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> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
331744e3 | 28 | #include <inttypes.h> |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.h> |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
7972aab2 | 49 | #include "buffer-registry.h" |
54d01ffb | 50 | #include "channel.h" |
2f77fc4b | 51 | #include "cmd.h" |
00e2e675 | 52 | #include "consumer.h" |
099e26bd | 53 | #include "context.h" |
54d01ffb | 54 | #include "event.h" |
4771f025 | 55 | #include "kernel.h" |
f1e16794 | 56 | #include "kernel-consumer.h" |
096102bd | 57 | #include "modprobe.h" |
0fdd1e2c | 58 | #include "shm.h" |
1e307fab | 59 | #include "ust-ctl.h" |
00e2e675 | 60 | #include "ust-consumer.h" |
8e68d1c8 | 61 | #include "utils.h" |
4063050c | 62 | #include "fd-limit.h" |
44a5e5eb | 63 | #include "health.h" |
8ac94142 | 64 | #include "testpoint.h" |
d0b96690 | 65 | #include "ust-thread.h" |
fac6795d | 66 | |
ebaeda94 MD |
67 | #define CONSUMERD_FILE "lttng-consumerd" |
68 | ||
75462a81 | 69 | /* Const values */ |
bbccc3d2 | 70 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab | 71 | |
fac6795d DG |
72 | const char *progname; |
73 | const char *opt_tracing_group; | |
35f90c40 | 74 | static const char *opt_pidfile; |
5b8719f5 | 75 | static int opt_sig_parent; |
97e19046 | 76 | static int opt_verbose_consumer; |
fac6795d | 77 | static int opt_daemon; |
4fba7219 | 78 | static int opt_no_kernel; |
fac6795d | 79 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 80 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 81 | static char *rundir; |
3bd1e081 | 82 | |
a23ec3a7 DG |
83 | /* |
84 | * Consumer daemon specific control data. Every value not initialized here is | |
85 | * set to 0 by the static definition. | |
86 | */ | |
3bd1e081 MD |
87 | static struct consumer_data kconsumer_data = { |
88 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
89 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
90 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
91 | .err_sock = -1, |
92 | .cmd_sock = -1, | |
331744e3 | 93 | .metadata_sock.fd = -1, |
173af62f DG |
94 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
95 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
96 | .cond = PTHREAD_COND_INITIALIZER, |
97 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 98 | }; |
7753dea8 MD |
99 | static struct consumer_data ustconsumer64_data = { |
100 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
103 | .err_sock = -1, |
104 | .cmd_sock = -1, | |
331744e3 | 105 | .metadata_sock.fd = -1, |
173af62f DG |
106 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
107 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
108 | .cond = PTHREAD_COND_INITIALIZER, |
109 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
110 | }; |
111 | static struct consumer_data ustconsumer32_data = { | |
112 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
113 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
114 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
115 | .err_sock = -1, |
116 | .cmd_sock = -1, | |
331744e3 | 117 | .metadata_sock.fd = -1, |
173af62f DG |
118 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
119 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
120 | .cond = PTHREAD_COND_INITIALIZER, |
121 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
122 | }; |
123 | ||
26c9d55e | 124 | /* Shared between threads */ |
099e26bd | 125 | static int dispatch_thread_exit; |
fac6795d | 126 | |
54d01ffb DG |
127 | /* Global application Unix socket path */ |
128 | static char apps_unix_sock_path[PATH_MAX]; | |
129 | /* Global client Unix socket path */ | |
130 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
131 | /* global wait shm path for UST */ |
132 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
133 | /* Global health check unix path */ |
134 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 135 | |
1d4b027a | 136 | /* Sockets and FDs */ |
a4b35e07 MD |
137 | static int client_sock = -1; |
138 | static int apps_sock = -1; | |
2f77fc4b | 139 | int kernel_tracer_fd = -1; |
76d7553f | 140 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 141 | |
273ea72c DG |
142 | /* |
143 | * Quit pipe for all threads. This permits a single cancellation point | |
144 | * for all threads when receiving an event on the pipe. | |
145 | */ | |
76d7553f | 146 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 147 | |
099e26bd DG |
148 | /* |
149 | * This pipe is used to inform the thread managing application communication | |
150 | * that a command is queued and ready to be processed. | |
151 | */ | |
76d7553f | 152 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 153 | |
d0b96690 DG |
154 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
155 | ||
1d4b027a | 156 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 157 | static pthread_t apps_thread; |
d0b96690 | 158 | static pthread_t apps_notify_thread; |
099e26bd | 159 | static pthread_t reg_apps_thread; |
1d4b027a | 160 | static pthread_t client_thread; |
7a485870 | 161 | static pthread_t kernel_thread; |
099e26bd | 162 | static pthread_t dispatch_thread; |
44a5e5eb | 163 | static pthread_t health_thread; |
0b2dc8df | 164 | static pthread_t ht_cleanup_thread; |
5eb91c98 | 165 | |
099e26bd DG |
166 | /* |
167 | * UST registration command queue. This queue is tied with a futex and uses a N | |
168 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
169 | * | |
170 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
171 | * this queue and the wait/wake scheme. | |
172 | */ | |
173 | static struct ust_cmd_queue ust_cmd_queue; | |
174 | ||
b5541356 DG |
175 | /* |
176 | * Pointer initialized before thread creation. | |
177 | * | |
178 | * This points to the tracing session list containing the session count and a | |
179 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
180 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 181 | * |
d063d709 | 182 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 183 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
184 | */ |
185 | static struct ltt_session_list *session_list_ptr; | |
186 | ||
7753dea8 MD |
187 | int ust_consumerd64_fd = -1; |
188 | int ust_consumerd32_fd = -1; | |
189 | ||
fb6f1fa2 YB |
190 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
191 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
192 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
193 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 194 | |
2f77fc4b DG |
195 | static const char *module_proc_lttng = "/proc/lttng"; |
196 | ||
5c827ce0 DG |
197 | /* |
198 | * Consumer daemon state which is changed when spawning it, killing it or in | |
199 | * case of a fatal error. | |
200 | */ | |
201 | enum consumerd_state { | |
202 | CONSUMER_STARTED = 1, | |
203 | CONSUMER_STOPPED = 2, | |
204 | CONSUMER_ERROR = 3, | |
205 | }; | |
206 | ||
207 | /* | |
208 | * This consumer daemon state is used to validate if a client command will be | |
209 | * able to reach the consumer. If not, the client is informed. For instance, | |
210 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
211 | * error to the client. | |
212 | * | |
213 | * The following example shows a possible race condition of this scheme: | |
214 | * | |
215 | * consumer thread error happens | |
216 | * client cmd arrives | |
217 | * client cmd checks state -> still OK | |
218 | * consumer thread exit, sets error | |
219 | * client cmd try to talk to consumer | |
220 | * ... | |
221 | * | |
222 | * However, since the consumer is a different daemon, we have no way of making | |
223 | * sure the command will reach it safely even with this state flag. This is why | |
224 | * we consider that up to the state validation during command processing, the | |
225 | * command is safe. After that, we can not guarantee the correctness of the | |
226 | * client request vis-a-vis the consumer. | |
227 | */ | |
228 | static enum consumerd_state ust_consumerd_state; | |
229 | static enum consumerd_state kernel_consumerd_state; | |
230 | ||
ae9e45b3 DG |
231 | /* |
232 | * Socket timeout for receiving and sending in seconds. | |
233 | */ | |
234 | static int app_socket_timeout; | |
235 | ||
12744796 DG |
236 | /* Set in main() with the current page size. */ |
237 | long page_size; | |
238 | ||
fb09408a | 239 | static |
7753dea8 | 240 | void setup_consumerd_path(void) |
fb09408a | 241 | { |
fc7a59ce | 242 | const char *bin, *libdir; |
fb09408a | 243 | |
7753dea8 MD |
244 | /* |
245 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
246 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
247 | * has not been defined. | |
7753dea8 | 248 | */ |
ebaeda94 | 249 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
250 | if (!consumerd32_bin[0]) { |
251 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
252 | } |
253 | if (!consumerd32_libdir[0]) { | |
254 | consumerd32_libdir = INSTALL_LIB_PATH; | |
255 | } | |
256 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
257 | if (!consumerd64_bin[0]) { |
258 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 259 | } |
ebaeda94 MD |
260 | if (!consumerd64_libdir[0]) { |
261 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
262 | } |
263 | #else | |
264 | #error "Unknown bitness" | |
265 | #endif | |
266 | ||
fb09408a MD |
267 | /* |
268 | * runtime env. var. overrides the build default. | |
269 | */ | |
fc7a59ce AM |
270 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
271 | if (bin) { | |
272 | consumerd32_bin = bin; | |
7753dea8 | 273 | } |
fc7a59ce AM |
274 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
275 | if (bin) { | |
276 | consumerd64_bin = bin; | |
ebaeda94 | 277 | } |
72f579ee | 278 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
279 | if (libdir) { |
280 | consumerd32_libdir = libdir; | |
281 | } | |
72f579ee | 282 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
283 | if (libdir) { |
284 | consumerd64_libdir = libdir; | |
fb09408a MD |
285 | } |
286 | } | |
287 | ||
5eb91c98 DG |
288 | /* |
289 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
290 | */ | |
d0b96690 | 291 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
292 | { |
293 | int ret; | |
294 | ||
d0b96690 | 295 | assert(events); |
5eb91c98 DG |
296 | |
297 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
298 | if (ret < 0) { | |
299 | goto error; | |
300 | } | |
301 | ||
302 | /* Add quit pipe */ | |
d0b96690 | 303 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
304 | if (ret < 0) { |
305 | goto error; | |
306 | } | |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check if the thread quit pipe was triggered. | |
316 | * | |
317 | * Return 1 if it was triggered else 0; | |
318 | */ | |
d0b96690 | 319 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
320 | { |
321 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
322 | return 1; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
0fdd1e2c DG |
328 | /* |
329 | * Return group ID of the tracing group or -1 if not found. | |
330 | */ | |
996b65c8 MD |
331 | static gid_t allowed_group(void) |
332 | { | |
333 | struct group *grp; | |
334 | ||
274e143b MD |
335 | if (opt_tracing_group) { |
336 | grp = getgrnam(opt_tracing_group); | |
337 | } else { | |
338 | grp = getgrnam(default_tracing_group); | |
339 | } | |
996b65c8 MD |
340 | if (!grp) { |
341 | return -1; | |
342 | } else { | |
343 | return grp->gr_gid; | |
344 | } | |
345 | } | |
346 | ||
273ea72c | 347 | /* |
5eb91c98 | 348 | * Init thread quit pipe. |
273ea72c DG |
349 | * |
350 | * Return -1 on error or 0 if all pipes are created. | |
351 | */ | |
352 | static int init_thread_quit_pipe(void) | |
353 | { | |
730389d9 | 354 | int ret, i; |
273ea72c | 355 | |
730389d9 | 356 | ret = pipe(thread_quit_pipe); |
273ea72c | 357 | if (ret < 0) { |
730389d9 | 358 | PERROR("thread quit pipe"); |
273ea72c DG |
359 | goto error; |
360 | } | |
361 | ||
730389d9 DG |
362 | for (i = 0; i < 2; i++) { |
363 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
364 | if (ret < 0) { | |
365 | PERROR("fcntl"); | |
366 | goto error; | |
367 | } | |
368 | } | |
369 | ||
273ea72c DG |
370 | error: |
371 | return ret; | |
372 | } | |
373 | ||
099e26bd DG |
374 | /* |
375 | * Stop all threads by closing the thread quit pipe. | |
376 | */ | |
cf3af59e MD |
377 | static void stop_threads(void) |
378 | { | |
5eb91c98 DG |
379 | int ret; |
380 | ||
cf3af59e MD |
381 | /* Stopping all threads */ |
382 | DBG("Terminating all threads"); | |
54d01ffb | 383 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
384 | if (ret < 0) { |
385 | ERR("write error on thread quit pipe"); | |
386 | } | |
387 | ||
099e26bd | 388 | /* Dispatch thread */ |
26c9d55e | 389 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 390 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
391 | } |
392 | ||
fac6795d | 393 | /* |
d063d709 | 394 | * Cleanup the daemon |
fac6795d | 395 | */ |
cf3af59e | 396 | static void cleanup(void) |
fac6795d | 397 | { |
ef599319 | 398 | int ret; |
6620da75 | 399 | char *cmd = NULL; |
af9737e9 | 400 | struct ltt_session *sess, *stmp; |
fac6795d | 401 | |
1d4b027a | 402 | DBG("Cleaning up"); |
e07ae692 | 403 | |
2f77fc4b DG |
404 | /* First thing first, stop all threads */ |
405 | utils_close_pipe(thread_quit_pipe); | |
406 | ||
35f90c40 DG |
407 | /* |
408 | * If opt_pidfile is undefined, the default file will be wiped when | |
409 | * removing the rundir. | |
410 | */ | |
411 | if (opt_pidfile) { | |
412 | ret = remove(opt_pidfile); | |
413 | if (ret < 0) { | |
414 | PERROR("remove pidfile %s", opt_pidfile); | |
415 | } | |
416 | } | |
417 | ||
67e40797 DG |
418 | DBG("Removing %s directory", rundir); |
419 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
420 | if (ret < 0) { | |
421 | ERR("asprintf failed. Something is really wrong!"); | |
422 | } | |
5461b305 | 423 | |
67e40797 DG |
424 | /* Remove lttng run directory */ |
425 | ret = system(cmd); | |
426 | if (ret < 0) { | |
427 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 428 | } |
67e40797 | 429 | free(cmd); |
bd69add2 | 430 | free(rundir); |
5461b305 | 431 | |
99bab54f | 432 | DBG("Cleaning up all sessions"); |
fac6795d | 433 | |
b5541356 | 434 | /* Destroy session list mutex */ |
273ea72c DG |
435 | if (session_list_ptr != NULL) { |
436 | pthread_mutex_destroy(&session_list_ptr->lock); | |
437 | ||
438 | /* Cleanup ALL session */ | |
54d01ffb DG |
439 | cds_list_for_each_entry_safe(sess, stmp, |
440 | &session_list_ptr->head, list) { | |
2f77fc4b | 441 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
442 | } |
443 | } | |
444 | ||
099e26bd | 445 | DBG("Closing all UST sockets"); |
56fff090 | 446 | ust_app_clean_list(); |
7972aab2 | 447 | buffer_reg_destroy_registries(); |
099e26bd | 448 | |
4fba7219 DG |
449 | if (is_root && !opt_no_kernel) { |
450 | DBG2("Closing kernel fd"); | |
a4b35e07 | 451 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
452 | ret = close(kernel_tracer_fd); |
453 | if (ret) { | |
454 | PERROR("close"); | |
455 | } | |
a4b35e07 | 456 | } |
2f50c8a3 | 457 | DBG("Unloading kernel modules"); |
096102bd | 458 | modprobe_remove_lttng_all(); |
2f50c8a3 | 459 | } |
2f77fc4b | 460 | |
421cb601 | 461 | /* <fun> */ |
f56a39af | 462 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
463 | "Matthew, BEET driven development works!%c[%dm", |
464 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
465 | /* </fun> */ | |
fac6795d DG |
466 | } |
467 | ||
e065084a | 468 | /* |
d063d709 | 469 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 470 | * |
d063d709 | 471 | * Return lttcomm error code. |
e065084a DG |
472 | */ |
473 | static int send_unix_sock(int sock, void *buf, size_t len) | |
474 | { | |
475 | /* Check valid length */ | |
c617c0c6 | 476 | if (len == 0) { |
e065084a DG |
477 | return -1; |
478 | } | |
479 | ||
480 | return lttcomm_send_unix_sock(sock, buf, len); | |
481 | } | |
482 | ||
5461b305 | 483 | /* |
d063d709 | 484 | * Free memory of a command context structure. |
5461b305 | 485 | */ |
a2fb29a5 | 486 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 487 | { |
a2fb29a5 DG |
488 | DBG("Clean command context structure"); |
489 | if (*cmd_ctx) { | |
490 | if ((*cmd_ctx)->llm) { | |
491 | free((*cmd_ctx)->llm); | |
5461b305 | 492 | } |
a2fb29a5 DG |
493 | if ((*cmd_ctx)->lsm) { |
494 | free((*cmd_ctx)->lsm); | |
5461b305 | 495 | } |
a2fb29a5 DG |
496 | free(*cmd_ctx); |
497 | *cmd_ctx = NULL; | |
5461b305 DG |
498 | } |
499 | } | |
500 | ||
fac6795d | 501 | /* |
0fdd1e2c | 502 | * Notify UST applications using the shm mmap futex. |
fac6795d | 503 | */ |
0fdd1e2c | 504 | static int notify_ust_apps(int active) |
fac6795d | 505 | { |
0fdd1e2c | 506 | char *wait_shm_mmap; |
fac6795d | 507 | |
0fdd1e2c | 508 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 509 | |
0fdd1e2c DG |
510 | /* See shm.c for this call implying mmap, shm and futex calls */ |
511 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
512 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
513 | goto error; |
514 | } | |
515 | ||
0fdd1e2c DG |
516 | /* Wake waiting process */ |
517 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
518 | ||
519 | /* Apps notified successfully */ | |
520 | return 0; | |
fac6795d DG |
521 | |
522 | error: | |
0fdd1e2c | 523 | return -1; |
fac6795d DG |
524 | } |
525 | ||
e065084a | 526 | /* |
d063d709 DG |
527 | * Setup the outgoing data buffer for the response (llm) by allocating the |
528 | * right amount of memory and copying the original information from the lsm | |
529 | * structure. | |
ca95a216 | 530 | * |
d063d709 | 531 | * Return total size of the buffer pointed by buf. |
ca95a216 | 532 | */ |
5461b305 | 533 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 534 | { |
f3ed775e | 535 | int ret, buf_size; |
ca95a216 | 536 | |
f3ed775e | 537 | buf_size = size; |
5461b305 | 538 | |
ba7f0ae5 | 539 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 540 | if (cmd_ctx->llm == NULL) { |
76d7553f | 541 | PERROR("zmalloc"); |
5461b305 | 542 | ret = -ENOMEM; |
ca95a216 DG |
543 | goto error; |
544 | } | |
545 | ||
5461b305 DG |
546 | /* Copy common data */ |
547 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 548 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 549 | |
5461b305 DG |
550 | cmd_ctx->llm->data_size = size; |
551 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
552 | ||
ca95a216 DG |
553 | return buf_size; |
554 | ||
555 | error: | |
556 | return ret; | |
557 | } | |
558 | ||
7a485870 | 559 | /* |
5eb91c98 | 560 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 561 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 562 | */ |
5eb91c98 | 563 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 564 | { |
5eb91c98 | 565 | int ret; |
7a485870 DG |
566 | struct ltt_session *session; |
567 | struct ltt_kernel_channel *channel; | |
568 | ||
5eb91c98 | 569 | DBG("Updating kernel poll set"); |
7a485870 | 570 | |
54d01ffb | 571 | session_lock_list(); |
b5541356 | 572 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 573 | session_lock(session); |
7a485870 | 574 | if (session->kernel_session == NULL) { |
54d01ffb | 575 | session_unlock(session); |
7a485870 DG |
576 | continue; |
577 | } | |
7a485870 | 578 | |
54d01ffb DG |
579 | cds_list_for_each_entry(channel, |
580 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
581 | /* Add channel fd to the kernel poll set */ |
582 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
583 | if (ret < 0) { | |
54d01ffb | 584 | session_unlock(session); |
5eb91c98 DG |
585 | goto error; |
586 | } | |
587 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 588 | } |
54d01ffb | 589 | session_unlock(session); |
7a485870 | 590 | } |
54d01ffb | 591 | session_unlock_list(); |
7a485870 | 592 | |
5eb91c98 | 593 | return 0; |
7a485870 DG |
594 | |
595 | error: | |
54d01ffb | 596 | session_unlock_list(); |
7a485870 DG |
597 | return -1; |
598 | } | |
599 | ||
600 | /* | |
54d01ffb | 601 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 602 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 603 | * |
d063d709 | 604 | * Useful for CPU hotplug feature. |
7a485870 | 605 | */ |
2bdd86d4 | 606 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
607 | { |
608 | int ret = 0; | |
609 | struct ltt_session *session; | |
173af62f | 610 | struct ltt_kernel_session *ksess; |
7a485870 DG |
611 | struct ltt_kernel_channel *channel; |
612 | ||
613 | DBG("Updating kernel streams for channel fd %d", fd); | |
614 | ||
54d01ffb | 615 | session_lock_list(); |
b5541356 | 616 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 617 | session_lock(session); |
7a485870 | 618 | if (session->kernel_session == NULL) { |
54d01ffb | 619 | session_unlock(session); |
7a485870 DG |
620 | continue; |
621 | } | |
173af62f | 622 | ksess = session->kernel_session; |
d9800920 | 623 | |
173af62f | 624 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
625 | if (channel->fd == fd) { |
626 | DBG("Channel found, updating kernel streams"); | |
627 | ret = kernel_open_channel_stream(channel); | |
628 | if (ret < 0) { | |
b3c750d2 | 629 | goto error; |
7a485870 | 630 | } |
d9800920 | 631 | |
7a485870 | 632 | /* |
5eb91c98 DG |
633 | * Have we already sent fds to the consumer? If yes, it means |
634 | * that tracing is started so it is safe to send our updated | |
635 | * stream fds. | |
7a485870 | 636 | */ |
173af62f DG |
637 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
638 | struct lttng_ht_iter iter; | |
639 | struct consumer_socket *socket; | |
640 | ||
e7fe706f | 641 | rcu_read_lock(); |
173af62f DG |
642 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
643 | &iter.iter, socket, node.node) { | |
644 | /* Code flow error */ | |
645 | assert(socket->fd >= 0); | |
646 | ||
647 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 648 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
649 | channel, ksess, |
650 | session->output_traces ? 1 : 0); | |
173af62f DG |
651 | pthread_mutex_unlock(socket->lock); |
652 | if (ret < 0) { | |
e7fe706f | 653 | rcu_read_unlock(); |
173af62f DG |
654 | goto error; |
655 | } | |
7a485870 | 656 | } |
e7fe706f | 657 | rcu_read_unlock(); |
7a485870 | 658 | } |
b3c750d2 | 659 | goto error; |
7a485870 DG |
660 | } |
661 | } | |
54d01ffb | 662 | session_unlock(session); |
7a485870 | 663 | } |
54d01ffb | 664 | session_unlock_list(); |
b3c750d2 | 665 | return ret; |
7a485870 | 666 | |
b3c750d2 | 667 | error: |
54d01ffb DG |
668 | session_unlock(session); |
669 | session_unlock_list(); | |
7a485870 DG |
670 | return ret; |
671 | } | |
672 | ||
487cf67c | 673 | /* |
ffe60014 DG |
674 | * For each tracing session, update newly registered apps. The session list |
675 | * lock MUST be acquired before calling this. | |
487cf67c DG |
676 | */ |
677 | static void update_ust_app(int app_sock) | |
678 | { | |
679 | struct ltt_session *sess, *stmp; | |
680 | ||
681 | /* For all tracing session(s) */ | |
682 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 683 | session_lock(sess); |
421cb601 DG |
684 | if (sess->ust_session) { |
685 | ust_app_global_update(sess->ust_session, app_sock); | |
686 | } | |
4ee14516 | 687 | session_unlock(sess); |
487cf67c DG |
688 | } |
689 | } | |
690 | ||
7a485870 | 691 | /* |
d063d709 | 692 | * This thread manage event coming from the kernel. |
7a485870 | 693 | * |
d063d709 DG |
694 | * Features supported in this thread: |
695 | * -) CPU Hotplug | |
7a485870 DG |
696 | */ |
697 | static void *thread_manage_kernel(void *data) | |
698 | { | |
139ac872 | 699 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 700 | uint32_t revents, nb_fd; |
7a485870 | 701 | char tmp; |
5eb91c98 | 702 | struct lttng_poll_event events; |
7a485870 | 703 | |
6993eeb3 | 704 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 705 | |
927ca06a DG |
706 | health_register(HEALTH_TYPE_KERNEL); |
707 | ||
d5d63bf1 DG |
708 | /* |
709 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 710 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 711 | */ |
6d737ce4 | 712 | lttng_poll_init(&events); |
d5d63bf1 | 713 | |
6993eeb3 CB |
714 | if (testpoint(thread_manage_kernel)) { |
715 | goto error_testpoint; | |
716 | } | |
8ac94142 | 717 | |
840cb59c | 718 | health_code_update(); |
44a5e5eb | 719 | |
6993eeb3 | 720 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 721 | goto error_testpoint; |
6993eeb3 CB |
722 | } |
723 | ||
7a485870 | 724 | while (1) { |
840cb59c | 725 | health_code_update(); |
44a5e5eb | 726 | |
7a485870 | 727 | if (update_poll_flag == 1) { |
d21b0d71 DG |
728 | /* Clean events object. We are about to populate it again. */ |
729 | lttng_poll_clean(&events); | |
730 | ||
d0b96690 | 731 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
732 | if (ret < 0) { |
733 | goto error_poll_create; | |
734 | } | |
735 | ||
736 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
737 | if (ret < 0) { | |
738 | goto error; | |
739 | } | |
5f822d0a | 740 | |
d21b0d71 | 741 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
742 | ret = update_kernel_poll(&events); |
743 | if (ret < 0) { | |
7a485870 DG |
744 | goto error; |
745 | } | |
746 | update_poll_flag = 0; | |
747 | } | |
748 | ||
d21b0d71 | 749 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
750 | |
751 | /* Poll infinite value of time */ | |
88f2b785 | 752 | restart: |
a78af745 | 753 | health_poll_entry(); |
5eb91c98 | 754 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 755 | health_poll_exit(); |
7a485870 | 756 | if (ret < 0) { |
88f2b785 MD |
757 | /* |
758 | * Restart interrupted system call. | |
759 | */ | |
760 | if (errno == EINTR) { | |
761 | goto restart; | |
762 | } | |
7a485870 DG |
763 | goto error; |
764 | } else if (ret == 0) { | |
765 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
766 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
767 | "This should not have happened! Continuing..."); | |
7a485870 DG |
768 | continue; |
769 | } | |
770 | ||
0d9c5d77 DG |
771 | nb_fd = ret; |
772 | ||
5eb91c98 DG |
773 | for (i = 0; i < nb_fd; i++) { |
774 | /* Fetch once the poll data */ | |
775 | revents = LTTNG_POLL_GETEV(&events, i); | |
776 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 777 | |
840cb59c | 778 | health_code_update(); |
44a5e5eb | 779 | |
5eb91c98 | 780 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 781 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 782 | if (ret) { |
139ac872 MD |
783 | err = 0; |
784 | goto exit; | |
5eb91c98 | 785 | } |
7a485870 | 786 | |
5eb91c98 DG |
787 | /* Check for data on kernel pipe */ |
788 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
789 | do { |
790 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
791 | } while (ret < 0 && errno == EINTR); | |
792 | /* | |
793 | * Ret value is useless here, if this pipe gets any actions an | |
794 | * update is required anyway. | |
795 | */ | |
5eb91c98 DG |
796 | update_poll_flag = 1; |
797 | continue; | |
798 | } else { | |
799 | /* | |
800 | * New CPU detected by the kernel. Adding kernel stream to | |
801 | * kernel session and updating the kernel consumer | |
802 | */ | |
803 | if (revents & LPOLLIN) { | |
2bdd86d4 | 804 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
805 | if (ret < 0) { |
806 | continue; | |
807 | } | |
808 | break; | |
809 | /* | |
810 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
811 | * and unregister kernel stream at this point. | |
812 | */ | |
7a485870 | 813 | } |
7a485870 DG |
814 | } |
815 | } | |
816 | } | |
817 | ||
139ac872 | 818 | exit: |
7a485870 | 819 | error: |
5eb91c98 | 820 | lttng_poll_clean(&events); |
76d7553f | 821 | error_poll_create: |
6993eeb3 | 822 | error_testpoint: |
6620da75 DG |
823 | utils_close_pipe(kernel_poll_pipe); |
824 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 825 | if (err) { |
840cb59c | 826 | health_error(); |
139ac872 | 827 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
828 | WARN("Kernel thread died unexpectedly. " |
829 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 830 | } |
927ca06a | 831 | health_unregister(); |
76d7553f | 832 | DBG("Kernel thread dying"); |
7a485870 DG |
833 | return NULL; |
834 | } | |
835 | ||
a23ec3a7 DG |
836 | /* |
837 | * Signal pthread condition of the consumer data that the thread. | |
838 | */ | |
839 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
840 | { | |
841 | pthread_mutex_lock(&data->cond_mutex); | |
842 | ||
843 | /* | |
844 | * The state is set before signaling. It can be any value, it's the waiter | |
845 | * job to correctly interpret this condition variable associated to the | |
846 | * consumer pthread_cond. | |
847 | * | |
848 | * A value of 0 means that the corresponding thread of the consumer data | |
849 | * was not started. 1 indicates that the thread has started and is ready | |
850 | * for action. A negative value means that there was an error during the | |
851 | * thread bootstrap. | |
852 | */ | |
853 | data->consumer_thread_is_ready = state; | |
854 | (void) pthread_cond_signal(&data->cond); | |
855 | ||
856 | pthread_mutex_unlock(&data->cond_mutex); | |
857 | } | |
858 | ||
1d4b027a | 859 | /* |
3bd1e081 | 860 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 861 | */ |
3bd1e081 | 862 | static void *thread_manage_consumer(void *data) |
1d4b027a | 863 | { |
139ac872 | 864 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 865 | uint32_t revents, nb_fd; |
1d4b027a | 866 | enum lttcomm_return_code code; |
5eb91c98 | 867 | struct lttng_poll_event events; |
3bd1e081 | 868 | struct consumer_data *consumer_data = data; |
1d4b027a | 869 | |
3bd1e081 | 870 | DBG("[thread] Manage consumer started"); |
1d4b027a | 871 | |
927ca06a DG |
872 | health_register(HEALTH_TYPE_CONSUMER); |
873 | ||
855060f8 | 874 | health_code_update(); |
9449cc75 | 875 | |
5eb91c98 | 876 | /* |
331744e3 JD |
877 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
878 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 879 | */ |
331744e3 | 880 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 881 | if (ret < 0) { |
76d7553f | 882 | goto error_poll; |
5eb91c98 | 883 | } |
273ea72c | 884 | |
edb8b045 DG |
885 | /* |
886 | * The error socket here is already in a listening state which was done | |
887 | * just before spawning this thread to avoid a race between the consumer | |
888 | * daemon exec trying to connect and the listen() call. | |
889 | */ | |
3bd1e081 | 890 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
891 | if (ret < 0) { |
892 | goto error; | |
893 | } | |
894 | ||
840cb59c | 895 | health_code_update(); |
44a5e5eb | 896 | |
331744e3 | 897 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 898 | restart: |
a78af745 | 899 | health_poll_entry(); |
8ac94142 | 900 | |
6993eeb3 CB |
901 | if (testpoint(thread_manage_consumer)) { |
902 | goto error; | |
903 | } | |
8ac94142 | 904 | |
5eb91c98 | 905 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 906 | health_poll_exit(); |
273ea72c | 907 | if (ret < 0) { |
88f2b785 MD |
908 | /* |
909 | * Restart interrupted system call. | |
910 | */ | |
911 | if (errno == EINTR) { | |
912 | goto restart; | |
913 | } | |
273ea72c DG |
914 | goto error; |
915 | } | |
916 | ||
0d9c5d77 DG |
917 | nb_fd = ret; |
918 | ||
5eb91c98 DG |
919 | for (i = 0; i < nb_fd; i++) { |
920 | /* Fetch once the poll data */ | |
921 | revents = LTTNG_POLL_GETEV(&events, i); | |
922 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
923 | ||
840cb59c | 924 | health_code_update(); |
44a5e5eb | 925 | |
5eb91c98 | 926 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 927 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 928 | if (ret) { |
139ac872 MD |
929 | err = 0; |
930 | goto exit; | |
5eb91c98 DG |
931 | } |
932 | ||
933 | /* Event on the registration socket */ | |
3bd1e081 | 934 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 935 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 936 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
937 | goto error; |
938 | } | |
939 | } | |
273ea72c DG |
940 | } |
941 | ||
3bd1e081 | 942 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
943 | if (sock < 0) { |
944 | goto error; | |
945 | } | |
946 | ||
b662582b DG |
947 | /* |
948 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
949 | * show must go on. | |
950 | */ | |
951 | (void) utils_set_fd_cloexec(sock); | |
952 | ||
840cb59c | 953 | health_code_update(); |
44a5e5eb | 954 | |
3bd1e081 | 955 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 956 | |
712ea556 | 957 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
958 | ret = lttcomm_recv_unix_sock(sock, &code, |
959 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
960 | if (ret <= 0) { |
961 | goto error; | |
962 | } | |
963 | ||
840cb59c | 964 | health_code_update(); |
44a5e5eb | 965 | |
f73fabfd | 966 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 967 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
968 | consumer_data->cmd_sock = |
969 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
331744e3 JD |
970 | consumer_data->metadata_sock.fd = |
971 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
972 | if (consumer_data->cmd_sock < 0 || | |
973 | consumer_data->metadata_sock.fd < 0) { | |
974 | PERROR("consumer connect cmd socket"); | |
a23ec3a7 DG |
975 | /* On error, signal condition and quit. */ |
976 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
977 | goto error; |
978 | } | |
331744e3 JD |
979 | /* Create metadata socket lock. */ |
980 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
981 | if (consumer_data->metadata_sock.lock == NULL) { | |
982 | PERROR("zmalloc pthread mutex"); | |
983 | ret = -1; | |
984 | goto error; | |
985 | } | |
986 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
987 | ||
a23ec3a7 | 988 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
989 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
990 | DBG("Consumer metadata socket ready (fd: %d)", | |
991 | consumer_data->metadata_sock.fd); | |
1d4b027a | 992 | } else { |
3bd1e081 | 993 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
994 | lttcomm_get_readable_code(-code)); |
995 | goto error; | |
996 | } | |
997 | ||
331744e3 | 998 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 999 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1000 | if (ret < 0) { |
72079cae DG |
1001 | goto error; |
1002 | } | |
1003 | ||
331744e3 | 1004 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1005 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1006 | if (ret < 0) { | |
72079cae | 1007 | goto error; |
5eb91c98 DG |
1008 | } |
1009 | ||
331744e3 JD |
1010 | /* Add metadata socket that is successfully connected. */ |
1011 | ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd, | |
1012 | LPOLLIN | LPOLLRDHUP); | |
1013 | if (ret < 0) { | |
1014 | goto error; | |
1015 | } | |
1016 | ||
840cb59c | 1017 | health_code_update(); |
44a5e5eb | 1018 | |
331744e3 | 1019 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1020 | restart_poll: |
331744e3 JD |
1021 | while (1) { |
1022 | health_poll_entry(); | |
1023 | ret = lttng_poll_wait(&events, -1); | |
1024 | health_poll_exit(); | |
1025 | if (ret < 0) { | |
1026 | /* | |
1027 | * Restart interrupted system call. | |
1028 | */ | |
1029 | if (errno == EINTR) { | |
1030 | goto restart_poll; | |
1031 | } | |
1032 | goto error; | |
88f2b785 | 1033 | } |
72079cae | 1034 | |
331744e3 | 1035 | nb_fd = ret; |
0d9c5d77 | 1036 | |
331744e3 JD |
1037 | for (i = 0; i < nb_fd; i++) { |
1038 | /* Fetch once the poll data */ | |
1039 | revents = LTTNG_POLL_GETEV(&events, i); | |
1040 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1041 | |
331744e3 | 1042 | health_code_update(); |
44a5e5eb | 1043 | |
331744e3 JD |
1044 | /* Thread quit pipe has been closed. Killing thread. */ |
1045 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1046 | if (ret) { | |
1047 | err = 0; | |
1048 | goto exit; | |
1049 | } | |
5eb91c98 | 1050 | |
331744e3 JD |
1051 | if (pollfd == sock) { |
1052 | /* Event on the consumerd socket */ | |
1053 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1054 | ERR("consumer err socket second poll error"); | |
1055 | goto error; | |
1056 | } | |
1057 | health_code_update(); | |
1058 | /* Wait for any kconsumerd error */ | |
1059 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1060 | sizeof(enum lttcomm_return_code)); | |
1061 | if (ret <= 0) { | |
1062 | ERR("consumer closed the command socket"); | |
1063 | goto error; | |
1064 | } | |
1065 | ||
1066 | ERR("consumer return code : %s", | |
1067 | lttcomm_get_readable_code(-code)); | |
1068 | ||
1069 | goto exit; | |
1070 | } else if (pollfd == consumer_data->metadata_sock.fd) { | |
1071 | /* UST metadata requests */ | |
1072 | ret = ust_consumer_metadata_request( | |
1073 | &consumer_data->metadata_sock); | |
1074 | if (ret < 0) { | |
1075 | ERR("Handling metadata request"); | |
1076 | goto error; | |
1077 | } | |
1078 | break; | |
1079 | } else { | |
1080 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1081 | goto error; |
1082 | } | |
1083 | } | |
331744e3 | 1084 | health_code_update(); |
5eb91c98 DG |
1085 | } |
1086 | ||
139ac872 | 1087 | exit: |
1d4b027a | 1088 | error: |
5c827ce0 DG |
1089 | /* Immediately set the consumerd state to stopped */ |
1090 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1091 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1092 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1093 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1094 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1095 | } else { | |
1096 | /* Code flow error... */ | |
1097 | assert(0); | |
1098 | } | |
1099 | ||
76d7553f MD |
1100 | if (consumer_data->err_sock >= 0) { |
1101 | ret = close(consumer_data->err_sock); | |
1102 | if (ret) { | |
1103 | PERROR("close"); | |
1104 | } | |
1105 | } | |
1106 | if (consumer_data->cmd_sock >= 0) { | |
1107 | ret = close(consumer_data->cmd_sock); | |
1108 | if (ret) { | |
1109 | PERROR("close"); | |
1110 | } | |
1111 | } | |
331744e3 JD |
1112 | if (consumer_data->metadata_sock.fd >= 0) { |
1113 | ret = close(consumer_data->metadata_sock.fd); | |
1114 | if (ret) { | |
1115 | PERROR("close"); | |
1116 | } | |
1117 | } | |
1118 | /* Cleanup metadata socket mutex. */ | |
1119 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1120 | free(consumer_data->metadata_sock.lock); | |
1121 | ||
76d7553f MD |
1122 | if (sock >= 0) { |
1123 | ret = close(sock); | |
1124 | if (ret) { | |
1125 | PERROR("close"); | |
1126 | } | |
1127 | } | |
273ea72c | 1128 | |
3bd1e081 MD |
1129 | unlink(consumer_data->err_unix_sock_path); |
1130 | unlink(consumer_data->cmd_unix_sock_path); | |
1131 | consumer_data->pid = 0; | |
1d4b027a | 1132 | |
5eb91c98 | 1133 | lttng_poll_clean(&events); |
76d7553f | 1134 | error_poll: |
139ac872 | 1135 | if (err) { |
840cb59c | 1136 | health_error(); |
139ac872 MD |
1137 | ERR("Health error occurred in %s", __func__); |
1138 | } | |
927ca06a | 1139 | health_unregister(); |
76d7553f | 1140 | DBG("consumer thread cleanup completed"); |
0177d773 | 1141 | |
5eb91c98 | 1142 | return NULL; |
099e26bd DG |
1143 | } |
1144 | ||
099e26bd DG |
1145 | /* |
1146 | * This thread manage application communication. | |
1d4b027a DG |
1147 | */ |
1148 | static void *thread_manage_apps(void *data) | |
099e26bd | 1149 | { |
139ac872 | 1150 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1151 | uint32_t revents, nb_fd; |
5eb91c98 | 1152 | struct lttng_poll_event events; |
099e26bd DG |
1153 | |
1154 | DBG("[thread] Manage application started"); | |
1155 | ||
f6a9efaa DG |
1156 | rcu_register_thread(); |
1157 | rcu_thread_online(); | |
1158 | ||
927ca06a DG |
1159 | health_register(HEALTH_TYPE_APP_MANAGE); |
1160 | ||
6993eeb3 CB |
1161 | if (testpoint(thread_manage_apps)) { |
1162 | goto error_testpoint; | |
1163 | } | |
1164 | ||
840cb59c | 1165 | health_code_update(); |
44a5e5eb | 1166 | |
d0b96690 | 1167 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1168 | if (ret < 0) { |
76d7553f | 1169 | goto error_poll_create; |
5eb91c98 | 1170 | } |
099e26bd | 1171 | |
5eb91c98 DG |
1172 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1173 | if (ret < 0) { | |
1174 | goto error; | |
1175 | } | |
099e26bd | 1176 | |
6993eeb3 CB |
1177 | if (testpoint(thread_manage_apps_before_loop)) { |
1178 | goto error; | |
1179 | } | |
8ac94142 | 1180 | |
840cb59c | 1181 | health_code_update(); |
44a5e5eb | 1182 | |
5eb91c98 | 1183 | while (1) { |
d21b0d71 | 1184 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1185 | |
1186 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1187 | restart: |
a78af745 | 1188 | health_poll_entry(); |
5eb91c98 | 1189 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1190 | health_poll_exit(); |
099e26bd | 1191 | if (ret < 0) { |
88f2b785 MD |
1192 | /* |
1193 | * Restart interrupted system call. | |
1194 | */ | |
1195 | if (errno == EINTR) { | |
1196 | goto restart; | |
1197 | } | |
099e26bd DG |
1198 | goto error; |
1199 | } | |
1200 | ||
0d9c5d77 DG |
1201 | nb_fd = ret; |
1202 | ||
5eb91c98 DG |
1203 | for (i = 0; i < nb_fd; i++) { |
1204 | /* Fetch once the poll data */ | |
1205 | revents = LTTNG_POLL_GETEV(&events, i); | |
1206 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1207 | ||
840cb59c | 1208 | health_code_update(); |
44a5e5eb | 1209 | |
5eb91c98 | 1210 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1211 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1212 | if (ret) { |
139ac872 MD |
1213 | err = 0; |
1214 | goto exit; | |
5eb91c98 | 1215 | } |
099e26bd | 1216 | |
5eb91c98 DG |
1217 | /* Inspect the apps cmd pipe */ |
1218 | if (pollfd == apps_cmd_pipe[0]) { | |
1219 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1220 | ERR("Apps command pipe error"); | |
0177d773 | 1221 | goto error; |
5eb91c98 | 1222 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1223 | int sock; |
1224 | ||
5eb91c98 | 1225 | /* Empty pipe */ |
f921c78f | 1226 | do { |
d0b96690 | 1227 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1228 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1229 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1230 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1231 | goto error; |
1232 | } | |
099e26bd | 1233 | |
840cb59c | 1234 | health_code_update(); |
44a5e5eb | 1235 | |
ffe60014 | 1236 | /* |
d0b96690 DG |
1237 | * We only monitor the error events of the socket. This |
1238 | * thread does not handle any incoming data from UST | |
1239 | * (POLLIN). | |
ffe60014 | 1240 | */ |
d0b96690 DG |
1241 | ret = lttng_poll_add(&events, sock, |
1242 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1243 | if (ret < 0) { | |
5eb91c98 | 1244 | goto error; |
e0c7ec2b | 1245 | } |
acc7b41b | 1246 | |
d0b96690 DG |
1247 | /* Set socket timeout for both receiving and ending */ |
1248 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1249 | app_socket_timeout); | |
1250 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1251 | app_socket_timeout); | |
ae9e45b3 | 1252 | |
d0b96690 | 1253 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1254 | |
840cb59c | 1255 | health_code_update(); |
44a5e5eb | 1256 | |
5eb91c98 | 1257 | break; |
0177d773 | 1258 | } |
5eb91c98 DG |
1259 | } else { |
1260 | /* | |
54d01ffb DG |
1261 | * At this point, we know that a registered application made |
1262 | * the event at poll_wait. | |
5eb91c98 DG |
1263 | */ |
1264 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1265 | /* Removing from the poll set */ | |
1266 | ret = lttng_poll_del(&events, pollfd); | |
1267 | if (ret < 0) { | |
1268 | goto error; | |
1269 | } | |
099e26bd | 1270 | |
b9d9b220 | 1271 | /* Socket closed on remote end. */ |
56fff090 | 1272 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1273 | break; |
1274 | } | |
099e26bd | 1275 | } |
44a5e5eb | 1276 | |
840cb59c | 1277 | health_code_update(); |
099e26bd | 1278 | } |
099e26bd DG |
1279 | } |
1280 | ||
139ac872 | 1281 | exit: |
099e26bd | 1282 | error: |
5eb91c98 | 1283 | lttng_poll_clean(&events); |
76d7553f | 1284 | error_poll_create: |
6993eeb3 | 1285 | error_testpoint: |
6620da75 DG |
1286 | utils_close_pipe(apps_cmd_pipe); |
1287 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1288 | ||
1289 | /* | |
1290 | * We don't clean the UST app hash table here since already registered | |
1291 | * applications can still be controlled so let them be until the session | |
1292 | * daemon dies or the applications stop. | |
1293 | */ | |
1294 | ||
139ac872 | 1295 | if (err) { |
840cb59c | 1296 | health_error(); |
139ac872 MD |
1297 | ERR("Health error occurred in %s", __func__); |
1298 | } | |
927ca06a | 1299 | health_unregister(); |
76d7553f | 1300 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1301 | rcu_thread_offline(); |
1302 | rcu_unregister_thread(); | |
099e26bd DG |
1303 | return NULL; |
1304 | } | |
1305 | ||
d0b96690 | 1306 | /* |
d88aee68 DG |
1307 | * Send a socket to a thread This is called from the dispatch UST registration |
1308 | * thread once all sockets are set for the application. | |
d0b96690 DG |
1309 | * |
1310 | * On success, return 0 else a negative value being the errno message of the | |
1311 | * write(). | |
1312 | */ | |
d88aee68 | 1313 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1314 | { |
1315 | int ret; | |
1316 | ||
d0b96690 | 1317 | /* Sockets MUST be set or else this should not have been called. */ |
d88aee68 DG |
1318 | assert(fd >= 0); |
1319 | assert(sock >= 0); | |
d0b96690 DG |
1320 | |
1321 | do { | |
d88aee68 | 1322 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1323 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1324 | if (ret < 0 || ret != sizeof(sock)) { |
1325 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1326 | if (ret < 0) { |
1327 | ret = -errno; | |
1328 | } | |
1329 | goto error; | |
1330 | } | |
1331 | ||
1332 | /* All good. Don't send back the write positive ret value. */ | |
1333 | ret = 0; | |
1334 | error: | |
1335 | return ret; | |
1336 | } | |
1337 | ||
f45e313d DG |
1338 | /* |
1339 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1340 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1341 | * notify socket is never received. | |
1342 | */ | |
1343 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1344 | { | |
1345 | int ret, nb_fd = 0, i; | |
1346 | unsigned int fd_added = 0; | |
1347 | struct lttng_poll_event events; | |
1348 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1349 | ||
1350 | assert(wait_queue); | |
1351 | ||
1352 | lttng_poll_init(&events); | |
1353 | ||
1354 | /* Just skip everything for an empty queue. */ | |
1355 | if (!wait_queue->count) { | |
1356 | goto end; | |
1357 | } | |
1358 | ||
1359 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1360 | if (ret < 0) { | |
1361 | goto error_create; | |
1362 | } | |
1363 | ||
1364 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1365 | &wait_queue->head, head) { | |
1366 | assert(wait_node->app); | |
1367 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1368 | LPOLLHUP | LPOLLERR); | |
1369 | if (ret < 0) { | |
1370 | goto error; | |
1371 | } | |
1372 | ||
1373 | fd_added = 1; | |
1374 | } | |
1375 | ||
1376 | if (!fd_added) { | |
1377 | goto end; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * Poll but don't block so we can quickly identify the faulty events and | |
1382 | * clean them afterwards from the wait queue. | |
1383 | */ | |
1384 | ret = lttng_poll_wait(&events, 0); | |
1385 | if (ret < 0) { | |
1386 | goto error; | |
1387 | } | |
1388 | nb_fd = ret; | |
1389 | ||
1390 | for (i = 0; i < nb_fd; i++) { | |
1391 | /* Get faulty FD. */ | |
1392 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1393 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1394 | ||
1395 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1396 | &wait_queue->head, head) { | |
1397 | if (pollfd == wait_node->app->sock && | |
1398 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1399 | cds_list_del(&wait_node->head); | |
1400 | wait_queue->count--; | |
1401 | ust_app_destroy(wait_node->app); | |
1402 | free(wait_node); | |
1403 | break; | |
1404 | } | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | if (nb_fd > 0) { | |
1409 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1410 | } | |
1411 | ||
1412 | end: | |
1413 | lttng_poll_clean(&events); | |
1414 | return; | |
1415 | ||
1416 | error: | |
1417 | lttng_poll_clean(&events); | |
1418 | error_create: | |
1419 | ERR("Unable to sanitize wait queue"); | |
1420 | return; | |
1421 | } | |
1422 | ||
099e26bd DG |
1423 | /* |
1424 | * Dispatch request from the registration threads to the application | |
1425 | * communication thread. | |
1426 | */ | |
1427 | static void *thread_dispatch_ust_registration(void *data) | |
1428 | { | |
12e2b881 | 1429 | int ret, err = -1; |
099e26bd DG |
1430 | struct cds_wfq_node *node; |
1431 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1432 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1433 | struct ust_reg_wait_queue wait_queue = { | |
1434 | .count = 0, | |
1435 | }; | |
d0b96690 | 1436 | |
12e2b881 MD |
1437 | health_register(HEALTH_TYPE_APP_REG_DISPATCH); |
1438 | ||
1439 | health_code_update(); | |
1440 | ||
f45e313d | 1441 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1442 | |
1443 | DBG("[thread] Dispatch UST command started"); | |
1444 | ||
26c9d55e | 1445 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1446 | health_code_update(); |
1447 | ||
099e26bd DG |
1448 | /* Atomically prepare the queue futex */ |
1449 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1450 | ||
1451 | do { | |
d0b96690 | 1452 | struct ust_app *app = NULL; |
7972aab2 | 1453 | ust_cmd = NULL; |
d0b96690 | 1454 | |
f45e313d DG |
1455 | /* |
1456 | * Make sure we don't have node(s) that have hung up before receiving | |
1457 | * the notify socket. This is to clean the list in order to avoid | |
1458 | * memory leaks from notify socket that are never seen. | |
1459 | */ | |
1460 | sanitize_wait_queue(&wait_queue); | |
1461 | ||
12e2b881 | 1462 | health_code_update(); |
099e26bd DG |
1463 | /* Dequeue command for registration */ |
1464 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1465 | if (node == NULL) { | |
00a17c97 | 1466 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1467 | /* Continue thread execution */ |
1468 | break; | |
1469 | } | |
1470 | ||
1471 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1472 | ||
2f50c8a3 DG |
1473 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1474 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1475 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1476 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1477 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1478 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1479 | |
1480 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1481 | wait_node = zmalloc(sizeof(*wait_node)); | |
1482 | if (!wait_node) { | |
1483 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1484 | ret = close(ust_cmd->sock); |
1485 | if (ret < 0) { | |
1486 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1487 | } | |
1488 | lttng_fd_put(1, LTTNG_FD_APPS); | |
7972aab2 | 1489 | free(ust_cmd); |
d0b96690 DG |
1490 | goto error; |
1491 | } | |
1492 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1493 | ||
1494 | /* Create application object if socket is CMD. */ | |
1495 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1496 | ust_cmd->sock); | |
1497 | if (!wait_node->app) { | |
1498 | ret = close(ust_cmd->sock); | |
1499 | if (ret < 0) { | |
1500 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1501 | } |
d88aee68 DG |
1502 | lttng_fd_put(1, LTTNG_FD_APPS); |
1503 | free(wait_node); | |
7972aab2 | 1504 | free(ust_cmd); |
d0b96690 DG |
1505 | continue; |
1506 | } | |
1507 | /* | |
1508 | * Add application to the wait queue so we can set the notify | |
1509 | * socket before putting this object in the global ht. | |
1510 | */ | |
f45e313d DG |
1511 | cds_list_add(&wait_node->head, &wait_queue.head); |
1512 | wait_queue.count++; | |
d0b96690 | 1513 | |
7972aab2 | 1514 | free(ust_cmd); |
d0b96690 DG |
1515 | /* |
1516 | * We have to continue here since we don't have the notify | |
1517 | * socket and the application MUST be added to the hash table | |
1518 | * only at that moment. | |
1519 | */ | |
1520 | continue; | |
1521 | } else { | |
1522 | /* | |
1523 | * Look for the application in the local wait queue and set the | |
1524 | * notify socket if found. | |
1525 | */ | |
d88aee68 | 1526 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1527 | &wait_queue.head, head) { |
12e2b881 | 1528 | health_code_update(); |
d0b96690 DG |
1529 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1530 | wait_node->app->notify_sock = ust_cmd->sock; | |
1531 | cds_list_del(&wait_node->head); | |
f45e313d | 1532 | wait_queue.count--; |
d0b96690 DG |
1533 | app = wait_node->app; |
1534 | free(wait_node); | |
1535 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1536 | break; | |
1537 | } | |
1538 | } | |
020d7f60 DG |
1539 | |
1540 | /* | |
1541 | * With no application at this stage the received socket is | |
1542 | * basically useless so close it before we free the cmd data | |
1543 | * structure for good. | |
1544 | */ | |
1545 | if (!app) { | |
1546 | ret = close(ust_cmd->sock); | |
1547 | if (ret < 0) { | |
1548 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1549 | } | |
1550 | lttng_fd_put(1, LTTNG_FD_APPS); | |
1551 | } | |
7972aab2 | 1552 | free(ust_cmd); |
d0b96690 DG |
1553 | } |
1554 | ||
1555 | if (app) { | |
d0b96690 DG |
1556 | /* |
1557 | * @session_lock_list | |
1558 | * | |
1559 | * Lock the global session list so from the register up to the | |
1560 | * registration done message, no thread can see the application | |
1561 | * and change its state. | |
1562 | */ | |
1563 | session_lock_list(); | |
1564 | rcu_read_lock(); | |
d88aee68 | 1565 | |
d0b96690 DG |
1566 | /* |
1567 | * Add application to the global hash table. This needs to be | |
1568 | * done before the update to the UST registry can locate the | |
1569 | * application. | |
1570 | */ | |
1571 | ust_app_add(app); | |
d88aee68 DG |
1572 | |
1573 | /* Set app version. This call will print an error if needed. */ | |
1574 | (void) ust_app_version(app); | |
1575 | ||
1576 | /* Send notify socket through the notify pipe. */ | |
1577 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1578 | app->notify_sock); | |
1579 | if (ret < 0) { | |
1580 | rcu_read_unlock(); | |
1581 | session_unlock_list(); | |
1582 | /* No notify thread, stop the UST tracing. */ | |
1583 | goto error; | |
6620da75 | 1584 | } |
d88aee68 | 1585 | |
d0b96690 DG |
1586 | /* |
1587 | * Update newly registered application with the tracing | |
1588 | * registry info already enabled information. | |
1589 | */ | |
1590 | update_ust_app(app->sock); | |
d88aee68 DG |
1591 | |
1592 | /* | |
1593 | * Don't care about return value. Let the manage apps threads | |
1594 | * handle app unregistration upon socket close. | |
1595 | */ | |
1596 | (void) ust_app_register_done(app->sock); | |
1597 | ||
1598 | /* | |
1599 | * Even if the application socket has been closed, send the app | |
1600 | * to the thread and unregistration will take place at that | |
1601 | * place. | |
1602 | */ | |
1603 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1604 | if (ret < 0) { |
d88aee68 DG |
1605 | rcu_read_unlock(); |
1606 | session_unlock_list(); | |
1607 | /* No apps. thread, stop the UST tracing. */ | |
1608 | goto error; | |
d0b96690 | 1609 | } |
d88aee68 | 1610 | |
d0b96690 DG |
1611 | rcu_read_unlock(); |
1612 | session_unlock_list(); | |
099e26bd | 1613 | } |
099e26bd DG |
1614 | } while (node != NULL); |
1615 | ||
12e2b881 | 1616 | health_poll_entry(); |
099e26bd DG |
1617 | /* Futex wait on queue. Blocking call on futex() */ |
1618 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1619 | health_poll_exit(); |
099e26bd | 1620 | } |
12e2b881 MD |
1621 | /* Normal exit, no error */ |
1622 | err = 0; | |
099e26bd DG |
1623 | |
1624 | error: | |
d88aee68 DG |
1625 | /* Clean up wait queue. */ |
1626 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1627 | &wait_queue.head, head) { |
d88aee68 | 1628 | cds_list_del(&wait_node->head); |
f45e313d | 1629 | wait_queue.count--; |
d88aee68 DG |
1630 | free(wait_node); |
1631 | } | |
1632 | ||
099e26bd | 1633 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1634 | if (err) { |
1635 | health_error(); | |
1636 | ERR("Health error occurred in %s", __func__); | |
1637 | } | |
1638 | health_unregister(); | |
099e26bd DG |
1639 | return NULL; |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * This thread manage application registration. | |
1644 | */ | |
1645 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1646 | { |
139ac872 | 1647 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1648 | uint32_t revents, nb_fd; |
1649 | struct lttng_poll_event events; | |
099e26bd DG |
1650 | /* |
1651 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1652 | * freed in the manage apps thread. | |
1653 | */ | |
1654 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1655 | |
099e26bd | 1656 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1657 | |
927ca06a DG |
1658 | health_register(HEALTH_TYPE_APP_REG); |
1659 | ||
6993eeb3 CB |
1660 | if (testpoint(thread_registration_apps)) { |
1661 | goto error_testpoint; | |
1662 | } | |
8ac94142 | 1663 | |
1d4b027a DG |
1664 | ret = lttcomm_listen_unix_sock(apps_sock); |
1665 | if (ret < 0) { | |
76d7553f | 1666 | goto error_listen; |
1d4b027a DG |
1667 | } |
1668 | ||
5eb91c98 DG |
1669 | /* |
1670 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1671 | * more will be added to this poll set. | |
1672 | */ | |
d0b96690 | 1673 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1674 | if (ret < 0) { |
76d7553f | 1675 | goto error_create_poll; |
5eb91c98 | 1676 | } |
273ea72c | 1677 | |
5eb91c98 DG |
1678 | /* Add the application registration socket */ |
1679 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1680 | if (ret < 0) { | |
76d7553f | 1681 | goto error_poll_add; |
5eb91c98 | 1682 | } |
273ea72c | 1683 | |
1d4b027a | 1684 | /* Notify all applications to register */ |
0fdd1e2c DG |
1685 | ret = notify_ust_apps(1); |
1686 | if (ret < 0) { | |
1687 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1688 | "Execution continues but there might be problem for already\n" |
1689 | "running applications that wishes to register."); | |
0fdd1e2c | 1690 | } |
1d4b027a DG |
1691 | |
1692 | while (1) { | |
1693 | DBG("Accepting application registration"); | |
273ea72c DG |
1694 | |
1695 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1696 | restart: |
a78af745 | 1697 | health_poll_entry(); |
5eb91c98 | 1698 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1699 | health_poll_exit(); |
273ea72c | 1700 | if (ret < 0) { |
88f2b785 MD |
1701 | /* |
1702 | * Restart interrupted system call. | |
1703 | */ | |
1704 | if (errno == EINTR) { | |
1705 | goto restart; | |
1706 | } | |
273ea72c DG |
1707 | goto error; |
1708 | } | |
1709 | ||
0d9c5d77 DG |
1710 | nb_fd = ret; |
1711 | ||
5eb91c98 | 1712 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1713 | health_code_update(); |
139ac872 | 1714 | |
5eb91c98 DG |
1715 | /* Fetch once the poll data */ |
1716 | revents = LTTNG_POLL_GETEV(&events, i); | |
1717 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1718 | |
5eb91c98 | 1719 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1720 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1721 | if (ret) { |
139ac872 MD |
1722 | err = 0; |
1723 | goto exit; | |
90014c57 | 1724 | } |
1d4b027a | 1725 | |
5eb91c98 DG |
1726 | /* Event on the registration socket */ |
1727 | if (pollfd == apps_sock) { | |
1728 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1729 | ERR("Register apps socket poll error"); | |
1730 | goto error; | |
1731 | } else if (revents & LPOLLIN) { | |
1732 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1733 | if (sock < 0) { | |
1734 | goto error; | |
1735 | } | |
099e26bd | 1736 | |
b662582b DG |
1737 | /* |
1738 | * Set the CLOEXEC flag. Return code is useless because | |
1739 | * either way, the show must go on. | |
1740 | */ | |
1741 | (void) utils_set_fd_cloexec(sock); | |
1742 | ||
5eb91c98 | 1743 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1744 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1745 | if (ust_cmd == NULL) { |
76d7553f | 1746 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1747 | goto error; |
1748 | } | |
1d4b027a | 1749 | |
5eb91c98 DG |
1750 | /* |
1751 | * Using message-based transmissions to ensure we don't | |
1752 | * have to deal with partially received messages. | |
1753 | */ | |
4063050c MD |
1754 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1755 | if (ret < 0) { | |
1756 | ERR("Exhausted file descriptors allowed for applications."); | |
1757 | free(ust_cmd); | |
1758 | ret = close(sock); | |
1759 | if (ret) { | |
1760 | PERROR("close"); | |
1761 | } | |
1762 | sock = -1; | |
1763 | continue; | |
1764 | } | |
d88aee68 | 1765 | |
840cb59c | 1766 | health_code_update(); |
d0b96690 DG |
1767 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1768 | if (ret < 0) { | |
5eb91c98 | 1769 | free(ust_cmd); |
d0b96690 | 1770 | /* Close socket of the application. */ |
76d7553f MD |
1771 | ret = close(sock); |
1772 | if (ret) { | |
1773 | PERROR("close"); | |
1774 | } | |
4063050c | 1775 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1776 | sock = -1; |
5eb91c98 DG |
1777 | continue; |
1778 | } | |
840cb59c | 1779 | health_code_update(); |
099e26bd | 1780 | |
5eb91c98 | 1781 | ust_cmd->sock = sock; |
34a2494f | 1782 | sock = -1; |
099e26bd | 1783 | |
5eb91c98 DG |
1784 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1785 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1786 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1787 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1788 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1789 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1790 | |
5eb91c98 DG |
1791 | /* |
1792 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1793 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1794 | */ |
1795 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1796 | ||
1797 | /* | |
1798 | * Wake the registration queue futex. Implicit memory | |
1799 | * barrier with the exchange in cds_wfq_enqueue. | |
1800 | */ | |
1801 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1802 | } | |
1803 | } | |
90014c57 | 1804 | } |
1d4b027a DG |
1805 | } |
1806 | ||
139ac872 | 1807 | exit: |
1d4b027a | 1808 | error: |
139ac872 | 1809 | if (err) { |
840cb59c | 1810 | health_error(); |
139ac872 MD |
1811 | ERR("Health error occurred in %s", __func__); |
1812 | } | |
139ac872 | 1813 | |
0fdd1e2c DG |
1814 | /* Notify that the registration thread is gone */ |
1815 | notify_ust_apps(0); | |
1816 | ||
a4b35e07 | 1817 | if (apps_sock >= 0) { |
76d7553f MD |
1818 | ret = close(apps_sock); |
1819 | if (ret) { | |
1820 | PERROR("close"); | |
1821 | } | |
a4b35e07 | 1822 | } |
46c3f085 | 1823 | if (sock >= 0) { |
76d7553f MD |
1824 | ret = close(sock); |
1825 | if (ret) { | |
1826 | PERROR("close"); | |
1827 | } | |
4063050c | 1828 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1829 | } |
273ea72c | 1830 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1831 | |
76d7553f | 1832 | error_poll_add: |
5eb91c98 | 1833 | lttng_poll_clean(&events); |
76d7553f MD |
1834 | error_listen: |
1835 | error_create_poll: | |
6993eeb3 | 1836 | error_testpoint: |
76d7553f | 1837 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1838 | health_unregister(); |
5eb91c98 | 1839 | |
1d4b027a DG |
1840 | return NULL; |
1841 | } | |
1842 | ||
8c0faa1d | 1843 | /* |
3bd1e081 | 1844 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1845 | * exec or it will fails. |
8c0faa1d | 1846 | */ |
3bd1e081 | 1847 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1848 | { |
a23ec3a7 | 1849 | int ret, clock_ret; |
ee0b0061 DG |
1850 | struct timespec timeout; |
1851 | ||
a23ec3a7 DG |
1852 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1853 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1854 | |
a23ec3a7 DG |
1855 | /* Setup pthread condition */ |
1856 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1857 | if (ret != 0) { | |
1858 | errno = ret; | |
1859 | PERROR("pthread_condattr_init consumer data"); | |
1860 | goto error; | |
1861 | } | |
1862 | ||
1863 | /* | |
1864 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1865 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1866 | * for a more details and how we noticed it. | |
1867 | */ | |
1868 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1869 | if (ret != 0) { | |
1870 | errno = ret; | |
1871 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1872 | goto error; |
1873 | } | |
8c0faa1d | 1874 | |
a23ec3a7 DG |
1875 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1876 | if (ret != 0) { | |
1877 | errno = ret; | |
1878 | PERROR("pthread_cond_init consumer data"); | |
1879 | goto error; | |
1880 | } | |
1881 | ||
1882 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1883 | consumer_data); | |
8c0faa1d | 1884 | if (ret != 0) { |
3bd1e081 | 1885 | PERROR("pthread_create consumer"); |
ee0b0061 | 1886 | ret = -1; |
8c0faa1d DG |
1887 | goto error; |
1888 | } | |
1889 | ||
a23ec3a7 DG |
1890 | /* We are about to wait on a pthread condition */ |
1891 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1892 | ||
ee0b0061 | 1893 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1894 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1895 | /* | |
1896 | * Set the timeout for the condition timed wait even if the clock gettime | |
1897 | * call fails since we might loop on that call and we want to avoid to | |
1898 | * increment the timeout too many times. | |
1899 | */ | |
1900 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1901 | ||
1902 | /* | |
1903 | * The following loop COULD be skipped in some conditions so this is why we | |
1904 | * set ret to 0 in order to make sure at least one round of the loop is | |
1905 | * done. | |
1906 | */ | |
1907 | ret = 0; | |
1908 | ||
1909 | /* | |
1910 | * Loop until the condition is reached or when a timeout is reached. Note | |
1911 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1912 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1913 | * possible. This loop does not take any chances and works with both of | |
1914 | * them. | |
1915 | */ | |
1916 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1917 | if (clock_ret < 0) { | |
1918 | PERROR("clock_gettime spawn consumer"); | |
1919 | /* Infinite wait for the consumerd thread to be ready */ | |
1920 | ret = pthread_cond_wait(&consumer_data->cond, | |
1921 | &consumer_data->cond_mutex); | |
1922 | } else { | |
1923 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1924 | &consumer_data->cond_mutex, &timeout); | |
1925 | } | |
ee0b0061 | 1926 | } |
8c0faa1d | 1927 | |
a23ec3a7 DG |
1928 | /* Release the pthread condition */ |
1929 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1930 | ||
1931 | if (ret != 0) { | |
1932 | errno = ret; | |
1933 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1934 | /* |
1935 | * Call has timed out so we kill the kconsumerd_thread and return | |
1936 | * an error. | |
1937 | */ | |
a23ec3a7 DG |
1938 | ERR("Condition timed out. The consumer thread was never ready." |
1939 | " Killing it"); | |
3bd1e081 | 1940 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1941 | if (ret < 0) { |
3bd1e081 | 1942 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1943 | } |
1944 | } else { | |
a23ec3a7 | 1945 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1946 | } |
1947 | goto error; | |
1948 | } | |
1949 | ||
3bd1e081 MD |
1950 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1951 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1952 | ERR("Consumerd did not start"); |
3bd1e081 | 1953 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1954 | goto error; |
1955 | } | |
3bd1e081 | 1956 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1957 | |
8c0faa1d DG |
1958 | return 0; |
1959 | ||
1960 | error: | |
1961 | return ret; | |
1962 | } | |
1963 | ||
d9800920 | 1964 | /* |
3bd1e081 | 1965 | * Join consumer thread |
d9800920 | 1966 | */ |
3bd1e081 | 1967 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1968 | { |
1969 | void *status; | |
cf3af59e | 1970 | |
e8209f6b DG |
1971 | /* Consumer pid must be a real one. */ |
1972 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1973 | int ret; |
3bd1e081 | 1974 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1975 | if (ret) { |
3bd1e081 | 1976 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1977 | return ret; |
1978 | } | |
3bd1e081 | 1979 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1980 | } else { |
1981 | return 0; | |
1982 | } | |
1983 | } | |
1984 | ||
8c0faa1d | 1985 | /* |
3bd1e081 | 1986 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1987 | * |
d063d709 | 1988 | * Return pid if successful else -1. |
8c0faa1d | 1989 | */ |
3bd1e081 | 1990 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1991 | { |
1992 | int ret; | |
1993 | pid_t pid; | |
94c55f17 | 1994 | const char *consumer_to_use; |
53086306 | 1995 | const char *verbosity; |
94c55f17 | 1996 | struct stat st; |
8c0faa1d | 1997 | |
3bd1e081 | 1998 | DBG("Spawning consumerd"); |
c49dc785 | 1999 | |
8c0faa1d DG |
2000 | pid = fork(); |
2001 | if (pid == 0) { | |
2002 | /* | |
3bd1e081 | 2003 | * Exec consumerd. |
8c0faa1d | 2004 | */ |
daee5345 | 2005 | if (opt_verbose_consumer) { |
53086306 DG |
2006 | verbosity = "--verbose"; |
2007 | } else { | |
2008 | verbosity = "--quiet"; | |
2009 | } | |
3bd1e081 MD |
2010 | switch (consumer_data->type) { |
2011 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2012 | /* |
c7704d57 DG |
2013 | * Find out which consumerd to execute. We will first try the |
2014 | * 64-bit path, then the sessiond's installation directory, and | |
2015 | * fallback on the 32-bit one, | |
94c55f17 | 2016 | */ |
63a799e8 AM |
2017 | DBG3("Looking for a kernel consumer at these locations:"); |
2018 | DBG3(" 1) %s", consumerd64_bin); | |
2019 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2020 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2021 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2022 | DBG3("Found location #1"); |
94c55f17 | 2023 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2024 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2025 | DBG3("Found location #2"); |
94c55f17 | 2026 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2027 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2028 | DBG3("Found location #3"); |
eb1e0bd4 | 2029 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2030 | } else { |
63a799e8 | 2031 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2032 | break; |
2033 | } | |
2034 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2035 | execl(consumer_to_use, | |
2036 | "lttng-consumerd", verbosity, "-k", | |
2037 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2038 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2039 | NULL); | |
3bd1e081 | 2040 | break; |
7753dea8 MD |
2041 | case LTTNG_CONSUMER64_UST: |
2042 | { | |
b1e0b6b6 | 2043 | char *tmpnew = NULL; |
8f4905da MD |
2044 | |
2045 | if (consumerd64_libdir[0] != '\0') { | |
2046 | char *tmp; | |
2047 | size_t tmplen; | |
2048 | ||
2049 | tmp = getenv("LD_LIBRARY_PATH"); | |
2050 | if (!tmp) { | |
2051 | tmp = ""; | |
2052 | } | |
2053 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2054 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2055 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2056 | if (!tmpnew) { | |
2057 | ret = -ENOMEM; | |
2058 | goto error; | |
2059 | } | |
2060 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2061 | strcat(tmpnew, consumerd64_libdir); | |
2062 | if (tmp[0] != '\0') { | |
2063 | strcat(tmpnew, ":"); | |
2064 | strcat(tmpnew, tmp); | |
2065 | } | |
2066 | ret = putenv(tmpnew); | |
2067 | if (ret) { | |
2068 | ret = -errno; | |
c6f76da9 | 2069 | free(tmpnew); |
8f4905da MD |
2070 | goto error; |
2071 | } | |
2072 | } | |
94c55f17 | 2073 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2074 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2075 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2076 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2077 | NULL); | |
8f4905da MD |
2078 | if (consumerd64_libdir[0] != '\0') { |
2079 | free(tmpnew); | |
2080 | } | |
2081 | if (ret) { | |
2082 | goto error; | |
2083 | } | |
3bd1e081 | 2084 | break; |
7753dea8 MD |
2085 | } |
2086 | case LTTNG_CONSUMER32_UST: | |
2087 | { | |
937dde8e | 2088 | char *tmpnew = NULL; |
8f4905da MD |
2089 | |
2090 | if (consumerd32_libdir[0] != '\0') { | |
2091 | char *tmp; | |
2092 | size_t tmplen; | |
2093 | ||
2094 | tmp = getenv("LD_LIBRARY_PATH"); | |
2095 | if (!tmp) { | |
2096 | tmp = ""; | |
2097 | } | |
2098 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2099 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2100 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2101 | if (!tmpnew) { | |
2102 | ret = -ENOMEM; | |
2103 | goto error; | |
2104 | } | |
2105 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2106 | strcat(tmpnew, consumerd32_libdir); | |
2107 | if (tmp[0] != '\0') { | |
2108 | strcat(tmpnew, ":"); | |
2109 | strcat(tmpnew, tmp); | |
2110 | } | |
2111 | ret = putenv(tmpnew); | |
2112 | if (ret) { | |
2113 | ret = -errno; | |
c6f76da9 | 2114 | free(tmpnew); |
8f4905da MD |
2115 | goto error; |
2116 | } | |
2117 | } | |
94c55f17 | 2118 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2119 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2120 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2121 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2122 | NULL); | |
8f4905da MD |
2123 | if (consumerd32_libdir[0] != '\0') { |
2124 | free(tmpnew); | |
2125 | } | |
2126 | if (ret) { | |
2127 | goto error; | |
2128 | } | |
7753dea8 MD |
2129 | break; |
2130 | } | |
3bd1e081 | 2131 | default: |
76d7553f | 2132 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2133 | exit(EXIT_FAILURE); |
2134 | } | |
8c0faa1d | 2135 | if (errno != 0) { |
76d7553f | 2136 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2137 | } |
2138 | exit(EXIT_FAILURE); | |
2139 | } else if (pid > 0) { | |
2140 | ret = pid; | |
8c0faa1d | 2141 | } else { |
76d7553f | 2142 | PERROR("start consumer fork"); |
8c0faa1d | 2143 | ret = -errno; |
8c0faa1d | 2144 | } |
8f4905da | 2145 | error: |
8c0faa1d DG |
2146 | return ret; |
2147 | } | |
2148 | ||
693bd40b | 2149 | /* |
3bd1e081 | 2150 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2151 | */ |
3bd1e081 | 2152 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2153 | { |
c617c0c6 | 2154 | int ret; |
edb8b045 DG |
2155 | |
2156 | /* | |
2157 | * Set the listen() state on the socket since there is a possible race | |
2158 | * between the exec() of the consumer daemon and this call if place in the | |
2159 | * consumer thread. See bug #366 for more details. | |
2160 | */ | |
2161 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2162 | if (ret < 0) { | |
2163 | goto error; | |
2164 | } | |
693bd40b | 2165 | |
3bd1e081 MD |
2166 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2167 | if (consumer_data->pid != 0) { | |
2168 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2169 | goto end; |
2170 | } | |
693bd40b | 2171 | |
3bd1e081 | 2172 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2173 | if (ret < 0) { |
3bd1e081 MD |
2174 | ERR("Spawning consumerd failed"); |
2175 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2176 | goto error; |
693bd40b | 2177 | } |
c49dc785 | 2178 | |
3bd1e081 MD |
2179 | /* Setting up the consumer_data pid */ |
2180 | consumer_data->pid = ret; | |
48842b30 | 2181 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2182 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2183 | |
3bd1e081 MD |
2184 | DBG2("Spawning consumer control thread"); |
2185 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2186 | if (ret < 0) { |
3bd1e081 | 2187 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2188 | goto error; |
2189 | } | |
2190 | ||
c49dc785 | 2191 | end: |
693bd40b DG |
2192 | return 0; |
2193 | ||
2194 | error: | |
331744e3 | 2195 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2196 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2197 | int err; |
2198 | ||
edb8b045 DG |
2199 | err = close(consumer_data->err_sock); |
2200 | if (err < 0) { | |
2201 | PERROR("close consumer data error socket"); | |
2202 | } | |
2203 | } | |
693bd40b DG |
2204 | return ret; |
2205 | } | |
2206 | ||
44a5e5eb | 2207 | /* |
139ac872 MD |
2208 | * Compute health status of each consumer. If one of them is zero (bad |
2209 | * state), we return 0. | |
44a5e5eb DG |
2210 | */ |
2211 | static int check_consumer_health(void) | |
2212 | { | |
2213 | int ret; | |
2214 | ||
927ca06a | 2215 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2216 | |
2217 | DBG3("Health consumer check %d", ret); | |
2218 | ||
2219 | return ret; | |
2220 | } | |
2221 | ||
b73401da | 2222 | /* |
096102bd | 2223 | * Setup necessary data for kernel tracer action. |
b73401da | 2224 | */ |
096102bd | 2225 | static int init_kernel_tracer(void) |
b73401da DG |
2226 | { |
2227 | int ret; | |
b73401da | 2228 | |
096102bd DG |
2229 | /* Modprobe lttng kernel modules */ |
2230 | ret = modprobe_lttng_control(); | |
b73401da | 2231 | if (ret < 0) { |
b73401da DG |
2232 | goto error; |
2233 | } | |
2234 | ||
096102bd DG |
2235 | /* Open debugfs lttng */ |
2236 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2237 | if (kernel_tracer_fd < 0) { | |
2238 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2239 | ret = -1; |
2240 | goto error_open; | |
54d01ffb DG |
2241 | } |
2242 | ||
2f77fc4b DG |
2243 | /* Validate kernel version */ |
2244 | ret = kernel_validate_version(kernel_tracer_fd); | |
2245 | if (ret < 0) { | |
2246 | goto error_version; | |
b551a063 | 2247 | } |
54d01ffb | 2248 | |
2f77fc4b DG |
2249 | ret = modprobe_lttng_data(); |
2250 | if (ret < 0) { | |
2251 | goto error_modules; | |
54d01ffb DG |
2252 | } |
2253 | ||
2f77fc4b DG |
2254 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2255 | return 0; | |
2256 | ||
2257 | error_version: | |
2258 | modprobe_remove_lttng_control(); | |
2259 | ret = close(kernel_tracer_fd); | |
2260 | if (ret) { | |
2261 | PERROR("close"); | |
b551a063 | 2262 | } |
2f77fc4b | 2263 | kernel_tracer_fd = -1; |
f73fabfd | 2264 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2265 | |
2f77fc4b DG |
2266 | error_modules: |
2267 | ret = close(kernel_tracer_fd); | |
2268 | if (ret) { | |
2269 | PERROR("close"); | |
b551a063 | 2270 | } |
54d01ffb | 2271 | |
2f77fc4b DG |
2272 | error_open: |
2273 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2274 | |
2275 | error: | |
2f77fc4b DG |
2276 | WARN("No kernel tracer available"); |
2277 | kernel_tracer_fd = -1; | |
2278 | if (!is_root) { | |
f73fabfd | 2279 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2280 | } else { |
f73fabfd | 2281 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2282 | } |
54d01ffb DG |
2283 | } |
2284 | ||
2f77fc4b | 2285 | |
54d01ffb | 2286 | /* |
2f77fc4b DG |
2287 | * Copy consumer output from the tracing session to the domain session. The |
2288 | * function also applies the right modification on a per domain basis for the | |
2289 | * trace files destination directory. | |
36b588ed MD |
2290 | * |
2291 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2292 | */ |
2f77fc4b | 2293 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2294 | { |
2295 | int ret; | |
2f77fc4b DG |
2296 | const char *dir_name; |
2297 | struct consumer_output *consumer; | |
2298 | ||
2299 | assert(session); | |
2300 | assert(session->consumer); | |
54d01ffb | 2301 | |
b551a063 DG |
2302 | switch (domain) { |
2303 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2304 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2305 | /* |
2306 | * XXX: We should audit the session creation and what this function | |
2307 | * does "extra" in order to avoid a destroy since this function is used | |
2308 | * in the domain session creation (kernel and ust) only. Same for UST | |
2309 | * domain. | |
2310 | */ | |
2311 | if (session->kernel_session->consumer) { | |
2312 | consumer_destroy_output(session->kernel_session->consumer); | |
2313 | } | |
2f77fc4b DG |
2314 | session->kernel_session->consumer = |
2315 | consumer_copy_output(session->consumer); | |
2316 | /* Ease our life a bit for the next part */ | |
2317 | consumer = session->kernel_session->consumer; | |
2318 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2319 | break; |
2320 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2321 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2322 | if (session->ust_session->consumer) { |
2323 | consumer_destroy_output(session->ust_session->consumer); | |
2324 | } | |
2f77fc4b DG |
2325 | session->ust_session->consumer = |
2326 | consumer_copy_output(session->consumer); | |
2327 | /* Ease our life a bit for the next part */ | |
2328 | consumer = session->ust_session->consumer; | |
2329 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2330 | break; |
2331 | default: | |
f73fabfd | 2332 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2333 | goto error; |
2334 | } | |
2335 | ||
2f77fc4b | 2336 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2337 | strncat(consumer->subdir, dir_name, |
2338 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2339 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2340 | ||
f73fabfd | 2341 | ret = LTTNG_OK; |
54d01ffb DG |
2342 | |
2343 | error: | |
2344 | return ret; | |
2345 | } | |
2346 | ||
00e2e675 | 2347 | /* |
2f77fc4b | 2348 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2349 | * |
2350 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2351 | */ |
2f77fc4b DG |
2352 | static int create_ust_session(struct ltt_session *session, |
2353 | struct lttng_domain *domain) | |
00e2e675 DG |
2354 | { |
2355 | int ret; | |
2f77fc4b | 2356 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2357 | |
a4b92340 | 2358 | assert(session); |
2f77fc4b DG |
2359 | assert(domain); |
2360 | assert(session->consumer); | |
a4b92340 | 2361 | |
2f77fc4b DG |
2362 | switch (domain->type) { |
2363 | case LTTNG_DOMAIN_UST: | |
2364 | break; | |
2365 | default: | |
2366 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2367 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2368 | goto error; |
2369 | } | |
2370 | ||
2f77fc4b DG |
2371 | DBG("Creating UST session"); |
2372 | ||
dec56f6c | 2373 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2374 | if (lus == NULL) { |
f73fabfd | 2375 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2376 | goto error; |
2377 | } | |
2378 | ||
2f77fc4b DG |
2379 | lus->uid = session->uid; |
2380 | lus->gid = session->gid; | |
2bba9e53 | 2381 | lus->output_traces = session->output_traces; |
2f77fc4b | 2382 | session->ust_session = lus; |
00e2e675 | 2383 | |
2f77fc4b DG |
2384 | /* Copy session output to the newly created UST session */ |
2385 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2386 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2387 | goto error; |
2388 | } | |
2389 | ||
f73fabfd | 2390 | return LTTNG_OK; |
00e2e675 DG |
2391 | |
2392 | error: | |
2f77fc4b DG |
2393 | free(lus); |
2394 | session->ust_session = NULL; | |
00e2e675 DG |
2395 | return ret; |
2396 | } | |
2397 | ||
2398 | /* | |
2f77fc4b | 2399 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2400 | */ |
2f77fc4b | 2401 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2402 | { |
2403 | int ret; | |
a4b92340 | 2404 | |
2f77fc4b | 2405 | DBG("Creating kernel session"); |
00e2e675 | 2406 | |
2f77fc4b DG |
2407 | ret = kernel_create_session(session, kernel_tracer_fd); |
2408 | if (ret < 0) { | |
f73fabfd | 2409 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2410 | goto error; |
2411 | } | |
2412 | ||
2f77fc4b DG |
2413 | /* Code flow safety */ |
2414 | assert(session->kernel_session); | |
2415 | ||
2416 | /* Copy session output to the newly created Kernel session */ | |
2417 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2418 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2419 | goto error; |
2420 | } | |
2421 | ||
2f77fc4b DG |
2422 | /* Create directory(ies) on local filesystem. */ |
2423 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2424 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2425 | ret = run_as_mkdir_recursive( | |
2426 | session->kernel_session->consumer->dst.trace_path, | |
2427 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2428 | if (ret < 0) { | |
2429 | if (ret != -EEXIST) { | |
2430 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2431 | goto error; |
2432 | } | |
00e2e675 | 2433 | } |
2f77fc4b | 2434 | } |
00e2e675 | 2435 | |
2f77fc4b DG |
2436 | session->kernel_session->uid = session->uid; |
2437 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2438 | session->kernel_session->output_traces = session->output_traces; |
00e2e675 | 2439 | |
f73fabfd | 2440 | return LTTNG_OK; |
00e2e675 | 2441 | |
2f77fc4b DG |
2442 | error: |
2443 | trace_kernel_destroy_session(session->kernel_session); | |
2444 | session->kernel_session = NULL; | |
2445 | return ret; | |
2446 | } | |
00e2e675 | 2447 | |
2f77fc4b DG |
2448 | /* |
2449 | * Count number of session permitted by uid/gid. | |
2450 | */ | |
2451 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2452 | { | |
2453 | unsigned int i = 0; | |
2454 | struct ltt_session *session; | |
07424f16 | 2455 | |
2f77fc4b DG |
2456 | DBG("Counting number of available session for UID %d GID %d", |
2457 | uid, gid); | |
2458 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2459 | /* |
2f77fc4b | 2460 | * Only list the sessions the user can control. |
00e2e675 | 2461 | */ |
2f77fc4b DG |
2462 | if (!session_access_ok(session, uid, gid)) { |
2463 | continue; | |
2464 | } | |
2465 | i++; | |
a4b92340 | 2466 | } |
2f77fc4b | 2467 | return i; |
00e2e675 DG |
2468 | } |
2469 | ||
54d01ffb DG |
2470 | /* |
2471 | * Process the command requested by the lttng client within the command | |
2472 | * context structure. This function make sure that the return structure (llm) | |
2473 | * is set and ready for transmission before returning. | |
2474 | * | |
2475 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2476 | * |
2477 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2478 | * |
2479 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2480 | */ |
53a80697 MD |
2481 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2482 | int *sock_error) | |
54d01ffb | 2483 | { |
f73fabfd | 2484 | int ret = LTTNG_OK; |
44d3bd01 | 2485 | int need_tracing_session = 1; |
2e09ba09 | 2486 | int need_domain; |
54d01ffb DG |
2487 | |
2488 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2489 | ||
53a80697 MD |
2490 | *sock_error = 0; |
2491 | ||
2e09ba09 MD |
2492 | switch (cmd_ctx->lsm->cmd_type) { |
2493 | case LTTNG_CREATE_SESSION: | |
2494 | case LTTNG_DESTROY_SESSION: | |
2495 | case LTTNG_LIST_SESSIONS: | |
2496 | case LTTNG_LIST_DOMAINS: | |
2497 | case LTTNG_START_TRACE: | |
2498 | case LTTNG_STOP_TRACE: | |
6d805429 | 2499 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2500 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2501 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2502 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2503 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2504 | need_domain = 0; |
3aace903 | 2505 | break; |
2e09ba09 MD |
2506 | default: |
2507 | need_domain = 1; | |
2508 | } | |
2509 | ||
2510 | if (opt_no_kernel && need_domain | |
2511 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2512 | if (!is_root) { |
f73fabfd | 2513 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2514 | } else { |
f73fabfd | 2515 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2516 | } |
4fba7219 DG |
2517 | goto error; |
2518 | } | |
2519 | ||
8d3113b2 DG |
2520 | /* Deny register consumer if we already have a spawned consumer. */ |
2521 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2522 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2523 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2524 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2525 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2526 | goto error; |
2527 | } | |
2528 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2529 | } | |
2530 | ||
54d01ffb DG |
2531 | /* |
2532 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2533 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2534 | * command. |
2535 | */ | |
2536 | switch(cmd_ctx->lsm->cmd_type) { | |
2537 | case LTTNG_LIST_SESSIONS: | |
2538 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2539 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2540 | case LTTNG_LIST_DOMAINS: |
2541 | case LTTNG_LIST_CHANNELS: | |
2542 | case LTTNG_LIST_EVENTS: | |
2543 | break; | |
2544 | default: | |
2545 | /* Setup lttng message with no payload */ | |
2546 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2547 | if (ret < 0) { | |
2548 | /* This label does not try to unlock the session */ | |
2549 | goto init_setup_error; | |
2550 | } | |
2551 | } | |
2552 | ||
2553 | /* Commands that DO NOT need a session. */ | |
2554 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2555 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2556 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2557 | case LTTNG_LIST_SESSIONS: |
2558 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2559 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2560 | need_tracing_session = 0; |
54d01ffb DG |
2561 | break; |
2562 | default: | |
2563 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2564 | /* |
2565 | * We keep the session list lock across _all_ commands | |
2566 | * for now, because the per-session lock does not | |
2567 | * handle teardown properly. | |
2568 | */ | |
74babd95 | 2569 | session_lock_list(); |
54d01ffb DG |
2570 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2571 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2572 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2573 | goto error; |
2574 | } else { | |
2575 | /* Acquire lock for the session */ | |
2576 | session_lock(cmd_ctx->session); | |
2577 | } | |
2578 | break; | |
2579 | } | |
b389abbe | 2580 | |
2e09ba09 MD |
2581 | if (!need_domain) { |
2582 | goto skip_domain; | |
2583 | } | |
a4b92340 | 2584 | |
54d01ffb DG |
2585 | /* |
2586 | * Check domain type for specific "pre-action". | |
2587 | */ | |
2588 | switch (cmd_ctx->lsm->domain.type) { | |
2589 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2590 | if (!is_root) { |
f73fabfd | 2591 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2592 | goto error; |
2593 | } | |
2594 | ||
54d01ffb | 2595 | /* Kernel tracer check */ |
a4b35e07 | 2596 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2597 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2598 | ret = init_kernel_tracer(); |
2599 | if (ret != 0) { | |
54d01ffb DG |
2600 | goto error; |
2601 | } | |
2602 | } | |
5eb91c98 | 2603 | |
5c827ce0 DG |
2604 | /* Consumer is in an ERROR state. Report back to client */ |
2605 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2606 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2607 | goto error; |
2608 | } | |
2609 | ||
54d01ffb | 2610 | /* Need a session for kernel command */ |
44d3bd01 | 2611 | if (need_tracing_session) { |
54d01ffb | 2612 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2613 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2614 | if (ret < 0) { |
f73fabfd | 2615 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2616 | goto error; |
2617 | } | |
b389abbe | 2618 | } |
7d29a247 | 2619 | |
54d01ffb | 2620 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2621 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2622 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2623 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2624 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2625 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2626 | if (ret < 0) { |
f73fabfd | 2627 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2628 | goto error; |
950131af | 2629 | } |
5c827ce0 | 2630 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2631 | } else { |
2632 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2633 | } |
173af62f | 2634 | |
a4b92340 DG |
2635 | /* |
2636 | * The consumer was just spawned so we need to add the socket to | |
2637 | * the consumer output of the session if exist. | |
2638 | */ | |
2639 | ret = consumer_create_socket(&kconsumer_data, | |
2640 | cmd_ctx->session->kernel_session->consumer); | |
2641 | if (ret < 0) { | |
2642 | goto error; | |
173af62f | 2643 | } |
0d0c377a | 2644 | } |
5c827ce0 | 2645 | |
54d01ffb | 2646 | break; |
2bdd86d4 | 2647 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2648 | { |
5c827ce0 DG |
2649 | /* Consumer is in an ERROR state. Report back to client */ |
2650 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2651 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2652 | goto error; |
2653 | } | |
2654 | ||
44d3bd01 | 2655 | if (need_tracing_session) { |
a4b92340 | 2656 | /* Create UST session if none exist. */ |
f6a9efaa | 2657 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2658 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2659 | &cmd_ctx->lsm->domain); |
f73fabfd | 2660 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2661 | goto error; |
2662 | } | |
2663 | } | |
00e2e675 | 2664 | |
7753dea8 MD |
2665 | /* Start the UST consumer daemons */ |
2666 | /* 64-bit */ | |
2667 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2668 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2669 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2670 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2671 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2672 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2673 | if (ret < 0) { |
f73fabfd | 2674 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2675 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2676 | goto error; |
2677 | } | |
48842b30 | 2678 | |
173af62f | 2679 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2680 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2681 | } else { |
7753dea8 MD |
2682 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2683 | } | |
173af62f DG |
2684 | |
2685 | /* | |
2686 | * Setup socket for consumer 64 bit. No need for atomic access | |
2687 | * since it was set above and can ONLY be set in this thread. | |
2688 | */ | |
a4b92340 DG |
2689 | ret = consumer_create_socket(&ustconsumer64_data, |
2690 | cmd_ctx->session->ust_session->consumer); | |
2691 | if (ret < 0) { | |
2692 | goto error; | |
173af62f DG |
2693 | } |
2694 | ||
7753dea8 | 2695 | /* 32-bit */ |
fc7a59ce | 2696 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2697 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2698 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2699 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2700 | ret = start_consumerd(&ustconsumer32_data); | |
2701 | if (ret < 0) { | |
f73fabfd | 2702 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2703 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2704 | goto error; |
2705 | } | |
5c827ce0 | 2706 | |
173af62f | 2707 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2708 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2709 | } else { |
2710 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2711 | } |
173af62f DG |
2712 | |
2713 | /* | |
2714 | * Setup socket for consumer 64 bit. No need for atomic access | |
2715 | * since it was set above and can ONLY be set in this thread. | |
2716 | */ | |
a4b92340 DG |
2717 | ret = consumer_create_socket(&ustconsumer32_data, |
2718 | cmd_ctx->session->ust_session->consumer); | |
2719 | if (ret < 0) { | |
2720 | goto error; | |
173af62f | 2721 | } |
44d3bd01 DG |
2722 | } |
2723 | break; | |
48842b30 | 2724 | } |
54d01ffb | 2725 | default: |
54d01ffb DG |
2726 | break; |
2727 | } | |
2e09ba09 | 2728 | skip_domain: |
33a2b854 | 2729 | |
5c827ce0 DG |
2730 | /* Validate consumer daemon state when start/stop trace command */ |
2731 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2732 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2733 | switch (cmd_ctx->lsm->domain.type) { | |
2734 | case LTTNG_DOMAIN_UST: | |
2735 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2736 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2737 | goto error; |
2738 | } | |
2739 | break; | |
2740 | case LTTNG_DOMAIN_KERNEL: | |
2741 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2742 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2743 | goto error; |
2744 | } | |
2745 | break; | |
2746 | } | |
2747 | } | |
2748 | ||
8e0af1b4 MD |
2749 | /* |
2750 | * Check that the UID or GID match that of the tracing session. | |
2751 | * The root user can interact with all sessions. | |
2752 | */ | |
2753 | if (need_tracing_session) { | |
2754 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2755 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2756 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2757 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2758 | goto error; |
2759 | } | |
2760 | } | |
2761 | ||
ffe60014 DG |
2762 | /* |
2763 | * Send relayd information to consumer as soon as we have a domain and a | |
2764 | * session defined. | |
2765 | */ | |
2766 | if (cmd_ctx->session && need_domain) { | |
2767 | /* | |
2768 | * Setup relayd if not done yet. If the relayd information was already | |
2769 | * sent to the consumer, this call will gracefully return. | |
2770 | */ | |
2771 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2772 | if (ret != LTTNG_OK) { | |
2773 | goto error; | |
2774 | } | |
2775 | } | |
2776 | ||
54d01ffb DG |
2777 | /* Process by command type */ |
2778 | switch (cmd_ctx->lsm->cmd_type) { | |
2779 | case LTTNG_ADD_CONTEXT: | |
2780 | { | |
2781 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2782 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2783 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2784 | break; |
2785 | } | |
2786 | case LTTNG_DISABLE_CHANNEL: | |
2787 | { | |
2788 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2789 | cmd_ctx->lsm->u.disable.channel_name); | |
2790 | break; | |
2791 | } | |
2792 | case LTTNG_DISABLE_EVENT: | |
2793 | { | |
2794 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2795 | cmd_ctx->lsm->u.disable.channel_name, | |
2796 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2797 | break; |
2798 | } | |
54d01ffb DG |
2799 | case LTTNG_DISABLE_ALL_EVENT: |
2800 | { | |
2bdd86d4 | 2801 | DBG("Disabling all events"); |
54d01ffb DG |
2802 | |
2803 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2804 | cmd_ctx->lsm->u.disable.channel_name); | |
2805 | break; | |
2806 | } | |
2807 | case LTTNG_ENABLE_CHANNEL: | |
2808 | { | |
7972aab2 | 2809 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2810 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2811 | break; |
2812 | } | |
2813 | case LTTNG_ENABLE_EVENT: | |
2814 | { | |
7972aab2 | 2815 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2816 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2817 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2818 | break; |
2819 | } | |
2820 | case LTTNG_ENABLE_ALL_EVENT: | |
2821 | { | |
2bdd86d4 | 2822 | DBG("Enabling all events"); |
54d01ffb | 2823 | |
7972aab2 | 2824 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2825 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2826 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2827 | break; |
2828 | } | |
052da939 | 2829 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2830 | { |
9f19cc17 | 2831 | struct lttng_event *events; |
54d01ffb | 2832 | ssize_t nb_events; |
052da939 | 2833 | |
54d01ffb DG |
2834 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2835 | if (nb_events < 0) { | |
f73fabfd | 2836 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2837 | ret = -nb_events; |
2838 | goto error; | |
2ef84c95 DG |
2839 | } |
2840 | ||
2841 | /* | |
2842 | * Setup lttng message with payload size set to the event list size in | |
2843 | * bytes and then copy list into the llm payload. | |
2844 | */ | |
052da939 | 2845 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2846 | if (ret < 0) { |
052da939 | 2847 | free(events); |
2ef84c95 DG |
2848 | goto setup_error; |
2849 | } | |
2850 | ||
2851 | /* Copy event list into message payload */ | |
9f19cc17 | 2852 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2853 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2854 | |
9f19cc17 | 2855 | free(events); |
2ef84c95 | 2856 | |
f73fabfd | 2857 | ret = LTTNG_OK; |
2ef84c95 DG |
2858 | break; |
2859 | } | |
f37d259d MD |
2860 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2861 | { | |
2862 | struct lttng_event_field *fields; | |
2863 | ssize_t nb_fields; | |
2864 | ||
a4b92340 DG |
2865 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2866 | &fields); | |
f37d259d | 2867 | if (nb_fields < 0) { |
f73fabfd | 2868 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2869 | ret = -nb_fields; |
2870 | goto error; | |
2871 | } | |
2872 | ||
2873 | /* | |
2874 | * Setup lttng message with payload size set to the event list size in | |
2875 | * bytes and then copy list into the llm payload. | |
2876 | */ | |
a4b92340 DG |
2877 | ret = setup_lttng_msg(cmd_ctx, |
2878 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2879 | if (ret < 0) { |
2880 | free(fields); | |
2881 | goto setup_error; | |
2882 | } | |
2883 | ||
2884 | /* Copy event list into message payload */ | |
2885 | memcpy(cmd_ctx->llm->payload, fields, | |
2886 | sizeof(struct lttng_event_field) * nb_fields); | |
2887 | ||
2888 | free(fields); | |
2889 | ||
f73fabfd | 2890 | ret = LTTNG_OK; |
f37d259d MD |
2891 | break; |
2892 | } | |
00e2e675 DG |
2893 | case LTTNG_SET_CONSUMER_URI: |
2894 | { | |
a4b92340 DG |
2895 | size_t nb_uri, len; |
2896 | struct lttng_uri *uris; | |
2897 | ||
2898 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2899 | len = nb_uri * sizeof(struct lttng_uri); | |
2900 | ||
2901 | if (nb_uri == 0) { | |
f73fabfd | 2902 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2903 | goto error; |
2904 | } | |
2905 | ||
2906 | uris = zmalloc(len); | |
2907 | if (uris == NULL) { | |
f73fabfd | 2908 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2909 | goto error; |
2910 | } | |
2911 | ||
2912 | /* Receive variable len data */ | |
77c7c900 | 2913 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2914 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2915 | if (ret <= 0) { | |
2916 | DBG("No URIs received from client... continuing"); | |
2917 | *sock_error = 1; | |
f73fabfd | 2918 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2919 | free(uris); |
a4b92340 DG |
2920 | goto error; |
2921 | } | |
2922 | ||
00e2e675 | 2923 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2924 | nb_uri, uris); |
f73fabfd | 2925 | if (ret != LTTNG_OK) { |
b1d41407 | 2926 | free(uris); |
a4b92340 DG |
2927 | goto error; |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | * XXX: 0 means that this URI should be applied on the session. Should | |
2932 | * be a DOMAIN enuam. | |
2933 | */ | |
2934 | if (cmd_ctx->lsm->domain.type == 0) { | |
2935 | /* Add the URI for the UST session if a consumer is present. */ | |
2936 | if (cmd_ctx->session->ust_session && | |
2937 | cmd_ctx->session->ust_session->consumer) { | |
2938 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2939 | nb_uri, uris); | |
2940 | } else if (cmd_ctx->session->kernel_session && | |
2941 | cmd_ctx->session->kernel_session->consumer) { | |
2942 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2943 | cmd_ctx->session, nb_uri, uris); | |
2944 | } | |
2945 | } | |
2946 | ||
b1d41407 DG |
2947 | free(uris); |
2948 | ||
00e2e675 DG |
2949 | break; |
2950 | } | |
f3ed775e | 2951 | case LTTNG_START_TRACE: |
8c0faa1d | 2952 | { |
54d01ffb | 2953 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2954 | break; |
2955 | } | |
f3ed775e | 2956 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2957 | { |
54d01ffb | 2958 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2959 | break; |
2960 | } | |
5e16da05 MD |
2961 | case LTTNG_CREATE_SESSION: |
2962 | { | |
a4b92340 DG |
2963 | size_t nb_uri, len; |
2964 | struct lttng_uri *uris = NULL; | |
2965 | ||
2966 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2967 | len = nb_uri * sizeof(struct lttng_uri); | |
2968 | ||
2969 | if (nb_uri > 0) { | |
2970 | uris = zmalloc(len); | |
2971 | if (uris == NULL) { | |
f73fabfd | 2972 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2973 | goto error; |
2974 | } | |
2975 | ||
2976 | /* Receive variable len data */ | |
77c7c900 | 2977 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2978 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2979 | if (ret <= 0) { | |
2980 | DBG("No URIs received from client... continuing"); | |
2981 | *sock_error = 1; | |
f73fabfd | 2982 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2983 | free(uris); |
a4b92340 DG |
2984 | goto error; |
2985 | } | |
2986 | ||
2987 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2988 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2989 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2990 | free(uris); |
a4b92340 DG |
2991 | goto error; |
2992 | } | |
2993 | } | |
2994 | ||
2995 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2996 | &cmd_ctx->creds); | |
2997 | ||
b1d41407 DG |
2998 | free(uris); |
2999 | ||
00e2e675 DG |
3000 | break; |
3001 | } | |
5e16da05 MD |
3002 | case LTTNG_DESTROY_SESSION: |
3003 | { | |
2f77fc4b | 3004 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3005 | |
3006 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3007 | cmd_ctx->session = NULL; |
5461b305 | 3008 | break; |
5e16da05 | 3009 | } |
9f19cc17 | 3010 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3011 | { |
54d01ffb DG |
3012 | ssize_t nb_dom; |
3013 | struct lttng_domain *domains; | |
5461b305 | 3014 | |
54d01ffb DG |
3015 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3016 | if (nb_dom < 0) { | |
f73fabfd | 3017 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3018 | ret = -nb_dom; |
3019 | goto error; | |
ce3d728c | 3020 | } |
520ff687 | 3021 | |
54d01ffb | 3022 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3023 | if (ret < 0) { |
ae9c20bc | 3024 | free(domains); |
5461b305 | 3025 | goto setup_error; |
520ff687 | 3026 | } |
57167058 | 3027 | |
54d01ffb DG |
3028 | /* Copy event list into message payload */ |
3029 | memcpy(cmd_ctx->llm->payload, domains, | |
3030 | nb_dom * sizeof(struct lttng_domain)); | |
3031 | ||
3032 | free(domains); | |
5e16da05 | 3033 | |
f73fabfd | 3034 | ret = LTTNG_OK; |
5e16da05 MD |
3035 | break; |
3036 | } | |
9f19cc17 | 3037 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3038 | { |
6775595e | 3039 | int nb_chan; |
54d01ffb DG |
3040 | struct lttng_channel *channels; |
3041 | ||
b551a063 DG |
3042 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3043 | cmd_ctx->session, &channels); | |
54d01ffb | 3044 | if (nb_chan < 0) { |
f73fabfd | 3045 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3046 | ret = -nb_chan; |
3047 | goto error; | |
5461b305 | 3048 | } |
ca95a216 | 3049 | |
54d01ffb | 3050 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3051 | if (ret < 0) { |
ae9c20bc | 3052 | free(channels); |
5461b305 DG |
3053 | goto setup_error; |
3054 | } | |
9f19cc17 | 3055 | |
54d01ffb DG |
3056 | /* Copy event list into message payload */ |
3057 | memcpy(cmd_ctx->llm->payload, channels, | |
3058 | nb_chan * sizeof(struct lttng_channel)); | |
3059 | ||
3060 | free(channels); | |
9f19cc17 | 3061 | |
f73fabfd | 3062 | ret = LTTNG_OK; |
5461b305 | 3063 | break; |
5e16da05 | 3064 | } |
9f19cc17 | 3065 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3066 | { |
b551a063 | 3067 | ssize_t nb_event; |
684d34d2 | 3068 | struct lttng_event *events = NULL; |
9f19cc17 | 3069 | |
b551a063 | 3070 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3071 | cmd_ctx->lsm->u.list.channel_name, &events); |
3072 | if (nb_event < 0) { | |
f73fabfd | 3073 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3074 | ret = -nb_event; |
3075 | goto error; | |
5461b305 | 3076 | } |
ca95a216 | 3077 | |
54d01ffb | 3078 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3079 | if (ret < 0) { |
ae9c20bc | 3080 | free(events); |
5461b305 DG |
3081 | goto setup_error; |
3082 | } | |
9f19cc17 | 3083 | |
54d01ffb DG |
3084 | /* Copy event list into message payload */ |
3085 | memcpy(cmd_ctx->llm->payload, events, | |
3086 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3087 | |
54d01ffb | 3088 | free(events); |
9f19cc17 | 3089 | |
f73fabfd | 3090 | ret = LTTNG_OK; |
5461b305 | 3091 | break; |
5e16da05 MD |
3092 | } |
3093 | case LTTNG_LIST_SESSIONS: | |
3094 | { | |
8e0af1b4 | 3095 | unsigned int nr_sessions; |
5461b305 | 3096 | |
8e0af1b4 | 3097 | session_lock_list(); |
730389d9 DG |
3098 | nr_sessions = lttng_sessions_count( |
3099 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3100 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3101 | |
8e0af1b4 | 3102 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3103 | if (ret < 0) { |
54d01ffb | 3104 | session_unlock_list(); |
5461b305 | 3105 | goto setup_error; |
e065084a | 3106 | } |
5e16da05 | 3107 | |
6c9cc2ab | 3108 | /* Filled the session array */ |
2f77fc4b | 3109 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3110 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3111 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3112 | |
54d01ffb | 3113 | session_unlock_list(); |
5e16da05 | 3114 | |
f73fabfd | 3115 | ret = LTTNG_OK; |
5e16da05 MD |
3116 | break; |
3117 | } | |
d0254c7c MD |
3118 | case LTTNG_CALIBRATE: |
3119 | { | |
54d01ffb DG |
3120 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3121 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3122 | break; |
3123 | } | |
d9800920 DG |
3124 | case LTTNG_REGISTER_CONSUMER: |
3125 | { | |
2f77fc4b DG |
3126 | struct consumer_data *cdata; |
3127 | ||
3128 | switch (cmd_ctx->lsm->domain.type) { | |
3129 | case LTTNG_DOMAIN_KERNEL: | |
3130 | cdata = &kconsumer_data; | |
3131 | break; | |
3132 | default: | |
f73fabfd | 3133 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3134 | goto error; |
3135 | } | |
3136 | ||
54d01ffb | 3137 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3138 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3139 | break; |
3140 | } | |
025faf73 | 3141 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3142 | { |
3143 | struct lttng_filter_bytecode *bytecode; | |
3144 | ||
025faf73 | 3145 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3146 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3147 | goto error; |
3148 | } | |
52df2401 MD |
3149 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3150 | ret = LTTNG_ERR_FILTER_INVAL; | |
3151 | goto error; | |
3152 | } | |
025faf73 | 3153 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3154 | if (!bytecode) { |
f73fabfd | 3155 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3156 | goto error; |
3157 | } | |
3158 | /* Receive var. len. data */ | |
3159 | DBG("Receiving var len data from client ..."); | |
3160 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3161 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3162 | if (ret <= 0) { |
3163 | DBG("Nothing recv() from client var len data... continuing"); | |
3164 | *sock_error = 1; | |
f73fabfd | 3165 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3166 | goto error; |
3167 | } | |
3168 | ||
3169 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3170 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3171 | free(bytecode); |
f73fabfd | 3172 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3173 | goto error; |
3174 | } | |
3175 | ||
7972aab2 | 3176 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3177 | cmd_ctx->lsm->u.enable.channel_name, |
3178 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3179 | break; |
3180 | } | |
6d805429 | 3181 | case LTTNG_DATA_PENDING: |
806e2684 | 3182 | { |
6d805429 | 3183 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3184 | break; |
3185 | } | |
da3c9ec1 DG |
3186 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3187 | { | |
6dc3064a DG |
3188 | struct lttcomm_lttng_output_id reply; |
3189 | ||
3190 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3191 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3192 | if (ret != LTTNG_OK) { | |
3193 | goto error; | |
3194 | } | |
3195 | ||
3196 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3197 | if (ret < 0) { | |
3198 | goto setup_error; | |
3199 | } | |
3200 | ||
3201 | /* Copy output list into message payload */ | |
3202 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3203 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3204 | break; |
3205 | } | |
3206 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3207 | { | |
6dc3064a DG |
3208 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3209 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3210 | break; |
3211 | } | |
3212 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3213 | { | |
6dc3064a DG |
3214 | ssize_t nb_output; |
3215 | struct lttng_snapshot_output *outputs = NULL; | |
3216 | ||
3217 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3218 | if (nb_output < 0) { | |
3219 | ret = -nb_output; | |
3220 | goto error; | |
3221 | } | |
3222 | ||
3223 | ret = setup_lttng_msg(cmd_ctx, | |
3224 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3225 | if (ret < 0) { | |
3226 | free(outputs); | |
3227 | goto setup_error; | |
3228 | } | |
3229 | ||
3230 | if (outputs) { | |
3231 | /* Copy output list into message payload */ | |
3232 | memcpy(cmd_ctx->llm->payload, outputs, | |
3233 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3234 | free(outputs); | |
3235 | } | |
3236 | ||
3237 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3238 | break; |
3239 | } | |
3240 | case LTTNG_SNAPSHOT_RECORD: | |
3241 | { | |
6dc3064a DG |
3242 | ret = cmd_snapshot_record(cmd_ctx->session, |
3243 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3244 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3245 | break; |
3246 | } | |
5e16da05 | 3247 | default: |
f73fabfd | 3248 | ret = LTTNG_ERR_UND; |
5461b305 | 3249 | break; |
fac6795d DG |
3250 | } |
3251 | ||
5461b305 | 3252 | error: |
5461b305 DG |
3253 | if (cmd_ctx->llm == NULL) { |
3254 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3255 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3256 | goto setup_error; |
3257 | } | |
3258 | } | |
54d01ffb | 3259 | /* Set return code */ |
5461b305 | 3260 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3261 | setup_error: |
b5541356 | 3262 | if (cmd_ctx->session) { |
54d01ffb | 3263 | session_unlock(cmd_ctx->session); |
b5541356 | 3264 | } |
256a5576 MD |
3265 | if (need_tracing_session) { |
3266 | session_unlock_list(); | |
3267 | } | |
54d01ffb | 3268 | init_setup_error: |
8028d920 | 3269 | return ret; |
fac6795d DG |
3270 | } |
3271 | ||
44a5e5eb DG |
3272 | /* |
3273 | * Thread managing health check socket. | |
3274 | */ | |
3275 | static void *thread_manage_health(void *data) | |
3276 | { | |
eb4a2943 | 3277 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3278 | uint32_t revents, nb_fd; |
3279 | struct lttng_poll_event events; | |
3280 | struct lttcomm_health_msg msg; | |
3281 | struct lttcomm_health_data reply; | |
3282 | ||
3283 | DBG("[thread] Manage health check started"); | |
3284 | ||
3285 | rcu_register_thread(); | |
3286 | ||
6d737ce4 DG |
3287 | /* We might hit an error path before this is created. */ |
3288 | lttng_poll_init(&events); | |
3cc04881 | 3289 | |
44a5e5eb DG |
3290 | /* Create unix socket */ |
3291 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3292 | if (sock < 0) { | |
3293 | ERR("Unable to create health check Unix socket"); | |
3294 | ret = -1; | |
3295 | goto error; | |
3296 | } | |
3297 | ||
b662582b DG |
3298 | /* |
3299 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3300 | * show must go on. | |
3301 | */ | |
3302 | (void) utils_set_fd_cloexec(sock); | |
3303 | ||
44a5e5eb DG |
3304 | ret = lttcomm_listen_unix_sock(sock); |
3305 | if (ret < 0) { | |
3306 | goto error; | |
3307 | } | |
3308 | ||
3309 | /* | |
3310 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3311 | * more will be added to this poll set. | |
3312 | */ | |
d0b96690 | 3313 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3314 | if (ret < 0) { |
3315 | goto error; | |
3316 | } | |
3317 | ||
3318 | /* Add the application registration socket */ | |
3319 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3320 | if (ret < 0) { | |
3321 | goto error; | |
3322 | } | |
3323 | ||
3324 | while (1) { | |
3325 | DBG("Health check ready"); | |
3326 | ||
44a5e5eb DG |
3327 | /* Inifinite blocking call, waiting for transmission */ |
3328 | restart: | |
3329 | ret = lttng_poll_wait(&events, -1); | |
3330 | if (ret < 0) { | |
3331 | /* | |
3332 | * Restart interrupted system call. | |
3333 | */ | |
3334 | if (errno == EINTR) { | |
3335 | goto restart; | |
3336 | } | |
3337 | goto error; | |
3338 | } | |
3339 | ||
0d9c5d77 DG |
3340 | nb_fd = ret; |
3341 | ||
44a5e5eb DG |
3342 | for (i = 0; i < nb_fd; i++) { |
3343 | /* Fetch once the poll data */ | |
3344 | revents = LTTNG_POLL_GETEV(&events, i); | |
3345 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3346 | ||
3347 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3348 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3349 | if (ret) { |
139ac872 MD |
3350 | err = 0; |
3351 | goto exit; | |
44a5e5eb DG |
3352 | } |
3353 | ||
3354 | /* Event on the registration socket */ | |
3355 | if (pollfd == sock) { | |
3356 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3357 | ERR("Health socket poll error"); | |
3358 | goto error; | |
3359 | } | |
3360 | } | |
3361 | } | |
3362 | ||
3363 | new_sock = lttcomm_accept_unix_sock(sock); | |
3364 | if (new_sock < 0) { | |
3365 | goto error; | |
3366 | } | |
3367 | ||
b662582b DG |
3368 | /* |
3369 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3370 | * show must go on. | |
3371 | */ | |
3372 | (void) utils_set_fd_cloexec(new_sock); | |
3373 | ||
44a5e5eb DG |
3374 | DBG("Receiving data from client for health..."); |
3375 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3376 | if (ret <= 0) { | |
3377 | DBG("Nothing recv() from client... continuing"); | |
3378 | ret = close(new_sock); | |
3379 | if (ret) { | |
3380 | PERROR("close"); | |
3381 | } | |
3382 | new_sock = -1; | |
3383 | continue; | |
3384 | } | |
3385 | ||
3386 | rcu_thread_online(); | |
3387 | ||
3388 | switch (msg.component) { | |
3389 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3390 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3391 | break; |
139ac872 | 3392 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3393 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3394 | break; |
44a5e5eb | 3395 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3396 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3397 | break; |
3398 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3399 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3400 | break; |
3401 | case LTTNG_HEALTH_CONSUMER: | |
3402 | reply.ret_code = check_consumer_health(); | |
3403 | break; | |
0b2dc8df MD |
3404 | case LTTNG_HEALTH_HT_CLEANUP: |
3405 | reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP); | |
3406 | break; | |
380e8d6f MD |
3407 | case LTTNG_HEALTH_APP_MANAGE_NOTIFY: |
3408 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY); | |
3409 | break; | |
12e2b881 MD |
3410 | case LTTNG_HEALTH_APP_REG_DISPATCH: |
3411 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
3412 | break; | |
44a5e5eb | 3413 | case LTTNG_HEALTH_ALL: |
44a5e5eb | 3414 | reply.ret_code = |
927ca06a DG |
3415 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3416 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3417 | health_check_state(HEALTH_TYPE_CMD) && | |
3418 | health_check_state(HEALTH_TYPE_KERNEL) && | |
0b2dc8df | 3419 | check_consumer_health() && |
380e8d6f | 3420 | health_check_state(HEALTH_TYPE_HT_CLEANUP) && |
12e2b881 MD |
3421 | health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) && |
3422 | health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
44a5e5eb DG |
3423 | break; |
3424 | default: | |
f73fabfd | 3425 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3426 | break; |
3427 | } | |
3428 | ||
3429 | /* | |
3430 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3431 | * the client where in the sessiond it is the opposite. Again, this is | |
3432 | * just to make things easier for us poor developer which enjoy a lot | |
3433 | * lazyness. | |
3434 | */ | |
3435 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3436 | reply.ret_code = !reply.ret_code; | |
3437 | } | |
3438 | ||
3439 | DBG2("Health check return value %d", reply.ret_code); | |
3440 | ||
3441 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3442 | if (ret < 0) { | |
3443 | ERR("Failed to send health data back to client"); | |
3444 | } | |
3445 | ||
3446 | /* End of transmission */ | |
3447 | ret = close(new_sock); | |
3448 | if (ret) { | |
3449 | PERROR("close"); | |
3450 | } | |
3451 | new_sock = -1; | |
3452 | } | |
3453 | ||
139ac872 | 3454 | exit: |
44a5e5eb | 3455 | error: |
139ac872 MD |
3456 | if (err) { |
3457 | ERR("Health error occurred in %s", __func__); | |
3458 | } | |
44a5e5eb DG |
3459 | DBG("Health check thread dying"); |
3460 | unlink(health_unix_sock_path); | |
3461 | if (sock >= 0) { | |
3462 | ret = close(sock); | |
3463 | if (ret) { | |
3464 | PERROR("close"); | |
3465 | } | |
3466 | } | |
44a5e5eb DG |
3467 | |
3468 | lttng_poll_clean(&events); | |
3469 | ||
3470 | rcu_unregister_thread(); | |
3471 | return NULL; | |
3472 | } | |
3473 | ||
1d4b027a | 3474 | /* |
d063d709 DG |
3475 | * This thread manage all clients request using the unix client socket for |
3476 | * communication. | |
1d4b027a DG |
3477 | */ |
3478 | static void *thread_manage_clients(void *data) | |
3479 | { | |
139ac872 | 3480 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3481 | int sock_error; |
5eb91c98 | 3482 | uint32_t revents, nb_fd; |
273ea72c | 3483 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3484 | struct lttng_poll_event events; |
1d4b027a DG |
3485 | |
3486 | DBG("[thread] Manage client started"); | |
3487 | ||
f6a9efaa DG |
3488 | rcu_register_thread(); |
3489 | ||
927ca06a DG |
3490 | health_register(HEALTH_TYPE_CMD); |
3491 | ||
6993eeb3 CB |
3492 | if (testpoint(thread_manage_clients)) { |
3493 | goto error_testpoint; | |
3494 | } | |
3495 | ||
840cb59c | 3496 | health_code_update(); |
44a5e5eb | 3497 | |
1d4b027a DG |
3498 | ret = lttcomm_listen_unix_sock(client_sock); |
3499 | if (ret < 0) { | |
35df2755 | 3500 | goto error_listen; |
1d4b027a DG |
3501 | } |
3502 | ||
5eb91c98 DG |
3503 | /* |
3504 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3505 | * more will be added to this poll set. | |
3506 | */ | |
d0b96690 | 3507 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3508 | if (ret < 0) { |
35df2755 | 3509 | goto error_create_poll; |
5eb91c98 | 3510 | } |
273ea72c | 3511 | |
5eb91c98 DG |
3512 | /* Add the application registration socket */ |
3513 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3514 | if (ret < 0) { | |
3515 | goto error; | |
3516 | } | |
273ea72c | 3517 | |
bbd973c2 DG |
3518 | /* |
3519 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3520 | */ |
3521 | if (opt_sig_parent) { | |
8db8d1dc | 3522 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3523 | } |
3524 | ||
6993eeb3 CB |
3525 | if (testpoint(thread_manage_clients_before_loop)) { |
3526 | goto error; | |
3527 | } | |
8ac94142 | 3528 | |
840cb59c | 3529 | health_code_update(); |
44a5e5eb | 3530 | |
1d4b027a | 3531 | while (1) { |
1d4b027a | 3532 | DBG("Accepting client command ..."); |
273ea72c DG |
3533 | |
3534 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3535 | restart: |
a78af745 | 3536 | health_poll_entry(); |
5eb91c98 | 3537 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3538 | health_poll_exit(); |
273ea72c | 3539 | if (ret < 0) { |
88f2b785 MD |
3540 | /* |
3541 | * Restart interrupted system call. | |
3542 | */ | |
3543 | if (errno == EINTR) { | |
3544 | goto restart; | |
3545 | } | |
273ea72c DG |
3546 | goto error; |
3547 | } | |
3548 | ||
0d9c5d77 DG |
3549 | nb_fd = ret; |
3550 | ||
5eb91c98 DG |
3551 | for (i = 0; i < nb_fd; i++) { |
3552 | /* Fetch once the poll data */ | |
3553 | revents = LTTNG_POLL_GETEV(&events, i); | |
3554 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3555 | ||
840cb59c | 3556 | health_code_update(); |
44a5e5eb | 3557 | |
5eb91c98 | 3558 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3559 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3560 | if (ret) { |
139ac872 MD |
3561 | err = 0; |
3562 | goto exit; | |
5eb91c98 DG |
3563 | } |
3564 | ||
3565 | /* Event on the registration socket */ | |
3566 | if (pollfd == client_sock) { | |
3567 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3568 | ERR("Client socket poll error"); | |
3569 | goto error; | |
3570 | } | |
3571 | } | |
3572 | } | |
3573 | ||
3574 | DBG("Wait for client response"); | |
3575 | ||
840cb59c | 3576 | health_code_update(); |
44a5e5eb | 3577 | |
5eb91c98 DG |
3578 | sock = lttcomm_accept_unix_sock(client_sock); |
3579 | if (sock < 0) { | |
273ea72c | 3580 | goto error; |
273ea72c DG |
3581 | } |
3582 | ||
b662582b DG |
3583 | /* |
3584 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3585 | * show must go on. | |
3586 | */ | |
3587 | (void) utils_set_fd_cloexec(sock); | |
3588 | ||
be040666 DG |
3589 | /* Set socket option for credentials retrieval */ |
3590 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3591 | if (ret < 0) { | |
3592 | goto error; | |
3593 | } | |
3594 | ||
5eb91c98 | 3595 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3596 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3597 | if (cmd_ctx == NULL) { |
76d7553f | 3598 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3599 | goto error; |
5eb91c98 | 3600 | } |
1d4b027a | 3601 | |
5eb91c98 | 3602 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3603 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3604 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3605 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3606 | goto error; |
3607 | } | |
1d4b027a | 3608 | |
5eb91c98 DG |
3609 | cmd_ctx->llm = NULL; |
3610 | cmd_ctx->session = NULL; | |
1d4b027a | 3611 | |
840cb59c | 3612 | health_code_update(); |
44a5e5eb | 3613 | |
5eb91c98 DG |
3614 | /* |
3615 | * Data is received from the lttng client. The struct | |
3616 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3617 | * the client. | |
3618 | */ | |
3619 | DBG("Receiving data from client ..."); | |
be040666 DG |
3620 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3621 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3622 | if (ret <= 0) { |
3623 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3624 | ret = close(sock); |
3625 | if (ret) { | |
3626 | PERROR("close"); | |
3627 | } | |
3628 | sock = -1; | |
a2c0da86 | 3629 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3630 | continue; |
3631 | } | |
1d4b027a | 3632 | |
840cb59c | 3633 | health_code_update(); |
44a5e5eb | 3634 | |
5eb91c98 DG |
3635 | // TODO: Validate cmd_ctx including sanity check for |
3636 | // security purpose. | |
f7776ea7 | 3637 | |
f6a9efaa | 3638 | rcu_thread_online(); |
5eb91c98 DG |
3639 | /* |
3640 | * This function dispatch the work to the kernel or userspace tracer | |
3641 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3642 | * informations for the client. The command context struct contains | |
3643 | * everything this function may needs. | |
3644 | */ | |
53a80697 | 3645 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3646 | rcu_thread_offline(); |
5eb91c98 | 3647 | if (ret < 0) { |
36134aa1 DG |
3648 | ret = close(sock); |
3649 | if (ret) { | |
3650 | PERROR("close"); | |
53a80697 | 3651 | } |
36134aa1 | 3652 | sock = -1; |
bbd973c2 | 3653 | /* |
5eb91c98 | 3654 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3655 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3656 | * (ENOMEM). Error detected but still accept |
3657 | * command, unless a socket error has been | |
3658 | * detected. | |
bbd973c2 | 3659 | */ |
bbd973c2 | 3660 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3661 | continue; |
3662 | } | |
d6e4fca4 | 3663 | |
840cb59c | 3664 | health_code_update(); |
44a5e5eb | 3665 | |
54d01ffb DG |
3666 | DBG("Sending response (size: %d, retcode: %s)", |
3667 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3668 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3669 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3670 | if (ret < 0) { |
3671 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3672 | } |
1d4b027a | 3673 | |
5eb91c98 | 3674 | /* End of transmission */ |
76d7553f MD |
3675 | ret = close(sock); |
3676 | if (ret) { | |
3677 | PERROR("close"); | |
3678 | } | |
3679 | sock = -1; | |
be040666 DG |
3680 | |
3681 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3682 | |
840cb59c | 3683 | health_code_update(); |
273ea72c DG |
3684 | } |
3685 | ||
139ac872 | 3686 | exit: |
5eb91c98 | 3687 | error: |
35df2755 CB |
3688 | if (sock >= 0) { |
3689 | ret = close(sock); | |
3690 | if (ret) { | |
3691 | PERROR("close"); | |
3692 | } | |
139ac872 | 3693 | } |
44a5e5eb | 3694 | |
35df2755 CB |
3695 | lttng_poll_clean(&events); |
3696 | clean_command_ctx(&cmd_ctx); | |
3697 | ||
3698 | error_listen: | |
3699 | error_create_poll: | |
6993eeb3 | 3700 | error_testpoint: |
273ea72c | 3701 | unlink(client_unix_sock_path); |
76d7553f MD |
3702 | if (client_sock >= 0) { |
3703 | ret = close(client_sock); | |
3704 | if (ret) { | |
3705 | PERROR("close"); | |
3706 | } | |
a4b35e07 | 3707 | } |
35df2755 CB |
3708 | |
3709 | if (err) { | |
840cb59c | 3710 | health_error(); |
35df2755 | 3711 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3712 | } |
273ea72c | 3713 | |
927ca06a | 3714 | health_unregister(); |
35df2755 CB |
3715 | |
3716 | DBG("Client thread dying"); | |
f6a9efaa DG |
3717 | |
3718 | rcu_unregister_thread(); | |
1d4b027a DG |
3719 | return NULL; |
3720 | } | |
3721 | ||
3722 | ||
fac6795d DG |
3723 | /* |
3724 | * usage function on stderr | |
3725 | */ | |
3726 | static void usage(void) | |
3727 | { | |
b716ce68 | 3728 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3729 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3730 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3731 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3732 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3733 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3734 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3735 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3736 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3737 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3738 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3739 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3740 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3741 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3742 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3743 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3744 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3745 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3746 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3747 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3748 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3749 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3750 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3751 | } |
3752 | ||
3753 | /* | |
3754 | * daemon argument parsing | |
3755 | */ | |
3756 | static int parse_args(int argc, char **argv) | |
3757 | { | |
3758 | int c; | |
3759 | ||
3760 | static struct option long_options[] = { | |
3761 | { "client-sock", 1, 0, 'c' }, | |
3762 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3763 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3764 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3765 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3766 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3767 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3768 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3769 | { "consumerd32-path", 1, 0, 'u' }, | |
3770 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3771 | { "consumerd64-path", 1, 0, 't' }, | |
3772 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3773 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3774 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3775 | { "help", 0, 0, 'h' }, |
3776 | { "group", 1, 0, 'g' }, | |
3777 | { "version", 0, 0, 'V' }, | |
75462a81 | 3778 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3779 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3780 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3781 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3782 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3783 | { NULL, 0, 0, 0 } |
3784 | }; | |
3785 | ||
3786 | while (1) { | |
3787 | int option_index = 0; | |
35f90c40 | 3788 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3789 | long_options, &option_index); |
fac6795d DG |
3790 | if (c == -1) { |
3791 | break; | |
3792 | } | |
3793 | ||
3794 | switch (c) { | |
3795 | case 0: | |
3796 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3797 | if (optarg) { | |
3798 | fprintf(stderr, " with arg %s\n", optarg); | |
3799 | } | |
3800 | break; | |
b716ce68 | 3801 | case 'c': |
fac6795d DG |
3802 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3803 | break; | |
3804 | case 'a': | |
3805 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3806 | break; | |
3807 | case 'd': | |
3808 | opt_daemon = 1; | |
3809 | break; | |
3810 | case 'g': | |
fb09408a | 3811 | opt_tracing_group = optarg; |
fac6795d DG |
3812 | break; |
3813 | case 'h': | |
3814 | usage(); | |
3815 | exit(EXIT_FAILURE); | |
3816 | case 'V': | |
3817 | fprintf(stdout, "%s\n", VERSION); | |
3818 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3819 | case 'S': |
3820 | opt_sig_parent = 1; | |
3821 | break; | |
d6f42150 | 3822 | case 'E': |
3bd1e081 | 3823 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3824 | break; |
3825 | case 'C': | |
3bd1e081 MD |
3826 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3827 | break; | |
3828 | case 'F': | |
7753dea8 | 3829 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3830 | break; |
3831 | case 'D': | |
7753dea8 MD |
3832 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3833 | break; | |
3834 | case 'H': | |
3835 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3836 | break; | |
3837 | case 'G': | |
3838 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3839 | break; |
4fba7219 DG |
3840 | case 'N': |
3841 | opt_no_kernel = 1; | |
3842 | break; | |
75462a81 | 3843 | case 'q': |
97e19046 | 3844 | lttng_opt_quiet = 1; |
75462a81 | 3845 | break; |
3f9947db | 3846 | case 'v': |
53086306 | 3847 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3848 | lttng_opt_verbose += 1; |
3f9947db | 3849 | break; |
31f73cc9 | 3850 | case 'Z': |
3bd1e081 | 3851 | opt_verbose_consumer += 1; |
31f73cc9 | 3852 | break; |
fb09408a | 3853 | case 'u': |
fc7a59ce | 3854 | consumerd32_bin= optarg; |
ebaeda94 MD |
3855 | break; |
3856 | case 'U': | |
3857 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3858 | break; |
3859 | case 't': | |
fc7a59ce | 3860 | consumerd64_bin = optarg; |
ebaeda94 MD |
3861 | break; |
3862 | case 'T': | |
3863 | consumerd64_libdir = optarg; | |
fb09408a | 3864 | break; |
35f90c40 DG |
3865 | case 'p': |
3866 | opt_pidfile = optarg; | |
3867 | break; | |
fac6795d DG |
3868 | default: |
3869 | /* Unknown option or other error. | |
3870 | * Error is printed by getopt, just return */ | |
3871 | return -1; | |
3872 | } | |
3873 | } | |
3874 | ||
3875 | return 0; | |
3876 | } | |
3877 | ||
3878 | /* | |
d063d709 | 3879 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3880 | * apps_sock - The communication socket for all UST apps. |
3881 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3882 | */ |
cf3af59e | 3883 | static int init_daemon_socket(void) |
fac6795d DG |
3884 | { |
3885 | int ret = 0; | |
3886 | mode_t old_umask; | |
3887 | ||
3888 | old_umask = umask(0); | |
3889 | ||
3890 | /* Create client tool unix socket */ | |
d6f42150 DG |
3891 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3892 | if (client_sock < 0) { | |
3893 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3894 | ret = -1; |
3895 | goto end; | |
3896 | } | |
3897 | ||
b662582b DG |
3898 | /* Set the cloexec flag */ |
3899 | ret = utils_set_fd_cloexec(client_sock); | |
3900 | if (ret < 0) { | |
3901 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3902 | "Continuing but note that the consumer daemon will have a " | |
3903 | "reference to this socket on exec()", client_sock); | |
3904 | } | |
3905 | ||
fac6795d DG |
3906 | /* File permission MUST be 660 */ |
3907 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3908 | if (ret < 0) { | |
d6f42150 | 3909 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3910 | PERROR("chmod"); |
fac6795d DG |
3911 | goto end; |
3912 | } | |
3913 | ||
3914 | /* Create the application unix socket */ | |
d6f42150 DG |
3915 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3916 | if (apps_sock < 0) { | |
3917 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3918 | ret = -1; |
3919 | goto end; | |
3920 | } | |
3921 | ||
b662582b DG |
3922 | /* Set the cloexec flag */ |
3923 | ret = utils_set_fd_cloexec(apps_sock); | |
3924 | if (ret < 0) { | |
3925 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3926 | "Continuing but note that the consumer daemon will have a " | |
3927 | "reference to this socket on exec()", apps_sock); | |
3928 | } | |
3929 | ||
d6f42150 | 3930 | /* File permission MUST be 666 */ |
54d01ffb DG |
3931 | ret = chmod(apps_unix_sock_path, |
3932 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3933 | if (ret < 0) { |
d6f42150 | 3934 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3935 | PERROR("chmod"); |
fac6795d DG |
3936 | goto end; |
3937 | } | |
3938 | ||
b662582b DG |
3939 | DBG3("Session daemon client socket %d and application socket %d created", |
3940 | client_sock, apps_sock); | |
3941 | ||
fac6795d DG |
3942 | end: |
3943 | umask(old_umask); | |
3944 | return ret; | |
3945 | } | |
3946 | ||
3947 | /* | |
54d01ffb DG |
3948 | * Check if the global socket is available, and if a daemon is answering at the |
3949 | * other side. If yes, error is returned. | |
fac6795d | 3950 | */ |
cf3af59e | 3951 | static int check_existing_daemon(void) |
fac6795d | 3952 | { |
7d8234d9 | 3953 | /* Is there anybody out there ? */ |
099e26bd | 3954 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3955 | return -EEXIST; |
099e26bd | 3956 | } |
b09c7c76 DG |
3957 | |
3958 | return 0; | |
fac6795d DG |
3959 | } |
3960 | ||
fac6795d | 3961 | /* |
d063d709 | 3962 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3963 | * |
d063d709 | 3964 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3965 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3966 | */ |
be040666 | 3967 | static int set_permissions(char *rundir) |
fac6795d DG |
3968 | { |
3969 | int ret; | |
996b65c8 | 3970 | gid_t gid; |
fac6795d | 3971 | |
6775595e DG |
3972 | ret = allowed_group(); |
3973 | if (ret < 0) { | |
be040666 DG |
3974 | WARN("No tracing group detected"); |
3975 | ret = 0; | |
fac6795d DG |
3976 | goto end; |
3977 | } | |
3978 | ||
6775595e DG |
3979 | gid = ret; |
3980 | ||
d6f42150 | 3981 | /* Set lttng run dir */ |
be040666 | 3982 | ret = chown(rundir, 0, gid); |
d6f42150 | 3983 | if (ret < 0) { |
be040666 | 3984 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3985 | PERROR("chown"); |
d6f42150 DG |
3986 | } |
3987 | ||
d1613cf5 | 3988 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3989 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3990 | if (ret < 0) { |
3991 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3992 | PERROR("chmod"); |
d1613cf5 JN |
3993 | } |
3994 | ||
d6f42150 | 3995 | /* lttng client socket path */ |
996b65c8 | 3996 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3997 | if (ret < 0) { |
d6f42150 | 3998 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3999 | PERROR("chown"); |
d6f42150 DG |
4000 | } |
4001 | ||
3bd1e081 MD |
4002 | /* kconsumer error socket path */ |
4003 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4004 | if (ret < 0) { |
3bd1e081 | 4005 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4006 | PERROR("chown"); |
3bd1e081 MD |
4007 | } |
4008 | ||
7753dea8 MD |
4009 | /* 64-bit ustconsumer error socket path */ |
4010 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4011 | if (ret < 0) { | |
4012 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4013 | PERROR("chown"); |
7753dea8 MD |
4014 | } |
4015 | ||
4016 | /* 32-bit ustconsumer compat32 error socket path */ | |
4017 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4018 | if (ret < 0) { |
7753dea8 | 4019 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4020 | PERROR("chown"); |
fac6795d DG |
4021 | } |
4022 | ||
d6f42150 | 4023 | DBG("All permissions are set"); |
e07ae692 | 4024 | |
fac6795d DG |
4025 | end: |
4026 | return ret; | |
4027 | } | |
4028 | ||
d6f42150 | 4029 | /* |
d063d709 | 4030 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4031 | */ |
67e40797 | 4032 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4033 | { |
4034 | int ret; | |
4035 | ||
67e40797 DG |
4036 | DBG3("Creating LTTng run directory: %s", rundir); |
4037 | ||
d1613cf5 | 4038 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4039 | if (ret < 0) { |
b1f11e69 | 4040 | if (errno != EEXIST) { |
67e40797 | 4041 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4042 | goto error; |
4043 | } else { | |
4044 | ret = 0; | |
4045 | } | |
d6f42150 DG |
4046 | } |
4047 | ||
4048 | error: | |
4049 | return ret; | |
4050 | } | |
4051 | ||
4052 | /* | |
d063d709 DG |
4053 | * Setup sockets and directory needed by the kconsumerd communication with the |
4054 | * session daemon. | |
d6f42150 | 4055 | */ |
67e40797 DG |
4056 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4057 | const char *rundir) | |
d6f42150 DG |
4058 | { |
4059 | int ret; | |
67e40797 | 4060 | char path[PATH_MAX]; |
d6f42150 | 4061 | |
67e40797 | 4062 | switch (consumer_data->type) { |
7753dea8 | 4063 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4064 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4065 | break; |
4066 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4067 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4068 | break; |
4069 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4070 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4071 | break; |
4072 | default: | |
4073 | ERR("Consumer type unknown"); | |
4074 | ret = -EINVAL; | |
4075 | goto error; | |
d6f42150 DG |
4076 | } |
4077 | ||
67e40797 DG |
4078 | DBG2("Creating consumer directory: %s", path); |
4079 | ||
d1613cf5 | 4080 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4081 | if (ret < 0) { |
6beb2242 | 4082 | if (errno != EEXIST) { |
f11e84c2 | 4083 | PERROR("mkdir"); |
3bd1e081 | 4084 | ERR("Failed to create %s", path); |
6beb2242 DG |
4085 | goto error; |
4086 | } | |
f11e84c2 | 4087 | ret = -1; |
d6f42150 DG |
4088 | } |
4089 | ||
4090 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4091 | consumer_data->err_sock = |
4092 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4093 | if (consumer_data->err_sock < 0) { | |
4094 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4095 | ret = -1; |
4096 | goto error; | |
4097 | } | |
4098 | ||
4099 | /* File permission MUST be 660 */ | |
3bd1e081 | 4100 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4101 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4102 | if (ret < 0) { |
3bd1e081 | 4103 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4104 | PERROR("chmod"); |
d6f42150 DG |
4105 | goto error; |
4106 | } | |
4107 | ||
4108 | error: | |
4109 | return ret; | |
4110 | } | |
4111 | ||
fac6795d | 4112 | /* |
d063d709 | 4113 | * Signal handler for the daemon |
cf3af59e | 4114 | * |
54d01ffb DG |
4115 | * Simply stop all worker threads, leaving main() return gracefully after |
4116 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4117 | */ |
4118 | static void sighandler(int sig) | |
4119 | { | |
4120 | switch (sig) { | |
cf3af59e | 4121 | case SIGPIPE: |
af87c45a | 4122 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4123 | return; |
4124 | case SIGINT: | |
af87c45a | 4125 | DBG("SIGINT caught"); |
cf3af59e MD |
4126 | stop_threads(); |
4127 | break; | |
4128 | case SIGTERM: | |
af87c45a | 4129 | DBG("SIGTERM caught"); |
cf3af59e MD |
4130 | stop_threads(); |
4131 | break; | |
4132 | default: | |
4133 | break; | |
fac6795d | 4134 | } |
fac6795d DG |
4135 | } |
4136 | ||
4137 | /* | |
d063d709 | 4138 | * Setup signal handler for : |
1d4b027a | 4139 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4140 | */ |
1d4b027a | 4141 | static int set_signal_handler(void) |
fac6795d | 4142 | { |
1d4b027a DG |
4143 | int ret = 0; |
4144 | struct sigaction sa; | |
4145 | sigset_t sigset; | |
fac6795d | 4146 | |
1d4b027a | 4147 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4148 | PERROR("sigemptyset"); |
1d4b027a DG |
4149 | return ret; |
4150 | } | |
d6f42150 | 4151 | |
1d4b027a DG |
4152 | sa.sa_handler = sighandler; |
4153 | sa.sa_mask = sigset; | |
4154 | sa.sa_flags = 0; | |
4155 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4156 | PERROR("sigaction"); |
1d4b027a | 4157 | return ret; |
d6f42150 DG |
4158 | } |
4159 | ||
1d4b027a | 4160 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4161 | PERROR("sigaction"); |
1d4b027a | 4162 | return ret; |
d6f42150 | 4163 | } |
aaf26714 | 4164 | |
1d4b027a | 4165 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4166 | PERROR("sigaction"); |
1d4b027a | 4167 | return ret; |
8c0faa1d DG |
4168 | } |
4169 | ||
1d4b027a DG |
4170 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4171 | ||
4172 | return ret; | |
fac6795d DG |
4173 | } |
4174 | ||
f3ed775e | 4175 | /* |
d063d709 DG |
4176 | * Set open files limit to unlimited. This daemon can open a large number of |
4177 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4178 | */ |
4179 | static void set_ulimit(void) | |
4180 | { | |
4181 | int ret; | |
4182 | struct rlimit lim; | |
4183 | ||
a88df331 | 4184 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4185 | lim.rlim_cur = 65535; |
4186 | lim.rlim_max = 65535; | |
4187 | ||
4188 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4189 | if (ret < 0) { | |
76d7553f | 4190 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4191 | } |
4192 | } | |
4193 | ||
35f90c40 DG |
4194 | /* |
4195 | * Write pidfile using the rundir and opt_pidfile. | |
4196 | */ | |
4197 | static void write_pidfile(void) | |
4198 | { | |
4199 | int ret; | |
4200 | char pidfile_path[PATH_MAX]; | |
4201 | ||
4202 | assert(rundir); | |
4203 | ||
4204 | if (opt_pidfile) { | |
4205 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4206 | } else { | |
4207 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4208 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4209 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4210 | if (ret < 0) { | |
4211 | PERROR("snprintf pidfile path"); | |
4212 | goto error; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | /* | |
4217 | * Create pid file in rundir. Return value is of no importance. The | |
4218 | * execution will continue even though we are not able to write the file. | |
4219 | */ | |
4220 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4221 | ||
4222 | error: | |
4223 | return; | |
4224 | } | |
4225 | ||
fac6795d DG |
4226 | /* |
4227 | * main | |
4228 | */ | |
4229 | int main(int argc, char **argv) | |
4230 | { | |
fac6795d DG |
4231 | int ret = 0; |
4232 | void *status; | |
ae9e45b3 | 4233 | const char *home_path, *env_app_timeout; |
fac6795d | 4234 | |
335a95b7 MD |
4235 | init_kernel_workarounds(); |
4236 | ||
f6a9efaa DG |
4237 | rcu_register_thread(); |
4238 | ||
7753dea8 | 4239 | setup_consumerd_path(); |
fb09408a | 4240 | |
12744796 DG |
4241 | page_size = sysconf(_SC_PAGESIZE); |
4242 | if (page_size < 0) { | |
4243 | PERROR("sysconf _SC_PAGESIZE"); | |
4244 | page_size = LONG_MAX; | |
4245 | WARN("Fallback page size to %ld", page_size); | |
4246 | } | |
4247 | ||
fac6795d DG |
4248 | /* Parse arguments */ |
4249 | progname = argv[0]; | |
c617c0c6 | 4250 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4251 | goto error; |
fac6795d DG |
4252 | } |
4253 | ||
4254 | /* Daemonize */ | |
4255 | if (opt_daemon) { | |
ceed52b5 MD |
4256 | int i; |
4257 | ||
4258 | /* | |
4259 | * fork | |
4260 | * child: setsid, close FD 0, 1, 2, chdir / | |
4261 | * parent: exit (if fork is successful) | |
4262 | */ | |
53094c05 DG |
4263 | ret = daemon(0, 0); |
4264 | if (ret < 0) { | |
76d7553f | 4265 | PERROR("daemon"); |
cf3af59e | 4266 | goto error; |
53094c05 | 4267 | } |
ceed52b5 MD |
4268 | /* |
4269 | * We are in the child. Make sure all other file | |
4270 | * descriptors are closed, in case we are called with | |
4271 | * more opened file descriptors than the standard ones. | |
4272 | */ | |
4273 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4274 | (void) close(i); | |
4275 | } | |
4276 | } | |
4277 | ||
4278 | /* Create thread quit pipe */ | |
4279 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4280 | goto error; | |
fac6795d DG |
4281 | } |
4282 | ||
4283 | /* Check if daemon is UID = 0 */ | |
4284 | is_root = !getuid(); | |
4285 | ||
fac6795d | 4286 | if (is_root) { |
990570ed | 4287 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4288 | |
4289 | /* Create global run dir with root access */ | |
4290 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4291 | if (ret < 0) { |
cf3af59e | 4292 | goto error; |
d6f42150 DG |
4293 | } |
4294 | ||
fac6795d | 4295 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4296 | snprintf(apps_unix_sock_path, PATH_MAX, |
4297 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4298 | } |
4299 | ||
4300 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4301 | snprintf(client_unix_sock_path, PATH_MAX, |
4302 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4303 | } | |
0fdd1e2c DG |
4304 | |
4305 | /* Set global SHM for ust */ | |
4306 | if (strlen(wait_shm_path) == 0) { | |
4307 | snprintf(wait_shm_path, PATH_MAX, | |
4308 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4309 | } | |
67e40797 | 4310 | |
44a5e5eb DG |
4311 | if (strlen(health_unix_sock_path) == 0) { |
4312 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4313 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4314 | } | |
4315 | ||
67e40797 DG |
4316 | /* Setup kernel consumerd path */ |
4317 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4318 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4319 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4320 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4321 | |
4322 | DBG2("Kernel consumer err path: %s", | |
4323 | kconsumer_data.err_unix_sock_path); | |
4324 | DBG2("Kernel consumer cmd path: %s", | |
4325 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4326 | } else { |
feb0f3e5 | 4327 | home_path = utils_get_home_dir(); |
b082db07 | 4328 | if (home_path == NULL) { |
273ea72c DG |
4329 | /* TODO: Add --socket PATH option */ |
4330 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4331 | ret = -EPERM; |
4332 | goto error; | |
b082db07 DG |
4333 | } |
4334 | ||
67e40797 DG |
4335 | /* |
4336 | * Create rundir from home path. This will create something like | |
4337 | * $HOME/.lttng | |
4338 | */ | |
990570ed | 4339 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4340 | if (ret < 0) { |
4341 | ret = -ENOMEM; | |
4342 | goto error; | |
4343 | } | |
4344 | ||
4345 | ret = create_lttng_rundir(rundir); | |
4346 | if (ret < 0) { | |
4347 | goto error; | |
4348 | } | |
4349 | ||
fac6795d | 4350 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4351 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4352 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4353 | } |
4354 | ||
4355 | /* Set the cli tool unix socket path */ | |
4356 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4357 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4358 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4359 | } |
0fdd1e2c DG |
4360 | |
4361 | /* Set global SHM for ust */ | |
4362 | if (strlen(wait_shm_path) == 0) { | |
4363 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4364 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4365 | } |
44a5e5eb DG |
4366 | |
4367 | /* Set health check Unix path */ | |
4368 | if (strlen(health_unix_sock_path) == 0) { | |
4369 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4370 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4371 | } | |
fac6795d DG |
4372 | } |
4373 | ||
5c827ce0 DG |
4374 | /* Set consumer initial state */ |
4375 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4376 | ust_consumerd_state = CONSUMER_STOPPED; | |
4377 | ||
847177cd DG |
4378 | DBG("Client socket path %s", client_unix_sock_path); |
4379 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4380 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4381 | DBG("LTTng run directory path: %s", rundir); |
4382 | ||
4383 | /* 32 bits consumerd path setup */ | |
4384 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4385 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4386 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4387 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4388 | |
4389 | DBG2("UST consumer 32 bits err path: %s", | |
4390 | ustconsumer32_data.err_unix_sock_path); | |
4391 | DBG2("UST consumer 32 bits cmd path: %s", | |
4392 | ustconsumer32_data.cmd_unix_sock_path); | |
4393 | ||
4394 | /* 64 bits consumerd path setup */ | |
4395 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4396 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4397 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4398 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4399 | |
4400 | DBG2("UST consumer 64 bits err path: %s", | |
4401 | ustconsumer64_data.err_unix_sock_path); | |
4402 | DBG2("UST consumer 64 bits cmd path: %s", | |
4403 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4404 | |
273ea72c | 4405 | /* |
7d8234d9 | 4406 | * See if daemon already exist. |
fac6795d | 4407 | */ |
7d8234d9 | 4408 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4409 | ERR("Already running daemon.\n"); |
273ea72c | 4410 | /* |
cf3af59e MD |
4411 | * We do not goto exit because we must not cleanup() |
4412 | * because a daemon is already running. | |
ab118b20 | 4413 | */ |
cf3af59e | 4414 | goto error; |
a88df331 DG |
4415 | } |
4416 | ||
1427f9b2 DG |
4417 | /* |
4418 | * Init UST app hash table. Alloc hash table before this point since | |
4419 | * cleanup() can get called after that point. | |
4420 | */ | |
4421 | ust_app_ht_alloc(); | |
4422 | ||
54d01ffb | 4423 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4424 | |
4425 | /* | |
4426 | * These actions must be executed as root. We do that *after* setting up | |
4427 | * the sockets path because we MUST make the check for another daemon using | |
4428 | * those paths *before* trying to set the kernel consumer sockets and init | |
4429 | * kernel tracer. | |
4430 | */ | |
4431 | if (is_root) { | |
67e40797 | 4432 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4433 | if (ret < 0) { |
4434 | goto exit; | |
4435 | } | |
4436 | ||
a88df331 | 4437 | /* Setup kernel tracer */ |
4fba7219 DG |
4438 | if (!opt_no_kernel) { |
4439 | init_kernel_tracer(); | |
4440 | } | |
a88df331 DG |
4441 | |
4442 | /* Set ulimit for open files */ | |
4443 | set_ulimit(); | |
fac6795d | 4444 | } |
4063050c MD |
4445 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4446 | lttng_fd_init(); | |
fac6795d | 4447 | |
67e40797 DG |
4448 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4449 | if (ret < 0) { | |
4450 | goto exit; | |
4451 | } | |
4452 | ||
4453 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4454 | if (ret < 0) { | |
4455 | goto exit; | |
4456 | } | |
4457 | ||
cf3af59e MD |
4458 | if ((ret = set_signal_handler()) < 0) { |
4459 | goto exit; | |
fac6795d DG |
4460 | } |
4461 | ||
d6f42150 | 4462 | /* Setup the needed unix socket */ |
cf3af59e MD |
4463 | if ((ret = init_daemon_socket()) < 0) { |
4464 | goto exit; | |
fac6795d DG |
4465 | } |
4466 | ||
4467 | /* Set credentials to socket */ | |
be040666 | 4468 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4469 | goto exit; |
fac6795d DG |
4470 | } |
4471 | ||
5b8719f5 DG |
4472 | /* Get parent pid if -S, --sig-parent is specified. */ |
4473 | if (opt_sig_parent) { | |
4474 | ppid = getppid(); | |
4475 | } | |
4476 | ||
7a485870 | 4477 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4478 | if (is_root && !opt_no_kernel) { |
4479 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4480 | goto exit; | |
4481 | } | |
7a485870 DG |
4482 | } |
4483 | ||
0b2dc8df MD |
4484 | /* Setup the thread ht_cleanup communication pipe. */ |
4485 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4486 | goto exit; | |
4487 | } | |
4488 | ||
099e26bd | 4489 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4490 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4491 | goto exit; |
4492 | } | |
4493 | ||
d0b96690 DG |
4494 | /* Setup the thread apps notify communication pipe. */ |
4495 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4496 | goto exit; | |
4497 | } | |
4498 | ||
7972aab2 DG |
4499 | /* Initialize global buffer per UID and PID registry. */ |
4500 | buffer_reg_init_uid_registry(); | |
4501 | buffer_reg_init_pid_registry(); | |
4502 | ||
099e26bd DG |
4503 | /* Init UST command queue. */ |
4504 | cds_wfq_init(&ust_cmd_queue.queue); | |
4505 | ||
273ea72c | 4506 | /* |
54d01ffb DG |
4507 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4508 | * statically declared in session.c | |
273ea72c | 4509 | */ |
54d01ffb | 4510 | session_list_ptr = session_get_list(); |
b5541356 | 4511 | |
5eb91c98 DG |
4512 | /* Set up max poll set size */ |
4513 | lttng_poll_set_max_size(); | |
4514 | ||
2f77fc4b | 4515 | cmd_init(); |
00e2e675 | 4516 | |
ae9e45b3 DG |
4517 | /* Check for the application socket timeout env variable. */ |
4518 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4519 | if (env_app_timeout) { | |
4520 | app_socket_timeout = atoi(env_app_timeout); | |
4521 | } else { | |
4522 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4523 | } | |
4524 | ||
35f90c40 DG |
4525 | write_pidfile(); |
4526 | ||
0b2dc8df MD |
4527 | /* Create thread to manage the client socket */ |
4528 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4529 | thread_ht_cleanup, (void *) NULL); | |
4530 | if (ret != 0) { | |
4531 | PERROR("pthread_create ht_cleanup"); | |
4532 | goto exit_ht_cleanup; | |
4533 | } | |
4534 | ||
44a5e5eb DG |
4535 | /* Create thread to manage the client socket */ |
4536 | ret = pthread_create(&health_thread, NULL, | |
4537 | thread_manage_health, (void *) NULL); | |
4538 | if (ret != 0) { | |
4539 | PERROR("pthread_create health"); | |
4540 | goto exit_health; | |
4541 | } | |
4542 | ||
cf3af59e | 4543 | /* Create thread to manage the client socket */ |
099e26bd DG |
4544 | ret = pthread_create(&client_thread, NULL, |
4545 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4546 | if (ret != 0) { |
76d7553f | 4547 | PERROR("pthread_create clients"); |
cf3af59e MD |
4548 | goto exit_client; |
4549 | } | |
fac6795d | 4550 | |
099e26bd DG |
4551 | /* Create thread to dispatch registration */ |
4552 | ret = pthread_create(&dispatch_thread, NULL, | |
4553 | thread_dispatch_ust_registration, (void *) NULL); | |
4554 | if (ret != 0) { | |
76d7553f | 4555 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4556 | goto exit_dispatch; |
4557 | } | |
4558 | ||
4559 | /* Create thread to manage application registration. */ | |
4560 | ret = pthread_create(®_apps_thread, NULL, | |
4561 | thread_registration_apps, (void *) NULL); | |
4562 | if (ret != 0) { | |
76d7553f | 4563 | PERROR("pthread_create registration"); |
099e26bd DG |
4564 | goto exit_reg_apps; |
4565 | } | |
4566 | ||
cf3af59e | 4567 | /* Create thread to manage application socket */ |
54d01ffb DG |
4568 | ret = pthread_create(&apps_thread, NULL, |
4569 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4570 | if (ret != 0) { |
d0b96690 DG |
4571 | PERROR("pthread_create apps"); |
4572 | goto exit_apps; | |
4573 | } | |
4574 | ||
4575 | /* Create thread to manage application notify socket */ | |
4576 | ret = pthread_create(&apps_notify_thread, NULL, | |
4577 | ust_thread_manage_notify, (void *) NULL); | |
4578 | if (ret != 0) { | |
76d7553f | 4579 | PERROR("pthread_create apps"); |
cf3af59e MD |
4580 | goto exit_apps; |
4581 | } | |
fac6795d | 4582 | |
6620da75 DG |
4583 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4584 | if (is_root && !opt_no_kernel) { | |
4585 | /* Create kernel thread to manage kernel event */ | |
4586 | ret = pthread_create(&kernel_thread, NULL, | |
4587 | thread_manage_kernel, (void *) NULL); | |
4588 | if (ret != 0) { | |
4589 | PERROR("pthread_create kernel"); | |
4590 | goto exit_kernel; | |
4591 | } | |
7a485870 | 4592 | |
6620da75 DG |
4593 | ret = pthread_join(kernel_thread, &status); |
4594 | if (ret != 0) { | |
4595 | PERROR("pthread_join"); | |
4596 | goto error; /* join error, exit without cleanup */ | |
4597 | } | |
fac6795d DG |
4598 | } |
4599 | ||
cf3af59e MD |
4600 | exit_kernel: |
4601 | ret = pthread_join(apps_thread, &status); | |
4602 | if (ret != 0) { | |
76d7553f | 4603 | PERROR("pthread_join"); |
cf3af59e MD |
4604 | goto error; /* join error, exit without cleanup */ |
4605 | } | |
fac6795d | 4606 | |
cf3af59e | 4607 | exit_apps: |
099e26bd DG |
4608 | ret = pthread_join(reg_apps_thread, &status); |
4609 | if (ret != 0) { | |
76d7553f | 4610 | PERROR("pthread_join"); |
099e26bd DG |
4611 | goto error; /* join error, exit without cleanup */ |
4612 | } | |
4613 | ||
4614 | exit_reg_apps: | |
4615 | ret = pthread_join(dispatch_thread, &status); | |
4616 | if (ret != 0) { | |
76d7553f | 4617 | PERROR("pthread_join"); |
099e26bd DG |
4618 | goto error; /* join error, exit without cleanup */ |
4619 | } | |
4620 | ||
4621 | exit_dispatch: | |
cf3af59e MD |
4622 | ret = pthread_join(client_thread, &status); |
4623 | if (ret != 0) { | |
76d7553f | 4624 | PERROR("pthread_join"); |
cf3af59e MD |
4625 | goto error; /* join error, exit without cleanup */ |
4626 | } | |
4627 | ||
3bd1e081 | 4628 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4629 | if (ret != 0) { |
76d7553f | 4630 | PERROR("join_consumer"); |
cf3af59e MD |
4631 | goto error; /* join error, exit without cleanup */ |
4632 | } | |
a88df331 | 4633 | |
06f525de DG |
4634 | ret = join_consumer_thread(&ustconsumer32_data); |
4635 | if (ret != 0) { | |
4636 | PERROR("join_consumer ust32"); | |
4637 | goto error; /* join error, exit without cleanup */ | |
4638 | } | |
4639 | ||
4640 | ret = join_consumer_thread(&ustconsumer64_data); | |
4641 | if (ret != 0) { | |
4642 | PERROR("join_consumer ust64"); | |
4643 | goto error; /* join error, exit without cleanup */ | |
4644 | } | |
4645 | ||
cf3af59e | 4646 | exit_client: |
06f525de DG |
4647 | ret = pthread_join(health_thread, &status); |
4648 | if (ret != 0) { | |
4649 | PERROR("pthread_join health thread"); | |
4650 | goto error; /* join error, exit without cleanup */ | |
4651 | } | |
4652 | ||
44a5e5eb | 4653 | exit_health: |
0b2dc8df MD |
4654 | ret = pthread_join(ht_cleanup_thread, &status); |
4655 | if (ret != 0) { | |
4656 | PERROR("pthread_join ht cleanup thread"); | |
4657 | goto error; /* join error, exit without cleanup */ | |
4658 | } | |
4659 | exit_ht_cleanup: | |
a88df331 | 4660 | exit: |
cf3af59e MD |
4661 | /* |
4662 | * cleanup() is called when no other thread is running. | |
4663 | */ | |
f6a9efaa | 4664 | rcu_thread_online(); |
cf3af59e | 4665 | cleanup(); |
f6a9efaa DG |
4666 | rcu_thread_offline(); |
4667 | rcu_unregister_thread(); | |
67e40797 | 4668 | if (!ret) { |
cf3af59e | 4669 | exit(EXIT_SUCCESS); |
67e40797 | 4670 | } |
cf3af59e | 4671 | error: |
5e16da05 | 4672 | exit(EXIT_FAILURE); |
fac6795d | 4673 | } |