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 | ||
20 | #define _GNU_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> |
3bd1e081 | 40 | #include <config.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
db758600 DG |
44 | #include <common/defaults.h> |
45 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 46 | #include <common/futex.h> |
00e2e675 | 47 | #include <common/relayd/relayd.h> |
81b86775 | 48 | #include <common/utils.h> |
3ccdf997 | 49 | #include <common/daemonize.h> |
26296c48 | 50 | #include <common/config/config.h> |
fac6795d | 51 | |
10a8a223 | 52 | #include "lttng-sessiond.h" |
7972aab2 | 53 | #include "buffer-registry.h" |
54d01ffb | 54 | #include "channel.h" |
2f77fc4b | 55 | #include "cmd.h" |
00e2e675 | 56 | #include "consumer.h" |
099e26bd | 57 | #include "context.h" |
54d01ffb | 58 | #include "event.h" |
4771f025 | 59 | #include "kernel.h" |
f1e16794 | 60 | #include "kernel-consumer.h" |
096102bd | 61 | #include "modprobe.h" |
0fdd1e2c | 62 | #include "shm.h" |
1e307fab | 63 | #include "ust-ctl.h" |
00e2e675 | 64 | #include "ust-consumer.h" |
8e68d1c8 | 65 | #include "utils.h" |
4063050c | 66 | #include "fd-limit.h" |
8782cc74 | 67 | #include "health-sessiond.h" |
8ac94142 | 68 | #include "testpoint.h" |
d0b96690 | 69 | #include "ust-thread.h" |
4d076222 | 70 | #include "jul-thread.h" |
fac6795d | 71 | |
ebaeda94 MD |
72 | #define CONSUMERD_FILE "lttng-consumerd" |
73 | ||
fac6795d | 74 | const char *progname; |
6c71277b | 75 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
26296c48 JG |
76 | static int tracing_group_name_override; |
77 | static char *opt_pidfile; | |
5b8719f5 | 78 | static int opt_sig_parent; |
97e19046 | 79 | static int opt_verbose_consumer; |
72dd7491 | 80 | static int opt_daemon, opt_background; |
4fba7219 | 81 | static int opt_no_kernel; |
1d4b027a | 82 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 83 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
67e40797 | 84 | static char *rundir; |
3bd1e081 | 85 | |
0bb7724a DG |
86 | /* Set to 1 when a SIGUSR1 signal is received. */ |
87 | static int recv_child_signal; | |
88 | ||
a23ec3a7 DG |
89 | /* |
90 | * Consumer daemon specific control data. Every value not initialized here is | |
91 | * set to 0 by the static definition. | |
92 | */ | |
3bd1e081 MD |
93 | static struct consumer_data kconsumer_data = { |
94 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
95 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
96 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
97 | .err_sock = -1, |
98 | .cmd_sock = -1, | |
173af62f DG |
99 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
100 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
101 | .cond = PTHREAD_COND_INITIALIZER, |
102 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
108 | .err_sock = -1, |
109 | .cmd_sock = -1, | |
173af62f DG |
110 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
111 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
112 | .cond = PTHREAD_COND_INITIALIZER, |
113 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
114 | }; |
115 | static struct consumer_data ustconsumer32_data = { | |
116 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
117 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
118 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
119 | .err_sock = -1, |
120 | .cmd_sock = -1, | |
173af62f DG |
121 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
122 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
123 | .cond = PTHREAD_COND_INITIALIZER, |
124 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
125 | }; |
126 | ||
26296c48 JG |
127 | /* Command line options */ |
128 | static const struct option long_options[] = { | |
129 | { "client-sock", 1, 0, 'c' }, | |
130 | { "apps-sock", 1, 0, 'a' }, | |
131 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, | |
132 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
133 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
134 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
135 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
136 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
137 | { "consumerd32-path", 1, 0, 'u' }, | |
138 | { "consumerd32-libdir", 1, 0, 'U' }, | |
139 | { "consumerd64-path", 1, 0, 't' }, | |
140 | { "consumerd64-libdir", 1, 0, 'T' }, | |
141 | { "daemonize", 0, 0, 'd' }, | |
72dd7491 | 142 | { "background", 0, 0, 'b' }, |
26296c48 JG |
143 | { "sig-parent", 0, 0, 'S' }, |
144 | { "help", 0, 0, 'h' }, | |
145 | { "group", 1, 0, 'g' }, | |
146 | { "version", 0, 0, 'V' }, | |
147 | { "quiet", 0, 0, 'q' }, | |
148 | { "verbose", 0, 0, 'v' }, | |
149 | { "verbose-consumer", 0, 0, 'Z' }, | |
150 | { "no-kernel", 0, 0, 'N' }, | |
151 | { "pidfile", 1, 0, 'p' }, | |
152 | { "jul-tcp-port", 1, 0, 'J' }, | |
153 | { "config", 1, 0, 'f' }, | |
154 | { NULL, 0, 0, 0 } | |
155 | }; | |
156 | ||
157 | /* Command line options to ignore from configuration file */ | |
158 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
159 | ||
26c9d55e | 160 | /* Shared between threads */ |
099e26bd | 161 | static int dispatch_thread_exit; |
fac6795d | 162 | |
54d01ffb DG |
163 | /* Global application Unix socket path */ |
164 | static char apps_unix_sock_path[PATH_MAX]; | |
165 | /* Global client Unix socket path */ | |
166 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
167 | /* global wait shm path for UST */ |
168 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
169 | /* Global health check unix path */ |
170 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 171 | |
1d4b027a | 172 | /* Sockets and FDs */ |
a4b35e07 MD |
173 | static int client_sock = -1; |
174 | static int apps_sock = -1; | |
2f77fc4b | 175 | int kernel_tracer_fd = -1; |
76d7553f | 176 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 177 | |
273ea72c DG |
178 | /* |
179 | * Quit pipe for all threads. This permits a single cancellation point | |
180 | * for all threads when receiving an event on the pipe. | |
181 | */ | |
76d7553f | 182 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 183 | |
099e26bd DG |
184 | /* |
185 | * This pipe is used to inform the thread managing application communication | |
186 | * that a command is queued and ready to be processed. | |
187 | */ | |
76d7553f | 188 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 189 | |
d0b96690 DG |
190 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
191 | ||
1d4b027a | 192 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 193 | static pthread_t apps_thread; |
d0b96690 | 194 | static pthread_t apps_notify_thread; |
099e26bd | 195 | static pthread_t reg_apps_thread; |
1d4b027a | 196 | static pthread_t client_thread; |
7a485870 | 197 | static pthread_t kernel_thread; |
099e26bd | 198 | static pthread_t dispatch_thread; |
44a5e5eb | 199 | static pthread_t health_thread; |
0b2dc8df | 200 | static pthread_t ht_cleanup_thread; |
4d076222 | 201 | static pthread_t jul_reg_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 | * | |
207 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
208 | * this queue and the wait/wake scheme. | |
209 | */ | |
210 | static struct ust_cmd_queue ust_cmd_queue; | |
211 | ||
b5541356 DG |
212 | /* |
213 | * Pointer initialized before thread creation. | |
214 | * | |
215 | * This points to the tracing session list containing the session count and a | |
216 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
217 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 218 | * |
d063d709 | 219 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 220 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
221 | */ |
222 | static struct ltt_session_list *session_list_ptr; | |
223 | ||
7753dea8 MD |
224 | int ust_consumerd64_fd = -1; |
225 | int ust_consumerd32_fd = -1; | |
226 | ||
fb6f1fa2 YB |
227 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
228 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
229 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
230 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
26296c48 JG |
231 | static int consumerd32_bin_override; |
232 | static int consumerd64_bin_override; | |
233 | static int consumerd32_libdir_override; | |
234 | static int consumerd64_libdir_override; | |
fb09408a | 235 | |
2f77fc4b DG |
236 | static const char *module_proc_lttng = "/proc/lttng"; |
237 | ||
5c827ce0 DG |
238 | /* |
239 | * Consumer daemon state which is changed when spawning it, killing it or in | |
240 | * case of a fatal error. | |
241 | */ | |
242 | enum consumerd_state { | |
243 | CONSUMER_STARTED = 1, | |
244 | CONSUMER_STOPPED = 2, | |
245 | CONSUMER_ERROR = 3, | |
246 | }; | |
247 | ||
248 | /* | |
249 | * This consumer daemon state is used to validate if a client command will be | |
250 | * able to reach the consumer. If not, the client is informed. For instance, | |
251 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
252 | * error to the client. | |
253 | * | |
254 | * The following example shows a possible race condition of this scheme: | |
255 | * | |
256 | * consumer thread error happens | |
257 | * client cmd arrives | |
258 | * client cmd checks state -> still OK | |
259 | * consumer thread exit, sets error | |
260 | * client cmd try to talk to consumer | |
261 | * ... | |
262 | * | |
263 | * However, since the consumer is a different daemon, we have no way of making | |
264 | * sure the command will reach it safely even with this state flag. This is why | |
265 | * we consider that up to the state validation during command processing, the | |
266 | * command is safe. After that, we can not guarantee the correctness of the | |
267 | * client request vis-a-vis the consumer. | |
268 | */ | |
269 | static enum consumerd_state ust_consumerd_state; | |
270 | static enum consumerd_state kernel_consumerd_state; | |
271 | ||
ae9e45b3 DG |
272 | /* |
273 | * Socket timeout for receiving and sending in seconds. | |
274 | */ | |
275 | static int app_socket_timeout; | |
276 | ||
12744796 DG |
277 | /* Set in main() with the current page size. */ |
278 | long page_size; | |
279 | ||
8782cc74 MD |
280 | /* Application health monitoring */ |
281 | struct health_app *health_sessiond; | |
282 | ||
4d076222 DG |
283 | /* JUL TCP port for registration. Used by the JUL thread. */ |
284 | unsigned int jul_tcp_port = DEFAULT_JUL_TCP_PORT; | |
285 | ||
f43f95a9 DG |
286 | /* Am I root or not. */ |
287 | int is_root; /* Set to 1 if the daemon is running as root */ | |
288 | ||
26296c48 JG |
289 | const char * const config_section_name = "sessiond"; |
290 | ||
97bc1426 MD |
291 | /* |
292 | * Whether sessiond is ready for commands/health check requests. | |
293 | * NR_LTTNG_SESSIOND_READY must match the number of calls to | |
294 | * lttng_sessiond_notify_ready(). | |
295 | */ | |
296 | #define NR_LTTNG_SESSIOND_READY 2 | |
297 | int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY; | |
298 | ||
299 | /* Notify parents that we are ready for cmd and health check */ | |
300 | static | |
301 | void lttng_sessiond_notify_ready(void) | |
302 | { | |
303 | if (uatomic_sub_return(<tng_sessiond_ready, 1) == 0) { | |
304 | /* | |
305 | * Notify parent pid that we are ready to accept command | |
306 | * for client side. This ppid is the one from the | |
307 | * external process that spawned us. | |
308 | */ | |
309 | if (opt_sig_parent) { | |
310 | kill(ppid, SIGUSR1); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Notify the parent of the fork() process that we are | |
315 | * ready. | |
316 | */ | |
72dd7491 | 317 | if (opt_daemon || opt_background) { |
97bc1426 MD |
318 | kill(child_ppid, SIGUSR1); |
319 | } | |
320 | } | |
321 | } | |
322 | ||
fb09408a | 323 | static |
7753dea8 | 324 | void setup_consumerd_path(void) |
fb09408a | 325 | { |
fc7a59ce | 326 | const char *bin, *libdir; |
fb09408a | 327 | |
7753dea8 MD |
328 | /* |
329 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
330 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
331 | * has not been defined. | |
7753dea8 | 332 | */ |
ebaeda94 | 333 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
334 | if (!consumerd32_bin[0]) { |
335 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
336 | } |
337 | if (!consumerd32_libdir[0]) { | |
338 | consumerd32_libdir = INSTALL_LIB_PATH; | |
339 | } | |
340 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
341 | if (!consumerd64_bin[0]) { |
342 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 343 | } |
ebaeda94 MD |
344 | if (!consumerd64_libdir[0]) { |
345 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
346 | } |
347 | #else | |
348 | #error "Unknown bitness" | |
349 | #endif | |
350 | ||
fb09408a MD |
351 | /* |
352 | * runtime env. var. overrides the build default. | |
353 | */ | |
fc7a59ce AM |
354 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
355 | if (bin) { | |
356 | consumerd32_bin = bin; | |
7753dea8 | 357 | } |
fc7a59ce AM |
358 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
359 | if (bin) { | |
360 | consumerd64_bin = bin; | |
ebaeda94 | 361 | } |
72f579ee | 362 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
363 | if (libdir) { |
364 | consumerd32_libdir = libdir; | |
365 | } | |
72f579ee | 366 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
367 | if (libdir) { |
368 | consumerd64_libdir = libdir; | |
fb09408a MD |
369 | } |
370 | } | |
371 | ||
5eb91c98 DG |
372 | /* |
373 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
374 | */ | |
d0b96690 | 375 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
376 | { |
377 | int ret; | |
378 | ||
d0b96690 | 379 | assert(events); |
5eb91c98 DG |
380 | |
381 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
382 | if (ret < 0) { | |
383 | goto error; | |
384 | } | |
385 | ||
386 | /* Add quit pipe */ | |
d0b96690 | 387 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
388 | if (ret < 0) { |
389 | goto error; | |
390 | } | |
391 | ||
392 | return 0; | |
393 | ||
394 | error: | |
395 | return ret; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Check if the thread quit pipe was triggered. | |
400 | * | |
401 | * Return 1 if it was triggered else 0; | |
402 | */ | |
d0b96690 | 403 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
404 | { |
405 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
406 | return 1; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
273ea72c | 412 | /* |
5eb91c98 | 413 | * Init thread quit pipe. |
273ea72c DG |
414 | * |
415 | * Return -1 on error or 0 if all pipes are created. | |
416 | */ | |
417 | static int init_thread_quit_pipe(void) | |
418 | { | |
730389d9 | 419 | int ret, i; |
273ea72c | 420 | |
730389d9 | 421 | ret = pipe(thread_quit_pipe); |
273ea72c | 422 | if (ret < 0) { |
730389d9 | 423 | PERROR("thread quit pipe"); |
273ea72c DG |
424 | goto error; |
425 | } | |
426 | ||
730389d9 DG |
427 | for (i = 0; i < 2; i++) { |
428 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
429 | if (ret < 0) { | |
430 | PERROR("fcntl"); | |
431 | goto error; | |
432 | } | |
433 | } | |
434 | ||
273ea72c DG |
435 | error: |
436 | return ret; | |
437 | } | |
438 | ||
099e26bd DG |
439 | /* |
440 | * Stop all threads by closing the thread quit pipe. | |
441 | */ | |
cf3af59e MD |
442 | static void stop_threads(void) |
443 | { | |
5eb91c98 DG |
444 | int ret; |
445 | ||
cf3af59e MD |
446 | /* Stopping all threads */ |
447 | DBG("Terminating all threads"); | |
54d01ffb | 448 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
449 | if (ret < 0) { |
450 | ERR("write error on thread quit pipe"); | |
451 | } | |
452 | ||
099e26bd | 453 | /* Dispatch thread */ |
26c9d55e | 454 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 455 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
456 | } |
457 | ||
e975f9f8 DG |
458 | /* |
459 | * Close every consumer sockets. | |
460 | */ | |
461 | static void close_consumer_sockets(void) | |
462 | { | |
463 | int ret; | |
464 | ||
465 | if (kconsumer_data.err_sock >= 0) { | |
466 | ret = close(kconsumer_data.err_sock); | |
467 | if (ret < 0) { | |
468 | PERROR("kernel consumer err_sock close"); | |
469 | } | |
470 | } | |
471 | if (ustconsumer32_data.err_sock >= 0) { | |
472 | ret = close(ustconsumer32_data.err_sock); | |
473 | if (ret < 0) { | |
a76cbd9f | 474 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
475 | } |
476 | } | |
477 | if (ustconsumer64_data.err_sock >= 0) { | |
478 | ret = close(ustconsumer64_data.err_sock); | |
479 | if (ret < 0) { | |
a76cbd9f | 480 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
481 | } |
482 | } | |
483 | if (kconsumer_data.cmd_sock >= 0) { | |
484 | ret = close(kconsumer_data.cmd_sock); | |
485 | if (ret < 0) { | |
486 | PERROR("kernel consumer cmd_sock close"); | |
487 | } | |
488 | } | |
489 | if (ustconsumer32_data.cmd_sock >= 0) { | |
490 | ret = close(ustconsumer32_data.cmd_sock); | |
491 | if (ret < 0) { | |
a76cbd9f | 492 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
493 | } |
494 | } | |
495 | if (ustconsumer64_data.cmd_sock >= 0) { | |
496 | ret = close(ustconsumer64_data.cmd_sock); | |
497 | if (ret < 0) { | |
a76cbd9f | 498 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
499 | } |
500 | } | |
501 | } | |
502 | ||
fac6795d | 503 | /* |
d063d709 | 504 | * Cleanup the daemon |
fac6795d | 505 | */ |
cf3af59e | 506 | static void cleanup(void) |
fac6795d | 507 | { |
ef599319 | 508 | int ret; |
af9737e9 | 509 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 510 | char path[PATH_MAX]; |
fac6795d | 511 | |
1d4b027a | 512 | DBG("Cleaning up"); |
e07ae692 | 513 | |
4e449f3f MD |
514 | /* |
515 | * Close the thread quit pipe. It has already done its job, | |
516 | * since we are now called. | |
517 | */ | |
2f77fc4b DG |
518 | utils_close_pipe(thread_quit_pipe); |
519 | ||
35f90c40 DG |
520 | /* |
521 | * If opt_pidfile is undefined, the default file will be wiped when | |
522 | * removing the rundir. | |
523 | */ | |
524 | if (opt_pidfile) { | |
525 | ret = remove(opt_pidfile); | |
526 | if (ret < 0) { | |
527 | PERROR("remove pidfile %s", opt_pidfile); | |
528 | } | |
529 | } | |
530 | ||
8c6c56c2 MD |
531 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
532 | ||
533 | /* sessiond */ | |
534 | snprintf(path, PATH_MAX, | |
535 | "%s/%s", | |
536 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
537 | DBG("Removing %s", path); | |
538 | (void) unlink(path); | |
539 | ||
cd9290dd DG |
540 | snprintf(path, PATH_MAX, "%s/%s", rundir, |
541 | DEFAULT_LTTNG_SESSIOND_JULPORT_FILE); | |
542 | DBG("Removing %s", path); | |
543 | (void) unlink(path); | |
544 | ||
8c6c56c2 MD |
545 | /* kconsumerd */ |
546 | snprintf(path, PATH_MAX, | |
547 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
548 | rundir); | |
549 | DBG("Removing %s", path); | |
550 | (void) unlink(path); | |
551 | ||
552 | snprintf(path, PATH_MAX, | |
553 | DEFAULT_KCONSUMERD_PATH, | |
554 | rundir); | |
555 | DBG("Removing directory %s", path); | |
556 | (void) rmdir(path); | |
557 | ||
558 | /* ust consumerd 32 */ | |
559 | snprintf(path, PATH_MAX, | |
560 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
561 | rundir); | |
562 | DBG("Removing %s", path); | |
563 | (void) unlink(path); | |
564 | ||
565 | snprintf(path, PATH_MAX, | |
566 | DEFAULT_USTCONSUMERD32_PATH, | |
567 | rundir); | |
568 | DBG("Removing directory %s", path); | |
569 | (void) rmdir(path); | |
570 | ||
571 | /* ust consumerd 64 */ | |
572 | snprintf(path, PATH_MAX, | |
573 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
574 | rundir); | |
575 | DBG("Removing %s", path); | |
576 | (void) unlink(path); | |
577 | ||
578 | snprintf(path, PATH_MAX, | |
579 | DEFAULT_USTCONSUMERD64_PATH, | |
580 | rundir); | |
581 | DBG("Removing directory %s", path); | |
582 | (void) rmdir(path); | |
5461b305 | 583 | |
dcbcae3e MD |
584 | /* |
585 | * We do NOT rmdir rundir because there are other processes | |
586 | * using it, for instance lttng-relayd, which can start in | |
587 | * parallel with this teardown. | |
588 | */ | |
589 | ||
bd69add2 | 590 | free(rundir); |
5461b305 | 591 | |
99bab54f | 592 | DBG("Cleaning up all sessions"); |
fac6795d | 593 | |
b5541356 | 594 | /* Destroy session list mutex */ |
273ea72c DG |
595 | if (session_list_ptr != NULL) { |
596 | pthread_mutex_destroy(&session_list_ptr->lock); | |
597 | ||
598 | /* Cleanup ALL session */ | |
54d01ffb DG |
599 | cds_list_for_each_entry_safe(sess, stmp, |
600 | &session_list_ptr->head, list) { | |
2f77fc4b | 601 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
602 | } |
603 | } | |
604 | ||
099e26bd | 605 | DBG("Closing all UST sockets"); |
56fff090 | 606 | ust_app_clean_list(); |
7972aab2 | 607 | buffer_reg_destroy_registries(); |
099e26bd | 608 | |
4fba7219 DG |
609 | if (is_root && !opt_no_kernel) { |
610 | DBG2("Closing kernel fd"); | |
a4b35e07 | 611 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
612 | ret = close(kernel_tracer_fd); |
613 | if (ret) { | |
614 | PERROR("close"); | |
615 | } | |
a4b35e07 | 616 | } |
2f50c8a3 | 617 | DBG("Unloading kernel modules"); |
096102bd | 618 | modprobe_remove_lttng_all(); |
2f50c8a3 | 619 | } |
2f77fc4b | 620 | |
e975f9f8 DG |
621 | close_consumer_sockets(); |
622 | ||
26296c48 JG |
623 | /* |
624 | * If the override option is set, the pointer points to a *non* const thus | |
625 | * freeing it even though the variable type is set to const. | |
626 | */ | |
627 | if (tracing_group_name_override) { | |
628 | free((void *) tracing_group_name); | |
629 | } | |
630 | if (consumerd32_bin_override) { | |
631 | free((void *) consumerd32_bin); | |
632 | } | |
633 | if (consumerd64_bin_override) { | |
634 | free((void *) consumerd64_bin); | |
635 | } | |
636 | if (consumerd32_libdir_override) { | |
637 | free((void *) consumerd32_libdir); | |
638 | } | |
639 | if (consumerd64_libdir_override) { | |
640 | free((void *) consumerd64_libdir); | |
641 | } | |
642 | ||
643 | if (opt_pidfile) { | |
644 | free(opt_pidfile); | |
645 | } | |
646 | ||
421cb601 | 647 | /* <fun> */ |
f56a39af | 648 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
649 | "Matthew, BEET driven development works!%c[%dm", |
650 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
651 | /* </fun> */ | |
fac6795d DG |
652 | } |
653 | ||
e065084a | 654 | /* |
d063d709 | 655 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 656 | * |
d063d709 | 657 | * Return lttcomm error code. |
e065084a DG |
658 | */ |
659 | static int send_unix_sock(int sock, void *buf, size_t len) | |
660 | { | |
661 | /* Check valid length */ | |
c617c0c6 | 662 | if (len == 0) { |
e065084a DG |
663 | return -1; |
664 | } | |
665 | ||
666 | return lttcomm_send_unix_sock(sock, buf, len); | |
667 | } | |
668 | ||
5461b305 | 669 | /* |
d063d709 | 670 | * Free memory of a command context structure. |
5461b305 | 671 | */ |
a2fb29a5 | 672 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 673 | { |
a2fb29a5 DG |
674 | DBG("Clean command context structure"); |
675 | if (*cmd_ctx) { | |
676 | if ((*cmd_ctx)->llm) { | |
677 | free((*cmd_ctx)->llm); | |
5461b305 | 678 | } |
a2fb29a5 DG |
679 | if ((*cmd_ctx)->lsm) { |
680 | free((*cmd_ctx)->lsm); | |
5461b305 | 681 | } |
a2fb29a5 DG |
682 | free(*cmd_ctx); |
683 | *cmd_ctx = NULL; | |
5461b305 DG |
684 | } |
685 | } | |
686 | ||
fac6795d | 687 | /* |
0fdd1e2c | 688 | * Notify UST applications using the shm mmap futex. |
fac6795d | 689 | */ |
0fdd1e2c | 690 | static int notify_ust_apps(int active) |
fac6795d | 691 | { |
0fdd1e2c | 692 | char *wait_shm_mmap; |
fac6795d | 693 | |
0fdd1e2c | 694 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 695 | |
0fdd1e2c DG |
696 | /* See shm.c for this call implying mmap, shm and futex calls */ |
697 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
698 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
699 | goto error; |
700 | } | |
701 | ||
0fdd1e2c DG |
702 | /* Wake waiting process */ |
703 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
704 | ||
705 | /* Apps notified successfully */ | |
706 | return 0; | |
fac6795d DG |
707 | |
708 | error: | |
0fdd1e2c | 709 | return -1; |
fac6795d DG |
710 | } |
711 | ||
e065084a | 712 | /* |
d063d709 DG |
713 | * Setup the outgoing data buffer for the response (llm) by allocating the |
714 | * right amount of memory and copying the original information from the lsm | |
715 | * structure. | |
ca95a216 | 716 | * |
d063d709 | 717 | * Return total size of the buffer pointed by buf. |
ca95a216 | 718 | */ |
5461b305 | 719 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 720 | { |
f3ed775e | 721 | int ret, buf_size; |
ca95a216 | 722 | |
f3ed775e | 723 | buf_size = size; |
5461b305 | 724 | |
ba7f0ae5 | 725 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 726 | if (cmd_ctx->llm == NULL) { |
76d7553f | 727 | PERROR("zmalloc"); |
5461b305 | 728 | ret = -ENOMEM; |
ca95a216 DG |
729 | goto error; |
730 | } | |
731 | ||
5461b305 DG |
732 | /* Copy common data */ |
733 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 734 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 735 | |
5461b305 DG |
736 | cmd_ctx->llm->data_size = size; |
737 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
738 | ||
ca95a216 DG |
739 | return buf_size; |
740 | ||
741 | error: | |
742 | return ret; | |
743 | } | |
744 | ||
7a485870 | 745 | /* |
5eb91c98 | 746 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 747 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 748 | */ |
5eb91c98 | 749 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 750 | { |
5eb91c98 | 751 | int ret; |
7a485870 DG |
752 | struct ltt_session *session; |
753 | struct ltt_kernel_channel *channel; | |
754 | ||
5eb91c98 | 755 | DBG("Updating kernel poll set"); |
7a485870 | 756 | |
54d01ffb | 757 | session_lock_list(); |
b5541356 | 758 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 759 | session_lock(session); |
7a485870 | 760 | if (session->kernel_session == NULL) { |
54d01ffb | 761 | session_unlock(session); |
7a485870 DG |
762 | continue; |
763 | } | |
7a485870 | 764 | |
54d01ffb DG |
765 | cds_list_for_each_entry(channel, |
766 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
767 | /* Add channel fd to the kernel poll set */ |
768 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
769 | if (ret < 0) { | |
54d01ffb | 770 | session_unlock(session); |
5eb91c98 DG |
771 | goto error; |
772 | } | |
773 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 774 | } |
54d01ffb | 775 | session_unlock(session); |
7a485870 | 776 | } |
54d01ffb | 777 | session_unlock_list(); |
7a485870 | 778 | |
5eb91c98 | 779 | return 0; |
7a485870 DG |
780 | |
781 | error: | |
54d01ffb | 782 | session_unlock_list(); |
7a485870 DG |
783 | return -1; |
784 | } | |
785 | ||
786 | /* | |
54d01ffb | 787 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 788 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 789 | * |
d063d709 | 790 | * Useful for CPU hotplug feature. |
7a485870 | 791 | */ |
2bdd86d4 | 792 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
793 | { |
794 | int ret = 0; | |
795 | struct ltt_session *session; | |
173af62f | 796 | struct ltt_kernel_session *ksess; |
7a485870 DG |
797 | struct ltt_kernel_channel *channel; |
798 | ||
799 | DBG("Updating kernel streams for channel fd %d", fd); | |
800 | ||
54d01ffb | 801 | session_lock_list(); |
b5541356 | 802 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 803 | session_lock(session); |
7a485870 | 804 | if (session->kernel_session == NULL) { |
54d01ffb | 805 | session_unlock(session); |
7a485870 DG |
806 | continue; |
807 | } | |
173af62f | 808 | ksess = session->kernel_session; |
d9800920 | 809 | |
173af62f | 810 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
811 | if (channel->fd == fd) { |
812 | DBG("Channel found, updating kernel streams"); | |
813 | ret = kernel_open_channel_stream(channel); | |
814 | if (ret < 0) { | |
b3c750d2 | 815 | goto error; |
7a485870 | 816 | } |
5c786ded JD |
817 | /* Update the stream global counter */ |
818 | ksess->stream_count_global += ret; | |
d9800920 | 819 | |
7a485870 | 820 | /* |
5eb91c98 DG |
821 | * Have we already sent fds to the consumer? If yes, it means |
822 | * that tracing is started so it is safe to send our updated | |
823 | * stream fds. | |
7a485870 | 824 | */ |
173af62f DG |
825 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
826 | struct lttng_ht_iter iter; | |
827 | struct consumer_socket *socket; | |
828 | ||
e7fe706f | 829 | rcu_read_lock(); |
173af62f DG |
830 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
831 | &iter.iter, socket, node.node) { | |
173af62f | 832 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 833 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
834 | channel, ksess, |
835 | session->output_traces ? 1 : 0); | |
173af62f DG |
836 | pthread_mutex_unlock(socket->lock); |
837 | if (ret < 0) { | |
e7fe706f | 838 | rcu_read_unlock(); |
173af62f DG |
839 | goto error; |
840 | } | |
7a485870 | 841 | } |
e7fe706f | 842 | rcu_read_unlock(); |
7a485870 | 843 | } |
b3c750d2 | 844 | goto error; |
7a485870 DG |
845 | } |
846 | } | |
54d01ffb | 847 | session_unlock(session); |
7a485870 | 848 | } |
54d01ffb | 849 | session_unlock_list(); |
b3c750d2 | 850 | return ret; |
7a485870 | 851 | |
b3c750d2 | 852 | error: |
54d01ffb DG |
853 | session_unlock(session); |
854 | session_unlock_list(); | |
7a485870 DG |
855 | return ret; |
856 | } | |
857 | ||
487cf67c | 858 | /* |
ffe60014 DG |
859 | * For each tracing session, update newly registered apps. The session list |
860 | * lock MUST be acquired before calling this. | |
487cf67c DG |
861 | */ |
862 | static void update_ust_app(int app_sock) | |
863 | { | |
864 | struct ltt_session *sess, *stmp; | |
865 | ||
fdadac08 DG |
866 | /* Consumer is in an ERROR state. Stop any application update. */ |
867 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
868 | /* Stop the update process since the consumer is dead. */ | |
869 | return; | |
870 | } | |
871 | ||
487cf67c DG |
872 | /* For all tracing session(s) */ |
873 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 874 | session_lock(sess); |
421cb601 DG |
875 | if (sess->ust_session) { |
876 | ust_app_global_update(sess->ust_session, app_sock); | |
877 | } | |
4ee14516 | 878 | session_unlock(sess); |
487cf67c DG |
879 | } |
880 | } | |
881 | ||
7a485870 | 882 | /* |
d063d709 | 883 | * This thread manage event coming from the kernel. |
7a485870 | 884 | * |
d063d709 DG |
885 | * Features supported in this thread: |
886 | * -) CPU Hotplug | |
7a485870 DG |
887 | */ |
888 | static void *thread_manage_kernel(void *data) | |
889 | { | |
139ac872 | 890 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 891 | uint32_t revents, nb_fd; |
7a485870 | 892 | char tmp; |
5eb91c98 | 893 | struct lttng_poll_event events; |
7a485870 | 894 | |
6993eeb3 | 895 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 896 | |
6c71277b | 897 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 898 | |
d5d63bf1 DG |
899 | /* |
900 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 901 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 902 | */ |
6d737ce4 | 903 | lttng_poll_init(&events); |
d5d63bf1 | 904 | |
e547b070 | 905 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
906 | goto error_testpoint; |
907 | } | |
8ac94142 | 908 | |
840cb59c | 909 | health_code_update(); |
44a5e5eb | 910 | |
e547b070 | 911 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 912 | goto error_testpoint; |
6993eeb3 CB |
913 | } |
914 | ||
7a485870 | 915 | while (1) { |
840cb59c | 916 | health_code_update(); |
44a5e5eb | 917 | |
7a485870 | 918 | if (update_poll_flag == 1) { |
d21b0d71 DG |
919 | /* Clean events object. We are about to populate it again. */ |
920 | lttng_poll_clean(&events); | |
921 | ||
d0b96690 | 922 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
923 | if (ret < 0) { |
924 | goto error_poll_create; | |
925 | } | |
926 | ||
927 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
928 | if (ret < 0) { | |
929 | goto error; | |
930 | } | |
5f822d0a | 931 | |
d21b0d71 | 932 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
933 | ret = update_kernel_poll(&events); |
934 | if (ret < 0) { | |
7a485870 DG |
935 | goto error; |
936 | } | |
937 | update_poll_flag = 0; | |
938 | } | |
939 | ||
d21b0d71 | 940 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
941 | |
942 | /* Poll infinite value of time */ | |
88f2b785 | 943 | restart: |
a78af745 | 944 | health_poll_entry(); |
5eb91c98 | 945 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 946 | health_poll_exit(); |
7a485870 | 947 | if (ret < 0) { |
88f2b785 MD |
948 | /* |
949 | * Restart interrupted system call. | |
950 | */ | |
951 | if (errno == EINTR) { | |
952 | goto restart; | |
953 | } | |
7a485870 DG |
954 | goto error; |
955 | } else if (ret == 0) { | |
956 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
957 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
958 | "This should not have happened! Continuing..."); | |
7a485870 DG |
959 | continue; |
960 | } | |
961 | ||
0d9c5d77 DG |
962 | nb_fd = ret; |
963 | ||
5eb91c98 DG |
964 | for (i = 0; i < nb_fd; i++) { |
965 | /* Fetch once the poll data */ | |
966 | revents = LTTNG_POLL_GETEV(&events, i); | |
967 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 968 | |
840cb59c | 969 | health_code_update(); |
44a5e5eb | 970 | |
5eb91c98 | 971 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 972 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 973 | if (ret) { |
139ac872 MD |
974 | err = 0; |
975 | goto exit; | |
5eb91c98 | 976 | } |
7a485870 | 977 | |
5eb91c98 DG |
978 | /* Check for data on kernel pipe */ |
979 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
6cd525e8 MD |
980 | (void) lttng_read(kernel_poll_pipe[0], |
981 | &tmp, 1); | |
f921c78f DG |
982 | /* |
983 | * Ret value is useless here, if this pipe gets any actions an | |
984 | * update is required anyway. | |
985 | */ | |
5eb91c98 DG |
986 | update_poll_flag = 1; |
987 | continue; | |
988 | } else { | |
989 | /* | |
990 | * New CPU detected by the kernel. Adding kernel stream to | |
991 | * kernel session and updating the kernel consumer | |
992 | */ | |
993 | if (revents & LPOLLIN) { | |
2bdd86d4 | 994 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
995 | if (ret < 0) { |
996 | continue; | |
997 | } | |
998 | break; | |
999 | /* | |
1000 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
1001 | * and unregister kernel stream at this point. | |
1002 | */ | |
7a485870 | 1003 | } |
7a485870 DG |
1004 | } |
1005 | } | |
1006 | } | |
1007 | ||
139ac872 | 1008 | exit: |
7a485870 | 1009 | error: |
5eb91c98 | 1010 | lttng_poll_clean(&events); |
76d7553f | 1011 | error_poll_create: |
6993eeb3 | 1012 | error_testpoint: |
6620da75 DG |
1013 | utils_close_pipe(kernel_poll_pipe); |
1014 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1015 | if (err) { |
840cb59c | 1016 | health_error(); |
139ac872 | 1017 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1018 | WARN("Kernel thread died unexpectedly. " |
1019 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1020 | } |
8782cc74 | 1021 | health_unregister(health_sessiond); |
76d7553f | 1022 | DBG("Kernel thread dying"); |
7a485870 DG |
1023 | return NULL; |
1024 | } | |
1025 | ||
a23ec3a7 DG |
1026 | /* |
1027 | * Signal pthread condition of the consumer data that the thread. | |
1028 | */ | |
1029 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1030 | { | |
1031 | pthread_mutex_lock(&data->cond_mutex); | |
1032 | ||
1033 | /* | |
1034 | * The state is set before signaling. It can be any value, it's the waiter | |
1035 | * job to correctly interpret this condition variable associated to the | |
1036 | * consumer pthread_cond. | |
1037 | * | |
1038 | * A value of 0 means that the corresponding thread of the consumer data | |
1039 | * was not started. 1 indicates that the thread has started and is ready | |
1040 | * for action. A negative value means that there was an error during the | |
1041 | * thread bootstrap. | |
1042 | */ | |
1043 | data->consumer_thread_is_ready = state; | |
1044 | (void) pthread_cond_signal(&data->cond); | |
1045 | ||
1046 | pthread_mutex_unlock(&data->cond_mutex); | |
1047 | } | |
1048 | ||
1d4b027a | 1049 | /* |
3bd1e081 | 1050 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1051 | */ |
3bd1e081 | 1052 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1053 | { |
139ac872 | 1054 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 1055 | uint32_t revents, nb_fd; |
1d4b027a | 1056 | enum lttcomm_return_code code; |
5eb91c98 | 1057 | struct lttng_poll_event events; |
3bd1e081 | 1058 | struct consumer_data *consumer_data = data; |
1d4b027a | 1059 | |
3bd1e081 | 1060 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1061 | |
6c71277b | 1062 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1063 | |
855060f8 | 1064 | health_code_update(); |
9449cc75 | 1065 | |
5eb91c98 | 1066 | /* |
331744e3 JD |
1067 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1068 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1069 | */ |
331744e3 | 1070 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1071 | if (ret < 0) { |
76d7553f | 1072 | goto error_poll; |
5eb91c98 | 1073 | } |
273ea72c | 1074 | |
edb8b045 DG |
1075 | /* |
1076 | * The error socket here is already in a listening state which was done | |
1077 | * just before spawning this thread to avoid a race between the consumer | |
1078 | * daemon exec trying to connect and the listen() call. | |
1079 | */ | |
3bd1e081 | 1080 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1081 | if (ret < 0) { |
1082 | goto error; | |
1083 | } | |
1084 | ||
840cb59c | 1085 | health_code_update(); |
44a5e5eb | 1086 | |
331744e3 | 1087 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1088 | restart: |
a78af745 | 1089 | health_poll_entry(); |
8ac94142 | 1090 | |
e547b070 | 1091 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1092 | goto error; |
1093 | } | |
8ac94142 | 1094 | |
5eb91c98 | 1095 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1096 | health_poll_exit(); |
273ea72c | 1097 | if (ret < 0) { |
88f2b785 MD |
1098 | /* |
1099 | * Restart interrupted system call. | |
1100 | */ | |
1101 | if (errno == EINTR) { | |
1102 | goto restart; | |
1103 | } | |
273ea72c DG |
1104 | goto error; |
1105 | } | |
1106 | ||
0d9c5d77 DG |
1107 | nb_fd = ret; |
1108 | ||
5eb91c98 DG |
1109 | for (i = 0; i < nb_fd; i++) { |
1110 | /* Fetch once the poll data */ | |
1111 | revents = LTTNG_POLL_GETEV(&events, i); | |
1112 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1113 | ||
840cb59c | 1114 | health_code_update(); |
44a5e5eb | 1115 | |
5eb91c98 | 1116 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1117 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1118 | if (ret) { |
139ac872 MD |
1119 | err = 0; |
1120 | goto exit; | |
5eb91c98 DG |
1121 | } |
1122 | ||
1123 | /* Event on the registration socket */ | |
3bd1e081 | 1124 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1125 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1126 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1127 | goto error; |
1128 | } | |
1129 | } | |
273ea72c DG |
1130 | } |
1131 | ||
3bd1e081 | 1132 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1133 | if (sock < 0) { |
1134 | goto error; | |
1135 | } | |
1136 | ||
b662582b DG |
1137 | /* |
1138 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1139 | * show must go on. | |
1140 | */ | |
1141 | (void) utils_set_fd_cloexec(sock); | |
1142 | ||
840cb59c | 1143 | health_code_update(); |
44a5e5eb | 1144 | |
3bd1e081 | 1145 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1146 | |
712ea556 | 1147 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1148 | ret = lttcomm_recv_unix_sock(sock, &code, |
1149 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1150 | if (ret <= 0) { |
1151 | goto error; | |
1152 | } | |
1153 | ||
840cb59c | 1154 | health_code_update(); |
f73fabfd | 1155 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1156 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1157 | consumer_data->cmd_sock = |
1158 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1159 | consumer_data->metadata_fd = |
331744e3 | 1160 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1161 | if (consumer_data->cmd_sock < 0 |
1162 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1163 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1164 | /* On error, signal condition and quit. */ |
1165 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1166 | goto error; |
1167 | } | |
9363801e | 1168 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1169 | /* Create metadata socket lock. */ |
1170 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1171 | if (consumer_data->metadata_sock.lock == NULL) { | |
1172 | PERROR("zmalloc pthread mutex"); | |
1173 | ret = -1; | |
1174 | goto error; | |
1175 | } | |
1176 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1177 | ||
a23ec3a7 | 1178 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1179 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1180 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1181 | consumer_data->metadata_fd); |
1d4b027a | 1182 | } else { |
3bd1e081 | 1183 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1184 | lttcomm_get_readable_code(-code)); |
1185 | goto error; | |
1186 | } | |
1187 | ||
331744e3 | 1188 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1189 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1190 | if (ret < 0) { |
72079cae DG |
1191 | goto error; |
1192 | } | |
1193 | ||
331744e3 | 1194 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1195 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1196 | if (ret < 0) { | |
72079cae | 1197 | goto error; |
5eb91c98 DG |
1198 | } |
1199 | ||
331744e3 | 1200 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1201 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1202 | LPOLLIN | LPOLLRDHUP); |
1203 | if (ret < 0) { | |
1204 | goto error; | |
1205 | } | |
1206 | ||
840cb59c | 1207 | health_code_update(); |
44a5e5eb | 1208 | |
331744e3 | 1209 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1210 | restart_poll: |
331744e3 JD |
1211 | while (1) { |
1212 | health_poll_entry(); | |
1213 | ret = lttng_poll_wait(&events, -1); | |
1214 | health_poll_exit(); | |
1215 | if (ret < 0) { | |
1216 | /* | |
1217 | * Restart interrupted system call. | |
1218 | */ | |
1219 | if (errno == EINTR) { | |
1220 | goto restart_poll; | |
1221 | } | |
1222 | goto error; | |
88f2b785 | 1223 | } |
72079cae | 1224 | |
331744e3 | 1225 | nb_fd = ret; |
0d9c5d77 | 1226 | |
331744e3 JD |
1227 | for (i = 0; i < nb_fd; i++) { |
1228 | /* Fetch once the poll data */ | |
1229 | revents = LTTNG_POLL_GETEV(&events, i); | |
1230 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1231 | |
331744e3 | 1232 | health_code_update(); |
44a5e5eb | 1233 | |
331744e3 JD |
1234 | /* Thread quit pipe has been closed. Killing thread. */ |
1235 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1236 | if (ret) { | |
1237 | err = 0; | |
1238 | goto exit; | |
1239 | } | |
5eb91c98 | 1240 | |
331744e3 JD |
1241 | if (pollfd == sock) { |
1242 | /* Event on the consumerd socket */ | |
1243 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1244 | ERR("consumer err socket second poll error"); | |
1245 | goto error; | |
1246 | } | |
1247 | health_code_update(); | |
1248 | /* Wait for any kconsumerd error */ | |
1249 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1250 | sizeof(enum lttcomm_return_code)); | |
1251 | if (ret <= 0) { | |
1252 | ERR("consumer closed the command socket"); | |
1253 | goto error; | |
1254 | } | |
1255 | ||
1256 | ERR("consumer return code : %s", | |
1257 | lttcomm_get_readable_code(-code)); | |
1258 | ||
1259 | goto exit; | |
4ce514c4 | 1260 | } else if (pollfd == consumer_data->metadata_fd) { |
331744e3 JD |
1261 | /* UST metadata requests */ |
1262 | ret = ust_consumer_metadata_request( | |
1263 | &consumer_data->metadata_sock); | |
1264 | if (ret < 0) { | |
1265 | ERR("Handling metadata request"); | |
1266 | goto error; | |
1267 | } | |
1268 | break; | |
1269 | } else { | |
1270 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1271 | goto error; |
1272 | } | |
1273 | } | |
331744e3 | 1274 | health_code_update(); |
5eb91c98 DG |
1275 | } |
1276 | ||
139ac872 | 1277 | exit: |
1d4b027a | 1278 | error: |
fdadac08 DG |
1279 | /* |
1280 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1281 | * thread might be using them so get exclusive access which will abort all |
1282 | * other consumer command by other threads. | |
fdadac08 DG |
1283 | */ |
1284 | pthread_mutex_lock(&consumer_data->lock); | |
1285 | ||
5c827ce0 DG |
1286 | /* Immediately set the consumerd state to stopped */ |
1287 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1288 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1289 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1290 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1291 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1292 | } else { | |
1293 | /* Code flow error... */ | |
1294 | assert(0); | |
1295 | } | |
1296 | ||
76d7553f MD |
1297 | if (consumer_data->err_sock >= 0) { |
1298 | ret = close(consumer_data->err_sock); | |
1299 | if (ret) { | |
1300 | PERROR("close"); | |
1301 | } | |
a76cbd9f | 1302 | consumer_data->err_sock = -1; |
76d7553f MD |
1303 | } |
1304 | if (consumer_data->cmd_sock >= 0) { | |
1305 | ret = close(consumer_data->cmd_sock); | |
1306 | if (ret) { | |
1307 | PERROR("close"); | |
1308 | } | |
a76cbd9f | 1309 | consumer_data->cmd_sock = -1; |
76d7553f | 1310 | } |
96544455 SS |
1311 | if (consumer_data->metadata_sock.fd_ptr && |
1312 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1313 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1314 | if (ret) { |
1315 | PERROR("close"); | |
1316 | } | |
1317 | } | |
76d7553f MD |
1318 | if (sock >= 0) { |
1319 | ret = close(sock); | |
1320 | if (ret) { | |
1321 | PERROR("close"); | |
1322 | } | |
1323 | } | |
273ea72c | 1324 | |
3bd1e081 MD |
1325 | unlink(consumer_data->err_unix_sock_path); |
1326 | unlink(consumer_data->cmd_unix_sock_path); | |
1327 | consumer_data->pid = 0; | |
fdadac08 | 1328 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1329 | |
fdadac08 | 1330 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1331 | if (consumer_data->metadata_sock.lock) { |
1332 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1333 | free(consumer_data->metadata_sock.lock); | |
1334 | } | |
5eb91c98 | 1335 | lttng_poll_clean(&events); |
76d7553f | 1336 | error_poll: |
139ac872 | 1337 | if (err) { |
840cb59c | 1338 | health_error(); |
139ac872 MD |
1339 | ERR("Health error occurred in %s", __func__); |
1340 | } | |
8782cc74 | 1341 | health_unregister(health_sessiond); |
76d7553f | 1342 | DBG("consumer thread cleanup completed"); |
0177d773 | 1343 | |
5eb91c98 | 1344 | return NULL; |
099e26bd DG |
1345 | } |
1346 | ||
099e26bd DG |
1347 | /* |
1348 | * This thread manage application communication. | |
1d4b027a DG |
1349 | */ |
1350 | static void *thread_manage_apps(void *data) | |
099e26bd | 1351 | { |
139ac872 | 1352 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1353 | ssize_t size_ret; |
5eb91c98 | 1354 | uint32_t revents, nb_fd; |
5eb91c98 | 1355 | struct lttng_poll_event events; |
099e26bd DG |
1356 | |
1357 | DBG("[thread] Manage application started"); | |
1358 | ||
f6a9efaa DG |
1359 | rcu_register_thread(); |
1360 | rcu_thread_online(); | |
1361 | ||
6c71277b | 1362 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1363 | |
e547b070 | 1364 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1365 | goto error_testpoint; |
1366 | } | |
1367 | ||
840cb59c | 1368 | health_code_update(); |
44a5e5eb | 1369 | |
d0b96690 | 1370 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1371 | if (ret < 0) { |
76d7553f | 1372 | goto error_poll_create; |
5eb91c98 | 1373 | } |
099e26bd | 1374 | |
5eb91c98 DG |
1375 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1376 | if (ret < 0) { | |
1377 | goto error; | |
1378 | } | |
099e26bd | 1379 | |
e547b070 | 1380 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1381 | goto error; |
1382 | } | |
8ac94142 | 1383 | |
840cb59c | 1384 | health_code_update(); |
44a5e5eb | 1385 | |
5eb91c98 | 1386 | while (1) { |
d21b0d71 | 1387 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1388 | |
1389 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1390 | restart: |
a78af745 | 1391 | health_poll_entry(); |
5eb91c98 | 1392 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1393 | health_poll_exit(); |
099e26bd | 1394 | if (ret < 0) { |
88f2b785 MD |
1395 | /* |
1396 | * Restart interrupted system call. | |
1397 | */ | |
1398 | if (errno == EINTR) { | |
1399 | goto restart; | |
1400 | } | |
099e26bd DG |
1401 | goto error; |
1402 | } | |
1403 | ||
0d9c5d77 DG |
1404 | nb_fd = ret; |
1405 | ||
5eb91c98 DG |
1406 | for (i = 0; i < nb_fd; i++) { |
1407 | /* Fetch once the poll data */ | |
1408 | revents = LTTNG_POLL_GETEV(&events, i); | |
1409 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1410 | ||
840cb59c | 1411 | health_code_update(); |
44a5e5eb | 1412 | |
5eb91c98 | 1413 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1414 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1415 | if (ret) { |
139ac872 MD |
1416 | err = 0; |
1417 | goto exit; | |
5eb91c98 | 1418 | } |
099e26bd | 1419 | |
5eb91c98 DG |
1420 | /* Inspect the apps cmd pipe */ |
1421 | if (pollfd == apps_cmd_pipe[0]) { | |
1422 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1423 | ERR("Apps command pipe error"); | |
0177d773 | 1424 | goto error; |
5eb91c98 | 1425 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1426 | int sock; |
1427 | ||
5eb91c98 | 1428 | /* Empty pipe */ |
6cd525e8 MD |
1429 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1430 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1431 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1432 | goto error; |
1433 | } | |
099e26bd | 1434 | |
840cb59c | 1435 | health_code_update(); |
44a5e5eb | 1436 | |
ffe60014 | 1437 | /* |
d0b96690 DG |
1438 | * We only monitor the error events of the socket. This |
1439 | * thread does not handle any incoming data from UST | |
1440 | * (POLLIN). | |
ffe60014 | 1441 | */ |
d0b96690 DG |
1442 | ret = lttng_poll_add(&events, sock, |
1443 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1444 | if (ret < 0) { | |
5eb91c98 | 1445 | goto error; |
e0c7ec2b | 1446 | } |
acc7b41b | 1447 | |
d0b96690 | 1448 | DBG("Apps with sock %d added to poll set", sock); |
0177d773 | 1449 | } |
5eb91c98 DG |
1450 | } else { |
1451 | /* | |
54d01ffb DG |
1452 | * At this point, we know that a registered application made |
1453 | * the event at poll_wait. | |
5eb91c98 DG |
1454 | */ |
1455 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1456 | /* Removing from the poll set */ | |
1457 | ret = lttng_poll_del(&events, pollfd); | |
1458 | if (ret < 0) { | |
1459 | goto error; | |
1460 | } | |
099e26bd | 1461 | |
b9d9b220 | 1462 | /* Socket closed on remote end. */ |
56fff090 | 1463 | ust_app_unregister(pollfd); |
5eb91c98 | 1464 | } |
099e26bd | 1465 | } |
44a5e5eb | 1466 | |
840cb59c | 1467 | health_code_update(); |
099e26bd | 1468 | } |
099e26bd DG |
1469 | } |
1470 | ||
139ac872 | 1471 | exit: |
099e26bd | 1472 | error: |
5eb91c98 | 1473 | lttng_poll_clean(&events); |
76d7553f | 1474 | error_poll_create: |
6993eeb3 | 1475 | error_testpoint: |
6620da75 DG |
1476 | utils_close_pipe(apps_cmd_pipe); |
1477 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1478 | ||
1479 | /* | |
1480 | * We don't clean the UST app hash table here since already registered | |
1481 | * applications can still be controlled so let them be until the session | |
1482 | * daemon dies or the applications stop. | |
1483 | */ | |
1484 | ||
139ac872 | 1485 | if (err) { |
840cb59c | 1486 | health_error(); |
139ac872 MD |
1487 | ERR("Health error occurred in %s", __func__); |
1488 | } | |
8782cc74 | 1489 | health_unregister(health_sessiond); |
76d7553f | 1490 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1491 | rcu_thread_offline(); |
1492 | rcu_unregister_thread(); | |
099e26bd DG |
1493 | return NULL; |
1494 | } | |
1495 | ||
d0b96690 | 1496 | /* |
d88aee68 DG |
1497 | * Send a socket to a thread This is called from the dispatch UST registration |
1498 | * thread once all sockets are set for the application. | |
d0b96690 | 1499 | * |
b85dc84c DG |
1500 | * The sock value can be invalid, we don't really care, the thread will handle |
1501 | * it and make the necessary cleanup if so. | |
1502 | * | |
d0b96690 DG |
1503 | * On success, return 0 else a negative value being the errno message of the |
1504 | * write(). | |
1505 | */ | |
d88aee68 | 1506 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1507 | { |
6cd525e8 | 1508 | ssize_t ret; |
d0b96690 | 1509 | |
b85dc84c DG |
1510 | /* |
1511 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1512 | * before calling this function being a shutdown state of the thread. | |
1513 | */ | |
1514 | if (fd < 0) { | |
1515 | ret = -EBADF; | |
1516 | goto error; | |
1517 | } | |
d0b96690 | 1518 | |
6cd525e8 MD |
1519 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1520 | if (ret < sizeof(sock)) { | |
d88aee68 | 1521 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1522 | if (ret < 0) { |
1523 | ret = -errno; | |
1524 | } | |
1525 | goto error; | |
1526 | } | |
1527 | ||
1528 | /* All good. Don't send back the write positive ret value. */ | |
1529 | ret = 0; | |
1530 | error: | |
6cd525e8 | 1531 | return (int) ret; |
d0b96690 DG |
1532 | } |
1533 | ||
f45e313d DG |
1534 | /* |
1535 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1536 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1537 | * notify socket is never received. | |
1538 | */ | |
1539 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1540 | { | |
1541 | int ret, nb_fd = 0, i; | |
1542 | unsigned int fd_added = 0; | |
1543 | struct lttng_poll_event events; | |
1544 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1545 | ||
1546 | assert(wait_queue); | |
1547 | ||
1548 | lttng_poll_init(&events); | |
1549 | ||
1550 | /* Just skip everything for an empty queue. */ | |
1551 | if (!wait_queue->count) { | |
1552 | goto end; | |
1553 | } | |
1554 | ||
1555 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1556 | if (ret < 0) { | |
1557 | goto error_create; | |
1558 | } | |
1559 | ||
1560 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1561 | &wait_queue->head, head) { | |
1562 | assert(wait_node->app); | |
1563 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1564 | LPOLLHUP | LPOLLERR); | |
1565 | if (ret < 0) { | |
1566 | goto error; | |
1567 | } | |
1568 | ||
1569 | fd_added = 1; | |
1570 | } | |
1571 | ||
1572 | if (!fd_added) { | |
1573 | goto end; | |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * Poll but don't block so we can quickly identify the faulty events and | |
1578 | * clean them afterwards from the wait queue. | |
1579 | */ | |
1580 | ret = lttng_poll_wait(&events, 0); | |
1581 | if (ret < 0) { | |
1582 | goto error; | |
1583 | } | |
1584 | nb_fd = ret; | |
1585 | ||
1586 | for (i = 0; i < nb_fd; i++) { | |
1587 | /* Get faulty FD. */ | |
1588 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1589 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1590 | ||
1591 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1592 | &wait_queue->head, head) { | |
1593 | if (pollfd == wait_node->app->sock && | |
1594 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1595 | cds_list_del(&wait_node->head); | |
1596 | wait_queue->count--; | |
1597 | ust_app_destroy(wait_node->app); | |
1598 | free(wait_node); | |
1599 | break; | |
1600 | } | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | if (nb_fd > 0) { | |
1605 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1606 | } | |
1607 | ||
1608 | end: | |
1609 | lttng_poll_clean(&events); | |
1610 | return; | |
1611 | ||
1612 | error: | |
1613 | lttng_poll_clean(&events); | |
1614 | error_create: | |
1615 | ERR("Unable to sanitize wait queue"); | |
1616 | return; | |
1617 | } | |
1618 | ||
099e26bd DG |
1619 | /* |
1620 | * Dispatch request from the registration threads to the application | |
1621 | * communication thread. | |
1622 | */ | |
1623 | static void *thread_dispatch_ust_registration(void *data) | |
1624 | { | |
12e2b881 | 1625 | int ret, err = -1; |
099e26bd DG |
1626 | struct cds_wfq_node *node; |
1627 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1628 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1629 | struct ust_reg_wait_queue wait_queue = { | |
1630 | .count = 0, | |
1631 | }; | |
d0b96690 | 1632 | |
6c71277b | 1633 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1634 | |
9ad42ec1 MD |
1635 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1636 | goto error_testpoint; | |
1637 | } | |
1638 | ||
12e2b881 MD |
1639 | health_code_update(); |
1640 | ||
f45e313d | 1641 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1642 | |
1643 | DBG("[thread] Dispatch UST command started"); | |
1644 | ||
26c9d55e | 1645 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1646 | health_code_update(); |
1647 | ||
099e26bd DG |
1648 | /* Atomically prepare the queue futex */ |
1649 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1650 | ||
1651 | do { | |
d0b96690 | 1652 | struct ust_app *app = NULL; |
7972aab2 | 1653 | ust_cmd = NULL; |
d0b96690 | 1654 | |
f45e313d DG |
1655 | /* |
1656 | * Make sure we don't have node(s) that have hung up before receiving | |
1657 | * the notify socket. This is to clean the list in order to avoid | |
1658 | * memory leaks from notify socket that are never seen. | |
1659 | */ | |
1660 | sanitize_wait_queue(&wait_queue); | |
1661 | ||
12e2b881 | 1662 | health_code_update(); |
099e26bd DG |
1663 | /* Dequeue command for registration */ |
1664 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1665 | if (node == NULL) { | |
00a17c97 | 1666 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1667 | /* Continue thread execution */ |
1668 | break; | |
1669 | } | |
1670 | ||
1671 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1672 | ||
2f50c8a3 DG |
1673 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1674 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1675 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1676 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1677 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1678 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1679 | |
1680 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1681 | wait_node = zmalloc(sizeof(*wait_node)); | |
1682 | if (!wait_node) { | |
1683 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1684 | ret = close(ust_cmd->sock); |
1685 | if (ret < 0) { | |
1686 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1687 | } | |
51dec90d | 1688 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1689 | free(ust_cmd); |
d0b96690 DG |
1690 | goto error; |
1691 | } | |
1692 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1693 | ||
1694 | /* Create application object if socket is CMD. */ | |
1695 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1696 | ust_cmd->sock); | |
1697 | if (!wait_node->app) { | |
1698 | ret = close(ust_cmd->sock); | |
1699 | if (ret < 0) { | |
1700 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1701 | } |
51dec90d | 1702 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1703 | free(wait_node); |
7972aab2 | 1704 | free(ust_cmd); |
d0b96690 DG |
1705 | continue; |
1706 | } | |
1707 | /* | |
1708 | * Add application to the wait queue so we can set the notify | |
1709 | * socket before putting this object in the global ht. | |
1710 | */ | |
f45e313d DG |
1711 | cds_list_add(&wait_node->head, &wait_queue.head); |
1712 | wait_queue.count++; | |
d0b96690 | 1713 | |
7972aab2 | 1714 | free(ust_cmd); |
d0b96690 DG |
1715 | /* |
1716 | * We have to continue here since we don't have the notify | |
1717 | * socket and the application MUST be added to the hash table | |
1718 | * only at that moment. | |
1719 | */ | |
1720 | continue; | |
1721 | } else { | |
1722 | /* | |
1723 | * Look for the application in the local wait queue and set the | |
1724 | * notify socket if found. | |
1725 | */ | |
d88aee68 | 1726 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1727 | &wait_queue.head, head) { |
12e2b881 | 1728 | health_code_update(); |
d0b96690 DG |
1729 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1730 | wait_node->app->notify_sock = ust_cmd->sock; | |
1731 | cds_list_del(&wait_node->head); | |
f45e313d | 1732 | wait_queue.count--; |
d0b96690 DG |
1733 | app = wait_node->app; |
1734 | free(wait_node); | |
1735 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1736 | break; | |
1737 | } | |
1738 | } | |
020d7f60 DG |
1739 | |
1740 | /* | |
1741 | * With no application at this stage the received socket is | |
1742 | * basically useless so close it before we free the cmd data | |
1743 | * structure for good. | |
1744 | */ | |
1745 | if (!app) { | |
1746 | ret = close(ust_cmd->sock); | |
1747 | if (ret < 0) { | |
1748 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1749 | } | |
51dec90d | 1750 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1751 | } |
7972aab2 | 1752 | free(ust_cmd); |
d0b96690 DG |
1753 | } |
1754 | ||
1755 | if (app) { | |
d0b96690 DG |
1756 | /* |
1757 | * @session_lock_list | |
1758 | * | |
1759 | * Lock the global session list so from the register up to the | |
1760 | * registration done message, no thread can see the application | |
1761 | * and change its state. | |
1762 | */ | |
1763 | session_lock_list(); | |
1764 | rcu_read_lock(); | |
d88aee68 | 1765 | |
d0b96690 DG |
1766 | /* |
1767 | * Add application to the global hash table. This needs to be | |
1768 | * done before the update to the UST registry can locate the | |
1769 | * application. | |
1770 | */ | |
1771 | ust_app_add(app); | |
d88aee68 DG |
1772 | |
1773 | /* Set app version. This call will print an error if needed. */ | |
1774 | (void) ust_app_version(app); | |
1775 | ||
1776 | /* Send notify socket through the notify pipe. */ | |
1777 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1778 | app->notify_sock); | |
1779 | if (ret < 0) { | |
1780 | rcu_read_unlock(); | |
1781 | session_unlock_list(); | |
b85dc84c DG |
1782 | /* |
1783 | * No notify thread, stop the UST tracing. However, this is | |
1784 | * not an internal error of the this thread thus setting | |
1785 | * the health error code to a normal exit. | |
1786 | */ | |
1787 | err = 0; | |
d88aee68 | 1788 | goto error; |
6620da75 | 1789 | } |
d88aee68 | 1790 | |
d0b96690 DG |
1791 | /* |
1792 | * Update newly registered application with the tracing | |
1793 | * registry info already enabled information. | |
1794 | */ | |
1795 | update_ust_app(app->sock); | |
d88aee68 DG |
1796 | |
1797 | /* | |
1798 | * Don't care about return value. Let the manage apps threads | |
1799 | * handle app unregistration upon socket close. | |
1800 | */ | |
1801 | (void) ust_app_register_done(app->sock); | |
1802 | ||
1803 | /* | |
1804 | * Even if the application socket has been closed, send the app | |
1805 | * to the thread and unregistration will take place at that | |
1806 | * place. | |
1807 | */ | |
1808 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1809 | if (ret < 0) { |
d88aee68 DG |
1810 | rcu_read_unlock(); |
1811 | session_unlock_list(); | |
b85dc84c DG |
1812 | /* |
1813 | * No apps. thread, stop the UST tracing. However, this is | |
1814 | * not an internal error of the this thread thus setting | |
1815 | * the health error code to a normal exit. | |
1816 | */ | |
1817 | err = 0; | |
d88aee68 | 1818 | goto error; |
d0b96690 | 1819 | } |
d88aee68 | 1820 | |
d0b96690 DG |
1821 | rcu_read_unlock(); |
1822 | session_unlock_list(); | |
099e26bd | 1823 | } |
099e26bd DG |
1824 | } while (node != NULL); |
1825 | ||
12e2b881 | 1826 | health_poll_entry(); |
099e26bd DG |
1827 | /* Futex wait on queue. Blocking call on futex() */ |
1828 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1829 | health_poll_exit(); |
099e26bd | 1830 | } |
12e2b881 MD |
1831 | /* Normal exit, no error */ |
1832 | err = 0; | |
099e26bd DG |
1833 | |
1834 | error: | |
d88aee68 DG |
1835 | /* Clean up wait queue. */ |
1836 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1837 | &wait_queue.head, head) { |
d88aee68 | 1838 | cds_list_del(&wait_node->head); |
f45e313d | 1839 | wait_queue.count--; |
d88aee68 DG |
1840 | free(wait_node); |
1841 | } | |
1842 | ||
9ad42ec1 | 1843 | error_testpoint: |
099e26bd | 1844 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1845 | if (err) { |
1846 | health_error(); | |
1847 | ERR("Health error occurred in %s", __func__); | |
1848 | } | |
8782cc74 | 1849 | health_unregister(health_sessiond); |
099e26bd DG |
1850 | return NULL; |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * This thread manage application registration. | |
1855 | */ | |
1856 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1857 | { |
139ac872 | 1858 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1859 | uint32_t revents, nb_fd; |
1860 | struct lttng_poll_event events; | |
099e26bd DG |
1861 | /* |
1862 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1863 | * freed in the manage apps thread. | |
1864 | */ | |
1865 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1866 | |
099e26bd | 1867 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1868 | |
6c71277b | 1869 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1870 | |
e547b070 | 1871 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
1872 | goto error_testpoint; |
1873 | } | |
8ac94142 | 1874 | |
1d4b027a DG |
1875 | ret = lttcomm_listen_unix_sock(apps_sock); |
1876 | if (ret < 0) { | |
76d7553f | 1877 | goto error_listen; |
1d4b027a DG |
1878 | } |
1879 | ||
5eb91c98 DG |
1880 | /* |
1881 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1882 | * more will be added to this poll set. | |
1883 | */ | |
d0b96690 | 1884 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1885 | if (ret < 0) { |
76d7553f | 1886 | goto error_create_poll; |
5eb91c98 | 1887 | } |
273ea72c | 1888 | |
5eb91c98 DG |
1889 | /* Add the application registration socket */ |
1890 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1891 | if (ret < 0) { | |
76d7553f | 1892 | goto error_poll_add; |
5eb91c98 | 1893 | } |
273ea72c | 1894 | |
1d4b027a | 1895 | /* Notify all applications to register */ |
0fdd1e2c DG |
1896 | ret = notify_ust_apps(1); |
1897 | if (ret < 0) { | |
1898 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1899 | "Execution continues but there might be problem for already\n" |
1900 | "running applications that wishes to register."); | |
0fdd1e2c | 1901 | } |
1d4b027a DG |
1902 | |
1903 | while (1) { | |
1904 | DBG("Accepting application registration"); | |
273ea72c DG |
1905 | |
1906 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1907 | restart: |
a78af745 | 1908 | health_poll_entry(); |
5eb91c98 | 1909 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1910 | health_poll_exit(); |
273ea72c | 1911 | if (ret < 0) { |
88f2b785 MD |
1912 | /* |
1913 | * Restart interrupted system call. | |
1914 | */ | |
1915 | if (errno == EINTR) { | |
1916 | goto restart; | |
1917 | } | |
273ea72c DG |
1918 | goto error; |
1919 | } | |
1920 | ||
0d9c5d77 DG |
1921 | nb_fd = ret; |
1922 | ||
5eb91c98 | 1923 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1924 | health_code_update(); |
139ac872 | 1925 | |
5eb91c98 DG |
1926 | /* Fetch once the poll data */ |
1927 | revents = LTTNG_POLL_GETEV(&events, i); | |
1928 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1929 | |
5eb91c98 | 1930 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1931 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1932 | if (ret) { |
139ac872 MD |
1933 | err = 0; |
1934 | goto exit; | |
90014c57 | 1935 | } |
1d4b027a | 1936 | |
5eb91c98 DG |
1937 | /* Event on the registration socket */ |
1938 | if (pollfd == apps_sock) { | |
1939 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1940 | ERR("Register apps socket poll error"); | |
1941 | goto error; | |
1942 | } else if (revents & LPOLLIN) { | |
1943 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1944 | if (sock < 0) { | |
1945 | goto error; | |
1946 | } | |
099e26bd | 1947 | |
16c5c8fa DG |
1948 | /* |
1949 | * Set socket timeout for both receiving and ending. | |
1950 | * app_socket_timeout is in seconds, whereas | |
1951 | * lttcomm_setsockopt_rcv_timeout and | |
1952 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1953 | * parameter. | |
1954 | */ | |
1955 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1956 | app_socket_timeout * 1000); | |
1957 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1958 | app_socket_timeout * 1000); | |
1959 | ||
b662582b DG |
1960 | /* |
1961 | * Set the CLOEXEC flag. Return code is useless because | |
1962 | * either way, the show must go on. | |
1963 | */ | |
1964 | (void) utils_set_fd_cloexec(sock); | |
1965 | ||
5eb91c98 | 1966 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1967 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1968 | if (ust_cmd == NULL) { |
76d7553f | 1969 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1970 | goto error; |
1971 | } | |
1d4b027a | 1972 | |
5eb91c98 DG |
1973 | /* |
1974 | * Using message-based transmissions to ensure we don't | |
1975 | * have to deal with partially received messages. | |
1976 | */ | |
4063050c MD |
1977 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1978 | if (ret < 0) { | |
1979 | ERR("Exhausted file descriptors allowed for applications."); | |
1980 | free(ust_cmd); | |
1981 | ret = close(sock); | |
1982 | if (ret) { | |
1983 | PERROR("close"); | |
1984 | } | |
1985 | sock = -1; | |
1986 | continue; | |
1987 | } | |
d88aee68 | 1988 | |
840cb59c | 1989 | health_code_update(); |
d0b96690 DG |
1990 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1991 | if (ret < 0) { | |
5eb91c98 | 1992 | free(ust_cmd); |
d0b96690 | 1993 | /* Close socket of the application. */ |
76d7553f MD |
1994 | ret = close(sock); |
1995 | if (ret) { | |
1996 | PERROR("close"); | |
1997 | } | |
4063050c | 1998 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1999 | sock = -1; |
5eb91c98 DG |
2000 | continue; |
2001 | } | |
840cb59c | 2002 | health_code_update(); |
099e26bd | 2003 | |
5eb91c98 | 2004 | ust_cmd->sock = sock; |
34a2494f | 2005 | sock = -1; |
099e26bd | 2006 | |
5eb91c98 DG |
2007 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2008 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2009 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2010 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2011 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2012 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2013 | |
5eb91c98 DG |
2014 | /* |
2015 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2016 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
2017 | */ |
2018 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
2019 | ||
2020 | /* | |
2021 | * Wake the registration queue futex. Implicit memory | |
2022 | * barrier with the exchange in cds_wfq_enqueue. | |
2023 | */ | |
2024 | futex_nto1_wake(&ust_cmd_queue.futex); | |
2025 | } | |
2026 | } | |
90014c57 | 2027 | } |
1d4b027a DG |
2028 | } |
2029 | ||
139ac872 | 2030 | exit: |
1d4b027a | 2031 | error: |
0fdd1e2c DG |
2032 | /* Notify that the registration thread is gone */ |
2033 | notify_ust_apps(0); | |
2034 | ||
a4b35e07 | 2035 | if (apps_sock >= 0) { |
76d7553f MD |
2036 | ret = close(apps_sock); |
2037 | if (ret) { | |
2038 | PERROR("close"); | |
2039 | } | |
a4b35e07 | 2040 | } |
46c3f085 | 2041 | if (sock >= 0) { |
76d7553f MD |
2042 | ret = close(sock); |
2043 | if (ret) { | |
2044 | PERROR("close"); | |
2045 | } | |
4063050c | 2046 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2047 | } |
273ea72c | 2048 | unlink(apps_unix_sock_path); |
0fdd1e2c | 2049 | |
76d7553f | 2050 | error_poll_add: |
5eb91c98 | 2051 | lttng_poll_clean(&events); |
76d7553f MD |
2052 | error_listen: |
2053 | error_create_poll: | |
6993eeb3 | 2054 | error_testpoint: |
76d7553f | 2055 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2056 | if (err) { |
2057 | health_error(); | |
2058 | ERR("Health error occurred in %s", __func__); | |
2059 | } | |
8782cc74 | 2060 | health_unregister(health_sessiond); |
5eb91c98 | 2061 | |
1d4b027a DG |
2062 | return NULL; |
2063 | } | |
2064 | ||
8c0faa1d | 2065 | /* |
3bd1e081 | 2066 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2067 | * exec or it will fails. |
8c0faa1d | 2068 | */ |
3bd1e081 | 2069 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2070 | { |
a23ec3a7 | 2071 | int ret, clock_ret; |
ee0b0061 DG |
2072 | struct timespec timeout; |
2073 | ||
a23ec3a7 DG |
2074 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
2075 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 2076 | |
a23ec3a7 DG |
2077 | /* Setup pthread condition */ |
2078 | ret = pthread_condattr_init(&consumer_data->condattr); | |
2079 | if (ret != 0) { | |
2080 | errno = ret; | |
2081 | PERROR("pthread_condattr_init consumer data"); | |
2082 | goto error; | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2087 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2088 | * for a more details and how we noticed it. | |
2089 | */ | |
2090 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
2091 | if (ret != 0) { | |
2092 | errno = ret; | |
2093 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2094 | goto error; |
2095 | } | |
8c0faa1d | 2096 | |
a23ec3a7 DG |
2097 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
2098 | if (ret != 0) { | |
2099 | errno = ret; | |
2100 | PERROR("pthread_cond_init consumer data"); | |
2101 | goto error; | |
2102 | } | |
2103 | ||
2104 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
2105 | consumer_data); | |
8c0faa1d | 2106 | if (ret != 0) { |
3bd1e081 | 2107 | PERROR("pthread_create consumer"); |
ee0b0061 | 2108 | ret = -1; |
8c0faa1d DG |
2109 | goto error; |
2110 | } | |
2111 | ||
a23ec3a7 DG |
2112 | /* We are about to wait on a pthread condition */ |
2113 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2114 | ||
ee0b0061 | 2115 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
2116 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
2117 | /* | |
2118 | * Set the timeout for the condition timed wait even if the clock gettime | |
2119 | * call fails since we might loop on that call and we want to avoid to | |
2120 | * increment the timeout too many times. | |
2121 | */ | |
2122 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2123 | ||
2124 | /* | |
2125 | * The following loop COULD be skipped in some conditions so this is why we | |
2126 | * set ret to 0 in order to make sure at least one round of the loop is | |
2127 | * done. | |
2128 | */ | |
2129 | ret = 0; | |
2130 | ||
2131 | /* | |
2132 | * Loop until the condition is reached or when a timeout is reached. Note | |
2133 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2134 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2135 | * possible. This loop does not take any chances and works with both of | |
2136 | * them. | |
2137 | */ | |
2138 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2139 | if (clock_ret < 0) { | |
2140 | PERROR("clock_gettime spawn consumer"); | |
2141 | /* Infinite wait for the consumerd thread to be ready */ | |
2142 | ret = pthread_cond_wait(&consumer_data->cond, | |
2143 | &consumer_data->cond_mutex); | |
2144 | } else { | |
2145 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2146 | &consumer_data->cond_mutex, &timeout); | |
2147 | } | |
ee0b0061 | 2148 | } |
8c0faa1d | 2149 | |
a23ec3a7 DG |
2150 | /* Release the pthread condition */ |
2151 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2152 | ||
2153 | if (ret != 0) { | |
2154 | errno = ret; | |
2155 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2156 | int pth_ret; |
2157 | ||
ee0b0061 DG |
2158 | /* |
2159 | * Call has timed out so we kill the kconsumerd_thread and return | |
2160 | * an error. | |
2161 | */ | |
a23ec3a7 DG |
2162 | ERR("Condition timed out. The consumer thread was never ready." |
2163 | " Killing it"); | |
4282f9a3 DG |
2164 | pth_ret = pthread_cancel(consumer_data->thread); |
2165 | if (pth_ret < 0) { | |
3bd1e081 | 2166 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2167 | } |
2168 | } else { | |
a23ec3a7 | 2169 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2170 | } |
4282f9a3 DG |
2171 | /* Caller is expecting a negative value on failure. */ |
2172 | ret = -1; | |
ee0b0061 DG |
2173 | goto error; |
2174 | } | |
2175 | ||
3bd1e081 MD |
2176 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2177 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2178 | ERR("Consumerd did not start"); |
3bd1e081 | 2179 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2180 | goto error; |
2181 | } | |
3bd1e081 | 2182 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2183 | |
8c0faa1d DG |
2184 | return 0; |
2185 | ||
2186 | error: | |
2187 | return ret; | |
2188 | } | |
2189 | ||
d9800920 | 2190 | /* |
3bd1e081 | 2191 | * Join consumer thread |
d9800920 | 2192 | */ |
3bd1e081 | 2193 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2194 | { |
2195 | void *status; | |
cf3af59e | 2196 | |
e8209f6b DG |
2197 | /* Consumer pid must be a real one. */ |
2198 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2199 | int ret; |
3bd1e081 | 2200 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2201 | if (ret) { |
3bd1e081 | 2202 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2203 | return ret; |
2204 | } | |
3bd1e081 | 2205 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2206 | } else { |
2207 | return 0; | |
2208 | } | |
2209 | } | |
2210 | ||
8c0faa1d | 2211 | /* |
3bd1e081 | 2212 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2213 | * |
d063d709 | 2214 | * Return pid if successful else -1. |
8c0faa1d | 2215 | */ |
3bd1e081 | 2216 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2217 | { |
2218 | int ret; | |
2219 | pid_t pid; | |
94c55f17 | 2220 | const char *consumer_to_use; |
53086306 | 2221 | const char *verbosity; |
94c55f17 | 2222 | struct stat st; |
8c0faa1d | 2223 | |
3bd1e081 | 2224 | DBG("Spawning consumerd"); |
c49dc785 | 2225 | |
8c0faa1d DG |
2226 | pid = fork(); |
2227 | if (pid == 0) { | |
2228 | /* | |
3bd1e081 | 2229 | * Exec consumerd. |
8c0faa1d | 2230 | */ |
daee5345 | 2231 | if (opt_verbose_consumer) { |
53086306 DG |
2232 | verbosity = "--verbose"; |
2233 | } else { | |
2234 | verbosity = "--quiet"; | |
2235 | } | |
3bd1e081 MD |
2236 | switch (consumer_data->type) { |
2237 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2238 | /* |
c7704d57 DG |
2239 | * Find out which consumerd to execute. We will first try the |
2240 | * 64-bit path, then the sessiond's installation directory, and | |
2241 | * fallback on the 32-bit one, | |
94c55f17 | 2242 | */ |
63a799e8 AM |
2243 | DBG3("Looking for a kernel consumer at these locations:"); |
2244 | DBG3(" 1) %s", consumerd64_bin); | |
2245 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2246 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2247 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2248 | DBG3("Found location #1"); |
94c55f17 | 2249 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2250 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2251 | DBG3("Found location #2"); |
94c55f17 | 2252 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2253 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2254 | DBG3("Found location #3"); |
eb1e0bd4 | 2255 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2256 | } else { |
63a799e8 | 2257 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2258 | ret = -EINVAL; |
94c55f17 AM |
2259 | break; |
2260 | } | |
2261 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
4282f9a3 | 2262 | ret = execl(consumer_to_use, |
94c55f17 AM |
2263 | "lttng-consumerd", verbosity, "-k", |
2264 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2265 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2266 | "--group", tracing_group_name, |
94c55f17 | 2267 | NULL); |
3bd1e081 | 2268 | break; |
7753dea8 MD |
2269 | case LTTNG_CONSUMER64_UST: |
2270 | { | |
b1e0b6b6 | 2271 | char *tmpnew = NULL; |
8f4905da MD |
2272 | |
2273 | if (consumerd64_libdir[0] != '\0') { | |
2274 | char *tmp; | |
2275 | size_t tmplen; | |
2276 | ||
2277 | tmp = getenv("LD_LIBRARY_PATH"); | |
2278 | if (!tmp) { | |
2279 | tmp = ""; | |
2280 | } | |
2281 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2282 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2283 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2284 | if (!tmpnew) { | |
2285 | ret = -ENOMEM; | |
2286 | goto error; | |
2287 | } | |
2288 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2289 | strcat(tmpnew, consumerd64_libdir); | |
2290 | if (tmp[0] != '\0') { | |
2291 | strcat(tmpnew, ":"); | |
2292 | strcat(tmpnew, tmp); | |
2293 | } | |
2294 | ret = putenv(tmpnew); | |
2295 | if (ret) { | |
2296 | ret = -errno; | |
c6f76da9 | 2297 | free(tmpnew); |
8f4905da MD |
2298 | goto error; |
2299 | } | |
2300 | } | |
94c55f17 | 2301 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2302 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2303 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2304 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2305 | "--group", tracing_group_name, |
7753dea8 | 2306 | NULL); |
8f4905da MD |
2307 | if (consumerd64_libdir[0] != '\0') { |
2308 | free(tmpnew); | |
2309 | } | |
3bd1e081 | 2310 | break; |
7753dea8 MD |
2311 | } |
2312 | case LTTNG_CONSUMER32_UST: | |
2313 | { | |
937dde8e | 2314 | char *tmpnew = NULL; |
8f4905da MD |
2315 | |
2316 | if (consumerd32_libdir[0] != '\0') { | |
2317 | char *tmp; | |
2318 | size_t tmplen; | |
2319 | ||
2320 | tmp = getenv("LD_LIBRARY_PATH"); | |
2321 | if (!tmp) { | |
2322 | tmp = ""; | |
2323 | } | |
2324 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2325 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2326 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2327 | if (!tmpnew) { | |
2328 | ret = -ENOMEM; | |
2329 | goto error; | |
2330 | } | |
2331 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2332 | strcat(tmpnew, consumerd32_libdir); | |
2333 | if (tmp[0] != '\0') { | |
2334 | strcat(tmpnew, ":"); | |
2335 | strcat(tmpnew, tmp); | |
2336 | } | |
2337 | ret = putenv(tmpnew); | |
2338 | if (ret) { | |
2339 | ret = -errno; | |
c6f76da9 | 2340 | free(tmpnew); |
8f4905da MD |
2341 | goto error; |
2342 | } | |
2343 | } | |
94c55f17 | 2344 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2345 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2346 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2347 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2348 | "--group", tracing_group_name, |
7753dea8 | 2349 | NULL); |
8f4905da MD |
2350 | if (consumerd32_libdir[0] != '\0') { |
2351 | free(tmpnew); | |
2352 | } | |
7753dea8 MD |
2353 | break; |
2354 | } | |
3bd1e081 | 2355 | default: |
76d7553f | 2356 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2357 | exit(EXIT_FAILURE); |
2358 | } | |
8c0faa1d | 2359 | if (errno != 0) { |
4282f9a3 | 2360 | PERROR("Consumer execl()"); |
8c0faa1d | 2361 | } |
4282f9a3 | 2362 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2363 | exit(EXIT_FAILURE); |
2364 | } else if (pid > 0) { | |
2365 | ret = pid; | |
8c0faa1d | 2366 | } else { |
76d7553f | 2367 | PERROR("start consumer fork"); |
8c0faa1d | 2368 | ret = -errno; |
8c0faa1d | 2369 | } |
8f4905da | 2370 | error: |
8c0faa1d DG |
2371 | return ret; |
2372 | } | |
2373 | ||
693bd40b | 2374 | /* |
3bd1e081 | 2375 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2376 | */ |
3bd1e081 | 2377 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2378 | { |
c617c0c6 | 2379 | int ret; |
edb8b045 DG |
2380 | |
2381 | /* | |
2382 | * Set the listen() state on the socket since there is a possible race | |
2383 | * between the exec() of the consumer daemon and this call if place in the | |
2384 | * consumer thread. See bug #366 for more details. | |
2385 | */ | |
2386 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2387 | if (ret < 0) { | |
2388 | goto error; | |
2389 | } | |
693bd40b | 2390 | |
3bd1e081 MD |
2391 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2392 | if (consumer_data->pid != 0) { | |
2393 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2394 | goto end; |
2395 | } | |
693bd40b | 2396 | |
3bd1e081 | 2397 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2398 | if (ret < 0) { |
3bd1e081 MD |
2399 | ERR("Spawning consumerd failed"); |
2400 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2401 | goto error; |
693bd40b | 2402 | } |
c49dc785 | 2403 | |
3bd1e081 MD |
2404 | /* Setting up the consumer_data pid */ |
2405 | consumer_data->pid = ret; | |
48842b30 | 2406 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2407 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2408 | |
3bd1e081 MD |
2409 | DBG2("Spawning consumer control thread"); |
2410 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2411 | if (ret < 0) { |
3bd1e081 | 2412 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2413 | goto error; |
2414 | } | |
2415 | ||
c49dc785 | 2416 | end: |
693bd40b DG |
2417 | return 0; |
2418 | ||
2419 | error: | |
331744e3 | 2420 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2421 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2422 | int err; |
2423 | ||
edb8b045 DG |
2424 | err = close(consumer_data->err_sock); |
2425 | if (err < 0) { | |
2426 | PERROR("close consumer data error socket"); | |
2427 | } | |
2428 | } | |
693bd40b DG |
2429 | return ret; |
2430 | } | |
2431 | ||
b73401da | 2432 | /* |
096102bd | 2433 | * Setup necessary data for kernel tracer action. |
b73401da | 2434 | */ |
096102bd | 2435 | static int init_kernel_tracer(void) |
b73401da DG |
2436 | { |
2437 | int ret; | |
b73401da | 2438 | |
096102bd DG |
2439 | /* Modprobe lttng kernel modules */ |
2440 | ret = modprobe_lttng_control(); | |
b73401da | 2441 | if (ret < 0) { |
b73401da DG |
2442 | goto error; |
2443 | } | |
2444 | ||
096102bd DG |
2445 | /* Open debugfs lttng */ |
2446 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2447 | if (kernel_tracer_fd < 0) { | |
2448 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2449 | ret = -1; |
2450 | goto error_open; | |
54d01ffb DG |
2451 | } |
2452 | ||
2f77fc4b DG |
2453 | /* Validate kernel version */ |
2454 | ret = kernel_validate_version(kernel_tracer_fd); | |
2455 | if (ret < 0) { | |
2456 | goto error_version; | |
b551a063 | 2457 | } |
54d01ffb | 2458 | |
2f77fc4b DG |
2459 | ret = modprobe_lttng_data(); |
2460 | if (ret < 0) { | |
2461 | goto error_modules; | |
54d01ffb DG |
2462 | } |
2463 | ||
2f77fc4b DG |
2464 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2465 | return 0; | |
2466 | ||
2467 | error_version: | |
2468 | modprobe_remove_lttng_control(); | |
2469 | ret = close(kernel_tracer_fd); | |
2470 | if (ret) { | |
2471 | PERROR("close"); | |
b551a063 | 2472 | } |
2f77fc4b | 2473 | kernel_tracer_fd = -1; |
f73fabfd | 2474 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2475 | |
2f77fc4b DG |
2476 | error_modules: |
2477 | ret = close(kernel_tracer_fd); | |
2478 | if (ret) { | |
2479 | PERROR("close"); | |
b551a063 | 2480 | } |
54d01ffb | 2481 | |
2f77fc4b DG |
2482 | error_open: |
2483 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2484 | |
2485 | error: | |
2f77fc4b DG |
2486 | WARN("No kernel tracer available"); |
2487 | kernel_tracer_fd = -1; | |
2488 | if (!is_root) { | |
f73fabfd | 2489 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2490 | } else { |
f73fabfd | 2491 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2492 | } |
54d01ffb DG |
2493 | } |
2494 | ||
2f77fc4b | 2495 | |
54d01ffb | 2496 | /* |
2f77fc4b DG |
2497 | * Copy consumer output from the tracing session to the domain session. The |
2498 | * function also applies the right modification on a per domain basis for the | |
2499 | * trace files destination directory. | |
36b588ed MD |
2500 | * |
2501 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2502 | */ |
2f77fc4b | 2503 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2504 | { |
2505 | int ret; | |
2f77fc4b DG |
2506 | const char *dir_name; |
2507 | struct consumer_output *consumer; | |
2508 | ||
2509 | assert(session); | |
2510 | assert(session->consumer); | |
54d01ffb | 2511 | |
b551a063 DG |
2512 | switch (domain) { |
2513 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2514 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2515 | /* |
2516 | * XXX: We should audit the session creation and what this function | |
2517 | * does "extra" in order to avoid a destroy since this function is used | |
2518 | * in the domain session creation (kernel and ust) only. Same for UST | |
2519 | * domain. | |
2520 | */ | |
2521 | if (session->kernel_session->consumer) { | |
2522 | consumer_destroy_output(session->kernel_session->consumer); | |
2523 | } | |
2f77fc4b DG |
2524 | session->kernel_session->consumer = |
2525 | consumer_copy_output(session->consumer); | |
2526 | /* Ease our life a bit for the next part */ | |
2527 | consumer = session->kernel_session->consumer; | |
2528 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2529 | break; |
f20baf8e | 2530 | case LTTNG_DOMAIN_JUL: |
b551a063 | 2531 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2532 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2533 | if (session->ust_session->consumer) { |
2534 | consumer_destroy_output(session->ust_session->consumer); | |
2535 | } | |
2f77fc4b DG |
2536 | session->ust_session->consumer = |
2537 | consumer_copy_output(session->consumer); | |
2538 | /* Ease our life a bit for the next part */ | |
2539 | consumer = session->ust_session->consumer; | |
2540 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2541 | break; |
2542 | default: | |
f73fabfd | 2543 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2544 | goto error; |
2545 | } | |
2546 | ||
2f77fc4b | 2547 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2548 | strncat(consumer->subdir, dir_name, |
2549 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2550 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2551 | ||
f73fabfd | 2552 | ret = LTTNG_OK; |
54d01ffb DG |
2553 | |
2554 | error: | |
2555 | return ret; | |
2556 | } | |
2557 | ||
00e2e675 | 2558 | /* |
2f77fc4b | 2559 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2560 | * |
2561 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2562 | */ |
2f77fc4b DG |
2563 | static int create_ust_session(struct ltt_session *session, |
2564 | struct lttng_domain *domain) | |
00e2e675 DG |
2565 | { |
2566 | int ret; | |
2f77fc4b | 2567 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2568 | |
a4b92340 | 2569 | assert(session); |
2f77fc4b DG |
2570 | assert(domain); |
2571 | assert(session->consumer); | |
a4b92340 | 2572 | |
2f77fc4b | 2573 | switch (domain->type) { |
f20baf8e | 2574 | case LTTNG_DOMAIN_JUL: |
2f77fc4b DG |
2575 | case LTTNG_DOMAIN_UST: |
2576 | break; | |
2577 | default: | |
2578 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2579 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2580 | goto error; |
2581 | } | |
2582 | ||
2f77fc4b DG |
2583 | DBG("Creating UST session"); |
2584 | ||
dec56f6c | 2585 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2586 | if (lus == NULL) { |
f73fabfd | 2587 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2588 | goto error; |
2589 | } | |
2590 | ||
2f77fc4b DG |
2591 | lus->uid = session->uid; |
2592 | lus->gid = session->gid; | |
2bba9e53 | 2593 | lus->output_traces = session->output_traces; |
27babd3a | 2594 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2595 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2596 | session->ust_session = lus; |
00e2e675 | 2597 | |
2f77fc4b DG |
2598 | /* Copy session output to the newly created UST session */ |
2599 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2600 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2601 | goto error; |
2602 | } | |
2603 | ||
f73fabfd | 2604 | return LTTNG_OK; |
00e2e675 DG |
2605 | |
2606 | error: | |
2f77fc4b DG |
2607 | free(lus); |
2608 | session->ust_session = NULL; | |
00e2e675 DG |
2609 | return ret; |
2610 | } | |
2611 | ||
2612 | /* | |
2f77fc4b | 2613 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2614 | */ |
2f77fc4b | 2615 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2616 | { |
2617 | int ret; | |
a4b92340 | 2618 | |
2f77fc4b | 2619 | DBG("Creating kernel session"); |
00e2e675 | 2620 | |
2f77fc4b DG |
2621 | ret = kernel_create_session(session, kernel_tracer_fd); |
2622 | if (ret < 0) { | |
f73fabfd | 2623 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2624 | goto error; |
2625 | } | |
2626 | ||
2f77fc4b DG |
2627 | /* Code flow safety */ |
2628 | assert(session->kernel_session); | |
2629 | ||
2630 | /* Copy session output to the newly created Kernel session */ | |
2631 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2632 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2633 | goto error; |
2634 | } | |
2635 | ||
2f77fc4b DG |
2636 | /* Create directory(ies) on local filesystem. */ |
2637 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2638 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2639 | ret = run_as_mkdir_recursive( | |
2640 | session->kernel_session->consumer->dst.trace_path, | |
2641 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2642 | if (ret < 0) { | |
2643 | if (ret != -EEXIST) { | |
2644 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2645 | goto error; |
2646 | } | |
00e2e675 | 2647 | } |
2f77fc4b | 2648 | } |
00e2e675 | 2649 | |
2f77fc4b DG |
2650 | session->kernel_session->uid = session->uid; |
2651 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2652 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2653 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2654 | |
f73fabfd | 2655 | return LTTNG_OK; |
00e2e675 | 2656 | |
2f77fc4b DG |
2657 | error: |
2658 | trace_kernel_destroy_session(session->kernel_session); | |
2659 | session->kernel_session = NULL; | |
2660 | return ret; | |
2661 | } | |
00e2e675 | 2662 | |
2f77fc4b DG |
2663 | /* |
2664 | * Count number of session permitted by uid/gid. | |
2665 | */ | |
2666 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2667 | { | |
2668 | unsigned int i = 0; | |
2669 | struct ltt_session *session; | |
07424f16 | 2670 | |
2f77fc4b DG |
2671 | DBG("Counting number of available session for UID %d GID %d", |
2672 | uid, gid); | |
2673 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2674 | /* |
2f77fc4b | 2675 | * Only list the sessions the user can control. |
00e2e675 | 2676 | */ |
2f77fc4b DG |
2677 | if (!session_access_ok(session, uid, gid)) { |
2678 | continue; | |
2679 | } | |
2680 | i++; | |
a4b92340 | 2681 | } |
2f77fc4b | 2682 | return i; |
00e2e675 DG |
2683 | } |
2684 | ||
54d01ffb DG |
2685 | /* |
2686 | * Process the command requested by the lttng client within the command | |
2687 | * context structure. This function make sure that the return structure (llm) | |
2688 | * is set and ready for transmission before returning. | |
2689 | * | |
2690 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2691 | * |
2692 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2693 | * |
2694 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2695 | */ |
53a80697 MD |
2696 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2697 | int *sock_error) | |
54d01ffb | 2698 | { |
f73fabfd | 2699 | int ret = LTTNG_OK; |
44d3bd01 | 2700 | int need_tracing_session = 1; |
2e09ba09 | 2701 | int need_domain; |
54d01ffb DG |
2702 | |
2703 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2704 | ||
53a80697 MD |
2705 | *sock_error = 0; |
2706 | ||
2e09ba09 MD |
2707 | switch (cmd_ctx->lsm->cmd_type) { |
2708 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2709 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2710 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2711 | case LTTNG_DESTROY_SESSION: |
2712 | case LTTNG_LIST_SESSIONS: | |
2713 | case LTTNG_LIST_DOMAINS: | |
2714 | case LTTNG_START_TRACE: | |
2715 | case LTTNG_STOP_TRACE: | |
6d805429 | 2716 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2717 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2718 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2719 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2720 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2721 | need_domain = 0; |
3aace903 | 2722 | break; |
2e09ba09 MD |
2723 | default: |
2724 | need_domain = 1; | |
2725 | } | |
2726 | ||
2727 | if (opt_no_kernel && need_domain | |
2728 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2729 | if (!is_root) { |
f73fabfd | 2730 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2731 | } else { |
f73fabfd | 2732 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2733 | } |
4fba7219 DG |
2734 | goto error; |
2735 | } | |
2736 | ||
8d3113b2 DG |
2737 | /* Deny register consumer if we already have a spawned consumer. */ |
2738 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2739 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2740 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2741 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2742 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2743 | goto error; |
2744 | } | |
2745 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2746 | } | |
2747 | ||
54d01ffb DG |
2748 | /* |
2749 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2750 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2751 | * command. |
2752 | */ | |
2753 | switch(cmd_ctx->lsm->cmd_type) { | |
2754 | case LTTNG_LIST_SESSIONS: | |
2755 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2756 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2757 | case LTTNG_LIST_DOMAINS: |
2758 | case LTTNG_LIST_CHANNELS: | |
2759 | case LTTNG_LIST_EVENTS: | |
2760 | break; | |
2761 | default: | |
2762 | /* Setup lttng message with no payload */ | |
2763 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2764 | if (ret < 0) { | |
2765 | /* This label does not try to unlock the session */ | |
2766 | goto init_setup_error; | |
2767 | } | |
2768 | } | |
2769 | ||
2770 | /* Commands that DO NOT need a session. */ | |
2771 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2772 | case LTTNG_CREATE_SESSION: |
27babd3a | 2773 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2774 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 | 2775 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2776 | case LTTNG_LIST_SESSIONS: |
2777 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2778 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2779 | need_tracing_session = 0; |
54d01ffb DG |
2780 | break; |
2781 | default: | |
2782 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2783 | /* |
2784 | * We keep the session list lock across _all_ commands | |
2785 | * for now, because the per-session lock does not | |
2786 | * handle teardown properly. | |
2787 | */ | |
74babd95 | 2788 | session_lock_list(); |
54d01ffb DG |
2789 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2790 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2791 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2792 | goto error; |
2793 | } else { | |
2794 | /* Acquire lock for the session */ | |
2795 | session_lock(cmd_ctx->session); | |
2796 | } | |
2797 | break; | |
2798 | } | |
b389abbe | 2799 | |
2e09ba09 MD |
2800 | if (!need_domain) { |
2801 | goto skip_domain; | |
2802 | } | |
a4b92340 | 2803 | |
54d01ffb DG |
2804 | /* |
2805 | * Check domain type for specific "pre-action". | |
2806 | */ | |
2807 | switch (cmd_ctx->lsm->domain.type) { | |
2808 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2809 | if (!is_root) { |
f73fabfd | 2810 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2811 | goto error; |
2812 | } | |
2813 | ||
54d01ffb | 2814 | /* Kernel tracer check */ |
a4b35e07 | 2815 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2816 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2817 | ret = init_kernel_tracer(); |
2818 | if (ret != 0) { | |
54d01ffb DG |
2819 | goto error; |
2820 | } | |
2821 | } | |
5eb91c98 | 2822 | |
5c827ce0 DG |
2823 | /* Consumer is in an ERROR state. Report back to client */ |
2824 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2825 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2826 | goto error; |
2827 | } | |
2828 | ||
54d01ffb | 2829 | /* Need a session for kernel command */ |
44d3bd01 | 2830 | if (need_tracing_session) { |
54d01ffb | 2831 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2832 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2833 | if (ret < 0) { |
f73fabfd | 2834 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2835 | goto error; |
2836 | } | |
b389abbe | 2837 | } |
7d29a247 | 2838 | |
54d01ffb | 2839 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2840 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2841 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2842 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2843 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2844 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2845 | if (ret < 0) { |
f73fabfd | 2846 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2847 | goto error; |
950131af | 2848 | } |
5c827ce0 | 2849 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2850 | } else { |
2851 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2852 | } |
173af62f | 2853 | |
a4b92340 DG |
2854 | /* |
2855 | * The consumer was just spawned so we need to add the socket to | |
2856 | * the consumer output of the session if exist. | |
2857 | */ | |
2858 | ret = consumer_create_socket(&kconsumer_data, | |
2859 | cmd_ctx->session->kernel_session->consumer); | |
2860 | if (ret < 0) { | |
2861 | goto error; | |
173af62f | 2862 | } |
0d0c377a | 2863 | } |
5c827ce0 | 2864 | |
54d01ffb | 2865 | break; |
b9dfb167 | 2866 | case LTTNG_DOMAIN_JUL: |
2bdd86d4 | 2867 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2868 | { |
b51ec5b4 MD |
2869 | if (!ust_app_supported()) { |
2870 | ret = LTTNG_ERR_NO_UST; | |
2871 | goto error; | |
2872 | } | |
5c827ce0 DG |
2873 | /* Consumer is in an ERROR state. Report back to client */ |
2874 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2875 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2876 | goto error; |
2877 | } | |
2878 | ||
44d3bd01 | 2879 | if (need_tracing_session) { |
a4b92340 | 2880 | /* Create UST session if none exist. */ |
f6a9efaa | 2881 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2882 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2883 | &cmd_ctx->lsm->domain); |
f73fabfd | 2884 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2885 | goto error; |
2886 | } | |
2887 | } | |
00e2e675 | 2888 | |
7753dea8 MD |
2889 | /* Start the UST consumer daemons */ |
2890 | /* 64-bit */ | |
2891 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2892 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2893 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2894 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2895 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2896 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2897 | if (ret < 0) { |
f73fabfd | 2898 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2899 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2900 | goto error; |
2901 | } | |
48842b30 | 2902 | |
173af62f | 2903 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2904 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2905 | } else { |
7753dea8 MD |
2906 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2907 | } | |
173af62f DG |
2908 | |
2909 | /* | |
2910 | * Setup socket for consumer 64 bit. No need for atomic access | |
2911 | * since it was set above and can ONLY be set in this thread. | |
2912 | */ | |
a4b92340 DG |
2913 | ret = consumer_create_socket(&ustconsumer64_data, |
2914 | cmd_ctx->session->ust_session->consumer); | |
2915 | if (ret < 0) { | |
2916 | goto error; | |
173af62f DG |
2917 | } |
2918 | ||
7753dea8 | 2919 | /* 32-bit */ |
fc7a59ce | 2920 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2921 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2922 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2923 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2924 | ret = start_consumerd(&ustconsumer32_data); | |
2925 | if (ret < 0) { | |
f73fabfd | 2926 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2927 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2928 | goto error; |
2929 | } | |
5c827ce0 | 2930 | |
173af62f | 2931 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2932 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2933 | } else { |
2934 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2935 | } |
173af62f DG |
2936 | |
2937 | /* | |
2938 | * Setup socket for consumer 64 bit. No need for atomic access | |
2939 | * since it was set above and can ONLY be set in this thread. | |
2940 | */ | |
a4b92340 DG |
2941 | ret = consumer_create_socket(&ustconsumer32_data, |
2942 | cmd_ctx->session->ust_session->consumer); | |
2943 | if (ret < 0) { | |
2944 | goto error; | |
173af62f | 2945 | } |
44d3bd01 DG |
2946 | } |
2947 | break; | |
48842b30 | 2948 | } |
54d01ffb | 2949 | default: |
54d01ffb DG |
2950 | break; |
2951 | } | |
2e09ba09 | 2952 | skip_domain: |
33a2b854 | 2953 | |
5c827ce0 DG |
2954 | /* Validate consumer daemon state when start/stop trace command */ |
2955 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2956 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2957 | switch (cmd_ctx->lsm->domain.type) { | |
b9dfb167 | 2958 | case LTTNG_DOMAIN_JUL: |
5c827ce0 DG |
2959 | case LTTNG_DOMAIN_UST: |
2960 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2961 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2962 | goto error; |
2963 | } | |
2964 | break; | |
2965 | case LTTNG_DOMAIN_KERNEL: | |
2966 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2967 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2968 | goto error; |
2969 | } | |
2970 | break; | |
2971 | } | |
2972 | } | |
2973 | ||
8e0af1b4 MD |
2974 | /* |
2975 | * Check that the UID or GID match that of the tracing session. | |
2976 | * The root user can interact with all sessions. | |
2977 | */ | |
2978 | if (need_tracing_session) { | |
2979 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2980 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2981 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2982 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2983 | goto error; |
2984 | } | |
2985 | } | |
2986 | ||
ffe60014 DG |
2987 | /* |
2988 | * Send relayd information to consumer as soon as we have a domain and a | |
2989 | * session defined. | |
2990 | */ | |
2991 | if (cmd_ctx->session && need_domain) { | |
2992 | /* | |
2993 | * Setup relayd if not done yet. If the relayd information was already | |
2994 | * sent to the consumer, this call will gracefully return. | |
2995 | */ | |
2996 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2997 | if (ret != LTTNG_OK) { | |
2998 | goto error; | |
2999 | } | |
3000 | } | |
3001 | ||
54d01ffb DG |
3002 | /* Process by command type */ |
3003 | switch (cmd_ctx->lsm->cmd_type) { | |
3004 | case LTTNG_ADD_CONTEXT: | |
3005 | { | |
3006 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3007 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 3008 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
3009 | break; |
3010 | } | |
3011 | case LTTNG_DISABLE_CHANNEL: | |
3012 | { | |
3013 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3014 | cmd_ctx->lsm->u.disable.channel_name); | |
3015 | break; | |
3016 | } | |
3017 | case LTTNG_DISABLE_EVENT: | |
3018 | { | |
3019 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3020 | cmd_ctx->lsm->u.disable.channel_name, | |
3021 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3022 | break; |
3023 | } | |
54d01ffb DG |
3024 | case LTTNG_DISABLE_ALL_EVENT: |
3025 | { | |
2bdd86d4 | 3026 | DBG("Disabling all events"); |
54d01ffb DG |
3027 | |
3028 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3029 | cmd_ctx->lsm->u.disable.channel_name); | |
3030 | break; | |
3031 | } | |
3032 | case LTTNG_ENABLE_CHANNEL: | |
3033 | { | |
7972aab2 | 3034 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 3035 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
3036 | break; |
3037 | } | |
3038 | case LTTNG_ENABLE_EVENT: | |
3039 | { | |
882ef835 JI |
3040 | struct lttng_event_exclusion *exclusion = NULL; |
3041 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3042 | char *filter_expression = NULL; |
882ef835 | 3043 | |
67676bd8 DG |
3044 | /* Handle exclusion events and receive it from the client. */ |
3045 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3046 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3047 | ||
3048 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3049 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3050 | if (!exclusion) { | |
3051 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3052 | goto error; | |
882ef835 | 3053 | } |
882ef835 | 3054 | |
67676bd8 DG |
3055 | DBG("Receiving var len exclusion event list from client ..."); |
3056 | exclusion->count = count; | |
3057 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3058 | count * LTTNG_SYMBOL_NAME_LEN); | |
3059 | if (ret <= 0) { | |
3060 | DBG("Nothing recv() from client var len data... continuing"); | |
3061 | *sock_error = 1; | |
3062 | free(exclusion); | |
3063 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3064 | goto error; | |
3065 | } | |
3066 | } | |
3067 | ||
6b453b5e JG |
3068 | /* Get filter expression from client. */ |
3069 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3070 | size_t expression_len = | |
3071 | cmd_ctx->lsm->u.enable.expression_len; | |
3072 | ||
3073 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3074 | ret = LTTNG_ERR_FILTER_INVAL; | |
3075 | free(exclusion); | |
3076 | goto error; | |
3077 | } | |
3078 | ||
3079 | filter_expression = zmalloc(expression_len); | |
3080 | if (!filter_expression) { | |
3081 | free(exclusion); | |
3082 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3083 | goto error; | |
3084 | } | |
3085 | ||
3086 | /* Receive var. len. data */ | |
3087 | DBG("Receiving var len filter's expression from client ..."); | |
3088 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3089 | expression_len); | |
3090 | if (ret <= 0) { | |
3091 | DBG("Nothing recv() from client car len data... continuing"); | |
3092 | *sock_error = 1; | |
3093 | free(filter_expression); | |
3094 | free(exclusion); | |
3095 | ret = LTTNG_ERR_FILTER_INVAL; | |
3096 | goto error; | |
3097 | } | |
3098 | } | |
3099 | ||
67676bd8 DG |
3100 | /* Handle filter and get bytecode from client. */ |
3101 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3102 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3103 | ||
3104 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3105 | ret = LTTNG_ERR_FILTER_INVAL; | |
3106 | free(exclusion); | |
3107 | goto error; | |
3108 | } | |
3109 | ||
3110 | bytecode = zmalloc(bytecode_len); | |
3111 | if (!bytecode) { | |
3112 | free(exclusion); | |
3113 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3114 | goto error; | |
882ef835 JI |
3115 | } |
3116 | ||
67676bd8 DG |
3117 | /* Receive var. len. data */ |
3118 | DBG("Receiving var len filter's bytecode from client ..."); | |
3119 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3120 | if (ret <= 0) { | |
3121 | DBG("Nothing recv() from client car len data... continuing"); | |
3122 | *sock_error = 1; | |
3123 | free(bytecode); | |
3124 | free(exclusion); | |
3125 | ret = LTTNG_ERR_FILTER_INVAL; | |
3126 | goto error; | |
3127 | } | |
3128 | ||
3129 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
3130 | free(bytecode); | |
3131 | free(exclusion); | |
3132 | ret = LTTNG_ERR_FILTER_INVAL; | |
3133 | goto error; | |
3134 | } | |
882ef835 | 3135 | } |
67676bd8 DG |
3136 | |
3137 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3138 | cmd_ctx->lsm->u.enable.channel_name, | |
6b453b5e JG |
3139 | &cmd_ctx->lsm->u.enable.event, |
3140 | filter_expression, bytecode, exclusion, | |
67676bd8 | 3141 | kernel_poll_pipe[1]); |
54d01ffb DG |
3142 | break; |
3143 | } | |
3144 | case LTTNG_ENABLE_ALL_EVENT: | |
3145 | { | |
2bdd86d4 | 3146 | DBG("Enabling all events"); |
54d01ffb | 3147 | |
7972aab2 | 3148 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 3149 | cmd_ctx->lsm->u.enable.channel_name, |
6b453b5e JG |
3150 | cmd_ctx->lsm->u.enable.event.type, NULL, NULL, |
3151 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3152 | break; |
3153 | } | |
052da939 | 3154 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3155 | { |
9f19cc17 | 3156 | struct lttng_event *events; |
54d01ffb | 3157 | ssize_t nb_events; |
052da939 | 3158 | |
54d01ffb DG |
3159 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3160 | if (nb_events < 0) { | |
f73fabfd | 3161 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3162 | ret = -nb_events; |
3163 | goto error; | |
2ef84c95 DG |
3164 | } |
3165 | ||
3166 | /* | |
3167 | * Setup lttng message with payload size set to the event list size in | |
3168 | * bytes and then copy list into the llm payload. | |
3169 | */ | |
052da939 | 3170 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3171 | if (ret < 0) { |
052da939 | 3172 | free(events); |
2ef84c95 DG |
3173 | goto setup_error; |
3174 | } | |
3175 | ||
3176 | /* Copy event list into message payload */ | |
9f19cc17 | 3177 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3178 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3179 | |
9f19cc17 | 3180 | free(events); |
2ef84c95 | 3181 | |
f73fabfd | 3182 | ret = LTTNG_OK; |
2ef84c95 DG |
3183 | break; |
3184 | } | |
f37d259d MD |
3185 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3186 | { | |
3187 | struct lttng_event_field *fields; | |
3188 | ssize_t nb_fields; | |
3189 | ||
a4b92340 DG |
3190 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3191 | &fields); | |
f37d259d | 3192 | if (nb_fields < 0) { |
f73fabfd | 3193 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3194 | ret = -nb_fields; |
3195 | goto error; | |
3196 | } | |
3197 | ||
3198 | /* | |
3199 | * Setup lttng message with payload size set to the event list size in | |
3200 | * bytes and then copy list into the llm payload. | |
3201 | */ | |
a4b92340 DG |
3202 | ret = setup_lttng_msg(cmd_ctx, |
3203 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
3204 | if (ret < 0) { |
3205 | free(fields); | |
3206 | goto setup_error; | |
3207 | } | |
3208 | ||
3209 | /* Copy event list into message payload */ | |
3210 | memcpy(cmd_ctx->llm->payload, fields, | |
3211 | sizeof(struct lttng_event_field) * nb_fields); | |
3212 | ||
3213 | free(fields); | |
3214 | ||
f73fabfd | 3215 | ret = LTTNG_OK; |
f37d259d MD |
3216 | break; |
3217 | } | |
00e2e675 DG |
3218 | case LTTNG_SET_CONSUMER_URI: |
3219 | { | |
a4b92340 DG |
3220 | size_t nb_uri, len; |
3221 | struct lttng_uri *uris; | |
3222 | ||
3223 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3224 | len = nb_uri * sizeof(struct lttng_uri); | |
3225 | ||
3226 | if (nb_uri == 0) { | |
f73fabfd | 3227 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3228 | goto error; |
3229 | } | |
3230 | ||
3231 | uris = zmalloc(len); | |
3232 | if (uris == NULL) { | |
f73fabfd | 3233 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3234 | goto error; |
3235 | } | |
3236 | ||
3237 | /* Receive variable len data */ | |
77c7c900 | 3238 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3239 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3240 | if (ret <= 0) { | |
3241 | DBG("No URIs received from client... continuing"); | |
3242 | *sock_error = 1; | |
f73fabfd | 3243 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3244 | free(uris); |
a4b92340 DG |
3245 | goto error; |
3246 | } | |
3247 | ||
00e2e675 | 3248 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 3249 | nb_uri, uris); |
f73fabfd | 3250 | if (ret != LTTNG_OK) { |
b1d41407 | 3251 | free(uris); |
a4b92340 DG |
3252 | goto error; |
3253 | } | |
3254 | ||
3255 | /* | |
3256 | * XXX: 0 means that this URI should be applied on the session. Should | |
3257 | * be a DOMAIN enuam. | |
3258 | */ | |
3259 | if (cmd_ctx->lsm->domain.type == 0) { | |
3260 | /* Add the URI for the UST session if a consumer is present. */ | |
3261 | if (cmd_ctx->session->ust_session && | |
3262 | cmd_ctx->session->ust_session->consumer) { | |
3263 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
3264 | nb_uri, uris); | |
3265 | } else if (cmd_ctx->session->kernel_session && | |
3266 | cmd_ctx->session->kernel_session->consumer) { | |
3267 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
3268 | cmd_ctx->session, nb_uri, uris); | |
3269 | } | |
3270 | } | |
3271 | ||
b1d41407 DG |
3272 | free(uris); |
3273 | ||
00e2e675 DG |
3274 | break; |
3275 | } | |
f3ed775e | 3276 | case LTTNG_START_TRACE: |
8c0faa1d | 3277 | { |
54d01ffb | 3278 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3279 | break; |
3280 | } | |
f3ed775e | 3281 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3282 | { |
54d01ffb | 3283 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3284 | break; |
3285 | } | |
5e16da05 MD |
3286 | case LTTNG_CREATE_SESSION: |
3287 | { | |
a4b92340 DG |
3288 | size_t nb_uri, len; |
3289 | struct lttng_uri *uris = NULL; | |
3290 | ||
3291 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3292 | len = nb_uri * sizeof(struct lttng_uri); | |
3293 | ||
3294 | if (nb_uri > 0) { | |
3295 | uris = zmalloc(len); | |
3296 | if (uris == NULL) { | |
f73fabfd | 3297 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3298 | goto error; |
3299 | } | |
3300 | ||
3301 | /* Receive variable len data */ | |
77c7c900 | 3302 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3303 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3304 | if (ret <= 0) { | |
3305 | DBG("No URIs received from client... continuing"); | |
3306 | *sock_error = 1; | |
f73fabfd | 3307 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3308 | free(uris); |
a4b92340 DG |
3309 | goto error; |
3310 | } | |
3311 | ||
3312 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3313 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3314 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3315 | free(uris); |
a4b92340 DG |
3316 | goto error; |
3317 | } | |
3318 | } | |
3319 | ||
3320 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3321 | &cmd_ctx->creds, 0); |
a4b92340 | 3322 | |
b1d41407 DG |
3323 | free(uris); |
3324 | ||
00e2e675 DG |
3325 | break; |
3326 | } | |
5e16da05 MD |
3327 | case LTTNG_DESTROY_SESSION: |
3328 | { | |
2f77fc4b | 3329 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3330 | |
3331 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3332 | cmd_ctx->session = NULL; |
5461b305 | 3333 | break; |
5e16da05 | 3334 | } |
9f19cc17 | 3335 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3336 | { |
54d01ffb DG |
3337 | ssize_t nb_dom; |
3338 | struct lttng_domain *domains; | |
5461b305 | 3339 | |
54d01ffb DG |
3340 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3341 | if (nb_dom < 0) { | |
f73fabfd | 3342 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3343 | ret = -nb_dom; |
3344 | goto error; | |
ce3d728c | 3345 | } |
520ff687 | 3346 | |
54d01ffb | 3347 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3348 | if (ret < 0) { |
ae9c20bc | 3349 | free(domains); |
5461b305 | 3350 | goto setup_error; |
520ff687 | 3351 | } |
57167058 | 3352 | |
54d01ffb DG |
3353 | /* Copy event list into message payload */ |
3354 | memcpy(cmd_ctx->llm->payload, domains, | |
3355 | nb_dom * sizeof(struct lttng_domain)); | |
3356 | ||
3357 | free(domains); | |
5e16da05 | 3358 | |
f73fabfd | 3359 | ret = LTTNG_OK; |
5e16da05 MD |
3360 | break; |
3361 | } | |
9f19cc17 | 3362 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3363 | { |
6775595e | 3364 | int nb_chan; |
54d01ffb DG |
3365 | struct lttng_channel *channels; |
3366 | ||
b551a063 DG |
3367 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3368 | cmd_ctx->session, &channels); | |
54d01ffb | 3369 | if (nb_chan < 0) { |
f73fabfd | 3370 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3371 | ret = -nb_chan; |
3372 | goto error; | |
5461b305 | 3373 | } |
ca95a216 | 3374 | |
54d01ffb | 3375 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3376 | if (ret < 0) { |
ae9c20bc | 3377 | free(channels); |
5461b305 DG |
3378 | goto setup_error; |
3379 | } | |
9f19cc17 | 3380 | |
54d01ffb DG |
3381 | /* Copy event list into message payload */ |
3382 | memcpy(cmd_ctx->llm->payload, channels, | |
3383 | nb_chan * sizeof(struct lttng_channel)); | |
3384 | ||
3385 | free(channels); | |
9f19cc17 | 3386 | |
f73fabfd | 3387 | ret = LTTNG_OK; |
5461b305 | 3388 | break; |
5e16da05 | 3389 | } |
9f19cc17 | 3390 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3391 | { |
b551a063 | 3392 | ssize_t nb_event; |
684d34d2 | 3393 | struct lttng_event *events = NULL; |
9f19cc17 | 3394 | |
b551a063 | 3395 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3396 | cmd_ctx->lsm->u.list.channel_name, &events); |
3397 | if (nb_event < 0) { | |
f73fabfd | 3398 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3399 | ret = -nb_event; |
3400 | goto error; | |
5461b305 | 3401 | } |
ca95a216 | 3402 | |
54d01ffb | 3403 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3404 | if (ret < 0) { |
ae9c20bc | 3405 | free(events); |
5461b305 DG |
3406 | goto setup_error; |
3407 | } | |
9f19cc17 | 3408 | |
54d01ffb DG |
3409 | /* Copy event list into message payload */ |
3410 | memcpy(cmd_ctx->llm->payload, events, | |
3411 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3412 | |
54d01ffb | 3413 | free(events); |
9f19cc17 | 3414 | |
f73fabfd | 3415 | ret = LTTNG_OK; |
5461b305 | 3416 | break; |
5e16da05 MD |
3417 | } |
3418 | case LTTNG_LIST_SESSIONS: | |
3419 | { | |
8e0af1b4 | 3420 | unsigned int nr_sessions; |
5461b305 | 3421 | |
8e0af1b4 | 3422 | session_lock_list(); |
730389d9 DG |
3423 | nr_sessions = lttng_sessions_count( |
3424 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3425 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3426 | |
8e0af1b4 | 3427 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3428 | if (ret < 0) { |
54d01ffb | 3429 | session_unlock_list(); |
5461b305 | 3430 | goto setup_error; |
e065084a | 3431 | } |
5e16da05 | 3432 | |
6c9cc2ab | 3433 | /* Filled the session array */ |
2f77fc4b | 3434 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3435 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3436 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3437 | |
54d01ffb | 3438 | session_unlock_list(); |
5e16da05 | 3439 | |
f73fabfd | 3440 | ret = LTTNG_OK; |
5e16da05 MD |
3441 | break; |
3442 | } | |
d0254c7c MD |
3443 | case LTTNG_CALIBRATE: |
3444 | { | |
54d01ffb DG |
3445 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3446 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3447 | break; |
3448 | } | |
d9800920 DG |
3449 | case LTTNG_REGISTER_CONSUMER: |
3450 | { | |
2f77fc4b DG |
3451 | struct consumer_data *cdata; |
3452 | ||
3453 | switch (cmd_ctx->lsm->domain.type) { | |
3454 | case LTTNG_DOMAIN_KERNEL: | |
3455 | cdata = &kconsumer_data; | |
3456 | break; | |
3457 | default: | |
f73fabfd | 3458 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3459 | goto error; |
3460 | } | |
3461 | ||
54d01ffb | 3462 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3463 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3464 | break; |
3465 | } | |
6d805429 | 3466 | case LTTNG_DATA_PENDING: |
806e2684 | 3467 | { |
6d805429 | 3468 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3469 | break; |
3470 | } | |
da3c9ec1 DG |
3471 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3472 | { | |
6dc3064a DG |
3473 | struct lttcomm_lttng_output_id reply; |
3474 | ||
3475 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3476 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3477 | if (ret != LTTNG_OK) { | |
3478 | goto error; | |
3479 | } | |
3480 | ||
3481 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3482 | if (ret < 0) { | |
3483 | goto setup_error; | |
3484 | } | |
3485 | ||
3486 | /* Copy output list into message payload */ | |
3487 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3488 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3489 | break; |
3490 | } | |
3491 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3492 | { | |
6dc3064a DG |
3493 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3494 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3495 | break; |
3496 | } | |
3497 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3498 | { | |
6dc3064a DG |
3499 | ssize_t nb_output; |
3500 | struct lttng_snapshot_output *outputs = NULL; | |
3501 | ||
3502 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3503 | if (nb_output < 0) { | |
3504 | ret = -nb_output; | |
3505 | goto error; | |
3506 | } | |
3507 | ||
3508 | ret = setup_lttng_msg(cmd_ctx, | |
3509 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3510 | if (ret < 0) { | |
3511 | free(outputs); | |
3512 | goto setup_error; | |
3513 | } | |
3514 | ||
3515 | if (outputs) { | |
3516 | /* Copy output list into message payload */ | |
3517 | memcpy(cmd_ctx->llm->payload, outputs, | |
3518 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3519 | free(outputs); | |
3520 | } | |
3521 | ||
3522 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3523 | break; |
3524 | } | |
3525 | case LTTNG_SNAPSHOT_RECORD: | |
3526 | { | |
6dc3064a DG |
3527 | ret = cmd_snapshot_record(cmd_ctx->session, |
3528 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3529 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3530 | break; |
3531 | } | |
27babd3a DG |
3532 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3533 | { | |
3534 | size_t nb_uri, len; | |
3535 | struct lttng_uri *uris = NULL; | |
3536 | ||
3537 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3538 | len = nb_uri * sizeof(struct lttng_uri); | |
3539 | ||
3540 | if (nb_uri > 0) { | |
3541 | uris = zmalloc(len); | |
3542 | if (uris == NULL) { | |
3543 | ret = LTTNG_ERR_FATAL; | |
3544 | goto error; | |
3545 | } | |
3546 | ||
3547 | /* Receive variable len data */ | |
3548 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3549 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3550 | if (ret <= 0) { | |
3551 | DBG("No URIs received from client... continuing"); | |
3552 | *sock_error = 1; | |
3553 | ret = LTTNG_ERR_SESSION_FAIL; | |
3554 | free(uris); | |
3555 | goto error; | |
3556 | } | |
3557 | ||
3558 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3559 | DBG("Creating session with ONE network URI is a bad call"); | |
3560 | ret = LTTNG_ERR_SESSION_FAIL; | |
3561 | free(uris); | |
3562 | goto error; | |
3563 | } | |
3564 | } | |
3565 | ||
3566 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3567 | nb_uri, &cmd_ctx->creds); | |
3568 | free(uris); | |
3569 | break; | |
3570 | } | |
ecc48a90 JD |
3571 | case LTTNG_CREATE_SESSION_LIVE: |
3572 | { | |
3573 | size_t nb_uri, len; | |
3574 | struct lttng_uri *uris = NULL; | |
3575 | ||
3576 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3577 | len = nb_uri * sizeof(struct lttng_uri); | |
3578 | ||
3579 | if (nb_uri > 0) { | |
3580 | uris = zmalloc(len); | |
3581 | if (uris == NULL) { | |
3582 | ret = LTTNG_ERR_FATAL; | |
3583 | goto error; | |
3584 | } | |
3585 | ||
3586 | /* Receive variable len data */ | |
3587 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3588 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3589 | if (ret <= 0) { | |
3590 | DBG("No URIs received from client... continuing"); | |
3591 | *sock_error = 1; | |
3592 | ret = LTTNG_ERR_SESSION_FAIL; | |
3593 | free(uris); | |
3594 | goto error; | |
3595 | } | |
3596 | ||
3597 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3598 | DBG("Creating session with ONE network URI is a bad call"); | |
3599 | ret = LTTNG_ERR_SESSION_FAIL; | |
3600 | free(uris); | |
3601 | goto error; | |
3602 | } | |
3603 | } | |
3604 | ||
3605 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
3606 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
3607 | free(uris); | |
3608 | break; | |
3609 | } | |
5e16da05 | 3610 | default: |
f73fabfd | 3611 | ret = LTTNG_ERR_UND; |
5461b305 | 3612 | break; |
fac6795d DG |
3613 | } |
3614 | ||
5461b305 | 3615 | error: |
5461b305 DG |
3616 | if (cmd_ctx->llm == NULL) { |
3617 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3618 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3619 | goto setup_error; |
3620 | } | |
3621 | } | |
54d01ffb | 3622 | /* Set return code */ |
5461b305 | 3623 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3624 | setup_error: |
b5541356 | 3625 | if (cmd_ctx->session) { |
54d01ffb | 3626 | session_unlock(cmd_ctx->session); |
b5541356 | 3627 | } |
256a5576 MD |
3628 | if (need_tracing_session) { |
3629 | session_unlock_list(); | |
3630 | } | |
54d01ffb | 3631 | init_setup_error: |
8028d920 | 3632 | return ret; |
fac6795d DG |
3633 | } |
3634 | ||
44a5e5eb DG |
3635 | /* |
3636 | * Thread managing health check socket. | |
3637 | */ | |
3638 | static void *thread_manage_health(void *data) | |
3639 | { | |
eb4a2943 | 3640 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3641 | uint32_t revents, nb_fd; |
3642 | struct lttng_poll_event events; | |
0c89d795 MD |
3643 | struct health_comm_msg msg; |
3644 | struct health_comm_reply reply; | |
44a5e5eb DG |
3645 | |
3646 | DBG("[thread] Manage health check started"); | |
3647 | ||
3648 | rcu_register_thread(); | |
3649 | ||
6d737ce4 DG |
3650 | /* We might hit an error path before this is created. */ |
3651 | lttng_poll_init(&events); | |
3cc04881 | 3652 | |
44a5e5eb DG |
3653 | /* Create unix socket */ |
3654 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3655 | if (sock < 0) { | |
3656 | ERR("Unable to create health check Unix socket"); | |
3657 | ret = -1; | |
3658 | goto error; | |
3659 | } | |
3660 | ||
6c71277b MD |
3661 | if (is_root) { |
3662 | /* lttng health client socket path permissions */ | |
3663 | ret = chown(health_unix_sock_path, 0, | |
3664 | utils_get_group_id(tracing_group_name)); | |
3665 | if (ret < 0) { | |
3666 | ERR("Unable to set group on %s", health_unix_sock_path); | |
3667 | PERROR("chown"); | |
3668 | ret = -1; | |
3669 | goto error; | |
3670 | } | |
3671 | ||
3672 | ret = chmod(health_unix_sock_path, | |
3673 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3674 | if (ret < 0) { | |
3675 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
3676 | PERROR("chmod"); | |
3677 | ret = -1; | |
3678 | goto error; | |
3679 | } | |
3680 | } | |
3681 | ||
b662582b DG |
3682 | /* |
3683 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3684 | * show must go on. | |
3685 | */ | |
3686 | (void) utils_set_fd_cloexec(sock); | |
3687 | ||
44a5e5eb DG |
3688 | ret = lttcomm_listen_unix_sock(sock); |
3689 | if (ret < 0) { | |
3690 | goto error; | |
3691 | } | |
3692 | ||
3693 | /* | |
3694 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3695 | * more will be added to this poll set. | |
3696 | */ | |
d0b96690 | 3697 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3698 | if (ret < 0) { |
3699 | goto error; | |
3700 | } | |
3701 | ||
3702 | /* Add the application registration socket */ | |
3703 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3704 | if (ret < 0) { | |
3705 | goto error; | |
3706 | } | |
3707 | ||
97bc1426 MD |
3708 | lttng_sessiond_notify_ready(); |
3709 | ||
44a5e5eb DG |
3710 | while (1) { |
3711 | DBG("Health check ready"); | |
3712 | ||
44a5e5eb DG |
3713 | /* Inifinite blocking call, waiting for transmission */ |
3714 | restart: | |
3715 | ret = lttng_poll_wait(&events, -1); | |
3716 | if (ret < 0) { | |
3717 | /* | |
3718 | * Restart interrupted system call. | |
3719 | */ | |
3720 | if (errno == EINTR) { | |
3721 | goto restart; | |
3722 | } | |
3723 | goto error; | |
3724 | } | |
3725 | ||
0d9c5d77 DG |
3726 | nb_fd = ret; |
3727 | ||
44a5e5eb DG |
3728 | for (i = 0; i < nb_fd; i++) { |
3729 | /* Fetch once the poll data */ | |
3730 | revents = LTTNG_POLL_GETEV(&events, i); | |
3731 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3732 | ||
3733 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3734 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3735 | if (ret) { |
139ac872 MD |
3736 | err = 0; |
3737 | goto exit; | |
44a5e5eb DG |
3738 | } |
3739 | ||
3740 | /* Event on the registration socket */ | |
3741 | if (pollfd == sock) { | |
3742 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3743 | ERR("Health socket poll error"); | |
3744 | goto error; | |
3745 | } | |
3746 | } | |
3747 | } | |
3748 | ||
3749 | new_sock = lttcomm_accept_unix_sock(sock); | |
3750 | if (new_sock < 0) { | |
3751 | goto error; | |
3752 | } | |
3753 | ||
b662582b DG |
3754 | /* |
3755 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3756 | * show must go on. | |
3757 | */ | |
3758 | (void) utils_set_fd_cloexec(new_sock); | |
3759 | ||
44a5e5eb DG |
3760 | DBG("Receiving data from client for health..."); |
3761 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3762 | if (ret <= 0) { | |
3763 | DBG("Nothing recv() from client... continuing"); | |
3764 | ret = close(new_sock); | |
3765 | if (ret) { | |
3766 | PERROR("close"); | |
3767 | } | |
3768 | new_sock = -1; | |
3769 | continue; | |
3770 | } | |
3771 | ||
3772 | rcu_thread_online(); | |
3773 | ||
53efb85a | 3774 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
3775 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
3776 | /* | |
3777 | * health_check_state returns 0 if health is | |
3778 | * bad. | |
3779 | */ | |
3780 | if (!health_check_state(health_sessiond, i)) { | |
3781 | reply.ret_code |= 1ULL << i; | |
3782 | } | |
44a5e5eb DG |
3783 | } |
3784 | ||
6c71277b | 3785 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
3786 | |
3787 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3788 | if (ret < 0) { | |
3789 | ERR("Failed to send health data back to client"); | |
3790 | } | |
3791 | ||
3792 | /* End of transmission */ | |
3793 | ret = close(new_sock); | |
3794 | if (ret) { | |
3795 | PERROR("close"); | |
3796 | } | |
3797 | new_sock = -1; | |
3798 | } | |
3799 | ||
139ac872 | 3800 | exit: |
44a5e5eb | 3801 | error: |
139ac872 MD |
3802 | if (err) { |
3803 | ERR("Health error occurred in %s", __func__); | |
3804 | } | |
44a5e5eb DG |
3805 | DBG("Health check thread dying"); |
3806 | unlink(health_unix_sock_path); | |
3807 | if (sock >= 0) { | |
3808 | ret = close(sock); | |
3809 | if (ret) { | |
3810 | PERROR("close"); | |
3811 | } | |
3812 | } | |
44a5e5eb DG |
3813 | |
3814 | lttng_poll_clean(&events); | |
3815 | ||
3816 | rcu_unregister_thread(); | |
3817 | return NULL; | |
3818 | } | |
3819 | ||
1d4b027a | 3820 | /* |
d063d709 DG |
3821 | * This thread manage all clients request using the unix client socket for |
3822 | * communication. | |
1d4b027a DG |
3823 | */ |
3824 | static void *thread_manage_clients(void *data) | |
3825 | { | |
139ac872 | 3826 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3827 | int sock_error; |
5eb91c98 | 3828 | uint32_t revents, nb_fd; |
273ea72c | 3829 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3830 | struct lttng_poll_event events; |
1d4b027a DG |
3831 | |
3832 | DBG("[thread] Manage client started"); | |
3833 | ||
f6a9efaa DG |
3834 | rcu_register_thread(); |
3835 | ||
6c71277b | 3836 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 3837 | |
840cb59c | 3838 | health_code_update(); |
44a5e5eb | 3839 | |
1d4b027a DG |
3840 | ret = lttcomm_listen_unix_sock(client_sock); |
3841 | if (ret < 0) { | |
35df2755 | 3842 | goto error_listen; |
1d4b027a DG |
3843 | } |
3844 | ||
5eb91c98 DG |
3845 | /* |
3846 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3847 | * more will be added to this poll set. | |
3848 | */ | |
d0b96690 | 3849 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3850 | if (ret < 0) { |
35df2755 | 3851 | goto error_create_poll; |
5eb91c98 | 3852 | } |
273ea72c | 3853 | |
5eb91c98 DG |
3854 | /* Add the application registration socket */ |
3855 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3856 | if (ret < 0) { | |
3857 | goto error; | |
3858 | } | |
273ea72c | 3859 | |
97bc1426 | 3860 | lttng_sessiond_notify_ready(); |
0bb7724a | 3861 | |
72453c8c MD |
3862 | /* This testpoint is after we signal readiness to the parent. */ |
3863 | if (testpoint(sessiond_thread_manage_clients)) { | |
3864 | goto error; | |
3865 | } | |
3866 | ||
e547b070 | 3867 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
3868 | goto error; |
3869 | } | |
8ac94142 | 3870 | |
840cb59c | 3871 | health_code_update(); |
44a5e5eb | 3872 | |
1d4b027a | 3873 | while (1) { |
1d4b027a | 3874 | DBG("Accepting client command ..."); |
273ea72c DG |
3875 | |
3876 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3877 | restart: |
a78af745 | 3878 | health_poll_entry(); |
5eb91c98 | 3879 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3880 | health_poll_exit(); |
273ea72c | 3881 | if (ret < 0) { |
88f2b785 MD |
3882 | /* |
3883 | * Restart interrupted system call. | |
3884 | */ | |
3885 | if (errno == EINTR) { | |
3886 | goto restart; | |
3887 | } | |
273ea72c DG |
3888 | goto error; |
3889 | } | |
3890 | ||
0d9c5d77 DG |
3891 | nb_fd = ret; |
3892 | ||
5eb91c98 DG |
3893 | for (i = 0; i < nb_fd; i++) { |
3894 | /* Fetch once the poll data */ | |
3895 | revents = LTTNG_POLL_GETEV(&events, i); | |
3896 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3897 | ||
840cb59c | 3898 | health_code_update(); |
44a5e5eb | 3899 | |
5eb91c98 | 3900 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3901 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3902 | if (ret) { |
139ac872 MD |
3903 | err = 0; |
3904 | goto exit; | |
5eb91c98 DG |
3905 | } |
3906 | ||
3907 | /* Event on the registration socket */ | |
3908 | if (pollfd == client_sock) { | |
3909 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3910 | ERR("Client socket poll error"); | |
3911 | goto error; | |
3912 | } | |
3913 | } | |
3914 | } | |
3915 | ||
3916 | DBG("Wait for client response"); | |
3917 | ||
840cb59c | 3918 | health_code_update(); |
44a5e5eb | 3919 | |
5eb91c98 DG |
3920 | sock = lttcomm_accept_unix_sock(client_sock); |
3921 | if (sock < 0) { | |
273ea72c | 3922 | goto error; |
273ea72c DG |
3923 | } |
3924 | ||
b662582b DG |
3925 | /* |
3926 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3927 | * show must go on. | |
3928 | */ | |
3929 | (void) utils_set_fd_cloexec(sock); | |
3930 | ||
be040666 DG |
3931 | /* Set socket option for credentials retrieval */ |
3932 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3933 | if (ret < 0) { | |
3934 | goto error; | |
3935 | } | |
3936 | ||
5eb91c98 | 3937 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3938 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3939 | if (cmd_ctx == NULL) { |
76d7553f | 3940 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3941 | goto error; |
5eb91c98 | 3942 | } |
1d4b027a | 3943 | |
5eb91c98 | 3944 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3945 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3946 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3947 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3948 | goto error; |
3949 | } | |
1d4b027a | 3950 | |
5eb91c98 DG |
3951 | cmd_ctx->llm = NULL; |
3952 | cmd_ctx->session = NULL; | |
1d4b027a | 3953 | |
840cb59c | 3954 | health_code_update(); |
44a5e5eb | 3955 | |
5eb91c98 DG |
3956 | /* |
3957 | * Data is received from the lttng client. The struct | |
3958 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3959 | * the client. | |
3960 | */ | |
3961 | DBG("Receiving data from client ..."); | |
be040666 DG |
3962 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3963 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3964 | if (ret <= 0) { |
3965 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3966 | ret = close(sock); |
3967 | if (ret) { | |
3968 | PERROR("close"); | |
3969 | } | |
3970 | sock = -1; | |
a2c0da86 | 3971 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3972 | continue; |
3973 | } | |
1d4b027a | 3974 | |
840cb59c | 3975 | health_code_update(); |
44a5e5eb | 3976 | |
5eb91c98 DG |
3977 | // TODO: Validate cmd_ctx including sanity check for |
3978 | // security purpose. | |
f7776ea7 | 3979 | |
f6a9efaa | 3980 | rcu_thread_online(); |
5eb91c98 DG |
3981 | /* |
3982 | * This function dispatch the work to the kernel or userspace tracer | |
3983 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3984 | * informations for the client. The command context struct contains | |
3985 | * everything this function may needs. | |
3986 | */ | |
53a80697 | 3987 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3988 | rcu_thread_offline(); |
5eb91c98 | 3989 | if (ret < 0) { |
36134aa1 DG |
3990 | ret = close(sock); |
3991 | if (ret) { | |
3992 | PERROR("close"); | |
53a80697 | 3993 | } |
36134aa1 | 3994 | sock = -1; |
bbd973c2 | 3995 | /* |
5eb91c98 | 3996 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3997 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3998 | * (ENOMEM). Error detected but still accept |
3999 | * command, unless a socket error has been | |
4000 | * detected. | |
bbd973c2 | 4001 | */ |
bbd973c2 | 4002 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4003 | continue; |
4004 | } | |
d6e4fca4 | 4005 | |
840cb59c | 4006 | health_code_update(); |
44a5e5eb | 4007 | |
54d01ffb DG |
4008 | DBG("Sending response (size: %d, retcode: %s)", |
4009 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 4010 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 4011 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4012 | if (ret < 0) { |
4013 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4014 | } |
1d4b027a | 4015 | |
5eb91c98 | 4016 | /* End of transmission */ |
76d7553f MD |
4017 | ret = close(sock); |
4018 | if (ret) { | |
4019 | PERROR("close"); | |
4020 | } | |
4021 | sock = -1; | |
be040666 DG |
4022 | |
4023 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4024 | |
840cb59c | 4025 | health_code_update(); |
273ea72c DG |
4026 | } |
4027 | ||
139ac872 | 4028 | exit: |
5eb91c98 | 4029 | error: |
35df2755 CB |
4030 | if (sock >= 0) { |
4031 | ret = close(sock); | |
4032 | if (ret) { | |
4033 | PERROR("close"); | |
4034 | } | |
139ac872 | 4035 | } |
44a5e5eb | 4036 | |
35df2755 CB |
4037 | lttng_poll_clean(&events); |
4038 | clean_command_ctx(&cmd_ctx); | |
4039 | ||
4040 | error_listen: | |
4041 | error_create_poll: | |
273ea72c | 4042 | unlink(client_unix_sock_path); |
76d7553f MD |
4043 | if (client_sock >= 0) { |
4044 | ret = close(client_sock); | |
4045 | if (ret) { | |
4046 | PERROR("close"); | |
4047 | } | |
a4b35e07 | 4048 | } |
35df2755 CB |
4049 | |
4050 | if (err) { | |
840cb59c | 4051 | health_error(); |
35df2755 | 4052 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4053 | } |
273ea72c | 4054 | |
8782cc74 | 4055 | health_unregister(health_sessiond); |
35df2755 CB |
4056 | |
4057 | DBG("Client thread dying"); | |
f6a9efaa DG |
4058 | |
4059 | rcu_unregister_thread(); | |
1d4b027a DG |
4060 | return NULL; |
4061 | } | |
4062 | ||
4063 | ||
fac6795d DG |
4064 | /* |
4065 | * usage function on stderr | |
4066 | */ | |
4067 | static void usage(void) | |
4068 | { | |
b716ce68 | 4069 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
4070 | fprintf(stderr, " -h, --help Display this usage.\n"); |
4071 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
4072 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
4073 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
4074 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
4075 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
4076 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
4077 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
4078 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
4079 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
4080 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
4081 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4082 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 | 4083 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
72dd7491 | 4084 | fprintf(stderr, " -b, --background Start as a daemon, keeping console open.\n"); |
d6f42150 DG |
4085 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
4086 | fprintf(stderr, " -V, --version Show version number.\n"); | |
7fe6d2c5 | 4087 | fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n"); |
d6f42150 DG |
4088 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
4089 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 4090 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 4091 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4092 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
4d076222 | 4093 | fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n"); |
26296c48 | 4094 | fprintf(stderr, " -f --config Load daemon configuration file\n"); |
fac6795d DG |
4095 | } |
4096 | ||
4097 | /* | |
26296c48 JG |
4098 | * Take an option from the getopt output and set it in the right variable to be |
4099 | * used later. | |
4100 | * | |
4101 | * Return 0 on success else a negative value. | |
fac6795d | 4102 | */ |
26296c48 | 4103 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4104 | { |
26296c48 | 4105 | int ret = 0; |
fac6795d | 4106 | |
26296c48 JG |
4107 | switch (opt) { |
4108 | case 0: | |
4109 | fprintf(stderr, "option %s", optname); | |
4110 | if (arg) { | |
4111 | fprintf(stderr, " with arg %s\n", arg); | |
fac6795d | 4112 | } |
26296c48 JG |
4113 | break; |
4114 | case 'c': | |
4115 | snprintf(client_unix_sock_path, PATH_MAX, "%s", arg); | |
4116 | break; | |
4117 | case 'a': | |
4118 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg); | |
4119 | break; | |
4120 | case 'd': | |
4121 | opt_daemon = 1; | |
4122 | break; | |
72dd7491 MD |
4123 | case 'b': |
4124 | opt_background = 1; | |
4125 | break; | |
26296c48 JG |
4126 | case 'g': |
4127 | tracing_group_name = strdup(arg); | |
4128 | break; | |
4129 | case 'h': | |
4130 | usage(); | |
4131 | exit(EXIT_FAILURE); | |
4132 | case 'V': | |
4133 | fprintf(stdout, "%s\n", VERSION); | |
4134 | exit(EXIT_SUCCESS); | |
4135 | case 'S': | |
4136 | opt_sig_parent = 1; | |
4137 | break; | |
4138 | case 'E': | |
4139 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4140 | break; | |
4141 | case 'C': | |
4142 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4143 | break; | |
4144 | case 'F': | |
4145 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4146 | break; | |
4147 | case 'D': | |
4148 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4149 | break; | |
4150 | case 'H': | |
4151 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4152 | break; | |
4153 | case 'G': | |
4154 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4155 | break; | |
4156 | case 'N': | |
4157 | opt_no_kernel = 1; | |
4158 | break; | |
4159 | case 'q': | |
4160 | lttng_opt_quiet = 1; | |
4161 | break; | |
4162 | case 'v': | |
4163 | /* Verbose level can increase using multiple -v */ | |
4164 | if (arg) { | |
4165 | lttng_opt_verbose = config_parse_value(arg); | |
4166 | } else { | |
97e19046 | 4167 | lttng_opt_verbose += 1; |
26296c48 JG |
4168 | } |
4169 | break; | |
4170 | case 'Z': | |
4171 | if (arg) { | |
4172 | opt_verbose_consumer = config_parse_value(arg); | |
4173 | } else { | |
3bd1e081 | 4174 | opt_verbose_consumer += 1; |
26296c48 JG |
4175 | } |
4176 | break; | |
4177 | case 'u': | |
4178 | consumerd32_bin = strdup(arg); | |
4179 | consumerd32_bin_override = 1; | |
4180 | break; | |
4181 | case 'U': | |
4182 | consumerd32_libdir = strdup(arg); | |
4183 | consumerd32_libdir_override = 1; | |
4184 | break; | |
4185 | case 't': | |
4186 | consumerd64_bin = strdup(arg); | |
4187 | consumerd64_bin_override = 1; | |
4188 | break; | |
4189 | case 'T': | |
4190 | consumerd64_libdir = strdup(arg); | |
4191 | consumerd64_libdir_override = 1; | |
4192 | break; | |
4193 | case 'p': | |
4194 | opt_pidfile = strdup(arg); | |
4195 | break; | |
4196 | case 'J': /* JUL TCP port. */ | |
4197 | { | |
4198 | unsigned long v; | |
4d076222 | 4199 | |
26296c48 JG |
4200 | errno = 0; |
4201 | v = strtoul(arg, NULL, 0); | |
4202 | if (errno != 0 || !isdigit(arg[0])) { | |
4203 | ERR("Wrong value in --jul-tcp-port parameter: %s", arg); | |
4204 | return -1; | |
4205 | } | |
4206 | if (v == 0 || v >= 65535) { | |
4207 | ERR("Port overflow in --jul-tcp-port parameter: %s", arg); | |
4208 | return -1; | |
4209 | } | |
4210 | jul_tcp_port = (uint32_t) v; | |
4211 | DBG3("JUL TCP port set to non default: %u", jul_tcp_port); | |
4212 | break; | |
4213 | } | |
4214 | default: | |
4215 | /* Unknown option or other error. | |
4216 | * Error is printed by getopt, just return */ | |
4217 | ret = -1; | |
4218 | } | |
4219 | ||
4220 | return ret; | |
4221 | } | |
4222 | ||
4223 | /* | |
4224 | * config_entry_handler_cb used to handle options read from a config file. | |
4225 | * See config_entry_handler_cb comment in common/config/config.h for the | |
4226 | * return value conventions. | |
4227 | */ | |
4228 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
4229 | { | |
4230 | int ret = 0, i; | |
4231 | ||
4232 | if (!entry || !entry->name || !entry->value) { | |
4233 | ret = -EINVAL; | |
4234 | goto end; | |
4235 | } | |
4236 | ||
4237 | /* Check if the option is to be ignored */ | |
4238 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
4239 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
4240 | goto end; | |
4241 | } | |
4242 | } | |
4243 | ||
4244 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
4245 | i++) { | |
4246 | ||
4247 | /* Ignore if not fully matched. */ | |
4248 | if (strcmp(entry->name, long_options[i].name)) { | |
4249 | continue; | |
4250 | } | |
4251 | ||
4252 | /* | |
4253 | * If the option takes no argument on the command line, we have to | |
4254 | * check if the value is "true". We support non-zero numeric values, | |
4255 | * true, on and yes. | |
4256 | */ | |
4257 | if (!long_options[i].has_arg) { | |
4258 | ret = config_parse_value(entry->value); | |
4259 | if (ret <= 0) { | |
4260 | if (ret) { | |
4261 | WARN("Invalid configuration value \"%s\" for option %s", | |
4262 | entry->value, entry->name); | |
4263 | } | |
4264 | /* False, skip boolean config option. */ | |
4265 | goto end; | |
4d076222 | 4266 | } |
26296c48 JG |
4267 | } |
4268 | ||
4269 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
4270 | goto end; | |
4271 | } | |
4272 | ||
4273 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
4274 | ||
4275 | end: | |
4276 | return ret; | |
4277 | } | |
4278 | ||
4279 | /* | |
4280 | * daemon configuration loading and argument parsing | |
4281 | */ | |
4282 | static int set_options(int argc, char **argv) | |
4283 | { | |
4284 | int ret = 0, c = 0, option_index = 0; | |
4285 | int orig_optopt = optopt, orig_optind = optind; | |
4286 | char *optstring; | |
4287 | const char *config_path = NULL; | |
4288 | ||
4289 | optstring = utils_generate_optstring(long_options, | |
4290 | sizeof(long_options) / sizeof(struct option)); | |
4291 | if (!optstring) { | |
4292 | ret = -ENOMEM; | |
4293 | goto end; | |
4294 | } | |
4295 | ||
4296 | /* Check for the --config option */ | |
4297 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
4298 | &option_index)) != -1) { | |
4299 | if (c == '?') { | |
4300 | ret = -EINVAL; | |
4301 | goto end; | |
4302 | } else if (c != 'f') { | |
4303 | /* if not equal to --config option. */ | |
4304 | continue; | |
4305 | } | |
4306 | ||
4307 | config_path = utils_expand_path(optarg); | |
4308 | if (!config_path) { | |
4309 | ERR("Failed to resolve path: %s", optarg); | |
4310 | } | |
4311 | } | |
4312 | ||
4313 | ret = config_get_section_entries(config_path, config_section_name, | |
4314 | config_entry_handler, NULL); | |
4315 | if (ret) { | |
4316 | if (ret > 0) { | |
4317 | ERR("Invalid configuration option at line %i", ret); | |
4318 | ret = -1; | |
4319 | } | |
4320 | goto end; | |
4321 | } | |
4322 | ||
4323 | /* Reset getopt's global state */ | |
4324 | optopt = orig_optopt; | |
4325 | optind = orig_optind; | |
4326 | while (1) { | |
4327 | c = getopt_long(argc, argv, optstring, long_options, &option_index); | |
4328 | if (c == -1) { | |
4d076222 DG |
4329 | break; |
4330 | } | |
26296c48 JG |
4331 | |
4332 | ret = set_option(c, optarg, long_options[option_index].name); | |
4333 | if (ret < 0) { | |
4334 | break; | |
fac6795d DG |
4335 | } |
4336 | } | |
4337 | ||
26296c48 JG |
4338 | end: |
4339 | free(optstring); | |
4340 | return ret; | |
fac6795d DG |
4341 | } |
4342 | ||
4343 | /* | |
d063d709 | 4344 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4345 | * apps_sock - The communication socket for all UST apps. |
4346 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4347 | */ |
cf3af59e | 4348 | static int init_daemon_socket(void) |
fac6795d DG |
4349 | { |
4350 | int ret = 0; | |
4351 | mode_t old_umask; | |
4352 | ||
4353 | old_umask = umask(0); | |
4354 | ||
4355 | /* Create client tool unix socket */ | |
d6f42150 DG |
4356 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4357 | if (client_sock < 0) { | |
4358 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4359 | ret = -1; |
4360 | goto end; | |
4361 | } | |
4362 | ||
b662582b DG |
4363 | /* Set the cloexec flag */ |
4364 | ret = utils_set_fd_cloexec(client_sock); | |
4365 | if (ret < 0) { | |
4366 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4367 | "Continuing but note that the consumer daemon will have a " | |
4368 | "reference to this socket on exec()", client_sock); | |
4369 | } | |
4370 | ||
fac6795d DG |
4371 | /* File permission MUST be 660 */ |
4372 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4373 | if (ret < 0) { | |
d6f42150 | 4374 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4375 | PERROR("chmod"); |
fac6795d DG |
4376 | goto end; |
4377 | } | |
4378 | ||
4379 | /* Create the application unix socket */ | |
d6f42150 DG |
4380 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4381 | if (apps_sock < 0) { | |
4382 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4383 | ret = -1; |
4384 | goto end; | |
4385 | } | |
4386 | ||
b662582b DG |
4387 | /* Set the cloexec flag */ |
4388 | ret = utils_set_fd_cloexec(apps_sock); | |
4389 | if (ret < 0) { | |
4390 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4391 | "Continuing but note that the consumer daemon will have a " | |
4392 | "reference to this socket on exec()", apps_sock); | |
4393 | } | |
4394 | ||
d6f42150 | 4395 | /* File permission MUST be 666 */ |
54d01ffb DG |
4396 | ret = chmod(apps_unix_sock_path, |
4397 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4398 | if (ret < 0) { |
d6f42150 | 4399 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4400 | PERROR("chmod"); |
fac6795d DG |
4401 | goto end; |
4402 | } | |
4403 | ||
b662582b DG |
4404 | DBG3("Session daemon client socket %d and application socket %d created", |
4405 | client_sock, apps_sock); | |
4406 | ||
fac6795d DG |
4407 | end: |
4408 | umask(old_umask); | |
4409 | return ret; | |
4410 | } | |
4411 | ||
4412 | /* | |
54d01ffb DG |
4413 | * Check if the global socket is available, and if a daemon is answering at the |
4414 | * other side. If yes, error is returned. | |
fac6795d | 4415 | */ |
cf3af59e | 4416 | static int check_existing_daemon(void) |
fac6795d | 4417 | { |
7d8234d9 | 4418 | /* Is there anybody out there ? */ |
099e26bd | 4419 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4420 | return -EEXIST; |
099e26bd | 4421 | } |
b09c7c76 DG |
4422 | |
4423 | return 0; | |
fac6795d DG |
4424 | } |
4425 | ||
fac6795d | 4426 | /* |
d063d709 | 4427 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4428 | * |
d063d709 | 4429 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4430 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4431 | */ |
be040666 | 4432 | static int set_permissions(char *rundir) |
fac6795d DG |
4433 | { |
4434 | int ret; | |
996b65c8 | 4435 | gid_t gid; |
fac6795d | 4436 | |
6c71277b | 4437 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 4438 | |
d6f42150 | 4439 | /* Set lttng run dir */ |
be040666 | 4440 | ret = chown(rundir, 0, gid); |
d6f42150 | 4441 | if (ret < 0) { |
be040666 | 4442 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4443 | PERROR("chown"); |
d6f42150 DG |
4444 | } |
4445 | ||
6c71277b MD |
4446 | /* |
4447 | * Ensure all applications and tracing group can search the run | |
4448 | * dir. Allow everyone to read the directory, since it does not | |
4449 | * buy us anything to hide its content. | |
4450 | */ | |
4451 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
4452 | if (ret < 0) { |
4453 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4454 | PERROR("chmod"); |
d1613cf5 JN |
4455 | } |
4456 | ||
d6f42150 | 4457 | /* lttng client socket path */ |
996b65c8 | 4458 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4459 | if (ret < 0) { |
d6f42150 | 4460 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4461 | PERROR("chown"); |
d6f42150 DG |
4462 | } |
4463 | ||
3bd1e081 | 4464 | /* kconsumer error socket path */ |
6c71277b | 4465 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 4466 | if (ret < 0) { |
3bd1e081 | 4467 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4468 | PERROR("chown"); |
3bd1e081 MD |
4469 | } |
4470 | ||
7753dea8 | 4471 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 4472 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
4473 | if (ret < 0) { |
4474 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4475 | PERROR("chown"); |
7753dea8 MD |
4476 | } |
4477 | ||
4478 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 4479 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 4480 | if (ret < 0) { |
7753dea8 | 4481 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4482 | PERROR("chown"); |
fac6795d DG |
4483 | } |
4484 | ||
d6f42150 | 4485 | DBG("All permissions are set"); |
e07ae692 | 4486 | |
fac6795d DG |
4487 | return ret; |
4488 | } | |
4489 | ||
d6f42150 | 4490 | /* |
d063d709 | 4491 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4492 | */ |
67e40797 | 4493 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4494 | { |
4495 | int ret; | |
4496 | ||
67e40797 DG |
4497 | DBG3("Creating LTTng run directory: %s", rundir); |
4498 | ||
d1613cf5 | 4499 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4500 | if (ret < 0) { |
b1f11e69 | 4501 | if (errno != EEXIST) { |
67e40797 | 4502 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4503 | goto error; |
4504 | } else { | |
4505 | ret = 0; | |
4506 | } | |
d6f42150 DG |
4507 | } |
4508 | ||
4509 | error: | |
4510 | return ret; | |
4511 | } | |
4512 | ||
4513 | /* | |
d063d709 DG |
4514 | * Setup sockets and directory needed by the kconsumerd communication with the |
4515 | * session daemon. | |
d6f42150 | 4516 | */ |
67e40797 DG |
4517 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4518 | const char *rundir) | |
d6f42150 DG |
4519 | { |
4520 | int ret; | |
67e40797 | 4521 | char path[PATH_MAX]; |
d6f42150 | 4522 | |
6c71277b | 4523 | switch (consumer_data->type) { |
7753dea8 | 4524 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4525 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4526 | break; |
4527 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4528 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4529 | break; |
4530 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4531 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4532 | break; |
4533 | default: | |
4534 | ERR("Consumer type unknown"); | |
4535 | ret = -EINVAL; | |
4536 | goto error; | |
d6f42150 DG |
4537 | } |
4538 | ||
67e40797 DG |
4539 | DBG2("Creating consumer directory: %s", path); |
4540 | ||
6c71277b | 4541 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 4542 | if (ret < 0) { |
6beb2242 | 4543 | if (errno != EEXIST) { |
f11e84c2 | 4544 | PERROR("mkdir"); |
3bd1e081 | 4545 | ERR("Failed to create %s", path); |
6beb2242 DG |
4546 | goto error; |
4547 | } | |
f11e84c2 | 4548 | ret = -1; |
d6f42150 | 4549 | } |
6c71277b MD |
4550 | if (is_root) { |
4551 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
4552 | if (ret < 0) { | |
4553 | ERR("Unable to set group on %s", path); | |
4554 | PERROR("chown"); | |
4555 | goto error; | |
4556 | } | |
4557 | } | |
d6f42150 DG |
4558 | |
4559 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4560 | consumer_data->err_sock = |
4561 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4562 | if (consumer_data->err_sock < 0) { | |
4563 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4564 | ret = -1; |
4565 | goto error; | |
4566 | } | |
4567 | ||
a24f05ab MD |
4568 | /* |
4569 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4570 | * show must go on. | |
4571 | */ | |
4572 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4573 | if (ret < 0) { | |
4574 | PERROR("utils_set_fd_cloexec"); | |
4575 | /* continue anyway */ | |
4576 | } | |
4577 | ||
d6f42150 | 4578 | /* File permission MUST be 660 */ |
3bd1e081 | 4579 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4580 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4581 | if (ret < 0) { |
3bd1e081 | 4582 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4583 | PERROR("chmod"); |
d6f42150 DG |
4584 | goto error; |
4585 | } | |
4586 | ||
4587 | error: | |
4588 | return ret; | |
4589 | } | |
4590 | ||
fac6795d | 4591 | /* |
d063d709 | 4592 | * Signal handler for the daemon |
cf3af59e | 4593 | * |
54d01ffb DG |
4594 | * Simply stop all worker threads, leaving main() return gracefully after |
4595 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4596 | */ |
4597 | static void sighandler(int sig) | |
4598 | { | |
4599 | switch (sig) { | |
cf3af59e | 4600 | case SIGPIPE: |
af87c45a | 4601 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4602 | return; |
4603 | case SIGINT: | |
af87c45a | 4604 | DBG("SIGINT caught"); |
cf3af59e MD |
4605 | stop_threads(); |
4606 | break; | |
4607 | case SIGTERM: | |
af87c45a | 4608 | DBG("SIGTERM caught"); |
cf3af59e MD |
4609 | stop_threads(); |
4610 | break; | |
0bb7724a DG |
4611 | case SIGUSR1: |
4612 | CMM_STORE_SHARED(recv_child_signal, 1); | |
4613 | break; | |
cf3af59e MD |
4614 | default: |
4615 | break; | |
fac6795d | 4616 | } |
fac6795d DG |
4617 | } |
4618 | ||
4619 | /* | |
d063d709 | 4620 | * Setup signal handler for : |
1d4b027a | 4621 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4622 | */ |
1d4b027a | 4623 | static int set_signal_handler(void) |
fac6795d | 4624 | { |
1d4b027a DG |
4625 | int ret = 0; |
4626 | struct sigaction sa; | |
4627 | sigset_t sigset; | |
fac6795d | 4628 | |
1d4b027a | 4629 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4630 | PERROR("sigemptyset"); |
1d4b027a DG |
4631 | return ret; |
4632 | } | |
d6f42150 | 4633 | |
1d4b027a DG |
4634 | sa.sa_handler = sighandler; |
4635 | sa.sa_mask = sigset; | |
4636 | sa.sa_flags = 0; | |
4637 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4638 | PERROR("sigaction"); |
1d4b027a | 4639 | return ret; |
d6f42150 DG |
4640 | } |
4641 | ||
1d4b027a | 4642 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4643 | PERROR("sigaction"); |
1d4b027a | 4644 | return ret; |
d6f42150 | 4645 | } |
aaf26714 | 4646 | |
1d4b027a | 4647 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4648 | PERROR("sigaction"); |
1d4b027a | 4649 | return ret; |
8c0faa1d DG |
4650 | } |
4651 | ||
0bb7724a DG |
4652 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
4653 | PERROR("sigaction"); | |
4654 | return ret; | |
4655 | } | |
4656 | ||
4657 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
4658 | |
4659 | return ret; | |
fac6795d DG |
4660 | } |
4661 | ||
f3ed775e | 4662 | /* |
d063d709 DG |
4663 | * Set open files limit to unlimited. This daemon can open a large number of |
4664 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4665 | */ |
4666 | static void set_ulimit(void) | |
4667 | { | |
4668 | int ret; | |
4669 | struct rlimit lim; | |
4670 | ||
a88df331 | 4671 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4672 | lim.rlim_cur = 65535; |
4673 | lim.rlim_max = 65535; | |
4674 | ||
4675 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4676 | if (ret < 0) { | |
76d7553f | 4677 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4678 | } |
4679 | } | |
4680 | ||
35f90c40 DG |
4681 | /* |
4682 | * Write pidfile using the rundir and opt_pidfile. | |
4683 | */ | |
4684 | static void write_pidfile(void) | |
4685 | { | |
4686 | int ret; | |
4687 | char pidfile_path[PATH_MAX]; | |
4688 | ||
4689 | assert(rundir); | |
4690 | ||
4691 | if (opt_pidfile) { | |
4692 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4693 | } else { | |
4694 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4695 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4696 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4697 | if (ret < 0) { | |
4698 | PERROR("snprintf pidfile path"); | |
4699 | goto error; | |
4700 | } | |
4701 | } | |
4702 | ||
4703 | /* | |
4704 | * Create pid file in rundir. Return value is of no importance. The | |
4705 | * execution will continue even though we are not able to write the file. | |
4706 | */ | |
4707 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4708 | ||
4709 | error: | |
4710 | return; | |
4711 | } | |
4712 | ||
cd9290dd DG |
4713 | /* |
4714 | * Write JUL TCP port using the rundir. | |
4715 | */ | |
4716 | static void write_julport(void) | |
4717 | { | |
4718 | int ret; | |
4719 | char path[PATH_MAX]; | |
4720 | ||
4721 | assert(rundir); | |
4722 | ||
4723 | ret = snprintf(path, sizeof(path), "%s/" | |
4724 | DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir); | |
4725 | if (ret < 0) { | |
4726 | PERROR("snprintf julport path"); | |
4727 | goto error; | |
4728 | } | |
4729 | ||
4730 | /* | |
4731 | * Create TCP JUL port file in rundir. Return value is of no importance. | |
4732 | * The execution will continue even though we are not able to write the | |
4733 | * file. | |
4734 | */ | |
4735 | (void) utils_create_pid_file(jul_tcp_port, path); | |
4736 | ||
4737 | error: | |
4738 | return; | |
4739 | } | |
4740 | ||
fac6795d DG |
4741 | /* |
4742 | * main | |
4743 | */ | |
4744 | int main(int argc, char **argv) | |
4745 | { | |
fac6795d DG |
4746 | int ret = 0; |
4747 | void *status; | |
ae9e45b3 | 4748 | const char *home_path, *env_app_timeout; |
fac6795d | 4749 | |
335a95b7 MD |
4750 | init_kernel_workarounds(); |
4751 | ||
f6a9efaa DG |
4752 | rcu_register_thread(); |
4753 | ||
0bb7724a DG |
4754 | if ((ret = set_signal_handler()) < 0) { |
4755 | goto error; | |
4756 | } | |
4757 | ||
7753dea8 | 4758 | setup_consumerd_path(); |
fb09408a | 4759 | |
12744796 DG |
4760 | page_size = sysconf(_SC_PAGESIZE); |
4761 | if (page_size < 0) { | |
4762 | PERROR("sysconf _SC_PAGESIZE"); | |
4763 | page_size = LONG_MAX; | |
4764 | WARN("Fallback page size to %ld", page_size); | |
4765 | } | |
4766 | ||
26296c48 | 4767 | /* Parse arguments and load the daemon configuration file */ |
fac6795d | 4768 | progname = argv[0]; |
26296c48 | 4769 | if ((ret = set_options(argc, argv)) < 0) { |
cf3af59e | 4770 | goto error; |
fac6795d DG |
4771 | } |
4772 | ||
4773 | /* Daemonize */ | |
72dd7491 | 4774 | if (opt_daemon || opt_background) { |
ceed52b5 MD |
4775 | int i; |
4776 | ||
72dd7491 MD |
4777 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
4778 | !opt_background); | |
53094c05 | 4779 | if (ret < 0) { |
cf3af59e | 4780 | goto error; |
53094c05 | 4781 | } |
0bb7724a | 4782 | |
ceed52b5 | 4783 | /* |
0bb7724a DG |
4784 | * We are in the child. Make sure all other file descriptors are |
4785 | * closed, in case we are called with more opened file descriptors than | |
4786 | * the standard ones. | |
ceed52b5 MD |
4787 | */ |
4788 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4789 | (void) close(i); | |
4790 | } | |
4791 | } | |
4792 | ||
4793 | /* Create thread quit pipe */ | |
4794 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4795 | goto error; | |
fac6795d DG |
4796 | } |
4797 | ||
4798 | /* Check if daemon is UID = 0 */ | |
4799 | is_root = !getuid(); | |
4800 | ||
fac6795d | 4801 | if (is_root) { |
990570ed | 4802 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4803 | |
4804 | /* Create global run dir with root access */ | |
4805 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4806 | if (ret < 0) { |
cf3af59e | 4807 | goto error; |
d6f42150 DG |
4808 | } |
4809 | ||
fac6795d | 4810 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4811 | snprintf(apps_unix_sock_path, PATH_MAX, |
4812 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4813 | } |
4814 | ||
4815 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4816 | snprintf(client_unix_sock_path, PATH_MAX, |
4817 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4818 | } | |
0fdd1e2c DG |
4819 | |
4820 | /* Set global SHM for ust */ | |
4821 | if (strlen(wait_shm_path) == 0) { | |
4822 | snprintf(wait_shm_path, PATH_MAX, | |
4823 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4824 | } | |
67e40797 | 4825 | |
44a5e5eb DG |
4826 | if (strlen(health_unix_sock_path) == 0) { |
4827 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4828 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4829 | } | |
4830 | ||
67e40797 DG |
4831 | /* Setup kernel consumerd path */ |
4832 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4833 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4834 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4835 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4836 | |
4837 | DBG2("Kernel consumer err path: %s", | |
4838 | kconsumer_data.err_unix_sock_path); | |
4839 | DBG2("Kernel consumer cmd path: %s", | |
4840 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4841 | } else { |
feb0f3e5 | 4842 | home_path = utils_get_home_dir(); |
b082db07 | 4843 | if (home_path == NULL) { |
273ea72c DG |
4844 | /* TODO: Add --socket PATH option */ |
4845 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4846 | ret = -EPERM; |
4847 | goto error; | |
b082db07 DG |
4848 | } |
4849 | ||
67e40797 DG |
4850 | /* |
4851 | * Create rundir from home path. This will create something like | |
4852 | * $HOME/.lttng | |
4853 | */ | |
990570ed | 4854 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4855 | if (ret < 0) { |
4856 | ret = -ENOMEM; | |
4857 | goto error; | |
4858 | } | |
4859 | ||
4860 | ret = create_lttng_rundir(rundir); | |
4861 | if (ret < 0) { | |
4862 | goto error; | |
4863 | } | |
4864 | ||
fac6795d | 4865 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4866 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4867 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4868 | } |
4869 | ||
4870 | /* Set the cli tool unix socket path */ | |
4871 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4872 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4873 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4874 | } |
0fdd1e2c DG |
4875 | |
4876 | /* Set global SHM for ust */ | |
4877 | if (strlen(wait_shm_path) == 0) { | |
4878 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4879 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4880 | } |
44a5e5eb DG |
4881 | |
4882 | /* Set health check Unix path */ | |
4883 | if (strlen(health_unix_sock_path) == 0) { | |
4884 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4885 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4886 | } | |
fac6795d DG |
4887 | } |
4888 | ||
5c827ce0 DG |
4889 | /* Set consumer initial state */ |
4890 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4891 | ust_consumerd_state = CONSUMER_STOPPED; | |
4892 | ||
847177cd DG |
4893 | DBG("Client socket path %s", client_unix_sock_path); |
4894 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4895 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4896 | DBG("LTTng run directory path: %s", rundir); |
4897 | ||
4898 | /* 32 bits consumerd path setup */ | |
4899 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4900 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4901 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4902 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4903 | |
4904 | DBG2("UST consumer 32 bits err path: %s", | |
4905 | ustconsumer32_data.err_unix_sock_path); | |
4906 | DBG2("UST consumer 32 bits cmd path: %s", | |
4907 | ustconsumer32_data.cmd_unix_sock_path); | |
4908 | ||
4909 | /* 64 bits consumerd path setup */ | |
4910 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4911 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4912 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4913 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4914 | |
4915 | DBG2("UST consumer 64 bits err path: %s", | |
4916 | ustconsumer64_data.err_unix_sock_path); | |
4917 | DBG2("UST consumer 64 bits cmd path: %s", | |
4918 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4919 | |
273ea72c | 4920 | /* |
7d8234d9 | 4921 | * See if daemon already exist. |
fac6795d | 4922 | */ |
7d8234d9 | 4923 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4924 | ERR("Already running daemon.\n"); |
273ea72c | 4925 | /* |
cf3af59e MD |
4926 | * We do not goto exit because we must not cleanup() |
4927 | * because a daemon is already running. | |
ab118b20 | 4928 | */ |
cf3af59e | 4929 | goto error; |
a88df331 DG |
4930 | } |
4931 | ||
1427f9b2 DG |
4932 | /* |
4933 | * Init UST app hash table. Alloc hash table before this point since | |
4934 | * cleanup() can get called after that point. | |
4935 | */ | |
4936 | ust_app_ht_alloc(); | |
4937 | ||
f20baf8e DG |
4938 | /* Initialize JUL domain subsystem. */ |
4939 | if ((ret = jul_init()) < 0) { | |
4940 | /* ENOMEM at this point. */ | |
4941 | goto error; | |
4942 | } | |
4943 | ||
54d01ffb | 4944 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4945 | |
4946 | /* | |
4947 | * These actions must be executed as root. We do that *after* setting up | |
4948 | * the sockets path because we MUST make the check for another daemon using | |
4949 | * those paths *before* trying to set the kernel consumer sockets and init | |
4950 | * kernel tracer. | |
4951 | */ | |
4952 | if (is_root) { | |
67e40797 | 4953 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4954 | if (ret < 0) { |
4955 | goto exit; | |
4956 | } | |
4957 | ||
a88df331 | 4958 | /* Setup kernel tracer */ |
4fba7219 DG |
4959 | if (!opt_no_kernel) { |
4960 | init_kernel_tracer(); | |
4961 | } | |
a88df331 DG |
4962 | |
4963 | /* Set ulimit for open files */ | |
4964 | set_ulimit(); | |
fac6795d | 4965 | } |
4063050c MD |
4966 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4967 | lttng_fd_init(); | |
fac6795d | 4968 | |
67e40797 DG |
4969 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4970 | if (ret < 0) { | |
4971 | goto exit; | |
4972 | } | |
4973 | ||
4974 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4975 | if (ret < 0) { | |
4976 | goto exit; | |
4977 | } | |
4978 | ||
d6f42150 | 4979 | /* Setup the needed unix socket */ |
cf3af59e MD |
4980 | if ((ret = init_daemon_socket()) < 0) { |
4981 | goto exit; | |
fac6795d DG |
4982 | } |
4983 | ||
4984 | /* Set credentials to socket */ | |
be040666 | 4985 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4986 | goto exit; |
fac6795d DG |
4987 | } |
4988 | ||
5b8719f5 DG |
4989 | /* Get parent pid if -S, --sig-parent is specified. */ |
4990 | if (opt_sig_parent) { | |
4991 | ppid = getppid(); | |
4992 | } | |
4993 | ||
7a485870 | 4994 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4995 | if (is_root && !opt_no_kernel) { |
4996 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4997 | goto exit; | |
4998 | } | |
7a485870 DG |
4999 | } |
5000 | ||
0b2dc8df MD |
5001 | /* Setup the thread ht_cleanup communication pipe. */ |
5002 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
5003 | goto exit; | |
5004 | } | |
5005 | ||
099e26bd | 5006 | /* Setup the thread apps communication pipe. */ |
ef599319 | 5007 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
5008 | goto exit; |
5009 | } | |
5010 | ||
d0b96690 DG |
5011 | /* Setup the thread apps notify communication pipe. */ |
5012 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
5013 | goto exit; | |
5014 | } | |
5015 | ||
7972aab2 DG |
5016 | /* Initialize global buffer per UID and PID registry. */ |
5017 | buffer_reg_init_uid_registry(); | |
5018 | buffer_reg_init_pid_registry(); | |
5019 | ||
099e26bd DG |
5020 | /* Init UST command queue. */ |
5021 | cds_wfq_init(&ust_cmd_queue.queue); | |
5022 | ||
273ea72c | 5023 | /* |
54d01ffb DG |
5024 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
5025 | * statically declared in session.c | |
273ea72c | 5026 | */ |
54d01ffb | 5027 | session_list_ptr = session_get_list(); |
b5541356 | 5028 | |
5eb91c98 DG |
5029 | /* Set up max poll set size */ |
5030 | lttng_poll_set_max_size(); | |
5031 | ||
2f77fc4b | 5032 | cmd_init(); |
00e2e675 | 5033 | |
ae9e45b3 DG |
5034 | /* Check for the application socket timeout env variable. */ |
5035 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5036 | if (env_app_timeout) { | |
5037 | app_socket_timeout = atoi(env_app_timeout); | |
5038 | } else { | |
5039 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
5040 | } | |
5041 | ||
35f90c40 | 5042 | write_pidfile(); |
cd9290dd | 5043 | write_julport(); |
35f90c40 | 5044 | |
554831e7 MD |
5045 | /* Initialize communication library */ |
5046 | lttcomm_init(); | |
d831c249 DG |
5047 | /* This is to get the TCP timeout value. */ |
5048 | lttcomm_inet_init(); | |
554831e7 | 5049 | |
67e05644 DG |
5050 | /* |
5051 | * Initialize the health check subsystem. This call should set the | |
5052 | * appropriate time values. | |
5053 | */ | |
6c71277b | 5054 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); |
8782cc74 MD |
5055 | if (!health_sessiond) { |
5056 | PERROR("health_app_create error"); | |
5057 | goto exit_health_sessiond_cleanup; | |
5058 | } | |
67e05644 | 5059 | |
d5b9fd2f | 5060 | /* Create thread to clean up RCU hash tables */ |
0b2dc8df MD |
5061 | ret = pthread_create(&ht_cleanup_thread, NULL, |
5062 | thread_ht_cleanup, (void *) NULL); | |
5063 | if (ret != 0) { | |
5064 | PERROR("pthread_create ht_cleanup"); | |
5065 | goto exit_ht_cleanup; | |
5066 | } | |
5067 | ||
d5b9fd2f | 5068 | /* Create health-check thread */ |
44a5e5eb DG |
5069 | ret = pthread_create(&health_thread, NULL, |
5070 | thread_manage_health, (void *) NULL); | |
5071 | if (ret != 0) { | |
5072 | PERROR("pthread_create health"); | |
5073 | goto exit_health; | |
5074 | } | |
5075 | ||
cf3af59e | 5076 | /* Create thread to manage the client socket */ |
099e26bd DG |
5077 | ret = pthread_create(&client_thread, NULL, |
5078 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 5079 | if (ret != 0) { |
76d7553f | 5080 | PERROR("pthread_create clients"); |
cf3af59e MD |
5081 | goto exit_client; |
5082 | } | |
fac6795d | 5083 | |
099e26bd DG |
5084 | /* Create thread to dispatch registration */ |
5085 | ret = pthread_create(&dispatch_thread, NULL, | |
5086 | thread_dispatch_ust_registration, (void *) NULL); | |
5087 | if (ret != 0) { | |
76d7553f | 5088 | PERROR("pthread_create dispatch"); |
099e26bd DG |
5089 | goto exit_dispatch; |
5090 | } | |
5091 | ||
5092 | /* Create thread to manage application registration. */ | |
5093 | ret = pthread_create(®_apps_thread, NULL, | |
5094 | thread_registration_apps, (void *) NULL); | |
5095 | if (ret != 0) { | |
76d7553f | 5096 | PERROR("pthread_create registration"); |
099e26bd DG |
5097 | goto exit_reg_apps; |
5098 | } | |
5099 | ||
cf3af59e | 5100 | /* Create thread to manage application socket */ |
54d01ffb DG |
5101 | ret = pthread_create(&apps_thread, NULL, |
5102 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 5103 | if (ret != 0) { |
d0b96690 DG |
5104 | PERROR("pthread_create apps"); |
5105 | goto exit_apps; | |
5106 | } | |
5107 | ||
5108 | /* Create thread to manage application notify socket */ | |
5109 | ret = pthread_create(&apps_notify_thread, NULL, | |
5110 | ust_thread_manage_notify, (void *) NULL); | |
5111 | if (ret != 0) { | |
76d7553f | 5112 | PERROR("pthread_create apps"); |
9563b0ad | 5113 | goto exit_apps_notify; |
cf3af59e | 5114 | } |
fac6795d | 5115 | |
4d076222 DG |
5116 | /* Create JUL registration thread. */ |
5117 | ret = pthread_create(&jul_reg_thread, NULL, | |
5118 | jul_thread_manage_registration, (void *) NULL); | |
5119 | if (ret != 0) { | |
5120 | PERROR("pthread_create apps"); | |
5121 | goto exit_jul_reg; | |
5122 | } | |
5123 | ||
6620da75 DG |
5124 | /* Don't start this thread if kernel tracing is not requested nor root */ |
5125 | if (is_root && !opt_no_kernel) { | |
5126 | /* Create kernel thread to manage kernel event */ | |
5127 | ret = pthread_create(&kernel_thread, NULL, | |
5128 | thread_manage_kernel, (void *) NULL); | |
5129 | if (ret != 0) { | |
5130 | PERROR("pthread_create kernel"); | |
5131 | goto exit_kernel; | |
5132 | } | |
7a485870 | 5133 | |
6620da75 DG |
5134 | ret = pthread_join(kernel_thread, &status); |
5135 | if (ret != 0) { | |
5136 | PERROR("pthread_join"); | |
5137 | goto error; /* join error, exit without cleanup */ | |
5138 | } | |
fac6795d DG |
5139 | } |
5140 | ||
cf3af59e | 5141 | exit_kernel: |
4d076222 DG |
5142 | ret = pthread_join(jul_reg_thread, &status); |
5143 | if (ret != 0) { | |
5144 | PERROR("pthread_join JUL"); | |
5145 | goto error; /* join error, exit without cleanup */ | |
5146 | } | |
5147 | ||
5148 | exit_jul_reg: | |
9563b0ad DG |
5149 | ret = pthread_join(apps_notify_thread, &status); |
5150 | if (ret != 0) { | |
5151 | PERROR("pthread_join apps notify"); | |
5152 | goto error; /* join error, exit without cleanup */ | |
5153 | } | |
5154 | ||
5155 | exit_apps_notify: | |
cf3af59e MD |
5156 | ret = pthread_join(apps_thread, &status); |
5157 | if (ret != 0) { | |
9563b0ad | 5158 | PERROR("pthread_join apps"); |
cf3af59e MD |
5159 | goto error; /* join error, exit without cleanup */ |
5160 | } | |
fac6795d | 5161 | |
4ccd8c8f | 5162 | |
cf3af59e | 5163 | exit_apps: |
099e26bd DG |
5164 | ret = pthread_join(reg_apps_thread, &status); |
5165 | if (ret != 0) { | |
76d7553f | 5166 | PERROR("pthread_join"); |
099e26bd DG |
5167 | goto error; /* join error, exit without cleanup */ |
5168 | } | |
5169 | ||
5170 | exit_reg_apps: | |
5171 | ret = pthread_join(dispatch_thread, &status); | |
5172 | if (ret != 0) { | |
76d7553f | 5173 | PERROR("pthread_join"); |
099e26bd DG |
5174 | goto error; /* join error, exit without cleanup */ |
5175 | } | |
5176 | ||
5177 | exit_dispatch: | |
cf3af59e MD |
5178 | ret = pthread_join(client_thread, &status); |
5179 | if (ret != 0) { | |
76d7553f | 5180 | PERROR("pthread_join"); |
cf3af59e MD |
5181 | goto error; /* join error, exit without cleanup */ |
5182 | } | |
5183 | ||
3bd1e081 | 5184 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 5185 | if (ret != 0) { |
76d7553f | 5186 | PERROR("join_consumer"); |
cf3af59e MD |
5187 | goto error; /* join error, exit without cleanup */ |
5188 | } | |
a88df331 | 5189 | |
06f525de DG |
5190 | ret = join_consumer_thread(&ustconsumer32_data); |
5191 | if (ret != 0) { | |
5192 | PERROR("join_consumer ust32"); | |
5193 | goto error; /* join error, exit without cleanup */ | |
5194 | } | |
5195 | ||
5196 | ret = join_consumer_thread(&ustconsumer64_data); | |
5197 | if (ret != 0) { | |
5198 | PERROR("join_consumer ust64"); | |
5199 | goto error; /* join error, exit without cleanup */ | |
5200 | } | |
5201 | ||
cf3af59e | 5202 | exit_client: |
06f525de DG |
5203 | ret = pthread_join(health_thread, &status); |
5204 | if (ret != 0) { | |
5205 | PERROR("pthread_join health thread"); | |
5206 | goto error; /* join error, exit without cleanup */ | |
5207 | } | |
5208 | ||
44a5e5eb | 5209 | exit_health: |
0b2dc8df MD |
5210 | ret = pthread_join(ht_cleanup_thread, &status); |
5211 | if (ret != 0) { | |
5212 | PERROR("pthread_join ht cleanup thread"); | |
5213 | goto error; /* join error, exit without cleanup */ | |
5214 | } | |
5215 | exit_ht_cleanup: | |
8782cc74 MD |
5216 | health_app_destroy(health_sessiond); |
5217 | exit_health_sessiond_cleanup: | |
a88df331 | 5218 | exit: |
cf3af59e MD |
5219 | /* |
5220 | * cleanup() is called when no other thread is running. | |
5221 | */ | |
f6a9efaa | 5222 | rcu_thread_online(); |
cf3af59e | 5223 | cleanup(); |
f6a9efaa DG |
5224 | rcu_thread_offline(); |
5225 | rcu_unregister_thread(); | |
67e40797 | 5226 | if (!ret) { |
cf3af59e | 5227 | exit(EXIT_SUCCESS); |
67e40797 | 5228 | } |
cf3af59e | 5229 | error: |
5e16da05 | 5230 | exit(EXIT_FAILURE); |
fac6795d | 5231 | } |