Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
bec39940 | 42 | #include <lttng-ht.h> |
e88129fc | 43 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 44 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 45 | |
1e307fab | 46 | #include <lttngerr.h> |
60b6c79c | 47 | #include <runas.h> |
fac6795d | 48 | |
54d01ffb | 49 | #include "channel.h" |
5eb91c98 | 50 | #include "compat/poll.h" |
b579acd9 | 51 | #include "context.h" |
54d01ffb | 52 | #include "event.h" |
099e26bd | 53 | #include "futex.h" |
4771f025 | 54 | #include "kernel.h" |
32258573 | 55 | #include "lttng-sessiond.h" |
0fdd1e2c | 56 | #include "shm.h" |
56fff090 | 57 | #include "ust-app.h" |
1e307fab | 58 | #include "ust-ctl.h" |
8e68d1c8 | 59 | #include "utils.h" |
fac6795d | 60 | |
ebaeda94 MD |
61 | #define CONSUMERD_FILE "lttng-consumerd" |
62 | ||
3bd1e081 MD |
63 | struct consumer_data { |
64 | enum lttng_consumer_type type; | |
65 | ||
66 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
67 | sem_t sem; | |
68 | ||
69 | /* Mutex to control consumerd pid assignation */ | |
70 | pthread_mutex_t pid_mutex; | |
71 | pid_t pid; | |
72 | ||
73 | int err_sock; | |
74 | int cmd_sock; | |
75 | ||
76 | /* consumer error and command Unix socket path */ | |
77 | char err_unix_sock_path[PATH_MAX]; | |
78 | char cmd_unix_sock_path[PATH_MAX]; | |
79 | }; | |
fac6795d | 80 | |
b25a8868 DG |
81 | #include "benchmark.h" |
82 | ||
75462a81 | 83 | /* Const values */ |
686204ab | 84 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 85 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
86 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
87 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
88 | ||
fac6795d | 89 | /* Variables */ |
1d4b027a | 90 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 91 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 92 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 93 | |
fac6795d DG |
94 | const char *progname; |
95 | const char *opt_tracing_group; | |
5b8719f5 | 96 | static int opt_sig_parent; |
fac6795d | 97 | static int opt_daemon; |
4fba7219 | 98 | static int opt_no_kernel; |
fac6795d | 99 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 100 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 101 | static char *rundir; |
3bd1e081 MD |
102 | |
103 | /* Consumer daemon specific control data */ | |
104 | static struct consumer_data kconsumer_data = { | |
105 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
106 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 108 | }; |
7753dea8 MD |
109 | static struct consumer_data ustconsumer64_data = { |
110 | .type = LTTNG_CONSUMER64_UST, | |
111 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
112 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
3bd1e081 | 113 | }; |
7753dea8 MD |
114 | static struct consumer_data ustconsumer32_data = { |
115 | .type = LTTNG_CONSUMER32_UST, | |
116 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
117 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
118 | }; |
119 | ||
099e26bd | 120 | static int dispatch_thread_exit; |
fac6795d | 121 | |
54d01ffb DG |
122 | /* Global application Unix socket path */ |
123 | static char apps_unix_sock_path[PATH_MAX]; | |
124 | /* Global client Unix socket path */ | |
125 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
126 | /* global wait shm path for UST */ |
127 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 128 | |
1d4b027a | 129 | /* Sockets and FDs */ |
d6f42150 DG |
130 | static int client_sock; |
131 | static int apps_sock; | |
20fe2104 | 132 | static int kernel_tracer_fd; |
7a485870 | 133 | static int kernel_poll_pipe[2]; |
1d4b027a | 134 | |
273ea72c DG |
135 | /* |
136 | * Quit pipe for all threads. This permits a single cancellation point | |
137 | * for all threads when receiving an event on the pipe. | |
138 | */ | |
139 | static int thread_quit_pipe[2]; | |
140 | ||
099e26bd DG |
141 | /* |
142 | * This pipe is used to inform the thread managing application communication | |
143 | * that a command is queued and ready to be processed. | |
144 | */ | |
145 | static int apps_cmd_pipe[2]; | |
146 | ||
1d4b027a | 147 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 148 | static pthread_t apps_thread; |
099e26bd | 149 | static pthread_t reg_apps_thread; |
1d4b027a | 150 | static pthread_t client_thread; |
7a485870 | 151 | static pthread_t kernel_thread; |
099e26bd | 152 | static pthread_t dispatch_thread; |
5eb91c98 | 153 | |
fac6795d | 154 | |
099e26bd DG |
155 | /* |
156 | * UST registration command queue. This queue is tied with a futex and uses a N | |
157 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
158 | * | |
159 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
160 | * this queue and the wait/wake scheme. | |
161 | */ | |
162 | static struct ust_cmd_queue ust_cmd_queue; | |
163 | ||
b5541356 DG |
164 | /* |
165 | * Pointer initialized before thread creation. | |
166 | * | |
167 | * This points to the tracing session list containing the session count and a | |
168 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
169 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 170 | * |
d063d709 | 171 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 172 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
173 | */ |
174 | static struct ltt_session_list *session_list_ptr; | |
175 | ||
7753dea8 MD |
176 | int ust_consumerd64_fd = -1; |
177 | int ust_consumerd32_fd = -1; | |
178 | ||
fc7a59ce AM |
179 | static const char *consumerd32_bin = |
180 | __stringify(CONFIG_CONSUMERD32_BIN); | |
181 | static const char *consumerd64_bin = | |
182 | __stringify(CONFIG_CONSUMERD64_BIN); | |
ebaeda94 MD |
183 | static const char *consumerd32_libdir = |
184 | __stringify(CONFIG_CONSUMERD32_LIBDIR); | |
185 | static const char *consumerd64_libdir = | |
186 | __stringify(CONFIG_CONSUMERD64_LIBDIR); | |
fb09408a MD |
187 | |
188 | static | |
7753dea8 | 189 | void setup_consumerd_path(void) |
fb09408a | 190 | { |
fc7a59ce | 191 | const char *bin, *libdir; |
fb09408a | 192 | |
7753dea8 MD |
193 | /* |
194 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
195 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
196 | * has not been defined. | |
7753dea8 | 197 | */ |
ebaeda94 | 198 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
199 | if (!consumerd32_bin[0]) { |
200 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
201 | } |
202 | if (!consumerd32_libdir[0]) { | |
203 | consumerd32_libdir = INSTALL_LIB_PATH; | |
204 | } | |
205 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
206 | if (!consumerd64_bin[0]) { |
207 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 208 | } |
ebaeda94 MD |
209 | if (!consumerd64_libdir[0]) { |
210 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
211 | } |
212 | #else | |
213 | #error "Unknown bitness" | |
214 | #endif | |
215 | ||
fb09408a MD |
216 | /* |
217 | * runtime env. var. overrides the build default. | |
218 | */ | |
fc7a59ce AM |
219 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
220 | if (bin) { | |
221 | consumerd32_bin = bin; | |
7753dea8 | 222 | } |
fc7a59ce AM |
223 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
224 | if (bin) { | |
225 | consumerd64_bin = bin; | |
ebaeda94 MD |
226 | } |
227 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
228 | if (libdir) { | |
229 | consumerd32_libdir = libdir; | |
230 | } | |
231 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
232 | if (libdir) { | |
233 | consumerd64_libdir = libdir; | |
fb09408a MD |
234 | } |
235 | } | |
236 | ||
5eb91c98 DG |
237 | /* |
238 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
239 | */ | |
240 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
241 | unsigned int size) | |
242 | { | |
243 | int ret; | |
244 | ||
245 | if (events == NULL || size == 0) { | |
246 | ret = -1; | |
247 | goto error; | |
248 | } | |
249 | ||
250 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
251 | if (ret < 0) { | |
252 | goto error; | |
253 | } | |
254 | ||
255 | /* Add quit pipe */ | |
256 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
257 | if (ret < 0) { | |
258 | goto error; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | ||
263 | error: | |
264 | return ret; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Check if the thread quit pipe was triggered. | |
269 | * | |
270 | * Return 1 if it was triggered else 0; | |
271 | */ | |
272 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
273 | { | |
274 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
275 | return 1; | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
0fdd1e2c DG |
281 | /* |
282 | * Remove modules in reverse load order. | |
283 | */ | |
284 | static int modprobe_remove_kernel_modules(void) | |
285 | { | |
286 | int ret = 0, i; | |
287 | char modprobe[256]; | |
288 | ||
289 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
290 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 291 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
292 | kernel_modules_list[i].name); |
293 | if (ret < 0) { | |
24b487b8 | 294 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
295 | goto error; |
296 | } | |
297 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
298 | ret = system(modprobe); | |
299 | if (ret == -1) { | |
24b487b8 | 300 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
301 | kernel_modules_list[i].name); |
302 | } else if (kernel_modules_list[i].required | |
303 | && WEXITSTATUS(ret) != 0) { | |
304 | ERR("Unable to remove module %s", | |
305 | kernel_modules_list[i].name); | |
306 | } else { | |
307 | DBG("Modprobe removal successful %s", | |
308 | kernel_modules_list[i].name); | |
309 | } | |
310 | } | |
311 | ||
312 | error: | |
313 | return ret; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Return group ID of the tracing group or -1 if not found. | |
318 | */ | |
996b65c8 MD |
319 | static gid_t allowed_group(void) |
320 | { | |
321 | struct group *grp; | |
322 | ||
274e143b MD |
323 | if (opt_tracing_group) { |
324 | grp = getgrnam(opt_tracing_group); | |
325 | } else { | |
326 | grp = getgrnam(default_tracing_group); | |
327 | } | |
996b65c8 MD |
328 | if (!grp) { |
329 | return -1; | |
330 | } else { | |
331 | return grp->gr_gid; | |
332 | } | |
333 | } | |
334 | ||
273ea72c | 335 | /* |
5eb91c98 | 336 | * Init thread quit pipe. |
273ea72c DG |
337 | * |
338 | * Return -1 on error or 0 if all pipes are created. | |
339 | */ | |
340 | static int init_thread_quit_pipe(void) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
345 | if (ret < 0) { | |
346 | perror("thread quit pipe"); | |
347 | goto error; | |
348 | } | |
349 | ||
350 | error: | |
351 | return ret; | |
352 | } | |
353 | ||
fac6795d | 354 | /* |
d063d709 DG |
355 | * Complete teardown of a kernel session. This free all data structure related |
356 | * to a kernel session and update counter. | |
fac6795d | 357 | */ |
1d4b027a | 358 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 359 | { |
8f7a84dd DG |
360 | if (!session->kernel_session) { |
361 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 362 | return; |
8f7a84dd | 363 | } |
d9800920 | 364 | |
84ea9c99 | 365 | DBG("Tearing down kernel session"); |
d9800920 | 366 | |
84ea9c99 MD |
367 | /* |
368 | * If a custom kernel consumer was registered, close the socket before | |
369 | * tearing down the complete kernel session structure | |
370 | */ | |
371 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
372 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 373 | } |
84ea9c99 MD |
374 | |
375 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
376 | } |
377 | ||
f6a9efaa DG |
378 | /* |
379 | * Complete teardown of all UST sessions. This will free everything on his path | |
380 | * and destroy the core essence of all ust sessions :) | |
381 | */ | |
382 | static void teardown_ust_session(struct ltt_session *session) | |
383 | { | |
84cd17c6 MD |
384 | int ret; |
385 | ||
8f7a84dd DG |
386 | if (!session->ust_session) { |
387 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 388 | return; |
8f7a84dd DG |
389 | } |
390 | ||
f6a9efaa DG |
391 | DBG("Tearing down UST session(s)"); |
392 | ||
84cd17c6 MD |
393 | ret = ust_app_destroy_trace_all(session->ust_session); |
394 | if (ret) { | |
395 | ERR("Error in ust_app_destroy_trace_all"); | |
396 | } | |
8f7a84dd | 397 | |
f6a9efaa DG |
398 | trace_ust_destroy_session(session->ust_session); |
399 | } | |
400 | ||
099e26bd DG |
401 | /* |
402 | * Stop all threads by closing the thread quit pipe. | |
403 | */ | |
cf3af59e MD |
404 | static void stop_threads(void) |
405 | { | |
5eb91c98 DG |
406 | int ret; |
407 | ||
cf3af59e MD |
408 | /* Stopping all threads */ |
409 | DBG("Terminating all threads"); | |
54d01ffb | 410 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
411 | if (ret < 0) { |
412 | ERR("write error on thread quit pipe"); | |
413 | } | |
414 | ||
099e26bd DG |
415 | /* Dispatch thread */ |
416 | dispatch_thread_exit = 1; | |
417 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
418 | } |
419 | ||
fac6795d | 420 | /* |
d063d709 | 421 | * Cleanup the daemon |
fac6795d | 422 | */ |
cf3af59e | 423 | static void cleanup(void) |
fac6795d | 424 | { |
1d4b027a DG |
425 | int ret; |
426 | char *cmd; | |
af9737e9 | 427 | struct ltt_session *sess, *stmp; |
fac6795d | 428 | |
1d4b027a | 429 | DBG("Cleaning up"); |
e07ae692 | 430 | |
67e40797 DG |
431 | DBG("Removing %s directory", rundir); |
432 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
433 | if (ret < 0) { | |
434 | ERR("asprintf failed. Something is really wrong!"); | |
435 | } | |
5461b305 | 436 | |
67e40797 DG |
437 | /* Remove lttng run directory */ |
438 | ret = system(cmd); | |
439 | if (ret < 0) { | |
440 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 441 | } |
67e40797 | 442 | free(cmd); |
5461b305 | 443 | |
1d4b027a | 444 | DBG("Cleaning up all session"); |
fac6795d | 445 | |
b5541356 | 446 | /* Destroy session list mutex */ |
273ea72c DG |
447 | if (session_list_ptr != NULL) { |
448 | pthread_mutex_destroy(&session_list_ptr->lock); | |
449 | ||
450 | /* Cleanup ALL session */ | |
54d01ffb DG |
451 | cds_list_for_each_entry_safe(sess, stmp, |
452 | &session_list_ptr->head, list) { | |
273ea72c | 453 | teardown_kernel_session(sess); |
f6a9efaa DG |
454 | teardown_ust_session(sess); |
455 | free(sess); | |
273ea72c DG |
456 | } |
457 | } | |
458 | ||
099e26bd | 459 | DBG("Closing all UST sockets"); |
56fff090 | 460 | ust_app_clean_list(); |
099e26bd | 461 | |
3bd1e081 | 462 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 463 | |
4fba7219 DG |
464 | if (is_root && !opt_no_kernel) { |
465 | DBG2("Closing kernel fd"); | |
466 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
467 | DBG("Unloading kernel modules"); |
468 | modprobe_remove_kernel_modules(); | |
469 | } | |
b25a8868 | 470 | |
5eb91c98 DG |
471 | close(thread_quit_pipe[0]); |
472 | close(thread_quit_pipe[1]); | |
dab4c8a1 | 473 | |
3c6bae61 DG |
474 | /* OUTPUT BENCHMARK RESULTS */ |
475 | bench_init(); | |
476 | ||
62d53818 DG |
477 | if (getenv("BENCH_UST_NOTIFY")) { |
478 | bench_print_ust_notification(); | |
479 | } | |
480 | ||
481 | if (getenv("BENCH_UST_REGISTER")) { | |
482 | bench_print_ust_register(); | |
ccca3fea | 483 | bench_print_ust_unregister(); |
62d53818 DG |
484 | } |
485 | ||
486 | if (getenv("BENCH_BOOT_PROCESS")) { | |
487 | bench_print_boot_process(); | |
488 | } | |
3c6bae61 DG |
489 | |
490 | bench_close(); | |
491 | /* END BENCHMARK */ | |
bb3037a9 | 492 | |
421cb601 | 493 | /* <fun> */ |
f56a39af | 494 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
495 | "Matthew, BEET driven development works!%c[%dm", |
496 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
497 | /* </fun> */ | |
fac6795d DG |
498 | } |
499 | ||
e065084a | 500 | /* |
d063d709 | 501 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 502 | * |
d063d709 | 503 | * Return lttcomm error code. |
e065084a DG |
504 | */ |
505 | static int send_unix_sock(int sock, void *buf, size_t len) | |
506 | { | |
507 | /* Check valid length */ | |
508 | if (len <= 0) { | |
509 | return -1; | |
510 | } | |
511 | ||
512 | return lttcomm_send_unix_sock(sock, buf, len); | |
513 | } | |
514 | ||
5461b305 | 515 | /* |
d063d709 | 516 | * Free memory of a command context structure. |
5461b305 | 517 | */ |
a2fb29a5 | 518 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 519 | { |
a2fb29a5 DG |
520 | DBG("Clean command context structure"); |
521 | if (*cmd_ctx) { | |
522 | if ((*cmd_ctx)->llm) { | |
523 | free((*cmd_ctx)->llm); | |
5461b305 | 524 | } |
a2fb29a5 DG |
525 | if ((*cmd_ctx)->lsm) { |
526 | free((*cmd_ctx)->lsm); | |
5461b305 | 527 | } |
a2fb29a5 DG |
528 | free(*cmd_ctx); |
529 | *cmd_ctx = NULL; | |
5461b305 DG |
530 | } |
531 | } | |
532 | ||
f3ed775e | 533 | /* |
d063d709 | 534 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 535 | */ |
2bdd86d4 | 536 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
537 | int sock, struct ltt_kernel_channel *channel, |
538 | uid_t uid, gid_t gid) | |
f3ed775e DG |
539 | { |
540 | int ret; | |
f3ed775e | 541 | struct ltt_kernel_stream *stream; |
3bd1e081 | 542 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 543 | |
3bd1e081 | 544 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 545 | channel->channel->name); |
7a485870 | 546 | |
3bd1e081 MD |
547 | /* Send channel */ |
548 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
549 | lkm.u.channel.channel_key = channel->fd; | |
550 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
551 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 552 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 553 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 554 | if (ret < 0) { |
3bd1e081 | 555 | perror("send consumer channel"); |
f3ed775e DG |
556 | goto error; |
557 | } | |
558 | ||
3bd1e081 | 559 | /* Send streams */ |
7a485870 | 560 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
561 | if (!stream->fd) { |
562 | continue; | |
563 | } | |
564 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
565 | lkm.u.stream.channel_key = channel->fd; | |
566 | lkm.u.stream.stream_key = stream->fd; | |
567 | lkm.u.stream.state = stream->state; | |
568 | lkm.u.stream.output = channel->channel->attr.output; | |
569 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
570 | lkm.u.stream.uid = uid; |
571 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
572 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
573 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
574 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
575 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
576 | if (ret < 0) { | |
577 | perror("send consumer stream"); | |
578 | goto error; | |
579 | } | |
580 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
581 | if (ret < 0) { | |
582 | perror("send consumer stream ancillary data"); | |
583 | goto error; | |
f3ed775e DG |
584 | } |
585 | } | |
586 | ||
3bd1e081 | 587 | DBG("consumer channel streams sent"); |
f3ed775e DG |
588 | |
589 | return 0; | |
590 | ||
591 | error: | |
592 | return ret; | |
593 | } | |
594 | ||
595 | /* | |
d063d709 | 596 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 597 | */ |
2bdd86d4 | 598 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 599 | struct ltt_kernel_session *session) |
f3ed775e DG |
600 | { |
601 | int ret; | |
602 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
603 | struct lttcomm_consumer_msg lkm; |
604 | int sock = session->consumer_fd; | |
7a485870 DG |
605 | |
606 | DBG("Sending metadata stream fd"); | |
607 | ||
2bdd86d4 | 608 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 609 | if (session->consumer_fd == 0) { |
3bd1e081 | 610 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
611 | } |
612 | ||
7a485870 | 613 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
614 | /* Send metadata channel fd */ |
615 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
616 | lkm.u.channel.channel_key = session->metadata->fd; | |
617 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
618 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
619 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
620 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
621 | if (ret < 0) { | |
622 | perror("send consumer channel"); | |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* Send metadata stream fd */ | |
627 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
628 | lkm.u.stream.channel_key = session->metadata->fd; | |
629 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
630 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
631 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
632 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
633 | lkm.u.stream.uid = session->uid; |
634 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
635 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
636 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
637 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
638 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
7a485870 | 639 | if (ret < 0) { |
3bd1e081 MD |
640 | perror("send consumer stream"); |
641 | goto error; | |
642 | } | |
643 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 644 | if (ret < 0) { |
3bd1e081 | 645 | perror("send consumer stream"); |
7a485870 DG |
646 | goto error; |
647 | } | |
648 | } | |
f3ed775e | 649 | |
f3ed775e | 650 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
651 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
652 | session->uid, session->gid); | |
f3ed775e | 653 | if (ret < 0) { |
7a485870 | 654 | goto error; |
f3ed775e DG |
655 | } |
656 | } | |
657 | ||
2bdd86d4 | 658 | DBG("consumer fds (metadata and channel streams) sent"); |
7a485870 | 659 | |
f3ed775e DG |
660 | return 0; |
661 | ||
662 | error: | |
663 | return ret; | |
664 | } | |
665 | ||
fac6795d | 666 | /* |
0fdd1e2c | 667 | * Notify UST applications using the shm mmap futex. |
fac6795d | 668 | */ |
0fdd1e2c | 669 | static int notify_ust_apps(int active) |
fac6795d | 670 | { |
0fdd1e2c | 671 | char *wait_shm_mmap; |
fac6795d | 672 | |
0fdd1e2c | 673 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 674 | |
62d53818 DG |
675 | tracepoint(ust_notify_apps_start); |
676 | ||
0fdd1e2c DG |
677 | /* See shm.c for this call implying mmap, shm and futex calls */ |
678 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
679 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
680 | goto error; |
681 | } | |
682 | ||
0fdd1e2c DG |
683 | /* Wake waiting process */ |
684 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
685 | ||
62d53818 DG |
686 | tracepoint(ust_notify_apps_stop); |
687 | ||
0fdd1e2c DG |
688 | /* Apps notified successfully */ |
689 | return 0; | |
fac6795d DG |
690 | |
691 | error: | |
0fdd1e2c | 692 | return -1; |
fac6795d DG |
693 | } |
694 | ||
e065084a | 695 | /* |
d063d709 DG |
696 | * Setup the outgoing data buffer for the response (llm) by allocating the |
697 | * right amount of memory and copying the original information from the lsm | |
698 | * structure. | |
ca95a216 | 699 | * |
d063d709 | 700 | * Return total size of the buffer pointed by buf. |
ca95a216 | 701 | */ |
5461b305 | 702 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 703 | { |
f3ed775e | 704 | int ret, buf_size; |
ca95a216 | 705 | |
f3ed775e | 706 | buf_size = size; |
5461b305 | 707 | |
ba7f0ae5 | 708 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 709 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 710 | perror("zmalloc"); |
5461b305 | 711 | ret = -ENOMEM; |
ca95a216 DG |
712 | goto error; |
713 | } | |
714 | ||
5461b305 DG |
715 | /* Copy common data */ |
716 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 717 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 718 | |
5461b305 DG |
719 | cmd_ctx->llm->data_size = size; |
720 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
721 | ||
ca95a216 DG |
722 | return buf_size; |
723 | ||
724 | error: | |
725 | return ret; | |
726 | } | |
727 | ||
7a485870 | 728 | /* |
5eb91c98 | 729 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 730 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 731 | */ |
5eb91c98 | 732 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 733 | { |
5eb91c98 | 734 | int ret; |
7a485870 DG |
735 | struct ltt_session *session; |
736 | struct ltt_kernel_channel *channel; | |
737 | ||
5eb91c98 | 738 | DBG("Updating kernel poll set"); |
7a485870 | 739 | |
54d01ffb | 740 | session_lock_list(); |
b5541356 | 741 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 742 | session_lock(session); |
7a485870 | 743 | if (session->kernel_session == NULL) { |
54d01ffb | 744 | session_unlock(session); |
7a485870 DG |
745 | continue; |
746 | } | |
7a485870 | 747 | |
54d01ffb DG |
748 | cds_list_for_each_entry(channel, |
749 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
750 | /* Add channel fd to the kernel poll set */ |
751 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
752 | if (ret < 0) { | |
54d01ffb | 753 | session_unlock(session); |
5eb91c98 DG |
754 | goto error; |
755 | } | |
756 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 757 | } |
54d01ffb | 758 | session_unlock(session); |
7a485870 | 759 | } |
54d01ffb | 760 | session_unlock_list(); |
7a485870 | 761 | |
5eb91c98 | 762 | return 0; |
7a485870 DG |
763 | |
764 | error: | |
54d01ffb | 765 | session_unlock_list(); |
7a485870 DG |
766 | return -1; |
767 | } | |
768 | ||
769 | /* | |
54d01ffb | 770 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 771 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 772 | * |
d063d709 | 773 | * Useful for CPU hotplug feature. |
7a485870 | 774 | */ |
2bdd86d4 | 775 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
776 | { |
777 | int ret = 0; | |
778 | struct ltt_session *session; | |
779 | struct ltt_kernel_channel *channel; | |
780 | ||
781 | DBG("Updating kernel streams for channel fd %d", fd); | |
782 | ||
54d01ffb | 783 | session_lock_list(); |
b5541356 | 784 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 785 | session_lock(session); |
7a485870 | 786 | if (session->kernel_session == NULL) { |
54d01ffb | 787 | session_unlock(session); |
7a485870 DG |
788 | continue; |
789 | } | |
d9800920 DG |
790 | |
791 | /* This is not suppose to be 0 but this is an extra security check */ | |
792 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 793 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
794 | } |
795 | ||
5eb91c98 DG |
796 | cds_list_for_each_entry(channel, |
797 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
798 | if (channel->fd == fd) { |
799 | DBG("Channel found, updating kernel streams"); | |
800 | ret = kernel_open_channel_stream(channel); | |
801 | if (ret < 0) { | |
b3c750d2 | 802 | goto error; |
7a485870 | 803 | } |
d9800920 | 804 | |
7a485870 | 805 | /* |
5eb91c98 DG |
806 | * Have we already sent fds to the consumer? If yes, it means |
807 | * that tracing is started so it is safe to send our updated | |
808 | * stream fds. | |
7a485870 | 809 | */ |
3bd1e081 | 810 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 811 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
812 | session->kernel_session->consumer_fd, channel, |
813 | session->uid, session->gid); | |
7a485870 | 814 | if (ret < 0) { |
b3c750d2 | 815 | goto error; |
7a485870 DG |
816 | } |
817 | } | |
b3c750d2 | 818 | goto error; |
7a485870 DG |
819 | } |
820 | } | |
54d01ffb | 821 | session_unlock(session); |
7a485870 | 822 | } |
54d01ffb | 823 | session_unlock_list(); |
b3c750d2 | 824 | return ret; |
7a485870 | 825 | |
b3c750d2 | 826 | error: |
54d01ffb DG |
827 | session_unlock(session); |
828 | session_unlock_list(); | |
7a485870 DG |
829 | return ret; |
830 | } | |
831 | ||
487cf67c DG |
832 | /* |
833 | * For each tracing session, update newly registered apps. | |
834 | */ | |
835 | static void update_ust_app(int app_sock) | |
836 | { | |
837 | struct ltt_session *sess, *stmp; | |
838 | ||
839 | /* For all tracing session(s) */ | |
840 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
841 | if (sess->ust_session) { |
842 | ust_app_global_update(sess->ust_session, app_sock); | |
843 | } | |
487cf67c DG |
844 | } |
845 | } | |
846 | ||
7a485870 | 847 | /* |
d063d709 | 848 | * This thread manage event coming from the kernel. |
7a485870 | 849 | * |
d063d709 DG |
850 | * Features supported in this thread: |
851 | * -) CPU Hotplug | |
7a485870 DG |
852 | */ |
853 | static void *thread_manage_kernel(void *data) | |
854 | { | |
5eb91c98 DG |
855 | int ret, i, pollfd, update_poll_flag = 1; |
856 | uint32_t revents, nb_fd; | |
7a485870 | 857 | char tmp; |
5eb91c98 | 858 | struct lttng_poll_event events; |
7a485870 | 859 | |
b25a8868 DG |
860 | tracepoint(sessiond_th_kern_start); |
861 | ||
7a485870 DG |
862 | DBG("Thread manage kernel started"); |
863 | ||
5eb91c98 DG |
864 | ret = create_thread_poll_set(&events, 2); |
865 | if (ret < 0) { | |
866 | goto error; | |
867 | } | |
868 | ||
869 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
870 | if (ret < 0) { | |
871 | goto error; | |
872 | } | |
873 | ||
7a485870 DG |
874 | while (1) { |
875 | if (update_poll_flag == 1) { | |
5f822d0a DG |
876 | /* |
877 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
878 | * quit pipe and the kernel pipe. | |
879 | */ | |
880 | events.nb_fd = 2; | |
881 | ||
5eb91c98 DG |
882 | ret = update_kernel_poll(&events); |
883 | if (ret < 0) { | |
7a485870 DG |
884 | goto error; |
885 | } | |
886 | update_poll_flag = 0; | |
887 | } | |
888 | ||
5eb91c98 DG |
889 | nb_fd = LTTNG_POLL_GETNB(&events); |
890 | ||
891 | DBG("Thread kernel polling on %d fds", nb_fd); | |
892 | ||
893 | /* Zeroed the poll events */ | |
894 | lttng_poll_reset(&events); | |
7a485870 | 895 | |
b25a8868 DG |
896 | tracepoint(sessiond_th_kern_poll); |
897 | ||
7a485870 | 898 | /* Poll infinite value of time */ |
5eb91c98 | 899 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 900 | if (ret < 0) { |
7a485870 DG |
901 | goto error; |
902 | } else if (ret == 0) { | |
903 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
904 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
905 | "This should not have happened! Continuing..."); | |
7a485870 DG |
906 | continue; |
907 | } | |
908 | ||
5eb91c98 DG |
909 | for (i = 0; i < nb_fd; i++) { |
910 | /* Fetch once the poll data */ | |
911 | revents = LTTNG_POLL_GETEV(&events, i); | |
912 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 913 | |
5eb91c98 DG |
914 | /* Thread quit pipe has been closed. Killing thread. */ |
915 | ret = check_thread_quit_pipe(pollfd, revents); | |
916 | if (ret) { | |
917 | goto error; | |
918 | } | |
7a485870 | 919 | |
5eb91c98 DG |
920 | /* Check for data on kernel pipe */ |
921 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
922 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
923 | update_poll_flag = 1; | |
924 | continue; | |
925 | } else { | |
926 | /* | |
927 | * New CPU detected by the kernel. Adding kernel stream to | |
928 | * kernel session and updating the kernel consumer | |
929 | */ | |
930 | if (revents & LPOLLIN) { | |
2bdd86d4 | 931 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
932 | if (ret < 0) { |
933 | continue; | |
934 | } | |
935 | break; | |
936 | /* | |
937 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
938 | * and unregister kernel stream at this point. | |
939 | */ | |
7a485870 | 940 | } |
7a485870 DG |
941 | } |
942 | } | |
943 | } | |
944 | ||
945 | error: | |
946 | DBG("Kernel thread dying"); | |
273ea72c DG |
947 | close(kernel_poll_pipe[0]); |
948 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
949 | |
950 | lttng_poll_clean(&events); | |
951 | ||
7a485870 DG |
952 | return NULL; |
953 | } | |
954 | ||
1d4b027a | 955 | /* |
3bd1e081 | 956 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 957 | */ |
3bd1e081 | 958 | static void *thread_manage_consumer(void *data) |
1d4b027a | 959 | { |
5eb91c98 DG |
960 | int sock = 0, i, ret, pollfd; |
961 | uint32_t revents, nb_fd; | |
1d4b027a | 962 | enum lttcomm_return_code code; |
5eb91c98 | 963 | struct lttng_poll_event events; |
3bd1e081 | 964 | struct consumer_data *consumer_data = data; |
1d4b027a | 965 | |
b25a8868 DG |
966 | tracepoint(sessiond_th_kcon_start); |
967 | ||
3bd1e081 | 968 | DBG("[thread] Manage consumer started"); |
1d4b027a | 969 | |
3bd1e081 | 970 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
971 | if (ret < 0) { |
972 | goto error; | |
973 | } | |
974 | ||
5eb91c98 DG |
975 | /* |
976 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
977 | * Nothing more will be added to this poll set. | |
978 | */ | |
979 | ret = create_thread_poll_set(&events, 2); | |
980 | if (ret < 0) { | |
981 | goto error; | |
982 | } | |
273ea72c | 983 | |
3bd1e081 | 984 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
985 | if (ret < 0) { |
986 | goto error; | |
987 | } | |
273ea72c | 988 | |
5eb91c98 | 989 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 990 | |
b25a8868 DG |
991 | tracepoint(sessiond_th_kcon_poll); |
992 | ||
273ea72c | 993 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 994 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 995 | if (ret < 0) { |
273ea72c DG |
996 | goto error; |
997 | } | |
998 | ||
5eb91c98 DG |
999 | for (i = 0; i < nb_fd; i++) { |
1000 | /* Fetch once the poll data */ | |
1001 | revents = LTTNG_POLL_GETEV(&events, i); | |
1002 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1003 | ||
1004 | /* Thread quit pipe has been closed. Killing thread. */ | |
1005 | ret = check_thread_quit_pipe(pollfd, revents); | |
1006 | if (ret) { | |
1007 | goto error; | |
1008 | } | |
1009 | ||
1010 | /* Event on the registration socket */ | |
3bd1e081 | 1011 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1012 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1013 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1014 | goto error; |
1015 | } | |
1016 | } | |
273ea72c DG |
1017 | } |
1018 | ||
3bd1e081 | 1019 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1020 | if (sock < 0) { |
1021 | goto error; | |
1022 | } | |
1023 | ||
3bd1e081 | 1024 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1025 | |
712ea556 | 1026 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1027 | ret = lttcomm_recv_unix_sock(sock, &code, |
1028 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1029 | if (ret <= 0) { |
1030 | goto error; | |
1031 | } | |
1032 | ||
3bd1e081 MD |
1033 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1034 | consumer_data->cmd_sock = | |
1035 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1036 | if (consumer_data->cmd_sock < 0) { | |
1037 | sem_post(&consumer_data->sem); | |
48842b30 | 1038 | PERROR("consumer connect"); |
1d4b027a DG |
1039 | goto error; |
1040 | } | |
1041 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1042 | sem_post(&consumer_data->sem); |
1043 | DBG("consumer command socket ready"); | |
1d4b027a | 1044 | } else { |
3bd1e081 | 1045 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1046 | lttcomm_get_readable_code(-code)); |
1047 | goto error; | |
1048 | } | |
1049 | ||
54d01ffb | 1050 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1051 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1052 | if (ret < 0) { |
72079cae DG |
1053 | goto error; |
1054 | } | |
1055 | ||
5eb91c98 DG |
1056 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1057 | if (ret < 0) { | |
72079cae | 1058 | goto error; |
5eb91c98 DG |
1059 | } |
1060 | ||
1061 | /* Update number of fd */ | |
1062 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1063 | ||
1064 | /* Inifinite blocking call, waiting for transmission */ | |
1065 | ret = lttng_poll_wait(&events, -1); | |
1066 | if (ret < 0) { | |
72079cae DG |
1067 | goto error; |
1068 | } | |
1069 | ||
5eb91c98 DG |
1070 | for (i = 0; i < nb_fd; i++) { |
1071 | /* Fetch once the poll data */ | |
1072 | revents = LTTNG_POLL_GETEV(&events, i); | |
1073 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1074 | ||
1075 | /* Thread quit pipe has been closed. Killing thread. */ | |
1076 | ret = check_thread_quit_pipe(pollfd, revents); | |
1077 | if (ret) { | |
1078 | goto error; | |
1079 | } | |
1080 | ||
1081 | /* Event on the kconsumerd socket */ | |
1082 | if (pollfd == sock) { | |
1083 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1084 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1085 | goto error; |
1086 | } | |
1087 | } | |
1088 | } | |
1089 | ||
712ea556 | 1090 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1091 | ret = lttcomm_recv_unix_sock(sock, &code, |
1092 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1093 | if (ret <= 0) { |
3bd1e081 | 1094 | ERR("consumer closed the command socket"); |
712ea556 | 1095 | goto error; |
6f61d021 | 1096 | } |
1d4b027a | 1097 | |
3bd1e081 | 1098 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1099 | |
1d4b027a | 1100 | error: |
3bd1e081 MD |
1101 | DBG("consumer thread dying"); |
1102 | close(consumer_data->err_sock); | |
1103 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1104 | close(sock); |
273ea72c | 1105 | |
3bd1e081 MD |
1106 | unlink(consumer_data->err_unix_sock_path); |
1107 | unlink(consumer_data->cmd_unix_sock_path); | |
1108 | consumer_data->pid = 0; | |
0177d773 | 1109 | |
5eb91c98 | 1110 | lttng_poll_clean(&events); |
0177d773 | 1111 | |
5eb91c98 | 1112 | return NULL; |
099e26bd DG |
1113 | } |
1114 | ||
099e26bd DG |
1115 | /* |
1116 | * This thread manage application communication. | |
1d4b027a DG |
1117 | */ |
1118 | static void *thread_manage_apps(void *data) | |
099e26bd | 1119 | { |
5eb91c98 DG |
1120 | int i, ret, pollfd; |
1121 | uint32_t revents, nb_fd; | |
099e26bd | 1122 | struct ust_command ust_cmd; |
5eb91c98 | 1123 | struct lttng_poll_event events; |
099e26bd | 1124 | |
85c434ee DG |
1125 | tracepoint(sessiond_th_apps_start); |
1126 | ||
099e26bd DG |
1127 | DBG("[thread] Manage application started"); |
1128 | ||
f6a9efaa DG |
1129 | rcu_register_thread(); |
1130 | rcu_thread_online(); | |
1131 | ||
5eb91c98 DG |
1132 | ret = create_thread_poll_set(&events, 2); |
1133 | if (ret < 0) { | |
1134 | goto error; | |
1135 | } | |
099e26bd | 1136 | |
5eb91c98 DG |
1137 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1138 | if (ret < 0) { | |
1139 | goto error; | |
1140 | } | |
099e26bd | 1141 | |
5eb91c98 DG |
1142 | while (1) { |
1143 | /* Zeroed the events structure */ | |
1144 | lttng_poll_reset(&events); | |
0177d773 | 1145 | |
5eb91c98 | 1146 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1147 | |
1148 | DBG("Apps thread polling on %d fds", nb_fd); | |
1149 | ||
85c434ee DG |
1150 | tracepoint(sessiond_th_apps_poll); |
1151 | ||
099e26bd | 1152 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1153 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1154 | if (ret < 0) { |
099e26bd DG |
1155 | goto error; |
1156 | } | |
1157 | ||
5eb91c98 DG |
1158 | for (i = 0; i < nb_fd; i++) { |
1159 | /* Fetch once the poll data */ | |
1160 | revents = LTTNG_POLL_GETEV(&events, i); | |
1161 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1162 | ||
1163 | /* Thread quit pipe has been closed. Killing thread. */ | |
1164 | ret = check_thread_quit_pipe(pollfd, revents); | |
1165 | if (ret) { | |
099e26bd | 1166 | goto error; |
5eb91c98 | 1167 | } |
62d53818 | 1168 | |
5eb91c98 DG |
1169 | /* Inspect the apps cmd pipe */ |
1170 | if (pollfd == apps_cmd_pipe[0]) { | |
1171 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1172 | ERR("Apps command pipe error"); | |
0177d773 | 1173 | goto error; |
5eb91c98 | 1174 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1175 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1176 | /* Empty pipe */ |
1177 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1178 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1179 | perror("read apps cmd pipe"); | |
1180 | goto error; | |
1181 | } | |
a89c7d1b | 1182 | tracepoint(ust_register_read_stop); |
099e26bd | 1183 | |
a89c7d1b | 1184 | tracepoint(ust_register_add_start); |
5eb91c98 | 1185 | /* Register applicaton to the session daemon */ |
56fff090 | 1186 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1187 | ust_cmd.sock); |
88ff5b7f | 1188 | if (ret == -ENOMEM) { |
5eb91c98 | 1189 | goto error; |
88ff5b7f MD |
1190 | } else if (ret < 0) { |
1191 | break; | |
5eb91c98 | 1192 | } |
a89c7d1b | 1193 | tracepoint(ust_register_add_stop); |
85c434ee | 1194 | |
a89c7d1b | 1195 | tracepoint(ust_register_done_start); |
acc7b41b MD |
1196 | /* |
1197 | * Add channel(s) and event(s) to newly registered apps | |
1198 | * from lttng global UST domain. | |
1199 | */ | |
1200 | update_ust_app(ust_cmd.sock); | |
1201 | ||
f2ca2e25 | 1202 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1203 | if (ret < 0) { |
1204 | /* | |
1205 | * If the registration is not possible, we simply | |
1206 | * unregister the apps and continue | |
1207 | */ | |
56fff090 | 1208 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1209 | } else { |
1210 | /* | |
1211 | * We just need here to monitor the close of the UST | |
1212 | * socket and poll set monitor those by default. | |
1213 | */ | |
1214 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1215 | if (ret < 0) { | |
1216 | goto error; | |
1217 | } | |
1218 | ||
54d01ffb DG |
1219 | DBG("Apps with sock %d added to poll set", |
1220 | ust_cmd.sock); | |
5eb91c98 | 1221 | } |
a89c7d1b | 1222 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1223 | break; |
0177d773 | 1224 | } |
5eb91c98 DG |
1225 | } else { |
1226 | /* | |
54d01ffb DG |
1227 | * At this point, we know that a registered application made |
1228 | * the event at poll_wait. | |
5eb91c98 DG |
1229 | */ |
1230 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
aa231298 DG |
1231 | tracepoint(ust_unregister_start); |
1232 | ||
5eb91c98 DG |
1233 | /* Removing from the poll set */ |
1234 | ret = lttng_poll_del(&events, pollfd); | |
1235 | if (ret < 0) { | |
1236 | goto error; | |
1237 | } | |
099e26bd | 1238 | |
b9d9b220 | 1239 | /* Socket closed on remote end. */ |
56fff090 | 1240 | ust_app_unregister(pollfd); |
aa231298 DG |
1241 | |
1242 | tracepoint(ust_unregister_stop); | |
5eb91c98 | 1243 | break; |
0177d773 | 1244 | } |
099e26bd DG |
1245 | } |
1246 | } | |
099e26bd DG |
1247 | } |
1248 | ||
1249 | error: | |
1250 | DBG("Application communication apps dying"); | |
1251 | close(apps_cmd_pipe[0]); | |
1252 | close(apps_cmd_pipe[1]); | |
1253 | ||
5eb91c98 | 1254 | lttng_poll_clean(&events); |
099e26bd | 1255 | |
f6a9efaa DG |
1256 | rcu_thread_offline(); |
1257 | rcu_unregister_thread(); | |
099e26bd DG |
1258 | return NULL; |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Dispatch request from the registration threads to the application | |
1263 | * communication thread. | |
1264 | */ | |
1265 | static void *thread_dispatch_ust_registration(void *data) | |
1266 | { | |
1267 | int ret; | |
1268 | struct cds_wfq_node *node; | |
1269 | struct ust_command *ust_cmd = NULL; | |
1270 | ||
85c434ee DG |
1271 | tracepoint(sessiond_th_dispatch_start); |
1272 | ||
099e26bd DG |
1273 | DBG("[thread] Dispatch UST command started"); |
1274 | ||
1275 | while (!dispatch_thread_exit) { | |
1276 | /* Atomically prepare the queue futex */ | |
1277 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1278 | ||
1279 | do { | |
85c434ee DG |
1280 | tracepoint(sessiond_th_dispatch_block); |
1281 | ||
099e26bd DG |
1282 | /* Dequeue command for registration */ |
1283 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1284 | if (node == NULL) { | |
00a17c97 | 1285 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1286 | /* Continue thread execution */ |
1287 | break; | |
1288 | } | |
1289 | ||
62d53818 DG |
1290 | tracepoint(ust_dispatch_register_start); |
1291 | ||
099e26bd DG |
1292 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1293 | ||
2f50c8a3 DG |
1294 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1295 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1296 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1297 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1298 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1299 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1300 | /* |
1301 | * Inform apps thread of the new application registration. This | |
1302 | * call is blocking so we can be assured that the data will be read | |
1303 | * at some point in time or wait to the end of the world :) | |
1304 | */ | |
1305 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1306 | sizeof(struct ust_command)); | |
1307 | if (ret < 0) { | |
1308 | perror("write apps cmd pipe"); | |
1309 | if (errno == EBADF) { | |
1310 | /* | |
1311 | * We can't inform the application thread to process | |
1312 | * registration. We will exit or else application | |
1313 | * registration will not occur and tracing will never | |
1314 | * start. | |
1315 | */ | |
1316 | goto error; | |
1317 | } | |
1318 | } | |
1319 | free(ust_cmd); | |
1320 | } while (node != NULL); | |
1321 | ||
62d53818 DG |
1322 | tracepoint(ust_dispatch_register_stop); |
1323 | ||
099e26bd DG |
1324 | /* Futex wait on queue. Blocking call on futex() */ |
1325 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1326 | } | |
1327 | ||
1328 | error: | |
1329 | DBG("Dispatch thread dying"); | |
1330 | return NULL; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * This thread manage application registration. | |
1335 | */ | |
1336 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1337 | { |
5eb91c98 DG |
1338 | int sock = 0, i, ret, pollfd; |
1339 | uint32_t revents, nb_fd; | |
1340 | struct lttng_poll_event events; | |
099e26bd DG |
1341 | /* |
1342 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1343 | * freed in the manage apps thread. | |
1344 | */ | |
1345 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1346 | |
62d53818 | 1347 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1348 | |
099e26bd | 1349 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1350 | |
1351 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1352 | if (ret < 0) { | |
1353 | goto error; | |
1354 | } | |
1355 | ||
5eb91c98 DG |
1356 | /* |
1357 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1358 | * more will be added to this poll set. | |
1359 | */ | |
1360 | ret = create_thread_poll_set(&events, 2); | |
1361 | if (ret < 0) { | |
1362 | goto error; | |
1363 | } | |
273ea72c | 1364 | |
5eb91c98 DG |
1365 | /* Add the application registration socket */ |
1366 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1367 | if (ret < 0) { | |
1368 | goto error; | |
1369 | } | |
273ea72c | 1370 | |
1d4b027a | 1371 | /* Notify all applications to register */ |
0fdd1e2c DG |
1372 | ret = notify_ust_apps(1); |
1373 | if (ret < 0) { | |
1374 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1375 | "Execution continues but there might be problem for already\n" |
1376 | "running applications that wishes to register."); | |
0fdd1e2c | 1377 | } |
1d4b027a DG |
1378 | |
1379 | while (1) { | |
1380 | DBG("Accepting application registration"); | |
273ea72c | 1381 | |
62d53818 | 1382 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1383 | |
5eb91c98 DG |
1384 | nb_fd = LTTNG_POLL_GETNB(&events); |
1385 | ||
273ea72c | 1386 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1387 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1388 | if (ret < 0) { |
273ea72c DG |
1389 | goto error; |
1390 | } | |
1391 | ||
5eb91c98 DG |
1392 | for (i = 0; i < nb_fd; i++) { |
1393 | /* Fetch once the poll data */ | |
1394 | revents = LTTNG_POLL_GETEV(&events, i); | |
1395 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1396 | |
5eb91c98 DG |
1397 | /* Thread quit pipe has been closed. Killing thread. */ |
1398 | ret = check_thread_quit_pipe(pollfd, revents); | |
1399 | if (ret) { | |
90014c57 DG |
1400 | goto error; |
1401 | } | |
62d53818 | 1402 | |
5eb91c98 DG |
1403 | /* Event on the registration socket */ |
1404 | if (pollfd == apps_sock) { | |
1405 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1406 | ERR("Register apps socket poll error"); | |
1407 | goto error; | |
1408 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1409 | /* Registration starts here. Recording cycles */ |
1410 | tracepoint(ust_register_start); | |
1d4b027a | 1411 | |
5eb91c98 DG |
1412 | sock = lttcomm_accept_unix_sock(apps_sock); |
1413 | if (sock < 0) { | |
1414 | goto error; | |
1415 | } | |
099e26bd | 1416 | |
5eb91c98 | 1417 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1418 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1419 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1420 | perror("ust command zmalloc"); |
5eb91c98 DG |
1421 | goto error; |
1422 | } | |
1d4b027a | 1423 | |
5eb91c98 DG |
1424 | /* |
1425 | * Using message-based transmissions to ensure we don't | |
1426 | * have to deal with partially received messages. | |
1427 | */ | |
1428 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1429 | sizeof(struct ust_register_msg)); | |
1430 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1431 | if (ret < 0) { | |
1432 | perror("lttcomm_recv_unix_sock register apps"); | |
1433 | } else { | |
1434 | ERR("Wrong size received on apps register"); | |
1435 | } | |
1436 | free(ust_cmd); | |
1437 | close(sock); | |
1438 | continue; | |
1439 | } | |
099e26bd | 1440 | |
5eb91c98 | 1441 | ust_cmd->sock = sock; |
099e26bd | 1442 | |
5eb91c98 DG |
1443 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1444 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1445 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1446 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1447 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1448 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1449 | |
5eb91c98 DG |
1450 | /* |
1451 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1452 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1453 | */ |
1454 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1455 | |
5eb91c98 DG |
1456 | /* |
1457 | * Wake the registration queue futex. Implicit memory | |
1458 | * barrier with the exchange in cds_wfq_enqueue. | |
1459 | */ | |
1460 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1461 | |
1462 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1463 | } |
1464 | } | |
90014c57 | 1465 | } |
1d4b027a DG |
1466 | } |
1467 | ||
1468 | error: | |
0fdd1e2c DG |
1469 | DBG("UST Registration thread dying"); |
1470 | ||
1471 | /* Notify that the registration thread is gone */ | |
1472 | notify_ust_apps(0); | |
1473 | ||
1474 | close(apps_sock); | |
1475 | close(sock); | |
273ea72c | 1476 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1477 | |
5eb91c98 DG |
1478 | lttng_poll_clean(&events); |
1479 | ||
1d4b027a DG |
1480 | return NULL; |
1481 | } | |
1482 | ||
8c0faa1d | 1483 | /* |
3bd1e081 | 1484 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1485 | * exec or it will fails. |
8c0faa1d | 1486 | */ |
3bd1e081 | 1487 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1488 | { |
1489 | int ret; | |
ee0b0061 DG |
1490 | struct timespec timeout; |
1491 | ||
1492 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1493 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1494 | |
1495 | /* Setup semaphore */ | |
3bd1e081 | 1496 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1497 | if (ret < 0) { |
3bd1e081 | 1498 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1499 | goto error; |
1500 | } | |
8c0faa1d | 1501 | |
3bd1e081 MD |
1502 | ret = pthread_create(&consumer_data->thread, NULL, |
1503 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1504 | if (ret != 0) { |
3bd1e081 | 1505 | PERROR("pthread_create consumer"); |
ee0b0061 | 1506 | ret = -1; |
8c0faa1d DG |
1507 | goto error; |
1508 | } | |
1509 | ||
ee0b0061 DG |
1510 | /* Get time for sem_timedwait absolute timeout */ |
1511 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1512 | if (ret < 0) { | |
3bd1e081 | 1513 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1514 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1515 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1516 | } else { |
1517 | /* Normal timeout if the gettime was successful */ | |
1518 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1519 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1520 | } |
8c0faa1d | 1521 | |
ee0b0061 DG |
1522 | if (ret < 0) { |
1523 | if (errno == ETIMEDOUT) { | |
1524 | /* | |
1525 | * Call has timed out so we kill the kconsumerd_thread and return | |
1526 | * an error. | |
1527 | */ | |
3bd1e081 MD |
1528 | ERR("The consumer thread was never ready. Killing it"); |
1529 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1530 | if (ret < 0) { |
3bd1e081 | 1531 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1532 | } |
1533 | } else { | |
3bd1e081 | 1534 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1535 | } |
1536 | goto error; | |
1537 | } | |
1538 | ||
3bd1e081 MD |
1539 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1540 | if (consumer_data->pid == 0) { | |
712ea556 | 1541 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1542 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1543 | goto error; |
1544 | } | |
3bd1e081 | 1545 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1546 | |
8c0faa1d DG |
1547 | return 0; |
1548 | ||
1549 | error: | |
1550 | return ret; | |
1551 | } | |
1552 | ||
d9800920 | 1553 | /* |
3bd1e081 | 1554 | * Join consumer thread |
d9800920 | 1555 | */ |
3bd1e081 | 1556 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1557 | { |
1558 | void *status; | |
1559 | int ret; | |
1560 | ||
3bd1e081 MD |
1561 | if (consumer_data->pid != 0) { |
1562 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1563 | if (ret) { |
3bd1e081 | 1564 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1565 | return ret; |
1566 | } | |
3bd1e081 | 1567 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1568 | } else { |
1569 | return 0; | |
1570 | } | |
1571 | } | |
1572 | ||
8c0faa1d | 1573 | /* |
3bd1e081 | 1574 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1575 | * |
d063d709 | 1576 | * Return pid if successful else -1. |
8c0faa1d | 1577 | */ |
3bd1e081 | 1578 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1579 | { |
1580 | int ret; | |
1581 | pid_t pid; | |
94c55f17 | 1582 | const char *consumer_to_use; |
53086306 | 1583 | const char *verbosity; |
94c55f17 | 1584 | struct stat st; |
8c0faa1d | 1585 | |
3bd1e081 | 1586 | DBG("Spawning consumerd"); |
c49dc785 | 1587 | |
8c0faa1d DG |
1588 | pid = fork(); |
1589 | if (pid == 0) { | |
1590 | /* | |
3bd1e081 | 1591 | * Exec consumerd. |
8c0faa1d | 1592 | */ |
3bd1e081 | 1593 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1594 | verbosity = "--verbose"; |
1595 | } else { | |
1596 | verbosity = "--quiet"; | |
1597 | } | |
3bd1e081 MD |
1598 | switch (consumer_data->type) { |
1599 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1600 | /* |
f806231f MD |
1601 | * Find out which consumerd to execute. We will |
1602 | * first try the 64-bit path, then the | |
1603 | * sessiond's installation directory, and | |
1604 | * fallback on the 32-bit one, | |
94c55f17 AM |
1605 | */ |
1606 | if (stat(consumerd64_bin, &st) == 0) { | |
1607 | consumer_to_use = consumerd64_bin; | |
94c55f17 AM |
1608 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
1609 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
eb1e0bd4 MD |
1610 | } else if (stat(consumerd32_bin, &st) == 0) { |
1611 | consumer_to_use = consumerd32_bin; | |
94c55f17 AM |
1612 | } else { |
1613 | break; | |
1614 | } | |
1615 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1616 | execl(consumer_to_use, | |
1617 | "lttng-consumerd", verbosity, "-k", | |
1618 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1619 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1620 | NULL); | |
3bd1e081 | 1621 | break; |
7753dea8 MD |
1622 | case LTTNG_CONSUMER64_UST: |
1623 | { | |
b1e0b6b6 | 1624 | char *tmpnew = NULL; |
8f4905da MD |
1625 | |
1626 | if (consumerd64_libdir[0] != '\0') { | |
1627 | char *tmp; | |
1628 | size_t tmplen; | |
1629 | ||
1630 | tmp = getenv("LD_LIBRARY_PATH"); | |
1631 | if (!tmp) { | |
1632 | tmp = ""; | |
1633 | } | |
1634 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1635 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1636 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1637 | if (!tmpnew) { | |
1638 | ret = -ENOMEM; | |
1639 | goto error; | |
1640 | } | |
1641 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1642 | strcat(tmpnew, consumerd64_libdir); | |
1643 | if (tmp[0] != '\0') { | |
1644 | strcat(tmpnew, ":"); | |
1645 | strcat(tmpnew, tmp); | |
1646 | } | |
1647 | ret = putenv(tmpnew); | |
1648 | if (ret) { | |
1649 | ret = -errno; | |
1650 | goto error; | |
1651 | } | |
1652 | } | |
94c55f17 | 1653 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1654 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1655 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1656 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1657 | NULL); | |
8f4905da MD |
1658 | if (consumerd64_libdir[0] != '\0') { |
1659 | free(tmpnew); | |
1660 | } | |
1661 | if (ret) { | |
1662 | goto error; | |
1663 | } | |
3bd1e081 | 1664 | break; |
7753dea8 MD |
1665 | } |
1666 | case LTTNG_CONSUMER32_UST: | |
1667 | { | |
937dde8e | 1668 | char *tmpnew = NULL; |
8f4905da MD |
1669 | |
1670 | if (consumerd32_libdir[0] != '\0') { | |
1671 | char *tmp; | |
1672 | size_t tmplen; | |
1673 | ||
1674 | tmp = getenv("LD_LIBRARY_PATH"); | |
1675 | if (!tmp) { | |
1676 | tmp = ""; | |
1677 | } | |
1678 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1679 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1680 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1681 | if (!tmpnew) { | |
1682 | ret = -ENOMEM; | |
1683 | goto error; | |
1684 | } | |
1685 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1686 | strcat(tmpnew, consumerd32_libdir); | |
1687 | if (tmp[0] != '\0') { | |
1688 | strcat(tmpnew, ":"); | |
1689 | strcat(tmpnew, tmp); | |
1690 | } | |
1691 | ret = putenv(tmpnew); | |
1692 | if (ret) { | |
1693 | ret = -errno; | |
1694 | goto error; | |
1695 | } | |
1696 | } | |
94c55f17 | 1697 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1698 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1699 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1700 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1701 | NULL); | |
8f4905da MD |
1702 | if (consumerd32_libdir[0] != '\0') { |
1703 | free(tmpnew); | |
1704 | } | |
1705 | if (ret) { | |
1706 | goto error; | |
1707 | } | |
3bd1e081 | 1708 | break; |
7753dea8 | 1709 | } |
3bd1e081 MD |
1710 | default: |
1711 | perror("unknown consumer type"); | |
1712 | exit(EXIT_FAILURE); | |
1713 | } | |
8c0faa1d DG |
1714 | if (errno != 0) { |
1715 | perror("kernel start consumer exec"); | |
1716 | } | |
1717 | exit(EXIT_FAILURE); | |
1718 | } else if (pid > 0) { | |
1719 | ret = pid; | |
8c0faa1d | 1720 | } else { |
3bd1e081 | 1721 | perror("start consumer fork"); |
8c0faa1d | 1722 | ret = -errno; |
8c0faa1d | 1723 | } |
8f4905da | 1724 | error: |
8c0faa1d DG |
1725 | return ret; |
1726 | } | |
1727 | ||
693bd40b | 1728 | /* |
3bd1e081 | 1729 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1730 | */ |
3bd1e081 | 1731 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1732 | { |
1733 | int ret; | |
1734 | ||
3bd1e081 MD |
1735 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1736 | if (consumer_data->pid != 0) { | |
1737 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1738 | goto end; |
1739 | } | |
693bd40b | 1740 | |
3bd1e081 | 1741 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1742 | if (ret < 0) { |
3bd1e081 MD |
1743 | ERR("Spawning consumerd failed"); |
1744 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1745 | goto error; |
693bd40b | 1746 | } |
c49dc785 | 1747 | |
3bd1e081 MD |
1748 | /* Setting up the consumer_data pid */ |
1749 | consumer_data->pid = ret; | |
48842b30 | 1750 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1751 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1752 | |
3bd1e081 MD |
1753 | DBG2("Spawning consumer control thread"); |
1754 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1755 | if (ret < 0) { |
3bd1e081 | 1756 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1757 | goto error; |
1758 | } | |
1759 | ||
c49dc785 | 1760 | end: |
693bd40b DG |
1761 | return 0; |
1762 | ||
1763 | error: | |
1764 | return ret; | |
1765 | } | |
1766 | ||
b73401da | 1767 | /* |
d063d709 | 1768 | * modprobe_kernel_modules |
b73401da DG |
1769 | */ |
1770 | static int modprobe_kernel_modules(void) | |
1771 | { | |
ab147185 | 1772 | int ret = 0, i; |
b73401da DG |
1773 | char modprobe[256]; |
1774 | ||
ab147185 MD |
1775 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1776 | ret = snprintf(modprobe, sizeof(modprobe), | |
1777 | "/sbin/modprobe %s%s", | |
24b487b8 | 1778 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1779 | kernel_modules_list[i].name); |
b73401da DG |
1780 | if (ret < 0) { |
1781 | perror("snprintf modprobe"); | |
1782 | goto error; | |
1783 | } | |
ab147185 | 1784 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1785 | ret = system(modprobe); |
ab147185 MD |
1786 | if (ret == -1) { |
1787 | ERR("Unable to launch modprobe for module %s", | |
1788 | kernel_modules_list[i].name); | |
1789 | } else if (kernel_modules_list[i].required | |
d9800920 | 1790 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1791 | ERR("Unable to load module %s", |
1792 | kernel_modules_list[i].name); | |
1793 | } else { | |
1794 | DBG("Modprobe successfully %s", | |
1795 | kernel_modules_list[i].name); | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | error: | |
1800 | return ret; | |
1801 | } | |
1802 | ||
b73401da | 1803 | /* |
d063d709 | 1804 | * mount_debugfs |
b73401da DG |
1805 | */ |
1806 | static int mount_debugfs(char *path) | |
1807 | { | |
1808 | int ret; | |
1809 | char *type = "debugfs"; | |
1810 | ||
67f747d8 | 1811 | ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1812 | if (ret < 0) { |
7272acf5 | 1813 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1814 | goto error; |
1815 | } | |
1816 | ||
1817 | ret = mount(type, path, type, 0, NULL); | |
1818 | if (ret < 0) { | |
7272acf5 | 1819 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1820 | goto error; |
1821 | } | |
1822 | ||
1823 | DBG("Mounted debugfs successfully at %s", path); | |
1824 | ||
1825 | error: | |
1826 | return ret; | |
1827 | } | |
1828 | ||
8c0faa1d | 1829 | /* |
d063d709 | 1830 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1831 | */ |
f3ed775e | 1832 | static void init_kernel_tracer(void) |
8c0faa1d | 1833 | { |
b73401da DG |
1834 | int ret; |
1835 | char *proc_mounts = "/proc/mounts"; | |
1836 | char line[256]; | |
684d34d2 | 1837 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1838 | FILE *fp; |
1839 | ||
1840 | /* Detect debugfs */ | |
1841 | fp = fopen(proc_mounts, "r"); | |
1842 | if (fp == NULL) { | |
1843 | ERR("Unable to probe %s", proc_mounts); | |
1844 | goto error; | |
1845 | } | |
1846 | ||
1847 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1848 | if (strstr(line, "debugfs") != NULL) { | |
1849 | /* Remove first string */ | |
1850 | strtok(line, " "); | |
1851 | /* Dup string here so we can reuse line later on */ | |
1852 | debugfs_path = strdup(strtok(NULL, " ")); | |
1853 | DBG("Got debugfs path : %s", debugfs_path); | |
1854 | break; | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | fclose(fp); | |
1859 | ||
1860 | /* Mount debugfs if needded */ | |
1861 | if (debugfs_path == NULL) { | |
1862 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1863 | if (ret < 0) { | |
1864 | perror("asprintf debugfs path"); | |
1865 | goto error; | |
1866 | } | |
1867 | ret = mount_debugfs(debugfs_path); | |
1868 | if (ret < 0) { | |
7272acf5 | 1869 | perror("Cannot mount debugfs"); |
b73401da DG |
1870 | goto error; |
1871 | } | |
1872 | } | |
1873 | ||
1874 | /* Modprobe lttng kernel modules */ | |
1875 | ret = modprobe_kernel_modules(); | |
1876 | if (ret < 0) { | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | /* Setup lttng kernel path */ | |
1881 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1882 | if (ret < 0) { | |
1883 | perror("asprintf lttng path"); | |
1884 | goto error; | |
1885 | } | |
1886 | ||
1887 | /* Open debugfs lttng */ | |
1888 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1889 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1890 | DBG("Failed to open %s", lttng_path); |
1891 | goto error; | |
8c0faa1d DG |
1892 | } |
1893 | ||
b73401da DG |
1894 | free(lttng_path); |
1895 | free(debugfs_path); | |
f3ed775e | 1896 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1897 | return; |
1898 | ||
1899 | error: | |
1900 | if (lttng_path) { | |
1901 | free(lttng_path); | |
1902 | } | |
1903 | if (debugfs_path) { | |
1904 | free(debugfs_path); | |
1905 | } | |
1906 | WARN("No kernel tracer available"); | |
1907 | kernel_tracer_fd = 0; | |
1908 | return; | |
f3ed775e | 1909 | } |
33a2b854 | 1910 | |
f3ed775e | 1911 | /* |
54d01ffb | 1912 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1913 | */ |
54d01ffb | 1914 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1915 | { |
f40799e8 | 1916 | int ret = 0; |
8c0faa1d | 1917 | |
3bd1e081 | 1918 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1919 | /* |
54d01ffb DG |
1920 | * Assign default kernel consumer socket if no consumer assigned to the |
1921 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1922 | * an extra security check. | |
d9800920 DG |
1923 | */ |
1924 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1925 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1926 | } |
1927 | ||
2bdd86d4 | 1928 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1929 | if (ret < 0) { |
f3ed775e DG |
1930 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1931 | goto error; | |
1932 | } | |
1d4b027a | 1933 | |
3bd1e081 | 1934 | session->consumer_fds_sent = 1; |
f3ed775e | 1935 | } |
1d4b027a DG |
1936 | |
1937 | error: | |
1938 | return ret; | |
8c0faa1d DG |
1939 | } |
1940 | ||
0177d773 DG |
1941 | /* |
1942 | * Create an UST session and add it to the session ust list. | |
1943 | */ | |
44d3bd01 DG |
1944 | static int create_ust_session(struct ltt_session *session, |
1945 | struct lttng_domain *domain) | |
0177d773 | 1946 | { |
13384287 | 1947 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1948 | int ret; |
44d3bd01 DG |
1949 | |
1950 | switch (domain->type) { | |
48842b30 | 1951 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1952 | break; |
1953 | default: | |
13384287 | 1954 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1955 | goto error; |
1956 | } | |
0177d773 DG |
1957 | |
1958 | DBG("Creating UST session"); | |
1959 | ||
a991f516 | 1960 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1961 | if (lus == NULL) { |
44d3bd01 | 1962 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1963 | goto error; |
1964 | } | |
1965 | ||
67f747d8 | 1966 | ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1967 | session->uid, session->gid); |
0177d773 DG |
1968 | if (ret < 0) { |
1969 | if (ret != -EEXIST) { | |
1970 | ERR("Trace directory creation error"); | |
44d3bd01 | 1971 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1972 | goto error; |
1973 | } | |
1974 | } | |
1975 | ||
f6a9efaa DG |
1976 | /* The domain type dictate different actions on session creation */ |
1977 | switch (domain->type) { | |
48842b30 DG |
1978 | case LTTNG_DOMAIN_UST: |
1979 | /* No ustctl for the global UST domain */ | |
1980 | break; | |
1981 | default: | |
36dc12cc | 1982 | ERR("Unknown UST domain on create session %d", domain->type); |
0177d773 DG |
1983 | goto error; |
1984 | } | |
6df2e2c9 MD |
1985 | lus->uid = session->uid; |
1986 | lus->gid = session->gid; | |
f6a9efaa | 1987 | session->ust_session = lus; |
44d3bd01 DG |
1988 | |
1989 | return LTTCOMM_OK; | |
0177d773 DG |
1990 | |
1991 | error: | |
1992 | free(lus); | |
1993 | return ret; | |
1994 | } | |
1995 | ||
333f285e | 1996 | /* |
d063d709 | 1997 | * Create a kernel tracer session then create the default channel. |
333f285e | 1998 | */ |
f3ed775e | 1999 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2000 | { |
f3ed775e | 2001 | int ret; |
f3ed775e DG |
2002 | |
2003 | DBG("Creating kernel session"); | |
2004 | ||
2005 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2006 | if (ret < 0) { | |
2007 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2008 | goto error; | |
333f285e DG |
2009 | } |
2010 | ||
d9800920 | 2011 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
2012 | if (kconsumer_data.cmd_sock) { |
2013 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
2014 | } |
2015 | ||
67f747d8 | 2016 | ret = mkdir_recursive_run_as(session->kernel_session->trace_path, |
6df2e2c9 | 2017 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2018 | if (ret < 0) { |
996b65c8 | 2019 | if (ret != -EEXIST) { |
7a485870 DG |
2020 | ERR("Trace directory creation error"); |
2021 | goto error; | |
2022 | } | |
2023 | } | |
6df2e2c9 MD |
2024 | session->kernel_session->uid = session->uid; |
2025 | session->kernel_session->gid = session->gid; | |
7a485870 | 2026 | |
f3ed775e DG |
2027 | error: |
2028 | return ret; | |
333f285e DG |
2029 | } |
2030 | ||
8e0af1b4 MD |
2031 | /* |
2032 | * Check if the UID or GID match the session. Root user has access to | |
2033 | * all sessions. | |
2034 | */ | |
2035 | static int session_access_ok(struct ltt_session *session, | |
2036 | uid_t uid, gid_t gid) | |
2037 | { | |
2038 | if (uid != session->uid && gid != session->gid | |
2039 | && uid != 0) { | |
2040 | return 0; | |
2041 | } else { | |
2042 | return 1; | |
2043 | } | |
2044 | } | |
2045 | ||
2046 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2047 | { | |
2048 | unsigned int i = 0; | |
2049 | struct ltt_session *session; | |
2050 | ||
2051 | DBG("Counting number of available session for UID %d GID %d", | |
2052 | uid, gid); | |
2053 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2054 | /* | |
2055 | * Only list the sessions the user can control. | |
2056 | */ | |
2057 | if (!session_access_ok(session, uid, gid)) { | |
2058 | continue; | |
2059 | } | |
2060 | i++; | |
2061 | } | |
2062 | return i; | |
2063 | } | |
2064 | ||
6c9cc2ab DG |
2065 | /* |
2066 | * Using the session list, filled a lttng_session array to send back to the | |
2067 | * client for session listing. | |
2068 | * | |
2069 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2070 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2071 | */ |
8e0af1b4 MD |
2072 | static void list_lttng_sessions(struct lttng_session *sessions, |
2073 | uid_t uid, gid_t gid) | |
6c9cc2ab | 2074 | { |
8e0af1b4 | 2075 | unsigned int i = 0; |
6c9cc2ab DG |
2076 | struct ltt_session *session; |
2077 | ||
8e0af1b4 MD |
2078 | DBG("Getting all available session for UID %d GID %d", |
2079 | uid, gid); | |
6c9cc2ab DG |
2080 | /* |
2081 | * Iterate over session list and append data after the control struct in | |
2082 | * the buffer. | |
2083 | */ | |
2084 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2085 | /* |
2086 | * Only list the sessions the user can control. | |
2087 | */ | |
2088 | if (!session_access_ok(session, uid, gid)) { | |
2089 | continue; | |
2090 | } | |
6c9cc2ab | 2091 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2092 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2093 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2094 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2095 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2096 | i++; |
2097 | } | |
2098 | } | |
2099 | ||
9f19cc17 DG |
2100 | /* |
2101 | * Fill lttng_channel array of all channels. | |
2102 | */ | |
b551a063 | 2103 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2104 | struct lttng_channel *channels) |
2105 | { | |
2106 | int i = 0; | |
2107 | struct ltt_kernel_channel *kchan; | |
2108 | ||
2109 | DBG("Listing channels for session %s", session->name); | |
2110 | ||
b551a063 DG |
2111 | switch (domain) { |
2112 | case LTTNG_DOMAIN_KERNEL: | |
2113 | /* Kernel channels */ | |
2114 | if (session->kernel_session != NULL) { | |
2115 | cds_list_for_each_entry(kchan, | |
2116 | &session->kernel_session->channel_list.head, list) { | |
2117 | /* Copy lttng_channel struct to array */ | |
2118 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2119 | channels[i].enabled = kchan->enabled; | |
2120 | i++; | |
2121 | } | |
2122 | } | |
2123 | break; | |
2124 | case LTTNG_DOMAIN_UST: | |
2125 | { | |
bec39940 | 2126 | struct lttng_ht_iter iter; |
b551a063 DG |
2127 | struct ltt_ust_channel *uchan; |
2128 | ||
bec39940 DG |
2129 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2130 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2131 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2132 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2133 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2134 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2135 | channels[i].attr.switch_timer_interval = | |
2136 | uchan->attr.switch_timer_interval; | |
2137 | channels[i].attr.read_timer_interval = | |
2138 | uchan->attr.read_timer_interval; | |
aea829b3 | 2139 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2140 | switch (uchan->attr.output) { |
2141 | case LTTNG_UST_MMAP: | |
2142 | default: | |
2143 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2144 | break; | |
2145 | } | |
9f19cc17 DG |
2146 | i++; |
2147 | } | |
b551a063 DG |
2148 | break; |
2149 | } | |
2150 | default: | |
2151 | break; | |
9f19cc17 | 2152 | } |
b551a063 | 2153 | } |
9f19cc17 | 2154 | |
b551a063 DG |
2155 | /* |
2156 | * Create a list of ust global domain events. | |
2157 | */ | |
2158 | static int list_lttng_ust_global_events(char *channel_name, | |
2159 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2160 | { | |
2161 | int i = 0, ret = 0; | |
2162 | unsigned int nb_event = 0; | |
bec39940 DG |
2163 | struct lttng_ht_iter iter; |
2164 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2165 | struct ltt_ust_channel *uchan; |
2166 | struct ltt_ust_event *uevent; | |
2167 | struct lttng_event *tmp; | |
2168 | ||
2169 | DBG("Listing UST global events for channel %s", channel_name); | |
2170 | ||
2171 | rcu_read_lock(); | |
2172 | ||
bec39940 DG |
2173 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2174 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2175 | if (node == NULL) { |
2176 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2177 | goto error; | |
b551a063 DG |
2178 | } |
2179 | ||
bec39940 | 2180 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2181 | |
bec39940 | 2182 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2183 | |
b551a063 DG |
2184 | if (nb_event == 0) { |
2185 | ret = nb_event; | |
2186 | goto error; | |
2187 | } | |
2188 | ||
2189 | DBG3("Listing UST global %d events", nb_event); | |
2190 | ||
2191 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2192 | if (tmp == NULL) { | |
2193 | ret = -LTTCOMM_FATAL; | |
2194 | goto error; | |
2195 | } | |
2196 | ||
bec39940 | 2197 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2198 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2199 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2200 | tmp[i].enabled = uevent->enabled; | |
2201 | switch (uevent->attr.instrumentation) { | |
2202 | case LTTNG_UST_TRACEPOINT: | |
2203 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2204 | break; | |
2205 | case LTTNG_UST_PROBE: | |
2206 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2207 | break; | |
2208 | case LTTNG_UST_FUNCTION: | |
2209 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2210 | break; | |
ac3bd9c0 | 2211 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2212 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2213 | break; |
9f19cc17 | 2214 | } |
d7b75b30 | 2215 | i++; |
9f19cc17 DG |
2216 | } |
2217 | ||
b551a063 DG |
2218 | ret = nb_event; |
2219 | *events = tmp; | |
2220 | ||
2221 | error: | |
2222 | rcu_read_unlock(); | |
2223 | return ret; | |
9f19cc17 DG |
2224 | } |
2225 | ||
2226 | /* | |
b551a063 | 2227 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2228 | */ |
b551a063 DG |
2229 | static int list_lttng_kernel_events(char *channel_name, |
2230 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2231 | { |
b551a063 DG |
2232 | int i = 0, ret; |
2233 | unsigned int nb_event; | |
9f19cc17 | 2234 | struct ltt_kernel_event *event; |
b551a063 DG |
2235 | struct ltt_kernel_channel *kchan; |
2236 | ||
2237 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2238 | if (kchan == NULL) { | |
2239 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2240 | goto error; | |
2241 | } | |
2242 | ||
2243 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2244 | |
2245 | DBG("Listing events for channel %s", kchan->channel->name); | |
2246 | ||
b551a063 DG |
2247 | if (nb_event == 0) { |
2248 | ret = nb_event; | |
2249 | goto error; | |
2250 | } | |
2251 | ||
2252 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2253 | if (*events == NULL) { | |
2254 | ret = LTTCOMM_FATAL; | |
2255 | goto error; | |
2256 | } | |
2257 | ||
9f19cc17 DG |
2258 | /* Kernel channels */ |
2259 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2260 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2261 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2262 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2263 | switch (event->event->instrumentation) { |
2264 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2265 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2266 | break; |
2267 | case LTTNG_KERNEL_KPROBE: | |
2268 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2269 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2270 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2271 | sizeof(struct lttng_kernel_kprobe)); |
2272 | break; | |
2273 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2274 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2275 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2276 | sizeof(struct lttng_kernel_function)); |
2277 | break; | |
0133c199 | 2278 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2279 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2280 | break; |
a54bd42d | 2281 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2282 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2283 | break; |
7a3d1328 MD |
2284 | case LTTNG_KERNEL_ALL: |
2285 | assert(0); | |
2286 | break; | |
9f19cc17 DG |
2287 | } |
2288 | i++; | |
2289 | } | |
b551a063 DG |
2290 | |
2291 | return nb_event; | |
2292 | ||
2293 | error: | |
2294 | return ret; | |
9f19cc17 DG |
2295 | } |
2296 | ||
fac6795d | 2297 | /* |
54d01ffb | 2298 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2299 | */ |
54d01ffb DG |
2300 | static int cmd_disable_channel(struct ltt_session *session, |
2301 | int domain, char *channel_name) | |
fac6795d | 2302 | { |
54d01ffb | 2303 | int ret; |
78f0bacd DG |
2304 | struct ltt_ust_session *usess; |
2305 | ||
2306 | usess = session->ust_session; | |
379473d2 | 2307 | |
54d01ffb | 2308 | switch (domain) { |
78f0bacd DG |
2309 | case LTTNG_DOMAIN_KERNEL: |
2310 | { | |
2311 | ret = channel_kernel_disable(session->kernel_session, | |
2312 | channel_name); | |
2313 | if (ret != LTTCOMM_OK) { | |
2314 | goto error; | |
2315 | } | |
54d01ffb | 2316 | |
78f0bacd DG |
2317 | kernel_wait_quiescent(kernel_tracer_fd); |
2318 | break; | |
2319 | } | |
2320 | case LTTNG_DOMAIN_UST: | |
2321 | { | |
2322 | struct ltt_ust_channel *uchan; | |
bec39940 | 2323 | struct lttng_ht *chan_ht; |
78f0bacd | 2324 | |
7885e399 DG |
2325 | chan_ht = usess->domain_global.channels; |
2326 | ||
2327 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2328 | if (uchan == NULL) { |
2329 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2330 | goto error; |
78f0bacd DG |
2331 | } |
2332 | ||
7885e399 DG |
2333 | ret = channel_ust_disable(usess, domain, uchan); |
2334 | if (ret != LTTCOMM_OK) { | |
54d01ffb | 2335 | goto error; |
78f0bacd | 2336 | } |
78f0bacd DG |
2337 | break; |
2338 | } | |
2339 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2340 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2341 | case LTTNG_DOMAIN_UST_PID: | |
2342 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2343 | goto error; | |
2344 | default: | |
2345 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2346 | goto error; | |
20fe2104 DG |
2347 | } |
2348 | ||
54d01ffb | 2349 | ret = LTTCOMM_OK; |
d65106b1 | 2350 | |
54d01ffb DG |
2351 | error: |
2352 | return ret; | |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2357 | */ | |
44d3bd01 | 2358 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2359 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2360 | { |
2361 | int ret; | |
f6a9efaa | 2362 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2363 | struct lttng_ht *chan_ht; |
f6a9efaa | 2364 | |
5d56b5aa | 2365 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2366 | |
aea829b3 | 2367 | switch (domain) { |
44d3bd01 DG |
2368 | case LTTNG_DOMAIN_KERNEL: |
2369 | { | |
2370 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2371 | |
44d3bd01 DG |
2372 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2373 | session->kernel_session); | |
2374 | if (kchan == NULL) { | |
2375 | ret = channel_kernel_create(session->kernel_session, | |
2376 | attr, kernel_poll_pipe[1]); | |
2377 | } else { | |
2378 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2379 | } | |
2380 | ||
2381 | if (ret != LTTCOMM_OK) { | |
2382 | goto error; | |
2383 | } | |
2384 | ||
2385 | kernel_wait_quiescent(kernel_tracer_fd); | |
2386 | break; | |
2387 | } | |
f6a9efaa DG |
2388 | case LTTNG_DOMAIN_UST: |
2389 | { | |
2390 | struct ltt_ust_channel *uchan; | |
2391 | ||
7885e399 | 2392 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2393 | |
7885e399 | 2394 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2395 | if (uchan == NULL) { |
7885e399 | 2396 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2397 | } else { |
7885e399 | 2398 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2399 | } |
f6a9efaa DG |
2400 | break; |
2401 | } | |
78f0bacd DG |
2402 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2403 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2404 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2405 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2406 | goto error; | |
44d3bd01 DG |
2407 | default: |
2408 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2409 | goto error; | |
54d01ffb DG |
2410 | } |
2411 | ||
54d01ffb DG |
2412 | error: |
2413 | return ret; | |
2414 | } | |
2415 | ||
2416 | /* | |
2417 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2418 | */ | |
2419 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2420 | char *channel_name, char *event_name) | |
2421 | { | |
2422 | int ret; | |
54d01ffb DG |
2423 | |
2424 | switch (domain) { | |
2425 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2426 | { |
2427 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2428 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2429 | |
b0a40d28 DG |
2430 | ksess = session->kernel_session; |
2431 | ||
2432 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2433 | if (kchan == NULL) { |
2434 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2435 | goto error; | |
d65106b1 DG |
2436 | } |
2437 | ||
b0a40d28 | 2438 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2439 | if (ret != LTTCOMM_OK) { |
2440 | goto error; | |
2441 | } | |
2442 | ||
2443 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2444 | break; |
2bdd86d4 MD |
2445 | } |
2446 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2447 | { |
b0a40d28 | 2448 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2449 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2450 | |
2451 | usess = session->ust_session; | |
2452 | ||
2453 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2454 | channel_name); | |
2455 | if (uchan == NULL) { | |
2456 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2457 | goto error; | |
2458 | } | |
2459 | ||
7f79d3a1 DG |
2460 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2461 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2462 | goto error; |
2463 | } | |
2464 | ||
7f79d3a1 | 2465 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2466 | channel_name); |
b0a40d28 DG |
2467 | break; |
2468 | } | |
2bdd86d4 MD |
2469 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2470 | case LTTNG_DOMAIN_UST_PID: | |
2471 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2472 | default: |
54d01ffb DG |
2473 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2474 | goto error; | |
d65106b1 | 2475 | } |
26cc6b4e | 2476 | |
54d01ffb DG |
2477 | ret = LTTCOMM_OK; |
2478 | ||
2479 | error: | |
2480 | return ret; | |
2481 | } | |
2482 | ||
2483 | /* | |
2484 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2485 | */ | |
2486 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2487 | char *channel_name) | |
2488 | { | |
2489 | int ret; | |
54d01ffb DG |
2490 | |
2491 | switch (domain) { | |
2492 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2493 | { |
2494 | struct ltt_kernel_session *ksess; | |
2495 | struct ltt_kernel_channel *kchan; | |
2496 | ||
2497 | ksess = session->kernel_session; | |
2498 | ||
2499 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2500 | if (kchan == NULL) { |
2501 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2502 | goto error; | |
26cc6b4e DG |
2503 | } |
2504 | ||
9730260e | 2505 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2506 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2507 | goto error; |
26cc6b4e DG |
2508 | } |
2509 | ||
54d01ffb | 2510 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2511 | break; |
9730260e DG |
2512 | } |
2513 | case LTTNG_DOMAIN_UST: | |
2514 | { | |
2515 | struct ltt_ust_session *usess; | |
2516 | struct ltt_ust_channel *uchan; | |
2517 | ||
2518 | usess = session->ust_session; | |
2519 | ||
2520 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2521 | channel_name); | |
2522 | if (uchan == NULL) { | |
2523 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2524 | goto error; | |
2525 | } | |
2526 | ||
7f79d3a1 DG |
2527 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2528 | if (ret != 0) { | |
9730260e DG |
2529 | goto error; |
2530 | } | |
2531 | ||
7f79d3a1 | 2532 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2533 | |
2534 | break; | |
2535 | } | |
2536 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2537 | case LTTNG_DOMAIN_UST_PID: | |
2538 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2539 | default: |
54d01ffb DG |
2540 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2541 | goto error; | |
26cc6b4e | 2542 | } |
e953ef25 | 2543 | |
54d01ffb | 2544 | ret = LTTCOMM_OK; |
e953ef25 | 2545 | |
54d01ffb DG |
2546 | error: |
2547 | return ret; | |
2548 | } | |
f5177a38 | 2549 | |
54d01ffb DG |
2550 | /* |
2551 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2552 | */ | |
2553 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2554 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2555 | { | |
2556 | int ret; | |
f5177a38 | 2557 | |
54d01ffb DG |
2558 | switch (domain) { |
2559 | case LTTNG_DOMAIN_KERNEL: | |
2560 | /* Add kernel context to kernel tracer */ | |
2561 | ret = context_kernel_add(session->kernel_session, ctx, | |
2562 | event_name, channel_name); | |
2563 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2564 | goto error; |
e953ef25 | 2565 | } |
2bdd86d4 MD |
2566 | break; |
2567 | case LTTNG_DOMAIN_UST: | |
2568 | { | |
55cc08a6 | 2569 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2570 | |
55cc08a6 DG |
2571 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2572 | if (ret != LTTCOMM_OK) { | |
2573 | goto error; | |
2bdd86d4 | 2574 | } |
e953ef25 | 2575 | break; |
2bdd86d4 | 2576 | } |
55cc08a6 DG |
2577 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2578 | case LTTNG_DOMAIN_UST_PID: | |
2579 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2580 | default: |
54d01ffb DG |
2581 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2582 | goto error; | |
e953ef25 | 2583 | } |
950131af | 2584 | |
54d01ffb | 2585 | ret = LTTCOMM_OK; |
950131af | 2586 | |
54d01ffb DG |
2587 | error: |
2588 | return ret; | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2593 | * |
2594 | * TODO: currently, both events and loglevels are kept within the same | |
2595 | * namespace for UST global registry/app registery, so if an event | |
2596 | * happen to have the same name as the loglevel (very unlikely though), | |
2597 | * and an attempt is made to enable/disable both in the same session, | |
2598 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2599 | */ |
2600 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2601 | char *channel_name, struct lttng_event *event) | |
2602 | { | |
2603 | int ret; | |
f6cd6b0f | 2604 | struct lttng_channel *attr; |
48842b30 | 2605 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2606 | |
2607 | switch (domain) { | |
2608 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2609 | { |
2610 | struct ltt_kernel_channel *kchan; | |
2611 | ||
54d01ffb DG |
2612 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2613 | session->kernel_session); | |
2614 | if (kchan == NULL) { | |
f6cd6b0f DG |
2615 | attr = channel_new_default_attr(domain); |
2616 | if (attr == NULL) { | |
2617 | ret = LTTCOMM_FATAL; | |
2618 | goto error; | |
2619 | } | |
2620 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2621 | ||
54d01ffb | 2622 | /* This call will notify the kernel thread */ |
44d3bd01 | 2623 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2624 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2625 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2626 | free(attr); |
f5177a38 DG |
2627 | goto error; |
2628 | } | |
ff4d74e6 | 2629 | free(attr); |
54d01ffb | 2630 | } |
950131af | 2631 | |
54d01ffb DG |
2632 | /* Get the newly created kernel channel pointer */ |
2633 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2634 | session->kernel_session); | |
2635 | if (kchan == NULL) { | |
2636 | /* This sould not happen... */ | |
2637 | ret = LTTCOMM_FATAL; | |
2638 | goto error; | |
2639 | } | |
f5177a38 | 2640 | |
48842b30 DG |
2641 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2642 | event); | |
54d01ffb | 2643 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2644 | goto error; |
950131af DG |
2645 | } |
2646 | ||
54d01ffb | 2647 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2648 | break; |
2bdd86d4 MD |
2649 | } |
2650 | case LTTNG_DOMAIN_UST: | |
2651 | { | |
aea829b3 | 2652 | struct lttng_channel *attr; |
48842b30 | 2653 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2654 | |
edb67388 | 2655 | /* Get channel from global UST domain */ |
48842b30 DG |
2656 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2657 | channel_name); | |
2658 | if (uchan == NULL) { | |
aea829b3 DG |
2659 | /* Create default channel */ |
2660 | attr = channel_new_default_attr(domain); | |
2661 | if (attr == NULL) { | |
2662 | ret = LTTCOMM_FATAL; | |
2663 | goto error; | |
2664 | } | |
596219f7 | 2665 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2666 | attr->name[NAME_MAX - 1] = '\0'; |
2bdd86d4 | 2667 | |
7885e399 | 2668 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2669 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2670 | free(attr); |
aea829b3 DG |
2671 | goto error; |
2672 | } | |
aea829b3 DG |
2673 | free(attr); |
2674 | ||
2675 | /* Get the newly created channel reference back */ | |
2676 | uchan = trace_ust_find_channel_by_name( | |
2677 | usess->domain_global.channels, channel_name); | |
2678 | if (uchan == NULL) { | |
2679 | /* Something is really wrong */ | |
2bdd86d4 MD |
2680 | ret = LTTCOMM_FATAL; |
2681 | goto error; | |
2682 | } | |
48842b30 | 2683 | } |
2bdd86d4 | 2684 | |
edb67388 | 2685 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2686 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2687 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2688 | goto error; |
2bdd86d4 MD |
2689 | } |
2690 | break; | |
2691 | } | |
2692 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2693 | case LTTNG_DOMAIN_UST_PID: | |
2694 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2695 | default: |
54d01ffb DG |
2696 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2697 | goto error; | |
950131af | 2698 | } |
d36b8583 | 2699 | |
54d01ffb | 2700 | ret = LTTCOMM_OK; |
d36b8583 | 2701 | |
54d01ffb DG |
2702 | error: |
2703 | return ret; | |
2704 | } | |
7d29a247 | 2705 | |
54d01ffb DG |
2706 | /* |
2707 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2708 | */ | |
2709 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2710 | char *channel_name, int event_type) |
54d01ffb DG |
2711 | { |
2712 | int ret; | |
2713 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2714 | |
54d01ffb DG |
2715 | switch (domain) { |
2716 | case LTTNG_DOMAIN_KERNEL: | |
2717 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2718 | session->kernel_session); | |
2719 | if (kchan == NULL) { | |
2720 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2721 | ret = channel_kernel_create(session->kernel_session, NULL, |
2722 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2723 | if (ret != LTTCOMM_OK) { |
2724 | goto error; | |
d36b8583 | 2725 | } |
0d0c377a | 2726 | |
8f69e5eb DG |
2727 | /* Get the newly created kernel channel pointer */ |
2728 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2729 | session->kernel_session); | |
2730 | if (kchan == NULL) { | |
2731 | /* This sould not happen... */ | |
2732 | ret = LTTCOMM_FATAL; | |
2733 | goto error; | |
2734 | } | |
2735 | ||
54d01ffb | 2736 | } |
0fdd1e2c | 2737 | |
7a3d1328 | 2738 | switch (event_type) { |
76d45b40 | 2739 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2740 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2741 | kchan, kernel_tracer_fd); |
7a3d1328 | 2742 | break; |
76d45b40 | 2743 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2744 | /* |
7a3d1328 MD |
2745 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2746 | * events already registered to the channel. | |
8c9ae521 | 2747 | */ |
7a3d1328 MD |
2748 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2749 | kchan, kernel_tracer_fd); | |
2750 | break; | |
76d45b40 | 2751 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2752 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2753 | ret = event_kernel_enable_all(session->kernel_session, |
2754 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2755 | break; |
2756 | default: | |
2757 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2758 | goto error; | |
8c9ae521 | 2759 | } |
8f69e5eb DG |
2760 | |
2761 | /* Manage return value */ | |
54d01ffb | 2762 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2763 | goto error; |
d36b8583 DG |
2764 | } |
2765 | ||
54d01ffb | 2766 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2767 | break; |
76d45b40 DG |
2768 | case LTTNG_DOMAIN_UST: |
2769 | { | |
2770 | struct lttng_channel *attr; | |
2771 | struct ltt_ust_channel *uchan; | |
2772 | struct ltt_ust_session *usess = session->ust_session; | |
2773 | ||
2774 | /* Get channel from global UST domain */ | |
2775 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2776 | channel_name); | |
2777 | if (uchan == NULL) { | |
2778 | /* Create default channel */ | |
2779 | attr = channel_new_default_attr(domain); | |
2780 | if (attr == NULL) { | |
2781 | ret = LTTCOMM_FATAL; | |
2782 | goto error; | |
2783 | } | |
2784 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2785 | attr->name[NAME_MAX - 1] = '\0'; | |
2786 | ||
2787 | /* Use the internal command enable channel */ | |
7885e399 | 2788 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2789 | if (ret != LTTCOMM_OK) { |
2790 | free(attr); | |
2791 | goto error; | |
2792 | } | |
2793 | free(attr); | |
2794 | ||
2795 | /* Get the newly created channel reference back */ | |
2796 | uchan = trace_ust_find_channel_by_name( | |
2797 | usess->domain_global.channels, channel_name); | |
2798 | if (uchan == NULL) { | |
2799 | /* Something is really wrong */ | |
2800 | ret = LTTCOMM_FATAL; | |
2801 | goto error; | |
2802 | } | |
2803 | } | |
2804 | ||
2805 | /* At this point, the session and channel exist on the tracer */ | |
2806 | ||
2807 | switch (event_type) { | |
2808 | case LTTNG_EVENT_ALL: | |
2809 | case LTTNG_EVENT_TRACEPOINT: | |
2810 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2811 | if (ret != LTTCOMM_OK) { | |
2812 | goto error; | |
2813 | } | |
2814 | break; | |
2815 | default: | |
2816 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2817 | goto error; | |
2818 | } | |
2819 | ||
2820 | /* Manage return value */ | |
2821 | if (ret != LTTCOMM_OK) { | |
2822 | goto error; | |
2823 | } | |
2824 | ||
2825 | break; | |
2826 | } | |
2827 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2828 | case LTTNG_DOMAIN_UST_PID: | |
2829 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2830 | default: |
54d01ffb DG |
2831 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2832 | goto error; | |
d36b8583 | 2833 | } |
f3ed775e | 2834 | |
54d01ffb DG |
2835 | ret = LTTCOMM_OK; |
2836 | ||
2837 | error: | |
2838 | return ret; | |
2839 | } | |
2840 | ||
2841 | /* | |
2842 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2843 | */ | |
2844 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2845 | { | |
2846 | int ret; | |
2847 | ssize_t nb_events = 0; | |
2848 | ||
2849 | switch (domain) { | |
2850 | case LTTNG_DOMAIN_KERNEL: | |
2851 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2852 | if (nb_events < 0) { | |
2853 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2854 | goto error; | |
894be886 | 2855 | } |
54d01ffb | 2856 | break; |
b551a063 DG |
2857 | case LTTNG_DOMAIN_UST: |
2858 | nb_events = ust_app_list_events(events); | |
2859 | if (nb_events < 0) { | |
2860 | ret = LTTCOMM_UST_LIST_FAIL; | |
2861 | goto error; | |
2862 | } | |
2863 | break; | |
54d01ffb | 2864 | default: |
54d01ffb DG |
2865 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2866 | goto error; | |
2867 | } | |
894be886 | 2868 | |
54d01ffb | 2869 | return nb_events; |
7d29a247 | 2870 | |
54d01ffb DG |
2871 | error: |
2872 | /* Return negative value to differentiate return code */ | |
2873 | return -ret; | |
2874 | } | |
b389abbe | 2875 | |
54d01ffb DG |
2876 | /* |
2877 | * Command LTTNG_START_TRACE processed by the client thread. | |
2878 | */ | |
2879 | static int cmd_start_trace(struct ltt_session *session) | |
2880 | { | |
2881 | int ret; | |
54d01ffb | 2882 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2883 | struct ltt_ust_session *usess; |
b389abbe | 2884 | |
54d01ffb DG |
2885 | /* Short cut */ |
2886 | ksession = session->kernel_session; | |
b9d9b220 | 2887 | usess = session->ust_session; |
5eb91c98 | 2888 | |
b9ef1c83 DG |
2889 | if (session->enabled) { |
2890 | ret = LTTCOMM_UST_START_FAIL; | |
2891 | goto error; | |
2892 | } | |
2893 | ||
464dd62d | 2894 | session->enabled = 1; |
5eb91c98 | 2895 | |
54d01ffb DG |
2896 | /* Kernel tracing */ |
2897 | if (ksession != NULL) { | |
2bdd86d4 MD |
2898 | struct ltt_kernel_channel *kchan; |
2899 | ||
54d01ffb DG |
2900 | /* Open kernel metadata */ |
2901 | if (ksession->metadata == NULL) { | |
2902 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2903 | if (ret < 0) { | |
2904 | ret = LTTCOMM_KERN_META_FAIL; | |
2905 | goto error; | |
b389abbe | 2906 | } |
54d01ffb | 2907 | } |
7d29a247 | 2908 | |
54d01ffb DG |
2909 | /* Open kernel metadata stream */ |
2910 | if (ksession->metadata_stream_fd == 0) { | |
2911 | ret = kernel_open_metadata_stream(ksession); | |
2912 | if (ret < 0) { | |
2913 | ERR("Kernel create metadata stream failed"); | |
2914 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2915 | goto error; | |
2916 | } | |
2917 | } | |
2918 | ||
2919 | /* For each channel */ | |
2920 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2921 | if (kchan->stream_count == 0) { | |
2922 | ret = kernel_open_channel_stream(kchan); | |
2923 | if (ret < 0) { | |
2924 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2925 | goto error; |
2926 | } | |
54d01ffb DG |
2927 | /* Update the stream global counter */ |
2928 | ksession->stream_count_global += ret; | |
7d29a247 | 2929 | } |
54d01ffb DG |
2930 | } |
2931 | ||
2932 | /* Setup kernel consumer socket and send fds to it */ | |
2933 | ret = init_kernel_tracing(ksession); | |
2934 | if (ret < 0) { | |
2935 | ret = LTTCOMM_KERN_START_FAIL; | |
2936 | goto error; | |
2937 | } | |
2938 | ||
2939 | /* This start the kernel tracing */ | |
2940 | ret = kernel_start_session(ksession); | |
2941 | if (ret < 0) { | |
2942 | ret = LTTCOMM_KERN_START_FAIL; | |
2943 | goto error; | |
2944 | } | |
2945 | ||
2946 | /* Quiescent wait after starting trace */ | |
2947 | kernel_wait_quiescent(kernel_tracer_fd); | |
2948 | } | |
2949 | ||
36dc12cc | 2950 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2951 | if (usess) { |
2952 | usess->start_trace = 1; | |
36dc12cc | 2953 | |
b9d9b220 DG |
2954 | ret = ust_app_start_trace_all(usess); |
2955 | if (ret < 0) { | |
2956 | ret = LTTCOMM_UST_START_FAIL; | |
2957 | goto error; | |
2958 | } | |
2bdd86d4 | 2959 | } |
54d01ffb DG |
2960 | |
2961 | ret = LTTCOMM_OK; | |
2962 | ||
2963 | error: | |
2964 | return ret; | |
2965 | } | |
2966 | ||
2967 | /* | |
2968 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2969 | */ | |
2970 | static int cmd_stop_trace(struct ltt_session *session) | |
2971 | { | |
2972 | int ret; | |
2973 | struct ltt_kernel_channel *kchan; | |
2974 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2975 | struct ltt_ust_session *usess; |
54d01ffb DG |
2976 | |
2977 | /* Short cut */ | |
2978 | ksession = session->kernel_session; | |
8be98f9a | 2979 | usess = session->ust_session; |
54d01ffb | 2980 | |
b9ef1c83 DG |
2981 | if (!session->enabled) { |
2982 | ret = LTTCOMM_UST_START_FAIL; | |
2983 | goto error; | |
2984 | } | |
2985 | ||
464dd62d | 2986 | session->enabled = 0; |
54d01ffb DG |
2987 | |
2988 | /* Kernel tracer */ | |
2989 | if (ksession != NULL) { | |
2990 | DBG("Stop kernel tracing"); | |
2991 | ||
2992 | /* Flush all buffers before stopping */ | |
2993 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2994 | if (ret < 0) { | |
2995 | ERR("Kernel metadata flush failed"); | |
2996 | } | |
f34daff7 | 2997 | |
54d01ffb DG |
2998 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2999 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3000 | if (ret < 0) { |
54d01ffb | 3001 | ERR("Kernel flush buffer error"); |
7d29a247 | 3002 | } |
54d01ffb | 3003 | } |
19e70852 | 3004 | |
54d01ffb DG |
3005 | ret = kernel_stop_session(ksession); |
3006 | if (ret < 0) { | |
3007 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3008 | goto error; |
f3ed775e | 3009 | } |
54d01ffb DG |
3010 | |
3011 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3012 | } |
54d01ffb | 3013 | |
8be98f9a MD |
3014 | if (usess) { |
3015 | usess->start_trace = 0; | |
2bdd86d4 | 3016 | |
8be98f9a | 3017 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3018 | if (ret < 0) { |
8be98f9a | 3019 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
3020 | goto error; |
3021 | } | |
2bdd86d4 | 3022 | } |
54d01ffb DG |
3023 | |
3024 | ret = LTTCOMM_OK; | |
3025 | ||
3026 | error: | |
3027 | return ret; | |
3028 | } | |
3029 | ||
3030 | /* | |
3031 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3032 | */ | |
6df2e2c9 | 3033 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
3034 | { |
3035 | int ret; | |
3036 | ||
6df2e2c9 | 3037 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
3038 | if (ret != LTTCOMM_OK) { |
3039 | goto error; | |
3040 | } | |
3041 | ||
3042 | ret = LTTCOMM_OK; | |
3043 | ||
3044 | error: | |
3045 | return ret; | |
3046 | } | |
3047 | ||
3048 | /* | |
3049 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3050 | */ | |
3051 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3052 | { | |
3053 | int ret; | |
3054 | ||
3055 | /* Clean kernel session teardown */ | |
3056 | teardown_kernel_session(session); | |
84cd17c6 MD |
3057 | /* UST session teardown */ |
3058 | teardown_ust_session(session); | |
54d01ffb DG |
3059 | |
3060 | /* | |
3061 | * Must notify the kernel thread here to update it's poll setin order | |
3062 | * to remove the channel(s)' fd just destroyed. | |
3063 | */ | |
3064 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3065 | if (ret < 0) { | |
3066 | perror("write kernel poll pipe"); | |
3067 | } | |
3068 | ||
271933a4 | 3069 | ret = session_destroy(session); |
54d01ffb DG |
3070 | |
3071 | return ret; | |
3072 | } | |
3073 | ||
3074 | /* | |
3075 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3076 | */ | |
3077 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3078 | { | |
3079 | int ret; | |
3080 | ||
3081 | switch (domain) { | |
3082 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3083 | { |
54d01ffb | 3084 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3085 | |
54d01ffb DG |
3086 | kcalibrate.type = calibrate->type; |
3087 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3088 | if (ret < 0) { |
54d01ffb DG |
3089 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3090 | goto error; | |
33a2b854 | 3091 | } |
54d01ffb DG |
3092 | break; |
3093 | } | |
3094 | default: | |
3095 | /* TODO: Userspace tracing */ | |
3096 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3097 | goto error; | |
3098 | } | |
33a2b854 | 3099 | |
54d01ffb | 3100 | ret = LTTCOMM_OK; |
33a2b854 | 3101 | |
54d01ffb DG |
3102 | error: |
3103 | return ret; | |
3104 | } | |
7d29a247 | 3105 | |
54d01ffb DG |
3106 | /* |
3107 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3108 | */ | |
3109 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3110 | char *sock_path) | |
3111 | { | |
3112 | int ret, sock; | |
b389abbe | 3113 | |
54d01ffb DG |
3114 | switch (domain) { |
3115 | case LTTNG_DOMAIN_KERNEL: | |
3116 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3117 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3118 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3119 | goto error; | |
3120 | } | |
3121 | ||
3122 | sock = lttcomm_connect_unix_sock(sock_path); | |
3123 | if (sock < 0) { | |
3124 | ret = LTTCOMM_CONNECT_FAIL; | |
3125 | goto error; | |
3126 | } | |
3127 | ||
3128 | session->kernel_session->consumer_fd = sock; | |
3129 | break; | |
3130 | default: | |
3131 | /* TODO: Userspace tracing */ | |
3132 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3133 | goto error; | |
3134 | } | |
3135 | ||
3136 | ret = LTTCOMM_OK; | |
3137 | ||
3138 | error: | |
3139 | return ret; | |
3140 | } | |
3141 | ||
3142 | /* | |
3143 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3144 | */ | |
3145 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3146 | struct lttng_domain **domains) | |
3147 | { | |
b551a063 | 3148 | int ret, index = 0; |
54d01ffb DG |
3149 | ssize_t nb_dom = 0; |
3150 | ||
3151 | if (session->kernel_session != NULL) { | |
b551a063 | 3152 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3153 | nb_dom++; |
3154 | } | |
3155 | ||
b551a063 DG |
3156 | if (session->ust_session != NULL) { |
3157 | DBG3("Listing domains found UST global domain"); | |
3158 | nb_dom++; | |
3159 | } | |
54d01ffb | 3160 | |
b551a063 | 3161 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3162 | if (*domains == NULL) { |
3163 | ret = -LTTCOMM_FATAL; | |
3164 | goto error; | |
3165 | } | |
3166 | ||
b551a063 DG |
3167 | if (session->kernel_session != NULL) { |
3168 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3169 | index++; | |
3170 | } | |
3171 | ||
3172 | if (session->ust_session != NULL) { | |
3173 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3174 | index++; | |
3175 | } | |
54d01ffb | 3176 | |
54d01ffb DG |
3177 | return nb_dom; |
3178 | ||
3179 | error: | |
3180 | return ret; | |
3181 | } | |
3182 | ||
3183 | /* | |
3184 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3185 | */ | |
b551a063 | 3186 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3187 | struct lttng_channel **channels) |
3188 | { | |
3189 | int ret; | |
3190 | ssize_t nb_chan = 0; | |
3191 | ||
b551a063 DG |
3192 | switch (domain) { |
3193 | case LTTNG_DOMAIN_KERNEL: | |
3194 | if (session->kernel_session != NULL) { | |
3195 | nb_chan = session->kernel_session->channel_count; | |
3196 | } | |
0df502fd | 3197 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3198 | break; |
3199 | case LTTNG_DOMAIN_UST: | |
3200 | if (session->ust_session != NULL) { | |
bec39940 | 3201 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3202 | session->ust_session->domain_global.channels); |
3203 | } | |
0df502fd | 3204 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3205 | break; |
3206 | default: | |
3207 | *channels = NULL; | |
3208 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3209 | goto error; |
3210 | } | |
3211 | ||
b551a063 DG |
3212 | if (nb_chan > 0) { |
3213 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3214 | if (*channels == NULL) { | |
3215 | ret = -LTTCOMM_FATAL; | |
3216 | goto error; | |
3217 | } | |
54d01ffb | 3218 | |
b551a063 DG |
3219 | list_lttng_channels(domain, session, *channels); |
3220 | } else { | |
3221 | *channels = NULL; | |
3222 | } | |
2bdd86d4 | 3223 | |
54d01ffb DG |
3224 | return nb_chan; |
3225 | ||
3226 | error: | |
3227 | return ret; | |
3228 | } | |
3229 | ||
3230 | /* | |
3231 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3232 | */ | |
b551a063 | 3233 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3234 | char *channel_name, struct lttng_event **events) |
3235 | { | |
b551a063 | 3236 | int ret = 0; |
54d01ffb | 3237 | ssize_t nb_event = 0; |
54d01ffb | 3238 | |
b551a063 DG |
3239 | switch (domain) { |
3240 | case LTTNG_DOMAIN_KERNEL: | |
3241 | if (session->kernel_session != NULL) { | |
3242 | nb_event = list_lttng_kernel_events(channel_name, | |
3243 | session->kernel_session, events); | |
54d01ffb | 3244 | } |
b551a063 DG |
3245 | break; |
3246 | case LTTNG_DOMAIN_UST: | |
3247 | { | |
3248 | if (session->ust_session != NULL) { | |
3249 | nb_event = list_lttng_ust_global_events(channel_name, | |
3250 | &session->ust_session->domain_global, events); | |
54d01ffb | 3251 | } |
b551a063 | 3252 | break; |
54d01ffb | 3253 | } |
b551a063 DG |
3254 | default: |
3255 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3256 | goto error; |
3257 | } | |
3258 | ||
b551a063 | 3259 | ret = nb_event; |
54d01ffb DG |
3260 | |
3261 | error: | |
3262 | return ret; | |
3263 | } | |
3264 | ||
3265 | /* | |
3266 | * Process the command requested by the lttng client within the command | |
3267 | * context structure. This function make sure that the return structure (llm) | |
3268 | * is set and ready for transmission before returning. | |
3269 | * | |
3270 | * Return any error encountered or 0 for success. | |
3271 | */ | |
3272 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3273 | { | |
3274 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3275 | int need_tracing_session = 1; |
54d01ffb DG |
3276 | |
3277 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3278 | ||
4fba7219 DG |
3279 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3280 | ret = LTTCOMM_KERN_NA; | |
3281 | goto error; | |
3282 | } | |
3283 | ||
54d01ffb DG |
3284 | /* |
3285 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3286 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3287 | * command. |
3288 | */ | |
3289 | switch(cmd_ctx->lsm->cmd_type) { | |
3290 | case LTTNG_LIST_SESSIONS: | |
3291 | case LTTNG_LIST_TRACEPOINTS: | |
3292 | case LTTNG_LIST_DOMAINS: | |
3293 | case LTTNG_LIST_CHANNELS: | |
3294 | case LTTNG_LIST_EVENTS: | |
3295 | break; | |
3296 | default: | |
3297 | /* Setup lttng message with no payload */ | |
3298 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3299 | if (ret < 0) { | |
3300 | /* This label does not try to unlock the session */ | |
3301 | goto init_setup_error; | |
3302 | } | |
3303 | } | |
3304 | ||
3305 | /* Commands that DO NOT need a session. */ | |
3306 | switch (cmd_ctx->lsm->cmd_type) { | |
3307 | case LTTNG_CALIBRATE: | |
3308 | case LTTNG_CREATE_SESSION: | |
3309 | case LTTNG_LIST_SESSIONS: | |
3310 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3311 | need_tracing_session = 0; |
54d01ffb DG |
3312 | break; |
3313 | default: | |
3314 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3315 | session_lock_list(); |
54d01ffb | 3316 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3317 | session_unlock_list(); |
54d01ffb DG |
3318 | if (cmd_ctx->session == NULL) { |
3319 | if (cmd_ctx->lsm->session.name != NULL) { | |
3320 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3321 | } else { | |
3322 | /* If no session name specified */ | |
3323 | ret = LTTCOMM_SELECT_SESS; | |
3324 | } | |
3325 | goto error; | |
3326 | } else { | |
3327 | /* Acquire lock for the session */ | |
3328 | session_lock(cmd_ctx->session); | |
3329 | } | |
3330 | break; | |
3331 | } | |
b389abbe | 3332 | |
54d01ffb DG |
3333 | /* |
3334 | * Check domain type for specific "pre-action". | |
3335 | */ | |
3336 | switch (cmd_ctx->lsm->domain.type) { | |
3337 | case LTTNG_DOMAIN_KERNEL: | |
3338 | /* Kernel tracer check */ | |
3339 | if (kernel_tracer_fd == 0) { | |
3340 | /* Basically, load kernel tracer modules */ | |
3341 | init_kernel_tracer(); | |
3342 | if (kernel_tracer_fd == 0) { | |
3343 | ret = LTTCOMM_KERN_NA; | |
3344 | goto error; | |
3345 | } | |
3346 | } | |
5eb91c98 | 3347 | |
54d01ffb | 3348 | /* Need a session for kernel command */ |
44d3bd01 | 3349 | if (need_tracing_session) { |
54d01ffb DG |
3350 | if (cmd_ctx->session->kernel_session == NULL) { |
3351 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3352 | if (ret < 0) { |
54d01ffb | 3353 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3354 | goto error; |
3355 | } | |
b389abbe | 3356 | } |
7d29a247 | 3357 | |
54d01ffb | 3358 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3359 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3360 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3361 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3362 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3363 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3364 | if (ret < 0) { |
54d01ffb DG |
3365 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3366 | goto error; | |
950131af | 3367 | } |
3ff2ecac MD |
3368 | } else { |
3369 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3370 | } |
0d0c377a | 3371 | } |
54d01ffb | 3372 | break; |
2bdd86d4 | 3373 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3374 | { |
44d3bd01 | 3375 | if (need_tracing_session) { |
f6a9efaa | 3376 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3377 | ret = create_ust_session(cmd_ctx->session, |
3378 | &cmd_ctx->lsm->domain); | |
3379 | if (ret != LTTCOMM_OK) { | |
3380 | goto error; | |
3381 | } | |
3382 | } | |
7753dea8 MD |
3383 | /* Start the UST consumer daemons */ |
3384 | /* 64-bit */ | |
3385 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3386 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3387 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3388 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3389 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3390 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3391 | if (ret < 0) { |
7753dea8 MD |
3392 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3393 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3394 | goto error; |
3395 | } | |
48842b30 | 3396 | |
7753dea8 | 3397 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3398 | } else { |
7753dea8 MD |
3399 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3400 | } | |
3401 | /* 32-bit */ | |
fc7a59ce | 3402 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3403 | ustconsumer32_data.pid == 0 && |
3404 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3405 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3406 | ret = start_consumerd(&ustconsumer32_data); | |
3407 | if (ret < 0) { | |
3408 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3409 | ust_consumerd32_fd = -EINVAL; | |
3410 | goto error; | |
3411 | } | |
3412 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3413 | } else { | |
3414 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3415 | } |
44d3bd01 DG |
3416 | } |
3417 | break; | |
3418 | } | |
54d01ffb | 3419 | default: |
54d01ffb DG |
3420 | break; |
3421 | } | |
33a2b854 | 3422 | |
8e0af1b4 MD |
3423 | /* |
3424 | * Check that the UID or GID match that of the tracing session. | |
3425 | * The root user can interact with all sessions. | |
3426 | */ | |
3427 | if (need_tracing_session) { | |
3428 | if (!session_access_ok(cmd_ctx->session, | |
3429 | cmd_ctx->creds.uid, cmd_ctx->creds.gid)) { | |
3430 | ret = LTTCOMM_EPERM; | |
3431 | goto error; | |
3432 | } | |
3433 | } | |
3434 | ||
54d01ffb DG |
3435 | /* Process by command type */ |
3436 | switch (cmd_ctx->lsm->cmd_type) { | |
3437 | case LTTNG_ADD_CONTEXT: | |
3438 | { | |
3439 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3440 | cmd_ctx->lsm->u.context.channel_name, | |
3441 | cmd_ctx->lsm->u.context.event_name, | |
3442 | &cmd_ctx->lsm->u.context.ctx); | |
3443 | break; | |
3444 | } | |
3445 | case LTTNG_DISABLE_CHANNEL: | |
3446 | { | |
3447 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3448 | cmd_ctx->lsm->u.disable.channel_name); | |
3449 | break; | |
3450 | } | |
3451 | case LTTNG_DISABLE_EVENT: | |
3452 | { | |
3453 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3454 | cmd_ctx->lsm->u.disable.channel_name, | |
3455 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3456 | ret = LTTCOMM_OK; |
3457 | break; | |
3458 | } | |
54d01ffb DG |
3459 | case LTTNG_DISABLE_ALL_EVENT: |
3460 | { | |
2bdd86d4 | 3461 | DBG("Disabling all events"); |
54d01ffb DG |
3462 | |
3463 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3464 | cmd_ctx->lsm->u.disable.channel_name); | |
3465 | break; | |
3466 | } | |
3467 | case LTTNG_ENABLE_CHANNEL: | |
3468 | { | |
aea829b3 | 3469 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3470 | &cmd_ctx->lsm->u.channel.chan); |
3471 | break; | |
3472 | } | |
3473 | case LTTNG_ENABLE_EVENT: | |
3474 | { | |
3475 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3476 | cmd_ctx->lsm->u.enable.channel_name, | |
3477 | &cmd_ctx->lsm->u.enable.event); | |
3478 | break; | |
3479 | } | |
3480 | case LTTNG_ENABLE_ALL_EVENT: | |
3481 | { | |
2bdd86d4 | 3482 | DBG("Enabling all events"); |
54d01ffb DG |
3483 | |
3484 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3485 | cmd_ctx->lsm->u.enable.channel_name, |
3486 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3487 | break; |
3488 | } | |
052da939 | 3489 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3490 | { |
9f19cc17 | 3491 | struct lttng_event *events; |
54d01ffb | 3492 | ssize_t nb_events; |
052da939 | 3493 | |
54d01ffb DG |
3494 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3495 | if (nb_events < 0) { | |
3496 | ret = -nb_events; | |
3497 | goto error; | |
2ef84c95 DG |
3498 | } |
3499 | ||
3500 | /* | |
3501 | * Setup lttng message with payload size set to the event list size in | |
3502 | * bytes and then copy list into the llm payload. | |
3503 | */ | |
052da939 | 3504 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3505 | if (ret < 0) { |
052da939 | 3506 | free(events); |
2ef84c95 DG |
3507 | goto setup_error; |
3508 | } | |
3509 | ||
3510 | /* Copy event list into message payload */ | |
9f19cc17 | 3511 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3512 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3513 | |
9f19cc17 | 3514 | free(events); |
2ef84c95 DG |
3515 | |
3516 | ret = LTTCOMM_OK; | |
3517 | break; | |
3518 | } | |
f3ed775e | 3519 | case LTTNG_START_TRACE: |
8c0faa1d | 3520 | { |
54d01ffb | 3521 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3522 | break; |
3523 | } | |
f3ed775e | 3524 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3525 | { |
54d01ffb | 3526 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3527 | break; |
3528 | } | |
5e16da05 MD |
3529 | case LTTNG_CREATE_SESSION: |
3530 | { | |
3c6bae61 | 3531 | tracepoint(create_session_start); |
54d01ffb | 3532 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3533 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
3c6bae61 | 3534 | tracepoint(create_session_end); |
5e16da05 MD |
3535 | break; |
3536 | } | |
3537 | case LTTNG_DESTROY_SESSION: | |
3538 | { | |
3c6bae61 | 3539 | tracepoint(destroy_session_start); |
54d01ffb DG |
3540 | ret = cmd_destroy_session(cmd_ctx->session, |
3541 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 3542 | tracepoint(destroy_session_end); |
5461b305 | 3543 | break; |
5e16da05 | 3544 | } |
9f19cc17 | 3545 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3546 | { |
54d01ffb DG |
3547 | ssize_t nb_dom; |
3548 | struct lttng_domain *domains; | |
5461b305 | 3549 | |
54d01ffb DG |
3550 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3551 | if (nb_dom < 0) { | |
3552 | ret = -nb_dom; | |
3553 | goto error; | |
ce3d728c | 3554 | } |
520ff687 | 3555 | |
54d01ffb | 3556 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3557 | if (ret < 0) { |
3558 | goto setup_error; | |
520ff687 | 3559 | } |
57167058 | 3560 | |
54d01ffb DG |
3561 | /* Copy event list into message payload */ |
3562 | memcpy(cmd_ctx->llm->payload, domains, | |
3563 | nb_dom * sizeof(struct lttng_domain)); | |
3564 | ||
3565 | free(domains); | |
5e16da05 | 3566 | |
5461b305 | 3567 | ret = LTTCOMM_OK; |
5e16da05 MD |
3568 | break; |
3569 | } | |
9f19cc17 | 3570 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3571 | { |
54d01ffb DG |
3572 | size_t nb_chan; |
3573 | struct lttng_channel *channels; | |
3574 | ||
b551a063 DG |
3575 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3576 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3577 | if (nb_chan < 0) { |
3578 | ret = -nb_chan; | |
3579 | goto error; | |
5461b305 | 3580 | } |
ca95a216 | 3581 | |
54d01ffb | 3582 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3583 | if (ret < 0) { |
3584 | goto setup_error; | |
3585 | } | |
9f19cc17 | 3586 | |
54d01ffb DG |
3587 | /* Copy event list into message payload */ |
3588 | memcpy(cmd_ctx->llm->payload, channels, | |
3589 | nb_chan * sizeof(struct lttng_channel)); | |
3590 | ||
3591 | free(channels); | |
9f19cc17 DG |
3592 | |
3593 | ret = LTTCOMM_OK; | |
5461b305 | 3594 | break; |
5e16da05 | 3595 | } |
9f19cc17 | 3596 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3597 | { |
b551a063 | 3598 | ssize_t nb_event; |
684d34d2 | 3599 | struct lttng_event *events = NULL; |
9f19cc17 | 3600 | |
b551a063 | 3601 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3602 | cmd_ctx->lsm->u.list.channel_name, &events); |
3603 | if (nb_event < 0) { | |
3604 | ret = -nb_event; | |
3605 | goto error; | |
5461b305 | 3606 | } |
ca95a216 | 3607 | |
54d01ffb | 3608 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3609 | if (ret < 0) { |
3610 | goto setup_error; | |
3611 | } | |
9f19cc17 | 3612 | |
54d01ffb DG |
3613 | /* Copy event list into message payload */ |
3614 | memcpy(cmd_ctx->llm->payload, events, | |
3615 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3616 | |
54d01ffb | 3617 | free(events); |
9f19cc17 DG |
3618 | |
3619 | ret = LTTCOMM_OK; | |
5461b305 | 3620 | break; |
5e16da05 MD |
3621 | } |
3622 | case LTTNG_LIST_SESSIONS: | |
3623 | { | |
8e0af1b4 | 3624 | unsigned int nr_sessions; |
5461b305 | 3625 | |
8e0af1b4 MD |
3626 | session_lock_list(); |
3627 | nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
3628 | if (nr_sessions == 0) { | |
f3ed775e | 3629 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3630 | session_unlock_list(); |
5461b305 | 3631 | goto error; |
57167058 | 3632 | } |
8e0af1b4 | 3633 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3634 | if (ret < 0) { |
54d01ffb | 3635 | session_unlock_list(); |
5461b305 | 3636 | goto setup_error; |
e065084a | 3637 | } |
5e16da05 | 3638 | |
6c9cc2ab | 3639 | /* Filled the session array */ |
8e0af1b4 MD |
3640 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
3641 | cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
6c9cc2ab | 3642 | |
54d01ffb | 3643 | session_unlock_list(); |
5e16da05 | 3644 | |
5461b305 | 3645 | ret = LTTCOMM_OK; |
5e16da05 MD |
3646 | break; |
3647 | } | |
d0254c7c MD |
3648 | case LTTNG_CALIBRATE: |
3649 | { | |
54d01ffb DG |
3650 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3651 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3652 | break; |
3653 | } | |
d9800920 DG |
3654 | case LTTNG_REGISTER_CONSUMER: |
3655 | { | |
54d01ffb DG |
3656 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3657 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3658 | break; |
3659 | } | |
5e16da05 | 3660 | default: |
5e16da05 | 3661 | ret = LTTCOMM_UND; |
5461b305 | 3662 | break; |
fac6795d DG |
3663 | } |
3664 | ||
5461b305 | 3665 | error: |
5461b305 DG |
3666 | if (cmd_ctx->llm == NULL) { |
3667 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3668 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3669 | goto setup_error; |
3670 | } | |
3671 | } | |
54d01ffb | 3672 | /* Set return code */ |
5461b305 | 3673 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3674 | setup_error: |
b5541356 | 3675 | if (cmd_ctx->session) { |
54d01ffb | 3676 | session_unlock(cmd_ctx->session); |
b5541356 | 3677 | } |
54d01ffb | 3678 | init_setup_error: |
8028d920 | 3679 | return ret; |
fac6795d DG |
3680 | } |
3681 | ||
1d4b027a | 3682 | /* |
d063d709 DG |
3683 | * This thread manage all clients request using the unix client socket for |
3684 | * communication. | |
1d4b027a DG |
3685 | */ |
3686 | static void *thread_manage_clients(void *data) | |
3687 | { | |
5eb91c98 DG |
3688 | int sock = 0, ret, i, pollfd; |
3689 | uint32_t revents, nb_fd; | |
273ea72c | 3690 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3691 | struct lttng_poll_event events; |
1d4b027a | 3692 | |
b25a8868 DG |
3693 | tracepoint(sessiond_th_cli_start); |
3694 | ||
1d4b027a DG |
3695 | DBG("[thread] Manage client started"); |
3696 | ||
f6a9efaa DG |
3697 | rcu_register_thread(); |
3698 | ||
1d4b027a DG |
3699 | ret = lttcomm_listen_unix_sock(client_sock); |
3700 | if (ret < 0) { | |
3701 | goto error; | |
3702 | } | |
3703 | ||
5eb91c98 DG |
3704 | /* |
3705 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3706 | * more will be added to this poll set. | |
3707 | */ | |
3708 | ret = create_thread_poll_set(&events, 2); | |
3709 | if (ret < 0) { | |
3710 | goto error; | |
3711 | } | |
273ea72c | 3712 | |
5eb91c98 DG |
3713 | /* Add the application registration socket */ |
3714 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3715 | if (ret < 0) { | |
3716 | goto error; | |
3717 | } | |
273ea72c | 3718 | |
bbd973c2 DG |
3719 | /* |
3720 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3721 | */ |
3722 | if (opt_sig_parent) { | |
3723 | kill(ppid, SIGCHLD); | |
3724 | } | |
3725 | ||
3726 | while (1) { | |
1d4b027a | 3727 | DBG("Accepting client command ..."); |
273ea72c | 3728 | |
b25a8868 DG |
3729 | tracepoint(sessiond_th_cli_poll); |
3730 | ||
5eb91c98 DG |
3731 | nb_fd = LTTNG_POLL_GETNB(&events); |
3732 | ||
273ea72c | 3733 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3734 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3735 | if (ret < 0) { |
273ea72c DG |
3736 | goto error; |
3737 | } | |
3738 | ||
5eb91c98 DG |
3739 | for (i = 0; i < nb_fd; i++) { |
3740 | /* Fetch once the poll data */ | |
3741 | revents = LTTNG_POLL_GETEV(&events, i); | |
3742 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3743 | ||
3744 | /* Thread quit pipe has been closed. Killing thread. */ | |
3745 | ret = check_thread_quit_pipe(pollfd, revents); | |
3746 | if (ret) { | |
3747 | goto error; | |
3748 | } | |
3749 | ||
3750 | /* Event on the registration socket */ | |
3751 | if (pollfd == client_sock) { | |
3752 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3753 | ERR("Client socket poll error"); | |
3754 | goto error; | |
3755 | } | |
3756 | } | |
273ea72c DG |
3757 | } |
3758 | ||
5eb91c98 DG |
3759 | DBG("Wait for client response"); |
3760 | ||
1d4b027a DG |
3761 | sock = lttcomm_accept_unix_sock(client_sock); |
3762 | if (sock < 0) { | |
3763 | goto error; | |
3764 | } | |
3765 | ||
be040666 DG |
3766 | /* Set socket option for credentials retrieval */ |
3767 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3768 | if (ret < 0) { | |
3769 | goto error; | |
3770 | } | |
3771 | ||
1d4b027a | 3772 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3773 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3774 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3775 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3776 | goto error; |
5eb91c98 | 3777 | } |
1d4b027a DG |
3778 | |
3779 | /* Allocate data buffer for reception */ | |
ba7f0ae5 | 3780 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3781 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3782 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3783 | goto error; |
3784 | } | |
1d4b027a | 3785 | |
1d4b027a DG |
3786 | cmd_ctx->llm = NULL; |
3787 | cmd_ctx->session = NULL; | |
3788 | ||
3789 | /* | |
3790 | * Data is received from the lttng client. The struct | |
3791 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3792 | * the client. | |
3793 | */ | |
3794 | DBG("Receiving data from client ..."); | |
be040666 DG |
3795 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3796 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
1d4b027a | 3797 | if (ret <= 0) { |
5eb91c98 DG |
3798 | DBG("Nothing recv() from client... continuing"); |
3799 | close(sock); | |
3800 | free(cmd_ctx); | |
1d4b027a DG |
3801 | continue; |
3802 | } | |
3803 | ||
5eb91c98 DG |
3804 | // TODO: Validate cmd_ctx including sanity check for |
3805 | // security purpose. | |
f7776ea7 | 3806 | |
f6a9efaa | 3807 | rcu_thread_online(); |
1d4b027a DG |
3808 | /* |
3809 | * This function dispatch the work to the kernel or userspace tracer | |
3810 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3811 | * informations for the client. The command context struct contains | |
3812 | * everything this function may needs. | |
3813 | */ | |
3814 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3815 | rcu_thread_offline(); |
1d4b027a | 3816 | if (ret < 0) { |
bbd973c2 | 3817 | /* |
5eb91c98 | 3818 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3819 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3820 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3821 | */ |
a2fb29a5 | 3822 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3823 | continue; |
3824 | } | |
3825 | ||
54d01ffb DG |
3826 | DBG("Sending response (size: %d, retcode: %s)", |
3827 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3828 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3829 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
3830 | if (ret < 0) { |
3831 | ERR("Failed to send data back to client"); | |
3832 | } | |
3833 | ||
d6e4fca4 DG |
3834 | /* End of transmission */ |
3835 | close(sock); | |
be040666 DG |
3836 | |
3837 | clean_command_ctx(&cmd_ctx); | |
1d4b027a DG |
3838 | } |
3839 | ||
3840 | error: | |
273ea72c | 3841 | DBG("Client thread dying"); |
273ea72c | 3842 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3843 | close(client_sock); |
3844 | close(sock); | |
273ea72c | 3845 | |
5eb91c98 | 3846 | lttng_poll_clean(&events); |
a2fb29a5 | 3847 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3848 | |
3849 | rcu_unregister_thread(); | |
1d4b027a DG |
3850 | return NULL; |
3851 | } | |
3852 | ||
3853 | ||
fac6795d DG |
3854 | /* |
3855 | * usage function on stderr | |
3856 | */ | |
3857 | static void usage(void) | |
3858 | { | |
b716ce68 | 3859 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3860 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3861 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3862 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3863 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3864 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3865 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3866 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3867 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3868 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3869 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3870 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3871 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3872 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3873 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3874 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3875 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3876 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3877 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3878 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3879 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3880 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3881 | } |
3882 | ||
3883 | /* | |
3884 | * daemon argument parsing | |
3885 | */ | |
3886 | static int parse_args(int argc, char **argv) | |
3887 | { | |
3888 | int c; | |
3889 | ||
3890 | static struct option long_options[] = { | |
3891 | { "client-sock", 1, 0, 'c' }, | |
3892 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3893 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3894 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3895 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3896 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3897 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3898 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3899 | { "consumerd32-path", 1, 0, 'u' }, | |
3900 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3901 | { "consumerd64-path", 1, 0, 't' }, | |
3902 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3903 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3904 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3905 | { "help", 0, 0, 'h' }, |
3906 | { "group", 1, 0, 'g' }, | |
3907 | { "version", 0, 0, 'V' }, | |
75462a81 | 3908 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3909 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3910 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3911 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3912 | { NULL, 0, 0, 0 } |
3913 | }; | |
3914 | ||
3915 | while (1) { | |
3916 | int option_index = 0; | |
4fba7219 | 3917 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3918 | long_options, &option_index); |
fac6795d DG |
3919 | if (c == -1) { |
3920 | break; | |
3921 | } | |
3922 | ||
3923 | switch (c) { | |
3924 | case 0: | |
3925 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3926 | if (optarg) { | |
3927 | fprintf(stderr, " with arg %s\n", optarg); | |
3928 | } | |
3929 | break; | |
b716ce68 | 3930 | case 'c': |
fac6795d DG |
3931 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3932 | break; | |
3933 | case 'a': | |
3934 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3935 | break; | |
3936 | case 'd': | |
3937 | opt_daemon = 1; | |
3938 | break; | |
3939 | case 'g': | |
fb09408a | 3940 | opt_tracing_group = optarg; |
fac6795d DG |
3941 | break; |
3942 | case 'h': | |
3943 | usage(); | |
3944 | exit(EXIT_FAILURE); | |
3945 | case 'V': | |
3946 | fprintf(stdout, "%s\n", VERSION); | |
3947 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3948 | case 'S': |
3949 | opt_sig_parent = 1; | |
3950 | break; | |
d6f42150 | 3951 | case 'E': |
3bd1e081 | 3952 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3953 | break; |
3954 | case 'C': | |
3bd1e081 MD |
3955 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3956 | break; | |
3957 | case 'F': | |
7753dea8 | 3958 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3959 | break; |
3960 | case 'D': | |
7753dea8 MD |
3961 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3962 | break; | |
3963 | case 'H': | |
3964 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3965 | break; | |
3966 | case 'G': | |
3967 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3968 | break; |
4fba7219 DG |
3969 | case 'N': |
3970 | opt_no_kernel = 1; | |
3971 | break; | |
75462a81 DG |
3972 | case 'q': |
3973 | opt_quiet = 1; | |
3974 | break; | |
3f9947db | 3975 | case 'v': |
53086306 DG |
3976 | /* Verbose level can increase using multiple -v */ |
3977 | opt_verbose += 1; | |
3f9947db | 3978 | break; |
31f73cc9 | 3979 | case 'Z': |
3bd1e081 | 3980 | opt_verbose_consumer += 1; |
31f73cc9 | 3981 | break; |
fb09408a | 3982 | case 'u': |
fc7a59ce | 3983 | consumerd32_bin= optarg; |
ebaeda94 MD |
3984 | break; |
3985 | case 'U': | |
3986 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3987 | break; |
3988 | case 't': | |
fc7a59ce | 3989 | consumerd64_bin = optarg; |
ebaeda94 MD |
3990 | break; |
3991 | case 'T': | |
3992 | consumerd64_libdir = optarg; | |
fb09408a | 3993 | break; |
fac6795d DG |
3994 | default: |
3995 | /* Unknown option or other error. | |
3996 | * Error is printed by getopt, just return */ | |
3997 | return -1; | |
3998 | } | |
3999 | } | |
4000 | ||
4001 | return 0; | |
4002 | } | |
4003 | ||
4004 | /* | |
d063d709 | 4005 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4006 | * apps_sock - The communication socket for all UST apps. |
4007 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4008 | */ |
cf3af59e | 4009 | static int init_daemon_socket(void) |
fac6795d DG |
4010 | { |
4011 | int ret = 0; | |
4012 | mode_t old_umask; | |
4013 | ||
4014 | old_umask = umask(0); | |
4015 | ||
4016 | /* Create client tool unix socket */ | |
d6f42150 DG |
4017 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4018 | if (client_sock < 0) { | |
4019 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4020 | ret = -1; |
4021 | goto end; | |
4022 | } | |
4023 | ||
4024 | /* File permission MUST be 660 */ | |
4025 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4026 | if (ret < 0) { | |
d6f42150 | 4027 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
4028 | perror("chmod"); |
4029 | goto end; | |
4030 | } | |
4031 | ||
4032 | /* Create the application unix socket */ | |
d6f42150 DG |
4033 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4034 | if (apps_sock < 0) { | |
4035 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4036 | ret = -1; |
4037 | goto end; | |
4038 | } | |
4039 | ||
d6f42150 | 4040 | /* File permission MUST be 666 */ |
54d01ffb DG |
4041 | ret = chmod(apps_unix_sock_path, |
4042 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4043 | if (ret < 0) { |
d6f42150 | 4044 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
4045 | perror("chmod"); |
4046 | goto end; | |
4047 | } | |
4048 | ||
4049 | end: | |
4050 | umask(old_umask); | |
4051 | return ret; | |
4052 | } | |
4053 | ||
4054 | /* | |
54d01ffb DG |
4055 | * Check if the global socket is available, and if a daemon is answering at the |
4056 | * other side. If yes, error is returned. | |
fac6795d | 4057 | */ |
cf3af59e | 4058 | static int check_existing_daemon(void) |
fac6795d | 4059 | { |
7d8234d9 | 4060 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 4061 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 4062 | return 0; |
099e26bd | 4063 | } |
54d01ffb | 4064 | |
7d8234d9 | 4065 | /* Is there anybody out there ? */ |
099e26bd | 4066 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4067 | return -EEXIST; |
099e26bd | 4068 | } else { |
7d8234d9 | 4069 | return 0; |
099e26bd | 4070 | } |
fac6795d DG |
4071 | } |
4072 | ||
fac6795d | 4073 | /* |
d063d709 | 4074 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4075 | * |
d063d709 DG |
4076 | * Race window between mkdir and chown is OK because we are going from more |
4077 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4078 | */ |
be040666 | 4079 | static int set_permissions(char *rundir) |
fac6795d DG |
4080 | { |
4081 | int ret; | |
996b65c8 | 4082 | gid_t gid; |
fac6795d | 4083 | |
996b65c8 MD |
4084 | gid = allowed_group(); |
4085 | if (gid < 0) { | |
be040666 DG |
4086 | WARN("No tracing group detected"); |
4087 | ret = 0; | |
fac6795d DG |
4088 | goto end; |
4089 | } | |
4090 | ||
d6f42150 | 4091 | /* Set lttng run dir */ |
be040666 | 4092 | ret = chown(rundir, 0, gid); |
d6f42150 | 4093 | if (ret < 0) { |
be040666 | 4094 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4095 | perror("chown"); |
4096 | } | |
4097 | ||
4098 | /* lttng client socket path */ | |
996b65c8 | 4099 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4100 | if (ret < 0) { |
d6f42150 DG |
4101 | ERR("Unable to set group on %s", client_unix_sock_path); |
4102 | perror("chown"); | |
4103 | } | |
4104 | ||
3bd1e081 MD |
4105 | /* kconsumer error socket path */ |
4106 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4107 | if (ret < 0) { |
3bd1e081 MD |
4108 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4109 | perror("chown"); | |
4110 | } | |
4111 | ||
7753dea8 MD |
4112 | /* 64-bit ustconsumer error socket path */ |
4113 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4114 | if (ret < 0) { | |
4115 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4116 | perror("chown"); | |
4117 | } | |
4118 | ||
4119 | /* 32-bit ustconsumer compat32 error socket path */ | |
4120 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4121 | if (ret < 0) { |
7753dea8 | 4122 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4123 | perror("chown"); |
4124 | } | |
4125 | ||
d6f42150 | 4126 | DBG("All permissions are set"); |
e07ae692 | 4127 | |
fac6795d DG |
4128 | end: |
4129 | return ret; | |
4130 | } | |
4131 | ||
7a485870 | 4132 | /* |
d063d709 | 4133 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4134 | */ |
4135 | static int create_kernel_poll_pipe(void) | |
4136 | { | |
4137 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4138 | } | |
4139 | ||
099e26bd DG |
4140 | /* |
4141 | * Create the application command pipe to wake thread_manage_apps. | |
4142 | */ | |
4143 | static int create_apps_cmd_pipe(void) | |
4144 | { | |
4145 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4146 | } | |
4147 | ||
d6f42150 | 4148 | /* |
d063d709 | 4149 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4150 | */ |
67e40797 | 4151 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4152 | { |
4153 | int ret; | |
4154 | ||
67e40797 DG |
4155 | DBG3("Creating LTTng run directory: %s", rundir); |
4156 | ||
4157 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4158 | if (ret < 0) { |
b1f11e69 | 4159 | if (errno != EEXIST) { |
67e40797 | 4160 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4161 | goto error; |
4162 | } else { | |
4163 | ret = 0; | |
4164 | } | |
d6f42150 DG |
4165 | } |
4166 | ||
4167 | error: | |
4168 | return ret; | |
4169 | } | |
4170 | ||
4171 | /* | |
d063d709 DG |
4172 | * Setup sockets and directory needed by the kconsumerd communication with the |
4173 | * session daemon. | |
d6f42150 | 4174 | */ |
67e40797 DG |
4175 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4176 | const char *rundir) | |
d6f42150 DG |
4177 | { |
4178 | int ret; | |
67e40797 | 4179 | char path[PATH_MAX]; |
d6f42150 | 4180 | |
67e40797 | 4181 | switch (consumer_data->type) { |
7753dea8 | 4182 | case LTTNG_CONSUMER_KERNEL: |
67e40797 | 4183 | snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4184 | break; |
4185 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 4186 | snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4187 | break; |
4188 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 4189 | snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4190 | break; |
4191 | default: | |
4192 | ERR("Consumer type unknown"); | |
4193 | ret = -EINVAL; | |
4194 | goto error; | |
d6f42150 DG |
4195 | } |
4196 | ||
67e40797 DG |
4197 | DBG2("Creating consumer directory: %s", path); |
4198 | ||
3bd1e081 | 4199 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4200 | if (ret < 0) { |
6beb2242 | 4201 | if (errno != EEXIST) { |
3bd1e081 | 4202 | ERR("Failed to create %s", path); |
6beb2242 DG |
4203 | goto error; |
4204 | } | |
4205 | ret = 0; | |
d6f42150 DG |
4206 | } |
4207 | ||
4208 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4209 | consumer_data->err_sock = |
4210 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4211 | if (consumer_data->err_sock < 0) { | |
4212 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4213 | ret = -1; |
4214 | goto error; | |
4215 | } | |
4216 | ||
4217 | /* File permission MUST be 660 */ | |
3bd1e081 | 4218 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4219 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4220 | if (ret < 0) { |
3bd1e081 | 4221 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4222 | PERROR("chmod"); |
d6f42150 DG |
4223 | goto error; |
4224 | } | |
4225 | ||
4226 | error: | |
4227 | return ret; | |
4228 | } | |
4229 | ||
fac6795d | 4230 | /* |
d063d709 | 4231 | * Signal handler for the daemon |
cf3af59e | 4232 | * |
54d01ffb DG |
4233 | * Simply stop all worker threads, leaving main() return gracefully after |
4234 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4235 | */ |
4236 | static void sighandler(int sig) | |
4237 | { | |
4238 | switch (sig) { | |
cf3af59e MD |
4239 | case SIGPIPE: |
4240 | DBG("SIGPIPE catched"); | |
4241 | return; | |
4242 | case SIGINT: | |
4243 | DBG("SIGINT catched"); | |
4244 | stop_threads(); | |
4245 | break; | |
4246 | case SIGTERM: | |
4247 | DBG("SIGTERM catched"); | |
4248 | stop_threads(); | |
4249 | break; | |
4250 | default: | |
4251 | break; | |
fac6795d | 4252 | } |
fac6795d DG |
4253 | } |
4254 | ||
4255 | /* | |
d063d709 | 4256 | * Setup signal handler for : |
1d4b027a | 4257 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4258 | */ |
1d4b027a | 4259 | static int set_signal_handler(void) |
fac6795d | 4260 | { |
1d4b027a DG |
4261 | int ret = 0; |
4262 | struct sigaction sa; | |
4263 | sigset_t sigset; | |
fac6795d | 4264 | |
1d4b027a DG |
4265 | if ((ret = sigemptyset(&sigset)) < 0) { |
4266 | perror("sigemptyset"); | |
4267 | return ret; | |
4268 | } | |
d6f42150 | 4269 | |
1d4b027a DG |
4270 | sa.sa_handler = sighandler; |
4271 | sa.sa_mask = sigset; | |
4272 | sa.sa_flags = 0; | |
4273 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4274 | perror("sigaction"); | |
4275 | return ret; | |
d6f42150 DG |
4276 | } |
4277 | ||
1d4b027a DG |
4278 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4279 | perror("sigaction"); | |
4280 | return ret; | |
d6f42150 | 4281 | } |
aaf26714 | 4282 | |
1d4b027a DG |
4283 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4284 | perror("sigaction"); | |
4285 | return ret; | |
8c0faa1d DG |
4286 | } |
4287 | ||
1d4b027a DG |
4288 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4289 | ||
4290 | return ret; | |
fac6795d DG |
4291 | } |
4292 | ||
f3ed775e | 4293 | /* |
d063d709 DG |
4294 | * Set open files limit to unlimited. This daemon can open a large number of |
4295 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4296 | */ |
4297 | static void set_ulimit(void) | |
4298 | { | |
4299 | int ret; | |
4300 | struct rlimit lim; | |
4301 | ||
a88df331 | 4302 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4303 | lim.rlim_cur = 65535; |
4304 | lim.rlim_max = 65535; | |
4305 | ||
4306 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4307 | if (ret < 0) { | |
4308 | perror("failed to set open files limit"); | |
4309 | } | |
4310 | } | |
4311 | ||
fac6795d DG |
4312 | /* |
4313 | * main | |
4314 | */ | |
4315 | int main(int argc, char **argv) | |
4316 | { | |
fac6795d DG |
4317 | int ret = 0; |
4318 | void *status; | |
b082db07 | 4319 | const char *home_path; |
fac6795d | 4320 | |
b25a8868 | 4321 | tracepoint(sessiond_boot_start); |
f6a9efaa | 4322 | rcu_register_thread(); |
b25a8868 | 4323 | |
273ea72c | 4324 | /* Create thread quit pipe */ |
cf3af59e MD |
4325 | if ((ret = init_thread_quit_pipe()) < 0) { |
4326 | goto error; | |
273ea72c DG |
4327 | } |
4328 | ||
7753dea8 | 4329 | setup_consumerd_path(); |
fb09408a | 4330 | |
fac6795d DG |
4331 | /* Parse arguments */ |
4332 | progname = argv[0]; | |
4333 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4334 | goto error; |
fac6795d DG |
4335 | } |
4336 | ||
4337 | /* Daemonize */ | |
4338 | if (opt_daemon) { | |
53094c05 DG |
4339 | ret = daemon(0, 0); |
4340 | if (ret < 0) { | |
4341 | perror("daemon"); | |
cf3af59e | 4342 | goto error; |
53094c05 | 4343 | } |
fac6795d DG |
4344 | } |
4345 | ||
4346 | /* Check if daemon is UID = 0 */ | |
4347 | is_root = !getuid(); | |
4348 | ||
fac6795d | 4349 | if (is_root) { |
67e40797 DG |
4350 | rundir = strdup(LTTNG_RUNDIR); |
4351 | ||
4352 | /* Create global run dir with root access */ | |
4353 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4354 | if (ret < 0) { |
cf3af59e | 4355 | goto error; |
d6f42150 DG |
4356 | } |
4357 | ||
fac6795d | 4358 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4359 | snprintf(apps_unix_sock_path, PATH_MAX, |
4360 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4361 | } |
4362 | ||
4363 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4364 | snprintf(client_unix_sock_path, PATH_MAX, |
4365 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4366 | } | |
0fdd1e2c DG |
4367 | |
4368 | /* Set global SHM for ust */ | |
4369 | if (strlen(wait_shm_path) == 0) { | |
4370 | snprintf(wait_shm_path, PATH_MAX, | |
4371 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4372 | } | |
67e40797 DG |
4373 | |
4374 | /* Setup kernel consumerd path */ | |
4375 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
4376 | KCONSUMERD_ERR_SOCK_PATH, rundir); | |
4377 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
4378 | KCONSUMERD_CMD_SOCK_PATH, rundir); | |
4379 | ||
4380 | DBG2("Kernel consumer err path: %s", | |
4381 | kconsumer_data.err_unix_sock_path); | |
4382 | DBG2("Kernel consumer cmd path: %s", | |
4383 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4384 | } else { |
b082db07 DG |
4385 | home_path = get_home_dir(); |
4386 | if (home_path == NULL) { | |
273ea72c DG |
4387 | /* TODO: Add --socket PATH option */ |
4388 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4389 | ret = -EPERM; |
4390 | goto error; | |
b082db07 DG |
4391 | } |
4392 | ||
67e40797 DG |
4393 | /* |
4394 | * Create rundir from home path. This will create something like | |
4395 | * $HOME/.lttng | |
4396 | */ | |
4397 | ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); | |
4398 | if (ret < 0) { | |
4399 | ret = -ENOMEM; | |
4400 | goto error; | |
4401 | } | |
4402 | ||
4403 | ret = create_lttng_rundir(rundir); | |
4404 | if (ret < 0) { | |
4405 | goto error; | |
4406 | } | |
4407 | ||
fac6795d | 4408 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4409 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4410 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4411 | } |
4412 | ||
4413 | /* Set the cli tool unix socket path */ | |
4414 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4415 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4416 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4417 | } |
0fdd1e2c DG |
4418 | |
4419 | /* Set global SHM for ust */ | |
4420 | if (strlen(wait_shm_path) == 0) { | |
4421 | snprintf(wait_shm_path, PATH_MAX, | |
4422 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4423 | } | |
fac6795d DG |
4424 | } |
4425 | ||
847177cd DG |
4426 | DBG("Client socket path %s", client_unix_sock_path); |
4427 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4428 | DBG("LTTng run directory path: %s", rundir); |
4429 | ||
4430 | /* 32 bits consumerd path setup */ | |
4431 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
4432 | USTCONSUMERD32_ERR_SOCK_PATH, rundir); | |
4433 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
4434 | USTCONSUMERD32_CMD_SOCK_PATH, rundir); | |
4435 | ||
4436 | DBG2("UST consumer 32 bits err path: %s", | |
4437 | ustconsumer32_data.err_unix_sock_path); | |
4438 | DBG2("UST consumer 32 bits cmd path: %s", | |
4439 | ustconsumer32_data.cmd_unix_sock_path); | |
4440 | ||
4441 | /* 64 bits consumerd path setup */ | |
4442 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
4443 | USTCONSUMERD64_ERR_SOCK_PATH, rundir); | |
4444 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
4445 | USTCONSUMERD64_CMD_SOCK_PATH, rundir); | |
4446 | ||
4447 | DBG2("UST consumer 64 bits err path: %s", | |
4448 | ustconsumer64_data.err_unix_sock_path); | |
4449 | DBG2("UST consumer 64 bits cmd path: %s", | |
4450 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4451 | |
273ea72c | 4452 | /* |
7d8234d9 | 4453 | * See if daemon already exist. |
fac6795d | 4454 | */ |
7d8234d9 | 4455 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4456 | ERR("Already running daemon.\n"); |
273ea72c | 4457 | /* |
cf3af59e MD |
4458 | * We do not goto exit because we must not cleanup() |
4459 | * because a daemon is already running. | |
ab118b20 | 4460 | */ |
cf3af59e | 4461 | goto error; |
a88df331 DG |
4462 | } |
4463 | ||
54d01ffb | 4464 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4465 | |
4466 | /* | |
4467 | * These actions must be executed as root. We do that *after* setting up | |
4468 | * the sockets path because we MUST make the check for another daemon using | |
4469 | * those paths *before* trying to set the kernel consumer sockets and init | |
4470 | * kernel tracer. | |
4471 | */ | |
4472 | if (is_root) { | |
67e40797 | 4473 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4474 | if (ret < 0) { |
4475 | goto exit; | |
4476 | } | |
4477 | ||
a88df331 | 4478 | /* Setup kernel tracer */ |
4fba7219 DG |
4479 | if (!opt_no_kernel) { |
4480 | init_kernel_tracer(); | |
4481 | } | |
a88df331 DG |
4482 | |
4483 | /* Set ulimit for open files */ | |
4484 | set_ulimit(); | |
fac6795d DG |
4485 | } |
4486 | ||
67e40797 DG |
4487 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4488 | if (ret < 0) { | |
4489 | goto exit; | |
4490 | } | |
4491 | ||
4492 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4493 | if (ret < 0) { | |
4494 | goto exit; | |
4495 | } | |
4496 | ||
cf3af59e MD |
4497 | if ((ret = set_signal_handler()) < 0) { |
4498 | goto exit; | |
fac6795d DG |
4499 | } |
4500 | ||
d6f42150 | 4501 | /* Setup the needed unix socket */ |
cf3af59e MD |
4502 | if ((ret = init_daemon_socket()) < 0) { |
4503 | goto exit; | |
fac6795d DG |
4504 | } |
4505 | ||
4506 | /* Set credentials to socket */ | |
be040666 | 4507 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4508 | goto exit; |
fac6795d DG |
4509 | } |
4510 | ||
5b8719f5 DG |
4511 | /* Get parent pid if -S, --sig-parent is specified. */ |
4512 | if (opt_sig_parent) { | |
4513 | ppid = getppid(); | |
4514 | } | |
4515 | ||
7a485870 | 4516 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4517 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4518 | goto exit; | |
7a485870 DG |
4519 | } |
4520 | ||
099e26bd DG |
4521 | /* Setup the thread apps communication pipe. */ |
4522 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4523 | goto exit; | |
4524 | } | |
4525 | ||
4526 | /* Init UST command queue. */ | |
4527 | cds_wfq_init(&ust_cmd_queue.queue); | |
4528 | ||
f6a9efaa DG |
4529 | /* Init UST app hash table */ |
4530 | ust_app_ht_alloc(); | |
4531 | ||
273ea72c | 4532 | /* |
54d01ffb DG |
4533 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4534 | * statically declared in session.c | |
273ea72c | 4535 | */ |
54d01ffb | 4536 | session_list_ptr = session_get_list(); |
b5541356 | 4537 | |
5eb91c98 DG |
4538 | /* Set up max poll set size */ |
4539 | lttng_poll_set_max_size(); | |
4540 | ||
cf3af59e | 4541 | /* Create thread to manage the client socket */ |
099e26bd DG |
4542 | ret = pthread_create(&client_thread, NULL, |
4543 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4544 | if (ret != 0) { |
099e26bd | 4545 | perror("pthread_create clients"); |
cf3af59e MD |
4546 | goto exit_client; |
4547 | } | |
fac6795d | 4548 | |
099e26bd DG |
4549 | /* Create thread to dispatch registration */ |
4550 | ret = pthread_create(&dispatch_thread, NULL, | |
4551 | thread_dispatch_ust_registration, (void *) NULL); | |
4552 | if (ret != 0) { | |
4553 | perror("pthread_create dispatch"); | |
4554 | goto exit_dispatch; | |
4555 | } | |
4556 | ||
4557 | /* Create thread to manage application registration. */ | |
4558 | ret = pthread_create(®_apps_thread, NULL, | |
4559 | thread_registration_apps, (void *) NULL); | |
4560 | if (ret != 0) { | |
4561 | perror("pthread_create registration"); | |
4562 | goto exit_reg_apps; | |
4563 | } | |
4564 | ||
cf3af59e | 4565 | /* Create thread to manage application socket */ |
54d01ffb DG |
4566 | ret = pthread_create(&apps_thread, NULL, |
4567 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4568 | if (ret != 0) { |
099e26bd | 4569 | perror("pthread_create apps"); |
cf3af59e MD |
4570 | goto exit_apps; |
4571 | } | |
fac6795d | 4572 | |
cf3af59e | 4573 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4574 | ret = pthread_create(&kernel_thread, NULL, |
4575 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4576 | if (ret != 0) { |
099e26bd | 4577 | perror("pthread_create kernel"); |
cf3af59e MD |
4578 | goto exit_kernel; |
4579 | } | |
7a485870 | 4580 | |
b25a8868 DG |
4581 | tracepoint(sessiond_boot_end); |
4582 | ||
cf3af59e MD |
4583 | ret = pthread_join(kernel_thread, &status); |
4584 | if (ret != 0) { | |
4585 | perror("pthread_join"); | |
4586 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4587 | } |
4588 | ||
cf3af59e MD |
4589 | exit_kernel: |
4590 | ret = pthread_join(apps_thread, &status); | |
4591 | if (ret != 0) { | |
4592 | perror("pthread_join"); | |
4593 | goto error; /* join error, exit without cleanup */ | |
4594 | } | |
fac6795d | 4595 | |
cf3af59e | 4596 | exit_apps: |
099e26bd DG |
4597 | ret = pthread_join(reg_apps_thread, &status); |
4598 | if (ret != 0) { | |
4599 | perror("pthread_join"); | |
4600 | goto error; /* join error, exit without cleanup */ | |
4601 | } | |
4602 | ||
4603 | exit_reg_apps: | |
4604 | ret = pthread_join(dispatch_thread, &status); | |
4605 | if (ret != 0) { | |
4606 | perror("pthread_join"); | |
4607 | goto error; /* join error, exit without cleanup */ | |
4608 | } | |
4609 | ||
4610 | exit_dispatch: | |
cf3af59e MD |
4611 | ret = pthread_join(client_thread, &status); |
4612 | if (ret != 0) { | |
4613 | perror("pthread_join"); | |
4614 | goto error; /* join error, exit without cleanup */ | |
4615 | } | |
4616 | ||
3bd1e081 | 4617 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4618 | if (ret != 0) { |
3bd1e081 | 4619 | perror("join_consumer"); |
cf3af59e MD |
4620 | goto error; /* join error, exit without cleanup */ |
4621 | } | |
a88df331 | 4622 | |
cf3af59e | 4623 | exit_client: |
a88df331 | 4624 | exit: |
cf3af59e MD |
4625 | /* |
4626 | * cleanup() is called when no other thread is running. | |
4627 | */ | |
f6a9efaa | 4628 | rcu_thread_online(); |
cf3af59e | 4629 | cleanup(); |
f6a9efaa DG |
4630 | rcu_thread_offline(); |
4631 | rcu_unregister_thread(); | |
67e40797 | 4632 | if (!ret) { |
cf3af59e | 4633 | exit(EXIT_SUCCESS); |
67e40797 | 4634 | } |
cf3af59e | 4635 | error: |
5e16da05 | 4636 | exit(EXIT_FAILURE); |
fac6795d | 4637 | } |