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