |
5eb91c98 | 4558 | } |
1d4b027a | 4559 | |
5eb91c98 | 4560 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4561 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4562 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4563 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4564 | goto error; |
4565 | } | |
1d4b027a | 4566 | |
5eb91c98 DG |
4567 | cmd_ctx->llm = NULL; |
4568 | cmd_ctx->session = NULL; | |
1d4b027a | 4569 | |
840cb59c | 4570 | health_code_update(); |
44a5e5eb | 4571 | |
5eb91c98 DG |
4572 | /* |
4573 | * Data is received from the lttng client. The struct | |
4574 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4575 | * the client. | |
4576 | */ | |
4577 | DBG("Receiving data from client ..."); | |
be040666 DG |
4578 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4579 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4580 | if (ret <= 0) { |
4581 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4582 | ret = close(sock); |
4583 | if (ret) { | |
4584 | PERROR("close"); | |
4585 | } | |
4586 | sock = -1; | |
a2c0da86 | 4587 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4588 | continue; |
4589 | } | |
1d4b027a | 4590 | |
840cb59c | 4591 | health_code_update(); |
44a5e5eb | 4592 | |
5eb91c98 DG |
4593 | // TODO: Validate cmd_ctx including sanity check for |
4594 | // security purpose. | |
f7776ea7 | 4595 | |
f6a9efaa | 4596 | rcu_thread_online(); |
5eb91c98 DG |
4597 | /* |
4598 | * This function dispatch the work to the kernel or userspace tracer | |
4599 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4600 | * informations for the client. The command context struct contains | |
4601 | * everything this function may needs. | |
4602 | */ | |
53a80697 | 4603 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4604 | rcu_thread_offline(); |
5eb91c98 | 4605 | if (ret < 0) { |
36134aa1 DG |
4606 | ret = close(sock); |
4607 | if (ret) { | |
4608 | PERROR("close"); | |
53a80697 | 4609 | } |
36134aa1 | 4610 | sock = -1; |
bbd973c2 | 4611 | /* |
5eb91c98 | 4612 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4613 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4614 | * (ENOMEM). Error detected but still accept |
4615 | * command, unless a socket error has been | |
4616 | * detected. | |
bbd973c2 | 4617 | */ |
bbd973c2 | 4618 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4619 | continue; |
4620 | } | |
d6e4fca4 | 4621 | |
a503e1ef JG |
4622 | cmd_completion_handler = cmd_pop_completion_handler(); |
4623 | if (cmd_completion_handler) { | |
4624 | enum lttng_error_code completion_code; | |
4625 | ||
4626 | completion_code = cmd_completion_handler->run( | |
4627 | cmd_completion_handler->data); | |
4628 | if (completion_code != LTTNG_OK) { | |
4629 | clean_command_ctx(&cmd_ctx); | |
4630 | continue; | |
4631 | } | |
4632 | } | |
4633 | ||
840cb59c | 4634 | health_code_update(); |
44a5e5eb | 4635 | |
a1ac8b97 | 4636 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4637 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4638 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4639 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4640 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4641 | if (ret < 0) { |
4642 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4643 | } |
1d4b027a | 4644 | |
5eb91c98 | 4645 | /* End of transmission */ |
76d7553f MD |
4646 | ret = close(sock); |
4647 | if (ret) { | |
4648 | PERROR("close"); | |
4649 | } | |
4650 | sock = -1; | |
be040666 DG |
4651 | |
4652 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4653 | |
840cb59c | 4654 | health_code_update(); |
273ea72c DG |
4655 | } |
4656 | ||
139ac872 | 4657 | exit: |
5eb91c98 | 4658 | error: |
35df2755 CB |
4659 | if (sock >= 0) { |
4660 | ret = close(sock); | |
4661 | if (ret) { | |
4662 | PERROR("close"); | |
4663 | } | |
139ac872 | 4664 | } |
44a5e5eb | 4665 | |
35df2755 CB |
4666 | lttng_poll_clean(&events); |
4667 | clean_command_ctx(&cmd_ctx); | |
4668 | ||
4669 | error_listen: | |
4670 | error_create_poll: | |
e6142f2e | 4671 | unlink(config.client_unix_sock_path.value); |
76d7553f MD |
4672 | if (client_sock >= 0) { |
4673 | ret = close(client_sock); | |
4674 | if (ret) { | |
4675 | PERROR("close"); | |
4676 | } | |
a4b35e07 | 4677 | } |
35df2755 CB |
4678 | |
4679 | if (err) { | |
840cb59c | 4680 | health_error(); |
35df2755 | 4681 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4682 | } |
273ea72c | 4683 | |
8782cc74 | 4684 | health_unregister(health_sessiond); |
35df2755 CB |
4685 | |
4686 | DBG("Client thread dying"); | |
f6a9efaa DG |
4687 | |
4688 | rcu_unregister_thread(); | |
4a15001e MD |
4689 | |
4690 | /* | |
4691 | * Since we are creating the consumer threads, we own them, so we need | |
4692 | * to join them before our thread exits. | |
4693 | */ | |
4694 | ret = join_consumer_thread(&kconsumer_data); | |
4695 | if (ret) { | |
4696 | errno = ret; | |
4697 | PERROR("join_consumer"); | |
4698 | } | |
4699 | ||
4700 | ret = join_consumer_thread(&ustconsumer32_data); | |
4701 | if (ret) { | |
4702 | errno = ret; | |
4703 | PERROR("join_consumer ust32"); | |
4704 | } | |
4705 | ||
4706 | ret = join_consumer_thread(&ustconsumer64_data); | |
4707 | if (ret) { | |
4708 | errno = ret; | |
4709 | PERROR("join_consumer ust64"); | |
4710 | } | |
1d4b027a DG |
4711 | return NULL; |
4712 | } | |
4713 | ||
c0232ea5 JG |
4714 | static int string_match(const char *str1, const char *str2) |
4715 | { | |
4716 | return (str1 && str2) && !strcmp(str1, str2); | |
4717 | } | |
4718 | ||
fac6795d | 4719 | /* |
26296c48 JG |
4720 | * Take an option from the getopt output and set it in the right variable to be |
4721 | * used later. | |
4722 | * | |
4723 | * Return 0 on success else a negative value. | |
fac6795d | 4724 | */ |
26296c48 | 4725 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4726 | { |
26296c48 | 4727 | int ret = 0; |
fac6795d | 4728 | |
c0232ea5 | 4729 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4730 | if (!arg || *arg == '\0') { |
4731 | ret = -EINVAL; | |
4732 | goto end; | |
4733 | } | |
e8fa9fb0 MD |
4734 | if (lttng_is_setuid_setgid()) { |
4735 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4736 | "-c, --client-sock"); | |
4737 | } else { | |
e6142f2e JG |
4738 | config_string_set(&config.client_unix_sock_path, |
4739 | strdup(arg)); | |
4740 | if (!config.client_unix_sock_path.value) { | |
4741 | ret = -ENOMEM; | |
4742 | PERROR("strdup"); | |
4743 | } | |
e8fa9fb0 | 4744 | } |
c0232ea5 | 4745 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4746 | if (!arg || *arg == '\0') { |
4747 | ret = -EINVAL; | |
4748 | goto end; | |
4749 | } | |
e8fa9fb0 MD |
4750 | if (lttng_is_setuid_setgid()) { |
4751 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4752 | "-a, --apps-sock"); | |
4753 | } else { | |
e6142f2e JG |
4754 | config_string_set(&config.apps_unix_sock_path, |
4755 | strdup(arg)); | |
4756 | if (!config.apps_unix_sock_path.value) { | |
4757 | ret = -ENOMEM; | |
4758 | PERROR("strdup"); | |
4759 | } | |
e8fa9fb0 | 4760 | } |
c0232ea5 | 4761 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
e6142f2e | 4762 | config.daemonize = true; |
c0232ea5 | 4763 | } else if (string_match(optname, "background") || opt == 'b') { |
e6142f2e | 4764 | config.background = true; |
c0232ea5 | 4765 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4766 | if (!arg || *arg == '\0') { |
4767 | ret = -EINVAL; | |
4768 | goto end; | |
4769 | } | |
e8fa9fb0 MD |
4770 | if (lttng_is_setuid_setgid()) { |
4771 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4772 | "-g, --group"); | |
4773 | } else { | |
e6142f2e JG |
4774 | config_string_set(&config.tracing_group_name, |
4775 | strdup(arg)); | |
4776 | if (!config.tracing_group_name.value) { | |
e8fa9fb0 | 4777 | ret = -ENOMEM; |
e6142f2e | 4778 | PERROR("strdup"); |
e8fa9fb0 | 4779 | } |
db322c4d | 4780 | } |
c0232ea5 | 4781 | } else if (string_match(optname, "help") || opt == 'h') { |
4fc83d94 | 4782 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
8190767e | 4783 | if (ret) { |
4fc83d94 | 4784 | ERR("Cannot show --help for `lttng-sessiond`"); |
8190767e PP |
4785 | perror("exec"); |
4786 | } | |
4787 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4788 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4789 | fprintf(stdout, "%s\n", VERSION); |
4790 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4791 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
e6142f2e | 4792 | config.sig_parent = true; |
c0232ea5 | 4793 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4794 | if (!arg || *arg == '\0') { |
4795 | ret = -EINVAL; | |
4796 | goto end; | |
4797 | } | |
e8fa9fb0 MD |
4798 | if (lttng_is_setuid_setgid()) { |
4799 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4800 | "--kconsumerd-err-sock"); | |
4801 | } else { | |
e6142f2e JG |
4802 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
4803 | strdup(arg)); | |
4804 | if (!config.kconsumerd_err_unix_sock_path.value) { | |
4805 | ret = -ENOMEM; | |
4806 | PERROR("strdup"); | |
4807 | } | |
e8fa9fb0 | 4808 | } |
c0232ea5 | 4809 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4810 | if (!arg || *arg == '\0') { |
4811 | ret = -EINVAL; | |
4812 | goto end; | |
4813 | } | |
e8fa9fb0 MD |
4814 | if (lttng_is_setuid_setgid()) { |
4815 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4816 | "--kconsumerd-cmd-sock"); | |
4817 | } else { | |
e6142f2e JG |
4818 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
4819 | strdup(arg)); | |
4820 | if (!config.kconsumerd_cmd_unix_sock_path.value) { | |
4821 | ret = -ENOMEM; | |
4822 | PERROR("strdup"); | |
4823 | } | |
e8fa9fb0 | 4824 | } |
c0232ea5 | 4825 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4826 | if (!arg || *arg == '\0') { |
4827 | ret = -EINVAL; | |
4828 | goto end; | |
4829 | } | |
e8fa9fb0 MD |
4830 | if (lttng_is_setuid_setgid()) { |
4831 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4832 | "--ustconsumerd64-err-sock"); | |
4833 | } else { | |
e6142f2e JG |
4834 | config_string_set(&config.consumerd64_err_unix_sock_path, |
4835 | strdup(arg)); | |
4836 | if (!config.consumerd64_err_unix_sock_path.value) { | |
4837 | ret = -ENOMEM; | |
4838 | PERROR("strdup"); | |
4839 | } | |
e8fa9fb0 | 4840 | } |
c0232ea5 | 4841 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4842 | if (!arg || *arg == '\0') { |
4843 | ret = -EINVAL; | |
4844 | goto end; | |
4845 | } | |
e8fa9fb0 MD |
4846 | if (lttng_is_setuid_setgid()) { |
4847 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4848 | "--ustconsumerd64-cmd-sock"); | |
4849 | } else { | |
e6142f2e JG |
4850 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
4851 | strdup(arg)); | |
4852 | if (!config.consumerd64_cmd_unix_sock_path.value) { | |
4853 | ret = -ENOMEM; | |
4854 | PERROR("strdup"); | |
4855 | } | |
e8fa9fb0 | 4856 | } |
c0232ea5 | 4857 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4858 | if (!arg || *arg == '\0') { |
4859 | ret = -EINVAL; | |
4860 | goto end; | |
4861 | } | |
e8fa9fb0 MD |
4862 | if (lttng_is_setuid_setgid()) { |
4863 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4864 | "--ustconsumerd32-err-sock"); | |
4865 | } else { | |
e6142f2e JG |
4866 | config_string_set(&config.consumerd32_err_unix_sock_path, |
4867 | strdup(arg)); | |
4868 | if (!config.consumerd32_err_unix_sock_path.value) { | |
4869 | ret = -ENOMEM; | |
4870 | PERROR("strdup"); | |
4871 | } | |
e8fa9fb0 | 4872 | } |
c0232ea5 | 4873 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4874 | if (!arg || *arg == '\0') { |
4875 | ret = -EINVAL; | |
4876 | goto end; | |
4877 | } | |
e8fa9fb0 MD |
4878 | if (lttng_is_setuid_setgid()) { |
4879 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4880 | "--ustconsumerd32-cmd-sock"); | |
4881 | } else { | |
e6142f2e JG |
4882 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
4883 | strdup(arg)); | |
4884 | if (!config.consumerd32_cmd_unix_sock_path.value) { | |
4885 | ret = -ENOMEM; | |
4886 | PERROR("strdup"); | |
4887 | } | |
e8fa9fb0 | 4888 | } |
c0232ea5 | 4889 | } else if (string_match(optname, "no-kernel")) { |
e6142f2e | 4890 | config.no_kernel = true; |
c0232ea5 | 4891 | } else if (string_match(optname, "quiet") || opt == 'q') { |
6d9a9c65 | 4892 | config.quiet = true; |
c0232ea5 | 4893 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4894 | /* Verbose level can increase using multiple -v */ |
4895 | if (arg) { | |
13755a18 | 4896 | /* Value obtained from config file */ |
e6142f2e | 4897 | config.verbose = config_parse_value(arg); |
26296c48 | 4898 | } else { |
13755a18 | 4899 | /* -v used on command line */ |
e6142f2e | 4900 | config.verbose++; |
26296c48 | 4901 | } |
13755a18 | 4902 | /* Clamp value to [0, 3] */ |
e6142f2e JG |
4903 | config.verbose = config.verbose < 0 ? 0 : |
4904 | (config.verbose <= 3 ? config.verbose : 3); | |
c0232ea5 | 4905 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 | 4906 | if (arg) { |
e6142f2e | 4907 | config.verbose_consumer = config_parse_value(arg); |
26296c48 | 4908 | } else { |
e6142f2e | 4909 | config.verbose_consumer++; |
26296c48 | 4910 | } |
c0232ea5 | 4911 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4912 | if (!arg || *arg == '\0') { |
4913 | ret = -EINVAL; | |
4914 | goto end; | |
4915 | } | |
e8fa9fb0 MD |
4916 | if (lttng_is_setuid_setgid()) { |
4917 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4918 | "--consumerd32-path"); | |
4919 | } else { | |
e6142f2e JG |
4920 | config_string_set(&config.consumerd32_bin_path, |
4921 | strdup(arg)); | |
4922 | if (!config.consumerd32_bin_path.value) { | |
e8fa9fb0 MD |
4923 | PERROR("strdup"); |
4924 | ret = -ENOMEM; | |
4925 | } | |
db322c4d | 4926 | } |
c0232ea5 | 4927 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4928 | if (!arg || *arg == '\0') { |
4929 | ret = -EINVAL; | |
4930 | goto end; | |
4931 | } | |
e8fa9fb0 MD |
4932 | if (lttng_is_setuid_setgid()) { |
4933 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4934 | "--consumerd32-libdir"); | |
4935 | } else { | |
e6142f2e JG |
4936 | config_string_set(&config.consumerd32_lib_dir, |
4937 | strdup(arg)); | |
4938 | if (!config.consumerd32_lib_dir.value) { | |
e8fa9fb0 MD |
4939 | PERROR("strdup"); |
4940 | ret = -ENOMEM; | |
4941 | } | |
db322c4d | 4942 | } |
c0232ea5 | 4943 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
4944 | if (!arg || *arg == '\0') { |
4945 | ret = -EINVAL; | |
4946 | goto end; | |
4947 | } | |
e8fa9fb0 MD |
4948 | if (lttng_is_setuid_setgid()) { |
4949 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4950 | "--consumerd64-path"); | |
4951 | } else { | |
e6142f2e JG |
4952 | config_string_set(&config.consumerd64_bin_path, |
4953 | strdup(arg)); | |
4954 | if (!config.consumerd64_bin_path.value) { | |
e8fa9fb0 MD |
4955 | PERROR("strdup"); |
4956 | ret = -ENOMEM; | |
4957 | } | |
db322c4d | 4958 | } |
c0232ea5 | 4959 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
4960 | if (!arg || *arg == '\0') { |
4961 | ret = -EINVAL; | |
4962 | goto end; | |
4963 | } | |
e8fa9fb0 MD |
4964 | if (lttng_is_setuid_setgid()) { |
4965 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4966 | "--consumerd64-libdir"); | |
4967 | } else { | |
e6142f2e JG |
4968 | config_string_set(&config.consumerd64_lib_dir, |
4969 | strdup(arg)); | |
4970 | if (!config.consumerd64_lib_dir.value) { | |
e8fa9fb0 MD |
4971 | PERROR("strdup"); |
4972 | ret = -ENOMEM; | |
4973 | } | |
db322c4d | 4974 | } |
c0232ea5 | 4975 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
4976 | if (!arg || *arg == '\0') { |
4977 | ret = -EINVAL; | |
4978 | goto end; | |
4979 | } | |
e8fa9fb0 MD |
4980 | if (lttng_is_setuid_setgid()) { |
4981 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4982 | "-p, --pidfile"); | |
4983 | } else { | |
e6142f2e JG |
4984 | config_string_set(&config.pid_file_path, strdup(arg)); |
4985 | if (!config.pid_file_path.value) { | |
e8fa9fb0 MD |
4986 | PERROR("strdup"); |
4987 | ret = -ENOMEM; | |
4988 | } | |
db322c4d | 4989 | } |
c0232ea5 | 4990 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
4991 | if (!arg || *arg == '\0') { |
4992 | ret = -EINVAL; | |
4993 | goto end; | |
4994 | } | |
e8fa9fb0 MD |
4995 | if (lttng_is_setuid_setgid()) { |
4996 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4997 | "--agent-tcp-port"); | |
4998 | } else { | |
4999 | unsigned long v; | |
4d076222 | 5000 | |
e8fa9fb0 MD |
5001 | errno = 0; |
5002 | v = strtoul(arg, NULL, 0); | |
5003 | if (errno != 0 || !isdigit(arg[0])) { | |
5004 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
5005 | return -1; | |
5006 | } | |
5007 | if (v == 0 || v >= 65535) { | |
5008 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
5009 | return -1; | |
5010 | } | |
2288467f JG |
5011 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
5012 | DBG3("Agent TCP port set to non default: %i", (int) v); | |
26296c48 | 5013 | } |
c0232ea5 | 5014 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
5015 | if (!arg || *arg == '\0') { |
5016 | ret = -EINVAL; | |
5017 | goto end; | |
5018 | } | |
e8fa9fb0 MD |
5019 | if (lttng_is_setuid_setgid()) { |
5020 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5021 | "-l, --load"); | |
5022 | } else { | |
e6142f2e JG |
5023 | config_string_set(&config.load_session_path, strdup(arg)); |
5024 | if (!config.load_session_path.value) { | |
e8fa9fb0 MD |
5025 | PERROR("strdup"); |
5026 | ret = -ENOMEM; | |
5027 | } | |
ef367a93 | 5028 | } |
c0232ea5 | 5029 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
5030 | if (!arg || *arg == '\0') { |
5031 | ret = -EINVAL; | |
5032 | goto end; | |
5033 | } | |
e8fa9fb0 MD |
5034 | if (lttng_is_setuid_setgid()) { |
5035 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5036 | "--kmod-probes"); | |
5037 | } else { | |
e6142f2e JG |
5038 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
5039 | if (!config.kmod_probes_list.value) { | |
e8fa9fb0 MD |
5040 | PERROR("strdup"); |
5041 | ret = -ENOMEM; | |
5042 | } | |
c9d42407 | 5043 | } |
c0232ea5 | 5044 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
5045 | if (!arg || *arg == '\0') { |
5046 | ret = -EINVAL; | |
5047 | goto end; | |
5048 | } | |
e8fa9fb0 MD |
5049 | if (lttng_is_setuid_setgid()) { |
5050 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5051 | "--extra-kmod-probes"); | |
5052 | } else { | |
e6142f2e JG |
5053 | config_string_set(&config.kmod_extra_probes_list, |
5054 | strdup(arg)); | |
5055 | if (!config.kmod_extra_probes_list.value) { | |
e8fa9fb0 MD |
5056 | PERROR("strdup"); |
5057 | ret = -ENOMEM; | |
5058 | } | |
db322c4d | 5059 | } |
c0232ea5 JG |
5060 | } else if (string_match(optname, "config") || opt == 'f') { |
5061 | /* This is handled in set_options() thus silent skip. */ | |
5062 | goto end; | |
5063 | } else { | |
26296c48 JG |
5064 | /* Unknown option or other error. |
5065 | * Error is printed by getopt, just return */ | |
5066 | ret = -1; | |
5067 | } | |
5068 | ||
f3dd7ce7 | 5069 | end: |
c5d350b2 JG |
5070 | if (ret == -EINVAL) { |
5071 | const char *opt_name = "unknown"; | |
5072 | int i; | |
5073 | ||
5074 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
5075 | i++) { | |
5076 | if (opt == long_options[i].val) { | |
5077 | opt_name = long_options[i].name; | |
5078 | break; | |
5079 | } | |
5080 | } | |
5081 | ||
5082 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
5083 | opt_name); | |
5084 | } | |
f3dd7ce7 | 5085 | |
26296c48 JG |
5086 | return ret; |
5087 | } | |
5088 | ||
5089 | /* | |
5090 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 5091 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
5092 | * return value conventions. |
5093 | */ | |
5094 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
5095 | { | |
5096 | int ret = 0, i; | |
5097 | ||
5098 | if (!entry || !entry->name || !entry->value) { | |
5099 | ret = -EINVAL; | |
5100 | goto end; | |
5101 | } | |
5102 | ||
5103 | /* Check if the option is to be ignored */ | |
5104 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
5105 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
5106 | goto end; | |
5107 | } | |
5108 | } | |
5109 | ||
5110 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5111 | i++) { | |
5112 | ||
5113 | /* Ignore if not fully matched. */ | |
5114 | if (strcmp(entry->name, long_options[i].name)) { | |
5115 | continue; | |
5116 | } | |
5117 | ||
5118 | /* | |
5119 | * If the option takes no argument on the command line, we have to | |
5120 | * check if the value is "true". We support non-zero numeric values, | |
5121 | * true, on and yes. | |
5122 | */ | |
5123 | if (!long_options[i].has_arg) { | |
5124 | ret = config_parse_value(entry->value); | |
5125 | if (ret <= 0) { | |
5126 | if (ret) { | |
5127 | WARN("Invalid configuration value \"%s\" for option %s", | |
5128 | entry->value, entry->name); | |
5129 | } | |
5130 | /* False, skip boolean config option. */ | |
5131 | goto end; | |
4d076222 | 5132 | } |
26296c48 JG |
5133 | } |
5134 | ||
5135 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5136 | goto end; | |
5137 | } | |
5138 | ||
5139 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5140 | ||
5141 | end: | |
5142 | return ret; | |
5143 | } | |
5144 | ||
5145 | /* | |
5146 | * daemon configuration loading and argument parsing | |
5147 | */ | |
5148 | static int set_options(int argc, char **argv) | |
5149 | { | |
5150 | int ret = 0, c = 0, option_index = 0; | |
5151 | int orig_optopt = optopt, orig_optind = optind; | |
5152 | char *optstring; | |
5153 | const char *config_path = NULL; | |
5154 | ||
5155 | optstring = utils_generate_optstring(long_options, | |
5156 | sizeof(long_options) / sizeof(struct option)); | |
5157 | if (!optstring) { | |
5158 | ret = -ENOMEM; | |
5159 | goto end; | |
5160 | } | |
5161 | ||
5162 | /* Check for the --config option */ | |
5163 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5164 | &option_index)) != -1) { | |
5165 | if (c == '?') { | |
5166 | ret = -EINVAL; | |
5167 | goto end; | |
5168 | } else if (c != 'f') { | |
5169 | /* if not equal to --config option. */ | |
5170 | continue; | |
5171 | } | |
5172 | ||
e8fa9fb0 MD |
5173 | if (lttng_is_setuid_setgid()) { |
5174 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5175 | "-f, --config"); | |
5176 | } else { | |
5177 | config_path = utils_expand_path(optarg); | |
5178 | if (!config_path) { | |
5179 | ERR("Failed to resolve path: %s", optarg); | |
5180 | } | |
26296c48 JG |
5181 | } |
5182 | } | |
5183 | ||
5184 | ret = config_get_section_entries(config_path, config_section_name, | |
5185 | config_entry_handler, NULL); | |
5186 | if (ret) { | |
5187 | if (ret > 0) { | |
5188 | ERR("Invalid configuration option at line %i", ret); | |
5189 | ret = -1; | |
5190 | } | |
5191 | goto end; | |
5192 | } | |
5193 | ||
5194 | /* Reset getopt's global state */ | |
5195 | optopt = orig_optopt; | |
5196 | optind = orig_optind; | |
5197 | while (1) { | |
c0232ea5 JG |
5198 | option_index = -1; |
5199 | /* | |
5200 | * getopt_long() will not set option_index if it encounters a | |
5201 | * short option. | |
5202 | */ | |
5203 | c = getopt_long(argc, argv, optstring, long_options, | |
5204 | &option_index); | |
26296c48 | 5205 | if (c == -1) { |
4d076222 DG |
5206 | break; |
5207 | } | |
26296c48 | 5208 | |
c0232ea5 JG |
5209 | /* |
5210 | * Pass NULL as the long option name if popt left the index | |
5211 | * unset. | |
5212 | */ | |
5213 | ret = set_option(c, optarg, | |
5214 | option_index < 0 ? NULL : | |
5215 | long_options[option_index].name); | |
26296c48 JG |
5216 | if (ret < 0) { |
5217 | break; | |
fac6795d DG |
5218 | } |
5219 | } | |
5220 | ||
26296c48 JG |
5221 | end: |
5222 | free(optstring); | |
5223 | return ret; | |
fac6795d DG |
5224 | } |
5225 | ||
5226 | /* | |
d063d709 | 5227 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5228 | * apps_sock - The communication socket for all UST apps. |
5229 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5230 | */ |
cf3af59e | 5231 | static int init_daemon_socket(void) |
fac6795d DG |
5232 | { |
5233 | int ret = 0; | |
5234 | mode_t old_umask; | |
5235 | ||
5236 | old_umask = umask(0); | |
5237 | ||
5238 | /* Create client tool unix socket */ | |
e6142f2e | 5239 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
d6f42150 | 5240 | if (client_sock < 0) { |
e6142f2e | 5241 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
fac6795d DG |
5242 | ret = -1; |
5243 | goto end; | |
5244 | } | |
5245 | ||
b662582b DG |
5246 | /* Set the cloexec flag */ |
5247 | ret = utils_set_fd_cloexec(client_sock); | |
5248 | if (ret < 0) { | |
5249 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5250 | "Continuing but note that the consumer daemon will have a " | |
5251 | "reference to this socket on exec()", client_sock); | |
5252 | } | |
5253 | ||
fac6795d | 5254 | /* File permission MUST be 660 */ |
e6142f2e | 5255 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
fac6795d | 5256 | if (ret < 0) { |
e6142f2e | 5257 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
76d7553f | 5258 | PERROR("chmod"); |
fac6795d DG |
5259 | goto end; |
5260 | } | |
5261 | ||
5262 | /* Create the application unix socket */ | |
e6142f2e | 5263 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
d6f42150 | 5264 | if (apps_sock < 0) { |
e6142f2e | 5265 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
fac6795d DG |
5266 | ret = -1; |
5267 | goto end; | |
5268 | } | |
5269 | ||
b662582b DG |
5270 | /* Set the cloexec flag */ |
5271 | ret = utils_set_fd_cloexec(apps_sock); | |
5272 | if (ret < 0) { | |
5273 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5274 | "Continuing but note that the consumer daemon will have a " | |
5275 | "reference to this socket on exec()", apps_sock); | |
5276 | } | |
5277 | ||
d6f42150 | 5278 | /* File permission MUST be 666 */ |
e6142f2e | 5279 | ret = chmod(config.apps_unix_sock_path.value, |
54d01ffb | 5280 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
fac6795d | 5281 | if (ret < 0) { |
e6142f2e | 5282 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
76d7553f | 5283 | PERROR("chmod"); |
fac6795d DG |
5284 | goto end; |
5285 | } | |
5286 | ||
b662582b DG |
5287 | DBG3("Session daemon client socket %d and application socket %d created", |
5288 | client_sock, apps_sock); | |
5289 | ||
fac6795d DG |
5290 | end: |
5291 | umask(old_umask); | |
5292 | return ret; | |
5293 | } | |
5294 | ||
f472090a JG |
5295 | /* |
5296 | * Create lockfile using the rundir and return its fd. | |
5297 | */ | |
5298 | static int create_lockfile(void) | |
5299 | { | |
5300 | return utils_create_lock_file(config.lock_file_path.value); | |
5301 | } | |
5302 | ||
fac6795d | 5303 | /* |
54d01ffb DG |
5304 | * Check if the global socket is available, and if a daemon is answering at the |
5305 | * other side. If yes, error is returned. | |
f472090a JG |
5306 | * |
5307 | * Also attempts to create and hold the lock file. | |
fac6795d | 5308 | */ |
cf3af59e | 5309 | static int check_existing_daemon(void) |
fac6795d | 5310 | { |
f472090a JG |
5311 | int ret = 0; |
5312 | ||
7d8234d9 | 5313 | /* Is there anybody out there ? */ |
099e26bd | 5314 | if (lttng_session_daemon_alive()) { |
f472090a JG |
5315 | ret = -EEXIST; |
5316 | goto end; | |
099e26bd | 5317 | } |
b09c7c76 | 5318 | |
f472090a JG |
5319 | lockfile_fd = create_lockfile(); |
5320 | if (lockfile_fd < 0) { | |
5321 | ret = -EEXIST; | |
5322 | goto end; | |
5323 | } | |
5324 | end: | |
5325 | return ret; | |
5326 | } | |
5327 | ||
5328 | static void sessiond_cleanup_lock_file(void) | |
5329 | { | |
5330 | int ret; | |
5331 | ||
5332 | /* | |
5333 | * Cleanup lock file by deleting it and finaly closing it which will | |
5334 | * release the file system lock. | |
5335 | */ | |
5336 | if (lockfile_fd >= 0) { | |
5337 | ret = remove(config.lock_file_path.value); | |
5338 | if (ret < 0) { | |
5339 | PERROR("remove lock file"); | |
5340 | } | |
5341 | ret = close(lockfile_fd); | |
5342 | if (ret < 0) { | |
5343 | PERROR("close lock file"); | |
5344 | } | |
5345 | } | |
fac6795d DG |
5346 | } |
5347 | ||
fac6795d | 5348 | /* |
d063d709 | 5349 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5350 | * |
d063d709 | 5351 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5352 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5353 | */ |
be040666 | 5354 | static int set_permissions(char *rundir) |
fac6795d DG |
5355 | { |
5356 | int ret; | |
996b65c8 | 5357 | gid_t gid; |
fac6795d | 5358 | |
e6142f2e | 5359 | gid = utils_get_group_id(config.tracing_group_name.value); |
fac6795d | 5360 | |
d6f42150 | 5361 | /* Set lttng run dir */ |
be040666 | 5362 | ret = chown(rundir, 0, gid); |
d6f42150 | 5363 | if (ret < 0) { |
be040666 | 5364 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5365 | PERROR("chown"); |
d6f42150 DG |
5366 | } |
5367 | ||
6c71277b MD |
5368 | /* |
5369 | * Ensure all applications and tracing group can search the run | |
5370 | * dir. Allow everyone to read the directory, since it does not | |
5371 | * buy us anything to hide its content. | |
5372 | */ | |
5373 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5374 | if (ret < 0) { |
5375 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5376 | PERROR("chmod"); |
d1613cf5 JN |
5377 | } |
5378 | ||
d6f42150 | 5379 | /* lttng client socket path */ |
e6142f2e | 5380 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
fac6795d | 5381 | if (ret < 0) { |
e6142f2e | 5382 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
76d7553f | 5383 | PERROR("chown"); |
d6f42150 DG |
5384 | } |
5385 | ||
3bd1e081 | 5386 | /* kconsumer error socket path */ |
6c71277b | 5387 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5388 | if (ret < 0) { |
3bd1e081 | 5389 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5390 | PERROR("chown"); |
3bd1e081 MD |
5391 | } |
5392 | ||
7753dea8 | 5393 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5394 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5395 | if (ret < 0) { |
5396 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5397 | PERROR("chown"); |
7753dea8 MD |
5398 | } |
5399 | ||
5400 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5401 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5402 | if (ret < 0) { |
7753dea8 | 5403 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5404 | PERROR("chown"); |
fac6795d DG |
5405 | } |
5406 | ||
d6f42150 | 5407 | DBG("All permissions are set"); |
e07ae692 | 5408 | |
fac6795d DG |
5409 | return ret; |
5410 | } | |
5411 | ||
d6f42150 | 5412 | /* |
d063d709 | 5413 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5414 | */ |
e6142f2e | 5415 | static int create_lttng_rundir(void) |
d6f42150 DG |
5416 | { |
5417 | int ret; | |
5418 | ||
e6142f2e | 5419 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
67e40797 | 5420 | |
e6142f2e | 5421 | ret = mkdir(config.rundir.value, S_IRWXU); |
d6f42150 | 5422 | if (ret < 0) { |
b1f11e69 | 5423 | if (errno != EEXIST) { |
e6142f2e | 5424 | ERR("Unable to create %s", config.rundir.value); |
b1f11e69 DG |
5425 | goto error; |
5426 | } else { | |
5427 | ret = 0; | |
5428 | } | |
d6f42150 DG |
5429 | } |
5430 | ||
5431 | error: | |
5432 | return ret; | |
5433 | } | |
5434 | ||
5435 | /* | |
e6142f2e | 5436 | * Setup sockets and directory needed by the consumerds' communication with the |
d063d709 | 5437 | * session daemon. |
d6f42150 | 5438 | */ |
e6142f2e | 5439 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
5440 | { |
5441 | int ret; | |
e6142f2e | 5442 | char *path = NULL; |
d6f42150 | 5443 | |
6c71277b | 5444 | switch (consumer_data->type) { |
7753dea8 | 5445 | case LTTNG_CONSUMER_KERNEL: |
e6142f2e | 5446 | path = config.kconsumerd_path.value; |
7753dea8 MD |
5447 | break; |
5448 | case LTTNG_CONSUMER64_UST: | |
e6142f2e | 5449 | path = config.consumerd64_path.value; |
7753dea8 MD |
5450 | break; |
5451 | case LTTNG_CONSUMER32_UST: | |
e6142f2e | 5452 | path = config.consumerd32_path.value; |
7753dea8 MD |
5453 | break; |
5454 | default: | |
5455 | ERR("Consumer type unknown"); | |
5456 | ret = -EINVAL; | |
5457 | goto error; | |
d6f42150 | 5458 | } |
e6142f2e | 5459 | assert(path); |
d6f42150 | 5460 | |
67e40797 DG |
5461 | DBG2("Creating consumer directory: %s", path); |
5462 | ||
6c71277b | 5463 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
e7e1ef17 JR |
5464 | if (ret < 0 && errno != EEXIST) { |
5465 | PERROR("mkdir"); | |
5466 | ERR("Failed to create %s", path); | |
5467 | goto error; | |
d6f42150 | 5468 | } |
6c71277b | 5469 | if (is_root) { |
e6142f2e | 5470 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
6c71277b MD |
5471 | if (ret < 0) { |
5472 | ERR("Unable to set group on %s", path); | |
5473 | PERROR("chown"); | |
5474 | goto error; | |
5475 | } | |
5476 | } | |
d6f42150 | 5477 | |
e6142f2e | 5478 | /* Create the consumerd error unix socket */ |
3bd1e081 MD |
5479 | consumer_data->err_sock = |
5480 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5481 | if (consumer_data->err_sock < 0) { | |
5482 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5483 | ret = -1; |
5484 | goto error; | |
5485 | } | |
5486 | ||
a24f05ab MD |
5487 | /* |
5488 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5489 | * show must go on. | |
5490 | */ | |
5491 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5492 | if (ret < 0) { | |
5493 | PERROR("utils_set_fd_cloexec"); | |
5494 | /* continue anyway */ | |
5495 | } | |
5496 | ||
d6f42150 | 5497 | /* File permission MUST be 660 */ |
3bd1e081 | 5498 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5499 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5500 | if (ret < 0) { |
3bd1e081 | 5501 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5502 | PERROR("chmod"); |
d6f42150 DG |
5503 | goto error; |
5504 | } | |
5505 | ||
5506 | error: | |
5507 | return ret; | |
5508 | } | |
5509 | ||
fac6795d | 5510 | /* |
d063d709 | 5511 | * Signal handler for the daemon |
cf3af59e | 5512 | * |
54d01ffb DG |
5513 | * Simply stop all worker threads, leaving main() return gracefully after |
5514 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5515 | */ |
5516 | static void sighandler(int sig) | |
5517 | { | |
5518 | switch (sig) { | |
cf3af59e | 5519 | case SIGINT: |
af87c45a | 5520 | DBG("SIGINT caught"); |
cf3af59e MD |
5521 | stop_threads(); |
5522 | break; | |
5523 | case SIGTERM: | |
af87c45a | 5524 | DBG("SIGTERM caught"); |
cf3af59e MD |
5525 | stop_threads(); |
5526 | break; | |
0bb7724a DG |
5527 | case SIGUSR1: |
5528 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5529 | break; | |
cf3af59e MD |
5530 | default: |
5531 | break; | |
fac6795d | 5532 | } |
fac6795d DG |
5533 | } |
5534 | ||
5535 | /* | |
d063d709 | 5536 | * Setup signal handler for : |
1d4b027a | 5537 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5538 | */ |
1d4b027a | 5539 | static int set_signal_handler(void) |
fac6795d | 5540 | { |
1d4b027a DG |
5541 | int ret = 0; |
5542 | struct sigaction sa; | |
5543 | sigset_t sigset; | |
fac6795d | 5544 | |
1d4b027a | 5545 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5546 | PERROR("sigemptyset"); |
1d4b027a DG |
5547 | return ret; |
5548 | } | |
d6f42150 | 5549 | |
1d4b027a DG |
5550 | sa.sa_mask = sigset; |
5551 | sa.sa_flags = 0; | |
0072e5e2 MD |
5552 | |
5553 | sa.sa_handler = sighandler; | |
1d4b027a | 5554 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5555 | PERROR("sigaction"); |
1d4b027a | 5556 | return ret; |
d6f42150 DG |
5557 | } |
5558 | ||
1d4b027a | 5559 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5560 | PERROR("sigaction"); |
1d4b027a | 5561 | return ret; |
d6f42150 | 5562 | } |
aaf26714 | 5563 | |
0072e5e2 | 5564 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5565 | PERROR("sigaction"); |
1d4b027a | 5566 | return ret; |
8c0faa1d DG |
5567 | } |
5568 | ||
0072e5e2 MD |
5569 | sa.sa_handler = SIG_IGN; |
5570 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5571 | PERROR("sigaction"); |
5572 | return ret; | |
5573 | } | |
5574 | ||
5575 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5576 | |
5577 | return ret; | |
fac6795d DG |
5578 | } |
5579 | ||
f3ed775e | 5580 | /* |
d063d709 | 5581 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5582 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5583 | */ |
5584 | static void set_ulimit(void) | |
5585 | { | |
5586 | int ret; | |
5587 | struct rlimit lim; | |
5588 | ||
514bb9f0 | 5589 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5590 | lim.rlim_cur = 65535; |
5591 | lim.rlim_max = 65535; | |
5592 | ||
5593 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5594 | if (ret < 0) { | |
76d7553f | 5595 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5596 | } |
5597 | } | |
5598 | ||
4a15001e | 5599 | static int write_pidfile(void) |
35f90c40 | 5600 | { |
e6142f2e | 5601 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
35f90c40 DG |
5602 | } |
5603 | ||
e6142f2e JG |
5604 | static int set_clock_plugin_env(void) |
5605 | { | |
5606 | int ret = 0; | |
5607 | char *env_value = NULL; | |
cd9290dd | 5608 | |
e6142f2e JG |
5609 | if (!config.lttng_ust_clock_plugin.value) { |
5610 | goto end; | |
5611 | } | |
5612 | ||
5613 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5614 | config.lttng_ust_clock_plugin.value); | |
cd9290dd | 5615 | if (ret < 0) { |
e6142f2e JG |
5616 | PERROR("asprintf"); |
5617 | goto end; | |
cd9290dd DG |
5618 | } |
5619 | ||
e6142f2e JG |
5620 | ret = putenv(env_value); |
5621 | if (ret) { | |
5622 | free(env_value); | |
5623 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5624 | goto end; | |
5625 | } | |
cd9290dd | 5626 | |
e6142f2e JG |
5627 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
5628 | config.lttng_ust_clock_plugin.value); | |
5629 | end: | |
4a15001e | 5630 | return ret; |
ef367a93 JG |
5631 | } |
5632 | ||
fac6795d DG |
5633 | /* |
5634 | * main | |
5635 | */ | |
5636 | int main(int argc, char **argv) | |
5637 | { | |
4a15001e | 5638 | int ret = 0, retval = 0; |
fac6795d | 5639 | void *status; |
e6142f2e | 5640 | const char *env_app_timeout; |
b3530820 JG |
5641 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
5642 | *ust64_channel_monitor_pipe = NULL, | |
5643 | *kernel_channel_monitor_pipe = NULL; | |
99611076 JG |
5644 | bool notification_thread_launched = false; |
5645 | bool rotation_thread_launched = false; | |
5646 | bool timer_thread_launched = false; | |
d086f507 JD |
5647 | struct timer_thread_parameters timer_thread_ctx; |
5648 | /* Queue of rotation jobs populated by the sessiond-timer. */ | |
5649 | struct rotation_thread_timer_queue *rotation_timer_queue = NULL; | |
90936dcf | 5650 | sem_t notification_thread_ready; |
fac6795d | 5651 | |
335a95b7 MD |
5652 | init_kernel_workarounds(); |
5653 | ||
f6a9efaa DG |
5654 | rcu_register_thread(); |
5655 | ||
4a15001e MD |
5656 | if (set_signal_handler()) { |
5657 | retval = -1; | |
5658 | goto exit_set_signal_handler; | |
0bb7724a DG |
5659 | } |
5660 | ||
92816cc3 | 5661 | if (timer_signal_init()) { |
d086f507 JD |
5662 | retval = -1; |
5663 | goto exit_set_signal_handler; | |
5664 | } | |
5665 | ||
12744796 DG |
5666 | page_size = sysconf(_SC_PAGESIZE); |
5667 | if (page_size < 0) { | |
5668 | PERROR("sysconf _SC_PAGESIZE"); | |
5669 | page_size = LONG_MAX; | |
5670 | WARN("Fallback page size to %ld", page_size); | |
5671 | } | |
5672 | ||
e6142f2e JG |
5673 | ret = sessiond_config_init(&config); |
5674 | if (ret) { | |
5675 | retval = -1; | |
5676 | goto exit_set_signal_handler; | |
5677 | } | |
5678 | ||
2788b494 JR |
5679 | /* |
5680 | * Init config from environment variables. | |
5681 | * Command line option override env configuration per-doc. Do env first. | |
5682 | */ | |
5683 | sessiond_config_apply_env_config(&config); | |
5684 | ||
4a15001e MD |
5685 | /* |
5686 | * Parse arguments and load the daemon configuration file. | |
5687 | * | |
5688 | * We have an exit_options exit path to free memory reserved by | |
5689 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5690 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5691 | * depends on set_options. | |
5692 | */ | |
fac6795d | 5693 | progname = argv[0]; |
4a15001e MD |
5694 | if (set_options(argc, argv)) { |
5695 | retval = -1; | |
5696 | goto exit_options; | |
fac6795d DG |
5697 | } |
5698 | ||
e6142f2e JG |
5699 | /* |
5700 | * Resolve all paths received as arguments, configuration option, or | |
5701 | * through environment variable as absolute paths. This is necessary | |
5702 | * since daemonizing causes the sessiond's current working directory | |
5703 | * to '/'. | |
5704 | */ | |
5705 | ret = sessiond_config_resolve_paths(&config); | |
5706 | if (ret) { | |
5707 | goto exit_options; | |
5708 | } | |
5709 | ||
5710 | /* Apply config. */ | |
5711 | lttng_opt_verbose = config.verbose; | |
5712 | lttng_opt_quiet = config.quiet; | |
5713 | kconsumer_data.err_unix_sock_path = | |
5714 | config.kconsumerd_err_unix_sock_path.value; | |
5715 | kconsumer_data.cmd_unix_sock_path = | |
5716 | config.kconsumerd_cmd_unix_sock_path.value; | |
5717 | ustconsumer32_data.err_unix_sock_path = | |
5718 | config.consumerd32_err_unix_sock_path.value; | |
5719 | ustconsumer32_data.cmd_unix_sock_path = | |
5720 | config.consumerd32_cmd_unix_sock_path.value; | |
5721 | ustconsumer64_data.err_unix_sock_path = | |
5722 | config.consumerd64_err_unix_sock_path.value; | |
5723 | ustconsumer64_data.cmd_unix_sock_path = | |
5724 | config.consumerd64_cmd_unix_sock_path.value; | |
5725 | set_clock_plugin_env(); | |
5726 | ||
5727 | sessiond_config_log(&config); | |
5728 | ||
f472090a JG |
5729 | if (create_lttng_rundir()) { |
5730 | retval = -1; | |
5731 | goto exit_options; | |
5732 | } | |
5733 | ||
5734 | /* Abort launch if a session daemon is already running. */ | |
5735 | if (check_existing_daemon()) { | |
5736 | ERR("A session daemon is already running."); | |
5737 | retval = -1; | |
5738 | goto exit_options; | |
5739 | } | |
5740 | ||
fac6795d | 5741 | /* Daemonize */ |
e6142f2e | 5742 | if (config.daemonize || config.background) { |
ceed52b5 MD |
5743 | int i; |
5744 | ||
72dd7491 | 5745 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
e6142f2e | 5746 | !config.background); |
53094c05 | 5747 | if (ret < 0) { |
4a15001e MD |
5748 | retval = -1; |
5749 | goto exit_options; | |
53094c05 | 5750 | } |
0bb7724a | 5751 | |
ceed52b5 | 5752 | /* |
0bb7724a | 5753 | * We are in the child. Make sure all other file descriptors are |
4a15001e | 5754 | * closed, in case we are called with more opened file |
f472090a | 5755 | * descriptors than the standard ones and the lock file. |
ceed52b5 MD |
5756 | */ |
5757 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
f472090a JG |
5758 | if (i == lockfile_fd) { |
5759 | continue; | |
5760 | } | |
ceed52b5 MD |
5761 | (void) close(i); |
5762 | } | |
5763 | } | |
5764 | ||
7567352f MD |
5765 | if (run_as_create_worker(argv[0]) < 0) { |
5766 | goto exit_create_run_as_worker_cleanup; | |
5767 | } | |
5768 | ||
4a15001e MD |
5769 | /* |
5770 | * Starting from here, we can create threads. This needs to be after | |
5771 | * lttng_daemonize due to RCU. | |
5772 | */ | |
5773 | ||
5774 | /* | |
5775 | * Initialize the health check subsystem. This call should set the | |
5776 | * appropriate time values. | |
5777 | */ | |
5778 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5779 | if (!health_sessiond) { | |
5780 | PERROR("health_app_create error"); | |
5781 | retval = -1; | |
5782 | goto exit_health_sessiond_cleanup; | |
5783 | } | |
5784 | ||
4a15001e | 5785 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5786 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5787 | retval = -1; |
5788 | goto exit_ht_cleanup; | |
5789 | } | |
5790 | ||
ceed52b5 | 5791 | /* Create thread quit pipe */ |
a7333da7 | 5792 | if (sessiond_init_thread_quit_pipe()) { |
4a15001e MD |
5793 | retval = -1; |
5794 | goto exit_init_data; | |
fac6795d DG |
5795 | } |
5796 | ||
5797 | /* Check if daemon is UID = 0 */ | |
5798 | is_root = !getuid(); | |
fac6795d | 5799 | if (is_root) { |
67e40797 | 5800 | /* Create global run dir with root access */ |
67e40797 | 5801 | |
b3530820 JG |
5802 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
5803 | if (!kernel_channel_monitor_pipe) { | |
5804 | ERR("Failed to create kernel consumer channel monitor pipe"); | |
5805 | retval = -1; | |
5806 | goto exit_init_data; | |
5807 | } | |
5808 | kconsumer_data.channel_monitor_pipe = | |
5809 | lttng_pipe_release_writefd( | |
5810 | kernel_channel_monitor_pipe); | |
5811 | if (kconsumer_data.channel_monitor_pipe < 0) { | |
5812 | retval = -1; | |
5813 | goto exit_init_data; | |
5814 | } | |
fac6795d DG |
5815 | } |
5816 | ||
5c827ce0 DG |
5817 | /* Set consumer initial state */ |
5818 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5819 | ust_consumerd_state = CONSUMER_STOPPED; | |
5820 | ||
b3530820 JG |
5821 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
5822 | if (!ust32_channel_monitor_pipe) { | |
5823 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); | |
5824 | retval = -1; | |
5825 | goto exit_init_data; | |
5826 | } | |
5827 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5828 | ust32_channel_monitor_pipe); | |
5829 | if (ustconsumer32_data.channel_monitor_pipe < 0) { | |
5830 | retval = -1; | |
5831 | goto exit_init_data; | |
5832 | } | |
62c43103 | 5833 | |
d086f507 | 5834 | /* |
92816cc3 JG |
5835 | * The rotation_thread_timer_queue structure is shared between the |
5836 | * sessiond timer thread and the rotation thread. The main thread keeps | |
5837 | * its ownership and destroys it when both threads have been joined. | |
d086f507 | 5838 | */ |
92816cc3 | 5839 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
d086f507 JD |
5840 | if (!rotation_timer_queue) { |
5841 | retval = -1; | |
5842 | goto exit_init_data; | |
5843 | } | |
92816cc3 | 5844 | timer_thread_ctx.rotation_thread_job_queue = rotation_timer_queue; |
67e40797 | 5845 | |
b3530820 JG |
5846 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
5847 | if (!ust64_channel_monitor_pipe) { | |
5848 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); | |
5849 | retval = -1; | |
5850 | goto exit_init_data; | |
5851 | } | |
5852 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5853 | ust64_channel_monitor_pipe); | |
5854 | if (ustconsumer64_data.channel_monitor_pipe < 0) { | |
5855 | retval = -1; | |
5856 | goto exit_init_data; | |
5857 | } | |
847177cd | 5858 | |
1427f9b2 DG |
5859 | /* |
5860 | * Init UST app hash table. Alloc hash table before this point since | |
5861 | * cleanup() can get called after that point. | |
5862 | */ | |
4a15001e | 5863 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 5864 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
5865 | retval = -1; |
5866 | goto exit_init_data; | |
5867 | } | |
1427f9b2 | 5868 | |
6a4e4039 JG |
5869 | /* |
5870 | * Initialize agent app hash table. We allocate the hash table here | |
5871 | * since cleanup() can get called after this point. | |
5872 | */ | |
5873 | if (agent_app_ht_alloc()) { | |
5874 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
5875 | retval = -1; |
5876 | goto exit_init_data; | |
f20baf8e DG |
5877 | } |
5878 | ||
a88df331 DG |
5879 | /* |
5880 | * These actions must be executed as root. We do that *after* setting up | |
5881 | * the sockets path because we MUST make the check for another daemon using | |
5882 | * those paths *before* trying to set the kernel consumer sockets and init | |
5883 | * kernel tracer. | |
5884 | */ | |
5885 | if (is_root) { | |
e6142f2e | 5886 | if (set_consumer_sockets(&kconsumer_data)) { |
4a15001e MD |
5887 | retval = -1; |
5888 | goto exit_init_data; | |
7753dea8 MD |
5889 | } |
5890 | ||
a88df331 | 5891 | /* Setup kernel tracer */ |
e6142f2e | 5892 | if (!config.no_kernel) { |
4fba7219 | 5893 | init_kernel_tracer(); |
89588270 DG |
5894 | if (kernel_tracer_fd >= 0) { |
5895 | ret = syscall_init_table(); | |
5896 | if (ret < 0) { | |
4a15001e MD |
5897 | ERR("Unable to populate syscall table. " |
5898 | "Syscall tracing won't work " | |
5899 | "for this session daemon."); | |
89588270 | 5900 | } |
834978fd | 5901 | } |
4fba7219 | 5902 | } |
a88df331 DG |
5903 | |
5904 | /* Set ulimit for open files */ | |
5905 | set_ulimit(); | |
fac6795d | 5906 | } |
4063050c MD |
5907 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5908 | lttng_fd_init(); | |
fac6795d | 5909 | |
e6142f2e | 5910 | if (set_consumer_sockets(&ustconsumer64_data)) { |
4a15001e MD |
5911 | retval = -1; |
5912 | goto exit_init_data; | |
67e40797 DG |
5913 | } |
5914 | ||
e6142f2e | 5915 | if (set_consumer_sockets(&ustconsumer32_data)) { |
4a15001e MD |
5916 | retval = -1; |
5917 | goto exit_init_data; | |
67e40797 DG |
5918 | } |
5919 | ||
d6f42150 | 5920 | /* Setup the needed unix socket */ |
4a15001e MD |
5921 | if (init_daemon_socket()) { |
5922 | retval = -1; | |
5923 | goto exit_init_data; | |
fac6795d DG |
5924 | } |
5925 | ||
5926 | /* Set credentials to socket */ | |
e6142f2e | 5927 | if (is_root && set_permissions(config.rundir.value)) { |
4a15001e MD |
5928 | retval = -1; |
5929 | goto exit_init_data; | |
fac6795d DG |
5930 | } |
5931 | ||
5b8719f5 | 5932 | /* Get parent pid if -S, --sig-parent is specified. */ |
e6142f2e | 5933 | if (config.sig_parent) { |
5b8719f5 DG |
5934 | ppid = getppid(); |
5935 | } | |
5936 | ||
7a485870 | 5937 | /* Setup the kernel pipe for waking up the kernel thread */ |
e6142f2e | 5938 | if (is_root && !config.no_kernel) { |
4a15001e MD |
5939 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
5940 | retval = -1; | |
5941 | goto exit_init_data; | |
6620da75 | 5942 | } |
7a485870 DG |
5943 | } |
5944 | ||
099e26bd | 5945 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
5946 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
5947 | retval = -1; | |
5948 | goto exit_init_data; | |
099e26bd DG |
5949 | } |
5950 | ||
d0b96690 | 5951 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
5952 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
5953 | retval = -1; | |
5954 | goto exit_init_data; | |
d0b96690 DG |
5955 | } |
5956 | ||
7972aab2 DG |
5957 | /* Initialize global buffer per UID and PID registry. */ |
5958 | buffer_reg_init_uid_registry(); | |
5959 | buffer_reg_init_pid_registry(); | |
5960 | ||
099e26bd | 5961 | /* Init UST command queue. */ |
8bdee6e2 | 5962 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 5963 | |
273ea72c | 5964 | /* |
4a15001e MD |
5965 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
5966 | * is statically declared in session.c | |
273ea72c | 5967 | */ |
54d01ffb | 5968 | session_list_ptr = session_get_list(); |
b5541356 | 5969 | |
2f77fc4b | 5970 | cmd_init(); |
00e2e675 | 5971 | |
ae9e45b3 DG |
5972 | /* Check for the application socket timeout env variable. */ |
5973 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5974 | if (env_app_timeout) { | |
e6142f2e | 5975 | config.app_socket_timeout = atoi(env_app_timeout); |
ae9e45b3 | 5976 | } else { |
e6142f2e | 5977 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
ae9e45b3 DG |
5978 | } |
5979 | ||
4a15001e MD |
5980 | ret = write_pidfile(); |
5981 | if (ret) { | |
5982 | ERR("Error in write_pidfile"); | |
5983 | retval = -1; | |
5984 | goto exit_init_data; | |
5985 | } | |
35f90c40 | 5986 | |
554831e7 MD |
5987 | /* Initialize communication library */ |
5988 | lttcomm_init(); | |
4a15001e | 5989 | /* Initialize TCP timeout values */ |
d831c249 | 5990 | lttcomm_inet_init(); |
554831e7 | 5991 | |
ef367a93 | 5992 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
5993 | retval = -1; |
5994 | goto exit_init_data; | |
ef367a93 | 5995 | } |
e6142f2e | 5996 | load_info->path = config.load_session_path.value; |
ef367a93 | 5997 | |
12b4fb37 | 5998 | /* Create health-check thread. */ |
1a1a34b4 | 5999 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 6000 | thread_manage_health, (void *) NULL); |
4a15001e MD |
6001 | if (ret) { |
6002 | errno = ret; | |
44a5e5eb | 6003 | PERROR("pthread_create health"); |
4a15001e | 6004 | retval = -1; |
44a5e5eb DG |
6005 | goto exit_health; |
6006 | } | |
6007 | ||
90936dcf JD |
6008 | /* |
6009 | * The rotation thread needs the notification thread to be ready before | |
6010 | * creating the rotate_notification_channel, so we use this semaphore as | |
6011 | * a rendez-vous point. | |
6012 | */ | |
6013 | sem_init(¬ification_thread_ready, 0, 0); | |
6014 | ||
b3530820 JG |
6015 | /* notification_thread_data acquires the pipes' read side. */ |
6016 | notification_thread_handle = notification_thread_handle_create( | |
6017 | ust32_channel_monitor_pipe, | |
6018 | ust64_channel_monitor_pipe, | |
90936dcf JD |
6019 | kernel_channel_monitor_pipe, |
6020 | ¬ification_thread_ready); | |
b3530820 JG |
6021 | if (!notification_thread_handle) { |
6022 | retval = -1; | |
6023 | ERR("Failed to create notification thread shared data"); | |
6024 | stop_threads(); | |
6025 | goto exit_notification; | |
6026 | } | |
6027 | ||
6028 | /* Create notification thread. */ | |
6029 | ret = pthread_create(¬ification_thread, default_pthread_attr(), | |
6030 | thread_notification, notification_thread_handle); | |
6031 | if (ret) { | |
6032 | errno = ret; | |
6033 | PERROR("pthread_create notification"); | |
6034 | retval = -1; | |
6035 | stop_threads(); | |
6036 | goto exit_notification; | |
6037 | } | |
99611076 | 6038 | notification_thread_launched = true; |
b3530820 | 6039 | |
d086f507 JD |
6040 | /* Create timer thread. */ |
6041 | ret = pthread_create(&timer_thread, default_pthread_attr(), | |
92816cc3 | 6042 | timer_thread_func, &timer_thread_ctx); |
d086f507 JD |
6043 | if (ret) { |
6044 | errno = ret; | |
6045 | PERROR("pthread_create timer"); | |
6046 | retval = -1; | |
6047 | stop_threads(); | |
6048 | goto exit_notification; | |
6049 | } | |
99611076 | 6050 | timer_thread_launched = true; |
d086f507 | 6051 | |
db66e574 JD |
6052 | /* rotation_thread_data acquires the pipes' read side. */ |
6053 | rotation_thread_handle = rotation_thread_handle_create( | |
90936dcf JD |
6054 | rotation_timer_queue, |
6055 | notification_thread_handle, | |
6056 | ¬ification_thread_ready); | |
db66e574 JD |
6057 | if (!rotation_thread_handle) { |
6058 | retval = -1; | |
6059 | ERR("Failed to create rotation thread shared data"); | |
6060 | stop_threads(); | |
6061 | goto exit_rotation; | |
6062 | } | |
db66e574 JD |
6063 | |
6064 | /* Create rotation thread. */ | |
6065 | ret = pthread_create(&rotation_thread, default_pthread_attr(), | |
6066 | thread_rotation, rotation_thread_handle); | |
6067 | if (ret) { | |
6068 | errno = ret; | |
6069 | PERROR("pthread_create rotation"); | |
6070 | retval = -1; | |
6071 | stop_threads(); | |
6072 | goto exit_rotation; | |
6073 | } | |
99611076 | 6074 | rotation_thread_launched = true; |
db66e574 | 6075 | |
cf3af59e | 6076 | /* Create thread to manage the client socket */ |
1a1a34b4 | 6077 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 6078 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
6079 | if (ret) { |
6080 | errno = ret; | |
76d7553f | 6081 | PERROR("pthread_create clients"); |
4a15001e | 6082 | retval = -1; |
b3530820 | 6083 | stop_threads(); |
cf3af59e MD |
6084 | goto exit_client; |
6085 | } | |
fac6795d | 6086 | |
099e26bd | 6087 | /* Create thread to dispatch registration */ |
1a1a34b4 | 6088 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 6089 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
6090 | if (ret) { |
6091 | errno = ret; | |
76d7553f | 6092 | PERROR("pthread_create dispatch"); |
4a15001e | 6093 | retval = -1; |
b3530820 | 6094 | stop_threads(); |
099e26bd DG |
6095 | goto exit_dispatch; |
6096 | } | |
6097 | ||
6098 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 6099 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 6100 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
6101 | if (ret) { |
6102 | errno = ret; | |
76d7553f | 6103 | PERROR("pthread_create registration"); |
4a15001e | 6104 | retval = -1; |
b3530820 | 6105 | stop_threads(); |
099e26bd DG |
6106 | goto exit_reg_apps; |
6107 | } | |
6108 | ||
cf3af59e | 6109 | /* Create thread to manage application socket */ |
1a1a34b4 | 6110 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 6111 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
6112 | if (ret) { |
6113 | errno = ret; | |
d0b96690 | 6114 | PERROR("pthread_create apps"); |
4a15001e | 6115 | retval = -1; |
b3530820 | 6116 | stop_threads(); |
d0b96690 DG |
6117 | goto exit_apps; |
6118 | } | |
6119 | ||
6120 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 6121 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 6122 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
6123 | if (ret) { |
6124 | errno = ret; | |
f5c32ef1 | 6125 | PERROR("pthread_create notify"); |
4a15001e | 6126 | retval = -1; |
b3530820 | 6127 | stop_threads(); |
9563b0ad | 6128 | goto exit_apps_notify; |
cf3af59e | 6129 | } |
fac6795d | 6130 | |
022d91ba | 6131 | /* Create agent registration thread. */ |
1a1a34b4 | 6132 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 6133 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
6134 | if (ret) { |
6135 | errno = ret; | |
022d91ba | 6136 | PERROR("pthread_create agent"); |
4a15001e | 6137 | retval = -1; |
b3530820 | 6138 | stop_threads(); |
022d91ba | 6139 | goto exit_agent_reg; |
4d076222 DG |
6140 | } |
6141 | ||
6620da75 | 6142 | /* Don't start this thread if kernel tracing is not requested nor root */ |
e6142f2e | 6143 | if (is_root && !config.no_kernel) { |
6620da75 | 6144 | /* Create kernel thread to manage kernel event */ |
1a1a34b4 | 6145 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 6146 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
6147 | if (ret) { |
6148 | errno = ret; | |
6620da75 | 6149 | PERROR("pthread_create kernel"); |
4a15001e | 6150 | retval = -1; |
b3530820 | 6151 | stop_threads(); |
6620da75 DG |
6152 | goto exit_kernel; |
6153 | } | |
ef367a93 | 6154 | } |
7a485870 | 6155 | |
4a15001e | 6156 | /* Create session loading thread. */ |
1a1a34b4 MJ |
6157 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
6158 | thread_load_session, load_info); | |
4a15001e MD |
6159 | if (ret) { |
6160 | errno = ret; | |
6161 | PERROR("pthread_create load_session_thread"); | |
6162 | retval = -1; | |
b3530820 | 6163 | stop_threads(); |
4a15001e MD |
6164 | goto exit_load_session; |
6165 | } | |
6166 | ||
6167 | /* | |
6168 | * This is where we start awaiting program completion (e.g. through | |
6169 | * signal that asks threads to teardown). | |
6170 | */ | |
6171 | ||
6172 | ret = pthread_join(load_session_thread, &status); | |
6173 | if (ret) { | |
6174 | errno = ret; | |
6175 | PERROR("pthread_join load_session_thread"); | |
6176 | retval = -1; | |
6177 | } | |
6178 | exit_load_session: | |
ef367a93 | 6179 | |
e6142f2e | 6180 | if (is_root && !config.no_kernel) { |
6620da75 | 6181 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6182 | if (ret) { |
6183 | errno = ret; | |
6620da75 | 6184 | PERROR("pthread_join"); |
4a15001e | 6185 | retval = -1; |
6620da75 | 6186 | } |
fac6795d | 6187 | } |
cf3af59e | 6188 | exit_kernel: |
4a15001e | 6189 | |
022d91ba | 6190 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6191 | if (ret) { |
6192 | errno = ret; | |
022d91ba | 6193 | PERROR("pthread_join agent"); |
4a15001e | 6194 | retval = -1; |
4d076222 | 6195 | } |
022d91ba | 6196 | exit_agent_reg: |
4a15001e | 6197 | |
9563b0ad | 6198 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6199 | if (ret) { |
6200 | errno = ret; | |
9563b0ad | 6201 | PERROR("pthread_join apps notify"); |
4a15001e | 6202 | retval = -1; |
9563b0ad | 6203 | } |
9563b0ad | 6204 | exit_apps_notify: |
4a15001e | 6205 | |
cf3af59e | 6206 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6207 | if (ret) { |
6208 | errno = ret; | |
9563b0ad | 6209 | PERROR("pthread_join apps"); |
4a15001e | 6210 | retval = -1; |
cf3af59e | 6211 | } |
cf3af59e | 6212 | exit_apps: |
4a15001e | 6213 | |
099e26bd | 6214 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6215 | if (ret) { |
6216 | errno = ret; | |
76d7553f | 6217 | PERROR("pthread_join"); |
4a15001e | 6218 | retval = -1; |
099e26bd | 6219 | } |
099e26bd | 6220 | exit_reg_apps: |
4a15001e | 6221 | |
772b8f4d MD |
6222 | /* |
6223 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6224 | * we don't leak applications in the queue. | |
6225 | */ | |
099e26bd | 6226 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6227 | if (ret) { |
6228 | errno = ret; | |
76d7553f | 6229 | PERROR("pthread_join"); |
4a15001e | 6230 | retval = -1; |
099e26bd | 6231 | } |
099e26bd | 6232 | exit_dispatch: |
4a15001e | 6233 | |
cf3af59e | 6234 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6235 | if (ret) { |
6236 | errno = ret; | |
76d7553f | 6237 | PERROR("pthread_join"); |
4a15001e | 6238 | retval = -1; |
cf3af59e | 6239 | } |
a88df331 | 6240 | |
b3530820 | 6241 | exit_client: |
db66e574 | 6242 | exit_rotation: |
b3530820 | 6243 | exit_notification: |
90936dcf | 6244 | sem_destroy(¬ification_thread_ready); |
4a15001e MD |
6245 | ret = pthread_join(health_thread, &status); |
6246 | if (ret) { | |
6247 | errno = ret; | |
6248 | PERROR("pthread_join health thread"); | |
6249 | retval = -1; | |
06f525de DG |
6250 | } |
6251 | ||
b3530820 | 6252 | exit_health: |
4a15001e | 6253 | exit_init_data: |
4d62fbf8 MD |
6254 | /* |
6255 | * Wait for all pending call_rcu work to complete before tearing | |
6256 | * down data structures. call_rcu worker may be trying to | |
6257 | * perform lookups in those structures. | |
6258 | */ | |
6259 | rcu_barrier(); | |
4a15001e MD |
6260 | /* |
6261 | * sessiond_cleanup() is called when no other thread is running, except | |
6262 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6263 | */ | |
6264 | rcu_thread_online(); | |
6265 | sessiond_cleanup(); | |
06f525de | 6266 | |
c4d5de9d JG |
6267 | /* |
6268 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6269 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6270 | * the queue is empty before shutting down the clean-up thread. | |
6271 | */ | |
6272 | rcu_barrier(); | |
6273 | ||
b3530820 JG |
6274 | /* |
6275 | * The teardown of the notification system is performed after the | |
6276 | * session daemon's teardown in order to allow it to be notified | |
6277 | * of the active session and channels at the moment of the teardown. | |
6278 | */ | |
6279 | if (notification_thread_handle) { | |
99611076 | 6280 | if (notification_thread_launched) { |
6be1a386 JG |
6281 | notification_thread_command_quit( |
6282 | notification_thread_handle); | |
6283 | ret = pthread_join(notification_thread, &status); | |
6284 | if (ret) { | |
6285 | errno = ret; | |
6286 | PERROR("pthread_join notification thread"); | |
6287 | retval = -1; | |
6288 | } | |
3dec304b | 6289 | } |
6be1a386 | 6290 | notification_thread_handle_destroy(notification_thread_handle); |
b3530820 JG |
6291 | } |
6292 | ||
db66e574 | 6293 | if (rotation_thread_handle) { |
99611076 | 6294 | if (rotation_thread_launched) { |
db66e574 JD |
6295 | ret = pthread_join(rotation_thread, &status); |
6296 | if (ret) { | |
6297 | errno = ret; | |
6298 | PERROR("pthread_join rotation thread"); | |
6299 | retval = -1; | |
6300 | } | |
6301 | } | |
6302 | rotation_thread_handle_destroy(rotation_thread_handle); | |
6303 | } | |
6304 | ||
99611076 | 6305 | if (timer_thread_launched) { |
92816cc3 | 6306 | timer_exit(); |
d086f507 JD |
6307 | ret = pthread_join(timer_thread, &status); |
6308 | if (ret) { | |
6309 | errno = ret; | |
6310 | PERROR("pthread_join timer thread"); | |
6311 | retval = -1; | |
6312 | } | |
6313 | } | |
6314 | ||
6315 | /* | |
6316 | * After the rotation and timer thread have quit, we can safely destroy | |
6317 | * the rotation_timer_queue. | |
6318 | */ | |
92816cc3 | 6319 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
d086f507 | 6320 | |
b3530820 JG |
6321 | rcu_thread_offline(); |
6322 | rcu_unregister_thread(); | |
6323 | ||
5e97de00 | 6324 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6325 | if (ret) { |
4a15001e | 6326 | retval = -1; |
0b2dc8df | 6327 | } |
b3530820 JG |
6328 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
6329 | lttng_pipe_destroy(ust64_channel_monitor_pipe); | |
6330 | lttng_pipe_destroy(kernel_channel_monitor_pipe); | |
0b2dc8df | 6331 | exit_ht_cleanup: |
4a15001e | 6332 | |
4a15001e MD |
6333 | health_app_destroy(health_sessiond); |
6334 | exit_health_sessiond_cleanup: | |
7567352f | 6335 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6336 | |
6337 | exit_options: | |
f472090a | 6338 | sessiond_cleanup_lock_file(); |
4a15001e MD |
6339 | sessiond_cleanup_options(); |
6340 | ||
6341 | exit_set_signal_handler: | |
6342 | if (!retval) { | |
cf3af59e | 6343 | exit(EXIT_SUCCESS); |
4a15001e MD |
6344 | } else { |
6345 | exit(EXIT_FAILURE); | |
67e40797 | 6346 | } |
fac6795d | 6347 | } |