Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
990570ed | 41 | #include <common/common.h> |
0ba98ebc | 42 | #include <common/compat/poll.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
54d01ffb | 48 | #include "channel.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
4771f025 | 52 | #include "kernel.h" |
0fdd1e2c | 53 | #include "shm.h" |
1e307fab | 54 | #include "ust-ctl.h" |
8e68d1c8 | 55 | #include "utils.h" |
fac6795d | 56 | |
ebaeda94 MD |
57 | #define CONSUMERD_FILE "lttng-consumerd" |
58 | ||
3bd1e081 MD |
59 | struct consumer_data { |
60 | enum lttng_consumer_type type; | |
61 | ||
62 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
63 | sem_t sem; | |
64 | ||
65 | /* Mutex to control consumerd pid assignation */ | |
66 | pthread_mutex_t pid_mutex; | |
67 | pid_t pid; | |
68 | ||
69 | int err_sock; | |
70 | int cmd_sock; | |
71 | ||
72 | /* consumer error and command Unix socket path */ | |
73 | char err_unix_sock_path[PATH_MAX]; | |
74 | char cmd_unix_sock_path[PATH_MAX]; | |
75 | }; | |
76 | ||
75462a81 | 77 | /* Const values */ |
686204ab | 78 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 79 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
80 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
81 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
82 | ||
fac6795d | 83 | /* Variables */ |
1d4b027a | 84 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 85 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 86 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 87 | |
fac6795d DG |
88 | const char *progname; |
89 | const char *opt_tracing_group; | |
5b8719f5 | 90 | static int opt_sig_parent; |
fac6795d | 91 | static int opt_daemon; |
4fba7219 | 92 | static int opt_no_kernel; |
fac6795d | 93 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 95 | static char *rundir; |
3bd1e081 MD |
96 | |
97 | /* Consumer daemon specific control data */ | |
98 | static struct consumer_data kconsumer_data = { | |
99 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
100 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
101 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 102 | }; |
7753dea8 MD |
103 | static struct consumer_data ustconsumer64_data = { |
104 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
105 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
106 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
7753dea8 MD |
107 | }; |
108 | static struct consumer_data ustconsumer32_data = { | |
109 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
110 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
111 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
112 | }; |
113 | ||
099e26bd | 114 | static int dispatch_thread_exit; |
fac6795d | 115 | |
54d01ffb DG |
116 | /* Global application Unix socket path */ |
117 | static char apps_unix_sock_path[PATH_MAX]; | |
118 | /* Global client Unix socket path */ | |
119 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
120 | /* global wait shm path for UST */ |
121 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 122 | |
1d4b027a | 123 | /* Sockets and FDs */ |
d6f42150 DG |
124 | static int client_sock; |
125 | static int apps_sock; | |
20fe2104 | 126 | static int kernel_tracer_fd; |
7a485870 | 127 | static int kernel_poll_pipe[2]; |
1d4b027a | 128 | |
273ea72c DG |
129 | /* |
130 | * Quit pipe for all threads. This permits a single cancellation point | |
131 | * for all threads when receiving an event on the pipe. | |
132 | */ | |
133 | static int thread_quit_pipe[2]; | |
134 | ||
099e26bd DG |
135 | /* |
136 | * This pipe is used to inform the thread managing application communication | |
137 | * that a command is queued and ready to be processed. | |
138 | */ | |
139 | static int apps_cmd_pipe[2]; | |
140 | ||
1d4b027a | 141 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 142 | static pthread_t apps_thread; |
099e26bd | 143 | static pthread_t reg_apps_thread; |
1d4b027a | 144 | static pthread_t client_thread; |
7a485870 | 145 | static pthread_t kernel_thread; |
099e26bd | 146 | static pthread_t dispatch_thread; |
5eb91c98 | 147 | |
fac6795d | 148 | |
099e26bd DG |
149 | /* |
150 | * UST registration command queue. This queue is tied with a futex and uses a N | |
151 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
152 | * | |
153 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
154 | * this queue and the wait/wake scheme. | |
155 | */ | |
156 | static struct ust_cmd_queue ust_cmd_queue; | |
157 | ||
b5541356 DG |
158 | /* |
159 | * Pointer initialized before thread creation. | |
160 | * | |
161 | * This points to the tracing session list containing the session count and a | |
162 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
163 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 164 | * |
d063d709 | 165 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 166 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
167 | */ |
168 | static struct ltt_session_list *session_list_ptr; | |
169 | ||
7753dea8 MD |
170 | int ust_consumerd64_fd = -1; |
171 | int ust_consumerd32_fd = -1; | |
172 | ||
fb6f1fa2 YB |
173 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
174 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
175 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
176 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
177 | |
178 | static | |
7753dea8 | 179 | void setup_consumerd_path(void) |
fb09408a | 180 | { |
fc7a59ce | 181 | const char *bin, *libdir; |
fb09408a | 182 | |
7753dea8 MD |
183 | /* |
184 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
185 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
186 | * has not been defined. | |
7753dea8 | 187 | */ |
ebaeda94 | 188 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
189 | if (!consumerd32_bin[0]) { |
190 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
191 | } |
192 | if (!consumerd32_libdir[0]) { | |
193 | consumerd32_libdir = INSTALL_LIB_PATH; | |
194 | } | |
195 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
196 | if (!consumerd64_bin[0]) { |
197 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 198 | } |
ebaeda94 MD |
199 | if (!consumerd64_libdir[0]) { |
200 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
201 | } |
202 | #else | |
203 | #error "Unknown bitness" | |
204 | #endif | |
205 | ||
fb09408a MD |
206 | /* |
207 | * runtime env. var. overrides the build default. | |
208 | */ | |
fc7a59ce AM |
209 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
210 | if (bin) { | |
211 | consumerd32_bin = bin; | |
7753dea8 | 212 | } |
fc7a59ce AM |
213 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
214 | if (bin) { | |
215 | consumerd64_bin = bin; | |
ebaeda94 MD |
216 | } |
217 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
218 | if (libdir) { | |
219 | consumerd32_libdir = libdir; | |
220 | } | |
221 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
222 | if (libdir) { | |
223 | consumerd64_libdir = libdir; | |
fb09408a MD |
224 | } |
225 | } | |
226 | ||
5eb91c98 DG |
227 | /* |
228 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
229 | */ | |
230 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
231 | unsigned int size) | |
232 | { | |
233 | int ret; | |
234 | ||
235 | if (events == NULL || size == 0) { | |
236 | ret = -1; | |
237 | goto error; | |
238 | } | |
239 | ||
240 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
241 | if (ret < 0) { | |
242 | goto error; | |
243 | } | |
244 | ||
245 | /* Add quit pipe */ | |
246 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
247 | if (ret < 0) { | |
248 | goto error; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | ||
253 | error: | |
254 | return ret; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Check if the thread quit pipe was triggered. | |
259 | * | |
260 | * Return 1 if it was triggered else 0; | |
261 | */ | |
262 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
263 | { | |
264 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
265 | return 1; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
0fdd1e2c DG |
271 | /* |
272 | * Remove modules in reverse load order. | |
273 | */ | |
274 | static int modprobe_remove_kernel_modules(void) | |
275 | { | |
276 | int ret = 0, i; | |
277 | char modprobe[256]; | |
278 | ||
279 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
280 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 281 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
282 | kernel_modules_list[i].name); |
283 | if (ret < 0) { | |
24b487b8 | 284 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
285 | goto error; |
286 | } | |
287 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
288 | ret = system(modprobe); | |
289 | if (ret == -1) { | |
24b487b8 | 290 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
291 | kernel_modules_list[i].name); |
292 | } else if (kernel_modules_list[i].required | |
293 | && WEXITSTATUS(ret) != 0) { | |
294 | ERR("Unable to remove module %s", | |
295 | kernel_modules_list[i].name); | |
296 | } else { | |
297 | DBG("Modprobe removal successful %s", | |
298 | kernel_modules_list[i].name); | |
299 | } | |
300 | } | |
301 | ||
302 | error: | |
303 | return ret; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Return group ID of the tracing group or -1 if not found. | |
308 | */ | |
996b65c8 MD |
309 | static gid_t allowed_group(void) |
310 | { | |
311 | struct group *grp; | |
312 | ||
274e143b MD |
313 | if (opt_tracing_group) { |
314 | grp = getgrnam(opt_tracing_group); | |
315 | } else { | |
316 | grp = getgrnam(default_tracing_group); | |
317 | } | |
996b65c8 MD |
318 | if (!grp) { |
319 | return -1; | |
320 | } else { | |
321 | return grp->gr_gid; | |
322 | } | |
323 | } | |
324 | ||
273ea72c | 325 | /* |
5eb91c98 | 326 | * Init thread quit pipe. |
273ea72c DG |
327 | * |
328 | * Return -1 on error or 0 if all pipes are created. | |
329 | */ | |
330 | static int init_thread_quit_pipe(void) | |
331 | { | |
332 | int ret; | |
333 | ||
334 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
335 | if (ret < 0) { | |
336 | perror("thread quit pipe"); | |
337 | goto error; | |
338 | } | |
339 | ||
340 | error: | |
341 | return ret; | |
342 | } | |
343 | ||
fac6795d | 344 | /* |
d063d709 DG |
345 | * Complete teardown of a kernel session. This free all data structure related |
346 | * to a kernel session and update counter. | |
fac6795d | 347 | */ |
1d4b027a | 348 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 349 | { |
8f7a84dd DG |
350 | if (!session->kernel_session) { |
351 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 352 | return; |
8f7a84dd DG |
353 | } |
354 | ||
84ea9c99 | 355 | DBG("Tearing down kernel session"); |
d9800920 | 356 | |
84ea9c99 MD |
357 | /* |
358 | * If a custom kernel consumer was registered, close the socket before | |
359 | * tearing down the complete kernel session structure | |
360 | */ | |
361 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
362 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 363 | } |
84ea9c99 MD |
364 | |
365 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
366 | } |
367 | ||
f6a9efaa DG |
368 | /* |
369 | * Complete teardown of all UST sessions. This will free everything on his path | |
370 | * and destroy the core essence of all ust sessions :) | |
371 | */ | |
372 | static void teardown_ust_session(struct ltt_session *session) | |
373 | { | |
84cd17c6 MD |
374 | int ret; |
375 | ||
8f7a84dd DG |
376 | if (!session->ust_session) { |
377 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 378 | return; |
8f7a84dd DG |
379 | } |
380 | ||
84ea9c99 | 381 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 382 | |
84cd17c6 MD |
383 | ret = ust_app_destroy_trace_all(session->ust_session); |
384 | if (ret) { | |
385 | ERR("Error in ust_app_destroy_trace_all"); | |
386 | } | |
8f7a84dd | 387 | |
f6a9efaa DG |
388 | trace_ust_destroy_session(session->ust_session); |
389 | } | |
390 | ||
099e26bd DG |
391 | /* |
392 | * Stop all threads by closing the thread quit pipe. | |
393 | */ | |
cf3af59e MD |
394 | static void stop_threads(void) |
395 | { | |
5eb91c98 DG |
396 | int ret; |
397 | ||
cf3af59e MD |
398 | /* Stopping all threads */ |
399 | DBG("Terminating all threads"); | |
54d01ffb | 400 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
401 | if (ret < 0) { |
402 | ERR("write error on thread quit pipe"); | |
403 | } | |
404 | ||
099e26bd DG |
405 | /* Dispatch thread */ |
406 | dispatch_thread_exit = 1; | |
407 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
408 | } |
409 | ||
fac6795d | 410 | /* |
d063d709 | 411 | * Cleanup the daemon |
fac6795d | 412 | */ |
cf3af59e | 413 | static void cleanup(void) |
fac6795d | 414 | { |
1d4b027a DG |
415 | int ret; |
416 | char *cmd; | |
af9737e9 | 417 | struct ltt_session *sess, *stmp; |
fac6795d | 418 | |
1d4b027a | 419 | DBG("Cleaning up"); |
e07ae692 | 420 | |
67e40797 DG |
421 | DBG("Removing %s directory", rundir); |
422 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
423 | if (ret < 0) { | |
424 | ERR("asprintf failed. Something is really wrong!"); | |
425 | } | |
5461b305 | 426 | |
67e40797 DG |
427 | /* Remove lttng run directory */ |
428 | ret = system(cmd); | |
429 | if (ret < 0) { | |
430 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 431 | } |
67e40797 | 432 | free(cmd); |
5461b305 | 433 | |
1d4b027a | 434 | DBG("Cleaning up all session"); |
fac6795d | 435 | |
b5541356 | 436 | /* Destroy session list mutex */ |
273ea72c DG |
437 | if (session_list_ptr != NULL) { |
438 | pthread_mutex_destroy(&session_list_ptr->lock); | |
439 | ||
440 | /* Cleanup ALL session */ | |
54d01ffb DG |
441 | cds_list_for_each_entry_safe(sess, stmp, |
442 | &session_list_ptr->head, list) { | |
273ea72c | 443 | teardown_kernel_session(sess); |
f6a9efaa DG |
444 | teardown_ust_session(sess); |
445 | free(sess); | |
273ea72c DG |
446 | } |
447 | } | |
448 | ||
099e26bd | 449 | DBG("Closing all UST sockets"); |
56fff090 | 450 | ust_app_clean_list(); |
099e26bd | 451 | |
3bd1e081 | 452 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 453 | |
4fba7219 DG |
454 | if (is_root && !opt_no_kernel) { |
455 | DBG2("Closing kernel fd"); | |
456 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
457 | DBG("Unloading kernel modules"); |
458 | modprobe_remove_kernel_modules(); | |
459 | } | |
5eb91c98 DG |
460 | |
461 | close(thread_quit_pipe[0]); | |
462 | close(thread_quit_pipe[1]); | |
421cb601 DG |
463 | |
464 | /* <fun> */ | |
f56a39af | 465 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
466 | "Matthew, BEET driven development works!%c[%dm", |
467 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
468 | /* </fun> */ | |
fac6795d DG |
469 | } |
470 | ||
e065084a | 471 | /* |
d063d709 | 472 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 473 | * |
d063d709 | 474 | * Return lttcomm error code. |
e065084a DG |
475 | */ |
476 | static int send_unix_sock(int sock, void *buf, size_t len) | |
477 | { | |
478 | /* Check valid length */ | |
479 | if (len <= 0) { | |
480 | return -1; | |
481 | } | |
482 | ||
483 | return lttcomm_send_unix_sock(sock, buf, len); | |
484 | } | |
485 | ||
5461b305 | 486 | /* |
d063d709 | 487 | * Free memory of a command context structure. |
5461b305 | 488 | */ |
a2fb29a5 | 489 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 490 | { |
a2fb29a5 DG |
491 | DBG("Clean command context structure"); |
492 | if (*cmd_ctx) { | |
493 | if ((*cmd_ctx)->llm) { | |
494 | free((*cmd_ctx)->llm); | |
5461b305 | 495 | } |
a2fb29a5 DG |
496 | if ((*cmd_ctx)->lsm) { |
497 | free((*cmd_ctx)->lsm); | |
5461b305 | 498 | } |
a2fb29a5 DG |
499 | free(*cmd_ctx); |
500 | *cmd_ctx = NULL; | |
5461b305 DG |
501 | } |
502 | } | |
503 | ||
f3ed775e | 504 | /* |
d063d709 | 505 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 506 | */ |
2bdd86d4 | 507 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
508 | int sock, struct ltt_kernel_channel *channel, |
509 | uid_t uid, gid_t gid) | |
f3ed775e DG |
510 | { |
511 | int ret; | |
f3ed775e | 512 | struct ltt_kernel_stream *stream; |
3bd1e081 | 513 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 514 | |
3bd1e081 | 515 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 516 | channel->channel->name); |
f3ed775e | 517 | |
3bd1e081 MD |
518 | /* Send channel */ |
519 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
520 | lkm.u.channel.channel_key = channel->fd; | |
521 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
522 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 523 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 524 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 525 | if (ret < 0) { |
3bd1e081 | 526 | perror("send consumer channel"); |
f3ed775e DG |
527 | goto error; |
528 | } | |
529 | ||
3bd1e081 | 530 | /* Send streams */ |
7a485870 | 531 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
532 | if (!stream->fd) { |
533 | continue; | |
534 | } | |
535 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
536 | lkm.u.stream.channel_key = channel->fd; | |
537 | lkm.u.stream.stream_key = stream->fd; | |
538 | lkm.u.stream.state = stream->state; | |
539 | lkm.u.stream.output = channel->channel->attr.output; | |
540 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
541 | lkm.u.stream.uid = uid; |
542 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
543 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
544 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
545 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
546 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
547 | if (ret < 0) { | |
548 | perror("send consumer stream"); | |
549 | goto error; | |
550 | } | |
551 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
552 | if (ret < 0) { | |
553 | perror("send consumer stream ancillary data"); | |
554 | goto error; | |
f3ed775e DG |
555 | } |
556 | } | |
557 | ||
3bd1e081 | 558 | DBG("consumer channel streams sent"); |
f3ed775e DG |
559 | |
560 | return 0; | |
561 | ||
562 | error: | |
563 | return ret; | |
564 | } | |
565 | ||
566 | /* | |
d063d709 | 567 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 568 | */ |
2bdd86d4 | 569 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 570 | struct ltt_kernel_session *session) |
f3ed775e DG |
571 | { |
572 | int ret; | |
573 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
574 | struct lttcomm_consumer_msg lkm; |
575 | int sock = session->consumer_fd; | |
7a485870 DG |
576 | |
577 | DBG("Sending metadata stream fd"); | |
578 | ||
2bdd86d4 | 579 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 580 | if (session->consumer_fd == 0) { |
3bd1e081 | 581 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
582 | } |
583 | ||
7a485870 | 584 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
585 | /* Send metadata channel fd */ |
586 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
587 | lkm.u.channel.channel_key = session->metadata->fd; | |
588 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
589 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
590 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
591 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
592 | if (ret < 0) { | |
593 | perror("send consumer channel"); | |
594 | goto error; | |
595 | } | |
596 | ||
597 | /* Send metadata stream fd */ | |
598 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
599 | lkm.u.stream.channel_key = session->metadata->fd; | |
600 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
601 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
602 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
603 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
604 | lkm.u.stream.uid = session->uid; |
605 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
606 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
607 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
608 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
609 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
610 | if (ret < 0) { | |
611 | perror("send consumer stream"); | |
612 | goto error; | |
613 | } | |
614 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 615 | if (ret < 0) { |
3bd1e081 | 616 | perror("send consumer stream"); |
7a485870 DG |
617 | goto error; |
618 | } | |
619 | } | |
f3ed775e | 620 | |
f3ed775e | 621 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
622 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
623 | session->uid, session->gid); | |
2bdd86d4 MD |
624 | if (ret < 0) { |
625 | goto error; | |
626 | } | |
627 | } | |
628 | ||
629 | DBG("consumer fds (metadata and channel streams) sent"); | |
630 | ||
631 | return 0; | |
632 | ||
633 | error: | |
634 | return ret; | |
635 | } | |
636 | ||
fac6795d | 637 | /* |
0fdd1e2c | 638 | * Notify UST applications using the shm mmap futex. |
fac6795d | 639 | */ |
0fdd1e2c | 640 | static int notify_ust_apps(int active) |
fac6795d | 641 | { |
0fdd1e2c | 642 | char *wait_shm_mmap; |
fac6795d | 643 | |
0fdd1e2c | 644 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 645 | |
0fdd1e2c DG |
646 | /* See shm.c for this call implying mmap, shm and futex calls */ |
647 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
648 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
649 | goto error; |
650 | } | |
651 | ||
0fdd1e2c DG |
652 | /* Wake waiting process */ |
653 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
654 | ||
655 | /* Apps notified successfully */ | |
656 | return 0; | |
fac6795d DG |
657 | |
658 | error: | |
0fdd1e2c | 659 | return -1; |
fac6795d DG |
660 | } |
661 | ||
e065084a | 662 | /* |
d063d709 DG |
663 | * Setup the outgoing data buffer for the response (llm) by allocating the |
664 | * right amount of memory and copying the original information from the lsm | |
665 | * structure. | |
ca95a216 | 666 | * |
d063d709 | 667 | * Return total size of the buffer pointed by buf. |
ca95a216 | 668 | */ |
5461b305 | 669 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 670 | { |
f3ed775e | 671 | int ret, buf_size; |
ca95a216 | 672 | |
f3ed775e | 673 | buf_size = size; |
5461b305 | 674 | |
ba7f0ae5 | 675 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 676 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 677 | perror("zmalloc"); |
5461b305 | 678 | ret = -ENOMEM; |
ca95a216 DG |
679 | goto error; |
680 | } | |
681 | ||
5461b305 DG |
682 | /* Copy common data */ |
683 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 684 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 685 | |
5461b305 DG |
686 | cmd_ctx->llm->data_size = size; |
687 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
688 | ||
ca95a216 DG |
689 | return buf_size; |
690 | ||
691 | error: | |
692 | return ret; | |
693 | } | |
694 | ||
7a485870 | 695 | /* |
5eb91c98 | 696 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 697 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 698 | */ |
5eb91c98 | 699 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 700 | { |
5eb91c98 | 701 | int ret; |
7a485870 DG |
702 | struct ltt_session *session; |
703 | struct ltt_kernel_channel *channel; | |
704 | ||
5eb91c98 | 705 | DBG("Updating kernel poll set"); |
7a485870 | 706 | |
54d01ffb | 707 | session_lock_list(); |
b5541356 | 708 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 709 | session_lock(session); |
7a485870 | 710 | if (session->kernel_session == NULL) { |
54d01ffb | 711 | session_unlock(session); |
7a485870 DG |
712 | continue; |
713 | } | |
7a485870 | 714 | |
54d01ffb DG |
715 | cds_list_for_each_entry(channel, |
716 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
717 | /* Add channel fd to the kernel poll set */ |
718 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
719 | if (ret < 0) { | |
54d01ffb | 720 | session_unlock(session); |
5eb91c98 DG |
721 | goto error; |
722 | } | |
723 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 724 | } |
54d01ffb | 725 | session_unlock(session); |
7a485870 | 726 | } |
54d01ffb | 727 | session_unlock_list(); |
7a485870 | 728 | |
5eb91c98 | 729 | return 0; |
7a485870 DG |
730 | |
731 | error: | |
54d01ffb | 732 | session_unlock_list(); |
7a485870 DG |
733 | return -1; |
734 | } | |
735 | ||
736 | /* | |
54d01ffb | 737 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 738 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 739 | * |
d063d709 | 740 | * Useful for CPU hotplug feature. |
7a485870 | 741 | */ |
2bdd86d4 | 742 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
743 | { |
744 | int ret = 0; | |
745 | struct ltt_session *session; | |
746 | struct ltt_kernel_channel *channel; | |
747 | ||
748 | DBG("Updating kernel streams for channel fd %d", fd); | |
749 | ||
54d01ffb | 750 | session_lock_list(); |
b5541356 | 751 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 752 | session_lock(session); |
7a485870 | 753 | if (session->kernel_session == NULL) { |
54d01ffb | 754 | session_unlock(session); |
7a485870 DG |
755 | continue; |
756 | } | |
d9800920 DG |
757 | |
758 | /* This is not suppose to be 0 but this is an extra security check */ | |
759 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 760 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
761 | } |
762 | ||
5eb91c98 DG |
763 | cds_list_for_each_entry(channel, |
764 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
765 | if (channel->fd == fd) { |
766 | DBG("Channel found, updating kernel streams"); | |
767 | ret = kernel_open_channel_stream(channel); | |
768 | if (ret < 0) { | |
b3c750d2 | 769 | goto error; |
7a485870 | 770 | } |
d9800920 | 771 | |
7a485870 | 772 | /* |
5eb91c98 DG |
773 | * Have we already sent fds to the consumer? If yes, it means |
774 | * that tracing is started so it is safe to send our updated | |
775 | * stream fds. | |
7a485870 | 776 | */ |
3bd1e081 | 777 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 778 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
779 | session->kernel_session->consumer_fd, channel, |
780 | session->uid, session->gid); | |
7a485870 | 781 | if (ret < 0) { |
b3c750d2 | 782 | goto error; |
7a485870 DG |
783 | } |
784 | } | |
b3c750d2 | 785 | goto error; |
7a485870 DG |
786 | } |
787 | } | |
54d01ffb | 788 | session_unlock(session); |
7a485870 | 789 | } |
54d01ffb | 790 | session_unlock_list(); |
b3c750d2 | 791 | return ret; |
7a485870 | 792 | |
b3c750d2 | 793 | error: |
54d01ffb DG |
794 | session_unlock(session); |
795 | session_unlock_list(); | |
7a485870 DG |
796 | return ret; |
797 | } | |
798 | ||
487cf67c DG |
799 | /* |
800 | * For each tracing session, update newly registered apps. | |
801 | */ | |
802 | static void update_ust_app(int app_sock) | |
803 | { | |
804 | struct ltt_session *sess, *stmp; | |
805 | ||
806 | /* For all tracing session(s) */ | |
807 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
808 | if (sess->ust_session) { |
809 | ust_app_global_update(sess->ust_session, app_sock); | |
810 | } | |
487cf67c DG |
811 | } |
812 | } | |
813 | ||
7a485870 | 814 | /* |
d063d709 | 815 | * This thread manage event coming from the kernel. |
7a485870 | 816 | * |
d063d709 DG |
817 | * Features supported in this thread: |
818 | * -) CPU Hotplug | |
7a485870 DG |
819 | */ |
820 | static void *thread_manage_kernel(void *data) | |
821 | { | |
5eb91c98 DG |
822 | int ret, i, pollfd, update_poll_flag = 1; |
823 | uint32_t revents, nb_fd; | |
7a485870 | 824 | char tmp; |
5eb91c98 | 825 | struct lttng_poll_event events; |
7a485870 DG |
826 | |
827 | DBG("Thread manage kernel started"); | |
828 | ||
5eb91c98 DG |
829 | ret = create_thread_poll_set(&events, 2); |
830 | if (ret < 0) { | |
831 | goto error; | |
832 | } | |
833 | ||
834 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
835 | if (ret < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
7a485870 DG |
839 | while (1) { |
840 | if (update_poll_flag == 1) { | |
5f822d0a DG |
841 | /* |
842 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
843 | * quit pipe and the kernel pipe. | |
844 | */ | |
845 | events.nb_fd = 2; | |
846 | ||
5eb91c98 DG |
847 | ret = update_kernel_poll(&events); |
848 | if (ret < 0) { | |
7a485870 DG |
849 | goto error; |
850 | } | |
851 | update_poll_flag = 0; | |
852 | } | |
853 | ||
5eb91c98 DG |
854 | nb_fd = LTTNG_POLL_GETNB(&events); |
855 | ||
856 | DBG("Thread kernel polling on %d fds", nb_fd); | |
857 | ||
858 | /* Zeroed the poll events */ | |
859 | lttng_poll_reset(&events); | |
7a485870 DG |
860 | |
861 | /* Poll infinite value of time */ | |
5eb91c98 | 862 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 863 | if (ret < 0) { |
7a485870 DG |
864 | goto error; |
865 | } else if (ret == 0) { | |
866 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
867 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
868 | "This should not have happened! Continuing..."); | |
7a485870 DG |
869 | continue; |
870 | } | |
871 | ||
5eb91c98 DG |
872 | for (i = 0; i < nb_fd; i++) { |
873 | /* Fetch once the poll data */ | |
874 | revents = LTTNG_POLL_GETEV(&events, i); | |
875 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 876 | |
5eb91c98 DG |
877 | /* Thread quit pipe has been closed. Killing thread. */ |
878 | ret = check_thread_quit_pipe(pollfd, revents); | |
879 | if (ret) { | |
880 | goto error; | |
881 | } | |
7a485870 | 882 | |
5eb91c98 DG |
883 | /* Check for data on kernel pipe */ |
884 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
885 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
886 | update_poll_flag = 1; | |
887 | continue; | |
888 | } else { | |
889 | /* | |
890 | * New CPU detected by the kernel. Adding kernel stream to | |
891 | * kernel session and updating the kernel consumer | |
892 | */ | |
893 | if (revents & LPOLLIN) { | |
2bdd86d4 | 894 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
895 | if (ret < 0) { |
896 | continue; | |
897 | } | |
898 | break; | |
899 | /* | |
900 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
901 | * and unregister kernel stream at this point. | |
902 | */ | |
7a485870 | 903 | } |
7a485870 DG |
904 | } |
905 | } | |
906 | } | |
907 | ||
908 | error: | |
909 | DBG("Kernel thread dying"); | |
273ea72c DG |
910 | close(kernel_poll_pipe[0]); |
911 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
912 | |
913 | lttng_poll_clean(&events); | |
914 | ||
7a485870 DG |
915 | return NULL; |
916 | } | |
917 | ||
1d4b027a | 918 | /* |
3bd1e081 | 919 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 920 | */ |
3bd1e081 | 921 | static void *thread_manage_consumer(void *data) |
1d4b027a | 922 | { |
5eb91c98 DG |
923 | int sock = 0, i, ret, pollfd; |
924 | uint32_t revents, nb_fd; | |
1d4b027a | 925 | enum lttcomm_return_code code; |
5eb91c98 | 926 | struct lttng_poll_event events; |
3bd1e081 | 927 | struct consumer_data *consumer_data = data; |
1d4b027a | 928 | |
3bd1e081 | 929 | DBG("[thread] Manage consumer started"); |
1d4b027a | 930 | |
3bd1e081 | 931 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
932 | if (ret < 0) { |
933 | goto error; | |
934 | } | |
935 | ||
5eb91c98 DG |
936 | /* |
937 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
938 | * Nothing more will be added to this poll set. | |
939 | */ | |
940 | ret = create_thread_poll_set(&events, 2); | |
941 | if (ret < 0) { | |
942 | goto error; | |
943 | } | |
273ea72c | 944 | |
3bd1e081 | 945 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
946 | if (ret < 0) { |
947 | goto error; | |
948 | } | |
949 | ||
950 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
951 | |
952 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 953 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 954 | if (ret < 0) { |
273ea72c DG |
955 | goto error; |
956 | } | |
957 | ||
5eb91c98 DG |
958 | for (i = 0; i < nb_fd; i++) { |
959 | /* Fetch once the poll data */ | |
960 | revents = LTTNG_POLL_GETEV(&events, i); | |
961 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
962 | ||
963 | /* Thread quit pipe has been closed. Killing thread. */ | |
964 | ret = check_thread_quit_pipe(pollfd, revents); | |
965 | if (ret) { | |
966 | goto error; | |
967 | } | |
968 | ||
969 | /* Event on the registration socket */ | |
3bd1e081 | 970 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 971 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 972 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
973 | goto error; |
974 | } | |
975 | } | |
273ea72c DG |
976 | } |
977 | ||
3bd1e081 | 978 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
979 | if (sock < 0) { |
980 | goto error; | |
981 | } | |
982 | ||
3bd1e081 | 983 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 984 | |
712ea556 | 985 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
986 | ret = lttcomm_recv_unix_sock(sock, &code, |
987 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
988 | if (ret <= 0) { |
989 | goto error; | |
990 | } | |
991 | ||
3bd1e081 MD |
992 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
993 | consumer_data->cmd_sock = | |
994 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
995 | if (consumer_data->cmd_sock < 0) { | |
996 | sem_post(&consumer_data->sem); | |
48842b30 | 997 | PERROR("consumer connect"); |
1d4b027a DG |
998 | goto error; |
999 | } | |
1000 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1001 | sem_post(&consumer_data->sem); |
1002 | DBG("consumer command socket ready"); | |
1d4b027a | 1003 | } else { |
3bd1e081 | 1004 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1005 | lttcomm_get_readable_code(-code)); |
1006 | goto error; | |
1007 | } | |
1008 | ||
54d01ffb | 1009 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1010 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1011 | if (ret < 0) { |
72079cae DG |
1012 | goto error; |
1013 | } | |
1014 | ||
5eb91c98 DG |
1015 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1016 | if (ret < 0) { | |
72079cae | 1017 | goto error; |
5eb91c98 DG |
1018 | } |
1019 | ||
1020 | /* Update number of fd */ | |
1021 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1022 | ||
1023 | /* Inifinite blocking call, waiting for transmission */ | |
1024 | ret = lttng_poll_wait(&events, -1); | |
1025 | if (ret < 0) { | |
72079cae DG |
1026 | goto error; |
1027 | } | |
1028 | ||
5eb91c98 DG |
1029 | for (i = 0; i < nb_fd; i++) { |
1030 | /* Fetch once the poll data */ | |
1031 | revents = LTTNG_POLL_GETEV(&events, i); | |
1032 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1033 | ||
1034 | /* Thread quit pipe has been closed. Killing thread. */ | |
1035 | ret = check_thread_quit_pipe(pollfd, revents); | |
1036 | if (ret) { | |
1037 | goto error; | |
1038 | } | |
1039 | ||
1040 | /* Event on the kconsumerd socket */ | |
1041 | if (pollfd == sock) { | |
1042 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1043 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1044 | goto error; |
1045 | } | |
1046 | } | |
1047 | } | |
1048 | ||
712ea556 | 1049 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1050 | ret = lttcomm_recv_unix_sock(sock, &code, |
1051 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1052 | if (ret <= 0) { |
3bd1e081 | 1053 | ERR("consumer closed the command socket"); |
712ea556 | 1054 | goto error; |
6f61d021 | 1055 | } |
1d4b027a | 1056 | |
3bd1e081 | 1057 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1058 | |
1d4b027a | 1059 | error: |
3bd1e081 MD |
1060 | DBG("consumer thread dying"); |
1061 | close(consumer_data->err_sock); | |
1062 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1063 | close(sock); |
273ea72c | 1064 | |
3bd1e081 MD |
1065 | unlink(consumer_data->err_unix_sock_path); |
1066 | unlink(consumer_data->cmd_unix_sock_path); | |
1067 | consumer_data->pid = 0; | |
1d4b027a | 1068 | |
5eb91c98 | 1069 | lttng_poll_clean(&events); |
0177d773 | 1070 | |
5eb91c98 | 1071 | return NULL; |
099e26bd DG |
1072 | } |
1073 | ||
099e26bd DG |
1074 | /* |
1075 | * This thread manage application communication. | |
1d4b027a DG |
1076 | */ |
1077 | static void *thread_manage_apps(void *data) | |
099e26bd | 1078 | { |
5eb91c98 DG |
1079 | int i, ret, pollfd; |
1080 | uint32_t revents, nb_fd; | |
099e26bd | 1081 | struct ust_command ust_cmd; |
5eb91c98 | 1082 | struct lttng_poll_event events; |
099e26bd DG |
1083 | |
1084 | DBG("[thread] Manage application started"); | |
1085 | ||
f6a9efaa DG |
1086 | rcu_register_thread(); |
1087 | rcu_thread_online(); | |
1088 | ||
5eb91c98 DG |
1089 | ret = create_thread_poll_set(&events, 2); |
1090 | if (ret < 0) { | |
1091 | goto error; | |
1092 | } | |
099e26bd | 1093 | |
5eb91c98 DG |
1094 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1095 | if (ret < 0) { | |
1096 | goto error; | |
1097 | } | |
099e26bd | 1098 | |
5eb91c98 DG |
1099 | while (1) { |
1100 | /* Zeroed the events structure */ | |
1101 | lttng_poll_reset(&events); | |
0177d773 | 1102 | |
5eb91c98 | 1103 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1104 | |
1105 | DBG("Apps thread polling on %d fds", nb_fd); | |
1106 | ||
1107 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1108 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1109 | if (ret < 0) { |
099e26bd DG |
1110 | goto error; |
1111 | } | |
1112 | ||
5eb91c98 DG |
1113 | for (i = 0; i < nb_fd; i++) { |
1114 | /* Fetch once the poll data */ | |
1115 | revents = LTTNG_POLL_GETEV(&events, i); | |
1116 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1117 | ||
1118 | /* Thread quit pipe has been closed. Killing thread. */ | |
1119 | ret = check_thread_quit_pipe(pollfd, revents); | |
1120 | if (ret) { | |
099e26bd | 1121 | goto error; |
5eb91c98 | 1122 | } |
099e26bd | 1123 | |
5eb91c98 DG |
1124 | /* Inspect the apps cmd pipe */ |
1125 | if (pollfd == apps_cmd_pipe[0]) { | |
1126 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1127 | ERR("Apps command pipe error"); | |
0177d773 | 1128 | goto error; |
5eb91c98 DG |
1129 | } else if (revents & LPOLLIN) { |
1130 | /* Empty pipe */ | |
1131 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1132 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1133 | perror("read apps cmd pipe"); | |
1134 | goto error; | |
1135 | } | |
099e26bd | 1136 | |
5eb91c98 | 1137 | /* Register applicaton to the session daemon */ |
56fff090 | 1138 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1139 | ust_cmd.sock); |
88ff5b7f | 1140 | if (ret == -ENOMEM) { |
5eb91c98 | 1141 | goto error; |
88ff5b7f MD |
1142 | } else if (ret < 0) { |
1143 | break; | |
5eb91c98 DG |
1144 | } |
1145 | ||
acc7b41b MD |
1146 | /* |
1147 | * Add channel(s) and event(s) to newly registered apps | |
1148 | * from lttng global UST domain. | |
1149 | */ | |
1150 | update_ust_app(ust_cmd.sock); | |
1151 | ||
f2ca2e25 | 1152 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1153 | if (ret < 0) { |
1154 | /* | |
1155 | * If the registration is not possible, we simply | |
1156 | * unregister the apps and continue | |
1157 | */ | |
56fff090 | 1158 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1159 | } else { |
1160 | /* | |
1161 | * We just need here to monitor the close of the UST | |
1162 | * socket and poll set monitor those by default. | |
1163 | */ | |
1164 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1165 | if (ret < 0) { | |
1166 | goto error; | |
1167 | } | |
1168 | ||
54d01ffb DG |
1169 | DBG("Apps with sock %d added to poll set", |
1170 | ust_cmd.sock); | |
5eb91c98 | 1171 | } |
487cf67c | 1172 | |
5eb91c98 | 1173 | break; |
0177d773 | 1174 | } |
5eb91c98 DG |
1175 | } else { |
1176 | /* | |
54d01ffb DG |
1177 | * At this point, we know that a registered application made |
1178 | * the event at poll_wait. | |
5eb91c98 DG |
1179 | */ |
1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1181 | /* Removing from the poll set */ | |
1182 | ret = lttng_poll_del(&events, pollfd); | |
1183 | if (ret < 0) { | |
1184 | goto error; | |
1185 | } | |
099e26bd | 1186 | |
b9d9b220 | 1187 | /* Socket closed on remote end. */ |
56fff090 | 1188 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1189 | break; |
1190 | } | |
099e26bd DG |
1191 | } |
1192 | } | |
099e26bd DG |
1193 | } |
1194 | ||
1195 | error: | |
1196 | DBG("Application communication apps dying"); | |
1197 | close(apps_cmd_pipe[0]); | |
1198 | close(apps_cmd_pipe[1]); | |
1199 | ||
5eb91c98 | 1200 | lttng_poll_clean(&events); |
099e26bd | 1201 | |
f6a9efaa DG |
1202 | rcu_thread_offline(); |
1203 | rcu_unregister_thread(); | |
099e26bd DG |
1204 | return NULL; |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Dispatch request from the registration threads to the application | |
1209 | * communication thread. | |
1210 | */ | |
1211 | static void *thread_dispatch_ust_registration(void *data) | |
1212 | { | |
1213 | int ret; | |
1214 | struct cds_wfq_node *node; | |
1215 | struct ust_command *ust_cmd = NULL; | |
1216 | ||
1217 | DBG("[thread] Dispatch UST command started"); | |
1218 | ||
1219 | while (!dispatch_thread_exit) { | |
1220 | /* Atomically prepare the queue futex */ | |
1221 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1222 | ||
1223 | do { | |
1224 | /* Dequeue command for registration */ | |
1225 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1226 | if (node == NULL) { | |
00a17c97 | 1227 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1228 | /* Continue thread execution */ |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1233 | ||
2f50c8a3 DG |
1234 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1235 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1236 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1237 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1238 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1239 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1240 | /* |
1241 | * Inform apps thread of the new application registration. This | |
1242 | * call is blocking so we can be assured that the data will be read | |
1243 | * at some point in time or wait to the end of the world :) | |
1244 | */ | |
1245 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1246 | sizeof(struct ust_command)); | |
1247 | if (ret < 0) { | |
1248 | perror("write apps cmd pipe"); | |
1249 | if (errno == EBADF) { | |
1250 | /* | |
1251 | * We can't inform the application thread to process | |
1252 | * registration. We will exit or else application | |
1253 | * registration will not occur and tracing will never | |
1254 | * start. | |
1255 | */ | |
1256 | goto error; | |
1257 | } | |
1258 | } | |
1259 | free(ust_cmd); | |
1260 | } while (node != NULL); | |
1261 | ||
1262 | /* Futex wait on queue. Blocking call on futex() */ | |
1263 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1264 | } | |
1265 | ||
1266 | error: | |
1267 | DBG("Dispatch thread dying"); | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * This thread manage application registration. | |
1273 | */ | |
1274 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1275 | { |
5eb91c98 DG |
1276 | int sock = 0, i, ret, pollfd; |
1277 | uint32_t revents, nb_fd; | |
1278 | struct lttng_poll_event events; | |
099e26bd DG |
1279 | /* |
1280 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1281 | * freed in the manage apps thread. | |
1282 | */ | |
1283 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1284 | |
099e26bd | 1285 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1286 | |
1287 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1288 | if (ret < 0) { | |
1289 | goto error; | |
1290 | } | |
1291 | ||
5eb91c98 DG |
1292 | /* |
1293 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1294 | * more will be added to this poll set. | |
1295 | */ | |
1296 | ret = create_thread_poll_set(&events, 2); | |
1297 | if (ret < 0) { | |
1298 | goto error; | |
1299 | } | |
273ea72c | 1300 | |
5eb91c98 DG |
1301 | /* Add the application registration socket */ |
1302 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1303 | if (ret < 0) { | |
1304 | goto error; | |
1305 | } | |
273ea72c | 1306 | |
1d4b027a | 1307 | /* Notify all applications to register */ |
0fdd1e2c DG |
1308 | ret = notify_ust_apps(1); |
1309 | if (ret < 0) { | |
1310 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1311 | "Execution continues but there might be problem for already\n" |
1312 | "running applications that wishes to register."); | |
0fdd1e2c | 1313 | } |
1d4b027a DG |
1314 | |
1315 | while (1) { | |
1316 | DBG("Accepting application registration"); | |
273ea72c | 1317 | |
5eb91c98 DG |
1318 | nb_fd = LTTNG_POLL_GETNB(&events); |
1319 | ||
273ea72c | 1320 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1321 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1322 | if (ret < 0) { |
273ea72c DG |
1323 | goto error; |
1324 | } | |
1325 | ||
5eb91c98 DG |
1326 | for (i = 0; i < nb_fd; i++) { |
1327 | /* Fetch once the poll data */ | |
1328 | revents = LTTNG_POLL_GETEV(&events, i); | |
1329 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1330 | |
5eb91c98 DG |
1331 | /* Thread quit pipe has been closed. Killing thread. */ |
1332 | ret = check_thread_quit_pipe(pollfd, revents); | |
1333 | if (ret) { | |
90014c57 DG |
1334 | goto error; |
1335 | } | |
1d4b027a | 1336 | |
5eb91c98 DG |
1337 | /* Event on the registration socket */ |
1338 | if (pollfd == apps_sock) { | |
1339 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1340 | ERR("Register apps socket poll error"); | |
1341 | goto error; | |
1342 | } else if (revents & LPOLLIN) { | |
1343 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1344 | if (sock < 0) { | |
1345 | goto error; | |
1346 | } | |
099e26bd | 1347 | |
5eb91c98 | 1348 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1349 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1350 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1351 | perror("ust command zmalloc"); |
5eb91c98 DG |
1352 | goto error; |
1353 | } | |
1d4b027a | 1354 | |
5eb91c98 DG |
1355 | /* |
1356 | * Using message-based transmissions to ensure we don't | |
1357 | * have to deal with partially received messages. | |
1358 | */ | |
1359 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1360 | sizeof(struct ust_register_msg)); | |
1361 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1362 | if (ret < 0) { | |
1363 | perror("lttcomm_recv_unix_sock register apps"); | |
1364 | } else { | |
1365 | ERR("Wrong size received on apps register"); | |
1366 | } | |
1367 | free(ust_cmd); | |
1368 | close(sock); | |
1369 | continue; | |
1370 | } | |
099e26bd | 1371 | |
5eb91c98 | 1372 | ust_cmd->sock = sock; |
099e26bd | 1373 | |
5eb91c98 DG |
1374 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1375 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1376 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1377 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1378 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1379 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1380 | |
5eb91c98 DG |
1381 | /* |
1382 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1383 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1384 | */ |
1385 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1386 | ||
1387 | /* | |
1388 | * Wake the registration queue futex. Implicit memory | |
1389 | * barrier with the exchange in cds_wfq_enqueue. | |
1390 | */ | |
1391 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1392 | } | |
1393 | } | |
90014c57 | 1394 | } |
1d4b027a DG |
1395 | } |
1396 | ||
1397 | error: | |
0fdd1e2c DG |
1398 | DBG("UST Registration thread dying"); |
1399 | ||
1400 | /* Notify that the registration thread is gone */ | |
1401 | notify_ust_apps(0); | |
1402 | ||
1403 | close(apps_sock); | |
1404 | close(sock); | |
273ea72c | 1405 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1406 | |
5eb91c98 DG |
1407 | lttng_poll_clean(&events); |
1408 | ||
1d4b027a DG |
1409 | return NULL; |
1410 | } | |
1411 | ||
8c0faa1d | 1412 | /* |
3bd1e081 | 1413 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1414 | * exec or it will fails. |
8c0faa1d | 1415 | */ |
3bd1e081 | 1416 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1417 | { |
1418 | int ret; | |
ee0b0061 DG |
1419 | struct timespec timeout; |
1420 | ||
1421 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1422 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1423 | |
1424 | /* Setup semaphore */ | |
3bd1e081 | 1425 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1426 | if (ret < 0) { |
3bd1e081 | 1427 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1428 | goto error; |
1429 | } | |
8c0faa1d | 1430 | |
3bd1e081 MD |
1431 | ret = pthread_create(&consumer_data->thread, NULL, |
1432 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1433 | if (ret != 0) { |
3bd1e081 | 1434 | PERROR("pthread_create consumer"); |
ee0b0061 | 1435 | ret = -1; |
8c0faa1d DG |
1436 | goto error; |
1437 | } | |
1438 | ||
ee0b0061 DG |
1439 | /* Get time for sem_timedwait absolute timeout */ |
1440 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1441 | if (ret < 0) { | |
3bd1e081 | 1442 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1443 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1444 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1445 | } else { |
1446 | /* Normal timeout if the gettime was successful */ | |
1447 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1448 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1449 | } |
8c0faa1d | 1450 | |
ee0b0061 DG |
1451 | if (ret < 0) { |
1452 | if (errno == ETIMEDOUT) { | |
1453 | /* | |
1454 | * Call has timed out so we kill the kconsumerd_thread and return | |
1455 | * an error. | |
1456 | */ | |
3bd1e081 MD |
1457 | ERR("The consumer thread was never ready. Killing it"); |
1458 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1459 | if (ret < 0) { |
3bd1e081 | 1460 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1461 | } |
1462 | } else { | |
3bd1e081 | 1463 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1464 | } |
1465 | goto error; | |
1466 | } | |
1467 | ||
3bd1e081 MD |
1468 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1469 | if (consumer_data->pid == 0) { | |
712ea556 | 1470 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1471 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1472 | goto error; |
1473 | } | |
3bd1e081 | 1474 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1475 | |
8c0faa1d DG |
1476 | return 0; |
1477 | ||
1478 | error: | |
1479 | return ret; | |
1480 | } | |
1481 | ||
d9800920 | 1482 | /* |
3bd1e081 | 1483 | * Join consumer thread |
d9800920 | 1484 | */ |
3bd1e081 | 1485 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1486 | { |
1487 | void *status; | |
1488 | int ret; | |
1489 | ||
3bd1e081 MD |
1490 | if (consumer_data->pid != 0) { |
1491 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1492 | if (ret) { |
3bd1e081 | 1493 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1494 | return ret; |
1495 | } | |
3bd1e081 | 1496 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1497 | } else { |
1498 | return 0; | |
1499 | } | |
1500 | } | |
1501 | ||
8c0faa1d | 1502 | /* |
3bd1e081 | 1503 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1504 | * |
d063d709 | 1505 | * Return pid if successful else -1. |
8c0faa1d | 1506 | */ |
3bd1e081 | 1507 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1508 | { |
1509 | int ret; | |
1510 | pid_t pid; | |
94c55f17 | 1511 | const char *consumer_to_use; |
53086306 | 1512 | const char *verbosity; |
94c55f17 | 1513 | struct stat st; |
8c0faa1d | 1514 | |
3bd1e081 | 1515 | DBG("Spawning consumerd"); |
c49dc785 | 1516 | |
8c0faa1d DG |
1517 | pid = fork(); |
1518 | if (pid == 0) { | |
1519 | /* | |
3bd1e081 | 1520 | * Exec consumerd. |
8c0faa1d | 1521 | */ |
daee5345 | 1522 | if (opt_verbose_consumer) { |
53086306 DG |
1523 | verbosity = "--verbose"; |
1524 | } else { | |
1525 | verbosity = "--quiet"; | |
1526 | } | |
3bd1e081 MD |
1527 | switch (consumer_data->type) { |
1528 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1529 | /* |
c7704d57 DG |
1530 | * Find out which consumerd to execute. We will first try the |
1531 | * 64-bit path, then the sessiond's installation directory, and | |
1532 | * fallback on the 32-bit one, | |
94c55f17 | 1533 | */ |
63a799e8 AM |
1534 | DBG3("Looking for a kernel consumer at these locations:"); |
1535 | DBG3(" 1) %s", consumerd64_bin); | |
1536 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1537 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1538 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1539 | DBG3("Found location #1"); |
94c55f17 | 1540 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1541 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1542 | DBG3("Found location #2"); |
94c55f17 | 1543 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1544 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1545 | DBG3("Found location #3"); |
eb1e0bd4 | 1546 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1547 | } else { |
63a799e8 | 1548 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1549 | break; |
1550 | } | |
1551 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1552 | execl(consumer_to_use, | |
1553 | "lttng-consumerd", verbosity, "-k", | |
1554 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1555 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1556 | NULL); | |
3bd1e081 | 1557 | break; |
7753dea8 MD |
1558 | case LTTNG_CONSUMER64_UST: |
1559 | { | |
b1e0b6b6 | 1560 | char *tmpnew = NULL; |
8f4905da MD |
1561 | |
1562 | if (consumerd64_libdir[0] != '\0') { | |
1563 | char *tmp; | |
1564 | size_t tmplen; | |
1565 | ||
1566 | tmp = getenv("LD_LIBRARY_PATH"); | |
1567 | if (!tmp) { | |
1568 | tmp = ""; | |
1569 | } | |
1570 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1571 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1572 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1573 | if (!tmpnew) { | |
1574 | ret = -ENOMEM; | |
1575 | goto error; | |
1576 | } | |
1577 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1578 | strcat(tmpnew, consumerd64_libdir); | |
1579 | if (tmp[0] != '\0') { | |
1580 | strcat(tmpnew, ":"); | |
1581 | strcat(tmpnew, tmp); | |
1582 | } | |
1583 | ret = putenv(tmpnew); | |
1584 | if (ret) { | |
1585 | ret = -errno; | |
1586 | goto error; | |
1587 | } | |
1588 | } | |
94c55f17 | 1589 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1590 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1591 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1592 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1593 | NULL); | |
8f4905da MD |
1594 | if (consumerd64_libdir[0] != '\0') { |
1595 | free(tmpnew); | |
1596 | } | |
1597 | if (ret) { | |
1598 | goto error; | |
1599 | } | |
3bd1e081 | 1600 | break; |
7753dea8 MD |
1601 | } |
1602 | case LTTNG_CONSUMER32_UST: | |
1603 | { | |
937dde8e | 1604 | char *tmpnew = NULL; |
8f4905da MD |
1605 | |
1606 | if (consumerd32_libdir[0] != '\0') { | |
1607 | char *tmp; | |
1608 | size_t tmplen; | |
1609 | ||
1610 | tmp = getenv("LD_LIBRARY_PATH"); | |
1611 | if (!tmp) { | |
1612 | tmp = ""; | |
1613 | } | |
1614 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1615 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1616 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1617 | if (!tmpnew) { | |
1618 | ret = -ENOMEM; | |
1619 | goto error; | |
1620 | } | |
1621 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1622 | strcat(tmpnew, consumerd32_libdir); | |
1623 | if (tmp[0] != '\0') { | |
1624 | strcat(tmpnew, ":"); | |
1625 | strcat(tmpnew, tmp); | |
1626 | } | |
1627 | ret = putenv(tmpnew); | |
1628 | if (ret) { | |
1629 | ret = -errno; | |
1630 | goto error; | |
1631 | } | |
1632 | } | |
94c55f17 | 1633 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1634 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1635 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1636 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1637 | NULL); | |
8f4905da MD |
1638 | if (consumerd32_libdir[0] != '\0') { |
1639 | free(tmpnew); | |
1640 | } | |
1641 | if (ret) { | |
1642 | goto error; | |
1643 | } | |
7753dea8 MD |
1644 | break; |
1645 | } | |
3bd1e081 MD |
1646 | default: |
1647 | perror("unknown consumer type"); | |
1648 | exit(EXIT_FAILURE); | |
1649 | } | |
8c0faa1d DG |
1650 | if (errno != 0) { |
1651 | perror("kernel start consumer exec"); | |
1652 | } | |
1653 | exit(EXIT_FAILURE); | |
1654 | } else if (pid > 0) { | |
1655 | ret = pid; | |
8c0faa1d | 1656 | } else { |
3bd1e081 | 1657 | perror("start consumer fork"); |
8c0faa1d | 1658 | ret = -errno; |
8c0faa1d | 1659 | } |
8f4905da | 1660 | error: |
8c0faa1d DG |
1661 | return ret; |
1662 | } | |
1663 | ||
693bd40b | 1664 | /* |
3bd1e081 | 1665 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1666 | */ |
3bd1e081 | 1667 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1668 | { |
1669 | int ret; | |
1670 | ||
3bd1e081 MD |
1671 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1672 | if (consumer_data->pid != 0) { | |
1673 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1674 | goto end; |
1675 | } | |
693bd40b | 1676 | |
3bd1e081 | 1677 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1678 | if (ret < 0) { |
3bd1e081 MD |
1679 | ERR("Spawning consumerd failed"); |
1680 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1681 | goto error; |
693bd40b | 1682 | } |
c49dc785 | 1683 | |
3bd1e081 MD |
1684 | /* Setting up the consumer_data pid */ |
1685 | consumer_data->pid = ret; | |
48842b30 | 1686 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1687 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1688 | |
3bd1e081 MD |
1689 | DBG2("Spawning consumer control thread"); |
1690 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1691 | if (ret < 0) { |
3bd1e081 | 1692 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1693 | goto error; |
1694 | } | |
1695 | ||
c49dc785 | 1696 | end: |
693bd40b DG |
1697 | return 0; |
1698 | ||
1699 | error: | |
1700 | return ret; | |
1701 | } | |
1702 | ||
b73401da | 1703 | /* |
d063d709 | 1704 | * modprobe_kernel_modules |
b73401da DG |
1705 | */ |
1706 | static int modprobe_kernel_modules(void) | |
1707 | { | |
ab147185 | 1708 | int ret = 0, i; |
b73401da DG |
1709 | char modprobe[256]; |
1710 | ||
ab147185 MD |
1711 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1712 | ret = snprintf(modprobe, sizeof(modprobe), | |
1713 | "/sbin/modprobe %s%s", | |
24b487b8 | 1714 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1715 | kernel_modules_list[i].name); |
b73401da DG |
1716 | if (ret < 0) { |
1717 | perror("snprintf modprobe"); | |
1718 | goto error; | |
1719 | } | |
ab147185 | 1720 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1721 | ret = system(modprobe); |
ab147185 MD |
1722 | if (ret == -1) { |
1723 | ERR("Unable to launch modprobe for module %s", | |
1724 | kernel_modules_list[i].name); | |
1725 | } else if (kernel_modules_list[i].required | |
d9800920 | 1726 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1727 | ERR("Unable to load module %s", |
1728 | kernel_modules_list[i].name); | |
1729 | } else { | |
1730 | DBG("Modprobe successfully %s", | |
1731 | kernel_modules_list[i].name); | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | error: | |
1736 | return ret; | |
1737 | } | |
1738 | ||
b73401da | 1739 | /* |
d063d709 | 1740 | * mount_debugfs |
b73401da DG |
1741 | */ |
1742 | static int mount_debugfs(char *path) | |
1743 | { | |
1744 | int ret; | |
1745 | char *type = "debugfs"; | |
1746 | ||
e11d277b | 1747 | ret = run_as_mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1748 | if (ret < 0) { |
7272acf5 | 1749 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1750 | goto error; |
1751 | } | |
1752 | ||
1753 | ret = mount(type, path, type, 0, NULL); | |
1754 | if (ret < 0) { | |
7272acf5 | 1755 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1756 | goto error; |
1757 | } | |
1758 | ||
1759 | DBG("Mounted debugfs successfully at %s", path); | |
1760 | ||
1761 | error: | |
1762 | return ret; | |
1763 | } | |
1764 | ||
8c0faa1d | 1765 | /* |
d063d709 | 1766 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1767 | */ |
f3ed775e | 1768 | static void init_kernel_tracer(void) |
8c0faa1d | 1769 | { |
b73401da DG |
1770 | int ret; |
1771 | char *proc_mounts = "/proc/mounts"; | |
1772 | char line[256]; | |
684d34d2 | 1773 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1774 | FILE *fp; |
1775 | ||
1776 | /* Detect debugfs */ | |
1777 | fp = fopen(proc_mounts, "r"); | |
1778 | if (fp == NULL) { | |
1779 | ERR("Unable to probe %s", proc_mounts); | |
1780 | goto error; | |
1781 | } | |
1782 | ||
1783 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1784 | if (strstr(line, "debugfs") != NULL) { | |
1785 | /* Remove first string */ | |
1786 | strtok(line, " "); | |
1787 | /* Dup string here so we can reuse line later on */ | |
1788 | debugfs_path = strdup(strtok(NULL, " ")); | |
1789 | DBG("Got debugfs path : %s", debugfs_path); | |
1790 | break; | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | fclose(fp); | |
1795 | ||
1796 | /* Mount debugfs if needded */ | |
1797 | if (debugfs_path == NULL) { | |
1798 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1799 | if (ret < 0) { | |
1800 | perror("asprintf debugfs path"); | |
1801 | goto error; | |
1802 | } | |
1803 | ret = mount_debugfs(debugfs_path); | |
1804 | if (ret < 0) { | |
7272acf5 | 1805 | perror("Cannot mount debugfs"); |
b73401da DG |
1806 | goto error; |
1807 | } | |
1808 | } | |
1809 | ||
1810 | /* Modprobe lttng kernel modules */ | |
1811 | ret = modprobe_kernel_modules(); | |
1812 | if (ret < 0) { | |
1813 | goto error; | |
1814 | } | |
1815 | ||
1816 | /* Setup lttng kernel path */ | |
1817 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1818 | if (ret < 0) { | |
1819 | perror("asprintf lttng path"); | |
1820 | goto error; | |
1821 | } | |
1822 | ||
1823 | /* Open debugfs lttng */ | |
1824 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1825 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1826 | DBG("Failed to open %s", lttng_path); |
1827 | goto error; | |
8c0faa1d DG |
1828 | } |
1829 | ||
b73401da DG |
1830 | free(lttng_path); |
1831 | free(debugfs_path); | |
f3ed775e | 1832 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1833 | return; |
1834 | ||
1835 | error: | |
1836 | if (lttng_path) { | |
1837 | free(lttng_path); | |
1838 | } | |
1839 | if (debugfs_path) { | |
1840 | free(debugfs_path); | |
1841 | } | |
1842 | WARN("No kernel tracer available"); | |
1843 | kernel_tracer_fd = 0; | |
1844 | return; | |
f3ed775e | 1845 | } |
33a2b854 | 1846 | |
f3ed775e | 1847 | /* |
54d01ffb | 1848 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1849 | */ |
54d01ffb | 1850 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1851 | { |
f40799e8 | 1852 | int ret = 0; |
8c0faa1d | 1853 | |
3bd1e081 | 1854 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1855 | /* |
54d01ffb DG |
1856 | * Assign default kernel consumer socket if no consumer assigned to the |
1857 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1858 | * an extra security check. | |
d9800920 DG |
1859 | */ |
1860 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1861 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1862 | } |
1863 | ||
2bdd86d4 | 1864 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1865 | if (ret < 0) { |
f3ed775e DG |
1866 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1867 | goto error; | |
1868 | } | |
1d4b027a | 1869 | |
3bd1e081 | 1870 | session->consumer_fds_sent = 1; |
f3ed775e | 1871 | } |
1d4b027a DG |
1872 | |
1873 | error: | |
1874 | return ret; | |
8c0faa1d DG |
1875 | } |
1876 | ||
0177d773 DG |
1877 | /* |
1878 | * Create an UST session and add it to the session ust list. | |
1879 | */ | |
44d3bd01 | 1880 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1881 | struct lttng_domain *domain) |
0177d773 | 1882 | { |
13384287 | 1883 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1884 | int ret; |
44d3bd01 DG |
1885 | |
1886 | switch (domain->type) { | |
48842b30 | 1887 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1888 | break; |
1889 | default: | |
13384287 | 1890 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1891 | goto error; |
1892 | } | |
0177d773 DG |
1893 | |
1894 | DBG("Creating UST session"); | |
1895 | ||
a991f516 | 1896 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1897 | if (lus == NULL) { |
44d3bd01 | 1898 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1899 | goto error; |
1900 | } | |
1901 | ||
e11d277b | 1902 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1903 | session->uid, session->gid); |
0177d773 DG |
1904 | if (ret < 0) { |
1905 | if (ret != -EEXIST) { | |
1906 | ERR("Trace directory creation error"); | |
44d3bd01 | 1907 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1908 | goto error; |
1909 | } | |
1910 | } | |
1911 | ||
f6a9efaa DG |
1912 | /* The domain type dictate different actions on session creation */ |
1913 | switch (domain->type) { | |
48842b30 DG |
1914 | case LTTNG_DOMAIN_UST: |
1915 | /* No ustctl for the global UST domain */ | |
1916 | break; | |
1917 | default: | |
36dc12cc | 1918 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1919 | goto error; |
0177d773 | 1920 | } |
6df2e2c9 MD |
1921 | lus->uid = session->uid; |
1922 | lus->gid = session->gid; | |
f6a9efaa | 1923 | session->ust_session = lus; |
44d3bd01 DG |
1924 | |
1925 | return LTTCOMM_OK; | |
0177d773 DG |
1926 | |
1927 | error: | |
1928 | free(lus); | |
1929 | return ret; | |
1930 | } | |
1931 | ||
333f285e | 1932 | /* |
d063d709 | 1933 | * Create a kernel tracer session then create the default channel. |
333f285e | 1934 | */ |
6df2e2c9 | 1935 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1936 | { |
f3ed775e | 1937 | int ret; |
f3ed775e DG |
1938 | |
1939 | DBG("Creating kernel session"); | |
1940 | ||
1941 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1942 | if (ret < 0) { | |
1943 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1944 | goto error; | |
333f285e DG |
1945 | } |
1946 | ||
d9800920 | 1947 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1948 | if (kconsumer_data.cmd_sock) { |
1949 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1950 | } |
1951 | ||
e11d277b | 1952 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1953 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1954 | if (ret < 0) { |
996b65c8 | 1955 | if (ret != -EEXIST) { |
7a485870 DG |
1956 | ERR("Trace directory creation error"); |
1957 | goto error; | |
1958 | } | |
1959 | } | |
6df2e2c9 MD |
1960 | session->kernel_session->uid = session->uid; |
1961 | session->kernel_session->gid = session->gid; | |
7a485870 | 1962 | |
f3ed775e DG |
1963 | error: |
1964 | return ret; | |
333f285e DG |
1965 | } |
1966 | ||
8e0af1b4 | 1967 | /* |
c7704d57 DG |
1968 | * Check if the UID or GID match the session. Root user has access to all |
1969 | * sessions. | |
8e0af1b4 | 1970 | */ |
c7704d57 | 1971 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1972 | { |
c7704d57 | 1973 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
1974 | return 0; |
1975 | } else { | |
1976 | return 1; | |
1977 | } | |
1978 | } | |
1979 | ||
1980 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1981 | { | |
1982 | unsigned int i = 0; | |
1983 | struct ltt_session *session; | |
1984 | ||
1985 | DBG("Counting number of available session for UID %d GID %d", | |
1986 | uid, gid); | |
1987 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1988 | /* | |
1989 | * Only list the sessions the user can control. | |
1990 | */ | |
1991 | if (!session_access_ok(session, uid, gid)) { | |
1992 | continue; | |
1993 | } | |
1994 | i++; | |
1995 | } | |
1996 | return i; | |
1997 | } | |
1998 | ||
6c9cc2ab DG |
1999 | /* |
2000 | * Using the session list, filled a lttng_session array to send back to the | |
2001 | * client for session listing. | |
2002 | * | |
2003 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2004 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2005 | */ |
c7704d57 DG |
2006 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2007 | gid_t gid) | |
6c9cc2ab | 2008 | { |
8e0af1b4 | 2009 | unsigned int i = 0; |
6c9cc2ab DG |
2010 | struct ltt_session *session; |
2011 | ||
8e0af1b4 MD |
2012 | DBG("Getting all available session for UID %d GID %d", |
2013 | uid, gid); | |
6c9cc2ab DG |
2014 | /* |
2015 | * Iterate over session list and append data after the control struct in | |
2016 | * the buffer. | |
2017 | */ | |
2018 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2019 | /* |
2020 | * Only list the sessions the user can control. | |
2021 | */ | |
2022 | if (!session_access_ok(session, uid, gid)) { | |
2023 | continue; | |
2024 | } | |
6c9cc2ab | 2025 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2026 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2027 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2028 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2029 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2030 | i++; |
2031 | } | |
2032 | } | |
2033 | ||
9f19cc17 DG |
2034 | /* |
2035 | * Fill lttng_channel array of all channels. | |
2036 | */ | |
b551a063 | 2037 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2038 | struct lttng_channel *channels) |
2039 | { | |
2040 | int i = 0; | |
2041 | struct ltt_kernel_channel *kchan; | |
2042 | ||
2043 | DBG("Listing channels for session %s", session->name); | |
2044 | ||
b551a063 DG |
2045 | switch (domain) { |
2046 | case LTTNG_DOMAIN_KERNEL: | |
2047 | /* Kernel channels */ | |
2048 | if (session->kernel_session != NULL) { | |
2049 | cds_list_for_each_entry(kchan, | |
2050 | &session->kernel_session->channel_list.head, list) { | |
2051 | /* Copy lttng_channel struct to array */ | |
2052 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2053 | channels[i].enabled = kchan->enabled; | |
2054 | i++; | |
2055 | } | |
2056 | } | |
2057 | break; | |
2058 | case LTTNG_DOMAIN_UST: | |
2059 | { | |
bec39940 | 2060 | struct lttng_ht_iter iter; |
b551a063 DG |
2061 | struct ltt_ust_channel *uchan; |
2062 | ||
bec39940 DG |
2063 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2064 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2065 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2066 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2067 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2068 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2069 | channels[i].attr.switch_timer_interval = | |
2070 | uchan->attr.switch_timer_interval; | |
2071 | channels[i].attr.read_timer_interval = | |
2072 | uchan->attr.read_timer_interval; | |
aea829b3 | 2073 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2074 | switch (uchan->attr.output) { |
2075 | case LTTNG_UST_MMAP: | |
2076 | default: | |
2077 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2078 | break; | |
2079 | } | |
befe0905 | 2080 | i++; |
b551a063 DG |
2081 | } |
2082 | break; | |
2083 | } | |
2084 | default: | |
2085 | break; | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | /* | |
2090 | * Create a list of ust global domain events. | |
2091 | */ | |
2092 | static int list_lttng_ust_global_events(char *channel_name, | |
2093 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2094 | { | |
2095 | int i = 0, ret = 0; | |
2096 | unsigned int nb_event = 0; | |
bec39940 DG |
2097 | struct lttng_ht_iter iter; |
2098 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2099 | struct ltt_ust_channel *uchan; |
2100 | struct ltt_ust_event *uevent; | |
2101 | struct lttng_event *tmp; | |
2102 | ||
2103 | DBG("Listing UST global events for channel %s", channel_name); | |
2104 | ||
2105 | rcu_read_lock(); | |
2106 | ||
bec39940 DG |
2107 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2108 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2109 | if (node == NULL) { |
2110 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2111 | goto error; | |
b551a063 DG |
2112 | } |
2113 | ||
bec39940 | 2114 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2115 | |
bec39940 | 2116 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2117 | |
b551a063 DG |
2118 | if (nb_event == 0) { |
2119 | ret = nb_event; | |
2120 | goto error; | |
2121 | } | |
2122 | ||
2123 | DBG3("Listing UST global %d events", nb_event); | |
2124 | ||
2125 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2126 | if (tmp == NULL) { | |
2127 | ret = -LTTCOMM_FATAL; | |
2128 | goto error; | |
2129 | } | |
2130 | ||
bec39940 | 2131 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2132 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2133 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2134 | tmp[i].enabled = uevent->enabled; | |
2135 | switch (uevent->attr.instrumentation) { | |
2136 | case LTTNG_UST_TRACEPOINT: | |
2137 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2138 | break; | |
2139 | case LTTNG_UST_PROBE: | |
2140 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2141 | break; | |
2142 | case LTTNG_UST_FUNCTION: | |
2143 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2144 | break; | |
ac3bd9c0 | 2145 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2146 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2147 | break; |
9f19cc17 | 2148 | } |
d7b75b30 | 2149 | i++; |
9f19cc17 DG |
2150 | } |
2151 | ||
b551a063 DG |
2152 | ret = nb_event; |
2153 | *events = tmp; | |
2154 | ||
2155 | error: | |
2156 | rcu_read_unlock(); | |
2157 | return ret; | |
9f19cc17 DG |
2158 | } |
2159 | ||
2160 | /* | |
b551a063 | 2161 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2162 | */ |
b551a063 DG |
2163 | static int list_lttng_kernel_events(char *channel_name, |
2164 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2165 | { |
b551a063 DG |
2166 | int i = 0, ret; |
2167 | unsigned int nb_event; | |
9f19cc17 | 2168 | struct ltt_kernel_event *event; |
b551a063 DG |
2169 | struct ltt_kernel_channel *kchan; |
2170 | ||
2171 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2172 | if (kchan == NULL) { | |
2173 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2174 | goto error; | |
2175 | } | |
2176 | ||
2177 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2178 | |
2179 | DBG("Listing events for channel %s", kchan->channel->name); | |
2180 | ||
b551a063 DG |
2181 | if (nb_event == 0) { |
2182 | ret = nb_event; | |
2183 | goto error; | |
2184 | } | |
2185 | ||
2186 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2187 | if (*events == NULL) { | |
2188 | ret = LTTCOMM_FATAL; | |
2189 | goto error; | |
2190 | } | |
2191 | ||
9f19cc17 DG |
2192 | /* Kernel channels */ |
2193 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2194 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2195 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2196 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2197 | switch (event->event->instrumentation) { |
2198 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2199 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2200 | break; |
2201 | case LTTNG_KERNEL_KPROBE: | |
2202 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2203 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2204 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2205 | sizeof(struct lttng_kernel_kprobe)); |
2206 | break; | |
2207 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2208 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2209 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2210 | sizeof(struct lttng_kernel_function)); |
2211 | break; | |
0133c199 | 2212 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2213 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2214 | break; |
a54bd42d | 2215 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2216 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2217 | break; |
7a3d1328 MD |
2218 | case LTTNG_KERNEL_ALL: |
2219 | assert(0); | |
2220 | break; | |
9f19cc17 DG |
2221 | } |
2222 | i++; | |
2223 | } | |
b551a063 DG |
2224 | |
2225 | return nb_event; | |
2226 | ||
2227 | error: | |
2228 | return ret; | |
9f19cc17 DG |
2229 | } |
2230 | ||
fac6795d | 2231 | /* |
54d01ffb | 2232 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2233 | */ |
54d01ffb DG |
2234 | static int cmd_disable_channel(struct ltt_session *session, |
2235 | int domain, char *channel_name) | |
fac6795d | 2236 | { |
54d01ffb | 2237 | int ret; |
78f0bacd DG |
2238 | struct ltt_ust_session *usess; |
2239 | ||
2240 | usess = session->ust_session; | |
379473d2 | 2241 | |
54d01ffb | 2242 | switch (domain) { |
78f0bacd DG |
2243 | case LTTNG_DOMAIN_KERNEL: |
2244 | { | |
2245 | ret = channel_kernel_disable(session->kernel_session, | |
2246 | channel_name); | |
2247 | if (ret != LTTCOMM_OK) { | |
2248 | goto error; | |
2249 | } | |
54d01ffb | 2250 | |
78f0bacd DG |
2251 | kernel_wait_quiescent(kernel_tracer_fd); |
2252 | break; | |
2253 | } | |
2254 | case LTTNG_DOMAIN_UST: | |
2255 | { | |
2256 | struct ltt_ust_channel *uchan; | |
bec39940 | 2257 | struct lttng_ht *chan_ht; |
78f0bacd | 2258 | |
7885e399 DG |
2259 | chan_ht = usess->domain_global.channels; |
2260 | ||
2261 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2262 | if (uchan == NULL) { |
2263 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2264 | goto error; |
78f0bacd DG |
2265 | } |
2266 | ||
7885e399 DG |
2267 | ret = channel_ust_disable(usess, domain, uchan); |
2268 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2269 | goto error; |
2270 | } | |
78f0bacd DG |
2271 | break; |
2272 | } | |
2273 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2274 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2275 | case LTTNG_DOMAIN_UST_PID: | |
2276 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2277 | goto error; | |
2278 | default: | |
2279 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2280 | goto error; | |
20fe2104 DG |
2281 | } |
2282 | ||
54d01ffb | 2283 | ret = LTTCOMM_OK; |
d65106b1 | 2284 | |
54d01ffb DG |
2285 | error: |
2286 | return ret; | |
2287 | } | |
2288 | ||
2289 | /* | |
2290 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2291 | */ | |
44d3bd01 | 2292 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2293 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2294 | { |
2295 | int ret; | |
f6a9efaa | 2296 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2297 | struct lttng_ht *chan_ht; |
f6a9efaa | 2298 | |
5d56b5aa | 2299 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2300 | |
aea829b3 | 2301 | switch (domain) { |
44d3bd01 DG |
2302 | case LTTNG_DOMAIN_KERNEL: |
2303 | { | |
2304 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2305 | |
44d3bd01 DG |
2306 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2307 | session->kernel_session); | |
2308 | if (kchan == NULL) { | |
2309 | ret = channel_kernel_create(session->kernel_session, | |
2310 | attr, kernel_poll_pipe[1]); | |
2311 | } else { | |
2312 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2313 | } | |
2314 | ||
2315 | if (ret != LTTCOMM_OK) { | |
2316 | goto error; | |
2317 | } | |
2318 | ||
2319 | kernel_wait_quiescent(kernel_tracer_fd); | |
2320 | break; | |
2321 | } | |
f6a9efaa DG |
2322 | case LTTNG_DOMAIN_UST: |
2323 | { | |
2324 | struct ltt_ust_channel *uchan; | |
2325 | ||
7885e399 | 2326 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2327 | |
7885e399 | 2328 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2329 | if (uchan == NULL) { |
7885e399 | 2330 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2331 | } else { |
7885e399 | 2332 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2333 | } |
f6a9efaa DG |
2334 | break; |
2335 | } | |
78f0bacd DG |
2336 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2337 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2338 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2339 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2340 | goto error; | |
44d3bd01 DG |
2341 | default: |
2342 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2343 | goto error; | |
54d01ffb DG |
2344 | } |
2345 | ||
54d01ffb DG |
2346 | error: |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | /* | |
2351 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2352 | */ | |
2353 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2354 | char *channel_name, char *event_name) | |
2355 | { | |
2356 | int ret; | |
54d01ffb DG |
2357 | |
2358 | switch (domain) { | |
2359 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2360 | { |
2361 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2362 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2363 | |
b0a40d28 DG |
2364 | ksess = session->kernel_session; |
2365 | ||
2366 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2367 | if (kchan == NULL) { |
2368 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2369 | goto error; | |
d65106b1 DG |
2370 | } |
2371 | ||
b0a40d28 | 2372 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2373 | if (ret != LTTCOMM_OK) { |
2374 | goto error; | |
2375 | } | |
2376 | ||
2377 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2378 | break; |
2bdd86d4 MD |
2379 | } |
2380 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2381 | { |
b0a40d28 | 2382 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2383 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2384 | |
2385 | usess = session->ust_session; | |
2386 | ||
2387 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2388 | channel_name); | |
2389 | if (uchan == NULL) { | |
2390 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2391 | goto error; | |
2392 | } | |
2393 | ||
7f79d3a1 DG |
2394 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2395 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2396 | goto error; |
2397 | } | |
2398 | ||
7f79d3a1 | 2399 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2400 | channel_name); |
b0a40d28 DG |
2401 | break; |
2402 | } | |
2bdd86d4 MD |
2403 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2404 | case LTTNG_DOMAIN_UST_PID: | |
2405 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2406 | default: |
54d01ffb DG |
2407 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2408 | goto error; | |
d65106b1 | 2409 | } |
26cc6b4e | 2410 | |
54d01ffb DG |
2411 | ret = LTTCOMM_OK; |
2412 | ||
2413 | error: | |
2414 | return ret; | |
2415 | } | |
2416 | ||
2417 | /* | |
2418 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2419 | */ | |
2420 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2421 | char *channel_name) | |
2422 | { | |
2423 | int ret; | |
54d01ffb DG |
2424 | |
2425 | switch (domain) { | |
2426 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2427 | { |
2428 | struct ltt_kernel_session *ksess; | |
2429 | struct ltt_kernel_channel *kchan; | |
2430 | ||
2431 | ksess = session->kernel_session; | |
2432 | ||
2433 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2434 | if (kchan == NULL) { |
2435 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2436 | goto error; | |
26cc6b4e DG |
2437 | } |
2438 | ||
9730260e | 2439 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2440 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2441 | goto error; |
26cc6b4e DG |
2442 | } |
2443 | ||
54d01ffb | 2444 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2445 | break; |
9730260e DG |
2446 | } |
2447 | case LTTNG_DOMAIN_UST: | |
2448 | { | |
2449 | struct ltt_ust_session *usess; | |
2450 | struct ltt_ust_channel *uchan; | |
2451 | ||
2452 | usess = session->ust_session; | |
2453 | ||
2454 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2455 | channel_name); | |
2456 | if (uchan == NULL) { | |
2457 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2458 | goto error; | |
2459 | } | |
2460 | ||
7f79d3a1 DG |
2461 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2462 | if (ret != 0) { | |
9730260e DG |
2463 | goto error; |
2464 | } | |
2465 | ||
7f79d3a1 | 2466 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2467 | |
2468 | break; | |
2469 | } | |
2470 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2471 | case LTTNG_DOMAIN_UST_PID: | |
2472 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2473 | default: |
54d01ffb DG |
2474 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2475 | goto error; | |
26cc6b4e | 2476 | } |
e953ef25 | 2477 | |
54d01ffb | 2478 | ret = LTTCOMM_OK; |
e953ef25 | 2479 | |
54d01ffb DG |
2480 | error: |
2481 | return ret; | |
2482 | } | |
f5177a38 | 2483 | |
54d01ffb DG |
2484 | /* |
2485 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2486 | */ | |
2487 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2488 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2489 | { | |
2490 | int ret; | |
f5177a38 | 2491 | |
54d01ffb DG |
2492 | switch (domain) { |
2493 | case LTTNG_DOMAIN_KERNEL: | |
2494 | /* Add kernel context to kernel tracer */ | |
2495 | ret = context_kernel_add(session->kernel_session, ctx, | |
2496 | event_name, channel_name); | |
2497 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2498 | goto error; |
e953ef25 | 2499 | } |
2bdd86d4 MD |
2500 | break; |
2501 | case LTTNG_DOMAIN_UST: | |
2502 | { | |
55cc08a6 | 2503 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2504 | |
55cc08a6 DG |
2505 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2506 | if (ret != LTTCOMM_OK) { | |
2507 | goto error; | |
2bdd86d4 | 2508 | } |
e953ef25 | 2509 | break; |
2bdd86d4 | 2510 | } |
55cc08a6 DG |
2511 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2512 | case LTTNG_DOMAIN_UST_PID: | |
2513 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2514 | default: |
54d01ffb DG |
2515 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2516 | goto error; | |
e953ef25 | 2517 | } |
950131af | 2518 | |
54d01ffb | 2519 | ret = LTTCOMM_OK; |
950131af | 2520 | |
54d01ffb DG |
2521 | error: |
2522 | return ret; | |
2523 | } | |
2524 | ||
2525 | /* | |
2526 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2527 | * |
2528 | * TODO: currently, both events and loglevels are kept within the same | |
2529 | * namespace for UST global registry/app registery, so if an event | |
2530 | * happen to have the same name as the loglevel (very unlikely though), | |
2531 | * and an attempt is made to enable/disable both in the same session, | |
2532 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2533 | */ |
2534 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2535 | char *channel_name, struct lttng_event *event) | |
2536 | { | |
2537 | int ret; | |
f6cd6b0f | 2538 | struct lttng_channel *attr; |
48842b30 | 2539 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2540 | |
2541 | switch (domain) { | |
2542 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2543 | { |
2544 | struct ltt_kernel_channel *kchan; | |
2545 | ||
54d01ffb DG |
2546 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2547 | session->kernel_session); | |
2548 | if (kchan == NULL) { | |
f6cd6b0f DG |
2549 | attr = channel_new_default_attr(domain); |
2550 | if (attr == NULL) { | |
2551 | ret = LTTCOMM_FATAL; | |
2552 | goto error; | |
2553 | } | |
2554 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2555 | ||
54d01ffb | 2556 | /* This call will notify the kernel thread */ |
44d3bd01 | 2557 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2558 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2559 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2560 | free(attr); |
f5177a38 DG |
2561 | goto error; |
2562 | } | |
ff4d74e6 | 2563 | free(attr); |
54d01ffb | 2564 | } |
950131af | 2565 | |
54d01ffb DG |
2566 | /* Get the newly created kernel channel pointer */ |
2567 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2568 | session->kernel_session); | |
2569 | if (kchan == NULL) { | |
2570 | /* This sould not happen... */ | |
2571 | ret = LTTCOMM_FATAL; | |
2572 | goto error; | |
2573 | } | |
f5177a38 | 2574 | |
48842b30 DG |
2575 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2576 | event); | |
54d01ffb | 2577 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2578 | goto error; |
950131af DG |
2579 | } |
2580 | ||
54d01ffb | 2581 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2582 | break; |
2bdd86d4 MD |
2583 | } |
2584 | case LTTNG_DOMAIN_UST: | |
2585 | { | |
aea829b3 | 2586 | struct lttng_channel *attr; |
edb67388 | 2587 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2588 | |
edb67388 | 2589 | /* Get channel from global UST domain */ |
48842b30 DG |
2590 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2591 | channel_name); | |
2592 | if (uchan == NULL) { | |
aea829b3 DG |
2593 | /* Create default channel */ |
2594 | attr = channel_new_default_attr(domain); | |
2595 | if (attr == NULL) { | |
2596 | ret = LTTCOMM_FATAL; | |
2597 | goto error; | |
2598 | } | |
596219f7 | 2599 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2600 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2601 | |
7885e399 | 2602 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2603 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2604 | free(attr); |
aea829b3 DG |
2605 | goto error; |
2606 | } | |
aea829b3 DG |
2607 | free(attr); |
2608 | ||
2609 | /* Get the newly created channel reference back */ | |
2610 | uchan = trace_ust_find_channel_by_name( | |
2611 | usess->domain_global.channels, channel_name); | |
2612 | if (uchan == NULL) { | |
2613 | /* Something is really wrong */ | |
2614 | ret = LTTCOMM_FATAL; | |
2615 | goto error; | |
2616 | } | |
48842b30 | 2617 | } |
2bdd86d4 | 2618 | |
edb67388 | 2619 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2620 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2621 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2622 | goto error; |
2bdd86d4 MD |
2623 | } |
2624 | break; | |
2625 | } | |
2626 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2627 | case LTTNG_DOMAIN_UST_PID: | |
2628 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2629 | default: |
54d01ffb DG |
2630 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2631 | goto error; | |
950131af | 2632 | } |
d36b8583 | 2633 | |
54d01ffb | 2634 | ret = LTTCOMM_OK; |
d36b8583 | 2635 | |
54d01ffb DG |
2636 | error: |
2637 | return ret; | |
2638 | } | |
7d29a247 | 2639 | |
54d01ffb DG |
2640 | /* |
2641 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2642 | */ | |
2643 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2644 | char *channel_name, int event_type) |
54d01ffb DG |
2645 | { |
2646 | int ret; | |
2647 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2648 | |
54d01ffb DG |
2649 | switch (domain) { |
2650 | case LTTNG_DOMAIN_KERNEL: | |
2651 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2652 | session->kernel_session); | |
2653 | if (kchan == NULL) { | |
2654 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2655 | ret = channel_kernel_create(session->kernel_session, NULL, |
2656 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2657 | if (ret != LTTCOMM_OK) { |
2658 | goto error; | |
d36b8583 | 2659 | } |
0d0c377a | 2660 | |
8f69e5eb DG |
2661 | /* Get the newly created kernel channel pointer */ |
2662 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2663 | session->kernel_session); | |
2664 | if (kchan == NULL) { | |
2665 | /* This sould not happen... */ | |
2666 | ret = LTTCOMM_FATAL; | |
2667 | goto error; | |
2668 | } | |
2669 | ||
54d01ffb | 2670 | } |
0fdd1e2c | 2671 | |
7a3d1328 | 2672 | switch (event_type) { |
76d45b40 | 2673 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2674 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2675 | kchan, kernel_tracer_fd); |
7a3d1328 | 2676 | break; |
76d45b40 | 2677 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2678 | /* |
7a3d1328 MD |
2679 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2680 | * events already registered to the channel. | |
8c9ae521 | 2681 | */ |
7a3d1328 MD |
2682 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2683 | kchan, kernel_tracer_fd); | |
2684 | break; | |
76d45b40 | 2685 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2686 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2687 | ret = event_kernel_enable_all(session->kernel_session, |
2688 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2689 | break; |
2690 | default: | |
2691 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2692 | goto error; | |
8c9ae521 | 2693 | } |
8f69e5eb DG |
2694 | |
2695 | /* Manage return value */ | |
54d01ffb | 2696 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2697 | goto error; |
d36b8583 DG |
2698 | } |
2699 | ||
54d01ffb | 2700 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2701 | break; |
76d45b40 DG |
2702 | case LTTNG_DOMAIN_UST: |
2703 | { | |
2704 | struct lttng_channel *attr; | |
2705 | struct ltt_ust_channel *uchan; | |
2706 | struct ltt_ust_session *usess = session->ust_session; | |
2707 | ||
2708 | /* Get channel from global UST domain */ | |
2709 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2710 | channel_name); | |
2711 | if (uchan == NULL) { | |
2712 | /* Create default channel */ | |
2713 | attr = channel_new_default_attr(domain); | |
2714 | if (attr == NULL) { | |
2715 | ret = LTTCOMM_FATAL; | |
2716 | goto error; | |
2717 | } | |
2718 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2719 | attr->name[NAME_MAX - 1] = '\0'; | |
2720 | ||
2721 | /* Use the internal command enable channel */ | |
7885e399 | 2722 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2723 | if (ret != LTTCOMM_OK) { |
2724 | free(attr); | |
2725 | goto error; | |
2726 | } | |
2727 | free(attr); | |
2728 | ||
2729 | /* Get the newly created channel reference back */ | |
2730 | uchan = trace_ust_find_channel_by_name( | |
2731 | usess->domain_global.channels, channel_name); | |
2732 | if (uchan == NULL) { | |
2733 | /* Something is really wrong */ | |
2734 | ret = LTTCOMM_FATAL; | |
2735 | goto error; | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | /* At this point, the session and channel exist on the tracer */ | |
2740 | ||
2741 | switch (event_type) { | |
2742 | case LTTNG_EVENT_ALL: | |
2743 | case LTTNG_EVENT_TRACEPOINT: | |
2744 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2745 | if (ret != LTTCOMM_OK) { | |
2746 | goto error; | |
2747 | } | |
2748 | break; | |
2749 | default: | |
2750 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2751 | goto error; | |
2752 | } | |
2753 | ||
2754 | /* Manage return value */ | |
2755 | if (ret != LTTCOMM_OK) { | |
2756 | goto error; | |
2757 | } | |
2758 | ||
2759 | break; | |
2760 | } | |
2761 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2762 | case LTTNG_DOMAIN_UST_PID: | |
2763 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2764 | default: |
54d01ffb DG |
2765 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2766 | goto error; | |
d36b8583 | 2767 | } |
f3ed775e | 2768 | |
54d01ffb DG |
2769 | ret = LTTCOMM_OK; |
2770 | ||
2771 | error: | |
2772 | return ret; | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2777 | */ | |
2778 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2779 | { | |
2780 | int ret; | |
2781 | ssize_t nb_events = 0; | |
2782 | ||
2783 | switch (domain) { | |
2784 | case LTTNG_DOMAIN_KERNEL: | |
2785 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2786 | if (nb_events < 0) { | |
2787 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2788 | goto error; | |
894be886 | 2789 | } |
54d01ffb | 2790 | break; |
b551a063 DG |
2791 | case LTTNG_DOMAIN_UST: |
2792 | nb_events = ust_app_list_events(events); | |
2793 | if (nb_events < 0) { | |
2794 | ret = LTTCOMM_UST_LIST_FAIL; | |
2795 | goto error; | |
2796 | } | |
2797 | break; | |
54d01ffb | 2798 | default: |
54d01ffb DG |
2799 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2800 | goto error; | |
2801 | } | |
894be886 | 2802 | |
54d01ffb | 2803 | return nb_events; |
7d29a247 | 2804 | |
54d01ffb DG |
2805 | error: |
2806 | /* Return negative value to differentiate return code */ | |
2807 | return -ret; | |
2808 | } | |
b389abbe | 2809 | |
54d01ffb DG |
2810 | /* |
2811 | * Command LTTNG_START_TRACE processed by the client thread. | |
2812 | */ | |
2813 | static int cmd_start_trace(struct ltt_session *session) | |
2814 | { | |
2815 | int ret; | |
54d01ffb | 2816 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2817 | struct ltt_ust_session *usess; |
b389abbe | 2818 | |
54d01ffb DG |
2819 | /* Short cut */ |
2820 | ksession = session->kernel_session; | |
b9d9b220 | 2821 | usess = session->ust_session; |
5eb91c98 | 2822 | |
b9ef1c83 DG |
2823 | if (session->enabled) { |
2824 | ret = LTTCOMM_UST_START_FAIL; | |
2825 | goto error; | |
2826 | } | |
2827 | ||
464dd62d MD |
2828 | session->enabled = 1; |
2829 | ||
54d01ffb DG |
2830 | /* Kernel tracing */ |
2831 | if (ksession != NULL) { | |
2bdd86d4 MD |
2832 | struct ltt_kernel_channel *kchan; |
2833 | ||
54d01ffb DG |
2834 | /* Open kernel metadata */ |
2835 | if (ksession->metadata == NULL) { | |
2836 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2837 | if (ret < 0) { | |
2838 | ret = LTTCOMM_KERN_META_FAIL; | |
2839 | goto error; | |
b389abbe | 2840 | } |
54d01ffb | 2841 | } |
7d29a247 | 2842 | |
54d01ffb DG |
2843 | /* Open kernel metadata stream */ |
2844 | if (ksession->metadata_stream_fd == 0) { | |
2845 | ret = kernel_open_metadata_stream(ksession); | |
2846 | if (ret < 0) { | |
2847 | ERR("Kernel create metadata stream failed"); | |
2848 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2849 | goto error; | |
2850 | } | |
2851 | } | |
2852 | ||
2853 | /* For each channel */ | |
2854 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2855 | if (kchan->stream_count == 0) { | |
2856 | ret = kernel_open_channel_stream(kchan); | |
2857 | if (ret < 0) { | |
2858 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2859 | goto error; |
2860 | } | |
54d01ffb DG |
2861 | /* Update the stream global counter */ |
2862 | ksession->stream_count_global += ret; | |
7d29a247 | 2863 | } |
54d01ffb DG |
2864 | } |
2865 | ||
2866 | /* Setup kernel consumer socket and send fds to it */ | |
2867 | ret = init_kernel_tracing(ksession); | |
2868 | if (ret < 0) { | |
2869 | ret = LTTCOMM_KERN_START_FAIL; | |
2870 | goto error; | |
2871 | } | |
2872 | ||
2873 | /* This start the kernel tracing */ | |
2874 | ret = kernel_start_session(ksession); | |
2875 | if (ret < 0) { | |
2876 | ret = LTTCOMM_KERN_START_FAIL; | |
2877 | goto error; | |
2878 | } | |
2879 | ||
2880 | /* Quiescent wait after starting trace */ | |
2881 | kernel_wait_quiescent(kernel_tracer_fd); | |
2882 | } | |
2883 | ||
36dc12cc | 2884 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2885 | if (usess) { |
2886 | usess->start_trace = 1; | |
36dc12cc | 2887 | |
b9d9b220 DG |
2888 | ret = ust_app_start_trace_all(usess); |
2889 | if (ret < 0) { | |
2890 | ret = LTTCOMM_UST_START_FAIL; | |
2891 | goto error; | |
2892 | } | |
2bdd86d4 | 2893 | } |
54d01ffb DG |
2894 | |
2895 | ret = LTTCOMM_OK; | |
2896 | ||
2897 | error: | |
2898 | return ret; | |
2899 | } | |
2900 | ||
2901 | /* | |
2902 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2903 | */ | |
2904 | static int cmd_stop_trace(struct ltt_session *session) | |
2905 | { | |
2906 | int ret; | |
2907 | struct ltt_kernel_channel *kchan; | |
2908 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2909 | struct ltt_ust_session *usess; |
54d01ffb DG |
2910 | |
2911 | /* Short cut */ | |
2912 | ksession = session->kernel_session; | |
8be98f9a | 2913 | usess = session->ust_session; |
54d01ffb | 2914 | |
b9ef1c83 | 2915 | if (!session->enabled) { |
190df5ac | 2916 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2917 | goto error; |
2918 | } | |
2919 | ||
464dd62d MD |
2920 | session->enabled = 0; |
2921 | ||
54d01ffb DG |
2922 | /* Kernel tracer */ |
2923 | if (ksession != NULL) { | |
2924 | DBG("Stop kernel tracing"); | |
2925 | ||
2926 | /* Flush all buffers before stopping */ | |
2927 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2928 | if (ret < 0) { | |
2929 | ERR("Kernel metadata flush failed"); | |
2930 | } | |
f34daff7 | 2931 | |
54d01ffb DG |
2932 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2933 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2934 | if (ret < 0) { |
54d01ffb | 2935 | ERR("Kernel flush buffer error"); |
7d29a247 | 2936 | } |
54d01ffb | 2937 | } |
19e70852 | 2938 | |
54d01ffb DG |
2939 | ret = kernel_stop_session(ksession); |
2940 | if (ret < 0) { | |
2941 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2942 | goto error; |
f3ed775e | 2943 | } |
54d01ffb DG |
2944 | |
2945 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2946 | } |
54d01ffb | 2947 | |
8be98f9a MD |
2948 | if (usess) { |
2949 | usess->start_trace = 0; | |
2bdd86d4 | 2950 | |
8be98f9a | 2951 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2952 | if (ret < 0) { |
190df5ac | 2953 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2954 | goto error; |
2955 | } | |
2bdd86d4 | 2956 | } |
54d01ffb DG |
2957 | |
2958 | ret = LTTCOMM_OK; | |
2959 | ||
2960 | error: | |
2961 | return ret; | |
2962 | } | |
2963 | ||
2964 | /* | |
2965 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2966 | */ | |
6df2e2c9 | 2967 | static int cmd_create_session(char *name, char *path, struct ucred *creds) |
54d01ffb DG |
2968 | { |
2969 | int ret; | |
2970 | ||
6df2e2c9 | 2971 | ret = session_create(name, path, creds->uid, creds->gid); |
54d01ffb DG |
2972 | if (ret != LTTCOMM_OK) { |
2973 | goto error; | |
2974 | } | |
2975 | ||
2976 | ret = LTTCOMM_OK; | |
2977 | ||
2978 | error: | |
2979 | return ret; | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2984 | */ | |
2985 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2986 | { | |
2987 | int ret; | |
2988 | ||
2989 | /* Clean kernel session teardown */ | |
2990 | teardown_kernel_session(session); | |
84cd17c6 MD |
2991 | /* UST session teardown */ |
2992 | teardown_ust_session(session); | |
54d01ffb DG |
2993 | |
2994 | /* | |
2995 | * Must notify the kernel thread here to update it's poll setin order | |
2996 | * to remove the channel(s)' fd just destroyed. | |
2997 | */ | |
2998 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2999 | if (ret < 0) { | |
3000 | perror("write kernel poll pipe"); | |
3001 | } | |
3002 | ||
271933a4 | 3003 | ret = session_destroy(session); |
54d01ffb DG |
3004 | |
3005 | return ret; | |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3010 | */ | |
3011 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3012 | { | |
3013 | int ret; | |
3014 | ||
3015 | switch (domain) { | |
3016 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3017 | { |
54d01ffb | 3018 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3019 | |
54d01ffb DG |
3020 | kcalibrate.type = calibrate->type; |
3021 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3022 | if (ret < 0) { |
54d01ffb DG |
3023 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3024 | goto error; | |
33a2b854 | 3025 | } |
54d01ffb DG |
3026 | break; |
3027 | } | |
3028 | default: | |
3029 | /* TODO: Userspace tracing */ | |
3030 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3031 | goto error; | |
3032 | } | |
33a2b854 | 3033 | |
54d01ffb | 3034 | ret = LTTCOMM_OK; |
33a2b854 | 3035 | |
54d01ffb DG |
3036 | error: |
3037 | return ret; | |
3038 | } | |
7d29a247 | 3039 | |
54d01ffb DG |
3040 | /* |
3041 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3042 | */ | |
3043 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3044 | char *sock_path) | |
3045 | { | |
3046 | int ret, sock; | |
b389abbe | 3047 | |
54d01ffb DG |
3048 | switch (domain) { |
3049 | case LTTNG_DOMAIN_KERNEL: | |
3050 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3051 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3052 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3053 | goto error; | |
3054 | } | |
3055 | ||
3056 | sock = lttcomm_connect_unix_sock(sock_path); | |
3057 | if (sock < 0) { | |
3058 | ret = LTTCOMM_CONNECT_FAIL; | |
3059 | goto error; | |
3060 | } | |
3061 | ||
3062 | session->kernel_session->consumer_fd = sock; | |
3063 | break; | |
3064 | default: | |
3065 | /* TODO: Userspace tracing */ | |
3066 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3067 | goto error; | |
3068 | } | |
3069 | ||
3070 | ret = LTTCOMM_OK; | |
3071 | ||
3072 | error: | |
3073 | return ret; | |
3074 | } | |
3075 | ||
3076 | /* | |
3077 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3078 | */ | |
3079 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3080 | struct lttng_domain **domains) | |
3081 | { | |
b551a063 | 3082 | int ret, index = 0; |
54d01ffb DG |
3083 | ssize_t nb_dom = 0; |
3084 | ||
3085 | if (session->kernel_session != NULL) { | |
b551a063 | 3086 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3087 | nb_dom++; |
3088 | } | |
3089 | ||
b551a063 DG |
3090 | if (session->ust_session != NULL) { |
3091 | DBG3("Listing domains found UST global domain"); | |
3092 | nb_dom++; | |
3093 | } | |
54d01ffb | 3094 | |
b551a063 | 3095 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3096 | if (*domains == NULL) { |
3097 | ret = -LTTCOMM_FATAL; | |
3098 | goto error; | |
3099 | } | |
3100 | ||
b551a063 DG |
3101 | if (session->kernel_session != NULL) { |
3102 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3103 | index++; | |
3104 | } | |
3105 | ||
3106 | if (session->ust_session != NULL) { | |
3107 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3108 | index++; | |
3109 | } | |
54d01ffb | 3110 | |
54d01ffb DG |
3111 | return nb_dom; |
3112 | ||
3113 | error: | |
3114 | return ret; | |
3115 | } | |
3116 | ||
3117 | /* | |
3118 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3119 | */ | |
b551a063 | 3120 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3121 | struct lttng_channel **channels) |
3122 | { | |
3123 | int ret; | |
3124 | ssize_t nb_chan = 0; | |
3125 | ||
b551a063 DG |
3126 | switch (domain) { |
3127 | case LTTNG_DOMAIN_KERNEL: | |
3128 | if (session->kernel_session != NULL) { | |
3129 | nb_chan = session->kernel_session->channel_count; | |
3130 | } | |
0df502fd | 3131 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3132 | break; |
3133 | case LTTNG_DOMAIN_UST: | |
3134 | if (session->ust_session != NULL) { | |
bec39940 | 3135 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3136 | session->ust_session->domain_global.channels); |
3137 | } | |
0df502fd | 3138 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3139 | break; |
3140 | default: | |
3141 | *channels = NULL; | |
3142 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3143 | goto error; |
3144 | } | |
3145 | ||
b551a063 DG |
3146 | if (nb_chan > 0) { |
3147 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3148 | if (*channels == NULL) { | |
3149 | ret = -LTTCOMM_FATAL; | |
3150 | goto error; | |
3151 | } | |
54d01ffb | 3152 | |
b551a063 DG |
3153 | list_lttng_channels(domain, session, *channels); |
3154 | } else { | |
3155 | *channels = NULL; | |
3156 | } | |
2bdd86d4 | 3157 | |
54d01ffb DG |
3158 | return nb_chan; |
3159 | ||
3160 | error: | |
3161 | return ret; | |
3162 | } | |
3163 | ||
3164 | /* | |
3165 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3166 | */ | |
b551a063 | 3167 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3168 | char *channel_name, struct lttng_event **events) |
3169 | { | |
b551a063 | 3170 | int ret = 0; |
54d01ffb | 3171 | ssize_t nb_event = 0; |
54d01ffb | 3172 | |
b551a063 DG |
3173 | switch (domain) { |
3174 | case LTTNG_DOMAIN_KERNEL: | |
3175 | if (session->kernel_session != NULL) { | |
3176 | nb_event = list_lttng_kernel_events(channel_name, | |
3177 | session->kernel_session, events); | |
54d01ffb | 3178 | } |
b551a063 DG |
3179 | break; |
3180 | case LTTNG_DOMAIN_UST: | |
3181 | { | |
3182 | if (session->ust_session != NULL) { | |
3183 | nb_event = list_lttng_ust_global_events(channel_name, | |
3184 | &session->ust_session->domain_global, events); | |
3185 | } | |
3186 | break; | |
54d01ffb | 3187 | } |
b551a063 DG |
3188 | default: |
3189 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3190 | goto error; |
3191 | } | |
3192 | ||
b551a063 | 3193 | ret = nb_event; |
54d01ffb DG |
3194 | |
3195 | error: | |
3196 | return ret; | |
3197 | } | |
3198 | ||
3199 | /* | |
3200 | * Process the command requested by the lttng client within the command | |
3201 | * context structure. This function make sure that the return structure (llm) | |
3202 | * is set and ready for transmission before returning. | |
3203 | * | |
3204 | * Return any error encountered or 0 for success. | |
3205 | */ | |
3206 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3207 | { | |
3208 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3209 | int need_tracing_session = 1; |
54d01ffb DG |
3210 | |
3211 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3212 | ||
4fba7219 DG |
3213 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3214 | ret = LTTCOMM_KERN_NA; | |
3215 | goto error; | |
3216 | } | |
3217 | ||
54d01ffb DG |
3218 | /* |
3219 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3220 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3221 | * command. |
3222 | */ | |
3223 | switch(cmd_ctx->lsm->cmd_type) { | |
3224 | case LTTNG_LIST_SESSIONS: | |
3225 | case LTTNG_LIST_TRACEPOINTS: | |
3226 | case LTTNG_LIST_DOMAINS: | |
3227 | case LTTNG_LIST_CHANNELS: | |
3228 | case LTTNG_LIST_EVENTS: | |
3229 | break; | |
3230 | default: | |
3231 | /* Setup lttng message with no payload */ | |
3232 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3233 | if (ret < 0) { | |
3234 | /* This label does not try to unlock the session */ | |
3235 | goto init_setup_error; | |
3236 | } | |
3237 | } | |
3238 | ||
3239 | /* Commands that DO NOT need a session. */ | |
3240 | switch (cmd_ctx->lsm->cmd_type) { | |
3241 | case LTTNG_CALIBRATE: | |
3242 | case LTTNG_CREATE_SESSION: | |
3243 | case LTTNG_LIST_SESSIONS: | |
3244 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3245 | need_tracing_session = 0; |
54d01ffb DG |
3246 | break; |
3247 | default: | |
3248 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3249 | session_lock_list(); |
54d01ffb | 3250 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3251 | session_unlock_list(); |
54d01ffb DG |
3252 | if (cmd_ctx->session == NULL) { |
3253 | if (cmd_ctx->lsm->session.name != NULL) { | |
3254 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3255 | } else { | |
3256 | /* If no session name specified */ | |
3257 | ret = LTTCOMM_SELECT_SESS; | |
3258 | } | |
3259 | goto error; | |
3260 | } else { | |
3261 | /* Acquire lock for the session */ | |
3262 | session_lock(cmd_ctx->session); | |
3263 | } | |
3264 | break; | |
3265 | } | |
b389abbe | 3266 | |
54d01ffb DG |
3267 | /* |
3268 | * Check domain type for specific "pre-action". | |
3269 | */ | |
3270 | switch (cmd_ctx->lsm->domain.type) { | |
3271 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 DG |
3272 | if (!is_root) { |
3273 | ret = LTTCOMM_KERN_NA; | |
3274 | goto error; | |
3275 | } | |
3276 | ||
54d01ffb DG |
3277 | /* Kernel tracer check */ |
3278 | if (kernel_tracer_fd == 0) { | |
3279 | /* Basically, load kernel tracer modules */ | |
3280 | init_kernel_tracer(); | |
3281 | if (kernel_tracer_fd == 0) { | |
3282 | ret = LTTCOMM_KERN_NA; | |
3283 | goto error; | |
3284 | } | |
3285 | } | |
5eb91c98 | 3286 | |
54d01ffb | 3287 | /* Need a session for kernel command */ |
44d3bd01 | 3288 | if (need_tracing_session) { |
54d01ffb | 3289 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3290 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3291 | if (ret < 0) { |
54d01ffb | 3292 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3293 | goto error; |
3294 | } | |
b389abbe | 3295 | } |
7d29a247 | 3296 | |
54d01ffb | 3297 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3298 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3299 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3300 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3301 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3302 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3303 | if (ret < 0) { |
54d01ffb DG |
3304 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3305 | goto error; | |
950131af | 3306 | } |
3ff2ecac MD |
3307 | } else { |
3308 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3309 | } |
0d0c377a | 3310 | } |
54d01ffb | 3311 | break; |
2bdd86d4 | 3312 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3313 | { |
44d3bd01 | 3314 | if (need_tracing_session) { |
f6a9efaa | 3315 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3316 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3317 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3318 | if (ret != LTTCOMM_OK) { |
3319 | goto error; | |
3320 | } | |
3321 | } | |
7753dea8 MD |
3322 | /* Start the UST consumer daemons */ |
3323 | /* 64-bit */ | |
3324 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3325 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3326 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3327 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3328 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3329 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3330 | if (ret < 0) { |
7753dea8 MD |
3331 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3332 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3333 | goto error; |
3334 | } | |
48842b30 | 3335 | |
7753dea8 | 3336 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3337 | } else { |
7753dea8 MD |
3338 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3339 | } | |
3340 | /* 32-bit */ | |
fc7a59ce | 3341 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3342 | ustconsumer32_data.pid == 0 && |
3343 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3344 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3345 | ret = start_consumerd(&ustconsumer32_data); | |
3346 | if (ret < 0) { | |
3347 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3348 | ust_consumerd32_fd = -EINVAL; | |
3349 | goto error; | |
3350 | } | |
3351 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3352 | } else { | |
3353 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3354 | } |
44d3bd01 DG |
3355 | } |
3356 | break; | |
48842b30 | 3357 | } |
54d01ffb | 3358 | default: |
54d01ffb DG |
3359 | break; |
3360 | } | |
33a2b854 | 3361 | |
8e0af1b4 MD |
3362 | /* |
3363 | * Check that the UID or GID match that of the tracing session. | |
3364 | * The root user can interact with all sessions. | |
3365 | */ | |
3366 | if (need_tracing_session) { | |
3367 | if (!session_access_ok(cmd_ctx->session, | |
3368 | cmd_ctx->creds.uid, cmd_ctx->creds.gid)) { | |
3369 | ret = LTTCOMM_EPERM; | |
3370 | goto error; | |
3371 | } | |
3372 | } | |
3373 | ||
54d01ffb DG |
3374 | /* Process by command type */ |
3375 | switch (cmd_ctx->lsm->cmd_type) { | |
3376 | case LTTNG_ADD_CONTEXT: | |
3377 | { | |
3378 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3379 | cmd_ctx->lsm->u.context.channel_name, | |
3380 | cmd_ctx->lsm->u.context.event_name, | |
3381 | &cmd_ctx->lsm->u.context.ctx); | |
3382 | break; | |
3383 | } | |
3384 | case LTTNG_DISABLE_CHANNEL: | |
3385 | { | |
3386 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3387 | cmd_ctx->lsm->u.disable.channel_name); | |
3388 | break; | |
3389 | } | |
3390 | case LTTNG_DISABLE_EVENT: | |
3391 | { | |
3392 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3393 | cmd_ctx->lsm->u.disable.channel_name, | |
3394 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3395 | ret = LTTCOMM_OK; |
3396 | break; | |
3397 | } | |
54d01ffb DG |
3398 | case LTTNG_DISABLE_ALL_EVENT: |
3399 | { | |
2bdd86d4 | 3400 | DBG("Disabling all events"); |
54d01ffb DG |
3401 | |
3402 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3403 | cmd_ctx->lsm->u.disable.channel_name); | |
3404 | break; | |
3405 | } | |
3406 | case LTTNG_ENABLE_CHANNEL: | |
3407 | { | |
aea829b3 | 3408 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3409 | &cmd_ctx->lsm->u.channel.chan); |
3410 | break; | |
3411 | } | |
3412 | case LTTNG_ENABLE_EVENT: | |
3413 | { | |
3414 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3415 | cmd_ctx->lsm->u.enable.channel_name, | |
3416 | &cmd_ctx->lsm->u.enable.event); | |
3417 | break; | |
3418 | } | |
3419 | case LTTNG_ENABLE_ALL_EVENT: | |
3420 | { | |
2bdd86d4 | 3421 | DBG("Enabling all events"); |
54d01ffb DG |
3422 | |
3423 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3424 | cmd_ctx->lsm->u.enable.channel_name, |
3425 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3426 | break; |
3427 | } | |
052da939 | 3428 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3429 | { |
9f19cc17 | 3430 | struct lttng_event *events; |
54d01ffb | 3431 | ssize_t nb_events; |
052da939 | 3432 | |
54d01ffb DG |
3433 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3434 | if (nb_events < 0) { | |
3435 | ret = -nb_events; | |
3436 | goto error; | |
2ef84c95 DG |
3437 | } |
3438 | ||
3439 | /* | |
3440 | * Setup lttng message with payload size set to the event list size in | |
3441 | * bytes and then copy list into the llm payload. | |
3442 | */ | |
052da939 | 3443 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3444 | if (ret < 0) { |
052da939 | 3445 | free(events); |
2ef84c95 DG |
3446 | goto setup_error; |
3447 | } | |
3448 | ||
3449 | /* Copy event list into message payload */ | |
9f19cc17 | 3450 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3451 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3452 | |
9f19cc17 | 3453 | free(events); |
2ef84c95 DG |
3454 | |
3455 | ret = LTTCOMM_OK; | |
3456 | break; | |
3457 | } | |
f3ed775e | 3458 | case LTTNG_START_TRACE: |
8c0faa1d | 3459 | { |
54d01ffb | 3460 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3461 | break; |
3462 | } | |
f3ed775e | 3463 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3464 | { |
54d01ffb | 3465 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3466 | break; |
3467 | } | |
5e16da05 MD |
3468 | case LTTNG_CREATE_SESSION: |
3469 | { | |
54d01ffb | 3470 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3471 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3472 | break; |
3473 | } | |
3474 | case LTTNG_DESTROY_SESSION: | |
3475 | { | |
54d01ffb DG |
3476 | ret = cmd_destroy_session(cmd_ctx->session, |
3477 | cmd_ctx->lsm->session.name); | |
5461b305 | 3478 | break; |
5e16da05 | 3479 | } |
9f19cc17 | 3480 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3481 | { |
54d01ffb DG |
3482 | ssize_t nb_dom; |
3483 | struct lttng_domain *domains; | |
5461b305 | 3484 | |
54d01ffb DG |
3485 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3486 | if (nb_dom < 0) { | |
3487 | ret = -nb_dom; | |
3488 | goto error; | |
ce3d728c | 3489 | } |
520ff687 | 3490 | |
54d01ffb | 3491 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3492 | if (ret < 0) { |
3493 | goto setup_error; | |
520ff687 | 3494 | } |
57167058 | 3495 | |
54d01ffb DG |
3496 | /* Copy event list into message payload */ |
3497 | memcpy(cmd_ctx->llm->payload, domains, | |
3498 | nb_dom * sizeof(struct lttng_domain)); | |
3499 | ||
3500 | free(domains); | |
5e16da05 | 3501 | |
5461b305 | 3502 | ret = LTTCOMM_OK; |
5e16da05 MD |
3503 | break; |
3504 | } | |
9f19cc17 | 3505 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3506 | { |
54d01ffb DG |
3507 | size_t nb_chan; |
3508 | struct lttng_channel *channels; | |
3509 | ||
b551a063 DG |
3510 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3511 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3512 | if (nb_chan < 0) { |
3513 | ret = -nb_chan; | |
3514 | goto error; | |
5461b305 | 3515 | } |
ca95a216 | 3516 | |
54d01ffb | 3517 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3518 | if (ret < 0) { |
3519 | goto setup_error; | |
3520 | } | |
9f19cc17 | 3521 | |
54d01ffb DG |
3522 | /* Copy event list into message payload */ |
3523 | memcpy(cmd_ctx->llm->payload, channels, | |
3524 | nb_chan * sizeof(struct lttng_channel)); | |
3525 | ||
3526 | free(channels); | |
9f19cc17 DG |
3527 | |
3528 | ret = LTTCOMM_OK; | |
5461b305 | 3529 | break; |
5e16da05 | 3530 | } |
9f19cc17 | 3531 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3532 | { |
b551a063 | 3533 | ssize_t nb_event; |
684d34d2 | 3534 | struct lttng_event *events = NULL; |
9f19cc17 | 3535 | |
b551a063 | 3536 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3537 | cmd_ctx->lsm->u.list.channel_name, &events); |
3538 | if (nb_event < 0) { | |
3539 | ret = -nb_event; | |
3540 | goto error; | |
5461b305 | 3541 | } |
ca95a216 | 3542 | |
54d01ffb | 3543 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3544 | if (ret < 0) { |
3545 | goto setup_error; | |
3546 | } | |
9f19cc17 | 3547 | |
54d01ffb DG |
3548 | /* Copy event list into message payload */ |
3549 | memcpy(cmd_ctx->llm->payload, events, | |
3550 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3551 | |
54d01ffb | 3552 | free(events); |
9f19cc17 DG |
3553 | |
3554 | ret = LTTCOMM_OK; | |
5461b305 | 3555 | break; |
5e16da05 MD |
3556 | } |
3557 | case LTTNG_LIST_SESSIONS: | |
3558 | { | |
8e0af1b4 | 3559 | unsigned int nr_sessions; |
5461b305 | 3560 | |
8e0af1b4 MD |
3561 | session_lock_list(); |
3562 | nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
3563 | if (nr_sessions == 0) { | |
f3ed775e | 3564 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3565 | session_unlock_list(); |
5461b305 | 3566 | goto error; |
57167058 | 3567 | } |
8e0af1b4 | 3568 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3569 | if (ret < 0) { |
54d01ffb | 3570 | session_unlock_list(); |
5461b305 | 3571 | goto setup_error; |
e065084a | 3572 | } |
5e16da05 | 3573 | |
6c9cc2ab | 3574 | /* Filled the session array */ |
8e0af1b4 MD |
3575 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
3576 | cmd_ctx->creds.uid, cmd_ctx->creds.gid); | |
6c9cc2ab | 3577 | |
54d01ffb | 3578 | session_unlock_list(); |
5e16da05 | 3579 | |
5461b305 | 3580 | ret = LTTCOMM_OK; |
5e16da05 MD |
3581 | break; |
3582 | } | |
d0254c7c MD |
3583 | case LTTNG_CALIBRATE: |
3584 | { | |
54d01ffb DG |
3585 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3586 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3587 | break; |
3588 | } | |
d9800920 DG |
3589 | case LTTNG_REGISTER_CONSUMER: |
3590 | { | |
54d01ffb DG |
3591 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3592 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3593 | break; |
3594 | } | |
5e16da05 | 3595 | default: |
5e16da05 | 3596 | ret = LTTCOMM_UND; |
5461b305 | 3597 | break; |
fac6795d DG |
3598 | } |
3599 | ||
5461b305 | 3600 | error: |
5461b305 DG |
3601 | if (cmd_ctx->llm == NULL) { |
3602 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3603 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3604 | goto setup_error; |
3605 | } | |
3606 | } | |
54d01ffb | 3607 | /* Set return code */ |
5461b305 | 3608 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3609 | setup_error: |
b5541356 | 3610 | if (cmd_ctx->session) { |
54d01ffb | 3611 | session_unlock(cmd_ctx->session); |
b5541356 | 3612 | } |
54d01ffb | 3613 | init_setup_error: |
8028d920 | 3614 | return ret; |
fac6795d DG |
3615 | } |
3616 | ||
1d4b027a | 3617 | /* |
d063d709 DG |
3618 | * This thread manage all clients request using the unix client socket for |
3619 | * communication. | |
1d4b027a DG |
3620 | */ |
3621 | static void *thread_manage_clients(void *data) | |
3622 | { | |
5eb91c98 DG |
3623 | int sock = 0, ret, i, pollfd; |
3624 | uint32_t revents, nb_fd; | |
273ea72c | 3625 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3626 | struct lttng_poll_event events; |
1d4b027a DG |
3627 | |
3628 | DBG("[thread] Manage client started"); | |
3629 | ||
f6a9efaa DG |
3630 | rcu_register_thread(); |
3631 | ||
1d4b027a DG |
3632 | ret = lttcomm_listen_unix_sock(client_sock); |
3633 | if (ret < 0) { | |
3634 | goto error; | |
3635 | } | |
3636 | ||
5eb91c98 DG |
3637 | /* |
3638 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3639 | * more will be added to this poll set. | |
3640 | */ | |
3641 | ret = create_thread_poll_set(&events, 2); | |
3642 | if (ret < 0) { | |
3643 | goto error; | |
3644 | } | |
273ea72c | 3645 | |
5eb91c98 DG |
3646 | /* Add the application registration socket */ |
3647 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3648 | if (ret < 0) { | |
3649 | goto error; | |
3650 | } | |
273ea72c | 3651 | |
bbd973c2 DG |
3652 | /* |
3653 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3654 | */ |
3655 | if (opt_sig_parent) { | |
3656 | kill(ppid, SIGCHLD); | |
3657 | } | |
3658 | ||
3659 | while (1) { | |
1d4b027a | 3660 | DBG("Accepting client command ..."); |
273ea72c | 3661 | |
5eb91c98 DG |
3662 | nb_fd = LTTNG_POLL_GETNB(&events); |
3663 | ||
273ea72c | 3664 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3665 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3666 | if (ret < 0) { |
273ea72c DG |
3667 | goto error; |
3668 | } | |
3669 | ||
5eb91c98 DG |
3670 | for (i = 0; i < nb_fd; i++) { |
3671 | /* Fetch once the poll data */ | |
3672 | revents = LTTNG_POLL_GETEV(&events, i); | |
3673 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3674 | ||
3675 | /* Thread quit pipe has been closed. Killing thread. */ | |
3676 | ret = check_thread_quit_pipe(pollfd, revents); | |
3677 | if (ret) { | |
3678 | goto error; | |
3679 | } | |
3680 | ||
3681 | /* Event on the registration socket */ | |
3682 | if (pollfd == client_sock) { | |
3683 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3684 | ERR("Client socket poll error"); | |
3685 | goto error; | |
3686 | } | |
3687 | } | |
3688 | } | |
3689 | ||
3690 | DBG("Wait for client response"); | |
3691 | ||
3692 | sock = lttcomm_accept_unix_sock(client_sock); | |
3693 | if (sock < 0) { | |
273ea72c | 3694 | goto error; |
273ea72c DG |
3695 | } |
3696 | ||
be040666 DG |
3697 | /* Set socket option for credentials retrieval */ |
3698 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3699 | if (ret < 0) { | |
3700 | goto error; | |
3701 | } | |
3702 | ||
5eb91c98 | 3703 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3704 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3705 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3706 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3707 | goto error; |
5eb91c98 | 3708 | } |
1d4b027a | 3709 | |
5eb91c98 | 3710 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3711 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3712 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3713 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3714 | goto error; |
3715 | } | |
1d4b027a | 3716 | |
5eb91c98 DG |
3717 | cmd_ctx->llm = NULL; |
3718 | cmd_ctx->session = NULL; | |
1d4b027a | 3719 | |
5eb91c98 DG |
3720 | /* |
3721 | * Data is received from the lttng client. The struct | |
3722 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3723 | * the client. | |
3724 | */ | |
3725 | DBG("Receiving data from client ..."); | |
be040666 DG |
3726 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3727 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3728 | if (ret <= 0) { |
3729 | DBG("Nothing recv() from client... continuing"); | |
3730 | close(sock); | |
3731 | free(cmd_ctx); | |
3732 | continue; | |
3733 | } | |
1d4b027a | 3734 | |
5eb91c98 DG |
3735 | // TODO: Validate cmd_ctx including sanity check for |
3736 | // security purpose. | |
f7776ea7 | 3737 | |
f6a9efaa | 3738 | rcu_thread_online(); |
5eb91c98 DG |
3739 | /* |
3740 | * This function dispatch the work to the kernel or userspace tracer | |
3741 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3742 | * informations for the client. The command context struct contains | |
3743 | * everything this function may needs. | |
3744 | */ | |
3745 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3746 | rcu_thread_offline(); |
5eb91c98 | 3747 | if (ret < 0) { |
bbd973c2 | 3748 | /* |
5eb91c98 | 3749 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3750 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3751 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3752 | */ |
bbd973c2 | 3753 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3754 | continue; |
3755 | } | |
d6e4fca4 | 3756 | |
54d01ffb DG |
3757 | DBG("Sending response (size: %d, retcode: %s)", |
3758 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3759 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3760 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3761 | if (ret < 0) { |
3762 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3763 | } |
1d4b027a | 3764 | |
5eb91c98 | 3765 | /* End of transmission */ |
273ea72c | 3766 | close(sock); |
be040666 DG |
3767 | |
3768 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3769 | } |
3770 | ||
5eb91c98 DG |
3771 | error: |
3772 | DBG("Client thread dying"); | |
273ea72c | 3773 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3774 | close(client_sock); |
3775 | close(sock); | |
273ea72c | 3776 | |
5eb91c98 | 3777 | lttng_poll_clean(&events); |
a2fb29a5 | 3778 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3779 | |
3780 | rcu_unregister_thread(); | |
1d4b027a DG |
3781 | return NULL; |
3782 | } | |
3783 | ||
3784 | ||
fac6795d DG |
3785 | /* |
3786 | * usage function on stderr | |
3787 | */ | |
3788 | static void usage(void) | |
3789 | { | |
b716ce68 | 3790 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3791 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3792 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3793 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3794 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3795 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3796 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3797 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3798 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3799 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3800 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3801 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3802 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3803 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3804 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3805 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3806 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3807 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3808 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3809 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3810 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3811 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3812 | } |
3813 | ||
3814 | /* | |
3815 | * daemon argument parsing | |
3816 | */ | |
3817 | static int parse_args(int argc, char **argv) | |
3818 | { | |
3819 | int c; | |
3820 | ||
3821 | static struct option long_options[] = { | |
3822 | { "client-sock", 1, 0, 'c' }, | |
3823 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3824 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3825 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3826 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3827 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3828 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3829 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3830 | { "consumerd32-path", 1, 0, 'u' }, | |
3831 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3832 | { "consumerd64-path", 1, 0, 't' }, | |
3833 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3834 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3835 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3836 | { "help", 0, 0, 'h' }, |
3837 | { "group", 1, 0, 'g' }, | |
3838 | { "version", 0, 0, 'V' }, | |
75462a81 | 3839 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3840 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3841 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3842 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3843 | { NULL, 0, 0, 0 } |
3844 | }; | |
3845 | ||
3846 | while (1) { | |
3847 | int option_index = 0; | |
4fba7219 | 3848 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3849 | long_options, &option_index); |
fac6795d DG |
3850 | if (c == -1) { |
3851 | break; | |
3852 | } | |
3853 | ||
3854 | switch (c) { | |
3855 | case 0: | |
3856 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3857 | if (optarg) { | |
3858 | fprintf(stderr, " with arg %s\n", optarg); | |
3859 | } | |
3860 | break; | |
b716ce68 | 3861 | case 'c': |
fac6795d DG |
3862 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3863 | break; | |
3864 | case 'a': | |
3865 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3866 | break; | |
3867 | case 'd': | |
3868 | opt_daemon = 1; | |
3869 | break; | |
3870 | case 'g': | |
fb09408a | 3871 | opt_tracing_group = optarg; |
fac6795d DG |
3872 | break; |
3873 | case 'h': | |
3874 | usage(); | |
3875 | exit(EXIT_FAILURE); | |
3876 | case 'V': | |
3877 | fprintf(stdout, "%s\n", VERSION); | |
3878 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3879 | case 'S': |
3880 | opt_sig_parent = 1; | |
3881 | break; | |
d6f42150 | 3882 | case 'E': |
3bd1e081 | 3883 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3884 | break; |
3885 | case 'C': | |
3bd1e081 MD |
3886 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3887 | break; | |
3888 | case 'F': | |
7753dea8 | 3889 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3890 | break; |
3891 | case 'D': | |
7753dea8 MD |
3892 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3893 | break; | |
3894 | case 'H': | |
3895 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3896 | break; | |
3897 | case 'G': | |
3898 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3899 | break; |
4fba7219 DG |
3900 | case 'N': |
3901 | opt_no_kernel = 1; | |
3902 | break; | |
75462a81 DG |
3903 | case 'q': |
3904 | opt_quiet = 1; | |
3905 | break; | |
3f9947db | 3906 | case 'v': |
53086306 DG |
3907 | /* Verbose level can increase using multiple -v */ |
3908 | opt_verbose += 1; | |
3f9947db | 3909 | break; |
31f73cc9 | 3910 | case 'Z': |
3bd1e081 | 3911 | opt_verbose_consumer += 1; |
31f73cc9 | 3912 | break; |
fb09408a | 3913 | case 'u': |
fc7a59ce | 3914 | consumerd32_bin= optarg; |
ebaeda94 MD |
3915 | break; |
3916 | case 'U': | |
3917 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3918 | break; |
3919 | case 't': | |
fc7a59ce | 3920 | consumerd64_bin = optarg; |
ebaeda94 MD |
3921 | break; |
3922 | case 'T': | |
3923 | consumerd64_libdir = optarg; | |
fb09408a | 3924 | break; |
fac6795d DG |
3925 | default: |
3926 | /* Unknown option or other error. | |
3927 | * Error is printed by getopt, just return */ | |
3928 | return -1; | |
3929 | } | |
3930 | } | |
3931 | ||
3932 | return 0; | |
3933 | } | |
3934 | ||
3935 | /* | |
d063d709 | 3936 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3937 | * apps_sock - The communication socket for all UST apps. |
3938 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3939 | */ |
cf3af59e | 3940 | static int init_daemon_socket(void) |
fac6795d DG |
3941 | { |
3942 | int ret = 0; | |
3943 | mode_t old_umask; | |
3944 | ||
3945 | old_umask = umask(0); | |
3946 | ||
3947 | /* Create client tool unix socket */ | |
d6f42150 DG |
3948 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3949 | if (client_sock < 0) { | |
3950 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3951 | ret = -1; |
3952 | goto end; | |
3953 | } | |
3954 | ||
3955 | /* File permission MUST be 660 */ | |
3956 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3957 | if (ret < 0) { | |
d6f42150 | 3958 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3959 | perror("chmod"); |
3960 | goto end; | |
3961 | } | |
3962 | ||
3963 | /* Create the application unix socket */ | |
d6f42150 DG |
3964 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3965 | if (apps_sock < 0) { | |
3966 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3967 | ret = -1; |
3968 | goto end; | |
3969 | } | |
3970 | ||
d6f42150 | 3971 | /* File permission MUST be 666 */ |
54d01ffb DG |
3972 | ret = chmod(apps_unix_sock_path, |
3973 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3974 | if (ret < 0) { |
d6f42150 | 3975 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3976 | perror("chmod"); |
3977 | goto end; | |
3978 | } | |
3979 | ||
3980 | end: | |
3981 | umask(old_umask); | |
3982 | return ret; | |
3983 | } | |
3984 | ||
3985 | /* | |
54d01ffb DG |
3986 | * Check if the global socket is available, and if a daemon is answering at the |
3987 | * other side. If yes, error is returned. | |
fac6795d | 3988 | */ |
cf3af59e | 3989 | static int check_existing_daemon(void) |
fac6795d | 3990 | { |
7d8234d9 | 3991 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3992 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3993 | return 0; |
099e26bd | 3994 | } |
54d01ffb | 3995 | |
7d8234d9 | 3996 | /* Is there anybody out there ? */ |
099e26bd | 3997 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3998 | return -EEXIST; |
099e26bd | 3999 | } else { |
7d8234d9 | 4000 | return 0; |
099e26bd | 4001 | } |
fac6795d DG |
4002 | } |
4003 | ||
fac6795d | 4004 | /* |
d063d709 | 4005 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4006 | * |
d063d709 DG |
4007 | * Race window between mkdir and chown is OK because we are going from more |
4008 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4009 | */ |
be040666 | 4010 | static int set_permissions(char *rundir) |
fac6795d DG |
4011 | { |
4012 | int ret; | |
996b65c8 | 4013 | gid_t gid; |
fac6795d | 4014 | |
996b65c8 MD |
4015 | gid = allowed_group(); |
4016 | if (gid < 0) { | |
be040666 DG |
4017 | WARN("No tracing group detected"); |
4018 | ret = 0; | |
fac6795d DG |
4019 | goto end; |
4020 | } | |
4021 | ||
d6f42150 | 4022 | /* Set lttng run dir */ |
be040666 | 4023 | ret = chown(rundir, 0, gid); |
d6f42150 | 4024 | if (ret < 0) { |
be040666 | 4025 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4026 | perror("chown"); |
4027 | } | |
4028 | ||
4029 | /* lttng client socket path */ | |
996b65c8 | 4030 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4031 | if (ret < 0) { |
d6f42150 DG |
4032 | ERR("Unable to set group on %s", client_unix_sock_path); |
4033 | perror("chown"); | |
4034 | } | |
4035 | ||
3bd1e081 MD |
4036 | /* kconsumer error socket path */ |
4037 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4038 | if (ret < 0) { |
3bd1e081 MD |
4039 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4040 | perror("chown"); | |
4041 | } | |
4042 | ||
7753dea8 MD |
4043 | /* 64-bit ustconsumer error socket path */ |
4044 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4045 | if (ret < 0) { | |
4046 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4047 | perror("chown"); | |
4048 | } | |
4049 | ||
4050 | /* 32-bit ustconsumer compat32 error socket path */ | |
4051 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4052 | if (ret < 0) { |
7753dea8 | 4053 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4054 | perror("chown"); |
4055 | } | |
4056 | ||
d6f42150 | 4057 | DBG("All permissions are set"); |
e07ae692 | 4058 | |
fac6795d DG |
4059 | end: |
4060 | return ret; | |
4061 | } | |
4062 | ||
7a485870 | 4063 | /* |
d063d709 | 4064 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4065 | */ |
4066 | static int create_kernel_poll_pipe(void) | |
4067 | { | |
4068 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4069 | } | |
4070 | ||
099e26bd DG |
4071 | /* |
4072 | * Create the application command pipe to wake thread_manage_apps. | |
4073 | */ | |
4074 | static int create_apps_cmd_pipe(void) | |
4075 | { | |
4076 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4077 | } | |
4078 | ||
d6f42150 | 4079 | /* |
d063d709 | 4080 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4081 | */ |
67e40797 | 4082 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4083 | { |
4084 | int ret; | |
4085 | ||
67e40797 DG |
4086 | DBG3("Creating LTTng run directory: %s", rundir); |
4087 | ||
4088 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4089 | if (ret < 0) { |
b1f11e69 | 4090 | if (errno != EEXIST) { |
67e40797 | 4091 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4092 | goto error; |
4093 | } else { | |
4094 | ret = 0; | |
4095 | } | |
d6f42150 DG |
4096 | } |
4097 | ||
4098 | error: | |
4099 | return ret; | |
4100 | } | |
4101 | ||
4102 | /* | |
d063d709 DG |
4103 | * Setup sockets and directory needed by the kconsumerd communication with the |
4104 | * session daemon. | |
d6f42150 | 4105 | */ |
67e40797 DG |
4106 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4107 | const char *rundir) | |
d6f42150 DG |
4108 | { |
4109 | int ret; | |
67e40797 | 4110 | char path[PATH_MAX]; |
d6f42150 | 4111 | |
67e40797 | 4112 | switch (consumer_data->type) { |
7753dea8 | 4113 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4114 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4115 | break; |
4116 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4117 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4118 | break; |
4119 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4120 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4121 | break; |
4122 | default: | |
4123 | ERR("Consumer type unknown"); | |
4124 | ret = -EINVAL; | |
4125 | goto error; | |
d6f42150 DG |
4126 | } |
4127 | ||
67e40797 DG |
4128 | DBG2("Creating consumer directory: %s", path); |
4129 | ||
3bd1e081 | 4130 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4131 | if (ret < 0) { |
6beb2242 | 4132 | if (errno != EEXIST) { |
3bd1e081 | 4133 | ERR("Failed to create %s", path); |
6beb2242 DG |
4134 | goto error; |
4135 | } | |
4136 | ret = 0; | |
d6f42150 DG |
4137 | } |
4138 | ||
4139 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4140 | consumer_data->err_sock = |
4141 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4142 | if (consumer_data->err_sock < 0) { | |
4143 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4144 | ret = -1; |
4145 | goto error; | |
4146 | } | |
4147 | ||
4148 | /* File permission MUST be 660 */ | |
3bd1e081 | 4149 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4150 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4151 | if (ret < 0) { |
3bd1e081 | 4152 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4153 | PERROR("chmod"); |
d6f42150 DG |
4154 | goto error; |
4155 | } | |
4156 | ||
4157 | error: | |
4158 | return ret; | |
4159 | } | |
4160 | ||
fac6795d | 4161 | /* |
d063d709 | 4162 | * Signal handler for the daemon |
cf3af59e | 4163 | * |
54d01ffb DG |
4164 | * Simply stop all worker threads, leaving main() return gracefully after |
4165 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4166 | */ |
4167 | static void sighandler(int sig) | |
4168 | { | |
4169 | switch (sig) { | |
cf3af59e | 4170 | case SIGPIPE: |
3cede4fe | 4171 | DBG("SIGPIPE caugth"); |
cf3af59e MD |
4172 | return; |
4173 | case SIGINT: | |
3cede4fe | 4174 | DBG("SIGINT caugth"); |
cf3af59e MD |
4175 | stop_threads(); |
4176 | break; | |
4177 | case SIGTERM: | |
3cede4fe | 4178 | DBG("SIGTERM caugth"); |
cf3af59e MD |
4179 | stop_threads(); |
4180 | break; | |
4181 | default: | |
4182 | break; | |
fac6795d | 4183 | } |
fac6795d DG |
4184 | } |
4185 | ||
4186 | /* | |
d063d709 | 4187 | * Setup signal handler for : |
1d4b027a | 4188 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4189 | */ |
1d4b027a | 4190 | static int set_signal_handler(void) |
fac6795d | 4191 | { |
1d4b027a DG |
4192 | int ret = 0; |
4193 | struct sigaction sa; | |
4194 | sigset_t sigset; | |
fac6795d | 4195 | |
1d4b027a DG |
4196 | if ((ret = sigemptyset(&sigset)) < 0) { |
4197 | perror("sigemptyset"); | |
4198 | return ret; | |
4199 | } | |
d6f42150 | 4200 | |
1d4b027a DG |
4201 | sa.sa_handler = sighandler; |
4202 | sa.sa_mask = sigset; | |
4203 | sa.sa_flags = 0; | |
4204 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4205 | perror("sigaction"); | |
4206 | return ret; | |
d6f42150 DG |
4207 | } |
4208 | ||
1d4b027a DG |
4209 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4210 | perror("sigaction"); | |
4211 | return ret; | |
d6f42150 | 4212 | } |
aaf26714 | 4213 | |
1d4b027a DG |
4214 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4215 | perror("sigaction"); | |
4216 | return ret; | |
8c0faa1d DG |
4217 | } |
4218 | ||
1d4b027a DG |
4219 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4220 | ||
4221 | return ret; | |
fac6795d DG |
4222 | } |
4223 | ||
f3ed775e | 4224 | /* |
d063d709 DG |
4225 | * Set open files limit to unlimited. This daemon can open a large number of |
4226 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4227 | */ |
4228 | static void set_ulimit(void) | |
4229 | { | |
4230 | int ret; | |
4231 | struct rlimit lim; | |
4232 | ||
a88df331 | 4233 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4234 | lim.rlim_cur = 65535; |
4235 | lim.rlim_max = 65535; | |
4236 | ||
4237 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4238 | if (ret < 0) { | |
4239 | perror("failed to set open files limit"); | |
4240 | } | |
4241 | } | |
4242 | ||
fac6795d DG |
4243 | /* |
4244 | * main | |
4245 | */ | |
4246 | int main(int argc, char **argv) | |
4247 | { | |
fac6795d DG |
4248 | int ret = 0; |
4249 | void *status; | |
b082db07 | 4250 | const char *home_path; |
fac6795d | 4251 | |
f6a9efaa DG |
4252 | rcu_register_thread(); |
4253 | ||
273ea72c | 4254 | /* Create thread quit pipe */ |
cf3af59e MD |
4255 | if ((ret = init_thread_quit_pipe()) < 0) { |
4256 | goto error; | |
273ea72c DG |
4257 | } |
4258 | ||
7753dea8 | 4259 | setup_consumerd_path(); |
fb09408a | 4260 | |
fac6795d DG |
4261 | /* Parse arguments */ |
4262 | progname = argv[0]; | |
4263 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4264 | goto error; |
fac6795d DG |
4265 | } |
4266 | ||
4267 | /* Daemonize */ | |
4268 | if (opt_daemon) { | |
53094c05 DG |
4269 | ret = daemon(0, 0); |
4270 | if (ret < 0) { | |
4271 | perror("daemon"); | |
cf3af59e | 4272 | goto error; |
53094c05 | 4273 | } |
fac6795d DG |
4274 | } |
4275 | ||
4276 | /* Check if daemon is UID = 0 */ | |
4277 | is_root = !getuid(); | |
4278 | ||
fac6795d | 4279 | if (is_root) { |
990570ed | 4280 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4281 | |
4282 | /* Create global run dir with root access */ | |
4283 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4284 | if (ret < 0) { |
cf3af59e | 4285 | goto error; |
d6f42150 DG |
4286 | } |
4287 | ||
fac6795d | 4288 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4289 | snprintf(apps_unix_sock_path, PATH_MAX, |
4290 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4291 | } |
4292 | ||
4293 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4294 | snprintf(client_unix_sock_path, PATH_MAX, |
4295 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4296 | } | |
0fdd1e2c DG |
4297 | |
4298 | /* Set global SHM for ust */ | |
4299 | if (strlen(wait_shm_path) == 0) { | |
4300 | snprintf(wait_shm_path, PATH_MAX, | |
4301 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4302 | } | |
67e40797 DG |
4303 | |
4304 | /* Setup kernel consumerd path */ | |
4305 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4306 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4307 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4308 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4309 | |
4310 | DBG2("Kernel consumer err path: %s", | |
4311 | kconsumer_data.err_unix_sock_path); | |
4312 | DBG2("Kernel consumer cmd path: %s", | |
4313 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4314 | } else { |
b082db07 DG |
4315 | home_path = get_home_dir(); |
4316 | if (home_path == NULL) { | |
273ea72c DG |
4317 | /* TODO: Add --socket PATH option */ |
4318 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4319 | ret = -EPERM; |
4320 | goto error; | |
b082db07 DG |
4321 | } |
4322 | ||
67e40797 DG |
4323 | /* |
4324 | * Create rundir from home path. This will create something like | |
4325 | * $HOME/.lttng | |
4326 | */ | |
990570ed | 4327 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4328 | if (ret < 0) { |
4329 | ret = -ENOMEM; | |
4330 | goto error; | |
4331 | } | |
4332 | ||
4333 | ret = create_lttng_rundir(rundir); | |
4334 | if (ret < 0) { | |
4335 | goto error; | |
4336 | } | |
4337 | ||
fac6795d | 4338 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4339 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4340 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4341 | } |
4342 | ||
4343 | /* Set the cli tool unix socket path */ | |
4344 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4345 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4346 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4347 | } |
0fdd1e2c DG |
4348 | |
4349 | /* Set global SHM for ust */ | |
4350 | if (strlen(wait_shm_path) == 0) { | |
4351 | snprintf(wait_shm_path, PATH_MAX, | |
4352 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4353 | } | |
fac6795d DG |
4354 | } |
4355 | ||
847177cd DG |
4356 | DBG("Client socket path %s", client_unix_sock_path); |
4357 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4358 | DBG("LTTng run directory path: %s", rundir); |
4359 | ||
4360 | /* 32 bits consumerd path setup */ | |
4361 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4362 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4363 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4364 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4365 | |
4366 | DBG2("UST consumer 32 bits err path: %s", | |
4367 | ustconsumer32_data.err_unix_sock_path); | |
4368 | DBG2("UST consumer 32 bits cmd path: %s", | |
4369 | ustconsumer32_data.cmd_unix_sock_path); | |
4370 | ||
4371 | /* 64 bits consumerd path setup */ | |
4372 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4373 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4374 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4375 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4376 | |
4377 | DBG2("UST consumer 64 bits err path: %s", | |
4378 | ustconsumer64_data.err_unix_sock_path); | |
4379 | DBG2("UST consumer 64 bits cmd path: %s", | |
4380 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4381 | |
273ea72c | 4382 | /* |
7d8234d9 | 4383 | * See if daemon already exist. |
fac6795d | 4384 | */ |
7d8234d9 | 4385 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4386 | ERR("Already running daemon.\n"); |
273ea72c | 4387 | /* |
cf3af59e MD |
4388 | * We do not goto exit because we must not cleanup() |
4389 | * because a daemon is already running. | |
ab118b20 | 4390 | */ |
cf3af59e | 4391 | goto error; |
a88df331 DG |
4392 | } |
4393 | ||
54d01ffb | 4394 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4395 | |
4396 | /* | |
4397 | * These actions must be executed as root. We do that *after* setting up | |
4398 | * the sockets path because we MUST make the check for another daemon using | |
4399 | * those paths *before* trying to set the kernel consumer sockets and init | |
4400 | * kernel tracer. | |
4401 | */ | |
4402 | if (is_root) { | |
67e40797 | 4403 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4404 | if (ret < 0) { |
4405 | goto exit; | |
4406 | } | |
4407 | ||
a88df331 | 4408 | /* Setup kernel tracer */ |
4fba7219 DG |
4409 | if (!opt_no_kernel) { |
4410 | init_kernel_tracer(); | |
4411 | } | |
a88df331 DG |
4412 | |
4413 | /* Set ulimit for open files */ | |
4414 | set_ulimit(); | |
fac6795d DG |
4415 | } |
4416 | ||
67e40797 DG |
4417 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4418 | if (ret < 0) { | |
4419 | goto exit; | |
4420 | } | |
4421 | ||
4422 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4423 | if (ret < 0) { | |
4424 | goto exit; | |
4425 | } | |
4426 | ||
cf3af59e MD |
4427 | if ((ret = set_signal_handler()) < 0) { |
4428 | goto exit; | |
fac6795d DG |
4429 | } |
4430 | ||
d6f42150 | 4431 | /* Setup the needed unix socket */ |
cf3af59e MD |
4432 | if ((ret = init_daemon_socket()) < 0) { |
4433 | goto exit; | |
fac6795d DG |
4434 | } |
4435 | ||
4436 | /* Set credentials to socket */ | |
be040666 | 4437 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4438 | goto exit; |
fac6795d DG |
4439 | } |
4440 | ||
5b8719f5 DG |
4441 | /* Get parent pid if -S, --sig-parent is specified. */ |
4442 | if (opt_sig_parent) { | |
4443 | ppid = getppid(); | |
4444 | } | |
4445 | ||
7a485870 | 4446 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4447 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4448 | goto exit; | |
7a485870 DG |
4449 | } |
4450 | ||
099e26bd DG |
4451 | /* Setup the thread apps communication pipe. */ |
4452 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4453 | goto exit; | |
4454 | } | |
4455 | ||
4456 | /* Init UST command queue. */ | |
4457 | cds_wfq_init(&ust_cmd_queue.queue); | |
4458 | ||
f6a9efaa DG |
4459 | /* Init UST app hash table */ |
4460 | ust_app_ht_alloc(); | |
4461 | ||
273ea72c | 4462 | /* |
54d01ffb DG |
4463 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4464 | * statically declared in session.c | |
273ea72c | 4465 | */ |
54d01ffb | 4466 | session_list_ptr = session_get_list(); |
b5541356 | 4467 | |
5eb91c98 DG |
4468 | /* Set up max poll set size */ |
4469 | lttng_poll_set_max_size(); | |
4470 | ||
cf3af59e | 4471 | /* Create thread to manage the client socket */ |
099e26bd DG |
4472 | ret = pthread_create(&client_thread, NULL, |
4473 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4474 | if (ret != 0) { |
099e26bd | 4475 | perror("pthread_create clients"); |
cf3af59e MD |
4476 | goto exit_client; |
4477 | } | |
fac6795d | 4478 | |
099e26bd DG |
4479 | /* Create thread to dispatch registration */ |
4480 | ret = pthread_create(&dispatch_thread, NULL, | |
4481 | thread_dispatch_ust_registration, (void *) NULL); | |
4482 | if (ret != 0) { | |
4483 | perror("pthread_create dispatch"); | |
4484 | goto exit_dispatch; | |
4485 | } | |
4486 | ||
4487 | /* Create thread to manage application registration. */ | |
4488 | ret = pthread_create(®_apps_thread, NULL, | |
4489 | thread_registration_apps, (void *) NULL); | |
4490 | if (ret != 0) { | |
4491 | perror("pthread_create registration"); | |
4492 | goto exit_reg_apps; | |
4493 | } | |
4494 | ||
cf3af59e | 4495 | /* Create thread to manage application socket */ |
54d01ffb DG |
4496 | ret = pthread_create(&apps_thread, NULL, |
4497 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4498 | if (ret != 0) { |
099e26bd | 4499 | perror("pthread_create apps"); |
cf3af59e MD |
4500 | goto exit_apps; |
4501 | } | |
fac6795d | 4502 | |
cf3af59e | 4503 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4504 | ret = pthread_create(&kernel_thread, NULL, |
4505 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4506 | if (ret != 0) { |
099e26bd | 4507 | perror("pthread_create kernel"); |
cf3af59e MD |
4508 | goto exit_kernel; |
4509 | } | |
7a485870 | 4510 | |
cf3af59e MD |
4511 | ret = pthread_join(kernel_thread, &status); |
4512 | if (ret != 0) { | |
4513 | perror("pthread_join"); | |
4514 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4515 | } |
4516 | ||
cf3af59e MD |
4517 | exit_kernel: |
4518 | ret = pthread_join(apps_thread, &status); | |
4519 | if (ret != 0) { | |
4520 | perror("pthread_join"); | |
4521 | goto error; /* join error, exit without cleanup */ | |
4522 | } | |
fac6795d | 4523 | |
cf3af59e | 4524 | exit_apps: |
099e26bd DG |
4525 | ret = pthread_join(reg_apps_thread, &status); |
4526 | if (ret != 0) { | |
4527 | perror("pthread_join"); | |
4528 | goto error; /* join error, exit without cleanup */ | |
4529 | } | |
4530 | ||
4531 | exit_reg_apps: | |
4532 | ret = pthread_join(dispatch_thread, &status); | |
4533 | if (ret != 0) { | |
4534 | perror("pthread_join"); | |
4535 | goto error; /* join error, exit without cleanup */ | |
4536 | } | |
4537 | ||
4538 | exit_dispatch: | |
cf3af59e MD |
4539 | ret = pthread_join(client_thread, &status); |
4540 | if (ret != 0) { | |
4541 | perror("pthread_join"); | |
4542 | goto error; /* join error, exit without cleanup */ | |
4543 | } | |
4544 | ||
3bd1e081 | 4545 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4546 | if (ret != 0) { |
3bd1e081 | 4547 | perror("join_consumer"); |
cf3af59e MD |
4548 | goto error; /* join error, exit without cleanup */ |
4549 | } | |
a88df331 | 4550 | |
cf3af59e | 4551 | exit_client: |
a88df331 | 4552 | exit: |
cf3af59e MD |
4553 | /* |
4554 | * cleanup() is called when no other thread is running. | |
4555 | */ | |
f6a9efaa | 4556 | rcu_thread_online(); |
cf3af59e | 4557 | cleanup(); |
f6a9efaa DG |
4558 | rcu_thread_offline(); |
4559 | rcu_unregister_thread(); | |
67e40797 | 4560 | if (!ret) { |
cf3af59e | 4561 | exit(EXIT_SUCCESS); |
67e40797 | 4562 | } |
cf3af59e | 4563 | error: |
5e16da05 | 4564 | exit(EXIT_FAILURE); |
fac6795d | 4565 | } |