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 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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> | |
f22d70f0 | 37 | #include <urcu/uatomic.h> |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
990570ed | 41 | #include <common/common.h> |
0ba98ebc | 42 | #include <common/compat/poll.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
db758600 DG |
44 | #include <common/defaults.h> |
45 | #include <common/kernel-consumer/kernel-consumer.h> | |
46 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
099e26bd | 50 | #include "context.h" |
54d01ffb | 51 | #include "event.h" |
099e26bd | 52 | #include "futex.h" |
4771f025 | 53 | #include "kernel.h" |
096102bd | 54 | #include "modprobe.h" |
0fdd1e2c | 55 | #include "shm.h" |
1e307fab | 56 | #include "ust-ctl.h" |
8e68d1c8 | 57 | #include "utils.h" |
4063050c | 58 | #include "fd-limit.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
3bd1e081 MD |
62 | struct consumer_data { |
63 | enum lttng_consumer_type type; | |
64 | ||
65 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
66 | sem_t sem; | |
67 | ||
68 | /* Mutex to control consumerd pid assignation */ | |
69 | pthread_mutex_t pid_mutex; | |
70 | pid_t pid; | |
71 | ||
72 | int err_sock; | |
73 | int cmd_sock; | |
74 | ||
75 | /* consumer error and command Unix socket path */ | |
76 | char err_unix_sock_path[PATH_MAX]; | |
77 | char cmd_unix_sock_path[PATH_MAX]; | |
78 | }; | |
79 | ||
75462a81 | 80 | /* Const values */ |
686204ab | 81 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 82 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
83 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
84 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
85 | ||
fac6795d DG |
86 | const char *progname; |
87 | const char *opt_tracing_group; | |
5b8719f5 | 88 | static int opt_sig_parent; |
97e19046 | 89 | static int opt_verbose_consumer; |
fac6795d | 90 | static int opt_daemon; |
4fba7219 | 91 | static int opt_no_kernel; |
fac6795d | 92 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 93 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 94 | static char *rundir; |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
99 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
100 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
101 | .err_sock = -1, |
102 | .cmd_sock = -1, | |
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, | |
03550b58 MD |
108 | .err_sock = -1, |
109 | .cmd_sock = -1, | |
7753dea8 MD |
110 | }; |
111 | static struct consumer_data ustconsumer32_data = { | |
112 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
113 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
114 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
115 | .err_sock = -1, |
116 | .cmd_sock = -1, | |
3bd1e081 MD |
117 | }; |
118 | ||
099e26bd | 119 | static int dispatch_thread_exit; |
fac6795d | 120 | |
54d01ffb DG |
121 | /* Global application Unix socket path */ |
122 | static char apps_unix_sock_path[PATH_MAX]; | |
123 | /* Global client Unix socket path */ | |
124 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
125 | /* global wait shm path for UST */ |
126 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 127 | |
1d4b027a | 128 | /* Sockets and FDs */ |
a4b35e07 MD |
129 | static int client_sock = -1; |
130 | static int apps_sock = -1; | |
131 | static int kernel_tracer_fd = -1; | |
76d7553f | 132 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 133 | |
273ea72c DG |
134 | /* |
135 | * Quit pipe for all threads. This permits a single cancellation point | |
136 | * for all threads when receiving an event on the pipe. | |
137 | */ | |
76d7553f | 138 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 139 | |
099e26bd DG |
140 | /* |
141 | * This pipe is used to inform the thread managing application communication | |
142 | * that a command is queued and ready to be processed. | |
143 | */ | |
76d7553f | 144 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 145 | |
1d4b027a | 146 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 147 | static pthread_t apps_thread; |
099e26bd | 148 | static pthread_t reg_apps_thread; |
1d4b027a | 149 | static pthread_t client_thread; |
7a485870 | 150 | static pthread_t kernel_thread; |
099e26bd | 151 | static pthread_t dispatch_thread; |
5eb91c98 | 152 | |
fac6795d | 153 | |
099e26bd DG |
154 | /* |
155 | * UST registration command queue. This queue is tied with a futex and uses a N | |
156 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
157 | * | |
158 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
159 | * this queue and the wait/wake scheme. | |
160 | */ | |
161 | static struct ust_cmd_queue ust_cmd_queue; | |
162 | ||
b5541356 DG |
163 | /* |
164 | * Pointer initialized before thread creation. | |
165 | * | |
166 | * This points to the tracing session list containing the session count and a | |
167 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
168 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 169 | * |
d063d709 | 170 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 171 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
172 | */ |
173 | static struct ltt_session_list *session_list_ptr; | |
174 | ||
7753dea8 MD |
175 | int ust_consumerd64_fd = -1; |
176 | int ust_consumerd32_fd = -1; | |
177 | ||
fb6f1fa2 YB |
178 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
179 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
180 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
181 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 182 | |
f22d70f0 DG |
183 | /* |
184 | * Consumer daemon state which is changed when spawning it, killing it or in | |
185 | * case of a fatal error. | |
186 | */ | |
187 | enum consumerd_state { | |
188 | CONSUMER_STARTED = 1, | |
189 | CONSUMER_STOPPED = 2, | |
190 | CONSUMER_ERROR = 3, | |
191 | }; | |
192 | ||
193 | /* | |
194 | * This consumer daemon state is used to validate if a client command will be | |
195 | * able to reach the consumer. If not, the client is informed. For instance, | |
196 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
197 | * error to the client. | |
198 | * | |
199 | * The following example shows a possible race condition of this scheme: | |
200 | * | |
201 | * consumer thread error happens | |
202 | * client cmd arrives | |
203 | * client cmd checks state -> still OK | |
204 | * consumer thread exit, sets error | |
205 | * client cmd try to talk to consumer | |
206 | * ... | |
207 | * | |
208 | * However, since the consumer is a different daemon, we have no way of making | |
209 | * sure the command will reach it safely even with this state flag. This is why | |
210 | * we consider that up to the state validation during command processing, the | |
211 | * command is safe. After that, we can not guarantee the correctness of the | |
212 | * client request vis-a-vis the consumer. | |
213 | */ | |
214 | static enum consumerd_state ust_consumerd_state; | |
215 | static enum consumerd_state kernel_consumerd_state; | |
216 | ||
fb09408a | 217 | static |
7753dea8 | 218 | void setup_consumerd_path(void) |
fb09408a | 219 | { |
fc7a59ce | 220 | const char *bin, *libdir; |
fb09408a | 221 | |
7753dea8 MD |
222 | /* |
223 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
224 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
225 | * has not been defined. | |
7753dea8 | 226 | */ |
ebaeda94 | 227 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
228 | if (!consumerd32_bin[0]) { |
229 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
230 | } |
231 | if (!consumerd32_libdir[0]) { | |
232 | consumerd32_libdir = INSTALL_LIB_PATH; | |
233 | } | |
234 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
235 | if (!consumerd64_bin[0]) { |
236 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 237 | } |
ebaeda94 MD |
238 | if (!consumerd64_libdir[0]) { |
239 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
240 | } |
241 | #else | |
242 | #error "Unknown bitness" | |
243 | #endif | |
244 | ||
fb09408a MD |
245 | /* |
246 | * runtime env. var. overrides the build default. | |
247 | */ | |
fc7a59ce AM |
248 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
249 | if (bin) { | |
250 | consumerd32_bin = bin; | |
7753dea8 | 251 | } |
fc7a59ce AM |
252 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
253 | if (bin) { | |
254 | consumerd64_bin = bin; | |
ebaeda94 | 255 | } |
72f579ee | 256 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
257 | if (libdir) { |
258 | consumerd32_libdir = libdir; | |
259 | } | |
72f579ee | 260 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
261 | if (libdir) { |
262 | consumerd64_libdir = libdir; | |
fb09408a MD |
263 | } |
264 | } | |
265 | ||
5eb91c98 DG |
266 | /* |
267 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
268 | */ | |
269 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
270 | unsigned int size) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | if (events == NULL || size == 0) { | |
275 | ret = -1; | |
276 | goto error; | |
277 | } | |
278 | ||
279 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
280 | if (ret < 0) { | |
281 | goto error; | |
282 | } | |
283 | ||
284 | /* Add quit pipe */ | |
285 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
286 | if (ret < 0) { | |
287 | goto error; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | ||
292 | error: | |
293 | return ret; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Check if the thread quit pipe was triggered. | |
298 | * | |
299 | * Return 1 if it was triggered else 0; | |
300 | */ | |
301 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
302 | { | |
303 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
304 | return 1; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
0fdd1e2c DG |
310 | /* |
311 | * Return group ID of the tracing group or -1 if not found. | |
312 | */ | |
996b65c8 MD |
313 | static gid_t allowed_group(void) |
314 | { | |
315 | struct group *grp; | |
316 | ||
274e143b MD |
317 | if (opt_tracing_group) { |
318 | grp = getgrnam(opt_tracing_group); | |
319 | } else { | |
320 | grp = getgrnam(default_tracing_group); | |
321 | } | |
996b65c8 MD |
322 | if (!grp) { |
323 | return -1; | |
324 | } else { | |
325 | return grp->gr_gid; | |
326 | } | |
327 | } | |
328 | ||
273ea72c | 329 | /* |
5eb91c98 | 330 | * Init thread quit pipe. |
273ea72c DG |
331 | * |
332 | * Return -1 on error or 0 if all pipes are created. | |
333 | */ | |
334 | static int init_thread_quit_pipe(void) | |
335 | { | |
730389d9 | 336 | int ret, i; |
273ea72c | 337 | |
730389d9 | 338 | ret = pipe(thread_quit_pipe); |
273ea72c | 339 | if (ret < 0) { |
730389d9 | 340 | PERROR("thread quit pipe"); |
273ea72c DG |
341 | goto error; |
342 | } | |
343 | ||
730389d9 DG |
344 | for (i = 0; i < 2; i++) { |
345 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
346 | if (ret < 0) { | |
347 | PERROR("fcntl"); | |
348 | goto error; | |
349 | } | |
350 | } | |
351 | ||
273ea72c DG |
352 | error: |
353 | return ret; | |
354 | } | |
355 | ||
fac6795d | 356 | /* |
d063d709 DG |
357 | * Complete teardown of a kernel session. This free all data structure related |
358 | * to a kernel session and update counter. | |
fac6795d | 359 | */ |
1d4b027a | 360 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 361 | { |
8f7a84dd | 362 | if (!session->kernel_session) { |
99bab54f | 363 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 364 | return; |
8f7a84dd DG |
365 | } |
366 | ||
84ea9c99 | 367 | DBG("Tearing down kernel session"); |
d9800920 | 368 | |
84ea9c99 MD |
369 | /* |
370 | * If a custom kernel consumer was registered, close the socket before | |
371 | * tearing down the complete kernel session structure | |
372 | */ | |
03550b58 MD |
373 | if (kconsumer_data.cmd_sock >= 0 && |
374 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 375 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 376 | } |
84ea9c99 MD |
377 | |
378 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
379 | } |
380 | ||
f6a9efaa DG |
381 | /* |
382 | * Complete teardown of all UST sessions. This will free everything on his path | |
383 | * and destroy the core essence of all ust sessions :) | |
384 | */ | |
385 | static void teardown_ust_session(struct ltt_session *session) | |
386 | { | |
84cd17c6 MD |
387 | int ret; |
388 | ||
8f7a84dd | 389 | if (!session->ust_session) { |
99bab54f | 390 | DBG3("No UST session when tearing down session"); |
f470a390 | 391 | return; |
8f7a84dd DG |
392 | } |
393 | ||
84ea9c99 | 394 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 395 | |
84cd17c6 MD |
396 | ret = ust_app_destroy_trace_all(session->ust_session); |
397 | if (ret) { | |
398 | ERR("Error in ust_app_destroy_trace_all"); | |
399 | } | |
8f7a84dd | 400 | |
f6a9efaa DG |
401 | trace_ust_destroy_session(session->ust_session); |
402 | } | |
403 | ||
099e26bd DG |
404 | /* |
405 | * Stop all threads by closing the thread quit pipe. | |
406 | */ | |
cf3af59e MD |
407 | static void stop_threads(void) |
408 | { | |
5eb91c98 DG |
409 | int ret; |
410 | ||
cf3af59e MD |
411 | /* Stopping all threads */ |
412 | DBG("Terminating all threads"); | |
54d01ffb | 413 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
414 | if (ret < 0) { |
415 | ERR("write error on thread quit pipe"); | |
416 | } | |
417 | ||
099e26bd DG |
418 | /* Dispatch thread */ |
419 | dispatch_thread_exit = 1; | |
420 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
421 | } |
422 | ||
fac6795d | 423 | /* |
d063d709 | 424 | * Cleanup the daemon |
fac6795d | 425 | */ |
cf3af59e | 426 | static void cleanup(void) |
fac6795d | 427 | { |
76d7553f | 428 | int ret, i; |
1d4b027a | 429 | char *cmd; |
af9737e9 | 430 | struct ltt_session *sess, *stmp; |
fac6795d | 431 | |
1d4b027a | 432 | DBG("Cleaning up"); |
e07ae692 | 433 | |
67e40797 DG |
434 | DBG("Removing %s directory", rundir); |
435 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
436 | if (ret < 0) { | |
437 | ERR("asprintf failed. Something is really wrong!"); | |
438 | } | |
5461b305 | 439 | |
67e40797 DG |
440 | /* Remove lttng run directory */ |
441 | ret = system(cmd); | |
442 | if (ret < 0) { | |
443 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 444 | } |
67e40797 | 445 | free(cmd); |
5461b305 | 446 | |
99bab54f | 447 | DBG("Cleaning up all sessions"); |
fac6795d | 448 | |
b5541356 | 449 | /* Destroy session list mutex */ |
273ea72c DG |
450 | if (session_list_ptr != NULL) { |
451 | pthread_mutex_destroy(&session_list_ptr->lock); | |
452 | ||
453 | /* Cleanup ALL session */ | |
54d01ffb DG |
454 | cds_list_for_each_entry_safe(sess, stmp, |
455 | &session_list_ptr->head, list) { | |
273ea72c | 456 | teardown_kernel_session(sess); |
f6a9efaa DG |
457 | teardown_ust_session(sess); |
458 | free(sess); | |
273ea72c DG |
459 | } |
460 | } | |
461 | ||
099e26bd | 462 | DBG("Closing all UST sockets"); |
56fff090 | 463 | ust_app_clean_list(); |
099e26bd | 464 | |
3bd1e081 | 465 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 466 | |
4fba7219 DG |
467 | if (is_root && !opt_no_kernel) { |
468 | DBG2("Closing kernel fd"); | |
a4b35e07 | 469 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
470 | ret = close(kernel_tracer_fd); |
471 | if (ret) { | |
472 | PERROR("close"); | |
473 | } | |
a4b35e07 | 474 | } |
2f50c8a3 | 475 | DBG("Unloading kernel modules"); |
096102bd | 476 | modprobe_remove_lttng_all(); |
2f50c8a3 | 477 | } |
5eb91c98 | 478 | |
76d7553f MD |
479 | /* |
480 | * Closing all pipes used for communication between threads. | |
481 | */ | |
482 | for (i = 0; i < 2; i++) { | |
483 | if (kernel_poll_pipe[i] >= 0) { | |
484 | ret = close(kernel_poll_pipe[i]); | |
485 | if (ret) { | |
486 | PERROR("close"); | |
487 | } | |
76d7553f MD |
488 | } |
489 | } | |
490 | for (i = 0; i < 2; i++) { | |
491 | if (thread_quit_pipe[i] >= 0) { | |
492 | ret = close(thread_quit_pipe[i]); | |
493 | if (ret) { | |
494 | PERROR("close"); | |
495 | } | |
496 | } | |
497 | } | |
498 | for (i = 0; i < 2; i++) { | |
499 | if (apps_cmd_pipe[i] >= 0) { | |
500 | ret = close(apps_cmd_pipe[i]); | |
501 | if (ret) { | |
502 | PERROR("close"); | |
503 | } | |
504 | } | |
505 | } | |
421cb601 DG |
506 | |
507 | /* <fun> */ | |
f56a39af | 508 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
509 | "Matthew, BEET driven development works!%c[%dm", |
510 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
511 | /* </fun> */ | |
fac6795d DG |
512 | } |
513 | ||
e065084a | 514 | /* |
d063d709 | 515 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 516 | * |
d063d709 | 517 | * Return lttcomm error code. |
e065084a DG |
518 | */ |
519 | static int send_unix_sock(int sock, void *buf, size_t len) | |
520 | { | |
521 | /* Check valid length */ | |
522 | if (len <= 0) { | |
523 | return -1; | |
524 | } | |
525 | ||
526 | return lttcomm_send_unix_sock(sock, buf, len); | |
527 | } | |
528 | ||
5461b305 | 529 | /* |
d063d709 | 530 | * Free memory of a command context structure. |
5461b305 | 531 | */ |
a2fb29a5 | 532 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 533 | { |
a2fb29a5 DG |
534 | DBG("Clean command context structure"); |
535 | if (*cmd_ctx) { | |
536 | if ((*cmd_ctx)->llm) { | |
537 | free((*cmd_ctx)->llm); | |
5461b305 | 538 | } |
a2fb29a5 DG |
539 | if ((*cmd_ctx)->lsm) { |
540 | free((*cmd_ctx)->lsm); | |
5461b305 | 541 | } |
a2fb29a5 DG |
542 | free(*cmd_ctx); |
543 | *cmd_ctx = NULL; | |
5461b305 DG |
544 | } |
545 | } | |
546 | ||
f3ed775e | 547 | /* |
d063d709 | 548 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 549 | */ |
2bdd86d4 | 550 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
551 | int sock, struct ltt_kernel_channel *channel, |
552 | uid_t uid, gid_t gid) | |
f3ed775e DG |
553 | { |
554 | int ret; | |
f3ed775e | 555 | struct ltt_kernel_stream *stream; |
3bd1e081 | 556 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 557 | |
3bd1e081 | 558 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 559 | channel->channel->name); |
f3ed775e | 560 | |
3bd1e081 MD |
561 | /* Send channel */ |
562 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
563 | lkm.u.channel.channel_key = channel->fd; | |
564 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
565 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 566 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 567 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 568 | if (ret < 0) { |
76d7553f | 569 | PERROR("send consumer channel"); |
f3ed775e DG |
570 | goto error; |
571 | } | |
572 | ||
3bd1e081 | 573 | /* Send streams */ |
7a485870 | 574 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
575 | if (!stream->fd) { |
576 | continue; | |
577 | } | |
578 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
579 | lkm.u.stream.channel_key = channel->fd; | |
580 | lkm.u.stream.stream_key = stream->fd; | |
581 | lkm.u.stream.state = stream->state; | |
582 | lkm.u.stream.output = channel->channel->attr.output; | |
583 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
584 | lkm.u.stream.uid = uid; |
585 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
586 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
587 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
588 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
589 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
590 | if (ret < 0) { | |
76d7553f | 591 | PERROR("send consumer stream"); |
3bd1e081 MD |
592 | goto error; |
593 | } | |
594 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
595 | if (ret < 0) { | |
76d7553f | 596 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 597 | goto error; |
f3ed775e DG |
598 | } |
599 | } | |
600 | ||
3bd1e081 | 601 | DBG("consumer channel streams sent"); |
f3ed775e DG |
602 | |
603 | return 0; | |
604 | ||
605 | error: | |
606 | return ret; | |
607 | } | |
608 | ||
609 | /* | |
d063d709 | 610 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 611 | */ |
2bdd86d4 | 612 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 613 | struct ltt_kernel_session *session) |
f3ed775e DG |
614 | { |
615 | int ret; | |
616 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
617 | struct lttcomm_consumer_msg lkm; |
618 | int sock = session->consumer_fd; | |
7a485870 DG |
619 | |
620 | DBG("Sending metadata stream fd"); | |
621 | ||
03550b58 MD |
622 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
623 | if (session->consumer_fd < 0) { | |
3bd1e081 | 624 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
625 | } |
626 | ||
03550b58 | 627 | if (session->metadata_stream_fd >= 0) { |
3bd1e081 MD |
628 | /* Send metadata channel fd */ |
629 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
630 | lkm.u.channel.channel_key = session->metadata->fd; | |
631 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
632 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
032b44f0 | 633 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 MD |
634 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
635 | if (ret < 0) { | |
76d7553f | 636 | PERROR("send consumer channel"); |
3bd1e081 MD |
637 | goto error; |
638 | } | |
639 | ||
640 | /* Send metadata stream fd */ | |
641 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
642 | lkm.u.stream.channel_key = session->metadata->fd; | |
643 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
644 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
645 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
646 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
647 | lkm.u.stream.uid = session->uid; |
648 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
649 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
650 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
651 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
652 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
653 | if (ret < 0) { | |
76d7553f | 654 | PERROR("send consumer stream"); |
3bd1e081 MD |
655 | goto error; |
656 | } | |
657 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 658 | if (ret < 0) { |
76d7553f | 659 | PERROR("send consumer stream"); |
7a485870 DG |
660 | goto error; |
661 | } | |
662 | } | |
f3ed775e | 663 | |
f3ed775e | 664 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
665 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
666 | session->uid, session->gid); | |
2bdd86d4 MD |
667 | if (ret < 0) { |
668 | goto error; | |
669 | } | |
670 | } | |
671 | ||
672 | DBG("consumer fds (metadata and channel streams) sent"); | |
673 | ||
674 | return 0; | |
675 | ||
676 | error: | |
677 | return ret; | |
678 | } | |
679 | ||
fac6795d | 680 | /* |
0fdd1e2c | 681 | * Notify UST applications using the shm mmap futex. |
fac6795d | 682 | */ |
0fdd1e2c | 683 | static int notify_ust_apps(int active) |
fac6795d | 684 | { |
0fdd1e2c | 685 | char *wait_shm_mmap; |
fac6795d | 686 | |
0fdd1e2c | 687 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 688 | |
0fdd1e2c DG |
689 | /* See shm.c for this call implying mmap, shm and futex calls */ |
690 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
691 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
692 | goto error; |
693 | } | |
694 | ||
0fdd1e2c DG |
695 | /* Wake waiting process */ |
696 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
697 | ||
698 | /* Apps notified successfully */ | |
699 | return 0; | |
fac6795d DG |
700 | |
701 | error: | |
0fdd1e2c | 702 | return -1; |
fac6795d DG |
703 | } |
704 | ||
e065084a | 705 | /* |
d063d709 DG |
706 | * Setup the outgoing data buffer for the response (llm) by allocating the |
707 | * right amount of memory and copying the original information from the lsm | |
708 | * structure. | |
ca95a216 | 709 | * |
d063d709 | 710 | * Return total size of the buffer pointed by buf. |
ca95a216 | 711 | */ |
5461b305 | 712 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 713 | { |
f3ed775e | 714 | int ret, buf_size; |
ca95a216 | 715 | |
f3ed775e | 716 | buf_size = size; |
5461b305 | 717 | |
ba7f0ae5 | 718 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 719 | if (cmd_ctx->llm == NULL) { |
76d7553f | 720 | PERROR("zmalloc"); |
5461b305 | 721 | ret = -ENOMEM; |
ca95a216 DG |
722 | goto error; |
723 | } | |
724 | ||
5461b305 DG |
725 | /* Copy common data */ |
726 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 727 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 728 | |
5461b305 DG |
729 | cmd_ctx->llm->data_size = size; |
730 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
731 | ||
ca95a216 DG |
732 | return buf_size; |
733 | ||
734 | error: | |
735 | return ret; | |
736 | } | |
737 | ||
7a485870 | 738 | /* |
5eb91c98 | 739 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 740 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 741 | */ |
5eb91c98 | 742 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 743 | { |
5eb91c98 | 744 | int ret; |
7a485870 DG |
745 | struct ltt_session *session; |
746 | struct ltt_kernel_channel *channel; | |
747 | ||
5eb91c98 | 748 | DBG("Updating kernel poll set"); |
7a485870 | 749 | |
54d01ffb | 750 | session_lock_list(); |
b5541356 | 751 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 752 | session_lock(session); |
7a485870 | 753 | if (session->kernel_session == NULL) { |
54d01ffb | 754 | session_unlock(session); |
7a485870 DG |
755 | continue; |
756 | } | |
7a485870 | 757 | |
54d01ffb DG |
758 | cds_list_for_each_entry(channel, |
759 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
760 | /* Add channel fd to the kernel poll set */ |
761 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
762 | if (ret < 0) { | |
54d01ffb | 763 | session_unlock(session); |
5eb91c98 DG |
764 | goto error; |
765 | } | |
766 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 767 | } |
54d01ffb | 768 | session_unlock(session); |
7a485870 | 769 | } |
54d01ffb | 770 | session_unlock_list(); |
7a485870 | 771 | |
5eb91c98 | 772 | return 0; |
7a485870 DG |
773 | |
774 | error: | |
54d01ffb | 775 | session_unlock_list(); |
7a485870 DG |
776 | return -1; |
777 | } | |
778 | ||
779 | /* | |
54d01ffb | 780 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 781 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 782 | * |
d063d709 | 783 | * Useful for CPU hotplug feature. |
7a485870 | 784 | */ |
2bdd86d4 | 785 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
786 | { |
787 | int ret = 0; | |
788 | struct ltt_session *session; | |
789 | struct ltt_kernel_channel *channel; | |
790 | ||
791 | DBG("Updating kernel streams for channel fd %d", fd); | |
792 | ||
54d01ffb | 793 | session_lock_list(); |
b5541356 | 794 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 795 | session_lock(session); |
7a485870 | 796 | if (session->kernel_session == NULL) { |
54d01ffb | 797 | session_unlock(session); |
7a485870 DG |
798 | continue; |
799 | } | |
d9800920 | 800 | |
03550b58 MD |
801 | /* This is not suppose to be -1 but this is an extra security check */ |
802 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 803 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
804 | } |
805 | ||
5eb91c98 DG |
806 | cds_list_for_each_entry(channel, |
807 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
808 | if (channel->fd == fd) { |
809 | DBG("Channel found, updating kernel streams"); | |
810 | ret = kernel_open_channel_stream(channel); | |
811 | if (ret < 0) { | |
b3c750d2 | 812 | goto error; |
7a485870 | 813 | } |
d9800920 | 814 | |
7a485870 | 815 | /* |
5eb91c98 DG |
816 | * Have we already sent fds to the consumer? If yes, it means |
817 | * that tracing is started so it is safe to send our updated | |
818 | * stream fds. | |
7a485870 | 819 | */ |
3bd1e081 | 820 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 821 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
822 | session->kernel_session->consumer_fd, channel, |
823 | session->uid, session->gid); | |
7a485870 | 824 | if (ret < 0) { |
b3c750d2 | 825 | goto error; |
7a485870 DG |
826 | } |
827 | } | |
b3c750d2 | 828 | goto error; |
7a485870 DG |
829 | } |
830 | } | |
54d01ffb | 831 | session_unlock(session); |
7a485870 | 832 | } |
54d01ffb | 833 | session_unlock_list(); |
b3c750d2 | 834 | return ret; |
7a485870 | 835 | |
b3c750d2 | 836 | error: |
54d01ffb DG |
837 | session_unlock(session); |
838 | session_unlock_list(); | |
7a485870 DG |
839 | return ret; |
840 | } | |
841 | ||
487cf67c DG |
842 | /* |
843 | * For each tracing session, update newly registered apps. | |
844 | */ | |
845 | static void update_ust_app(int app_sock) | |
846 | { | |
847 | struct ltt_session *sess, *stmp; | |
848 | ||
4ee14516 DG |
849 | session_lock_list(); |
850 | ||
487cf67c DG |
851 | /* For all tracing session(s) */ |
852 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 853 | session_lock(sess); |
421cb601 DG |
854 | if (sess->ust_session) { |
855 | ust_app_global_update(sess->ust_session, app_sock); | |
856 | } | |
4ee14516 | 857 | session_unlock(sess); |
487cf67c | 858 | } |
4ee14516 DG |
859 | |
860 | session_unlock_list(); | |
487cf67c DG |
861 | } |
862 | ||
7a485870 | 863 | /* |
d063d709 | 864 | * This thread manage event coming from the kernel. |
7a485870 | 865 | * |
d063d709 DG |
866 | * Features supported in this thread: |
867 | * -) CPU Hotplug | |
7a485870 DG |
868 | */ |
869 | static void *thread_manage_kernel(void *data) | |
870 | { | |
5eb91c98 DG |
871 | int ret, i, pollfd, update_poll_flag = 1; |
872 | uint32_t revents, nb_fd; | |
7a485870 | 873 | char tmp; |
5eb91c98 | 874 | struct lttng_poll_event events; |
7a485870 DG |
875 | |
876 | DBG("Thread manage kernel started"); | |
877 | ||
5eb91c98 DG |
878 | ret = create_thread_poll_set(&events, 2); |
879 | if (ret < 0) { | |
76d7553f | 880 | goto error_poll_create; |
5eb91c98 DG |
881 | } |
882 | ||
883 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
884 | if (ret < 0) { | |
885 | goto error; | |
886 | } | |
887 | ||
7a485870 DG |
888 | while (1) { |
889 | if (update_poll_flag == 1) { | |
5f822d0a DG |
890 | /* |
891 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
892 | * quit pipe and the kernel pipe. | |
893 | */ | |
894 | events.nb_fd = 2; | |
895 | ||
5eb91c98 DG |
896 | ret = update_kernel_poll(&events); |
897 | if (ret < 0) { | |
7a485870 DG |
898 | goto error; |
899 | } | |
900 | update_poll_flag = 0; | |
901 | } | |
902 | ||
5eb91c98 DG |
903 | nb_fd = LTTNG_POLL_GETNB(&events); |
904 | ||
905 | DBG("Thread kernel polling on %d fds", nb_fd); | |
906 | ||
907 | /* Zeroed the poll events */ | |
908 | lttng_poll_reset(&events); | |
7a485870 DG |
909 | |
910 | /* Poll infinite value of time */ | |
88f2b785 | 911 | restart: |
5eb91c98 | 912 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 913 | if (ret < 0) { |
88f2b785 MD |
914 | /* |
915 | * Restart interrupted system call. | |
916 | */ | |
917 | if (errno == EINTR) { | |
918 | goto restart; | |
919 | } | |
7a485870 DG |
920 | goto error; |
921 | } else if (ret == 0) { | |
922 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
923 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
924 | "This should not have happened! Continuing..."); | |
7a485870 DG |
925 | continue; |
926 | } | |
927 | ||
5eb91c98 DG |
928 | for (i = 0; i < nb_fd; i++) { |
929 | /* Fetch once the poll data */ | |
930 | revents = LTTNG_POLL_GETEV(&events, i); | |
931 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 932 | |
5eb91c98 DG |
933 | /* Thread quit pipe has been closed. Killing thread. */ |
934 | ret = check_thread_quit_pipe(pollfd, revents); | |
935 | if (ret) { | |
936 | goto error; | |
937 | } | |
7a485870 | 938 | |
5eb91c98 DG |
939 | /* Check for data on kernel pipe */ |
940 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
941 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
942 | update_poll_flag = 1; | |
943 | continue; | |
944 | } else { | |
945 | /* | |
946 | * New CPU detected by the kernel. Adding kernel stream to | |
947 | * kernel session and updating the kernel consumer | |
948 | */ | |
949 | if (revents & LPOLLIN) { | |
2bdd86d4 | 950 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
951 | if (ret < 0) { |
952 | continue; | |
953 | } | |
954 | break; | |
955 | /* | |
956 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
957 | * and unregister kernel stream at this point. | |
958 | */ | |
7a485870 | 959 | } |
7a485870 DG |
960 | } |
961 | } | |
962 | } | |
963 | ||
964 | error: | |
5eb91c98 | 965 | lttng_poll_clean(&events); |
76d7553f MD |
966 | error_poll_create: |
967 | DBG("Kernel thread dying"); | |
7a485870 DG |
968 | return NULL; |
969 | } | |
970 | ||
1d4b027a | 971 | /* |
3bd1e081 | 972 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 973 | */ |
3bd1e081 | 974 | static void *thread_manage_consumer(void *data) |
1d4b027a | 975 | { |
76d7553f | 976 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 977 | uint32_t revents, nb_fd; |
1d4b027a | 978 | enum lttcomm_return_code code; |
5eb91c98 | 979 | struct lttng_poll_event events; |
3bd1e081 | 980 | struct consumer_data *consumer_data = data; |
1d4b027a | 981 | |
3bd1e081 | 982 | DBG("[thread] Manage consumer started"); |
1d4b027a | 983 | |
3bd1e081 | 984 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 985 | if (ret < 0) { |
76d7553f | 986 | goto error_listen; |
1d4b027a DG |
987 | } |
988 | ||
5eb91c98 DG |
989 | /* |
990 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
991 | * Nothing more will be added to this poll set. | |
992 | */ | |
993 | ret = create_thread_poll_set(&events, 2); | |
994 | if (ret < 0) { | |
76d7553f | 995 | goto error_poll; |
5eb91c98 | 996 | } |
273ea72c | 997 | |
3bd1e081 | 998 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
999 | if (ret < 0) { |
1000 | goto error; | |
1001 | } | |
1002 | ||
1003 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
1004 | |
1005 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1006 | restart: |
5eb91c98 | 1007 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1008 | if (ret < 0) { |
88f2b785 MD |
1009 | /* |
1010 | * Restart interrupted system call. | |
1011 | */ | |
1012 | if (errno == EINTR) { | |
1013 | goto restart; | |
1014 | } | |
273ea72c DG |
1015 | goto error; |
1016 | } | |
1017 | ||
5eb91c98 DG |
1018 | for (i = 0; i < nb_fd; i++) { |
1019 | /* Fetch once the poll data */ | |
1020 | revents = LTTNG_POLL_GETEV(&events, i); | |
1021 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1022 | ||
1023 | /* Thread quit pipe has been closed. Killing thread. */ | |
1024 | ret = check_thread_quit_pipe(pollfd, revents); | |
1025 | if (ret) { | |
1026 | goto error; | |
1027 | } | |
1028 | ||
1029 | /* Event on the registration socket */ | |
3bd1e081 | 1030 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1031 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1032 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1033 | goto error; |
1034 | } | |
1035 | } | |
273ea72c DG |
1036 | } |
1037 | ||
3bd1e081 | 1038 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1039 | if (sock < 0) { |
1040 | goto error; | |
1041 | } | |
1042 | ||
3bd1e081 | 1043 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1044 | |
712ea556 | 1045 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1046 | ret = lttcomm_recv_unix_sock(sock, &code, |
1047 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1048 | if (ret <= 0) { |
1049 | goto error; | |
1050 | } | |
1051 | ||
3bd1e081 MD |
1052 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1053 | consumer_data->cmd_sock = | |
1054 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1055 | if (consumer_data->cmd_sock < 0) { | |
1056 | sem_post(&consumer_data->sem); | |
48842b30 | 1057 | PERROR("consumer connect"); |
1d4b027a DG |
1058 | goto error; |
1059 | } | |
1060 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1061 | sem_post(&consumer_data->sem); |
1062 | DBG("consumer command socket ready"); | |
1d4b027a | 1063 | } else { |
3bd1e081 | 1064 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1065 | lttcomm_get_readable_code(-code)); |
1066 | goto error; | |
1067 | } | |
1068 | ||
54d01ffb | 1069 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1070 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1071 | if (ret < 0) { |
72079cae DG |
1072 | goto error; |
1073 | } | |
1074 | ||
5eb91c98 DG |
1075 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1076 | if (ret < 0) { | |
72079cae | 1077 | goto error; |
5eb91c98 DG |
1078 | } |
1079 | ||
1080 | /* Update number of fd */ | |
1081 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1082 | ||
1083 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1084 | restart_poll: |
5eb91c98 DG |
1085 | ret = lttng_poll_wait(&events, -1); |
1086 | if (ret < 0) { | |
88f2b785 MD |
1087 | /* |
1088 | * Restart interrupted system call. | |
1089 | */ | |
1090 | if (errno == EINTR) { | |
1091 | goto restart_poll; | |
1092 | } | |
72079cae DG |
1093 | goto error; |
1094 | } | |
1095 | ||
5eb91c98 DG |
1096 | for (i = 0; i < nb_fd; i++) { |
1097 | /* Fetch once the poll data */ | |
1098 | revents = LTTNG_POLL_GETEV(&events, i); | |
1099 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1100 | ||
1101 | /* Thread quit pipe has been closed. Killing thread. */ | |
1102 | ret = check_thread_quit_pipe(pollfd, revents); | |
1103 | if (ret) { | |
1104 | goto error; | |
1105 | } | |
1106 | ||
1107 | /* Event on the kconsumerd socket */ | |
1108 | if (pollfd == sock) { | |
1109 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1110 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1111 | goto error; |
1112 | } | |
1113 | } | |
1114 | } | |
1115 | ||
712ea556 | 1116 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1117 | ret = lttcomm_recv_unix_sock(sock, &code, |
1118 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1119 | if (ret <= 0) { |
3bd1e081 | 1120 | ERR("consumer closed the command socket"); |
712ea556 | 1121 | goto error; |
6f61d021 | 1122 | } |
1d4b027a | 1123 | |
3bd1e081 | 1124 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1125 | |
1d4b027a | 1126 | error: |
f22d70f0 DG |
1127 | /* Immediately set the consumerd state to stopped */ |
1128 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1129 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1130 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1131 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1132 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1133 | } else { | |
1134 | /* Code flow error... */ | |
1135 | assert(0); | |
1136 | } | |
1137 | ||
76d7553f MD |
1138 | if (consumer_data->err_sock >= 0) { |
1139 | ret = close(consumer_data->err_sock); | |
1140 | if (ret) { | |
1141 | PERROR("close"); | |
1142 | } | |
1143 | } | |
1144 | if (consumer_data->cmd_sock >= 0) { | |
1145 | ret = close(consumer_data->cmd_sock); | |
1146 | if (ret) { | |
1147 | PERROR("close"); | |
1148 | } | |
1149 | } | |
1150 | if (sock >= 0) { | |
1151 | ret = close(sock); | |
1152 | if (ret) { | |
1153 | PERROR("close"); | |
1154 | } | |
1155 | } | |
273ea72c | 1156 | |
3bd1e081 MD |
1157 | unlink(consumer_data->err_unix_sock_path); |
1158 | unlink(consumer_data->cmd_unix_sock_path); | |
1159 | consumer_data->pid = 0; | |
1d4b027a | 1160 | |
5eb91c98 | 1161 | lttng_poll_clean(&events); |
76d7553f MD |
1162 | error_poll: |
1163 | error_listen: | |
1164 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1165 | |
5eb91c98 | 1166 | return NULL; |
099e26bd DG |
1167 | } |
1168 | ||
099e26bd DG |
1169 | /* |
1170 | * This thread manage application communication. | |
1d4b027a DG |
1171 | */ |
1172 | static void *thread_manage_apps(void *data) | |
099e26bd | 1173 | { |
5eb91c98 DG |
1174 | int i, ret, pollfd; |
1175 | uint32_t revents, nb_fd; | |
099e26bd | 1176 | struct ust_command ust_cmd; |
5eb91c98 | 1177 | struct lttng_poll_event events; |
099e26bd DG |
1178 | |
1179 | DBG("[thread] Manage application started"); | |
1180 | ||
f6a9efaa DG |
1181 | rcu_register_thread(); |
1182 | rcu_thread_online(); | |
1183 | ||
5eb91c98 DG |
1184 | ret = create_thread_poll_set(&events, 2); |
1185 | if (ret < 0) { | |
76d7553f | 1186 | goto error_poll_create; |
5eb91c98 | 1187 | } |
099e26bd | 1188 | |
5eb91c98 DG |
1189 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1190 | if (ret < 0) { | |
1191 | goto error; | |
1192 | } | |
099e26bd | 1193 | |
5eb91c98 DG |
1194 | while (1) { |
1195 | /* Zeroed the events structure */ | |
1196 | lttng_poll_reset(&events); | |
0177d773 | 1197 | |
5eb91c98 | 1198 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1199 | |
1200 | DBG("Apps thread polling on %d fds", nb_fd); | |
1201 | ||
1202 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1203 | restart: |
5eb91c98 | 1204 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1205 | if (ret < 0) { |
88f2b785 MD |
1206 | /* |
1207 | * Restart interrupted system call. | |
1208 | */ | |
1209 | if (errno == EINTR) { | |
1210 | goto restart; | |
1211 | } | |
099e26bd DG |
1212 | goto error; |
1213 | } | |
1214 | ||
5eb91c98 DG |
1215 | for (i = 0; i < nb_fd; i++) { |
1216 | /* Fetch once the poll data */ | |
1217 | revents = LTTNG_POLL_GETEV(&events, i); | |
1218 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1219 | ||
1220 | /* Thread quit pipe has been closed. Killing thread. */ | |
1221 | ret = check_thread_quit_pipe(pollfd, revents); | |
1222 | if (ret) { | |
099e26bd | 1223 | goto error; |
5eb91c98 | 1224 | } |
099e26bd | 1225 | |
5eb91c98 DG |
1226 | /* Inspect the apps cmd pipe */ |
1227 | if (pollfd == apps_cmd_pipe[0]) { | |
1228 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1229 | ERR("Apps command pipe error"); | |
0177d773 | 1230 | goto error; |
5eb91c98 DG |
1231 | } else if (revents & LPOLLIN) { |
1232 | /* Empty pipe */ | |
1233 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1234 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1235 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1236 | goto error; |
1237 | } | |
099e26bd | 1238 | |
5eb91c98 | 1239 | /* Register applicaton to the session daemon */ |
56fff090 | 1240 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1241 | ust_cmd.sock); |
88ff5b7f | 1242 | if (ret == -ENOMEM) { |
5eb91c98 | 1243 | goto error; |
88ff5b7f MD |
1244 | } else if (ret < 0) { |
1245 | break; | |
5eb91c98 DG |
1246 | } |
1247 | ||
acc7b41b | 1248 | /* |
e0c7ec2b | 1249 | * Validate UST version compatibility. |
acc7b41b | 1250 | */ |
e0c7ec2b DG |
1251 | ret = ust_app_validate_version(ust_cmd.sock); |
1252 | if (ret >= 0) { | |
1253 | /* | |
1254 | * Add channel(s) and event(s) to newly registered apps | |
1255 | * from lttng global UST domain. | |
1256 | */ | |
1257 | update_ust_app(ust_cmd.sock); | |
1258 | } | |
acc7b41b | 1259 | |
f2ca2e25 | 1260 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1261 | if (ret < 0) { |
1262 | /* | |
1263 | * If the registration is not possible, we simply | |
1264 | * unregister the apps and continue | |
1265 | */ | |
56fff090 | 1266 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1267 | } else { |
1268 | /* | |
1269 | * We just need here to monitor the close of the UST | |
1270 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1271 | * Listen on POLLIN (even if we never expect any |
1272 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1273 | */ |
a9ade966 | 1274 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1275 | if (ret < 0) { |
1276 | goto error; | |
1277 | } | |
1278 | ||
54d01ffb DG |
1279 | DBG("Apps with sock %d added to poll set", |
1280 | ust_cmd.sock); | |
5eb91c98 | 1281 | } |
487cf67c | 1282 | |
5eb91c98 | 1283 | break; |
0177d773 | 1284 | } |
5eb91c98 DG |
1285 | } else { |
1286 | /* | |
54d01ffb DG |
1287 | * At this point, we know that a registered application made |
1288 | * the event at poll_wait. | |
5eb91c98 DG |
1289 | */ |
1290 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1291 | /* Removing from the poll set */ | |
1292 | ret = lttng_poll_del(&events, pollfd); | |
1293 | if (ret < 0) { | |
1294 | goto error; | |
1295 | } | |
099e26bd | 1296 | |
b9d9b220 | 1297 | /* Socket closed on remote end. */ |
56fff090 | 1298 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1299 | break; |
1300 | } | |
099e26bd DG |
1301 | } |
1302 | } | |
099e26bd DG |
1303 | } |
1304 | ||
1305 | error: | |
5eb91c98 | 1306 | lttng_poll_clean(&events); |
76d7553f MD |
1307 | error_poll_create: |
1308 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1309 | rcu_thread_offline(); |
1310 | rcu_unregister_thread(); | |
099e26bd DG |
1311 | return NULL; |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Dispatch request from the registration threads to the application | |
1316 | * communication thread. | |
1317 | */ | |
1318 | static void *thread_dispatch_ust_registration(void *data) | |
1319 | { | |
1320 | int ret; | |
1321 | struct cds_wfq_node *node; | |
1322 | struct ust_command *ust_cmd = NULL; | |
1323 | ||
1324 | DBG("[thread] Dispatch UST command started"); | |
1325 | ||
1326 | while (!dispatch_thread_exit) { | |
1327 | /* Atomically prepare the queue futex */ | |
1328 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1329 | ||
1330 | do { | |
1331 | /* Dequeue command for registration */ | |
1332 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1333 | if (node == NULL) { | |
00a17c97 | 1334 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1335 | /* Continue thread execution */ |
1336 | break; | |
1337 | } | |
1338 | ||
1339 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1340 | ||
2f50c8a3 DG |
1341 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1342 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1343 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1344 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1345 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1346 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1347 | /* |
1348 | * Inform apps thread of the new application registration. This | |
1349 | * call is blocking so we can be assured that the data will be read | |
1350 | * at some point in time or wait to the end of the world :) | |
1351 | */ | |
1352 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1353 | sizeof(struct ust_command)); | |
1354 | if (ret < 0) { | |
76d7553f | 1355 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1356 | if (errno == EBADF) { |
1357 | /* | |
1358 | * We can't inform the application thread to process | |
1359 | * registration. We will exit or else application | |
1360 | * registration will not occur and tracing will never | |
1361 | * start. | |
1362 | */ | |
1363 | goto error; | |
1364 | } | |
1365 | } | |
1366 | free(ust_cmd); | |
1367 | } while (node != NULL); | |
1368 | ||
1369 | /* Futex wait on queue. Blocking call on futex() */ | |
1370 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1371 | } | |
1372 | ||
1373 | error: | |
1374 | DBG("Dispatch thread dying"); | |
1375 | return NULL; | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * This thread manage application registration. | |
1380 | */ | |
1381 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1382 | { |
a4b35e07 | 1383 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1384 | uint32_t revents, nb_fd; |
1385 | struct lttng_poll_event events; | |
099e26bd DG |
1386 | /* |
1387 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1388 | * freed in the manage apps thread. | |
1389 | */ | |
1390 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1391 | |
099e26bd | 1392 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1393 | |
1394 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1395 | if (ret < 0) { | |
76d7553f | 1396 | goto error_listen; |
1d4b027a DG |
1397 | } |
1398 | ||
5eb91c98 DG |
1399 | /* |
1400 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1401 | * more will be added to this poll set. | |
1402 | */ | |
1403 | ret = create_thread_poll_set(&events, 2); | |
1404 | if (ret < 0) { | |
76d7553f | 1405 | goto error_create_poll; |
5eb91c98 | 1406 | } |
273ea72c | 1407 | |
5eb91c98 DG |
1408 | /* Add the application registration socket */ |
1409 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1410 | if (ret < 0) { | |
76d7553f | 1411 | goto error_poll_add; |
5eb91c98 | 1412 | } |
273ea72c | 1413 | |
1d4b027a | 1414 | /* Notify all applications to register */ |
0fdd1e2c DG |
1415 | ret = notify_ust_apps(1); |
1416 | if (ret < 0) { | |
1417 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1418 | "Execution continues but there might be problem for already\n" |
1419 | "running applications that wishes to register."); | |
0fdd1e2c | 1420 | } |
1d4b027a DG |
1421 | |
1422 | while (1) { | |
1423 | DBG("Accepting application registration"); | |
273ea72c | 1424 | |
5eb91c98 DG |
1425 | nb_fd = LTTNG_POLL_GETNB(&events); |
1426 | ||
273ea72c | 1427 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1428 | restart: |
5eb91c98 | 1429 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1430 | if (ret < 0) { |
88f2b785 MD |
1431 | /* |
1432 | * Restart interrupted system call. | |
1433 | */ | |
1434 | if (errno == EINTR) { | |
1435 | goto restart; | |
1436 | } | |
273ea72c DG |
1437 | goto error; |
1438 | } | |
1439 | ||
5eb91c98 DG |
1440 | for (i = 0; i < nb_fd; i++) { |
1441 | /* Fetch once the poll data */ | |
1442 | revents = LTTNG_POLL_GETEV(&events, i); | |
1443 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1444 | |
5eb91c98 DG |
1445 | /* Thread quit pipe has been closed. Killing thread. */ |
1446 | ret = check_thread_quit_pipe(pollfd, revents); | |
1447 | if (ret) { | |
90014c57 DG |
1448 | goto error; |
1449 | } | |
1d4b027a | 1450 | |
5eb91c98 DG |
1451 | /* Event on the registration socket */ |
1452 | if (pollfd == apps_sock) { | |
1453 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1454 | ERR("Register apps socket poll error"); | |
1455 | goto error; | |
1456 | } else if (revents & LPOLLIN) { | |
1457 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1458 | if (sock < 0) { | |
1459 | goto error; | |
1460 | } | |
099e26bd | 1461 | |
5eb91c98 | 1462 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1463 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1464 | if (ust_cmd == NULL) { |
76d7553f | 1465 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1466 | goto error; |
1467 | } | |
1d4b027a | 1468 | |
5eb91c98 DG |
1469 | /* |
1470 | * Using message-based transmissions to ensure we don't | |
1471 | * have to deal with partially received messages. | |
1472 | */ | |
4063050c MD |
1473 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1474 | if (ret < 0) { | |
1475 | ERR("Exhausted file descriptors allowed for applications."); | |
1476 | free(ust_cmd); | |
1477 | ret = close(sock); | |
1478 | if (ret) { | |
1479 | PERROR("close"); | |
1480 | } | |
1481 | sock = -1; | |
1482 | continue; | |
1483 | } | |
5eb91c98 DG |
1484 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1485 | sizeof(struct ust_register_msg)); | |
1486 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1487 | if (ret < 0) { | |
76d7553f | 1488 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1489 | } else { |
1490 | ERR("Wrong size received on apps register"); | |
1491 | } | |
1492 | free(ust_cmd); | |
76d7553f MD |
1493 | ret = close(sock); |
1494 | if (ret) { | |
1495 | PERROR("close"); | |
1496 | } | |
4063050c | 1497 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1498 | sock = -1; |
5eb91c98 DG |
1499 | continue; |
1500 | } | |
099e26bd | 1501 | |
5eb91c98 | 1502 | ust_cmd->sock = sock; |
34a2494f | 1503 | sock = -1; |
099e26bd | 1504 | |
5eb91c98 DG |
1505 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1506 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1507 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1508 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1509 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1510 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1511 | |
5eb91c98 DG |
1512 | /* |
1513 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1514 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1515 | */ |
1516 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1517 | ||
1518 | /* | |
1519 | * Wake the registration queue futex. Implicit memory | |
1520 | * barrier with the exchange in cds_wfq_enqueue. | |
1521 | */ | |
1522 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1523 | } | |
1524 | } | |
90014c57 | 1525 | } |
1d4b027a DG |
1526 | } |
1527 | ||
1528 | error: | |
0fdd1e2c DG |
1529 | /* Notify that the registration thread is gone */ |
1530 | notify_ust_apps(0); | |
1531 | ||
a4b35e07 | 1532 | if (apps_sock >= 0) { |
76d7553f MD |
1533 | ret = close(apps_sock); |
1534 | if (ret) { | |
1535 | PERROR("close"); | |
1536 | } | |
a4b35e07 | 1537 | } |
46c3f085 | 1538 | if (sock >= 0) { |
76d7553f MD |
1539 | ret = close(sock); |
1540 | if (ret) { | |
1541 | PERROR("close"); | |
1542 | } | |
4063050c | 1543 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1544 | } |
273ea72c | 1545 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1546 | |
76d7553f | 1547 | error_poll_add: |
5eb91c98 | 1548 | lttng_poll_clean(&events); |
76d7553f MD |
1549 | error_listen: |
1550 | error_create_poll: | |
1551 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1552 | |
1d4b027a DG |
1553 | return NULL; |
1554 | } | |
1555 | ||
8c0faa1d | 1556 | /* |
3bd1e081 | 1557 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1558 | * exec or it will fails. |
8c0faa1d | 1559 | */ |
3bd1e081 | 1560 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1561 | { |
1562 | int ret; | |
ee0b0061 DG |
1563 | struct timespec timeout; |
1564 | ||
1565 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1566 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1567 | |
1568 | /* Setup semaphore */ | |
3bd1e081 | 1569 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1570 | if (ret < 0) { |
3bd1e081 | 1571 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1572 | goto error; |
1573 | } | |
8c0faa1d | 1574 | |
3bd1e081 MD |
1575 | ret = pthread_create(&consumer_data->thread, NULL, |
1576 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1577 | if (ret != 0) { |
3bd1e081 | 1578 | PERROR("pthread_create consumer"); |
ee0b0061 | 1579 | ret = -1; |
8c0faa1d DG |
1580 | goto error; |
1581 | } | |
1582 | ||
ee0b0061 DG |
1583 | /* Get time for sem_timedwait absolute timeout */ |
1584 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1585 | if (ret < 0) { | |
3bd1e081 | 1586 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1587 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1588 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1589 | } else { |
1590 | /* Normal timeout if the gettime was successful */ | |
1591 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1592 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1593 | } |
8c0faa1d | 1594 | |
ee0b0061 DG |
1595 | if (ret < 0) { |
1596 | if (errno == ETIMEDOUT) { | |
1597 | /* | |
1598 | * Call has timed out so we kill the kconsumerd_thread and return | |
1599 | * an error. | |
1600 | */ | |
3bd1e081 MD |
1601 | ERR("The consumer thread was never ready. Killing it"); |
1602 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1603 | if (ret < 0) { |
3bd1e081 | 1604 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1605 | } |
1606 | } else { | |
3bd1e081 | 1607 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1608 | } |
1609 | goto error; | |
1610 | } | |
1611 | ||
3bd1e081 MD |
1612 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1613 | if (consumer_data->pid == 0) { | |
712ea556 | 1614 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1615 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1616 | goto error; |
1617 | } | |
3bd1e081 | 1618 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1619 | |
8c0faa1d DG |
1620 | return 0; |
1621 | ||
1622 | error: | |
1623 | return ret; | |
1624 | } | |
1625 | ||
d9800920 | 1626 | /* |
3bd1e081 | 1627 | * Join consumer thread |
d9800920 | 1628 | */ |
3bd1e081 | 1629 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1630 | { |
1631 | void *status; | |
1632 | int ret; | |
1633 | ||
3bd1e081 MD |
1634 | if (consumer_data->pid != 0) { |
1635 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1636 | if (ret) { |
3bd1e081 | 1637 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1638 | return ret; |
1639 | } | |
3bd1e081 | 1640 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1641 | } else { |
1642 | return 0; | |
1643 | } | |
1644 | } | |
1645 | ||
8c0faa1d | 1646 | /* |
3bd1e081 | 1647 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1648 | * |
d063d709 | 1649 | * Return pid if successful else -1. |
8c0faa1d | 1650 | */ |
3bd1e081 | 1651 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1652 | { |
1653 | int ret; | |
1654 | pid_t pid; | |
94c55f17 | 1655 | const char *consumer_to_use; |
53086306 | 1656 | const char *verbosity; |
94c55f17 | 1657 | struct stat st; |
8c0faa1d | 1658 | |
3bd1e081 | 1659 | DBG("Spawning consumerd"); |
c49dc785 | 1660 | |
8c0faa1d DG |
1661 | pid = fork(); |
1662 | if (pid == 0) { | |
1663 | /* | |
3bd1e081 | 1664 | * Exec consumerd. |
8c0faa1d | 1665 | */ |
daee5345 | 1666 | if (opt_verbose_consumer) { |
53086306 DG |
1667 | verbosity = "--verbose"; |
1668 | } else { | |
1669 | verbosity = "--quiet"; | |
1670 | } | |
3bd1e081 MD |
1671 | switch (consumer_data->type) { |
1672 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1673 | /* |
c7704d57 DG |
1674 | * Find out which consumerd to execute. We will first try the |
1675 | * 64-bit path, then the sessiond's installation directory, and | |
1676 | * fallback on the 32-bit one, | |
94c55f17 | 1677 | */ |
63a799e8 AM |
1678 | DBG3("Looking for a kernel consumer at these locations:"); |
1679 | DBG3(" 1) %s", consumerd64_bin); | |
1680 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1681 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1682 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1683 | DBG3("Found location #1"); |
94c55f17 | 1684 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1685 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1686 | DBG3("Found location #2"); |
94c55f17 | 1687 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1688 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1689 | DBG3("Found location #3"); |
eb1e0bd4 | 1690 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1691 | } else { |
63a799e8 | 1692 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1693 | break; |
1694 | } | |
1695 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1696 | execl(consumer_to_use, | |
1697 | "lttng-consumerd", verbosity, "-k", | |
1698 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1699 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1700 | NULL); | |
3bd1e081 | 1701 | break; |
7753dea8 MD |
1702 | case LTTNG_CONSUMER64_UST: |
1703 | { | |
b1e0b6b6 | 1704 | char *tmpnew = NULL; |
8f4905da MD |
1705 | |
1706 | if (consumerd64_libdir[0] != '\0') { | |
1707 | char *tmp; | |
1708 | size_t tmplen; | |
1709 | ||
1710 | tmp = getenv("LD_LIBRARY_PATH"); | |
1711 | if (!tmp) { | |
1712 | tmp = ""; | |
1713 | } | |
1714 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1715 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1716 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1717 | if (!tmpnew) { | |
1718 | ret = -ENOMEM; | |
1719 | goto error; | |
1720 | } | |
1721 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1722 | strcat(tmpnew, consumerd64_libdir); | |
1723 | if (tmp[0] != '\0') { | |
1724 | strcat(tmpnew, ":"); | |
1725 | strcat(tmpnew, tmp); | |
1726 | } | |
1727 | ret = putenv(tmpnew); | |
1728 | if (ret) { | |
1729 | ret = -errno; | |
1730 | goto error; | |
1731 | } | |
1732 | } | |
94c55f17 | 1733 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1734 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1735 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1736 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1737 | NULL); | |
8f4905da MD |
1738 | if (consumerd64_libdir[0] != '\0') { |
1739 | free(tmpnew); | |
1740 | } | |
1741 | if (ret) { | |
1742 | goto error; | |
1743 | } | |
3bd1e081 | 1744 | break; |
7753dea8 MD |
1745 | } |
1746 | case LTTNG_CONSUMER32_UST: | |
1747 | { | |
937dde8e | 1748 | char *tmpnew = NULL; |
8f4905da MD |
1749 | |
1750 | if (consumerd32_libdir[0] != '\0') { | |
1751 | char *tmp; | |
1752 | size_t tmplen; | |
1753 | ||
1754 | tmp = getenv("LD_LIBRARY_PATH"); | |
1755 | if (!tmp) { | |
1756 | tmp = ""; | |
1757 | } | |
1758 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1759 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1760 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1761 | if (!tmpnew) { | |
1762 | ret = -ENOMEM; | |
1763 | goto error; | |
1764 | } | |
1765 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1766 | strcat(tmpnew, consumerd32_libdir); | |
1767 | if (tmp[0] != '\0') { | |
1768 | strcat(tmpnew, ":"); | |
1769 | strcat(tmpnew, tmp); | |
1770 | } | |
1771 | ret = putenv(tmpnew); | |
1772 | if (ret) { | |
1773 | ret = -errno; | |
1774 | goto error; | |
1775 | } | |
1776 | } | |
94c55f17 | 1777 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1778 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1779 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1780 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1781 | NULL); | |
8f4905da MD |
1782 | if (consumerd32_libdir[0] != '\0') { |
1783 | free(tmpnew); | |
1784 | } | |
1785 | if (ret) { | |
1786 | goto error; | |
1787 | } | |
7753dea8 MD |
1788 | break; |
1789 | } | |
3bd1e081 | 1790 | default: |
76d7553f | 1791 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1792 | exit(EXIT_FAILURE); |
1793 | } | |
8c0faa1d | 1794 | if (errno != 0) { |
76d7553f | 1795 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1796 | } |
1797 | exit(EXIT_FAILURE); | |
1798 | } else if (pid > 0) { | |
1799 | ret = pid; | |
8c0faa1d | 1800 | } else { |
76d7553f | 1801 | PERROR("start consumer fork"); |
8c0faa1d | 1802 | ret = -errno; |
8c0faa1d | 1803 | } |
8f4905da | 1804 | error: |
8c0faa1d DG |
1805 | return ret; |
1806 | } | |
1807 | ||
693bd40b | 1808 | /* |
3bd1e081 | 1809 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1810 | */ |
3bd1e081 | 1811 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1812 | { |
1813 | int ret; | |
1814 | ||
3bd1e081 MD |
1815 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1816 | if (consumer_data->pid != 0) { | |
1817 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1818 | goto end; |
1819 | } | |
693bd40b | 1820 | |
3bd1e081 | 1821 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1822 | if (ret < 0) { |
3bd1e081 MD |
1823 | ERR("Spawning consumerd failed"); |
1824 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1825 | goto error; |
693bd40b | 1826 | } |
c49dc785 | 1827 | |
3bd1e081 MD |
1828 | /* Setting up the consumer_data pid */ |
1829 | consumer_data->pid = ret; | |
48842b30 | 1830 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1831 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1832 | |
3bd1e081 MD |
1833 | DBG2("Spawning consumer control thread"); |
1834 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1835 | if (ret < 0) { |
3bd1e081 | 1836 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1837 | goto error; |
1838 | } | |
1839 | ||
c49dc785 | 1840 | end: |
693bd40b DG |
1841 | return 0; |
1842 | ||
1843 | error: | |
1844 | return ret; | |
1845 | } | |
1846 | ||
b73401da | 1847 | /* |
096102bd | 1848 | * Check version of the lttng-modules. |
b73401da | 1849 | */ |
096102bd | 1850 | static int validate_lttng_modules_version(void) |
b73401da | 1851 | { |
096102bd | 1852 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1853 | } |
1854 | ||
b73401da | 1855 | /* |
096102bd | 1856 | * Setup necessary data for kernel tracer action. |
b73401da | 1857 | */ |
096102bd | 1858 | static int init_kernel_tracer(void) |
b73401da DG |
1859 | { |
1860 | int ret; | |
b73401da | 1861 | |
096102bd DG |
1862 | /* Modprobe lttng kernel modules */ |
1863 | ret = modprobe_lttng_control(); | |
b73401da | 1864 | if (ret < 0) { |
b73401da DG |
1865 | goto error; |
1866 | } | |
1867 | ||
096102bd DG |
1868 | /* Open debugfs lttng */ |
1869 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1870 | if (kernel_tracer_fd < 0) { | |
1871 | DBG("Failed to open %s", module_proc_lttng); | |
1872 | ret = -1; | |
1873 | goto error_open; | |
b73401da DG |
1874 | } |
1875 | ||
096102bd DG |
1876 | /* Validate kernel version */ |
1877 | ret = validate_lttng_modules_version(); | |
b73401da | 1878 | if (ret < 0) { |
096102bd | 1879 | goto error_version; |
b73401da DG |
1880 | } |
1881 | ||
096102bd | 1882 | ret = modprobe_lttng_data(); |
b73401da | 1883 | if (ret < 0) { |
096102bd | 1884 | goto error_modules; |
8c0faa1d DG |
1885 | } |
1886 | ||
f3ed775e | 1887 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1888 | return 0; |
1889 | ||
1890 | error_version: | |
1891 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1892 | ret = close(kernel_tracer_fd); |
1893 | if (ret) { | |
1894 | PERROR("close"); | |
1895 | } | |
1896 | kernel_tracer_fd = -1; | |
096102bd DG |
1897 | return LTTCOMM_KERN_VERSION; |
1898 | ||
1899 | error_modules: | |
76d7553f MD |
1900 | ret = close(kernel_tracer_fd); |
1901 | if (ret) { | |
1902 | PERROR("close"); | |
1903 | } | |
096102bd DG |
1904 | |
1905 | error_open: | |
1906 | modprobe_remove_lttng_control(); | |
b73401da DG |
1907 | |
1908 | error: | |
b73401da | 1909 | WARN("No kernel tracer available"); |
a4b35e07 | 1910 | kernel_tracer_fd = -1; |
531d29f9 MD |
1911 | if (!is_root) { |
1912 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1913 | } else { | |
1914 | return LTTCOMM_KERN_NA; | |
1915 | } | |
f3ed775e | 1916 | } |
33a2b854 | 1917 | |
f3ed775e | 1918 | /* |
54d01ffb | 1919 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1920 | */ |
54d01ffb | 1921 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1922 | { |
f40799e8 | 1923 | int ret = 0; |
8c0faa1d | 1924 | |
3bd1e081 | 1925 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1926 | /* |
54d01ffb | 1927 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1928 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1929 | * an extra security check. |
d9800920 | 1930 | */ |
03550b58 | 1931 | if (session->consumer_fd < 0) { |
3bd1e081 | 1932 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1933 | } |
1934 | ||
2bdd86d4 | 1935 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1936 | if (ret < 0) { |
f3ed775e DG |
1937 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1938 | goto error; | |
1939 | } | |
1d4b027a | 1940 | |
3bd1e081 | 1941 | session->consumer_fds_sent = 1; |
f3ed775e | 1942 | } |
1d4b027a DG |
1943 | |
1944 | error: | |
1945 | return ret; | |
8c0faa1d DG |
1946 | } |
1947 | ||
0177d773 DG |
1948 | /* |
1949 | * Create an UST session and add it to the session ust list. | |
1950 | */ | |
44d3bd01 | 1951 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1952 | struct lttng_domain *domain) |
0177d773 | 1953 | { |
13384287 | 1954 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1955 | int ret; |
44d3bd01 DG |
1956 | |
1957 | switch (domain->type) { | |
48842b30 | 1958 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1959 | break; |
1960 | default: | |
13384287 | 1961 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1962 | goto error; |
1963 | } | |
0177d773 DG |
1964 | |
1965 | DBG("Creating UST session"); | |
1966 | ||
a991f516 | 1967 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1968 | if (lus == NULL) { |
44d3bd01 | 1969 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1970 | goto error; |
1971 | } | |
1972 | ||
e11d277b | 1973 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1974 | session->uid, session->gid); |
0177d773 DG |
1975 | if (ret < 0) { |
1976 | if (ret != -EEXIST) { | |
1977 | ERR("Trace directory creation error"); | |
44d3bd01 | 1978 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1979 | goto error; |
1980 | } | |
1981 | } | |
1982 | ||
f6a9efaa DG |
1983 | /* The domain type dictate different actions on session creation */ |
1984 | switch (domain->type) { | |
48842b30 DG |
1985 | case LTTNG_DOMAIN_UST: |
1986 | /* No ustctl for the global UST domain */ | |
1987 | break; | |
1988 | default: | |
36dc12cc | 1989 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1990 | goto error; |
0177d773 | 1991 | } |
6df2e2c9 MD |
1992 | lus->uid = session->uid; |
1993 | lus->gid = session->gid; | |
f6a9efaa | 1994 | session->ust_session = lus; |
44d3bd01 DG |
1995 | |
1996 | return LTTCOMM_OK; | |
0177d773 DG |
1997 | |
1998 | error: | |
1999 | free(lus); | |
2000 | return ret; | |
2001 | } | |
2002 | ||
333f285e | 2003 | /* |
d063d709 | 2004 | * Create a kernel tracer session then create the default channel. |
333f285e | 2005 | */ |
6df2e2c9 | 2006 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2007 | { |
f3ed775e | 2008 | int ret; |
f3ed775e DG |
2009 | |
2010 | DBG("Creating kernel session"); | |
2011 | ||
2012 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2013 | if (ret < 0) { | |
2014 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2015 | goto error; | |
333f285e DG |
2016 | } |
2017 | ||
d9800920 | 2018 | /* Set kernel consumer socket fd */ |
03550b58 | 2019 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 2020 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
2021 | } |
2022 | ||
e11d277b | 2023 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 2024 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2025 | if (ret < 0) { |
996b65c8 | 2026 | if (ret != -EEXIST) { |
7a485870 DG |
2027 | ERR("Trace directory creation error"); |
2028 | goto error; | |
2029 | } | |
2030 | } | |
6df2e2c9 MD |
2031 | session->kernel_session->uid = session->uid; |
2032 | session->kernel_session->gid = session->gid; | |
7a485870 | 2033 | |
f3ed775e DG |
2034 | error: |
2035 | return ret; | |
333f285e DG |
2036 | } |
2037 | ||
8e0af1b4 | 2038 | /* |
c7704d57 DG |
2039 | * Check if the UID or GID match the session. Root user has access to all |
2040 | * sessions. | |
8e0af1b4 | 2041 | */ |
c7704d57 | 2042 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 2043 | { |
c7704d57 | 2044 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2045 | return 0; |
2046 | } else { | |
2047 | return 1; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2052 | { | |
2053 | unsigned int i = 0; | |
2054 | struct ltt_session *session; | |
2055 | ||
2056 | DBG("Counting number of available session for UID %d GID %d", | |
2057 | uid, gid); | |
2058 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2059 | /* | |
2060 | * Only list the sessions the user can control. | |
2061 | */ | |
2062 | if (!session_access_ok(session, uid, gid)) { | |
2063 | continue; | |
2064 | } | |
2065 | i++; | |
2066 | } | |
2067 | return i; | |
2068 | } | |
2069 | ||
6c9cc2ab DG |
2070 | /* |
2071 | * Using the session list, filled a lttng_session array to send back to the | |
2072 | * client for session listing. | |
2073 | * | |
2074 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2075 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2076 | */ |
c7704d57 DG |
2077 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2078 | gid_t gid) | |
6c9cc2ab | 2079 | { |
8e0af1b4 | 2080 | unsigned int i = 0; |
6c9cc2ab DG |
2081 | struct ltt_session *session; |
2082 | ||
8e0af1b4 MD |
2083 | DBG("Getting all available session for UID %d GID %d", |
2084 | uid, gid); | |
6c9cc2ab DG |
2085 | /* |
2086 | * Iterate over session list and append data after the control struct in | |
2087 | * the buffer. | |
2088 | */ | |
2089 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2090 | /* |
2091 | * Only list the sessions the user can control. | |
2092 | */ | |
2093 | if (!session_access_ok(session, uid, gid)) { | |
2094 | continue; | |
2095 | } | |
6c9cc2ab | 2096 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2097 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2098 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2099 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2100 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2101 | i++; |
2102 | } | |
2103 | } | |
2104 | ||
9f19cc17 DG |
2105 | /* |
2106 | * Fill lttng_channel array of all channels. | |
2107 | */ | |
b551a063 | 2108 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2109 | struct lttng_channel *channels) |
2110 | { | |
2111 | int i = 0; | |
2112 | struct ltt_kernel_channel *kchan; | |
2113 | ||
2114 | DBG("Listing channels for session %s", session->name); | |
2115 | ||
b551a063 DG |
2116 | switch (domain) { |
2117 | case LTTNG_DOMAIN_KERNEL: | |
2118 | /* Kernel channels */ | |
2119 | if (session->kernel_session != NULL) { | |
2120 | cds_list_for_each_entry(kchan, | |
2121 | &session->kernel_session->channel_list.head, list) { | |
2122 | /* Copy lttng_channel struct to array */ | |
2123 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2124 | channels[i].enabled = kchan->enabled; | |
2125 | i++; | |
2126 | } | |
2127 | } | |
2128 | break; | |
2129 | case LTTNG_DOMAIN_UST: | |
2130 | { | |
bec39940 | 2131 | struct lttng_ht_iter iter; |
b551a063 DG |
2132 | struct ltt_ust_channel *uchan; |
2133 | ||
bec39940 DG |
2134 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2135 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2136 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2137 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2138 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2139 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2140 | channels[i].attr.switch_timer_interval = | |
2141 | uchan->attr.switch_timer_interval; | |
2142 | channels[i].attr.read_timer_interval = | |
2143 | uchan->attr.read_timer_interval; | |
aea829b3 | 2144 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2145 | switch (uchan->attr.output) { |
2146 | case LTTNG_UST_MMAP: | |
2147 | default: | |
2148 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2149 | break; | |
2150 | } | |
befe0905 | 2151 | i++; |
b551a063 DG |
2152 | } |
2153 | break; | |
2154 | } | |
2155 | default: | |
2156 | break; | |
2157 | } | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * Create a list of ust global domain events. | |
2162 | */ | |
2163 | static int list_lttng_ust_global_events(char *channel_name, | |
2164 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2165 | { | |
2166 | int i = 0, ret = 0; | |
2167 | unsigned int nb_event = 0; | |
bec39940 DG |
2168 | struct lttng_ht_iter iter; |
2169 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2170 | struct ltt_ust_channel *uchan; |
2171 | struct ltt_ust_event *uevent; | |
2172 | struct lttng_event *tmp; | |
2173 | ||
2174 | DBG("Listing UST global events for channel %s", channel_name); | |
2175 | ||
2176 | rcu_read_lock(); | |
2177 | ||
bec39940 DG |
2178 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2179 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2180 | if (node == NULL) { |
2181 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2182 | goto error; | |
b551a063 DG |
2183 | } |
2184 | ||
bec39940 | 2185 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2186 | |
bec39940 | 2187 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2188 | |
b551a063 DG |
2189 | if (nb_event == 0) { |
2190 | ret = nb_event; | |
2191 | goto error; | |
2192 | } | |
2193 | ||
2194 | DBG3("Listing UST global %d events", nb_event); | |
2195 | ||
2196 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2197 | if (tmp == NULL) { | |
2198 | ret = -LTTCOMM_FATAL; | |
2199 | goto error; | |
2200 | } | |
2201 | ||
bec39940 | 2202 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2203 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2204 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2205 | tmp[i].enabled = uevent->enabled; | |
2206 | switch (uevent->attr.instrumentation) { | |
2207 | case LTTNG_UST_TRACEPOINT: | |
2208 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2209 | break; | |
2210 | case LTTNG_UST_PROBE: | |
2211 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2212 | break; | |
2213 | case LTTNG_UST_FUNCTION: | |
2214 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2215 | break; | |
0cda4f28 | 2216 | } |
8005f29a | 2217 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2218 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2219 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2220 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2221 | break; |
8005f29a | 2222 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2223 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2224 | break; |
2225 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2226 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2227 | break; |
9f19cc17 | 2228 | } |
d7b75b30 | 2229 | i++; |
9f19cc17 DG |
2230 | } |
2231 | ||
b551a063 DG |
2232 | ret = nb_event; |
2233 | *events = tmp; | |
2234 | ||
2235 | error: | |
2236 | rcu_read_unlock(); | |
2237 | return ret; | |
9f19cc17 DG |
2238 | } |
2239 | ||
2240 | /* | |
b551a063 | 2241 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2242 | */ |
b551a063 DG |
2243 | static int list_lttng_kernel_events(char *channel_name, |
2244 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2245 | { |
b551a063 DG |
2246 | int i = 0, ret; |
2247 | unsigned int nb_event; | |
9f19cc17 | 2248 | struct ltt_kernel_event *event; |
b551a063 DG |
2249 | struct ltt_kernel_channel *kchan; |
2250 | ||
2251 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2252 | if (kchan == NULL) { | |
2253 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2254 | goto error; | |
2255 | } | |
2256 | ||
2257 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2258 | |
2259 | DBG("Listing events for channel %s", kchan->channel->name); | |
2260 | ||
b551a063 DG |
2261 | if (nb_event == 0) { |
2262 | ret = nb_event; | |
2263 | goto error; | |
2264 | } | |
2265 | ||
2266 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2267 | if (*events == NULL) { | |
2268 | ret = LTTCOMM_FATAL; | |
2269 | goto error; | |
2270 | } | |
2271 | ||
9f19cc17 DG |
2272 | /* Kernel channels */ |
2273 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2274 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2275 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2276 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2277 | switch (event->event->instrumentation) { |
2278 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2279 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2280 | break; |
2281 | case LTTNG_KERNEL_KPROBE: | |
2282 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2283 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2284 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2285 | sizeof(struct lttng_kernel_kprobe)); |
2286 | break; | |
2287 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2288 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2289 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2290 | sizeof(struct lttng_kernel_function)); |
2291 | break; | |
0133c199 | 2292 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2293 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2294 | break; |
a54bd42d | 2295 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2296 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2297 | break; |
7a3d1328 MD |
2298 | case LTTNG_KERNEL_ALL: |
2299 | assert(0); | |
2300 | break; | |
9f19cc17 DG |
2301 | } |
2302 | i++; | |
2303 | } | |
b551a063 DG |
2304 | |
2305 | return nb_event; | |
2306 | ||
2307 | error: | |
2308 | return ret; | |
9f19cc17 DG |
2309 | } |
2310 | ||
fac6795d | 2311 | /* |
54d01ffb | 2312 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2313 | */ |
54d01ffb DG |
2314 | static int cmd_disable_channel(struct ltt_session *session, |
2315 | int domain, char *channel_name) | |
fac6795d | 2316 | { |
54d01ffb | 2317 | int ret; |
78f0bacd DG |
2318 | struct ltt_ust_session *usess; |
2319 | ||
2320 | usess = session->ust_session; | |
379473d2 | 2321 | |
54d01ffb | 2322 | switch (domain) { |
78f0bacd DG |
2323 | case LTTNG_DOMAIN_KERNEL: |
2324 | { | |
2325 | ret = channel_kernel_disable(session->kernel_session, | |
2326 | channel_name); | |
2327 | if (ret != LTTCOMM_OK) { | |
2328 | goto error; | |
2329 | } | |
54d01ffb | 2330 | |
78f0bacd DG |
2331 | kernel_wait_quiescent(kernel_tracer_fd); |
2332 | break; | |
2333 | } | |
2334 | case LTTNG_DOMAIN_UST: | |
2335 | { | |
2336 | struct ltt_ust_channel *uchan; | |
bec39940 | 2337 | struct lttng_ht *chan_ht; |
78f0bacd | 2338 | |
7885e399 DG |
2339 | chan_ht = usess->domain_global.channels; |
2340 | ||
2341 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2342 | if (uchan == NULL) { |
2343 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2344 | goto error; |
78f0bacd DG |
2345 | } |
2346 | ||
7885e399 DG |
2347 | ret = channel_ust_disable(usess, domain, uchan); |
2348 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2349 | goto error; |
2350 | } | |
78f0bacd DG |
2351 | break; |
2352 | } | |
d78d6610 | 2353 | #if 0 |
78f0bacd DG |
2354 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2355 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2356 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2357 | #endif |
78f0bacd DG |
2358 | default: |
2359 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2360 | goto error; | |
20fe2104 DG |
2361 | } |
2362 | ||
54d01ffb | 2363 | ret = LTTCOMM_OK; |
d65106b1 | 2364 | |
54d01ffb DG |
2365 | error: |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2371 | */ | |
44d3bd01 | 2372 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2373 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2374 | { |
2375 | int ret; | |
f6a9efaa | 2376 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2377 | struct lttng_ht *chan_ht; |
f6a9efaa | 2378 | |
5d56b5aa | 2379 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2380 | |
aea829b3 | 2381 | switch (domain) { |
44d3bd01 DG |
2382 | case LTTNG_DOMAIN_KERNEL: |
2383 | { | |
2384 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2385 | |
44d3bd01 DG |
2386 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2387 | session->kernel_session); | |
2388 | if (kchan == NULL) { | |
2389 | ret = channel_kernel_create(session->kernel_session, | |
2390 | attr, kernel_poll_pipe[1]); | |
2391 | } else { | |
2392 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2393 | } | |
2394 | ||
2395 | if (ret != LTTCOMM_OK) { | |
2396 | goto error; | |
2397 | } | |
2398 | ||
2399 | kernel_wait_quiescent(kernel_tracer_fd); | |
2400 | break; | |
2401 | } | |
f6a9efaa DG |
2402 | case LTTNG_DOMAIN_UST: |
2403 | { | |
2404 | struct ltt_ust_channel *uchan; | |
2405 | ||
7885e399 | 2406 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2407 | |
7885e399 | 2408 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2409 | if (uchan == NULL) { |
7885e399 | 2410 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2411 | } else { |
7885e399 | 2412 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2413 | } |
f6a9efaa DG |
2414 | break; |
2415 | } | |
d78d6610 | 2416 | #if 0 |
78f0bacd DG |
2417 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2418 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2419 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2420 | #endif |
44d3bd01 DG |
2421 | default: |
2422 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2423 | goto error; | |
54d01ffb DG |
2424 | } |
2425 | ||
54d01ffb DG |
2426 | error: |
2427 | return ret; | |
2428 | } | |
2429 | ||
2430 | /* | |
2431 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2432 | */ | |
2433 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2434 | char *channel_name, char *event_name) | |
2435 | { | |
2436 | int ret; | |
54d01ffb DG |
2437 | |
2438 | switch (domain) { | |
2439 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2440 | { |
2441 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2442 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2443 | |
b0a40d28 DG |
2444 | ksess = session->kernel_session; |
2445 | ||
2446 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2447 | if (kchan == NULL) { |
2448 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2449 | goto error; | |
d65106b1 DG |
2450 | } |
2451 | ||
b0a40d28 | 2452 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2453 | if (ret != LTTCOMM_OK) { |
2454 | goto error; | |
2455 | } | |
2456 | ||
2457 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2458 | break; |
2bdd86d4 MD |
2459 | } |
2460 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2461 | { |
b0a40d28 | 2462 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2463 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2464 | |
2465 | usess = session->ust_session; | |
2466 | ||
2467 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2468 | channel_name); | |
2469 | if (uchan == NULL) { | |
2470 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2471 | goto error; | |
2472 | } | |
2473 | ||
7f79d3a1 DG |
2474 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2475 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2476 | goto error; |
2477 | } | |
2478 | ||
7f79d3a1 | 2479 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2480 | channel_name); |
b0a40d28 DG |
2481 | break; |
2482 | } | |
d78d6610 | 2483 | #if 0 |
2bdd86d4 MD |
2484 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2485 | case LTTNG_DOMAIN_UST_PID: | |
2486 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2487 | #endif |
54d01ffb | 2488 | default: |
1ab1ea0b | 2489 | ret = LTTCOMM_UND; |
54d01ffb | 2490 | goto error; |
d65106b1 | 2491 | } |
26cc6b4e | 2492 | |
54d01ffb DG |
2493 | ret = LTTCOMM_OK; |
2494 | ||
2495 | error: | |
2496 | return ret; | |
2497 | } | |
2498 | ||
2499 | /* | |
2500 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2501 | */ | |
2502 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2503 | char *channel_name) | |
2504 | { | |
2505 | int ret; | |
54d01ffb DG |
2506 | |
2507 | switch (domain) { | |
2508 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2509 | { |
2510 | struct ltt_kernel_session *ksess; | |
2511 | struct ltt_kernel_channel *kchan; | |
2512 | ||
2513 | ksess = session->kernel_session; | |
2514 | ||
2515 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2516 | if (kchan == NULL) { |
2517 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2518 | goto error; | |
26cc6b4e DG |
2519 | } |
2520 | ||
9730260e | 2521 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2522 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2523 | goto error; |
26cc6b4e DG |
2524 | } |
2525 | ||
54d01ffb | 2526 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2527 | break; |
9730260e DG |
2528 | } |
2529 | case LTTNG_DOMAIN_UST: | |
2530 | { | |
2531 | struct ltt_ust_session *usess; | |
2532 | struct ltt_ust_channel *uchan; | |
2533 | ||
2534 | usess = session->ust_session; | |
2535 | ||
2536 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2537 | channel_name); | |
2538 | if (uchan == NULL) { | |
2539 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2540 | goto error; | |
2541 | } | |
2542 | ||
7f79d3a1 DG |
2543 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2544 | if (ret != 0) { | |
9730260e DG |
2545 | goto error; |
2546 | } | |
2547 | ||
7f79d3a1 | 2548 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2549 | |
2550 | break; | |
2551 | } | |
d78d6610 | 2552 | #if 0 |
9730260e DG |
2553 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2554 | case LTTNG_DOMAIN_UST_PID: | |
2555 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2556 | #endif |
54d01ffb | 2557 | default: |
1ab1ea0b | 2558 | ret = LTTCOMM_UND; |
54d01ffb | 2559 | goto error; |
26cc6b4e | 2560 | } |
e953ef25 | 2561 | |
54d01ffb | 2562 | ret = LTTCOMM_OK; |
e953ef25 | 2563 | |
54d01ffb DG |
2564 | error: |
2565 | return ret; | |
2566 | } | |
f5177a38 | 2567 | |
54d01ffb DG |
2568 | /* |
2569 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2570 | */ | |
2571 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2572 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2573 | { | |
2574 | int ret; | |
f5177a38 | 2575 | |
54d01ffb DG |
2576 | switch (domain) { |
2577 | case LTTNG_DOMAIN_KERNEL: | |
2578 | /* Add kernel context to kernel tracer */ | |
2579 | ret = context_kernel_add(session->kernel_session, ctx, | |
2580 | event_name, channel_name); | |
2581 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2582 | goto error; |
e953ef25 | 2583 | } |
2bdd86d4 MD |
2584 | break; |
2585 | case LTTNG_DOMAIN_UST: | |
2586 | { | |
55cc08a6 | 2587 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2588 | |
55cc08a6 DG |
2589 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2590 | if (ret != LTTCOMM_OK) { | |
2591 | goto error; | |
2bdd86d4 | 2592 | } |
e953ef25 | 2593 | break; |
2bdd86d4 | 2594 | } |
d78d6610 | 2595 | #if 0 |
55cc08a6 DG |
2596 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2597 | case LTTNG_DOMAIN_UST_PID: | |
2598 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2599 | #endif |
54d01ffb | 2600 | default: |
1ab1ea0b | 2601 | ret = LTTCOMM_UND; |
54d01ffb | 2602 | goto error; |
e953ef25 | 2603 | } |
950131af | 2604 | |
54d01ffb | 2605 | ret = LTTCOMM_OK; |
950131af | 2606 | |
54d01ffb DG |
2607 | error: |
2608 | return ret; | |
2609 | } | |
2610 | ||
2611 | /* | |
2612 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2613 | */ | |
2614 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2615 | char *channel_name, struct lttng_event *event) | |
2616 | { | |
2617 | int ret; | |
f6cd6b0f | 2618 | struct lttng_channel *attr; |
48842b30 | 2619 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2620 | |
2621 | switch (domain) { | |
2622 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2623 | { |
2624 | struct ltt_kernel_channel *kchan; | |
2625 | ||
54d01ffb DG |
2626 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2627 | session->kernel_session); | |
2628 | if (kchan == NULL) { | |
f6cd6b0f DG |
2629 | attr = channel_new_default_attr(domain); |
2630 | if (attr == NULL) { | |
2631 | ret = LTTCOMM_FATAL; | |
2632 | goto error; | |
2633 | } | |
2634 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2635 | ||
54d01ffb | 2636 | /* This call will notify the kernel thread */ |
44d3bd01 | 2637 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2638 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2639 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2640 | free(attr); |
f5177a38 DG |
2641 | goto error; |
2642 | } | |
ff4d74e6 | 2643 | free(attr); |
54d01ffb | 2644 | } |
950131af | 2645 | |
54d01ffb DG |
2646 | /* Get the newly created kernel channel pointer */ |
2647 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2648 | session->kernel_session); | |
2649 | if (kchan == NULL) { | |
2650 | /* This sould not happen... */ | |
2651 | ret = LTTCOMM_FATAL; | |
2652 | goto error; | |
2653 | } | |
f5177a38 | 2654 | |
48842b30 DG |
2655 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2656 | event); | |
54d01ffb | 2657 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2658 | goto error; |
950131af DG |
2659 | } |
2660 | ||
54d01ffb | 2661 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2662 | break; |
2bdd86d4 MD |
2663 | } |
2664 | case LTTNG_DOMAIN_UST: | |
2665 | { | |
aea829b3 | 2666 | struct lttng_channel *attr; |
edb67388 | 2667 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2668 | |
edb67388 | 2669 | /* Get channel from global UST domain */ |
48842b30 DG |
2670 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2671 | channel_name); | |
2672 | if (uchan == NULL) { | |
aea829b3 DG |
2673 | /* Create default channel */ |
2674 | attr = channel_new_default_attr(domain); | |
2675 | if (attr == NULL) { | |
2676 | ret = LTTCOMM_FATAL; | |
2677 | goto error; | |
2678 | } | |
596219f7 | 2679 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2680 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2681 | |
7885e399 | 2682 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2683 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2684 | free(attr); |
aea829b3 DG |
2685 | goto error; |
2686 | } | |
aea829b3 DG |
2687 | free(attr); |
2688 | ||
2689 | /* Get the newly created channel reference back */ | |
2690 | uchan = trace_ust_find_channel_by_name( | |
2691 | usess->domain_global.channels, channel_name); | |
2692 | if (uchan == NULL) { | |
2693 | /* Something is really wrong */ | |
2694 | ret = LTTCOMM_FATAL; | |
2695 | goto error; | |
2696 | } | |
48842b30 | 2697 | } |
2bdd86d4 | 2698 | |
edb67388 | 2699 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2700 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2701 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2702 | goto error; |
2bdd86d4 MD |
2703 | } |
2704 | break; | |
2705 | } | |
d78d6610 | 2706 | #if 0 |
2bdd86d4 MD |
2707 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2708 | case LTTNG_DOMAIN_UST_PID: | |
2709 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2710 | #endif |
54d01ffb | 2711 | default: |
1ab1ea0b | 2712 | ret = LTTCOMM_UND; |
54d01ffb | 2713 | goto error; |
950131af | 2714 | } |
d36b8583 | 2715 | |
54d01ffb | 2716 | ret = LTTCOMM_OK; |
d36b8583 | 2717 | |
54d01ffb DG |
2718 | error: |
2719 | return ret; | |
2720 | } | |
7d29a247 | 2721 | |
54d01ffb DG |
2722 | /* |
2723 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2724 | */ | |
2725 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2726 | char *channel_name, int event_type) |
54d01ffb DG |
2727 | { |
2728 | int ret; | |
2729 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2730 | |
54d01ffb DG |
2731 | switch (domain) { |
2732 | case LTTNG_DOMAIN_KERNEL: | |
2733 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2734 | session->kernel_session); | |
2735 | if (kchan == NULL) { | |
2736 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2737 | ret = channel_kernel_create(session->kernel_session, NULL, |
2738 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2739 | if (ret != LTTCOMM_OK) { |
2740 | goto error; | |
d36b8583 | 2741 | } |
0d0c377a | 2742 | |
8f69e5eb DG |
2743 | /* Get the newly created kernel channel pointer */ |
2744 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2745 | session->kernel_session); | |
2746 | if (kchan == NULL) { | |
2747 | /* This sould not happen... */ | |
2748 | ret = LTTCOMM_FATAL; | |
2749 | goto error; | |
2750 | } | |
2751 | ||
54d01ffb | 2752 | } |
0fdd1e2c | 2753 | |
7a3d1328 | 2754 | switch (event_type) { |
76d45b40 | 2755 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2756 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2757 | kchan, kernel_tracer_fd); |
7a3d1328 | 2758 | break; |
76d45b40 | 2759 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2760 | /* |
7a3d1328 MD |
2761 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2762 | * events already registered to the channel. | |
8c9ae521 | 2763 | */ |
7a3d1328 MD |
2764 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2765 | kchan, kernel_tracer_fd); | |
2766 | break; | |
76d45b40 | 2767 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2768 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2769 | ret = event_kernel_enable_all(session->kernel_session, |
2770 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2771 | break; |
2772 | default: | |
2773 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2774 | goto error; | |
8c9ae521 | 2775 | } |
8f69e5eb DG |
2776 | |
2777 | /* Manage return value */ | |
54d01ffb | 2778 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2779 | goto error; |
d36b8583 DG |
2780 | } |
2781 | ||
54d01ffb | 2782 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2783 | break; |
76d45b40 DG |
2784 | case LTTNG_DOMAIN_UST: |
2785 | { | |
2786 | struct lttng_channel *attr; | |
2787 | struct ltt_ust_channel *uchan; | |
2788 | struct ltt_ust_session *usess = session->ust_session; | |
2789 | ||
2790 | /* Get channel from global UST domain */ | |
2791 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2792 | channel_name); | |
2793 | if (uchan == NULL) { | |
2794 | /* Create default channel */ | |
2795 | attr = channel_new_default_attr(domain); | |
2796 | if (attr == NULL) { | |
2797 | ret = LTTCOMM_FATAL; | |
2798 | goto error; | |
2799 | } | |
2800 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2801 | attr->name[NAME_MAX - 1] = '\0'; | |
2802 | ||
2803 | /* Use the internal command enable channel */ | |
7885e399 | 2804 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2805 | if (ret != LTTCOMM_OK) { |
2806 | free(attr); | |
2807 | goto error; | |
2808 | } | |
2809 | free(attr); | |
2810 | ||
2811 | /* Get the newly created channel reference back */ | |
2812 | uchan = trace_ust_find_channel_by_name( | |
2813 | usess->domain_global.channels, channel_name); | |
2814 | if (uchan == NULL) { | |
2815 | /* Something is really wrong */ | |
2816 | ret = LTTCOMM_FATAL; | |
2817 | goto error; | |
2818 | } | |
2819 | } | |
2820 | ||
2821 | /* At this point, the session and channel exist on the tracer */ | |
2822 | ||
2823 | switch (event_type) { | |
2824 | case LTTNG_EVENT_ALL: | |
2825 | case LTTNG_EVENT_TRACEPOINT: | |
2826 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2827 | if (ret != LTTCOMM_OK) { | |
2828 | goto error; | |
2829 | } | |
2830 | break; | |
2831 | default: | |
2832 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2833 | goto error; | |
2834 | } | |
2835 | ||
2836 | /* Manage return value */ | |
2837 | if (ret != LTTCOMM_OK) { | |
2838 | goto error; | |
2839 | } | |
2840 | ||
2841 | break; | |
2842 | } | |
d78d6610 | 2843 | #if 0 |
76d45b40 DG |
2844 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2845 | case LTTNG_DOMAIN_UST_PID: | |
2846 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2847 | #endif |
54d01ffb | 2848 | default: |
1ab1ea0b | 2849 | ret = LTTCOMM_UND; |
54d01ffb | 2850 | goto error; |
d36b8583 | 2851 | } |
f3ed775e | 2852 | |
54d01ffb DG |
2853 | ret = LTTCOMM_OK; |
2854 | ||
2855 | error: | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | /* | |
2860 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2861 | */ | |
2862 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2863 | { | |
2864 | int ret; | |
2865 | ssize_t nb_events = 0; | |
2866 | ||
2867 | switch (domain) { | |
2868 | case LTTNG_DOMAIN_KERNEL: | |
2869 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2870 | if (nb_events < 0) { | |
2871 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2872 | goto error; | |
894be886 | 2873 | } |
54d01ffb | 2874 | break; |
b551a063 DG |
2875 | case LTTNG_DOMAIN_UST: |
2876 | nb_events = ust_app_list_events(events); | |
2877 | if (nb_events < 0) { | |
2878 | ret = LTTCOMM_UST_LIST_FAIL; | |
2879 | goto error; | |
2880 | } | |
2881 | break; | |
54d01ffb | 2882 | default: |
1ab1ea0b | 2883 | ret = LTTCOMM_UND; |
54d01ffb DG |
2884 | goto error; |
2885 | } | |
894be886 | 2886 | |
54d01ffb | 2887 | return nb_events; |
7d29a247 | 2888 | |
54d01ffb DG |
2889 | error: |
2890 | /* Return negative value to differentiate return code */ | |
2891 | return -ret; | |
2892 | } | |
b389abbe | 2893 | |
54d01ffb DG |
2894 | /* |
2895 | * Command LTTNG_START_TRACE processed by the client thread. | |
2896 | */ | |
2897 | static int cmd_start_trace(struct ltt_session *session) | |
2898 | { | |
2899 | int ret; | |
54d01ffb | 2900 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2901 | struct ltt_ust_session *usess; |
b389abbe | 2902 | |
54d01ffb DG |
2903 | /* Short cut */ |
2904 | ksession = session->kernel_session; | |
b9d9b220 | 2905 | usess = session->ust_session; |
5eb91c98 | 2906 | |
b9ef1c83 | 2907 | if (session->enabled) { |
80e327fa DG |
2908 | /* Already started. */ |
2909 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2910 | goto error; |
2911 | } | |
2912 | ||
464dd62d MD |
2913 | session->enabled = 1; |
2914 | ||
54d01ffb DG |
2915 | /* Kernel tracing */ |
2916 | if (ksession != NULL) { | |
2bdd86d4 MD |
2917 | struct ltt_kernel_channel *kchan; |
2918 | ||
54d01ffb DG |
2919 | /* Open kernel metadata */ |
2920 | if (ksession->metadata == NULL) { | |
2921 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2922 | if (ret < 0) { | |
2923 | ret = LTTCOMM_KERN_META_FAIL; | |
2924 | goto error; | |
b389abbe | 2925 | } |
54d01ffb | 2926 | } |
7d29a247 | 2927 | |
54d01ffb | 2928 | /* Open kernel metadata stream */ |
03550b58 | 2929 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2930 | ret = kernel_open_metadata_stream(ksession); |
2931 | if (ret < 0) { | |
2932 | ERR("Kernel create metadata stream failed"); | |
2933 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2934 | goto error; | |
2935 | } | |
2936 | } | |
2937 | ||
2938 | /* For each channel */ | |
2939 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2940 | if (kchan->stream_count == 0) { | |
2941 | ret = kernel_open_channel_stream(kchan); | |
2942 | if (ret < 0) { | |
2943 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2944 | goto error; |
2945 | } | |
54d01ffb DG |
2946 | /* Update the stream global counter */ |
2947 | ksession->stream_count_global += ret; | |
7d29a247 | 2948 | } |
54d01ffb DG |
2949 | } |
2950 | ||
2951 | /* Setup kernel consumer socket and send fds to it */ | |
2952 | ret = init_kernel_tracing(ksession); | |
2953 | if (ret < 0) { | |
2954 | ret = LTTCOMM_KERN_START_FAIL; | |
2955 | goto error; | |
2956 | } | |
2957 | ||
2958 | /* This start the kernel tracing */ | |
2959 | ret = kernel_start_session(ksession); | |
2960 | if (ret < 0) { | |
2961 | ret = LTTCOMM_KERN_START_FAIL; | |
2962 | goto error; | |
2963 | } | |
2964 | ||
2965 | /* Quiescent wait after starting trace */ | |
2966 | kernel_wait_quiescent(kernel_tracer_fd); | |
2967 | } | |
2968 | ||
36dc12cc | 2969 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2970 | if (usess) { |
2971 | usess->start_trace = 1; | |
36dc12cc | 2972 | |
b9d9b220 DG |
2973 | ret = ust_app_start_trace_all(usess); |
2974 | if (ret < 0) { | |
2975 | ret = LTTCOMM_UST_START_FAIL; | |
2976 | goto error; | |
2977 | } | |
2bdd86d4 | 2978 | } |
54d01ffb DG |
2979 | |
2980 | ret = LTTCOMM_OK; | |
2981 | ||
2982 | error: | |
2983 | return ret; | |
2984 | } | |
2985 | ||
2986 | /* | |
2987 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2988 | */ | |
2989 | static int cmd_stop_trace(struct ltt_session *session) | |
2990 | { | |
2991 | int ret; | |
2992 | struct ltt_kernel_channel *kchan; | |
2993 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2994 | struct ltt_ust_session *usess; |
54d01ffb DG |
2995 | |
2996 | /* Short cut */ | |
2997 | ksession = session->kernel_session; | |
8be98f9a | 2998 | usess = session->ust_session; |
54d01ffb | 2999 | |
b9ef1c83 | 3000 | if (!session->enabled) { |
80e327fa | 3001 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
3002 | goto error; |
3003 | } | |
3004 | ||
464dd62d MD |
3005 | session->enabled = 0; |
3006 | ||
54d01ffb DG |
3007 | /* Kernel tracer */ |
3008 | if (ksession != NULL) { | |
3009 | DBG("Stop kernel tracing"); | |
3010 | ||
3011 | /* Flush all buffers before stopping */ | |
3012 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
3013 | if (ret < 0) { | |
3014 | ERR("Kernel metadata flush failed"); | |
3015 | } | |
f34daff7 | 3016 | |
54d01ffb DG |
3017 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3018 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3019 | if (ret < 0) { |
54d01ffb | 3020 | ERR("Kernel flush buffer error"); |
7d29a247 | 3021 | } |
54d01ffb | 3022 | } |
19e70852 | 3023 | |
54d01ffb DG |
3024 | ret = kernel_stop_session(ksession); |
3025 | if (ret < 0) { | |
3026 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3027 | goto error; |
f3ed775e | 3028 | } |
54d01ffb DG |
3029 | |
3030 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3031 | } |
54d01ffb | 3032 | |
8be98f9a MD |
3033 | if (usess) { |
3034 | usess->start_trace = 0; | |
2bdd86d4 | 3035 | |
8be98f9a | 3036 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3037 | if (ret < 0) { |
190df5ac | 3038 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3039 | goto error; |
3040 | } | |
2bdd86d4 | 3041 | } |
54d01ffb DG |
3042 | |
3043 | ret = LTTCOMM_OK; | |
3044 | ||
3045 | error: | |
3046 | return ret; | |
3047 | } | |
3048 | ||
3049 | /* | |
3050 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3051 | */ | |
730389d9 | 3052 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
3053 | { |
3054 | int ret; | |
3055 | ||
730389d9 DG |
3056 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3057 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
3058 | if (ret != LTTCOMM_OK) { |
3059 | goto error; | |
3060 | } | |
3061 | ||
3062 | ret = LTTCOMM_OK; | |
3063 | ||
3064 | error: | |
3065 | return ret; | |
3066 | } | |
3067 | ||
3068 | /* | |
3069 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3070 | */ | |
3071 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3072 | { | |
3073 | int ret; | |
3074 | ||
3075 | /* Clean kernel session teardown */ | |
3076 | teardown_kernel_session(session); | |
84cd17c6 MD |
3077 | /* UST session teardown */ |
3078 | teardown_ust_session(session); | |
54d01ffb DG |
3079 | |
3080 | /* | |
3081 | * Must notify the kernel thread here to update it's poll setin order | |
3082 | * to remove the channel(s)' fd just destroyed. | |
3083 | */ | |
3084 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3085 | if (ret < 0) { | |
76d7553f | 3086 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3087 | } |
3088 | ||
271933a4 | 3089 | ret = session_destroy(session); |
54d01ffb DG |
3090 | |
3091 | return ret; | |
3092 | } | |
3093 | ||
3094 | /* | |
3095 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3096 | */ | |
3097 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3098 | { | |
3099 | int ret; | |
3100 | ||
3101 | switch (domain) { | |
3102 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3103 | { |
54d01ffb | 3104 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3105 | |
54d01ffb DG |
3106 | kcalibrate.type = calibrate->type; |
3107 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3108 | if (ret < 0) { |
54d01ffb DG |
3109 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3110 | goto error; | |
33a2b854 | 3111 | } |
54d01ffb DG |
3112 | break; |
3113 | } | |
4466912f DG |
3114 | case LTTNG_DOMAIN_UST: |
3115 | { | |
3116 | struct lttng_ust_calibrate ucalibrate; | |
3117 | ||
3118 | ucalibrate.type = calibrate->type; | |
3119 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3120 | if (ret < 0) { | |
3121 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3122 | goto error; | |
3123 | } | |
3124 | break; | |
3125 | } | |
54d01ffb | 3126 | default: |
1ab1ea0b | 3127 | ret = LTTCOMM_UND; |
54d01ffb DG |
3128 | goto error; |
3129 | } | |
33a2b854 | 3130 | |
54d01ffb | 3131 | ret = LTTCOMM_OK; |
33a2b854 | 3132 | |
54d01ffb DG |
3133 | error: |
3134 | return ret; | |
3135 | } | |
7d29a247 | 3136 | |
54d01ffb DG |
3137 | /* |
3138 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3139 | */ | |
3140 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3141 | char *sock_path) | |
3142 | { | |
3143 | int ret, sock; | |
b389abbe | 3144 | |
54d01ffb DG |
3145 | switch (domain) { |
3146 | case LTTNG_DOMAIN_KERNEL: | |
3147 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3148 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3149 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3150 | goto error; | |
3151 | } | |
3152 | ||
3153 | sock = lttcomm_connect_unix_sock(sock_path); | |
3154 | if (sock < 0) { | |
3155 | ret = LTTCOMM_CONNECT_FAIL; | |
3156 | goto error; | |
3157 | } | |
3158 | ||
3159 | session->kernel_session->consumer_fd = sock; | |
3160 | break; | |
3161 | default: | |
3162 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3163 | ret = LTTCOMM_UND; |
54d01ffb DG |
3164 | goto error; |
3165 | } | |
3166 | ||
3167 | ret = LTTCOMM_OK; | |
3168 | ||
3169 | error: | |
3170 | return ret; | |
3171 | } | |
3172 | ||
3173 | /* | |
3174 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3175 | */ | |
3176 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3177 | struct lttng_domain **domains) | |
3178 | { | |
b551a063 | 3179 | int ret, index = 0; |
54d01ffb DG |
3180 | ssize_t nb_dom = 0; |
3181 | ||
3182 | if (session->kernel_session != NULL) { | |
b551a063 | 3183 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3184 | nb_dom++; |
3185 | } | |
3186 | ||
b551a063 DG |
3187 | if (session->ust_session != NULL) { |
3188 | DBG3("Listing domains found UST global domain"); | |
3189 | nb_dom++; | |
3190 | } | |
54d01ffb | 3191 | |
b551a063 | 3192 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3193 | if (*domains == NULL) { |
3194 | ret = -LTTCOMM_FATAL; | |
3195 | goto error; | |
3196 | } | |
3197 | ||
b551a063 DG |
3198 | if (session->kernel_session != NULL) { |
3199 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3200 | index++; | |
3201 | } | |
3202 | ||
3203 | if (session->ust_session != NULL) { | |
3204 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3205 | index++; | |
3206 | } | |
54d01ffb | 3207 | |
54d01ffb DG |
3208 | return nb_dom; |
3209 | ||
3210 | error: | |
3211 | return ret; | |
3212 | } | |
3213 | ||
3214 | /* | |
3215 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3216 | */ | |
b551a063 | 3217 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3218 | struct lttng_channel **channels) |
3219 | { | |
3220 | int ret; | |
3221 | ssize_t nb_chan = 0; | |
3222 | ||
b551a063 DG |
3223 | switch (domain) { |
3224 | case LTTNG_DOMAIN_KERNEL: | |
3225 | if (session->kernel_session != NULL) { | |
3226 | nb_chan = session->kernel_session->channel_count; | |
3227 | } | |
0df502fd | 3228 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3229 | break; |
3230 | case LTTNG_DOMAIN_UST: | |
3231 | if (session->ust_session != NULL) { | |
bec39940 | 3232 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3233 | session->ust_session->domain_global.channels); |
3234 | } | |
0df502fd | 3235 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3236 | break; |
3237 | default: | |
3238 | *channels = NULL; | |
1ab1ea0b | 3239 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3240 | goto error; |
3241 | } | |
3242 | ||
b551a063 DG |
3243 | if (nb_chan > 0) { |
3244 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3245 | if (*channels == NULL) { | |
3246 | ret = -LTTCOMM_FATAL; | |
3247 | goto error; | |
3248 | } | |
54d01ffb | 3249 | |
b551a063 DG |
3250 | list_lttng_channels(domain, session, *channels); |
3251 | } else { | |
3252 | *channels = NULL; | |
3253 | } | |
2bdd86d4 | 3254 | |
54d01ffb DG |
3255 | return nb_chan; |
3256 | ||
3257 | error: | |
3258 | return ret; | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3263 | */ | |
b551a063 | 3264 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3265 | char *channel_name, struct lttng_event **events) |
3266 | { | |
b551a063 | 3267 | int ret = 0; |
54d01ffb | 3268 | ssize_t nb_event = 0; |
54d01ffb | 3269 | |
b551a063 DG |
3270 | switch (domain) { |
3271 | case LTTNG_DOMAIN_KERNEL: | |
3272 | if (session->kernel_session != NULL) { | |
3273 | nb_event = list_lttng_kernel_events(channel_name, | |
3274 | session->kernel_session, events); | |
54d01ffb | 3275 | } |
b551a063 DG |
3276 | break; |
3277 | case LTTNG_DOMAIN_UST: | |
3278 | { | |
3279 | if (session->ust_session != NULL) { | |
3280 | nb_event = list_lttng_ust_global_events(channel_name, | |
3281 | &session->ust_session->domain_global, events); | |
3282 | } | |
3283 | break; | |
54d01ffb | 3284 | } |
b551a063 | 3285 | default: |
1ab1ea0b | 3286 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3287 | goto error; |
3288 | } | |
3289 | ||
b551a063 | 3290 | ret = nb_event; |
54d01ffb DG |
3291 | |
3292 | error: | |
3293 | return ret; | |
3294 | } | |
3295 | ||
3296 | /* | |
3297 | * Process the command requested by the lttng client within the command | |
3298 | * context structure. This function make sure that the return structure (llm) | |
3299 | * is set and ready for transmission before returning. | |
3300 | * | |
3301 | * Return any error encountered or 0 for success. | |
3302 | */ | |
3303 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3304 | { | |
3305 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3306 | int need_tracing_session = 1; |
2e09ba09 | 3307 | int need_domain; |
54d01ffb DG |
3308 | |
3309 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3310 | ||
2e09ba09 MD |
3311 | switch (cmd_ctx->lsm->cmd_type) { |
3312 | case LTTNG_CREATE_SESSION: | |
3313 | case LTTNG_DESTROY_SESSION: | |
3314 | case LTTNG_LIST_SESSIONS: | |
3315 | case LTTNG_LIST_DOMAINS: | |
3316 | case LTTNG_START_TRACE: | |
3317 | case LTTNG_STOP_TRACE: | |
3318 | need_domain = 0; | |
3aace903 | 3319 | break; |
2e09ba09 MD |
3320 | default: |
3321 | need_domain = 1; | |
3322 | } | |
3323 | ||
3324 | if (opt_no_kernel && need_domain | |
3325 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3326 | if (!is_root) { |
3327 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3328 | } else { | |
3329 | ret = LTTCOMM_KERN_NA; | |
3330 | } | |
4fba7219 DG |
3331 | goto error; |
3332 | } | |
3333 | ||
54d01ffb DG |
3334 | /* |
3335 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3336 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3337 | * command. |
3338 | */ | |
3339 | switch(cmd_ctx->lsm->cmd_type) { | |
3340 | case LTTNG_LIST_SESSIONS: | |
3341 | case LTTNG_LIST_TRACEPOINTS: | |
3342 | case LTTNG_LIST_DOMAINS: | |
3343 | case LTTNG_LIST_CHANNELS: | |
3344 | case LTTNG_LIST_EVENTS: | |
3345 | break; | |
3346 | default: | |
3347 | /* Setup lttng message with no payload */ | |
3348 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3349 | if (ret < 0) { | |
3350 | /* This label does not try to unlock the session */ | |
3351 | goto init_setup_error; | |
3352 | } | |
3353 | } | |
3354 | ||
3355 | /* Commands that DO NOT need a session. */ | |
3356 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3357 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3358 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3359 | case LTTNG_LIST_SESSIONS: |
3360 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3361 | need_tracing_session = 0; |
54d01ffb DG |
3362 | break; |
3363 | default: | |
3364 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3365 | /* |
3366 | * We keep the session list lock across _all_ commands | |
3367 | * for now, because the per-session lock does not | |
3368 | * handle teardown properly. | |
3369 | */ | |
74babd95 | 3370 | session_lock_list(); |
54d01ffb DG |
3371 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3372 | if (cmd_ctx->session == NULL) { | |
3373 | if (cmd_ctx->lsm->session.name != NULL) { | |
3374 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3375 | } else { | |
3376 | /* If no session name specified */ | |
3377 | ret = LTTCOMM_SELECT_SESS; | |
3378 | } | |
3379 | goto error; | |
3380 | } else { | |
3381 | /* Acquire lock for the session */ | |
3382 | session_lock(cmd_ctx->session); | |
3383 | } | |
3384 | break; | |
3385 | } | |
b389abbe | 3386 | |
2e09ba09 MD |
3387 | if (!need_domain) { |
3388 | goto skip_domain; | |
3389 | } | |
54d01ffb DG |
3390 | /* |
3391 | * Check domain type for specific "pre-action". | |
3392 | */ | |
3393 | switch (cmd_ctx->lsm->domain.type) { | |
3394 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3395 | if (!is_root) { |
531d29f9 | 3396 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3397 | goto error; |
3398 | } | |
3399 | ||
54d01ffb | 3400 | /* Kernel tracer check */ |
a4b35e07 | 3401 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3402 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3403 | ret = init_kernel_tracer(); |
3404 | if (ret != 0) { | |
54d01ffb DG |
3405 | goto error; |
3406 | } | |
3407 | } | |
5eb91c98 | 3408 | |
f22d70f0 DG |
3409 | /* Consumer is in an ERROR state. Report back to client */ |
3410 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
3411 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3412 | goto error; | |
3413 | } | |
3414 | ||
54d01ffb | 3415 | /* Need a session for kernel command */ |
44d3bd01 | 3416 | if (need_tracing_session) { |
54d01ffb | 3417 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3418 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3419 | if (ret < 0) { |
54d01ffb | 3420 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3421 | goto error; |
3422 | } | |
b389abbe | 3423 | } |
7d29a247 | 3424 | |
54d01ffb | 3425 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3426 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3427 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3428 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3429 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3430 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3431 | if (ret < 0) { |
54d01ffb DG |
3432 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3433 | goto error; | |
950131af | 3434 | } |
f22d70f0 | 3435 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3436 | } else { |
3437 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3438 | } |
0d0c377a | 3439 | } |
f22d70f0 | 3440 | |
54d01ffb | 3441 | break; |
2bdd86d4 | 3442 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3443 | { |
f22d70f0 DG |
3444 | /* Consumer is in an ERROR state. Report back to client */ |
3445 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
3446 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3447 | goto error; | |
3448 | } | |
3449 | ||
44d3bd01 | 3450 | if (need_tracing_session) { |
f6a9efaa | 3451 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3452 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3453 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3454 | if (ret != LTTCOMM_OK) { |
3455 | goto error; | |
3456 | } | |
3457 | } | |
7753dea8 MD |
3458 | /* Start the UST consumer daemons */ |
3459 | /* 64-bit */ | |
3460 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3461 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3462 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3463 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3464 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3465 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3466 | if (ret < 0) { |
7753dea8 MD |
3467 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3468 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3469 | goto error; |
3470 | } | |
48842b30 | 3471 | |
7753dea8 | 3472 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
f22d70f0 | 3473 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3474 | } else { |
7753dea8 MD |
3475 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3476 | } | |
3477 | /* 32-bit */ | |
fc7a59ce | 3478 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3479 | ustconsumer32_data.pid == 0 && |
3480 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3481 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3482 | ret = start_consumerd(&ustconsumer32_data); | |
3483 | if (ret < 0) { | |
3484 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3485 | ust_consumerd32_fd = -EINVAL; | |
3486 | goto error; | |
3487 | } | |
f22d70f0 | 3488 | |
7753dea8 | 3489 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
f22d70f0 | 3490 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3491 | } else { |
3492 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3493 | } |
44d3bd01 DG |
3494 | } |
3495 | break; | |
48842b30 | 3496 | } |
54d01ffb | 3497 | default: |
54d01ffb DG |
3498 | break; |
3499 | } | |
2e09ba09 | 3500 | skip_domain: |
33a2b854 | 3501 | |
f22d70f0 DG |
3502 | /* Validate consumer daemon state when start/stop trace command */ |
3503 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3504 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3505 | switch (cmd_ctx->lsm->domain.type) { | |
3506 | case LTTNG_DOMAIN_UST: | |
3507 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
3508 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3509 | goto error; | |
3510 | } | |
3511 | break; | |
3512 | case LTTNG_DOMAIN_KERNEL: | |
3513 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
3514 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3515 | goto error; | |
3516 | } | |
3517 | break; | |
3518 | } | |
3519 | } | |
3520 | ||
8e0af1b4 MD |
3521 | /* |
3522 | * Check that the UID or GID match that of the tracing session. | |
3523 | * The root user can interact with all sessions. | |
3524 | */ | |
3525 | if (need_tracing_session) { | |
3526 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3527 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3528 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3529 | ret = LTTCOMM_EPERM; |
3530 | goto error; | |
3531 | } | |
3532 | } | |
3533 | ||
54d01ffb DG |
3534 | /* Process by command type */ |
3535 | switch (cmd_ctx->lsm->cmd_type) { | |
3536 | case LTTNG_ADD_CONTEXT: | |
3537 | { | |
3538 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3539 | cmd_ctx->lsm->u.context.channel_name, | |
3540 | cmd_ctx->lsm->u.context.event_name, | |
3541 | &cmd_ctx->lsm->u.context.ctx); | |
3542 | break; | |
3543 | } | |
3544 | case LTTNG_DISABLE_CHANNEL: | |
3545 | { | |
3546 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3547 | cmd_ctx->lsm->u.disable.channel_name); | |
3548 | break; | |
3549 | } | |
3550 | case LTTNG_DISABLE_EVENT: | |
3551 | { | |
3552 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3553 | cmd_ctx->lsm->u.disable.channel_name, | |
3554 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3555 | break; |
3556 | } | |
54d01ffb DG |
3557 | case LTTNG_DISABLE_ALL_EVENT: |
3558 | { | |
2bdd86d4 | 3559 | DBG("Disabling all events"); |
54d01ffb DG |
3560 | |
3561 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3562 | cmd_ctx->lsm->u.disable.channel_name); | |
3563 | break; | |
3564 | } | |
3565 | case LTTNG_ENABLE_CHANNEL: | |
3566 | { | |
aea829b3 | 3567 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3568 | &cmd_ctx->lsm->u.channel.chan); |
3569 | break; | |
3570 | } | |
3571 | case LTTNG_ENABLE_EVENT: | |
3572 | { | |
3573 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3574 | cmd_ctx->lsm->u.enable.channel_name, | |
3575 | &cmd_ctx->lsm->u.enable.event); | |
3576 | break; | |
3577 | } | |
3578 | case LTTNG_ENABLE_ALL_EVENT: | |
3579 | { | |
2bdd86d4 | 3580 | DBG("Enabling all events"); |
54d01ffb DG |
3581 | |
3582 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3583 | cmd_ctx->lsm->u.enable.channel_name, |
3584 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3585 | break; |
3586 | } | |
052da939 | 3587 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3588 | { |
9f19cc17 | 3589 | struct lttng_event *events; |
54d01ffb | 3590 | ssize_t nb_events; |
052da939 | 3591 | |
54d01ffb DG |
3592 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3593 | if (nb_events < 0) { | |
3594 | ret = -nb_events; | |
3595 | goto error; | |
2ef84c95 DG |
3596 | } |
3597 | ||
3598 | /* | |
3599 | * Setup lttng message with payload size set to the event list size in | |
3600 | * bytes and then copy list into the llm payload. | |
3601 | */ | |
052da939 | 3602 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3603 | if (ret < 0) { |
052da939 | 3604 | free(events); |
2ef84c95 DG |
3605 | goto setup_error; |
3606 | } | |
3607 | ||
3608 | /* Copy event list into message payload */ | |
9f19cc17 | 3609 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3610 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3611 | |
9f19cc17 | 3612 | free(events); |
2ef84c95 DG |
3613 | |
3614 | ret = LTTCOMM_OK; | |
3615 | break; | |
3616 | } | |
f3ed775e | 3617 | case LTTNG_START_TRACE: |
8c0faa1d | 3618 | { |
54d01ffb | 3619 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3620 | break; |
3621 | } | |
f3ed775e | 3622 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3623 | { |
54d01ffb | 3624 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3625 | break; |
3626 | } | |
5e16da05 MD |
3627 | case LTTNG_CREATE_SESSION: |
3628 | { | |
54d01ffb | 3629 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3630 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3631 | break; |
3632 | } | |
3633 | case LTTNG_DESTROY_SESSION: | |
3634 | { | |
54d01ffb DG |
3635 | ret = cmd_destroy_session(cmd_ctx->session, |
3636 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
3637 | /* |
3638 | * Set session to NULL so we do not unlock it after | |
3639 | * free. | |
3640 | */ | |
3641 | cmd_ctx->session = NULL; | |
5461b305 | 3642 | break; |
5e16da05 | 3643 | } |
9f19cc17 | 3644 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3645 | { |
54d01ffb DG |
3646 | ssize_t nb_dom; |
3647 | struct lttng_domain *domains; | |
5461b305 | 3648 | |
54d01ffb DG |
3649 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3650 | if (nb_dom < 0) { | |
3651 | ret = -nb_dom; | |
3652 | goto error; | |
ce3d728c | 3653 | } |
520ff687 | 3654 | |
54d01ffb | 3655 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3656 | if (ret < 0) { |
3657 | goto setup_error; | |
520ff687 | 3658 | } |
57167058 | 3659 | |
54d01ffb DG |
3660 | /* Copy event list into message payload */ |
3661 | memcpy(cmd_ctx->llm->payload, domains, | |
3662 | nb_dom * sizeof(struct lttng_domain)); | |
3663 | ||
3664 | free(domains); | |
5e16da05 | 3665 | |
5461b305 | 3666 | ret = LTTCOMM_OK; |
5e16da05 MD |
3667 | break; |
3668 | } | |
9f19cc17 | 3669 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3670 | { |
54d01ffb DG |
3671 | size_t nb_chan; |
3672 | struct lttng_channel *channels; | |
3673 | ||
b551a063 DG |
3674 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3675 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3676 | if (nb_chan < 0) { |
3677 | ret = -nb_chan; | |
3678 | goto error; | |
5461b305 | 3679 | } |
ca95a216 | 3680 | |
54d01ffb | 3681 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3682 | if (ret < 0) { |
3683 | goto setup_error; | |
3684 | } | |
9f19cc17 | 3685 | |
54d01ffb DG |
3686 | /* Copy event list into message payload */ |
3687 | memcpy(cmd_ctx->llm->payload, channels, | |
3688 | nb_chan * sizeof(struct lttng_channel)); | |
3689 | ||
3690 | free(channels); | |
9f19cc17 DG |
3691 | |
3692 | ret = LTTCOMM_OK; | |
5461b305 | 3693 | break; |
5e16da05 | 3694 | } |
9f19cc17 | 3695 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3696 | { |
b551a063 | 3697 | ssize_t nb_event; |
684d34d2 | 3698 | struct lttng_event *events = NULL; |
9f19cc17 | 3699 | |
b551a063 | 3700 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3701 | cmd_ctx->lsm->u.list.channel_name, &events); |
3702 | if (nb_event < 0) { | |
3703 | ret = -nb_event; | |
3704 | goto error; | |
5461b305 | 3705 | } |
ca95a216 | 3706 | |
54d01ffb | 3707 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3708 | if (ret < 0) { |
3709 | goto setup_error; | |
3710 | } | |
9f19cc17 | 3711 | |
54d01ffb DG |
3712 | /* Copy event list into message payload */ |
3713 | memcpy(cmd_ctx->llm->payload, events, | |
3714 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3715 | |
54d01ffb | 3716 | free(events); |
9f19cc17 DG |
3717 | |
3718 | ret = LTTCOMM_OK; | |
5461b305 | 3719 | break; |
5e16da05 MD |
3720 | } |
3721 | case LTTNG_LIST_SESSIONS: | |
3722 | { | |
8e0af1b4 | 3723 | unsigned int nr_sessions; |
5461b305 | 3724 | |
8e0af1b4 | 3725 | session_lock_list(); |
730389d9 DG |
3726 | nr_sessions = lttng_sessions_count( |
3727 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3728 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3729 | |
8e0af1b4 | 3730 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3731 | if (ret < 0) { |
54d01ffb | 3732 | session_unlock_list(); |
5461b305 | 3733 | goto setup_error; |
e065084a | 3734 | } |
5e16da05 | 3735 | |
6c9cc2ab | 3736 | /* Filled the session array */ |
8e0af1b4 | 3737 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3738 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3739 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3740 | |
54d01ffb | 3741 | session_unlock_list(); |
5e16da05 | 3742 | |
5461b305 | 3743 | ret = LTTCOMM_OK; |
5e16da05 MD |
3744 | break; |
3745 | } | |
d0254c7c MD |
3746 | case LTTNG_CALIBRATE: |
3747 | { | |
54d01ffb DG |
3748 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3749 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3750 | break; |
3751 | } | |
d9800920 DG |
3752 | case LTTNG_REGISTER_CONSUMER: |
3753 | { | |
54d01ffb DG |
3754 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3755 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3756 | break; |
3757 | } | |
5e16da05 | 3758 | default: |
5e16da05 | 3759 | ret = LTTCOMM_UND; |
5461b305 | 3760 | break; |
fac6795d DG |
3761 | } |
3762 | ||
5461b305 | 3763 | error: |
5461b305 DG |
3764 | if (cmd_ctx->llm == NULL) { |
3765 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3766 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3767 | goto setup_error; |
3768 | } | |
3769 | } | |
54d01ffb | 3770 | /* Set return code */ |
5461b305 | 3771 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3772 | setup_error: |
b5541356 | 3773 | if (cmd_ctx->session) { |
54d01ffb | 3774 | session_unlock(cmd_ctx->session); |
b5541356 | 3775 | } |
256a5576 MD |
3776 | if (need_tracing_session) { |
3777 | session_unlock_list(); | |
3778 | } | |
54d01ffb | 3779 | init_setup_error: |
8028d920 | 3780 | return ret; |
fac6795d DG |
3781 | } |
3782 | ||
1d4b027a | 3783 | /* |
d063d709 DG |
3784 | * This thread manage all clients request using the unix client socket for |
3785 | * communication. | |
1d4b027a DG |
3786 | */ |
3787 | static void *thread_manage_clients(void *data) | |
3788 | { | |
a4b35e07 | 3789 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3790 | uint32_t revents, nb_fd; |
273ea72c | 3791 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3792 | struct lttng_poll_event events; |
1d4b027a DG |
3793 | |
3794 | DBG("[thread] Manage client started"); | |
3795 | ||
f6a9efaa DG |
3796 | rcu_register_thread(); |
3797 | ||
1d4b027a DG |
3798 | ret = lttcomm_listen_unix_sock(client_sock); |
3799 | if (ret < 0) { | |
3800 | goto error; | |
3801 | } | |
3802 | ||
5eb91c98 DG |
3803 | /* |
3804 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3805 | * more will be added to this poll set. | |
3806 | */ | |
3807 | ret = create_thread_poll_set(&events, 2); | |
3808 | if (ret < 0) { | |
3809 | goto error; | |
3810 | } | |
273ea72c | 3811 | |
5eb91c98 DG |
3812 | /* Add the application registration socket */ |
3813 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3814 | if (ret < 0) { | |
3815 | goto error; | |
3816 | } | |
273ea72c | 3817 | |
bbd973c2 DG |
3818 | /* |
3819 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3820 | */ |
3821 | if (opt_sig_parent) { | |
8db8d1dc | 3822 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3823 | } |
3824 | ||
3825 | while (1) { | |
1d4b027a | 3826 | DBG("Accepting client command ..."); |
273ea72c | 3827 | |
5eb91c98 DG |
3828 | nb_fd = LTTNG_POLL_GETNB(&events); |
3829 | ||
273ea72c | 3830 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3831 | restart: |
5eb91c98 | 3832 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3833 | if (ret < 0) { |
88f2b785 MD |
3834 | /* |
3835 | * Restart interrupted system call. | |
3836 | */ | |
3837 | if (errno == EINTR) { | |
3838 | goto restart; | |
3839 | } | |
273ea72c DG |
3840 | goto error; |
3841 | } | |
3842 | ||
5eb91c98 DG |
3843 | for (i = 0; i < nb_fd; i++) { |
3844 | /* Fetch once the poll data */ | |
3845 | revents = LTTNG_POLL_GETEV(&events, i); | |
3846 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3847 | ||
3848 | /* Thread quit pipe has been closed. Killing thread. */ | |
3849 | ret = check_thread_quit_pipe(pollfd, revents); | |
3850 | if (ret) { | |
3851 | goto error; | |
3852 | } | |
3853 | ||
3854 | /* Event on the registration socket */ | |
3855 | if (pollfd == client_sock) { | |
3856 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3857 | ERR("Client socket poll error"); | |
3858 | goto error; | |
3859 | } | |
3860 | } | |
3861 | } | |
3862 | ||
3863 | DBG("Wait for client response"); | |
3864 | ||
3865 | sock = lttcomm_accept_unix_sock(client_sock); | |
3866 | if (sock < 0) { | |
273ea72c | 3867 | goto error; |
273ea72c DG |
3868 | } |
3869 | ||
be040666 DG |
3870 | /* Set socket option for credentials retrieval */ |
3871 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3872 | if (ret < 0) { | |
3873 | goto error; | |
3874 | } | |
3875 | ||
5eb91c98 | 3876 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3877 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3878 | if (cmd_ctx == NULL) { |
76d7553f | 3879 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3880 | goto error; |
5eb91c98 | 3881 | } |
1d4b027a | 3882 | |
5eb91c98 | 3883 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3884 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3885 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3886 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3887 | goto error; |
3888 | } | |
1d4b027a | 3889 | |
5eb91c98 DG |
3890 | cmd_ctx->llm = NULL; |
3891 | cmd_ctx->session = NULL; | |
1d4b027a | 3892 | |
5eb91c98 DG |
3893 | /* |
3894 | * Data is received from the lttng client. The struct | |
3895 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3896 | * the client. | |
3897 | */ | |
3898 | DBG("Receiving data from client ..."); | |
be040666 DG |
3899 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3900 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3901 | if (ret <= 0) { |
3902 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3903 | ret = close(sock); |
3904 | if (ret) { | |
3905 | PERROR("close"); | |
3906 | } | |
3907 | sock = -1; | |
a2c0da86 | 3908 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3909 | continue; |
3910 | } | |
1d4b027a | 3911 | |
5eb91c98 DG |
3912 | // TODO: Validate cmd_ctx including sanity check for |
3913 | // security purpose. | |
f7776ea7 | 3914 | |
f6a9efaa | 3915 | rcu_thread_online(); |
5eb91c98 DG |
3916 | /* |
3917 | * This function dispatch the work to the kernel or userspace tracer | |
3918 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3919 | * informations for the client. The command context struct contains | |
3920 | * everything this function may needs. | |
3921 | */ | |
3922 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3923 | rcu_thread_offline(); |
5eb91c98 | 3924 | if (ret < 0) { |
bbd973c2 | 3925 | /* |
5eb91c98 | 3926 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3927 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3928 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3929 | */ |
bbd973c2 | 3930 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3931 | continue; |
3932 | } | |
d6e4fca4 | 3933 | |
54d01ffb DG |
3934 | DBG("Sending response (size: %d, retcode: %s)", |
3935 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3936 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3937 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3938 | if (ret < 0) { |
3939 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3940 | } |
1d4b027a | 3941 | |
5eb91c98 | 3942 | /* End of transmission */ |
76d7553f MD |
3943 | ret = close(sock); |
3944 | if (ret) { | |
3945 | PERROR("close"); | |
3946 | } | |
3947 | sock = -1; | |
be040666 DG |
3948 | |
3949 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3950 | } |
3951 | ||
5eb91c98 DG |
3952 | error: |
3953 | DBG("Client thread dying"); | |
273ea72c | 3954 | unlink(client_unix_sock_path); |
76d7553f MD |
3955 | if (client_sock >= 0) { |
3956 | ret = close(client_sock); | |
3957 | if (ret) { | |
3958 | PERROR("close"); | |
3959 | } | |
a4b35e07 MD |
3960 | } |
3961 | if (sock >= 0) { | |
76d7553f MD |
3962 | ret = close(sock); |
3963 | if (ret) { | |
3964 | PERROR("close"); | |
3965 | } | |
a4b35e07 | 3966 | } |
273ea72c | 3967 | |
5eb91c98 | 3968 | lttng_poll_clean(&events); |
a2fb29a5 | 3969 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3970 | |
3971 | rcu_unregister_thread(); | |
1d4b027a DG |
3972 | return NULL; |
3973 | } | |
3974 | ||
3975 | ||
fac6795d DG |
3976 | /* |
3977 | * usage function on stderr | |
3978 | */ | |
3979 | static void usage(void) | |
3980 | { | |
b716ce68 | 3981 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3982 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3983 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3984 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3985 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3986 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3987 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3988 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3989 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3990 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3991 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3992 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3993 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3994 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3995 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3996 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3997 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3998 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3999 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
4000 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 4001 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4002 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
4003 | } |
4004 | ||
4005 | /* | |
4006 | * daemon argument parsing | |
4007 | */ | |
4008 | static int parse_args(int argc, char **argv) | |
4009 | { | |
4010 | int c; | |
4011 | ||
4012 | static struct option long_options[] = { | |
4013 | { "client-sock", 1, 0, 'c' }, | |
4014 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
4015 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
4016 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
4017 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
4018 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
4019 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
4020 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
4021 | { "consumerd32-path", 1, 0, 'u' }, | |
4022 | { "consumerd32-libdir", 1, 0, 'U' }, | |
4023 | { "consumerd64-path", 1, 0, 't' }, | |
4024 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 4025 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 4026 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
4027 | { "help", 0, 0, 'h' }, |
4028 | { "group", 1, 0, 'g' }, | |
4029 | { "version", 0, 0, 'V' }, | |
75462a81 | 4030 | { "quiet", 0, 0, 'q' }, |
3f9947db | 4031 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 4032 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 4033 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
4034 | { NULL, 0, 0, 0 } |
4035 | }; | |
4036 | ||
4037 | while (1) { | |
4038 | int option_index = 0; | |
4fba7219 | 4039 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 4040 | long_options, &option_index); |
fac6795d DG |
4041 | if (c == -1) { |
4042 | break; | |
4043 | } | |
4044 | ||
4045 | switch (c) { | |
4046 | case 0: | |
4047 | fprintf(stderr, "option %s", long_options[option_index].name); | |
4048 | if (optarg) { | |
4049 | fprintf(stderr, " with arg %s\n", optarg); | |
4050 | } | |
4051 | break; | |
b716ce68 | 4052 | case 'c': |
fac6795d DG |
4053 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
4054 | break; | |
4055 | case 'a': | |
4056 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
4057 | break; | |
4058 | case 'd': | |
4059 | opt_daemon = 1; | |
4060 | break; | |
4061 | case 'g': | |
fb09408a | 4062 | opt_tracing_group = optarg; |
fac6795d DG |
4063 | break; |
4064 | case 'h': | |
4065 | usage(); | |
4066 | exit(EXIT_FAILURE); | |
4067 | case 'V': | |
4068 | fprintf(stdout, "%s\n", VERSION); | |
4069 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
4070 | case 'S': |
4071 | opt_sig_parent = 1; | |
4072 | break; | |
d6f42150 | 4073 | case 'E': |
3bd1e081 | 4074 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
4075 | break; |
4076 | case 'C': | |
3bd1e081 MD |
4077 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4078 | break; | |
4079 | case 'F': | |
7753dea8 | 4080 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4081 | break; |
4082 | case 'D': | |
7753dea8 MD |
4083 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4084 | break; | |
4085 | case 'H': | |
4086 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4087 | break; | |
4088 | case 'G': | |
4089 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4090 | break; |
4fba7219 DG |
4091 | case 'N': |
4092 | opt_no_kernel = 1; | |
4093 | break; | |
75462a81 | 4094 | case 'q': |
97e19046 | 4095 | lttng_opt_quiet = 1; |
75462a81 | 4096 | break; |
3f9947db | 4097 | case 'v': |
53086306 | 4098 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4099 | lttng_opt_verbose += 1; |
3f9947db | 4100 | break; |
31f73cc9 | 4101 | case 'Z': |
3bd1e081 | 4102 | opt_verbose_consumer += 1; |
31f73cc9 | 4103 | break; |
fb09408a | 4104 | case 'u': |
fc7a59ce | 4105 | consumerd32_bin= optarg; |
ebaeda94 MD |
4106 | break; |
4107 | case 'U': | |
4108 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4109 | break; |
4110 | case 't': | |
fc7a59ce | 4111 | consumerd64_bin = optarg; |
ebaeda94 MD |
4112 | break; |
4113 | case 'T': | |
4114 | consumerd64_libdir = optarg; | |
fb09408a | 4115 | break; |
fac6795d DG |
4116 | default: |
4117 | /* Unknown option or other error. | |
4118 | * Error is printed by getopt, just return */ | |
4119 | return -1; | |
4120 | } | |
4121 | } | |
4122 | ||
4123 | return 0; | |
4124 | } | |
4125 | ||
4126 | /* | |
d063d709 | 4127 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4128 | * apps_sock - The communication socket for all UST apps. |
4129 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4130 | */ |
cf3af59e | 4131 | static int init_daemon_socket(void) |
fac6795d DG |
4132 | { |
4133 | int ret = 0; | |
4134 | mode_t old_umask; | |
4135 | ||
4136 | old_umask = umask(0); | |
4137 | ||
4138 | /* Create client tool unix socket */ | |
d6f42150 DG |
4139 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4140 | if (client_sock < 0) { | |
4141 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4142 | ret = -1; |
4143 | goto end; | |
4144 | } | |
4145 | ||
4146 | /* File permission MUST be 660 */ | |
4147 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4148 | if (ret < 0) { | |
d6f42150 | 4149 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4150 | PERROR("chmod"); |
fac6795d DG |
4151 | goto end; |
4152 | } | |
4153 | ||
4154 | /* Create the application unix socket */ | |
d6f42150 DG |
4155 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4156 | if (apps_sock < 0) { | |
4157 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4158 | ret = -1; |
4159 | goto end; | |
4160 | } | |
4161 | ||
d6f42150 | 4162 | /* File permission MUST be 666 */ |
54d01ffb DG |
4163 | ret = chmod(apps_unix_sock_path, |
4164 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4165 | if (ret < 0) { |
d6f42150 | 4166 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4167 | PERROR("chmod"); |
fac6795d DG |
4168 | goto end; |
4169 | } | |
4170 | ||
4171 | end: | |
4172 | umask(old_umask); | |
4173 | return ret; | |
4174 | } | |
4175 | ||
4176 | /* | |
54d01ffb DG |
4177 | * Check if the global socket is available, and if a daemon is answering at the |
4178 | * other side. If yes, error is returned. | |
fac6795d | 4179 | */ |
cf3af59e | 4180 | static int check_existing_daemon(void) |
fac6795d | 4181 | { |
7d8234d9 | 4182 | /* Is there anybody out there ? */ |
099e26bd | 4183 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4184 | return -EEXIST; |
099e26bd | 4185 | } |
b09c7c76 DG |
4186 | |
4187 | return 0; | |
fac6795d DG |
4188 | } |
4189 | ||
fac6795d | 4190 | /* |
d063d709 | 4191 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4192 | * |
d063d709 | 4193 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4194 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4195 | */ |
be040666 | 4196 | static int set_permissions(char *rundir) |
fac6795d DG |
4197 | { |
4198 | int ret; | |
996b65c8 | 4199 | gid_t gid; |
fac6795d | 4200 | |
996b65c8 MD |
4201 | gid = allowed_group(); |
4202 | if (gid < 0) { | |
be040666 DG |
4203 | WARN("No tracing group detected"); |
4204 | ret = 0; | |
fac6795d DG |
4205 | goto end; |
4206 | } | |
4207 | ||
d6f42150 | 4208 | /* Set lttng run dir */ |
be040666 | 4209 | ret = chown(rundir, 0, gid); |
d6f42150 | 4210 | if (ret < 0) { |
be040666 | 4211 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4212 | PERROR("chown"); |
d6f42150 DG |
4213 | } |
4214 | ||
d1613cf5 | 4215 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4216 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4217 | if (ret < 0) { |
4218 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4219 | PERROR("chmod"); |
d1613cf5 JN |
4220 | } |
4221 | ||
d6f42150 | 4222 | /* lttng client socket path */ |
996b65c8 | 4223 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4224 | if (ret < 0) { |
d6f42150 | 4225 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4226 | PERROR("chown"); |
d6f42150 DG |
4227 | } |
4228 | ||
3bd1e081 MD |
4229 | /* kconsumer error socket path */ |
4230 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4231 | if (ret < 0) { |
3bd1e081 | 4232 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4233 | PERROR("chown"); |
3bd1e081 MD |
4234 | } |
4235 | ||
7753dea8 MD |
4236 | /* 64-bit ustconsumer error socket path */ |
4237 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4238 | if (ret < 0) { | |
4239 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4240 | PERROR("chown"); |
7753dea8 MD |
4241 | } |
4242 | ||
4243 | /* 32-bit ustconsumer compat32 error socket path */ | |
4244 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4245 | if (ret < 0) { |
7753dea8 | 4246 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4247 | PERROR("chown"); |
fac6795d DG |
4248 | } |
4249 | ||
d6f42150 | 4250 | DBG("All permissions are set"); |
e07ae692 | 4251 | |
fac6795d DG |
4252 | end: |
4253 | return ret; | |
4254 | } | |
4255 | ||
7a485870 | 4256 | /* |
d063d709 | 4257 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4258 | * Closed in cleanup(). |
7a485870 DG |
4259 | */ |
4260 | static int create_kernel_poll_pipe(void) | |
4261 | { | |
730389d9 DG |
4262 | int ret, i; |
4263 | ||
4264 | ret = pipe(kernel_poll_pipe); | |
4265 | if (ret < 0) { | |
4266 | PERROR("kernel poll pipe"); | |
4267 | goto error; | |
4268 | } | |
4269 | ||
4270 | for (i = 0; i < 2; i++) { | |
4271 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4272 | if (ret < 0) { | |
4273 | PERROR("fcntl kernel_poll_pipe"); | |
4274 | goto error; | |
4275 | } | |
4276 | } | |
4277 | ||
4278 | error: | |
4279 | return ret; | |
7a485870 DG |
4280 | } |
4281 | ||
099e26bd DG |
4282 | /* |
4283 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4284 | * Closed in cleanup(). |
099e26bd DG |
4285 | */ |
4286 | static int create_apps_cmd_pipe(void) | |
4287 | { | |
730389d9 DG |
4288 | int ret, i; |
4289 | ||
4290 | ret = pipe(apps_cmd_pipe); | |
4291 | if (ret < 0) { | |
4292 | PERROR("apps cmd pipe"); | |
4293 | goto error; | |
4294 | } | |
4295 | ||
4296 | for (i = 0; i < 2; i++) { | |
4297 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4298 | if (ret < 0) { | |
4299 | PERROR("fcntl apps_cmd_pipe"); | |
4300 | goto error; | |
4301 | } | |
4302 | } | |
4303 | ||
4304 | error: | |
4305 | return ret; | |
099e26bd DG |
4306 | } |
4307 | ||
d6f42150 | 4308 | /* |
d063d709 | 4309 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4310 | */ |
67e40797 | 4311 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4312 | { |
4313 | int ret; | |
4314 | ||
67e40797 DG |
4315 | DBG3("Creating LTTng run directory: %s", rundir); |
4316 | ||
d1613cf5 | 4317 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4318 | if (ret < 0) { |
b1f11e69 | 4319 | if (errno != EEXIST) { |
67e40797 | 4320 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4321 | goto error; |
4322 | } else { | |
4323 | ret = 0; | |
4324 | } | |
d6f42150 DG |
4325 | } |
4326 | ||
4327 | error: | |
4328 | return ret; | |
4329 | } | |
4330 | ||
4331 | /* | |
d063d709 DG |
4332 | * Setup sockets and directory needed by the kconsumerd communication with the |
4333 | * session daemon. | |
d6f42150 | 4334 | */ |
67e40797 DG |
4335 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4336 | const char *rundir) | |
d6f42150 DG |
4337 | { |
4338 | int ret; | |
67e40797 | 4339 | char path[PATH_MAX]; |
d6f42150 | 4340 | |
67e40797 | 4341 | switch (consumer_data->type) { |
7753dea8 | 4342 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4343 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4344 | break; |
4345 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4346 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4347 | break; |
4348 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4349 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4350 | break; |
4351 | default: | |
4352 | ERR("Consumer type unknown"); | |
4353 | ret = -EINVAL; | |
4354 | goto error; | |
d6f42150 DG |
4355 | } |
4356 | ||
67e40797 DG |
4357 | DBG2("Creating consumer directory: %s", path); |
4358 | ||
d1613cf5 | 4359 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4360 | if (ret < 0) { |
6beb2242 | 4361 | if (errno != EEXIST) { |
f11e84c2 | 4362 | PERROR("mkdir"); |
3bd1e081 | 4363 | ERR("Failed to create %s", path); |
6beb2242 DG |
4364 | goto error; |
4365 | } | |
f11e84c2 | 4366 | ret = -1; |
d6f42150 DG |
4367 | } |
4368 | ||
4369 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4370 | consumer_data->err_sock = |
4371 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4372 | if (consumer_data->err_sock < 0) { | |
4373 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4374 | ret = -1; |
4375 | goto error; | |
4376 | } | |
4377 | ||
4378 | /* File permission MUST be 660 */ | |
3bd1e081 | 4379 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4380 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4381 | if (ret < 0) { |
3bd1e081 | 4382 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4383 | PERROR("chmod"); |
d6f42150 DG |
4384 | goto error; |
4385 | } | |
4386 | ||
4387 | error: | |
4388 | return ret; | |
4389 | } | |
4390 | ||
fac6795d | 4391 | /* |
d063d709 | 4392 | * Signal handler for the daemon |
cf3af59e | 4393 | * |
54d01ffb DG |
4394 | * Simply stop all worker threads, leaving main() return gracefully after |
4395 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4396 | */ |
4397 | static void sighandler(int sig) | |
4398 | { | |
4399 | switch (sig) { | |
cf3af59e | 4400 | case SIGPIPE: |
af87c45a | 4401 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4402 | return; |
4403 | case SIGINT: | |
af87c45a | 4404 | DBG("SIGINT caught"); |
cf3af59e MD |
4405 | stop_threads(); |
4406 | break; | |
4407 | case SIGTERM: | |
af87c45a | 4408 | DBG("SIGTERM caught"); |
cf3af59e MD |
4409 | stop_threads(); |
4410 | break; | |
4411 | default: | |
4412 | break; | |
fac6795d | 4413 | } |
fac6795d DG |
4414 | } |
4415 | ||
4416 | /* | |
d063d709 | 4417 | * Setup signal handler for : |
1d4b027a | 4418 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4419 | */ |
1d4b027a | 4420 | static int set_signal_handler(void) |
fac6795d | 4421 | { |
1d4b027a DG |
4422 | int ret = 0; |
4423 | struct sigaction sa; | |
4424 | sigset_t sigset; | |
fac6795d | 4425 | |
1d4b027a | 4426 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4427 | PERROR("sigemptyset"); |
1d4b027a DG |
4428 | return ret; |
4429 | } | |
d6f42150 | 4430 | |
1d4b027a DG |
4431 | sa.sa_handler = sighandler; |
4432 | sa.sa_mask = sigset; | |
4433 | sa.sa_flags = 0; | |
4434 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4435 | PERROR("sigaction"); |
1d4b027a | 4436 | return ret; |
d6f42150 DG |
4437 | } |
4438 | ||
1d4b027a | 4439 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4440 | PERROR("sigaction"); |
1d4b027a | 4441 | return ret; |
d6f42150 | 4442 | } |
aaf26714 | 4443 | |
1d4b027a | 4444 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4445 | PERROR("sigaction"); |
1d4b027a | 4446 | return ret; |
8c0faa1d DG |
4447 | } |
4448 | ||
1d4b027a DG |
4449 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4450 | ||
4451 | return ret; | |
fac6795d DG |
4452 | } |
4453 | ||
f3ed775e | 4454 | /* |
d063d709 DG |
4455 | * Set open files limit to unlimited. This daemon can open a large number of |
4456 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4457 | */ |
4458 | static void set_ulimit(void) | |
4459 | { | |
4460 | int ret; | |
4461 | struct rlimit lim; | |
4462 | ||
a88df331 | 4463 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4464 | lim.rlim_cur = 65535; |
4465 | lim.rlim_max = 65535; | |
4466 | ||
4467 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4468 | if (ret < 0) { | |
76d7553f | 4469 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4470 | } |
4471 | } | |
4472 | ||
fac6795d DG |
4473 | /* |
4474 | * main | |
4475 | */ | |
4476 | int main(int argc, char **argv) | |
4477 | { | |
fac6795d DG |
4478 | int ret = 0; |
4479 | void *status; | |
b082db07 | 4480 | const char *home_path; |
fac6795d | 4481 | |
335a95b7 MD |
4482 | init_kernel_workarounds(); |
4483 | ||
f6a9efaa DG |
4484 | rcu_register_thread(); |
4485 | ||
273ea72c | 4486 | /* Create thread quit pipe */ |
cf3af59e MD |
4487 | if ((ret = init_thread_quit_pipe()) < 0) { |
4488 | goto error; | |
273ea72c DG |
4489 | } |
4490 | ||
7753dea8 | 4491 | setup_consumerd_path(); |
fb09408a | 4492 | |
fac6795d DG |
4493 | /* Parse arguments */ |
4494 | progname = argv[0]; | |
4495 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4496 | goto error; |
fac6795d DG |
4497 | } |
4498 | ||
4499 | /* Daemonize */ | |
4500 | if (opt_daemon) { | |
53094c05 DG |
4501 | ret = daemon(0, 0); |
4502 | if (ret < 0) { | |
76d7553f | 4503 | PERROR("daemon"); |
cf3af59e | 4504 | goto error; |
53094c05 | 4505 | } |
fac6795d DG |
4506 | } |
4507 | ||
4508 | /* Check if daemon is UID = 0 */ | |
4509 | is_root = !getuid(); | |
4510 | ||
fac6795d | 4511 | if (is_root) { |
990570ed | 4512 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4513 | |
4514 | /* Create global run dir with root access */ | |
4515 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4516 | if (ret < 0) { |
cf3af59e | 4517 | goto error; |
d6f42150 DG |
4518 | } |
4519 | ||
fac6795d | 4520 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4521 | snprintf(apps_unix_sock_path, PATH_MAX, |
4522 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4523 | } |
4524 | ||
4525 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4526 | snprintf(client_unix_sock_path, PATH_MAX, |
4527 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4528 | } | |
0fdd1e2c DG |
4529 | |
4530 | /* Set global SHM for ust */ | |
4531 | if (strlen(wait_shm_path) == 0) { | |
4532 | snprintf(wait_shm_path, PATH_MAX, | |
4533 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4534 | } | |
67e40797 DG |
4535 | |
4536 | /* Setup kernel consumerd path */ | |
4537 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4538 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4539 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4540 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4541 | |
4542 | DBG2("Kernel consumer err path: %s", | |
4543 | kconsumer_data.err_unix_sock_path); | |
4544 | DBG2("Kernel consumer cmd path: %s", | |
4545 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4546 | } else { |
b082db07 DG |
4547 | home_path = get_home_dir(); |
4548 | if (home_path == NULL) { | |
273ea72c DG |
4549 | /* TODO: Add --socket PATH option */ |
4550 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4551 | ret = -EPERM; |
4552 | goto error; | |
b082db07 DG |
4553 | } |
4554 | ||
67e40797 DG |
4555 | /* |
4556 | * Create rundir from home path. This will create something like | |
4557 | * $HOME/.lttng | |
4558 | */ | |
990570ed | 4559 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4560 | if (ret < 0) { |
4561 | ret = -ENOMEM; | |
4562 | goto error; | |
4563 | } | |
4564 | ||
4565 | ret = create_lttng_rundir(rundir); | |
4566 | if (ret < 0) { | |
4567 | goto error; | |
4568 | } | |
4569 | ||
fac6795d | 4570 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4571 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4572 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4573 | } |
4574 | ||
4575 | /* Set the cli tool unix socket path */ | |
4576 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4577 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4578 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4579 | } |
0fdd1e2c DG |
4580 | |
4581 | /* Set global SHM for ust */ | |
4582 | if (strlen(wait_shm_path) == 0) { | |
4583 | snprintf(wait_shm_path, PATH_MAX, | |
4584 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4585 | } | |
fac6795d DG |
4586 | } |
4587 | ||
f22d70f0 DG |
4588 | /* Set consumer initial state */ |
4589 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4590 | ust_consumerd_state = CONSUMER_STOPPED; | |
4591 | ||
847177cd DG |
4592 | DBG("Client socket path %s", client_unix_sock_path); |
4593 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4594 | DBG("LTTng run directory path: %s", rundir); |
4595 | ||
4596 | /* 32 bits consumerd path setup */ | |
4597 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4598 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4599 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4600 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4601 | |
4602 | DBG2("UST consumer 32 bits err path: %s", | |
4603 | ustconsumer32_data.err_unix_sock_path); | |
4604 | DBG2("UST consumer 32 bits cmd path: %s", | |
4605 | ustconsumer32_data.cmd_unix_sock_path); | |
4606 | ||
4607 | /* 64 bits consumerd path setup */ | |
4608 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4609 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4610 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4611 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4612 | |
4613 | DBG2("UST consumer 64 bits err path: %s", | |
4614 | ustconsumer64_data.err_unix_sock_path); | |
4615 | DBG2("UST consumer 64 bits cmd path: %s", | |
4616 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4617 | |
273ea72c | 4618 | /* |
7d8234d9 | 4619 | * See if daemon already exist. |
fac6795d | 4620 | */ |
7d8234d9 | 4621 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4622 | ERR("Already running daemon.\n"); |
273ea72c | 4623 | /* |
cf3af59e MD |
4624 | * We do not goto exit because we must not cleanup() |
4625 | * because a daemon is already running. | |
ab118b20 | 4626 | */ |
cf3af59e | 4627 | goto error; |
a88df331 DG |
4628 | } |
4629 | ||
1427f9b2 DG |
4630 | /* |
4631 | * Init UST app hash table. Alloc hash table before this point since | |
4632 | * cleanup() can get called after that point. | |
4633 | */ | |
4634 | ust_app_ht_alloc(); | |
4635 | ||
54d01ffb | 4636 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4637 | |
4638 | /* | |
4639 | * These actions must be executed as root. We do that *after* setting up | |
4640 | * the sockets path because we MUST make the check for another daemon using | |
4641 | * those paths *before* trying to set the kernel consumer sockets and init | |
4642 | * kernel tracer. | |
4643 | */ | |
4644 | if (is_root) { | |
67e40797 | 4645 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4646 | if (ret < 0) { |
4647 | goto exit; | |
4648 | } | |
4649 | ||
a88df331 | 4650 | /* Setup kernel tracer */ |
4fba7219 DG |
4651 | if (!opt_no_kernel) { |
4652 | init_kernel_tracer(); | |
4653 | } | |
a88df331 DG |
4654 | |
4655 | /* Set ulimit for open files */ | |
4656 | set_ulimit(); | |
fac6795d | 4657 | } |
4063050c MD |
4658 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4659 | lttng_fd_init(); | |
fac6795d | 4660 | |
67e40797 DG |
4661 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4662 | if (ret < 0) { | |
4663 | goto exit; | |
4664 | } | |
4665 | ||
4666 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4667 | if (ret < 0) { | |
4668 | goto exit; | |
4669 | } | |
4670 | ||
cf3af59e MD |
4671 | if ((ret = set_signal_handler()) < 0) { |
4672 | goto exit; | |
fac6795d DG |
4673 | } |
4674 | ||
d6f42150 | 4675 | /* Setup the needed unix socket */ |
cf3af59e MD |
4676 | if ((ret = init_daemon_socket()) < 0) { |
4677 | goto exit; | |
fac6795d DG |
4678 | } |
4679 | ||
4680 | /* Set credentials to socket */ | |
be040666 | 4681 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4682 | goto exit; |
fac6795d DG |
4683 | } |
4684 | ||
5b8719f5 DG |
4685 | /* Get parent pid if -S, --sig-parent is specified. */ |
4686 | if (opt_sig_parent) { | |
4687 | ppid = getppid(); | |
4688 | } | |
4689 | ||
7a485870 | 4690 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4691 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4692 | goto exit; | |
7a485870 DG |
4693 | } |
4694 | ||
099e26bd DG |
4695 | /* Setup the thread apps communication pipe. */ |
4696 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4697 | goto exit; | |
4698 | } | |
4699 | ||
4700 | /* Init UST command queue. */ | |
4701 | cds_wfq_init(&ust_cmd_queue.queue); | |
4702 | ||
273ea72c | 4703 | /* |
54d01ffb DG |
4704 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4705 | * statically declared in session.c | |
273ea72c | 4706 | */ |
54d01ffb | 4707 | session_list_ptr = session_get_list(); |
b5541356 | 4708 | |
5eb91c98 DG |
4709 | /* Set up max poll set size */ |
4710 | lttng_poll_set_max_size(); | |
4711 | ||
cf3af59e | 4712 | /* Create thread to manage the client socket */ |
099e26bd DG |
4713 | ret = pthread_create(&client_thread, NULL, |
4714 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4715 | if (ret != 0) { |
76d7553f | 4716 | PERROR("pthread_create clients"); |
cf3af59e MD |
4717 | goto exit_client; |
4718 | } | |
fac6795d | 4719 | |
099e26bd DG |
4720 | /* Create thread to dispatch registration */ |
4721 | ret = pthread_create(&dispatch_thread, NULL, | |
4722 | thread_dispatch_ust_registration, (void *) NULL); | |
4723 | if (ret != 0) { | |
76d7553f | 4724 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4725 | goto exit_dispatch; |
4726 | } | |
4727 | ||
4728 | /* Create thread to manage application registration. */ | |
4729 | ret = pthread_create(®_apps_thread, NULL, | |
4730 | thread_registration_apps, (void *) NULL); | |
4731 | if (ret != 0) { | |
76d7553f | 4732 | PERROR("pthread_create registration"); |
099e26bd DG |
4733 | goto exit_reg_apps; |
4734 | } | |
4735 | ||
cf3af59e | 4736 | /* Create thread to manage application socket */ |
54d01ffb DG |
4737 | ret = pthread_create(&apps_thread, NULL, |
4738 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4739 | if (ret != 0) { |
76d7553f | 4740 | PERROR("pthread_create apps"); |
cf3af59e MD |
4741 | goto exit_apps; |
4742 | } | |
fac6795d | 4743 | |
cf3af59e | 4744 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4745 | ret = pthread_create(&kernel_thread, NULL, |
4746 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4747 | if (ret != 0) { |
76d7553f | 4748 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4749 | goto exit_kernel; |
4750 | } | |
7a485870 | 4751 | |
cf3af59e MD |
4752 | ret = pthread_join(kernel_thread, &status); |
4753 | if (ret != 0) { | |
76d7553f | 4754 | PERROR("pthread_join"); |
cf3af59e | 4755 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4756 | } |
4757 | ||
cf3af59e MD |
4758 | exit_kernel: |
4759 | ret = pthread_join(apps_thread, &status); | |
4760 | if (ret != 0) { | |
76d7553f | 4761 | PERROR("pthread_join"); |
cf3af59e MD |
4762 | goto error; /* join error, exit without cleanup */ |
4763 | } | |
fac6795d | 4764 | |
cf3af59e | 4765 | exit_apps: |
099e26bd DG |
4766 | ret = pthread_join(reg_apps_thread, &status); |
4767 | if (ret != 0) { | |
76d7553f | 4768 | PERROR("pthread_join"); |
099e26bd DG |
4769 | goto error; /* join error, exit without cleanup */ |
4770 | } | |
4771 | ||
4772 | exit_reg_apps: | |
4773 | ret = pthread_join(dispatch_thread, &status); | |
4774 | if (ret != 0) { | |
76d7553f | 4775 | PERROR("pthread_join"); |
099e26bd DG |
4776 | goto error; /* join error, exit without cleanup */ |
4777 | } | |
4778 | ||
4779 | exit_dispatch: | |
cf3af59e MD |
4780 | ret = pthread_join(client_thread, &status); |
4781 | if (ret != 0) { | |
76d7553f | 4782 | PERROR("pthread_join"); |
cf3af59e MD |
4783 | goto error; /* join error, exit without cleanup */ |
4784 | } | |
4785 | ||
3bd1e081 | 4786 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4787 | if (ret != 0) { |
76d7553f | 4788 | PERROR("join_consumer"); |
cf3af59e MD |
4789 | goto error; /* join error, exit without cleanup */ |
4790 | } | |
a88df331 | 4791 | |
cf3af59e | 4792 | exit_client: |
a88df331 | 4793 | exit: |
cf3af59e MD |
4794 | /* |
4795 | * cleanup() is called when no other thread is running. | |
4796 | */ | |
f6a9efaa | 4797 | rcu_thread_online(); |
cf3af59e | 4798 | cleanup(); |
f6a9efaa DG |
4799 | rcu_thread_offline(); |
4800 | rcu_unregister_thread(); | |
67e40797 | 4801 | if (!ret) { |
cf3af59e | 4802 | exit(EXIT_SUCCESS); |
67e40797 | 4803 | } |
cf3af59e | 4804 | error: |
5e16da05 | 4805 | exit(EXIT_FAILURE); |
fac6795d | 4806 | } |