Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 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> |
60b6c79c | 47 | #include <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 | ||
fc7a59ce AM |
177 | static const char *consumerd32_bin = |
178 | __stringify(CONFIG_CONSUMERD32_BIN); | |
179 | static const char *consumerd64_bin = | |
180 | __stringify(CONFIG_CONSUMERD64_BIN); | |
ebaeda94 MD |
181 | static const char *consumerd32_libdir = |
182 | __stringify(CONFIG_CONSUMERD32_LIBDIR); | |
183 | static const char *consumerd64_libdir = | |
184 | __stringify(CONFIG_CONSUMERD64_LIBDIR); | |
fb09408a MD |
185 | |
186 | static | |
7753dea8 | 187 | void setup_consumerd_path(void) |
fb09408a | 188 | { |
fc7a59ce | 189 | const char *bin, *libdir; |
fb09408a | 190 | |
7753dea8 MD |
191 | /* |
192 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
193 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
194 | * has not been defined. | |
7753dea8 | 195 | */ |
ebaeda94 | 196 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
197 | if (!consumerd32_bin[0]) { |
198 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
199 | } |
200 | if (!consumerd32_libdir[0]) { | |
201 | consumerd32_libdir = INSTALL_LIB_PATH; | |
202 | } | |
203 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
204 | if (!consumerd64_bin[0]) { |
205 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 206 | } |
ebaeda94 MD |
207 | if (!consumerd64_libdir[0]) { |
208 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
209 | } |
210 | #else | |
211 | #error "Unknown bitness" | |
212 | #endif | |
213 | ||
fb09408a MD |
214 | /* |
215 | * runtime env. var. overrides the build default. | |
216 | */ | |
fc7a59ce AM |
217 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
218 | if (bin) { | |
219 | consumerd32_bin = bin; | |
7753dea8 | 220 | } |
fc7a59ce AM |
221 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
222 | if (bin) { | |
223 | consumerd64_bin = bin; | |
ebaeda94 MD |
224 | } |
225 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
226 | if (libdir) { | |
227 | consumerd32_libdir = libdir; | |
228 | } | |
229 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
230 | if (libdir) { | |
231 | consumerd64_libdir = libdir; | |
fb09408a MD |
232 | } |
233 | } | |
234 | ||
5eb91c98 DG |
235 | /* |
236 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
237 | */ | |
238 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
239 | unsigned int size) | |
240 | { | |
241 | int ret; | |
242 | ||
243 | if (events == NULL || size == 0) { | |
244 | ret = -1; | |
245 | goto error; | |
246 | } | |
247 | ||
248 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
249 | if (ret < 0) { | |
250 | goto error; | |
251 | } | |
252 | ||
253 | /* Add quit pipe */ | |
254 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
255 | if (ret < 0) { | |
256 | goto error; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | ||
261 | error: | |
262 | return ret; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Check if the thread quit pipe was triggered. | |
267 | * | |
268 | * Return 1 if it was triggered else 0; | |
269 | */ | |
270 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
271 | { | |
272 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
273 | return 1; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
0fdd1e2c DG |
279 | /* |
280 | * Remove modules in reverse load order. | |
281 | */ | |
282 | static int modprobe_remove_kernel_modules(void) | |
283 | { | |
284 | int ret = 0, i; | |
285 | char modprobe[256]; | |
286 | ||
287 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
288 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 289 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
290 | kernel_modules_list[i].name); |
291 | if (ret < 0) { | |
24b487b8 | 292 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
293 | goto error; |
294 | } | |
295 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
296 | ret = system(modprobe); | |
297 | if (ret == -1) { | |
24b487b8 | 298 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
299 | kernel_modules_list[i].name); |
300 | } else if (kernel_modules_list[i].required | |
301 | && WEXITSTATUS(ret) != 0) { | |
302 | ERR("Unable to remove module %s", | |
303 | kernel_modules_list[i].name); | |
304 | } else { | |
305 | DBG("Modprobe removal successful %s", | |
306 | kernel_modules_list[i].name); | |
307 | } | |
308 | } | |
309 | ||
310 | error: | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Return group ID of the tracing group or -1 if not found. | |
316 | */ | |
996b65c8 MD |
317 | static gid_t allowed_group(void) |
318 | { | |
319 | struct group *grp; | |
320 | ||
274e143b MD |
321 | if (opt_tracing_group) { |
322 | grp = getgrnam(opt_tracing_group); | |
323 | } else { | |
324 | grp = getgrnam(default_tracing_group); | |
325 | } | |
996b65c8 MD |
326 | if (!grp) { |
327 | return -1; | |
328 | } else { | |
329 | return grp->gr_gid; | |
330 | } | |
331 | } | |
332 | ||
273ea72c | 333 | /* |
5eb91c98 | 334 | * Init thread quit pipe. |
273ea72c DG |
335 | * |
336 | * Return -1 on error or 0 if all pipes are created. | |
337 | */ | |
338 | static int init_thread_quit_pipe(void) | |
339 | { | |
340 | int ret; | |
341 | ||
342 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
343 | if (ret < 0) { | |
344 | perror("thread quit pipe"); | |
345 | goto error; | |
346 | } | |
347 | ||
348 | error: | |
349 | return ret; | |
350 | } | |
351 | ||
fac6795d | 352 | /* |
d063d709 DG |
353 | * Complete teardown of a kernel session. This free all data structure related |
354 | * to a kernel session and update counter. | |
fac6795d | 355 | */ |
1d4b027a | 356 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 357 | { |
8f7a84dd DG |
358 | if (!session->kernel_session) { |
359 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 360 | return; |
8f7a84dd DG |
361 | } |
362 | ||
84ea9c99 | 363 | DBG("Tearing down kernel session"); |
d9800920 | 364 | |
84ea9c99 MD |
365 | /* |
366 | * If a custom kernel consumer was registered, close the socket before | |
367 | * tearing down the complete kernel session structure | |
368 | */ | |
369 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
370 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 371 | } |
84ea9c99 MD |
372 | |
373 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
374 | } |
375 | ||
f6a9efaa DG |
376 | /* |
377 | * Complete teardown of all UST sessions. This will free everything on his path | |
378 | * and destroy the core essence of all ust sessions :) | |
379 | */ | |
380 | static void teardown_ust_session(struct ltt_session *session) | |
381 | { | |
84cd17c6 MD |
382 | int ret; |
383 | ||
8f7a84dd DG |
384 | if (!session->ust_session) { |
385 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 386 | return; |
8f7a84dd DG |
387 | } |
388 | ||
84ea9c99 | 389 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 390 | |
84cd17c6 MD |
391 | ret = ust_app_destroy_trace_all(session->ust_session); |
392 | if (ret) { | |
393 | ERR("Error in ust_app_destroy_trace_all"); | |
394 | } | |
8f7a84dd | 395 | |
f6a9efaa DG |
396 | trace_ust_destroy_session(session->ust_session); |
397 | } | |
398 | ||
099e26bd DG |
399 | /* |
400 | * Stop all threads by closing the thread quit pipe. | |
401 | */ | |
cf3af59e MD |
402 | static void stop_threads(void) |
403 | { | |
5eb91c98 DG |
404 | int ret; |
405 | ||
cf3af59e MD |
406 | /* Stopping all threads */ |
407 | DBG("Terminating all threads"); | |
54d01ffb | 408 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
409 | if (ret < 0) { |
410 | ERR("write error on thread quit pipe"); | |
411 | } | |
412 | ||
099e26bd DG |
413 | /* Dispatch thread */ |
414 | dispatch_thread_exit = 1; | |
415 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
416 | } |
417 | ||
fac6795d | 418 | /* |
d063d709 | 419 | * Cleanup the daemon |
fac6795d | 420 | */ |
cf3af59e | 421 | static void cleanup(void) |
fac6795d | 422 | { |
1d4b027a DG |
423 | int ret; |
424 | char *cmd; | |
af9737e9 | 425 | struct ltt_session *sess, *stmp; |
fac6795d | 426 | |
1d4b027a | 427 | DBG("Cleaning up"); |
e07ae692 | 428 | |
67e40797 DG |
429 | DBG("Removing %s directory", rundir); |
430 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
431 | if (ret < 0) { | |
432 | ERR("asprintf failed. Something is really wrong!"); | |
433 | } | |
5461b305 | 434 | |
67e40797 DG |
435 | /* Remove lttng run directory */ |
436 | ret = system(cmd); | |
437 | if (ret < 0) { | |
438 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 439 | } |
67e40797 | 440 | free(cmd); |
5461b305 | 441 | |
1d4b027a | 442 | DBG("Cleaning up all session"); |
fac6795d | 443 | |
b5541356 | 444 | /* Destroy session list mutex */ |
273ea72c DG |
445 | if (session_list_ptr != NULL) { |
446 | pthread_mutex_destroy(&session_list_ptr->lock); | |
447 | ||
448 | /* Cleanup ALL session */ | |
54d01ffb DG |
449 | cds_list_for_each_entry_safe(sess, stmp, |
450 | &session_list_ptr->head, list) { | |
273ea72c | 451 | teardown_kernel_session(sess); |
f6a9efaa DG |
452 | teardown_ust_session(sess); |
453 | free(sess); | |
273ea72c DG |
454 | } |
455 | } | |
456 | ||
099e26bd | 457 | DBG("Closing all UST sockets"); |
56fff090 | 458 | ust_app_clean_list(); |
099e26bd | 459 | |
3bd1e081 | 460 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 461 | |
4fba7219 DG |
462 | if (is_root && !opt_no_kernel) { |
463 | DBG2("Closing kernel fd"); | |
464 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
465 | DBG("Unloading kernel modules"); |
466 | modprobe_remove_kernel_modules(); | |
467 | } | |
5eb91c98 DG |
468 | |
469 | close(thread_quit_pipe[0]); | |
470 | close(thread_quit_pipe[1]); | |
421cb601 DG |
471 | |
472 | /* <fun> */ | |
f56a39af | 473 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
474 | "Matthew, BEET driven development works!%c[%dm", |
475 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
476 | /* </fun> */ | |
fac6795d DG |
477 | } |
478 | ||
e065084a | 479 | /* |
d063d709 | 480 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 481 | * |
d063d709 | 482 | * Return lttcomm error code. |
e065084a DG |
483 | */ |
484 | static int send_unix_sock(int sock, void *buf, size_t len) | |
485 | { | |
486 | /* Check valid length */ | |
487 | if (len <= 0) { | |
488 | return -1; | |
489 | } | |
490 | ||
491 | return lttcomm_send_unix_sock(sock, buf, len); | |
492 | } | |
493 | ||
5461b305 | 494 | /* |
d063d709 | 495 | * Free memory of a command context structure. |
5461b305 | 496 | */ |
a2fb29a5 | 497 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 498 | { |
a2fb29a5 DG |
499 | DBG("Clean command context structure"); |
500 | if (*cmd_ctx) { | |
501 | if ((*cmd_ctx)->llm) { | |
502 | free((*cmd_ctx)->llm); | |
5461b305 | 503 | } |
a2fb29a5 DG |
504 | if ((*cmd_ctx)->lsm) { |
505 | free((*cmd_ctx)->lsm); | |
5461b305 | 506 | } |
a2fb29a5 DG |
507 | free(*cmd_ctx); |
508 | *cmd_ctx = NULL; | |
5461b305 DG |
509 | } |
510 | } | |
511 | ||
f3ed775e | 512 | /* |
d063d709 | 513 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 514 | */ |
2bdd86d4 | 515 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
516 | int sock, struct ltt_kernel_channel *channel, |
517 | uid_t uid, gid_t gid) | |
f3ed775e DG |
518 | { |
519 | int ret; | |
f3ed775e | 520 | struct ltt_kernel_stream *stream; |
3bd1e081 | 521 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 522 | |
3bd1e081 | 523 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 524 | channel->channel->name); |
f3ed775e | 525 | |
3bd1e081 MD |
526 | /* Send channel */ |
527 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
528 | lkm.u.channel.channel_key = channel->fd; | |
529 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
530 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 531 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 532 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 533 | if (ret < 0) { |
3bd1e081 | 534 | perror("send consumer channel"); |
f3ed775e DG |
535 | goto error; |
536 | } | |
537 | ||
3bd1e081 | 538 | /* Send streams */ |
7a485870 | 539 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
540 | if (!stream->fd) { |
541 | continue; | |
542 | } | |
543 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
544 | lkm.u.stream.channel_key = channel->fd; | |
545 | lkm.u.stream.stream_key = stream->fd; | |
546 | lkm.u.stream.state = stream->state; | |
547 | lkm.u.stream.output = channel->channel->attr.output; | |
548 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
549 | lkm.u.stream.uid = uid; |
550 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
551 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
552 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
553 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
554 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
555 | if (ret < 0) { | |
556 | perror("send consumer stream"); | |
557 | goto error; | |
558 | } | |
559 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
560 | if (ret < 0) { | |
561 | perror("send consumer stream ancillary data"); | |
562 | goto error; | |
f3ed775e DG |
563 | } |
564 | } | |
565 | ||
3bd1e081 | 566 | DBG("consumer channel streams sent"); |
f3ed775e DG |
567 | |
568 | return 0; | |
569 | ||
570 | error: | |
571 | return ret; | |
572 | } | |
573 | ||
574 | /* | |
d063d709 | 575 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 576 | */ |
2bdd86d4 | 577 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 578 | struct ltt_kernel_session *session) |
f3ed775e DG |
579 | { |
580 | int ret; | |
581 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
582 | struct lttcomm_consumer_msg lkm; |
583 | int sock = session->consumer_fd; | |
7a485870 DG |
584 | |
585 | DBG("Sending metadata stream fd"); | |
586 | ||
2bdd86d4 | 587 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 588 | if (session->consumer_fd == 0) { |
3bd1e081 | 589 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
590 | } |
591 | ||
7a485870 | 592 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
593 | /* Send metadata channel fd */ |
594 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
595 | lkm.u.channel.channel_key = session->metadata->fd; | |
596 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
597 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
598 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
599 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
600 | if (ret < 0) { | |
601 | perror("send consumer channel"); | |
602 | goto error; | |
603 | } | |
604 | ||
605 | /* Send metadata stream fd */ | |
606 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
607 | lkm.u.stream.channel_key = session->metadata->fd; | |
608 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
609 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
610 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
611 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
612 | lkm.u.stream.uid = session->uid; |
613 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
614 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
615 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
616 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
617 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
618 | if (ret < 0) { | |
619 | perror("send consumer stream"); | |
620 | goto error; | |
621 | } | |
622 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 623 | if (ret < 0) { |
3bd1e081 | 624 | perror("send consumer stream"); |
7a485870 DG |
625 | goto error; |
626 | } | |
627 | } | |
f3ed775e | 628 | |
f3ed775e | 629 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
630 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
631 | session->uid, session->gid); | |
2bdd86d4 MD |
632 | if (ret < 0) { |
633 | goto error; | |
634 | } | |
635 | } | |
636 | ||
637 | DBG("consumer fds (metadata and channel streams) sent"); | |
638 | ||
639 | return 0; | |
640 | ||
641 | error: | |
642 | return ret; | |
643 | } | |
644 | ||
fac6795d | 645 | /* |
0fdd1e2c | 646 | * Notify UST applications using the shm mmap futex. |
fac6795d | 647 | */ |
0fdd1e2c | 648 | static int notify_ust_apps(int active) |
fac6795d | 649 | { |
0fdd1e2c | 650 | char *wait_shm_mmap; |
fac6795d | 651 | |
0fdd1e2c | 652 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 653 | |
0fdd1e2c DG |
654 | /* See shm.c for this call implying mmap, shm and futex calls */ |
655 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
656 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
657 | goto error; |
658 | } | |
659 | ||
0fdd1e2c DG |
660 | /* Wake waiting process */ |
661 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
662 | ||
663 | /* Apps notified successfully */ | |
664 | return 0; | |
fac6795d DG |
665 | |
666 | error: | |
0fdd1e2c | 667 | return -1; |
fac6795d DG |
668 | } |
669 | ||
e065084a | 670 | /* |
d063d709 DG |
671 | * Setup the outgoing data buffer for the response (llm) by allocating the |
672 | * right amount of memory and copying the original information from the lsm | |
673 | * structure. | |
ca95a216 | 674 | * |
d063d709 | 675 | * Return total size of the buffer pointed by buf. |
ca95a216 | 676 | */ |
5461b305 | 677 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 678 | { |
f3ed775e | 679 | int ret, buf_size; |
ca95a216 | 680 | |
f3ed775e | 681 | buf_size = size; |
5461b305 | 682 | |
ba7f0ae5 | 683 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 684 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 685 | perror("zmalloc"); |
5461b305 | 686 | ret = -ENOMEM; |
ca95a216 DG |
687 | goto error; |
688 | } | |
689 | ||
5461b305 DG |
690 | /* Copy common data */ |
691 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 692 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 693 | |
5461b305 DG |
694 | cmd_ctx->llm->data_size = size; |
695 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
696 | ||
ca95a216 DG |
697 | return buf_size; |
698 | ||
699 | error: | |
700 | return ret; | |
701 | } | |
702 | ||
7a485870 | 703 | /* |
5eb91c98 | 704 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 705 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 706 | */ |
5eb91c98 | 707 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 708 | { |
5eb91c98 | 709 | int ret; |
7a485870 DG |
710 | struct ltt_session *session; |
711 | struct ltt_kernel_channel *channel; | |
712 | ||
5eb91c98 | 713 | DBG("Updating kernel poll set"); |
7a485870 | 714 | |
54d01ffb | 715 | session_lock_list(); |
b5541356 | 716 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 717 | session_lock(session); |
7a485870 | 718 | if (session->kernel_session == NULL) { |
54d01ffb | 719 | session_unlock(session); |
7a485870 DG |
720 | continue; |
721 | } | |
7a485870 | 722 | |
54d01ffb DG |
723 | cds_list_for_each_entry(channel, |
724 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
725 | /* Add channel fd to the kernel poll set */ |
726 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
727 | if (ret < 0) { | |
54d01ffb | 728 | session_unlock(session); |
5eb91c98 DG |
729 | goto error; |
730 | } | |
731 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 732 | } |
54d01ffb | 733 | session_unlock(session); |
7a485870 | 734 | } |
54d01ffb | 735 | session_unlock_list(); |
7a485870 | 736 | |
5eb91c98 | 737 | return 0; |
7a485870 DG |
738 | |
739 | error: | |
54d01ffb | 740 | session_unlock_list(); |
7a485870 DG |
741 | return -1; |
742 | } | |
743 | ||
744 | /* | |
54d01ffb | 745 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 746 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 747 | * |
d063d709 | 748 | * Useful for CPU hotplug feature. |
7a485870 | 749 | */ |
2bdd86d4 | 750 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
751 | { |
752 | int ret = 0; | |
753 | struct ltt_session *session; | |
754 | struct ltt_kernel_channel *channel; | |
755 | ||
756 | DBG("Updating kernel streams for channel fd %d", fd); | |
757 | ||
54d01ffb | 758 | session_lock_list(); |
b5541356 | 759 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 760 | session_lock(session); |
7a485870 | 761 | if (session->kernel_session == NULL) { |
54d01ffb | 762 | session_unlock(session); |
7a485870 DG |
763 | continue; |
764 | } | |
d9800920 DG |
765 | |
766 | /* This is not suppose to be 0 but this is an extra security check */ | |
767 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 768 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
769 | } |
770 | ||
5eb91c98 DG |
771 | cds_list_for_each_entry(channel, |
772 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
773 | if (channel->fd == fd) { |
774 | DBG("Channel found, updating kernel streams"); | |
775 | ret = kernel_open_channel_stream(channel); | |
776 | if (ret < 0) { | |
b3c750d2 | 777 | goto error; |
7a485870 | 778 | } |
d9800920 | 779 | |
7a485870 | 780 | /* |
5eb91c98 DG |
781 | * Have we already sent fds to the consumer? If yes, it means |
782 | * that tracing is started so it is safe to send our updated | |
783 | * stream fds. | |
7a485870 | 784 | */ |
3bd1e081 | 785 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 786 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
787 | session->kernel_session->consumer_fd, channel, |
788 | session->uid, session->gid); | |
7a485870 | 789 | if (ret < 0) { |
b3c750d2 | 790 | goto error; |
7a485870 DG |
791 | } |
792 | } | |
b3c750d2 | 793 | goto error; |
7a485870 DG |
794 | } |
795 | } | |
54d01ffb | 796 | session_unlock(session); |
7a485870 | 797 | } |
54d01ffb | 798 | session_unlock_list(); |
b3c750d2 | 799 | return ret; |
7a485870 | 800 | |
b3c750d2 | 801 | error: |
54d01ffb DG |
802 | session_unlock(session); |
803 | session_unlock_list(); | |
7a485870 DG |
804 | return ret; |
805 | } | |
806 | ||
487cf67c DG |
807 | /* |
808 | * For each tracing session, update newly registered apps. | |
809 | */ | |
810 | static void update_ust_app(int app_sock) | |
811 | { | |
812 | struct ltt_session *sess, *stmp; | |
813 | ||
814 | /* For all tracing session(s) */ | |
815 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
816 | if (sess->ust_session) { |
817 | ust_app_global_update(sess->ust_session, app_sock); | |
818 | } | |
487cf67c DG |
819 | } |
820 | } | |
821 | ||
7a485870 | 822 | /* |
d063d709 | 823 | * This thread manage event coming from the kernel. |
7a485870 | 824 | * |
d063d709 DG |
825 | * Features supported in this thread: |
826 | * -) CPU Hotplug | |
7a485870 DG |
827 | */ |
828 | static void *thread_manage_kernel(void *data) | |
829 | { | |
5eb91c98 DG |
830 | int ret, i, pollfd, update_poll_flag = 1; |
831 | uint32_t revents, nb_fd; | |
7a485870 | 832 | char tmp; |
5eb91c98 | 833 | struct lttng_poll_event events; |
7a485870 DG |
834 | |
835 | DBG("Thread manage kernel started"); | |
836 | ||
5eb91c98 DG |
837 | ret = create_thread_poll_set(&events, 2); |
838 | if (ret < 0) { | |
839 | goto error; | |
840 | } | |
841 | ||
842 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
843 | if (ret < 0) { | |
844 | goto error; | |
845 | } | |
846 | ||
7a485870 DG |
847 | while (1) { |
848 | if (update_poll_flag == 1) { | |
5f822d0a DG |
849 | /* |
850 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
851 | * quit pipe and the kernel pipe. | |
852 | */ | |
853 | events.nb_fd = 2; | |
854 | ||
5eb91c98 DG |
855 | ret = update_kernel_poll(&events); |
856 | if (ret < 0) { | |
7a485870 DG |
857 | goto error; |
858 | } | |
859 | update_poll_flag = 0; | |
860 | } | |
861 | ||
5eb91c98 DG |
862 | nb_fd = LTTNG_POLL_GETNB(&events); |
863 | ||
864 | DBG("Thread kernel polling on %d fds", nb_fd); | |
865 | ||
866 | /* Zeroed the poll events */ | |
867 | lttng_poll_reset(&events); | |
7a485870 DG |
868 | |
869 | /* Poll infinite value of time */ | |
5eb91c98 | 870 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 871 | if (ret < 0) { |
7a485870 DG |
872 | goto error; |
873 | } else if (ret == 0) { | |
874 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
875 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
876 | "This should not have happened! Continuing..."); | |
7a485870 DG |
877 | continue; |
878 | } | |
879 | ||
5eb91c98 DG |
880 | for (i = 0; i < nb_fd; i++) { |
881 | /* Fetch once the poll data */ | |
882 | revents = LTTNG_POLL_GETEV(&events, i); | |
883 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 884 | |
5eb91c98 DG |
885 | /* Thread quit pipe has been closed. Killing thread. */ |
886 | ret = check_thread_quit_pipe(pollfd, revents); | |
887 | if (ret) { | |
888 | goto error; | |
889 | } | |
7a485870 | 890 | |
5eb91c98 DG |
891 | /* Check for data on kernel pipe */ |
892 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
893 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
894 | update_poll_flag = 1; | |
895 | continue; | |
896 | } else { | |
897 | /* | |
898 | * New CPU detected by the kernel. Adding kernel stream to | |
899 | * kernel session and updating the kernel consumer | |
900 | */ | |
901 | if (revents & LPOLLIN) { | |
2bdd86d4 | 902 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
903 | if (ret < 0) { |
904 | continue; | |
905 | } | |
906 | break; | |
907 | /* | |
908 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
909 | * and unregister kernel stream at this point. | |
910 | */ | |
7a485870 | 911 | } |
7a485870 DG |
912 | } |
913 | } | |
914 | } | |
915 | ||
916 | error: | |
917 | DBG("Kernel thread dying"); | |
273ea72c DG |
918 | close(kernel_poll_pipe[0]); |
919 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
920 | |
921 | lttng_poll_clean(&events); | |
922 | ||
7a485870 DG |
923 | return NULL; |
924 | } | |
925 | ||
1d4b027a | 926 | /* |
3bd1e081 | 927 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 928 | */ |
3bd1e081 | 929 | static void *thread_manage_consumer(void *data) |
1d4b027a | 930 | { |
5eb91c98 DG |
931 | int sock = 0, i, ret, pollfd; |
932 | uint32_t revents, nb_fd; | |
1d4b027a | 933 | enum lttcomm_return_code code; |
5eb91c98 | 934 | struct lttng_poll_event events; |
3bd1e081 | 935 | struct consumer_data *consumer_data = data; |
1d4b027a | 936 | |
3bd1e081 | 937 | DBG("[thread] Manage consumer started"); |
1d4b027a | 938 | |
3bd1e081 | 939 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
940 | if (ret < 0) { |
941 | goto error; | |
942 | } | |
943 | ||
5eb91c98 DG |
944 | /* |
945 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
946 | * Nothing more will be added to this poll set. | |
947 | */ | |
948 | ret = create_thread_poll_set(&events, 2); | |
949 | if (ret < 0) { | |
950 | goto error; | |
951 | } | |
273ea72c | 952 | |
3bd1e081 | 953 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
954 | if (ret < 0) { |
955 | goto error; | |
956 | } | |
957 | ||
958 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
959 | |
960 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 961 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 962 | if (ret < 0) { |
273ea72c DG |
963 | goto error; |
964 | } | |
965 | ||
5eb91c98 DG |
966 | for (i = 0; i < nb_fd; i++) { |
967 | /* Fetch once the poll data */ | |
968 | revents = LTTNG_POLL_GETEV(&events, i); | |
969 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
970 | ||
971 | /* Thread quit pipe has been closed. Killing thread. */ | |
972 | ret = check_thread_quit_pipe(pollfd, revents); | |
973 | if (ret) { | |
974 | goto error; | |
975 | } | |
976 | ||
977 | /* Event on the registration socket */ | |
3bd1e081 | 978 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 979 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 980 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
981 | goto error; |
982 | } | |
983 | } | |
273ea72c DG |
984 | } |
985 | ||
3bd1e081 | 986 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
987 | if (sock < 0) { |
988 | goto error; | |
989 | } | |
990 | ||
3bd1e081 | 991 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 992 | |
712ea556 | 993 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
994 | ret = lttcomm_recv_unix_sock(sock, &code, |
995 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
996 | if (ret <= 0) { |
997 | goto error; | |
998 | } | |
999 | ||
3bd1e081 MD |
1000 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1001 | consumer_data->cmd_sock = | |
1002 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1003 | if (consumer_data->cmd_sock < 0) { | |
1004 | sem_post(&consumer_data->sem); | |
48842b30 | 1005 | PERROR("consumer connect"); |
1d4b027a DG |
1006 | goto error; |
1007 | } | |
1008 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1009 | sem_post(&consumer_data->sem); |
1010 | DBG("consumer command socket ready"); | |
1d4b027a | 1011 | } else { |
3bd1e081 | 1012 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1013 | lttcomm_get_readable_code(-code)); |
1014 | goto error; | |
1015 | } | |
1016 | ||
54d01ffb | 1017 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1018 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1019 | if (ret < 0) { |
72079cae DG |
1020 | goto error; |
1021 | } | |
1022 | ||
5eb91c98 DG |
1023 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1024 | if (ret < 0) { | |
72079cae | 1025 | goto error; |
5eb91c98 DG |
1026 | } |
1027 | ||
1028 | /* Update number of fd */ | |
1029 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1030 | ||
1031 | /* Inifinite blocking call, waiting for transmission */ | |
1032 | ret = lttng_poll_wait(&events, -1); | |
1033 | if (ret < 0) { | |
72079cae DG |
1034 | goto error; |
1035 | } | |
1036 | ||
5eb91c98 DG |
1037 | for (i = 0; i < nb_fd; i++) { |
1038 | /* Fetch once the poll data */ | |
1039 | revents = LTTNG_POLL_GETEV(&events, i); | |
1040 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1041 | ||
1042 | /* Thread quit pipe has been closed. Killing thread. */ | |
1043 | ret = check_thread_quit_pipe(pollfd, revents); | |
1044 | if (ret) { | |
1045 | goto error; | |
1046 | } | |
1047 | ||
1048 | /* Event on the kconsumerd socket */ | |
1049 | if (pollfd == sock) { | |
1050 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1051 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1052 | goto error; |
1053 | } | |
1054 | } | |
1055 | } | |
1056 | ||
712ea556 | 1057 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1058 | ret = lttcomm_recv_unix_sock(sock, &code, |
1059 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1060 | if (ret <= 0) { |
3bd1e081 | 1061 | ERR("consumer closed the command socket"); |
712ea556 | 1062 | goto error; |
6f61d021 | 1063 | } |
1d4b027a | 1064 | |
3bd1e081 | 1065 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1066 | |
1d4b027a | 1067 | error: |
3bd1e081 MD |
1068 | DBG("consumer thread dying"); |
1069 | close(consumer_data->err_sock); | |
1070 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1071 | close(sock); |
273ea72c | 1072 | |
3bd1e081 MD |
1073 | unlink(consumer_data->err_unix_sock_path); |
1074 | unlink(consumer_data->cmd_unix_sock_path); | |
1075 | consumer_data->pid = 0; | |
1d4b027a | 1076 | |
5eb91c98 | 1077 | lttng_poll_clean(&events); |
0177d773 | 1078 | |
5eb91c98 | 1079 | return NULL; |
099e26bd DG |
1080 | } |
1081 | ||
099e26bd DG |
1082 | /* |
1083 | * This thread manage application communication. | |
1d4b027a DG |
1084 | */ |
1085 | static void *thread_manage_apps(void *data) | |
099e26bd | 1086 | { |
5eb91c98 DG |
1087 | int i, ret, pollfd; |
1088 | uint32_t revents, nb_fd; | |
099e26bd | 1089 | struct ust_command ust_cmd; |
5eb91c98 | 1090 | struct lttng_poll_event events; |
099e26bd DG |
1091 | |
1092 | DBG("[thread] Manage application started"); | |
1093 | ||
f6a9efaa DG |
1094 | rcu_register_thread(); |
1095 | rcu_thread_online(); | |
1096 | ||
5eb91c98 DG |
1097 | ret = create_thread_poll_set(&events, 2); |
1098 | if (ret < 0) { | |
1099 | goto error; | |
1100 | } | |
099e26bd | 1101 | |
5eb91c98 DG |
1102 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1103 | if (ret < 0) { | |
1104 | goto error; | |
1105 | } | |
099e26bd | 1106 | |
5eb91c98 DG |
1107 | while (1) { |
1108 | /* Zeroed the events structure */ | |
1109 | lttng_poll_reset(&events); | |
0177d773 | 1110 | |
5eb91c98 | 1111 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1112 | |
1113 | DBG("Apps thread polling on %d fds", nb_fd); | |
1114 | ||
1115 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1116 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1117 | if (ret < 0) { |
099e26bd DG |
1118 | goto error; |
1119 | } | |
1120 | ||
5eb91c98 DG |
1121 | for (i = 0; i < nb_fd; i++) { |
1122 | /* Fetch once the poll data */ | |
1123 | revents = LTTNG_POLL_GETEV(&events, i); | |
1124 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1125 | ||
1126 | /* Thread quit pipe has been closed. Killing thread. */ | |
1127 | ret = check_thread_quit_pipe(pollfd, revents); | |
1128 | if (ret) { | |
099e26bd | 1129 | goto error; |
5eb91c98 | 1130 | } |
099e26bd | 1131 | |
5eb91c98 DG |
1132 | /* Inspect the apps cmd pipe */ |
1133 | if (pollfd == apps_cmd_pipe[0]) { | |
1134 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1135 | ERR("Apps command pipe error"); | |
0177d773 | 1136 | goto error; |
5eb91c98 DG |
1137 | } else if (revents & LPOLLIN) { |
1138 | /* Empty pipe */ | |
1139 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1140 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1141 | perror("read apps cmd pipe"); | |
1142 | goto error; | |
1143 | } | |
099e26bd | 1144 | |
5eb91c98 | 1145 | /* Register applicaton to the session daemon */ |
56fff090 | 1146 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1147 | ust_cmd.sock); |
88ff5b7f | 1148 | if (ret == -ENOMEM) { |
5eb91c98 | 1149 | goto error; |
88ff5b7f MD |
1150 | } else if (ret < 0) { |
1151 | break; | |
5eb91c98 DG |
1152 | } |
1153 | ||
acc7b41b MD |
1154 | /* |
1155 | * Add channel(s) and event(s) to newly registered apps | |
1156 | * from lttng global UST domain. | |
1157 | */ | |
1158 | update_ust_app(ust_cmd.sock); | |
1159 | ||
f2ca2e25 | 1160 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1161 | if (ret < 0) { |
1162 | /* | |
1163 | * If the registration is not possible, we simply | |
1164 | * unregister the apps and continue | |
1165 | */ | |
56fff090 | 1166 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1167 | } else { |
1168 | /* | |
1169 | * We just need here to monitor the close of the UST | |
1170 | * socket and poll set monitor those by default. | |
1171 | */ | |
1172 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1173 | if (ret < 0) { | |
1174 | goto error; | |
1175 | } | |
1176 | ||
54d01ffb DG |
1177 | DBG("Apps with sock %d added to poll set", |
1178 | ust_cmd.sock); | |
5eb91c98 | 1179 | } |
487cf67c | 1180 | |
5eb91c98 | 1181 | break; |
0177d773 | 1182 | } |
5eb91c98 DG |
1183 | } else { |
1184 | /* | |
54d01ffb DG |
1185 | * At this point, we know that a registered application made |
1186 | * the event at poll_wait. | |
5eb91c98 DG |
1187 | */ |
1188 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1189 | /* Removing from the poll set */ | |
1190 | ret = lttng_poll_del(&events, pollfd); | |
1191 | if (ret < 0) { | |
1192 | goto error; | |
1193 | } | |
099e26bd | 1194 | |
b9d9b220 | 1195 | /* Socket closed on remote end. */ |
56fff090 | 1196 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1197 | break; |
1198 | } | |
099e26bd DG |
1199 | } |
1200 | } | |
099e26bd DG |
1201 | } |
1202 | ||
1203 | error: | |
1204 | DBG("Application communication apps dying"); | |
1205 | close(apps_cmd_pipe[0]); | |
1206 | close(apps_cmd_pipe[1]); | |
1207 | ||
5eb91c98 | 1208 | lttng_poll_clean(&events); |
099e26bd | 1209 | |
f6a9efaa DG |
1210 | rcu_thread_offline(); |
1211 | rcu_unregister_thread(); | |
099e26bd DG |
1212 | return NULL; |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Dispatch request from the registration threads to the application | |
1217 | * communication thread. | |
1218 | */ | |
1219 | static void *thread_dispatch_ust_registration(void *data) | |
1220 | { | |
1221 | int ret; | |
1222 | struct cds_wfq_node *node; | |
1223 | struct ust_command *ust_cmd = NULL; | |
1224 | ||
1225 | DBG("[thread] Dispatch UST command started"); | |
1226 | ||
1227 | while (!dispatch_thread_exit) { | |
1228 | /* Atomically prepare the queue futex */ | |
1229 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1230 | ||
1231 | do { | |
1232 | /* Dequeue command for registration */ | |
1233 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1234 | if (node == NULL) { | |
00a17c97 | 1235 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1236 | /* Continue thread execution */ |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1241 | ||
2f50c8a3 DG |
1242 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1243 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1244 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1245 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1246 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1247 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1248 | /* |
1249 | * Inform apps thread of the new application registration. This | |
1250 | * call is blocking so we can be assured that the data will be read | |
1251 | * at some point in time or wait to the end of the world :) | |
1252 | */ | |
1253 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1254 | sizeof(struct ust_command)); | |
1255 | if (ret < 0) { | |
1256 | perror("write apps cmd pipe"); | |
1257 | if (errno == EBADF) { | |
1258 | /* | |
1259 | * We can't inform the application thread to process | |
1260 | * registration. We will exit or else application | |
1261 | * registration will not occur and tracing will never | |
1262 | * start. | |
1263 | */ | |
1264 | goto error; | |
1265 | } | |
1266 | } | |
1267 | free(ust_cmd); | |
1268 | } while (node != NULL); | |
1269 | ||
1270 | /* Futex wait on queue. Blocking call on futex() */ | |
1271 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1272 | } | |
1273 | ||
1274 | error: | |
1275 | DBG("Dispatch thread dying"); | |
1276 | return NULL; | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * This thread manage application registration. | |
1281 | */ | |
1282 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1283 | { |
5eb91c98 DG |
1284 | int sock = 0, i, ret, pollfd; |
1285 | uint32_t revents, nb_fd; | |
1286 | struct lttng_poll_event events; | |
099e26bd DG |
1287 | /* |
1288 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1289 | * freed in the manage apps thread. | |
1290 | */ | |
1291 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1292 | |
099e26bd | 1293 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1294 | |
1295 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1296 | if (ret < 0) { | |
1297 | goto error; | |
1298 | } | |
1299 | ||
5eb91c98 DG |
1300 | /* |
1301 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1302 | * more will be added to this poll set. | |
1303 | */ | |
1304 | ret = create_thread_poll_set(&events, 2); | |
1305 | if (ret < 0) { | |
1306 | goto error; | |
1307 | } | |
273ea72c | 1308 | |
5eb91c98 DG |
1309 | /* Add the application registration socket */ |
1310 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1311 | if (ret < 0) { | |
1312 | goto error; | |
1313 | } | |
273ea72c | 1314 | |
1d4b027a | 1315 | /* Notify all applications to register */ |
0fdd1e2c DG |
1316 | ret = notify_ust_apps(1); |
1317 | if (ret < 0) { | |
1318 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1319 | "Execution continues but there might be problem for already\n" |
1320 | "running applications that wishes to register."); | |
0fdd1e2c | 1321 | } |
1d4b027a DG |
1322 | |
1323 | while (1) { | |
1324 | DBG("Accepting application registration"); | |
273ea72c | 1325 | |
5eb91c98 DG |
1326 | nb_fd = LTTNG_POLL_GETNB(&events); |
1327 | ||
273ea72c | 1328 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1329 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1330 | if (ret < 0) { |
273ea72c DG |
1331 | goto error; |
1332 | } | |
1333 | ||
5eb91c98 DG |
1334 | for (i = 0; i < nb_fd; i++) { |
1335 | /* Fetch once the poll data */ | |
1336 | revents = LTTNG_POLL_GETEV(&events, i); | |
1337 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1338 | |
5eb91c98 DG |
1339 | /* Thread quit pipe has been closed. Killing thread. */ |
1340 | ret = check_thread_quit_pipe(pollfd, revents); | |
1341 | if (ret) { | |
90014c57 DG |
1342 | goto error; |
1343 | } | |
1d4b027a | 1344 | |
5eb91c98 DG |
1345 | /* Event on the registration socket */ |
1346 | if (pollfd == apps_sock) { | |
1347 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1348 | ERR("Register apps socket poll error"); | |
1349 | goto error; | |
1350 | } else if (revents & LPOLLIN) { | |
1351 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1352 | if (sock < 0) { | |
1353 | goto error; | |
1354 | } | |
099e26bd | 1355 | |
5eb91c98 | 1356 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1357 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1358 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1359 | perror("ust command zmalloc"); |
5eb91c98 DG |
1360 | goto error; |
1361 | } | |
1d4b027a | 1362 | |
5eb91c98 DG |
1363 | /* |
1364 | * Using message-based transmissions to ensure we don't | |
1365 | * have to deal with partially received messages. | |
1366 | */ | |
1367 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1368 | sizeof(struct ust_register_msg)); | |
1369 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1370 | if (ret < 0) { | |
1371 | perror("lttcomm_recv_unix_sock register apps"); | |
1372 | } else { | |
1373 | ERR("Wrong size received on apps register"); | |
1374 | } | |
1375 | free(ust_cmd); | |
1376 | close(sock); | |
1377 | continue; | |
1378 | } | |
099e26bd | 1379 | |
5eb91c98 | 1380 | ust_cmd->sock = sock; |
099e26bd | 1381 | |
5eb91c98 DG |
1382 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1383 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1384 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1385 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1386 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1387 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1388 | |
5eb91c98 DG |
1389 | /* |
1390 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1391 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1392 | */ |
1393 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1394 | ||
1395 | /* | |
1396 | * Wake the registration queue futex. Implicit memory | |
1397 | * barrier with the exchange in cds_wfq_enqueue. | |
1398 | */ | |
1399 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1400 | } | |
1401 | } | |
90014c57 | 1402 | } |
1d4b027a DG |
1403 | } |
1404 | ||
1405 | error: | |
0fdd1e2c DG |
1406 | DBG("UST Registration thread dying"); |
1407 | ||
1408 | /* Notify that the registration thread is gone */ | |
1409 | notify_ust_apps(0); | |
1410 | ||
1411 | close(apps_sock); | |
1412 | close(sock); | |
273ea72c | 1413 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1414 | |
5eb91c98 DG |
1415 | lttng_poll_clean(&events); |
1416 | ||
1d4b027a DG |
1417 | return NULL; |
1418 | } | |
1419 | ||
8c0faa1d | 1420 | /* |
3bd1e081 | 1421 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1422 | * exec or it will fails. |
8c0faa1d | 1423 | */ |
3bd1e081 | 1424 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1425 | { |
1426 | int ret; | |
ee0b0061 DG |
1427 | struct timespec timeout; |
1428 | ||
1429 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1430 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1431 | |
1432 | /* Setup semaphore */ | |
3bd1e081 | 1433 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1434 | if (ret < 0) { |
3bd1e081 | 1435 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1436 | goto error; |
1437 | } | |
8c0faa1d | 1438 | |
3bd1e081 MD |
1439 | ret = pthread_create(&consumer_data->thread, NULL, |
1440 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1441 | if (ret != 0) { |
3bd1e081 | 1442 | PERROR("pthread_create consumer"); |
ee0b0061 | 1443 | ret = -1; |
8c0faa1d DG |
1444 | goto error; |
1445 | } | |
1446 | ||
ee0b0061 DG |
1447 | /* Get time for sem_timedwait absolute timeout */ |
1448 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1449 | if (ret < 0) { | |
3bd1e081 | 1450 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1451 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1452 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1453 | } else { |
1454 | /* Normal timeout if the gettime was successful */ | |
1455 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1456 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1457 | } |
8c0faa1d | 1458 | |
ee0b0061 DG |
1459 | if (ret < 0) { |
1460 | if (errno == ETIMEDOUT) { | |
1461 | /* | |
1462 | * Call has timed out so we kill the kconsumerd_thread and return | |
1463 | * an error. | |
1464 | */ | |
3bd1e081 MD |
1465 | ERR("The consumer thread was never ready. Killing it"); |
1466 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1467 | if (ret < 0) { |
3bd1e081 | 1468 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1469 | } |
1470 | } else { | |
3bd1e081 | 1471 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1472 | } |
1473 | goto error; | |
1474 | } | |
1475 | ||
3bd1e081 MD |
1476 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1477 | if (consumer_data->pid == 0) { | |
712ea556 | 1478 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1479 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1480 | goto error; |
1481 | } | |
3bd1e081 | 1482 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1483 | |
8c0faa1d DG |
1484 | return 0; |
1485 | ||
1486 | error: | |
1487 | return ret; | |
1488 | } | |
1489 | ||
d9800920 | 1490 | /* |
3bd1e081 | 1491 | * Join consumer thread |
d9800920 | 1492 | */ |
3bd1e081 | 1493 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1494 | { |
1495 | void *status; | |
1496 | int ret; | |
1497 | ||
3bd1e081 MD |
1498 | if (consumer_data->pid != 0) { |
1499 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1500 | if (ret) { |
3bd1e081 | 1501 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1502 | return ret; |
1503 | } | |
3bd1e081 | 1504 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1505 | } else { |
1506 | return 0; | |
1507 | } | |
1508 | } | |
1509 | ||
8c0faa1d | 1510 | /* |
3bd1e081 | 1511 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1512 | * |
d063d709 | 1513 | * Return pid if successful else -1. |
8c0faa1d | 1514 | */ |
3bd1e081 | 1515 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1516 | { |
1517 | int ret; | |
1518 | pid_t pid; | |
94c55f17 | 1519 | const char *consumer_to_use; |
53086306 | 1520 | const char *verbosity; |
94c55f17 | 1521 | struct stat st; |
8c0faa1d | 1522 | |
3bd1e081 | 1523 | DBG("Spawning consumerd"); |
c49dc785 | 1524 | |
8c0faa1d DG |
1525 | pid = fork(); |
1526 | if (pid == 0) { | |
1527 | /* | |
3bd1e081 | 1528 | * Exec consumerd. |
8c0faa1d | 1529 | */ |
daee5345 | 1530 | if (opt_verbose_consumer) { |
53086306 DG |
1531 | verbosity = "--verbose"; |
1532 | } else { | |
1533 | verbosity = "--quiet"; | |
1534 | } | |
3bd1e081 MD |
1535 | switch (consumer_data->type) { |
1536 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1537 | /* |
f806231f MD |
1538 | * Find out which consumerd to execute. We will |
1539 | * first try the 64-bit path, then the | |
1540 | * sessiond's installation directory, and | |
1541 | * fallback on the 32-bit one, | |
94c55f17 | 1542 | */ |
63a799e8 AM |
1543 | DBG3("Looking for a kernel consumer at these locations:"); |
1544 | DBG3(" 1) %s", consumerd64_bin); | |
1545 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1546 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1547 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1548 | DBG3("Found location #1"); |
94c55f17 | 1549 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1550 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1551 | DBG3("Found location #2"); |
94c55f17 | 1552 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1553 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1554 | DBG3("Found location #3"); |
eb1e0bd4 | 1555 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1556 | } else { |
63a799e8 | 1557 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1558 | break; |
1559 | } | |
1560 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1561 | execl(consumer_to_use, | |
1562 | "lttng-consumerd", verbosity, "-k", | |
1563 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1564 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1565 | NULL); | |
3bd1e081 | 1566 | break; |
7753dea8 MD |
1567 | case LTTNG_CONSUMER64_UST: |
1568 | { | |
b1e0b6b6 | 1569 | char *tmpnew = NULL; |
8f4905da MD |
1570 | |
1571 | if (consumerd64_libdir[0] != '\0') { | |
1572 | char *tmp; | |
1573 | size_t tmplen; | |
1574 | ||
1575 | tmp = getenv("LD_LIBRARY_PATH"); | |
1576 | if (!tmp) { | |
1577 | tmp = ""; | |
1578 | } | |
1579 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1580 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1581 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1582 | if (!tmpnew) { | |
1583 | ret = -ENOMEM; | |
1584 | goto error; | |
1585 | } | |
1586 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1587 | strcat(tmpnew, consumerd64_libdir); | |
1588 | if (tmp[0] != '\0') { | |
1589 | strcat(tmpnew, ":"); | |
1590 | strcat(tmpnew, tmp); | |
1591 | } | |
1592 | ret = putenv(tmpnew); | |
1593 | if (ret) { | |
1594 | ret = -errno; | |
1595 | goto error; | |
1596 | } | |
1597 | } | |
94c55f17 | 1598 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1599 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1600 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1601 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1602 | NULL); | |
8f4905da MD |
1603 | if (consumerd64_libdir[0] != '\0') { |
1604 | free(tmpnew); | |
1605 | } | |
1606 | if (ret) { | |
1607 | goto error; | |
1608 | } | |
3bd1e081 | 1609 | break; |
7753dea8 MD |
1610 | } |
1611 | case LTTNG_CONSUMER32_UST: | |
1612 | { | |
937dde8e | 1613 | char *tmpnew = NULL; |
8f4905da MD |
1614 | |
1615 | if (consumerd32_libdir[0] != '\0') { | |
1616 | char *tmp; | |
1617 | size_t tmplen; | |
1618 | ||
1619 | tmp = getenv("LD_LIBRARY_PATH"); | |
1620 | if (!tmp) { | |
1621 | tmp = ""; | |
1622 | } | |
1623 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1624 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1625 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1626 | if (!tmpnew) { | |
1627 | ret = -ENOMEM; | |
1628 | goto error; | |
1629 | } | |
1630 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1631 | strcat(tmpnew, consumerd32_libdir); | |
1632 | if (tmp[0] != '\0') { | |
1633 | strcat(tmpnew, ":"); | |
1634 | strcat(tmpnew, tmp); | |
1635 | } | |
1636 | ret = putenv(tmpnew); | |
1637 | if (ret) { | |
1638 | ret = -errno; | |
1639 | goto error; | |
1640 | } | |
1641 | } | |
94c55f17 | 1642 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1643 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1644 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1645 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1646 | NULL); | |
8f4905da MD |
1647 | if (consumerd32_libdir[0] != '\0') { |
1648 | free(tmpnew); | |
1649 | } | |
1650 | if (ret) { | |
1651 | goto error; | |
1652 | } | |
7753dea8 MD |
1653 | break; |
1654 | } | |
3bd1e081 MD |
1655 | default: |
1656 | perror("unknown consumer type"); | |
1657 | exit(EXIT_FAILURE); | |
1658 | } | |
8c0faa1d DG |
1659 | if (errno != 0) { |
1660 | perror("kernel start consumer exec"); | |
1661 | } | |
1662 | exit(EXIT_FAILURE); | |
1663 | } else if (pid > 0) { | |
1664 | ret = pid; | |
8c0faa1d | 1665 | } else { |
3bd1e081 | 1666 | perror("start consumer fork"); |
8c0faa1d | 1667 | ret = -errno; |
8c0faa1d | 1668 | } |
8f4905da | 1669 | error: |
8c0faa1d DG |
1670 | return ret; |
1671 | } | |
1672 | ||
693bd40b | 1673 | /* |
3bd1e081 | 1674 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1675 | */ |
3bd1e081 | 1676 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1677 | { |
1678 | int ret; | |
1679 | ||
3bd1e081 MD |
1680 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1681 | if (consumer_data->pid != 0) { | |
1682 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1683 | goto end; |
1684 | } | |
693bd40b | 1685 | |
3bd1e081 | 1686 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1687 | if (ret < 0) { |
3bd1e081 MD |
1688 | ERR("Spawning consumerd failed"); |
1689 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1690 | goto error; |
693bd40b | 1691 | } |
c49dc785 | 1692 | |
3bd1e081 MD |
1693 | /* Setting up the consumer_data pid */ |
1694 | consumer_data->pid = ret; | |
48842b30 | 1695 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1696 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1697 | |
3bd1e081 MD |
1698 | DBG2("Spawning consumer control thread"); |
1699 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1700 | if (ret < 0) { |
3bd1e081 | 1701 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1702 | goto error; |
1703 | } | |
1704 | ||
c49dc785 | 1705 | end: |
693bd40b DG |
1706 | return 0; |
1707 | ||
1708 | error: | |
1709 | return ret; | |
1710 | } | |
1711 | ||
b73401da | 1712 | /* |
d063d709 | 1713 | * modprobe_kernel_modules |
b73401da DG |
1714 | */ |
1715 | static int modprobe_kernel_modules(void) | |
1716 | { | |
ab147185 | 1717 | int ret = 0, i; |
b73401da DG |
1718 | char modprobe[256]; |
1719 | ||
ab147185 MD |
1720 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1721 | ret = snprintf(modprobe, sizeof(modprobe), | |
1722 | "/sbin/modprobe %s%s", | |
24b487b8 | 1723 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1724 | kernel_modules_list[i].name); |
b73401da DG |
1725 | if (ret < 0) { |
1726 | perror("snprintf modprobe"); | |
1727 | goto error; | |
1728 | } | |
ab147185 | 1729 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1730 | ret = system(modprobe); |
ab147185 MD |
1731 | if (ret == -1) { |
1732 | ERR("Unable to launch modprobe for module %s", | |
1733 | kernel_modules_list[i].name); | |
1734 | } else if (kernel_modules_list[i].required | |
d9800920 | 1735 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1736 | ERR("Unable to load module %s", |
1737 | kernel_modules_list[i].name); | |
1738 | } else { | |
1739 | DBG("Modprobe successfully %s", | |
1740 | kernel_modules_list[i].name); | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | error: | |
1745 | return ret; | |
1746 | } | |
1747 | ||
b73401da | 1748 | /* |
d063d709 | 1749 | * mount_debugfs |
b73401da DG |
1750 | */ |
1751 | static int mount_debugfs(char *path) | |
1752 | { | |
1753 | int ret; | |
1754 | char *type = "debugfs"; | |
1755 | ||
67f747d8 | 1756 | ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1757 | if (ret < 0) { |
7272acf5 | 1758 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1759 | goto error; |
1760 | } | |
1761 | ||
1762 | ret = mount(type, path, type, 0, NULL); | |
1763 | if (ret < 0) { | |
7272acf5 | 1764 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1765 | goto error; |
1766 | } | |
1767 | ||
1768 | DBG("Mounted debugfs successfully at %s", path); | |
1769 | ||
1770 | error: | |
1771 | return ret; | |
1772 | } | |
1773 | ||
8c0faa1d | 1774 | /* |
d063d709 | 1775 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1776 | */ |
f3ed775e | 1777 | static void init_kernel_tracer(void) |
8c0faa1d | 1778 | { |
b73401da DG |
1779 | int ret; |
1780 | char *proc_mounts = "/proc/mounts"; | |
1781 | char line[256]; | |
684d34d2 | 1782 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1783 | FILE *fp; |
1784 | ||
1785 | /* Detect debugfs */ | |
1786 | fp = fopen(proc_mounts, "r"); | |
1787 | if (fp == NULL) { | |
1788 | ERR("Unable to probe %s", proc_mounts); | |
1789 | goto error; | |
1790 | } | |
1791 | ||
1792 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1793 | if (strstr(line, "debugfs") != NULL) { | |
1794 | /* Remove first string */ | |
1795 | strtok(line, " "); | |
1796 | /* Dup string here so we can reuse line later on */ | |
1797 | debugfs_path = strdup(strtok(NULL, " ")); | |
1798 | DBG("Got debugfs path : %s", debugfs_path); | |
1799 | break; | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | fclose(fp); | |
1804 | ||
1805 | /* Mount debugfs if needded */ | |
1806 | if (debugfs_path == NULL) { | |
1807 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1808 | if (ret < 0) { | |
1809 | perror("asprintf debugfs path"); | |
1810 | goto error; | |
1811 | } | |
1812 | ret = mount_debugfs(debugfs_path); | |
1813 | if (ret < 0) { | |
7272acf5 | 1814 | perror("Cannot mount debugfs"); |
b73401da DG |
1815 | goto error; |
1816 | } | |
1817 | } | |
1818 | ||
1819 | /* Modprobe lttng kernel modules */ | |
1820 | ret = modprobe_kernel_modules(); | |
1821 | if (ret < 0) { | |
1822 | goto error; | |
1823 | } | |
1824 | ||
1825 | /* Setup lttng kernel path */ | |
1826 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1827 | if (ret < 0) { | |
1828 | perror("asprintf lttng path"); | |
1829 | goto error; | |
1830 | } | |
1831 | ||
1832 | /* Open debugfs lttng */ | |
1833 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1834 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1835 | DBG("Failed to open %s", lttng_path); |
1836 | goto error; | |
8c0faa1d DG |
1837 | } |
1838 | ||
b73401da DG |
1839 | free(lttng_path); |
1840 | free(debugfs_path); | |
f3ed775e | 1841 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1842 | return; |
1843 | ||
1844 | error: | |
1845 | if (lttng_path) { | |
1846 | free(lttng_path); | |
1847 | } | |
1848 | if (debugfs_path) { | |
1849 | free(debugfs_path); | |
1850 | } | |
1851 | WARN("No kernel tracer available"); | |
1852 | kernel_tracer_fd = 0; | |
1853 | return; | |
f3ed775e | 1854 | } |
33a2b854 | 1855 | |
f3ed775e | 1856 | /* |
54d01ffb | 1857 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1858 | */ |
54d01ffb | 1859 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1860 | { |
f40799e8 | 1861 | int ret = 0; |
8c0faa1d | 1862 | |
3bd1e081 | 1863 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1864 | /* |
54d01ffb DG |
1865 | * Assign default kernel consumer socket if no consumer assigned to the |
1866 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1867 | * an extra security check. | |
d9800920 DG |
1868 | */ |
1869 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1870 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1871 | } |
1872 | ||
2bdd86d4 | 1873 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1874 | if (ret < 0) { |
f3ed775e DG |
1875 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1876 | goto error; | |
1877 | } | |
1d4b027a | 1878 | |
3bd1e081 | 1879 | session->consumer_fds_sent = 1; |
f3ed775e | 1880 | } |
1d4b027a DG |
1881 | |
1882 | error: | |
1883 | return ret; | |
8c0faa1d DG |
1884 | } |
1885 | ||
0177d773 DG |
1886 | /* |
1887 | * Create an UST session and add it to the session ust list. | |
1888 | */ | |
44d3bd01 | 1889 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1890 | struct lttng_domain *domain) |
0177d773 | 1891 | { |
13384287 | 1892 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1893 | int ret; |
44d3bd01 DG |
1894 | |
1895 | switch (domain->type) { | |
48842b30 | 1896 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1897 | break; |
1898 | default: | |
13384287 | 1899 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1900 | goto error; |
1901 | } | |
0177d773 DG |
1902 | |
1903 | DBG("Creating UST session"); | |
1904 | ||
a991f516 | 1905 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1906 | if (lus == NULL) { |
44d3bd01 | 1907 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1908 | goto error; |
1909 | } | |
1910 | ||
67f747d8 | 1911 | ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1912 | session->uid, session->gid); |
0177d773 DG |
1913 | if (ret < 0) { |
1914 | if (ret != -EEXIST) { | |
1915 | ERR("Trace directory creation error"); | |
44d3bd01 | 1916 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1917 | goto error; |
1918 | } | |
1919 | } | |
1920 | ||
f6a9efaa DG |
1921 | /* The domain type dictate different actions on session creation */ |
1922 | switch (domain->type) { | |
48842b30 DG |
1923 | case LTTNG_DOMAIN_UST: |
1924 | /* No ustctl for the global UST domain */ | |
1925 | break; | |
1926 | default: | |
36dc12cc | 1927 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1928 | goto error; |
0177d773 | 1929 | } |
6df2e2c9 MD |
1930 | lus->uid = session->uid; |
1931 | lus->gid = session->gid; | |
f6a9efaa | 1932 | session->ust_session = lus; |
44d3bd01 DG |
1933 | |
1934 | return LTTCOMM_OK; | |
0177d773 DG |
1935 | |
1936 | error: | |
1937 | free(lus); | |
1938 | return ret; | |
1939 | } | |
1940 | ||
333f285e | 1941 | /* |
d063d709 | 1942 | * Create a kernel tracer session then create the default channel. |
333f285e | 1943 | */ |
6df2e2c9 | 1944 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1945 | { |
f3ed775e | 1946 | int ret; |
f3ed775e DG |
1947 | |
1948 | DBG("Creating kernel session"); | |
1949 | ||
1950 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1951 | if (ret < 0) { | |
1952 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1953 | goto error; | |
333f285e DG |
1954 | } |
1955 | ||
d9800920 | 1956 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1957 | if (kconsumer_data.cmd_sock) { |
1958 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1959 | } |
1960 | ||
67f747d8 | 1961 | ret = mkdir_recursive_run_as(session->kernel_session->trace_path, |
6df2e2c9 | 1962 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1963 | if (ret < 0) { |
996b65c8 | 1964 | if (ret != -EEXIST) { |
7a485870 DG |
1965 | ERR("Trace directory creation error"); |
1966 | goto error; | |
1967 | } | |
1968 | } | |
6df2e2c9 MD |
1969 | session->kernel_session->uid = session->uid; |
1970 | session->kernel_session->gid = session->gid; | |
7a485870 | 1971 | |
f3ed775e DG |
1972 | error: |
1973 | return ret; | |
333f285e DG |
1974 | } |
1975 | ||
8e0af1b4 MD |
1976 | /* |
1977 | * Check if the UID or GID match the session. Root user has access to | |
1978 | * all sessions. | |
1979 | */ | |
1980 | static int session_access_ok(struct ltt_session *session, | |
1981 | uid_t uid, gid_t gid) | |
1982 | { | |
1983 | if (uid != session->uid && gid != session->gid | |
1984 | && uid != 0) { | |
1985 | return 0; | |
1986 | } else { | |
1987 | return 1; | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1992 | { | |
1993 | unsigned int i = 0; | |
1994 | struct ltt_session *session; | |
1995 | ||
1996 | DBG("Counting number of available session for UID %d GID %d", | |
1997 | uid, gid); | |
1998 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1999 | /* | |
2000 | * Only list the sessions the user can control. | |
2001 | */ | |
2002 | if (!session_access_ok(session, uid, gid)) { | |
2003 | continue; | |
2004 | } | |
2005 | i++; | |
2006 | } | |
2007 | return i; | |
2008 | } | |
2009 | ||
6c9cc2ab DG |
2010 | /* |
2011 | * Using the session list, filled a lttng_session array to send back to the | |
2012 | * client for session listing. | |
2013 | * | |
2014 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2015 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2016 | */ |
8e0af1b4 MD |
2017 | static void list_lttng_sessions(struct lttng_session *sessions, |
2018 | uid_t uid, gid_t gid) | |
6c9cc2ab | 2019 | { |
8e0af1b4 | 2020 | unsigned int i = 0; |
6c9cc2ab DG |
2021 | struct ltt_session *session; |
2022 | ||
8e0af1b4 MD |
2023 | DBG("Getting all available session for UID %d GID %d", |
2024 | uid, gid); | |
6c9cc2ab DG |
2025 | /* |
2026 | * Iterate over session list and append data after the control struct in | |
2027 | * the buffer. | |
2028 | */ | |
2029 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2030 | /* |
2031 | * Only list the sessions the user can control. | |
2032 | */ | |
2033 | if (!session_access_ok(session, uid, gid)) { | |
2034 | continue; | |
2035 | } | |
6c9cc2ab | 2036 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2037 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2038 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2039 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2040 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2041 | i++; |
2042 | } | |
2043 | } | |
2044 | ||
9f19cc17 DG |
2045 | /* |
2046 | * Fill lttng_channel array of all channels. | |
2047 | */ | |
b551a063 | 2048 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2049 | struct lttng_channel *channels) |
2050 | { | |
2051 | int i = 0; | |
2052 | struct ltt_kernel_channel *kchan; | |
2053 | ||
2054 | DBG("Listing channels for session %s", session->name); | |
2055 | ||
b551a063 DG |
2056 | switch (domain) { |
2057 | case LTTNG_DOMAIN_KERNEL: | |
2058 | /* Kernel channels */ | |
2059 | if (session->kernel_session != NULL) { | |
2060 | cds_list_for_each_entry(kchan, | |
2061 | &session->kernel_session->channel_list.head, list) { | |
2062 | /* Copy lttng_channel struct to array */ | |
2063 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2064 | channels[i].enabled = kchan->enabled; | |
2065 | i++; | |
2066 | } | |
2067 | } | |
2068 | break; | |
2069 | case LTTNG_DOMAIN_UST: | |
2070 | { | |
bec39940 | 2071 | struct lttng_ht_iter iter; |
b551a063 DG |
2072 | struct ltt_ust_channel *uchan; |
2073 | ||
bec39940 DG |
2074 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2075 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2076 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2077 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2078 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2079 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2080 | channels[i].attr.switch_timer_interval = | |
2081 | uchan->attr.switch_timer_interval; | |
2082 | channels[i].attr.read_timer_interval = | |
2083 | uchan->attr.read_timer_interval; | |
aea829b3 | 2084 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2085 | switch (uchan->attr.output) { |
2086 | case LTTNG_UST_MMAP: | |
2087 | default: | |
2088 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2089 | break; | |
2090 | } | |
befe0905 | 2091 | i++; |
b551a063 DG |
2092 | } |
2093 | break; | |
2094 | } | |
2095 | default: | |
2096 | break; | |
2097 | } | |
2098 | } | |
2099 | ||
2100 | /* | |
2101 | * Create a list of ust global domain events. | |
2102 | */ | |
2103 | static int list_lttng_ust_global_events(char *channel_name, | |
2104 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2105 | { | |
2106 | int i = 0, ret = 0; | |
2107 | unsigned int nb_event = 0; | |
bec39940 DG |
2108 | struct lttng_ht_iter iter; |
2109 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2110 | struct ltt_ust_channel *uchan; |
2111 | struct ltt_ust_event *uevent; | |
2112 | struct lttng_event *tmp; | |
2113 | ||
2114 | DBG("Listing UST global events for channel %s", channel_name); | |
2115 | ||
2116 | rcu_read_lock(); | |
2117 | ||
bec39940 DG |
2118 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2119 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2120 | if (node == NULL) { |
2121 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2122 | goto error; | |
b551a063 DG |
2123 | } |
2124 | ||
bec39940 | 2125 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2126 | |
bec39940 | 2127 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2128 | |
b551a063 DG |
2129 | if (nb_event == 0) { |
2130 | ret = nb_event; | |
2131 | goto error; | |
2132 | } | |
2133 | ||
2134 | DBG3("Listing UST global %d events", nb_event); | |
2135 | ||
2136 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2137 | if (tmp == NULL) { | |
2138 | ret = -LTTCOMM_FATAL; | |
2139 | goto error; | |
2140 | } | |
2141 | ||
bec39940 | 2142 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2143 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2144 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2145 | tmp[i].enabled = uevent->enabled; | |
2146 | switch (uevent->attr.instrumentation) { | |
2147 | case LTTNG_UST_TRACEPOINT: | |
2148 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2149 | break; | |
2150 | case LTTNG_UST_PROBE: | |
2151 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2152 | break; | |
2153 | case LTTNG_UST_FUNCTION: | |
2154 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2155 | break; | |
ac3bd9c0 | 2156 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2157 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2158 | break; |
9f19cc17 | 2159 | } |
d7b75b30 | 2160 | i++; |
9f19cc17 DG |
2161 | } |
2162 | ||
b551a063 DG |
2163 | ret = nb_event; |
2164 | *events = tmp; | |
2165 | ||
2166 | error: | |
2167 | rcu_read_unlock(); | |
2168 | return ret; | |
9f19cc17 DG |
2169 | } |
2170 | ||
2171 | /* | |
b551a063 | 2172 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2173 | */ |
b551a063 DG |
2174 | static int list_lttng_kernel_events(char *channel_name, |
2175 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2176 | { |
b551a063 DG |
2177 | int i = 0, ret; |
2178 | unsigned int nb_event; | |
9f19cc17 | 2179 | struct ltt_kernel_event *event; |
b551a063 DG |
2180 | struct ltt_kernel_channel *kchan; |
2181 | ||
2182 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2183 | if (kchan == NULL) { | |
2184 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2185 | goto error; | |
2186 | } | |
2187 | ||
2188 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2189 | |
2190 | DBG("Listing events for channel %s", kchan->channel->name); | |
2191 | ||
b551a063 DG |
2192 | if (nb_event == 0) { |
2193 | ret = nb_event; | |
2194 | goto error; | |
2195 | } | |
2196 | ||
2197 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2198 | if (*events == NULL) { | |
2199 | ret = LTTCOMM_FATAL; | |
2200 | goto error; | |
2201 | } | |
2202 | ||
9f19cc17 DG |
2203 | /* Kernel channels */ |
2204 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2205 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2206 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2207 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2208 | switch (event->event->instrumentation) { |
2209 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2210 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2211 | break; |
2212 | case LTTNG_KERNEL_KPROBE: | |
2213 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2214 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2215 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2216 | sizeof(struct lttng_kernel_kprobe)); |
2217 | break; | |
2218 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2219 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2220 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2221 | sizeof(struct lttng_kernel_function)); |
2222 | break; | |
0133c199 | 2223 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2224 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2225 | break; |
a54bd42d | 2226 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2227 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2228 | break; |
7a3d1328 MD |
2229 | case LTTNG_KERNEL_ALL: |
2230 | assert(0); | |
2231 | break; | |
9f19cc17 DG |
2232 | } |
2233 | i++; | |
2234 | } | |
b551a063 DG |
2235 | |
2236 | return nb_event; | |
2237 | ||
2238 | error: | |
2239 | return ret; | |
9f19cc17 DG |
2240 | } |
2241 | ||
fac6795d | 2242 | /* |
54d01ffb | 2243 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2244 | */ |
54d01ffb DG |
2245 | static int cmd_disable_channel(struct ltt_session *session, |
2246 | int domain, char *channel_name) | |
fac6795d | 2247 | { |
54d01ffb | 2248 | int ret; |
78f0bacd DG |
2249 | struct ltt_ust_session *usess; |
2250 | ||
2251 | usess = session->ust_session; | |
379473d2 | 2252 | |
54d01ffb | 2253 | switch (domain) { |
78f0bacd DG |
2254 | case LTTNG_DOMAIN_KERNEL: |
2255 | { | |
2256 | ret = channel_kernel_disable(session->kernel_session, | |
2257 | channel_name); | |
2258 | if (ret != LTTCOMM_OK) { | |
2259 | goto error; | |
2260 | } | |
54d01ffb | 2261 | |
78f0bacd DG |
2262 | kernel_wait_quiescent(kernel_tracer_fd); |
2263 | break; | |
2264 | } | |
2265 | case LTTNG_DOMAIN_UST: | |
2266 | { | |
2267 | struct ltt_ust_channel *uchan; | |
bec39940 | 2268 | struct lttng_ht *chan_ht; |
78f0bacd | 2269 | |
7885e399 DG |
2270 | chan_ht = usess->domain_global.channels; |
2271 | ||
2272 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2273 | if (uchan == NULL) { |
2274 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2275 | goto error; |
78f0bacd DG |
2276 | } |
2277 | ||
7885e399 DG |
2278 | ret = channel_ust_disable(usess, domain, uchan); |
2279 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2280 | goto error; |
2281 | } | |
78f0bacd DG |
2282 | break; |
2283 | } | |
2284 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2285 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2286 | case LTTNG_DOMAIN_UST_PID: | |
2287 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2288 | goto error; | |
2289 | default: | |
2290 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2291 | goto error; | |
20fe2104 DG |
2292 | } |
2293 | ||
54d01ffb | 2294 | ret = LTTCOMM_OK; |
d65106b1 | 2295 | |
54d01ffb DG |
2296 | error: |
2297 | return ret; | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2302 | */ | |
44d3bd01 | 2303 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2304 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2305 | { |
2306 | int ret; | |
f6a9efaa | 2307 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2308 | struct lttng_ht *chan_ht; |
f6a9efaa | 2309 | |
5d56b5aa | 2310 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2311 | |
aea829b3 | 2312 | switch (domain) { |
44d3bd01 DG |
2313 | case LTTNG_DOMAIN_KERNEL: |
2314 | { | |
2315 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2316 | |
44d3bd01 DG |
2317 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2318 | session->kernel_session); | |
2319 | if (kchan == NULL) { | |
2320 | ret = channel_kernel_create(session->kernel_session, | |
2321 | attr, kernel_poll_pipe[1]); | |
2322 | } else { | |
2323 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2324 | } | |
2325 | ||
2326 | if (ret != LTTCOMM_OK) { | |
2327 | goto error; | |
2328 | } | |
2329 | ||
2330 | kernel_wait_quiescent(kernel_tracer_fd); | |
2331 | break; | |
2332 | } | |
f6a9efaa DG |
2333 | case LTTNG_DOMAIN_UST: |
2334 | { | |
2335 | struct ltt_ust_channel *uchan; | |
2336 | ||
7885e399 | 2337 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2338 | |
7885e399 | 2339 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2340 | if (uchan == NULL) { |
7885e399 | 2341 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2342 | } else { |
7885e399 | 2343 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2344 | } |
f6a9efaa DG |
2345 | break; |
2346 | } | |
78f0bacd DG |
2347 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2348 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2349 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2350 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2351 | goto error; | |
44d3bd01 DG |
2352 | default: |
2353 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2354 | goto error; | |
54d01ffb DG |
2355 | } |
2356 | ||
54d01ffb DG |
2357 | error: |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2363 | */ | |
2364 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2365 | char *channel_name, char *event_name) | |
2366 | { | |
2367 | int ret; | |
54d01ffb DG |
2368 | |
2369 | switch (domain) { | |
2370 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2371 | { |
2372 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2373 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2374 | |
b0a40d28 DG |
2375 | ksess = session->kernel_session; |
2376 | ||
2377 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2378 | if (kchan == NULL) { |
2379 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2380 | goto error; | |
d65106b1 DG |
2381 | } |
2382 | ||
b0a40d28 | 2383 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2384 | if (ret != LTTCOMM_OK) { |
2385 | goto error; | |
2386 | } | |
2387 | ||
2388 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2389 | break; |
2bdd86d4 MD |
2390 | } |
2391 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2392 | { |
b0a40d28 | 2393 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2394 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2395 | |
2396 | usess = session->ust_session; | |
2397 | ||
2398 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2399 | channel_name); | |
2400 | if (uchan == NULL) { | |
2401 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2402 | goto error; | |
2403 | } | |
2404 | ||
7f79d3a1 DG |
2405 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2406 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2407 | goto error; |
2408 | } | |
2409 | ||
7f79d3a1 | 2410 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2411 | channel_name); |
b0a40d28 DG |
2412 | break; |
2413 | } | |
2bdd86d4 MD |
2414 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2415 | case LTTNG_DOMAIN_UST_PID: | |
2416 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2417 | default: |
54d01ffb DG |
2418 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2419 | goto error; | |
d65106b1 | 2420 | } |
26cc6b4e | 2421 | |
54d01ffb DG |
2422 | ret = LTTCOMM_OK; |
2423 | ||
2424 | error: | |
2425 | return ret; | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2430 | */ | |
2431 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2432 | char *channel_name) | |
2433 | { | |
2434 | int ret; | |
54d01ffb DG |
2435 | |
2436 | switch (domain) { | |
2437 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2438 | { |
2439 | struct ltt_kernel_session *ksess; | |
2440 | struct ltt_kernel_channel *kchan; | |
2441 | ||
2442 | ksess = session->kernel_session; | |
2443 | ||
2444 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2445 | if (kchan == NULL) { |
2446 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2447 | goto error; | |
26cc6b4e DG |
2448 | } |
2449 | ||
9730260e | 2450 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2451 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2452 | goto error; |
26cc6b4e DG |
2453 | } |
2454 | ||
54d01ffb | 2455 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2456 | break; |
9730260e DG |
2457 | } |
2458 | case LTTNG_DOMAIN_UST: | |
2459 | { | |
2460 | struct ltt_ust_session *usess; | |
2461 | struct ltt_ust_channel *uchan; | |
2462 | ||
2463 | usess = session->ust_session; | |
2464 | ||
2465 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2466 | channel_name); | |
2467 | if (uchan == NULL) { | |
2468 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2469 | goto error; | |
2470 | } | |
2471 | ||
7f79d3a1 DG |
2472 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2473 | if (ret != 0) { | |
9730260e DG |
2474 | goto error; |
2475 | } | |
2476 | ||
7f79d3a1 | 2477 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2478 | |
2479 | break; | |
2480 | } | |
2481 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2482 | case LTTNG_DOMAIN_UST_PID: | |
2483 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2484 | default: |
54d01ffb DG |
2485 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2486 | goto error; | |
26cc6b4e | 2487 | } |
e953ef25 | 2488 | |
54d01ffb | 2489 | ret = LTTCOMM_OK; |
e953ef25 | 2490 | |
54d01ffb DG |
2491 | error: |
2492 | return ret; | |
2493 | } | |
f5177a38 | 2494 | |
54d01ffb DG |
2495 | /* |
2496 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2497 | */ | |
2498 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2499 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2500 | { | |
2501 | int ret; | |
f5177a38 | 2502 | |
54d01ffb DG |
2503 | switch (domain) { |
2504 | case LTTNG_DOMAIN_KERNEL: | |
2505 | /* Add kernel context to kernel tracer */ | |
2506 | ret = context_kernel_add(session->kernel_session, ctx, | |
2507 | event_name, channel_name); | |
2508 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2509 | goto error; |
e953ef25 | 2510 | } |
2bdd86d4 MD |
2511 | break; |
2512 | case LTTNG_DOMAIN_UST: | |
2513 | { | |
55cc08a6 | 2514 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2515 | |
55cc08a6 DG |
2516 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2517 | if (ret != LTTCOMM_OK) { | |
2518 | goto error; | |
2bdd86d4 | 2519 | } |
e953ef25 | 2520 | break; |
2bdd86d4 | 2521 | } |
55cc08a6 DG |
2522 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2523 | case LTTNG_DOMAIN_UST_PID: | |
2524 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2525 | default: |
54d01ffb DG |
2526 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2527 | goto error; | |
e953ef25 | 2528 | } |
950131af | 2529 | |
54d01ffb | 2530 | ret = LTTCOMM_OK; |
950131af | 2531 | |
54d01ffb DG |
2532 | error: |
2533 | return ret; | |
2534 | } | |
2535 | ||
2536 | /* | |
2537 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2538 | * |
2539 | * TODO: currently, both events and loglevels are kept within the same | |
2540 | * namespace for UST global registry/app registery, so if an event | |
2541 | * happen to have the same name as the loglevel (very unlikely though), | |
2542 | * and an attempt is made to enable/disable both in the same session, | |
2543 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2544 | */ |
2545 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2546 | char *channel_name, struct lttng_event *event) | |
2547 | { | |
2548 | int ret; | |
f6cd6b0f | 2549 | struct lttng_channel *attr; |
48842b30 | 2550 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2551 | |
2552 | switch (domain) { | |
2553 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2554 | { |
2555 | struct ltt_kernel_channel *kchan; | |
2556 | ||
54d01ffb DG |
2557 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2558 | session->kernel_session); | |
2559 | if (kchan == NULL) { | |
f6cd6b0f DG |
2560 | attr = channel_new_default_attr(domain); |
2561 | if (attr == NULL) { | |
2562 | ret = LTTCOMM_FATAL; | |
2563 | goto error; | |
2564 | } | |
2565 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2566 | ||
54d01ffb | 2567 | /* This call will notify the kernel thread */ |
44d3bd01 | 2568 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2569 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2570 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2571 | free(attr); |
f5177a38 DG |
2572 | goto error; |
2573 | } | |
ff4d74e6 | 2574 | free(attr); |
54d01ffb | 2575 | } |
950131af | 2576 | |
54d01ffb DG |
2577 | /* Get the newly created kernel channel pointer */ |
2578 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2579 | session->kernel_session); | |
2580 | if (kchan == NULL) { | |
2581 | /* This sould not happen... */ | |
2582 | ret = LTTCOMM_FATAL; | |
2583 | goto error; | |
2584 | } | |
f5177a38 | 2585 | |
48842b30 DG |
2586 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2587 | event); | |
54d01ffb | 2588 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2589 | goto error; |
950131af DG |
2590 | } |
2591 | ||
54d01ffb | 2592 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2593 | break; |
2bdd86d4 MD |
2594 | } |
2595 | case LTTNG_DOMAIN_UST: | |
2596 | { | |
aea829b3 | 2597 | struct lttng_channel *attr; |
edb67388 | 2598 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2599 | |
edb67388 | 2600 | /* Get channel from global UST domain */ |
48842b30 DG |
2601 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2602 | channel_name); | |
2603 | if (uchan == NULL) { | |
aea829b3 DG |
2604 | /* Create default channel */ |
2605 | attr = channel_new_default_attr(domain); | |
2606 | if (attr == NULL) { | |
2607 | ret = LTTCOMM_FATAL; | |
2608 | goto error; | |
2609 | } | |
596219f7 | 2610 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2611 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2612 | |
7885e399 | 2613 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2614 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2615 | free(attr); |
aea829b3 DG |
2616 | goto error; |
2617 | } | |
aea829b3 DG |
2618 | free(attr); |
2619 | ||
2620 | /* Get the newly created channel reference back */ | |
2621 | uchan = trace_ust_find_channel_by_name( | |
2622 | usess->domain_global.channels, channel_name); | |
2623 | if (uchan == NULL) { | |
2624 | /* Something is really wrong */ | |
2625 | ret = LTTCOMM_FATAL; | |
2626 | goto error; | |
2627 | } | |
48842b30 | 2628 | } |
2bdd86d4 | 2629 | |
edb67388 | 2630 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2631 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2632 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2633 | goto error; |
2bdd86d4 MD |
2634 | } |
2635 | break; | |
2636 | } | |
2637 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2638 | case LTTNG_DOMAIN_UST_PID: | |
2639 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2640 | default: |
54d01ffb DG |
2641 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2642 | goto error; | |
950131af | 2643 | } |
d36b8583 | 2644 | |
54d01ffb | 2645 | ret = LTTCOMM_OK; |
d36b8583 | 2646 | |
54d01ffb DG |
2647 | error: |
2648 | return ret; | |
2649 | } | |
7d29a247 | 2650 | |
54d01ffb DG |
2651 | /* |
2652 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2653 | */ | |
2654 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2655 | char *channel_name, int event_type) |
54d01ffb DG |
2656 | { |
2657 | int ret; | |
2658 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2659 | |
54d01ffb DG |
2660 | switch (domain) { |
2661 | case LTTNG_DOMAIN_KERNEL: | |
2662 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2663 | session->kernel_session); | |
2664 | if (kchan == NULL) { | |
2665 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2666 | ret = channel_kernel_create(session->kernel_session, NULL, |
2667 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2668 | if (ret != LTTCOMM_OK) { |
2669 | goto error; | |
d36b8583 | 2670 | } |
0d0c377a | 2671 | |
8f69e5eb DG |
2672 | /* Get the newly created kernel channel pointer */ |
2673 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2674 | session->kernel_session); | |
2675 | if (kchan == NULL) { | |
2676 | /* This sould not happen... */ | |
2677 | ret = LTTCOMM_FATAL; | |
2678 | goto error; | |
2679 | } | |
2680 | ||
54d01ffb | 2681 | } |
0fdd1e2c | 2682 | |
7a3d1328 | 2683 | switch (event_type) { |
76d45b40 | 2684 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2685 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2686 | kchan, kernel_tracer_fd); |
7a3d1328 | 2687 | break; |
76d45b40 | 2688 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2689 | /* |
7a3d1328 MD |
2690 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2691 | * events already registered to the channel. | |
8c9ae521 | 2692 | */ |
7a3d1328 MD |
2693 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2694 | kchan, kernel_tracer_fd); | |
2695 | break; | |
76d45b40 | 2696 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2697 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2698 | ret = event_kernel_enable_all(session->kernel_session, |
2699 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2700 | break; |
2701 | default: | |
2702 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2703 | goto error; | |
8c9ae521 | 2704 | } |
8f69e5eb DG |
2705 | |
2706 | /* Manage return value */ | |
54d01ffb | 2707 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2708 | goto error; |
d36b8583 DG |
2709 | } |
2710 | ||
54d01ffb | 2711 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2712 | break; |
76d45b40 DG |
2713 | case LTTNG_DOMAIN_UST: |
2714 | { | |
2715 | struct lttng_channel *attr; | |
2716 | struct ltt_ust_channel *uchan; | |
2717 | struct ltt_ust_session *usess = session->ust_session; | |
2718 | ||
2719 | /* Get channel from global UST domain */ | |
2720 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2721 | channel_name); | |
2722 | if (uchan == NULL) { | |
2723 | /* Create default channel */ | |
2724 | attr = channel_new_default_attr(domain); | |
2725 | if (attr == NULL) { | |
2726 | ret = LTTCOMM_FATAL; | |
2727 | goto error; | |
2728 | } | |
2729 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2730 | attr->name[NAME_MAX - 1] = '\0'; | |
2731 | ||
2732 | /* Use the internal command enable channel */ | |
7885e399 | 2733 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2734 | if (ret != LTTCOMM_OK) { |
2735 | free(attr); | |
2736 | goto error; | |
2737 | } | |
2738 | free(attr); | |
2739 | ||
2740 | /* Get the newly created channel reference back */ | |
2741 | uchan = trace_ust_find_channel_by_name( | |
2742 | usess->domain_global.channels, channel_name); | |
2743 | if (uchan == NULL) { | |
2744 | /* Something is really wrong */ | |
2745 | ret = LTTCOMM_FATAL; | |
2746 | goto error; | |
2747 | } | |
2748 | } | |
2749 | ||
2750 | /* At this point, the session and channel exist on the tracer */ | |
2751 | ||
2752 | switch (event_type) { | |
2753 | case LTTNG_EVENT_ALL: | |
2754 | case LTTNG_EVENT_TRACEPOINT: | |
2755 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2756 | if (ret != LTTCOMM_OK) { | |
2757 | goto error; | |
2758 | } | |
2759 | break; | |
2760 | default: | |
2761 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2762 | goto error; | |
2763 | } | |
2764 | ||
2765 | /* Manage return value */ | |
2766 | if (ret != LTTCOMM_OK) { | |
2767 | goto error; | |
2768 | } | |
2769 | ||
2770 | break; | |
2771 | } | |
2772 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2773 | case LTTNG_DOMAIN_UST_PID: | |
2774 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2775 | default: |
54d01ffb DG |
2776 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2777 | goto error; | |
d36b8583 | 2778 | } |
f3ed775e | 2779 | |
54d01ffb DG |
2780 | ret = LTTCOMM_OK; |
2781 | ||
2782 | error: | |
2783 | return ret; | |
2784 | } | |
2785 | ||
2786 | /* | |
2787 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2788 | */ | |
2789 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2790 | { | |
2791 | int ret; | |
2792 | ssize_t nb_events = 0; | |
2793 | ||
2794 | switch (domain) { | |
2795 | case LTTNG_DOMAIN_KERNEL: | |
2796 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2797 | if (nb_events < 0) { | |
2798 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2799 | goto error; | |
894be886 | 2800 | } |
54d01ffb | 2801 | break; |
b551a063 DG |
2802 | case LTTNG_DOMAIN_UST: |
2803 | nb_events = ust_app_list_events(events); | |
2804 | if (nb_events < 0) { | |
2805 | ret = LTTCOMM_UST_LIST_FAIL; | |
2806 | goto error; | |
2807 | } | |
2808 | break; | |
54d01ffb | 2809 | default: |
54d01ffb DG |
2810 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2811 | goto error; | |
2812 | } | |
894be886 | 2813 | |
54d01ffb | 2814 | return nb_events; |
7d29a247 | 2815 | |
54d01ffb DG |
2816 | error: |
2817 | /* Return negative value to differentiate return code */ | |
2818 | return -ret; | |
2819 | } | |
b389abbe | 2820 | |
54d01ffb DG |
2821 | /* |
2822 | * Command LTTNG_START_TRACE processed by the client thread. | |
2823 | */ | |
2824 | static int cmd_start_trace(struct ltt_session *session) | |
2825 | { | |
2826 | int ret; | |
54d01ffb | 2827 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2828 | struct ltt_ust_session *usess; |
b389abbe | 2829 | |
54d01ffb DG |
2830 | /* Short cut */ |
2831 | ksession = session->kernel_session; | |
b9d9b220 | 2832 | usess = session->ust_session; |
5eb91c98 | 2833 | |
b9ef1c83 DG |
2834 | if (session->enabled) { |
2835 | ret = LTTCOMM_UST_START_FAIL; | |
2836 | goto error; | |
2837 | } | |
2838 | ||
464dd62d MD |
2839 | session->enabled = 1; |
2840 | ||
54d01ffb DG |
2841 | /* Kernel tracing */ |
2842 | if (ksession != NULL) { | |
2bdd86d4 MD |
2843 | struct ltt_kernel_channel *kchan; |
2844 | ||
54d01ffb DG |
2845 | /* Open kernel metadata */ |
2846 | if (ksession->metadata == NULL) { | |
2847 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2848 | if (ret < 0) { | |
2849 | ret = LTTCOMM_KERN_META_FAIL; | |
2850 | goto error; | |
b389abbe | 2851 | } |
54d01ffb | 2852 | } |
7d29a247 | 2853 | |
54d01ffb DG |
2854 | /* Open kernel metadata stream */ |
2855 | if (ksession->metadata_stream_fd == 0) { | |
2856 | ret = kernel_open_metadata_stream(ksession); | |
2857 | if (ret < 0) { | |
2858 | ERR("Kernel create metadata stream failed"); | |
2859 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2860 | goto error; | |
2861 | } | |
2862 | } | |
2863 | ||
2864 | /* For each channel */ | |
2865 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2866 | if (kchan->stream_count == 0) { | |
2867 | ret = kernel_open_channel_stream(kchan); | |
2868 | if (ret < 0) { | |
2869 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2870 | goto error; |
2871 | } | |
54d01ffb DG |
2872 | /* Update the stream global counter */ |
2873 | ksession->stream_count_global += ret; | |
7d29a247 | 2874 | } |
54d01ffb DG |
2875 | } |
2876 | ||
2877 | /* Setup kernel consumer socket and send fds to it */ | |
2878 | ret = init_kernel_tracing(ksession); | |
2879 | if (ret < 0) { | |
2880 | ret = LTTCOMM_KERN_START_FAIL; | |
2881 | goto error; | |
2882 | } | |
2883 | ||
2884 | /* This start the kernel tracing */ | |
2885 | ret = kernel_start_session(ksession); | |
2886 | if (ret < 0) { | |
2887 | ret = LTTCOMM_KERN_START_FAIL; | |
2888 | goto error; | |
2889 | } | |
2890 | ||
2891 | /* Quiescent wait after starting trace */ | |
2892 | kernel_wait_quiescent(kernel_tracer_fd); | |
2893 | } | |
2894 | ||
36dc12cc | 2895 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2896 | if (usess) { |
2897 | usess->start_trace = 1; | |
36dc12cc | 2898 | |
b9d9b220 DG |
2899 | ret = ust_app_start_trace_all(usess); |
2900 | if (ret < 0) { | |
2901 | ret = LTTCOMM_UST_START_FAIL; | |
2902 | goto error; | |
2903 | } | |
2bdd86d4 | 2904 | } |
54d01ffb DG |
2905 | |
2906 | ret = LTTCOMM_OK; | |
2907 | ||
2908 | error: | |
2909 | return ret; | |
2910 | } | |
2911 | ||
2912 | /* | |
2913 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2914 | */ | |
2915 | static int cmd_stop_trace(struct ltt_session *session) | |
2916 | { | |
2917 | int ret; | |
2918 | struct ltt_kernel_channel *kchan; | |
2919 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2920 | struct ltt_ust_session *usess; |
54d01ffb DG |
2921 | |
2922 | /* Short cut */ | |
2923 | ksession = session->kernel_session; | |
8be98f9a | 2924 | usess = session->ust_session; |
54d01ffb | 2925 | |
b9ef1c83 | 2926 | if (!session->enabled) { |
190df5ac | 2927 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2928 | goto error; |
2929 | } | |
2930 | ||
464dd62d MD |
2931 | session->enabled = 0; |
2932 | ||
54d01ffb DG |
2933 | /* Kernel tracer */ |
2934 | if (ksession != NULL) { | |
2935 | DBG("Stop kernel tracing"); | |
2936 | ||
2937 | /* Flush all buffers before stopping */ | |
2938 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2939 | if (ret < 0) { | |
2940 | ERR("Kernel metadata flush failed"); | |
2941 | } | |
f34daff7 | 2942 | |
54d01ffb DG |
2943 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2944 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2945 | if (ret < 0) { |
54d01ffb | 2946 | ERR("Kernel flush buffer error"); |
7d29a247 | 2947 | } |
54d01ffb | 2948 | } |
19e70852 | 2949 | |
54d01ffb DG |
2950 | ret = kernel_stop_session(ksession); |
2951 | if (ret < 0) { | |
2952 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2953 | goto error; |
f3ed775e | 2954 | } |
54d01ffb DG |
2955 | |
2956 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2957 | } |
54d01ffb | 2958 | |
8be98f9a MD |
2959 | if (usess) { |
2960 | usess->start_trace = 0; | |
2bdd86d4 | 2961 | |
8be98f9a | 2962 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2963 | if (ret < 0) { |
190df5ac | 2964 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2965 | goto error; |
2966 | } | |
2bdd86d4 | 2967 | } |
54d01ffb DG |
2968 | |
2969 | ret = LTTCOMM_OK; | |
2970 | ||
2971 | error: | |
2972 | return ret; | |
2973 | } | |
2974 | ||
2975 | /* | |
2976 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2977 | */ | |
6df2e2c9 | 2978 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
2979 | { |
2980 | int ret; | |
2981 | ||
6df2e2c9 | 2982 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
2983 | if (ret != LTTCOMM_OK) { |
2984 | goto error; | |
2985 | } | |
2986 | ||
2987 | ret = LTTCOMM_OK; | |
2988 | ||
2989 | error: | |
2990 | return ret; | |
2991 | } | |
2992 | ||
2993 | /* | |
2994 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2995 | */ | |
2996 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2997 | { | |
2998 | int ret; | |
2999 | ||
3000 | /* Clean kernel session teardown */ | |
3001 | teardown_kernel_session(session); | |
84cd17c6 MD |
3002 | /* UST session teardown */ |
3003 | teardown_ust_session(session); | |
54d01ffb DG |
3004 | |
3005 | /* | |
3006 | * Must notify the kernel thread here to update it's poll setin order | |
3007 | * to remove the channel(s)' fd just destroyed. | |
3008 | */ | |
3009 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3010 | if (ret < 0) { | |
3011 | perror("write kernel poll pipe"); | |
3012 | } | |
3013 | ||
271933a4 | 3014 | ret = session_destroy(session); |
54d01ffb DG |
3015 | |
3016 | return ret; | |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3021 | */ | |
3022 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3023 | { | |
3024 | int ret; | |
3025 | ||
3026 | switch (domain) { | |
3027 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3028 | { |
54d01ffb | 3029 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3030 | |
54d01ffb DG |
3031 | kcalibrate.type = calibrate->type; |
3032 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3033 | if (ret < 0) { |
54d01ffb DG |
3034 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3035 | goto error; | |
33a2b854 | 3036 | } |
54d01ffb DG |
3037 | break; |
3038 | } | |
3039 | default: | |
3040 | /* TODO: Userspace tracing */ | |
3041 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3042 | goto error; | |
3043 | } | |
33a2b854 | 3044 | |
54d01ffb | 3045 | ret = LTTCOMM_OK; |
33a2b854 | 3046 | |
54d01ffb DG |
3047 | error: |
3048 | return ret; | |
3049 | } | |
7d29a247 | 3050 | |
54d01ffb DG |
3051 | /* |
3052 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3053 | */ | |
3054 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3055 | char *sock_path) | |
3056 | { | |
3057 | int ret, sock; | |
b389abbe | 3058 | |
54d01ffb DG |
3059 | switch (domain) { |
3060 | case LTTNG_DOMAIN_KERNEL: | |
3061 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3062 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3063 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3064 | goto error; | |
3065 | } | |
3066 | ||
3067 | sock = lttcomm_connect_unix_sock(sock_path); | |
3068 | if (sock < 0) { | |
3069 | ret = LTTCOMM_CONNECT_FAIL; | |
3070 | goto error; | |
3071 | } | |
3072 | ||
3073 | session->kernel_session->consumer_fd = sock; | |
3074 | break; | |
3075 | default: | |
3076 | /* TODO: Userspace tracing */ | |
3077 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3078 | goto error; | |
3079 | } | |
3080 | ||
3081 | ret = LTTCOMM_OK; | |
3082 | ||
3083 | error: | |
3084 | return ret; | |
3085 | } | |
3086 | ||
3087 | /* | |
3088 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3089 | */ | |
3090 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3091 | struct lttng_domain **domains) | |
3092 | { | |
b551a063 | 3093 | int ret, index = 0; |
54d01ffb DG |
3094 | ssize_t nb_dom = 0; |
3095 | ||
3096 | if (session->kernel_session != NULL) { | |
b551a063 | 3097 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3098 | nb_dom++; |
3099 | } | |
3100 | ||
b551a063 DG |
3101 | if (session->ust_session != NULL) { |
3102 | DBG3("Listing domains found UST global domain"); | |
3103 | nb_dom++; | |
3104 | } | |
54d01ffb | 3105 | |
b551a063 | 3106 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3107 | if (*domains == NULL) { |
3108 | ret = -LTTCOMM_FATAL; | |
3109 | goto error; | |
3110 | } | |
3111 | ||
b551a063 DG |
3112 | if (session->kernel_session != NULL) { |
3113 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3114 | index++; | |
3115 | } | |
3116 | ||
3117 | if (session->ust_session != NULL) { | |
3118 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3119 | index++; | |
3120 | } | |
54d01ffb | 3121 | |
54d01ffb DG |
3122 | return nb_dom; |
3123 | ||
3124 | error: | |
3125 | return ret; | |
3126 | } | |
3127 | ||
3128 | /* | |
3129 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3130 | */ | |
b551a063 | 3131 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3132 | struct lttng_channel **channels) |
3133 | { | |
3134 | int ret; | |
3135 | ssize_t nb_chan = 0; | |
3136 | ||
b551a063 DG |
3137 | switch (domain) { |
3138 | case LTTNG_DOMAIN_KERNEL: | |
3139 | if (session->kernel_session != NULL) { | |
3140 | nb_chan = session->kernel_session->channel_count; | |
3141 | } | |
0df502fd | 3142 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3143 | break; |
3144 | case LTTNG_DOMAIN_UST: | |
3145 | if (session->ust_session != NULL) { | |
bec39940 | 3146 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3147 | session->ust_session->domain_global.channels); |
3148 | } | |
0df502fd | 3149 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3150 | break; |
3151 | default: | |
3152 | *channels = NULL; | |
3153 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3154 | goto error; |
3155 | } | |
3156 | ||
b551a063 DG |
3157 | if (nb_chan > 0) { |
3158 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3159 | if (*channels == NULL) { | |
3160 | ret = -LTTCOMM_FATAL; | |
3161 | goto error; | |
3162 | } | |
54d01ffb | 3163 | |
b551a063 DG |
3164 | list_lttng_channels(domain, session, *channels); |
3165 | } else { | |
3166 | *channels = NULL; | |
3167 | } | |
2bdd86d4 | 3168 | |
54d01ffb DG |
3169 | return nb_chan; |
3170 | ||
3171 | error: | |
3172 | return ret; | |
3173 | } | |
3174 | ||
3175 | /* | |
3176 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3177 | */ | |
b551a063 | 3178 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3179 | char *channel_name, struct lttng_event **events) |
3180 | { | |
b551a063 | 3181 | int ret = 0; |
54d01ffb | 3182 | ssize_t nb_event = 0; |
54d01ffb | 3183 | |
b551a063 DG |
3184 | switch (domain) { |
3185 | case LTTNG_DOMAIN_KERNEL: | |
3186 | if (session->kernel_session != NULL) { | |
3187 | nb_event = list_lttng_kernel_events(channel_name, | |
3188 | session->kernel_session, events); | |
54d01ffb | 3189 | } |
b551a063 DG |
3190 | break; |
3191 | case LTTNG_DOMAIN_UST: | |
3192 | { | |
3193 | if (session->ust_session != NULL) { | |
3194 | nb_event = list_lttng_ust_global_events(channel_name, | |
3195 | &session->ust_session->domain_global, events); | |
3196 | } | |
3197 | break; | |
54d01ffb | 3198 | } |
b551a063 DG |
3199 | default: |
3200 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3201 | goto error; |
3202 | } | |
3203 | ||
b551a063 | 3204 | ret = nb_event; |
54d01ffb DG |
3205 | |
3206 | error: | |
3207 | return ret; | |
3208 | } | |
3209 | ||
3210 | /* | |
3211 | * Process the command requested by the lttng client within the command | |
3212 | * context structure. This function make sure that the return structure (llm) | |
3213 | * is set and ready for transmission before returning. | |
3214 | * | |
3215 | * Return any error encountered or 0 for success. | |
3216 | */ | |
3217 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3218 | { | |
3219 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3220 | int need_tracing_session = 1; |
54d01ffb DG |
3221 | |
3222 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3223 | ||
4fba7219 DG |
3224 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3225 | ret = LTTCOMM_KERN_NA; | |
3226 | goto error; | |
3227 | } | |
3228 | ||
54d01ffb DG |
3229 | /* |
3230 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3231 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3232 | * command. |
3233 | */ | |
3234 | switch(cmd_ctx->lsm->cmd_type) { | |
3235 | case LTTNG_LIST_SESSIONS: | |
3236 | case LTTNG_LIST_TRACEPOINTS: | |
3237 | case LTTNG_LIST_DOMAINS: | |
3238 | case LTTNG_LIST_CHANNELS: | |
3239 | case LTTNG_LIST_EVENTS: | |
3240 | break; | |
3241 | default: | |
3242 | /* Setup lttng message with no payload */ | |
3243 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3244 | if (ret < 0) { | |
3245 | /* This label does not try to unlock the session */ | |
3246 | goto init_setup_error; | |
3247 | } | |
3248 | } | |
3249 | ||
3250 | /* Commands that DO NOT need a session. */ | |
3251 | switch (cmd_ctx->lsm->cmd_type) { | |
3252 | case LTTNG_CALIBRATE: | |
3253 | case LTTNG_CREATE_SESSION: | |
3254 | case LTTNG_LIST_SESSIONS: | |
3255 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3256 | need_tracing_session = 0; |
54d01ffb DG |
3257 | break; |
3258 | default: | |
3259 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3260 | session_lock_list(); |
54d01ffb | 3261 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3262 | session_unlock_list(); |
54d01ffb DG |
3263 | if (cmd_ctx->session == NULL) { |
3264 | if (cmd_ctx->lsm->session.name != NULL) { | |
3265 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3266 | } else { | |
3267 | /* If no session name specified */ | |
3268 | ret = LTTCOMM_SELECT_SESS; | |
3269 | } | |
3270 | goto error; | |
3271 | } else { | |
3272 | /* Acquire lock for the session */ | |
3273 | session_lock(cmd_ctx->session); | |
3274 | } | |
3275 | break; | |
3276 | } | |
b389abbe | 3277 | |
54d01ffb DG |
3278 | /* |
3279 | * Check domain type for specific "pre-action". | |
3280 | */ | |
3281 | switch (cmd_ctx->lsm->domain.type) { | |
3282 | case LTTNG_DOMAIN_KERNEL: | |
3283 | /* Kernel tracer check */ | |
3284 | if (kernel_tracer_fd == 0) { | |
3285 | /* Basically, load kernel tracer modules */ | |
3286 | init_kernel_tracer(); | |
3287 | if (kernel_tracer_fd == 0) { | |
3288 | ret = LTTCOMM_KERN_NA; | |
3289 | goto error; | |
3290 | } | |
3291 | } | |
5eb91c98 | 3292 | |
54d01ffb | 3293 | /* Need a session for kernel command */ |
44d3bd01 | 3294 | if (need_tracing_session) { |
54d01ffb | 3295 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3296 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3297 | if (ret < 0) { |
54d01ffb | 3298 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3299 | goto error; |
3300 | } | |
b389abbe | 3301 | } |
7d29a247 | 3302 | |
54d01ffb | 3303 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3304 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3305 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3306 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3307 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3308 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3309 | if (ret < 0) { |
54d01ffb DG |
3310 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3311 | goto error; | |
950131af | 3312 | } |
3ff2ecac MD |
3313 | } else { |
3314 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3315 | } |
0d0c377a | 3316 | } |
54d01ffb | 3317 | break; |
2bdd86d4 | 3318 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3319 | { |
44d3bd01 | 3320 | if (need_tracing_session) { |
f6a9efaa | 3321 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3322 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3323 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3324 | if (ret != LTTCOMM_OK) { |
3325 | goto error; | |
3326 | } | |
3327 | } | |
7753dea8 MD |
3328 | /* Start the UST consumer daemons */ |
3329 | /* 64-bit */ | |
3330 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3331 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3332 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3333 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3334 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3335 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3336 | if (ret < 0) { |
7753dea8 MD |
3337 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3338 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3339 | goto error; |
3340 | } | |
48842b30 | 3341 | |
7753dea8 | 3342 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3343 | } else { |
7753dea8 MD |
3344 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3345 | } | |
3346 | /* 32-bit */ | |
fc7a59ce | 3347 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3348 | ustconsumer32_data.pid == 0 && |
3349 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3350 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3351 | ret = start_consumerd(&ustconsumer32_data); | |
3352 | if (ret < 0) { | |
3353 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3354 | ust_consumerd32_fd = -EINVAL; | |
3355 | goto error; | |
3356 | } | |
3357 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3358 | } else { | |
3359 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3360 | } |
44d3bd01 DG |
3361 | } |
3362 | break; | |
48842b30 | 3363 | } |
54d01ffb | 3364 | default: |
54d01ffb DG |
3365 | break; |
3366 | } | |
33a2b854 | 3367 | |
8e0af1b4 MD |
3368 | /* |
3369 | * Check that the UID or GID match that of the tracing session. | |
3370 | * The root user can interact with all sessions. | |
3371 | */ | |
3372 | if (need_tracing_session) { | |
3373 | if (!session_access_ok(cmd_ctx->session, | |
3374 | cmd_ctx->creds.uid, cmd_ctx->creds.gid)) { | |
3375 | ret = LTTCOMM_EPERM; | |
3376 | goto error; | |
3377 | } | |
3378 | } | |
3379 | ||
54d01ffb DG |
3380 | /* Process by command type */ |
3381 | switch (cmd_ctx->lsm->cmd_type) { | |
3382 | case LTTNG_ADD_CONTEXT: | |
3383 | { | |
3384 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3385 | cmd_ctx->lsm->u.context.channel_name, | |
3386 | cmd_ctx->lsm->u.context.event_name, | |
3387 | &cmd_ctx->lsm->u.context.ctx); | |
3388 | break; | |
3389 | } | |
3390 | case LTTNG_DISABLE_CHANNEL: | |
3391 | { | |
3392 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3393 | cmd_ctx->lsm->u.disable.channel_name); | |
3394 | break; | |
3395 | } | |
3396 | case LTTNG_DISABLE_EVENT: | |
3397 | { | |
3398 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3399 | cmd_ctx->lsm->u.disable.channel_name, | |
3400 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3401 | ret = LTTCOMM_OK; |
3402 | break; | |
3403 | } | |
54d01ffb DG |
3404 | case LTTNG_DISABLE_ALL_EVENT: |
3405 | { | |
2bdd86d4 | 3406 | DBG("Disabling all events"); |
54d01ffb DG |
3407 | |
3408 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3409 | cmd_ctx->lsm->u.disable.channel_name); | |
3410 | break; | |
3411 | } | |
3412 | case LTTNG_ENABLE_CHANNEL: | |
3413 | { | |
aea829b3 | 3414 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3415 | &cmd_ctx->lsm->u.channel.chan); |
3416 | break; | |
3417 | } | |
3418 | case LTTNG_ENABLE_EVENT: | |
3419 | { | |
3420 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3421 | cmd_ctx->lsm->u.enable.channel_name, | |
3422 | &cmd_ctx->lsm->u.enable.event); | |
3423 | break; | |
3424 | } | |
3425 | case LTTNG_ENABLE_ALL_EVENT: | |
3426 | { | |
2bdd86d4 | 3427 | DBG("Enabling all events"); |
54d01ffb DG |
3428 | |
3429 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3430 | cmd_ctx->lsm->u.enable.channel_name, |
3431 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3432 | break; |
3433 | } | |
052da939 | 3434 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3435 | { |
9f19cc17 | 3436 | struct lttng_event *events; |
54d01ffb | 3437 | ssize_t nb_events; |
052da939 | 3438 | |
54d01ffb DG |
3439 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3440 | if (nb_events < 0) { | |
3441 | ret = -nb_events; | |
3442 | goto error; | |
2ef84c95 DG |
3443 | } |
3444 | ||
3445 | /* | |
3446 | * Setup lttng message with payload size set to the event list size in | |
3447 | * bytes and then copy list into the llm payload. | |
3448 | */ | |
052da939 | 3449 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3450 | if (ret < 0) { |
052da939 | 3451 | free(events); |
2ef84c95 DG |
3452 | goto setup_error; |
3453 | } | |
3454 | ||
3455 | /* Copy event list into message payload */ | |
9f19cc17 | 3456 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3457 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3458 | |
9f19cc17 | 3459 | free(events); |
2ef84c95 DG |
3460 | |
3461 | ret = LTTCOMM_OK; | |
3462 | break; | |
3463 | } | |
f3ed775e | 3464 | case LTTNG_START_TRACE: |
8c0faa1d | 3465 | { |
54d01ffb | 3466 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3467 | break; |
3468 | } | |
f3ed775e | 3469 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3470 | { |
54d01ffb | 3471 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3472 | break; |
3473 | } | |
5e16da05 MD |
3474 | case LTTNG_CREATE_SESSION: |
3475 | { | |
54d01ffb | 3476 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3477 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3478 | break; |
3479 | } | |
3480 | case LTTNG_DESTROY_SESSION: | |
3481 | { | |
54d01ffb DG |
3482 | ret = cmd_destroy_session(cmd_ctx->session, |
3483 | cmd_ctx->lsm->session.name); | |
5461b305 | 3484 | break; |
5e16da05 | 3485 | } |
9f19cc17 | 3486 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3487 | { |
54d01ffb DG |
3488 | ssize_t nb_dom; |
3489 | struct lttng_domain *domains; | |
5461b305 | 3490 | |
54d01ffb DG |
3491 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3492 | if (nb_dom < 0) { | |
3493 | ret = -nb_dom; | |
3494 | goto error; | |
ce3d728c | 3495 | } |
520ff687 | 3496 | |
54d01ffb | 3497 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3498 | if (ret < 0) { |
3499 | goto setup_error; | |
520ff687 | 3500 | } |
57167058 | 3501 | |
54d01ffb DG |
3502 | /* Copy event list into message payload */ |
3503 | memcpy(cmd_ctx->llm->payload, domains, | |
3504 | nb_dom * sizeof(struct lttng_domain)); | |
3505 | ||
3506 | free(domains); | |
5e16da05 | 3507 | |
5461b305 | 3508 | ret = LTTCOMM_OK; |
5e16da05 MD |
3509 | break; |
3510 | } | |
9f19cc17 | 3511 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3512 | { |
54d01ffb DG |
3513 | size_t nb_chan; |
3514 | struct lttng_channel *channels; | |
3515 | ||
b551a063 DG |
3516 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3517 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3518 | if (nb_chan < 0) { |
3519 | ret = -nb_chan; | |
3520 | goto error; | |
5461b305 | 3521 | } |
ca95a216 | 3522 | |
54d01ffb | 3523 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3524 | if (ret < 0) { |
3525 | goto setup_error; | |
3526 | } | |
9f19cc17 | 3527 | |
54d01ffb DG |
3528 | /* Copy event list into message payload */ |
3529 | memcpy(cmd_ctx->llm->payload, channels, | |
3530 | nb_chan * sizeof(struct lttng_channel)); | |
3531 | ||
3532 | free(channels); | |
9f19cc17 DG |
3533 | |
3534 | ret = LTTCOMM_OK; | |
5461b305 | 3535 | break; |
5e16da05 | 3536 | } |
9f19cc17 | 3537 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3538 | { |
b551a063 | 3539 | ssize_t nb_event; |
684d34d2 | 3540 | struct lttng_event *events = NULL; |
9f19cc17 | 3541 | |
b551a063 | 3542 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3543 | cmd_ctx->lsm->u.list.channel_name, &events); |
3544 | if (nb_event < 0) { | |
3545 | ret = -nb_event; | |
3546 | goto error; | |
5461b305 | 3547 | } |
ca95a216 | 3548 | |
54d01ffb | 3549 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3550 | if (ret < 0) { |
3551 | goto setup_error; | |
3552 | } | |
9f19cc17 | 3553 | |
54d01ffb DG |
3554 | /* Copy event list into message payload */ |
3555 | memcpy(cmd_ctx->llm->payload, events, | |
3556 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3557 | |
54d01ffb | 3558 | free(events); |
9f19cc17 DG |
3559 | |
3560 | ret = LTTCOMM_OK; | |
5461b305 | 3561 | break; |
5e16da05 MD |
3562 | } |
3563 | case LTTNG_LIST_SESSIONS: | |
3564 | { | |
8e0af1b4 | 3565 | unsigned int nr_sessions; |
5461b305 | 3566 | |
8e0af1b4 MD |
3567 | session_lock_list(); |
3568 | nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
3569 | if (nr_sessions == 0) { | |
f3ed775e | 3570 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3571 | session_unlock_list(); |
5461b305 | 3572 | goto error; |
57167058 | 3573 | } |
8e0af1b4 | 3574 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3575 | if (ret < 0) { |
54d01ffb | 3576 | session_unlock_list(); |
5461b305 | 3577 | goto setup_error; |
e065084a | 3578 | } |
5e16da05 | 3579 | |
6c9cc2ab | 3580 | /* Filled the session array */ |
8e0af1b4 MD |
3581 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
3582 | cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
6c9cc2ab | 3583 | |
54d01ffb | 3584 | session_unlock_list(); |
5e16da05 | 3585 | |
5461b305 | 3586 | ret = LTTCOMM_OK; |
5e16da05 MD |
3587 | break; |
3588 | } | |
d0254c7c MD |
3589 | case LTTNG_CALIBRATE: |
3590 | { | |
54d01ffb DG |
3591 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3592 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3593 | break; |
3594 | } | |
d9800920 DG |
3595 | case LTTNG_REGISTER_CONSUMER: |
3596 | { | |
54d01ffb DG |
3597 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3598 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3599 | break; |
3600 | } | |
5e16da05 | 3601 | default: |
5e16da05 | 3602 | ret = LTTCOMM_UND; |
5461b305 | 3603 | break; |
fac6795d DG |
3604 | } |
3605 | ||
5461b305 | 3606 | error: |
5461b305 DG |
3607 | if (cmd_ctx->llm == NULL) { |
3608 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3609 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3610 | goto setup_error; |
3611 | } | |
3612 | } | |
54d01ffb | 3613 | /* Set return code */ |
5461b305 | 3614 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3615 | setup_error: |
b5541356 | 3616 | if (cmd_ctx->session) { |
54d01ffb | 3617 | session_unlock(cmd_ctx->session); |
b5541356 | 3618 | } |
54d01ffb | 3619 | init_setup_error: |
8028d920 | 3620 | return ret; |
fac6795d DG |
3621 | } |
3622 | ||
1d4b027a | 3623 | /* |
d063d709 DG |
3624 | * This thread manage all clients request using the unix client socket for |
3625 | * communication. | |
1d4b027a DG |
3626 | */ |
3627 | static void *thread_manage_clients(void *data) | |
3628 | { | |
5eb91c98 DG |
3629 | int sock = 0, ret, i, pollfd; |
3630 | uint32_t revents, nb_fd; | |
273ea72c | 3631 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3632 | struct lttng_poll_event events; |
1d4b027a DG |
3633 | |
3634 | DBG("[thread] Manage client started"); | |
3635 | ||
f6a9efaa DG |
3636 | rcu_register_thread(); |
3637 | ||
1d4b027a DG |
3638 | ret = lttcomm_listen_unix_sock(client_sock); |
3639 | if (ret < 0) { | |
3640 | goto error; | |
3641 | } | |
3642 | ||
5eb91c98 DG |
3643 | /* |
3644 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3645 | * more will be added to this poll set. | |
3646 | */ | |
3647 | ret = create_thread_poll_set(&events, 2); | |
3648 | if (ret < 0) { | |
3649 | goto error; | |
3650 | } | |
273ea72c | 3651 | |
5eb91c98 DG |
3652 | /* Add the application registration socket */ |
3653 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3654 | if (ret < 0) { | |
3655 | goto error; | |
3656 | } | |
273ea72c | 3657 | |
bbd973c2 DG |
3658 | /* |
3659 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3660 | */ |
3661 | if (opt_sig_parent) { | |
3662 | kill(ppid, SIGCHLD); | |
3663 | } | |
3664 | ||
3665 | while (1) { | |
1d4b027a | 3666 | DBG("Accepting client command ..."); |
273ea72c | 3667 | |
5eb91c98 DG |
3668 | nb_fd = LTTNG_POLL_GETNB(&events); |
3669 | ||
273ea72c | 3670 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3671 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3672 | if (ret < 0) { |
273ea72c DG |
3673 | goto error; |
3674 | } | |
3675 | ||
5eb91c98 DG |
3676 | for (i = 0; i < nb_fd; i++) { |
3677 | /* Fetch once the poll data */ | |
3678 | revents = LTTNG_POLL_GETEV(&events, i); | |
3679 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3680 | ||
3681 | /* Thread quit pipe has been closed. Killing thread. */ | |
3682 | ret = check_thread_quit_pipe(pollfd, revents); | |
3683 | if (ret) { | |
3684 | goto error; | |
3685 | } | |
3686 | ||
3687 | /* Event on the registration socket */ | |
3688 | if (pollfd == client_sock) { | |
3689 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3690 | ERR("Client socket poll error"); | |
3691 | goto error; | |
3692 | } | |
3693 | } | |
3694 | } | |
3695 | ||
3696 | DBG("Wait for client response"); | |
3697 | ||
3698 | sock = lttcomm_accept_unix_sock(client_sock); | |
3699 | if (sock < 0) { | |
273ea72c | 3700 | goto error; |
273ea72c DG |
3701 | } |
3702 | ||
be040666 DG |
3703 | /* Set socket option for credentials retrieval */ |
3704 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3705 | if (ret < 0) { | |
3706 | goto error; | |
3707 | } | |
3708 | ||
5eb91c98 | 3709 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3710 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3711 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3712 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3713 | goto error; |
5eb91c98 | 3714 | } |
1d4b027a | 3715 | |
5eb91c98 | 3716 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3717 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3718 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3719 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3720 | goto error; |
3721 | } | |
1d4b027a | 3722 | |
5eb91c98 DG |
3723 | cmd_ctx->llm = NULL; |
3724 | cmd_ctx->session = NULL; | |
1d4b027a | 3725 | |
5eb91c98 DG |
3726 | /* |
3727 | * Data is received from the lttng client. The struct | |
3728 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3729 | * the client. | |
3730 | */ | |
3731 | DBG("Receiving data from client ..."); | |
be040666 DG |
3732 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3733 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3734 | if (ret <= 0) { |
3735 | DBG("Nothing recv() from client... continuing"); | |
3736 | close(sock); | |
3737 | free(cmd_ctx); | |
3738 | continue; | |
3739 | } | |
1d4b027a | 3740 | |
5eb91c98 DG |
3741 | // TODO: Validate cmd_ctx including sanity check for |
3742 | // security purpose. | |
f7776ea7 | 3743 | |
f6a9efaa | 3744 | rcu_thread_online(); |
5eb91c98 DG |
3745 | /* |
3746 | * This function dispatch the work to the kernel or userspace tracer | |
3747 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3748 | * informations for the client. The command context struct contains | |
3749 | * everything this function may needs. | |
3750 | */ | |
3751 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3752 | rcu_thread_offline(); |
5eb91c98 | 3753 | if (ret < 0) { |
bbd973c2 | 3754 | /* |
5eb91c98 | 3755 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3756 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3757 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3758 | */ |
bbd973c2 | 3759 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3760 | continue; |
3761 | } | |
d6e4fca4 | 3762 | |
54d01ffb DG |
3763 | DBG("Sending response (size: %d, retcode: %s)", |
3764 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3765 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3766 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3767 | if (ret < 0) { |
3768 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3769 | } |
1d4b027a | 3770 | |
5eb91c98 | 3771 | /* End of transmission */ |
273ea72c | 3772 | close(sock); |
be040666 DG |
3773 | |
3774 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3775 | } |
3776 | ||
5eb91c98 DG |
3777 | error: |
3778 | DBG("Client thread dying"); | |
273ea72c | 3779 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3780 | close(client_sock); |
3781 | close(sock); | |
273ea72c | 3782 | |
5eb91c98 | 3783 | lttng_poll_clean(&events); |
a2fb29a5 | 3784 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3785 | |
3786 | rcu_unregister_thread(); | |
1d4b027a DG |
3787 | return NULL; |
3788 | } | |
3789 | ||
3790 | ||
fac6795d DG |
3791 | /* |
3792 | * usage function on stderr | |
3793 | */ | |
3794 | static void usage(void) | |
3795 | { | |
b716ce68 | 3796 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3797 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3798 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3799 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3800 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3801 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3802 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3803 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3804 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3805 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3806 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3807 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3808 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3809 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3810 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3811 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3812 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3813 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3814 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3815 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3816 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3817 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3818 | } |
3819 | ||
3820 | /* | |
3821 | * daemon argument parsing | |
3822 | */ | |
3823 | static int parse_args(int argc, char **argv) | |
3824 | { | |
3825 | int c; | |
3826 | ||
3827 | static struct option long_options[] = { | |
3828 | { "client-sock", 1, 0, 'c' }, | |
3829 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3830 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3831 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3832 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3833 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3834 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3835 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3836 | { "consumerd32-path", 1, 0, 'u' }, | |
3837 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3838 | { "consumerd64-path", 1, 0, 't' }, | |
3839 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3840 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3841 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3842 | { "help", 0, 0, 'h' }, |
3843 | { "group", 1, 0, 'g' }, | |
3844 | { "version", 0, 0, 'V' }, | |
75462a81 | 3845 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3846 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3847 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3848 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3849 | { NULL, 0, 0, 0 } |
3850 | }; | |
3851 | ||
3852 | while (1) { | |
3853 | int option_index = 0; | |
4fba7219 | 3854 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3855 | long_options, &option_index); |
fac6795d DG |
3856 | if (c == -1) { |
3857 | break; | |
3858 | } | |
3859 | ||
3860 | switch (c) { | |
3861 | case 0: | |
3862 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3863 | if (optarg) { | |
3864 | fprintf(stderr, " with arg %s\n", optarg); | |
3865 | } | |
3866 | break; | |
b716ce68 | 3867 | case 'c': |
fac6795d DG |
3868 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3869 | break; | |
3870 | case 'a': | |
3871 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3872 | break; | |
3873 | case 'd': | |
3874 | opt_daemon = 1; | |
3875 | break; | |
3876 | case 'g': | |
fb09408a | 3877 | opt_tracing_group = optarg; |
fac6795d DG |
3878 | break; |
3879 | case 'h': | |
3880 | usage(); | |
3881 | exit(EXIT_FAILURE); | |
3882 | case 'V': | |
3883 | fprintf(stdout, "%s\n", VERSION); | |
3884 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3885 | case 'S': |
3886 | opt_sig_parent = 1; | |
3887 | break; | |
d6f42150 | 3888 | case 'E': |
3bd1e081 | 3889 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3890 | break; |
3891 | case 'C': | |
3bd1e081 MD |
3892 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3893 | break; | |
3894 | case 'F': | |
7753dea8 | 3895 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3896 | break; |
3897 | case 'D': | |
7753dea8 MD |
3898 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3899 | break; | |
3900 | case 'H': | |
3901 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3902 | break; | |
3903 | case 'G': | |
3904 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3905 | break; |
4fba7219 DG |
3906 | case 'N': |
3907 | opt_no_kernel = 1; | |
3908 | break; | |
75462a81 DG |
3909 | case 'q': |
3910 | opt_quiet = 1; | |
3911 | break; | |
3f9947db | 3912 | case 'v': |
53086306 DG |
3913 | /* Verbose level can increase using multiple -v */ |
3914 | opt_verbose += 1; | |
3f9947db | 3915 | break; |
31f73cc9 | 3916 | case 'Z': |
3bd1e081 | 3917 | opt_verbose_consumer += 1; |
31f73cc9 | 3918 | break; |
fb09408a | 3919 | case 'u': |
fc7a59ce | 3920 | consumerd32_bin= optarg; |
ebaeda94 MD |
3921 | break; |
3922 | case 'U': | |
3923 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3924 | break; |
3925 | case 't': | |
fc7a59ce | 3926 | consumerd64_bin = optarg; |
ebaeda94 MD |
3927 | break; |
3928 | case 'T': | |
3929 | consumerd64_libdir = optarg; | |
fb09408a | 3930 | break; |
fac6795d DG |
3931 | default: |
3932 | /* Unknown option or other error. | |
3933 | * Error is printed by getopt, just return */ | |
3934 | return -1; | |
3935 | } | |
3936 | } | |
3937 | ||
3938 | return 0; | |
3939 | } | |
3940 | ||
3941 | /* | |
d063d709 | 3942 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3943 | * apps_sock - The communication socket for all UST apps. |
3944 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3945 | */ |
cf3af59e | 3946 | static int init_daemon_socket(void) |
fac6795d DG |
3947 | { |
3948 | int ret = 0; | |
3949 | mode_t old_umask; | |
3950 | ||
3951 | old_umask = umask(0); | |
3952 | ||
3953 | /* Create client tool unix socket */ | |
d6f42150 DG |
3954 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3955 | if (client_sock < 0) { | |
3956 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3957 | ret = -1; |
3958 | goto end; | |
3959 | } | |
3960 | ||
3961 | /* File permission MUST be 660 */ | |
3962 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3963 | if (ret < 0) { | |
d6f42150 | 3964 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3965 | perror("chmod"); |
3966 | goto end; | |
3967 | } | |
3968 | ||
3969 | /* Create the application unix socket */ | |
d6f42150 DG |
3970 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3971 | if (apps_sock < 0) { | |
3972 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3973 | ret = -1; |
3974 | goto end; | |
3975 | } | |
3976 | ||
d6f42150 | 3977 | /* File permission MUST be 666 */ |
54d01ffb DG |
3978 | ret = chmod(apps_unix_sock_path, |
3979 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3980 | if (ret < 0) { |
d6f42150 | 3981 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3982 | perror("chmod"); |
3983 | goto end; | |
3984 | } | |
3985 | ||
3986 | end: | |
3987 | umask(old_umask); | |
3988 | return ret; | |
3989 | } | |
3990 | ||
3991 | /* | |
54d01ffb DG |
3992 | * Check if the global socket is available, and if a daemon is answering at the |
3993 | * other side. If yes, error is returned. | |
fac6795d | 3994 | */ |
cf3af59e | 3995 | static int check_existing_daemon(void) |
fac6795d | 3996 | { |
7d8234d9 | 3997 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3998 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3999 | return 0; |
099e26bd | 4000 | } |
54d01ffb | 4001 | |
7d8234d9 | 4002 | /* Is there anybody out there ? */ |
099e26bd | 4003 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4004 | return -EEXIST; |
099e26bd | 4005 | } else { |
7d8234d9 | 4006 | return 0; |
099e26bd | 4007 | } |
fac6795d DG |
4008 | } |
4009 | ||
fac6795d | 4010 | /* |
d063d709 | 4011 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4012 | * |
d063d709 DG |
4013 | * Race window between mkdir and chown is OK because we are going from more |
4014 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4015 | */ |
be040666 | 4016 | static int set_permissions(char *rundir) |
fac6795d DG |
4017 | { |
4018 | int ret; | |
996b65c8 | 4019 | gid_t gid; |
fac6795d | 4020 | |
996b65c8 MD |
4021 | gid = allowed_group(); |
4022 | if (gid < 0) { | |
be040666 DG |
4023 | WARN("No tracing group detected"); |
4024 | ret = 0; | |
fac6795d DG |
4025 | goto end; |
4026 | } | |
4027 | ||
d6f42150 | 4028 | /* Set lttng run dir */ |
be040666 | 4029 | ret = chown(rundir, 0, gid); |
d6f42150 | 4030 | if (ret < 0) { |
be040666 | 4031 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4032 | perror("chown"); |
4033 | } | |
4034 | ||
4035 | /* lttng client socket path */ | |
996b65c8 | 4036 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4037 | if (ret < 0) { |
d6f42150 DG |
4038 | ERR("Unable to set group on %s", client_unix_sock_path); |
4039 | perror("chown"); | |
4040 | } | |
4041 | ||
3bd1e081 MD |
4042 | /* kconsumer error socket path */ |
4043 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4044 | if (ret < 0) { |
3bd1e081 MD |
4045 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4046 | perror("chown"); | |
4047 | } | |
4048 | ||
7753dea8 MD |
4049 | /* 64-bit ustconsumer error socket path */ |
4050 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4051 | if (ret < 0) { | |
4052 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4053 | perror("chown"); | |
4054 | } | |
4055 | ||
4056 | /* 32-bit ustconsumer compat32 error socket path */ | |
4057 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4058 | if (ret < 0) { |
7753dea8 | 4059 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4060 | perror("chown"); |
4061 | } | |
4062 | ||
d6f42150 | 4063 | DBG("All permissions are set"); |
e07ae692 | 4064 | |
fac6795d DG |
4065 | end: |
4066 | return ret; | |
4067 | } | |
4068 | ||
7a485870 | 4069 | /* |
d063d709 | 4070 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4071 | */ |
4072 | static int create_kernel_poll_pipe(void) | |
4073 | { | |
4074 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4075 | } | |
4076 | ||
099e26bd DG |
4077 | /* |
4078 | * Create the application command pipe to wake thread_manage_apps. | |
4079 | */ | |
4080 | static int create_apps_cmd_pipe(void) | |
4081 | { | |
4082 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4083 | } | |
4084 | ||
d6f42150 | 4085 | /* |
d063d709 | 4086 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4087 | */ |
67e40797 | 4088 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4089 | { |
4090 | int ret; | |
4091 | ||
67e40797 DG |
4092 | DBG3("Creating LTTng run directory: %s", rundir); |
4093 | ||
4094 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4095 | if (ret < 0) { |
b1f11e69 | 4096 | if (errno != EEXIST) { |
67e40797 | 4097 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4098 | goto error; |
4099 | } else { | |
4100 | ret = 0; | |
4101 | } | |
d6f42150 DG |
4102 | } |
4103 | ||
4104 | error: | |
4105 | return ret; | |
4106 | } | |
4107 | ||
4108 | /* | |
d063d709 DG |
4109 | * Setup sockets and directory needed by the kconsumerd communication with the |
4110 | * session daemon. | |
d6f42150 | 4111 | */ |
67e40797 DG |
4112 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4113 | const char *rundir) | |
d6f42150 DG |
4114 | { |
4115 | int ret; | |
67e40797 | 4116 | char path[PATH_MAX]; |
d6f42150 | 4117 | |
67e40797 | 4118 | switch (consumer_data->type) { |
7753dea8 | 4119 | case LTTNG_CONSUMER_KERNEL: |
67e40797 | 4120 | snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4121 | break; |
4122 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 4123 | snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4124 | break; |
4125 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 4126 | snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4127 | break; |
4128 | default: | |
4129 | ERR("Consumer type unknown"); | |
4130 | ret = -EINVAL; | |
4131 | goto error; | |
d6f42150 DG |
4132 | } |
4133 | ||
67e40797 DG |
4134 | DBG2("Creating consumer directory: %s", path); |
4135 | ||
3bd1e081 | 4136 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4137 | if (ret < 0) { |
6beb2242 | 4138 | if (errno != EEXIST) { |
3bd1e081 | 4139 | ERR("Failed to create %s", path); |
6beb2242 DG |
4140 | goto error; |
4141 | } | |
4142 | ret = 0; | |
d6f42150 DG |
4143 | } |
4144 | ||
4145 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4146 | consumer_data->err_sock = |
4147 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4148 | if (consumer_data->err_sock < 0) { | |
4149 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4150 | ret = -1; |
4151 | goto error; | |
4152 | } | |
4153 | ||
4154 | /* File permission MUST be 660 */ | |
3bd1e081 | 4155 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4156 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4157 | if (ret < 0) { |
3bd1e081 | 4158 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4159 | PERROR("chmod"); |
d6f42150 DG |
4160 | goto error; |
4161 | } | |
4162 | ||
4163 | error: | |
4164 | return ret; | |
4165 | } | |
4166 | ||
fac6795d | 4167 | /* |
d063d709 | 4168 | * Signal handler for the daemon |
cf3af59e | 4169 | * |
54d01ffb DG |
4170 | * Simply stop all worker threads, leaving main() return gracefully after |
4171 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4172 | */ |
4173 | static void sighandler(int sig) | |
4174 | { | |
4175 | switch (sig) { | |
cf3af59e MD |
4176 | case SIGPIPE: |
4177 | DBG("SIGPIPE catched"); | |
4178 | return; | |
4179 | case SIGINT: | |
4180 | DBG("SIGINT catched"); | |
4181 | stop_threads(); | |
4182 | break; | |
4183 | case SIGTERM: | |
4184 | DBG("SIGTERM catched"); | |
4185 | stop_threads(); | |
4186 | break; | |
4187 | default: | |
4188 | break; | |
fac6795d | 4189 | } |
fac6795d DG |
4190 | } |
4191 | ||
4192 | /* | |
d063d709 | 4193 | * Setup signal handler for : |
1d4b027a | 4194 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4195 | */ |
1d4b027a | 4196 | static int set_signal_handler(void) |
fac6795d | 4197 | { |
1d4b027a DG |
4198 | int ret = 0; |
4199 | struct sigaction sa; | |
4200 | sigset_t sigset; | |
fac6795d | 4201 | |
1d4b027a DG |
4202 | if ((ret = sigemptyset(&sigset)) < 0) { |
4203 | perror("sigemptyset"); | |
4204 | return ret; | |
4205 | } | |
d6f42150 | 4206 | |
1d4b027a DG |
4207 | sa.sa_handler = sighandler; |
4208 | sa.sa_mask = sigset; | |
4209 | sa.sa_flags = 0; | |
4210 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4211 | perror("sigaction"); | |
4212 | return ret; | |
d6f42150 DG |
4213 | } |
4214 | ||
1d4b027a DG |
4215 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4216 | perror("sigaction"); | |
4217 | return ret; | |
d6f42150 | 4218 | } |
aaf26714 | 4219 | |
1d4b027a DG |
4220 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4221 | perror("sigaction"); | |
4222 | return ret; | |
8c0faa1d DG |
4223 | } |
4224 | ||
1d4b027a DG |
4225 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4226 | ||
4227 | return ret; | |
fac6795d DG |
4228 | } |
4229 | ||
f3ed775e | 4230 | /* |
d063d709 DG |
4231 | * Set open files limit to unlimited. This daemon can open a large number of |
4232 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4233 | */ |
4234 | static void set_ulimit(void) | |
4235 | { | |
4236 | int ret; | |
4237 | struct rlimit lim; | |
4238 | ||
a88df331 | 4239 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4240 | lim.rlim_cur = 65535; |
4241 | lim.rlim_max = 65535; | |
4242 | ||
4243 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4244 | if (ret < 0) { | |
4245 | perror("failed to set open files limit"); | |
4246 | } | |
4247 | } | |
4248 | ||
fac6795d DG |
4249 | /* |
4250 | * main | |
4251 | */ | |
4252 | int main(int argc, char **argv) | |
4253 | { | |
fac6795d DG |
4254 | int ret = 0; |
4255 | void *status; | |
b082db07 | 4256 | const char *home_path; |
fac6795d | 4257 | |
f6a9efaa DG |
4258 | rcu_register_thread(); |
4259 | ||
273ea72c | 4260 | /* Create thread quit pipe */ |
cf3af59e MD |
4261 | if ((ret = init_thread_quit_pipe()) < 0) { |
4262 | goto error; | |
273ea72c DG |
4263 | } |
4264 | ||
7753dea8 | 4265 | setup_consumerd_path(); |
fb09408a | 4266 | |
fac6795d DG |
4267 | /* Parse arguments */ |
4268 | progname = argv[0]; | |
4269 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4270 | goto error; |
fac6795d DG |
4271 | } |
4272 | ||
4273 | /* Daemonize */ | |
4274 | if (opt_daemon) { | |
53094c05 DG |
4275 | ret = daemon(0, 0); |
4276 | if (ret < 0) { | |
4277 | perror("daemon"); | |
cf3af59e | 4278 | goto error; |
53094c05 | 4279 | } |
fac6795d DG |
4280 | } |
4281 | ||
4282 | /* Check if daemon is UID = 0 */ | |
4283 | is_root = !getuid(); | |
4284 | ||
fac6795d | 4285 | if (is_root) { |
67e40797 DG |
4286 | rundir = strdup(LTTNG_RUNDIR); |
4287 | ||
4288 | /* Create global run dir with root access */ | |
4289 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4290 | if (ret < 0) { |
cf3af59e | 4291 | goto error; |
d6f42150 DG |
4292 | } |
4293 | ||
fac6795d | 4294 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4295 | snprintf(apps_unix_sock_path, PATH_MAX, |
4296 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4297 | } |
4298 | ||
4299 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4300 | snprintf(client_unix_sock_path, PATH_MAX, |
4301 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4302 | } | |
0fdd1e2c DG |
4303 | |
4304 | /* Set global SHM for ust */ | |
4305 | if (strlen(wait_shm_path) == 0) { | |
4306 | snprintf(wait_shm_path, PATH_MAX, | |
4307 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4308 | } | |
67e40797 DG |
4309 | |
4310 | /* Setup kernel consumerd path */ | |
4311 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
4312 | KCONSUMERD_ERR_SOCK_PATH, rundir); | |
4313 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
4314 | KCONSUMERD_CMD_SOCK_PATH, rundir); | |
4315 | ||
4316 | DBG2("Kernel consumer err path: %s", | |
4317 | kconsumer_data.err_unix_sock_path); | |
4318 | DBG2("Kernel consumer cmd path: %s", | |
4319 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4320 | } else { |
b082db07 DG |
4321 | home_path = get_home_dir(); |
4322 | if (home_path == NULL) { | |
273ea72c DG |
4323 | /* TODO: Add --socket PATH option */ |
4324 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4325 | ret = -EPERM; |
4326 | goto error; | |
b082db07 DG |
4327 | } |
4328 | ||
67e40797 DG |
4329 | /* |
4330 | * Create rundir from home path. This will create something like | |
4331 | * $HOME/.lttng | |
4332 | */ | |
4333 | ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); | |
4334 | if (ret < 0) { | |
4335 | ret = -ENOMEM; | |
4336 | goto error; | |
4337 | } | |
4338 | ||
4339 | ret = create_lttng_rundir(rundir); | |
4340 | if (ret < 0) { | |
4341 | goto error; | |
4342 | } | |
4343 | ||
fac6795d | 4344 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4345 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4346 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4347 | } |
4348 | ||
4349 | /* Set the cli tool unix socket path */ | |
4350 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4351 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4352 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4353 | } |
0fdd1e2c DG |
4354 | |
4355 | /* Set global SHM for ust */ | |
4356 | if (strlen(wait_shm_path) == 0) { | |
4357 | snprintf(wait_shm_path, PATH_MAX, | |
4358 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4359 | } | |
fac6795d DG |
4360 | } |
4361 | ||
847177cd DG |
4362 | DBG("Client socket path %s", client_unix_sock_path); |
4363 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4364 | DBG("LTTng run directory path: %s", rundir); |
4365 | ||
4366 | /* 32 bits consumerd path setup */ | |
4367 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
4368 | USTCONSUMERD32_ERR_SOCK_PATH, rundir); | |
4369 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
4370 | USTCONSUMERD32_CMD_SOCK_PATH, rundir); | |
4371 | ||
4372 | DBG2("UST consumer 32 bits err path: %s", | |
4373 | ustconsumer32_data.err_unix_sock_path); | |
4374 | DBG2("UST consumer 32 bits cmd path: %s", | |
4375 | ustconsumer32_data.cmd_unix_sock_path); | |
4376 | ||
4377 | /* 64 bits consumerd path setup */ | |
4378 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
4379 | USTCONSUMERD64_ERR_SOCK_PATH, rundir); | |
4380 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
4381 | USTCONSUMERD64_CMD_SOCK_PATH, rundir); | |
4382 | ||
4383 | DBG2("UST consumer 64 bits err path: %s", | |
4384 | ustconsumer64_data.err_unix_sock_path); | |
4385 | DBG2("UST consumer 64 bits cmd path: %s", | |
4386 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4387 | |
273ea72c | 4388 | /* |
7d8234d9 | 4389 | * See if daemon already exist. |
fac6795d | 4390 | */ |
7d8234d9 | 4391 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4392 | ERR("Already running daemon.\n"); |
273ea72c | 4393 | /* |
cf3af59e MD |
4394 | * We do not goto exit because we must not cleanup() |
4395 | * because a daemon is already running. | |
ab118b20 | 4396 | */ |
cf3af59e | 4397 | goto error; |
a88df331 DG |
4398 | } |
4399 | ||
54d01ffb | 4400 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4401 | |
4402 | /* | |
4403 | * These actions must be executed as root. We do that *after* setting up | |
4404 | * the sockets path because we MUST make the check for another daemon using | |
4405 | * those paths *before* trying to set the kernel consumer sockets and init | |
4406 | * kernel tracer. | |
4407 | */ | |
4408 | if (is_root) { | |
67e40797 | 4409 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4410 | if (ret < 0) { |
4411 | goto exit; | |
4412 | } | |
4413 | ||
a88df331 | 4414 | /* Setup kernel tracer */ |
4fba7219 DG |
4415 | if (!opt_no_kernel) { |
4416 | init_kernel_tracer(); | |
4417 | } | |
a88df331 DG |
4418 | |
4419 | /* Set ulimit for open files */ | |
4420 | set_ulimit(); | |
fac6795d DG |
4421 | } |
4422 | ||
67e40797 DG |
4423 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4424 | if (ret < 0) { | |
4425 | goto exit; | |
4426 | } | |
4427 | ||
4428 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4429 | if (ret < 0) { | |
4430 | goto exit; | |
4431 | } | |
4432 | ||
cf3af59e MD |
4433 | if ((ret = set_signal_handler()) < 0) { |
4434 | goto exit; | |
fac6795d DG |
4435 | } |
4436 | ||
d6f42150 | 4437 | /* Setup the needed unix socket */ |
cf3af59e MD |
4438 | if ((ret = init_daemon_socket()) < 0) { |
4439 | goto exit; | |
fac6795d DG |
4440 | } |
4441 | ||
4442 | /* Set credentials to socket */ | |
be040666 | 4443 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4444 | goto exit; |
fac6795d DG |
4445 | } |
4446 | ||
5b8719f5 DG |
4447 | /* Get parent pid if -S, --sig-parent is specified. */ |
4448 | if (opt_sig_parent) { | |
4449 | ppid = getppid(); | |
4450 | } | |
4451 | ||
7a485870 | 4452 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4453 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4454 | goto exit; | |
7a485870 DG |
4455 | } |
4456 | ||
099e26bd DG |
4457 | /* Setup the thread apps communication pipe. */ |
4458 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4459 | goto exit; | |
4460 | } | |
4461 | ||
4462 | /* Init UST command queue. */ | |
4463 | cds_wfq_init(&ust_cmd_queue.queue); | |
4464 | ||
f6a9efaa DG |
4465 | /* Init UST app hash table */ |
4466 | ust_app_ht_alloc(); | |
4467 | ||
273ea72c | 4468 | /* |
54d01ffb DG |
4469 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4470 | * statically declared in session.c | |
273ea72c | 4471 | */ |
54d01ffb | 4472 | session_list_ptr = session_get_list(); |
b5541356 | 4473 | |
5eb91c98 DG |
4474 | /* Set up max poll set size */ |
4475 | lttng_poll_set_max_size(); | |
4476 | ||
cf3af59e | 4477 | /* Create thread to manage the client socket */ |
099e26bd DG |
4478 | ret = pthread_create(&client_thread, NULL, |
4479 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4480 | if (ret != 0) { |
099e26bd | 4481 | perror("pthread_create clients"); |
cf3af59e MD |
4482 | goto exit_client; |
4483 | } | |
fac6795d | 4484 | |
099e26bd DG |
4485 | /* Create thread to dispatch registration */ |
4486 | ret = pthread_create(&dispatch_thread, NULL, | |
4487 | thread_dispatch_ust_registration, (void *) NULL); | |
4488 | if (ret != 0) { | |
4489 | perror("pthread_create dispatch"); | |
4490 | goto exit_dispatch; | |
4491 | } | |
4492 | ||
4493 | /* Create thread to manage application registration. */ | |
4494 | ret = pthread_create(®_apps_thread, NULL, | |
4495 | thread_registration_apps, (void *) NULL); | |
4496 | if (ret != 0) { | |
4497 | perror("pthread_create registration"); | |
4498 | goto exit_reg_apps; | |
4499 | } | |
4500 | ||
cf3af59e | 4501 | /* Create thread to manage application socket */ |
54d01ffb DG |
4502 | ret = pthread_create(&apps_thread, NULL, |
4503 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4504 | if (ret != 0) { |
099e26bd | 4505 | perror("pthread_create apps"); |
cf3af59e MD |
4506 | goto exit_apps; |
4507 | } | |
fac6795d | 4508 | |
cf3af59e | 4509 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4510 | ret = pthread_create(&kernel_thread, NULL, |
4511 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4512 | if (ret != 0) { |
099e26bd | 4513 | perror("pthread_create kernel"); |
cf3af59e MD |
4514 | goto exit_kernel; |
4515 | } | |
7a485870 | 4516 | |
cf3af59e MD |
4517 | ret = pthread_join(kernel_thread, &status); |
4518 | if (ret != 0) { | |
4519 | perror("pthread_join"); | |
4520 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4521 | } |
4522 | ||
cf3af59e MD |
4523 | exit_kernel: |
4524 | ret = pthread_join(apps_thread, &status); | |
4525 | if (ret != 0) { | |
4526 | perror("pthread_join"); | |
4527 | goto error; /* join error, exit without cleanup */ | |
4528 | } | |
fac6795d | 4529 | |
cf3af59e | 4530 | exit_apps: |
099e26bd DG |
4531 | ret = pthread_join(reg_apps_thread, &status); |
4532 | if (ret != 0) { | |
4533 | perror("pthread_join"); | |
4534 | goto error; /* join error, exit without cleanup */ | |
4535 | } | |
4536 | ||
4537 | exit_reg_apps: | |
4538 | ret = pthread_join(dispatch_thread, &status); | |
4539 | if (ret != 0) { | |
4540 | perror("pthread_join"); | |
4541 | goto error; /* join error, exit without cleanup */ | |
4542 | } | |
4543 | ||
4544 | exit_dispatch: | |
cf3af59e MD |
4545 | ret = pthread_join(client_thread, &status); |
4546 | if (ret != 0) { | |
4547 | perror("pthread_join"); | |
4548 | goto error; /* join error, exit without cleanup */ | |
4549 | } | |
4550 | ||
3bd1e081 | 4551 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4552 | if (ret != 0) { |
3bd1e081 | 4553 | perror("join_consumer"); |
cf3af59e MD |
4554 | goto error; /* join error, exit without cleanup */ |
4555 | } | |
a88df331 | 4556 | |
cf3af59e | 4557 | exit_client: |
a88df331 | 4558 | exit: |
cf3af59e MD |
4559 | /* |
4560 | * cleanup() is called when no other thread is running. | |
4561 | */ | |
f6a9efaa | 4562 | rcu_thread_online(); |
cf3af59e | 4563 | cleanup(); |
f6a9efaa DG |
4564 | rcu_thread_offline(); |
4565 | rcu_unregister_thread(); | |
67e40797 | 4566 | if (!ret) { |
cf3af59e | 4567 | exit(EXIT_SUCCESS); |
67e40797 | 4568 | } |
cf3af59e | 4569 | error: |
5e16da05 | 4570 | exit(EXIT_FAILURE); |
fac6795d | 4571 | } |