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 | { |
84ea9c99 MD |
338 | if (!session->kernel_session) |
339 | return; | |
340 | DBG("Tearing down kernel session"); | |
d9800920 | 341 | |
84ea9c99 MD |
342 | /* |
343 | * If a custom kernel consumer was registered, close the socket before | |
344 | * tearing down the complete kernel session structure | |
345 | */ | |
346 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
347 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 348 | } |
84ea9c99 MD |
349 | |
350 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
351 | } |
352 | ||
f6a9efaa DG |
353 | /* |
354 | * Complete teardown of all UST sessions. This will free everything on his path | |
355 | * and destroy the core essence of all ust sessions :) | |
356 | */ | |
357 | static void teardown_ust_session(struct ltt_session *session) | |
358 | { | |
84cd17c6 MD |
359 | int ret; |
360 | ||
f470a390 MD |
361 | if (!session->ust_session) |
362 | return; | |
84ea9c99 | 363 | DBG("Tearing down UST session(s)"); |
84cd17c6 MD |
364 | ret = ust_app_destroy_trace_all(session->ust_session); |
365 | if (ret) { | |
366 | ERR("Error in ust_app_destroy_trace_all"); | |
367 | } | |
f6a9efaa DG |
368 | trace_ust_destroy_session(session->ust_session); |
369 | } | |
370 | ||
099e26bd DG |
371 | /* |
372 | * Stop all threads by closing the thread quit pipe. | |
373 | */ | |
cf3af59e MD |
374 | static void stop_threads(void) |
375 | { | |
5eb91c98 DG |
376 | int ret; |
377 | ||
cf3af59e MD |
378 | /* Stopping all threads */ |
379 | DBG("Terminating all threads"); | |
54d01ffb | 380 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
381 | if (ret < 0) { |
382 | ERR("write error on thread quit pipe"); | |
383 | } | |
384 | ||
099e26bd DG |
385 | /* Dispatch thread */ |
386 | dispatch_thread_exit = 1; | |
387 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
388 | } |
389 | ||
fac6795d | 390 | /* |
d063d709 | 391 | * Cleanup the daemon |
fac6795d | 392 | */ |
cf3af59e | 393 | static void cleanup(void) |
fac6795d | 394 | { |
1d4b027a DG |
395 | int ret; |
396 | char *cmd; | |
af9737e9 | 397 | struct ltt_session *sess, *stmp; |
fac6795d | 398 | |
1d4b027a | 399 | DBG("Cleaning up"); |
e07ae692 | 400 | |
5eb91c98 DG |
401 | if (is_root) { |
402 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
403 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
404 | if (ret < 0) { | |
405 | ERR("asprintf failed. Something is really wrong!"); | |
406 | } | |
5461b305 | 407 | |
5eb91c98 DG |
408 | /* Remove lttng run directory */ |
409 | ret = system(cmd); | |
410 | if (ret < 0) { | |
411 | ERR("Unable to clean " LTTNG_RUNDIR); | |
412 | } | |
1d4b027a | 413 | } |
5461b305 | 414 | |
1d4b027a | 415 | DBG("Cleaning up all session"); |
fac6795d | 416 | |
b5541356 | 417 | /* Destroy session list mutex */ |
273ea72c DG |
418 | if (session_list_ptr != NULL) { |
419 | pthread_mutex_destroy(&session_list_ptr->lock); | |
420 | ||
421 | /* Cleanup ALL session */ | |
54d01ffb DG |
422 | cds_list_for_each_entry_safe(sess, stmp, |
423 | &session_list_ptr->head, list) { | |
273ea72c | 424 | teardown_kernel_session(sess); |
f6a9efaa DG |
425 | teardown_ust_session(sess); |
426 | free(sess); | |
273ea72c DG |
427 | } |
428 | } | |
429 | ||
099e26bd | 430 | DBG("Closing all UST sockets"); |
56fff090 | 431 | ust_app_clean_list(); |
099e26bd | 432 | |
3bd1e081 | 433 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 434 | |
f3ed775e | 435 | DBG("Closing kernel fd"); |
1d4b027a | 436 | close(kernel_tracer_fd); |
ab147185 | 437 | |
2f50c8a3 DG |
438 | if (is_root) { |
439 | DBG("Unloading kernel modules"); | |
440 | modprobe_remove_kernel_modules(); | |
441 | } | |
5eb91c98 DG |
442 | |
443 | close(thread_quit_pipe[0]); | |
444 | close(thread_quit_pipe[1]); | |
421cb601 DG |
445 | |
446 | /* <fun> */ | |
447 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
448 | "Matthew, BEET driven development works!%c[%dm", | |
449 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
450 | /* </fun> */ | |
fac6795d DG |
451 | } |
452 | ||
e065084a | 453 | /* |
d063d709 | 454 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 455 | * |
d063d709 | 456 | * Return lttcomm error code. |
e065084a DG |
457 | */ |
458 | static int send_unix_sock(int sock, void *buf, size_t len) | |
459 | { | |
460 | /* Check valid length */ | |
461 | if (len <= 0) { | |
462 | return -1; | |
463 | } | |
464 | ||
465 | return lttcomm_send_unix_sock(sock, buf, len); | |
466 | } | |
467 | ||
5461b305 | 468 | /* |
d063d709 | 469 | * Free memory of a command context structure. |
5461b305 | 470 | */ |
a2fb29a5 | 471 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 472 | { |
a2fb29a5 DG |
473 | DBG("Clean command context structure"); |
474 | if (*cmd_ctx) { | |
475 | if ((*cmd_ctx)->llm) { | |
476 | free((*cmd_ctx)->llm); | |
5461b305 | 477 | } |
a2fb29a5 DG |
478 | if ((*cmd_ctx)->lsm) { |
479 | free((*cmd_ctx)->lsm); | |
5461b305 | 480 | } |
a2fb29a5 DG |
481 | free(*cmd_ctx); |
482 | *cmd_ctx = NULL; | |
5461b305 DG |
483 | } |
484 | } | |
485 | ||
f3ed775e | 486 | /* |
d063d709 | 487 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 488 | */ |
2bdd86d4 | 489 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 490 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
491 | { |
492 | int ret; | |
f3ed775e | 493 | struct ltt_kernel_stream *stream; |
3bd1e081 | 494 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 495 | |
3bd1e081 | 496 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 497 | channel->channel->name); |
f3ed775e | 498 | |
3bd1e081 MD |
499 | /* Send channel */ |
500 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
501 | lkm.u.channel.channel_key = channel->fd; | |
502 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
503 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 504 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 505 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 506 | if (ret < 0) { |
3bd1e081 | 507 | perror("send consumer channel"); |
f3ed775e DG |
508 | goto error; |
509 | } | |
510 | ||
3bd1e081 | 511 | /* Send streams */ |
7a485870 | 512 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
513 | if (!stream->fd) { |
514 | continue; | |
515 | } | |
516 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
517 | lkm.u.stream.channel_key = channel->fd; | |
518 | lkm.u.stream.stream_key = stream->fd; | |
519 | lkm.u.stream.state = stream->state; | |
520 | lkm.u.stream.output = channel->channel->attr.output; | |
521 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
522 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
523 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
524 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
525 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
526 | if (ret < 0) { | |
527 | perror("send consumer stream"); | |
528 | goto error; | |
529 | } | |
530 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
531 | if (ret < 0) { | |
532 | perror("send consumer stream ancillary data"); | |
533 | goto error; | |
f3ed775e DG |
534 | } |
535 | } | |
536 | ||
3bd1e081 | 537 | DBG("consumer channel streams sent"); |
f3ed775e DG |
538 | |
539 | return 0; | |
540 | ||
541 | error: | |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
d063d709 | 546 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 547 | */ |
2bdd86d4 | 548 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 549 | struct ltt_kernel_session *session) |
f3ed775e DG |
550 | { |
551 | int ret; | |
552 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
553 | struct lttcomm_consumer_msg lkm; |
554 | int sock = session->consumer_fd; | |
7a485870 DG |
555 | |
556 | DBG("Sending metadata stream fd"); | |
557 | ||
2bdd86d4 | 558 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 559 | if (session->consumer_fd == 0) { |
3bd1e081 | 560 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
561 | } |
562 | ||
7a485870 | 563 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
564 | /* Send metadata channel fd */ |
565 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
566 | lkm.u.channel.channel_key = session->metadata->fd; | |
567 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
568 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
569 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
570 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
571 | if (ret < 0) { | |
572 | perror("send consumer channel"); | |
573 | goto error; | |
574 | } | |
575 | ||
576 | /* Send metadata stream fd */ | |
577 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
578 | lkm.u.stream.channel_key = session->metadata->fd; | |
579 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
580 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
581 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
582 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
583 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
584 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
585 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
586 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
587 | if (ret < 0) { | |
588 | perror("send consumer stream"); | |
589 | goto error; | |
590 | } | |
591 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 592 | if (ret < 0) { |
3bd1e081 | 593 | perror("send consumer stream"); |
7a485870 DG |
594 | goto error; |
595 | } | |
596 | } | |
f3ed775e | 597 | |
f3ed775e | 598 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
599 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
600 | if (ret < 0) { | |
601 | goto error; | |
602 | } | |
603 | } | |
604 | ||
605 | DBG("consumer fds (metadata and channel streams) sent"); | |
606 | ||
607 | return 0; | |
608 | ||
609 | error: | |
610 | return ret; | |
611 | } | |
612 | ||
fac6795d | 613 | /* |
0fdd1e2c | 614 | * Notify UST applications using the shm mmap futex. |
fac6795d | 615 | */ |
0fdd1e2c | 616 | static int notify_ust_apps(int active) |
fac6795d | 617 | { |
0fdd1e2c | 618 | char *wait_shm_mmap; |
fac6795d | 619 | |
0fdd1e2c | 620 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 621 | |
0fdd1e2c DG |
622 | /* See shm.c for this call implying mmap, shm and futex calls */ |
623 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
624 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
625 | goto error; |
626 | } | |
627 | ||
0fdd1e2c DG |
628 | /* Wake waiting process */ |
629 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
630 | ||
631 | /* Apps notified successfully */ | |
632 | return 0; | |
fac6795d DG |
633 | |
634 | error: | |
0fdd1e2c | 635 | return -1; |
fac6795d DG |
636 | } |
637 | ||
e065084a | 638 | /* |
d063d709 DG |
639 | * Setup the outgoing data buffer for the response (llm) by allocating the |
640 | * right amount of memory and copying the original information from the lsm | |
641 | * structure. | |
ca95a216 | 642 | * |
d063d709 | 643 | * Return total size of the buffer pointed by buf. |
ca95a216 | 644 | */ |
5461b305 | 645 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 646 | { |
f3ed775e | 647 | int ret, buf_size; |
ca95a216 | 648 | |
f3ed775e | 649 | buf_size = size; |
5461b305 | 650 | |
ba7f0ae5 | 651 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 652 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 653 | perror("zmalloc"); |
5461b305 | 654 | ret = -ENOMEM; |
ca95a216 DG |
655 | goto error; |
656 | } | |
657 | ||
5461b305 DG |
658 | /* Copy common data */ |
659 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 660 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 661 | |
5461b305 DG |
662 | cmd_ctx->llm->data_size = size; |
663 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
664 | ||
ca95a216 DG |
665 | return buf_size; |
666 | ||
667 | error: | |
668 | return ret; | |
669 | } | |
670 | ||
7a485870 | 671 | /* |
5eb91c98 | 672 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 673 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 674 | */ |
5eb91c98 | 675 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 676 | { |
5eb91c98 | 677 | int ret; |
7a485870 DG |
678 | struct ltt_session *session; |
679 | struct ltt_kernel_channel *channel; | |
680 | ||
5eb91c98 | 681 | DBG("Updating kernel poll set"); |
7a485870 | 682 | |
54d01ffb | 683 | session_lock_list(); |
b5541356 | 684 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 685 | session_lock(session); |
7a485870 | 686 | if (session->kernel_session == NULL) { |
54d01ffb | 687 | session_unlock(session); |
7a485870 DG |
688 | continue; |
689 | } | |
7a485870 | 690 | |
54d01ffb DG |
691 | cds_list_for_each_entry(channel, |
692 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
693 | /* Add channel fd to the kernel poll set */ |
694 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
695 | if (ret < 0) { | |
54d01ffb | 696 | session_unlock(session); |
5eb91c98 DG |
697 | goto error; |
698 | } | |
699 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 700 | } |
54d01ffb | 701 | session_unlock(session); |
7a485870 | 702 | } |
54d01ffb | 703 | session_unlock_list(); |
7a485870 | 704 | |
5eb91c98 | 705 | return 0; |
7a485870 DG |
706 | |
707 | error: | |
54d01ffb | 708 | session_unlock_list(); |
7a485870 DG |
709 | return -1; |
710 | } | |
711 | ||
712 | /* | |
54d01ffb | 713 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 714 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 715 | * |
d063d709 | 716 | * Useful for CPU hotplug feature. |
7a485870 | 717 | */ |
2bdd86d4 | 718 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
719 | { |
720 | int ret = 0; | |
721 | struct ltt_session *session; | |
722 | struct ltt_kernel_channel *channel; | |
723 | ||
724 | DBG("Updating kernel streams for channel fd %d", fd); | |
725 | ||
54d01ffb | 726 | session_lock_list(); |
b5541356 | 727 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 728 | session_lock(session); |
7a485870 | 729 | if (session->kernel_session == NULL) { |
54d01ffb | 730 | session_unlock(session); |
7a485870 DG |
731 | continue; |
732 | } | |
d9800920 DG |
733 | |
734 | /* This is not suppose to be 0 but this is an extra security check */ | |
735 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 736 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
737 | } |
738 | ||
5eb91c98 DG |
739 | cds_list_for_each_entry(channel, |
740 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
741 | if (channel->fd == fd) { |
742 | DBG("Channel found, updating kernel streams"); | |
743 | ret = kernel_open_channel_stream(channel); | |
744 | if (ret < 0) { | |
b3c750d2 | 745 | goto error; |
7a485870 | 746 | } |
d9800920 | 747 | |
7a485870 | 748 | /* |
5eb91c98 DG |
749 | * Have we already sent fds to the consumer? If yes, it means |
750 | * that tracing is started so it is safe to send our updated | |
751 | * stream fds. | |
7a485870 | 752 | */ |
3bd1e081 | 753 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 754 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 755 | session->kernel_session->consumer_fd, channel); |
7a485870 | 756 | if (ret < 0) { |
b3c750d2 | 757 | goto error; |
7a485870 DG |
758 | } |
759 | } | |
b3c750d2 | 760 | goto error; |
7a485870 DG |
761 | } |
762 | } | |
54d01ffb | 763 | session_unlock(session); |
7a485870 | 764 | } |
54d01ffb | 765 | session_unlock_list(); |
b3c750d2 | 766 | return ret; |
7a485870 | 767 | |
b3c750d2 | 768 | error: |
54d01ffb DG |
769 | session_unlock(session); |
770 | session_unlock_list(); | |
7a485870 DG |
771 | return ret; |
772 | } | |
773 | ||
487cf67c DG |
774 | /* |
775 | * For each tracing session, update newly registered apps. | |
776 | */ | |
777 | static void update_ust_app(int app_sock) | |
778 | { | |
779 | struct ltt_session *sess, *stmp; | |
780 | ||
781 | /* For all tracing session(s) */ | |
782 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
783 | if (sess->ust_session) { |
784 | ust_app_global_update(sess->ust_session, app_sock); | |
785 | } | |
487cf67c DG |
786 | } |
787 | } | |
788 | ||
7a485870 | 789 | /* |
d063d709 | 790 | * This thread manage event coming from the kernel. |
7a485870 | 791 | * |
d063d709 DG |
792 | * Features supported in this thread: |
793 | * -) CPU Hotplug | |
7a485870 DG |
794 | */ |
795 | static void *thread_manage_kernel(void *data) | |
796 | { | |
5eb91c98 DG |
797 | int ret, i, pollfd, update_poll_flag = 1; |
798 | uint32_t revents, nb_fd; | |
7a485870 | 799 | char tmp; |
5eb91c98 | 800 | struct lttng_poll_event events; |
7a485870 DG |
801 | |
802 | DBG("Thread manage kernel started"); | |
803 | ||
5eb91c98 DG |
804 | ret = create_thread_poll_set(&events, 2); |
805 | if (ret < 0) { | |
806 | goto error; | |
807 | } | |
808 | ||
809 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
810 | if (ret < 0) { | |
811 | goto error; | |
812 | } | |
813 | ||
7a485870 DG |
814 | while (1) { |
815 | if (update_poll_flag == 1) { | |
5f822d0a DG |
816 | /* |
817 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
818 | * quit pipe and the kernel pipe. | |
819 | */ | |
820 | events.nb_fd = 2; | |
821 | ||
5eb91c98 DG |
822 | ret = update_kernel_poll(&events); |
823 | if (ret < 0) { | |
7a485870 DG |
824 | goto error; |
825 | } | |
826 | update_poll_flag = 0; | |
827 | } | |
828 | ||
5eb91c98 DG |
829 | nb_fd = LTTNG_POLL_GETNB(&events); |
830 | ||
831 | DBG("Thread kernel polling on %d fds", nb_fd); | |
832 | ||
833 | /* Zeroed the poll events */ | |
834 | lttng_poll_reset(&events); | |
7a485870 DG |
835 | |
836 | /* Poll infinite value of time */ | |
5eb91c98 | 837 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 838 | if (ret < 0) { |
7a485870 DG |
839 | goto error; |
840 | } else if (ret == 0) { | |
841 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
842 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
843 | "This should not have happened! Continuing..."); | |
7a485870 DG |
844 | continue; |
845 | } | |
846 | ||
5eb91c98 DG |
847 | for (i = 0; i < nb_fd; i++) { |
848 | /* Fetch once the poll data */ | |
849 | revents = LTTNG_POLL_GETEV(&events, i); | |
850 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 851 | |
5eb91c98 DG |
852 | /* Thread quit pipe has been closed. Killing thread. */ |
853 | ret = check_thread_quit_pipe(pollfd, revents); | |
854 | if (ret) { | |
855 | goto error; | |
856 | } | |
7a485870 | 857 | |
5eb91c98 DG |
858 | /* Check for data on kernel pipe */ |
859 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
860 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
861 | update_poll_flag = 1; | |
862 | continue; | |
863 | } else { | |
864 | /* | |
865 | * New CPU detected by the kernel. Adding kernel stream to | |
866 | * kernel session and updating the kernel consumer | |
867 | */ | |
868 | if (revents & LPOLLIN) { | |
2bdd86d4 | 869 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
870 | if (ret < 0) { |
871 | continue; | |
872 | } | |
873 | break; | |
874 | /* | |
875 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
876 | * and unregister kernel stream at this point. | |
877 | */ | |
7a485870 | 878 | } |
7a485870 DG |
879 | } |
880 | } | |
881 | } | |
882 | ||
883 | error: | |
884 | DBG("Kernel thread dying"); | |
273ea72c DG |
885 | close(kernel_poll_pipe[0]); |
886 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
887 | |
888 | lttng_poll_clean(&events); | |
889 | ||
7a485870 DG |
890 | return NULL; |
891 | } | |
892 | ||
1d4b027a | 893 | /* |
3bd1e081 | 894 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 895 | */ |
3bd1e081 | 896 | static void *thread_manage_consumer(void *data) |
1d4b027a | 897 | { |
5eb91c98 DG |
898 | int sock = 0, i, ret, pollfd; |
899 | uint32_t revents, nb_fd; | |
1d4b027a | 900 | enum lttcomm_return_code code; |
5eb91c98 | 901 | struct lttng_poll_event events; |
3bd1e081 | 902 | struct consumer_data *consumer_data = data; |
1d4b027a | 903 | |
3bd1e081 | 904 | DBG("[thread] Manage consumer started"); |
1d4b027a | 905 | |
3bd1e081 | 906 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
907 | if (ret < 0) { |
908 | goto error; | |
909 | } | |
910 | ||
5eb91c98 DG |
911 | /* |
912 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
913 | * Nothing more will be added to this poll set. | |
914 | */ | |
915 | ret = create_thread_poll_set(&events, 2); | |
916 | if (ret < 0) { | |
917 | goto error; | |
918 | } | |
273ea72c | 919 | |
3bd1e081 | 920 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
921 | if (ret < 0) { |
922 | goto error; | |
923 | } | |
924 | ||
925 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
926 | |
927 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 928 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 929 | if (ret < 0) { |
273ea72c DG |
930 | goto error; |
931 | } | |
932 | ||
5eb91c98 DG |
933 | for (i = 0; i < nb_fd; i++) { |
934 | /* Fetch once the poll data */ | |
935 | revents = LTTNG_POLL_GETEV(&events, i); | |
936 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
937 | ||
938 | /* Thread quit pipe has been closed. Killing thread. */ | |
939 | ret = check_thread_quit_pipe(pollfd, revents); | |
940 | if (ret) { | |
941 | goto error; | |
942 | } | |
943 | ||
944 | /* Event on the registration socket */ | |
3bd1e081 | 945 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 946 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 947 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
948 | goto error; |
949 | } | |
950 | } | |
273ea72c DG |
951 | } |
952 | ||
3bd1e081 | 953 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
954 | if (sock < 0) { |
955 | goto error; | |
956 | } | |
957 | ||
3bd1e081 | 958 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 959 | |
712ea556 | 960 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
961 | ret = lttcomm_recv_unix_sock(sock, &code, |
962 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
963 | if (ret <= 0) { |
964 | goto error; | |
965 | } | |
966 | ||
3bd1e081 MD |
967 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
968 | consumer_data->cmd_sock = | |
969 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
970 | if (consumer_data->cmd_sock < 0) { | |
971 | sem_post(&consumer_data->sem); | |
48842b30 | 972 | PERROR("consumer connect"); |
1d4b027a DG |
973 | goto error; |
974 | } | |
975 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
976 | sem_post(&consumer_data->sem); |
977 | DBG("consumer command socket ready"); | |
1d4b027a | 978 | } else { |
3bd1e081 | 979 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
980 | lttcomm_get_readable_code(-code)); |
981 | goto error; | |
982 | } | |
983 | ||
54d01ffb | 984 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 985 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 986 | if (ret < 0) { |
72079cae DG |
987 | goto error; |
988 | } | |
989 | ||
5eb91c98 DG |
990 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
991 | if (ret < 0) { | |
72079cae | 992 | goto error; |
5eb91c98 DG |
993 | } |
994 | ||
995 | /* Update number of fd */ | |
996 | nb_fd = LTTNG_POLL_GETNB(&events); | |
997 | ||
998 | /* Inifinite blocking call, waiting for transmission */ | |
999 | ret = lttng_poll_wait(&events, -1); | |
1000 | if (ret < 0) { | |
72079cae DG |
1001 | goto error; |
1002 | } | |
1003 | ||
5eb91c98 DG |
1004 | for (i = 0; i < nb_fd; i++) { |
1005 | /* Fetch once the poll data */ | |
1006 | revents = LTTNG_POLL_GETEV(&events, i); | |
1007 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1008 | ||
1009 | /* Thread quit pipe has been closed. Killing thread. */ | |
1010 | ret = check_thread_quit_pipe(pollfd, revents); | |
1011 | if (ret) { | |
1012 | goto error; | |
1013 | } | |
1014 | ||
1015 | /* Event on the kconsumerd socket */ | |
1016 | if (pollfd == sock) { | |
1017 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1018 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1019 | goto error; |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | ||
712ea556 | 1024 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1025 | ret = lttcomm_recv_unix_sock(sock, &code, |
1026 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1027 | if (ret <= 0) { |
3bd1e081 | 1028 | ERR("consumer closed the command socket"); |
712ea556 | 1029 | goto error; |
6f61d021 | 1030 | } |
1d4b027a | 1031 | |
3bd1e081 | 1032 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1033 | |
1d4b027a | 1034 | error: |
3bd1e081 MD |
1035 | DBG("consumer thread dying"); |
1036 | close(consumer_data->err_sock); | |
1037 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1038 | close(sock); |
273ea72c | 1039 | |
3bd1e081 MD |
1040 | unlink(consumer_data->err_unix_sock_path); |
1041 | unlink(consumer_data->cmd_unix_sock_path); | |
1042 | consumer_data->pid = 0; | |
1d4b027a | 1043 | |
5eb91c98 | 1044 | lttng_poll_clean(&events); |
0177d773 | 1045 | |
5eb91c98 | 1046 | return NULL; |
099e26bd DG |
1047 | } |
1048 | ||
099e26bd DG |
1049 | /* |
1050 | * This thread manage application communication. | |
1d4b027a DG |
1051 | */ |
1052 | static void *thread_manage_apps(void *data) | |
099e26bd | 1053 | { |
5eb91c98 DG |
1054 | int i, ret, pollfd; |
1055 | uint32_t revents, nb_fd; | |
099e26bd | 1056 | struct ust_command ust_cmd; |
5eb91c98 | 1057 | struct lttng_poll_event events; |
099e26bd DG |
1058 | |
1059 | DBG("[thread] Manage application started"); | |
1060 | ||
f6a9efaa DG |
1061 | rcu_register_thread(); |
1062 | rcu_thread_online(); | |
1063 | ||
5eb91c98 DG |
1064 | ret = create_thread_poll_set(&events, 2); |
1065 | if (ret < 0) { | |
1066 | goto error; | |
1067 | } | |
099e26bd | 1068 | |
5eb91c98 DG |
1069 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1070 | if (ret < 0) { | |
1071 | goto error; | |
1072 | } | |
099e26bd | 1073 | |
5eb91c98 DG |
1074 | while (1) { |
1075 | /* Zeroed the events structure */ | |
1076 | lttng_poll_reset(&events); | |
0177d773 | 1077 | |
5eb91c98 | 1078 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1079 | |
1080 | DBG("Apps thread polling on %d fds", nb_fd); | |
1081 | ||
1082 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1083 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1084 | if (ret < 0) { |
099e26bd DG |
1085 | goto error; |
1086 | } | |
1087 | ||
5eb91c98 DG |
1088 | for (i = 0; i < nb_fd; i++) { |
1089 | /* Fetch once the poll data */ | |
1090 | revents = LTTNG_POLL_GETEV(&events, i); | |
1091 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1092 | ||
1093 | /* Thread quit pipe has been closed. Killing thread. */ | |
1094 | ret = check_thread_quit_pipe(pollfd, revents); | |
1095 | if (ret) { | |
099e26bd | 1096 | goto error; |
5eb91c98 | 1097 | } |
099e26bd | 1098 | |
5eb91c98 DG |
1099 | /* Inspect the apps cmd pipe */ |
1100 | if (pollfd == apps_cmd_pipe[0]) { | |
1101 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1102 | ERR("Apps command pipe error"); | |
0177d773 | 1103 | goto error; |
5eb91c98 DG |
1104 | } else if (revents & LPOLLIN) { |
1105 | /* Empty pipe */ | |
1106 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1107 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1108 | perror("read apps cmd pipe"); | |
1109 | goto error; | |
1110 | } | |
099e26bd | 1111 | |
5eb91c98 | 1112 | /* Register applicaton to the session daemon */ |
56fff090 | 1113 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1114 | ust_cmd.sock); |
88ff5b7f | 1115 | if (ret == -ENOMEM) { |
5eb91c98 | 1116 | goto error; |
88ff5b7f MD |
1117 | } else if (ret < 0) { |
1118 | break; | |
5eb91c98 DG |
1119 | } |
1120 | ||
acc7b41b MD |
1121 | /* |
1122 | * Add channel(s) and event(s) to newly registered apps | |
1123 | * from lttng global UST domain. | |
1124 | */ | |
1125 | update_ust_app(ust_cmd.sock); | |
1126 | ||
5eb91c98 DG |
1127 | ret = ustctl_register_done(ust_cmd.sock); |
1128 | if (ret < 0) { | |
1129 | /* | |
1130 | * If the registration is not possible, we simply | |
1131 | * unregister the apps and continue | |
1132 | */ | |
56fff090 | 1133 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1134 | } else { |
1135 | /* | |
1136 | * We just need here to monitor the close of the UST | |
1137 | * socket and poll set monitor those by default. | |
1138 | */ | |
1139 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1140 | if (ret < 0) { | |
1141 | goto error; | |
1142 | } | |
1143 | ||
54d01ffb DG |
1144 | DBG("Apps with sock %d added to poll set", |
1145 | ust_cmd.sock); | |
5eb91c98 | 1146 | } |
487cf67c | 1147 | |
5eb91c98 | 1148 | break; |
0177d773 | 1149 | } |
5eb91c98 DG |
1150 | } else { |
1151 | /* | |
54d01ffb DG |
1152 | * At this point, we know that a registered application made |
1153 | * the event at poll_wait. | |
5eb91c98 DG |
1154 | */ |
1155 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1156 | /* Removing from the poll set */ | |
1157 | ret = lttng_poll_del(&events, pollfd); | |
1158 | if (ret < 0) { | |
1159 | goto error; | |
1160 | } | |
099e26bd | 1161 | |
b9d9b220 | 1162 | /* Socket closed on remote end. */ |
56fff090 | 1163 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1164 | break; |
1165 | } | |
099e26bd DG |
1166 | } |
1167 | } | |
099e26bd DG |
1168 | } |
1169 | ||
1170 | error: | |
1171 | DBG("Application communication apps dying"); | |
1172 | close(apps_cmd_pipe[0]); | |
1173 | close(apps_cmd_pipe[1]); | |
1174 | ||
5eb91c98 | 1175 | lttng_poll_clean(&events); |
099e26bd | 1176 | |
f6a9efaa DG |
1177 | rcu_thread_offline(); |
1178 | rcu_unregister_thread(); | |
099e26bd DG |
1179 | return NULL; |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * Dispatch request from the registration threads to the application | |
1184 | * communication thread. | |
1185 | */ | |
1186 | static void *thread_dispatch_ust_registration(void *data) | |
1187 | { | |
1188 | int ret; | |
1189 | struct cds_wfq_node *node; | |
1190 | struct ust_command *ust_cmd = NULL; | |
1191 | ||
1192 | DBG("[thread] Dispatch UST command started"); | |
1193 | ||
1194 | while (!dispatch_thread_exit) { | |
1195 | /* Atomically prepare the queue futex */ | |
1196 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1197 | ||
1198 | do { | |
1199 | /* Dequeue command for registration */ | |
1200 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1201 | if (node == NULL) { | |
00a17c97 | 1202 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1203 | /* Continue thread execution */ |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1208 | ||
2f50c8a3 DG |
1209 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1210 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1211 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1212 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1213 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1214 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1215 | /* |
1216 | * Inform apps thread of the new application registration. This | |
1217 | * call is blocking so we can be assured that the data will be read | |
1218 | * at some point in time or wait to the end of the world :) | |
1219 | */ | |
1220 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1221 | sizeof(struct ust_command)); | |
1222 | if (ret < 0) { | |
1223 | perror("write apps cmd pipe"); | |
1224 | if (errno == EBADF) { | |
1225 | /* | |
1226 | * We can't inform the application thread to process | |
1227 | * registration. We will exit or else application | |
1228 | * registration will not occur and tracing will never | |
1229 | * start. | |
1230 | */ | |
1231 | goto error; | |
1232 | } | |
1233 | } | |
1234 | free(ust_cmd); | |
1235 | } while (node != NULL); | |
1236 | ||
1237 | /* Futex wait on queue. Blocking call on futex() */ | |
1238 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1239 | } | |
1240 | ||
1241 | error: | |
1242 | DBG("Dispatch thread dying"); | |
1243 | return NULL; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * This thread manage application registration. | |
1248 | */ | |
1249 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1250 | { |
5eb91c98 DG |
1251 | int sock = 0, i, ret, pollfd; |
1252 | uint32_t revents, nb_fd; | |
1253 | struct lttng_poll_event events; | |
099e26bd DG |
1254 | /* |
1255 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1256 | * freed in the manage apps thread. | |
1257 | */ | |
1258 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1259 | |
099e26bd | 1260 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1261 | |
1262 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1263 | if (ret < 0) { | |
1264 | goto error; | |
1265 | } | |
1266 | ||
5eb91c98 DG |
1267 | /* |
1268 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1269 | * more will be added to this poll set. | |
1270 | */ | |
1271 | ret = create_thread_poll_set(&events, 2); | |
1272 | if (ret < 0) { | |
1273 | goto error; | |
1274 | } | |
273ea72c | 1275 | |
5eb91c98 DG |
1276 | /* Add the application registration socket */ |
1277 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1278 | if (ret < 0) { | |
1279 | goto error; | |
1280 | } | |
273ea72c | 1281 | |
1d4b027a | 1282 | /* Notify all applications to register */ |
0fdd1e2c DG |
1283 | ret = notify_ust_apps(1); |
1284 | if (ret < 0) { | |
1285 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1286 | "Execution continues but there might be problem for already\n" |
1287 | "running applications that wishes to register."); | |
0fdd1e2c | 1288 | } |
1d4b027a DG |
1289 | |
1290 | while (1) { | |
1291 | DBG("Accepting application registration"); | |
273ea72c | 1292 | |
5eb91c98 DG |
1293 | nb_fd = LTTNG_POLL_GETNB(&events); |
1294 | ||
273ea72c | 1295 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1296 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1297 | if (ret < 0) { |
273ea72c DG |
1298 | goto error; |
1299 | } | |
1300 | ||
5eb91c98 DG |
1301 | for (i = 0; i < nb_fd; i++) { |
1302 | /* Fetch once the poll data */ | |
1303 | revents = LTTNG_POLL_GETEV(&events, i); | |
1304 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1305 | |
5eb91c98 DG |
1306 | /* Thread quit pipe has been closed. Killing thread. */ |
1307 | ret = check_thread_quit_pipe(pollfd, revents); | |
1308 | if (ret) { | |
90014c57 DG |
1309 | goto error; |
1310 | } | |
1d4b027a | 1311 | |
5eb91c98 DG |
1312 | /* Event on the registration socket */ |
1313 | if (pollfd == apps_sock) { | |
1314 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1315 | ERR("Register apps socket poll error"); | |
1316 | goto error; | |
1317 | } else if (revents & LPOLLIN) { | |
1318 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1319 | if (sock < 0) { | |
1320 | goto error; | |
1321 | } | |
099e26bd | 1322 | |
5eb91c98 | 1323 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1324 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1325 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1326 | perror("ust command zmalloc"); |
5eb91c98 DG |
1327 | goto error; |
1328 | } | |
1d4b027a | 1329 | |
5eb91c98 DG |
1330 | /* |
1331 | * Using message-based transmissions to ensure we don't | |
1332 | * have to deal with partially received messages. | |
1333 | */ | |
1334 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1335 | sizeof(struct ust_register_msg)); | |
1336 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1337 | if (ret < 0) { | |
1338 | perror("lttcomm_recv_unix_sock register apps"); | |
1339 | } else { | |
1340 | ERR("Wrong size received on apps register"); | |
1341 | } | |
1342 | free(ust_cmd); | |
1343 | close(sock); | |
1344 | continue; | |
1345 | } | |
099e26bd | 1346 | |
5eb91c98 | 1347 | ust_cmd->sock = sock; |
099e26bd | 1348 | |
5eb91c98 DG |
1349 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1350 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1351 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1352 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1353 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1354 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1355 | |
5eb91c98 DG |
1356 | /* |
1357 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1358 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1359 | */ |
1360 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1361 | ||
1362 | /* | |
1363 | * Wake the registration queue futex. Implicit memory | |
1364 | * barrier with the exchange in cds_wfq_enqueue. | |
1365 | */ | |
1366 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1367 | } | |
1368 | } | |
90014c57 | 1369 | } |
1d4b027a DG |
1370 | } |
1371 | ||
1372 | error: | |
0fdd1e2c DG |
1373 | DBG("UST Registration thread dying"); |
1374 | ||
1375 | /* Notify that the registration thread is gone */ | |
1376 | notify_ust_apps(0); | |
1377 | ||
1378 | close(apps_sock); | |
1379 | close(sock); | |
273ea72c | 1380 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1381 | |
5eb91c98 DG |
1382 | lttng_poll_clean(&events); |
1383 | ||
1d4b027a DG |
1384 | return NULL; |
1385 | } | |
1386 | ||
8c0faa1d | 1387 | /* |
3bd1e081 | 1388 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1389 | * exec or it will fails. |
8c0faa1d | 1390 | */ |
3bd1e081 | 1391 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1392 | { |
1393 | int ret; | |
ee0b0061 DG |
1394 | struct timespec timeout; |
1395 | ||
1396 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1397 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1398 | |
1399 | /* Setup semaphore */ | |
3bd1e081 | 1400 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1401 | if (ret < 0) { |
3bd1e081 | 1402 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1403 | goto error; |
1404 | } | |
8c0faa1d | 1405 | |
3bd1e081 MD |
1406 | ret = pthread_create(&consumer_data->thread, NULL, |
1407 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1408 | if (ret != 0) { |
3bd1e081 | 1409 | PERROR("pthread_create consumer"); |
ee0b0061 | 1410 | ret = -1; |
8c0faa1d DG |
1411 | goto error; |
1412 | } | |
1413 | ||
ee0b0061 DG |
1414 | /* Get time for sem_timedwait absolute timeout */ |
1415 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1416 | if (ret < 0) { | |
3bd1e081 | 1417 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1418 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1419 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1420 | } else { |
1421 | /* Normal timeout if the gettime was successful */ | |
1422 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1423 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1424 | } |
8c0faa1d | 1425 | |
ee0b0061 DG |
1426 | if (ret < 0) { |
1427 | if (errno == ETIMEDOUT) { | |
1428 | /* | |
1429 | * Call has timed out so we kill the kconsumerd_thread and return | |
1430 | * an error. | |
1431 | */ | |
3bd1e081 MD |
1432 | ERR("The consumer thread was never ready. Killing it"); |
1433 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1434 | if (ret < 0) { |
3bd1e081 | 1435 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1436 | } |
1437 | } else { | |
3bd1e081 | 1438 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1439 | } |
1440 | goto error; | |
1441 | } | |
1442 | ||
3bd1e081 MD |
1443 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1444 | if (consumer_data->pid == 0) { | |
712ea556 | 1445 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1446 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1447 | goto error; |
1448 | } | |
3bd1e081 | 1449 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1450 | |
8c0faa1d DG |
1451 | return 0; |
1452 | ||
1453 | error: | |
1454 | return ret; | |
1455 | } | |
1456 | ||
d9800920 | 1457 | /* |
3bd1e081 | 1458 | * Join consumer thread |
d9800920 | 1459 | */ |
3bd1e081 | 1460 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1461 | { |
1462 | void *status; | |
1463 | int ret; | |
1464 | ||
3bd1e081 MD |
1465 | if (consumer_data->pid != 0) { |
1466 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1467 | if (ret) { |
3bd1e081 | 1468 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1469 | return ret; |
1470 | } | |
3bd1e081 | 1471 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1472 | } else { |
1473 | return 0; | |
1474 | } | |
1475 | } | |
1476 | ||
8c0faa1d | 1477 | /* |
3bd1e081 | 1478 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1479 | * |
d063d709 | 1480 | * Return pid if successful else -1. |
8c0faa1d | 1481 | */ |
3bd1e081 | 1482 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1483 | { |
1484 | int ret; | |
1485 | pid_t pid; | |
53086306 | 1486 | const char *verbosity; |
8c0faa1d | 1487 | |
3bd1e081 | 1488 | DBG("Spawning consumerd"); |
c49dc785 | 1489 | |
8c0faa1d DG |
1490 | pid = fork(); |
1491 | if (pid == 0) { | |
1492 | /* | |
3bd1e081 | 1493 | * Exec consumerd. |
8c0faa1d | 1494 | */ |
3bd1e081 | 1495 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1496 | verbosity = "--verbose"; |
1497 | } else { | |
1498 | verbosity = "--quiet"; | |
1499 | } | |
3bd1e081 MD |
1500 | switch (consumer_data->type) { |
1501 | case LTTNG_CONSUMER_KERNEL: | |
1502 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
7753dea8 MD |
1503 | "lttng-consumerd", verbosity, "-k", |
1504 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1505 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1506 | NULL); | |
3bd1e081 | 1507 | break; |
7753dea8 MD |
1508 | case LTTNG_CONSUMER64_UST: |
1509 | { | |
1510 | char path[PATH_MAX]; | |
1511 | ||
1512 | snprintf(path, PATH_MAX, "%s/%s", | |
1513 | consumerd64_bindir, consumerd64_prog); | |
1514 | execl(path, verbosity, "-u", | |
1515 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1516 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1517 | NULL); | |
3bd1e081 | 1518 | break; |
7753dea8 MD |
1519 | } |
1520 | case LTTNG_CONSUMER32_UST: | |
1521 | { | |
1522 | char path[PATH_MAX]; | |
1523 | ||
1524 | snprintf(path, PATH_MAX, "%s/%s", | |
1525 | consumerd32_bindir, consumerd32_prog); | |
1526 | execl(path, verbosity, "-u", | |
1527 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1528 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1529 | NULL); | |
1530 | break; | |
1531 | } | |
3bd1e081 MD |
1532 | default: |
1533 | perror("unknown consumer type"); | |
1534 | exit(EXIT_FAILURE); | |
1535 | } | |
8c0faa1d DG |
1536 | if (errno != 0) { |
1537 | perror("kernel start consumer exec"); | |
1538 | } | |
1539 | exit(EXIT_FAILURE); | |
1540 | } else if (pid > 0) { | |
1541 | ret = pid; | |
8c0faa1d | 1542 | } else { |
3bd1e081 | 1543 | perror("start consumer fork"); |
8c0faa1d | 1544 | ret = -errno; |
8c0faa1d | 1545 | } |
8c0faa1d DG |
1546 | return ret; |
1547 | } | |
1548 | ||
693bd40b | 1549 | /* |
3bd1e081 | 1550 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1551 | */ |
3bd1e081 | 1552 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1553 | { |
1554 | int ret; | |
1555 | ||
3bd1e081 MD |
1556 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1557 | if (consumer_data->pid != 0) { | |
1558 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1559 | goto end; |
1560 | } | |
693bd40b | 1561 | |
3bd1e081 | 1562 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1563 | if (ret < 0) { |
3bd1e081 MD |
1564 | ERR("Spawning consumerd failed"); |
1565 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1566 | goto error; |
693bd40b | 1567 | } |
c49dc785 | 1568 | |
3bd1e081 MD |
1569 | /* Setting up the consumer_data pid */ |
1570 | consumer_data->pid = ret; | |
48842b30 | 1571 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1572 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1573 | |
3bd1e081 MD |
1574 | DBG2("Spawning consumer control thread"); |
1575 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1576 | if (ret < 0) { |
3bd1e081 | 1577 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1578 | goto error; |
1579 | } | |
1580 | ||
c49dc785 | 1581 | end: |
693bd40b DG |
1582 | return 0; |
1583 | ||
1584 | error: | |
1585 | return ret; | |
1586 | } | |
1587 | ||
b73401da | 1588 | /* |
d063d709 | 1589 | * modprobe_kernel_modules |
b73401da DG |
1590 | */ |
1591 | static int modprobe_kernel_modules(void) | |
1592 | { | |
ab147185 | 1593 | int ret = 0, i; |
b73401da DG |
1594 | char modprobe[256]; |
1595 | ||
ab147185 MD |
1596 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1597 | ret = snprintf(modprobe, sizeof(modprobe), | |
1598 | "/sbin/modprobe %s%s", | |
24b487b8 | 1599 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1600 | kernel_modules_list[i].name); |
b73401da DG |
1601 | if (ret < 0) { |
1602 | perror("snprintf modprobe"); | |
1603 | goto error; | |
1604 | } | |
ab147185 | 1605 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1606 | ret = system(modprobe); |
ab147185 MD |
1607 | if (ret == -1) { |
1608 | ERR("Unable to launch modprobe for module %s", | |
1609 | kernel_modules_list[i].name); | |
1610 | } else if (kernel_modules_list[i].required | |
d9800920 | 1611 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1612 | ERR("Unable to load module %s", |
1613 | kernel_modules_list[i].name); | |
1614 | } else { | |
1615 | DBG("Modprobe successfully %s", | |
1616 | kernel_modules_list[i].name); | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | error: | |
1621 | return ret; | |
1622 | } | |
1623 | ||
b73401da | 1624 | /* |
d063d709 | 1625 | * mount_debugfs |
b73401da DG |
1626 | */ |
1627 | static int mount_debugfs(char *path) | |
1628 | { | |
1629 | int ret; | |
1630 | char *type = "debugfs"; | |
1631 | ||
996b65c8 | 1632 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1633 | if (ret < 0) { |
7272acf5 | 1634 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1635 | goto error; |
1636 | } | |
1637 | ||
1638 | ret = mount(type, path, type, 0, NULL); | |
1639 | if (ret < 0) { | |
7272acf5 | 1640 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1641 | goto error; |
1642 | } | |
1643 | ||
1644 | DBG("Mounted debugfs successfully at %s", path); | |
1645 | ||
1646 | error: | |
1647 | return ret; | |
1648 | } | |
1649 | ||
8c0faa1d | 1650 | /* |
d063d709 | 1651 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1652 | */ |
f3ed775e | 1653 | static void init_kernel_tracer(void) |
8c0faa1d | 1654 | { |
b73401da DG |
1655 | int ret; |
1656 | char *proc_mounts = "/proc/mounts"; | |
1657 | char line[256]; | |
684d34d2 | 1658 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1659 | FILE *fp; |
1660 | ||
1661 | /* Detect debugfs */ | |
1662 | fp = fopen(proc_mounts, "r"); | |
1663 | if (fp == NULL) { | |
1664 | ERR("Unable to probe %s", proc_mounts); | |
1665 | goto error; | |
1666 | } | |
1667 | ||
1668 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1669 | if (strstr(line, "debugfs") != NULL) { | |
1670 | /* Remove first string */ | |
1671 | strtok(line, " "); | |
1672 | /* Dup string here so we can reuse line later on */ | |
1673 | debugfs_path = strdup(strtok(NULL, " ")); | |
1674 | DBG("Got debugfs path : %s", debugfs_path); | |
1675 | break; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | fclose(fp); | |
1680 | ||
1681 | /* Mount debugfs if needded */ | |
1682 | if (debugfs_path == NULL) { | |
1683 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1684 | if (ret < 0) { | |
1685 | perror("asprintf debugfs path"); | |
1686 | goto error; | |
1687 | } | |
1688 | ret = mount_debugfs(debugfs_path); | |
1689 | if (ret < 0) { | |
7272acf5 | 1690 | perror("Cannot mount debugfs"); |
b73401da DG |
1691 | goto error; |
1692 | } | |
1693 | } | |
1694 | ||
1695 | /* Modprobe lttng kernel modules */ | |
1696 | ret = modprobe_kernel_modules(); | |
1697 | if (ret < 0) { | |
1698 | goto error; | |
1699 | } | |
1700 | ||
1701 | /* Setup lttng kernel path */ | |
1702 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1703 | if (ret < 0) { | |
1704 | perror("asprintf lttng path"); | |
1705 | goto error; | |
1706 | } | |
1707 | ||
1708 | /* Open debugfs lttng */ | |
1709 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1710 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1711 | DBG("Failed to open %s", lttng_path); |
1712 | goto error; | |
8c0faa1d DG |
1713 | } |
1714 | ||
b73401da DG |
1715 | free(lttng_path); |
1716 | free(debugfs_path); | |
f3ed775e | 1717 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1718 | return; |
1719 | ||
1720 | error: | |
1721 | if (lttng_path) { | |
1722 | free(lttng_path); | |
1723 | } | |
1724 | if (debugfs_path) { | |
1725 | free(debugfs_path); | |
1726 | } | |
1727 | WARN("No kernel tracer available"); | |
1728 | kernel_tracer_fd = 0; | |
1729 | return; | |
f3ed775e | 1730 | } |
33a2b854 | 1731 | |
f3ed775e | 1732 | /* |
54d01ffb | 1733 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1734 | */ |
54d01ffb | 1735 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1736 | { |
f40799e8 | 1737 | int ret = 0; |
8c0faa1d | 1738 | |
3bd1e081 | 1739 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1740 | /* |
54d01ffb DG |
1741 | * Assign default kernel consumer socket if no consumer assigned to the |
1742 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1743 | * an extra security check. | |
d9800920 DG |
1744 | */ |
1745 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1746 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1747 | } |
1748 | ||
2bdd86d4 | 1749 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1750 | if (ret < 0) { |
f3ed775e DG |
1751 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1752 | goto error; | |
1753 | } | |
1d4b027a | 1754 | |
3bd1e081 | 1755 | session->consumer_fds_sent = 1; |
f3ed775e | 1756 | } |
1d4b027a DG |
1757 | |
1758 | error: | |
1759 | return ret; | |
8c0faa1d DG |
1760 | } |
1761 | ||
0177d773 DG |
1762 | /* |
1763 | * Create an UST session and add it to the session ust list. | |
1764 | */ | |
44d3bd01 DG |
1765 | static int create_ust_session(struct ltt_session *session, |
1766 | struct lttng_domain *domain) | |
0177d773 | 1767 | { |
44d3bd01 | 1768 | int ret; |
48842b30 | 1769 | unsigned int uid; |
13384287 | 1770 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1771 | |
1772 | switch (domain->type) { | |
48842b30 | 1773 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1774 | break; |
1775 | default: | |
13384287 | 1776 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1777 | goto error; |
1778 | } | |
0177d773 DG |
1779 | |
1780 | DBG("Creating UST session"); | |
1781 | ||
44e96653 | 1782 | uid = session->uid; |
48842b30 | 1783 | lus = trace_ust_create_session(session->path, uid, domain); |
0177d773 | 1784 | if (lus == NULL) { |
44d3bd01 | 1785 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1786 | goto error; |
1787 | } | |
1788 | ||
48842b30 | 1789 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1790 | geteuid(), allowed_group()); |
1791 | if (ret < 0) { | |
1792 | if (ret != -EEXIST) { | |
1793 | ERR("Trace directory creation error"); | |
44d3bd01 | 1794 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1795 | goto error; |
1796 | } | |
1797 | } | |
1798 | ||
f6a9efaa DG |
1799 | /* The domain type dictate different actions on session creation */ |
1800 | switch (domain->type) { | |
48842b30 DG |
1801 | case LTTNG_DOMAIN_UST: |
1802 | /* No ustctl for the global UST domain */ | |
1803 | break; | |
1804 | default: | |
36dc12cc | 1805 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1806 | goto error; |
0177d773 | 1807 | } |
f6a9efaa | 1808 | session->ust_session = lus; |
44d3bd01 DG |
1809 | |
1810 | return LTTCOMM_OK; | |
0177d773 DG |
1811 | |
1812 | error: | |
1813 | free(lus); | |
1814 | return ret; | |
1815 | } | |
1816 | ||
333f285e | 1817 | /* |
d063d709 | 1818 | * Create a kernel tracer session then create the default channel. |
333f285e | 1819 | */ |
f3ed775e | 1820 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1821 | { |
f3ed775e | 1822 | int ret; |
f3ed775e DG |
1823 | |
1824 | DBG("Creating kernel session"); | |
1825 | ||
1826 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1827 | if (ret < 0) { | |
1828 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1829 | goto error; | |
333f285e DG |
1830 | } |
1831 | ||
d9800920 | 1832 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1833 | if (kconsumer_data.cmd_sock) { |
1834 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1835 | } |
1836 | ||
63053e7c DG |
1837 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1838 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1839 | if (ret < 0) { |
996b65c8 | 1840 | if (ret != -EEXIST) { |
7a485870 DG |
1841 | ERR("Trace directory creation error"); |
1842 | goto error; | |
1843 | } | |
1844 | } | |
1845 | ||
f3ed775e DG |
1846 | error: |
1847 | return ret; | |
333f285e DG |
1848 | } |
1849 | ||
6c9cc2ab DG |
1850 | /* |
1851 | * Using the session list, filled a lttng_session array to send back to the | |
1852 | * client for session listing. | |
1853 | * | |
1854 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1855 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1856 | */ |
1857 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1858 | { | |
1859 | int i = 0; | |
1860 | struct ltt_session *session; | |
1861 | ||
1862 | DBG("Getting all available session"); | |
1863 | /* | |
1864 | * Iterate over session list and append data after the control struct in | |
1865 | * the buffer. | |
1866 | */ | |
1867 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1868 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1869 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1870 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1871 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1872 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1873 | i++; |
1874 | } | |
1875 | } | |
1876 | ||
9f19cc17 DG |
1877 | /* |
1878 | * Fill lttng_channel array of all channels. | |
1879 | */ | |
b551a063 | 1880 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1881 | struct lttng_channel *channels) |
1882 | { | |
1883 | int i = 0; | |
1884 | struct ltt_kernel_channel *kchan; | |
1885 | ||
1886 | DBG("Listing channels for session %s", session->name); | |
1887 | ||
b551a063 DG |
1888 | switch (domain) { |
1889 | case LTTNG_DOMAIN_KERNEL: | |
1890 | /* Kernel channels */ | |
1891 | if (session->kernel_session != NULL) { | |
1892 | cds_list_for_each_entry(kchan, | |
1893 | &session->kernel_session->channel_list.head, list) { | |
1894 | /* Copy lttng_channel struct to array */ | |
1895 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1896 | channels[i].enabled = kchan->enabled; | |
1897 | i++; | |
1898 | } | |
1899 | } | |
1900 | break; | |
1901 | case LTTNG_DOMAIN_UST: | |
1902 | { | |
1903 | struct cds_lfht_iter iter; | |
1904 | struct ltt_ust_channel *uchan; | |
1905 | ||
1906 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1907 | &iter, uchan, node) { | |
1908 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1909 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1910 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1911 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1912 | channels[i].attr.switch_timer_interval = | |
1913 | uchan->attr.switch_timer_interval; | |
1914 | channels[i].attr.read_timer_interval = | |
1915 | uchan->attr.read_timer_interval; | |
1916 | channels[i].attr.output = uchan->attr.output; | |
befe0905 | 1917 | i++; |
b551a063 DG |
1918 | } |
1919 | break; | |
1920 | } | |
1921 | default: | |
1922 | break; | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | /* | |
1927 | * Create a list of ust global domain events. | |
1928 | */ | |
1929 | static int list_lttng_ust_global_events(char *channel_name, | |
1930 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1931 | { | |
1932 | int i = 0, ret = 0; | |
1933 | unsigned int nb_event = 0; | |
1934 | struct cds_lfht_iter iter; | |
1935 | struct ltt_ust_channel *uchan; | |
1936 | struct ltt_ust_event *uevent; | |
1937 | struct lttng_event *tmp; | |
1938 | ||
1939 | DBG("Listing UST global events for channel %s", channel_name); | |
1940 | ||
1941 | rcu_read_lock(); | |
1942 | ||
1943 | /* Count events in all channels */ | |
1944 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1945 | nb_event += hashtable_get_count(uchan->events); | |
1946 | } | |
1947 | ||
1948 | if (nb_event == 0) { | |
1949 | ret = nb_event; | |
1950 | goto error; | |
1951 | } | |
1952 | ||
1953 | DBG3("Listing UST global %d events", nb_event); | |
1954 | ||
1955 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1956 | if (tmp == NULL) { | |
1957 | ret = -LTTCOMM_FATAL; | |
1958 | goto error; | |
1959 | } | |
1960 | ||
1961 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1962 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
1963 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1964 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
37357452 | 1965 | tmp[i].enabled = uevent->enabled; |
b551a063 DG |
1966 | switch (uevent->attr.instrumentation) { |
1967 | case LTTNG_UST_TRACEPOINT: | |
1968 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1969 | break; | |
1970 | case LTTNG_UST_PROBE: | |
1971 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1972 | break; | |
1973 | case LTTNG_UST_FUNCTION: | |
1974 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1975 | break; | |
1976 | } | |
9f19cc17 DG |
1977 | i++; |
1978 | } | |
1979 | } | |
1980 | ||
b551a063 DG |
1981 | ret = nb_event; |
1982 | *events = tmp; | |
1983 | ||
1984 | error: | |
1985 | rcu_read_unlock(); | |
1986 | return ret; | |
9f19cc17 DG |
1987 | } |
1988 | ||
1989 | /* | |
b551a063 | 1990 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 1991 | */ |
b551a063 DG |
1992 | static int list_lttng_kernel_events(char *channel_name, |
1993 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 1994 | { |
b551a063 DG |
1995 | int i = 0, ret; |
1996 | unsigned int nb_event; | |
9f19cc17 | 1997 | struct ltt_kernel_event *event; |
b551a063 DG |
1998 | struct ltt_kernel_channel *kchan; |
1999 | ||
2000 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2001 | if (kchan == NULL) { | |
2002 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2003 | goto error; | |
2004 | } | |
2005 | ||
2006 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2007 | |
2008 | DBG("Listing events for channel %s", kchan->channel->name); | |
2009 | ||
b551a063 DG |
2010 | if (nb_event == 0) { |
2011 | ret = nb_event; | |
2012 | goto error; | |
2013 | } | |
2014 | ||
2015 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2016 | if (*events == NULL) { | |
2017 | ret = LTTCOMM_FATAL; | |
2018 | goto error; | |
2019 | } | |
2020 | ||
9f19cc17 DG |
2021 | /* Kernel channels */ |
2022 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2023 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2024 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2025 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2026 | switch (event->event->instrumentation) { |
2027 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2028 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2029 | break; |
2030 | case LTTNG_KERNEL_KPROBE: | |
2031 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2032 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2033 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2034 | sizeof(struct lttng_kernel_kprobe)); |
2035 | break; | |
2036 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2037 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2038 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2039 | sizeof(struct lttng_kernel_function)); |
2040 | break; | |
0133c199 | 2041 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2042 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2043 | break; |
a54bd42d | 2044 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2045 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2046 | break; |
7a3d1328 MD |
2047 | case LTTNG_KERNEL_ALL: |
2048 | assert(0); | |
2049 | break; | |
9f19cc17 DG |
2050 | } |
2051 | i++; | |
2052 | } | |
b551a063 DG |
2053 | |
2054 | return nb_event; | |
2055 | ||
2056 | error: | |
2057 | return ret; | |
9f19cc17 DG |
2058 | } |
2059 | ||
fac6795d | 2060 | /* |
54d01ffb | 2061 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2062 | */ |
54d01ffb DG |
2063 | static int cmd_disable_channel(struct ltt_session *session, |
2064 | int domain, char *channel_name) | |
fac6795d | 2065 | { |
54d01ffb | 2066 | int ret; |
379473d2 | 2067 | |
54d01ffb DG |
2068 | switch (domain) { |
2069 | case LTTNG_DOMAIN_KERNEL: | |
2070 | ret = channel_kernel_disable(session->kernel_session, | |
2071 | channel_name); | |
2072 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
2073 | goto error; |
2074 | } | |
54d01ffb DG |
2075 | |
2076 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 2077 | break; |
44d3bd01 DG |
2078 | case LTTNG_DOMAIN_UST_PID: |
2079 | break; | |
d0254c7c | 2080 | default: |
44d3bd01 | 2081 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 2082 | goto error; |
20fe2104 DG |
2083 | } |
2084 | ||
54d01ffb | 2085 | ret = LTTCOMM_OK; |
d65106b1 | 2086 | |
54d01ffb DG |
2087 | error: |
2088 | return ret; | |
2089 | } | |
2090 | ||
56fff090 DG |
2091 | /* |
2092 | * Copy channel from attributes and set it in the application channel list. | |
2093 | */ | |
f6a9efaa | 2094 | /* |
56fff090 DG |
2095 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2096 | struct lttng_channel *attr, struct ust_app *app) | |
2097 | { | |
2098 | int ret; | |
2099 | struct ltt_ust_channel *uchan, *new_chan; | |
2100 | ||
f6a9efaa | 2101 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2102 | if (uchan == NULL) { |
2103 | ret = LTTCOMM_FATAL; | |
2104 | goto error; | |
2105 | } | |
2106 | ||
2107 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2108 | if (new_chan == NULL) { | |
2109 | PERROR("malloc ltt_ust_channel"); | |
2110 | ret = LTTCOMM_FATAL; | |
2111 | goto error; | |
2112 | } | |
2113 | ||
2114 | ret = channel_ust_copy(new_chan, uchan); | |
2115 | if (ret < 0) { | |
2116 | ret = LTTCOMM_FATAL; | |
2117 | goto error; | |
2118 | } | |
2119 | ||
56fff090 DG |
2120 | error: |
2121 | return ret; | |
2122 | } | |
f6a9efaa | 2123 | */ |
56fff090 | 2124 | |
54d01ffb DG |
2125 | /* |
2126 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2127 | */ | |
44d3bd01 DG |
2128 | static int cmd_enable_channel(struct ltt_session *session, |
2129 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
2130 | { |
2131 | int ret; | |
f6a9efaa DG |
2132 | struct ltt_ust_session *usess = session->ust_session; |
2133 | ||
5d56b5aa | 2134 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2135 | |
44d3bd01 DG |
2136 | switch (domain->type) { |
2137 | case LTTNG_DOMAIN_KERNEL: | |
2138 | { | |
2139 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2140 | |
44d3bd01 DG |
2141 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2142 | session->kernel_session); | |
2143 | if (kchan == NULL) { | |
2144 | ret = channel_kernel_create(session->kernel_session, | |
2145 | attr, kernel_poll_pipe[1]); | |
2146 | } else { | |
2147 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2148 | } | |
2149 | ||
2150 | if (ret != LTTCOMM_OK) { | |
2151 | goto error; | |
2152 | } | |
2153 | ||
2154 | kernel_wait_quiescent(kernel_tracer_fd); | |
2155 | break; | |
2156 | } | |
f6a9efaa DG |
2157 | case LTTNG_DOMAIN_UST: |
2158 | { | |
2159 | struct ltt_ust_channel *uchan; | |
2160 | ||
48842b30 | 2161 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2162 | |
48842b30 | 2163 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2164 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2165 | attr->name); | |
2166 | if (uchan == NULL) { | |
48842b30 | 2167 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2168 | if (uchan == NULL) { |
2169 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2170 | goto error; | |
2171 | } | |
d5cd1f34 | 2172 | |
f6a9efaa DG |
2173 | rcu_read_lock(); |
2174 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2175 | rcu_read_unlock(); | |
48842b30 | 2176 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa DG |
2177 | } else { |
2178 | ret = LTTCOMM_UST_CHAN_EXIST; | |
2179 | goto error; | |
2180 | } | |
2181 | ||
421cb601 | 2182 | /* Add channel to all registered applications */ |
5b4a0ec0 | 2183 | ret = ust_app_create_channel_all(usess, uchan); |
509cbaf8 | 2184 | if (ret != 0) { |
48842b30 DG |
2185 | goto error; |
2186 | } | |
f6a9efaa | 2187 | |
37357452 DG |
2188 | uchan->enabled = 1; |
2189 | ||
f6a9efaa DG |
2190 | break; |
2191 | } | |
44d3bd01 DG |
2192 | case LTTNG_DOMAIN_UST_PID: |
2193 | { | |
f6a9efaa | 2194 | /* |
56fff090 DG |
2195 | int sock; |
2196 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 2197 | struct ltt_ust_session *usess; |
56fff090 | 2198 | struct ust_app *app; |
44d3bd01 DG |
2199 | |
2200 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
2201 | domain->attr.pid); | |
2202 | if (usess == NULL) { | |
2203 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2204 | goto error; | |
2205 | } | |
2206 | ||
56fff090 | 2207 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
2208 | if (app == NULL) { |
2209 | ret = LTTCOMM_APP_NOT_FOUND; | |
2210 | goto error; | |
2211 | } | |
56fff090 | 2212 | sock = app->sock; |
44d3bd01 DG |
2213 | |
2214 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
2215 | if (uchan == NULL) { | |
56fff090 | 2216 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 2217 | } else { |
56fff090 | 2218 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
2219 | } |
2220 | ||
2221 | if (ret != LTTCOMM_OK) { | |
2222 | goto error; | |
2223 | } | |
2224 | ||
56fff090 DG |
2225 | ret = copy_ust_channel_to_app(usess, attr, app); |
2226 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
2227 | goto error; |
2228 | } | |
2229 | ||
44d3bd01 DG |
2230 | DBG("UST channel %s created for app sock %d with pid %d", |
2231 | attr->name, app->sock, domain->attr.pid); | |
f6a9efaa DG |
2232 | */ |
2233 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2234 | goto error; | |
44d3bd01 DG |
2235 | } |
2236 | default: | |
2237 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2238 | goto error; | |
54d01ffb DG |
2239 | } |
2240 | ||
2241 | ret = LTTCOMM_OK; | |
2242 | ||
2243 | error: | |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2249 | */ | |
2250 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2251 | char *channel_name, char *event_name) | |
2252 | { | |
2253 | int ret; | |
54d01ffb DG |
2254 | |
2255 | switch (domain) { | |
2256 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2257 | { |
2258 | struct ltt_kernel_channel *kchan; | |
2259 | ||
54d01ffb DG |
2260 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2261 | session->kernel_session); | |
2262 | if (kchan == NULL) { | |
2263 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2264 | goto error; | |
d65106b1 DG |
2265 | } |
2266 | ||
7a3d1328 | 2267 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2268 | if (ret != LTTCOMM_OK) { |
2269 | goto error; | |
2270 | } | |
2271 | ||
2272 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2273 | break; |
2bdd86d4 MD |
2274 | } |
2275 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2276 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2277 | case LTTNG_DOMAIN_UST_PID: | |
2278 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2279 | default: |
2bdd86d4 | 2280 | /* TODO: Other UST domains */ |
54d01ffb DG |
2281 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2282 | goto error; | |
d65106b1 | 2283 | } |
26cc6b4e | 2284 | |
54d01ffb DG |
2285 | ret = LTTCOMM_OK; |
2286 | ||
2287 | error: | |
2288 | return ret; | |
2289 | } | |
2290 | ||
2291 | /* | |
2292 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2293 | */ | |
2294 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2295 | char *channel_name) | |
2296 | { | |
2297 | int ret; | |
2298 | struct ltt_kernel_channel *kchan; | |
2299 | ||
2300 | switch (domain) { | |
2301 | case LTTNG_DOMAIN_KERNEL: | |
2302 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2303 | session->kernel_session); | |
2304 | if (kchan == NULL) { | |
2305 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2306 | goto error; | |
26cc6b4e DG |
2307 | } |
2308 | ||
54d01ffb DG |
2309 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2310 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2311 | goto error; |
26cc6b4e DG |
2312 | } |
2313 | ||
54d01ffb | 2314 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2315 | break; |
54d01ffb DG |
2316 | default: |
2317 | /* TODO: Userspace tracing */ | |
2318 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2319 | goto error; | |
26cc6b4e | 2320 | } |
e953ef25 | 2321 | |
54d01ffb | 2322 | ret = LTTCOMM_OK; |
e953ef25 | 2323 | |
54d01ffb DG |
2324 | error: |
2325 | return ret; | |
2326 | } | |
f5177a38 | 2327 | |
54d01ffb DG |
2328 | /* |
2329 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2330 | */ | |
2331 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2332 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2333 | { | |
2334 | int ret; | |
f5177a38 | 2335 | |
54d01ffb DG |
2336 | switch (domain) { |
2337 | case LTTNG_DOMAIN_KERNEL: | |
2338 | /* Add kernel context to kernel tracer */ | |
2339 | ret = context_kernel_add(session->kernel_session, ctx, | |
2340 | event_name, channel_name); | |
2341 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2342 | goto error; |
e953ef25 | 2343 | } |
2bdd86d4 MD |
2344 | break; |
2345 | case LTTNG_DOMAIN_UST: | |
2346 | { | |
48842b30 DG |
2347 | /* |
2348 | struct ltt_ust_session *usess; | |
e953ef25 | 2349 | |
48842b30 DG |
2350 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2351 | ret = context_ust_add(usess, ctx, | |
2352 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2353 | if (ret != LTTCOMM_OK) { |
2354 | goto error; | |
2355 | } | |
2356 | } | |
e953ef25 | 2357 | break; |
48842b30 | 2358 | */ |
2bdd86d4 | 2359 | } |
54d01ffb | 2360 | default: |
2bdd86d4 | 2361 | /* TODO: UST other domains */ |
54d01ffb DG |
2362 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2363 | goto error; | |
e953ef25 | 2364 | } |
950131af | 2365 | |
54d01ffb | 2366 | ret = LTTCOMM_OK; |
950131af | 2367 | |
54d01ffb DG |
2368 | error: |
2369 | return ret; | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2374 | */ | |
2375 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2376 | char *channel_name, struct lttng_event *event) | |
2377 | { | |
2378 | int ret; | |
f6cd6b0f | 2379 | struct lttng_channel *attr; |
48842b30 | 2380 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2381 | |
2382 | switch (domain) { | |
2383 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2384 | { |
2385 | struct ltt_kernel_channel *kchan; | |
2386 | ||
54d01ffb DG |
2387 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2388 | session->kernel_session); | |
2389 | if (kchan == NULL) { | |
f6cd6b0f DG |
2390 | attr = channel_new_default_attr(domain); |
2391 | if (attr == NULL) { | |
2392 | ret = LTTCOMM_FATAL; | |
2393 | goto error; | |
2394 | } | |
2395 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2396 | ||
54d01ffb | 2397 | /* This call will notify the kernel thread */ |
44d3bd01 | 2398 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2399 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2400 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2401 | goto error; |
2402 | } | |
54d01ffb | 2403 | } |
950131af | 2404 | |
54d01ffb DG |
2405 | /* Get the newly created kernel channel pointer */ |
2406 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2407 | session->kernel_session); | |
2408 | if (kchan == NULL) { | |
2409 | /* This sould not happen... */ | |
2410 | ret = LTTCOMM_FATAL; | |
2411 | goto error; | |
2412 | } | |
f5177a38 | 2413 | |
48842b30 DG |
2414 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2415 | event); | |
54d01ffb | 2416 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2417 | goto error; |
950131af DG |
2418 | } |
2419 | ||
54d01ffb | 2420 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2421 | break; |
2bdd86d4 MD |
2422 | } |
2423 | case LTTNG_DOMAIN_UST: | |
2424 | { | |
48842b30 DG |
2425 | struct ltt_ust_channel *uchan; |
2426 | struct ltt_ust_event *uevent; | |
2bdd86d4 | 2427 | |
48842b30 DG |
2428 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2429 | channel_name); | |
2430 | if (uchan == NULL) { | |
2431 | /* TODO: Create default channel */ | |
2432 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2433 | goto error; | |
2434 | } | |
2bdd86d4 | 2435 | |
48842b30 DG |
2436 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2437 | if (uevent == NULL) { | |
2438 | uevent = trace_ust_create_event(event); | |
2439 | if (uevent == NULL) { | |
2bdd86d4 MD |
2440 | ret = LTTCOMM_FATAL; |
2441 | goto error; | |
2442 | } | |
d5cd1f34 | 2443 | |
48842b30 | 2444 | } |
2bdd86d4 | 2445 | |
5b4a0ec0 | 2446 | ret = ust_app_create_event_all(usess, uchan, uevent); |
48842b30 DG |
2447 | if (ret < 0) { |
2448 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2449 | goto error; | |
2bdd86d4 | 2450 | } |
487cf67c | 2451 | |
d5cd1f34 | 2452 | /* Add ltt ust event to channel */ |
487cf67c DG |
2453 | rcu_read_lock(); |
2454 | hashtable_add_unique(uchan->events, &uevent->node); | |
2455 | rcu_read_unlock(); | |
d5cd1f34 | 2456 | |
37357452 DG |
2457 | uevent->enabled = 1; |
2458 | ||
d5cd1f34 DG |
2459 | DBG3("UST ltt event %s added to channel %s", uevent->attr.name, |
2460 | uchan->name); | |
2bdd86d4 MD |
2461 | break; |
2462 | } | |
2463 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2464 | case LTTNG_DOMAIN_UST_PID: | |
2465 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2466 | default: |
54d01ffb DG |
2467 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2468 | goto error; | |
950131af | 2469 | } |
d36b8583 | 2470 | |
54d01ffb | 2471 | ret = LTTCOMM_OK; |
d36b8583 | 2472 | |
54d01ffb DG |
2473 | error: |
2474 | return ret; | |
2475 | } | |
7d29a247 | 2476 | |
54d01ffb DG |
2477 | /* |
2478 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2479 | */ | |
2480 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2481 | char *channel_name, int event_type) |
54d01ffb DG |
2482 | { |
2483 | int ret; | |
2484 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2485 | |
54d01ffb DG |
2486 | switch (domain) { |
2487 | case LTTNG_DOMAIN_KERNEL: | |
2488 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2489 | session->kernel_session); | |
2490 | if (kchan == NULL) { | |
2491 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2492 | ret = channel_kernel_create(session->kernel_session, NULL, |
2493 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2494 | if (ret != LTTCOMM_OK) { |
2495 | goto error; | |
d36b8583 | 2496 | } |
54d01ffb | 2497 | } |
0d0c377a | 2498 | |
54d01ffb DG |
2499 | /* Get the newly created kernel channel pointer */ |
2500 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2501 | session->kernel_session); | |
2502 | if (kchan == NULL) { | |
2503 | /* This sould not happen... */ | |
2504 | ret = LTTCOMM_FATAL; | |
2505 | goto error; | |
2506 | } | |
0fdd1e2c | 2507 | |
7a3d1328 MD |
2508 | switch (event_type) { |
2509 | case LTTNG_KERNEL_SYSCALL: | |
2510 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2511 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2512 | break; |
2513 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2514 | /* |
7a3d1328 MD |
2515 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2516 | * events already registered to the channel. | |
8c9ae521 | 2517 | */ |
7a3d1328 MD |
2518 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2519 | kchan, kernel_tracer_fd); | |
2520 | break; | |
2521 | case LTTNG_KERNEL_ALL: | |
2522 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2523 | ret = event_kernel_enable_all(session->kernel_session, |
2524 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2525 | break; |
2526 | default: | |
2527 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2528 | goto error; | |
8c9ae521 | 2529 | } |
54d01ffb | 2530 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2531 | goto error; |
d36b8583 DG |
2532 | } |
2533 | ||
54d01ffb | 2534 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2535 | break; |
54d01ffb DG |
2536 | default: |
2537 | /* TODO: Userspace tracing */ | |
2538 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2539 | goto error; | |
d36b8583 | 2540 | } |
f3ed775e | 2541 | |
54d01ffb DG |
2542 | ret = LTTCOMM_OK; |
2543 | ||
2544 | error: | |
2545 | return ret; | |
2546 | } | |
2547 | ||
2548 | /* | |
2549 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2550 | */ | |
2551 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2552 | { | |
2553 | int ret; | |
2554 | ssize_t nb_events = 0; | |
2555 | ||
2556 | switch (domain) { | |
2557 | case LTTNG_DOMAIN_KERNEL: | |
2558 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2559 | if (nb_events < 0) { | |
2560 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2561 | goto error; | |
894be886 | 2562 | } |
54d01ffb | 2563 | break; |
b551a063 DG |
2564 | case LTTNG_DOMAIN_UST: |
2565 | nb_events = ust_app_list_events(events); | |
2566 | if (nb_events < 0) { | |
2567 | ret = LTTCOMM_UST_LIST_FAIL; | |
2568 | goto error; | |
2569 | } | |
2570 | break; | |
54d01ffb | 2571 | default: |
54d01ffb DG |
2572 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2573 | goto error; | |
2574 | } | |
894be886 | 2575 | |
54d01ffb | 2576 | return nb_events; |
7d29a247 | 2577 | |
54d01ffb DG |
2578 | error: |
2579 | /* Return negative value to differentiate return code */ | |
2580 | return -ret; | |
2581 | } | |
b389abbe | 2582 | |
54d01ffb DG |
2583 | /* |
2584 | * Command LTTNG_START_TRACE processed by the client thread. | |
2585 | */ | |
2586 | static int cmd_start_trace(struct ltt_session *session) | |
2587 | { | |
2588 | int ret; | |
54d01ffb | 2589 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2590 | struct ltt_ust_session *usess; |
b389abbe | 2591 | |
54d01ffb DG |
2592 | /* Short cut */ |
2593 | ksession = session->kernel_session; | |
b9d9b220 | 2594 | usess = session->ust_session; |
5eb91c98 | 2595 | |
464dd62d MD |
2596 | if (session->enabled) |
2597 | return LTTCOMM_UST_START_FAIL; | |
2598 | session->enabled = 1; | |
2599 | ||
54d01ffb DG |
2600 | /* Kernel tracing */ |
2601 | if (ksession != NULL) { | |
2bdd86d4 MD |
2602 | struct ltt_kernel_channel *kchan; |
2603 | ||
54d01ffb DG |
2604 | /* Open kernel metadata */ |
2605 | if (ksession->metadata == NULL) { | |
2606 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2607 | if (ret < 0) { | |
2608 | ret = LTTCOMM_KERN_META_FAIL; | |
2609 | goto error; | |
b389abbe | 2610 | } |
54d01ffb | 2611 | } |
7d29a247 | 2612 | |
54d01ffb DG |
2613 | /* Open kernel metadata stream */ |
2614 | if (ksession->metadata_stream_fd == 0) { | |
2615 | ret = kernel_open_metadata_stream(ksession); | |
2616 | if (ret < 0) { | |
2617 | ERR("Kernel create metadata stream failed"); | |
2618 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2619 | goto error; | |
2620 | } | |
2621 | } | |
2622 | ||
2623 | /* For each channel */ | |
2624 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2625 | if (kchan->stream_count == 0) { | |
2626 | ret = kernel_open_channel_stream(kchan); | |
2627 | if (ret < 0) { | |
2628 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2629 | goto error; |
2630 | } | |
54d01ffb DG |
2631 | /* Update the stream global counter */ |
2632 | ksession->stream_count_global += ret; | |
7d29a247 | 2633 | } |
54d01ffb DG |
2634 | } |
2635 | ||
2636 | /* Setup kernel consumer socket and send fds to it */ | |
2637 | ret = init_kernel_tracing(ksession); | |
2638 | if (ret < 0) { | |
2639 | ret = LTTCOMM_KERN_START_FAIL; | |
2640 | goto error; | |
2641 | } | |
2642 | ||
2643 | /* This start the kernel tracing */ | |
2644 | ret = kernel_start_session(ksession); | |
2645 | if (ret < 0) { | |
2646 | ret = LTTCOMM_KERN_START_FAIL; | |
2647 | goto error; | |
2648 | } | |
2649 | ||
2650 | /* Quiescent wait after starting trace */ | |
2651 | kernel_wait_quiescent(kernel_tracer_fd); | |
2652 | } | |
2653 | ||
36dc12cc | 2654 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2655 | if (usess) { |
2656 | usess->start_trace = 1; | |
36dc12cc | 2657 | |
b9d9b220 DG |
2658 | ret = ust_app_start_trace_all(usess); |
2659 | if (ret < 0) { | |
2660 | ret = LTTCOMM_UST_START_FAIL; | |
2661 | goto error; | |
2662 | } | |
2bdd86d4 | 2663 | } |
54d01ffb DG |
2664 | |
2665 | ret = LTTCOMM_OK; | |
2666 | ||
2667 | error: | |
2668 | return ret; | |
2669 | } | |
2670 | ||
2671 | /* | |
2672 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2673 | */ | |
2674 | static int cmd_stop_trace(struct ltt_session *session) | |
2675 | { | |
2676 | int ret; | |
2677 | struct ltt_kernel_channel *kchan; | |
2678 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2679 | struct ltt_ust_session *usess; |
54d01ffb DG |
2680 | |
2681 | /* Short cut */ | |
2682 | ksession = session->kernel_session; | |
8be98f9a | 2683 | usess = session->ust_session; |
54d01ffb | 2684 | |
464dd62d MD |
2685 | if (!session->enabled) |
2686 | return LTTCOMM_UST_START_FAIL; | |
2687 | session->enabled = 0; | |
2688 | ||
54d01ffb DG |
2689 | /* Kernel tracer */ |
2690 | if (ksession != NULL) { | |
2691 | DBG("Stop kernel tracing"); | |
2692 | ||
2693 | /* Flush all buffers before stopping */ | |
2694 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2695 | if (ret < 0) { | |
2696 | ERR("Kernel metadata flush failed"); | |
2697 | } | |
f34daff7 | 2698 | |
54d01ffb DG |
2699 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2700 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2701 | if (ret < 0) { |
54d01ffb | 2702 | ERR("Kernel flush buffer error"); |
7d29a247 | 2703 | } |
54d01ffb | 2704 | } |
19e70852 | 2705 | |
54d01ffb DG |
2706 | ret = kernel_stop_session(ksession); |
2707 | if (ret < 0) { | |
2708 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2709 | goto error; |
f3ed775e | 2710 | } |
54d01ffb DG |
2711 | |
2712 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2713 | } |
54d01ffb | 2714 | |
8be98f9a MD |
2715 | /* Flag session that trace should start automatically */ |
2716 | if (usess) { | |
2717 | usess->start_trace = 0; | |
2bdd86d4 | 2718 | |
8be98f9a | 2719 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2720 | if (ret < 0) { |
8be98f9a | 2721 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2722 | goto error; |
2723 | } | |
2bdd86d4 | 2724 | } |
54d01ffb DG |
2725 | |
2726 | ret = LTTCOMM_OK; | |
2727 | ||
2728 | error: | |
2729 | return ret; | |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2734 | */ | |
2735 | static int cmd_create_session(char *name, char *path) | |
2736 | { | |
2737 | int ret; | |
2738 | ||
2739 | ret = session_create(name, path); | |
2740 | if (ret != LTTCOMM_OK) { | |
2741 | goto error; | |
2742 | } | |
2743 | ||
2744 | ret = LTTCOMM_OK; | |
2745 | ||
2746 | error: | |
2747 | return ret; | |
2748 | } | |
2749 | ||
2750 | /* | |
2751 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2752 | */ | |
2753 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2754 | { | |
2755 | int ret; | |
2756 | ||
2757 | /* Clean kernel session teardown */ | |
2758 | teardown_kernel_session(session); | |
84cd17c6 MD |
2759 | /* UST session teardown */ |
2760 | teardown_ust_session(session); | |
54d01ffb DG |
2761 | |
2762 | /* | |
2763 | * Must notify the kernel thread here to update it's poll setin order | |
2764 | * to remove the channel(s)' fd just destroyed. | |
2765 | */ | |
2766 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2767 | if (ret < 0) { | |
2768 | perror("write kernel poll pipe"); | |
2769 | } | |
2770 | ||
271933a4 | 2771 | ret = session_destroy(session); |
54d01ffb DG |
2772 | |
2773 | return ret; | |
2774 | } | |
2775 | ||
2776 | /* | |
2777 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2778 | */ | |
2779 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2780 | { | |
2781 | int ret; | |
2782 | ||
2783 | switch (domain) { | |
2784 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2785 | { |
54d01ffb | 2786 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2787 | |
54d01ffb DG |
2788 | kcalibrate.type = calibrate->type; |
2789 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2790 | if (ret < 0) { |
54d01ffb DG |
2791 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2792 | goto error; | |
33a2b854 | 2793 | } |
54d01ffb DG |
2794 | break; |
2795 | } | |
2796 | default: | |
2797 | /* TODO: Userspace tracing */ | |
2798 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2799 | goto error; | |
2800 | } | |
33a2b854 | 2801 | |
54d01ffb | 2802 | ret = LTTCOMM_OK; |
33a2b854 | 2803 | |
54d01ffb DG |
2804 | error: |
2805 | return ret; | |
2806 | } | |
7d29a247 | 2807 | |
54d01ffb DG |
2808 | /* |
2809 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2810 | */ | |
2811 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2812 | char *sock_path) | |
2813 | { | |
2814 | int ret, sock; | |
b389abbe | 2815 | |
54d01ffb DG |
2816 | switch (domain) { |
2817 | case LTTNG_DOMAIN_KERNEL: | |
2818 | /* Can't register a consumer if there is already one */ | |
2819 | if (session->kernel_session->consumer_fd != 0) { | |
2820 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2821 | goto error; | |
2822 | } | |
2823 | ||
2824 | sock = lttcomm_connect_unix_sock(sock_path); | |
2825 | if (sock < 0) { | |
2826 | ret = LTTCOMM_CONNECT_FAIL; | |
2827 | goto error; | |
2828 | } | |
2829 | ||
2830 | session->kernel_session->consumer_fd = sock; | |
2831 | break; | |
2832 | default: | |
2833 | /* TODO: Userspace tracing */ | |
2834 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2835 | goto error; | |
2836 | } | |
2837 | ||
2838 | ret = LTTCOMM_OK; | |
2839 | ||
2840 | error: | |
2841 | return ret; | |
2842 | } | |
2843 | ||
2844 | /* | |
2845 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2846 | */ | |
2847 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2848 | struct lttng_domain **domains) | |
2849 | { | |
b551a063 | 2850 | int ret, index = 0; |
54d01ffb DG |
2851 | ssize_t nb_dom = 0; |
2852 | ||
2853 | if (session->kernel_session != NULL) { | |
b551a063 | 2854 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2855 | nb_dom++; |
2856 | } | |
2857 | ||
b551a063 DG |
2858 | if (session->ust_session != NULL) { |
2859 | DBG3("Listing domains found UST global domain"); | |
2860 | nb_dom++; | |
2861 | } | |
54d01ffb | 2862 | |
b551a063 | 2863 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2864 | if (*domains == NULL) { |
2865 | ret = -LTTCOMM_FATAL; | |
2866 | goto error; | |
2867 | } | |
2868 | ||
b551a063 DG |
2869 | if (session->kernel_session != NULL) { |
2870 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2871 | index++; | |
2872 | } | |
2873 | ||
2874 | if (session->ust_session != NULL) { | |
2875 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2876 | index++; | |
2877 | } | |
54d01ffb | 2878 | |
54d01ffb DG |
2879 | return nb_dom; |
2880 | ||
2881 | error: | |
2882 | return ret; | |
2883 | } | |
2884 | ||
2885 | /* | |
2886 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2887 | */ | |
b551a063 | 2888 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2889 | struct lttng_channel **channels) |
2890 | { | |
2891 | int ret; | |
2892 | ssize_t nb_chan = 0; | |
2893 | ||
b551a063 DG |
2894 | switch (domain) { |
2895 | case LTTNG_DOMAIN_KERNEL: | |
2896 | if (session->kernel_session != NULL) { | |
2897 | nb_chan = session->kernel_session->channel_count; | |
2898 | } | |
0df502fd | 2899 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
2900 | break; |
2901 | case LTTNG_DOMAIN_UST: | |
2902 | if (session->ust_session != NULL) { | |
2903 | nb_chan = hashtable_get_count( | |
2904 | session->ust_session->domain_global.channels); | |
2905 | } | |
0df502fd | 2906 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
2907 | break; |
2908 | default: | |
2909 | *channels = NULL; | |
2910 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2911 | goto error; |
2912 | } | |
2913 | ||
b551a063 DG |
2914 | if (nb_chan > 0) { |
2915 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2916 | if (*channels == NULL) { | |
2917 | ret = -LTTCOMM_FATAL; | |
2918 | goto error; | |
2919 | } | |
54d01ffb | 2920 | |
b551a063 DG |
2921 | list_lttng_channels(domain, session, *channels); |
2922 | } else { | |
2923 | *channels = NULL; | |
2924 | } | |
2bdd86d4 | 2925 | |
54d01ffb DG |
2926 | return nb_chan; |
2927 | ||
2928 | error: | |
2929 | return ret; | |
2930 | } | |
2931 | ||
2932 | /* | |
2933 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2934 | */ | |
b551a063 | 2935 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
2936 | char *channel_name, struct lttng_event **events) |
2937 | { | |
b551a063 | 2938 | int ret = 0; |
54d01ffb | 2939 | ssize_t nb_event = 0; |
54d01ffb | 2940 | |
b551a063 DG |
2941 | switch (domain) { |
2942 | case LTTNG_DOMAIN_KERNEL: | |
2943 | if (session->kernel_session != NULL) { | |
2944 | nb_event = list_lttng_kernel_events(channel_name, | |
2945 | session->kernel_session, events); | |
54d01ffb | 2946 | } |
b551a063 DG |
2947 | break; |
2948 | case LTTNG_DOMAIN_UST: | |
2949 | { | |
2950 | if (session->ust_session != NULL) { | |
2951 | nb_event = list_lttng_ust_global_events(channel_name, | |
2952 | &session->ust_session->domain_global, events); | |
2953 | } | |
2954 | break; | |
54d01ffb | 2955 | } |
b551a063 DG |
2956 | default: |
2957 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2958 | goto error; |
2959 | } | |
2960 | ||
b551a063 | 2961 | ret = nb_event; |
54d01ffb DG |
2962 | |
2963 | error: | |
2964 | return ret; | |
2965 | } | |
2966 | ||
2967 | /* | |
2968 | * Process the command requested by the lttng client within the command | |
2969 | * context structure. This function make sure that the return structure (llm) | |
2970 | * is set and ready for transmission before returning. | |
2971 | * | |
2972 | * Return any error encountered or 0 for success. | |
2973 | */ | |
2974 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2975 | { | |
2976 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2977 | int need_tracing_session = 1; |
54d01ffb DG |
2978 | |
2979 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2980 | ||
2981 | /* | |
2982 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2983 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2984 | * command. |
2985 | */ | |
2986 | switch(cmd_ctx->lsm->cmd_type) { | |
2987 | case LTTNG_LIST_SESSIONS: | |
2988 | case LTTNG_LIST_TRACEPOINTS: | |
2989 | case LTTNG_LIST_DOMAINS: | |
2990 | case LTTNG_LIST_CHANNELS: | |
2991 | case LTTNG_LIST_EVENTS: | |
2992 | break; | |
2993 | default: | |
2994 | /* Setup lttng message with no payload */ | |
2995 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2996 | if (ret < 0) { | |
2997 | /* This label does not try to unlock the session */ | |
2998 | goto init_setup_error; | |
2999 | } | |
3000 | } | |
3001 | ||
3002 | /* Commands that DO NOT need a session. */ | |
3003 | switch (cmd_ctx->lsm->cmd_type) { | |
3004 | case LTTNG_CALIBRATE: | |
3005 | case LTTNG_CREATE_SESSION: | |
3006 | case LTTNG_LIST_SESSIONS: | |
3007 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3008 | need_tracing_session = 0; |
54d01ffb DG |
3009 | break; |
3010 | default: | |
3011 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3012 | session_lock_list(); |
54d01ffb | 3013 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3014 | session_unlock_list(); |
54d01ffb DG |
3015 | if (cmd_ctx->session == NULL) { |
3016 | if (cmd_ctx->lsm->session.name != NULL) { | |
3017 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3018 | } else { | |
3019 | /* If no session name specified */ | |
3020 | ret = LTTCOMM_SELECT_SESS; | |
3021 | } | |
3022 | goto error; | |
3023 | } else { | |
3024 | /* Acquire lock for the session */ | |
3025 | session_lock(cmd_ctx->session); | |
3026 | } | |
3027 | break; | |
3028 | } | |
b389abbe | 3029 | |
54d01ffb DG |
3030 | /* |
3031 | * Check domain type for specific "pre-action". | |
3032 | */ | |
3033 | switch (cmd_ctx->lsm->domain.type) { | |
3034 | case LTTNG_DOMAIN_KERNEL: | |
3035 | /* Kernel tracer check */ | |
3036 | if (kernel_tracer_fd == 0) { | |
3037 | /* Basically, load kernel tracer modules */ | |
3038 | init_kernel_tracer(); | |
3039 | if (kernel_tracer_fd == 0) { | |
3040 | ret = LTTCOMM_KERN_NA; | |
3041 | goto error; | |
3042 | } | |
3043 | } | |
5eb91c98 | 3044 | |
54d01ffb | 3045 | /* Need a session for kernel command */ |
44d3bd01 | 3046 | if (need_tracing_session) { |
54d01ffb DG |
3047 | if (cmd_ctx->session->kernel_session == NULL) { |
3048 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3049 | if (ret < 0) { |
54d01ffb | 3050 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3051 | goto error; |
3052 | } | |
b389abbe | 3053 | } |
7d29a247 | 3054 | |
54d01ffb | 3055 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3056 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3057 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3058 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3059 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3060 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3061 | if (ret < 0) { |
54d01ffb DG |
3062 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3063 | goto error; | |
950131af | 3064 | } |
3ff2ecac MD |
3065 | } else { |
3066 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3067 | } |
0d0c377a | 3068 | } |
54d01ffb | 3069 | break; |
2bdd86d4 | 3070 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3071 | { |
44d3bd01 | 3072 | if (need_tracing_session) { |
f6a9efaa | 3073 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3074 | ret = create_ust_session(cmd_ctx->session, |
3075 | &cmd_ctx->lsm->domain); | |
3076 | if (ret != LTTCOMM_OK) { | |
3077 | goto error; | |
3078 | } | |
3079 | } | |
7753dea8 MD |
3080 | /* Start the UST consumer daemons */ |
3081 | /* 64-bit */ | |
3082 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
3083 | if (consumerd64_bindir[0] != '\0' && | |
3084 | ustconsumer64_data.pid == 0 && | |
2bdd86d4 | 3085 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3086 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3087 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3088 | if (ret < 0) { |
7753dea8 MD |
3089 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3090 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3091 | goto error; |
3092 | } | |
48842b30 | 3093 | |
7753dea8 | 3094 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3095 | } else { |
7753dea8 MD |
3096 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3097 | } | |
3098 | /* 32-bit */ | |
3099 | if (consumerd32_bindir[0] != '\0' && | |
3100 | ustconsumer32_data.pid == 0 && | |
3101 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3102 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3103 | ret = start_consumerd(&ustconsumer32_data); | |
3104 | if (ret < 0) { | |
3105 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3106 | ust_consumerd32_fd = -EINVAL; | |
3107 | goto error; | |
3108 | } | |
3109 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3110 | } else { | |
3111 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3112 | } |
44d3bd01 DG |
3113 | } |
3114 | break; | |
48842b30 | 3115 | } |
54d01ffb | 3116 | default: |
54d01ffb DG |
3117 | break; |
3118 | } | |
33a2b854 | 3119 | |
54d01ffb DG |
3120 | /* Process by command type */ |
3121 | switch (cmd_ctx->lsm->cmd_type) { | |
3122 | case LTTNG_ADD_CONTEXT: | |
3123 | { | |
3124 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3125 | cmd_ctx->lsm->u.context.channel_name, | |
3126 | cmd_ctx->lsm->u.context.event_name, | |
3127 | &cmd_ctx->lsm->u.context.ctx); | |
3128 | break; | |
3129 | } | |
3130 | case LTTNG_DISABLE_CHANNEL: | |
3131 | { | |
3132 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3133 | cmd_ctx->lsm->u.disable.channel_name); | |
3134 | break; | |
3135 | } | |
3136 | case LTTNG_DISABLE_EVENT: | |
3137 | { | |
3138 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3139 | cmd_ctx->lsm->u.disable.channel_name, | |
3140 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3141 | ret = LTTCOMM_OK; |
3142 | break; | |
3143 | } | |
54d01ffb DG |
3144 | case LTTNG_DISABLE_ALL_EVENT: |
3145 | { | |
2bdd86d4 | 3146 | DBG("Disabling all events"); |
54d01ffb DG |
3147 | |
3148 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3149 | cmd_ctx->lsm->u.disable.channel_name); | |
3150 | break; | |
3151 | } | |
3152 | case LTTNG_ENABLE_CHANNEL: | |
3153 | { | |
44d3bd01 | 3154 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
3155 | &cmd_ctx->lsm->u.channel.chan); |
3156 | break; | |
3157 | } | |
3158 | case LTTNG_ENABLE_EVENT: | |
3159 | { | |
3160 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3161 | cmd_ctx->lsm->u.enable.channel_name, | |
3162 | &cmd_ctx->lsm->u.enable.event); | |
3163 | break; | |
3164 | } | |
3165 | case LTTNG_ENABLE_ALL_EVENT: | |
3166 | { | |
2bdd86d4 | 3167 | DBG("Enabling all events"); |
54d01ffb DG |
3168 | |
3169 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3170 | cmd_ctx->lsm->u.enable.channel_name, |
3171 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3172 | break; |
3173 | } | |
052da939 | 3174 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3175 | { |
9f19cc17 | 3176 | struct lttng_event *events; |
54d01ffb | 3177 | ssize_t nb_events; |
052da939 | 3178 | |
54d01ffb DG |
3179 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3180 | if (nb_events < 0) { | |
3181 | ret = -nb_events; | |
3182 | goto error; | |
2ef84c95 DG |
3183 | } |
3184 | ||
3185 | /* | |
3186 | * Setup lttng message with payload size set to the event list size in | |
3187 | * bytes and then copy list into the llm payload. | |
3188 | */ | |
052da939 | 3189 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3190 | if (ret < 0) { |
052da939 | 3191 | free(events); |
2ef84c95 DG |
3192 | goto setup_error; |
3193 | } | |
3194 | ||
3195 | /* Copy event list into message payload */ | |
9f19cc17 | 3196 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3197 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3198 | |
9f19cc17 | 3199 | free(events); |
2ef84c95 DG |
3200 | |
3201 | ret = LTTCOMM_OK; | |
3202 | break; | |
3203 | } | |
f3ed775e | 3204 | case LTTNG_START_TRACE: |
8c0faa1d | 3205 | { |
54d01ffb | 3206 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3207 | break; |
3208 | } | |
f3ed775e | 3209 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3210 | { |
54d01ffb | 3211 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3212 | break; |
3213 | } | |
5e16da05 MD |
3214 | case LTTNG_CREATE_SESSION: |
3215 | { | |
54d01ffb DG |
3216 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3217 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3218 | break; |
3219 | } | |
3220 | case LTTNG_DESTROY_SESSION: | |
3221 | { | |
54d01ffb DG |
3222 | ret = cmd_destroy_session(cmd_ctx->session, |
3223 | cmd_ctx->lsm->session.name); | |
5461b305 | 3224 | break; |
5e16da05 | 3225 | } |
9f19cc17 | 3226 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3227 | { |
54d01ffb DG |
3228 | ssize_t nb_dom; |
3229 | struct lttng_domain *domains; | |
5461b305 | 3230 | |
54d01ffb DG |
3231 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3232 | if (nb_dom < 0) { | |
3233 | ret = -nb_dom; | |
3234 | goto error; | |
ce3d728c | 3235 | } |
520ff687 | 3236 | |
54d01ffb | 3237 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3238 | if (ret < 0) { |
3239 | goto setup_error; | |
520ff687 | 3240 | } |
57167058 | 3241 | |
54d01ffb DG |
3242 | /* Copy event list into message payload */ |
3243 | memcpy(cmd_ctx->llm->payload, domains, | |
3244 | nb_dom * sizeof(struct lttng_domain)); | |
3245 | ||
3246 | free(domains); | |
5e16da05 | 3247 | |
5461b305 | 3248 | ret = LTTCOMM_OK; |
5e16da05 MD |
3249 | break; |
3250 | } | |
9f19cc17 | 3251 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3252 | { |
54d01ffb DG |
3253 | size_t nb_chan; |
3254 | struct lttng_channel *channels; | |
3255 | ||
b551a063 DG |
3256 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3257 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3258 | if (nb_chan < 0) { |
3259 | ret = -nb_chan; | |
3260 | goto error; | |
5461b305 | 3261 | } |
ca95a216 | 3262 | |
54d01ffb | 3263 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3264 | if (ret < 0) { |
3265 | goto setup_error; | |
3266 | } | |
9f19cc17 | 3267 | |
54d01ffb DG |
3268 | /* Copy event list into message payload */ |
3269 | memcpy(cmd_ctx->llm->payload, channels, | |
3270 | nb_chan * sizeof(struct lttng_channel)); | |
3271 | ||
3272 | free(channels); | |
9f19cc17 DG |
3273 | |
3274 | ret = LTTCOMM_OK; | |
5461b305 | 3275 | break; |
5e16da05 | 3276 | } |
9f19cc17 | 3277 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3278 | { |
b551a063 | 3279 | ssize_t nb_event; |
684d34d2 | 3280 | struct lttng_event *events = NULL; |
9f19cc17 | 3281 | |
b551a063 | 3282 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3283 | cmd_ctx->lsm->u.list.channel_name, &events); |
3284 | if (nb_event < 0) { | |
3285 | ret = -nb_event; | |
3286 | goto error; | |
5461b305 | 3287 | } |
ca95a216 | 3288 | |
54d01ffb | 3289 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3290 | if (ret < 0) { |
3291 | goto setup_error; | |
3292 | } | |
9f19cc17 | 3293 | |
54d01ffb DG |
3294 | /* Copy event list into message payload */ |
3295 | memcpy(cmd_ctx->llm->payload, events, | |
3296 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3297 | |
54d01ffb | 3298 | free(events); |
9f19cc17 DG |
3299 | |
3300 | ret = LTTCOMM_OK; | |
5461b305 | 3301 | break; |
5e16da05 MD |
3302 | } |
3303 | case LTTNG_LIST_SESSIONS: | |
3304 | { | |
54d01ffb | 3305 | session_lock_list(); |
5461b305 | 3306 | |
6c9cc2ab | 3307 | if (session_list_ptr->count == 0) { |
f3ed775e | 3308 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3309 | session_unlock_list(); |
5461b305 | 3310 | goto error; |
57167058 | 3311 | } |
5e16da05 | 3312 | |
6c9cc2ab DG |
3313 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3314 | session_list_ptr->count); | |
5461b305 | 3315 | if (ret < 0) { |
54d01ffb | 3316 | session_unlock_list(); |
5461b305 | 3317 | goto setup_error; |
e065084a | 3318 | } |
5e16da05 | 3319 | |
6c9cc2ab DG |
3320 | /* Filled the session array */ |
3321 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3322 | ||
54d01ffb | 3323 | session_unlock_list(); |
5e16da05 | 3324 | |
5461b305 | 3325 | ret = LTTCOMM_OK; |
5e16da05 MD |
3326 | break; |
3327 | } | |
d0254c7c MD |
3328 | case LTTNG_CALIBRATE: |
3329 | { | |
54d01ffb DG |
3330 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3331 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3332 | break; |
3333 | } | |
d9800920 DG |
3334 | case LTTNG_REGISTER_CONSUMER: |
3335 | { | |
54d01ffb DG |
3336 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3337 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3338 | break; |
3339 | } | |
5e16da05 | 3340 | default: |
5e16da05 | 3341 | ret = LTTCOMM_UND; |
5461b305 | 3342 | break; |
fac6795d DG |
3343 | } |
3344 | ||
5461b305 | 3345 | error: |
5461b305 DG |
3346 | if (cmd_ctx->llm == NULL) { |
3347 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3348 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3349 | goto setup_error; |
3350 | } | |
3351 | } | |
54d01ffb | 3352 | /* Set return code */ |
5461b305 | 3353 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3354 | setup_error: |
b5541356 | 3355 | if (cmd_ctx->session) { |
54d01ffb | 3356 | session_unlock(cmd_ctx->session); |
b5541356 | 3357 | } |
54d01ffb | 3358 | init_setup_error: |
8028d920 | 3359 | return ret; |
fac6795d DG |
3360 | } |
3361 | ||
1d4b027a | 3362 | /* |
d063d709 DG |
3363 | * This thread manage all clients request using the unix client socket for |
3364 | * communication. | |
1d4b027a DG |
3365 | */ |
3366 | static void *thread_manage_clients(void *data) | |
3367 | { | |
5eb91c98 DG |
3368 | int sock = 0, ret, i, pollfd; |
3369 | uint32_t revents, nb_fd; | |
273ea72c | 3370 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3371 | struct lttng_poll_event events; |
1d4b027a DG |
3372 | |
3373 | DBG("[thread] Manage client started"); | |
3374 | ||
f6a9efaa DG |
3375 | rcu_register_thread(); |
3376 | ||
1d4b027a DG |
3377 | ret = lttcomm_listen_unix_sock(client_sock); |
3378 | if (ret < 0) { | |
3379 | goto error; | |
3380 | } | |
3381 | ||
5eb91c98 DG |
3382 | /* |
3383 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3384 | * more will be added to this poll set. | |
3385 | */ | |
3386 | ret = create_thread_poll_set(&events, 2); | |
3387 | if (ret < 0) { | |
3388 | goto error; | |
3389 | } | |
273ea72c | 3390 | |
5eb91c98 DG |
3391 | /* Add the application registration socket */ |
3392 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3393 | if (ret < 0) { | |
3394 | goto error; | |
3395 | } | |
273ea72c | 3396 | |
bbd973c2 DG |
3397 | /* |
3398 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3399 | */ |
3400 | if (opt_sig_parent) { | |
3401 | kill(ppid, SIGCHLD); | |
3402 | } | |
3403 | ||
3404 | while (1) { | |
1d4b027a | 3405 | DBG("Accepting client command ..."); |
273ea72c | 3406 | |
5eb91c98 DG |
3407 | nb_fd = LTTNG_POLL_GETNB(&events); |
3408 | ||
273ea72c | 3409 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3410 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3411 | if (ret < 0) { |
273ea72c DG |
3412 | goto error; |
3413 | } | |
3414 | ||
5eb91c98 DG |
3415 | for (i = 0; i < nb_fd; i++) { |
3416 | /* Fetch once the poll data */ | |
3417 | revents = LTTNG_POLL_GETEV(&events, i); | |
3418 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3419 | ||
3420 | /* Thread quit pipe has been closed. Killing thread. */ | |
3421 | ret = check_thread_quit_pipe(pollfd, revents); | |
3422 | if (ret) { | |
3423 | goto error; | |
3424 | } | |
3425 | ||
3426 | /* Event on the registration socket */ | |
3427 | if (pollfd == client_sock) { | |
3428 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3429 | ERR("Client socket poll error"); | |
3430 | goto error; | |
3431 | } | |
3432 | } | |
3433 | } | |
3434 | ||
3435 | DBG("Wait for client response"); | |
3436 | ||
3437 | sock = lttcomm_accept_unix_sock(client_sock); | |
3438 | if (sock < 0) { | |
273ea72c | 3439 | goto error; |
273ea72c DG |
3440 | } |
3441 | ||
5eb91c98 | 3442 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3443 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3444 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3445 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3446 | goto error; |
5eb91c98 | 3447 | } |
1d4b027a | 3448 | |
5eb91c98 | 3449 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3450 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3451 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3452 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3453 | goto error; |
3454 | } | |
1d4b027a | 3455 | |
5eb91c98 DG |
3456 | cmd_ctx->llm = NULL; |
3457 | cmd_ctx->session = NULL; | |
1d4b027a | 3458 | |
5eb91c98 DG |
3459 | /* |
3460 | * Data is received from the lttng client. The struct | |
3461 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3462 | * the client. | |
3463 | */ | |
3464 | DBG("Receiving data from client ..."); | |
3465 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3466 | sizeof(struct lttcomm_session_msg)); | |
3467 | if (ret <= 0) { | |
3468 | DBG("Nothing recv() from client... continuing"); | |
3469 | close(sock); | |
3470 | free(cmd_ctx); | |
3471 | continue; | |
3472 | } | |
1d4b027a | 3473 | |
5eb91c98 DG |
3474 | // TODO: Validate cmd_ctx including sanity check for |
3475 | // security purpose. | |
f7776ea7 | 3476 | |
f6a9efaa | 3477 | rcu_thread_online(); |
5eb91c98 DG |
3478 | /* |
3479 | * This function dispatch the work to the kernel or userspace tracer | |
3480 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3481 | * informations for the client. The command context struct contains | |
3482 | * everything this function may needs. | |
3483 | */ | |
3484 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3485 | rcu_thread_offline(); |
5eb91c98 | 3486 | if (ret < 0) { |
bbd973c2 | 3487 | /* |
5eb91c98 | 3488 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3489 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3490 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3491 | */ |
bbd973c2 | 3492 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3493 | continue; |
3494 | } | |
d6e4fca4 | 3495 | |
54d01ffb DG |
3496 | DBG("Sending response (size: %d, retcode: %s)", |
3497 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3498 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3499 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3500 | if (ret < 0) { |
3501 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3502 | } |
1d4b027a | 3503 | |
5eb91c98 DG |
3504 | clean_command_ctx(&cmd_ctx); |
3505 | ||
3506 | /* End of transmission */ | |
273ea72c DG |
3507 | close(sock); |
3508 | } | |
3509 | ||
5eb91c98 DG |
3510 | error: |
3511 | DBG("Client thread dying"); | |
273ea72c | 3512 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3513 | close(client_sock); |
3514 | close(sock); | |
273ea72c | 3515 | |
5eb91c98 | 3516 | lttng_poll_clean(&events); |
a2fb29a5 | 3517 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3518 | |
3519 | rcu_unregister_thread(); | |
1d4b027a DG |
3520 | return NULL; |
3521 | } | |
3522 | ||
3523 | ||
fac6795d DG |
3524 | /* |
3525 | * usage function on stderr | |
3526 | */ | |
3527 | static void usage(void) | |
3528 | { | |
b716ce68 | 3529 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3530 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3531 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3532 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3533 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3534 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3535 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3536 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3537 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3538 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
3539 | fprintf(stderr, " --ustconsumerd32 PATH Specify path for the 32-bit UST consumer daemon binary\n"); | |
3540 | fprintf(stderr, " --ustconsumerd64 PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
d6f42150 DG |
3541 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3542 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3543 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3544 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3545 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3546 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3547 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3548 | } |
3549 | ||
3550 | /* | |
3551 | * daemon argument parsing | |
3552 | */ | |
3553 | static int parse_args(int argc, char **argv) | |
3554 | { | |
3555 | int c; | |
3556 | ||
3557 | static struct option long_options[] = { | |
3558 | { "client-sock", 1, 0, 'c' }, | |
3559 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3560 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3561 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3562 | { "ustconsumerd64", 1, 0, 't' }, |
3563 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
3564 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3565 | { "ustconsumerd32", 1, 0, 'u' }, | |
3566 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
3567 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
fac6795d | 3568 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3569 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3570 | { "help", 0, 0, 'h' }, |
3571 | { "group", 1, 0, 'g' }, | |
3572 | { "version", 0, 0, 'V' }, | |
75462a81 | 3573 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3574 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3575 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3576 | { NULL, 0, 0, 0 } |
3577 | }; | |
3578 | ||
3579 | while (1) { | |
3580 | int option_index = 0; | |
7753dea8 | 3581 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3582 | long_options, &option_index); |
fac6795d DG |
3583 | if (c == -1) { |
3584 | break; | |
3585 | } | |
3586 | ||
3587 | switch (c) { | |
3588 | case 0: | |
3589 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3590 | if (optarg) { | |
3591 | fprintf(stderr, " with arg %s\n", optarg); | |
3592 | } | |
3593 | break; | |
b716ce68 | 3594 | case 'c': |
fac6795d DG |
3595 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3596 | break; | |
3597 | case 'a': | |
3598 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3599 | break; | |
3600 | case 'd': | |
3601 | opt_daemon = 1; | |
3602 | break; | |
3603 | case 'g': | |
fb09408a | 3604 | opt_tracing_group = optarg; |
fac6795d DG |
3605 | break; |
3606 | case 'h': | |
3607 | usage(); | |
3608 | exit(EXIT_FAILURE); | |
3609 | case 'V': | |
3610 | fprintf(stdout, "%s\n", VERSION); | |
3611 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3612 | case 'S': |
3613 | opt_sig_parent = 1; | |
3614 | break; | |
d6f42150 | 3615 | case 'E': |
3bd1e081 | 3616 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3617 | break; |
3618 | case 'C': | |
3bd1e081 MD |
3619 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3620 | break; | |
3621 | case 'F': | |
7753dea8 | 3622 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3623 | break; |
3624 | case 'D': | |
7753dea8 MD |
3625 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3626 | break; | |
3627 | case 'H': | |
3628 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3629 | break; | |
3630 | case 'G': | |
3631 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3632 | break; |
75462a81 DG |
3633 | case 'q': |
3634 | opt_quiet = 1; | |
3635 | break; | |
3f9947db | 3636 | case 'v': |
53086306 DG |
3637 | /* Verbose level can increase using multiple -v */ |
3638 | opt_verbose += 1; | |
3f9947db | 3639 | break; |
31f73cc9 | 3640 | case 'Z': |
3bd1e081 | 3641 | opt_verbose_consumer += 1; |
31f73cc9 | 3642 | break; |
fb09408a | 3643 | case 'u': |
7753dea8 MD |
3644 | consumerd32_bindir = optarg; |
3645 | break; | |
3646 | case 't': | |
3647 | consumerd64_bindir = optarg; | |
fb09408a | 3648 | break; |
fac6795d DG |
3649 | default: |
3650 | /* Unknown option or other error. | |
3651 | * Error is printed by getopt, just return */ | |
3652 | return -1; | |
3653 | } | |
3654 | } | |
3655 | ||
3656 | return 0; | |
3657 | } | |
3658 | ||
3659 | /* | |
d063d709 | 3660 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3661 | * apps_sock - The communication socket for all UST apps. |
3662 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3663 | */ |
cf3af59e | 3664 | static int init_daemon_socket(void) |
fac6795d DG |
3665 | { |
3666 | int ret = 0; | |
3667 | mode_t old_umask; | |
3668 | ||
3669 | old_umask = umask(0); | |
3670 | ||
3671 | /* Create client tool unix socket */ | |
d6f42150 DG |
3672 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3673 | if (client_sock < 0) { | |
3674 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3675 | ret = -1; |
3676 | goto end; | |
3677 | } | |
3678 | ||
3679 | /* File permission MUST be 660 */ | |
3680 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3681 | if (ret < 0) { | |
d6f42150 | 3682 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3683 | perror("chmod"); |
3684 | goto end; | |
3685 | } | |
3686 | ||
3687 | /* Create the application unix socket */ | |
d6f42150 DG |
3688 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3689 | if (apps_sock < 0) { | |
3690 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3691 | ret = -1; |
3692 | goto end; | |
3693 | } | |
3694 | ||
d6f42150 | 3695 | /* File permission MUST be 666 */ |
54d01ffb DG |
3696 | ret = chmod(apps_unix_sock_path, |
3697 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3698 | if (ret < 0) { |
d6f42150 | 3699 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3700 | perror("chmod"); |
3701 | goto end; | |
3702 | } | |
3703 | ||
3704 | end: | |
3705 | umask(old_umask); | |
3706 | return ret; | |
3707 | } | |
3708 | ||
3709 | /* | |
54d01ffb DG |
3710 | * Check if the global socket is available, and if a daemon is answering at the |
3711 | * other side. If yes, error is returned. | |
fac6795d | 3712 | */ |
cf3af59e | 3713 | static int check_existing_daemon(void) |
fac6795d | 3714 | { |
7d8234d9 | 3715 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3716 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3717 | return 0; |
099e26bd | 3718 | } |
54d01ffb | 3719 | |
7d8234d9 | 3720 | /* Is there anybody out there ? */ |
099e26bd | 3721 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3722 | return -EEXIST; |
099e26bd | 3723 | } else { |
7d8234d9 | 3724 | return 0; |
099e26bd | 3725 | } |
fac6795d DG |
3726 | } |
3727 | ||
fac6795d | 3728 | /* |
d063d709 | 3729 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3730 | * |
d063d709 DG |
3731 | * Race window between mkdir and chown is OK because we are going from more |
3732 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3733 | */ |
d6f42150 | 3734 | static int set_permissions(void) |
fac6795d DG |
3735 | { |
3736 | int ret; | |
996b65c8 | 3737 | gid_t gid; |
fac6795d | 3738 | |
996b65c8 MD |
3739 | gid = allowed_group(); |
3740 | if (gid < 0) { | |
a463f419 DG |
3741 | if (is_root) { |
3742 | WARN("No tracing group detected"); | |
3743 | ret = 0; | |
3744 | } else { | |
3745 | ERR("Missing tracing group. Aborting execution."); | |
3746 | ret = -1; | |
3747 | } | |
fac6795d DG |
3748 | goto end; |
3749 | } | |
3750 | ||
d6f42150 | 3751 | /* Set lttng run dir */ |
996b65c8 | 3752 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3753 | if (ret < 0) { |
3754 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3755 | perror("chown"); | |
3756 | } | |
3757 | ||
3758 | /* lttng client socket path */ | |
996b65c8 | 3759 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3760 | if (ret < 0) { |
d6f42150 DG |
3761 | ERR("Unable to set group on %s", client_unix_sock_path); |
3762 | perror("chown"); | |
3763 | } | |
3764 | ||
3bd1e081 MD |
3765 | /* kconsumer error socket path */ |
3766 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3767 | if (ret < 0) { |
3bd1e081 MD |
3768 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3769 | perror("chown"); | |
3770 | } | |
3771 | ||
7753dea8 MD |
3772 | /* 64-bit ustconsumer error socket path */ |
3773 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3774 | if (ret < 0) { | |
3775 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
3776 | perror("chown"); | |
3777 | } | |
3778 | ||
3779 | /* 32-bit ustconsumer compat32 error socket path */ | |
3780 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3781 | if (ret < 0) { |
7753dea8 | 3782 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
3783 | perror("chown"); |
3784 | } | |
3785 | ||
d6f42150 | 3786 | DBG("All permissions are set"); |
e07ae692 | 3787 | |
fac6795d DG |
3788 | end: |
3789 | return ret; | |
3790 | } | |
3791 | ||
7a485870 | 3792 | /* |
d063d709 | 3793 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3794 | */ |
3795 | static int create_kernel_poll_pipe(void) | |
3796 | { | |
3797 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3798 | } | |
3799 | ||
099e26bd DG |
3800 | /* |
3801 | * Create the application command pipe to wake thread_manage_apps. | |
3802 | */ | |
3803 | static int create_apps_cmd_pipe(void) | |
3804 | { | |
3805 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3806 | } | |
3807 | ||
d6f42150 | 3808 | /* |
d063d709 | 3809 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3810 | */ |
3811 | static int create_lttng_rundir(void) | |
3812 | { | |
3813 | int ret; | |
3814 | ||
3815 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3816 | if (ret < 0) { | |
b1f11e69 DG |
3817 | if (errno != EEXIST) { |
3818 | ERR("Unable to create " LTTNG_RUNDIR); | |
3819 | goto error; | |
3820 | } else { | |
3821 | ret = 0; | |
3822 | } | |
d6f42150 DG |
3823 | } |
3824 | ||
3825 | error: | |
3826 | return ret; | |
3827 | } | |
3828 | ||
3829 | /* | |
d063d709 DG |
3830 | * Setup sockets and directory needed by the kconsumerd communication with the |
3831 | * session daemon. | |
d6f42150 | 3832 | */ |
3bd1e081 | 3833 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3834 | { |
3835 | int ret; | |
7753dea8 | 3836 | const char *path; |
d6f42150 | 3837 | |
7753dea8 MD |
3838 | switch (consumer_data->type) { |
3839 | case LTTNG_CONSUMER_KERNEL: | |
3840 | path = KCONSUMERD_PATH; | |
3841 | break; | |
3842 | case LTTNG_CONSUMER64_UST: | |
3843 | path = USTCONSUMERD64_PATH; | |
3844 | break; | |
3845 | case LTTNG_CONSUMER32_UST: | |
3846 | path = USTCONSUMERD32_PATH; | |
3847 | break; | |
3848 | default: | |
3849 | ERR("Consumer type unknown"); | |
3850 | ret = -EINVAL; | |
3851 | goto error; | |
d6f42150 DG |
3852 | } |
3853 | ||
3bd1e081 | 3854 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3855 | if (ret < 0) { |
6beb2242 | 3856 | if (errno != EEXIST) { |
3bd1e081 | 3857 | ERR("Failed to create %s", path); |
6beb2242 DG |
3858 | goto error; |
3859 | } | |
3860 | ret = 0; | |
d6f42150 DG |
3861 | } |
3862 | ||
3863 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3864 | consumer_data->err_sock = |
3865 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3866 | if (consumer_data->err_sock < 0) { | |
3867 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3868 | ret = -1; |
3869 | goto error; | |
3870 | } | |
3871 | ||
3872 | /* File permission MUST be 660 */ | |
3bd1e081 | 3873 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3874 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3875 | if (ret < 0) { |
3bd1e081 | 3876 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3877 | perror("chmod"); |
3878 | goto error; | |
3879 | } | |
3880 | ||
3881 | error: | |
3882 | return ret; | |
3883 | } | |
3884 | ||
fac6795d | 3885 | /* |
d063d709 | 3886 | * Signal handler for the daemon |
cf3af59e | 3887 | * |
54d01ffb DG |
3888 | * Simply stop all worker threads, leaving main() return gracefully after |
3889 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3890 | */ |
3891 | static void sighandler(int sig) | |
3892 | { | |
3893 | switch (sig) { | |
cf3af59e MD |
3894 | case SIGPIPE: |
3895 | DBG("SIGPIPE catched"); | |
3896 | return; | |
3897 | case SIGINT: | |
3898 | DBG("SIGINT catched"); | |
3899 | stop_threads(); | |
3900 | break; | |
3901 | case SIGTERM: | |
3902 | DBG("SIGTERM catched"); | |
3903 | stop_threads(); | |
3904 | break; | |
3905 | default: | |
3906 | break; | |
fac6795d | 3907 | } |
fac6795d DG |
3908 | } |
3909 | ||
3910 | /* | |
d063d709 | 3911 | * Setup signal handler for : |
1d4b027a | 3912 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3913 | */ |
1d4b027a | 3914 | static int set_signal_handler(void) |
fac6795d | 3915 | { |
1d4b027a DG |
3916 | int ret = 0; |
3917 | struct sigaction sa; | |
3918 | sigset_t sigset; | |
fac6795d | 3919 | |
1d4b027a DG |
3920 | if ((ret = sigemptyset(&sigset)) < 0) { |
3921 | perror("sigemptyset"); | |
3922 | return ret; | |
3923 | } | |
d6f42150 | 3924 | |
1d4b027a DG |
3925 | sa.sa_handler = sighandler; |
3926 | sa.sa_mask = sigset; | |
3927 | sa.sa_flags = 0; | |
3928 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3929 | perror("sigaction"); | |
3930 | return ret; | |
d6f42150 DG |
3931 | } |
3932 | ||
1d4b027a DG |
3933 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3934 | perror("sigaction"); | |
3935 | return ret; | |
d6f42150 | 3936 | } |
aaf26714 | 3937 | |
1d4b027a DG |
3938 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3939 | perror("sigaction"); | |
3940 | return ret; | |
8c0faa1d DG |
3941 | } |
3942 | ||
1d4b027a DG |
3943 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3944 | ||
3945 | return ret; | |
fac6795d DG |
3946 | } |
3947 | ||
f3ed775e | 3948 | /* |
d063d709 DG |
3949 | * Set open files limit to unlimited. This daemon can open a large number of |
3950 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3951 | */ |
3952 | static void set_ulimit(void) | |
3953 | { | |
3954 | int ret; | |
3955 | struct rlimit lim; | |
3956 | ||
a88df331 | 3957 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3958 | lim.rlim_cur = 65535; |
3959 | lim.rlim_max = 65535; | |
3960 | ||
3961 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3962 | if (ret < 0) { | |
3963 | perror("failed to set open files limit"); | |
3964 | } | |
3965 | } | |
3966 | ||
fac6795d DG |
3967 | /* |
3968 | * main | |
3969 | */ | |
3970 | int main(int argc, char **argv) | |
3971 | { | |
fac6795d DG |
3972 | int ret = 0; |
3973 | void *status; | |
b082db07 | 3974 | const char *home_path; |
fac6795d | 3975 | |
f6a9efaa DG |
3976 | rcu_register_thread(); |
3977 | ||
273ea72c | 3978 | /* Create thread quit pipe */ |
cf3af59e MD |
3979 | if ((ret = init_thread_quit_pipe()) < 0) { |
3980 | goto error; | |
273ea72c DG |
3981 | } |
3982 | ||
7753dea8 | 3983 | setup_consumerd_path(); |
fb09408a | 3984 | |
fac6795d DG |
3985 | /* Parse arguments */ |
3986 | progname = argv[0]; | |
3987 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3988 | goto error; |
fac6795d DG |
3989 | } |
3990 | ||
3991 | /* Daemonize */ | |
3992 | if (opt_daemon) { | |
53094c05 DG |
3993 | ret = daemon(0, 0); |
3994 | if (ret < 0) { | |
3995 | perror("daemon"); | |
cf3af59e | 3996 | goto error; |
53094c05 | 3997 | } |
fac6795d DG |
3998 | } |
3999 | ||
4000 | /* Check if daemon is UID = 0 */ | |
4001 | is_root = !getuid(); | |
4002 | ||
fac6795d | 4003 | if (is_root) { |
d6f42150 DG |
4004 | ret = create_lttng_rundir(); |
4005 | if (ret < 0) { | |
cf3af59e | 4006 | goto error; |
d6f42150 DG |
4007 | } |
4008 | ||
fac6795d | 4009 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4010 | snprintf(apps_unix_sock_path, PATH_MAX, |
4011 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4012 | } |
4013 | ||
4014 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4015 | snprintf(client_unix_sock_path, PATH_MAX, |
4016 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4017 | } | |
0fdd1e2c DG |
4018 | |
4019 | /* Set global SHM for ust */ | |
4020 | if (strlen(wait_shm_path) == 0) { | |
4021 | snprintf(wait_shm_path, PATH_MAX, | |
4022 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4023 | } | |
fac6795d | 4024 | } else { |
b082db07 DG |
4025 | home_path = get_home_dir(); |
4026 | if (home_path == NULL) { | |
273ea72c DG |
4027 | /* TODO: Add --socket PATH option */ |
4028 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4029 | ret = -EPERM; |
4030 | goto error; | |
b082db07 DG |
4031 | } |
4032 | ||
fac6795d | 4033 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4034 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4035 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4036 | } |
4037 | ||
4038 | /* Set the cli tool unix socket path */ | |
4039 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4040 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4041 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4042 | } |
0fdd1e2c DG |
4043 | |
4044 | /* Set global SHM for ust */ | |
4045 | if (strlen(wait_shm_path) == 0) { | |
4046 | snprintf(wait_shm_path, PATH_MAX, | |
4047 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4048 | } | |
fac6795d DG |
4049 | } |
4050 | ||
847177cd DG |
4051 | DBG("Client socket path %s", client_unix_sock_path); |
4052 | DBG("Application socket path %s", apps_unix_sock_path); | |
4053 | ||
273ea72c | 4054 | /* |
7d8234d9 | 4055 | * See if daemon already exist. |
fac6795d | 4056 | */ |
7d8234d9 | 4057 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4058 | ERR("Already running daemon.\n"); |
273ea72c | 4059 | /* |
cf3af59e MD |
4060 | * We do not goto exit because we must not cleanup() |
4061 | * because a daemon is already running. | |
ab118b20 | 4062 | */ |
cf3af59e | 4063 | goto error; |
a88df331 DG |
4064 | } |
4065 | ||
54d01ffb | 4066 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4067 | |
4068 | /* | |
4069 | * These actions must be executed as root. We do that *after* setting up | |
4070 | * the sockets path because we MUST make the check for another daemon using | |
4071 | * those paths *before* trying to set the kernel consumer sockets and init | |
4072 | * kernel tracer. | |
4073 | */ | |
4074 | if (is_root) { | |
3bd1e081 MD |
4075 | ret = set_consumer_sockets(&kconsumer_data); |
4076 | if (ret < 0) { | |
4077 | goto exit; | |
4078 | } | |
48842b30 | 4079 | |
7753dea8 | 4080 | ret = set_consumer_sockets(&ustconsumer64_data); |
a88df331 | 4081 | if (ret < 0) { |
cf3af59e | 4082 | goto exit; |
a88df331 | 4083 | } |
7753dea8 MD |
4084 | |
4085 | ret = set_consumer_sockets(&ustconsumer32_data); | |
4086 | if (ret < 0) { | |
4087 | goto exit; | |
4088 | } | |
4089 | ||
a88df331 DG |
4090 | /* Setup kernel tracer */ |
4091 | init_kernel_tracer(); | |
4092 | ||
4093 | /* Set ulimit for open files */ | |
4094 | set_ulimit(); | |
fac6795d DG |
4095 | } |
4096 | ||
cf3af59e MD |
4097 | if ((ret = set_signal_handler()) < 0) { |
4098 | goto exit; | |
fac6795d DG |
4099 | } |
4100 | ||
d6f42150 | 4101 | /* Setup the needed unix socket */ |
cf3af59e MD |
4102 | if ((ret = init_daemon_socket()) < 0) { |
4103 | goto exit; | |
fac6795d DG |
4104 | } |
4105 | ||
4106 | /* Set credentials to socket */ | |
cf3af59e MD |
4107 | if (is_root && ((ret = set_permissions()) < 0)) { |
4108 | goto exit; | |
fac6795d DG |
4109 | } |
4110 | ||
5b8719f5 DG |
4111 | /* Get parent pid if -S, --sig-parent is specified. */ |
4112 | if (opt_sig_parent) { | |
4113 | ppid = getppid(); | |
4114 | } | |
4115 | ||
7a485870 | 4116 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4117 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4118 | goto exit; | |
7a485870 DG |
4119 | } |
4120 | ||
099e26bd DG |
4121 | /* Setup the thread apps communication pipe. */ |
4122 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4123 | goto exit; | |
4124 | } | |
4125 | ||
4126 | /* Init UST command queue. */ | |
4127 | cds_wfq_init(&ust_cmd_queue.queue); | |
4128 | ||
f6a9efaa DG |
4129 | /* Init UST app hash table */ |
4130 | ust_app_ht_alloc(); | |
4131 | ||
273ea72c | 4132 | /* |
54d01ffb DG |
4133 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4134 | * statically declared in session.c | |
273ea72c | 4135 | */ |
54d01ffb | 4136 | session_list_ptr = session_get_list(); |
b5541356 | 4137 | |
5eb91c98 DG |
4138 | /* Set up max poll set size */ |
4139 | lttng_poll_set_max_size(); | |
4140 | ||
cf3af59e | 4141 | /* Create thread to manage the client socket */ |
099e26bd DG |
4142 | ret = pthread_create(&client_thread, NULL, |
4143 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4144 | if (ret != 0) { |
099e26bd | 4145 | perror("pthread_create clients"); |
cf3af59e MD |
4146 | goto exit_client; |
4147 | } | |
fac6795d | 4148 | |
099e26bd DG |
4149 | /* Create thread to dispatch registration */ |
4150 | ret = pthread_create(&dispatch_thread, NULL, | |
4151 | thread_dispatch_ust_registration, (void *) NULL); | |
4152 | if (ret != 0) { | |
4153 | perror("pthread_create dispatch"); | |
4154 | goto exit_dispatch; | |
4155 | } | |
4156 | ||
4157 | /* Create thread to manage application registration. */ | |
4158 | ret = pthread_create(®_apps_thread, NULL, | |
4159 | thread_registration_apps, (void *) NULL); | |
4160 | if (ret != 0) { | |
4161 | perror("pthread_create registration"); | |
4162 | goto exit_reg_apps; | |
4163 | } | |
4164 | ||
cf3af59e | 4165 | /* Create thread to manage application socket */ |
54d01ffb DG |
4166 | ret = pthread_create(&apps_thread, NULL, |
4167 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4168 | if (ret != 0) { |
099e26bd | 4169 | perror("pthread_create apps"); |
cf3af59e MD |
4170 | goto exit_apps; |
4171 | } | |
fac6795d | 4172 | |
cf3af59e | 4173 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4174 | ret = pthread_create(&kernel_thread, NULL, |
4175 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4176 | if (ret != 0) { |
099e26bd | 4177 | perror("pthread_create kernel"); |
cf3af59e MD |
4178 | goto exit_kernel; |
4179 | } | |
7a485870 | 4180 | |
cf3af59e MD |
4181 | ret = pthread_join(kernel_thread, &status); |
4182 | if (ret != 0) { | |
4183 | perror("pthread_join"); | |
4184 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4185 | } |
4186 | ||
cf3af59e MD |
4187 | exit_kernel: |
4188 | ret = pthread_join(apps_thread, &status); | |
4189 | if (ret != 0) { | |
4190 | perror("pthread_join"); | |
4191 | goto error; /* join error, exit without cleanup */ | |
4192 | } | |
fac6795d | 4193 | |
cf3af59e | 4194 | exit_apps: |
099e26bd DG |
4195 | ret = pthread_join(reg_apps_thread, &status); |
4196 | if (ret != 0) { | |
4197 | perror("pthread_join"); | |
4198 | goto error; /* join error, exit without cleanup */ | |
4199 | } | |
4200 | ||
4201 | exit_reg_apps: | |
4202 | ret = pthread_join(dispatch_thread, &status); | |
4203 | if (ret != 0) { | |
4204 | perror("pthread_join"); | |
4205 | goto error; /* join error, exit without cleanup */ | |
4206 | } | |
4207 | ||
4208 | exit_dispatch: | |
cf3af59e MD |
4209 | ret = pthread_join(client_thread, &status); |
4210 | if (ret != 0) { | |
4211 | perror("pthread_join"); | |
4212 | goto error; /* join error, exit without cleanup */ | |
4213 | } | |
4214 | ||
3bd1e081 | 4215 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4216 | if (ret != 0) { |
3bd1e081 | 4217 | perror("join_consumer"); |
cf3af59e MD |
4218 | goto error; /* join error, exit without cleanup */ |
4219 | } | |
a88df331 | 4220 | |
cf3af59e | 4221 | exit_client: |
a88df331 | 4222 | exit: |
cf3af59e MD |
4223 | /* |
4224 | * cleanup() is called when no other thread is running. | |
4225 | */ | |
f6a9efaa | 4226 | rcu_thread_online(); |
cf3af59e | 4227 | cleanup(); |
f6a9efaa DG |
4228 | rcu_thread_offline(); |
4229 | rcu_unregister_thread(); | |
cf3af59e MD |
4230 | if (!ret) |
4231 | exit(EXIT_SUCCESS); | |
4232 | error: | |
5e16da05 | 4233 | exit(EXIT_FAILURE); |
fac6795d | 4234 | } |