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 | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.h> |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
50c8f484 | 46 | #include <common/futex.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
099e26bd | 50 | #include "context.h" |
54d01ffb | 51 | #include "event.h" |
4771f025 | 52 | #include "kernel.h" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
4063050c | 57 | #include "fd-limit.h" |
fac6795d | 58 | |
ebaeda94 MD |
59 | #define CONSUMERD_FILE "lttng-consumerd" |
60 | ||
3bd1e081 MD |
61 | struct consumer_data { |
62 | enum lttng_consumer_type type; | |
63 | ||
64 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
65 | sem_t sem; | |
66 | ||
67 | /* Mutex to control consumerd pid assignation */ | |
68 | pthread_mutex_t pid_mutex; | |
69 | pid_t pid; | |
70 | ||
71 | int err_sock; | |
72 | int cmd_sock; | |
73 | ||
74 | /* consumer error and command Unix socket path */ | |
75 | char err_unix_sock_path[PATH_MAX]; | |
76 | char cmd_unix_sock_path[PATH_MAX]; | |
77 | }; | |
78 | ||
75462a81 | 79 | /* Const values */ |
686204ab | 80 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 81 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
82 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
83 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
84 | ||
fac6795d DG |
85 | const char *progname; |
86 | const char *opt_tracing_group; | |
5b8719f5 | 87 | static int opt_sig_parent; |
97e19046 | 88 | static int opt_verbose_consumer; |
fac6795d | 89 | static int opt_daemon; |
4fba7219 | 90 | static int opt_no_kernel; |
fac6795d | 91 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 92 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 93 | static char *rundir; |
3bd1e081 MD |
94 | |
95 | /* Consumer daemon specific control data */ | |
96 | static struct consumer_data kconsumer_data = { | |
97 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
98 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
99 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
100 | .err_sock = -1, |
101 | .cmd_sock = -1, | |
3bd1e081 | 102 | }; |
7753dea8 MD |
103 | static struct consumer_data ustconsumer64_data = { |
104 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
105 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
106 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
107 | .err_sock = -1, |
108 | .cmd_sock = -1, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
3bd1e081 MD |
116 | }; |
117 | ||
099e26bd | 118 | static int dispatch_thread_exit; |
fac6795d | 119 | |
54d01ffb DG |
120 | /* Global application Unix socket path */ |
121 | static char apps_unix_sock_path[PATH_MAX]; | |
122 | /* Global client Unix socket path */ | |
123 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
124 | /* global wait shm path for UST */ |
125 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 126 | |
1d4b027a | 127 | /* Sockets and FDs */ |
a4b35e07 MD |
128 | static int client_sock = -1; |
129 | static int apps_sock = -1; | |
130 | static int kernel_tracer_fd = -1; | |
76d7553f | 131 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 132 | |
273ea72c DG |
133 | /* |
134 | * Quit pipe for all threads. This permits a single cancellation point | |
135 | * for all threads when receiving an event on the pipe. | |
136 | */ | |
76d7553f | 137 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 138 | |
099e26bd DG |
139 | /* |
140 | * This pipe is used to inform the thread managing application communication | |
141 | * that a command is queued and ready to be processed. | |
142 | */ | |
76d7553f | 143 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 144 | |
1d4b027a | 145 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 146 | static pthread_t apps_thread; |
099e26bd | 147 | static pthread_t reg_apps_thread; |
1d4b027a | 148 | static pthread_t client_thread; |
7a485870 | 149 | static pthread_t kernel_thread; |
099e26bd | 150 | static pthread_t dispatch_thread; |
5eb91c98 | 151 | |
fac6795d | 152 | |
099e26bd DG |
153 | /* |
154 | * UST registration command queue. This queue is tied with a futex and uses a N | |
155 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
156 | * | |
157 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
158 | * this queue and the wait/wake scheme. | |
159 | */ | |
160 | static struct ust_cmd_queue ust_cmd_queue; | |
161 | ||
b5541356 DG |
162 | /* |
163 | * Pointer initialized before thread creation. | |
164 | * | |
165 | * This points to the tracing session list containing the session count and a | |
166 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
167 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 168 | * |
d063d709 | 169 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 170 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
171 | */ |
172 | static struct ltt_session_list *session_list_ptr; | |
173 | ||
7753dea8 MD |
174 | int ust_consumerd64_fd = -1; |
175 | int ust_consumerd32_fd = -1; | |
176 | ||
fb6f1fa2 YB |
177 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
178 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
179 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
180 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 181 | |
5c827ce0 DG |
182 | /* |
183 | * Consumer daemon state which is changed when spawning it, killing it or in | |
184 | * case of a fatal error. | |
185 | */ | |
186 | enum consumerd_state { | |
187 | CONSUMER_STARTED = 1, | |
188 | CONSUMER_STOPPED = 2, | |
189 | CONSUMER_ERROR = 3, | |
190 | }; | |
191 | ||
192 | /* | |
193 | * This consumer daemon state is used to validate if a client command will be | |
194 | * able to reach the consumer. If not, the client is informed. For instance, | |
195 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
196 | * error to the client. | |
197 | * | |
198 | * The following example shows a possible race condition of this scheme: | |
199 | * | |
200 | * consumer thread error happens | |
201 | * client cmd arrives | |
202 | * client cmd checks state -> still OK | |
203 | * consumer thread exit, sets error | |
204 | * client cmd try to talk to consumer | |
205 | * ... | |
206 | * | |
207 | * However, since the consumer is a different daemon, we have no way of making | |
208 | * sure the command will reach it safely even with this state flag. This is why | |
209 | * we consider that up to the state validation during command processing, the | |
210 | * command is safe. After that, we can not guarantee the correctness of the | |
211 | * client request vis-a-vis the consumer. | |
212 | */ | |
213 | static enum consumerd_state ust_consumerd_state; | |
214 | static enum consumerd_state kernel_consumerd_state; | |
215 | ||
fb09408a | 216 | static |
7753dea8 | 217 | void setup_consumerd_path(void) |
fb09408a | 218 | { |
fc7a59ce | 219 | const char *bin, *libdir; |
fb09408a | 220 | |
7753dea8 MD |
221 | /* |
222 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
223 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
224 | * has not been defined. | |
7753dea8 | 225 | */ |
ebaeda94 | 226 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
227 | if (!consumerd32_bin[0]) { |
228 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
229 | } |
230 | if (!consumerd32_libdir[0]) { | |
231 | consumerd32_libdir = INSTALL_LIB_PATH; | |
232 | } | |
233 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
234 | if (!consumerd64_bin[0]) { |
235 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 236 | } |
ebaeda94 MD |
237 | if (!consumerd64_libdir[0]) { |
238 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
239 | } |
240 | #else | |
241 | #error "Unknown bitness" | |
242 | #endif | |
243 | ||
fb09408a MD |
244 | /* |
245 | * runtime env. var. overrides the build default. | |
246 | */ | |
fc7a59ce AM |
247 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
248 | if (bin) { | |
249 | consumerd32_bin = bin; | |
7753dea8 | 250 | } |
fc7a59ce AM |
251 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
252 | if (bin) { | |
253 | consumerd64_bin = bin; | |
ebaeda94 | 254 | } |
72f579ee | 255 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
256 | if (libdir) { |
257 | consumerd32_libdir = libdir; | |
258 | } | |
72f579ee | 259 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
260 | if (libdir) { |
261 | consumerd64_libdir = libdir; | |
fb09408a MD |
262 | } |
263 | } | |
264 | ||
5eb91c98 DG |
265 | /* |
266 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
267 | */ | |
268 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
269 | unsigned int size) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | if (events == NULL || size == 0) { | |
274 | ret = -1; | |
275 | goto error; | |
276 | } | |
277 | ||
278 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
279 | if (ret < 0) { | |
280 | goto error; | |
281 | } | |
282 | ||
283 | /* Add quit pipe */ | |
284 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
285 | if (ret < 0) { | |
286 | goto error; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | ||
291 | error: | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Check if the thread quit pipe was triggered. | |
297 | * | |
298 | * Return 1 if it was triggered else 0; | |
299 | */ | |
300 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
301 | { | |
302 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
303 | return 1; | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
0fdd1e2c DG |
309 | /* |
310 | * Return group ID of the tracing group or -1 if not found. | |
311 | */ | |
996b65c8 MD |
312 | static gid_t allowed_group(void) |
313 | { | |
314 | struct group *grp; | |
315 | ||
274e143b MD |
316 | if (opt_tracing_group) { |
317 | grp = getgrnam(opt_tracing_group); | |
318 | } else { | |
319 | grp = getgrnam(default_tracing_group); | |
320 | } | |
996b65c8 MD |
321 | if (!grp) { |
322 | return -1; | |
323 | } else { | |
324 | return grp->gr_gid; | |
325 | } | |
326 | } | |
327 | ||
273ea72c | 328 | /* |
5eb91c98 | 329 | * Init thread quit pipe. |
273ea72c DG |
330 | * |
331 | * Return -1 on error or 0 if all pipes are created. | |
332 | */ | |
333 | static int init_thread_quit_pipe(void) | |
334 | { | |
730389d9 | 335 | int ret, i; |
273ea72c | 336 | |
730389d9 | 337 | ret = pipe(thread_quit_pipe); |
273ea72c | 338 | if (ret < 0) { |
730389d9 | 339 | PERROR("thread quit pipe"); |
273ea72c DG |
340 | goto error; |
341 | } | |
342 | ||
730389d9 DG |
343 | for (i = 0; i < 2; i++) { |
344 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
345 | if (ret < 0) { | |
346 | PERROR("fcntl"); | |
347 | goto error; | |
348 | } | |
349 | } | |
350 | ||
273ea72c DG |
351 | error: |
352 | return ret; | |
353 | } | |
354 | ||
fac6795d | 355 | /* |
d063d709 DG |
356 | * Complete teardown of a kernel session. This free all data structure related |
357 | * to a kernel session and update counter. | |
fac6795d | 358 | */ |
1d4b027a | 359 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 360 | { |
8f7a84dd | 361 | if (!session->kernel_session) { |
99bab54f | 362 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 363 | return; |
8f7a84dd DG |
364 | } |
365 | ||
84ea9c99 | 366 | DBG("Tearing down kernel session"); |
d9800920 | 367 | |
84ea9c99 MD |
368 | /* |
369 | * If a custom kernel consumer was registered, close the socket before | |
370 | * tearing down the complete kernel session structure | |
371 | */ | |
03550b58 MD |
372 | if (kconsumer_data.cmd_sock >= 0 && |
373 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 374 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 375 | } |
84ea9c99 MD |
376 | |
377 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
378 | } |
379 | ||
f6a9efaa DG |
380 | /* |
381 | * Complete teardown of all UST sessions. This will free everything on his path | |
382 | * and destroy the core essence of all ust sessions :) | |
383 | */ | |
384 | static void teardown_ust_session(struct ltt_session *session) | |
385 | { | |
84cd17c6 MD |
386 | int ret; |
387 | ||
8f7a84dd | 388 | if (!session->ust_session) { |
99bab54f | 389 | DBG3("No UST session when tearing down session"); |
f470a390 | 390 | return; |
8f7a84dd DG |
391 | } |
392 | ||
84ea9c99 | 393 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 394 | |
84cd17c6 MD |
395 | ret = ust_app_destroy_trace_all(session->ust_session); |
396 | if (ret) { | |
397 | ERR("Error in ust_app_destroy_trace_all"); | |
398 | } | |
8f7a84dd | 399 | |
f6a9efaa DG |
400 | trace_ust_destroy_session(session->ust_session); |
401 | } | |
402 | ||
099e26bd DG |
403 | /* |
404 | * Stop all threads by closing the thread quit pipe. | |
405 | */ | |
cf3af59e MD |
406 | static void stop_threads(void) |
407 | { | |
5eb91c98 DG |
408 | int ret; |
409 | ||
cf3af59e MD |
410 | /* Stopping all threads */ |
411 | DBG("Terminating all threads"); | |
54d01ffb | 412 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
413 | if (ret < 0) { |
414 | ERR("write error on thread quit pipe"); | |
415 | } | |
416 | ||
099e26bd DG |
417 | /* Dispatch thread */ |
418 | dispatch_thread_exit = 1; | |
419 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
420 | } |
421 | ||
fac6795d | 422 | /* |
d063d709 | 423 | * Cleanup the daemon |
fac6795d | 424 | */ |
cf3af59e | 425 | static void cleanup(void) |
fac6795d | 426 | { |
76d7553f | 427 | int ret, i; |
1d4b027a | 428 | char *cmd; |
af9737e9 | 429 | struct ltt_session *sess, *stmp; |
fac6795d | 430 | |
1d4b027a | 431 | DBG("Cleaning up"); |
e07ae692 | 432 | |
67e40797 DG |
433 | DBG("Removing %s directory", rundir); |
434 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
435 | if (ret < 0) { | |
436 | ERR("asprintf failed. Something is really wrong!"); | |
437 | } | |
5461b305 | 438 | |
67e40797 DG |
439 | /* Remove lttng run directory */ |
440 | ret = system(cmd); | |
441 | if (ret < 0) { | |
442 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 443 | } |
67e40797 | 444 | free(cmd); |
5461b305 | 445 | |
99bab54f | 446 | DBG("Cleaning up all sessions"); |
fac6795d | 447 | |
b5541356 | 448 | /* Destroy session list mutex */ |
273ea72c DG |
449 | if (session_list_ptr != NULL) { |
450 | pthread_mutex_destroy(&session_list_ptr->lock); | |
451 | ||
452 | /* Cleanup ALL session */ | |
54d01ffb DG |
453 | cds_list_for_each_entry_safe(sess, stmp, |
454 | &session_list_ptr->head, list) { | |
273ea72c | 455 | teardown_kernel_session(sess); |
f6a9efaa DG |
456 | teardown_ust_session(sess); |
457 | free(sess); | |
273ea72c DG |
458 | } |
459 | } | |
460 | ||
099e26bd | 461 | DBG("Closing all UST sockets"); |
56fff090 | 462 | ust_app_clean_list(); |
099e26bd | 463 | |
3bd1e081 | 464 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 465 | |
4fba7219 DG |
466 | if (is_root && !opt_no_kernel) { |
467 | DBG2("Closing kernel fd"); | |
a4b35e07 | 468 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
469 | ret = close(kernel_tracer_fd); |
470 | if (ret) { | |
471 | PERROR("close"); | |
472 | } | |
a4b35e07 | 473 | } |
2f50c8a3 | 474 | DBG("Unloading kernel modules"); |
096102bd | 475 | modprobe_remove_lttng_all(); |
2f50c8a3 | 476 | } |
5eb91c98 | 477 | |
76d7553f MD |
478 | /* |
479 | * Closing all pipes used for communication between threads. | |
480 | */ | |
481 | for (i = 0; i < 2; i++) { | |
482 | if (kernel_poll_pipe[i] >= 0) { | |
483 | ret = close(kernel_poll_pipe[i]); | |
484 | if (ret) { | |
485 | PERROR("close"); | |
486 | } | |
76d7553f MD |
487 | } |
488 | } | |
489 | for (i = 0; i < 2; i++) { | |
490 | if (thread_quit_pipe[i] >= 0) { | |
491 | ret = close(thread_quit_pipe[i]); | |
492 | if (ret) { | |
493 | PERROR("close"); | |
494 | } | |
495 | } | |
496 | } | |
497 | for (i = 0; i < 2; i++) { | |
498 | if (apps_cmd_pipe[i] >= 0) { | |
499 | ret = close(apps_cmd_pipe[i]); | |
500 | if (ret) { | |
501 | PERROR("close"); | |
502 | } | |
503 | } | |
504 | } | |
421cb601 DG |
505 | |
506 | /* <fun> */ | |
f56a39af | 507 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
508 | "Matthew, BEET driven development works!%c[%dm", |
509 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
510 | /* </fun> */ | |
fac6795d DG |
511 | } |
512 | ||
e065084a | 513 | /* |
d063d709 | 514 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 515 | * |
d063d709 | 516 | * Return lttcomm error code. |
e065084a DG |
517 | */ |
518 | static int send_unix_sock(int sock, void *buf, size_t len) | |
519 | { | |
520 | /* Check valid length */ | |
521 | if (len <= 0) { | |
522 | return -1; | |
523 | } | |
524 | ||
525 | return lttcomm_send_unix_sock(sock, buf, len); | |
526 | } | |
527 | ||
5461b305 | 528 | /* |
d063d709 | 529 | * Free memory of a command context structure. |
5461b305 | 530 | */ |
a2fb29a5 | 531 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 532 | { |
a2fb29a5 DG |
533 | DBG("Clean command context structure"); |
534 | if (*cmd_ctx) { | |
535 | if ((*cmd_ctx)->llm) { | |
536 | free((*cmd_ctx)->llm); | |
5461b305 | 537 | } |
a2fb29a5 DG |
538 | if ((*cmd_ctx)->lsm) { |
539 | free((*cmd_ctx)->lsm); | |
5461b305 | 540 | } |
a2fb29a5 DG |
541 | free(*cmd_ctx); |
542 | *cmd_ctx = NULL; | |
5461b305 DG |
543 | } |
544 | } | |
545 | ||
f3ed775e | 546 | /* |
d063d709 | 547 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 548 | */ |
2bdd86d4 | 549 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
550 | int sock, struct ltt_kernel_channel *channel, |
551 | uid_t uid, gid_t gid) | |
f3ed775e DG |
552 | { |
553 | int ret; | |
f3ed775e | 554 | struct ltt_kernel_stream *stream; |
3bd1e081 | 555 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 556 | |
3bd1e081 | 557 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 558 | channel->channel->name); |
f3ed775e | 559 | |
3bd1e081 MD |
560 | /* Send channel */ |
561 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
562 | lkm.u.channel.channel_key = channel->fd; | |
563 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
564 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 565 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 566 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 567 | if (ret < 0) { |
76d7553f | 568 | PERROR("send consumer channel"); |
f3ed775e DG |
569 | goto error; |
570 | } | |
571 | ||
3bd1e081 | 572 | /* Send streams */ |
7a485870 | 573 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
574 | if (!stream->fd) { |
575 | continue; | |
576 | } | |
577 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
578 | lkm.u.stream.channel_key = channel->fd; | |
579 | lkm.u.stream.stream_key = stream->fd; | |
580 | lkm.u.stream.state = stream->state; | |
581 | lkm.u.stream.output = channel->channel->attr.output; | |
582 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
583 | lkm.u.stream.uid = uid; |
584 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
585 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
586 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
587 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
588 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
589 | if (ret < 0) { | |
76d7553f | 590 | PERROR("send consumer stream"); |
3bd1e081 MD |
591 | goto error; |
592 | } | |
593 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
594 | if (ret < 0) { | |
76d7553f | 595 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 596 | goto error; |
f3ed775e DG |
597 | } |
598 | } | |
599 | ||
3bd1e081 | 600 | DBG("consumer channel streams sent"); |
f3ed775e DG |
601 | |
602 | return 0; | |
603 | ||
604 | error: | |
605 | return ret; | |
606 | } | |
607 | ||
608 | /* | |
d063d709 | 609 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 610 | */ |
2bdd86d4 | 611 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 612 | struct ltt_kernel_session *session) |
f3ed775e DG |
613 | { |
614 | int ret; | |
615 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
616 | struct lttcomm_consumer_msg lkm; |
617 | int sock = session->consumer_fd; | |
7a485870 DG |
618 | |
619 | DBG("Sending metadata stream fd"); | |
620 | ||
03550b58 MD |
621 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
622 | if (session->consumer_fd < 0) { | |
3bd1e081 | 623 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
624 | } |
625 | ||
03550b58 | 626 | if (session->metadata_stream_fd >= 0) { |
3bd1e081 MD |
627 | /* Send metadata channel fd */ |
628 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
629 | lkm.u.channel.channel_key = session->metadata->fd; | |
630 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
631 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
032b44f0 | 632 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 MD |
633 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
634 | if (ret < 0) { | |
76d7553f | 635 | PERROR("send consumer channel"); |
3bd1e081 MD |
636 | goto error; |
637 | } | |
638 | ||
639 | /* Send metadata stream fd */ | |
640 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
641 | lkm.u.stream.channel_key = session->metadata->fd; | |
642 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
643 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
644 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
645 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
646 | lkm.u.stream.uid = session->uid; |
647 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
648 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
649 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
650 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
651 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
652 | if (ret < 0) { | |
76d7553f | 653 | PERROR("send consumer stream"); |
3bd1e081 MD |
654 | goto error; |
655 | } | |
656 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 657 | if (ret < 0) { |
76d7553f | 658 | PERROR("send consumer stream"); |
7a485870 DG |
659 | goto error; |
660 | } | |
661 | } | |
f3ed775e | 662 | |
f3ed775e | 663 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
664 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
665 | session->uid, session->gid); | |
2bdd86d4 MD |
666 | if (ret < 0) { |
667 | goto error; | |
668 | } | |
669 | } | |
670 | ||
671 | DBG("consumer fds (metadata and channel streams) sent"); | |
672 | ||
673 | return 0; | |
674 | ||
675 | error: | |
676 | return ret; | |
677 | } | |
678 | ||
fac6795d | 679 | /* |
0fdd1e2c | 680 | * Notify UST applications using the shm mmap futex. |
fac6795d | 681 | */ |
0fdd1e2c | 682 | static int notify_ust_apps(int active) |
fac6795d | 683 | { |
0fdd1e2c | 684 | char *wait_shm_mmap; |
fac6795d | 685 | |
0fdd1e2c | 686 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 687 | |
0fdd1e2c DG |
688 | /* See shm.c for this call implying mmap, shm and futex calls */ |
689 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
690 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
691 | goto error; |
692 | } | |
693 | ||
0fdd1e2c DG |
694 | /* Wake waiting process */ |
695 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
696 | ||
697 | /* Apps notified successfully */ | |
698 | return 0; | |
fac6795d DG |
699 | |
700 | error: | |
0fdd1e2c | 701 | return -1; |
fac6795d DG |
702 | } |
703 | ||
e065084a | 704 | /* |
d063d709 DG |
705 | * Setup the outgoing data buffer for the response (llm) by allocating the |
706 | * right amount of memory and copying the original information from the lsm | |
707 | * structure. | |
ca95a216 | 708 | * |
d063d709 | 709 | * Return total size of the buffer pointed by buf. |
ca95a216 | 710 | */ |
5461b305 | 711 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 712 | { |
f3ed775e | 713 | int ret, buf_size; |
ca95a216 | 714 | |
f3ed775e | 715 | buf_size = size; |
5461b305 | 716 | |
ba7f0ae5 | 717 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 718 | if (cmd_ctx->llm == NULL) { |
76d7553f | 719 | PERROR("zmalloc"); |
5461b305 | 720 | ret = -ENOMEM; |
ca95a216 DG |
721 | goto error; |
722 | } | |
723 | ||
5461b305 DG |
724 | /* Copy common data */ |
725 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 726 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 727 | |
5461b305 DG |
728 | cmd_ctx->llm->data_size = size; |
729 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
730 | ||
ca95a216 DG |
731 | return buf_size; |
732 | ||
733 | error: | |
734 | return ret; | |
735 | } | |
736 | ||
7a485870 | 737 | /* |
5eb91c98 | 738 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 739 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 740 | */ |
5eb91c98 | 741 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 742 | { |
5eb91c98 | 743 | int ret; |
7a485870 DG |
744 | struct ltt_session *session; |
745 | struct ltt_kernel_channel *channel; | |
746 | ||
5eb91c98 | 747 | DBG("Updating kernel poll set"); |
7a485870 | 748 | |
54d01ffb | 749 | session_lock_list(); |
b5541356 | 750 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 751 | session_lock(session); |
7a485870 | 752 | if (session->kernel_session == NULL) { |
54d01ffb | 753 | session_unlock(session); |
7a485870 DG |
754 | continue; |
755 | } | |
7a485870 | 756 | |
54d01ffb DG |
757 | cds_list_for_each_entry(channel, |
758 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
759 | /* Add channel fd to the kernel poll set */ |
760 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
761 | if (ret < 0) { | |
54d01ffb | 762 | session_unlock(session); |
5eb91c98 DG |
763 | goto error; |
764 | } | |
765 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 766 | } |
54d01ffb | 767 | session_unlock(session); |
7a485870 | 768 | } |
54d01ffb | 769 | session_unlock_list(); |
7a485870 | 770 | |
5eb91c98 | 771 | return 0; |
7a485870 DG |
772 | |
773 | error: | |
54d01ffb | 774 | session_unlock_list(); |
7a485870 DG |
775 | return -1; |
776 | } | |
777 | ||
778 | /* | |
54d01ffb | 779 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 780 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 781 | * |
d063d709 | 782 | * Useful for CPU hotplug feature. |
7a485870 | 783 | */ |
2bdd86d4 | 784 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
785 | { |
786 | int ret = 0; | |
787 | struct ltt_session *session; | |
788 | struct ltt_kernel_channel *channel; | |
789 | ||
790 | DBG("Updating kernel streams for channel fd %d", fd); | |
791 | ||
54d01ffb | 792 | session_lock_list(); |
b5541356 | 793 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 794 | session_lock(session); |
7a485870 | 795 | if (session->kernel_session == NULL) { |
54d01ffb | 796 | session_unlock(session); |
7a485870 DG |
797 | continue; |
798 | } | |
d9800920 | 799 | |
03550b58 MD |
800 | /* This is not suppose to be -1 but this is an extra security check */ |
801 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 802 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
803 | } |
804 | ||
5eb91c98 DG |
805 | cds_list_for_each_entry(channel, |
806 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
807 | if (channel->fd == fd) { |
808 | DBG("Channel found, updating kernel streams"); | |
809 | ret = kernel_open_channel_stream(channel); | |
810 | if (ret < 0) { | |
b3c750d2 | 811 | goto error; |
7a485870 | 812 | } |
d9800920 | 813 | |
7a485870 | 814 | /* |
5eb91c98 DG |
815 | * Have we already sent fds to the consumer? If yes, it means |
816 | * that tracing is started so it is safe to send our updated | |
817 | * stream fds. | |
7a485870 | 818 | */ |
3bd1e081 | 819 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 820 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
821 | session->kernel_session->consumer_fd, channel, |
822 | session->uid, session->gid); | |
7a485870 | 823 | if (ret < 0) { |
b3c750d2 | 824 | goto error; |
7a485870 DG |
825 | } |
826 | } | |
b3c750d2 | 827 | goto error; |
7a485870 DG |
828 | } |
829 | } | |
54d01ffb | 830 | session_unlock(session); |
7a485870 | 831 | } |
54d01ffb | 832 | session_unlock_list(); |
b3c750d2 | 833 | return ret; |
7a485870 | 834 | |
b3c750d2 | 835 | error: |
54d01ffb DG |
836 | session_unlock(session); |
837 | session_unlock_list(); | |
7a485870 DG |
838 | return ret; |
839 | } | |
840 | ||
487cf67c DG |
841 | /* |
842 | * For each tracing session, update newly registered apps. | |
843 | */ | |
844 | static void update_ust_app(int app_sock) | |
845 | { | |
846 | struct ltt_session *sess, *stmp; | |
847 | ||
4ee14516 DG |
848 | session_lock_list(); |
849 | ||
487cf67c DG |
850 | /* For all tracing session(s) */ |
851 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 852 | session_lock(sess); |
421cb601 DG |
853 | if (sess->ust_session) { |
854 | ust_app_global_update(sess->ust_session, app_sock); | |
855 | } | |
4ee14516 | 856 | session_unlock(sess); |
487cf67c | 857 | } |
4ee14516 DG |
858 | |
859 | session_unlock_list(); | |
487cf67c DG |
860 | } |
861 | ||
7a485870 | 862 | /* |
d063d709 | 863 | * This thread manage event coming from the kernel. |
7a485870 | 864 | * |
d063d709 DG |
865 | * Features supported in this thread: |
866 | * -) CPU Hotplug | |
7a485870 DG |
867 | */ |
868 | static void *thread_manage_kernel(void *data) | |
869 | { | |
5eb91c98 DG |
870 | int ret, i, pollfd, update_poll_flag = 1; |
871 | uint32_t revents, nb_fd; | |
7a485870 | 872 | char tmp; |
5eb91c98 | 873 | struct lttng_poll_event events; |
7a485870 DG |
874 | |
875 | DBG("Thread manage kernel started"); | |
876 | ||
5eb91c98 DG |
877 | ret = create_thread_poll_set(&events, 2); |
878 | if (ret < 0) { | |
76d7553f | 879 | goto error_poll_create; |
5eb91c98 DG |
880 | } |
881 | ||
882 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
883 | if (ret < 0) { | |
884 | goto error; | |
885 | } | |
886 | ||
7a485870 DG |
887 | while (1) { |
888 | if (update_poll_flag == 1) { | |
5f822d0a DG |
889 | /* |
890 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
891 | * quit pipe and the kernel pipe. | |
892 | */ | |
893 | events.nb_fd = 2; | |
894 | ||
5eb91c98 DG |
895 | ret = update_kernel_poll(&events); |
896 | if (ret < 0) { | |
7a485870 DG |
897 | goto error; |
898 | } | |
899 | update_poll_flag = 0; | |
900 | } | |
901 | ||
5eb91c98 DG |
902 | nb_fd = LTTNG_POLL_GETNB(&events); |
903 | ||
904 | DBG("Thread kernel polling on %d fds", nb_fd); | |
905 | ||
906 | /* Zeroed the poll events */ | |
907 | lttng_poll_reset(&events); | |
7a485870 DG |
908 | |
909 | /* Poll infinite value of time */ | |
88f2b785 | 910 | restart: |
5eb91c98 | 911 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 912 | if (ret < 0) { |
88f2b785 MD |
913 | /* |
914 | * Restart interrupted system call. | |
915 | */ | |
916 | if (errno == EINTR) { | |
917 | goto restart; | |
918 | } | |
7a485870 DG |
919 | goto error; |
920 | } else if (ret == 0) { | |
921 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
922 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
923 | "This should not have happened! Continuing..."); | |
7a485870 DG |
924 | continue; |
925 | } | |
926 | ||
5eb91c98 DG |
927 | for (i = 0; i < nb_fd; i++) { |
928 | /* Fetch once the poll data */ | |
929 | revents = LTTNG_POLL_GETEV(&events, i); | |
930 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 931 | |
5eb91c98 DG |
932 | /* Thread quit pipe has been closed. Killing thread. */ |
933 | ret = check_thread_quit_pipe(pollfd, revents); | |
934 | if (ret) { | |
935 | goto error; | |
936 | } | |
7a485870 | 937 | |
5eb91c98 DG |
938 | /* Check for data on kernel pipe */ |
939 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
940 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
941 | update_poll_flag = 1; | |
942 | continue; | |
943 | } else { | |
944 | /* | |
945 | * New CPU detected by the kernel. Adding kernel stream to | |
946 | * kernel session and updating the kernel consumer | |
947 | */ | |
948 | if (revents & LPOLLIN) { | |
2bdd86d4 | 949 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
950 | if (ret < 0) { |
951 | continue; | |
952 | } | |
953 | break; | |
954 | /* | |
955 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
956 | * and unregister kernel stream at this point. | |
957 | */ | |
7a485870 | 958 | } |
7a485870 DG |
959 | } |
960 | } | |
961 | } | |
962 | ||
963 | error: | |
5eb91c98 | 964 | lttng_poll_clean(&events); |
76d7553f MD |
965 | error_poll_create: |
966 | DBG("Kernel thread dying"); | |
7a485870 DG |
967 | return NULL; |
968 | } | |
969 | ||
1d4b027a | 970 | /* |
3bd1e081 | 971 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 972 | */ |
3bd1e081 | 973 | static void *thread_manage_consumer(void *data) |
1d4b027a | 974 | { |
76d7553f | 975 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 976 | uint32_t revents, nb_fd; |
1d4b027a | 977 | enum lttcomm_return_code code; |
5eb91c98 | 978 | struct lttng_poll_event events; |
3bd1e081 | 979 | struct consumer_data *consumer_data = data; |
1d4b027a | 980 | |
3bd1e081 | 981 | DBG("[thread] Manage consumer started"); |
1d4b027a | 982 | |
3bd1e081 | 983 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 984 | if (ret < 0) { |
76d7553f | 985 | goto error_listen; |
1d4b027a DG |
986 | } |
987 | ||
5eb91c98 DG |
988 | /* |
989 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
990 | * Nothing more will be added to this poll set. | |
991 | */ | |
992 | ret = create_thread_poll_set(&events, 2); | |
993 | if (ret < 0) { | |
76d7553f | 994 | goto error_poll; |
5eb91c98 | 995 | } |
273ea72c | 996 | |
3bd1e081 | 997 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
998 | if (ret < 0) { |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
1003 | |
1004 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1005 | restart: |
5eb91c98 | 1006 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1007 | if (ret < 0) { |
88f2b785 MD |
1008 | /* |
1009 | * Restart interrupted system call. | |
1010 | */ | |
1011 | if (errno == EINTR) { | |
1012 | goto restart; | |
1013 | } | |
273ea72c DG |
1014 | goto error; |
1015 | } | |
1016 | ||
5eb91c98 DG |
1017 | for (i = 0; i < nb_fd; i++) { |
1018 | /* Fetch once the poll data */ | |
1019 | revents = LTTNG_POLL_GETEV(&events, i); | |
1020 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1021 | ||
1022 | /* Thread quit pipe has been closed. Killing thread. */ | |
1023 | ret = check_thread_quit_pipe(pollfd, revents); | |
1024 | if (ret) { | |
1025 | goto error; | |
1026 | } | |
1027 | ||
1028 | /* Event on the registration socket */ | |
3bd1e081 | 1029 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1030 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1031 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1032 | goto error; |
1033 | } | |
1034 | } | |
273ea72c DG |
1035 | } |
1036 | ||
3bd1e081 | 1037 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1038 | if (sock < 0) { |
1039 | goto error; | |
1040 | } | |
1041 | ||
3bd1e081 | 1042 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1043 | |
712ea556 | 1044 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1045 | ret = lttcomm_recv_unix_sock(sock, &code, |
1046 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1047 | if (ret <= 0) { |
1048 | goto error; | |
1049 | } | |
1050 | ||
3bd1e081 MD |
1051 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1052 | consumer_data->cmd_sock = | |
1053 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1054 | if (consumer_data->cmd_sock < 0) { | |
1055 | sem_post(&consumer_data->sem); | |
48842b30 | 1056 | PERROR("consumer connect"); |
1d4b027a DG |
1057 | goto error; |
1058 | } | |
1059 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1060 | sem_post(&consumer_data->sem); |
1061 | DBG("consumer command socket ready"); | |
1d4b027a | 1062 | } else { |
3bd1e081 | 1063 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1064 | lttcomm_get_readable_code(-code)); |
1065 | goto error; | |
1066 | } | |
1067 | ||
54d01ffb | 1068 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1069 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1070 | if (ret < 0) { |
72079cae DG |
1071 | goto error; |
1072 | } | |
1073 | ||
5eb91c98 DG |
1074 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1075 | if (ret < 0) { | |
72079cae | 1076 | goto error; |
5eb91c98 DG |
1077 | } |
1078 | ||
1079 | /* Update number of fd */ | |
1080 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1081 | ||
1082 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1083 | restart_poll: |
5eb91c98 DG |
1084 | ret = lttng_poll_wait(&events, -1); |
1085 | if (ret < 0) { | |
88f2b785 MD |
1086 | /* |
1087 | * Restart interrupted system call. | |
1088 | */ | |
1089 | if (errno == EINTR) { | |
1090 | goto restart_poll; | |
1091 | } | |
72079cae DG |
1092 | goto error; |
1093 | } | |
1094 | ||
5eb91c98 DG |
1095 | for (i = 0; i < nb_fd; i++) { |
1096 | /* Fetch once the poll data */ | |
1097 | revents = LTTNG_POLL_GETEV(&events, i); | |
1098 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1099 | ||
1100 | /* Thread quit pipe has been closed. Killing thread. */ | |
1101 | ret = check_thread_quit_pipe(pollfd, revents); | |
1102 | if (ret) { | |
1103 | goto error; | |
1104 | } | |
1105 | ||
1106 | /* Event on the kconsumerd socket */ | |
1107 | if (pollfd == sock) { | |
1108 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1109 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1110 | goto error; |
1111 | } | |
1112 | } | |
1113 | } | |
1114 | ||
712ea556 | 1115 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1116 | ret = lttcomm_recv_unix_sock(sock, &code, |
1117 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1118 | if (ret <= 0) { |
3bd1e081 | 1119 | ERR("consumer closed the command socket"); |
712ea556 | 1120 | goto error; |
6f61d021 | 1121 | } |
1d4b027a | 1122 | |
3bd1e081 | 1123 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1124 | |
1d4b027a | 1125 | error: |
5c827ce0 DG |
1126 | /* Immediately set the consumerd state to stopped */ |
1127 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1128 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1129 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1130 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1131 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1132 | } else { | |
1133 | /* Code flow error... */ | |
1134 | assert(0); | |
1135 | } | |
1136 | ||
76d7553f MD |
1137 | if (consumer_data->err_sock >= 0) { |
1138 | ret = close(consumer_data->err_sock); | |
1139 | if (ret) { | |
1140 | PERROR("close"); | |
1141 | } | |
1142 | } | |
1143 | if (consumer_data->cmd_sock >= 0) { | |
1144 | ret = close(consumer_data->cmd_sock); | |
1145 | if (ret) { | |
1146 | PERROR("close"); | |
1147 | } | |
1148 | } | |
1149 | if (sock >= 0) { | |
1150 | ret = close(sock); | |
1151 | if (ret) { | |
1152 | PERROR("close"); | |
1153 | } | |
1154 | } | |
273ea72c | 1155 | |
3bd1e081 MD |
1156 | unlink(consumer_data->err_unix_sock_path); |
1157 | unlink(consumer_data->cmd_unix_sock_path); | |
1158 | consumer_data->pid = 0; | |
1d4b027a | 1159 | |
5eb91c98 | 1160 | lttng_poll_clean(&events); |
76d7553f MD |
1161 | error_poll: |
1162 | error_listen: | |
1163 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1164 | |
5eb91c98 | 1165 | return NULL; |
099e26bd DG |
1166 | } |
1167 | ||
099e26bd DG |
1168 | /* |
1169 | * This thread manage application communication. | |
1d4b027a DG |
1170 | */ |
1171 | static void *thread_manage_apps(void *data) | |
099e26bd | 1172 | { |
5eb91c98 DG |
1173 | int i, ret, pollfd; |
1174 | uint32_t revents, nb_fd; | |
099e26bd | 1175 | struct ust_command ust_cmd; |
5eb91c98 | 1176 | struct lttng_poll_event events; |
099e26bd DG |
1177 | |
1178 | DBG("[thread] Manage application started"); | |
1179 | ||
f6a9efaa DG |
1180 | rcu_register_thread(); |
1181 | rcu_thread_online(); | |
1182 | ||
5eb91c98 DG |
1183 | ret = create_thread_poll_set(&events, 2); |
1184 | if (ret < 0) { | |
76d7553f | 1185 | goto error_poll_create; |
5eb91c98 | 1186 | } |
099e26bd | 1187 | |
5eb91c98 DG |
1188 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1189 | if (ret < 0) { | |
1190 | goto error; | |
1191 | } | |
099e26bd | 1192 | |
5eb91c98 DG |
1193 | while (1) { |
1194 | /* Zeroed the events structure */ | |
1195 | lttng_poll_reset(&events); | |
0177d773 | 1196 | |
5eb91c98 | 1197 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1198 | |
1199 | DBG("Apps thread polling on %d fds", nb_fd); | |
1200 | ||
1201 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1202 | restart: |
5eb91c98 | 1203 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1204 | if (ret < 0) { |
88f2b785 MD |
1205 | /* |
1206 | * Restart interrupted system call. | |
1207 | */ | |
1208 | if (errno == EINTR) { | |
1209 | goto restart; | |
1210 | } | |
099e26bd DG |
1211 | goto error; |
1212 | } | |
1213 | ||
5eb91c98 DG |
1214 | for (i = 0; i < nb_fd; i++) { |
1215 | /* Fetch once the poll data */ | |
1216 | revents = LTTNG_POLL_GETEV(&events, i); | |
1217 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1218 | ||
1219 | /* Thread quit pipe has been closed. Killing thread. */ | |
1220 | ret = check_thread_quit_pipe(pollfd, revents); | |
1221 | if (ret) { | |
099e26bd | 1222 | goto error; |
5eb91c98 | 1223 | } |
099e26bd | 1224 | |
5eb91c98 DG |
1225 | /* Inspect the apps cmd pipe */ |
1226 | if (pollfd == apps_cmd_pipe[0]) { | |
1227 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1228 | ERR("Apps command pipe error"); | |
0177d773 | 1229 | goto error; |
5eb91c98 DG |
1230 | } else if (revents & LPOLLIN) { |
1231 | /* Empty pipe */ | |
1232 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1233 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1234 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1235 | goto error; |
1236 | } | |
099e26bd | 1237 | |
5eb91c98 | 1238 | /* Register applicaton to the session daemon */ |
56fff090 | 1239 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1240 | ust_cmd.sock); |
88ff5b7f | 1241 | if (ret == -ENOMEM) { |
5eb91c98 | 1242 | goto error; |
88ff5b7f MD |
1243 | } else if (ret < 0) { |
1244 | break; | |
5eb91c98 DG |
1245 | } |
1246 | ||
acc7b41b | 1247 | /* |
e0c7ec2b | 1248 | * Validate UST version compatibility. |
acc7b41b | 1249 | */ |
e0c7ec2b DG |
1250 | ret = ust_app_validate_version(ust_cmd.sock); |
1251 | if (ret >= 0) { | |
1252 | /* | |
1253 | * Add channel(s) and event(s) to newly registered apps | |
1254 | * from lttng global UST domain. | |
1255 | */ | |
1256 | update_ust_app(ust_cmd.sock); | |
1257 | } | |
acc7b41b | 1258 | |
f2ca2e25 | 1259 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1260 | if (ret < 0) { |
1261 | /* | |
1262 | * If the registration is not possible, we simply | |
1263 | * unregister the apps and continue | |
1264 | */ | |
56fff090 | 1265 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1266 | } else { |
1267 | /* | |
1268 | * We just need here to monitor the close of the UST | |
1269 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1270 | * Listen on POLLIN (even if we never expect any |
1271 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1272 | */ |
a9ade966 | 1273 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1274 | if (ret < 0) { |
1275 | goto error; | |
1276 | } | |
1277 | ||
54d01ffb DG |
1278 | DBG("Apps with sock %d added to poll set", |
1279 | ust_cmd.sock); | |
5eb91c98 | 1280 | } |
487cf67c | 1281 | |
5eb91c98 | 1282 | break; |
0177d773 | 1283 | } |
5eb91c98 DG |
1284 | } else { |
1285 | /* | |
54d01ffb DG |
1286 | * At this point, we know that a registered application made |
1287 | * the event at poll_wait. | |
5eb91c98 DG |
1288 | */ |
1289 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1290 | /* Removing from the poll set */ | |
1291 | ret = lttng_poll_del(&events, pollfd); | |
1292 | if (ret < 0) { | |
1293 | goto error; | |
1294 | } | |
099e26bd | 1295 | |
b9d9b220 | 1296 | /* Socket closed on remote end. */ |
56fff090 | 1297 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1298 | break; |
1299 | } | |
099e26bd DG |
1300 | } |
1301 | } | |
099e26bd DG |
1302 | } |
1303 | ||
1304 | error: | |
5eb91c98 | 1305 | lttng_poll_clean(&events); |
76d7553f MD |
1306 | error_poll_create: |
1307 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1308 | rcu_thread_offline(); |
1309 | rcu_unregister_thread(); | |
099e26bd DG |
1310 | return NULL; |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Dispatch request from the registration threads to the application | |
1315 | * communication thread. | |
1316 | */ | |
1317 | static void *thread_dispatch_ust_registration(void *data) | |
1318 | { | |
1319 | int ret; | |
1320 | struct cds_wfq_node *node; | |
1321 | struct ust_command *ust_cmd = NULL; | |
1322 | ||
1323 | DBG("[thread] Dispatch UST command started"); | |
1324 | ||
1325 | while (!dispatch_thread_exit) { | |
1326 | /* Atomically prepare the queue futex */ | |
1327 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1328 | ||
1329 | do { | |
1330 | /* Dequeue command for registration */ | |
1331 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1332 | if (node == NULL) { | |
00a17c97 | 1333 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1334 | /* Continue thread execution */ |
1335 | break; | |
1336 | } | |
1337 | ||
1338 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1339 | ||
2f50c8a3 DG |
1340 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1341 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1342 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1343 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1344 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1345 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1346 | /* |
1347 | * Inform apps thread of the new application registration. This | |
1348 | * call is blocking so we can be assured that the data will be read | |
1349 | * at some point in time or wait to the end of the world :) | |
1350 | */ | |
1351 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1352 | sizeof(struct ust_command)); | |
1353 | if (ret < 0) { | |
76d7553f | 1354 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1355 | if (errno == EBADF) { |
1356 | /* | |
1357 | * We can't inform the application thread to process | |
1358 | * registration. We will exit or else application | |
1359 | * registration will not occur and tracing will never | |
1360 | * start. | |
1361 | */ | |
1362 | goto error; | |
1363 | } | |
1364 | } | |
1365 | free(ust_cmd); | |
1366 | } while (node != NULL); | |
1367 | ||
1368 | /* Futex wait on queue. Blocking call on futex() */ | |
1369 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1370 | } | |
1371 | ||
1372 | error: | |
1373 | DBG("Dispatch thread dying"); | |
1374 | return NULL; | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * This thread manage application registration. | |
1379 | */ | |
1380 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1381 | { |
a4b35e07 | 1382 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1383 | uint32_t revents, nb_fd; |
1384 | struct lttng_poll_event events; | |
099e26bd DG |
1385 | /* |
1386 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1387 | * freed in the manage apps thread. | |
1388 | */ | |
1389 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1390 | |
099e26bd | 1391 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1392 | |
1393 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1394 | if (ret < 0) { | |
76d7553f | 1395 | goto error_listen; |
1d4b027a DG |
1396 | } |
1397 | ||
5eb91c98 DG |
1398 | /* |
1399 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1400 | * more will be added to this poll set. | |
1401 | */ | |
1402 | ret = create_thread_poll_set(&events, 2); | |
1403 | if (ret < 0) { | |
76d7553f | 1404 | goto error_create_poll; |
5eb91c98 | 1405 | } |
273ea72c | 1406 | |
5eb91c98 DG |
1407 | /* Add the application registration socket */ |
1408 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1409 | if (ret < 0) { | |
76d7553f | 1410 | goto error_poll_add; |
5eb91c98 | 1411 | } |
273ea72c | 1412 | |
1d4b027a | 1413 | /* Notify all applications to register */ |
0fdd1e2c DG |
1414 | ret = notify_ust_apps(1); |
1415 | if (ret < 0) { | |
1416 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1417 | "Execution continues but there might be problem for already\n" |
1418 | "running applications that wishes to register."); | |
0fdd1e2c | 1419 | } |
1d4b027a DG |
1420 | |
1421 | while (1) { | |
1422 | DBG("Accepting application registration"); | |
273ea72c | 1423 | |
5eb91c98 DG |
1424 | nb_fd = LTTNG_POLL_GETNB(&events); |
1425 | ||
273ea72c | 1426 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1427 | restart: |
5eb91c98 | 1428 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1429 | if (ret < 0) { |
88f2b785 MD |
1430 | /* |
1431 | * Restart interrupted system call. | |
1432 | */ | |
1433 | if (errno == EINTR) { | |
1434 | goto restart; | |
1435 | } | |
273ea72c DG |
1436 | goto error; |
1437 | } | |
1438 | ||
5eb91c98 DG |
1439 | for (i = 0; i < nb_fd; i++) { |
1440 | /* Fetch once the poll data */ | |
1441 | revents = LTTNG_POLL_GETEV(&events, i); | |
1442 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1443 | |
5eb91c98 DG |
1444 | /* Thread quit pipe has been closed. Killing thread. */ |
1445 | ret = check_thread_quit_pipe(pollfd, revents); | |
1446 | if (ret) { | |
90014c57 DG |
1447 | goto error; |
1448 | } | |
1d4b027a | 1449 | |
5eb91c98 DG |
1450 | /* Event on the registration socket */ |
1451 | if (pollfd == apps_sock) { | |
1452 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1453 | ERR("Register apps socket poll error"); | |
1454 | goto error; | |
1455 | } else if (revents & LPOLLIN) { | |
1456 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1457 | if (sock < 0) { | |
1458 | goto error; | |
1459 | } | |
099e26bd | 1460 | |
5eb91c98 | 1461 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1462 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1463 | if (ust_cmd == NULL) { |
76d7553f | 1464 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1465 | goto error; |
1466 | } | |
1d4b027a | 1467 | |
5eb91c98 DG |
1468 | /* |
1469 | * Using message-based transmissions to ensure we don't | |
1470 | * have to deal with partially received messages. | |
1471 | */ | |
4063050c MD |
1472 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1473 | if (ret < 0) { | |
1474 | ERR("Exhausted file descriptors allowed for applications."); | |
1475 | free(ust_cmd); | |
1476 | ret = close(sock); | |
1477 | if (ret) { | |
1478 | PERROR("close"); | |
1479 | } | |
1480 | sock = -1; | |
1481 | continue; | |
1482 | } | |
5eb91c98 DG |
1483 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1484 | sizeof(struct ust_register_msg)); | |
1485 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1486 | if (ret < 0) { | |
76d7553f | 1487 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1488 | } else { |
1489 | ERR("Wrong size received on apps register"); | |
1490 | } | |
1491 | free(ust_cmd); | |
76d7553f MD |
1492 | ret = close(sock); |
1493 | if (ret) { | |
1494 | PERROR("close"); | |
1495 | } | |
4063050c | 1496 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1497 | sock = -1; |
5eb91c98 DG |
1498 | continue; |
1499 | } | |
099e26bd | 1500 | |
5eb91c98 | 1501 | ust_cmd->sock = sock; |
34a2494f | 1502 | sock = -1; |
099e26bd | 1503 | |
5eb91c98 DG |
1504 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1505 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1506 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1507 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1508 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1509 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1510 | |
5eb91c98 DG |
1511 | /* |
1512 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1513 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1514 | */ |
1515 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1516 | ||
1517 | /* | |
1518 | * Wake the registration queue futex. Implicit memory | |
1519 | * barrier with the exchange in cds_wfq_enqueue. | |
1520 | */ | |
1521 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1522 | } | |
1523 | } | |
90014c57 | 1524 | } |
1d4b027a DG |
1525 | } |
1526 | ||
1527 | error: | |
0fdd1e2c DG |
1528 | /* Notify that the registration thread is gone */ |
1529 | notify_ust_apps(0); | |
1530 | ||
a4b35e07 | 1531 | if (apps_sock >= 0) { |
76d7553f MD |
1532 | ret = close(apps_sock); |
1533 | if (ret) { | |
1534 | PERROR("close"); | |
1535 | } | |
a4b35e07 | 1536 | } |
46c3f085 | 1537 | if (sock >= 0) { |
76d7553f MD |
1538 | ret = close(sock); |
1539 | if (ret) { | |
1540 | PERROR("close"); | |
1541 | } | |
4063050c | 1542 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1543 | } |
273ea72c | 1544 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1545 | |
76d7553f | 1546 | error_poll_add: |
5eb91c98 | 1547 | lttng_poll_clean(&events); |
76d7553f MD |
1548 | error_listen: |
1549 | error_create_poll: | |
1550 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1551 | |
1d4b027a DG |
1552 | return NULL; |
1553 | } | |
1554 | ||
8c0faa1d | 1555 | /* |
3bd1e081 | 1556 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1557 | * exec or it will fails. |
8c0faa1d | 1558 | */ |
3bd1e081 | 1559 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1560 | { |
1561 | int ret; | |
ee0b0061 DG |
1562 | struct timespec timeout; |
1563 | ||
1564 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1565 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1566 | |
1567 | /* Setup semaphore */ | |
3bd1e081 | 1568 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1569 | if (ret < 0) { |
3bd1e081 | 1570 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1571 | goto error; |
1572 | } | |
8c0faa1d | 1573 | |
3bd1e081 MD |
1574 | ret = pthread_create(&consumer_data->thread, NULL, |
1575 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1576 | if (ret != 0) { |
3bd1e081 | 1577 | PERROR("pthread_create consumer"); |
ee0b0061 | 1578 | ret = -1; |
8c0faa1d DG |
1579 | goto error; |
1580 | } | |
1581 | ||
ee0b0061 DG |
1582 | /* Get time for sem_timedwait absolute timeout */ |
1583 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1584 | if (ret < 0) { | |
3bd1e081 | 1585 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1586 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1587 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1588 | } else { |
1589 | /* Normal timeout if the gettime was successful */ | |
1590 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1591 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1592 | } |
8c0faa1d | 1593 | |
ee0b0061 DG |
1594 | if (ret < 0) { |
1595 | if (errno == ETIMEDOUT) { | |
1596 | /* | |
1597 | * Call has timed out so we kill the kconsumerd_thread and return | |
1598 | * an error. | |
1599 | */ | |
3bd1e081 MD |
1600 | ERR("The consumer thread was never ready. Killing it"); |
1601 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1602 | if (ret < 0) { |
3bd1e081 | 1603 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1604 | } |
1605 | } else { | |
3bd1e081 | 1606 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1607 | } |
1608 | goto error; | |
1609 | } | |
1610 | ||
3bd1e081 MD |
1611 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1612 | if (consumer_data->pid == 0) { | |
712ea556 | 1613 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1614 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1615 | goto error; |
1616 | } | |
3bd1e081 | 1617 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1618 | |
8c0faa1d DG |
1619 | return 0; |
1620 | ||
1621 | error: | |
1622 | return ret; | |
1623 | } | |
1624 | ||
d9800920 | 1625 | /* |
3bd1e081 | 1626 | * Join consumer thread |
d9800920 | 1627 | */ |
3bd1e081 | 1628 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1629 | { |
1630 | void *status; | |
1631 | int ret; | |
1632 | ||
3bd1e081 MD |
1633 | if (consumer_data->pid != 0) { |
1634 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1635 | if (ret) { |
3bd1e081 | 1636 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1637 | return ret; |
1638 | } | |
3bd1e081 | 1639 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1640 | } else { |
1641 | return 0; | |
1642 | } | |
1643 | } | |
1644 | ||
8c0faa1d | 1645 | /* |
3bd1e081 | 1646 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1647 | * |
d063d709 | 1648 | * Return pid if successful else -1. |
8c0faa1d | 1649 | */ |
3bd1e081 | 1650 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1651 | { |
1652 | int ret; | |
1653 | pid_t pid; | |
94c55f17 | 1654 | const char *consumer_to_use; |
53086306 | 1655 | const char *verbosity; |
94c55f17 | 1656 | struct stat st; |
8c0faa1d | 1657 | |
3bd1e081 | 1658 | DBG("Spawning consumerd"); |
c49dc785 | 1659 | |
8c0faa1d DG |
1660 | pid = fork(); |
1661 | if (pid == 0) { | |
1662 | /* | |
3bd1e081 | 1663 | * Exec consumerd. |
8c0faa1d | 1664 | */ |
daee5345 | 1665 | if (opt_verbose_consumer) { |
53086306 DG |
1666 | verbosity = "--verbose"; |
1667 | } else { | |
1668 | verbosity = "--quiet"; | |
1669 | } | |
3bd1e081 MD |
1670 | switch (consumer_data->type) { |
1671 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1672 | /* |
c7704d57 DG |
1673 | * Find out which consumerd to execute. We will first try the |
1674 | * 64-bit path, then the sessiond's installation directory, and | |
1675 | * fallback on the 32-bit one, | |
94c55f17 | 1676 | */ |
63a799e8 AM |
1677 | DBG3("Looking for a kernel consumer at these locations:"); |
1678 | DBG3(" 1) %s", consumerd64_bin); | |
1679 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1680 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1681 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1682 | DBG3("Found location #1"); |
94c55f17 | 1683 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1684 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1685 | DBG3("Found location #2"); |
94c55f17 | 1686 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1687 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1688 | DBG3("Found location #3"); |
eb1e0bd4 | 1689 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1690 | } else { |
63a799e8 | 1691 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1692 | break; |
1693 | } | |
1694 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1695 | execl(consumer_to_use, | |
1696 | "lttng-consumerd", verbosity, "-k", | |
1697 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1698 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1699 | NULL); | |
3bd1e081 | 1700 | break; |
7753dea8 MD |
1701 | case LTTNG_CONSUMER64_UST: |
1702 | { | |
b1e0b6b6 | 1703 | char *tmpnew = NULL; |
8f4905da MD |
1704 | |
1705 | if (consumerd64_libdir[0] != '\0') { | |
1706 | char *tmp; | |
1707 | size_t tmplen; | |
1708 | ||
1709 | tmp = getenv("LD_LIBRARY_PATH"); | |
1710 | if (!tmp) { | |
1711 | tmp = ""; | |
1712 | } | |
1713 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1714 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1715 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1716 | if (!tmpnew) { | |
1717 | ret = -ENOMEM; | |
1718 | goto error; | |
1719 | } | |
1720 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1721 | strcat(tmpnew, consumerd64_libdir); | |
1722 | if (tmp[0] != '\0') { | |
1723 | strcat(tmpnew, ":"); | |
1724 | strcat(tmpnew, tmp); | |
1725 | } | |
1726 | ret = putenv(tmpnew); | |
1727 | if (ret) { | |
1728 | ret = -errno; | |
1729 | goto error; | |
1730 | } | |
1731 | } | |
94c55f17 | 1732 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1733 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1734 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1735 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1736 | NULL); | |
8f4905da MD |
1737 | if (consumerd64_libdir[0] != '\0') { |
1738 | free(tmpnew); | |
1739 | } | |
1740 | if (ret) { | |
1741 | goto error; | |
1742 | } | |
3bd1e081 | 1743 | break; |
7753dea8 MD |
1744 | } |
1745 | case LTTNG_CONSUMER32_UST: | |
1746 | { | |
937dde8e | 1747 | char *tmpnew = NULL; |
8f4905da MD |
1748 | |
1749 | if (consumerd32_libdir[0] != '\0') { | |
1750 | char *tmp; | |
1751 | size_t tmplen; | |
1752 | ||
1753 | tmp = getenv("LD_LIBRARY_PATH"); | |
1754 | if (!tmp) { | |
1755 | tmp = ""; | |
1756 | } | |
1757 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1758 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1759 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1760 | if (!tmpnew) { | |
1761 | ret = -ENOMEM; | |
1762 | goto error; | |
1763 | } | |
1764 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1765 | strcat(tmpnew, consumerd32_libdir); | |
1766 | if (tmp[0] != '\0') { | |
1767 | strcat(tmpnew, ":"); | |
1768 | strcat(tmpnew, tmp); | |
1769 | } | |
1770 | ret = putenv(tmpnew); | |
1771 | if (ret) { | |
1772 | ret = -errno; | |
1773 | goto error; | |
1774 | } | |
1775 | } | |
94c55f17 | 1776 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1777 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1778 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1779 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1780 | NULL); | |
8f4905da MD |
1781 | if (consumerd32_libdir[0] != '\0') { |
1782 | free(tmpnew); | |
1783 | } | |
1784 | if (ret) { | |
1785 | goto error; | |
1786 | } | |
7753dea8 MD |
1787 | break; |
1788 | } | |
3bd1e081 | 1789 | default: |
76d7553f | 1790 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1791 | exit(EXIT_FAILURE); |
1792 | } | |
8c0faa1d | 1793 | if (errno != 0) { |
76d7553f | 1794 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1795 | } |
1796 | exit(EXIT_FAILURE); | |
1797 | } else if (pid > 0) { | |
1798 | ret = pid; | |
8c0faa1d | 1799 | } else { |
76d7553f | 1800 | PERROR("start consumer fork"); |
8c0faa1d | 1801 | ret = -errno; |
8c0faa1d | 1802 | } |
8f4905da | 1803 | error: |
8c0faa1d DG |
1804 | return ret; |
1805 | } | |
1806 | ||
693bd40b | 1807 | /* |
3bd1e081 | 1808 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1809 | */ |
3bd1e081 | 1810 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1811 | { |
1812 | int ret; | |
1813 | ||
3bd1e081 MD |
1814 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1815 | if (consumer_data->pid != 0) { | |
1816 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1817 | goto end; |
1818 | } | |
693bd40b | 1819 | |
3bd1e081 | 1820 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1821 | if (ret < 0) { |
3bd1e081 MD |
1822 | ERR("Spawning consumerd failed"); |
1823 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1824 | goto error; |
693bd40b | 1825 | } |
c49dc785 | 1826 | |
3bd1e081 MD |
1827 | /* Setting up the consumer_data pid */ |
1828 | consumer_data->pid = ret; | |
48842b30 | 1829 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1830 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1831 | |
3bd1e081 MD |
1832 | DBG2("Spawning consumer control thread"); |
1833 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1834 | if (ret < 0) { |
3bd1e081 | 1835 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1836 | goto error; |
1837 | } | |
1838 | ||
c49dc785 | 1839 | end: |
693bd40b DG |
1840 | return 0; |
1841 | ||
1842 | error: | |
1843 | return ret; | |
1844 | } | |
1845 | ||
b73401da | 1846 | /* |
096102bd | 1847 | * Check version of the lttng-modules. |
b73401da | 1848 | */ |
096102bd | 1849 | static int validate_lttng_modules_version(void) |
b73401da | 1850 | { |
096102bd | 1851 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1852 | } |
1853 | ||
b73401da | 1854 | /* |
096102bd | 1855 | * Setup necessary data for kernel tracer action. |
b73401da | 1856 | */ |
096102bd | 1857 | static int init_kernel_tracer(void) |
b73401da DG |
1858 | { |
1859 | int ret; | |
b73401da | 1860 | |
096102bd DG |
1861 | /* Modprobe lttng kernel modules */ |
1862 | ret = modprobe_lttng_control(); | |
b73401da | 1863 | if (ret < 0) { |
b73401da DG |
1864 | goto error; |
1865 | } | |
1866 | ||
096102bd DG |
1867 | /* Open debugfs lttng */ |
1868 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1869 | if (kernel_tracer_fd < 0) { | |
1870 | DBG("Failed to open %s", module_proc_lttng); | |
1871 | ret = -1; | |
1872 | goto error_open; | |
b73401da DG |
1873 | } |
1874 | ||
096102bd DG |
1875 | /* Validate kernel version */ |
1876 | ret = validate_lttng_modules_version(); | |
b73401da | 1877 | if (ret < 0) { |
096102bd | 1878 | goto error_version; |
b73401da DG |
1879 | } |
1880 | ||
096102bd | 1881 | ret = modprobe_lttng_data(); |
b73401da | 1882 | if (ret < 0) { |
096102bd | 1883 | goto error_modules; |
8c0faa1d DG |
1884 | } |
1885 | ||
f3ed775e | 1886 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1887 | return 0; |
1888 | ||
1889 | error_version: | |
1890 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1891 | ret = close(kernel_tracer_fd); |
1892 | if (ret) { | |
1893 | PERROR("close"); | |
1894 | } | |
1895 | kernel_tracer_fd = -1; | |
096102bd DG |
1896 | return LTTCOMM_KERN_VERSION; |
1897 | ||
1898 | error_modules: | |
76d7553f MD |
1899 | ret = close(kernel_tracer_fd); |
1900 | if (ret) { | |
1901 | PERROR("close"); | |
1902 | } | |
096102bd DG |
1903 | |
1904 | error_open: | |
1905 | modprobe_remove_lttng_control(); | |
b73401da DG |
1906 | |
1907 | error: | |
b73401da | 1908 | WARN("No kernel tracer available"); |
a4b35e07 | 1909 | kernel_tracer_fd = -1; |
531d29f9 MD |
1910 | if (!is_root) { |
1911 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1912 | } else { | |
1913 | return LTTCOMM_KERN_NA; | |
1914 | } | |
f3ed775e | 1915 | } |
33a2b854 | 1916 | |
f3ed775e | 1917 | /* |
54d01ffb | 1918 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1919 | */ |
54d01ffb | 1920 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1921 | { |
f40799e8 | 1922 | int ret = 0; |
8c0faa1d | 1923 | |
3bd1e081 | 1924 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1925 | /* |
54d01ffb | 1926 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1927 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1928 | * an extra security check. |
d9800920 | 1929 | */ |
03550b58 | 1930 | if (session->consumer_fd < 0) { |
3bd1e081 | 1931 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1932 | } |
1933 | ||
2bdd86d4 | 1934 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1935 | if (ret < 0) { |
f3ed775e DG |
1936 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1937 | goto error; | |
1938 | } | |
1d4b027a | 1939 | |
3bd1e081 | 1940 | session->consumer_fds_sent = 1; |
f3ed775e | 1941 | } |
1d4b027a DG |
1942 | |
1943 | error: | |
1944 | return ret; | |
8c0faa1d DG |
1945 | } |
1946 | ||
0177d773 DG |
1947 | /* |
1948 | * Create an UST session and add it to the session ust list. | |
1949 | */ | |
44d3bd01 | 1950 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1951 | struct lttng_domain *domain) |
0177d773 | 1952 | { |
13384287 | 1953 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1954 | int ret; |
44d3bd01 DG |
1955 | |
1956 | switch (domain->type) { | |
48842b30 | 1957 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1958 | break; |
1959 | default: | |
13384287 | 1960 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1961 | goto error; |
1962 | } | |
0177d773 DG |
1963 | |
1964 | DBG("Creating UST session"); | |
1965 | ||
a991f516 | 1966 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1967 | if (lus == NULL) { |
44d3bd01 | 1968 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1969 | goto error; |
1970 | } | |
1971 | ||
e11d277b | 1972 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1973 | session->uid, session->gid); |
0177d773 DG |
1974 | if (ret < 0) { |
1975 | if (ret != -EEXIST) { | |
1976 | ERR("Trace directory creation error"); | |
44d3bd01 | 1977 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1978 | goto error; |
1979 | } | |
1980 | } | |
1981 | ||
f6a9efaa DG |
1982 | /* The domain type dictate different actions on session creation */ |
1983 | switch (domain->type) { | |
48842b30 DG |
1984 | case LTTNG_DOMAIN_UST: |
1985 | /* No ustctl for the global UST domain */ | |
1986 | break; | |
1987 | default: | |
36dc12cc | 1988 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1989 | goto error; |
0177d773 | 1990 | } |
6df2e2c9 MD |
1991 | lus->uid = session->uid; |
1992 | lus->gid = session->gid; | |
f6a9efaa | 1993 | session->ust_session = lus; |
44d3bd01 DG |
1994 | |
1995 | return LTTCOMM_OK; | |
0177d773 DG |
1996 | |
1997 | error: | |
1998 | free(lus); | |
1999 | return ret; | |
2000 | } | |
2001 | ||
333f285e | 2002 | /* |
d063d709 | 2003 | * Create a kernel tracer session then create the default channel. |
333f285e | 2004 | */ |
6df2e2c9 | 2005 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2006 | { |
f3ed775e | 2007 | int ret; |
f3ed775e DG |
2008 | |
2009 | DBG("Creating kernel session"); | |
2010 | ||
2011 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2012 | if (ret < 0) { | |
2013 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2014 | goto error; | |
333f285e DG |
2015 | } |
2016 | ||
d9800920 | 2017 | /* Set kernel consumer socket fd */ |
03550b58 | 2018 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 2019 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
2020 | } |
2021 | ||
e11d277b | 2022 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 2023 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2024 | if (ret < 0) { |
996b65c8 | 2025 | if (ret != -EEXIST) { |
7a485870 DG |
2026 | ERR("Trace directory creation error"); |
2027 | goto error; | |
2028 | } | |
2029 | } | |
6df2e2c9 MD |
2030 | session->kernel_session->uid = session->uid; |
2031 | session->kernel_session->gid = session->gid; | |
7a485870 | 2032 | |
f3ed775e DG |
2033 | error: |
2034 | return ret; | |
333f285e DG |
2035 | } |
2036 | ||
8e0af1b4 | 2037 | /* |
c7704d57 DG |
2038 | * Check if the UID or GID match the session. Root user has access to all |
2039 | * sessions. | |
8e0af1b4 | 2040 | */ |
c7704d57 | 2041 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 2042 | { |
c7704d57 | 2043 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2044 | return 0; |
2045 | } else { | |
2046 | return 1; | |
2047 | } | |
2048 | } | |
2049 | ||
2050 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2051 | { | |
2052 | unsigned int i = 0; | |
2053 | struct ltt_session *session; | |
2054 | ||
2055 | DBG("Counting number of available session for UID %d GID %d", | |
2056 | uid, gid); | |
2057 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2058 | /* | |
2059 | * Only list the sessions the user can control. | |
2060 | */ | |
2061 | if (!session_access_ok(session, uid, gid)) { | |
2062 | continue; | |
2063 | } | |
2064 | i++; | |
2065 | } | |
2066 | return i; | |
2067 | } | |
2068 | ||
6c9cc2ab DG |
2069 | /* |
2070 | * Using the session list, filled a lttng_session array to send back to the | |
2071 | * client for session listing. | |
2072 | * | |
2073 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2074 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2075 | */ |
c7704d57 DG |
2076 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2077 | gid_t gid) | |
6c9cc2ab | 2078 | { |
8e0af1b4 | 2079 | unsigned int i = 0; |
6c9cc2ab DG |
2080 | struct ltt_session *session; |
2081 | ||
8e0af1b4 MD |
2082 | DBG("Getting all available session for UID %d GID %d", |
2083 | uid, gid); | |
6c9cc2ab DG |
2084 | /* |
2085 | * Iterate over session list and append data after the control struct in | |
2086 | * the buffer. | |
2087 | */ | |
2088 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2089 | /* |
2090 | * Only list the sessions the user can control. | |
2091 | */ | |
2092 | if (!session_access_ok(session, uid, gid)) { | |
2093 | continue; | |
2094 | } | |
6c9cc2ab | 2095 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2096 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2097 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2098 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2099 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2100 | i++; |
2101 | } | |
2102 | } | |
2103 | ||
9f19cc17 DG |
2104 | /* |
2105 | * Fill lttng_channel array of all channels. | |
2106 | */ | |
b551a063 | 2107 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2108 | struct lttng_channel *channels) |
2109 | { | |
2110 | int i = 0; | |
2111 | struct ltt_kernel_channel *kchan; | |
2112 | ||
2113 | DBG("Listing channels for session %s", session->name); | |
2114 | ||
b551a063 DG |
2115 | switch (domain) { |
2116 | case LTTNG_DOMAIN_KERNEL: | |
2117 | /* Kernel channels */ | |
2118 | if (session->kernel_session != NULL) { | |
2119 | cds_list_for_each_entry(kchan, | |
2120 | &session->kernel_session->channel_list.head, list) { | |
2121 | /* Copy lttng_channel struct to array */ | |
2122 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2123 | channels[i].enabled = kchan->enabled; | |
2124 | i++; | |
2125 | } | |
2126 | } | |
2127 | break; | |
2128 | case LTTNG_DOMAIN_UST: | |
2129 | { | |
bec39940 | 2130 | struct lttng_ht_iter iter; |
b551a063 DG |
2131 | struct ltt_ust_channel *uchan; |
2132 | ||
bec39940 DG |
2133 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2134 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2135 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2136 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2137 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2138 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2139 | channels[i].attr.switch_timer_interval = | |
2140 | uchan->attr.switch_timer_interval; | |
2141 | channels[i].attr.read_timer_interval = | |
2142 | uchan->attr.read_timer_interval; | |
aea829b3 | 2143 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2144 | switch (uchan->attr.output) { |
2145 | case LTTNG_UST_MMAP: | |
2146 | default: | |
2147 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2148 | break; | |
2149 | } | |
befe0905 | 2150 | i++; |
b551a063 DG |
2151 | } |
2152 | break; | |
2153 | } | |
2154 | default: | |
2155 | break; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * Create a list of ust global domain events. | |
2161 | */ | |
2162 | static int list_lttng_ust_global_events(char *channel_name, | |
2163 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2164 | { | |
2165 | int i = 0, ret = 0; | |
2166 | unsigned int nb_event = 0; | |
bec39940 DG |
2167 | struct lttng_ht_iter iter; |
2168 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2169 | struct ltt_ust_channel *uchan; |
2170 | struct ltt_ust_event *uevent; | |
2171 | struct lttng_event *tmp; | |
2172 | ||
2173 | DBG("Listing UST global events for channel %s", channel_name); | |
2174 | ||
2175 | rcu_read_lock(); | |
2176 | ||
bec39940 DG |
2177 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2178 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2179 | if (node == NULL) { |
2180 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2181 | goto error; | |
b551a063 DG |
2182 | } |
2183 | ||
bec39940 | 2184 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2185 | |
bec39940 | 2186 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2187 | |
b551a063 DG |
2188 | if (nb_event == 0) { |
2189 | ret = nb_event; | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | DBG3("Listing UST global %d events", nb_event); | |
2194 | ||
2195 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2196 | if (tmp == NULL) { | |
2197 | ret = -LTTCOMM_FATAL; | |
2198 | goto error; | |
2199 | } | |
2200 | ||
bec39940 | 2201 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2202 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2203 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2204 | tmp[i].enabled = uevent->enabled; | |
2205 | switch (uevent->attr.instrumentation) { | |
2206 | case LTTNG_UST_TRACEPOINT: | |
2207 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2208 | break; | |
2209 | case LTTNG_UST_PROBE: | |
2210 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2211 | break; | |
2212 | case LTTNG_UST_FUNCTION: | |
2213 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2214 | break; | |
0cda4f28 | 2215 | } |
8005f29a | 2216 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2217 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2218 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2219 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2220 | break; |
8005f29a | 2221 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2222 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2223 | break; |
2224 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2225 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2226 | break; |
9f19cc17 | 2227 | } |
d7b75b30 | 2228 | i++; |
9f19cc17 DG |
2229 | } |
2230 | ||
b551a063 DG |
2231 | ret = nb_event; |
2232 | *events = tmp; | |
2233 | ||
2234 | error: | |
2235 | rcu_read_unlock(); | |
2236 | return ret; | |
9f19cc17 DG |
2237 | } |
2238 | ||
2239 | /* | |
b551a063 | 2240 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2241 | */ |
b551a063 DG |
2242 | static int list_lttng_kernel_events(char *channel_name, |
2243 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2244 | { |
b551a063 DG |
2245 | int i = 0, ret; |
2246 | unsigned int nb_event; | |
9f19cc17 | 2247 | struct ltt_kernel_event *event; |
b551a063 DG |
2248 | struct ltt_kernel_channel *kchan; |
2249 | ||
2250 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2251 | if (kchan == NULL) { | |
2252 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2253 | goto error; | |
2254 | } | |
2255 | ||
2256 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2257 | |
2258 | DBG("Listing events for channel %s", kchan->channel->name); | |
2259 | ||
b551a063 DG |
2260 | if (nb_event == 0) { |
2261 | ret = nb_event; | |
2262 | goto error; | |
2263 | } | |
2264 | ||
2265 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2266 | if (*events == NULL) { | |
2267 | ret = LTTCOMM_FATAL; | |
2268 | goto error; | |
2269 | } | |
2270 | ||
9f19cc17 DG |
2271 | /* Kernel channels */ |
2272 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2273 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2274 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2275 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2276 | switch (event->event->instrumentation) { |
2277 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2278 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2279 | break; |
2280 | case LTTNG_KERNEL_KPROBE: | |
2281 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2282 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2283 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2284 | sizeof(struct lttng_kernel_kprobe)); |
2285 | break; | |
2286 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2287 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2288 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2289 | sizeof(struct lttng_kernel_function)); |
2290 | break; | |
0133c199 | 2291 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2292 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2293 | break; |
a54bd42d | 2294 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2295 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2296 | break; |
7a3d1328 MD |
2297 | case LTTNG_KERNEL_ALL: |
2298 | assert(0); | |
2299 | break; | |
9f19cc17 DG |
2300 | } |
2301 | i++; | |
2302 | } | |
b551a063 DG |
2303 | |
2304 | return nb_event; | |
2305 | ||
2306 | error: | |
2307 | return ret; | |
9f19cc17 DG |
2308 | } |
2309 | ||
fac6795d | 2310 | /* |
54d01ffb | 2311 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2312 | */ |
54d01ffb DG |
2313 | static int cmd_disable_channel(struct ltt_session *session, |
2314 | int domain, char *channel_name) | |
fac6795d | 2315 | { |
54d01ffb | 2316 | int ret; |
78f0bacd DG |
2317 | struct ltt_ust_session *usess; |
2318 | ||
2319 | usess = session->ust_session; | |
379473d2 | 2320 | |
54d01ffb | 2321 | switch (domain) { |
78f0bacd DG |
2322 | case LTTNG_DOMAIN_KERNEL: |
2323 | { | |
2324 | ret = channel_kernel_disable(session->kernel_session, | |
2325 | channel_name); | |
2326 | if (ret != LTTCOMM_OK) { | |
2327 | goto error; | |
2328 | } | |
54d01ffb | 2329 | |
78f0bacd DG |
2330 | kernel_wait_quiescent(kernel_tracer_fd); |
2331 | break; | |
2332 | } | |
2333 | case LTTNG_DOMAIN_UST: | |
2334 | { | |
2335 | struct ltt_ust_channel *uchan; | |
bec39940 | 2336 | struct lttng_ht *chan_ht; |
78f0bacd | 2337 | |
7885e399 DG |
2338 | chan_ht = usess->domain_global.channels; |
2339 | ||
2340 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2341 | if (uchan == NULL) { |
2342 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2343 | goto error; |
78f0bacd DG |
2344 | } |
2345 | ||
7885e399 DG |
2346 | ret = channel_ust_disable(usess, domain, uchan); |
2347 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2348 | goto error; |
2349 | } | |
78f0bacd DG |
2350 | break; |
2351 | } | |
d78d6610 | 2352 | #if 0 |
78f0bacd DG |
2353 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2354 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2355 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2356 | #endif |
78f0bacd DG |
2357 | default: |
2358 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2359 | goto error; | |
20fe2104 DG |
2360 | } |
2361 | ||
54d01ffb | 2362 | ret = LTTCOMM_OK; |
d65106b1 | 2363 | |
54d01ffb DG |
2364 | error: |
2365 | return ret; | |
2366 | } | |
2367 | ||
2368 | /* | |
2369 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2370 | */ | |
44d3bd01 | 2371 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2372 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2373 | { |
2374 | int ret; | |
f6a9efaa | 2375 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2376 | struct lttng_ht *chan_ht; |
f6a9efaa | 2377 | |
5d56b5aa | 2378 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2379 | |
aea829b3 | 2380 | switch (domain) { |
44d3bd01 DG |
2381 | case LTTNG_DOMAIN_KERNEL: |
2382 | { | |
2383 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2384 | |
44d3bd01 DG |
2385 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2386 | session->kernel_session); | |
2387 | if (kchan == NULL) { | |
2388 | ret = channel_kernel_create(session->kernel_session, | |
2389 | attr, kernel_poll_pipe[1]); | |
2390 | } else { | |
2391 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2392 | } | |
2393 | ||
2394 | if (ret != LTTCOMM_OK) { | |
2395 | goto error; | |
2396 | } | |
2397 | ||
2398 | kernel_wait_quiescent(kernel_tracer_fd); | |
2399 | break; | |
2400 | } | |
f6a9efaa DG |
2401 | case LTTNG_DOMAIN_UST: |
2402 | { | |
2403 | struct ltt_ust_channel *uchan; | |
2404 | ||
7885e399 | 2405 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2406 | |
7885e399 | 2407 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2408 | if (uchan == NULL) { |
7885e399 | 2409 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2410 | } else { |
7885e399 | 2411 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2412 | } |
f6a9efaa DG |
2413 | break; |
2414 | } | |
d78d6610 | 2415 | #if 0 |
78f0bacd DG |
2416 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2417 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2418 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2419 | #endif |
44d3bd01 DG |
2420 | default: |
2421 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2422 | goto error; | |
54d01ffb DG |
2423 | } |
2424 | ||
54d01ffb DG |
2425 | error: |
2426 | return ret; | |
2427 | } | |
2428 | ||
2429 | /* | |
2430 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2431 | */ | |
2432 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2433 | char *channel_name, char *event_name) | |
2434 | { | |
2435 | int ret; | |
54d01ffb DG |
2436 | |
2437 | switch (domain) { | |
2438 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2439 | { |
2440 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2441 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2442 | |
b0a40d28 DG |
2443 | ksess = session->kernel_session; |
2444 | ||
2445 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2446 | if (kchan == NULL) { |
2447 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2448 | goto error; | |
d65106b1 DG |
2449 | } |
2450 | ||
b0a40d28 | 2451 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2452 | if (ret != LTTCOMM_OK) { |
2453 | goto error; | |
2454 | } | |
2455 | ||
2456 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2457 | break; |
2bdd86d4 MD |
2458 | } |
2459 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2460 | { |
b0a40d28 | 2461 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2462 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2463 | |
2464 | usess = session->ust_session; | |
2465 | ||
2466 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2467 | channel_name); | |
2468 | if (uchan == NULL) { | |
2469 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2470 | goto error; | |
2471 | } | |
2472 | ||
7f79d3a1 DG |
2473 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2474 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2475 | goto error; |
2476 | } | |
2477 | ||
7f79d3a1 | 2478 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2479 | channel_name); |
b0a40d28 DG |
2480 | break; |
2481 | } | |
d78d6610 | 2482 | #if 0 |
2bdd86d4 MD |
2483 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2484 | case LTTNG_DOMAIN_UST_PID: | |
2485 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2486 | #endif |
54d01ffb | 2487 | default: |
1ab1ea0b | 2488 | ret = LTTCOMM_UND; |
54d01ffb | 2489 | goto error; |
d65106b1 | 2490 | } |
26cc6b4e | 2491 | |
54d01ffb DG |
2492 | ret = LTTCOMM_OK; |
2493 | ||
2494 | error: | |
2495 | return ret; | |
2496 | } | |
2497 | ||
2498 | /* | |
2499 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2500 | */ | |
2501 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2502 | char *channel_name) | |
2503 | { | |
2504 | int ret; | |
54d01ffb DG |
2505 | |
2506 | switch (domain) { | |
2507 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2508 | { |
2509 | struct ltt_kernel_session *ksess; | |
2510 | struct ltt_kernel_channel *kchan; | |
2511 | ||
2512 | ksess = session->kernel_session; | |
2513 | ||
2514 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2515 | if (kchan == NULL) { |
2516 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2517 | goto error; | |
26cc6b4e DG |
2518 | } |
2519 | ||
9730260e | 2520 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2521 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2522 | goto error; |
26cc6b4e DG |
2523 | } |
2524 | ||
54d01ffb | 2525 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2526 | break; |
9730260e DG |
2527 | } |
2528 | case LTTNG_DOMAIN_UST: | |
2529 | { | |
2530 | struct ltt_ust_session *usess; | |
2531 | struct ltt_ust_channel *uchan; | |
2532 | ||
2533 | usess = session->ust_session; | |
2534 | ||
2535 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2536 | channel_name); | |
2537 | if (uchan == NULL) { | |
2538 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2539 | goto error; | |
2540 | } | |
2541 | ||
7f79d3a1 DG |
2542 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2543 | if (ret != 0) { | |
9730260e DG |
2544 | goto error; |
2545 | } | |
2546 | ||
7f79d3a1 | 2547 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2548 | |
2549 | break; | |
2550 | } | |
d78d6610 | 2551 | #if 0 |
9730260e DG |
2552 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2553 | case LTTNG_DOMAIN_UST_PID: | |
2554 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2555 | #endif |
54d01ffb | 2556 | default: |
1ab1ea0b | 2557 | ret = LTTCOMM_UND; |
54d01ffb | 2558 | goto error; |
26cc6b4e | 2559 | } |
e953ef25 | 2560 | |
54d01ffb | 2561 | ret = LTTCOMM_OK; |
e953ef25 | 2562 | |
54d01ffb DG |
2563 | error: |
2564 | return ret; | |
2565 | } | |
f5177a38 | 2566 | |
54d01ffb DG |
2567 | /* |
2568 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2569 | */ | |
2570 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2571 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2572 | { | |
2573 | int ret; | |
f5177a38 | 2574 | |
54d01ffb DG |
2575 | switch (domain) { |
2576 | case LTTNG_DOMAIN_KERNEL: | |
2577 | /* Add kernel context to kernel tracer */ | |
2578 | ret = context_kernel_add(session->kernel_session, ctx, | |
2579 | event_name, channel_name); | |
2580 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2581 | goto error; |
e953ef25 | 2582 | } |
2bdd86d4 MD |
2583 | break; |
2584 | case LTTNG_DOMAIN_UST: | |
2585 | { | |
55cc08a6 | 2586 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2587 | |
55cc08a6 DG |
2588 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2589 | if (ret != LTTCOMM_OK) { | |
2590 | goto error; | |
2bdd86d4 | 2591 | } |
e953ef25 | 2592 | break; |
2bdd86d4 | 2593 | } |
d78d6610 | 2594 | #if 0 |
55cc08a6 DG |
2595 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2596 | case LTTNG_DOMAIN_UST_PID: | |
2597 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2598 | #endif |
54d01ffb | 2599 | default: |
1ab1ea0b | 2600 | ret = LTTCOMM_UND; |
54d01ffb | 2601 | goto error; |
e953ef25 | 2602 | } |
950131af | 2603 | |
54d01ffb | 2604 | ret = LTTCOMM_OK; |
950131af | 2605 | |
54d01ffb DG |
2606 | error: |
2607 | return ret; | |
2608 | } | |
2609 | ||
2610 | /* | |
2611 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2612 | */ | |
2613 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2614 | char *channel_name, struct lttng_event *event) | |
2615 | { | |
2616 | int ret; | |
f6cd6b0f | 2617 | struct lttng_channel *attr; |
48842b30 | 2618 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2619 | |
2620 | switch (domain) { | |
2621 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2622 | { |
2623 | struct ltt_kernel_channel *kchan; | |
2624 | ||
54d01ffb DG |
2625 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2626 | session->kernel_session); | |
2627 | if (kchan == NULL) { | |
f6cd6b0f DG |
2628 | attr = channel_new_default_attr(domain); |
2629 | if (attr == NULL) { | |
2630 | ret = LTTCOMM_FATAL; | |
2631 | goto error; | |
2632 | } | |
2633 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2634 | ||
54d01ffb | 2635 | /* This call will notify the kernel thread */ |
44d3bd01 | 2636 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2637 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2638 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2639 | free(attr); |
f5177a38 DG |
2640 | goto error; |
2641 | } | |
ff4d74e6 | 2642 | free(attr); |
54d01ffb | 2643 | } |
950131af | 2644 | |
54d01ffb DG |
2645 | /* Get the newly created kernel channel pointer */ |
2646 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2647 | session->kernel_session); | |
2648 | if (kchan == NULL) { | |
2649 | /* This sould not happen... */ | |
2650 | ret = LTTCOMM_FATAL; | |
2651 | goto error; | |
2652 | } | |
f5177a38 | 2653 | |
48842b30 DG |
2654 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2655 | event); | |
54d01ffb | 2656 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2657 | goto error; |
950131af DG |
2658 | } |
2659 | ||
54d01ffb | 2660 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2661 | break; |
2bdd86d4 MD |
2662 | } |
2663 | case LTTNG_DOMAIN_UST: | |
2664 | { | |
aea829b3 | 2665 | struct lttng_channel *attr; |
edb67388 | 2666 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2667 | |
edb67388 | 2668 | /* Get channel from global UST domain */ |
48842b30 DG |
2669 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2670 | channel_name); | |
2671 | if (uchan == NULL) { | |
aea829b3 DG |
2672 | /* Create default channel */ |
2673 | attr = channel_new_default_attr(domain); | |
2674 | if (attr == NULL) { | |
2675 | ret = LTTCOMM_FATAL; | |
2676 | goto error; | |
2677 | } | |
596219f7 | 2678 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2679 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2680 | |
7885e399 | 2681 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2682 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2683 | free(attr); |
aea829b3 DG |
2684 | goto error; |
2685 | } | |
aea829b3 DG |
2686 | free(attr); |
2687 | ||
2688 | /* Get the newly created channel reference back */ | |
2689 | uchan = trace_ust_find_channel_by_name( | |
2690 | usess->domain_global.channels, channel_name); | |
2691 | if (uchan == NULL) { | |
2692 | /* Something is really wrong */ | |
2693 | ret = LTTCOMM_FATAL; | |
2694 | goto error; | |
2695 | } | |
48842b30 | 2696 | } |
2bdd86d4 | 2697 | |
edb67388 | 2698 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2699 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2700 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2701 | goto error; |
2bdd86d4 MD |
2702 | } |
2703 | break; | |
2704 | } | |
d78d6610 | 2705 | #if 0 |
2bdd86d4 MD |
2706 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2707 | case LTTNG_DOMAIN_UST_PID: | |
2708 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2709 | #endif |
54d01ffb | 2710 | default: |
1ab1ea0b | 2711 | ret = LTTCOMM_UND; |
54d01ffb | 2712 | goto error; |
950131af | 2713 | } |
d36b8583 | 2714 | |
54d01ffb | 2715 | ret = LTTCOMM_OK; |
d36b8583 | 2716 | |
54d01ffb DG |
2717 | error: |
2718 | return ret; | |
2719 | } | |
7d29a247 | 2720 | |
54d01ffb DG |
2721 | /* |
2722 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2723 | */ | |
2724 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2725 | char *channel_name, int event_type) |
54d01ffb DG |
2726 | { |
2727 | int ret; | |
2728 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2729 | |
54d01ffb DG |
2730 | switch (domain) { |
2731 | case LTTNG_DOMAIN_KERNEL: | |
2732 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2733 | session->kernel_session); | |
2734 | if (kchan == NULL) { | |
2735 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2736 | ret = channel_kernel_create(session->kernel_session, NULL, |
2737 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2738 | if (ret != LTTCOMM_OK) { |
2739 | goto error; | |
d36b8583 | 2740 | } |
0d0c377a | 2741 | |
8f69e5eb DG |
2742 | /* Get the newly created kernel channel pointer */ |
2743 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2744 | session->kernel_session); | |
2745 | if (kchan == NULL) { | |
2746 | /* This sould not happen... */ | |
2747 | ret = LTTCOMM_FATAL; | |
2748 | goto error; | |
2749 | } | |
2750 | ||
54d01ffb | 2751 | } |
0fdd1e2c | 2752 | |
7a3d1328 | 2753 | switch (event_type) { |
76d45b40 | 2754 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2755 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2756 | kchan, kernel_tracer_fd); |
7a3d1328 | 2757 | break; |
76d45b40 | 2758 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2759 | /* |
7a3d1328 MD |
2760 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2761 | * events already registered to the channel. | |
8c9ae521 | 2762 | */ |
7a3d1328 MD |
2763 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2764 | kchan, kernel_tracer_fd); | |
2765 | break; | |
76d45b40 | 2766 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2767 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2768 | ret = event_kernel_enable_all(session->kernel_session, |
2769 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2770 | break; |
2771 | default: | |
2772 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2773 | goto error; | |
8c9ae521 | 2774 | } |
8f69e5eb DG |
2775 | |
2776 | /* Manage return value */ | |
54d01ffb | 2777 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2778 | goto error; |
d36b8583 DG |
2779 | } |
2780 | ||
54d01ffb | 2781 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2782 | break; |
76d45b40 DG |
2783 | case LTTNG_DOMAIN_UST: |
2784 | { | |
2785 | struct lttng_channel *attr; | |
2786 | struct ltt_ust_channel *uchan; | |
2787 | struct ltt_ust_session *usess = session->ust_session; | |
2788 | ||
2789 | /* Get channel from global UST domain */ | |
2790 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2791 | channel_name); | |
2792 | if (uchan == NULL) { | |
2793 | /* Create default channel */ | |
2794 | attr = channel_new_default_attr(domain); | |
2795 | if (attr == NULL) { | |
2796 | ret = LTTCOMM_FATAL; | |
2797 | goto error; | |
2798 | } | |
2799 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2800 | attr->name[NAME_MAX - 1] = '\0'; | |
2801 | ||
2802 | /* Use the internal command enable channel */ | |
7885e399 | 2803 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2804 | if (ret != LTTCOMM_OK) { |
2805 | free(attr); | |
2806 | goto error; | |
2807 | } | |
2808 | free(attr); | |
2809 | ||
2810 | /* Get the newly created channel reference back */ | |
2811 | uchan = trace_ust_find_channel_by_name( | |
2812 | usess->domain_global.channels, channel_name); | |
2813 | if (uchan == NULL) { | |
2814 | /* Something is really wrong */ | |
2815 | ret = LTTCOMM_FATAL; | |
2816 | goto error; | |
2817 | } | |
2818 | } | |
2819 | ||
2820 | /* At this point, the session and channel exist on the tracer */ | |
2821 | ||
2822 | switch (event_type) { | |
2823 | case LTTNG_EVENT_ALL: | |
2824 | case LTTNG_EVENT_TRACEPOINT: | |
2825 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2826 | if (ret != LTTCOMM_OK) { | |
2827 | goto error; | |
2828 | } | |
2829 | break; | |
2830 | default: | |
2831 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2832 | goto error; | |
2833 | } | |
2834 | ||
2835 | /* Manage return value */ | |
2836 | if (ret != LTTCOMM_OK) { | |
2837 | goto error; | |
2838 | } | |
2839 | ||
2840 | break; | |
2841 | } | |
d78d6610 | 2842 | #if 0 |
76d45b40 DG |
2843 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2844 | case LTTNG_DOMAIN_UST_PID: | |
2845 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2846 | #endif |
54d01ffb | 2847 | default: |
1ab1ea0b | 2848 | ret = LTTCOMM_UND; |
54d01ffb | 2849 | goto error; |
d36b8583 | 2850 | } |
f3ed775e | 2851 | |
54d01ffb DG |
2852 | ret = LTTCOMM_OK; |
2853 | ||
2854 | error: | |
2855 | return ret; | |
2856 | } | |
2857 | ||
2858 | /* | |
2859 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2860 | */ | |
2861 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2862 | { | |
2863 | int ret; | |
2864 | ssize_t nb_events = 0; | |
2865 | ||
2866 | switch (domain) { | |
2867 | case LTTNG_DOMAIN_KERNEL: | |
2868 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2869 | if (nb_events < 0) { | |
2870 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2871 | goto error; | |
894be886 | 2872 | } |
54d01ffb | 2873 | break; |
b551a063 DG |
2874 | case LTTNG_DOMAIN_UST: |
2875 | nb_events = ust_app_list_events(events); | |
2876 | if (nb_events < 0) { | |
2877 | ret = LTTCOMM_UST_LIST_FAIL; | |
2878 | goto error; | |
2879 | } | |
2880 | break; | |
54d01ffb | 2881 | default: |
1ab1ea0b | 2882 | ret = LTTCOMM_UND; |
54d01ffb DG |
2883 | goto error; |
2884 | } | |
894be886 | 2885 | |
54d01ffb | 2886 | return nb_events; |
7d29a247 | 2887 | |
54d01ffb DG |
2888 | error: |
2889 | /* Return negative value to differentiate return code */ | |
2890 | return -ret; | |
2891 | } | |
b389abbe | 2892 | |
54d01ffb DG |
2893 | /* |
2894 | * Command LTTNG_START_TRACE processed by the client thread. | |
2895 | */ | |
2896 | static int cmd_start_trace(struct ltt_session *session) | |
2897 | { | |
2898 | int ret; | |
54d01ffb | 2899 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2900 | struct ltt_ust_session *usess; |
b389abbe | 2901 | |
54d01ffb DG |
2902 | /* Short cut */ |
2903 | ksession = session->kernel_session; | |
b9d9b220 | 2904 | usess = session->ust_session; |
5eb91c98 | 2905 | |
b9ef1c83 | 2906 | if (session->enabled) { |
80e327fa DG |
2907 | /* Already started. */ |
2908 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2909 | goto error; |
2910 | } | |
2911 | ||
464dd62d MD |
2912 | session->enabled = 1; |
2913 | ||
54d01ffb DG |
2914 | /* Kernel tracing */ |
2915 | if (ksession != NULL) { | |
2bdd86d4 MD |
2916 | struct ltt_kernel_channel *kchan; |
2917 | ||
54d01ffb DG |
2918 | /* Open kernel metadata */ |
2919 | if (ksession->metadata == NULL) { | |
2920 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2921 | if (ret < 0) { | |
2922 | ret = LTTCOMM_KERN_META_FAIL; | |
2923 | goto error; | |
b389abbe | 2924 | } |
54d01ffb | 2925 | } |
7d29a247 | 2926 | |
54d01ffb | 2927 | /* Open kernel metadata stream */ |
03550b58 | 2928 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2929 | ret = kernel_open_metadata_stream(ksession); |
2930 | if (ret < 0) { | |
2931 | ERR("Kernel create metadata stream failed"); | |
2932 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2933 | goto error; | |
2934 | } | |
2935 | } | |
2936 | ||
2937 | /* For each channel */ | |
2938 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2939 | if (kchan->stream_count == 0) { | |
2940 | ret = kernel_open_channel_stream(kchan); | |
2941 | if (ret < 0) { | |
2942 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2943 | goto error; |
2944 | } | |
54d01ffb DG |
2945 | /* Update the stream global counter */ |
2946 | ksession->stream_count_global += ret; | |
7d29a247 | 2947 | } |
54d01ffb DG |
2948 | } |
2949 | ||
2950 | /* Setup kernel consumer socket and send fds to it */ | |
2951 | ret = init_kernel_tracing(ksession); | |
2952 | if (ret < 0) { | |
2953 | ret = LTTCOMM_KERN_START_FAIL; | |
2954 | goto error; | |
2955 | } | |
2956 | ||
2957 | /* This start the kernel tracing */ | |
2958 | ret = kernel_start_session(ksession); | |
2959 | if (ret < 0) { | |
2960 | ret = LTTCOMM_KERN_START_FAIL; | |
2961 | goto error; | |
2962 | } | |
2963 | ||
2964 | /* Quiescent wait after starting trace */ | |
2965 | kernel_wait_quiescent(kernel_tracer_fd); | |
2966 | } | |
2967 | ||
36dc12cc | 2968 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2969 | if (usess) { |
2970 | usess->start_trace = 1; | |
36dc12cc | 2971 | |
b9d9b220 DG |
2972 | ret = ust_app_start_trace_all(usess); |
2973 | if (ret < 0) { | |
2974 | ret = LTTCOMM_UST_START_FAIL; | |
2975 | goto error; | |
2976 | } | |
2bdd86d4 | 2977 | } |
54d01ffb DG |
2978 | |
2979 | ret = LTTCOMM_OK; | |
2980 | ||
2981 | error: | |
2982 | return ret; | |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2987 | */ | |
2988 | static int cmd_stop_trace(struct ltt_session *session) | |
2989 | { | |
2990 | int ret; | |
2991 | struct ltt_kernel_channel *kchan; | |
2992 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2993 | struct ltt_ust_session *usess; |
54d01ffb DG |
2994 | |
2995 | /* Short cut */ | |
2996 | ksession = session->kernel_session; | |
8be98f9a | 2997 | usess = session->ust_session; |
54d01ffb | 2998 | |
b9ef1c83 | 2999 | if (!session->enabled) { |
80e327fa | 3000 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
3001 | goto error; |
3002 | } | |
3003 | ||
464dd62d MD |
3004 | session->enabled = 0; |
3005 | ||
54d01ffb DG |
3006 | /* Kernel tracer */ |
3007 | if (ksession != NULL) { | |
3008 | DBG("Stop kernel tracing"); | |
3009 | ||
3010 | /* Flush all buffers before stopping */ | |
3011 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
3012 | if (ret < 0) { | |
3013 | ERR("Kernel metadata flush failed"); | |
3014 | } | |
f34daff7 | 3015 | |
54d01ffb DG |
3016 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3017 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3018 | if (ret < 0) { |
54d01ffb | 3019 | ERR("Kernel flush buffer error"); |
7d29a247 | 3020 | } |
54d01ffb | 3021 | } |
19e70852 | 3022 | |
54d01ffb DG |
3023 | ret = kernel_stop_session(ksession); |
3024 | if (ret < 0) { | |
3025 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3026 | goto error; |
f3ed775e | 3027 | } |
54d01ffb DG |
3028 | |
3029 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3030 | } |
54d01ffb | 3031 | |
8be98f9a MD |
3032 | if (usess) { |
3033 | usess->start_trace = 0; | |
2bdd86d4 | 3034 | |
8be98f9a | 3035 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3036 | if (ret < 0) { |
190df5ac | 3037 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3038 | goto error; |
3039 | } | |
2bdd86d4 | 3040 | } |
54d01ffb DG |
3041 | |
3042 | ret = LTTCOMM_OK; | |
3043 | ||
3044 | error: | |
3045 | return ret; | |
3046 | } | |
3047 | ||
3048 | /* | |
3049 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3050 | */ | |
730389d9 | 3051 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
3052 | { |
3053 | int ret; | |
3054 | ||
730389d9 DG |
3055 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3056 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
3057 | if (ret != LTTCOMM_OK) { |
3058 | goto error; | |
3059 | } | |
3060 | ||
3061 | ret = LTTCOMM_OK; | |
3062 | ||
3063 | error: | |
3064 | return ret; | |
3065 | } | |
3066 | ||
3067 | /* | |
3068 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3069 | */ | |
3070 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3071 | { | |
3072 | int ret; | |
3073 | ||
3074 | /* Clean kernel session teardown */ | |
3075 | teardown_kernel_session(session); | |
84cd17c6 MD |
3076 | /* UST session teardown */ |
3077 | teardown_ust_session(session); | |
54d01ffb DG |
3078 | |
3079 | /* | |
3080 | * Must notify the kernel thread here to update it's poll setin order | |
3081 | * to remove the channel(s)' fd just destroyed. | |
3082 | */ | |
3083 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3084 | if (ret < 0) { | |
76d7553f | 3085 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3086 | } |
3087 | ||
271933a4 | 3088 | ret = session_destroy(session); |
54d01ffb DG |
3089 | |
3090 | return ret; | |
3091 | } | |
3092 | ||
3093 | /* | |
3094 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3095 | */ | |
3096 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3097 | { | |
3098 | int ret; | |
3099 | ||
3100 | switch (domain) { | |
3101 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3102 | { |
54d01ffb | 3103 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3104 | |
54d01ffb DG |
3105 | kcalibrate.type = calibrate->type; |
3106 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3107 | if (ret < 0) { |
54d01ffb DG |
3108 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3109 | goto error; | |
33a2b854 | 3110 | } |
54d01ffb DG |
3111 | break; |
3112 | } | |
4466912f DG |
3113 | case LTTNG_DOMAIN_UST: |
3114 | { | |
3115 | struct lttng_ust_calibrate ucalibrate; | |
3116 | ||
3117 | ucalibrate.type = calibrate->type; | |
3118 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3119 | if (ret < 0) { | |
3120 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3121 | goto error; | |
3122 | } | |
3123 | break; | |
3124 | } | |
54d01ffb | 3125 | default: |
1ab1ea0b | 3126 | ret = LTTCOMM_UND; |
54d01ffb DG |
3127 | goto error; |
3128 | } | |
33a2b854 | 3129 | |
54d01ffb | 3130 | ret = LTTCOMM_OK; |
33a2b854 | 3131 | |
54d01ffb DG |
3132 | error: |
3133 | return ret; | |
3134 | } | |
7d29a247 | 3135 | |
54d01ffb DG |
3136 | /* |
3137 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3138 | */ | |
3139 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3140 | char *sock_path) | |
3141 | { | |
3142 | int ret, sock; | |
b389abbe | 3143 | |
54d01ffb DG |
3144 | switch (domain) { |
3145 | case LTTNG_DOMAIN_KERNEL: | |
3146 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3147 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3148 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3149 | goto error; | |
3150 | } | |
3151 | ||
3152 | sock = lttcomm_connect_unix_sock(sock_path); | |
3153 | if (sock < 0) { | |
3154 | ret = LTTCOMM_CONNECT_FAIL; | |
3155 | goto error; | |
3156 | } | |
3157 | ||
3158 | session->kernel_session->consumer_fd = sock; | |
3159 | break; | |
3160 | default: | |
3161 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3162 | ret = LTTCOMM_UND; |
54d01ffb DG |
3163 | goto error; |
3164 | } | |
3165 | ||
3166 | ret = LTTCOMM_OK; | |
3167 | ||
3168 | error: | |
3169 | return ret; | |
3170 | } | |
3171 | ||
3172 | /* | |
3173 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3174 | */ | |
3175 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3176 | struct lttng_domain **domains) | |
3177 | { | |
b551a063 | 3178 | int ret, index = 0; |
54d01ffb DG |
3179 | ssize_t nb_dom = 0; |
3180 | ||
3181 | if (session->kernel_session != NULL) { | |
b551a063 | 3182 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3183 | nb_dom++; |
3184 | } | |
3185 | ||
b551a063 DG |
3186 | if (session->ust_session != NULL) { |
3187 | DBG3("Listing domains found UST global domain"); | |
3188 | nb_dom++; | |
3189 | } | |
54d01ffb | 3190 | |
b551a063 | 3191 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3192 | if (*domains == NULL) { |
3193 | ret = -LTTCOMM_FATAL; | |
3194 | goto error; | |
3195 | } | |
3196 | ||
b551a063 DG |
3197 | if (session->kernel_session != NULL) { |
3198 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3199 | index++; | |
3200 | } | |
3201 | ||
3202 | if (session->ust_session != NULL) { | |
3203 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3204 | index++; | |
3205 | } | |
54d01ffb | 3206 | |
54d01ffb DG |
3207 | return nb_dom; |
3208 | ||
3209 | error: | |
3210 | return ret; | |
3211 | } | |
3212 | ||
3213 | /* | |
3214 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3215 | */ | |
b551a063 | 3216 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3217 | struct lttng_channel **channels) |
3218 | { | |
3219 | int ret; | |
3220 | ssize_t nb_chan = 0; | |
3221 | ||
b551a063 DG |
3222 | switch (domain) { |
3223 | case LTTNG_DOMAIN_KERNEL: | |
3224 | if (session->kernel_session != NULL) { | |
3225 | nb_chan = session->kernel_session->channel_count; | |
3226 | } | |
0df502fd | 3227 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3228 | break; |
3229 | case LTTNG_DOMAIN_UST: | |
3230 | if (session->ust_session != NULL) { | |
bec39940 | 3231 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3232 | session->ust_session->domain_global.channels); |
3233 | } | |
0df502fd | 3234 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3235 | break; |
3236 | default: | |
3237 | *channels = NULL; | |
1ab1ea0b | 3238 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3239 | goto error; |
3240 | } | |
3241 | ||
b551a063 DG |
3242 | if (nb_chan > 0) { |
3243 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3244 | if (*channels == NULL) { | |
3245 | ret = -LTTCOMM_FATAL; | |
3246 | goto error; | |
3247 | } | |
54d01ffb | 3248 | |
b551a063 DG |
3249 | list_lttng_channels(domain, session, *channels); |
3250 | } else { | |
3251 | *channels = NULL; | |
3252 | } | |
2bdd86d4 | 3253 | |
54d01ffb DG |
3254 | return nb_chan; |
3255 | ||
3256 | error: | |
3257 | return ret; | |
3258 | } | |
3259 | ||
3260 | /* | |
3261 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3262 | */ | |
b551a063 | 3263 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3264 | char *channel_name, struct lttng_event **events) |
3265 | { | |
b551a063 | 3266 | int ret = 0; |
54d01ffb | 3267 | ssize_t nb_event = 0; |
54d01ffb | 3268 | |
b551a063 DG |
3269 | switch (domain) { |
3270 | case LTTNG_DOMAIN_KERNEL: | |
3271 | if (session->kernel_session != NULL) { | |
3272 | nb_event = list_lttng_kernel_events(channel_name, | |
3273 | session->kernel_session, events); | |
54d01ffb | 3274 | } |
b551a063 DG |
3275 | break; |
3276 | case LTTNG_DOMAIN_UST: | |
3277 | { | |
3278 | if (session->ust_session != NULL) { | |
3279 | nb_event = list_lttng_ust_global_events(channel_name, | |
3280 | &session->ust_session->domain_global, events); | |
3281 | } | |
3282 | break; | |
54d01ffb | 3283 | } |
b551a063 | 3284 | default: |
1ab1ea0b | 3285 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3286 | goto error; |
3287 | } | |
3288 | ||
b551a063 | 3289 | ret = nb_event; |
54d01ffb DG |
3290 | |
3291 | error: | |
3292 | return ret; | |
3293 | } | |
3294 | ||
3295 | /* | |
3296 | * Process the command requested by the lttng client within the command | |
3297 | * context structure. This function make sure that the return structure (llm) | |
3298 | * is set and ready for transmission before returning. | |
3299 | * | |
3300 | * Return any error encountered or 0 for success. | |
3301 | */ | |
3302 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3303 | { | |
3304 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3305 | int need_tracing_session = 1; |
2e09ba09 | 3306 | int need_domain; |
54d01ffb DG |
3307 | |
3308 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3309 | ||
2e09ba09 MD |
3310 | switch (cmd_ctx->lsm->cmd_type) { |
3311 | case LTTNG_CREATE_SESSION: | |
3312 | case LTTNG_DESTROY_SESSION: | |
3313 | case LTTNG_LIST_SESSIONS: | |
3314 | case LTTNG_LIST_DOMAINS: | |
3315 | case LTTNG_START_TRACE: | |
3316 | case LTTNG_STOP_TRACE: | |
3317 | need_domain = 0; | |
3aace903 | 3318 | break; |
2e09ba09 MD |
3319 | default: |
3320 | need_domain = 1; | |
3321 | } | |
3322 | ||
3323 | if (opt_no_kernel && need_domain | |
3324 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3325 | if (!is_root) { |
3326 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3327 | } else { | |
3328 | ret = LTTCOMM_KERN_NA; | |
3329 | } | |
4fba7219 DG |
3330 | goto error; |
3331 | } | |
3332 | ||
54d01ffb DG |
3333 | /* |
3334 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3335 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3336 | * command. |
3337 | */ | |
3338 | switch(cmd_ctx->lsm->cmd_type) { | |
3339 | case LTTNG_LIST_SESSIONS: | |
3340 | case LTTNG_LIST_TRACEPOINTS: | |
3341 | case LTTNG_LIST_DOMAINS: | |
3342 | case LTTNG_LIST_CHANNELS: | |
3343 | case LTTNG_LIST_EVENTS: | |
3344 | break; | |
3345 | default: | |
3346 | /* Setup lttng message with no payload */ | |
3347 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3348 | if (ret < 0) { | |
3349 | /* This label does not try to unlock the session */ | |
3350 | goto init_setup_error; | |
3351 | } | |
3352 | } | |
3353 | ||
3354 | /* Commands that DO NOT need a session. */ | |
3355 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3356 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3357 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3358 | case LTTNG_LIST_SESSIONS: |
3359 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3360 | need_tracing_session = 0; |
54d01ffb DG |
3361 | break; |
3362 | default: | |
3363 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3364 | /* |
3365 | * We keep the session list lock across _all_ commands | |
3366 | * for now, because the per-session lock does not | |
3367 | * handle teardown properly. | |
3368 | */ | |
74babd95 | 3369 | session_lock_list(); |
54d01ffb DG |
3370 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3371 | if (cmd_ctx->session == NULL) { | |
3372 | if (cmd_ctx->lsm->session.name != NULL) { | |
3373 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3374 | } else { | |
3375 | /* If no session name specified */ | |
3376 | ret = LTTCOMM_SELECT_SESS; | |
3377 | } | |
3378 | goto error; | |
3379 | } else { | |
3380 | /* Acquire lock for the session */ | |
3381 | session_lock(cmd_ctx->session); | |
3382 | } | |
3383 | break; | |
3384 | } | |
b389abbe | 3385 | |
2e09ba09 MD |
3386 | if (!need_domain) { |
3387 | goto skip_domain; | |
3388 | } | |
54d01ffb DG |
3389 | /* |
3390 | * Check domain type for specific "pre-action". | |
3391 | */ | |
3392 | switch (cmd_ctx->lsm->domain.type) { | |
3393 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3394 | if (!is_root) { |
531d29f9 | 3395 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3396 | goto error; |
3397 | } | |
3398 | ||
54d01ffb | 3399 | /* Kernel tracer check */ |
a4b35e07 | 3400 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3401 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3402 | ret = init_kernel_tracer(); |
3403 | if (ret != 0) { | |
54d01ffb DG |
3404 | goto error; |
3405 | } | |
3406 | } | |
5eb91c98 | 3407 | |
5c827ce0 DG |
3408 | /* Consumer is in an ERROR state. Report back to client */ |
3409 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
3410 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3411 | goto error; | |
3412 | } | |
3413 | ||
54d01ffb | 3414 | /* Need a session for kernel command */ |
44d3bd01 | 3415 | if (need_tracing_session) { |
54d01ffb | 3416 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3417 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3418 | if (ret < 0) { |
54d01ffb | 3419 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3420 | goto error; |
3421 | } | |
b389abbe | 3422 | } |
7d29a247 | 3423 | |
54d01ffb | 3424 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3425 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3426 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3427 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3428 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3429 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3430 | if (ret < 0) { |
54d01ffb DG |
3431 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3432 | goto error; | |
950131af | 3433 | } |
5c827ce0 | 3434 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3435 | } else { |
3436 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3437 | } |
0d0c377a | 3438 | } |
5c827ce0 | 3439 | |
54d01ffb | 3440 | break; |
2bdd86d4 | 3441 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3442 | { |
5c827ce0 DG |
3443 | /* Consumer is in an ERROR state. Report back to client */ |
3444 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
3445 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3446 | goto error; | |
3447 | } | |
3448 | ||
44d3bd01 | 3449 | if (need_tracing_session) { |
f6a9efaa | 3450 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3451 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3452 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3453 | if (ret != LTTCOMM_OK) { |
3454 | goto error; | |
3455 | } | |
3456 | } | |
7753dea8 MD |
3457 | /* Start the UST consumer daemons */ |
3458 | /* 64-bit */ | |
3459 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3460 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3461 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3462 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3463 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3464 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3465 | if (ret < 0) { |
7753dea8 MD |
3466 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3467 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3468 | goto error; |
3469 | } | |
48842b30 | 3470 | |
7753dea8 | 3471 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
5c827ce0 | 3472 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3473 | } else { |
7753dea8 MD |
3474 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3475 | } | |
3476 | /* 32-bit */ | |
fc7a59ce | 3477 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3478 | ustconsumer32_data.pid == 0 && |
3479 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3480 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3481 | ret = start_consumerd(&ustconsumer32_data); | |
3482 | if (ret < 0) { | |
3483 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3484 | ust_consumerd32_fd = -EINVAL; | |
3485 | goto error; | |
3486 | } | |
5c827ce0 | 3487 | |
7753dea8 | 3488 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
5c827ce0 | 3489 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3490 | } else { |
3491 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3492 | } |
44d3bd01 DG |
3493 | } |
3494 | break; | |
48842b30 | 3495 | } |
54d01ffb | 3496 | default: |
54d01ffb DG |
3497 | break; |
3498 | } | |
2e09ba09 | 3499 | skip_domain: |
33a2b854 | 3500 | |
5c827ce0 DG |
3501 | /* Validate consumer daemon state when start/stop trace command */ |
3502 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3503 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3504 | switch (cmd_ctx->lsm->domain.type) { | |
3505 | case LTTNG_DOMAIN_UST: | |
3506 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
3507 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3508 | goto error; | |
3509 | } | |
3510 | break; | |
3511 | case LTTNG_DOMAIN_KERNEL: | |
3512 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
3513 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3514 | goto error; | |
3515 | } | |
3516 | break; | |
3517 | } | |
3518 | } | |
3519 | ||
8e0af1b4 MD |
3520 | /* |
3521 | * Check that the UID or GID match that of the tracing session. | |
3522 | * The root user can interact with all sessions. | |
3523 | */ | |
3524 | if (need_tracing_session) { | |
3525 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3526 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3527 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3528 | ret = LTTCOMM_EPERM; |
3529 | goto error; | |
3530 | } | |
3531 | } | |
3532 | ||
54d01ffb DG |
3533 | /* Process by command type */ |
3534 | switch (cmd_ctx->lsm->cmd_type) { | |
3535 | case LTTNG_ADD_CONTEXT: | |
3536 | { | |
3537 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3538 | cmd_ctx->lsm->u.context.channel_name, | |
3539 | cmd_ctx->lsm->u.context.event_name, | |
3540 | &cmd_ctx->lsm->u.context.ctx); | |
3541 | break; | |
3542 | } | |
3543 | case LTTNG_DISABLE_CHANNEL: | |
3544 | { | |
3545 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3546 | cmd_ctx->lsm->u.disable.channel_name); | |
3547 | break; | |
3548 | } | |
3549 | case LTTNG_DISABLE_EVENT: | |
3550 | { | |
3551 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3552 | cmd_ctx->lsm->u.disable.channel_name, | |
3553 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3554 | break; |
3555 | } | |
54d01ffb DG |
3556 | case LTTNG_DISABLE_ALL_EVENT: |
3557 | { | |
2bdd86d4 | 3558 | DBG("Disabling all events"); |
54d01ffb DG |
3559 | |
3560 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3561 | cmd_ctx->lsm->u.disable.channel_name); | |
3562 | break; | |
3563 | } | |
3564 | case LTTNG_ENABLE_CHANNEL: | |
3565 | { | |
aea829b3 | 3566 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3567 | &cmd_ctx->lsm->u.channel.chan); |
3568 | break; | |
3569 | } | |
3570 | case LTTNG_ENABLE_EVENT: | |
3571 | { | |
3572 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3573 | cmd_ctx->lsm->u.enable.channel_name, | |
3574 | &cmd_ctx->lsm->u.enable.event); | |
3575 | break; | |
3576 | } | |
3577 | case LTTNG_ENABLE_ALL_EVENT: | |
3578 | { | |
2bdd86d4 | 3579 | DBG("Enabling all events"); |
54d01ffb DG |
3580 | |
3581 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3582 | cmd_ctx->lsm->u.enable.channel_name, |
3583 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3584 | break; |
3585 | } | |
052da939 | 3586 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3587 | { |
9f19cc17 | 3588 | struct lttng_event *events; |
54d01ffb | 3589 | ssize_t nb_events; |
052da939 | 3590 | |
54d01ffb DG |
3591 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3592 | if (nb_events < 0) { | |
3593 | ret = -nb_events; | |
3594 | goto error; | |
2ef84c95 DG |
3595 | } |
3596 | ||
3597 | /* | |
3598 | * Setup lttng message with payload size set to the event list size in | |
3599 | * bytes and then copy list into the llm payload. | |
3600 | */ | |
052da939 | 3601 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3602 | if (ret < 0) { |
052da939 | 3603 | free(events); |
2ef84c95 DG |
3604 | goto setup_error; |
3605 | } | |
3606 | ||
3607 | /* Copy event list into message payload */ | |
9f19cc17 | 3608 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3609 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3610 | |
9f19cc17 | 3611 | free(events); |
2ef84c95 DG |
3612 | |
3613 | ret = LTTCOMM_OK; | |
3614 | break; | |
3615 | } | |
f3ed775e | 3616 | case LTTNG_START_TRACE: |
8c0faa1d | 3617 | { |
54d01ffb | 3618 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3619 | break; |
3620 | } | |
f3ed775e | 3621 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3622 | { |
54d01ffb | 3623 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3624 | break; |
3625 | } | |
5e16da05 MD |
3626 | case LTTNG_CREATE_SESSION: |
3627 | { | |
54d01ffb | 3628 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3629 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3630 | break; |
3631 | } | |
3632 | case LTTNG_DESTROY_SESSION: | |
3633 | { | |
54d01ffb DG |
3634 | ret = cmd_destroy_session(cmd_ctx->session, |
3635 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
3636 | /* |
3637 | * Set session to NULL so we do not unlock it after | |
3638 | * free. | |
3639 | */ | |
3640 | cmd_ctx->session = NULL; | |
5461b305 | 3641 | break; |
5e16da05 | 3642 | } |
9f19cc17 | 3643 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3644 | { |
54d01ffb DG |
3645 | ssize_t nb_dom; |
3646 | struct lttng_domain *domains; | |
5461b305 | 3647 | |
54d01ffb DG |
3648 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3649 | if (nb_dom < 0) { | |
3650 | ret = -nb_dom; | |
3651 | goto error; | |
ce3d728c | 3652 | } |
520ff687 | 3653 | |
54d01ffb | 3654 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3655 | if (ret < 0) { |
3656 | goto setup_error; | |
520ff687 | 3657 | } |
57167058 | 3658 | |
54d01ffb DG |
3659 | /* Copy event list into message payload */ |
3660 | memcpy(cmd_ctx->llm->payload, domains, | |
3661 | nb_dom * sizeof(struct lttng_domain)); | |
3662 | ||
3663 | free(domains); | |
5e16da05 | 3664 | |
5461b305 | 3665 | ret = LTTCOMM_OK; |
5e16da05 MD |
3666 | break; |
3667 | } | |
9f19cc17 | 3668 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3669 | { |
54d01ffb DG |
3670 | size_t nb_chan; |
3671 | struct lttng_channel *channels; | |
3672 | ||
b551a063 DG |
3673 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3674 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3675 | if (nb_chan < 0) { |
3676 | ret = -nb_chan; | |
3677 | goto error; | |
5461b305 | 3678 | } |
ca95a216 | 3679 | |
54d01ffb | 3680 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3681 | if (ret < 0) { |
3682 | goto setup_error; | |
3683 | } | |
9f19cc17 | 3684 | |
54d01ffb DG |
3685 | /* Copy event list into message payload */ |
3686 | memcpy(cmd_ctx->llm->payload, channels, | |
3687 | nb_chan * sizeof(struct lttng_channel)); | |
3688 | ||
3689 | free(channels); | |
9f19cc17 DG |
3690 | |
3691 | ret = LTTCOMM_OK; | |
5461b305 | 3692 | break; |
5e16da05 | 3693 | } |
9f19cc17 | 3694 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3695 | { |
b551a063 | 3696 | ssize_t nb_event; |
684d34d2 | 3697 | struct lttng_event *events = NULL; |
9f19cc17 | 3698 | |
b551a063 | 3699 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3700 | cmd_ctx->lsm->u.list.channel_name, &events); |
3701 | if (nb_event < 0) { | |
3702 | ret = -nb_event; | |
3703 | goto error; | |
5461b305 | 3704 | } |
ca95a216 | 3705 | |
54d01ffb | 3706 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3707 | if (ret < 0) { |
3708 | goto setup_error; | |
3709 | } | |
9f19cc17 | 3710 | |
54d01ffb DG |
3711 | /* Copy event list into message payload */ |
3712 | memcpy(cmd_ctx->llm->payload, events, | |
3713 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3714 | |
54d01ffb | 3715 | free(events); |
9f19cc17 DG |
3716 | |
3717 | ret = LTTCOMM_OK; | |
5461b305 | 3718 | break; |
5e16da05 MD |
3719 | } |
3720 | case LTTNG_LIST_SESSIONS: | |
3721 | { | |
8e0af1b4 | 3722 | unsigned int nr_sessions; |
5461b305 | 3723 | |
8e0af1b4 | 3724 | session_lock_list(); |
730389d9 DG |
3725 | nr_sessions = lttng_sessions_count( |
3726 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3727 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3728 | |
8e0af1b4 | 3729 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3730 | if (ret < 0) { |
54d01ffb | 3731 | session_unlock_list(); |
5461b305 | 3732 | goto setup_error; |
e065084a | 3733 | } |
5e16da05 | 3734 | |
6c9cc2ab | 3735 | /* Filled the session array */ |
8e0af1b4 | 3736 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3737 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3738 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3739 | |
54d01ffb | 3740 | session_unlock_list(); |
5e16da05 | 3741 | |
5461b305 | 3742 | ret = LTTCOMM_OK; |
5e16da05 MD |
3743 | break; |
3744 | } | |
d0254c7c MD |
3745 | case LTTNG_CALIBRATE: |
3746 | { | |
54d01ffb DG |
3747 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3748 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3749 | break; |
3750 | } | |
d9800920 DG |
3751 | case LTTNG_REGISTER_CONSUMER: |
3752 | { | |
54d01ffb DG |
3753 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3754 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3755 | break; |
3756 | } | |
5e16da05 | 3757 | default: |
5e16da05 | 3758 | ret = LTTCOMM_UND; |
5461b305 | 3759 | break; |
fac6795d DG |
3760 | } |
3761 | ||
5461b305 | 3762 | error: |
5461b305 DG |
3763 | if (cmd_ctx->llm == NULL) { |
3764 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3765 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3766 | goto setup_error; |
3767 | } | |
3768 | } | |
54d01ffb | 3769 | /* Set return code */ |
5461b305 | 3770 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3771 | setup_error: |
b5541356 | 3772 | if (cmd_ctx->session) { |
54d01ffb | 3773 | session_unlock(cmd_ctx->session); |
b5541356 | 3774 | } |
256a5576 MD |
3775 | if (need_tracing_session) { |
3776 | session_unlock_list(); | |
3777 | } | |
54d01ffb | 3778 | init_setup_error: |
8028d920 | 3779 | return ret; |
fac6795d DG |
3780 | } |
3781 | ||
1d4b027a | 3782 | /* |
d063d709 DG |
3783 | * This thread manage all clients request using the unix client socket for |
3784 | * communication. | |
1d4b027a DG |
3785 | */ |
3786 | static void *thread_manage_clients(void *data) | |
3787 | { | |
a4b35e07 | 3788 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3789 | uint32_t revents, nb_fd; |
273ea72c | 3790 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3791 | struct lttng_poll_event events; |
1d4b027a DG |
3792 | |
3793 | DBG("[thread] Manage client started"); | |
3794 | ||
f6a9efaa DG |
3795 | rcu_register_thread(); |
3796 | ||
1d4b027a DG |
3797 | ret = lttcomm_listen_unix_sock(client_sock); |
3798 | if (ret < 0) { | |
3799 | goto error; | |
3800 | } | |
3801 | ||
5eb91c98 DG |
3802 | /* |
3803 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3804 | * more will be added to this poll set. | |
3805 | */ | |
3806 | ret = create_thread_poll_set(&events, 2); | |
3807 | if (ret < 0) { | |
3808 | goto error; | |
3809 | } | |
273ea72c | 3810 | |
5eb91c98 DG |
3811 | /* Add the application registration socket */ |
3812 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3813 | if (ret < 0) { | |
3814 | goto error; | |
3815 | } | |
273ea72c | 3816 | |
bbd973c2 DG |
3817 | /* |
3818 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3819 | */ |
3820 | if (opt_sig_parent) { | |
8db8d1dc | 3821 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3822 | } |
3823 | ||
3824 | while (1) { | |
1d4b027a | 3825 | DBG("Accepting client command ..."); |
273ea72c | 3826 | |
5eb91c98 DG |
3827 | nb_fd = LTTNG_POLL_GETNB(&events); |
3828 | ||
273ea72c | 3829 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3830 | restart: |
5eb91c98 | 3831 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3832 | if (ret < 0) { |
88f2b785 MD |
3833 | /* |
3834 | * Restart interrupted system call. | |
3835 | */ | |
3836 | if (errno == EINTR) { | |
3837 | goto restart; | |
3838 | } | |
273ea72c DG |
3839 | goto error; |
3840 | } | |
3841 | ||
5eb91c98 DG |
3842 | for (i = 0; i < nb_fd; i++) { |
3843 | /* Fetch once the poll data */ | |
3844 | revents = LTTNG_POLL_GETEV(&events, i); | |
3845 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3846 | ||
3847 | /* Thread quit pipe has been closed. Killing thread. */ | |
3848 | ret = check_thread_quit_pipe(pollfd, revents); | |
3849 | if (ret) { | |
3850 | goto error; | |
3851 | } | |
3852 | ||
3853 | /* Event on the registration socket */ | |
3854 | if (pollfd == client_sock) { | |
3855 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3856 | ERR("Client socket poll error"); | |
3857 | goto error; | |
3858 | } | |
3859 | } | |
3860 | } | |
3861 | ||
3862 | DBG("Wait for client response"); | |
3863 | ||
3864 | sock = lttcomm_accept_unix_sock(client_sock); | |
3865 | if (sock < 0) { | |
273ea72c | 3866 | goto error; |
273ea72c DG |
3867 | } |
3868 | ||
be040666 DG |
3869 | /* Set socket option for credentials retrieval */ |
3870 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3871 | if (ret < 0) { | |
3872 | goto error; | |
3873 | } | |
3874 | ||
5eb91c98 | 3875 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3876 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3877 | if (cmd_ctx == NULL) { |
76d7553f | 3878 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3879 | goto error; |
5eb91c98 | 3880 | } |
1d4b027a | 3881 | |
5eb91c98 | 3882 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3883 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3884 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3885 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3886 | goto error; |
3887 | } | |
1d4b027a | 3888 | |
5eb91c98 DG |
3889 | cmd_ctx->llm = NULL; |
3890 | cmd_ctx->session = NULL; | |
1d4b027a | 3891 | |
5eb91c98 DG |
3892 | /* |
3893 | * Data is received from the lttng client. The struct | |
3894 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3895 | * the client. | |
3896 | */ | |
3897 | DBG("Receiving data from client ..."); | |
be040666 DG |
3898 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3899 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3900 | if (ret <= 0) { |
3901 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3902 | ret = close(sock); |
3903 | if (ret) { | |
3904 | PERROR("close"); | |
3905 | } | |
3906 | sock = -1; | |
a2c0da86 | 3907 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3908 | continue; |
3909 | } | |
1d4b027a | 3910 | |
5eb91c98 DG |
3911 | // TODO: Validate cmd_ctx including sanity check for |
3912 | // security purpose. | |
f7776ea7 | 3913 | |
f6a9efaa | 3914 | rcu_thread_online(); |
5eb91c98 DG |
3915 | /* |
3916 | * This function dispatch the work to the kernel or userspace tracer | |
3917 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3918 | * informations for the client. The command context struct contains | |
3919 | * everything this function may needs. | |
3920 | */ | |
3921 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3922 | rcu_thread_offline(); |
5eb91c98 | 3923 | if (ret < 0) { |
bbd973c2 | 3924 | /* |
5eb91c98 | 3925 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3926 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3927 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3928 | */ |
bbd973c2 | 3929 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3930 | continue; |
3931 | } | |
d6e4fca4 | 3932 | |
54d01ffb DG |
3933 | DBG("Sending response (size: %d, retcode: %s)", |
3934 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3935 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3936 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3937 | if (ret < 0) { |
3938 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3939 | } |
1d4b027a | 3940 | |
5eb91c98 | 3941 | /* End of transmission */ |
76d7553f MD |
3942 | ret = close(sock); |
3943 | if (ret) { | |
3944 | PERROR("close"); | |
3945 | } | |
3946 | sock = -1; | |
be040666 DG |
3947 | |
3948 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3949 | } |
3950 | ||
5eb91c98 DG |
3951 | error: |
3952 | DBG("Client thread dying"); | |
273ea72c | 3953 | unlink(client_unix_sock_path); |
76d7553f MD |
3954 | if (client_sock >= 0) { |
3955 | ret = close(client_sock); | |
3956 | if (ret) { | |
3957 | PERROR("close"); | |
3958 | } | |
a4b35e07 MD |
3959 | } |
3960 | if (sock >= 0) { | |
76d7553f MD |
3961 | ret = close(sock); |
3962 | if (ret) { | |
3963 | PERROR("close"); | |
3964 | } | |
a4b35e07 | 3965 | } |
273ea72c | 3966 | |
5eb91c98 | 3967 | lttng_poll_clean(&events); |
a2fb29a5 | 3968 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3969 | |
3970 | rcu_unregister_thread(); | |
1d4b027a DG |
3971 | return NULL; |
3972 | } | |
3973 | ||
3974 | ||
fac6795d DG |
3975 | /* |
3976 | * usage function on stderr | |
3977 | */ | |
3978 | static void usage(void) | |
3979 | { | |
b716ce68 | 3980 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3981 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3982 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3983 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3984 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3985 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3986 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3987 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3988 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3989 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3990 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3991 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3992 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3993 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3994 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3995 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3996 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3997 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3998 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3999 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 4000 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4001 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
4002 | } |
4003 | ||
4004 | /* | |
4005 | * daemon argument parsing | |
4006 | */ | |
4007 | static int parse_args(int argc, char **argv) | |
4008 | { | |
4009 | int c; | |
4010 | ||
4011 | static struct option long_options[] = { | |
4012 | { "client-sock", 1, 0, 'c' }, | |
4013 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
4014 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
4015 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
4016 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
4017 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
4018 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
4019 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
4020 | { "consumerd32-path", 1, 0, 'u' }, | |
4021 | { "consumerd32-libdir", 1, 0, 'U' }, | |
4022 | { "consumerd64-path", 1, 0, 't' }, | |
4023 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 4024 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 4025 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
4026 | { "help", 0, 0, 'h' }, |
4027 | { "group", 1, 0, 'g' }, | |
4028 | { "version", 0, 0, 'V' }, | |
75462a81 | 4029 | { "quiet", 0, 0, 'q' }, |
3f9947db | 4030 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 4031 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 4032 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
4033 | { NULL, 0, 0, 0 } |
4034 | }; | |
4035 | ||
4036 | while (1) { | |
4037 | int option_index = 0; | |
4fba7219 | 4038 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 4039 | long_options, &option_index); |
fac6795d DG |
4040 | if (c == -1) { |
4041 | break; | |
4042 | } | |
4043 | ||
4044 | switch (c) { | |
4045 | case 0: | |
4046 | fprintf(stderr, "option %s", long_options[option_index].name); | |
4047 | if (optarg) { | |
4048 | fprintf(stderr, " with arg %s\n", optarg); | |
4049 | } | |
4050 | break; | |
b716ce68 | 4051 | case 'c': |
fac6795d DG |
4052 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
4053 | break; | |
4054 | case 'a': | |
4055 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
4056 | break; | |
4057 | case 'd': | |
4058 | opt_daemon = 1; | |
4059 | break; | |
4060 | case 'g': | |
fb09408a | 4061 | opt_tracing_group = optarg; |
fac6795d DG |
4062 | break; |
4063 | case 'h': | |
4064 | usage(); | |
4065 | exit(EXIT_FAILURE); | |
4066 | case 'V': | |
4067 | fprintf(stdout, "%s\n", VERSION); | |
4068 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
4069 | case 'S': |
4070 | opt_sig_parent = 1; | |
4071 | break; | |
d6f42150 | 4072 | case 'E': |
3bd1e081 | 4073 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
4074 | break; |
4075 | case 'C': | |
3bd1e081 MD |
4076 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4077 | break; | |
4078 | case 'F': | |
7753dea8 | 4079 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4080 | break; |
4081 | case 'D': | |
7753dea8 MD |
4082 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4083 | break; | |
4084 | case 'H': | |
4085 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4086 | break; | |
4087 | case 'G': | |
4088 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4089 | break; |
4fba7219 DG |
4090 | case 'N': |
4091 | opt_no_kernel = 1; | |
4092 | break; | |
75462a81 | 4093 | case 'q': |
97e19046 | 4094 | lttng_opt_quiet = 1; |
75462a81 | 4095 | break; |
3f9947db | 4096 | case 'v': |
53086306 | 4097 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4098 | lttng_opt_verbose += 1; |
3f9947db | 4099 | break; |
31f73cc9 | 4100 | case 'Z': |
3bd1e081 | 4101 | opt_verbose_consumer += 1; |
31f73cc9 | 4102 | break; |
fb09408a | 4103 | case 'u': |
fc7a59ce | 4104 | consumerd32_bin= optarg; |
ebaeda94 MD |
4105 | break; |
4106 | case 'U': | |
4107 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4108 | break; |
4109 | case 't': | |
fc7a59ce | 4110 | consumerd64_bin = optarg; |
ebaeda94 MD |
4111 | break; |
4112 | case 'T': | |
4113 | consumerd64_libdir = optarg; | |
fb09408a | 4114 | break; |
fac6795d DG |
4115 | default: |
4116 | /* Unknown option or other error. | |
4117 | * Error is printed by getopt, just return */ | |
4118 | return -1; | |
4119 | } | |
4120 | } | |
4121 | ||
4122 | return 0; | |
4123 | } | |
4124 | ||
4125 | /* | |
d063d709 | 4126 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4127 | * apps_sock - The communication socket for all UST apps. |
4128 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4129 | */ |
cf3af59e | 4130 | static int init_daemon_socket(void) |
fac6795d DG |
4131 | { |
4132 | int ret = 0; | |
4133 | mode_t old_umask; | |
4134 | ||
4135 | old_umask = umask(0); | |
4136 | ||
4137 | /* Create client tool unix socket */ | |
d6f42150 DG |
4138 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4139 | if (client_sock < 0) { | |
4140 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4141 | ret = -1; |
4142 | goto end; | |
4143 | } | |
4144 | ||
4145 | /* File permission MUST be 660 */ | |
4146 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4147 | if (ret < 0) { | |
d6f42150 | 4148 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4149 | PERROR("chmod"); |
fac6795d DG |
4150 | goto end; |
4151 | } | |
4152 | ||
4153 | /* Create the application unix socket */ | |
d6f42150 DG |
4154 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4155 | if (apps_sock < 0) { | |
4156 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4157 | ret = -1; |
4158 | goto end; | |
4159 | } | |
4160 | ||
d6f42150 | 4161 | /* File permission MUST be 666 */ |
54d01ffb DG |
4162 | ret = chmod(apps_unix_sock_path, |
4163 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4164 | if (ret < 0) { |
d6f42150 | 4165 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4166 | PERROR("chmod"); |
fac6795d DG |
4167 | goto end; |
4168 | } | |
4169 | ||
4170 | end: | |
4171 | umask(old_umask); | |
4172 | return ret; | |
4173 | } | |
4174 | ||
4175 | /* | |
54d01ffb DG |
4176 | * Check if the global socket is available, and if a daemon is answering at the |
4177 | * other side. If yes, error is returned. | |
fac6795d | 4178 | */ |
cf3af59e | 4179 | static int check_existing_daemon(void) |
fac6795d | 4180 | { |
7d8234d9 | 4181 | /* Is there anybody out there ? */ |
099e26bd | 4182 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4183 | return -EEXIST; |
099e26bd | 4184 | } |
b09c7c76 DG |
4185 | |
4186 | return 0; | |
fac6795d DG |
4187 | } |
4188 | ||
fac6795d | 4189 | /* |
d063d709 | 4190 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4191 | * |
d063d709 | 4192 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4193 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4194 | */ |
be040666 | 4195 | static int set_permissions(char *rundir) |
fac6795d DG |
4196 | { |
4197 | int ret; | |
996b65c8 | 4198 | gid_t gid; |
fac6795d | 4199 | |
996b65c8 MD |
4200 | gid = allowed_group(); |
4201 | if (gid < 0) { | |
be040666 DG |
4202 | WARN("No tracing group detected"); |
4203 | ret = 0; | |
fac6795d DG |
4204 | goto end; |
4205 | } | |
4206 | ||
d6f42150 | 4207 | /* Set lttng run dir */ |
be040666 | 4208 | ret = chown(rundir, 0, gid); |
d6f42150 | 4209 | if (ret < 0) { |
be040666 | 4210 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4211 | PERROR("chown"); |
d6f42150 DG |
4212 | } |
4213 | ||
d1613cf5 | 4214 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4215 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4216 | if (ret < 0) { |
4217 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4218 | PERROR("chmod"); |
d1613cf5 JN |
4219 | } |
4220 | ||
d6f42150 | 4221 | /* lttng client socket path */ |
996b65c8 | 4222 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4223 | if (ret < 0) { |
d6f42150 | 4224 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4225 | PERROR("chown"); |
d6f42150 DG |
4226 | } |
4227 | ||
3bd1e081 MD |
4228 | /* kconsumer error socket path */ |
4229 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4230 | if (ret < 0) { |
3bd1e081 | 4231 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4232 | PERROR("chown"); |
3bd1e081 MD |
4233 | } |
4234 | ||
7753dea8 MD |
4235 | /* 64-bit ustconsumer error socket path */ |
4236 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4237 | if (ret < 0) { | |
4238 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4239 | PERROR("chown"); |
7753dea8 MD |
4240 | } |
4241 | ||
4242 | /* 32-bit ustconsumer compat32 error socket path */ | |
4243 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4244 | if (ret < 0) { |
7753dea8 | 4245 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4246 | PERROR("chown"); |
fac6795d DG |
4247 | } |
4248 | ||
d6f42150 | 4249 | DBG("All permissions are set"); |
e07ae692 | 4250 | |
fac6795d DG |
4251 | end: |
4252 | return ret; | |
4253 | } | |
4254 | ||
7a485870 | 4255 | /* |
d063d709 | 4256 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4257 | * Closed in cleanup(). |
7a485870 DG |
4258 | */ |
4259 | static int create_kernel_poll_pipe(void) | |
4260 | { | |
730389d9 DG |
4261 | int ret, i; |
4262 | ||
4263 | ret = pipe(kernel_poll_pipe); | |
4264 | if (ret < 0) { | |
4265 | PERROR("kernel poll pipe"); | |
4266 | goto error; | |
4267 | } | |
4268 | ||
4269 | for (i = 0; i < 2; i++) { | |
4270 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4271 | if (ret < 0) { | |
4272 | PERROR("fcntl kernel_poll_pipe"); | |
4273 | goto error; | |
4274 | } | |
4275 | } | |
4276 | ||
4277 | error: | |
4278 | return ret; | |
7a485870 DG |
4279 | } |
4280 | ||
099e26bd DG |
4281 | /* |
4282 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4283 | * Closed in cleanup(). |
099e26bd DG |
4284 | */ |
4285 | static int create_apps_cmd_pipe(void) | |
4286 | { | |
730389d9 DG |
4287 | int ret, i; |
4288 | ||
4289 | ret = pipe(apps_cmd_pipe); | |
4290 | if (ret < 0) { | |
4291 | PERROR("apps cmd pipe"); | |
4292 | goto error; | |
4293 | } | |
4294 | ||
4295 | for (i = 0; i < 2; i++) { | |
4296 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4297 | if (ret < 0) { | |
4298 | PERROR("fcntl apps_cmd_pipe"); | |
4299 | goto error; | |
4300 | } | |
4301 | } | |
4302 | ||
4303 | error: | |
4304 | return ret; | |
099e26bd DG |
4305 | } |
4306 | ||
d6f42150 | 4307 | /* |
d063d709 | 4308 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4309 | */ |
67e40797 | 4310 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4311 | { |
4312 | int ret; | |
4313 | ||
67e40797 DG |
4314 | DBG3("Creating LTTng run directory: %s", rundir); |
4315 | ||
d1613cf5 | 4316 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4317 | if (ret < 0) { |
b1f11e69 | 4318 | if (errno != EEXIST) { |
67e40797 | 4319 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4320 | goto error; |
4321 | } else { | |
4322 | ret = 0; | |
4323 | } | |
d6f42150 DG |
4324 | } |
4325 | ||
4326 | error: | |
4327 | return ret; | |
4328 | } | |
4329 | ||
4330 | /* | |
d063d709 DG |
4331 | * Setup sockets and directory needed by the kconsumerd communication with the |
4332 | * session daemon. | |
d6f42150 | 4333 | */ |
67e40797 DG |
4334 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4335 | const char *rundir) | |
d6f42150 DG |
4336 | { |
4337 | int ret; | |
67e40797 | 4338 | char path[PATH_MAX]; |
d6f42150 | 4339 | |
67e40797 | 4340 | switch (consumer_data->type) { |
7753dea8 | 4341 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4342 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4343 | break; |
4344 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4345 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4346 | break; |
4347 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4348 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4349 | break; |
4350 | default: | |
4351 | ERR("Consumer type unknown"); | |
4352 | ret = -EINVAL; | |
4353 | goto error; | |
d6f42150 DG |
4354 | } |
4355 | ||
67e40797 DG |
4356 | DBG2("Creating consumer directory: %s", path); |
4357 | ||
d1613cf5 | 4358 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4359 | if (ret < 0) { |
6beb2242 | 4360 | if (errno != EEXIST) { |
f11e84c2 | 4361 | PERROR("mkdir"); |
3bd1e081 | 4362 | ERR("Failed to create %s", path); |
6beb2242 DG |
4363 | goto error; |
4364 | } | |
f11e84c2 | 4365 | ret = -1; |
d6f42150 DG |
4366 | } |
4367 | ||
4368 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4369 | consumer_data->err_sock = |
4370 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4371 | if (consumer_data->err_sock < 0) { | |
4372 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4373 | ret = -1; |
4374 | goto error; | |
4375 | } | |
4376 | ||
4377 | /* File permission MUST be 660 */ | |
3bd1e081 | 4378 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4379 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4380 | if (ret < 0) { |
3bd1e081 | 4381 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4382 | PERROR("chmod"); |
d6f42150 DG |
4383 | goto error; |
4384 | } | |
4385 | ||
4386 | error: | |
4387 | return ret; | |
4388 | } | |
4389 | ||
fac6795d | 4390 | /* |
d063d709 | 4391 | * Signal handler for the daemon |
cf3af59e | 4392 | * |
54d01ffb DG |
4393 | * Simply stop all worker threads, leaving main() return gracefully after |
4394 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4395 | */ |
4396 | static void sighandler(int sig) | |
4397 | { | |
4398 | switch (sig) { | |
cf3af59e | 4399 | case SIGPIPE: |
af87c45a | 4400 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4401 | return; |
4402 | case SIGINT: | |
af87c45a | 4403 | DBG("SIGINT caught"); |
cf3af59e MD |
4404 | stop_threads(); |
4405 | break; | |
4406 | case SIGTERM: | |
af87c45a | 4407 | DBG("SIGTERM caught"); |
cf3af59e MD |
4408 | stop_threads(); |
4409 | break; | |
4410 | default: | |
4411 | break; | |
fac6795d | 4412 | } |
fac6795d DG |
4413 | } |
4414 | ||
4415 | /* | |
d063d709 | 4416 | * Setup signal handler for : |
1d4b027a | 4417 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4418 | */ |
1d4b027a | 4419 | static int set_signal_handler(void) |
fac6795d | 4420 | { |
1d4b027a DG |
4421 | int ret = 0; |
4422 | struct sigaction sa; | |
4423 | sigset_t sigset; | |
fac6795d | 4424 | |
1d4b027a | 4425 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4426 | PERROR("sigemptyset"); |
1d4b027a DG |
4427 | return ret; |
4428 | } | |
d6f42150 | 4429 | |
1d4b027a DG |
4430 | sa.sa_handler = sighandler; |
4431 | sa.sa_mask = sigset; | |
4432 | sa.sa_flags = 0; | |
4433 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4434 | PERROR("sigaction"); |
1d4b027a | 4435 | return ret; |
d6f42150 DG |
4436 | } |
4437 | ||
1d4b027a | 4438 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4439 | PERROR("sigaction"); |
1d4b027a | 4440 | return ret; |
d6f42150 | 4441 | } |
aaf26714 | 4442 | |
1d4b027a | 4443 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4444 | PERROR("sigaction"); |
1d4b027a | 4445 | return ret; |
8c0faa1d DG |
4446 | } |
4447 | ||
1d4b027a DG |
4448 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4449 | ||
4450 | return ret; | |
fac6795d DG |
4451 | } |
4452 | ||
f3ed775e | 4453 | /* |
d063d709 DG |
4454 | * Set open files limit to unlimited. This daemon can open a large number of |
4455 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4456 | */ |
4457 | static void set_ulimit(void) | |
4458 | { | |
4459 | int ret; | |
4460 | struct rlimit lim; | |
4461 | ||
a88df331 | 4462 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4463 | lim.rlim_cur = 65535; |
4464 | lim.rlim_max = 65535; | |
4465 | ||
4466 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4467 | if (ret < 0) { | |
76d7553f | 4468 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4469 | } |
4470 | } | |
4471 | ||
fac6795d DG |
4472 | /* |
4473 | * main | |
4474 | */ | |
4475 | int main(int argc, char **argv) | |
4476 | { | |
fac6795d DG |
4477 | int ret = 0; |
4478 | void *status; | |
b082db07 | 4479 | const char *home_path; |
fac6795d | 4480 | |
335a95b7 MD |
4481 | init_kernel_workarounds(); |
4482 | ||
f6a9efaa DG |
4483 | rcu_register_thread(); |
4484 | ||
273ea72c | 4485 | /* Create thread quit pipe */ |
cf3af59e MD |
4486 | if ((ret = init_thread_quit_pipe()) < 0) { |
4487 | goto error; | |
273ea72c DG |
4488 | } |
4489 | ||
7753dea8 | 4490 | setup_consumerd_path(); |
fb09408a | 4491 | |
fac6795d DG |
4492 | /* Parse arguments */ |
4493 | progname = argv[0]; | |
4494 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4495 | goto error; |
fac6795d DG |
4496 | } |
4497 | ||
4498 | /* Daemonize */ | |
4499 | if (opt_daemon) { | |
53094c05 DG |
4500 | ret = daemon(0, 0); |
4501 | if (ret < 0) { | |
76d7553f | 4502 | PERROR("daemon"); |
cf3af59e | 4503 | goto error; |
53094c05 | 4504 | } |
fac6795d DG |
4505 | } |
4506 | ||
4507 | /* Check if daemon is UID = 0 */ | |
4508 | is_root = !getuid(); | |
4509 | ||
fac6795d | 4510 | if (is_root) { |
990570ed | 4511 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4512 | |
4513 | /* Create global run dir with root access */ | |
4514 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4515 | if (ret < 0) { |
cf3af59e | 4516 | goto error; |
d6f42150 DG |
4517 | } |
4518 | ||
fac6795d | 4519 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4520 | snprintf(apps_unix_sock_path, PATH_MAX, |
4521 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4522 | } |
4523 | ||
4524 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4525 | snprintf(client_unix_sock_path, PATH_MAX, |
4526 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4527 | } | |
0fdd1e2c DG |
4528 | |
4529 | /* Set global SHM for ust */ | |
4530 | if (strlen(wait_shm_path) == 0) { | |
4531 | snprintf(wait_shm_path, PATH_MAX, | |
4532 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4533 | } | |
67e40797 DG |
4534 | |
4535 | /* Setup kernel consumerd path */ | |
4536 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4537 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4538 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4539 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4540 | |
4541 | DBG2("Kernel consumer err path: %s", | |
4542 | kconsumer_data.err_unix_sock_path); | |
4543 | DBG2("Kernel consumer cmd path: %s", | |
4544 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4545 | } else { |
b082db07 DG |
4546 | home_path = get_home_dir(); |
4547 | if (home_path == NULL) { | |
273ea72c DG |
4548 | /* TODO: Add --socket PATH option */ |
4549 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4550 | ret = -EPERM; |
4551 | goto error; | |
b082db07 DG |
4552 | } |
4553 | ||
67e40797 DG |
4554 | /* |
4555 | * Create rundir from home path. This will create something like | |
4556 | * $HOME/.lttng | |
4557 | */ | |
990570ed | 4558 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4559 | if (ret < 0) { |
4560 | ret = -ENOMEM; | |
4561 | goto error; | |
4562 | } | |
4563 | ||
4564 | ret = create_lttng_rundir(rundir); | |
4565 | if (ret < 0) { | |
4566 | goto error; | |
4567 | } | |
4568 | ||
fac6795d | 4569 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4570 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4571 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4572 | } |
4573 | ||
4574 | /* Set the cli tool unix socket path */ | |
4575 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4576 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4577 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4578 | } |
0fdd1e2c DG |
4579 | |
4580 | /* Set global SHM for ust */ | |
4581 | if (strlen(wait_shm_path) == 0) { | |
4582 | snprintf(wait_shm_path, PATH_MAX, | |
4583 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4584 | } | |
fac6795d DG |
4585 | } |
4586 | ||
5c827ce0 DG |
4587 | /* Set consumer initial state */ |
4588 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4589 | ust_consumerd_state = CONSUMER_STOPPED; | |
4590 | ||
847177cd DG |
4591 | DBG("Client socket path %s", client_unix_sock_path); |
4592 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4593 | DBG("LTTng run directory path: %s", rundir); |
4594 | ||
4595 | /* 32 bits consumerd path setup */ | |
4596 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4597 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4598 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4599 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4600 | |
4601 | DBG2("UST consumer 32 bits err path: %s", | |
4602 | ustconsumer32_data.err_unix_sock_path); | |
4603 | DBG2("UST consumer 32 bits cmd path: %s", | |
4604 | ustconsumer32_data.cmd_unix_sock_path); | |
4605 | ||
4606 | /* 64 bits consumerd path setup */ | |
4607 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4608 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4609 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4610 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4611 | |
4612 | DBG2("UST consumer 64 bits err path: %s", | |
4613 | ustconsumer64_data.err_unix_sock_path); | |
4614 | DBG2("UST consumer 64 bits cmd path: %s", | |
4615 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4616 | |
273ea72c | 4617 | /* |
7d8234d9 | 4618 | * See if daemon already exist. |
fac6795d | 4619 | */ |
7d8234d9 | 4620 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4621 | ERR("Already running daemon.\n"); |
273ea72c | 4622 | /* |
cf3af59e MD |
4623 | * We do not goto exit because we must not cleanup() |
4624 | * because a daemon is already running. | |
ab118b20 | 4625 | */ |
cf3af59e | 4626 | goto error; |
a88df331 DG |
4627 | } |
4628 | ||
1427f9b2 DG |
4629 | /* |
4630 | * Init UST app hash table. Alloc hash table before this point since | |
4631 | * cleanup() can get called after that point. | |
4632 | */ | |
4633 | ust_app_ht_alloc(); | |
4634 | ||
54d01ffb | 4635 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4636 | |
4637 | /* | |
4638 | * These actions must be executed as root. We do that *after* setting up | |
4639 | * the sockets path because we MUST make the check for another daemon using | |
4640 | * those paths *before* trying to set the kernel consumer sockets and init | |
4641 | * kernel tracer. | |
4642 | */ | |
4643 | if (is_root) { | |
67e40797 | 4644 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4645 | if (ret < 0) { |
4646 | goto exit; | |
4647 | } | |
4648 | ||
a88df331 | 4649 | /* Setup kernel tracer */ |
4fba7219 DG |
4650 | if (!opt_no_kernel) { |
4651 | init_kernel_tracer(); | |
4652 | } | |
a88df331 DG |
4653 | |
4654 | /* Set ulimit for open files */ | |
4655 | set_ulimit(); | |
fac6795d | 4656 | } |
4063050c MD |
4657 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4658 | lttng_fd_init(); | |
fac6795d | 4659 | |
67e40797 DG |
4660 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4661 | if (ret < 0) { | |
4662 | goto exit; | |
4663 | } | |
4664 | ||
4665 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4666 | if (ret < 0) { | |
4667 | goto exit; | |
4668 | } | |
4669 | ||
cf3af59e MD |
4670 | if ((ret = set_signal_handler()) < 0) { |
4671 | goto exit; | |
fac6795d DG |
4672 | } |
4673 | ||
d6f42150 | 4674 | /* Setup the needed unix socket */ |
cf3af59e MD |
4675 | if ((ret = init_daemon_socket()) < 0) { |
4676 | goto exit; | |
fac6795d DG |
4677 | } |
4678 | ||
4679 | /* Set credentials to socket */ | |
be040666 | 4680 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4681 | goto exit; |
fac6795d DG |
4682 | } |
4683 | ||
5b8719f5 DG |
4684 | /* Get parent pid if -S, --sig-parent is specified. */ |
4685 | if (opt_sig_parent) { | |
4686 | ppid = getppid(); | |
4687 | } | |
4688 | ||
7a485870 | 4689 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4690 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4691 | goto exit; | |
7a485870 DG |
4692 | } |
4693 | ||
099e26bd DG |
4694 | /* Setup the thread apps communication pipe. */ |
4695 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4696 | goto exit; | |
4697 | } | |
4698 | ||
4699 | /* Init UST command queue. */ | |
4700 | cds_wfq_init(&ust_cmd_queue.queue); | |
4701 | ||
273ea72c | 4702 | /* |
54d01ffb DG |
4703 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4704 | * statically declared in session.c | |
273ea72c | 4705 | */ |
54d01ffb | 4706 | session_list_ptr = session_get_list(); |
b5541356 | 4707 | |
5eb91c98 DG |
4708 | /* Set up max poll set size */ |
4709 | lttng_poll_set_max_size(); | |
4710 | ||
cf3af59e | 4711 | /* Create thread to manage the client socket */ |
099e26bd DG |
4712 | ret = pthread_create(&client_thread, NULL, |
4713 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4714 | if (ret != 0) { |
76d7553f | 4715 | PERROR("pthread_create clients"); |
cf3af59e MD |
4716 | goto exit_client; |
4717 | } | |
fac6795d | 4718 | |
099e26bd DG |
4719 | /* Create thread to dispatch registration */ |
4720 | ret = pthread_create(&dispatch_thread, NULL, | |
4721 | thread_dispatch_ust_registration, (void *) NULL); | |
4722 | if (ret != 0) { | |
76d7553f | 4723 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4724 | goto exit_dispatch; |
4725 | } | |
4726 | ||
4727 | /* Create thread to manage application registration. */ | |
4728 | ret = pthread_create(®_apps_thread, NULL, | |
4729 | thread_registration_apps, (void *) NULL); | |
4730 | if (ret != 0) { | |
76d7553f | 4731 | PERROR("pthread_create registration"); |
099e26bd DG |
4732 | goto exit_reg_apps; |
4733 | } | |
4734 | ||
cf3af59e | 4735 | /* Create thread to manage application socket */ |
54d01ffb DG |
4736 | ret = pthread_create(&apps_thread, NULL, |
4737 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4738 | if (ret != 0) { |
76d7553f | 4739 | PERROR("pthread_create apps"); |
cf3af59e MD |
4740 | goto exit_apps; |
4741 | } | |
fac6795d | 4742 | |
cf3af59e | 4743 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4744 | ret = pthread_create(&kernel_thread, NULL, |
4745 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4746 | if (ret != 0) { |
76d7553f | 4747 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4748 | goto exit_kernel; |
4749 | } | |
7a485870 | 4750 | |
cf3af59e MD |
4751 | ret = pthread_join(kernel_thread, &status); |
4752 | if (ret != 0) { | |
76d7553f | 4753 | PERROR("pthread_join"); |
cf3af59e | 4754 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4755 | } |
4756 | ||
cf3af59e MD |
4757 | exit_kernel: |
4758 | ret = pthread_join(apps_thread, &status); | |
4759 | if (ret != 0) { | |
76d7553f | 4760 | PERROR("pthread_join"); |
cf3af59e MD |
4761 | goto error; /* join error, exit without cleanup */ |
4762 | } | |
fac6795d | 4763 | |
cf3af59e | 4764 | exit_apps: |
099e26bd DG |
4765 | ret = pthread_join(reg_apps_thread, &status); |
4766 | if (ret != 0) { | |
76d7553f | 4767 | PERROR("pthread_join"); |
099e26bd DG |
4768 | goto error; /* join error, exit without cleanup */ |
4769 | } | |
4770 | ||
4771 | exit_reg_apps: | |
4772 | ret = pthread_join(dispatch_thread, &status); | |
4773 | if (ret != 0) { | |
76d7553f | 4774 | PERROR("pthread_join"); |
099e26bd DG |
4775 | goto error; /* join error, exit without cleanup */ |
4776 | } | |
4777 | ||
4778 | exit_dispatch: | |
cf3af59e MD |
4779 | ret = pthread_join(client_thread, &status); |
4780 | if (ret != 0) { | |
76d7553f | 4781 | PERROR("pthread_join"); |
cf3af59e MD |
4782 | goto error; /* join error, exit without cleanup */ |
4783 | } | |
4784 | ||
3bd1e081 | 4785 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4786 | if (ret != 0) { |
76d7553f | 4787 | PERROR("join_consumer"); |
cf3af59e MD |
4788 | goto error; /* join error, exit without cleanup */ |
4789 | } | |
a88df331 | 4790 | |
cf3af59e | 4791 | exit_client: |
a88df331 | 4792 | exit: |
cf3af59e MD |
4793 | /* |
4794 | * cleanup() is called when no other thread is running. | |
4795 | */ | |
f6a9efaa | 4796 | rcu_thread_online(); |
cf3af59e | 4797 | cleanup(); |
f6a9efaa DG |
4798 | rcu_thread_offline(); |
4799 | rcu_unregister_thread(); | |
67e40797 | 4800 | if (!ret) { |
cf3af59e | 4801 | exit(EXIT_SUCCESS); |
67e40797 | 4802 | } |
cf3af59e | 4803 | error: |
5e16da05 | 4804 | exit(EXIT_FAILURE); |
fac6795d | 4805 | } |