Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d DG |
38 | #include <unistd.h> |
39 | ||
1e307fab | 40 | #include <ltt-kconsumerd.h> |
e88129fc | 41 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
42 | #include <lttng/lttng-kconsumerd.h> |
43 | #include <lttngerr.h> | |
fac6795d | 44 | |
54d01ffb | 45 | #include "channel.h" |
5eb91c98 | 46 | #include "compat/poll.h" |
b579acd9 | 47 | #include "context.h" |
54d01ffb | 48 | #include "event.h" |
099e26bd | 49 | #include "futex.h" |
20fe2104 | 50 | #include "kernel-ctl.h" |
1e307fab | 51 | #include "ltt-sessiond.h" |
0fdd1e2c | 52 | #include "shm.h" |
56fff090 | 53 | #include "ust-app.h" |
1e307fab | 54 | #include "ust-ctl.h" |
8e68d1c8 | 55 | #include "utils.h" |
0177d773 | 56 | #include "ust-ctl.h" |
fac6795d | 57 | |
b25a8868 DG |
58 | #include "benchmark.h" |
59 | ||
75462a81 | 60 | /* Const values */ |
686204ab | 61 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 62 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
63 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
64 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
65 | ||
fac6795d | 66 | /* Variables */ |
1d4b027a | 67 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 68 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 69 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 70 | |
fac6795d DG |
71 | const char *progname; |
72 | const char *opt_tracing_group; | |
5b8719f5 | 73 | static int opt_sig_parent; |
fac6795d DG |
74 | static int opt_daemon; |
75 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
76 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
77 | static pid_t kconsumerd_pid; | |
099e26bd | 78 | static int dispatch_thread_exit; |
fac6795d | 79 | |
54d01ffb DG |
80 | /* Global application Unix socket path */ |
81 | static char apps_unix_sock_path[PATH_MAX]; | |
82 | /* Global client Unix socket path */ | |
83 | static char client_unix_sock_path[PATH_MAX]; | |
84 | /* kconsumerd error and command Unix socket path */ | |
85 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; | |
86 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; | |
87 | /* global wait shm path for UST */ | |
88 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 89 | |
1d4b027a | 90 | /* Sockets and FDs */ |
d6f42150 DG |
91 | static int client_sock; |
92 | static int apps_sock; | |
93 | static int kconsumerd_err_sock; | |
8c0faa1d | 94 | static int kconsumerd_cmd_sock; |
20fe2104 | 95 | static int kernel_tracer_fd; |
7a485870 | 96 | static int kernel_poll_pipe[2]; |
1d4b027a | 97 | |
273ea72c DG |
98 | /* |
99 | * Quit pipe for all threads. This permits a single cancellation point | |
100 | * for all threads when receiving an event on the pipe. | |
101 | */ | |
102 | static int thread_quit_pipe[2]; | |
103 | ||
099e26bd DG |
104 | /* |
105 | * This pipe is used to inform the thread managing application communication | |
106 | * that a command is queued and ready to be processed. | |
107 | */ | |
108 | static int apps_cmd_pipe[2]; | |
109 | ||
1d4b027a | 110 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 111 | static pthread_t kconsumerd_thread; |
1d4b027a | 112 | static pthread_t apps_thread; |
099e26bd | 113 | static pthread_t reg_apps_thread; |
1d4b027a | 114 | static pthread_t client_thread; |
7a485870 | 115 | static pthread_t kernel_thread; |
099e26bd | 116 | static pthread_t dispatch_thread; |
8c0faa1d DG |
117 | static sem_t kconsumerd_sem; |
118 | ||
5eb91c98 DG |
119 | |
120 | /* Mutex to control kconsumerd pid assignation */ | |
121 | static pthread_mutex_t kconsumerd_pid_mutex; | |
fac6795d | 122 | |
099e26bd DG |
123 | /* |
124 | * UST registration command queue. This queue is tied with a futex and uses a N | |
125 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
126 | * | |
127 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
128 | * this queue and the wait/wake scheme. | |
129 | */ | |
130 | static struct ust_cmd_queue ust_cmd_queue; | |
131 | ||
b5541356 DG |
132 | /* |
133 | * Pointer initialized before thread creation. | |
134 | * | |
135 | * This points to the tracing session list containing the session count and a | |
136 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
137 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 138 | * |
d063d709 | 139 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 140 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
141 | */ |
142 | static struct ltt_session_list *session_list_ptr; | |
143 | ||
5eb91c98 DG |
144 | /* |
145 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
146 | */ | |
147 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
148 | unsigned int size) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (events == NULL || size == 0) { | |
153 | ret = -1; | |
154 | goto error; | |
155 | } | |
156 | ||
157 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
158 | if (ret < 0) { | |
159 | goto error; | |
160 | } | |
161 | ||
162 | /* Add quit pipe */ | |
163 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
164 | if (ret < 0) { | |
165 | goto error; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | ||
170 | error: | |
171 | return ret; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Check if the thread quit pipe was triggered. | |
176 | * | |
177 | * Return 1 if it was triggered else 0; | |
178 | */ | |
179 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
180 | { | |
181 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
182 | return 1; | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
0fdd1e2c DG |
188 | /* |
189 | * Remove modules in reverse load order. | |
190 | */ | |
191 | static int modprobe_remove_kernel_modules(void) | |
192 | { | |
193 | int ret = 0, i; | |
194 | char modprobe[256]; | |
195 | ||
196 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
197 | ret = snprintf(modprobe, sizeof(modprobe), | |
198 | "/sbin/modprobe --remove --quiet %s", | |
199 | kernel_modules_list[i].name); | |
200 | if (ret < 0) { | |
201 | perror("snprintf modprobe --remove"); | |
202 | goto error; | |
203 | } | |
204 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
205 | ret = system(modprobe); | |
206 | if (ret == -1) { | |
207 | ERR("Unable to launch modprobe --remove for module %s", | |
208 | kernel_modules_list[i].name); | |
209 | } else if (kernel_modules_list[i].required | |
210 | && WEXITSTATUS(ret) != 0) { | |
211 | ERR("Unable to remove module %s", | |
212 | kernel_modules_list[i].name); | |
213 | } else { | |
214 | DBG("Modprobe removal successful %s", | |
215 | kernel_modules_list[i].name); | |
216 | } | |
217 | } | |
218 | ||
219 | error: | |
220 | return ret; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Return group ID of the tracing group or -1 if not found. | |
225 | */ | |
996b65c8 MD |
226 | static gid_t allowed_group(void) |
227 | { | |
228 | struct group *grp; | |
229 | ||
274e143b MD |
230 | if (opt_tracing_group) { |
231 | grp = getgrnam(opt_tracing_group); | |
232 | } else { | |
233 | grp = getgrnam(default_tracing_group); | |
234 | } | |
996b65c8 MD |
235 | if (!grp) { |
236 | return -1; | |
237 | } else { | |
238 | return grp->gr_gid; | |
239 | } | |
240 | } | |
241 | ||
273ea72c | 242 | /* |
5eb91c98 | 243 | * Init thread quit pipe. |
273ea72c DG |
244 | * |
245 | * Return -1 on error or 0 if all pipes are created. | |
246 | */ | |
247 | static int init_thread_quit_pipe(void) | |
248 | { | |
249 | int ret; | |
250 | ||
251 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
252 | if (ret < 0) { | |
253 | perror("thread quit pipe"); | |
254 | goto error; | |
255 | } | |
256 | ||
257 | error: | |
258 | return ret; | |
259 | } | |
260 | ||
fac6795d | 261 | /* |
d063d709 DG |
262 | * Complete teardown of a kernel session. This free all data structure related |
263 | * to a kernel session and update counter. | |
fac6795d | 264 | */ |
1d4b027a | 265 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 266 | { |
1d4b027a DG |
267 | if (session->kernel_session != NULL) { |
268 | DBG("Tearing down kernel session"); | |
d9800920 DG |
269 | |
270 | /* | |
271 | * If a custom kernel consumer was registered, close the socket before | |
272 | * tearing down the complete kernel session structure | |
273 | */ | |
274 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
275 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
276 | } | |
277 | ||
62499ad6 | 278 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
279 | /* Extra precaution */ |
280 | session->kernel_session = NULL; | |
fac6795d | 281 | } |
fac6795d DG |
282 | } |
283 | ||
099e26bd DG |
284 | /* |
285 | * Stop all threads by closing the thread quit pipe. | |
286 | */ | |
cf3af59e MD |
287 | static void stop_threads(void) |
288 | { | |
5eb91c98 DG |
289 | int ret; |
290 | ||
cf3af59e MD |
291 | /* Stopping all threads */ |
292 | DBG("Terminating all threads"); | |
54d01ffb | 293 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
294 | if (ret < 0) { |
295 | ERR("write error on thread quit pipe"); | |
296 | } | |
297 | ||
099e26bd DG |
298 | /* Dispatch thread */ |
299 | dispatch_thread_exit = 1; | |
300 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
301 | } |
302 | ||
fac6795d | 303 | /* |
d063d709 | 304 | * Cleanup the daemon |
fac6795d | 305 | */ |
cf3af59e | 306 | static void cleanup(void) |
fac6795d | 307 | { |
1d4b027a DG |
308 | int ret; |
309 | char *cmd; | |
af9737e9 | 310 | struct ltt_session *sess, *stmp; |
fac6795d | 311 | |
1d4b027a | 312 | DBG("Cleaning up"); |
e07ae692 | 313 | |
1d4b027a | 314 | /* <fun> */ |
2f50c8a3 | 315 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
316 | "Matthew, BEET driven development works!%c[%dm", |
317 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 318 | /* </fun> */ |
fac6795d | 319 | |
5eb91c98 DG |
320 | if (is_root) { |
321 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
322 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
323 | if (ret < 0) { | |
324 | ERR("asprintf failed. Something is really wrong!"); | |
325 | } | |
5461b305 | 326 | |
5eb91c98 DG |
327 | /* Remove lttng run directory */ |
328 | ret = system(cmd); | |
329 | if (ret < 0) { | |
330 | ERR("Unable to clean " LTTNG_RUNDIR); | |
331 | } | |
1d4b027a | 332 | } |
5461b305 | 333 | |
1d4b027a | 334 | DBG("Cleaning up all session"); |
fac6795d | 335 | |
b5541356 | 336 | /* Destroy session list mutex */ |
273ea72c DG |
337 | if (session_list_ptr != NULL) { |
338 | pthread_mutex_destroy(&session_list_ptr->lock); | |
339 | ||
340 | /* Cleanup ALL session */ | |
54d01ffb DG |
341 | cds_list_for_each_entry_safe(sess, stmp, |
342 | &session_list_ptr->head, list) { | |
273ea72c DG |
343 | teardown_kernel_session(sess); |
344 | // TODO complete session cleanup (including UST) | |
345 | } | |
346 | } | |
347 | ||
099e26bd | 348 | DBG("Closing all UST sockets"); |
56fff090 | 349 | ust_app_clean_list(); |
099e26bd | 350 | |
273ea72c | 351 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 352 | |
f3ed775e | 353 | DBG("Closing kernel fd"); |
1d4b027a | 354 | close(kernel_tracer_fd); |
ab147185 | 355 | |
2f50c8a3 DG |
356 | if (is_root) { |
357 | DBG("Unloading kernel modules"); | |
358 | modprobe_remove_kernel_modules(); | |
359 | } | |
b25a8868 | 360 | |
5eb91c98 DG |
361 | close(thread_quit_pipe[0]); |
362 | close(thread_quit_pipe[1]); | |
dab4c8a1 | 363 | |
3c6bae61 DG |
364 | /* OUTPUT BENCHMARK RESULTS */ |
365 | bench_init(); | |
366 | ||
62d53818 DG |
367 | if (getenv("BENCH_UST_NOTIFY")) { |
368 | bench_print_ust_notification(); | |
369 | } | |
370 | ||
371 | if (getenv("BENCH_UST_REGISTER")) { | |
372 | bench_print_ust_register(); | |
373 | } | |
374 | ||
375 | if (getenv("BENCH_BOOT_PROCESS")) { | |
376 | bench_print_boot_process(); | |
377 | } | |
3c6bae61 DG |
378 | |
379 | bench_close(); | |
380 | /* END BENCHMARK */ | |
fac6795d DG |
381 | } |
382 | ||
e065084a | 383 | /* |
d063d709 | 384 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 385 | * |
d063d709 | 386 | * Return lttcomm error code. |
e065084a DG |
387 | */ |
388 | static int send_unix_sock(int sock, void *buf, size_t len) | |
389 | { | |
390 | /* Check valid length */ | |
391 | if (len <= 0) { | |
392 | return -1; | |
393 | } | |
394 | ||
395 | return lttcomm_send_unix_sock(sock, buf, len); | |
396 | } | |
397 | ||
5461b305 | 398 | /* |
d063d709 | 399 | * Free memory of a command context structure. |
5461b305 | 400 | */ |
a2fb29a5 | 401 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 402 | { |
a2fb29a5 DG |
403 | DBG("Clean command context structure"); |
404 | if (*cmd_ctx) { | |
405 | if ((*cmd_ctx)->llm) { | |
406 | free((*cmd_ctx)->llm); | |
5461b305 | 407 | } |
a2fb29a5 DG |
408 | if ((*cmd_ctx)->lsm) { |
409 | free((*cmd_ctx)->lsm); | |
5461b305 | 410 | } |
a2fb29a5 DG |
411 | free(*cmd_ctx); |
412 | *cmd_ctx = NULL; | |
5461b305 DG |
413 | } |
414 | } | |
415 | ||
f3ed775e | 416 | /* |
d063d709 | 417 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 418 | */ |
54d01ffb DG |
419 | static int send_kconsumerd_channel_fds(int sock, |
420 | struct ltt_kernel_channel *channel) | |
f3ed775e DG |
421 | { |
422 | int ret; | |
423 | size_t nb_fd; | |
424 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
425 | struct lttcomm_kconsumerd_header lkh; |
426 | struct lttcomm_kconsumerd_msg lkm; | |
427 | ||
54d01ffb DG |
428 | DBG("Sending fds of channel %s to kernel consumer", |
429 | channel->channel->name); | |
7a485870 DG |
430 | |
431 | nb_fd = channel->stream_count; | |
f3ed775e DG |
432 | |
433 | /* Setup header */ | |
7a485870 | 434 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
435 | lkh.cmd_type = ADD_STREAM; |
436 | ||
437 | DBG("Sending kconsumerd header"); | |
438 | ||
54d01ffb DG |
439 | ret = lttcomm_send_unix_sock(sock, &lkh, |
440 | sizeof(struct lttcomm_kconsumerd_header)); | |
f3ed775e DG |
441 | if (ret < 0) { |
442 | perror("send kconsumerd header"); | |
443 | goto error; | |
444 | } | |
445 | ||
7a485870 DG |
446 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
447 | if (stream->fd != 0) { | |
f3ed775e DG |
448 | lkm.fd = stream->fd; |
449 | lkm.state = stream->state; | |
7a485870 | 450 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 451 | lkm.output = channel->channel->attr.output; |
f3ed775e | 452 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 453 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
454 | |
455 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
456 | ||
54d01ffb DG |
457 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, |
458 | &lkm.fd, 1, sizeof(lkm)); | |
f3ed775e DG |
459 | if (ret < 0) { |
460 | perror("send kconsumerd fd"); | |
461 | goto error; | |
462 | } | |
463 | } | |
464 | } | |
465 | ||
7a485870 | 466 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
467 | |
468 | return 0; | |
469 | ||
470 | error: | |
471 | return ret; | |
472 | } | |
473 | ||
474 | /* | |
d063d709 | 475 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 476 | */ |
d9800920 | 477 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
478 | { |
479 | int ret; | |
480 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
481 | struct lttcomm_kconsumerd_header lkh; |
482 | struct lttcomm_kconsumerd_msg lkm; | |
483 | ||
484 | /* Setup header */ | |
485 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
486 | lkh.cmd_type = ADD_STREAM; | |
487 | ||
488 | DBG("Sending kconsumerd header for metadata"); | |
489 | ||
54d01ffb DG |
490 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, |
491 | sizeof(struct lttcomm_kconsumerd_header)); | |
7a485870 DG |
492 | if (ret < 0) { |
493 | perror("send kconsumerd header"); | |
494 | goto error; | |
495 | } | |
496 | ||
497 | DBG("Sending metadata stream fd"); | |
498 | ||
d9800920 DG |
499 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
500 | if (session->consumer_fd == 0) { | |
501 | session->consumer_fd = kconsumerd_cmd_sock; | |
502 | } | |
503 | ||
7a485870 DG |
504 | if (session->metadata_stream_fd != 0) { |
505 | /* Send metadata stream fd first */ | |
506 | lkm.fd = session->metadata_stream_fd; | |
507 | lkm.state = ACTIVE_FD; | |
508 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 509 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 510 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 511 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 512 | |
54d01ffb DG |
513 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, |
514 | &lkm.fd, 1, sizeof(lkm)); | |
7a485870 DG |
515 | if (ret < 0) { |
516 | perror("send kconsumerd fd"); | |
517 | goto error; | |
518 | } | |
519 | } | |
f3ed775e | 520 | |
f3ed775e | 521 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 522 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 523 | if (ret < 0) { |
7a485870 | 524 | goto error; |
f3ed775e DG |
525 | } |
526 | } | |
527 | ||
7a485870 DG |
528 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
529 | ||
f3ed775e DG |
530 | return 0; |
531 | ||
532 | error: | |
533 | return ret; | |
534 | } | |
535 | ||
fac6795d | 536 | /* |
0fdd1e2c | 537 | * Notify UST applications using the shm mmap futex. |
fac6795d | 538 | */ |
0fdd1e2c | 539 | static int notify_ust_apps(int active) |
fac6795d | 540 | { |
0fdd1e2c | 541 | char *wait_shm_mmap; |
fac6795d | 542 | |
0fdd1e2c | 543 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 544 | |
62d53818 DG |
545 | tracepoint(ust_notify_apps_start); |
546 | ||
0fdd1e2c DG |
547 | /* See shm.c for this call implying mmap, shm and futex calls */ |
548 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
549 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
550 | goto error; |
551 | } | |
552 | ||
0fdd1e2c DG |
553 | /* Wake waiting process */ |
554 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
555 | ||
62d53818 DG |
556 | tracepoint(ust_notify_apps_stop); |
557 | ||
0fdd1e2c DG |
558 | /* Apps notified successfully */ |
559 | return 0; | |
fac6795d DG |
560 | |
561 | error: | |
0fdd1e2c | 562 | return -1; |
fac6795d DG |
563 | } |
564 | ||
e065084a | 565 | /* |
d063d709 DG |
566 | * Setup the outgoing data buffer for the response (llm) by allocating the |
567 | * right amount of memory and copying the original information from the lsm | |
568 | * structure. | |
ca95a216 | 569 | * |
d063d709 | 570 | * Return total size of the buffer pointed by buf. |
ca95a216 | 571 | */ |
5461b305 | 572 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 573 | { |
f3ed775e | 574 | int ret, buf_size; |
ca95a216 | 575 | |
f3ed775e | 576 | buf_size = size; |
5461b305 DG |
577 | |
578 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
579 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 580 | perror("malloc"); |
5461b305 | 581 | ret = -ENOMEM; |
ca95a216 DG |
582 | goto error; |
583 | } | |
584 | ||
5461b305 DG |
585 | /* Copy common data */ |
586 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 587 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 588 | |
5461b305 DG |
589 | cmd_ctx->llm->data_size = size; |
590 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
591 | ||
ca95a216 DG |
592 | return buf_size; |
593 | ||
594 | error: | |
595 | return ret; | |
596 | } | |
597 | ||
7a485870 | 598 | /* |
5eb91c98 | 599 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 600 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 601 | */ |
5eb91c98 | 602 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 603 | { |
5eb91c98 | 604 | int ret; |
7a485870 DG |
605 | struct ltt_session *session; |
606 | struct ltt_kernel_channel *channel; | |
607 | ||
5eb91c98 | 608 | DBG("Updating kernel poll set"); |
7a485870 | 609 | |
54d01ffb | 610 | session_lock_list(); |
b5541356 | 611 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 612 | session_lock(session); |
7a485870 | 613 | if (session->kernel_session == NULL) { |
54d01ffb | 614 | session_unlock(session); |
7a485870 DG |
615 | continue; |
616 | } | |
7a485870 | 617 | |
54d01ffb DG |
618 | cds_list_for_each_entry(channel, |
619 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
620 | /* Add channel fd to the kernel poll set */ |
621 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
622 | if (ret < 0) { | |
54d01ffb | 623 | session_unlock(session); |
5eb91c98 DG |
624 | goto error; |
625 | } | |
626 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 627 | } |
54d01ffb | 628 | session_unlock(session); |
7a485870 | 629 | } |
54d01ffb | 630 | session_unlock_list(); |
7a485870 | 631 | |
5eb91c98 | 632 | return 0; |
7a485870 DG |
633 | |
634 | error: | |
54d01ffb | 635 | session_unlock_list(); |
7a485870 DG |
636 | return -1; |
637 | } | |
638 | ||
639 | /* | |
54d01ffb | 640 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 641 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 642 | * |
d063d709 | 643 | * Useful for CPU hotplug feature. |
7a485870 DG |
644 | */ |
645 | static int update_kernel_stream(int fd) | |
646 | { | |
647 | int ret = 0; | |
648 | struct ltt_session *session; | |
649 | struct ltt_kernel_channel *channel; | |
650 | ||
651 | DBG("Updating kernel streams for channel fd %d", fd); | |
652 | ||
54d01ffb | 653 | session_lock_list(); |
b5541356 | 654 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 655 | session_lock(session); |
7a485870 | 656 | if (session->kernel_session == NULL) { |
54d01ffb | 657 | session_unlock(session); |
7a485870 DG |
658 | continue; |
659 | } | |
d9800920 DG |
660 | |
661 | /* This is not suppose to be 0 but this is an extra security check */ | |
662 | if (session->kernel_session->consumer_fd == 0) { | |
663 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
664 | } | |
665 | ||
5eb91c98 DG |
666 | cds_list_for_each_entry(channel, |
667 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
668 | if (channel->fd == fd) { |
669 | DBG("Channel found, updating kernel streams"); | |
670 | ret = kernel_open_channel_stream(channel); | |
671 | if (ret < 0) { | |
b3c750d2 | 672 | goto error; |
7a485870 | 673 | } |
d9800920 | 674 | |
7a485870 | 675 | /* |
5eb91c98 DG |
676 | * Have we already sent fds to the consumer? If yes, it means |
677 | * that tracing is started so it is safe to send our updated | |
678 | * stream fds. | |
7a485870 DG |
679 | */ |
680 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
5eb91c98 DG |
681 | ret = send_kconsumerd_channel_fds( |
682 | session->kernel_session->consumer_fd, channel); | |
7a485870 | 683 | if (ret < 0) { |
b3c750d2 | 684 | goto error; |
7a485870 DG |
685 | } |
686 | } | |
b3c750d2 | 687 | goto error; |
7a485870 DG |
688 | } |
689 | } | |
54d01ffb | 690 | session_unlock(session); |
7a485870 | 691 | } |
54d01ffb | 692 | session_unlock_list(); |
b3c750d2 | 693 | return ret; |
7a485870 | 694 | |
b3c750d2 | 695 | error: |
54d01ffb DG |
696 | session_unlock(session); |
697 | session_unlock_list(); | |
7a485870 DG |
698 | return ret; |
699 | } | |
700 | ||
701 | /* | |
d063d709 | 702 | * This thread manage event coming from the kernel. |
7a485870 | 703 | * |
d063d709 DG |
704 | * Features supported in this thread: |
705 | * -) CPU Hotplug | |
7a485870 DG |
706 | */ |
707 | static void *thread_manage_kernel(void *data) | |
708 | { | |
5eb91c98 DG |
709 | int ret, i, pollfd, update_poll_flag = 1; |
710 | uint32_t revents, nb_fd; | |
7a485870 | 711 | char tmp; |
5eb91c98 | 712 | struct lttng_poll_event events; |
7a485870 | 713 | |
b25a8868 DG |
714 | tracepoint(sessiond_th_kern_start); |
715 | ||
7a485870 DG |
716 | DBG("Thread manage kernel started"); |
717 | ||
5eb91c98 DG |
718 | ret = create_thread_poll_set(&events, 2); |
719 | if (ret < 0) { | |
720 | goto error; | |
721 | } | |
722 | ||
723 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
724 | if (ret < 0) { | |
725 | goto error; | |
726 | } | |
727 | ||
7a485870 DG |
728 | while (1) { |
729 | if (update_poll_flag == 1) { | |
5f822d0a DG |
730 | /* |
731 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
732 | * quit pipe and the kernel pipe. | |
733 | */ | |
734 | events.nb_fd = 2; | |
735 | ||
5eb91c98 DG |
736 | ret = update_kernel_poll(&events); |
737 | if (ret < 0) { | |
7a485870 DG |
738 | goto error; |
739 | } | |
740 | update_poll_flag = 0; | |
741 | } | |
742 | ||
5eb91c98 DG |
743 | nb_fd = LTTNG_POLL_GETNB(&events); |
744 | ||
745 | DBG("Thread kernel polling on %d fds", nb_fd); | |
746 | ||
747 | /* Zeroed the poll events */ | |
748 | lttng_poll_reset(&events); | |
7a485870 | 749 | |
b25a8868 DG |
750 | tracepoint(sessiond_th_kern_poll); |
751 | ||
7a485870 | 752 | /* Poll infinite value of time */ |
5eb91c98 | 753 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 754 | if (ret < 0) { |
7a485870 DG |
755 | goto error; |
756 | } else if (ret == 0) { | |
757 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
758 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
759 | "This should not have happened! Continuing..."); | |
7a485870 DG |
760 | continue; |
761 | } | |
762 | ||
5eb91c98 DG |
763 | for (i = 0; i < nb_fd; i++) { |
764 | /* Fetch once the poll data */ | |
765 | revents = LTTNG_POLL_GETEV(&events, i); | |
766 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 767 | |
5eb91c98 DG |
768 | /* Thread quit pipe has been closed. Killing thread. */ |
769 | ret = check_thread_quit_pipe(pollfd, revents); | |
770 | if (ret) { | |
771 | goto error; | |
772 | } | |
7a485870 | 773 | |
5eb91c98 DG |
774 | /* Check for data on kernel pipe */ |
775 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
776 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
777 | update_poll_flag = 1; | |
778 | continue; | |
779 | } else { | |
780 | /* | |
781 | * New CPU detected by the kernel. Adding kernel stream to | |
782 | * kernel session and updating the kernel consumer | |
783 | */ | |
784 | if (revents & LPOLLIN) { | |
785 | ret = update_kernel_stream(pollfd); | |
786 | if (ret < 0) { | |
787 | continue; | |
788 | } | |
789 | break; | |
790 | /* | |
791 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
792 | * and unregister kernel stream at this point. | |
793 | */ | |
7a485870 | 794 | } |
7a485870 DG |
795 | } |
796 | } | |
797 | } | |
798 | ||
799 | error: | |
800 | DBG("Kernel thread dying"); | |
273ea72c DG |
801 | close(kernel_poll_pipe[0]); |
802 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
803 | |
804 | lttng_poll_clean(&events); | |
805 | ||
7a485870 DG |
806 | return NULL; |
807 | } | |
808 | ||
1d4b027a | 809 | /* |
d063d709 | 810 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
811 | */ |
812 | static void *thread_manage_kconsumerd(void *data) | |
813 | { | |
5eb91c98 DG |
814 | int sock = 0, i, ret, pollfd; |
815 | uint32_t revents, nb_fd; | |
1d4b027a | 816 | enum lttcomm_return_code code; |
5eb91c98 | 817 | struct lttng_poll_event events; |
1d4b027a | 818 | |
b25a8868 DG |
819 | tracepoint(sessiond_th_kcon_start); |
820 | ||
1d4b027a DG |
821 | DBG("[thread] Manage kconsumerd started"); |
822 | ||
823 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
824 | if (ret < 0) { | |
825 | goto error; | |
826 | } | |
827 | ||
5eb91c98 DG |
828 | /* |
829 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
830 | * Nothing more will be added to this poll set. | |
831 | */ | |
832 | ret = create_thread_poll_set(&events, 2); | |
833 | if (ret < 0) { | |
834 | goto error; | |
835 | } | |
273ea72c | 836 | |
5eb91c98 DG |
837 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
838 | if (ret < 0) { | |
839 | goto error; | |
840 | } | |
273ea72c | 841 | |
5eb91c98 | 842 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 843 | |
b25a8868 DG |
844 | tracepoint(sessiond_th_kcon_poll); |
845 | ||
273ea72c | 846 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 847 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 848 | if (ret < 0) { |
273ea72c DG |
849 | goto error; |
850 | } | |
851 | ||
5eb91c98 DG |
852 | for (i = 0; i < nb_fd; i++) { |
853 | /* Fetch once the poll data */ | |
854 | revents = LTTNG_POLL_GETEV(&events, i); | |
855 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
856 | ||
857 | /* Thread quit pipe has been closed. Killing thread. */ | |
858 | ret = check_thread_quit_pipe(pollfd, revents); | |
859 | if (ret) { | |
860 | goto error; | |
861 | } | |
862 | ||
863 | /* Event on the registration socket */ | |
864 | if (pollfd == kconsumerd_err_sock) { | |
865 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
866 | ERR("Kconsumerd err socket poll error"); | |
867 | goto error; | |
868 | } | |
869 | } | |
273ea72c DG |
870 | } |
871 | ||
1d4b027a DG |
872 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
873 | if (sock < 0) { | |
874 | goto error; | |
875 | } | |
876 | ||
712ea556 | 877 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
878 | ret = lttcomm_recv_unix_sock(sock, &code, |
879 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
880 | if (ret <= 0) { |
881 | goto error; | |
882 | } | |
883 | ||
884 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
54d01ffb DG |
885 | kconsumerd_cmd_sock = |
886 | lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
1d4b027a | 887 | if (kconsumerd_cmd_sock < 0) { |
712ea556 | 888 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
889 | perror("kconsumerd connect"); |
890 | goto error; | |
891 | } | |
892 | /* Signal condition to tell that the kconsumerd is ready */ | |
893 | sem_post(&kconsumerd_sem); | |
894 | DBG("Kconsumerd command socket ready"); | |
895 | } else { | |
6f61d021 | 896 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
897 | lttcomm_get_readable_code(-code)); |
898 | goto error; | |
899 | } | |
900 | ||
54d01ffb | 901 | /* Remove the kconsumerd error sock since we've established a connexion */ |
5eb91c98 | 902 | ret = lttng_poll_del(&events, kconsumerd_err_sock); |
72079cae | 903 | if (ret < 0) { |
72079cae DG |
904 | goto error; |
905 | } | |
906 | ||
5eb91c98 DG |
907 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
908 | if (ret < 0) { | |
72079cae | 909 | goto error; |
5eb91c98 DG |
910 | } |
911 | ||
912 | /* Update number of fd */ | |
913 | nb_fd = LTTNG_POLL_GETNB(&events); | |
914 | ||
915 | /* Inifinite blocking call, waiting for transmission */ | |
916 | ret = lttng_poll_wait(&events, -1); | |
917 | if (ret < 0) { | |
72079cae DG |
918 | goto error; |
919 | } | |
920 | ||
5eb91c98 DG |
921 | for (i = 0; i < nb_fd; i++) { |
922 | /* Fetch once the poll data */ | |
923 | revents = LTTNG_POLL_GETEV(&events, i); | |
924 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
925 | ||
926 | /* Thread quit pipe has been closed. Killing thread. */ | |
927 | ret = check_thread_quit_pipe(pollfd, revents); | |
928 | if (ret) { | |
929 | goto error; | |
930 | } | |
931 | ||
932 | /* Event on the kconsumerd socket */ | |
933 | if (pollfd == sock) { | |
934 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
935 | ERR("Kconsumerd err socket second poll error"); | |
936 | goto error; | |
937 | } | |
938 | } | |
939 | } | |
940 | ||
712ea556 | 941 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
942 | ret = lttcomm_recv_unix_sock(sock, &code, |
943 | sizeof(enum lttcomm_return_code)); | |
712ea556 DG |
944 | if (ret <= 0) { |
945 | ERR("Kconsumerd closed the command socket"); | |
946 | goto error; | |
6f61d021 | 947 | } |
1d4b027a | 948 | |
712ea556 DG |
949 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
950 | ||
1d4b027a | 951 | error: |
6f61d021 | 952 | DBG("Kconsumerd thread dying"); |
5eb91c98 DG |
953 | close(kconsumerd_err_sock); |
954 | close(kconsumerd_cmd_sock); | |
955 | close(sock); | |
273ea72c DG |
956 | |
957 | unlink(kconsumerd_err_unix_sock_path); | |
958 | unlink(kconsumerd_cmd_unix_sock_path); | |
273ea72c | 959 | kconsumerd_pid = 0; |
0177d773 | 960 | |
5eb91c98 | 961 | lttng_poll_clean(&events); |
0177d773 | 962 | |
5eb91c98 | 963 | return NULL; |
099e26bd DG |
964 | } |
965 | ||
099e26bd DG |
966 | /* |
967 | * This thread manage application communication. | |
1d4b027a DG |
968 | */ |
969 | static void *thread_manage_apps(void *data) | |
099e26bd | 970 | { |
5eb91c98 DG |
971 | int i, ret, pollfd; |
972 | uint32_t revents, nb_fd; | |
099e26bd | 973 | struct ust_command ust_cmd; |
5eb91c98 | 974 | struct lttng_poll_event events; |
099e26bd | 975 | |
85c434ee DG |
976 | tracepoint(sessiond_th_apps_start); |
977 | ||
099e26bd DG |
978 | DBG("[thread] Manage application started"); |
979 | ||
5eb91c98 DG |
980 | ret = create_thread_poll_set(&events, 2); |
981 | if (ret < 0) { | |
982 | goto error; | |
983 | } | |
099e26bd | 984 | |
5eb91c98 DG |
985 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
986 | if (ret < 0) { | |
987 | goto error; | |
988 | } | |
099e26bd | 989 | |
5eb91c98 DG |
990 | while (1) { |
991 | /* Zeroed the events structure */ | |
992 | lttng_poll_reset(&events); | |
0177d773 | 993 | |
5eb91c98 | 994 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
995 | |
996 | DBG("Apps thread polling on %d fds", nb_fd); | |
997 | ||
85c434ee DG |
998 | tracepoint(sessiond_th_apps_poll); |
999 | ||
099e26bd | 1000 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1001 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1002 | if (ret < 0) { |
099e26bd DG |
1003 | goto error; |
1004 | } | |
1005 | ||
5eb91c98 DG |
1006 | for (i = 0; i < nb_fd; i++) { |
1007 | /* Fetch once the poll data */ | |
1008 | revents = LTTNG_POLL_GETEV(&events, i); | |
1009 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1010 | ||
1011 | /* Thread quit pipe has been closed. Killing thread. */ | |
1012 | ret = check_thread_quit_pipe(pollfd, revents); | |
1013 | if (ret) { | |
099e26bd | 1014 | goto error; |
5eb91c98 | 1015 | } |
62d53818 | 1016 | |
5eb91c98 DG |
1017 | /* Inspect the apps cmd pipe */ |
1018 | if (pollfd == apps_cmd_pipe[0]) { | |
1019 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1020 | ERR("Apps command pipe error"); | |
0177d773 | 1021 | goto error; |
5eb91c98 | 1022 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1023 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1024 | /* Empty pipe */ |
1025 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1026 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1027 | perror("read apps cmd pipe"); | |
1028 | goto error; | |
1029 | } | |
a89c7d1b | 1030 | tracepoint(ust_register_read_stop); |
099e26bd | 1031 | |
a89c7d1b | 1032 | tracepoint(ust_register_add_start); |
5eb91c98 | 1033 | /* Register applicaton to the session daemon */ |
56fff090 | 1034 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1035 | ust_cmd.sock); |
5eb91c98 DG |
1036 | if (ret < 0) { |
1037 | /* Only critical ENOMEM error can be returned here */ | |
1038 | goto error; | |
1039 | } | |
a89c7d1b | 1040 | tracepoint(ust_register_add_stop); |
85c434ee | 1041 | |
a89c7d1b | 1042 | tracepoint(ust_register_done_start); |
5eb91c98 DG |
1043 | ret = ustctl_register_done(ust_cmd.sock); |
1044 | if (ret < 0) { | |
1045 | /* | |
1046 | * If the registration is not possible, we simply | |
1047 | * unregister the apps and continue | |
1048 | */ | |
56fff090 | 1049 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1050 | } else { |
1051 | /* | |
1052 | * We just need here to monitor the close of the UST | |
1053 | * socket and poll set monitor those by default. | |
1054 | */ | |
1055 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1056 | if (ret < 0) { | |
1057 | goto error; | |
1058 | } | |
1059 | ||
54d01ffb DG |
1060 | DBG("Apps with sock %d added to poll set", |
1061 | ust_cmd.sock); | |
5eb91c98 | 1062 | } |
a89c7d1b | 1063 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1064 | break; |
0177d773 | 1065 | } |
5eb91c98 DG |
1066 | } else { |
1067 | /* | |
54d01ffb DG |
1068 | * At this point, we know that a registered application made |
1069 | * the event at poll_wait. | |
5eb91c98 DG |
1070 | */ |
1071 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1072 | /* Removing from the poll set */ | |
1073 | ret = lttng_poll_del(&events, pollfd); | |
1074 | if (ret < 0) { | |
1075 | goto error; | |
1076 | } | |
099e26bd | 1077 | |
5eb91c98 | 1078 | /* Socket closed */ |
56fff090 | 1079 | ust_app_unregister(pollfd); |
5eb91c98 | 1080 | break; |
0177d773 | 1081 | } |
099e26bd DG |
1082 | } |
1083 | } | |
099e26bd DG |
1084 | } |
1085 | ||
1086 | error: | |
1087 | DBG("Application communication apps dying"); | |
1088 | close(apps_cmd_pipe[0]); | |
1089 | close(apps_cmd_pipe[1]); | |
1090 | ||
5eb91c98 | 1091 | lttng_poll_clean(&events); |
099e26bd DG |
1092 | |
1093 | return NULL; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * Dispatch request from the registration threads to the application | |
1098 | * communication thread. | |
1099 | */ | |
1100 | static void *thread_dispatch_ust_registration(void *data) | |
1101 | { | |
1102 | int ret; | |
1103 | struct cds_wfq_node *node; | |
1104 | struct ust_command *ust_cmd = NULL; | |
1105 | ||
85c434ee DG |
1106 | tracepoint(sessiond_th_dispatch_start); |
1107 | ||
099e26bd DG |
1108 | DBG("[thread] Dispatch UST command started"); |
1109 | ||
1110 | while (!dispatch_thread_exit) { | |
1111 | /* Atomically prepare the queue futex */ | |
1112 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1113 | ||
1114 | do { | |
85c434ee DG |
1115 | tracepoint(sessiond_th_dispatch_block); |
1116 | ||
099e26bd DG |
1117 | /* Dequeue command for registration */ |
1118 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1119 | if (node == NULL) { | |
1120 | DBG("Waked up but nothing in the UST command queue"); | |
1121 | /* Continue thread execution */ | |
1122 | break; | |
1123 | } | |
1124 | ||
62d53818 DG |
1125 | tracepoint(ust_dispatch_register_start); |
1126 | ||
099e26bd DG |
1127 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1128 | ||
2f50c8a3 DG |
1129 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1130 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1131 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1132 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1133 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1134 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1135 | /* |
1136 | * Inform apps thread of the new application registration. This | |
1137 | * call is blocking so we can be assured that the data will be read | |
1138 | * at some point in time or wait to the end of the world :) | |
1139 | */ | |
1140 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1141 | sizeof(struct ust_command)); | |
1142 | if (ret < 0) { | |
1143 | perror("write apps cmd pipe"); | |
1144 | if (errno == EBADF) { | |
1145 | /* | |
1146 | * We can't inform the application thread to process | |
1147 | * registration. We will exit or else application | |
1148 | * registration will not occur and tracing will never | |
1149 | * start. | |
1150 | */ | |
1151 | goto error; | |
1152 | } | |
1153 | } | |
1154 | free(ust_cmd); | |
1155 | } while (node != NULL); | |
1156 | ||
62d53818 DG |
1157 | tracepoint(ust_dispatch_register_stop); |
1158 | ||
099e26bd DG |
1159 | /* Futex wait on queue. Blocking call on futex() */ |
1160 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1161 | } | |
1162 | ||
1163 | error: | |
1164 | DBG("Dispatch thread dying"); | |
1165 | return NULL; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * This thread manage application registration. | |
1170 | */ | |
1171 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1172 | { |
5eb91c98 DG |
1173 | int sock = 0, i, ret, pollfd; |
1174 | uint32_t revents, nb_fd; | |
1175 | struct lttng_poll_event events; | |
099e26bd DG |
1176 | /* |
1177 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1178 | * freed in the manage apps thread. | |
1179 | */ | |
1180 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1181 | |
62d53818 | 1182 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1183 | |
099e26bd | 1184 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1185 | |
1186 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1187 | if (ret < 0) { | |
1188 | goto error; | |
1189 | } | |
1190 | ||
5eb91c98 DG |
1191 | /* |
1192 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1193 | * more will be added to this poll set. | |
1194 | */ | |
1195 | ret = create_thread_poll_set(&events, 2); | |
1196 | if (ret < 0) { | |
1197 | goto error; | |
1198 | } | |
273ea72c | 1199 | |
5eb91c98 DG |
1200 | /* Add the application registration socket */ |
1201 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1202 | if (ret < 0) { | |
1203 | goto error; | |
1204 | } | |
273ea72c | 1205 | |
1d4b027a | 1206 | /* Notify all applications to register */ |
0fdd1e2c DG |
1207 | ret = notify_ust_apps(1); |
1208 | if (ret < 0) { | |
1209 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1210 | "Execution continues but there might be problem for already\n" |
1211 | "running applications that wishes to register."); | |
0fdd1e2c | 1212 | } |
1d4b027a DG |
1213 | |
1214 | while (1) { | |
1215 | DBG("Accepting application registration"); | |
273ea72c | 1216 | |
62d53818 | 1217 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1218 | |
5eb91c98 DG |
1219 | nb_fd = LTTNG_POLL_GETNB(&events); |
1220 | ||
273ea72c | 1221 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1222 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1223 | if (ret < 0) { |
273ea72c DG |
1224 | goto error; |
1225 | } | |
1226 | ||
5eb91c98 DG |
1227 | for (i = 0; i < nb_fd; i++) { |
1228 | /* Fetch once the poll data */ | |
1229 | revents = LTTNG_POLL_GETEV(&events, i); | |
1230 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1231 | |
5eb91c98 DG |
1232 | /* Thread quit pipe has been closed. Killing thread. */ |
1233 | ret = check_thread_quit_pipe(pollfd, revents); | |
1234 | if (ret) { | |
90014c57 DG |
1235 | goto error; |
1236 | } | |
62d53818 | 1237 | |
5eb91c98 DG |
1238 | /* Event on the registration socket */ |
1239 | if (pollfd == apps_sock) { | |
1240 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1241 | ERR("Register apps socket poll error"); | |
1242 | goto error; | |
1243 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1244 | /* Registration starts here. Recording cycles */ |
1245 | tracepoint(ust_register_start); | |
1d4b027a | 1246 | |
5eb91c98 DG |
1247 | sock = lttcomm_accept_unix_sock(apps_sock); |
1248 | if (sock < 0) { | |
1249 | goto error; | |
1250 | } | |
099e26bd | 1251 | |
5eb91c98 DG |
1252 | /* Create UST registration command for enqueuing */ |
1253 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1254 | if (ust_cmd == NULL) { | |
1255 | perror("ust command malloc"); | |
1256 | goto error; | |
1257 | } | |
1d4b027a | 1258 | |
5eb91c98 DG |
1259 | /* |
1260 | * Using message-based transmissions to ensure we don't | |
1261 | * have to deal with partially received messages. | |
1262 | */ | |
1263 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1264 | sizeof(struct ust_register_msg)); | |
1265 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1266 | if (ret < 0) { | |
1267 | perror("lttcomm_recv_unix_sock register apps"); | |
1268 | } else { | |
1269 | ERR("Wrong size received on apps register"); | |
1270 | } | |
1271 | free(ust_cmd); | |
1272 | close(sock); | |
1273 | continue; | |
1274 | } | |
099e26bd | 1275 | |
5eb91c98 | 1276 | ust_cmd->sock = sock; |
099e26bd | 1277 | |
5eb91c98 DG |
1278 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1279 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1280 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1281 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1282 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1283 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1284 | |
5eb91c98 DG |
1285 | /* |
1286 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1287 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1288 | */ |
1289 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1290 | |
5eb91c98 DG |
1291 | /* |
1292 | * Wake the registration queue futex. Implicit memory | |
1293 | * barrier with the exchange in cds_wfq_enqueue. | |
1294 | */ | |
1295 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1296 | |
1297 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1298 | } |
1299 | } | |
90014c57 | 1300 | } |
1d4b027a DG |
1301 | } |
1302 | ||
1303 | error: | |
0fdd1e2c DG |
1304 | DBG("UST Registration thread dying"); |
1305 | ||
1306 | /* Notify that the registration thread is gone */ | |
1307 | notify_ust_apps(0); | |
1308 | ||
1309 | close(apps_sock); | |
1310 | close(sock); | |
273ea72c | 1311 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1312 | |
5eb91c98 DG |
1313 | lttng_poll_clean(&events); |
1314 | ||
1d4b027a DG |
1315 | return NULL; |
1316 | } | |
1317 | ||
8c0faa1d | 1318 | /* |
d063d709 DG |
1319 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1320 | * exec or it will fails. | |
8c0faa1d | 1321 | */ |
693bd40b | 1322 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1323 | { |
1324 | int ret; | |
1325 | ||
1326 | /* Setup semaphore */ | |
1327 | sem_init(&kconsumerd_sem, 0, 0); | |
1328 | ||
54d01ffb DG |
1329 | ret = pthread_create(&kconsumerd_thread, NULL, |
1330 | thread_manage_kconsumerd, (void *) NULL); | |
8c0faa1d DG |
1331 | if (ret != 0) { |
1332 | perror("pthread_create kconsumerd"); | |
1333 | goto error; | |
1334 | } | |
1335 | ||
693bd40b | 1336 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1337 | sem_wait(&kconsumerd_sem); |
1338 | ||
712ea556 DG |
1339 | if (kconsumerd_pid == 0) { |
1340 | ERR("Kconsumerd did not start"); | |
1341 | goto error; | |
1342 | } | |
1343 | ||
8c0faa1d DG |
1344 | return 0; |
1345 | ||
1346 | error: | |
712ea556 | 1347 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1348 | return ret; |
1349 | } | |
1350 | ||
d9800920 DG |
1351 | /* |
1352 | * Join kernel consumer thread | |
1353 | */ | |
cf3af59e MD |
1354 | static int join_kconsumerd_thread(void) |
1355 | { | |
1356 | void *status; | |
1357 | int ret; | |
1358 | ||
1359 | if (kconsumerd_pid != 0) { | |
1360 | ret = kill(kconsumerd_pid, SIGTERM); | |
1361 | if (ret) { | |
1362 | ERR("Error killing kconsumerd"); | |
1363 | return ret; | |
1364 | } | |
1365 | return pthread_join(kconsumerd_thread, &status); | |
1366 | } else { | |
1367 | return 0; | |
1368 | } | |
1369 | } | |
1370 | ||
8c0faa1d | 1371 | /* |
d063d709 | 1372 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1373 | * |
d063d709 | 1374 | * Return pid if successful else -1. |
8c0faa1d | 1375 | */ |
693bd40b | 1376 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1377 | { |
1378 | int ret; | |
1379 | pid_t pid; | |
53086306 | 1380 | const char *verbosity; |
8c0faa1d | 1381 | |
c49dc785 DG |
1382 | DBG("Spawning kconsumerd"); |
1383 | ||
8c0faa1d DG |
1384 | pid = fork(); |
1385 | if (pid == 0) { | |
1386 | /* | |
1387 | * Exec kconsumerd. | |
1388 | */ | |
31f73cc9 | 1389 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1390 | verbosity = "--verbose"; |
1391 | } else { | |
1392 | verbosity = "--quiet"; | |
1393 | } | |
54d01ffb DG |
1394 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", |
1395 | "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1396 | if (errno != 0) { |
1397 | perror("kernel start consumer exec"); | |
1398 | } | |
1399 | exit(EXIT_FAILURE); | |
1400 | } else if (pid > 0) { | |
1401 | ret = pid; | |
1402 | goto error; | |
1403 | } else { | |
1404 | perror("kernel start consumer fork"); | |
1405 | ret = -errno; | |
1406 | goto error; | |
1407 | } | |
1408 | ||
1409 | error: | |
1410 | return ret; | |
1411 | } | |
1412 | ||
693bd40b | 1413 | /* |
d063d709 | 1414 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1415 | */ |
1416 | static int start_kconsumerd(void) | |
1417 | { | |
1418 | int ret; | |
1419 | ||
693bd40b | 1420 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1421 | if (kconsumerd_pid != 0) { |
817153bb | 1422 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1423 | goto end; |
1424 | } | |
693bd40b | 1425 | |
c49dc785 DG |
1426 | ret = spawn_kconsumerd(); |
1427 | if (ret < 0) { | |
1428 | ERR("Spawning kconsumerd failed"); | |
1429 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1430 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1431 | goto error; | |
693bd40b | 1432 | } |
c49dc785 DG |
1433 | |
1434 | /* Setting up the global kconsumerd_pid */ | |
1435 | kconsumerd_pid = ret; | |
693bd40b DG |
1436 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1437 | ||
6f61d021 DG |
1438 | DBG("Kconsumerd pid %d", ret); |
1439 | ||
693bd40b | 1440 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1441 | ret = spawn_kconsumerd_thread(); |
1442 | if (ret < 0) { | |
1443 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1444 | goto error; |
1445 | } | |
1446 | ||
c49dc785 | 1447 | end: |
693bd40b DG |
1448 | return 0; |
1449 | ||
1450 | error: | |
1451 | return ret; | |
1452 | } | |
1453 | ||
b73401da | 1454 | /* |
d063d709 | 1455 | * modprobe_kernel_modules |
b73401da DG |
1456 | */ |
1457 | static int modprobe_kernel_modules(void) | |
1458 | { | |
ab147185 | 1459 | int ret = 0, i; |
b73401da DG |
1460 | char modprobe[256]; |
1461 | ||
ab147185 MD |
1462 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1463 | ret = snprintf(modprobe, sizeof(modprobe), | |
1464 | "/sbin/modprobe %s%s", | |
1465 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1466 | kernel_modules_list[i].name); | |
b73401da DG |
1467 | if (ret < 0) { |
1468 | perror("snprintf modprobe"); | |
1469 | goto error; | |
1470 | } | |
ab147185 | 1471 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1472 | ret = system(modprobe); |
ab147185 MD |
1473 | if (ret == -1) { |
1474 | ERR("Unable to launch modprobe for module %s", | |
1475 | kernel_modules_list[i].name); | |
1476 | } else if (kernel_modules_list[i].required | |
d9800920 | 1477 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1478 | ERR("Unable to load module %s", |
1479 | kernel_modules_list[i].name); | |
1480 | } else { | |
1481 | DBG("Modprobe successfully %s", | |
1482 | kernel_modules_list[i].name); | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | error: | |
1487 | return ret; | |
1488 | } | |
1489 | ||
b73401da | 1490 | /* |
d063d709 | 1491 | * mount_debugfs |
b73401da DG |
1492 | */ |
1493 | static int mount_debugfs(char *path) | |
1494 | { | |
1495 | int ret; | |
1496 | char *type = "debugfs"; | |
1497 | ||
996b65c8 | 1498 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1499 | if (ret < 0) { |
7272acf5 | 1500 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1501 | goto error; |
1502 | } | |
1503 | ||
1504 | ret = mount(type, path, type, 0, NULL); | |
1505 | if (ret < 0) { | |
7272acf5 | 1506 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1507 | goto error; |
1508 | } | |
1509 | ||
1510 | DBG("Mounted debugfs successfully at %s", path); | |
1511 | ||
1512 | error: | |
1513 | return ret; | |
1514 | } | |
1515 | ||
8c0faa1d | 1516 | /* |
d063d709 | 1517 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1518 | */ |
f3ed775e | 1519 | static void init_kernel_tracer(void) |
8c0faa1d | 1520 | { |
b73401da DG |
1521 | int ret; |
1522 | char *proc_mounts = "/proc/mounts"; | |
1523 | char line[256]; | |
684d34d2 | 1524 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1525 | FILE *fp; |
1526 | ||
1527 | /* Detect debugfs */ | |
1528 | fp = fopen(proc_mounts, "r"); | |
1529 | if (fp == NULL) { | |
1530 | ERR("Unable to probe %s", proc_mounts); | |
1531 | goto error; | |
1532 | } | |
1533 | ||
1534 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1535 | if (strstr(line, "debugfs") != NULL) { | |
1536 | /* Remove first string */ | |
1537 | strtok(line, " "); | |
1538 | /* Dup string here so we can reuse line later on */ | |
1539 | debugfs_path = strdup(strtok(NULL, " ")); | |
1540 | DBG("Got debugfs path : %s", debugfs_path); | |
1541 | break; | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | fclose(fp); | |
1546 | ||
1547 | /* Mount debugfs if needded */ | |
1548 | if (debugfs_path == NULL) { | |
1549 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1550 | if (ret < 0) { | |
1551 | perror("asprintf debugfs path"); | |
1552 | goto error; | |
1553 | } | |
1554 | ret = mount_debugfs(debugfs_path); | |
1555 | if (ret < 0) { | |
7272acf5 | 1556 | perror("Cannot mount debugfs"); |
b73401da DG |
1557 | goto error; |
1558 | } | |
1559 | } | |
1560 | ||
1561 | /* Modprobe lttng kernel modules */ | |
1562 | ret = modprobe_kernel_modules(); | |
1563 | if (ret < 0) { | |
1564 | goto error; | |
1565 | } | |
1566 | ||
1567 | /* Setup lttng kernel path */ | |
1568 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1569 | if (ret < 0) { | |
1570 | perror("asprintf lttng path"); | |
1571 | goto error; | |
1572 | } | |
1573 | ||
1574 | /* Open debugfs lttng */ | |
1575 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1576 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1577 | DBG("Failed to open %s", lttng_path); |
1578 | goto error; | |
8c0faa1d DG |
1579 | } |
1580 | ||
b73401da DG |
1581 | free(lttng_path); |
1582 | free(debugfs_path); | |
f3ed775e | 1583 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1584 | return; |
1585 | ||
1586 | error: | |
1587 | if (lttng_path) { | |
1588 | free(lttng_path); | |
1589 | } | |
1590 | if (debugfs_path) { | |
1591 | free(debugfs_path); | |
1592 | } | |
1593 | WARN("No kernel tracer available"); | |
1594 | kernel_tracer_fd = 0; | |
1595 | return; | |
f3ed775e | 1596 | } |
33a2b854 | 1597 | |
f3ed775e | 1598 | /* |
54d01ffb | 1599 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1600 | */ |
54d01ffb | 1601 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1602 | { |
f40799e8 | 1603 | int ret = 0; |
8c0faa1d | 1604 | |
f3ed775e | 1605 | if (session->kconsumer_fds_sent == 0) { |
d9800920 | 1606 | /* |
54d01ffb DG |
1607 | * Assign default kernel consumer socket if no consumer assigned to the |
1608 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1609 | * an extra security check. | |
d9800920 DG |
1610 | */ |
1611 | if (session->consumer_fd == 0) { | |
1612 | session->consumer_fd = kconsumerd_cmd_sock; | |
1613 | } | |
1614 | ||
1615 | ret = send_kconsumerd_fds(session); | |
f3ed775e | 1616 | if (ret < 0) { |
f3ed775e DG |
1617 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1618 | goto error; | |
1619 | } | |
1d4b027a | 1620 | |
f3ed775e DG |
1621 | session->kconsumer_fds_sent = 1; |
1622 | } | |
1d4b027a DG |
1623 | |
1624 | error: | |
1625 | return ret; | |
8c0faa1d DG |
1626 | } |
1627 | ||
0177d773 DG |
1628 | /* |
1629 | * Create an UST session and add it to the session ust list. | |
1630 | */ | |
44d3bd01 DG |
1631 | static int create_ust_session(struct ltt_session *session, |
1632 | struct lttng_domain *domain) | |
0177d773 | 1633 | { |
44d3bd01 | 1634 | int ret; |
13384287 | 1635 | struct ltt_ust_session *lus = NULL; |
56fff090 | 1636 | struct ust_app *app; |
44d3bd01 DG |
1637 | |
1638 | switch (domain->type) { | |
1639 | case LTTNG_DOMAIN_UST_PID: | |
56fff090 | 1640 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
1641 | if (app == NULL) { |
1642 | ret = LTTCOMM_APP_NOT_FOUND; | |
1643 | goto error; | |
1644 | } | |
1645 | break; | |
1646 | default: | |
13384287 | 1647 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1648 | goto error; |
1649 | } | |
0177d773 DG |
1650 | |
1651 | DBG("Creating UST session"); | |
1652 | ||
44d3bd01 | 1653 | lus = trace_ust_create_session(session->path, domain->attr.pid, domain); |
0177d773 | 1654 | if (lus == NULL) { |
44d3bd01 | 1655 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1656 | goto error; |
1657 | } | |
1658 | ||
1659 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1660 | geteuid(), allowed_group()); | |
1661 | if (ret < 0) { | |
1662 | if (ret != -EEXIST) { | |
1663 | ERR("Trace directory creation error"); | |
44d3bd01 | 1664 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1665 | goto error; |
1666 | } | |
1667 | } | |
1668 | ||
1669 | /* Create session on the UST tracer */ | |
44d3bd01 | 1670 | ret = ustctl_create_session(app->sock, lus); |
0177d773 | 1671 | if (ret < 0) { |
44d3bd01 | 1672 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1673 | goto error; |
1674 | } | |
1675 | ||
44d3bd01 DG |
1676 | cds_list_add(&lus->list, &session->ust_session_list.head); |
1677 | session->ust_session_list.count++; | |
1678 | ||
1679 | return LTTCOMM_OK; | |
0177d773 DG |
1680 | |
1681 | error: | |
1682 | free(lus); | |
1683 | return ret; | |
1684 | } | |
1685 | ||
333f285e | 1686 | /* |
d063d709 | 1687 | * Create a kernel tracer session then create the default channel. |
333f285e | 1688 | */ |
f3ed775e | 1689 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1690 | { |
f3ed775e | 1691 | int ret; |
f3ed775e DG |
1692 | |
1693 | DBG("Creating kernel session"); | |
1694 | ||
1695 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1696 | if (ret < 0) { | |
1697 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1698 | goto error; | |
333f285e DG |
1699 | } |
1700 | ||
d9800920 DG |
1701 | /* Set kernel consumer socket fd */ |
1702 | if (kconsumerd_cmd_sock) { | |
1703 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1704 | } | |
1705 | ||
63053e7c DG |
1706 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1707 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1708 | if (ret < 0) { |
996b65c8 | 1709 | if (ret != -EEXIST) { |
7a485870 DG |
1710 | ERR("Trace directory creation error"); |
1711 | goto error; | |
1712 | } | |
1713 | } | |
1714 | ||
f3ed775e DG |
1715 | error: |
1716 | return ret; | |
333f285e DG |
1717 | } |
1718 | ||
6c9cc2ab DG |
1719 | /* |
1720 | * Using the session list, filled a lttng_session array to send back to the | |
1721 | * client for session listing. | |
1722 | * | |
1723 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1724 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1725 | */ |
1726 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1727 | { | |
1728 | int i = 0; | |
1729 | struct ltt_session *session; | |
1730 | ||
1731 | DBG("Getting all available session"); | |
1732 | /* | |
1733 | * Iterate over session list and append data after the control struct in | |
1734 | * the buffer. | |
1735 | */ | |
1736 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1737 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1738 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1739 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1740 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1741 | i++; |
1742 | } | |
1743 | } | |
1744 | ||
9f19cc17 DG |
1745 | /* |
1746 | * Fill lttng_channel array of all channels. | |
1747 | */ | |
1748 | static void list_lttng_channels(struct ltt_session *session, | |
1749 | struct lttng_channel *channels) | |
1750 | { | |
1751 | int i = 0; | |
1752 | struct ltt_kernel_channel *kchan; | |
1753 | ||
1754 | DBG("Listing channels for session %s", session->name); | |
1755 | ||
1756 | /* Kernel channels */ | |
1757 | if (session->kernel_session != NULL) { | |
54d01ffb DG |
1758 | cds_list_for_each_entry(kchan, |
1759 | &session->kernel_session->channel_list.head, list) { | |
9f19cc17 DG |
1760 | /* Copy lttng_channel struct to array */ |
1761 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1762 | channels[i].enabled = kchan->enabled; | |
1763 | i++; | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | /* TODO: Missing UST listing */ | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Fill lttng_event array of all events in the channel. | |
1772 | */ | |
1773 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1774 | struct lttng_event *events) | |
1775 | { | |
1776 | /* | |
1777 | * TODO: This is ONLY kernel. Need UST support. | |
1778 | */ | |
1779 | int i = 0; | |
1780 | struct ltt_kernel_event *event; | |
1781 | ||
1782 | DBG("Listing events for channel %s", kchan->channel->name); | |
1783 | ||
1784 | /* Kernel channels */ | |
1785 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1786 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1787 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1788 | events[i].enabled = event->enabled; |
1789 | switch (event->event->instrumentation) { | |
1790 | case LTTNG_KERNEL_TRACEPOINT: | |
1791 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1792 | break; | |
1793 | case LTTNG_KERNEL_KPROBE: | |
1794 | case LTTNG_KERNEL_KRETPROBE: | |
1795 | events[i].type = LTTNG_EVENT_PROBE; | |
1796 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1797 | sizeof(struct lttng_kernel_kprobe)); | |
1798 | break; | |
1799 | case LTTNG_KERNEL_FUNCTION: | |
1800 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1801 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1802 | sizeof(struct lttng_kernel_function)); | |
1803 | break; | |
0133c199 MD |
1804 | case LTTNG_KERNEL_NOOP: |
1805 | events[i].type = LTTNG_EVENT_NOOP; | |
1806 | break; | |
a54bd42d MD |
1807 | case LTTNG_KERNEL_SYSCALL: |
1808 | events[i].type = LTTNG_EVENT_SYSCALL; | |
0133c199 | 1809 | break; |
7a3d1328 MD |
1810 | case LTTNG_KERNEL_ALL: |
1811 | assert(0); | |
1812 | break; | |
9f19cc17 DG |
1813 | } |
1814 | i++; | |
1815 | } | |
1816 | } | |
1817 | ||
fac6795d | 1818 | /* |
54d01ffb | 1819 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1820 | */ |
54d01ffb DG |
1821 | static int cmd_disable_channel(struct ltt_session *session, |
1822 | int domain, char *channel_name) | |
fac6795d | 1823 | { |
54d01ffb | 1824 | int ret; |
379473d2 | 1825 | |
54d01ffb DG |
1826 | switch (domain) { |
1827 | case LTTNG_DOMAIN_KERNEL: | |
1828 | ret = channel_kernel_disable(session->kernel_session, | |
1829 | channel_name); | |
1830 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1831 | goto error; |
1832 | } | |
54d01ffb DG |
1833 | |
1834 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 1835 | break; |
44d3bd01 DG |
1836 | case LTTNG_DOMAIN_UST_PID: |
1837 | break; | |
d0254c7c | 1838 | default: |
44d3bd01 | 1839 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 1840 | goto error; |
20fe2104 DG |
1841 | } |
1842 | ||
54d01ffb | 1843 | ret = LTTCOMM_OK; |
d65106b1 | 1844 | |
54d01ffb DG |
1845 | error: |
1846 | return ret; | |
1847 | } | |
1848 | ||
56fff090 DG |
1849 | /* |
1850 | * Copy channel from attributes and set it in the application channel list. | |
1851 | */ | |
1852 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, | |
1853 | struct lttng_channel *attr, struct ust_app *app) | |
1854 | { | |
1855 | int ret; | |
1856 | struct ltt_ust_channel *uchan, *new_chan; | |
1857 | ||
1858 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1859 | if (uchan == NULL) { | |
1860 | ret = LTTCOMM_FATAL; | |
1861 | goto error; | |
1862 | } | |
1863 | ||
1864 | new_chan = trace_ust_create_channel(attr, usess->path); | |
1865 | if (new_chan == NULL) { | |
1866 | PERROR("malloc ltt_ust_channel"); | |
1867 | ret = LTTCOMM_FATAL; | |
1868 | goto error; | |
1869 | } | |
1870 | ||
1871 | ret = channel_ust_copy(new_chan, uchan); | |
1872 | if (ret < 0) { | |
1873 | ret = LTTCOMM_FATAL; | |
1874 | goto error; | |
1875 | } | |
1876 | ||
1877 | /* Add channel to the ust app channel list */ | |
1878 | cds_list_add(&new_chan->list, &app->channels.head); | |
1879 | app->channels.count++; | |
1880 | ||
1881 | error: | |
1882 | return ret; | |
1883 | } | |
1884 | ||
54d01ffb DG |
1885 | /* |
1886 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1887 | */ | |
44d3bd01 DG |
1888 | static int cmd_enable_channel(struct ltt_session *session, |
1889 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
1890 | { |
1891 | int ret; | |
d65106b1 | 1892 | |
44d3bd01 DG |
1893 | switch (domain->type) { |
1894 | case LTTNG_DOMAIN_KERNEL: | |
1895 | { | |
1896 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 1897 | |
44d3bd01 DG |
1898 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1899 | session->kernel_session); | |
1900 | if (kchan == NULL) { | |
1901 | ret = channel_kernel_create(session->kernel_session, | |
1902 | attr, kernel_poll_pipe[1]); | |
1903 | } else { | |
1904 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1905 | } | |
1906 | ||
1907 | if (ret != LTTCOMM_OK) { | |
1908 | goto error; | |
1909 | } | |
1910 | ||
1911 | kernel_wait_quiescent(kernel_tracer_fd); | |
1912 | break; | |
1913 | } | |
1914 | case LTTNG_DOMAIN_UST_PID: | |
1915 | { | |
56fff090 DG |
1916 | int sock; |
1917 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 1918 | struct ltt_ust_session *usess; |
56fff090 | 1919 | struct ust_app *app; |
44d3bd01 DG |
1920 | |
1921 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
1922 | domain->attr.pid); | |
1923 | if (usess == NULL) { | |
1924 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
1925 | goto error; | |
1926 | } | |
1927 | ||
56fff090 | 1928 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
1929 | if (app == NULL) { |
1930 | ret = LTTCOMM_APP_NOT_FOUND; | |
1931 | goto error; | |
1932 | } | |
56fff090 | 1933 | sock = app->sock; |
44d3bd01 DG |
1934 | |
1935 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1936 | if (uchan == NULL) { | |
56fff090 | 1937 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 1938 | } else { |
56fff090 | 1939 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
1940 | } |
1941 | ||
1942 | if (ret != LTTCOMM_OK) { | |
1943 | goto error; | |
1944 | } | |
1945 | ||
56fff090 DG |
1946 | ret = copy_ust_channel_to_app(usess, attr, app); |
1947 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
1948 | goto error; |
1949 | } | |
1950 | ||
44d3bd01 DG |
1951 | DBG("UST channel %s created for app sock %d with pid %d", |
1952 | attr->name, app->sock, domain->attr.pid); | |
1953 | break; | |
1954 | } | |
1955 | default: | |
1956 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
1957 | goto error; | |
54d01ffb DG |
1958 | } |
1959 | ||
1960 | ret = LTTCOMM_OK; | |
1961 | ||
1962 | error: | |
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | /* | |
1967 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1968 | */ | |
1969 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
1970 | char *channel_name, char *event_name) | |
1971 | { | |
1972 | int ret; | |
1973 | struct ltt_kernel_channel *kchan; | |
1974 | ||
1975 | switch (domain) { | |
1976 | case LTTNG_DOMAIN_KERNEL: | |
1977 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1978 | session->kernel_session); | |
1979 | if (kchan == NULL) { | |
1980 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1981 | goto error; | |
d65106b1 DG |
1982 | } |
1983 | ||
7a3d1328 | 1984 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
1985 | if (ret != LTTCOMM_OK) { |
1986 | goto error; | |
1987 | } | |
1988 | ||
1989 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 1990 | break; |
54d01ffb DG |
1991 | default: |
1992 | /* TODO: Userspace tracing */ | |
1993 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1994 | goto error; | |
d65106b1 | 1995 | } |
26cc6b4e | 1996 | |
54d01ffb DG |
1997 | ret = LTTCOMM_OK; |
1998 | ||
1999 | error: | |
2000 | return ret; | |
2001 | } | |
2002 | ||
2003 | /* | |
2004 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2005 | */ | |
2006 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2007 | char *channel_name) | |
2008 | { | |
2009 | int ret; | |
2010 | struct ltt_kernel_channel *kchan; | |
2011 | ||
2012 | switch (domain) { | |
2013 | case LTTNG_DOMAIN_KERNEL: | |
2014 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2015 | session->kernel_session); | |
2016 | if (kchan == NULL) { | |
2017 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2018 | goto error; | |
26cc6b4e DG |
2019 | } |
2020 | ||
54d01ffb DG |
2021 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2022 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2023 | goto error; |
26cc6b4e DG |
2024 | } |
2025 | ||
54d01ffb | 2026 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2027 | break; |
54d01ffb DG |
2028 | default: |
2029 | /* TODO: Userspace tracing */ | |
2030 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2031 | goto error; | |
26cc6b4e | 2032 | } |
e953ef25 | 2033 | |
54d01ffb | 2034 | ret = LTTCOMM_OK; |
e953ef25 | 2035 | |
54d01ffb DG |
2036 | error: |
2037 | return ret; | |
2038 | } | |
f5177a38 | 2039 | |
54d01ffb DG |
2040 | /* |
2041 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2042 | */ | |
2043 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2044 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2045 | { | |
2046 | int ret; | |
f5177a38 | 2047 | |
54d01ffb DG |
2048 | switch (domain) { |
2049 | case LTTNG_DOMAIN_KERNEL: | |
2050 | /* Add kernel context to kernel tracer */ | |
2051 | ret = context_kernel_add(session->kernel_session, ctx, | |
2052 | event_name, channel_name); | |
2053 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2054 | goto error; |
e953ef25 DG |
2055 | } |
2056 | ||
e953ef25 | 2057 | break; |
54d01ffb DG |
2058 | default: |
2059 | /* TODO: Userspace tracing */ | |
2060 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2061 | goto error; | |
e953ef25 | 2062 | } |
950131af | 2063 | |
54d01ffb | 2064 | ret = LTTCOMM_OK; |
950131af | 2065 | |
54d01ffb DG |
2066 | error: |
2067 | return ret; | |
2068 | } | |
2069 | ||
2070 | /* | |
2071 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2072 | */ | |
2073 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2074 | char *channel_name, struct lttng_event *event) | |
2075 | { | |
2076 | int ret; | |
2077 | struct ltt_kernel_channel *kchan; | |
2078 | ||
2079 | switch (domain) { | |
2080 | case LTTNG_DOMAIN_KERNEL: | |
2081 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2082 | session->kernel_session); | |
2083 | if (kchan == NULL) { | |
2084 | /* This call will notify the kernel thread */ | |
44d3bd01 | 2085 | ret = channel_kernel_create(session->kernel_session, |
54d01ffb DG |
2086 | NULL, kernel_poll_pipe[1]); |
2087 | if (ret != LTTCOMM_OK) { | |
f5177a38 DG |
2088 | goto error; |
2089 | } | |
54d01ffb | 2090 | } |
950131af | 2091 | |
54d01ffb DG |
2092 | /* Get the newly created kernel channel pointer */ |
2093 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2094 | session->kernel_session); | |
2095 | if (kchan == NULL) { | |
2096 | /* This sould not happen... */ | |
2097 | ret = LTTCOMM_FATAL; | |
2098 | goto error; | |
2099 | } | |
f5177a38 | 2100 | |
7a3d1328 | 2101 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event); |
54d01ffb | 2102 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2103 | goto error; |
950131af DG |
2104 | } |
2105 | ||
54d01ffb | 2106 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2107 | break; |
54d01ffb DG |
2108 | default: |
2109 | /* TODO: Userspace tracing */ | |
2110 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2111 | goto error; | |
950131af | 2112 | } |
d36b8583 | 2113 | |
54d01ffb | 2114 | ret = LTTCOMM_OK; |
d36b8583 | 2115 | |
54d01ffb DG |
2116 | error: |
2117 | return ret; | |
2118 | } | |
7d29a247 | 2119 | |
54d01ffb DG |
2120 | /* |
2121 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2122 | */ | |
2123 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2124 | char *channel_name, int event_type) |
54d01ffb DG |
2125 | { |
2126 | int ret; | |
2127 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2128 | |
54d01ffb DG |
2129 | switch (domain) { |
2130 | case LTTNG_DOMAIN_KERNEL: | |
2131 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2132 | session->kernel_session); | |
2133 | if (kchan == NULL) { | |
2134 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2135 | ret = channel_kernel_create(session->kernel_session, NULL, |
2136 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2137 | if (ret != LTTCOMM_OK) { |
2138 | goto error; | |
d36b8583 | 2139 | } |
54d01ffb | 2140 | } |
0d0c377a | 2141 | |
54d01ffb DG |
2142 | /* Get the newly created kernel channel pointer */ |
2143 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2144 | session->kernel_session); | |
2145 | if (kchan == NULL) { | |
2146 | /* This sould not happen... */ | |
2147 | ret = LTTCOMM_FATAL; | |
2148 | goto error; | |
2149 | } | |
0fdd1e2c | 2150 | |
7a3d1328 MD |
2151 | switch (event_type) { |
2152 | case LTTNG_KERNEL_SYSCALL: | |
2153 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2154 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2155 | break; |
2156 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2157 | /* |
7a3d1328 MD |
2158 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2159 | * events already registered to the channel. | |
8c9ae521 | 2160 | */ |
7a3d1328 MD |
2161 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2162 | kchan, kernel_tracer_fd); | |
2163 | break; | |
2164 | case LTTNG_KERNEL_ALL: | |
2165 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2166 | ret = event_kernel_enable_all(session->kernel_session, |
2167 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2168 | break; |
2169 | default: | |
2170 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2171 | goto error; | |
8c9ae521 | 2172 | } |
54d01ffb | 2173 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2174 | goto error; |
d36b8583 DG |
2175 | } |
2176 | ||
54d01ffb | 2177 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2178 | break; |
54d01ffb DG |
2179 | default: |
2180 | /* TODO: Userspace tracing */ | |
2181 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2182 | goto error; | |
d36b8583 | 2183 | } |
f3ed775e | 2184 | |
54d01ffb DG |
2185 | ret = LTTCOMM_OK; |
2186 | ||
2187 | error: | |
2188 | return ret; | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2193 | */ | |
2194 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2195 | { | |
2196 | int ret; | |
2197 | ssize_t nb_events = 0; | |
2198 | ||
2199 | switch (domain) { | |
2200 | case LTTNG_DOMAIN_KERNEL: | |
2201 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2202 | if (nb_events < 0) { | |
2203 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2204 | goto error; | |
894be886 | 2205 | } |
54d01ffb DG |
2206 | break; |
2207 | default: | |
2208 | /* TODO: Userspace listing */ | |
2209 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2210 | goto error; | |
2211 | } | |
894be886 | 2212 | |
54d01ffb | 2213 | return nb_events; |
7d29a247 | 2214 | |
54d01ffb DG |
2215 | error: |
2216 | /* Return negative value to differentiate return code */ | |
2217 | return -ret; | |
2218 | } | |
b389abbe | 2219 | |
54d01ffb DG |
2220 | /* |
2221 | * Command LTTNG_START_TRACE processed by the client thread. | |
2222 | */ | |
2223 | static int cmd_start_trace(struct ltt_session *session) | |
2224 | { | |
2225 | int ret; | |
2226 | struct ltt_kernel_channel *kchan; | |
2227 | struct ltt_kernel_session *ksession; | |
b389abbe | 2228 | |
54d01ffb DG |
2229 | /* Short cut */ |
2230 | ksession = session->kernel_session; | |
5eb91c98 | 2231 | |
54d01ffb DG |
2232 | /* Kernel tracing */ |
2233 | if (ksession != NULL) { | |
2234 | /* Open kernel metadata */ | |
2235 | if (ksession->metadata == NULL) { | |
2236 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2237 | if (ret < 0) { | |
2238 | ret = LTTCOMM_KERN_META_FAIL; | |
2239 | goto error; | |
b389abbe | 2240 | } |
54d01ffb | 2241 | } |
7d29a247 | 2242 | |
54d01ffb DG |
2243 | /* Open kernel metadata stream */ |
2244 | if (ksession->metadata_stream_fd == 0) { | |
2245 | ret = kernel_open_metadata_stream(ksession); | |
2246 | if (ret < 0) { | |
2247 | ERR("Kernel create metadata stream failed"); | |
2248 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2249 | goto error; | |
2250 | } | |
2251 | } | |
2252 | ||
2253 | /* For each channel */ | |
2254 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2255 | if (kchan->stream_count == 0) { | |
2256 | ret = kernel_open_channel_stream(kchan); | |
2257 | if (ret < 0) { | |
2258 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2259 | goto error; |
2260 | } | |
54d01ffb DG |
2261 | /* Update the stream global counter */ |
2262 | ksession->stream_count_global += ret; | |
7d29a247 | 2263 | } |
54d01ffb DG |
2264 | } |
2265 | ||
2266 | /* Setup kernel consumer socket and send fds to it */ | |
2267 | ret = init_kernel_tracing(ksession); | |
2268 | if (ret < 0) { | |
2269 | ret = LTTCOMM_KERN_START_FAIL; | |
2270 | goto error; | |
2271 | } | |
2272 | ||
2273 | /* This start the kernel tracing */ | |
2274 | ret = kernel_start_session(ksession); | |
2275 | if (ret < 0) { | |
2276 | ret = LTTCOMM_KERN_START_FAIL; | |
2277 | goto error; | |
2278 | } | |
2279 | ||
2280 | /* Quiescent wait after starting trace */ | |
2281 | kernel_wait_quiescent(kernel_tracer_fd); | |
2282 | } | |
2283 | ||
2284 | /* TODO: Start all UST traces */ | |
2285 | ||
2286 | ret = LTTCOMM_OK; | |
2287 | ||
2288 | error: | |
2289 | return ret; | |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2294 | */ | |
2295 | static int cmd_stop_trace(struct ltt_session *session) | |
2296 | { | |
2297 | int ret; | |
2298 | struct ltt_kernel_channel *kchan; | |
2299 | struct ltt_kernel_session *ksession; | |
2300 | ||
2301 | /* Short cut */ | |
2302 | ksession = session->kernel_session; | |
2303 | ||
2304 | /* Kernel tracer */ | |
2305 | if (ksession != NULL) { | |
2306 | DBG("Stop kernel tracing"); | |
2307 | ||
2308 | /* Flush all buffers before stopping */ | |
2309 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2310 | if (ret < 0) { | |
2311 | ERR("Kernel metadata flush failed"); | |
2312 | } | |
f34daff7 | 2313 | |
54d01ffb DG |
2314 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2315 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2316 | if (ret < 0) { |
54d01ffb | 2317 | ERR("Kernel flush buffer error"); |
7d29a247 | 2318 | } |
54d01ffb | 2319 | } |
19e70852 | 2320 | |
54d01ffb DG |
2321 | ret = kernel_stop_session(ksession); |
2322 | if (ret < 0) { | |
2323 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2324 | goto error; |
f3ed775e | 2325 | } |
54d01ffb DG |
2326 | |
2327 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2328 | } |
54d01ffb DG |
2329 | |
2330 | /* TODO : User-space tracer */ | |
2331 | ||
2332 | ret = LTTCOMM_OK; | |
2333 | ||
2334 | error: | |
2335 | return ret; | |
2336 | } | |
2337 | ||
2338 | /* | |
2339 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2340 | */ | |
2341 | static int cmd_create_session(char *name, char *path) | |
2342 | { | |
2343 | int ret; | |
2344 | ||
2345 | ret = session_create(name, path); | |
2346 | if (ret != LTTCOMM_OK) { | |
2347 | goto error; | |
2348 | } | |
2349 | ||
2350 | ret = LTTCOMM_OK; | |
2351 | ||
2352 | error: | |
2353 | return ret; | |
2354 | } | |
2355 | ||
2356 | /* | |
2357 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2358 | */ | |
2359 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2360 | { | |
2361 | int ret; | |
2362 | ||
2363 | /* Clean kernel session teardown */ | |
2364 | teardown_kernel_session(session); | |
2365 | ||
2366 | /* | |
2367 | * Must notify the kernel thread here to update it's poll setin order | |
2368 | * to remove the channel(s)' fd just destroyed. | |
2369 | */ | |
2370 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2371 | if (ret < 0) { | |
2372 | perror("write kernel poll pipe"); | |
2373 | } | |
2374 | ||
271933a4 | 2375 | ret = session_destroy(session); |
54d01ffb DG |
2376 | |
2377 | return ret; | |
2378 | } | |
2379 | ||
2380 | /* | |
2381 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2382 | */ | |
2383 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2384 | { | |
2385 | int ret; | |
2386 | ||
2387 | switch (domain) { | |
2388 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2389 | { |
54d01ffb | 2390 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2391 | |
54d01ffb DG |
2392 | kcalibrate.type = calibrate->type; |
2393 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2394 | if (ret < 0) { |
54d01ffb DG |
2395 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2396 | goto error; | |
33a2b854 | 2397 | } |
54d01ffb DG |
2398 | break; |
2399 | } | |
2400 | default: | |
2401 | /* TODO: Userspace tracing */ | |
2402 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2403 | goto error; | |
2404 | } | |
33a2b854 | 2405 | |
54d01ffb | 2406 | ret = LTTCOMM_OK; |
33a2b854 | 2407 | |
54d01ffb DG |
2408 | error: |
2409 | return ret; | |
2410 | } | |
7d29a247 | 2411 | |
54d01ffb DG |
2412 | /* |
2413 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2414 | */ | |
2415 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2416 | char *sock_path) | |
2417 | { | |
2418 | int ret, sock; | |
b389abbe | 2419 | |
54d01ffb DG |
2420 | switch (domain) { |
2421 | case LTTNG_DOMAIN_KERNEL: | |
2422 | /* Can't register a consumer if there is already one */ | |
2423 | if (session->kernel_session->consumer_fd != 0) { | |
2424 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2425 | goto error; | |
2426 | } | |
2427 | ||
2428 | sock = lttcomm_connect_unix_sock(sock_path); | |
2429 | if (sock < 0) { | |
2430 | ret = LTTCOMM_CONNECT_FAIL; | |
2431 | goto error; | |
2432 | } | |
2433 | ||
2434 | session->kernel_session->consumer_fd = sock; | |
2435 | break; | |
2436 | default: | |
2437 | /* TODO: Userspace tracing */ | |
2438 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2439 | goto error; | |
2440 | } | |
2441 | ||
2442 | ret = LTTCOMM_OK; | |
2443 | ||
2444 | error: | |
2445 | return ret; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2450 | */ | |
2451 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2452 | struct lttng_domain **domains) | |
2453 | { | |
2454 | int ret; | |
2455 | ssize_t nb_dom = 0; | |
2456 | ||
2457 | if (session->kernel_session != NULL) { | |
2458 | nb_dom++; | |
2459 | } | |
2460 | ||
2461 | nb_dom += session->ust_session_list.count; | |
2462 | ||
2463 | *domains = malloc(nb_dom * sizeof(struct lttng_domain)); | |
2464 | if (*domains == NULL) { | |
2465 | ret = -LTTCOMM_FATAL; | |
2466 | goto error; | |
2467 | } | |
2468 | ||
2469 | (*domains)[0].type = LTTNG_DOMAIN_KERNEL; | |
2470 | ||
2471 | /* TODO: User-space tracer domain support */ | |
2472 | ||
2473 | return nb_dom; | |
2474 | ||
2475 | error: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | /* | |
2480 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2481 | */ | |
2482 | static ssize_t cmd_list_channels(struct ltt_session *session, | |
2483 | struct lttng_channel **channels) | |
2484 | { | |
2485 | int ret; | |
2486 | ssize_t nb_chan = 0; | |
2487 | ||
2488 | if (session->kernel_session != NULL) { | |
2489 | nb_chan += session->kernel_session->channel_count; | |
2490 | } | |
2491 | ||
2492 | *channels = malloc(nb_chan * sizeof(struct lttng_channel)); | |
2493 | if (*channels == NULL) { | |
2494 | ret = -LTTCOMM_FATAL; | |
2495 | goto error; | |
2496 | } | |
2497 | ||
2498 | list_lttng_channels(session, *channels); | |
2499 | ||
2500 | return nb_chan; | |
2501 | ||
2502 | error: | |
2503 | return ret; | |
2504 | } | |
2505 | ||
2506 | /* | |
2507 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2508 | */ | |
2509 | static ssize_t cmd_list_events(struct ltt_session *session, | |
2510 | char *channel_name, struct lttng_event **events) | |
2511 | { | |
2512 | int ret; | |
2513 | ssize_t nb_event = 0; | |
2514 | struct ltt_kernel_channel *kchan = NULL; | |
2515 | ||
2516 | if (session->kernel_session != NULL) { | |
2517 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2518 | session->kernel_session); | |
2519 | if (kchan == NULL) { | |
2520 | ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2521 | goto error; | |
2522 | } | |
2523 | nb_event += kchan->event_count; | |
2524 | } | |
2525 | ||
2526 | *events = malloc(nb_event * sizeof(struct lttng_event)); | |
2527 | if (*events == NULL) { | |
2528 | ret = -LTTCOMM_FATAL; | |
2529 | goto error; | |
2530 | } | |
2531 | ||
2532 | list_lttng_events(kchan, *events); | |
2533 | ||
2534 | /* TODO: User-space tracer support */ | |
2535 | ||
2536 | return nb_event; | |
2537 | ||
2538 | error: | |
2539 | return ret; | |
2540 | } | |
2541 | ||
2542 | /* | |
2543 | * Process the command requested by the lttng client within the command | |
2544 | * context structure. This function make sure that the return structure (llm) | |
2545 | * is set and ready for transmission before returning. | |
2546 | * | |
2547 | * Return any error encountered or 0 for success. | |
2548 | */ | |
2549 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2550 | { | |
2551 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2552 | int need_tracing_session = 1; |
54d01ffb DG |
2553 | |
2554 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2555 | ||
2556 | /* | |
2557 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2558 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2559 | * command. |
2560 | */ | |
2561 | switch(cmd_ctx->lsm->cmd_type) { | |
2562 | case LTTNG_LIST_SESSIONS: | |
2563 | case LTTNG_LIST_TRACEPOINTS: | |
2564 | case LTTNG_LIST_DOMAINS: | |
2565 | case LTTNG_LIST_CHANNELS: | |
2566 | case LTTNG_LIST_EVENTS: | |
2567 | break; | |
2568 | default: | |
2569 | /* Setup lttng message with no payload */ | |
2570 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2571 | if (ret < 0) { | |
2572 | /* This label does not try to unlock the session */ | |
2573 | goto init_setup_error; | |
2574 | } | |
2575 | } | |
2576 | ||
2577 | /* Commands that DO NOT need a session. */ | |
2578 | switch (cmd_ctx->lsm->cmd_type) { | |
2579 | case LTTNG_CALIBRATE: | |
2580 | case LTTNG_CREATE_SESSION: | |
2581 | case LTTNG_LIST_SESSIONS: | |
2582 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2583 | need_tracing_session = 0; |
54d01ffb DG |
2584 | break; |
2585 | default: | |
2586 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
2587 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
2588 | if (cmd_ctx->session == NULL) { | |
2589 | if (cmd_ctx->lsm->session.name != NULL) { | |
2590 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2591 | } else { | |
2592 | /* If no session name specified */ | |
2593 | ret = LTTCOMM_SELECT_SESS; | |
2594 | } | |
2595 | goto error; | |
2596 | } else { | |
2597 | /* Acquire lock for the session */ | |
2598 | session_lock(cmd_ctx->session); | |
2599 | } | |
2600 | break; | |
2601 | } | |
b389abbe | 2602 | |
54d01ffb DG |
2603 | /* |
2604 | * Check domain type for specific "pre-action". | |
2605 | */ | |
2606 | switch (cmd_ctx->lsm->domain.type) { | |
2607 | case LTTNG_DOMAIN_KERNEL: | |
2608 | /* Kernel tracer check */ | |
2609 | if (kernel_tracer_fd == 0) { | |
2610 | /* Basically, load kernel tracer modules */ | |
2611 | init_kernel_tracer(); | |
2612 | if (kernel_tracer_fd == 0) { | |
2613 | ret = LTTCOMM_KERN_NA; | |
2614 | goto error; | |
2615 | } | |
2616 | } | |
5eb91c98 | 2617 | |
54d01ffb | 2618 | /* Need a session for kernel command */ |
44d3bd01 | 2619 | if (need_tracing_session) { |
54d01ffb DG |
2620 | if (cmd_ctx->session->kernel_session == NULL) { |
2621 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2622 | if (ret < 0) { |
54d01ffb | 2623 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2624 | goto error; |
2625 | } | |
b389abbe | 2626 | } |
7d29a247 | 2627 | |
54d01ffb DG |
2628 | /* Start the kernel consumer daemon */ |
2629 | if (kconsumerd_pid == 0 && | |
2630 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
2631 | ret = start_kconsumerd(); | |
7d29a247 | 2632 | if (ret < 0) { |
54d01ffb DG |
2633 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2634 | goto error; | |
950131af | 2635 | } |
33a2b854 | 2636 | } |
0d0c377a | 2637 | } |
54d01ffb | 2638 | break; |
44d3bd01 DG |
2639 | case LTTNG_DOMAIN_UST_PID: |
2640 | { | |
2641 | struct ltt_ust_session *usess; | |
2642 | ||
2643 | if (need_tracing_session) { | |
2644 | usess = trace_ust_get_session_by_pid( | |
2645 | &cmd_ctx->session->ust_session_list, | |
2646 | cmd_ctx->lsm->domain.attr.pid); | |
2647 | if (usess == NULL) { | |
2648 | ret = create_ust_session(cmd_ctx->session, | |
2649 | &cmd_ctx->lsm->domain); | |
2650 | if (ret != LTTCOMM_OK) { | |
2651 | goto error; | |
2652 | } | |
2653 | } | |
2654 | } | |
2655 | break; | |
2656 | } | |
54d01ffb DG |
2657 | default: |
2658 | /* TODO Userspace tracer */ | |
2659 | break; | |
2660 | } | |
33a2b854 | 2661 | |
54d01ffb DG |
2662 | /* Process by command type */ |
2663 | switch (cmd_ctx->lsm->cmd_type) { | |
2664 | case LTTNG_ADD_CONTEXT: | |
2665 | { | |
2666 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2667 | cmd_ctx->lsm->u.context.channel_name, | |
2668 | cmd_ctx->lsm->u.context.event_name, | |
2669 | &cmd_ctx->lsm->u.context.ctx); | |
2670 | break; | |
2671 | } | |
2672 | case LTTNG_DISABLE_CHANNEL: | |
2673 | { | |
2674 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2675 | cmd_ctx->lsm->u.disable.channel_name); | |
2676 | break; | |
2677 | } | |
2678 | case LTTNG_DISABLE_EVENT: | |
2679 | { | |
2680 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2681 | cmd_ctx->lsm->u.disable.channel_name, | |
2682 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2683 | ret = LTTCOMM_OK; |
2684 | break; | |
2685 | } | |
54d01ffb DG |
2686 | case LTTNG_DISABLE_ALL_EVENT: |
2687 | { | |
2688 | DBG("Disabling all kernel event"); | |
2689 | ||
2690 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2691 | cmd_ctx->lsm->u.disable.channel_name); | |
2692 | break; | |
2693 | } | |
2694 | case LTTNG_ENABLE_CHANNEL: | |
2695 | { | |
44d3bd01 | 2696 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
2697 | &cmd_ctx->lsm->u.channel.chan); |
2698 | break; | |
2699 | } | |
2700 | case LTTNG_ENABLE_EVENT: | |
2701 | { | |
2702 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2703 | cmd_ctx->lsm->u.enable.channel_name, | |
2704 | &cmd_ctx->lsm->u.enable.event); | |
2705 | break; | |
2706 | } | |
2707 | case LTTNG_ENABLE_ALL_EVENT: | |
2708 | { | |
2709 | DBG("Enabling all kernel event"); | |
2710 | ||
2711 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
2712 | cmd_ctx->lsm->u.enable.channel_name, |
2713 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
2714 | break; |
2715 | } | |
052da939 | 2716 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2717 | { |
9f19cc17 | 2718 | struct lttng_event *events; |
54d01ffb | 2719 | ssize_t nb_events; |
052da939 | 2720 | |
54d01ffb DG |
2721 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2722 | if (nb_events < 0) { | |
2723 | ret = -nb_events; | |
2724 | goto error; | |
2ef84c95 DG |
2725 | } |
2726 | ||
2727 | /* | |
2728 | * Setup lttng message with payload size set to the event list size in | |
2729 | * bytes and then copy list into the llm payload. | |
2730 | */ | |
052da939 | 2731 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2732 | if (ret < 0) { |
052da939 | 2733 | free(events); |
2ef84c95 DG |
2734 | goto setup_error; |
2735 | } | |
2736 | ||
2737 | /* Copy event list into message payload */ | |
9f19cc17 | 2738 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2739 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2740 | |
9f19cc17 | 2741 | free(events); |
2ef84c95 DG |
2742 | |
2743 | ret = LTTCOMM_OK; | |
2744 | break; | |
2745 | } | |
f3ed775e | 2746 | case LTTNG_START_TRACE: |
8c0faa1d | 2747 | { |
54d01ffb | 2748 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2749 | break; |
2750 | } | |
f3ed775e | 2751 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2752 | { |
54d01ffb | 2753 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2754 | break; |
2755 | } | |
5e16da05 MD |
2756 | case LTTNG_CREATE_SESSION: |
2757 | { | |
3c6bae61 | 2758 | tracepoint(create_session_start); |
54d01ffb DG |
2759 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
2760 | cmd_ctx->lsm->session.path); | |
3c6bae61 | 2761 | tracepoint(create_session_end); |
5e16da05 MD |
2762 | break; |
2763 | } | |
2764 | case LTTNG_DESTROY_SESSION: | |
2765 | { | |
3c6bae61 | 2766 | tracepoint(destroy_session_start); |
54d01ffb DG |
2767 | ret = cmd_destroy_session(cmd_ctx->session, |
2768 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 2769 | tracepoint(destroy_session_end); |
5461b305 | 2770 | break; |
5e16da05 | 2771 | } |
9f19cc17 | 2772 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2773 | { |
54d01ffb DG |
2774 | ssize_t nb_dom; |
2775 | struct lttng_domain *domains; | |
5461b305 | 2776 | |
54d01ffb DG |
2777 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2778 | if (nb_dom < 0) { | |
2779 | ret = -nb_dom; | |
2780 | goto error; | |
ce3d728c | 2781 | } |
520ff687 | 2782 | |
54d01ffb | 2783 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2784 | if (ret < 0) { |
2785 | goto setup_error; | |
520ff687 | 2786 | } |
57167058 | 2787 | |
54d01ffb DG |
2788 | /* Copy event list into message payload */ |
2789 | memcpy(cmd_ctx->llm->payload, domains, | |
2790 | nb_dom * sizeof(struct lttng_domain)); | |
2791 | ||
2792 | free(domains); | |
5e16da05 | 2793 | |
5461b305 | 2794 | ret = LTTCOMM_OK; |
5e16da05 MD |
2795 | break; |
2796 | } | |
9f19cc17 | 2797 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2798 | { |
54d01ffb DG |
2799 | size_t nb_chan; |
2800 | struct lttng_channel *channels; | |
2801 | ||
2802 | nb_chan = cmd_list_channels(cmd_ctx->session, &channels); | |
2803 | if (nb_chan < 0) { | |
2804 | ret = -nb_chan; | |
2805 | goto error; | |
5461b305 | 2806 | } |
ca95a216 | 2807 | |
54d01ffb | 2808 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2809 | if (ret < 0) { |
2810 | goto setup_error; | |
2811 | } | |
9f19cc17 | 2812 | |
54d01ffb DG |
2813 | /* Copy event list into message payload */ |
2814 | memcpy(cmd_ctx->llm->payload, channels, | |
2815 | nb_chan * sizeof(struct lttng_channel)); | |
2816 | ||
2817 | free(channels); | |
9f19cc17 DG |
2818 | |
2819 | ret = LTTCOMM_OK; | |
5461b305 | 2820 | break; |
5e16da05 | 2821 | } |
9f19cc17 | 2822 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2823 | { |
54d01ffb | 2824 | size_t nb_event; |
684d34d2 | 2825 | struct lttng_event *events = NULL; |
9f19cc17 | 2826 | |
54d01ffb DG |
2827 | nb_event = cmd_list_events(cmd_ctx->session, |
2828 | cmd_ctx->lsm->u.list.channel_name, &events); | |
2829 | if (nb_event < 0) { | |
2830 | ret = -nb_event; | |
2831 | goto error; | |
5461b305 | 2832 | } |
ca95a216 | 2833 | |
54d01ffb | 2834 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2835 | if (ret < 0) { |
2836 | goto setup_error; | |
2837 | } | |
9f19cc17 | 2838 | |
54d01ffb DG |
2839 | /* Copy event list into message payload */ |
2840 | memcpy(cmd_ctx->llm->payload, events, | |
2841 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2842 | |
54d01ffb | 2843 | free(events); |
9f19cc17 DG |
2844 | |
2845 | ret = LTTCOMM_OK; | |
5461b305 | 2846 | break; |
5e16da05 MD |
2847 | } |
2848 | case LTTNG_LIST_SESSIONS: | |
2849 | { | |
54d01ffb | 2850 | session_lock_list(); |
5461b305 | 2851 | |
6c9cc2ab | 2852 | if (session_list_ptr->count == 0) { |
f3ed775e | 2853 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 2854 | session_unlock_list(); |
5461b305 | 2855 | goto error; |
57167058 | 2856 | } |
5e16da05 | 2857 | |
6c9cc2ab DG |
2858 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2859 | session_list_ptr->count); | |
5461b305 | 2860 | if (ret < 0) { |
54d01ffb | 2861 | session_unlock_list(); |
5461b305 | 2862 | goto setup_error; |
e065084a | 2863 | } |
5e16da05 | 2864 | |
6c9cc2ab DG |
2865 | /* Filled the session array */ |
2866 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2867 | ||
54d01ffb | 2868 | session_unlock_list(); |
5e16da05 | 2869 | |
5461b305 | 2870 | ret = LTTCOMM_OK; |
5e16da05 MD |
2871 | break; |
2872 | } | |
d0254c7c MD |
2873 | case LTTNG_CALIBRATE: |
2874 | { | |
54d01ffb DG |
2875 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2876 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2877 | break; |
2878 | } | |
d9800920 DG |
2879 | case LTTNG_REGISTER_CONSUMER: |
2880 | { | |
54d01ffb DG |
2881 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2882 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
2883 | break; |
2884 | } | |
5e16da05 | 2885 | default: |
5e16da05 | 2886 | ret = LTTCOMM_UND; |
5461b305 | 2887 | break; |
fac6795d DG |
2888 | } |
2889 | ||
5461b305 | 2890 | error: |
5461b305 DG |
2891 | if (cmd_ctx->llm == NULL) { |
2892 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2893 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2894 | goto setup_error; |
2895 | } | |
2896 | } | |
54d01ffb | 2897 | /* Set return code */ |
5461b305 | 2898 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2899 | setup_error: |
b5541356 | 2900 | if (cmd_ctx->session) { |
54d01ffb | 2901 | session_unlock(cmd_ctx->session); |
b5541356 | 2902 | } |
54d01ffb | 2903 | init_setup_error: |
8028d920 | 2904 | return ret; |
fac6795d DG |
2905 | } |
2906 | ||
1d4b027a | 2907 | /* |
d063d709 DG |
2908 | * This thread manage all clients request using the unix client socket for |
2909 | * communication. | |
1d4b027a DG |
2910 | */ |
2911 | static void *thread_manage_clients(void *data) | |
2912 | { | |
5eb91c98 DG |
2913 | int sock = 0, ret, i, pollfd; |
2914 | uint32_t revents, nb_fd; | |
273ea72c | 2915 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 2916 | struct lttng_poll_event events; |
1d4b027a | 2917 | |
b25a8868 DG |
2918 | tracepoint(sessiond_th_cli_start); |
2919 | ||
1d4b027a DG |
2920 | DBG("[thread] Manage client started"); |
2921 | ||
2922 | ret = lttcomm_listen_unix_sock(client_sock); | |
2923 | if (ret < 0) { | |
2924 | goto error; | |
2925 | } | |
2926 | ||
5eb91c98 DG |
2927 | /* |
2928 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2929 | * more will be added to this poll set. | |
2930 | */ | |
2931 | ret = create_thread_poll_set(&events, 2); | |
2932 | if (ret < 0) { | |
2933 | goto error; | |
2934 | } | |
273ea72c | 2935 | |
5eb91c98 DG |
2936 | /* Add the application registration socket */ |
2937 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2938 | if (ret < 0) { | |
2939 | goto error; | |
2940 | } | |
273ea72c | 2941 | |
bbd973c2 DG |
2942 | /* |
2943 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2944 | */ |
2945 | if (opt_sig_parent) { | |
2946 | kill(ppid, SIGCHLD); | |
2947 | } | |
2948 | ||
2949 | while (1) { | |
1d4b027a | 2950 | DBG("Accepting client command ..."); |
273ea72c | 2951 | |
b25a8868 DG |
2952 | tracepoint(sessiond_th_cli_poll); |
2953 | ||
5eb91c98 DG |
2954 | nb_fd = LTTNG_POLL_GETNB(&events); |
2955 | ||
273ea72c | 2956 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 2957 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 2958 | if (ret < 0) { |
273ea72c DG |
2959 | goto error; |
2960 | } | |
2961 | ||
5eb91c98 DG |
2962 | for (i = 0; i < nb_fd; i++) { |
2963 | /* Fetch once the poll data */ | |
2964 | revents = LTTNG_POLL_GETEV(&events, i); | |
2965 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2966 | ||
2967 | /* Thread quit pipe has been closed. Killing thread. */ | |
2968 | ret = check_thread_quit_pipe(pollfd, revents); | |
2969 | if (ret) { | |
2970 | goto error; | |
2971 | } | |
2972 | ||
2973 | /* Event on the registration socket */ | |
2974 | if (pollfd == client_sock) { | |
2975 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2976 | ERR("Client socket poll error"); | |
2977 | goto error; | |
2978 | } | |
2979 | } | |
273ea72c DG |
2980 | } |
2981 | ||
5eb91c98 DG |
2982 | DBG("Wait for client response"); |
2983 | ||
1d4b027a DG |
2984 | sock = lttcomm_accept_unix_sock(client_sock); |
2985 | if (sock < 0) { | |
2986 | goto error; | |
2987 | } | |
2988 | ||
2989 | /* Allocate context command to process the client request */ | |
2990 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
5eb91c98 DG |
2991 | if (cmd_ctx == NULL) { |
2992 | perror("malloc cmd_ctx"); | |
1d4b027a | 2993 | goto error; |
5eb91c98 | 2994 | } |
1d4b027a DG |
2995 | |
2996 | /* Allocate data buffer for reception */ | |
2997 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
5eb91c98 DG |
2998 | if (cmd_ctx->lsm == NULL) { |
2999 | perror("malloc cmd_ctx->lsm"); | |
3000 | goto error; | |
3001 | } | |
1d4b027a | 3002 | |
1d4b027a DG |
3003 | cmd_ctx->llm = NULL; |
3004 | cmd_ctx->session = NULL; | |
3005 | ||
3006 | /* | |
3007 | * Data is received from the lttng client. The struct | |
3008 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3009 | * the client. | |
3010 | */ | |
3011 | DBG("Receiving data from client ..."); | |
5eb91c98 DG |
3012 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
3013 | sizeof(struct lttcomm_session_msg)); | |
1d4b027a | 3014 | if (ret <= 0) { |
5eb91c98 DG |
3015 | DBG("Nothing recv() from client... continuing"); |
3016 | close(sock); | |
3017 | free(cmd_ctx); | |
1d4b027a DG |
3018 | continue; |
3019 | } | |
3020 | ||
5eb91c98 DG |
3021 | // TODO: Validate cmd_ctx including sanity check for |
3022 | // security purpose. | |
f7776ea7 | 3023 | |
1d4b027a DG |
3024 | /* |
3025 | * This function dispatch the work to the kernel or userspace tracer | |
3026 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3027 | * informations for the client. The command context struct contains | |
3028 | * everything this function may needs. | |
3029 | */ | |
3030 | ret = process_client_msg(cmd_ctx); | |
3031 | if (ret < 0) { | |
bbd973c2 | 3032 | /* |
5eb91c98 DG |
3033 | * TODO: Inform client somehow of the fatal error. At |
3034 | * this point, ret < 0 means that a malloc failed | |
3035 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 3036 | */ |
a2fb29a5 | 3037 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3038 | continue; |
3039 | } | |
3040 | ||
54d01ffb DG |
3041 | DBG("Sending response (size: %d, retcode: %s)", |
3042 | cmd_ctx->lttng_msg_size, | |
532d79a7 | 3043 | lttng_get_readable_code(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3044 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
3045 | if (ret < 0) { |
3046 | ERR("Failed to send data back to client"); | |
3047 | } | |
3048 | ||
a2fb29a5 | 3049 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
3050 | |
3051 | /* End of transmission */ | |
3052 | close(sock); | |
1d4b027a DG |
3053 | } |
3054 | ||
3055 | error: | |
273ea72c | 3056 | DBG("Client thread dying"); |
273ea72c | 3057 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3058 | close(client_sock); |
3059 | close(sock); | |
273ea72c | 3060 | |
5eb91c98 | 3061 | lttng_poll_clean(&events); |
a2fb29a5 | 3062 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3063 | return NULL; |
3064 | } | |
3065 | ||
3066 | ||
fac6795d DG |
3067 | /* |
3068 | * usage function on stderr | |
3069 | */ | |
3070 | static void usage(void) | |
3071 | { | |
b716ce68 | 3072 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3073 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3074 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3075 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3076 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3077 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
3078 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
3079 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3080 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3081 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3082 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3083 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 3084 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
3085 | } |
3086 | ||
3087 | /* | |
3088 | * daemon argument parsing | |
3089 | */ | |
3090 | static int parse_args(int argc, char **argv) | |
3091 | { | |
3092 | int c; | |
3093 | ||
3094 | static struct option long_options[] = { | |
3095 | { "client-sock", 1, 0, 'c' }, | |
3096 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
3097 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
3098 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 3099 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3100 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3101 | { "help", 0, 0, 'h' }, |
3102 | { "group", 1, 0, 'g' }, | |
3103 | { "version", 0, 0, 'V' }, | |
75462a81 | 3104 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3105 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 3106 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
3107 | { NULL, 0, 0, 0 } |
3108 | }; | |
3109 | ||
3110 | while (1) { | |
3111 | int option_index = 0; | |
54d01ffb DG |
3112 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", |
3113 | long_options, &option_index); | |
fac6795d DG |
3114 | if (c == -1) { |
3115 | break; | |
3116 | } | |
3117 | ||
3118 | switch (c) { | |
3119 | case 0: | |
3120 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3121 | if (optarg) { | |
3122 | fprintf(stderr, " with arg %s\n", optarg); | |
3123 | } | |
3124 | break; | |
b716ce68 | 3125 | case 'c': |
fac6795d DG |
3126 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3127 | break; | |
3128 | case 'a': | |
3129 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3130 | break; | |
3131 | case 'd': | |
3132 | opt_daemon = 1; | |
3133 | break; | |
3134 | case 'g': | |
3135 | opt_tracing_group = strdup(optarg); | |
3136 | break; | |
3137 | case 'h': | |
3138 | usage(); | |
3139 | exit(EXIT_FAILURE); | |
3140 | case 'V': | |
3141 | fprintf(stdout, "%s\n", VERSION); | |
3142 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3143 | case 'S': |
3144 | opt_sig_parent = 1; | |
3145 | break; | |
d6f42150 DG |
3146 | case 'E': |
3147 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3148 | break; | |
3149 | case 'C': | |
3150 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
3151 | break; | |
75462a81 DG |
3152 | case 'q': |
3153 | opt_quiet = 1; | |
3154 | break; | |
3f9947db | 3155 | case 'v': |
53086306 DG |
3156 | /* Verbose level can increase using multiple -v */ |
3157 | opt_verbose += 1; | |
3f9947db | 3158 | break; |
31f73cc9 MD |
3159 | case 'Z': |
3160 | opt_verbose_kconsumerd += 1; | |
3161 | break; | |
fac6795d DG |
3162 | default: |
3163 | /* Unknown option or other error. | |
3164 | * Error is printed by getopt, just return */ | |
3165 | return -1; | |
3166 | } | |
3167 | } | |
3168 | ||
3169 | return 0; | |
3170 | } | |
3171 | ||
3172 | /* | |
d063d709 | 3173 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3174 | * apps_sock - The communication socket for all UST apps. |
3175 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3176 | */ |
cf3af59e | 3177 | static int init_daemon_socket(void) |
fac6795d DG |
3178 | { |
3179 | int ret = 0; | |
3180 | mode_t old_umask; | |
3181 | ||
3182 | old_umask = umask(0); | |
3183 | ||
3184 | /* Create client tool unix socket */ | |
d6f42150 DG |
3185 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3186 | if (client_sock < 0) { | |
3187 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3188 | ret = -1; |
3189 | goto end; | |
3190 | } | |
3191 | ||
3192 | /* File permission MUST be 660 */ | |
3193 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3194 | if (ret < 0) { | |
d6f42150 | 3195 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3196 | perror("chmod"); |
3197 | goto end; | |
3198 | } | |
3199 | ||
3200 | /* Create the application unix socket */ | |
d6f42150 DG |
3201 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3202 | if (apps_sock < 0) { | |
3203 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3204 | ret = -1; |
3205 | goto end; | |
3206 | } | |
3207 | ||
d6f42150 | 3208 | /* File permission MUST be 666 */ |
54d01ffb DG |
3209 | ret = chmod(apps_unix_sock_path, |
3210 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3211 | if (ret < 0) { |
d6f42150 | 3212 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3213 | perror("chmod"); |
3214 | goto end; | |
3215 | } | |
3216 | ||
3217 | end: | |
3218 | umask(old_umask); | |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | /* | |
54d01ffb DG |
3223 | * Check if the global socket is available, and if a daemon is answering at the |
3224 | * other side. If yes, error is returned. | |
fac6795d | 3225 | */ |
cf3af59e | 3226 | static int check_existing_daemon(void) |
fac6795d | 3227 | { |
7d8234d9 | 3228 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3229 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3230 | return 0; |
099e26bd | 3231 | } |
54d01ffb | 3232 | |
7d8234d9 | 3233 | /* Is there anybody out there ? */ |
099e26bd | 3234 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3235 | return -EEXIST; |
099e26bd | 3236 | } else { |
7d8234d9 | 3237 | return 0; |
099e26bd | 3238 | } |
fac6795d DG |
3239 | } |
3240 | ||
fac6795d | 3241 | /* |
d063d709 | 3242 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3243 | * |
d063d709 DG |
3244 | * Race window between mkdir and chown is OK because we are going from more |
3245 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3246 | */ |
d6f42150 | 3247 | static int set_permissions(void) |
fac6795d DG |
3248 | { |
3249 | int ret; | |
996b65c8 | 3250 | gid_t gid; |
fac6795d | 3251 | |
996b65c8 MD |
3252 | gid = allowed_group(); |
3253 | if (gid < 0) { | |
a463f419 DG |
3254 | if (is_root) { |
3255 | WARN("No tracing group detected"); | |
3256 | ret = 0; | |
3257 | } else { | |
3258 | ERR("Missing tracing group. Aborting execution."); | |
3259 | ret = -1; | |
3260 | } | |
fac6795d DG |
3261 | goto end; |
3262 | } | |
3263 | ||
d6f42150 | 3264 | /* Set lttng run dir */ |
996b65c8 | 3265 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3266 | if (ret < 0) { |
3267 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3268 | perror("chown"); | |
3269 | } | |
3270 | ||
3271 | /* lttng client socket path */ | |
996b65c8 | 3272 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3273 | if (ret < 0) { |
d6f42150 DG |
3274 | ERR("Unable to set group on %s", client_unix_sock_path); |
3275 | perror("chown"); | |
3276 | } | |
3277 | ||
3278 | /* kconsumerd error socket path */ | |
996b65c8 | 3279 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
3280 | if (ret < 0) { |
3281 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
3282 | perror("chown"); |
3283 | } | |
3284 | ||
d6f42150 | 3285 | DBG("All permissions are set"); |
e07ae692 | 3286 | |
fac6795d DG |
3287 | end: |
3288 | return ret; | |
3289 | } | |
3290 | ||
7a485870 | 3291 | /* |
d063d709 | 3292 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3293 | */ |
3294 | static int create_kernel_poll_pipe(void) | |
3295 | { | |
3296 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3297 | } | |
3298 | ||
099e26bd DG |
3299 | /* |
3300 | * Create the application command pipe to wake thread_manage_apps. | |
3301 | */ | |
3302 | static int create_apps_cmd_pipe(void) | |
3303 | { | |
3304 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3305 | } | |
3306 | ||
d6f42150 | 3307 | /* |
d063d709 | 3308 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3309 | */ |
3310 | static int create_lttng_rundir(void) | |
3311 | { | |
3312 | int ret; | |
3313 | ||
3314 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3315 | if (ret < 0) { | |
b1f11e69 DG |
3316 | if (errno != EEXIST) { |
3317 | ERR("Unable to create " LTTNG_RUNDIR); | |
3318 | goto error; | |
3319 | } else { | |
3320 | ret = 0; | |
3321 | } | |
d6f42150 DG |
3322 | } |
3323 | ||
3324 | error: | |
3325 | return ret; | |
3326 | } | |
3327 | ||
3328 | /* | |
d063d709 DG |
3329 | * Setup sockets and directory needed by the kconsumerd communication with the |
3330 | * session daemon. | |
d6f42150 DG |
3331 | */ |
3332 | static int set_kconsumerd_sockets(void) | |
3333 | { | |
3334 | int ret; | |
3335 | ||
3336 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
54d01ffb DG |
3337 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, |
3338 | KCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3339 | } |
3340 | ||
3341 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
54d01ffb DG |
3342 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, |
3343 | KCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3344 | } |
3345 | ||
3346 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3347 | if (ret < 0) { | |
6beb2242 DG |
3348 | if (errno != EEXIST) { |
3349 | ERR("Failed to create " KCONSUMERD_PATH); | |
3350 | goto error; | |
3351 | } | |
3352 | ret = 0; | |
d6f42150 DG |
3353 | } |
3354 | ||
3355 | /* Create the kconsumerd error unix socket */ | |
54d01ffb DG |
3356 | kconsumerd_err_sock = |
3357 | lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
d6f42150 DG |
3358 | if (kconsumerd_err_sock < 0) { |
3359 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3360 | ret = -1; | |
3361 | goto error; | |
3362 | } | |
3363 | ||
3364 | /* File permission MUST be 660 */ | |
54d01ffb DG |
3365 | ret = chmod(kconsumerd_err_unix_sock_path, |
3366 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
d6f42150 DG |
3367 | if (ret < 0) { |
3368 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3369 | perror("chmod"); | |
3370 | goto error; | |
3371 | } | |
3372 | ||
3373 | error: | |
3374 | return ret; | |
3375 | } | |
3376 | ||
fac6795d | 3377 | /* |
d063d709 | 3378 | * Signal handler for the daemon |
cf3af59e | 3379 | * |
54d01ffb DG |
3380 | * Simply stop all worker threads, leaving main() return gracefully after |
3381 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3382 | */ |
3383 | static void sighandler(int sig) | |
3384 | { | |
3385 | switch (sig) { | |
cf3af59e MD |
3386 | case SIGPIPE: |
3387 | DBG("SIGPIPE catched"); | |
3388 | return; | |
3389 | case SIGINT: | |
3390 | DBG("SIGINT catched"); | |
3391 | stop_threads(); | |
3392 | break; | |
3393 | case SIGTERM: | |
3394 | DBG("SIGTERM catched"); | |
3395 | stop_threads(); | |
3396 | break; | |
3397 | default: | |
3398 | break; | |
fac6795d | 3399 | } |
fac6795d DG |
3400 | } |
3401 | ||
3402 | /* | |
d063d709 | 3403 | * Setup signal handler for : |
1d4b027a | 3404 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3405 | */ |
1d4b027a | 3406 | static int set_signal_handler(void) |
fac6795d | 3407 | { |
1d4b027a DG |
3408 | int ret = 0; |
3409 | struct sigaction sa; | |
3410 | sigset_t sigset; | |
fac6795d | 3411 | |
1d4b027a DG |
3412 | if ((ret = sigemptyset(&sigset)) < 0) { |
3413 | perror("sigemptyset"); | |
3414 | return ret; | |
3415 | } | |
d6f42150 | 3416 | |
1d4b027a DG |
3417 | sa.sa_handler = sighandler; |
3418 | sa.sa_mask = sigset; | |
3419 | sa.sa_flags = 0; | |
3420 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3421 | perror("sigaction"); | |
3422 | return ret; | |
d6f42150 DG |
3423 | } |
3424 | ||
1d4b027a DG |
3425 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3426 | perror("sigaction"); | |
3427 | return ret; | |
d6f42150 | 3428 | } |
aaf26714 | 3429 | |
1d4b027a DG |
3430 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3431 | perror("sigaction"); | |
3432 | return ret; | |
8c0faa1d DG |
3433 | } |
3434 | ||
1d4b027a DG |
3435 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3436 | ||
3437 | return ret; | |
fac6795d DG |
3438 | } |
3439 | ||
f3ed775e | 3440 | /* |
d063d709 DG |
3441 | * Set open files limit to unlimited. This daemon can open a large number of |
3442 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3443 | */ |
3444 | static void set_ulimit(void) | |
3445 | { | |
3446 | int ret; | |
3447 | struct rlimit lim; | |
3448 | ||
a88df331 | 3449 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3450 | lim.rlim_cur = 65535; |
3451 | lim.rlim_max = 65535; | |
3452 | ||
3453 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3454 | if (ret < 0) { | |
3455 | perror("failed to set open files limit"); | |
3456 | } | |
3457 | } | |
3458 | ||
fac6795d DG |
3459 | /* |
3460 | * main | |
3461 | */ | |
3462 | int main(int argc, char **argv) | |
3463 | { | |
fac6795d DG |
3464 | int ret = 0; |
3465 | void *status; | |
b082db07 | 3466 | const char *home_path; |
fac6795d | 3467 | |
b25a8868 DG |
3468 | tracepoint(sessiond_boot_start); |
3469 | ||
273ea72c | 3470 | /* Create thread quit pipe */ |
cf3af59e MD |
3471 | if ((ret = init_thread_quit_pipe()) < 0) { |
3472 | goto error; | |
273ea72c DG |
3473 | } |
3474 | ||
fac6795d DG |
3475 | /* Parse arguments */ |
3476 | progname = argv[0]; | |
3477 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3478 | goto error; |
fac6795d DG |
3479 | } |
3480 | ||
3481 | /* Daemonize */ | |
3482 | if (opt_daemon) { | |
53094c05 DG |
3483 | ret = daemon(0, 0); |
3484 | if (ret < 0) { | |
3485 | perror("daemon"); | |
cf3af59e | 3486 | goto error; |
53094c05 | 3487 | } |
fac6795d DG |
3488 | } |
3489 | ||
3490 | /* Check if daemon is UID = 0 */ | |
3491 | is_root = !getuid(); | |
3492 | ||
fac6795d | 3493 | if (is_root) { |
d6f42150 DG |
3494 | ret = create_lttng_rundir(); |
3495 | if (ret < 0) { | |
cf3af59e | 3496 | goto error; |
d6f42150 DG |
3497 | } |
3498 | ||
fac6795d | 3499 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3500 | snprintf(apps_unix_sock_path, PATH_MAX, |
3501 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3502 | } |
3503 | ||
3504 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3505 | snprintf(client_unix_sock_path, PATH_MAX, |
3506 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3507 | } | |
0fdd1e2c DG |
3508 | |
3509 | /* Set global SHM for ust */ | |
3510 | if (strlen(wait_shm_path) == 0) { | |
3511 | snprintf(wait_shm_path, PATH_MAX, | |
3512 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3513 | } | |
fac6795d | 3514 | } else { |
b082db07 DG |
3515 | home_path = get_home_dir(); |
3516 | if (home_path == NULL) { | |
273ea72c DG |
3517 | /* TODO: Add --socket PATH option */ |
3518 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3519 | ret = -EPERM; |
3520 | goto error; | |
b082db07 DG |
3521 | } |
3522 | ||
fac6795d | 3523 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3524 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3525 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3526 | } |
3527 | ||
3528 | /* Set the cli tool unix socket path */ | |
3529 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3530 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3531 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3532 | } |
0fdd1e2c DG |
3533 | |
3534 | /* Set global SHM for ust */ | |
3535 | if (strlen(wait_shm_path) == 0) { | |
3536 | snprintf(wait_shm_path, PATH_MAX, | |
3537 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3538 | } | |
fac6795d DG |
3539 | } |
3540 | ||
847177cd DG |
3541 | DBG("Client socket path %s", client_unix_sock_path); |
3542 | DBG("Application socket path %s", apps_unix_sock_path); | |
3543 | ||
273ea72c | 3544 | /* |
7d8234d9 | 3545 | * See if daemon already exist. |
fac6795d | 3546 | */ |
7d8234d9 | 3547 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3548 | ERR("Already running daemon.\n"); |
273ea72c | 3549 | /* |
cf3af59e MD |
3550 | * We do not goto exit because we must not cleanup() |
3551 | * because a daemon is already running. | |
ab118b20 | 3552 | */ |
cf3af59e | 3553 | goto error; |
a88df331 DG |
3554 | } |
3555 | ||
54d01ffb | 3556 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3557 | |
3558 | /* | |
3559 | * These actions must be executed as root. We do that *after* setting up | |
3560 | * the sockets path because we MUST make the check for another daemon using | |
3561 | * those paths *before* trying to set the kernel consumer sockets and init | |
3562 | * kernel tracer. | |
3563 | */ | |
3564 | if (is_root) { | |
3565 | ret = set_kconsumerd_sockets(); | |
3566 | if (ret < 0) { | |
cf3af59e | 3567 | goto exit; |
a88df331 DG |
3568 | } |
3569 | ||
3570 | /* Setup kernel tracer */ | |
3571 | init_kernel_tracer(); | |
3572 | ||
3573 | /* Set ulimit for open files */ | |
3574 | set_ulimit(); | |
fac6795d DG |
3575 | } |
3576 | ||
cf3af59e MD |
3577 | if ((ret = set_signal_handler()) < 0) { |
3578 | goto exit; | |
fac6795d DG |
3579 | } |
3580 | ||
d6f42150 | 3581 | /* Setup the needed unix socket */ |
cf3af59e MD |
3582 | if ((ret = init_daemon_socket()) < 0) { |
3583 | goto exit; | |
fac6795d DG |
3584 | } |
3585 | ||
3586 | /* Set credentials to socket */ | |
cf3af59e MD |
3587 | if (is_root && ((ret = set_permissions()) < 0)) { |
3588 | goto exit; | |
fac6795d DG |
3589 | } |
3590 | ||
5b8719f5 DG |
3591 | /* Get parent pid if -S, --sig-parent is specified. */ |
3592 | if (opt_sig_parent) { | |
3593 | ppid = getppid(); | |
3594 | } | |
3595 | ||
7a485870 | 3596 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3597 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3598 | goto exit; | |
7a485870 DG |
3599 | } |
3600 | ||
099e26bd DG |
3601 | /* Setup the thread apps communication pipe. */ |
3602 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3603 | goto exit; | |
3604 | } | |
3605 | ||
3606 | /* Init UST command queue. */ | |
3607 | cds_wfq_init(&ust_cmd_queue.queue); | |
3608 | ||
273ea72c | 3609 | /* |
54d01ffb DG |
3610 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3611 | * statically declared in session.c | |
273ea72c | 3612 | */ |
54d01ffb | 3613 | session_list_ptr = session_get_list(); |
b5541356 | 3614 | |
5eb91c98 DG |
3615 | /* Set up max poll set size */ |
3616 | lttng_poll_set_max_size(); | |
3617 | ||
cf3af59e | 3618 | /* Create thread to manage the client socket */ |
099e26bd DG |
3619 | ret = pthread_create(&client_thread, NULL, |
3620 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3621 | if (ret != 0) { |
099e26bd | 3622 | perror("pthread_create clients"); |
cf3af59e MD |
3623 | goto exit_client; |
3624 | } | |
fac6795d | 3625 | |
099e26bd DG |
3626 | /* Create thread to dispatch registration */ |
3627 | ret = pthread_create(&dispatch_thread, NULL, | |
3628 | thread_dispatch_ust_registration, (void *) NULL); | |
3629 | if (ret != 0) { | |
3630 | perror("pthread_create dispatch"); | |
3631 | goto exit_dispatch; | |
3632 | } | |
3633 | ||
3634 | /* Create thread to manage application registration. */ | |
3635 | ret = pthread_create(®_apps_thread, NULL, | |
3636 | thread_registration_apps, (void *) NULL); | |
3637 | if (ret != 0) { | |
3638 | perror("pthread_create registration"); | |
3639 | goto exit_reg_apps; | |
3640 | } | |
3641 | ||
cf3af59e | 3642 | /* Create thread to manage application socket */ |
54d01ffb DG |
3643 | ret = pthread_create(&apps_thread, NULL, |
3644 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 3645 | if (ret != 0) { |
099e26bd | 3646 | perror("pthread_create apps"); |
cf3af59e MD |
3647 | goto exit_apps; |
3648 | } | |
fac6795d | 3649 | |
cf3af59e | 3650 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
3651 | ret = pthread_create(&kernel_thread, NULL, |
3652 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 3653 | if (ret != 0) { |
099e26bd | 3654 | perror("pthread_create kernel"); |
cf3af59e MD |
3655 | goto exit_kernel; |
3656 | } | |
7a485870 | 3657 | |
b25a8868 DG |
3658 | tracepoint(sessiond_boot_end); |
3659 | ||
cf3af59e MD |
3660 | ret = pthread_join(kernel_thread, &status); |
3661 | if (ret != 0) { | |
3662 | perror("pthread_join"); | |
3663 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3664 | } |
3665 | ||
cf3af59e MD |
3666 | exit_kernel: |
3667 | ret = pthread_join(apps_thread, &status); | |
3668 | if (ret != 0) { | |
3669 | perror("pthread_join"); | |
3670 | goto error; /* join error, exit without cleanup */ | |
3671 | } | |
fac6795d | 3672 | |
cf3af59e | 3673 | exit_apps: |
099e26bd DG |
3674 | ret = pthread_join(reg_apps_thread, &status); |
3675 | if (ret != 0) { | |
3676 | perror("pthread_join"); | |
3677 | goto error; /* join error, exit without cleanup */ | |
3678 | } | |
3679 | ||
3680 | exit_reg_apps: | |
3681 | ret = pthread_join(dispatch_thread, &status); | |
3682 | if (ret != 0) { | |
3683 | perror("pthread_join"); | |
3684 | goto error; /* join error, exit without cleanup */ | |
3685 | } | |
3686 | ||
3687 | exit_dispatch: | |
cf3af59e MD |
3688 | ret = pthread_join(client_thread, &status); |
3689 | if (ret != 0) { | |
3690 | perror("pthread_join"); | |
3691 | goto error; /* join error, exit without cleanup */ | |
3692 | } | |
3693 | ||
3694 | ret = join_kconsumerd_thread(); | |
3695 | if (ret != 0) { | |
3696 | perror("join_kconsumerd"); | |
3697 | goto error; /* join error, exit without cleanup */ | |
3698 | } | |
a88df331 | 3699 | |
cf3af59e | 3700 | exit_client: |
a88df331 | 3701 | exit: |
cf3af59e MD |
3702 | /* |
3703 | * cleanup() is called when no other thread is running. | |
3704 | */ | |
3705 | cleanup(); | |
3706 | if (!ret) | |
3707 | exit(EXIT_SUCCESS); | |
3708 | error: | |
5e16da05 | 3709 | exit(EXIT_FAILURE); |
fac6795d | 3710 | } |