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> |
bec39940 | 42 | #include <lttng-ht.h> |
e88129fc | 43 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 44 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 45 | |
1e307fab | 46 | #include <lttngerr.h> |
0857097f | 47 | #include "common/runas.h" |
fac6795d | 48 | |
54d01ffb | 49 | #include "channel.h" |
5eb91c98 | 50 | #include "compat/poll.h" |
099e26bd | 51 | #include "context.h" |
54d01ffb | 52 | #include "event.h" |
099e26bd | 53 | #include "futex.h" |
4771f025 | 54 | #include "kernel.h" |
32258573 | 55 | #include "lttng-sessiond.h" |
0fdd1e2c | 56 | #include "shm.h" |
56fff090 | 57 | #include "ust-app.h" |
1e307fab | 58 | #include "ust-ctl.h" |
8e68d1c8 | 59 | #include "utils.h" |
fac6795d | 60 | |
ebaeda94 MD |
61 | #define CONSUMERD_FILE "lttng-consumerd" |
62 | ||
3bd1e081 MD |
63 | struct consumer_data { |
64 | enum lttng_consumer_type type; | |
65 | ||
66 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
67 | sem_t sem; | |
68 | ||
69 | /* Mutex to control consumerd pid assignation */ | |
70 | pthread_mutex_t pid_mutex; | |
71 | pid_t pid; | |
72 | ||
73 | int err_sock; | |
74 | int cmd_sock; | |
75 | ||
76 | /* consumer error and command Unix socket path */ | |
77 | char err_unix_sock_path[PATH_MAX]; | |
78 | char cmd_unix_sock_path[PATH_MAX]; | |
79 | }; | |
80 | ||
75462a81 | 81 | /* Const values */ |
686204ab | 82 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 83 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
84 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
85 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
86 | ||
fac6795d | 87 | /* Variables */ |
1d4b027a | 88 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 89 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 90 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 91 | |
fac6795d DG |
92 | const char *progname; |
93 | const char *opt_tracing_group; | |
5b8719f5 | 94 | static int opt_sig_parent; |
fac6795d | 95 | static int opt_daemon; |
4fba7219 | 96 | static int opt_no_kernel; |
fac6795d | 97 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 98 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 99 | static char *rundir; |
3bd1e081 MD |
100 | |
101 | /* Consumer daemon specific control data */ | |
102 | static struct consumer_data kconsumer_data = { | |
103 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
104 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
105 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 106 | }; |
7753dea8 MD |
107 | static struct consumer_data ustconsumer64_data = { |
108 | .type = LTTNG_CONSUMER64_UST, | |
109 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
110 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
111 | }; | |
112 | static struct consumer_data ustconsumer32_data = { | |
113 | .type = LTTNG_CONSUMER32_UST, | |
114 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
115 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
116 | }; |
117 | ||
099e26bd | 118 | static int dispatch_thread_exit; |
fac6795d | 119 | |
54d01ffb DG |
120 | /* Global application Unix socket path */ |
121 | static char apps_unix_sock_path[PATH_MAX]; | |
122 | /* Global client Unix socket path */ | |
123 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
124 | /* global wait shm path for UST */ |
125 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 126 | |
1d4b027a | 127 | /* Sockets and FDs */ |
d6f42150 DG |
128 | static int client_sock; |
129 | static int apps_sock; | |
20fe2104 | 130 | static int kernel_tracer_fd; |
7a485870 | 131 | static int kernel_poll_pipe[2]; |
1d4b027a | 132 | |
273ea72c DG |
133 | /* |
134 | * Quit pipe for all threads. This permits a single cancellation point | |
135 | * for all threads when receiving an event on the pipe. | |
136 | */ | |
137 | static int thread_quit_pipe[2]; | |
138 | ||
099e26bd DG |
139 | /* |
140 | * This pipe is used to inform the thread managing application communication | |
141 | * that a command is queued and ready to be processed. | |
142 | */ | |
143 | static int apps_cmd_pipe[2]; | |
144 | ||
1d4b027a | 145 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 146 | static pthread_t apps_thread; |
099e26bd | 147 | static pthread_t reg_apps_thread; |
1d4b027a | 148 | static pthread_t client_thread; |
7a485870 | 149 | static pthread_t kernel_thread; |
099e26bd | 150 | static pthread_t dispatch_thread; |
5eb91c98 | 151 | |
fac6795d | 152 | |
099e26bd DG |
153 | /* |
154 | * UST registration command queue. This queue is tied with a futex and uses a N | |
155 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
156 | * | |
157 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
158 | * this queue and the wait/wake scheme. | |
159 | */ | |
160 | static struct ust_cmd_queue ust_cmd_queue; | |
161 | ||
b5541356 DG |
162 | /* |
163 | * Pointer initialized before thread creation. | |
164 | * | |
165 | * This points to the tracing session list containing the session count and a | |
166 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
167 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 168 | * |
d063d709 | 169 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 170 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
171 | */ |
172 | static struct ltt_session_list *session_list_ptr; | |
173 | ||
7753dea8 MD |
174 | int ust_consumerd64_fd = -1; |
175 | int ust_consumerd32_fd = -1; | |
176 | ||
fb6f1fa2 YB |
177 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
178 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
179 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
180 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
181 | |
182 | static | |
7753dea8 | 183 | void setup_consumerd_path(void) |
fb09408a | 184 | { |
fc7a59ce | 185 | const char *bin, *libdir; |
fb09408a | 186 | |
7753dea8 MD |
187 | /* |
188 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
189 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
190 | * has not been defined. | |
7753dea8 | 191 | */ |
ebaeda94 | 192 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
193 | if (!consumerd32_bin[0]) { |
194 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
195 | } |
196 | if (!consumerd32_libdir[0]) { | |
197 | consumerd32_libdir = INSTALL_LIB_PATH; | |
198 | } | |
199 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
200 | if (!consumerd64_bin[0]) { |
201 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 202 | } |
ebaeda94 MD |
203 | if (!consumerd64_libdir[0]) { |
204 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
205 | } |
206 | #else | |
207 | #error "Unknown bitness" | |
208 | #endif | |
209 | ||
fb09408a MD |
210 | /* |
211 | * runtime env. var. overrides the build default. | |
212 | */ | |
fc7a59ce AM |
213 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
214 | if (bin) { | |
215 | consumerd32_bin = bin; | |
7753dea8 | 216 | } |
fc7a59ce AM |
217 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
218 | if (bin) { | |
219 | consumerd64_bin = bin; | |
ebaeda94 MD |
220 | } |
221 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
222 | if (libdir) { | |
223 | consumerd32_libdir = libdir; | |
224 | } | |
225 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
226 | if (libdir) { | |
227 | consumerd64_libdir = libdir; | |
fb09408a MD |
228 | } |
229 | } | |
230 | ||
5eb91c98 DG |
231 | /* |
232 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
233 | */ | |
234 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
235 | unsigned int size) | |
236 | { | |
237 | int ret; | |
238 | ||
239 | if (events == NULL || size == 0) { | |
240 | ret = -1; | |
241 | goto error; | |
242 | } | |
243 | ||
244 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
245 | if (ret < 0) { | |
246 | goto error; | |
247 | } | |
248 | ||
249 | /* Add quit pipe */ | |
250 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
251 | if (ret < 0) { | |
252 | goto error; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | ||
257 | error: | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Check if the thread quit pipe was triggered. | |
263 | * | |
264 | * Return 1 if it was triggered else 0; | |
265 | */ | |
266 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
267 | { | |
268 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
269 | return 1; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
0fdd1e2c DG |
275 | /* |
276 | * Remove modules in reverse load order. | |
277 | */ | |
278 | static int modprobe_remove_kernel_modules(void) | |
279 | { | |
280 | int ret = 0, i; | |
281 | char modprobe[256]; | |
282 | ||
283 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
284 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 285 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
286 | kernel_modules_list[i].name); |
287 | if (ret < 0) { | |
24b487b8 | 288 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
289 | goto error; |
290 | } | |
291 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
292 | ret = system(modprobe); | |
293 | if (ret == -1) { | |
24b487b8 | 294 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
295 | kernel_modules_list[i].name); |
296 | } else if (kernel_modules_list[i].required | |
297 | && WEXITSTATUS(ret) != 0) { | |
298 | ERR("Unable to remove module %s", | |
299 | kernel_modules_list[i].name); | |
300 | } else { | |
301 | DBG("Modprobe removal successful %s", | |
302 | kernel_modules_list[i].name); | |
303 | } | |
304 | } | |
305 | ||
306 | error: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Return group ID of the tracing group or -1 if not found. | |
312 | */ | |
996b65c8 MD |
313 | static gid_t allowed_group(void) |
314 | { | |
315 | struct group *grp; | |
316 | ||
274e143b MD |
317 | if (opt_tracing_group) { |
318 | grp = getgrnam(opt_tracing_group); | |
319 | } else { | |
320 | grp = getgrnam(default_tracing_group); | |
321 | } | |
996b65c8 MD |
322 | if (!grp) { |
323 | return -1; | |
324 | } else { | |
325 | return grp->gr_gid; | |
326 | } | |
327 | } | |
328 | ||
273ea72c | 329 | /* |
5eb91c98 | 330 | * Init thread quit pipe. |
273ea72c DG |
331 | * |
332 | * Return -1 on error or 0 if all pipes are created. | |
333 | */ | |
334 | static int init_thread_quit_pipe(void) | |
335 | { | |
336 | int ret; | |
337 | ||
338 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
339 | if (ret < 0) { | |
340 | perror("thread quit pipe"); | |
341 | goto error; | |
342 | } | |
343 | ||
344 | error: | |
345 | return ret; | |
346 | } | |
347 | ||
fac6795d | 348 | /* |
d063d709 DG |
349 | * Complete teardown of a kernel session. This free all data structure related |
350 | * to a kernel session and update counter. | |
fac6795d | 351 | */ |
1d4b027a | 352 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 353 | { |
8f7a84dd DG |
354 | if (!session->kernel_session) { |
355 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 356 | return; |
8f7a84dd DG |
357 | } |
358 | ||
84ea9c99 | 359 | DBG("Tearing down kernel session"); |
d9800920 | 360 | |
84ea9c99 MD |
361 | /* |
362 | * If a custom kernel consumer was registered, close the socket before | |
363 | * tearing down the complete kernel session structure | |
364 | */ | |
365 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
366 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 367 | } |
84ea9c99 MD |
368 | |
369 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
370 | } |
371 | ||
f6a9efaa DG |
372 | /* |
373 | * Complete teardown of all UST sessions. This will free everything on his path | |
374 | * and destroy the core essence of all ust sessions :) | |
375 | */ | |
376 | static void teardown_ust_session(struct ltt_session *session) | |
377 | { | |
84cd17c6 MD |
378 | int ret; |
379 | ||
8f7a84dd DG |
380 | if (!session->ust_session) { |
381 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 382 | return; |
8f7a84dd DG |
383 | } |
384 | ||
84ea9c99 | 385 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 386 | |
84cd17c6 MD |
387 | ret = ust_app_destroy_trace_all(session->ust_session); |
388 | if (ret) { | |
389 | ERR("Error in ust_app_destroy_trace_all"); | |
390 | } | |
8f7a84dd | 391 | |
f6a9efaa DG |
392 | trace_ust_destroy_session(session->ust_session); |
393 | } | |
394 | ||
099e26bd DG |
395 | /* |
396 | * Stop all threads by closing the thread quit pipe. | |
397 | */ | |
cf3af59e MD |
398 | static void stop_threads(void) |
399 | { | |
5eb91c98 DG |
400 | int ret; |
401 | ||
cf3af59e MD |
402 | /* Stopping all threads */ |
403 | DBG("Terminating all threads"); | |
54d01ffb | 404 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
405 | if (ret < 0) { |
406 | ERR("write error on thread quit pipe"); | |
407 | } | |
408 | ||
099e26bd DG |
409 | /* Dispatch thread */ |
410 | dispatch_thread_exit = 1; | |
411 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
412 | } |
413 | ||
fac6795d | 414 | /* |
d063d709 | 415 | * Cleanup the daemon |
fac6795d | 416 | */ |
cf3af59e | 417 | static void cleanup(void) |
fac6795d | 418 | { |
1d4b027a DG |
419 | int ret; |
420 | char *cmd; | |
af9737e9 | 421 | struct ltt_session *sess, *stmp; |
fac6795d | 422 | |
1d4b027a | 423 | DBG("Cleaning up"); |
e07ae692 | 424 | |
67e40797 DG |
425 | DBG("Removing %s directory", rundir); |
426 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
427 | if (ret < 0) { | |
428 | ERR("asprintf failed. Something is really wrong!"); | |
429 | } | |
5461b305 | 430 | |
67e40797 DG |
431 | /* Remove lttng run directory */ |
432 | ret = system(cmd); | |
433 | if (ret < 0) { | |
434 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 435 | } |
67e40797 | 436 | free(cmd); |
5461b305 | 437 | |
1d4b027a | 438 | DBG("Cleaning up all session"); |
fac6795d | 439 | |
b5541356 | 440 | /* Destroy session list mutex */ |
273ea72c DG |
441 | if (session_list_ptr != NULL) { |
442 | pthread_mutex_destroy(&session_list_ptr->lock); | |
443 | ||
444 | /* Cleanup ALL session */ | |
54d01ffb DG |
445 | cds_list_for_each_entry_safe(sess, stmp, |
446 | &session_list_ptr->head, list) { | |
273ea72c | 447 | teardown_kernel_session(sess); |
f6a9efaa DG |
448 | teardown_ust_session(sess); |
449 | free(sess); | |
273ea72c DG |
450 | } |
451 | } | |
452 | ||
099e26bd | 453 | DBG("Closing all UST sockets"); |
56fff090 | 454 | ust_app_clean_list(); |
099e26bd | 455 | |
3bd1e081 | 456 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 457 | |
4fba7219 DG |
458 | if (is_root && !opt_no_kernel) { |
459 | DBG2("Closing kernel fd"); | |
460 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
461 | DBG("Unloading kernel modules"); |
462 | modprobe_remove_kernel_modules(); | |
463 | } | |
5eb91c98 DG |
464 | |
465 | close(thread_quit_pipe[0]); | |
466 | close(thread_quit_pipe[1]); | |
421cb601 DG |
467 | |
468 | /* <fun> */ | |
f56a39af | 469 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
470 | "Matthew, BEET driven development works!%c[%dm", |
471 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
472 | /* </fun> */ | |
fac6795d DG |
473 | } |
474 | ||
e065084a | 475 | /* |
d063d709 | 476 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 477 | * |
d063d709 | 478 | * Return lttcomm error code. |
e065084a DG |
479 | */ |
480 | static int send_unix_sock(int sock, void *buf, size_t len) | |
481 | { | |
482 | /* Check valid length */ | |
483 | if (len <= 0) { | |
484 | return -1; | |
485 | } | |
486 | ||
487 | return lttcomm_send_unix_sock(sock, buf, len); | |
488 | } | |
489 | ||
5461b305 | 490 | /* |
d063d709 | 491 | * Free memory of a command context structure. |
5461b305 | 492 | */ |
a2fb29a5 | 493 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 494 | { |
a2fb29a5 DG |
495 | DBG("Clean command context structure"); |
496 | if (*cmd_ctx) { | |
497 | if ((*cmd_ctx)->llm) { | |
498 | free((*cmd_ctx)->llm); | |
5461b305 | 499 | } |
a2fb29a5 DG |
500 | if ((*cmd_ctx)->lsm) { |
501 | free((*cmd_ctx)->lsm); | |
5461b305 | 502 | } |
a2fb29a5 DG |
503 | free(*cmd_ctx); |
504 | *cmd_ctx = NULL; | |
5461b305 DG |
505 | } |
506 | } | |
507 | ||
f3ed775e | 508 | /* |
d063d709 | 509 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 510 | */ |
2bdd86d4 | 511 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
512 | int sock, struct ltt_kernel_channel *channel, |
513 | uid_t uid, gid_t gid) | |
f3ed775e DG |
514 | { |
515 | int ret; | |
f3ed775e | 516 | struct ltt_kernel_stream *stream; |
3bd1e081 | 517 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 518 | |
3bd1e081 | 519 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 520 | channel->channel->name); |
f3ed775e | 521 | |
3bd1e081 MD |
522 | /* Send channel */ |
523 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
524 | lkm.u.channel.channel_key = channel->fd; | |
525 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
526 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 527 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 528 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 529 | if (ret < 0) { |
3bd1e081 | 530 | perror("send consumer channel"); |
f3ed775e DG |
531 | goto error; |
532 | } | |
533 | ||
3bd1e081 | 534 | /* Send streams */ |
7a485870 | 535 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
536 | if (!stream->fd) { |
537 | continue; | |
538 | } | |
539 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
540 | lkm.u.stream.channel_key = channel->fd; | |
541 | lkm.u.stream.stream_key = stream->fd; | |
542 | lkm.u.stream.state = stream->state; | |
543 | lkm.u.stream.output = channel->channel->attr.output; | |
544 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
545 | lkm.u.stream.uid = uid; |
546 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
547 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
548 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
549 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
550 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
551 | if (ret < 0) { | |
552 | perror("send consumer stream"); | |
553 | goto error; | |
554 | } | |
555 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
556 | if (ret < 0) { | |
557 | perror("send consumer stream ancillary data"); | |
558 | goto error; | |
f3ed775e DG |
559 | } |
560 | } | |
561 | ||
3bd1e081 | 562 | DBG("consumer channel streams sent"); |
f3ed775e DG |
563 | |
564 | return 0; | |
565 | ||
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
570 | /* | |
d063d709 | 571 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 572 | */ |
2bdd86d4 | 573 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 574 | struct ltt_kernel_session *session) |
f3ed775e DG |
575 | { |
576 | int ret; | |
577 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
578 | struct lttcomm_consumer_msg lkm; |
579 | int sock = session->consumer_fd; | |
7a485870 DG |
580 | |
581 | DBG("Sending metadata stream fd"); | |
582 | ||
2bdd86d4 | 583 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 584 | if (session->consumer_fd == 0) { |
3bd1e081 | 585 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
586 | } |
587 | ||
7a485870 | 588 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
589 | /* Send metadata channel fd */ |
590 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
591 | lkm.u.channel.channel_key = session->metadata->fd; | |
592 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
593 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
594 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
595 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
596 | if (ret < 0) { | |
597 | perror("send consumer channel"); | |
598 | goto error; | |
599 | } | |
600 | ||
601 | /* Send metadata stream fd */ | |
602 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
603 | lkm.u.stream.channel_key = session->metadata->fd; | |
604 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
605 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
606 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
607 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
608 | lkm.u.stream.uid = session->uid; |
609 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
610 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
611 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
612 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
613 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
614 | if (ret < 0) { | |
615 | perror("send consumer stream"); | |
616 | goto error; | |
617 | } | |
618 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 619 | if (ret < 0) { |
3bd1e081 | 620 | perror("send consumer stream"); |
7a485870 DG |
621 | goto error; |
622 | } | |
623 | } | |
f3ed775e | 624 | |
f3ed775e | 625 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
626 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
627 | session->uid, session->gid); | |
2bdd86d4 MD |
628 | if (ret < 0) { |
629 | goto error; | |
630 | } | |
631 | } | |
632 | ||
633 | DBG("consumer fds (metadata and channel streams) sent"); | |
634 | ||
635 | return 0; | |
636 | ||
637 | error: | |
638 | return ret; | |
639 | } | |
640 | ||
fac6795d | 641 | /* |
0fdd1e2c | 642 | * Notify UST applications using the shm mmap futex. |
fac6795d | 643 | */ |
0fdd1e2c | 644 | static int notify_ust_apps(int active) |
fac6795d | 645 | { |
0fdd1e2c | 646 | char *wait_shm_mmap; |
fac6795d | 647 | |
0fdd1e2c | 648 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 649 | |
0fdd1e2c DG |
650 | /* See shm.c for this call implying mmap, shm and futex calls */ |
651 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
652 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
653 | goto error; |
654 | } | |
655 | ||
0fdd1e2c DG |
656 | /* Wake waiting process */ |
657 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
658 | ||
659 | /* Apps notified successfully */ | |
660 | return 0; | |
fac6795d DG |
661 | |
662 | error: | |
0fdd1e2c | 663 | return -1; |
fac6795d DG |
664 | } |
665 | ||
e065084a | 666 | /* |
d063d709 DG |
667 | * Setup the outgoing data buffer for the response (llm) by allocating the |
668 | * right amount of memory and copying the original information from the lsm | |
669 | * structure. | |
ca95a216 | 670 | * |
d063d709 | 671 | * Return total size of the buffer pointed by buf. |
ca95a216 | 672 | */ |
5461b305 | 673 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 674 | { |
f3ed775e | 675 | int ret, buf_size; |
ca95a216 | 676 | |
f3ed775e | 677 | buf_size = size; |
5461b305 | 678 | |
ba7f0ae5 | 679 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 680 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 681 | perror("zmalloc"); |
5461b305 | 682 | ret = -ENOMEM; |
ca95a216 DG |
683 | goto error; |
684 | } | |
685 | ||
5461b305 DG |
686 | /* Copy common data */ |
687 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 688 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 689 | |
5461b305 DG |
690 | cmd_ctx->llm->data_size = size; |
691 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
692 | ||
ca95a216 DG |
693 | return buf_size; |
694 | ||
695 | error: | |
696 | return ret; | |
697 | } | |
698 | ||
7a485870 | 699 | /* |
5eb91c98 | 700 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 701 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 702 | */ |
5eb91c98 | 703 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 704 | { |
5eb91c98 | 705 | int ret; |
7a485870 DG |
706 | struct ltt_session *session; |
707 | struct ltt_kernel_channel *channel; | |
708 | ||
5eb91c98 | 709 | DBG("Updating kernel poll set"); |
7a485870 | 710 | |
54d01ffb | 711 | session_lock_list(); |
b5541356 | 712 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 713 | session_lock(session); |
7a485870 | 714 | if (session->kernel_session == NULL) { |
54d01ffb | 715 | session_unlock(session); |
7a485870 DG |
716 | continue; |
717 | } | |
7a485870 | 718 | |
54d01ffb DG |
719 | cds_list_for_each_entry(channel, |
720 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
721 | /* Add channel fd to the kernel poll set */ |
722 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
723 | if (ret < 0) { | |
54d01ffb | 724 | session_unlock(session); |
5eb91c98 DG |
725 | goto error; |
726 | } | |
727 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 728 | } |
54d01ffb | 729 | session_unlock(session); |
7a485870 | 730 | } |
54d01ffb | 731 | session_unlock_list(); |
7a485870 | 732 | |
5eb91c98 | 733 | return 0; |
7a485870 DG |
734 | |
735 | error: | |
54d01ffb | 736 | session_unlock_list(); |
7a485870 DG |
737 | return -1; |
738 | } | |
739 | ||
740 | /* | |
54d01ffb | 741 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 742 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 743 | * |
d063d709 | 744 | * Useful for CPU hotplug feature. |
7a485870 | 745 | */ |
2bdd86d4 | 746 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
747 | { |
748 | int ret = 0; | |
749 | struct ltt_session *session; | |
750 | struct ltt_kernel_channel *channel; | |
751 | ||
752 | DBG("Updating kernel streams for channel fd %d", fd); | |
753 | ||
54d01ffb | 754 | session_lock_list(); |
b5541356 | 755 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 756 | session_lock(session); |
7a485870 | 757 | if (session->kernel_session == NULL) { |
54d01ffb | 758 | session_unlock(session); |
7a485870 DG |
759 | continue; |
760 | } | |
d9800920 DG |
761 | |
762 | /* This is not suppose to be 0 but this is an extra security check */ | |
763 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 764 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
765 | } |
766 | ||
5eb91c98 DG |
767 | cds_list_for_each_entry(channel, |
768 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
769 | if (channel->fd == fd) { |
770 | DBG("Channel found, updating kernel streams"); | |
771 | ret = kernel_open_channel_stream(channel); | |
772 | if (ret < 0) { | |
b3c750d2 | 773 | goto error; |
7a485870 | 774 | } |
d9800920 | 775 | |
7a485870 | 776 | /* |
5eb91c98 DG |
777 | * Have we already sent fds to the consumer? If yes, it means |
778 | * that tracing is started so it is safe to send our updated | |
779 | * stream fds. | |
7a485870 | 780 | */ |
3bd1e081 | 781 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 782 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
783 | session->kernel_session->consumer_fd, channel, |
784 | session->uid, session->gid); | |
7a485870 | 785 | if (ret < 0) { |
b3c750d2 | 786 | goto error; |
7a485870 DG |
787 | } |
788 | } | |
b3c750d2 | 789 | goto error; |
7a485870 DG |
790 | } |
791 | } | |
54d01ffb | 792 | session_unlock(session); |
7a485870 | 793 | } |
54d01ffb | 794 | session_unlock_list(); |
b3c750d2 | 795 | return ret; |
7a485870 | 796 | |
b3c750d2 | 797 | error: |
54d01ffb DG |
798 | session_unlock(session); |
799 | session_unlock_list(); | |
7a485870 DG |
800 | return ret; |
801 | } | |
802 | ||
487cf67c DG |
803 | /* |
804 | * For each tracing session, update newly registered apps. | |
805 | */ | |
806 | static void update_ust_app(int app_sock) | |
807 | { | |
808 | struct ltt_session *sess, *stmp; | |
809 | ||
810 | /* For all tracing session(s) */ | |
811 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
812 | if (sess->ust_session) { |
813 | ust_app_global_update(sess->ust_session, app_sock); | |
814 | } | |
487cf67c DG |
815 | } |
816 | } | |
817 | ||
7a485870 | 818 | /* |
d063d709 | 819 | * This thread manage event coming from the kernel. |
7a485870 | 820 | * |
d063d709 DG |
821 | * Features supported in this thread: |
822 | * -) CPU Hotplug | |
7a485870 DG |
823 | */ |
824 | static void *thread_manage_kernel(void *data) | |
825 | { | |
5eb91c98 DG |
826 | int ret, i, pollfd, update_poll_flag = 1; |
827 | uint32_t revents, nb_fd; | |
7a485870 | 828 | char tmp; |
5eb91c98 | 829 | struct lttng_poll_event events; |
7a485870 DG |
830 | |
831 | DBG("Thread manage kernel started"); | |
832 | ||
5eb91c98 DG |
833 | ret = create_thread_poll_set(&events, 2); |
834 | if (ret < 0) { | |
835 | goto error; | |
836 | } | |
837 | ||
838 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
839 | if (ret < 0) { | |
840 | goto error; | |
841 | } | |
842 | ||
7a485870 DG |
843 | while (1) { |
844 | if (update_poll_flag == 1) { | |
5f822d0a DG |
845 | /* |
846 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
847 | * quit pipe and the kernel pipe. | |
848 | */ | |
849 | events.nb_fd = 2; | |
850 | ||
5eb91c98 DG |
851 | ret = update_kernel_poll(&events); |
852 | if (ret < 0) { | |
7a485870 DG |
853 | goto error; |
854 | } | |
855 | update_poll_flag = 0; | |
856 | } | |
857 | ||
5eb91c98 DG |
858 | nb_fd = LTTNG_POLL_GETNB(&events); |
859 | ||
860 | DBG("Thread kernel polling on %d fds", nb_fd); | |
861 | ||
862 | /* Zeroed the poll events */ | |
863 | lttng_poll_reset(&events); | |
7a485870 DG |
864 | |
865 | /* Poll infinite value of time */ | |
5eb91c98 | 866 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 867 | if (ret < 0) { |
7a485870 DG |
868 | goto error; |
869 | } else if (ret == 0) { | |
870 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
871 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
872 | "This should not have happened! Continuing..."); | |
7a485870 DG |
873 | continue; |
874 | } | |
875 | ||
5eb91c98 DG |
876 | for (i = 0; i < nb_fd; i++) { |
877 | /* Fetch once the poll data */ | |
878 | revents = LTTNG_POLL_GETEV(&events, i); | |
879 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 880 | |
5eb91c98 DG |
881 | /* Thread quit pipe has been closed. Killing thread. */ |
882 | ret = check_thread_quit_pipe(pollfd, revents); | |
883 | if (ret) { | |
884 | goto error; | |
885 | } | |
7a485870 | 886 | |
5eb91c98 DG |
887 | /* Check for data on kernel pipe */ |
888 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
889 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
890 | update_poll_flag = 1; | |
891 | continue; | |
892 | } else { | |
893 | /* | |
894 | * New CPU detected by the kernel. Adding kernel stream to | |
895 | * kernel session and updating the kernel consumer | |
896 | */ | |
897 | if (revents & LPOLLIN) { | |
2bdd86d4 | 898 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
899 | if (ret < 0) { |
900 | continue; | |
901 | } | |
902 | break; | |
903 | /* | |
904 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
905 | * and unregister kernel stream at this point. | |
906 | */ | |
7a485870 | 907 | } |
7a485870 DG |
908 | } |
909 | } | |
910 | } | |
911 | ||
912 | error: | |
913 | DBG("Kernel thread dying"); | |
273ea72c DG |
914 | close(kernel_poll_pipe[0]); |
915 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
916 | |
917 | lttng_poll_clean(&events); | |
918 | ||
7a485870 DG |
919 | return NULL; |
920 | } | |
921 | ||
1d4b027a | 922 | /* |
3bd1e081 | 923 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 924 | */ |
3bd1e081 | 925 | static void *thread_manage_consumer(void *data) |
1d4b027a | 926 | { |
5eb91c98 DG |
927 | int sock = 0, i, ret, pollfd; |
928 | uint32_t revents, nb_fd; | |
1d4b027a | 929 | enum lttcomm_return_code code; |
5eb91c98 | 930 | struct lttng_poll_event events; |
3bd1e081 | 931 | struct consumer_data *consumer_data = data; |
1d4b027a | 932 | |
3bd1e081 | 933 | DBG("[thread] Manage consumer started"); |
1d4b027a | 934 | |
3bd1e081 | 935 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
936 | if (ret < 0) { |
937 | goto error; | |
938 | } | |
939 | ||
5eb91c98 DG |
940 | /* |
941 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
942 | * Nothing more will be added to this poll set. | |
943 | */ | |
944 | ret = create_thread_poll_set(&events, 2); | |
945 | if (ret < 0) { | |
946 | goto error; | |
947 | } | |
273ea72c | 948 | |
3bd1e081 | 949 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
950 | if (ret < 0) { |
951 | goto error; | |
952 | } | |
953 | ||
954 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
955 | |
956 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 957 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 958 | if (ret < 0) { |
273ea72c DG |
959 | goto error; |
960 | } | |
961 | ||
5eb91c98 DG |
962 | for (i = 0; i < nb_fd; i++) { |
963 | /* Fetch once the poll data */ | |
964 | revents = LTTNG_POLL_GETEV(&events, i); | |
965 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
966 | ||
967 | /* Thread quit pipe has been closed. Killing thread. */ | |
968 | ret = check_thread_quit_pipe(pollfd, revents); | |
969 | if (ret) { | |
970 | goto error; | |
971 | } | |
972 | ||
973 | /* Event on the registration socket */ | |
3bd1e081 | 974 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 975 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 976 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
977 | goto error; |
978 | } | |
979 | } | |
273ea72c DG |
980 | } |
981 | ||
3bd1e081 | 982 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
983 | if (sock < 0) { |
984 | goto error; | |
985 | } | |
986 | ||
3bd1e081 | 987 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 988 | |
712ea556 | 989 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
990 | ret = lttcomm_recv_unix_sock(sock, &code, |
991 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
992 | if (ret <= 0) { |
993 | goto error; | |
994 | } | |
995 | ||
3bd1e081 MD |
996 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
997 | consumer_data->cmd_sock = | |
998 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
999 | if (consumer_data->cmd_sock < 0) { | |
1000 | sem_post(&consumer_data->sem); | |
48842b30 | 1001 | PERROR("consumer connect"); |
1d4b027a DG |
1002 | goto error; |
1003 | } | |
1004 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1005 | sem_post(&consumer_data->sem); |
1006 | DBG("consumer command socket ready"); | |
1d4b027a | 1007 | } else { |
3bd1e081 | 1008 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1009 | lttcomm_get_readable_code(-code)); |
1010 | goto error; | |
1011 | } | |
1012 | ||
54d01ffb | 1013 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1014 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1015 | if (ret < 0) { |
72079cae DG |
1016 | goto error; |
1017 | } | |
1018 | ||
5eb91c98 DG |
1019 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1020 | if (ret < 0) { | |
72079cae | 1021 | goto error; |
5eb91c98 DG |
1022 | } |
1023 | ||
1024 | /* Update number of fd */ | |
1025 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1026 | ||
1027 | /* Inifinite blocking call, waiting for transmission */ | |
1028 | ret = lttng_poll_wait(&events, -1); | |
1029 | if (ret < 0) { | |
72079cae DG |
1030 | goto error; |
1031 | } | |
1032 | ||
5eb91c98 DG |
1033 | for (i = 0; i < nb_fd; i++) { |
1034 | /* Fetch once the poll data */ | |
1035 | revents = LTTNG_POLL_GETEV(&events, i); | |
1036 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1037 | ||
1038 | /* Thread quit pipe has been closed. Killing thread. */ | |
1039 | ret = check_thread_quit_pipe(pollfd, revents); | |
1040 | if (ret) { | |
1041 | goto error; | |
1042 | } | |
1043 | ||
1044 | /* Event on the kconsumerd socket */ | |
1045 | if (pollfd == sock) { | |
1046 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1047 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1048 | goto error; |
1049 | } | |
1050 | } | |
1051 | } | |
1052 | ||
712ea556 | 1053 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1054 | ret = lttcomm_recv_unix_sock(sock, &code, |
1055 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1056 | if (ret <= 0) { |
3bd1e081 | 1057 | ERR("consumer closed the command socket"); |
712ea556 | 1058 | goto error; |
6f61d021 | 1059 | } |
1d4b027a | 1060 | |
3bd1e081 | 1061 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1062 | |
1d4b027a | 1063 | error: |
3bd1e081 MD |
1064 | DBG("consumer thread dying"); |
1065 | close(consumer_data->err_sock); | |
1066 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1067 | close(sock); |
273ea72c | 1068 | |
3bd1e081 MD |
1069 | unlink(consumer_data->err_unix_sock_path); |
1070 | unlink(consumer_data->cmd_unix_sock_path); | |
1071 | consumer_data->pid = 0; | |
1d4b027a | 1072 | |
5eb91c98 | 1073 | lttng_poll_clean(&events); |
0177d773 | 1074 | |
5eb91c98 | 1075 | return NULL; |
099e26bd DG |
1076 | } |
1077 | ||
099e26bd DG |
1078 | /* |
1079 | * This thread manage application communication. | |
1d4b027a DG |
1080 | */ |
1081 | static void *thread_manage_apps(void *data) | |
099e26bd | 1082 | { |
5eb91c98 DG |
1083 | int i, ret, pollfd; |
1084 | uint32_t revents, nb_fd; | |
099e26bd | 1085 | struct ust_command ust_cmd; |
5eb91c98 | 1086 | struct lttng_poll_event events; |
099e26bd DG |
1087 | |
1088 | DBG("[thread] Manage application started"); | |
1089 | ||
f6a9efaa DG |
1090 | rcu_register_thread(); |
1091 | rcu_thread_online(); | |
1092 | ||
5eb91c98 DG |
1093 | ret = create_thread_poll_set(&events, 2); |
1094 | if (ret < 0) { | |
1095 | goto error; | |
1096 | } | |
099e26bd | 1097 | |
5eb91c98 DG |
1098 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1099 | if (ret < 0) { | |
1100 | goto error; | |
1101 | } | |
099e26bd | 1102 | |
5eb91c98 DG |
1103 | while (1) { |
1104 | /* Zeroed the events structure */ | |
1105 | lttng_poll_reset(&events); | |
0177d773 | 1106 | |
5eb91c98 | 1107 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1108 | |
1109 | DBG("Apps thread polling on %d fds", nb_fd); | |
1110 | ||
1111 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1112 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1113 | if (ret < 0) { |
099e26bd DG |
1114 | goto error; |
1115 | } | |
1116 | ||
5eb91c98 DG |
1117 | for (i = 0; i < nb_fd; i++) { |
1118 | /* Fetch once the poll data */ | |
1119 | revents = LTTNG_POLL_GETEV(&events, i); | |
1120 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1121 | ||
1122 | /* Thread quit pipe has been closed. Killing thread. */ | |
1123 | ret = check_thread_quit_pipe(pollfd, revents); | |
1124 | if (ret) { | |
099e26bd | 1125 | goto error; |
5eb91c98 | 1126 | } |
099e26bd | 1127 | |
5eb91c98 DG |
1128 | /* Inspect the apps cmd pipe */ |
1129 | if (pollfd == apps_cmd_pipe[0]) { | |
1130 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1131 | ERR("Apps command pipe error"); | |
0177d773 | 1132 | goto error; |
5eb91c98 DG |
1133 | } else if (revents & LPOLLIN) { |
1134 | /* Empty pipe */ | |
1135 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1136 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1137 | perror("read apps cmd pipe"); | |
1138 | goto error; | |
1139 | } | |
099e26bd | 1140 | |
5eb91c98 | 1141 | /* Register applicaton to the session daemon */ |
56fff090 | 1142 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1143 | ust_cmd.sock); |
88ff5b7f | 1144 | if (ret == -ENOMEM) { |
5eb91c98 | 1145 | goto error; |
88ff5b7f MD |
1146 | } else if (ret < 0) { |
1147 | break; | |
5eb91c98 DG |
1148 | } |
1149 | ||
acc7b41b MD |
1150 | /* |
1151 | * Add channel(s) and event(s) to newly registered apps | |
1152 | * from lttng global UST domain. | |
1153 | */ | |
1154 | update_ust_app(ust_cmd.sock); | |
1155 | ||
f2ca2e25 | 1156 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1157 | if (ret < 0) { |
1158 | /* | |
1159 | * If the registration is not possible, we simply | |
1160 | * unregister the apps and continue | |
1161 | */ | |
56fff090 | 1162 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1163 | } else { |
1164 | /* | |
1165 | * We just need here to monitor the close of the UST | |
1166 | * socket and poll set monitor those by default. | |
1167 | */ | |
1168 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1169 | if (ret < 0) { | |
1170 | goto error; | |
1171 | } | |
1172 | ||
54d01ffb DG |
1173 | DBG("Apps with sock %d added to poll set", |
1174 | ust_cmd.sock); | |
5eb91c98 | 1175 | } |
487cf67c | 1176 | |
5eb91c98 | 1177 | break; |
0177d773 | 1178 | } |
5eb91c98 DG |
1179 | } else { |
1180 | /* | |
54d01ffb DG |
1181 | * At this point, we know that a registered application made |
1182 | * the event at poll_wait. | |
5eb91c98 DG |
1183 | */ |
1184 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1185 | /* Removing from the poll set */ | |
1186 | ret = lttng_poll_del(&events, pollfd); | |
1187 | if (ret < 0) { | |
1188 | goto error; | |
1189 | } | |
099e26bd | 1190 | |
b9d9b220 | 1191 | /* Socket closed on remote end. */ |
56fff090 | 1192 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1193 | break; |
1194 | } | |
099e26bd DG |
1195 | } |
1196 | } | |
099e26bd DG |
1197 | } |
1198 | ||
1199 | error: | |
1200 | DBG("Application communication apps dying"); | |
1201 | close(apps_cmd_pipe[0]); | |
1202 | close(apps_cmd_pipe[1]); | |
1203 | ||
5eb91c98 | 1204 | lttng_poll_clean(&events); |
099e26bd | 1205 | |
f6a9efaa DG |
1206 | rcu_thread_offline(); |
1207 | rcu_unregister_thread(); | |
099e26bd DG |
1208 | return NULL; |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Dispatch request from the registration threads to the application | |
1213 | * communication thread. | |
1214 | */ | |
1215 | static void *thread_dispatch_ust_registration(void *data) | |
1216 | { | |
1217 | int ret; | |
1218 | struct cds_wfq_node *node; | |
1219 | struct ust_command *ust_cmd = NULL; | |
1220 | ||
1221 | DBG("[thread] Dispatch UST command started"); | |
1222 | ||
1223 | while (!dispatch_thread_exit) { | |
1224 | /* Atomically prepare the queue futex */ | |
1225 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1226 | ||
1227 | do { | |
1228 | /* Dequeue command for registration */ | |
1229 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1230 | if (node == NULL) { | |
00a17c97 | 1231 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1232 | /* Continue thread execution */ |
1233 | break; | |
1234 | } | |
1235 | ||
1236 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1237 | ||
2f50c8a3 DG |
1238 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1239 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1240 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1241 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1242 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1243 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1244 | /* |
1245 | * Inform apps thread of the new application registration. This | |
1246 | * call is blocking so we can be assured that the data will be read | |
1247 | * at some point in time or wait to the end of the world :) | |
1248 | */ | |
1249 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1250 | sizeof(struct ust_command)); | |
1251 | if (ret < 0) { | |
1252 | perror("write apps cmd pipe"); | |
1253 | if (errno == EBADF) { | |
1254 | /* | |
1255 | * We can't inform the application thread to process | |
1256 | * registration. We will exit or else application | |
1257 | * registration will not occur and tracing will never | |
1258 | * start. | |
1259 | */ | |
1260 | goto error; | |
1261 | } | |
1262 | } | |
1263 | free(ust_cmd); | |
1264 | } while (node != NULL); | |
1265 | ||
1266 | /* Futex wait on queue. Blocking call on futex() */ | |
1267 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1268 | } | |
1269 | ||
1270 | error: | |
1271 | DBG("Dispatch thread dying"); | |
1272 | return NULL; | |
1273 | } | |
1274 | ||
1275 | /* | |
1276 | * This thread manage application registration. | |
1277 | */ | |
1278 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1279 | { |
5eb91c98 DG |
1280 | int sock = 0, i, ret, pollfd; |
1281 | uint32_t revents, nb_fd; | |
1282 | struct lttng_poll_event events; | |
099e26bd DG |
1283 | /* |
1284 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1285 | * freed in the manage apps thread. | |
1286 | */ | |
1287 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1288 | |
099e26bd | 1289 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1290 | |
1291 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1292 | if (ret < 0) { | |
1293 | goto error; | |
1294 | } | |
1295 | ||
5eb91c98 DG |
1296 | /* |
1297 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1298 | * more will be added to this poll set. | |
1299 | */ | |
1300 | ret = create_thread_poll_set(&events, 2); | |
1301 | if (ret < 0) { | |
1302 | goto error; | |
1303 | } | |
273ea72c | 1304 | |
5eb91c98 DG |
1305 | /* Add the application registration socket */ |
1306 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1307 | if (ret < 0) { | |
1308 | goto error; | |
1309 | } | |
273ea72c | 1310 | |
1d4b027a | 1311 | /* Notify all applications to register */ |
0fdd1e2c DG |
1312 | ret = notify_ust_apps(1); |
1313 | if (ret < 0) { | |
1314 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1315 | "Execution continues but there might be problem for already\n" |
1316 | "running applications that wishes to register."); | |
0fdd1e2c | 1317 | } |
1d4b027a DG |
1318 | |
1319 | while (1) { | |
1320 | DBG("Accepting application registration"); | |
273ea72c | 1321 | |
5eb91c98 DG |
1322 | nb_fd = LTTNG_POLL_GETNB(&events); |
1323 | ||
273ea72c | 1324 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1325 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1326 | if (ret < 0) { |
273ea72c DG |
1327 | goto error; |
1328 | } | |
1329 | ||
5eb91c98 DG |
1330 | for (i = 0; i < nb_fd; i++) { |
1331 | /* Fetch once the poll data */ | |
1332 | revents = LTTNG_POLL_GETEV(&events, i); | |
1333 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1334 | |
5eb91c98 DG |
1335 | /* Thread quit pipe has been closed. Killing thread. */ |
1336 | ret = check_thread_quit_pipe(pollfd, revents); | |
1337 | if (ret) { | |
90014c57 DG |
1338 | goto error; |
1339 | } | |
1d4b027a | 1340 | |
5eb91c98 DG |
1341 | /* Event on the registration socket */ |
1342 | if (pollfd == apps_sock) { | |
1343 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1344 | ERR("Register apps socket poll error"); | |
1345 | goto error; | |
1346 | } else if (revents & LPOLLIN) { | |
1347 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1348 | if (sock < 0) { | |
1349 | goto error; | |
1350 | } | |
099e26bd | 1351 | |
5eb91c98 | 1352 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1353 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1354 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1355 | perror("ust command zmalloc"); |
5eb91c98 DG |
1356 | goto error; |
1357 | } | |
1d4b027a | 1358 | |
5eb91c98 DG |
1359 | /* |
1360 | * Using message-based transmissions to ensure we don't | |
1361 | * have to deal with partially received messages. | |
1362 | */ | |
1363 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1364 | sizeof(struct ust_register_msg)); | |
1365 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1366 | if (ret < 0) { | |
1367 | perror("lttcomm_recv_unix_sock register apps"); | |
1368 | } else { | |
1369 | ERR("Wrong size received on apps register"); | |
1370 | } | |
1371 | free(ust_cmd); | |
1372 | close(sock); | |
1373 | continue; | |
1374 | } | |
099e26bd | 1375 | |
5eb91c98 | 1376 | ust_cmd->sock = sock; |
099e26bd | 1377 | |
5eb91c98 DG |
1378 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1379 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1380 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1381 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1382 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1383 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1384 | |
5eb91c98 DG |
1385 | /* |
1386 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1387 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1388 | */ |
1389 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1390 | ||
1391 | /* | |
1392 | * Wake the registration queue futex. Implicit memory | |
1393 | * barrier with the exchange in cds_wfq_enqueue. | |
1394 | */ | |
1395 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1396 | } | |
1397 | } | |
90014c57 | 1398 | } |
1d4b027a DG |
1399 | } |
1400 | ||
1401 | error: | |
0fdd1e2c DG |
1402 | DBG("UST Registration thread dying"); |
1403 | ||
1404 | /* Notify that the registration thread is gone */ | |
1405 | notify_ust_apps(0); | |
1406 | ||
1407 | close(apps_sock); | |
1408 | close(sock); | |
273ea72c | 1409 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1410 | |
5eb91c98 DG |
1411 | lttng_poll_clean(&events); |
1412 | ||
1d4b027a DG |
1413 | return NULL; |
1414 | } | |
1415 | ||
8c0faa1d | 1416 | /* |
3bd1e081 | 1417 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1418 | * exec or it will fails. |
8c0faa1d | 1419 | */ |
3bd1e081 | 1420 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1421 | { |
1422 | int ret; | |
ee0b0061 DG |
1423 | struct timespec timeout; |
1424 | ||
1425 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1426 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1427 | |
1428 | /* Setup semaphore */ | |
3bd1e081 | 1429 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1430 | if (ret < 0) { |
3bd1e081 | 1431 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1432 | goto error; |
1433 | } | |
8c0faa1d | 1434 | |
3bd1e081 MD |
1435 | ret = pthread_create(&consumer_data->thread, NULL, |
1436 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1437 | if (ret != 0) { |
3bd1e081 | 1438 | PERROR("pthread_create consumer"); |
ee0b0061 | 1439 | ret = -1; |
8c0faa1d DG |
1440 | goto error; |
1441 | } | |
1442 | ||
ee0b0061 DG |
1443 | /* Get time for sem_timedwait absolute timeout */ |
1444 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1445 | if (ret < 0) { | |
3bd1e081 | 1446 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1447 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1448 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1449 | } else { |
1450 | /* Normal timeout if the gettime was successful */ | |
1451 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1452 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1453 | } |
8c0faa1d | 1454 | |
ee0b0061 DG |
1455 | if (ret < 0) { |
1456 | if (errno == ETIMEDOUT) { | |
1457 | /* | |
1458 | * Call has timed out so we kill the kconsumerd_thread and return | |
1459 | * an error. | |
1460 | */ | |
3bd1e081 MD |
1461 | ERR("The consumer thread was never ready. Killing it"); |
1462 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1463 | if (ret < 0) { |
3bd1e081 | 1464 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1465 | } |
1466 | } else { | |
3bd1e081 | 1467 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1468 | } |
1469 | goto error; | |
1470 | } | |
1471 | ||
3bd1e081 MD |
1472 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1473 | if (consumer_data->pid == 0) { | |
712ea556 | 1474 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1475 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1476 | goto error; |
1477 | } | |
3bd1e081 | 1478 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1479 | |
8c0faa1d DG |
1480 | return 0; |
1481 | ||
1482 | error: | |
1483 | return ret; | |
1484 | } | |
1485 | ||
d9800920 | 1486 | /* |
3bd1e081 | 1487 | * Join consumer thread |
d9800920 | 1488 | */ |
3bd1e081 | 1489 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1490 | { |
1491 | void *status; | |
1492 | int ret; | |
1493 | ||
3bd1e081 MD |
1494 | if (consumer_data->pid != 0) { |
1495 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1496 | if (ret) { |
3bd1e081 | 1497 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1498 | return ret; |
1499 | } | |
3bd1e081 | 1500 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1501 | } else { |
1502 | return 0; | |
1503 | } | |
1504 | } | |
1505 | ||
8c0faa1d | 1506 | /* |
3bd1e081 | 1507 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1508 | * |
d063d709 | 1509 | * Return pid if successful else -1. |
8c0faa1d | 1510 | */ |
3bd1e081 | 1511 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1512 | { |
1513 | int ret; | |
1514 | pid_t pid; | |
94c55f17 | 1515 | const char *consumer_to_use; |
53086306 | 1516 | const char *verbosity; |
94c55f17 | 1517 | struct stat st; |
8c0faa1d | 1518 | |
3bd1e081 | 1519 | DBG("Spawning consumerd"); |
c49dc785 | 1520 | |
8c0faa1d DG |
1521 | pid = fork(); |
1522 | if (pid == 0) { | |
1523 | /* | |
3bd1e081 | 1524 | * Exec consumerd. |
8c0faa1d | 1525 | */ |
daee5345 | 1526 | if (opt_verbose_consumer) { |
53086306 DG |
1527 | verbosity = "--verbose"; |
1528 | } else { | |
1529 | verbosity = "--quiet"; | |
1530 | } | |
3bd1e081 MD |
1531 | switch (consumer_data->type) { |
1532 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1533 | /* |
f806231f MD |
1534 | * Find out which consumerd to execute. We will |
1535 | * first try the 64-bit path, then the | |
1536 | * sessiond's installation directory, and | |
1537 | * fallback on the 32-bit one, | |
94c55f17 | 1538 | */ |
63a799e8 AM |
1539 | DBG3("Looking for a kernel consumer at these locations:"); |
1540 | DBG3(" 1) %s", consumerd64_bin); | |
1541 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1542 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1543 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1544 | DBG3("Found location #1"); |
94c55f17 | 1545 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1546 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1547 | DBG3("Found location #2"); |
94c55f17 | 1548 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1549 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1550 | DBG3("Found location #3"); |
eb1e0bd4 | 1551 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1552 | } else { |
63a799e8 | 1553 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1554 | break; |
1555 | } | |
1556 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1557 | execl(consumer_to_use, | |
1558 | "lttng-consumerd", verbosity, "-k", | |
1559 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1560 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1561 | NULL); | |
3bd1e081 | 1562 | break; |
7753dea8 MD |
1563 | case LTTNG_CONSUMER64_UST: |
1564 | { | |
b1e0b6b6 | 1565 | char *tmpnew = NULL; |
8f4905da MD |
1566 | |
1567 | if (consumerd64_libdir[0] != '\0') { | |
1568 | char *tmp; | |
1569 | size_t tmplen; | |
1570 | ||
1571 | tmp = getenv("LD_LIBRARY_PATH"); | |
1572 | if (!tmp) { | |
1573 | tmp = ""; | |
1574 | } | |
1575 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1576 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1577 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1578 | if (!tmpnew) { | |
1579 | ret = -ENOMEM; | |
1580 | goto error; | |
1581 | } | |
1582 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1583 | strcat(tmpnew, consumerd64_libdir); | |
1584 | if (tmp[0] != '\0') { | |
1585 | strcat(tmpnew, ":"); | |
1586 | strcat(tmpnew, tmp); | |
1587 | } | |
1588 | ret = putenv(tmpnew); | |
1589 | if (ret) { | |
1590 | ret = -errno; | |
1591 | goto error; | |
1592 | } | |
1593 | } | |
94c55f17 | 1594 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1595 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1596 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1597 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1598 | NULL); | |
8f4905da MD |
1599 | if (consumerd64_libdir[0] != '\0') { |
1600 | free(tmpnew); | |
1601 | } | |
1602 | if (ret) { | |
1603 | goto error; | |
1604 | } | |
3bd1e081 | 1605 | break; |
7753dea8 MD |
1606 | } |
1607 | case LTTNG_CONSUMER32_UST: | |
1608 | { | |
937dde8e | 1609 | char *tmpnew = NULL; |
8f4905da MD |
1610 | |
1611 | if (consumerd32_libdir[0] != '\0') { | |
1612 | char *tmp; | |
1613 | size_t tmplen; | |
1614 | ||
1615 | tmp = getenv("LD_LIBRARY_PATH"); | |
1616 | if (!tmp) { | |
1617 | tmp = ""; | |
1618 | } | |
1619 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1620 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1621 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1622 | if (!tmpnew) { | |
1623 | ret = -ENOMEM; | |
1624 | goto error; | |
1625 | } | |
1626 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1627 | strcat(tmpnew, consumerd32_libdir); | |
1628 | if (tmp[0] != '\0') { | |
1629 | strcat(tmpnew, ":"); | |
1630 | strcat(tmpnew, tmp); | |
1631 | } | |
1632 | ret = putenv(tmpnew); | |
1633 | if (ret) { | |
1634 | ret = -errno; | |
1635 | goto error; | |
1636 | } | |
1637 | } | |
94c55f17 | 1638 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1639 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1640 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1641 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1642 | NULL); | |
8f4905da MD |
1643 | if (consumerd32_libdir[0] != '\0') { |
1644 | free(tmpnew); | |
1645 | } | |
1646 | if (ret) { | |
1647 | goto error; | |
1648 | } | |
7753dea8 MD |
1649 | break; |
1650 | } | |
3bd1e081 MD |
1651 | default: |
1652 | perror("unknown consumer type"); | |
1653 | exit(EXIT_FAILURE); | |
1654 | } | |
8c0faa1d DG |
1655 | if (errno != 0) { |
1656 | perror("kernel start consumer exec"); | |
1657 | } | |
1658 | exit(EXIT_FAILURE); | |
1659 | } else if (pid > 0) { | |
1660 | ret = pid; | |
8c0faa1d | 1661 | } else { |
3bd1e081 | 1662 | perror("start consumer fork"); |
8c0faa1d | 1663 | ret = -errno; |
8c0faa1d | 1664 | } |
8f4905da | 1665 | error: |
8c0faa1d DG |
1666 | return ret; |
1667 | } | |
1668 | ||
693bd40b | 1669 | /* |
3bd1e081 | 1670 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1671 | */ |
3bd1e081 | 1672 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1673 | { |
1674 | int ret; | |
1675 | ||
3bd1e081 MD |
1676 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1677 | if (consumer_data->pid != 0) { | |
1678 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1679 | goto end; |
1680 | } | |
693bd40b | 1681 | |
3bd1e081 | 1682 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1683 | if (ret < 0) { |
3bd1e081 MD |
1684 | ERR("Spawning consumerd failed"); |
1685 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1686 | goto error; |
693bd40b | 1687 | } |
c49dc785 | 1688 | |
3bd1e081 MD |
1689 | /* Setting up the consumer_data pid */ |
1690 | consumer_data->pid = ret; | |
48842b30 | 1691 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1692 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1693 | |
3bd1e081 MD |
1694 | DBG2("Spawning consumer control thread"); |
1695 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1696 | if (ret < 0) { |
3bd1e081 | 1697 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1698 | goto error; |
1699 | } | |
1700 | ||
c49dc785 | 1701 | end: |
693bd40b DG |
1702 | return 0; |
1703 | ||
1704 | error: | |
1705 | return ret; | |
1706 | } | |
1707 | ||
b73401da | 1708 | /* |
d063d709 | 1709 | * modprobe_kernel_modules |
b73401da DG |
1710 | */ |
1711 | static int modprobe_kernel_modules(void) | |
1712 | { | |
ab147185 | 1713 | int ret = 0, i; |
b73401da DG |
1714 | char modprobe[256]; |
1715 | ||
ab147185 MD |
1716 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1717 | ret = snprintf(modprobe, sizeof(modprobe), | |
1718 | "/sbin/modprobe %s%s", | |
24b487b8 | 1719 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1720 | kernel_modules_list[i].name); |
b73401da DG |
1721 | if (ret < 0) { |
1722 | perror("snprintf modprobe"); | |
1723 | goto error; | |
1724 | } | |
ab147185 | 1725 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1726 | ret = system(modprobe); |
ab147185 MD |
1727 | if (ret == -1) { |
1728 | ERR("Unable to launch modprobe for module %s", | |
1729 | kernel_modules_list[i].name); | |
1730 | } else if (kernel_modules_list[i].required | |
d9800920 | 1731 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1732 | ERR("Unable to load module %s", |
1733 | kernel_modules_list[i].name); | |
1734 | } else { | |
1735 | DBG("Modprobe successfully %s", | |
1736 | kernel_modules_list[i].name); | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | error: | |
1741 | return ret; | |
1742 | } | |
1743 | ||
b73401da | 1744 | /* |
d063d709 | 1745 | * mount_debugfs |
b73401da DG |
1746 | */ |
1747 | static int mount_debugfs(char *path) | |
1748 | { | |
1749 | int ret; | |
1750 | char *type = "debugfs"; | |
1751 | ||
e11d277b | 1752 | ret = run_as_mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1753 | if (ret < 0) { |
7272acf5 | 1754 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1755 | goto error; |
1756 | } | |
1757 | ||
1758 | ret = mount(type, path, type, 0, NULL); | |
1759 | if (ret < 0) { | |
7272acf5 | 1760 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1761 | goto error; |
1762 | } | |
1763 | ||
1764 | DBG("Mounted debugfs successfully at %s", path); | |
1765 | ||
1766 | error: | |
1767 | return ret; | |
1768 | } | |
1769 | ||
8c0faa1d | 1770 | /* |
d063d709 | 1771 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1772 | */ |
f3ed775e | 1773 | static void init_kernel_tracer(void) |
8c0faa1d | 1774 | { |
b73401da DG |
1775 | int ret; |
1776 | char *proc_mounts = "/proc/mounts"; | |
1777 | char line[256]; | |
684d34d2 | 1778 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1779 | FILE *fp; |
1780 | ||
1781 | /* Detect debugfs */ | |
1782 | fp = fopen(proc_mounts, "r"); | |
1783 | if (fp == NULL) { | |
1784 | ERR("Unable to probe %s", proc_mounts); | |
1785 | goto error; | |
1786 | } | |
1787 | ||
1788 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1789 | if (strstr(line, "debugfs") != NULL) { | |
1790 | /* Remove first string */ | |
1791 | strtok(line, " "); | |
1792 | /* Dup string here so we can reuse line later on */ | |
1793 | debugfs_path = strdup(strtok(NULL, " ")); | |
1794 | DBG("Got debugfs path : %s", debugfs_path); | |
1795 | break; | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | fclose(fp); | |
1800 | ||
1801 | /* Mount debugfs if needded */ | |
1802 | if (debugfs_path == NULL) { | |
1803 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1804 | if (ret < 0) { | |
1805 | perror("asprintf debugfs path"); | |
1806 | goto error; | |
1807 | } | |
1808 | ret = mount_debugfs(debugfs_path); | |
1809 | if (ret < 0) { | |
7272acf5 | 1810 | perror("Cannot mount debugfs"); |
b73401da DG |
1811 | goto error; |
1812 | } | |
1813 | } | |
1814 | ||
1815 | /* Modprobe lttng kernel modules */ | |
1816 | ret = modprobe_kernel_modules(); | |
1817 | if (ret < 0) { | |
1818 | goto error; | |
1819 | } | |
1820 | ||
1821 | /* Setup lttng kernel path */ | |
1822 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1823 | if (ret < 0) { | |
1824 | perror("asprintf lttng path"); | |
1825 | goto error; | |
1826 | } | |
1827 | ||
1828 | /* Open debugfs lttng */ | |
1829 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1830 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1831 | DBG("Failed to open %s", lttng_path); |
1832 | goto error; | |
8c0faa1d DG |
1833 | } |
1834 | ||
b73401da DG |
1835 | free(lttng_path); |
1836 | free(debugfs_path); | |
f3ed775e | 1837 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1838 | return; |
1839 | ||
1840 | error: | |
1841 | if (lttng_path) { | |
1842 | free(lttng_path); | |
1843 | } | |
1844 | if (debugfs_path) { | |
1845 | free(debugfs_path); | |
1846 | } | |
1847 | WARN("No kernel tracer available"); | |
1848 | kernel_tracer_fd = 0; | |
1849 | return; | |
f3ed775e | 1850 | } |
33a2b854 | 1851 | |
f3ed775e | 1852 | /* |
54d01ffb | 1853 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1854 | */ |
54d01ffb | 1855 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1856 | { |
f40799e8 | 1857 | int ret = 0; |
8c0faa1d | 1858 | |
3bd1e081 | 1859 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1860 | /* |
54d01ffb DG |
1861 | * Assign default kernel consumer socket if no consumer assigned to the |
1862 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1863 | * an extra security check. | |
d9800920 DG |
1864 | */ |
1865 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1866 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1867 | } |
1868 | ||
2bdd86d4 | 1869 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1870 | if (ret < 0) { |
f3ed775e DG |
1871 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1872 | goto error; | |
1873 | } | |
1d4b027a | 1874 | |
3bd1e081 | 1875 | session->consumer_fds_sent = 1; |
f3ed775e | 1876 | } |
1d4b027a DG |
1877 | |
1878 | error: | |
1879 | return ret; | |
8c0faa1d DG |
1880 | } |
1881 | ||
0177d773 DG |
1882 | /* |
1883 | * Create an UST session and add it to the session ust list. | |
1884 | */ | |
44d3bd01 | 1885 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1886 | struct lttng_domain *domain) |
0177d773 | 1887 | { |
13384287 | 1888 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1889 | int ret; |
44d3bd01 DG |
1890 | |
1891 | switch (domain->type) { | |
48842b30 | 1892 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1893 | break; |
1894 | default: | |
13384287 | 1895 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1896 | goto error; |
1897 | } | |
0177d773 DG |
1898 | |
1899 | DBG("Creating UST session"); | |
1900 | ||
a991f516 | 1901 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1902 | if (lus == NULL) { |
44d3bd01 | 1903 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1904 | goto error; |
1905 | } | |
1906 | ||
e11d277b | 1907 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1908 | session->uid, session->gid); |
0177d773 DG |
1909 | if (ret < 0) { |
1910 | if (ret != -EEXIST) { | |
1911 | ERR("Trace directory creation error"); | |
44d3bd01 | 1912 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1913 | goto error; |
1914 | } | |
1915 | } | |
1916 | ||
f6a9efaa DG |
1917 | /* The domain type dictate different actions on session creation */ |
1918 | switch (domain->type) { | |
48842b30 DG |
1919 | case LTTNG_DOMAIN_UST: |
1920 | /* No ustctl for the global UST domain */ | |
1921 | break; | |
1922 | default: | |
36dc12cc | 1923 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1924 | goto error; |
0177d773 | 1925 | } |
6df2e2c9 MD |
1926 | lus->uid = session->uid; |
1927 | lus->gid = session->gid; | |
f6a9efaa | 1928 | session->ust_session = lus; |
44d3bd01 DG |
1929 | |
1930 | return LTTCOMM_OK; | |
0177d773 DG |
1931 | |
1932 | error: | |
1933 | free(lus); | |
1934 | return ret; | |
1935 | } | |
1936 | ||
333f285e | 1937 | /* |
d063d709 | 1938 | * Create a kernel tracer session then create the default channel. |
333f285e | 1939 | */ |
6df2e2c9 | 1940 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1941 | { |
f3ed775e | 1942 | int ret; |
f3ed775e DG |
1943 | |
1944 | DBG("Creating kernel session"); | |
1945 | ||
1946 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1947 | if (ret < 0) { | |
1948 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1949 | goto error; | |
333f285e DG |
1950 | } |
1951 | ||
d9800920 | 1952 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1953 | if (kconsumer_data.cmd_sock) { |
1954 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1955 | } |
1956 | ||
e11d277b | 1957 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1958 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1959 | if (ret < 0) { |
996b65c8 | 1960 | if (ret != -EEXIST) { |
7a485870 DG |
1961 | ERR("Trace directory creation error"); |
1962 | goto error; | |
1963 | } | |
1964 | } | |
6df2e2c9 MD |
1965 | session->kernel_session->uid = session->uid; |
1966 | session->kernel_session->gid = session->gid; | |
7a485870 | 1967 | |
f3ed775e DG |
1968 | error: |
1969 | return ret; | |
333f285e DG |
1970 | } |
1971 | ||
8e0af1b4 MD |
1972 | /* |
1973 | * Check if the UID or GID match the session. Root user has access to | |
1974 | * all sessions. | |
1975 | */ | |
1976 | static int session_access_ok(struct ltt_session *session, | |
1977 | uid_t uid, gid_t gid) | |
1978 | { | |
1979 | if (uid != session->uid && gid != session->gid | |
1980 | && uid != 0) { | |
1981 | return 0; | |
1982 | } else { | |
1983 | return 1; | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1988 | { | |
1989 | unsigned int i = 0; | |
1990 | struct ltt_session *session; | |
1991 | ||
1992 | DBG("Counting number of available session for UID %d GID %d", | |
1993 | uid, gid); | |
1994 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1995 | /* | |
1996 | * Only list the sessions the user can control. | |
1997 | */ | |
1998 | if (!session_access_ok(session, uid, gid)) { | |
1999 | continue; | |
2000 | } | |
2001 | i++; | |
2002 | } | |
2003 | return i; | |
2004 | } | |
2005 | ||
6c9cc2ab DG |
2006 | /* |
2007 | * Using the session list, filled a lttng_session array to send back to the | |
2008 | * client for session listing. | |
2009 | * | |
2010 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2011 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2012 | */ |
8e0af1b4 MD |
2013 | static void list_lttng_sessions(struct lttng_session *sessions, |
2014 | uid_t uid, gid_t gid) | |
6c9cc2ab | 2015 | { |
8e0af1b4 | 2016 | unsigned int i = 0; |
6c9cc2ab DG |
2017 | struct ltt_session *session; |
2018 | ||
8e0af1b4 MD |
2019 | DBG("Getting all available session for UID %d GID %d", |
2020 | uid, gid); | |
6c9cc2ab DG |
2021 | /* |
2022 | * Iterate over session list and append data after the control struct in | |
2023 | * the buffer. | |
2024 | */ | |
2025 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2026 | /* |
2027 | * Only list the sessions the user can control. | |
2028 | */ | |
2029 | if (!session_access_ok(session, uid, gid)) { | |
2030 | continue; | |
2031 | } | |
6c9cc2ab | 2032 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2033 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2034 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2035 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2036 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2037 | i++; |
2038 | } | |
2039 | } | |
2040 | ||
9f19cc17 DG |
2041 | /* |
2042 | * Fill lttng_channel array of all channels. | |
2043 | */ | |
b551a063 | 2044 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2045 | struct lttng_channel *channels) |
2046 | { | |
2047 | int i = 0; | |
2048 | struct ltt_kernel_channel *kchan; | |
2049 | ||
2050 | DBG("Listing channels for session %s", session->name); | |
2051 | ||
b551a063 DG |
2052 | switch (domain) { |
2053 | case LTTNG_DOMAIN_KERNEL: | |
2054 | /* Kernel channels */ | |
2055 | if (session->kernel_session != NULL) { | |
2056 | cds_list_for_each_entry(kchan, | |
2057 | &session->kernel_session->channel_list.head, list) { | |
2058 | /* Copy lttng_channel struct to array */ | |
2059 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2060 | channels[i].enabled = kchan->enabled; | |
2061 | i++; | |
2062 | } | |
2063 | } | |
2064 | break; | |
2065 | case LTTNG_DOMAIN_UST: | |
2066 | { | |
bec39940 | 2067 | struct lttng_ht_iter iter; |
b551a063 DG |
2068 | struct ltt_ust_channel *uchan; |
2069 | ||
bec39940 DG |
2070 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2071 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2072 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2073 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2074 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2075 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2076 | channels[i].attr.switch_timer_interval = | |
2077 | uchan->attr.switch_timer_interval; | |
2078 | channels[i].attr.read_timer_interval = | |
2079 | uchan->attr.read_timer_interval; | |
aea829b3 | 2080 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2081 | switch (uchan->attr.output) { |
2082 | case LTTNG_UST_MMAP: | |
2083 | default: | |
2084 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2085 | break; | |
2086 | } | |
befe0905 | 2087 | i++; |
b551a063 DG |
2088 | } |
2089 | break; | |
2090 | } | |
2091 | default: | |
2092 | break; | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * Create a list of ust global domain events. | |
2098 | */ | |
2099 | static int list_lttng_ust_global_events(char *channel_name, | |
2100 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2101 | { | |
2102 | int i = 0, ret = 0; | |
2103 | unsigned int nb_event = 0; | |
bec39940 DG |
2104 | struct lttng_ht_iter iter; |
2105 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2106 | struct ltt_ust_channel *uchan; |
2107 | struct ltt_ust_event *uevent; | |
2108 | struct lttng_event *tmp; | |
2109 | ||
2110 | DBG("Listing UST global events for channel %s", channel_name); | |
2111 | ||
2112 | rcu_read_lock(); | |
2113 | ||
bec39940 DG |
2114 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2115 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2116 | if (node == NULL) { |
2117 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2118 | goto error; | |
b551a063 DG |
2119 | } |
2120 | ||
bec39940 | 2121 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2122 | |
bec39940 | 2123 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2124 | |
b551a063 DG |
2125 | if (nb_event == 0) { |
2126 | ret = nb_event; | |
2127 | goto error; | |
2128 | } | |
2129 | ||
2130 | DBG3("Listing UST global %d events", nb_event); | |
2131 | ||
2132 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2133 | if (tmp == NULL) { | |
2134 | ret = -LTTCOMM_FATAL; | |
2135 | goto error; | |
2136 | } | |
2137 | ||
bec39940 | 2138 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2139 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2140 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2141 | tmp[i].enabled = uevent->enabled; | |
2142 | switch (uevent->attr.instrumentation) { | |
2143 | case LTTNG_UST_TRACEPOINT: | |
2144 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2145 | break; | |
2146 | case LTTNG_UST_PROBE: | |
2147 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2148 | break; | |
2149 | case LTTNG_UST_FUNCTION: | |
2150 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2151 | break; | |
ac3bd9c0 | 2152 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2153 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2154 | break; |
9f19cc17 | 2155 | } |
d7b75b30 | 2156 | i++; |
9f19cc17 DG |
2157 | } |
2158 | ||
b551a063 DG |
2159 | ret = nb_event; |
2160 | *events = tmp; | |
2161 | ||
2162 | error: | |
2163 | rcu_read_unlock(); | |
2164 | return ret; | |
9f19cc17 DG |
2165 | } |
2166 | ||
2167 | /* | |
b551a063 | 2168 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2169 | */ |
b551a063 DG |
2170 | static int list_lttng_kernel_events(char *channel_name, |
2171 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2172 | { |
b551a063 DG |
2173 | int i = 0, ret; |
2174 | unsigned int nb_event; | |
9f19cc17 | 2175 | struct ltt_kernel_event *event; |
b551a063 DG |
2176 | struct ltt_kernel_channel *kchan; |
2177 | ||
2178 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2179 | if (kchan == NULL) { | |
2180 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2181 | goto error; | |
2182 | } | |
2183 | ||
2184 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2185 | |
2186 | DBG("Listing events for channel %s", kchan->channel->name); | |
2187 | ||
b551a063 DG |
2188 | if (nb_event == 0) { |
2189 | ret = nb_event; | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2194 | if (*events == NULL) { | |
2195 | ret = LTTCOMM_FATAL; | |
2196 | goto error; | |
2197 | } | |
2198 | ||
9f19cc17 DG |
2199 | /* Kernel channels */ |
2200 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2201 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2202 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2203 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2204 | switch (event->event->instrumentation) { |
2205 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2206 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2207 | break; |
2208 | case LTTNG_KERNEL_KPROBE: | |
2209 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2210 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2211 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2212 | sizeof(struct lttng_kernel_kprobe)); |
2213 | break; | |
2214 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2215 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2216 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2217 | sizeof(struct lttng_kernel_function)); |
2218 | break; | |
0133c199 | 2219 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2220 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2221 | break; |
a54bd42d | 2222 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2223 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2224 | break; |
7a3d1328 MD |
2225 | case LTTNG_KERNEL_ALL: |
2226 | assert(0); | |
2227 | break; | |
9f19cc17 DG |
2228 | } |
2229 | i++; | |
2230 | } | |
b551a063 DG |
2231 | |
2232 | return nb_event; | |
2233 | ||
2234 | error: | |
2235 | return ret; | |
9f19cc17 DG |
2236 | } |
2237 | ||
fac6795d | 2238 | /* |
54d01ffb | 2239 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2240 | */ |
54d01ffb DG |
2241 | static int cmd_disable_channel(struct ltt_session *session, |
2242 | int domain, char *channel_name) | |
fac6795d | 2243 | { |
54d01ffb | 2244 | int ret; |
78f0bacd DG |
2245 | struct ltt_ust_session *usess; |
2246 | ||
2247 | usess = session->ust_session; | |
379473d2 | 2248 | |
54d01ffb | 2249 | switch (domain) { |
78f0bacd DG |
2250 | case LTTNG_DOMAIN_KERNEL: |
2251 | { | |
2252 | ret = channel_kernel_disable(session->kernel_session, | |
2253 | channel_name); | |
2254 | if (ret != LTTCOMM_OK) { | |
2255 | goto error; | |
2256 | } | |
54d01ffb | 2257 | |
78f0bacd DG |
2258 | kernel_wait_quiescent(kernel_tracer_fd); |
2259 | break; | |
2260 | } | |
2261 | case LTTNG_DOMAIN_UST: | |
2262 | { | |
2263 | struct ltt_ust_channel *uchan; | |
bec39940 | 2264 | struct lttng_ht *chan_ht; |
78f0bacd | 2265 | |
7885e399 DG |
2266 | chan_ht = usess->domain_global.channels; |
2267 | ||
2268 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2269 | if (uchan == NULL) { |
2270 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2271 | goto error; |
78f0bacd DG |
2272 | } |
2273 | ||
7885e399 DG |
2274 | ret = channel_ust_disable(usess, domain, uchan); |
2275 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2276 | goto error; |
2277 | } | |
78f0bacd DG |
2278 | break; |
2279 | } | |
2280 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2281 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2282 | case LTTNG_DOMAIN_UST_PID: | |
2283 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2284 | goto error; | |
2285 | default: | |
2286 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2287 | goto error; | |
20fe2104 DG |
2288 | } |
2289 | ||
54d01ffb | 2290 | ret = LTTCOMM_OK; |
d65106b1 | 2291 | |
54d01ffb DG |
2292 | error: |
2293 | return ret; | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2298 | */ | |
44d3bd01 | 2299 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2300 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2301 | { |
2302 | int ret; | |
f6a9efaa | 2303 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2304 | struct lttng_ht *chan_ht; |
f6a9efaa | 2305 | |
5d56b5aa | 2306 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2307 | |
aea829b3 | 2308 | switch (domain) { |
44d3bd01 DG |
2309 | case LTTNG_DOMAIN_KERNEL: |
2310 | { | |
2311 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2312 | |
44d3bd01 DG |
2313 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2314 | session->kernel_session); | |
2315 | if (kchan == NULL) { | |
2316 | ret = channel_kernel_create(session->kernel_session, | |
2317 | attr, kernel_poll_pipe[1]); | |
2318 | } else { | |
2319 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2320 | } | |
2321 | ||
2322 | if (ret != LTTCOMM_OK) { | |
2323 | goto error; | |
2324 | } | |
2325 | ||
2326 | kernel_wait_quiescent(kernel_tracer_fd); | |
2327 | break; | |
2328 | } | |
f6a9efaa DG |
2329 | case LTTNG_DOMAIN_UST: |
2330 | { | |
2331 | struct ltt_ust_channel *uchan; | |
2332 | ||
7885e399 | 2333 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2334 | |
7885e399 | 2335 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2336 | if (uchan == NULL) { |
7885e399 | 2337 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2338 | } else { |
7885e399 | 2339 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2340 | } |
f6a9efaa DG |
2341 | break; |
2342 | } | |
78f0bacd DG |
2343 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2344 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2345 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2346 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2347 | goto error; | |
44d3bd01 DG |
2348 | default: |
2349 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2350 | goto error; | |
54d01ffb DG |
2351 | } |
2352 | ||
54d01ffb DG |
2353 | error: |
2354 | return ret; | |
2355 | } | |
2356 | ||
2357 | /* | |
2358 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2359 | */ | |
2360 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2361 | char *channel_name, char *event_name) | |
2362 | { | |
2363 | int ret; | |
54d01ffb DG |
2364 | |
2365 | switch (domain) { | |
2366 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2367 | { |
2368 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2369 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2370 | |
b0a40d28 DG |
2371 | ksess = session->kernel_session; |
2372 | ||
2373 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2374 | if (kchan == NULL) { |
2375 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2376 | goto error; | |
d65106b1 DG |
2377 | } |
2378 | ||
b0a40d28 | 2379 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2380 | if (ret != LTTCOMM_OK) { |
2381 | goto error; | |
2382 | } | |
2383 | ||
2384 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2385 | break; |
2bdd86d4 MD |
2386 | } |
2387 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2388 | { |
b0a40d28 | 2389 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2390 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2391 | |
2392 | usess = session->ust_session; | |
2393 | ||
2394 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2395 | channel_name); | |
2396 | if (uchan == NULL) { | |
2397 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2398 | goto error; | |
2399 | } | |
2400 | ||
7f79d3a1 DG |
2401 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2402 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2403 | goto error; |
2404 | } | |
2405 | ||
7f79d3a1 | 2406 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2407 | channel_name); |
b0a40d28 DG |
2408 | break; |
2409 | } | |
2bdd86d4 MD |
2410 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2411 | case LTTNG_DOMAIN_UST_PID: | |
2412 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2413 | default: |
54d01ffb DG |
2414 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2415 | goto error; | |
d65106b1 | 2416 | } |
26cc6b4e | 2417 | |
54d01ffb DG |
2418 | ret = LTTCOMM_OK; |
2419 | ||
2420 | error: | |
2421 | return ret; | |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2426 | */ | |
2427 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2428 | char *channel_name) | |
2429 | { | |
2430 | int ret; | |
54d01ffb DG |
2431 | |
2432 | switch (domain) { | |
2433 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2434 | { |
2435 | struct ltt_kernel_session *ksess; | |
2436 | struct ltt_kernel_channel *kchan; | |
2437 | ||
2438 | ksess = session->kernel_session; | |
2439 | ||
2440 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2441 | if (kchan == NULL) { |
2442 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2443 | goto error; | |
26cc6b4e DG |
2444 | } |
2445 | ||
9730260e | 2446 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2447 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2448 | goto error; |
26cc6b4e DG |
2449 | } |
2450 | ||
54d01ffb | 2451 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2452 | break; |
9730260e DG |
2453 | } |
2454 | case LTTNG_DOMAIN_UST: | |
2455 | { | |
2456 | struct ltt_ust_session *usess; | |
2457 | struct ltt_ust_channel *uchan; | |
2458 | ||
2459 | usess = session->ust_session; | |
2460 | ||
2461 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2462 | channel_name); | |
2463 | if (uchan == NULL) { | |
2464 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2465 | goto error; | |
2466 | } | |
2467 | ||
7f79d3a1 DG |
2468 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2469 | if (ret != 0) { | |
9730260e DG |
2470 | goto error; |
2471 | } | |
2472 | ||
7f79d3a1 | 2473 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2474 | |
2475 | break; | |
2476 | } | |
2477 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2478 | case LTTNG_DOMAIN_UST_PID: | |
2479 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2480 | default: |
54d01ffb DG |
2481 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2482 | goto error; | |
26cc6b4e | 2483 | } |
e953ef25 | 2484 | |
54d01ffb | 2485 | ret = LTTCOMM_OK; |
e953ef25 | 2486 | |
54d01ffb DG |
2487 | error: |
2488 | return ret; | |
2489 | } | |
f5177a38 | 2490 | |
54d01ffb DG |
2491 | /* |
2492 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2493 | */ | |
2494 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2495 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2496 | { | |
2497 | int ret; | |
f5177a38 | 2498 | |
54d01ffb DG |
2499 | switch (domain) { |
2500 | case LTTNG_DOMAIN_KERNEL: | |
2501 | /* Add kernel context to kernel tracer */ | |
2502 | ret = context_kernel_add(session->kernel_session, ctx, | |
2503 | event_name, channel_name); | |
2504 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2505 | goto error; |
e953ef25 | 2506 | } |
2bdd86d4 MD |
2507 | break; |
2508 | case LTTNG_DOMAIN_UST: | |
2509 | { | |
55cc08a6 | 2510 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2511 | |
55cc08a6 DG |
2512 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2513 | if (ret != LTTCOMM_OK) { | |
2514 | goto error; | |
2bdd86d4 | 2515 | } |
e953ef25 | 2516 | break; |
2bdd86d4 | 2517 | } |
55cc08a6 DG |
2518 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2519 | case LTTNG_DOMAIN_UST_PID: | |
2520 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2521 | default: |
54d01ffb DG |
2522 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2523 | goto error; | |
e953ef25 | 2524 | } |
950131af | 2525 | |
54d01ffb | 2526 | ret = LTTCOMM_OK; |
950131af | 2527 | |
54d01ffb DG |
2528 | error: |
2529 | return ret; | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2534 | * |
2535 | * TODO: currently, both events and loglevels are kept within the same | |
2536 | * namespace for UST global registry/app registery, so if an event | |
2537 | * happen to have the same name as the loglevel (very unlikely though), | |
2538 | * and an attempt is made to enable/disable both in the same session, | |
2539 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2540 | */ |
2541 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2542 | char *channel_name, struct lttng_event *event) | |
2543 | { | |
2544 | int ret; | |
f6cd6b0f | 2545 | struct lttng_channel *attr; |
48842b30 | 2546 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2547 | |
2548 | switch (domain) { | |
2549 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2550 | { |
2551 | struct ltt_kernel_channel *kchan; | |
2552 | ||
54d01ffb DG |
2553 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2554 | session->kernel_session); | |
2555 | if (kchan == NULL) { | |
f6cd6b0f DG |
2556 | attr = channel_new_default_attr(domain); |
2557 | if (attr == NULL) { | |
2558 | ret = LTTCOMM_FATAL; | |
2559 | goto error; | |
2560 | } | |
2561 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2562 | ||
54d01ffb | 2563 | /* This call will notify the kernel thread */ |
44d3bd01 | 2564 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2565 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2566 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2567 | free(attr); |
f5177a38 DG |
2568 | goto error; |
2569 | } | |
ff4d74e6 | 2570 | free(attr); |
54d01ffb | 2571 | } |
950131af | 2572 | |
54d01ffb DG |
2573 | /* Get the newly created kernel channel pointer */ |
2574 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2575 | session->kernel_session); | |
2576 | if (kchan == NULL) { | |
2577 | /* This sould not happen... */ | |
2578 | ret = LTTCOMM_FATAL; | |
2579 | goto error; | |
2580 | } | |
f5177a38 | 2581 | |
48842b30 DG |
2582 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2583 | event); | |
54d01ffb | 2584 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2585 | goto error; |
950131af DG |
2586 | } |
2587 | ||
54d01ffb | 2588 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2589 | break; |
2bdd86d4 MD |
2590 | } |
2591 | case LTTNG_DOMAIN_UST: | |
2592 | { | |
aea829b3 | 2593 | struct lttng_channel *attr; |
edb67388 | 2594 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2595 | |
edb67388 | 2596 | /* Get channel from global UST domain */ |
48842b30 DG |
2597 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2598 | channel_name); | |
2599 | if (uchan == NULL) { | |
aea829b3 DG |
2600 | /* Create default channel */ |
2601 | attr = channel_new_default_attr(domain); | |
2602 | if (attr == NULL) { | |
2603 | ret = LTTCOMM_FATAL; | |
2604 | goto error; | |
2605 | } | |
596219f7 | 2606 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2607 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2608 | |
7885e399 | 2609 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2610 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2611 | free(attr); |
aea829b3 DG |
2612 | goto error; |
2613 | } | |
aea829b3 DG |
2614 | free(attr); |
2615 | ||
2616 | /* Get the newly created channel reference back */ | |
2617 | uchan = trace_ust_find_channel_by_name( | |
2618 | usess->domain_global.channels, channel_name); | |
2619 | if (uchan == NULL) { | |
2620 | /* Something is really wrong */ | |
2621 | ret = LTTCOMM_FATAL; | |
2622 | goto error; | |
2623 | } | |
48842b30 | 2624 | } |
2bdd86d4 | 2625 | |
edb67388 | 2626 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2627 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2628 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2629 | goto error; |
2bdd86d4 MD |
2630 | } |
2631 | break; | |
2632 | } | |
2633 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2634 | case LTTNG_DOMAIN_UST_PID: | |
2635 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2636 | default: |
54d01ffb DG |
2637 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2638 | goto error; | |
950131af | 2639 | } |
d36b8583 | 2640 | |
54d01ffb | 2641 | ret = LTTCOMM_OK; |
d36b8583 | 2642 | |
54d01ffb DG |
2643 | error: |
2644 | return ret; | |
2645 | } | |
7d29a247 | 2646 | |
54d01ffb DG |
2647 | /* |
2648 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2649 | */ | |
2650 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2651 | char *channel_name, int event_type) |
54d01ffb DG |
2652 | { |
2653 | int ret; | |
2654 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2655 | |
54d01ffb DG |
2656 | switch (domain) { |
2657 | case LTTNG_DOMAIN_KERNEL: | |
2658 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2659 | session->kernel_session); | |
2660 | if (kchan == NULL) { | |
2661 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2662 | ret = channel_kernel_create(session->kernel_session, NULL, |
2663 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2664 | if (ret != LTTCOMM_OK) { |
2665 | goto error; | |
d36b8583 | 2666 | } |
0d0c377a | 2667 | |
8f69e5eb DG |
2668 | /* Get the newly created kernel channel pointer */ |
2669 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2670 | session->kernel_session); | |
2671 | if (kchan == NULL) { | |
2672 | /* This sould not happen... */ | |
2673 | ret = LTTCOMM_FATAL; | |
2674 | goto error; | |
2675 | } | |
2676 | ||
54d01ffb | 2677 | } |
0fdd1e2c | 2678 | |
7a3d1328 | 2679 | switch (event_type) { |
76d45b40 | 2680 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2681 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2682 | kchan, kernel_tracer_fd); |
7a3d1328 | 2683 | break; |
76d45b40 | 2684 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2685 | /* |
7a3d1328 MD |
2686 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2687 | * events already registered to the channel. | |
8c9ae521 | 2688 | */ |
7a3d1328 MD |
2689 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2690 | kchan, kernel_tracer_fd); | |
2691 | break; | |
76d45b40 | 2692 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2693 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2694 | ret = event_kernel_enable_all(session->kernel_session, |
2695 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2696 | break; |
2697 | default: | |
2698 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2699 | goto error; | |
8c9ae521 | 2700 | } |
8f69e5eb DG |
2701 | |
2702 | /* Manage return value */ | |
54d01ffb | 2703 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2704 | goto error; |
d36b8583 DG |
2705 | } |
2706 | ||
54d01ffb | 2707 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2708 | break; |
76d45b40 DG |
2709 | case LTTNG_DOMAIN_UST: |
2710 | { | |
2711 | struct lttng_channel *attr; | |
2712 | struct ltt_ust_channel *uchan; | |
2713 | struct ltt_ust_session *usess = session->ust_session; | |
2714 | ||
2715 | /* Get channel from global UST domain */ | |
2716 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2717 | channel_name); | |
2718 | if (uchan == NULL) { | |
2719 | /* Create default channel */ | |
2720 | attr = channel_new_default_attr(domain); | |
2721 | if (attr == NULL) { | |
2722 | ret = LTTCOMM_FATAL; | |
2723 | goto error; | |
2724 | } | |
2725 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2726 | attr->name[NAME_MAX - 1] = '\0'; | |
2727 | ||
2728 | /* Use the internal command enable channel */ | |
7885e399 | 2729 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2730 | if (ret != LTTCOMM_OK) { |
2731 | free(attr); | |
2732 | goto error; | |
2733 | } | |
2734 | free(attr); | |
2735 | ||
2736 | /* Get the newly created channel reference back */ | |
2737 | uchan = trace_ust_find_channel_by_name( | |
2738 | usess->domain_global.channels, channel_name); | |
2739 | if (uchan == NULL) { | |
2740 | /* Something is really wrong */ | |
2741 | ret = LTTCOMM_FATAL; | |
2742 | goto error; | |
2743 | } | |
2744 | } | |
2745 | ||
2746 | /* At this point, the session and channel exist on the tracer */ | |
2747 | ||
2748 | switch (event_type) { | |
2749 | case LTTNG_EVENT_ALL: | |
2750 | case LTTNG_EVENT_TRACEPOINT: | |
2751 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2752 | if (ret != LTTCOMM_OK) { | |
2753 | goto error; | |
2754 | } | |
2755 | break; | |
2756 | default: | |
2757 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2758 | goto error; | |
2759 | } | |
2760 | ||
2761 | /* Manage return value */ | |
2762 | if (ret != LTTCOMM_OK) { | |
2763 | goto error; | |
2764 | } | |
2765 | ||
2766 | break; | |
2767 | } | |
2768 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2769 | case LTTNG_DOMAIN_UST_PID: | |
2770 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2771 | default: |
54d01ffb DG |
2772 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2773 | goto error; | |
d36b8583 | 2774 | } |
f3ed775e | 2775 | |
54d01ffb DG |
2776 | ret = LTTCOMM_OK; |
2777 | ||
2778 | error: | |
2779 | return ret; | |
2780 | } | |
2781 | ||
2782 | /* | |
2783 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2784 | */ | |
2785 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2786 | { | |
2787 | int ret; | |
2788 | ssize_t nb_events = 0; | |
2789 | ||
2790 | switch (domain) { | |
2791 | case LTTNG_DOMAIN_KERNEL: | |
2792 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2793 | if (nb_events < 0) { | |
2794 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2795 | goto error; | |
894be886 | 2796 | } |
54d01ffb | 2797 | break; |
b551a063 DG |
2798 | case LTTNG_DOMAIN_UST: |
2799 | nb_events = ust_app_list_events(events); | |
2800 | if (nb_events < 0) { | |
2801 | ret = LTTCOMM_UST_LIST_FAIL; | |
2802 | goto error; | |
2803 | } | |
2804 | break; | |
54d01ffb | 2805 | default: |
54d01ffb DG |
2806 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2807 | goto error; | |
2808 | } | |
894be886 | 2809 | |
54d01ffb | 2810 | return nb_events; |
7d29a247 | 2811 | |
54d01ffb DG |
2812 | error: |
2813 | /* Return negative value to differentiate return code */ | |
2814 | return -ret; | |
2815 | } | |
b389abbe | 2816 | |
54d01ffb DG |
2817 | /* |
2818 | * Command LTTNG_START_TRACE processed by the client thread. | |
2819 | */ | |
2820 | static int cmd_start_trace(struct ltt_session *session) | |
2821 | { | |
2822 | int ret; | |
54d01ffb | 2823 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2824 | struct ltt_ust_session *usess; |
b389abbe | 2825 | |
54d01ffb DG |
2826 | /* Short cut */ |
2827 | ksession = session->kernel_session; | |
b9d9b220 | 2828 | usess = session->ust_session; |
5eb91c98 | 2829 | |
b9ef1c83 DG |
2830 | if (session->enabled) { |
2831 | ret = LTTCOMM_UST_START_FAIL; | |
2832 | goto error; | |
2833 | } | |
2834 | ||
464dd62d MD |
2835 | session->enabled = 1; |
2836 | ||
54d01ffb DG |
2837 | /* Kernel tracing */ |
2838 | if (ksession != NULL) { | |
2bdd86d4 MD |
2839 | struct ltt_kernel_channel *kchan; |
2840 | ||
54d01ffb DG |
2841 | /* Open kernel metadata */ |
2842 | if (ksession->metadata == NULL) { | |
2843 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2844 | if (ret < 0) { | |
2845 | ret = LTTCOMM_KERN_META_FAIL; | |
2846 | goto error; | |
b389abbe | 2847 | } |
54d01ffb | 2848 | } |
7d29a247 | 2849 | |
54d01ffb DG |
2850 | /* Open kernel metadata stream */ |
2851 | if (ksession->metadata_stream_fd == 0) { | |
2852 | ret = kernel_open_metadata_stream(ksession); | |
2853 | if (ret < 0) { | |
2854 | ERR("Kernel create metadata stream failed"); | |
2855 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2856 | goto error; | |
2857 | } | |
2858 | } | |
2859 | ||
2860 | /* For each channel */ | |
2861 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2862 | if (kchan->stream_count == 0) { | |
2863 | ret = kernel_open_channel_stream(kchan); | |
2864 | if (ret < 0) { | |
2865 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2866 | goto error; |
2867 | } | |
54d01ffb DG |
2868 | /* Update the stream global counter */ |
2869 | ksession->stream_count_global += ret; | |
7d29a247 | 2870 | } |
54d01ffb DG |
2871 | } |
2872 | ||
2873 | /* Setup kernel consumer socket and send fds to it */ | |
2874 | ret = init_kernel_tracing(ksession); | |
2875 | if (ret < 0) { | |
2876 | ret = LTTCOMM_KERN_START_FAIL; | |
2877 | goto error; | |
2878 | } | |
2879 | ||
2880 | /* This start the kernel tracing */ | |
2881 | ret = kernel_start_session(ksession); | |
2882 | if (ret < 0) { | |
2883 | ret = LTTCOMM_KERN_START_FAIL; | |
2884 | goto error; | |
2885 | } | |
2886 | ||
2887 | /* Quiescent wait after starting trace */ | |
2888 | kernel_wait_quiescent(kernel_tracer_fd); | |
2889 | } | |
2890 | ||
36dc12cc | 2891 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2892 | if (usess) { |
2893 | usess->start_trace = 1; | |
36dc12cc | 2894 | |
b9d9b220 DG |
2895 | ret = ust_app_start_trace_all(usess); |
2896 | if (ret < 0) { | |
2897 | ret = LTTCOMM_UST_START_FAIL; | |
2898 | goto error; | |
2899 | } | |
2bdd86d4 | 2900 | } |
54d01ffb DG |
2901 | |
2902 | ret = LTTCOMM_OK; | |
2903 | ||
2904 | error: | |
2905 | return ret; | |
2906 | } | |
2907 | ||
2908 | /* | |
2909 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2910 | */ | |
2911 | static int cmd_stop_trace(struct ltt_session *session) | |
2912 | { | |
2913 | int ret; | |
2914 | struct ltt_kernel_channel *kchan; | |
2915 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2916 | struct ltt_ust_session *usess; |
54d01ffb DG |
2917 | |
2918 | /* Short cut */ | |
2919 | ksession = session->kernel_session; | |
8be98f9a | 2920 | usess = session->ust_session; |
54d01ffb | 2921 | |
b9ef1c83 | 2922 | if (!session->enabled) { |
190df5ac | 2923 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2924 | goto error; |
2925 | } | |
2926 | ||
464dd62d MD |
2927 | session->enabled = 0; |
2928 | ||
54d01ffb DG |
2929 | /* Kernel tracer */ |
2930 | if (ksession != NULL) { | |
2931 | DBG("Stop kernel tracing"); | |
2932 | ||
2933 | /* Flush all buffers before stopping */ | |
2934 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2935 | if (ret < 0) { | |
2936 | ERR("Kernel metadata flush failed"); | |
2937 | } | |
f34daff7 | 2938 | |
54d01ffb DG |
2939 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2940 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2941 | if (ret < 0) { |
54d01ffb | 2942 | ERR("Kernel flush buffer error"); |
7d29a247 | 2943 | } |
54d01ffb | 2944 | } |
19e70852 | 2945 | |
54d01ffb DG |
2946 | ret = kernel_stop_session(ksession); |
2947 | if (ret < 0) { | |
2948 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2949 | goto error; |
f3ed775e | 2950 | } |
54d01ffb DG |
2951 | |
2952 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2953 | } |
54d01ffb | 2954 | |
8be98f9a MD |
2955 | if (usess) { |
2956 | usess->start_trace = 0; | |
2bdd86d4 | 2957 | |
8be98f9a | 2958 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2959 | if (ret < 0) { |
190df5ac | 2960 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2961 | goto error; |
2962 | } | |
2bdd86d4 | 2963 | } |
54d01ffb DG |
2964 | |
2965 | ret = LTTCOMM_OK; | |
2966 | ||
2967 | error: | |
2968 | return ret; | |
2969 | } | |
2970 | ||
2971 | /* | |
2972 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2973 | */ | |
6df2e2c9 | 2974 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
2975 | { |
2976 | int ret; | |
2977 | ||
6df2e2c9 | 2978 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
2979 | if (ret != LTTCOMM_OK) { |
2980 | goto error; | |
2981 | } | |
2982 | ||
2983 | ret = LTTCOMM_OK; | |
2984 | ||
2985 | error: | |
2986 | return ret; | |
2987 | } | |
2988 | ||
2989 | /* | |
2990 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2991 | */ | |
2992 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2993 | { | |
2994 | int ret; | |
2995 | ||
2996 | /* Clean kernel session teardown */ | |
2997 | teardown_kernel_session(session); | |
84cd17c6 MD |
2998 | /* UST session teardown */ |
2999 | teardown_ust_session(session); | |
54d01ffb DG |
3000 | |
3001 | /* | |
3002 | * Must notify the kernel thread here to update it's poll setin order | |
3003 | * to remove the channel(s)' fd just destroyed. | |
3004 | */ | |
3005 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3006 | if (ret < 0) { | |
3007 | perror("write kernel poll pipe"); | |
3008 | } | |
3009 | ||
271933a4 | 3010 | ret = session_destroy(session); |
54d01ffb DG |
3011 | |
3012 | return ret; | |
3013 | } | |
3014 | ||
3015 | /* | |
3016 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3017 | */ | |
3018 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3019 | { | |
3020 | int ret; | |
3021 | ||
3022 | switch (domain) { | |
3023 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3024 | { |
54d01ffb | 3025 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3026 | |
54d01ffb DG |
3027 | kcalibrate.type = calibrate->type; |
3028 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3029 | if (ret < 0) { |
54d01ffb DG |
3030 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3031 | goto error; | |
33a2b854 | 3032 | } |
54d01ffb DG |
3033 | break; |
3034 | } | |
3035 | default: | |
3036 | /* TODO: Userspace tracing */ | |
3037 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3038 | goto error; | |
3039 | } | |
33a2b854 | 3040 | |
54d01ffb | 3041 | ret = LTTCOMM_OK; |
33a2b854 | 3042 | |
54d01ffb DG |
3043 | error: |
3044 | return ret; | |
3045 | } | |
7d29a247 | 3046 | |
54d01ffb DG |
3047 | /* |
3048 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3049 | */ | |
3050 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3051 | char *sock_path) | |
3052 | { | |
3053 | int ret, sock; | |
b389abbe | 3054 | |
54d01ffb DG |
3055 | switch (domain) { |
3056 | case LTTNG_DOMAIN_KERNEL: | |
3057 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3058 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3059 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3060 | goto error; | |
3061 | } | |
3062 | ||
3063 | sock = lttcomm_connect_unix_sock(sock_path); | |
3064 | if (sock < 0) { | |
3065 | ret = LTTCOMM_CONNECT_FAIL; | |
3066 | goto error; | |
3067 | } | |
3068 | ||
3069 | session->kernel_session->consumer_fd = sock; | |
3070 | break; | |
3071 | default: | |
3072 | /* TODO: Userspace tracing */ | |
3073 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3074 | goto error; | |
3075 | } | |
3076 | ||
3077 | ret = LTTCOMM_OK; | |
3078 | ||
3079 | error: | |
3080 | return ret; | |
3081 | } | |
3082 | ||
3083 | /* | |
3084 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3085 | */ | |
3086 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3087 | struct lttng_domain **domains) | |
3088 | { | |
b551a063 | 3089 | int ret, index = 0; |
54d01ffb DG |
3090 | ssize_t nb_dom = 0; |
3091 | ||
3092 | if (session->kernel_session != NULL) { | |
b551a063 | 3093 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3094 | nb_dom++; |
3095 | } | |
3096 | ||
b551a063 DG |
3097 | if (session->ust_session != NULL) { |
3098 | DBG3("Listing domains found UST global domain"); | |
3099 | nb_dom++; | |
3100 | } | |
54d01ffb | 3101 | |
b551a063 | 3102 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3103 | if (*domains == NULL) { |
3104 | ret = -LTTCOMM_FATAL; | |
3105 | goto error; | |
3106 | } | |
3107 | ||
b551a063 DG |
3108 | if (session->kernel_session != NULL) { |
3109 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3110 | index++; | |
3111 | } | |
3112 | ||
3113 | if (session->ust_session != NULL) { | |
3114 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3115 | index++; | |
3116 | } | |
54d01ffb | 3117 | |
54d01ffb DG |
3118 | return nb_dom; |
3119 | ||
3120 | error: | |
3121 | return ret; | |
3122 | } | |
3123 | ||
3124 | /* | |
3125 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3126 | */ | |
b551a063 | 3127 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3128 | struct lttng_channel **channels) |
3129 | { | |
3130 | int ret; | |
3131 | ssize_t nb_chan = 0; | |
3132 | ||
b551a063 DG |
3133 | switch (domain) { |
3134 | case LTTNG_DOMAIN_KERNEL: | |
3135 | if (session->kernel_session != NULL) { | |
3136 | nb_chan = session->kernel_session->channel_count; | |
3137 | } | |
0df502fd | 3138 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3139 | break; |
3140 | case LTTNG_DOMAIN_UST: | |
3141 | if (session->ust_session != NULL) { | |
bec39940 | 3142 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3143 | session->ust_session->domain_global.channels); |
3144 | } | |
0df502fd | 3145 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3146 | break; |
3147 | default: | |
3148 | *channels = NULL; | |
3149 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3150 | goto error; |
3151 | } | |
3152 | ||
b551a063 DG |
3153 | if (nb_chan > 0) { |
3154 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3155 | if (*channels == NULL) { | |
3156 | ret = -LTTCOMM_FATAL; | |
3157 | goto error; | |
3158 | } | |
54d01ffb | 3159 | |
b551a063 DG |
3160 | list_lttng_channels(domain, session, *channels); |
3161 | } else { | |
3162 | *channels = NULL; | |
3163 | } | |
2bdd86d4 | 3164 | |
54d01ffb DG |
3165 | return nb_chan; |
3166 | ||
3167 | error: | |
3168 | return ret; | |
3169 | } | |
3170 | ||
3171 | /* | |
3172 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3173 | */ | |
b551a063 | 3174 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3175 | char *channel_name, struct lttng_event **events) |
3176 | { | |
b551a063 | 3177 | int ret = 0; |
54d01ffb | 3178 | ssize_t nb_event = 0; |
54d01ffb | 3179 | |
b551a063 DG |
3180 | switch (domain) { |
3181 | case LTTNG_DOMAIN_KERNEL: | |
3182 | if (session->kernel_session != NULL) { | |
3183 | nb_event = list_lttng_kernel_events(channel_name, | |
3184 | session->kernel_session, events); | |
54d01ffb | 3185 | } |
b551a063 DG |
3186 | break; |
3187 | case LTTNG_DOMAIN_UST: | |
3188 | { | |
3189 | if (session->ust_session != NULL) { | |
3190 | nb_event = list_lttng_ust_global_events(channel_name, | |
3191 | &session->ust_session->domain_global, events); | |
3192 | } | |
3193 | break; | |
54d01ffb | 3194 | } |
b551a063 DG |
3195 | default: |
3196 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3197 | goto error; |
3198 | } | |
3199 | ||
b551a063 | 3200 | ret = nb_event; |
54d01ffb DG |
3201 | |
3202 | error: | |
3203 | return ret; | |
3204 | } | |
3205 | ||
3206 | /* | |
3207 | * Process the command requested by the lttng client within the command | |
3208 | * context structure. This function make sure that the return structure (llm) | |
3209 | * is set and ready for transmission before returning. | |
3210 | * | |
3211 | * Return any error encountered or 0 for success. | |
3212 | */ | |
3213 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3214 | { | |
3215 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3216 | int need_tracing_session = 1; |
54d01ffb DG |
3217 | |
3218 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3219 | ||
4fba7219 DG |
3220 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3221 | ret = LTTCOMM_KERN_NA; | |
3222 | goto error; | |
3223 | } | |
3224 | ||
54d01ffb DG |
3225 | /* |
3226 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3227 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3228 | * command. |
3229 | */ | |
3230 | switch(cmd_ctx->lsm->cmd_type) { | |
3231 | case LTTNG_LIST_SESSIONS: | |
3232 | case LTTNG_LIST_TRACEPOINTS: | |
3233 | case LTTNG_LIST_DOMAINS: | |
3234 | case LTTNG_LIST_CHANNELS: | |
3235 | case LTTNG_LIST_EVENTS: | |
3236 | break; | |
3237 | default: | |
3238 | /* Setup lttng message with no payload */ | |
3239 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3240 | if (ret < 0) { | |
3241 | /* This label does not try to unlock the session */ | |
3242 | goto init_setup_error; | |
3243 | } | |
3244 | } | |
3245 | ||
3246 | /* Commands that DO NOT need a session. */ | |
3247 | switch (cmd_ctx->lsm->cmd_type) { | |
3248 | case LTTNG_CALIBRATE: | |
3249 | case LTTNG_CREATE_SESSION: | |
3250 | case LTTNG_LIST_SESSIONS: | |
3251 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3252 | need_tracing_session = 0; |
54d01ffb DG |
3253 | break; |
3254 | default: | |
3255 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3256 | session_lock_list(); |
54d01ffb | 3257 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3258 | session_unlock_list(); |
54d01ffb DG |
3259 | if (cmd_ctx->session == NULL) { |
3260 | if (cmd_ctx->lsm->session.name != NULL) { | |
3261 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3262 | } else { | |
3263 | /* If no session name specified */ | |
3264 | ret = LTTCOMM_SELECT_SESS; | |
3265 | } | |
3266 | goto error; | |
3267 | } else { | |
3268 | /* Acquire lock for the session */ | |
3269 | session_lock(cmd_ctx->session); | |
3270 | } | |
3271 | break; | |
3272 | } | |
b389abbe | 3273 | |
54d01ffb DG |
3274 | /* |
3275 | * Check domain type for specific "pre-action". | |
3276 | */ | |
3277 | switch (cmd_ctx->lsm->domain.type) { | |
3278 | case LTTNG_DOMAIN_KERNEL: | |
3279 | /* Kernel tracer check */ | |
3280 | if (kernel_tracer_fd == 0) { | |
3281 | /* Basically, load kernel tracer modules */ | |
3282 | init_kernel_tracer(); | |
3283 | if (kernel_tracer_fd == 0) { | |
3284 | ret = LTTCOMM_KERN_NA; | |
3285 | goto error; | |
3286 | } | |
3287 | } | |
5eb91c98 | 3288 | |
54d01ffb | 3289 | /* Need a session for kernel command */ |
44d3bd01 | 3290 | if (need_tracing_session) { |
54d01ffb | 3291 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3292 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3293 | if (ret < 0) { |
54d01ffb | 3294 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3295 | goto error; |
3296 | } | |
b389abbe | 3297 | } |
7d29a247 | 3298 | |
54d01ffb | 3299 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3300 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3301 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3302 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3303 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3304 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3305 | if (ret < 0) { |
54d01ffb DG |
3306 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3307 | goto error; | |
950131af | 3308 | } |
3ff2ecac MD |
3309 | } else { |
3310 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3311 | } |
0d0c377a | 3312 | } |
54d01ffb | 3313 | break; |
2bdd86d4 | 3314 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3315 | { |
44d3bd01 | 3316 | if (need_tracing_session) { |
f6a9efaa | 3317 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3318 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3319 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3320 | if (ret != LTTCOMM_OK) { |
3321 | goto error; | |
3322 | } | |
3323 | } | |
7753dea8 MD |
3324 | /* Start the UST consumer daemons */ |
3325 | /* 64-bit */ | |
3326 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3327 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3328 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3329 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3330 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3331 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3332 | if (ret < 0) { |
7753dea8 MD |
3333 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3334 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3335 | goto error; |
3336 | } | |
48842b30 | 3337 | |
7753dea8 | 3338 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3339 | } else { |
7753dea8 MD |
3340 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3341 | } | |
3342 | /* 32-bit */ | |
fc7a59ce | 3343 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3344 | ustconsumer32_data.pid == 0 && |
3345 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3346 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3347 | ret = start_consumerd(&ustconsumer32_data); | |
3348 | if (ret < 0) { | |
3349 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3350 | ust_consumerd32_fd = -EINVAL; | |
3351 | goto error; | |
3352 | } | |
3353 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3354 | } else { | |
3355 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3356 | } |
44d3bd01 DG |
3357 | } |
3358 | break; | |
48842b30 | 3359 | } |
54d01ffb | 3360 | default: |
54d01ffb DG |
3361 | break; |
3362 | } | |
33a2b854 | 3363 | |
8e0af1b4 MD |
3364 | /* |
3365 | * Check that the UID or GID match that of the tracing session. | |
3366 | * The root user can interact with all sessions. | |
3367 | */ | |
3368 | if (need_tracing_session) { | |
3369 | if (!session_access_ok(cmd_ctx->session, | |
3370 | cmd_ctx->creds.uid, cmd_ctx->creds.gid)) { | |
3371 | ret = LTTCOMM_EPERM; | |
3372 | goto error; | |
3373 | } | |
3374 | } | |
3375 | ||
54d01ffb DG |
3376 | /* Process by command type */ |
3377 | switch (cmd_ctx->lsm->cmd_type) { | |
3378 | case LTTNG_ADD_CONTEXT: | |
3379 | { | |
3380 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3381 | cmd_ctx->lsm->u.context.channel_name, | |
3382 | cmd_ctx->lsm->u.context.event_name, | |
3383 | &cmd_ctx->lsm->u.context.ctx); | |
3384 | break; | |
3385 | } | |
3386 | case LTTNG_DISABLE_CHANNEL: | |
3387 | { | |
3388 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3389 | cmd_ctx->lsm->u.disable.channel_name); | |
3390 | break; | |
3391 | } | |
3392 | case LTTNG_DISABLE_EVENT: | |
3393 | { | |
3394 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3395 | cmd_ctx->lsm->u.disable.channel_name, | |
3396 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3397 | ret = LTTCOMM_OK; |
3398 | break; | |
3399 | } | |
54d01ffb DG |
3400 | case LTTNG_DISABLE_ALL_EVENT: |
3401 | { | |
2bdd86d4 | 3402 | DBG("Disabling all events"); |
54d01ffb DG |
3403 | |
3404 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3405 | cmd_ctx->lsm->u.disable.channel_name); | |
3406 | break; | |
3407 | } | |
3408 | case LTTNG_ENABLE_CHANNEL: | |
3409 | { | |
aea829b3 | 3410 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3411 | &cmd_ctx->lsm->u.channel.chan); |
3412 | break; | |
3413 | } | |
3414 | case LTTNG_ENABLE_EVENT: | |
3415 | { | |
3416 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3417 | cmd_ctx->lsm->u.enable.channel_name, | |
3418 | &cmd_ctx->lsm->u.enable.event); | |
3419 | break; | |
3420 | } | |
3421 | case LTTNG_ENABLE_ALL_EVENT: | |
3422 | { | |
2bdd86d4 | 3423 | DBG("Enabling all events"); |
54d01ffb DG |
3424 | |
3425 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3426 | cmd_ctx->lsm->u.enable.channel_name, |
3427 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3428 | break; |
3429 | } | |
052da939 | 3430 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3431 | { |
9f19cc17 | 3432 | struct lttng_event *events; |
54d01ffb | 3433 | ssize_t nb_events; |
052da939 | 3434 | |
54d01ffb DG |
3435 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3436 | if (nb_events < 0) { | |
3437 | ret = -nb_events; | |
3438 | goto error; | |
2ef84c95 DG |
3439 | } |
3440 | ||
3441 | /* | |
3442 | * Setup lttng message with payload size set to the event list size in | |
3443 | * bytes and then copy list into the llm payload. | |
3444 | */ | |
052da939 | 3445 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3446 | if (ret < 0) { |
052da939 | 3447 | free(events); |
2ef84c95 DG |
3448 | goto setup_error; |
3449 | } | |
3450 | ||
3451 | /* Copy event list into message payload */ | |
9f19cc17 | 3452 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3453 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3454 | |
9f19cc17 | 3455 | free(events); |
2ef84c95 DG |
3456 | |
3457 | ret = LTTCOMM_OK; | |
3458 | break; | |
3459 | } | |
f3ed775e | 3460 | case LTTNG_START_TRACE: |
8c0faa1d | 3461 | { |
54d01ffb | 3462 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3463 | break; |
3464 | } | |
f3ed775e | 3465 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3466 | { |
54d01ffb | 3467 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3468 | break; |
3469 | } | |
5e16da05 MD |
3470 | case LTTNG_CREATE_SESSION: |
3471 | { | |
54d01ffb | 3472 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3473 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3474 | break; |
3475 | } | |
3476 | case LTTNG_DESTROY_SESSION: | |
3477 | { | |
54d01ffb DG |
3478 | ret = cmd_destroy_session(cmd_ctx->session, |
3479 | cmd_ctx->lsm->session.name); | |
5461b305 | 3480 | break; |
5e16da05 | 3481 | } |
9f19cc17 | 3482 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3483 | { |
54d01ffb DG |
3484 | ssize_t nb_dom; |
3485 | struct lttng_domain *domains; | |
5461b305 | 3486 | |
54d01ffb DG |
3487 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3488 | if (nb_dom < 0) { | |
3489 | ret = -nb_dom; | |
3490 | goto error; | |
ce3d728c | 3491 | } |
520ff687 | 3492 | |
54d01ffb | 3493 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3494 | if (ret < 0) { |
3495 | goto setup_error; | |
520ff687 | 3496 | } |
57167058 | 3497 | |
54d01ffb DG |
3498 | /* Copy event list into message payload */ |
3499 | memcpy(cmd_ctx->llm->payload, domains, | |
3500 | nb_dom * sizeof(struct lttng_domain)); | |
3501 | ||
3502 | free(domains); | |
5e16da05 | 3503 | |
5461b305 | 3504 | ret = LTTCOMM_OK; |
5e16da05 MD |
3505 | break; |
3506 | } | |
9f19cc17 | 3507 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3508 | { |
54d01ffb DG |
3509 | size_t nb_chan; |
3510 | struct lttng_channel *channels; | |
3511 | ||
b551a063 DG |
3512 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3513 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3514 | if (nb_chan < 0) { |
3515 | ret = -nb_chan; | |
3516 | goto error; | |
5461b305 | 3517 | } |
ca95a216 | 3518 | |
54d01ffb | 3519 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3520 | if (ret < 0) { |
3521 | goto setup_error; | |
3522 | } | |
9f19cc17 | 3523 | |
54d01ffb DG |
3524 | /* Copy event list into message payload */ |
3525 | memcpy(cmd_ctx->llm->payload, channels, | |
3526 | nb_chan * sizeof(struct lttng_channel)); | |
3527 | ||
3528 | free(channels); | |
9f19cc17 DG |
3529 | |
3530 | ret = LTTCOMM_OK; | |
5461b305 | 3531 | break; |
5e16da05 | 3532 | } |
9f19cc17 | 3533 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3534 | { |
b551a063 | 3535 | ssize_t nb_event; |
684d34d2 | 3536 | struct lttng_event *events = NULL; |
9f19cc17 | 3537 | |
b551a063 | 3538 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3539 | cmd_ctx->lsm->u.list.channel_name, &events); |
3540 | if (nb_event < 0) { | |
3541 | ret = -nb_event; | |
3542 | goto error; | |
5461b305 | 3543 | } |
ca95a216 | 3544 | |
54d01ffb | 3545 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3546 | if (ret < 0) { |
3547 | goto setup_error; | |
3548 | } | |
9f19cc17 | 3549 | |
54d01ffb DG |
3550 | /* Copy event list into message payload */ |
3551 | memcpy(cmd_ctx->llm->payload, events, | |
3552 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3553 | |
54d01ffb | 3554 | free(events); |
9f19cc17 DG |
3555 | |
3556 | ret = LTTCOMM_OK; | |
5461b305 | 3557 | break; |
5e16da05 MD |
3558 | } |
3559 | case LTTNG_LIST_SESSIONS: | |
3560 | { | |
8e0af1b4 | 3561 | unsigned int nr_sessions; |
5461b305 | 3562 | |
8e0af1b4 MD |
3563 | session_lock_list(); |
3564 | nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
3565 | if (nr_sessions == 0) { | |
f3ed775e | 3566 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3567 | session_unlock_list(); |
5461b305 | 3568 | goto error; |
57167058 | 3569 | } |
8e0af1b4 | 3570 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3571 | if (ret < 0) { |
54d01ffb | 3572 | session_unlock_list(); |
5461b305 | 3573 | goto setup_error; |
e065084a | 3574 | } |
5e16da05 | 3575 | |
6c9cc2ab | 3576 | /* Filled the session array */ |
8e0af1b4 MD |
3577 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
3578 | cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
6c9cc2ab | 3579 | |
54d01ffb | 3580 | session_unlock_list(); |
5e16da05 | 3581 | |
5461b305 | 3582 | ret = LTTCOMM_OK; |
5e16da05 MD |
3583 | break; |
3584 | } | |
d0254c7c MD |
3585 | case LTTNG_CALIBRATE: |
3586 | { | |
54d01ffb DG |
3587 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3588 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3589 | break; |
3590 | } | |
d9800920 DG |
3591 | case LTTNG_REGISTER_CONSUMER: |
3592 | { | |
54d01ffb DG |
3593 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3594 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3595 | break; |
3596 | } | |
5e16da05 | 3597 | default: |
5e16da05 | 3598 | ret = LTTCOMM_UND; |
5461b305 | 3599 | break; |
fac6795d DG |
3600 | } |
3601 | ||
5461b305 | 3602 | error: |
5461b305 DG |
3603 | if (cmd_ctx->llm == NULL) { |
3604 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3605 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3606 | goto setup_error; |
3607 | } | |
3608 | } | |
54d01ffb | 3609 | /* Set return code */ |
5461b305 | 3610 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3611 | setup_error: |
b5541356 | 3612 | if (cmd_ctx->session) { |
54d01ffb | 3613 | session_unlock(cmd_ctx->session); |
b5541356 | 3614 | } |
54d01ffb | 3615 | init_setup_error: |
8028d920 | 3616 | return ret; |
fac6795d DG |
3617 | } |
3618 | ||
1d4b027a | 3619 | /* |
d063d709 DG |
3620 | * This thread manage all clients request using the unix client socket for |
3621 | * communication. | |
1d4b027a DG |
3622 | */ |
3623 | static void *thread_manage_clients(void *data) | |
3624 | { | |
5eb91c98 DG |
3625 | int sock = 0, ret, i, pollfd; |
3626 | uint32_t revents, nb_fd; | |
273ea72c | 3627 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3628 | struct lttng_poll_event events; |
1d4b027a DG |
3629 | |
3630 | DBG("[thread] Manage client started"); | |
3631 | ||
f6a9efaa DG |
3632 | rcu_register_thread(); |
3633 | ||
1d4b027a DG |
3634 | ret = lttcomm_listen_unix_sock(client_sock); |
3635 | if (ret < 0) { | |
3636 | goto error; | |
3637 | } | |
3638 | ||
5eb91c98 DG |
3639 | /* |
3640 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3641 | * more will be added to this poll set. | |
3642 | */ | |
3643 | ret = create_thread_poll_set(&events, 2); | |
3644 | if (ret < 0) { | |
3645 | goto error; | |
3646 | } | |
273ea72c | 3647 | |
5eb91c98 DG |
3648 | /* Add the application registration socket */ |
3649 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3650 | if (ret < 0) { | |
3651 | goto error; | |
3652 | } | |
273ea72c | 3653 | |
bbd973c2 DG |
3654 | /* |
3655 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3656 | */ |
3657 | if (opt_sig_parent) { | |
3658 | kill(ppid, SIGCHLD); | |
3659 | } | |
3660 | ||
3661 | while (1) { | |
1d4b027a | 3662 | DBG("Accepting client command ..."); |
273ea72c | 3663 | |
5eb91c98 DG |
3664 | nb_fd = LTTNG_POLL_GETNB(&events); |
3665 | ||
273ea72c | 3666 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3667 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3668 | if (ret < 0) { |
273ea72c DG |
3669 | goto error; |
3670 | } | |
3671 | ||
5eb91c98 DG |
3672 | for (i = 0; i < nb_fd; i++) { |
3673 | /* Fetch once the poll data */ | |
3674 | revents = LTTNG_POLL_GETEV(&events, i); | |
3675 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3676 | ||
3677 | /* Thread quit pipe has been closed. Killing thread. */ | |
3678 | ret = check_thread_quit_pipe(pollfd, revents); | |
3679 | if (ret) { | |
3680 | goto error; | |
3681 | } | |
3682 | ||
3683 | /* Event on the registration socket */ | |
3684 | if (pollfd == client_sock) { | |
3685 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3686 | ERR("Client socket poll error"); | |
3687 | goto error; | |
3688 | } | |
3689 | } | |
3690 | } | |
3691 | ||
3692 | DBG("Wait for client response"); | |
3693 | ||
3694 | sock = lttcomm_accept_unix_sock(client_sock); | |
3695 | if (sock < 0) { | |
273ea72c | 3696 | goto error; |
273ea72c DG |
3697 | } |
3698 | ||
be040666 DG |
3699 | /* Set socket option for credentials retrieval */ |
3700 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3701 | if (ret < 0) { | |
3702 | goto error; | |
3703 | } | |
3704 | ||
5eb91c98 | 3705 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3706 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3707 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3708 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3709 | goto error; |
5eb91c98 | 3710 | } |
1d4b027a | 3711 | |
5eb91c98 | 3712 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3713 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3714 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3715 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3716 | goto error; |
3717 | } | |
1d4b027a | 3718 | |
5eb91c98 DG |
3719 | cmd_ctx->llm = NULL; |
3720 | cmd_ctx->session = NULL; | |
1d4b027a | 3721 | |
5eb91c98 DG |
3722 | /* |
3723 | * Data is received from the lttng client. The struct | |
3724 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3725 | * the client. | |
3726 | */ | |
3727 | DBG("Receiving data from client ..."); | |
be040666 DG |
3728 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3729 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3730 | if (ret <= 0) { |
3731 | DBG("Nothing recv() from client... continuing"); | |
3732 | close(sock); | |
3733 | free(cmd_ctx); | |
3734 | continue; | |
3735 | } | |
1d4b027a | 3736 | |
5eb91c98 DG |
3737 | // TODO: Validate cmd_ctx including sanity check for |
3738 | // security purpose. | |
f7776ea7 | 3739 | |
f6a9efaa | 3740 | rcu_thread_online(); |
5eb91c98 DG |
3741 | /* |
3742 | * This function dispatch the work to the kernel or userspace tracer | |
3743 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3744 | * informations for the client. The command context struct contains | |
3745 | * everything this function may needs. | |
3746 | */ | |
3747 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3748 | rcu_thread_offline(); |
5eb91c98 | 3749 | if (ret < 0) { |
bbd973c2 | 3750 | /* |
5eb91c98 | 3751 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3752 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3753 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3754 | */ |
bbd973c2 | 3755 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3756 | continue; |
3757 | } | |
d6e4fca4 | 3758 | |
54d01ffb DG |
3759 | DBG("Sending response (size: %d, retcode: %s)", |
3760 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3761 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3762 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3763 | if (ret < 0) { |
3764 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3765 | } |
1d4b027a | 3766 | |
5eb91c98 | 3767 | /* End of transmission */ |
273ea72c | 3768 | close(sock); |
be040666 DG |
3769 | |
3770 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3771 | } |
3772 | ||
5eb91c98 DG |
3773 | error: |
3774 | DBG("Client thread dying"); | |
273ea72c | 3775 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3776 | close(client_sock); |
3777 | close(sock); | |
273ea72c | 3778 | |
5eb91c98 | 3779 | lttng_poll_clean(&events); |
a2fb29a5 | 3780 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3781 | |
3782 | rcu_unregister_thread(); | |
1d4b027a DG |
3783 | return NULL; |
3784 | } | |
3785 | ||
3786 | ||
fac6795d DG |
3787 | /* |
3788 | * usage function on stderr | |
3789 | */ | |
3790 | static void usage(void) | |
3791 | { | |
b716ce68 | 3792 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3793 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3794 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3795 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3796 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3797 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3798 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3799 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3800 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3801 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3802 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3803 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3804 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3805 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3806 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3807 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3808 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3809 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3810 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3811 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3812 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3813 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3814 | } |
3815 | ||
3816 | /* | |
3817 | * daemon argument parsing | |
3818 | */ | |
3819 | static int parse_args(int argc, char **argv) | |
3820 | { | |
3821 | int c; | |
3822 | ||
3823 | static struct option long_options[] = { | |
3824 | { "client-sock", 1, 0, 'c' }, | |
3825 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3826 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3827 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3828 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3829 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3830 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3831 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3832 | { "consumerd32-path", 1, 0, 'u' }, | |
3833 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3834 | { "consumerd64-path", 1, 0, 't' }, | |
3835 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3836 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3837 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3838 | { "help", 0, 0, 'h' }, |
3839 | { "group", 1, 0, 'g' }, | |
3840 | { "version", 0, 0, 'V' }, | |
75462a81 | 3841 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3842 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3843 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3844 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3845 | { NULL, 0, 0, 0 } |
3846 | }; | |
3847 | ||
3848 | while (1) { | |
3849 | int option_index = 0; | |
4fba7219 | 3850 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3851 | long_options, &option_index); |
fac6795d DG |
3852 | if (c == -1) { |
3853 | break; | |
3854 | } | |
3855 | ||
3856 | switch (c) { | |
3857 | case 0: | |
3858 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3859 | if (optarg) { | |
3860 | fprintf(stderr, " with arg %s\n", optarg); | |
3861 | } | |
3862 | break; | |
b716ce68 | 3863 | case 'c': |
fac6795d DG |
3864 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3865 | break; | |
3866 | case 'a': | |
3867 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3868 | break; | |
3869 | case 'd': | |
3870 | opt_daemon = 1; | |
3871 | break; | |
3872 | case 'g': | |
fb09408a | 3873 | opt_tracing_group = optarg; |
fac6795d DG |
3874 | break; |
3875 | case 'h': | |
3876 | usage(); | |
3877 | exit(EXIT_FAILURE); | |
3878 | case 'V': | |
3879 | fprintf(stdout, "%s\n", VERSION); | |
3880 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3881 | case 'S': |
3882 | opt_sig_parent = 1; | |
3883 | break; | |
d6f42150 | 3884 | case 'E': |
3bd1e081 | 3885 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3886 | break; |
3887 | case 'C': | |
3bd1e081 MD |
3888 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3889 | break; | |
3890 | case 'F': | |
7753dea8 | 3891 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3892 | break; |
3893 | case 'D': | |
7753dea8 MD |
3894 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3895 | break; | |
3896 | case 'H': | |
3897 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3898 | break; | |
3899 | case 'G': | |
3900 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3901 | break; |
4fba7219 DG |
3902 | case 'N': |
3903 | opt_no_kernel = 1; | |
3904 | break; | |
75462a81 DG |
3905 | case 'q': |
3906 | opt_quiet = 1; | |
3907 | break; | |
3f9947db | 3908 | case 'v': |
53086306 DG |
3909 | /* Verbose level can increase using multiple -v */ |
3910 | opt_verbose += 1; | |
3f9947db | 3911 | break; |
31f73cc9 | 3912 | case 'Z': |
3bd1e081 | 3913 | opt_verbose_consumer += 1; |
31f73cc9 | 3914 | break; |
fb09408a | 3915 | case 'u': |
fc7a59ce | 3916 | consumerd32_bin= optarg; |
ebaeda94 MD |
3917 | break; |
3918 | case 'U': | |
3919 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3920 | break; |
3921 | case 't': | |
fc7a59ce | 3922 | consumerd64_bin = optarg; |
ebaeda94 MD |
3923 | break; |
3924 | case 'T': | |
3925 | consumerd64_libdir = optarg; | |
fb09408a | 3926 | break; |
fac6795d DG |
3927 | default: |
3928 | /* Unknown option or other error. | |
3929 | * Error is printed by getopt, just return */ | |
3930 | return -1; | |
3931 | } | |
3932 | } | |
3933 | ||
3934 | return 0; | |
3935 | } | |
3936 | ||
3937 | /* | |
d063d709 | 3938 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3939 | * apps_sock - The communication socket for all UST apps. |
3940 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3941 | */ |
cf3af59e | 3942 | static int init_daemon_socket(void) |
fac6795d DG |
3943 | { |
3944 | int ret = 0; | |
3945 | mode_t old_umask; | |
3946 | ||
3947 | old_umask = umask(0); | |
3948 | ||
3949 | /* Create client tool unix socket */ | |
d6f42150 DG |
3950 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3951 | if (client_sock < 0) { | |
3952 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3953 | ret = -1; |
3954 | goto end; | |
3955 | } | |
3956 | ||
3957 | /* File permission MUST be 660 */ | |
3958 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3959 | if (ret < 0) { | |
d6f42150 | 3960 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3961 | perror("chmod"); |
3962 | goto end; | |
3963 | } | |
3964 | ||
3965 | /* Create the application unix socket */ | |
d6f42150 DG |
3966 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3967 | if (apps_sock < 0) { | |
3968 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3969 | ret = -1; |
3970 | goto end; | |
3971 | } | |
3972 | ||
d6f42150 | 3973 | /* File permission MUST be 666 */ |
54d01ffb DG |
3974 | ret = chmod(apps_unix_sock_path, |
3975 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3976 | if (ret < 0) { |
d6f42150 | 3977 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3978 | perror("chmod"); |
3979 | goto end; | |
3980 | } | |
3981 | ||
3982 | end: | |
3983 | umask(old_umask); | |
3984 | return ret; | |
3985 | } | |
3986 | ||
3987 | /* | |
54d01ffb DG |
3988 | * Check if the global socket is available, and if a daemon is answering at the |
3989 | * other side. If yes, error is returned. | |
fac6795d | 3990 | */ |
cf3af59e | 3991 | static int check_existing_daemon(void) |
fac6795d | 3992 | { |
7d8234d9 | 3993 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3994 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3995 | return 0; |
099e26bd | 3996 | } |
54d01ffb | 3997 | |
7d8234d9 | 3998 | /* Is there anybody out there ? */ |
099e26bd | 3999 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4000 | return -EEXIST; |
099e26bd | 4001 | } else { |
7d8234d9 | 4002 | return 0; |
099e26bd | 4003 | } |
fac6795d DG |
4004 | } |
4005 | ||
fac6795d | 4006 | /* |
d063d709 | 4007 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4008 | * |
d063d709 DG |
4009 | * Race window between mkdir and chown is OK because we are going from more |
4010 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4011 | */ |
be040666 | 4012 | static int set_permissions(char *rundir) |
fac6795d DG |
4013 | { |
4014 | int ret; | |
996b65c8 | 4015 | gid_t gid; |
fac6795d | 4016 | |
996b65c8 MD |
4017 | gid = allowed_group(); |
4018 | if (gid < 0) { | |
be040666 DG |
4019 | WARN("No tracing group detected"); |
4020 | ret = 0; | |
fac6795d DG |
4021 | goto end; |
4022 | } | |
4023 | ||
d6f42150 | 4024 | /* Set lttng run dir */ |
be040666 | 4025 | ret = chown(rundir, 0, gid); |
d6f42150 | 4026 | if (ret < 0) { |
be040666 | 4027 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4028 | perror("chown"); |
4029 | } | |
4030 | ||
4031 | /* lttng client socket path */ | |
996b65c8 | 4032 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4033 | if (ret < 0) { |
d6f42150 DG |
4034 | ERR("Unable to set group on %s", client_unix_sock_path); |
4035 | perror("chown"); | |
4036 | } | |
4037 | ||
3bd1e081 MD |
4038 | /* kconsumer error socket path */ |
4039 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4040 | if (ret < 0) { |
3bd1e081 MD |
4041 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4042 | perror("chown"); | |
4043 | } | |
4044 | ||
7753dea8 MD |
4045 | /* 64-bit ustconsumer error socket path */ |
4046 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4047 | if (ret < 0) { | |
4048 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4049 | perror("chown"); | |
4050 | } | |
4051 | ||
4052 | /* 32-bit ustconsumer compat32 error socket path */ | |
4053 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4054 | if (ret < 0) { |
7753dea8 | 4055 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4056 | perror("chown"); |
4057 | } | |
4058 | ||
d6f42150 | 4059 | DBG("All permissions are set"); |
e07ae692 | 4060 | |
fac6795d DG |
4061 | end: |
4062 | return ret; | |
4063 | } | |
4064 | ||
7a485870 | 4065 | /* |
d063d709 | 4066 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4067 | */ |
4068 | static int create_kernel_poll_pipe(void) | |
4069 | { | |
4070 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4071 | } | |
4072 | ||
099e26bd DG |
4073 | /* |
4074 | * Create the application command pipe to wake thread_manage_apps. | |
4075 | */ | |
4076 | static int create_apps_cmd_pipe(void) | |
4077 | { | |
4078 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4079 | } | |
4080 | ||
d6f42150 | 4081 | /* |
d063d709 | 4082 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4083 | */ |
67e40797 | 4084 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4085 | { |
4086 | int ret; | |
4087 | ||
67e40797 DG |
4088 | DBG3("Creating LTTng run directory: %s", rundir); |
4089 | ||
4090 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4091 | if (ret < 0) { |
b1f11e69 | 4092 | if (errno != EEXIST) { |
67e40797 | 4093 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4094 | goto error; |
4095 | } else { | |
4096 | ret = 0; | |
4097 | } | |
d6f42150 DG |
4098 | } |
4099 | ||
4100 | error: | |
4101 | return ret; | |
4102 | } | |
4103 | ||
4104 | /* | |
d063d709 DG |
4105 | * Setup sockets and directory needed by the kconsumerd communication with the |
4106 | * session daemon. | |
d6f42150 | 4107 | */ |
67e40797 DG |
4108 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4109 | const char *rundir) | |
d6f42150 DG |
4110 | { |
4111 | int ret; | |
67e40797 | 4112 | char path[PATH_MAX]; |
d6f42150 | 4113 | |
67e40797 | 4114 | switch (consumer_data->type) { |
7753dea8 | 4115 | case LTTNG_CONSUMER_KERNEL: |
67e40797 | 4116 | snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4117 | break; |
4118 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 4119 | snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4120 | break; |
4121 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 4122 | snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4123 | break; |
4124 | default: | |
4125 | ERR("Consumer type unknown"); | |
4126 | ret = -EINVAL; | |
4127 | goto error; | |
d6f42150 DG |
4128 | } |
4129 | ||
67e40797 DG |
4130 | DBG2("Creating consumer directory: %s", path); |
4131 | ||
3bd1e081 | 4132 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4133 | if (ret < 0) { |
6beb2242 | 4134 | if (errno != EEXIST) { |
3bd1e081 | 4135 | ERR("Failed to create %s", path); |
6beb2242 DG |
4136 | goto error; |
4137 | } | |
4138 | ret = 0; | |
d6f42150 DG |
4139 | } |
4140 | ||
4141 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4142 | consumer_data->err_sock = |
4143 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4144 | if (consumer_data->err_sock < 0) { | |
4145 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4146 | ret = -1; |
4147 | goto error; | |
4148 | } | |
4149 | ||
4150 | /* File permission MUST be 660 */ | |
3bd1e081 | 4151 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4152 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4153 | if (ret < 0) { |
3bd1e081 | 4154 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4155 | PERROR("chmod"); |
d6f42150 DG |
4156 | goto error; |
4157 | } | |
4158 | ||
4159 | error: | |
4160 | return ret; | |
4161 | } | |
4162 | ||
fac6795d | 4163 | /* |
d063d709 | 4164 | * Signal handler for the daemon |
cf3af59e | 4165 | * |
54d01ffb DG |
4166 | * Simply stop all worker threads, leaving main() return gracefully after |
4167 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4168 | */ |
4169 | static void sighandler(int sig) | |
4170 | { | |
4171 | switch (sig) { | |
cf3af59e MD |
4172 | case SIGPIPE: |
4173 | DBG("SIGPIPE catched"); | |
4174 | return; | |
4175 | case SIGINT: | |
4176 | DBG("SIGINT catched"); | |
4177 | stop_threads(); | |
4178 | break; | |
4179 | case SIGTERM: | |
4180 | DBG("SIGTERM catched"); | |
4181 | stop_threads(); | |
4182 | break; | |
4183 | default: | |
4184 | break; | |
fac6795d | 4185 | } |
fac6795d DG |
4186 | } |
4187 | ||
4188 | /* | |
d063d709 | 4189 | * Setup signal handler for : |
1d4b027a | 4190 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4191 | */ |
1d4b027a | 4192 | static int set_signal_handler(void) |
fac6795d | 4193 | { |
1d4b027a DG |
4194 | int ret = 0; |
4195 | struct sigaction sa; | |
4196 | sigset_t sigset; | |
fac6795d | 4197 | |
1d4b027a DG |
4198 | if ((ret = sigemptyset(&sigset)) < 0) { |
4199 | perror("sigemptyset"); | |
4200 | return ret; | |
4201 | } | |
d6f42150 | 4202 | |
1d4b027a DG |
4203 | sa.sa_handler = sighandler; |
4204 | sa.sa_mask = sigset; | |
4205 | sa.sa_flags = 0; | |
4206 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4207 | perror("sigaction"); | |
4208 | return ret; | |
d6f42150 DG |
4209 | } |
4210 | ||
1d4b027a DG |
4211 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4212 | perror("sigaction"); | |
4213 | return ret; | |
d6f42150 | 4214 | } |
aaf26714 | 4215 | |
1d4b027a DG |
4216 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4217 | perror("sigaction"); | |
4218 | return ret; | |
8c0faa1d DG |
4219 | } |
4220 | ||
1d4b027a DG |
4221 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4222 | ||
4223 | return ret; | |
fac6795d DG |
4224 | } |
4225 | ||
f3ed775e | 4226 | /* |
d063d709 DG |
4227 | * Set open files limit to unlimited. This daemon can open a large number of |
4228 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4229 | */ |
4230 | static void set_ulimit(void) | |
4231 | { | |
4232 | int ret; | |
4233 | struct rlimit lim; | |
4234 | ||
a88df331 | 4235 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4236 | lim.rlim_cur = 65535; |
4237 | lim.rlim_max = 65535; | |
4238 | ||
4239 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4240 | if (ret < 0) { | |
4241 | perror("failed to set open files limit"); | |
4242 | } | |
4243 | } | |
4244 | ||
fac6795d DG |
4245 | /* |
4246 | * main | |
4247 | */ | |
4248 | int main(int argc, char **argv) | |
4249 | { | |
fac6795d DG |
4250 | int ret = 0; |
4251 | void *status; | |
b082db07 | 4252 | const char *home_path; |
fac6795d | 4253 | |
f6a9efaa DG |
4254 | rcu_register_thread(); |
4255 | ||
273ea72c | 4256 | /* Create thread quit pipe */ |
cf3af59e MD |
4257 | if ((ret = init_thread_quit_pipe()) < 0) { |
4258 | goto error; | |
273ea72c DG |
4259 | } |
4260 | ||
7753dea8 | 4261 | setup_consumerd_path(); |
fb09408a | 4262 | |
fac6795d DG |
4263 | /* Parse arguments */ |
4264 | progname = argv[0]; | |
4265 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4266 | goto error; |
fac6795d DG |
4267 | } |
4268 | ||
4269 | /* Daemonize */ | |
4270 | if (opt_daemon) { | |
53094c05 DG |
4271 | ret = daemon(0, 0); |
4272 | if (ret < 0) { | |
4273 | perror("daemon"); | |
cf3af59e | 4274 | goto error; |
53094c05 | 4275 | } |
fac6795d DG |
4276 | } |
4277 | ||
4278 | /* Check if daemon is UID = 0 */ | |
4279 | is_root = !getuid(); | |
4280 | ||
fac6795d | 4281 | if (is_root) { |
67e40797 DG |
4282 | rundir = strdup(LTTNG_RUNDIR); |
4283 | ||
4284 | /* Create global run dir with root access */ | |
4285 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4286 | if (ret < 0) { |
cf3af59e | 4287 | goto error; |
d6f42150 DG |
4288 | } |
4289 | ||
fac6795d | 4290 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4291 | snprintf(apps_unix_sock_path, PATH_MAX, |
4292 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4293 | } |
4294 | ||
4295 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4296 | snprintf(client_unix_sock_path, PATH_MAX, |
4297 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4298 | } | |
0fdd1e2c DG |
4299 | |
4300 | /* Set global SHM for ust */ | |
4301 | if (strlen(wait_shm_path) == 0) { | |
4302 | snprintf(wait_shm_path, PATH_MAX, | |
4303 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4304 | } | |
67e40797 DG |
4305 | |
4306 | /* Setup kernel consumerd path */ | |
4307 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
4308 | KCONSUMERD_ERR_SOCK_PATH, rundir); | |
4309 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
4310 | KCONSUMERD_CMD_SOCK_PATH, rundir); | |
4311 | ||
4312 | DBG2("Kernel consumer err path: %s", | |
4313 | kconsumer_data.err_unix_sock_path); | |
4314 | DBG2("Kernel consumer cmd path: %s", | |
4315 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4316 | } else { |
b082db07 DG |
4317 | home_path = get_home_dir(); |
4318 | if (home_path == NULL) { | |
273ea72c DG |
4319 | /* TODO: Add --socket PATH option */ |
4320 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4321 | ret = -EPERM; |
4322 | goto error; | |
b082db07 DG |
4323 | } |
4324 | ||
67e40797 DG |
4325 | /* |
4326 | * Create rundir from home path. This will create something like | |
4327 | * $HOME/.lttng | |
4328 | */ | |
4329 | ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); | |
4330 | if (ret < 0) { | |
4331 | ret = -ENOMEM; | |
4332 | goto error; | |
4333 | } | |
4334 | ||
4335 | ret = create_lttng_rundir(rundir); | |
4336 | if (ret < 0) { | |
4337 | goto error; | |
4338 | } | |
4339 | ||
fac6795d | 4340 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4341 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4342 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4343 | } |
4344 | ||
4345 | /* Set the cli tool unix socket path */ | |
4346 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4347 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4348 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4349 | } |
0fdd1e2c DG |
4350 | |
4351 | /* Set global SHM for ust */ | |
4352 | if (strlen(wait_shm_path) == 0) { | |
4353 | snprintf(wait_shm_path, PATH_MAX, | |
4354 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4355 | } | |
fac6795d DG |
4356 | } |
4357 | ||
847177cd DG |
4358 | DBG("Client socket path %s", client_unix_sock_path); |
4359 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4360 | DBG("LTTng run directory path: %s", rundir); |
4361 | ||
4362 | /* 32 bits consumerd path setup */ | |
4363 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
4364 | USTCONSUMERD32_ERR_SOCK_PATH, rundir); | |
4365 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
4366 | USTCONSUMERD32_CMD_SOCK_PATH, rundir); | |
4367 | ||
4368 | DBG2("UST consumer 32 bits err path: %s", | |
4369 | ustconsumer32_data.err_unix_sock_path); | |
4370 | DBG2("UST consumer 32 bits cmd path: %s", | |
4371 | ustconsumer32_data.cmd_unix_sock_path); | |
4372 | ||
4373 | /* 64 bits consumerd path setup */ | |
4374 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
4375 | USTCONSUMERD64_ERR_SOCK_PATH, rundir); | |
4376 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
4377 | USTCONSUMERD64_CMD_SOCK_PATH, rundir); | |
4378 | ||
4379 | DBG2("UST consumer 64 bits err path: %s", | |
4380 | ustconsumer64_data.err_unix_sock_path); | |
4381 | DBG2("UST consumer 64 bits cmd path: %s", | |
4382 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4383 | |
273ea72c | 4384 | /* |
7d8234d9 | 4385 | * See if daemon already exist. |
fac6795d | 4386 | */ |
7d8234d9 | 4387 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4388 | ERR("Already running daemon.\n"); |
273ea72c | 4389 | /* |
cf3af59e MD |
4390 | * We do not goto exit because we must not cleanup() |
4391 | * because a daemon is already running. | |
ab118b20 | 4392 | */ |
cf3af59e | 4393 | goto error; |
a88df331 DG |
4394 | } |
4395 | ||
54d01ffb | 4396 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4397 | |
4398 | /* | |
4399 | * These actions must be executed as root. We do that *after* setting up | |
4400 | * the sockets path because we MUST make the check for another daemon using | |
4401 | * those paths *before* trying to set the kernel consumer sockets and init | |
4402 | * kernel tracer. | |
4403 | */ | |
4404 | if (is_root) { | |
67e40797 | 4405 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4406 | if (ret < 0) { |
4407 | goto exit; | |
4408 | } | |
4409 | ||
a88df331 | 4410 | /* Setup kernel tracer */ |
4fba7219 DG |
4411 | if (!opt_no_kernel) { |
4412 | init_kernel_tracer(); | |
4413 | } | |
a88df331 DG |
4414 | |
4415 | /* Set ulimit for open files */ | |
4416 | set_ulimit(); | |
fac6795d DG |
4417 | } |
4418 | ||
67e40797 DG |
4419 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4420 | if (ret < 0) { | |
4421 | goto exit; | |
4422 | } | |
4423 | ||
4424 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4425 | if (ret < 0) { | |
4426 | goto exit; | |
4427 | } | |
4428 | ||
cf3af59e MD |
4429 | if ((ret = set_signal_handler()) < 0) { |
4430 | goto exit; | |
fac6795d DG |
4431 | } |
4432 | ||
d6f42150 | 4433 | /* Setup the needed unix socket */ |
cf3af59e MD |
4434 | if ((ret = init_daemon_socket()) < 0) { |
4435 | goto exit; | |
fac6795d DG |
4436 | } |
4437 | ||
4438 | /* Set credentials to socket */ | |
be040666 | 4439 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4440 | goto exit; |
fac6795d DG |
4441 | } |
4442 | ||
5b8719f5 DG |
4443 | /* Get parent pid if -S, --sig-parent is specified. */ |
4444 | if (opt_sig_parent) { | |
4445 | ppid = getppid(); | |
4446 | } | |
4447 | ||
7a485870 | 4448 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4449 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4450 | goto exit; | |
7a485870 DG |
4451 | } |
4452 | ||
099e26bd DG |
4453 | /* Setup the thread apps communication pipe. */ |
4454 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4455 | goto exit; | |
4456 | } | |
4457 | ||
4458 | /* Init UST command queue. */ | |
4459 | cds_wfq_init(&ust_cmd_queue.queue); | |
4460 | ||
f6a9efaa DG |
4461 | /* Init UST app hash table */ |
4462 | ust_app_ht_alloc(); | |
4463 | ||
273ea72c | 4464 | /* |
54d01ffb DG |
4465 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4466 | * statically declared in session.c | |
273ea72c | 4467 | */ |
54d01ffb | 4468 | session_list_ptr = session_get_list(); |
b5541356 | 4469 | |
5eb91c98 DG |
4470 | /* Set up max poll set size */ |
4471 | lttng_poll_set_max_size(); | |
4472 | ||
cf3af59e | 4473 | /* Create thread to manage the client socket */ |
099e26bd DG |
4474 | ret = pthread_create(&client_thread, NULL, |
4475 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4476 | if (ret != 0) { |
099e26bd | 4477 | perror("pthread_create clients"); |
cf3af59e MD |
4478 | goto exit_client; |
4479 | } | |
fac6795d | 4480 | |
099e26bd DG |
4481 | /* Create thread to dispatch registration */ |
4482 | ret = pthread_create(&dispatch_thread, NULL, | |
4483 | thread_dispatch_ust_registration, (void *) NULL); | |
4484 | if (ret != 0) { | |
4485 | perror("pthread_create dispatch"); | |
4486 | goto exit_dispatch; | |
4487 | } | |
4488 | ||
4489 | /* Create thread to manage application registration. */ | |
4490 | ret = pthread_create(®_apps_thread, NULL, | |
4491 | thread_registration_apps, (void *) NULL); | |
4492 | if (ret != 0) { | |
4493 | perror("pthread_create registration"); | |
4494 | goto exit_reg_apps; | |
4495 | } | |
4496 | ||
cf3af59e | 4497 | /* Create thread to manage application socket */ |
54d01ffb DG |
4498 | ret = pthread_create(&apps_thread, NULL, |
4499 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4500 | if (ret != 0) { |
099e26bd | 4501 | perror("pthread_create apps"); |
cf3af59e MD |
4502 | goto exit_apps; |
4503 | } | |
fac6795d | 4504 | |
cf3af59e | 4505 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4506 | ret = pthread_create(&kernel_thread, NULL, |
4507 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4508 | if (ret != 0) { |
099e26bd | 4509 | perror("pthread_create kernel"); |
cf3af59e MD |
4510 | goto exit_kernel; |
4511 | } | |
7a485870 | 4512 | |
cf3af59e MD |
4513 | ret = pthread_join(kernel_thread, &status); |
4514 | if (ret != 0) { | |
4515 | perror("pthread_join"); | |
4516 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4517 | } |
4518 | ||
cf3af59e MD |
4519 | exit_kernel: |
4520 | ret = pthread_join(apps_thread, &status); | |
4521 | if (ret != 0) { | |
4522 | perror("pthread_join"); | |
4523 | goto error; /* join error, exit without cleanup */ | |
4524 | } | |
fac6795d | 4525 | |
cf3af59e | 4526 | exit_apps: |
099e26bd DG |
4527 | ret = pthread_join(reg_apps_thread, &status); |
4528 | if (ret != 0) { | |
4529 | perror("pthread_join"); | |
4530 | goto error; /* join error, exit without cleanup */ | |
4531 | } | |
4532 | ||
4533 | exit_reg_apps: | |
4534 | ret = pthread_join(dispatch_thread, &status); | |
4535 | if (ret != 0) { | |
4536 | perror("pthread_join"); | |
4537 | goto error; /* join error, exit without cleanup */ | |
4538 | } | |
4539 | ||
4540 | exit_dispatch: | |
cf3af59e MD |
4541 | ret = pthread_join(client_thread, &status); |
4542 | if (ret != 0) { | |
4543 | perror("pthread_join"); | |
4544 | goto error; /* join error, exit without cleanup */ | |
4545 | } | |
4546 | ||
3bd1e081 | 4547 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4548 | if (ret != 0) { |
3bd1e081 | 4549 | perror("join_consumer"); |
cf3af59e MD |
4550 | goto error; /* join error, exit without cleanup */ |
4551 | } | |
a88df331 | 4552 | |
cf3af59e | 4553 | exit_client: |
a88df331 | 4554 | exit: |
cf3af59e MD |
4555 | /* |
4556 | * cleanup() is called when no other thread is running. | |
4557 | */ | |
f6a9efaa | 4558 | rcu_thread_online(); |
cf3af59e | 4559 | cleanup(); |
f6a9efaa DG |
4560 | rcu_thread_offline(); |
4561 | rcu_unregister_thread(); | |
67e40797 | 4562 | if (!ret) { |
cf3af59e | 4563 | exit(EXIT_SUCCESS); |
67e40797 | 4564 | } |
cf3af59e | 4565 | error: |
5e16da05 | 4566 | exit(EXIT_FAILURE); |
fac6795d | 4567 | } |