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> | |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
54d01ffb | 48 | #include "channel.h" |
b579acd9 | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
4771f025 | 52 | #include "kernel.h" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
4063050c | 57 | #include "fd-limit.h" |
fac6795d | 58 | |
ebaeda94 MD |
59 | #define CONSUMERD_FILE "lttng-consumerd" |
60 | ||
3bd1e081 MD |
61 | struct consumer_data { |
62 | enum lttng_consumer_type type; | |
63 | ||
64 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
65 | sem_t sem; | |
66 | ||
67 | /* Mutex to control consumerd pid assignation */ | |
68 | pthread_mutex_t pid_mutex; | |
69 | pid_t pid; | |
70 | ||
71 | int err_sock; | |
72 | int cmd_sock; | |
73 | ||
74 | /* consumer error and command Unix socket path */ | |
75 | char err_unix_sock_path[PATH_MAX]; | |
76 | char cmd_unix_sock_path[PATH_MAX]; | |
77 | }; | |
fac6795d | 78 | |
b25a8868 DG |
79 | #include "benchmark.h" |
80 | ||
75462a81 | 81 | /* Const values */ |
686204ab | 82 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 83 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
84 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
85 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
86 | ||
fac6795d DG |
87 | const char *progname; |
88 | const char *opt_tracing_group; | |
5b8719f5 | 89 | static int opt_sig_parent; |
97e19046 | 90 | static int opt_verbose_consumer; |
fac6795d | 91 | static int opt_daemon; |
4fba7219 | 92 | static int opt_no_kernel; |
fac6795d | 93 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 95 | static char *rundir; |
3bd1e081 MD |
96 | |
97 | /* Consumer daemon specific control data */ | |
98 | static struct consumer_data kconsumer_data = { | |
99 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
100 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
101 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
102 | .err_sock = -1, |
103 | .cmd_sock = -1, | |
3bd1e081 | 104 | }; |
7753dea8 MD |
105 | static struct consumer_data ustconsumer64_data = { |
106 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
107 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
108 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
109 | .err_sock = -1, |
110 | .cmd_sock = -1, | |
3bd1e081 | 111 | }; |
7753dea8 MD |
112 | static struct consumer_data ustconsumer32_data = { |
113 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
114 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
115 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
116 | .err_sock = -1, |
117 | .cmd_sock = -1, | |
3bd1e081 MD |
118 | }; |
119 | ||
099e26bd | 120 | static int dispatch_thread_exit; |
fac6795d | 121 | |
54d01ffb DG |
122 | /* Global application Unix socket path */ |
123 | static char apps_unix_sock_path[PATH_MAX]; | |
124 | /* Global client Unix socket path */ | |
125 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
126 | /* global wait shm path for UST */ |
127 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 128 | |
1d4b027a | 129 | /* Sockets and FDs */ |
a4b35e07 MD |
130 | static int client_sock = -1; |
131 | static int apps_sock = -1; | |
132 | static int kernel_tracer_fd = -1; | |
76d7553f | 133 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 134 | |
273ea72c DG |
135 | /* |
136 | * Quit pipe for all threads. This permits a single cancellation point | |
137 | * for all threads when receiving an event on the pipe. | |
138 | */ | |
76d7553f | 139 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 140 | |
099e26bd DG |
141 | /* |
142 | * This pipe is used to inform the thread managing application communication | |
143 | * that a command is queued and ready to be processed. | |
144 | */ | |
76d7553f | 145 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 146 | |
1d4b027a | 147 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 148 | static pthread_t apps_thread; |
099e26bd | 149 | static pthread_t reg_apps_thread; |
1d4b027a | 150 | static pthread_t client_thread; |
7a485870 | 151 | static pthread_t kernel_thread; |
099e26bd | 152 | static pthread_t dispatch_thread; |
5eb91c98 | 153 | |
fac6795d | 154 | |
099e26bd DG |
155 | /* |
156 | * UST registration command queue. This queue is tied with a futex and uses a N | |
157 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
158 | * | |
159 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
160 | * this queue and the wait/wake scheme. | |
161 | */ | |
162 | static struct ust_cmd_queue ust_cmd_queue; | |
163 | ||
b5541356 DG |
164 | /* |
165 | * Pointer initialized before thread creation. | |
166 | * | |
167 | * This points to the tracing session list containing the session count and a | |
168 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
169 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 170 | * |
d063d709 | 171 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 172 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
173 | */ |
174 | static struct ltt_session_list *session_list_ptr; | |
175 | ||
7753dea8 MD |
176 | int ust_consumerd64_fd = -1; |
177 | int ust_consumerd32_fd = -1; | |
178 | ||
fb6f1fa2 YB |
179 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
180 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
181 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
182 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
183 | |
184 | static | |
7753dea8 | 185 | void setup_consumerd_path(void) |
fb09408a | 186 | { |
fc7a59ce | 187 | const char *bin, *libdir; |
fb09408a | 188 | |
7753dea8 MD |
189 | /* |
190 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
191 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
192 | * has not been defined. | |
7753dea8 | 193 | */ |
ebaeda94 | 194 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
195 | if (!consumerd32_bin[0]) { |
196 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
197 | } |
198 | if (!consumerd32_libdir[0]) { | |
199 | consumerd32_libdir = INSTALL_LIB_PATH; | |
200 | } | |
201 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
202 | if (!consumerd64_bin[0]) { |
203 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 204 | } |
ebaeda94 MD |
205 | if (!consumerd64_libdir[0]) { |
206 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
207 | } |
208 | #else | |
209 | #error "Unknown bitness" | |
210 | #endif | |
211 | ||
fb09408a MD |
212 | /* |
213 | * runtime env. var. overrides the build default. | |
214 | */ | |
fc7a59ce AM |
215 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
216 | if (bin) { | |
217 | consumerd32_bin = bin; | |
7753dea8 | 218 | } |
fc7a59ce AM |
219 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
220 | if (bin) { | |
221 | consumerd64_bin = bin; | |
ebaeda94 | 222 | } |
72f579ee | 223 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
224 | if (libdir) { |
225 | consumerd32_libdir = libdir; | |
226 | } | |
72f579ee | 227 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
228 | if (libdir) { |
229 | consumerd64_libdir = libdir; | |
fb09408a MD |
230 | } |
231 | } | |
232 | ||
5eb91c98 DG |
233 | /* |
234 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
235 | */ | |
236 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
237 | unsigned int size) | |
238 | { | |
239 | int ret; | |
240 | ||
241 | if (events == NULL || size == 0) { | |
242 | ret = -1; | |
243 | goto error; | |
244 | } | |
245 | ||
246 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
247 | if (ret < 0) { | |
248 | goto error; | |
249 | } | |
250 | ||
251 | /* Add quit pipe */ | |
252 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
253 | if (ret < 0) { | |
254 | goto error; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | ||
259 | error: | |
260 | return ret; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Check if the thread quit pipe was triggered. | |
265 | * | |
266 | * Return 1 if it was triggered else 0; | |
267 | */ | |
268 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
269 | { | |
270 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
271 | return 1; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
0fdd1e2c DG |
277 | /* |
278 | * Return group ID of the tracing group or -1 if not found. | |
279 | */ | |
996b65c8 MD |
280 | static gid_t allowed_group(void) |
281 | { | |
282 | struct group *grp; | |
283 | ||
274e143b MD |
284 | if (opt_tracing_group) { |
285 | grp = getgrnam(opt_tracing_group); | |
286 | } else { | |
287 | grp = getgrnam(default_tracing_group); | |
288 | } | |
996b65c8 MD |
289 | if (!grp) { |
290 | return -1; | |
291 | } else { | |
292 | return grp->gr_gid; | |
293 | } | |
294 | } | |
295 | ||
273ea72c | 296 | /* |
5eb91c98 | 297 | * Init thread quit pipe. |
273ea72c DG |
298 | * |
299 | * Return -1 on error or 0 if all pipes are created. | |
300 | */ | |
301 | static int init_thread_quit_pipe(void) | |
302 | { | |
730389d9 | 303 | int ret, i; |
273ea72c | 304 | |
730389d9 | 305 | ret = pipe(thread_quit_pipe); |
273ea72c | 306 | if (ret < 0) { |
730389d9 | 307 | PERROR("thread quit pipe"); |
273ea72c DG |
308 | goto error; |
309 | } | |
310 | ||
730389d9 DG |
311 | for (i = 0; i < 2; i++) { |
312 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
313 | if (ret < 0) { | |
314 | PERROR("fcntl"); | |
315 | goto error; | |
316 | } | |
317 | } | |
318 | ||
273ea72c DG |
319 | error: |
320 | return ret; | |
321 | } | |
322 | ||
fac6795d | 323 | /* |
d063d709 DG |
324 | * Complete teardown of a kernel session. This free all data structure related |
325 | * to a kernel session and update counter. | |
fac6795d | 326 | */ |
1d4b027a | 327 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 328 | { |
8f7a84dd | 329 | if (!session->kernel_session) { |
99bab54f | 330 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 331 | return; |
8f7a84dd | 332 | } |
d9800920 | 333 | |
84ea9c99 | 334 | DBG("Tearing down kernel session"); |
d9800920 | 335 | |
84ea9c99 MD |
336 | /* |
337 | * If a custom kernel consumer was registered, close the socket before | |
338 | * tearing down the complete kernel session structure | |
339 | */ | |
03550b58 MD |
340 | if (kconsumer_data.cmd_sock >= 0 && |
341 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 342 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 343 | } |
84ea9c99 MD |
344 | |
345 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
346 | } |
347 | ||
f6a9efaa DG |
348 | /* |
349 | * Complete teardown of all UST sessions. This will free everything on his path | |
350 | * and destroy the core essence of all ust sessions :) | |
351 | */ | |
352 | static void teardown_ust_session(struct ltt_session *session) | |
353 | { | |
84cd17c6 MD |
354 | int ret; |
355 | ||
8f7a84dd | 356 | if (!session->ust_session) { |
99bab54f | 357 | DBG3("No UST session when tearing down session"); |
f470a390 | 358 | return; |
8f7a84dd DG |
359 | } |
360 | ||
f6a9efaa DG |
361 | DBG("Tearing down UST session(s)"); |
362 | ||
84cd17c6 MD |
363 | ret = ust_app_destroy_trace_all(session->ust_session); |
364 | if (ret) { | |
365 | ERR("Error in ust_app_destroy_trace_all"); | |
366 | } | |
8f7a84dd | 367 | |
f6a9efaa DG |
368 | trace_ust_destroy_session(session->ust_session); |
369 | } | |
370 | ||
099e26bd DG |
371 | /* |
372 | * Stop all threads by closing the thread quit pipe. | |
373 | */ | |
cf3af59e MD |
374 | static void stop_threads(void) |
375 | { | |
5eb91c98 DG |
376 | int ret; |
377 | ||
cf3af59e MD |
378 | /* Stopping all threads */ |
379 | DBG("Terminating all threads"); | |
54d01ffb | 380 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
381 | if (ret < 0) { |
382 | ERR("write error on thread quit pipe"); | |
383 | } | |
384 | ||
099e26bd DG |
385 | /* Dispatch thread */ |
386 | dispatch_thread_exit = 1; | |
387 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
388 | } |
389 | ||
fac6795d | 390 | /* |
d063d709 | 391 | * Cleanup the daemon |
fac6795d | 392 | */ |
cf3af59e | 393 | static void cleanup(void) |
fac6795d | 394 | { |
76d7553f | 395 | int ret, i; |
1d4b027a | 396 | char *cmd; |
af9737e9 | 397 | struct ltt_session *sess, *stmp; |
fac6795d | 398 | |
1d4b027a | 399 | DBG("Cleaning up"); |
e07ae692 | 400 | |
67e40797 DG |
401 | DBG("Removing %s directory", rundir); |
402 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
403 | if (ret < 0) { | |
404 | ERR("asprintf failed. Something is really wrong!"); | |
405 | } | |
5461b305 | 406 | |
67e40797 DG |
407 | /* Remove lttng run directory */ |
408 | ret = system(cmd); | |
409 | if (ret < 0) { | |
410 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 411 | } |
67e40797 | 412 | free(cmd); |
5461b305 | 413 | |
99bab54f | 414 | DBG("Cleaning up all sessions"); |
fac6795d | 415 | |
b5541356 | 416 | /* Destroy session list mutex */ |
273ea72c DG |
417 | if (session_list_ptr != NULL) { |
418 | pthread_mutex_destroy(&session_list_ptr->lock); | |
419 | ||
420 | /* Cleanup ALL session */ | |
54d01ffb DG |
421 | cds_list_for_each_entry_safe(sess, stmp, |
422 | &session_list_ptr->head, list) { | |
273ea72c | 423 | teardown_kernel_session(sess); |
f6a9efaa DG |
424 | teardown_ust_session(sess); |
425 | free(sess); | |
273ea72c DG |
426 | } |
427 | } | |
428 | ||
099e26bd | 429 | DBG("Closing all UST sockets"); |
56fff090 | 430 | ust_app_clean_list(); |
099e26bd | 431 | |
3bd1e081 | 432 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 433 | |
4fba7219 DG |
434 | if (is_root && !opt_no_kernel) { |
435 | DBG2("Closing kernel fd"); | |
a4b35e07 | 436 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
437 | ret = close(kernel_tracer_fd); |
438 | if (ret) { | |
439 | PERROR("close"); | |
440 | } | |
a4b35e07 | 441 | } |
2f50c8a3 | 442 | DBG("Unloading kernel modules"); |
096102bd | 443 | modprobe_remove_lttng_all(); |
2f50c8a3 | 444 | } |
b25a8868 | 445 | |
76d7553f MD |
446 | /* |
447 | * Closing all pipes used for communication between threads. | |
448 | */ | |
449 | for (i = 0; i < 2; i++) { | |
450 | if (kernel_poll_pipe[i] >= 0) { | |
451 | ret = close(kernel_poll_pipe[i]); | |
452 | if (ret) { | |
453 | PERROR("close"); | |
454 | } | |
902c9922 | 455 | |
76d7553f MD |
456 | } |
457 | } | |
458 | for (i = 0; i < 2; i++) { | |
459 | if (thread_quit_pipe[i] >= 0) { | |
460 | ret = close(thread_quit_pipe[i]); | |
461 | if (ret) { | |
462 | PERROR("close"); | |
463 | } | |
464 | } | |
465 | } | |
466 | for (i = 0; i < 2; i++) { | |
467 | if (apps_cmd_pipe[i] >= 0) { | |
468 | ret = close(apps_cmd_pipe[i]); | |
469 | if (ret) { | |
470 | PERROR("close"); | |
471 | } | |
472 | } | |
473 | } | |
dab4c8a1 | 474 | |
3c6bae61 | 475 | /* OUTPUT BENCHMARK RESULTS */ |
902c9922 | 476 | //bench_init(); |
3c6bae61 | 477 | |
62d53818 DG |
478 | if (getenv("BENCH_UST_NOTIFY")) { |
479 | bench_print_ust_notification(); | |
480 | } | |
481 | ||
482 | if (getenv("BENCH_UST_REGISTER")) { | |
483 | bench_print_ust_register(); | |
ccca3fea | 484 | bench_print_ust_unregister(); |
62d53818 DG |
485 | } |
486 | ||
487 | if (getenv("BENCH_BOOT_PROCESS")) { | |
488 | bench_print_boot_process(); | |
489 | } | |
3c6bae61 | 490 | |
902c9922 DG |
491 | if (getenv("BENCH_COMMANDS")) { |
492 | bench_print_enable_ust_event(); | |
493 | } | |
494 | ||
3c6bae61 DG |
495 | bench_close(); |
496 | /* END BENCHMARK */ | |
bb3037a9 | 497 | |
421cb601 | 498 | /* <fun> */ |
f56a39af | 499 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
500 | "Matthew, BEET driven development works!%c[%dm", |
501 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
502 | /* </fun> */ | |
fac6795d DG |
503 | } |
504 | ||
e065084a | 505 | /* |
d063d709 | 506 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 507 | * |
d063d709 | 508 | * Return lttcomm error code. |
e065084a DG |
509 | */ |
510 | static int send_unix_sock(int sock, void *buf, size_t len) | |
511 | { | |
512 | /* Check valid length */ | |
513 | if (len <= 0) { | |
514 | return -1; | |
515 | } | |
516 | ||
517 | return lttcomm_send_unix_sock(sock, buf, len); | |
518 | } | |
519 | ||
5461b305 | 520 | /* |
d063d709 | 521 | * Free memory of a command context structure. |
5461b305 | 522 | */ |
a2fb29a5 | 523 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 524 | { |
a2fb29a5 DG |
525 | DBG("Clean command context structure"); |
526 | if (*cmd_ctx) { | |
527 | if ((*cmd_ctx)->llm) { | |
528 | free((*cmd_ctx)->llm); | |
5461b305 | 529 | } |
a2fb29a5 DG |
530 | if ((*cmd_ctx)->lsm) { |
531 | free((*cmd_ctx)->lsm); | |
5461b305 | 532 | } |
a2fb29a5 DG |
533 | free(*cmd_ctx); |
534 | *cmd_ctx = NULL; | |
5461b305 DG |
535 | } |
536 | } | |
537 | ||
f3ed775e | 538 | /* |
d063d709 | 539 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 540 | */ |
2bdd86d4 | 541 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
542 | int sock, struct ltt_kernel_channel *channel, |
543 | uid_t uid, gid_t gid) | |
f3ed775e DG |
544 | { |
545 | int ret; | |
f3ed775e | 546 | struct ltt_kernel_stream *stream; |
3bd1e081 | 547 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 548 | |
3bd1e081 | 549 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 550 | channel->channel->name); |
7a485870 | 551 | |
3bd1e081 MD |
552 | /* Send channel */ |
553 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
554 | lkm.u.channel.channel_key = channel->fd; | |
555 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
556 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 557 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 558 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 559 | if (ret < 0) { |
76d7553f | 560 | PERROR("send consumer channel"); |
f3ed775e DG |
561 | goto error; |
562 | } | |
563 | ||
3bd1e081 | 564 | /* Send streams */ |
7a485870 | 565 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
566 | if (!stream->fd) { |
567 | continue; | |
568 | } | |
569 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
570 | lkm.u.stream.channel_key = channel->fd; | |
571 | lkm.u.stream.stream_key = stream->fd; | |
572 | lkm.u.stream.state = stream->state; | |
573 | lkm.u.stream.output = channel->channel->attr.output; | |
574 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
575 | lkm.u.stream.uid = uid; |
576 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
577 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
578 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
579 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
580 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
581 | if (ret < 0) { | |
76d7553f | 582 | PERROR("send consumer stream"); |
3bd1e081 MD |
583 | goto error; |
584 | } | |
585 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
586 | if (ret < 0) { | |
76d7553f | 587 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 588 | goto error; |
f3ed775e DG |
589 | } |
590 | } | |
591 | ||
3bd1e081 | 592 | DBG("consumer channel streams sent"); |
f3ed775e DG |
593 | |
594 | return 0; | |
595 | ||
596 | error: | |
597 | return ret; | |
598 | } | |
599 | ||
600 | /* | |
d063d709 | 601 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 602 | */ |
2bdd86d4 | 603 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 604 | struct ltt_kernel_session *session) |
f3ed775e DG |
605 | { |
606 | int ret; | |
607 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
608 | struct lttcomm_consumer_msg lkm; |
609 | int sock = session->consumer_fd; | |
7a485870 DG |
610 | |
611 | DBG("Sending metadata stream fd"); | |
612 | ||
03550b58 MD |
613 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
614 | if (session->consumer_fd < 0) { | |
3bd1e081 | 615 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
616 | } |
617 | ||
03550b58 | 618 | if (session->metadata_stream_fd >= 0) { |
3bd1e081 MD |
619 | /* Send metadata channel fd */ |
620 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
621 | lkm.u.channel.channel_key = session->metadata->fd; | |
622 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
623 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
032b44f0 | 624 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 MD |
625 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
626 | if (ret < 0) { | |
76d7553f | 627 | PERROR("send consumer channel"); |
3bd1e081 MD |
628 | goto error; |
629 | } | |
630 | ||
631 | /* Send metadata stream fd */ | |
632 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
633 | lkm.u.stream.channel_key = session->metadata->fd; | |
634 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
635 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
636 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
637 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
638 | lkm.u.stream.uid = session->uid; |
639 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
640 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
641 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
642 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
643 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
7a485870 | 644 | if (ret < 0) { |
76d7553f | 645 | PERROR("send consumer stream"); |
3bd1e081 MD |
646 | goto error; |
647 | } | |
648 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 649 | if (ret < 0) { |
76d7553f | 650 | PERROR("send consumer stream"); |
7a485870 DG |
651 | goto error; |
652 | } | |
653 | } | |
f3ed775e | 654 | |
f3ed775e | 655 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
656 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
657 | session->uid, session->gid); | |
f3ed775e | 658 | if (ret < 0) { |
7a485870 | 659 | goto error; |
f3ed775e DG |
660 | } |
661 | } | |
662 | ||
2bdd86d4 | 663 | DBG("consumer fds (metadata and channel streams) sent"); |
7a485870 | 664 | |
f3ed775e DG |
665 | return 0; |
666 | ||
667 | error: | |
668 | return ret; | |
669 | } | |
670 | ||
fac6795d | 671 | /* |
0fdd1e2c | 672 | * Notify UST applications using the shm mmap futex. |
fac6795d | 673 | */ |
0fdd1e2c | 674 | static int notify_ust_apps(int active) |
fac6795d | 675 | { |
0fdd1e2c | 676 | char *wait_shm_mmap; |
fac6795d | 677 | |
0fdd1e2c | 678 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 679 | |
0fdd1e2c DG |
680 | /* See shm.c for this call implying mmap, shm and futex calls */ |
681 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
682 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
683 | goto error; |
684 | } | |
685 | ||
44749e83 DG |
686 | tracepoint(ust_notify_apps_start); |
687 | ||
0fdd1e2c DG |
688 | /* Wake waiting process */ |
689 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
690 | ||
62d53818 DG |
691 | tracepoint(ust_notify_apps_stop); |
692 | ||
0fdd1e2c DG |
693 | /* Apps notified successfully */ |
694 | return 0; | |
fac6795d DG |
695 | |
696 | error: | |
0fdd1e2c | 697 | return -1; |
fac6795d DG |
698 | } |
699 | ||
e065084a | 700 | /* |
d063d709 DG |
701 | * Setup the outgoing data buffer for the response (llm) by allocating the |
702 | * right amount of memory and copying the original information from the lsm | |
703 | * structure. | |
ca95a216 | 704 | * |
d063d709 | 705 | * Return total size of the buffer pointed by buf. |
ca95a216 | 706 | */ |
5461b305 | 707 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 708 | { |
f3ed775e | 709 | int ret, buf_size; |
ca95a216 | 710 | |
f3ed775e | 711 | buf_size = size; |
5461b305 | 712 | |
ba7f0ae5 | 713 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 714 | if (cmd_ctx->llm == NULL) { |
76d7553f | 715 | PERROR("zmalloc"); |
5461b305 | 716 | ret = -ENOMEM; |
ca95a216 DG |
717 | goto error; |
718 | } | |
719 | ||
5461b305 DG |
720 | /* Copy common data */ |
721 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 722 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 723 | |
5461b305 DG |
724 | cmd_ctx->llm->data_size = size; |
725 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
726 | ||
ca95a216 DG |
727 | return buf_size; |
728 | ||
729 | error: | |
730 | return ret; | |
731 | } | |
732 | ||
7a485870 | 733 | /* |
5eb91c98 | 734 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 735 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 736 | */ |
5eb91c98 | 737 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 738 | { |
5eb91c98 | 739 | int ret; |
7a485870 DG |
740 | struct ltt_session *session; |
741 | struct ltt_kernel_channel *channel; | |
742 | ||
5eb91c98 | 743 | DBG("Updating kernel poll set"); |
7a485870 | 744 | |
54d01ffb | 745 | session_lock_list(); |
b5541356 | 746 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 747 | session_lock(session); |
7a485870 | 748 | if (session->kernel_session == NULL) { |
54d01ffb | 749 | session_unlock(session); |
7a485870 DG |
750 | continue; |
751 | } | |
7a485870 | 752 | |
54d01ffb DG |
753 | cds_list_for_each_entry(channel, |
754 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
755 | /* Add channel fd to the kernel poll set */ |
756 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
757 | if (ret < 0) { | |
54d01ffb | 758 | session_unlock(session); |
5eb91c98 DG |
759 | goto error; |
760 | } | |
761 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 762 | } |
54d01ffb | 763 | session_unlock(session); |
7a485870 | 764 | } |
54d01ffb | 765 | session_unlock_list(); |
7a485870 | 766 | |
5eb91c98 | 767 | return 0; |
7a485870 DG |
768 | |
769 | error: | |
54d01ffb | 770 | session_unlock_list(); |
7a485870 DG |
771 | return -1; |
772 | } | |
773 | ||
774 | /* | |
54d01ffb | 775 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 776 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 777 | * |
d063d709 | 778 | * Useful for CPU hotplug feature. |
7a485870 | 779 | */ |
2bdd86d4 | 780 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
781 | { |
782 | int ret = 0; | |
783 | struct ltt_session *session; | |
784 | struct ltt_kernel_channel *channel; | |
785 | ||
786 | DBG("Updating kernel streams for channel fd %d", fd); | |
787 | ||
54d01ffb | 788 | session_lock_list(); |
b5541356 | 789 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 790 | session_lock(session); |
7a485870 | 791 | if (session->kernel_session == NULL) { |
54d01ffb | 792 | session_unlock(session); |
7a485870 DG |
793 | continue; |
794 | } | |
d9800920 | 795 | |
03550b58 MD |
796 | /* This is not suppose to be -1 but this is an extra security check */ |
797 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 798 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
799 | } |
800 | ||
5eb91c98 DG |
801 | cds_list_for_each_entry(channel, |
802 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
803 | if (channel->fd == fd) { |
804 | DBG("Channel found, updating kernel streams"); | |
805 | ret = kernel_open_channel_stream(channel); | |
806 | if (ret < 0) { | |
b3c750d2 | 807 | goto error; |
7a485870 | 808 | } |
d9800920 | 809 | |
7a485870 | 810 | /* |
5eb91c98 DG |
811 | * Have we already sent fds to the consumer? If yes, it means |
812 | * that tracing is started so it is safe to send our updated | |
813 | * stream fds. | |
7a485870 | 814 | */ |
3bd1e081 | 815 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 816 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
817 | session->kernel_session->consumer_fd, channel, |
818 | session->uid, session->gid); | |
7a485870 | 819 | if (ret < 0) { |
b3c750d2 | 820 | goto error; |
7a485870 DG |
821 | } |
822 | } | |
b3c750d2 | 823 | goto error; |
7a485870 DG |
824 | } |
825 | } | |
54d01ffb | 826 | session_unlock(session); |
7a485870 | 827 | } |
54d01ffb | 828 | session_unlock_list(); |
b3c750d2 | 829 | return ret; |
7a485870 | 830 | |
b3c750d2 | 831 | error: |
54d01ffb DG |
832 | session_unlock(session); |
833 | session_unlock_list(); | |
7a485870 DG |
834 | return ret; |
835 | } | |
836 | ||
487cf67c DG |
837 | /* |
838 | * For each tracing session, update newly registered apps. | |
839 | */ | |
840 | static void update_ust_app(int app_sock) | |
841 | { | |
842 | struct ltt_session *sess, *stmp; | |
843 | ||
4ee14516 DG |
844 | session_lock_list(); |
845 | ||
487cf67c DG |
846 | /* For all tracing session(s) */ |
847 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 848 | session_lock(sess); |
421cb601 DG |
849 | if (sess->ust_session) { |
850 | ust_app_global_update(sess->ust_session, app_sock); | |
851 | } | |
4ee14516 | 852 | session_unlock(sess); |
487cf67c | 853 | } |
4ee14516 DG |
854 | |
855 | session_unlock_list(); | |
487cf67c DG |
856 | } |
857 | ||
7a485870 | 858 | /* |
d063d709 | 859 | * This thread manage event coming from the kernel. |
7a485870 | 860 | * |
d063d709 DG |
861 | * Features supported in this thread: |
862 | * -) CPU Hotplug | |
7a485870 DG |
863 | */ |
864 | static void *thread_manage_kernel(void *data) | |
865 | { | |
5eb91c98 DG |
866 | int ret, i, pollfd, update_poll_flag = 1; |
867 | uint32_t revents, nb_fd; | |
7a485870 | 868 | char tmp; |
5eb91c98 | 869 | struct lttng_poll_event events; |
7a485870 | 870 | |
b25a8868 DG |
871 | tracepoint(sessiond_th_kern_start); |
872 | ||
7a485870 DG |
873 | DBG("Thread manage kernel started"); |
874 | ||
5eb91c98 DG |
875 | ret = create_thread_poll_set(&events, 2); |
876 | if (ret < 0) { | |
76d7553f | 877 | goto error_poll_create; |
5eb91c98 DG |
878 | } |
879 | ||
880 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
881 | if (ret < 0) { | |
882 | goto error; | |
883 | } | |
884 | ||
7a485870 DG |
885 | while (1) { |
886 | if (update_poll_flag == 1) { | |
5f822d0a DG |
887 | /* |
888 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
889 | * quit pipe and the kernel pipe. | |
890 | */ | |
891 | events.nb_fd = 2; | |
892 | ||
5eb91c98 DG |
893 | ret = update_kernel_poll(&events); |
894 | if (ret < 0) { | |
7a485870 DG |
895 | goto error; |
896 | } | |
897 | update_poll_flag = 0; | |
898 | } | |
899 | ||
5eb91c98 DG |
900 | nb_fd = LTTNG_POLL_GETNB(&events); |
901 | ||
902 | DBG("Thread kernel polling on %d fds", nb_fd); | |
903 | ||
904 | /* Zeroed the poll events */ | |
905 | lttng_poll_reset(&events); | |
7a485870 | 906 | |
b25a8868 DG |
907 | tracepoint(sessiond_th_kern_poll); |
908 | ||
7a485870 | 909 | /* Poll infinite value of time */ |
88f2b785 | 910 | restart: |
5eb91c98 | 911 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 912 | if (ret < 0) { |
88f2b785 MD |
913 | /* |
914 | * Restart interrupted system call. | |
915 | */ | |
916 | if (errno == EINTR) { | |
917 | goto restart; | |
918 | } | |
7a485870 DG |
919 | goto error; |
920 | } else if (ret == 0) { | |
921 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
922 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
923 | "This should not have happened! Continuing..."); | |
7a485870 DG |
924 | continue; |
925 | } | |
926 | ||
5eb91c98 DG |
927 | for (i = 0; i < nb_fd; i++) { |
928 | /* Fetch once the poll data */ | |
929 | revents = LTTNG_POLL_GETEV(&events, i); | |
930 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 931 | |
5eb91c98 DG |
932 | /* Thread quit pipe has been closed. Killing thread. */ |
933 | ret = check_thread_quit_pipe(pollfd, revents); | |
934 | if (ret) { | |
935 | goto error; | |
936 | } | |
7a485870 | 937 | |
5eb91c98 DG |
938 | /* Check for data on kernel pipe */ |
939 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
940 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
941 | update_poll_flag = 1; | |
942 | continue; | |
943 | } else { | |
944 | /* | |
945 | * New CPU detected by the kernel. Adding kernel stream to | |
946 | * kernel session and updating the kernel consumer | |
947 | */ | |
948 | if (revents & LPOLLIN) { | |
2bdd86d4 | 949 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
950 | if (ret < 0) { |
951 | continue; | |
952 | } | |
953 | break; | |
954 | /* | |
955 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
956 | * and unregister kernel stream at this point. | |
957 | */ | |
7a485870 | 958 | } |
7a485870 DG |
959 | } |
960 | } | |
961 | } | |
962 | ||
963 | error: | |
5eb91c98 | 964 | lttng_poll_clean(&events); |
76d7553f MD |
965 | error_poll_create: |
966 | DBG("Kernel thread dying"); | |
7a485870 DG |
967 | return NULL; |
968 | } | |
969 | ||
1d4b027a | 970 | /* |
3bd1e081 | 971 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 972 | */ |
3bd1e081 | 973 | static void *thread_manage_consumer(void *data) |
1d4b027a | 974 | { |
76d7553f | 975 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 976 | uint32_t revents, nb_fd; |
1d4b027a | 977 | enum lttcomm_return_code code; |
5eb91c98 | 978 | struct lttng_poll_event events; |
3bd1e081 | 979 | struct consumer_data *consumer_data = data; |
1d4b027a | 980 | |
b25a8868 DG |
981 | tracepoint(sessiond_th_kcon_start); |
982 | ||
3bd1e081 | 983 | DBG("[thread] Manage consumer started"); |
1d4b027a | 984 | |
3bd1e081 | 985 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 986 | if (ret < 0) { |
76d7553f | 987 | goto error_listen; |
1d4b027a DG |
988 | } |
989 | ||
5eb91c98 DG |
990 | /* |
991 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
992 | * Nothing more will be added to this poll set. | |
993 | */ | |
994 | ret = create_thread_poll_set(&events, 2); | |
995 | if (ret < 0) { | |
76d7553f | 996 | goto error_poll; |
5eb91c98 | 997 | } |
273ea72c | 998 | |
3bd1e081 | 999 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1000 | if (ret < 0) { |
1001 | goto error; | |
1002 | } | |
273ea72c | 1003 | |
5eb91c98 | 1004 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 1005 | |
b25a8868 DG |
1006 | tracepoint(sessiond_th_kcon_poll); |
1007 | ||
273ea72c | 1008 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1009 | restart: |
5eb91c98 | 1010 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1011 | if (ret < 0) { |
88f2b785 MD |
1012 | /* |
1013 | * Restart interrupted system call. | |
1014 | */ | |
1015 | if (errno == EINTR) { | |
1016 | goto restart; | |
1017 | } | |
273ea72c DG |
1018 | goto error; |
1019 | } | |
1020 | ||
5eb91c98 DG |
1021 | for (i = 0; i < nb_fd; i++) { |
1022 | /* Fetch once the poll data */ | |
1023 | revents = LTTNG_POLL_GETEV(&events, i); | |
1024 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1025 | ||
1026 | /* Thread quit pipe has been closed. Killing thread. */ | |
1027 | ret = check_thread_quit_pipe(pollfd, revents); | |
1028 | if (ret) { | |
1029 | goto error; | |
1030 | } | |
1031 | ||
1032 | /* Event on the registration socket */ | |
3bd1e081 | 1033 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1034 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1035 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1036 | goto error; |
1037 | } | |
1038 | } | |
273ea72c DG |
1039 | } |
1040 | ||
3bd1e081 | 1041 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1042 | if (sock < 0) { |
1043 | goto error; | |
1044 | } | |
1045 | ||
3bd1e081 | 1046 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1047 | |
712ea556 | 1048 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1049 | ret = lttcomm_recv_unix_sock(sock, &code, |
1050 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1051 | if (ret <= 0) { |
1052 | goto error; | |
1053 | } | |
1054 | ||
3bd1e081 MD |
1055 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1056 | consumer_data->cmd_sock = | |
1057 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1058 | if (consumer_data->cmd_sock < 0) { | |
1059 | sem_post(&consumer_data->sem); | |
48842b30 | 1060 | PERROR("consumer connect"); |
1d4b027a DG |
1061 | goto error; |
1062 | } | |
1063 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1064 | sem_post(&consumer_data->sem); |
1065 | DBG("consumer command socket ready"); | |
1d4b027a | 1066 | } else { |
3bd1e081 | 1067 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1068 | lttcomm_get_readable_code(-code)); |
1069 | goto error; | |
1070 | } | |
1071 | ||
54d01ffb | 1072 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1073 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1074 | if (ret < 0) { |
72079cae DG |
1075 | goto error; |
1076 | } | |
1077 | ||
5eb91c98 DG |
1078 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1079 | if (ret < 0) { | |
72079cae | 1080 | goto error; |
5eb91c98 DG |
1081 | } |
1082 | ||
1083 | /* Update number of fd */ | |
1084 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1085 | ||
1086 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1087 | restart_poll: |
5eb91c98 DG |
1088 | ret = lttng_poll_wait(&events, -1); |
1089 | if (ret < 0) { | |
88f2b785 MD |
1090 | /* |
1091 | * Restart interrupted system call. | |
1092 | */ | |
1093 | if (errno == EINTR) { | |
1094 | goto restart_poll; | |
1095 | } | |
72079cae DG |
1096 | goto error; |
1097 | } | |
1098 | ||
5eb91c98 DG |
1099 | for (i = 0; i < nb_fd; i++) { |
1100 | /* Fetch once the poll data */ | |
1101 | revents = LTTNG_POLL_GETEV(&events, i); | |
1102 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1103 | ||
1104 | /* Thread quit pipe has been closed. Killing thread. */ | |
1105 | ret = check_thread_quit_pipe(pollfd, revents); | |
1106 | if (ret) { | |
1107 | goto error; | |
1108 | } | |
1109 | ||
1110 | /* Event on the kconsumerd socket */ | |
1111 | if (pollfd == sock) { | |
1112 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1113 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1114 | goto error; |
1115 | } | |
1116 | } | |
1117 | } | |
1118 | ||
712ea556 | 1119 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1120 | ret = lttcomm_recv_unix_sock(sock, &code, |
1121 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1122 | if (ret <= 0) { |
3bd1e081 | 1123 | ERR("consumer closed the command socket"); |
712ea556 | 1124 | goto error; |
6f61d021 | 1125 | } |
1d4b027a | 1126 | |
3bd1e081 | 1127 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1128 | |
1d4b027a | 1129 | error: |
76d7553f MD |
1130 | if (consumer_data->err_sock >= 0) { |
1131 | ret = close(consumer_data->err_sock); | |
1132 | if (ret) { | |
1133 | PERROR("close"); | |
1134 | } | |
1135 | } | |
1136 | if (consumer_data->cmd_sock >= 0) { | |
1137 | ret = close(consumer_data->cmd_sock); | |
1138 | if (ret) { | |
1139 | PERROR("close"); | |
1140 | } | |
1141 | } | |
1142 | if (sock >= 0) { | |
1143 | ret = close(sock); | |
1144 | if (ret) { | |
1145 | PERROR("close"); | |
1146 | } | |
1147 | } | |
273ea72c | 1148 | |
3bd1e081 MD |
1149 | unlink(consumer_data->err_unix_sock_path); |
1150 | unlink(consumer_data->cmd_unix_sock_path); | |
1151 | consumer_data->pid = 0; | |
0177d773 | 1152 | |
5eb91c98 | 1153 | lttng_poll_clean(&events); |
76d7553f MD |
1154 | error_poll: |
1155 | error_listen: | |
1156 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1157 | |
5eb91c98 | 1158 | return NULL; |
099e26bd DG |
1159 | } |
1160 | ||
099e26bd DG |
1161 | /* |
1162 | * This thread manage application communication. | |
1d4b027a DG |
1163 | */ |
1164 | static void *thread_manage_apps(void *data) | |
099e26bd | 1165 | { |
5eb91c98 DG |
1166 | int i, ret, pollfd; |
1167 | uint32_t revents, nb_fd; | |
099e26bd | 1168 | struct ust_command ust_cmd; |
5eb91c98 | 1169 | struct lttng_poll_event events; |
099e26bd | 1170 | |
85c434ee DG |
1171 | tracepoint(sessiond_th_apps_start); |
1172 | ||
099e26bd DG |
1173 | DBG("[thread] Manage application started"); |
1174 | ||
f6a9efaa DG |
1175 | rcu_register_thread(); |
1176 | rcu_thread_online(); | |
1177 | ||
5eb91c98 DG |
1178 | ret = create_thread_poll_set(&events, 2); |
1179 | if (ret < 0) { | |
76d7553f | 1180 | goto error_poll_create; |
5eb91c98 | 1181 | } |
099e26bd | 1182 | |
5eb91c98 DG |
1183 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1184 | if (ret < 0) { | |
1185 | goto error; | |
1186 | } | |
099e26bd | 1187 | |
5eb91c98 DG |
1188 | while (1) { |
1189 | /* Zeroed the events structure */ | |
1190 | lttng_poll_reset(&events); | |
0177d773 | 1191 | |
5eb91c98 | 1192 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1193 | |
1194 | DBG("Apps thread polling on %d fds", nb_fd); | |
1195 | ||
85c434ee DG |
1196 | tracepoint(sessiond_th_apps_poll); |
1197 | ||
099e26bd | 1198 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1199 | restart: |
5eb91c98 | 1200 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1201 | if (ret < 0) { |
88f2b785 MD |
1202 | /* |
1203 | * Restart interrupted system call. | |
1204 | */ | |
1205 | if (errno == EINTR) { | |
1206 | goto restart; | |
1207 | } | |
099e26bd DG |
1208 | goto error; |
1209 | } | |
1210 | ||
5eb91c98 DG |
1211 | for (i = 0; i < nb_fd; i++) { |
1212 | /* Fetch once the poll data */ | |
1213 | revents = LTTNG_POLL_GETEV(&events, i); | |
1214 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1215 | ||
1216 | /* Thread quit pipe has been closed. Killing thread. */ | |
1217 | ret = check_thread_quit_pipe(pollfd, revents); | |
1218 | if (ret) { | |
099e26bd | 1219 | goto error; |
5eb91c98 | 1220 | } |
62d53818 | 1221 | |
5eb91c98 DG |
1222 | /* Inspect the apps cmd pipe */ |
1223 | if (pollfd == apps_cmd_pipe[0]) { | |
1224 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1225 | ERR("Apps command pipe error"); | |
0177d773 | 1226 | goto error; |
5eb91c98 | 1227 | } else if (revents & LPOLLIN) { |
44749e83 | 1228 | system("sysctl vm.drop_caches=3"); |
dab4c8a1 | 1229 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1230 | /* Empty pipe */ |
1231 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1232 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1233 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1234 | goto error; |
1235 | } | |
a89c7d1b | 1236 | tracepoint(ust_register_read_stop); |
099e26bd | 1237 | |
a89c7d1b | 1238 | tracepoint(ust_register_add_start); |
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 | 1246 | } |
a89c7d1b | 1247 | tracepoint(ust_register_add_stop); |
85c434ee | 1248 | |
acc7b41b | 1249 | /* |
e0c7ec2b | 1250 | * Validate UST version compatibility. |
acc7b41b | 1251 | */ |
e0c7ec2b DG |
1252 | ret = ust_app_validate_version(ust_cmd.sock); |
1253 | if (ret >= 0) { | |
1254 | /* | |
1255 | * Add channel(s) and event(s) to newly registered apps | |
1256 | * from lttng global UST domain. | |
1257 | */ | |
1258 | update_ust_app(ust_cmd.sock); | |
1259 | } | |
acc7b41b | 1260 | |
44749e83 | 1261 | tracepoint(ust_register_done_start); |
f2ca2e25 | 1262 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1263 | if (ret < 0) { |
1264 | /* | |
1265 | * If the registration is not possible, we simply | |
1266 | * unregister the apps and continue | |
1267 | */ | |
56fff090 | 1268 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 | 1269 | } else { |
44749e83 | 1270 | tracepoint(ust_register_done_stop); |
5eb91c98 DG |
1271 | /* |
1272 | * We just need here to monitor the close of the UST | |
1273 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1274 | * Listen on POLLIN (even if we never expect any |
1275 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1276 | */ |
a9ade966 | 1277 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1278 | if (ret < 0) { |
1279 | goto error; | |
1280 | } | |
1281 | ||
54d01ffb DG |
1282 | DBG("Apps with sock %d added to poll set", |
1283 | ust_cmd.sock); | |
5eb91c98 DG |
1284 | } |
1285 | break; | |
0177d773 | 1286 | } |
5eb91c98 DG |
1287 | } else { |
1288 | /* | |
54d01ffb DG |
1289 | * At this point, we know that a registered application made |
1290 | * the event at poll_wait. | |
5eb91c98 DG |
1291 | */ |
1292 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
aa231298 DG |
1293 | tracepoint(ust_unregister_start); |
1294 | ||
5eb91c98 DG |
1295 | /* Removing from the poll set */ |
1296 | ret = lttng_poll_del(&events, pollfd); | |
1297 | if (ret < 0) { | |
1298 | goto error; | |
1299 | } | |
099e26bd | 1300 | |
b9d9b220 | 1301 | /* Socket closed on remote end. */ |
56fff090 | 1302 | ust_app_unregister(pollfd); |
aa231298 DG |
1303 | |
1304 | tracepoint(ust_unregister_stop); | |
5eb91c98 | 1305 | break; |
0177d773 | 1306 | } |
099e26bd DG |
1307 | } |
1308 | } | |
099e26bd DG |
1309 | } |
1310 | ||
1311 | error: | |
5eb91c98 | 1312 | lttng_poll_clean(&events); |
76d7553f MD |
1313 | error_poll_create: |
1314 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1315 | rcu_thread_offline(); |
1316 | rcu_unregister_thread(); | |
099e26bd DG |
1317 | return NULL; |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Dispatch request from the registration threads to the application | |
1322 | * communication thread. | |
1323 | */ | |
1324 | static void *thread_dispatch_ust_registration(void *data) | |
1325 | { | |
1326 | int ret; | |
1327 | struct cds_wfq_node *node; | |
1328 | struct ust_command *ust_cmd = NULL; | |
1329 | ||
85c434ee DG |
1330 | tracepoint(sessiond_th_dispatch_start); |
1331 | ||
099e26bd DG |
1332 | DBG("[thread] Dispatch UST command started"); |
1333 | ||
1334 | while (!dispatch_thread_exit) { | |
1335 | /* Atomically prepare the queue futex */ | |
1336 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1337 | ||
1338 | do { | |
85c434ee DG |
1339 | tracepoint(sessiond_th_dispatch_block); |
1340 | ||
099e26bd DG |
1341 | /* Dequeue command for registration */ |
1342 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1343 | if (node == NULL) { | |
00a17c97 | 1344 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1345 | /* Continue thread execution */ |
1346 | break; | |
1347 | } | |
1348 | ||
62d53818 DG |
1349 | tracepoint(ust_dispatch_register_start); |
1350 | ||
099e26bd DG |
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 | ||
62d53818 DG |
1381 | tracepoint(ust_dispatch_register_stop); |
1382 | ||
099e26bd DG |
1383 | /* Futex wait on queue. Blocking call on futex() */ |
1384 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1385 | } | |
1386 | ||
1387 | error: | |
1388 | DBG("Dispatch thread dying"); | |
1389 | return NULL; | |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * This thread manage application registration. | |
1394 | */ | |
1395 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1396 | { |
a4b35e07 | 1397 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1398 | uint32_t revents, nb_fd; |
1399 | struct lttng_poll_event events; | |
099e26bd DG |
1400 | /* |
1401 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1402 | * freed in the manage apps thread. | |
1403 | */ | |
1404 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1405 | |
62d53818 | 1406 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1407 | |
099e26bd | 1408 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1409 | |
1410 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1411 | if (ret < 0) { | |
76d7553f | 1412 | goto error_listen; |
1d4b027a DG |
1413 | } |
1414 | ||
5eb91c98 DG |
1415 | /* |
1416 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1417 | * more will be added to this poll set. | |
1418 | */ | |
1419 | ret = create_thread_poll_set(&events, 2); | |
1420 | if (ret < 0) { | |
76d7553f | 1421 | goto error_create_poll; |
5eb91c98 | 1422 | } |
273ea72c | 1423 | |
5eb91c98 DG |
1424 | /* Add the application registration socket */ |
1425 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1426 | if (ret < 0) { | |
76d7553f | 1427 | goto error_poll_add; |
5eb91c98 | 1428 | } |
273ea72c | 1429 | |
1d4b027a | 1430 | /* Notify all applications to register */ |
0fdd1e2c DG |
1431 | ret = notify_ust_apps(1); |
1432 | if (ret < 0) { | |
1433 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1434 | "Execution continues but there might be problem for already\n" |
1435 | "running applications that wishes to register."); | |
0fdd1e2c | 1436 | } |
1d4b027a DG |
1437 | |
1438 | while (1) { | |
1439 | DBG("Accepting application registration"); | |
273ea72c | 1440 | |
62d53818 | 1441 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1442 | |
5eb91c98 DG |
1443 | nb_fd = LTTNG_POLL_GETNB(&events); |
1444 | ||
273ea72c | 1445 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1446 | restart: |
5eb91c98 | 1447 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1448 | if (ret < 0) { |
88f2b785 MD |
1449 | /* |
1450 | * Restart interrupted system call. | |
1451 | */ | |
1452 | if (errno == EINTR) { | |
1453 | goto restart; | |
1454 | } | |
273ea72c DG |
1455 | goto error; |
1456 | } | |
1457 | ||
5eb91c98 DG |
1458 | for (i = 0; i < nb_fd; i++) { |
1459 | /* Fetch once the poll data */ | |
1460 | revents = LTTNG_POLL_GETEV(&events, i); | |
1461 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1462 | |
5eb91c98 DG |
1463 | /* Thread quit pipe has been closed. Killing thread. */ |
1464 | ret = check_thread_quit_pipe(pollfd, revents); | |
1465 | if (ret) { | |
90014c57 DG |
1466 | goto error; |
1467 | } | |
62d53818 | 1468 | |
5eb91c98 DG |
1469 | /* Event on the registration socket */ |
1470 | if (pollfd == apps_sock) { | |
1471 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1472 | ERR("Register apps socket poll error"); | |
1473 | goto error; | |
1474 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1475 | /* Registration starts here. Recording cycles */ |
1476 | tracepoint(ust_register_start); | |
1d4b027a | 1477 | |
5eb91c98 DG |
1478 | sock = lttcomm_accept_unix_sock(apps_sock); |
1479 | if (sock < 0) { | |
1480 | goto error; | |
1481 | } | |
099e26bd | 1482 | |
5eb91c98 | 1483 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1484 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1485 | if (ust_cmd == NULL) { |
76d7553f | 1486 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1487 | goto error; |
1488 | } | |
1d4b027a | 1489 | |
5eb91c98 DG |
1490 | /* |
1491 | * Using message-based transmissions to ensure we don't | |
1492 | * have to deal with partially received messages. | |
1493 | */ | |
4063050c MD |
1494 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1495 | if (ret < 0) { | |
1496 | ERR("Exhausted file descriptors allowed for applications."); | |
1497 | free(ust_cmd); | |
1498 | ret = close(sock); | |
1499 | if (ret) { | |
1500 | PERROR("close"); | |
1501 | } | |
1502 | sock = -1; | |
1503 | continue; | |
1504 | } | |
5eb91c98 DG |
1505 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1506 | sizeof(struct ust_register_msg)); | |
1507 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1508 | if (ret < 0) { | |
76d7553f | 1509 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1510 | } else { |
1511 | ERR("Wrong size received on apps register"); | |
1512 | } | |
1513 | free(ust_cmd); | |
76d7553f MD |
1514 | ret = close(sock); |
1515 | if (ret) { | |
1516 | PERROR("close"); | |
1517 | } | |
4063050c | 1518 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1519 | sock = -1; |
5eb91c98 DG |
1520 | continue; |
1521 | } | |
099e26bd | 1522 | |
5eb91c98 | 1523 | ust_cmd->sock = sock; |
34a2494f | 1524 | sock = -1; |
099e26bd | 1525 | |
5eb91c98 DG |
1526 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1527 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1528 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1529 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1530 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1531 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1532 | |
5eb91c98 DG |
1533 | /* |
1534 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1535 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1536 | */ |
1537 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1538 | |
5eb91c98 DG |
1539 | /* |
1540 | * Wake the registration queue futex. Implicit memory | |
1541 | * barrier with the exchange in cds_wfq_enqueue. | |
1542 | */ | |
1543 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1544 | |
1545 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1546 | } |
1547 | } | |
90014c57 | 1548 | } |
1d4b027a DG |
1549 | } |
1550 | ||
1551 | error: | |
0fdd1e2c DG |
1552 | /* Notify that the registration thread is gone */ |
1553 | notify_ust_apps(0); | |
1554 | ||
a4b35e07 | 1555 | if (apps_sock >= 0) { |
76d7553f MD |
1556 | ret = close(apps_sock); |
1557 | if (ret) { | |
1558 | PERROR("close"); | |
1559 | } | |
a4b35e07 | 1560 | } |
46c3f085 | 1561 | if (sock >= 0) { |
76d7553f MD |
1562 | ret = close(sock); |
1563 | if (ret) { | |
1564 | PERROR("close"); | |
1565 | } | |
4063050c | 1566 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1567 | } |
273ea72c | 1568 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1569 | |
76d7553f | 1570 | error_poll_add: |
5eb91c98 | 1571 | lttng_poll_clean(&events); |
76d7553f MD |
1572 | error_listen: |
1573 | error_create_poll: | |
1574 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1575 | |
1d4b027a DG |
1576 | return NULL; |
1577 | } | |
1578 | ||
8c0faa1d | 1579 | /* |
3bd1e081 | 1580 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1581 | * exec or it will fails. |
8c0faa1d | 1582 | */ |
3bd1e081 | 1583 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1584 | { |
1585 | int ret; | |
ee0b0061 DG |
1586 | struct timespec timeout; |
1587 | ||
1588 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1589 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1590 | |
1591 | /* Setup semaphore */ | |
3bd1e081 | 1592 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1593 | if (ret < 0) { |
3bd1e081 | 1594 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1595 | goto error; |
1596 | } | |
8c0faa1d | 1597 | |
3bd1e081 MD |
1598 | ret = pthread_create(&consumer_data->thread, NULL, |
1599 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1600 | if (ret != 0) { |
3bd1e081 | 1601 | PERROR("pthread_create consumer"); |
ee0b0061 | 1602 | ret = -1; |
8c0faa1d DG |
1603 | goto error; |
1604 | } | |
1605 | ||
ee0b0061 DG |
1606 | /* Get time for sem_timedwait absolute timeout */ |
1607 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1608 | if (ret < 0) { | |
3bd1e081 | 1609 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1610 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1611 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1612 | } else { |
1613 | /* Normal timeout if the gettime was successful */ | |
1614 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1615 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1616 | } |
8c0faa1d | 1617 | |
ee0b0061 DG |
1618 | if (ret < 0) { |
1619 | if (errno == ETIMEDOUT) { | |
1620 | /* | |
1621 | * Call has timed out so we kill the kconsumerd_thread and return | |
1622 | * an error. | |
1623 | */ | |
3bd1e081 MD |
1624 | ERR("The consumer thread was never ready. Killing it"); |
1625 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1626 | if (ret < 0) { |
3bd1e081 | 1627 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1628 | } |
1629 | } else { | |
3bd1e081 | 1630 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1631 | } |
1632 | goto error; | |
1633 | } | |
1634 | ||
3bd1e081 MD |
1635 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1636 | if (consumer_data->pid == 0) { | |
712ea556 | 1637 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1638 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1639 | goto error; |
1640 | } | |
3bd1e081 | 1641 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1642 | |
8c0faa1d DG |
1643 | return 0; |
1644 | ||
1645 | error: | |
1646 | return ret; | |
1647 | } | |
1648 | ||
d9800920 | 1649 | /* |
3bd1e081 | 1650 | * Join consumer thread |
d9800920 | 1651 | */ |
3bd1e081 | 1652 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1653 | { |
1654 | void *status; | |
1655 | int ret; | |
1656 | ||
3bd1e081 MD |
1657 | if (consumer_data->pid != 0) { |
1658 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1659 | if (ret) { |
3bd1e081 | 1660 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1661 | return ret; |
1662 | } | |
3bd1e081 | 1663 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1664 | } else { |
1665 | return 0; | |
1666 | } | |
1667 | } | |
1668 | ||
8c0faa1d | 1669 | /* |
3bd1e081 | 1670 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1671 | * |
d063d709 | 1672 | * Return pid if successful else -1. |
8c0faa1d | 1673 | */ |
3bd1e081 | 1674 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1675 | { |
1676 | int ret; | |
1677 | pid_t pid; | |
94c55f17 | 1678 | const char *consumer_to_use; |
53086306 | 1679 | const char *verbosity; |
94c55f17 | 1680 | struct stat st; |
8c0faa1d | 1681 | |
3bd1e081 | 1682 | DBG("Spawning consumerd"); |
c49dc785 | 1683 | |
8c0faa1d DG |
1684 | pid = fork(); |
1685 | if (pid == 0) { | |
1686 | /* | |
3bd1e081 | 1687 | * Exec consumerd. |
8c0faa1d | 1688 | */ |
daee5345 | 1689 | if (opt_verbose_consumer) { |
53086306 DG |
1690 | verbosity = "--verbose"; |
1691 | } else { | |
1692 | verbosity = "--quiet"; | |
1693 | } | |
3bd1e081 MD |
1694 | switch (consumer_data->type) { |
1695 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1696 | /* |
c7704d57 DG |
1697 | * Find out which consumerd to execute. We will first try the |
1698 | * 64-bit path, then the sessiond's installation directory, and | |
1699 | * fallback on the 32-bit one, | |
94c55f17 | 1700 | */ |
63a799e8 AM |
1701 | DBG3("Looking for a kernel consumer at these locations:"); |
1702 | DBG3(" 1) %s", consumerd64_bin); | |
1703 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1704 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1705 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1706 | DBG3("Found location #1"); |
94c55f17 | 1707 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1708 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1709 | DBG3("Found location #2"); |
94c55f17 | 1710 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1711 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1712 | DBG3("Found location #3"); |
eb1e0bd4 | 1713 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1714 | } else { |
63a799e8 | 1715 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1716 | break; |
1717 | } | |
1718 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1719 | execl(consumer_to_use, | |
1720 | "lttng-consumerd", verbosity, "-k", | |
1721 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1722 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1723 | NULL); | |
3bd1e081 | 1724 | break; |
7753dea8 MD |
1725 | case LTTNG_CONSUMER64_UST: |
1726 | { | |
b1e0b6b6 | 1727 | char *tmpnew = NULL; |
8f4905da MD |
1728 | |
1729 | if (consumerd64_libdir[0] != '\0') { | |
1730 | char *tmp; | |
1731 | size_t tmplen; | |
1732 | ||
1733 | tmp = getenv("LD_LIBRARY_PATH"); | |
1734 | if (!tmp) { | |
1735 | tmp = ""; | |
1736 | } | |
1737 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1738 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1739 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1740 | if (!tmpnew) { | |
1741 | ret = -ENOMEM; | |
1742 | goto error; | |
1743 | } | |
1744 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1745 | strcat(tmpnew, consumerd64_libdir); | |
1746 | if (tmp[0] != '\0') { | |
1747 | strcat(tmpnew, ":"); | |
1748 | strcat(tmpnew, tmp); | |
1749 | } | |
1750 | ret = putenv(tmpnew); | |
1751 | if (ret) { | |
1752 | ret = -errno; | |
1753 | goto error; | |
1754 | } | |
1755 | } | |
94c55f17 | 1756 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1757 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1758 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1759 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1760 | NULL); | |
8f4905da MD |
1761 | if (consumerd64_libdir[0] != '\0') { |
1762 | free(tmpnew); | |
1763 | } | |
1764 | if (ret) { | |
1765 | goto error; | |
1766 | } | |
3bd1e081 | 1767 | break; |
7753dea8 MD |
1768 | } |
1769 | case LTTNG_CONSUMER32_UST: | |
1770 | { | |
937dde8e | 1771 | char *tmpnew = NULL; |
8f4905da MD |
1772 | |
1773 | if (consumerd32_libdir[0] != '\0') { | |
1774 | char *tmp; | |
1775 | size_t tmplen; | |
1776 | ||
1777 | tmp = getenv("LD_LIBRARY_PATH"); | |
1778 | if (!tmp) { | |
1779 | tmp = ""; | |
1780 | } | |
1781 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1782 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1783 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1784 | if (!tmpnew) { | |
1785 | ret = -ENOMEM; | |
1786 | goto error; | |
1787 | } | |
1788 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1789 | strcat(tmpnew, consumerd32_libdir); | |
1790 | if (tmp[0] != '\0') { | |
1791 | strcat(tmpnew, ":"); | |
1792 | strcat(tmpnew, tmp); | |
1793 | } | |
1794 | ret = putenv(tmpnew); | |
1795 | if (ret) { | |
1796 | ret = -errno; | |
1797 | goto error; | |
1798 | } | |
1799 | } | |
94c55f17 | 1800 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1801 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1802 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1803 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1804 | NULL); | |
8f4905da MD |
1805 | if (consumerd32_libdir[0] != '\0') { |
1806 | free(tmpnew); | |
1807 | } | |
1808 | if (ret) { | |
1809 | goto error; | |
1810 | } | |
3bd1e081 | 1811 | break; |
7753dea8 | 1812 | } |
3bd1e081 | 1813 | default: |
76d7553f | 1814 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1815 | exit(EXIT_FAILURE); |
1816 | } | |
8c0faa1d | 1817 | if (errno != 0) { |
76d7553f | 1818 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1819 | } |
1820 | exit(EXIT_FAILURE); | |
1821 | } else if (pid > 0) { | |
1822 | ret = pid; | |
8c0faa1d | 1823 | } else { |
76d7553f | 1824 | PERROR("start consumer fork"); |
8c0faa1d | 1825 | ret = -errno; |
8c0faa1d | 1826 | } |
8f4905da | 1827 | error: |
8c0faa1d DG |
1828 | return ret; |
1829 | } | |
1830 | ||
693bd40b | 1831 | /* |
3bd1e081 | 1832 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1833 | */ |
3bd1e081 | 1834 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1835 | { |
1836 | int ret; | |
1837 | ||
3bd1e081 MD |
1838 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1839 | if (consumer_data->pid != 0) { | |
1840 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1841 | goto end; |
1842 | } | |
693bd40b | 1843 | |
3bd1e081 | 1844 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1845 | if (ret < 0) { |
3bd1e081 MD |
1846 | ERR("Spawning consumerd failed"); |
1847 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1848 | goto error; |
693bd40b | 1849 | } |
c49dc785 | 1850 | |
3bd1e081 MD |
1851 | /* Setting up the consumer_data pid */ |
1852 | consumer_data->pid = ret; | |
48842b30 | 1853 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1854 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1855 | |
3bd1e081 MD |
1856 | DBG2("Spawning consumer control thread"); |
1857 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1858 | if (ret < 0) { |
3bd1e081 | 1859 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1860 | goto error; |
1861 | } | |
1862 | ||
c49dc785 | 1863 | end: |
693bd40b DG |
1864 | return 0; |
1865 | ||
1866 | error: | |
1867 | return ret; | |
1868 | } | |
1869 | ||
b73401da | 1870 | /* |
096102bd | 1871 | * Check version of the lttng-modules. |
b73401da | 1872 | */ |
096102bd | 1873 | static int validate_lttng_modules_version(void) |
b73401da | 1874 | { |
096102bd | 1875 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1876 | } |
1877 | ||
b73401da | 1878 | /* |
096102bd | 1879 | * Setup necessary data for kernel tracer action. |
b73401da | 1880 | */ |
096102bd | 1881 | static int init_kernel_tracer(void) |
b73401da DG |
1882 | { |
1883 | int ret; | |
b73401da | 1884 | |
096102bd DG |
1885 | /* Modprobe lttng kernel modules */ |
1886 | ret = modprobe_lttng_control(); | |
b73401da | 1887 | if (ret < 0) { |
b73401da DG |
1888 | goto error; |
1889 | } | |
1890 | ||
096102bd DG |
1891 | /* Open debugfs lttng */ |
1892 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1893 | if (kernel_tracer_fd < 0) { | |
1894 | DBG("Failed to open %s", module_proc_lttng); | |
1895 | ret = -1; | |
1896 | goto error_open; | |
b73401da DG |
1897 | } |
1898 | ||
096102bd DG |
1899 | /* Validate kernel version */ |
1900 | ret = validate_lttng_modules_version(); | |
b73401da | 1901 | if (ret < 0) { |
096102bd | 1902 | goto error_version; |
b73401da DG |
1903 | } |
1904 | ||
096102bd | 1905 | ret = modprobe_lttng_data(); |
b73401da | 1906 | if (ret < 0) { |
096102bd | 1907 | goto error_modules; |
b73401da DG |
1908 | } |
1909 | ||
f3ed775e | 1910 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1911 | return 0; |
1912 | ||
1913 | error_version: | |
1914 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1915 | ret = close(kernel_tracer_fd); |
1916 | if (ret) { | |
1917 | PERROR("close"); | |
1918 | } | |
1919 | kernel_tracer_fd = -1; | |
096102bd DG |
1920 | return LTTCOMM_KERN_VERSION; |
1921 | ||
1922 | error_modules: | |
76d7553f MD |
1923 | ret = close(kernel_tracer_fd); |
1924 | if (ret) { | |
1925 | PERROR("close"); | |
1926 | } | |
096102bd DG |
1927 | |
1928 | error_open: | |
1929 | modprobe_remove_lttng_control(); | |
b73401da DG |
1930 | |
1931 | error: | |
b73401da | 1932 | WARN("No kernel tracer available"); |
a4b35e07 | 1933 | kernel_tracer_fd = -1; |
531d29f9 MD |
1934 | if (!is_root) { |
1935 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1936 | } else { | |
1937 | return LTTCOMM_KERN_NA; | |
1938 | } | |
f3ed775e | 1939 | } |
33a2b854 | 1940 | |
f3ed775e | 1941 | /* |
54d01ffb | 1942 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1943 | */ |
54d01ffb | 1944 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1945 | { |
f40799e8 | 1946 | int ret = 0; |
8c0faa1d | 1947 | |
3bd1e081 | 1948 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1949 | /* |
54d01ffb | 1950 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1951 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1952 | * an extra security check. |
d9800920 | 1953 | */ |
03550b58 | 1954 | if (session->consumer_fd < 0) { |
3bd1e081 | 1955 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1956 | } |
1957 | ||
2bdd86d4 | 1958 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1959 | if (ret < 0) { |
f3ed775e DG |
1960 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1961 | goto error; | |
1962 | } | |
1d4b027a | 1963 | |
3bd1e081 | 1964 | session->consumer_fds_sent = 1; |
f3ed775e | 1965 | } |
1d4b027a DG |
1966 | |
1967 | error: | |
1968 | return ret; | |
8c0faa1d DG |
1969 | } |
1970 | ||
0177d773 DG |
1971 | /* |
1972 | * Create an UST session and add it to the session ust list. | |
1973 | */ | |
44d3bd01 DG |
1974 | static int create_ust_session(struct ltt_session *session, |
1975 | struct lttng_domain *domain) | |
0177d773 | 1976 | { |
13384287 | 1977 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1978 | int ret; |
44d3bd01 DG |
1979 | |
1980 | switch (domain->type) { | |
48842b30 | 1981 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1982 | break; |
1983 | default: | |
13384287 | 1984 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1985 | goto error; |
1986 | } | |
0177d773 DG |
1987 | |
1988 | DBG("Creating UST session"); | |
1989 | ||
a991f516 | 1990 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1991 | if (lus == NULL) { |
44d3bd01 | 1992 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1993 | goto error; |
1994 | } | |
1995 | ||
e11d277b | 1996 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1997 | session->uid, session->gid); |
0177d773 DG |
1998 | if (ret < 0) { |
1999 | if (ret != -EEXIST) { | |
2000 | ERR("Trace directory creation error"); | |
44d3bd01 | 2001 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
2002 | goto error; |
2003 | } | |
2004 | } | |
2005 | ||
f6a9efaa DG |
2006 | /* The domain type dictate different actions on session creation */ |
2007 | switch (domain->type) { | |
48842b30 DG |
2008 | case LTTNG_DOMAIN_UST: |
2009 | /* No ustctl for the global UST domain */ | |
2010 | break; | |
2011 | default: | |
36dc12cc | 2012 | ERR("Unknown UST domain on create session %d", domain->type); |
0177d773 DG |
2013 | goto error; |
2014 | } | |
6df2e2c9 MD |
2015 | lus->uid = session->uid; |
2016 | lus->gid = session->gid; | |
f6a9efaa | 2017 | session->ust_session = lus; |
44d3bd01 DG |
2018 | |
2019 | return LTTCOMM_OK; | |
0177d773 DG |
2020 | |
2021 | error: | |
2022 | free(lus); | |
2023 | return ret; | |
2024 | } | |
2025 | ||
333f285e | 2026 | /* |
d063d709 | 2027 | * Create a kernel tracer session then create the default channel. |
333f285e | 2028 | */ |
f3ed775e | 2029 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 2030 | { |
f3ed775e | 2031 | int ret; |
f3ed775e DG |
2032 | |
2033 | DBG("Creating kernel session"); | |
2034 | ||
2035 | ret = kernel_create_session(session, kernel_tracer_fd); | |
2036 | if (ret < 0) { | |
2037 | ret = LTTCOMM_KERN_SESS_FAIL; | |
2038 | goto error; | |
333f285e DG |
2039 | } |
2040 | ||
d9800920 | 2041 | /* Set kernel consumer socket fd */ |
03550b58 | 2042 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 2043 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
2044 | } |
2045 | ||
e11d277b | 2046 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 2047 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 2048 | if (ret < 0) { |
996b65c8 | 2049 | if (ret != -EEXIST) { |
7a485870 DG |
2050 | ERR("Trace directory creation error"); |
2051 | goto error; | |
2052 | } | |
2053 | } | |
6df2e2c9 MD |
2054 | session->kernel_session->uid = session->uid; |
2055 | session->kernel_session->gid = session->gid; | |
7a485870 | 2056 | |
f3ed775e DG |
2057 | error: |
2058 | return ret; | |
333f285e DG |
2059 | } |
2060 | ||
8e0af1b4 | 2061 | /* |
c7704d57 DG |
2062 | * Check if the UID or GID match the session. Root user has access to all |
2063 | * sessions. | |
8e0af1b4 | 2064 | */ |
c7704d57 | 2065 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 2066 | { |
c7704d57 | 2067 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
2068 | return 0; |
2069 | } else { | |
2070 | return 1; | |
2071 | } | |
2072 | } | |
2073 | ||
2074 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2075 | { | |
2076 | unsigned int i = 0; | |
2077 | struct ltt_session *session; | |
2078 | ||
2079 | DBG("Counting number of available session for UID %d GID %d", | |
2080 | uid, gid); | |
2081 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2082 | /* | |
2083 | * Only list the sessions the user can control. | |
2084 | */ | |
2085 | if (!session_access_ok(session, uid, gid)) { | |
2086 | continue; | |
2087 | } | |
2088 | i++; | |
2089 | } | |
2090 | return i; | |
2091 | } | |
2092 | ||
6c9cc2ab DG |
2093 | /* |
2094 | * Using the session list, filled a lttng_session array to send back to the | |
2095 | * client for session listing. | |
2096 | * | |
2097 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2098 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2099 | */ |
c7704d57 DG |
2100 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2101 | gid_t gid) | |
6c9cc2ab | 2102 | { |
8e0af1b4 | 2103 | unsigned int i = 0; |
6c9cc2ab DG |
2104 | struct ltt_session *session; |
2105 | ||
8e0af1b4 MD |
2106 | DBG("Getting all available session for UID %d GID %d", |
2107 | uid, gid); | |
6c9cc2ab DG |
2108 | /* |
2109 | * Iterate over session list and append data after the control struct in | |
2110 | * the buffer. | |
2111 | */ | |
2112 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2113 | /* |
2114 | * Only list the sessions the user can control. | |
2115 | */ | |
2116 | if (!session_access_ok(session, uid, gid)) { | |
2117 | continue; | |
2118 | } | |
6c9cc2ab | 2119 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2120 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2121 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2122 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2123 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2124 | i++; |
2125 | } | |
2126 | } | |
2127 | ||
9f19cc17 DG |
2128 | /* |
2129 | * Fill lttng_channel array of all channels. | |
2130 | */ | |
b551a063 | 2131 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2132 | struct lttng_channel *channels) |
2133 | { | |
2134 | int i = 0; | |
2135 | struct ltt_kernel_channel *kchan; | |
2136 | ||
2137 | DBG("Listing channels for session %s", session->name); | |
2138 | ||
b551a063 DG |
2139 | switch (domain) { |
2140 | case LTTNG_DOMAIN_KERNEL: | |
2141 | /* Kernel channels */ | |
2142 | if (session->kernel_session != NULL) { | |
2143 | cds_list_for_each_entry(kchan, | |
2144 | &session->kernel_session->channel_list.head, list) { | |
2145 | /* Copy lttng_channel struct to array */ | |
2146 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2147 | channels[i].enabled = kchan->enabled; | |
2148 | i++; | |
2149 | } | |
2150 | } | |
2151 | break; | |
2152 | case LTTNG_DOMAIN_UST: | |
2153 | { | |
bec39940 | 2154 | struct lttng_ht_iter iter; |
b551a063 DG |
2155 | struct ltt_ust_channel *uchan; |
2156 | ||
bec39940 DG |
2157 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2158 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2159 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2160 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2161 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2162 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2163 | channels[i].attr.switch_timer_interval = | |
2164 | uchan->attr.switch_timer_interval; | |
2165 | channels[i].attr.read_timer_interval = | |
2166 | uchan->attr.read_timer_interval; | |
aea829b3 | 2167 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2168 | switch (uchan->attr.output) { |
2169 | case LTTNG_UST_MMAP: | |
2170 | default: | |
2171 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2172 | break; | |
2173 | } | |
9f19cc17 DG |
2174 | i++; |
2175 | } | |
b551a063 DG |
2176 | break; |
2177 | } | |
2178 | default: | |
2179 | break; | |
9f19cc17 | 2180 | } |
b551a063 | 2181 | } |
9f19cc17 | 2182 | |
b551a063 DG |
2183 | /* |
2184 | * Create a list of ust global domain events. | |
2185 | */ | |
2186 | static int list_lttng_ust_global_events(char *channel_name, | |
2187 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2188 | { | |
2189 | int i = 0, ret = 0; | |
2190 | unsigned int nb_event = 0; | |
bec39940 DG |
2191 | struct lttng_ht_iter iter; |
2192 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2193 | struct ltt_ust_channel *uchan; |
2194 | struct ltt_ust_event *uevent; | |
2195 | struct lttng_event *tmp; | |
2196 | ||
2197 | DBG("Listing UST global events for channel %s", channel_name); | |
2198 | ||
2199 | rcu_read_lock(); | |
2200 | ||
bec39940 DG |
2201 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2202 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2203 | if (node == NULL) { |
2204 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2205 | goto error; | |
b551a063 DG |
2206 | } |
2207 | ||
bec39940 | 2208 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2209 | |
bec39940 | 2210 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2211 | |
b551a063 DG |
2212 | if (nb_event == 0) { |
2213 | ret = nb_event; | |
2214 | goto error; | |
2215 | } | |
2216 | ||
2217 | DBG3("Listing UST global %d events", nb_event); | |
2218 | ||
2219 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2220 | if (tmp == NULL) { | |
2221 | ret = -LTTCOMM_FATAL; | |
2222 | goto error; | |
2223 | } | |
2224 | ||
bec39940 | 2225 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2226 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2227 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2228 | tmp[i].enabled = uevent->enabled; | |
2229 | switch (uevent->attr.instrumentation) { | |
2230 | case LTTNG_UST_TRACEPOINT: | |
2231 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2232 | break; | |
2233 | case LTTNG_UST_PROBE: | |
2234 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2235 | break; | |
2236 | case LTTNG_UST_FUNCTION: | |
2237 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2238 | break; | |
0cda4f28 | 2239 | } |
8005f29a | 2240 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2241 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2242 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2243 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2244 | break; |
8005f29a | 2245 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2246 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2247 | break; |
2248 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2249 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2250 | break; |
9f19cc17 | 2251 | } |
d7b75b30 | 2252 | i++; |
9f19cc17 DG |
2253 | } |
2254 | ||
b551a063 DG |
2255 | ret = nb_event; |
2256 | *events = tmp; | |
2257 | ||
2258 | error: | |
2259 | rcu_read_unlock(); | |
2260 | return ret; | |
9f19cc17 DG |
2261 | } |
2262 | ||
2263 | /* | |
b551a063 | 2264 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2265 | */ |
b551a063 DG |
2266 | static int list_lttng_kernel_events(char *channel_name, |
2267 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2268 | { |
b551a063 DG |
2269 | int i = 0, ret; |
2270 | unsigned int nb_event; | |
9f19cc17 | 2271 | struct ltt_kernel_event *event; |
b551a063 DG |
2272 | struct ltt_kernel_channel *kchan; |
2273 | ||
2274 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2275 | if (kchan == NULL) { | |
2276 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2277 | goto error; | |
2278 | } | |
2279 | ||
2280 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2281 | |
2282 | DBG("Listing events for channel %s", kchan->channel->name); | |
2283 | ||
b551a063 DG |
2284 | if (nb_event == 0) { |
2285 | ret = nb_event; | |
2286 | goto error; | |
2287 | } | |
2288 | ||
2289 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2290 | if (*events == NULL) { | |
2291 | ret = LTTCOMM_FATAL; | |
2292 | goto error; | |
2293 | } | |
2294 | ||
9f19cc17 DG |
2295 | /* Kernel channels */ |
2296 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2297 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2298 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2299 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2300 | switch (event->event->instrumentation) { |
2301 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2302 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2303 | break; |
2304 | case LTTNG_KERNEL_KPROBE: | |
2305 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2306 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2307 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2308 | sizeof(struct lttng_kernel_kprobe)); |
2309 | break; | |
2310 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2311 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2312 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2313 | sizeof(struct lttng_kernel_function)); |
2314 | break; | |
0133c199 | 2315 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2316 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2317 | break; |
a54bd42d | 2318 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2319 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2320 | break; |
7a3d1328 MD |
2321 | case LTTNG_KERNEL_ALL: |
2322 | assert(0); | |
2323 | break; | |
9f19cc17 DG |
2324 | } |
2325 | i++; | |
2326 | } | |
b551a063 DG |
2327 | |
2328 | return nb_event; | |
2329 | ||
2330 | error: | |
2331 | return ret; | |
9f19cc17 DG |
2332 | } |
2333 | ||
fac6795d | 2334 | /* |
54d01ffb | 2335 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2336 | */ |
54d01ffb DG |
2337 | static int cmd_disable_channel(struct ltt_session *session, |
2338 | int domain, char *channel_name) | |
fac6795d | 2339 | { |
54d01ffb | 2340 | int ret; |
78f0bacd DG |
2341 | struct ltt_ust_session *usess; |
2342 | ||
2343 | usess = session->ust_session; | |
379473d2 | 2344 | |
54d01ffb | 2345 | switch (domain) { |
78f0bacd DG |
2346 | case LTTNG_DOMAIN_KERNEL: |
2347 | { | |
2348 | ret = channel_kernel_disable(session->kernel_session, | |
2349 | channel_name); | |
2350 | if (ret != LTTCOMM_OK) { | |
2351 | goto error; | |
2352 | } | |
54d01ffb | 2353 | |
78f0bacd DG |
2354 | kernel_wait_quiescent(kernel_tracer_fd); |
2355 | break; | |
2356 | } | |
2357 | case LTTNG_DOMAIN_UST: | |
2358 | { | |
2359 | struct ltt_ust_channel *uchan; | |
bec39940 | 2360 | struct lttng_ht *chan_ht; |
78f0bacd | 2361 | |
7885e399 DG |
2362 | chan_ht = usess->domain_global.channels; |
2363 | ||
2364 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2365 | if (uchan == NULL) { |
2366 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2367 | goto error; |
78f0bacd DG |
2368 | } |
2369 | ||
7885e399 DG |
2370 | ret = channel_ust_disable(usess, domain, uchan); |
2371 | if (ret != LTTCOMM_OK) { | |
54d01ffb | 2372 | goto error; |
78f0bacd | 2373 | } |
78f0bacd DG |
2374 | break; |
2375 | } | |
d78d6610 | 2376 | #if 0 |
78f0bacd DG |
2377 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2378 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2379 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2380 | #endif |
78f0bacd DG |
2381 | default: |
2382 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2383 | goto error; | |
20fe2104 DG |
2384 | } |
2385 | ||
54d01ffb | 2386 | ret = LTTCOMM_OK; |
d65106b1 | 2387 | |
54d01ffb DG |
2388 | error: |
2389 | return ret; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2394 | */ | |
44d3bd01 | 2395 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2396 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2397 | { |
2398 | int ret; | |
f6a9efaa | 2399 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2400 | struct lttng_ht *chan_ht; |
f6a9efaa | 2401 | |
5d56b5aa | 2402 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2403 | |
aea829b3 | 2404 | switch (domain) { |
44d3bd01 DG |
2405 | case LTTNG_DOMAIN_KERNEL: |
2406 | { | |
2407 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2408 | |
44d3bd01 DG |
2409 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2410 | session->kernel_session); | |
2411 | if (kchan == NULL) { | |
2412 | ret = channel_kernel_create(session->kernel_session, | |
2413 | attr, kernel_poll_pipe[1]); | |
2414 | } else { | |
2415 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2416 | } | |
2417 | ||
2418 | if (ret != LTTCOMM_OK) { | |
2419 | goto error; | |
2420 | } | |
2421 | ||
2422 | kernel_wait_quiescent(kernel_tracer_fd); | |
2423 | break; | |
2424 | } | |
f6a9efaa DG |
2425 | case LTTNG_DOMAIN_UST: |
2426 | { | |
2427 | struct ltt_ust_channel *uchan; | |
2428 | ||
7885e399 | 2429 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2430 | |
7885e399 | 2431 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2432 | if (uchan == NULL) { |
7885e399 | 2433 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2434 | } else { |
7885e399 | 2435 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2436 | } |
f6a9efaa DG |
2437 | break; |
2438 | } | |
d78d6610 | 2439 | #if 0 |
78f0bacd DG |
2440 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2441 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2442 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2443 | #endif |
44d3bd01 DG |
2444 | default: |
2445 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2446 | goto error; | |
54d01ffb DG |
2447 | } |
2448 | ||
54d01ffb DG |
2449 | error: |
2450 | return ret; | |
2451 | } | |
2452 | ||
2453 | /* | |
2454 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2455 | */ | |
2456 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2457 | char *channel_name, char *event_name) | |
2458 | { | |
2459 | int ret; | |
54d01ffb DG |
2460 | |
2461 | switch (domain) { | |
2462 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2463 | { |
2464 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2465 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2466 | |
b0a40d28 DG |
2467 | ksess = session->kernel_session; |
2468 | ||
2469 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2470 | if (kchan == NULL) { |
2471 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2472 | goto error; | |
d65106b1 DG |
2473 | } |
2474 | ||
b0a40d28 | 2475 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2476 | if (ret != LTTCOMM_OK) { |
2477 | goto error; | |
2478 | } | |
2479 | ||
2480 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2481 | break; |
2bdd86d4 MD |
2482 | } |
2483 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2484 | { |
b0a40d28 | 2485 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2486 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2487 | |
2488 | usess = session->ust_session; | |
2489 | ||
2490 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2491 | channel_name); | |
2492 | if (uchan == NULL) { | |
2493 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2494 | goto error; | |
2495 | } | |
2496 | ||
7f79d3a1 DG |
2497 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2498 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2499 | goto error; |
2500 | } | |
2501 | ||
7f79d3a1 | 2502 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2503 | channel_name); |
b0a40d28 DG |
2504 | break; |
2505 | } | |
d78d6610 | 2506 | #if 0 |
2bdd86d4 MD |
2507 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2508 | case LTTNG_DOMAIN_UST_PID: | |
2509 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2510 | #endif |
54d01ffb | 2511 | default: |
1ab1ea0b | 2512 | ret = LTTCOMM_UND; |
54d01ffb | 2513 | goto error; |
d65106b1 | 2514 | } |
26cc6b4e | 2515 | |
54d01ffb DG |
2516 | ret = LTTCOMM_OK; |
2517 | ||
2518 | error: | |
2519 | return ret; | |
2520 | } | |
2521 | ||
2522 | /* | |
2523 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2524 | */ | |
2525 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2526 | char *channel_name) | |
2527 | { | |
2528 | int ret; | |
54d01ffb DG |
2529 | |
2530 | switch (domain) { | |
2531 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2532 | { |
2533 | struct ltt_kernel_session *ksess; | |
2534 | struct ltt_kernel_channel *kchan; | |
2535 | ||
2536 | ksess = session->kernel_session; | |
2537 | ||
2538 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2539 | if (kchan == NULL) { |
2540 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2541 | goto error; | |
26cc6b4e DG |
2542 | } |
2543 | ||
9730260e | 2544 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2545 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2546 | goto error; |
26cc6b4e DG |
2547 | } |
2548 | ||
54d01ffb | 2549 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2550 | break; |
9730260e DG |
2551 | } |
2552 | case LTTNG_DOMAIN_UST: | |
2553 | { | |
2554 | struct ltt_ust_session *usess; | |
2555 | struct ltt_ust_channel *uchan; | |
2556 | ||
2557 | usess = session->ust_session; | |
2558 | ||
2559 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2560 | channel_name); | |
2561 | if (uchan == NULL) { | |
2562 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2563 | goto error; | |
2564 | } | |
2565 | ||
7f79d3a1 DG |
2566 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2567 | if (ret != 0) { | |
9730260e DG |
2568 | goto error; |
2569 | } | |
2570 | ||
7f79d3a1 | 2571 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2572 | |
2573 | break; | |
2574 | } | |
d78d6610 | 2575 | #if 0 |
9730260e DG |
2576 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2577 | case LTTNG_DOMAIN_UST_PID: | |
2578 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2579 | #endif |
54d01ffb | 2580 | default: |
1ab1ea0b | 2581 | ret = LTTCOMM_UND; |
54d01ffb | 2582 | goto error; |
26cc6b4e | 2583 | } |
e953ef25 | 2584 | |
54d01ffb | 2585 | ret = LTTCOMM_OK; |
e953ef25 | 2586 | |
54d01ffb DG |
2587 | error: |
2588 | return ret; | |
2589 | } | |
f5177a38 | 2590 | |
54d01ffb DG |
2591 | /* |
2592 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2593 | */ | |
2594 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2595 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2596 | { | |
2597 | int ret; | |
f5177a38 | 2598 | |
54d01ffb DG |
2599 | switch (domain) { |
2600 | case LTTNG_DOMAIN_KERNEL: | |
2601 | /* Add kernel context to kernel tracer */ | |
2602 | ret = context_kernel_add(session->kernel_session, ctx, | |
2603 | event_name, channel_name); | |
2604 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2605 | goto error; |
e953ef25 | 2606 | } |
2bdd86d4 MD |
2607 | break; |
2608 | case LTTNG_DOMAIN_UST: | |
2609 | { | |
55cc08a6 | 2610 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2611 | |
55cc08a6 DG |
2612 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2613 | if (ret != LTTCOMM_OK) { | |
2614 | goto error; | |
2bdd86d4 | 2615 | } |
e953ef25 | 2616 | break; |
2bdd86d4 | 2617 | } |
d78d6610 | 2618 | #if 0 |
55cc08a6 DG |
2619 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2620 | case LTTNG_DOMAIN_UST_PID: | |
2621 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2622 | #endif |
54d01ffb | 2623 | default: |
1ab1ea0b | 2624 | ret = LTTCOMM_UND; |
54d01ffb | 2625 | goto error; |
e953ef25 | 2626 | } |
950131af | 2627 | |
54d01ffb | 2628 | ret = LTTCOMM_OK; |
950131af | 2629 | |
54d01ffb DG |
2630 | error: |
2631 | return ret; | |
2632 | } | |
2633 | ||
2634 | /* | |
2635 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2636 | */ | |
2637 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2638 | char *channel_name, struct lttng_event *event) | |
2639 | { | |
2640 | int ret; | |
f6cd6b0f | 2641 | struct lttng_channel *attr; |
48842b30 | 2642 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2643 | |
2644 | switch (domain) { | |
2645 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2646 | { |
2647 | struct ltt_kernel_channel *kchan; | |
2648 | ||
54d01ffb DG |
2649 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2650 | session->kernel_session); | |
2651 | if (kchan == NULL) { | |
f6cd6b0f DG |
2652 | attr = channel_new_default_attr(domain); |
2653 | if (attr == NULL) { | |
2654 | ret = LTTCOMM_FATAL; | |
2655 | goto error; | |
2656 | } | |
2657 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2658 | ||
54d01ffb | 2659 | /* This call will notify the kernel thread */ |
44d3bd01 | 2660 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2661 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2662 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2663 | free(attr); |
f5177a38 DG |
2664 | goto error; |
2665 | } | |
ff4d74e6 | 2666 | free(attr); |
54d01ffb | 2667 | } |
950131af | 2668 | |
54d01ffb DG |
2669 | /* Get the newly created kernel channel pointer */ |
2670 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2671 | session->kernel_session); | |
2672 | if (kchan == NULL) { | |
2673 | /* This sould not happen... */ | |
2674 | ret = LTTCOMM_FATAL; | |
2675 | goto error; | |
2676 | } | |
f5177a38 | 2677 | |
48842b30 DG |
2678 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2679 | event); | |
54d01ffb | 2680 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2681 | goto error; |
950131af DG |
2682 | } |
2683 | ||
54d01ffb | 2684 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2685 | break; |
2bdd86d4 MD |
2686 | } |
2687 | case LTTNG_DOMAIN_UST: | |
2688 | { | |
aea829b3 | 2689 | struct lttng_channel *attr; |
48842b30 | 2690 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2691 | |
edb67388 | 2692 | /* Get channel from global UST domain */ |
48842b30 DG |
2693 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2694 | channel_name); | |
2695 | if (uchan == NULL) { | |
aea829b3 DG |
2696 | /* Create default channel */ |
2697 | attr = channel_new_default_attr(domain); | |
2698 | if (attr == NULL) { | |
2699 | ret = LTTCOMM_FATAL; | |
2700 | goto error; | |
2701 | } | |
596219f7 | 2702 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2703 | attr->name[NAME_MAX - 1] = '\0'; |
2bdd86d4 | 2704 | |
7885e399 | 2705 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2706 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2707 | free(attr); |
aea829b3 DG |
2708 | goto error; |
2709 | } | |
aea829b3 DG |
2710 | free(attr); |
2711 | ||
2712 | /* Get the newly created channel reference back */ | |
2713 | uchan = trace_ust_find_channel_by_name( | |
2714 | usess->domain_global.channels, channel_name); | |
2715 | if (uchan == NULL) { | |
2716 | /* Something is really wrong */ | |
2bdd86d4 MD |
2717 | ret = LTTCOMM_FATAL; |
2718 | goto error; | |
2719 | } | |
48842b30 | 2720 | } |
2bdd86d4 | 2721 | |
edb67388 | 2722 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2723 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2724 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2725 | goto error; |
2bdd86d4 MD |
2726 | } |
2727 | break; | |
2728 | } | |
d78d6610 | 2729 | #if 0 |
2bdd86d4 MD |
2730 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2731 | case LTTNG_DOMAIN_UST_PID: | |
2732 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2733 | #endif |
54d01ffb | 2734 | default: |
1ab1ea0b | 2735 | ret = LTTCOMM_UND; |
54d01ffb | 2736 | goto error; |
950131af | 2737 | } |
d36b8583 | 2738 | |
54d01ffb | 2739 | ret = LTTCOMM_OK; |
d36b8583 | 2740 | |
54d01ffb DG |
2741 | error: |
2742 | return ret; | |
2743 | } | |
7d29a247 | 2744 | |
54d01ffb DG |
2745 | /* |
2746 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2747 | */ | |
2748 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2749 | char *channel_name, int event_type) |
54d01ffb DG |
2750 | { |
2751 | int ret; | |
2752 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2753 | |
54d01ffb DG |
2754 | switch (domain) { |
2755 | case LTTNG_DOMAIN_KERNEL: | |
2756 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2757 | session->kernel_session); | |
2758 | if (kchan == NULL) { | |
2759 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2760 | ret = channel_kernel_create(session->kernel_session, NULL, |
2761 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2762 | if (ret != LTTCOMM_OK) { |
2763 | goto error; | |
d36b8583 | 2764 | } |
0d0c377a | 2765 | |
8f69e5eb DG |
2766 | /* Get the newly created kernel channel pointer */ |
2767 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2768 | session->kernel_session); | |
2769 | if (kchan == NULL) { | |
2770 | /* This sould not happen... */ | |
2771 | ret = LTTCOMM_FATAL; | |
2772 | goto error; | |
2773 | } | |
2774 | ||
54d01ffb | 2775 | } |
0fdd1e2c | 2776 | |
7a3d1328 | 2777 | switch (event_type) { |
76d45b40 | 2778 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2779 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2780 | kchan, kernel_tracer_fd); |
7a3d1328 | 2781 | break; |
76d45b40 | 2782 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2783 | /* |
7a3d1328 MD |
2784 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2785 | * events already registered to the channel. | |
8c9ae521 | 2786 | */ |
7a3d1328 MD |
2787 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2788 | kchan, kernel_tracer_fd); | |
2789 | break; | |
76d45b40 | 2790 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2791 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2792 | ret = event_kernel_enable_all(session->kernel_session, |
2793 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2794 | break; |
2795 | default: | |
2796 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2797 | goto error; | |
8c9ae521 | 2798 | } |
8f69e5eb DG |
2799 | |
2800 | /* Manage return value */ | |
54d01ffb | 2801 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2802 | goto error; |
d36b8583 DG |
2803 | } |
2804 | ||
54d01ffb | 2805 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2806 | break; |
76d45b40 DG |
2807 | case LTTNG_DOMAIN_UST: |
2808 | { | |
2809 | struct lttng_channel *attr; | |
2810 | struct ltt_ust_channel *uchan; | |
2811 | struct ltt_ust_session *usess = session->ust_session; | |
2812 | ||
2813 | /* Get channel from global UST domain */ | |
2814 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2815 | channel_name); | |
2816 | if (uchan == NULL) { | |
2817 | /* Create default channel */ | |
2818 | attr = channel_new_default_attr(domain); | |
2819 | if (attr == NULL) { | |
2820 | ret = LTTCOMM_FATAL; | |
2821 | goto error; | |
2822 | } | |
2823 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2824 | attr->name[NAME_MAX - 1] = '\0'; | |
2825 | ||
2826 | /* Use the internal command enable channel */ | |
7885e399 | 2827 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2828 | if (ret != LTTCOMM_OK) { |
2829 | free(attr); | |
2830 | goto error; | |
2831 | } | |
2832 | free(attr); | |
2833 | ||
2834 | /* Get the newly created channel reference back */ | |
2835 | uchan = trace_ust_find_channel_by_name( | |
2836 | usess->domain_global.channels, channel_name); | |
2837 | if (uchan == NULL) { | |
2838 | /* Something is really wrong */ | |
2839 | ret = LTTCOMM_FATAL; | |
2840 | goto error; | |
2841 | } | |
2842 | } | |
2843 | ||
2844 | /* At this point, the session and channel exist on the tracer */ | |
2845 | ||
2846 | switch (event_type) { | |
2847 | case LTTNG_EVENT_ALL: | |
2848 | case LTTNG_EVENT_TRACEPOINT: | |
2849 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2850 | if (ret != LTTCOMM_OK) { | |
2851 | goto error; | |
2852 | } | |
2853 | break; | |
2854 | default: | |
2855 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2856 | goto error; | |
2857 | } | |
2858 | ||
2859 | /* Manage return value */ | |
2860 | if (ret != LTTCOMM_OK) { | |
2861 | goto error; | |
2862 | } | |
2863 | ||
2864 | break; | |
2865 | } | |
d78d6610 | 2866 | #if 0 |
76d45b40 DG |
2867 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2868 | case LTTNG_DOMAIN_UST_PID: | |
2869 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2870 | #endif |
54d01ffb | 2871 | default: |
1ab1ea0b | 2872 | ret = LTTCOMM_UND; |
54d01ffb | 2873 | goto error; |
d36b8583 | 2874 | } |
f3ed775e | 2875 | |
54d01ffb DG |
2876 | ret = LTTCOMM_OK; |
2877 | ||
2878 | error: | |
2879 | return ret; | |
2880 | } | |
2881 | ||
2882 | /* | |
2883 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2884 | */ | |
2885 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2886 | { | |
2887 | int ret; | |
2888 | ssize_t nb_events = 0; | |
2889 | ||
2890 | switch (domain) { | |
2891 | case LTTNG_DOMAIN_KERNEL: | |
2892 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2893 | if (nb_events < 0) { | |
2894 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2895 | goto error; | |
894be886 | 2896 | } |
54d01ffb | 2897 | break; |
b551a063 DG |
2898 | case LTTNG_DOMAIN_UST: |
2899 | nb_events = ust_app_list_events(events); | |
2900 | if (nb_events < 0) { | |
2901 | ret = LTTCOMM_UST_LIST_FAIL; | |
2902 | goto error; | |
2903 | } | |
2904 | break; | |
54d01ffb | 2905 | default: |
1ab1ea0b | 2906 | ret = LTTCOMM_UND; |
54d01ffb DG |
2907 | goto error; |
2908 | } | |
894be886 | 2909 | |
54d01ffb | 2910 | return nb_events; |
7d29a247 | 2911 | |
54d01ffb DG |
2912 | error: |
2913 | /* Return negative value to differentiate return code */ | |
2914 | return -ret; | |
2915 | } | |
b389abbe | 2916 | |
54d01ffb DG |
2917 | /* |
2918 | * Command LTTNG_START_TRACE processed by the client thread. | |
2919 | */ | |
2920 | static int cmd_start_trace(struct ltt_session *session) | |
2921 | { | |
2922 | int ret; | |
54d01ffb | 2923 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2924 | struct ltt_ust_session *usess; |
b389abbe | 2925 | |
54d01ffb DG |
2926 | /* Short cut */ |
2927 | ksession = session->kernel_session; | |
b9d9b220 | 2928 | usess = session->ust_session; |
5eb91c98 | 2929 | |
b9ef1c83 | 2930 | if (session->enabled) { |
80e327fa DG |
2931 | /* Already started. */ |
2932 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2933 | goto error; |
2934 | } | |
2935 | ||
464dd62d | 2936 | session->enabled = 1; |
5eb91c98 | 2937 | |
54d01ffb DG |
2938 | /* Kernel tracing */ |
2939 | if (ksession != NULL) { | |
2bdd86d4 MD |
2940 | struct ltt_kernel_channel *kchan; |
2941 | ||
54d01ffb DG |
2942 | /* Open kernel metadata */ |
2943 | if (ksession->metadata == NULL) { | |
2944 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2945 | if (ret < 0) { | |
2946 | ret = LTTCOMM_KERN_META_FAIL; | |
2947 | goto error; | |
b389abbe | 2948 | } |
54d01ffb | 2949 | } |
7d29a247 | 2950 | |
54d01ffb | 2951 | /* Open kernel metadata stream */ |
03550b58 | 2952 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2953 | ret = kernel_open_metadata_stream(ksession); |
2954 | if (ret < 0) { | |
2955 | ERR("Kernel create metadata stream failed"); | |
2956 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2957 | goto error; | |
2958 | } | |
2959 | } | |
2960 | ||
2961 | /* For each channel */ | |
2962 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2963 | if (kchan->stream_count == 0) { | |
2964 | ret = kernel_open_channel_stream(kchan); | |
2965 | if (ret < 0) { | |
2966 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2967 | goto error; |
2968 | } | |
54d01ffb DG |
2969 | /* Update the stream global counter */ |
2970 | ksession->stream_count_global += ret; | |
7d29a247 | 2971 | } |
54d01ffb DG |
2972 | } |
2973 | ||
2974 | /* Setup kernel consumer socket and send fds to it */ | |
2975 | ret = init_kernel_tracing(ksession); | |
2976 | if (ret < 0) { | |
2977 | ret = LTTCOMM_KERN_START_FAIL; | |
2978 | goto error; | |
2979 | } | |
2980 | ||
2981 | /* This start the kernel tracing */ | |
2982 | ret = kernel_start_session(ksession); | |
2983 | if (ret < 0) { | |
2984 | ret = LTTCOMM_KERN_START_FAIL; | |
2985 | goto error; | |
2986 | } | |
2987 | ||
2988 | /* Quiescent wait after starting trace */ | |
2989 | kernel_wait_quiescent(kernel_tracer_fd); | |
2990 | } | |
2991 | ||
36dc12cc | 2992 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2993 | if (usess) { |
2994 | usess->start_trace = 1; | |
36dc12cc | 2995 | |
b9d9b220 DG |
2996 | ret = ust_app_start_trace_all(usess); |
2997 | if (ret < 0) { | |
2998 | ret = LTTCOMM_UST_START_FAIL; | |
2999 | goto error; | |
3000 | } | |
2bdd86d4 | 3001 | } |
54d01ffb DG |
3002 | |
3003 | ret = LTTCOMM_OK; | |
3004 | ||
3005 | error: | |
3006 | return ret; | |
3007 | } | |
3008 | ||
3009 | /* | |
3010 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
3011 | */ | |
3012 | static int cmd_stop_trace(struct ltt_session *session) | |
3013 | { | |
3014 | int ret; | |
3015 | struct ltt_kernel_channel *kchan; | |
3016 | struct ltt_kernel_session *ksession; | |
8be98f9a | 3017 | struct ltt_ust_session *usess; |
54d01ffb DG |
3018 | |
3019 | /* Short cut */ | |
3020 | ksession = session->kernel_session; | |
8be98f9a | 3021 | usess = session->ust_session; |
54d01ffb | 3022 | |
b9ef1c83 | 3023 | if (!session->enabled) { |
80e327fa | 3024 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
3025 | goto error; |
3026 | } | |
3027 | ||
464dd62d | 3028 | session->enabled = 0; |
54d01ffb DG |
3029 | |
3030 | /* Kernel tracer */ | |
3031 | if (ksession != NULL) { | |
3032 | DBG("Stop kernel tracing"); | |
3033 | ||
3034 | /* Flush all buffers before stopping */ | |
3035 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
3036 | if (ret < 0) { | |
3037 | ERR("Kernel metadata flush failed"); | |
3038 | } | |
f34daff7 | 3039 | |
54d01ffb DG |
3040 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
3041 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 3042 | if (ret < 0) { |
54d01ffb | 3043 | ERR("Kernel flush buffer error"); |
7d29a247 | 3044 | } |
54d01ffb | 3045 | } |
19e70852 | 3046 | |
54d01ffb DG |
3047 | ret = kernel_stop_session(ksession); |
3048 | if (ret < 0) { | |
3049 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 3050 | goto error; |
f3ed775e | 3051 | } |
54d01ffb DG |
3052 | |
3053 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 3054 | } |
54d01ffb | 3055 | |
8be98f9a MD |
3056 | if (usess) { |
3057 | usess->start_trace = 0; | |
2bdd86d4 | 3058 | |
8be98f9a | 3059 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 3060 | if (ret < 0) { |
190df5ac | 3061 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
3062 | goto error; |
3063 | } | |
2bdd86d4 | 3064 | } |
54d01ffb DG |
3065 | |
3066 | ret = LTTCOMM_OK; | |
3067 | ||
3068 | error: | |
3069 | return ret; | |
3070 | } | |
3071 | ||
3072 | /* | |
3073 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
3074 | */ | |
730389d9 | 3075 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
3076 | { |
3077 | int ret; | |
3078 | ||
730389d9 DG |
3079 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
3080 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
3081 | if (ret != LTTCOMM_OK) { |
3082 | goto error; | |
3083 | } | |
3084 | ||
3085 | ret = LTTCOMM_OK; | |
3086 | ||
3087 | error: | |
3088 | return ret; | |
3089 | } | |
3090 | ||
3091 | /* | |
3092 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3093 | */ | |
3094 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3095 | { | |
3096 | int ret; | |
3097 | ||
3098 | /* Clean kernel session teardown */ | |
3099 | teardown_kernel_session(session); | |
84cd17c6 MD |
3100 | /* UST session teardown */ |
3101 | teardown_ust_session(session); | |
54d01ffb DG |
3102 | |
3103 | /* | |
3104 | * Must notify the kernel thread here to update it's poll setin order | |
3105 | * to remove the channel(s)' fd just destroyed. | |
3106 | */ | |
3107 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3108 | if (ret < 0) { | |
76d7553f | 3109 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3110 | } |
3111 | ||
271933a4 | 3112 | ret = session_destroy(session); |
54d01ffb DG |
3113 | |
3114 | return ret; | |
3115 | } | |
3116 | ||
3117 | /* | |
3118 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3119 | */ | |
3120 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3121 | { | |
3122 | int ret; | |
3123 | ||
3124 | switch (domain) { | |
3125 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3126 | { |
54d01ffb | 3127 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3128 | |
54d01ffb DG |
3129 | kcalibrate.type = calibrate->type; |
3130 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3131 | if (ret < 0) { |
54d01ffb DG |
3132 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3133 | goto error; | |
33a2b854 | 3134 | } |
54d01ffb DG |
3135 | break; |
3136 | } | |
4466912f DG |
3137 | case LTTNG_DOMAIN_UST: |
3138 | { | |
3139 | struct lttng_ust_calibrate ucalibrate; | |
3140 | ||
3141 | ucalibrate.type = calibrate->type; | |
3142 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3143 | if (ret < 0) { | |
3144 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3145 | goto error; | |
3146 | } | |
3147 | break; | |
3148 | } | |
54d01ffb | 3149 | default: |
1ab1ea0b | 3150 | ret = LTTCOMM_UND; |
54d01ffb DG |
3151 | goto error; |
3152 | } | |
33a2b854 | 3153 | |
54d01ffb | 3154 | ret = LTTCOMM_OK; |
33a2b854 | 3155 | |
54d01ffb DG |
3156 | error: |
3157 | return ret; | |
3158 | } | |
7d29a247 | 3159 | |
54d01ffb DG |
3160 | /* |
3161 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3162 | */ | |
3163 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3164 | char *sock_path) | |
3165 | { | |
3166 | int ret, sock; | |
b389abbe | 3167 | |
54d01ffb DG |
3168 | switch (domain) { |
3169 | case LTTNG_DOMAIN_KERNEL: | |
3170 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3171 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3172 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3173 | goto error; | |
3174 | } | |
3175 | ||
3176 | sock = lttcomm_connect_unix_sock(sock_path); | |
3177 | if (sock < 0) { | |
3178 | ret = LTTCOMM_CONNECT_FAIL; | |
3179 | goto error; | |
3180 | } | |
3181 | ||
3182 | session->kernel_session->consumer_fd = sock; | |
3183 | break; | |
3184 | default: | |
3185 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3186 | ret = LTTCOMM_UND; |
54d01ffb DG |
3187 | goto error; |
3188 | } | |
3189 | ||
3190 | ret = LTTCOMM_OK; | |
3191 | ||
3192 | error: | |
3193 | return ret; | |
3194 | } | |
3195 | ||
3196 | /* | |
3197 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3198 | */ | |
3199 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3200 | struct lttng_domain **domains) | |
3201 | { | |
b551a063 | 3202 | int ret, index = 0; |
54d01ffb DG |
3203 | ssize_t nb_dom = 0; |
3204 | ||
3205 | if (session->kernel_session != NULL) { | |
b551a063 | 3206 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3207 | nb_dom++; |
3208 | } | |
3209 | ||
b551a063 DG |
3210 | if (session->ust_session != NULL) { |
3211 | DBG3("Listing domains found UST global domain"); | |
3212 | nb_dom++; | |
3213 | } | |
54d01ffb | 3214 | |
b551a063 | 3215 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3216 | if (*domains == NULL) { |
3217 | ret = -LTTCOMM_FATAL; | |
3218 | goto error; | |
3219 | } | |
3220 | ||
b551a063 DG |
3221 | if (session->kernel_session != NULL) { |
3222 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3223 | index++; | |
3224 | } | |
3225 | ||
3226 | if (session->ust_session != NULL) { | |
3227 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3228 | index++; | |
3229 | } | |
54d01ffb | 3230 | |
54d01ffb DG |
3231 | return nb_dom; |
3232 | ||
3233 | error: | |
3234 | return ret; | |
3235 | } | |
3236 | ||
3237 | /* | |
3238 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3239 | */ | |
b551a063 | 3240 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3241 | struct lttng_channel **channels) |
3242 | { | |
3243 | int ret; | |
3244 | ssize_t nb_chan = 0; | |
3245 | ||
b551a063 DG |
3246 | switch (domain) { |
3247 | case LTTNG_DOMAIN_KERNEL: | |
3248 | if (session->kernel_session != NULL) { | |
3249 | nb_chan = session->kernel_session->channel_count; | |
3250 | } | |
0df502fd | 3251 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3252 | break; |
3253 | case LTTNG_DOMAIN_UST: | |
3254 | if (session->ust_session != NULL) { | |
bec39940 | 3255 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3256 | session->ust_session->domain_global.channels); |
3257 | } | |
0df502fd | 3258 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3259 | break; |
3260 | default: | |
3261 | *channels = NULL; | |
1ab1ea0b | 3262 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3263 | goto error; |
3264 | } | |
3265 | ||
b551a063 DG |
3266 | if (nb_chan > 0) { |
3267 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3268 | if (*channels == NULL) { | |
3269 | ret = -LTTCOMM_FATAL; | |
3270 | goto error; | |
3271 | } | |
54d01ffb | 3272 | |
b551a063 DG |
3273 | list_lttng_channels(domain, session, *channels); |
3274 | } else { | |
3275 | *channels = NULL; | |
3276 | } | |
2bdd86d4 | 3277 | |
54d01ffb DG |
3278 | return nb_chan; |
3279 | ||
3280 | error: | |
3281 | return ret; | |
3282 | } | |
3283 | ||
3284 | /* | |
3285 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3286 | */ | |
b551a063 | 3287 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3288 | char *channel_name, struct lttng_event **events) |
3289 | { | |
b551a063 | 3290 | int ret = 0; |
54d01ffb | 3291 | ssize_t nb_event = 0; |
54d01ffb | 3292 | |
b551a063 DG |
3293 | switch (domain) { |
3294 | case LTTNG_DOMAIN_KERNEL: | |
3295 | if (session->kernel_session != NULL) { | |
3296 | nb_event = list_lttng_kernel_events(channel_name, | |
3297 | session->kernel_session, events); | |
54d01ffb | 3298 | } |
b551a063 DG |
3299 | break; |
3300 | case LTTNG_DOMAIN_UST: | |
3301 | { | |
3302 | if (session->ust_session != NULL) { | |
3303 | nb_event = list_lttng_ust_global_events(channel_name, | |
3304 | &session->ust_session->domain_global, events); | |
54d01ffb | 3305 | } |
b551a063 | 3306 | break; |
54d01ffb | 3307 | } |
b551a063 | 3308 | default: |
1ab1ea0b | 3309 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3310 | goto error; |
3311 | } | |
3312 | ||
b551a063 | 3313 | ret = nb_event; |
54d01ffb DG |
3314 | |
3315 | error: | |
3316 | return ret; | |
3317 | } | |
3318 | ||
3319 | /* | |
3320 | * Process the command requested by the lttng client within the command | |
3321 | * context structure. This function make sure that the return structure (llm) | |
3322 | * is set and ready for transmission before returning. | |
3323 | * | |
3324 | * Return any error encountered or 0 for success. | |
3325 | */ | |
3326 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3327 | { | |
3328 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3329 | int need_tracing_session = 1; |
2e09ba09 | 3330 | int need_domain; |
54d01ffb DG |
3331 | |
3332 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3333 | ||
2e09ba09 MD |
3334 | switch (cmd_ctx->lsm->cmd_type) { |
3335 | case LTTNG_CREATE_SESSION: | |
3336 | case LTTNG_DESTROY_SESSION: | |
3337 | case LTTNG_LIST_SESSIONS: | |
3338 | case LTTNG_LIST_DOMAINS: | |
3339 | case LTTNG_START_TRACE: | |
3340 | case LTTNG_STOP_TRACE: | |
3341 | need_domain = 0; | |
3aace903 | 3342 | break; |
2e09ba09 MD |
3343 | default: |
3344 | need_domain = 1; | |
3345 | } | |
3346 | ||
3347 | if (opt_no_kernel && need_domain | |
3348 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3349 | if (!is_root) { |
3350 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3351 | } else { | |
3352 | ret = LTTCOMM_KERN_NA; | |
3353 | } | |
4fba7219 DG |
3354 | goto error; |
3355 | } | |
3356 | ||
54d01ffb DG |
3357 | /* |
3358 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3359 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3360 | * command. |
3361 | */ | |
3362 | switch(cmd_ctx->lsm->cmd_type) { | |
3363 | case LTTNG_LIST_SESSIONS: | |
3364 | case LTTNG_LIST_TRACEPOINTS: | |
3365 | case LTTNG_LIST_DOMAINS: | |
3366 | case LTTNG_LIST_CHANNELS: | |
3367 | case LTTNG_LIST_EVENTS: | |
3368 | break; | |
3369 | default: | |
3370 | /* Setup lttng message with no payload */ | |
3371 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3372 | if (ret < 0) { | |
3373 | /* This label does not try to unlock the session */ | |
3374 | goto init_setup_error; | |
3375 | } | |
3376 | } | |
3377 | ||
3378 | /* Commands that DO NOT need a session. */ | |
3379 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3380 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3381 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3382 | case LTTNG_LIST_SESSIONS: |
3383 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3384 | need_tracing_session = 0; |
54d01ffb DG |
3385 | break; |
3386 | default: | |
3387 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3388 | /* |
3389 | * We keep the session list lock across _all_ commands | |
3390 | * for now, because the per-session lock does not | |
3391 | * handle teardown properly. | |
3392 | */ | |
74babd95 | 3393 | session_lock_list(); |
54d01ffb DG |
3394 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3395 | if (cmd_ctx->session == NULL) { | |
3396 | if (cmd_ctx->lsm->session.name != NULL) { | |
3397 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3398 | } else { | |
3399 | /* If no session name specified */ | |
3400 | ret = LTTCOMM_SELECT_SESS; | |
3401 | } | |
3402 | goto error; | |
3403 | } else { | |
3404 | /* Acquire lock for the session */ | |
3405 | session_lock(cmd_ctx->session); | |
3406 | } | |
3407 | break; | |
3408 | } | |
b389abbe | 3409 | |
2e09ba09 MD |
3410 | if (!need_domain) { |
3411 | goto skip_domain; | |
3412 | } | |
54d01ffb DG |
3413 | /* |
3414 | * Check domain type for specific "pre-action". | |
3415 | */ | |
3416 | switch (cmd_ctx->lsm->domain.type) { | |
3417 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3418 | if (!is_root) { |
531d29f9 | 3419 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3420 | goto error; |
3421 | } | |
3422 | ||
54d01ffb | 3423 | /* Kernel tracer check */ |
a4b35e07 | 3424 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3425 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3426 | ret = init_kernel_tracer(); |
3427 | if (ret != 0) { | |
54d01ffb DG |
3428 | goto error; |
3429 | } | |
3430 | } | |
5eb91c98 | 3431 | |
54d01ffb | 3432 | /* Need a session for kernel command */ |
44d3bd01 | 3433 | if (need_tracing_session) { |
54d01ffb DG |
3434 | if (cmd_ctx->session->kernel_session == NULL) { |
3435 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3436 | if (ret < 0) { |
54d01ffb | 3437 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3438 | goto error; |
3439 | } | |
b389abbe | 3440 | } |
7d29a247 | 3441 | |
54d01ffb | 3442 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3443 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3444 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3445 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3446 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3447 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3448 | if (ret < 0) { |
54d01ffb DG |
3449 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3450 | goto error; | |
950131af | 3451 | } |
3ff2ecac MD |
3452 | } else { |
3453 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3454 | } |
0d0c377a | 3455 | } |
54d01ffb | 3456 | break; |
2bdd86d4 | 3457 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3458 | { |
44d3bd01 | 3459 | if (need_tracing_session) { |
f6a9efaa | 3460 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3461 | ret = create_ust_session(cmd_ctx->session, |
3462 | &cmd_ctx->lsm->domain); | |
3463 | if (ret != LTTCOMM_OK) { | |
3464 | goto error; | |
3465 | } | |
3466 | } | |
7753dea8 MD |
3467 | /* Start the UST consumer daemons */ |
3468 | /* 64-bit */ | |
3469 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3470 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3471 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3472 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3473 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3474 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3475 | if (ret < 0) { |
7753dea8 MD |
3476 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3477 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3478 | goto error; |
3479 | } | |
48842b30 | 3480 | |
7753dea8 | 3481 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3482 | } else { |
7753dea8 MD |
3483 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3484 | } | |
3485 | /* 32-bit */ | |
fc7a59ce | 3486 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3487 | ustconsumer32_data.pid == 0 && |
3488 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3489 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3490 | ret = start_consumerd(&ustconsumer32_data); | |
3491 | if (ret < 0) { | |
3492 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3493 | ust_consumerd32_fd = -EINVAL; | |
3494 | goto error; | |
3495 | } | |
3496 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3497 | } else { | |
3498 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3499 | } |
44d3bd01 DG |
3500 | } |
3501 | break; | |
3502 | } | |
54d01ffb | 3503 | default: |
54d01ffb DG |
3504 | break; |
3505 | } | |
2e09ba09 | 3506 | skip_domain: |
33a2b854 | 3507 | |
8e0af1b4 MD |
3508 | /* |
3509 | * Check that the UID or GID match that of the tracing session. | |
3510 | * The root user can interact with all sessions. | |
3511 | */ | |
3512 | if (need_tracing_session) { | |
3513 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3514 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3515 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3516 | ret = LTTCOMM_EPERM; |
3517 | goto error; | |
3518 | } | |
3519 | } | |
3520 | ||
54d01ffb DG |
3521 | /* Process by command type */ |
3522 | switch (cmd_ctx->lsm->cmd_type) { | |
3523 | case LTTNG_ADD_CONTEXT: | |
3524 | { | |
3525 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3526 | cmd_ctx->lsm->u.context.channel_name, | |
3527 | cmd_ctx->lsm->u.context.event_name, | |
3528 | &cmd_ctx->lsm->u.context.ctx); | |
3529 | break; | |
3530 | } | |
3531 | case LTTNG_DISABLE_CHANNEL: | |
3532 | { | |
3533 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3534 | cmd_ctx->lsm->u.disable.channel_name); | |
3535 | break; | |
3536 | } | |
3537 | case LTTNG_DISABLE_EVENT: | |
3538 | { | |
3539 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3540 | cmd_ctx->lsm->u.disable.channel_name, | |
3541 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3542 | break; |
3543 | } | |
54d01ffb DG |
3544 | case LTTNG_DISABLE_ALL_EVENT: |
3545 | { | |
2bdd86d4 | 3546 | DBG("Disabling all events"); |
54d01ffb DG |
3547 | |
3548 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3549 | cmd_ctx->lsm->u.disable.channel_name); | |
3550 | break; | |
3551 | } | |
3552 | case LTTNG_ENABLE_CHANNEL: | |
3553 | { | |
902c9922 | 3554 | tracepoint(enable_ust_channel_start); |
aea829b3 | 3555 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb | 3556 | &cmd_ctx->lsm->u.channel.chan); |
902c9922 DG |
3557 | tracepoint(enable_ust_channel_end); |
3558 | bench_print_enable_ust_channel(); | |
54d01ffb DG |
3559 | break; |
3560 | } | |
3561 | case LTTNG_ENABLE_EVENT: | |
3562 | { | |
902c9922 | 3563 | tracepoint(enable_ust_event_start); |
54d01ffb DG |
3564 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3565 | cmd_ctx->lsm->u.enable.channel_name, | |
3566 | &cmd_ctx->lsm->u.enable.event); | |
902c9922 | 3567 | tracepoint(enable_ust_event_end); |
54d01ffb DG |
3568 | break; |
3569 | } | |
3570 | case LTTNG_ENABLE_ALL_EVENT: | |
3571 | { | |
2bdd86d4 | 3572 | DBG("Enabling all events"); |
54d01ffb | 3573 | |
902c9922 | 3574 | tracepoint(enable_ust_event_start); |
54d01ffb | 3575 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
8c9ae521 DG |
3576 | cmd_ctx->lsm->u.enable.channel_name, |
3577 | cmd_ctx->lsm->u.enable.event.type); | |
902c9922 | 3578 | tracepoint(enable_ust_event_end); |
54d01ffb DG |
3579 | break; |
3580 | } | |
052da939 | 3581 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3582 | { |
9f19cc17 | 3583 | struct lttng_event *events; |
54d01ffb | 3584 | ssize_t nb_events; |
052da939 | 3585 | |
54d01ffb DG |
3586 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3587 | if (nb_events < 0) { | |
3588 | ret = -nb_events; | |
3589 | goto error; | |
2ef84c95 DG |
3590 | } |
3591 | ||
3592 | /* | |
3593 | * Setup lttng message with payload size set to the event list size in | |
3594 | * bytes and then copy list into the llm payload. | |
3595 | */ | |
052da939 | 3596 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3597 | if (ret < 0) { |
052da939 | 3598 | free(events); |
2ef84c95 DG |
3599 | goto setup_error; |
3600 | } | |
3601 | ||
3602 | /* Copy event list into message payload */ | |
9f19cc17 | 3603 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3604 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3605 | |
9f19cc17 | 3606 | free(events); |
2ef84c95 DG |
3607 | |
3608 | ret = LTTCOMM_OK; | |
3609 | break; | |
3610 | } | |
f3ed775e | 3611 | case LTTNG_START_TRACE: |
8c0faa1d | 3612 | { |
902c9922 | 3613 | tracepoint(start_ust_start); |
54d01ffb | 3614 | ret = cmd_start_trace(cmd_ctx->session); |
902c9922 DG |
3615 | tracepoint(start_ust_end); |
3616 | bench_print_start_ust(); | |
8c0faa1d DG |
3617 | break; |
3618 | } | |
f3ed775e | 3619 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3620 | { |
54d01ffb | 3621 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3622 | break; |
3623 | } | |
5e16da05 MD |
3624 | case LTTNG_CREATE_SESSION: |
3625 | { | |
3c6bae61 | 3626 | tracepoint(create_session_start); |
54d01ffb | 3627 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3628 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
3c6bae61 | 3629 | tracepoint(create_session_end); |
902c9922 | 3630 | bench_print_create_session(); |
5e16da05 MD |
3631 | break; |
3632 | } | |
3633 | case LTTNG_DESTROY_SESSION: | |
3634 | { | |
3c6bae61 | 3635 | tracepoint(destroy_session_start); |
54d01ffb DG |
3636 | ret = cmd_destroy_session(cmd_ctx->session, |
3637 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 3638 | tracepoint(destroy_session_end); |
256a5576 MD |
3639 | /* |
3640 | * Set session to NULL so we do not unlock it after | |
3641 | * free. | |
3642 | */ | |
3643 | cmd_ctx->session = NULL; | |
5461b305 | 3644 | break; |
5e16da05 | 3645 | } |
9f19cc17 | 3646 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3647 | { |
54d01ffb DG |
3648 | ssize_t nb_dom; |
3649 | struct lttng_domain *domains; | |
5461b305 | 3650 | |
54d01ffb DG |
3651 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3652 | if (nb_dom < 0) { | |
3653 | ret = -nb_dom; | |
3654 | goto error; | |
ce3d728c | 3655 | } |
520ff687 | 3656 | |
54d01ffb | 3657 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3658 | if (ret < 0) { |
3659 | goto setup_error; | |
520ff687 | 3660 | } |
57167058 | 3661 | |
54d01ffb DG |
3662 | /* Copy event list into message payload */ |
3663 | memcpy(cmd_ctx->llm->payload, domains, | |
3664 | nb_dom * sizeof(struct lttng_domain)); | |
3665 | ||
3666 | free(domains); | |
5e16da05 | 3667 | |
5461b305 | 3668 | ret = LTTCOMM_OK; |
5e16da05 MD |
3669 | break; |
3670 | } | |
9f19cc17 | 3671 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3672 | { |
54d01ffb DG |
3673 | size_t nb_chan; |
3674 | struct lttng_channel *channels; | |
3675 | ||
b551a063 DG |
3676 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3677 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3678 | if (nb_chan < 0) { |
3679 | ret = -nb_chan; | |
3680 | goto error; | |
5461b305 | 3681 | } |
ca95a216 | 3682 | |
54d01ffb | 3683 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3684 | if (ret < 0) { |
3685 | goto setup_error; | |
3686 | } | |
9f19cc17 | 3687 | |
54d01ffb DG |
3688 | /* Copy event list into message payload */ |
3689 | memcpy(cmd_ctx->llm->payload, channels, | |
3690 | nb_chan * sizeof(struct lttng_channel)); | |
3691 | ||
3692 | free(channels); | |
9f19cc17 DG |
3693 | |
3694 | ret = LTTCOMM_OK; | |
5461b305 | 3695 | break; |
5e16da05 | 3696 | } |
9f19cc17 | 3697 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3698 | { |
b551a063 | 3699 | ssize_t nb_event; |
684d34d2 | 3700 | struct lttng_event *events = NULL; |
9f19cc17 | 3701 | |
b551a063 | 3702 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3703 | cmd_ctx->lsm->u.list.channel_name, &events); |
3704 | if (nb_event < 0) { | |
3705 | ret = -nb_event; | |
3706 | goto error; | |
5461b305 | 3707 | } |
ca95a216 | 3708 | |
54d01ffb | 3709 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3710 | if (ret < 0) { |
3711 | goto setup_error; | |
3712 | } | |
9f19cc17 | 3713 | |
54d01ffb DG |
3714 | /* Copy event list into message payload */ |
3715 | memcpy(cmd_ctx->llm->payload, events, | |
3716 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3717 | |
54d01ffb | 3718 | free(events); |
9f19cc17 DG |
3719 | |
3720 | ret = LTTCOMM_OK; | |
5461b305 | 3721 | break; |
5e16da05 MD |
3722 | } |
3723 | case LTTNG_LIST_SESSIONS: | |
3724 | { | |
8e0af1b4 | 3725 | unsigned int nr_sessions; |
5461b305 | 3726 | |
8e0af1b4 | 3727 | session_lock_list(); |
730389d9 DG |
3728 | nr_sessions = lttng_sessions_count( |
3729 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3730 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3731 | |
8e0af1b4 | 3732 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3733 | if (ret < 0) { |
54d01ffb | 3734 | session_unlock_list(); |
5461b305 | 3735 | goto setup_error; |
e065084a | 3736 | } |
5e16da05 | 3737 | |
6c9cc2ab | 3738 | /* Filled the session array */ |
8e0af1b4 | 3739 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3740 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3741 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3742 | |
54d01ffb | 3743 | session_unlock_list(); |
5e16da05 | 3744 | |
5461b305 | 3745 | ret = LTTCOMM_OK; |
5e16da05 MD |
3746 | break; |
3747 | } | |
d0254c7c MD |
3748 | case LTTNG_CALIBRATE: |
3749 | { | |
54d01ffb DG |
3750 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3751 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3752 | break; |
3753 | } | |
d9800920 DG |
3754 | case LTTNG_REGISTER_CONSUMER: |
3755 | { | |
54d01ffb DG |
3756 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3757 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3758 | break; |
3759 | } | |
5e16da05 | 3760 | default: |
5e16da05 | 3761 | ret = LTTCOMM_UND; |
5461b305 | 3762 | break; |
fac6795d DG |
3763 | } |
3764 | ||
5461b305 | 3765 | error: |
5461b305 DG |
3766 | if (cmd_ctx->llm == NULL) { |
3767 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3768 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3769 | goto setup_error; |
3770 | } | |
3771 | } | |
54d01ffb | 3772 | /* Set return code */ |
5461b305 | 3773 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3774 | setup_error: |
b5541356 | 3775 | if (cmd_ctx->session) { |
54d01ffb | 3776 | session_unlock(cmd_ctx->session); |
b5541356 | 3777 | } |
256a5576 MD |
3778 | if (need_tracing_session) { |
3779 | session_unlock_list(); | |
3780 | } | |
54d01ffb | 3781 | init_setup_error: |
8028d920 | 3782 | return ret; |
fac6795d DG |
3783 | } |
3784 | ||
1d4b027a | 3785 | /* |
d063d709 DG |
3786 | * This thread manage all clients request using the unix client socket for |
3787 | * communication. | |
1d4b027a DG |
3788 | */ |
3789 | static void *thread_manage_clients(void *data) | |
3790 | { | |
a4b35e07 | 3791 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3792 | uint32_t revents, nb_fd; |
273ea72c | 3793 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3794 | struct lttng_poll_event events; |
1d4b027a | 3795 | |
b25a8868 DG |
3796 | tracepoint(sessiond_th_cli_start); |
3797 | ||
1d4b027a DG |
3798 | DBG("[thread] Manage client started"); |
3799 | ||
f6a9efaa DG |
3800 | rcu_register_thread(); |
3801 | ||
1d4b027a DG |
3802 | ret = lttcomm_listen_unix_sock(client_sock); |
3803 | if (ret < 0) { | |
3804 | goto error; | |
3805 | } | |
3806 | ||
5eb91c98 DG |
3807 | /* |
3808 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3809 | * more will be added to this poll set. | |
3810 | */ | |
3811 | ret = create_thread_poll_set(&events, 2); | |
3812 | if (ret < 0) { | |
3813 | goto error; | |
3814 | } | |
273ea72c | 3815 | |
5eb91c98 DG |
3816 | /* Add the application registration socket */ |
3817 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3818 | if (ret < 0) { | |
3819 | goto error; | |
3820 | } | |
273ea72c | 3821 | |
bbd973c2 DG |
3822 | /* |
3823 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3824 | */ |
3825 | if (opt_sig_parent) { | |
8db8d1dc | 3826 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3827 | } |
3828 | ||
3829 | while (1) { | |
1d4b027a | 3830 | DBG("Accepting client command ..."); |
273ea72c | 3831 | |
b25a8868 DG |
3832 | tracepoint(sessiond_th_cli_poll); |
3833 | ||
5eb91c98 DG |
3834 | nb_fd = LTTNG_POLL_GETNB(&events); |
3835 | ||
273ea72c | 3836 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3837 | restart: |
5eb91c98 | 3838 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3839 | if (ret < 0) { |
88f2b785 MD |
3840 | /* |
3841 | * Restart interrupted system call. | |
3842 | */ | |
3843 | if (errno == EINTR) { | |
3844 | goto restart; | |
3845 | } | |
273ea72c DG |
3846 | goto error; |
3847 | } | |
3848 | ||
5eb91c98 DG |
3849 | for (i = 0; i < nb_fd; i++) { |
3850 | /* Fetch once the poll data */ | |
3851 | revents = LTTNG_POLL_GETEV(&events, i); | |
3852 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3853 | ||
3854 | /* Thread quit pipe has been closed. Killing thread. */ | |
3855 | ret = check_thread_quit_pipe(pollfd, revents); | |
3856 | if (ret) { | |
3857 | goto error; | |
3858 | } | |
3859 | ||
3860 | /* Event on the registration socket */ | |
3861 | if (pollfd == client_sock) { | |
3862 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3863 | ERR("Client socket poll error"); | |
3864 | goto error; | |
3865 | } | |
3866 | } | |
273ea72c DG |
3867 | } |
3868 | ||
5eb91c98 DG |
3869 | DBG("Wait for client response"); |
3870 | ||
1d4b027a DG |
3871 | sock = lttcomm_accept_unix_sock(client_sock); |
3872 | if (sock < 0) { | |
3873 | goto error; | |
3874 | } | |
3875 | ||
be040666 DG |
3876 | /* Set socket option for credentials retrieval */ |
3877 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3878 | if (ret < 0) { | |
3879 | goto error; | |
3880 | } | |
3881 | ||
1d4b027a | 3882 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3883 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3884 | if (cmd_ctx == NULL) { |
76d7553f | 3885 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3886 | goto error; |
5eb91c98 | 3887 | } |
1d4b027a DG |
3888 | |
3889 | /* Allocate data buffer for reception */ | |
ba7f0ae5 | 3890 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3891 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3892 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3893 | goto error; |
3894 | } | |
1d4b027a | 3895 | |
1d4b027a DG |
3896 | cmd_ctx->llm = NULL; |
3897 | cmd_ctx->session = NULL; | |
3898 | ||
3899 | /* | |
3900 | * Data is received from the lttng client. The struct | |
3901 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3902 | * the client. | |
3903 | */ | |
3904 | DBG("Receiving data from client ..."); | |
be040666 DG |
3905 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3906 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
1d4b027a | 3907 | if (ret <= 0) { |
5eb91c98 | 3908 | DBG("Nothing recv() from client... continuing"); |
76d7553f MD |
3909 | ret = close(sock); |
3910 | if (ret) { | |
3911 | PERROR("close"); | |
3912 | } | |
3913 | sock = -1; | |
a2c0da86 | 3914 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3915 | continue; |
3916 | } | |
3917 | ||
5eb91c98 DG |
3918 | // TODO: Validate cmd_ctx including sanity check for |
3919 | // security purpose. | |
f7776ea7 | 3920 | |
f6a9efaa | 3921 | rcu_thread_online(); |
1d4b027a DG |
3922 | /* |
3923 | * This function dispatch the work to the kernel or userspace tracer | |
3924 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3925 | * informations for the client. The command context struct contains | |
3926 | * everything this function may needs. | |
3927 | */ | |
3928 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3929 | rcu_thread_offline(); |
1d4b027a | 3930 | if (ret < 0) { |
bbd973c2 | 3931 | /* |
5eb91c98 | 3932 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3933 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3934 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3935 | */ |
a2fb29a5 | 3936 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3937 | continue; |
3938 | } | |
3939 | ||
54d01ffb DG |
3940 | DBG("Sending response (size: %d, retcode: %s)", |
3941 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3942 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3943 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
3944 | if (ret < 0) { |
3945 | ERR("Failed to send data back to client"); | |
3946 | } | |
3947 | ||
d6e4fca4 | 3948 | /* End of transmission */ |
76d7553f MD |
3949 | ret = close(sock); |
3950 | if (ret) { | |
3951 | PERROR("close"); | |
3952 | } | |
3953 | sock = -1; | |
be040666 DG |
3954 | |
3955 | clean_command_ctx(&cmd_ctx); | |
1d4b027a DG |
3956 | } |
3957 | ||
3958 | error: | |
273ea72c | 3959 | DBG("Client thread dying"); |
273ea72c | 3960 | unlink(client_unix_sock_path); |
76d7553f MD |
3961 | if (client_sock >= 0) { |
3962 | ret = close(client_sock); | |
3963 | if (ret) { | |
3964 | PERROR("close"); | |
3965 | } | |
a4b35e07 MD |
3966 | } |
3967 | if (sock >= 0) { | |
76d7553f MD |
3968 | ret = close(sock); |
3969 | if (ret) { | |
3970 | PERROR("close"); | |
3971 | } | |
a4b35e07 | 3972 | } |
273ea72c | 3973 | |
5eb91c98 | 3974 | lttng_poll_clean(&events); |
a2fb29a5 | 3975 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3976 | |
3977 | rcu_unregister_thread(); | |
1d4b027a DG |
3978 | return NULL; |
3979 | } | |
3980 | ||
3981 | ||
fac6795d DG |
3982 | /* |
3983 | * usage function on stderr | |
3984 | */ | |
3985 | static void usage(void) | |
3986 | { | |
b716ce68 | 3987 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3988 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3989 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3990 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3991 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3992 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3993 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3994 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3995 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3996 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3997 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3998 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3999 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4000 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
4001 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
4002 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
4003 | fprintf(stderr, " -V, --version Show version number.\n"); | |
4004 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
4005 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
4006 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 4007 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4008 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
4009 | } |
4010 | ||
4011 | /* | |
4012 | * daemon argument parsing | |
4013 | */ | |
4014 | static int parse_args(int argc, char **argv) | |
4015 | { | |
4016 | int c; | |
4017 | ||
4018 | static struct option long_options[] = { | |
4019 | { "client-sock", 1, 0, 'c' }, | |
4020 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
4021 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
4022 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
4023 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
4024 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
4025 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
4026 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
4027 | { "consumerd32-path", 1, 0, 'u' }, | |
4028 | { "consumerd32-libdir", 1, 0, 'U' }, | |
4029 | { "consumerd64-path", 1, 0, 't' }, | |
4030 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 4031 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 4032 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
4033 | { "help", 0, 0, 'h' }, |
4034 | { "group", 1, 0, 'g' }, | |
4035 | { "version", 0, 0, 'V' }, | |
75462a81 | 4036 | { "quiet", 0, 0, 'q' }, |
3f9947db | 4037 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 4038 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 4039 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
4040 | { NULL, 0, 0, 0 } |
4041 | }; | |
4042 | ||
4043 | while (1) { | |
4044 | int option_index = 0; | |
4fba7219 | 4045 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 4046 | long_options, &option_index); |
fac6795d DG |
4047 | if (c == -1) { |
4048 | break; | |
4049 | } | |
4050 | ||
4051 | switch (c) { | |
4052 | case 0: | |
4053 | fprintf(stderr, "option %s", long_options[option_index].name); | |
4054 | if (optarg) { | |
4055 | fprintf(stderr, " with arg %s\n", optarg); | |
4056 | } | |
4057 | break; | |
b716ce68 | 4058 | case 'c': |
fac6795d DG |
4059 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
4060 | break; | |
4061 | case 'a': | |
4062 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
4063 | break; | |
4064 | case 'd': | |
4065 | opt_daemon = 1; | |
4066 | break; | |
4067 | case 'g': | |
fb09408a | 4068 | opt_tracing_group = optarg; |
fac6795d DG |
4069 | break; |
4070 | case 'h': | |
4071 | usage(); | |
4072 | exit(EXIT_FAILURE); | |
4073 | case 'V': | |
4074 | fprintf(stdout, "%s\n", VERSION); | |
4075 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
4076 | case 'S': |
4077 | opt_sig_parent = 1; | |
4078 | break; | |
d6f42150 | 4079 | case 'E': |
3bd1e081 | 4080 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
4081 | break; |
4082 | case 'C': | |
3bd1e081 MD |
4083 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4084 | break; | |
4085 | case 'F': | |
7753dea8 | 4086 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
4087 | break; |
4088 | case 'D': | |
7753dea8 MD |
4089 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
4090 | break; | |
4091 | case 'H': | |
4092 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
4093 | break; | |
4094 | case 'G': | |
4095 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4096 | break; |
4fba7219 DG |
4097 | case 'N': |
4098 | opt_no_kernel = 1; | |
4099 | break; | |
75462a81 | 4100 | case 'q': |
97e19046 | 4101 | lttng_opt_quiet = 1; |
75462a81 | 4102 | break; |
3f9947db | 4103 | case 'v': |
53086306 | 4104 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4105 | lttng_opt_verbose += 1; |
3f9947db | 4106 | break; |
31f73cc9 | 4107 | case 'Z': |
3bd1e081 | 4108 | opt_verbose_consumer += 1; |
31f73cc9 | 4109 | break; |
fb09408a | 4110 | case 'u': |
fc7a59ce | 4111 | consumerd32_bin= optarg; |
ebaeda94 MD |
4112 | break; |
4113 | case 'U': | |
4114 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4115 | break; |
4116 | case 't': | |
fc7a59ce | 4117 | consumerd64_bin = optarg; |
ebaeda94 MD |
4118 | break; |
4119 | case 'T': | |
4120 | consumerd64_libdir = optarg; | |
fb09408a | 4121 | break; |
fac6795d DG |
4122 | default: |
4123 | /* Unknown option or other error. | |
4124 | * Error is printed by getopt, just return */ | |
4125 | return -1; | |
4126 | } | |
4127 | } | |
4128 | ||
4129 | return 0; | |
4130 | } | |
4131 | ||
4132 | /* | |
d063d709 | 4133 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4134 | * apps_sock - The communication socket for all UST apps. |
4135 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4136 | */ |
cf3af59e | 4137 | static int init_daemon_socket(void) |
fac6795d DG |
4138 | { |
4139 | int ret = 0; | |
4140 | mode_t old_umask; | |
4141 | ||
4142 | old_umask = umask(0); | |
4143 | ||
4144 | /* Create client tool unix socket */ | |
d6f42150 DG |
4145 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4146 | if (client_sock < 0) { | |
4147 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4148 | ret = -1; |
4149 | goto end; | |
4150 | } | |
4151 | ||
4152 | /* File permission MUST be 660 */ | |
4153 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4154 | if (ret < 0) { | |
d6f42150 | 4155 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4156 | PERROR("chmod"); |
fac6795d DG |
4157 | goto end; |
4158 | } | |
4159 | ||
4160 | /* Create the application unix socket */ | |
d6f42150 DG |
4161 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4162 | if (apps_sock < 0) { | |
4163 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4164 | ret = -1; |
4165 | goto end; | |
4166 | } | |
4167 | ||
d6f42150 | 4168 | /* File permission MUST be 666 */ |
54d01ffb DG |
4169 | ret = chmod(apps_unix_sock_path, |
4170 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4171 | if (ret < 0) { |
d6f42150 | 4172 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4173 | PERROR("chmod"); |
fac6795d DG |
4174 | goto end; |
4175 | } | |
4176 | ||
4177 | end: | |
4178 | umask(old_umask); | |
4179 | return ret; | |
4180 | } | |
4181 | ||
4182 | /* | |
54d01ffb DG |
4183 | * Check if the global socket is available, and if a daemon is answering at the |
4184 | * other side. If yes, error is returned. | |
fac6795d | 4185 | */ |
cf3af59e | 4186 | static int check_existing_daemon(void) |
fac6795d | 4187 | { |
7d8234d9 | 4188 | /* Is there anybody out there ? */ |
099e26bd | 4189 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4190 | return -EEXIST; |
099e26bd | 4191 | } |
b09c7c76 DG |
4192 | |
4193 | return 0; | |
fac6795d DG |
4194 | } |
4195 | ||
fac6795d | 4196 | /* |
d063d709 | 4197 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4198 | * |
d063d709 | 4199 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4200 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4201 | */ |
be040666 | 4202 | static int set_permissions(char *rundir) |
fac6795d DG |
4203 | { |
4204 | int ret; | |
996b65c8 | 4205 | gid_t gid; |
fac6795d | 4206 | |
996b65c8 MD |
4207 | gid = allowed_group(); |
4208 | if (gid < 0) { | |
be040666 DG |
4209 | WARN("No tracing group detected"); |
4210 | ret = 0; | |
fac6795d DG |
4211 | goto end; |
4212 | } | |
4213 | ||
d6f42150 | 4214 | /* Set lttng run dir */ |
be040666 | 4215 | ret = chown(rundir, 0, gid); |
d6f42150 | 4216 | if (ret < 0) { |
be040666 | 4217 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4218 | PERROR("chown"); |
d6f42150 DG |
4219 | } |
4220 | ||
d1613cf5 | 4221 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4222 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4223 | if (ret < 0) { |
4224 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4225 | PERROR("chmod"); |
d1613cf5 JN |
4226 | } |
4227 | ||
d6f42150 | 4228 | /* lttng client socket path */ |
996b65c8 | 4229 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4230 | if (ret < 0) { |
d6f42150 | 4231 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4232 | PERROR("chown"); |
d6f42150 DG |
4233 | } |
4234 | ||
3bd1e081 MD |
4235 | /* kconsumer error socket path */ |
4236 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4237 | if (ret < 0) { |
3bd1e081 | 4238 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4239 | PERROR("chown"); |
3bd1e081 MD |
4240 | } |
4241 | ||
7753dea8 MD |
4242 | /* 64-bit ustconsumer error socket path */ |
4243 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4244 | if (ret < 0) { | |
4245 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4246 | PERROR("chown"); |
7753dea8 MD |
4247 | } |
4248 | ||
4249 | /* 32-bit ustconsumer compat32 error socket path */ | |
4250 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4251 | if (ret < 0) { |
7753dea8 | 4252 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4253 | PERROR("chown"); |
fac6795d DG |
4254 | } |
4255 | ||
d6f42150 | 4256 | DBG("All permissions are set"); |
e07ae692 | 4257 | |
fac6795d DG |
4258 | end: |
4259 | return ret; | |
4260 | } | |
4261 | ||
7a485870 | 4262 | /* |
d063d709 | 4263 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4264 | * Closed in cleanup(). |
7a485870 DG |
4265 | */ |
4266 | static int create_kernel_poll_pipe(void) | |
4267 | { | |
730389d9 DG |
4268 | int ret, i; |
4269 | ||
4270 | ret = pipe(kernel_poll_pipe); | |
4271 | if (ret < 0) { | |
4272 | PERROR("kernel poll pipe"); | |
4273 | goto error; | |
4274 | } | |
4275 | ||
4276 | for (i = 0; i < 2; i++) { | |
4277 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4278 | if (ret < 0) { | |
4279 | PERROR("fcntl kernel_poll_pipe"); | |
4280 | goto error; | |
4281 | } | |
4282 | } | |
4283 | ||
4284 | error: | |
4285 | return ret; | |
7a485870 DG |
4286 | } |
4287 | ||
099e26bd DG |
4288 | /* |
4289 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4290 | * Closed in cleanup(). |
099e26bd DG |
4291 | */ |
4292 | static int create_apps_cmd_pipe(void) | |
4293 | { | |
730389d9 DG |
4294 | int ret, i; |
4295 | ||
4296 | ret = pipe(apps_cmd_pipe); | |
4297 | if (ret < 0) { | |
4298 | PERROR("apps cmd pipe"); | |
4299 | goto error; | |
4300 | } | |
4301 | ||
4302 | for (i = 0; i < 2; i++) { | |
4303 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4304 | if (ret < 0) { | |
4305 | PERROR("fcntl apps_cmd_pipe"); | |
4306 | goto error; | |
4307 | } | |
4308 | } | |
4309 | ||
4310 | error: | |
4311 | return ret; | |
099e26bd DG |
4312 | } |
4313 | ||
d6f42150 | 4314 | /* |
d063d709 | 4315 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4316 | */ |
67e40797 | 4317 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4318 | { |
4319 | int ret; | |
4320 | ||
67e40797 DG |
4321 | DBG3("Creating LTTng run directory: %s", rundir); |
4322 | ||
d1613cf5 | 4323 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4324 | if (ret < 0) { |
b1f11e69 | 4325 | if (errno != EEXIST) { |
67e40797 | 4326 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4327 | goto error; |
4328 | } else { | |
4329 | ret = 0; | |
4330 | } | |
d6f42150 DG |
4331 | } |
4332 | ||
4333 | error: | |
4334 | return ret; | |
4335 | } | |
4336 | ||
4337 | /* | |
d063d709 DG |
4338 | * Setup sockets and directory needed by the kconsumerd communication with the |
4339 | * session daemon. | |
d6f42150 | 4340 | */ |
67e40797 DG |
4341 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4342 | const char *rundir) | |
d6f42150 DG |
4343 | { |
4344 | int ret; | |
67e40797 | 4345 | char path[PATH_MAX]; |
d6f42150 | 4346 | |
67e40797 | 4347 | switch (consumer_data->type) { |
7753dea8 | 4348 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4349 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4350 | break; |
4351 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4352 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4353 | break; |
4354 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4355 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4356 | break; |
4357 | default: | |
4358 | ERR("Consumer type unknown"); | |
4359 | ret = -EINVAL; | |
4360 | goto error; | |
d6f42150 DG |
4361 | } |
4362 | ||
67e40797 DG |
4363 | DBG2("Creating consumer directory: %s", path); |
4364 | ||
d1613cf5 | 4365 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4366 | if (ret < 0) { |
6beb2242 | 4367 | if (errno != EEXIST) { |
f11e84c2 | 4368 | PERROR("mkdir"); |
3bd1e081 | 4369 | ERR("Failed to create %s", path); |
6beb2242 DG |
4370 | goto error; |
4371 | } | |
f11e84c2 | 4372 | ret = -1; |
d6f42150 DG |
4373 | } |
4374 | ||
4375 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4376 | consumer_data->err_sock = |
4377 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4378 | if (consumer_data->err_sock < 0) { | |
4379 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4380 | ret = -1; |
4381 | goto error; | |
4382 | } | |
4383 | ||
4384 | /* File permission MUST be 660 */ | |
3bd1e081 | 4385 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4386 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4387 | if (ret < 0) { |
3bd1e081 | 4388 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4389 | PERROR("chmod"); |
d6f42150 DG |
4390 | goto error; |
4391 | } | |
4392 | ||
4393 | error: | |
4394 | return ret; | |
4395 | } | |
4396 | ||
fac6795d | 4397 | /* |
d063d709 | 4398 | * Signal handler for the daemon |
cf3af59e | 4399 | * |
54d01ffb DG |
4400 | * Simply stop all worker threads, leaving main() return gracefully after |
4401 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4402 | */ |
4403 | static void sighandler(int sig) | |
4404 | { | |
4405 | switch (sig) { | |
cf3af59e | 4406 | case SIGPIPE: |
af87c45a | 4407 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4408 | return; |
4409 | case SIGINT: | |
af87c45a | 4410 | DBG("SIGINT caught"); |
cf3af59e MD |
4411 | stop_threads(); |
4412 | break; | |
4413 | case SIGTERM: | |
af87c45a | 4414 | DBG("SIGTERM caught"); |
cf3af59e MD |
4415 | stop_threads(); |
4416 | break; | |
4417 | default: | |
4418 | break; | |
fac6795d | 4419 | } |
fac6795d DG |
4420 | } |
4421 | ||
4422 | /* | |
d063d709 | 4423 | * Setup signal handler for : |
1d4b027a | 4424 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4425 | */ |
1d4b027a | 4426 | static int set_signal_handler(void) |
fac6795d | 4427 | { |
1d4b027a DG |
4428 | int ret = 0; |
4429 | struct sigaction sa; | |
4430 | sigset_t sigset; | |
fac6795d | 4431 | |
1d4b027a | 4432 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4433 | PERROR("sigemptyset"); |
1d4b027a DG |
4434 | return ret; |
4435 | } | |
d6f42150 | 4436 | |
1d4b027a DG |
4437 | sa.sa_handler = sighandler; |
4438 | sa.sa_mask = sigset; | |
4439 | sa.sa_flags = 0; | |
4440 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4441 | PERROR("sigaction"); |
1d4b027a | 4442 | return ret; |
d6f42150 DG |
4443 | } |
4444 | ||
1d4b027a | 4445 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4446 | PERROR("sigaction"); |
1d4b027a | 4447 | return ret; |
d6f42150 | 4448 | } |
aaf26714 | 4449 | |
1d4b027a | 4450 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4451 | PERROR("sigaction"); |
1d4b027a | 4452 | return ret; |
8c0faa1d DG |
4453 | } |
4454 | ||
1d4b027a DG |
4455 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4456 | ||
4457 | return ret; | |
fac6795d DG |
4458 | } |
4459 | ||
f3ed775e | 4460 | /* |
d063d709 DG |
4461 | * Set open files limit to unlimited. This daemon can open a large number of |
4462 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4463 | */ |
4464 | static void set_ulimit(void) | |
4465 | { | |
4466 | int ret; | |
4467 | struct rlimit lim; | |
4468 | ||
a88df331 | 4469 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4470 | lim.rlim_cur = 65535; |
4471 | lim.rlim_max = 65535; | |
4472 | ||
4473 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4474 | if (ret < 0) { | |
76d7553f | 4475 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4476 | } |
4477 | } | |
4478 | ||
fac6795d DG |
4479 | /* |
4480 | * main | |
4481 | */ | |
4482 | int main(int argc, char **argv) | |
4483 | { | |
fac6795d DG |
4484 | int ret = 0; |
4485 | void *status; | |
b082db07 | 4486 | const char *home_path; |
fac6795d | 4487 | |
b25a8868 | 4488 | tracepoint(sessiond_boot_start); |
7bb1478a | 4489 | |
335a95b7 MD |
4490 | init_kernel_workarounds(); |
4491 | ||
f6a9efaa | 4492 | rcu_register_thread(); |
b25a8868 | 4493 | |
273ea72c | 4494 | /* Create thread quit pipe */ |
cf3af59e MD |
4495 | if ((ret = init_thread_quit_pipe()) < 0) { |
4496 | goto error; | |
273ea72c DG |
4497 | } |
4498 | ||
7753dea8 | 4499 | setup_consumerd_path(); |
fb09408a | 4500 | |
fac6795d DG |
4501 | /* Parse arguments */ |
4502 | progname = argv[0]; | |
4503 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4504 | goto error; |
fac6795d DG |
4505 | } |
4506 | ||
4507 | /* Daemonize */ | |
4508 | if (opt_daemon) { | |
53094c05 DG |
4509 | ret = daemon(0, 0); |
4510 | if (ret < 0) { | |
76d7553f | 4511 | PERROR("daemon"); |
cf3af59e | 4512 | goto error; |
53094c05 | 4513 | } |
fac6795d DG |
4514 | } |
4515 | ||
4516 | /* Check if daemon is UID = 0 */ | |
4517 | is_root = !getuid(); | |
4518 | ||
fac6795d | 4519 | if (is_root) { |
990570ed | 4520 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4521 | |
4522 | /* Create global run dir with root access */ | |
4523 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4524 | if (ret < 0) { |
cf3af59e | 4525 | goto error; |
d6f42150 DG |
4526 | } |
4527 | ||
fac6795d | 4528 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4529 | snprintf(apps_unix_sock_path, PATH_MAX, |
4530 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4531 | } |
4532 | ||
4533 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4534 | snprintf(client_unix_sock_path, PATH_MAX, |
4535 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4536 | } | |
0fdd1e2c DG |
4537 | |
4538 | /* Set global SHM for ust */ | |
4539 | if (strlen(wait_shm_path) == 0) { | |
4540 | snprintf(wait_shm_path, PATH_MAX, | |
4541 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4542 | } | |
67e40797 DG |
4543 | |
4544 | /* Setup kernel consumerd path */ | |
4545 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4546 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4547 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4548 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4549 | |
4550 | DBG2("Kernel consumer err path: %s", | |
4551 | kconsumer_data.err_unix_sock_path); | |
4552 | DBG2("Kernel consumer cmd path: %s", | |
4553 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4554 | } else { |
b082db07 DG |
4555 | home_path = get_home_dir(); |
4556 | if (home_path == NULL) { | |
273ea72c DG |
4557 | /* TODO: Add --socket PATH option */ |
4558 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4559 | ret = -EPERM; |
4560 | goto error; | |
b082db07 DG |
4561 | } |
4562 | ||
67e40797 DG |
4563 | /* |
4564 | * Create rundir from home path. This will create something like | |
4565 | * $HOME/.lttng | |
4566 | */ | |
990570ed | 4567 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4568 | if (ret < 0) { |
4569 | ret = -ENOMEM; | |
4570 | goto error; | |
4571 | } | |
4572 | ||
4573 | ret = create_lttng_rundir(rundir); | |
4574 | if (ret < 0) { | |
4575 | goto error; | |
4576 | } | |
4577 | ||
fac6795d | 4578 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4579 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4580 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4581 | } |
4582 | ||
4583 | /* Set the cli tool unix socket path */ | |
4584 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4585 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4586 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4587 | } |
0fdd1e2c DG |
4588 | |
4589 | /* Set global SHM for ust */ | |
4590 | if (strlen(wait_shm_path) == 0) { | |
4591 | snprintf(wait_shm_path, PATH_MAX, | |
4592 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4593 | } | |
fac6795d DG |
4594 | } |
4595 | ||
847177cd DG |
4596 | DBG("Client socket path %s", client_unix_sock_path); |
4597 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4598 | DBG("LTTng run directory path: %s", rundir); |
4599 | ||
4600 | /* 32 bits consumerd path setup */ | |
4601 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4602 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4603 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4604 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4605 | |
4606 | DBG2("UST consumer 32 bits err path: %s", | |
4607 | ustconsumer32_data.err_unix_sock_path); | |
4608 | DBG2("UST consumer 32 bits cmd path: %s", | |
4609 | ustconsumer32_data.cmd_unix_sock_path); | |
4610 | ||
4611 | /* 64 bits consumerd path setup */ | |
4612 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4613 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4614 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4615 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4616 | |
4617 | DBG2("UST consumer 64 bits err path: %s", | |
4618 | ustconsumer64_data.err_unix_sock_path); | |
4619 | DBG2("UST consumer 64 bits cmd path: %s", | |
4620 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4621 | |
273ea72c | 4622 | /* |
7d8234d9 | 4623 | * See if daemon already exist. |
fac6795d | 4624 | */ |
7d8234d9 | 4625 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4626 | ERR("Already running daemon.\n"); |
273ea72c | 4627 | /* |
cf3af59e MD |
4628 | * We do not goto exit because we must not cleanup() |
4629 | * because a daemon is already running. | |
ab118b20 | 4630 | */ |
cf3af59e | 4631 | goto error; |
a88df331 DG |
4632 | } |
4633 | ||
1427f9b2 DG |
4634 | /* |
4635 | * Init UST app hash table. Alloc hash table before this point since | |
4636 | * cleanup() can get called after that point. | |
4637 | */ | |
4638 | ust_app_ht_alloc(); | |
4639 | ||
54d01ffb | 4640 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4641 | |
4642 | /* | |
4643 | * These actions must be executed as root. We do that *after* setting up | |
4644 | * the sockets path because we MUST make the check for another daemon using | |
4645 | * those paths *before* trying to set the kernel consumer sockets and init | |
4646 | * kernel tracer. | |
4647 | */ | |
4648 | if (is_root) { | |
67e40797 | 4649 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4650 | if (ret < 0) { |
4651 | goto exit; | |
4652 | } | |
4653 | ||
a88df331 | 4654 | /* Setup kernel tracer */ |
4fba7219 DG |
4655 | if (!opt_no_kernel) { |
4656 | init_kernel_tracer(); | |
4657 | } | |
a88df331 DG |
4658 | |
4659 | /* Set ulimit for open files */ | |
4660 | set_ulimit(); | |
fac6795d | 4661 | } |
4063050c MD |
4662 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4663 | lttng_fd_init(); | |
fac6795d | 4664 | |
67e40797 DG |
4665 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4666 | if (ret < 0) { | |
4667 | goto exit; | |
4668 | } | |
4669 | ||
4670 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4671 | if (ret < 0) { | |
4672 | goto exit; | |
4673 | } | |
4674 | ||
cf3af59e MD |
4675 | if ((ret = set_signal_handler()) < 0) { |
4676 | goto exit; | |
fac6795d DG |
4677 | } |
4678 | ||
d6f42150 | 4679 | /* Setup the needed unix socket */ |
cf3af59e MD |
4680 | if ((ret = init_daemon_socket()) < 0) { |
4681 | goto exit; | |
fac6795d DG |
4682 | } |
4683 | ||
4684 | /* Set credentials to socket */ | |
be040666 | 4685 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4686 | goto exit; |
fac6795d DG |
4687 | } |
4688 | ||
5b8719f5 DG |
4689 | /* Get parent pid if -S, --sig-parent is specified. */ |
4690 | if (opt_sig_parent) { | |
4691 | ppid = getppid(); | |
4692 | } | |
4693 | ||
7a485870 | 4694 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4695 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4696 | goto exit; | |
7a485870 DG |
4697 | } |
4698 | ||
099e26bd DG |
4699 | /* Setup the thread apps communication pipe. */ |
4700 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4701 | goto exit; | |
4702 | } | |
4703 | ||
4704 | /* Init UST command queue. */ | |
4705 | cds_wfq_init(&ust_cmd_queue.queue); | |
4706 | ||
273ea72c | 4707 | /* |
54d01ffb DG |
4708 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4709 | * statically declared in session.c | |
273ea72c | 4710 | */ |
54d01ffb | 4711 | session_list_ptr = session_get_list(); |
b5541356 | 4712 | |
5eb91c98 DG |
4713 | /* Set up max poll set size */ |
4714 | lttng_poll_set_max_size(); | |
4715 | ||
902c9922 DG |
4716 | bench_init(); |
4717 | ||
cf3af59e | 4718 | /* Create thread to manage the client socket */ |
099e26bd DG |
4719 | ret = pthread_create(&client_thread, NULL, |
4720 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4721 | if (ret != 0) { |
76d7553f | 4722 | PERROR("pthread_create clients"); |
cf3af59e MD |
4723 | goto exit_client; |
4724 | } | |
fac6795d | 4725 | |
099e26bd DG |
4726 | /* Create thread to dispatch registration */ |
4727 | ret = pthread_create(&dispatch_thread, NULL, | |
4728 | thread_dispatch_ust_registration, (void *) NULL); | |
4729 | if (ret != 0) { | |
76d7553f | 4730 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4731 | goto exit_dispatch; |
4732 | } | |
4733 | ||
4734 | /* Create thread to manage application registration. */ | |
4735 | ret = pthread_create(®_apps_thread, NULL, | |
4736 | thread_registration_apps, (void *) NULL); | |
4737 | if (ret != 0) { | |
76d7553f | 4738 | PERROR("pthread_create registration"); |
099e26bd DG |
4739 | goto exit_reg_apps; |
4740 | } | |
4741 | ||
cf3af59e | 4742 | /* Create thread to manage application socket */ |
54d01ffb DG |
4743 | ret = pthread_create(&apps_thread, NULL, |
4744 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4745 | if (ret != 0) { |
76d7553f | 4746 | PERROR("pthread_create apps"); |
cf3af59e MD |
4747 | goto exit_apps; |
4748 | } | |
fac6795d | 4749 | |
cf3af59e | 4750 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4751 | ret = pthread_create(&kernel_thread, NULL, |
4752 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4753 | if (ret != 0) { |
76d7553f | 4754 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4755 | goto exit_kernel; |
4756 | } | |
7a485870 | 4757 | |
b25a8868 DG |
4758 | tracepoint(sessiond_boot_end); |
4759 | ||
cf3af59e MD |
4760 | ret = pthread_join(kernel_thread, &status); |
4761 | if (ret != 0) { | |
76d7553f | 4762 | PERROR("pthread_join"); |
cf3af59e | 4763 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4764 | } |
4765 | ||
cf3af59e MD |
4766 | exit_kernel: |
4767 | ret = pthread_join(apps_thread, &status); | |
4768 | if (ret != 0) { | |
76d7553f | 4769 | PERROR("pthread_join"); |
cf3af59e MD |
4770 | goto error; /* join error, exit without cleanup */ |
4771 | } | |
fac6795d | 4772 | |
cf3af59e | 4773 | exit_apps: |
099e26bd DG |
4774 | ret = pthread_join(reg_apps_thread, &status); |
4775 | if (ret != 0) { | |
76d7553f | 4776 | PERROR("pthread_join"); |
099e26bd DG |
4777 | goto error; /* join error, exit without cleanup */ |
4778 | } | |
4779 | ||
4780 | exit_reg_apps: | |
4781 | ret = pthread_join(dispatch_thread, &status); | |
4782 | if (ret != 0) { | |
76d7553f | 4783 | PERROR("pthread_join"); |
099e26bd DG |
4784 | goto error; /* join error, exit without cleanup */ |
4785 | } | |
4786 | ||
4787 | exit_dispatch: | |
cf3af59e MD |
4788 | ret = pthread_join(client_thread, &status); |
4789 | if (ret != 0) { | |
76d7553f | 4790 | PERROR("pthread_join"); |
cf3af59e MD |
4791 | goto error; /* join error, exit without cleanup */ |
4792 | } | |
4793 | ||
3bd1e081 | 4794 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4795 | if (ret != 0) { |
76d7553f | 4796 | PERROR("join_consumer"); |
cf3af59e MD |
4797 | goto error; /* join error, exit without cleanup */ |
4798 | } | |
a88df331 | 4799 | |
cf3af59e | 4800 | exit_client: |
a88df331 | 4801 | exit: |
cf3af59e MD |
4802 | /* |
4803 | * cleanup() is called when no other thread is running. | |
4804 | */ | |
f6a9efaa | 4805 | rcu_thread_online(); |
cf3af59e | 4806 | cleanup(); |
f6a9efaa DG |
4807 | rcu_thread_offline(); |
4808 | rcu_unregister_thread(); | |
67e40797 | 4809 | if (!ret) { |
cf3af59e | 4810 | exit(EXIT_SUCCESS); |
67e40797 | 4811 | } |
cf3af59e | 4812 | error: |
5e16da05 | 4813 | exit(EXIT_FAILURE); |
fac6795d | 4814 | } |