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 | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
8c0faa1d | 24 | #include <semaphore.h> |
fac6795d DG |
25 | #include <signal.h> |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c DG |
35 | #include <sys/wait.h> |
36 | #include <urcu/futex.h> | |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.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" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
fac6795d | 57 | |
ebaeda94 MD |
58 | #define CONSUMERD_FILE "lttng-consumerd" |
59 | ||
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 80 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d | 92 | static int opt_daemon; |
4fba7219 | 93 | static int opt_no_kernel; |
fac6795d | 94 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 95 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 96 | static char *rundir; |
3bd1e081 MD |
97 | |
98 | /* Consumer daemon specific control data */ | |
99 | static struct consumer_data kconsumer_data = { | |
100 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
113 | }; |
114 | ||
099e26bd | 115 | static int dispatch_thread_exit; |
fac6795d | 116 | |
54d01ffb DG |
117 | /* Global application Unix socket path */ |
118 | static char apps_unix_sock_path[PATH_MAX]; | |
119 | /* Global client Unix socket path */ | |
120 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
121 | /* global wait shm path for UST */ |
122 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 123 | |
1d4b027a | 124 | /* Sockets and FDs */ |
d6f42150 DG |
125 | static int client_sock; |
126 | static int apps_sock; | |
20fe2104 | 127 | static int kernel_tracer_fd; |
7a485870 | 128 | static int kernel_poll_pipe[2]; |
1d4b027a | 129 | |
273ea72c DG |
130 | /* |
131 | * Quit pipe for all threads. This permits a single cancellation point | |
132 | * for all threads when receiving an event on the pipe. | |
133 | */ | |
134 | static int thread_quit_pipe[2]; | |
135 | ||
099e26bd DG |
136 | /* |
137 | * This pipe is used to inform the thread managing application communication | |
138 | * that a command is queued and ready to be processed. | |
139 | */ | |
140 | static int apps_cmd_pipe[2]; | |
141 | ||
1d4b027a | 142 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 143 | static pthread_t apps_thread; |
099e26bd | 144 | static pthread_t reg_apps_thread; |
1d4b027a | 145 | static pthread_t client_thread; |
7a485870 | 146 | static pthread_t kernel_thread; |
099e26bd | 147 | static pthread_t dispatch_thread; |
5eb91c98 | 148 | |
fac6795d | 149 | |
099e26bd DG |
150 | /* |
151 | * UST registration command queue. This queue is tied with a futex and uses a N | |
152 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
153 | * | |
154 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
155 | * this queue and the wait/wake scheme. | |
156 | */ | |
157 | static struct ust_cmd_queue ust_cmd_queue; | |
158 | ||
b5541356 DG |
159 | /* |
160 | * Pointer initialized before thread creation. | |
161 | * | |
162 | * This points to the tracing session list containing the session count and a | |
163 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
164 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 165 | * |
d063d709 | 166 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 167 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
168 | */ |
169 | static struct ltt_session_list *session_list_ptr; | |
170 | ||
7753dea8 MD |
171 | int ust_consumerd64_fd = -1; |
172 | int ust_consumerd32_fd = -1; | |
173 | ||
fb6f1fa2 YB |
174 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
175 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
176 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
177 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
178 | |
179 | static | |
7753dea8 | 180 | void setup_consumerd_path(void) |
fb09408a | 181 | { |
fc7a59ce | 182 | const char *bin, *libdir; |
fb09408a | 183 | |
7753dea8 MD |
184 | /* |
185 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
186 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
187 | * has not been defined. | |
7753dea8 | 188 | */ |
ebaeda94 | 189 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
190 | if (!consumerd32_bin[0]) { |
191 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
192 | } |
193 | if (!consumerd32_libdir[0]) { | |
194 | consumerd32_libdir = INSTALL_LIB_PATH; | |
195 | } | |
196 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
197 | if (!consumerd64_bin[0]) { |
198 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 199 | } |
ebaeda94 MD |
200 | if (!consumerd64_libdir[0]) { |
201 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
202 | } |
203 | #else | |
204 | #error "Unknown bitness" | |
205 | #endif | |
206 | ||
fb09408a MD |
207 | /* |
208 | * runtime env. var. overrides the build default. | |
209 | */ | |
fc7a59ce AM |
210 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
211 | if (bin) { | |
212 | consumerd32_bin = bin; | |
7753dea8 | 213 | } |
fc7a59ce AM |
214 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
215 | if (bin) { | |
216 | consumerd64_bin = bin; | |
ebaeda94 | 217 | } |
72f579ee | 218 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
219 | if (libdir) { |
220 | consumerd32_libdir = libdir; | |
221 | } | |
72f579ee | 222 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
223 | if (libdir) { |
224 | consumerd64_libdir = libdir; | |
fb09408a MD |
225 | } |
226 | } | |
227 | ||
5eb91c98 DG |
228 | /* |
229 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
230 | */ | |
231 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
232 | unsigned int size) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | if (events == NULL || size == 0) { | |
237 | ret = -1; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
242 | if (ret < 0) { | |
243 | goto error; | |
244 | } | |
245 | ||
246 | /* Add quit pipe */ | |
247 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
248 | if (ret < 0) { | |
249 | goto error; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | ||
254 | error: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Check if the thread quit pipe was triggered. | |
260 | * | |
261 | * Return 1 if it was triggered else 0; | |
262 | */ | |
263 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
264 | { | |
265 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
266 | return 1; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
0fdd1e2c DG |
272 | /* |
273 | * Return group ID of the tracing group or -1 if not found. | |
274 | */ | |
996b65c8 MD |
275 | static gid_t allowed_group(void) |
276 | { | |
277 | struct group *grp; | |
278 | ||
274e143b MD |
279 | if (opt_tracing_group) { |
280 | grp = getgrnam(opt_tracing_group); | |
281 | } else { | |
282 | grp = getgrnam(default_tracing_group); | |
283 | } | |
996b65c8 MD |
284 | if (!grp) { |
285 | return -1; | |
286 | } else { | |
287 | return grp->gr_gid; | |
288 | } | |
289 | } | |
290 | ||
273ea72c | 291 | /* |
5eb91c98 | 292 | * Init thread quit pipe. |
273ea72c DG |
293 | * |
294 | * Return -1 on error or 0 if all pipes are created. | |
295 | */ | |
296 | static int init_thread_quit_pipe(void) | |
297 | { | |
730389d9 | 298 | int ret, i; |
273ea72c | 299 | |
730389d9 | 300 | ret = pipe(thread_quit_pipe); |
273ea72c | 301 | if (ret < 0) { |
730389d9 | 302 | PERROR("thread quit pipe"); |
273ea72c DG |
303 | goto error; |
304 | } | |
305 | ||
730389d9 DG |
306 | for (i = 0; i < 2; i++) { |
307 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
308 | if (ret < 0) { | |
309 | PERROR("fcntl"); | |
310 | goto error; | |
311 | } | |
312 | } | |
313 | ||
273ea72c DG |
314 | error: |
315 | return ret; | |
316 | } | |
317 | ||
fac6795d | 318 | /* |
d063d709 DG |
319 | * Complete teardown of a kernel session. This free all data structure related |
320 | * to a kernel session and update counter. | |
fac6795d | 321 | */ |
1d4b027a | 322 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 323 | { |
8f7a84dd | 324 | if (!session->kernel_session) { |
99bab54f | 325 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 326 | return; |
8f7a84dd DG |
327 | } |
328 | ||
84ea9c99 | 329 | DBG("Tearing down kernel session"); |
d9800920 | 330 | |
84ea9c99 MD |
331 | /* |
332 | * If a custom kernel consumer was registered, close the socket before | |
333 | * tearing down the complete kernel session structure | |
334 | */ | |
335 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
336 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 337 | } |
84ea9c99 MD |
338 | |
339 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
340 | } |
341 | ||
f6a9efaa DG |
342 | /* |
343 | * Complete teardown of all UST sessions. This will free everything on his path | |
344 | * and destroy the core essence of all ust sessions :) | |
345 | */ | |
346 | static void teardown_ust_session(struct ltt_session *session) | |
347 | { | |
84cd17c6 MD |
348 | int ret; |
349 | ||
8f7a84dd | 350 | if (!session->ust_session) { |
99bab54f | 351 | DBG3("No UST session when tearing down session"); |
f470a390 | 352 | return; |
8f7a84dd DG |
353 | } |
354 | ||
84ea9c99 | 355 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 356 | |
84cd17c6 MD |
357 | ret = ust_app_destroy_trace_all(session->ust_session); |
358 | if (ret) { | |
359 | ERR("Error in ust_app_destroy_trace_all"); | |
360 | } | |
8f7a84dd | 361 | |
f6a9efaa DG |
362 | trace_ust_destroy_session(session->ust_session); |
363 | } | |
364 | ||
099e26bd DG |
365 | /* |
366 | * Stop all threads by closing the thread quit pipe. | |
367 | */ | |
cf3af59e MD |
368 | static void stop_threads(void) |
369 | { | |
5eb91c98 DG |
370 | int ret; |
371 | ||
cf3af59e MD |
372 | /* Stopping all threads */ |
373 | DBG("Terminating all threads"); | |
54d01ffb | 374 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
375 | if (ret < 0) { |
376 | ERR("write error on thread quit pipe"); | |
377 | } | |
378 | ||
099e26bd DG |
379 | /* Dispatch thread */ |
380 | dispatch_thread_exit = 1; | |
381 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
382 | } |
383 | ||
fac6795d | 384 | /* |
d063d709 | 385 | * Cleanup the daemon |
fac6795d | 386 | */ |
cf3af59e | 387 | static void cleanup(void) |
fac6795d | 388 | { |
1d4b027a DG |
389 | int ret; |
390 | char *cmd; | |
af9737e9 | 391 | struct ltt_session *sess, *stmp; |
fac6795d | 392 | |
1d4b027a | 393 | DBG("Cleaning up"); |
e07ae692 | 394 | |
67e40797 DG |
395 | DBG("Removing %s directory", rundir); |
396 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
397 | if (ret < 0) { | |
398 | ERR("asprintf failed. Something is really wrong!"); | |
399 | } | |
5461b305 | 400 | |
67e40797 DG |
401 | /* Remove lttng run directory */ |
402 | ret = system(cmd); | |
403 | if (ret < 0) { | |
404 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 405 | } |
67e40797 | 406 | free(cmd); |
5461b305 | 407 | |
99bab54f | 408 | DBG("Cleaning up all sessions"); |
fac6795d | 409 | |
b5541356 | 410 | /* Destroy session list mutex */ |
273ea72c DG |
411 | if (session_list_ptr != NULL) { |
412 | pthread_mutex_destroy(&session_list_ptr->lock); | |
413 | ||
414 | /* Cleanup ALL session */ | |
54d01ffb DG |
415 | cds_list_for_each_entry_safe(sess, stmp, |
416 | &session_list_ptr->head, list) { | |
273ea72c | 417 | teardown_kernel_session(sess); |
f6a9efaa DG |
418 | teardown_ust_session(sess); |
419 | free(sess); | |
273ea72c DG |
420 | } |
421 | } | |
422 | ||
099e26bd | 423 | DBG("Closing all UST sockets"); |
56fff090 | 424 | ust_app_clean_list(); |
099e26bd | 425 | |
3bd1e081 | 426 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 427 | |
4fba7219 DG |
428 | if (is_root && !opt_no_kernel) { |
429 | DBG2("Closing kernel fd"); | |
430 | close(kernel_tracer_fd); | |
2f50c8a3 | 431 | DBG("Unloading kernel modules"); |
096102bd | 432 | modprobe_remove_lttng_all(); |
2f50c8a3 | 433 | } |
5eb91c98 DG |
434 | |
435 | close(thread_quit_pipe[0]); | |
436 | close(thread_quit_pipe[1]); | |
421cb601 DG |
437 | |
438 | /* <fun> */ | |
f56a39af | 439 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
440 | "Matthew, BEET driven development works!%c[%dm", |
441 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
442 | /* </fun> */ | |
fac6795d DG |
443 | } |
444 | ||
e065084a | 445 | /* |
d063d709 | 446 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 447 | * |
d063d709 | 448 | * Return lttcomm error code. |
e065084a DG |
449 | */ |
450 | static int send_unix_sock(int sock, void *buf, size_t len) | |
451 | { | |
452 | /* Check valid length */ | |
453 | if (len <= 0) { | |
454 | return -1; | |
455 | } | |
456 | ||
457 | return lttcomm_send_unix_sock(sock, buf, len); | |
458 | } | |
459 | ||
5461b305 | 460 | /* |
d063d709 | 461 | * Free memory of a command context structure. |
5461b305 | 462 | */ |
a2fb29a5 | 463 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 464 | { |
a2fb29a5 DG |
465 | DBG("Clean command context structure"); |
466 | if (*cmd_ctx) { | |
467 | if ((*cmd_ctx)->llm) { | |
468 | free((*cmd_ctx)->llm); | |
5461b305 | 469 | } |
a2fb29a5 DG |
470 | if ((*cmd_ctx)->lsm) { |
471 | free((*cmd_ctx)->lsm); | |
5461b305 | 472 | } |
a2fb29a5 DG |
473 | free(*cmd_ctx); |
474 | *cmd_ctx = NULL; | |
5461b305 DG |
475 | } |
476 | } | |
477 | ||
f3ed775e | 478 | /* |
d063d709 | 479 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 480 | */ |
2bdd86d4 | 481 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
482 | int sock, struct ltt_kernel_channel *channel, |
483 | uid_t uid, gid_t gid) | |
f3ed775e DG |
484 | { |
485 | int ret; | |
f3ed775e | 486 | struct ltt_kernel_stream *stream; |
3bd1e081 | 487 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 488 | |
3bd1e081 | 489 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 490 | channel->channel->name); |
f3ed775e | 491 | |
3bd1e081 MD |
492 | /* Send channel */ |
493 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
494 | lkm.u.channel.channel_key = channel->fd; | |
495 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
496 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 497 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 498 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 499 | if (ret < 0) { |
3bd1e081 | 500 | perror("send consumer channel"); |
f3ed775e DG |
501 | goto error; |
502 | } | |
503 | ||
3bd1e081 | 504 | /* Send streams */ |
7a485870 | 505 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
506 | if (!stream->fd) { |
507 | continue; | |
508 | } | |
509 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
510 | lkm.u.stream.channel_key = channel->fd; | |
511 | lkm.u.stream.stream_key = stream->fd; | |
512 | lkm.u.stream.state = stream->state; | |
513 | lkm.u.stream.output = channel->channel->attr.output; | |
514 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
515 | lkm.u.stream.uid = uid; |
516 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
517 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
518 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
519 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
520 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
521 | if (ret < 0) { | |
522 | perror("send consumer stream"); | |
523 | goto error; | |
524 | } | |
525 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
526 | if (ret < 0) { | |
527 | perror("send consumer stream ancillary data"); | |
528 | goto error; | |
f3ed775e DG |
529 | } |
530 | } | |
531 | ||
3bd1e081 | 532 | DBG("consumer channel streams sent"); |
f3ed775e DG |
533 | |
534 | return 0; | |
535 | ||
536 | error: | |
537 | return ret; | |
538 | } | |
539 | ||
540 | /* | |
d063d709 | 541 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 542 | */ |
2bdd86d4 | 543 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 544 | struct ltt_kernel_session *session) |
f3ed775e DG |
545 | { |
546 | int ret; | |
547 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
548 | struct lttcomm_consumer_msg lkm; |
549 | int sock = session->consumer_fd; | |
7a485870 DG |
550 | |
551 | DBG("Sending metadata stream fd"); | |
552 | ||
2bdd86d4 | 553 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 554 | if (session->consumer_fd == 0) { |
3bd1e081 | 555 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
556 | } |
557 | ||
7a485870 | 558 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
559 | /* Send metadata channel fd */ |
560 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
561 | lkm.u.channel.channel_key = session->metadata->fd; | |
562 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
563 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
564 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
565 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
566 | if (ret < 0) { | |
567 | perror("send consumer channel"); | |
568 | goto error; | |
569 | } | |
570 | ||
571 | /* Send metadata stream fd */ | |
572 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
573 | lkm.u.stream.channel_key = session->metadata->fd; | |
574 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
575 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
576 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
577 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
578 | lkm.u.stream.uid = session->uid; |
579 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
580 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
581 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
582 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
583 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
584 | if (ret < 0) { | |
585 | perror("send consumer stream"); | |
586 | goto error; | |
587 | } | |
588 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 589 | if (ret < 0) { |
3bd1e081 | 590 | perror("send consumer stream"); |
7a485870 DG |
591 | goto error; |
592 | } | |
593 | } | |
f3ed775e | 594 | |
f3ed775e | 595 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
596 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
597 | session->uid, session->gid); | |
2bdd86d4 MD |
598 | if (ret < 0) { |
599 | goto error; | |
600 | } | |
601 | } | |
602 | ||
603 | DBG("consumer fds (metadata and channel streams) sent"); | |
604 | ||
605 | return 0; | |
606 | ||
607 | error: | |
608 | return ret; | |
609 | } | |
610 | ||
fac6795d | 611 | /* |
0fdd1e2c | 612 | * Notify UST applications using the shm mmap futex. |
fac6795d | 613 | */ |
0fdd1e2c | 614 | static int notify_ust_apps(int active) |
fac6795d | 615 | { |
0fdd1e2c | 616 | char *wait_shm_mmap; |
fac6795d | 617 | |
0fdd1e2c | 618 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 619 | |
0fdd1e2c DG |
620 | /* See shm.c for this call implying mmap, shm and futex calls */ |
621 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
622 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
623 | goto error; |
624 | } | |
625 | ||
0fdd1e2c DG |
626 | /* Wake waiting process */ |
627 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
628 | ||
629 | /* Apps notified successfully */ | |
630 | return 0; | |
fac6795d DG |
631 | |
632 | error: | |
0fdd1e2c | 633 | return -1; |
fac6795d DG |
634 | } |
635 | ||
e065084a | 636 | /* |
d063d709 DG |
637 | * Setup the outgoing data buffer for the response (llm) by allocating the |
638 | * right amount of memory and copying the original information from the lsm | |
639 | * structure. | |
ca95a216 | 640 | * |
d063d709 | 641 | * Return total size of the buffer pointed by buf. |
ca95a216 | 642 | */ |
5461b305 | 643 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 644 | { |
f3ed775e | 645 | int ret, buf_size; |
ca95a216 | 646 | |
f3ed775e | 647 | buf_size = size; |
5461b305 | 648 | |
ba7f0ae5 | 649 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 650 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 651 | perror("zmalloc"); |
5461b305 | 652 | ret = -ENOMEM; |
ca95a216 DG |
653 | goto error; |
654 | } | |
655 | ||
5461b305 DG |
656 | /* Copy common data */ |
657 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 658 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 659 | |
5461b305 DG |
660 | cmd_ctx->llm->data_size = size; |
661 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
662 | ||
ca95a216 DG |
663 | return buf_size; |
664 | ||
665 | error: | |
666 | return ret; | |
667 | } | |
668 | ||
7a485870 | 669 | /* |
5eb91c98 | 670 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 671 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 672 | */ |
5eb91c98 | 673 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 674 | { |
5eb91c98 | 675 | int ret; |
7a485870 DG |
676 | struct ltt_session *session; |
677 | struct ltt_kernel_channel *channel; | |
678 | ||
5eb91c98 | 679 | DBG("Updating kernel poll set"); |
7a485870 | 680 | |
54d01ffb | 681 | session_lock_list(); |
b5541356 | 682 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 683 | session_lock(session); |
7a485870 | 684 | if (session->kernel_session == NULL) { |
54d01ffb | 685 | session_unlock(session); |
7a485870 DG |
686 | continue; |
687 | } | |
7a485870 | 688 | |
54d01ffb DG |
689 | cds_list_for_each_entry(channel, |
690 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
691 | /* Add channel fd to the kernel poll set */ |
692 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
693 | if (ret < 0) { | |
54d01ffb | 694 | session_unlock(session); |
5eb91c98 DG |
695 | goto error; |
696 | } | |
697 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 698 | } |
54d01ffb | 699 | session_unlock(session); |
7a485870 | 700 | } |
54d01ffb | 701 | session_unlock_list(); |
7a485870 | 702 | |
5eb91c98 | 703 | return 0; |
7a485870 DG |
704 | |
705 | error: | |
54d01ffb | 706 | session_unlock_list(); |
7a485870 DG |
707 | return -1; |
708 | } | |
709 | ||
710 | /* | |
54d01ffb | 711 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 712 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 713 | * |
d063d709 | 714 | * Useful for CPU hotplug feature. |
7a485870 | 715 | */ |
2bdd86d4 | 716 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
717 | { |
718 | int ret = 0; | |
719 | struct ltt_session *session; | |
720 | struct ltt_kernel_channel *channel; | |
721 | ||
722 | DBG("Updating kernel streams for channel fd %d", fd); | |
723 | ||
54d01ffb | 724 | session_lock_list(); |
b5541356 | 725 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 726 | session_lock(session); |
7a485870 | 727 | if (session->kernel_session == NULL) { |
54d01ffb | 728 | session_unlock(session); |
7a485870 DG |
729 | continue; |
730 | } | |
d9800920 DG |
731 | |
732 | /* This is not suppose to be 0 but this is an extra security check */ | |
733 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 734 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
735 | } |
736 | ||
5eb91c98 DG |
737 | cds_list_for_each_entry(channel, |
738 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
739 | if (channel->fd == fd) { |
740 | DBG("Channel found, updating kernel streams"); | |
741 | ret = kernel_open_channel_stream(channel); | |
742 | if (ret < 0) { | |
b3c750d2 | 743 | goto error; |
7a485870 | 744 | } |
d9800920 | 745 | |
7a485870 | 746 | /* |
5eb91c98 DG |
747 | * Have we already sent fds to the consumer? If yes, it means |
748 | * that tracing is started so it is safe to send our updated | |
749 | * stream fds. | |
7a485870 | 750 | */ |
3bd1e081 | 751 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 752 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
753 | session->kernel_session->consumer_fd, channel, |
754 | session->uid, session->gid); | |
7a485870 | 755 | if (ret < 0) { |
b3c750d2 | 756 | goto error; |
7a485870 DG |
757 | } |
758 | } | |
b3c750d2 | 759 | goto error; |
7a485870 DG |
760 | } |
761 | } | |
54d01ffb | 762 | session_unlock(session); |
7a485870 | 763 | } |
54d01ffb | 764 | session_unlock_list(); |
b3c750d2 | 765 | return ret; |
7a485870 | 766 | |
b3c750d2 | 767 | error: |
54d01ffb DG |
768 | session_unlock(session); |
769 | session_unlock_list(); | |
7a485870 DG |
770 | return ret; |
771 | } | |
772 | ||
487cf67c DG |
773 | /* |
774 | * For each tracing session, update newly registered apps. | |
775 | */ | |
776 | static void update_ust_app(int app_sock) | |
777 | { | |
778 | struct ltt_session *sess, *stmp; | |
779 | ||
4ee14516 DG |
780 | session_lock_list(); |
781 | ||
487cf67c DG |
782 | /* For all tracing session(s) */ |
783 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 784 | session_lock(sess); |
421cb601 DG |
785 | if (sess->ust_session) { |
786 | ust_app_global_update(sess->ust_session, app_sock); | |
787 | } | |
4ee14516 | 788 | session_unlock(sess); |
487cf67c | 789 | } |
4ee14516 DG |
790 | |
791 | session_unlock_list(); | |
487cf67c DG |
792 | } |
793 | ||
7a485870 | 794 | /* |
d063d709 | 795 | * This thread manage event coming from the kernel. |
7a485870 | 796 | * |
d063d709 DG |
797 | * Features supported in this thread: |
798 | * -) CPU Hotplug | |
7a485870 DG |
799 | */ |
800 | static void *thread_manage_kernel(void *data) | |
801 | { | |
5eb91c98 DG |
802 | int ret, i, pollfd, update_poll_flag = 1; |
803 | uint32_t revents, nb_fd; | |
7a485870 | 804 | char tmp; |
5eb91c98 | 805 | struct lttng_poll_event events; |
7a485870 DG |
806 | |
807 | DBG("Thread manage kernel started"); | |
808 | ||
5eb91c98 DG |
809 | ret = create_thread_poll_set(&events, 2); |
810 | if (ret < 0) { | |
811 | goto error; | |
812 | } | |
813 | ||
814 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
815 | if (ret < 0) { | |
816 | goto error; | |
817 | } | |
818 | ||
7a485870 DG |
819 | while (1) { |
820 | if (update_poll_flag == 1) { | |
5f822d0a DG |
821 | /* |
822 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
823 | * quit pipe and the kernel pipe. | |
824 | */ | |
825 | events.nb_fd = 2; | |
826 | ||
5eb91c98 DG |
827 | ret = update_kernel_poll(&events); |
828 | if (ret < 0) { | |
7a485870 DG |
829 | goto error; |
830 | } | |
831 | update_poll_flag = 0; | |
832 | } | |
833 | ||
5eb91c98 DG |
834 | nb_fd = LTTNG_POLL_GETNB(&events); |
835 | ||
836 | DBG("Thread kernel polling on %d fds", nb_fd); | |
837 | ||
838 | /* Zeroed the poll events */ | |
839 | lttng_poll_reset(&events); | |
7a485870 DG |
840 | |
841 | /* Poll infinite value of time */ | |
88f2b785 | 842 | restart: |
5eb91c98 | 843 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 844 | if (ret < 0) { |
88f2b785 MD |
845 | /* |
846 | * Restart interrupted system call. | |
847 | */ | |
848 | if (errno == EINTR) { | |
849 | goto restart; | |
850 | } | |
7a485870 DG |
851 | goto error; |
852 | } else if (ret == 0) { | |
853 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
854 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
855 | "This should not have happened! Continuing..."); | |
7a485870 DG |
856 | continue; |
857 | } | |
858 | ||
5eb91c98 DG |
859 | for (i = 0; i < nb_fd; i++) { |
860 | /* Fetch once the poll data */ | |
861 | revents = LTTNG_POLL_GETEV(&events, i); | |
862 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 863 | |
5eb91c98 DG |
864 | /* Thread quit pipe has been closed. Killing thread. */ |
865 | ret = check_thread_quit_pipe(pollfd, revents); | |
866 | if (ret) { | |
867 | goto error; | |
868 | } | |
7a485870 | 869 | |
5eb91c98 DG |
870 | /* Check for data on kernel pipe */ |
871 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
872 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
873 | update_poll_flag = 1; | |
874 | continue; | |
875 | } else { | |
876 | /* | |
877 | * New CPU detected by the kernel. Adding kernel stream to | |
878 | * kernel session and updating the kernel consumer | |
879 | */ | |
880 | if (revents & LPOLLIN) { | |
2bdd86d4 | 881 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
882 | if (ret < 0) { |
883 | continue; | |
884 | } | |
885 | break; | |
886 | /* | |
887 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
888 | * and unregister kernel stream at this point. | |
889 | */ | |
7a485870 | 890 | } |
7a485870 DG |
891 | } |
892 | } | |
893 | } | |
894 | ||
895 | error: | |
896 | DBG("Kernel thread dying"); | |
273ea72c DG |
897 | close(kernel_poll_pipe[0]); |
898 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
899 | |
900 | lttng_poll_clean(&events); | |
901 | ||
7a485870 DG |
902 | return NULL; |
903 | } | |
904 | ||
1d4b027a | 905 | /* |
3bd1e081 | 906 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 907 | */ |
3bd1e081 | 908 | static void *thread_manage_consumer(void *data) |
1d4b027a | 909 | { |
5eb91c98 DG |
910 | int sock = 0, i, ret, pollfd; |
911 | uint32_t revents, nb_fd; | |
1d4b027a | 912 | enum lttcomm_return_code code; |
5eb91c98 | 913 | struct lttng_poll_event events; |
3bd1e081 | 914 | struct consumer_data *consumer_data = data; |
1d4b027a | 915 | |
3bd1e081 | 916 | DBG("[thread] Manage consumer started"); |
1d4b027a | 917 | |
3bd1e081 | 918 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
919 | if (ret < 0) { |
920 | goto error; | |
921 | } | |
922 | ||
5eb91c98 DG |
923 | /* |
924 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
925 | * Nothing more will be added to this poll set. | |
926 | */ | |
927 | ret = create_thread_poll_set(&events, 2); | |
928 | if (ret < 0) { | |
929 | goto error; | |
930 | } | |
273ea72c | 931 | |
3bd1e081 | 932 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
933 | if (ret < 0) { |
934 | goto error; | |
935 | } | |
936 | ||
937 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
938 | |
939 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 940 | restart: |
5eb91c98 | 941 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 942 | if (ret < 0) { |
88f2b785 MD |
943 | /* |
944 | * Restart interrupted system call. | |
945 | */ | |
946 | if (errno == EINTR) { | |
947 | goto restart; | |
948 | } | |
273ea72c DG |
949 | goto error; |
950 | } | |
951 | ||
5eb91c98 DG |
952 | for (i = 0; i < nb_fd; i++) { |
953 | /* Fetch once the poll data */ | |
954 | revents = LTTNG_POLL_GETEV(&events, i); | |
955 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
956 | ||
957 | /* Thread quit pipe has been closed. Killing thread. */ | |
958 | ret = check_thread_quit_pipe(pollfd, revents); | |
959 | if (ret) { | |
960 | goto error; | |
961 | } | |
962 | ||
963 | /* Event on the registration socket */ | |
3bd1e081 | 964 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 965 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 966 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
967 | goto error; |
968 | } | |
969 | } | |
273ea72c DG |
970 | } |
971 | ||
3bd1e081 | 972 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
973 | if (sock < 0) { |
974 | goto error; | |
975 | } | |
976 | ||
3bd1e081 | 977 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 978 | |
712ea556 | 979 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
980 | ret = lttcomm_recv_unix_sock(sock, &code, |
981 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
982 | if (ret <= 0) { |
983 | goto error; | |
984 | } | |
985 | ||
3bd1e081 MD |
986 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
987 | consumer_data->cmd_sock = | |
988 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
989 | if (consumer_data->cmd_sock < 0) { | |
990 | sem_post(&consumer_data->sem); | |
48842b30 | 991 | PERROR("consumer connect"); |
1d4b027a DG |
992 | goto error; |
993 | } | |
994 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
995 | sem_post(&consumer_data->sem); |
996 | DBG("consumer command socket ready"); | |
1d4b027a | 997 | } else { |
3bd1e081 | 998 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
999 | lttcomm_get_readable_code(-code)); |
1000 | goto error; | |
1001 | } | |
1002 | ||
54d01ffb | 1003 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1004 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1005 | if (ret < 0) { |
72079cae DG |
1006 | goto error; |
1007 | } | |
1008 | ||
5eb91c98 DG |
1009 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1010 | if (ret < 0) { | |
72079cae | 1011 | goto error; |
5eb91c98 DG |
1012 | } |
1013 | ||
1014 | /* Update number of fd */ | |
1015 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1016 | ||
1017 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1018 | restart_poll: |
5eb91c98 DG |
1019 | ret = lttng_poll_wait(&events, -1); |
1020 | if (ret < 0) { | |
88f2b785 MD |
1021 | /* |
1022 | * Restart interrupted system call. | |
1023 | */ | |
1024 | if (errno == EINTR) { | |
1025 | goto restart_poll; | |
1026 | } | |
72079cae DG |
1027 | goto error; |
1028 | } | |
1029 | ||
5eb91c98 DG |
1030 | for (i = 0; i < nb_fd; i++) { |
1031 | /* Fetch once the poll data */ | |
1032 | revents = LTTNG_POLL_GETEV(&events, i); | |
1033 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1034 | ||
1035 | /* Thread quit pipe has been closed. Killing thread. */ | |
1036 | ret = check_thread_quit_pipe(pollfd, revents); | |
1037 | if (ret) { | |
1038 | goto error; | |
1039 | } | |
1040 | ||
1041 | /* Event on the kconsumerd socket */ | |
1042 | if (pollfd == sock) { | |
1043 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1044 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1045 | goto error; |
1046 | } | |
1047 | } | |
1048 | } | |
1049 | ||
712ea556 | 1050 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1051 | ret = lttcomm_recv_unix_sock(sock, &code, |
1052 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1053 | if (ret <= 0) { |
3bd1e081 | 1054 | ERR("consumer closed the command socket"); |
712ea556 | 1055 | goto error; |
6f61d021 | 1056 | } |
1d4b027a | 1057 | |
3bd1e081 | 1058 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1059 | |
1d4b027a | 1060 | error: |
3bd1e081 MD |
1061 | DBG("consumer thread dying"); |
1062 | close(consumer_data->err_sock); | |
1063 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1064 | close(sock); |
273ea72c | 1065 | |
3bd1e081 MD |
1066 | unlink(consumer_data->err_unix_sock_path); |
1067 | unlink(consumer_data->cmd_unix_sock_path); | |
1068 | consumer_data->pid = 0; | |
1d4b027a | 1069 | |
5eb91c98 | 1070 | lttng_poll_clean(&events); |
0177d773 | 1071 | |
5eb91c98 | 1072 | return NULL; |
099e26bd DG |
1073 | } |
1074 | ||
099e26bd DG |
1075 | /* |
1076 | * This thread manage application communication. | |
1d4b027a DG |
1077 | */ |
1078 | static void *thread_manage_apps(void *data) | |
099e26bd | 1079 | { |
5eb91c98 DG |
1080 | int i, ret, pollfd; |
1081 | uint32_t revents, nb_fd; | |
099e26bd | 1082 | struct ust_command ust_cmd; |
5eb91c98 | 1083 | struct lttng_poll_event events; |
099e26bd DG |
1084 | |
1085 | DBG("[thread] Manage application started"); | |
1086 | ||
f6a9efaa DG |
1087 | rcu_register_thread(); |
1088 | rcu_thread_online(); | |
1089 | ||
5eb91c98 DG |
1090 | ret = create_thread_poll_set(&events, 2); |
1091 | if (ret < 0) { | |
1092 | goto error; | |
1093 | } | |
099e26bd | 1094 | |
5eb91c98 DG |
1095 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1096 | if (ret < 0) { | |
1097 | goto error; | |
1098 | } | |
099e26bd | 1099 | |
5eb91c98 DG |
1100 | while (1) { |
1101 | /* Zeroed the events structure */ | |
1102 | lttng_poll_reset(&events); | |
0177d773 | 1103 | |
5eb91c98 | 1104 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1105 | |
1106 | DBG("Apps thread polling on %d fds", nb_fd); | |
1107 | ||
1108 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1109 | restart: |
5eb91c98 | 1110 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1111 | if (ret < 0) { |
88f2b785 MD |
1112 | /* |
1113 | * Restart interrupted system call. | |
1114 | */ | |
1115 | if (errno == EINTR) { | |
1116 | goto restart; | |
1117 | } | |
099e26bd DG |
1118 | goto error; |
1119 | } | |
1120 | ||
5eb91c98 DG |
1121 | for (i = 0; i < nb_fd; i++) { |
1122 | /* Fetch once the poll data */ | |
1123 | revents = LTTNG_POLL_GETEV(&events, i); | |
1124 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1125 | ||
1126 | /* Thread quit pipe has been closed. Killing thread. */ | |
1127 | ret = check_thread_quit_pipe(pollfd, revents); | |
1128 | if (ret) { | |
099e26bd | 1129 | goto error; |
5eb91c98 | 1130 | } |
099e26bd | 1131 | |
5eb91c98 DG |
1132 | /* Inspect the apps cmd pipe */ |
1133 | if (pollfd == apps_cmd_pipe[0]) { | |
1134 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1135 | ERR("Apps command pipe error"); | |
0177d773 | 1136 | goto error; |
5eb91c98 DG |
1137 | } else if (revents & LPOLLIN) { |
1138 | /* Empty pipe */ | |
1139 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1140 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1141 | perror("read apps cmd pipe"); | |
1142 | goto error; | |
1143 | } | |
099e26bd | 1144 | |
5eb91c98 | 1145 | /* Register applicaton to the session daemon */ |
56fff090 | 1146 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1147 | ust_cmd.sock); |
88ff5b7f | 1148 | if (ret == -ENOMEM) { |
5eb91c98 | 1149 | goto error; |
88ff5b7f MD |
1150 | } else if (ret < 0) { |
1151 | break; | |
5eb91c98 DG |
1152 | } |
1153 | ||
acc7b41b | 1154 | /* |
e0c7ec2b | 1155 | * Validate UST version compatibility. |
acc7b41b | 1156 | */ |
e0c7ec2b DG |
1157 | ret = ust_app_validate_version(ust_cmd.sock); |
1158 | if (ret >= 0) { | |
1159 | /* | |
1160 | * Add channel(s) and event(s) to newly registered apps | |
1161 | * from lttng global UST domain. | |
1162 | */ | |
1163 | update_ust_app(ust_cmd.sock); | |
1164 | } | |
acc7b41b | 1165 | |
f2ca2e25 | 1166 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1167 | if (ret < 0) { |
1168 | /* | |
1169 | * If the registration is not possible, we simply | |
1170 | * unregister the apps and continue | |
1171 | */ | |
56fff090 | 1172 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1173 | } else { |
1174 | /* | |
1175 | * We just need here to monitor the close of the UST | |
1176 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1177 | * Listen on POLLIN (even if we never expect any |
1178 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1179 | */ |
a9ade966 | 1180 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1181 | if (ret < 0) { |
1182 | goto error; | |
1183 | } | |
1184 | ||
54d01ffb DG |
1185 | DBG("Apps with sock %d added to poll set", |
1186 | ust_cmd.sock); | |
5eb91c98 | 1187 | } |
487cf67c | 1188 | |
5eb91c98 | 1189 | break; |
0177d773 | 1190 | } |
5eb91c98 DG |
1191 | } else { |
1192 | /* | |
54d01ffb DG |
1193 | * At this point, we know that a registered application made |
1194 | * the event at poll_wait. | |
5eb91c98 DG |
1195 | */ |
1196 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1197 | /* Removing from the poll set */ | |
1198 | ret = lttng_poll_del(&events, pollfd); | |
1199 | if (ret < 0) { | |
1200 | goto error; | |
1201 | } | |
099e26bd | 1202 | |
b9d9b220 | 1203 | /* Socket closed on remote end. */ |
56fff090 | 1204 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1205 | break; |
1206 | } | |
099e26bd DG |
1207 | } |
1208 | } | |
099e26bd DG |
1209 | } |
1210 | ||
1211 | error: | |
1212 | DBG("Application communication apps dying"); | |
1213 | close(apps_cmd_pipe[0]); | |
1214 | close(apps_cmd_pipe[1]); | |
1215 | ||
5eb91c98 | 1216 | lttng_poll_clean(&events); |
099e26bd | 1217 | |
f6a9efaa DG |
1218 | rcu_thread_offline(); |
1219 | rcu_unregister_thread(); | |
099e26bd DG |
1220 | return NULL; |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * Dispatch request from the registration threads to the application | |
1225 | * communication thread. | |
1226 | */ | |
1227 | static void *thread_dispatch_ust_registration(void *data) | |
1228 | { | |
1229 | int ret; | |
1230 | struct cds_wfq_node *node; | |
1231 | struct ust_command *ust_cmd = NULL; | |
1232 | ||
1233 | DBG("[thread] Dispatch UST command started"); | |
1234 | ||
1235 | while (!dispatch_thread_exit) { | |
1236 | /* Atomically prepare the queue futex */ | |
1237 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1238 | ||
1239 | do { | |
1240 | /* Dequeue command for registration */ | |
1241 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1242 | if (node == NULL) { | |
00a17c97 | 1243 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1244 | /* Continue thread execution */ |
1245 | break; | |
1246 | } | |
1247 | ||
1248 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1249 | ||
2f50c8a3 DG |
1250 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1251 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1252 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1253 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1254 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1255 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1256 | /* |
1257 | * Inform apps thread of the new application registration. This | |
1258 | * call is blocking so we can be assured that the data will be read | |
1259 | * at some point in time or wait to the end of the world :) | |
1260 | */ | |
1261 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1262 | sizeof(struct ust_command)); | |
1263 | if (ret < 0) { | |
1264 | perror("write apps cmd pipe"); | |
1265 | if (errno == EBADF) { | |
1266 | /* | |
1267 | * We can't inform the application thread to process | |
1268 | * registration. We will exit or else application | |
1269 | * registration will not occur and tracing will never | |
1270 | * start. | |
1271 | */ | |
1272 | goto error; | |
1273 | } | |
1274 | } | |
1275 | free(ust_cmd); | |
1276 | } while (node != NULL); | |
1277 | ||
1278 | /* Futex wait on queue. Blocking call on futex() */ | |
1279 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1280 | } | |
1281 | ||
1282 | error: | |
1283 | DBG("Dispatch thread dying"); | |
1284 | return NULL; | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * This thread manage application registration. | |
1289 | */ | |
1290 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1291 | { |
5eb91c98 DG |
1292 | int sock = 0, i, ret, pollfd; |
1293 | uint32_t revents, nb_fd; | |
1294 | struct lttng_poll_event events; | |
099e26bd DG |
1295 | /* |
1296 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1297 | * freed in the manage apps thread. | |
1298 | */ | |
1299 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1300 | |
099e26bd | 1301 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1302 | |
1303 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1304 | if (ret < 0) { | |
1305 | goto error; | |
1306 | } | |
1307 | ||
5eb91c98 DG |
1308 | /* |
1309 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1310 | * more will be added to this poll set. | |
1311 | */ | |
1312 | ret = create_thread_poll_set(&events, 2); | |
1313 | if (ret < 0) { | |
1314 | goto error; | |
1315 | } | |
273ea72c | 1316 | |
5eb91c98 DG |
1317 | /* Add the application registration socket */ |
1318 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1319 | if (ret < 0) { | |
1320 | goto error; | |
1321 | } | |
273ea72c | 1322 | |
1d4b027a | 1323 | /* Notify all applications to register */ |
0fdd1e2c DG |
1324 | ret = notify_ust_apps(1); |
1325 | if (ret < 0) { | |
1326 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1327 | "Execution continues but there might be problem for already\n" |
1328 | "running applications that wishes to register."); | |
0fdd1e2c | 1329 | } |
1d4b027a DG |
1330 | |
1331 | while (1) { | |
1332 | DBG("Accepting application registration"); | |
273ea72c | 1333 | |
5eb91c98 DG |
1334 | nb_fd = LTTNG_POLL_GETNB(&events); |
1335 | ||
273ea72c | 1336 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1337 | restart: |
5eb91c98 | 1338 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1339 | if (ret < 0) { |
88f2b785 MD |
1340 | /* |
1341 | * Restart interrupted system call. | |
1342 | */ | |
1343 | if (errno == EINTR) { | |
1344 | goto restart; | |
1345 | } | |
273ea72c DG |
1346 | goto error; |
1347 | } | |
1348 | ||
5eb91c98 DG |
1349 | for (i = 0; i < nb_fd; i++) { |
1350 | /* Fetch once the poll data */ | |
1351 | revents = LTTNG_POLL_GETEV(&events, i); | |
1352 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1353 | |
5eb91c98 DG |
1354 | /* Thread quit pipe has been closed. Killing thread. */ |
1355 | ret = check_thread_quit_pipe(pollfd, revents); | |
1356 | if (ret) { | |
90014c57 DG |
1357 | goto error; |
1358 | } | |
1d4b027a | 1359 | |
5eb91c98 DG |
1360 | /* Event on the registration socket */ |
1361 | if (pollfd == apps_sock) { | |
1362 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1363 | ERR("Register apps socket poll error"); | |
1364 | goto error; | |
1365 | } else if (revents & LPOLLIN) { | |
1366 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1367 | if (sock < 0) { | |
1368 | goto error; | |
1369 | } | |
099e26bd | 1370 | |
5eb91c98 | 1371 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1372 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1373 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1374 | perror("ust command zmalloc"); |
5eb91c98 DG |
1375 | goto error; |
1376 | } | |
1d4b027a | 1377 | |
5eb91c98 DG |
1378 | /* |
1379 | * Using message-based transmissions to ensure we don't | |
1380 | * have to deal with partially received messages. | |
1381 | */ | |
1382 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1383 | sizeof(struct ust_register_msg)); | |
1384 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1385 | if (ret < 0) { | |
1386 | perror("lttcomm_recv_unix_sock register apps"); | |
1387 | } else { | |
1388 | ERR("Wrong size received on apps register"); | |
1389 | } | |
1390 | free(ust_cmd); | |
1391 | close(sock); | |
1392 | continue; | |
1393 | } | |
099e26bd | 1394 | |
5eb91c98 | 1395 | ust_cmd->sock = sock; |
099e26bd | 1396 | |
5eb91c98 DG |
1397 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1398 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1399 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1400 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1401 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1402 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1403 | |
5eb91c98 DG |
1404 | /* |
1405 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1406 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1407 | */ |
1408 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1409 | ||
1410 | /* | |
1411 | * Wake the registration queue futex. Implicit memory | |
1412 | * barrier with the exchange in cds_wfq_enqueue. | |
1413 | */ | |
1414 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1415 | } | |
1416 | } | |
90014c57 | 1417 | } |
1d4b027a DG |
1418 | } |
1419 | ||
1420 | error: | |
0fdd1e2c DG |
1421 | DBG("UST Registration thread dying"); |
1422 | ||
1423 | /* Notify that the registration thread is gone */ | |
1424 | notify_ust_apps(0); | |
1425 | ||
1426 | close(apps_sock); | |
1427 | close(sock); | |
273ea72c | 1428 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1429 | |
5eb91c98 DG |
1430 | lttng_poll_clean(&events); |
1431 | ||
1d4b027a DG |
1432 | return NULL; |
1433 | } | |
1434 | ||
8c0faa1d | 1435 | /* |
3bd1e081 | 1436 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1437 | * exec or it will fails. |
8c0faa1d | 1438 | */ |
3bd1e081 | 1439 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1440 | { |
1441 | int ret; | |
ee0b0061 DG |
1442 | struct timespec timeout; |
1443 | ||
1444 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1445 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1446 | |
1447 | /* Setup semaphore */ | |
3bd1e081 | 1448 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1449 | if (ret < 0) { |
3bd1e081 | 1450 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1451 | goto error; |
1452 | } | |
8c0faa1d | 1453 | |
3bd1e081 MD |
1454 | ret = pthread_create(&consumer_data->thread, NULL, |
1455 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1456 | if (ret != 0) { |
3bd1e081 | 1457 | PERROR("pthread_create consumer"); |
ee0b0061 | 1458 | ret = -1; |
8c0faa1d DG |
1459 | goto error; |
1460 | } | |
1461 | ||
ee0b0061 DG |
1462 | /* Get time for sem_timedwait absolute timeout */ |
1463 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1464 | if (ret < 0) { | |
3bd1e081 | 1465 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1466 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1467 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1468 | } else { |
1469 | /* Normal timeout if the gettime was successful */ | |
1470 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1471 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1472 | } |
8c0faa1d | 1473 | |
ee0b0061 DG |
1474 | if (ret < 0) { |
1475 | if (errno == ETIMEDOUT) { | |
1476 | /* | |
1477 | * Call has timed out so we kill the kconsumerd_thread and return | |
1478 | * an error. | |
1479 | */ | |
3bd1e081 MD |
1480 | ERR("The consumer thread was never ready. Killing it"); |
1481 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1482 | if (ret < 0) { |
3bd1e081 | 1483 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1484 | } |
1485 | } else { | |
3bd1e081 | 1486 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1487 | } |
1488 | goto error; | |
1489 | } | |
1490 | ||
3bd1e081 MD |
1491 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1492 | if (consumer_data->pid == 0) { | |
712ea556 | 1493 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1494 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1495 | goto error; |
1496 | } | |
3bd1e081 | 1497 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1498 | |
8c0faa1d DG |
1499 | return 0; |
1500 | ||
1501 | error: | |
1502 | return ret; | |
1503 | } | |
1504 | ||
d9800920 | 1505 | /* |
3bd1e081 | 1506 | * Join consumer thread |
d9800920 | 1507 | */ |
3bd1e081 | 1508 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1509 | { |
1510 | void *status; | |
1511 | int ret; | |
1512 | ||
3bd1e081 MD |
1513 | if (consumer_data->pid != 0) { |
1514 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1515 | if (ret) { |
3bd1e081 | 1516 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1517 | return ret; |
1518 | } | |
3bd1e081 | 1519 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1520 | } else { |
1521 | return 0; | |
1522 | } | |
1523 | } | |
1524 | ||
8c0faa1d | 1525 | /* |
3bd1e081 | 1526 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1527 | * |
d063d709 | 1528 | * Return pid if successful else -1. |
8c0faa1d | 1529 | */ |
3bd1e081 | 1530 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1531 | { |
1532 | int ret; | |
1533 | pid_t pid; | |
94c55f17 | 1534 | const char *consumer_to_use; |
53086306 | 1535 | const char *verbosity; |
94c55f17 | 1536 | struct stat st; |
8c0faa1d | 1537 | |
3bd1e081 | 1538 | DBG("Spawning consumerd"); |
c49dc785 | 1539 | |
8c0faa1d DG |
1540 | pid = fork(); |
1541 | if (pid == 0) { | |
1542 | /* | |
3bd1e081 | 1543 | * Exec consumerd. |
8c0faa1d | 1544 | */ |
daee5345 | 1545 | if (opt_verbose_consumer) { |
53086306 DG |
1546 | verbosity = "--verbose"; |
1547 | } else { | |
1548 | verbosity = "--quiet"; | |
1549 | } | |
3bd1e081 MD |
1550 | switch (consumer_data->type) { |
1551 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1552 | /* |
c7704d57 DG |
1553 | * Find out which consumerd to execute. We will first try the |
1554 | * 64-bit path, then the sessiond's installation directory, and | |
1555 | * fallback on the 32-bit one, | |
94c55f17 | 1556 | */ |
63a799e8 AM |
1557 | DBG3("Looking for a kernel consumer at these locations:"); |
1558 | DBG3(" 1) %s", consumerd64_bin); | |
1559 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1560 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1561 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1562 | DBG3("Found location #1"); |
94c55f17 | 1563 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1564 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1565 | DBG3("Found location #2"); |
94c55f17 | 1566 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1567 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1568 | DBG3("Found location #3"); |
eb1e0bd4 | 1569 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1570 | } else { |
63a799e8 | 1571 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1572 | break; |
1573 | } | |
1574 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1575 | execl(consumer_to_use, | |
1576 | "lttng-consumerd", verbosity, "-k", | |
1577 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1578 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1579 | NULL); | |
3bd1e081 | 1580 | break; |
7753dea8 MD |
1581 | case LTTNG_CONSUMER64_UST: |
1582 | { | |
b1e0b6b6 | 1583 | char *tmpnew = NULL; |
8f4905da MD |
1584 | |
1585 | if (consumerd64_libdir[0] != '\0') { | |
1586 | char *tmp; | |
1587 | size_t tmplen; | |
1588 | ||
1589 | tmp = getenv("LD_LIBRARY_PATH"); | |
1590 | if (!tmp) { | |
1591 | tmp = ""; | |
1592 | } | |
1593 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1594 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1595 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1596 | if (!tmpnew) { | |
1597 | ret = -ENOMEM; | |
1598 | goto error; | |
1599 | } | |
1600 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1601 | strcat(tmpnew, consumerd64_libdir); | |
1602 | if (tmp[0] != '\0') { | |
1603 | strcat(tmpnew, ":"); | |
1604 | strcat(tmpnew, tmp); | |
1605 | } | |
1606 | ret = putenv(tmpnew); | |
1607 | if (ret) { | |
1608 | ret = -errno; | |
1609 | goto error; | |
1610 | } | |
1611 | } | |
94c55f17 | 1612 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1613 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1614 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1615 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1616 | NULL); | |
8f4905da MD |
1617 | if (consumerd64_libdir[0] != '\0') { |
1618 | free(tmpnew); | |
1619 | } | |
1620 | if (ret) { | |
1621 | goto error; | |
1622 | } | |
3bd1e081 | 1623 | break; |
7753dea8 MD |
1624 | } |
1625 | case LTTNG_CONSUMER32_UST: | |
1626 | { | |
937dde8e | 1627 | char *tmpnew = NULL; |
8f4905da MD |
1628 | |
1629 | if (consumerd32_libdir[0] != '\0') { | |
1630 | char *tmp; | |
1631 | size_t tmplen; | |
1632 | ||
1633 | tmp = getenv("LD_LIBRARY_PATH"); | |
1634 | if (!tmp) { | |
1635 | tmp = ""; | |
1636 | } | |
1637 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1638 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1639 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1640 | if (!tmpnew) { | |
1641 | ret = -ENOMEM; | |
1642 | goto error; | |
1643 | } | |
1644 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1645 | strcat(tmpnew, consumerd32_libdir); | |
1646 | if (tmp[0] != '\0') { | |
1647 | strcat(tmpnew, ":"); | |
1648 | strcat(tmpnew, tmp); | |
1649 | } | |
1650 | ret = putenv(tmpnew); | |
1651 | if (ret) { | |
1652 | ret = -errno; | |
1653 | goto error; | |
1654 | } | |
1655 | } | |
94c55f17 | 1656 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1657 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1658 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1659 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1660 | NULL); | |
8f4905da MD |
1661 | if (consumerd32_libdir[0] != '\0') { |
1662 | free(tmpnew); | |
1663 | } | |
1664 | if (ret) { | |
1665 | goto error; | |
1666 | } | |
7753dea8 MD |
1667 | break; |
1668 | } | |
3bd1e081 MD |
1669 | default: |
1670 | perror("unknown consumer type"); | |
1671 | exit(EXIT_FAILURE); | |
1672 | } | |
8c0faa1d DG |
1673 | if (errno != 0) { |
1674 | perror("kernel start consumer exec"); | |
1675 | } | |
1676 | exit(EXIT_FAILURE); | |
1677 | } else if (pid > 0) { | |
1678 | ret = pid; | |
8c0faa1d | 1679 | } else { |
3bd1e081 | 1680 | perror("start consumer fork"); |
8c0faa1d | 1681 | ret = -errno; |
8c0faa1d | 1682 | } |
8f4905da | 1683 | error: |
8c0faa1d DG |
1684 | return ret; |
1685 | } | |
1686 | ||
693bd40b | 1687 | /* |
3bd1e081 | 1688 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1689 | */ |
3bd1e081 | 1690 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1691 | { |
1692 | int ret; | |
1693 | ||
3bd1e081 MD |
1694 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1695 | if (consumer_data->pid != 0) { | |
1696 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1697 | goto end; |
1698 | } | |
693bd40b | 1699 | |
3bd1e081 | 1700 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1701 | if (ret < 0) { |
3bd1e081 MD |
1702 | ERR("Spawning consumerd failed"); |
1703 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1704 | goto error; |
693bd40b | 1705 | } |
c49dc785 | 1706 | |
3bd1e081 MD |
1707 | /* Setting up the consumer_data pid */ |
1708 | consumer_data->pid = ret; | |
48842b30 | 1709 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1710 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1711 | |
3bd1e081 MD |
1712 | DBG2("Spawning consumer control thread"); |
1713 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1714 | if (ret < 0) { |
3bd1e081 | 1715 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1716 | goto error; |
1717 | } | |
1718 | ||
c49dc785 | 1719 | end: |
693bd40b DG |
1720 | return 0; |
1721 | ||
1722 | error: | |
1723 | return ret; | |
1724 | } | |
1725 | ||
b73401da | 1726 | /* |
096102bd | 1727 | * Check version of the lttng-modules. |
b73401da | 1728 | */ |
096102bd | 1729 | static int validate_lttng_modules_version(void) |
b73401da | 1730 | { |
096102bd | 1731 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1732 | } |
1733 | ||
b73401da | 1734 | /* |
096102bd | 1735 | * Setup necessary data for kernel tracer action. |
b73401da | 1736 | */ |
096102bd | 1737 | static int init_kernel_tracer(void) |
b73401da DG |
1738 | { |
1739 | int ret; | |
b73401da | 1740 | |
096102bd DG |
1741 | /* Modprobe lttng kernel modules */ |
1742 | ret = modprobe_lttng_control(); | |
b73401da | 1743 | if (ret < 0) { |
b73401da DG |
1744 | goto error; |
1745 | } | |
1746 | ||
096102bd DG |
1747 | /* Open debugfs lttng */ |
1748 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1749 | if (kernel_tracer_fd < 0) { | |
1750 | DBG("Failed to open %s", module_proc_lttng); | |
1751 | ret = -1; | |
1752 | goto error_open; | |
b73401da DG |
1753 | } |
1754 | ||
096102bd DG |
1755 | /* Validate kernel version */ |
1756 | ret = validate_lttng_modules_version(); | |
b73401da | 1757 | if (ret < 0) { |
096102bd | 1758 | goto error_version; |
b73401da DG |
1759 | } |
1760 | ||
096102bd | 1761 | ret = modprobe_lttng_data(); |
b73401da | 1762 | if (ret < 0) { |
096102bd | 1763 | goto error_modules; |
8c0faa1d DG |
1764 | } |
1765 | ||
f3ed775e | 1766 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1767 | return 0; |
1768 | ||
1769 | error_version: | |
1770 | modprobe_remove_lttng_control(); | |
1771 | close(kernel_tracer_fd); | |
1772 | kernel_tracer_fd = 0; | |
1773 | return LTTCOMM_KERN_VERSION; | |
1774 | ||
1775 | error_modules: | |
1776 | close(kernel_tracer_fd); | |
1777 | ||
1778 | error_open: | |
1779 | modprobe_remove_lttng_control(); | |
b73401da DG |
1780 | |
1781 | error: | |
b73401da DG |
1782 | WARN("No kernel tracer available"); |
1783 | kernel_tracer_fd = 0; | |
096102bd | 1784 | return LTTCOMM_KERN_NA; |
f3ed775e | 1785 | } |
33a2b854 | 1786 | |
f3ed775e | 1787 | /* |
54d01ffb | 1788 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1789 | */ |
54d01ffb | 1790 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1791 | { |
f40799e8 | 1792 | int ret = 0; |
8c0faa1d | 1793 | |
3bd1e081 | 1794 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1795 | /* |
54d01ffb DG |
1796 | * Assign default kernel consumer socket if no consumer assigned to the |
1797 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1798 | * an extra security check. | |
d9800920 DG |
1799 | */ |
1800 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1801 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1802 | } |
1803 | ||
2bdd86d4 | 1804 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1805 | if (ret < 0) { |
f3ed775e DG |
1806 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1807 | goto error; | |
1808 | } | |
1d4b027a | 1809 | |
3bd1e081 | 1810 | session->consumer_fds_sent = 1; |
f3ed775e | 1811 | } |
1d4b027a DG |
1812 | |
1813 | error: | |
1814 | return ret; | |
8c0faa1d DG |
1815 | } |
1816 | ||
0177d773 DG |
1817 | /* |
1818 | * Create an UST session and add it to the session ust list. | |
1819 | */ | |
44d3bd01 | 1820 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1821 | struct lttng_domain *domain) |
0177d773 | 1822 | { |
13384287 | 1823 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1824 | int ret; |
44d3bd01 DG |
1825 | |
1826 | switch (domain->type) { | |
48842b30 | 1827 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1828 | break; |
1829 | default: | |
13384287 | 1830 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1831 | goto error; |
1832 | } | |
0177d773 DG |
1833 | |
1834 | DBG("Creating UST session"); | |
1835 | ||
a991f516 | 1836 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1837 | if (lus == NULL) { |
44d3bd01 | 1838 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1839 | goto error; |
1840 | } | |
1841 | ||
e11d277b | 1842 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1843 | session->uid, session->gid); |
0177d773 DG |
1844 | if (ret < 0) { |
1845 | if (ret != -EEXIST) { | |
1846 | ERR("Trace directory creation error"); | |
44d3bd01 | 1847 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1848 | goto error; |
1849 | } | |
1850 | } | |
1851 | ||
f6a9efaa DG |
1852 | /* The domain type dictate different actions on session creation */ |
1853 | switch (domain->type) { | |
48842b30 DG |
1854 | case LTTNG_DOMAIN_UST: |
1855 | /* No ustctl for the global UST domain */ | |
1856 | break; | |
1857 | default: | |
36dc12cc | 1858 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1859 | goto error; |
0177d773 | 1860 | } |
6df2e2c9 MD |
1861 | lus->uid = session->uid; |
1862 | lus->gid = session->gid; | |
f6a9efaa | 1863 | session->ust_session = lus; |
44d3bd01 DG |
1864 | |
1865 | return LTTCOMM_OK; | |
0177d773 DG |
1866 | |
1867 | error: | |
1868 | free(lus); | |
1869 | return ret; | |
1870 | } | |
1871 | ||
333f285e | 1872 | /* |
d063d709 | 1873 | * Create a kernel tracer session then create the default channel. |
333f285e | 1874 | */ |
6df2e2c9 | 1875 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1876 | { |
f3ed775e | 1877 | int ret; |
f3ed775e DG |
1878 | |
1879 | DBG("Creating kernel session"); | |
1880 | ||
1881 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1882 | if (ret < 0) { | |
1883 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1884 | goto error; | |
333f285e DG |
1885 | } |
1886 | ||
d9800920 | 1887 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1888 | if (kconsumer_data.cmd_sock) { |
1889 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1890 | } |
1891 | ||
e11d277b | 1892 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1893 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1894 | if (ret < 0) { |
996b65c8 | 1895 | if (ret != -EEXIST) { |
7a485870 DG |
1896 | ERR("Trace directory creation error"); |
1897 | goto error; | |
1898 | } | |
1899 | } | |
6df2e2c9 MD |
1900 | session->kernel_session->uid = session->uid; |
1901 | session->kernel_session->gid = session->gid; | |
7a485870 | 1902 | |
f3ed775e DG |
1903 | error: |
1904 | return ret; | |
333f285e DG |
1905 | } |
1906 | ||
8e0af1b4 | 1907 | /* |
c7704d57 DG |
1908 | * Check if the UID or GID match the session. Root user has access to all |
1909 | * sessions. | |
8e0af1b4 | 1910 | */ |
c7704d57 | 1911 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1912 | { |
c7704d57 | 1913 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
1914 | return 0; |
1915 | } else { | |
1916 | return 1; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1921 | { | |
1922 | unsigned int i = 0; | |
1923 | struct ltt_session *session; | |
1924 | ||
1925 | DBG("Counting number of available session for UID %d GID %d", | |
1926 | uid, gid); | |
1927 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1928 | /* | |
1929 | * Only list the sessions the user can control. | |
1930 | */ | |
1931 | if (!session_access_ok(session, uid, gid)) { | |
1932 | continue; | |
1933 | } | |
1934 | i++; | |
1935 | } | |
1936 | return i; | |
1937 | } | |
1938 | ||
6c9cc2ab DG |
1939 | /* |
1940 | * Using the session list, filled a lttng_session array to send back to the | |
1941 | * client for session listing. | |
1942 | * | |
1943 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1944 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 1945 | */ |
c7704d57 DG |
1946 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
1947 | gid_t gid) | |
6c9cc2ab | 1948 | { |
8e0af1b4 | 1949 | unsigned int i = 0; |
6c9cc2ab DG |
1950 | struct ltt_session *session; |
1951 | ||
8e0af1b4 MD |
1952 | DBG("Getting all available session for UID %d GID %d", |
1953 | uid, gid); | |
6c9cc2ab DG |
1954 | /* |
1955 | * Iterate over session list and append data after the control struct in | |
1956 | * the buffer. | |
1957 | */ | |
1958 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
1959 | /* |
1960 | * Only list the sessions the user can control. | |
1961 | */ | |
1962 | if (!session_access_ok(session, uid, gid)) { | |
1963 | continue; | |
1964 | } | |
6c9cc2ab | 1965 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 1966 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1967 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1968 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1969 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1970 | i++; |
1971 | } | |
1972 | } | |
1973 | ||
9f19cc17 DG |
1974 | /* |
1975 | * Fill lttng_channel array of all channels. | |
1976 | */ | |
b551a063 | 1977 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1978 | struct lttng_channel *channels) |
1979 | { | |
1980 | int i = 0; | |
1981 | struct ltt_kernel_channel *kchan; | |
1982 | ||
1983 | DBG("Listing channels for session %s", session->name); | |
1984 | ||
b551a063 DG |
1985 | switch (domain) { |
1986 | case LTTNG_DOMAIN_KERNEL: | |
1987 | /* Kernel channels */ | |
1988 | if (session->kernel_session != NULL) { | |
1989 | cds_list_for_each_entry(kchan, | |
1990 | &session->kernel_session->channel_list.head, list) { | |
1991 | /* Copy lttng_channel struct to array */ | |
1992 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1993 | channels[i].enabled = kchan->enabled; | |
1994 | i++; | |
1995 | } | |
1996 | } | |
1997 | break; | |
1998 | case LTTNG_DOMAIN_UST: | |
1999 | { | |
bec39940 | 2000 | struct lttng_ht_iter iter; |
b551a063 DG |
2001 | struct ltt_ust_channel *uchan; |
2002 | ||
bec39940 DG |
2003 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2004 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2005 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2006 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2007 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2008 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2009 | channels[i].attr.switch_timer_interval = | |
2010 | uchan->attr.switch_timer_interval; | |
2011 | channels[i].attr.read_timer_interval = | |
2012 | uchan->attr.read_timer_interval; | |
aea829b3 | 2013 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2014 | switch (uchan->attr.output) { |
2015 | case LTTNG_UST_MMAP: | |
2016 | default: | |
2017 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2018 | break; | |
2019 | } | |
befe0905 | 2020 | i++; |
b551a063 DG |
2021 | } |
2022 | break; | |
2023 | } | |
2024 | default: | |
2025 | break; | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | /* | |
2030 | * Create a list of ust global domain events. | |
2031 | */ | |
2032 | static int list_lttng_ust_global_events(char *channel_name, | |
2033 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2034 | { | |
2035 | int i = 0, ret = 0; | |
2036 | unsigned int nb_event = 0; | |
bec39940 DG |
2037 | struct lttng_ht_iter iter; |
2038 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2039 | struct ltt_ust_channel *uchan; |
2040 | struct ltt_ust_event *uevent; | |
2041 | struct lttng_event *tmp; | |
2042 | ||
2043 | DBG("Listing UST global events for channel %s", channel_name); | |
2044 | ||
2045 | rcu_read_lock(); | |
2046 | ||
bec39940 DG |
2047 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2048 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2049 | if (node == NULL) { |
2050 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2051 | goto error; | |
b551a063 DG |
2052 | } |
2053 | ||
bec39940 | 2054 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2055 | |
bec39940 | 2056 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2057 | |
b551a063 DG |
2058 | if (nb_event == 0) { |
2059 | ret = nb_event; | |
2060 | goto error; | |
2061 | } | |
2062 | ||
2063 | DBG3("Listing UST global %d events", nb_event); | |
2064 | ||
2065 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2066 | if (tmp == NULL) { | |
2067 | ret = -LTTCOMM_FATAL; | |
2068 | goto error; | |
2069 | } | |
2070 | ||
bec39940 | 2071 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2072 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2073 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2074 | tmp[i].enabled = uevent->enabled; | |
2075 | switch (uevent->attr.instrumentation) { | |
2076 | case LTTNG_UST_TRACEPOINT: | |
2077 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2078 | break; | |
2079 | case LTTNG_UST_PROBE: | |
2080 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2081 | break; | |
2082 | case LTTNG_UST_FUNCTION: | |
2083 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2084 | break; | |
0cda4f28 | 2085 | } |
8005f29a | 2086 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2087 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2088 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2089 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2090 | break; |
8005f29a | 2091 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2092 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2093 | break; |
2094 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2095 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2096 | break; |
9f19cc17 | 2097 | } |
d7b75b30 | 2098 | i++; |
9f19cc17 DG |
2099 | } |
2100 | ||
b551a063 DG |
2101 | ret = nb_event; |
2102 | *events = tmp; | |
2103 | ||
2104 | error: | |
2105 | rcu_read_unlock(); | |
2106 | return ret; | |
9f19cc17 DG |
2107 | } |
2108 | ||
2109 | /* | |
b551a063 | 2110 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2111 | */ |
b551a063 DG |
2112 | static int list_lttng_kernel_events(char *channel_name, |
2113 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2114 | { |
b551a063 DG |
2115 | int i = 0, ret; |
2116 | unsigned int nb_event; | |
9f19cc17 | 2117 | struct ltt_kernel_event *event; |
b551a063 DG |
2118 | struct ltt_kernel_channel *kchan; |
2119 | ||
2120 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2121 | if (kchan == NULL) { | |
2122 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2123 | goto error; | |
2124 | } | |
2125 | ||
2126 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2127 | |
2128 | DBG("Listing events for channel %s", kchan->channel->name); | |
2129 | ||
b551a063 DG |
2130 | if (nb_event == 0) { |
2131 | ret = nb_event; | |
2132 | goto error; | |
2133 | } | |
2134 | ||
2135 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2136 | if (*events == NULL) { | |
2137 | ret = LTTCOMM_FATAL; | |
2138 | goto error; | |
2139 | } | |
2140 | ||
9f19cc17 DG |
2141 | /* Kernel channels */ |
2142 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2143 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2144 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2145 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2146 | switch (event->event->instrumentation) { |
2147 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2148 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2149 | break; |
2150 | case LTTNG_KERNEL_KPROBE: | |
2151 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2152 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2153 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2154 | sizeof(struct lttng_kernel_kprobe)); |
2155 | break; | |
2156 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2157 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2158 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2159 | sizeof(struct lttng_kernel_function)); |
2160 | break; | |
0133c199 | 2161 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2162 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2163 | break; |
a54bd42d | 2164 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2165 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2166 | break; |
7a3d1328 MD |
2167 | case LTTNG_KERNEL_ALL: |
2168 | assert(0); | |
2169 | break; | |
9f19cc17 DG |
2170 | } |
2171 | i++; | |
2172 | } | |
b551a063 DG |
2173 | |
2174 | return nb_event; | |
2175 | ||
2176 | error: | |
2177 | return ret; | |
9f19cc17 DG |
2178 | } |
2179 | ||
fac6795d | 2180 | /* |
54d01ffb | 2181 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2182 | */ |
54d01ffb DG |
2183 | static int cmd_disable_channel(struct ltt_session *session, |
2184 | int domain, char *channel_name) | |
fac6795d | 2185 | { |
54d01ffb | 2186 | int ret; |
78f0bacd DG |
2187 | struct ltt_ust_session *usess; |
2188 | ||
2189 | usess = session->ust_session; | |
379473d2 | 2190 | |
54d01ffb | 2191 | switch (domain) { |
78f0bacd DG |
2192 | case LTTNG_DOMAIN_KERNEL: |
2193 | { | |
2194 | ret = channel_kernel_disable(session->kernel_session, | |
2195 | channel_name); | |
2196 | if (ret != LTTCOMM_OK) { | |
2197 | goto error; | |
2198 | } | |
54d01ffb | 2199 | |
78f0bacd DG |
2200 | kernel_wait_quiescent(kernel_tracer_fd); |
2201 | break; | |
2202 | } | |
2203 | case LTTNG_DOMAIN_UST: | |
2204 | { | |
2205 | struct ltt_ust_channel *uchan; | |
bec39940 | 2206 | struct lttng_ht *chan_ht; |
78f0bacd | 2207 | |
7885e399 DG |
2208 | chan_ht = usess->domain_global.channels; |
2209 | ||
2210 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2211 | if (uchan == NULL) { |
2212 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2213 | goto error; |
78f0bacd DG |
2214 | } |
2215 | ||
7885e399 DG |
2216 | ret = channel_ust_disable(usess, domain, uchan); |
2217 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2218 | goto error; |
2219 | } | |
78f0bacd DG |
2220 | break; |
2221 | } | |
d78d6610 | 2222 | #if 0 |
78f0bacd DG |
2223 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2224 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2225 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2226 | #endif |
78f0bacd DG |
2227 | default: |
2228 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2229 | goto error; | |
20fe2104 DG |
2230 | } |
2231 | ||
54d01ffb | 2232 | ret = LTTCOMM_OK; |
d65106b1 | 2233 | |
54d01ffb DG |
2234 | error: |
2235 | return ret; | |
2236 | } | |
2237 | ||
2238 | /* | |
2239 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2240 | */ | |
44d3bd01 | 2241 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2242 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2243 | { |
2244 | int ret; | |
f6a9efaa | 2245 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2246 | struct lttng_ht *chan_ht; |
f6a9efaa | 2247 | |
5d56b5aa | 2248 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2249 | |
aea829b3 | 2250 | switch (domain) { |
44d3bd01 DG |
2251 | case LTTNG_DOMAIN_KERNEL: |
2252 | { | |
2253 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2254 | |
44d3bd01 DG |
2255 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2256 | session->kernel_session); | |
2257 | if (kchan == NULL) { | |
2258 | ret = channel_kernel_create(session->kernel_session, | |
2259 | attr, kernel_poll_pipe[1]); | |
2260 | } else { | |
2261 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2262 | } | |
2263 | ||
2264 | if (ret != LTTCOMM_OK) { | |
2265 | goto error; | |
2266 | } | |
2267 | ||
2268 | kernel_wait_quiescent(kernel_tracer_fd); | |
2269 | break; | |
2270 | } | |
f6a9efaa DG |
2271 | case LTTNG_DOMAIN_UST: |
2272 | { | |
2273 | struct ltt_ust_channel *uchan; | |
2274 | ||
7885e399 | 2275 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2276 | |
7885e399 | 2277 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2278 | if (uchan == NULL) { |
7885e399 | 2279 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2280 | } else { |
7885e399 | 2281 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2282 | } |
f6a9efaa DG |
2283 | break; |
2284 | } | |
d78d6610 | 2285 | #if 0 |
78f0bacd DG |
2286 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2287 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2288 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2289 | #endif |
44d3bd01 DG |
2290 | default: |
2291 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2292 | goto error; | |
54d01ffb DG |
2293 | } |
2294 | ||
54d01ffb DG |
2295 | error: |
2296 | return ret; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2301 | */ | |
2302 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2303 | char *channel_name, char *event_name) | |
2304 | { | |
2305 | int ret; | |
54d01ffb DG |
2306 | |
2307 | switch (domain) { | |
2308 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2309 | { |
2310 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2311 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2312 | |
b0a40d28 DG |
2313 | ksess = session->kernel_session; |
2314 | ||
2315 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2316 | if (kchan == NULL) { |
2317 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2318 | goto error; | |
d65106b1 DG |
2319 | } |
2320 | ||
b0a40d28 | 2321 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2322 | if (ret != LTTCOMM_OK) { |
2323 | goto error; | |
2324 | } | |
2325 | ||
2326 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2327 | break; |
2bdd86d4 MD |
2328 | } |
2329 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2330 | { |
b0a40d28 | 2331 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2332 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2333 | |
2334 | usess = session->ust_session; | |
2335 | ||
2336 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2337 | channel_name); | |
2338 | if (uchan == NULL) { | |
2339 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2340 | goto error; | |
2341 | } | |
2342 | ||
7f79d3a1 DG |
2343 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2344 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2345 | goto error; |
2346 | } | |
2347 | ||
7f79d3a1 | 2348 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2349 | channel_name); |
b0a40d28 DG |
2350 | break; |
2351 | } | |
d78d6610 | 2352 | #if 0 |
2bdd86d4 MD |
2353 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2354 | case LTTNG_DOMAIN_UST_PID: | |
2355 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2356 | #endif |
54d01ffb | 2357 | default: |
1ab1ea0b | 2358 | ret = LTTCOMM_UND; |
54d01ffb | 2359 | goto error; |
d65106b1 | 2360 | } |
26cc6b4e | 2361 | |
54d01ffb DG |
2362 | ret = LTTCOMM_OK; |
2363 | ||
2364 | error: | |
2365 | return ret; | |
2366 | } | |
2367 | ||
2368 | /* | |
2369 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2370 | */ | |
2371 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2372 | char *channel_name) | |
2373 | { | |
2374 | int ret; | |
54d01ffb DG |
2375 | |
2376 | switch (domain) { | |
2377 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2378 | { |
2379 | struct ltt_kernel_session *ksess; | |
2380 | struct ltt_kernel_channel *kchan; | |
2381 | ||
2382 | ksess = session->kernel_session; | |
2383 | ||
2384 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2385 | if (kchan == NULL) { |
2386 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2387 | goto error; | |
26cc6b4e DG |
2388 | } |
2389 | ||
9730260e | 2390 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2391 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2392 | goto error; |
26cc6b4e DG |
2393 | } |
2394 | ||
54d01ffb | 2395 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2396 | break; |
9730260e DG |
2397 | } |
2398 | case LTTNG_DOMAIN_UST: | |
2399 | { | |
2400 | struct ltt_ust_session *usess; | |
2401 | struct ltt_ust_channel *uchan; | |
2402 | ||
2403 | usess = session->ust_session; | |
2404 | ||
2405 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2406 | channel_name); | |
2407 | if (uchan == NULL) { | |
2408 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2409 | goto error; | |
2410 | } | |
2411 | ||
7f79d3a1 DG |
2412 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2413 | if (ret != 0) { | |
9730260e DG |
2414 | goto error; |
2415 | } | |
2416 | ||
7f79d3a1 | 2417 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2418 | |
2419 | break; | |
2420 | } | |
d78d6610 | 2421 | #if 0 |
9730260e DG |
2422 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2423 | case LTTNG_DOMAIN_UST_PID: | |
2424 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2425 | #endif |
54d01ffb | 2426 | default: |
1ab1ea0b | 2427 | ret = LTTCOMM_UND; |
54d01ffb | 2428 | goto error; |
26cc6b4e | 2429 | } |
e953ef25 | 2430 | |
54d01ffb | 2431 | ret = LTTCOMM_OK; |
e953ef25 | 2432 | |
54d01ffb DG |
2433 | error: |
2434 | return ret; | |
2435 | } | |
f5177a38 | 2436 | |
54d01ffb DG |
2437 | /* |
2438 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2439 | */ | |
2440 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2441 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2442 | { | |
2443 | int ret; | |
f5177a38 | 2444 | |
54d01ffb DG |
2445 | switch (domain) { |
2446 | case LTTNG_DOMAIN_KERNEL: | |
2447 | /* Add kernel context to kernel tracer */ | |
2448 | ret = context_kernel_add(session->kernel_session, ctx, | |
2449 | event_name, channel_name); | |
2450 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2451 | goto error; |
e953ef25 | 2452 | } |
2bdd86d4 MD |
2453 | break; |
2454 | case LTTNG_DOMAIN_UST: | |
2455 | { | |
55cc08a6 | 2456 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2457 | |
55cc08a6 DG |
2458 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2459 | if (ret != LTTCOMM_OK) { | |
2460 | goto error; | |
2bdd86d4 | 2461 | } |
e953ef25 | 2462 | break; |
2bdd86d4 | 2463 | } |
d78d6610 | 2464 | #if 0 |
55cc08a6 DG |
2465 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2466 | case LTTNG_DOMAIN_UST_PID: | |
2467 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2468 | #endif |
54d01ffb | 2469 | default: |
1ab1ea0b | 2470 | ret = LTTCOMM_UND; |
54d01ffb | 2471 | goto error; |
e953ef25 | 2472 | } |
950131af | 2473 | |
54d01ffb | 2474 | ret = LTTCOMM_OK; |
950131af | 2475 | |
54d01ffb DG |
2476 | error: |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | /* | |
2481 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2482 | */ | |
2483 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2484 | char *channel_name, struct lttng_event *event) | |
2485 | { | |
2486 | int ret; | |
f6cd6b0f | 2487 | struct lttng_channel *attr; |
48842b30 | 2488 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2489 | |
2490 | switch (domain) { | |
2491 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2492 | { |
2493 | struct ltt_kernel_channel *kchan; | |
2494 | ||
54d01ffb DG |
2495 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2496 | session->kernel_session); | |
2497 | if (kchan == NULL) { | |
f6cd6b0f DG |
2498 | attr = channel_new_default_attr(domain); |
2499 | if (attr == NULL) { | |
2500 | ret = LTTCOMM_FATAL; | |
2501 | goto error; | |
2502 | } | |
2503 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2504 | ||
54d01ffb | 2505 | /* This call will notify the kernel thread */ |
44d3bd01 | 2506 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2507 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2508 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2509 | free(attr); |
f5177a38 DG |
2510 | goto error; |
2511 | } | |
ff4d74e6 | 2512 | free(attr); |
54d01ffb | 2513 | } |
950131af | 2514 | |
54d01ffb DG |
2515 | /* Get the newly created kernel channel pointer */ |
2516 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2517 | session->kernel_session); | |
2518 | if (kchan == NULL) { | |
2519 | /* This sould not happen... */ | |
2520 | ret = LTTCOMM_FATAL; | |
2521 | goto error; | |
2522 | } | |
f5177a38 | 2523 | |
48842b30 DG |
2524 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2525 | event); | |
54d01ffb | 2526 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2527 | goto error; |
950131af DG |
2528 | } |
2529 | ||
54d01ffb | 2530 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2531 | break; |
2bdd86d4 MD |
2532 | } |
2533 | case LTTNG_DOMAIN_UST: | |
2534 | { | |
aea829b3 | 2535 | struct lttng_channel *attr; |
edb67388 | 2536 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2537 | |
edb67388 | 2538 | /* Get channel from global UST domain */ |
48842b30 DG |
2539 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2540 | channel_name); | |
2541 | if (uchan == NULL) { | |
aea829b3 DG |
2542 | /* Create default channel */ |
2543 | attr = channel_new_default_attr(domain); | |
2544 | if (attr == NULL) { | |
2545 | ret = LTTCOMM_FATAL; | |
2546 | goto error; | |
2547 | } | |
596219f7 | 2548 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2549 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2550 | |
7885e399 | 2551 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2552 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2553 | free(attr); |
aea829b3 DG |
2554 | goto error; |
2555 | } | |
aea829b3 DG |
2556 | free(attr); |
2557 | ||
2558 | /* Get the newly created channel reference back */ | |
2559 | uchan = trace_ust_find_channel_by_name( | |
2560 | usess->domain_global.channels, channel_name); | |
2561 | if (uchan == NULL) { | |
2562 | /* Something is really wrong */ | |
2563 | ret = LTTCOMM_FATAL; | |
2564 | goto error; | |
2565 | } | |
48842b30 | 2566 | } |
2bdd86d4 | 2567 | |
edb67388 | 2568 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2569 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2570 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2571 | goto error; |
2bdd86d4 MD |
2572 | } |
2573 | break; | |
2574 | } | |
d78d6610 | 2575 | #if 0 |
2bdd86d4 MD |
2576 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2577 | case LTTNG_DOMAIN_UST_PID: | |
2578 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2579 | #endif |
54d01ffb | 2580 | default: |
1ab1ea0b | 2581 | ret = LTTCOMM_UND; |
54d01ffb | 2582 | goto error; |
950131af | 2583 | } |
d36b8583 | 2584 | |
54d01ffb | 2585 | ret = LTTCOMM_OK; |
d36b8583 | 2586 | |
54d01ffb DG |
2587 | error: |
2588 | return ret; | |
2589 | } | |
7d29a247 | 2590 | |
54d01ffb DG |
2591 | /* |
2592 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2593 | */ | |
2594 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2595 | char *channel_name, int event_type) |
54d01ffb DG |
2596 | { |
2597 | int ret; | |
2598 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2599 | |
54d01ffb DG |
2600 | switch (domain) { |
2601 | case LTTNG_DOMAIN_KERNEL: | |
2602 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2603 | session->kernel_session); | |
2604 | if (kchan == NULL) { | |
2605 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2606 | ret = channel_kernel_create(session->kernel_session, NULL, |
2607 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2608 | if (ret != LTTCOMM_OK) { |
2609 | goto error; | |
d36b8583 | 2610 | } |
0d0c377a | 2611 | |
8f69e5eb DG |
2612 | /* Get the newly created kernel channel pointer */ |
2613 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2614 | session->kernel_session); | |
2615 | if (kchan == NULL) { | |
2616 | /* This sould not happen... */ | |
2617 | ret = LTTCOMM_FATAL; | |
2618 | goto error; | |
2619 | } | |
2620 | ||
54d01ffb | 2621 | } |
0fdd1e2c | 2622 | |
7a3d1328 | 2623 | switch (event_type) { |
76d45b40 | 2624 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2625 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2626 | kchan, kernel_tracer_fd); |
7a3d1328 | 2627 | break; |
76d45b40 | 2628 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2629 | /* |
7a3d1328 MD |
2630 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2631 | * events already registered to the channel. | |
8c9ae521 | 2632 | */ |
7a3d1328 MD |
2633 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2634 | kchan, kernel_tracer_fd); | |
2635 | break; | |
76d45b40 | 2636 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2637 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2638 | ret = event_kernel_enable_all(session->kernel_session, |
2639 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2640 | break; |
2641 | default: | |
2642 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2643 | goto error; | |
8c9ae521 | 2644 | } |
8f69e5eb DG |
2645 | |
2646 | /* Manage return value */ | |
54d01ffb | 2647 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2648 | goto error; |
d36b8583 DG |
2649 | } |
2650 | ||
54d01ffb | 2651 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2652 | break; |
76d45b40 DG |
2653 | case LTTNG_DOMAIN_UST: |
2654 | { | |
2655 | struct lttng_channel *attr; | |
2656 | struct ltt_ust_channel *uchan; | |
2657 | struct ltt_ust_session *usess = session->ust_session; | |
2658 | ||
2659 | /* Get channel from global UST domain */ | |
2660 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2661 | channel_name); | |
2662 | if (uchan == NULL) { | |
2663 | /* Create default channel */ | |
2664 | attr = channel_new_default_attr(domain); | |
2665 | if (attr == NULL) { | |
2666 | ret = LTTCOMM_FATAL; | |
2667 | goto error; | |
2668 | } | |
2669 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2670 | attr->name[NAME_MAX - 1] = '\0'; | |
2671 | ||
2672 | /* Use the internal command enable channel */ | |
7885e399 | 2673 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2674 | if (ret != LTTCOMM_OK) { |
2675 | free(attr); | |
2676 | goto error; | |
2677 | } | |
2678 | free(attr); | |
2679 | ||
2680 | /* Get the newly created channel reference back */ | |
2681 | uchan = trace_ust_find_channel_by_name( | |
2682 | usess->domain_global.channels, channel_name); | |
2683 | if (uchan == NULL) { | |
2684 | /* Something is really wrong */ | |
2685 | ret = LTTCOMM_FATAL; | |
2686 | goto error; | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | /* At this point, the session and channel exist on the tracer */ | |
2691 | ||
2692 | switch (event_type) { | |
2693 | case LTTNG_EVENT_ALL: | |
2694 | case LTTNG_EVENT_TRACEPOINT: | |
2695 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2696 | if (ret != LTTCOMM_OK) { | |
2697 | goto error; | |
2698 | } | |
2699 | break; | |
2700 | default: | |
2701 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2702 | goto error; | |
2703 | } | |
2704 | ||
2705 | /* Manage return value */ | |
2706 | if (ret != LTTCOMM_OK) { | |
2707 | goto error; | |
2708 | } | |
2709 | ||
2710 | break; | |
2711 | } | |
d78d6610 | 2712 | #if 0 |
76d45b40 DG |
2713 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2714 | case LTTNG_DOMAIN_UST_PID: | |
2715 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2716 | #endif |
54d01ffb | 2717 | default: |
1ab1ea0b | 2718 | ret = LTTCOMM_UND; |
54d01ffb | 2719 | goto error; |
d36b8583 | 2720 | } |
f3ed775e | 2721 | |
54d01ffb DG |
2722 | ret = LTTCOMM_OK; |
2723 | ||
2724 | error: | |
2725 | return ret; | |
2726 | } | |
2727 | ||
2728 | /* | |
2729 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2730 | */ | |
2731 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2732 | { | |
2733 | int ret; | |
2734 | ssize_t nb_events = 0; | |
2735 | ||
2736 | switch (domain) { | |
2737 | case LTTNG_DOMAIN_KERNEL: | |
2738 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2739 | if (nb_events < 0) { | |
2740 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2741 | goto error; | |
894be886 | 2742 | } |
54d01ffb | 2743 | break; |
b551a063 DG |
2744 | case LTTNG_DOMAIN_UST: |
2745 | nb_events = ust_app_list_events(events); | |
2746 | if (nb_events < 0) { | |
2747 | ret = LTTCOMM_UST_LIST_FAIL; | |
2748 | goto error; | |
2749 | } | |
2750 | break; | |
54d01ffb | 2751 | default: |
1ab1ea0b | 2752 | ret = LTTCOMM_UND; |
54d01ffb DG |
2753 | goto error; |
2754 | } | |
894be886 | 2755 | |
54d01ffb | 2756 | return nb_events; |
7d29a247 | 2757 | |
54d01ffb DG |
2758 | error: |
2759 | /* Return negative value to differentiate return code */ | |
2760 | return -ret; | |
2761 | } | |
b389abbe | 2762 | |
54d01ffb DG |
2763 | /* |
2764 | * Command LTTNG_START_TRACE processed by the client thread. | |
2765 | */ | |
2766 | static int cmd_start_trace(struct ltt_session *session) | |
2767 | { | |
2768 | int ret; | |
54d01ffb | 2769 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2770 | struct ltt_ust_session *usess; |
b389abbe | 2771 | |
54d01ffb DG |
2772 | /* Short cut */ |
2773 | ksession = session->kernel_session; | |
b9d9b220 | 2774 | usess = session->ust_session; |
5eb91c98 | 2775 | |
b9ef1c83 DG |
2776 | if (session->enabled) { |
2777 | ret = LTTCOMM_UST_START_FAIL; | |
2778 | goto error; | |
2779 | } | |
2780 | ||
464dd62d MD |
2781 | session->enabled = 1; |
2782 | ||
54d01ffb DG |
2783 | /* Kernel tracing */ |
2784 | if (ksession != NULL) { | |
2bdd86d4 MD |
2785 | struct ltt_kernel_channel *kchan; |
2786 | ||
54d01ffb DG |
2787 | /* Open kernel metadata */ |
2788 | if (ksession->metadata == NULL) { | |
2789 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2790 | if (ret < 0) { | |
2791 | ret = LTTCOMM_KERN_META_FAIL; | |
2792 | goto error; | |
b389abbe | 2793 | } |
54d01ffb | 2794 | } |
7d29a247 | 2795 | |
54d01ffb DG |
2796 | /* Open kernel metadata stream */ |
2797 | if (ksession->metadata_stream_fd == 0) { | |
2798 | ret = kernel_open_metadata_stream(ksession); | |
2799 | if (ret < 0) { | |
2800 | ERR("Kernel create metadata stream failed"); | |
2801 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2802 | goto error; | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | /* For each channel */ | |
2807 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2808 | if (kchan->stream_count == 0) { | |
2809 | ret = kernel_open_channel_stream(kchan); | |
2810 | if (ret < 0) { | |
2811 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2812 | goto error; |
2813 | } | |
54d01ffb DG |
2814 | /* Update the stream global counter */ |
2815 | ksession->stream_count_global += ret; | |
7d29a247 | 2816 | } |
54d01ffb DG |
2817 | } |
2818 | ||
2819 | /* Setup kernel consumer socket and send fds to it */ | |
2820 | ret = init_kernel_tracing(ksession); | |
2821 | if (ret < 0) { | |
2822 | ret = LTTCOMM_KERN_START_FAIL; | |
2823 | goto error; | |
2824 | } | |
2825 | ||
2826 | /* This start the kernel tracing */ | |
2827 | ret = kernel_start_session(ksession); | |
2828 | if (ret < 0) { | |
2829 | ret = LTTCOMM_KERN_START_FAIL; | |
2830 | goto error; | |
2831 | } | |
2832 | ||
2833 | /* Quiescent wait after starting trace */ | |
2834 | kernel_wait_quiescent(kernel_tracer_fd); | |
2835 | } | |
2836 | ||
36dc12cc | 2837 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2838 | if (usess) { |
2839 | usess->start_trace = 1; | |
36dc12cc | 2840 | |
b9d9b220 DG |
2841 | ret = ust_app_start_trace_all(usess); |
2842 | if (ret < 0) { | |
2843 | ret = LTTCOMM_UST_START_FAIL; | |
2844 | goto error; | |
2845 | } | |
2bdd86d4 | 2846 | } |
54d01ffb DG |
2847 | |
2848 | ret = LTTCOMM_OK; | |
2849 | ||
2850 | error: | |
2851 | return ret; | |
2852 | } | |
2853 | ||
2854 | /* | |
2855 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2856 | */ | |
2857 | static int cmd_stop_trace(struct ltt_session *session) | |
2858 | { | |
2859 | int ret; | |
2860 | struct ltt_kernel_channel *kchan; | |
2861 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2862 | struct ltt_ust_session *usess; |
54d01ffb DG |
2863 | |
2864 | /* Short cut */ | |
2865 | ksession = session->kernel_session; | |
8be98f9a | 2866 | usess = session->ust_session; |
54d01ffb | 2867 | |
b9ef1c83 | 2868 | if (!session->enabled) { |
190df5ac | 2869 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2870 | goto error; |
2871 | } | |
2872 | ||
464dd62d MD |
2873 | session->enabled = 0; |
2874 | ||
54d01ffb DG |
2875 | /* Kernel tracer */ |
2876 | if (ksession != NULL) { | |
2877 | DBG("Stop kernel tracing"); | |
2878 | ||
2879 | /* Flush all buffers before stopping */ | |
2880 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2881 | if (ret < 0) { | |
2882 | ERR("Kernel metadata flush failed"); | |
2883 | } | |
f34daff7 | 2884 | |
54d01ffb DG |
2885 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2886 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2887 | if (ret < 0) { |
54d01ffb | 2888 | ERR("Kernel flush buffer error"); |
7d29a247 | 2889 | } |
54d01ffb | 2890 | } |
19e70852 | 2891 | |
54d01ffb DG |
2892 | ret = kernel_stop_session(ksession); |
2893 | if (ret < 0) { | |
2894 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2895 | goto error; |
f3ed775e | 2896 | } |
54d01ffb DG |
2897 | |
2898 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2899 | } |
54d01ffb | 2900 | |
8be98f9a MD |
2901 | if (usess) { |
2902 | usess->start_trace = 0; | |
2bdd86d4 | 2903 | |
8be98f9a | 2904 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2905 | if (ret < 0) { |
190df5ac | 2906 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2907 | goto error; |
2908 | } | |
2bdd86d4 | 2909 | } |
54d01ffb DG |
2910 | |
2911 | ret = LTTCOMM_OK; | |
2912 | ||
2913 | error: | |
2914 | return ret; | |
2915 | } | |
2916 | ||
2917 | /* | |
2918 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2919 | */ | |
730389d9 | 2920 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
2921 | { |
2922 | int ret; | |
2923 | ||
730389d9 DG |
2924 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
2925 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
2926 | if (ret != LTTCOMM_OK) { |
2927 | goto error; | |
2928 | } | |
2929 | ||
2930 | ret = LTTCOMM_OK; | |
2931 | ||
2932 | error: | |
2933 | return ret; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2938 | */ | |
2939 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2940 | { | |
2941 | int ret; | |
2942 | ||
2943 | /* Clean kernel session teardown */ | |
2944 | teardown_kernel_session(session); | |
84cd17c6 MD |
2945 | /* UST session teardown */ |
2946 | teardown_ust_session(session); | |
54d01ffb DG |
2947 | |
2948 | /* | |
2949 | * Must notify the kernel thread here to update it's poll setin order | |
2950 | * to remove the channel(s)' fd just destroyed. | |
2951 | */ | |
2952 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2953 | if (ret < 0) { | |
2954 | perror("write kernel poll pipe"); | |
2955 | } | |
2956 | ||
271933a4 | 2957 | ret = session_destroy(session); |
54d01ffb DG |
2958 | |
2959 | return ret; | |
2960 | } | |
2961 | ||
2962 | /* | |
2963 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2964 | */ | |
2965 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2966 | { | |
2967 | int ret; | |
2968 | ||
2969 | switch (domain) { | |
2970 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2971 | { |
54d01ffb | 2972 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2973 | |
54d01ffb DG |
2974 | kcalibrate.type = calibrate->type; |
2975 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2976 | if (ret < 0) { |
54d01ffb DG |
2977 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2978 | goto error; | |
33a2b854 | 2979 | } |
54d01ffb DG |
2980 | break; |
2981 | } | |
4466912f DG |
2982 | case LTTNG_DOMAIN_UST: |
2983 | { | |
2984 | struct lttng_ust_calibrate ucalibrate; | |
2985 | ||
2986 | ucalibrate.type = calibrate->type; | |
2987 | ret = ust_app_calibrate_glb(&ucalibrate); | |
2988 | if (ret < 0) { | |
2989 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
2990 | goto error; | |
2991 | } | |
2992 | break; | |
2993 | } | |
54d01ffb | 2994 | default: |
1ab1ea0b | 2995 | ret = LTTCOMM_UND; |
54d01ffb DG |
2996 | goto error; |
2997 | } | |
33a2b854 | 2998 | |
54d01ffb | 2999 | ret = LTTCOMM_OK; |
33a2b854 | 3000 | |
54d01ffb DG |
3001 | error: |
3002 | return ret; | |
3003 | } | |
7d29a247 | 3004 | |
54d01ffb DG |
3005 | /* |
3006 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3007 | */ | |
3008 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3009 | char *sock_path) | |
3010 | { | |
3011 | int ret, sock; | |
b389abbe | 3012 | |
54d01ffb DG |
3013 | switch (domain) { |
3014 | case LTTNG_DOMAIN_KERNEL: | |
3015 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3016 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3017 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3018 | goto error; | |
3019 | } | |
3020 | ||
3021 | sock = lttcomm_connect_unix_sock(sock_path); | |
3022 | if (sock < 0) { | |
3023 | ret = LTTCOMM_CONNECT_FAIL; | |
3024 | goto error; | |
3025 | } | |
3026 | ||
3027 | session->kernel_session->consumer_fd = sock; | |
3028 | break; | |
3029 | default: | |
3030 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3031 | ret = LTTCOMM_UND; |
54d01ffb DG |
3032 | goto error; |
3033 | } | |
3034 | ||
3035 | ret = LTTCOMM_OK; | |
3036 | ||
3037 | error: | |
3038 | return ret; | |
3039 | } | |
3040 | ||
3041 | /* | |
3042 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3043 | */ | |
3044 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3045 | struct lttng_domain **domains) | |
3046 | { | |
b551a063 | 3047 | int ret, index = 0; |
54d01ffb DG |
3048 | ssize_t nb_dom = 0; |
3049 | ||
3050 | if (session->kernel_session != NULL) { | |
b551a063 | 3051 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3052 | nb_dom++; |
3053 | } | |
3054 | ||
b551a063 DG |
3055 | if (session->ust_session != NULL) { |
3056 | DBG3("Listing domains found UST global domain"); | |
3057 | nb_dom++; | |
3058 | } | |
54d01ffb | 3059 | |
b551a063 | 3060 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3061 | if (*domains == NULL) { |
3062 | ret = -LTTCOMM_FATAL; | |
3063 | goto error; | |
3064 | } | |
3065 | ||
b551a063 DG |
3066 | if (session->kernel_session != NULL) { |
3067 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3068 | index++; | |
3069 | } | |
3070 | ||
3071 | if (session->ust_session != NULL) { | |
3072 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3073 | index++; | |
3074 | } | |
54d01ffb | 3075 | |
54d01ffb DG |
3076 | return nb_dom; |
3077 | ||
3078 | error: | |
3079 | return ret; | |
3080 | } | |
3081 | ||
3082 | /* | |
3083 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3084 | */ | |
b551a063 | 3085 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3086 | struct lttng_channel **channels) |
3087 | { | |
3088 | int ret; | |
3089 | ssize_t nb_chan = 0; | |
3090 | ||
b551a063 DG |
3091 | switch (domain) { |
3092 | case LTTNG_DOMAIN_KERNEL: | |
3093 | if (session->kernel_session != NULL) { | |
3094 | nb_chan = session->kernel_session->channel_count; | |
3095 | } | |
0df502fd | 3096 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3097 | break; |
3098 | case LTTNG_DOMAIN_UST: | |
3099 | if (session->ust_session != NULL) { | |
bec39940 | 3100 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3101 | session->ust_session->domain_global.channels); |
3102 | } | |
0df502fd | 3103 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3104 | break; |
3105 | default: | |
3106 | *channels = NULL; | |
1ab1ea0b | 3107 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3108 | goto error; |
3109 | } | |
3110 | ||
b551a063 DG |
3111 | if (nb_chan > 0) { |
3112 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3113 | if (*channels == NULL) { | |
3114 | ret = -LTTCOMM_FATAL; | |
3115 | goto error; | |
3116 | } | |
54d01ffb | 3117 | |
b551a063 DG |
3118 | list_lttng_channels(domain, session, *channels); |
3119 | } else { | |
3120 | *channels = NULL; | |
3121 | } | |
2bdd86d4 | 3122 | |
54d01ffb DG |
3123 | return nb_chan; |
3124 | ||
3125 | error: | |
3126 | return ret; | |
3127 | } | |
3128 | ||
3129 | /* | |
3130 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3131 | */ | |
b551a063 | 3132 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3133 | char *channel_name, struct lttng_event **events) |
3134 | { | |
b551a063 | 3135 | int ret = 0; |
54d01ffb | 3136 | ssize_t nb_event = 0; |
54d01ffb | 3137 | |
b551a063 DG |
3138 | switch (domain) { |
3139 | case LTTNG_DOMAIN_KERNEL: | |
3140 | if (session->kernel_session != NULL) { | |
3141 | nb_event = list_lttng_kernel_events(channel_name, | |
3142 | session->kernel_session, events); | |
54d01ffb | 3143 | } |
b551a063 DG |
3144 | break; |
3145 | case LTTNG_DOMAIN_UST: | |
3146 | { | |
3147 | if (session->ust_session != NULL) { | |
3148 | nb_event = list_lttng_ust_global_events(channel_name, | |
3149 | &session->ust_session->domain_global, events); | |
3150 | } | |
3151 | break; | |
54d01ffb | 3152 | } |
b551a063 | 3153 | default: |
1ab1ea0b | 3154 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3155 | goto error; |
3156 | } | |
3157 | ||
b551a063 | 3158 | ret = nb_event; |
54d01ffb DG |
3159 | |
3160 | error: | |
3161 | return ret; | |
3162 | } | |
3163 | ||
3164 | /* | |
3165 | * Process the command requested by the lttng client within the command | |
3166 | * context structure. This function make sure that the return structure (llm) | |
3167 | * is set and ready for transmission before returning. | |
3168 | * | |
3169 | * Return any error encountered or 0 for success. | |
3170 | */ | |
3171 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3172 | { | |
3173 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3174 | int need_tracing_session = 1; |
2e09ba09 | 3175 | int need_domain; |
54d01ffb DG |
3176 | |
3177 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3178 | ||
2e09ba09 MD |
3179 | switch (cmd_ctx->lsm->cmd_type) { |
3180 | case LTTNG_CREATE_SESSION: | |
3181 | case LTTNG_DESTROY_SESSION: | |
3182 | case LTTNG_LIST_SESSIONS: | |
3183 | case LTTNG_LIST_DOMAINS: | |
3184 | case LTTNG_START_TRACE: | |
3185 | case LTTNG_STOP_TRACE: | |
3186 | need_domain = 0; | |
3aace903 | 3187 | break; |
2e09ba09 MD |
3188 | default: |
3189 | need_domain = 1; | |
3190 | } | |
3191 | ||
3192 | if (opt_no_kernel && need_domain | |
3193 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
4fba7219 DG |
3194 | ret = LTTCOMM_KERN_NA; |
3195 | goto error; | |
3196 | } | |
3197 | ||
54d01ffb DG |
3198 | /* |
3199 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3200 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3201 | * command. |
3202 | */ | |
3203 | switch(cmd_ctx->lsm->cmd_type) { | |
3204 | case LTTNG_LIST_SESSIONS: | |
3205 | case LTTNG_LIST_TRACEPOINTS: | |
3206 | case LTTNG_LIST_DOMAINS: | |
3207 | case LTTNG_LIST_CHANNELS: | |
3208 | case LTTNG_LIST_EVENTS: | |
3209 | break; | |
3210 | default: | |
3211 | /* Setup lttng message with no payload */ | |
3212 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3213 | if (ret < 0) { | |
3214 | /* This label does not try to unlock the session */ | |
3215 | goto init_setup_error; | |
3216 | } | |
3217 | } | |
3218 | ||
3219 | /* Commands that DO NOT need a session. */ | |
3220 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3221 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3222 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3223 | case LTTNG_LIST_SESSIONS: |
3224 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3225 | need_tracing_session = 0; |
54d01ffb DG |
3226 | break; |
3227 | default: | |
3228 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3229 | session_lock_list(); |
54d01ffb | 3230 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3231 | session_unlock_list(); |
54d01ffb DG |
3232 | if (cmd_ctx->session == NULL) { |
3233 | if (cmd_ctx->lsm->session.name != NULL) { | |
3234 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3235 | } else { | |
3236 | /* If no session name specified */ | |
3237 | ret = LTTCOMM_SELECT_SESS; | |
3238 | } | |
3239 | goto error; | |
3240 | } else { | |
3241 | /* Acquire lock for the session */ | |
3242 | session_lock(cmd_ctx->session); | |
3243 | } | |
3244 | break; | |
3245 | } | |
b389abbe | 3246 | |
2e09ba09 MD |
3247 | if (!need_domain) { |
3248 | goto skip_domain; | |
3249 | } | |
54d01ffb DG |
3250 | /* |
3251 | * Check domain type for specific "pre-action". | |
3252 | */ | |
3253 | switch (cmd_ctx->lsm->domain.type) { | |
3254 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 DG |
3255 | if (!is_root) { |
3256 | ret = LTTCOMM_KERN_NA; | |
3257 | goto error; | |
3258 | } | |
3259 | ||
54d01ffb DG |
3260 | /* Kernel tracer check */ |
3261 | if (kernel_tracer_fd == 0) { | |
3262 | /* Basically, load kernel tracer modules */ | |
096102bd DG |
3263 | ret = init_kernel_tracer(); |
3264 | if (ret != 0) { | |
54d01ffb DG |
3265 | goto error; |
3266 | } | |
3267 | } | |
5eb91c98 | 3268 | |
54d01ffb | 3269 | /* Need a session for kernel command */ |
44d3bd01 | 3270 | if (need_tracing_session) { |
54d01ffb | 3271 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3272 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3273 | if (ret < 0) { |
54d01ffb | 3274 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3275 | goto error; |
3276 | } | |
b389abbe | 3277 | } |
7d29a247 | 3278 | |
54d01ffb | 3279 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3280 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3281 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3282 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3283 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3284 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3285 | if (ret < 0) { |
54d01ffb DG |
3286 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3287 | goto error; | |
950131af | 3288 | } |
3ff2ecac MD |
3289 | } else { |
3290 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3291 | } |
0d0c377a | 3292 | } |
54d01ffb | 3293 | break; |
2bdd86d4 | 3294 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3295 | { |
44d3bd01 | 3296 | if (need_tracing_session) { |
f6a9efaa | 3297 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3298 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3299 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3300 | if (ret != LTTCOMM_OK) { |
3301 | goto error; | |
3302 | } | |
3303 | } | |
7753dea8 MD |
3304 | /* Start the UST consumer daemons */ |
3305 | /* 64-bit */ | |
3306 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3307 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3308 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3309 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3310 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3311 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3312 | if (ret < 0) { |
7753dea8 MD |
3313 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3314 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3315 | goto error; |
3316 | } | |
48842b30 | 3317 | |
7753dea8 | 3318 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3319 | } else { |
7753dea8 MD |
3320 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3321 | } | |
3322 | /* 32-bit */ | |
fc7a59ce | 3323 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3324 | ustconsumer32_data.pid == 0 && |
3325 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3326 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3327 | ret = start_consumerd(&ustconsumer32_data); | |
3328 | if (ret < 0) { | |
3329 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3330 | ust_consumerd32_fd = -EINVAL; | |
3331 | goto error; | |
3332 | } | |
3333 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3334 | } else { | |
3335 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3336 | } |
44d3bd01 DG |
3337 | } |
3338 | break; | |
48842b30 | 3339 | } |
54d01ffb | 3340 | default: |
54d01ffb DG |
3341 | break; |
3342 | } | |
2e09ba09 | 3343 | skip_domain: |
33a2b854 | 3344 | |
8e0af1b4 MD |
3345 | /* |
3346 | * Check that the UID or GID match that of the tracing session. | |
3347 | * The root user can interact with all sessions. | |
3348 | */ | |
3349 | if (need_tracing_session) { | |
3350 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3351 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3352 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3353 | ret = LTTCOMM_EPERM; |
3354 | goto error; | |
3355 | } | |
3356 | } | |
3357 | ||
54d01ffb DG |
3358 | /* Process by command type */ |
3359 | switch (cmd_ctx->lsm->cmd_type) { | |
3360 | case LTTNG_ADD_CONTEXT: | |
3361 | { | |
3362 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3363 | cmd_ctx->lsm->u.context.channel_name, | |
3364 | cmd_ctx->lsm->u.context.event_name, | |
3365 | &cmd_ctx->lsm->u.context.ctx); | |
3366 | break; | |
3367 | } | |
3368 | case LTTNG_DISABLE_CHANNEL: | |
3369 | { | |
3370 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3371 | cmd_ctx->lsm->u.disable.channel_name); | |
3372 | break; | |
3373 | } | |
3374 | case LTTNG_DISABLE_EVENT: | |
3375 | { | |
3376 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3377 | cmd_ctx->lsm->u.disable.channel_name, | |
3378 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3379 | break; |
3380 | } | |
54d01ffb DG |
3381 | case LTTNG_DISABLE_ALL_EVENT: |
3382 | { | |
2bdd86d4 | 3383 | DBG("Disabling all events"); |
54d01ffb DG |
3384 | |
3385 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3386 | cmd_ctx->lsm->u.disable.channel_name); | |
3387 | break; | |
3388 | } | |
3389 | case LTTNG_ENABLE_CHANNEL: | |
3390 | { | |
aea829b3 | 3391 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3392 | &cmd_ctx->lsm->u.channel.chan); |
3393 | break; | |
3394 | } | |
3395 | case LTTNG_ENABLE_EVENT: | |
3396 | { | |
3397 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3398 | cmd_ctx->lsm->u.enable.channel_name, | |
3399 | &cmd_ctx->lsm->u.enable.event); | |
3400 | break; | |
3401 | } | |
3402 | case LTTNG_ENABLE_ALL_EVENT: | |
3403 | { | |
2bdd86d4 | 3404 | DBG("Enabling all events"); |
54d01ffb DG |
3405 | |
3406 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3407 | cmd_ctx->lsm->u.enable.channel_name, |
3408 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3409 | break; |
3410 | } | |
052da939 | 3411 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3412 | { |
9f19cc17 | 3413 | struct lttng_event *events; |
54d01ffb | 3414 | ssize_t nb_events; |
052da939 | 3415 | |
54d01ffb DG |
3416 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3417 | if (nb_events < 0) { | |
3418 | ret = -nb_events; | |
3419 | goto error; | |
2ef84c95 DG |
3420 | } |
3421 | ||
3422 | /* | |
3423 | * Setup lttng message with payload size set to the event list size in | |
3424 | * bytes and then copy list into the llm payload. | |
3425 | */ | |
052da939 | 3426 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3427 | if (ret < 0) { |
052da939 | 3428 | free(events); |
2ef84c95 DG |
3429 | goto setup_error; |
3430 | } | |
3431 | ||
3432 | /* Copy event list into message payload */ | |
9f19cc17 | 3433 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3434 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3435 | |
9f19cc17 | 3436 | free(events); |
2ef84c95 DG |
3437 | |
3438 | ret = LTTCOMM_OK; | |
3439 | break; | |
3440 | } | |
f3ed775e | 3441 | case LTTNG_START_TRACE: |
8c0faa1d | 3442 | { |
54d01ffb | 3443 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3444 | break; |
3445 | } | |
f3ed775e | 3446 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3447 | { |
54d01ffb | 3448 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3449 | break; |
3450 | } | |
5e16da05 MD |
3451 | case LTTNG_CREATE_SESSION: |
3452 | { | |
54d01ffb | 3453 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3454 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3455 | break; |
3456 | } | |
3457 | case LTTNG_DESTROY_SESSION: | |
3458 | { | |
54d01ffb DG |
3459 | ret = cmd_destroy_session(cmd_ctx->session, |
3460 | cmd_ctx->lsm->session.name); | |
5461b305 | 3461 | break; |
5e16da05 | 3462 | } |
9f19cc17 | 3463 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3464 | { |
54d01ffb DG |
3465 | ssize_t nb_dom; |
3466 | struct lttng_domain *domains; | |
5461b305 | 3467 | |
54d01ffb DG |
3468 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3469 | if (nb_dom < 0) { | |
3470 | ret = -nb_dom; | |
3471 | goto error; | |
ce3d728c | 3472 | } |
520ff687 | 3473 | |
54d01ffb | 3474 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3475 | if (ret < 0) { |
3476 | goto setup_error; | |
520ff687 | 3477 | } |
57167058 | 3478 | |
54d01ffb DG |
3479 | /* Copy event list into message payload */ |
3480 | memcpy(cmd_ctx->llm->payload, domains, | |
3481 | nb_dom * sizeof(struct lttng_domain)); | |
3482 | ||
3483 | free(domains); | |
5e16da05 | 3484 | |
5461b305 | 3485 | ret = LTTCOMM_OK; |
5e16da05 MD |
3486 | break; |
3487 | } | |
9f19cc17 | 3488 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3489 | { |
54d01ffb DG |
3490 | size_t nb_chan; |
3491 | struct lttng_channel *channels; | |
3492 | ||
b551a063 DG |
3493 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3494 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3495 | if (nb_chan < 0) { |
3496 | ret = -nb_chan; | |
3497 | goto error; | |
5461b305 | 3498 | } |
ca95a216 | 3499 | |
54d01ffb | 3500 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3501 | if (ret < 0) { |
3502 | goto setup_error; | |
3503 | } | |
9f19cc17 | 3504 | |
54d01ffb DG |
3505 | /* Copy event list into message payload */ |
3506 | memcpy(cmd_ctx->llm->payload, channels, | |
3507 | nb_chan * sizeof(struct lttng_channel)); | |
3508 | ||
3509 | free(channels); | |
9f19cc17 DG |
3510 | |
3511 | ret = LTTCOMM_OK; | |
5461b305 | 3512 | break; |
5e16da05 | 3513 | } |
9f19cc17 | 3514 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3515 | { |
b551a063 | 3516 | ssize_t nb_event; |
684d34d2 | 3517 | struct lttng_event *events = NULL; |
9f19cc17 | 3518 | |
b551a063 | 3519 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3520 | cmd_ctx->lsm->u.list.channel_name, &events); |
3521 | if (nb_event < 0) { | |
3522 | ret = -nb_event; | |
3523 | goto error; | |
5461b305 | 3524 | } |
ca95a216 | 3525 | |
54d01ffb | 3526 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3527 | if (ret < 0) { |
3528 | goto setup_error; | |
3529 | } | |
9f19cc17 | 3530 | |
54d01ffb DG |
3531 | /* Copy event list into message payload */ |
3532 | memcpy(cmd_ctx->llm->payload, events, | |
3533 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3534 | |
54d01ffb | 3535 | free(events); |
9f19cc17 DG |
3536 | |
3537 | ret = LTTCOMM_OK; | |
5461b305 | 3538 | break; |
5e16da05 MD |
3539 | } |
3540 | case LTTNG_LIST_SESSIONS: | |
3541 | { | |
8e0af1b4 | 3542 | unsigned int nr_sessions; |
5461b305 | 3543 | |
8e0af1b4 | 3544 | session_lock_list(); |
730389d9 DG |
3545 | nr_sessions = lttng_sessions_count( |
3546 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3547 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3548 | |
8e0af1b4 | 3549 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3550 | if (ret < 0) { |
54d01ffb | 3551 | session_unlock_list(); |
5461b305 | 3552 | goto setup_error; |
e065084a | 3553 | } |
5e16da05 | 3554 | |
6c9cc2ab | 3555 | /* Filled the session array */ |
8e0af1b4 | 3556 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3557 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3558 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3559 | |
54d01ffb | 3560 | session_unlock_list(); |
5e16da05 | 3561 | |
5461b305 | 3562 | ret = LTTCOMM_OK; |
5e16da05 MD |
3563 | break; |
3564 | } | |
d0254c7c MD |
3565 | case LTTNG_CALIBRATE: |
3566 | { | |
54d01ffb DG |
3567 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3568 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3569 | break; |
3570 | } | |
d9800920 DG |
3571 | case LTTNG_REGISTER_CONSUMER: |
3572 | { | |
54d01ffb DG |
3573 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3574 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3575 | break; |
3576 | } | |
5e16da05 | 3577 | default: |
5e16da05 | 3578 | ret = LTTCOMM_UND; |
5461b305 | 3579 | break; |
fac6795d DG |
3580 | } |
3581 | ||
5461b305 | 3582 | error: |
5461b305 DG |
3583 | if (cmd_ctx->llm == NULL) { |
3584 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3585 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3586 | goto setup_error; |
3587 | } | |
3588 | } | |
54d01ffb | 3589 | /* Set return code */ |
5461b305 | 3590 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3591 | setup_error: |
b5541356 | 3592 | if (cmd_ctx->session) { |
54d01ffb | 3593 | session_unlock(cmd_ctx->session); |
b5541356 | 3594 | } |
54d01ffb | 3595 | init_setup_error: |
8028d920 | 3596 | return ret; |
fac6795d DG |
3597 | } |
3598 | ||
1d4b027a | 3599 | /* |
d063d709 DG |
3600 | * This thread manage all clients request using the unix client socket for |
3601 | * communication. | |
1d4b027a DG |
3602 | */ |
3603 | static void *thread_manage_clients(void *data) | |
3604 | { | |
5eb91c98 DG |
3605 | int sock = 0, ret, i, pollfd; |
3606 | uint32_t revents, nb_fd; | |
273ea72c | 3607 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3608 | struct lttng_poll_event events; |
1d4b027a DG |
3609 | |
3610 | DBG("[thread] Manage client started"); | |
3611 | ||
f6a9efaa DG |
3612 | rcu_register_thread(); |
3613 | ||
1d4b027a DG |
3614 | ret = lttcomm_listen_unix_sock(client_sock); |
3615 | if (ret < 0) { | |
3616 | goto error; | |
3617 | } | |
3618 | ||
5eb91c98 DG |
3619 | /* |
3620 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3621 | * more will be added to this poll set. | |
3622 | */ | |
3623 | ret = create_thread_poll_set(&events, 2); | |
3624 | if (ret < 0) { | |
3625 | goto error; | |
3626 | } | |
273ea72c | 3627 | |
5eb91c98 DG |
3628 | /* Add the application registration socket */ |
3629 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3630 | if (ret < 0) { | |
3631 | goto error; | |
3632 | } | |
273ea72c | 3633 | |
bbd973c2 DG |
3634 | /* |
3635 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3636 | */ |
3637 | if (opt_sig_parent) { | |
8db8d1dc | 3638 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3639 | } |
3640 | ||
3641 | while (1) { | |
1d4b027a | 3642 | DBG("Accepting client command ..."); |
273ea72c | 3643 | |
5eb91c98 DG |
3644 | nb_fd = LTTNG_POLL_GETNB(&events); |
3645 | ||
273ea72c | 3646 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3647 | restart: |
5eb91c98 | 3648 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3649 | if (ret < 0) { |
88f2b785 MD |
3650 | /* |
3651 | * Restart interrupted system call. | |
3652 | */ | |
3653 | if (errno == EINTR) { | |
3654 | goto restart; | |
3655 | } | |
273ea72c DG |
3656 | goto error; |
3657 | } | |
3658 | ||
5eb91c98 DG |
3659 | for (i = 0; i < nb_fd; i++) { |
3660 | /* Fetch once the poll data */ | |
3661 | revents = LTTNG_POLL_GETEV(&events, i); | |
3662 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3663 | ||
3664 | /* Thread quit pipe has been closed. Killing thread. */ | |
3665 | ret = check_thread_quit_pipe(pollfd, revents); | |
3666 | if (ret) { | |
3667 | goto error; | |
3668 | } | |
3669 | ||
3670 | /* Event on the registration socket */ | |
3671 | if (pollfd == client_sock) { | |
3672 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3673 | ERR("Client socket poll error"); | |
3674 | goto error; | |
3675 | } | |
3676 | } | |
3677 | } | |
3678 | ||
3679 | DBG("Wait for client response"); | |
3680 | ||
3681 | sock = lttcomm_accept_unix_sock(client_sock); | |
3682 | if (sock < 0) { | |
273ea72c | 3683 | goto error; |
273ea72c DG |
3684 | } |
3685 | ||
be040666 DG |
3686 | /* Set socket option for credentials retrieval */ |
3687 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3688 | if (ret < 0) { | |
3689 | goto error; | |
3690 | } | |
3691 | ||
5eb91c98 | 3692 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3693 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3694 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3695 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3696 | goto error; |
5eb91c98 | 3697 | } |
1d4b027a | 3698 | |
5eb91c98 | 3699 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3700 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3701 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3702 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3703 | goto error; |
3704 | } | |
1d4b027a | 3705 | |
5eb91c98 DG |
3706 | cmd_ctx->llm = NULL; |
3707 | cmd_ctx->session = NULL; | |
1d4b027a | 3708 | |
5eb91c98 DG |
3709 | /* |
3710 | * Data is received from the lttng client. The struct | |
3711 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3712 | * the client. | |
3713 | */ | |
3714 | DBG("Receiving data from client ..."); | |
be040666 DG |
3715 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3716 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3717 | if (ret <= 0) { |
3718 | DBG("Nothing recv() from client... continuing"); | |
3719 | close(sock); | |
3720 | free(cmd_ctx); | |
3721 | continue; | |
3722 | } | |
1d4b027a | 3723 | |
5eb91c98 DG |
3724 | // TODO: Validate cmd_ctx including sanity check for |
3725 | // security purpose. | |
f7776ea7 | 3726 | |
f6a9efaa | 3727 | rcu_thread_online(); |
5eb91c98 DG |
3728 | /* |
3729 | * This function dispatch the work to the kernel or userspace tracer | |
3730 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3731 | * informations for the client. The command context struct contains | |
3732 | * everything this function may needs. | |
3733 | */ | |
3734 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3735 | rcu_thread_offline(); |
5eb91c98 | 3736 | if (ret < 0) { |
bbd973c2 | 3737 | /* |
5eb91c98 | 3738 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3739 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3740 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3741 | */ |
bbd973c2 | 3742 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3743 | continue; |
3744 | } | |
d6e4fca4 | 3745 | |
54d01ffb DG |
3746 | DBG("Sending response (size: %d, retcode: %s)", |
3747 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3748 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3749 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3750 | if (ret < 0) { |
3751 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3752 | } |
1d4b027a | 3753 | |
5eb91c98 | 3754 | /* End of transmission */ |
273ea72c | 3755 | close(sock); |
be040666 DG |
3756 | |
3757 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3758 | } |
3759 | ||
5eb91c98 DG |
3760 | error: |
3761 | DBG("Client thread dying"); | |
273ea72c | 3762 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3763 | close(client_sock); |
3764 | close(sock); | |
273ea72c | 3765 | |
5eb91c98 | 3766 | lttng_poll_clean(&events); |
a2fb29a5 | 3767 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3768 | |
3769 | rcu_unregister_thread(); | |
1d4b027a DG |
3770 | return NULL; |
3771 | } | |
3772 | ||
3773 | ||
fac6795d DG |
3774 | /* |
3775 | * usage function on stderr | |
3776 | */ | |
3777 | static void usage(void) | |
3778 | { | |
b716ce68 | 3779 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3780 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3781 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3782 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3783 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3784 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3785 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3786 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3787 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3788 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3789 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3790 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3791 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3792 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3793 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3794 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3795 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3796 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3797 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3798 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3799 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3800 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3801 | } |
3802 | ||
3803 | /* | |
3804 | * daemon argument parsing | |
3805 | */ | |
3806 | static int parse_args(int argc, char **argv) | |
3807 | { | |
3808 | int c; | |
3809 | ||
3810 | static struct option long_options[] = { | |
3811 | { "client-sock", 1, 0, 'c' }, | |
3812 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3813 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3814 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3815 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3816 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3817 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3818 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3819 | { "consumerd32-path", 1, 0, 'u' }, | |
3820 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3821 | { "consumerd64-path", 1, 0, 't' }, | |
3822 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3823 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3824 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3825 | { "help", 0, 0, 'h' }, |
3826 | { "group", 1, 0, 'g' }, | |
3827 | { "version", 0, 0, 'V' }, | |
75462a81 | 3828 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3829 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3830 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3831 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3832 | { NULL, 0, 0, 0 } |
3833 | }; | |
3834 | ||
3835 | while (1) { | |
3836 | int option_index = 0; | |
4fba7219 | 3837 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3838 | long_options, &option_index); |
fac6795d DG |
3839 | if (c == -1) { |
3840 | break; | |
3841 | } | |
3842 | ||
3843 | switch (c) { | |
3844 | case 0: | |
3845 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3846 | if (optarg) { | |
3847 | fprintf(stderr, " with arg %s\n", optarg); | |
3848 | } | |
3849 | break; | |
b716ce68 | 3850 | case 'c': |
fac6795d DG |
3851 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3852 | break; | |
3853 | case 'a': | |
3854 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3855 | break; | |
3856 | case 'd': | |
3857 | opt_daemon = 1; | |
3858 | break; | |
3859 | case 'g': | |
fb09408a | 3860 | opt_tracing_group = optarg; |
fac6795d DG |
3861 | break; |
3862 | case 'h': | |
3863 | usage(); | |
3864 | exit(EXIT_FAILURE); | |
3865 | case 'V': | |
3866 | fprintf(stdout, "%s\n", VERSION); | |
3867 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3868 | case 'S': |
3869 | opt_sig_parent = 1; | |
3870 | break; | |
d6f42150 | 3871 | case 'E': |
3bd1e081 | 3872 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3873 | break; |
3874 | case 'C': | |
3bd1e081 MD |
3875 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3876 | break; | |
3877 | case 'F': | |
7753dea8 | 3878 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3879 | break; |
3880 | case 'D': | |
7753dea8 MD |
3881 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3882 | break; | |
3883 | case 'H': | |
3884 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3885 | break; | |
3886 | case 'G': | |
3887 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3888 | break; |
4fba7219 DG |
3889 | case 'N': |
3890 | opt_no_kernel = 1; | |
3891 | break; | |
75462a81 DG |
3892 | case 'q': |
3893 | opt_quiet = 1; | |
3894 | break; | |
3f9947db | 3895 | case 'v': |
53086306 DG |
3896 | /* Verbose level can increase using multiple -v */ |
3897 | opt_verbose += 1; | |
3f9947db | 3898 | break; |
31f73cc9 | 3899 | case 'Z': |
3bd1e081 | 3900 | opt_verbose_consumer += 1; |
31f73cc9 | 3901 | break; |
fb09408a | 3902 | case 'u': |
fc7a59ce | 3903 | consumerd32_bin= optarg; |
ebaeda94 MD |
3904 | break; |
3905 | case 'U': | |
3906 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3907 | break; |
3908 | case 't': | |
fc7a59ce | 3909 | consumerd64_bin = optarg; |
ebaeda94 MD |
3910 | break; |
3911 | case 'T': | |
3912 | consumerd64_libdir = optarg; | |
fb09408a | 3913 | break; |
fac6795d DG |
3914 | default: |
3915 | /* Unknown option or other error. | |
3916 | * Error is printed by getopt, just return */ | |
3917 | return -1; | |
3918 | } | |
3919 | } | |
3920 | ||
3921 | return 0; | |
3922 | } | |
3923 | ||
3924 | /* | |
d063d709 | 3925 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3926 | * apps_sock - The communication socket for all UST apps. |
3927 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3928 | */ |
cf3af59e | 3929 | static int init_daemon_socket(void) |
fac6795d DG |
3930 | { |
3931 | int ret = 0; | |
3932 | mode_t old_umask; | |
3933 | ||
3934 | old_umask = umask(0); | |
3935 | ||
3936 | /* Create client tool unix socket */ | |
d6f42150 DG |
3937 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3938 | if (client_sock < 0) { | |
3939 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3940 | ret = -1; |
3941 | goto end; | |
3942 | } | |
3943 | ||
3944 | /* File permission MUST be 660 */ | |
3945 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3946 | if (ret < 0) { | |
d6f42150 | 3947 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3948 | perror("chmod"); |
3949 | goto end; | |
3950 | } | |
3951 | ||
3952 | /* Create the application unix socket */ | |
d6f42150 DG |
3953 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3954 | if (apps_sock < 0) { | |
3955 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3956 | ret = -1; |
3957 | goto end; | |
3958 | } | |
3959 | ||
d6f42150 | 3960 | /* File permission MUST be 666 */ |
54d01ffb DG |
3961 | ret = chmod(apps_unix_sock_path, |
3962 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3963 | if (ret < 0) { |
d6f42150 | 3964 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3965 | perror("chmod"); |
3966 | goto end; | |
3967 | } | |
3968 | ||
3969 | end: | |
3970 | umask(old_umask); | |
3971 | return ret; | |
3972 | } | |
3973 | ||
3974 | /* | |
54d01ffb DG |
3975 | * Check if the global socket is available, and if a daemon is answering at the |
3976 | * other side. If yes, error is returned. | |
fac6795d | 3977 | */ |
cf3af59e | 3978 | static int check_existing_daemon(void) |
fac6795d | 3979 | { |
7d8234d9 | 3980 | /* Is there anybody out there ? */ |
099e26bd | 3981 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3982 | return -EEXIST; |
099e26bd | 3983 | } |
b09c7c76 DG |
3984 | |
3985 | return 0; | |
fac6795d DG |
3986 | } |
3987 | ||
fac6795d | 3988 | /* |
d063d709 | 3989 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3990 | * |
d063d709 | 3991 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3992 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3993 | */ |
be040666 | 3994 | static int set_permissions(char *rundir) |
fac6795d DG |
3995 | { |
3996 | int ret; | |
996b65c8 | 3997 | gid_t gid; |
fac6795d | 3998 | |
996b65c8 MD |
3999 | gid = allowed_group(); |
4000 | if (gid < 0) { | |
be040666 DG |
4001 | WARN("No tracing group detected"); |
4002 | ret = 0; | |
fac6795d DG |
4003 | goto end; |
4004 | } | |
4005 | ||
d6f42150 | 4006 | /* Set lttng run dir */ |
be040666 | 4007 | ret = chown(rundir, 0, gid); |
d6f42150 | 4008 | if (ret < 0) { |
be040666 | 4009 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
4010 | perror("chown"); |
4011 | } | |
4012 | ||
d1613cf5 | 4013 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4014 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4015 | if (ret < 0) { |
4016 | ERR("Unable to set permissions on %s", rundir); | |
4017 | perror("chmod"); | |
4018 | } | |
4019 | ||
d6f42150 | 4020 | /* lttng client socket path */ |
996b65c8 | 4021 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4022 | if (ret < 0) { |
d6f42150 DG |
4023 | ERR("Unable to set group on %s", client_unix_sock_path); |
4024 | perror("chown"); | |
4025 | } | |
4026 | ||
3bd1e081 MD |
4027 | /* kconsumer error socket path */ |
4028 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4029 | if (ret < 0) { |
3bd1e081 MD |
4030 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4031 | perror("chown"); | |
4032 | } | |
4033 | ||
7753dea8 MD |
4034 | /* 64-bit ustconsumer error socket path */ |
4035 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4036 | if (ret < 0) { | |
4037 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4038 | perror("chown"); | |
4039 | } | |
4040 | ||
4041 | /* 32-bit ustconsumer compat32 error socket path */ | |
4042 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4043 | if (ret < 0) { |
7753dea8 | 4044 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4045 | perror("chown"); |
4046 | } | |
4047 | ||
d6f42150 | 4048 | DBG("All permissions are set"); |
e07ae692 | 4049 | |
fac6795d DG |
4050 | end: |
4051 | return ret; | |
4052 | } | |
4053 | ||
7a485870 | 4054 | /* |
d063d709 | 4055 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4056 | */ |
4057 | static int create_kernel_poll_pipe(void) | |
4058 | { | |
730389d9 DG |
4059 | int ret, i; |
4060 | ||
4061 | ret = pipe(kernel_poll_pipe); | |
4062 | if (ret < 0) { | |
4063 | PERROR("kernel poll pipe"); | |
4064 | goto error; | |
4065 | } | |
4066 | ||
4067 | for (i = 0; i < 2; i++) { | |
4068 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4069 | if (ret < 0) { | |
4070 | PERROR("fcntl kernel_poll_pipe"); | |
4071 | goto error; | |
4072 | } | |
4073 | } | |
4074 | ||
4075 | error: | |
4076 | return ret; | |
7a485870 DG |
4077 | } |
4078 | ||
099e26bd DG |
4079 | /* |
4080 | * Create the application command pipe to wake thread_manage_apps. | |
4081 | */ | |
4082 | static int create_apps_cmd_pipe(void) | |
4083 | { | |
730389d9 DG |
4084 | int ret, i; |
4085 | ||
4086 | ret = pipe(apps_cmd_pipe); | |
4087 | if (ret < 0) { | |
4088 | PERROR("apps cmd pipe"); | |
4089 | goto error; | |
4090 | } | |
4091 | ||
4092 | for (i = 0; i < 2; i++) { | |
4093 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4094 | if (ret < 0) { | |
4095 | PERROR("fcntl apps_cmd_pipe"); | |
4096 | goto error; | |
4097 | } | |
4098 | } | |
4099 | ||
4100 | error: | |
4101 | return ret; | |
099e26bd DG |
4102 | } |
4103 | ||
d6f42150 | 4104 | /* |
d063d709 | 4105 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4106 | */ |
67e40797 | 4107 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4108 | { |
4109 | int ret; | |
4110 | ||
67e40797 DG |
4111 | DBG3("Creating LTTng run directory: %s", rundir); |
4112 | ||
d1613cf5 | 4113 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4114 | if (ret < 0) { |
b1f11e69 | 4115 | if (errno != EEXIST) { |
67e40797 | 4116 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4117 | goto error; |
4118 | } else { | |
4119 | ret = 0; | |
4120 | } | |
d6f42150 DG |
4121 | } |
4122 | ||
4123 | error: | |
4124 | return ret; | |
4125 | } | |
4126 | ||
4127 | /* | |
d063d709 DG |
4128 | * Setup sockets and directory needed by the kconsumerd communication with the |
4129 | * session daemon. | |
d6f42150 | 4130 | */ |
67e40797 DG |
4131 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4132 | const char *rundir) | |
d6f42150 DG |
4133 | { |
4134 | int ret; | |
67e40797 | 4135 | char path[PATH_MAX]; |
d6f42150 | 4136 | |
67e40797 | 4137 | switch (consumer_data->type) { |
7753dea8 | 4138 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4139 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4140 | break; |
4141 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4142 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4143 | break; |
4144 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4145 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4146 | break; |
4147 | default: | |
4148 | ERR("Consumer type unknown"); | |
4149 | ret = -EINVAL; | |
4150 | goto error; | |
d6f42150 DG |
4151 | } |
4152 | ||
67e40797 DG |
4153 | DBG2("Creating consumer directory: %s", path); |
4154 | ||
d1613cf5 | 4155 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4156 | if (ret < 0) { |
6beb2242 | 4157 | if (errno != EEXIST) { |
3bd1e081 | 4158 | ERR("Failed to create %s", path); |
6beb2242 DG |
4159 | goto error; |
4160 | } | |
4161 | ret = 0; | |
d6f42150 DG |
4162 | } |
4163 | ||
4164 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4165 | consumer_data->err_sock = |
4166 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4167 | if (consumer_data->err_sock < 0) { | |
4168 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4169 | ret = -1; |
4170 | goto error; | |
4171 | } | |
4172 | ||
4173 | /* File permission MUST be 660 */ | |
3bd1e081 | 4174 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4175 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4176 | if (ret < 0) { |
3bd1e081 | 4177 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4178 | PERROR("chmod"); |
d6f42150 DG |
4179 | goto error; |
4180 | } | |
4181 | ||
4182 | error: | |
4183 | return ret; | |
4184 | } | |
4185 | ||
fac6795d | 4186 | /* |
d063d709 | 4187 | * Signal handler for the daemon |
cf3af59e | 4188 | * |
54d01ffb DG |
4189 | * Simply stop all worker threads, leaving main() return gracefully after |
4190 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4191 | */ |
4192 | static void sighandler(int sig) | |
4193 | { | |
4194 | switch (sig) { | |
cf3af59e | 4195 | case SIGPIPE: |
af87c45a | 4196 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4197 | return; |
4198 | case SIGINT: | |
af87c45a | 4199 | DBG("SIGINT caught"); |
cf3af59e MD |
4200 | stop_threads(); |
4201 | break; | |
4202 | case SIGTERM: | |
af87c45a | 4203 | DBG("SIGTERM caught"); |
cf3af59e MD |
4204 | stop_threads(); |
4205 | break; | |
4206 | default: | |
4207 | break; | |
fac6795d | 4208 | } |
fac6795d DG |
4209 | } |
4210 | ||
4211 | /* | |
d063d709 | 4212 | * Setup signal handler for : |
1d4b027a | 4213 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4214 | */ |
1d4b027a | 4215 | static int set_signal_handler(void) |
fac6795d | 4216 | { |
1d4b027a DG |
4217 | int ret = 0; |
4218 | struct sigaction sa; | |
4219 | sigset_t sigset; | |
fac6795d | 4220 | |
1d4b027a DG |
4221 | if ((ret = sigemptyset(&sigset)) < 0) { |
4222 | perror("sigemptyset"); | |
4223 | return ret; | |
4224 | } | |
d6f42150 | 4225 | |
1d4b027a DG |
4226 | sa.sa_handler = sighandler; |
4227 | sa.sa_mask = sigset; | |
4228 | sa.sa_flags = 0; | |
4229 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4230 | perror("sigaction"); | |
4231 | return ret; | |
d6f42150 DG |
4232 | } |
4233 | ||
1d4b027a DG |
4234 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4235 | perror("sigaction"); | |
4236 | return ret; | |
d6f42150 | 4237 | } |
aaf26714 | 4238 | |
1d4b027a DG |
4239 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4240 | perror("sigaction"); | |
4241 | return ret; | |
8c0faa1d DG |
4242 | } |
4243 | ||
1d4b027a DG |
4244 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4245 | ||
4246 | return ret; | |
fac6795d DG |
4247 | } |
4248 | ||
f3ed775e | 4249 | /* |
d063d709 DG |
4250 | * Set open files limit to unlimited. This daemon can open a large number of |
4251 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4252 | */ |
4253 | static void set_ulimit(void) | |
4254 | { | |
4255 | int ret; | |
4256 | struct rlimit lim; | |
4257 | ||
a88df331 | 4258 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4259 | lim.rlim_cur = 65535; |
4260 | lim.rlim_max = 65535; | |
4261 | ||
4262 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4263 | if (ret < 0) { | |
4264 | perror("failed to set open files limit"); | |
4265 | } | |
4266 | } | |
4267 | ||
fac6795d DG |
4268 | /* |
4269 | * main | |
4270 | */ | |
4271 | int main(int argc, char **argv) | |
4272 | { | |
fac6795d DG |
4273 | int ret = 0; |
4274 | void *status; | |
b082db07 | 4275 | const char *home_path; |
fac6795d | 4276 | |
335a95b7 MD |
4277 | init_kernel_workarounds(); |
4278 | ||
f6a9efaa DG |
4279 | rcu_register_thread(); |
4280 | ||
273ea72c | 4281 | /* Create thread quit pipe */ |
cf3af59e MD |
4282 | if ((ret = init_thread_quit_pipe()) < 0) { |
4283 | goto error; | |
273ea72c DG |
4284 | } |
4285 | ||
7753dea8 | 4286 | setup_consumerd_path(); |
fb09408a | 4287 | |
fac6795d DG |
4288 | /* Parse arguments */ |
4289 | progname = argv[0]; | |
4290 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4291 | goto error; |
fac6795d DG |
4292 | } |
4293 | ||
4294 | /* Daemonize */ | |
4295 | if (opt_daemon) { | |
53094c05 DG |
4296 | ret = daemon(0, 0); |
4297 | if (ret < 0) { | |
4298 | perror("daemon"); | |
cf3af59e | 4299 | goto error; |
53094c05 | 4300 | } |
fac6795d DG |
4301 | } |
4302 | ||
4303 | /* Check if daemon is UID = 0 */ | |
4304 | is_root = !getuid(); | |
4305 | ||
fac6795d | 4306 | if (is_root) { |
990570ed | 4307 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4308 | |
4309 | /* Create global run dir with root access */ | |
4310 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4311 | if (ret < 0) { |
cf3af59e | 4312 | goto error; |
d6f42150 DG |
4313 | } |
4314 | ||
fac6795d | 4315 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4316 | snprintf(apps_unix_sock_path, PATH_MAX, |
4317 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4318 | } |
4319 | ||
4320 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4321 | snprintf(client_unix_sock_path, PATH_MAX, |
4322 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4323 | } | |
0fdd1e2c DG |
4324 | |
4325 | /* Set global SHM for ust */ | |
4326 | if (strlen(wait_shm_path) == 0) { | |
4327 | snprintf(wait_shm_path, PATH_MAX, | |
4328 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4329 | } | |
67e40797 DG |
4330 | |
4331 | /* Setup kernel consumerd path */ | |
4332 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4333 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4334 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4335 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4336 | |
4337 | DBG2("Kernel consumer err path: %s", | |
4338 | kconsumer_data.err_unix_sock_path); | |
4339 | DBG2("Kernel consumer cmd path: %s", | |
4340 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4341 | } else { |
b082db07 DG |
4342 | home_path = get_home_dir(); |
4343 | if (home_path == NULL) { | |
273ea72c DG |
4344 | /* TODO: Add --socket PATH option */ |
4345 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4346 | ret = -EPERM; |
4347 | goto error; | |
b082db07 DG |
4348 | } |
4349 | ||
67e40797 DG |
4350 | /* |
4351 | * Create rundir from home path. This will create something like | |
4352 | * $HOME/.lttng | |
4353 | */ | |
990570ed | 4354 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4355 | if (ret < 0) { |
4356 | ret = -ENOMEM; | |
4357 | goto error; | |
4358 | } | |
4359 | ||
4360 | ret = create_lttng_rundir(rundir); | |
4361 | if (ret < 0) { | |
4362 | goto error; | |
4363 | } | |
4364 | ||
fac6795d | 4365 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4366 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4367 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4368 | } |
4369 | ||
4370 | /* Set the cli tool unix socket path */ | |
4371 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4372 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4373 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4374 | } |
0fdd1e2c DG |
4375 | |
4376 | /* Set global SHM for ust */ | |
4377 | if (strlen(wait_shm_path) == 0) { | |
4378 | snprintf(wait_shm_path, PATH_MAX, | |
4379 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4380 | } | |
fac6795d DG |
4381 | } |
4382 | ||
847177cd DG |
4383 | DBG("Client socket path %s", client_unix_sock_path); |
4384 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4385 | DBG("LTTng run directory path: %s", rundir); |
4386 | ||
4387 | /* 32 bits consumerd path setup */ | |
4388 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4389 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4390 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4391 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4392 | |
4393 | DBG2("UST consumer 32 bits err path: %s", | |
4394 | ustconsumer32_data.err_unix_sock_path); | |
4395 | DBG2("UST consumer 32 bits cmd path: %s", | |
4396 | ustconsumer32_data.cmd_unix_sock_path); | |
4397 | ||
4398 | /* 64 bits consumerd path setup */ | |
4399 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4400 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4401 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4402 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4403 | |
4404 | DBG2("UST consumer 64 bits err path: %s", | |
4405 | ustconsumer64_data.err_unix_sock_path); | |
4406 | DBG2("UST consumer 64 bits cmd path: %s", | |
4407 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4408 | |
273ea72c | 4409 | /* |
7d8234d9 | 4410 | * See if daemon already exist. |
fac6795d | 4411 | */ |
7d8234d9 | 4412 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4413 | ERR("Already running daemon.\n"); |
273ea72c | 4414 | /* |
cf3af59e MD |
4415 | * We do not goto exit because we must not cleanup() |
4416 | * because a daemon is already running. | |
ab118b20 | 4417 | */ |
cf3af59e | 4418 | goto error; |
a88df331 DG |
4419 | } |
4420 | ||
54d01ffb | 4421 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4422 | |
4423 | /* | |
4424 | * These actions must be executed as root. We do that *after* setting up | |
4425 | * the sockets path because we MUST make the check for another daemon using | |
4426 | * those paths *before* trying to set the kernel consumer sockets and init | |
4427 | * kernel tracer. | |
4428 | */ | |
4429 | if (is_root) { | |
67e40797 | 4430 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4431 | if (ret < 0) { |
4432 | goto exit; | |
4433 | } | |
4434 | ||
a88df331 | 4435 | /* Setup kernel tracer */ |
4fba7219 DG |
4436 | if (!opt_no_kernel) { |
4437 | init_kernel_tracer(); | |
4438 | } | |
a88df331 DG |
4439 | |
4440 | /* Set ulimit for open files */ | |
4441 | set_ulimit(); | |
fac6795d DG |
4442 | } |
4443 | ||
67e40797 DG |
4444 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4445 | if (ret < 0) { | |
4446 | goto exit; | |
4447 | } | |
4448 | ||
4449 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4450 | if (ret < 0) { | |
4451 | goto exit; | |
4452 | } | |
4453 | ||
cf3af59e MD |
4454 | if ((ret = set_signal_handler()) < 0) { |
4455 | goto exit; | |
fac6795d DG |
4456 | } |
4457 | ||
d6f42150 | 4458 | /* Setup the needed unix socket */ |
cf3af59e MD |
4459 | if ((ret = init_daemon_socket()) < 0) { |
4460 | goto exit; | |
fac6795d DG |
4461 | } |
4462 | ||
4463 | /* Set credentials to socket */ | |
be040666 | 4464 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4465 | goto exit; |
fac6795d DG |
4466 | } |
4467 | ||
5b8719f5 DG |
4468 | /* Get parent pid if -S, --sig-parent is specified. */ |
4469 | if (opt_sig_parent) { | |
4470 | ppid = getppid(); | |
4471 | } | |
4472 | ||
7a485870 | 4473 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4474 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4475 | goto exit; | |
7a485870 DG |
4476 | } |
4477 | ||
099e26bd DG |
4478 | /* Setup the thread apps communication pipe. */ |
4479 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4480 | goto exit; | |
4481 | } | |
4482 | ||
4483 | /* Init UST command queue. */ | |
4484 | cds_wfq_init(&ust_cmd_queue.queue); | |
4485 | ||
f6a9efaa DG |
4486 | /* Init UST app hash table */ |
4487 | ust_app_ht_alloc(); | |
4488 | ||
273ea72c | 4489 | /* |
54d01ffb DG |
4490 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4491 | * statically declared in session.c | |
273ea72c | 4492 | */ |
54d01ffb | 4493 | session_list_ptr = session_get_list(); |
b5541356 | 4494 | |
5eb91c98 DG |
4495 | /* Set up max poll set size */ |
4496 | lttng_poll_set_max_size(); | |
4497 | ||
cf3af59e | 4498 | /* Create thread to manage the client socket */ |
099e26bd DG |
4499 | ret = pthread_create(&client_thread, NULL, |
4500 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4501 | if (ret != 0) { |
099e26bd | 4502 | perror("pthread_create clients"); |
cf3af59e MD |
4503 | goto exit_client; |
4504 | } | |
fac6795d | 4505 | |
099e26bd DG |
4506 | /* Create thread to dispatch registration */ |
4507 | ret = pthread_create(&dispatch_thread, NULL, | |
4508 | thread_dispatch_ust_registration, (void *) NULL); | |
4509 | if (ret != 0) { | |
4510 | perror("pthread_create dispatch"); | |
4511 | goto exit_dispatch; | |
4512 | } | |
4513 | ||
4514 | /* Create thread to manage application registration. */ | |
4515 | ret = pthread_create(®_apps_thread, NULL, | |
4516 | thread_registration_apps, (void *) NULL); | |
4517 | if (ret != 0) { | |
4518 | perror("pthread_create registration"); | |
4519 | goto exit_reg_apps; | |
4520 | } | |
4521 | ||
cf3af59e | 4522 | /* Create thread to manage application socket */ |
54d01ffb DG |
4523 | ret = pthread_create(&apps_thread, NULL, |
4524 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4525 | if (ret != 0) { |
099e26bd | 4526 | perror("pthread_create apps"); |
cf3af59e MD |
4527 | goto exit_apps; |
4528 | } | |
fac6795d | 4529 | |
cf3af59e | 4530 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4531 | ret = pthread_create(&kernel_thread, NULL, |
4532 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4533 | if (ret != 0) { |
099e26bd | 4534 | perror("pthread_create kernel"); |
cf3af59e MD |
4535 | goto exit_kernel; |
4536 | } | |
7a485870 | 4537 | |
cf3af59e MD |
4538 | ret = pthread_join(kernel_thread, &status); |
4539 | if (ret != 0) { | |
4540 | perror("pthread_join"); | |
4541 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4542 | } |
4543 | ||
cf3af59e MD |
4544 | exit_kernel: |
4545 | ret = pthread_join(apps_thread, &status); | |
4546 | if (ret != 0) { | |
4547 | perror("pthread_join"); | |
4548 | goto error; /* join error, exit without cleanup */ | |
4549 | } | |
fac6795d | 4550 | |
cf3af59e | 4551 | exit_apps: |
099e26bd DG |
4552 | ret = pthread_join(reg_apps_thread, &status); |
4553 | if (ret != 0) { | |
4554 | perror("pthread_join"); | |
4555 | goto error; /* join error, exit without cleanup */ | |
4556 | } | |
4557 | ||
4558 | exit_reg_apps: | |
4559 | ret = pthread_join(dispatch_thread, &status); | |
4560 | if (ret != 0) { | |
4561 | perror("pthread_join"); | |
4562 | goto error; /* join error, exit without cleanup */ | |
4563 | } | |
4564 | ||
4565 | exit_dispatch: | |
cf3af59e MD |
4566 | ret = pthread_join(client_thread, &status); |
4567 | if (ret != 0) { | |
4568 | perror("pthread_join"); | |
4569 | goto error; /* join error, exit without cleanup */ | |
4570 | } | |
4571 | ||
3bd1e081 | 4572 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4573 | if (ret != 0) { |
3bd1e081 | 4574 | perror("join_consumer"); |
cf3af59e MD |
4575 | goto error; /* join error, exit without cleanup */ |
4576 | } | |
a88df331 | 4577 | |
cf3af59e | 4578 | exit_client: |
a88df331 | 4579 | exit: |
cf3af59e MD |
4580 | /* |
4581 | * cleanup() is called when no other thread is running. | |
4582 | */ | |
f6a9efaa | 4583 | rcu_thread_online(); |
cf3af59e | 4584 | cleanup(); |
f6a9efaa DG |
4585 | rcu_thread_offline(); |
4586 | rcu_unregister_thread(); | |
67e40797 | 4587 | if (!ret) { |
cf3af59e | 4588 | exit(EXIT_SUCCESS); |
67e40797 | 4589 | } |
cf3af59e | 4590 | error: |
5e16da05 | 4591 | exit(EXIT_FAILURE); |
fac6795d | 4592 | } |