Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
b579acd9 | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
4771f025 | 53 | #include "kernel.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
3bd1e081 MD |
62 | struct consumer_data { |
63 | enum lttng_consumer_type type; | |
64 | ||
65 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
66 | sem_t sem; | |
67 | ||
68 | /* Mutex to control consumerd pid assignation */ | |
69 | pthread_mutex_t pid_mutex; | |
70 | pid_t pid; | |
71 | ||
72 | int err_sock; | |
73 | int cmd_sock; | |
74 | ||
75 | /* consumer error and command Unix socket path */ | |
76 | char err_unix_sock_path[PATH_MAX]; | |
77 | char cmd_unix_sock_path[PATH_MAX]; | |
78 | }; | |
fac6795d | 79 | |
b25a8868 DG |
80 | #include "benchmark.h" |
81 | ||
75462a81 | 82 | /* Const values */ |
686204ab | 83 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 84 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
85 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
86 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
87 | ||
fac6795d | 88 | /* Variables */ |
1d4b027a | 89 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 90 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 91 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 92 | |
fac6795d DG |
93 | const char *progname; |
94 | const char *opt_tracing_group; | |
5b8719f5 | 95 | static int opt_sig_parent; |
fac6795d DG |
96 | static int opt_daemon; |
97 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 98 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
99 | |
100 | /* Consumer daemon specific control data */ | |
101 | static struct consumer_data kconsumer_data = { | |
102 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
103 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
104 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 105 | }; |
7753dea8 MD |
106 | static struct consumer_data ustconsumer64_data = { |
107 | .type = LTTNG_CONSUMER64_UST, | |
108 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
109 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
3bd1e081 | 110 | }; |
7753dea8 MD |
111 | static struct consumer_data ustconsumer32_data = { |
112 | .type = LTTNG_CONSUMER32_UST, | |
113 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
114 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
115 | }; |
116 | ||
099e26bd | 117 | static int dispatch_thread_exit; |
fac6795d | 118 | |
54d01ffb DG |
119 | /* Global application Unix socket path */ |
120 | static char apps_unix_sock_path[PATH_MAX]; | |
121 | /* Global client Unix socket path */ | |
122 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
123 | /* global wait shm path for UST */ |
124 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 125 | |
1d4b027a | 126 | /* Sockets and FDs */ |
d6f42150 DG |
127 | static int client_sock; |
128 | static int apps_sock; | |
20fe2104 | 129 | static int kernel_tracer_fd; |
7a485870 | 130 | static int kernel_poll_pipe[2]; |
1d4b027a | 131 | |
273ea72c DG |
132 | /* |
133 | * Quit pipe for all threads. This permits a single cancellation point | |
134 | * for all threads when receiving an event on the pipe. | |
135 | */ | |
136 | static int thread_quit_pipe[2]; | |
137 | ||
099e26bd DG |
138 | /* |
139 | * This pipe is used to inform the thread managing application communication | |
140 | * that a command is queued and ready to be processed. | |
141 | */ | |
142 | static int apps_cmd_pipe[2]; | |
143 | ||
1d4b027a | 144 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 145 | static pthread_t apps_thread; |
099e26bd | 146 | static pthread_t reg_apps_thread; |
1d4b027a | 147 | static pthread_t client_thread; |
7a485870 | 148 | static pthread_t kernel_thread; |
099e26bd | 149 | static pthread_t dispatch_thread; |
5eb91c98 | 150 | |
fac6795d | 151 | |
099e26bd DG |
152 | /* |
153 | * UST registration command queue. This queue is tied with a futex and uses a N | |
154 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
155 | * | |
156 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
157 | * this queue and the wait/wake scheme. | |
158 | */ | |
159 | static struct ust_cmd_queue ust_cmd_queue; | |
160 | ||
b5541356 DG |
161 | /* |
162 | * Pointer initialized before thread creation. | |
163 | * | |
164 | * This points to the tracing session list containing the session count and a | |
165 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
166 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 167 | * |
d063d709 | 168 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 169 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
170 | */ |
171 | static struct ltt_session_list *session_list_ptr; | |
172 | ||
7753dea8 MD |
173 | int ust_consumerd64_fd = -1; |
174 | int ust_consumerd32_fd = -1; | |
175 | ||
ebaeda94 MD |
176 | static const char *consumerd32_path = |
177 | __stringify(CONFIG_CONSUMERD32_PATH); | |
178 | static const char *consumerd64_path = | |
179 | __stringify(CONFIG_CONSUMERD64_PATH); | |
180 | static const char *consumerd32_libdir = | |
181 | __stringify(CONFIG_CONSUMERD32_LIBDIR); | |
182 | static const char *consumerd64_libdir = | |
183 | __stringify(CONFIG_CONSUMERD64_LIBDIR); | |
fb09408a MD |
184 | |
185 | static | |
7753dea8 | 186 | void setup_consumerd_path(void) |
fb09408a | 187 | { |
ebaeda94 | 188 | const char *path, *libdir; |
fb09408a | 189 | |
7753dea8 MD |
190 | /* |
191 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
192 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
193 | * has not been defined. | |
7753dea8 | 194 | */ |
ebaeda94 MD |
195 | #if (CAA_BITS_PER_LONG == 32) |
196 | if (!consumerd32_path[0]) { | |
7745933c | 197 | consumerd32_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
ebaeda94 MD |
198 | } |
199 | if (!consumerd32_libdir[0]) { | |
200 | consumerd32_libdir = INSTALL_LIB_PATH; | |
201 | } | |
202 | #elif (CAA_BITS_PER_LONG == 64) | |
203 | if (!consumerd64_path[0]) { | |
204 | consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 205 | } |
ebaeda94 MD |
206 | if (!consumerd64_libdir[0]) { |
207 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
208 | } |
209 | #else | |
210 | #error "Unknown bitness" | |
211 | #endif | |
212 | ||
fb09408a MD |
213 | /* |
214 | * runtime env. var. overrides the build default. | |
215 | */ | |
ebaeda94 MD |
216 | path = getenv("LTTNG_CONSUMERD32_PATH"); |
217 | if (path) { | |
218 | consumerd32_path = path; | |
7753dea8 | 219 | } |
ebaeda94 MD |
220 | path = getenv("LTTNG_CONSUMERD64_PATH"); |
221 | if (path) { | |
222 | consumerd64_path = path; | |
223 | } | |
224 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
225 | if (libdir) { | |
226 | consumerd32_libdir = libdir; | |
227 | } | |
228 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
229 | if (libdir) { | |
230 | consumerd64_libdir = libdir; | |
fb09408a MD |
231 | } |
232 | } | |
233 | ||
5eb91c98 DG |
234 | /* |
235 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
236 | */ | |
237 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
238 | unsigned int size) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (events == NULL || size == 0) { | |
243 | ret = -1; | |
244 | goto error; | |
245 | } | |
246 | ||
247 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
248 | if (ret < 0) { | |
249 | goto error; | |
250 | } | |
251 | ||
252 | /* Add quit pipe */ | |
253 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
254 | if (ret < 0) { | |
255 | goto error; | |
256 | } | |
257 | ||
258 | return 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Check if the thread quit pipe was triggered. | |
266 | * | |
267 | * Return 1 if it was triggered else 0; | |
268 | */ | |
269 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
270 | { | |
271 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
272 | return 1; | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
0fdd1e2c DG |
278 | /* |
279 | * Remove modules in reverse load order. | |
280 | */ | |
281 | static int modprobe_remove_kernel_modules(void) | |
282 | { | |
283 | int ret = 0, i; | |
284 | char modprobe[256]; | |
285 | ||
286 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
287 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 288 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
289 | kernel_modules_list[i].name); |
290 | if (ret < 0) { | |
24b487b8 | 291 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
292 | goto error; |
293 | } | |
294 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
295 | ret = system(modprobe); | |
296 | if (ret == -1) { | |
24b487b8 | 297 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
298 | kernel_modules_list[i].name); |
299 | } else if (kernel_modules_list[i].required | |
300 | && WEXITSTATUS(ret) != 0) { | |
301 | ERR("Unable to remove module %s", | |
302 | kernel_modules_list[i].name); | |
303 | } else { | |
304 | DBG("Modprobe removal successful %s", | |
305 | kernel_modules_list[i].name); | |
306 | } | |
307 | } | |
308 | ||
309 | error: | |
310 | return ret; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Return group ID of the tracing group or -1 if not found. | |
315 | */ | |
996b65c8 MD |
316 | static gid_t allowed_group(void) |
317 | { | |
318 | struct group *grp; | |
319 | ||
274e143b MD |
320 | if (opt_tracing_group) { |
321 | grp = getgrnam(opt_tracing_group); | |
322 | } else { | |
323 | grp = getgrnam(default_tracing_group); | |
324 | } | |
996b65c8 MD |
325 | if (!grp) { |
326 | return -1; | |
327 | } else { | |
328 | return grp->gr_gid; | |
329 | } | |
330 | } | |
331 | ||
273ea72c | 332 | /* |
5eb91c98 | 333 | * Init thread quit pipe. |
273ea72c DG |
334 | * |
335 | * Return -1 on error or 0 if all pipes are created. | |
336 | */ | |
337 | static int init_thread_quit_pipe(void) | |
338 | { | |
339 | int ret; | |
340 | ||
341 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
342 | if (ret < 0) { | |
343 | perror("thread quit pipe"); | |
344 | goto error; | |
345 | } | |
346 | ||
347 | error: | |
348 | return ret; | |
349 | } | |
350 | ||
fac6795d | 351 | /* |
d063d709 DG |
352 | * Complete teardown of a kernel session. This free all data structure related |
353 | * to a kernel session and update counter. | |
fac6795d | 354 | */ |
1d4b027a | 355 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 356 | { |
8f7a84dd DG |
357 | if (!session->kernel_session) { |
358 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 359 | return; |
8f7a84dd | 360 | } |
d9800920 | 361 | |
84ea9c99 | 362 | DBG("Tearing down kernel session"); |
d9800920 | 363 | |
84ea9c99 MD |
364 | /* |
365 | * If a custom kernel consumer was registered, close the socket before | |
366 | * tearing down the complete kernel session structure | |
367 | */ | |
368 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
369 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 370 | } |
84ea9c99 MD |
371 | |
372 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
373 | } |
374 | ||
f6a9efaa DG |
375 | /* |
376 | * Complete teardown of all UST sessions. This will free everything on his path | |
377 | * and destroy the core essence of all ust sessions :) | |
378 | */ | |
379 | static void teardown_ust_session(struct ltt_session *session) | |
380 | { | |
84cd17c6 MD |
381 | int ret; |
382 | ||
8f7a84dd DG |
383 | if (!session->ust_session) { |
384 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 385 | return; |
8f7a84dd DG |
386 | } |
387 | ||
f6a9efaa DG |
388 | DBG("Tearing down UST session(s)"); |
389 | ||
84cd17c6 MD |
390 | ret = ust_app_destroy_trace_all(session->ust_session); |
391 | if (ret) { | |
392 | ERR("Error in ust_app_destroy_trace_all"); | |
393 | } | |
8f7a84dd | 394 | |
f6a9efaa DG |
395 | trace_ust_destroy_session(session->ust_session); |
396 | } | |
397 | ||
099e26bd DG |
398 | /* |
399 | * Stop all threads by closing the thread quit pipe. | |
400 | */ | |
cf3af59e MD |
401 | static void stop_threads(void) |
402 | { | |
5eb91c98 DG |
403 | int ret; |
404 | ||
cf3af59e MD |
405 | /* Stopping all threads */ |
406 | DBG("Terminating all threads"); | |
54d01ffb | 407 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
408 | if (ret < 0) { |
409 | ERR("write error on thread quit pipe"); | |
410 | } | |
411 | ||
099e26bd DG |
412 | /* Dispatch thread */ |
413 | dispatch_thread_exit = 1; | |
414 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
415 | } |
416 | ||
fac6795d | 417 | /* |
d063d709 | 418 | * Cleanup the daemon |
fac6795d | 419 | */ |
cf3af59e | 420 | static void cleanup(void) |
fac6795d | 421 | { |
1d4b027a DG |
422 | int ret; |
423 | char *cmd; | |
af9737e9 | 424 | struct ltt_session *sess, *stmp; |
fac6795d | 425 | |
1d4b027a | 426 | DBG("Cleaning up"); |
e07ae692 | 427 | |
5eb91c98 DG |
428 | if (is_root) { |
429 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
430 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
431 | if (ret < 0) { | |
432 | ERR("asprintf failed. Something is really wrong!"); | |
433 | } | |
5461b305 | 434 | |
5eb91c98 DG |
435 | /* Remove lttng run directory */ |
436 | ret = system(cmd); | |
437 | if (ret < 0) { | |
438 | ERR("Unable to clean " LTTNG_RUNDIR); | |
439 | } | |
1d4b027a | 440 | } |
5461b305 | 441 | |
1d4b027a | 442 | DBG("Cleaning up all session"); |
fac6795d | 443 | |
b5541356 | 444 | /* Destroy session list mutex */ |
273ea72c DG |
445 | if (session_list_ptr != NULL) { |
446 | pthread_mutex_destroy(&session_list_ptr->lock); | |
447 | ||
448 | /* Cleanup ALL session */ | |
54d01ffb DG |
449 | cds_list_for_each_entry_safe(sess, stmp, |
450 | &session_list_ptr->head, list) { | |
273ea72c | 451 | teardown_kernel_session(sess); |
f6a9efaa DG |
452 | teardown_ust_session(sess); |
453 | free(sess); | |
273ea72c DG |
454 | } |
455 | } | |
456 | ||
099e26bd | 457 | DBG("Closing all UST sockets"); |
56fff090 | 458 | ust_app_clean_list(); |
099e26bd | 459 | |
3bd1e081 | 460 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 461 | |
f3ed775e | 462 | DBG("Closing kernel fd"); |
1d4b027a | 463 | close(kernel_tracer_fd); |
ab147185 | 464 | |
2f50c8a3 DG |
465 | if (is_root) { |
466 | DBG("Unloading kernel modules"); | |
467 | modprobe_remove_kernel_modules(); | |
468 | } | |
b25a8868 | 469 | |
5eb91c98 DG |
470 | close(thread_quit_pipe[0]); |
471 | close(thread_quit_pipe[1]); | |
dab4c8a1 | 472 | |
3c6bae61 DG |
473 | /* OUTPUT BENCHMARK RESULTS */ |
474 | bench_init(); | |
475 | ||
62d53818 DG |
476 | if (getenv("BENCH_UST_NOTIFY")) { |
477 | bench_print_ust_notification(); | |
478 | } | |
479 | ||
480 | if (getenv("BENCH_UST_REGISTER")) { | |
481 | bench_print_ust_register(); | |
ccca3fea | 482 | bench_print_ust_unregister(); |
62d53818 DG |
483 | } |
484 | ||
485 | if (getenv("BENCH_BOOT_PROCESS")) { | |
486 | bench_print_boot_process(); | |
487 | } | |
3c6bae61 DG |
488 | |
489 | bench_close(); | |
490 | /* END BENCHMARK */ | |
bb3037a9 | 491 | |
421cb601 DG |
492 | /* <fun> */ |
493 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
494 | "Matthew, BEET driven development works!%c[%dm", | |
495 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
496 | /* </fun> */ | |
fac6795d DG |
497 | } |
498 | ||
e065084a | 499 | /* |
d063d709 | 500 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 501 | * |
d063d709 | 502 | * Return lttcomm error code. |
e065084a DG |
503 | */ |
504 | static int send_unix_sock(int sock, void *buf, size_t len) | |
505 | { | |
506 | /* Check valid length */ | |
507 | if (len <= 0) { | |
508 | return -1; | |
509 | } | |
510 | ||
511 | return lttcomm_send_unix_sock(sock, buf, len); | |
512 | } | |
513 | ||
5461b305 | 514 | /* |
d063d709 | 515 | * Free memory of a command context structure. |
5461b305 | 516 | */ |
a2fb29a5 | 517 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 518 | { |
a2fb29a5 DG |
519 | DBG("Clean command context structure"); |
520 | if (*cmd_ctx) { | |
521 | if ((*cmd_ctx)->llm) { | |
522 | free((*cmd_ctx)->llm); | |
5461b305 | 523 | } |
a2fb29a5 DG |
524 | if ((*cmd_ctx)->lsm) { |
525 | free((*cmd_ctx)->lsm); | |
5461b305 | 526 | } |
a2fb29a5 DG |
527 | free(*cmd_ctx); |
528 | *cmd_ctx = NULL; | |
5461b305 DG |
529 | } |
530 | } | |
531 | ||
f3ed775e | 532 | /* |
d063d709 | 533 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 534 | */ |
2bdd86d4 | 535 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 536 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
537 | { |
538 | int ret; | |
f3ed775e | 539 | struct ltt_kernel_stream *stream; |
3bd1e081 | 540 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 541 | |
3bd1e081 | 542 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 543 | channel->channel->name); |
7a485870 | 544 | |
3bd1e081 MD |
545 | /* Send channel */ |
546 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
547 | lkm.u.channel.channel_key = channel->fd; | |
548 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
549 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 550 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 551 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 552 | if (ret < 0) { |
3bd1e081 | 553 | perror("send consumer channel"); |
f3ed775e DG |
554 | goto error; |
555 | } | |
556 | ||
3bd1e081 | 557 | /* Send streams */ |
7a485870 | 558 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
559 | if (!stream->fd) { |
560 | continue; | |
561 | } | |
562 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
563 | lkm.u.stream.channel_key = channel->fd; | |
564 | lkm.u.stream.stream_key = stream->fd; | |
565 | lkm.u.stream.state = stream->state; | |
566 | lkm.u.stream.output = channel->channel->attr.output; | |
567 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
568 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
569 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
570 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
571 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
572 | if (ret < 0) { | |
573 | perror("send consumer stream"); | |
574 | goto error; | |
575 | } | |
576 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
577 | if (ret < 0) { | |
578 | perror("send consumer stream ancillary data"); | |
579 | goto error; | |
f3ed775e DG |
580 | } |
581 | } | |
582 | ||
3bd1e081 | 583 | DBG("consumer channel streams sent"); |
f3ed775e DG |
584 | |
585 | return 0; | |
586 | ||
587 | error: | |
588 | return ret; | |
589 | } | |
590 | ||
591 | /* | |
d063d709 | 592 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 593 | */ |
2bdd86d4 | 594 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 595 | struct ltt_kernel_session *session) |
f3ed775e DG |
596 | { |
597 | int ret; | |
598 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
599 | struct lttcomm_consumer_msg lkm; |
600 | int sock = session->consumer_fd; | |
7a485870 DG |
601 | |
602 | DBG("Sending metadata stream fd"); | |
603 | ||
2bdd86d4 | 604 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 605 | if (session->consumer_fd == 0) { |
3bd1e081 | 606 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
607 | } |
608 | ||
7a485870 | 609 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
610 | /* Send metadata channel fd */ |
611 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
612 | lkm.u.channel.channel_key = session->metadata->fd; | |
613 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
614 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
615 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
616 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
617 | if (ret < 0) { | |
618 | perror("send consumer channel"); | |
619 | goto error; | |
620 | } | |
621 | ||
622 | /* Send metadata stream fd */ | |
623 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
624 | lkm.u.stream.channel_key = session->metadata->fd; | |
625 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
626 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
627 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
628 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
629 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
630 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
631 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
632 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
7a485870 | 633 | if (ret < 0) { |
3bd1e081 MD |
634 | perror("send consumer stream"); |
635 | goto error; | |
636 | } | |
637 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 638 | if (ret < 0) { |
3bd1e081 | 639 | perror("send consumer stream"); |
7a485870 DG |
640 | goto error; |
641 | } | |
642 | } | |
f3ed775e | 643 | |
f3ed775e | 644 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 | 645 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
f3ed775e | 646 | if (ret < 0) { |
7a485870 | 647 | goto error; |
f3ed775e DG |
648 | } |
649 | } | |
650 | ||
2bdd86d4 | 651 | DBG("consumer fds (metadata and channel streams) sent"); |
7a485870 | 652 | |
f3ed775e DG |
653 | return 0; |
654 | ||
655 | error: | |
656 | return ret; | |
657 | } | |
658 | ||
fac6795d | 659 | /* |
0fdd1e2c | 660 | * Notify UST applications using the shm mmap futex. |
fac6795d | 661 | */ |
0fdd1e2c | 662 | static int notify_ust_apps(int active) |
fac6795d | 663 | { |
0fdd1e2c | 664 | char *wait_shm_mmap; |
fac6795d | 665 | |
0fdd1e2c | 666 | DBG("Notifying applications of session daemon state: %d", active); |
fac6795d | 667 | |
62d53818 DG |
668 | tracepoint(ust_notify_apps_start); |
669 | ||
0fdd1e2c DG |
670 | /* See shm.c for this call implying mmap, shm and futex calls */ |
671 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
672 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
673 | goto error; |
674 | } | |
675 | ||
0fdd1e2c DG |
676 | /* Wake waiting process */ |
677 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
678 | ||
62d53818 DG |
679 | tracepoint(ust_notify_apps_stop); |
680 | ||
0fdd1e2c DG |
681 | /* Apps notified successfully */ |
682 | return 0; | |
fac6795d DG |
683 | |
684 | error: | |
0fdd1e2c | 685 | return -1; |
fac6795d DG |
686 | } |
687 | ||
e065084a | 688 | /* |
d063d709 DG |
689 | * Setup the outgoing data buffer for the response (llm) by allocating the |
690 | * right amount of memory and copying the original information from the lsm | |
691 | * structure. | |
ca95a216 | 692 | * |
d063d709 | 693 | * Return total size of the buffer pointed by buf. |
ca95a216 | 694 | */ |
5461b305 | 695 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 696 | { |
f3ed775e | 697 | int ret, buf_size; |
ca95a216 | 698 | |
f3ed775e | 699 | buf_size = size; |
5461b305 | 700 | |
ba7f0ae5 | 701 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 702 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 703 | perror("zmalloc"); |
5461b305 | 704 | ret = -ENOMEM; |
ca95a216 DG |
705 | goto error; |
706 | } | |
707 | ||
5461b305 DG |
708 | /* Copy common data */ |
709 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 710 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 711 | |
5461b305 DG |
712 | cmd_ctx->llm->data_size = size; |
713 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
714 | ||
ca95a216 DG |
715 | return buf_size; |
716 | ||
717 | error: | |
718 | return ret; | |
719 | } | |
720 | ||
7a485870 | 721 | /* |
5eb91c98 | 722 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 723 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 724 | */ |
5eb91c98 | 725 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 726 | { |
5eb91c98 | 727 | int ret; |
7a485870 DG |
728 | struct ltt_session *session; |
729 | struct ltt_kernel_channel *channel; | |
730 | ||
5eb91c98 | 731 | DBG("Updating kernel poll set"); |
7a485870 | 732 | |
54d01ffb | 733 | session_lock_list(); |
b5541356 | 734 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 735 | session_lock(session); |
7a485870 | 736 | if (session->kernel_session == NULL) { |
54d01ffb | 737 | session_unlock(session); |
7a485870 DG |
738 | continue; |
739 | } | |
7a485870 | 740 | |
54d01ffb DG |
741 | cds_list_for_each_entry(channel, |
742 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
743 | /* Add channel fd to the kernel poll set */ |
744 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
745 | if (ret < 0) { | |
54d01ffb | 746 | session_unlock(session); |
5eb91c98 DG |
747 | goto error; |
748 | } | |
749 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 750 | } |
54d01ffb | 751 | session_unlock(session); |
7a485870 | 752 | } |
54d01ffb | 753 | session_unlock_list(); |
7a485870 | 754 | |
5eb91c98 | 755 | return 0; |
7a485870 DG |
756 | |
757 | error: | |
54d01ffb | 758 | session_unlock_list(); |
7a485870 DG |
759 | return -1; |
760 | } | |
761 | ||
762 | /* | |
54d01ffb | 763 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 764 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 765 | * |
d063d709 | 766 | * Useful for CPU hotplug feature. |
7a485870 | 767 | */ |
2bdd86d4 | 768 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
769 | { |
770 | int ret = 0; | |
771 | struct ltt_session *session; | |
772 | struct ltt_kernel_channel *channel; | |
773 | ||
774 | DBG("Updating kernel streams for channel fd %d", fd); | |
775 | ||
54d01ffb | 776 | session_lock_list(); |
b5541356 | 777 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 778 | session_lock(session); |
7a485870 | 779 | if (session->kernel_session == NULL) { |
54d01ffb | 780 | session_unlock(session); |
7a485870 DG |
781 | continue; |
782 | } | |
d9800920 DG |
783 | |
784 | /* This is not suppose to be 0 but this is an extra security check */ | |
785 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 786 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
787 | } |
788 | ||
5eb91c98 DG |
789 | cds_list_for_each_entry(channel, |
790 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
791 | if (channel->fd == fd) { |
792 | DBG("Channel found, updating kernel streams"); | |
793 | ret = kernel_open_channel_stream(channel); | |
794 | if (ret < 0) { | |
b3c750d2 | 795 | goto error; |
7a485870 | 796 | } |
d9800920 | 797 | |
7a485870 | 798 | /* |
5eb91c98 DG |
799 | * Have we already sent fds to the consumer? If yes, it means |
800 | * that tracing is started so it is safe to send our updated | |
801 | * stream fds. | |
7a485870 | 802 | */ |
3bd1e081 | 803 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 804 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 805 | session->kernel_session->consumer_fd, channel); |
7a485870 | 806 | if (ret < 0) { |
b3c750d2 | 807 | goto error; |
7a485870 DG |
808 | } |
809 | } | |
b3c750d2 | 810 | goto error; |
7a485870 DG |
811 | } |
812 | } | |
54d01ffb | 813 | session_unlock(session); |
7a485870 | 814 | } |
54d01ffb | 815 | session_unlock_list(); |
b3c750d2 | 816 | return ret; |
7a485870 | 817 | |
b3c750d2 | 818 | error: |
54d01ffb DG |
819 | session_unlock(session); |
820 | session_unlock_list(); | |
7a485870 DG |
821 | return ret; |
822 | } | |
823 | ||
487cf67c DG |
824 | /* |
825 | * For each tracing session, update newly registered apps. | |
826 | */ | |
827 | static void update_ust_app(int app_sock) | |
828 | { | |
829 | struct ltt_session *sess, *stmp; | |
830 | ||
831 | /* For all tracing session(s) */ | |
832 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
833 | if (sess->ust_session) { |
834 | ust_app_global_update(sess->ust_session, app_sock); | |
835 | } | |
487cf67c DG |
836 | } |
837 | } | |
838 | ||
7a485870 | 839 | /* |
d063d709 | 840 | * This thread manage event coming from the kernel. |
7a485870 | 841 | * |
d063d709 DG |
842 | * Features supported in this thread: |
843 | * -) CPU Hotplug | |
7a485870 DG |
844 | */ |
845 | static void *thread_manage_kernel(void *data) | |
846 | { | |
5eb91c98 DG |
847 | int ret, i, pollfd, update_poll_flag = 1; |
848 | uint32_t revents, nb_fd; | |
7a485870 | 849 | char tmp; |
5eb91c98 | 850 | struct lttng_poll_event events; |
7a485870 | 851 | |
b25a8868 DG |
852 | tracepoint(sessiond_th_kern_start); |
853 | ||
7a485870 DG |
854 | DBG("Thread manage kernel started"); |
855 | ||
5eb91c98 DG |
856 | ret = create_thread_poll_set(&events, 2); |
857 | if (ret < 0) { | |
858 | goto error; | |
859 | } | |
860 | ||
861 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
862 | if (ret < 0) { | |
863 | goto error; | |
864 | } | |
865 | ||
7a485870 DG |
866 | while (1) { |
867 | if (update_poll_flag == 1) { | |
5f822d0a DG |
868 | /* |
869 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
870 | * quit pipe and the kernel pipe. | |
871 | */ | |
872 | events.nb_fd = 2; | |
873 | ||
5eb91c98 DG |
874 | ret = update_kernel_poll(&events); |
875 | if (ret < 0) { | |
7a485870 DG |
876 | goto error; |
877 | } | |
878 | update_poll_flag = 0; | |
879 | } | |
880 | ||
5eb91c98 DG |
881 | nb_fd = LTTNG_POLL_GETNB(&events); |
882 | ||
883 | DBG("Thread kernel polling on %d fds", nb_fd); | |
884 | ||
885 | /* Zeroed the poll events */ | |
886 | lttng_poll_reset(&events); | |
7a485870 | 887 | |
b25a8868 DG |
888 | tracepoint(sessiond_th_kern_poll); |
889 | ||
7a485870 | 890 | /* Poll infinite value of time */ |
5eb91c98 | 891 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 892 | if (ret < 0) { |
7a485870 DG |
893 | goto error; |
894 | } else if (ret == 0) { | |
895 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
896 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
897 | "This should not have happened! Continuing..."); | |
7a485870 DG |
898 | continue; |
899 | } | |
900 | ||
5eb91c98 DG |
901 | for (i = 0; i < nb_fd; i++) { |
902 | /* Fetch once the poll data */ | |
903 | revents = LTTNG_POLL_GETEV(&events, i); | |
904 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 905 | |
5eb91c98 DG |
906 | /* Thread quit pipe has been closed. Killing thread. */ |
907 | ret = check_thread_quit_pipe(pollfd, revents); | |
908 | if (ret) { | |
909 | goto error; | |
910 | } | |
7a485870 | 911 | |
5eb91c98 DG |
912 | /* Check for data on kernel pipe */ |
913 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
914 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
915 | update_poll_flag = 1; | |
916 | continue; | |
917 | } else { | |
918 | /* | |
919 | * New CPU detected by the kernel. Adding kernel stream to | |
920 | * kernel session and updating the kernel consumer | |
921 | */ | |
922 | if (revents & LPOLLIN) { | |
2bdd86d4 | 923 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
924 | if (ret < 0) { |
925 | continue; | |
926 | } | |
927 | break; | |
928 | /* | |
929 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
930 | * and unregister kernel stream at this point. | |
931 | */ | |
7a485870 | 932 | } |
7a485870 DG |
933 | } |
934 | } | |
935 | } | |
936 | ||
937 | error: | |
938 | DBG("Kernel thread dying"); | |
273ea72c DG |
939 | close(kernel_poll_pipe[0]); |
940 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
941 | |
942 | lttng_poll_clean(&events); | |
943 | ||
7a485870 DG |
944 | return NULL; |
945 | } | |
946 | ||
1d4b027a | 947 | /* |
3bd1e081 | 948 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 949 | */ |
3bd1e081 | 950 | static void *thread_manage_consumer(void *data) |
1d4b027a | 951 | { |
5eb91c98 DG |
952 | int sock = 0, i, ret, pollfd; |
953 | uint32_t revents, nb_fd; | |
1d4b027a | 954 | enum lttcomm_return_code code; |
5eb91c98 | 955 | struct lttng_poll_event events; |
3bd1e081 | 956 | struct consumer_data *consumer_data = data; |
1d4b027a | 957 | |
b25a8868 DG |
958 | tracepoint(sessiond_th_kcon_start); |
959 | ||
3bd1e081 | 960 | DBG("[thread] Manage consumer started"); |
1d4b027a | 961 | |
3bd1e081 | 962 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
963 | if (ret < 0) { |
964 | goto error; | |
965 | } | |
966 | ||
5eb91c98 DG |
967 | /* |
968 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
969 | * Nothing more will be added to this poll set. | |
970 | */ | |
971 | ret = create_thread_poll_set(&events, 2); | |
972 | if (ret < 0) { | |
973 | goto error; | |
974 | } | |
273ea72c | 975 | |
3bd1e081 | 976 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
977 | if (ret < 0) { |
978 | goto error; | |
979 | } | |
273ea72c | 980 | |
5eb91c98 | 981 | nb_fd = LTTNG_POLL_GETNB(&events); |
273ea72c | 982 | |
b25a8868 DG |
983 | tracepoint(sessiond_th_kcon_poll); |
984 | ||
273ea72c | 985 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 986 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 987 | if (ret < 0) { |
273ea72c DG |
988 | goto error; |
989 | } | |
990 | ||
5eb91c98 DG |
991 | for (i = 0; i < nb_fd; i++) { |
992 | /* Fetch once the poll data */ | |
993 | revents = LTTNG_POLL_GETEV(&events, i); | |
994 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
995 | ||
996 | /* Thread quit pipe has been closed. Killing thread. */ | |
997 | ret = check_thread_quit_pipe(pollfd, revents); | |
998 | if (ret) { | |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | /* Event on the registration socket */ | |
3bd1e081 | 1003 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1004 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1005 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1006 | goto error; |
1007 | } | |
1008 | } | |
273ea72c DG |
1009 | } |
1010 | ||
3bd1e081 | 1011 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1012 | if (sock < 0) { |
1013 | goto error; | |
1014 | } | |
1015 | ||
3bd1e081 | 1016 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1017 | |
712ea556 | 1018 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1019 | ret = lttcomm_recv_unix_sock(sock, &code, |
1020 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1021 | if (ret <= 0) { |
1022 | goto error; | |
1023 | } | |
1024 | ||
3bd1e081 MD |
1025 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1026 | consumer_data->cmd_sock = | |
1027 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1028 | if (consumer_data->cmd_sock < 0) { | |
1029 | sem_post(&consumer_data->sem); | |
48842b30 | 1030 | PERROR("consumer connect"); |
1d4b027a DG |
1031 | goto error; |
1032 | } | |
1033 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1034 | sem_post(&consumer_data->sem); |
1035 | DBG("consumer command socket ready"); | |
1d4b027a | 1036 | } else { |
3bd1e081 | 1037 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1038 | lttcomm_get_readable_code(-code)); |
1039 | goto error; | |
1040 | } | |
1041 | ||
54d01ffb | 1042 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1043 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1044 | if (ret < 0) { |
72079cae DG |
1045 | goto error; |
1046 | } | |
1047 | ||
5eb91c98 DG |
1048 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1049 | if (ret < 0) { | |
72079cae | 1050 | goto error; |
5eb91c98 DG |
1051 | } |
1052 | ||
1053 | /* Update number of fd */ | |
1054 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1055 | ||
1056 | /* Inifinite blocking call, waiting for transmission */ | |
1057 | ret = lttng_poll_wait(&events, -1); | |
1058 | if (ret < 0) { | |
72079cae DG |
1059 | goto error; |
1060 | } | |
1061 | ||
5eb91c98 DG |
1062 | for (i = 0; i < nb_fd; i++) { |
1063 | /* Fetch once the poll data */ | |
1064 | revents = LTTNG_POLL_GETEV(&events, i); | |
1065 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1066 | ||
1067 | /* Thread quit pipe has been closed. Killing thread. */ | |
1068 | ret = check_thread_quit_pipe(pollfd, revents); | |
1069 | if (ret) { | |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* Event on the kconsumerd socket */ | |
1074 | if (pollfd == sock) { | |
1075 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1076 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1077 | goto error; |
1078 | } | |
1079 | } | |
1080 | } | |
1081 | ||
712ea556 | 1082 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1083 | ret = lttcomm_recv_unix_sock(sock, &code, |
1084 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1085 | if (ret <= 0) { |
3bd1e081 | 1086 | ERR("consumer closed the command socket"); |
712ea556 | 1087 | goto error; |
6f61d021 | 1088 | } |
1d4b027a | 1089 | |
3bd1e081 | 1090 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1091 | |
1d4b027a | 1092 | error: |
3bd1e081 MD |
1093 | DBG("consumer thread dying"); |
1094 | close(consumer_data->err_sock); | |
1095 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1096 | close(sock); |
273ea72c | 1097 | |
3bd1e081 MD |
1098 | unlink(consumer_data->err_unix_sock_path); |
1099 | unlink(consumer_data->cmd_unix_sock_path); | |
1100 | consumer_data->pid = 0; | |
0177d773 | 1101 | |
5eb91c98 | 1102 | lttng_poll_clean(&events); |
0177d773 | 1103 | |
5eb91c98 | 1104 | return NULL; |
099e26bd DG |
1105 | } |
1106 | ||
099e26bd DG |
1107 | /* |
1108 | * This thread manage application communication. | |
1d4b027a DG |
1109 | */ |
1110 | static void *thread_manage_apps(void *data) | |
099e26bd | 1111 | { |
5eb91c98 DG |
1112 | int i, ret, pollfd; |
1113 | uint32_t revents, nb_fd; | |
099e26bd | 1114 | struct ust_command ust_cmd; |
5eb91c98 | 1115 | struct lttng_poll_event events; |
099e26bd | 1116 | |
85c434ee DG |
1117 | tracepoint(sessiond_th_apps_start); |
1118 | ||
099e26bd DG |
1119 | DBG("[thread] Manage application started"); |
1120 | ||
f6a9efaa DG |
1121 | rcu_register_thread(); |
1122 | rcu_thread_online(); | |
1123 | ||
5eb91c98 DG |
1124 | ret = create_thread_poll_set(&events, 2); |
1125 | if (ret < 0) { | |
1126 | goto error; | |
1127 | } | |
099e26bd | 1128 | |
5eb91c98 DG |
1129 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1130 | if (ret < 0) { | |
1131 | goto error; | |
1132 | } | |
099e26bd | 1133 | |
5eb91c98 DG |
1134 | while (1) { |
1135 | /* Zeroed the events structure */ | |
1136 | lttng_poll_reset(&events); | |
0177d773 | 1137 | |
5eb91c98 | 1138 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1139 | |
1140 | DBG("Apps thread polling on %d fds", nb_fd); | |
1141 | ||
85c434ee DG |
1142 | tracepoint(sessiond_th_apps_poll); |
1143 | ||
099e26bd | 1144 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1145 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1146 | if (ret < 0) { |
099e26bd DG |
1147 | goto error; |
1148 | } | |
1149 | ||
5eb91c98 DG |
1150 | for (i = 0; i < nb_fd; i++) { |
1151 | /* Fetch once the poll data */ | |
1152 | revents = LTTNG_POLL_GETEV(&events, i); | |
1153 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1154 | ||
1155 | /* Thread quit pipe has been closed. Killing thread. */ | |
1156 | ret = check_thread_quit_pipe(pollfd, revents); | |
1157 | if (ret) { | |
099e26bd | 1158 | goto error; |
5eb91c98 | 1159 | } |
62d53818 | 1160 | |
5eb91c98 DG |
1161 | /* Inspect the apps cmd pipe */ |
1162 | if (pollfd == apps_cmd_pipe[0]) { | |
1163 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1164 | ERR("Apps command pipe error"); | |
0177d773 | 1165 | goto error; |
5eb91c98 | 1166 | } else if (revents & LPOLLIN) { |
dab4c8a1 | 1167 | tracepoint(ust_register_read_start); |
5eb91c98 DG |
1168 | /* Empty pipe */ |
1169 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1170 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1171 | perror("read apps cmd pipe"); | |
1172 | goto error; | |
1173 | } | |
a89c7d1b | 1174 | tracepoint(ust_register_read_stop); |
099e26bd | 1175 | |
a89c7d1b | 1176 | tracepoint(ust_register_add_start); |
5eb91c98 | 1177 | /* Register applicaton to the session daemon */ |
56fff090 | 1178 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1179 | ust_cmd.sock); |
88ff5b7f | 1180 | if (ret == -ENOMEM) { |
5eb91c98 | 1181 | goto error; |
88ff5b7f MD |
1182 | } else if (ret < 0) { |
1183 | break; | |
5eb91c98 | 1184 | } |
a89c7d1b | 1185 | tracepoint(ust_register_add_stop); |
85c434ee | 1186 | |
a89c7d1b | 1187 | tracepoint(ust_register_done_start); |
acc7b41b MD |
1188 | /* |
1189 | * Add channel(s) and event(s) to newly registered apps | |
1190 | * from lttng global UST domain. | |
1191 | */ | |
1192 | update_ust_app(ust_cmd.sock); | |
1193 | ||
5eb91c98 DG |
1194 | ret = ustctl_register_done(ust_cmd.sock); |
1195 | if (ret < 0) { | |
1196 | /* | |
1197 | * If the registration is not possible, we simply | |
1198 | * unregister the apps and continue | |
1199 | */ | |
56fff090 | 1200 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1201 | } else { |
1202 | /* | |
1203 | * We just need here to monitor the close of the UST | |
1204 | * socket and poll set monitor those by default. | |
1205 | */ | |
1206 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1207 | if (ret < 0) { | |
1208 | goto error; | |
1209 | } | |
1210 | ||
54d01ffb DG |
1211 | DBG("Apps with sock %d added to poll set", |
1212 | ust_cmd.sock); | |
5eb91c98 | 1213 | } |
a89c7d1b | 1214 | tracepoint(ust_register_done_stop); |
5eb91c98 | 1215 | break; |
0177d773 | 1216 | } |
5eb91c98 DG |
1217 | } else { |
1218 | /* | |
54d01ffb DG |
1219 | * At this point, we know that a registered application made |
1220 | * the event at poll_wait. | |
5eb91c98 DG |
1221 | */ |
1222 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
aa231298 DG |
1223 | tracepoint(ust_unregister_start); |
1224 | ||
5eb91c98 DG |
1225 | /* Removing from the poll set */ |
1226 | ret = lttng_poll_del(&events, pollfd); | |
1227 | if (ret < 0) { | |
1228 | goto error; | |
1229 | } | |
099e26bd | 1230 | |
b9d9b220 | 1231 | /* Socket closed on remote end. */ |
56fff090 | 1232 | ust_app_unregister(pollfd); |
aa231298 DG |
1233 | |
1234 | tracepoint(ust_unregister_stop); | |
5eb91c98 | 1235 | break; |
0177d773 | 1236 | } |
099e26bd DG |
1237 | } |
1238 | } | |
099e26bd DG |
1239 | } |
1240 | ||
1241 | error: | |
1242 | DBG("Application communication apps dying"); | |
1243 | close(apps_cmd_pipe[0]); | |
1244 | close(apps_cmd_pipe[1]); | |
1245 | ||
5eb91c98 | 1246 | lttng_poll_clean(&events); |
099e26bd | 1247 | |
f6a9efaa DG |
1248 | rcu_thread_offline(); |
1249 | rcu_unregister_thread(); | |
099e26bd DG |
1250 | return NULL; |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * Dispatch request from the registration threads to the application | |
1255 | * communication thread. | |
1256 | */ | |
1257 | static void *thread_dispatch_ust_registration(void *data) | |
1258 | { | |
1259 | int ret; | |
1260 | struct cds_wfq_node *node; | |
1261 | struct ust_command *ust_cmd = NULL; | |
1262 | ||
85c434ee DG |
1263 | tracepoint(sessiond_th_dispatch_start); |
1264 | ||
099e26bd DG |
1265 | DBG("[thread] Dispatch UST command started"); |
1266 | ||
1267 | while (!dispatch_thread_exit) { | |
1268 | /* Atomically prepare the queue futex */ | |
1269 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1270 | ||
1271 | do { | |
85c434ee DG |
1272 | tracepoint(sessiond_th_dispatch_block); |
1273 | ||
099e26bd DG |
1274 | /* Dequeue command for registration */ |
1275 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1276 | if (node == NULL) { | |
00a17c97 | 1277 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1278 | /* Continue thread execution */ |
1279 | break; | |
1280 | } | |
1281 | ||
62d53818 DG |
1282 | tracepoint(ust_dispatch_register_start); |
1283 | ||
099e26bd DG |
1284 | ust_cmd = caa_container_of(node, struct ust_command, node); |
1285 | ||
2f50c8a3 DG |
1286 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1287 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1288 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1289 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1290 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1291 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1292 | /* |
1293 | * Inform apps thread of the new application registration. This | |
1294 | * call is blocking so we can be assured that the data will be read | |
1295 | * at some point in time or wait to the end of the world :) | |
1296 | */ | |
1297 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1298 | sizeof(struct ust_command)); | |
1299 | if (ret < 0) { | |
1300 | perror("write apps cmd pipe"); | |
1301 | if (errno == EBADF) { | |
1302 | /* | |
1303 | * We can't inform the application thread to process | |
1304 | * registration. We will exit or else application | |
1305 | * registration will not occur and tracing will never | |
1306 | * start. | |
1307 | */ | |
1308 | goto error; | |
1309 | } | |
1310 | } | |
1311 | free(ust_cmd); | |
1312 | } while (node != NULL); | |
1313 | ||
62d53818 DG |
1314 | tracepoint(ust_dispatch_register_stop); |
1315 | ||
099e26bd DG |
1316 | /* Futex wait on queue. Blocking call on futex() */ |
1317 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1318 | } | |
1319 | ||
1320 | error: | |
1321 | DBG("Dispatch thread dying"); | |
1322 | return NULL; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * This thread manage application registration. | |
1327 | */ | |
1328 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1329 | { |
5eb91c98 DG |
1330 | int sock = 0, i, ret, pollfd; |
1331 | uint32_t revents, nb_fd; | |
1332 | struct lttng_poll_event events; | |
099e26bd DG |
1333 | /* |
1334 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1335 | * freed in the manage apps thread. | |
1336 | */ | |
1337 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1338 | |
62d53818 | 1339 | tracepoint(sessiond_th_reg_start); |
b25a8868 | 1340 | |
099e26bd | 1341 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1342 | |
1343 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1344 | if (ret < 0) { | |
1345 | goto error; | |
1346 | } | |
1347 | ||
5eb91c98 DG |
1348 | /* |
1349 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1350 | * more will be added to this poll set. | |
1351 | */ | |
1352 | ret = create_thread_poll_set(&events, 2); | |
1353 | if (ret < 0) { | |
1354 | goto error; | |
1355 | } | |
273ea72c | 1356 | |
5eb91c98 DG |
1357 | /* Add the application registration socket */ |
1358 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1359 | if (ret < 0) { | |
1360 | goto error; | |
1361 | } | |
273ea72c | 1362 | |
1d4b027a | 1363 | /* Notify all applications to register */ |
0fdd1e2c DG |
1364 | ret = notify_ust_apps(1); |
1365 | if (ret < 0) { | |
1366 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1367 | "Execution continues but there might be problem for already\n" |
1368 | "running applications that wishes to register."); | |
0fdd1e2c | 1369 | } |
1d4b027a DG |
1370 | |
1371 | while (1) { | |
1372 | DBG("Accepting application registration"); | |
273ea72c | 1373 | |
62d53818 | 1374 | tracepoint(sessiond_th_reg_poll); |
b25a8868 | 1375 | |
5eb91c98 DG |
1376 | nb_fd = LTTNG_POLL_GETNB(&events); |
1377 | ||
273ea72c | 1378 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1379 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1380 | if (ret < 0) { |
273ea72c DG |
1381 | goto error; |
1382 | } | |
1383 | ||
5eb91c98 DG |
1384 | for (i = 0; i < nb_fd; i++) { |
1385 | /* Fetch once the poll data */ | |
1386 | revents = LTTNG_POLL_GETEV(&events, i); | |
1387 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1388 | |
5eb91c98 DG |
1389 | /* Thread quit pipe has been closed. Killing thread. */ |
1390 | ret = check_thread_quit_pipe(pollfd, revents); | |
1391 | if (ret) { | |
90014c57 DG |
1392 | goto error; |
1393 | } | |
62d53818 | 1394 | |
5eb91c98 DG |
1395 | /* Event on the registration socket */ |
1396 | if (pollfd == apps_sock) { | |
1397 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1398 | ERR("Register apps socket poll error"); | |
1399 | goto error; | |
1400 | } else if (revents & LPOLLIN) { | |
dab4c8a1 DG |
1401 | /* Registration starts here. Recording cycles */ |
1402 | tracepoint(ust_register_start); | |
1d4b027a | 1403 | |
5eb91c98 DG |
1404 | sock = lttcomm_accept_unix_sock(apps_sock); |
1405 | if (sock < 0) { | |
1406 | goto error; | |
1407 | } | |
099e26bd | 1408 | |
5eb91c98 | 1409 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1410 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1411 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1412 | perror("ust command zmalloc"); |
5eb91c98 DG |
1413 | goto error; |
1414 | } | |
1d4b027a | 1415 | |
5eb91c98 DG |
1416 | /* |
1417 | * Using message-based transmissions to ensure we don't | |
1418 | * have to deal with partially received messages. | |
1419 | */ | |
1420 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1421 | sizeof(struct ust_register_msg)); | |
1422 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1423 | if (ret < 0) { | |
1424 | perror("lttcomm_recv_unix_sock register apps"); | |
1425 | } else { | |
1426 | ERR("Wrong size received on apps register"); | |
1427 | } | |
1428 | free(ust_cmd); | |
1429 | close(sock); | |
1430 | continue; | |
1431 | } | |
099e26bd | 1432 | |
5eb91c98 | 1433 | ust_cmd->sock = sock; |
099e26bd | 1434 | |
5eb91c98 DG |
1435 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1436 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1437 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1438 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1439 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1440 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1441 | |
5eb91c98 DG |
1442 | /* |
1443 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1444 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1445 | */ |
1446 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
62d53818 | 1447 | |
5eb91c98 DG |
1448 | /* |
1449 | * Wake the registration queue futex. Implicit memory | |
1450 | * barrier with the exchange in cds_wfq_enqueue. | |
1451 | */ | |
1452 | futex_nto1_wake(&ust_cmd_queue.futex); | |
dab4c8a1 DG |
1453 | |
1454 | tracepoint(ust_register_stop); | |
5eb91c98 DG |
1455 | } |
1456 | } | |
90014c57 | 1457 | } |
1d4b027a DG |
1458 | } |
1459 | ||
1460 | error: | |
0fdd1e2c DG |
1461 | DBG("UST Registration thread dying"); |
1462 | ||
1463 | /* Notify that the registration thread is gone */ | |
1464 | notify_ust_apps(0); | |
1465 | ||
1466 | close(apps_sock); | |
1467 | close(sock); | |
273ea72c | 1468 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1469 | |
5eb91c98 DG |
1470 | lttng_poll_clean(&events); |
1471 | ||
1d4b027a DG |
1472 | return NULL; |
1473 | } | |
1474 | ||
8c0faa1d | 1475 | /* |
3bd1e081 | 1476 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1477 | * exec or it will fails. |
8c0faa1d | 1478 | */ |
3bd1e081 | 1479 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1480 | { |
1481 | int ret; | |
ee0b0061 DG |
1482 | struct timespec timeout; |
1483 | ||
1484 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1485 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1486 | |
1487 | /* Setup semaphore */ | |
3bd1e081 | 1488 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1489 | if (ret < 0) { |
3bd1e081 | 1490 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1491 | goto error; |
1492 | } | |
8c0faa1d | 1493 | |
3bd1e081 MD |
1494 | ret = pthread_create(&consumer_data->thread, NULL, |
1495 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1496 | if (ret != 0) { |
3bd1e081 | 1497 | PERROR("pthread_create consumer"); |
ee0b0061 | 1498 | ret = -1; |
8c0faa1d DG |
1499 | goto error; |
1500 | } | |
1501 | ||
ee0b0061 DG |
1502 | /* Get time for sem_timedwait absolute timeout */ |
1503 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1504 | if (ret < 0) { | |
3bd1e081 | 1505 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1506 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1507 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1508 | } else { |
1509 | /* Normal timeout if the gettime was successful */ | |
1510 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1511 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1512 | } |
8c0faa1d | 1513 | |
ee0b0061 DG |
1514 | if (ret < 0) { |
1515 | if (errno == ETIMEDOUT) { | |
1516 | /* | |
1517 | * Call has timed out so we kill the kconsumerd_thread and return | |
1518 | * an error. | |
1519 | */ | |
3bd1e081 MD |
1520 | ERR("The consumer thread was never ready. Killing it"); |
1521 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1522 | if (ret < 0) { |
3bd1e081 | 1523 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1524 | } |
1525 | } else { | |
3bd1e081 | 1526 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1527 | } |
1528 | goto error; | |
1529 | } | |
1530 | ||
3bd1e081 MD |
1531 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1532 | if (consumer_data->pid == 0) { | |
712ea556 | 1533 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1534 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1535 | goto error; |
1536 | } | |
3bd1e081 | 1537 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1538 | |
8c0faa1d DG |
1539 | return 0; |
1540 | ||
1541 | error: | |
1542 | return ret; | |
1543 | } | |
1544 | ||
d9800920 | 1545 | /* |
3bd1e081 | 1546 | * Join consumer thread |
d9800920 | 1547 | */ |
3bd1e081 | 1548 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1549 | { |
1550 | void *status; | |
1551 | int ret; | |
1552 | ||
3bd1e081 MD |
1553 | if (consumer_data->pid != 0) { |
1554 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1555 | if (ret) { |
3bd1e081 | 1556 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1557 | return ret; |
1558 | } | |
3bd1e081 | 1559 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1560 | } else { |
1561 | return 0; | |
1562 | } | |
1563 | } | |
1564 | ||
8c0faa1d | 1565 | /* |
3bd1e081 | 1566 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1567 | * |
d063d709 | 1568 | * Return pid if successful else -1. |
8c0faa1d | 1569 | */ |
3bd1e081 | 1570 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1571 | { |
1572 | int ret; | |
1573 | pid_t pid; | |
53086306 | 1574 | const char *verbosity; |
8c0faa1d | 1575 | |
3bd1e081 | 1576 | DBG("Spawning consumerd"); |
c49dc785 | 1577 | |
8c0faa1d DG |
1578 | pid = fork(); |
1579 | if (pid == 0) { | |
1580 | /* | |
3bd1e081 | 1581 | * Exec consumerd. |
8c0faa1d | 1582 | */ |
3bd1e081 | 1583 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1584 | verbosity = "--verbose"; |
1585 | } else { | |
1586 | verbosity = "--quiet"; | |
1587 | } | |
3bd1e081 MD |
1588 | switch (consumer_data->type) { |
1589 | case LTTNG_CONSUMER_KERNEL: | |
1590 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
7753dea8 MD |
1591 | "lttng-consumerd", verbosity, "-k", |
1592 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1593 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1594 | NULL); | |
3bd1e081 | 1595 | break; |
7753dea8 MD |
1596 | case LTTNG_CONSUMER64_UST: |
1597 | { | |
b1e0b6b6 | 1598 | char *tmpnew = NULL; |
8f4905da MD |
1599 | |
1600 | if (consumerd64_libdir[0] != '\0') { | |
1601 | char *tmp; | |
1602 | size_t tmplen; | |
1603 | ||
1604 | tmp = getenv("LD_LIBRARY_PATH"); | |
1605 | if (!tmp) { | |
1606 | tmp = ""; | |
1607 | } | |
1608 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1609 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1610 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1611 | if (!tmpnew) { | |
1612 | ret = -ENOMEM; | |
1613 | goto error; | |
1614 | } | |
1615 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1616 | strcat(tmpnew, consumerd64_libdir); | |
1617 | if (tmp[0] != '\0') { | |
1618 | strcat(tmpnew, ":"); | |
1619 | strcat(tmpnew, tmp); | |
1620 | } | |
1621 | ret = putenv(tmpnew); | |
1622 | if (ret) { | |
1623 | ret = -errno; | |
1624 | goto error; | |
1625 | } | |
1626 | } | |
1627 | ret = execl(consumerd64_path, verbosity, "-u", | |
7753dea8 MD |
1628 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1629 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1630 | NULL); | |
8f4905da MD |
1631 | if (consumerd64_libdir[0] != '\0') { |
1632 | free(tmpnew); | |
1633 | } | |
1634 | if (ret) { | |
1635 | goto error; | |
1636 | } | |
3bd1e081 | 1637 | break; |
7753dea8 MD |
1638 | } |
1639 | case LTTNG_CONSUMER32_UST: | |
1640 | { | |
937dde8e | 1641 | char *tmpnew = NULL; |
8f4905da MD |
1642 | |
1643 | if (consumerd32_libdir[0] != '\0') { | |
1644 | char *tmp; | |
1645 | size_t tmplen; | |
1646 | ||
1647 | tmp = getenv("LD_LIBRARY_PATH"); | |
1648 | if (!tmp) { | |
1649 | tmp = ""; | |
1650 | } | |
1651 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1652 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1653 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1654 | if (!tmpnew) { | |
1655 | ret = -ENOMEM; | |
1656 | goto error; | |
1657 | } | |
1658 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1659 | strcat(tmpnew, consumerd32_libdir); | |
1660 | if (tmp[0] != '\0') { | |
1661 | strcat(tmpnew, ":"); | |
1662 | strcat(tmpnew, tmp); | |
1663 | } | |
1664 | ret = putenv(tmpnew); | |
1665 | if (ret) { | |
1666 | ret = -errno; | |
1667 | goto error; | |
1668 | } | |
1669 | } | |
1670 | ret = execl(consumerd32_path, verbosity, "-u", | |
7753dea8 MD |
1671 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1672 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1673 | NULL); | |
8f4905da MD |
1674 | if (consumerd32_libdir[0] != '\0') { |
1675 | free(tmpnew); | |
1676 | } | |
1677 | if (ret) { | |
1678 | goto error; | |
1679 | } | |
3bd1e081 | 1680 | break; |
7753dea8 | 1681 | } |
3bd1e081 MD |
1682 | default: |
1683 | perror("unknown consumer type"); | |
1684 | exit(EXIT_FAILURE); | |
1685 | } | |
8c0faa1d DG |
1686 | if (errno != 0) { |
1687 | perror("kernel start consumer exec"); | |
1688 | } | |
1689 | exit(EXIT_FAILURE); | |
1690 | } else if (pid > 0) { | |
1691 | ret = pid; | |
8c0faa1d | 1692 | } else { |
3bd1e081 | 1693 | perror("start consumer fork"); |
8c0faa1d | 1694 | ret = -errno; |
8c0faa1d | 1695 | } |
8f4905da | 1696 | error: |
8c0faa1d DG |
1697 | return ret; |
1698 | } | |
1699 | ||
693bd40b | 1700 | /* |
3bd1e081 | 1701 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1702 | */ |
3bd1e081 | 1703 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1704 | { |
1705 | int ret; | |
1706 | ||
3bd1e081 MD |
1707 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1708 | if (consumer_data->pid != 0) { | |
1709 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1710 | goto end; |
1711 | } | |
693bd40b | 1712 | |
3bd1e081 | 1713 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1714 | if (ret < 0) { |
3bd1e081 MD |
1715 | ERR("Spawning consumerd failed"); |
1716 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1717 | goto error; |
693bd40b | 1718 | } |
c49dc785 | 1719 | |
3bd1e081 MD |
1720 | /* Setting up the consumer_data pid */ |
1721 | consumer_data->pid = ret; | |
48842b30 | 1722 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1723 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1724 | |
3bd1e081 MD |
1725 | DBG2("Spawning consumer control thread"); |
1726 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1727 | if (ret < 0) { |
3bd1e081 | 1728 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1729 | goto error; |
1730 | } | |
1731 | ||
c49dc785 | 1732 | end: |
693bd40b DG |
1733 | return 0; |
1734 | ||
1735 | error: | |
1736 | return ret; | |
1737 | } | |
1738 | ||
b73401da | 1739 | /* |
d063d709 | 1740 | * modprobe_kernel_modules |
b73401da DG |
1741 | */ |
1742 | static int modprobe_kernel_modules(void) | |
1743 | { | |
ab147185 | 1744 | int ret = 0, i; |
b73401da DG |
1745 | char modprobe[256]; |
1746 | ||
ab147185 MD |
1747 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1748 | ret = snprintf(modprobe, sizeof(modprobe), | |
1749 | "/sbin/modprobe %s%s", | |
24b487b8 | 1750 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1751 | kernel_modules_list[i].name); |
b73401da DG |
1752 | if (ret < 0) { |
1753 | perror("snprintf modprobe"); | |
1754 | goto error; | |
1755 | } | |
ab147185 | 1756 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1757 | ret = system(modprobe); |
ab147185 MD |
1758 | if (ret == -1) { |
1759 | ERR("Unable to launch modprobe for module %s", | |
1760 | kernel_modules_list[i].name); | |
1761 | } else if (kernel_modules_list[i].required | |
d9800920 | 1762 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1763 | ERR("Unable to load module %s", |
1764 | kernel_modules_list[i].name); | |
1765 | } else { | |
1766 | DBG("Modprobe successfully %s", | |
1767 | kernel_modules_list[i].name); | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | error: | |
1772 | return ret; | |
1773 | } | |
1774 | ||
b73401da | 1775 | /* |
d063d709 | 1776 | * mount_debugfs |
b73401da DG |
1777 | */ |
1778 | static int mount_debugfs(char *path) | |
1779 | { | |
1780 | int ret; | |
1781 | char *type = "debugfs"; | |
1782 | ||
996b65c8 | 1783 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1784 | if (ret < 0) { |
7272acf5 | 1785 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1786 | goto error; |
1787 | } | |
1788 | ||
1789 | ret = mount(type, path, type, 0, NULL); | |
1790 | if (ret < 0) { | |
7272acf5 | 1791 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1792 | goto error; |
1793 | } | |
1794 | ||
1795 | DBG("Mounted debugfs successfully at %s", path); | |
1796 | ||
1797 | error: | |
1798 | return ret; | |
1799 | } | |
1800 | ||
8c0faa1d | 1801 | /* |
d063d709 | 1802 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1803 | */ |
f3ed775e | 1804 | static void init_kernel_tracer(void) |
8c0faa1d | 1805 | { |
b73401da DG |
1806 | int ret; |
1807 | char *proc_mounts = "/proc/mounts"; | |
1808 | char line[256]; | |
684d34d2 | 1809 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1810 | FILE *fp; |
1811 | ||
1812 | /* Detect debugfs */ | |
1813 | fp = fopen(proc_mounts, "r"); | |
1814 | if (fp == NULL) { | |
1815 | ERR("Unable to probe %s", proc_mounts); | |
1816 | goto error; | |
1817 | } | |
1818 | ||
1819 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1820 | if (strstr(line, "debugfs") != NULL) { | |
1821 | /* Remove first string */ | |
1822 | strtok(line, " "); | |
1823 | /* Dup string here so we can reuse line later on */ | |
1824 | debugfs_path = strdup(strtok(NULL, " ")); | |
1825 | DBG("Got debugfs path : %s", debugfs_path); | |
1826 | break; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | fclose(fp); | |
1831 | ||
1832 | /* Mount debugfs if needded */ | |
1833 | if (debugfs_path == NULL) { | |
1834 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1835 | if (ret < 0) { | |
1836 | perror("asprintf debugfs path"); | |
1837 | goto error; | |
1838 | } | |
1839 | ret = mount_debugfs(debugfs_path); | |
1840 | if (ret < 0) { | |
7272acf5 | 1841 | perror("Cannot mount debugfs"); |
b73401da DG |
1842 | goto error; |
1843 | } | |
1844 | } | |
1845 | ||
1846 | /* Modprobe lttng kernel modules */ | |
1847 | ret = modprobe_kernel_modules(); | |
1848 | if (ret < 0) { | |
1849 | goto error; | |
1850 | } | |
1851 | ||
1852 | /* Setup lttng kernel path */ | |
1853 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1854 | if (ret < 0) { | |
1855 | perror("asprintf lttng path"); | |
1856 | goto error; | |
1857 | } | |
1858 | ||
1859 | /* Open debugfs lttng */ | |
1860 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1861 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1862 | DBG("Failed to open %s", lttng_path); |
1863 | goto error; | |
8c0faa1d DG |
1864 | } |
1865 | ||
b73401da DG |
1866 | free(lttng_path); |
1867 | free(debugfs_path); | |
f3ed775e | 1868 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1869 | return; |
1870 | ||
1871 | error: | |
1872 | if (lttng_path) { | |
1873 | free(lttng_path); | |
1874 | } | |
1875 | if (debugfs_path) { | |
1876 | free(debugfs_path); | |
1877 | } | |
1878 | WARN("No kernel tracer available"); | |
1879 | kernel_tracer_fd = 0; | |
1880 | return; | |
f3ed775e | 1881 | } |
33a2b854 | 1882 | |
f3ed775e | 1883 | /* |
54d01ffb | 1884 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1885 | */ |
54d01ffb | 1886 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1887 | { |
f40799e8 | 1888 | int ret = 0; |
8c0faa1d | 1889 | |
3bd1e081 | 1890 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1891 | /* |
54d01ffb DG |
1892 | * Assign default kernel consumer socket if no consumer assigned to the |
1893 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1894 | * an extra security check. | |
d9800920 DG |
1895 | */ |
1896 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1897 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1898 | } |
1899 | ||
2bdd86d4 | 1900 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1901 | if (ret < 0) { |
f3ed775e DG |
1902 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1903 | goto error; | |
1904 | } | |
1d4b027a | 1905 | |
3bd1e081 | 1906 | session->consumer_fds_sent = 1; |
f3ed775e | 1907 | } |
1d4b027a DG |
1908 | |
1909 | error: | |
1910 | return ret; | |
8c0faa1d DG |
1911 | } |
1912 | ||
0177d773 DG |
1913 | /* |
1914 | * Create an UST session and add it to the session ust list. | |
1915 | */ | |
44d3bd01 DG |
1916 | static int create_ust_session(struct ltt_session *session, |
1917 | struct lttng_domain *domain) | |
0177d773 | 1918 | { |
44d3bd01 | 1919 | int ret; |
48842b30 | 1920 | unsigned int uid; |
13384287 | 1921 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1922 | |
1923 | switch (domain->type) { | |
48842b30 | 1924 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1925 | break; |
1926 | default: | |
13384287 | 1927 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1928 | goto error; |
1929 | } | |
0177d773 DG |
1930 | |
1931 | DBG("Creating UST session"); | |
1932 | ||
44e96653 | 1933 | uid = session->uid; |
48842b30 | 1934 | lus = trace_ust_create_session(session->path, uid, domain); |
0177d773 | 1935 | if (lus == NULL) { |
44d3bd01 | 1936 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1937 | goto error; |
1938 | } | |
1939 | ||
48842b30 | 1940 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1941 | geteuid(), allowed_group()); |
1942 | if (ret < 0) { | |
1943 | if (ret != -EEXIST) { | |
1944 | ERR("Trace directory creation error"); | |
44d3bd01 | 1945 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1946 | goto error; |
1947 | } | |
1948 | } | |
1949 | ||
f6a9efaa DG |
1950 | /* The domain type dictate different actions on session creation */ |
1951 | switch (domain->type) { | |
48842b30 DG |
1952 | case LTTNG_DOMAIN_UST: |
1953 | /* No ustctl for the global UST domain */ | |
1954 | break; | |
1955 | default: | |
36dc12cc | 1956 | ERR("Unknown UST domain on create session %d", domain->type); |
0177d773 DG |
1957 | goto error; |
1958 | } | |
f6a9efaa | 1959 | session->ust_session = lus; |
44d3bd01 DG |
1960 | |
1961 | return LTTCOMM_OK; | |
0177d773 DG |
1962 | |
1963 | error: | |
1964 | free(lus); | |
1965 | return ret; | |
1966 | } | |
1967 | ||
333f285e | 1968 | /* |
d063d709 | 1969 | * Create a kernel tracer session then create the default channel. |
333f285e | 1970 | */ |
f3ed775e | 1971 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1972 | { |
f3ed775e | 1973 | int ret; |
f3ed775e DG |
1974 | |
1975 | DBG("Creating kernel session"); | |
1976 | ||
1977 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1978 | if (ret < 0) { | |
1979 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1980 | goto error; | |
333f285e DG |
1981 | } |
1982 | ||
d9800920 | 1983 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1984 | if (kconsumer_data.cmd_sock) { |
1985 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1986 | } |
1987 | ||
63053e7c DG |
1988 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1989 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1990 | if (ret < 0) { |
996b65c8 | 1991 | if (ret != -EEXIST) { |
7a485870 DG |
1992 | ERR("Trace directory creation error"); |
1993 | goto error; | |
1994 | } | |
1995 | } | |
1996 | ||
f3ed775e DG |
1997 | error: |
1998 | return ret; | |
333f285e DG |
1999 | } |
2000 | ||
6c9cc2ab DG |
2001 | /* |
2002 | * Using the session list, filled a lttng_session array to send back to the | |
2003 | * client for session listing. | |
2004 | * | |
2005 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2006 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
2007 | */ |
2008 | static void list_lttng_sessions(struct lttng_session *sessions) | |
2009 | { | |
2010 | int i = 0; | |
2011 | struct ltt_session *session; | |
2012 | ||
2013 | DBG("Getting all available session"); | |
2014 | /* | |
2015 | * Iterate over session list and append data after the control struct in | |
2016 | * the buffer. | |
2017 | */ | |
2018 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
2019 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 2020 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2021 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2022 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2023 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2024 | i++; |
2025 | } | |
2026 | } | |
2027 | ||
9f19cc17 DG |
2028 | /* |
2029 | * Fill lttng_channel array of all channels. | |
2030 | */ | |
b551a063 | 2031 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2032 | struct lttng_channel *channels) |
2033 | { | |
2034 | int i = 0; | |
2035 | struct ltt_kernel_channel *kchan; | |
2036 | ||
2037 | DBG("Listing channels for session %s", session->name); | |
2038 | ||
b551a063 DG |
2039 | switch (domain) { |
2040 | case LTTNG_DOMAIN_KERNEL: | |
2041 | /* Kernel channels */ | |
2042 | if (session->kernel_session != NULL) { | |
2043 | cds_list_for_each_entry(kchan, | |
2044 | &session->kernel_session->channel_list.head, list) { | |
2045 | /* Copy lttng_channel struct to array */ | |
2046 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2047 | channels[i].enabled = kchan->enabled; | |
2048 | i++; | |
2049 | } | |
2050 | } | |
2051 | break; | |
2052 | case LTTNG_DOMAIN_UST: | |
2053 | { | |
2054 | struct cds_lfht_iter iter; | |
2055 | struct ltt_ust_channel *uchan; | |
2056 | ||
2057 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
2058 | &iter, uchan, node) { | |
2059 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
2060 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2061 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2062 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2063 | channels[i].attr.switch_timer_interval = | |
2064 | uchan->attr.switch_timer_interval; | |
2065 | channels[i].attr.read_timer_interval = | |
2066 | uchan->attr.read_timer_interval; | |
aea829b3 | 2067 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2068 | switch (uchan->attr.output) { |
2069 | case LTTNG_UST_MMAP: | |
2070 | default: | |
2071 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2072 | break; | |
2073 | } | |
9f19cc17 DG |
2074 | i++; |
2075 | } | |
b551a063 DG |
2076 | break; |
2077 | } | |
2078 | default: | |
2079 | break; | |
9f19cc17 | 2080 | } |
b551a063 | 2081 | } |
9f19cc17 | 2082 | |
b551a063 DG |
2083 | /* |
2084 | * Create a list of ust global domain events. | |
2085 | */ | |
2086 | static int list_lttng_ust_global_events(char *channel_name, | |
2087 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2088 | { | |
2089 | int i = 0, ret = 0; | |
2090 | unsigned int nb_event = 0; | |
2091 | struct cds_lfht_iter iter; | |
d7b75b30 | 2092 | struct cds_lfht_node *node; |
b551a063 DG |
2093 | struct ltt_ust_channel *uchan; |
2094 | struct ltt_ust_event *uevent; | |
2095 | struct lttng_event *tmp; | |
2096 | ||
2097 | DBG("Listing UST global events for channel %s", channel_name); | |
2098 | ||
2099 | rcu_read_lock(); | |
2100 | ||
d7b75b30 DG |
2101 | node = hashtable_lookup(ust_global->channels, (void *) channel_name, |
2102 | strlen(channel_name), &iter); | |
2103 | if (node == NULL) { | |
2104 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2105 | goto error; | |
b551a063 DG |
2106 | } |
2107 | ||
d7b75b30 DG |
2108 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
2109 | ||
2110 | nb_event += hashtable_get_count(uchan->events); | |
2111 | ||
b551a063 DG |
2112 | if (nb_event == 0) { |
2113 | ret = nb_event; | |
2114 | goto error; | |
2115 | } | |
2116 | ||
2117 | DBG3("Listing UST global %d events", nb_event); | |
2118 | ||
2119 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2120 | if (tmp == NULL) { | |
2121 | ret = -LTTCOMM_FATAL; | |
2122 | goto error; | |
2123 | } | |
2124 | ||
d7b75b30 DG |
2125 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
2126 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
2127 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2128 | tmp[i].enabled = uevent->enabled; | |
2129 | switch (uevent->attr.instrumentation) { | |
2130 | case LTTNG_UST_TRACEPOINT: | |
2131 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2132 | break; | |
2133 | case LTTNG_UST_PROBE: | |
2134 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2135 | break; | |
2136 | case LTTNG_UST_FUNCTION: | |
2137 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2138 | break; | |
ac3bd9c0 MD |
2139 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
2140 | /* TODO */ | |
2141 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
2142 | goto error; | |
2143 | break; | |
9f19cc17 | 2144 | } |
d7b75b30 | 2145 | i++; |
9f19cc17 DG |
2146 | } |
2147 | ||
b551a063 DG |
2148 | ret = nb_event; |
2149 | *events = tmp; | |
2150 | ||
2151 | error: | |
2152 | rcu_read_unlock(); | |
2153 | return ret; | |
9f19cc17 DG |
2154 | } |
2155 | ||
2156 | /* | |
b551a063 | 2157 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2158 | */ |
b551a063 DG |
2159 | static int list_lttng_kernel_events(char *channel_name, |
2160 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2161 | { |
b551a063 DG |
2162 | int i = 0, ret; |
2163 | unsigned int nb_event; | |
9f19cc17 | 2164 | struct ltt_kernel_event *event; |
b551a063 DG |
2165 | struct ltt_kernel_channel *kchan; |
2166 | ||
2167 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2168 | if (kchan == NULL) { | |
2169 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2170 | goto error; | |
2171 | } | |
2172 | ||
2173 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2174 | |
2175 | DBG("Listing events for channel %s", kchan->channel->name); | |
2176 | ||
b551a063 DG |
2177 | if (nb_event == 0) { |
2178 | ret = nb_event; | |
2179 | goto error; | |
2180 | } | |
2181 | ||
2182 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2183 | if (*events == NULL) { | |
2184 | ret = LTTCOMM_FATAL; | |
2185 | goto error; | |
2186 | } | |
2187 | ||
9f19cc17 DG |
2188 | /* Kernel channels */ |
2189 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2190 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2191 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2192 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2193 | switch (event->event->instrumentation) { |
2194 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2195 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2196 | break; |
2197 | case LTTNG_KERNEL_KPROBE: | |
2198 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2199 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2200 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2201 | sizeof(struct lttng_kernel_kprobe)); |
2202 | break; | |
2203 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2204 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2205 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2206 | sizeof(struct lttng_kernel_function)); |
2207 | break; | |
0133c199 | 2208 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2209 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2210 | break; |
a54bd42d | 2211 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2212 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2213 | break; |
7a3d1328 MD |
2214 | case LTTNG_KERNEL_ALL: |
2215 | assert(0); | |
2216 | break; | |
9f19cc17 DG |
2217 | } |
2218 | i++; | |
2219 | } | |
b551a063 DG |
2220 | |
2221 | return nb_event; | |
2222 | ||
2223 | error: | |
2224 | return ret; | |
9f19cc17 DG |
2225 | } |
2226 | ||
fac6795d | 2227 | /* |
54d01ffb | 2228 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2229 | */ |
54d01ffb DG |
2230 | static int cmd_disable_channel(struct ltt_session *session, |
2231 | int domain, char *channel_name) | |
fac6795d | 2232 | { |
54d01ffb | 2233 | int ret; |
78f0bacd DG |
2234 | struct ltt_ust_session *usess; |
2235 | ||
2236 | usess = session->ust_session; | |
379473d2 | 2237 | |
54d01ffb | 2238 | switch (domain) { |
78f0bacd DG |
2239 | case LTTNG_DOMAIN_KERNEL: |
2240 | { | |
2241 | ret = channel_kernel_disable(session->kernel_session, | |
2242 | channel_name); | |
2243 | if (ret != LTTCOMM_OK) { | |
2244 | goto error; | |
2245 | } | |
54d01ffb | 2246 | |
78f0bacd DG |
2247 | kernel_wait_quiescent(kernel_tracer_fd); |
2248 | break; | |
2249 | } | |
2250 | case LTTNG_DOMAIN_UST: | |
2251 | { | |
2252 | struct ltt_ust_channel *uchan; | |
2253 | ||
2254 | /* Get channel in global UST domain HT */ | |
2255 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2256 | channel_name); | |
2257 | if (uchan == NULL) { | |
2258 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2259 | goto error; |
78f0bacd DG |
2260 | } |
2261 | ||
8535a6d9 DG |
2262 | /* Already disabled */ |
2263 | if (!uchan->enabled) { | |
2264 | DBG2("UST channel %s already disabled", channel_name); | |
44d3bd01 | 2265 | break; |
8535a6d9 DG |
2266 | } |
2267 | ||
35a9059d | 2268 | ret = ust_app_disable_channel_glb(usess, uchan); |
78f0bacd DG |
2269 | if (ret < 0) { |
2270 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
54d01ffb | 2271 | goto error; |
78f0bacd DG |
2272 | } |
2273 | ||
2274 | uchan->enabled = 0; | |
2275 | ||
2276 | break; | |
2277 | } | |
2278 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2279 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2280 | case LTTNG_DOMAIN_UST_PID: | |
2281 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2282 | goto error; | |
2283 | default: | |
2284 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2285 | goto error; | |
20fe2104 DG |
2286 | } |
2287 | ||
54d01ffb | 2288 | ret = LTTCOMM_OK; |
d65106b1 | 2289 | |
54d01ffb DG |
2290 | error: |
2291 | return ret; | |
2292 | } | |
2293 | ||
56fff090 DG |
2294 | /* |
2295 | * Copy channel from attributes and set it in the application channel list. | |
2296 | */ | |
f6a9efaa | 2297 | /* |
56fff090 DG |
2298 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2299 | struct lttng_channel *attr, struct ust_app *app) | |
2300 | { | |
2301 | int ret; | |
2302 | struct ltt_ust_channel *uchan, *new_chan; | |
2303 | ||
f6a9efaa | 2304 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2305 | if (uchan == NULL) { |
2306 | ret = LTTCOMM_FATAL; | |
2307 | goto error; | |
2308 | } | |
2309 | ||
2310 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2311 | if (new_chan == NULL) { | |
2312 | PERROR("malloc ltt_ust_channel"); | |
2313 | ret = LTTCOMM_FATAL; | |
2314 | goto error; | |
2315 | } | |
2316 | ||
2317 | ret = channel_ust_copy(new_chan, uchan); | |
2318 | if (ret < 0) { | |
2319 | ret = LTTCOMM_FATAL; | |
2320 | goto error; | |
2321 | } | |
2322 | ||
56fff090 DG |
2323 | error: |
2324 | return ret; | |
2325 | } | |
f6a9efaa | 2326 | */ |
56fff090 | 2327 | |
54d01ffb DG |
2328 | /* |
2329 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2330 | */ | |
44d3bd01 | 2331 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2332 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2333 | { |
2334 | int ret; | |
f6a9efaa DG |
2335 | struct ltt_ust_session *usess = session->ust_session; |
2336 | ||
5d56b5aa | 2337 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2338 | |
aea829b3 | 2339 | switch (domain) { |
44d3bd01 DG |
2340 | case LTTNG_DOMAIN_KERNEL: |
2341 | { | |
2342 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2343 | |
44d3bd01 DG |
2344 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2345 | session->kernel_session); | |
2346 | if (kchan == NULL) { | |
2347 | ret = channel_kernel_create(session->kernel_session, | |
2348 | attr, kernel_poll_pipe[1]); | |
2349 | } else { | |
2350 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2351 | } | |
2352 | ||
2353 | if (ret != LTTCOMM_OK) { | |
2354 | goto error; | |
2355 | } | |
2356 | ||
2357 | kernel_wait_quiescent(kernel_tracer_fd); | |
2358 | break; | |
2359 | } | |
f6a9efaa DG |
2360 | case LTTNG_DOMAIN_UST: |
2361 | { | |
2362 | struct ltt_ust_channel *uchan; | |
2363 | ||
48842b30 | 2364 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2365 | |
48842b30 | 2366 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2367 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2368 | attr->name); | |
2369 | if (uchan == NULL) { | |
48842b30 | 2370 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2371 | if (uchan == NULL) { |
2372 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2373 | goto error; | |
2374 | } | |
d5cd1f34 | 2375 | |
78f0bacd | 2376 | /* Add channel to all registered applications */ |
35a9059d | 2377 | ret = ust_app_create_channel_glb(usess, uchan); |
78f0bacd DG |
2378 | if (ret != 0) { |
2379 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2380 | goto error; | |
2381 | } | |
8535a6d9 | 2382 | |
f6a9efaa DG |
2383 | rcu_read_lock(); |
2384 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2385 | rcu_read_unlock(); | |
8535a6d9 | 2386 | |
48842b30 | 2387 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa | 2388 | } else { |
78f0bacd DG |
2389 | /* If already enabled, everything is OK */ |
2390 | if (uchan->enabled) { | |
8535a6d9 | 2391 | break; |
78f0bacd | 2392 | } |
f6a9efaa | 2393 | |
35a9059d | 2394 | ret = ust_app_enable_channel_glb(usess, uchan); |
78f0bacd | 2395 | if (ret < 0) { |
8535a6d9 DG |
2396 | if (ret != -EEXIST) { |
2397 | ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; | |
2398 | goto error; | |
2399 | } else { | |
2400 | ret = LTTCOMM_OK; | |
2401 | } | |
78f0bacd | 2402 | } |
48842b30 | 2403 | } |
f6a9efaa | 2404 | |
37357452 DG |
2405 | uchan->enabled = 1; |
2406 | ||
f6a9efaa DG |
2407 | break; |
2408 | } | |
78f0bacd DG |
2409 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2410 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2411 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2412 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2413 | goto error; | |
44d3bd01 DG |
2414 | default: |
2415 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2416 | goto error; | |
54d01ffb DG |
2417 | } |
2418 | ||
2419 | ret = LTTCOMM_OK; | |
2420 | ||
2421 | error: | |
2422 | return ret; | |
2423 | } | |
2424 | ||
2425 | /* | |
2426 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2427 | */ | |
2428 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2429 | char *channel_name, char *event_name) | |
2430 | { | |
2431 | int ret; | |
54d01ffb DG |
2432 | |
2433 | switch (domain) { | |
2434 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2435 | { |
2436 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2437 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2438 | |
b0a40d28 DG |
2439 | ksess = session->kernel_session; |
2440 | ||
2441 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2442 | if (kchan == NULL) { |
2443 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2444 | goto error; | |
d65106b1 DG |
2445 | } |
2446 | ||
b0a40d28 | 2447 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2448 | if (ret != LTTCOMM_OK) { |
2449 | goto error; | |
2450 | } | |
2451 | ||
2452 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2453 | break; |
2bdd86d4 MD |
2454 | } |
2455 | case LTTNG_DOMAIN_UST: | |
b0a40d28 DG |
2456 | { |
2457 | struct ltt_ust_session *usess; | |
2458 | struct ltt_ust_channel *uchan; | |
35a9059d | 2459 | struct ltt_ust_event *uevent; |
b0a40d28 DG |
2460 | |
2461 | usess = session->ust_session; | |
2462 | ||
2463 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2464 | channel_name); | |
2465 | if (uchan == NULL) { | |
2466 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2467 | goto error; | |
2468 | } | |
2469 | ||
35a9059d DG |
2470 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
2471 | if (uevent == NULL) { | |
2472 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
2473 | goto error; | |
2474 | } | |
2475 | ||
2476 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
b0a40d28 DG |
2477 | if (ret < 0) { |
2478 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
2479 | goto error; | |
2480 | } | |
2481 | ||
35a9059d DG |
2482 | uevent->enabled = 0; |
2483 | ||
b0a40d28 DG |
2484 | DBG2("Disable UST event %s in channel %s completed", event_name, |
2485 | channel_name); | |
2486 | ||
2487 | break; | |
2488 | } | |
2bdd86d4 MD |
2489 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2490 | case LTTNG_DOMAIN_UST_PID: | |
2491 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2492 | default: |
54d01ffb DG |
2493 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2494 | goto error; | |
d65106b1 | 2495 | } |
26cc6b4e | 2496 | |
54d01ffb DG |
2497 | ret = LTTCOMM_OK; |
2498 | ||
2499 | error: | |
2500 | return ret; | |
2501 | } | |
2502 | ||
2503 | /* | |
2504 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2505 | */ | |
2506 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2507 | char *channel_name) | |
2508 | { | |
2509 | int ret; | |
54d01ffb DG |
2510 | |
2511 | switch (domain) { | |
2512 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2513 | { |
2514 | struct ltt_kernel_session *ksess; | |
2515 | struct ltt_kernel_channel *kchan; | |
2516 | ||
2517 | ksess = session->kernel_session; | |
2518 | ||
2519 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2520 | if (kchan == NULL) { |
2521 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2522 | goto error; | |
26cc6b4e DG |
2523 | } |
2524 | ||
9730260e | 2525 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2526 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2527 | goto error; |
26cc6b4e DG |
2528 | } |
2529 | ||
54d01ffb | 2530 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2531 | break; |
9730260e DG |
2532 | } |
2533 | case LTTNG_DOMAIN_UST: | |
2534 | { | |
2535 | struct ltt_ust_session *usess; | |
2536 | struct ltt_ust_channel *uchan; | |
2537 | ||
2538 | usess = session->ust_session; | |
2539 | ||
2540 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2541 | channel_name); | |
2542 | if (uchan == NULL) { | |
2543 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2544 | goto error; | |
2545 | } | |
2546 | ||
35a9059d | 2547 | ret = ust_app_disable_all_event_glb(usess, uchan); |
9730260e DG |
2548 | if (ret < 0) { |
2549 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
2550 | goto error; | |
2551 | } | |
2552 | ||
2553 | DBG2("Disable all UST event in channel %s completed", channel_name); | |
2554 | ||
2555 | break; | |
2556 | } | |
2557 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2558 | case LTTNG_DOMAIN_UST_PID: | |
2559 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2560 | default: |
54d01ffb DG |
2561 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2562 | goto error; | |
26cc6b4e | 2563 | } |
e953ef25 | 2564 | |
54d01ffb | 2565 | ret = LTTCOMM_OK; |
e953ef25 | 2566 | |
54d01ffb DG |
2567 | error: |
2568 | return ret; | |
2569 | } | |
f5177a38 | 2570 | |
54d01ffb DG |
2571 | /* |
2572 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2573 | */ | |
2574 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2575 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2576 | { | |
2577 | int ret; | |
f5177a38 | 2578 | |
54d01ffb DG |
2579 | switch (domain) { |
2580 | case LTTNG_DOMAIN_KERNEL: | |
2581 | /* Add kernel context to kernel tracer */ | |
2582 | ret = context_kernel_add(session->kernel_session, ctx, | |
2583 | event_name, channel_name); | |
2584 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2585 | goto error; |
e953ef25 | 2586 | } |
2bdd86d4 MD |
2587 | break; |
2588 | case LTTNG_DOMAIN_UST: | |
2589 | { | |
55cc08a6 | 2590 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2591 | |
55cc08a6 DG |
2592 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2593 | if (ret != LTTCOMM_OK) { | |
2594 | goto error; | |
2bdd86d4 | 2595 | } |
e953ef25 | 2596 | break; |
2bdd86d4 | 2597 | } |
55cc08a6 DG |
2598 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2599 | case LTTNG_DOMAIN_UST_PID: | |
2600 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2601 | default: |
54d01ffb DG |
2602 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2603 | goto error; | |
e953ef25 | 2604 | } |
950131af | 2605 | |
54d01ffb | 2606 | ret = LTTCOMM_OK; |
950131af | 2607 | |
54d01ffb DG |
2608 | error: |
2609 | return ret; | |
2610 | } | |
2611 | ||
2612 | /* | |
2613 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2614 | */ | |
2615 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2616 | char *channel_name, struct lttng_event *event) | |
2617 | { | |
2618 | int ret; | |
f6cd6b0f | 2619 | struct lttng_channel *attr; |
48842b30 | 2620 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2621 | |
2622 | switch (domain) { | |
2623 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2624 | { |
2625 | struct ltt_kernel_channel *kchan; | |
2626 | ||
54d01ffb DG |
2627 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2628 | session->kernel_session); | |
2629 | if (kchan == NULL) { | |
f6cd6b0f DG |
2630 | attr = channel_new_default_attr(domain); |
2631 | if (attr == NULL) { | |
2632 | ret = LTTCOMM_FATAL; | |
2633 | goto error; | |
2634 | } | |
2635 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2636 | ||
54d01ffb | 2637 | /* This call will notify the kernel thread */ |
44d3bd01 | 2638 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2639 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2640 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2641 | free(attr); |
f5177a38 DG |
2642 | goto error; |
2643 | } | |
ff4d74e6 | 2644 | free(attr); |
54d01ffb | 2645 | } |
950131af | 2646 | |
54d01ffb DG |
2647 | /* Get the newly created kernel channel pointer */ |
2648 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2649 | session->kernel_session); | |
2650 | if (kchan == NULL) { | |
2651 | /* This sould not happen... */ | |
2652 | ret = LTTCOMM_FATAL; | |
2653 | goto error; | |
2654 | } | |
f5177a38 | 2655 | |
48842b30 DG |
2656 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2657 | event); | |
54d01ffb | 2658 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2659 | goto error; |
950131af DG |
2660 | } |
2661 | ||
54d01ffb | 2662 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2663 | break; |
2bdd86d4 MD |
2664 | } |
2665 | case LTTNG_DOMAIN_UST: | |
2666 | { | |
aea829b3 | 2667 | struct lttng_channel *attr; |
48842b30 | 2668 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2669 | |
edb67388 | 2670 | /* Get channel from global UST domain */ |
48842b30 DG |
2671 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2672 | channel_name); | |
2673 | if (uchan == NULL) { | |
aea829b3 DG |
2674 | /* Create default channel */ |
2675 | attr = channel_new_default_attr(domain); | |
2676 | if (attr == NULL) { | |
2677 | ret = LTTCOMM_FATAL; | |
2678 | goto error; | |
2679 | } | |
596219f7 | 2680 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2681 | attr->name[NAME_MAX - 1] = '\0'; |
2bdd86d4 | 2682 | |
aea829b3 DG |
2683 | /* Use the internal command enable channel */ |
2684 | ret = cmd_enable_channel(session, domain, attr); | |
edb67388 | 2685 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2686 | free(attr); |
aea829b3 DG |
2687 | goto error; |
2688 | } | |
aea829b3 DG |
2689 | free(attr); |
2690 | ||
2691 | /* Get the newly created channel reference back */ | |
2692 | uchan = trace_ust_find_channel_by_name( | |
2693 | usess->domain_global.channels, channel_name); | |
2694 | if (uchan == NULL) { | |
2695 | /* Something is really wrong */ | |
2bdd86d4 MD |
2696 | ret = LTTCOMM_FATAL; |
2697 | goto error; | |
2698 | } | |
48842b30 | 2699 | } |
2bdd86d4 | 2700 | |
edb67388 | 2701 | /* At this point, the session and channel exist on the tracer */ |
d5cd1f34 | 2702 | |
edb67388 DG |
2703 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2704 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2705 | goto error; |
2bdd86d4 MD |
2706 | } |
2707 | break; | |
2708 | } | |
2709 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2710 | case LTTNG_DOMAIN_UST_PID: | |
2711 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2712 | default: |
54d01ffb DG |
2713 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2714 | goto error; | |
950131af | 2715 | } |
d36b8583 | 2716 | |
54d01ffb | 2717 | ret = LTTCOMM_OK; |
d36b8583 | 2718 | |
54d01ffb DG |
2719 | error: |
2720 | return ret; | |
2721 | } | |
7d29a247 | 2722 | |
54d01ffb DG |
2723 | /* |
2724 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2725 | */ | |
2726 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2727 | char *channel_name, int event_type) |
54d01ffb DG |
2728 | { |
2729 | int ret; | |
2730 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2731 | |
54d01ffb DG |
2732 | switch (domain) { |
2733 | case LTTNG_DOMAIN_KERNEL: | |
2734 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2735 | session->kernel_session); | |
2736 | if (kchan == NULL) { | |
2737 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2738 | ret = channel_kernel_create(session->kernel_session, NULL, |
2739 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2740 | if (ret != LTTCOMM_OK) { |
2741 | goto error; | |
d36b8583 | 2742 | } |
0d0c377a | 2743 | |
8f69e5eb DG |
2744 | /* Get the newly created kernel channel pointer */ |
2745 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2746 | session->kernel_session); | |
2747 | if (kchan == NULL) { | |
2748 | /* This sould not happen... */ | |
2749 | ret = LTTCOMM_FATAL; | |
2750 | goto error; | |
2751 | } | |
2752 | ||
54d01ffb | 2753 | } |
0fdd1e2c | 2754 | |
7a3d1328 MD |
2755 | switch (event_type) { |
2756 | case LTTNG_KERNEL_SYSCALL: | |
2757 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2758 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2759 | break; |
2760 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2761 | /* |
7a3d1328 MD |
2762 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2763 | * events already registered to the channel. | |
8c9ae521 | 2764 | */ |
7a3d1328 MD |
2765 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2766 | kchan, kernel_tracer_fd); | |
2767 | break; | |
2768 | case LTTNG_KERNEL_ALL: | |
2769 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2770 | ret = event_kernel_enable_all(session->kernel_session, |
2771 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2772 | break; |
2773 | default: | |
2774 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2775 | goto error; | |
8c9ae521 | 2776 | } |
8f69e5eb DG |
2777 | |
2778 | /* Manage return value */ | |
54d01ffb | 2779 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2780 | goto error; |
d36b8583 DG |
2781 | } |
2782 | ||
54d01ffb | 2783 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2784 | break; |
54d01ffb DG |
2785 | default: |
2786 | /* TODO: Userspace tracing */ | |
2787 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2788 | goto error; | |
d36b8583 | 2789 | } |
f3ed775e | 2790 | |
54d01ffb DG |
2791 | ret = LTTCOMM_OK; |
2792 | ||
2793 | error: | |
2794 | return ret; | |
2795 | } | |
2796 | ||
2797 | /* | |
2798 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2799 | */ | |
2800 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2801 | { | |
2802 | int ret; | |
2803 | ssize_t nb_events = 0; | |
2804 | ||
2805 | switch (domain) { | |
2806 | case LTTNG_DOMAIN_KERNEL: | |
2807 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2808 | if (nb_events < 0) { | |
2809 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2810 | goto error; | |
894be886 | 2811 | } |
54d01ffb | 2812 | break; |
b551a063 DG |
2813 | case LTTNG_DOMAIN_UST: |
2814 | nb_events = ust_app_list_events(events); | |
2815 | if (nb_events < 0) { | |
2816 | ret = LTTCOMM_UST_LIST_FAIL; | |
2817 | goto error; | |
2818 | } | |
2819 | break; | |
54d01ffb | 2820 | default: |
54d01ffb DG |
2821 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2822 | goto error; | |
2823 | } | |
894be886 | 2824 | |
54d01ffb | 2825 | return nb_events; |
7d29a247 | 2826 | |
54d01ffb DG |
2827 | error: |
2828 | /* Return negative value to differentiate return code */ | |
2829 | return -ret; | |
2830 | } | |
b389abbe | 2831 | |
54d01ffb DG |
2832 | /* |
2833 | * Command LTTNG_START_TRACE processed by the client thread. | |
2834 | */ | |
2835 | static int cmd_start_trace(struct ltt_session *session) | |
2836 | { | |
2837 | int ret; | |
54d01ffb | 2838 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2839 | struct ltt_ust_session *usess; |
b389abbe | 2840 | |
54d01ffb DG |
2841 | /* Short cut */ |
2842 | ksession = session->kernel_session; | |
b9d9b220 | 2843 | usess = session->ust_session; |
5eb91c98 | 2844 | |
464dd62d MD |
2845 | if (session->enabled) |
2846 | return LTTCOMM_UST_START_FAIL; | |
2847 | session->enabled = 1; | |
5eb91c98 | 2848 | |
54d01ffb DG |
2849 | /* Kernel tracing */ |
2850 | if (ksession != NULL) { | |
2bdd86d4 MD |
2851 | struct ltt_kernel_channel *kchan; |
2852 | ||
54d01ffb DG |
2853 | /* Open kernel metadata */ |
2854 | if (ksession->metadata == NULL) { | |
2855 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2856 | if (ret < 0) { | |
2857 | ret = LTTCOMM_KERN_META_FAIL; | |
2858 | goto error; | |
b389abbe | 2859 | } |
54d01ffb | 2860 | } |
7d29a247 | 2861 | |
54d01ffb DG |
2862 | /* Open kernel metadata stream */ |
2863 | if (ksession->metadata_stream_fd == 0) { | |
2864 | ret = kernel_open_metadata_stream(ksession); | |
2865 | if (ret < 0) { | |
2866 | ERR("Kernel create metadata stream failed"); | |
2867 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2868 | goto error; | |
2869 | } | |
2870 | } | |
2871 | ||
2872 | /* For each channel */ | |
2873 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2874 | if (kchan->stream_count == 0) { | |
2875 | ret = kernel_open_channel_stream(kchan); | |
2876 | if (ret < 0) { | |
2877 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2878 | goto error; |
2879 | } | |
54d01ffb DG |
2880 | /* Update the stream global counter */ |
2881 | ksession->stream_count_global += ret; | |
7d29a247 | 2882 | } |
54d01ffb DG |
2883 | } |
2884 | ||
2885 | /* Setup kernel consumer socket and send fds to it */ | |
2886 | ret = init_kernel_tracing(ksession); | |
2887 | if (ret < 0) { | |
2888 | ret = LTTCOMM_KERN_START_FAIL; | |
2889 | goto error; | |
2890 | } | |
2891 | ||
2892 | /* This start the kernel tracing */ | |
2893 | ret = kernel_start_session(ksession); | |
2894 | if (ret < 0) { | |
2895 | ret = LTTCOMM_KERN_START_FAIL; | |
2896 | goto error; | |
2897 | } | |
2898 | ||
2899 | /* Quiescent wait after starting trace */ | |
2900 | kernel_wait_quiescent(kernel_tracer_fd); | |
2901 | } | |
2902 | ||
36dc12cc | 2903 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2904 | if (usess) { |
2905 | usess->start_trace = 1; | |
36dc12cc | 2906 | |
b9d9b220 DG |
2907 | ret = ust_app_start_trace_all(usess); |
2908 | if (ret < 0) { | |
2909 | ret = LTTCOMM_UST_START_FAIL; | |
2910 | goto error; | |
2911 | } | |
2bdd86d4 | 2912 | } |
54d01ffb DG |
2913 | |
2914 | ret = LTTCOMM_OK; | |
2915 | ||
2916 | error: | |
2917 | return ret; | |
2918 | } | |
2919 | ||
2920 | /* | |
2921 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2922 | */ | |
2923 | static int cmd_stop_trace(struct ltt_session *session) | |
2924 | { | |
2925 | int ret; | |
2926 | struct ltt_kernel_channel *kchan; | |
2927 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2928 | struct ltt_ust_session *usess; |
54d01ffb DG |
2929 | |
2930 | /* Short cut */ | |
2931 | ksession = session->kernel_session; | |
8be98f9a | 2932 | usess = session->ust_session; |
54d01ffb | 2933 | |
464dd62d MD |
2934 | if (!session->enabled) |
2935 | return LTTCOMM_UST_START_FAIL; | |
2936 | session->enabled = 0; | |
54d01ffb DG |
2937 | |
2938 | /* Kernel tracer */ | |
2939 | if (ksession != NULL) { | |
2940 | DBG("Stop kernel tracing"); | |
2941 | ||
2942 | /* Flush all buffers before stopping */ | |
2943 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2944 | if (ret < 0) { | |
2945 | ERR("Kernel metadata flush failed"); | |
2946 | } | |
f34daff7 | 2947 | |
54d01ffb DG |
2948 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2949 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2950 | if (ret < 0) { |
54d01ffb | 2951 | ERR("Kernel flush buffer error"); |
7d29a247 | 2952 | } |
54d01ffb | 2953 | } |
19e70852 | 2954 | |
54d01ffb DG |
2955 | ret = kernel_stop_session(ksession); |
2956 | if (ret < 0) { | |
2957 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2958 | goto error; |
f3ed775e | 2959 | } |
54d01ffb DG |
2960 | |
2961 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2962 | } |
54d01ffb | 2963 | |
8be98f9a MD |
2964 | if (usess) { |
2965 | usess->start_trace = 0; | |
2bdd86d4 | 2966 | |
8be98f9a | 2967 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2968 | if (ret < 0) { |
8be98f9a | 2969 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2970 | goto error; |
2971 | } | |
2bdd86d4 | 2972 | } |
54d01ffb DG |
2973 | |
2974 | ret = LTTCOMM_OK; | |
2975 | ||
2976 | error: | |
2977 | return ret; | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2982 | */ | |
2983 | static int cmd_create_session(char *name, char *path) | |
2984 | { | |
2985 | int ret; | |
2986 | ||
2987 | ret = session_create(name, path); | |
2988 | if (ret != LTTCOMM_OK) { | |
2989 | goto error; | |
2990 | } | |
2991 | ||
2992 | ret = LTTCOMM_OK; | |
2993 | ||
2994 | error: | |
2995 | return ret; | |
2996 | } | |
2997 | ||
2998 | /* | |
2999 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3000 | */ | |
3001 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3002 | { | |
3003 | int ret; | |
3004 | ||
3005 | /* Clean kernel session teardown */ | |
3006 | teardown_kernel_session(session); | |
84cd17c6 MD |
3007 | /* UST session teardown */ |
3008 | teardown_ust_session(session); | |
54d01ffb DG |
3009 | |
3010 | /* | |
3011 | * Must notify the kernel thread here to update it's poll setin order | |
3012 | * to remove the channel(s)' fd just destroyed. | |
3013 | */ | |
3014 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3015 | if (ret < 0) { | |
3016 | perror("write kernel poll pipe"); | |
3017 | } | |
3018 | ||
271933a4 | 3019 | ret = session_destroy(session); |
54d01ffb DG |
3020 | |
3021 | return ret; | |
3022 | } | |
3023 | ||
3024 | /* | |
3025 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3026 | */ | |
3027 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3028 | { | |
3029 | int ret; | |
3030 | ||
3031 | switch (domain) { | |
3032 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3033 | { |
54d01ffb | 3034 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3035 | |
54d01ffb DG |
3036 | kcalibrate.type = calibrate->type; |
3037 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3038 | if (ret < 0) { |
54d01ffb DG |
3039 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3040 | goto error; | |
33a2b854 | 3041 | } |
54d01ffb DG |
3042 | break; |
3043 | } | |
3044 | default: | |
3045 | /* TODO: Userspace tracing */ | |
3046 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3047 | goto error; | |
3048 | } | |
33a2b854 | 3049 | |
54d01ffb | 3050 | ret = LTTCOMM_OK; |
33a2b854 | 3051 | |
54d01ffb DG |
3052 | error: |
3053 | return ret; | |
3054 | } | |
7d29a247 | 3055 | |
54d01ffb DG |
3056 | /* |
3057 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3058 | */ | |
3059 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3060 | char *sock_path) | |
3061 | { | |
3062 | int ret, sock; | |
b389abbe | 3063 | |
54d01ffb DG |
3064 | switch (domain) { |
3065 | case LTTNG_DOMAIN_KERNEL: | |
3066 | /* Can't register a consumer if there is already one */ | |
3067 | if (session->kernel_session->consumer_fd != 0) { | |
3068 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
3069 | goto error; | |
3070 | } | |
3071 | ||
3072 | sock = lttcomm_connect_unix_sock(sock_path); | |
3073 | if (sock < 0) { | |
3074 | ret = LTTCOMM_CONNECT_FAIL; | |
3075 | goto error; | |
3076 | } | |
3077 | ||
3078 | session->kernel_session->consumer_fd = sock; | |
3079 | break; | |
3080 | default: | |
3081 | /* TODO: Userspace tracing */ | |
3082 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3083 | goto error; | |
3084 | } | |
3085 | ||
3086 | ret = LTTCOMM_OK; | |
3087 | ||
3088 | error: | |
3089 | return ret; | |
3090 | } | |
3091 | ||
3092 | /* | |
3093 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3094 | */ | |
3095 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3096 | struct lttng_domain **domains) | |
3097 | { | |
b551a063 | 3098 | int ret, index = 0; |
54d01ffb DG |
3099 | ssize_t nb_dom = 0; |
3100 | ||
3101 | if (session->kernel_session != NULL) { | |
b551a063 | 3102 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3103 | nb_dom++; |
3104 | } | |
3105 | ||
b551a063 DG |
3106 | if (session->ust_session != NULL) { |
3107 | DBG3("Listing domains found UST global domain"); | |
3108 | nb_dom++; | |
3109 | } | |
54d01ffb | 3110 | |
b551a063 | 3111 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3112 | if (*domains == NULL) { |
3113 | ret = -LTTCOMM_FATAL; | |
3114 | goto error; | |
3115 | } | |
3116 | ||
b551a063 DG |
3117 | if (session->kernel_session != NULL) { |
3118 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3119 | index++; | |
3120 | } | |
3121 | ||
3122 | if (session->ust_session != NULL) { | |
3123 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3124 | index++; | |
3125 | } | |
54d01ffb | 3126 | |
54d01ffb DG |
3127 | return nb_dom; |
3128 | ||
3129 | error: | |
3130 | return ret; | |
3131 | } | |
3132 | ||
3133 | /* | |
3134 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3135 | */ | |
b551a063 | 3136 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3137 | struct lttng_channel **channels) |
3138 | { | |
3139 | int ret; | |
3140 | ssize_t nb_chan = 0; | |
3141 | ||
b551a063 DG |
3142 | switch (domain) { |
3143 | case LTTNG_DOMAIN_KERNEL: | |
3144 | if (session->kernel_session != NULL) { | |
3145 | nb_chan = session->kernel_session->channel_count; | |
3146 | } | |
0df502fd | 3147 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3148 | break; |
3149 | case LTTNG_DOMAIN_UST: | |
3150 | if (session->ust_session != NULL) { | |
3151 | nb_chan = hashtable_get_count( | |
3152 | session->ust_session->domain_global.channels); | |
3153 | } | |
0df502fd | 3154 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3155 | break; |
3156 | default: | |
3157 | *channels = NULL; | |
3158 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3159 | goto error; |
3160 | } | |
3161 | ||
b551a063 DG |
3162 | if (nb_chan > 0) { |
3163 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3164 | if (*channels == NULL) { | |
3165 | ret = -LTTCOMM_FATAL; | |
3166 | goto error; | |
3167 | } | |
54d01ffb | 3168 | |
b551a063 DG |
3169 | list_lttng_channels(domain, session, *channels); |
3170 | } else { | |
3171 | *channels = NULL; | |
3172 | } | |
2bdd86d4 | 3173 | |
54d01ffb DG |
3174 | return nb_chan; |
3175 | ||
3176 | error: | |
3177 | return ret; | |
3178 | } | |
3179 | ||
3180 | /* | |
3181 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3182 | */ | |
b551a063 | 3183 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3184 | char *channel_name, struct lttng_event **events) |
3185 | { | |
b551a063 | 3186 | int ret = 0; |
54d01ffb | 3187 | ssize_t nb_event = 0; |
54d01ffb | 3188 | |
b551a063 DG |
3189 | switch (domain) { |
3190 | case LTTNG_DOMAIN_KERNEL: | |
3191 | if (session->kernel_session != NULL) { | |
3192 | nb_event = list_lttng_kernel_events(channel_name, | |
3193 | session->kernel_session, events); | |
54d01ffb | 3194 | } |
b551a063 DG |
3195 | break; |
3196 | case LTTNG_DOMAIN_UST: | |
3197 | { | |
3198 | if (session->ust_session != NULL) { | |
3199 | nb_event = list_lttng_ust_global_events(channel_name, | |
3200 | &session->ust_session->domain_global, events); | |
54d01ffb | 3201 | } |
b551a063 | 3202 | break; |
54d01ffb | 3203 | } |
b551a063 DG |
3204 | default: |
3205 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3206 | goto error; |
3207 | } | |
3208 | ||
b551a063 | 3209 | ret = nb_event; |
54d01ffb DG |
3210 | |
3211 | error: | |
3212 | return ret; | |
3213 | } | |
3214 | ||
3215 | /* | |
3216 | * Process the command requested by the lttng client within the command | |
3217 | * context structure. This function make sure that the return structure (llm) | |
3218 | * is set and ready for transmission before returning. | |
3219 | * | |
3220 | * Return any error encountered or 0 for success. | |
3221 | */ | |
3222 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3223 | { | |
3224 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3225 | int need_tracing_session = 1; |
54d01ffb DG |
3226 | |
3227 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3228 | ||
3229 | /* | |
3230 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3231 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3232 | * command. |
3233 | */ | |
3234 | switch(cmd_ctx->lsm->cmd_type) { | |
3235 | case LTTNG_LIST_SESSIONS: | |
3236 | case LTTNG_LIST_TRACEPOINTS: | |
3237 | case LTTNG_LIST_DOMAINS: | |
3238 | case LTTNG_LIST_CHANNELS: | |
3239 | case LTTNG_LIST_EVENTS: | |
3240 | break; | |
3241 | default: | |
3242 | /* Setup lttng message with no payload */ | |
3243 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3244 | if (ret < 0) { | |
3245 | /* This label does not try to unlock the session */ | |
3246 | goto init_setup_error; | |
3247 | } | |
3248 | } | |
3249 | ||
3250 | /* Commands that DO NOT need a session. */ | |
3251 | switch (cmd_ctx->lsm->cmd_type) { | |
3252 | case LTTNG_CALIBRATE: | |
3253 | case LTTNG_CREATE_SESSION: | |
3254 | case LTTNG_LIST_SESSIONS: | |
3255 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3256 | need_tracing_session = 0; |
54d01ffb DG |
3257 | break; |
3258 | default: | |
3259 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3260 | session_lock_list(); |
54d01ffb | 3261 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3262 | session_unlock_list(); |
54d01ffb DG |
3263 | if (cmd_ctx->session == NULL) { |
3264 | if (cmd_ctx->lsm->session.name != NULL) { | |
3265 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3266 | } else { | |
3267 | /* If no session name specified */ | |
3268 | ret = LTTCOMM_SELECT_SESS; | |
3269 | } | |
3270 | goto error; | |
3271 | } else { | |
3272 | /* Acquire lock for the session */ | |
3273 | session_lock(cmd_ctx->session); | |
3274 | } | |
3275 | break; | |
3276 | } | |
b389abbe | 3277 | |
54d01ffb DG |
3278 | /* |
3279 | * Check domain type for specific "pre-action". | |
3280 | */ | |
3281 | switch (cmd_ctx->lsm->domain.type) { | |
3282 | case LTTNG_DOMAIN_KERNEL: | |
3283 | /* Kernel tracer check */ | |
3284 | if (kernel_tracer_fd == 0) { | |
3285 | /* Basically, load kernel tracer modules */ | |
3286 | init_kernel_tracer(); | |
3287 | if (kernel_tracer_fd == 0) { | |
3288 | ret = LTTCOMM_KERN_NA; | |
3289 | goto error; | |
3290 | } | |
3291 | } | |
5eb91c98 | 3292 | |
54d01ffb | 3293 | /* Need a session for kernel command */ |
44d3bd01 | 3294 | if (need_tracing_session) { |
54d01ffb DG |
3295 | if (cmd_ctx->session->kernel_session == NULL) { |
3296 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3297 | if (ret < 0) { |
54d01ffb | 3298 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3299 | goto error; |
3300 | } | |
b389abbe | 3301 | } |
7d29a247 | 3302 | |
54d01ffb | 3303 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3304 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3305 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3306 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3307 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3308 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3309 | if (ret < 0) { |
54d01ffb DG |
3310 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3311 | goto error; | |
950131af | 3312 | } |
3ff2ecac MD |
3313 | } else { |
3314 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3315 | } |
0d0c377a | 3316 | } |
54d01ffb | 3317 | break; |
2bdd86d4 | 3318 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3319 | { |
44d3bd01 | 3320 | if (need_tracing_session) { |
f6a9efaa | 3321 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3322 | ret = create_ust_session(cmd_ctx->session, |
3323 | &cmd_ctx->lsm->domain); | |
3324 | if (ret != LTTCOMM_OK) { | |
3325 | goto error; | |
3326 | } | |
3327 | } | |
7753dea8 MD |
3328 | /* Start the UST consumer daemons */ |
3329 | /* 64-bit */ | |
3330 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
ebaeda94 | 3331 | if (consumerd64_path[0] != '\0' && |
7753dea8 | 3332 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3333 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3334 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3335 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3336 | if (ret < 0) { |
7753dea8 MD |
3337 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3338 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3339 | goto error; |
3340 | } | |
48842b30 | 3341 | |
7753dea8 | 3342 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3343 | } else { |
7753dea8 MD |
3344 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3345 | } | |
3346 | /* 32-bit */ | |
ebaeda94 | 3347 | if (consumerd32_path[0] != '\0' && |
7753dea8 MD |
3348 | ustconsumer32_data.pid == 0 && |
3349 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3350 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3351 | ret = start_consumerd(&ustconsumer32_data); | |
3352 | if (ret < 0) { | |
3353 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3354 | ust_consumerd32_fd = -EINVAL; | |
3355 | goto error; | |
3356 | } | |
3357 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3358 | } else { | |
3359 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3360 | } |
44d3bd01 DG |
3361 | } |
3362 | break; | |
3363 | } | |
54d01ffb | 3364 | default: |
54d01ffb DG |
3365 | break; |
3366 | } | |
33a2b854 | 3367 | |
54d01ffb DG |
3368 | /* Process by command type */ |
3369 | switch (cmd_ctx->lsm->cmd_type) { | |
3370 | case LTTNG_ADD_CONTEXT: | |
3371 | { | |
3372 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3373 | cmd_ctx->lsm->u.context.channel_name, | |
3374 | cmd_ctx->lsm->u.context.event_name, | |
3375 | &cmd_ctx->lsm->u.context.ctx); | |
3376 | break; | |
3377 | } | |
3378 | case LTTNG_DISABLE_CHANNEL: | |
3379 | { | |
3380 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3381 | cmd_ctx->lsm->u.disable.channel_name); | |
3382 | break; | |
3383 | } | |
3384 | case LTTNG_DISABLE_EVENT: | |
3385 | { | |
3386 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3387 | cmd_ctx->lsm->u.disable.channel_name, | |
3388 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3389 | ret = LTTCOMM_OK; |
3390 | break; | |
3391 | } | |
54d01ffb DG |
3392 | case LTTNG_DISABLE_ALL_EVENT: |
3393 | { | |
2bdd86d4 | 3394 | DBG("Disabling all events"); |
54d01ffb DG |
3395 | |
3396 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3397 | cmd_ctx->lsm->u.disable.channel_name); | |
3398 | break; | |
3399 | } | |
3400 | case LTTNG_ENABLE_CHANNEL: | |
3401 | { | |
aea829b3 | 3402 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3403 | &cmd_ctx->lsm->u.channel.chan); |
3404 | break; | |
3405 | } | |
3406 | case LTTNG_ENABLE_EVENT: | |
3407 | { | |
3408 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3409 | cmd_ctx->lsm->u.enable.channel_name, | |
3410 | &cmd_ctx->lsm->u.enable.event); | |
3411 | break; | |
3412 | } | |
3413 | case LTTNG_ENABLE_ALL_EVENT: | |
3414 | { | |
2bdd86d4 | 3415 | DBG("Enabling all events"); |
54d01ffb DG |
3416 | |
3417 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3418 | cmd_ctx->lsm->u.enable.channel_name, |
3419 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3420 | break; |
3421 | } | |
052da939 | 3422 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3423 | { |
9f19cc17 | 3424 | struct lttng_event *events; |
54d01ffb | 3425 | ssize_t nb_events; |
052da939 | 3426 | |
54d01ffb DG |
3427 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3428 | if (nb_events < 0) { | |
3429 | ret = -nb_events; | |
3430 | goto error; | |
2ef84c95 DG |
3431 | } |
3432 | ||
3433 | /* | |
3434 | * Setup lttng message with payload size set to the event list size in | |
3435 | * bytes and then copy list into the llm payload. | |
3436 | */ | |
052da939 | 3437 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3438 | if (ret < 0) { |
052da939 | 3439 | free(events); |
2ef84c95 DG |
3440 | goto setup_error; |
3441 | } | |
3442 | ||
3443 | /* Copy event list into message payload */ | |
9f19cc17 | 3444 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3445 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3446 | |
9f19cc17 | 3447 | free(events); |
2ef84c95 DG |
3448 | |
3449 | ret = LTTCOMM_OK; | |
3450 | break; | |
3451 | } | |
f3ed775e | 3452 | case LTTNG_START_TRACE: |
8c0faa1d | 3453 | { |
54d01ffb | 3454 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3455 | break; |
3456 | } | |
f3ed775e | 3457 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3458 | { |
54d01ffb | 3459 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3460 | break; |
3461 | } | |
5e16da05 MD |
3462 | case LTTNG_CREATE_SESSION: |
3463 | { | |
3c6bae61 | 3464 | tracepoint(create_session_start); |
54d01ffb DG |
3465 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3466 | cmd_ctx->lsm->session.path); | |
3c6bae61 | 3467 | tracepoint(create_session_end); |
5e16da05 MD |
3468 | break; |
3469 | } | |
3470 | case LTTNG_DESTROY_SESSION: | |
3471 | { | |
3c6bae61 | 3472 | tracepoint(destroy_session_start); |
54d01ffb DG |
3473 | ret = cmd_destroy_session(cmd_ctx->session, |
3474 | cmd_ctx->lsm->session.name); | |
3c6bae61 | 3475 | tracepoint(destroy_session_end); |
5461b305 | 3476 | break; |
5e16da05 | 3477 | } |
9f19cc17 | 3478 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3479 | { |
54d01ffb DG |
3480 | ssize_t nb_dom; |
3481 | struct lttng_domain *domains; | |
5461b305 | 3482 | |
54d01ffb DG |
3483 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3484 | if (nb_dom < 0) { | |
3485 | ret = -nb_dom; | |
3486 | goto error; | |
ce3d728c | 3487 | } |
520ff687 | 3488 | |
54d01ffb | 3489 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3490 | if (ret < 0) { |
3491 | goto setup_error; | |
520ff687 | 3492 | } |
57167058 | 3493 | |
54d01ffb DG |
3494 | /* Copy event list into message payload */ |
3495 | memcpy(cmd_ctx->llm->payload, domains, | |
3496 | nb_dom * sizeof(struct lttng_domain)); | |
3497 | ||
3498 | free(domains); | |
5e16da05 | 3499 | |
5461b305 | 3500 | ret = LTTCOMM_OK; |
5e16da05 MD |
3501 | break; |
3502 | } | |
9f19cc17 | 3503 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3504 | { |
54d01ffb DG |
3505 | size_t nb_chan; |
3506 | struct lttng_channel *channels; | |
3507 | ||
b551a063 DG |
3508 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3509 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3510 | if (nb_chan < 0) { |
3511 | ret = -nb_chan; | |
3512 | goto error; | |
5461b305 | 3513 | } |
ca95a216 | 3514 | |
54d01ffb | 3515 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3516 | if (ret < 0) { |
3517 | goto setup_error; | |
3518 | } | |
9f19cc17 | 3519 | |
54d01ffb DG |
3520 | /* Copy event list into message payload */ |
3521 | memcpy(cmd_ctx->llm->payload, channels, | |
3522 | nb_chan * sizeof(struct lttng_channel)); | |
3523 | ||
3524 | free(channels); | |
9f19cc17 DG |
3525 | |
3526 | ret = LTTCOMM_OK; | |
5461b305 | 3527 | break; |
5e16da05 | 3528 | } |
9f19cc17 | 3529 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3530 | { |
b551a063 | 3531 | ssize_t nb_event; |
684d34d2 | 3532 | struct lttng_event *events = NULL; |
9f19cc17 | 3533 | |
b551a063 | 3534 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3535 | cmd_ctx->lsm->u.list.channel_name, &events); |
3536 | if (nb_event < 0) { | |
3537 | ret = -nb_event; | |
3538 | goto error; | |
5461b305 | 3539 | } |
ca95a216 | 3540 | |
54d01ffb | 3541 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3542 | if (ret < 0) { |
3543 | goto setup_error; | |
3544 | } | |
9f19cc17 | 3545 | |
54d01ffb DG |
3546 | /* Copy event list into message payload */ |
3547 | memcpy(cmd_ctx->llm->payload, events, | |
3548 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3549 | |
54d01ffb | 3550 | free(events); |
9f19cc17 DG |
3551 | |
3552 | ret = LTTCOMM_OK; | |
5461b305 | 3553 | break; |
5e16da05 MD |
3554 | } |
3555 | case LTTNG_LIST_SESSIONS: | |
3556 | { | |
54d01ffb | 3557 | session_lock_list(); |
5461b305 | 3558 | |
6c9cc2ab | 3559 | if (session_list_ptr->count == 0) { |
f3ed775e | 3560 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3561 | session_unlock_list(); |
5461b305 | 3562 | goto error; |
57167058 | 3563 | } |
5e16da05 | 3564 | |
6c9cc2ab DG |
3565 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3566 | session_list_ptr->count); | |
5461b305 | 3567 | if (ret < 0) { |
54d01ffb | 3568 | session_unlock_list(); |
5461b305 | 3569 | goto setup_error; |
e065084a | 3570 | } |
5e16da05 | 3571 | |
6c9cc2ab DG |
3572 | /* Filled the session array */ |
3573 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3574 | ||
54d01ffb | 3575 | session_unlock_list(); |
5e16da05 | 3576 | |
5461b305 | 3577 | ret = LTTCOMM_OK; |
5e16da05 MD |
3578 | break; |
3579 | } | |
d0254c7c MD |
3580 | case LTTNG_CALIBRATE: |
3581 | { | |
54d01ffb DG |
3582 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3583 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3584 | break; |
3585 | } | |
d9800920 DG |
3586 | case LTTNG_REGISTER_CONSUMER: |
3587 | { | |
54d01ffb DG |
3588 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3589 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3590 | break; |
3591 | } | |
5e16da05 | 3592 | default: |
5e16da05 | 3593 | ret = LTTCOMM_UND; |
5461b305 | 3594 | break; |
fac6795d DG |
3595 | } |
3596 | ||
5461b305 | 3597 | error: |
5461b305 DG |
3598 | if (cmd_ctx->llm == NULL) { |
3599 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3600 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3601 | goto setup_error; |
3602 | } | |
3603 | } | |
54d01ffb | 3604 | /* Set return code */ |
5461b305 | 3605 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3606 | setup_error: |
b5541356 | 3607 | if (cmd_ctx->session) { |
54d01ffb | 3608 | session_unlock(cmd_ctx->session); |
b5541356 | 3609 | } |
54d01ffb | 3610 | init_setup_error: |
8028d920 | 3611 | return ret; |
fac6795d DG |
3612 | } |
3613 | ||
1d4b027a | 3614 | /* |
d063d709 DG |
3615 | * This thread manage all clients request using the unix client socket for |
3616 | * communication. | |
1d4b027a DG |
3617 | */ |
3618 | static void *thread_manage_clients(void *data) | |
3619 | { | |
5eb91c98 DG |
3620 | int sock = 0, ret, i, pollfd; |
3621 | uint32_t revents, nb_fd; | |
273ea72c | 3622 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3623 | struct lttng_poll_event events; |
1d4b027a | 3624 | |
b25a8868 DG |
3625 | tracepoint(sessiond_th_cli_start); |
3626 | ||
1d4b027a DG |
3627 | DBG("[thread] Manage client started"); |
3628 | ||
f6a9efaa DG |
3629 | rcu_register_thread(); |
3630 | ||
1d4b027a DG |
3631 | ret = lttcomm_listen_unix_sock(client_sock); |
3632 | if (ret < 0) { | |
3633 | goto error; | |
3634 | } | |
3635 | ||
5eb91c98 DG |
3636 | /* |
3637 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3638 | * more will be added to this poll set. | |
3639 | */ | |
3640 | ret = create_thread_poll_set(&events, 2); | |
3641 | if (ret < 0) { | |
3642 | goto error; | |
3643 | } | |
273ea72c | 3644 | |
5eb91c98 DG |
3645 | /* Add the application registration socket */ |
3646 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3647 | if (ret < 0) { | |
3648 | goto error; | |
3649 | } | |
273ea72c | 3650 | |
bbd973c2 DG |
3651 | /* |
3652 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3653 | */ |
3654 | if (opt_sig_parent) { | |
3655 | kill(ppid, SIGCHLD); | |
3656 | } | |
3657 | ||
3658 | while (1) { | |
1d4b027a | 3659 | DBG("Accepting client command ..."); |
273ea72c | 3660 | |
b25a8868 DG |
3661 | tracepoint(sessiond_th_cli_poll); |
3662 | ||
5eb91c98 DG |
3663 | nb_fd = LTTNG_POLL_GETNB(&events); |
3664 | ||
273ea72c | 3665 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3666 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3667 | if (ret < 0) { |
273ea72c DG |
3668 | goto error; |
3669 | } | |
3670 | ||
5eb91c98 DG |
3671 | for (i = 0; i < nb_fd; i++) { |
3672 | /* Fetch once the poll data */ | |
3673 | revents = LTTNG_POLL_GETEV(&events, i); | |
3674 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3675 | ||
3676 | /* Thread quit pipe has been closed. Killing thread. */ | |
3677 | ret = check_thread_quit_pipe(pollfd, revents); | |
3678 | if (ret) { | |
3679 | goto error; | |
3680 | } | |
3681 | ||
3682 | /* Event on the registration socket */ | |
3683 | if (pollfd == client_sock) { | |
3684 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3685 | ERR("Client socket poll error"); | |
3686 | goto error; | |
3687 | } | |
3688 | } | |
273ea72c DG |
3689 | } |
3690 | ||
5eb91c98 DG |
3691 | DBG("Wait for client response"); |
3692 | ||
1d4b027a DG |
3693 | sock = lttcomm_accept_unix_sock(client_sock); |
3694 | if (sock < 0) { | |
3695 | goto error; | |
3696 | } | |
3697 | ||
3698 | /* Allocate context command to process the client request */ | |
ba7f0ae5 | 3699 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3700 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3701 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3702 | goto error; |
5eb91c98 | 3703 | } |
1d4b027a DG |
3704 | |
3705 | /* Allocate data buffer for reception */ | |
ba7f0ae5 | 3706 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3707 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3708 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3709 | goto error; |
3710 | } | |
1d4b027a | 3711 | |
1d4b027a DG |
3712 | cmd_ctx->llm = NULL; |
3713 | cmd_ctx->session = NULL; | |
3714 | ||
3715 | /* | |
3716 | * Data is received from the lttng client. The struct | |
3717 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3718 | * the client. | |
3719 | */ | |
3720 | DBG("Receiving data from client ..."); | |
5eb91c98 DG |
3721 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
3722 | sizeof(struct lttcomm_session_msg)); | |
1d4b027a | 3723 | if (ret <= 0) { |
5eb91c98 DG |
3724 | DBG("Nothing recv() from client... continuing"); |
3725 | close(sock); | |
3726 | free(cmd_ctx); | |
1d4b027a DG |
3727 | continue; |
3728 | } | |
3729 | ||
5eb91c98 DG |
3730 | // TODO: Validate cmd_ctx including sanity check for |
3731 | // security purpose. | |
f7776ea7 | 3732 | |
f6a9efaa | 3733 | rcu_thread_online(); |
1d4b027a DG |
3734 | /* |
3735 | * This function dispatch the work to the kernel or userspace tracer | |
3736 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3737 | * informations for the client. The command context struct contains | |
3738 | * everything this function may needs. | |
3739 | */ | |
3740 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3741 | rcu_thread_offline(); |
1d4b027a | 3742 | if (ret < 0) { |
bbd973c2 | 3743 | /* |
5eb91c98 | 3744 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3745 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3746 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3747 | */ |
a2fb29a5 | 3748 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
3749 | continue; |
3750 | } | |
3751 | ||
54d01ffb DG |
3752 | DBG("Sending response (size: %d, retcode: %s)", |
3753 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3754 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3755 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
1d4b027a DG |
3756 | if (ret < 0) { |
3757 | ERR("Failed to send data back to client"); | |
3758 | } | |
3759 | ||
a2fb29a5 | 3760 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
3761 | |
3762 | /* End of transmission */ | |
3763 | close(sock); | |
1d4b027a DG |
3764 | } |
3765 | ||
3766 | error: | |
273ea72c | 3767 | DBG("Client thread dying"); |
273ea72c | 3768 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3769 | close(client_sock); |
3770 | close(sock); | |
273ea72c | 3771 | |
5eb91c98 | 3772 | lttng_poll_clean(&events); |
a2fb29a5 | 3773 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3774 | |
3775 | rcu_unregister_thread(); | |
1d4b027a DG |
3776 | return NULL; |
3777 | } | |
3778 | ||
3779 | ||
fac6795d DG |
3780 | /* |
3781 | * usage function on stderr | |
3782 | */ | |
3783 | static void usage(void) | |
3784 | { | |
b716ce68 | 3785 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3786 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3787 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3788 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3789 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3790 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3791 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3792 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3793 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3794 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3795 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3796 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3797 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3798 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3799 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3800 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3801 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3802 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3803 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3804 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3805 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3806 | } |
3807 | ||
3808 | /* | |
3809 | * daemon argument parsing | |
3810 | */ | |
3811 | static int parse_args(int argc, char **argv) | |
3812 | { | |
3813 | int c; | |
3814 | ||
3815 | static struct option long_options[] = { | |
3816 | { "client-sock", 1, 0, 'c' }, | |
3817 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3818 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3819 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3820 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3821 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3822 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3823 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3824 | { "consumerd32-path", 1, 0, 'u' }, | |
3825 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3826 | { "consumerd64-path", 1, 0, 't' }, | |
3827 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3828 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3829 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3830 | { "help", 0, 0, 'h' }, |
3831 | { "group", 1, 0, 'g' }, | |
3832 | { "version", 0, 0, 'V' }, | |
75462a81 | 3833 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3834 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3835 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3836 | { NULL, 0, 0, 0 } |
3837 | }; | |
3838 | ||
3839 | while (1) { | |
3840 | int option_index = 0; | |
7753dea8 | 3841 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3842 | long_options, &option_index); |
fac6795d DG |
3843 | if (c == -1) { |
3844 | break; | |
3845 | } | |
3846 | ||
3847 | switch (c) { | |
3848 | case 0: | |
3849 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3850 | if (optarg) { | |
3851 | fprintf(stderr, " with arg %s\n", optarg); | |
3852 | } | |
3853 | break; | |
b716ce68 | 3854 | case 'c': |
fac6795d DG |
3855 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3856 | break; | |
3857 | case 'a': | |
3858 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3859 | break; | |
3860 | case 'd': | |
3861 | opt_daemon = 1; | |
3862 | break; | |
3863 | case 'g': | |
fb09408a | 3864 | opt_tracing_group = optarg; |
fac6795d DG |
3865 | break; |
3866 | case 'h': | |
3867 | usage(); | |
3868 | exit(EXIT_FAILURE); | |
3869 | case 'V': | |
3870 | fprintf(stdout, "%s\n", VERSION); | |
3871 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3872 | case 'S': |
3873 | opt_sig_parent = 1; | |
3874 | break; | |
d6f42150 | 3875 | case 'E': |
3bd1e081 | 3876 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3877 | break; |
3878 | case 'C': | |
3bd1e081 MD |
3879 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3880 | break; | |
3881 | case 'F': | |
7753dea8 | 3882 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3883 | break; |
3884 | case 'D': | |
7753dea8 MD |
3885 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3886 | break; | |
3887 | case 'H': | |
3888 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3889 | break; | |
3890 | case 'G': | |
3891 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3892 | break; |
75462a81 DG |
3893 | case 'q': |
3894 | opt_quiet = 1; | |
3895 | break; | |
3f9947db | 3896 | case 'v': |
53086306 DG |
3897 | /* Verbose level can increase using multiple -v */ |
3898 | opt_verbose += 1; | |
3f9947db | 3899 | break; |
31f73cc9 | 3900 | case 'Z': |
3bd1e081 | 3901 | opt_verbose_consumer += 1; |
31f73cc9 | 3902 | break; |
fb09408a | 3903 | case 'u': |
ebaeda94 MD |
3904 | consumerd32_path= optarg; |
3905 | break; | |
3906 | case 'U': | |
3907 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3908 | break; |
3909 | case 't': | |
ebaeda94 MD |
3910 | consumerd64_path = optarg; |
3911 | break; | |
3912 | case 'T': | |
3913 | consumerd64_libdir = optarg; | |
fb09408a | 3914 | break; |
fac6795d DG |
3915 | default: |
3916 | /* Unknown option or other error. | |
3917 | * Error is printed by getopt, just return */ | |
3918 | return -1; | |
3919 | } | |
3920 | } | |
3921 | ||
3922 | return 0; | |
3923 | } | |
3924 | ||
3925 | /* | |
d063d709 | 3926 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3927 | * apps_sock - The communication socket for all UST apps. |
3928 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3929 | */ |
cf3af59e | 3930 | static int init_daemon_socket(void) |
fac6795d DG |
3931 | { |
3932 | int ret = 0; | |
3933 | mode_t old_umask; | |
3934 | ||
3935 | old_umask = umask(0); | |
3936 | ||
3937 | /* Create client tool unix socket */ | |
d6f42150 DG |
3938 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3939 | if (client_sock < 0) { | |
3940 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3941 | ret = -1; |
3942 | goto end; | |
3943 | } | |
3944 | ||
3945 | /* File permission MUST be 660 */ | |
3946 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3947 | if (ret < 0) { | |
d6f42150 | 3948 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3949 | perror("chmod"); |
3950 | goto end; | |
3951 | } | |
3952 | ||
3953 | /* Create the application unix socket */ | |
d6f42150 DG |
3954 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3955 | if (apps_sock < 0) { | |
3956 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3957 | ret = -1; |
3958 | goto end; | |
3959 | } | |
3960 | ||
d6f42150 | 3961 | /* File permission MUST be 666 */ |
54d01ffb DG |
3962 | ret = chmod(apps_unix_sock_path, |
3963 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3964 | if (ret < 0) { |
d6f42150 | 3965 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3966 | perror("chmod"); |
3967 | goto end; | |
3968 | } | |
3969 | ||
3970 | end: | |
3971 | umask(old_umask); | |
3972 | return ret; | |
3973 | } | |
3974 | ||
3975 | /* | |
54d01ffb DG |
3976 | * Check if the global socket is available, and if a daemon is answering at the |
3977 | * other side. If yes, error is returned. | |
fac6795d | 3978 | */ |
cf3af59e | 3979 | static int check_existing_daemon(void) |
fac6795d | 3980 | { |
7d8234d9 | 3981 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3982 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3983 | return 0; |
099e26bd | 3984 | } |
54d01ffb | 3985 | |
7d8234d9 | 3986 | /* Is there anybody out there ? */ |
099e26bd | 3987 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3988 | return -EEXIST; |
099e26bd | 3989 | } else { |
7d8234d9 | 3990 | return 0; |
099e26bd | 3991 | } |
fac6795d DG |
3992 | } |
3993 | ||
fac6795d | 3994 | /* |
d063d709 | 3995 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3996 | * |
d063d709 DG |
3997 | * Race window between mkdir and chown is OK because we are going from more |
3998 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3999 | */ |
d6f42150 | 4000 | static int set_permissions(void) |
fac6795d DG |
4001 | { |
4002 | int ret; | |
996b65c8 | 4003 | gid_t gid; |
fac6795d | 4004 | |
996b65c8 MD |
4005 | gid = allowed_group(); |
4006 | if (gid < 0) { | |
a463f419 DG |
4007 | if (is_root) { |
4008 | WARN("No tracing group detected"); | |
4009 | ret = 0; | |
4010 | } else { | |
4011 | ERR("Missing tracing group. Aborting execution."); | |
4012 | ret = -1; | |
4013 | } | |
fac6795d DG |
4014 | goto end; |
4015 | } | |
4016 | ||
d6f42150 | 4017 | /* Set lttng run dir */ |
996b65c8 | 4018 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
4019 | if (ret < 0) { |
4020 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
4021 | perror("chown"); | |
4022 | } | |
4023 | ||
4024 | /* lttng client socket path */ | |
996b65c8 | 4025 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4026 | if (ret < 0) { |
d6f42150 DG |
4027 | ERR("Unable to set group on %s", client_unix_sock_path); |
4028 | perror("chown"); | |
4029 | } | |
4030 | ||
3bd1e081 MD |
4031 | /* kconsumer error socket path */ |
4032 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4033 | if (ret < 0) { |
3bd1e081 MD |
4034 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4035 | perror("chown"); | |
4036 | } | |
4037 | ||
7753dea8 MD |
4038 | /* 64-bit ustconsumer error socket path */ |
4039 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4040 | if (ret < 0) { | |
4041 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4042 | perror("chown"); | |
4043 | } | |
4044 | ||
4045 | /* 32-bit ustconsumer compat32 error socket path */ | |
4046 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4047 | if (ret < 0) { |
7753dea8 | 4048 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4049 | perror("chown"); |
4050 | } | |
4051 | ||
d6f42150 | 4052 | DBG("All permissions are set"); |
e07ae692 | 4053 | |
fac6795d DG |
4054 | end: |
4055 | return ret; | |
4056 | } | |
4057 | ||
7a485870 | 4058 | /* |
d063d709 | 4059 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4060 | */ |
4061 | static int create_kernel_poll_pipe(void) | |
4062 | { | |
4063 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4064 | } | |
4065 | ||
099e26bd DG |
4066 | /* |
4067 | * Create the application command pipe to wake thread_manage_apps. | |
4068 | */ | |
4069 | static int create_apps_cmd_pipe(void) | |
4070 | { | |
4071 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4072 | } | |
4073 | ||
d6f42150 | 4074 | /* |
d063d709 | 4075 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
4076 | */ |
4077 | static int create_lttng_rundir(void) | |
4078 | { | |
4079 | int ret; | |
4080 | ||
4081 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
4082 | if (ret < 0) { | |
b1f11e69 DG |
4083 | if (errno != EEXIST) { |
4084 | ERR("Unable to create " LTTNG_RUNDIR); | |
4085 | goto error; | |
4086 | } else { | |
4087 | ret = 0; | |
4088 | } | |
d6f42150 DG |
4089 | } |
4090 | ||
4091 | error: | |
4092 | return ret; | |
4093 | } | |
4094 | ||
4095 | /* | |
d063d709 DG |
4096 | * Setup sockets and directory needed by the kconsumerd communication with the |
4097 | * session daemon. | |
d6f42150 | 4098 | */ |
3bd1e081 | 4099 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
4100 | { |
4101 | int ret; | |
7753dea8 | 4102 | const char *path; |
d6f42150 | 4103 | |
7753dea8 MD |
4104 | switch (consumer_data->type) { |
4105 | case LTTNG_CONSUMER_KERNEL: | |
4106 | path = KCONSUMERD_PATH; | |
4107 | break; | |
4108 | case LTTNG_CONSUMER64_UST: | |
4109 | path = USTCONSUMERD64_PATH; | |
4110 | break; | |
4111 | case LTTNG_CONSUMER32_UST: | |
4112 | path = USTCONSUMERD32_PATH; | |
4113 | break; | |
4114 | default: | |
4115 | ERR("Consumer type unknown"); | |
4116 | ret = -EINVAL; | |
4117 | goto error; | |
d6f42150 DG |
4118 | } |
4119 | ||
3bd1e081 | 4120 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4121 | if (ret < 0) { |
6beb2242 | 4122 | if (errno != EEXIST) { |
3bd1e081 | 4123 | ERR("Failed to create %s", path); |
6beb2242 DG |
4124 | goto error; |
4125 | } | |
4126 | ret = 0; | |
d6f42150 DG |
4127 | } |
4128 | ||
4129 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4130 | consumer_data->err_sock = |
4131 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4132 | if (consumer_data->err_sock < 0) { | |
4133 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4134 | ret = -1; |
4135 | goto error; | |
4136 | } | |
4137 | ||
4138 | /* File permission MUST be 660 */ | |
3bd1e081 | 4139 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4140 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4141 | if (ret < 0) { |
3bd1e081 | 4142 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
4143 | perror("chmod"); |
4144 | goto error; | |
4145 | } | |
4146 | ||
4147 | error: | |
4148 | return ret; | |
4149 | } | |
4150 | ||
fac6795d | 4151 | /* |
d063d709 | 4152 | * Signal handler for the daemon |
cf3af59e | 4153 | * |
54d01ffb DG |
4154 | * Simply stop all worker threads, leaving main() return gracefully after |
4155 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4156 | */ |
4157 | static void sighandler(int sig) | |
4158 | { | |
4159 | switch (sig) { | |
cf3af59e MD |
4160 | case SIGPIPE: |
4161 | DBG("SIGPIPE catched"); | |
4162 | return; | |
4163 | case SIGINT: | |
4164 | DBG("SIGINT catched"); | |
4165 | stop_threads(); | |
4166 | break; | |
4167 | case SIGTERM: | |
4168 | DBG("SIGTERM catched"); | |
4169 | stop_threads(); | |
4170 | break; | |
4171 | default: | |
4172 | break; | |
fac6795d | 4173 | } |
fac6795d DG |
4174 | } |
4175 | ||
4176 | /* | |
d063d709 | 4177 | * Setup signal handler for : |
1d4b027a | 4178 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4179 | */ |
1d4b027a | 4180 | static int set_signal_handler(void) |
fac6795d | 4181 | { |
1d4b027a DG |
4182 | int ret = 0; |
4183 | struct sigaction sa; | |
4184 | sigset_t sigset; | |
fac6795d | 4185 | |
1d4b027a DG |
4186 | if ((ret = sigemptyset(&sigset)) < 0) { |
4187 | perror("sigemptyset"); | |
4188 | return ret; | |
4189 | } | |
d6f42150 | 4190 | |
1d4b027a DG |
4191 | sa.sa_handler = sighandler; |
4192 | sa.sa_mask = sigset; | |
4193 | sa.sa_flags = 0; | |
4194 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4195 | perror("sigaction"); | |
4196 | return ret; | |
d6f42150 DG |
4197 | } |
4198 | ||
1d4b027a DG |
4199 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4200 | perror("sigaction"); | |
4201 | return ret; | |
d6f42150 | 4202 | } |
aaf26714 | 4203 | |
1d4b027a DG |
4204 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4205 | perror("sigaction"); | |
4206 | return ret; | |
8c0faa1d DG |
4207 | } |
4208 | ||
1d4b027a DG |
4209 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4210 | ||
4211 | return ret; | |
fac6795d DG |
4212 | } |
4213 | ||
f3ed775e | 4214 | /* |
d063d709 DG |
4215 | * Set open files limit to unlimited. This daemon can open a large number of |
4216 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4217 | */ |
4218 | static void set_ulimit(void) | |
4219 | { | |
4220 | int ret; | |
4221 | struct rlimit lim; | |
4222 | ||
a88df331 | 4223 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4224 | lim.rlim_cur = 65535; |
4225 | lim.rlim_max = 65535; | |
4226 | ||
4227 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4228 | if (ret < 0) { | |
4229 | perror("failed to set open files limit"); | |
4230 | } | |
4231 | } | |
4232 | ||
fac6795d DG |
4233 | /* |
4234 | * main | |
4235 | */ | |
4236 | int main(int argc, char **argv) | |
4237 | { | |
fac6795d DG |
4238 | int ret = 0; |
4239 | void *status; | |
b082db07 | 4240 | const char *home_path; |
fac6795d | 4241 | |
b25a8868 | 4242 | tracepoint(sessiond_boot_start); |
f6a9efaa | 4243 | rcu_register_thread(); |
b25a8868 | 4244 | |
273ea72c | 4245 | /* Create thread quit pipe */ |
cf3af59e MD |
4246 | if ((ret = init_thread_quit_pipe()) < 0) { |
4247 | goto error; | |
273ea72c DG |
4248 | } |
4249 | ||
7753dea8 | 4250 | setup_consumerd_path(); |
fb09408a | 4251 | |
fac6795d DG |
4252 | /* Parse arguments */ |
4253 | progname = argv[0]; | |
4254 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4255 | goto error; |
fac6795d DG |
4256 | } |
4257 | ||
4258 | /* Daemonize */ | |
4259 | if (opt_daemon) { | |
53094c05 DG |
4260 | ret = daemon(0, 0); |
4261 | if (ret < 0) { | |
4262 | perror("daemon"); | |
cf3af59e | 4263 | goto error; |
53094c05 | 4264 | } |
fac6795d DG |
4265 | } |
4266 | ||
4267 | /* Check if daemon is UID = 0 */ | |
4268 | is_root = !getuid(); | |
4269 | ||
fac6795d | 4270 | if (is_root) { |
d6f42150 DG |
4271 | ret = create_lttng_rundir(); |
4272 | if (ret < 0) { | |
cf3af59e | 4273 | goto error; |
d6f42150 DG |
4274 | } |
4275 | ||
fac6795d | 4276 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4277 | snprintf(apps_unix_sock_path, PATH_MAX, |
4278 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4279 | } |
4280 | ||
4281 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4282 | snprintf(client_unix_sock_path, PATH_MAX, |
4283 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4284 | } | |
0fdd1e2c DG |
4285 | |
4286 | /* Set global SHM for ust */ | |
4287 | if (strlen(wait_shm_path) == 0) { | |
4288 | snprintf(wait_shm_path, PATH_MAX, | |
4289 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4290 | } | |
fac6795d | 4291 | } else { |
b082db07 DG |
4292 | home_path = get_home_dir(); |
4293 | if (home_path == NULL) { | |
273ea72c DG |
4294 | /* TODO: Add --socket PATH option */ |
4295 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4296 | ret = -EPERM; |
4297 | goto error; | |
b082db07 DG |
4298 | } |
4299 | ||
fac6795d | 4300 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4301 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4302 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4303 | } |
4304 | ||
4305 | /* Set the cli tool unix socket path */ | |
4306 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4307 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4308 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4309 | } |
0fdd1e2c DG |
4310 | |
4311 | /* Set global SHM for ust */ | |
4312 | if (strlen(wait_shm_path) == 0) { | |
4313 | snprintf(wait_shm_path, PATH_MAX, | |
4314 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4315 | } | |
fac6795d DG |
4316 | } |
4317 | ||
847177cd DG |
4318 | DBG("Client socket path %s", client_unix_sock_path); |
4319 | DBG("Application socket path %s", apps_unix_sock_path); | |
4320 | ||
273ea72c | 4321 | /* |
7d8234d9 | 4322 | * See if daemon already exist. |
fac6795d | 4323 | */ |
7d8234d9 | 4324 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4325 | ERR("Already running daemon.\n"); |
273ea72c | 4326 | /* |
cf3af59e MD |
4327 | * We do not goto exit because we must not cleanup() |
4328 | * because a daemon is already running. | |
ab118b20 | 4329 | */ |
cf3af59e | 4330 | goto error; |
a88df331 DG |
4331 | } |
4332 | ||
54d01ffb | 4333 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4334 | |
4335 | /* | |
4336 | * These actions must be executed as root. We do that *after* setting up | |
4337 | * the sockets path because we MUST make the check for another daemon using | |
4338 | * those paths *before* trying to set the kernel consumer sockets and init | |
4339 | * kernel tracer. | |
4340 | */ | |
4341 | if (is_root) { | |
3bd1e081 | 4342 | ret = set_consumer_sockets(&kconsumer_data); |
a88df331 | 4343 | if (ret < 0) { |
cf3af59e | 4344 | goto exit; |
a88df331 DG |
4345 | } |
4346 | ||
7753dea8 | 4347 | ret = set_consumer_sockets(&ustconsumer64_data); |
a88df331 | 4348 | if (ret < 0) { |
cf3af59e | 4349 | goto exit; |
a88df331 | 4350 | } |
7753dea8 MD |
4351 | |
4352 | ret = set_consumer_sockets(&ustconsumer32_data); | |
4353 | if (ret < 0) { | |
4354 | goto exit; | |
4355 | } | |
4356 | ||
a88df331 DG |
4357 | /* Setup kernel tracer */ |
4358 | init_kernel_tracer(); | |
4359 | ||
4360 | /* Set ulimit for open files */ | |
4361 | set_ulimit(); | |
fac6795d DG |
4362 | } |
4363 | ||
cf3af59e MD |
4364 | if ((ret = set_signal_handler()) < 0) { |
4365 | goto exit; | |
fac6795d DG |
4366 | } |
4367 | ||
d6f42150 | 4368 | /* Setup the needed unix socket */ |
cf3af59e MD |
4369 | if ((ret = init_daemon_socket()) < 0) { |
4370 | goto exit; | |
fac6795d DG |
4371 | } |
4372 | ||
4373 | /* Set credentials to socket */ | |
cf3af59e MD |
4374 | if (is_root && ((ret = set_permissions()) < 0)) { |
4375 | goto exit; | |
fac6795d DG |
4376 | } |
4377 | ||
5b8719f5 DG |
4378 | /* Get parent pid if -S, --sig-parent is specified. */ |
4379 | if (opt_sig_parent) { | |
4380 | ppid = getppid(); | |
4381 | } | |
4382 | ||
7a485870 | 4383 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4384 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4385 | goto exit; | |
7a485870 DG |
4386 | } |
4387 | ||
099e26bd DG |
4388 | /* Setup the thread apps communication pipe. */ |
4389 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4390 | goto exit; | |
4391 | } | |
4392 | ||
4393 | /* Init UST command queue. */ | |
4394 | cds_wfq_init(&ust_cmd_queue.queue); | |
4395 | ||
f6a9efaa DG |
4396 | /* Init UST app hash table */ |
4397 | ust_app_ht_alloc(); | |
4398 | ||
273ea72c | 4399 | /* |
54d01ffb DG |
4400 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4401 | * statically declared in session.c | |
273ea72c | 4402 | */ |
54d01ffb | 4403 | session_list_ptr = session_get_list(); |
b5541356 | 4404 | |
5eb91c98 DG |
4405 | /* Set up max poll set size */ |
4406 | lttng_poll_set_max_size(); | |
4407 | ||
cf3af59e | 4408 | /* Create thread to manage the client socket */ |
099e26bd DG |
4409 | ret = pthread_create(&client_thread, NULL, |
4410 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4411 | if (ret != 0) { |
099e26bd | 4412 | perror("pthread_create clients"); |
cf3af59e MD |
4413 | goto exit_client; |
4414 | } | |
fac6795d | 4415 | |
099e26bd DG |
4416 | /* Create thread to dispatch registration */ |
4417 | ret = pthread_create(&dispatch_thread, NULL, | |
4418 | thread_dispatch_ust_registration, (void *) NULL); | |
4419 | if (ret != 0) { | |
4420 | perror("pthread_create dispatch"); | |
4421 | goto exit_dispatch; | |
4422 | } | |
4423 | ||
4424 | /* Create thread to manage application registration. */ | |
4425 | ret = pthread_create(®_apps_thread, NULL, | |
4426 | thread_registration_apps, (void *) NULL); | |
4427 | if (ret != 0) { | |
4428 | perror("pthread_create registration"); | |
4429 | goto exit_reg_apps; | |
4430 | } | |
4431 | ||
cf3af59e | 4432 | /* Create thread to manage application socket */ |
54d01ffb DG |
4433 | ret = pthread_create(&apps_thread, NULL, |
4434 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4435 | if (ret != 0) { |
099e26bd | 4436 | perror("pthread_create apps"); |
cf3af59e MD |
4437 | goto exit_apps; |
4438 | } | |
fac6795d | 4439 | |
cf3af59e | 4440 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4441 | ret = pthread_create(&kernel_thread, NULL, |
4442 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4443 | if (ret != 0) { |
099e26bd | 4444 | perror("pthread_create kernel"); |
cf3af59e MD |
4445 | goto exit_kernel; |
4446 | } | |
7a485870 | 4447 | |
b25a8868 DG |
4448 | tracepoint(sessiond_boot_end); |
4449 | ||
cf3af59e MD |
4450 | ret = pthread_join(kernel_thread, &status); |
4451 | if (ret != 0) { | |
4452 | perror("pthread_join"); | |
4453 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4454 | } |
4455 | ||
cf3af59e MD |
4456 | exit_kernel: |
4457 | ret = pthread_join(apps_thread, &status); | |
4458 | if (ret != 0) { | |
4459 | perror("pthread_join"); | |
4460 | goto error; /* join error, exit without cleanup */ | |
4461 | } | |
fac6795d | 4462 | |
cf3af59e | 4463 | exit_apps: |
099e26bd DG |
4464 | ret = pthread_join(reg_apps_thread, &status); |
4465 | if (ret != 0) { | |
4466 | perror("pthread_join"); | |
4467 | goto error; /* join error, exit without cleanup */ | |
4468 | } | |
4469 | ||
4470 | exit_reg_apps: | |
4471 | ret = pthread_join(dispatch_thread, &status); | |
4472 | if (ret != 0) { | |
4473 | perror("pthread_join"); | |
4474 | goto error; /* join error, exit without cleanup */ | |
4475 | } | |
4476 | ||
4477 | exit_dispatch: | |
cf3af59e MD |
4478 | ret = pthread_join(client_thread, &status); |
4479 | if (ret != 0) { | |
4480 | perror("pthread_join"); | |
4481 | goto error; /* join error, exit without cleanup */ | |
4482 | } | |
4483 | ||
3bd1e081 | 4484 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4485 | if (ret != 0) { |
3bd1e081 | 4486 | perror("join_consumer"); |
cf3af59e MD |
4487 | goto error; /* join error, exit without cleanup */ |
4488 | } | |
a88df331 | 4489 | |
cf3af59e | 4490 | exit_client: |
a88df331 | 4491 | exit: |
cf3af59e MD |
4492 | /* |
4493 | * cleanup() is called when no other thread is running. | |
4494 | */ | |
f6a9efaa | 4495 | rcu_thread_online(); |
cf3af59e | 4496 | cleanup(); |
f6a9efaa DG |
4497 | rcu_thread_offline(); |
4498 | rcu_unregister_thread(); | |
cf3af59e MD |
4499 | if (!ret) |
4500 | exit(EXIT_SUCCESS); | |
4501 | error: | |
5e16da05 | 4502 | exit(EXIT_FAILURE); |
fac6795d | 4503 | } |