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" |
91d76f53 | 53 | #include "traceable-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 DG |
348 | DBG("Closing all UST sockets"); |
349 | clean_traceable_apps_list(); | |
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) { | |
5eb91c98 DG |
730 | ret = update_kernel_poll(&events); |
731 | if (ret < 0) { | |
7a485870 DG |
732 | goto error; |
733 | } | |
734 | update_poll_flag = 0; | |
735 | } | |
736 | ||
5eb91c98 DG |
737 | nb_fd = LTTNG_POLL_GETNB(&events); |
738 | ||
739 | DBG("Thread kernel polling on %d fds", nb_fd); | |
740 | ||
741 | /* Zeroed the poll events */ | |
742 | lttng_poll_reset(&events); | |
7a485870 | 743 | |
b25a8868 DG |
744 | tracepoint(sessiond_th_kern_poll); |
745 | ||
7a485870 | 746 | /* Poll infinite value of time */ |
5eb91c98 | 747 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 748 | if (ret < 0) { |
7a485870 DG |
749 | goto error; |
750 | } else if (ret == 0) { | |
751 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
752 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
753 | "This should not have happened! Continuing..."); | |
7a485870 DG |
754 | continue; |
755 | } | |
756 | ||
5eb91c98 DG |
757 | for (i = 0; i < nb_fd; i++) { |
758 | /* Fetch once the poll data */ | |
759 | revents = LTTNG_POLL_GETEV(&events, i); | |
760 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 761 | |
5eb91c98 DG |
762 | /* Thread quit pipe has been closed. Killing thread. */ |
763 | ret = check_thread_quit_pipe(pollfd, revents); | |
764 | if (ret) { | |
765 | goto error; | |
766 | } | |
7a485870 | 767 | |
5eb91c98 DG |
768 | /* Check for data on kernel pipe */ |
769 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
770 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
771 | update_poll_flag = 1; | |
772 | continue; | |
773 | } else { | |
774 | /* | |
775 | * New CPU detected by the kernel. Adding kernel stream to | |
776 | * kernel session and updating the kernel consumer | |
777 | */ | |
778 | if (revents & LPOLLIN) { | |
779 | ret = update_kernel_stream(pollfd); | |
780 | if (ret < 0) { | |
781 | continue; | |
782 | } | |
783 | break; | |
784 | /* | |
785 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
786 | * and unregister kernel stream at this point. | |
787 | */ | |
7a485870 | 788 | } |
7a485870 DG |
789 | } |
790 | } | |
791 | } | |
792 | ||
793 | error: | |
794 | DBG("Kernel thread dying"); | |
273ea72c DG |
795 | close(kernel_poll_pipe[0]); |
796 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
797 | |
798 | lttng_poll_clean(&events); | |
799 | ||
7a485870 DG |
800 | return NULL; |
801 | } | |
802 | ||
1d4b027a | 803 | /* |
d063d709 | 804 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
805 | */ |
806 | static void *thread_manage_kconsumerd(void *data) | |
807 | { | |
5eb91c98 DG |
808 | int sock = 0, i, ret, pollfd; |
809 | uint32_t revents, nb_fd; | |
1d4b027a | 810 | enum lttcomm_return_code code; |
5eb91c98 | 811 | struct lttng_poll_event events; |
1d4b027a | 812 | |
b25a8868 DG |
813 | tracepoint(sessiond_th_kcon_start); |
814 | ||
1d4b027a DG |
815 | DBG("[thread] Manage kconsumerd started"); |
816 | ||
817 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
818 | if (ret < 0) { | |
819 | goto error; | |
820 | } | |
821 | ||
5eb91c98 DG |
822 | /* |
823 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
824 | * Nothing more will be added to this poll set. | |
825 | */ | |
826 | ret = create_thread_poll_set(&events, 2); | |
827 | if (ret < 0) { | |
828 | goto error; | |
829 | } | |
273ea72c | 830 | |
5eb91c98 DG |
831 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
832 | if (ret < 0) { | |
833 | goto error; | |
834 | } | |
273ea72c | 835 | |
5eb91c98 | 836 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 837 | |
b25a8868 DG |
838 | tracepoint(sessiond_th_kcon_poll); |
839 | ||
273ea72c | 840 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 841 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 842 | if (ret < 0) { |
273ea72c DG |
843 | goto error; |
844 | } | |
845 | ||
5eb91c98 DG |
846 | for (i = 0; i < nb_fd; i++) { |
847 | /* Fetch once the poll data */ | |
848 | revents = LTTNG_POLL_GETEV(&events, i); | |
849 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
850 | ||
851 | /* Thread quit pipe has been closed. Killing thread. */ | |
852 | ret = check_thread_quit_pipe(pollfd, revents); | |
853 | if (ret) { | |
854 | goto error; | |
855 | } | |
856 | ||
857 | /* Event on the registration socket */ | |
858 | if (pollfd == kconsumerd_err_sock) { | |
859 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
860 | ERR("Kconsumerd err socket poll error"); | |
861 | goto error; | |
862 | } | |
863 | } | |
273ea72c DG |
864 | } |
865 | ||
1d4b027a DG |
866 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
867 | if (sock < 0) { | |
868 | goto error; | |
869 | } | |
870 | ||
712ea556 | 871 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
872 | ret = lttcomm_recv_unix_sock(sock, &code, |
873 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
874 | if (ret <= 0) { |
875 | goto error; | |
876 | } | |
877 | ||
878 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
54d01ffb DG |
879 | kconsumerd_cmd_sock = |
880 | lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
1d4b027a | 881 | if (kconsumerd_cmd_sock < 0) { |
712ea556 | 882 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
883 | perror("kconsumerd connect"); |
884 | goto error; | |
885 | } | |
886 | /* Signal condition to tell that the kconsumerd is ready */ | |
887 | sem_post(&kconsumerd_sem); | |
888 | DBG("Kconsumerd command socket ready"); | |
889 | } else { | |
6f61d021 | 890 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
891 | lttcomm_get_readable_code(-code)); |
892 | goto error; | |
893 | } | |
894 | ||
54d01ffb | 895 | /* Remove the kconsumerd error sock since we've established a connexion */ |
5eb91c98 | 896 | ret = lttng_poll_del(&events, kconsumerd_err_sock); |
72079cae | 897 | if (ret < 0) { |
72079cae DG |
898 | goto error; |
899 | } | |
900 | ||
5eb91c98 DG |
901 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
902 | if (ret < 0) { | |
72079cae | 903 | goto error; |
5eb91c98 DG |
904 | } |
905 | ||
906 | /* Update number of fd */ | |
907 | nb_fd = LTTNG_POLL_GETNB(&events); | |
908 | ||
909 | /* Inifinite blocking call, waiting for transmission */ | |
910 | ret = lttng_poll_wait(&events, -1); | |
911 | if (ret < 0) { | |
72079cae DG |
912 | goto error; |
913 | } | |
914 | ||
5eb91c98 DG |
915 | for (i = 0; i < nb_fd; i++) { |
916 | /* Fetch once the poll data */ | |
917 | revents = LTTNG_POLL_GETEV(&events, i); | |
918 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
919 | ||
920 | /* Thread quit pipe has been closed. Killing thread. */ | |
921 | ret = check_thread_quit_pipe(pollfd, revents); | |
922 | if (ret) { | |
923 | goto error; | |
924 | } | |
925 | ||
926 | /* Event on the kconsumerd socket */ | |
927 | if (pollfd == sock) { | |
928 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
929 | ERR("Kconsumerd err socket second poll error"); | |
930 | goto error; | |
931 | } | |
932 | } | |
933 | } | |
934 | ||
712ea556 | 935 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
936 | ret = lttcomm_recv_unix_sock(sock, &code, |
937 | sizeof(enum lttcomm_return_code)); | |
712ea556 DG |
938 | if (ret <= 0) { |
939 | ERR("Kconsumerd closed the command socket"); | |
940 | goto error; | |
6f61d021 | 941 | } |
1d4b027a | 942 | |
712ea556 DG |
943 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
944 | ||
1d4b027a | 945 | error: |
6f61d021 | 946 | DBG("Kconsumerd thread dying"); |
5eb91c98 DG |
947 | close(kconsumerd_err_sock); |
948 | close(kconsumerd_cmd_sock); | |
949 | close(sock); | |
273ea72c DG |
950 | |
951 | unlink(kconsumerd_err_unix_sock_path); | |
952 | unlink(kconsumerd_cmd_unix_sock_path); | |
273ea72c | 953 | kconsumerd_pid = 0; |
0177d773 | 954 | |
5eb91c98 | 955 | lttng_poll_clean(&events); |
0177d773 | 956 | |
5eb91c98 | 957 | return NULL; |
099e26bd DG |
958 | } |
959 | ||
099e26bd DG |
960 | /* |
961 | * This thread manage application communication. | |
1d4b027a DG |
962 | */ |
963 | static void *thread_manage_apps(void *data) | |
099e26bd | 964 | { |
5eb91c98 DG |
965 | int i, ret, pollfd; |
966 | uint32_t revents, nb_fd; | |
099e26bd | 967 | struct ust_command ust_cmd; |
5eb91c98 | 968 | struct lttng_poll_event events; |
099e26bd | 969 | |
85c434ee DG |
970 | tracepoint(sessiond_th_apps_start); |
971 | ||
099e26bd DG |
972 | DBG("[thread] Manage application started"); |
973 | ||
5eb91c98 DG |
974 | ret = create_thread_poll_set(&events, 2); |
975 | if (ret < 0) { | |
976 | goto error; | |
977 | } | |
099e26bd | 978 | |
5eb91c98 DG |
979 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
980 | if (ret < 0) { | |
981 | goto error; | |
982 | } | |
099e26bd | 983 | |
5eb91c98 DG |
984 | while (1) { |
985 | /* Zeroed the events structure */ | |
986 | lttng_poll_reset(&events); | |
0177d773 | 987 | |
5eb91c98 | 988 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
989 | |
990 | DBG("Apps thread polling on %d fds", nb_fd); | |
991 | ||
85c434ee DG |
992 | tracepoint(sessiond_th_apps_poll); |
993 | ||
099e26bd | 994 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 995 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 996 | if (ret < 0) { |
099e26bd DG |
997 | goto error; |
998 | } | |
999 | ||
5eb91c98 DG |
1000 | for (i = 0; i < nb_fd; i++) { |
1001 | /* Fetch once the poll data */ | |
1002 | revents = LTTNG_POLL_GETEV(&events, i); | |
1003 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1004 | ||
1005 | /* Thread quit pipe has been closed. Killing thread. */ | |
1006 | ret = check_thread_quit_pipe(pollfd, revents); | |
1007 | if (ret) { | |
099e26bd | 1008 | goto error; |
5eb91c98 | 1009 | } |
62d53818 | 1010 | |
5eb91c98 DG |
1011 | /* Inspect the apps cmd pipe */ |
1012 | if (pollfd == apps_cmd_pipe[0]) { | |
1013 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1014 | ERR("Apps command pipe error"); | |
0177d773 | 1015 | goto error; |
5eb91c98 | 1016 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1017 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1018 | /* Empty pipe */ |
1019 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1020 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1021 | perror("read apps cmd pipe"); | |
1022 | goto error; | |
1023 | } | |
a89c7d1b | 1024 | tracepoint(ust_register_read_stop); |
099e26bd | 1025 | |
a89c7d1b | 1026 | tracepoint(ust_register_add_start); |
5eb91c98 | 1027 | /* Register applicaton to the session daemon */ |
54d01ffb DG |
1028 | ret = register_traceable_app(&ust_cmd.reg_msg, |
1029 | ust_cmd.sock); | |
5eb91c98 DG |
1030 | if (ret < 0) { |
1031 | /* Only critical ENOMEM error can be returned here */ | |
1032 | goto error; | |
1033 | } | |
a89c7d1b | 1034 | tracepoint(ust_register_add_stop); |
85c434ee | 1035 | |
a89c7d1b | 1036 | tracepoint(ust_register_done_start); |
5eb91c98 DG |
1037 | ret = ustctl_register_done(ust_cmd.sock); |
1038 | if (ret < 0) { | |
1039 | /* | |
1040 | * If the registration is not possible, we simply | |
1041 | * unregister the apps and continue | |
1042 | */ | |
1043 | unregister_traceable_app(ust_cmd.sock); | |
1044 | } else { | |
1045 | /* | |
1046 | * We just need here to monitor the close of the UST | |
1047 | * socket and poll set monitor those by default. | |
1048 | */ | |
1049 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1050 | if (ret < 0) { | |
1051 | goto error; | |
1052 | } | |
1053 | ||
54d01ffb DG |
1054 | DBG("Apps with sock %d added to poll set", |
1055 | ust_cmd.sock); | |
5eb91c98 | 1056 | } |
a89c7d1b | 1057 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1058 | break; |
0177d773 | 1059 | } |
5eb91c98 DG |
1060 | } else { |
1061 | /* | |
54d01ffb DG |
1062 | * At this point, we know that a registered application made |
1063 | * the event at poll_wait. | |
5eb91c98 DG |
1064 | */ |
1065 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1066 | /* Removing from the poll set */ | |
1067 | ret = lttng_poll_del(&events, pollfd); | |
1068 | if (ret < 0) { | |
1069 | goto error; | |
1070 | } | |
099e26bd | 1071 | |
5eb91c98 DG |
1072 | /* Socket closed */ |
1073 | unregister_traceable_app(pollfd); | |
1074 | break; | |
0177d773 | 1075 | } |
099e26bd DG |
1076 | } |
1077 | } | |
099e26bd DG |
1078 | } |
1079 | ||
1080 | error: | |
1081 | DBG("Application communication apps dying"); | |
1082 | close(apps_cmd_pipe[0]); | |
1083 | close(apps_cmd_pipe[1]); | |
1084 | ||
5eb91c98 | 1085 | lttng_poll_clean(&events); |
099e26bd DG |
1086 | |
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Dispatch request from the registration threads to the application | |
1092 | * communication thread. | |
1093 | */ | |
1094 | static void *thread_dispatch_ust_registration(void *data) | |
1095 | { | |
1096 | int ret; | |
1097 | struct cds_wfq_node *node; | |
1098 | struct ust_command *ust_cmd = NULL; | |
1099 | ||
85c434ee DG |
1100 | tracepoint(sessiond_th_dispatch_start); |
1101 | ||
099e26bd DG |
1102 | DBG("[thread] Dispatch UST command started"); |
1103 | ||
1104 | while (!dispatch_thread_exit) { | |
1105 | /* Atomically prepare the queue futex */ | |
1106 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1107 | ||
1108 | do { | |
85c434ee DG |
1109 | tracepoint(sessiond_th_dispatch_block); |
1110 | ||
099e26bd DG |
1111 | /* Dequeue command for registration */ |
1112 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1113 | if (node == NULL) { | |
1114 | DBG("Waked up but nothing in the UST command queue"); | |
1115 | /* Continue thread execution */ | |
1116 | break; | |
1117 | } | |
1118 | ||
62d53818 DG |
1119 | tracepoint(ust_dispatch_register_start); |
1120 | ||
099e26bd DG |
1121 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1122 | ||
2f50c8a3 DG |
1123 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1124 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1125 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1126 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1127 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1128 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1129 | /* |
1130 | * Inform apps thread of the new application registration. This | |
1131 | * call is blocking so we can be assured that the data will be read | |
1132 | * at some point in time or wait to the end of the world :) | |
1133 | */ | |
1134 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1135 | sizeof(struct ust_command)); | |
1136 | if (ret < 0) { | |
1137 | perror("write apps cmd pipe"); | |
1138 | if (errno == EBADF) { | |
1139 | /* | |
1140 | * We can't inform the application thread to process | |
1141 | * registration. We will exit or else application | |
1142 | * registration will not occur and tracing will never | |
1143 | * start. | |
1144 | */ | |
1145 | goto error; | |
1146 | } | |
1147 | } | |
1148 | free(ust_cmd); | |
1149 | } while (node != NULL); | |
1150 | ||
62d53818 DG |
1151 | tracepoint(ust_dispatch_register_stop); |
1152 | ||
099e26bd DG |
1153 | /* Futex wait on queue. Blocking call on futex() */ |
1154 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1155 | } | |
1156 | ||
1157 | error: | |
1158 | DBG("Dispatch thread dying"); | |
1159 | return NULL; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * This thread manage application registration. | |
1164 | */ | |
1165 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1166 | { |
5eb91c98 DG |
1167 | int sock = 0, i, ret, pollfd; |
1168 | uint32_t revents, nb_fd; | |
1169 | struct lttng_poll_event events; | |
099e26bd DG |
1170 | /* |
1171 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1172 | * freed in the manage apps thread. | |
1173 | */ | |
1174 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1175 | |
62d53818 | 1176 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1177 | |
099e26bd | 1178 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1179 | |
1180 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1181 | if (ret < 0) { | |
1182 | goto error; | |
1183 | } | |
1184 | ||
5eb91c98 DG |
1185 | /* |
1186 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1187 | * more will be added to this poll set. | |
1188 | */ | |
1189 | ret = create_thread_poll_set(&events, 2); | |
1190 | if (ret < 0) { | |
1191 | goto error; | |
1192 | } | |
273ea72c | 1193 | |
5eb91c98 DG |
1194 | /* Add the application registration socket */ |
1195 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1196 | if (ret < 0) { | |
1197 | goto error; | |
1198 | } | |
273ea72c | 1199 | |
1d4b027a | 1200 | /* Notify all applications to register */ |
0fdd1e2c DG |
1201 | ret = notify_ust_apps(1); |
1202 | if (ret < 0) { | |
1203 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1204 | "Execution continues but there might be problem for already\n" |
1205 | "running applications that wishes to register."); | |
0fdd1e2c | 1206 | } |
1d4b027a DG |
1207 | |
1208 | while (1) { | |
1209 | DBG("Accepting application registration"); | |
273ea72c | 1210 | |
62d53818 | 1211 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1212 | |
5eb91c98 DG |
1213 | nb_fd = LTTNG_POLL_GETNB(&events); |
1214 | ||
273ea72c | 1215 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1216 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1217 | if (ret < 0) { |
273ea72c DG |
1218 | goto error; |
1219 | } | |
1220 | ||
5eb91c98 DG |
1221 | for (i = 0; i < nb_fd; i++) { |
1222 | /* Fetch once the poll data */ | |
1223 | revents = LTTNG_POLL_GETEV(&events, i); | |
1224 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1225 | |
5eb91c98 DG |
1226 | /* Thread quit pipe has been closed. Killing thread. */ |
1227 | ret = check_thread_quit_pipe(pollfd, revents); | |
1228 | if (ret) { | |
90014c57 DG |
1229 | goto error; |
1230 | } | |
62d53818 | 1231 | |
5eb91c98 DG |
1232 | /* Event on the registration socket */ |
1233 | if (pollfd == apps_sock) { | |
1234 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1235 | ERR("Register apps socket poll error"); | |
1236 | goto error; | |
1237 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1238 | /* Registration starts here. Recording cycles */ |
1239 | tracepoint(ust_register_start); | |
1d4b027a | 1240 | |
5eb91c98 DG |
1241 | sock = lttcomm_accept_unix_sock(apps_sock); |
1242 | if (sock < 0) { | |
1243 | goto error; | |
1244 | } | |
099e26bd | 1245 | |
5eb91c98 DG |
1246 | /* Create UST registration command for enqueuing */ |
1247 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1248 | if (ust_cmd == NULL) { | |
1249 | perror("ust command malloc"); | |
1250 | goto error; | |
1251 | } | |
1d4b027a | 1252 | |
5eb91c98 DG |
1253 | /* |
1254 | * Using message-based transmissions to ensure we don't | |
1255 | * have to deal with partially received messages. | |
1256 | */ | |
1257 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1258 | sizeof(struct ust_register_msg)); | |
1259 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1260 | if (ret < 0) { | |
1261 | perror("lttcomm_recv_unix_sock register apps"); | |
1262 | } else { | |
1263 | ERR("Wrong size received on apps register"); | |
1264 | } | |
1265 | free(ust_cmd); | |
1266 | close(sock); | |
1267 | continue; | |
1268 | } | |
099e26bd | 1269 | |
5eb91c98 | 1270 | ust_cmd->sock = sock; |
099e26bd | 1271 | |
5eb91c98 DG |
1272 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1273 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1274 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1275 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1276 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1277 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1278 | |
5eb91c98 DG |
1279 | /* |
1280 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1281 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1282 | */ |
1283 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1284 | |
5eb91c98 DG |
1285 | /* |
1286 | * Wake the registration queue futex. Implicit memory | |
1287 | * barrier with the exchange in cds_wfq_enqueue. | |
1288 | */ | |
1289 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1290 | |
1291 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1292 | } |
1293 | } | |
90014c57 | 1294 | } |
1d4b027a DG |
1295 | } |
1296 | ||
1297 | error: | |
0fdd1e2c DG |
1298 | DBG("UST Registration thread dying"); |
1299 | ||
1300 | /* Notify that the registration thread is gone */ | |
1301 | notify_ust_apps(0); | |
1302 | ||
1303 | close(apps_sock); | |
1304 | close(sock); | |
273ea72c | 1305 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1306 | |
5eb91c98 DG |
1307 | lttng_poll_clean(&events); |
1308 | ||
1d4b027a DG |
1309 | return NULL; |
1310 | } | |
1311 | ||
8c0faa1d | 1312 | /* |
d063d709 DG |
1313 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1314 | * exec or it will fails. | |
8c0faa1d | 1315 | */ |
693bd40b | 1316 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1317 | { |
1318 | int ret; | |
1319 | ||
1320 | /* Setup semaphore */ | |
1321 | sem_init(&kconsumerd_sem, 0, 0); | |
1322 | ||
54d01ffb DG |
1323 | ret = pthread_create(&kconsumerd_thread, NULL, |
1324 | thread_manage_kconsumerd, (void *) NULL); | |
8c0faa1d DG |
1325 | if (ret != 0) { |
1326 | perror("pthread_create kconsumerd"); | |
1327 | goto error; | |
1328 | } | |
1329 | ||
693bd40b | 1330 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1331 | sem_wait(&kconsumerd_sem); |
1332 | ||
712ea556 DG |
1333 | if (kconsumerd_pid == 0) { |
1334 | ERR("Kconsumerd did not start"); | |
1335 | goto error; | |
1336 | } | |
1337 | ||
8c0faa1d DG |
1338 | return 0; |
1339 | ||
1340 | error: | |
712ea556 | 1341 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1342 | return ret; |
1343 | } | |
1344 | ||
d9800920 DG |
1345 | /* |
1346 | * Join kernel consumer thread | |
1347 | */ | |
cf3af59e MD |
1348 | static int join_kconsumerd_thread(void) |
1349 | { | |
1350 | void *status; | |
1351 | int ret; | |
1352 | ||
1353 | if (kconsumerd_pid != 0) { | |
1354 | ret = kill(kconsumerd_pid, SIGTERM); | |
1355 | if (ret) { | |
1356 | ERR("Error killing kconsumerd"); | |
1357 | return ret; | |
1358 | } | |
1359 | return pthread_join(kconsumerd_thread, &status); | |
1360 | } else { | |
1361 | return 0; | |
1362 | } | |
1363 | } | |
1364 | ||
8c0faa1d | 1365 | /* |
d063d709 | 1366 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1367 | * |
d063d709 | 1368 | * Return pid if successful else -1. |
8c0faa1d | 1369 | */ |
693bd40b | 1370 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1371 | { |
1372 | int ret; | |
1373 | pid_t pid; | |
53086306 | 1374 | const char *verbosity; |
8c0faa1d | 1375 | |
c49dc785 DG |
1376 | DBG("Spawning kconsumerd"); |
1377 | ||
8c0faa1d DG |
1378 | pid = fork(); |
1379 | if (pid == 0) { | |
1380 | /* | |
1381 | * Exec kconsumerd. | |
1382 | */ | |
31f73cc9 | 1383 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1384 | verbosity = "--verbose"; |
1385 | } else { | |
1386 | verbosity = "--quiet"; | |
1387 | } | |
54d01ffb DG |
1388 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", |
1389 | "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1390 | if (errno != 0) { |
1391 | perror("kernel start consumer exec"); | |
1392 | } | |
1393 | exit(EXIT_FAILURE); | |
1394 | } else if (pid > 0) { | |
1395 | ret = pid; | |
1396 | goto error; | |
1397 | } else { | |
1398 | perror("kernel start consumer fork"); | |
1399 | ret = -errno; | |
1400 | goto error; | |
1401 | } | |
1402 | ||
1403 | error: | |
1404 | return ret; | |
1405 | } | |
1406 | ||
693bd40b | 1407 | /* |
d063d709 | 1408 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1409 | */ |
1410 | static int start_kconsumerd(void) | |
1411 | { | |
1412 | int ret; | |
1413 | ||
693bd40b | 1414 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1415 | if (kconsumerd_pid != 0) { |
817153bb | 1416 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1417 | goto end; |
1418 | } | |
693bd40b | 1419 | |
c49dc785 DG |
1420 | ret = spawn_kconsumerd(); |
1421 | if (ret < 0) { | |
1422 | ERR("Spawning kconsumerd failed"); | |
1423 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1424 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1425 | goto error; | |
693bd40b | 1426 | } |
c49dc785 DG |
1427 | |
1428 | /* Setting up the global kconsumerd_pid */ | |
1429 | kconsumerd_pid = ret; | |
693bd40b DG |
1430 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1431 | ||
6f61d021 DG |
1432 | DBG("Kconsumerd pid %d", ret); |
1433 | ||
693bd40b | 1434 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1435 | ret = spawn_kconsumerd_thread(); |
1436 | if (ret < 0) { | |
1437 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1438 | goto error; |
1439 | } | |
1440 | ||
c49dc785 | 1441 | end: |
693bd40b DG |
1442 | return 0; |
1443 | ||
1444 | error: | |
1445 | return ret; | |
1446 | } | |
1447 | ||
b73401da | 1448 | /* |
d063d709 | 1449 | * modprobe_kernel_modules |
b73401da DG |
1450 | */ |
1451 | static int modprobe_kernel_modules(void) | |
1452 | { | |
ab147185 | 1453 | int ret = 0, i; |
b73401da DG |
1454 | char modprobe[256]; |
1455 | ||
ab147185 MD |
1456 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1457 | ret = snprintf(modprobe, sizeof(modprobe), | |
1458 | "/sbin/modprobe %s%s", | |
1459 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1460 | kernel_modules_list[i].name); | |
b73401da DG |
1461 | if (ret < 0) { |
1462 | perror("snprintf modprobe"); | |
1463 | goto error; | |
1464 | } | |
ab147185 | 1465 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1466 | ret = system(modprobe); |
ab147185 MD |
1467 | if (ret == -1) { |
1468 | ERR("Unable to launch modprobe for module %s", | |
1469 | kernel_modules_list[i].name); | |
1470 | } else if (kernel_modules_list[i].required | |
d9800920 | 1471 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1472 | ERR("Unable to load module %s", |
1473 | kernel_modules_list[i].name); | |
1474 | } else { | |
1475 | DBG("Modprobe successfully %s", | |
1476 | kernel_modules_list[i].name); | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | error: | |
1481 | return ret; | |
1482 | } | |
1483 | ||
b73401da | 1484 | /* |
d063d709 | 1485 | * mount_debugfs |
b73401da DG |
1486 | */ |
1487 | static int mount_debugfs(char *path) | |
1488 | { | |
1489 | int ret; | |
1490 | char *type = "debugfs"; | |
1491 | ||
996b65c8 | 1492 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1493 | if (ret < 0) { |
1494 | goto error; | |
1495 | } | |
1496 | ||
1497 | ret = mount(type, path, type, 0, NULL); | |
1498 | if (ret < 0) { | |
1499 | perror("mount debugfs"); | |
1500 | goto error; | |
1501 | } | |
1502 | ||
1503 | DBG("Mounted debugfs successfully at %s", path); | |
1504 | ||
1505 | error: | |
1506 | return ret; | |
1507 | } | |
1508 | ||
8c0faa1d | 1509 | /* |
d063d709 | 1510 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1511 | */ |
f3ed775e | 1512 | static void init_kernel_tracer(void) |
8c0faa1d | 1513 | { |
b73401da DG |
1514 | int ret; |
1515 | char *proc_mounts = "/proc/mounts"; | |
1516 | char line[256]; | |
684d34d2 | 1517 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1518 | FILE *fp; |
1519 | ||
1520 | /* Detect debugfs */ | |
1521 | fp = fopen(proc_mounts, "r"); | |
1522 | if (fp == NULL) { | |
1523 | ERR("Unable to probe %s", proc_mounts); | |
1524 | goto error; | |
1525 | } | |
1526 | ||
1527 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1528 | if (strstr(line, "debugfs") != NULL) { | |
1529 | /* Remove first string */ | |
1530 | strtok(line, " "); | |
1531 | /* Dup string here so we can reuse line later on */ | |
1532 | debugfs_path = strdup(strtok(NULL, " ")); | |
1533 | DBG("Got debugfs path : %s", debugfs_path); | |
1534 | break; | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | fclose(fp); | |
1539 | ||
1540 | /* Mount debugfs if needded */ | |
1541 | if (debugfs_path == NULL) { | |
1542 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1543 | if (ret < 0) { | |
1544 | perror("asprintf debugfs path"); | |
1545 | goto error; | |
1546 | } | |
1547 | ret = mount_debugfs(debugfs_path); | |
1548 | if (ret < 0) { | |
1549 | goto error; | |
1550 | } | |
1551 | } | |
1552 | ||
1553 | /* Modprobe lttng kernel modules */ | |
1554 | ret = modprobe_kernel_modules(); | |
1555 | if (ret < 0) { | |
1556 | goto error; | |
1557 | } | |
1558 | ||
1559 | /* Setup lttng kernel path */ | |
1560 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1561 | if (ret < 0) { | |
1562 | perror("asprintf lttng path"); | |
1563 | goto error; | |
1564 | } | |
1565 | ||
1566 | /* Open debugfs lttng */ | |
1567 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1568 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1569 | DBG("Failed to open %s", lttng_path); |
1570 | goto error; | |
8c0faa1d DG |
1571 | } |
1572 | ||
b73401da DG |
1573 | free(lttng_path); |
1574 | free(debugfs_path); | |
f3ed775e | 1575 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1576 | return; |
1577 | ||
1578 | error: | |
1579 | if (lttng_path) { | |
1580 | free(lttng_path); | |
1581 | } | |
1582 | if (debugfs_path) { | |
1583 | free(debugfs_path); | |
1584 | } | |
1585 | WARN("No kernel tracer available"); | |
1586 | kernel_tracer_fd = 0; | |
1587 | return; | |
f3ed775e | 1588 | } |
33a2b854 | 1589 | |
f3ed775e | 1590 | /* |
54d01ffb | 1591 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1592 | */ |
54d01ffb | 1593 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1594 | { |
f40799e8 | 1595 | int ret = 0; |
8c0faa1d | 1596 | |
f3ed775e | 1597 | if (session->kconsumer_fds_sent == 0) { |
d9800920 | 1598 | /* |
54d01ffb DG |
1599 | * Assign default kernel consumer socket if no consumer assigned to the |
1600 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1601 | * an extra security check. | |
d9800920 DG |
1602 | */ |
1603 | if (session->consumer_fd == 0) { | |
1604 | session->consumer_fd = kconsumerd_cmd_sock; | |
1605 | } | |
1606 | ||
1607 | ret = send_kconsumerd_fds(session); | |
f3ed775e | 1608 | if (ret < 0) { |
f3ed775e DG |
1609 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1610 | goto error; | |
1611 | } | |
1d4b027a | 1612 | |
f3ed775e DG |
1613 | session->kconsumer_fds_sent = 1; |
1614 | } | |
1d4b027a DG |
1615 | |
1616 | error: | |
1617 | return ret; | |
8c0faa1d DG |
1618 | } |
1619 | ||
0177d773 DG |
1620 | /* |
1621 | * Create an UST session and add it to the session ust list. | |
1622 | */ | |
1623 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1624 | { | |
1625 | int ret = -1; | |
1626 | struct ltt_ust_session *lus; | |
1627 | ||
1628 | DBG("Creating UST session"); | |
1629 | ||
1630 | lus = trace_ust_create_session(session->path, pid); | |
1631 | if (lus == NULL) { | |
1632 | goto error; | |
1633 | } | |
1634 | ||
1635 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1636 | geteuid(), allowed_group()); | |
1637 | if (ret < 0) { | |
1638 | if (ret != -EEXIST) { | |
1639 | ERR("Trace directory creation error"); | |
1640 | goto error; | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | /* Create session on the UST tracer */ | |
1645 | ret = ustctl_create_session(lus); | |
1646 | if (ret < 0) { | |
1647 | goto error; | |
1648 | } | |
1649 | ||
1650 | return 0; | |
1651 | ||
1652 | error: | |
1653 | free(lus); | |
1654 | return ret; | |
1655 | } | |
1656 | ||
333f285e | 1657 | /* |
d063d709 | 1658 | * Create a kernel tracer session then create the default channel. |
333f285e | 1659 | */ |
f3ed775e | 1660 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1661 | { |
f3ed775e | 1662 | int ret; |
f3ed775e DG |
1663 | |
1664 | DBG("Creating kernel session"); | |
1665 | ||
1666 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1667 | if (ret < 0) { | |
1668 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1669 | goto error; | |
333f285e DG |
1670 | } |
1671 | ||
d9800920 DG |
1672 | /* Set kernel consumer socket fd */ |
1673 | if (kconsumerd_cmd_sock) { | |
1674 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1675 | } | |
1676 | ||
63053e7c DG |
1677 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1678 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1679 | if (ret < 0) { |
996b65c8 | 1680 | if (ret != -EEXIST) { |
7a485870 DG |
1681 | ERR("Trace directory creation error"); |
1682 | goto error; | |
1683 | } | |
1684 | } | |
1685 | ||
f3ed775e DG |
1686 | error: |
1687 | return ret; | |
333f285e DG |
1688 | } |
1689 | ||
6c9cc2ab DG |
1690 | /* |
1691 | * Using the session list, filled a lttng_session array to send back to the | |
1692 | * client for session listing. | |
1693 | * | |
1694 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1695 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1696 | */ |
1697 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1698 | { | |
1699 | int i = 0; | |
1700 | struct ltt_session *session; | |
1701 | ||
1702 | DBG("Getting all available session"); | |
1703 | /* | |
1704 | * Iterate over session list and append data after the control struct in | |
1705 | * the buffer. | |
1706 | */ | |
1707 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1708 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1709 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1710 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1711 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1712 | i++; |
1713 | } | |
1714 | } | |
1715 | ||
9f19cc17 DG |
1716 | /* |
1717 | * Fill lttng_channel array of all channels. | |
1718 | */ | |
1719 | static void list_lttng_channels(struct ltt_session *session, | |
1720 | struct lttng_channel *channels) | |
1721 | { | |
1722 | int i = 0; | |
1723 | struct ltt_kernel_channel *kchan; | |
1724 | ||
1725 | DBG("Listing channels for session %s", session->name); | |
1726 | ||
1727 | /* Kernel channels */ | |
1728 | if (session->kernel_session != NULL) { | |
54d01ffb DG |
1729 | cds_list_for_each_entry(kchan, |
1730 | &session->kernel_session->channel_list.head, list) { | |
9f19cc17 DG |
1731 | /* Copy lttng_channel struct to array */ |
1732 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1733 | channels[i].enabled = kchan->enabled; | |
1734 | i++; | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | /* TODO: Missing UST listing */ | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * Fill lttng_event array of all events in the channel. | |
1743 | */ | |
1744 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1745 | struct lttng_event *events) | |
1746 | { | |
1747 | /* | |
1748 | * TODO: This is ONLY kernel. Need UST support. | |
1749 | */ | |
1750 | int i = 0; | |
1751 | struct ltt_kernel_event *event; | |
1752 | ||
1753 | DBG("Listing events for channel %s", kchan->channel->name); | |
1754 | ||
1755 | /* Kernel channels */ | |
1756 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1757 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1758 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1759 | events[i].enabled = event->enabled; |
1760 | switch (event->event->instrumentation) { | |
1761 | case LTTNG_KERNEL_TRACEPOINT: | |
1762 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1763 | break; | |
1764 | case LTTNG_KERNEL_KPROBE: | |
1765 | case LTTNG_KERNEL_KRETPROBE: | |
1766 | events[i].type = LTTNG_EVENT_PROBE; | |
1767 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1768 | sizeof(struct lttng_kernel_kprobe)); | |
1769 | break; | |
1770 | case LTTNG_KERNEL_FUNCTION: | |
1771 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1772 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1773 | sizeof(struct lttng_kernel_function)); | |
1774 | break; | |
0133c199 MD |
1775 | case LTTNG_KERNEL_NOOP: |
1776 | events[i].type = LTTNG_EVENT_NOOP; | |
1777 | break; | |
a54bd42d MD |
1778 | case LTTNG_KERNEL_SYSCALL: |
1779 | events[i].type = LTTNG_EVENT_SYSCALL; | |
0133c199 | 1780 | break; |
9f19cc17 DG |
1781 | } |
1782 | i++; | |
1783 | } | |
1784 | } | |
1785 | ||
fac6795d | 1786 | /* |
54d01ffb | 1787 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1788 | */ |
54d01ffb DG |
1789 | static int cmd_disable_channel(struct ltt_session *session, |
1790 | int domain, char *channel_name) | |
fac6795d | 1791 | { |
54d01ffb | 1792 | int ret; |
379473d2 | 1793 | |
54d01ffb DG |
1794 | switch (domain) { |
1795 | case LTTNG_DOMAIN_KERNEL: | |
1796 | ret = channel_kernel_disable(session->kernel_session, | |
1797 | channel_name); | |
1798 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1799 | goto error; |
1800 | } | |
54d01ffb DG |
1801 | |
1802 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c MD |
1803 | break; |
1804 | default: | |
54d01ffb DG |
1805 | /* TODO: Userspace tracing */ |
1806 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1807 | goto error; | |
20fe2104 DG |
1808 | } |
1809 | ||
54d01ffb | 1810 | ret = LTTCOMM_OK; |
d65106b1 | 1811 | |
54d01ffb DG |
1812 | error: |
1813 | return ret; | |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1818 | */ | |
1819 | static int cmd_enable_channel(struct ltt_session *session, int domain, | |
1820 | char *channel_name, struct lttng_channel *attr) | |
1821 | { | |
1822 | int ret; | |
1823 | struct ltt_kernel_channel *kchan; | |
d65106b1 | 1824 | |
54d01ffb | 1825 | switch (domain) { |
b579acd9 | 1826 | case LTTNG_DOMAIN_KERNEL: |
54d01ffb DG |
1827 | kchan = trace_kernel_get_channel_by_name(channel_name, |
1828 | session->kernel_session); | |
1829 | if (kchan == NULL) { | |
1830 | ret = channel_kernel_create(session->kernel_session, | |
1831 | channel_name, attr, kernel_poll_pipe[1]); | |
1832 | } else { | |
1833 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1834 | } | |
1835 | ||
b579acd9 | 1836 | if (ret != LTTCOMM_OK) { |
d65106b1 DG |
1837 | goto error; |
1838 | } | |
54d01ffb DG |
1839 | |
1840 | kernel_wait_quiescent(kernel_tracer_fd); | |
b579acd9 DG |
1841 | break; |
1842 | default: | |
1843 | /* TODO: Userspace tracing */ | |
1844 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1845 | goto error; |
54d01ffb DG |
1846 | } |
1847 | ||
1848 | ret = LTTCOMM_OK; | |
1849 | ||
1850 | error: | |
1851 | return ret; | |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1856 | */ | |
1857 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
1858 | char *channel_name, char *event_name) | |
1859 | { | |
1860 | int ret; | |
1861 | struct ltt_kernel_channel *kchan; | |
1862 | ||
1863 | switch (domain) { | |
1864 | case LTTNG_DOMAIN_KERNEL: | |
1865 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1866 | session->kernel_session); | |
1867 | if (kchan == NULL) { | |
1868 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1869 | goto error; | |
d65106b1 DG |
1870 | } |
1871 | ||
54d01ffb DG |
1872 | ret = event_kernel_disable(session->kernel_session, kchan, event_name); |
1873 | if (ret != LTTCOMM_OK) { | |
1874 | goto error; | |
1875 | } | |
1876 | ||
1877 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 1878 | break; |
54d01ffb DG |
1879 | default: |
1880 | /* TODO: Userspace tracing */ | |
1881 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1882 | goto error; | |
d65106b1 | 1883 | } |
26cc6b4e | 1884 | |
54d01ffb DG |
1885 | ret = LTTCOMM_OK; |
1886 | ||
1887 | error: | |
1888 | return ret; | |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
1893 | */ | |
1894 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
1895 | char *channel_name) | |
1896 | { | |
1897 | int ret; | |
1898 | struct ltt_kernel_channel *kchan; | |
1899 | ||
1900 | switch (domain) { | |
1901 | case LTTNG_DOMAIN_KERNEL: | |
1902 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1903 | session->kernel_session); | |
1904 | if (kchan == NULL) { | |
1905 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1906 | goto error; | |
26cc6b4e DG |
1907 | } |
1908 | ||
54d01ffb DG |
1909 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
1910 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 1911 | goto error; |
26cc6b4e DG |
1912 | } |
1913 | ||
54d01ffb | 1914 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 1915 | break; |
54d01ffb DG |
1916 | default: |
1917 | /* TODO: Userspace tracing */ | |
1918 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1919 | goto error; | |
26cc6b4e | 1920 | } |
e953ef25 | 1921 | |
54d01ffb | 1922 | ret = LTTCOMM_OK; |
e953ef25 | 1923 | |
54d01ffb DG |
1924 | error: |
1925 | return ret; | |
1926 | } | |
f5177a38 | 1927 | |
54d01ffb DG |
1928 | /* |
1929 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1930 | */ | |
1931 | static int cmd_add_context(struct ltt_session *session, int domain, | |
1932 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
1933 | { | |
1934 | int ret; | |
f5177a38 | 1935 | |
54d01ffb DG |
1936 | switch (domain) { |
1937 | case LTTNG_DOMAIN_KERNEL: | |
1938 | /* Add kernel context to kernel tracer */ | |
1939 | ret = context_kernel_add(session->kernel_session, ctx, | |
1940 | event_name, channel_name); | |
1941 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 1942 | goto error; |
e953ef25 DG |
1943 | } |
1944 | ||
e953ef25 | 1945 | break; |
54d01ffb DG |
1946 | default: |
1947 | /* TODO: Userspace tracing */ | |
1948 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1949 | goto error; | |
e953ef25 | 1950 | } |
950131af | 1951 | |
54d01ffb | 1952 | ret = LTTCOMM_OK; |
950131af | 1953 | |
54d01ffb DG |
1954 | error: |
1955 | return ret; | |
1956 | } | |
1957 | ||
1958 | /* | |
1959 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1960 | */ | |
1961 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
1962 | char *channel_name, struct lttng_event *event) | |
1963 | { | |
1964 | int ret; | |
1965 | struct ltt_kernel_channel *kchan; | |
1966 | ||
1967 | switch (domain) { | |
1968 | case LTTNG_DOMAIN_KERNEL: | |
1969 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1970 | session->kernel_session); | |
1971 | if (kchan == NULL) { | |
1972 | /* This call will notify the kernel thread */ | |
1973 | ret = channel_kernel_create(session->kernel_session, channel_name, | |
1974 | NULL, kernel_poll_pipe[1]); | |
1975 | if (ret != LTTCOMM_OK) { | |
f5177a38 DG |
1976 | goto error; |
1977 | } | |
54d01ffb | 1978 | } |
950131af | 1979 | |
54d01ffb DG |
1980 | /* Get the newly created kernel channel pointer */ |
1981 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1982 | session->kernel_session); | |
1983 | if (kchan == NULL) { | |
1984 | /* This sould not happen... */ | |
1985 | ret = LTTCOMM_FATAL; | |
1986 | goto error; | |
1987 | } | |
f5177a38 | 1988 | |
54d01ffb DG |
1989 | ret = event_kernel_enable(session->kernel_session, kchan, event); |
1990 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 1991 | goto error; |
950131af DG |
1992 | } |
1993 | ||
54d01ffb | 1994 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 1995 | break; |
54d01ffb DG |
1996 | default: |
1997 | /* TODO: Userspace tracing */ | |
1998 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1999 | goto error; | |
950131af | 2000 | } |
d36b8583 | 2001 | |
54d01ffb | 2002 | ret = LTTCOMM_OK; |
d36b8583 | 2003 | |
54d01ffb DG |
2004 | error: |
2005 | return ret; | |
2006 | } | |
7d29a247 | 2007 | |
54d01ffb DG |
2008 | /* |
2009 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2010 | */ | |
2011 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2012 | char *channel_name, int event_type) |
54d01ffb DG |
2013 | { |
2014 | int ret; | |
2015 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2016 | |
54d01ffb DG |
2017 | switch (domain) { |
2018 | case LTTNG_DOMAIN_KERNEL: | |
2019 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2020 | session->kernel_session); | |
2021 | if (kchan == NULL) { | |
2022 | /* This call will notify the kernel thread */ | |
2023 | ret = channel_kernel_create(session->kernel_session, channel_name, | |
2024 | NULL, kernel_poll_pipe[1]); | |
2025 | if (ret != LTTCOMM_OK) { | |
2026 | goto error; | |
d36b8583 | 2027 | } |
54d01ffb | 2028 | } |
0d0c377a | 2029 | |
54d01ffb DG |
2030 | /* Get the newly created kernel channel pointer */ |
2031 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2032 | session->kernel_session); | |
2033 | if (kchan == NULL) { | |
2034 | /* This sould not happen... */ | |
2035 | ret = LTTCOMM_FATAL; | |
2036 | goto error; | |
2037 | } | |
0fdd1e2c | 2038 | |
8c9ae521 DG |
2039 | if (event_type == LTTNG_KERNEL_SYSCALL) { |
2040 | ret = event_kernel_enable_syscalls(session->kernel_session, | |
2041 | kchan, kernel_tracer_fd); | |
2042 | } else { | |
2043 | /* | |
2044 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and events | |
2045 | * already registered to the channel. | |
2046 | */ | |
2047 | ret = event_kernel_enable_all(session->kernel_session, | |
2048 | kchan, kernel_tracer_fd); | |
2049 | } | |
2050 | ||
54d01ffb | 2051 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2052 | goto error; |
d36b8583 DG |
2053 | } |
2054 | ||
54d01ffb | 2055 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2056 | break; |
54d01ffb DG |
2057 | default: |
2058 | /* TODO: Userspace tracing */ | |
2059 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2060 | goto error; | |
d36b8583 | 2061 | } |
f3ed775e | 2062 | |
54d01ffb DG |
2063 | ret = LTTCOMM_OK; |
2064 | ||
2065 | error: | |
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2071 | */ | |
2072 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2073 | { | |
2074 | int ret; | |
2075 | ssize_t nb_events = 0; | |
2076 | ||
2077 | switch (domain) { | |
2078 | case LTTNG_DOMAIN_KERNEL: | |
2079 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2080 | if (nb_events < 0) { | |
2081 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2082 | goto error; | |
894be886 | 2083 | } |
54d01ffb DG |
2084 | break; |
2085 | default: | |
2086 | /* TODO: Userspace listing */ | |
2087 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2088 | goto error; | |
2089 | } | |
894be886 | 2090 | |
54d01ffb | 2091 | return nb_events; |
7d29a247 | 2092 | |
54d01ffb DG |
2093 | error: |
2094 | /* Return negative value to differentiate return code */ | |
2095 | return -ret; | |
2096 | } | |
b389abbe | 2097 | |
54d01ffb DG |
2098 | /* |
2099 | * Command LTTNG_START_TRACE processed by the client thread. | |
2100 | */ | |
2101 | static int cmd_start_trace(struct ltt_session *session) | |
2102 | { | |
2103 | int ret; | |
2104 | struct ltt_kernel_channel *kchan; | |
2105 | struct ltt_kernel_session *ksession; | |
b389abbe | 2106 | |
54d01ffb DG |
2107 | /* Short cut */ |
2108 | ksession = session->kernel_session; | |
5eb91c98 | 2109 | |
54d01ffb DG |
2110 | /* Kernel tracing */ |
2111 | if (ksession != NULL) { | |
2112 | /* Open kernel metadata */ | |
2113 | if (ksession->metadata == NULL) { | |
2114 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2115 | if (ret < 0) { | |
2116 | ret = LTTCOMM_KERN_META_FAIL; | |
2117 | goto error; | |
b389abbe | 2118 | } |
54d01ffb | 2119 | } |
7d29a247 | 2120 | |
54d01ffb DG |
2121 | /* Open kernel metadata stream */ |
2122 | if (ksession->metadata_stream_fd == 0) { | |
2123 | ret = kernel_open_metadata_stream(ksession); | |
2124 | if (ret < 0) { | |
2125 | ERR("Kernel create metadata stream failed"); | |
2126 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2127 | goto error; | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | /* For each channel */ | |
2132 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2133 | if (kchan->stream_count == 0) { | |
2134 | ret = kernel_open_channel_stream(kchan); | |
2135 | if (ret < 0) { | |
2136 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2137 | goto error; |
2138 | } | |
54d01ffb DG |
2139 | /* Update the stream global counter */ |
2140 | ksession->stream_count_global += ret; | |
7d29a247 | 2141 | } |
54d01ffb DG |
2142 | } |
2143 | ||
2144 | /* Setup kernel consumer socket and send fds to it */ | |
2145 | ret = init_kernel_tracing(ksession); | |
2146 | if (ret < 0) { | |
2147 | ret = LTTCOMM_KERN_START_FAIL; | |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | /* This start the kernel tracing */ | |
2152 | ret = kernel_start_session(ksession); | |
2153 | if (ret < 0) { | |
2154 | ret = LTTCOMM_KERN_START_FAIL; | |
2155 | goto error; | |
2156 | } | |
2157 | ||
2158 | /* Quiescent wait after starting trace */ | |
2159 | kernel_wait_quiescent(kernel_tracer_fd); | |
2160 | } | |
2161 | ||
2162 | /* TODO: Start all UST traces */ | |
2163 | ||
2164 | ret = LTTCOMM_OK; | |
2165 | ||
2166 | error: | |
2167 | return ret; | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2172 | */ | |
2173 | static int cmd_stop_trace(struct ltt_session *session) | |
2174 | { | |
2175 | int ret; | |
2176 | struct ltt_kernel_channel *kchan; | |
2177 | struct ltt_kernel_session *ksession; | |
2178 | ||
2179 | /* Short cut */ | |
2180 | ksession = session->kernel_session; | |
2181 | ||
2182 | /* Kernel tracer */ | |
2183 | if (ksession != NULL) { | |
2184 | DBG("Stop kernel tracing"); | |
2185 | ||
2186 | /* Flush all buffers before stopping */ | |
2187 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2188 | if (ret < 0) { | |
2189 | ERR("Kernel metadata flush failed"); | |
2190 | } | |
f34daff7 | 2191 | |
54d01ffb DG |
2192 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2193 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2194 | if (ret < 0) { |
54d01ffb | 2195 | ERR("Kernel flush buffer error"); |
7d29a247 | 2196 | } |
54d01ffb | 2197 | } |
19e70852 | 2198 | |
54d01ffb DG |
2199 | ret = kernel_stop_session(ksession); |
2200 | if (ret < 0) { | |
2201 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2202 | goto error; |
f3ed775e | 2203 | } |
54d01ffb DG |
2204 | |
2205 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2206 | } |
54d01ffb DG |
2207 | |
2208 | /* TODO : User-space tracer */ | |
2209 | ||
2210 | ret = LTTCOMM_OK; | |
2211 | ||
2212 | error: | |
2213 | return ret; | |
2214 | } | |
2215 | ||
2216 | /* | |
2217 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2218 | */ | |
2219 | static int cmd_create_session(char *name, char *path) | |
2220 | { | |
2221 | int ret; | |
2222 | ||
2223 | ret = session_create(name, path); | |
2224 | if (ret != LTTCOMM_OK) { | |
2225 | goto error; | |
2226 | } | |
2227 | ||
2228 | ret = LTTCOMM_OK; | |
2229 | ||
2230 | error: | |
2231 | return ret; | |
2232 | } | |
2233 | ||
2234 | /* | |
2235 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2236 | */ | |
2237 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2238 | { | |
2239 | int ret; | |
2240 | ||
2241 | /* Clean kernel session teardown */ | |
2242 | teardown_kernel_session(session); | |
2243 | ||
2244 | /* | |
2245 | * Must notify the kernel thread here to update it's poll setin order | |
2246 | * to remove the channel(s)' fd just destroyed. | |
2247 | */ | |
2248 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2249 | if (ret < 0) { | |
2250 | perror("write kernel poll pipe"); | |
2251 | } | |
2252 | ||
2253 | ret = session_destroy(name); | |
2254 | ||
2255 | return ret; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2260 | */ | |
2261 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2262 | { | |
2263 | int ret; | |
2264 | ||
2265 | switch (domain) { | |
2266 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2267 | { |
54d01ffb | 2268 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2269 | |
54d01ffb DG |
2270 | kcalibrate.type = calibrate->type; |
2271 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2272 | if (ret < 0) { |
54d01ffb DG |
2273 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2274 | goto error; | |
33a2b854 | 2275 | } |
54d01ffb DG |
2276 | break; |
2277 | } | |
2278 | default: | |
2279 | /* TODO: Userspace tracing */ | |
2280 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2281 | goto error; | |
2282 | } | |
33a2b854 | 2283 | |
54d01ffb | 2284 | ret = LTTCOMM_OK; |
33a2b854 | 2285 | |
54d01ffb DG |
2286 | error: |
2287 | return ret; | |
2288 | } | |
7d29a247 | 2289 | |
54d01ffb DG |
2290 | /* |
2291 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2292 | */ | |
2293 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2294 | char *sock_path) | |
2295 | { | |
2296 | int ret, sock; | |
b389abbe | 2297 | |
54d01ffb DG |
2298 | switch (domain) { |
2299 | case LTTNG_DOMAIN_KERNEL: | |
2300 | /* Can't register a consumer if there is already one */ | |
2301 | if (session->kernel_session->consumer_fd != 0) { | |
2302 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2303 | goto error; | |
2304 | } | |
2305 | ||
2306 | sock = lttcomm_connect_unix_sock(sock_path); | |
2307 | if (sock < 0) { | |
2308 | ret = LTTCOMM_CONNECT_FAIL; | |
2309 | goto error; | |
2310 | } | |
2311 | ||
2312 | session->kernel_session->consumer_fd = sock; | |
2313 | break; | |
2314 | default: | |
2315 | /* TODO: Userspace tracing */ | |
2316 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2317 | goto error; | |
2318 | } | |
2319 | ||
2320 | ret = LTTCOMM_OK; | |
2321 | ||
2322 | error: | |
2323 | return ret; | |
2324 | } | |
2325 | ||
2326 | /* | |
2327 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2328 | */ | |
2329 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2330 | struct lttng_domain **domains) | |
2331 | { | |
2332 | int ret; | |
2333 | ssize_t nb_dom = 0; | |
2334 | ||
2335 | if (session->kernel_session != NULL) { | |
2336 | nb_dom++; | |
2337 | } | |
2338 | ||
2339 | nb_dom += session->ust_session_list.count; | |
2340 | ||
2341 | *domains = malloc(nb_dom * sizeof(struct lttng_domain)); | |
2342 | if (*domains == NULL) { | |
2343 | ret = -LTTCOMM_FATAL; | |
2344 | goto error; | |
2345 | } | |
2346 | ||
2347 | (*domains)[0].type = LTTNG_DOMAIN_KERNEL; | |
2348 | ||
2349 | /* TODO: User-space tracer domain support */ | |
2350 | ||
2351 | return nb_dom; | |
2352 | ||
2353 | error: | |
2354 | return ret; | |
2355 | } | |
2356 | ||
2357 | /* | |
2358 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2359 | */ | |
2360 | static ssize_t cmd_list_channels(struct ltt_session *session, | |
2361 | struct lttng_channel **channels) | |
2362 | { | |
2363 | int ret; | |
2364 | ssize_t nb_chan = 0; | |
2365 | ||
2366 | if (session->kernel_session != NULL) { | |
2367 | nb_chan += session->kernel_session->channel_count; | |
2368 | } | |
2369 | ||
2370 | *channels = malloc(nb_chan * sizeof(struct lttng_channel)); | |
2371 | if (*channels == NULL) { | |
2372 | ret = -LTTCOMM_FATAL; | |
2373 | goto error; | |
2374 | } | |
2375 | ||
2376 | list_lttng_channels(session, *channels); | |
2377 | ||
2378 | return nb_chan; | |
2379 | ||
2380 | error: | |
2381 | return ret; | |
2382 | } | |
2383 | ||
2384 | /* | |
2385 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2386 | */ | |
2387 | static ssize_t cmd_list_events(struct ltt_session *session, | |
2388 | char *channel_name, struct lttng_event **events) | |
2389 | { | |
2390 | int ret; | |
2391 | ssize_t nb_event = 0; | |
2392 | struct ltt_kernel_channel *kchan = NULL; | |
2393 | ||
2394 | if (session->kernel_session != NULL) { | |
2395 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2396 | session->kernel_session); | |
2397 | if (kchan == NULL) { | |
2398 | ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2399 | goto error; | |
2400 | } | |
2401 | nb_event += kchan->event_count; | |
2402 | } | |
2403 | ||
2404 | *events = malloc(nb_event * sizeof(struct lttng_event)); | |
2405 | if (*events == NULL) { | |
2406 | ret = -LTTCOMM_FATAL; | |
2407 | goto error; | |
2408 | } | |
2409 | ||
2410 | list_lttng_events(kchan, *events); | |
2411 | ||
2412 | /* TODO: User-space tracer support */ | |
2413 | ||
2414 | return nb_event; | |
2415 | ||
2416 | error: | |
2417 | return ret; | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Process the command requested by the lttng client within the command | |
2422 | * context structure. This function make sure that the return structure (llm) | |
2423 | * is set and ready for transmission before returning. | |
2424 | * | |
2425 | * Return any error encountered or 0 for success. | |
2426 | */ | |
2427 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2428 | { | |
2429 | int ret = LTTCOMM_OK; | |
2430 | int need_kernel_session = 1; | |
2431 | ||
2432 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2433 | ||
2434 | /* | |
2435 | * Check for command that don't needs to allocate a returned payload. We do | |
2436 | * this here so we don't have to make the call for no payload" at each | |
2437 | * command. | |
2438 | */ | |
2439 | switch(cmd_ctx->lsm->cmd_type) { | |
2440 | case LTTNG_LIST_SESSIONS: | |
2441 | case LTTNG_LIST_TRACEPOINTS: | |
2442 | case LTTNG_LIST_DOMAINS: | |
2443 | case LTTNG_LIST_CHANNELS: | |
2444 | case LTTNG_LIST_EVENTS: | |
2445 | break; | |
2446 | default: | |
2447 | /* Setup lttng message with no payload */ | |
2448 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2449 | if (ret < 0) { | |
2450 | /* This label does not try to unlock the session */ | |
2451 | goto init_setup_error; | |
2452 | } | |
2453 | } | |
2454 | ||
2455 | /* Commands that DO NOT need a session. */ | |
2456 | switch (cmd_ctx->lsm->cmd_type) { | |
2457 | case LTTNG_CALIBRATE: | |
2458 | case LTTNG_CREATE_SESSION: | |
2459 | case LTTNG_LIST_SESSIONS: | |
2460 | case LTTNG_LIST_TRACEPOINTS: | |
2461 | need_kernel_session = 0; | |
2462 | break; | |
2463 | default: | |
2464 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
2465 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
2466 | if (cmd_ctx->session == NULL) { | |
2467 | if (cmd_ctx->lsm->session.name != NULL) { | |
2468 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2469 | } else { | |
2470 | /* If no session name specified */ | |
2471 | ret = LTTCOMM_SELECT_SESS; | |
2472 | } | |
2473 | goto error; | |
2474 | } else { | |
2475 | /* Acquire lock for the session */ | |
2476 | session_lock(cmd_ctx->session); | |
2477 | } | |
2478 | break; | |
2479 | } | |
b389abbe | 2480 | |
54d01ffb DG |
2481 | /* |
2482 | * Check domain type for specific "pre-action". | |
2483 | */ | |
2484 | switch (cmd_ctx->lsm->domain.type) { | |
2485 | case LTTNG_DOMAIN_KERNEL: | |
2486 | /* Kernel tracer check */ | |
2487 | if (kernel_tracer_fd == 0) { | |
2488 | /* Basically, load kernel tracer modules */ | |
2489 | init_kernel_tracer(); | |
2490 | if (kernel_tracer_fd == 0) { | |
2491 | ret = LTTCOMM_KERN_NA; | |
2492 | goto error; | |
2493 | } | |
2494 | } | |
5eb91c98 | 2495 | |
54d01ffb DG |
2496 | /* Need a session for kernel command */ |
2497 | if (need_kernel_session) { | |
2498 | if (cmd_ctx->session->kernel_session == NULL) { | |
2499 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2500 | if (ret < 0) { |
54d01ffb | 2501 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2502 | goto error; |
2503 | } | |
b389abbe | 2504 | } |
7d29a247 | 2505 | |
54d01ffb DG |
2506 | /* Start the kernel consumer daemon */ |
2507 | if (kconsumerd_pid == 0 && | |
2508 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
2509 | ret = start_kconsumerd(); | |
7d29a247 | 2510 | if (ret < 0) { |
54d01ffb DG |
2511 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2512 | goto error; | |
950131af | 2513 | } |
33a2b854 | 2514 | } |
0d0c377a | 2515 | } |
54d01ffb DG |
2516 | break; |
2517 | default: | |
2518 | /* TODO Userspace tracer */ | |
2519 | break; | |
2520 | } | |
33a2b854 | 2521 | |
54d01ffb DG |
2522 | /* Process by command type */ |
2523 | switch (cmd_ctx->lsm->cmd_type) { | |
2524 | case LTTNG_ADD_CONTEXT: | |
2525 | { | |
2526 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2527 | cmd_ctx->lsm->u.context.channel_name, | |
2528 | cmd_ctx->lsm->u.context.event_name, | |
2529 | &cmd_ctx->lsm->u.context.ctx); | |
2530 | break; | |
2531 | } | |
2532 | case LTTNG_DISABLE_CHANNEL: | |
2533 | { | |
2534 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2535 | cmd_ctx->lsm->u.disable.channel_name); | |
2536 | break; | |
2537 | } | |
2538 | case LTTNG_DISABLE_EVENT: | |
2539 | { | |
2540 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2541 | cmd_ctx->lsm->u.disable.channel_name, | |
2542 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2543 | ret = LTTCOMM_OK; |
2544 | break; | |
2545 | } | |
54d01ffb DG |
2546 | case LTTNG_DISABLE_ALL_EVENT: |
2547 | { | |
2548 | DBG("Disabling all kernel event"); | |
2549 | ||
2550 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2551 | cmd_ctx->lsm->u.disable.channel_name); | |
2552 | break; | |
2553 | } | |
2554 | case LTTNG_ENABLE_CHANNEL: | |
2555 | { | |
2556 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2557 | cmd_ctx->lsm->u.enable.channel_name, | |
2558 | &cmd_ctx->lsm->u.channel.chan); | |
2559 | break; | |
2560 | } | |
2561 | case LTTNG_ENABLE_EVENT: | |
2562 | { | |
2563 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2564 | cmd_ctx->lsm->u.enable.channel_name, | |
2565 | &cmd_ctx->lsm->u.enable.event); | |
2566 | break; | |
2567 | } | |
2568 | case LTTNG_ENABLE_ALL_EVENT: | |
2569 | { | |
2570 | DBG("Enabling all kernel event"); | |
2571 | ||
2572 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
2573 | cmd_ctx->lsm->u.enable.channel_name, |
2574 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
2575 | break; |
2576 | } | |
052da939 | 2577 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2578 | { |
9f19cc17 | 2579 | struct lttng_event *events; |
54d01ffb | 2580 | ssize_t nb_events; |
052da939 | 2581 | |
54d01ffb DG |
2582 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2583 | if (nb_events < 0) { | |
2584 | ret = -nb_events; | |
2585 | goto error; | |
2ef84c95 DG |
2586 | } |
2587 | ||
2588 | /* | |
2589 | * Setup lttng message with payload size set to the event list size in | |
2590 | * bytes and then copy list into the llm payload. | |
2591 | */ | |
052da939 | 2592 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2593 | if (ret < 0) { |
052da939 | 2594 | free(events); |
2ef84c95 DG |
2595 | goto setup_error; |
2596 | } | |
2597 | ||
2598 | /* Copy event list into message payload */ | |
9f19cc17 | 2599 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2600 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2601 | |
9f19cc17 | 2602 | free(events); |
2ef84c95 DG |
2603 | |
2604 | ret = LTTCOMM_OK; | |
2605 | break; | |
2606 | } | |
f3ed775e | 2607 | case LTTNG_START_TRACE: |
8c0faa1d | 2608 | { |
54d01ffb | 2609 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2610 | break; |
2611 | } | |
f3ed775e | 2612 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2613 | { |
54d01ffb | 2614 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2615 | break; |
2616 | } | |
5e16da05 MD |
2617 | case LTTNG_CREATE_SESSION: |
2618 | { | |
3c6bae61 | 2619 | tracepoint(create_session_start); |
54d01ffb DG |
2620 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
2621 | cmd_ctx->lsm->session.path); | |
3c6bae61 | 2622 | tracepoint(create_session_end); |
5e16da05 MD |
2623 | break; |
2624 | } | |
2625 | case LTTNG_DESTROY_SESSION: | |
2626 | { | |
3c6bae61 | 2627 | tracepoint(destroy_session_start); |
54d01ffb DG |
2628 | ret = cmd_destroy_session(cmd_ctx->session, |
2629 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 2630 | tracepoint(destroy_session_end); |
5461b305 | 2631 | break; |
5e16da05 | 2632 | } |
9f19cc17 | 2633 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2634 | { |
54d01ffb DG |
2635 | ssize_t nb_dom; |
2636 | struct lttng_domain *domains; | |
5461b305 | 2637 | |
54d01ffb DG |
2638 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2639 | if (nb_dom < 0) { | |
2640 | ret = -nb_dom; | |
2641 | goto error; | |
ce3d728c | 2642 | } |
520ff687 | 2643 | |
54d01ffb | 2644 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2645 | if (ret < 0) { |
2646 | goto setup_error; | |
520ff687 | 2647 | } |
57167058 | 2648 | |
54d01ffb DG |
2649 | /* Copy event list into message payload */ |
2650 | memcpy(cmd_ctx->llm->payload, domains, | |
2651 | nb_dom * sizeof(struct lttng_domain)); | |
2652 | ||
2653 | free(domains); | |
5e16da05 | 2654 | |
5461b305 | 2655 | ret = LTTCOMM_OK; |
5e16da05 MD |
2656 | break; |
2657 | } | |
9f19cc17 | 2658 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2659 | { |
54d01ffb DG |
2660 | size_t nb_chan; |
2661 | struct lttng_channel *channels; | |
2662 | ||
2663 | nb_chan = cmd_list_channels(cmd_ctx->session, &channels); | |
2664 | if (nb_chan < 0) { | |
2665 | ret = -nb_chan; | |
2666 | goto error; | |
5461b305 | 2667 | } |
ca95a216 | 2668 | |
54d01ffb | 2669 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2670 | if (ret < 0) { |
2671 | goto setup_error; | |
2672 | } | |
9f19cc17 | 2673 | |
54d01ffb DG |
2674 | /* Copy event list into message payload */ |
2675 | memcpy(cmd_ctx->llm->payload, channels, | |
2676 | nb_chan * sizeof(struct lttng_channel)); | |
2677 | ||
2678 | free(channels); | |
9f19cc17 DG |
2679 | |
2680 | ret = LTTCOMM_OK; | |
5461b305 | 2681 | break; |
5e16da05 | 2682 | } |
9f19cc17 | 2683 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2684 | { |
54d01ffb | 2685 | size_t nb_event; |
684d34d2 | 2686 | struct lttng_event *events = NULL; |
9f19cc17 | 2687 | |
54d01ffb DG |
2688 | nb_event = cmd_list_events(cmd_ctx->session, |
2689 | cmd_ctx->lsm->u.list.channel_name, &events); | |
2690 | if (nb_event < 0) { | |
2691 | ret = -nb_event; | |
2692 | goto error; | |
5461b305 | 2693 | } |
ca95a216 | 2694 | |
54d01ffb | 2695 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2696 | if (ret < 0) { |
2697 | goto setup_error; | |
2698 | } | |
9f19cc17 | 2699 | |
54d01ffb DG |
2700 | /* Copy event list into message payload */ |
2701 | memcpy(cmd_ctx->llm->payload, events, | |
2702 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2703 | |
54d01ffb | 2704 | free(events); |
9f19cc17 DG |
2705 | |
2706 | ret = LTTCOMM_OK; | |
5461b305 | 2707 | break; |
5e16da05 MD |
2708 | } |
2709 | case LTTNG_LIST_SESSIONS: | |
2710 | { | |
54d01ffb | 2711 | session_lock_list(); |
5461b305 | 2712 | |
6c9cc2ab | 2713 | if (session_list_ptr->count == 0) { |
f3ed775e | 2714 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 2715 | session_unlock_list(); |
5461b305 | 2716 | goto error; |
57167058 | 2717 | } |
5e16da05 | 2718 | |
6c9cc2ab DG |
2719 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2720 | session_list_ptr->count); | |
5461b305 | 2721 | if (ret < 0) { |
54d01ffb | 2722 | session_unlock_list(); |
5461b305 | 2723 | goto setup_error; |
e065084a | 2724 | } |
5e16da05 | 2725 | |
6c9cc2ab DG |
2726 | /* Filled the session array */ |
2727 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2728 | ||
54d01ffb | 2729 | session_unlock_list(); |
5e16da05 | 2730 | |
5461b305 | 2731 | ret = LTTCOMM_OK; |
5e16da05 MD |
2732 | break; |
2733 | } | |
d0254c7c MD |
2734 | case LTTNG_CALIBRATE: |
2735 | { | |
54d01ffb DG |
2736 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2737 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2738 | break; |
2739 | } | |
d9800920 DG |
2740 | case LTTNG_REGISTER_CONSUMER: |
2741 | { | |
54d01ffb DG |
2742 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2743 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
2744 | break; |
2745 | } | |
5e16da05 | 2746 | default: |
5e16da05 | 2747 | ret = LTTCOMM_UND; |
5461b305 | 2748 | break; |
fac6795d DG |
2749 | } |
2750 | ||
5461b305 | 2751 | error: |
5461b305 DG |
2752 | if (cmd_ctx->llm == NULL) { |
2753 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2754 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2755 | goto setup_error; |
2756 | } | |
2757 | } | |
54d01ffb | 2758 | /* Set return code */ |
5461b305 | 2759 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2760 | setup_error: |
b5541356 | 2761 | if (cmd_ctx->session) { |
54d01ffb | 2762 | session_unlock(cmd_ctx->session); |
b5541356 | 2763 | } |
54d01ffb | 2764 | init_setup_error: |
8028d920 | 2765 | return ret; |
fac6795d DG |
2766 | } |
2767 | ||
1d4b027a | 2768 | /* |
d063d709 DG |
2769 | * This thread manage all clients request using the unix client socket for |
2770 | * communication. | |
1d4b027a DG |
2771 | */ |
2772 | static void *thread_manage_clients(void *data) | |
2773 | { | |
5eb91c98 DG |
2774 | int sock = 0, ret, i, pollfd; |
2775 | uint32_t revents, nb_fd; | |
273ea72c | 2776 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 2777 | struct lttng_poll_event events; |
1d4b027a | 2778 | |
b25a8868 DG |
2779 | tracepoint(sessiond_th_cli_start); |
2780 | ||
1d4b027a DG |
2781 | DBG("[thread] Manage client started"); |
2782 | ||
2783 | ret = lttcomm_listen_unix_sock(client_sock); | |
2784 | if (ret < 0) { | |
2785 | goto error; | |
2786 | } | |
2787 | ||
5eb91c98 DG |
2788 | /* |
2789 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2790 | * more will be added to this poll set. | |
2791 | */ | |
2792 | ret = create_thread_poll_set(&events, 2); | |
2793 | if (ret < 0) { | |
2794 | goto error; | |
2795 | } | |
273ea72c | 2796 | |
5eb91c98 DG |
2797 | /* Add the application registration socket */ |
2798 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2799 | if (ret < 0) { | |
2800 | goto error; | |
2801 | } | |
273ea72c | 2802 | |
bbd973c2 DG |
2803 | /* |
2804 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2805 | */ |
2806 | if (opt_sig_parent) { | |
2807 | kill(ppid, SIGCHLD); | |
2808 | } | |
2809 | ||
2810 | while (1) { | |
1d4b027a | 2811 | DBG("Accepting client command ..."); |
273ea72c | 2812 | |
b25a8868 DG |
2813 | tracepoint(sessiond_th_cli_poll); |
2814 | ||
5eb91c98 DG |
2815 | nb_fd = LTTNG_POLL_GETNB(&events); |
2816 | ||
273ea72c | 2817 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 2818 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 2819 | if (ret < 0) { |
273ea72c DG |
2820 | goto error; |
2821 | } | |
2822 | ||
5eb91c98 DG |
2823 | for (i = 0; i < nb_fd; i++) { |
2824 | /* Fetch once the poll data */ | |
2825 | revents = LTTNG_POLL_GETEV(&events, i); | |
2826 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2827 | ||
2828 | /* Thread quit pipe has been closed. Killing thread. */ | |
2829 | ret = check_thread_quit_pipe(pollfd, revents); | |
2830 | if (ret) { | |
2831 | goto error; | |
2832 | } | |
2833 | ||
2834 | /* Event on the registration socket */ | |
2835 | if (pollfd == client_sock) { | |
2836 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2837 | ERR("Client socket poll error"); | |
2838 | goto error; | |
2839 | } | |
2840 | } | |
273ea72c DG |
2841 | } |
2842 | ||
5eb91c98 DG |
2843 | DBG("Wait for client response"); |
2844 | ||
1d4b027a DG |
2845 | sock = lttcomm_accept_unix_sock(client_sock); |
2846 | if (sock < 0) { | |
2847 | goto error; | |
2848 | } | |
2849 | ||
2850 | /* Allocate context command to process the client request */ | |
2851 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
5eb91c98 DG |
2852 | if (cmd_ctx == NULL) { |
2853 | perror("malloc cmd_ctx"); | |
1d4b027a | 2854 | goto error; |
5eb91c98 | 2855 | } |
1d4b027a DG |
2856 | |
2857 | /* Allocate data buffer for reception */ | |
2858 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
5eb91c98 DG |
2859 | if (cmd_ctx->lsm == NULL) { |
2860 | perror("malloc cmd_ctx->lsm"); | |
2861 | goto error; | |
2862 | } | |
1d4b027a | 2863 | |
1d4b027a DG |
2864 | cmd_ctx->llm = NULL; |
2865 | cmd_ctx->session = NULL; | |
2866 | ||
2867 | /* | |
2868 | * Data is received from the lttng client. The struct | |
2869 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2870 | * the client. | |
2871 | */ | |
2872 | DBG("Receiving data from client ..."); | |
5eb91c98 DG |
2873 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
2874 | sizeof(struct lttcomm_session_msg)); | |
1d4b027a | 2875 | if (ret <= 0) { |
5eb91c98 DG |
2876 | DBG("Nothing recv() from client... continuing"); |
2877 | close(sock); | |
2878 | free(cmd_ctx); | |
1d4b027a DG |
2879 | continue; |
2880 | } | |
2881 | ||
5eb91c98 DG |
2882 | // TODO: Validate cmd_ctx including sanity check for |
2883 | // security purpose. | |
f7776ea7 | 2884 | |
1d4b027a DG |
2885 | /* |
2886 | * This function dispatch the work to the kernel or userspace tracer | |
2887 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2888 | * informations for the client. The command context struct contains | |
2889 | * everything this function may needs. | |
2890 | */ | |
2891 | ret = process_client_msg(cmd_ctx); | |
2892 | if (ret < 0) { | |
bbd973c2 | 2893 | /* |
5eb91c98 DG |
2894 | * TODO: Inform client somehow of the fatal error. At |
2895 | * this point, ret < 0 means that a malloc failed | |
2896 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 2897 | */ |
a2fb29a5 | 2898 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2899 | continue; |
2900 | } | |
2901 | ||
54d01ffb DG |
2902 | DBG("Sending response (size: %d, retcode: %s)", |
2903 | cmd_ctx->lttng_msg_size, | |
532d79a7 | 2904 | lttng_get_readable_code(-cmd_ctx->llm->ret_code)); |
54d01ffb | 2905 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
2906 | if (ret < 0) { |
2907 | ERR("Failed to send data back to client"); | |
2908 | } | |
2909 | ||
a2fb29a5 | 2910 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2911 | |
2912 | /* End of transmission */ | |
2913 | close(sock); | |
1d4b027a DG |
2914 | } |
2915 | ||
2916 | error: | |
273ea72c | 2917 | DBG("Client thread dying"); |
273ea72c | 2918 | unlink(client_unix_sock_path); |
5eb91c98 DG |
2919 | close(client_sock); |
2920 | close(sock); | |
273ea72c | 2921 | |
5eb91c98 | 2922 | lttng_poll_clean(&events); |
a2fb29a5 | 2923 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2924 | return NULL; |
2925 | } | |
2926 | ||
2927 | ||
fac6795d DG |
2928 | /* |
2929 | * usage function on stderr | |
2930 | */ | |
2931 | static void usage(void) | |
2932 | { | |
b716ce68 | 2933 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2934 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2935 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2936 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2937 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2938 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2939 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2940 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2941 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2942 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2943 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2944 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2945 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2946 | } |
2947 | ||
2948 | /* | |
2949 | * daemon argument parsing | |
2950 | */ | |
2951 | static int parse_args(int argc, char **argv) | |
2952 | { | |
2953 | int c; | |
2954 | ||
2955 | static struct option long_options[] = { | |
2956 | { "client-sock", 1, 0, 'c' }, | |
2957 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2958 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2959 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2960 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2961 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2962 | { "help", 0, 0, 'h' }, |
2963 | { "group", 1, 0, 'g' }, | |
2964 | { "version", 0, 0, 'V' }, | |
75462a81 | 2965 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2966 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2967 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2968 | { NULL, 0, 0, 0 } |
2969 | }; | |
2970 | ||
2971 | while (1) { | |
2972 | int option_index = 0; | |
54d01ffb DG |
2973 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", |
2974 | long_options, &option_index); | |
fac6795d DG |
2975 | if (c == -1) { |
2976 | break; | |
2977 | } | |
2978 | ||
2979 | switch (c) { | |
2980 | case 0: | |
2981 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2982 | if (optarg) { | |
2983 | fprintf(stderr, " with arg %s\n", optarg); | |
2984 | } | |
2985 | break; | |
b716ce68 | 2986 | case 'c': |
fac6795d DG |
2987 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2988 | break; | |
2989 | case 'a': | |
2990 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2991 | break; | |
2992 | case 'd': | |
2993 | opt_daemon = 1; | |
2994 | break; | |
2995 | case 'g': | |
2996 | opt_tracing_group = strdup(optarg); | |
2997 | break; | |
2998 | case 'h': | |
2999 | usage(); | |
3000 | exit(EXIT_FAILURE); | |
3001 | case 'V': | |
3002 | fprintf(stdout, "%s\n", VERSION); | |
3003 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3004 | case 'S': |
3005 | opt_sig_parent = 1; | |
3006 | break; | |
d6f42150 DG |
3007 | case 'E': |
3008 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3009 | break; | |
3010 | case 'C': | |
3011 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
3012 | break; | |
75462a81 DG |
3013 | case 'q': |
3014 | opt_quiet = 1; | |
3015 | break; | |
3f9947db | 3016 | case 'v': |
53086306 DG |
3017 | /* Verbose level can increase using multiple -v */ |
3018 | opt_verbose += 1; | |
3f9947db | 3019 | break; |
31f73cc9 MD |
3020 | case 'Z': |
3021 | opt_verbose_kconsumerd += 1; | |
3022 | break; | |
fac6795d DG |
3023 | default: |
3024 | /* Unknown option or other error. | |
3025 | * Error is printed by getopt, just return */ | |
3026 | return -1; | |
3027 | } | |
3028 | } | |
3029 | ||
3030 | return 0; | |
3031 | } | |
3032 | ||
3033 | /* | |
d063d709 | 3034 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3035 | * apps_sock - The communication socket for all UST apps. |
3036 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3037 | */ |
cf3af59e | 3038 | static int init_daemon_socket(void) |
fac6795d DG |
3039 | { |
3040 | int ret = 0; | |
3041 | mode_t old_umask; | |
3042 | ||
3043 | old_umask = umask(0); | |
3044 | ||
3045 | /* Create client tool unix socket */ | |
d6f42150 DG |
3046 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3047 | if (client_sock < 0) { | |
3048 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3049 | ret = -1; |
3050 | goto end; | |
3051 | } | |
3052 | ||
3053 | /* File permission MUST be 660 */ | |
3054 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3055 | if (ret < 0) { | |
d6f42150 | 3056 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3057 | perror("chmod"); |
3058 | goto end; | |
3059 | } | |
3060 | ||
3061 | /* Create the application unix socket */ | |
d6f42150 DG |
3062 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3063 | if (apps_sock < 0) { | |
3064 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3065 | ret = -1; |
3066 | goto end; | |
3067 | } | |
3068 | ||
d6f42150 | 3069 | /* File permission MUST be 666 */ |
54d01ffb DG |
3070 | ret = chmod(apps_unix_sock_path, |
3071 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3072 | if (ret < 0) { |
d6f42150 | 3073 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3074 | perror("chmod"); |
3075 | goto end; | |
3076 | } | |
3077 | ||
3078 | end: | |
3079 | umask(old_umask); | |
3080 | return ret; | |
3081 | } | |
3082 | ||
3083 | /* | |
54d01ffb DG |
3084 | * Check if the global socket is available, and if a daemon is answering at the |
3085 | * other side. If yes, error is returned. | |
fac6795d | 3086 | */ |
cf3af59e | 3087 | static int check_existing_daemon(void) |
fac6795d | 3088 | { |
7d8234d9 | 3089 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3090 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3091 | return 0; |
099e26bd | 3092 | } |
54d01ffb | 3093 | |
7d8234d9 | 3094 | /* Is there anybody out there ? */ |
099e26bd | 3095 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3096 | return -EEXIST; |
099e26bd | 3097 | } else { |
7d8234d9 | 3098 | return 0; |
099e26bd | 3099 | } |
fac6795d DG |
3100 | } |
3101 | ||
fac6795d | 3102 | /* |
d063d709 | 3103 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3104 | * |
d063d709 DG |
3105 | * Race window between mkdir and chown is OK because we are going from more |
3106 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3107 | */ |
d6f42150 | 3108 | static int set_permissions(void) |
fac6795d DG |
3109 | { |
3110 | int ret; | |
996b65c8 | 3111 | gid_t gid; |
fac6795d | 3112 | |
996b65c8 MD |
3113 | gid = allowed_group(); |
3114 | if (gid < 0) { | |
a463f419 DG |
3115 | if (is_root) { |
3116 | WARN("No tracing group detected"); | |
3117 | ret = 0; | |
3118 | } else { | |
3119 | ERR("Missing tracing group. Aborting execution."); | |
3120 | ret = -1; | |
3121 | } | |
fac6795d DG |
3122 | goto end; |
3123 | } | |
3124 | ||
d6f42150 | 3125 | /* Set lttng run dir */ |
996b65c8 | 3126 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3127 | if (ret < 0) { |
3128 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3129 | perror("chown"); | |
3130 | } | |
3131 | ||
3132 | /* lttng client socket path */ | |
996b65c8 | 3133 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3134 | if (ret < 0) { |
d6f42150 DG |
3135 | ERR("Unable to set group on %s", client_unix_sock_path); |
3136 | perror("chown"); | |
3137 | } | |
3138 | ||
3139 | /* kconsumerd error socket path */ | |
996b65c8 | 3140 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
3141 | if (ret < 0) { |
3142 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
3143 | perror("chown"); |
3144 | } | |
3145 | ||
d6f42150 | 3146 | DBG("All permissions are set"); |
e07ae692 | 3147 | |
fac6795d DG |
3148 | end: |
3149 | return ret; | |
3150 | } | |
3151 | ||
7a485870 | 3152 | /* |
d063d709 | 3153 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3154 | */ |
3155 | static int create_kernel_poll_pipe(void) | |
3156 | { | |
3157 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3158 | } | |
3159 | ||
099e26bd DG |
3160 | /* |
3161 | * Create the application command pipe to wake thread_manage_apps. | |
3162 | */ | |
3163 | static int create_apps_cmd_pipe(void) | |
3164 | { | |
3165 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3166 | } | |
3167 | ||
d6f42150 | 3168 | /* |
d063d709 | 3169 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3170 | */ |
3171 | static int create_lttng_rundir(void) | |
3172 | { | |
3173 | int ret; | |
3174 | ||
3175 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3176 | if (ret < 0) { | |
b1f11e69 DG |
3177 | if (errno != EEXIST) { |
3178 | ERR("Unable to create " LTTNG_RUNDIR); | |
3179 | goto error; | |
3180 | } else { | |
3181 | ret = 0; | |
3182 | } | |
d6f42150 DG |
3183 | } |
3184 | ||
3185 | error: | |
3186 | return ret; | |
3187 | } | |
3188 | ||
3189 | /* | |
d063d709 DG |
3190 | * Setup sockets and directory needed by the kconsumerd communication with the |
3191 | * session daemon. | |
d6f42150 DG |
3192 | */ |
3193 | static int set_kconsumerd_sockets(void) | |
3194 | { | |
3195 | int ret; | |
3196 | ||
3197 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
54d01ffb DG |
3198 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, |
3199 | KCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3200 | } |
3201 | ||
3202 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
54d01ffb DG |
3203 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, |
3204 | KCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3205 | } |
3206 | ||
3207 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3208 | if (ret < 0) { | |
6beb2242 DG |
3209 | if (errno != EEXIST) { |
3210 | ERR("Failed to create " KCONSUMERD_PATH); | |
3211 | goto error; | |
3212 | } | |
3213 | ret = 0; | |
d6f42150 DG |
3214 | } |
3215 | ||
3216 | /* Create the kconsumerd error unix socket */ | |
54d01ffb DG |
3217 | kconsumerd_err_sock = |
3218 | lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
d6f42150 DG |
3219 | if (kconsumerd_err_sock < 0) { |
3220 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3221 | ret = -1; | |
3222 | goto error; | |
3223 | } | |
3224 | ||
3225 | /* File permission MUST be 660 */ | |
54d01ffb DG |
3226 | ret = chmod(kconsumerd_err_unix_sock_path, |
3227 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
d6f42150 DG |
3228 | if (ret < 0) { |
3229 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3230 | perror("chmod"); | |
3231 | goto error; | |
3232 | } | |
3233 | ||
3234 | error: | |
3235 | return ret; | |
3236 | } | |
3237 | ||
fac6795d | 3238 | /* |
d063d709 | 3239 | * Signal handler for the daemon |
cf3af59e | 3240 | * |
54d01ffb DG |
3241 | * Simply stop all worker threads, leaving main() return gracefully after |
3242 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3243 | */ |
3244 | static void sighandler(int sig) | |
3245 | { | |
3246 | switch (sig) { | |
cf3af59e MD |
3247 | case SIGPIPE: |
3248 | DBG("SIGPIPE catched"); | |
3249 | return; | |
3250 | case SIGINT: | |
3251 | DBG("SIGINT catched"); | |
3252 | stop_threads(); | |
3253 | break; | |
3254 | case SIGTERM: | |
3255 | DBG("SIGTERM catched"); | |
3256 | stop_threads(); | |
3257 | break; | |
3258 | default: | |
3259 | break; | |
fac6795d | 3260 | } |
fac6795d DG |
3261 | } |
3262 | ||
3263 | /* | |
d063d709 | 3264 | * Setup signal handler for : |
1d4b027a | 3265 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3266 | */ |
1d4b027a | 3267 | static int set_signal_handler(void) |
fac6795d | 3268 | { |
1d4b027a DG |
3269 | int ret = 0; |
3270 | struct sigaction sa; | |
3271 | sigset_t sigset; | |
fac6795d | 3272 | |
1d4b027a DG |
3273 | if ((ret = sigemptyset(&sigset)) < 0) { |
3274 | perror("sigemptyset"); | |
3275 | return ret; | |
3276 | } | |
d6f42150 | 3277 | |
1d4b027a DG |
3278 | sa.sa_handler = sighandler; |
3279 | sa.sa_mask = sigset; | |
3280 | sa.sa_flags = 0; | |
3281 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3282 | perror("sigaction"); | |
3283 | return ret; | |
d6f42150 DG |
3284 | } |
3285 | ||
1d4b027a DG |
3286 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3287 | perror("sigaction"); | |
3288 | return ret; | |
d6f42150 | 3289 | } |
aaf26714 | 3290 | |
1d4b027a DG |
3291 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3292 | perror("sigaction"); | |
3293 | return ret; | |
8c0faa1d DG |
3294 | } |
3295 | ||
1d4b027a DG |
3296 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3297 | ||
3298 | return ret; | |
fac6795d DG |
3299 | } |
3300 | ||
f3ed775e | 3301 | /* |
d063d709 DG |
3302 | * Set open files limit to unlimited. This daemon can open a large number of |
3303 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3304 | */ |
3305 | static void set_ulimit(void) | |
3306 | { | |
3307 | int ret; | |
3308 | struct rlimit lim; | |
3309 | ||
a88df331 | 3310 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3311 | lim.rlim_cur = 65535; |
3312 | lim.rlim_max = 65535; | |
3313 | ||
3314 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3315 | if (ret < 0) { | |
3316 | perror("failed to set open files limit"); | |
3317 | } | |
3318 | } | |
3319 | ||
fac6795d DG |
3320 | /* |
3321 | * main | |
3322 | */ | |
3323 | int main(int argc, char **argv) | |
3324 | { | |
fac6795d DG |
3325 | int ret = 0; |
3326 | void *status; | |
b082db07 | 3327 | const char *home_path; |
fac6795d | 3328 | |
b25a8868 DG |
3329 | tracepoint(sessiond_boot_start); |
3330 | ||
273ea72c | 3331 | /* Create thread quit pipe */ |
cf3af59e MD |
3332 | if ((ret = init_thread_quit_pipe()) < 0) { |
3333 | goto error; | |
273ea72c DG |
3334 | } |
3335 | ||
fac6795d DG |
3336 | /* Parse arguments */ |
3337 | progname = argv[0]; | |
3338 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3339 | goto error; |
fac6795d DG |
3340 | } |
3341 | ||
3342 | /* Daemonize */ | |
3343 | if (opt_daemon) { | |
53094c05 DG |
3344 | ret = daemon(0, 0); |
3345 | if (ret < 0) { | |
3346 | perror("daemon"); | |
cf3af59e | 3347 | goto error; |
53094c05 | 3348 | } |
fac6795d DG |
3349 | } |
3350 | ||
3351 | /* Check if daemon is UID = 0 */ | |
3352 | is_root = !getuid(); | |
3353 | ||
fac6795d | 3354 | if (is_root) { |
d6f42150 DG |
3355 | ret = create_lttng_rundir(); |
3356 | if (ret < 0) { | |
cf3af59e | 3357 | goto error; |
d6f42150 DG |
3358 | } |
3359 | ||
fac6795d | 3360 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3361 | snprintf(apps_unix_sock_path, PATH_MAX, |
3362 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3363 | } |
3364 | ||
3365 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3366 | snprintf(client_unix_sock_path, PATH_MAX, |
3367 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3368 | } | |
0fdd1e2c DG |
3369 | |
3370 | /* Set global SHM for ust */ | |
3371 | if (strlen(wait_shm_path) == 0) { | |
3372 | snprintf(wait_shm_path, PATH_MAX, | |
3373 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3374 | } | |
fac6795d | 3375 | } else { |
b082db07 DG |
3376 | home_path = get_home_dir(); |
3377 | if (home_path == NULL) { | |
273ea72c DG |
3378 | /* TODO: Add --socket PATH option */ |
3379 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3380 | ret = -EPERM; |
3381 | goto error; | |
b082db07 DG |
3382 | } |
3383 | ||
fac6795d | 3384 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3385 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3386 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3387 | } |
3388 | ||
3389 | /* Set the cli tool unix socket path */ | |
3390 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3391 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3392 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3393 | } |
0fdd1e2c DG |
3394 | |
3395 | /* Set global SHM for ust */ | |
3396 | if (strlen(wait_shm_path) == 0) { | |
3397 | snprintf(wait_shm_path, PATH_MAX, | |
3398 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3399 | } | |
fac6795d DG |
3400 | } |
3401 | ||
847177cd DG |
3402 | DBG("Client socket path %s", client_unix_sock_path); |
3403 | DBG("Application socket path %s", apps_unix_sock_path); | |
3404 | ||
273ea72c | 3405 | /* |
7d8234d9 | 3406 | * See if daemon already exist. |
fac6795d | 3407 | */ |
7d8234d9 | 3408 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3409 | ERR("Already running daemon.\n"); |
273ea72c | 3410 | /* |
cf3af59e MD |
3411 | * We do not goto exit because we must not cleanup() |
3412 | * because a daemon is already running. | |
ab118b20 | 3413 | */ |
cf3af59e | 3414 | goto error; |
a88df331 DG |
3415 | } |
3416 | ||
54d01ffb | 3417 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3418 | |
3419 | /* | |
3420 | * These actions must be executed as root. We do that *after* setting up | |
3421 | * the sockets path because we MUST make the check for another daemon using | |
3422 | * those paths *before* trying to set the kernel consumer sockets and init | |
3423 | * kernel tracer. | |
3424 | */ | |
3425 | if (is_root) { | |
3426 | ret = set_kconsumerd_sockets(); | |
3427 | if (ret < 0) { | |
cf3af59e | 3428 | goto exit; |
a88df331 DG |
3429 | } |
3430 | ||
3431 | /* Setup kernel tracer */ | |
3432 | init_kernel_tracer(); | |
3433 | ||
3434 | /* Set ulimit for open files */ | |
3435 | set_ulimit(); | |
fac6795d DG |
3436 | } |
3437 | ||
cf3af59e MD |
3438 | if ((ret = set_signal_handler()) < 0) { |
3439 | goto exit; | |
fac6795d DG |
3440 | } |
3441 | ||
d6f42150 | 3442 | /* Setup the needed unix socket */ |
cf3af59e MD |
3443 | if ((ret = init_daemon_socket()) < 0) { |
3444 | goto exit; | |
fac6795d DG |
3445 | } |
3446 | ||
3447 | /* Set credentials to socket */ | |
cf3af59e MD |
3448 | if (is_root && ((ret = set_permissions()) < 0)) { |
3449 | goto exit; | |
fac6795d DG |
3450 | } |
3451 | ||
5b8719f5 DG |
3452 | /* Get parent pid if -S, --sig-parent is specified. */ |
3453 | if (opt_sig_parent) { | |
3454 | ppid = getppid(); | |
3455 | } | |
3456 | ||
7a485870 | 3457 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3458 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3459 | goto exit; | |
7a485870 DG |
3460 | } |
3461 | ||
099e26bd DG |
3462 | /* Setup the thread apps communication pipe. */ |
3463 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3464 | goto exit; | |
3465 | } | |
3466 | ||
3467 | /* Init UST command queue. */ | |
3468 | cds_wfq_init(&ust_cmd_queue.queue); | |
3469 | ||
273ea72c | 3470 | /* |
54d01ffb DG |
3471 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3472 | * statically declared in session.c | |
273ea72c | 3473 | */ |
54d01ffb | 3474 | session_list_ptr = session_get_list(); |
b5541356 | 3475 | |
5eb91c98 DG |
3476 | /* Set up max poll set size */ |
3477 | lttng_poll_set_max_size(); | |
3478 | ||
cf3af59e | 3479 | /* Create thread to manage the client socket */ |
099e26bd DG |
3480 | ret = pthread_create(&client_thread, NULL, |
3481 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3482 | if (ret != 0) { |
099e26bd | 3483 | perror("pthread_create clients"); |
cf3af59e MD |
3484 | goto exit_client; |
3485 | } | |
fac6795d | 3486 | |
099e26bd DG |
3487 | /* Create thread to dispatch registration */ |
3488 | ret = pthread_create(&dispatch_thread, NULL, | |
3489 | thread_dispatch_ust_registration, (void *) NULL); | |
3490 | if (ret != 0) { | |
3491 | perror("pthread_create dispatch"); | |
3492 | goto exit_dispatch; | |
3493 | } | |
3494 | ||
3495 | /* Create thread to manage application registration. */ | |
3496 | ret = pthread_create(®_apps_thread, NULL, | |
3497 | thread_registration_apps, (void *) NULL); | |
3498 | if (ret != 0) { | |
3499 | perror("pthread_create registration"); | |
3500 | goto exit_reg_apps; | |
3501 | } | |
3502 | ||
cf3af59e | 3503 | /* Create thread to manage application socket */ |
54d01ffb DG |
3504 | ret = pthread_create(&apps_thread, NULL, |
3505 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 3506 | if (ret != 0) { |
099e26bd | 3507 | perror("pthread_create apps"); |
cf3af59e MD |
3508 | goto exit_apps; |
3509 | } | |
fac6795d | 3510 | |
cf3af59e | 3511 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
3512 | ret = pthread_create(&kernel_thread, NULL, |
3513 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 3514 | if (ret != 0) { |
099e26bd | 3515 | perror("pthread_create kernel"); |
cf3af59e MD |
3516 | goto exit_kernel; |
3517 | } | |
7a485870 | 3518 | |
b25a8868 DG |
3519 | tracepoint(sessiond_boot_end); |
3520 | ||
cf3af59e MD |
3521 | ret = pthread_join(kernel_thread, &status); |
3522 | if (ret != 0) { | |
3523 | perror("pthread_join"); | |
3524 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3525 | } |
3526 | ||
cf3af59e MD |
3527 | exit_kernel: |
3528 | ret = pthread_join(apps_thread, &status); | |
3529 | if (ret != 0) { | |
3530 | perror("pthread_join"); | |
3531 | goto error; /* join error, exit without cleanup */ | |
3532 | } | |
fac6795d | 3533 | |
cf3af59e | 3534 | exit_apps: |
099e26bd DG |
3535 | ret = pthread_join(reg_apps_thread, &status); |
3536 | if (ret != 0) { | |
3537 | perror("pthread_join"); | |
3538 | goto error; /* join error, exit without cleanup */ | |
3539 | } | |
3540 | ||
3541 | exit_reg_apps: | |
3542 | ret = pthread_join(dispatch_thread, &status); | |
3543 | if (ret != 0) { | |
3544 | perror("pthread_join"); | |
3545 | goto error; /* join error, exit without cleanup */ | |
3546 | } | |
3547 | ||
3548 | exit_dispatch: | |
cf3af59e MD |
3549 | ret = pthread_join(client_thread, &status); |
3550 | if (ret != 0) { | |
3551 | perror("pthread_join"); | |
3552 | goto error; /* join error, exit without cleanup */ | |
3553 | } | |
3554 | ||
3555 | ret = join_kconsumerd_thread(); | |
3556 | if (ret != 0) { | |
3557 | perror("join_kconsumerd"); | |
3558 | goto error; /* join error, exit without cleanup */ | |
3559 | } | |
a88df331 | 3560 | |
cf3af59e | 3561 | exit_client: |
a88df331 | 3562 | exit: |
cf3af59e MD |
3563 | /* |
3564 | * cleanup() is called when no other thread is running. | |
3565 | */ | |
3566 | cleanup(); | |
3567 | if (!ret) | |
3568 | exit(EXIT_SUCCESS); | |
3569 | error: | |
5e16da05 | 3570 | exit(EXIT_FAILURE); |
fac6795d | 3571 | } |