Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
8c0faa1d | 24 | #include <semaphore.h> |
fac6795d DG |
25 | #include <signal.h> |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c DG |
35 | #include <sys/wait.h> |
36 | #include <urcu/futex.h> | |
f22d70f0 | 37 | #include <urcu/uatomic.h> |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
990570ed | 41 | #include <common/common.h> |
0ba98ebc | 42 | #include <common/compat/poll.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
db758600 DG |
44 | #include <common/defaults.h> |
45 | #include <common/kernel-consumer/kernel-consumer.h> | |
46 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
099e26bd | 50 | #include "context.h" |
54d01ffb | 51 | #include "event.h" |
099e26bd | 52 | #include "futex.h" |
4771f025 | 53 | #include "kernel.h" |
096102bd | 54 | #include "modprobe.h" |
0fdd1e2c | 55 | #include "shm.h" |
1e307fab | 56 | #include "ust-ctl.h" |
8e68d1c8 | 57 | #include "utils.h" |
4063050c | 58 | #include "fd-limit.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
3bd1e081 MD |
62 | struct consumer_data { |
63 | enum lttng_consumer_type type; | |
64 | ||
65 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
66 | sem_t sem; | |
67 | ||
68 | /* Mutex to control consumerd pid assignation */ | |
69 | pthread_mutex_t pid_mutex; | |
70 | pid_t pid; | |
71 | ||
72 | int err_sock; | |
73 | int cmd_sock; | |
74 | ||
75 | /* consumer error and command Unix socket path */ | |
76 | char err_unix_sock_path[PATH_MAX]; | |
77 | char cmd_unix_sock_path[PATH_MAX]; | |
78 | }; | |
79 | ||
75462a81 | 80 | /* Const values */ |
686204ab | 81 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 82 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
83 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
84 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
85 | ||
fac6795d DG |
86 | const char *progname; |
87 | const char *opt_tracing_group; | |
5b8719f5 | 88 | static int opt_sig_parent; |
97e19046 | 89 | static int opt_verbose_consumer; |
fac6795d | 90 | static int opt_daemon; |
4fba7219 | 91 | static int opt_no_kernel; |
fac6795d | 92 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 93 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 94 | static char *rundir; |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
99 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
100 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
101 | .err_sock = -1, |
102 | .cmd_sock = -1, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
108 | .err_sock = -1, |
109 | .cmd_sock = -1, | |
7753dea8 MD |
110 | }; |
111 | static struct consumer_data ustconsumer32_data = { | |
112 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
113 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
114 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
115 | .err_sock = -1, |
116 | .cmd_sock = -1, | |
3bd1e081 MD |
117 | }; |
118 | ||
099e26bd | 119 | static int dispatch_thread_exit; |
fac6795d | 120 | |
54d01ffb DG |
121 | /* Global application Unix socket path */ |
122 | static char apps_unix_sock_path[PATH_MAX]; | |
123 | /* Global client Unix socket path */ | |
124 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
125 | /* global wait shm path for UST */ |
126 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 127 | |
1d4b027a | 128 | /* Sockets and FDs */ |
a4b35e07 MD |
129 | static int client_sock = -1; |
130 | static int apps_sock = -1; | |
131 | static int kernel_tracer_fd = -1; | |
76d7553f | 132 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 133 | |
273ea72c DG |
134 | /* |
135 | * Quit pipe for all threads. This permits a single cancellation point | |
136 | * for all threads when receiving an event on the pipe. | |
137 | */ | |
76d7553f | 138 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 139 | |
099e26bd DG |
140 | /* |
141 | * This pipe is used to inform the thread managing application communication | |
142 | * that a command is queued and ready to be processed. | |
143 | */ | |
76d7553f | 144 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 145 | |
1d4b027a | 146 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 147 | static pthread_t apps_thread; |
099e26bd | 148 | static pthread_t reg_apps_thread; |
1d4b027a | 149 | static pthread_t client_thread; |
7a485870 | 150 | static pthread_t kernel_thread; |
099e26bd | 151 | static pthread_t dispatch_thread; |
5eb91c98 | 152 | |
fac6795d | 153 | |
099e26bd DG |
154 | /* |
155 | * UST registration command queue. This queue is tied with a futex and uses a N | |
156 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
157 | * | |
158 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
159 | * this queue and the wait/wake scheme. | |
160 | */ | |
161 | static struct ust_cmd_queue ust_cmd_queue; | |
162 | ||
b5541356 DG |
163 | /* |
164 | * Pointer initialized before thread creation. | |
165 | * | |
166 | * This points to the tracing session list containing the session count and a | |
167 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
168 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 169 | * |
d063d709 | 170 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 171 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
172 | */ |
173 | static struct ltt_session_list *session_list_ptr; | |
174 | ||
7753dea8 MD |
175 | int ust_consumerd64_fd = -1; |
176 | int ust_consumerd32_fd = -1; | |
177 | ||
fb6f1fa2 YB |
178 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
179 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
180 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
181 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 182 | |
f22d70f0 DG |
183 | /* |
184 | * Consumer daemon state which is changed when spawning it, killing it or in | |
185 | * case of a fatal error. | |
186 | */ | |
187 | enum consumerd_state { | |
188 | CONSUMER_STARTED = 1, | |
189 | CONSUMER_STOPPED = 2, | |
190 | CONSUMER_ERROR = 3, | |
191 | }; | |
192 | ||
193 | /* | |
194 | * This consumer daemon state is used to validate if a client command will be | |
195 | * able to reach the consumer. If not, the client is informed. For instance, | |
196 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
197 | * error to the client. | |
198 | * | |
199 | * The following example shows a possible race condition of this scheme: | |
200 | * | |
201 | * consumer thread error happens | |
202 | * client cmd arrives | |
203 | * client cmd checks state -> still OK | |
204 | * consumer thread exit, sets error | |
205 | * client cmd try to talk to consumer | |
206 | * ... | |
207 | * | |
208 | * However, since the consumer is a different daemon, we have no way of making | |
209 | * sure the command will reach it safely even with this state flag. This is why | |
210 | * we consider that up to the state validation during command processing, the | |
211 | * command is safe. After that, we can not guarantee the correctness of the | |
212 | * client request vis-a-vis the consumer. | |
213 | */ | |
214 | static enum consumerd_state ust_consumerd_state; | |
215 | static enum consumerd_state kernel_consumerd_state; | |
216 | ||
fb09408a | 217 | static |
7753dea8 | 218 | void setup_consumerd_path(void) |
fb09408a | 219 | { |
fc7a59ce | 220 | const char *bin, *libdir; |
fb09408a | 221 | |
7753dea8 MD |
222 | /* |
223 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
224 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
225 | * has not been defined. | |
7753dea8 | 226 | */ |
ebaeda94 | 227 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
228 | if (!consumerd32_bin[0]) { |
229 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
230 | } |
231 | if (!consumerd32_libdir[0]) { | |
232 | consumerd32_libdir = INSTALL_LIB_PATH; | |
233 | } | |
234 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
235 | if (!consumerd64_bin[0]) { |
236 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 237 | } |
ebaeda94 MD |
238 | if (!consumerd64_libdir[0]) { |
239 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
240 | } |
241 | #else | |
242 | #error "Unknown bitness" | |
243 | #endif | |
244 | ||
fb09408a MD |
245 | /* |
246 | * runtime env. var. overrides the build default. | |
247 | */ | |
fc7a59ce AM |
248 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
249 | if (bin) { | |
250 | consumerd32_bin = bin; | |
7753dea8 | 251 | } |
fc7a59ce AM |
252 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
253 | if (bin) { | |
254 | consumerd64_bin = bin; | |
ebaeda94 | 255 | } |
72f579ee | 256 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
257 | if (libdir) { |
258 | consumerd32_libdir = libdir; | |
259 | } | |
72f579ee | 260 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
261 | if (libdir) { |
262 | consumerd64_libdir = libdir; | |
fb09408a MD |
263 | } |
264 | } | |
265 | ||
5eb91c98 DG |
266 | /* |
267 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
268 | */ | |
269 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
270 | unsigned int size) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | if (events == NULL || size == 0) { | |
275 | ret = -1; | |
276 | goto error; | |
277 | } | |
278 | ||
279 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
280 | if (ret < 0) { | |
281 | goto error; | |
282 | } | |
283 | ||
284 | /* Add quit pipe */ | |
285 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
286 | if (ret < 0) { | |
287 | goto error; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | ||
292 | error: | |
293 | return ret; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Check if the thread quit pipe was triggered. | |
298 | * | |
299 | * Return 1 if it was triggered else 0; | |
300 | */ | |
301 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
302 | { | |
303 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
304 | return 1; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
0fdd1e2c DG |
310 | /* |
311 | * Return group ID of the tracing group or -1 if not found. | |
312 | */ | |
996b65c8 MD |
313 | static gid_t allowed_group(void) |
314 | { | |
315 | struct group *grp; | |
316 | ||
274e143b MD |
317 | if (opt_tracing_group) { |
318 | grp = getgrnam(opt_tracing_group); | |
319 | } else { | |
320 | grp = getgrnam(default_tracing_group); | |
321 | } | |
996b65c8 MD |
322 | if (!grp) { |
323 | return -1; | |
324 | } else { | |
325 | return grp->gr_gid; | |
326 | } | |
327 | } | |
328 | ||
273ea72c | 329 | /* |
5eb91c98 | 330 | * Init thread quit pipe. |
273ea72c DG |
331 | * |
332 | * Return -1 on error or 0 if all pipes are created. | |
333 | */ | |
334 | static int init_thread_quit_pipe(void) | |
335 | { | |
730389d9 | 336 | int ret, i; |
273ea72c | 337 | |
730389d9 | 338 | ret = pipe(thread_quit_pipe); |
273ea72c | 339 | if (ret < 0) { |
730389d9 | 340 | PERROR("thread quit pipe"); |
273ea72c DG |
341 | goto error; |
342 | } | |
343 | ||
730389d9 DG |
344 | for (i = 0; i < 2; i++) { |
345 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
346 | if (ret < 0) { | |
347 | PERROR("fcntl"); | |
348 | goto error; | |
349 | } | |
350 | } | |
351 | ||
273ea72c DG |
352 | error: |
353 | return ret; | |
354 | } | |
355 | ||
fac6795d | 356 | /* |
d063d709 DG |
357 | * Complete teardown of a kernel session. This free all data structure related |
358 | * to a kernel session and update counter. | |
fac6795d | 359 | */ |
1d4b027a | 360 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 361 | { |
8f7a84dd | 362 | if (!session->kernel_session) { |
99bab54f | 363 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 364 | return; |
8f7a84dd DG |
365 | } |
366 | ||
84ea9c99 | 367 | DBG("Tearing down kernel session"); |
d9800920 | 368 | |
84ea9c99 MD |
369 | /* |
370 | * If a custom kernel consumer was registered, close the socket before | |
371 | * tearing down the complete kernel session structure | |
372 | */ | |
03550b58 MD |
373 | if (kconsumer_data.cmd_sock >= 0 && |
374 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 375 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 376 | } |
84ea9c99 MD |
377 | |
378 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
379 | } |
380 | ||
f6a9efaa DG |
381 | /* |
382 | * Complete teardown of all UST sessions. This will free everything on his path | |
383 | * and destroy the core essence of all ust sessions :) | |
384 | */ | |
385 | static void teardown_ust_session(struct ltt_session *session) | |
386 | { | |
84cd17c6 MD |
387 | int ret; |
388 | ||
8f7a84dd | 389 | if (!session->ust_session) { |
99bab54f | 390 | DBG3("No UST session when tearing down session"); |
f470a390 | 391 | return; |
8f7a84dd DG |
392 | } |
393 | ||
84ea9c99 | 394 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 395 | |
84cd17c6 MD |
396 | ret = ust_app_destroy_trace_all(session->ust_session); |
397 | if (ret) { | |
398 | ERR("Error in ust_app_destroy_trace_all"); | |
399 | } | |
8f7a84dd | 400 | |
f6a9efaa DG |
401 | trace_ust_destroy_session(session->ust_session); |
402 | } | |
403 | ||
099e26bd DG |
404 | /* |
405 | * Stop all threads by closing the thread quit pipe. | |
406 | */ | |
cf3af59e MD |
407 | static void stop_threads(void) |
408 | { | |
5eb91c98 DG |
409 | int ret; |
410 | ||
cf3af59e MD |
411 | /* Stopping all threads */ |
412 | DBG("Terminating all threads"); | |
54d01ffb | 413 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
414 | if (ret < 0) { |
415 | ERR("write error on thread quit pipe"); | |
416 | } | |
417 | ||
099e26bd DG |
418 | /* Dispatch thread */ |
419 | dispatch_thread_exit = 1; | |
420 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
421 | } |
422 | ||
fac6795d | 423 | /* |
d063d709 | 424 | * Cleanup the daemon |
fac6795d | 425 | */ |
cf3af59e | 426 | static void cleanup(void) |
fac6795d | 427 | { |
76d7553f | 428 | int ret, i; |
1d4b027a | 429 | char *cmd; |
af9737e9 | 430 | struct ltt_session *sess, *stmp; |
fac6795d | 431 | |
1d4b027a | 432 | DBG("Cleaning up"); |
e07ae692 | 433 | |
67e40797 DG |
434 | DBG("Removing %s directory", rundir); |
435 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
436 | if (ret < 0) { | |
437 | ERR("asprintf failed. Something is really wrong!"); | |
438 | } | |
5461b305 | 439 | |
67e40797 DG |
440 | /* Remove lttng run directory */ |
441 | ret = system(cmd); | |
442 | if (ret < 0) { | |
443 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 444 | } |
67e40797 | 445 | free(cmd); |
5461b305 | 446 | |
99bab54f | 447 | DBG("Cleaning up all sessions"); |
fac6795d | 448 | |
b5541356 | 449 | /* Destroy session list mutex */ |
273ea72c DG |
450 | if (session_list_ptr != NULL) { |
451 | pthread_mutex_destroy(&session_list_ptr->lock); | |
452 | ||
453 | /* Cleanup ALL session */ | |
54d01ffb DG |
454 | cds_list_for_each_entry_safe(sess, stmp, |
455 | &session_list_ptr->head, list) { | |
273ea72c | 456 | teardown_kernel_session(sess); |
f6a9efaa DG |
457 | teardown_ust_session(sess); |
458 | free(sess); | |
273ea72c DG |
459 | } |
460 | } | |
461 | ||
099e26bd | 462 | DBG("Closing all UST sockets"); |
56fff090 | 463 | ust_app_clean_list(); |
099e26bd | 464 | |
3bd1e081 | 465 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 466 | |
4fba7219 DG |
467 | if (is_root && !opt_no_kernel) { |
468 | DBG2("Closing kernel fd"); | |
a4b35e07 | 469 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
470 | ret = close(kernel_tracer_fd); |
471 | if (ret) { | |
472 | PERROR("close"); | |
473 | } | |
a4b35e07 | 474 | } |
2f50c8a3 | 475 | DBG("Unloading kernel modules"); |
096102bd | 476 | modprobe_remove_lttng_all(); |
2f50c8a3 | 477 | } |
5eb91c98 | 478 | |
76d7553f MD |
479 | /* |
480 | * Closing all pipes used for communication between threads. | |
481 | */ | |
482 | for (i = 0; i < 2; i++) { | |
483 | if (kernel_poll_pipe[i] >= 0) { | |
484 | ret = close(kernel_poll_pipe[i]); | |
485 | if (ret) { | |
486 | PERROR("close"); | |
487 | } | |
76d7553f MD |
488 | } |
489 | } | |
490 | for (i = 0; i < 2; i++) { | |
491 | if (thread_quit_pipe[i] >= 0) { | |
492 | ret = close(thread_quit_pipe[i]); | |
493 | if (ret) { | |
494 | PERROR("close"); | |
495 | } | |
496 | } | |
497 | } | |
498 | for (i = 0; i < 2; i++) { | |
499 | if (apps_cmd_pipe[i] >= 0) { | |
500 | ret = close(apps_cmd_pipe[i]); | |
501 | if (ret) { | |
502 | PERROR("close"); | |
503 | } | |
504 | } | |
505 | } | |
421cb601 DG |
506 | |
507 | /* <fun> */ | |
f56a39af | 508 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
509 | "Matthew, BEET driven development works!%c[%dm", |
510 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
511 | /* </fun> */ | |
fac6795d DG |
512 | } |
513 | ||
e065084a | 514 | /* |
d063d709 | 515 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 516 | * |
d063d709 | 517 | * Return lttcomm error code. |
e065084a DG |
518 | */ |
519 | static int send_unix_sock(int sock, void *buf, size_t len) | |
520 | { | |
521 | /* Check valid length */ | |
522 | if (len <= 0) { | |
523 | return -1; | |
524 | } | |
525 | ||
526 | return lttcomm_send_unix_sock(sock, buf, len); | |
527 | } | |
528 | ||
5461b305 | 529 | /* |
d063d709 | 530 | * Free memory of a command context structure. |
5461b305 | 531 | */ |
a2fb29a5 | 532 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 533 | { |
a2fb29a5 DG |
534 | DBG("Clean command context structure"); |
535 | if (*cmd_ctx) { | |
536 | if ((*cmd_ctx)->llm) { | |
537 | free((*cmd_ctx)->llm); | |
5461b305 | 538 | } |
a2fb29a5 DG |
539 | if ((*cmd_ctx)->lsm) { |
540 | free((*cmd_ctx)->lsm); | |
5461b305 | 541 | } |
a2fb29a5 DG |
542 | free(*cmd_ctx); |
543 | *cmd_ctx = NULL; | |
5461b305 DG |
544 | } |
545 | } | |
546 | ||
f3ed775e | 547 | /* |
d063d709 | 548 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 549 | */ |
2bdd86d4 | 550 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
551 | int sock, struct ltt_kernel_channel *channel, |
552 | uid_t uid, gid_t gid) | |
f3ed775e DG |
553 | { |
554 | int ret; | |
f3ed775e | 555 | struct ltt_kernel_stream *stream; |
3bd1e081 | 556 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 557 | |
3bd1e081 | 558 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 559 | channel->channel->name); |
f3ed775e | 560 | |
3bd1e081 MD |
561 | /* Send channel */ |
562 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
563 | lkm.u.channel.channel_key = channel->fd; | |
564 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
565 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 566 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 567 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 568 | if (ret < 0) { |
76d7553f | 569 | PERROR("send consumer channel"); |
f3ed775e DG |
570 | goto error; |
571 | } | |
572 | ||
3bd1e081 | 573 | /* Send streams */ |
7a485870 | 574 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
575 | if (!stream->fd) { |
576 | continue; | |
577 | } | |
578 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
579 | lkm.u.stream.channel_key = channel->fd; | |
580 | lkm.u.stream.stream_key = stream->fd; | |
581 | lkm.u.stream.state = stream->state; | |
582 | lkm.u.stream.output = channel->channel->attr.output; | |
583 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
584 | lkm.u.stream.uid = uid; |
585 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
586 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
587 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
588 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
589 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
590 | if (ret < 0) { | |
76d7553f | 591 | PERROR("send consumer stream"); |
3bd1e081 MD |
592 | goto error; |
593 | } | |
594 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
595 | if (ret < 0) { | |
76d7553f | 596 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 597 | goto error; |
f3ed775e DG |
598 | } |
599 | } | |
600 | ||
3bd1e081 | 601 | DBG("consumer channel streams sent"); |
f3ed775e DG |
602 | |
603 | return 0; | |
604 | ||
605 | error: | |
606 | return ret; | |
607 | } | |
608 | ||
609 | /* | |
d063d709 | 610 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 611 | */ |
2bdd86d4 | 612 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 613 | struct ltt_kernel_session *session) |
f3ed775e DG |
614 | { |
615 | int ret; | |
616 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
617 | struct lttcomm_consumer_msg lkm; |
618 | int sock = session->consumer_fd; | |
7a485870 DG |
619 | |
620 | DBG("Sending metadata stream fd"); | |
621 | ||
03550b58 MD |
622 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
623 | if (session->consumer_fd < 0) { | |
3bd1e081 | 624 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
625 | } |
626 | ||
03550b58 | 627 | if (session->metadata_stream_fd >= 0) { |
3bd1e081 MD |
628 | /* Send metadata channel fd */ |
629 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
630 | lkm.u.channel.channel_key = session->metadata->fd; | |
631 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
632 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
032b44f0 | 633 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 MD |
634 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
635 | if (ret < 0) { | |
76d7553f | 636 | PERROR("send consumer channel"); |
3bd1e081 MD |
637 | goto error; |
638 | } | |
639 | ||
640 | /* Send metadata stream fd */ | |
641 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
642 | lkm.u.stream.channel_key = session->metadata->fd; | |
643 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
644 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
645 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
646 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
647 | lkm.u.stream.uid = session->uid; |
648 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
649 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
650 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
651 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
652 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
653 | if (ret < 0) { | |
76d7553f | 654 | PERROR("send consumer stream"); |
3bd1e081 MD |
655 | goto error; |
656 | } | |
657 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 658 | if (ret < 0) { |
76d7553f | 659 | PERROR("send consumer stream"); |
7a485870 DG |
660 | goto error; |
661 | } | |
662 | } | |
f3ed775e | 663 | |
f3ed775e | 664 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
665 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
666 | session->uid, session->gid); | |
2bdd86d4 MD |
667 | if (ret < 0) { |
668 | goto error; | |
669 | } | |
670 | } | |
671 | ||
672 | DBG("consumer fds (metadata and channel streams) sent"); | |
673 | ||
674 | return 0; | |
675 | ||
676 | error: | |
677 | return ret; | |
678 | } | |
679 | ||
fac6795d | 680 | /* |
0fdd1e2c | 681 | * Notify UST applications using the shm mmap futex. |
fac6795d | 682 | */ |
0fdd1e2c | 683 | static int notify_ust_apps(int active) |
fac6795d | 684 | { |
0fdd1e2c | 685 | char *wait_shm_mmap; |
fac6795d | 686 | |
0fdd1e2c | 687 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 688 | |
0fdd1e2c DG |
689 | /* See shm.c for this call implying mmap, shm and futex calls */ |
690 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
691 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
692 | goto error; |
693 | } | |
694 | ||
0fdd1e2c DG |
695 | /* Wake waiting process */ |
696 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
697 | ||
698 | /* Apps notified successfully */ | |
699 | return 0; | |
fac6795d DG |
700 | |
701 | error: | |
0fdd1e2c | 702 | return -1; |
fac6795d DG |
703 | } |
704 | ||
e065084a | 705 | /* |
d063d709 DG |
706 | * Setup the outgoing data buffer for the response (llm) by allocating the |
707 | * right amount of memory and copying the original information from the lsm | |
708 | * structure. | |
ca95a216 | 709 | * |
d063d709 | 710 | * Return total size of the buffer pointed by buf. |
ca95a216 | 711 | */ |
5461b305 | 712 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 713 | { |
f3ed775e | 714 | int ret, buf_size; |
ca95a216 | 715 | |
f3ed775e | 716 | buf_size = size; |
5461b305 | 717 | |
ba7f0ae5 | 718 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 719 | if (cmd_ctx->llm == NULL) { |
76d7553f | 720 | PERROR("zmalloc"); |
5461b305 | 721 | ret = -ENOMEM; |
ca95a216 DG |
722 | goto error; |
723 | } | |
724 | ||
5461b305 DG |
725 | /* Copy common data */ |
726 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 727 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 728 | |
5461b305 DG |
729 | cmd_ctx->llm->data_size = size; |
730 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
731 | ||
ca95a216 DG |
732 | return buf_size; |
733 | ||
734 | error: | |
735 | return ret; | |
736 | } | |
737 | ||
7a485870 | 738 | /* |
5eb91c98 | 739 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 740 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 741 | */ |
5eb91c98 | 742 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 743 | { |
5eb91c98 | 744 | int ret; |
7a485870 DG |
745 | struct ltt_session *session; |
746 | struct ltt_kernel_channel *channel; | |
747 | ||
5eb91c98 | 748 | DBG("Updating kernel poll set"); |
7a485870 | 749 | |
54d01ffb | 750 | session_lock_list(); |
b5541356 | 751 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 752 | session_lock(session); |
7a485870 | 753 | if (session->kernel_session == NULL) { |
54d01ffb | 754 | session_unlock(session); |
7a485870 DG |
755 | continue; |
756 | } | |
7a485870 | 757 | |
54d01ffb DG |
758 | cds_list_for_each_entry(channel, |
759 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
760 | /* Add channel fd to the kernel poll set */ |
761 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
762 | if (ret < 0) { | |
54d01ffb | 763 | session_unlock(session); |
5eb91c98 DG |
764 | goto error; |
765 | } | |
766 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 767 | } |
54d01ffb | 768 | session_unlock(session); |
7a485870 | 769 | } |
54d01ffb | 770 | session_unlock_list(); |
7a485870 | 771 | |
5eb91c98 | 772 | return 0; |
7a485870 DG |
773 | |
774 | error: | |
54d01ffb | 775 | session_unlock_list(); |
7a485870 DG |
776 | return -1; |
777 | } | |
778 | ||
779 | /* | |
54d01ffb | 780 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 781 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 782 | * |
d063d709 | 783 | * Useful for CPU hotplug feature. |
7a485870 | 784 | */ |
2bdd86d4 | 785 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
786 | { |
787 | int ret = 0; | |
788 | struct ltt_session *session; | |
789 | struct ltt_kernel_channel *channel; | |
790 | ||
791 | DBG("Updating kernel streams for channel fd %d", fd); | |
792 | ||
54d01ffb | 793 | session_lock_list(); |
b5541356 | 794 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 795 | session_lock(session); |
7a485870 | 796 | if (session->kernel_session == NULL) { |
54d01ffb | 797 | session_unlock(session); |
7a485870 DG |
798 | continue; |
799 | } | |
d9800920 | 800 | |
03550b58 MD |
801 | /* This is not suppose to be -1 but this is an extra security check */ |
802 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 803 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
804 | } |
805 | ||
5eb91c98 DG |
806 | cds_list_for_each_entry(channel, |
807 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
808 | if (channel->fd == fd) { |
809 | DBG("Channel found, updating kernel streams"); | |
810 | ret = kernel_open_channel_stream(channel); | |
811 | if (ret < 0) { | |
b3c750d2 | 812 | goto error; |
7a485870 | 813 | } |
d9800920 | 814 | |
7a485870 | 815 | /* |
5eb91c98 DG |
816 | * Have we already sent fds to the consumer? If yes, it means |
817 | * that tracing is started so it is safe to send our updated | |
818 | * stream fds. | |
7a485870 | 819 | */ |
3bd1e081 | 820 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 821 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
822 | session->kernel_session->consumer_fd, channel, |
823 | session->uid, session->gid); | |
7a485870 | 824 | if (ret < 0) { |
b3c750d2 | 825 | goto error; |
7a485870 DG |
826 | } |
827 | } | |
b3c750d2 | 828 | goto error; |
7a485870 DG |
829 | } |
830 | } | |
54d01ffb | 831 | session_unlock(session); |
7a485870 | 832 | } |
54d01ffb | 833 | session_unlock_list(); |
b3c750d2 | 834 | return ret; |
7a485870 | 835 | |
b3c750d2 | 836 | error: |
54d01ffb DG |
837 | session_unlock(session); |
838 | session_unlock_list(); | |
7a485870 DG |
839 | return ret; |
840 | } | |
841 | ||
487cf67c DG |
842 | /* |
843 | * For each tracing session, update newly registered apps. | |
844 | */ | |
845 | static void update_ust_app(int app_sock) | |
846 | { | |
847 | struct ltt_session *sess, *stmp; | |
848 | ||
4ee14516 DG |
849 | session_lock_list(); |
850 | ||
487cf67c DG |
851 | /* For all tracing session(s) */ |
852 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 853 | session_lock(sess); |
421cb601 DG |
854 | if (sess->ust_session) { |
855 | ust_app_global_update(sess->ust_session, app_sock); | |
856 | } | |
4ee14516 | 857 | session_unlock(sess); |
487cf67c | 858 | } |
4ee14516 DG |
859 | |
860 | session_unlock_list(); | |
487cf67c DG |
861 | } |
862 | ||
7a485870 | 863 | /* |
d063d709 | 864 | * This thread manage event coming from the kernel. |
7a485870 | 865 | * |
d063d709 DG |
866 | * Features supported in this thread: |
867 | * -) CPU Hotplug | |
7a485870 DG |
868 | */ |
869 | static void *thread_manage_kernel(void *data) | |
870 | { | |
5eb91c98 DG |
871 | int ret, i, pollfd, update_poll_flag = 1; |
872 | uint32_t revents, nb_fd; | |
7a485870 | 873 | char tmp; |
5eb91c98 | 874 | struct lttng_poll_event events; |
7a485870 DG |
875 | |
876 | DBG("Thread manage kernel started"); | |
877 | ||
5eb91c98 DG |
878 | ret = create_thread_poll_set(&events, 2); |
879 | if (ret < 0) { | |
76d7553f | 880 | goto error_poll_create; |
5eb91c98 DG |
881 | } |
882 | ||
883 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
884 | if (ret < 0) { | |
885 | goto error; | |
886 | } | |
887 | ||
7a485870 DG |
888 | while (1) { |
889 | if (update_poll_flag == 1) { | |
5f822d0a DG |
890 | /* |
891 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
892 | * quit pipe and the kernel pipe. | |
893 | */ | |
894 | events.nb_fd = 2; | |
895 | ||
5eb91c98 DG |
896 | ret = update_kernel_poll(&events); |
897 | if (ret < 0) { | |
7a485870 DG |
898 | goto error; |
899 | } | |
900 | update_poll_flag = 0; | |
901 | } | |
902 | ||
5eb91c98 DG |
903 | nb_fd = LTTNG_POLL_GETNB(&events); |
904 | ||
905 | DBG("Thread kernel polling on %d fds", nb_fd); | |
906 | ||
907 | /* Zeroed the poll events */ | |
908 | lttng_poll_reset(&events); | |
7a485870 DG |
909 | |
910 | /* Poll infinite value of time */ | |
88f2b785 | 911 | restart: |
5eb91c98 | 912 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 913 | if (ret < 0) { |
88f2b785 MD |
914 | /* |
915 | * Restart interrupted system call. | |
916 | */ | |
917 | if (errno == EINTR) { | |
918 | goto restart; | |
919 | } | |
7a485870 DG |
920 | goto error; |
921 | } else if (ret == 0) { | |
922 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
923 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
924 | "This should not have happened! Continuing..."); | |
7a485870 DG |
925 | continue; |
926 | } | |
927 | ||
5eb91c98 DG |
928 | for (i = 0; i < nb_fd; i++) { |
929 | /* Fetch once the poll data */ | |
930 | revents = LTTNG_POLL_GETEV(&events, i); | |
931 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 932 | |
5eb91c98 DG |
933 | /* Thread quit pipe has been closed. Killing thread. */ |
934 | ret = check_thread_quit_pipe(pollfd, revents); | |
935 | if (ret) { | |
936 | goto error; | |
937 | } | |
7a485870 | 938 | |
5eb91c98 DG |
939 | /* Check for data on kernel pipe */ |
940 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
941 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
942 | update_poll_flag = 1; | |
943 | continue; | |
944 | } else { | |
945 | /* | |
946 | * New CPU detected by the kernel. Adding kernel stream to | |
947 | * kernel session and updating the kernel consumer | |
948 | */ | |
949 | if (revents & LPOLLIN) { | |
2bdd86d4 | 950 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
951 | if (ret < 0) { |
952 | continue; | |
953 | } | |
954 | break; | |
955 | /* | |
956 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
957 | * and unregister kernel stream at this point. | |
958 | */ | |
7a485870 | 959 | } |
7a485870 DG |
960 | } |
961 | } | |
962 | } | |
963 | ||
964 | error: | |
5eb91c98 | 965 | lttng_poll_clean(&events); |
76d7553f MD |
966 | error_poll_create: |
967 | DBG("Kernel thread dying"); | |
7a485870 DG |
968 | return NULL; |
969 | } | |
970 | ||
1d4b027a | 971 | /* |
3bd1e081 | 972 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 973 | */ |
3bd1e081 | 974 | static void *thread_manage_consumer(void *data) |
1d4b027a | 975 | { |
76d7553f | 976 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 977 | uint32_t revents, nb_fd; |
1d4b027a | 978 | enum lttcomm_return_code code; |
5eb91c98 | 979 | struct lttng_poll_event events; |
3bd1e081 | 980 | struct consumer_data *consumer_data = data; |
1d4b027a | 981 | |
3bd1e081 | 982 | DBG("[thread] Manage consumer started"); |
1d4b027a | 983 | |
3bd1e081 | 984 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 985 | if (ret < 0) { |
76d7553f | 986 | goto error_listen; |
1d4b027a DG |
987 | } |
988 | ||
5eb91c98 DG |
989 | /* |
990 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
991 | * Nothing more will be added to this poll set. | |
992 | */ | |
993 | ret = create_thread_poll_set(&events, 2); | |
994 | if (ret < 0) { | |
76d7553f | 995 | goto error_poll; |
5eb91c98 | 996 | } |
273ea72c | 997 | |
3bd1e081 | 998 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
999 | if (ret < 0) { |
1000 | goto error; | |
1001 | } | |
1002 | ||
1003 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
1004 | |
1005 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1006 | restart: |
5eb91c98 | 1007 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1008 | if (ret < 0) { |
88f2b785 MD |
1009 | /* |
1010 | * Restart interrupted system call. | |
1011 | */ | |
1012 | if (errno == EINTR) { | |
1013 | goto restart; | |
1014 | } | |
273ea72c DG |
1015 | goto error; |
1016 | } | |
1017 | ||
5eb91c98 DG |
1018 | for (i = 0; i < nb_fd; i++) { |
1019 | /* Fetch once the poll data */ | |
1020 | revents = LTTNG_POLL_GETEV(&events, i); | |
1021 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1022 | ||
1023 | /* Thread quit pipe has been closed. Killing thread. */ | |
1024 | ret = check_thread_quit_pipe(pollfd, revents); | |
1025 | if (ret) { | |
1026 | goto error; | |
1027 | } | |
1028 | ||
1029 | /* Event on the registration socket */ | |
3bd1e081 | 1030 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1031 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1032 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1033 | goto error; |
1034 | } | |
1035 | } | |
273ea72c DG |
1036 | } |
1037 | ||
3bd1e081 | 1038 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1039 | if (sock < 0) { |
1040 | goto error; | |
1041 | } | |
1042 | ||
3bd1e081 | 1043 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1044 | |
712ea556 | 1045 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1046 | ret = lttcomm_recv_unix_sock(sock, &code, |
1047 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1048 | if (ret <= 0) { |
1049 | goto error; | |
1050 | } | |
1051 | ||
3bd1e081 MD |
1052 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1053 | consumer_data->cmd_sock = | |
1054 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1055 | if (consumer_data->cmd_sock < 0) { | |
1056 | sem_post(&consumer_data->sem); | |
48842b30 | 1057 | PERROR("consumer connect"); |
1d4b027a DG |
1058 | goto error; |
1059 | } | |
1060 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1061 | sem_post(&consumer_data->sem); |
1062 | DBG("consumer command socket ready"); | |
1d4b027a | 1063 | } else { |
3bd1e081 | 1064 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1065 | lttcomm_get_readable_code(-code)); |
1066 | goto error; | |
1067 | } | |
1068 | ||
54d01ffb | 1069 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1070 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1071 | if (ret < 0) { |
72079cae DG |
1072 | goto error; |
1073 | } | |
1074 | ||
5eb91c98 DG |
1075 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1076 | if (ret < 0) { | |
72079cae | 1077 | goto error; |
5eb91c98 DG |
1078 | } |
1079 | ||
1080 | /* Update number of fd */ | |
1081 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1082 | ||
1083 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1084 | restart_poll: |
5eb91c98 DG |
1085 | ret = lttng_poll_wait(&events, -1); |
1086 | if (ret < 0) { | |
88f2b785 MD |
1087 | /* |
1088 | * Restart interrupted system call. | |
1089 | */ | |
1090 | if (errno == EINTR) { | |
1091 | goto restart_poll; | |
1092 | } | |
72079cae DG |
1093 | goto error; |
1094 | } | |
1095 | ||
5eb91c98 DG |
1096 | for (i = 0; i < nb_fd; i++) { |
1097 | /* Fetch once the poll data */ | |
1098 | revents = LTTNG_POLL_GETEV(&events, i); | |
1099 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1100 | ||
1101 | /* Thread quit pipe has been closed. Killing thread. */ | |
1102 | ret = check_thread_quit_pipe(pollfd, revents); | |
1103 | if (ret) { | |
1104 | goto error; | |
1105 | } | |
1106 | ||
1107 | /* Event on the kconsumerd socket */ | |
1108 | if (pollfd == sock) { | |
1109 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1110 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1111 | goto error; |
1112 | } | |
1113 | } | |
1114 | } | |
1115 | ||
712ea556 | 1116 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1117 | ret = lttcomm_recv_unix_sock(sock, &code, |
1118 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1119 | if (ret <= 0) { |
3bd1e081 | 1120 | ERR("consumer closed the command socket"); |
712ea556 | 1121 | goto error; |
6f61d021 | 1122 | } |
1d4b027a | 1123 | |
3bd1e081 | 1124 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1125 | |
1d4b027a | 1126 | error: |
f22d70f0 DG |
1127 | /* Immediately set the consumerd state to stopped */ |
1128 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1129 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1130 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1131 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1132 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1133 | } else { | |
1134 | /* Code flow error... */ | |
1135 | assert(0); | |
1136 | } | |
1137 | ||
76d7553f MD |
1138 | if (consumer_data->err_sock >= 0) { |
1139 | ret = close(consumer_data->err_sock); | |
1140 | if (ret) { | |
1141 | PERROR("close"); | |
1142 | } | |
1143 | } | |
1144 | if (consumer_data->cmd_sock >= 0) { | |
1145 | ret = close(consumer_data->cmd_sock); | |
1146 | if (ret) { | |
1147 | PERROR("close"); | |
1148 | } | |
1149 | } | |
1150 | if (sock >= 0) { | |
1151 | ret = close(sock); | |
1152 | if (ret) { | |
1153 | PERROR("close"); | |
1154 | } | |
1155 | } | |
273ea72c | 1156 | |
3bd1e081 MD |
1157 | unlink(consumer_data->err_unix_sock_path); |
1158 | unlink(consumer_data->cmd_unix_sock_path); | |
1159 | consumer_data->pid = 0; | |
1d4b027a | 1160 | |
5eb91c98 | 1161 | lttng_poll_clean(&events); |
76d7553f MD |
1162 | error_poll: |
1163 | error_listen: | |
1164 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1165 | |
5eb91c98 | 1166 | return NULL; |
099e26bd DG |
1167 | } |
1168 | ||
099e26bd DG |
1169 | /* |
1170 | * This thread manage application communication. | |
1d4b027a DG |
1171 | */ |
1172 | static void *thread_manage_apps(void *data) | |
099e26bd | 1173 | { |
5eb91c98 DG |
1174 | int i, ret, pollfd; |
1175 | uint32_t revents, nb_fd; | |
099e26bd | 1176 | struct ust_command ust_cmd; |
5eb91c98 | 1177 | struct lttng_poll_event events; |
099e26bd DG |
1178 | |
1179 | DBG("[thread] Manage application started"); | |
1180 | ||
f6a9efaa DG |
1181 | rcu_register_thread(); |
1182 | rcu_thread_online(); | |
1183 | ||
5eb91c98 DG |
1184 | ret = create_thread_poll_set(&events, 2); |
1185 | if (ret < 0) { | |
76d7553f | 1186 | goto error_poll_create; |
5eb91c98 | 1187 | } |
099e26bd | 1188 | |
5eb91c98 DG |
1189 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1190 | if (ret < 0) { | |
1191 | goto error; | |
1192 | } | |
099e26bd | 1193 | |
5eb91c98 DG |
1194 | while (1) { |
1195 | /* Zeroed the events structure */ | |
1196 | lttng_poll_reset(&events); | |
0177d773 | 1197 | |
5eb91c98 | 1198 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1199 | |
1200 | DBG("Apps thread polling on %d fds", nb_fd); | |
1201 | ||
1202 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1203 | restart: |
5eb91c98 | 1204 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1205 | if (ret < 0) { |
88f2b785 MD |
1206 | /* |
1207 | * Restart interrupted system call. | |
1208 | */ | |
1209 | if (errno == EINTR) { | |
1210 | goto restart; | |
1211 | } | |
099e26bd DG |
1212 | goto error; |
1213 | } | |
1214 | ||
5eb91c98 DG |
1215 | for (i = 0; i < nb_fd; i++) { |
1216 | /* Fetch once the poll data */ | |
1217 | revents = LTTNG_POLL_GETEV(&events, i); | |
1218 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1219 | ||
1220 | /* Thread quit pipe has been closed. Killing thread. */ | |
1221 | ret = check_thread_quit_pipe(pollfd, revents); | |
1222 | if (ret) { | |
099e26bd | 1223 | goto error; |
5eb91c98 | 1224 | } |
099e26bd | 1225 | |
5eb91c98 DG |
1226 | /* Inspect the apps cmd pipe */ |
1227 | if (pollfd == apps_cmd_pipe[0]) { | |
1228 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1229 | ERR("Apps command pipe error"); | |
0177d773 | 1230 | goto error; |
5eb91c98 DG |
1231 | } else if (revents & LPOLLIN) { |
1232 | /* Empty pipe */ | |
1233 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1234 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1235 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1236 | goto error; |
1237 | } | |
099e26bd | 1238 | |
5eb91c98 | 1239 | /* Register applicaton to the session daemon */ |
56fff090 | 1240 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1241 | ust_cmd.sock); |
88ff5b7f | 1242 | if (ret == -ENOMEM) { |
5eb91c98 | 1243 | goto error; |
88ff5b7f MD |
1244 | } else if (ret < 0) { |
1245 | break; | |
5eb91c98 DG |
1246 | } |
1247 | ||
acc7b41b | 1248 | /* |
e0c7ec2b | 1249 | * Validate UST version compatibility. |
acc7b41b | 1250 | */ |
e0c7ec2b DG |
1251 | ret = ust_app_validate_version(ust_cmd.sock); |
1252 | if (ret >= 0) { | |
1253 | /* | |
1254 | * Add channel(s) and event(s) to newly registered apps | |
1255 | * from lttng global UST domain. | |
1256 | */ | |
1257 | update_ust_app(ust_cmd.sock); | |
1258 | } | |
acc7b41b | 1259 | |
f2ca2e25 | 1260 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1261 | if (ret < 0) { |
1262 | /* | |
1263 | * If the registration is not possible, we simply | |
1264 | * unregister the apps and continue | |
1265 | */ | |
56fff090 | 1266 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1267 | } else { |
1268 | /* | |
1269 | * We just need here to monitor the close of the UST | |
1270 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1271 | * Listen on POLLIN (even if we never expect any |
1272 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1273 | */ |
a9ade966 | 1274 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1275 | if (ret < 0) { |
1276 | goto error; | |
1277 | } | |
1278 | ||
54d01ffb DG |
1279 | DBG("Apps with sock %d added to poll set", |
1280 | ust_cmd.sock); | |
5eb91c98 | 1281 | } |
487cf67c | 1282 | |
5eb91c98 | 1283 | break; |
0177d773 | 1284 | } |
5eb91c98 DG |
1285 | } else { |
1286 | /* | |
54d01ffb DG |
1287 | * At this point, we know that a registered application made |
1288 | * the event at poll_wait. | |
5eb91c98 | 1289 | */ |
099e26bd | 1290 | |
268ec049 CB |
1291 | if (revents & (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1292 | ssize_t readlen; | |
1293 | char dummy; | |
1294 | ||
1295 | do { | |
bcccc1bf | 1296 | readlen = recv(pollfd, &dummy, 1, MSG_PEEK); |
268ec049 CB |
1297 | } while (readlen == -1 && errno == EINTR); |
1298 | ||
bcccc1bf | 1299 | /* Peer has performed an orderly shutdown */ |
268ec049 CB |
1300 | if (readlen == 0) { |
1301 | /* Removing from the poll set */ | |
1302 | ret = lttng_poll_del(&events, pollfd); | |
1303 | if (ret < 0) { | |
1304 | goto error; | |
1305 | } | |
1306 | ||
1307 | /* Socket closed on remote end. */ | |
1308 | ust_app_unregister(pollfd); | |
1309 | break; | |
1310 | ||
1311 | } | |
5eb91c98 | 1312 | } |
099e26bd DG |
1313 | } |
1314 | } | |
099e26bd DG |
1315 | } |
1316 | ||
1317 | error: | |
5eb91c98 | 1318 | lttng_poll_clean(&events); |
76d7553f MD |
1319 | error_poll_create: |
1320 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1321 | rcu_thread_offline(); |
1322 | rcu_unregister_thread(); | |
099e26bd DG |
1323 | return NULL; |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * Dispatch request from the registration threads to the application | |
1328 | * communication thread. | |
1329 | */ | |
1330 | static void *thread_dispatch_ust_registration(void *data) | |
1331 | { | |
1332 | int ret; | |
1333 | struct cds_wfq_node *node; | |
1334 | struct ust_command *ust_cmd = NULL; | |
1335 | ||
1336 | DBG("[thread] Dispatch UST command started"); | |
1337 | ||
1338 | while (!dispatch_thread_exit) { | |
1339 | /* Atomically prepare the queue futex */ | |
1340 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1341 | ||
1342 | do { | |
1343 | /* Dequeue command for registration */ | |
1344 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1345 | if (node == NULL) { | |
00a17c97 | 1346 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1347 | /* Continue thread execution */ |
1348 | break; | |
1349 | } | |
1350 | ||
1351 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1352 | ||
2f50c8a3 DG |
1353 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1354 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1355 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1356 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1357 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1358 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1359 | /* |
1360 | * Inform apps thread of the new application registration. This | |
1361 | * call is blocking so we can be assured that the data will be read | |
1362 | * at some point in time or wait to the end of the world :) | |
1363 | */ | |
1364 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1365 | sizeof(struct ust_command)); | |
1366 | if (ret < 0) { | |
76d7553f | 1367 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1368 | if (errno == EBADF) { |
1369 | /* | |
1370 | * We can't inform the application thread to process | |
1371 | * registration. We will exit or else application | |
1372 | * registration will not occur and tracing will never | |
1373 | * start. | |
1374 | */ | |
1375 | goto error; | |
1376 | } | |
1377 | } | |
1378 | free(ust_cmd); | |
1379 | } while (node != NULL); | |
1380 | ||
1381 | /* Futex wait on queue. Blocking call on futex() */ | |
1382 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1383 | } | |
1384 | ||
1385 | error: | |
1386 | DBG("Dispatch thread dying"); | |
1387 | return NULL; | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * This thread manage application registration. | |
1392 | */ | |
1393 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1394 | { |
a4b35e07 | 1395 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1396 | uint32_t revents, nb_fd; |
1397 | struct lttng_poll_event events; | |
099e26bd DG |
1398 | /* |
1399 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1400 | * freed in the manage apps thread. | |
1401 | */ | |
1402 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1403 | |
099e26bd | 1404 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1405 | |
1406 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1407 | if (ret < 0) { | |
76d7553f | 1408 | goto error_listen; |
1d4b027a DG |
1409 | } |
1410 | ||
5eb91c98 DG |
1411 | /* |
1412 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1413 | * more will be added to this poll set. | |
1414 | */ | |
1415 | ret = create_thread_poll_set(&events, 2); | |
1416 | if (ret < 0) { | |
76d7553f | 1417 | goto error_create_poll; |
5eb91c98 | 1418 | } |
273ea72c | 1419 | |
5eb91c98 DG |
1420 | /* Add the application registration socket */ |
1421 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1422 | if (ret < 0) { | |
76d7553f | 1423 | goto error_poll_add; |
5eb91c98 | 1424 | } |
273ea72c | 1425 | |
1d4b027a | 1426 | /* Notify all applications to register */ |
0fdd1e2c DG |
1427 | ret = notify_ust_apps(1); |
1428 | if (ret < 0) { | |
1429 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1430 | "Execution continues but there might be problem for already\n" |
1431 | "running applications that wishes to register."); | |
0fdd1e2c | 1432 | } |
1d4b027a DG |
1433 | |
1434 | while (1) { | |
1435 | DBG("Accepting application registration"); | |
273ea72c | 1436 | |
5eb91c98 DG |
1437 | nb_fd = LTTNG_POLL_GETNB(&events); |
1438 | ||
273ea72c | 1439 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1440 | restart: |
5eb91c98 | 1441 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1442 | if (ret < 0) { |
88f2b785 MD |
1443 | /* |
1444 | * Restart interrupted system call. | |
1445 | */ | |
1446 | if (errno == EINTR) { | |
1447 | goto restart; | |
1448 | } | |
273ea72c DG |
1449 | goto error; |
1450 | } | |
1451 | ||
5eb91c98 DG |
1452 | for (i = 0; i < nb_fd; i++) { |
1453 | /* Fetch once the poll data */ | |
1454 | revents = LTTNG_POLL_GETEV(&events, i); | |
1455 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1456 | |
5eb91c98 DG |
1457 | /* Thread quit pipe has been closed. Killing thread. */ |
1458 | ret = check_thread_quit_pipe(pollfd, revents); | |
1459 | if (ret) { | |
90014c57 DG |
1460 | goto error; |
1461 | } | |
1d4b027a | 1462 | |
5eb91c98 DG |
1463 | /* Event on the registration socket */ |
1464 | if (pollfd == apps_sock) { | |
1465 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1466 | ERR("Register apps socket poll error"); | |
1467 | goto error; | |
1468 | } else if (revents & LPOLLIN) { | |
1469 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1470 | if (sock < 0) { | |
1471 | goto error; | |
1472 | } | |
099e26bd | 1473 | |
5eb91c98 | 1474 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1475 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1476 | if (ust_cmd == NULL) { |
76d7553f | 1477 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1478 | goto error; |
1479 | } | |
1d4b027a | 1480 | |
5eb91c98 DG |
1481 | /* |
1482 | * Using message-based transmissions to ensure we don't | |
1483 | * have to deal with partially received messages. | |
1484 | */ | |
4063050c MD |
1485 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1486 | if (ret < 0) { | |
1487 | ERR("Exhausted file descriptors allowed for applications."); | |
1488 | free(ust_cmd); | |
1489 | ret = close(sock); | |
1490 | if (ret) { | |
1491 | PERROR("close"); | |
1492 | } | |
1493 | sock = -1; | |
1494 | continue; | |
1495 | } | |
5eb91c98 DG |
1496 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1497 | sizeof(struct ust_register_msg)); | |
1498 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1499 | if (ret < 0) { | |
76d7553f | 1500 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1501 | } else { |
1502 | ERR("Wrong size received on apps register"); | |
1503 | } | |
1504 | free(ust_cmd); | |
76d7553f MD |
1505 | ret = close(sock); |
1506 | if (ret) { | |
1507 | PERROR("close"); | |
1508 | } | |
4063050c | 1509 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1510 | sock = -1; |
5eb91c98 DG |
1511 | continue; |
1512 | } | |
099e26bd | 1513 | |
5eb91c98 | 1514 | ust_cmd->sock = sock; |
34a2494f | 1515 | sock = -1; |
099e26bd | 1516 | |
5eb91c98 DG |
1517 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1518 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1519 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1520 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1521 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1522 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1523 | |
5eb91c98 DG |
1524 | /* |
1525 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1526 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1527 | */ |
1528 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1529 | ||
1530 | /* | |
1531 | * Wake the registration queue futex. Implicit memory | |
1532 | * barrier with the exchange in cds_wfq_enqueue. | |
1533 | */ | |
1534 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1535 | } | |
1536 | } | |
90014c57 | 1537 | } |
1d4b027a DG |
1538 | } |
1539 | ||
1540 | error: | |
0fdd1e2c DG |
1541 | /* Notify that the registration thread is gone */ |
1542 | notify_ust_apps(0); | |
1543 | ||
a4b35e07 | 1544 | if (apps_sock >= 0) { |
76d7553f MD |
1545 | ret = close(apps_sock); |
1546 | if (ret) { | |
1547 | PERROR("close"); | |
1548 | } | |
a4b35e07 | 1549 | } |
46c3f085 | 1550 | if (sock >= 0) { |
76d7553f MD |
1551 | ret = close(sock); |
1552 | if (ret) { | |
1553 | PERROR("close"); | |
1554 | } | |
4063050c | 1555 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1556 | } |
273ea72c | 1557 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1558 | |
76d7553f | 1559 | error_poll_add: |
5eb91c98 | 1560 | lttng_poll_clean(&events); |
76d7553f MD |
1561 | error_listen: |
1562 | error_create_poll: | |
1563 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1564 | |
1d4b027a DG |
1565 | return NULL; |
1566 | } | |
1567 | ||
8c0faa1d | 1568 | /* |
3bd1e081 | 1569 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1570 | * exec or it will fails. |
8c0faa1d | 1571 | */ |
3bd1e081 | 1572 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1573 | { |
1574 | int ret; | |
ee0b0061 DG |
1575 | struct timespec timeout; |
1576 | ||
1577 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1578 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1579 | |
1580 | /* Setup semaphore */ | |
3bd1e081 | 1581 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1582 | if (ret < 0) { |
3bd1e081 | 1583 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1584 | goto error; |
1585 | } | |
8c0faa1d | 1586 | |
3bd1e081 MD |
1587 | ret = pthread_create(&consumer_data->thread, NULL, |
1588 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1589 | if (ret != 0) { |
3bd1e081 | 1590 | PERROR("pthread_create consumer"); |
ee0b0061 | 1591 | ret = -1; |
8c0faa1d DG |
1592 | goto error; |
1593 | } | |
1594 | ||
ee0b0061 DG |
1595 | /* Get time for sem_timedwait absolute timeout */ |
1596 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1597 | if (ret < 0) { | |
3bd1e081 | 1598 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1599 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1600 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1601 | } else { |
1602 | /* Normal timeout if the gettime was successful */ | |
1603 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1604 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1605 | } |
8c0faa1d | 1606 | |
ee0b0061 DG |
1607 | if (ret < 0) { |
1608 | if (errno == ETIMEDOUT) { | |
1609 | /* | |
1610 | * Call has timed out so we kill the kconsumerd_thread and return | |
1611 | * an error. | |
1612 | */ | |
3bd1e081 MD |
1613 | ERR("The consumer thread was never ready. Killing it"); |
1614 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1615 | if (ret < 0) { |
3bd1e081 | 1616 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1617 | } |
1618 | } else { | |
3bd1e081 | 1619 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1620 | } |
1621 | goto error; | |
1622 | } | |
1623 | ||
3bd1e081 MD |
1624 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1625 | if (consumer_data->pid == 0) { | |
712ea556 | 1626 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1627 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1628 | goto error; |
1629 | } | |
3bd1e081 | 1630 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1631 | |
8c0faa1d DG |
1632 | return 0; |
1633 | ||
1634 | error: | |
1635 | return ret; | |
1636 | } | |
1637 | ||
d9800920 | 1638 | /* |
3bd1e081 | 1639 | * Join consumer thread |
d9800920 | 1640 | */ |
3bd1e081 | 1641 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1642 | { |
1643 | void *status; | |
1644 | int ret; | |
1645 | ||
3bd1e081 MD |
1646 | if (consumer_data->pid != 0) { |
1647 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1648 | if (ret) { |
3bd1e081 | 1649 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1650 | return ret; |
1651 | } | |
3bd1e081 | 1652 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1653 | } else { |
1654 | return 0; | |
1655 | } | |
1656 | } | |
1657 | ||
8c0faa1d | 1658 | /* |
3bd1e081 | 1659 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1660 | * |
d063d709 | 1661 | * Return pid if successful else -1. |
8c0faa1d | 1662 | */ |
3bd1e081 | 1663 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1664 | { |
1665 | int ret; | |
1666 | pid_t pid; | |
94c55f17 | 1667 | const char *consumer_to_use; |
53086306 | 1668 | const char *verbosity; |
94c55f17 | 1669 | struct stat st; |
8c0faa1d | 1670 | |
3bd1e081 | 1671 | DBG("Spawning consumerd"); |
c49dc785 | 1672 | |
8c0faa1d DG |
1673 | pid = fork(); |
1674 | if (pid == 0) { | |
1675 | /* | |
3bd1e081 | 1676 | * Exec consumerd. |
8c0faa1d | 1677 | */ |
daee5345 | 1678 | if (opt_verbose_consumer) { |
53086306 DG |
1679 | verbosity = "--verbose"; |
1680 | } else { | |
1681 | verbosity = "--quiet"; | |
1682 | } | |
3bd1e081 MD |
1683 | switch (consumer_data->type) { |
1684 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1685 | /* |
c7704d57 DG |
1686 | * Find out which consumerd to execute. We will first try the |
1687 | * 64-bit path, then the sessiond's installation directory, and | |
1688 | * fallback on the 32-bit one, | |
94c55f17 | 1689 | */ |
63a799e8 AM |
1690 | DBG3("Looking for a kernel consumer at these locations:"); |
1691 | DBG3(" 1) %s", consumerd64_bin); | |
1692 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1693 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1694 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1695 | DBG3("Found location #1"); |
94c55f17 | 1696 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1697 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1698 | DBG3("Found location #2"); |
94c55f17 | 1699 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1700 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1701 | DBG3("Found location #3"); |
eb1e0bd4 | 1702 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1703 | } else { |
63a799e8 | 1704 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1705 | break; |
1706 | } | |
1707 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1708 | execl(consumer_to_use, | |
1709 | "lttng-consumerd", verbosity, "-k", | |
1710 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1711 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1712 | NULL); | |
3bd1e081 | 1713 | break; |
7753dea8 MD |
1714 | case LTTNG_CONSUMER64_UST: |
1715 | { | |
b1e0b6b6 | 1716 | char *tmpnew = NULL; |
8f4905da MD |
1717 | |
1718 | if (consumerd64_libdir[0] != '\0') { | |
1719 | char *tmp; | |
1720 | size_t tmplen; | |
1721 | ||
1722 | tmp = getenv("LD_LIBRARY_PATH"); | |
1723 | if (!tmp) { | |
1724 | tmp = ""; | |
1725 | } | |
1726 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1727 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1728 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1729 | if (!tmpnew) { | |
1730 | ret = -ENOMEM; | |
1731 | goto error; | |
1732 | } | |
1733 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1734 | strcat(tmpnew, consumerd64_libdir); | |
1735 | if (tmp[0] != '\0') { | |
1736 | strcat(tmpnew, ":"); | |
1737 | strcat(tmpnew, tmp); | |
1738 | } | |
1739 | ret = putenv(tmpnew); | |
1740 | if (ret) { | |
1741 | ret = -errno; | |
1742 | goto error; | |
1743 | } | |
1744 | } | |
94c55f17 | 1745 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1746 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1747 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1748 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1749 | NULL); | |
8f4905da MD |
1750 | if (consumerd64_libdir[0] != '\0') { |
1751 | free(tmpnew); | |
1752 | } | |
1753 | if (ret) { | |
1754 | goto error; | |
1755 | } | |
3bd1e081 | 1756 | break; |
7753dea8 MD |
1757 | } |
1758 | case LTTNG_CONSUMER32_UST: | |
1759 | { | |
937dde8e | 1760 | char *tmpnew = NULL; |
8f4905da MD |
1761 | |
1762 | if (consumerd32_libdir[0] != '\0') { | |
1763 | char *tmp; | |
1764 | size_t tmplen; | |
1765 | ||
1766 | tmp = getenv("LD_LIBRARY_PATH"); | |
1767 | if (!tmp) { | |
1768 | tmp = ""; | |
1769 | } | |
1770 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1771 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1772 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1773 | if (!tmpnew) { | |
1774 | ret = -ENOMEM; | |
1775 | goto error; | |
1776 | } | |
1777 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1778 | strcat(tmpnew, consumerd32_libdir); | |
1779 | if (tmp[0] != '\0') { | |
1780 | strcat(tmpnew, ":"); | |
1781 | strcat(tmpnew, tmp); | |
1782 | } | |
1783 | ret = putenv(tmpnew); | |
1784 | if (ret) { | |
1785 | ret = -errno; | |
1786 | goto error; | |
1787 | } | |
1788 | } | |
94c55f17 | 1789 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1790 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1791 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1792 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1793 | NULL); | |
8f4905da MD |
1794 | if (consumerd32_libdir[0] != '\0') { |
1795 | free(tmpnew); | |
1796 | } | |
1797 | if (ret) { | |
1798 | goto error; | |
1799 | } | |
7753dea8 MD |
1800 | break; |
1801 | } | |
3bd1e081 | 1802 | default: |
76d7553f | 1803 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1804 | exit(EXIT_FAILURE); |
1805 | } | |
8c0faa1d | 1806 | if (errno != 0) { |
76d7553f | 1807 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1808 | } |
1809 | exit(EXIT_FAILURE); | |
1810 | } else if (pid > 0) { | |
1811 | ret = pid; | |
8c0faa1d | 1812 | } else { |
76d7553f | 1813 | PERROR("start consumer fork"); |
8c0faa1d | 1814 | ret = -errno; |
8c0faa1d | 1815 | } |
8f4905da | 1816 | error: |
8c0faa1d DG |
1817 | return ret; |
1818 | } | |
1819 | ||
693bd40b | 1820 | /* |
3bd1e081 | 1821 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1822 | */ |
3bd1e081 | 1823 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1824 | { |
1825 | int ret; | |
1826 | ||
3bd1e081 MD |
1827 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1828 | if (consumer_data->pid != 0) { | |
1829 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1830 | goto end; |
1831 | } | |
693bd40b | 1832 | |
3bd1e081 | 1833 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1834 | if (ret < 0) { |
3bd1e081 MD |
1835 | ERR("Spawning consumerd failed"); |
1836 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1837 | goto error; |
693bd40b | 1838 | } |
c49dc785 | 1839 | |
3bd1e081 MD |
1840 | /* Setting up the consumer_data pid */ |
1841 | consumer_data->pid = ret; | |
48842b30 | 1842 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1843 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1844 | |
3bd1e081 MD |
1845 | DBG2("Spawning consumer control thread"); |
1846 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1847 | if (ret < 0) { |
3bd1e081 | 1848 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1849 | goto error; |
1850 | } | |
1851 | ||
c49dc785 | 1852 | end: |
693bd40b DG |
1853 | return 0; |
1854 | ||
1855 | error: | |
1856 | return ret; | |
1857 | } | |
1858 | ||
b73401da | 1859 | /* |
096102bd | 1860 | * Check version of the lttng-modules. |
b73401da | 1861 | */ |
096102bd | 1862 | static int validate_lttng_modules_version(void) |
b73401da | 1863 | { |
096102bd | 1864 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1865 | } |
1866 | ||
b73401da | 1867 | /* |
096102bd | 1868 | * Setup necessary data for kernel tracer action. |
b73401da | 1869 | */ |
096102bd | 1870 | static int init_kernel_tracer(void) |
b73401da DG |
1871 | { |
1872 | int ret; | |
b73401da | 1873 | |
096102bd DG |
1874 | /* Modprobe lttng kernel modules */ |
1875 | ret = modprobe_lttng_control(); | |
b73401da | 1876 | if (ret < 0) { |
b73401da DG |
1877 | goto error; |
1878 | } | |
1879 | ||
096102bd DG |
1880 | /* Open debugfs lttng */ |
1881 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1882 | if (kernel_tracer_fd < 0) { | |
1883 | DBG("Failed to open %s", module_proc_lttng); | |
1884 | ret = -1; | |
1885 | goto error_open; | |
b73401da DG |
1886 | } |
1887 | ||
096102bd DG |
1888 | /* Validate kernel version */ |
1889 | ret = validate_lttng_modules_version(); | |
b73401da | 1890 | if (ret < 0) { |
096102bd | 1891 | goto error_version; |
b73401da DG |
1892 | } |
1893 | ||
096102bd | 1894 | ret = modprobe_lttng_data(); |
b73401da | 1895 | if (ret < 0) { |
096102bd | 1896 | goto error_modules; |
8c0faa1d DG |
1897 | } |
1898 | ||
f3ed775e | 1899 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1900 | return 0; |
1901 | ||
1902 | error_version: | |
1903 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1904 | ret = close(kernel_tracer_fd); |
1905 | if (ret) { | |
1906 | PERROR("close"); | |
1907 | } | |
1908 | kernel_tracer_fd = -1; | |
096102bd DG |
1909 | return LTTCOMM_KERN_VERSION; |
1910 | ||
1911 | error_modules: | |
76d7553f MD |
1912 | ret = close(kernel_tracer_fd); |
1913 | if (ret) { | |
1914 | PERROR("close"); | |
1915 | } | |
096102bd DG |
1916 | |
1917 | error_open: | |
1918 | modprobe_remove_lttng_control(); | |
b73401da DG |
1919 | |
1920 | error: | |
b73401da | 1921 | WARN("No kernel tracer available"); |
a4b35e07 | 1922 | kernel_tracer_fd = -1; |
531d29f9 MD |
1923 | if (!is_root) { |
1924 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1925 | } else { | |
1926 | return LTTCOMM_KERN_NA; | |
1927 | } | |
f3ed775e | 1928 | } |
33a2b854 | 1929 | |
f3ed775e | 1930 | /* |
54d01ffb | 1931 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1932 | */ |
54d01ffb | 1933 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1934 | { |
f40799e8 | 1935 | int ret = 0; |
8c0faa1d | 1936 | |
3bd1e081 | 1937 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1938 | /* |
54d01ffb | 1939 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1940 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1941 | * an extra security check. |
d9800920 | 1942 | */ |
03550b58 | 1943 | if (session->consumer_fd < 0) { |
3bd1e081 | 1944 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1945 | } |
1946 | ||
2bdd86d4 | 1947 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1948 | if (ret < 0) { |
f3ed775e DG |
1949 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1950 | goto error; | |
1951 | } | |
1d4b027a | 1952 | |
3bd1e081 | 1953 | session->consumer_fds_sent = 1; |
f3ed775e | 1954 | } |
1d4b027a DG |
1955 | |
1956 | error: | |
1957 | return ret; | |
8c0faa1d DG |
1958 | } |
1959 | ||
0177d773 DG |
1960 | /* |
1961 | * Create an UST session and add it to the session ust list. | |
1962 | */ | |
44d3bd01 | 1963 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1964 | struct lttng_domain *domain) |
0177d773 | 1965 | { |
13384287 | 1966 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1967 | int ret; |
44d3bd01 DG |
1968 | |
1969 | switch (domain->type) { | |
48842b30 | 1970 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1971 | break; |
1972 | default: | |
13384287 | 1973 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1974 | goto error; |
1975 | } | |
0177d773 DG |
1976 | |
1977 | DBG("Creating UST session"); | |
1978 | ||
a991f516 | 1979 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1980 | if (lus == NULL) { |
44d3bd01 | 1981 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1982 | goto error; |
1983 | } | |
1984 | ||
e11d277b | 1985 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1986 | session->uid, session->gid); |
0177d773 DG |
1987 | if (ret < 0) { |
1988 | if (ret != -EEXIST) { | |
1989 | ERR("Trace directory creation error"); | |
44d3bd01 | 1990 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1991 | goto error; |
1992 | } | |
1993 | } | |
1994 | ||
f6a9efaa DG |
1995 | /* The domain type dictate different actions on session creation */ |
1996 | switch (domain->type) { | |
48842b30 DG |
1997 | case LTTNG_DOMAIN_UST: |
1998 | /* No ustctl for the global UST domain */ | |
1999 | break; | |
2000 | default: | |
36dc12cc | 2001 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 2002 | goto error; |
0177d773 | 2003 | } |
6df2e2c9 MD |
2004 | lus->uid = session->uid; |
2005 | lus->gid = session->gid; | |
f6a9efaa | 2006 | session->ust_session = lus; |
44d3bd01 DG |
2007 | |
2008 | return LTTCOMM_OK; | |
0177d773 DG |
2009 | |
2010 | error: | |
2011 | free(lus); | |
2012 | return ret; | |
2013 | } | |
2014 | ||
333f285e | 2015 | /* |
d063d709 | 2016 | * Create a kernel tracer session then create the default channel. |
333f285e | 2017 | */ |
6df2e2c9 | 2018 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2019 | { |
f3ed775e | 2020 | int ret; |
f3ed775e DG |
2021 | |
2022 | DBG("Creating kernel session"); | |
2023 | ||
2024 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2025 | if (ret < 0) { | |
2026 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2027 | goto error; | |
333f285e DG |
2028 | } |
2029 | ||
d9800920 | 2030 | /* Set kernel consumer socket fd */ |
03550b58 | 2031 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 2032 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
2033 | } |
2034 | ||
e11d277b | 2035 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 2036 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2037 | if (ret < 0) { |
996b65c8 | 2038 | if (ret != -EEXIST) { |
7a485870 DG |
2039 | ERR("Trace directory creation error"); |
2040 | goto error; | |
2041 | } | |
2042 | } | |
6df2e2c9 MD |
2043 | session->kernel_session->uid = session->uid; |
2044 | session->kernel_session->gid = session->gid; | |
7a485870 | 2045 | |
f3ed775e DG |
2046 | error: |
2047 | return ret; | |
333f285e DG |
2048 | } |
2049 | ||
8e0af1b4 | 2050 | /* |
c7704d57 DG |
2051 | * Check if the UID or GID match the session. Root user has access to all |
2052 | * sessions. | |
8e0af1b4 | 2053 | */ |
c7704d57 | 2054 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 2055 | { |
c7704d57 | 2056 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2057 | return 0; |
2058 | } else { | |
2059 | return 1; | |
2060 | } | |
2061 | } | |
2062 | ||
2063 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2064 | { | |
2065 | unsigned int i = 0; | |
2066 | struct ltt_session *session; | |
2067 | ||
2068 | DBG("Counting number of available session for UID %d GID %d", | |
2069 | uid, gid); | |
2070 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2071 | /* | |
2072 | * Only list the sessions the user can control. | |
2073 | */ | |
2074 | if (!session_access_ok(session, uid, gid)) { | |
2075 | continue; | |
2076 | } | |
2077 | i++; | |
2078 | } | |
2079 | return i; | |
2080 | } | |
2081 | ||
6c9cc2ab DG |
2082 | /* |
2083 | * Using the session list, filled a lttng_session array to send back to the | |
2084 | * client for session listing. | |
2085 | * | |
2086 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2087 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2088 | */ |
c7704d57 DG |
2089 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2090 | gid_t gid) | |
6c9cc2ab | 2091 | { |
8e0af1b4 | 2092 | unsigned int i = 0; |
6c9cc2ab DG |
2093 | struct ltt_session *session; |
2094 | ||
8e0af1b4 MD |
2095 | DBG("Getting all available session for UID %d GID %d", |
2096 | uid, gid); | |
6c9cc2ab DG |
2097 | /* |
2098 | * Iterate over session list and append data after the control struct in | |
2099 | * the buffer. | |
2100 | */ | |
2101 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2102 | /* |
2103 | * Only list the sessions the user can control. | |
2104 | */ | |
2105 | if (!session_access_ok(session, uid, gid)) { | |
2106 | continue; | |
2107 | } | |
6c9cc2ab | 2108 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2109 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2110 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2111 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2112 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2113 | i++; |
2114 | } | |
2115 | } | |
2116 | ||
9f19cc17 DG |
2117 | /* |
2118 | * Fill lttng_channel array of all channels. | |
2119 | */ | |
b551a063 | 2120 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2121 | struct lttng_channel *channels) |
2122 | { | |
2123 | int i = 0; | |
2124 | struct ltt_kernel_channel *kchan; | |
2125 | ||
2126 | DBG("Listing channels for session %s", session->name); | |
2127 | ||
b551a063 DG |
2128 | switch (domain) { |
2129 | case LTTNG_DOMAIN_KERNEL: | |
2130 | /* Kernel channels */ | |
2131 | if (session->kernel_session != NULL) { | |
2132 | cds_list_for_each_entry(kchan, | |
2133 | &session->kernel_session->channel_list.head, list) { | |
2134 | /* Copy lttng_channel struct to array */ | |
2135 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2136 | channels[i].enabled = kchan->enabled; | |
2137 | i++; | |
2138 | } | |
2139 | } | |
2140 | break; | |
2141 | case LTTNG_DOMAIN_UST: | |
2142 | { | |
bec39940 | 2143 | struct lttng_ht_iter iter; |
b551a063 DG |
2144 | struct ltt_ust_channel *uchan; |
2145 | ||
bec39940 DG |
2146 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2147 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2148 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2149 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2150 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2151 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2152 | channels[i].attr.switch_timer_interval = | |
2153 | uchan->attr.switch_timer_interval; | |
2154 | channels[i].attr.read_timer_interval = | |
2155 | uchan->attr.read_timer_interval; | |
aea829b3 | 2156 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2157 | switch (uchan->attr.output) { |
2158 | case LTTNG_UST_MMAP: | |
2159 | default: | |
2160 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2161 | break; | |
2162 | } | |
befe0905 | 2163 | i++; |
b551a063 DG |
2164 | } |
2165 | break; | |
2166 | } | |
2167 | default: | |
2168 | break; | |
2169 | } | |
2170 | } | |
2171 | ||
2172 | /* | |
2173 | * Create a list of ust global domain events. | |
2174 | */ | |
2175 | static int list_lttng_ust_global_events(char *channel_name, | |
2176 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2177 | { | |
2178 | int i = 0, ret = 0; | |
2179 | unsigned int nb_event = 0; | |
bec39940 DG |
2180 | struct lttng_ht_iter iter; |
2181 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2182 | struct ltt_ust_channel *uchan; |
2183 | struct ltt_ust_event *uevent; | |
2184 | struct lttng_event *tmp; | |
2185 | ||
2186 | DBG("Listing UST global events for channel %s", channel_name); | |
2187 | ||
2188 | rcu_read_lock(); | |
2189 | ||
bec39940 DG |
2190 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2191 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2192 | if (node == NULL) { |
2193 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2194 | goto error; | |
b551a063 DG |
2195 | } |
2196 | ||
bec39940 | 2197 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2198 | |
bec39940 | 2199 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2200 | |
b551a063 DG |
2201 | if (nb_event == 0) { |
2202 | ret = nb_event; | |
2203 | goto error; | |
2204 | } | |
2205 | ||
2206 | DBG3("Listing UST global %d events", nb_event); | |
2207 | ||
2208 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2209 | if (tmp == NULL) { | |
2210 | ret = -LTTCOMM_FATAL; | |
2211 | goto error; | |
2212 | } | |
2213 | ||
bec39940 | 2214 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2215 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2216 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2217 | tmp[i].enabled = uevent->enabled; | |
2218 | switch (uevent->attr.instrumentation) { | |
2219 | case LTTNG_UST_TRACEPOINT: | |
2220 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2221 | break; | |
2222 | case LTTNG_UST_PROBE: | |
2223 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2224 | break; | |
2225 | case LTTNG_UST_FUNCTION: | |
2226 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2227 | break; | |
0cda4f28 | 2228 | } |
8005f29a | 2229 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2230 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2231 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2232 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2233 | break; |
8005f29a | 2234 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2235 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2236 | break; |
2237 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2238 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2239 | break; |
9f19cc17 | 2240 | } |
d7b75b30 | 2241 | i++; |
9f19cc17 DG |
2242 | } |
2243 | ||
b551a063 DG |
2244 | ret = nb_event; |
2245 | *events = tmp; | |
2246 | ||
2247 | error: | |
2248 | rcu_read_unlock(); | |
2249 | return ret; | |
9f19cc17 DG |
2250 | } |
2251 | ||
2252 | /* | |
b551a063 | 2253 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2254 | */ |
b551a063 DG |
2255 | static int list_lttng_kernel_events(char *channel_name, |
2256 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2257 | { |
b551a063 DG |
2258 | int i = 0, ret; |
2259 | unsigned int nb_event; | |
9f19cc17 | 2260 | struct ltt_kernel_event *event; |
b551a063 DG |
2261 | struct ltt_kernel_channel *kchan; |
2262 | ||
2263 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2264 | if (kchan == NULL) { | |
2265 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2266 | goto error; | |
2267 | } | |
2268 | ||
2269 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2270 | |
2271 | DBG("Listing events for channel %s", kchan->channel->name); | |
2272 | ||
b551a063 DG |
2273 | if (nb_event == 0) { |
2274 | ret = nb_event; | |
2275 | goto error; | |
2276 | } | |
2277 | ||
2278 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2279 | if (*events == NULL) { | |
2280 | ret = LTTCOMM_FATAL; | |
2281 | goto error; | |
2282 | } | |
2283 | ||
9f19cc17 DG |
2284 | /* Kernel channels */ |
2285 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2286 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2287 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2288 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2289 | switch (event->event->instrumentation) { |
2290 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2291 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2292 | break; |
2293 | case LTTNG_KERNEL_KPROBE: | |
2294 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2295 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2296 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2297 | sizeof(struct lttng_kernel_kprobe)); |
2298 | break; | |
2299 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2300 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2301 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2302 | sizeof(struct lttng_kernel_function)); |
2303 | break; | |
0133c199 | 2304 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2305 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2306 | break; |
a54bd42d | 2307 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2308 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2309 | break; |
7a3d1328 MD |
2310 | case LTTNG_KERNEL_ALL: |
2311 | assert(0); | |
2312 | break; | |
9f19cc17 DG |
2313 | } |
2314 | i++; | |
2315 | } | |
b551a063 DG |
2316 | |
2317 | return nb_event; | |
2318 | ||
2319 | error: | |
2320 | return ret; | |
9f19cc17 DG |
2321 | } |
2322 | ||
fac6795d | 2323 | /* |
54d01ffb | 2324 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2325 | */ |
54d01ffb DG |
2326 | static int cmd_disable_channel(struct ltt_session *session, |
2327 | int domain, char *channel_name) | |
fac6795d | 2328 | { |
54d01ffb | 2329 | int ret; |
78f0bacd DG |
2330 | struct ltt_ust_session *usess; |
2331 | ||
2332 | usess = session->ust_session; | |
379473d2 | 2333 | |
54d01ffb | 2334 | switch (domain) { |
78f0bacd DG |
2335 | case LTTNG_DOMAIN_KERNEL: |
2336 | { | |
2337 | ret = channel_kernel_disable(session->kernel_session, | |
2338 | channel_name); | |
2339 | if (ret != LTTCOMM_OK) { | |
2340 | goto error; | |
2341 | } | |
54d01ffb | 2342 | |
78f0bacd DG |
2343 | kernel_wait_quiescent(kernel_tracer_fd); |
2344 | break; | |
2345 | } | |
2346 | case LTTNG_DOMAIN_UST: | |
2347 | { | |
2348 | struct ltt_ust_channel *uchan; | |
bec39940 | 2349 | struct lttng_ht *chan_ht; |
78f0bacd | 2350 | |
7885e399 DG |
2351 | chan_ht = usess->domain_global.channels; |
2352 | ||
2353 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2354 | if (uchan == NULL) { |
2355 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2356 | goto error; |
78f0bacd DG |
2357 | } |
2358 | ||
7885e399 DG |
2359 | ret = channel_ust_disable(usess, domain, uchan); |
2360 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2361 | goto error; |
2362 | } | |
78f0bacd DG |
2363 | break; |
2364 | } | |
d78d6610 | 2365 | #if 0 |
78f0bacd DG |
2366 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2367 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2368 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2369 | #endif |
78f0bacd DG |
2370 | default: |
2371 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2372 | goto error; | |
20fe2104 DG |
2373 | } |
2374 | ||
54d01ffb | 2375 | ret = LTTCOMM_OK; |
d65106b1 | 2376 | |
54d01ffb DG |
2377 | error: |
2378 | return ret; | |
2379 | } | |
2380 | ||
2381 | /* | |
2382 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2383 | */ | |
44d3bd01 | 2384 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2385 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2386 | { |
2387 | int ret; | |
f6a9efaa | 2388 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2389 | struct lttng_ht *chan_ht; |
f6a9efaa | 2390 | |
5d56b5aa | 2391 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2392 | |
aea829b3 | 2393 | switch (domain) { |
44d3bd01 DG |
2394 | case LTTNG_DOMAIN_KERNEL: |
2395 | { | |
2396 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2397 | |
44d3bd01 DG |
2398 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2399 | session->kernel_session); | |
2400 | if (kchan == NULL) { | |
2401 | ret = channel_kernel_create(session->kernel_session, | |
2402 | attr, kernel_poll_pipe[1]); | |
2403 | } else { | |
2404 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2405 | } | |
2406 | ||
2407 | if (ret != LTTCOMM_OK) { | |
2408 | goto error; | |
2409 | } | |
2410 | ||
2411 | kernel_wait_quiescent(kernel_tracer_fd); | |
2412 | break; | |
2413 | } | |
f6a9efaa DG |
2414 | case LTTNG_DOMAIN_UST: |
2415 | { | |
2416 | struct ltt_ust_channel *uchan; | |
2417 | ||
7885e399 | 2418 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2419 | |
7885e399 | 2420 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2421 | if (uchan == NULL) { |
7885e399 | 2422 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2423 | } else { |
7885e399 | 2424 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2425 | } |
f6a9efaa DG |
2426 | break; |
2427 | } | |
d78d6610 | 2428 | #if 0 |
78f0bacd DG |
2429 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2430 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2431 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2432 | #endif |
44d3bd01 DG |
2433 | default: |
2434 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2435 | goto error; | |
54d01ffb DG |
2436 | } |
2437 | ||
54d01ffb DG |
2438 | error: |
2439 | return ret; | |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2444 | */ | |
2445 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2446 | char *channel_name, char *event_name) | |
2447 | { | |
2448 | int ret; | |
54d01ffb DG |
2449 | |
2450 | switch (domain) { | |
2451 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2452 | { |
2453 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2454 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2455 | |
b0a40d28 DG |
2456 | ksess = session->kernel_session; |
2457 | ||
2458 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2459 | if (kchan == NULL) { |
2460 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2461 | goto error; | |
d65106b1 DG |
2462 | } |
2463 | ||
b0a40d28 | 2464 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2465 | if (ret != LTTCOMM_OK) { |
2466 | goto error; | |
2467 | } | |
2468 | ||
2469 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2470 | break; |
2bdd86d4 MD |
2471 | } |
2472 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2473 | { |
b0a40d28 | 2474 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2475 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2476 | |
2477 | usess = session->ust_session; | |
2478 | ||
2479 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2480 | channel_name); | |
2481 | if (uchan == NULL) { | |
2482 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2483 | goto error; | |
2484 | } | |
2485 | ||
7f79d3a1 DG |
2486 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2487 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2488 | goto error; |
2489 | } | |
2490 | ||
7f79d3a1 | 2491 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2492 | channel_name); |
b0a40d28 DG |
2493 | break; |
2494 | } | |
d78d6610 | 2495 | #if 0 |
2bdd86d4 MD |
2496 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2497 | case LTTNG_DOMAIN_UST_PID: | |
2498 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2499 | #endif |
54d01ffb | 2500 | default: |
1ab1ea0b | 2501 | ret = LTTCOMM_UND; |
54d01ffb | 2502 | goto error; |
d65106b1 | 2503 | } |
26cc6b4e | 2504 | |
54d01ffb DG |
2505 | ret = LTTCOMM_OK; |
2506 | ||
2507 | error: | |
2508 | return ret; | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2513 | */ | |
2514 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2515 | char *channel_name) | |
2516 | { | |
2517 | int ret; | |
54d01ffb DG |
2518 | |
2519 | switch (domain) { | |
2520 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2521 | { |
2522 | struct ltt_kernel_session *ksess; | |
2523 | struct ltt_kernel_channel *kchan; | |
2524 | ||
2525 | ksess = session->kernel_session; | |
2526 | ||
2527 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2528 | if (kchan == NULL) { |
2529 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2530 | goto error; | |
26cc6b4e DG |
2531 | } |
2532 | ||
9730260e | 2533 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2534 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2535 | goto error; |
26cc6b4e DG |
2536 | } |
2537 | ||
54d01ffb | 2538 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2539 | break; |
9730260e DG |
2540 | } |
2541 | case LTTNG_DOMAIN_UST: | |
2542 | { | |
2543 | struct ltt_ust_session *usess; | |
2544 | struct ltt_ust_channel *uchan; | |
2545 | ||
2546 | usess = session->ust_session; | |
2547 | ||
2548 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2549 | channel_name); | |
2550 | if (uchan == NULL) { | |
2551 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2552 | goto error; | |
2553 | } | |
2554 | ||
7f79d3a1 DG |
2555 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2556 | if (ret != 0) { | |
9730260e DG |
2557 | goto error; |
2558 | } | |
2559 | ||
7f79d3a1 | 2560 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2561 | |
2562 | break; | |
2563 | } | |
d78d6610 | 2564 | #if 0 |
9730260e DG |
2565 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2566 | case LTTNG_DOMAIN_UST_PID: | |
2567 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2568 | #endif |
54d01ffb | 2569 | default: |
1ab1ea0b | 2570 | ret = LTTCOMM_UND; |
54d01ffb | 2571 | goto error; |
26cc6b4e | 2572 | } |
e953ef25 | 2573 | |
54d01ffb | 2574 | ret = LTTCOMM_OK; |
e953ef25 | 2575 | |
54d01ffb DG |
2576 | error: |
2577 | return ret; | |
2578 | } | |
f5177a38 | 2579 | |
54d01ffb DG |
2580 | /* |
2581 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2582 | */ | |
2583 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2584 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2585 | { | |
2586 | int ret; | |
f5177a38 | 2587 | |
54d01ffb DG |
2588 | switch (domain) { |
2589 | case LTTNG_DOMAIN_KERNEL: | |
2590 | /* Add kernel context to kernel tracer */ | |
2591 | ret = context_kernel_add(session->kernel_session, ctx, | |
2592 | event_name, channel_name); | |
2593 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2594 | goto error; |
e953ef25 | 2595 | } |
2bdd86d4 MD |
2596 | break; |
2597 | case LTTNG_DOMAIN_UST: | |
2598 | { | |
55cc08a6 | 2599 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2600 | |
55cc08a6 DG |
2601 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2602 | if (ret != LTTCOMM_OK) { | |
2603 | goto error; | |
2bdd86d4 | 2604 | } |
e953ef25 | 2605 | break; |
2bdd86d4 | 2606 | } |
d78d6610 | 2607 | #if 0 |
55cc08a6 DG |
2608 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2609 | case LTTNG_DOMAIN_UST_PID: | |
2610 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2611 | #endif |
54d01ffb | 2612 | default: |
1ab1ea0b | 2613 | ret = LTTCOMM_UND; |
54d01ffb | 2614 | goto error; |
e953ef25 | 2615 | } |
950131af | 2616 | |
54d01ffb | 2617 | ret = LTTCOMM_OK; |
950131af | 2618 | |
54d01ffb DG |
2619 | error: |
2620 | return ret; | |
2621 | } | |
2622 | ||
2623 | /* | |
2624 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2625 | */ | |
2626 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2627 | char *channel_name, struct lttng_event *event) | |
2628 | { | |
2629 | int ret; | |
f6cd6b0f | 2630 | struct lttng_channel *attr; |
48842b30 | 2631 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2632 | |
2633 | switch (domain) { | |
2634 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2635 | { |
2636 | struct ltt_kernel_channel *kchan; | |
2637 | ||
54d01ffb DG |
2638 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2639 | session->kernel_session); | |
2640 | if (kchan == NULL) { | |
f6cd6b0f DG |
2641 | attr = channel_new_default_attr(domain); |
2642 | if (attr == NULL) { | |
2643 | ret = LTTCOMM_FATAL; | |
2644 | goto error; | |
2645 | } | |
2646 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2647 | ||
54d01ffb | 2648 | /* This call will notify the kernel thread */ |
44d3bd01 | 2649 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2650 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2651 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2652 | free(attr); |
f5177a38 DG |
2653 | goto error; |
2654 | } | |
ff4d74e6 | 2655 | free(attr); |
54d01ffb | 2656 | } |
950131af | 2657 | |
54d01ffb DG |
2658 | /* Get the newly created kernel channel pointer */ |
2659 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2660 | session->kernel_session); | |
2661 | if (kchan == NULL) { | |
2662 | /* This sould not happen... */ | |
2663 | ret = LTTCOMM_FATAL; | |
2664 | goto error; | |
2665 | } | |
f5177a38 | 2666 | |
48842b30 DG |
2667 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2668 | event); | |
54d01ffb | 2669 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2670 | goto error; |
950131af DG |
2671 | } |
2672 | ||
54d01ffb | 2673 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2674 | break; |
2bdd86d4 MD |
2675 | } |
2676 | case LTTNG_DOMAIN_UST: | |
2677 | { | |
aea829b3 | 2678 | struct lttng_channel *attr; |
edb67388 | 2679 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2680 | |
edb67388 | 2681 | /* Get channel from global UST domain */ |
48842b30 DG |
2682 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2683 | channel_name); | |
2684 | if (uchan == NULL) { | |
aea829b3 DG |
2685 | /* Create default channel */ |
2686 | attr = channel_new_default_attr(domain); | |
2687 | if (attr == NULL) { | |
2688 | ret = LTTCOMM_FATAL; | |
2689 | goto error; | |
2690 | } | |
596219f7 | 2691 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2692 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2693 | |
7885e399 | 2694 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2695 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2696 | free(attr); |
aea829b3 DG |
2697 | goto error; |
2698 | } | |
aea829b3 DG |
2699 | free(attr); |
2700 | ||
2701 | /* Get the newly created channel reference back */ | |
2702 | uchan = trace_ust_find_channel_by_name( | |
2703 | usess->domain_global.channels, channel_name); | |
2704 | if (uchan == NULL) { | |
2705 | /* Something is really wrong */ | |
2706 | ret = LTTCOMM_FATAL; | |
2707 | goto error; | |
2708 | } | |
48842b30 | 2709 | } |
2bdd86d4 | 2710 | |
edb67388 | 2711 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2712 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2713 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2714 | goto error; |
2bdd86d4 MD |
2715 | } |
2716 | break; | |
2717 | } | |
d78d6610 | 2718 | #if 0 |
2bdd86d4 MD |
2719 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2720 | case LTTNG_DOMAIN_UST_PID: | |
2721 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2722 | #endif |
54d01ffb | 2723 | default: |
1ab1ea0b | 2724 | ret = LTTCOMM_UND; |
54d01ffb | 2725 | goto error; |
950131af | 2726 | } |
d36b8583 | 2727 | |
54d01ffb | 2728 | ret = LTTCOMM_OK; |
d36b8583 | 2729 | |
54d01ffb DG |
2730 | error: |
2731 | return ret; | |
2732 | } | |
7d29a247 | 2733 | |
54d01ffb DG |
2734 | /* |
2735 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2736 | */ | |
2737 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2738 | char *channel_name, int event_type) |
54d01ffb DG |
2739 | { |
2740 | int ret; | |
2741 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2742 | |
54d01ffb DG |
2743 | switch (domain) { |
2744 | case LTTNG_DOMAIN_KERNEL: | |
2745 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2746 | session->kernel_session); | |
2747 | if (kchan == NULL) { | |
2748 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2749 | ret = channel_kernel_create(session->kernel_session, NULL, |
2750 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2751 | if (ret != LTTCOMM_OK) { |
2752 | goto error; | |
d36b8583 | 2753 | } |
0d0c377a | 2754 | |
8f69e5eb DG |
2755 | /* Get the newly created kernel channel pointer */ |
2756 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2757 | session->kernel_session); | |
2758 | if (kchan == NULL) { | |
2759 | /* This sould not happen... */ | |
2760 | ret = LTTCOMM_FATAL; | |
2761 | goto error; | |
2762 | } | |
2763 | ||
54d01ffb | 2764 | } |
0fdd1e2c | 2765 | |
7a3d1328 | 2766 | switch (event_type) { |
76d45b40 | 2767 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2768 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2769 | kchan, kernel_tracer_fd); |
7a3d1328 | 2770 | break; |
76d45b40 | 2771 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2772 | /* |
7a3d1328 MD |
2773 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2774 | * events already registered to the channel. | |
8c9ae521 | 2775 | */ |
7a3d1328 MD |
2776 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2777 | kchan, kernel_tracer_fd); | |
2778 | break; | |
76d45b40 | 2779 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2780 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2781 | ret = event_kernel_enable_all(session->kernel_session, |
2782 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2783 | break; |
2784 | default: | |
2785 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2786 | goto error; | |
8c9ae521 | 2787 | } |
8f69e5eb DG |
2788 | |
2789 | /* Manage return value */ | |
54d01ffb | 2790 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2791 | goto error; |
d36b8583 DG |
2792 | } |
2793 | ||
54d01ffb | 2794 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2795 | break; |
76d45b40 DG |
2796 | case LTTNG_DOMAIN_UST: |
2797 | { | |
2798 | struct lttng_channel *attr; | |
2799 | struct ltt_ust_channel *uchan; | |
2800 | struct ltt_ust_session *usess = session->ust_session; | |
2801 | ||
2802 | /* Get channel from global UST domain */ | |
2803 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2804 | channel_name); | |
2805 | if (uchan == NULL) { | |
2806 | /* Create default channel */ | |
2807 | attr = channel_new_default_attr(domain); | |
2808 | if (attr == NULL) { | |
2809 | ret = LTTCOMM_FATAL; | |
2810 | goto error; | |
2811 | } | |
2812 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2813 | attr->name[NAME_MAX - 1] = '\0'; | |
2814 | ||
2815 | /* Use the internal command enable channel */ | |
7885e399 | 2816 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2817 | if (ret != LTTCOMM_OK) { |
2818 | free(attr); | |
2819 | goto error; | |
2820 | } | |
2821 | free(attr); | |
2822 | ||
2823 | /* Get the newly created channel reference back */ | |
2824 | uchan = trace_ust_find_channel_by_name( | |
2825 | usess->domain_global.channels, channel_name); | |
2826 | if (uchan == NULL) { | |
2827 | /* Something is really wrong */ | |
2828 | ret = LTTCOMM_FATAL; | |
2829 | goto error; | |
2830 | } | |
2831 | } | |
2832 | ||
2833 | /* At this point, the session and channel exist on the tracer */ | |
2834 | ||
2835 | switch (event_type) { | |
2836 | case LTTNG_EVENT_ALL: | |
2837 | case LTTNG_EVENT_TRACEPOINT: | |
2838 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2839 | if (ret != LTTCOMM_OK) { | |
2840 | goto error; | |
2841 | } | |
2842 | break; | |
2843 | default: | |
2844 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2845 | goto error; | |
2846 | } | |
2847 | ||
2848 | /* Manage return value */ | |
2849 | if (ret != LTTCOMM_OK) { | |
2850 | goto error; | |
2851 | } | |
2852 | ||
2853 | break; | |
2854 | } | |
d78d6610 | 2855 | #if 0 |
76d45b40 DG |
2856 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2857 | case LTTNG_DOMAIN_UST_PID: | |
2858 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2859 | #endif |
54d01ffb | 2860 | default: |
1ab1ea0b | 2861 | ret = LTTCOMM_UND; |
54d01ffb | 2862 | goto error; |
d36b8583 | 2863 | } |
f3ed775e | 2864 | |
54d01ffb DG |
2865 | ret = LTTCOMM_OK; |
2866 | ||
2867 | error: | |
2868 | return ret; | |
2869 | } | |
2870 | ||
2871 | /* | |
2872 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2873 | */ | |
2874 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2875 | { | |
2876 | int ret; | |
2877 | ssize_t nb_events = 0; | |
2878 | ||
2879 | switch (domain) { | |
2880 | case LTTNG_DOMAIN_KERNEL: | |
2881 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2882 | if (nb_events < 0) { | |
2883 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2884 | goto error; | |
894be886 | 2885 | } |
54d01ffb | 2886 | break; |
b551a063 DG |
2887 | case LTTNG_DOMAIN_UST: |
2888 | nb_events = ust_app_list_events(events); | |
2889 | if (nb_events < 0) { | |
2890 | ret = LTTCOMM_UST_LIST_FAIL; | |
2891 | goto error; | |
2892 | } | |
2893 | break; | |
54d01ffb | 2894 | default: |
1ab1ea0b | 2895 | ret = LTTCOMM_UND; |
54d01ffb DG |
2896 | goto error; |
2897 | } | |
894be886 | 2898 | |
54d01ffb | 2899 | return nb_events; |
7d29a247 | 2900 | |
54d01ffb DG |
2901 | error: |
2902 | /* Return negative value to differentiate return code */ | |
2903 | return -ret; | |
2904 | } | |
b389abbe | 2905 | |
54d01ffb DG |
2906 | /* |
2907 | * Command LTTNG_START_TRACE processed by the client thread. | |
2908 | */ | |
2909 | static int cmd_start_trace(struct ltt_session *session) | |
2910 | { | |
2911 | int ret; | |
54d01ffb | 2912 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2913 | struct ltt_ust_session *usess; |
b389abbe | 2914 | |
54d01ffb DG |
2915 | /* Short cut */ |
2916 | ksession = session->kernel_session; | |
b9d9b220 | 2917 | usess = session->ust_session; |
5eb91c98 | 2918 | |
b9ef1c83 | 2919 | if (session->enabled) { |
80e327fa DG |
2920 | /* Already started. */ |
2921 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2922 | goto error; |
2923 | } | |
2924 | ||
464dd62d MD |
2925 | session->enabled = 1; |
2926 | ||
54d01ffb DG |
2927 | /* Kernel tracing */ |
2928 | if (ksession != NULL) { | |
2bdd86d4 MD |
2929 | struct ltt_kernel_channel *kchan; |
2930 | ||
54d01ffb DG |
2931 | /* Open kernel metadata */ |
2932 | if (ksession->metadata == NULL) { | |
2933 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2934 | if (ret < 0) { | |
2935 | ret = LTTCOMM_KERN_META_FAIL; | |
2936 | goto error; | |
b389abbe | 2937 | } |
54d01ffb | 2938 | } |
7d29a247 | 2939 | |
54d01ffb | 2940 | /* Open kernel metadata stream */ |
03550b58 | 2941 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2942 | ret = kernel_open_metadata_stream(ksession); |
2943 | if (ret < 0) { | |
2944 | ERR("Kernel create metadata stream failed"); | |
2945 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2946 | goto error; | |
2947 | } | |
2948 | } | |
2949 | ||
2950 | /* For each channel */ | |
2951 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2952 | if (kchan->stream_count == 0) { | |
2953 | ret = kernel_open_channel_stream(kchan); | |
2954 | if (ret < 0) { | |
2955 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2956 | goto error; |
2957 | } | |
54d01ffb DG |
2958 | /* Update the stream global counter */ |
2959 | ksession->stream_count_global += ret; | |
7d29a247 | 2960 | } |
54d01ffb DG |
2961 | } |
2962 | ||
2963 | /* Setup kernel consumer socket and send fds to it */ | |
2964 | ret = init_kernel_tracing(ksession); | |
2965 | if (ret < 0) { | |
2966 | ret = LTTCOMM_KERN_START_FAIL; | |
2967 | goto error; | |
2968 | } | |
2969 | ||
2970 | /* This start the kernel tracing */ | |
2971 | ret = kernel_start_session(ksession); | |
2972 | if (ret < 0) { | |
2973 | ret = LTTCOMM_KERN_START_FAIL; | |
2974 | goto error; | |
2975 | } | |
2976 | ||
2977 | /* Quiescent wait after starting trace */ | |
2978 | kernel_wait_quiescent(kernel_tracer_fd); | |
2979 | } | |
2980 | ||
36dc12cc | 2981 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2982 | if (usess) { |
2983 | usess->start_trace = 1; | |
36dc12cc | 2984 | |
b9d9b220 DG |
2985 | ret = ust_app_start_trace_all(usess); |
2986 | if (ret < 0) { | |
2987 | ret = LTTCOMM_UST_START_FAIL; | |
2988 | goto error; | |
2989 | } | |
2bdd86d4 | 2990 | } |
54d01ffb DG |
2991 | |
2992 | ret = LTTCOMM_OK; | |
2993 | ||
2994 | error: | |
2995 | return ret; | |
2996 | } | |
2997 | ||
2998 | /* | |
2999 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
3000 | */ | |
3001 | static int cmd_stop_trace(struct ltt_session *session) | |
3002 | { | |
3003 | int ret; | |
3004 | struct ltt_kernel_channel *kchan; | |
3005 | struct ltt_kernel_session *ksession; | |
8be98f9a | 3006 | struct ltt_ust_session *usess; |
54d01ffb DG |
3007 | |
3008 | /* Short cut */ | |
3009 | ksession = session->kernel_session; | |
8be98f9a | 3010 | usess = session->ust_session; |
54d01ffb | 3011 | |
b9ef1c83 | 3012 | if (!session->enabled) { |
80e327fa | 3013 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
3014 | goto error; |
3015 | } | |
3016 | ||
464dd62d MD |
3017 | session->enabled = 0; |
3018 | ||
54d01ffb DG |
3019 | /* Kernel tracer */ |
3020 | if (ksession != NULL) { | |
3021 | DBG("Stop kernel tracing"); | |
3022 | ||
3023 | /* Flush all buffers before stopping */ | |
3024 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
3025 | if (ret < 0) { | |
3026 | ERR("Kernel metadata flush failed"); | |
3027 | } | |
f34daff7 | 3028 | |
54d01ffb DG |
3029 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3030 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3031 | if (ret < 0) { |
54d01ffb | 3032 | ERR("Kernel flush buffer error"); |
7d29a247 | 3033 | } |
54d01ffb | 3034 | } |
19e70852 | 3035 | |
54d01ffb DG |
3036 | ret = kernel_stop_session(ksession); |
3037 | if (ret < 0) { | |
3038 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3039 | goto error; |
f3ed775e | 3040 | } |
54d01ffb DG |
3041 | |
3042 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3043 | } |
54d01ffb | 3044 | |
8be98f9a MD |
3045 | if (usess) { |
3046 | usess->start_trace = 0; | |
2bdd86d4 | 3047 | |
8be98f9a | 3048 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3049 | if (ret < 0) { |
190df5ac | 3050 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3051 | goto error; |
3052 | } | |
2bdd86d4 | 3053 | } |
54d01ffb DG |
3054 | |
3055 | ret = LTTCOMM_OK; | |
3056 | ||
3057 | error: | |
3058 | return ret; | |
3059 | } | |
3060 | ||
3061 | /* | |
3062 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3063 | */ | |
730389d9 | 3064 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
3065 | { |
3066 | int ret; | |
3067 | ||
730389d9 DG |
3068 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3069 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
3070 | if (ret != LTTCOMM_OK) { |
3071 | goto error; | |
3072 | } | |
3073 | ||
3074 | ret = LTTCOMM_OK; | |
3075 | ||
3076 | error: | |
3077 | return ret; | |
3078 | } | |
3079 | ||
3080 | /* | |
3081 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3082 | */ | |
3083 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3084 | { | |
3085 | int ret; | |
3086 | ||
3087 | /* Clean kernel session teardown */ | |
3088 | teardown_kernel_session(session); | |
84cd17c6 MD |
3089 | /* UST session teardown */ |
3090 | teardown_ust_session(session); | |
54d01ffb DG |
3091 | |
3092 | /* | |
3093 | * Must notify the kernel thread here to update it's poll setin order | |
3094 | * to remove the channel(s)' fd just destroyed. | |
3095 | */ | |
3096 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3097 | if (ret < 0) { | |
76d7553f | 3098 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3099 | } |
3100 | ||
271933a4 | 3101 | ret = session_destroy(session); |
54d01ffb DG |
3102 | |
3103 | return ret; | |
3104 | } | |
3105 | ||
3106 | /* | |
3107 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3108 | */ | |
3109 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3110 | { | |
3111 | int ret; | |
3112 | ||
3113 | switch (domain) { | |
3114 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3115 | { |
54d01ffb | 3116 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3117 | |
54d01ffb DG |
3118 | kcalibrate.type = calibrate->type; |
3119 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3120 | if (ret < 0) { |
54d01ffb DG |
3121 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3122 | goto error; | |
33a2b854 | 3123 | } |
54d01ffb DG |
3124 | break; |
3125 | } | |
4466912f DG |
3126 | case LTTNG_DOMAIN_UST: |
3127 | { | |
3128 | struct lttng_ust_calibrate ucalibrate; | |
3129 | ||
3130 | ucalibrate.type = calibrate->type; | |
3131 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3132 | if (ret < 0) { | |
3133 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3134 | goto error; | |
3135 | } | |
3136 | break; | |
3137 | } | |
54d01ffb | 3138 | default: |
1ab1ea0b | 3139 | ret = LTTCOMM_UND; |
54d01ffb DG |
3140 | goto error; |
3141 | } | |
33a2b854 | 3142 | |
54d01ffb | 3143 | ret = LTTCOMM_OK; |
33a2b854 | 3144 | |
54d01ffb DG |
3145 | error: |
3146 | return ret; | |
3147 | } | |
7d29a247 | 3148 | |
54d01ffb DG |
3149 | /* |
3150 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3151 | */ | |
3152 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3153 | char *sock_path) | |
3154 | { | |
3155 | int ret, sock; | |
b389abbe | 3156 | |
54d01ffb DG |
3157 | switch (domain) { |
3158 | case LTTNG_DOMAIN_KERNEL: | |
3159 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3160 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3161 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3162 | goto error; | |
3163 | } | |
3164 | ||
3165 | sock = lttcomm_connect_unix_sock(sock_path); | |
3166 | if (sock < 0) { | |
3167 | ret = LTTCOMM_CONNECT_FAIL; | |
3168 | goto error; | |
3169 | } | |
3170 | ||
3171 | session->kernel_session->consumer_fd = sock; | |
3172 | break; | |
3173 | default: | |
3174 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3175 | ret = LTTCOMM_UND; |
54d01ffb DG |
3176 | goto error; |
3177 | } | |
3178 | ||
3179 | ret = LTTCOMM_OK; | |
3180 | ||
3181 | error: | |
3182 | return ret; | |
3183 | } | |
3184 | ||
3185 | /* | |
3186 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3187 | */ | |
3188 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3189 | struct lttng_domain **domains) | |
3190 | { | |
b551a063 | 3191 | int ret, index = 0; |
54d01ffb DG |
3192 | ssize_t nb_dom = 0; |
3193 | ||
3194 | if (session->kernel_session != NULL) { | |
b551a063 | 3195 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3196 | nb_dom++; |
3197 | } | |
3198 | ||
b551a063 DG |
3199 | if (session->ust_session != NULL) { |
3200 | DBG3("Listing domains found UST global domain"); | |
3201 | nb_dom++; | |
3202 | } | |
54d01ffb | 3203 | |
b551a063 | 3204 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3205 | if (*domains == NULL) { |
3206 | ret = -LTTCOMM_FATAL; | |
3207 | goto error; | |
3208 | } | |
3209 | ||
b551a063 DG |
3210 | if (session->kernel_session != NULL) { |
3211 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3212 | index++; | |
3213 | } | |
3214 | ||
3215 | if (session->ust_session != NULL) { | |
3216 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3217 | index++; | |
3218 | } | |
54d01ffb | 3219 | |
54d01ffb DG |
3220 | return nb_dom; |
3221 | ||
3222 | error: | |
3223 | return ret; | |
3224 | } | |
3225 | ||
3226 | /* | |
3227 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3228 | */ | |
b551a063 | 3229 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3230 | struct lttng_channel **channels) |
3231 | { | |
3232 | int ret; | |
3233 | ssize_t nb_chan = 0; | |
3234 | ||
b551a063 DG |
3235 | switch (domain) { |
3236 | case LTTNG_DOMAIN_KERNEL: | |
3237 | if (session->kernel_session != NULL) { | |
3238 | nb_chan = session->kernel_session->channel_count; | |
3239 | } | |
0df502fd | 3240 | DBG3("Number of kernel channels %zd", nb_chan); |
c119cdb1 DG |
3241 | if (nb_chan <= 0) { |
3242 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
3243 | } | |
b551a063 DG |
3244 | break; |
3245 | case LTTNG_DOMAIN_UST: | |
3246 | if (session->ust_session != NULL) { | |
bec39940 | 3247 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3248 | session->ust_session->domain_global.channels); |
3249 | } | |
0df502fd | 3250 | DBG3("Number of UST global channels %zd", nb_chan); |
c119cdb1 DG |
3251 | if (nb_chan <= 0) { |
3252 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
3253 | } | |
b551a063 DG |
3254 | break; |
3255 | default: | |
3256 | *channels = NULL; | |
1ab1ea0b | 3257 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3258 | goto error; |
3259 | } | |
3260 | ||
b551a063 DG |
3261 | if (nb_chan > 0) { |
3262 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3263 | if (*channels == NULL) { | |
3264 | ret = -LTTCOMM_FATAL; | |
3265 | goto error; | |
3266 | } | |
54d01ffb | 3267 | |
b551a063 DG |
3268 | list_lttng_channels(domain, session, *channels); |
3269 | } else { | |
3270 | *channels = NULL; | |
c119cdb1 DG |
3271 | /* Ret value was set in the domain switch case */ |
3272 | goto error; | |
b551a063 | 3273 | } |
2bdd86d4 | 3274 | |
54d01ffb DG |
3275 | return nb_chan; |
3276 | ||
3277 | error: | |
3278 | return ret; | |
3279 | } | |
3280 | ||
3281 | /* | |
3282 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3283 | */ | |
b551a063 | 3284 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3285 | char *channel_name, struct lttng_event **events) |
3286 | { | |
b551a063 | 3287 | int ret = 0; |
54d01ffb | 3288 | ssize_t nb_event = 0; |
54d01ffb | 3289 | |
b551a063 DG |
3290 | switch (domain) { |
3291 | case LTTNG_DOMAIN_KERNEL: | |
3292 | if (session->kernel_session != NULL) { | |
3293 | nb_event = list_lttng_kernel_events(channel_name, | |
3294 | session->kernel_session, events); | |
54d01ffb | 3295 | } |
b551a063 DG |
3296 | break; |
3297 | case LTTNG_DOMAIN_UST: | |
3298 | { | |
3299 | if (session->ust_session != NULL) { | |
3300 | nb_event = list_lttng_ust_global_events(channel_name, | |
3301 | &session->ust_session->domain_global, events); | |
3302 | } | |
3303 | break; | |
54d01ffb | 3304 | } |
b551a063 | 3305 | default: |
1ab1ea0b | 3306 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3307 | goto error; |
3308 | } | |
3309 | ||
b551a063 | 3310 | ret = nb_event; |
54d01ffb DG |
3311 | |
3312 | error: | |
3313 | return ret; | |
3314 | } | |
3315 | ||
3316 | /* | |
3317 | * Process the command requested by the lttng client within the command | |
3318 | * context structure. This function make sure that the return structure (llm) | |
3319 | * is set and ready for transmission before returning. | |
3320 | * | |
3321 | * Return any error encountered or 0 for success. | |
3322 | */ | |
3323 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3324 | { | |
3325 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3326 | int need_tracing_session = 1; |
2e09ba09 | 3327 | int need_domain; |
54d01ffb DG |
3328 | |
3329 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3330 | ||
2e09ba09 MD |
3331 | switch (cmd_ctx->lsm->cmd_type) { |
3332 | case LTTNG_CREATE_SESSION: | |
3333 | case LTTNG_DESTROY_SESSION: | |
3334 | case LTTNG_LIST_SESSIONS: | |
3335 | case LTTNG_LIST_DOMAINS: | |
3336 | case LTTNG_START_TRACE: | |
3337 | case LTTNG_STOP_TRACE: | |
3338 | need_domain = 0; | |
3aace903 | 3339 | break; |
2e09ba09 MD |
3340 | default: |
3341 | need_domain = 1; | |
3342 | } | |
3343 | ||
3344 | if (opt_no_kernel && need_domain | |
3345 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3346 | if (!is_root) { |
3347 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3348 | } else { | |
3349 | ret = LTTCOMM_KERN_NA; | |
3350 | } | |
4fba7219 DG |
3351 | goto error; |
3352 | } | |
3353 | ||
54d01ffb DG |
3354 | /* |
3355 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3356 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3357 | * command. |
3358 | */ | |
3359 | switch(cmd_ctx->lsm->cmd_type) { | |
3360 | case LTTNG_LIST_SESSIONS: | |
3361 | case LTTNG_LIST_TRACEPOINTS: | |
3362 | case LTTNG_LIST_DOMAINS: | |
3363 | case LTTNG_LIST_CHANNELS: | |
3364 | case LTTNG_LIST_EVENTS: | |
3365 | break; | |
3366 | default: | |
3367 | /* Setup lttng message with no payload */ | |
3368 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3369 | if (ret < 0) { | |
3370 | /* This label does not try to unlock the session */ | |
3371 | goto init_setup_error; | |
3372 | } | |
3373 | } | |
3374 | ||
3375 | /* Commands that DO NOT need a session. */ | |
3376 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3377 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3378 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3379 | case LTTNG_LIST_SESSIONS: |
3380 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3381 | need_tracing_session = 0; |
54d01ffb DG |
3382 | break; |
3383 | default: | |
3384 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3385 | /* |
3386 | * We keep the session list lock across _all_ commands | |
3387 | * for now, because the per-session lock does not | |
3388 | * handle teardown properly. | |
3389 | */ | |
74babd95 | 3390 | session_lock_list(); |
54d01ffb DG |
3391 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3392 | if (cmd_ctx->session == NULL) { | |
3393 | if (cmd_ctx->lsm->session.name != NULL) { | |
3394 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3395 | } else { | |
3396 | /* If no session name specified */ | |
3397 | ret = LTTCOMM_SELECT_SESS; | |
3398 | } | |
3399 | goto error; | |
3400 | } else { | |
3401 | /* Acquire lock for the session */ | |
3402 | session_lock(cmd_ctx->session); | |
3403 | } | |
3404 | break; | |
3405 | } | |
b389abbe | 3406 | |
2e09ba09 MD |
3407 | if (!need_domain) { |
3408 | goto skip_domain; | |
3409 | } | |
54d01ffb DG |
3410 | /* |
3411 | * Check domain type for specific "pre-action". | |
3412 | */ | |
3413 | switch (cmd_ctx->lsm->domain.type) { | |
3414 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3415 | if (!is_root) { |
531d29f9 | 3416 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3417 | goto error; |
3418 | } | |
3419 | ||
54d01ffb | 3420 | /* Kernel tracer check */ |
a4b35e07 | 3421 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3422 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3423 | ret = init_kernel_tracer(); |
3424 | if (ret != 0) { | |
54d01ffb DG |
3425 | goto error; |
3426 | } | |
3427 | } | |
5eb91c98 | 3428 | |
f22d70f0 DG |
3429 | /* Consumer is in an ERROR state. Report back to client */ |
3430 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
3431 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3432 | goto error; | |
3433 | } | |
3434 | ||
54d01ffb | 3435 | /* Need a session for kernel command */ |
44d3bd01 | 3436 | if (need_tracing_session) { |
54d01ffb | 3437 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3438 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3439 | if (ret < 0) { |
54d01ffb | 3440 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3441 | goto error; |
3442 | } | |
b389abbe | 3443 | } |
7d29a247 | 3444 | |
54d01ffb | 3445 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3446 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3447 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3448 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3449 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3450 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3451 | if (ret < 0) { |
54d01ffb DG |
3452 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3453 | goto error; | |
950131af | 3454 | } |
f22d70f0 | 3455 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3456 | } else { |
3457 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3458 | } |
0d0c377a | 3459 | } |
f22d70f0 | 3460 | |
54d01ffb | 3461 | break; |
2bdd86d4 | 3462 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3463 | { |
f22d70f0 DG |
3464 | /* Consumer is in an ERROR state. Report back to client */ |
3465 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
3466 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3467 | goto error; | |
3468 | } | |
3469 | ||
44d3bd01 | 3470 | if (need_tracing_session) { |
f6a9efaa | 3471 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3472 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3473 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3474 | if (ret != LTTCOMM_OK) { |
3475 | goto error; | |
3476 | } | |
3477 | } | |
7753dea8 MD |
3478 | /* Start the UST consumer daemons */ |
3479 | /* 64-bit */ | |
3480 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3481 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3482 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3483 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3484 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3485 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3486 | if (ret < 0) { |
7753dea8 MD |
3487 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3488 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3489 | goto error; |
3490 | } | |
48842b30 | 3491 | |
7753dea8 | 3492 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
f22d70f0 | 3493 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3494 | } else { |
7753dea8 MD |
3495 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3496 | } | |
3497 | /* 32-bit */ | |
fc7a59ce | 3498 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3499 | ustconsumer32_data.pid == 0 && |
3500 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3501 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3502 | ret = start_consumerd(&ustconsumer32_data); | |
3503 | if (ret < 0) { | |
3504 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3505 | ust_consumerd32_fd = -EINVAL; | |
3506 | goto error; | |
3507 | } | |
f22d70f0 | 3508 | |
7753dea8 | 3509 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
f22d70f0 | 3510 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3511 | } else { |
3512 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3513 | } |
44d3bd01 DG |
3514 | } |
3515 | break; | |
48842b30 | 3516 | } |
54d01ffb | 3517 | default: |
54d01ffb DG |
3518 | break; |
3519 | } | |
2e09ba09 | 3520 | skip_domain: |
33a2b854 | 3521 | |
f22d70f0 DG |
3522 | /* Validate consumer daemon state when start/stop trace command */ |
3523 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3524 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3525 | switch (cmd_ctx->lsm->domain.type) { | |
3526 | case LTTNG_DOMAIN_UST: | |
3527 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
3528 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3529 | goto error; | |
3530 | } | |
3531 | break; | |
3532 | case LTTNG_DOMAIN_KERNEL: | |
3533 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
3534 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3535 | goto error; | |
3536 | } | |
3537 | break; | |
3538 | } | |
3539 | } | |
3540 | ||
8e0af1b4 MD |
3541 | /* |
3542 | * Check that the UID or GID match that of the tracing session. | |
3543 | * The root user can interact with all sessions. | |
3544 | */ | |
3545 | if (need_tracing_session) { | |
3546 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3547 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3548 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3549 | ret = LTTCOMM_EPERM; |
3550 | goto error; | |
3551 | } | |
3552 | } | |
3553 | ||
54d01ffb DG |
3554 | /* Process by command type */ |
3555 | switch (cmd_ctx->lsm->cmd_type) { | |
3556 | case LTTNG_ADD_CONTEXT: | |
3557 | { | |
3558 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3559 | cmd_ctx->lsm->u.context.channel_name, | |
3560 | cmd_ctx->lsm->u.context.event_name, | |
3561 | &cmd_ctx->lsm->u.context.ctx); | |
3562 | break; | |
3563 | } | |
3564 | case LTTNG_DISABLE_CHANNEL: | |
3565 | { | |
3566 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3567 | cmd_ctx->lsm->u.disable.channel_name); | |
3568 | break; | |
3569 | } | |
3570 | case LTTNG_DISABLE_EVENT: | |
3571 | { | |
3572 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3573 | cmd_ctx->lsm->u.disable.channel_name, | |
3574 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3575 | break; |
3576 | } | |
54d01ffb DG |
3577 | case LTTNG_DISABLE_ALL_EVENT: |
3578 | { | |
2bdd86d4 | 3579 | DBG("Disabling all events"); |
54d01ffb DG |
3580 | |
3581 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3582 | cmd_ctx->lsm->u.disable.channel_name); | |
3583 | break; | |
3584 | } | |
3585 | case LTTNG_ENABLE_CHANNEL: | |
3586 | { | |
aea829b3 | 3587 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3588 | &cmd_ctx->lsm->u.channel.chan); |
3589 | break; | |
3590 | } | |
3591 | case LTTNG_ENABLE_EVENT: | |
3592 | { | |
3593 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3594 | cmd_ctx->lsm->u.enable.channel_name, | |
3595 | &cmd_ctx->lsm->u.enable.event); | |
3596 | break; | |
3597 | } | |
3598 | case LTTNG_ENABLE_ALL_EVENT: | |
3599 | { | |
2bdd86d4 | 3600 | DBG("Enabling all events"); |
54d01ffb DG |
3601 | |
3602 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3603 | cmd_ctx->lsm->u.enable.channel_name, |
3604 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3605 | break; |
3606 | } | |
052da939 | 3607 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3608 | { |
9f19cc17 | 3609 | struct lttng_event *events; |
54d01ffb | 3610 | ssize_t nb_events; |
052da939 | 3611 | |
54d01ffb DG |
3612 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3613 | if (nb_events < 0) { | |
3614 | ret = -nb_events; | |
3615 | goto error; | |
2ef84c95 DG |
3616 | } |
3617 | ||
3618 | /* | |
3619 | * Setup lttng message with payload size set to the event list size in | |
3620 | * bytes and then copy list into the llm payload. | |
3621 | */ | |
052da939 | 3622 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3623 | if (ret < 0) { |
052da939 | 3624 | free(events); |
2ef84c95 DG |
3625 | goto setup_error; |
3626 | } | |
3627 | ||
3628 | /* Copy event list into message payload */ | |
9f19cc17 | 3629 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3630 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3631 | |
9f19cc17 | 3632 | free(events); |
2ef84c95 DG |
3633 | |
3634 | ret = LTTCOMM_OK; | |
3635 | break; | |
3636 | } | |
f3ed775e | 3637 | case LTTNG_START_TRACE: |
8c0faa1d | 3638 | { |
54d01ffb | 3639 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3640 | break; |
3641 | } | |
f3ed775e | 3642 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3643 | { |
54d01ffb | 3644 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3645 | break; |
3646 | } | |
5e16da05 MD |
3647 | case LTTNG_CREATE_SESSION: |
3648 | { | |
54d01ffb | 3649 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3650 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3651 | break; |
3652 | } | |
3653 | case LTTNG_DESTROY_SESSION: | |
3654 | { | |
54d01ffb DG |
3655 | ret = cmd_destroy_session(cmd_ctx->session, |
3656 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
3657 | /* |
3658 | * Set session to NULL so we do not unlock it after | |
3659 | * free. | |
3660 | */ | |
3661 | cmd_ctx->session = NULL; | |
5461b305 | 3662 | break; |
5e16da05 | 3663 | } |
9f19cc17 | 3664 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3665 | { |
54d01ffb DG |
3666 | ssize_t nb_dom; |
3667 | struct lttng_domain *domains; | |
5461b305 | 3668 | |
54d01ffb DG |
3669 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3670 | if (nb_dom < 0) { | |
3671 | ret = -nb_dom; | |
3672 | goto error; | |
ce3d728c | 3673 | } |
520ff687 | 3674 | |
54d01ffb | 3675 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3676 | if (ret < 0) { |
3677 | goto setup_error; | |
520ff687 | 3678 | } |
57167058 | 3679 | |
54d01ffb DG |
3680 | /* Copy event list into message payload */ |
3681 | memcpy(cmd_ctx->llm->payload, domains, | |
3682 | nb_dom * sizeof(struct lttng_domain)); | |
3683 | ||
3684 | free(domains); | |
5e16da05 | 3685 | |
5461b305 | 3686 | ret = LTTCOMM_OK; |
5e16da05 MD |
3687 | break; |
3688 | } | |
9f19cc17 | 3689 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3690 | { |
9fbaebcf | 3691 | int nb_chan; |
54d01ffb DG |
3692 | struct lttng_channel *channels; |
3693 | ||
b551a063 DG |
3694 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3695 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3696 | if (nb_chan < 0) { |
3697 | ret = -nb_chan; | |
3698 | goto error; | |
5461b305 | 3699 | } |
ca95a216 | 3700 | |
54d01ffb | 3701 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3702 | if (ret < 0) { |
3703 | goto setup_error; | |
3704 | } | |
9f19cc17 | 3705 | |
54d01ffb DG |
3706 | /* Copy event list into message payload */ |
3707 | memcpy(cmd_ctx->llm->payload, channels, | |
3708 | nb_chan * sizeof(struct lttng_channel)); | |
3709 | ||
3710 | free(channels); | |
9f19cc17 DG |
3711 | |
3712 | ret = LTTCOMM_OK; | |
5461b305 | 3713 | break; |
5e16da05 | 3714 | } |
9f19cc17 | 3715 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3716 | { |
b551a063 | 3717 | ssize_t nb_event; |
684d34d2 | 3718 | struct lttng_event *events = NULL; |
9f19cc17 | 3719 | |
b551a063 | 3720 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3721 | cmd_ctx->lsm->u.list.channel_name, &events); |
3722 | if (nb_event < 0) { | |
3723 | ret = -nb_event; | |
3724 | goto error; | |
5461b305 | 3725 | } |
ca95a216 | 3726 | |
54d01ffb | 3727 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3728 | if (ret < 0) { |
3729 | goto setup_error; | |
3730 | } | |
9f19cc17 | 3731 | |
54d01ffb DG |
3732 | /* Copy event list into message payload */ |
3733 | memcpy(cmd_ctx->llm->payload, events, | |
3734 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3735 | |
54d01ffb | 3736 | free(events); |
9f19cc17 DG |
3737 | |
3738 | ret = LTTCOMM_OK; | |
5461b305 | 3739 | break; |
5e16da05 MD |
3740 | } |
3741 | case LTTNG_LIST_SESSIONS: | |
3742 | { | |
8e0af1b4 | 3743 | unsigned int nr_sessions; |
5461b305 | 3744 | |
8e0af1b4 | 3745 | session_lock_list(); |
730389d9 DG |
3746 | nr_sessions = lttng_sessions_count( |
3747 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3748 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3749 | |
8e0af1b4 | 3750 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3751 | if (ret < 0) { |
54d01ffb | 3752 | session_unlock_list(); |
5461b305 | 3753 | goto setup_error; |
e065084a | 3754 | } |
5e16da05 | 3755 | |
6c9cc2ab | 3756 | /* Filled the session array */ |
8e0af1b4 | 3757 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3758 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3759 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3760 | |
54d01ffb | 3761 | session_unlock_list(); |
5e16da05 | 3762 | |
5461b305 | 3763 | ret = LTTCOMM_OK; |
5e16da05 MD |
3764 | break; |
3765 | } | |
d0254c7c MD |
3766 | case LTTNG_CALIBRATE: |
3767 | { | |
54d01ffb DG |
3768 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3769 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3770 | break; |
3771 | } | |
d9800920 DG |
3772 | case LTTNG_REGISTER_CONSUMER: |
3773 | { | |
54d01ffb DG |
3774 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3775 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3776 | break; |
3777 | } | |
5e16da05 | 3778 | default: |
5e16da05 | 3779 | ret = LTTCOMM_UND; |
5461b305 | 3780 | break; |
fac6795d DG |
3781 | } |
3782 | ||
5461b305 | 3783 | error: |
5461b305 DG |
3784 | if (cmd_ctx->llm == NULL) { |
3785 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3786 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3787 | goto setup_error; |
3788 | } | |
3789 | } | |
54d01ffb | 3790 | /* Set return code */ |
5461b305 | 3791 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3792 | setup_error: |
b5541356 | 3793 | if (cmd_ctx->session) { |
54d01ffb | 3794 | session_unlock(cmd_ctx->session); |
b5541356 | 3795 | } |
256a5576 MD |
3796 | if (need_tracing_session) { |
3797 | session_unlock_list(); | |
3798 | } | |
54d01ffb | 3799 | init_setup_error: |
8028d920 | 3800 | return ret; |
fac6795d DG |
3801 | } |
3802 | ||
1d4b027a | 3803 | /* |
d063d709 DG |
3804 | * This thread manage all clients request using the unix client socket for |
3805 | * communication. | |
1d4b027a DG |
3806 | */ |
3807 | static void *thread_manage_clients(void *data) | |
3808 | { | |
a4b35e07 | 3809 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3810 | uint32_t revents, nb_fd; |
273ea72c | 3811 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3812 | struct lttng_poll_event events; |
1d4b027a DG |
3813 | |
3814 | DBG("[thread] Manage client started"); | |
3815 | ||
f6a9efaa DG |
3816 | rcu_register_thread(); |
3817 | ||
1d4b027a DG |
3818 | ret = lttcomm_listen_unix_sock(client_sock); |
3819 | if (ret < 0) { | |
3820 | goto error; | |
3821 | } | |
3822 | ||
5eb91c98 DG |
3823 | /* |
3824 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3825 | * more will be added to this poll set. | |
3826 | */ | |
3827 | ret = create_thread_poll_set(&events, 2); | |
3828 | if (ret < 0) { | |
3829 | goto error; | |
3830 | } | |
273ea72c | 3831 | |
5eb91c98 DG |
3832 | /* Add the application registration socket */ |
3833 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3834 | if (ret < 0) { | |
3835 | goto error; | |
3836 | } | |
273ea72c | 3837 | |
bbd973c2 DG |
3838 | /* |
3839 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3840 | */ |
3841 | if (opt_sig_parent) { | |
8db8d1dc | 3842 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3843 | } |
3844 | ||
3845 | while (1) { | |
1d4b027a | 3846 | DBG("Accepting client command ..."); |
273ea72c | 3847 | |
5eb91c98 DG |
3848 | nb_fd = LTTNG_POLL_GETNB(&events); |
3849 | ||
273ea72c | 3850 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3851 | restart: |
5eb91c98 | 3852 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3853 | if (ret < 0) { |
88f2b785 MD |
3854 | /* |
3855 | * Restart interrupted system call. | |
3856 | */ | |
3857 | if (errno == EINTR) { | |
3858 | goto restart; | |
3859 | } | |
273ea72c DG |
3860 | goto error; |
3861 | } | |
3862 | ||
5eb91c98 DG |
3863 | for (i = 0; i < nb_fd; i++) { |
3864 | /* Fetch once the poll data */ | |
3865 | revents = LTTNG_POLL_GETEV(&events, i); | |
3866 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3867 | ||
3868 | /* Thread quit pipe has been closed. Killing thread. */ | |
3869 | ret = check_thread_quit_pipe(pollfd, revents); | |
3870 | if (ret) { | |
3871 | goto error; | |
3872 | } | |
3873 | ||
3874 | /* Event on the registration socket */ | |
3875 | if (pollfd == client_sock) { | |
3876 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3877 | ERR("Client socket poll error"); | |
3878 | goto error; | |
3879 | } | |
3880 | } | |
3881 | } | |
3882 | ||
3883 | DBG("Wait for client response"); | |
3884 | ||
3885 | sock = lttcomm_accept_unix_sock(client_sock); | |
3886 | if (sock < 0) { | |
273ea72c | 3887 | goto error; |
273ea72c DG |
3888 | } |
3889 | ||
be040666 DG |
3890 | /* Set socket option for credentials retrieval */ |
3891 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3892 | if (ret < 0) { | |
3893 | goto error; | |
3894 | } | |
3895 | ||
5eb91c98 | 3896 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3897 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3898 | if (cmd_ctx == NULL) { |
76d7553f | 3899 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3900 | goto error; |
5eb91c98 | 3901 | } |
1d4b027a | 3902 | |
5eb91c98 | 3903 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3904 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3905 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3906 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3907 | goto error; |
3908 | } | |
1d4b027a | 3909 | |
5eb91c98 DG |
3910 | cmd_ctx->llm = NULL; |
3911 | cmd_ctx->session = NULL; | |
1d4b027a | 3912 | |
5eb91c98 DG |
3913 | /* |
3914 | * Data is received from the lttng client. The struct | |
3915 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3916 | * the client. | |
3917 | */ | |
3918 | DBG("Receiving data from client ..."); | |
be040666 DG |
3919 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3920 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3921 | if (ret <= 0) { |
3922 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3923 | ret = close(sock); |
3924 | if (ret) { | |
3925 | PERROR("close"); | |
3926 | } | |
3927 | sock = -1; | |
a2c0da86 | 3928 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3929 | continue; |
3930 | } | |
1d4b027a | 3931 | |
5eb91c98 DG |
3932 | // TODO: Validate cmd_ctx including sanity check for |
3933 | // security purpose. | |
f7776ea7 | 3934 | |
f6a9efaa | 3935 | rcu_thread_online(); |
5eb91c98 DG |
3936 | /* |
3937 | * This function dispatch the work to the kernel or userspace tracer | |
3938 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3939 | * informations for the client. The command context struct contains | |
3940 | * everything this function may needs. | |
3941 | */ | |
3942 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3943 | rcu_thread_offline(); |
5eb91c98 | 3944 | if (ret < 0) { |
bbd973c2 | 3945 | /* |
5eb91c98 | 3946 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3947 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3948 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3949 | */ |
bbd973c2 | 3950 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3951 | continue; |
3952 | } | |
d6e4fca4 | 3953 | |
54d01ffb DG |
3954 | DBG("Sending response (size: %d, retcode: %s)", |
3955 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3956 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3957 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3958 | if (ret < 0) { |
3959 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3960 | } |
1d4b027a | 3961 | |
5eb91c98 | 3962 | /* End of transmission */ |
76d7553f MD |
3963 | ret = close(sock); |
3964 | if (ret) { | |
3965 | PERROR("close"); | |
3966 | } | |
3967 | sock = -1; | |
be040666 DG |
3968 | |
3969 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3970 | } |
3971 | ||
5eb91c98 DG |
3972 | error: |
3973 | DBG("Client thread dying"); | |
273ea72c | 3974 | unlink(client_unix_sock_path); |
76d7553f MD |
3975 | if (client_sock >= 0) { |
3976 | ret = close(client_sock); | |
3977 | if (ret) { | |
3978 | PERROR("close"); | |
3979 | } | |
a4b35e07 MD |
3980 | } |
3981 | if (sock >= 0) { | |
76d7553f MD |
3982 | ret = close(sock); |
3983 | if (ret) { | |
3984 | PERROR("close"); | |
3985 | } | |
a4b35e07 | 3986 | } |
273ea72c | 3987 | |
5eb91c98 | 3988 | lttng_poll_clean(&events); |
a2fb29a5 | 3989 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3990 | |
3991 | rcu_unregister_thread(); | |
1d4b027a DG |
3992 | return NULL; |
3993 | } | |
3994 | ||
3995 | ||
fac6795d DG |
3996 | /* |
3997 | * usage function on stderr | |
3998 | */ | |
3999 | static void usage(void) | |
4000 | { | |
b716ce68 | 4001 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
4002 | fprintf(stderr, " -h, --help Display this usage.\n"); |
4003 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
4004 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
4005 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
4006 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
4007 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
4008 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
4009 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
4010 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
4011 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
4012 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
4013 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4014 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
4015 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
4016 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
4017 | fprintf(stderr, " -V, --version Show version number.\n"); | |
4018 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
4019 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
4020 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 4021 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4022 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
4023 | } |
4024 | ||
4025 | /* | |
4026 | * daemon argument parsing | |
4027 | */ | |
4028 | static int parse_args(int argc, char **argv) | |
4029 | { | |
4030 | int c; | |
4031 | ||
4032 | static struct option long_options[] = { | |
4033 | { "client-sock", 1, 0, 'c' }, | |
4034 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
4035 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
4036 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
4037 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
4038 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
4039 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
4040 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
4041 | { "consumerd32-path", 1, 0, 'u' }, | |
4042 | { "consumerd32-libdir", 1, 0, 'U' }, | |
4043 | { "consumerd64-path", 1, 0, 't' }, | |
4044 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 4045 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 4046 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
4047 | { "help", 0, 0, 'h' }, |
4048 | { "group", 1, 0, 'g' }, | |
4049 | { "version", 0, 0, 'V' }, | |
75462a81 | 4050 | { "quiet", 0, 0, 'q' }, |
3f9947db | 4051 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 4052 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 4053 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
4054 | { NULL, 0, 0, 0 } |
4055 | }; | |
4056 | ||
4057 | while (1) { | |
4058 | int option_index = 0; | |
4fba7219 | 4059 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 4060 | long_options, &option_index); |
fac6795d DG |
4061 | if (c == -1) { |
4062 | break; | |
4063 | } | |
4064 | ||
4065 | switch (c) { | |
4066 | case 0: | |
4067 | fprintf(stderr, "option %s", long_options[option_index].name); | |
4068 | if (optarg) { | |
4069 | fprintf(stderr, " with arg %s\n", optarg); | |
4070 | } | |
4071 | break; | |
b716ce68 | 4072 | case 'c': |
fac6795d DG |
4073 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
4074 | break; | |
4075 | case 'a': | |
4076 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
4077 | break; | |
4078 | case 'd': | |
4079 | opt_daemon = 1; | |
4080 | break; | |
4081 | case 'g': | |
fb09408a | 4082 | opt_tracing_group = optarg; |
fac6795d DG |
4083 | break; |
4084 | case 'h': | |
4085 | usage(); | |
4086 | exit(EXIT_FAILURE); | |
4087 | case 'V': | |
4088 | fprintf(stdout, "%s\n", VERSION); | |
4089 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
4090 | case 'S': |
4091 | opt_sig_parent = 1; | |
4092 | break; | |
d6f42150 | 4093 | case 'E': |
3bd1e081 | 4094 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
4095 | break; |
4096 | case 'C': | |
3bd1e081 MD |
4097 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4098 | break; | |
4099 | case 'F': | |
7753dea8 | 4100 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4101 | break; |
4102 | case 'D': | |
7753dea8 MD |
4103 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4104 | break; | |
4105 | case 'H': | |
4106 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4107 | break; | |
4108 | case 'G': | |
4109 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4110 | break; |
4fba7219 DG |
4111 | case 'N': |
4112 | opt_no_kernel = 1; | |
4113 | break; | |
75462a81 | 4114 | case 'q': |
97e19046 | 4115 | lttng_opt_quiet = 1; |
75462a81 | 4116 | break; |
3f9947db | 4117 | case 'v': |
53086306 | 4118 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4119 | lttng_opt_verbose += 1; |
3f9947db | 4120 | break; |
31f73cc9 | 4121 | case 'Z': |
3bd1e081 | 4122 | opt_verbose_consumer += 1; |
31f73cc9 | 4123 | break; |
fb09408a | 4124 | case 'u': |
fc7a59ce | 4125 | consumerd32_bin= optarg; |
ebaeda94 MD |
4126 | break; |
4127 | case 'U': | |
4128 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4129 | break; |
4130 | case 't': | |
fc7a59ce | 4131 | consumerd64_bin = optarg; |
ebaeda94 MD |
4132 | break; |
4133 | case 'T': | |
4134 | consumerd64_libdir = optarg; | |
fb09408a | 4135 | break; |
fac6795d DG |
4136 | default: |
4137 | /* Unknown option or other error. | |
4138 | * Error is printed by getopt, just return */ | |
4139 | return -1; | |
4140 | } | |
4141 | } | |
4142 | ||
4143 | return 0; | |
4144 | } | |
4145 | ||
4146 | /* | |
d063d709 | 4147 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4148 | * apps_sock - The communication socket for all UST apps. |
4149 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4150 | */ |
cf3af59e | 4151 | static int init_daemon_socket(void) |
fac6795d DG |
4152 | { |
4153 | int ret = 0; | |
4154 | mode_t old_umask; | |
4155 | ||
4156 | old_umask = umask(0); | |
4157 | ||
4158 | /* Create client tool unix socket */ | |
d6f42150 DG |
4159 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4160 | if (client_sock < 0) { | |
4161 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4162 | ret = -1; |
4163 | goto end; | |
4164 | } | |
4165 | ||
4166 | /* File permission MUST be 660 */ | |
4167 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4168 | if (ret < 0) { | |
d6f42150 | 4169 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4170 | PERROR("chmod"); |
fac6795d DG |
4171 | goto end; |
4172 | } | |
4173 | ||
4174 | /* Create the application unix socket */ | |
d6f42150 DG |
4175 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4176 | if (apps_sock < 0) { | |
4177 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4178 | ret = -1; |
4179 | goto end; | |
4180 | } | |
4181 | ||
d6f42150 | 4182 | /* File permission MUST be 666 */ |
54d01ffb DG |
4183 | ret = chmod(apps_unix_sock_path, |
4184 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4185 | if (ret < 0) { |
d6f42150 | 4186 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4187 | PERROR("chmod"); |
fac6795d DG |
4188 | goto end; |
4189 | } | |
4190 | ||
4191 | end: | |
4192 | umask(old_umask); | |
4193 | return ret; | |
4194 | } | |
4195 | ||
4196 | /* | |
54d01ffb DG |
4197 | * Check if the global socket is available, and if a daemon is answering at the |
4198 | * other side. If yes, error is returned. | |
fac6795d | 4199 | */ |
cf3af59e | 4200 | static int check_existing_daemon(void) |
fac6795d | 4201 | { |
7d8234d9 | 4202 | /* Is there anybody out there ? */ |
099e26bd | 4203 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4204 | return -EEXIST; |
099e26bd | 4205 | } |
b09c7c76 DG |
4206 | |
4207 | return 0; | |
fac6795d DG |
4208 | } |
4209 | ||
fac6795d | 4210 | /* |
d063d709 | 4211 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4212 | * |
d063d709 | 4213 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4214 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4215 | */ |
be040666 | 4216 | static int set_permissions(char *rundir) |
fac6795d DG |
4217 | { |
4218 | int ret; | |
996b65c8 | 4219 | gid_t gid; |
fac6795d | 4220 | |
9fbaebcf DG |
4221 | ret = allowed_group(); |
4222 | if (ret < 0) { | |
be040666 DG |
4223 | WARN("No tracing group detected"); |
4224 | ret = 0; | |
fac6795d DG |
4225 | goto end; |
4226 | } | |
4227 | ||
9fbaebcf DG |
4228 | gid = ret; |
4229 | ||
d6f42150 | 4230 | /* Set lttng run dir */ |
be040666 | 4231 | ret = chown(rundir, 0, gid); |
d6f42150 | 4232 | if (ret < 0) { |
be040666 | 4233 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4234 | PERROR("chown"); |
d6f42150 DG |
4235 | } |
4236 | ||
d1613cf5 | 4237 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4238 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4239 | if (ret < 0) { |
4240 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4241 | PERROR("chmod"); |
d1613cf5 JN |
4242 | } |
4243 | ||
d6f42150 | 4244 | /* lttng client socket path */ |
996b65c8 | 4245 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4246 | if (ret < 0) { |
d6f42150 | 4247 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4248 | PERROR("chown"); |
d6f42150 DG |
4249 | } |
4250 | ||
3bd1e081 MD |
4251 | /* kconsumer error socket path */ |
4252 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4253 | if (ret < 0) { |
3bd1e081 | 4254 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4255 | PERROR("chown"); |
3bd1e081 MD |
4256 | } |
4257 | ||
7753dea8 MD |
4258 | /* 64-bit ustconsumer error socket path */ |
4259 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4260 | if (ret < 0) { | |
4261 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4262 | PERROR("chown"); |
7753dea8 MD |
4263 | } |
4264 | ||
4265 | /* 32-bit ustconsumer compat32 error socket path */ | |
4266 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4267 | if (ret < 0) { |
7753dea8 | 4268 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4269 | PERROR("chown"); |
fac6795d DG |
4270 | } |
4271 | ||
d6f42150 | 4272 | DBG("All permissions are set"); |
e07ae692 | 4273 | |
fac6795d DG |
4274 | end: |
4275 | return ret; | |
4276 | } | |
4277 | ||
7a485870 | 4278 | /* |
d063d709 | 4279 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4280 | * Closed in cleanup(). |
7a485870 DG |
4281 | */ |
4282 | static int create_kernel_poll_pipe(void) | |
4283 | { | |
730389d9 DG |
4284 | int ret, i; |
4285 | ||
4286 | ret = pipe(kernel_poll_pipe); | |
4287 | if (ret < 0) { | |
4288 | PERROR("kernel poll pipe"); | |
4289 | goto error; | |
4290 | } | |
4291 | ||
4292 | for (i = 0; i < 2; i++) { | |
4293 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4294 | if (ret < 0) { | |
4295 | PERROR("fcntl kernel_poll_pipe"); | |
4296 | goto error; | |
4297 | } | |
4298 | } | |
4299 | ||
4300 | error: | |
4301 | return ret; | |
7a485870 DG |
4302 | } |
4303 | ||
099e26bd DG |
4304 | /* |
4305 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4306 | * Closed in cleanup(). |
099e26bd DG |
4307 | */ |
4308 | static int create_apps_cmd_pipe(void) | |
4309 | { | |
730389d9 DG |
4310 | int ret, i; |
4311 | ||
4312 | ret = pipe(apps_cmd_pipe); | |
4313 | if (ret < 0) { | |
4314 | PERROR("apps cmd pipe"); | |
4315 | goto error; | |
4316 | } | |
4317 | ||
4318 | for (i = 0; i < 2; i++) { | |
4319 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4320 | if (ret < 0) { | |
4321 | PERROR("fcntl apps_cmd_pipe"); | |
4322 | goto error; | |
4323 | } | |
4324 | } | |
4325 | ||
4326 | error: | |
4327 | return ret; | |
099e26bd DG |
4328 | } |
4329 | ||
d6f42150 | 4330 | /* |
d063d709 | 4331 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4332 | */ |
67e40797 | 4333 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4334 | { |
4335 | int ret; | |
4336 | ||
67e40797 DG |
4337 | DBG3("Creating LTTng run directory: %s", rundir); |
4338 | ||
d1613cf5 | 4339 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4340 | if (ret < 0) { |
b1f11e69 | 4341 | if (errno != EEXIST) { |
67e40797 | 4342 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4343 | goto error; |
4344 | } else { | |
4345 | ret = 0; | |
4346 | } | |
d6f42150 DG |
4347 | } |
4348 | ||
4349 | error: | |
4350 | return ret; | |
4351 | } | |
4352 | ||
4353 | /* | |
d063d709 DG |
4354 | * Setup sockets and directory needed by the kconsumerd communication with the |
4355 | * session daemon. | |
d6f42150 | 4356 | */ |
67e40797 DG |
4357 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4358 | const char *rundir) | |
d6f42150 DG |
4359 | { |
4360 | int ret; | |
67e40797 | 4361 | char path[PATH_MAX]; |
d6f42150 | 4362 | |
67e40797 | 4363 | switch (consumer_data->type) { |
7753dea8 | 4364 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4365 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4366 | break; |
4367 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4368 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4369 | break; |
4370 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4371 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4372 | break; |
4373 | default: | |
4374 | ERR("Consumer type unknown"); | |
4375 | ret = -EINVAL; | |
4376 | goto error; | |
d6f42150 DG |
4377 | } |
4378 | ||
67e40797 DG |
4379 | DBG2("Creating consumer directory: %s", path); |
4380 | ||
d1613cf5 | 4381 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4382 | if (ret < 0) { |
6beb2242 | 4383 | if (errno != EEXIST) { |
f11e84c2 | 4384 | PERROR("mkdir"); |
3bd1e081 | 4385 | ERR("Failed to create %s", path); |
6beb2242 DG |
4386 | goto error; |
4387 | } | |
f11e84c2 | 4388 | ret = -1; |
d6f42150 DG |
4389 | } |
4390 | ||
4391 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4392 | consumer_data->err_sock = |
4393 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4394 | if (consumer_data->err_sock < 0) { | |
4395 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4396 | ret = -1; |
4397 | goto error; | |
4398 | } | |
4399 | ||
4400 | /* File permission MUST be 660 */ | |
3bd1e081 | 4401 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4402 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4403 | if (ret < 0) { |
3bd1e081 | 4404 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4405 | PERROR("chmod"); |
d6f42150 DG |
4406 | goto error; |
4407 | } | |
4408 | ||
4409 | error: | |
4410 | return ret; | |
4411 | } | |
4412 | ||
fac6795d | 4413 | /* |
d063d709 | 4414 | * Signal handler for the daemon |
cf3af59e | 4415 | * |
54d01ffb DG |
4416 | * Simply stop all worker threads, leaving main() return gracefully after |
4417 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4418 | */ |
4419 | static void sighandler(int sig) | |
4420 | { | |
4421 | switch (sig) { | |
cf3af59e | 4422 | case SIGPIPE: |
af87c45a | 4423 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4424 | return; |
4425 | case SIGINT: | |
af87c45a | 4426 | DBG("SIGINT caught"); |
cf3af59e MD |
4427 | stop_threads(); |
4428 | break; | |
4429 | case SIGTERM: | |
af87c45a | 4430 | DBG("SIGTERM caught"); |
cf3af59e MD |
4431 | stop_threads(); |
4432 | break; | |
4433 | default: | |
4434 | break; | |
fac6795d | 4435 | } |
fac6795d DG |
4436 | } |
4437 | ||
4438 | /* | |
d063d709 | 4439 | * Setup signal handler for : |
1d4b027a | 4440 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4441 | */ |
1d4b027a | 4442 | static int set_signal_handler(void) |
fac6795d | 4443 | { |
1d4b027a DG |
4444 | int ret = 0; |
4445 | struct sigaction sa; | |
4446 | sigset_t sigset; | |
fac6795d | 4447 | |
1d4b027a | 4448 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4449 | PERROR("sigemptyset"); |
1d4b027a DG |
4450 | return ret; |
4451 | } | |
d6f42150 | 4452 | |
1d4b027a DG |
4453 | sa.sa_handler = sighandler; |
4454 | sa.sa_mask = sigset; | |
4455 | sa.sa_flags = 0; | |
4456 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4457 | PERROR("sigaction"); |
1d4b027a | 4458 | return ret; |
d6f42150 DG |
4459 | } |
4460 | ||
1d4b027a | 4461 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4462 | PERROR("sigaction"); |
1d4b027a | 4463 | return ret; |
d6f42150 | 4464 | } |
aaf26714 | 4465 | |
1d4b027a | 4466 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4467 | PERROR("sigaction"); |
1d4b027a | 4468 | return ret; |
8c0faa1d DG |
4469 | } |
4470 | ||
1d4b027a DG |
4471 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4472 | ||
4473 | return ret; | |
fac6795d DG |
4474 | } |
4475 | ||
f3ed775e | 4476 | /* |
d063d709 DG |
4477 | * Set open files limit to unlimited. This daemon can open a large number of |
4478 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4479 | */ |
4480 | static void set_ulimit(void) | |
4481 | { | |
4482 | int ret; | |
4483 | struct rlimit lim; | |
4484 | ||
a88df331 | 4485 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4486 | lim.rlim_cur = 65535; |
4487 | lim.rlim_max = 65535; | |
4488 | ||
4489 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4490 | if (ret < 0) { | |
76d7553f | 4491 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4492 | } |
4493 | } | |
4494 | ||
fac6795d DG |
4495 | /* |
4496 | * main | |
4497 | */ | |
4498 | int main(int argc, char **argv) | |
4499 | { | |
fac6795d DG |
4500 | int ret = 0; |
4501 | void *status; | |
b082db07 | 4502 | const char *home_path; |
fac6795d | 4503 | |
335a95b7 MD |
4504 | init_kernel_workarounds(); |
4505 | ||
f6a9efaa DG |
4506 | rcu_register_thread(); |
4507 | ||
7753dea8 | 4508 | setup_consumerd_path(); |
fb09408a | 4509 | |
fac6795d DG |
4510 | /* Parse arguments */ |
4511 | progname = argv[0]; | |
4512 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4513 | goto error; |
fac6795d DG |
4514 | } |
4515 | ||
4516 | /* Daemonize */ | |
4517 | if (opt_daemon) { | |
a360b16d MD |
4518 | int i; |
4519 | ||
4520 | /* | |
4521 | * fork | |
4522 | * child: setsid, close FD 0, 1, 2, chdir / | |
4523 | * parent: exit (if fork is successful) | |
4524 | */ | |
53094c05 DG |
4525 | ret = daemon(0, 0); |
4526 | if (ret < 0) { | |
76d7553f | 4527 | PERROR("daemon"); |
cf3af59e | 4528 | goto error; |
53094c05 | 4529 | } |
a360b16d MD |
4530 | /* |
4531 | * We are in the child. Make sure all other file | |
4532 | * descriptors are closed, in case we are called with | |
4533 | * more opened file descriptors than the standard ones. | |
4534 | */ | |
4535 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4536 | (void) close(i); | |
4537 | } | |
4538 | } | |
4539 | ||
4540 | /* Create thread quit pipe */ | |
4541 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4542 | goto error; | |
fac6795d DG |
4543 | } |
4544 | ||
4545 | /* Check if daemon is UID = 0 */ | |
4546 | is_root = !getuid(); | |
4547 | ||
fac6795d | 4548 | if (is_root) { |
990570ed | 4549 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4550 | |
4551 | /* Create global run dir with root access */ | |
4552 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4553 | if (ret < 0) { |
cf3af59e | 4554 | goto error; |
d6f42150 DG |
4555 | } |
4556 | ||
fac6795d | 4557 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4558 | snprintf(apps_unix_sock_path, PATH_MAX, |
4559 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4560 | } |
4561 | ||
4562 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4563 | snprintf(client_unix_sock_path, PATH_MAX, |
4564 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4565 | } | |
0fdd1e2c DG |
4566 | |
4567 | /* Set global SHM for ust */ | |
4568 | if (strlen(wait_shm_path) == 0) { | |
4569 | snprintf(wait_shm_path, PATH_MAX, | |
4570 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4571 | } | |
67e40797 DG |
4572 | |
4573 | /* Setup kernel consumerd path */ | |
4574 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4575 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4576 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4577 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4578 | |
4579 | DBG2("Kernel consumer err path: %s", | |
4580 | kconsumer_data.err_unix_sock_path); | |
4581 | DBG2("Kernel consumer cmd path: %s", | |
4582 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4583 | } else { |
b082db07 DG |
4584 | home_path = get_home_dir(); |
4585 | if (home_path == NULL) { | |
273ea72c DG |
4586 | /* TODO: Add --socket PATH option */ |
4587 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4588 | ret = -EPERM; |
4589 | goto error; | |
b082db07 DG |
4590 | } |
4591 | ||
67e40797 DG |
4592 | /* |
4593 | * Create rundir from home path. This will create something like | |
4594 | * $HOME/.lttng | |
4595 | */ | |
990570ed | 4596 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4597 | if (ret < 0) { |
4598 | ret = -ENOMEM; | |
4599 | goto error; | |
4600 | } | |
4601 | ||
4602 | ret = create_lttng_rundir(rundir); | |
4603 | if (ret < 0) { | |
4604 | goto error; | |
4605 | } | |
4606 | ||
fac6795d | 4607 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4608 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4609 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4610 | } |
4611 | ||
4612 | /* Set the cli tool unix socket path */ | |
4613 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4614 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4615 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4616 | } |
0fdd1e2c DG |
4617 | |
4618 | /* Set global SHM for ust */ | |
4619 | if (strlen(wait_shm_path) == 0) { | |
4620 | snprintf(wait_shm_path, PATH_MAX, | |
4621 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4622 | } | |
fac6795d DG |
4623 | } |
4624 | ||
f22d70f0 DG |
4625 | /* Set consumer initial state */ |
4626 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4627 | ust_consumerd_state = CONSUMER_STOPPED; | |
4628 | ||
847177cd DG |
4629 | DBG("Client socket path %s", client_unix_sock_path); |
4630 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4631 | DBG("LTTng run directory path: %s", rundir); |
4632 | ||
4633 | /* 32 bits consumerd path setup */ | |
4634 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4635 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4636 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4637 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4638 | |
4639 | DBG2("UST consumer 32 bits err path: %s", | |
4640 | ustconsumer32_data.err_unix_sock_path); | |
4641 | DBG2("UST consumer 32 bits cmd path: %s", | |
4642 | ustconsumer32_data.cmd_unix_sock_path); | |
4643 | ||
4644 | /* 64 bits consumerd path setup */ | |
4645 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4646 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4647 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4648 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4649 | |
4650 | DBG2("UST consumer 64 bits err path: %s", | |
4651 | ustconsumer64_data.err_unix_sock_path); | |
4652 | DBG2("UST consumer 64 bits cmd path: %s", | |
4653 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4654 | |
273ea72c | 4655 | /* |
7d8234d9 | 4656 | * See if daemon already exist. |
fac6795d | 4657 | */ |
7d8234d9 | 4658 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4659 | ERR("Already running daemon.\n"); |
273ea72c | 4660 | /* |
cf3af59e MD |
4661 | * We do not goto exit because we must not cleanup() |
4662 | * because a daemon is already running. | |
ab118b20 | 4663 | */ |
cf3af59e | 4664 | goto error; |
a88df331 DG |
4665 | } |
4666 | ||
1427f9b2 DG |
4667 | /* |
4668 | * Init UST app hash table. Alloc hash table before this point since | |
4669 | * cleanup() can get called after that point. | |
4670 | */ | |
4671 | ust_app_ht_alloc(); | |
4672 | ||
54d01ffb | 4673 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4674 | |
4675 | /* | |
4676 | * These actions must be executed as root. We do that *after* setting up | |
4677 | * the sockets path because we MUST make the check for another daemon using | |
4678 | * those paths *before* trying to set the kernel consumer sockets and init | |
4679 | * kernel tracer. | |
4680 | */ | |
4681 | if (is_root) { | |
67e40797 | 4682 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4683 | if (ret < 0) { |
4684 | goto exit; | |
4685 | } | |
4686 | ||
a88df331 | 4687 | /* Setup kernel tracer */ |
4fba7219 DG |
4688 | if (!opt_no_kernel) { |
4689 | init_kernel_tracer(); | |
4690 | } | |
a88df331 DG |
4691 | |
4692 | /* Set ulimit for open files */ | |
4693 | set_ulimit(); | |
fac6795d | 4694 | } |
4063050c MD |
4695 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4696 | lttng_fd_init(); | |
fac6795d | 4697 | |
67e40797 DG |
4698 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4699 | if (ret < 0) { | |
4700 | goto exit; | |
4701 | } | |
4702 | ||
4703 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4704 | if (ret < 0) { | |
4705 | goto exit; | |
4706 | } | |
4707 | ||
cf3af59e MD |
4708 | if ((ret = set_signal_handler()) < 0) { |
4709 | goto exit; | |
fac6795d DG |
4710 | } |
4711 | ||
d6f42150 | 4712 | /* Setup the needed unix socket */ |
cf3af59e MD |
4713 | if ((ret = init_daemon_socket()) < 0) { |
4714 | goto exit; | |
fac6795d DG |
4715 | } |
4716 | ||
4717 | /* Set credentials to socket */ | |
be040666 | 4718 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4719 | goto exit; |
fac6795d DG |
4720 | } |
4721 | ||
5b8719f5 DG |
4722 | /* Get parent pid if -S, --sig-parent is specified. */ |
4723 | if (opt_sig_parent) { | |
4724 | ppid = getppid(); | |
4725 | } | |
4726 | ||
7a485870 | 4727 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4728 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4729 | goto exit; | |
7a485870 DG |
4730 | } |
4731 | ||
099e26bd DG |
4732 | /* Setup the thread apps communication pipe. */ |
4733 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4734 | goto exit; | |
4735 | } | |
4736 | ||
4737 | /* Init UST command queue. */ | |
4738 | cds_wfq_init(&ust_cmd_queue.queue); | |
4739 | ||
273ea72c | 4740 | /* |
54d01ffb DG |
4741 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4742 | * statically declared in session.c | |
273ea72c | 4743 | */ |
54d01ffb | 4744 | session_list_ptr = session_get_list(); |
b5541356 | 4745 | |
5eb91c98 DG |
4746 | /* Set up max poll set size */ |
4747 | lttng_poll_set_max_size(); | |
4748 | ||
cf3af59e | 4749 | /* Create thread to manage the client socket */ |
099e26bd DG |
4750 | ret = pthread_create(&client_thread, NULL, |
4751 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4752 | if (ret != 0) { |
76d7553f | 4753 | PERROR("pthread_create clients"); |
cf3af59e MD |
4754 | goto exit_client; |
4755 | } | |
fac6795d | 4756 | |
099e26bd DG |
4757 | /* Create thread to dispatch registration */ |
4758 | ret = pthread_create(&dispatch_thread, NULL, | |
4759 | thread_dispatch_ust_registration, (void *) NULL); | |
4760 | if (ret != 0) { | |
76d7553f | 4761 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4762 | goto exit_dispatch; |
4763 | } | |
4764 | ||
4765 | /* Create thread to manage application registration. */ | |
4766 | ret = pthread_create(®_apps_thread, NULL, | |
4767 | thread_registration_apps, (void *) NULL); | |
4768 | if (ret != 0) { | |
76d7553f | 4769 | PERROR("pthread_create registration"); |
099e26bd DG |
4770 | goto exit_reg_apps; |
4771 | } | |
4772 | ||
cf3af59e | 4773 | /* Create thread to manage application socket */ |
54d01ffb DG |
4774 | ret = pthread_create(&apps_thread, NULL, |
4775 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4776 | if (ret != 0) { |
76d7553f | 4777 | PERROR("pthread_create apps"); |
cf3af59e MD |
4778 | goto exit_apps; |
4779 | } | |
fac6795d | 4780 | |
cf3af59e | 4781 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4782 | ret = pthread_create(&kernel_thread, NULL, |
4783 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4784 | if (ret != 0) { |
76d7553f | 4785 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4786 | goto exit_kernel; |
4787 | } | |
7a485870 | 4788 | |
cf3af59e MD |
4789 | ret = pthread_join(kernel_thread, &status); |
4790 | if (ret != 0) { | |
76d7553f | 4791 | PERROR("pthread_join"); |
cf3af59e | 4792 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4793 | } |
4794 | ||
cf3af59e MD |
4795 | exit_kernel: |
4796 | ret = pthread_join(apps_thread, &status); | |
4797 | if (ret != 0) { | |
76d7553f | 4798 | PERROR("pthread_join"); |
cf3af59e MD |
4799 | goto error; /* join error, exit without cleanup */ |
4800 | } | |
fac6795d | 4801 | |
cf3af59e | 4802 | exit_apps: |
099e26bd DG |
4803 | ret = pthread_join(reg_apps_thread, &status); |
4804 | if (ret != 0) { | |
76d7553f | 4805 | PERROR("pthread_join"); |
099e26bd DG |
4806 | goto error; /* join error, exit without cleanup */ |
4807 | } | |
4808 | ||
4809 | exit_reg_apps: | |
4810 | ret = pthread_join(dispatch_thread, &status); | |
4811 | if (ret != 0) { | |
76d7553f | 4812 | PERROR("pthread_join"); |
099e26bd DG |
4813 | goto error; /* join error, exit without cleanup */ |
4814 | } | |
4815 | ||
4816 | exit_dispatch: | |
cf3af59e MD |
4817 | ret = pthread_join(client_thread, &status); |
4818 | if (ret != 0) { | |
76d7553f | 4819 | PERROR("pthread_join"); |
cf3af59e MD |
4820 | goto error; /* join error, exit without cleanup */ |
4821 | } | |
4822 | ||
3bd1e081 | 4823 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4824 | if (ret != 0) { |
76d7553f | 4825 | PERROR("join_consumer"); |
cf3af59e MD |
4826 | goto error; /* join error, exit without cleanup */ |
4827 | } | |
a88df331 | 4828 | |
cf3af59e | 4829 | exit_client: |
a88df331 | 4830 | exit: |
cf3af59e MD |
4831 | /* |
4832 | * cleanup() is called when no other thread is running. | |
4833 | */ | |
f6a9efaa | 4834 | rcu_thread_online(); |
cf3af59e | 4835 | cleanup(); |
f6a9efaa DG |
4836 | rcu_thread_offline(); |
4837 | rcu_unregister_thread(); | |
67e40797 | 4838 | if (!ret) { |
cf3af59e | 4839 | exit(EXIT_SUCCESS); |
67e40797 | 4840 | } |
cf3af59e | 4841 | error: |
5e16da05 | 4842 | exit(EXIT_FAILURE); |
fac6795d | 4843 | } |