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 | { |
8f7a84dd DG |
338 | if (!session->kernel_session) { |
339 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 340 | return; |
8f7a84dd DG |
341 | } |
342 | ||
84ea9c99 | 343 | DBG("Tearing down kernel session"); |
d9800920 | 344 | |
84ea9c99 MD |
345 | /* |
346 | * If a custom kernel consumer was registered, close the socket before | |
347 | * tearing down the complete kernel session structure | |
348 | */ | |
349 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
350 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 351 | } |
84ea9c99 MD |
352 | |
353 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
354 | } |
355 | ||
f6a9efaa DG |
356 | /* |
357 | * Complete teardown of all UST sessions. This will free everything on his path | |
358 | * and destroy the core essence of all ust sessions :) | |
359 | */ | |
360 | static void teardown_ust_session(struct ltt_session *session) | |
361 | { | |
84cd17c6 MD |
362 | int ret; |
363 | ||
8f7a84dd DG |
364 | if (!session->ust_session) { |
365 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 366 | return; |
8f7a84dd DG |
367 | } |
368 | ||
84ea9c99 | 369 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 370 | |
84cd17c6 MD |
371 | ret = ust_app_destroy_trace_all(session->ust_session); |
372 | if (ret) { | |
373 | ERR("Error in ust_app_destroy_trace_all"); | |
374 | } | |
8f7a84dd | 375 | |
f6a9efaa DG |
376 | trace_ust_destroy_session(session->ust_session); |
377 | } | |
378 | ||
099e26bd DG |
379 | /* |
380 | * Stop all threads by closing the thread quit pipe. | |
381 | */ | |
cf3af59e MD |
382 | static void stop_threads(void) |
383 | { | |
5eb91c98 DG |
384 | int ret; |
385 | ||
cf3af59e MD |
386 | /* Stopping all threads */ |
387 | DBG("Terminating all threads"); | |
54d01ffb | 388 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
389 | if (ret < 0) { |
390 | ERR("write error on thread quit pipe"); | |
391 | } | |
392 | ||
099e26bd DG |
393 | /* Dispatch thread */ |
394 | dispatch_thread_exit = 1; | |
395 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
396 | } |
397 | ||
fac6795d | 398 | /* |
d063d709 | 399 | * Cleanup the daemon |
fac6795d | 400 | */ |
cf3af59e | 401 | static void cleanup(void) |
fac6795d | 402 | { |
1d4b027a DG |
403 | int ret; |
404 | char *cmd; | |
af9737e9 | 405 | struct ltt_session *sess, *stmp; |
fac6795d | 406 | |
1d4b027a | 407 | DBG("Cleaning up"); |
e07ae692 | 408 | |
5eb91c98 DG |
409 | if (is_root) { |
410 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
411 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
412 | if (ret < 0) { | |
413 | ERR("asprintf failed. Something is really wrong!"); | |
414 | } | |
5461b305 | 415 | |
5eb91c98 DG |
416 | /* Remove lttng run directory */ |
417 | ret = system(cmd); | |
418 | if (ret < 0) { | |
419 | ERR("Unable to clean " LTTNG_RUNDIR); | |
420 | } | |
1d4b027a | 421 | } |
5461b305 | 422 | |
1d4b027a | 423 | DBG("Cleaning up all session"); |
fac6795d | 424 | |
b5541356 | 425 | /* Destroy session list mutex */ |
273ea72c DG |
426 | if (session_list_ptr != NULL) { |
427 | pthread_mutex_destroy(&session_list_ptr->lock); | |
428 | ||
429 | /* Cleanup ALL session */ | |
54d01ffb DG |
430 | cds_list_for_each_entry_safe(sess, stmp, |
431 | &session_list_ptr->head, list) { | |
273ea72c | 432 | teardown_kernel_session(sess); |
f6a9efaa DG |
433 | teardown_ust_session(sess); |
434 | free(sess); | |
273ea72c DG |
435 | } |
436 | } | |
437 | ||
099e26bd | 438 | DBG("Closing all UST sockets"); |
56fff090 | 439 | ust_app_clean_list(); |
099e26bd | 440 | |
3bd1e081 | 441 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 442 | |
f3ed775e | 443 | DBG("Closing kernel fd"); |
1d4b027a | 444 | close(kernel_tracer_fd); |
ab147185 | 445 | |
2f50c8a3 DG |
446 | if (is_root) { |
447 | DBG("Unloading kernel modules"); | |
448 | modprobe_remove_kernel_modules(); | |
449 | } | |
5eb91c98 DG |
450 | |
451 | close(thread_quit_pipe[0]); | |
452 | close(thread_quit_pipe[1]); | |
421cb601 DG |
453 | |
454 | /* <fun> */ | |
455 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
456 | "Matthew, BEET driven development works!%c[%dm", | |
457 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
458 | /* </fun> */ | |
fac6795d DG |
459 | } |
460 | ||
e065084a | 461 | /* |
d063d709 | 462 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 463 | * |
d063d709 | 464 | * Return lttcomm error code. |
e065084a DG |
465 | */ |
466 | static int send_unix_sock(int sock, void *buf, size_t len) | |
467 | { | |
468 | /* Check valid length */ | |
469 | if (len <= 0) { | |
470 | return -1; | |
471 | } | |
472 | ||
473 | return lttcomm_send_unix_sock(sock, buf, len); | |
474 | } | |
475 | ||
5461b305 | 476 | /* |
d063d709 | 477 | * Free memory of a command context structure. |
5461b305 | 478 | */ |
a2fb29a5 | 479 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 480 | { |
a2fb29a5 DG |
481 | DBG("Clean command context structure"); |
482 | if (*cmd_ctx) { | |
483 | if ((*cmd_ctx)->llm) { | |
484 | free((*cmd_ctx)->llm); | |
5461b305 | 485 | } |
a2fb29a5 DG |
486 | if ((*cmd_ctx)->lsm) { |
487 | free((*cmd_ctx)->lsm); | |
5461b305 | 488 | } |
a2fb29a5 DG |
489 | free(*cmd_ctx); |
490 | *cmd_ctx = NULL; | |
5461b305 DG |
491 | } |
492 | } | |
493 | ||
f3ed775e | 494 | /* |
d063d709 | 495 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 496 | */ |
2bdd86d4 | 497 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 498 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
499 | { |
500 | int ret; | |
f3ed775e | 501 | struct ltt_kernel_stream *stream; |
3bd1e081 | 502 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 503 | |
3bd1e081 | 504 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 505 | channel->channel->name); |
f3ed775e | 506 | |
3bd1e081 MD |
507 | /* Send channel */ |
508 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
509 | lkm.u.channel.channel_key = channel->fd; | |
510 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
511 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 512 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 513 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 514 | if (ret < 0) { |
3bd1e081 | 515 | perror("send consumer channel"); |
f3ed775e DG |
516 | goto error; |
517 | } | |
518 | ||
3bd1e081 | 519 | /* Send streams */ |
7a485870 | 520 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
521 | if (!stream->fd) { |
522 | continue; | |
523 | } | |
524 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
525 | lkm.u.stream.channel_key = channel->fd; | |
526 | lkm.u.stream.stream_key = stream->fd; | |
527 | lkm.u.stream.state = stream->state; | |
528 | lkm.u.stream.output = channel->channel->attr.output; | |
529 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
530 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
531 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
532 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
533 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
534 | if (ret < 0) { | |
535 | perror("send consumer stream"); | |
536 | goto error; | |
537 | } | |
538 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
539 | if (ret < 0) { | |
540 | perror("send consumer stream ancillary data"); | |
541 | goto error; | |
f3ed775e DG |
542 | } |
543 | } | |
544 | ||
3bd1e081 | 545 | DBG("consumer channel streams sent"); |
f3ed775e DG |
546 | |
547 | return 0; | |
548 | ||
549 | error: | |
550 | return ret; | |
551 | } | |
552 | ||
553 | /* | |
d063d709 | 554 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 555 | */ |
2bdd86d4 | 556 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 557 | struct ltt_kernel_session *session) |
f3ed775e DG |
558 | { |
559 | int ret; | |
560 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
561 | struct lttcomm_consumer_msg lkm; |
562 | int sock = session->consumer_fd; | |
7a485870 DG |
563 | |
564 | DBG("Sending metadata stream fd"); | |
565 | ||
2bdd86d4 | 566 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 567 | if (session->consumer_fd == 0) { |
3bd1e081 | 568 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
569 | } |
570 | ||
7a485870 | 571 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
572 | /* Send metadata channel fd */ |
573 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
574 | lkm.u.channel.channel_key = session->metadata->fd; | |
575 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
576 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
577 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
578 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
579 | if (ret < 0) { | |
580 | perror("send consumer channel"); | |
581 | goto error; | |
582 | } | |
583 | ||
584 | /* Send metadata stream fd */ | |
585 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
586 | lkm.u.stream.channel_key = session->metadata->fd; | |
587 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
588 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
589 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
590 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
591 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
592 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
593 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
594 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
595 | if (ret < 0) { | |
596 | perror("send consumer stream"); | |
597 | goto error; | |
598 | } | |
599 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 600 | if (ret < 0) { |
3bd1e081 | 601 | perror("send consumer stream"); |
7a485870 DG |
602 | goto error; |
603 | } | |
604 | } | |
f3ed775e | 605 | |
f3ed775e | 606 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
607 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
608 | if (ret < 0) { | |
609 | goto error; | |
610 | } | |
611 | } | |
612 | ||
613 | DBG("consumer fds (metadata and channel streams) sent"); | |
614 | ||
615 | return 0; | |
616 | ||
617 | error: | |
618 | return ret; | |
619 | } | |
620 | ||
fac6795d | 621 | /* |
0fdd1e2c | 622 | * Notify UST applications using the shm mmap futex. |
fac6795d | 623 | */ |
0fdd1e2c | 624 | static int notify_ust_apps(int active) |
fac6795d | 625 | { |
0fdd1e2c | 626 | char *wait_shm_mmap; |
fac6795d | 627 | |
0fdd1e2c | 628 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 629 | |
0fdd1e2c DG |
630 | /* See shm.c for this call implying mmap, shm and futex calls */ |
631 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
632 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
633 | goto error; |
634 | } | |
635 | ||
0fdd1e2c DG |
636 | /* Wake waiting process */ |
637 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
638 | ||
639 | /* Apps notified successfully */ | |
640 | return 0; | |
fac6795d DG |
641 | |
642 | error: | |
0fdd1e2c | 643 | return -1; |
fac6795d DG |
644 | } |
645 | ||
e065084a | 646 | /* |
d063d709 DG |
647 | * Setup the outgoing data buffer for the response (llm) by allocating the |
648 | * right amount of memory and copying the original information from the lsm | |
649 | * structure. | |
ca95a216 | 650 | * |
d063d709 | 651 | * Return total size of the buffer pointed by buf. |
ca95a216 | 652 | */ |
5461b305 | 653 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 654 | { |
f3ed775e | 655 | int ret, buf_size; |
ca95a216 | 656 | |
f3ed775e | 657 | buf_size = size; |
5461b305 | 658 | |
ba7f0ae5 | 659 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 660 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 661 | perror("zmalloc"); |
5461b305 | 662 | ret = -ENOMEM; |
ca95a216 DG |
663 | goto error; |
664 | } | |
665 | ||
5461b305 DG |
666 | /* Copy common data */ |
667 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 668 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 669 | |
5461b305 DG |
670 | cmd_ctx->llm->data_size = size; |
671 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
672 | ||
ca95a216 DG |
673 | return buf_size; |
674 | ||
675 | error: | |
676 | return ret; | |
677 | } | |
678 | ||
7a485870 | 679 | /* |
5eb91c98 | 680 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 681 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 682 | */ |
5eb91c98 | 683 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 684 | { |
5eb91c98 | 685 | int ret; |
7a485870 DG |
686 | struct ltt_session *session; |
687 | struct ltt_kernel_channel *channel; | |
688 | ||
5eb91c98 | 689 | DBG("Updating kernel poll set"); |
7a485870 | 690 | |
54d01ffb | 691 | session_lock_list(); |
b5541356 | 692 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 693 | session_lock(session); |
7a485870 | 694 | if (session->kernel_session == NULL) { |
54d01ffb | 695 | session_unlock(session); |
7a485870 DG |
696 | continue; |
697 | } | |
7a485870 | 698 | |
54d01ffb DG |
699 | cds_list_for_each_entry(channel, |
700 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
701 | /* Add channel fd to the kernel poll set */ |
702 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
703 | if (ret < 0) { | |
54d01ffb | 704 | session_unlock(session); |
5eb91c98 DG |
705 | goto error; |
706 | } | |
707 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 708 | } |
54d01ffb | 709 | session_unlock(session); |
7a485870 | 710 | } |
54d01ffb | 711 | session_unlock_list(); |
7a485870 | 712 | |
5eb91c98 | 713 | return 0; |
7a485870 DG |
714 | |
715 | error: | |
54d01ffb | 716 | session_unlock_list(); |
7a485870 DG |
717 | return -1; |
718 | } | |
719 | ||
720 | /* | |
54d01ffb | 721 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 722 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 723 | * |
d063d709 | 724 | * Useful for CPU hotplug feature. |
7a485870 | 725 | */ |
2bdd86d4 | 726 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
727 | { |
728 | int ret = 0; | |
729 | struct ltt_session *session; | |
730 | struct ltt_kernel_channel *channel; | |
731 | ||
732 | DBG("Updating kernel streams for channel fd %d", fd); | |
733 | ||
54d01ffb | 734 | session_lock_list(); |
b5541356 | 735 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 736 | session_lock(session); |
7a485870 | 737 | if (session->kernel_session == NULL) { |
54d01ffb | 738 | session_unlock(session); |
7a485870 DG |
739 | continue; |
740 | } | |
d9800920 DG |
741 | |
742 | /* This is not suppose to be 0 but this is an extra security check */ | |
743 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 744 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
745 | } |
746 | ||
5eb91c98 DG |
747 | cds_list_for_each_entry(channel, |
748 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
749 | if (channel->fd == fd) { |
750 | DBG("Channel found, updating kernel streams"); | |
751 | ret = kernel_open_channel_stream(channel); | |
752 | if (ret < 0) { | |
b3c750d2 | 753 | goto error; |
7a485870 | 754 | } |
d9800920 | 755 | |
7a485870 | 756 | /* |
5eb91c98 DG |
757 | * Have we already sent fds to the consumer? If yes, it means |
758 | * that tracing is started so it is safe to send our updated | |
759 | * stream fds. | |
7a485870 | 760 | */ |
3bd1e081 | 761 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 762 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 763 | session->kernel_session->consumer_fd, channel); |
7a485870 | 764 | if (ret < 0) { |
b3c750d2 | 765 | goto error; |
7a485870 DG |
766 | } |
767 | } | |
b3c750d2 | 768 | goto error; |
7a485870 DG |
769 | } |
770 | } | |
54d01ffb | 771 | session_unlock(session); |
7a485870 | 772 | } |
54d01ffb | 773 | session_unlock_list(); |
b3c750d2 | 774 | return ret; |
7a485870 | 775 | |
b3c750d2 | 776 | error: |
54d01ffb DG |
777 | session_unlock(session); |
778 | session_unlock_list(); | |
7a485870 DG |
779 | return ret; |
780 | } | |
781 | ||
487cf67c DG |
782 | /* |
783 | * For each tracing session, update newly registered apps. | |
784 | */ | |
785 | static void update_ust_app(int app_sock) | |
786 | { | |
787 | struct ltt_session *sess, *stmp; | |
788 | ||
789 | /* For all tracing session(s) */ | |
790 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
791 | if (sess->ust_session) { |
792 | ust_app_global_update(sess->ust_session, app_sock); | |
793 | } | |
487cf67c DG |
794 | } |
795 | } | |
796 | ||
7a485870 | 797 | /* |
d063d709 | 798 | * This thread manage event coming from the kernel. |
7a485870 | 799 | * |
d063d709 DG |
800 | * Features supported in this thread: |
801 | * -) CPU Hotplug | |
7a485870 DG |
802 | */ |
803 | static void *thread_manage_kernel(void *data) | |
804 | { | |
5eb91c98 DG |
805 | int ret, i, pollfd, update_poll_flag = 1; |
806 | uint32_t revents, nb_fd; | |
7a485870 | 807 | char tmp; |
5eb91c98 | 808 | struct lttng_poll_event events; |
7a485870 DG |
809 | |
810 | DBG("Thread manage kernel started"); | |
811 | ||
5eb91c98 DG |
812 | ret = create_thread_poll_set(&events, 2); |
813 | if (ret < 0) { | |
814 | goto error; | |
815 | } | |
816 | ||
817 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
818 | if (ret < 0) { | |
819 | goto error; | |
820 | } | |
821 | ||
7a485870 DG |
822 | while (1) { |
823 | if (update_poll_flag == 1) { | |
5f822d0a DG |
824 | /* |
825 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
826 | * quit pipe and the kernel pipe. | |
827 | */ | |
828 | events.nb_fd = 2; | |
829 | ||
5eb91c98 DG |
830 | ret = update_kernel_poll(&events); |
831 | if (ret < 0) { | |
7a485870 DG |
832 | goto error; |
833 | } | |
834 | update_poll_flag = 0; | |
835 | } | |
836 | ||
5eb91c98 DG |
837 | nb_fd = LTTNG_POLL_GETNB(&events); |
838 | ||
839 | DBG("Thread kernel polling on %d fds", nb_fd); | |
840 | ||
841 | /* Zeroed the poll events */ | |
842 | lttng_poll_reset(&events); | |
7a485870 DG |
843 | |
844 | /* Poll infinite value of time */ | |
5eb91c98 | 845 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 846 | if (ret < 0) { |
7a485870 DG |
847 | goto error; |
848 | } else if (ret == 0) { | |
849 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
850 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
851 | "This should not have happened! Continuing..."); | |
7a485870 DG |
852 | continue; |
853 | } | |
854 | ||
5eb91c98 DG |
855 | for (i = 0; i < nb_fd; i++) { |
856 | /* Fetch once the poll data */ | |
857 | revents = LTTNG_POLL_GETEV(&events, i); | |
858 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 859 | |
5eb91c98 DG |
860 | /* Thread quit pipe has been closed. Killing thread. */ |
861 | ret = check_thread_quit_pipe(pollfd, revents); | |
862 | if (ret) { | |
863 | goto error; | |
864 | } | |
7a485870 | 865 | |
5eb91c98 DG |
866 | /* Check for data on kernel pipe */ |
867 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
868 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
869 | update_poll_flag = 1; | |
870 | continue; | |
871 | } else { | |
872 | /* | |
873 | * New CPU detected by the kernel. Adding kernel stream to | |
874 | * kernel session and updating the kernel consumer | |
875 | */ | |
876 | if (revents & LPOLLIN) { | |
2bdd86d4 | 877 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
878 | if (ret < 0) { |
879 | continue; | |
880 | } | |
881 | break; | |
882 | /* | |
883 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
884 | * and unregister kernel stream at this point. | |
885 | */ | |
7a485870 | 886 | } |
7a485870 DG |
887 | } |
888 | } | |
889 | } | |
890 | ||
891 | error: | |
892 | DBG("Kernel thread dying"); | |
273ea72c DG |
893 | close(kernel_poll_pipe[0]); |
894 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
895 | |
896 | lttng_poll_clean(&events); | |
897 | ||
7a485870 DG |
898 | return NULL; |
899 | } | |
900 | ||
1d4b027a | 901 | /* |
3bd1e081 | 902 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 903 | */ |
3bd1e081 | 904 | static void *thread_manage_consumer(void *data) |
1d4b027a | 905 | { |
5eb91c98 DG |
906 | int sock = 0, i, ret, pollfd; |
907 | uint32_t revents, nb_fd; | |
1d4b027a | 908 | enum lttcomm_return_code code; |
5eb91c98 | 909 | struct lttng_poll_event events; |
3bd1e081 | 910 | struct consumer_data *consumer_data = data; |
1d4b027a | 911 | |
3bd1e081 | 912 | DBG("[thread] Manage consumer started"); |
1d4b027a | 913 | |
3bd1e081 | 914 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
915 | if (ret < 0) { |
916 | goto error; | |
917 | } | |
918 | ||
5eb91c98 DG |
919 | /* |
920 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
921 | * Nothing more will be added to this poll set. | |
922 | */ | |
923 | ret = create_thread_poll_set(&events, 2); | |
924 | if (ret < 0) { | |
925 | goto error; | |
926 | } | |
273ea72c | 927 | |
3bd1e081 | 928 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
929 | if (ret < 0) { |
930 | goto error; | |
931 | } | |
932 | ||
933 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
934 | |
935 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 936 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 937 | if (ret < 0) { |
273ea72c DG |
938 | goto error; |
939 | } | |
940 | ||
5eb91c98 DG |
941 | for (i = 0; i < nb_fd; i++) { |
942 | /* Fetch once the poll data */ | |
943 | revents = LTTNG_POLL_GETEV(&events, i); | |
944 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
945 | ||
946 | /* Thread quit pipe has been closed. Killing thread. */ | |
947 | ret = check_thread_quit_pipe(pollfd, revents); | |
948 | if (ret) { | |
949 | goto error; | |
950 | } | |
951 | ||
952 | /* Event on the registration socket */ | |
3bd1e081 | 953 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 954 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 955 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
956 | goto error; |
957 | } | |
958 | } | |
273ea72c DG |
959 | } |
960 | ||
3bd1e081 | 961 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
962 | if (sock < 0) { |
963 | goto error; | |
964 | } | |
965 | ||
3bd1e081 | 966 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 967 | |
712ea556 | 968 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
969 | ret = lttcomm_recv_unix_sock(sock, &code, |
970 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
971 | if (ret <= 0) { |
972 | goto error; | |
973 | } | |
974 | ||
3bd1e081 MD |
975 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
976 | consumer_data->cmd_sock = | |
977 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
978 | if (consumer_data->cmd_sock < 0) { | |
979 | sem_post(&consumer_data->sem); | |
48842b30 | 980 | PERROR("consumer connect"); |
1d4b027a DG |
981 | goto error; |
982 | } | |
983 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
984 | sem_post(&consumer_data->sem); |
985 | DBG("consumer command socket ready"); | |
1d4b027a | 986 | } else { |
3bd1e081 | 987 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
988 | lttcomm_get_readable_code(-code)); |
989 | goto error; | |
990 | } | |
991 | ||
54d01ffb | 992 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 993 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 994 | if (ret < 0) { |
72079cae DG |
995 | goto error; |
996 | } | |
997 | ||
5eb91c98 DG |
998 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
999 | if (ret < 0) { | |
72079cae | 1000 | goto error; |
5eb91c98 DG |
1001 | } |
1002 | ||
1003 | /* Update number of fd */ | |
1004 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1005 | ||
1006 | /* Inifinite blocking call, waiting for transmission */ | |
1007 | ret = lttng_poll_wait(&events, -1); | |
1008 | if (ret < 0) { | |
72079cae DG |
1009 | goto error; |
1010 | } | |
1011 | ||
5eb91c98 DG |
1012 | for (i = 0; i < nb_fd; i++) { |
1013 | /* Fetch once the poll data */ | |
1014 | revents = LTTNG_POLL_GETEV(&events, i); | |
1015 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1016 | ||
1017 | /* Thread quit pipe has been closed. Killing thread. */ | |
1018 | ret = check_thread_quit_pipe(pollfd, revents); | |
1019 | if (ret) { | |
1020 | goto error; | |
1021 | } | |
1022 | ||
1023 | /* Event on the kconsumerd socket */ | |
1024 | if (pollfd == sock) { | |
1025 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1026 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1027 | goto error; |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | ||
712ea556 | 1032 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1033 | ret = lttcomm_recv_unix_sock(sock, &code, |
1034 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1035 | if (ret <= 0) { |
3bd1e081 | 1036 | ERR("consumer closed the command socket"); |
712ea556 | 1037 | goto error; |
6f61d021 | 1038 | } |
1d4b027a | 1039 | |
3bd1e081 | 1040 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1041 | |
1d4b027a | 1042 | error: |
3bd1e081 MD |
1043 | DBG("consumer thread dying"); |
1044 | close(consumer_data->err_sock); | |
1045 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1046 | close(sock); |
273ea72c | 1047 | |
3bd1e081 MD |
1048 | unlink(consumer_data->err_unix_sock_path); |
1049 | unlink(consumer_data->cmd_unix_sock_path); | |
1050 | consumer_data->pid = 0; | |
1d4b027a | 1051 | |
5eb91c98 | 1052 | lttng_poll_clean(&events); |
0177d773 | 1053 | |
5eb91c98 | 1054 | return NULL; |
099e26bd DG |
1055 | } |
1056 | ||
099e26bd DG |
1057 | /* |
1058 | * This thread manage application communication. | |
1d4b027a DG |
1059 | */ |
1060 | static void *thread_manage_apps(void *data) | |
099e26bd | 1061 | { |
5eb91c98 DG |
1062 | int i, ret, pollfd; |
1063 | uint32_t revents, nb_fd; | |
099e26bd | 1064 | struct ust_command ust_cmd; |
5eb91c98 | 1065 | struct lttng_poll_event events; |
099e26bd DG |
1066 | |
1067 | DBG("[thread] Manage application started"); | |
1068 | ||
f6a9efaa DG |
1069 | rcu_register_thread(); |
1070 | rcu_thread_online(); | |
1071 | ||
5eb91c98 DG |
1072 | ret = create_thread_poll_set(&events, 2); |
1073 | if (ret < 0) { | |
1074 | goto error; | |
1075 | } | |
099e26bd | 1076 | |
5eb91c98 DG |
1077 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1078 | if (ret < 0) { | |
1079 | goto error; | |
1080 | } | |
099e26bd | 1081 | |
5eb91c98 DG |
1082 | while (1) { |
1083 | /* Zeroed the events structure */ | |
1084 | lttng_poll_reset(&events); | |
0177d773 | 1085 | |
5eb91c98 | 1086 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1087 | |
1088 | DBG("Apps thread polling on %d fds", nb_fd); | |
1089 | ||
1090 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1091 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1092 | if (ret < 0) { |
099e26bd DG |
1093 | goto error; |
1094 | } | |
1095 | ||
5eb91c98 DG |
1096 | for (i = 0; i < nb_fd; i++) { |
1097 | /* Fetch once the poll data */ | |
1098 | revents = LTTNG_POLL_GETEV(&events, i); | |
1099 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1100 | ||
1101 | /* Thread quit pipe has been closed. Killing thread. */ | |
1102 | ret = check_thread_quit_pipe(pollfd, revents); | |
1103 | if (ret) { | |
099e26bd | 1104 | goto error; |
5eb91c98 | 1105 | } |
099e26bd | 1106 | |
5eb91c98 DG |
1107 | /* Inspect the apps cmd pipe */ |
1108 | if (pollfd == apps_cmd_pipe[0]) { | |
1109 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1110 | ERR("Apps command pipe error"); | |
0177d773 | 1111 | goto error; |
5eb91c98 DG |
1112 | } else if (revents & LPOLLIN) { |
1113 | /* Empty pipe */ | |
1114 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1115 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1116 | perror("read apps cmd pipe"); | |
1117 | goto error; | |
1118 | } | |
099e26bd | 1119 | |
5eb91c98 | 1120 | /* Register applicaton to the session daemon */ |
56fff090 | 1121 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1122 | ust_cmd.sock); |
88ff5b7f | 1123 | if (ret == -ENOMEM) { |
5eb91c98 | 1124 | goto error; |
88ff5b7f MD |
1125 | } else if (ret < 0) { |
1126 | break; | |
5eb91c98 DG |
1127 | } |
1128 | ||
acc7b41b MD |
1129 | /* |
1130 | * Add channel(s) and event(s) to newly registered apps | |
1131 | * from lttng global UST domain. | |
1132 | */ | |
1133 | update_ust_app(ust_cmd.sock); | |
1134 | ||
5eb91c98 DG |
1135 | ret = ustctl_register_done(ust_cmd.sock); |
1136 | if (ret < 0) { | |
1137 | /* | |
1138 | * If the registration is not possible, we simply | |
1139 | * unregister the apps and continue | |
1140 | */ | |
56fff090 | 1141 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1142 | } else { |
1143 | /* | |
1144 | * We just need here to monitor the close of the UST | |
1145 | * socket and poll set monitor those by default. | |
1146 | */ | |
1147 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1148 | if (ret < 0) { | |
1149 | goto error; | |
1150 | } | |
1151 | ||
54d01ffb DG |
1152 | DBG("Apps with sock %d added to poll set", |
1153 | ust_cmd.sock); | |
5eb91c98 | 1154 | } |
487cf67c | 1155 | |
5eb91c98 | 1156 | break; |
0177d773 | 1157 | } |
5eb91c98 DG |
1158 | } else { |
1159 | /* | |
54d01ffb DG |
1160 | * At this point, we know that a registered application made |
1161 | * the event at poll_wait. | |
5eb91c98 DG |
1162 | */ |
1163 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1164 | /* Removing from the poll set */ | |
1165 | ret = lttng_poll_del(&events, pollfd); | |
1166 | if (ret < 0) { | |
1167 | goto error; | |
1168 | } | |
099e26bd | 1169 | |
b9d9b220 | 1170 | /* Socket closed on remote end. */ |
56fff090 | 1171 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1172 | break; |
1173 | } | |
099e26bd DG |
1174 | } |
1175 | } | |
099e26bd DG |
1176 | } |
1177 | ||
1178 | error: | |
1179 | DBG("Application communication apps dying"); | |
1180 | close(apps_cmd_pipe[0]); | |
1181 | close(apps_cmd_pipe[1]); | |
1182 | ||
5eb91c98 | 1183 | lttng_poll_clean(&events); |
099e26bd | 1184 | |
f6a9efaa DG |
1185 | rcu_thread_offline(); |
1186 | rcu_unregister_thread(); | |
099e26bd DG |
1187 | return NULL; |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Dispatch request from the registration threads to the application | |
1192 | * communication thread. | |
1193 | */ | |
1194 | static void *thread_dispatch_ust_registration(void *data) | |
1195 | { | |
1196 | int ret; | |
1197 | struct cds_wfq_node *node; | |
1198 | struct ust_command *ust_cmd = NULL; | |
1199 | ||
1200 | DBG("[thread] Dispatch UST command started"); | |
1201 | ||
1202 | while (!dispatch_thread_exit) { | |
1203 | /* Atomically prepare the queue futex */ | |
1204 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1205 | ||
1206 | do { | |
1207 | /* Dequeue command for registration */ | |
1208 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1209 | if (node == NULL) { | |
00a17c97 | 1210 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1211 | /* Continue thread execution */ |
1212 | break; | |
1213 | } | |
1214 | ||
1215 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1216 | ||
2f50c8a3 DG |
1217 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1218 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1219 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1220 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1221 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1222 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1223 | /* |
1224 | * Inform apps thread of the new application registration. This | |
1225 | * call is blocking so we can be assured that the data will be read | |
1226 | * at some point in time or wait to the end of the world :) | |
1227 | */ | |
1228 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1229 | sizeof(struct ust_command)); | |
1230 | if (ret < 0) { | |
1231 | perror("write apps cmd pipe"); | |
1232 | if (errno == EBADF) { | |
1233 | /* | |
1234 | * We can't inform the application thread to process | |
1235 | * registration. We will exit or else application | |
1236 | * registration will not occur and tracing will never | |
1237 | * start. | |
1238 | */ | |
1239 | goto error; | |
1240 | } | |
1241 | } | |
1242 | free(ust_cmd); | |
1243 | } while (node != NULL); | |
1244 | ||
1245 | /* Futex wait on queue. Blocking call on futex() */ | |
1246 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1247 | } | |
1248 | ||
1249 | error: | |
1250 | DBG("Dispatch thread dying"); | |
1251 | return NULL; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * This thread manage application registration. | |
1256 | */ | |
1257 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1258 | { |
5eb91c98 DG |
1259 | int sock = 0, i, ret, pollfd; |
1260 | uint32_t revents, nb_fd; | |
1261 | struct lttng_poll_event events; | |
099e26bd DG |
1262 | /* |
1263 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1264 | * freed in the manage apps thread. | |
1265 | */ | |
1266 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1267 | |
099e26bd | 1268 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1269 | |
1270 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1271 | if (ret < 0) { | |
1272 | goto error; | |
1273 | } | |
1274 | ||
5eb91c98 DG |
1275 | /* |
1276 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1277 | * more will be added to this poll set. | |
1278 | */ | |
1279 | ret = create_thread_poll_set(&events, 2); | |
1280 | if (ret < 0) { | |
1281 | goto error; | |
1282 | } | |
273ea72c | 1283 | |
5eb91c98 DG |
1284 | /* Add the application registration socket */ |
1285 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1286 | if (ret < 0) { | |
1287 | goto error; | |
1288 | } | |
273ea72c | 1289 | |
1d4b027a | 1290 | /* Notify all applications to register */ |
0fdd1e2c DG |
1291 | ret = notify_ust_apps(1); |
1292 | if (ret < 0) { | |
1293 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1294 | "Execution continues but there might be problem for already\n" |
1295 | "running applications that wishes to register."); | |
0fdd1e2c | 1296 | } |
1d4b027a DG |
1297 | |
1298 | while (1) { | |
1299 | DBG("Accepting application registration"); | |
273ea72c | 1300 | |
5eb91c98 DG |
1301 | nb_fd = LTTNG_POLL_GETNB(&events); |
1302 | ||
273ea72c | 1303 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1304 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1305 | if (ret < 0) { |
273ea72c DG |
1306 | goto error; |
1307 | } | |
1308 | ||
5eb91c98 DG |
1309 | for (i = 0; i < nb_fd; i++) { |
1310 | /* Fetch once the poll data */ | |
1311 | revents = LTTNG_POLL_GETEV(&events, i); | |
1312 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1313 | |
5eb91c98 DG |
1314 | /* Thread quit pipe has been closed. Killing thread. */ |
1315 | ret = check_thread_quit_pipe(pollfd, revents); | |
1316 | if (ret) { | |
90014c57 DG |
1317 | goto error; |
1318 | } | |
1d4b027a | 1319 | |
5eb91c98 DG |
1320 | /* Event on the registration socket */ |
1321 | if (pollfd == apps_sock) { | |
1322 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1323 | ERR("Register apps socket poll error"); | |
1324 | goto error; | |
1325 | } else if (revents & LPOLLIN) { | |
1326 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1327 | if (sock < 0) { | |
1328 | goto error; | |
1329 | } | |
099e26bd | 1330 | |
5eb91c98 | 1331 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1332 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1333 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1334 | perror("ust command zmalloc"); |
5eb91c98 DG |
1335 | goto error; |
1336 | } | |
1d4b027a | 1337 | |
5eb91c98 DG |
1338 | /* |
1339 | * Using message-based transmissions to ensure we don't | |
1340 | * have to deal with partially received messages. | |
1341 | */ | |
1342 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1343 | sizeof(struct ust_register_msg)); | |
1344 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1345 | if (ret < 0) { | |
1346 | perror("lttcomm_recv_unix_sock register apps"); | |
1347 | } else { | |
1348 | ERR("Wrong size received on apps register"); | |
1349 | } | |
1350 | free(ust_cmd); | |
1351 | close(sock); | |
1352 | continue; | |
1353 | } | |
099e26bd | 1354 | |
5eb91c98 | 1355 | ust_cmd->sock = sock; |
099e26bd | 1356 | |
5eb91c98 DG |
1357 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1358 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1359 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1360 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1361 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1362 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1363 | |
5eb91c98 DG |
1364 | /* |
1365 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1366 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1367 | */ |
1368 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1369 | ||
1370 | /* | |
1371 | * Wake the registration queue futex. Implicit memory | |
1372 | * barrier with the exchange in cds_wfq_enqueue. | |
1373 | */ | |
1374 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1375 | } | |
1376 | } | |
90014c57 | 1377 | } |
1d4b027a DG |
1378 | } |
1379 | ||
1380 | error: | |
0fdd1e2c DG |
1381 | DBG("UST Registration thread dying"); |
1382 | ||
1383 | /* Notify that the registration thread is gone */ | |
1384 | notify_ust_apps(0); | |
1385 | ||
1386 | close(apps_sock); | |
1387 | close(sock); | |
273ea72c | 1388 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1389 | |
5eb91c98 DG |
1390 | lttng_poll_clean(&events); |
1391 | ||
1d4b027a DG |
1392 | return NULL; |
1393 | } | |
1394 | ||
8c0faa1d | 1395 | /* |
3bd1e081 | 1396 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1397 | * exec or it will fails. |
8c0faa1d | 1398 | */ |
3bd1e081 | 1399 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1400 | { |
1401 | int ret; | |
ee0b0061 DG |
1402 | struct timespec timeout; |
1403 | ||
1404 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1405 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1406 | |
1407 | /* Setup semaphore */ | |
3bd1e081 | 1408 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1409 | if (ret < 0) { |
3bd1e081 | 1410 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1411 | goto error; |
1412 | } | |
8c0faa1d | 1413 | |
3bd1e081 MD |
1414 | ret = pthread_create(&consumer_data->thread, NULL, |
1415 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1416 | if (ret != 0) { |
3bd1e081 | 1417 | PERROR("pthread_create consumer"); |
ee0b0061 | 1418 | ret = -1; |
8c0faa1d DG |
1419 | goto error; |
1420 | } | |
1421 | ||
ee0b0061 DG |
1422 | /* Get time for sem_timedwait absolute timeout */ |
1423 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1424 | if (ret < 0) { | |
3bd1e081 | 1425 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1426 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1427 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1428 | } else { |
1429 | /* Normal timeout if the gettime was successful */ | |
1430 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1431 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1432 | } |
8c0faa1d | 1433 | |
ee0b0061 DG |
1434 | if (ret < 0) { |
1435 | if (errno == ETIMEDOUT) { | |
1436 | /* | |
1437 | * Call has timed out so we kill the kconsumerd_thread and return | |
1438 | * an error. | |
1439 | */ | |
3bd1e081 MD |
1440 | ERR("The consumer thread was never ready. Killing it"); |
1441 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1442 | if (ret < 0) { |
3bd1e081 | 1443 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1444 | } |
1445 | } else { | |
3bd1e081 | 1446 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1447 | } |
1448 | goto error; | |
1449 | } | |
1450 | ||
3bd1e081 MD |
1451 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1452 | if (consumer_data->pid == 0) { | |
712ea556 | 1453 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1454 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1455 | goto error; |
1456 | } | |
3bd1e081 | 1457 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1458 | |
8c0faa1d DG |
1459 | return 0; |
1460 | ||
1461 | error: | |
1462 | return ret; | |
1463 | } | |
1464 | ||
d9800920 | 1465 | /* |
3bd1e081 | 1466 | * Join consumer thread |
d9800920 | 1467 | */ |
3bd1e081 | 1468 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1469 | { |
1470 | void *status; | |
1471 | int ret; | |
1472 | ||
3bd1e081 MD |
1473 | if (consumer_data->pid != 0) { |
1474 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1475 | if (ret) { |
3bd1e081 | 1476 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1477 | return ret; |
1478 | } | |
3bd1e081 | 1479 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1480 | } else { |
1481 | return 0; | |
1482 | } | |
1483 | } | |
1484 | ||
8c0faa1d | 1485 | /* |
3bd1e081 | 1486 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1487 | * |
d063d709 | 1488 | * Return pid if successful else -1. |
8c0faa1d | 1489 | */ |
3bd1e081 | 1490 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1491 | { |
1492 | int ret; | |
1493 | pid_t pid; | |
53086306 | 1494 | const char *verbosity; |
8c0faa1d | 1495 | |
3bd1e081 | 1496 | DBG("Spawning consumerd"); |
c49dc785 | 1497 | |
8c0faa1d DG |
1498 | pid = fork(); |
1499 | if (pid == 0) { | |
1500 | /* | |
3bd1e081 | 1501 | * Exec consumerd. |
8c0faa1d | 1502 | */ |
3bd1e081 | 1503 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1504 | verbosity = "--verbose"; |
1505 | } else { | |
1506 | verbosity = "--quiet"; | |
1507 | } | |
3bd1e081 MD |
1508 | switch (consumer_data->type) { |
1509 | case LTTNG_CONSUMER_KERNEL: | |
1510 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
7753dea8 MD |
1511 | "lttng-consumerd", verbosity, "-k", |
1512 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1513 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1514 | NULL); | |
3bd1e081 | 1515 | break; |
7753dea8 MD |
1516 | case LTTNG_CONSUMER64_UST: |
1517 | { | |
1518 | char path[PATH_MAX]; | |
1519 | ||
1520 | snprintf(path, PATH_MAX, "%s/%s", | |
1521 | consumerd64_bindir, consumerd64_prog); | |
1522 | execl(path, verbosity, "-u", | |
1523 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1524 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1525 | NULL); | |
3bd1e081 | 1526 | break; |
7753dea8 MD |
1527 | } |
1528 | case LTTNG_CONSUMER32_UST: | |
1529 | { | |
1530 | char path[PATH_MAX]; | |
1531 | ||
1532 | snprintf(path, PATH_MAX, "%s/%s", | |
1533 | consumerd32_bindir, consumerd32_prog); | |
1534 | execl(path, verbosity, "-u", | |
1535 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1536 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1537 | NULL); | |
1538 | break; | |
1539 | } | |
3bd1e081 MD |
1540 | default: |
1541 | perror("unknown consumer type"); | |
1542 | exit(EXIT_FAILURE); | |
1543 | } | |
8c0faa1d DG |
1544 | if (errno != 0) { |
1545 | perror("kernel start consumer exec"); | |
1546 | } | |
1547 | exit(EXIT_FAILURE); | |
1548 | } else if (pid > 0) { | |
1549 | ret = pid; | |
8c0faa1d | 1550 | } else { |
3bd1e081 | 1551 | perror("start consumer fork"); |
8c0faa1d | 1552 | ret = -errno; |
8c0faa1d | 1553 | } |
8c0faa1d DG |
1554 | return ret; |
1555 | } | |
1556 | ||
693bd40b | 1557 | /* |
3bd1e081 | 1558 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1559 | */ |
3bd1e081 | 1560 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1561 | { |
1562 | int ret; | |
1563 | ||
3bd1e081 MD |
1564 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1565 | if (consumer_data->pid != 0) { | |
1566 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1567 | goto end; |
1568 | } | |
693bd40b | 1569 | |
3bd1e081 | 1570 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1571 | if (ret < 0) { |
3bd1e081 MD |
1572 | ERR("Spawning consumerd failed"); |
1573 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1574 | goto error; |
693bd40b | 1575 | } |
c49dc785 | 1576 | |
3bd1e081 MD |
1577 | /* Setting up the consumer_data pid */ |
1578 | consumer_data->pid = ret; | |
48842b30 | 1579 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1580 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1581 | |
3bd1e081 MD |
1582 | DBG2("Spawning consumer control thread"); |
1583 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1584 | if (ret < 0) { |
3bd1e081 | 1585 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1586 | goto error; |
1587 | } | |
1588 | ||
c49dc785 | 1589 | end: |
693bd40b DG |
1590 | return 0; |
1591 | ||
1592 | error: | |
1593 | return ret; | |
1594 | } | |
1595 | ||
b73401da | 1596 | /* |
d063d709 | 1597 | * modprobe_kernel_modules |
b73401da DG |
1598 | */ |
1599 | static int modprobe_kernel_modules(void) | |
1600 | { | |
ab147185 | 1601 | int ret = 0, i; |
b73401da DG |
1602 | char modprobe[256]; |
1603 | ||
ab147185 MD |
1604 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1605 | ret = snprintf(modprobe, sizeof(modprobe), | |
1606 | "/sbin/modprobe %s%s", | |
24b487b8 | 1607 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1608 | kernel_modules_list[i].name); |
b73401da DG |
1609 | if (ret < 0) { |
1610 | perror("snprintf modprobe"); | |
1611 | goto error; | |
1612 | } | |
ab147185 | 1613 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1614 | ret = system(modprobe); |
ab147185 MD |
1615 | if (ret == -1) { |
1616 | ERR("Unable to launch modprobe for module %s", | |
1617 | kernel_modules_list[i].name); | |
1618 | } else if (kernel_modules_list[i].required | |
d9800920 | 1619 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1620 | ERR("Unable to load module %s", |
1621 | kernel_modules_list[i].name); | |
1622 | } else { | |
1623 | DBG("Modprobe successfully %s", | |
1624 | kernel_modules_list[i].name); | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | error: | |
1629 | return ret; | |
1630 | } | |
1631 | ||
b73401da | 1632 | /* |
d063d709 | 1633 | * mount_debugfs |
b73401da DG |
1634 | */ |
1635 | static int mount_debugfs(char *path) | |
1636 | { | |
1637 | int ret; | |
1638 | char *type = "debugfs"; | |
1639 | ||
996b65c8 | 1640 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1641 | if (ret < 0) { |
7272acf5 | 1642 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1643 | goto error; |
1644 | } | |
1645 | ||
1646 | ret = mount(type, path, type, 0, NULL); | |
1647 | if (ret < 0) { | |
7272acf5 | 1648 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1649 | goto error; |
1650 | } | |
1651 | ||
1652 | DBG("Mounted debugfs successfully at %s", path); | |
1653 | ||
1654 | error: | |
1655 | return ret; | |
1656 | } | |
1657 | ||
8c0faa1d | 1658 | /* |
d063d709 | 1659 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1660 | */ |
f3ed775e | 1661 | static void init_kernel_tracer(void) |
8c0faa1d | 1662 | { |
b73401da DG |
1663 | int ret; |
1664 | char *proc_mounts = "/proc/mounts"; | |
1665 | char line[256]; | |
684d34d2 | 1666 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1667 | FILE *fp; |
1668 | ||
1669 | /* Detect debugfs */ | |
1670 | fp = fopen(proc_mounts, "r"); | |
1671 | if (fp == NULL) { | |
1672 | ERR("Unable to probe %s", proc_mounts); | |
1673 | goto error; | |
1674 | } | |
1675 | ||
1676 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1677 | if (strstr(line, "debugfs") != NULL) { | |
1678 | /* Remove first string */ | |
1679 | strtok(line, " "); | |
1680 | /* Dup string here so we can reuse line later on */ | |
1681 | debugfs_path = strdup(strtok(NULL, " ")); | |
1682 | DBG("Got debugfs path : %s", debugfs_path); | |
1683 | break; | |
1684 | } | |
1685 | } | |
1686 | ||
1687 | fclose(fp); | |
1688 | ||
1689 | /* Mount debugfs if needded */ | |
1690 | if (debugfs_path == NULL) { | |
1691 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1692 | if (ret < 0) { | |
1693 | perror("asprintf debugfs path"); | |
1694 | goto error; | |
1695 | } | |
1696 | ret = mount_debugfs(debugfs_path); | |
1697 | if (ret < 0) { | |
7272acf5 | 1698 | perror("Cannot mount debugfs"); |
b73401da DG |
1699 | goto error; |
1700 | } | |
1701 | } | |
1702 | ||
1703 | /* Modprobe lttng kernel modules */ | |
1704 | ret = modprobe_kernel_modules(); | |
1705 | if (ret < 0) { | |
1706 | goto error; | |
1707 | } | |
1708 | ||
1709 | /* Setup lttng kernel path */ | |
1710 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1711 | if (ret < 0) { | |
1712 | perror("asprintf lttng path"); | |
1713 | goto error; | |
1714 | } | |
1715 | ||
1716 | /* Open debugfs lttng */ | |
1717 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1718 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1719 | DBG("Failed to open %s", lttng_path); |
1720 | goto error; | |
8c0faa1d DG |
1721 | } |
1722 | ||
b73401da DG |
1723 | free(lttng_path); |
1724 | free(debugfs_path); | |
f3ed775e | 1725 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1726 | return; |
1727 | ||
1728 | error: | |
1729 | if (lttng_path) { | |
1730 | free(lttng_path); | |
1731 | } | |
1732 | if (debugfs_path) { | |
1733 | free(debugfs_path); | |
1734 | } | |
1735 | WARN("No kernel tracer available"); | |
1736 | kernel_tracer_fd = 0; | |
1737 | return; | |
f3ed775e | 1738 | } |
33a2b854 | 1739 | |
f3ed775e | 1740 | /* |
54d01ffb | 1741 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1742 | */ |
54d01ffb | 1743 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1744 | { |
f40799e8 | 1745 | int ret = 0; |
8c0faa1d | 1746 | |
3bd1e081 | 1747 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1748 | /* |
54d01ffb DG |
1749 | * Assign default kernel consumer socket if no consumer assigned to the |
1750 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1751 | * an extra security check. | |
d9800920 DG |
1752 | */ |
1753 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1754 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1755 | } |
1756 | ||
2bdd86d4 | 1757 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1758 | if (ret < 0) { |
f3ed775e DG |
1759 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1760 | goto error; | |
1761 | } | |
1d4b027a | 1762 | |
3bd1e081 | 1763 | session->consumer_fds_sent = 1; |
f3ed775e | 1764 | } |
1d4b027a DG |
1765 | |
1766 | error: | |
1767 | return ret; | |
8c0faa1d DG |
1768 | } |
1769 | ||
0177d773 DG |
1770 | /* |
1771 | * Create an UST session and add it to the session ust list. | |
1772 | */ | |
44d3bd01 DG |
1773 | static int create_ust_session(struct ltt_session *session, |
1774 | struct lttng_domain *domain) | |
0177d773 | 1775 | { |
44d3bd01 | 1776 | int ret; |
48842b30 | 1777 | unsigned int uid; |
13384287 | 1778 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1779 | |
1780 | switch (domain->type) { | |
48842b30 | 1781 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1782 | break; |
1783 | default: | |
13384287 | 1784 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1785 | goto error; |
1786 | } | |
0177d773 DG |
1787 | |
1788 | DBG("Creating UST session"); | |
1789 | ||
44e96653 | 1790 | uid = session->uid; |
48842b30 | 1791 | lus = trace_ust_create_session(session->path, uid, domain); |
0177d773 | 1792 | if (lus == NULL) { |
44d3bd01 | 1793 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1794 | goto error; |
1795 | } | |
1796 | ||
48842b30 | 1797 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1798 | geteuid(), allowed_group()); |
1799 | if (ret < 0) { | |
1800 | if (ret != -EEXIST) { | |
1801 | ERR("Trace directory creation error"); | |
44d3bd01 | 1802 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1803 | goto error; |
1804 | } | |
1805 | } | |
1806 | ||
f6a9efaa DG |
1807 | /* The domain type dictate different actions on session creation */ |
1808 | switch (domain->type) { | |
48842b30 DG |
1809 | case LTTNG_DOMAIN_UST: |
1810 | /* No ustctl for the global UST domain */ | |
1811 | break; | |
1812 | default: | |
36dc12cc | 1813 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1814 | goto error; |
0177d773 | 1815 | } |
f6a9efaa | 1816 | session->ust_session = lus; |
44d3bd01 DG |
1817 | |
1818 | return LTTCOMM_OK; | |
0177d773 DG |
1819 | |
1820 | error: | |
1821 | free(lus); | |
1822 | return ret; | |
1823 | } | |
1824 | ||
333f285e | 1825 | /* |
d063d709 | 1826 | * Create a kernel tracer session then create the default channel. |
333f285e | 1827 | */ |
f3ed775e | 1828 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1829 | { |
f3ed775e | 1830 | int ret; |
f3ed775e DG |
1831 | |
1832 | DBG("Creating kernel session"); | |
1833 | ||
1834 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1835 | if (ret < 0) { | |
1836 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1837 | goto error; | |
333f285e DG |
1838 | } |
1839 | ||
d9800920 | 1840 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1841 | if (kconsumer_data.cmd_sock) { |
1842 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1843 | } |
1844 | ||
63053e7c DG |
1845 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1846 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1847 | if (ret < 0) { |
996b65c8 | 1848 | if (ret != -EEXIST) { |
7a485870 DG |
1849 | ERR("Trace directory creation error"); |
1850 | goto error; | |
1851 | } | |
1852 | } | |
1853 | ||
f3ed775e DG |
1854 | error: |
1855 | return ret; | |
333f285e DG |
1856 | } |
1857 | ||
6c9cc2ab DG |
1858 | /* |
1859 | * Using the session list, filled a lttng_session array to send back to the | |
1860 | * client for session listing. | |
1861 | * | |
1862 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1863 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1864 | */ |
1865 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1866 | { | |
1867 | int i = 0; | |
1868 | struct ltt_session *session; | |
1869 | ||
1870 | DBG("Getting all available session"); | |
1871 | /* | |
1872 | * Iterate over session list and append data after the control struct in | |
1873 | * the buffer. | |
1874 | */ | |
1875 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1876 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1877 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1878 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1879 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1880 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1881 | i++; |
1882 | } | |
1883 | } | |
1884 | ||
9f19cc17 DG |
1885 | /* |
1886 | * Fill lttng_channel array of all channels. | |
1887 | */ | |
b551a063 | 1888 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1889 | struct lttng_channel *channels) |
1890 | { | |
1891 | int i = 0; | |
1892 | struct ltt_kernel_channel *kchan; | |
1893 | ||
1894 | DBG("Listing channels for session %s", session->name); | |
1895 | ||
b551a063 DG |
1896 | switch (domain) { |
1897 | case LTTNG_DOMAIN_KERNEL: | |
1898 | /* Kernel channels */ | |
1899 | if (session->kernel_session != NULL) { | |
1900 | cds_list_for_each_entry(kchan, | |
1901 | &session->kernel_session->channel_list.head, list) { | |
1902 | /* Copy lttng_channel struct to array */ | |
1903 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1904 | channels[i].enabled = kchan->enabled; | |
1905 | i++; | |
1906 | } | |
1907 | } | |
1908 | break; | |
1909 | case LTTNG_DOMAIN_UST: | |
1910 | { | |
1911 | struct cds_lfht_iter iter; | |
1912 | struct ltt_ust_channel *uchan; | |
1913 | ||
1914 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1915 | &iter, uchan, node) { | |
1916 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1917 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1918 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1919 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1920 | channels[i].attr.switch_timer_interval = | |
1921 | uchan->attr.switch_timer_interval; | |
1922 | channels[i].attr.read_timer_interval = | |
1923 | uchan->attr.read_timer_interval; | |
aea829b3 | 1924 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
1925 | switch (uchan->attr.output) { |
1926 | case LTTNG_UST_MMAP: | |
1927 | default: | |
1928 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
1929 | break; | |
1930 | } | |
befe0905 | 1931 | i++; |
b551a063 DG |
1932 | } |
1933 | break; | |
1934 | } | |
1935 | default: | |
1936 | break; | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | /* | |
1941 | * Create a list of ust global domain events. | |
1942 | */ | |
1943 | static int list_lttng_ust_global_events(char *channel_name, | |
1944 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1945 | { | |
1946 | int i = 0, ret = 0; | |
1947 | unsigned int nb_event = 0; | |
1948 | struct cds_lfht_iter iter; | |
d7b75b30 | 1949 | struct cds_lfht_node *node; |
b551a063 DG |
1950 | struct ltt_ust_channel *uchan; |
1951 | struct ltt_ust_event *uevent; | |
1952 | struct lttng_event *tmp; | |
1953 | ||
1954 | DBG("Listing UST global events for channel %s", channel_name); | |
1955 | ||
1956 | rcu_read_lock(); | |
1957 | ||
d7b75b30 DG |
1958 | node = hashtable_lookup(ust_global->channels, (void *) channel_name, |
1959 | strlen(channel_name), &iter); | |
1960 | if (node == NULL) { | |
1961 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
1962 | goto error; | |
b551a063 DG |
1963 | } |
1964 | ||
d7b75b30 DG |
1965 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
1966 | ||
1967 | nb_event += hashtable_get_count(uchan->events); | |
1968 | ||
b551a063 DG |
1969 | if (nb_event == 0) { |
1970 | ret = nb_event; | |
1971 | goto error; | |
1972 | } | |
1973 | ||
1974 | DBG3("Listing UST global %d events", nb_event); | |
1975 | ||
1976 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1977 | if (tmp == NULL) { | |
1978 | ret = -LTTCOMM_FATAL; | |
1979 | goto error; | |
1980 | } | |
1981 | ||
d7b75b30 DG |
1982 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
1983 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1984 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1985 | tmp[i].enabled = uevent->enabled; | |
1986 | switch (uevent->attr.instrumentation) { | |
1987 | case LTTNG_UST_TRACEPOINT: | |
1988 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1989 | break; | |
1990 | case LTTNG_UST_PROBE: | |
1991 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1992 | break; | |
1993 | case LTTNG_UST_FUNCTION: | |
1994 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1995 | break; | |
9f19cc17 | 1996 | } |
d7b75b30 | 1997 | i++; |
9f19cc17 DG |
1998 | } |
1999 | ||
b551a063 DG |
2000 | ret = nb_event; |
2001 | *events = tmp; | |
2002 | ||
2003 | error: | |
2004 | rcu_read_unlock(); | |
2005 | return ret; | |
9f19cc17 DG |
2006 | } |
2007 | ||
2008 | /* | |
b551a063 | 2009 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2010 | */ |
b551a063 DG |
2011 | static int list_lttng_kernel_events(char *channel_name, |
2012 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2013 | { |
b551a063 DG |
2014 | int i = 0, ret; |
2015 | unsigned int nb_event; | |
9f19cc17 | 2016 | struct ltt_kernel_event *event; |
b551a063 DG |
2017 | struct ltt_kernel_channel *kchan; |
2018 | ||
2019 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2020 | if (kchan == NULL) { | |
2021 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2022 | goto error; | |
2023 | } | |
2024 | ||
2025 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2026 | |
2027 | DBG("Listing events for channel %s", kchan->channel->name); | |
2028 | ||
b551a063 DG |
2029 | if (nb_event == 0) { |
2030 | ret = nb_event; | |
2031 | goto error; | |
2032 | } | |
2033 | ||
2034 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2035 | if (*events == NULL) { | |
2036 | ret = LTTCOMM_FATAL; | |
2037 | goto error; | |
2038 | } | |
2039 | ||
9f19cc17 DG |
2040 | /* Kernel channels */ |
2041 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2042 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2043 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2044 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2045 | switch (event->event->instrumentation) { |
2046 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2047 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2048 | break; |
2049 | case LTTNG_KERNEL_KPROBE: | |
2050 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2051 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2052 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2053 | sizeof(struct lttng_kernel_kprobe)); |
2054 | break; | |
2055 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2056 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2057 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2058 | sizeof(struct lttng_kernel_function)); |
2059 | break; | |
0133c199 | 2060 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2061 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2062 | break; |
a54bd42d | 2063 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2064 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2065 | break; |
7a3d1328 MD |
2066 | case LTTNG_KERNEL_ALL: |
2067 | assert(0); | |
2068 | break; | |
9f19cc17 DG |
2069 | } |
2070 | i++; | |
2071 | } | |
b551a063 DG |
2072 | |
2073 | return nb_event; | |
2074 | ||
2075 | error: | |
2076 | return ret; | |
9f19cc17 DG |
2077 | } |
2078 | ||
fac6795d | 2079 | /* |
54d01ffb | 2080 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2081 | */ |
54d01ffb DG |
2082 | static int cmd_disable_channel(struct ltt_session *session, |
2083 | int domain, char *channel_name) | |
fac6795d | 2084 | { |
54d01ffb | 2085 | int ret; |
78f0bacd DG |
2086 | struct ltt_ust_session *usess; |
2087 | ||
2088 | usess = session->ust_session; | |
379473d2 | 2089 | |
54d01ffb | 2090 | switch (domain) { |
78f0bacd DG |
2091 | case LTTNG_DOMAIN_KERNEL: |
2092 | { | |
2093 | ret = channel_kernel_disable(session->kernel_session, | |
2094 | channel_name); | |
2095 | if (ret != LTTCOMM_OK) { | |
2096 | goto error; | |
2097 | } | |
54d01ffb | 2098 | |
78f0bacd DG |
2099 | kernel_wait_quiescent(kernel_tracer_fd); |
2100 | break; | |
2101 | } | |
2102 | case LTTNG_DOMAIN_UST: | |
2103 | { | |
2104 | struct ltt_ust_channel *uchan; | |
2105 | ||
2106 | /* Get channel in global UST domain HT */ | |
2107 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2108 | channel_name); | |
2109 | if (uchan == NULL) { | |
2110 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2111 | goto error; |
78f0bacd DG |
2112 | } |
2113 | ||
2114 | ret = ust_app_disable_channel_all(usess, uchan); | |
2115 | if (ret < 0) { | |
2116 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
2117 | goto error; | |
2118 | } | |
2119 | ||
2120 | uchan->enabled = 0; | |
2121 | ||
2122 | break; | |
2123 | } | |
2124 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2125 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2126 | case LTTNG_DOMAIN_UST_PID: | |
2127 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2128 | goto error; | |
2129 | default: | |
2130 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2131 | goto error; | |
20fe2104 DG |
2132 | } |
2133 | ||
54d01ffb | 2134 | ret = LTTCOMM_OK; |
d65106b1 | 2135 | |
54d01ffb DG |
2136 | error: |
2137 | return ret; | |
2138 | } | |
2139 | ||
56fff090 DG |
2140 | /* |
2141 | * Copy channel from attributes and set it in the application channel list. | |
2142 | */ | |
f6a9efaa | 2143 | /* |
56fff090 DG |
2144 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2145 | struct lttng_channel *attr, struct ust_app *app) | |
2146 | { | |
2147 | int ret; | |
2148 | struct ltt_ust_channel *uchan, *new_chan; | |
2149 | ||
f6a9efaa | 2150 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2151 | if (uchan == NULL) { |
2152 | ret = LTTCOMM_FATAL; | |
2153 | goto error; | |
2154 | } | |
2155 | ||
2156 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2157 | if (new_chan == NULL) { | |
2158 | PERROR("malloc ltt_ust_channel"); | |
2159 | ret = LTTCOMM_FATAL; | |
2160 | goto error; | |
2161 | } | |
2162 | ||
2163 | ret = channel_ust_copy(new_chan, uchan); | |
2164 | if (ret < 0) { | |
2165 | ret = LTTCOMM_FATAL; | |
2166 | goto error; | |
2167 | } | |
2168 | ||
56fff090 DG |
2169 | error: |
2170 | return ret; | |
2171 | } | |
f6a9efaa | 2172 | */ |
56fff090 | 2173 | |
54d01ffb DG |
2174 | /* |
2175 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2176 | */ | |
44d3bd01 | 2177 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2178 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2179 | { |
2180 | int ret; | |
f6a9efaa DG |
2181 | struct ltt_ust_session *usess = session->ust_session; |
2182 | ||
5d56b5aa | 2183 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2184 | |
aea829b3 | 2185 | switch (domain) { |
44d3bd01 DG |
2186 | case LTTNG_DOMAIN_KERNEL: |
2187 | { | |
2188 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2189 | |
44d3bd01 DG |
2190 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2191 | session->kernel_session); | |
2192 | if (kchan == NULL) { | |
2193 | ret = channel_kernel_create(session->kernel_session, | |
2194 | attr, kernel_poll_pipe[1]); | |
2195 | } else { | |
2196 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2197 | } | |
2198 | ||
2199 | if (ret != LTTCOMM_OK) { | |
2200 | goto error; | |
2201 | } | |
2202 | ||
2203 | kernel_wait_quiescent(kernel_tracer_fd); | |
2204 | break; | |
2205 | } | |
f6a9efaa DG |
2206 | case LTTNG_DOMAIN_UST: |
2207 | { | |
2208 | struct ltt_ust_channel *uchan; | |
2209 | ||
48842b30 | 2210 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2211 | |
48842b30 | 2212 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2213 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2214 | attr->name); | |
2215 | if (uchan == NULL) { | |
48842b30 | 2216 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2217 | if (uchan == NULL) { |
2218 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2219 | goto error; | |
2220 | } | |
d5cd1f34 | 2221 | |
f6a9efaa DG |
2222 | rcu_read_lock(); |
2223 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2224 | rcu_read_unlock(); | |
48842b30 | 2225 | DBG2("UST channel %s added to global domain HT", attr->name); |
78f0bacd DG |
2226 | |
2227 | /* Add channel to all registered applications */ | |
2228 | ret = ust_app_create_channel_all(usess, uchan); | |
2229 | if (ret != 0) { | |
2230 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2231 | goto error; | |
2232 | } | |
f6a9efaa | 2233 | } else { |
78f0bacd DG |
2234 | /* If already enabled, everything is OK */ |
2235 | if (uchan->enabled) { | |
2236 | ret = LTTCOMM_OK; | |
2237 | goto error; | |
2238 | } | |
f6a9efaa | 2239 | |
78f0bacd DG |
2240 | ret = ust_app_enable_channel_all(usess, uchan); |
2241 | if (ret < 0) { | |
2242 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2243 | goto error; | |
2244 | } | |
48842b30 | 2245 | } |
f6a9efaa | 2246 | |
37357452 DG |
2247 | uchan->enabled = 1; |
2248 | ||
f6a9efaa DG |
2249 | break; |
2250 | } | |
78f0bacd DG |
2251 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2252 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2253 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2254 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2255 | goto error; | |
44d3bd01 DG |
2256 | default: |
2257 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2258 | goto error; | |
54d01ffb DG |
2259 | } |
2260 | ||
2261 | ret = LTTCOMM_OK; | |
2262 | ||
2263 | error: | |
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | /* | |
2268 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2269 | */ | |
2270 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2271 | char *channel_name, char *event_name) | |
2272 | { | |
2273 | int ret; | |
54d01ffb DG |
2274 | |
2275 | switch (domain) { | |
2276 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2277 | { |
2278 | struct ltt_kernel_channel *kchan; | |
2279 | ||
54d01ffb DG |
2280 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2281 | session->kernel_session); | |
2282 | if (kchan == NULL) { | |
2283 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2284 | goto error; | |
d65106b1 DG |
2285 | } |
2286 | ||
7a3d1328 | 2287 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2288 | if (ret != LTTCOMM_OK) { |
2289 | goto error; | |
2290 | } | |
2291 | ||
2292 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2293 | break; |
2bdd86d4 MD |
2294 | } |
2295 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2296 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2297 | case LTTNG_DOMAIN_UST_PID: | |
2298 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2299 | default: |
2bdd86d4 | 2300 | /* TODO: Other UST domains */ |
54d01ffb DG |
2301 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2302 | goto error; | |
d65106b1 | 2303 | } |
26cc6b4e | 2304 | |
54d01ffb DG |
2305 | ret = LTTCOMM_OK; |
2306 | ||
2307 | error: | |
2308 | return ret; | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2313 | */ | |
2314 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2315 | char *channel_name) | |
2316 | { | |
2317 | int ret; | |
54d01ffb DG |
2318 | |
2319 | switch (domain) { | |
2320 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2321 | { |
2322 | struct ltt_kernel_session *ksess; | |
2323 | struct ltt_kernel_channel *kchan; | |
2324 | ||
2325 | ksess = session->kernel_session; | |
2326 | ||
2327 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2328 | if (kchan == NULL) { |
2329 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2330 | goto error; | |
26cc6b4e DG |
2331 | } |
2332 | ||
9730260e | 2333 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2334 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2335 | goto error; |
26cc6b4e DG |
2336 | } |
2337 | ||
54d01ffb | 2338 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2339 | break; |
9730260e DG |
2340 | } |
2341 | case LTTNG_DOMAIN_UST: | |
2342 | { | |
2343 | struct ltt_ust_session *usess; | |
2344 | struct ltt_ust_channel *uchan; | |
2345 | ||
2346 | usess = session->ust_session; | |
2347 | ||
2348 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2349 | channel_name); | |
2350 | if (uchan == NULL) { | |
2351 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | ret = ust_app_disable_event_all(usess, uchan); | |
2356 | if (ret < 0) { | |
2357 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
2358 | goto error; | |
2359 | } | |
2360 | ||
2361 | DBG2("Disable all UST event in channel %s completed", channel_name); | |
2362 | ||
2363 | break; | |
2364 | } | |
2365 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2366 | case LTTNG_DOMAIN_UST_PID: | |
2367 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2368 | default: |
54d01ffb DG |
2369 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2370 | goto error; | |
26cc6b4e | 2371 | } |
e953ef25 | 2372 | |
54d01ffb | 2373 | ret = LTTCOMM_OK; |
e953ef25 | 2374 | |
54d01ffb DG |
2375 | error: |
2376 | return ret; | |
2377 | } | |
f5177a38 | 2378 | |
54d01ffb DG |
2379 | /* |
2380 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2381 | */ | |
2382 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2383 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2384 | { | |
2385 | int ret; | |
f5177a38 | 2386 | |
54d01ffb DG |
2387 | switch (domain) { |
2388 | case LTTNG_DOMAIN_KERNEL: | |
2389 | /* Add kernel context to kernel tracer */ | |
2390 | ret = context_kernel_add(session->kernel_session, ctx, | |
2391 | event_name, channel_name); | |
2392 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2393 | goto error; |
e953ef25 | 2394 | } |
2bdd86d4 MD |
2395 | break; |
2396 | case LTTNG_DOMAIN_UST: | |
2397 | { | |
48842b30 DG |
2398 | /* |
2399 | struct ltt_ust_session *usess; | |
e953ef25 | 2400 | |
48842b30 DG |
2401 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2402 | ret = context_ust_add(usess, ctx, | |
2403 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2404 | if (ret != LTTCOMM_OK) { |
2405 | goto error; | |
2406 | } | |
2407 | } | |
e953ef25 | 2408 | break; |
48842b30 | 2409 | */ |
2bdd86d4 | 2410 | } |
54d01ffb | 2411 | default: |
2bdd86d4 | 2412 | /* TODO: UST other domains */ |
54d01ffb DG |
2413 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2414 | goto error; | |
e953ef25 | 2415 | } |
950131af | 2416 | |
54d01ffb | 2417 | ret = LTTCOMM_OK; |
950131af | 2418 | |
54d01ffb DG |
2419 | error: |
2420 | return ret; | |
2421 | } | |
2422 | ||
2423 | /* | |
2424 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2425 | */ | |
2426 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2427 | char *channel_name, struct lttng_event *event) | |
2428 | { | |
2429 | int ret; | |
f6cd6b0f | 2430 | struct lttng_channel *attr; |
48842b30 | 2431 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2432 | |
2433 | switch (domain) { | |
2434 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2435 | { |
2436 | struct ltt_kernel_channel *kchan; | |
2437 | ||
54d01ffb DG |
2438 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2439 | session->kernel_session); | |
2440 | if (kchan == NULL) { | |
f6cd6b0f DG |
2441 | attr = channel_new_default_attr(domain); |
2442 | if (attr == NULL) { | |
2443 | ret = LTTCOMM_FATAL; | |
2444 | goto error; | |
2445 | } | |
2446 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2447 | ||
54d01ffb | 2448 | /* This call will notify the kernel thread */ |
44d3bd01 | 2449 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2450 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2451 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2452 | goto error; |
2453 | } | |
54d01ffb | 2454 | } |
950131af | 2455 | |
54d01ffb DG |
2456 | /* Get the newly created kernel channel pointer */ |
2457 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2458 | session->kernel_session); | |
2459 | if (kchan == NULL) { | |
2460 | /* This sould not happen... */ | |
2461 | ret = LTTCOMM_FATAL; | |
2462 | goto error; | |
2463 | } | |
f5177a38 | 2464 | |
48842b30 DG |
2465 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2466 | event); | |
54d01ffb | 2467 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2468 | goto error; |
950131af DG |
2469 | } |
2470 | ||
54d01ffb | 2471 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2472 | break; |
2bdd86d4 MD |
2473 | } |
2474 | case LTTNG_DOMAIN_UST: | |
2475 | { | |
48842b30 DG |
2476 | struct ltt_ust_channel *uchan; |
2477 | struct ltt_ust_event *uevent; | |
aea829b3 | 2478 | struct lttng_channel *attr; |
2bdd86d4 | 2479 | |
48842b30 DG |
2480 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2481 | channel_name); | |
2482 | if (uchan == NULL) { | |
aea829b3 DG |
2483 | /* Create default channel */ |
2484 | attr = channel_new_default_attr(domain); | |
2485 | if (attr == NULL) { | |
2486 | ret = LTTCOMM_FATAL; | |
2487 | goto error; | |
2488 | } | |
596219f7 | 2489 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
aea829b3 DG |
2490 | |
2491 | /* Use the internal command enable channel */ | |
2492 | ret = cmd_enable_channel(session, domain, attr); | |
2493 | if (ret < 0) { | |
2494 | goto error; | |
2495 | } | |
2496 | ||
2497 | free(attr); | |
2498 | ||
2499 | /* Get the newly created channel reference back */ | |
2500 | uchan = trace_ust_find_channel_by_name( | |
2501 | usess->domain_global.channels, channel_name); | |
2502 | if (uchan == NULL) { | |
2503 | /* Something is really wrong */ | |
2504 | ret = LTTCOMM_FATAL; | |
2505 | goto error; | |
2506 | } | |
48842b30 | 2507 | } |
2bdd86d4 | 2508 | |
48842b30 DG |
2509 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2510 | if (uevent == NULL) { | |
2511 | uevent = trace_ust_create_event(event); | |
2512 | if (uevent == NULL) { | |
2bdd86d4 MD |
2513 | ret = LTTCOMM_FATAL; |
2514 | goto error; | |
2515 | } | |
d5cd1f34 | 2516 | |
48842b30 | 2517 | } |
2bdd86d4 | 2518 | |
5b4a0ec0 | 2519 | ret = ust_app_create_event_all(usess, uchan, uevent); |
48842b30 DG |
2520 | if (ret < 0) { |
2521 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2522 | goto error; | |
2bdd86d4 | 2523 | } |
487cf67c | 2524 | |
d5cd1f34 | 2525 | /* Add ltt ust event to channel */ |
487cf67c DG |
2526 | rcu_read_lock(); |
2527 | hashtable_add_unique(uchan->events, &uevent->node); | |
2528 | rcu_read_unlock(); | |
d5cd1f34 | 2529 | |
37357452 DG |
2530 | uevent->enabled = 1; |
2531 | ||
d5cd1f34 DG |
2532 | DBG3("UST ltt event %s added to channel %s", uevent->attr.name, |
2533 | uchan->name); | |
2bdd86d4 MD |
2534 | break; |
2535 | } | |
2536 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2537 | case LTTNG_DOMAIN_UST_PID: | |
2538 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2539 | default: |
54d01ffb DG |
2540 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2541 | goto error; | |
950131af | 2542 | } |
d36b8583 | 2543 | |
54d01ffb | 2544 | ret = LTTCOMM_OK; |
d36b8583 | 2545 | |
54d01ffb DG |
2546 | error: |
2547 | return ret; | |
2548 | } | |
7d29a247 | 2549 | |
54d01ffb DG |
2550 | /* |
2551 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2552 | */ | |
2553 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2554 | char *channel_name, int event_type) |
54d01ffb DG |
2555 | { |
2556 | int ret; | |
2557 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2558 | |
54d01ffb DG |
2559 | switch (domain) { |
2560 | case LTTNG_DOMAIN_KERNEL: | |
2561 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2562 | session->kernel_session); | |
2563 | if (kchan == NULL) { | |
2564 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2565 | ret = channel_kernel_create(session->kernel_session, NULL, |
2566 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2567 | if (ret != LTTCOMM_OK) { |
2568 | goto error; | |
d36b8583 | 2569 | } |
54d01ffb | 2570 | } |
0d0c377a | 2571 | |
54d01ffb DG |
2572 | /* Get the newly created kernel channel pointer */ |
2573 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2574 | session->kernel_session); | |
2575 | if (kchan == NULL) { | |
2576 | /* This sould not happen... */ | |
2577 | ret = LTTCOMM_FATAL; | |
2578 | goto error; | |
2579 | } | |
0fdd1e2c | 2580 | |
7a3d1328 MD |
2581 | switch (event_type) { |
2582 | case LTTNG_KERNEL_SYSCALL: | |
2583 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2584 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2585 | break; |
2586 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2587 | /* |
7a3d1328 MD |
2588 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2589 | * events already registered to the channel. | |
8c9ae521 | 2590 | */ |
7a3d1328 MD |
2591 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2592 | kchan, kernel_tracer_fd); | |
2593 | break; | |
2594 | case LTTNG_KERNEL_ALL: | |
2595 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2596 | ret = event_kernel_enable_all(session->kernel_session, |
2597 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2598 | break; |
2599 | default: | |
2600 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2601 | goto error; | |
8c9ae521 | 2602 | } |
54d01ffb | 2603 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2604 | goto error; |
d36b8583 DG |
2605 | } |
2606 | ||
54d01ffb | 2607 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2608 | break; |
54d01ffb DG |
2609 | default: |
2610 | /* TODO: Userspace tracing */ | |
2611 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2612 | goto error; | |
d36b8583 | 2613 | } |
f3ed775e | 2614 | |
54d01ffb DG |
2615 | ret = LTTCOMM_OK; |
2616 | ||
2617 | error: | |
2618 | return ret; | |
2619 | } | |
2620 | ||
2621 | /* | |
2622 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2623 | */ | |
2624 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2625 | { | |
2626 | int ret; | |
2627 | ssize_t nb_events = 0; | |
2628 | ||
2629 | switch (domain) { | |
2630 | case LTTNG_DOMAIN_KERNEL: | |
2631 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2632 | if (nb_events < 0) { | |
2633 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2634 | goto error; | |
894be886 | 2635 | } |
54d01ffb | 2636 | break; |
b551a063 DG |
2637 | case LTTNG_DOMAIN_UST: |
2638 | nb_events = ust_app_list_events(events); | |
2639 | if (nb_events < 0) { | |
2640 | ret = LTTCOMM_UST_LIST_FAIL; | |
2641 | goto error; | |
2642 | } | |
2643 | break; | |
54d01ffb | 2644 | default: |
54d01ffb DG |
2645 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2646 | goto error; | |
2647 | } | |
894be886 | 2648 | |
54d01ffb | 2649 | return nb_events; |
7d29a247 | 2650 | |
54d01ffb DG |
2651 | error: |
2652 | /* Return negative value to differentiate return code */ | |
2653 | return -ret; | |
2654 | } | |
b389abbe | 2655 | |
54d01ffb DG |
2656 | /* |
2657 | * Command LTTNG_START_TRACE processed by the client thread. | |
2658 | */ | |
2659 | static int cmd_start_trace(struct ltt_session *session) | |
2660 | { | |
2661 | int ret; | |
54d01ffb | 2662 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2663 | struct ltt_ust_session *usess; |
b389abbe | 2664 | |
54d01ffb DG |
2665 | /* Short cut */ |
2666 | ksession = session->kernel_session; | |
b9d9b220 | 2667 | usess = session->ust_session; |
5eb91c98 | 2668 | |
464dd62d MD |
2669 | if (session->enabled) |
2670 | return LTTCOMM_UST_START_FAIL; | |
2671 | session->enabled = 1; | |
2672 | ||
54d01ffb DG |
2673 | /* Kernel tracing */ |
2674 | if (ksession != NULL) { | |
2bdd86d4 MD |
2675 | struct ltt_kernel_channel *kchan; |
2676 | ||
54d01ffb DG |
2677 | /* Open kernel metadata */ |
2678 | if (ksession->metadata == NULL) { | |
2679 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2680 | if (ret < 0) { | |
2681 | ret = LTTCOMM_KERN_META_FAIL; | |
2682 | goto error; | |
b389abbe | 2683 | } |
54d01ffb | 2684 | } |
7d29a247 | 2685 | |
54d01ffb DG |
2686 | /* Open kernel metadata stream */ |
2687 | if (ksession->metadata_stream_fd == 0) { | |
2688 | ret = kernel_open_metadata_stream(ksession); | |
2689 | if (ret < 0) { | |
2690 | ERR("Kernel create metadata stream failed"); | |
2691 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2692 | goto error; | |
2693 | } | |
2694 | } | |
2695 | ||
2696 | /* For each channel */ | |
2697 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2698 | if (kchan->stream_count == 0) { | |
2699 | ret = kernel_open_channel_stream(kchan); | |
2700 | if (ret < 0) { | |
2701 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2702 | goto error; |
2703 | } | |
54d01ffb DG |
2704 | /* Update the stream global counter */ |
2705 | ksession->stream_count_global += ret; | |
7d29a247 | 2706 | } |
54d01ffb DG |
2707 | } |
2708 | ||
2709 | /* Setup kernel consumer socket and send fds to it */ | |
2710 | ret = init_kernel_tracing(ksession); | |
2711 | if (ret < 0) { | |
2712 | ret = LTTCOMM_KERN_START_FAIL; | |
2713 | goto error; | |
2714 | } | |
2715 | ||
2716 | /* This start the kernel tracing */ | |
2717 | ret = kernel_start_session(ksession); | |
2718 | if (ret < 0) { | |
2719 | ret = LTTCOMM_KERN_START_FAIL; | |
2720 | goto error; | |
2721 | } | |
2722 | ||
2723 | /* Quiescent wait after starting trace */ | |
2724 | kernel_wait_quiescent(kernel_tracer_fd); | |
2725 | } | |
2726 | ||
36dc12cc | 2727 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2728 | if (usess) { |
2729 | usess->start_trace = 1; | |
36dc12cc | 2730 | |
b9d9b220 DG |
2731 | ret = ust_app_start_trace_all(usess); |
2732 | if (ret < 0) { | |
2733 | ret = LTTCOMM_UST_START_FAIL; | |
2734 | goto error; | |
2735 | } | |
2bdd86d4 | 2736 | } |
54d01ffb DG |
2737 | |
2738 | ret = LTTCOMM_OK; | |
2739 | ||
2740 | error: | |
2741 | return ret; | |
2742 | } | |
2743 | ||
2744 | /* | |
2745 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2746 | */ | |
2747 | static int cmd_stop_trace(struct ltt_session *session) | |
2748 | { | |
2749 | int ret; | |
2750 | struct ltt_kernel_channel *kchan; | |
2751 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2752 | struct ltt_ust_session *usess; |
54d01ffb DG |
2753 | |
2754 | /* Short cut */ | |
2755 | ksession = session->kernel_session; | |
8be98f9a | 2756 | usess = session->ust_session; |
54d01ffb | 2757 | |
464dd62d MD |
2758 | if (!session->enabled) |
2759 | return LTTCOMM_UST_START_FAIL; | |
2760 | session->enabled = 0; | |
2761 | ||
54d01ffb DG |
2762 | /* Kernel tracer */ |
2763 | if (ksession != NULL) { | |
2764 | DBG("Stop kernel tracing"); | |
2765 | ||
2766 | /* Flush all buffers before stopping */ | |
2767 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2768 | if (ret < 0) { | |
2769 | ERR("Kernel metadata flush failed"); | |
2770 | } | |
f34daff7 | 2771 | |
54d01ffb DG |
2772 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2773 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2774 | if (ret < 0) { |
54d01ffb | 2775 | ERR("Kernel flush buffer error"); |
7d29a247 | 2776 | } |
54d01ffb | 2777 | } |
19e70852 | 2778 | |
54d01ffb DG |
2779 | ret = kernel_stop_session(ksession); |
2780 | if (ret < 0) { | |
2781 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2782 | goto error; |
f3ed775e | 2783 | } |
54d01ffb DG |
2784 | |
2785 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2786 | } |
54d01ffb | 2787 | |
8be98f9a MD |
2788 | if (usess) { |
2789 | usess->start_trace = 0; | |
2bdd86d4 | 2790 | |
8be98f9a | 2791 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2792 | if (ret < 0) { |
8be98f9a | 2793 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2794 | goto error; |
2795 | } | |
2bdd86d4 | 2796 | } |
54d01ffb DG |
2797 | |
2798 | ret = LTTCOMM_OK; | |
2799 | ||
2800 | error: | |
2801 | return ret; | |
2802 | } | |
2803 | ||
2804 | /* | |
2805 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2806 | */ | |
2807 | static int cmd_create_session(char *name, char *path) | |
2808 | { | |
2809 | int ret; | |
2810 | ||
2811 | ret = session_create(name, path); | |
2812 | if (ret != LTTCOMM_OK) { | |
2813 | goto error; | |
2814 | } | |
2815 | ||
2816 | ret = LTTCOMM_OK; | |
2817 | ||
2818 | error: | |
2819 | return ret; | |
2820 | } | |
2821 | ||
2822 | /* | |
2823 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2824 | */ | |
2825 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2826 | { | |
2827 | int ret; | |
2828 | ||
2829 | /* Clean kernel session teardown */ | |
2830 | teardown_kernel_session(session); | |
84cd17c6 MD |
2831 | /* UST session teardown */ |
2832 | teardown_ust_session(session); | |
54d01ffb DG |
2833 | |
2834 | /* | |
2835 | * Must notify the kernel thread here to update it's poll setin order | |
2836 | * to remove the channel(s)' fd just destroyed. | |
2837 | */ | |
2838 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2839 | if (ret < 0) { | |
2840 | perror("write kernel poll pipe"); | |
2841 | } | |
2842 | ||
271933a4 | 2843 | ret = session_destroy(session); |
54d01ffb DG |
2844 | |
2845 | return ret; | |
2846 | } | |
2847 | ||
2848 | /* | |
2849 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2850 | */ | |
2851 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2852 | { | |
2853 | int ret; | |
2854 | ||
2855 | switch (domain) { | |
2856 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2857 | { |
54d01ffb | 2858 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2859 | |
54d01ffb DG |
2860 | kcalibrate.type = calibrate->type; |
2861 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2862 | if (ret < 0) { |
54d01ffb DG |
2863 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2864 | goto error; | |
33a2b854 | 2865 | } |
54d01ffb DG |
2866 | break; |
2867 | } | |
2868 | default: | |
2869 | /* TODO: Userspace tracing */ | |
2870 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2871 | goto error; | |
2872 | } | |
33a2b854 | 2873 | |
54d01ffb | 2874 | ret = LTTCOMM_OK; |
33a2b854 | 2875 | |
54d01ffb DG |
2876 | error: |
2877 | return ret; | |
2878 | } | |
7d29a247 | 2879 | |
54d01ffb DG |
2880 | /* |
2881 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2882 | */ | |
2883 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2884 | char *sock_path) | |
2885 | { | |
2886 | int ret, sock; | |
b389abbe | 2887 | |
54d01ffb DG |
2888 | switch (domain) { |
2889 | case LTTNG_DOMAIN_KERNEL: | |
2890 | /* Can't register a consumer if there is already one */ | |
2891 | if (session->kernel_session->consumer_fd != 0) { | |
2892 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2893 | goto error; | |
2894 | } | |
2895 | ||
2896 | sock = lttcomm_connect_unix_sock(sock_path); | |
2897 | if (sock < 0) { | |
2898 | ret = LTTCOMM_CONNECT_FAIL; | |
2899 | goto error; | |
2900 | } | |
2901 | ||
2902 | session->kernel_session->consumer_fd = sock; | |
2903 | break; | |
2904 | default: | |
2905 | /* TODO: Userspace tracing */ | |
2906 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2907 | goto error; | |
2908 | } | |
2909 | ||
2910 | ret = LTTCOMM_OK; | |
2911 | ||
2912 | error: | |
2913 | return ret; | |
2914 | } | |
2915 | ||
2916 | /* | |
2917 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2918 | */ | |
2919 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2920 | struct lttng_domain **domains) | |
2921 | { | |
b551a063 | 2922 | int ret, index = 0; |
54d01ffb DG |
2923 | ssize_t nb_dom = 0; |
2924 | ||
2925 | if (session->kernel_session != NULL) { | |
b551a063 | 2926 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2927 | nb_dom++; |
2928 | } | |
2929 | ||
b551a063 DG |
2930 | if (session->ust_session != NULL) { |
2931 | DBG3("Listing domains found UST global domain"); | |
2932 | nb_dom++; | |
2933 | } | |
54d01ffb | 2934 | |
b551a063 | 2935 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2936 | if (*domains == NULL) { |
2937 | ret = -LTTCOMM_FATAL; | |
2938 | goto error; | |
2939 | } | |
2940 | ||
b551a063 DG |
2941 | if (session->kernel_session != NULL) { |
2942 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2943 | index++; | |
2944 | } | |
2945 | ||
2946 | if (session->ust_session != NULL) { | |
2947 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2948 | index++; | |
2949 | } | |
54d01ffb | 2950 | |
54d01ffb DG |
2951 | return nb_dom; |
2952 | ||
2953 | error: | |
2954 | return ret; | |
2955 | } | |
2956 | ||
2957 | /* | |
2958 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2959 | */ | |
b551a063 | 2960 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2961 | struct lttng_channel **channels) |
2962 | { | |
2963 | int ret; | |
2964 | ssize_t nb_chan = 0; | |
2965 | ||
b551a063 DG |
2966 | switch (domain) { |
2967 | case LTTNG_DOMAIN_KERNEL: | |
2968 | if (session->kernel_session != NULL) { | |
2969 | nb_chan = session->kernel_session->channel_count; | |
2970 | } | |
0df502fd | 2971 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
2972 | break; |
2973 | case LTTNG_DOMAIN_UST: | |
2974 | if (session->ust_session != NULL) { | |
2975 | nb_chan = hashtable_get_count( | |
2976 | session->ust_session->domain_global.channels); | |
2977 | } | |
0df502fd | 2978 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
2979 | break; |
2980 | default: | |
2981 | *channels = NULL; | |
2982 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2983 | goto error; |
2984 | } | |
2985 | ||
b551a063 DG |
2986 | if (nb_chan > 0) { |
2987 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2988 | if (*channels == NULL) { | |
2989 | ret = -LTTCOMM_FATAL; | |
2990 | goto error; | |
2991 | } | |
54d01ffb | 2992 | |
b551a063 DG |
2993 | list_lttng_channels(domain, session, *channels); |
2994 | } else { | |
2995 | *channels = NULL; | |
2996 | } | |
2bdd86d4 | 2997 | |
54d01ffb DG |
2998 | return nb_chan; |
2999 | ||
3000 | error: | |
3001 | return ret; | |
3002 | } | |
3003 | ||
3004 | /* | |
3005 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3006 | */ | |
b551a063 | 3007 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3008 | char *channel_name, struct lttng_event **events) |
3009 | { | |
b551a063 | 3010 | int ret = 0; |
54d01ffb | 3011 | ssize_t nb_event = 0; |
54d01ffb | 3012 | |
b551a063 DG |
3013 | switch (domain) { |
3014 | case LTTNG_DOMAIN_KERNEL: | |
3015 | if (session->kernel_session != NULL) { | |
3016 | nb_event = list_lttng_kernel_events(channel_name, | |
3017 | session->kernel_session, events); | |
54d01ffb | 3018 | } |
b551a063 DG |
3019 | break; |
3020 | case LTTNG_DOMAIN_UST: | |
3021 | { | |
3022 | if (session->ust_session != NULL) { | |
3023 | nb_event = list_lttng_ust_global_events(channel_name, | |
3024 | &session->ust_session->domain_global, events); | |
3025 | } | |
3026 | break; | |
54d01ffb | 3027 | } |
b551a063 DG |
3028 | default: |
3029 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3030 | goto error; |
3031 | } | |
3032 | ||
b551a063 | 3033 | ret = nb_event; |
54d01ffb DG |
3034 | |
3035 | error: | |
3036 | return ret; | |
3037 | } | |
3038 | ||
3039 | /* | |
3040 | * Process the command requested by the lttng client within the command | |
3041 | * context structure. This function make sure that the return structure (llm) | |
3042 | * is set and ready for transmission before returning. | |
3043 | * | |
3044 | * Return any error encountered or 0 for success. | |
3045 | */ | |
3046 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3047 | { | |
3048 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3049 | int need_tracing_session = 1; |
54d01ffb DG |
3050 | |
3051 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3052 | ||
3053 | /* | |
3054 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3055 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3056 | * command. |
3057 | */ | |
3058 | switch(cmd_ctx->lsm->cmd_type) { | |
3059 | case LTTNG_LIST_SESSIONS: | |
3060 | case LTTNG_LIST_TRACEPOINTS: | |
3061 | case LTTNG_LIST_DOMAINS: | |
3062 | case LTTNG_LIST_CHANNELS: | |
3063 | case LTTNG_LIST_EVENTS: | |
3064 | break; | |
3065 | default: | |
3066 | /* Setup lttng message with no payload */ | |
3067 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3068 | if (ret < 0) { | |
3069 | /* This label does not try to unlock the session */ | |
3070 | goto init_setup_error; | |
3071 | } | |
3072 | } | |
3073 | ||
3074 | /* Commands that DO NOT need a session. */ | |
3075 | switch (cmd_ctx->lsm->cmd_type) { | |
3076 | case LTTNG_CALIBRATE: | |
3077 | case LTTNG_CREATE_SESSION: | |
3078 | case LTTNG_LIST_SESSIONS: | |
3079 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3080 | need_tracing_session = 0; |
54d01ffb DG |
3081 | break; |
3082 | default: | |
3083 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3084 | session_lock_list(); |
54d01ffb | 3085 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3086 | session_unlock_list(); |
54d01ffb DG |
3087 | if (cmd_ctx->session == NULL) { |
3088 | if (cmd_ctx->lsm->session.name != NULL) { | |
3089 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3090 | } else { | |
3091 | /* If no session name specified */ | |
3092 | ret = LTTCOMM_SELECT_SESS; | |
3093 | } | |
3094 | goto error; | |
3095 | } else { | |
3096 | /* Acquire lock for the session */ | |
3097 | session_lock(cmd_ctx->session); | |
3098 | } | |
3099 | break; | |
3100 | } | |
b389abbe | 3101 | |
54d01ffb DG |
3102 | /* |
3103 | * Check domain type for specific "pre-action". | |
3104 | */ | |
3105 | switch (cmd_ctx->lsm->domain.type) { | |
3106 | case LTTNG_DOMAIN_KERNEL: | |
3107 | /* Kernel tracer check */ | |
3108 | if (kernel_tracer_fd == 0) { | |
3109 | /* Basically, load kernel tracer modules */ | |
3110 | init_kernel_tracer(); | |
3111 | if (kernel_tracer_fd == 0) { | |
3112 | ret = LTTCOMM_KERN_NA; | |
3113 | goto error; | |
3114 | } | |
3115 | } | |
5eb91c98 | 3116 | |
54d01ffb | 3117 | /* Need a session for kernel command */ |
44d3bd01 | 3118 | if (need_tracing_session) { |
54d01ffb DG |
3119 | if (cmd_ctx->session->kernel_session == NULL) { |
3120 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3121 | if (ret < 0) { |
54d01ffb | 3122 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3123 | goto error; |
3124 | } | |
b389abbe | 3125 | } |
7d29a247 | 3126 | |
54d01ffb | 3127 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3128 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3129 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3130 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3131 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3132 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3133 | if (ret < 0) { |
54d01ffb DG |
3134 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3135 | goto error; | |
950131af | 3136 | } |
3ff2ecac MD |
3137 | } else { |
3138 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3139 | } |
0d0c377a | 3140 | } |
54d01ffb | 3141 | break; |
2bdd86d4 | 3142 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3143 | { |
44d3bd01 | 3144 | if (need_tracing_session) { |
f6a9efaa | 3145 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3146 | ret = create_ust_session(cmd_ctx->session, |
3147 | &cmd_ctx->lsm->domain); | |
3148 | if (ret != LTTCOMM_OK) { | |
3149 | goto error; | |
3150 | } | |
3151 | } | |
7753dea8 MD |
3152 | /* Start the UST consumer daemons */ |
3153 | /* 64-bit */ | |
3154 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
3155 | if (consumerd64_bindir[0] != '\0' && | |
3156 | ustconsumer64_data.pid == 0 && | |
2bdd86d4 | 3157 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3158 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3159 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3160 | if (ret < 0) { |
7753dea8 MD |
3161 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3162 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3163 | goto error; |
3164 | } | |
48842b30 | 3165 | |
7753dea8 | 3166 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3167 | } else { |
7753dea8 MD |
3168 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3169 | } | |
3170 | /* 32-bit */ | |
3171 | if (consumerd32_bindir[0] != '\0' && | |
3172 | ustconsumer32_data.pid == 0 && | |
3173 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3174 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3175 | ret = start_consumerd(&ustconsumer32_data); | |
3176 | if (ret < 0) { | |
3177 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3178 | ust_consumerd32_fd = -EINVAL; | |
3179 | goto error; | |
3180 | } | |
3181 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3182 | } else { | |
3183 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3184 | } |
44d3bd01 DG |
3185 | } |
3186 | break; | |
48842b30 | 3187 | } |
54d01ffb | 3188 | default: |
54d01ffb DG |
3189 | break; |
3190 | } | |
33a2b854 | 3191 | |
54d01ffb DG |
3192 | /* Process by command type */ |
3193 | switch (cmd_ctx->lsm->cmd_type) { | |
3194 | case LTTNG_ADD_CONTEXT: | |
3195 | { | |
3196 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3197 | cmd_ctx->lsm->u.context.channel_name, | |
3198 | cmd_ctx->lsm->u.context.event_name, | |
3199 | &cmd_ctx->lsm->u.context.ctx); | |
3200 | break; | |
3201 | } | |
3202 | case LTTNG_DISABLE_CHANNEL: | |
3203 | { | |
3204 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3205 | cmd_ctx->lsm->u.disable.channel_name); | |
3206 | break; | |
3207 | } | |
3208 | case LTTNG_DISABLE_EVENT: | |
3209 | { | |
3210 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3211 | cmd_ctx->lsm->u.disable.channel_name, | |
3212 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3213 | ret = LTTCOMM_OK; |
3214 | break; | |
3215 | } | |
54d01ffb DG |
3216 | case LTTNG_DISABLE_ALL_EVENT: |
3217 | { | |
2bdd86d4 | 3218 | DBG("Disabling all events"); |
54d01ffb DG |
3219 | |
3220 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3221 | cmd_ctx->lsm->u.disable.channel_name); | |
3222 | break; | |
3223 | } | |
3224 | case LTTNG_ENABLE_CHANNEL: | |
3225 | { | |
aea829b3 | 3226 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3227 | &cmd_ctx->lsm->u.channel.chan); |
3228 | break; | |
3229 | } | |
3230 | case LTTNG_ENABLE_EVENT: | |
3231 | { | |
3232 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3233 | cmd_ctx->lsm->u.enable.channel_name, | |
3234 | &cmd_ctx->lsm->u.enable.event); | |
3235 | break; | |
3236 | } | |
3237 | case LTTNG_ENABLE_ALL_EVENT: | |
3238 | { | |
2bdd86d4 | 3239 | DBG("Enabling all events"); |
54d01ffb DG |
3240 | |
3241 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3242 | cmd_ctx->lsm->u.enable.channel_name, |
3243 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3244 | break; |
3245 | } | |
052da939 | 3246 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3247 | { |
9f19cc17 | 3248 | struct lttng_event *events; |
54d01ffb | 3249 | ssize_t nb_events; |
052da939 | 3250 | |
54d01ffb DG |
3251 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3252 | if (nb_events < 0) { | |
3253 | ret = -nb_events; | |
3254 | goto error; | |
2ef84c95 DG |
3255 | } |
3256 | ||
3257 | /* | |
3258 | * Setup lttng message with payload size set to the event list size in | |
3259 | * bytes and then copy list into the llm payload. | |
3260 | */ | |
052da939 | 3261 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3262 | if (ret < 0) { |
052da939 | 3263 | free(events); |
2ef84c95 DG |
3264 | goto setup_error; |
3265 | } | |
3266 | ||
3267 | /* Copy event list into message payload */ | |
9f19cc17 | 3268 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3269 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3270 | |
9f19cc17 | 3271 | free(events); |
2ef84c95 DG |
3272 | |
3273 | ret = LTTCOMM_OK; | |
3274 | break; | |
3275 | } | |
f3ed775e | 3276 | case LTTNG_START_TRACE: |
8c0faa1d | 3277 | { |
54d01ffb | 3278 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3279 | break; |
3280 | } | |
f3ed775e | 3281 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3282 | { |
54d01ffb | 3283 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3284 | break; |
3285 | } | |
5e16da05 MD |
3286 | case LTTNG_CREATE_SESSION: |
3287 | { | |
54d01ffb DG |
3288 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3289 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3290 | break; |
3291 | } | |
3292 | case LTTNG_DESTROY_SESSION: | |
3293 | { | |
54d01ffb DG |
3294 | ret = cmd_destroy_session(cmd_ctx->session, |
3295 | cmd_ctx->lsm->session.name); | |
5461b305 | 3296 | break; |
5e16da05 | 3297 | } |
9f19cc17 | 3298 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3299 | { |
54d01ffb DG |
3300 | ssize_t nb_dom; |
3301 | struct lttng_domain *domains; | |
5461b305 | 3302 | |
54d01ffb DG |
3303 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3304 | if (nb_dom < 0) { | |
3305 | ret = -nb_dom; | |
3306 | goto error; | |
ce3d728c | 3307 | } |
520ff687 | 3308 | |
54d01ffb | 3309 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3310 | if (ret < 0) { |
3311 | goto setup_error; | |
520ff687 | 3312 | } |
57167058 | 3313 | |
54d01ffb DG |
3314 | /* Copy event list into message payload */ |
3315 | memcpy(cmd_ctx->llm->payload, domains, | |
3316 | nb_dom * sizeof(struct lttng_domain)); | |
3317 | ||
3318 | free(domains); | |
5e16da05 | 3319 | |
5461b305 | 3320 | ret = LTTCOMM_OK; |
5e16da05 MD |
3321 | break; |
3322 | } | |
9f19cc17 | 3323 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3324 | { |
54d01ffb DG |
3325 | size_t nb_chan; |
3326 | struct lttng_channel *channels; | |
3327 | ||
b551a063 DG |
3328 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3329 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3330 | if (nb_chan < 0) { |
3331 | ret = -nb_chan; | |
3332 | goto error; | |
5461b305 | 3333 | } |
ca95a216 | 3334 | |
54d01ffb | 3335 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3336 | if (ret < 0) { |
3337 | goto setup_error; | |
3338 | } | |
9f19cc17 | 3339 | |
54d01ffb DG |
3340 | /* Copy event list into message payload */ |
3341 | memcpy(cmd_ctx->llm->payload, channels, | |
3342 | nb_chan * sizeof(struct lttng_channel)); | |
3343 | ||
3344 | free(channels); | |
9f19cc17 DG |
3345 | |
3346 | ret = LTTCOMM_OK; | |
5461b305 | 3347 | break; |
5e16da05 | 3348 | } |
9f19cc17 | 3349 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3350 | { |
b551a063 | 3351 | ssize_t nb_event; |
684d34d2 | 3352 | struct lttng_event *events = NULL; |
9f19cc17 | 3353 | |
b551a063 | 3354 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3355 | cmd_ctx->lsm->u.list.channel_name, &events); |
3356 | if (nb_event < 0) { | |
3357 | ret = -nb_event; | |
3358 | goto error; | |
5461b305 | 3359 | } |
ca95a216 | 3360 | |
54d01ffb | 3361 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3362 | if (ret < 0) { |
3363 | goto setup_error; | |
3364 | } | |
9f19cc17 | 3365 | |
54d01ffb DG |
3366 | /* Copy event list into message payload */ |
3367 | memcpy(cmd_ctx->llm->payload, events, | |
3368 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3369 | |
54d01ffb | 3370 | free(events); |
9f19cc17 DG |
3371 | |
3372 | ret = LTTCOMM_OK; | |
5461b305 | 3373 | break; |
5e16da05 MD |
3374 | } |
3375 | case LTTNG_LIST_SESSIONS: | |
3376 | { | |
54d01ffb | 3377 | session_lock_list(); |
5461b305 | 3378 | |
6c9cc2ab | 3379 | if (session_list_ptr->count == 0) { |
f3ed775e | 3380 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3381 | session_unlock_list(); |
5461b305 | 3382 | goto error; |
57167058 | 3383 | } |
5e16da05 | 3384 | |
6c9cc2ab DG |
3385 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3386 | session_list_ptr->count); | |
5461b305 | 3387 | if (ret < 0) { |
54d01ffb | 3388 | session_unlock_list(); |
5461b305 | 3389 | goto setup_error; |
e065084a | 3390 | } |
5e16da05 | 3391 | |
6c9cc2ab DG |
3392 | /* Filled the session array */ |
3393 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3394 | ||
54d01ffb | 3395 | session_unlock_list(); |
5e16da05 | 3396 | |
5461b305 | 3397 | ret = LTTCOMM_OK; |
5e16da05 MD |
3398 | break; |
3399 | } | |
d0254c7c MD |
3400 | case LTTNG_CALIBRATE: |
3401 | { | |
54d01ffb DG |
3402 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3403 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3404 | break; |
3405 | } | |
d9800920 DG |
3406 | case LTTNG_REGISTER_CONSUMER: |
3407 | { | |
54d01ffb DG |
3408 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3409 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3410 | break; |
3411 | } | |
5e16da05 | 3412 | default: |
5e16da05 | 3413 | ret = LTTCOMM_UND; |
5461b305 | 3414 | break; |
fac6795d DG |
3415 | } |
3416 | ||
5461b305 | 3417 | error: |
5461b305 DG |
3418 | if (cmd_ctx->llm == NULL) { |
3419 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3420 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3421 | goto setup_error; |
3422 | } | |
3423 | } | |
54d01ffb | 3424 | /* Set return code */ |
5461b305 | 3425 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3426 | setup_error: |
b5541356 | 3427 | if (cmd_ctx->session) { |
54d01ffb | 3428 | session_unlock(cmd_ctx->session); |
b5541356 | 3429 | } |
54d01ffb | 3430 | init_setup_error: |
8028d920 | 3431 | return ret; |
fac6795d DG |
3432 | } |
3433 | ||
1d4b027a | 3434 | /* |
d063d709 DG |
3435 | * This thread manage all clients request using the unix client socket for |
3436 | * communication. | |
1d4b027a DG |
3437 | */ |
3438 | static void *thread_manage_clients(void *data) | |
3439 | { | |
5eb91c98 DG |
3440 | int sock = 0, ret, i, pollfd; |
3441 | uint32_t revents, nb_fd; | |
273ea72c | 3442 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3443 | struct lttng_poll_event events; |
1d4b027a DG |
3444 | |
3445 | DBG("[thread] Manage client started"); | |
3446 | ||
f6a9efaa DG |
3447 | rcu_register_thread(); |
3448 | ||
1d4b027a DG |
3449 | ret = lttcomm_listen_unix_sock(client_sock); |
3450 | if (ret < 0) { | |
3451 | goto error; | |
3452 | } | |
3453 | ||
5eb91c98 DG |
3454 | /* |
3455 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3456 | * more will be added to this poll set. | |
3457 | */ | |
3458 | ret = create_thread_poll_set(&events, 2); | |
3459 | if (ret < 0) { | |
3460 | goto error; | |
3461 | } | |
273ea72c | 3462 | |
5eb91c98 DG |
3463 | /* Add the application registration socket */ |
3464 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3465 | if (ret < 0) { | |
3466 | goto error; | |
3467 | } | |
273ea72c | 3468 | |
bbd973c2 DG |
3469 | /* |
3470 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3471 | */ |
3472 | if (opt_sig_parent) { | |
3473 | kill(ppid, SIGCHLD); | |
3474 | } | |
3475 | ||
3476 | while (1) { | |
1d4b027a | 3477 | DBG("Accepting client command ..."); |
273ea72c | 3478 | |
5eb91c98 DG |
3479 | nb_fd = LTTNG_POLL_GETNB(&events); |
3480 | ||
273ea72c | 3481 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3482 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3483 | if (ret < 0) { |
273ea72c DG |
3484 | goto error; |
3485 | } | |
3486 | ||
5eb91c98 DG |
3487 | for (i = 0; i < nb_fd; i++) { |
3488 | /* Fetch once the poll data */ | |
3489 | revents = LTTNG_POLL_GETEV(&events, i); | |
3490 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3491 | ||
3492 | /* Thread quit pipe has been closed. Killing thread. */ | |
3493 | ret = check_thread_quit_pipe(pollfd, revents); | |
3494 | if (ret) { | |
3495 | goto error; | |
3496 | } | |
3497 | ||
3498 | /* Event on the registration socket */ | |
3499 | if (pollfd == client_sock) { | |
3500 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3501 | ERR("Client socket poll error"); | |
3502 | goto error; | |
3503 | } | |
3504 | } | |
3505 | } | |
3506 | ||
3507 | DBG("Wait for client response"); | |
3508 | ||
3509 | sock = lttcomm_accept_unix_sock(client_sock); | |
3510 | if (sock < 0) { | |
273ea72c | 3511 | goto error; |
273ea72c DG |
3512 | } |
3513 | ||
5eb91c98 | 3514 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3515 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3516 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3517 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3518 | goto error; |
5eb91c98 | 3519 | } |
1d4b027a | 3520 | |
5eb91c98 | 3521 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3522 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3523 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3524 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3525 | goto error; |
3526 | } | |
1d4b027a | 3527 | |
5eb91c98 DG |
3528 | cmd_ctx->llm = NULL; |
3529 | cmd_ctx->session = NULL; | |
1d4b027a | 3530 | |
5eb91c98 DG |
3531 | /* |
3532 | * Data is received from the lttng client. The struct | |
3533 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3534 | * the client. | |
3535 | */ | |
3536 | DBG("Receiving data from client ..."); | |
3537 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3538 | sizeof(struct lttcomm_session_msg)); | |
3539 | if (ret <= 0) { | |
3540 | DBG("Nothing recv() from client... continuing"); | |
3541 | close(sock); | |
3542 | free(cmd_ctx); | |
3543 | continue; | |
3544 | } | |
1d4b027a | 3545 | |
5eb91c98 DG |
3546 | // TODO: Validate cmd_ctx including sanity check for |
3547 | // security purpose. | |
f7776ea7 | 3548 | |
f6a9efaa | 3549 | rcu_thread_online(); |
5eb91c98 DG |
3550 | /* |
3551 | * This function dispatch the work to the kernel or userspace tracer | |
3552 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3553 | * informations for the client. The command context struct contains | |
3554 | * everything this function may needs. | |
3555 | */ | |
3556 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3557 | rcu_thread_offline(); |
5eb91c98 | 3558 | if (ret < 0) { |
bbd973c2 | 3559 | /* |
5eb91c98 | 3560 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3561 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3562 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3563 | */ |
bbd973c2 | 3564 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3565 | continue; |
3566 | } | |
d6e4fca4 | 3567 | |
54d01ffb DG |
3568 | DBG("Sending response (size: %d, retcode: %s)", |
3569 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3570 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3571 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3572 | if (ret < 0) { |
3573 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3574 | } |
1d4b027a | 3575 | |
5eb91c98 DG |
3576 | clean_command_ctx(&cmd_ctx); |
3577 | ||
3578 | /* End of transmission */ | |
273ea72c DG |
3579 | close(sock); |
3580 | } | |
3581 | ||
5eb91c98 DG |
3582 | error: |
3583 | DBG("Client thread dying"); | |
273ea72c | 3584 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3585 | close(client_sock); |
3586 | close(sock); | |
273ea72c | 3587 | |
5eb91c98 | 3588 | lttng_poll_clean(&events); |
a2fb29a5 | 3589 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3590 | |
3591 | rcu_unregister_thread(); | |
1d4b027a DG |
3592 | return NULL; |
3593 | } | |
3594 | ||
3595 | ||
fac6795d DG |
3596 | /* |
3597 | * usage function on stderr | |
3598 | */ | |
3599 | static void usage(void) | |
3600 | { | |
b716ce68 | 3601 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3602 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3603 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3604 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3605 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3606 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3607 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3608 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3609 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3610 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
3611 | fprintf(stderr, " --ustconsumerd32 PATH Specify path for the 32-bit UST consumer daemon binary\n"); | |
3612 | fprintf(stderr, " --ustconsumerd64 PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
d6f42150 DG |
3613 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3614 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3615 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3616 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3617 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3618 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3619 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3620 | } |
3621 | ||
3622 | /* | |
3623 | * daemon argument parsing | |
3624 | */ | |
3625 | static int parse_args(int argc, char **argv) | |
3626 | { | |
3627 | int c; | |
3628 | ||
3629 | static struct option long_options[] = { | |
3630 | { "client-sock", 1, 0, 'c' }, | |
3631 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3632 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3633 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3634 | { "ustconsumerd64", 1, 0, 't' }, |
3635 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
3636 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3637 | { "ustconsumerd32", 1, 0, 'u' }, | |
3638 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
3639 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
fac6795d | 3640 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3641 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3642 | { "help", 0, 0, 'h' }, |
3643 | { "group", 1, 0, 'g' }, | |
3644 | { "version", 0, 0, 'V' }, | |
75462a81 | 3645 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3646 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3647 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3648 | { NULL, 0, 0, 0 } |
3649 | }; | |
3650 | ||
3651 | while (1) { | |
3652 | int option_index = 0; | |
7753dea8 | 3653 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3654 | long_options, &option_index); |
fac6795d DG |
3655 | if (c == -1) { |
3656 | break; | |
3657 | } | |
3658 | ||
3659 | switch (c) { | |
3660 | case 0: | |
3661 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3662 | if (optarg) { | |
3663 | fprintf(stderr, " with arg %s\n", optarg); | |
3664 | } | |
3665 | break; | |
b716ce68 | 3666 | case 'c': |
fac6795d DG |
3667 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3668 | break; | |
3669 | case 'a': | |
3670 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3671 | break; | |
3672 | case 'd': | |
3673 | opt_daemon = 1; | |
3674 | break; | |
3675 | case 'g': | |
fb09408a | 3676 | opt_tracing_group = optarg; |
fac6795d DG |
3677 | break; |
3678 | case 'h': | |
3679 | usage(); | |
3680 | exit(EXIT_FAILURE); | |
3681 | case 'V': | |
3682 | fprintf(stdout, "%s\n", VERSION); | |
3683 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3684 | case 'S': |
3685 | opt_sig_parent = 1; | |
3686 | break; | |
d6f42150 | 3687 | case 'E': |
3bd1e081 | 3688 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3689 | break; |
3690 | case 'C': | |
3bd1e081 MD |
3691 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3692 | break; | |
3693 | case 'F': | |
7753dea8 | 3694 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3695 | break; |
3696 | case 'D': | |
7753dea8 MD |
3697 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3698 | break; | |
3699 | case 'H': | |
3700 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3701 | break; | |
3702 | case 'G': | |
3703 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3704 | break; |
75462a81 DG |
3705 | case 'q': |
3706 | opt_quiet = 1; | |
3707 | break; | |
3f9947db | 3708 | case 'v': |
53086306 DG |
3709 | /* Verbose level can increase using multiple -v */ |
3710 | opt_verbose += 1; | |
3f9947db | 3711 | break; |
31f73cc9 | 3712 | case 'Z': |
3bd1e081 | 3713 | opt_verbose_consumer += 1; |
31f73cc9 | 3714 | break; |
fb09408a | 3715 | case 'u': |
7753dea8 MD |
3716 | consumerd32_bindir = optarg; |
3717 | break; | |
3718 | case 't': | |
3719 | consumerd64_bindir = optarg; | |
fb09408a | 3720 | break; |
fac6795d DG |
3721 | default: |
3722 | /* Unknown option or other error. | |
3723 | * Error is printed by getopt, just return */ | |
3724 | return -1; | |
3725 | } | |
3726 | } | |
3727 | ||
3728 | return 0; | |
3729 | } | |
3730 | ||
3731 | /* | |
d063d709 | 3732 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3733 | * apps_sock - The communication socket for all UST apps. |
3734 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3735 | */ |
cf3af59e | 3736 | static int init_daemon_socket(void) |
fac6795d DG |
3737 | { |
3738 | int ret = 0; | |
3739 | mode_t old_umask; | |
3740 | ||
3741 | old_umask = umask(0); | |
3742 | ||
3743 | /* Create client tool unix socket */ | |
d6f42150 DG |
3744 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3745 | if (client_sock < 0) { | |
3746 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3747 | ret = -1; |
3748 | goto end; | |
3749 | } | |
3750 | ||
3751 | /* File permission MUST be 660 */ | |
3752 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3753 | if (ret < 0) { | |
d6f42150 | 3754 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3755 | perror("chmod"); |
3756 | goto end; | |
3757 | } | |
3758 | ||
3759 | /* Create the application unix socket */ | |
d6f42150 DG |
3760 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3761 | if (apps_sock < 0) { | |
3762 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3763 | ret = -1; |
3764 | goto end; | |
3765 | } | |
3766 | ||
d6f42150 | 3767 | /* File permission MUST be 666 */ |
54d01ffb DG |
3768 | ret = chmod(apps_unix_sock_path, |
3769 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3770 | if (ret < 0) { |
d6f42150 | 3771 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3772 | perror("chmod"); |
3773 | goto end; | |
3774 | } | |
3775 | ||
3776 | end: | |
3777 | umask(old_umask); | |
3778 | return ret; | |
3779 | } | |
3780 | ||
3781 | /* | |
54d01ffb DG |
3782 | * Check if the global socket is available, and if a daemon is answering at the |
3783 | * other side. If yes, error is returned. | |
fac6795d | 3784 | */ |
cf3af59e | 3785 | static int check_existing_daemon(void) |
fac6795d | 3786 | { |
7d8234d9 | 3787 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3788 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3789 | return 0; |
099e26bd | 3790 | } |
54d01ffb | 3791 | |
7d8234d9 | 3792 | /* Is there anybody out there ? */ |
099e26bd | 3793 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3794 | return -EEXIST; |
099e26bd | 3795 | } else { |
7d8234d9 | 3796 | return 0; |
099e26bd | 3797 | } |
fac6795d DG |
3798 | } |
3799 | ||
fac6795d | 3800 | /* |
d063d709 | 3801 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3802 | * |
d063d709 DG |
3803 | * Race window between mkdir and chown is OK because we are going from more |
3804 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3805 | */ |
d6f42150 | 3806 | static int set_permissions(void) |
fac6795d DG |
3807 | { |
3808 | int ret; | |
996b65c8 | 3809 | gid_t gid; |
fac6795d | 3810 | |
996b65c8 MD |
3811 | gid = allowed_group(); |
3812 | if (gid < 0) { | |
a463f419 DG |
3813 | if (is_root) { |
3814 | WARN("No tracing group detected"); | |
3815 | ret = 0; | |
3816 | } else { | |
3817 | ERR("Missing tracing group. Aborting execution."); | |
3818 | ret = -1; | |
3819 | } | |
fac6795d DG |
3820 | goto end; |
3821 | } | |
3822 | ||
d6f42150 | 3823 | /* Set lttng run dir */ |
996b65c8 | 3824 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3825 | if (ret < 0) { |
3826 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3827 | perror("chown"); | |
3828 | } | |
3829 | ||
3830 | /* lttng client socket path */ | |
996b65c8 | 3831 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3832 | if (ret < 0) { |
d6f42150 DG |
3833 | ERR("Unable to set group on %s", client_unix_sock_path); |
3834 | perror("chown"); | |
3835 | } | |
3836 | ||
3bd1e081 MD |
3837 | /* kconsumer error socket path */ |
3838 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3839 | if (ret < 0) { |
3bd1e081 MD |
3840 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3841 | perror("chown"); | |
3842 | } | |
3843 | ||
7753dea8 MD |
3844 | /* 64-bit ustconsumer error socket path */ |
3845 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3846 | if (ret < 0) { | |
3847 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
3848 | perror("chown"); | |
3849 | } | |
3850 | ||
3851 | /* 32-bit ustconsumer compat32 error socket path */ | |
3852 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3853 | if (ret < 0) { |
7753dea8 | 3854 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
3855 | perror("chown"); |
3856 | } | |
3857 | ||
d6f42150 | 3858 | DBG("All permissions are set"); |
e07ae692 | 3859 | |
fac6795d DG |
3860 | end: |
3861 | return ret; | |
3862 | } | |
3863 | ||
7a485870 | 3864 | /* |
d063d709 | 3865 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3866 | */ |
3867 | static int create_kernel_poll_pipe(void) | |
3868 | { | |
3869 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3870 | } | |
3871 | ||
099e26bd DG |
3872 | /* |
3873 | * Create the application command pipe to wake thread_manage_apps. | |
3874 | */ | |
3875 | static int create_apps_cmd_pipe(void) | |
3876 | { | |
3877 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3878 | } | |
3879 | ||
d6f42150 | 3880 | /* |
d063d709 | 3881 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3882 | */ |
3883 | static int create_lttng_rundir(void) | |
3884 | { | |
3885 | int ret; | |
3886 | ||
3887 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3888 | if (ret < 0) { | |
b1f11e69 DG |
3889 | if (errno != EEXIST) { |
3890 | ERR("Unable to create " LTTNG_RUNDIR); | |
3891 | goto error; | |
3892 | } else { | |
3893 | ret = 0; | |
3894 | } | |
d6f42150 DG |
3895 | } |
3896 | ||
3897 | error: | |
3898 | return ret; | |
3899 | } | |
3900 | ||
3901 | /* | |
d063d709 DG |
3902 | * Setup sockets and directory needed by the kconsumerd communication with the |
3903 | * session daemon. | |
d6f42150 | 3904 | */ |
3bd1e081 | 3905 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3906 | { |
3907 | int ret; | |
7753dea8 | 3908 | const char *path; |
d6f42150 | 3909 | |
7753dea8 MD |
3910 | switch (consumer_data->type) { |
3911 | case LTTNG_CONSUMER_KERNEL: | |
3912 | path = KCONSUMERD_PATH; | |
3913 | break; | |
3914 | case LTTNG_CONSUMER64_UST: | |
3915 | path = USTCONSUMERD64_PATH; | |
3916 | break; | |
3917 | case LTTNG_CONSUMER32_UST: | |
3918 | path = USTCONSUMERD32_PATH; | |
3919 | break; | |
3920 | default: | |
3921 | ERR("Consumer type unknown"); | |
3922 | ret = -EINVAL; | |
3923 | goto error; | |
d6f42150 DG |
3924 | } |
3925 | ||
3bd1e081 | 3926 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3927 | if (ret < 0) { |
6beb2242 | 3928 | if (errno != EEXIST) { |
3bd1e081 | 3929 | ERR("Failed to create %s", path); |
6beb2242 DG |
3930 | goto error; |
3931 | } | |
3932 | ret = 0; | |
d6f42150 DG |
3933 | } |
3934 | ||
3935 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3936 | consumer_data->err_sock = |
3937 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3938 | if (consumer_data->err_sock < 0) { | |
3939 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3940 | ret = -1; |
3941 | goto error; | |
3942 | } | |
3943 | ||
3944 | /* File permission MUST be 660 */ | |
3bd1e081 | 3945 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3946 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3947 | if (ret < 0) { |
3bd1e081 | 3948 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3949 | perror("chmod"); |
3950 | goto error; | |
3951 | } | |
3952 | ||
3953 | error: | |
3954 | return ret; | |
3955 | } | |
3956 | ||
fac6795d | 3957 | /* |
d063d709 | 3958 | * Signal handler for the daemon |
cf3af59e | 3959 | * |
54d01ffb DG |
3960 | * Simply stop all worker threads, leaving main() return gracefully after |
3961 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3962 | */ |
3963 | static void sighandler(int sig) | |
3964 | { | |
3965 | switch (sig) { | |
cf3af59e MD |
3966 | case SIGPIPE: |
3967 | DBG("SIGPIPE catched"); | |
3968 | return; | |
3969 | case SIGINT: | |
3970 | DBG("SIGINT catched"); | |
3971 | stop_threads(); | |
3972 | break; | |
3973 | case SIGTERM: | |
3974 | DBG("SIGTERM catched"); | |
3975 | stop_threads(); | |
3976 | break; | |
3977 | default: | |
3978 | break; | |
fac6795d | 3979 | } |
fac6795d DG |
3980 | } |
3981 | ||
3982 | /* | |
d063d709 | 3983 | * Setup signal handler for : |
1d4b027a | 3984 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3985 | */ |
1d4b027a | 3986 | static int set_signal_handler(void) |
fac6795d | 3987 | { |
1d4b027a DG |
3988 | int ret = 0; |
3989 | struct sigaction sa; | |
3990 | sigset_t sigset; | |
fac6795d | 3991 | |
1d4b027a DG |
3992 | if ((ret = sigemptyset(&sigset)) < 0) { |
3993 | perror("sigemptyset"); | |
3994 | return ret; | |
3995 | } | |
d6f42150 | 3996 | |
1d4b027a DG |
3997 | sa.sa_handler = sighandler; |
3998 | sa.sa_mask = sigset; | |
3999 | sa.sa_flags = 0; | |
4000 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4001 | perror("sigaction"); | |
4002 | return ret; | |
d6f42150 DG |
4003 | } |
4004 | ||
1d4b027a DG |
4005 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4006 | perror("sigaction"); | |
4007 | return ret; | |
d6f42150 | 4008 | } |
aaf26714 | 4009 | |
1d4b027a DG |
4010 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4011 | perror("sigaction"); | |
4012 | return ret; | |
8c0faa1d DG |
4013 | } |
4014 | ||
1d4b027a DG |
4015 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4016 | ||
4017 | return ret; | |
fac6795d DG |
4018 | } |
4019 | ||
f3ed775e | 4020 | /* |
d063d709 DG |
4021 | * Set open files limit to unlimited. This daemon can open a large number of |
4022 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4023 | */ |
4024 | static void set_ulimit(void) | |
4025 | { | |
4026 | int ret; | |
4027 | struct rlimit lim; | |
4028 | ||
a88df331 | 4029 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4030 | lim.rlim_cur = 65535; |
4031 | lim.rlim_max = 65535; | |
4032 | ||
4033 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4034 | if (ret < 0) { | |
4035 | perror("failed to set open files limit"); | |
4036 | } | |
4037 | } | |
4038 | ||
fac6795d DG |
4039 | /* |
4040 | * main | |
4041 | */ | |
4042 | int main(int argc, char **argv) | |
4043 | { | |
fac6795d DG |
4044 | int ret = 0; |
4045 | void *status; | |
b082db07 | 4046 | const char *home_path; |
fac6795d | 4047 | |
f6a9efaa DG |
4048 | rcu_register_thread(); |
4049 | ||
273ea72c | 4050 | /* Create thread quit pipe */ |
cf3af59e MD |
4051 | if ((ret = init_thread_quit_pipe()) < 0) { |
4052 | goto error; | |
273ea72c DG |
4053 | } |
4054 | ||
7753dea8 | 4055 | setup_consumerd_path(); |
fb09408a | 4056 | |
fac6795d DG |
4057 | /* Parse arguments */ |
4058 | progname = argv[0]; | |
4059 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4060 | goto error; |
fac6795d DG |
4061 | } |
4062 | ||
4063 | /* Daemonize */ | |
4064 | if (opt_daemon) { | |
53094c05 DG |
4065 | ret = daemon(0, 0); |
4066 | if (ret < 0) { | |
4067 | perror("daemon"); | |
cf3af59e | 4068 | goto error; |
53094c05 | 4069 | } |
fac6795d DG |
4070 | } |
4071 | ||
4072 | /* Check if daemon is UID = 0 */ | |
4073 | is_root = !getuid(); | |
4074 | ||
fac6795d | 4075 | if (is_root) { |
d6f42150 DG |
4076 | ret = create_lttng_rundir(); |
4077 | if (ret < 0) { | |
cf3af59e | 4078 | goto error; |
d6f42150 DG |
4079 | } |
4080 | ||
fac6795d | 4081 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4082 | snprintf(apps_unix_sock_path, PATH_MAX, |
4083 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4084 | } |
4085 | ||
4086 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4087 | snprintf(client_unix_sock_path, PATH_MAX, |
4088 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4089 | } | |
0fdd1e2c DG |
4090 | |
4091 | /* Set global SHM for ust */ | |
4092 | if (strlen(wait_shm_path) == 0) { | |
4093 | snprintf(wait_shm_path, PATH_MAX, | |
4094 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4095 | } | |
fac6795d | 4096 | } else { |
b082db07 DG |
4097 | home_path = get_home_dir(); |
4098 | if (home_path == NULL) { | |
273ea72c DG |
4099 | /* TODO: Add --socket PATH option */ |
4100 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4101 | ret = -EPERM; |
4102 | goto error; | |
b082db07 DG |
4103 | } |
4104 | ||
fac6795d | 4105 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4106 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4107 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4108 | } |
4109 | ||
4110 | /* Set the cli tool unix socket path */ | |
4111 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4112 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4113 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4114 | } |
0fdd1e2c DG |
4115 | |
4116 | /* Set global SHM for ust */ | |
4117 | if (strlen(wait_shm_path) == 0) { | |
4118 | snprintf(wait_shm_path, PATH_MAX, | |
4119 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4120 | } | |
fac6795d DG |
4121 | } |
4122 | ||
847177cd DG |
4123 | DBG("Client socket path %s", client_unix_sock_path); |
4124 | DBG("Application socket path %s", apps_unix_sock_path); | |
4125 | ||
273ea72c | 4126 | /* |
7d8234d9 | 4127 | * See if daemon already exist. |
fac6795d | 4128 | */ |
7d8234d9 | 4129 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4130 | ERR("Already running daemon.\n"); |
273ea72c | 4131 | /* |
cf3af59e MD |
4132 | * We do not goto exit because we must not cleanup() |
4133 | * because a daemon is already running. | |
ab118b20 | 4134 | */ |
cf3af59e | 4135 | goto error; |
a88df331 DG |
4136 | } |
4137 | ||
54d01ffb | 4138 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4139 | |
4140 | /* | |
4141 | * These actions must be executed as root. We do that *after* setting up | |
4142 | * the sockets path because we MUST make the check for another daemon using | |
4143 | * those paths *before* trying to set the kernel consumer sockets and init | |
4144 | * kernel tracer. | |
4145 | */ | |
4146 | if (is_root) { | |
3bd1e081 MD |
4147 | ret = set_consumer_sockets(&kconsumer_data); |
4148 | if (ret < 0) { | |
4149 | goto exit; | |
4150 | } | |
48842b30 | 4151 | |
7753dea8 | 4152 | ret = set_consumer_sockets(&ustconsumer64_data); |
a88df331 | 4153 | if (ret < 0) { |
cf3af59e | 4154 | goto exit; |
a88df331 | 4155 | } |
7753dea8 MD |
4156 | |
4157 | ret = set_consumer_sockets(&ustconsumer32_data); | |
4158 | if (ret < 0) { | |
4159 | goto exit; | |
4160 | } | |
4161 | ||
a88df331 DG |
4162 | /* Setup kernel tracer */ |
4163 | init_kernel_tracer(); | |
4164 | ||
4165 | /* Set ulimit for open files */ | |
4166 | set_ulimit(); | |
fac6795d DG |
4167 | } |
4168 | ||
cf3af59e MD |
4169 | if ((ret = set_signal_handler()) < 0) { |
4170 | goto exit; | |
fac6795d DG |
4171 | } |
4172 | ||
d6f42150 | 4173 | /* Setup the needed unix socket */ |
cf3af59e MD |
4174 | if ((ret = init_daemon_socket()) < 0) { |
4175 | goto exit; | |
fac6795d DG |
4176 | } |
4177 | ||
4178 | /* Set credentials to socket */ | |
cf3af59e MD |
4179 | if (is_root && ((ret = set_permissions()) < 0)) { |
4180 | goto exit; | |
fac6795d DG |
4181 | } |
4182 | ||
5b8719f5 DG |
4183 | /* Get parent pid if -S, --sig-parent is specified. */ |
4184 | if (opt_sig_parent) { | |
4185 | ppid = getppid(); | |
4186 | } | |
4187 | ||
7a485870 | 4188 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4189 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4190 | goto exit; | |
7a485870 DG |
4191 | } |
4192 | ||
099e26bd DG |
4193 | /* Setup the thread apps communication pipe. */ |
4194 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4195 | goto exit; | |
4196 | } | |
4197 | ||
4198 | /* Init UST command queue. */ | |
4199 | cds_wfq_init(&ust_cmd_queue.queue); | |
4200 | ||
f6a9efaa DG |
4201 | /* Init UST app hash table */ |
4202 | ust_app_ht_alloc(); | |
4203 | ||
273ea72c | 4204 | /* |
54d01ffb DG |
4205 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4206 | * statically declared in session.c | |
273ea72c | 4207 | */ |
54d01ffb | 4208 | session_list_ptr = session_get_list(); |
b5541356 | 4209 | |
5eb91c98 DG |
4210 | /* Set up max poll set size */ |
4211 | lttng_poll_set_max_size(); | |
4212 | ||
cf3af59e | 4213 | /* Create thread to manage the client socket */ |
099e26bd DG |
4214 | ret = pthread_create(&client_thread, NULL, |
4215 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4216 | if (ret != 0) { |
099e26bd | 4217 | perror("pthread_create clients"); |
cf3af59e MD |
4218 | goto exit_client; |
4219 | } | |
fac6795d | 4220 | |
099e26bd DG |
4221 | /* Create thread to dispatch registration */ |
4222 | ret = pthread_create(&dispatch_thread, NULL, | |
4223 | thread_dispatch_ust_registration, (void *) NULL); | |
4224 | if (ret != 0) { | |
4225 | perror("pthread_create dispatch"); | |
4226 | goto exit_dispatch; | |
4227 | } | |
4228 | ||
4229 | /* Create thread to manage application registration. */ | |
4230 | ret = pthread_create(®_apps_thread, NULL, | |
4231 | thread_registration_apps, (void *) NULL); | |
4232 | if (ret != 0) { | |
4233 | perror("pthread_create registration"); | |
4234 | goto exit_reg_apps; | |
4235 | } | |
4236 | ||
cf3af59e | 4237 | /* Create thread to manage application socket */ |
54d01ffb DG |
4238 | ret = pthread_create(&apps_thread, NULL, |
4239 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4240 | if (ret != 0) { |
099e26bd | 4241 | perror("pthread_create apps"); |
cf3af59e MD |
4242 | goto exit_apps; |
4243 | } | |
fac6795d | 4244 | |
cf3af59e | 4245 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4246 | ret = pthread_create(&kernel_thread, NULL, |
4247 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4248 | if (ret != 0) { |
099e26bd | 4249 | perror("pthread_create kernel"); |
cf3af59e MD |
4250 | goto exit_kernel; |
4251 | } | |
7a485870 | 4252 | |
cf3af59e MD |
4253 | ret = pthread_join(kernel_thread, &status); |
4254 | if (ret != 0) { | |
4255 | perror("pthread_join"); | |
4256 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4257 | } |
4258 | ||
cf3af59e MD |
4259 | exit_kernel: |
4260 | ret = pthread_join(apps_thread, &status); | |
4261 | if (ret != 0) { | |
4262 | perror("pthread_join"); | |
4263 | goto error; /* join error, exit without cleanup */ | |
4264 | } | |
fac6795d | 4265 | |
cf3af59e | 4266 | exit_apps: |
099e26bd DG |
4267 | ret = pthread_join(reg_apps_thread, &status); |
4268 | if (ret != 0) { | |
4269 | perror("pthread_join"); | |
4270 | goto error; /* join error, exit without cleanup */ | |
4271 | } | |
4272 | ||
4273 | exit_reg_apps: | |
4274 | ret = pthread_join(dispatch_thread, &status); | |
4275 | if (ret != 0) { | |
4276 | perror("pthread_join"); | |
4277 | goto error; /* join error, exit without cleanup */ | |
4278 | } | |
4279 | ||
4280 | exit_dispatch: | |
cf3af59e MD |
4281 | ret = pthread_join(client_thread, &status); |
4282 | if (ret != 0) { | |
4283 | perror("pthread_join"); | |
4284 | goto error; /* join error, exit without cleanup */ | |
4285 | } | |
4286 | ||
3bd1e081 | 4287 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4288 | if (ret != 0) { |
3bd1e081 | 4289 | perror("join_consumer"); |
cf3af59e MD |
4290 | goto error; /* join error, exit without cleanup */ |
4291 | } | |
a88df331 | 4292 | |
cf3af59e | 4293 | exit_client: |
a88df331 | 4294 | exit: |
cf3af59e MD |
4295 | /* |
4296 | * cleanup() is called when no other thread is running. | |
4297 | */ | |
f6a9efaa | 4298 | rcu_thread_online(); |
cf3af59e | 4299 | cleanup(); |
f6a9efaa DG |
4300 | rcu_thread_offline(); |
4301 | rcu_unregister_thread(); | |
cf3af59e MD |
4302 | if (!ret) |
4303 | exit(EXIT_SUCCESS); | |
4304 | error: | |
5e16da05 | 4305 | exit(EXIT_FAILURE); |
fac6795d | 4306 | } |