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 DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
7a485870 | 25 | #include <poll.h> |
fac6795d | 26 | #include <pthread.h> |
8c0faa1d | 27 | #include <semaphore.h> |
fac6795d DG |
28 | #include <signal.h> |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
0fdd1e2c | 32 | #include <sys/mman.h> |
b73401da | 33 | #include <sys/mount.h> |
1e307fab | 34 | #include <sys/resource.h> |
fac6795d DG |
35 | #include <sys/socket.h> |
36 | #include <sys/stat.h> | |
37 | #include <sys/types.h> | |
0fdd1e2c DG |
38 | #include <sys/wait.h> |
39 | #include <urcu/futex.h> | |
fac6795d DG |
40 | #include <unistd.h> |
41 | ||
1e307fab | 42 | #include <ltt-kconsumerd.h> |
e88129fc | 43 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
44 | #include <lttng/lttng-kconsumerd.h> |
45 | #include <lttngerr.h> | |
fac6795d | 46 | |
b579acd9 | 47 | #include "context.h" |
099e26bd | 48 | #include "futex.h" |
20fe2104 | 49 | #include "kernel-ctl.h" |
1e307fab | 50 | #include "ltt-sessiond.h" |
0fdd1e2c | 51 | #include "shm.h" |
91d76f53 | 52 | #include "traceable-app.h" |
1e307fab | 53 | #include "ust-ctl.h" |
8e68d1c8 | 54 | #include "utils.h" |
0177d773 | 55 | #include "ust-ctl.h" |
fac6795d | 56 | |
b25a8868 DG |
57 | #include "benchmark.h" |
58 | ||
75462a81 | 59 | /* Const values */ |
686204ab | 60 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 61 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
62 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
63 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
64 | ||
fac6795d | 65 | /* Variables */ |
1d4b027a | 66 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 67 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 68 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 69 | |
fac6795d DG |
70 | const char *progname; |
71 | const char *opt_tracing_group; | |
5b8719f5 | 72 | static int opt_sig_parent; |
fac6795d DG |
73 | static int opt_daemon; |
74 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
75 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
76 | static pid_t kconsumerd_pid; | |
7a485870 | 77 | static struct pollfd *kernel_pollfd; |
099e26bd | 78 | static int dispatch_thread_exit; |
fac6795d | 79 | |
d6f42150 DG |
80 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
81 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
82 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
83 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
0fdd1e2c | 84 | static char wait_shm_path[PATH_MAX]; /* global wait shm path for UST */ |
fac6795d | 85 | |
1d4b027a | 86 | /* Sockets and FDs */ |
d6f42150 DG |
87 | static int client_sock; |
88 | static int apps_sock; | |
89 | static int kconsumerd_err_sock; | |
8c0faa1d | 90 | static int kconsumerd_cmd_sock; |
20fe2104 | 91 | static int kernel_tracer_fd; |
7a485870 | 92 | static int kernel_poll_pipe[2]; |
1d4b027a | 93 | |
273ea72c DG |
94 | /* |
95 | * Quit pipe for all threads. This permits a single cancellation point | |
96 | * for all threads when receiving an event on the pipe. | |
97 | */ | |
98 | static int thread_quit_pipe[2]; | |
99 | ||
099e26bd DG |
100 | /* |
101 | * This pipe is used to inform the thread managing application communication | |
102 | * that a command is queued and ready to be processed. | |
103 | */ | |
104 | static int apps_cmd_pipe[2]; | |
105 | ||
1d4b027a | 106 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 107 | static pthread_t kconsumerd_thread; |
1d4b027a | 108 | static pthread_t apps_thread; |
099e26bd | 109 | static pthread_t reg_apps_thread; |
1d4b027a | 110 | static pthread_t client_thread; |
7a485870 | 111 | static pthread_t kernel_thread; |
099e26bd | 112 | static pthread_t dispatch_thread; |
8c0faa1d DG |
113 | static sem_t kconsumerd_sem; |
114 | ||
1d4b027a | 115 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 116 | |
099e26bd DG |
117 | /* |
118 | * UST registration command queue. This queue is tied with a futex and uses a N | |
119 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
120 | * | |
121 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
122 | * this queue and the wait/wake scheme. | |
123 | */ | |
124 | static struct ust_cmd_queue ust_cmd_queue; | |
125 | ||
b5541356 DG |
126 | /* |
127 | * Pointer initialized before thread creation. | |
128 | * | |
129 | * This points to the tracing session list containing the session count and a | |
130 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
131 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 132 | * |
d063d709 DG |
133 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
134 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
135 | */ |
136 | static struct ltt_session_list *session_list_ptr; | |
137 | ||
0fdd1e2c DG |
138 | /* |
139 | * Remove modules in reverse load order. | |
140 | */ | |
141 | static int modprobe_remove_kernel_modules(void) | |
142 | { | |
143 | int ret = 0, i; | |
144 | char modprobe[256]; | |
145 | ||
146 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
147 | ret = snprintf(modprobe, sizeof(modprobe), | |
148 | "/sbin/modprobe --remove --quiet %s", | |
149 | kernel_modules_list[i].name); | |
150 | if (ret < 0) { | |
151 | perror("snprintf modprobe --remove"); | |
152 | goto error; | |
153 | } | |
154 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
155 | ret = system(modprobe); | |
156 | if (ret == -1) { | |
157 | ERR("Unable to launch modprobe --remove for module %s", | |
158 | kernel_modules_list[i].name); | |
159 | } else if (kernel_modules_list[i].required | |
160 | && WEXITSTATUS(ret) != 0) { | |
161 | ERR("Unable to remove module %s", | |
162 | kernel_modules_list[i].name); | |
163 | } else { | |
164 | DBG("Modprobe removal successful %s", | |
165 | kernel_modules_list[i].name); | |
166 | } | |
167 | } | |
168 | ||
169 | error: | |
170 | return ret; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Return group ID of the tracing group or -1 if not found. | |
175 | */ | |
996b65c8 MD |
176 | static gid_t allowed_group(void) |
177 | { | |
178 | struct group *grp; | |
179 | ||
274e143b MD |
180 | if (opt_tracing_group) { |
181 | grp = getgrnam(opt_tracing_group); | |
182 | } else { | |
183 | grp = getgrnam(default_tracing_group); | |
184 | } | |
996b65c8 MD |
185 | if (!grp) { |
186 | return -1; | |
187 | } else { | |
188 | return grp->gr_gid; | |
189 | } | |
190 | } | |
191 | ||
273ea72c DG |
192 | /* |
193 | * Init quit pipe. | |
194 | * | |
195 | * Return -1 on error or 0 if all pipes are created. | |
196 | */ | |
197 | static int init_thread_quit_pipe(void) | |
198 | { | |
199 | int ret; | |
200 | ||
201 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
202 | if (ret < 0) { | |
203 | perror("thread quit pipe"); | |
204 | goto error; | |
205 | } | |
206 | ||
207 | error: | |
208 | return ret; | |
209 | } | |
210 | ||
fac6795d | 211 | /* |
d063d709 DG |
212 | * Complete teardown of a kernel session. This free all data structure related |
213 | * to a kernel session and update counter. | |
fac6795d | 214 | */ |
1d4b027a | 215 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 216 | { |
1d4b027a DG |
217 | if (session->kernel_session != NULL) { |
218 | DBG("Tearing down kernel session"); | |
d9800920 DG |
219 | |
220 | /* | |
221 | * If a custom kernel consumer was registered, close the socket before | |
222 | * tearing down the complete kernel session structure | |
223 | */ | |
224 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
225 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
226 | } | |
227 | ||
62499ad6 | 228 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
229 | /* Extra precaution */ |
230 | session->kernel_session = NULL; | |
fac6795d | 231 | } |
fac6795d DG |
232 | } |
233 | ||
099e26bd DG |
234 | /* |
235 | * Stop all threads by closing the thread quit pipe. | |
236 | */ | |
cf3af59e MD |
237 | static void stop_threads(void) |
238 | { | |
239 | /* Stopping all threads */ | |
240 | DBG("Terminating all threads"); | |
241 | close(thread_quit_pipe[0]); | |
242 | close(thread_quit_pipe[1]); | |
099e26bd DG |
243 | /* Dispatch thread */ |
244 | dispatch_thread_exit = 1; | |
245 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
246 | } |
247 | ||
fac6795d | 248 | /* |
d063d709 | 249 | * Cleanup the daemon |
fac6795d | 250 | */ |
cf3af59e | 251 | static void cleanup(void) |
fac6795d | 252 | { |
1d4b027a DG |
253 | int ret; |
254 | char *cmd; | |
af9737e9 | 255 | struct ltt_session *sess, *stmp; |
fac6795d | 256 | |
1d4b027a | 257 | DBG("Cleaning up"); |
e07ae692 | 258 | |
1d4b027a | 259 | /* <fun> */ |
2f50c8a3 | 260 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
261 | "Matthew, BEET driven development works!%c[%dm", |
262 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 263 | /* </fun> */ |
fac6795d | 264 | |
1d4b027a DG |
265 | DBG("Removing %s directory", LTTNG_RUNDIR); |
266 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
267 | if (ret < 0) { | |
268 | ERR("asprintf failed. Something is really wrong!"); | |
269 | } | |
5461b305 | 270 | |
1d4b027a DG |
271 | /* Remove lttng run directory */ |
272 | ret = system(cmd); | |
273 | if (ret < 0) { | |
274 | ERR("Unable to clean " LTTNG_RUNDIR); | |
275 | } | |
5461b305 | 276 | |
1d4b027a | 277 | DBG("Cleaning up all session"); |
fac6795d | 278 | |
b5541356 | 279 | /* Destroy session list mutex */ |
273ea72c DG |
280 | if (session_list_ptr != NULL) { |
281 | pthread_mutex_destroy(&session_list_ptr->lock); | |
282 | ||
283 | /* Cleanup ALL session */ | |
af9737e9 | 284 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
285 | teardown_kernel_session(sess); |
286 | // TODO complete session cleanup (including UST) | |
287 | } | |
288 | } | |
289 | ||
099e26bd DG |
290 | DBG("Closing all UST sockets"); |
291 | clean_traceable_apps_list(); | |
292 | ||
273ea72c | 293 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 294 | |
f3ed775e | 295 | DBG("Closing kernel fd"); |
1d4b027a | 296 | close(kernel_tracer_fd); |
ab147185 | 297 | |
2f50c8a3 DG |
298 | if (is_root) { |
299 | DBG("Unloading kernel modules"); | |
300 | modprobe_remove_kernel_modules(); | |
301 | } | |
b25a8868 | 302 | |
3c6bae61 DG |
303 | /* OUTPUT BENCHMARK RESULTS */ |
304 | bench_init(); | |
305 | ||
62d53818 DG |
306 | if (getenv("BENCH_UST_NOTIFY")) { |
307 | bench_print_ust_notification(); | |
308 | } | |
309 | ||
310 | if (getenv("BENCH_UST_REGISTER")) { | |
311 | bench_print_ust_register(); | |
312 | } | |
313 | ||
314 | if (getenv("BENCH_BOOT_PROCESS")) { | |
315 | bench_print_boot_process(); | |
316 | } | |
3c6bae61 DG |
317 | |
318 | bench_close(); | |
319 | /* END BENCHMARK */ | |
fac6795d DG |
320 | } |
321 | ||
e065084a | 322 | /* |
d063d709 | 323 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 324 | * |
d063d709 | 325 | * Return lttcomm error code. |
e065084a DG |
326 | */ |
327 | static int send_unix_sock(int sock, void *buf, size_t len) | |
328 | { | |
329 | /* Check valid length */ | |
330 | if (len <= 0) { | |
331 | return -1; | |
332 | } | |
333 | ||
334 | return lttcomm_send_unix_sock(sock, buf, len); | |
335 | } | |
336 | ||
5461b305 | 337 | /* |
d063d709 | 338 | * Free memory of a command context structure. |
5461b305 | 339 | */ |
a2fb29a5 | 340 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 341 | { |
a2fb29a5 DG |
342 | DBG("Clean command context structure"); |
343 | if (*cmd_ctx) { | |
344 | if ((*cmd_ctx)->llm) { | |
345 | free((*cmd_ctx)->llm); | |
5461b305 | 346 | } |
a2fb29a5 DG |
347 | if ((*cmd_ctx)->lsm) { |
348 | free((*cmd_ctx)->lsm); | |
5461b305 | 349 | } |
a2fb29a5 DG |
350 | free(*cmd_ctx); |
351 | *cmd_ctx = NULL; | |
5461b305 DG |
352 | } |
353 | } | |
354 | ||
f3ed775e | 355 | /* |
d063d709 | 356 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 357 | */ |
7a485870 | 358 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
359 | { |
360 | int ret; | |
361 | size_t nb_fd; | |
362 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
363 | struct lttcomm_kconsumerd_header lkh; |
364 | struct lttcomm_kconsumerd_msg lkm; | |
365 | ||
7a485870 DG |
366 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
367 | ||
368 | nb_fd = channel->stream_count; | |
f3ed775e DG |
369 | |
370 | /* Setup header */ | |
7a485870 | 371 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
372 | lkh.cmd_type = ADD_STREAM; |
373 | ||
374 | DBG("Sending kconsumerd header"); | |
375 | ||
376 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
377 | if (ret < 0) { | |
378 | perror("send kconsumerd header"); | |
379 | goto error; | |
380 | } | |
381 | ||
7a485870 DG |
382 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
383 | if (stream->fd != 0) { | |
f3ed775e DG |
384 | lkm.fd = stream->fd; |
385 | lkm.state = stream->state; | |
7a485870 | 386 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 387 | lkm.output = channel->channel->attr.output; |
f3ed775e | 388 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 389 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
390 | |
391 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
392 | ||
393 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
394 | if (ret < 0) { | |
395 | perror("send kconsumerd fd"); | |
396 | goto error; | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
7a485870 | 401 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
402 | |
403 | return 0; | |
404 | ||
405 | error: | |
406 | return ret; | |
407 | } | |
408 | ||
409 | /* | |
d063d709 | 410 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 411 | */ |
d9800920 | 412 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
413 | { |
414 | int ret; | |
415 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
416 | struct lttcomm_kconsumerd_header lkh; |
417 | struct lttcomm_kconsumerd_msg lkm; | |
418 | ||
419 | /* Setup header */ | |
420 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
421 | lkh.cmd_type = ADD_STREAM; | |
422 | ||
423 | DBG("Sending kconsumerd header for metadata"); | |
424 | ||
d9800920 | 425 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
426 | if (ret < 0) { |
427 | perror("send kconsumerd header"); | |
428 | goto error; | |
429 | } | |
430 | ||
431 | DBG("Sending metadata stream fd"); | |
432 | ||
d9800920 DG |
433 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
434 | if (session->consumer_fd == 0) { | |
435 | session->consumer_fd = kconsumerd_cmd_sock; | |
436 | } | |
437 | ||
7a485870 DG |
438 | if (session->metadata_stream_fd != 0) { |
439 | /* Send metadata stream fd first */ | |
440 | lkm.fd = session->metadata_stream_fd; | |
441 | lkm.state = ACTIVE_FD; | |
442 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 443 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 444 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 445 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 446 | |
d9800920 | 447 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
448 | if (ret < 0) { |
449 | perror("send kconsumerd fd"); | |
450 | goto error; | |
451 | } | |
452 | } | |
f3ed775e | 453 | |
f3ed775e | 454 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 455 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 456 | if (ret < 0) { |
7a485870 | 457 | goto error; |
f3ed775e DG |
458 | } |
459 | } | |
460 | ||
7a485870 DG |
461 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
462 | ||
f3ed775e DG |
463 | return 0; |
464 | ||
465 | error: | |
466 | return ret; | |
467 | } | |
468 | ||
fac6795d | 469 | /* |
0fdd1e2c | 470 | * Notify UST applications using the shm mmap futex. |
fac6795d | 471 | */ |
0fdd1e2c | 472 | static int notify_ust_apps(int active) |
fac6795d | 473 | { |
0fdd1e2c | 474 | char *wait_shm_mmap; |
fac6795d | 475 | |
0fdd1e2c | 476 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 477 | |
62d53818 DG |
478 | tracepoint(ust_notify_apps_start); |
479 | ||
0fdd1e2c DG |
480 | /* See shm.c for this call implying mmap, shm and futex calls */ |
481 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
482 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
483 | goto error; |
484 | } | |
485 | ||
0fdd1e2c DG |
486 | /* Wake waiting process */ |
487 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
488 | ||
62d53818 DG |
489 | tracepoint(ust_notify_apps_stop); |
490 | ||
0fdd1e2c DG |
491 | /* Apps notified successfully */ |
492 | return 0; | |
fac6795d DG |
493 | |
494 | error: | |
0fdd1e2c | 495 | return -1; |
fac6795d DG |
496 | } |
497 | ||
e065084a | 498 | /* |
d063d709 DG |
499 | * Setup the outgoing data buffer for the response (llm) by allocating the |
500 | * right amount of memory and copying the original information from the lsm | |
501 | * structure. | |
ca95a216 | 502 | * |
d063d709 | 503 | * Return total size of the buffer pointed by buf. |
ca95a216 | 504 | */ |
5461b305 | 505 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 506 | { |
f3ed775e | 507 | int ret, buf_size; |
ca95a216 | 508 | |
f3ed775e | 509 | buf_size = size; |
5461b305 DG |
510 | |
511 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
512 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 513 | perror("malloc"); |
5461b305 | 514 | ret = -ENOMEM; |
ca95a216 DG |
515 | goto error; |
516 | } | |
517 | ||
5461b305 DG |
518 | /* Copy common data */ |
519 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 520 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 521 | |
5461b305 DG |
522 | cmd_ctx->llm->data_size = size; |
523 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
524 | ||
ca95a216 DG |
525 | return buf_size; |
526 | ||
527 | error: | |
528 | return ret; | |
529 | } | |
530 | ||
7a485870 | 531 | /* |
d063d709 DG |
532 | * Update the kernel pollfd set of all channel fd available over all tracing |
533 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
534 | */ |
535 | static int update_kernel_pollfd(void) | |
536 | { | |
537 | int i = 0; | |
273ea72c DG |
538 | /* |
539 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
540 | * at 2 for those pipes. | |
541 | */ | |
542 | unsigned int nb_fd = 2; | |
7a485870 DG |
543 | struct ltt_session *session; |
544 | struct ltt_kernel_channel *channel; | |
545 | ||
546 | DBG("Updating kernel_pollfd"); | |
547 | ||
548 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 549 | lock_session_list(); |
b5541356 DG |
550 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
551 | lock_session(session); | |
7a485870 | 552 | if (session->kernel_session == NULL) { |
b5541356 | 553 | unlock_session(session); |
7a485870 DG |
554 | continue; |
555 | } | |
556 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 557 | unlock_session(session); |
7a485870 DG |
558 | } |
559 | ||
560 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
561 | ||
562 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
563 | if (kernel_pollfd == NULL) { | |
564 | perror("malloc kernel_pollfd"); | |
565 | goto error; | |
566 | } | |
567 | ||
b5541356 DG |
568 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
569 | lock_session(session); | |
7a485870 | 570 | if (session->kernel_session == NULL) { |
b5541356 | 571 | unlock_session(session); |
7a485870 DG |
572 | continue; |
573 | } | |
574 | if (i >= nb_fd) { | |
575 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 576 | unlock_session(session); |
7a485870 DG |
577 | break; |
578 | } | |
579 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
580 | kernel_pollfd[i].fd = channel->fd; | |
581 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
582 | i++; | |
583 | } | |
b5541356 | 584 | unlock_session(session); |
7a485870 | 585 | } |
6c9cc2ab | 586 | unlock_session_list(); |
7a485870 DG |
587 | |
588 | /* Adding wake up pipe */ | |
273ea72c DG |
589 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
590 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
591 | ||
592 | /* Adding the quit pipe */ | |
593 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
594 | |
595 | return nb_fd; | |
596 | ||
597 | error: | |
6c9cc2ab | 598 | unlock_session_list(); |
7a485870 DG |
599 | return -1; |
600 | } | |
601 | ||
602 | /* | |
d063d709 DG |
603 | * Find the channel fd from 'fd' over all tracing session. When found, check |
604 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 605 | * |
d063d709 | 606 | * Useful for CPU hotplug feature. |
7a485870 DG |
607 | */ |
608 | static int update_kernel_stream(int fd) | |
609 | { | |
610 | int ret = 0; | |
611 | struct ltt_session *session; | |
612 | struct ltt_kernel_channel *channel; | |
613 | ||
614 | DBG("Updating kernel streams for channel fd %d", fd); | |
615 | ||
6c9cc2ab | 616 | lock_session_list(); |
b5541356 DG |
617 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
618 | lock_session(session); | |
7a485870 | 619 | if (session->kernel_session == NULL) { |
b5541356 | 620 | unlock_session(session); |
7a485870 DG |
621 | continue; |
622 | } | |
d9800920 DG |
623 | |
624 | /* This is not suppose to be 0 but this is an extra security check */ | |
625 | if (session->kernel_session->consumer_fd == 0) { | |
626 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
627 | } | |
628 | ||
7a485870 DG |
629 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
630 | if (channel->fd == fd) { | |
631 | DBG("Channel found, updating kernel streams"); | |
632 | ret = kernel_open_channel_stream(channel); | |
633 | if (ret < 0) { | |
634 | goto end; | |
635 | } | |
d9800920 | 636 | |
7a485870 DG |
637 | /* |
638 | * Have we already sent fds to the consumer? If yes, it means that | |
639 | * tracing is started so it is safe to send our updated stream fds. | |
640 | */ | |
641 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
642 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
643 | channel); | |
7a485870 DG |
644 | if (ret < 0) { |
645 | goto end; | |
646 | } | |
647 | } | |
648 | goto end; | |
649 | } | |
650 | } | |
b5541356 | 651 | unlock_session(session); |
7a485870 DG |
652 | } |
653 | ||
654 | end: | |
6c9cc2ab | 655 | unlock_session_list(); |
b5541356 DG |
656 | if (session) { |
657 | unlock_session(session); | |
658 | } | |
7a485870 DG |
659 | return ret; |
660 | } | |
661 | ||
662 | /* | |
d063d709 | 663 | * This thread manage event coming from the kernel. |
7a485870 | 664 | * |
d063d709 DG |
665 | * Features supported in this thread: |
666 | * -) CPU Hotplug | |
7a485870 DG |
667 | */ |
668 | static void *thread_manage_kernel(void *data) | |
669 | { | |
670 | int ret, i, nb_fd = 0; | |
671 | char tmp; | |
672 | int update_poll_flag = 1; | |
673 | ||
b25a8868 DG |
674 | tracepoint(sessiond_th_kern_start); |
675 | ||
7a485870 DG |
676 | DBG("Thread manage kernel started"); |
677 | ||
678 | while (1) { | |
679 | if (update_poll_flag == 1) { | |
680 | nb_fd = update_kernel_pollfd(); | |
681 | if (nb_fd < 0) { | |
682 | goto error; | |
683 | } | |
684 | update_poll_flag = 0; | |
685 | } | |
686 | ||
687 | DBG("Polling on %d fds", nb_fd); | |
688 | ||
b25a8868 DG |
689 | tracepoint(sessiond_th_kern_poll); |
690 | ||
7a485870 DG |
691 | /* Poll infinite value of time */ |
692 | ret = poll(kernel_pollfd, nb_fd, -1); | |
693 | if (ret < 0) { | |
694 | perror("poll kernel thread"); | |
695 | goto error; | |
696 | } else if (ret == 0) { | |
697 | /* Should not happen since timeout is infinite */ | |
698 | continue; | |
699 | } | |
700 | ||
273ea72c DG |
701 | /* Thread quit pipe has been closed. Killing thread. */ |
702 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
703 | goto error; | |
704 | } | |
705 | ||
7a485870 DG |
706 | DBG("Kernel poll event triggered"); |
707 | ||
708 | /* | |
709 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
710 | * must be updated. | |
711 | */ | |
273ea72c | 712 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 713 | case POLLIN: |
7a485870 DG |
714 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
715 | update_poll_flag = 1; | |
716 | continue; | |
b5541356 DG |
717 | case POLLERR: |
718 | goto error; | |
719 | default: | |
720 | break; | |
7a485870 DG |
721 | } |
722 | ||
723 | for (i = 0; i < nb_fd; i++) { | |
724 | switch (kernel_pollfd[i].revents) { | |
725 | /* | |
726 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
727 | * session and updating the kernel consumer | |
728 | */ | |
729 | case POLLIN | POLLRDNORM: | |
730 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
731 | if (ret < 0) { | |
732 | continue; | |
733 | } | |
734 | break; | |
735 | } | |
736 | } | |
737 | } | |
738 | ||
739 | error: | |
740 | DBG("Kernel thread dying"); | |
741 | if (kernel_pollfd) { | |
742 | free(kernel_pollfd); | |
743 | } | |
273ea72c DG |
744 | |
745 | close(kernel_poll_pipe[0]); | |
746 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
747 | return NULL; |
748 | } | |
749 | ||
1d4b027a | 750 | /* |
d063d709 | 751 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
752 | */ |
753 | static void *thread_manage_kconsumerd(void *data) | |
754 | { | |
273ea72c | 755 | int sock = 0, ret; |
1d4b027a | 756 | enum lttcomm_return_code code; |
273ea72c | 757 | struct pollfd pollfd[2]; |
1d4b027a | 758 | |
b25a8868 DG |
759 | tracepoint(sessiond_th_kcon_start); |
760 | ||
1d4b027a DG |
761 | DBG("[thread] Manage kconsumerd started"); |
762 | ||
763 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
764 | if (ret < 0) { | |
765 | goto error; | |
766 | } | |
767 | ||
273ea72c DG |
768 | /* First fd is always the quit pipe */ |
769 | pollfd[0].fd = thread_quit_pipe[0]; | |
770 | ||
771 | /* Apps socket */ | |
772 | pollfd[1].fd = kconsumerd_err_sock; | |
773 | pollfd[1].events = POLLIN; | |
774 | ||
b25a8868 DG |
775 | tracepoint(sessiond_th_kcon_poll); |
776 | ||
273ea72c DG |
777 | /* Inifinite blocking call, waiting for transmission */ |
778 | ret = poll(pollfd, 2, -1); | |
779 | if (ret < 0) { | |
780 | perror("poll kconsumerd thread"); | |
781 | goto error; | |
782 | } | |
783 | ||
784 | /* Thread quit pipe has been closed. Killing thread. */ | |
785 | if (pollfd[0].revents == POLLNVAL) { | |
786 | goto error; | |
787 | } else if (pollfd[1].revents == POLLERR) { | |
788 | ERR("Kconsumerd err socket poll error"); | |
789 | goto error; | |
790 | } | |
791 | ||
1d4b027a DG |
792 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
793 | if (sock < 0) { | |
794 | goto error; | |
795 | } | |
796 | ||
712ea556 | 797 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
798 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
799 | if (ret <= 0) { | |
800 | goto error; | |
801 | } | |
802 | ||
803 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
804 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
805 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 806 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
807 | perror("kconsumerd connect"); |
808 | goto error; | |
809 | } | |
810 | /* Signal condition to tell that the kconsumerd is ready */ | |
811 | sem_post(&kconsumerd_sem); | |
812 | DBG("Kconsumerd command socket ready"); | |
813 | } else { | |
6f61d021 | 814 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
815 | lttcomm_get_readable_code(-code)); |
816 | goto error; | |
817 | } | |
818 | ||
72079cae DG |
819 | /* Kconsumerd err socket */ |
820 | pollfd[1].fd = sock; | |
821 | pollfd[1].events = POLLIN; | |
822 | ||
823 | /* Inifinite blocking call, waiting for transmission */ | |
824 | ret = poll(pollfd, 2, -1); | |
825 | if (ret < 0) { | |
826 | perror("poll kconsumerd thread"); | |
827 | goto error; | |
828 | } | |
829 | ||
830 | /* Thread quit pipe has been closed. Killing thread. */ | |
831 | if (pollfd[0].revents == POLLNVAL) { | |
832 | goto error; | |
833 | } else if (pollfd[1].revents == POLLERR) { | |
834 | ERR("Kconsumerd err socket second poll error"); | |
835 | goto error; | |
836 | } | |
837 | ||
712ea556 DG |
838 | /* Wait for any kconsumerd error */ |
839 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
840 | if (ret <= 0) { | |
841 | ERR("Kconsumerd closed the command socket"); | |
842 | goto error; | |
6f61d021 | 843 | } |
1d4b027a | 844 | |
712ea556 DG |
845 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
846 | ||
1d4b027a | 847 | error: |
6f61d021 | 848 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
849 | if (kconsumerd_err_sock) { |
850 | close(kconsumerd_err_sock); | |
851 | } | |
852 | if (kconsumerd_cmd_sock) { | |
853 | close(kconsumerd_cmd_sock); | |
854 | } | |
855 | if (sock) { | |
856 | close(sock); | |
857 | } | |
858 | ||
859 | unlink(kconsumerd_err_unix_sock_path); | |
860 | unlink(kconsumerd_cmd_unix_sock_path); | |
861 | ||
862 | kconsumerd_pid = 0; | |
1d4b027a DG |
863 | return NULL; |
864 | } | |
865 | ||
866 | /* | |
099e26bd DG |
867 | * Reallocate the apps command pollfd structure of nb_fd size. |
868 | * | |
869 | * The first two fds must be there at all time. | |
870 | */ | |
0177d773 DG |
871 | static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd, |
872 | struct pollfd **pollfd) | |
099e26bd | 873 | { |
0177d773 DG |
874 | int i, count; |
875 | struct pollfd *old_pollfd = NULL; | |
876 | ||
099e26bd DG |
877 | /* Can't accept pollfd less than 2 */ |
878 | if (nb_fd < 2) { | |
879 | goto end; | |
880 | } | |
881 | ||
0177d773 DG |
882 | if (*pollfd) { |
883 | /* Save pointer */ | |
884 | old_pollfd = *pollfd; | |
885 | } | |
886 | ||
887 | *pollfd = malloc(nb_fd * sizeof(struct pollfd)); | |
099e26bd | 888 | if (*pollfd == NULL) { |
0177d773 | 889 | perror("malloc manage apps pollfd"); |
099e26bd DG |
890 | goto error; |
891 | } | |
892 | ||
893 | /* First fd is always the quit pipe */ | |
894 | (*pollfd)[0].fd = thread_quit_pipe[0]; | |
895 | /* Apps command pipe */ | |
896 | (*pollfd)[1].fd = apps_cmd_pipe[0]; | |
897 | (*pollfd)[1].events = POLLIN; | |
898 | ||
0177d773 DG |
899 | /* Start count after the two pipes below */ |
900 | count = 2; | |
901 | for (i = 2; i < old_nb_fd; i++) { | |
902 | /* Add to new pollfd */ | |
903 | if (old_pollfd[i].fd != -1) { | |
904 | (*pollfd)[count].fd = old_pollfd[i].fd; | |
905 | (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR; | |
906 | count++; | |
907 | } | |
908 | ||
909 | if (count > nb_fd) { | |
910 | ERR("Updating poll fd wrong size"); | |
911 | goto error; | |
912 | } | |
913 | } | |
914 | ||
915 | /* Destroy old pollfd */ | |
916 | free(old_pollfd); | |
917 | ||
099e26bd DG |
918 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); |
919 | ||
920 | end: | |
921 | return 0; | |
922 | ||
923 | error: | |
0177d773 DG |
924 | /* Destroy old pollfd */ |
925 | free(old_pollfd); | |
099e26bd DG |
926 | return -1; |
927 | } | |
928 | ||
099e26bd DG |
929 | /* |
930 | * This thread manage application communication. | |
1d4b027a DG |
931 | */ |
932 | static void *thread_manage_apps(void *data) | |
099e26bd | 933 | { |
28ba3f4e | 934 | int i, ret, current_nb_fd; |
099e26bd DG |
935 | unsigned int nb_fd = 2; |
936 | int update_poll_flag = 1; | |
937 | struct pollfd *pollfd = NULL; | |
938 | struct ust_command ust_cmd; | |
939 | ||
85c434ee DG |
940 | tracepoint(sessiond_th_apps_start); |
941 | ||
099e26bd DG |
942 | DBG("[thread] Manage application started"); |
943 | ||
944 | ust_cmd.sock = -1; | |
28ba3f4e | 945 | current_nb_fd = nb_fd; |
099e26bd DG |
946 | |
947 | while (1) { | |
948 | /* See if we have a valid socket to add to pollfd */ | |
949 | if (ust_cmd.sock != -1) { | |
950 | nb_fd++; | |
951 | update_poll_flag = 1; | |
952 | } | |
953 | ||
954 | /* The pollfd struct must be updated */ | |
955 | if (update_poll_flag) { | |
28ba3f4e | 956 | ret = update_apps_cmd_pollfd(nb_fd, current_nb_fd, &pollfd); |
099e26bd DG |
957 | if (ret < 0) { |
958 | /* malloc failed so we quit */ | |
959 | goto error; | |
960 | } | |
0177d773 | 961 | |
099e26bd DG |
962 | if (ust_cmd.sock != -1) { |
963 | /* Update pollfd with the new UST socket */ | |
964 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); | |
965 | pollfd[nb_fd - 1].fd = ust_cmd.sock; | |
0177d773 | 966 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR; |
099e26bd DG |
967 | ust_cmd.sock = -1; |
968 | } | |
969 | } | |
970 | ||
971 | DBG("Apps thread polling on %d fds", nb_fd); | |
972 | ||
85c434ee DG |
973 | tracepoint(sessiond_th_apps_poll); |
974 | ||
099e26bd DG |
975 | /* Inifinite blocking call, waiting for transmission */ |
976 | ret = poll(pollfd, nb_fd, -1); | |
977 | if (ret < 0) { | |
978 | perror("poll apps thread"); | |
979 | goto error; | |
980 | } | |
981 | ||
982 | /* Thread quit pipe has been closed. Killing thread. */ | |
983 | if (pollfd[0].revents == POLLNVAL) { | |
984 | goto error; | |
0177d773 DG |
985 | } else { |
986 | /* apps_cmd_pipe pipe events */ | |
987 | switch (pollfd[1].revents) { | |
988 | case POLLERR: | |
989 | ERR("Apps command pipe poll error"); | |
099e26bd | 990 | goto error; |
0177d773 | 991 | case POLLIN: |
85c434ee | 992 | tracepoint(ust_register_read_start); |
62d53818 | 993 | |
0177d773 DG |
994 | /* Empty pipe */ |
995 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
996 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
997 | perror("read apps cmd pipe"); | |
998 | goto error; | |
999 | } | |
099e26bd | 1000 | |
85c434ee DG |
1001 | tracepoint(ust_register_read_stop); |
1002 | ||
1003 | tracepoint(ust_register_add_start); | |
0177d773 DG |
1004 | /* Register applicaton to the session daemon */ |
1005 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
1006 | if (ret < 0) { | |
1007 | /* Only critical ENOMEM error can be returned here */ | |
1008 | goto error; | |
1009 | } | |
85c434ee | 1010 | tracepoint(ust_register_add_stop); |
099e26bd | 1011 | |
85c434ee | 1012 | tracepoint(ust_register_done_start); |
0177d773 DG |
1013 | ret = ustctl_register_done(ust_cmd.sock); |
1014 | if (ret < 0) { | |
1015 | /* | |
1016 | * If the registration is not possible, we simply unregister | |
1017 | * the apps and continue | |
1018 | */ | |
1019 | unregister_traceable_app(ust_cmd.sock); | |
1020 | } | |
62d53818 | 1021 | |
85c434ee | 1022 | tracepoint(ust_register_done_stop); |
0177d773 | 1023 | break; |
099e26bd DG |
1024 | } |
1025 | } | |
1026 | ||
28ba3f4e DG |
1027 | current_nb_fd = nb_fd; |
1028 | for (i = 2; i < current_nb_fd; i++) { | |
099e26bd DG |
1029 | /* Apps socket is closed/hungup */ |
1030 | switch (pollfd[i].revents) { | |
0177d773 | 1031 | case POLLERR: |
099e26bd | 1032 | case POLLHUP: |
0177d773 | 1033 | case POLLNVAL: |
099e26bd DG |
1034 | /* Pipe closed */ |
1035 | unregister_traceable_app(pollfd[i].fd); | |
0177d773 DG |
1036 | /* Indicate to remove this fd from the pollfd */ |
1037 | pollfd[i].fd = -1; | |
099e26bd | 1038 | nb_fd--; |
0177d773 | 1039 | break; |
099e26bd DG |
1040 | } |
1041 | } | |
1042 | ||
28ba3f4e | 1043 | if (nb_fd != current_nb_fd) { |
099e26bd DG |
1044 | update_poll_flag = 1; |
1045 | } | |
1046 | } | |
1047 | ||
1048 | error: | |
1049 | DBG("Application communication apps dying"); | |
1050 | close(apps_cmd_pipe[0]); | |
1051 | close(apps_cmd_pipe[1]); | |
1052 | ||
1053 | free(pollfd); | |
1054 | ||
1055 | return NULL; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Dispatch request from the registration threads to the application | |
1060 | * communication thread. | |
1061 | */ | |
1062 | static void *thread_dispatch_ust_registration(void *data) | |
1063 | { | |
1064 | int ret; | |
1065 | struct cds_wfq_node *node; | |
1066 | struct ust_command *ust_cmd = NULL; | |
1067 | ||
85c434ee DG |
1068 | tracepoint(sessiond_th_dispatch_start); |
1069 | ||
099e26bd DG |
1070 | DBG("[thread] Dispatch UST command started"); |
1071 | ||
1072 | while (!dispatch_thread_exit) { | |
1073 | /* Atomically prepare the queue futex */ | |
1074 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1075 | ||
1076 | do { | |
85c434ee DG |
1077 | tracepoint(sessiond_th_dispatch_block); |
1078 | ||
099e26bd DG |
1079 | /* Dequeue command for registration */ |
1080 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1081 | if (node == NULL) { | |
1082 | DBG("Waked up but nothing in the UST command queue"); | |
1083 | /* Continue thread execution */ | |
1084 | break; | |
1085 | } | |
1086 | ||
62d53818 DG |
1087 | tracepoint(ust_dispatch_register_start); |
1088 | ||
099e26bd DG |
1089 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1090 | ||
2f50c8a3 DG |
1091 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1092 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1093 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1094 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1095 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1096 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1097 | /* |
1098 | * Inform apps thread of the new application registration. This | |
1099 | * call is blocking so we can be assured that the data will be read | |
1100 | * at some point in time or wait to the end of the world :) | |
1101 | */ | |
1102 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1103 | sizeof(struct ust_command)); | |
1104 | if (ret < 0) { | |
1105 | perror("write apps cmd pipe"); | |
1106 | if (errno == EBADF) { | |
1107 | /* | |
1108 | * We can't inform the application thread to process | |
1109 | * registration. We will exit or else application | |
1110 | * registration will not occur and tracing will never | |
1111 | * start. | |
1112 | */ | |
1113 | goto error; | |
1114 | } | |
1115 | } | |
1116 | free(ust_cmd); | |
1117 | } while (node != NULL); | |
1118 | ||
62d53818 DG |
1119 | tracepoint(ust_dispatch_register_stop); |
1120 | ||
099e26bd DG |
1121 | /* Futex wait on queue. Blocking call on futex() */ |
1122 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1123 | } | |
1124 | ||
1125 | error: | |
1126 | DBG("Dispatch thread dying"); | |
1127 | return NULL; | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * This thread manage application registration. | |
1132 | */ | |
1133 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1134 | { |
273ea72c DG |
1135 | int sock = 0, ret; |
1136 | struct pollfd pollfd[2]; | |
099e26bd DG |
1137 | /* |
1138 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1139 | * freed in the manage apps thread. | |
1140 | */ | |
1141 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1142 | |
62d53818 | 1143 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1144 | |
099e26bd | 1145 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1146 | |
1147 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1148 | if (ret < 0) { | |
1149 | goto error; | |
1150 | } | |
1151 | ||
273ea72c DG |
1152 | /* First fd is always the quit pipe */ |
1153 | pollfd[0].fd = thread_quit_pipe[0]; | |
1154 | ||
1155 | /* Apps socket */ | |
1156 | pollfd[1].fd = apps_sock; | |
1157 | pollfd[1].events = POLLIN; | |
1158 | ||
1d4b027a | 1159 | /* Notify all applications to register */ |
0fdd1e2c DG |
1160 | ret = notify_ust_apps(1); |
1161 | if (ret < 0) { | |
1162 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
1163 | "Execution continues but there might be problem for already running\n" | |
1164 | "applications that wishes to register."); | |
1165 | } | |
1d4b027a DG |
1166 | |
1167 | while (1) { | |
1168 | DBG("Accepting application registration"); | |
273ea72c | 1169 | |
62d53818 | 1170 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1171 | |
273ea72c DG |
1172 | /* Inifinite blocking call, waiting for transmission */ |
1173 | ret = poll(pollfd, 2, -1); | |
1174 | if (ret < 0) { | |
099e26bd | 1175 | perror("poll register apps thread"); |
273ea72c DG |
1176 | goto error; |
1177 | } | |
1178 | ||
1179 | /* Thread quit pipe has been closed. Killing thread. */ | |
1180 | if (pollfd[0].revents == POLLNVAL) { | |
1181 | goto error; | |
1182 | } else if (pollfd[1].revents == POLLERR) { | |
099e26bd | 1183 | ERR("Register apps socket poll error"); |
273ea72c DG |
1184 | goto error; |
1185 | } | |
1186 | ||
62d53818 DG |
1187 | /* Registration starts here. Recording cycles */ |
1188 | tracepoint(ust_register_start); | |
1189 | ||
1d4b027a DG |
1190 | sock = lttcomm_accept_unix_sock(apps_sock); |
1191 | if (sock < 0) { | |
1192 | goto error; | |
1193 | } | |
1194 | ||
099e26bd DG |
1195 | /* Create UST registration command for enqueuing */ |
1196 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1197 | if (ust_cmd == NULL) { | |
1198 | perror("ust command malloc"); | |
1199 | goto error; | |
1200 | } | |
1201 | ||
273ea72c | 1202 | /* |
099e26bd DG |
1203 | * Using message-based transmissions to ensure we don't have to deal |
1204 | * with partially received messages. | |
1d4b027a | 1205 | */ |
099e26bd DG |
1206 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1207 | sizeof(struct ust_register_msg)); | |
2f50c8a3 DG |
1208 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
1209 | if (ret < 0) { | |
1210 | perror("lttcomm_recv_unix_sock register apps"); | |
1211 | } else { | |
1212 | ERR("Wrong size received on apps register"); | |
1213 | } | |
099e26bd DG |
1214 | free(ust_cmd); |
1215 | close(sock); | |
1d4b027a DG |
1216 | continue; |
1217 | } | |
1218 | ||
099e26bd DG |
1219 | ust_cmd->sock = sock; |
1220 | ||
2f50c8a3 DG |
1221 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1222 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1223 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1224 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1225 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1226 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1227 | /* |
1228 | * Lock free enqueue the registration request. | |
1229 | * The red pill has been taken! This apps will be part of the *system* | |
1230 | */ | |
1231 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1232 | ||
1233 | /* | |
1234 | * Wake the registration queue futex. | |
1235 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. | |
1236 | */ | |
1237 | futex_nto1_wake(&ust_cmd_queue.futex); | |
62d53818 DG |
1238 | |
1239 | tracepoint(ust_register_stop); | |
1d4b027a DG |
1240 | } |
1241 | ||
1242 | error: | |
0fdd1e2c DG |
1243 | DBG("UST Registration thread dying"); |
1244 | ||
1245 | /* Notify that the registration thread is gone */ | |
1246 | notify_ust_apps(0); | |
1247 | ||
1248 | close(apps_sock); | |
1249 | close(sock); | |
1d4b027a | 1250 | |
273ea72c | 1251 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1252 | |
1d4b027a DG |
1253 | return NULL; |
1254 | } | |
1255 | ||
8c0faa1d | 1256 | /* |
d063d709 DG |
1257 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1258 | * exec or it will fails. | |
8c0faa1d | 1259 | */ |
693bd40b | 1260 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1261 | { |
1262 | int ret; | |
1263 | ||
1264 | /* Setup semaphore */ | |
1265 | sem_init(&kconsumerd_sem, 0, 0); | |
1266 | ||
1d4b027a | 1267 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1268 | if (ret != 0) { |
1269 | perror("pthread_create kconsumerd"); | |
1270 | goto error; | |
1271 | } | |
1272 | ||
693bd40b | 1273 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1274 | sem_wait(&kconsumerd_sem); |
1275 | ||
712ea556 DG |
1276 | if (kconsumerd_pid == 0) { |
1277 | ERR("Kconsumerd did not start"); | |
1278 | goto error; | |
1279 | } | |
1280 | ||
8c0faa1d DG |
1281 | return 0; |
1282 | ||
1283 | error: | |
712ea556 | 1284 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1285 | return ret; |
1286 | } | |
1287 | ||
d9800920 DG |
1288 | /* |
1289 | * Join kernel consumer thread | |
1290 | */ | |
cf3af59e MD |
1291 | static int join_kconsumerd_thread(void) |
1292 | { | |
1293 | void *status; | |
1294 | int ret; | |
1295 | ||
1296 | if (kconsumerd_pid != 0) { | |
1297 | ret = kill(kconsumerd_pid, SIGTERM); | |
1298 | if (ret) { | |
1299 | ERR("Error killing kconsumerd"); | |
1300 | return ret; | |
1301 | } | |
1302 | return pthread_join(kconsumerd_thread, &status); | |
1303 | } else { | |
1304 | return 0; | |
1305 | } | |
1306 | } | |
1307 | ||
8c0faa1d | 1308 | /* |
d063d709 | 1309 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1310 | * |
d063d709 | 1311 | * Return pid if successful else -1. |
8c0faa1d | 1312 | */ |
693bd40b | 1313 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1314 | { |
1315 | int ret; | |
1316 | pid_t pid; | |
53086306 | 1317 | const char *verbosity; |
8c0faa1d | 1318 | |
c49dc785 DG |
1319 | DBG("Spawning kconsumerd"); |
1320 | ||
8c0faa1d DG |
1321 | pid = fork(); |
1322 | if (pid == 0) { | |
1323 | /* | |
1324 | * Exec kconsumerd. | |
1325 | */ | |
31f73cc9 | 1326 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1327 | verbosity = "--verbose"; |
1328 | } else { | |
1329 | verbosity = "--quiet"; | |
1330 | } | |
1331 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1332 | if (errno != 0) { |
1333 | perror("kernel start consumer exec"); | |
1334 | } | |
1335 | exit(EXIT_FAILURE); | |
1336 | } else if (pid > 0) { | |
1337 | ret = pid; | |
1338 | goto error; | |
1339 | } else { | |
1340 | perror("kernel start consumer fork"); | |
1341 | ret = -errno; | |
1342 | goto error; | |
1343 | } | |
1344 | ||
1345 | error: | |
1346 | return ret; | |
1347 | } | |
1348 | ||
693bd40b | 1349 | /* |
d063d709 | 1350 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1351 | */ |
1352 | static int start_kconsumerd(void) | |
1353 | { | |
1354 | int ret; | |
1355 | ||
693bd40b | 1356 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1357 | if (kconsumerd_pid != 0) { |
817153bb | 1358 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1359 | goto end; |
1360 | } | |
693bd40b | 1361 | |
c49dc785 DG |
1362 | ret = spawn_kconsumerd(); |
1363 | if (ret < 0) { | |
1364 | ERR("Spawning kconsumerd failed"); | |
1365 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1366 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1367 | goto error; | |
693bd40b | 1368 | } |
c49dc785 DG |
1369 | |
1370 | /* Setting up the global kconsumerd_pid */ | |
1371 | kconsumerd_pid = ret; | |
693bd40b DG |
1372 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1373 | ||
6f61d021 DG |
1374 | DBG("Kconsumerd pid %d", ret); |
1375 | ||
693bd40b | 1376 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1377 | ret = spawn_kconsumerd_thread(); |
1378 | if (ret < 0) { | |
1379 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1380 | goto error; |
1381 | } | |
1382 | ||
c49dc785 | 1383 | end: |
693bd40b DG |
1384 | return 0; |
1385 | ||
1386 | error: | |
1387 | return ret; | |
1388 | } | |
1389 | ||
b73401da | 1390 | /* |
d063d709 | 1391 | * modprobe_kernel_modules |
b73401da DG |
1392 | */ |
1393 | static int modprobe_kernel_modules(void) | |
1394 | { | |
ab147185 | 1395 | int ret = 0, i; |
b73401da DG |
1396 | char modprobe[256]; |
1397 | ||
ab147185 MD |
1398 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1399 | ret = snprintf(modprobe, sizeof(modprobe), | |
1400 | "/sbin/modprobe %s%s", | |
1401 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1402 | kernel_modules_list[i].name); | |
b73401da DG |
1403 | if (ret < 0) { |
1404 | perror("snprintf modprobe"); | |
1405 | goto error; | |
1406 | } | |
ab147185 | 1407 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1408 | ret = system(modprobe); |
ab147185 MD |
1409 | if (ret == -1) { |
1410 | ERR("Unable to launch modprobe for module %s", | |
1411 | kernel_modules_list[i].name); | |
1412 | } else if (kernel_modules_list[i].required | |
d9800920 | 1413 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1414 | ERR("Unable to load module %s", |
1415 | kernel_modules_list[i].name); | |
1416 | } else { | |
1417 | DBG("Modprobe successfully %s", | |
1418 | kernel_modules_list[i].name); | |
1419 | } | |
1420 | } | |
1421 | ||
1422 | error: | |
1423 | return ret; | |
1424 | } | |
1425 | ||
b73401da | 1426 | /* |
d063d709 | 1427 | * mount_debugfs |
b73401da DG |
1428 | */ |
1429 | static int mount_debugfs(char *path) | |
1430 | { | |
1431 | int ret; | |
1432 | char *type = "debugfs"; | |
1433 | ||
996b65c8 | 1434 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1435 | if (ret < 0) { |
1436 | goto error; | |
1437 | } | |
1438 | ||
1439 | ret = mount(type, path, type, 0, NULL); | |
1440 | if (ret < 0) { | |
1441 | perror("mount debugfs"); | |
1442 | goto error; | |
1443 | } | |
1444 | ||
1445 | DBG("Mounted debugfs successfully at %s", path); | |
1446 | ||
1447 | error: | |
1448 | return ret; | |
1449 | } | |
1450 | ||
8c0faa1d | 1451 | /* |
d063d709 | 1452 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1453 | */ |
f3ed775e | 1454 | static void init_kernel_tracer(void) |
8c0faa1d | 1455 | { |
b73401da DG |
1456 | int ret; |
1457 | char *proc_mounts = "/proc/mounts"; | |
1458 | char line[256]; | |
1459 | char *debugfs_path = NULL, *lttng_path; | |
1460 | FILE *fp; | |
1461 | ||
1462 | /* Detect debugfs */ | |
1463 | fp = fopen(proc_mounts, "r"); | |
1464 | if (fp == NULL) { | |
1465 | ERR("Unable to probe %s", proc_mounts); | |
1466 | goto error; | |
1467 | } | |
1468 | ||
1469 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1470 | if (strstr(line, "debugfs") != NULL) { | |
1471 | /* Remove first string */ | |
1472 | strtok(line, " "); | |
1473 | /* Dup string here so we can reuse line later on */ | |
1474 | debugfs_path = strdup(strtok(NULL, " ")); | |
1475 | DBG("Got debugfs path : %s", debugfs_path); | |
1476 | break; | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | fclose(fp); | |
1481 | ||
1482 | /* Mount debugfs if needded */ | |
1483 | if (debugfs_path == NULL) { | |
1484 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1485 | if (ret < 0) { | |
1486 | perror("asprintf debugfs path"); | |
1487 | goto error; | |
1488 | } | |
1489 | ret = mount_debugfs(debugfs_path); | |
1490 | if (ret < 0) { | |
1491 | goto error; | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | /* Modprobe lttng kernel modules */ | |
1496 | ret = modprobe_kernel_modules(); | |
1497 | if (ret < 0) { | |
1498 | goto error; | |
1499 | } | |
1500 | ||
1501 | /* Setup lttng kernel path */ | |
1502 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1503 | if (ret < 0) { | |
1504 | perror("asprintf lttng path"); | |
1505 | goto error; | |
1506 | } | |
1507 | ||
1508 | /* Open debugfs lttng */ | |
1509 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1510 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1511 | DBG("Failed to open %s", lttng_path); |
1512 | goto error; | |
8c0faa1d DG |
1513 | } |
1514 | ||
b73401da DG |
1515 | free(lttng_path); |
1516 | free(debugfs_path); | |
f3ed775e | 1517 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1518 | return; |
1519 | ||
1520 | error: | |
1521 | if (lttng_path) { | |
1522 | free(lttng_path); | |
1523 | } | |
1524 | if (debugfs_path) { | |
1525 | free(debugfs_path); | |
1526 | } | |
1527 | WARN("No kernel tracer available"); | |
1528 | kernel_tracer_fd = 0; | |
1529 | return; | |
f3ed775e | 1530 | } |
33a2b854 | 1531 | |
f3ed775e | 1532 | /* |
d063d709 DG |
1533 | * Start tracing by creating trace directory and sending FDs to the kernel |
1534 | * consumer. | |
f3ed775e DG |
1535 | */ |
1536 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1537 | { | |
f40799e8 | 1538 | int ret = 0; |
8c0faa1d | 1539 | |
f3ed775e | 1540 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1541 | /* |
1542 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1543 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1544 | * security check. | |
1545 | */ | |
1546 | if (session->consumer_fd == 0) { | |
1547 | session->consumer_fd = kconsumerd_cmd_sock; | |
1548 | } | |
1549 | ||
1550 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1551 | if (ret < 0) { |
1552 | ERR("Send kconsumerd fds failed"); | |
1553 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1554 | goto error; | |
1555 | } | |
1d4b027a | 1556 | |
f3ed775e DG |
1557 | session->kconsumer_fds_sent = 1; |
1558 | } | |
1d4b027a DG |
1559 | |
1560 | error: | |
1561 | return ret; | |
8c0faa1d DG |
1562 | } |
1563 | ||
7a485870 DG |
1564 | /* |
1565 | * Notify kernel thread to update it's pollfd. | |
1566 | */ | |
1567 | static int notify_kernel_pollfd(void) | |
1568 | { | |
1569 | int ret; | |
1570 | ||
1571 | /* Inform kernel thread of the new kernel channel */ | |
1572 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1573 | if (ret < 0) { | |
1574 | perror("write kernel poll pipe"); | |
1575 | } | |
1576 | ||
1577 | return ret; | |
1578 | } | |
1579 | ||
8c0faa1d | 1580 | /* |
d063d709 | 1581 | * Allocate a channel structure and fill it. |
8c0faa1d | 1582 | */ |
b389abbe MD |
1583 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1584 | char *name) | |
8c0faa1d | 1585 | { |
f3ed775e | 1586 | struct lttng_channel *chan; |
1d4b027a | 1587 | |
f3ed775e DG |
1588 | chan = malloc(sizeof(struct lttng_channel)); |
1589 | if (chan == NULL) { | |
1590 | perror("init channel malloc"); | |
1591 | goto error; | |
8c0faa1d | 1592 | } |
1d4b027a | 1593 | |
ed8f384d | 1594 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1595 | perror("snprintf channel name"); |
b389abbe | 1596 | goto error; |
f3ed775e DG |
1597 | } |
1598 | ||
1599 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1600 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1601 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1602 | |
b389abbe MD |
1603 | switch (domain_type) { |
1604 | case LTTNG_DOMAIN_KERNEL: | |
1605 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1606 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1607 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1608 | break; | |
1609 | /* TODO: add UST */ | |
1610 | default: | |
1611 | goto error; /* Not implemented */ | |
1612 | } | |
1613 | ||
f3ed775e | 1614 | return chan; |
b389abbe MD |
1615 | |
1616 | error: | |
1617 | free(chan); | |
1618 | return NULL; | |
8c0faa1d DG |
1619 | } |
1620 | ||
0177d773 DG |
1621 | /* |
1622 | * Create an UST session and add it to the session ust list. | |
1623 | */ | |
1624 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1625 | { | |
1626 | int ret = -1; | |
1627 | struct ltt_ust_session *lus; | |
1628 | ||
1629 | DBG("Creating UST session"); | |
1630 | ||
1631 | lus = trace_ust_create_session(session->path, pid); | |
1632 | if (lus == NULL) { | |
1633 | goto error; | |
1634 | } | |
1635 | ||
1636 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1637 | geteuid(), allowed_group()); | |
1638 | if (ret < 0) { | |
1639 | if (ret != -EEXIST) { | |
1640 | ERR("Trace directory creation error"); | |
1641 | goto error; | |
1642 | } | |
1643 | } | |
1644 | ||
1645 | /* Create session on the UST tracer */ | |
1646 | ret = ustctl_create_session(lus); | |
1647 | if (ret < 0) { | |
1648 | goto error; | |
1649 | } | |
1650 | ||
1651 | return 0; | |
1652 | ||
1653 | error: | |
1654 | free(lus); | |
1655 | return ret; | |
1656 | } | |
1657 | ||
333f285e | 1658 | /* |
d063d709 | 1659 | * Create a kernel tracer session then create the default channel. |
333f285e | 1660 | */ |
f3ed775e | 1661 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1662 | { |
f3ed775e | 1663 | int ret; |
f3ed775e DG |
1664 | |
1665 | DBG("Creating kernel session"); | |
1666 | ||
1667 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1668 | if (ret < 0) { | |
1669 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1670 | goto error; | |
333f285e DG |
1671 | } |
1672 | ||
d9800920 DG |
1673 | /* Set kernel consumer socket fd */ |
1674 | if (kconsumerd_cmd_sock) { | |
1675 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1676 | } | |
1677 | ||
63053e7c DG |
1678 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1679 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1680 | if (ret < 0) { |
996b65c8 | 1681 | if (ret != -EEXIST) { |
7a485870 DG |
1682 | ERR("Trace directory creation error"); |
1683 | goto error; | |
1684 | } | |
1685 | } | |
1686 | ||
f3ed775e DG |
1687 | error: |
1688 | return ret; | |
333f285e DG |
1689 | } |
1690 | ||
6c9cc2ab DG |
1691 | /* |
1692 | * Using the session list, filled a lttng_session array to send back to the | |
1693 | * client for session listing. | |
1694 | * | |
1695 | * The session list lock MUST be acquired before calling this function. Use | |
1696 | * lock_session_list() and unlock_session_list(). | |
1697 | */ | |
1698 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1699 | { | |
1700 | int i = 0; | |
1701 | struct ltt_session *session; | |
1702 | ||
1703 | DBG("Getting all available session"); | |
1704 | /* | |
1705 | * Iterate over session list and append data after the control struct in | |
1706 | * the buffer. | |
1707 | */ | |
1708 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1709 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1710 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1711 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1712 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1713 | i++; |
1714 | } | |
1715 | } | |
1716 | ||
9f19cc17 DG |
1717 | /* |
1718 | * Fill lttng_channel array of all channels. | |
1719 | */ | |
1720 | static void list_lttng_channels(struct ltt_session *session, | |
1721 | struct lttng_channel *channels) | |
1722 | { | |
1723 | int i = 0; | |
1724 | struct ltt_kernel_channel *kchan; | |
1725 | ||
1726 | DBG("Listing channels for session %s", session->name); | |
1727 | ||
1728 | /* Kernel channels */ | |
1729 | if (session->kernel_session != NULL) { | |
1730 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
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; | |
1775 | } | |
1776 | i++; | |
1777 | } | |
1778 | } | |
1779 | ||
fac6795d | 1780 | /* |
d063d709 DG |
1781 | * Process the command requested by the lttng client within the command |
1782 | * context structure. This function make sure that the return structure (llm) | |
1783 | * is set and ready for transmission before returning. | |
fac6795d | 1784 | * |
e065084a | 1785 | * Return any error encountered or 0 for success. |
fac6795d | 1786 | */ |
5461b305 | 1787 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1788 | { |
f40799e8 | 1789 | int ret = LTTCOMM_OK; |
fac6795d | 1790 | |
5461b305 | 1791 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1792 | |
63053e7c DG |
1793 | /* |
1794 | * Commands that DO NOT need a session. | |
1795 | */ | |
5461b305 | 1796 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1797 | case LTTNG_CREATE_SESSION: |
1798 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1799 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1800 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1801 | break; |
1802 | default: | |
42abccdb DG |
1803 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1804 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1805 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1806 | /* If session name not found */ |
42abccdb | 1807 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1808 | ret = LTTCOMM_SESS_NOT_FOUND; |
1809 | } else { /* If no session name specified */ | |
1810 | ret = LTTCOMM_SELECT_SESS; | |
1811 | } | |
5461b305 | 1812 | goto error; |
b5541356 DG |
1813 | } else { |
1814 | /* Acquire lock for the session */ | |
1815 | lock_session(cmd_ctx->session); | |
379473d2 | 1816 | } |
5e16da05 | 1817 | break; |
379473d2 DG |
1818 | } |
1819 | ||
f3ed775e | 1820 | /* |
d0254c7c | 1821 | * Check domain type for specific "pre-action". |
f3ed775e | 1822 | */ |
0d0c377a DG |
1823 | switch (cmd_ctx->lsm->domain.type) { |
1824 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1825 | /* Kernel tracer check */ |
20fe2104 | 1826 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1827 | init_kernel_tracer(); |
1828 | if (kernel_tracer_fd == 0) { | |
1829 | ret = LTTCOMM_KERN_NA; | |
1830 | goto error; | |
1831 | } | |
20fe2104 | 1832 | } |
f3ed775e | 1833 | /* Need a session for kernel command */ |
d0254c7c | 1834 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1835 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1836 | case LTTNG_CREATE_SESSION: |
1837 | case LTTNG_LIST_SESSIONS: | |
1838 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1839 | break; |
1840 | default: | |
1841 | if (cmd_ctx->session->kernel_session == NULL) { | |
1842 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1843 | if (ret < 0) { |
d0254c7c | 1844 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1845 | goto error; |
1846 | } | |
d0254c7c | 1847 | /* Start the kernel consumer daemon */ |
d9800920 DG |
1848 | if (kconsumerd_pid == 0 && |
1849 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1850 | ret = start_kconsumerd(); |
1851 | if (ret < 0) { | |
1852 | goto error; | |
1853 | } | |
1854 | } | |
f3ed775e DG |
1855 | } |
1856 | } | |
0d0c377a | 1857 | break; |
0fdd1e2c DG |
1858 | case LTTNG_DOMAIN_UST_PID: |
1859 | break; | |
0d0c377a DG |
1860 | default: |
1861 | break; | |
20fe2104 DG |
1862 | } |
1863 | ||
fac6795d | 1864 | /* Process by command type */ |
5461b305 | 1865 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1866 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1867 | { |
b579acd9 | 1868 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1869 | |
1870 | /* Setup lttng message with no payload */ | |
1871 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1872 | if (ret < 0) { | |
1873 | goto setup_error; | |
1874 | } | |
1875 | ||
b579acd9 DG |
1876 | switch (cmd_ctx->lsm->domain.type) { |
1877 | case LTTNG_DOMAIN_KERNEL: | |
1878 | /* Create Kernel context */ | |
1879 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1880 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1881 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1882 | strncpy(kctx.u.perf_counter.name, | |
1883 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1884 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1885 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1886 | |
1887 | /* Add kernel context to kernel tracer. See context.c */ | |
1888 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1889 | cmd_ctx->lsm->u.context.event_name, | |
1890 | cmd_ctx->lsm->u.context.channel_name); | |
1891 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1892 | goto error; |
1893 | } | |
b579acd9 DG |
1894 | break; |
1895 | default: | |
1896 | /* TODO: Userspace tracing */ | |
1897 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1898 | goto error; |
d65106b1 DG |
1899 | } |
1900 | ||
1901 | ret = LTTCOMM_OK; | |
1902 | break; | |
1903 | } | |
0b97ec54 | 1904 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1905 | { |
0b97ec54 | 1906 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1907 | |
1908 | /* Setup lttng message with no payload */ | |
1909 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1910 | if (ret < 0) { | |
1911 | goto setup_error; | |
1912 | } | |
1913 | ||
0b97ec54 DG |
1914 | switch (cmd_ctx->lsm->domain.type) { |
1915 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1916 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1917 | cmd_ctx->session->kernel_session); |
1918 | if (kchan == NULL) { | |
1919 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1920 | goto error; |
0b97ec54 DG |
1921 | } else if (kchan->enabled == 1) { |
1922 | ret = kernel_disable_channel(kchan); | |
1923 | if (ret < 0) { | |
1924 | if (ret != EEXIST) { | |
1925 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1926 | } | |
1927 | goto error; | |
1928 | } | |
26cc6b4e | 1929 | } |
0b97ec54 DG |
1930 | kernel_wait_quiescent(kernel_tracer_fd); |
1931 | break; | |
1932 | default: | |
1933 | /* TODO: Userspace tracing */ | |
1934 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1935 | goto error; | |
26cc6b4e DG |
1936 | } |
1937 | ||
26cc6b4e DG |
1938 | ret = LTTCOMM_OK; |
1939 | break; | |
1940 | } | |
f5177a38 | 1941 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1942 | { |
f5177a38 DG |
1943 | struct ltt_kernel_channel *kchan; |
1944 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1945 | |
1946 | /* Setup lttng message with no payload */ | |
1947 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1948 | if (ret < 0) { | |
1949 | goto setup_error; | |
1950 | } | |
1951 | ||
f5177a38 DG |
1952 | switch (cmd_ctx->lsm->domain.type) { |
1953 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1954 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1955 | cmd_ctx->session->kernel_session); |
1956 | if (kchan == NULL) { | |
1957 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1958 | goto error; |
e953ef25 | 1959 | } |
f5177a38 | 1960 | |
62499ad6 | 1961 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1962 | if (kevent != NULL) { |
1963 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1964 | kchan->channel->name); | |
1965 | ret = kernel_disable_event(kevent); | |
1966 | if (ret < 0) { | |
1967 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1968 | goto error; | |
1969 | } | |
1970 | } | |
1971 | ||
1972 | kernel_wait_quiescent(kernel_tracer_fd); | |
1973 | break; | |
1974 | default: | |
1975 | /* TODO: Userspace tracing */ | |
1976 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1977 | goto error; | |
e953ef25 DG |
1978 | } |
1979 | ||
19e70852 | 1980 | ret = LTTCOMM_OK; |
e953ef25 DG |
1981 | break; |
1982 | } | |
f5177a38 | 1983 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1984 | { |
f5177a38 DG |
1985 | struct ltt_kernel_channel *kchan; |
1986 | struct ltt_kernel_event *kevent; | |
950131af DG |
1987 | |
1988 | /* Setup lttng message with no payload */ | |
1989 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1990 | if (ret < 0) { | |
1991 | goto setup_error; | |
1992 | } | |
1993 | ||
f5177a38 DG |
1994 | switch (cmd_ctx->lsm->domain.type) { |
1995 | case LTTNG_DOMAIN_KERNEL: | |
1996 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 1997 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1998 | cmd_ctx->session->kernel_session); |
1999 | if (kchan == NULL) { | |
2000 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2001 | goto error; | |
2002 | } | |
950131af | 2003 | |
f5177a38 DG |
2004 | /* For each event in the kernel session */ |
2005 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2006 | DBG("Disabling kernel event %s for channel %s.", | |
2007 | kevent->event->name, kchan->channel->name); | |
2008 | ret = kernel_disable_event(kevent); | |
2009 | if (ret < 0) { | |
2010 | continue; | |
2011 | } | |
950131af | 2012 | } |
f5177a38 DG |
2013 | |
2014 | /* Quiescent wait after event disable */ | |
2015 | kernel_wait_quiescent(kernel_tracer_fd); | |
2016 | break; | |
2017 | default: | |
2018 | /* TODO: Userspace tracing */ | |
2019 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2020 | goto error; | |
950131af DG |
2021 | } |
2022 | ||
950131af DG |
2023 | ret = LTTCOMM_OK; |
2024 | break; | |
2025 | } | |
0d0c377a | 2026 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 2027 | { |
0d0c377a | 2028 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
2029 | |
2030 | /* Setup lttng message with no payload */ | |
2031 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2032 | if (ret < 0) { | |
2033 | goto setup_error; | |
2034 | } | |
2035 | ||
0d0c377a DG |
2036 | switch (cmd_ctx->lsm->domain.type) { |
2037 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2038 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
0d0c377a DG |
2039 | cmd_ctx->session->kernel_session); |
2040 | if (kchan == NULL) { | |
2041 | /* Channel not found, creating it */ | |
2042 | DBG("Creating kernel channel"); | |
7d29a247 | 2043 | |
0d0c377a | 2044 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
2045 | &cmd_ctx->lsm->u.channel.chan, |
2046 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
2047 | if (ret < 0) { |
2048 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2049 | goto error; | |
2050 | } | |
7d29a247 | 2051 | |
0d0c377a DG |
2052 | /* Notify kernel thread that there is a new channel */ |
2053 | ret = notify_kernel_pollfd(); | |
2054 | if (ret < 0) { | |
2055 | ret = LTTCOMM_FATAL; | |
2056 | goto error; | |
2057 | } | |
2058 | } else if (kchan->enabled == 0) { | |
2059 | ret = kernel_enable_channel(kchan); | |
2060 | if (ret < 0) { | |
2061 | if (ret != EEXIST) { | |
2062 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
2063 | } | |
2064 | goto error; | |
d36b8583 | 2065 | } |
d36b8583 | 2066 | } |
0d0c377a DG |
2067 | |
2068 | kernel_wait_quiescent(kernel_tracer_fd); | |
2069 | break; | |
0177d773 | 2070 | case LTTNG_DOMAIN_UST_PID: |
0fdd1e2c | 2071 | |
0d0c377a DG |
2072 | break; |
2073 | default: | |
0d0c377a DG |
2074 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2075 | goto error; | |
d36b8583 DG |
2076 | } |
2077 | ||
d36b8583 DG |
2078 | ret = LTTCOMM_OK; |
2079 | break; | |
2080 | } | |
0d0c377a | 2081 | case LTTNG_ENABLE_EVENT: |
894be886 | 2082 | { |
7d29a247 DG |
2083 | char *channel_name; |
2084 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 2085 | struct ltt_kernel_event *kevent; |
7d29a247 | 2086 | struct lttng_channel *chan; |
f3ed775e | 2087 | |
894be886 DG |
2088 | /* Setup lttng message with no payload */ |
2089 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2090 | if (ret < 0) { | |
2091 | goto setup_error; | |
2092 | } | |
2093 | ||
7d29a247 DG |
2094 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2095 | ||
0d0c377a DG |
2096 | switch (cmd_ctx->lsm->domain.type) { |
2097 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2098 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2099 | cmd_ctx->session->kernel_session); |
2100 | if (kchan == NULL) { | |
2101 | DBG("Channel not found. Creating channel %s", channel_name); | |
2102 | ||
2103 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2104 | if (chan == NULL) { | |
2105 | ret = LTTCOMM_FATAL; | |
2106 | goto error; | |
2107 | } | |
2108 | ||
2109 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2110 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2111 | if (ret < 0) { | |
2112 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2113 | goto error; | |
2114 | } | |
62499ad6 | 2115 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2116 | cmd_ctx->session->kernel_session); |
2117 | if (kchan == NULL) { | |
b389abbe MD |
2118 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2119 | channel_name); | |
2120 | ret = LTTCOMM_FATAL; | |
2121 | goto error; | |
7d29a247 | 2122 | } |
b389abbe | 2123 | } |
7d29a247 | 2124 | |
62499ad6 | 2125 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2126 | if (kevent == NULL) { |
2127 | DBG("Creating kernel event %s for channel %s.", | |
2128 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2129 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2130 | } else { | |
2131 | DBG("Enabling kernel event %s for channel %s.", | |
2132 | kevent->event->name, channel_name); | |
2133 | ret = kernel_enable_event(kevent); | |
2134 | if (ret == -EEXIST) { | |
2135 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2136 | goto error; |
2137 | } | |
2138 | } | |
f34daff7 | 2139 | |
0d0c377a DG |
2140 | if (ret < 0) { |
2141 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2142 | goto error; |
2143 | } | |
19e70852 | 2144 | |
0d0c377a DG |
2145 | kernel_wait_quiescent(kernel_tracer_fd); |
2146 | break; | |
2147 | default: | |
2148 | /* TODO: Userspace tracing */ | |
2149 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2150 | goto error; |
f3ed775e | 2151 | } |
19e70852 | 2152 | ret = LTTCOMM_OK; |
894be886 DG |
2153 | break; |
2154 | } | |
0d0c377a | 2155 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2156 | { |
9f19cc17 DG |
2157 | int size, i; |
2158 | char *channel_name; | |
7d29a247 | 2159 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2160 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2161 | struct lttng_event *event_list; |
7d29a247 | 2162 | struct lttng_channel *chan; |
33a2b854 DG |
2163 | |
2164 | /* Setup lttng message with no payload */ | |
2165 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2166 | if (ret < 0) { | |
2167 | goto setup_error; | |
2168 | } | |
2169 | ||
2170 | DBG("Enabling all kernel event"); | |
2171 | ||
7d29a247 DG |
2172 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2173 | ||
0d0c377a DG |
2174 | switch (cmd_ctx->lsm->domain.type) { |
2175 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2176 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2177 | cmd_ctx->session->kernel_session); |
2178 | if (kchan == NULL) { | |
2179 | DBG("Channel not found. Creating channel %s", channel_name); | |
2180 | ||
2181 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2182 | if (chan == NULL) { | |
2183 | ret = LTTCOMM_FATAL; | |
2184 | goto error; | |
2185 | } | |
2186 | ||
2187 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2188 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2189 | if (ret < 0) { | |
2190 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2191 | goto error; | |
2192 | } | |
62499ad6 | 2193 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2194 | cmd_ctx->session->kernel_session); |
2195 | if (kchan == NULL) { | |
b389abbe MD |
2196 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2197 | channel_name); | |
2198 | ret = LTTCOMM_FATAL; | |
2199 | goto error; | |
7d29a247 | 2200 | } |
b389abbe | 2201 | } |
7d29a247 | 2202 | |
0d0c377a DG |
2203 | /* For each event in the kernel session */ |
2204 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2205 | DBG("Enabling kernel event %s for channel %s.", | |
2206 | kevent->event->name, channel_name); | |
2207 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2208 | if (ret < 0) { |
0d0c377a | 2209 | continue; |
7d29a247 DG |
2210 | } |
2211 | } | |
33a2b854 | 2212 | |
0d0c377a DG |
2213 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2214 | if (size < 0) { | |
2215 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2216 | goto error; | |
f3ed775e | 2217 | } |
f3ed775e | 2218 | |
0d0c377a | 2219 | for (i = 0; i < size; i++) { |
62499ad6 | 2220 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2221 | if (kevent == NULL) { |
2222 | /* Default event type for enable all */ | |
2223 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2224 | /* Enable each single tracepoint event */ | |
2225 | ret = kernel_create_event(&event_list[i], kchan); | |
2226 | if (ret < 0) { | |
2227 | /* Ignore error here and continue */ | |
2228 | } | |
950131af | 2229 | } |
33a2b854 | 2230 | } |
33a2b854 | 2231 | |
0d0c377a DG |
2232 | free(event_list); |
2233 | ||
2234 | /* Quiescent wait after event enable */ | |
2235 | kernel_wait_quiescent(kernel_tracer_fd); | |
2236 | break; | |
2237 | default: | |
2238 | /* TODO: Userspace tracing */ | |
2239 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2240 | goto error; | |
2241 | } | |
33a2b854 DG |
2242 | |
2243 | ret = LTTCOMM_OK; | |
2244 | break; | |
2245 | } | |
052da939 | 2246 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2247 | { |
9f19cc17 | 2248 | struct lttng_event *events; |
052da939 DG |
2249 | ssize_t nb_events = 0; |
2250 | ||
2251 | switch (cmd_ctx->lsm->domain.type) { | |
2252 | case LTTNG_DOMAIN_KERNEL: | |
2253 | DBG("Listing kernel events"); | |
2254 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2255 | if (nb_events < 0) { | |
2256 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2257 | goto error; | |
2258 | } | |
2259 | break; | |
2260 | default: | |
2261 | /* TODO: Userspace listing */ | |
2262 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2263 | break; | |
2ef84c95 DG |
2264 | } |
2265 | ||
2266 | /* | |
2267 | * Setup lttng message with payload size set to the event list size in | |
2268 | * bytes and then copy list into the llm payload. | |
2269 | */ | |
052da939 | 2270 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2271 | if (ret < 0) { |
052da939 | 2272 | free(events); |
2ef84c95 DG |
2273 | goto setup_error; |
2274 | } | |
2275 | ||
2276 | /* Copy event list into message payload */ | |
9f19cc17 | 2277 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2278 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2279 | |
9f19cc17 | 2280 | free(events); |
2ef84c95 DG |
2281 | |
2282 | ret = LTTCOMM_OK; | |
2283 | break; | |
2284 | } | |
f3ed775e | 2285 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2286 | { |
2287 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2288 | |
8c0faa1d DG |
2289 | /* Setup lttng message with no payload */ |
2290 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2291 | if (ret < 0) { | |
2292 | goto setup_error; | |
2293 | } | |
2294 | ||
f3ed775e DG |
2295 | /* Kernel tracing */ |
2296 | if (cmd_ctx->session->kernel_session != NULL) { | |
2297 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2298 | DBG("Open kernel metadata"); | |
58a97671 | 2299 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2300 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2301 | if (ret < 0) { |
2302 | ret = LTTCOMM_KERN_META_FAIL; | |
2303 | goto error; | |
2304 | } | |
2305 | } | |
8c0faa1d | 2306 | |
f3ed775e DG |
2307 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2308 | DBG("Opening kernel metadata stream"); | |
2309 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2310 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2311 | if (ret < 0) { | |
2312 | ERR("Kernel create metadata stream failed"); | |
2313 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2314 | goto error; | |
2315 | } | |
2316 | } | |
2317 | } | |
8c0faa1d | 2318 | |
f3ed775e | 2319 | /* For each channel */ |
0d0c377a DG |
2320 | cds_list_for_each_entry(chan, |
2321 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2322 | if (chan->stream_count == 0) { |
2323 | ret = kernel_open_channel_stream(chan); | |
2324 | if (ret < 0) { | |
2325 | ERR("Kernel create channel stream failed"); | |
2326 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2327 | goto error; | |
2328 | } | |
2329 | /* Update the stream global counter */ | |
2330 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2331 | } | |
2332 | } | |
2333 | ||
283046e0 | 2334 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2335 | if (ret < 0) { |
f3ed775e | 2336 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2337 | goto error; |
2338 | } | |
8c0faa1d | 2339 | |
283046e0 DG |
2340 | DBG("Start kernel tracing"); |
2341 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2342 | if (ret < 0) { |
283046e0 | 2343 | ERR("Kernel start session failed"); |
f3ed775e | 2344 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2345 | goto error; |
2346 | } | |
8c0faa1d | 2347 | |
f3ed775e DG |
2348 | /* Quiescent wait after starting trace */ |
2349 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2350 | } |
2351 | ||
f3ed775e | 2352 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2353 | |
2354 | ret = LTTCOMM_OK; | |
2355 | break; | |
2356 | } | |
f3ed775e | 2357 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2358 | { |
f3ed775e | 2359 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2360 | /* Setup lttng message with no payload */ |
2361 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2362 | if (ret < 0) { | |
2363 | goto setup_error; | |
2364 | } | |
2365 | ||
f3ed775e DG |
2366 | /* Kernel tracer */ |
2367 | if (cmd_ctx->session->kernel_session != NULL) { | |
2368 | DBG("Stop kernel tracing"); | |
84291629 | 2369 | |
f3ed775e DG |
2370 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2371 | if (ret < 0) { | |
2372 | ERR("Kernel metadata flush failed"); | |
2373 | } | |
8c0faa1d | 2374 | |
f3ed775e DG |
2375 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2376 | ret = kernel_flush_buffer(chan); | |
2377 | if (ret < 0) { | |
2378 | ERR("Kernel flush buffer error"); | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2383 | if (ret < 0) { | |
2384 | ERR("Kernel stop session failed"); | |
2385 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2386 | goto error; | |
2387 | } | |
2388 | ||
2389 | /* Quiescent wait after stopping trace */ | |
2390 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2391 | } |
2392 | ||
f3ed775e | 2393 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2394 | |
2395 | ret = LTTCOMM_OK; | |
2396 | break; | |
2397 | } | |
5e16da05 MD |
2398 | case LTTNG_CREATE_SESSION: |
2399 | { | |
5461b305 DG |
2400 | /* Setup lttng message with no payload */ |
2401 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2402 | if (ret < 0) { | |
2403 | goto setup_error; | |
2404 | } | |
2405 | ||
3c6bae61 | 2406 | tracepoint(create_session_start); |
42abccdb | 2407 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
3c6bae61 | 2408 | tracepoint(create_session_end); |
5e16da05 | 2409 | if (ret < 0) { |
f3ed775e | 2410 | if (ret == -EEXIST) { |
5e16da05 MD |
2411 | ret = LTTCOMM_EXIST_SESS; |
2412 | } else { | |
aaf97519 | 2413 | ret = LTTCOMM_FATAL; |
aaf97519 | 2414 | } |
5461b305 | 2415 | goto error; |
8028d920 | 2416 | } |
1657e9bb | 2417 | |
5461b305 | 2418 | ret = LTTCOMM_OK; |
5e16da05 MD |
2419 | break; |
2420 | } | |
2421 | case LTTNG_DESTROY_SESSION: | |
2422 | { | |
5461b305 DG |
2423 | /* Setup lttng message with no payload */ |
2424 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2425 | if (ret < 0) { | |
2426 | goto setup_error; | |
2427 | } | |
2428 | ||
f3ed775e DG |
2429 | /* Clean kernel session teardown */ |
2430 | teardown_kernel_session(cmd_ctx->session); | |
2431 | ||
3c6bae61 | 2432 | tracepoint(destroy_session_start); |
42abccdb | 2433 | ret = destroy_session(cmd_ctx->lsm->session.name); |
3c6bae61 | 2434 | tracepoint(destroy_session_end); |
5e16da05 | 2435 | if (ret < 0) { |
f3ed775e | 2436 | ret = LTTCOMM_FATAL; |
5461b305 | 2437 | goto error; |
5e16da05 | 2438 | } |
1657e9bb | 2439 | |
7a485870 DG |
2440 | /* |
2441 | * Must notify the kernel thread here to update it's pollfd in order to | |
2442 | * remove the channel(s)' fd just destroyed. | |
2443 | */ | |
2444 | ret = notify_kernel_pollfd(); | |
2445 | if (ret < 0) { | |
2446 | ret = LTTCOMM_FATAL; | |
2447 | goto error; | |
2448 | } | |
2449 | ||
5461b305 DG |
2450 | ret = LTTCOMM_OK; |
2451 | break; | |
5e16da05 | 2452 | } |
9f19cc17 | 2453 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2454 | { |
4b222185 | 2455 | size_t nb_dom = 0; |
5461b305 | 2456 | |
9f19cc17 DG |
2457 | if (cmd_ctx->session->kernel_session != NULL) { |
2458 | nb_dom++; | |
ce3d728c | 2459 | } |
520ff687 | 2460 | |
0177d773 | 2461 | nb_dom += cmd_ctx->session->ust_session_list.count; |
9f19cc17 DG |
2462 | |
2463 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2464 | if (ret < 0) { |
2465 | goto setup_error; | |
520ff687 | 2466 | } |
57167058 | 2467 | |
9f19cc17 DG |
2468 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2469 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2470 | |
9f19cc17 | 2471 | /* TODO: User-space tracer domain support */ |
5461b305 | 2472 | ret = LTTCOMM_OK; |
5e16da05 MD |
2473 | break; |
2474 | } | |
9f19cc17 | 2475 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2476 | { |
9f19cc17 DG |
2477 | /* |
2478 | * TODO: Only kernel channels are listed here. UST listing | |
2479 | * is needed on lttng-ust 2.0 release. | |
2480 | */ | |
2481 | size_t nb_chan = 0; | |
2482 | if (cmd_ctx->session->kernel_session != NULL) { | |
2483 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2484 | } |
ca95a216 | 2485 | |
9f19cc17 DG |
2486 | ret = setup_lttng_msg(cmd_ctx, |
2487 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2488 | if (ret < 0) { |
2489 | goto setup_error; | |
2490 | } | |
9f19cc17 DG |
2491 | |
2492 | list_lttng_channels(cmd_ctx->session, | |
2493 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2494 | ||
2495 | ret = LTTCOMM_OK; | |
5461b305 | 2496 | break; |
5e16da05 | 2497 | } |
9f19cc17 | 2498 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2499 | { |
9f19cc17 DG |
2500 | /* |
2501 | * TODO: Only kernel events are listed here. UST listing | |
2502 | * is needed on lttng-ust 2.0 release. | |
2503 | */ | |
2504 | size_t nb_event = 0; | |
2505 | struct ltt_kernel_channel *kchan = NULL; | |
2506 | ||
2507 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2508 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2509 | cmd_ctx->session->kernel_session); |
2510 | if (kchan == NULL) { | |
2511 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2512 | goto error; | |
2513 | } | |
2514 | nb_event += kchan->event_count; | |
5461b305 | 2515 | } |
ca95a216 | 2516 | |
9f19cc17 DG |
2517 | ret = setup_lttng_msg(cmd_ctx, |
2518 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2519 | if (ret < 0) { |
2520 | goto setup_error; | |
2521 | } | |
9f19cc17 | 2522 | |
ced2f820 | 2523 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2524 | |
2525 | list_lttng_events(kchan, | |
2526 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2527 | ||
2528 | ret = LTTCOMM_OK; | |
5461b305 | 2529 | break; |
5e16da05 MD |
2530 | } |
2531 | case LTTNG_LIST_SESSIONS: | |
2532 | { | |
6c9cc2ab | 2533 | lock_session_list(); |
5461b305 | 2534 | |
6c9cc2ab | 2535 | if (session_list_ptr->count == 0) { |
f3ed775e | 2536 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2537 | unlock_session_list(); |
5461b305 | 2538 | goto error; |
57167058 | 2539 | } |
5e16da05 | 2540 | |
6c9cc2ab DG |
2541 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2542 | session_list_ptr->count); | |
5461b305 | 2543 | if (ret < 0) { |
36a83748 | 2544 | unlock_session_list(); |
5461b305 | 2545 | goto setup_error; |
e065084a | 2546 | } |
5e16da05 | 2547 | |
6c9cc2ab DG |
2548 | /* Filled the session array */ |
2549 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2550 | ||
2551 | unlock_session_list(); | |
5e16da05 | 2552 | |
5461b305 | 2553 | ret = LTTCOMM_OK; |
5e16da05 MD |
2554 | break; |
2555 | } | |
d0254c7c MD |
2556 | case LTTNG_CALIBRATE: |
2557 | { | |
2558 | /* Setup lttng message with no payload */ | |
2559 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2560 | if (ret < 0) { | |
2561 | goto setup_error; | |
2562 | } | |
2563 | ||
2564 | switch (cmd_ctx->lsm->domain.type) { | |
2565 | case LTTNG_DOMAIN_KERNEL: | |
2566 | { | |
2567 | struct lttng_kernel_calibrate kcalibrate; | |
2568 | ||
2569 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2570 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2571 | if (ret < 0) { | |
2572 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2573 | goto error; | |
2574 | } | |
2575 | break; | |
2576 | } | |
2577 | default: | |
2578 | /* TODO: Userspace tracing */ | |
2579 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2580 | goto error; | |
2581 | } | |
2582 | ret = LTTCOMM_OK; | |
2583 | break; | |
2584 | } | |
d9800920 DG |
2585 | case LTTNG_REGISTER_CONSUMER: |
2586 | { | |
2587 | int sock; | |
2588 | ||
2589 | /* Setup lttng message with no payload */ | |
2590 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2591 | if (ret < 0) { | |
2592 | goto setup_error; | |
2593 | } | |
2594 | ||
2595 | switch (cmd_ctx->lsm->domain.type) { | |
2596 | case LTTNG_DOMAIN_KERNEL: | |
2597 | { | |
2598 | /* Can't register a consumer if there is already one */ | |
2599 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2600 | ret = LTTCOMM_CONNECT_FAIL; | |
2601 | goto error; | |
2602 | } | |
2603 | ||
2604 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2605 | if (sock < 0) { | |
2606 | ret = LTTCOMM_CONNECT_FAIL; | |
2607 | goto error; | |
2608 | } | |
2609 | ||
2610 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2611 | break; | |
2612 | } | |
2613 | default: | |
2614 | /* TODO: Userspace tracing */ | |
2615 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2616 | goto error; | |
2617 | } | |
2618 | ||
2619 | ret = LTTCOMM_OK; | |
2620 | break; | |
2621 | } | |
d0254c7c | 2622 | |
5e16da05 MD |
2623 | default: |
2624 | /* Undefined command */ | |
5461b305 DG |
2625 | ret = setup_lttng_msg(cmd_ctx, 0); |
2626 | if (ret < 0) { | |
2627 | goto setup_error; | |
2628 | } | |
2629 | ||
5e16da05 | 2630 | ret = LTTCOMM_UND; |
5461b305 | 2631 | break; |
fac6795d DG |
2632 | } |
2633 | ||
5461b305 DG |
2634 | /* Set return code */ |
2635 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2636 | |
b5541356 DG |
2637 | if (cmd_ctx->session) { |
2638 | unlock_session(cmd_ctx->session); | |
2639 | } | |
2640 | ||
e065084a DG |
2641 | return ret; |
2642 | ||
5461b305 | 2643 | error: |
5461b305 DG |
2644 | if (cmd_ctx->llm == NULL) { |
2645 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2646 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2647 | goto setup_error; |
2648 | } | |
2649 | } | |
e065084a | 2650 | /* Notify client of error */ |
5461b305 | 2651 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2652 | |
5461b305 | 2653 | setup_error: |
b5541356 DG |
2654 | if (cmd_ctx->session) { |
2655 | unlock_session(cmd_ctx->session); | |
2656 | } | |
8028d920 | 2657 | return ret; |
fac6795d DG |
2658 | } |
2659 | ||
1d4b027a | 2660 | /* |
d063d709 DG |
2661 | * This thread manage all clients request using the unix client socket for |
2662 | * communication. | |
1d4b027a DG |
2663 | */ |
2664 | static void *thread_manage_clients(void *data) | |
2665 | { | |
273ea72c DG |
2666 | int sock = 0, ret; |
2667 | struct command_ctx *cmd_ctx = NULL; | |
2668 | struct pollfd pollfd[2]; | |
1d4b027a | 2669 | |
b25a8868 DG |
2670 | tracepoint(sessiond_th_cli_start); |
2671 | ||
1d4b027a DG |
2672 | DBG("[thread] Manage client started"); |
2673 | ||
2674 | ret = lttcomm_listen_unix_sock(client_sock); | |
2675 | if (ret < 0) { | |
2676 | goto error; | |
2677 | } | |
2678 | ||
273ea72c DG |
2679 | /* First fd is always the quit pipe */ |
2680 | pollfd[0].fd = thread_quit_pipe[0]; | |
2681 | ||
2682 | /* Apps socket */ | |
2683 | pollfd[1].fd = client_sock; | |
2684 | pollfd[1].events = POLLIN; | |
2685 | ||
1d4b027a DG |
2686 | /* Notify parent pid that we are ready |
2687 | * to accept command for client side. | |
2688 | */ | |
2689 | if (opt_sig_parent) { | |
2690 | kill(ppid, SIGCHLD); | |
2691 | } | |
2692 | ||
2693 | while (1) { | |
1d4b027a | 2694 | DBG("Accepting client command ..."); |
273ea72c | 2695 | |
b25a8868 DG |
2696 | tracepoint(sessiond_th_cli_poll); |
2697 | ||
273ea72c DG |
2698 | /* Inifinite blocking call, waiting for transmission */ |
2699 | ret = poll(pollfd, 2, -1); | |
2700 | if (ret < 0) { | |
2701 | perror("poll client thread"); | |
2702 | goto error; | |
2703 | } | |
2704 | ||
2705 | /* Thread quit pipe has been closed. Killing thread. */ | |
2706 | if (pollfd[0].revents == POLLNVAL) { | |
2707 | goto error; | |
2708 | } else if (pollfd[1].revents == POLLERR) { | |
2709 | ERR("Client socket poll error"); | |
2710 | goto error; | |
2711 | } | |
2712 | ||
1d4b027a DG |
2713 | sock = lttcomm_accept_unix_sock(client_sock); |
2714 | if (sock < 0) { | |
2715 | goto error; | |
2716 | } | |
2717 | ||
2718 | /* Allocate context command to process the client request */ | |
2719 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2720 | ||
2721 | /* Allocate data buffer for reception */ | |
2722 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2723 | cmd_ctx->llm = NULL; | |
2724 | cmd_ctx->session = NULL; | |
2725 | ||
2726 | /* | |
2727 | * Data is received from the lttng client. The struct | |
2728 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2729 | * the client. | |
2730 | */ | |
2731 | DBG("Receiving data from client ..."); | |
2732 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2733 | if (ret <= 0) { | |
2734 | continue; | |
2735 | } | |
2736 | ||
f7776ea7 DG |
2737 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2738 | ||
1d4b027a DG |
2739 | /* |
2740 | * This function dispatch the work to the kernel or userspace tracer | |
2741 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2742 | * informations for the client. The command context struct contains | |
2743 | * everything this function may needs. | |
2744 | */ | |
2745 | ret = process_client_msg(cmd_ctx); | |
2746 | if (ret < 0) { | |
2747 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2748 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2749 | /* Error detected but still accept command */ | |
a2fb29a5 | 2750 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2751 | continue; |
2752 | } | |
2753 | ||
2754 | DBG("Sending response (size: %d, retcode: %d)", | |
2755 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2756 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2757 | if (ret < 0) { | |
2758 | ERR("Failed to send data back to client"); | |
2759 | } | |
2760 | ||
a2fb29a5 | 2761 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2762 | |
2763 | /* End of transmission */ | |
2764 | close(sock); | |
1d4b027a DG |
2765 | } |
2766 | ||
2767 | error: | |
273ea72c DG |
2768 | DBG("Client thread dying"); |
2769 | if (client_sock) { | |
2770 | close(client_sock); | |
2771 | } | |
2772 | if (sock) { | |
2773 | close(sock); | |
2774 | } | |
2775 | ||
2776 | unlink(client_unix_sock_path); | |
2777 | ||
a2fb29a5 | 2778 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2779 | return NULL; |
2780 | } | |
2781 | ||
2782 | ||
fac6795d DG |
2783 | /* |
2784 | * usage function on stderr | |
2785 | */ | |
2786 | static void usage(void) | |
2787 | { | |
b716ce68 | 2788 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2789 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2790 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2791 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2792 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2793 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2794 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2795 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2796 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2797 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2798 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2799 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2800 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2801 | } |
2802 | ||
2803 | /* | |
2804 | * daemon argument parsing | |
2805 | */ | |
2806 | static int parse_args(int argc, char **argv) | |
2807 | { | |
2808 | int c; | |
2809 | ||
2810 | static struct option long_options[] = { | |
2811 | { "client-sock", 1, 0, 'c' }, | |
2812 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2813 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2814 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2815 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2816 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2817 | { "help", 0, 0, 'h' }, |
2818 | { "group", 1, 0, 'g' }, | |
2819 | { "version", 0, 0, 'V' }, | |
75462a81 | 2820 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2821 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2822 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2823 | { NULL, 0, 0, 0 } |
2824 | }; | |
2825 | ||
2826 | while (1) { | |
2827 | int option_index = 0; | |
31f73cc9 | 2828 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2829 | if (c == -1) { |
2830 | break; | |
2831 | } | |
2832 | ||
2833 | switch (c) { | |
2834 | case 0: | |
2835 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2836 | if (optarg) { | |
2837 | fprintf(stderr, " with arg %s\n", optarg); | |
2838 | } | |
2839 | break; | |
b716ce68 | 2840 | case 'c': |
fac6795d DG |
2841 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2842 | break; | |
2843 | case 'a': | |
2844 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2845 | break; | |
2846 | case 'd': | |
2847 | opt_daemon = 1; | |
2848 | break; | |
2849 | case 'g': | |
2850 | opt_tracing_group = strdup(optarg); | |
2851 | break; | |
2852 | case 'h': | |
2853 | usage(); | |
2854 | exit(EXIT_FAILURE); | |
2855 | case 'V': | |
2856 | fprintf(stdout, "%s\n", VERSION); | |
2857 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2858 | case 'S': |
2859 | opt_sig_parent = 1; | |
2860 | break; | |
d6f42150 DG |
2861 | case 'E': |
2862 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2863 | break; | |
2864 | case 'C': | |
2865 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2866 | break; | |
75462a81 DG |
2867 | case 'q': |
2868 | opt_quiet = 1; | |
2869 | break; | |
3f9947db | 2870 | case 'v': |
53086306 DG |
2871 | /* Verbose level can increase using multiple -v */ |
2872 | opt_verbose += 1; | |
3f9947db | 2873 | break; |
31f73cc9 MD |
2874 | case 'Z': |
2875 | opt_verbose_kconsumerd += 1; | |
2876 | break; | |
fac6795d DG |
2877 | default: |
2878 | /* Unknown option or other error. | |
2879 | * Error is printed by getopt, just return */ | |
2880 | return -1; | |
2881 | } | |
2882 | } | |
2883 | ||
2884 | return 0; | |
2885 | } | |
2886 | ||
2887 | /* | |
d063d709 | 2888 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2889 | * apps_sock - The communication socket for all UST apps. |
2890 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2891 | */ |
cf3af59e | 2892 | static int init_daemon_socket(void) |
fac6795d DG |
2893 | { |
2894 | int ret = 0; | |
2895 | mode_t old_umask; | |
2896 | ||
2897 | old_umask = umask(0); | |
2898 | ||
2899 | /* Create client tool unix socket */ | |
d6f42150 DG |
2900 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2901 | if (client_sock < 0) { | |
2902 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2903 | ret = -1; |
2904 | goto end; | |
2905 | } | |
2906 | ||
2907 | /* File permission MUST be 660 */ | |
2908 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2909 | if (ret < 0) { | |
d6f42150 | 2910 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2911 | perror("chmod"); |
2912 | goto end; | |
2913 | } | |
2914 | ||
2915 | /* Create the application unix socket */ | |
d6f42150 DG |
2916 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2917 | if (apps_sock < 0) { | |
2918 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2919 | ret = -1; |
2920 | goto end; | |
2921 | } | |
2922 | ||
d6f42150 | 2923 | /* File permission MUST be 666 */ |
fac6795d DG |
2924 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2925 | if (ret < 0) { | |
d6f42150 | 2926 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2927 | perror("chmod"); |
2928 | goto end; | |
2929 | } | |
2930 | ||
2931 | end: | |
2932 | umask(old_umask); | |
2933 | return ret; | |
2934 | } | |
2935 | ||
2936 | /* | |
7d8234d9 MD |
2937 | * Check if the global socket is available, and if a daemon is answering |
2938 | * at the other side. If yes, error is returned. | |
fac6795d | 2939 | */ |
cf3af59e | 2940 | static int check_existing_daemon(void) |
fac6795d | 2941 | { |
7d8234d9 | 2942 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 2943 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 2944 | return 0; |
099e26bd | 2945 | } |
7d8234d9 | 2946 | /* Is there anybody out there ? */ |
099e26bd | 2947 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 2948 | return -EEXIST; |
099e26bd | 2949 | } else { |
7d8234d9 | 2950 | return 0; |
099e26bd | 2951 | } |
fac6795d DG |
2952 | } |
2953 | ||
fac6795d | 2954 | /* |
d063d709 | 2955 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2956 | * |
d063d709 DG |
2957 | * Race window between mkdir and chown is OK because we are going from more |
2958 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2959 | */ |
d6f42150 | 2960 | static int set_permissions(void) |
fac6795d DG |
2961 | { |
2962 | int ret; | |
996b65c8 | 2963 | gid_t gid; |
fac6795d | 2964 | |
996b65c8 MD |
2965 | gid = allowed_group(); |
2966 | if (gid < 0) { | |
a463f419 DG |
2967 | if (is_root) { |
2968 | WARN("No tracing group detected"); | |
2969 | ret = 0; | |
2970 | } else { | |
2971 | ERR("Missing tracing group. Aborting execution."); | |
2972 | ret = -1; | |
2973 | } | |
fac6795d DG |
2974 | goto end; |
2975 | } | |
2976 | ||
d6f42150 | 2977 | /* Set lttng run dir */ |
996b65c8 | 2978 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2979 | if (ret < 0) { |
2980 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2981 | perror("chown"); | |
2982 | } | |
2983 | ||
2984 | /* lttng client socket path */ | |
996b65c8 | 2985 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2986 | if (ret < 0) { |
d6f42150 DG |
2987 | ERR("Unable to set group on %s", client_unix_sock_path); |
2988 | perror("chown"); | |
2989 | } | |
2990 | ||
2991 | /* kconsumerd error socket path */ | |
996b65c8 | 2992 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2993 | if (ret < 0) { |
2994 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2995 | perror("chown"); |
2996 | } | |
2997 | ||
d6f42150 | 2998 | DBG("All permissions are set"); |
e07ae692 | 2999 | |
fac6795d DG |
3000 | end: |
3001 | return ret; | |
3002 | } | |
3003 | ||
7a485870 | 3004 | /* |
d063d709 | 3005 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3006 | */ |
3007 | static int create_kernel_poll_pipe(void) | |
3008 | { | |
3009 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3010 | } | |
3011 | ||
099e26bd DG |
3012 | /* |
3013 | * Create the application command pipe to wake thread_manage_apps. | |
3014 | */ | |
3015 | static int create_apps_cmd_pipe(void) | |
3016 | { | |
3017 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3018 | } | |
3019 | ||
d6f42150 | 3020 | /* |
d063d709 | 3021 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3022 | */ |
3023 | static int create_lttng_rundir(void) | |
3024 | { | |
3025 | int ret; | |
3026 | ||
3027 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3028 | if (ret < 0) { | |
b1f11e69 DG |
3029 | if (errno != EEXIST) { |
3030 | ERR("Unable to create " LTTNG_RUNDIR); | |
3031 | goto error; | |
3032 | } else { | |
3033 | ret = 0; | |
3034 | } | |
d6f42150 DG |
3035 | } |
3036 | ||
3037 | error: | |
3038 | return ret; | |
3039 | } | |
3040 | ||
3041 | /* | |
d063d709 DG |
3042 | * Setup sockets and directory needed by the kconsumerd communication with the |
3043 | * session daemon. | |
d6f42150 DG |
3044 | */ |
3045 | static int set_kconsumerd_sockets(void) | |
3046 | { | |
3047 | int ret; | |
3048 | ||
3049 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
3050 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
3051 | } | |
3052 | ||
3053 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
3054 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
3055 | } | |
3056 | ||
3057 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3058 | if (ret < 0) { | |
6beb2242 DG |
3059 | if (errno != EEXIST) { |
3060 | ERR("Failed to create " KCONSUMERD_PATH); | |
3061 | goto error; | |
3062 | } | |
3063 | ret = 0; | |
d6f42150 DG |
3064 | } |
3065 | ||
3066 | /* Create the kconsumerd error unix socket */ | |
3067 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
3068 | if (kconsumerd_err_sock < 0) { | |
3069 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3070 | ret = -1; | |
3071 | goto error; | |
3072 | } | |
3073 | ||
3074 | /* File permission MUST be 660 */ | |
3075 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3076 | if (ret < 0) { | |
3077 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3078 | perror("chmod"); | |
3079 | goto error; | |
3080 | } | |
3081 | ||
3082 | error: | |
3083 | return ret; | |
3084 | } | |
3085 | ||
fac6795d | 3086 | /* |
d063d709 | 3087 | * Signal handler for the daemon |
cf3af59e MD |
3088 | * |
3089 | * Simply stop all worker threads, leaving main() return gracefully | |
3090 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
3091 | */ |
3092 | static void sighandler(int sig) | |
3093 | { | |
3094 | switch (sig) { | |
cf3af59e MD |
3095 | case SIGPIPE: |
3096 | DBG("SIGPIPE catched"); | |
3097 | return; | |
3098 | case SIGINT: | |
3099 | DBG("SIGINT catched"); | |
3100 | stop_threads(); | |
3101 | break; | |
3102 | case SIGTERM: | |
3103 | DBG("SIGTERM catched"); | |
3104 | stop_threads(); | |
3105 | break; | |
3106 | default: | |
3107 | break; | |
fac6795d | 3108 | } |
fac6795d DG |
3109 | } |
3110 | ||
3111 | /* | |
d063d709 | 3112 | * Setup signal handler for : |
1d4b027a | 3113 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3114 | */ |
1d4b027a | 3115 | static int set_signal_handler(void) |
fac6795d | 3116 | { |
1d4b027a DG |
3117 | int ret = 0; |
3118 | struct sigaction sa; | |
3119 | sigset_t sigset; | |
fac6795d | 3120 | |
1d4b027a DG |
3121 | if ((ret = sigemptyset(&sigset)) < 0) { |
3122 | perror("sigemptyset"); | |
3123 | return ret; | |
3124 | } | |
d6f42150 | 3125 | |
1d4b027a DG |
3126 | sa.sa_handler = sighandler; |
3127 | sa.sa_mask = sigset; | |
3128 | sa.sa_flags = 0; | |
3129 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3130 | perror("sigaction"); | |
3131 | return ret; | |
d6f42150 DG |
3132 | } |
3133 | ||
1d4b027a DG |
3134 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3135 | perror("sigaction"); | |
3136 | return ret; | |
d6f42150 | 3137 | } |
aaf26714 | 3138 | |
1d4b027a DG |
3139 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3140 | perror("sigaction"); | |
3141 | return ret; | |
8c0faa1d DG |
3142 | } |
3143 | ||
1d4b027a DG |
3144 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3145 | ||
3146 | return ret; | |
fac6795d DG |
3147 | } |
3148 | ||
f3ed775e | 3149 | /* |
d063d709 DG |
3150 | * Set open files limit to unlimited. This daemon can open a large number of |
3151 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3152 | */ |
3153 | static void set_ulimit(void) | |
3154 | { | |
3155 | int ret; | |
3156 | struct rlimit lim; | |
3157 | ||
a88df331 | 3158 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3159 | lim.rlim_cur = 65535; |
3160 | lim.rlim_max = 65535; | |
3161 | ||
3162 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3163 | if (ret < 0) { | |
3164 | perror("failed to set open files limit"); | |
3165 | } | |
3166 | } | |
3167 | ||
fac6795d DG |
3168 | /* |
3169 | * main | |
3170 | */ | |
3171 | int main(int argc, char **argv) | |
3172 | { | |
fac6795d DG |
3173 | int ret = 0; |
3174 | void *status; | |
b082db07 | 3175 | const char *home_path; |
fac6795d | 3176 | |
b25a8868 DG |
3177 | tracepoint(sessiond_boot_start); |
3178 | ||
273ea72c | 3179 | /* Create thread quit pipe */ |
cf3af59e MD |
3180 | if ((ret = init_thread_quit_pipe()) < 0) { |
3181 | goto error; | |
273ea72c DG |
3182 | } |
3183 | ||
fac6795d DG |
3184 | /* Parse arguments */ |
3185 | progname = argv[0]; | |
3186 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3187 | goto error; |
fac6795d DG |
3188 | } |
3189 | ||
3190 | /* Daemonize */ | |
3191 | if (opt_daemon) { | |
53094c05 DG |
3192 | ret = daemon(0, 0); |
3193 | if (ret < 0) { | |
3194 | perror("daemon"); | |
cf3af59e | 3195 | goto error; |
53094c05 | 3196 | } |
fac6795d DG |
3197 | } |
3198 | ||
3199 | /* Check if daemon is UID = 0 */ | |
3200 | is_root = !getuid(); | |
3201 | ||
fac6795d | 3202 | if (is_root) { |
d6f42150 DG |
3203 | ret = create_lttng_rundir(); |
3204 | if (ret < 0) { | |
cf3af59e | 3205 | goto error; |
d6f42150 DG |
3206 | } |
3207 | ||
fac6795d | 3208 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3209 | snprintf(apps_unix_sock_path, PATH_MAX, |
3210 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3211 | } |
3212 | ||
3213 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3214 | snprintf(client_unix_sock_path, PATH_MAX, |
3215 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3216 | } | |
0fdd1e2c DG |
3217 | |
3218 | /* Set global SHM for ust */ | |
3219 | if (strlen(wait_shm_path) == 0) { | |
3220 | snprintf(wait_shm_path, PATH_MAX, | |
3221 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3222 | } | |
fac6795d | 3223 | } else { |
b082db07 DG |
3224 | home_path = get_home_dir(); |
3225 | if (home_path == NULL) { | |
273ea72c DG |
3226 | /* TODO: Add --socket PATH option */ |
3227 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3228 | ret = -EPERM; |
3229 | goto error; | |
b082db07 DG |
3230 | } |
3231 | ||
fac6795d | 3232 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3233 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3234 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3235 | } |
3236 | ||
3237 | /* Set the cli tool unix socket path */ | |
3238 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3239 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3240 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3241 | } |
0fdd1e2c DG |
3242 | |
3243 | /* Set global SHM for ust */ | |
3244 | if (strlen(wait_shm_path) == 0) { | |
3245 | snprintf(wait_shm_path, PATH_MAX, | |
3246 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3247 | } | |
fac6795d DG |
3248 | } |
3249 | ||
847177cd DG |
3250 | DBG("Client socket path %s", client_unix_sock_path); |
3251 | DBG("Application socket path %s", apps_unix_sock_path); | |
3252 | ||
273ea72c | 3253 | /* |
7d8234d9 | 3254 | * See if daemon already exist. |
fac6795d | 3255 | */ |
7d8234d9 | 3256 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3257 | ERR("Already running daemon.\n"); |
273ea72c | 3258 | /* |
cf3af59e MD |
3259 | * We do not goto exit because we must not cleanup() |
3260 | * because a daemon is already running. | |
ab118b20 | 3261 | */ |
cf3af59e | 3262 | goto error; |
a88df331 DG |
3263 | } |
3264 | ||
3265 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3266 | ||
3267 | /* | |
3268 | * These actions must be executed as root. We do that *after* setting up | |
3269 | * the sockets path because we MUST make the check for another daemon using | |
3270 | * those paths *before* trying to set the kernel consumer sockets and init | |
3271 | * kernel tracer. | |
3272 | */ | |
3273 | if (is_root) { | |
3274 | ret = set_kconsumerd_sockets(); | |
3275 | if (ret < 0) { | |
cf3af59e | 3276 | goto exit; |
a88df331 DG |
3277 | } |
3278 | ||
3279 | /* Setup kernel tracer */ | |
3280 | init_kernel_tracer(); | |
3281 | ||
3282 | /* Set ulimit for open files */ | |
3283 | set_ulimit(); | |
fac6795d DG |
3284 | } |
3285 | ||
cf3af59e MD |
3286 | if ((ret = set_signal_handler()) < 0) { |
3287 | goto exit; | |
fac6795d DG |
3288 | } |
3289 | ||
d6f42150 | 3290 | /* Setup the needed unix socket */ |
cf3af59e MD |
3291 | if ((ret = init_daemon_socket()) < 0) { |
3292 | goto exit; | |
fac6795d DG |
3293 | } |
3294 | ||
3295 | /* Set credentials to socket */ | |
cf3af59e MD |
3296 | if (is_root && ((ret = set_permissions()) < 0)) { |
3297 | goto exit; | |
fac6795d DG |
3298 | } |
3299 | ||
5b8719f5 DG |
3300 | /* Get parent pid if -S, --sig-parent is specified. */ |
3301 | if (opt_sig_parent) { | |
3302 | ppid = getppid(); | |
3303 | } | |
3304 | ||
7a485870 | 3305 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3306 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3307 | goto exit; | |
7a485870 DG |
3308 | } |
3309 | ||
099e26bd DG |
3310 | /* Setup the thread apps communication pipe. */ |
3311 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3312 | goto exit; | |
3313 | } | |
3314 | ||
3315 | /* Init UST command queue. */ | |
3316 | cds_wfq_init(&ust_cmd_queue.queue); | |
3317 | ||
273ea72c DG |
3318 | /* |
3319 | * Get session list pointer. This pointer MUST NOT be free(). | |
3320 | * This list is statically declared in session.c | |
3321 | */ | |
b5541356 DG |
3322 | session_list_ptr = get_session_list(); |
3323 | ||
cf3af59e | 3324 | /* Create thread to manage the client socket */ |
099e26bd DG |
3325 | ret = pthread_create(&client_thread, NULL, |
3326 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3327 | if (ret != 0) { |
099e26bd | 3328 | perror("pthread_create clients"); |
cf3af59e MD |
3329 | goto exit_client; |
3330 | } | |
fac6795d | 3331 | |
099e26bd DG |
3332 | /* Create thread to dispatch registration */ |
3333 | ret = pthread_create(&dispatch_thread, NULL, | |
3334 | thread_dispatch_ust_registration, (void *) NULL); | |
3335 | if (ret != 0) { | |
3336 | perror("pthread_create dispatch"); | |
3337 | goto exit_dispatch; | |
3338 | } | |
3339 | ||
3340 | /* Create thread to manage application registration. */ | |
3341 | ret = pthread_create(®_apps_thread, NULL, | |
3342 | thread_registration_apps, (void *) NULL); | |
3343 | if (ret != 0) { | |
3344 | perror("pthread_create registration"); | |
3345 | goto exit_reg_apps; | |
3346 | } | |
3347 | ||
cf3af59e MD |
3348 | /* Create thread to manage application socket */ |
3349 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3350 | if (ret != 0) { | |
099e26bd | 3351 | perror("pthread_create apps"); |
cf3af59e MD |
3352 | goto exit_apps; |
3353 | } | |
fac6795d | 3354 | |
cf3af59e MD |
3355 | /* Create kernel thread to manage kernel event */ |
3356 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3357 | if (ret != 0) { | |
099e26bd | 3358 | perror("pthread_create kernel"); |
cf3af59e MD |
3359 | goto exit_kernel; |
3360 | } | |
7a485870 | 3361 | |
b25a8868 DG |
3362 | tracepoint(sessiond_boot_end); |
3363 | ||
cf3af59e MD |
3364 | ret = pthread_join(kernel_thread, &status); |
3365 | if (ret != 0) { | |
3366 | perror("pthread_join"); | |
3367 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3368 | } |
3369 | ||
cf3af59e MD |
3370 | exit_kernel: |
3371 | ret = pthread_join(apps_thread, &status); | |
3372 | if (ret != 0) { | |
3373 | perror("pthread_join"); | |
3374 | goto error; /* join error, exit without cleanup */ | |
3375 | } | |
fac6795d | 3376 | |
cf3af59e | 3377 | exit_apps: |
099e26bd DG |
3378 | ret = pthread_join(reg_apps_thread, &status); |
3379 | if (ret != 0) { | |
3380 | perror("pthread_join"); | |
3381 | goto error; /* join error, exit without cleanup */ | |
3382 | } | |
3383 | ||
3384 | exit_reg_apps: | |
3385 | ret = pthread_join(dispatch_thread, &status); | |
3386 | if (ret != 0) { | |
3387 | perror("pthread_join"); | |
3388 | goto error; /* join error, exit without cleanup */ | |
3389 | } | |
3390 | ||
3391 | exit_dispatch: | |
cf3af59e MD |
3392 | ret = pthread_join(client_thread, &status); |
3393 | if (ret != 0) { | |
3394 | perror("pthread_join"); | |
3395 | goto error; /* join error, exit without cleanup */ | |
3396 | } | |
3397 | ||
3398 | ret = join_kconsumerd_thread(); | |
3399 | if (ret != 0) { | |
3400 | perror("join_kconsumerd"); | |
3401 | goto error; /* join error, exit without cleanup */ | |
3402 | } | |
a88df331 | 3403 | |
cf3af59e | 3404 | exit_client: |
a88df331 | 3405 | exit: |
cf3af59e MD |
3406 | /* |
3407 | * cleanup() is called when no other thread is running. | |
3408 | */ | |
3409 | cleanup(); | |
3410 | if (!ret) | |
3411 | exit(EXIT_SUCCESS); | |
3412 | error: | |
5e16da05 | 3413 | exit(EXIT_FAILURE); |
fac6795d | 3414 | } |