Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
20fe2104 | 53 | #include "kernel-ctl.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 80 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d DG |
92 | static int opt_daemon; |
93 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
99 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
100 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 101 | }; |
7753dea8 MD |
102 | static struct consumer_data ustconsumer64_data = { |
103 | .type = LTTNG_CONSUMER64_UST, | |
104 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
105 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
106 | }; | |
107 | static struct consumer_data ustconsumer32_data = { | |
108 | .type = LTTNG_CONSUMER32_UST, | |
109 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
110 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
111 | }; |
112 | ||
099e26bd | 113 | static int dispatch_thread_exit; |
fac6795d | 114 | |
54d01ffb DG |
115 | /* Global application Unix socket path */ |
116 | static char apps_unix_sock_path[PATH_MAX]; | |
117 | /* Global client Unix socket path */ | |
118 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
119 | /* global wait shm path for UST */ |
120 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 121 | |
1d4b027a | 122 | /* Sockets and FDs */ |
d6f42150 DG |
123 | static int client_sock; |
124 | static int apps_sock; | |
20fe2104 | 125 | static int kernel_tracer_fd; |
7a485870 | 126 | static int kernel_poll_pipe[2]; |
1d4b027a | 127 | |
273ea72c DG |
128 | /* |
129 | * Quit pipe for all threads. This permits a single cancellation point | |
130 | * for all threads when receiving an event on the pipe. | |
131 | */ | |
132 | static int thread_quit_pipe[2]; | |
133 | ||
099e26bd DG |
134 | /* |
135 | * This pipe is used to inform the thread managing application communication | |
136 | * that a command is queued and ready to be processed. | |
137 | */ | |
138 | static int apps_cmd_pipe[2]; | |
139 | ||
1d4b027a | 140 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 141 | static pthread_t apps_thread; |
099e26bd | 142 | static pthread_t reg_apps_thread; |
1d4b027a | 143 | static pthread_t client_thread; |
7a485870 | 144 | static pthread_t kernel_thread; |
099e26bd | 145 | static pthread_t dispatch_thread; |
5eb91c98 | 146 | |
fac6795d | 147 | |
099e26bd DG |
148 | /* |
149 | * UST registration command queue. This queue is tied with a futex and uses a N | |
150 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
151 | * | |
152 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
153 | * this queue and the wait/wake scheme. | |
154 | */ | |
155 | static struct ust_cmd_queue ust_cmd_queue; | |
156 | ||
b5541356 DG |
157 | /* |
158 | * Pointer initialized before thread creation. | |
159 | * | |
160 | * This points to the tracing session list containing the session count and a | |
161 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
162 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 163 | * |
d063d709 | 164 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 165 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
166 | */ |
167 | static struct ltt_session_list *session_list_ptr; | |
168 | ||
7753dea8 MD |
169 | int ust_consumerd64_fd = -1; |
170 | int ust_consumerd32_fd = -1; | |
171 | ||
172 | static const char *consumerd64_prog = "lttng-consumerd"; | |
173 | static const char *consumerd32_prog = "lttng-consumerd"; | |
ba5d816e | 174 | |
7753dea8 MD |
175 | static const char *consumerd64_bindir = |
176 | __stringify(CONFIG_64BIT_BINDIR); | |
177 | static const char *consumerd32_bindir = | |
178 | __stringify(CONFIG_32BIT_BINDIR); | |
fb09408a MD |
179 | |
180 | static | |
7753dea8 | 181 | void setup_consumerd_path(void) |
fb09408a MD |
182 | { |
183 | const char *bindir; | |
184 | ||
7753dea8 MD |
185 | /* |
186 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
187 | * native architecture size consumer if CONFIG_NBIT_BINDIR as | |
188 | * not been defined. | |
189 | */ | |
190 | #if (CAA_BITS_PER_LONG == 64) | |
191 | if (!consumerd64_bindir[0]) { | |
192 | consumerd64_bindir = INSTALL_BIN_PATH; | |
193 | } | |
194 | #elif (CAA_BITS_PER_LONG == 32) | |
195 | if (!consumerd32_bindir[0]) { | |
196 | consumerd32_bindir = INSTALL_BIN_PATH; | |
197 | } | |
198 | #else | |
199 | #error "Unknown bitness" | |
200 | #endif | |
201 | ||
fb09408a MD |
202 | /* |
203 | * runtime env. var. overrides the build default. | |
204 | */ | |
7753dea8 MD |
205 | bindir = getenv("LTTNG_TOOLS_64BIT_BINDIR"); |
206 | if (bindir) { | |
207 | consumerd64_bindir = bindir; | |
208 | } | |
209 | bindir = getenv("LTTNG_TOOLS_32BIT_BINDIR"); | |
fb09408a | 210 | if (bindir) { |
7753dea8 | 211 | consumerd32_bindir = bindir; |
fb09408a MD |
212 | } |
213 | } | |
214 | ||
5eb91c98 DG |
215 | /* |
216 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
217 | */ | |
218 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
219 | unsigned int size) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | if (events == NULL || size == 0) { | |
224 | ret = -1; | |
225 | goto error; | |
226 | } | |
227 | ||
228 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
229 | if (ret < 0) { | |
230 | goto error; | |
231 | } | |
232 | ||
233 | /* Add quit pipe */ | |
234 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
235 | if (ret < 0) { | |
236 | goto error; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | ||
241 | error: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Check if the thread quit pipe was triggered. | |
247 | * | |
248 | * Return 1 if it was triggered else 0; | |
249 | */ | |
250 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
251 | { | |
252 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
253 | return 1; | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
0fdd1e2c DG |
259 | /* |
260 | * Remove modules in reverse load order. | |
261 | */ | |
262 | static int modprobe_remove_kernel_modules(void) | |
263 | { | |
264 | int ret = 0, i; | |
265 | char modprobe[256]; | |
266 | ||
267 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
268 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 269 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
270 | kernel_modules_list[i].name); |
271 | if (ret < 0) { | |
24b487b8 | 272 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
273 | goto error; |
274 | } | |
275 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
276 | ret = system(modprobe); | |
277 | if (ret == -1) { | |
24b487b8 | 278 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
279 | kernel_modules_list[i].name); |
280 | } else if (kernel_modules_list[i].required | |
281 | && WEXITSTATUS(ret) != 0) { | |
282 | ERR("Unable to remove module %s", | |
283 | kernel_modules_list[i].name); | |
284 | } else { | |
285 | DBG("Modprobe removal successful %s", | |
286 | kernel_modules_list[i].name); | |
287 | } | |
288 | } | |
289 | ||
290 | error: | |
291 | return ret; | |
292 | } | |
293 | ||
294 | /* | |
295 | * Return group ID of the tracing group or -1 if not found. | |
296 | */ | |
996b65c8 MD |
297 | static gid_t allowed_group(void) |
298 | { | |
299 | struct group *grp; | |
300 | ||
274e143b MD |
301 | if (opt_tracing_group) { |
302 | grp = getgrnam(opt_tracing_group); | |
303 | } else { | |
304 | grp = getgrnam(default_tracing_group); | |
305 | } | |
996b65c8 MD |
306 | if (!grp) { |
307 | return -1; | |
308 | } else { | |
309 | return grp->gr_gid; | |
310 | } | |
311 | } | |
312 | ||
273ea72c | 313 | /* |
5eb91c98 | 314 | * Init thread quit pipe. |
273ea72c DG |
315 | * |
316 | * Return -1 on error or 0 if all pipes are created. | |
317 | */ | |
318 | static int init_thread_quit_pipe(void) | |
319 | { | |
320 | int ret; | |
321 | ||
322 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
323 | if (ret < 0) { | |
324 | perror("thread quit pipe"); | |
325 | goto error; | |
326 | } | |
327 | ||
328 | error: | |
329 | return ret; | |
330 | } | |
331 | ||
fac6795d | 332 | /* |
d063d709 DG |
333 | * Complete teardown of a kernel session. This free all data structure related |
334 | * to a kernel session and update counter. | |
fac6795d | 335 | */ |
1d4b027a | 336 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 337 | { |
1d4b027a DG |
338 | if (session->kernel_session != NULL) { |
339 | DBG("Tearing down kernel session"); | |
d9800920 DG |
340 | |
341 | /* | |
342 | * If a custom kernel consumer was registered, close the socket before | |
343 | * tearing down the complete kernel session structure | |
344 | */ | |
3bd1e081 | 345 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { |
d9800920 DG |
346 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
347 | } | |
348 | ||
62499ad6 | 349 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
350 | /* Extra precaution */ |
351 | session->kernel_session = NULL; | |
fac6795d | 352 | } |
fac6795d DG |
353 | } |
354 | ||
f6a9efaa DG |
355 | /* |
356 | * Complete teardown of all UST sessions. This will free everything on his path | |
357 | * and destroy the core essence of all ust sessions :) | |
358 | */ | |
359 | static void teardown_ust_session(struct ltt_session *session) | |
360 | { | |
84cd17c6 MD |
361 | int ret; |
362 | ||
f6a9efaa DG |
363 | DBG("Tearing down UST session(s)"); |
364 | ||
84cd17c6 MD |
365 | ret = ust_app_destroy_trace_all(session->ust_session); |
366 | if (ret) { | |
367 | ERR("Error in ust_app_destroy_trace_all"); | |
368 | } | |
f6a9efaa DG |
369 | trace_ust_destroy_session(session->ust_session); |
370 | } | |
371 | ||
099e26bd DG |
372 | /* |
373 | * Stop all threads by closing the thread quit pipe. | |
374 | */ | |
cf3af59e MD |
375 | static void stop_threads(void) |
376 | { | |
5eb91c98 DG |
377 | int ret; |
378 | ||
cf3af59e MD |
379 | /* Stopping all threads */ |
380 | DBG("Terminating all threads"); | |
54d01ffb | 381 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
382 | if (ret < 0) { |
383 | ERR("write error on thread quit pipe"); | |
384 | } | |
385 | ||
099e26bd DG |
386 | /* Dispatch thread */ |
387 | dispatch_thread_exit = 1; | |
388 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
389 | } |
390 | ||
fac6795d | 391 | /* |
d063d709 | 392 | * Cleanup the daemon |
fac6795d | 393 | */ |
cf3af59e | 394 | static void cleanup(void) |
fac6795d | 395 | { |
1d4b027a DG |
396 | int ret; |
397 | char *cmd; | |
af9737e9 | 398 | struct ltt_session *sess, *stmp; |
fac6795d | 399 | |
1d4b027a | 400 | DBG("Cleaning up"); |
e07ae692 | 401 | |
5eb91c98 DG |
402 | if (is_root) { |
403 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
404 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
405 | if (ret < 0) { | |
406 | ERR("asprintf failed. Something is really wrong!"); | |
407 | } | |
5461b305 | 408 | |
5eb91c98 DG |
409 | /* Remove lttng run directory */ |
410 | ret = system(cmd); | |
411 | if (ret < 0) { | |
412 | ERR("Unable to clean " LTTNG_RUNDIR); | |
413 | } | |
1d4b027a | 414 | } |
5461b305 | 415 | |
1d4b027a | 416 | DBG("Cleaning up all session"); |
fac6795d | 417 | |
b5541356 | 418 | /* Destroy session list mutex */ |
273ea72c DG |
419 | if (session_list_ptr != NULL) { |
420 | pthread_mutex_destroy(&session_list_ptr->lock); | |
421 | ||
422 | /* Cleanup ALL session */ | |
54d01ffb DG |
423 | cds_list_for_each_entry_safe(sess, stmp, |
424 | &session_list_ptr->head, list) { | |
273ea72c | 425 | teardown_kernel_session(sess); |
f6a9efaa DG |
426 | teardown_ust_session(sess); |
427 | free(sess); | |
273ea72c DG |
428 | } |
429 | } | |
430 | ||
099e26bd | 431 | DBG("Closing all UST sockets"); |
56fff090 | 432 | ust_app_clean_list(); |
099e26bd | 433 | |
3bd1e081 | 434 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 435 | |
f3ed775e | 436 | DBG("Closing kernel fd"); |
1d4b027a | 437 | close(kernel_tracer_fd); |
ab147185 | 438 | |
2f50c8a3 DG |
439 | if (is_root) { |
440 | DBG("Unloading kernel modules"); | |
441 | modprobe_remove_kernel_modules(); | |
442 | } | |
5eb91c98 DG |
443 | |
444 | close(thread_quit_pipe[0]); | |
445 | close(thread_quit_pipe[1]); | |
421cb601 DG |
446 | |
447 | /* <fun> */ | |
448 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
449 | "Matthew, BEET driven development works!%c[%dm", | |
450 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
451 | /* </fun> */ | |
fac6795d DG |
452 | } |
453 | ||
e065084a | 454 | /* |
d063d709 | 455 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 456 | * |
d063d709 | 457 | * Return lttcomm error code. |
e065084a DG |
458 | */ |
459 | static int send_unix_sock(int sock, void *buf, size_t len) | |
460 | { | |
461 | /* Check valid length */ | |
462 | if (len <= 0) { | |
463 | return -1; | |
464 | } | |
465 | ||
466 | return lttcomm_send_unix_sock(sock, buf, len); | |
467 | } | |
468 | ||
5461b305 | 469 | /* |
d063d709 | 470 | * Free memory of a command context structure. |
5461b305 | 471 | */ |
a2fb29a5 | 472 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 473 | { |
a2fb29a5 DG |
474 | DBG("Clean command context structure"); |
475 | if (*cmd_ctx) { | |
476 | if ((*cmd_ctx)->llm) { | |
477 | free((*cmd_ctx)->llm); | |
5461b305 | 478 | } |
a2fb29a5 DG |
479 | if ((*cmd_ctx)->lsm) { |
480 | free((*cmd_ctx)->lsm); | |
5461b305 | 481 | } |
a2fb29a5 DG |
482 | free(*cmd_ctx); |
483 | *cmd_ctx = NULL; | |
5461b305 DG |
484 | } |
485 | } | |
486 | ||
f3ed775e | 487 | /* |
d063d709 | 488 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 489 | */ |
2bdd86d4 | 490 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 491 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
492 | { |
493 | int ret; | |
f3ed775e | 494 | struct ltt_kernel_stream *stream; |
3bd1e081 | 495 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 496 | |
3bd1e081 | 497 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 498 | channel->channel->name); |
f3ed775e | 499 | |
3bd1e081 MD |
500 | /* Send channel */ |
501 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
502 | lkm.u.channel.channel_key = channel->fd; | |
503 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
504 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 505 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 506 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 507 | if (ret < 0) { |
3bd1e081 | 508 | perror("send consumer channel"); |
f3ed775e DG |
509 | goto error; |
510 | } | |
511 | ||
3bd1e081 | 512 | /* Send streams */ |
7a485870 | 513 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
514 | if (!stream->fd) { |
515 | continue; | |
516 | } | |
517 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
518 | lkm.u.stream.channel_key = channel->fd; | |
519 | lkm.u.stream.stream_key = stream->fd; | |
520 | lkm.u.stream.state = stream->state; | |
521 | lkm.u.stream.output = channel->channel->attr.output; | |
522 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
523 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
524 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
525 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
526 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
527 | if (ret < 0) { | |
528 | perror("send consumer stream"); | |
529 | goto error; | |
530 | } | |
531 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
532 | if (ret < 0) { | |
533 | perror("send consumer stream ancillary data"); | |
534 | goto error; | |
f3ed775e DG |
535 | } |
536 | } | |
537 | ||
3bd1e081 | 538 | DBG("consumer channel streams sent"); |
f3ed775e DG |
539 | |
540 | return 0; | |
541 | ||
542 | error: | |
543 | return ret; | |
544 | } | |
545 | ||
546 | /* | |
d063d709 | 547 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 548 | */ |
2bdd86d4 | 549 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 550 | struct ltt_kernel_session *session) |
f3ed775e DG |
551 | { |
552 | int ret; | |
553 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
554 | struct lttcomm_consumer_msg lkm; |
555 | int sock = session->consumer_fd; | |
7a485870 DG |
556 | |
557 | DBG("Sending metadata stream fd"); | |
558 | ||
2bdd86d4 | 559 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 560 | if (session->consumer_fd == 0) { |
3bd1e081 | 561 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
562 | } |
563 | ||
7a485870 | 564 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
565 | /* Send metadata channel fd */ |
566 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
567 | lkm.u.channel.channel_key = session->metadata->fd; | |
568 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
569 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
570 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
571 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
572 | if (ret < 0) { | |
573 | perror("send consumer channel"); | |
574 | goto error; | |
575 | } | |
576 | ||
577 | /* Send metadata stream fd */ | |
578 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
579 | lkm.u.stream.channel_key = session->metadata->fd; | |
580 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
581 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
582 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
583 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
584 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
585 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
586 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
587 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
588 | if (ret < 0) { | |
589 | perror("send consumer stream"); | |
590 | goto error; | |
591 | } | |
592 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 593 | if (ret < 0) { |
3bd1e081 | 594 | perror("send consumer stream"); |
7a485870 DG |
595 | goto error; |
596 | } | |
597 | } | |
f3ed775e | 598 | |
f3ed775e | 599 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
600 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
601 | if (ret < 0) { | |
602 | goto error; | |
603 | } | |
604 | } | |
605 | ||
606 | DBG("consumer fds (metadata and channel streams) sent"); | |
607 | ||
608 | return 0; | |
609 | ||
610 | error: | |
611 | return ret; | |
612 | } | |
613 | ||
fac6795d | 614 | /* |
0fdd1e2c | 615 | * Notify UST applications using the shm mmap futex. |
fac6795d | 616 | */ |
0fdd1e2c | 617 | static int notify_ust_apps(int active) |
fac6795d | 618 | { |
0fdd1e2c | 619 | char *wait_shm_mmap; |
fac6795d | 620 | |
0fdd1e2c | 621 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 622 | |
0fdd1e2c DG |
623 | /* See shm.c for this call implying mmap, shm and futex calls */ |
624 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
625 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
626 | goto error; |
627 | } | |
628 | ||
0fdd1e2c DG |
629 | /* Wake waiting process */ |
630 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
631 | ||
632 | /* Apps notified successfully */ | |
633 | return 0; | |
fac6795d DG |
634 | |
635 | error: | |
0fdd1e2c | 636 | return -1; |
fac6795d DG |
637 | } |
638 | ||
e065084a | 639 | /* |
d063d709 DG |
640 | * Setup the outgoing data buffer for the response (llm) by allocating the |
641 | * right amount of memory and copying the original information from the lsm | |
642 | * structure. | |
ca95a216 | 643 | * |
d063d709 | 644 | * Return total size of the buffer pointed by buf. |
ca95a216 | 645 | */ |
5461b305 | 646 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 647 | { |
f3ed775e | 648 | int ret, buf_size; |
ca95a216 | 649 | |
f3ed775e | 650 | buf_size = size; |
5461b305 | 651 | |
ba7f0ae5 | 652 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 653 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 654 | perror("zmalloc"); |
5461b305 | 655 | ret = -ENOMEM; |
ca95a216 DG |
656 | goto error; |
657 | } | |
658 | ||
5461b305 DG |
659 | /* Copy common data */ |
660 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 661 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 662 | |
5461b305 DG |
663 | cmd_ctx->llm->data_size = size; |
664 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
665 | ||
ca95a216 DG |
666 | return buf_size; |
667 | ||
668 | error: | |
669 | return ret; | |
670 | } | |
671 | ||
7a485870 | 672 | /* |
5eb91c98 | 673 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 674 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 675 | */ |
5eb91c98 | 676 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 677 | { |
5eb91c98 | 678 | int ret; |
7a485870 DG |
679 | struct ltt_session *session; |
680 | struct ltt_kernel_channel *channel; | |
681 | ||
5eb91c98 | 682 | DBG("Updating kernel poll set"); |
7a485870 | 683 | |
54d01ffb | 684 | session_lock_list(); |
b5541356 | 685 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 686 | session_lock(session); |
7a485870 | 687 | if (session->kernel_session == NULL) { |
54d01ffb | 688 | session_unlock(session); |
7a485870 DG |
689 | continue; |
690 | } | |
7a485870 | 691 | |
54d01ffb DG |
692 | cds_list_for_each_entry(channel, |
693 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
694 | /* Add channel fd to the kernel poll set */ |
695 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
696 | if (ret < 0) { | |
54d01ffb | 697 | session_unlock(session); |
5eb91c98 DG |
698 | goto error; |
699 | } | |
700 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 701 | } |
54d01ffb | 702 | session_unlock(session); |
7a485870 | 703 | } |
54d01ffb | 704 | session_unlock_list(); |
7a485870 | 705 | |
5eb91c98 | 706 | return 0; |
7a485870 DG |
707 | |
708 | error: | |
54d01ffb | 709 | session_unlock_list(); |
7a485870 DG |
710 | return -1; |
711 | } | |
712 | ||
713 | /* | |
54d01ffb | 714 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 715 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 716 | * |
d063d709 | 717 | * Useful for CPU hotplug feature. |
7a485870 | 718 | */ |
2bdd86d4 | 719 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
720 | { |
721 | int ret = 0; | |
722 | struct ltt_session *session; | |
723 | struct ltt_kernel_channel *channel; | |
724 | ||
725 | DBG("Updating kernel streams for channel fd %d", fd); | |
726 | ||
54d01ffb | 727 | session_lock_list(); |
b5541356 | 728 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 729 | session_lock(session); |
7a485870 | 730 | if (session->kernel_session == NULL) { |
54d01ffb | 731 | session_unlock(session); |
7a485870 DG |
732 | continue; |
733 | } | |
d9800920 DG |
734 | |
735 | /* This is not suppose to be 0 but this is an extra security check */ | |
736 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 737 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
738 | } |
739 | ||
5eb91c98 DG |
740 | cds_list_for_each_entry(channel, |
741 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
742 | if (channel->fd == fd) { |
743 | DBG("Channel found, updating kernel streams"); | |
744 | ret = kernel_open_channel_stream(channel); | |
745 | if (ret < 0) { | |
b3c750d2 | 746 | goto error; |
7a485870 | 747 | } |
d9800920 | 748 | |
7a485870 | 749 | /* |
5eb91c98 DG |
750 | * Have we already sent fds to the consumer? If yes, it means |
751 | * that tracing is started so it is safe to send our updated | |
752 | * stream fds. | |
7a485870 | 753 | */ |
3bd1e081 | 754 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 755 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 756 | session->kernel_session->consumer_fd, channel); |
7a485870 | 757 | if (ret < 0) { |
b3c750d2 | 758 | goto error; |
7a485870 DG |
759 | } |
760 | } | |
b3c750d2 | 761 | goto error; |
7a485870 DG |
762 | } |
763 | } | |
54d01ffb | 764 | session_unlock(session); |
7a485870 | 765 | } |
54d01ffb | 766 | session_unlock_list(); |
b3c750d2 | 767 | return ret; |
7a485870 | 768 | |
b3c750d2 | 769 | error: |
54d01ffb DG |
770 | session_unlock(session); |
771 | session_unlock_list(); | |
7a485870 DG |
772 | return ret; |
773 | } | |
774 | ||
487cf67c DG |
775 | /* |
776 | * For each tracing session, update newly registered apps. | |
777 | */ | |
778 | static void update_ust_app(int app_sock) | |
779 | { | |
780 | struct ltt_session *sess, *stmp; | |
781 | ||
782 | /* For all tracing session(s) */ | |
783 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
784 | if (sess->ust_session) { |
785 | ust_app_global_update(sess->ust_session, app_sock); | |
786 | } | |
487cf67c DG |
787 | } |
788 | } | |
789 | ||
7a485870 | 790 | /* |
d063d709 | 791 | * This thread manage event coming from the kernel. |
7a485870 | 792 | * |
d063d709 DG |
793 | * Features supported in this thread: |
794 | * -) CPU Hotplug | |
7a485870 DG |
795 | */ |
796 | static void *thread_manage_kernel(void *data) | |
797 | { | |
5eb91c98 DG |
798 | int ret, i, pollfd, update_poll_flag = 1; |
799 | uint32_t revents, nb_fd; | |
7a485870 | 800 | char tmp; |
5eb91c98 | 801 | struct lttng_poll_event events; |
7a485870 DG |
802 | |
803 | DBG("Thread manage kernel started"); | |
804 | ||
5eb91c98 DG |
805 | ret = create_thread_poll_set(&events, 2); |
806 | if (ret < 0) { | |
807 | goto error; | |
808 | } | |
809 | ||
810 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
811 | if (ret < 0) { | |
812 | goto error; | |
813 | } | |
814 | ||
7a485870 DG |
815 | while (1) { |
816 | if (update_poll_flag == 1) { | |
5f822d0a DG |
817 | /* |
818 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
819 | * quit pipe and the kernel pipe. | |
820 | */ | |
821 | events.nb_fd = 2; | |
822 | ||
5eb91c98 DG |
823 | ret = update_kernel_poll(&events); |
824 | if (ret < 0) { | |
7a485870 DG |
825 | goto error; |
826 | } | |
827 | update_poll_flag = 0; | |
828 | } | |
829 | ||
5eb91c98 DG |
830 | nb_fd = LTTNG_POLL_GETNB(&events); |
831 | ||
832 | DBG("Thread kernel polling on %d fds", nb_fd); | |
833 | ||
834 | /* Zeroed the poll events */ | |
835 | lttng_poll_reset(&events); | |
7a485870 DG |
836 | |
837 | /* Poll infinite value of time */ | |
5eb91c98 | 838 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 839 | if (ret < 0) { |
7a485870 DG |
840 | goto error; |
841 | } else if (ret == 0) { | |
842 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
843 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
844 | "This should not have happened! Continuing..."); | |
7a485870 DG |
845 | continue; |
846 | } | |
847 | ||
5eb91c98 DG |
848 | for (i = 0; i < nb_fd; i++) { |
849 | /* Fetch once the poll data */ | |
850 | revents = LTTNG_POLL_GETEV(&events, i); | |
851 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 852 | |
5eb91c98 DG |
853 | /* Thread quit pipe has been closed. Killing thread. */ |
854 | ret = check_thread_quit_pipe(pollfd, revents); | |
855 | if (ret) { | |
856 | goto error; | |
857 | } | |
7a485870 | 858 | |
5eb91c98 DG |
859 | /* Check for data on kernel pipe */ |
860 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
861 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
862 | update_poll_flag = 1; | |
863 | continue; | |
864 | } else { | |
865 | /* | |
866 | * New CPU detected by the kernel. Adding kernel stream to | |
867 | * kernel session and updating the kernel consumer | |
868 | */ | |
869 | if (revents & LPOLLIN) { | |
2bdd86d4 | 870 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
871 | if (ret < 0) { |
872 | continue; | |
873 | } | |
874 | break; | |
875 | /* | |
876 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
877 | * and unregister kernel stream at this point. | |
878 | */ | |
7a485870 | 879 | } |
7a485870 DG |
880 | } |
881 | } | |
882 | } | |
883 | ||
884 | error: | |
885 | DBG("Kernel thread dying"); | |
273ea72c DG |
886 | close(kernel_poll_pipe[0]); |
887 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
888 | |
889 | lttng_poll_clean(&events); | |
890 | ||
7a485870 DG |
891 | return NULL; |
892 | } | |
893 | ||
1d4b027a | 894 | /* |
3bd1e081 | 895 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 896 | */ |
3bd1e081 | 897 | static void *thread_manage_consumer(void *data) |
1d4b027a | 898 | { |
5eb91c98 DG |
899 | int sock = 0, i, ret, pollfd; |
900 | uint32_t revents, nb_fd; | |
1d4b027a | 901 | enum lttcomm_return_code code; |
5eb91c98 | 902 | struct lttng_poll_event events; |
3bd1e081 | 903 | struct consumer_data *consumer_data = data; |
1d4b027a | 904 | |
3bd1e081 | 905 | DBG("[thread] Manage consumer started"); |
1d4b027a | 906 | |
3bd1e081 | 907 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
908 | if (ret < 0) { |
909 | goto error; | |
910 | } | |
911 | ||
5eb91c98 DG |
912 | /* |
913 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
914 | * Nothing more will be added to this poll set. | |
915 | */ | |
916 | ret = create_thread_poll_set(&events, 2); | |
917 | if (ret < 0) { | |
918 | goto error; | |
919 | } | |
273ea72c | 920 | |
3bd1e081 | 921 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
922 | if (ret < 0) { |
923 | goto error; | |
924 | } | |
925 | ||
926 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
927 | |
928 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 929 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 930 | if (ret < 0) { |
273ea72c DG |
931 | goto error; |
932 | } | |
933 | ||
5eb91c98 DG |
934 | for (i = 0; i < nb_fd; i++) { |
935 | /* Fetch once the poll data */ | |
936 | revents = LTTNG_POLL_GETEV(&events, i); | |
937 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
938 | ||
939 | /* Thread quit pipe has been closed. Killing thread. */ | |
940 | ret = check_thread_quit_pipe(pollfd, revents); | |
941 | if (ret) { | |
942 | goto error; | |
943 | } | |
944 | ||
945 | /* Event on the registration socket */ | |
3bd1e081 | 946 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 947 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 948 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
949 | goto error; |
950 | } | |
951 | } | |
273ea72c DG |
952 | } |
953 | ||
3bd1e081 | 954 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
955 | if (sock < 0) { |
956 | goto error; | |
957 | } | |
958 | ||
3bd1e081 | 959 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 960 | |
712ea556 | 961 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
962 | ret = lttcomm_recv_unix_sock(sock, &code, |
963 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
964 | if (ret <= 0) { |
965 | goto error; | |
966 | } | |
967 | ||
3bd1e081 MD |
968 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
969 | consumer_data->cmd_sock = | |
970 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
971 | if (consumer_data->cmd_sock < 0) { | |
972 | sem_post(&consumer_data->sem); | |
48842b30 | 973 | PERROR("consumer connect"); |
1d4b027a DG |
974 | goto error; |
975 | } | |
976 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
977 | sem_post(&consumer_data->sem); |
978 | DBG("consumer command socket ready"); | |
1d4b027a | 979 | } else { |
3bd1e081 | 980 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
981 | lttcomm_get_readable_code(-code)); |
982 | goto error; | |
983 | } | |
984 | ||
54d01ffb | 985 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 986 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 987 | if (ret < 0) { |
72079cae DG |
988 | goto error; |
989 | } | |
990 | ||
5eb91c98 DG |
991 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
992 | if (ret < 0) { | |
72079cae | 993 | goto error; |
5eb91c98 DG |
994 | } |
995 | ||
996 | /* Update number of fd */ | |
997 | nb_fd = LTTNG_POLL_GETNB(&events); | |
998 | ||
999 | /* Inifinite blocking call, waiting for transmission */ | |
1000 | ret = lttng_poll_wait(&events, -1); | |
1001 | if (ret < 0) { | |
72079cae DG |
1002 | goto error; |
1003 | } | |
1004 | ||
5eb91c98 DG |
1005 | for (i = 0; i < nb_fd; i++) { |
1006 | /* Fetch once the poll data */ | |
1007 | revents = LTTNG_POLL_GETEV(&events, i); | |
1008 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1009 | ||
1010 | /* Thread quit pipe has been closed. Killing thread. */ | |
1011 | ret = check_thread_quit_pipe(pollfd, revents); | |
1012 | if (ret) { | |
1013 | goto error; | |
1014 | } | |
1015 | ||
1016 | /* Event on the kconsumerd socket */ | |
1017 | if (pollfd == sock) { | |
1018 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1019 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1020 | goto error; |
1021 | } | |
1022 | } | |
1023 | } | |
1024 | ||
712ea556 | 1025 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1026 | ret = lttcomm_recv_unix_sock(sock, &code, |
1027 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1028 | if (ret <= 0) { |
3bd1e081 | 1029 | ERR("consumer closed the command socket"); |
712ea556 | 1030 | goto error; |
6f61d021 | 1031 | } |
1d4b027a | 1032 | |
3bd1e081 | 1033 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1034 | |
1d4b027a | 1035 | error: |
3bd1e081 MD |
1036 | DBG("consumer thread dying"); |
1037 | close(consumer_data->err_sock); | |
1038 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1039 | close(sock); |
273ea72c | 1040 | |
3bd1e081 MD |
1041 | unlink(consumer_data->err_unix_sock_path); |
1042 | unlink(consumer_data->cmd_unix_sock_path); | |
1043 | consumer_data->pid = 0; | |
1d4b027a | 1044 | |
5eb91c98 | 1045 | lttng_poll_clean(&events); |
0177d773 | 1046 | |
5eb91c98 | 1047 | return NULL; |
099e26bd DG |
1048 | } |
1049 | ||
099e26bd DG |
1050 | /* |
1051 | * This thread manage application communication. | |
1d4b027a DG |
1052 | */ |
1053 | static void *thread_manage_apps(void *data) | |
099e26bd | 1054 | { |
5eb91c98 DG |
1055 | int i, ret, pollfd; |
1056 | uint32_t revents, nb_fd; | |
099e26bd | 1057 | struct ust_command ust_cmd; |
5eb91c98 | 1058 | struct lttng_poll_event events; |
099e26bd DG |
1059 | |
1060 | DBG("[thread] Manage application started"); | |
1061 | ||
f6a9efaa DG |
1062 | rcu_register_thread(); |
1063 | rcu_thread_online(); | |
1064 | ||
5eb91c98 DG |
1065 | ret = create_thread_poll_set(&events, 2); |
1066 | if (ret < 0) { | |
1067 | goto error; | |
1068 | } | |
099e26bd | 1069 | |
5eb91c98 DG |
1070 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1071 | if (ret < 0) { | |
1072 | goto error; | |
1073 | } | |
099e26bd | 1074 | |
5eb91c98 DG |
1075 | while (1) { |
1076 | /* Zeroed the events structure */ | |
1077 | lttng_poll_reset(&events); | |
0177d773 | 1078 | |
5eb91c98 | 1079 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1080 | |
1081 | DBG("Apps thread polling on %d fds", nb_fd); | |
1082 | ||
1083 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1084 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1085 | if (ret < 0) { |
099e26bd DG |
1086 | goto error; |
1087 | } | |
1088 | ||
5eb91c98 DG |
1089 | for (i = 0; i < nb_fd; i++) { |
1090 | /* Fetch once the poll data */ | |
1091 | revents = LTTNG_POLL_GETEV(&events, i); | |
1092 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1093 | ||
1094 | /* Thread quit pipe has been closed. Killing thread. */ | |
1095 | ret = check_thread_quit_pipe(pollfd, revents); | |
1096 | if (ret) { | |
099e26bd | 1097 | goto error; |
5eb91c98 | 1098 | } |
099e26bd | 1099 | |
5eb91c98 DG |
1100 | /* Inspect the apps cmd pipe */ |
1101 | if (pollfd == apps_cmd_pipe[0]) { | |
1102 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1103 | ERR("Apps command pipe error"); | |
0177d773 | 1104 | goto error; |
5eb91c98 DG |
1105 | } else if (revents & LPOLLIN) { |
1106 | /* Empty pipe */ | |
1107 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1108 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1109 | perror("read apps cmd pipe"); | |
1110 | goto error; | |
1111 | } | |
099e26bd | 1112 | |
5eb91c98 | 1113 | /* Register applicaton to the session daemon */ |
56fff090 | 1114 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1115 | ust_cmd.sock); |
88ff5b7f | 1116 | if (ret == -ENOMEM) { |
5eb91c98 | 1117 | goto error; |
88ff5b7f MD |
1118 | } else if (ret < 0) { |
1119 | break; | |
5eb91c98 DG |
1120 | } |
1121 | ||
acc7b41b MD |
1122 | /* |
1123 | * Add channel(s) and event(s) to newly registered apps | |
1124 | * from lttng global UST domain. | |
1125 | */ | |
1126 | update_ust_app(ust_cmd.sock); | |
1127 | ||
5eb91c98 DG |
1128 | ret = ustctl_register_done(ust_cmd.sock); |
1129 | if (ret < 0) { | |
1130 | /* | |
1131 | * If the registration is not possible, we simply | |
1132 | * unregister the apps and continue | |
1133 | */ | |
56fff090 | 1134 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1135 | } else { |
1136 | /* | |
1137 | * We just need here to monitor the close of the UST | |
1138 | * socket and poll set monitor those by default. | |
1139 | */ | |
1140 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1141 | if (ret < 0) { | |
1142 | goto error; | |
1143 | } | |
1144 | ||
54d01ffb DG |
1145 | DBG("Apps with sock %d added to poll set", |
1146 | ust_cmd.sock); | |
5eb91c98 | 1147 | } |
487cf67c | 1148 | |
5eb91c98 | 1149 | break; |
0177d773 | 1150 | } |
5eb91c98 DG |
1151 | } else { |
1152 | /* | |
54d01ffb DG |
1153 | * At this point, we know that a registered application made |
1154 | * the event at poll_wait. | |
5eb91c98 DG |
1155 | */ |
1156 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1157 | /* Removing from the poll set */ | |
1158 | ret = lttng_poll_del(&events, pollfd); | |
1159 | if (ret < 0) { | |
1160 | goto error; | |
1161 | } | |
099e26bd | 1162 | |
b9d9b220 | 1163 | /* Socket closed on remote end. */ |
56fff090 | 1164 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1165 | break; |
1166 | } | |
099e26bd DG |
1167 | } |
1168 | } | |
099e26bd DG |
1169 | } |
1170 | ||
1171 | error: | |
1172 | DBG("Application communication apps dying"); | |
1173 | close(apps_cmd_pipe[0]); | |
1174 | close(apps_cmd_pipe[1]); | |
1175 | ||
5eb91c98 | 1176 | lttng_poll_clean(&events); |
099e26bd | 1177 | |
f6a9efaa DG |
1178 | rcu_thread_offline(); |
1179 | rcu_unregister_thread(); | |
099e26bd DG |
1180 | return NULL; |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Dispatch request from the registration threads to the application | |
1185 | * communication thread. | |
1186 | */ | |
1187 | static void *thread_dispatch_ust_registration(void *data) | |
1188 | { | |
1189 | int ret; | |
1190 | struct cds_wfq_node *node; | |
1191 | struct ust_command *ust_cmd = NULL; | |
1192 | ||
1193 | DBG("[thread] Dispatch UST command started"); | |
1194 | ||
1195 | while (!dispatch_thread_exit) { | |
1196 | /* Atomically prepare the queue futex */ | |
1197 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1198 | ||
1199 | do { | |
1200 | /* Dequeue command for registration */ | |
1201 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1202 | if (node == NULL) { | |
00a17c97 | 1203 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1204 | /* Continue thread execution */ |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1209 | ||
2f50c8a3 DG |
1210 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1211 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1212 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1213 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1214 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1215 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1216 | /* |
1217 | * Inform apps thread of the new application registration. This | |
1218 | * call is blocking so we can be assured that the data will be read | |
1219 | * at some point in time or wait to the end of the world :) | |
1220 | */ | |
1221 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1222 | sizeof(struct ust_command)); | |
1223 | if (ret < 0) { | |
1224 | perror("write apps cmd pipe"); | |
1225 | if (errno == EBADF) { | |
1226 | /* | |
1227 | * We can't inform the application thread to process | |
1228 | * registration. We will exit or else application | |
1229 | * registration will not occur and tracing will never | |
1230 | * start. | |
1231 | */ | |
1232 | goto error; | |
1233 | } | |
1234 | } | |
1235 | free(ust_cmd); | |
1236 | } while (node != NULL); | |
1237 | ||
1238 | /* Futex wait on queue. Blocking call on futex() */ | |
1239 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1240 | } | |
1241 | ||
1242 | error: | |
1243 | DBG("Dispatch thread dying"); | |
1244 | return NULL; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * This thread manage application registration. | |
1249 | */ | |
1250 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1251 | { |
5eb91c98 DG |
1252 | int sock = 0, i, ret, pollfd; |
1253 | uint32_t revents, nb_fd; | |
1254 | struct lttng_poll_event events; | |
099e26bd DG |
1255 | /* |
1256 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1257 | * freed in the manage apps thread. | |
1258 | */ | |
1259 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1260 | |
099e26bd | 1261 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1262 | |
1263 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1264 | if (ret < 0) { | |
1265 | goto error; | |
1266 | } | |
1267 | ||
5eb91c98 DG |
1268 | /* |
1269 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1270 | * more will be added to this poll set. | |
1271 | */ | |
1272 | ret = create_thread_poll_set(&events, 2); | |
1273 | if (ret < 0) { | |
1274 | goto error; | |
1275 | } | |
273ea72c | 1276 | |
5eb91c98 DG |
1277 | /* Add the application registration socket */ |
1278 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1279 | if (ret < 0) { | |
1280 | goto error; | |
1281 | } | |
273ea72c | 1282 | |
1d4b027a | 1283 | /* Notify all applications to register */ |
0fdd1e2c DG |
1284 | ret = notify_ust_apps(1); |
1285 | if (ret < 0) { | |
1286 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1287 | "Execution continues but there might be problem for already\n" |
1288 | "running applications that wishes to register."); | |
0fdd1e2c | 1289 | } |
1d4b027a DG |
1290 | |
1291 | while (1) { | |
1292 | DBG("Accepting application registration"); | |
273ea72c | 1293 | |
5eb91c98 DG |
1294 | nb_fd = LTTNG_POLL_GETNB(&events); |
1295 | ||
273ea72c | 1296 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1297 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1298 | if (ret < 0) { |
273ea72c DG |
1299 | goto error; |
1300 | } | |
1301 | ||
5eb91c98 DG |
1302 | for (i = 0; i < nb_fd; i++) { |
1303 | /* Fetch once the poll data */ | |
1304 | revents = LTTNG_POLL_GETEV(&events, i); | |
1305 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1306 | |
5eb91c98 DG |
1307 | /* Thread quit pipe has been closed. Killing thread. */ |
1308 | ret = check_thread_quit_pipe(pollfd, revents); | |
1309 | if (ret) { | |
90014c57 DG |
1310 | goto error; |
1311 | } | |
1d4b027a | 1312 | |
5eb91c98 DG |
1313 | /* Event on the registration socket */ |
1314 | if (pollfd == apps_sock) { | |
1315 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1316 | ERR("Register apps socket poll error"); | |
1317 | goto error; | |
1318 | } else if (revents & LPOLLIN) { | |
1319 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1320 | if (sock < 0) { | |
1321 | goto error; | |
1322 | } | |
099e26bd | 1323 | |
5eb91c98 | 1324 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1325 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1326 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1327 | perror("ust command zmalloc"); |
5eb91c98 DG |
1328 | goto error; |
1329 | } | |
1d4b027a | 1330 | |
5eb91c98 DG |
1331 | /* |
1332 | * Using message-based transmissions to ensure we don't | |
1333 | * have to deal with partially received messages. | |
1334 | */ | |
1335 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1336 | sizeof(struct ust_register_msg)); | |
1337 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1338 | if (ret < 0) { | |
1339 | perror("lttcomm_recv_unix_sock register apps"); | |
1340 | } else { | |
1341 | ERR("Wrong size received on apps register"); | |
1342 | } | |
1343 | free(ust_cmd); | |
1344 | close(sock); | |
1345 | continue; | |
1346 | } | |
099e26bd | 1347 | |
5eb91c98 | 1348 | ust_cmd->sock = sock; |
099e26bd | 1349 | |
5eb91c98 DG |
1350 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1351 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1352 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1353 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1354 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1355 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1356 | |
5eb91c98 DG |
1357 | /* |
1358 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1359 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1360 | */ |
1361 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1362 | ||
1363 | /* | |
1364 | * Wake the registration queue futex. Implicit memory | |
1365 | * barrier with the exchange in cds_wfq_enqueue. | |
1366 | */ | |
1367 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1368 | } | |
1369 | } | |
90014c57 | 1370 | } |
1d4b027a DG |
1371 | } |
1372 | ||
1373 | error: | |
0fdd1e2c DG |
1374 | DBG("UST Registration thread dying"); |
1375 | ||
1376 | /* Notify that the registration thread is gone */ | |
1377 | notify_ust_apps(0); | |
1378 | ||
1379 | close(apps_sock); | |
1380 | close(sock); | |
273ea72c | 1381 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1382 | |
5eb91c98 DG |
1383 | lttng_poll_clean(&events); |
1384 | ||
1d4b027a DG |
1385 | return NULL; |
1386 | } | |
1387 | ||
8c0faa1d | 1388 | /* |
3bd1e081 | 1389 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1390 | * exec or it will fails. |
8c0faa1d | 1391 | */ |
3bd1e081 | 1392 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1393 | { |
1394 | int ret; | |
ee0b0061 DG |
1395 | struct timespec timeout; |
1396 | ||
1397 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1398 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1399 | |
1400 | /* Setup semaphore */ | |
3bd1e081 | 1401 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1402 | if (ret < 0) { |
3bd1e081 | 1403 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1404 | goto error; |
1405 | } | |
8c0faa1d | 1406 | |
3bd1e081 MD |
1407 | ret = pthread_create(&consumer_data->thread, NULL, |
1408 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1409 | if (ret != 0) { |
3bd1e081 | 1410 | PERROR("pthread_create consumer"); |
ee0b0061 | 1411 | ret = -1; |
8c0faa1d DG |
1412 | goto error; |
1413 | } | |
1414 | ||
ee0b0061 DG |
1415 | /* Get time for sem_timedwait absolute timeout */ |
1416 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1417 | if (ret < 0) { | |
3bd1e081 | 1418 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1419 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1420 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1421 | } else { |
1422 | /* Normal timeout if the gettime was successful */ | |
1423 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1424 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1425 | } |
8c0faa1d | 1426 | |
ee0b0061 DG |
1427 | if (ret < 0) { |
1428 | if (errno == ETIMEDOUT) { | |
1429 | /* | |
1430 | * Call has timed out so we kill the kconsumerd_thread and return | |
1431 | * an error. | |
1432 | */ | |
3bd1e081 MD |
1433 | ERR("The consumer thread was never ready. Killing it"); |
1434 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1435 | if (ret < 0) { |
3bd1e081 | 1436 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1437 | } |
1438 | } else { | |
3bd1e081 | 1439 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1440 | } |
1441 | goto error; | |
1442 | } | |
1443 | ||
3bd1e081 MD |
1444 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1445 | if (consumer_data->pid == 0) { | |
712ea556 | 1446 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1447 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1448 | goto error; |
1449 | } | |
3bd1e081 | 1450 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1451 | |
8c0faa1d DG |
1452 | return 0; |
1453 | ||
1454 | error: | |
1455 | return ret; | |
1456 | } | |
1457 | ||
d9800920 | 1458 | /* |
3bd1e081 | 1459 | * Join consumer thread |
d9800920 | 1460 | */ |
3bd1e081 | 1461 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1462 | { |
1463 | void *status; | |
1464 | int ret; | |
1465 | ||
3bd1e081 MD |
1466 | if (consumer_data->pid != 0) { |
1467 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1468 | if (ret) { |
3bd1e081 | 1469 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1470 | return ret; |
1471 | } | |
3bd1e081 | 1472 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1473 | } else { |
1474 | return 0; | |
1475 | } | |
1476 | } | |
1477 | ||
8c0faa1d | 1478 | /* |
3bd1e081 | 1479 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1480 | * |
d063d709 | 1481 | * Return pid if successful else -1. |
8c0faa1d | 1482 | */ |
3bd1e081 | 1483 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1484 | { |
1485 | int ret; | |
1486 | pid_t pid; | |
53086306 | 1487 | const char *verbosity; |
8c0faa1d | 1488 | |
3bd1e081 | 1489 | DBG("Spawning consumerd"); |
c49dc785 | 1490 | |
8c0faa1d DG |
1491 | pid = fork(); |
1492 | if (pid == 0) { | |
1493 | /* | |
3bd1e081 | 1494 | * Exec consumerd. |
8c0faa1d | 1495 | */ |
3bd1e081 | 1496 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1497 | verbosity = "--verbose"; |
1498 | } else { | |
1499 | verbosity = "--quiet"; | |
1500 | } | |
3bd1e081 MD |
1501 | switch (consumer_data->type) { |
1502 | case LTTNG_CONSUMER_KERNEL: | |
1503 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
7753dea8 MD |
1504 | "lttng-consumerd", verbosity, "-k", |
1505 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1506 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1507 | NULL); | |
3bd1e081 | 1508 | break; |
7753dea8 MD |
1509 | case LTTNG_CONSUMER64_UST: |
1510 | { | |
1511 | char path[PATH_MAX]; | |
1512 | ||
1513 | snprintf(path, PATH_MAX, "%s/%s", | |
1514 | consumerd64_bindir, consumerd64_prog); | |
1515 | execl(path, verbosity, "-u", | |
1516 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1517 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1518 | NULL); | |
3bd1e081 | 1519 | break; |
7753dea8 MD |
1520 | } |
1521 | case LTTNG_CONSUMER32_UST: | |
1522 | { | |
1523 | char path[PATH_MAX]; | |
1524 | ||
1525 | snprintf(path, PATH_MAX, "%s/%s", | |
1526 | consumerd32_bindir, consumerd32_prog); | |
1527 | execl(path, verbosity, "-u", | |
1528 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1529 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1530 | NULL); | |
1531 | break; | |
1532 | } | |
3bd1e081 MD |
1533 | default: |
1534 | perror("unknown consumer type"); | |
1535 | exit(EXIT_FAILURE); | |
1536 | } | |
8c0faa1d DG |
1537 | if (errno != 0) { |
1538 | perror("kernel start consumer exec"); | |
1539 | } | |
1540 | exit(EXIT_FAILURE); | |
1541 | } else if (pid > 0) { | |
1542 | ret = pid; | |
8c0faa1d | 1543 | } else { |
3bd1e081 | 1544 | perror("start consumer fork"); |
8c0faa1d | 1545 | ret = -errno; |
8c0faa1d | 1546 | } |
8c0faa1d DG |
1547 | return ret; |
1548 | } | |
1549 | ||
693bd40b | 1550 | /* |
3bd1e081 | 1551 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1552 | */ |
3bd1e081 | 1553 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1554 | { |
1555 | int ret; | |
1556 | ||
3bd1e081 MD |
1557 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1558 | if (consumer_data->pid != 0) { | |
1559 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1560 | goto end; |
1561 | } | |
693bd40b | 1562 | |
3bd1e081 | 1563 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1564 | if (ret < 0) { |
3bd1e081 MD |
1565 | ERR("Spawning consumerd failed"); |
1566 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1567 | goto error; |
693bd40b | 1568 | } |
c49dc785 | 1569 | |
3bd1e081 MD |
1570 | /* Setting up the consumer_data pid */ |
1571 | consumer_data->pid = ret; | |
48842b30 | 1572 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1573 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1574 | |
3bd1e081 MD |
1575 | DBG2("Spawning consumer control thread"); |
1576 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1577 | if (ret < 0) { |
3bd1e081 | 1578 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1579 | goto error; |
1580 | } | |
1581 | ||
c49dc785 | 1582 | end: |
693bd40b DG |
1583 | return 0; |
1584 | ||
1585 | error: | |
1586 | return ret; | |
1587 | } | |
1588 | ||
b73401da | 1589 | /* |
d063d709 | 1590 | * modprobe_kernel_modules |
b73401da DG |
1591 | */ |
1592 | static int modprobe_kernel_modules(void) | |
1593 | { | |
ab147185 | 1594 | int ret = 0, i; |
b73401da DG |
1595 | char modprobe[256]; |
1596 | ||
ab147185 MD |
1597 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1598 | ret = snprintf(modprobe, sizeof(modprobe), | |
1599 | "/sbin/modprobe %s%s", | |
24b487b8 | 1600 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1601 | kernel_modules_list[i].name); |
b73401da DG |
1602 | if (ret < 0) { |
1603 | perror("snprintf modprobe"); | |
1604 | goto error; | |
1605 | } | |
ab147185 | 1606 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1607 | ret = system(modprobe); |
ab147185 MD |
1608 | if (ret == -1) { |
1609 | ERR("Unable to launch modprobe for module %s", | |
1610 | kernel_modules_list[i].name); | |
1611 | } else if (kernel_modules_list[i].required | |
d9800920 | 1612 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1613 | ERR("Unable to load module %s", |
1614 | kernel_modules_list[i].name); | |
1615 | } else { | |
1616 | DBG("Modprobe successfully %s", | |
1617 | kernel_modules_list[i].name); | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | error: | |
1622 | return ret; | |
1623 | } | |
1624 | ||
b73401da | 1625 | /* |
d063d709 | 1626 | * mount_debugfs |
b73401da DG |
1627 | */ |
1628 | static int mount_debugfs(char *path) | |
1629 | { | |
1630 | int ret; | |
1631 | char *type = "debugfs"; | |
1632 | ||
996b65c8 | 1633 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1634 | if (ret < 0) { |
7272acf5 | 1635 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1636 | goto error; |
1637 | } | |
1638 | ||
1639 | ret = mount(type, path, type, 0, NULL); | |
1640 | if (ret < 0) { | |
7272acf5 | 1641 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1642 | goto error; |
1643 | } | |
1644 | ||
1645 | DBG("Mounted debugfs successfully at %s", path); | |
1646 | ||
1647 | error: | |
1648 | return ret; | |
1649 | } | |
1650 | ||
8c0faa1d | 1651 | /* |
d063d709 | 1652 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1653 | */ |
f3ed775e | 1654 | static void init_kernel_tracer(void) |
8c0faa1d | 1655 | { |
b73401da DG |
1656 | int ret; |
1657 | char *proc_mounts = "/proc/mounts"; | |
1658 | char line[256]; | |
684d34d2 | 1659 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1660 | FILE *fp; |
1661 | ||
1662 | /* Detect debugfs */ | |
1663 | fp = fopen(proc_mounts, "r"); | |
1664 | if (fp == NULL) { | |
1665 | ERR("Unable to probe %s", proc_mounts); | |
1666 | goto error; | |
1667 | } | |
1668 | ||
1669 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1670 | if (strstr(line, "debugfs") != NULL) { | |
1671 | /* Remove first string */ | |
1672 | strtok(line, " "); | |
1673 | /* Dup string here so we can reuse line later on */ | |
1674 | debugfs_path = strdup(strtok(NULL, " ")); | |
1675 | DBG("Got debugfs path : %s", debugfs_path); | |
1676 | break; | |
1677 | } | |
1678 | } | |
1679 | ||
1680 | fclose(fp); | |
1681 | ||
1682 | /* Mount debugfs if needded */ | |
1683 | if (debugfs_path == NULL) { | |
1684 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1685 | if (ret < 0) { | |
1686 | perror("asprintf debugfs path"); | |
1687 | goto error; | |
1688 | } | |
1689 | ret = mount_debugfs(debugfs_path); | |
1690 | if (ret < 0) { | |
7272acf5 | 1691 | perror("Cannot mount debugfs"); |
b73401da DG |
1692 | goto error; |
1693 | } | |
1694 | } | |
1695 | ||
1696 | /* Modprobe lttng kernel modules */ | |
1697 | ret = modprobe_kernel_modules(); | |
1698 | if (ret < 0) { | |
1699 | goto error; | |
1700 | } | |
1701 | ||
1702 | /* Setup lttng kernel path */ | |
1703 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1704 | if (ret < 0) { | |
1705 | perror("asprintf lttng path"); | |
1706 | goto error; | |
1707 | } | |
1708 | ||
1709 | /* Open debugfs lttng */ | |
1710 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1711 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1712 | DBG("Failed to open %s", lttng_path); |
1713 | goto error; | |
8c0faa1d DG |
1714 | } |
1715 | ||
b73401da DG |
1716 | free(lttng_path); |
1717 | free(debugfs_path); | |
f3ed775e | 1718 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1719 | return; |
1720 | ||
1721 | error: | |
1722 | if (lttng_path) { | |
1723 | free(lttng_path); | |
1724 | } | |
1725 | if (debugfs_path) { | |
1726 | free(debugfs_path); | |
1727 | } | |
1728 | WARN("No kernel tracer available"); | |
1729 | kernel_tracer_fd = 0; | |
1730 | return; | |
f3ed775e | 1731 | } |
33a2b854 | 1732 | |
f3ed775e | 1733 | /* |
54d01ffb | 1734 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1735 | */ |
54d01ffb | 1736 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1737 | { |
f40799e8 | 1738 | int ret = 0; |
8c0faa1d | 1739 | |
3bd1e081 | 1740 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1741 | /* |
54d01ffb DG |
1742 | * Assign default kernel consumer socket if no consumer assigned to the |
1743 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1744 | * an extra security check. | |
d9800920 DG |
1745 | */ |
1746 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1747 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1748 | } |
1749 | ||
2bdd86d4 | 1750 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1751 | if (ret < 0) { |
f3ed775e DG |
1752 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1753 | goto error; | |
1754 | } | |
1d4b027a | 1755 | |
3bd1e081 | 1756 | session->consumer_fds_sent = 1; |
f3ed775e | 1757 | } |
1d4b027a DG |
1758 | |
1759 | error: | |
1760 | return ret; | |
8c0faa1d DG |
1761 | } |
1762 | ||
0177d773 DG |
1763 | /* |
1764 | * Create an UST session and add it to the session ust list. | |
1765 | */ | |
44d3bd01 DG |
1766 | static int create_ust_session(struct ltt_session *session, |
1767 | struct lttng_domain *domain) | |
0177d773 | 1768 | { |
44d3bd01 | 1769 | int ret; |
48842b30 | 1770 | unsigned int uid; |
13384287 | 1771 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1772 | |
1773 | switch (domain->type) { | |
48842b30 | 1774 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1775 | break; |
1776 | default: | |
13384287 | 1777 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1778 | goto error; |
1779 | } | |
0177d773 DG |
1780 | |
1781 | DBG("Creating UST session"); | |
1782 | ||
44e96653 | 1783 | uid = session->uid; |
48842b30 | 1784 | lus = trace_ust_create_session(session->path, uid, domain); |
0177d773 | 1785 | if (lus == NULL) { |
44d3bd01 | 1786 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1787 | goto error; |
1788 | } | |
1789 | ||
48842b30 | 1790 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1791 | geteuid(), allowed_group()); |
1792 | if (ret < 0) { | |
1793 | if (ret != -EEXIST) { | |
1794 | ERR("Trace directory creation error"); | |
44d3bd01 | 1795 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1796 | goto error; |
1797 | } | |
1798 | } | |
1799 | ||
f6a9efaa DG |
1800 | /* The domain type dictate different actions on session creation */ |
1801 | switch (domain->type) { | |
48842b30 DG |
1802 | case LTTNG_DOMAIN_UST: |
1803 | /* No ustctl for the global UST domain */ | |
1804 | break; | |
1805 | default: | |
36dc12cc | 1806 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1807 | goto error; |
0177d773 | 1808 | } |
f6a9efaa | 1809 | session->ust_session = lus; |
44d3bd01 DG |
1810 | |
1811 | return LTTCOMM_OK; | |
0177d773 DG |
1812 | |
1813 | error: | |
1814 | free(lus); | |
1815 | return ret; | |
1816 | } | |
1817 | ||
333f285e | 1818 | /* |
d063d709 | 1819 | * Create a kernel tracer session then create the default channel. |
333f285e | 1820 | */ |
f3ed775e | 1821 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1822 | { |
f3ed775e | 1823 | int ret; |
f3ed775e DG |
1824 | |
1825 | DBG("Creating kernel session"); | |
1826 | ||
1827 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1828 | if (ret < 0) { | |
1829 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1830 | goto error; | |
333f285e DG |
1831 | } |
1832 | ||
d9800920 | 1833 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1834 | if (kconsumer_data.cmd_sock) { |
1835 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1836 | } |
1837 | ||
63053e7c DG |
1838 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1839 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1840 | if (ret < 0) { |
996b65c8 | 1841 | if (ret != -EEXIST) { |
7a485870 DG |
1842 | ERR("Trace directory creation error"); |
1843 | goto error; | |
1844 | } | |
1845 | } | |
1846 | ||
f3ed775e DG |
1847 | error: |
1848 | return ret; | |
333f285e DG |
1849 | } |
1850 | ||
6c9cc2ab DG |
1851 | /* |
1852 | * Using the session list, filled a lttng_session array to send back to the | |
1853 | * client for session listing. | |
1854 | * | |
1855 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1856 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1857 | */ |
1858 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1859 | { | |
1860 | int i = 0; | |
1861 | struct ltt_session *session; | |
1862 | ||
1863 | DBG("Getting all available session"); | |
1864 | /* | |
1865 | * Iterate over session list and append data after the control struct in | |
1866 | * the buffer. | |
1867 | */ | |
1868 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1869 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1870 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1871 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1872 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1873 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1874 | i++; |
1875 | } | |
1876 | } | |
1877 | ||
9f19cc17 DG |
1878 | /* |
1879 | * Fill lttng_channel array of all channels. | |
1880 | */ | |
b551a063 | 1881 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1882 | struct lttng_channel *channels) |
1883 | { | |
1884 | int i = 0; | |
1885 | struct ltt_kernel_channel *kchan; | |
1886 | ||
1887 | DBG("Listing channels for session %s", session->name); | |
1888 | ||
b551a063 DG |
1889 | switch (domain) { |
1890 | case LTTNG_DOMAIN_KERNEL: | |
1891 | /* Kernel channels */ | |
1892 | if (session->kernel_session != NULL) { | |
1893 | cds_list_for_each_entry(kchan, | |
1894 | &session->kernel_session->channel_list.head, list) { | |
1895 | /* Copy lttng_channel struct to array */ | |
1896 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1897 | channels[i].enabled = kchan->enabled; | |
1898 | i++; | |
1899 | } | |
1900 | } | |
1901 | break; | |
1902 | case LTTNG_DOMAIN_UST: | |
1903 | { | |
1904 | struct cds_lfht_iter iter; | |
1905 | struct ltt_ust_channel *uchan; | |
1906 | ||
1907 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1908 | &iter, uchan, node) { | |
1909 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1910 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1911 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1912 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1913 | channels[i].attr.switch_timer_interval = | |
1914 | uchan->attr.switch_timer_interval; | |
1915 | channels[i].attr.read_timer_interval = | |
1916 | uchan->attr.read_timer_interval; | |
1917 | channels[i].attr.output = uchan->attr.output; | |
befe0905 | 1918 | i++; |
b551a063 DG |
1919 | } |
1920 | break; | |
1921 | } | |
1922 | default: | |
1923 | break; | |
1924 | } | |
1925 | } | |
1926 | ||
1927 | /* | |
1928 | * Create a list of ust global domain events. | |
1929 | */ | |
1930 | static int list_lttng_ust_global_events(char *channel_name, | |
1931 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1932 | { | |
1933 | int i = 0, ret = 0; | |
1934 | unsigned int nb_event = 0; | |
1935 | struct cds_lfht_iter iter; | |
1936 | struct ltt_ust_channel *uchan; | |
1937 | struct ltt_ust_event *uevent; | |
1938 | struct lttng_event *tmp; | |
1939 | ||
1940 | DBG("Listing UST global events for channel %s", channel_name); | |
1941 | ||
1942 | rcu_read_lock(); | |
1943 | ||
1944 | /* Count events in all channels */ | |
1945 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1946 | nb_event += hashtable_get_count(uchan->events); | |
1947 | } | |
1948 | ||
1949 | if (nb_event == 0) { | |
1950 | ret = nb_event; | |
1951 | goto error; | |
1952 | } | |
1953 | ||
1954 | DBG3("Listing UST global %d events", nb_event); | |
1955 | ||
1956 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1957 | if (tmp == NULL) { | |
1958 | ret = -LTTCOMM_FATAL; | |
1959 | goto error; | |
1960 | } | |
1961 | ||
1962 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1963 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
1964 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1965 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
37357452 | 1966 | tmp[i].enabled = uevent->enabled; |
b551a063 DG |
1967 | switch (uevent->attr.instrumentation) { |
1968 | case LTTNG_UST_TRACEPOINT: | |
1969 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1970 | break; | |
1971 | case LTTNG_UST_PROBE: | |
1972 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1973 | break; | |
1974 | case LTTNG_UST_FUNCTION: | |
1975 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1976 | break; | |
1977 | } | |
9f19cc17 DG |
1978 | i++; |
1979 | } | |
1980 | } | |
1981 | ||
b551a063 DG |
1982 | ret = nb_event; |
1983 | *events = tmp; | |
1984 | ||
1985 | error: | |
1986 | rcu_read_unlock(); | |
1987 | return ret; | |
9f19cc17 DG |
1988 | } |
1989 | ||
1990 | /* | |
b551a063 | 1991 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 1992 | */ |
b551a063 DG |
1993 | static int list_lttng_kernel_events(char *channel_name, |
1994 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 1995 | { |
b551a063 DG |
1996 | int i = 0, ret; |
1997 | unsigned int nb_event; | |
9f19cc17 | 1998 | struct ltt_kernel_event *event; |
b551a063 DG |
1999 | struct ltt_kernel_channel *kchan; |
2000 | ||
2001 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2002 | if (kchan == NULL) { | |
2003 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2004 | goto error; | |
2005 | } | |
2006 | ||
2007 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2008 | |
2009 | DBG("Listing events for channel %s", kchan->channel->name); | |
2010 | ||
b551a063 DG |
2011 | if (nb_event == 0) { |
2012 | ret = nb_event; | |
2013 | goto error; | |
2014 | } | |
2015 | ||
2016 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2017 | if (*events == NULL) { | |
2018 | ret = LTTCOMM_FATAL; | |
2019 | goto error; | |
2020 | } | |
2021 | ||
9f19cc17 DG |
2022 | /* Kernel channels */ |
2023 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2024 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2025 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2026 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2027 | switch (event->event->instrumentation) { |
2028 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2029 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2030 | break; |
2031 | case LTTNG_KERNEL_KPROBE: | |
2032 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2033 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2034 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2035 | sizeof(struct lttng_kernel_kprobe)); |
2036 | break; | |
2037 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2038 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2039 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2040 | sizeof(struct lttng_kernel_function)); |
2041 | break; | |
0133c199 | 2042 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2043 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2044 | break; |
a54bd42d | 2045 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2046 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2047 | break; |
7a3d1328 MD |
2048 | case LTTNG_KERNEL_ALL: |
2049 | assert(0); | |
2050 | break; | |
9f19cc17 DG |
2051 | } |
2052 | i++; | |
2053 | } | |
b551a063 DG |
2054 | |
2055 | return nb_event; | |
2056 | ||
2057 | error: | |
2058 | return ret; | |
9f19cc17 DG |
2059 | } |
2060 | ||
fac6795d | 2061 | /* |
54d01ffb | 2062 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2063 | */ |
54d01ffb DG |
2064 | static int cmd_disable_channel(struct ltt_session *session, |
2065 | int domain, char *channel_name) | |
fac6795d | 2066 | { |
54d01ffb | 2067 | int ret; |
379473d2 | 2068 | |
54d01ffb DG |
2069 | switch (domain) { |
2070 | case LTTNG_DOMAIN_KERNEL: | |
2071 | ret = channel_kernel_disable(session->kernel_session, | |
2072 | channel_name); | |
2073 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
2074 | goto error; |
2075 | } | |
54d01ffb DG |
2076 | |
2077 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 2078 | break; |
44d3bd01 DG |
2079 | case LTTNG_DOMAIN_UST_PID: |
2080 | break; | |
d0254c7c | 2081 | default: |
44d3bd01 | 2082 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 2083 | goto error; |
20fe2104 DG |
2084 | } |
2085 | ||
54d01ffb | 2086 | ret = LTTCOMM_OK; |
d65106b1 | 2087 | |
54d01ffb DG |
2088 | error: |
2089 | return ret; | |
2090 | } | |
2091 | ||
56fff090 DG |
2092 | /* |
2093 | * Copy channel from attributes and set it in the application channel list. | |
2094 | */ | |
f6a9efaa | 2095 | /* |
56fff090 DG |
2096 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2097 | struct lttng_channel *attr, struct ust_app *app) | |
2098 | { | |
2099 | int ret; | |
2100 | struct ltt_ust_channel *uchan, *new_chan; | |
2101 | ||
f6a9efaa | 2102 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2103 | if (uchan == NULL) { |
2104 | ret = LTTCOMM_FATAL; | |
2105 | goto error; | |
2106 | } | |
2107 | ||
2108 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2109 | if (new_chan == NULL) { | |
2110 | PERROR("malloc ltt_ust_channel"); | |
2111 | ret = LTTCOMM_FATAL; | |
2112 | goto error; | |
2113 | } | |
2114 | ||
2115 | ret = channel_ust_copy(new_chan, uchan); | |
2116 | if (ret < 0) { | |
2117 | ret = LTTCOMM_FATAL; | |
2118 | goto error; | |
2119 | } | |
2120 | ||
56fff090 DG |
2121 | error: |
2122 | return ret; | |
2123 | } | |
f6a9efaa | 2124 | */ |
56fff090 | 2125 | |
54d01ffb DG |
2126 | /* |
2127 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2128 | */ | |
44d3bd01 DG |
2129 | static int cmd_enable_channel(struct ltt_session *session, |
2130 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
2131 | { |
2132 | int ret; | |
f6a9efaa DG |
2133 | struct ltt_ust_session *usess = session->ust_session; |
2134 | ||
5d56b5aa | 2135 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2136 | |
44d3bd01 DG |
2137 | switch (domain->type) { |
2138 | case LTTNG_DOMAIN_KERNEL: | |
2139 | { | |
2140 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2141 | |
44d3bd01 DG |
2142 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2143 | session->kernel_session); | |
2144 | if (kchan == NULL) { | |
2145 | ret = channel_kernel_create(session->kernel_session, | |
2146 | attr, kernel_poll_pipe[1]); | |
2147 | } else { | |
2148 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2149 | } | |
2150 | ||
2151 | if (ret != LTTCOMM_OK) { | |
2152 | goto error; | |
2153 | } | |
2154 | ||
2155 | kernel_wait_quiescent(kernel_tracer_fd); | |
2156 | break; | |
2157 | } | |
f6a9efaa DG |
2158 | case LTTNG_DOMAIN_UST: |
2159 | { | |
2160 | struct ltt_ust_channel *uchan; | |
2161 | ||
48842b30 | 2162 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2163 | |
48842b30 | 2164 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2165 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2166 | attr->name); | |
2167 | if (uchan == NULL) { | |
48842b30 | 2168 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2169 | if (uchan == NULL) { |
2170 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2171 | goto error; | |
2172 | } | |
d5cd1f34 | 2173 | |
f6a9efaa DG |
2174 | rcu_read_lock(); |
2175 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2176 | rcu_read_unlock(); | |
48842b30 | 2177 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa DG |
2178 | } else { |
2179 | ret = LTTCOMM_UST_CHAN_EXIST; | |
2180 | goto error; | |
2181 | } | |
2182 | ||
421cb601 | 2183 | /* Add channel to all registered applications */ |
5b4a0ec0 | 2184 | ret = ust_app_create_channel_all(usess, uchan); |
509cbaf8 | 2185 | if (ret != 0) { |
48842b30 DG |
2186 | goto error; |
2187 | } | |
f6a9efaa | 2188 | |
37357452 DG |
2189 | uchan->enabled = 1; |
2190 | ||
f6a9efaa DG |
2191 | break; |
2192 | } | |
44d3bd01 DG |
2193 | case LTTNG_DOMAIN_UST_PID: |
2194 | { | |
f6a9efaa | 2195 | /* |
56fff090 DG |
2196 | int sock; |
2197 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 2198 | struct ltt_ust_session *usess; |
56fff090 | 2199 | struct ust_app *app; |
44d3bd01 DG |
2200 | |
2201 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
2202 | domain->attr.pid); | |
2203 | if (usess == NULL) { | |
2204 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2205 | goto error; | |
2206 | } | |
2207 | ||
56fff090 | 2208 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
2209 | if (app == NULL) { |
2210 | ret = LTTCOMM_APP_NOT_FOUND; | |
2211 | goto error; | |
2212 | } | |
56fff090 | 2213 | sock = app->sock; |
44d3bd01 DG |
2214 | |
2215 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
2216 | if (uchan == NULL) { | |
56fff090 | 2217 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 2218 | } else { |
56fff090 | 2219 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
2220 | } |
2221 | ||
2222 | if (ret != LTTCOMM_OK) { | |
2223 | goto error; | |
2224 | } | |
2225 | ||
56fff090 DG |
2226 | ret = copy_ust_channel_to_app(usess, attr, app); |
2227 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
2228 | goto error; |
2229 | } | |
2230 | ||
44d3bd01 DG |
2231 | DBG("UST channel %s created for app sock %d with pid %d", |
2232 | attr->name, app->sock, domain->attr.pid); | |
f6a9efaa DG |
2233 | */ |
2234 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2235 | goto error; | |
44d3bd01 DG |
2236 | } |
2237 | default: | |
2238 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2239 | goto error; | |
54d01ffb DG |
2240 | } |
2241 | ||
2242 | ret = LTTCOMM_OK; | |
2243 | ||
2244 | error: | |
2245 | return ret; | |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2250 | */ | |
2251 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2252 | char *channel_name, char *event_name) | |
2253 | { | |
2254 | int ret; | |
54d01ffb DG |
2255 | |
2256 | switch (domain) { | |
2257 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2258 | { |
2259 | struct ltt_kernel_channel *kchan; | |
2260 | ||
54d01ffb DG |
2261 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2262 | session->kernel_session); | |
2263 | if (kchan == NULL) { | |
2264 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2265 | goto error; | |
d65106b1 DG |
2266 | } |
2267 | ||
7a3d1328 | 2268 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2269 | if (ret != LTTCOMM_OK) { |
2270 | goto error; | |
2271 | } | |
2272 | ||
2273 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2274 | break; |
2bdd86d4 MD |
2275 | } |
2276 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2277 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2278 | case LTTNG_DOMAIN_UST_PID: | |
2279 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2280 | default: |
2bdd86d4 | 2281 | /* TODO: Other UST domains */ |
54d01ffb DG |
2282 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2283 | goto error; | |
d65106b1 | 2284 | } |
26cc6b4e | 2285 | |
54d01ffb DG |
2286 | ret = LTTCOMM_OK; |
2287 | ||
2288 | error: | |
2289 | return ret; | |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2294 | */ | |
2295 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2296 | char *channel_name) | |
2297 | { | |
2298 | int ret; | |
2299 | struct ltt_kernel_channel *kchan; | |
2300 | ||
2301 | switch (domain) { | |
2302 | case LTTNG_DOMAIN_KERNEL: | |
2303 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2304 | session->kernel_session); | |
2305 | if (kchan == NULL) { | |
2306 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2307 | goto error; | |
26cc6b4e DG |
2308 | } |
2309 | ||
54d01ffb DG |
2310 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2311 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2312 | goto error; |
26cc6b4e DG |
2313 | } |
2314 | ||
54d01ffb | 2315 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2316 | break; |
54d01ffb DG |
2317 | default: |
2318 | /* TODO: Userspace tracing */ | |
2319 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2320 | goto error; | |
26cc6b4e | 2321 | } |
e953ef25 | 2322 | |
54d01ffb | 2323 | ret = LTTCOMM_OK; |
e953ef25 | 2324 | |
54d01ffb DG |
2325 | error: |
2326 | return ret; | |
2327 | } | |
f5177a38 | 2328 | |
54d01ffb DG |
2329 | /* |
2330 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2331 | */ | |
2332 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2333 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2334 | { | |
2335 | int ret; | |
f5177a38 | 2336 | |
54d01ffb DG |
2337 | switch (domain) { |
2338 | case LTTNG_DOMAIN_KERNEL: | |
2339 | /* Add kernel context to kernel tracer */ | |
2340 | ret = context_kernel_add(session->kernel_session, ctx, | |
2341 | event_name, channel_name); | |
2342 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2343 | goto error; |
e953ef25 | 2344 | } |
2bdd86d4 MD |
2345 | break; |
2346 | case LTTNG_DOMAIN_UST: | |
2347 | { | |
48842b30 DG |
2348 | /* |
2349 | struct ltt_ust_session *usess; | |
e953ef25 | 2350 | |
48842b30 DG |
2351 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2352 | ret = context_ust_add(usess, ctx, | |
2353 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2354 | if (ret != LTTCOMM_OK) { |
2355 | goto error; | |
2356 | } | |
2357 | } | |
e953ef25 | 2358 | break; |
48842b30 | 2359 | */ |
2bdd86d4 | 2360 | } |
54d01ffb | 2361 | default: |
2bdd86d4 | 2362 | /* TODO: UST other domains */ |
54d01ffb DG |
2363 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2364 | goto error; | |
e953ef25 | 2365 | } |
950131af | 2366 | |
54d01ffb | 2367 | ret = LTTCOMM_OK; |
950131af | 2368 | |
54d01ffb DG |
2369 | error: |
2370 | return ret; | |
2371 | } | |
2372 | ||
2373 | /* | |
2374 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2375 | */ | |
2376 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2377 | char *channel_name, struct lttng_event *event) | |
2378 | { | |
2379 | int ret; | |
f6cd6b0f | 2380 | struct lttng_channel *attr; |
48842b30 | 2381 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2382 | |
2383 | switch (domain) { | |
2384 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2385 | { |
2386 | struct ltt_kernel_channel *kchan; | |
2387 | ||
54d01ffb DG |
2388 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2389 | session->kernel_session); | |
2390 | if (kchan == NULL) { | |
f6cd6b0f DG |
2391 | attr = channel_new_default_attr(domain); |
2392 | if (attr == NULL) { | |
2393 | ret = LTTCOMM_FATAL; | |
2394 | goto error; | |
2395 | } | |
2396 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2397 | ||
54d01ffb | 2398 | /* This call will notify the kernel thread */ |
44d3bd01 | 2399 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2400 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2401 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2402 | goto error; |
2403 | } | |
54d01ffb | 2404 | } |
950131af | 2405 | |
54d01ffb DG |
2406 | /* Get the newly created kernel channel pointer */ |
2407 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2408 | session->kernel_session); | |
2409 | if (kchan == NULL) { | |
2410 | /* This sould not happen... */ | |
2411 | ret = LTTCOMM_FATAL; | |
2412 | goto error; | |
2413 | } | |
f5177a38 | 2414 | |
48842b30 DG |
2415 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2416 | event); | |
54d01ffb | 2417 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2418 | goto error; |
950131af DG |
2419 | } |
2420 | ||
54d01ffb | 2421 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2422 | break; |
2bdd86d4 MD |
2423 | } |
2424 | case LTTNG_DOMAIN_UST: | |
2425 | { | |
48842b30 DG |
2426 | struct ltt_ust_channel *uchan; |
2427 | struct ltt_ust_event *uevent; | |
2bdd86d4 | 2428 | |
48842b30 DG |
2429 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2430 | channel_name); | |
2431 | if (uchan == NULL) { | |
2432 | /* TODO: Create default channel */ | |
2433 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2434 | goto error; | |
2435 | } | |
2bdd86d4 | 2436 | |
48842b30 DG |
2437 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2438 | if (uevent == NULL) { | |
2439 | uevent = trace_ust_create_event(event); | |
2440 | if (uevent == NULL) { | |
2bdd86d4 MD |
2441 | ret = LTTCOMM_FATAL; |
2442 | goto error; | |
2443 | } | |
d5cd1f34 | 2444 | |
48842b30 | 2445 | } |
2bdd86d4 | 2446 | |
5b4a0ec0 | 2447 | ret = ust_app_create_event_all(usess, uchan, uevent); |
48842b30 DG |
2448 | if (ret < 0) { |
2449 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2450 | goto error; | |
2bdd86d4 | 2451 | } |
487cf67c | 2452 | |
d5cd1f34 | 2453 | /* Add ltt ust event to channel */ |
487cf67c DG |
2454 | rcu_read_lock(); |
2455 | hashtable_add_unique(uchan->events, &uevent->node); | |
2456 | rcu_read_unlock(); | |
d5cd1f34 | 2457 | |
37357452 DG |
2458 | uevent->enabled = 1; |
2459 | ||
d5cd1f34 DG |
2460 | DBG3("UST ltt event %s added to channel %s", uevent->attr.name, |
2461 | uchan->name); | |
2bdd86d4 MD |
2462 | break; |
2463 | } | |
2464 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2465 | case LTTNG_DOMAIN_UST_PID: | |
2466 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2467 | default: |
54d01ffb DG |
2468 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2469 | goto error; | |
950131af | 2470 | } |
d36b8583 | 2471 | |
54d01ffb | 2472 | ret = LTTCOMM_OK; |
d36b8583 | 2473 | |
54d01ffb DG |
2474 | error: |
2475 | return ret; | |
2476 | } | |
7d29a247 | 2477 | |
54d01ffb DG |
2478 | /* |
2479 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2480 | */ | |
2481 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2482 | char *channel_name, int event_type) |
54d01ffb DG |
2483 | { |
2484 | int ret; | |
2485 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2486 | |
54d01ffb DG |
2487 | switch (domain) { |
2488 | case LTTNG_DOMAIN_KERNEL: | |
2489 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2490 | session->kernel_session); | |
2491 | if (kchan == NULL) { | |
2492 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2493 | ret = channel_kernel_create(session->kernel_session, NULL, |
2494 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2495 | if (ret != LTTCOMM_OK) { |
2496 | goto error; | |
d36b8583 | 2497 | } |
54d01ffb | 2498 | } |
0d0c377a | 2499 | |
54d01ffb DG |
2500 | /* Get the newly created kernel channel pointer */ |
2501 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2502 | session->kernel_session); | |
2503 | if (kchan == NULL) { | |
2504 | /* This sould not happen... */ | |
2505 | ret = LTTCOMM_FATAL; | |
2506 | goto error; | |
2507 | } | |
0fdd1e2c | 2508 | |
7a3d1328 MD |
2509 | switch (event_type) { |
2510 | case LTTNG_KERNEL_SYSCALL: | |
2511 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2512 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2513 | break; |
2514 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2515 | /* |
7a3d1328 MD |
2516 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2517 | * events already registered to the channel. | |
8c9ae521 | 2518 | */ |
7a3d1328 MD |
2519 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2520 | kchan, kernel_tracer_fd); | |
2521 | break; | |
2522 | case LTTNG_KERNEL_ALL: | |
2523 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2524 | ret = event_kernel_enable_all(session->kernel_session, |
2525 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2526 | break; |
2527 | default: | |
2528 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2529 | goto error; | |
8c9ae521 | 2530 | } |
54d01ffb | 2531 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2532 | goto error; |
d36b8583 DG |
2533 | } |
2534 | ||
54d01ffb | 2535 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2536 | break; |
54d01ffb DG |
2537 | default: |
2538 | /* TODO: Userspace tracing */ | |
2539 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2540 | goto error; | |
d36b8583 | 2541 | } |
f3ed775e | 2542 | |
54d01ffb DG |
2543 | ret = LTTCOMM_OK; |
2544 | ||
2545 | error: | |
2546 | return ret; | |
2547 | } | |
2548 | ||
2549 | /* | |
2550 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2551 | */ | |
2552 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2553 | { | |
2554 | int ret; | |
2555 | ssize_t nb_events = 0; | |
2556 | ||
2557 | switch (domain) { | |
2558 | case LTTNG_DOMAIN_KERNEL: | |
2559 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2560 | if (nb_events < 0) { | |
2561 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2562 | goto error; | |
894be886 | 2563 | } |
54d01ffb | 2564 | break; |
b551a063 DG |
2565 | case LTTNG_DOMAIN_UST: |
2566 | nb_events = ust_app_list_events(events); | |
2567 | if (nb_events < 0) { | |
2568 | ret = LTTCOMM_UST_LIST_FAIL; | |
2569 | goto error; | |
2570 | } | |
2571 | break; | |
54d01ffb | 2572 | default: |
54d01ffb DG |
2573 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2574 | goto error; | |
2575 | } | |
894be886 | 2576 | |
54d01ffb | 2577 | return nb_events; |
7d29a247 | 2578 | |
54d01ffb DG |
2579 | error: |
2580 | /* Return negative value to differentiate return code */ | |
2581 | return -ret; | |
2582 | } | |
b389abbe | 2583 | |
54d01ffb DG |
2584 | /* |
2585 | * Command LTTNG_START_TRACE processed by the client thread. | |
2586 | */ | |
2587 | static int cmd_start_trace(struct ltt_session *session) | |
2588 | { | |
2589 | int ret; | |
54d01ffb | 2590 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2591 | struct ltt_ust_session *usess; |
b389abbe | 2592 | |
54d01ffb DG |
2593 | /* Short cut */ |
2594 | ksession = session->kernel_session; | |
b9d9b220 | 2595 | usess = session->ust_session; |
5eb91c98 | 2596 | |
464dd62d MD |
2597 | if (session->enabled) |
2598 | return LTTCOMM_UST_START_FAIL; | |
2599 | session->enabled = 1; | |
2600 | ||
54d01ffb DG |
2601 | /* Kernel tracing */ |
2602 | if (ksession != NULL) { | |
2bdd86d4 MD |
2603 | struct ltt_kernel_channel *kchan; |
2604 | ||
54d01ffb DG |
2605 | /* Open kernel metadata */ |
2606 | if (ksession->metadata == NULL) { | |
2607 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2608 | if (ret < 0) { | |
2609 | ret = LTTCOMM_KERN_META_FAIL; | |
2610 | goto error; | |
b389abbe | 2611 | } |
54d01ffb | 2612 | } |
7d29a247 | 2613 | |
54d01ffb DG |
2614 | /* Open kernel metadata stream */ |
2615 | if (ksession->metadata_stream_fd == 0) { | |
2616 | ret = kernel_open_metadata_stream(ksession); | |
2617 | if (ret < 0) { | |
2618 | ERR("Kernel create metadata stream failed"); | |
2619 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2620 | goto error; | |
2621 | } | |
2622 | } | |
2623 | ||
2624 | /* For each channel */ | |
2625 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2626 | if (kchan->stream_count == 0) { | |
2627 | ret = kernel_open_channel_stream(kchan); | |
2628 | if (ret < 0) { | |
2629 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2630 | goto error; |
2631 | } | |
54d01ffb DG |
2632 | /* Update the stream global counter */ |
2633 | ksession->stream_count_global += ret; | |
7d29a247 | 2634 | } |
54d01ffb DG |
2635 | } |
2636 | ||
2637 | /* Setup kernel consumer socket and send fds to it */ | |
2638 | ret = init_kernel_tracing(ksession); | |
2639 | if (ret < 0) { | |
2640 | ret = LTTCOMM_KERN_START_FAIL; | |
2641 | goto error; | |
2642 | } | |
2643 | ||
2644 | /* This start the kernel tracing */ | |
2645 | ret = kernel_start_session(ksession); | |
2646 | if (ret < 0) { | |
2647 | ret = LTTCOMM_KERN_START_FAIL; | |
2648 | goto error; | |
2649 | } | |
2650 | ||
2651 | /* Quiescent wait after starting trace */ | |
2652 | kernel_wait_quiescent(kernel_tracer_fd); | |
2653 | } | |
2654 | ||
36dc12cc | 2655 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2656 | if (usess) { |
2657 | usess->start_trace = 1; | |
36dc12cc | 2658 | |
b9d9b220 DG |
2659 | ret = ust_app_start_trace_all(usess); |
2660 | if (ret < 0) { | |
2661 | ret = LTTCOMM_UST_START_FAIL; | |
2662 | goto error; | |
2663 | } | |
2bdd86d4 | 2664 | } |
54d01ffb DG |
2665 | |
2666 | ret = LTTCOMM_OK; | |
2667 | ||
2668 | error: | |
2669 | return ret; | |
2670 | } | |
2671 | ||
2672 | /* | |
2673 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2674 | */ | |
2675 | static int cmd_stop_trace(struct ltt_session *session) | |
2676 | { | |
2677 | int ret; | |
2678 | struct ltt_kernel_channel *kchan; | |
2679 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2680 | struct ltt_ust_session *usess; |
54d01ffb DG |
2681 | |
2682 | /* Short cut */ | |
2683 | ksession = session->kernel_session; | |
8be98f9a | 2684 | usess = session->ust_session; |
54d01ffb | 2685 | |
464dd62d MD |
2686 | if (!session->enabled) |
2687 | return LTTCOMM_UST_START_FAIL; | |
2688 | session->enabled = 0; | |
2689 | ||
54d01ffb DG |
2690 | /* Kernel tracer */ |
2691 | if (ksession != NULL) { | |
2692 | DBG("Stop kernel tracing"); | |
2693 | ||
2694 | /* Flush all buffers before stopping */ | |
2695 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2696 | if (ret < 0) { | |
2697 | ERR("Kernel metadata flush failed"); | |
2698 | } | |
f34daff7 | 2699 | |
54d01ffb DG |
2700 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2701 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2702 | if (ret < 0) { |
54d01ffb | 2703 | ERR("Kernel flush buffer error"); |
7d29a247 | 2704 | } |
54d01ffb | 2705 | } |
19e70852 | 2706 | |
54d01ffb DG |
2707 | ret = kernel_stop_session(ksession); |
2708 | if (ret < 0) { | |
2709 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2710 | goto error; |
f3ed775e | 2711 | } |
54d01ffb DG |
2712 | |
2713 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2714 | } |
54d01ffb | 2715 | |
8be98f9a MD |
2716 | /* Flag session that trace should start automatically */ |
2717 | if (usess) { | |
2718 | usess->start_trace = 0; | |
2bdd86d4 | 2719 | |
8be98f9a | 2720 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2721 | if (ret < 0) { |
8be98f9a | 2722 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2723 | goto error; |
2724 | } | |
2bdd86d4 | 2725 | } |
54d01ffb DG |
2726 | |
2727 | ret = LTTCOMM_OK; | |
2728 | ||
2729 | error: | |
2730 | return ret; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2735 | */ | |
2736 | static int cmd_create_session(char *name, char *path) | |
2737 | { | |
2738 | int ret; | |
2739 | ||
2740 | ret = session_create(name, path); | |
2741 | if (ret != LTTCOMM_OK) { | |
2742 | goto error; | |
2743 | } | |
2744 | ||
2745 | ret = LTTCOMM_OK; | |
2746 | ||
2747 | error: | |
2748 | return ret; | |
2749 | } | |
2750 | ||
2751 | /* | |
2752 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2753 | */ | |
2754 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2755 | { | |
2756 | int ret; | |
2757 | ||
2758 | /* Clean kernel session teardown */ | |
2759 | teardown_kernel_session(session); | |
84cd17c6 MD |
2760 | /* UST session teardown */ |
2761 | teardown_ust_session(session); | |
54d01ffb DG |
2762 | |
2763 | /* | |
2764 | * Must notify the kernel thread here to update it's poll setin order | |
2765 | * to remove the channel(s)' fd just destroyed. | |
2766 | */ | |
2767 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2768 | if (ret < 0) { | |
2769 | perror("write kernel poll pipe"); | |
2770 | } | |
2771 | ||
271933a4 | 2772 | ret = session_destroy(session); |
54d01ffb DG |
2773 | |
2774 | return ret; | |
2775 | } | |
2776 | ||
2777 | /* | |
2778 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2779 | */ | |
2780 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2781 | { | |
2782 | int ret; | |
2783 | ||
2784 | switch (domain) { | |
2785 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2786 | { |
54d01ffb | 2787 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2788 | |
54d01ffb DG |
2789 | kcalibrate.type = calibrate->type; |
2790 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2791 | if (ret < 0) { |
54d01ffb DG |
2792 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2793 | goto error; | |
33a2b854 | 2794 | } |
54d01ffb DG |
2795 | break; |
2796 | } | |
2797 | default: | |
2798 | /* TODO: Userspace tracing */ | |
2799 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2800 | goto error; | |
2801 | } | |
33a2b854 | 2802 | |
54d01ffb | 2803 | ret = LTTCOMM_OK; |
33a2b854 | 2804 | |
54d01ffb DG |
2805 | error: |
2806 | return ret; | |
2807 | } | |
7d29a247 | 2808 | |
54d01ffb DG |
2809 | /* |
2810 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2811 | */ | |
2812 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2813 | char *sock_path) | |
2814 | { | |
2815 | int ret, sock; | |
b389abbe | 2816 | |
54d01ffb DG |
2817 | switch (domain) { |
2818 | case LTTNG_DOMAIN_KERNEL: | |
2819 | /* Can't register a consumer if there is already one */ | |
2820 | if (session->kernel_session->consumer_fd != 0) { | |
2821 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2822 | goto error; | |
2823 | } | |
2824 | ||
2825 | sock = lttcomm_connect_unix_sock(sock_path); | |
2826 | if (sock < 0) { | |
2827 | ret = LTTCOMM_CONNECT_FAIL; | |
2828 | goto error; | |
2829 | } | |
2830 | ||
2831 | session->kernel_session->consumer_fd = sock; | |
2832 | break; | |
2833 | default: | |
2834 | /* TODO: Userspace tracing */ | |
2835 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2836 | goto error; | |
2837 | } | |
2838 | ||
2839 | ret = LTTCOMM_OK; | |
2840 | ||
2841 | error: | |
2842 | return ret; | |
2843 | } | |
2844 | ||
2845 | /* | |
2846 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2847 | */ | |
2848 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2849 | struct lttng_domain **domains) | |
2850 | { | |
b551a063 | 2851 | int ret, index = 0; |
54d01ffb DG |
2852 | ssize_t nb_dom = 0; |
2853 | ||
2854 | if (session->kernel_session != NULL) { | |
b551a063 | 2855 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2856 | nb_dom++; |
2857 | } | |
2858 | ||
b551a063 DG |
2859 | if (session->ust_session != NULL) { |
2860 | DBG3("Listing domains found UST global domain"); | |
2861 | nb_dom++; | |
2862 | } | |
54d01ffb | 2863 | |
b551a063 | 2864 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2865 | if (*domains == NULL) { |
2866 | ret = -LTTCOMM_FATAL; | |
2867 | goto error; | |
2868 | } | |
2869 | ||
b551a063 DG |
2870 | if (session->kernel_session != NULL) { |
2871 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2872 | index++; | |
2873 | } | |
2874 | ||
2875 | if (session->ust_session != NULL) { | |
2876 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2877 | index++; | |
2878 | } | |
54d01ffb | 2879 | |
54d01ffb DG |
2880 | return nb_dom; |
2881 | ||
2882 | error: | |
2883 | return ret; | |
2884 | } | |
2885 | ||
2886 | /* | |
2887 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2888 | */ | |
b551a063 | 2889 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2890 | struct lttng_channel **channels) |
2891 | { | |
2892 | int ret; | |
2893 | ssize_t nb_chan = 0; | |
2894 | ||
b551a063 DG |
2895 | switch (domain) { |
2896 | case LTTNG_DOMAIN_KERNEL: | |
2897 | if (session->kernel_session != NULL) { | |
2898 | nb_chan = session->kernel_session->channel_count; | |
2899 | } | |
0df502fd | 2900 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
2901 | break; |
2902 | case LTTNG_DOMAIN_UST: | |
2903 | if (session->ust_session != NULL) { | |
2904 | nb_chan = hashtable_get_count( | |
2905 | session->ust_session->domain_global.channels); | |
2906 | } | |
0df502fd | 2907 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
2908 | break; |
2909 | default: | |
2910 | *channels = NULL; | |
2911 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2912 | goto error; |
2913 | } | |
2914 | ||
b551a063 DG |
2915 | if (nb_chan > 0) { |
2916 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2917 | if (*channels == NULL) { | |
2918 | ret = -LTTCOMM_FATAL; | |
2919 | goto error; | |
2920 | } | |
54d01ffb | 2921 | |
b551a063 DG |
2922 | list_lttng_channels(domain, session, *channels); |
2923 | } else { | |
2924 | *channels = NULL; | |
2925 | } | |
2bdd86d4 | 2926 | |
54d01ffb DG |
2927 | return nb_chan; |
2928 | ||
2929 | error: | |
2930 | return ret; | |
2931 | } | |
2932 | ||
2933 | /* | |
2934 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2935 | */ | |
b551a063 | 2936 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
2937 | char *channel_name, struct lttng_event **events) |
2938 | { | |
b551a063 | 2939 | int ret = 0; |
54d01ffb | 2940 | ssize_t nb_event = 0; |
54d01ffb | 2941 | |
b551a063 DG |
2942 | switch (domain) { |
2943 | case LTTNG_DOMAIN_KERNEL: | |
2944 | if (session->kernel_session != NULL) { | |
2945 | nb_event = list_lttng_kernel_events(channel_name, | |
2946 | session->kernel_session, events); | |
54d01ffb | 2947 | } |
b551a063 DG |
2948 | break; |
2949 | case LTTNG_DOMAIN_UST: | |
2950 | { | |
2951 | if (session->ust_session != NULL) { | |
2952 | nb_event = list_lttng_ust_global_events(channel_name, | |
2953 | &session->ust_session->domain_global, events); | |
2954 | } | |
2955 | break; | |
54d01ffb | 2956 | } |
b551a063 DG |
2957 | default: |
2958 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2959 | goto error; |
2960 | } | |
2961 | ||
b551a063 | 2962 | ret = nb_event; |
54d01ffb DG |
2963 | |
2964 | error: | |
2965 | return ret; | |
2966 | } | |
2967 | ||
2968 | /* | |
2969 | * Process the command requested by the lttng client within the command | |
2970 | * context structure. This function make sure that the return structure (llm) | |
2971 | * is set and ready for transmission before returning. | |
2972 | * | |
2973 | * Return any error encountered or 0 for success. | |
2974 | */ | |
2975 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2976 | { | |
2977 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2978 | int need_tracing_session = 1; |
54d01ffb DG |
2979 | |
2980 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2981 | ||
2982 | /* | |
2983 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2984 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2985 | * command. |
2986 | */ | |
2987 | switch(cmd_ctx->lsm->cmd_type) { | |
2988 | case LTTNG_LIST_SESSIONS: | |
2989 | case LTTNG_LIST_TRACEPOINTS: | |
2990 | case LTTNG_LIST_DOMAINS: | |
2991 | case LTTNG_LIST_CHANNELS: | |
2992 | case LTTNG_LIST_EVENTS: | |
2993 | break; | |
2994 | default: | |
2995 | /* Setup lttng message with no payload */ | |
2996 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2997 | if (ret < 0) { | |
2998 | /* This label does not try to unlock the session */ | |
2999 | goto init_setup_error; | |
3000 | } | |
3001 | } | |
3002 | ||
3003 | /* Commands that DO NOT need a session. */ | |
3004 | switch (cmd_ctx->lsm->cmd_type) { | |
3005 | case LTTNG_CALIBRATE: | |
3006 | case LTTNG_CREATE_SESSION: | |
3007 | case LTTNG_LIST_SESSIONS: | |
3008 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3009 | need_tracing_session = 0; |
54d01ffb DG |
3010 | break; |
3011 | default: | |
3012 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3013 | session_lock_list(); |
54d01ffb | 3014 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3015 | session_unlock_list(); |
54d01ffb DG |
3016 | if (cmd_ctx->session == NULL) { |
3017 | if (cmd_ctx->lsm->session.name != NULL) { | |
3018 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3019 | } else { | |
3020 | /* If no session name specified */ | |
3021 | ret = LTTCOMM_SELECT_SESS; | |
3022 | } | |
3023 | goto error; | |
3024 | } else { | |
3025 | /* Acquire lock for the session */ | |
3026 | session_lock(cmd_ctx->session); | |
3027 | } | |
3028 | break; | |
3029 | } | |
b389abbe | 3030 | |
54d01ffb DG |
3031 | /* |
3032 | * Check domain type for specific "pre-action". | |
3033 | */ | |
3034 | switch (cmd_ctx->lsm->domain.type) { | |
3035 | case LTTNG_DOMAIN_KERNEL: | |
3036 | /* Kernel tracer check */ | |
3037 | if (kernel_tracer_fd == 0) { | |
3038 | /* Basically, load kernel tracer modules */ | |
3039 | init_kernel_tracer(); | |
3040 | if (kernel_tracer_fd == 0) { | |
3041 | ret = LTTCOMM_KERN_NA; | |
3042 | goto error; | |
3043 | } | |
3044 | } | |
5eb91c98 | 3045 | |
54d01ffb | 3046 | /* Need a session for kernel command */ |
44d3bd01 | 3047 | if (need_tracing_session) { |
54d01ffb DG |
3048 | if (cmd_ctx->session->kernel_session == NULL) { |
3049 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3050 | if (ret < 0) { |
54d01ffb | 3051 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3052 | goto error; |
3053 | } | |
b389abbe | 3054 | } |
7d29a247 | 3055 | |
54d01ffb | 3056 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3057 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3058 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3059 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3060 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3061 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3062 | if (ret < 0) { |
54d01ffb DG |
3063 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3064 | goto error; | |
950131af | 3065 | } |
3ff2ecac MD |
3066 | } else { |
3067 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3068 | } |
0d0c377a | 3069 | } |
54d01ffb | 3070 | break; |
2bdd86d4 | 3071 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3072 | { |
44d3bd01 | 3073 | if (need_tracing_session) { |
f6a9efaa | 3074 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3075 | ret = create_ust_session(cmd_ctx->session, |
3076 | &cmd_ctx->lsm->domain); | |
3077 | if (ret != LTTCOMM_OK) { | |
3078 | goto error; | |
3079 | } | |
3080 | } | |
7753dea8 MD |
3081 | /* Start the UST consumer daemons */ |
3082 | /* 64-bit */ | |
3083 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
3084 | if (consumerd64_bindir[0] != '\0' && | |
3085 | ustconsumer64_data.pid == 0 && | |
2bdd86d4 | 3086 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3087 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3088 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3089 | if (ret < 0) { |
7753dea8 MD |
3090 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3091 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3092 | goto error; |
3093 | } | |
48842b30 | 3094 | |
7753dea8 | 3095 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3096 | } else { |
7753dea8 MD |
3097 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3098 | } | |
3099 | /* 32-bit */ | |
3100 | if (consumerd32_bindir[0] != '\0' && | |
3101 | ustconsumer32_data.pid == 0 && | |
3102 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3103 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3104 | ret = start_consumerd(&ustconsumer32_data); | |
3105 | if (ret < 0) { | |
3106 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3107 | ust_consumerd32_fd = -EINVAL; | |
3108 | goto error; | |
3109 | } | |
3110 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3111 | } else { | |
3112 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3113 | } |
44d3bd01 DG |
3114 | } |
3115 | break; | |
48842b30 | 3116 | } |
54d01ffb | 3117 | default: |
54d01ffb DG |
3118 | break; |
3119 | } | |
33a2b854 | 3120 | |
54d01ffb DG |
3121 | /* Process by command type */ |
3122 | switch (cmd_ctx->lsm->cmd_type) { | |
3123 | case LTTNG_ADD_CONTEXT: | |
3124 | { | |
3125 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3126 | cmd_ctx->lsm->u.context.channel_name, | |
3127 | cmd_ctx->lsm->u.context.event_name, | |
3128 | &cmd_ctx->lsm->u.context.ctx); | |
3129 | break; | |
3130 | } | |
3131 | case LTTNG_DISABLE_CHANNEL: | |
3132 | { | |
3133 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3134 | cmd_ctx->lsm->u.disable.channel_name); | |
3135 | break; | |
3136 | } | |
3137 | case LTTNG_DISABLE_EVENT: | |
3138 | { | |
3139 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3140 | cmd_ctx->lsm->u.disable.channel_name, | |
3141 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3142 | ret = LTTCOMM_OK; |
3143 | break; | |
3144 | } | |
54d01ffb DG |
3145 | case LTTNG_DISABLE_ALL_EVENT: |
3146 | { | |
2bdd86d4 | 3147 | DBG("Disabling all events"); |
54d01ffb DG |
3148 | |
3149 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3150 | cmd_ctx->lsm->u.disable.channel_name); | |
3151 | break; | |
3152 | } | |
3153 | case LTTNG_ENABLE_CHANNEL: | |
3154 | { | |
44d3bd01 | 3155 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
3156 | &cmd_ctx->lsm->u.channel.chan); |
3157 | break; | |
3158 | } | |
3159 | case LTTNG_ENABLE_EVENT: | |
3160 | { | |
3161 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3162 | cmd_ctx->lsm->u.enable.channel_name, | |
3163 | &cmd_ctx->lsm->u.enable.event); | |
3164 | break; | |
3165 | } | |
3166 | case LTTNG_ENABLE_ALL_EVENT: | |
3167 | { | |
2bdd86d4 | 3168 | DBG("Enabling all events"); |
54d01ffb DG |
3169 | |
3170 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3171 | cmd_ctx->lsm->u.enable.channel_name, |
3172 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3173 | break; |
3174 | } | |
052da939 | 3175 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3176 | { |
9f19cc17 | 3177 | struct lttng_event *events; |
54d01ffb | 3178 | ssize_t nb_events; |
052da939 | 3179 | |
54d01ffb DG |
3180 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3181 | if (nb_events < 0) { | |
3182 | ret = -nb_events; | |
3183 | goto error; | |
2ef84c95 DG |
3184 | } |
3185 | ||
3186 | /* | |
3187 | * Setup lttng message with payload size set to the event list size in | |
3188 | * bytes and then copy list into the llm payload. | |
3189 | */ | |
052da939 | 3190 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3191 | if (ret < 0) { |
052da939 | 3192 | free(events); |
2ef84c95 DG |
3193 | goto setup_error; |
3194 | } | |
3195 | ||
3196 | /* Copy event list into message payload */ | |
9f19cc17 | 3197 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3198 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3199 | |
9f19cc17 | 3200 | free(events); |
2ef84c95 DG |
3201 | |
3202 | ret = LTTCOMM_OK; | |
3203 | break; | |
3204 | } | |
f3ed775e | 3205 | case LTTNG_START_TRACE: |
8c0faa1d | 3206 | { |
54d01ffb | 3207 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3208 | break; |
3209 | } | |
f3ed775e | 3210 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3211 | { |
54d01ffb | 3212 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3213 | break; |
3214 | } | |
5e16da05 MD |
3215 | case LTTNG_CREATE_SESSION: |
3216 | { | |
54d01ffb DG |
3217 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3218 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3219 | break; |
3220 | } | |
3221 | case LTTNG_DESTROY_SESSION: | |
3222 | { | |
54d01ffb DG |
3223 | ret = cmd_destroy_session(cmd_ctx->session, |
3224 | cmd_ctx->lsm->session.name); | |
5461b305 | 3225 | break; |
5e16da05 | 3226 | } |
9f19cc17 | 3227 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3228 | { |
54d01ffb DG |
3229 | ssize_t nb_dom; |
3230 | struct lttng_domain *domains; | |
5461b305 | 3231 | |
54d01ffb DG |
3232 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3233 | if (nb_dom < 0) { | |
3234 | ret = -nb_dom; | |
3235 | goto error; | |
ce3d728c | 3236 | } |
520ff687 | 3237 | |
54d01ffb | 3238 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3239 | if (ret < 0) { |
3240 | goto setup_error; | |
520ff687 | 3241 | } |
57167058 | 3242 | |
54d01ffb DG |
3243 | /* Copy event list into message payload */ |
3244 | memcpy(cmd_ctx->llm->payload, domains, | |
3245 | nb_dom * sizeof(struct lttng_domain)); | |
3246 | ||
3247 | free(domains); | |
5e16da05 | 3248 | |
5461b305 | 3249 | ret = LTTCOMM_OK; |
5e16da05 MD |
3250 | break; |
3251 | } | |
9f19cc17 | 3252 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3253 | { |
54d01ffb DG |
3254 | size_t nb_chan; |
3255 | struct lttng_channel *channels; | |
3256 | ||
b551a063 DG |
3257 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3258 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3259 | if (nb_chan < 0) { |
3260 | ret = -nb_chan; | |
3261 | goto error; | |
5461b305 | 3262 | } |
ca95a216 | 3263 | |
54d01ffb | 3264 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3265 | if (ret < 0) { |
3266 | goto setup_error; | |
3267 | } | |
9f19cc17 | 3268 | |
54d01ffb DG |
3269 | /* Copy event list into message payload */ |
3270 | memcpy(cmd_ctx->llm->payload, channels, | |
3271 | nb_chan * sizeof(struct lttng_channel)); | |
3272 | ||
3273 | free(channels); | |
9f19cc17 DG |
3274 | |
3275 | ret = LTTCOMM_OK; | |
5461b305 | 3276 | break; |
5e16da05 | 3277 | } |
9f19cc17 | 3278 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3279 | { |
b551a063 | 3280 | ssize_t nb_event; |
684d34d2 | 3281 | struct lttng_event *events = NULL; |
9f19cc17 | 3282 | |
b551a063 | 3283 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3284 | cmd_ctx->lsm->u.list.channel_name, &events); |
3285 | if (nb_event < 0) { | |
3286 | ret = -nb_event; | |
3287 | goto error; | |
5461b305 | 3288 | } |
ca95a216 | 3289 | |
54d01ffb | 3290 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3291 | if (ret < 0) { |
3292 | goto setup_error; | |
3293 | } | |
9f19cc17 | 3294 | |
54d01ffb DG |
3295 | /* Copy event list into message payload */ |
3296 | memcpy(cmd_ctx->llm->payload, events, | |
3297 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3298 | |
54d01ffb | 3299 | free(events); |
9f19cc17 DG |
3300 | |
3301 | ret = LTTCOMM_OK; | |
5461b305 | 3302 | break; |
5e16da05 MD |
3303 | } |
3304 | case LTTNG_LIST_SESSIONS: | |
3305 | { | |
54d01ffb | 3306 | session_lock_list(); |
5461b305 | 3307 | |
6c9cc2ab | 3308 | if (session_list_ptr->count == 0) { |
f3ed775e | 3309 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3310 | session_unlock_list(); |
5461b305 | 3311 | goto error; |
57167058 | 3312 | } |
5e16da05 | 3313 | |
6c9cc2ab DG |
3314 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3315 | session_list_ptr->count); | |
5461b305 | 3316 | if (ret < 0) { |
54d01ffb | 3317 | session_unlock_list(); |
5461b305 | 3318 | goto setup_error; |
e065084a | 3319 | } |
5e16da05 | 3320 | |
6c9cc2ab DG |
3321 | /* Filled the session array */ |
3322 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3323 | ||
54d01ffb | 3324 | session_unlock_list(); |
5e16da05 | 3325 | |
5461b305 | 3326 | ret = LTTCOMM_OK; |
5e16da05 MD |
3327 | break; |
3328 | } | |
d0254c7c MD |
3329 | case LTTNG_CALIBRATE: |
3330 | { | |
54d01ffb DG |
3331 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3332 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3333 | break; |
3334 | } | |
d9800920 DG |
3335 | case LTTNG_REGISTER_CONSUMER: |
3336 | { | |
54d01ffb DG |
3337 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3338 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3339 | break; |
3340 | } | |
5e16da05 | 3341 | default: |
5e16da05 | 3342 | ret = LTTCOMM_UND; |
5461b305 | 3343 | break; |
fac6795d DG |
3344 | } |
3345 | ||
5461b305 | 3346 | error: |
5461b305 DG |
3347 | if (cmd_ctx->llm == NULL) { |
3348 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3349 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3350 | goto setup_error; |
3351 | } | |
3352 | } | |
54d01ffb | 3353 | /* Set return code */ |
5461b305 | 3354 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3355 | setup_error: |
b5541356 | 3356 | if (cmd_ctx->session) { |
54d01ffb | 3357 | session_unlock(cmd_ctx->session); |
b5541356 | 3358 | } |
54d01ffb | 3359 | init_setup_error: |
8028d920 | 3360 | return ret; |
fac6795d DG |
3361 | } |
3362 | ||
1d4b027a | 3363 | /* |
d063d709 DG |
3364 | * This thread manage all clients request using the unix client socket for |
3365 | * communication. | |
1d4b027a DG |
3366 | */ |
3367 | static void *thread_manage_clients(void *data) | |
3368 | { | |
5eb91c98 DG |
3369 | int sock = 0, ret, i, pollfd; |
3370 | uint32_t revents, nb_fd; | |
273ea72c | 3371 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3372 | struct lttng_poll_event events; |
1d4b027a DG |
3373 | |
3374 | DBG("[thread] Manage client started"); | |
3375 | ||
f6a9efaa DG |
3376 | rcu_register_thread(); |
3377 | ||
1d4b027a DG |
3378 | ret = lttcomm_listen_unix_sock(client_sock); |
3379 | if (ret < 0) { | |
3380 | goto error; | |
3381 | } | |
3382 | ||
5eb91c98 DG |
3383 | /* |
3384 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3385 | * more will be added to this poll set. | |
3386 | */ | |
3387 | ret = create_thread_poll_set(&events, 2); | |
3388 | if (ret < 0) { | |
3389 | goto error; | |
3390 | } | |
273ea72c | 3391 | |
5eb91c98 DG |
3392 | /* Add the application registration socket */ |
3393 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3394 | if (ret < 0) { | |
3395 | goto error; | |
3396 | } | |
273ea72c | 3397 | |
bbd973c2 DG |
3398 | /* |
3399 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3400 | */ |
3401 | if (opt_sig_parent) { | |
3402 | kill(ppid, SIGCHLD); | |
3403 | } | |
3404 | ||
3405 | while (1) { | |
1d4b027a | 3406 | DBG("Accepting client command ..."); |
273ea72c | 3407 | |
5eb91c98 DG |
3408 | nb_fd = LTTNG_POLL_GETNB(&events); |
3409 | ||
273ea72c | 3410 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3411 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3412 | if (ret < 0) { |
273ea72c DG |
3413 | goto error; |
3414 | } | |
3415 | ||
5eb91c98 DG |
3416 | for (i = 0; i < nb_fd; i++) { |
3417 | /* Fetch once the poll data */ | |
3418 | revents = LTTNG_POLL_GETEV(&events, i); | |
3419 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3420 | ||
3421 | /* Thread quit pipe has been closed. Killing thread. */ | |
3422 | ret = check_thread_quit_pipe(pollfd, revents); | |
3423 | if (ret) { | |
3424 | goto error; | |
3425 | } | |
3426 | ||
3427 | /* Event on the registration socket */ | |
3428 | if (pollfd == client_sock) { | |
3429 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3430 | ERR("Client socket poll error"); | |
3431 | goto error; | |
3432 | } | |
3433 | } | |
3434 | } | |
3435 | ||
3436 | DBG("Wait for client response"); | |
3437 | ||
3438 | sock = lttcomm_accept_unix_sock(client_sock); | |
3439 | if (sock < 0) { | |
273ea72c | 3440 | goto error; |
273ea72c DG |
3441 | } |
3442 | ||
5eb91c98 | 3443 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3444 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3445 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3446 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3447 | goto error; |
5eb91c98 | 3448 | } |
1d4b027a | 3449 | |
5eb91c98 | 3450 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3451 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3452 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3453 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3454 | goto error; |
3455 | } | |
1d4b027a | 3456 | |
5eb91c98 DG |
3457 | cmd_ctx->llm = NULL; |
3458 | cmd_ctx->session = NULL; | |
1d4b027a | 3459 | |
5eb91c98 DG |
3460 | /* |
3461 | * Data is received from the lttng client. The struct | |
3462 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3463 | * the client. | |
3464 | */ | |
3465 | DBG("Receiving data from client ..."); | |
3466 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3467 | sizeof(struct lttcomm_session_msg)); | |
3468 | if (ret <= 0) { | |
3469 | DBG("Nothing recv() from client... continuing"); | |
3470 | close(sock); | |
3471 | free(cmd_ctx); | |
3472 | continue; | |
3473 | } | |
1d4b027a | 3474 | |
5eb91c98 DG |
3475 | // TODO: Validate cmd_ctx including sanity check for |
3476 | // security purpose. | |
f7776ea7 | 3477 | |
f6a9efaa | 3478 | rcu_thread_online(); |
5eb91c98 DG |
3479 | /* |
3480 | * This function dispatch the work to the kernel or userspace tracer | |
3481 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3482 | * informations for the client. The command context struct contains | |
3483 | * everything this function may needs. | |
3484 | */ | |
3485 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3486 | rcu_thread_offline(); |
5eb91c98 | 3487 | if (ret < 0) { |
bbd973c2 | 3488 | /* |
5eb91c98 | 3489 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3490 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3491 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3492 | */ |
bbd973c2 | 3493 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3494 | continue; |
3495 | } | |
d6e4fca4 | 3496 | |
54d01ffb DG |
3497 | DBG("Sending response (size: %d, retcode: %s)", |
3498 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3499 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3500 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3501 | if (ret < 0) { |
3502 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3503 | } |
1d4b027a | 3504 | |
5eb91c98 DG |
3505 | clean_command_ctx(&cmd_ctx); |
3506 | ||
3507 | /* End of transmission */ | |
273ea72c DG |
3508 | close(sock); |
3509 | } | |
3510 | ||
5eb91c98 DG |
3511 | error: |
3512 | DBG("Client thread dying"); | |
273ea72c | 3513 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3514 | close(client_sock); |
3515 | close(sock); | |
273ea72c | 3516 | |
5eb91c98 | 3517 | lttng_poll_clean(&events); |
a2fb29a5 | 3518 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3519 | |
3520 | rcu_unregister_thread(); | |
1d4b027a DG |
3521 | return NULL; |
3522 | } | |
3523 | ||
3524 | ||
fac6795d DG |
3525 | /* |
3526 | * usage function on stderr | |
3527 | */ | |
3528 | static void usage(void) | |
3529 | { | |
b716ce68 | 3530 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3531 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3532 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3533 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3534 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3535 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3536 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3537 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3538 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3539 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
3540 | fprintf(stderr, " --ustconsumerd32 PATH Specify path for the 32-bit UST consumer daemon binary\n"); | |
3541 | fprintf(stderr, " --ustconsumerd64 PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
d6f42150 DG |
3542 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3543 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3544 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3545 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3546 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3547 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3548 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3549 | } |
3550 | ||
3551 | /* | |
3552 | * daemon argument parsing | |
3553 | */ | |
3554 | static int parse_args(int argc, char **argv) | |
3555 | { | |
3556 | int c; | |
3557 | ||
3558 | static struct option long_options[] = { | |
3559 | { "client-sock", 1, 0, 'c' }, | |
3560 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3561 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3562 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3563 | { "ustconsumerd64", 1, 0, 't' }, |
3564 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
3565 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3566 | { "ustconsumerd32", 1, 0, 'u' }, | |
3567 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
3568 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
fac6795d | 3569 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3570 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3571 | { "help", 0, 0, 'h' }, |
3572 | { "group", 1, 0, 'g' }, | |
3573 | { "version", 0, 0, 'V' }, | |
75462a81 | 3574 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3575 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3576 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3577 | { NULL, 0, 0, 0 } |
3578 | }; | |
3579 | ||
3580 | while (1) { | |
3581 | int option_index = 0; | |
7753dea8 | 3582 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3583 | long_options, &option_index); |
fac6795d DG |
3584 | if (c == -1) { |
3585 | break; | |
3586 | } | |
3587 | ||
3588 | switch (c) { | |
3589 | case 0: | |
3590 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3591 | if (optarg) { | |
3592 | fprintf(stderr, " with arg %s\n", optarg); | |
3593 | } | |
3594 | break; | |
b716ce68 | 3595 | case 'c': |
fac6795d DG |
3596 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3597 | break; | |
3598 | case 'a': | |
3599 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3600 | break; | |
3601 | case 'd': | |
3602 | opt_daemon = 1; | |
3603 | break; | |
3604 | case 'g': | |
fb09408a | 3605 | opt_tracing_group = optarg; |
fac6795d DG |
3606 | break; |
3607 | case 'h': | |
3608 | usage(); | |
3609 | exit(EXIT_FAILURE); | |
3610 | case 'V': | |
3611 | fprintf(stdout, "%s\n", VERSION); | |
3612 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3613 | case 'S': |
3614 | opt_sig_parent = 1; | |
3615 | break; | |
d6f42150 | 3616 | case 'E': |
3bd1e081 | 3617 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3618 | break; |
3619 | case 'C': | |
3bd1e081 MD |
3620 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3621 | break; | |
3622 | case 'F': | |
7753dea8 | 3623 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3624 | break; |
3625 | case 'D': | |
7753dea8 MD |
3626 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3627 | break; | |
3628 | case 'H': | |
3629 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3630 | break; | |
3631 | case 'G': | |
3632 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3633 | break; |
75462a81 DG |
3634 | case 'q': |
3635 | opt_quiet = 1; | |
3636 | break; | |
3f9947db | 3637 | case 'v': |
53086306 DG |
3638 | /* Verbose level can increase using multiple -v */ |
3639 | opt_verbose += 1; | |
3f9947db | 3640 | break; |
31f73cc9 | 3641 | case 'Z': |
3bd1e081 | 3642 | opt_verbose_consumer += 1; |
31f73cc9 | 3643 | break; |
fb09408a | 3644 | case 'u': |
7753dea8 MD |
3645 | consumerd32_bindir = optarg; |
3646 | break; | |
3647 | case 't': | |
3648 | consumerd64_bindir = optarg; | |
fb09408a | 3649 | break; |
fac6795d DG |
3650 | default: |
3651 | /* Unknown option or other error. | |
3652 | * Error is printed by getopt, just return */ | |
3653 | return -1; | |
3654 | } | |
3655 | } | |
3656 | ||
3657 | return 0; | |
3658 | } | |
3659 | ||
3660 | /* | |
d063d709 | 3661 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3662 | * apps_sock - The communication socket for all UST apps. |
3663 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3664 | */ |
cf3af59e | 3665 | static int init_daemon_socket(void) |
fac6795d DG |
3666 | { |
3667 | int ret = 0; | |
3668 | mode_t old_umask; | |
3669 | ||
3670 | old_umask = umask(0); | |
3671 | ||
3672 | /* Create client tool unix socket */ | |
d6f42150 DG |
3673 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3674 | if (client_sock < 0) { | |
3675 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3676 | ret = -1; |
3677 | goto end; | |
3678 | } | |
3679 | ||
3680 | /* File permission MUST be 660 */ | |
3681 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3682 | if (ret < 0) { | |
d6f42150 | 3683 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3684 | perror("chmod"); |
3685 | goto end; | |
3686 | } | |
3687 | ||
3688 | /* Create the application unix socket */ | |
d6f42150 DG |
3689 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3690 | if (apps_sock < 0) { | |
3691 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3692 | ret = -1; |
3693 | goto end; | |
3694 | } | |
3695 | ||
d6f42150 | 3696 | /* File permission MUST be 666 */ |
54d01ffb DG |
3697 | ret = chmod(apps_unix_sock_path, |
3698 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3699 | if (ret < 0) { |
d6f42150 | 3700 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3701 | perror("chmod"); |
3702 | goto end; | |
3703 | } | |
3704 | ||
3705 | end: | |
3706 | umask(old_umask); | |
3707 | return ret; | |
3708 | } | |
3709 | ||
3710 | /* | |
54d01ffb DG |
3711 | * Check if the global socket is available, and if a daemon is answering at the |
3712 | * other side. If yes, error is returned. | |
fac6795d | 3713 | */ |
cf3af59e | 3714 | static int check_existing_daemon(void) |
fac6795d | 3715 | { |
7d8234d9 | 3716 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3717 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3718 | return 0; |
099e26bd | 3719 | } |
54d01ffb | 3720 | |
7d8234d9 | 3721 | /* Is there anybody out there ? */ |
099e26bd | 3722 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3723 | return -EEXIST; |
099e26bd | 3724 | } else { |
7d8234d9 | 3725 | return 0; |
099e26bd | 3726 | } |
fac6795d DG |
3727 | } |
3728 | ||
fac6795d | 3729 | /* |
d063d709 | 3730 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3731 | * |
d063d709 DG |
3732 | * Race window between mkdir and chown is OK because we are going from more |
3733 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3734 | */ |
d6f42150 | 3735 | static int set_permissions(void) |
fac6795d DG |
3736 | { |
3737 | int ret; | |
996b65c8 | 3738 | gid_t gid; |
fac6795d | 3739 | |
996b65c8 MD |
3740 | gid = allowed_group(); |
3741 | if (gid < 0) { | |
a463f419 DG |
3742 | if (is_root) { |
3743 | WARN("No tracing group detected"); | |
3744 | ret = 0; | |
3745 | } else { | |
3746 | ERR("Missing tracing group. Aborting execution."); | |
3747 | ret = -1; | |
3748 | } | |
fac6795d DG |
3749 | goto end; |
3750 | } | |
3751 | ||
d6f42150 | 3752 | /* Set lttng run dir */ |
996b65c8 | 3753 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3754 | if (ret < 0) { |
3755 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3756 | perror("chown"); | |
3757 | } | |
3758 | ||
3759 | /* lttng client socket path */ | |
996b65c8 | 3760 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3761 | if (ret < 0) { |
d6f42150 DG |
3762 | ERR("Unable to set group on %s", client_unix_sock_path); |
3763 | perror("chown"); | |
3764 | } | |
3765 | ||
3bd1e081 MD |
3766 | /* kconsumer error socket path */ |
3767 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3768 | if (ret < 0) { |
3bd1e081 MD |
3769 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3770 | perror("chown"); | |
3771 | } | |
3772 | ||
7753dea8 MD |
3773 | /* 64-bit ustconsumer error socket path */ |
3774 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3775 | if (ret < 0) { | |
3776 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
3777 | perror("chown"); | |
3778 | } | |
3779 | ||
3780 | /* 32-bit ustconsumer compat32 error socket path */ | |
3781 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3782 | if (ret < 0) { |
7753dea8 | 3783 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
3784 | perror("chown"); |
3785 | } | |
3786 | ||
d6f42150 | 3787 | DBG("All permissions are set"); |
e07ae692 | 3788 | |
fac6795d DG |
3789 | end: |
3790 | return ret; | |
3791 | } | |
3792 | ||
7a485870 | 3793 | /* |
d063d709 | 3794 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3795 | */ |
3796 | static int create_kernel_poll_pipe(void) | |
3797 | { | |
3798 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3799 | } | |
3800 | ||
099e26bd DG |
3801 | /* |
3802 | * Create the application command pipe to wake thread_manage_apps. | |
3803 | */ | |
3804 | static int create_apps_cmd_pipe(void) | |
3805 | { | |
3806 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3807 | } | |
3808 | ||
d6f42150 | 3809 | /* |
d063d709 | 3810 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3811 | */ |
3812 | static int create_lttng_rundir(void) | |
3813 | { | |
3814 | int ret; | |
3815 | ||
3816 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3817 | if (ret < 0) { | |
b1f11e69 DG |
3818 | if (errno != EEXIST) { |
3819 | ERR("Unable to create " LTTNG_RUNDIR); | |
3820 | goto error; | |
3821 | } else { | |
3822 | ret = 0; | |
3823 | } | |
d6f42150 DG |
3824 | } |
3825 | ||
3826 | error: | |
3827 | return ret; | |
3828 | } | |
3829 | ||
3830 | /* | |
d063d709 DG |
3831 | * Setup sockets and directory needed by the kconsumerd communication with the |
3832 | * session daemon. | |
d6f42150 | 3833 | */ |
3bd1e081 | 3834 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3835 | { |
3836 | int ret; | |
7753dea8 | 3837 | const char *path; |
d6f42150 | 3838 | |
7753dea8 MD |
3839 | switch (consumer_data->type) { |
3840 | case LTTNG_CONSUMER_KERNEL: | |
3841 | path = KCONSUMERD_PATH; | |
3842 | break; | |
3843 | case LTTNG_CONSUMER64_UST: | |
3844 | path = USTCONSUMERD64_PATH; | |
3845 | break; | |
3846 | case LTTNG_CONSUMER32_UST: | |
3847 | path = USTCONSUMERD32_PATH; | |
3848 | break; | |
3849 | default: | |
3850 | ERR("Consumer type unknown"); | |
3851 | ret = -EINVAL; | |
3852 | goto error; | |
d6f42150 DG |
3853 | } |
3854 | ||
3bd1e081 | 3855 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3856 | if (ret < 0) { |
6beb2242 | 3857 | if (errno != EEXIST) { |
3bd1e081 | 3858 | ERR("Failed to create %s", path); |
6beb2242 DG |
3859 | goto error; |
3860 | } | |
3861 | ret = 0; | |
d6f42150 DG |
3862 | } |
3863 | ||
3864 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3865 | consumer_data->err_sock = |
3866 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3867 | if (consumer_data->err_sock < 0) { | |
3868 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3869 | ret = -1; |
3870 | goto error; | |
3871 | } | |
3872 | ||
3873 | /* File permission MUST be 660 */ | |
3bd1e081 | 3874 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3875 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3876 | if (ret < 0) { |
3bd1e081 | 3877 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3878 | perror("chmod"); |
3879 | goto error; | |
3880 | } | |
3881 | ||
3882 | error: | |
3883 | return ret; | |
3884 | } | |
3885 | ||
fac6795d | 3886 | /* |
d063d709 | 3887 | * Signal handler for the daemon |
cf3af59e | 3888 | * |
54d01ffb DG |
3889 | * Simply stop all worker threads, leaving main() return gracefully after |
3890 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3891 | */ |
3892 | static void sighandler(int sig) | |
3893 | { | |
3894 | switch (sig) { | |
cf3af59e MD |
3895 | case SIGPIPE: |
3896 | DBG("SIGPIPE catched"); | |
3897 | return; | |
3898 | case SIGINT: | |
3899 | DBG("SIGINT catched"); | |
3900 | stop_threads(); | |
3901 | break; | |
3902 | case SIGTERM: | |
3903 | DBG("SIGTERM catched"); | |
3904 | stop_threads(); | |
3905 | break; | |
3906 | default: | |
3907 | break; | |
fac6795d | 3908 | } |
fac6795d DG |
3909 | } |
3910 | ||
3911 | /* | |
d063d709 | 3912 | * Setup signal handler for : |
1d4b027a | 3913 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3914 | */ |
1d4b027a | 3915 | static int set_signal_handler(void) |
fac6795d | 3916 | { |
1d4b027a DG |
3917 | int ret = 0; |
3918 | struct sigaction sa; | |
3919 | sigset_t sigset; | |
fac6795d | 3920 | |
1d4b027a DG |
3921 | if ((ret = sigemptyset(&sigset)) < 0) { |
3922 | perror("sigemptyset"); | |
3923 | return ret; | |
3924 | } | |
d6f42150 | 3925 | |
1d4b027a DG |
3926 | sa.sa_handler = sighandler; |
3927 | sa.sa_mask = sigset; | |
3928 | sa.sa_flags = 0; | |
3929 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3930 | perror("sigaction"); | |
3931 | return ret; | |
d6f42150 DG |
3932 | } |
3933 | ||
1d4b027a DG |
3934 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3935 | perror("sigaction"); | |
3936 | return ret; | |
d6f42150 | 3937 | } |
aaf26714 | 3938 | |
1d4b027a DG |
3939 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3940 | perror("sigaction"); | |
3941 | return ret; | |
8c0faa1d DG |
3942 | } |
3943 | ||
1d4b027a DG |
3944 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3945 | ||
3946 | return ret; | |
fac6795d DG |
3947 | } |
3948 | ||
f3ed775e | 3949 | /* |
d063d709 DG |
3950 | * Set open files limit to unlimited. This daemon can open a large number of |
3951 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3952 | */ |
3953 | static void set_ulimit(void) | |
3954 | { | |
3955 | int ret; | |
3956 | struct rlimit lim; | |
3957 | ||
a88df331 | 3958 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3959 | lim.rlim_cur = 65535; |
3960 | lim.rlim_max = 65535; | |
3961 | ||
3962 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3963 | if (ret < 0) { | |
3964 | perror("failed to set open files limit"); | |
3965 | } | |
3966 | } | |
3967 | ||
fac6795d DG |
3968 | /* |
3969 | * main | |
3970 | */ | |
3971 | int main(int argc, char **argv) | |
3972 | { | |
fac6795d DG |
3973 | int ret = 0; |
3974 | void *status; | |
b082db07 | 3975 | const char *home_path; |
fac6795d | 3976 | |
f6a9efaa DG |
3977 | rcu_register_thread(); |
3978 | ||
273ea72c | 3979 | /* Create thread quit pipe */ |
cf3af59e MD |
3980 | if ((ret = init_thread_quit_pipe()) < 0) { |
3981 | goto error; | |
273ea72c DG |
3982 | } |
3983 | ||
7753dea8 | 3984 | setup_consumerd_path(); |
fb09408a | 3985 | |
fac6795d DG |
3986 | /* Parse arguments */ |
3987 | progname = argv[0]; | |
3988 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3989 | goto error; |
fac6795d DG |
3990 | } |
3991 | ||
3992 | /* Daemonize */ | |
3993 | if (opt_daemon) { | |
53094c05 DG |
3994 | ret = daemon(0, 0); |
3995 | if (ret < 0) { | |
3996 | perror("daemon"); | |
cf3af59e | 3997 | goto error; |
53094c05 | 3998 | } |
fac6795d DG |
3999 | } |
4000 | ||
4001 | /* Check if daemon is UID = 0 */ | |
4002 | is_root = !getuid(); | |
4003 | ||
fac6795d | 4004 | if (is_root) { |
d6f42150 DG |
4005 | ret = create_lttng_rundir(); |
4006 | if (ret < 0) { | |
cf3af59e | 4007 | goto error; |
d6f42150 DG |
4008 | } |
4009 | ||
fac6795d | 4010 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4011 | snprintf(apps_unix_sock_path, PATH_MAX, |
4012 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4013 | } |
4014 | ||
4015 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4016 | snprintf(client_unix_sock_path, PATH_MAX, |
4017 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4018 | } | |
0fdd1e2c DG |
4019 | |
4020 | /* Set global SHM for ust */ | |
4021 | if (strlen(wait_shm_path) == 0) { | |
4022 | snprintf(wait_shm_path, PATH_MAX, | |
4023 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4024 | } | |
fac6795d | 4025 | } else { |
b082db07 DG |
4026 | home_path = get_home_dir(); |
4027 | if (home_path == NULL) { | |
273ea72c DG |
4028 | /* TODO: Add --socket PATH option */ |
4029 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4030 | ret = -EPERM; |
4031 | goto error; | |
b082db07 DG |
4032 | } |
4033 | ||
fac6795d | 4034 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4035 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4036 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4037 | } |
4038 | ||
4039 | /* Set the cli tool unix socket path */ | |
4040 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4041 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4042 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4043 | } |
0fdd1e2c DG |
4044 | |
4045 | /* Set global SHM for ust */ | |
4046 | if (strlen(wait_shm_path) == 0) { | |
4047 | snprintf(wait_shm_path, PATH_MAX, | |
4048 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4049 | } | |
fac6795d DG |
4050 | } |
4051 | ||
847177cd DG |
4052 | DBG("Client socket path %s", client_unix_sock_path); |
4053 | DBG("Application socket path %s", apps_unix_sock_path); | |
4054 | ||
273ea72c | 4055 | /* |
7d8234d9 | 4056 | * See if daemon already exist. |
fac6795d | 4057 | */ |
7d8234d9 | 4058 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4059 | ERR("Already running daemon.\n"); |
273ea72c | 4060 | /* |
cf3af59e MD |
4061 | * We do not goto exit because we must not cleanup() |
4062 | * because a daemon is already running. | |
ab118b20 | 4063 | */ |
cf3af59e | 4064 | goto error; |
a88df331 DG |
4065 | } |
4066 | ||
54d01ffb | 4067 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4068 | |
4069 | /* | |
4070 | * These actions must be executed as root. We do that *after* setting up | |
4071 | * the sockets path because we MUST make the check for another daemon using | |
4072 | * those paths *before* trying to set the kernel consumer sockets and init | |
4073 | * kernel tracer. | |
4074 | */ | |
4075 | if (is_root) { | |
3bd1e081 MD |
4076 | ret = set_consumer_sockets(&kconsumer_data); |
4077 | if (ret < 0) { | |
4078 | goto exit; | |
4079 | } | |
48842b30 | 4080 | |
7753dea8 | 4081 | ret = set_consumer_sockets(&ustconsumer64_data); |
a88df331 | 4082 | if (ret < 0) { |
cf3af59e | 4083 | goto exit; |
a88df331 | 4084 | } |
7753dea8 MD |
4085 | |
4086 | ret = set_consumer_sockets(&ustconsumer32_data); | |
4087 | if (ret < 0) { | |
4088 | goto exit; | |
4089 | } | |
4090 | ||
a88df331 DG |
4091 | /* Setup kernel tracer */ |
4092 | init_kernel_tracer(); | |
4093 | ||
4094 | /* Set ulimit for open files */ | |
4095 | set_ulimit(); | |
fac6795d DG |
4096 | } |
4097 | ||
cf3af59e MD |
4098 | if ((ret = set_signal_handler()) < 0) { |
4099 | goto exit; | |
fac6795d DG |
4100 | } |
4101 | ||
d6f42150 | 4102 | /* Setup the needed unix socket */ |
cf3af59e MD |
4103 | if ((ret = init_daemon_socket()) < 0) { |
4104 | goto exit; | |
fac6795d DG |
4105 | } |
4106 | ||
4107 | /* Set credentials to socket */ | |
cf3af59e MD |
4108 | if (is_root && ((ret = set_permissions()) < 0)) { |
4109 | goto exit; | |
fac6795d DG |
4110 | } |
4111 | ||
5b8719f5 DG |
4112 | /* Get parent pid if -S, --sig-parent is specified. */ |
4113 | if (opt_sig_parent) { | |
4114 | ppid = getppid(); | |
4115 | } | |
4116 | ||
7a485870 | 4117 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4118 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4119 | goto exit; | |
7a485870 DG |
4120 | } |
4121 | ||
099e26bd DG |
4122 | /* Setup the thread apps communication pipe. */ |
4123 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4124 | goto exit; | |
4125 | } | |
4126 | ||
4127 | /* Init UST command queue. */ | |
4128 | cds_wfq_init(&ust_cmd_queue.queue); | |
4129 | ||
f6a9efaa DG |
4130 | /* Init UST app hash table */ |
4131 | ust_app_ht_alloc(); | |
4132 | ||
273ea72c | 4133 | /* |
54d01ffb DG |
4134 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4135 | * statically declared in session.c | |
273ea72c | 4136 | */ |
54d01ffb | 4137 | session_list_ptr = session_get_list(); |
b5541356 | 4138 | |
5eb91c98 DG |
4139 | /* Set up max poll set size */ |
4140 | lttng_poll_set_max_size(); | |
4141 | ||
cf3af59e | 4142 | /* Create thread to manage the client socket */ |
099e26bd DG |
4143 | ret = pthread_create(&client_thread, NULL, |
4144 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4145 | if (ret != 0) { |
099e26bd | 4146 | perror("pthread_create clients"); |
cf3af59e MD |
4147 | goto exit_client; |
4148 | } | |
fac6795d | 4149 | |
099e26bd DG |
4150 | /* Create thread to dispatch registration */ |
4151 | ret = pthread_create(&dispatch_thread, NULL, | |
4152 | thread_dispatch_ust_registration, (void *) NULL); | |
4153 | if (ret != 0) { | |
4154 | perror("pthread_create dispatch"); | |
4155 | goto exit_dispatch; | |
4156 | } | |
4157 | ||
4158 | /* Create thread to manage application registration. */ | |
4159 | ret = pthread_create(®_apps_thread, NULL, | |
4160 | thread_registration_apps, (void *) NULL); | |
4161 | if (ret != 0) { | |
4162 | perror("pthread_create registration"); | |
4163 | goto exit_reg_apps; | |
4164 | } | |
4165 | ||
cf3af59e | 4166 | /* Create thread to manage application socket */ |
54d01ffb DG |
4167 | ret = pthread_create(&apps_thread, NULL, |
4168 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4169 | if (ret != 0) { |
099e26bd | 4170 | perror("pthread_create apps"); |
cf3af59e MD |
4171 | goto exit_apps; |
4172 | } | |
fac6795d | 4173 | |
cf3af59e | 4174 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4175 | ret = pthread_create(&kernel_thread, NULL, |
4176 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4177 | if (ret != 0) { |
099e26bd | 4178 | perror("pthread_create kernel"); |
cf3af59e MD |
4179 | goto exit_kernel; |
4180 | } | |
7a485870 | 4181 | |
cf3af59e MD |
4182 | ret = pthread_join(kernel_thread, &status); |
4183 | if (ret != 0) { | |
4184 | perror("pthread_join"); | |
4185 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4186 | } |
4187 | ||
cf3af59e MD |
4188 | exit_kernel: |
4189 | ret = pthread_join(apps_thread, &status); | |
4190 | if (ret != 0) { | |
4191 | perror("pthread_join"); | |
4192 | goto error; /* join error, exit without cleanup */ | |
4193 | } | |
fac6795d | 4194 | |
cf3af59e | 4195 | exit_apps: |
099e26bd DG |
4196 | ret = pthread_join(reg_apps_thread, &status); |
4197 | if (ret != 0) { | |
4198 | perror("pthread_join"); | |
4199 | goto error; /* join error, exit without cleanup */ | |
4200 | } | |
4201 | ||
4202 | exit_reg_apps: | |
4203 | ret = pthread_join(dispatch_thread, &status); | |
4204 | if (ret != 0) { | |
4205 | perror("pthread_join"); | |
4206 | goto error; /* join error, exit without cleanup */ | |
4207 | } | |
4208 | ||
4209 | exit_dispatch: | |
cf3af59e MD |
4210 | ret = pthread_join(client_thread, &status); |
4211 | if (ret != 0) { | |
4212 | perror("pthread_join"); | |
4213 | goto error; /* join error, exit without cleanup */ | |
4214 | } | |
4215 | ||
3bd1e081 | 4216 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4217 | if (ret != 0) { |
3bd1e081 | 4218 | perror("join_consumer"); |
cf3af59e MD |
4219 | goto error; /* join error, exit without cleanup */ |
4220 | } | |
a88df331 | 4221 | |
cf3af59e | 4222 | exit_client: |
a88df331 | 4223 | exit: |
cf3af59e MD |
4224 | /* |
4225 | * cleanup() is called when no other thread is running. | |
4226 | */ | |
f6a9efaa | 4227 | rcu_thread_online(); |
cf3af59e | 4228 | cleanup(); |
f6a9efaa DG |
4229 | rcu_thread_offline(); |
4230 | rcu_unregister_thread(); | |
cf3af59e MD |
4231 | if (!ret) |
4232 | exit(EXIT_SUCCESS); | |
4233 | error: | |
5e16da05 | 4234 | exit(EXIT_FAILURE); |
fac6795d | 4235 | } |