Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
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 | ||
fb6f1fa2 YB |
179 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
180 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
181 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
182 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
183 | |
184 | static | |
7753dea8 | 185 | void setup_consumerd_path(void) |
fb09408a | 186 | { |
fc7a59ce | 187 | const char *bin, *libdir; |
fb09408a | 188 | |
7753dea8 MD |
189 | /* |
190 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
191 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
192 | * has not been defined. | |
7753dea8 | 193 | */ |
ebaeda94 | 194 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
195 | if (!consumerd32_bin[0]) { |
196 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
197 | } |
198 | if (!consumerd32_libdir[0]) { | |
199 | consumerd32_libdir = INSTALL_LIB_PATH; | |
200 | } | |
201 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
202 | if (!consumerd64_bin[0]) { |
203 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 204 | } |
ebaeda94 MD |
205 | if (!consumerd64_libdir[0]) { |
206 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
207 | } |
208 | #else | |
209 | #error "Unknown bitness" | |
210 | #endif | |
211 | ||
fb09408a MD |
212 | /* |
213 | * runtime env. var. overrides the build default. | |
214 | */ | |
fc7a59ce AM |
215 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
216 | if (bin) { | |
217 | consumerd32_bin = bin; | |
7753dea8 | 218 | } |
fc7a59ce AM |
219 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
220 | if (bin) { | |
221 | consumerd64_bin = bin; | |
ebaeda94 MD |
222 | } |
223 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
224 | if (libdir) { | |
225 | consumerd32_libdir = libdir; | |
226 | } | |
227 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
228 | if (libdir) { | |
229 | consumerd64_libdir = libdir; | |
fb09408a MD |
230 | } |
231 | } | |
232 | ||
5eb91c98 DG |
233 | /* |
234 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
235 | */ | |
236 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
237 | unsigned int size) | |
238 | { | |
239 | int ret; | |
240 | ||
241 | if (events == NULL || size == 0) { | |
242 | ret = -1; | |
243 | goto error; | |
244 | } | |
245 | ||
246 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
247 | if (ret < 0) { | |
248 | goto error; | |
249 | } | |
250 | ||
251 | /* Add quit pipe */ | |
252 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
253 | if (ret < 0) { | |
254 | goto error; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | ||
259 | error: | |
260 | return ret; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Check if the thread quit pipe was triggered. | |
265 | * | |
266 | * Return 1 if it was triggered else 0; | |
267 | */ | |
268 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
269 | { | |
270 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
271 | return 1; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
0fdd1e2c DG |
277 | /* |
278 | * Remove modules in reverse load order. | |
279 | */ | |
280 | static int modprobe_remove_kernel_modules(void) | |
281 | { | |
282 | int ret = 0, i; | |
283 | char modprobe[256]; | |
284 | ||
285 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
286 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 287 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
288 | kernel_modules_list[i].name); |
289 | if (ret < 0) { | |
24b487b8 | 290 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
291 | goto error; |
292 | } | |
293 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
294 | ret = system(modprobe); | |
295 | if (ret == -1) { | |
24b487b8 | 296 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
297 | kernel_modules_list[i].name); |
298 | } else if (kernel_modules_list[i].required | |
299 | && WEXITSTATUS(ret) != 0) { | |
300 | ERR("Unable to remove module %s", | |
301 | kernel_modules_list[i].name); | |
302 | } else { | |
303 | DBG("Modprobe removal successful %s", | |
304 | kernel_modules_list[i].name); | |
305 | } | |
306 | } | |
307 | ||
308 | error: | |
309 | return ret; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Return group ID of the tracing group or -1 if not found. | |
314 | */ | |
996b65c8 MD |
315 | static gid_t allowed_group(void) |
316 | { | |
317 | struct group *grp; | |
318 | ||
274e143b MD |
319 | if (opt_tracing_group) { |
320 | grp = getgrnam(opt_tracing_group); | |
321 | } else { | |
322 | grp = getgrnam(default_tracing_group); | |
323 | } | |
996b65c8 MD |
324 | if (!grp) { |
325 | return -1; | |
326 | } else { | |
327 | return grp->gr_gid; | |
328 | } | |
329 | } | |
330 | ||
273ea72c | 331 | /* |
5eb91c98 | 332 | * Init thread quit pipe. |
273ea72c DG |
333 | * |
334 | * Return -1 on error or 0 if all pipes are created. | |
335 | */ | |
336 | static int init_thread_quit_pipe(void) | |
337 | { | |
338 | int ret; | |
339 | ||
340 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
341 | if (ret < 0) { | |
342 | perror("thread quit pipe"); | |
343 | goto error; | |
344 | } | |
345 | ||
346 | error: | |
347 | return ret; | |
348 | } | |
349 | ||
fac6795d | 350 | /* |
d063d709 DG |
351 | * Complete teardown of a kernel session. This free all data structure related |
352 | * to a kernel session and update counter. | |
fac6795d | 353 | */ |
1d4b027a | 354 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 355 | { |
8f7a84dd DG |
356 | if (!session->kernel_session) { |
357 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 358 | return; |
8f7a84dd | 359 | } |
d9800920 | 360 | |
84ea9c99 | 361 | DBG("Tearing down kernel session"); |
d9800920 | 362 | |
84ea9c99 MD |
363 | /* |
364 | * If a custom kernel consumer was registered, close the socket before | |
365 | * tearing down the complete kernel session structure | |
366 | */ | |
367 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
368 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 369 | } |
84ea9c99 MD |
370 | |
371 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
372 | } |
373 | ||
f6a9efaa DG |
374 | /* |
375 | * Complete teardown of all UST sessions. This will free everything on his path | |
376 | * and destroy the core essence of all ust sessions :) | |
377 | */ | |
378 | static void teardown_ust_session(struct ltt_session *session) | |
379 | { | |
84cd17c6 MD |
380 | int ret; |
381 | ||
8f7a84dd DG |
382 | if (!session->ust_session) { |
383 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 384 | return; |
8f7a84dd DG |
385 | } |
386 | ||
f6a9efaa DG |
387 | DBG("Tearing down UST session(s)"); |
388 | ||
84cd17c6 MD |
389 | ret = ust_app_destroy_trace_all(session->ust_session); |
390 | if (ret) { | |
391 | ERR("Error in ust_app_destroy_trace_all"); | |
392 | } | |
8f7a84dd | 393 | |
f6a9efaa DG |
394 | trace_ust_destroy_session(session->ust_session); |
395 | } | |
396 | ||
099e26bd DG |
397 | /* |
398 | * Stop all threads by closing the thread quit pipe. | |
399 | */ | |
cf3af59e MD |
400 | static void stop_threads(void) |
401 | { | |
5eb91c98 DG |
402 | int ret; |
403 | ||
cf3af59e MD |
404 | /* Stopping all threads */ |
405 | DBG("Terminating all threads"); | |
54d01ffb | 406 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
407 | if (ret < 0) { |
408 | ERR("write error on thread quit pipe"); | |
409 | } | |
410 | ||
099e26bd DG |
411 | /* Dispatch thread */ |
412 | dispatch_thread_exit = 1; | |
413 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
414 | } |
415 | ||
fac6795d | 416 | /* |
d063d709 | 417 | * Cleanup the daemon |
fac6795d | 418 | */ |
cf3af59e | 419 | static void cleanup(void) |
fac6795d | 420 | { |
1d4b027a DG |
421 | int ret; |
422 | char *cmd; | |
af9737e9 | 423 | struct ltt_session *sess, *stmp; |
fac6795d | 424 | |
1d4b027a | 425 | DBG("Cleaning up"); |
e07ae692 | 426 | |
67e40797 DG |
427 | DBG("Removing %s directory", rundir); |
428 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
429 | if (ret < 0) { | |
430 | ERR("asprintf failed. Something is really wrong!"); | |
431 | } | |
5461b305 | 432 | |
67e40797 DG |
433 | /* Remove lttng run directory */ |
434 | ret = system(cmd); | |
435 | if (ret < 0) { | |
436 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 437 | } |
67e40797 | 438 | free(cmd); |
5461b305 | 439 | |
1d4b027a | 440 | DBG("Cleaning up all session"); |
fac6795d | 441 | |
b5541356 | 442 | /* Destroy session list mutex */ |
273ea72c DG |
443 | if (session_list_ptr != NULL) { |
444 | pthread_mutex_destroy(&session_list_ptr->lock); | |
445 | ||
446 | /* Cleanup ALL session */ | |
54d01ffb DG |
447 | cds_list_for_each_entry_safe(sess, stmp, |
448 | &session_list_ptr->head, list) { | |
273ea72c | 449 | teardown_kernel_session(sess); |
f6a9efaa DG |
450 | teardown_ust_session(sess); |
451 | free(sess); | |
273ea72c DG |
452 | } |
453 | } | |
454 | ||
099e26bd | 455 | DBG("Closing all UST sockets"); |
56fff090 | 456 | ust_app_clean_list(); |
099e26bd | 457 | |
3bd1e081 | 458 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 459 | |
4fba7219 DG |
460 | if (is_root && !opt_no_kernel) { |
461 | DBG2("Closing kernel fd"); | |
462 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
463 | DBG("Unloading kernel modules"); |
464 | modprobe_remove_kernel_modules(); | |
465 | } | |
b25a8868 | 466 | |
5eb91c98 DG |
467 | close(thread_quit_pipe[0]); |
468 | close(thread_quit_pipe[1]); | |
dab4c8a1 | 469 | |
3c6bae61 DG |
470 | /* OUTPUT BENCHMARK RESULTS */ |
471 | bench_init(); | |
472 | ||
62d53818 DG |
473 | if (getenv("BENCH_UST_NOTIFY")) { |
474 | bench_print_ust_notification(); | |
475 | } | |
476 | ||
477 | if (getenv("BENCH_UST_REGISTER")) { | |
478 | bench_print_ust_register(); | |
ccca3fea | 479 | bench_print_ust_unregister(); |
62d53818 DG |
480 | } |
481 | ||
482 | if (getenv("BENCH_BOOT_PROCESS")) { | |
483 | bench_print_boot_process(); | |
484 | } | |
3c6bae61 DG |
485 | |
486 | bench_close(); | |
487 | /* END BENCHMARK */ | |
bb3037a9 | 488 | |
421cb601 | 489 | /* <fun> */ |
f56a39af | 490 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
491 | "Matthew, BEET driven development works!%c[%dm", |
492 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
493 | /* </fun> */ | |
fac6795d DG |
494 | } |
495 | ||
e065084a | 496 | /* |
d063d709 | 497 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 498 | * |
d063d709 | 499 | * Return lttcomm error code. |
e065084a DG |
500 | */ |
501 | static int send_unix_sock(int sock, void *buf, size_t len) | |
502 | { | |
503 | /* Check valid length */ | |
504 | if (len <= 0) { | |
505 | return -1; | |
506 | } | |
507 | ||
508 | return lttcomm_send_unix_sock(sock, buf, len); | |
509 | } | |
510 | ||
5461b305 | 511 | /* |
d063d709 | 512 | * Free memory of a command context structure. |
5461b305 | 513 | */ |
a2fb29a5 | 514 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 515 | { |
a2fb29a5 DG |
516 | DBG("Clean command context structure"); |
517 | if (*cmd_ctx) { | |
518 | if ((*cmd_ctx)->llm) { | |
519 | free((*cmd_ctx)->llm); | |
5461b305 | 520 | } |
a2fb29a5 DG |
521 | if ((*cmd_ctx)->lsm) { |
522 | free((*cmd_ctx)->lsm); | |
5461b305 | 523 | } |
a2fb29a5 DG |
524 | free(*cmd_ctx); |
525 | *cmd_ctx = NULL; | |
5461b305 DG |
526 | } |
527 | } | |
528 | ||
f3ed775e | 529 | /* |
d063d709 | 530 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 531 | */ |
2bdd86d4 | 532 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
533 | int sock, struct ltt_kernel_channel *channel, |
534 | uid_t uid, gid_t gid) | |
f3ed775e DG |
535 | { |
536 | int ret; | |
f3ed775e | 537 | struct ltt_kernel_stream *stream; |
3bd1e081 | 538 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 539 | |
3bd1e081 | 540 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 541 | channel->channel->name); |
7a485870 | 542 | |
3bd1e081 MD |
543 | /* Send channel */ |
544 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
545 | lkm.u.channel.channel_key = channel->fd; | |
546 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
547 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 548 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 549 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 550 | if (ret < 0) { |
3bd1e081 | 551 | perror("send consumer channel"); |
f3ed775e DG |
552 | goto error; |
553 | } | |
554 | ||
3bd1e081 | 555 | /* Send streams */ |
7a485870 | 556 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
557 | if (!stream->fd) { |
558 | continue; | |
559 | } | |
560 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
561 | lkm.u.stream.channel_key = channel->fd; | |
562 | lkm.u.stream.stream_key = stream->fd; | |
563 | lkm.u.stream.state = stream->state; | |
564 | lkm.u.stream.output = channel->channel->attr.output; | |
565 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
566 | lkm.u.stream.uid = uid; |
567 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
568 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
569 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
570 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
571 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
572 | if (ret < 0) { | |
573 | perror("send consumer stream"); | |
574 | goto error; | |
575 | } | |
576 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
577 | if (ret < 0) { | |
578 | perror("send consumer stream ancillary data"); | |
579 | goto error; | |
f3ed775e DG |
580 | } |
581 | } | |
582 | ||
3bd1e081 | 583 | DBG("consumer channel streams sent"); |
f3ed775e DG |
584 | |
585 | return 0; | |
586 | ||
587 | error: | |
588 | return ret; | |
589 | } | |
590 | ||
591 | /* | |
d063d709 | 592 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 593 | */ |
2bdd86d4 | 594 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 595 | struct ltt_kernel_session *session) |
f3ed775e DG |
596 | { |
597 | int ret; | |
598 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
599 | struct lttcomm_consumer_msg lkm; |
600 | int sock = session->consumer_fd; | |
7a485870 DG |
601 | |
602 | DBG("Sending metadata stream fd"); | |
603 | ||
2bdd86d4 | 604 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 605 | if (session->consumer_fd == 0) { |
3bd1e081 | 606 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
607 | } |
608 | ||
7a485870 | 609 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
610 | /* Send metadata channel fd */ |
611 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
612 | lkm.u.channel.channel_key = session->metadata->fd; | |
613 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
614 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
615 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
616 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
617 | if (ret < 0) { | |
618 | perror("send consumer channel"); | |
619 | goto error; | |
620 | } | |
621 | ||
622 | /* Send metadata stream fd */ | |
623 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
624 | lkm.u.stream.channel_key = session->metadata->fd; | |
625 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
626 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
627 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
628 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
629 | lkm.u.stream.uid = session->uid; |
630 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
631 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
632 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
633 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
634 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
7a485870 | 635 | if (ret < 0) { |
3bd1e081 MD |
636 | perror("send consumer stream"); |
637 | goto error; | |
638 | } | |
639 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 640 | if (ret < 0) { |
3bd1e081 | 641 | perror("send consumer stream"); |
7a485870 DG |
642 | goto error; |
643 | } | |
644 | } | |
f3ed775e | 645 | |
f3ed775e | 646 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
647 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
648 | session->uid, session->gid); | |
f3ed775e | 649 | if (ret < 0) { |
7a485870 | 650 | goto error; |
f3ed775e DG |
651 | } |
652 | } | |
653 | ||
2bdd86d4 | 654 | DBG("consumer fds (metadata and channel streams) sent"); |
7a485870 | 655 | |
f3ed775e DG |
656 | return 0; |
657 | ||
658 | error: | |
659 | return ret; | |
660 | } | |
661 | ||
fac6795d | 662 | /* |
0fdd1e2c | 663 | * Notify UST applications using the shm mmap futex. |
fac6795d | 664 | */ |
0fdd1e2c | 665 | static int notify_ust_apps(int active) |
fac6795d | 666 | { |
0fdd1e2c | 667 | char *wait_shm_mmap; |
fac6795d | 668 | |
0fdd1e2c | 669 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 670 | |
62d53818 DG |
671 | tracepoint(ust_notify_apps_start); |
672 | ||
0fdd1e2c DG |
673 | /* See shm.c for this call implying mmap, shm and futex calls */ |
674 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
675 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
676 | goto error; |
677 | } | |
678 | ||
0fdd1e2c DG |
679 | /* Wake waiting process */ |
680 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
681 | ||
62d53818 DG |
682 | tracepoint(ust_notify_apps_stop); |
683 | ||
0fdd1e2c DG |
684 | /* Apps notified successfully */ |
685 | return 0; | |
fac6795d DG |
686 | |
687 | error: | |
0fdd1e2c | 688 | return -1; |
fac6795d DG |
689 | } |
690 | ||
e065084a | 691 | /* |
d063d709 DG |
692 | * Setup the outgoing data buffer for the response (llm) by allocating the |
693 | * right amount of memory and copying the original information from the lsm | |
694 | * structure. | |
ca95a216 | 695 | * |
d063d709 | 696 | * Return total size of the buffer pointed by buf. |
ca95a216 | 697 | */ |
5461b305 | 698 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 699 | { |
f3ed775e | 700 | int ret, buf_size; |
ca95a216 | 701 | |
f3ed775e | 702 | buf_size = size; |
5461b305 | 703 | |
ba7f0ae5 | 704 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 705 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 706 | perror("zmalloc"); |
5461b305 | 707 | ret = -ENOMEM; |
ca95a216 DG |
708 | goto error; |
709 | } | |
710 | ||
5461b305 DG |
711 | /* Copy common data */ |
712 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 713 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 714 | |
5461b305 DG |
715 | cmd_ctx->llm->data_size = size; |
716 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
717 | ||
ca95a216 DG |
718 | return buf_size; |
719 | ||
720 | error: | |
721 | return ret; | |
722 | } | |
723 | ||
7a485870 | 724 | /* |
5eb91c98 | 725 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 726 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 727 | */ |
5eb91c98 | 728 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 729 | { |
5eb91c98 | 730 | int ret; |
7a485870 DG |
731 | struct ltt_session *session; |
732 | struct ltt_kernel_channel *channel; | |
733 | ||
5eb91c98 | 734 | DBG("Updating kernel poll set"); |
7a485870 | 735 | |
54d01ffb | 736 | session_lock_list(); |
b5541356 | 737 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 738 | session_lock(session); |
7a485870 | 739 | if (session->kernel_session == NULL) { |
54d01ffb | 740 | session_unlock(session); |
7a485870 DG |
741 | continue; |
742 | } | |
7a485870 | 743 | |
54d01ffb DG |
744 | cds_list_for_each_entry(channel, |
745 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
746 | /* Add channel fd to the kernel poll set */ |
747 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
748 | if (ret < 0) { | |
54d01ffb | 749 | session_unlock(session); |
5eb91c98 DG |
750 | goto error; |
751 | } | |
752 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 753 | } |
54d01ffb | 754 | session_unlock(session); |
7a485870 | 755 | } |
54d01ffb | 756 | session_unlock_list(); |
7a485870 | 757 | |
5eb91c98 | 758 | return 0; |
7a485870 DG |
759 | |
760 | error: | |
54d01ffb | 761 | session_unlock_list(); |
7a485870 DG |
762 | return -1; |
763 | } | |
764 | ||
765 | /* | |
54d01ffb | 766 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 767 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 768 | * |
d063d709 | 769 | * Useful for CPU hotplug feature. |
7a485870 | 770 | */ |
2bdd86d4 | 771 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
772 | { |
773 | int ret = 0; | |
774 | struct ltt_session *session; | |
775 | struct ltt_kernel_channel *channel; | |
776 | ||
777 | DBG("Updating kernel streams for channel fd %d", fd); | |
778 | ||
54d01ffb | 779 | session_lock_list(); |
b5541356 | 780 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 781 | session_lock(session); |
7a485870 | 782 | if (session->kernel_session == NULL) { |
54d01ffb | 783 | session_unlock(session); |
7a485870 DG |
784 | continue; |
785 | } | |
d9800920 DG |
786 | |
787 | /* This is not suppose to be 0 but this is an extra security check */ | |
788 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 789 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
790 | } |
791 | ||
5eb91c98 DG |
792 | cds_list_for_each_entry(channel, |
793 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
794 | if (channel->fd == fd) { |
795 | DBG("Channel found, updating kernel streams"); | |
796 | ret = kernel_open_channel_stream(channel); | |
797 | if (ret < 0) { | |
b3c750d2 | 798 | goto error; |
7a485870 | 799 | } |
d9800920 | 800 | |
7a485870 | 801 | /* |
5eb91c98 DG |
802 | * Have we already sent fds to the consumer? If yes, it means |
803 | * that tracing is started so it is safe to send our updated | |
804 | * stream fds. | |
7a485870 | 805 | */ |
3bd1e081 | 806 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 807 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
808 | session->kernel_session->consumer_fd, channel, |
809 | session->uid, session->gid); | |
7a485870 | 810 | if (ret < 0) { |
b3c750d2 | 811 | goto error; |
7a485870 DG |
812 | } |
813 | } | |
b3c750d2 | 814 | goto error; |
7a485870 DG |
815 | } |
816 | } | |
54d01ffb | 817 | session_unlock(session); |
7a485870 | 818 | } |
54d01ffb | 819 | session_unlock_list(); |
b3c750d2 | 820 | return ret; |
7a485870 | 821 | |
b3c750d2 | 822 | error: |
54d01ffb DG |
823 | session_unlock(session); |
824 | session_unlock_list(); | |
7a485870 DG |
825 | return ret; |
826 | } | |
827 | ||
487cf67c DG |
828 | /* |
829 | * For each tracing session, update newly registered apps. | |
830 | */ | |
831 | static void update_ust_app(int app_sock) | |
832 | { | |
833 | struct ltt_session *sess, *stmp; | |
834 | ||
835 | /* For all tracing session(s) */ | |
836 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
837 | if (sess->ust_session) { |
838 | ust_app_global_update(sess->ust_session, app_sock); | |
839 | } | |
487cf67c DG |
840 | } |
841 | } | |
842 | ||
7a485870 | 843 | /* |
d063d709 | 844 | * This thread manage event coming from the kernel. |
7a485870 | 845 | * |
d063d709 DG |
846 | * Features supported in this thread: |
847 | * -) CPU Hotplug | |
7a485870 DG |
848 | */ |
849 | static void *thread_manage_kernel(void *data) | |
850 | { | |
5eb91c98 DG |
851 | int ret, i, pollfd, update_poll_flag = 1; |
852 | uint32_t revents, nb_fd; | |
7a485870 | 853 | char tmp; |
5eb91c98 | 854 | struct lttng_poll_event events; |
7a485870 | 855 | |
b25a8868 DG |
856 | tracepoint(sessiond_th_kern_start); |
857 | ||
7a485870 DG |
858 | DBG("Thread manage kernel started"); |
859 | ||
5eb91c98 DG |
860 | ret = create_thread_poll_set(&events, 2); |
861 | if (ret < 0) { | |
862 | goto error; | |
863 | } | |
864 | ||
865 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
866 | if (ret < 0) { | |
867 | goto error; | |
868 | } | |
869 | ||
7a485870 DG |
870 | while (1) { |
871 | if (update_poll_flag == 1) { | |
5f822d0a DG |
872 | /* |
873 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
874 | * quit pipe and the kernel pipe. | |
875 | */ | |
876 | events.nb_fd = 2; | |
877 | ||
5eb91c98 DG |
878 | ret = update_kernel_poll(&events); |
879 | if (ret < 0) { | |
7a485870 DG |
880 | goto error; |
881 | } | |
882 | update_poll_flag = 0; | |
883 | } | |
884 | ||
5eb91c98 DG |
885 | nb_fd = LTTNG_POLL_GETNB(&events); |
886 | ||
887 | DBG("Thread kernel polling on %d fds", nb_fd); | |
888 | ||
889 | /* Zeroed the poll events */ | |
890 | lttng_poll_reset(&events); | |
7a485870 | 891 | |
b25a8868 DG |
892 | tracepoint(sessiond_th_kern_poll); |
893 | ||
7a485870 | 894 | /* Poll infinite value of time */ |
5eb91c98 | 895 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 896 | if (ret < 0) { |
7a485870 DG |
897 | goto error; |
898 | } else if (ret == 0) { | |
899 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
900 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
901 | "This should not have happened! Continuing..."); | |
7a485870 DG |
902 | continue; |
903 | } | |
904 | ||
5eb91c98 DG |
905 | for (i = 0; i < nb_fd; i++) { |
906 | /* Fetch once the poll data */ | |
907 | revents = LTTNG_POLL_GETEV(&events, i); | |
908 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 909 | |
5eb91c98 DG |
910 | /* Thread quit pipe has been closed. Killing thread. */ |
911 | ret = check_thread_quit_pipe(pollfd, revents); | |
912 | if (ret) { | |
913 | goto error; | |
914 | } | |
7a485870 | 915 | |
5eb91c98 DG |
916 | /* Check for data on kernel pipe */ |
917 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
918 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
919 | update_poll_flag = 1; | |
920 | continue; | |
921 | } else { | |
922 | /* | |
923 | * New CPU detected by the kernel. Adding kernel stream to | |
924 | * kernel session and updating the kernel consumer | |
925 | */ | |
926 | if (revents & LPOLLIN) { | |
2bdd86d4 | 927 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
928 | if (ret < 0) { |
929 | continue; | |
930 | } | |
931 | break; | |
932 | /* | |
933 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
934 | * and unregister kernel stream at this point. | |
935 | */ | |
7a485870 | 936 | } |
7a485870 DG |
937 | } |
938 | } | |
939 | } | |
940 | ||
941 | error: | |
942 | DBG("Kernel thread dying"); | |
273ea72c DG |
943 | close(kernel_poll_pipe[0]); |
944 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
945 | |
946 | lttng_poll_clean(&events); | |
947 | ||
7a485870 DG |
948 | return NULL; |
949 | } | |
950 | ||
1d4b027a | 951 | /* |
3bd1e081 | 952 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 953 | */ |
3bd1e081 | 954 | static void *thread_manage_consumer(void *data) |
1d4b027a | 955 | { |
5eb91c98 DG |
956 | int sock = 0, i, ret, pollfd; |
957 | uint32_t revents, nb_fd; | |
1d4b027a | 958 | enum lttcomm_return_code code; |
5eb91c98 | 959 | struct lttng_poll_event events; |
3bd1e081 | 960 | struct consumer_data *consumer_data = data; |
1d4b027a | 961 | |
b25a8868 DG |
962 | tracepoint(sessiond_th_kcon_start); |
963 | ||
3bd1e081 | 964 | DBG("[thread] Manage consumer started"); |
1d4b027a | 965 | |
3bd1e081 | 966 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
967 | if (ret < 0) { |
968 | goto error; | |
969 | } | |
970 | ||
5eb91c98 DG |
971 | /* |
972 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
973 | * Nothing more will be added to this poll set. | |
974 | */ | |
975 | ret = create_thread_poll_set(&events, 2); | |
976 | if (ret < 0) { | |
977 | goto error; | |
978 | } | |
273ea72c | 979 | |
3bd1e081 | 980 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
981 | if (ret < 0) { |
982 | goto error; | |
983 | } | |
273ea72c | 984 | |
5eb91c98 | 985 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 986 | |
b25a8868 DG |
987 | tracepoint(sessiond_th_kcon_poll); |
988 | ||
273ea72c | 989 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 990 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 991 | if (ret < 0) { |
273ea72c DG |
992 | goto error; |
993 | } | |
994 | ||
5eb91c98 DG |
995 | for (i = 0; i < nb_fd; i++) { |
996 | /* Fetch once the poll data */ | |
997 | revents = LTTNG_POLL_GETEV(&events, i); | |
998 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
999 | ||
1000 | /* Thread quit pipe has been closed. Killing thread. */ | |
1001 | ret = check_thread_quit_pipe(pollfd, revents); | |
1002 | if (ret) { | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | /* Event on the registration socket */ | |
3bd1e081 | 1007 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1008 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1009 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1010 | goto error; |
1011 | } | |
1012 | } | |
273ea72c DG |
1013 | } |
1014 | ||
3bd1e081 | 1015 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1016 | if (sock < 0) { |
1017 | goto error; | |
1018 | } | |
1019 | ||
3bd1e081 | 1020 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1021 | |
712ea556 | 1022 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1023 | ret = lttcomm_recv_unix_sock(sock, &code, |
1024 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1025 | if (ret <= 0) { |
1026 | goto error; | |
1027 | } | |
1028 | ||
3bd1e081 MD |
1029 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1030 | consumer_data->cmd_sock = | |
1031 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1032 | if (consumer_data->cmd_sock < 0) { | |
1033 | sem_post(&consumer_data->sem); | |
48842b30 | 1034 | PERROR("consumer connect"); |
1d4b027a DG |
1035 | goto error; |
1036 | } | |
1037 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1038 | sem_post(&consumer_data->sem); |
1039 | DBG("consumer command socket ready"); | |
1d4b027a | 1040 | } else { |
3bd1e081 | 1041 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1042 | lttcomm_get_readable_code(-code)); |
1043 | goto error; | |
1044 | } | |
1045 | ||
54d01ffb | 1046 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1047 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1048 | if (ret < 0) { |
72079cae DG |
1049 | goto error; |
1050 | } | |
1051 | ||
5eb91c98 DG |
1052 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1053 | if (ret < 0) { | |
72079cae | 1054 | goto error; |
5eb91c98 DG |
1055 | } |
1056 | ||
1057 | /* Update number of fd */ | |
1058 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1059 | ||
1060 | /* Inifinite blocking call, waiting for transmission */ | |
1061 | ret = lttng_poll_wait(&events, -1); | |
1062 | if (ret < 0) { | |
72079cae DG |
1063 | goto error; |
1064 | } | |
1065 | ||
5eb91c98 DG |
1066 | for (i = 0; i < nb_fd; i++) { |
1067 | /* Fetch once the poll data */ | |
1068 | revents = LTTNG_POLL_GETEV(&events, i); | |
1069 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1070 | ||
1071 | /* Thread quit pipe has been closed. Killing thread. */ | |
1072 | ret = check_thread_quit_pipe(pollfd, revents); | |
1073 | if (ret) { | |
1074 | goto error; | |
1075 | } | |
1076 | ||
1077 | /* Event on the kconsumerd socket */ | |
1078 | if (pollfd == sock) { | |
1079 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1080 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1081 | goto error; |
1082 | } | |
1083 | } | |
1084 | } | |
1085 | ||
712ea556 | 1086 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1087 | ret = lttcomm_recv_unix_sock(sock, &code, |
1088 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1089 | if (ret <= 0) { |
3bd1e081 | 1090 | ERR("consumer closed the command socket"); |
712ea556 | 1091 | goto error; |
6f61d021 | 1092 | } |
1d4b027a | 1093 | |
3bd1e081 | 1094 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1095 | |
1d4b027a | 1096 | error: |
3bd1e081 MD |
1097 | DBG("consumer thread dying"); |
1098 | close(consumer_data->err_sock); | |
1099 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1100 | close(sock); |
273ea72c | 1101 | |
3bd1e081 MD |
1102 | unlink(consumer_data->err_unix_sock_path); |
1103 | unlink(consumer_data->cmd_unix_sock_path); | |
1104 | consumer_data->pid = 0; | |
0177d773 | 1105 | |
5eb91c98 | 1106 | lttng_poll_clean(&events); |
0177d773 | 1107 | |
5eb91c98 | 1108 | return NULL; |
099e26bd DG |
1109 | } |
1110 | ||
099e26bd DG |
1111 | /* |
1112 | * This thread manage application communication. | |
1d4b027a DG |
1113 | */ |
1114 | static void *thread_manage_apps(void *data) | |
099e26bd | 1115 | { |
5eb91c98 DG |
1116 | int i, ret, pollfd; |
1117 | uint32_t revents, nb_fd; | |
099e26bd | 1118 | struct ust_command ust_cmd; |
5eb91c98 | 1119 | struct lttng_poll_event events; |
099e26bd | 1120 | |
85c434ee DG |
1121 | tracepoint(sessiond_th_apps_start); |
1122 | ||
099e26bd DG |
1123 | DBG("[thread] Manage application started"); |
1124 | ||
f6a9efaa DG |
1125 | rcu_register_thread(); |
1126 | rcu_thread_online(); | |
1127 | ||
5eb91c98 DG |
1128 | ret = create_thread_poll_set(&events, 2); |
1129 | if (ret < 0) { | |
1130 | goto error; | |
1131 | } | |
099e26bd | 1132 | |
5eb91c98 DG |
1133 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1134 | if (ret < 0) { | |
1135 | goto error; | |
1136 | } | |
099e26bd | 1137 | |
5eb91c98 DG |
1138 | while (1) { |
1139 | /* Zeroed the events structure */ | |
1140 | lttng_poll_reset(&events); | |
0177d773 | 1141 | |
5eb91c98 | 1142 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1143 | |
1144 | DBG("Apps thread polling on %d fds", nb_fd); | |
1145 | ||
85c434ee DG |
1146 | tracepoint(sessiond_th_apps_poll); |
1147 | ||
099e26bd | 1148 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1149 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1150 | if (ret < 0) { |
099e26bd DG |
1151 | goto error; |
1152 | } | |
1153 | ||
5eb91c98 DG |
1154 | for (i = 0; i < nb_fd; i++) { |
1155 | /* Fetch once the poll data */ | |
1156 | revents = LTTNG_POLL_GETEV(&events, i); | |
1157 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1158 | ||
1159 | /* Thread quit pipe has been closed. Killing thread. */ | |
1160 | ret = check_thread_quit_pipe(pollfd, revents); | |
1161 | if (ret) { | |
099e26bd | 1162 | goto error; |
5eb91c98 | 1163 | } |
62d53818 | 1164 | |
5eb91c98 DG |
1165 | /* Inspect the apps cmd pipe */ |
1166 | if (pollfd == apps_cmd_pipe[0]) { | |
1167 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1168 | ERR("Apps command pipe error"); | |
0177d773 | 1169 | goto error; |
5eb91c98 | 1170 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1171 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1172 | /* Empty pipe */ |
1173 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1174 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1175 | perror("read apps cmd pipe"); | |
1176 | goto error; | |
1177 | } | |
a89c7d1b | 1178 | tracepoint(ust_register_read_stop); |
099e26bd | 1179 | |
a89c7d1b | 1180 | tracepoint(ust_register_add_start); |
5eb91c98 | 1181 | /* Register applicaton to the session daemon */ |
56fff090 | 1182 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1183 | ust_cmd.sock); |
88ff5b7f | 1184 | if (ret == -ENOMEM) { |
5eb91c98 | 1185 | goto error; |
88ff5b7f MD |
1186 | } else if (ret < 0) { |
1187 | break; | |
5eb91c98 | 1188 | } |
a89c7d1b | 1189 | tracepoint(ust_register_add_stop); |
85c434ee | 1190 | |
a89c7d1b | 1191 | tracepoint(ust_register_done_start); |
acc7b41b MD |
1192 | /* |
1193 | * Add channel(s) and event(s) to newly registered apps | |
1194 | * from lttng global UST domain. | |
1195 | */ | |
1196 | update_ust_app(ust_cmd.sock); | |
1197 | ||
f2ca2e25 | 1198 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1199 | if (ret < 0) { |
1200 | /* | |
1201 | * If the registration is not possible, we simply | |
1202 | * unregister the apps and continue | |
1203 | */ | |
56fff090 | 1204 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1205 | } else { |
1206 | /* | |
1207 | * We just need here to monitor the close of the UST | |
1208 | * socket and poll set monitor those by default. | |
1209 | */ | |
1210 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1211 | if (ret < 0) { | |
1212 | goto error; | |
1213 | } | |
1214 | ||
54d01ffb DG |
1215 | DBG("Apps with sock %d added to poll set", |
1216 | ust_cmd.sock); | |
5eb91c98 | 1217 | } |
a89c7d1b | 1218 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1219 | break; |
0177d773 | 1220 | } |
5eb91c98 DG |
1221 | } else { |
1222 | /* | |
54d01ffb DG |
1223 | * At this point, we know that a registered application made |
1224 | * the event at poll_wait. | |
5eb91c98 DG |
1225 | */ |
1226 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
aa231298 DG |
1227 | tracepoint(ust_unregister_start); |
1228 | ||
5eb91c98 DG |
1229 | /* Removing from the poll set */ |
1230 | ret = lttng_poll_del(&events, pollfd); | |
1231 | if (ret < 0) { | |
1232 | goto error; | |
1233 | } | |
099e26bd | 1234 | |
b9d9b220 | 1235 | /* Socket closed on remote end. */ |
56fff090 | 1236 | ust_app_unregister(pollfd); |
aa231298 DG |
1237 | |
1238 | tracepoint(ust_unregister_stop); | |
5eb91c98 | 1239 | break; |
0177d773 | 1240 | } |
099e26bd DG |
1241 | } |
1242 | } | |
099e26bd DG |
1243 | } |
1244 | ||
1245 | error: | |
1246 | DBG("Application communication apps dying"); | |
1247 | close(apps_cmd_pipe[0]); | |
1248 | close(apps_cmd_pipe[1]); | |
1249 | ||
5eb91c98 | 1250 | lttng_poll_clean(&events); |
099e26bd | 1251 | |
f6a9efaa DG |
1252 | rcu_thread_offline(); |
1253 | rcu_unregister_thread(); | |
099e26bd DG |
1254 | return NULL; |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Dispatch request from the registration threads to the application | |
1259 | * communication thread. | |
1260 | */ | |
1261 | static void *thread_dispatch_ust_registration(void *data) | |
1262 | { | |
1263 | int ret; | |
1264 | struct cds_wfq_node *node; | |
1265 | struct ust_command *ust_cmd = NULL; | |
1266 | ||
85c434ee DG |
1267 | tracepoint(sessiond_th_dispatch_start); |
1268 | ||
099e26bd DG |
1269 | DBG("[thread] Dispatch UST command started"); |
1270 | ||
1271 | while (!dispatch_thread_exit) { | |
1272 | /* Atomically prepare the queue futex */ | |
1273 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1274 | ||
1275 | do { | |
85c434ee DG |
1276 | tracepoint(sessiond_th_dispatch_block); |
1277 | ||
099e26bd DG |
1278 | /* Dequeue command for registration */ |
1279 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1280 | if (node == NULL) { | |
00a17c97 | 1281 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1282 | /* Continue thread execution */ |
1283 | break; | |
1284 | } | |
1285 | ||
62d53818 DG |
1286 | tracepoint(ust_dispatch_register_start); |
1287 | ||
099e26bd DG |
1288 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1289 | ||
2f50c8a3 DG |
1290 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1291 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1292 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1293 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1294 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1295 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1296 | /* |
1297 | * Inform apps thread of the new application registration. This | |
1298 | * call is blocking so we can be assured that the data will be read | |
1299 | * at some point in time or wait to the end of the world :) | |
1300 | */ | |
1301 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1302 | sizeof(struct ust_command)); | |
1303 | if (ret < 0) { | |
1304 | perror("write apps cmd pipe"); | |
1305 | if (errno == EBADF) { | |
1306 | /* | |
1307 | * We can't inform the application thread to process | |
1308 | * registration. We will exit or else application | |
1309 | * registration will not occur and tracing will never | |
1310 | * start. | |
1311 | */ | |
1312 | goto error; | |
1313 | } | |
1314 | } | |
1315 | free(ust_cmd); | |
1316 | } while (node != NULL); | |
1317 | ||
62d53818 DG |
1318 | tracepoint(ust_dispatch_register_stop); |
1319 | ||
099e26bd DG |
1320 | /* Futex wait on queue. Blocking call on futex() */ |
1321 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1322 | } | |
1323 | ||
1324 | error: | |
1325 | DBG("Dispatch thread dying"); | |
1326 | return NULL; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * This thread manage application registration. | |
1331 | */ | |
1332 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1333 | { |
5eb91c98 DG |
1334 | int sock = 0, i, ret, pollfd; |
1335 | uint32_t revents, nb_fd; | |
1336 | struct lttng_poll_event events; | |
099e26bd DG |
1337 | /* |
1338 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1339 | * freed in the manage apps thread. | |
1340 | */ | |
1341 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1342 | |
62d53818 | 1343 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1344 | |
099e26bd | 1345 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1346 | |
1347 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1348 | if (ret < 0) { | |
1349 | goto error; | |
1350 | } | |
1351 | ||
5eb91c98 DG |
1352 | /* |
1353 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1354 | * more will be added to this poll set. | |
1355 | */ | |
1356 | ret = create_thread_poll_set(&events, 2); | |
1357 | if (ret < 0) { | |
1358 | goto error; | |
1359 | } | |
273ea72c | 1360 | |
5eb91c98 DG |
1361 | /* Add the application registration socket */ |
1362 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1363 | if (ret < 0) { | |
1364 | goto error; | |
1365 | } | |
273ea72c | 1366 | |
1d4b027a | 1367 | /* Notify all applications to register */ |
0fdd1e2c DG |
1368 | ret = notify_ust_apps(1); |
1369 | if (ret < 0) { | |
1370 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1371 | "Execution continues but there might be problem for already\n" |
1372 | "running applications that wishes to register."); | |
0fdd1e2c | 1373 | } |
1d4b027a DG |
1374 | |
1375 | while (1) { | |
1376 | DBG("Accepting application registration"); | |
273ea72c | 1377 | |
62d53818 | 1378 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1379 | |
5eb91c98 DG |
1380 | nb_fd = LTTNG_POLL_GETNB(&events); |
1381 | ||
273ea72c | 1382 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1383 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1384 | if (ret < 0) { |
273ea72c DG |
1385 | goto error; |
1386 | } | |
1387 | ||
5eb91c98 DG |
1388 | for (i = 0; i < nb_fd; i++) { |
1389 | /* Fetch once the poll data */ | |
1390 | revents = LTTNG_POLL_GETEV(&events, i); | |
1391 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1392 | |
5eb91c98 DG |
1393 | /* Thread quit pipe has been closed. Killing thread. */ |
1394 | ret = check_thread_quit_pipe(pollfd, revents); | |
1395 | if (ret) { | |
90014c57 DG |
1396 | goto error; |
1397 | } | |
62d53818 | 1398 | |
5eb91c98 DG |
1399 | /* Event on the registration socket */ |
1400 | if (pollfd == apps_sock) { | |
1401 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1402 | ERR("Register apps socket poll error"); | |
1403 | goto error; | |
1404 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1405 | /* Registration starts here. Recording cycles */ |
1406 | tracepoint(ust_register_start); | |
1d4b027a | 1407 | |
5eb91c98 DG |
1408 | sock = lttcomm_accept_unix_sock(apps_sock); |
1409 | if (sock < 0) { | |
1410 | goto error; | |
1411 | } | |
099e26bd | 1412 | |
5eb91c98 | 1413 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1414 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1415 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1416 | perror("ust command zmalloc"); |
5eb91c98 DG |
1417 | goto error; |
1418 | } | |
1d4b027a | 1419 | |
5eb91c98 DG |
1420 | /* |
1421 | * Using message-based transmissions to ensure we don't | |
1422 | * have to deal with partially received messages. | |
1423 | */ | |
1424 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1425 | sizeof(struct ust_register_msg)); | |
1426 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1427 | if (ret < 0) { | |
1428 | perror("lttcomm_recv_unix_sock register apps"); | |
1429 | } else { | |
1430 | ERR("Wrong size received on apps register"); | |
1431 | } | |
1432 | free(ust_cmd); | |
1433 | close(sock); | |
1434 | continue; | |
1435 | } | |
099e26bd | 1436 | |
5eb91c98 | 1437 | ust_cmd->sock = sock; |
099e26bd | 1438 | |
5eb91c98 DG |
1439 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1440 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1441 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1442 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1443 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1444 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1445 | |
5eb91c98 DG |
1446 | /* |
1447 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1448 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1449 | */ |
1450 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1451 | |
5eb91c98 DG |
1452 | /* |
1453 | * Wake the registration queue futex. Implicit memory | |
1454 | * barrier with the exchange in cds_wfq_enqueue. | |
1455 | */ | |
1456 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1457 | |
1458 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1459 | } |
1460 | } | |
90014c57 | 1461 | } |
1d4b027a DG |
1462 | } |
1463 | ||
1464 | error: | |
0fdd1e2c DG |
1465 | DBG("UST Registration thread dying"); |
1466 | ||
1467 | /* Notify that the registration thread is gone */ | |
1468 | notify_ust_apps(0); | |
1469 | ||
1470 | close(apps_sock); | |
1471 | close(sock); | |
273ea72c | 1472 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1473 | |
5eb91c98 DG |
1474 | lttng_poll_clean(&events); |
1475 | ||
1d4b027a DG |
1476 | return NULL; |
1477 | } | |
1478 | ||
8c0faa1d | 1479 | /* |
3bd1e081 | 1480 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1481 | * exec or it will fails. |
8c0faa1d | 1482 | */ |
3bd1e081 | 1483 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1484 | { |
1485 | int ret; | |
ee0b0061 DG |
1486 | struct timespec timeout; |
1487 | ||
1488 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1489 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1490 | |
1491 | /* Setup semaphore */ | |
3bd1e081 | 1492 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1493 | if (ret < 0) { |
3bd1e081 | 1494 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1495 | goto error; |
1496 | } | |
8c0faa1d | 1497 | |
3bd1e081 MD |
1498 | ret = pthread_create(&consumer_data->thread, NULL, |
1499 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1500 | if (ret != 0) { |
3bd1e081 | 1501 | PERROR("pthread_create consumer"); |
ee0b0061 | 1502 | ret = -1; |
8c0faa1d DG |
1503 | goto error; |
1504 | } | |
1505 | ||
ee0b0061 DG |
1506 | /* Get time for sem_timedwait absolute timeout */ |
1507 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1508 | if (ret < 0) { | |
3bd1e081 | 1509 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1510 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1511 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1512 | } else { |
1513 | /* Normal timeout if the gettime was successful */ | |
1514 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1515 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1516 | } |
8c0faa1d | 1517 | |
ee0b0061 DG |
1518 | if (ret < 0) { |
1519 | if (errno == ETIMEDOUT) { | |
1520 | /* | |
1521 | * Call has timed out so we kill the kconsumerd_thread and return | |
1522 | * an error. | |
1523 | */ | |
3bd1e081 MD |
1524 | ERR("The consumer thread was never ready. Killing it"); |
1525 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1526 | if (ret < 0) { |
3bd1e081 | 1527 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1528 | } |
1529 | } else { | |
3bd1e081 | 1530 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1531 | } |
1532 | goto error; | |
1533 | } | |
1534 | ||
3bd1e081 MD |
1535 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1536 | if (consumer_data->pid == 0) { | |
712ea556 | 1537 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1538 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1539 | goto error; |
1540 | } | |
3bd1e081 | 1541 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1542 | |
8c0faa1d DG |
1543 | return 0; |
1544 | ||
1545 | error: | |
1546 | return ret; | |
1547 | } | |
1548 | ||
d9800920 | 1549 | /* |
3bd1e081 | 1550 | * Join consumer thread |
d9800920 | 1551 | */ |
3bd1e081 | 1552 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1553 | { |
1554 | void *status; | |
1555 | int ret; | |
1556 | ||
3bd1e081 MD |
1557 | if (consumer_data->pid != 0) { |
1558 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1559 | if (ret) { |
3bd1e081 | 1560 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1561 | return ret; |
1562 | } | |
3bd1e081 | 1563 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1564 | } else { |
1565 | return 0; | |
1566 | } | |
1567 | } | |
1568 | ||
8c0faa1d | 1569 | /* |
3bd1e081 | 1570 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1571 | * |
d063d709 | 1572 | * Return pid if successful else -1. |
8c0faa1d | 1573 | */ |
3bd1e081 | 1574 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1575 | { |
1576 | int ret; | |
1577 | pid_t pid; | |
94c55f17 | 1578 | const char *consumer_to_use; |
53086306 | 1579 | const char *verbosity; |
94c55f17 | 1580 | struct stat st; |
8c0faa1d | 1581 | |
3bd1e081 | 1582 | DBG("Spawning consumerd"); |
c49dc785 | 1583 | |
8c0faa1d DG |
1584 | pid = fork(); |
1585 | if (pid == 0) { | |
1586 | /* | |
3bd1e081 | 1587 | * Exec consumerd. |
8c0faa1d | 1588 | */ |
daee5345 | 1589 | if (opt_verbose_consumer) { |
53086306 DG |
1590 | verbosity = "--verbose"; |
1591 | } else { | |
1592 | verbosity = "--quiet"; | |
1593 | } | |
3bd1e081 MD |
1594 | switch (consumer_data->type) { |
1595 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1596 | /* |
f806231f MD |
1597 | * Find out which consumerd to execute. We will |
1598 | * first try the 64-bit path, then the | |
1599 | * sessiond's installation directory, and | |
1600 | * fallback on the 32-bit one, | |
94c55f17 | 1601 | */ |
63a799e8 AM |
1602 | DBG3("Looking for a kernel consumer at these locations:"); |
1603 | DBG3(" 1) %s", consumerd64_bin); | |
1604 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1605 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1606 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1607 | DBG3("Found location #1"); |
94c55f17 | 1608 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1609 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1610 | DBG3("Found location #2"); |
94c55f17 | 1611 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1612 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1613 | DBG3("Found location #3"); |
eb1e0bd4 | 1614 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1615 | } else { |
63a799e8 | 1616 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1617 | break; |
1618 | } | |
1619 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1620 | execl(consumer_to_use, | |
1621 | "lttng-consumerd", verbosity, "-k", | |
1622 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1623 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1624 | NULL); | |
3bd1e081 | 1625 | break; |
7753dea8 MD |
1626 | case LTTNG_CONSUMER64_UST: |
1627 | { | |
b1e0b6b6 | 1628 | char *tmpnew = NULL; |
8f4905da MD |
1629 | |
1630 | if (consumerd64_libdir[0] != '\0') { | |
1631 | char *tmp; | |
1632 | size_t tmplen; | |
1633 | ||
1634 | tmp = getenv("LD_LIBRARY_PATH"); | |
1635 | if (!tmp) { | |
1636 | tmp = ""; | |
1637 | } | |
1638 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1639 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1640 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1641 | if (!tmpnew) { | |
1642 | ret = -ENOMEM; | |
1643 | goto error; | |
1644 | } | |
1645 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1646 | strcat(tmpnew, consumerd64_libdir); | |
1647 | if (tmp[0] != '\0') { | |
1648 | strcat(tmpnew, ":"); | |
1649 | strcat(tmpnew, tmp); | |
1650 | } | |
1651 | ret = putenv(tmpnew); | |
1652 | if (ret) { | |
1653 | ret = -errno; | |
1654 | goto error; | |
1655 | } | |
1656 | } | |
94c55f17 | 1657 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1658 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1659 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1660 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1661 | NULL); | |
8f4905da MD |
1662 | if (consumerd64_libdir[0] != '\0') { |
1663 | free(tmpnew); | |
1664 | } | |
1665 | if (ret) { | |
1666 | goto error; | |
1667 | } | |
3bd1e081 | 1668 | break; |
7753dea8 MD |
1669 | } |
1670 | case LTTNG_CONSUMER32_UST: | |
1671 | { | |
937dde8e | 1672 | char *tmpnew = NULL; |
8f4905da MD |
1673 | |
1674 | if (consumerd32_libdir[0] != '\0') { | |
1675 | char *tmp; | |
1676 | size_t tmplen; | |
1677 | ||
1678 | tmp = getenv("LD_LIBRARY_PATH"); | |
1679 | if (!tmp) { | |
1680 | tmp = ""; | |
1681 | } | |
1682 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1683 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1684 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1685 | if (!tmpnew) { | |
1686 | ret = -ENOMEM; | |
1687 | goto error; | |
1688 | } | |
1689 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1690 | strcat(tmpnew, consumerd32_libdir); | |
1691 | if (tmp[0] != '\0') { | |
1692 | strcat(tmpnew, ":"); | |
1693 | strcat(tmpnew, tmp); | |
1694 | } | |
1695 | ret = putenv(tmpnew); | |
1696 | if (ret) { | |
1697 | ret = -errno; | |
1698 | goto error; | |
1699 | } | |
1700 | } | |
94c55f17 | 1701 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1702 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1703 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1704 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1705 | NULL); | |
8f4905da MD |
1706 | if (consumerd32_libdir[0] != '\0') { |
1707 | free(tmpnew); | |
1708 | } | |
1709 | if (ret) { | |
1710 | goto error; | |
1711 | } | |
3bd1e081 | 1712 | break; |
7753dea8 | 1713 | } |
3bd1e081 MD |
1714 | default: |
1715 | perror("unknown consumer type"); | |
1716 | exit(EXIT_FAILURE); | |
1717 | } | |
8c0faa1d DG |
1718 | if (errno != 0) { |
1719 | perror("kernel start consumer exec"); | |
1720 | } | |
1721 | exit(EXIT_FAILURE); | |
1722 | } else if (pid > 0) { | |
1723 | ret = pid; | |
8c0faa1d | 1724 | } else { |
3bd1e081 | 1725 | perror("start consumer fork"); |
8c0faa1d | 1726 | ret = -errno; |
8c0faa1d | 1727 | } |
8f4905da | 1728 | error: |
8c0faa1d DG |
1729 | return ret; |
1730 | } | |
1731 | ||
693bd40b | 1732 | /* |
3bd1e081 | 1733 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1734 | */ |
3bd1e081 | 1735 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1736 | { |
1737 | int ret; | |
1738 | ||
3bd1e081 MD |
1739 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1740 | if (consumer_data->pid != 0) { | |
1741 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1742 | goto end; |
1743 | } | |
693bd40b | 1744 | |
3bd1e081 | 1745 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1746 | if (ret < 0) { |
3bd1e081 MD |
1747 | ERR("Spawning consumerd failed"); |
1748 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1749 | goto error; |
693bd40b | 1750 | } |
c49dc785 | 1751 | |
3bd1e081 MD |
1752 | /* Setting up the consumer_data pid */ |
1753 | consumer_data->pid = ret; | |
48842b30 | 1754 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1755 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1756 | |
3bd1e081 MD |
1757 | DBG2("Spawning consumer control thread"); |
1758 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1759 | if (ret < 0) { |
3bd1e081 | 1760 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1761 | goto error; |
1762 | } | |
1763 | ||
c49dc785 | 1764 | end: |
693bd40b DG |
1765 | return 0; |
1766 | ||
1767 | error: | |
1768 | return ret; | |
1769 | } | |
1770 | ||
b73401da | 1771 | /* |
d063d709 | 1772 | * modprobe_kernel_modules |
b73401da DG |
1773 | */ |
1774 | static int modprobe_kernel_modules(void) | |
1775 | { | |
ab147185 | 1776 | int ret = 0, i; |
b73401da DG |
1777 | char modprobe[256]; |
1778 | ||
ab147185 MD |
1779 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1780 | ret = snprintf(modprobe, sizeof(modprobe), | |
1781 | "/sbin/modprobe %s%s", | |
24b487b8 | 1782 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1783 | kernel_modules_list[i].name); |
b73401da DG |
1784 | if (ret < 0) { |
1785 | perror("snprintf modprobe"); | |
1786 | goto error; | |
1787 | } | |
ab147185 | 1788 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1789 | ret = system(modprobe); |
ab147185 MD |
1790 | if (ret == -1) { |
1791 | ERR("Unable to launch modprobe for module %s", | |
1792 | kernel_modules_list[i].name); | |
1793 | } else if (kernel_modules_list[i].required | |
d9800920 | 1794 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1795 | ERR("Unable to load module %s", |
1796 | kernel_modules_list[i].name); | |
1797 | } else { | |
1798 | DBG("Modprobe successfully %s", | |
1799 | kernel_modules_list[i].name); | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | error: | |
1804 | return ret; | |
1805 | } | |
1806 | ||
b73401da | 1807 | /* |
d063d709 | 1808 | * mount_debugfs |
b73401da DG |
1809 | */ |
1810 | static int mount_debugfs(char *path) | |
1811 | { | |
1812 | int ret; | |
1813 | char *type = "debugfs"; | |
1814 | ||
67f747d8 | 1815 | ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1816 | if (ret < 0) { |
7272acf5 | 1817 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1818 | goto error; |
1819 | } | |
1820 | ||
1821 | ret = mount(type, path, type, 0, NULL); | |
1822 | if (ret < 0) { | |
7272acf5 | 1823 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1824 | goto error; |
1825 | } | |
1826 | ||
1827 | DBG("Mounted debugfs successfully at %s", path); | |
1828 | ||
1829 | error: | |
1830 | return ret; | |
1831 | } | |
1832 | ||
8c0faa1d | 1833 | /* |
d063d709 | 1834 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1835 | */ |
f3ed775e | 1836 | static void init_kernel_tracer(void) |
8c0faa1d | 1837 | { |
b73401da DG |
1838 | int ret; |
1839 | char *proc_mounts = "/proc/mounts"; | |
1840 | char line[256]; | |
684d34d2 | 1841 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1842 | FILE *fp; |
1843 | ||
1844 | /* Detect debugfs */ | |
1845 | fp = fopen(proc_mounts, "r"); | |
1846 | if (fp == NULL) { | |
1847 | ERR("Unable to probe %s", proc_mounts); | |
1848 | goto error; | |
1849 | } | |
1850 | ||
1851 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1852 | if (strstr(line, "debugfs") != NULL) { | |
1853 | /* Remove first string */ | |
1854 | strtok(line, " "); | |
1855 | /* Dup string here so we can reuse line later on */ | |
1856 | debugfs_path = strdup(strtok(NULL, " ")); | |
1857 | DBG("Got debugfs path : %s", debugfs_path); | |
1858 | break; | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | fclose(fp); | |
1863 | ||
1864 | /* Mount debugfs if needded */ | |
1865 | if (debugfs_path == NULL) { | |
1866 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1867 | if (ret < 0) { | |
1868 | perror("asprintf debugfs path"); | |
1869 | goto error; | |
1870 | } | |
1871 | ret = mount_debugfs(debugfs_path); | |
1872 | if (ret < 0) { | |
7272acf5 | 1873 | perror("Cannot mount debugfs"); |
b73401da DG |
1874 | goto error; |
1875 | } | |
1876 | } | |
1877 | ||
1878 | /* Modprobe lttng kernel modules */ | |
1879 | ret = modprobe_kernel_modules(); | |
1880 | if (ret < 0) { | |
1881 | goto error; | |
1882 | } | |
1883 | ||
1884 | /* Setup lttng kernel path */ | |
1885 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1886 | if (ret < 0) { | |
1887 | perror("asprintf lttng path"); | |
1888 | goto error; | |
1889 | } | |
1890 | ||
1891 | /* Open debugfs lttng */ | |
1892 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1893 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1894 | DBG("Failed to open %s", lttng_path); |
1895 | goto error; | |
8c0faa1d DG |
1896 | } |
1897 | ||
b73401da DG |
1898 | free(lttng_path); |
1899 | free(debugfs_path); | |
f3ed775e | 1900 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1901 | return; |
1902 | ||
1903 | error: | |
1904 | if (lttng_path) { | |
1905 | free(lttng_path); | |
1906 | } | |
1907 | if (debugfs_path) { | |
1908 | free(debugfs_path); | |
1909 | } | |
1910 | WARN("No kernel tracer available"); | |
1911 | kernel_tracer_fd = 0; | |
1912 | return; | |
f3ed775e | 1913 | } |
33a2b854 | 1914 | |
f3ed775e | 1915 | /* |
54d01ffb | 1916 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1917 | */ |
54d01ffb | 1918 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1919 | { |
f40799e8 | 1920 | int ret = 0; |
8c0faa1d | 1921 | |
3bd1e081 | 1922 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1923 | /* |
54d01ffb DG |
1924 | * Assign default kernel consumer socket if no consumer assigned to the |
1925 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1926 | * an extra security check. | |
d9800920 DG |
1927 | */ |
1928 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1929 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1930 | } |
1931 | ||
2bdd86d4 | 1932 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1933 | if (ret < 0) { |
f3ed775e DG |
1934 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1935 | goto error; | |
1936 | } | |
1d4b027a | 1937 | |
3bd1e081 | 1938 | session->consumer_fds_sent = 1; |
f3ed775e | 1939 | } |
1d4b027a DG |
1940 | |
1941 | error: | |
1942 | return ret; | |
8c0faa1d DG |
1943 | } |
1944 | ||
0177d773 DG |
1945 | /* |
1946 | * Create an UST session and add it to the session ust list. | |
1947 | */ | |
44d3bd01 DG |
1948 | static int create_ust_session(struct ltt_session *session, |
1949 | struct lttng_domain *domain) | |
0177d773 | 1950 | { |
13384287 | 1951 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1952 | int ret; |
44d3bd01 DG |
1953 | |
1954 | switch (domain->type) { | |
48842b30 | 1955 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1956 | break; |
1957 | default: | |
13384287 | 1958 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1959 | goto error; |
1960 | } | |
0177d773 DG |
1961 | |
1962 | DBG("Creating UST session"); | |
1963 | ||
a991f516 | 1964 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1965 | if (lus == NULL) { |
44d3bd01 | 1966 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1967 | goto error; |
1968 | } | |
1969 | ||
67f747d8 | 1970 | ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1971 | session->uid, session->gid); |
0177d773 DG |
1972 | if (ret < 0) { |
1973 | if (ret != -EEXIST) { | |
1974 | ERR("Trace directory creation error"); | |
44d3bd01 | 1975 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1976 | goto error; |
1977 | } | |
1978 | } | |
1979 | ||
f6a9efaa DG |
1980 | /* The domain type dictate different actions on session creation */ |
1981 | switch (domain->type) { | |
48842b30 DG |
1982 | case LTTNG_DOMAIN_UST: |
1983 | /* No ustctl for the global UST domain */ | |
1984 | break; | |
1985 | default: | |
36dc12cc | 1986 | ERR("Unknown UST domain on create session %d", domain->type); |
0177d773 DG |
1987 | goto error; |
1988 | } | |
6df2e2c9 MD |
1989 | lus->uid = session->uid; |
1990 | lus->gid = session->gid; | |
f6a9efaa | 1991 | session->ust_session = lus; |
44d3bd01 DG |
1992 | |
1993 | return LTTCOMM_OK; | |
0177d773 DG |
1994 | |
1995 | error: | |
1996 | free(lus); | |
1997 | return ret; | |
1998 | } | |
1999 | ||
333f285e | 2000 | /* |
d063d709 | 2001 | * Create a kernel tracer session then create the default channel. |
333f285e | 2002 | */ |
f3ed775e | 2003 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2004 | { |
f3ed775e | 2005 | int ret; |
f3ed775e DG |
2006 | |
2007 | DBG("Creating kernel session"); | |
2008 | ||
2009 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2010 | if (ret < 0) { | |
2011 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2012 | goto error; | |
333f285e DG |
2013 | } |
2014 | ||
d9800920 | 2015 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
2016 | if (kconsumer_data.cmd_sock) { |
2017 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
2018 | } |
2019 | ||
67f747d8 | 2020 | ret = mkdir_recursive_run_as(session->kernel_session->trace_path, |
6df2e2c9 | 2021 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2022 | if (ret < 0) { |
996b65c8 | 2023 | if (ret != -EEXIST) { |
7a485870 DG |
2024 | ERR("Trace directory creation error"); |
2025 | goto error; | |
2026 | } | |
2027 | } | |
6df2e2c9 MD |
2028 | session->kernel_session->uid = session->uid; |
2029 | session->kernel_session->gid = session->gid; | |
7a485870 | 2030 | |
f3ed775e DG |
2031 | error: |
2032 | return ret; | |
333f285e DG |
2033 | } |
2034 | ||
8e0af1b4 MD |
2035 | /* |
2036 | * Check if the UID or GID match the session. Root user has access to | |
2037 | * all sessions. | |
2038 | */ | |
2039 | static int session_access_ok(struct ltt_session *session, | |
2040 | uid_t uid, gid_t gid) | |
2041 | { | |
2042 | if (uid != session->uid && gid != session->gid | |
2043 | && uid != 0) { | |
2044 | return 0; | |
2045 | } else { | |
2046 | return 1; | |
2047 | } | |
2048 | } | |
2049 | ||
2050 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2051 | { | |
2052 | unsigned int i = 0; | |
2053 | struct ltt_session *session; | |
2054 | ||
2055 | DBG("Counting number of available session for UID %d GID %d", | |
2056 | uid, gid); | |
2057 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2058 | /* | |
2059 | * Only list the sessions the user can control. | |
2060 | */ | |
2061 | if (!session_access_ok(session, uid, gid)) { | |
2062 | continue; | |
2063 | } | |
2064 | i++; | |
2065 | } | |
2066 | return i; | |
2067 | } | |
2068 | ||
6c9cc2ab DG |
2069 | /* |
2070 | * Using the session list, filled a lttng_session array to send back to the | |
2071 | * client for session listing. | |
2072 | * | |
2073 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2074 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2075 | */ |
8e0af1b4 MD |
2076 | static void list_lttng_sessions(struct lttng_session *sessions, |
2077 | uid_t uid, gid_t gid) | |
6c9cc2ab | 2078 | { |
8e0af1b4 | 2079 | unsigned int i = 0; |
6c9cc2ab DG |
2080 | struct ltt_session *session; |
2081 | ||
8e0af1b4 MD |
2082 | DBG("Getting all available session for UID %d GID %d", |
2083 | uid, gid); | |
6c9cc2ab DG |
2084 | /* |
2085 | * Iterate over session list and append data after the control struct in | |
2086 | * the buffer. | |
2087 | */ | |
2088 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2089 | /* |
2090 | * Only list the sessions the user can control. | |
2091 | */ | |
2092 | if (!session_access_ok(session, uid, gid)) { | |
2093 | continue; | |
2094 | } | |
6c9cc2ab | 2095 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2096 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2097 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2098 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2099 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2100 | i++; |
2101 | } | |
2102 | } | |
2103 | ||
9f19cc17 DG |
2104 | /* |
2105 | * Fill lttng_channel array of all channels. | |
2106 | */ | |
b551a063 | 2107 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2108 | struct lttng_channel *channels) |
2109 | { | |
2110 | int i = 0; | |
2111 | struct ltt_kernel_channel *kchan; | |
2112 | ||
2113 | DBG("Listing channels for session %s", session->name); | |
2114 | ||
b551a063 DG |
2115 | switch (domain) { |
2116 | case LTTNG_DOMAIN_KERNEL: | |
2117 | /* Kernel channels */ | |
2118 | if (session->kernel_session != NULL) { | |
2119 | cds_list_for_each_entry(kchan, | |
2120 | &session->kernel_session->channel_list.head, list) { | |
2121 | /* Copy lttng_channel struct to array */ | |
2122 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2123 | channels[i].enabled = kchan->enabled; | |
2124 | i++; | |
2125 | } | |
2126 | } | |
2127 | break; | |
2128 | case LTTNG_DOMAIN_UST: | |
2129 | { | |
bec39940 | 2130 | struct lttng_ht_iter iter; |
b551a063 DG |
2131 | struct ltt_ust_channel *uchan; |
2132 | ||
bec39940 DG |
2133 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2134 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2135 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2136 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2137 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2138 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2139 | channels[i].attr.switch_timer_interval = | |
2140 | uchan->attr.switch_timer_interval; | |
2141 | channels[i].attr.read_timer_interval = | |
2142 | uchan->attr.read_timer_interval; | |
aea829b3 | 2143 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2144 | switch (uchan->attr.output) { |
2145 | case LTTNG_UST_MMAP: | |
2146 | default: | |
2147 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2148 | break; | |
2149 | } | |
9f19cc17 DG |
2150 | i++; |
2151 | } | |
b551a063 DG |
2152 | break; |
2153 | } | |
2154 | default: | |
2155 | break; | |
9f19cc17 | 2156 | } |
b551a063 | 2157 | } |
9f19cc17 | 2158 | |
b551a063 DG |
2159 | /* |
2160 | * Create a list of ust global domain events. | |
2161 | */ | |
2162 | static int list_lttng_ust_global_events(char *channel_name, | |
2163 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2164 | { | |
2165 | int i = 0, ret = 0; | |
2166 | unsigned int nb_event = 0; | |
bec39940 DG |
2167 | struct lttng_ht_iter iter; |
2168 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2169 | struct ltt_ust_channel *uchan; |
2170 | struct ltt_ust_event *uevent; | |
2171 | struct lttng_event *tmp; | |
2172 | ||
2173 | DBG("Listing UST global events for channel %s", channel_name); | |
2174 | ||
2175 | rcu_read_lock(); | |
2176 | ||
bec39940 DG |
2177 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2178 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2179 | if (node == NULL) { |
2180 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2181 | goto error; | |
b551a063 DG |
2182 | } |
2183 | ||
bec39940 | 2184 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2185 | |
bec39940 | 2186 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2187 | |
b551a063 DG |
2188 | if (nb_event == 0) { |
2189 | ret = nb_event; | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | DBG3("Listing UST global %d events", nb_event); | |
2194 | ||
2195 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2196 | if (tmp == NULL) { | |
2197 | ret = -LTTCOMM_FATAL; | |
2198 | goto error; | |
2199 | } | |
2200 | ||
bec39940 | 2201 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2202 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2203 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2204 | tmp[i].enabled = uevent->enabled; | |
2205 | switch (uevent->attr.instrumentation) { | |
2206 | case LTTNG_UST_TRACEPOINT: | |
2207 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2208 | break; | |
2209 | case LTTNG_UST_PROBE: | |
2210 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2211 | break; | |
2212 | case LTTNG_UST_FUNCTION: | |
2213 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2214 | break; | |
ac3bd9c0 | 2215 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2216 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2217 | break; |
9f19cc17 | 2218 | } |
d7b75b30 | 2219 | i++; |
9f19cc17 DG |
2220 | } |
2221 | ||
b551a063 DG |
2222 | ret = nb_event; |
2223 | *events = tmp; | |
2224 | ||
2225 | error: | |
2226 | rcu_read_unlock(); | |
2227 | return ret; | |
9f19cc17 DG |
2228 | } |
2229 | ||
2230 | /* | |
b551a063 | 2231 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2232 | */ |
b551a063 DG |
2233 | static int list_lttng_kernel_events(char *channel_name, |
2234 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2235 | { |
b551a063 DG |
2236 | int i = 0, ret; |
2237 | unsigned int nb_event; | |
9f19cc17 | 2238 | struct ltt_kernel_event *event; |
b551a063 DG |
2239 | struct ltt_kernel_channel *kchan; |
2240 | ||
2241 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2242 | if (kchan == NULL) { | |
2243 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2244 | goto error; | |
2245 | } | |
2246 | ||
2247 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2248 | |
2249 | DBG("Listing events for channel %s", kchan->channel->name); | |
2250 | ||
b551a063 DG |
2251 | if (nb_event == 0) { |
2252 | ret = nb_event; | |
2253 | goto error; | |
2254 | } | |
2255 | ||
2256 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2257 | if (*events == NULL) { | |
2258 | ret = LTTCOMM_FATAL; | |
2259 | goto error; | |
2260 | } | |
2261 | ||
9f19cc17 DG |
2262 | /* Kernel channels */ |
2263 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2264 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2265 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2266 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2267 | switch (event->event->instrumentation) { |
2268 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2269 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2270 | break; |
2271 | case LTTNG_KERNEL_KPROBE: | |
2272 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2273 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2274 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2275 | sizeof(struct lttng_kernel_kprobe)); |
2276 | break; | |
2277 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2278 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2279 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2280 | sizeof(struct lttng_kernel_function)); |
2281 | break; | |
0133c199 | 2282 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2283 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2284 | break; |
a54bd42d | 2285 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2286 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2287 | break; |
7a3d1328 MD |
2288 | case LTTNG_KERNEL_ALL: |
2289 | assert(0); | |
2290 | break; | |
9f19cc17 DG |
2291 | } |
2292 | i++; | |
2293 | } | |
b551a063 DG |
2294 | |
2295 | return nb_event; | |
2296 | ||
2297 | error: | |
2298 | return ret; | |
9f19cc17 DG |
2299 | } |
2300 | ||
fac6795d | 2301 | /* |
54d01ffb | 2302 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2303 | */ |
54d01ffb DG |
2304 | static int cmd_disable_channel(struct ltt_session *session, |
2305 | int domain, char *channel_name) | |
fac6795d | 2306 | { |
54d01ffb | 2307 | int ret; |
78f0bacd DG |
2308 | struct ltt_ust_session *usess; |
2309 | ||
2310 | usess = session->ust_session; | |
379473d2 | 2311 | |
54d01ffb | 2312 | switch (domain) { |
78f0bacd DG |
2313 | case LTTNG_DOMAIN_KERNEL: |
2314 | { | |
2315 | ret = channel_kernel_disable(session->kernel_session, | |
2316 | channel_name); | |
2317 | if (ret != LTTCOMM_OK) { | |
2318 | goto error; | |
2319 | } | |
54d01ffb | 2320 | |
78f0bacd DG |
2321 | kernel_wait_quiescent(kernel_tracer_fd); |
2322 | break; | |
2323 | } | |
2324 | case LTTNG_DOMAIN_UST: | |
2325 | { | |
2326 | struct ltt_ust_channel *uchan; | |
bec39940 | 2327 | struct lttng_ht *chan_ht; |
78f0bacd | 2328 | |
7885e399 DG |
2329 | chan_ht = usess->domain_global.channels; |
2330 | ||
2331 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2332 | if (uchan == NULL) { |
2333 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2334 | goto error; |
78f0bacd DG |
2335 | } |
2336 | ||
7885e399 DG |
2337 | ret = channel_ust_disable(usess, domain, uchan); |
2338 | if (ret != LTTCOMM_OK) { | |
54d01ffb | 2339 | goto error; |
78f0bacd | 2340 | } |
78f0bacd DG |
2341 | break; |
2342 | } | |
2343 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2344 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2345 | case LTTNG_DOMAIN_UST_PID: | |
2346 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2347 | goto error; | |
2348 | default: | |
2349 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2350 | goto error; | |
20fe2104 DG |
2351 | } |
2352 | ||
54d01ffb | 2353 | ret = LTTCOMM_OK; |
d65106b1 | 2354 | |
54d01ffb DG |
2355 | error: |
2356 | return ret; | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2361 | */ | |
44d3bd01 | 2362 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2363 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2364 | { |
2365 | int ret; | |
f6a9efaa | 2366 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2367 | struct lttng_ht *chan_ht; |
f6a9efaa | 2368 | |
5d56b5aa | 2369 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2370 | |
aea829b3 | 2371 | switch (domain) { |
44d3bd01 DG |
2372 | case LTTNG_DOMAIN_KERNEL: |
2373 | { | |
2374 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2375 | |
44d3bd01 DG |
2376 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2377 | session->kernel_session); | |
2378 | if (kchan == NULL) { | |
2379 | ret = channel_kernel_create(session->kernel_session, | |
2380 | attr, kernel_poll_pipe[1]); | |
2381 | } else { | |
2382 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2383 | } | |
2384 | ||
2385 | if (ret != LTTCOMM_OK) { | |
2386 | goto error; | |
2387 | } | |
2388 | ||
2389 | kernel_wait_quiescent(kernel_tracer_fd); | |
2390 | break; | |
2391 | } | |
f6a9efaa DG |
2392 | case LTTNG_DOMAIN_UST: |
2393 | { | |
2394 | struct ltt_ust_channel *uchan; | |
2395 | ||
7885e399 | 2396 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2397 | |
7885e399 | 2398 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2399 | if (uchan == NULL) { |
7885e399 | 2400 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2401 | } else { |
7885e399 | 2402 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2403 | } |
f6a9efaa DG |
2404 | break; |
2405 | } | |
78f0bacd DG |
2406 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2407 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2408 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2409 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2410 | goto error; | |
44d3bd01 DG |
2411 | default: |
2412 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2413 | goto error; | |
54d01ffb DG |
2414 | } |
2415 | ||
54d01ffb DG |
2416 | error: |
2417 | return ret; | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2422 | */ | |
2423 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2424 | char *channel_name, char *event_name) | |
2425 | { | |
2426 | int ret; | |
54d01ffb DG |
2427 | |
2428 | switch (domain) { | |
2429 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2430 | { |
2431 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2432 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2433 | |
b0a40d28 DG |
2434 | ksess = session->kernel_session; |
2435 | ||
2436 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2437 | if (kchan == NULL) { |
2438 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2439 | goto error; | |
d65106b1 DG |
2440 | } |
2441 | ||
b0a40d28 | 2442 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2443 | if (ret != LTTCOMM_OK) { |
2444 | goto error; | |
2445 | } | |
2446 | ||
2447 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2448 | break; |
2bdd86d4 MD |
2449 | } |
2450 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2451 | { |
b0a40d28 | 2452 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2453 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2454 | |
2455 | usess = session->ust_session; | |
2456 | ||
2457 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2458 | channel_name); | |
2459 | if (uchan == NULL) { | |
2460 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2461 | goto error; | |
2462 | } | |
2463 | ||
7f79d3a1 DG |
2464 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2465 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2466 | goto error; |
2467 | } | |
2468 | ||
7f79d3a1 | 2469 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2470 | channel_name); |
b0a40d28 DG |
2471 | break; |
2472 | } | |
2bdd86d4 MD |
2473 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2474 | case LTTNG_DOMAIN_UST_PID: | |
2475 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2476 | default: |
54d01ffb DG |
2477 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2478 | goto error; | |
d65106b1 | 2479 | } |
26cc6b4e | 2480 | |
54d01ffb DG |
2481 | ret = LTTCOMM_OK; |
2482 | ||
2483 | error: | |
2484 | return ret; | |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2489 | */ | |
2490 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2491 | char *channel_name) | |
2492 | { | |
2493 | int ret; | |
54d01ffb DG |
2494 | |
2495 | switch (domain) { | |
2496 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2497 | { |
2498 | struct ltt_kernel_session *ksess; | |
2499 | struct ltt_kernel_channel *kchan; | |
2500 | ||
2501 | ksess = session->kernel_session; | |
2502 | ||
2503 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2504 | if (kchan == NULL) { |
2505 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2506 | goto error; | |
26cc6b4e DG |
2507 | } |
2508 | ||
9730260e | 2509 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2510 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2511 | goto error; |
26cc6b4e DG |
2512 | } |
2513 | ||
54d01ffb | 2514 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2515 | break; |
9730260e DG |
2516 | } |
2517 | case LTTNG_DOMAIN_UST: | |
2518 | { | |
2519 | struct ltt_ust_session *usess; | |
2520 | struct ltt_ust_channel *uchan; | |
2521 | ||
2522 | usess = session->ust_session; | |
2523 | ||
2524 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2525 | channel_name); | |
2526 | if (uchan == NULL) { | |
2527 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2528 | goto error; | |
2529 | } | |
2530 | ||
7f79d3a1 DG |
2531 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2532 | if (ret != 0) { | |
9730260e DG |
2533 | goto error; |
2534 | } | |
2535 | ||
7f79d3a1 | 2536 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2537 | |
2538 | break; | |
2539 | } | |
2540 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2541 | case LTTNG_DOMAIN_UST_PID: | |
2542 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2543 | default: |
54d01ffb DG |
2544 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2545 | goto error; | |
26cc6b4e | 2546 | } |
e953ef25 | 2547 | |
54d01ffb | 2548 | ret = LTTCOMM_OK; |
e953ef25 | 2549 | |
54d01ffb DG |
2550 | error: |
2551 | return ret; | |
2552 | } | |
f5177a38 | 2553 | |
54d01ffb DG |
2554 | /* |
2555 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2556 | */ | |
2557 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2558 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2559 | { | |
2560 | int ret; | |
f5177a38 | 2561 | |
54d01ffb DG |
2562 | switch (domain) { |
2563 | case LTTNG_DOMAIN_KERNEL: | |
2564 | /* Add kernel context to kernel tracer */ | |
2565 | ret = context_kernel_add(session->kernel_session, ctx, | |
2566 | event_name, channel_name); | |
2567 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2568 | goto error; |
e953ef25 | 2569 | } |
2bdd86d4 MD |
2570 | break; |
2571 | case LTTNG_DOMAIN_UST: | |
2572 | { | |
55cc08a6 | 2573 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2574 | |
55cc08a6 DG |
2575 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2576 | if (ret != LTTCOMM_OK) { | |
2577 | goto error; | |
2bdd86d4 | 2578 | } |
e953ef25 | 2579 | break; |
2bdd86d4 | 2580 | } |
55cc08a6 DG |
2581 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2582 | case LTTNG_DOMAIN_UST_PID: | |
2583 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2584 | default: |
54d01ffb DG |
2585 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2586 | goto error; | |
e953ef25 | 2587 | } |
950131af | 2588 | |
54d01ffb | 2589 | ret = LTTCOMM_OK; |
950131af | 2590 | |
54d01ffb DG |
2591 | error: |
2592 | return ret; | |
2593 | } | |
2594 | ||
2595 | /* | |
2596 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2597 | * |
2598 | * TODO: currently, both events and loglevels are kept within the same | |
2599 | * namespace for UST global registry/app registery, so if an event | |
2600 | * happen to have the same name as the loglevel (very unlikely though), | |
2601 | * and an attempt is made to enable/disable both in the same session, | |
2602 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2603 | */ |
2604 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2605 | char *channel_name, struct lttng_event *event) | |
2606 | { | |
2607 | int ret; | |
f6cd6b0f | 2608 | struct lttng_channel *attr; |
48842b30 | 2609 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2610 | |
2611 | switch (domain) { | |
2612 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2613 | { |
2614 | struct ltt_kernel_channel *kchan; | |
2615 | ||
54d01ffb DG |
2616 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2617 | session->kernel_session); | |
2618 | if (kchan == NULL) { | |
f6cd6b0f DG |
2619 | attr = channel_new_default_attr(domain); |
2620 | if (attr == NULL) { | |
2621 | ret = LTTCOMM_FATAL; | |
2622 | goto error; | |
2623 | } | |
2624 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2625 | ||
54d01ffb | 2626 | /* This call will notify the kernel thread */ |
44d3bd01 | 2627 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2628 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2629 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2630 | free(attr); |
f5177a38 DG |
2631 | goto error; |
2632 | } | |
ff4d74e6 | 2633 | free(attr); |
54d01ffb | 2634 | } |
950131af | 2635 | |
54d01ffb DG |
2636 | /* Get the newly created kernel channel pointer */ |
2637 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2638 | session->kernel_session); | |
2639 | if (kchan == NULL) { | |
2640 | /* This sould not happen... */ | |
2641 | ret = LTTCOMM_FATAL; | |
2642 | goto error; | |
2643 | } | |
f5177a38 | 2644 | |
48842b30 DG |
2645 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2646 | event); | |
54d01ffb | 2647 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2648 | goto error; |
950131af DG |
2649 | } |
2650 | ||
54d01ffb | 2651 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2652 | break; |
2bdd86d4 MD |
2653 | } |
2654 | case LTTNG_DOMAIN_UST: | |
2655 | { | |
aea829b3 | 2656 | struct lttng_channel *attr; |
48842b30 | 2657 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2658 | |
edb67388 | 2659 | /* Get channel from global UST domain */ |
48842b30 DG |
2660 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2661 | channel_name); | |
2662 | if (uchan == NULL) { | |
aea829b3 DG |
2663 | /* Create default channel */ |
2664 | attr = channel_new_default_attr(domain); | |
2665 | if (attr == NULL) { | |
2666 | ret = LTTCOMM_FATAL; | |
2667 | goto error; | |
2668 | } | |
596219f7 | 2669 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2670 | attr->name[NAME_MAX - 1] = '\0'; |
2bdd86d4 | 2671 | |
7885e399 | 2672 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2673 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2674 | free(attr); |
aea829b3 DG |
2675 | goto error; |
2676 | } | |
aea829b3 DG |
2677 | free(attr); |
2678 | ||
2679 | /* Get the newly created channel reference back */ | |
2680 | uchan = trace_ust_find_channel_by_name( | |
2681 | usess->domain_global.channels, channel_name); | |
2682 | if (uchan == NULL) { | |
2683 | /* Something is really wrong */ | |
2bdd86d4 MD |
2684 | ret = LTTCOMM_FATAL; |
2685 | goto error; | |
2686 | } | |
48842b30 | 2687 | } |
2bdd86d4 | 2688 | |
edb67388 | 2689 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2690 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2691 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2692 | goto error; |
2bdd86d4 MD |
2693 | } |
2694 | break; | |
2695 | } | |
2696 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2697 | case LTTNG_DOMAIN_UST_PID: | |
2698 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2699 | default: |
54d01ffb DG |
2700 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2701 | goto error; | |
950131af | 2702 | } |
d36b8583 | 2703 | |
54d01ffb | 2704 | ret = LTTCOMM_OK; |
d36b8583 | 2705 | |
54d01ffb DG |
2706 | error: |
2707 | return ret; | |
2708 | } | |
7d29a247 | 2709 | |
54d01ffb DG |
2710 | /* |
2711 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2712 | */ | |
2713 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2714 | char *channel_name, int event_type) |
54d01ffb DG |
2715 | { |
2716 | int ret; | |
2717 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2718 | |
54d01ffb DG |
2719 | switch (domain) { |
2720 | case LTTNG_DOMAIN_KERNEL: | |
2721 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2722 | session->kernel_session); | |
2723 | if (kchan == NULL) { | |
2724 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2725 | ret = channel_kernel_create(session->kernel_session, NULL, |
2726 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2727 | if (ret != LTTCOMM_OK) { |
2728 | goto error; | |
d36b8583 | 2729 | } |
0d0c377a | 2730 | |
8f69e5eb DG |
2731 | /* Get the newly created kernel channel pointer */ |
2732 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2733 | session->kernel_session); | |
2734 | if (kchan == NULL) { | |
2735 | /* This sould not happen... */ | |
2736 | ret = LTTCOMM_FATAL; | |
2737 | goto error; | |
2738 | } | |
2739 | ||
54d01ffb | 2740 | } |
0fdd1e2c | 2741 | |
7a3d1328 | 2742 | switch (event_type) { |
76d45b40 | 2743 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2744 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2745 | kchan, kernel_tracer_fd); |
7a3d1328 | 2746 | break; |
76d45b40 | 2747 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2748 | /* |
7a3d1328 MD |
2749 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2750 | * events already registered to the channel. | |
8c9ae521 | 2751 | */ |
7a3d1328 MD |
2752 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2753 | kchan, kernel_tracer_fd); | |
2754 | break; | |
76d45b40 | 2755 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2756 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2757 | ret = event_kernel_enable_all(session->kernel_session, |
2758 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2759 | break; |
2760 | default: | |
2761 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2762 | goto error; | |
8c9ae521 | 2763 | } |
8f69e5eb DG |
2764 | |
2765 | /* Manage return value */ | |
54d01ffb | 2766 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2767 | goto error; |
d36b8583 DG |
2768 | } |
2769 | ||
54d01ffb | 2770 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2771 | break; |
76d45b40 DG |
2772 | case LTTNG_DOMAIN_UST: |
2773 | { | |
2774 | struct lttng_channel *attr; | |
2775 | struct ltt_ust_channel *uchan; | |
2776 | struct ltt_ust_session *usess = session->ust_session; | |
2777 | ||
2778 | /* Get channel from global UST domain */ | |
2779 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2780 | channel_name); | |
2781 | if (uchan == NULL) { | |
2782 | /* Create default channel */ | |
2783 | attr = channel_new_default_attr(domain); | |
2784 | if (attr == NULL) { | |
2785 | ret = LTTCOMM_FATAL; | |
2786 | goto error; | |
2787 | } | |
2788 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2789 | attr->name[NAME_MAX - 1] = '\0'; | |
2790 | ||
2791 | /* Use the internal command enable channel */ | |
7885e399 | 2792 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2793 | if (ret != LTTCOMM_OK) { |
2794 | free(attr); | |
2795 | goto error; | |
2796 | } | |
2797 | free(attr); | |
2798 | ||
2799 | /* Get the newly created channel reference back */ | |
2800 | uchan = trace_ust_find_channel_by_name( | |
2801 | usess->domain_global.channels, channel_name); | |
2802 | if (uchan == NULL) { | |
2803 | /* Something is really wrong */ | |
2804 | ret = LTTCOMM_FATAL; | |
2805 | goto error; | |
2806 | } | |
2807 | } | |
2808 | ||
2809 | /* At this point, the session and channel exist on the tracer */ | |
2810 | ||
2811 | switch (event_type) { | |
2812 | case LTTNG_EVENT_ALL: | |
2813 | case LTTNG_EVENT_TRACEPOINT: | |
2814 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2815 | if (ret != LTTCOMM_OK) { | |
2816 | goto error; | |
2817 | } | |
2818 | break; | |
2819 | default: | |
2820 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2821 | goto error; | |
2822 | } | |
2823 | ||
2824 | /* Manage return value */ | |
2825 | if (ret != LTTCOMM_OK) { | |
2826 | goto error; | |
2827 | } | |
2828 | ||
2829 | break; | |
2830 | } | |
2831 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2832 | case LTTNG_DOMAIN_UST_PID: | |
2833 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2834 | default: |
54d01ffb DG |
2835 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2836 | goto error; | |
d36b8583 | 2837 | } |
f3ed775e | 2838 | |
54d01ffb DG |
2839 | ret = LTTCOMM_OK; |
2840 | ||
2841 | error: | |
2842 | return ret; | |
2843 | } | |
2844 | ||
2845 | /* | |
2846 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2847 | */ | |
2848 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2849 | { | |
2850 | int ret; | |
2851 | ssize_t nb_events = 0; | |
2852 | ||
2853 | switch (domain) { | |
2854 | case LTTNG_DOMAIN_KERNEL: | |
2855 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2856 | if (nb_events < 0) { | |
2857 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2858 | goto error; | |
894be886 | 2859 | } |
54d01ffb | 2860 | break; |
b551a063 DG |
2861 | case LTTNG_DOMAIN_UST: |
2862 | nb_events = ust_app_list_events(events); | |
2863 | if (nb_events < 0) { | |
2864 | ret = LTTCOMM_UST_LIST_FAIL; | |
2865 | goto error; | |
2866 | } | |
2867 | break; | |
54d01ffb | 2868 | default: |
54d01ffb DG |
2869 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2870 | goto error; | |
2871 | } | |
894be886 | 2872 | |
54d01ffb | 2873 | return nb_events; |
7d29a247 | 2874 | |
54d01ffb DG |
2875 | error: |
2876 | /* Return negative value to differentiate return code */ | |
2877 | return -ret; | |
2878 | } | |
b389abbe | 2879 | |
54d01ffb DG |
2880 | /* |
2881 | * Command LTTNG_START_TRACE processed by the client thread. | |
2882 | */ | |
2883 | static int cmd_start_trace(struct ltt_session *session) | |
2884 | { | |
2885 | int ret; | |
54d01ffb | 2886 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2887 | struct ltt_ust_session *usess; |
b389abbe | 2888 | |
54d01ffb DG |
2889 | /* Short cut */ |
2890 | ksession = session->kernel_session; | |
b9d9b220 | 2891 | usess = session->ust_session; |
5eb91c98 | 2892 | |
b9ef1c83 DG |
2893 | if (session->enabled) { |
2894 | ret = LTTCOMM_UST_START_FAIL; | |
2895 | goto error; | |
2896 | } | |
2897 | ||
464dd62d | 2898 | session->enabled = 1; |
5eb91c98 | 2899 | |
54d01ffb DG |
2900 | /* Kernel tracing */ |
2901 | if (ksession != NULL) { | |
2bdd86d4 MD |
2902 | struct ltt_kernel_channel *kchan; |
2903 | ||
54d01ffb DG |
2904 | /* Open kernel metadata */ |
2905 | if (ksession->metadata == NULL) { | |
2906 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2907 | if (ret < 0) { | |
2908 | ret = LTTCOMM_KERN_META_FAIL; | |
2909 | goto error; | |
b389abbe | 2910 | } |
54d01ffb | 2911 | } |
7d29a247 | 2912 | |
54d01ffb DG |
2913 | /* Open kernel metadata stream */ |
2914 | if (ksession->metadata_stream_fd == 0) { | |
2915 | ret = kernel_open_metadata_stream(ksession); | |
2916 | if (ret < 0) { | |
2917 | ERR("Kernel create metadata stream failed"); | |
2918 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2919 | goto error; | |
2920 | } | |
2921 | } | |
2922 | ||
2923 | /* For each channel */ | |
2924 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2925 | if (kchan->stream_count == 0) { | |
2926 | ret = kernel_open_channel_stream(kchan); | |
2927 | if (ret < 0) { | |
2928 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2929 | goto error; |
2930 | } | |
54d01ffb DG |
2931 | /* Update the stream global counter */ |
2932 | ksession->stream_count_global += ret; | |
7d29a247 | 2933 | } |
54d01ffb DG |
2934 | } |
2935 | ||
2936 | /* Setup kernel consumer socket and send fds to it */ | |
2937 | ret = init_kernel_tracing(ksession); | |
2938 | if (ret < 0) { | |
2939 | ret = LTTCOMM_KERN_START_FAIL; | |
2940 | goto error; | |
2941 | } | |
2942 | ||
2943 | /* This start the kernel tracing */ | |
2944 | ret = kernel_start_session(ksession); | |
2945 | if (ret < 0) { | |
2946 | ret = LTTCOMM_KERN_START_FAIL; | |
2947 | goto error; | |
2948 | } | |
2949 | ||
2950 | /* Quiescent wait after starting trace */ | |
2951 | kernel_wait_quiescent(kernel_tracer_fd); | |
2952 | } | |
2953 | ||
36dc12cc | 2954 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2955 | if (usess) { |
2956 | usess->start_trace = 1; | |
36dc12cc | 2957 | |
b9d9b220 DG |
2958 | ret = ust_app_start_trace_all(usess); |
2959 | if (ret < 0) { | |
2960 | ret = LTTCOMM_UST_START_FAIL; | |
2961 | goto error; | |
2962 | } | |
2bdd86d4 | 2963 | } |
54d01ffb DG |
2964 | |
2965 | ret = LTTCOMM_OK; | |
2966 | ||
2967 | error: | |
2968 | return ret; | |
2969 | } | |
2970 | ||
2971 | /* | |
2972 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2973 | */ | |
2974 | static int cmd_stop_trace(struct ltt_session *session) | |
2975 | { | |
2976 | int ret; | |
2977 | struct ltt_kernel_channel *kchan; | |
2978 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2979 | struct ltt_ust_session *usess; |
54d01ffb DG |
2980 | |
2981 | /* Short cut */ | |
2982 | ksession = session->kernel_session; | |
8be98f9a | 2983 | usess = session->ust_session; |
54d01ffb | 2984 | |
b9ef1c83 | 2985 | if (!session->enabled) { |
190df5ac | 2986 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2987 | goto error; |
2988 | } | |
2989 | ||
464dd62d | 2990 | session->enabled = 0; |
54d01ffb DG |
2991 | |
2992 | /* Kernel tracer */ | |
2993 | if (ksession != NULL) { | |
2994 | DBG("Stop kernel tracing"); | |
2995 | ||
2996 | /* Flush all buffers before stopping */ | |
2997 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2998 | if (ret < 0) { | |
2999 | ERR("Kernel metadata flush failed"); | |
3000 | } | |
f34daff7 | 3001 | |
54d01ffb DG |
3002 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3003 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3004 | if (ret < 0) { |
54d01ffb | 3005 | ERR("Kernel flush buffer error"); |
7d29a247 | 3006 | } |
54d01ffb | 3007 | } |
19e70852 | 3008 | |
54d01ffb DG |
3009 | ret = kernel_stop_session(ksession); |
3010 | if (ret < 0) { | |
3011 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3012 | goto error; |
f3ed775e | 3013 | } |
54d01ffb DG |
3014 | |
3015 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3016 | } |
54d01ffb | 3017 | |
8be98f9a MD |
3018 | if (usess) { |
3019 | usess->start_trace = 0; | |
2bdd86d4 | 3020 | |
8be98f9a | 3021 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3022 | if (ret < 0) { |
190df5ac | 3023 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3024 | goto error; |
3025 | } | |
2bdd86d4 | 3026 | } |
54d01ffb DG |
3027 | |
3028 | ret = LTTCOMM_OK; | |
3029 | ||
3030 | error: | |
3031 | return ret; | |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3036 | */ | |
6df2e2c9 | 3037 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
3038 | { |
3039 | int ret; | |
3040 | ||
6df2e2c9 | 3041 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
3042 | if (ret != LTTCOMM_OK) { |
3043 | goto error; | |
3044 | } | |
3045 | ||
3046 | ret = LTTCOMM_OK; | |
3047 | ||
3048 | error: | |
3049 | return ret; | |
3050 | } | |
3051 | ||
3052 | /* | |
3053 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3054 | */ | |
3055 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3056 | { | |
3057 | int ret; | |
3058 | ||
3059 | /* Clean kernel session teardown */ | |
3060 | teardown_kernel_session(session); | |
84cd17c6 MD |
3061 | /* UST session teardown */ |
3062 | teardown_ust_session(session); | |
54d01ffb DG |
3063 | |
3064 | /* | |
3065 | * Must notify the kernel thread here to update it's poll setin order | |
3066 | * to remove the channel(s)' fd just destroyed. | |
3067 | */ | |
3068 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3069 | if (ret < 0) { | |
3070 | perror("write kernel poll pipe"); | |
3071 | } | |
3072 | ||
271933a4 | 3073 | ret = session_destroy(session); |
54d01ffb DG |
3074 | |
3075 | return ret; | |
3076 | } | |
3077 | ||
3078 | /* | |
3079 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3080 | */ | |
3081 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3082 | { | |
3083 | int ret; | |
3084 | ||
3085 | switch (domain) { | |
3086 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3087 | { |
54d01ffb | 3088 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3089 | |
54d01ffb DG |
3090 | kcalibrate.type = calibrate->type; |
3091 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3092 | if (ret < 0) { |
54d01ffb DG |
3093 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3094 | goto error; | |
33a2b854 | 3095 | } |
54d01ffb DG |
3096 | break; |
3097 | } | |
3098 | default: | |
3099 | /* TODO: Userspace tracing */ | |
3100 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3101 | goto error; | |
3102 | } | |
33a2b854 | 3103 | |
54d01ffb | 3104 | ret = LTTCOMM_OK; |
33a2b854 | 3105 | |
54d01ffb DG |
3106 | error: |
3107 | return ret; | |
3108 | } | |
7d29a247 | 3109 | |
54d01ffb DG |
3110 | /* |
3111 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3112 | */ | |
3113 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3114 | char *sock_path) | |
3115 | { | |
3116 | int ret, sock; | |
b389abbe | 3117 | |
54d01ffb DG |
3118 | switch (domain) { |
3119 | case LTTNG_DOMAIN_KERNEL: | |
3120 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3121 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3122 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3123 | goto error; | |
3124 | } | |
3125 | ||
3126 | sock = lttcomm_connect_unix_sock(sock_path); | |
3127 | if (sock < 0) { | |
3128 | ret = LTTCOMM_CONNECT_FAIL; | |
3129 | goto error; | |
3130 | } | |
3131 | ||
3132 | session->kernel_session->consumer_fd = sock; | |
3133 | break; | |
3134 | default: | |
3135 | /* TODO: Userspace tracing */ | |
3136 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3137 | goto error; | |
3138 | } | |
3139 | ||
3140 | ret = LTTCOMM_OK; | |
3141 | ||
3142 | error: | |
3143 | return ret; | |
3144 | } | |
3145 | ||
3146 | /* | |
3147 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3148 | */ | |
3149 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3150 | struct lttng_domain **domains) | |
3151 | { | |
b551a063 | 3152 | int ret, index = 0; |
54d01ffb DG |
3153 | ssize_t nb_dom = 0; |
3154 | ||
3155 | if (session->kernel_session != NULL) { | |
b551a063 | 3156 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3157 | nb_dom++; |
3158 | } | |
3159 | ||
b551a063 DG |
3160 | if (session->ust_session != NULL) { |
3161 | DBG3("Listing domains found UST global domain"); | |
3162 | nb_dom++; | |
3163 | } | |
54d01ffb | 3164 | |
b551a063 | 3165 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3166 | if (*domains == NULL) { |
3167 | ret = -LTTCOMM_FATAL; | |
3168 | goto error; | |
3169 | } | |
3170 | ||
b551a063 DG |
3171 | if (session->kernel_session != NULL) { |
3172 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3173 | index++; | |
3174 | } | |
3175 | ||
3176 | if (session->ust_session != NULL) { | |
3177 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3178 | index++; | |
3179 | } | |
54d01ffb | 3180 | |
54d01ffb DG |
3181 | return nb_dom; |
3182 | ||
3183 | error: | |
3184 | return ret; | |
3185 | } | |
3186 | ||
3187 | /* | |
3188 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3189 | */ | |
b551a063 | 3190 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3191 | struct lttng_channel **channels) |
3192 | { | |
3193 | int ret; | |
3194 | ssize_t nb_chan = 0; | |
3195 | ||
b551a063 DG |
3196 | switch (domain) { |
3197 | case LTTNG_DOMAIN_KERNEL: | |
3198 | if (session->kernel_session != NULL) { | |
3199 | nb_chan = session->kernel_session->channel_count; | |
3200 | } | |
0df502fd | 3201 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3202 | break; |
3203 | case LTTNG_DOMAIN_UST: | |
3204 | if (session->ust_session != NULL) { | |
bec39940 | 3205 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3206 | session->ust_session->domain_global.channels); |
3207 | } | |
0df502fd | 3208 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3209 | break; |
3210 | default: | |
3211 | *channels = NULL; | |
3212 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3213 | goto error; |
3214 | } | |
3215 | ||
b551a063 DG |
3216 | if (nb_chan > 0) { |
3217 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3218 | if (*channels == NULL) { | |
3219 | ret = -LTTCOMM_FATAL; | |
3220 | goto error; | |
3221 | } | |
54d01ffb | 3222 | |
b551a063 DG |
3223 | list_lttng_channels(domain, session, *channels); |
3224 | } else { | |
3225 | *channels = NULL; | |
3226 | } | |
2bdd86d4 | 3227 | |
54d01ffb DG |
3228 | return nb_chan; |
3229 | ||
3230 | error: | |
3231 | return ret; | |
3232 | } | |
3233 | ||
3234 | /* | |
3235 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3236 | */ | |
b551a063 | 3237 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3238 | char *channel_name, struct lttng_event **events) |
3239 | { | |
b551a063 | 3240 | int ret = 0; |
54d01ffb | 3241 | ssize_t nb_event = 0; |
54d01ffb | 3242 | |
b551a063 DG |
3243 | switch (domain) { |
3244 | case LTTNG_DOMAIN_KERNEL: | |
3245 | if (session->kernel_session != NULL) { | |
3246 | nb_event = list_lttng_kernel_events(channel_name, | |
3247 | session->kernel_session, events); | |
54d01ffb | 3248 | } |
b551a063 DG |
3249 | break; |
3250 | case LTTNG_DOMAIN_UST: | |
3251 | { | |
3252 | if (session->ust_session != NULL) { | |
3253 | nb_event = list_lttng_ust_global_events(channel_name, | |
3254 | &session->ust_session->domain_global, events); | |
54d01ffb | 3255 | } |
b551a063 | 3256 | break; |
54d01ffb | 3257 | } |
b551a063 DG |
3258 | default: |
3259 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3260 | goto error; |
3261 | } | |
3262 | ||
b551a063 | 3263 | ret = nb_event; |
54d01ffb DG |
3264 | |
3265 | error: | |
3266 | return ret; | |
3267 | } | |
3268 | ||
3269 | /* | |
3270 | * Process the command requested by the lttng client within the command | |
3271 | * context structure. This function make sure that the return structure (llm) | |
3272 | * is set and ready for transmission before returning. | |
3273 | * | |
3274 | * Return any error encountered or 0 for success. | |
3275 | */ | |
3276 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3277 | { | |
3278 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3279 | int need_tracing_session = 1; |
54d01ffb DG |
3280 | |
3281 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3282 | ||
4fba7219 DG |
3283 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3284 | ret = LTTCOMM_KERN_NA; | |
3285 | goto error; | |
3286 | } | |
3287 | ||
54d01ffb DG |
3288 | /* |
3289 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3290 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3291 | * command. |
3292 | */ | |
3293 | switch(cmd_ctx->lsm->cmd_type) { | |
3294 | case LTTNG_LIST_SESSIONS: | |
3295 | case LTTNG_LIST_TRACEPOINTS: | |
3296 | case LTTNG_LIST_DOMAINS: | |
3297 | case LTTNG_LIST_CHANNELS: | |
3298 | case LTTNG_LIST_EVENTS: | |
3299 | break; | |
3300 | default: | |
3301 | /* Setup lttng message with no payload */ | |
3302 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3303 | if (ret < 0) { | |
3304 | /* This label does not try to unlock the session */ | |
3305 | goto init_setup_error; | |
3306 | } | |
3307 | } | |
3308 | ||
3309 | /* Commands that DO NOT need a session. */ | |
3310 | switch (cmd_ctx->lsm->cmd_type) { | |
3311 | case LTTNG_CALIBRATE: | |
3312 | case LTTNG_CREATE_SESSION: | |
3313 | case LTTNG_LIST_SESSIONS: | |
3314 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3315 | need_tracing_session = 0; |
54d01ffb DG |
3316 | break; |
3317 | default: | |
3318 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3319 | session_lock_list(); |
54d01ffb | 3320 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3321 | session_unlock_list(); |
54d01ffb DG |
3322 | if (cmd_ctx->session == NULL) { |
3323 | if (cmd_ctx->lsm->session.name != NULL) { | |
3324 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3325 | } else { | |
3326 | /* If no session name specified */ | |
3327 | ret = LTTCOMM_SELECT_SESS; | |
3328 | } | |
3329 | goto error; | |
3330 | } else { | |
3331 | /* Acquire lock for the session */ | |
3332 | session_lock(cmd_ctx->session); | |
3333 | } | |
3334 | break; | |
3335 | } | |
b389abbe | 3336 | |
54d01ffb DG |
3337 | /* |
3338 | * Check domain type for specific "pre-action". | |
3339 | */ | |
3340 | switch (cmd_ctx->lsm->domain.type) { | |
3341 | case LTTNG_DOMAIN_KERNEL: | |
3342 | /* Kernel tracer check */ | |
3343 | if (kernel_tracer_fd == 0) { | |
3344 | /* Basically, load kernel tracer modules */ | |
3345 | init_kernel_tracer(); | |
3346 | if (kernel_tracer_fd == 0) { | |
3347 | ret = LTTCOMM_KERN_NA; | |
3348 | goto error; | |
3349 | } | |
3350 | } | |
5eb91c98 | 3351 | |
54d01ffb | 3352 | /* Need a session for kernel command */ |
44d3bd01 | 3353 | if (need_tracing_session) { |
54d01ffb DG |
3354 | if (cmd_ctx->session->kernel_session == NULL) { |
3355 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3356 | if (ret < 0) { |
54d01ffb | 3357 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3358 | goto error; |
3359 | } | |
b389abbe | 3360 | } |
7d29a247 | 3361 | |
54d01ffb | 3362 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3363 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3364 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3365 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3366 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3367 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3368 | if (ret < 0) { |
54d01ffb DG |
3369 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3370 | goto error; | |
950131af | 3371 | } |
3ff2ecac MD |
3372 | } else { |
3373 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3374 | } |
0d0c377a | 3375 | } |
54d01ffb | 3376 | break; |
2bdd86d4 | 3377 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3378 | { |
44d3bd01 | 3379 | if (need_tracing_session) { |
f6a9efaa | 3380 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3381 | ret = create_ust_session(cmd_ctx->session, |
3382 | &cmd_ctx->lsm->domain); | |
3383 | if (ret != LTTCOMM_OK) { | |
3384 | goto error; | |
3385 | } | |
3386 | } | |
7753dea8 MD |
3387 | /* Start the UST consumer daemons */ |
3388 | /* 64-bit */ | |
3389 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3390 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3391 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3392 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3393 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3394 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3395 | if (ret < 0) { |
7753dea8 MD |
3396 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3397 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3398 | goto error; |
3399 | } | |
48842b30 | 3400 | |
7753dea8 | 3401 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3402 | } else { |
7753dea8 MD |
3403 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3404 | } | |
3405 | /* 32-bit */ | |
fc7a59ce | 3406 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3407 | ustconsumer32_data.pid == 0 && |
3408 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3409 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3410 | ret = start_consumerd(&ustconsumer32_data); | |
3411 | if (ret < 0) { | |
3412 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3413 | ust_consumerd32_fd = -EINVAL; | |
3414 | goto error; | |
3415 | } | |
3416 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3417 | } else { | |
3418 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3419 | } |
44d3bd01 DG |
3420 | } |
3421 | break; | |
3422 | } | |
54d01ffb | 3423 | default: |
54d01ffb DG |
3424 | break; |
3425 | } | |
33a2b854 | 3426 | |
8e0af1b4 MD |
3427 | /* |
3428 | * Check that the UID or GID match that of the tracing session. | |
3429 | * The root user can interact with all sessions. | |
3430 | */ | |
3431 | if (need_tracing_session) { | |
3432 | if (!session_access_ok(cmd_ctx->session, | |
3433 | cmd_ctx->creds.uid, cmd_ctx->creds.gid)) { | |
3434 | ret = LTTCOMM_EPERM; | |
3435 | goto error; | |
3436 | } | |
3437 | } | |
3438 | ||
54d01ffb DG |
3439 | /* Process by command type */ |
3440 | switch (cmd_ctx->lsm->cmd_type) { | |
3441 | case LTTNG_ADD_CONTEXT: | |
3442 | { | |
3443 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3444 | cmd_ctx->lsm->u.context.channel_name, | |
3445 | cmd_ctx->lsm->u.context.event_name, | |
3446 | &cmd_ctx->lsm->u.context.ctx); | |
3447 | break; | |
3448 | } | |
3449 | case LTTNG_DISABLE_CHANNEL: | |
3450 | { | |
3451 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3452 | cmd_ctx->lsm->u.disable.channel_name); | |
3453 | break; | |
3454 | } | |
3455 | case LTTNG_DISABLE_EVENT: | |
3456 | { | |
3457 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3458 | cmd_ctx->lsm->u.disable.channel_name, | |
3459 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3460 | ret = LTTCOMM_OK; |
3461 | break; | |
3462 | } | |
54d01ffb DG |
3463 | case LTTNG_DISABLE_ALL_EVENT: |
3464 | { | |
2bdd86d4 | 3465 | DBG("Disabling all events"); |
54d01ffb DG |
3466 | |
3467 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3468 | cmd_ctx->lsm->u.disable.channel_name); | |
3469 | break; | |
3470 | } | |
3471 | case LTTNG_ENABLE_CHANNEL: | |
3472 | { | |
aea829b3 | 3473 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3474 | &cmd_ctx->lsm->u.channel.chan); |
3475 | break; | |
3476 | } | |
3477 | case LTTNG_ENABLE_EVENT: | |
3478 | { | |
3479 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3480 | cmd_ctx->lsm->u.enable.channel_name, | |
3481 | &cmd_ctx->lsm->u.enable.event); | |
3482 | break; | |
3483 | } | |
3484 | case LTTNG_ENABLE_ALL_EVENT: | |
3485 | { | |
2bdd86d4 | 3486 | DBG("Enabling all events"); |
54d01ffb DG |
3487 | |
3488 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3489 | cmd_ctx->lsm->u.enable.channel_name, |
3490 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3491 | break; |
3492 | } | |
052da939 | 3493 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3494 | { |
9f19cc17 | 3495 | struct lttng_event *events; |
54d01ffb | 3496 | ssize_t nb_events; |
052da939 | 3497 | |
54d01ffb DG |
3498 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3499 | if (nb_events < 0) { | |
3500 | ret = -nb_events; | |
3501 | goto error; | |
2ef84c95 DG |
3502 | } |
3503 | ||
3504 | /* | |
3505 | * Setup lttng message with payload size set to the event list size in | |
3506 | * bytes and then copy list into the llm payload. | |
3507 | */ | |
052da939 | 3508 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3509 | if (ret < 0) { |
052da939 | 3510 | free(events); |
2ef84c95 DG |
3511 | goto setup_error; |
3512 | } | |
3513 | ||
3514 | /* Copy event list into message payload */ | |
9f19cc17 | 3515 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3516 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3517 | |
9f19cc17 | 3518 | free(events); |
2ef84c95 DG |
3519 | |
3520 | ret = LTTCOMM_OK; | |
3521 | break; | |
3522 | } | |
f3ed775e | 3523 | case LTTNG_START_TRACE: |
8c0faa1d | 3524 | { |
54d01ffb | 3525 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3526 | break; |
3527 | } | |
f3ed775e | 3528 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3529 | { |
54d01ffb | 3530 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3531 | break; |
3532 | } | |
5e16da05 MD |
3533 | case LTTNG_CREATE_SESSION: |
3534 | { | |
3c6bae61 | 3535 | tracepoint(create_session_start); |
54d01ffb | 3536 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3537 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
3c6bae61 | 3538 | tracepoint(create_session_end); |
5e16da05 MD |
3539 | break; |
3540 | } | |
3541 | case LTTNG_DESTROY_SESSION: | |
3542 | { | |
3c6bae61 | 3543 | tracepoint(destroy_session_start); |
54d01ffb DG |
3544 | ret = cmd_destroy_session(cmd_ctx->session, |
3545 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 3546 | tracepoint(destroy_session_end); |
5461b305 | 3547 | break; |
5e16da05 | 3548 | } |
9f19cc17 | 3549 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3550 | { |
54d01ffb DG |
3551 | ssize_t nb_dom; |
3552 | struct lttng_domain *domains; | |
5461b305 | 3553 | |
54d01ffb DG |
3554 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3555 | if (nb_dom < 0) { | |
3556 | ret = -nb_dom; | |
3557 | goto error; | |
ce3d728c | 3558 | } |
520ff687 | 3559 | |
54d01ffb | 3560 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3561 | if (ret < 0) { |
3562 | goto setup_error; | |
520ff687 | 3563 | } |
57167058 | 3564 | |
54d01ffb DG |
3565 | /* Copy event list into message payload */ |
3566 | memcpy(cmd_ctx->llm->payload, domains, | |
3567 | nb_dom * sizeof(struct lttng_domain)); | |
3568 | ||
3569 | free(domains); | |
5e16da05 | 3570 | |
5461b305 | 3571 | ret = LTTCOMM_OK; |
5e16da05 MD |
3572 | break; |
3573 | } | |
9f19cc17 | 3574 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3575 | { |
54d01ffb DG |
3576 | size_t nb_chan; |
3577 | struct lttng_channel *channels; | |
3578 | ||
b551a063 DG |
3579 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3580 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3581 | if (nb_chan < 0) { |
3582 | ret = -nb_chan; | |
3583 | goto error; | |
5461b305 | 3584 | } |
ca95a216 | 3585 | |
54d01ffb | 3586 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3587 | if (ret < 0) { |
3588 | goto setup_error; | |
3589 | } | |
9f19cc17 | 3590 | |
54d01ffb DG |
3591 | /* Copy event list into message payload */ |
3592 | memcpy(cmd_ctx->llm->payload, channels, | |
3593 | nb_chan * sizeof(struct lttng_channel)); | |
3594 | ||
3595 | free(channels); | |
9f19cc17 DG |
3596 | |
3597 | ret = LTTCOMM_OK; | |
5461b305 | 3598 | break; |
5e16da05 | 3599 | } |
9f19cc17 | 3600 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3601 | { |
b551a063 | 3602 | ssize_t nb_event; |
684d34d2 | 3603 | struct lttng_event *events = NULL; |
9f19cc17 | 3604 | |
b551a063 | 3605 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3606 | cmd_ctx->lsm->u.list.channel_name, &events); |
3607 | if (nb_event < 0) { | |
3608 | ret = -nb_event; | |
3609 | goto error; | |
5461b305 | 3610 | } |
ca95a216 | 3611 | |
54d01ffb | 3612 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3613 | if (ret < 0) { |
3614 | goto setup_error; | |
3615 | } | |
9f19cc17 | 3616 | |
54d01ffb DG |
3617 | /* Copy event list into message payload */ |
3618 | memcpy(cmd_ctx->llm->payload, events, | |
3619 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3620 | |
54d01ffb | 3621 | free(events); |
9f19cc17 DG |
3622 | |
3623 | ret = LTTCOMM_OK; | |
5461b305 | 3624 | break; |
5e16da05 MD |
3625 | } |
3626 | case LTTNG_LIST_SESSIONS: | |
3627 | { | |
8e0af1b4 | 3628 | unsigned int nr_sessions; |
5461b305 | 3629 | |
8e0af1b4 MD |
3630 | session_lock_list(); |
3631 | nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
3632 | if (nr_sessions == 0) { | |
f3ed775e | 3633 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3634 | session_unlock_list(); |
5461b305 | 3635 | goto error; |
57167058 | 3636 | } |
8e0af1b4 | 3637 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3638 | if (ret < 0) { |
54d01ffb | 3639 | session_unlock_list(); |
5461b305 | 3640 | goto setup_error; |
e065084a | 3641 | } |
5e16da05 | 3642 | |
6c9cc2ab | 3643 | /* Filled the session array */ |
8e0af1b4 MD |
3644 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
3645 | cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
6c9cc2ab | 3646 | |
54d01ffb | 3647 | session_unlock_list(); |
5e16da05 | 3648 | |
5461b305 | 3649 | ret = LTTCOMM_OK; |
5e16da05 MD |
3650 | break; |
3651 | } | |
d0254c7c MD |
3652 | case LTTNG_CALIBRATE: |
3653 | { | |
54d01ffb DG |
3654 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3655 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3656 | break; |
3657 | } | |
d9800920 DG |
3658 | case LTTNG_REGISTER_CONSUMER: |
3659 | { | |
54d01ffb DG |
3660 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3661 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3662 | break; |
3663 | } | |
5e16da05 | 3664 | default: |
5e16da05 | 3665 | ret = LTTCOMM_UND; |
5461b305 | 3666 | break; |
fac6795d DG |
3667 | } |
3668 | ||
5461b305 | 3669 | error: |
5461b305 DG |
3670 | if (cmd_ctx->llm == NULL) { |
3671 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3672 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3673 | goto setup_error; |
3674 | } | |
3675 | } | |
54d01ffb | 3676 | /* Set return code */ |
5461b305 | 3677 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3678 | setup_error: |
b5541356 | 3679 | if (cmd_ctx->session) { |
54d01ffb | 3680 | session_unlock(cmd_ctx->session); |
b5541356 | 3681 | } |
54d01ffb | 3682 | init_setup_error: |
8028d920 | 3683 | return ret; |
fac6795d DG |
3684 | } |
3685 | ||
1d4b027a | 3686 | /* |
d063d709 DG |
3687 | * This thread manage all clients request using the unix client socket for |
3688 | * communication. | |
1d4b027a DG |
3689 | */ |
3690 | static void *thread_manage_clients(void *data) | |
3691 | { | |
5eb91c98 DG |
3692 | int sock = 0, ret, i, pollfd; |
3693 | uint32_t revents, nb_fd; | |
273ea72c | 3694 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3695 | struct lttng_poll_event events; |
1d4b027a | 3696 | |
b25a8868 DG |
3697 | tracepoint(sessiond_th_cli_start); |
3698 | ||
1d4b027a DG |
3699 | DBG("[thread] Manage client started"); |
3700 | ||
f6a9efaa DG |
3701 | rcu_register_thread(); |
3702 | ||
1d4b027a DG |
3703 | ret = lttcomm_listen_unix_sock(client_sock); |
3704 | if (ret < 0) { | |
3705 | goto error; | |
3706 | } | |
3707 | ||
5eb91c98 DG |
3708 | /* |
3709 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3710 | * more will be added to this poll set. | |
3711 | */ | |
3712 | ret = create_thread_poll_set(&events, 2); | |
3713 | if (ret < 0) { | |
3714 | goto error; | |
3715 | } | |
273ea72c | 3716 | |
5eb91c98 DG |
3717 | /* Add the application registration socket */ |
3718 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3719 | if (ret < 0) { | |
3720 | goto error; | |
3721 | } | |
273ea72c | 3722 | |
bbd973c2 DG |
3723 | /* |
3724 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3725 | */ |
3726 | if (opt_sig_parent) { | |
3727 | kill(ppid, SIGCHLD); | |
3728 | } | |
3729 | ||
3730 | while (1) { | |
1d4b027a | 3731 | DBG("Accepting client command ..."); |
273ea72c | 3732 | |
b25a8868 DG |
3733 | tracepoint(sessiond_th_cli_poll); |
3734 | ||
5eb91c98 DG |
3735 | nb_fd = LTTNG_POLL_GETNB(&events); |
3736 | ||
273ea72c | 3737 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3738 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3739 | if (ret < 0) { |
273ea72c DG |
3740 | goto error; |
3741 | } | |
3742 | ||
5eb91c98 DG |
3743 | for (i = 0; i < nb_fd; i++) { |
3744 | /* Fetch once the poll data */ | |
3745 | revents = LTTNG_POLL_GETEV(&events, i); | |
3746 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3747 | ||
3748 | /* Thread quit pipe has been closed. Killing thread. */ | |
3749 | ret = check_thread_quit_pipe(pollfd, revents); | |
3750 | if (ret) { | |
3751 | goto error; | |
3752 | } | |
3753 | ||
3754 | /* Event on the registration socket */ | |
3755 | if (pollfd == client_sock) { | |
3756 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3757 | ERR("Client socket poll error"); | |
3758 | goto error; | |
3759 | } | |
3760 | } | |
273ea72c DG |
3761 | } |
3762 | ||
5eb91c98 DG |
3763 | DBG("Wait for client response"); |
3764 | ||
1d4b027a DG |
3765 | sock = lttcomm_accept_unix_sock(client_sock); |
3766 | if (sock < 0) { | |
3767 | goto error; | |
3768 | } | |
3769 | ||
be040666 DG |
3770 | /* Set socket option for credentials retrieval */ |
3771 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3772 | if (ret < 0) { | |
3773 | goto error; | |
3774 | } | |
3775 | ||
1d4b027a | 3776 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3777 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3778 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3779 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3780 | goto error; |
5eb91c98 | 3781 | } |
1d4b027a DG |
3782 | |
3783 | /* Allocate data buffer for reception */ | |
ba7f0ae5 | 3784 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3785 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3786 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3787 | goto error; |
3788 | } | |
1d4b027a | 3789 | |
1d4b027a DG |
3790 | cmd_ctx->llm = NULL; |
3791 | cmd_ctx->session = NULL; | |
3792 | ||
3793 | /* | |
3794 | * Data is received from the lttng client. The struct | |
3795 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3796 | * the client. | |
3797 | */ | |
3798 | DBG("Receiving data from client ..."); | |
be040666 DG |
3799 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3800 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
1d4b027a | 3801 | if (ret <= 0) { |
5eb91c98 DG |
3802 | DBG("Nothing recv() from client... continuing"); |
3803 | close(sock); | |
3804 | free(cmd_ctx); | |
1d4b027a DG |
3805 | continue; |
3806 | } | |
3807 | ||
5eb91c98 DG |
3808 | // TODO: Validate cmd_ctx including sanity check for |
3809 | // security purpose. | |
f7776ea7 | 3810 | |
f6a9efaa | 3811 | rcu_thread_online(); |
1d4b027a DG |
3812 | /* |
3813 | * This function dispatch the work to the kernel or userspace tracer | |
3814 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3815 | * informations for the client. The command context struct contains | |
3816 | * everything this function may needs. | |
3817 | */ | |
3818 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3819 | rcu_thread_offline(); |
1d4b027a | 3820 | if (ret < 0) { |
bbd973c2 | 3821 | /* |
5eb91c98 | 3822 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3823 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3824 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3825 | */ |
a2fb29a5 | 3826 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3827 | continue; |
3828 | } | |
3829 | ||
54d01ffb DG |
3830 | DBG("Sending response (size: %d, retcode: %s)", |
3831 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3832 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3833 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
3834 | if (ret < 0) { |
3835 | ERR("Failed to send data back to client"); | |
3836 | } | |
3837 | ||
d6e4fca4 DG |
3838 | /* End of transmission */ |
3839 | close(sock); | |
be040666 DG |
3840 | |
3841 | clean_command_ctx(&cmd_ctx); | |
1d4b027a DG |
3842 | } |
3843 | ||
3844 | error: | |
273ea72c | 3845 | DBG("Client thread dying"); |
273ea72c | 3846 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3847 | close(client_sock); |
3848 | close(sock); | |
273ea72c | 3849 | |
5eb91c98 | 3850 | lttng_poll_clean(&events); |
a2fb29a5 | 3851 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3852 | |
3853 | rcu_unregister_thread(); | |
1d4b027a DG |
3854 | return NULL; |
3855 | } | |
3856 | ||
3857 | ||
fac6795d DG |
3858 | /* |
3859 | * usage function on stderr | |
3860 | */ | |
3861 | static void usage(void) | |
3862 | { | |
b716ce68 | 3863 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3864 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3865 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3866 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3867 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3868 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3869 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3870 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3871 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3872 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3873 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3874 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3875 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3876 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3877 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3878 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3879 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3880 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3881 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3882 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3883 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3884 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3885 | } |
3886 | ||
3887 | /* | |
3888 | * daemon argument parsing | |
3889 | */ | |
3890 | static int parse_args(int argc, char **argv) | |
3891 | { | |
3892 | int c; | |
3893 | ||
3894 | static struct option long_options[] = { | |
3895 | { "client-sock", 1, 0, 'c' }, | |
3896 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3897 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3898 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3899 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3900 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3901 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3902 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3903 | { "consumerd32-path", 1, 0, 'u' }, | |
3904 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3905 | { "consumerd64-path", 1, 0, 't' }, | |
3906 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3907 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3908 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3909 | { "help", 0, 0, 'h' }, |
3910 | { "group", 1, 0, 'g' }, | |
3911 | { "version", 0, 0, 'V' }, | |
75462a81 | 3912 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3913 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3914 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3915 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3916 | { NULL, 0, 0, 0 } |
3917 | }; | |
3918 | ||
3919 | while (1) { | |
3920 | int option_index = 0; | |
4fba7219 | 3921 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3922 | long_options, &option_index); |
fac6795d DG |
3923 | if (c == -1) { |
3924 | break; | |
3925 | } | |
3926 | ||
3927 | switch (c) { | |
3928 | case 0: | |
3929 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3930 | if (optarg) { | |
3931 | fprintf(stderr, " with arg %s\n", optarg); | |
3932 | } | |
3933 | break; | |
b716ce68 | 3934 | case 'c': |
fac6795d DG |
3935 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3936 | break; | |
3937 | case 'a': | |
3938 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3939 | break; | |
3940 | case 'd': | |
3941 | opt_daemon = 1; | |
3942 | break; | |
3943 | case 'g': | |
fb09408a | 3944 | opt_tracing_group = optarg; |
fac6795d DG |
3945 | break; |
3946 | case 'h': | |
3947 | usage(); | |
3948 | exit(EXIT_FAILURE); | |
3949 | case 'V': | |
3950 | fprintf(stdout, "%s\n", VERSION); | |
3951 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3952 | case 'S': |
3953 | opt_sig_parent = 1; | |
3954 | break; | |
d6f42150 | 3955 | case 'E': |
3bd1e081 | 3956 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3957 | break; |
3958 | case 'C': | |
3bd1e081 MD |
3959 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3960 | break; | |
3961 | case 'F': | |
7753dea8 | 3962 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3963 | break; |
3964 | case 'D': | |
7753dea8 MD |
3965 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3966 | break; | |
3967 | case 'H': | |
3968 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3969 | break; | |
3970 | case 'G': | |
3971 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3972 | break; |
4fba7219 DG |
3973 | case 'N': |
3974 | opt_no_kernel = 1; | |
3975 | break; | |
75462a81 DG |
3976 | case 'q': |
3977 | opt_quiet = 1; | |
3978 | break; | |
3f9947db | 3979 | case 'v': |
53086306 DG |
3980 | /* Verbose level can increase using multiple -v */ |
3981 | opt_verbose += 1; | |
3f9947db | 3982 | break; |
31f73cc9 | 3983 | case 'Z': |
3bd1e081 | 3984 | opt_verbose_consumer += 1; |
31f73cc9 | 3985 | break; |
fb09408a | 3986 | case 'u': |
fc7a59ce | 3987 | consumerd32_bin= optarg; |
ebaeda94 MD |
3988 | break; |
3989 | case 'U': | |
3990 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3991 | break; |
3992 | case 't': | |
fc7a59ce | 3993 | consumerd64_bin = optarg; |
ebaeda94 MD |
3994 | break; |
3995 | case 'T': | |
3996 | consumerd64_libdir = optarg; | |
fb09408a | 3997 | break; |
fac6795d DG |
3998 | default: |
3999 | /* Unknown option or other error. | |
4000 | * Error is printed by getopt, just return */ | |
4001 | return -1; | |
4002 | } | |
4003 | } | |
4004 | ||
4005 | return 0; | |
4006 | } | |
4007 | ||
4008 | /* | |
d063d709 | 4009 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4010 | * apps_sock - The communication socket for all UST apps. |
4011 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4012 | */ |
cf3af59e | 4013 | static int init_daemon_socket(void) |
fac6795d DG |
4014 | { |
4015 | int ret = 0; | |
4016 | mode_t old_umask; | |
4017 | ||
4018 | old_umask = umask(0); | |
4019 | ||
4020 | /* Create client tool unix socket */ | |
d6f42150 DG |
4021 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4022 | if (client_sock < 0) { | |
4023 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4024 | ret = -1; |
4025 | goto end; | |
4026 | } | |
4027 | ||
4028 | /* File permission MUST be 660 */ | |
4029 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4030 | if (ret < 0) { | |
d6f42150 | 4031 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
4032 | perror("chmod"); |
4033 | goto end; | |
4034 | } | |
4035 | ||
4036 | /* Create the application unix socket */ | |
d6f42150 DG |
4037 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4038 | if (apps_sock < 0) { | |
4039 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4040 | ret = -1; |
4041 | goto end; | |
4042 | } | |
4043 | ||
d6f42150 | 4044 | /* File permission MUST be 666 */ |
54d01ffb DG |
4045 | ret = chmod(apps_unix_sock_path, |
4046 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4047 | if (ret < 0) { |
d6f42150 | 4048 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
4049 | perror("chmod"); |
4050 | goto end; | |
4051 | } | |
4052 | ||
4053 | end: | |
4054 | umask(old_umask); | |
4055 | return ret; | |
4056 | } | |
4057 | ||
4058 | /* | |
54d01ffb DG |
4059 | * Check if the global socket is available, and if a daemon is answering at the |
4060 | * other side. If yes, error is returned. | |
fac6795d | 4061 | */ |
cf3af59e | 4062 | static int check_existing_daemon(void) |
fac6795d | 4063 | { |
7d8234d9 | 4064 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 4065 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 4066 | return 0; |
099e26bd | 4067 | } |
54d01ffb | 4068 | |
7d8234d9 | 4069 | /* Is there anybody out there ? */ |
099e26bd | 4070 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4071 | return -EEXIST; |
099e26bd | 4072 | } else { |
7d8234d9 | 4073 | return 0; |
099e26bd | 4074 | } |
fac6795d DG |
4075 | } |
4076 | ||
fac6795d | 4077 | /* |
d063d709 | 4078 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4079 | * |
d063d709 DG |
4080 | * Race window between mkdir and chown is OK because we are going from more |
4081 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4082 | */ |
be040666 | 4083 | static int set_permissions(char *rundir) |
fac6795d DG |
4084 | { |
4085 | int ret; | |
996b65c8 | 4086 | gid_t gid; |
fac6795d | 4087 | |
996b65c8 MD |
4088 | gid = allowed_group(); |
4089 | if (gid < 0) { | |
be040666 DG |
4090 | WARN("No tracing group detected"); |
4091 | ret = 0; | |
fac6795d DG |
4092 | goto end; |
4093 | } | |
4094 | ||
d6f42150 | 4095 | /* Set lttng run dir */ |
be040666 | 4096 | ret = chown(rundir, 0, gid); |
d6f42150 | 4097 | if (ret < 0) { |
be040666 | 4098 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4099 | perror("chown"); |
4100 | } | |
4101 | ||
4102 | /* lttng client socket path */ | |
996b65c8 | 4103 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4104 | if (ret < 0) { |
d6f42150 DG |
4105 | ERR("Unable to set group on %s", client_unix_sock_path); |
4106 | perror("chown"); | |
4107 | } | |
4108 | ||
3bd1e081 MD |
4109 | /* kconsumer error socket path */ |
4110 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4111 | if (ret < 0) { |
3bd1e081 MD |
4112 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4113 | perror("chown"); | |
4114 | } | |
4115 | ||
7753dea8 MD |
4116 | /* 64-bit ustconsumer error socket path */ |
4117 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4118 | if (ret < 0) { | |
4119 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4120 | perror("chown"); | |
4121 | } | |
4122 | ||
4123 | /* 32-bit ustconsumer compat32 error socket path */ | |
4124 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4125 | if (ret < 0) { |
7753dea8 | 4126 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4127 | perror("chown"); |
4128 | } | |
4129 | ||
d6f42150 | 4130 | DBG("All permissions are set"); |
e07ae692 | 4131 | |
fac6795d DG |
4132 | end: |
4133 | return ret; | |
4134 | } | |
4135 | ||
7a485870 | 4136 | /* |
d063d709 | 4137 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4138 | */ |
4139 | static int create_kernel_poll_pipe(void) | |
4140 | { | |
4141 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4142 | } | |
4143 | ||
099e26bd DG |
4144 | /* |
4145 | * Create the application command pipe to wake thread_manage_apps. | |
4146 | */ | |
4147 | static int create_apps_cmd_pipe(void) | |
4148 | { | |
4149 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4150 | } | |
4151 | ||
d6f42150 | 4152 | /* |
d063d709 | 4153 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4154 | */ |
67e40797 | 4155 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4156 | { |
4157 | int ret; | |
4158 | ||
67e40797 DG |
4159 | DBG3("Creating LTTng run directory: %s", rundir); |
4160 | ||
4161 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4162 | if (ret < 0) { |
b1f11e69 | 4163 | if (errno != EEXIST) { |
67e40797 | 4164 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4165 | goto error; |
4166 | } else { | |
4167 | ret = 0; | |
4168 | } | |
d6f42150 DG |
4169 | } |
4170 | ||
4171 | error: | |
4172 | return ret; | |
4173 | } | |
4174 | ||
4175 | /* | |
d063d709 DG |
4176 | * Setup sockets and directory needed by the kconsumerd communication with the |
4177 | * session daemon. | |
d6f42150 | 4178 | */ |
67e40797 DG |
4179 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4180 | const char *rundir) | |
d6f42150 DG |
4181 | { |
4182 | int ret; | |
67e40797 | 4183 | char path[PATH_MAX]; |
d6f42150 | 4184 | |
67e40797 | 4185 | switch (consumer_data->type) { |
7753dea8 | 4186 | case LTTNG_CONSUMER_KERNEL: |
67e40797 | 4187 | snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4188 | break; |
4189 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 4190 | snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4191 | break; |
4192 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 4193 | snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4194 | break; |
4195 | default: | |
4196 | ERR("Consumer type unknown"); | |
4197 | ret = -EINVAL; | |
4198 | goto error; | |
d6f42150 DG |
4199 | } |
4200 | ||
67e40797 DG |
4201 | DBG2("Creating consumer directory: %s", path); |
4202 | ||
3bd1e081 | 4203 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4204 | if (ret < 0) { |
6beb2242 | 4205 | if (errno != EEXIST) { |
3bd1e081 | 4206 | ERR("Failed to create %s", path); |
6beb2242 DG |
4207 | goto error; |
4208 | } | |
4209 | ret = 0; | |
d6f42150 DG |
4210 | } |
4211 | ||
4212 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4213 | consumer_data->err_sock = |
4214 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4215 | if (consumer_data->err_sock < 0) { | |
4216 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4217 | ret = -1; |
4218 | goto error; | |
4219 | } | |
4220 | ||
4221 | /* File permission MUST be 660 */ | |
3bd1e081 | 4222 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4223 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4224 | if (ret < 0) { |
3bd1e081 | 4225 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4226 | PERROR("chmod"); |
d6f42150 DG |
4227 | goto error; |
4228 | } | |
4229 | ||
4230 | error: | |
4231 | return ret; | |
4232 | } | |
4233 | ||
fac6795d | 4234 | /* |
d063d709 | 4235 | * Signal handler for the daemon |
cf3af59e | 4236 | * |
54d01ffb DG |
4237 | * Simply stop all worker threads, leaving main() return gracefully after |
4238 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4239 | */ |
4240 | static void sighandler(int sig) | |
4241 | { | |
4242 | switch (sig) { | |
cf3af59e MD |
4243 | case SIGPIPE: |
4244 | DBG("SIGPIPE catched"); | |
4245 | return; | |
4246 | case SIGINT: | |
4247 | DBG("SIGINT catched"); | |
4248 | stop_threads(); | |
4249 | break; | |
4250 | case SIGTERM: | |
4251 | DBG("SIGTERM catched"); | |
4252 | stop_threads(); | |
4253 | break; | |
4254 | default: | |
4255 | break; | |
fac6795d | 4256 | } |
fac6795d DG |
4257 | } |
4258 | ||
4259 | /* | |
d063d709 | 4260 | * Setup signal handler for : |
1d4b027a | 4261 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4262 | */ |
1d4b027a | 4263 | static int set_signal_handler(void) |
fac6795d | 4264 | { |
1d4b027a DG |
4265 | int ret = 0; |
4266 | struct sigaction sa; | |
4267 | sigset_t sigset; | |
fac6795d | 4268 | |
1d4b027a DG |
4269 | if ((ret = sigemptyset(&sigset)) < 0) { |
4270 | perror("sigemptyset"); | |
4271 | return ret; | |
4272 | } | |
d6f42150 | 4273 | |
1d4b027a DG |
4274 | sa.sa_handler = sighandler; |
4275 | sa.sa_mask = sigset; | |
4276 | sa.sa_flags = 0; | |
4277 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4278 | perror("sigaction"); | |
4279 | return ret; | |
d6f42150 DG |
4280 | } |
4281 | ||
1d4b027a DG |
4282 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4283 | perror("sigaction"); | |
4284 | return ret; | |
d6f42150 | 4285 | } |
aaf26714 | 4286 | |
1d4b027a DG |
4287 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4288 | perror("sigaction"); | |
4289 | return ret; | |
8c0faa1d DG |
4290 | } |
4291 | ||
1d4b027a DG |
4292 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4293 | ||
4294 | return ret; | |
fac6795d DG |
4295 | } |
4296 | ||
f3ed775e | 4297 | /* |
d063d709 DG |
4298 | * Set open files limit to unlimited. This daemon can open a large number of |
4299 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4300 | */ |
4301 | static void set_ulimit(void) | |
4302 | { | |
4303 | int ret; | |
4304 | struct rlimit lim; | |
4305 | ||
a88df331 | 4306 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4307 | lim.rlim_cur = 65535; |
4308 | lim.rlim_max = 65535; | |
4309 | ||
4310 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4311 | if (ret < 0) { | |
4312 | perror("failed to set open files limit"); | |
4313 | } | |
4314 | } | |
4315 | ||
fac6795d DG |
4316 | /* |
4317 | * main | |
4318 | */ | |
4319 | int main(int argc, char **argv) | |
4320 | { | |
fac6795d DG |
4321 | int ret = 0; |
4322 | void *status; | |
b082db07 | 4323 | const char *home_path; |
fac6795d | 4324 | |
b25a8868 | 4325 | tracepoint(sessiond_boot_start); |
f6a9efaa | 4326 | rcu_register_thread(); |
b25a8868 | 4327 | |
273ea72c | 4328 | /* Create thread quit pipe */ |
cf3af59e MD |
4329 | if ((ret = init_thread_quit_pipe()) < 0) { |
4330 | goto error; | |
273ea72c DG |
4331 | } |
4332 | ||
7753dea8 | 4333 | setup_consumerd_path(); |
fb09408a | 4334 | |
fac6795d DG |
4335 | /* Parse arguments */ |
4336 | progname = argv[0]; | |
4337 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4338 | goto error; |
fac6795d DG |
4339 | } |
4340 | ||
4341 | /* Daemonize */ | |
4342 | if (opt_daemon) { | |
53094c05 DG |
4343 | ret = daemon(0, 0); |
4344 | if (ret < 0) { | |
4345 | perror("daemon"); | |
cf3af59e | 4346 | goto error; |
53094c05 | 4347 | } |
fac6795d DG |
4348 | } |
4349 | ||
4350 | /* Check if daemon is UID = 0 */ | |
4351 | is_root = !getuid(); | |
4352 | ||
fac6795d | 4353 | if (is_root) { |
67e40797 DG |
4354 | rundir = strdup(LTTNG_RUNDIR); |
4355 | ||
4356 | /* Create global run dir with root access */ | |
4357 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4358 | if (ret < 0) { |
cf3af59e | 4359 | goto error; |
d6f42150 DG |
4360 | } |
4361 | ||
fac6795d | 4362 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4363 | snprintf(apps_unix_sock_path, PATH_MAX, |
4364 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4365 | } |
4366 | ||
4367 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4368 | snprintf(client_unix_sock_path, PATH_MAX, |
4369 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4370 | } | |
0fdd1e2c DG |
4371 | |
4372 | /* Set global SHM for ust */ | |
4373 | if (strlen(wait_shm_path) == 0) { | |
4374 | snprintf(wait_shm_path, PATH_MAX, | |
4375 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4376 | } | |
67e40797 DG |
4377 | |
4378 | /* Setup kernel consumerd path */ | |
4379 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
4380 | KCONSUMERD_ERR_SOCK_PATH, rundir); | |
4381 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
4382 | KCONSUMERD_CMD_SOCK_PATH, rundir); | |
4383 | ||
4384 | DBG2("Kernel consumer err path: %s", | |
4385 | kconsumer_data.err_unix_sock_path); | |
4386 | DBG2("Kernel consumer cmd path: %s", | |
4387 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4388 | } else { |
b082db07 DG |
4389 | home_path = get_home_dir(); |
4390 | if (home_path == NULL) { | |
273ea72c DG |
4391 | /* TODO: Add --socket PATH option */ |
4392 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4393 | ret = -EPERM; |
4394 | goto error; | |
b082db07 DG |
4395 | } |
4396 | ||
67e40797 DG |
4397 | /* |
4398 | * Create rundir from home path. This will create something like | |
4399 | * $HOME/.lttng | |
4400 | */ | |
4401 | ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); | |
4402 | if (ret < 0) { | |
4403 | ret = -ENOMEM; | |
4404 | goto error; | |
4405 | } | |
4406 | ||
4407 | ret = create_lttng_rundir(rundir); | |
4408 | if (ret < 0) { | |
4409 | goto error; | |
4410 | } | |
4411 | ||
fac6795d | 4412 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4413 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4414 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4415 | } |
4416 | ||
4417 | /* Set the cli tool unix socket path */ | |
4418 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4419 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4420 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4421 | } |
0fdd1e2c DG |
4422 | |
4423 | /* Set global SHM for ust */ | |
4424 | if (strlen(wait_shm_path) == 0) { | |
4425 | snprintf(wait_shm_path, PATH_MAX, | |
4426 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4427 | } | |
fac6795d DG |
4428 | } |
4429 | ||
847177cd DG |
4430 | DBG("Client socket path %s", client_unix_sock_path); |
4431 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4432 | DBG("LTTng run directory path: %s", rundir); |
4433 | ||
4434 | /* 32 bits consumerd path setup */ | |
4435 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
4436 | USTCONSUMERD32_ERR_SOCK_PATH, rundir); | |
4437 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
4438 | USTCONSUMERD32_CMD_SOCK_PATH, rundir); | |
4439 | ||
4440 | DBG2("UST consumer 32 bits err path: %s", | |
4441 | ustconsumer32_data.err_unix_sock_path); | |
4442 | DBG2("UST consumer 32 bits cmd path: %s", | |
4443 | ustconsumer32_data.cmd_unix_sock_path); | |
4444 | ||
4445 | /* 64 bits consumerd path setup */ | |
4446 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
4447 | USTCONSUMERD64_ERR_SOCK_PATH, rundir); | |
4448 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
4449 | USTCONSUMERD64_CMD_SOCK_PATH, rundir); | |
4450 | ||
4451 | DBG2("UST consumer 64 bits err path: %s", | |
4452 | ustconsumer64_data.err_unix_sock_path); | |
4453 | DBG2("UST consumer 64 bits cmd path: %s", | |
4454 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4455 | |
273ea72c | 4456 | /* |
7d8234d9 | 4457 | * See if daemon already exist. |
fac6795d | 4458 | */ |
7d8234d9 | 4459 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4460 | ERR("Already running daemon.\n"); |
273ea72c | 4461 | /* |
cf3af59e MD |
4462 | * We do not goto exit because we must not cleanup() |
4463 | * because a daemon is already running. | |
ab118b20 | 4464 | */ |
cf3af59e | 4465 | goto error; |
a88df331 DG |
4466 | } |
4467 | ||
54d01ffb | 4468 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4469 | |
4470 | /* | |
4471 | * These actions must be executed as root. We do that *after* setting up | |
4472 | * the sockets path because we MUST make the check for another daemon using | |
4473 | * those paths *before* trying to set the kernel consumer sockets and init | |
4474 | * kernel tracer. | |
4475 | */ | |
4476 | if (is_root) { | |
67e40797 | 4477 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4478 | if (ret < 0) { |
4479 | goto exit; | |
4480 | } | |
4481 | ||
a88df331 | 4482 | /* Setup kernel tracer */ |
4fba7219 DG |
4483 | if (!opt_no_kernel) { |
4484 | init_kernel_tracer(); | |
4485 | } | |
a88df331 DG |
4486 | |
4487 | /* Set ulimit for open files */ | |
4488 | set_ulimit(); | |
fac6795d DG |
4489 | } |
4490 | ||
67e40797 DG |
4491 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4492 | if (ret < 0) { | |
4493 | goto exit; | |
4494 | } | |
4495 | ||
4496 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4497 | if (ret < 0) { | |
4498 | goto exit; | |
4499 | } | |
4500 | ||
cf3af59e MD |
4501 | if ((ret = set_signal_handler()) < 0) { |
4502 | goto exit; | |
fac6795d DG |
4503 | } |
4504 | ||
d6f42150 | 4505 | /* Setup the needed unix socket */ |
cf3af59e MD |
4506 | if ((ret = init_daemon_socket()) < 0) { |
4507 | goto exit; | |
fac6795d DG |
4508 | } |
4509 | ||
4510 | /* Set credentials to socket */ | |
be040666 | 4511 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4512 | goto exit; |
fac6795d DG |
4513 | } |
4514 | ||
5b8719f5 DG |
4515 | /* Get parent pid if -S, --sig-parent is specified. */ |
4516 | if (opt_sig_parent) { | |
4517 | ppid = getppid(); | |
4518 | } | |
4519 | ||
7a485870 | 4520 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4521 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4522 | goto exit; | |
7a485870 DG |
4523 | } |
4524 | ||
099e26bd DG |
4525 | /* Setup the thread apps communication pipe. */ |
4526 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4527 | goto exit; | |
4528 | } | |
4529 | ||
4530 | /* Init UST command queue. */ | |
4531 | cds_wfq_init(&ust_cmd_queue.queue); | |
4532 | ||
f6a9efaa DG |
4533 | /* Init UST app hash table */ |
4534 | ust_app_ht_alloc(); | |
4535 | ||
273ea72c | 4536 | /* |
54d01ffb DG |
4537 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4538 | * statically declared in session.c | |
273ea72c | 4539 | */ |
54d01ffb | 4540 | session_list_ptr = session_get_list(); |
b5541356 | 4541 | |
5eb91c98 DG |
4542 | /* Set up max poll set size */ |
4543 | lttng_poll_set_max_size(); | |
4544 | ||
cf3af59e | 4545 | /* Create thread to manage the client socket */ |
099e26bd DG |
4546 | ret = pthread_create(&client_thread, NULL, |
4547 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4548 | if (ret != 0) { |
099e26bd | 4549 | perror("pthread_create clients"); |
cf3af59e MD |
4550 | goto exit_client; |
4551 | } | |
fac6795d | 4552 | |
099e26bd DG |
4553 | /* Create thread to dispatch registration */ |
4554 | ret = pthread_create(&dispatch_thread, NULL, | |
4555 | thread_dispatch_ust_registration, (void *) NULL); | |
4556 | if (ret != 0) { | |
4557 | perror("pthread_create dispatch"); | |
4558 | goto exit_dispatch; | |
4559 | } | |
4560 | ||
4561 | /* Create thread to manage application registration. */ | |
4562 | ret = pthread_create(®_apps_thread, NULL, | |
4563 | thread_registration_apps, (void *) NULL); | |
4564 | if (ret != 0) { | |
4565 | perror("pthread_create registration"); | |
4566 | goto exit_reg_apps; | |
4567 | } | |
4568 | ||
cf3af59e | 4569 | /* Create thread to manage application socket */ |
54d01ffb DG |
4570 | ret = pthread_create(&apps_thread, NULL, |
4571 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4572 | if (ret != 0) { |
099e26bd | 4573 | perror("pthread_create apps"); |
cf3af59e MD |
4574 | goto exit_apps; |
4575 | } | |
fac6795d | 4576 | |
cf3af59e | 4577 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4578 | ret = pthread_create(&kernel_thread, NULL, |
4579 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4580 | if (ret != 0) { |
099e26bd | 4581 | perror("pthread_create kernel"); |
cf3af59e MD |
4582 | goto exit_kernel; |
4583 | } | |
7a485870 | 4584 | |
b25a8868 DG |
4585 | tracepoint(sessiond_boot_end); |
4586 | ||
cf3af59e MD |
4587 | ret = pthread_join(kernel_thread, &status); |
4588 | if (ret != 0) { | |
4589 | perror("pthread_join"); | |
4590 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4591 | } |
4592 | ||
cf3af59e MD |
4593 | exit_kernel: |
4594 | ret = pthread_join(apps_thread, &status); | |
4595 | if (ret != 0) { | |
4596 | perror("pthread_join"); | |
4597 | goto error; /* join error, exit without cleanup */ | |
4598 | } | |
fac6795d | 4599 | |
cf3af59e | 4600 | exit_apps: |
099e26bd DG |
4601 | ret = pthread_join(reg_apps_thread, &status); |
4602 | if (ret != 0) { | |
4603 | perror("pthread_join"); | |
4604 | goto error; /* join error, exit without cleanup */ | |
4605 | } | |
4606 | ||
4607 | exit_reg_apps: | |
4608 | ret = pthread_join(dispatch_thread, &status); | |
4609 | if (ret != 0) { | |
4610 | perror("pthread_join"); | |
4611 | goto error; /* join error, exit without cleanup */ | |
4612 | } | |
4613 | ||
4614 | exit_dispatch: | |
cf3af59e MD |
4615 | ret = pthread_join(client_thread, &status); |
4616 | if (ret != 0) { | |
4617 | perror("pthread_join"); | |
4618 | goto error; /* join error, exit without cleanup */ | |
4619 | } | |
4620 | ||
3bd1e081 | 4621 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4622 | if (ret != 0) { |
3bd1e081 | 4623 | perror("join_consumer"); |
cf3af59e MD |
4624 | goto error; /* join error, exit without cleanup */ |
4625 | } | |
a88df331 | 4626 | |
cf3af59e | 4627 | exit_client: |
a88df331 | 4628 | exit: |
cf3af59e MD |
4629 | /* |
4630 | * cleanup() is called when no other thread is running. | |
4631 | */ | |
f6a9efaa | 4632 | rcu_thread_online(); |
cf3af59e | 4633 | cleanup(); |
f6a9efaa DG |
4634 | rcu_thread_offline(); |
4635 | rcu_unregister_thread(); | |
67e40797 | 4636 | if (!ret) { |
cf3af59e | 4637 | exit(EXIT_SUCCESS); |
67e40797 | 4638 | } |
cf3af59e | 4639 | error: |
5e16da05 | 4640 | exit(EXIT_FAILURE); |
fac6795d | 4641 | } |