Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
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 | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
8c0faa1d | 24 | #include <semaphore.h> |
fac6795d DG |
25 | #include <signal.h> |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c DG |
35 | #include <sys/wait.h> |
36 | #include <urcu/futex.h> | |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
54d01ffb | 48 | #include "channel.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
4771f025 | 52 | #include "kernel.h" |
096102bd | 53 | #include "modprobe.h" |
0fdd1e2c | 54 | #include "shm.h" |
1e307fab | 55 | #include "ust-ctl.h" |
8e68d1c8 | 56 | #include "utils.h" |
fac6795d | 57 | |
ebaeda94 MD |
58 | #define CONSUMERD_FILE "lttng-consumerd" |
59 | ||
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 80 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d | 92 | static int opt_daemon; |
4fba7219 | 93 | static int opt_no_kernel; |
fac6795d | 94 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 95 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 96 | static char *rundir; |
3bd1e081 MD |
97 | |
98 | /* Consumer daemon specific control data */ | |
99 | static struct consumer_data kconsumer_data = { | |
100 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
106 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
107 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
113 | }; |
114 | ||
099e26bd | 115 | static int dispatch_thread_exit; |
fac6795d | 116 | |
54d01ffb DG |
117 | /* Global application Unix socket path */ |
118 | static char apps_unix_sock_path[PATH_MAX]; | |
119 | /* Global client Unix socket path */ | |
120 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
121 | /* global wait shm path for UST */ |
122 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 123 | |
1d4b027a | 124 | /* Sockets and FDs */ |
a4b35e07 MD |
125 | static int client_sock = -1; |
126 | static int apps_sock = -1; | |
127 | static int kernel_tracer_fd = -1; | |
76d7553f | 128 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 129 | |
273ea72c DG |
130 | /* |
131 | * Quit pipe for all threads. This permits a single cancellation point | |
132 | * for all threads when receiving an event on the pipe. | |
133 | */ | |
76d7553f | 134 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 135 | |
099e26bd DG |
136 | /* |
137 | * This pipe is used to inform the thread managing application communication | |
138 | * that a command is queued and ready to be processed. | |
139 | */ | |
76d7553f | 140 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 141 | |
1d4b027a | 142 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 143 | static pthread_t apps_thread; |
099e26bd | 144 | static pthread_t reg_apps_thread; |
1d4b027a | 145 | static pthread_t client_thread; |
7a485870 | 146 | static pthread_t kernel_thread; |
099e26bd | 147 | static pthread_t dispatch_thread; |
5eb91c98 | 148 | |
fac6795d | 149 | |
099e26bd DG |
150 | /* |
151 | * UST registration command queue. This queue is tied with a futex and uses a N | |
152 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
153 | * | |
154 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
155 | * this queue and the wait/wake scheme. | |
156 | */ | |
157 | static struct ust_cmd_queue ust_cmd_queue; | |
158 | ||
b5541356 DG |
159 | /* |
160 | * Pointer initialized before thread creation. | |
161 | * | |
162 | * This points to the tracing session list containing the session count and a | |
163 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
164 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 165 | * |
d063d709 | 166 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 167 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
168 | */ |
169 | static struct ltt_session_list *session_list_ptr; | |
170 | ||
7753dea8 MD |
171 | int ust_consumerd64_fd = -1; |
172 | int ust_consumerd32_fd = -1; | |
173 | ||
fb6f1fa2 YB |
174 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
175 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
176 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
177 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a MD |
178 | |
179 | static | |
7753dea8 | 180 | void setup_consumerd_path(void) |
fb09408a | 181 | { |
fc7a59ce | 182 | const char *bin, *libdir; |
fb09408a | 183 | |
7753dea8 MD |
184 | /* |
185 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
186 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
187 | * has not been defined. | |
7753dea8 | 188 | */ |
ebaeda94 | 189 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
190 | if (!consumerd32_bin[0]) { |
191 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
192 | } |
193 | if (!consumerd32_libdir[0]) { | |
194 | consumerd32_libdir = INSTALL_LIB_PATH; | |
195 | } | |
196 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
197 | if (!consumerd64_bin[0]) { |
198 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 199 | } |
ebaeda94 MD |
200 | if (!consumerd64_libdir[0]) { |
201 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
202 | } |
203 | #else | |
204 | #error "Unknown bitness" | |
205 | #endif | |
206 | ||
fb09408a MD |
207 | /* |
208 | * runtime env. var. overrides the build default. | |
209 | */ | |
fc7a59ce AM |
210 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
211 | if (bin) { | |
212 | consumerd32_bin = bin; | |
7753dea8 | 213 | } |
fc7a59ce AM |
214 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
215 | if (bin) { | |
216 | consumerd64_bin = bin; | |
ebaeda94 | 217 | } |
72f579ee | 218 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
219 | if (libdir) { |
220 | consumerd32_libdir = libdir; | |
221 | } | |
72f579ee | 222 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
223 | if (libdir) { |
224 | consumerd64_libdir = libdir; | |
fb09408a MD |
225 | } |
226 | } | |
227 | ||
5eb91c98 DG |
228 | /* |
229 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
230 | */ | |
231 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
232 | unsigned int size) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | if (events == NULL || size == 0) { | |
237 | ret = -1; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
242 | if (ret < 0) { | |
243 | goto error; | |
244 | } | |
245 | ||
246 | /* Add quit pipe */ | |
247 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
248 | if (ret < 0) { | |
249 | goto error; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | ||
254 | error: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Check if the thread quit pipe was triggered. | |
260 | * | |
261 | * Return 1 if it was triggered else 0; | |
262 | */ | |
263 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
264 | { | |
265 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
266 | return 1; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
0fdd1e2c DG |
272 | /* |
273 | * Return group ID of the tracing group or -1 if not found. | |
274 | */ | |
996b65c8 MD |
275 | static gid_t allowed_group(void) |
276 | { | |
277 | struct group *grp; | |
278 | ||
274e143b MD |
279 | if (opt_tracing_group) { |
280 | grp = getgrnam(opt_tracing_group); | |
281 | } else { | |
282 | grp = getgrnam(default_tracing_group); | |
283 | } | |
996b65c8 MD |
284 | if (!grp) { |
285 | return -1; | |
286 | } else { | |
287 | return grp->gr_gid; | |
288 | } | |
289 | } | |
290 | ||
273ea72c | 291 | /* |
5eb91c98 | 292 | * Init thread quit pipe. |
273ea72c DG |
293 | * |
294 | * Return -1 on error or 0 if all pipes are created. | |
295 | */ | |
296 | static int init_thread_quit_pipe(void) | |
297 | { | |
730389d9 | 298 | int ret, i; |
273ea72c | 299 | |
730389d9 | 300 | ret = pipe(thread_quit_pipe); |
273ea72c | 301 | if (ret < 0) { |
730389d9 | 302 | PERROR("thread quit pipe"); |
273ea72c DG |
303 | goto error; |
304 | } | |
305 | ||
730389d9 DG |
306 | for (i = 0; i < 2; i++) { |
307 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
308 | if (ret < 0) { | |
309 | PERROR("fcntl"); | |
310 | goto error; | |
311 | } | |
312 | } | |
313 | ||
273ea72c DG |
314 | error: |
315 | return ret; | |
316 | } | |
317 | ||
fac6795d | 318 | /* |
d063d709 DG |
319 | * Complete teardown of a kernel session. This free all data structure related |
320 | * to a kernel session and update counter. | |
fac6795d | 321 | */ |
1d4b027a | 322 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 323 | { |
8f7a84dd | 324 | if (!session->kernel_session) { |
99bab54f | 325 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 326 | return; |
8f7a84dd DG |
327 | } |
328 | ||
84ea9c99 | 329 | DBG("Tearing down kernel session"); |
d9800920 | 330 | |
84ea9c99 MD |
331 | /* |
332 | * If a custom kernel consumer was registered, close the socket before | |
333 | * tearing down the complete kernel session structure | |
334 | */ | |
335 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
336 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 337 | } |
84ea9c99 MD |
338 | |
339 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
340 | } |
341 | ||
f6a9efaa DG |
342 | /* |
343 | * Complete teardown of all UST sessions. This will free everything on his path | |
344 | * and destroy the core essence of all ust sessions :) | |
345 | */ | |
346 | static void teardown_ust_session(struct ltt_session *session) | |
347 | { | |
84cd17c6 MD |
348 | int ret; |
349 | ||
8f7a84dd | 350 | if (!session->ust_session) { |
99bab54f | 351 | DBG3("No UST session when tearing down session"); |
f470a390 | 352 | return; |
8f7a84dd DG |
353 | } |
354 | ||
84ea9c99 | 355 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 356 | |
84cd17c6 MD |
357 | ret = ust_app_destroy_trace_all(session->ust_session); |
358 | if (ret) { | |
359 | ERR("Error in ust_app_destroy_trace_all"); | |
360 | } | |
8f7a84dd | 361 | |
f6a9efaa DG |
362 | trace_ust_destroy_session(session->ust_session); |
363 | } | |
364 | ||
099e26bd DG |
365 | /* |
366 | * Stop all threads by closing the thread quit pipe. | |
367 | */ | |
cf3af59e MD |
368 | static void stop_threads(void) |
369 | { | |
5eb91c98 DG |
370 | int ret; |
371 | ||
cf3af59e MD |
372 | /* Stopping all threads */ |
373 | DBG("Terminating all threads"); | |
54d01ffb | 374 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
375 | if (ret < 0) { |
376 | ERR("write error on thread quit pipe"); | |
377 | } | |
378 | ||
099e26bd DG |
379 | /* Dispatch thread */ |
380 | dispatch_thread_exit = 1; | |
381 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
382 | } |
383 | ||
fac6795d | 384 | /* |
d063d709 | 385 | * Cleanup the daemon |
fac6795d | 386 | */ |
cf3af59e | 387 | static void cleanup(void) |
fac6795d | 388 | { |
76d7553f | 389 | int ret, i; |
1d4b027a | 390 | char *cmd; |
af9737e9 | 391 | struct ltt_session *sess, *stmp; |
fac6795d | 392 | |
1d4b027a | 393 | DBG("Cleaning up"); |
e07ae692 | 394 | |
67e40797 DG |
395 | DBG("Removing %s directory", rundir); |
396 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
397 | if (ret < 0) { | |
398 | ERR("asprintf failed. Something is really wrong!"); | |
399 | } | |
5461b305 | 400 | |
67e40797 DG |
401 | /* Remove lttng run directory */ |
402 | ret = system(cmd); | |
403 | if (ret < 0) { | |
404 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 405 | } |
67e40797 | 406 | free(cmd); |
5461b305 | 407 | |
99bab54f | 408 | DBG("Cleaning up all sessions"); |
fac6795d | 409 | |
b5541356 | 410 | /* Destroy session list mutex */ |
273ea72c DG |
411 | if (session_list_ptr != NULL) { |
412 | pthread_mutex_destroy(&session_list_ptr->lock); | |
413 | ||
414 | /* Cleanup ALL session */ | |
54d01ffb DG |
415 | cds_list_for_each_entry_safe(sess, stmp, |
416 | &session_list_ptr->head, list) { | |
273ea72c | 417 | teardown_kernel_session(sess); |
f6a9efaa DG |
418 | teardown_ust_session(sess); |
419 | free(sess); | |
273ea72c DG |
420 | } |
421 | } | |
422 | ||
099e26bd | 423 | DBG("Closing all UST sockets"); |
56fff090 | 424 | ust_app_clean_list(); |
099e26bd | 425 | |
3bd1e081 | 426 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 427 | |
4fba7219 DG |
428 | if (is_root && !opt_no_kernel) { |
429 | DBG2("Closing kernel fd"); | |
a4b35e07 | 430 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
431 | ret = close(kernel_tracer_fd); |
432 | if (ret) { | |
433 | PERROR("close"); | |
434 | } | |
a4b35e07 | 435 | } |
2f50c8a3 | 436 | DBG("Unloading kernel modules"); |
096102bd | 437 | modprobe_remove_lttng_all(); |
2f50c8a3 | 438 | } |
5eb91c98 | 439 | |
76d7553f MD |
440 | /* |
441 | * Closing all pipes used for communication between threads. | |
442 | */ | |
443 | for (i = 0; i < 2; i++) { | |
444 | if (kernel_poll_pipe[i] >= 0) { | |
445 | ret = close(kernel_poll_pipe[i]); | |
446 | if (ret) { | |
447 | PERROR("close"); | |
448 | } | |
449 | ||
450 | } | |
451 | } | |
452 | for (i = 0; i < 2; i++) { | |
453 | if (thread_quit_pipe[i] >= 0) { | |
454 | ret = close(thread_quit_pipe[i]); | |
455 | if (ret) { | |
456 | PERROR("close"); | |
457 | } | |
458 | } | |
459 | } | |
460 | for (i = 0; i < 2; i++) { | |
461 | if (apps_cmd_pipe[i] >= 0) { | |
462 | ret = close(apps_cmd_pipe[i]); | |
463 | if (ret) { | |
464 | PERROR("close"); | |
465 | } | |
466 | } | |
467 | } | |
421cb601 DG |
468 | |
469 | /* <fun> */ | |
f56a39af | 470 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
471 | "Matthew, BEET driven development works!%c[%dm", |
472 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
473 | /* </fun> */ | |
fac6795d DG |
474 | } |
475 | ||
e065084a | 476 | /* |
d063d709 | 477 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 478 | * |
d063d709 | 479 | * Return lttcomm error code. |
e065084a DG |
480 | */ |
481 | static int send_unix_sock(int sock, void *buf, size_t len) | |
482 | { | |
483 | /* Check valid length */ | |
484 | if (len <= 0) { | |
485 | return -1; | |
486 | } | |
487 | ||
488 | return lttcomm_send_unix_sock(sock, buf, len); | |
489 | } | |
490 | ||
5461b305 | 491 | /* |
d063d709 | 492 | * Free memory of a command context structure. |
5461b305 | 493 | */ |
a2fb29a5 | 494 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 495 | { |
a2fb29a5 DG |
496 | DBG("Clean command context structure"); |
497 | if (*cmd_ctx) { | |
498 | if ((*cmd_ctx)->llm) { | |
499 | free((*cmd_ctx)->llm); | |
5461b305 | 500 | } |
a2fb29a5 DG |
501 | if ((*cmd_ctx)->lsm) { |
502 | free((*cmd_ctx)->lsm); | |
5461b305 | 503 | } |
a2fb29a5 DG |
504 | free(*cmd_ctx); |
505 | *cmd_ctx = NULL; | |
5461b305 DG |
506 | } |
507 | } | |
508 | ||
f3ed775e | 509 | /* |
d063d709 | 510 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 511 | */ |
2bdd86d4 | 512 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
6df2e2c9 MD |
513 | int sock, struct ltt_kernel_channel *channel, |
514 | uid_t uid, gid_t gid) | |
f3ed775e DG |
515 | { |
516 | int ret; | |
f3ed775e | 517 | struct ltt_kernel_stream *stream; |
3bd1e081 | 518 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 519 | |
3bd1e081 | 520 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 521 | channel->channel->name); |
f3ed775e | 522 | |
3bd1e081 MD |
523 | /* Send channel */ |
524 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
525 | lkm.u.channel.channel_key = channel->fd; | |
526 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
527 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 528 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 529 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 530 | if (ret < 0) { |
76d7553f | 531 | PERROR("send consumer channel"); |
f3ed775e DG |
532 | goto error; |
533 | } | |
534 | ||
3bd1e081 | 535 | /* Send streams */ |
7a485870 | 536 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
537 | if (!stream->fd) { |
538 | continue; | |
539 | } | |
540 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
541 | lkm.u.stream.channel_key = channel->fd; | |
542 | lkm.u.stream.stream_key = stream->fd; | |
543 | lkm.u.stream.state = stream->state; | |
544 | lkm.u.stream.output = channel->channel->attr.output; | |
545 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
546 | lkm.u.stream.uid = uid; |
547 | lkm.u.stream.gid = gid; | |
3bd1e081 MD |
548 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
549 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
550 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
551 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
552 | if (ret < 0) { | |
76d7553f | 553 | PERROR("send consumer stream"); |
3bd1e081 MD |
554 | goto error; |
555 | } | |
556 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
557 | if (ret < 0) { | |
76d7553f | 558 | PERROR("send consumer stream ancillary data"); |
3bd1e081 | 559 | goto error; |
f3ed775e DG |
560 | } |
561 | } | |
562 | ||
3bd1e081 | 563 | DBG("consumer channel streams sent"); |
f3ed775e DG |
564 | |
565 | return 0; | |
566 | ||
567 | error: | |
568 | return ret; | |
569 | } | |
570 | ||
571 | /* | |
d063d709 | 572 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 573 | */ |
2bdd86d4 | 574 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 575 | struct ltt_kernel_session *session) |
f3ed775e DG |
576 | { |
577 | int ret; | |
578 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
579 | struct lttcomm_consumer_msg lkm; |
580 | int sock = session->consumer_fd; | |
7a485870 DG |
581 | |
582 | DBG("Sending metadata stream fd"); | |
583 | ||
2bdd86d4 | 584 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 585 | if (session->consumer_fd == 0) { |
3bd1e081 | 586 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
587 | } |
588 | ||
7a485870 | 589 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
590 | /* Send metadata channel fd */ |
591 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
592 | lkm.u.channel.channel_key = session->metadata->fd; | |
593 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
594 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
595 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
596 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
597 | if (ret < 0) { | |
76d7553f | 598 | PERROR("send consumer channel"); |
3bd1e081 MD |
599 | goto error; |
600 | } | |
601 | ||
602 | /* Send metadata stream fd */ | |
603 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
604 | lkm.u.stream.channel_key = session->metadata->fd; | |
605 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
606 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
607 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
608 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
6df2e2c9 MD |
609 | lkm.u.stream.uid = session->uid; |
610 | lkm.u.stream.gid = session->gid; | |
3bd1e081 MD |
611 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
612 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
613 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
614 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
615 | if (ret < 0) { | |
76d7553f | 616 | PERROR("send consumer stream"); |
3bd1e081 MD |
617 | goto error; |
618 | } | |
619 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 620 | if (ret < 0) { |
76d7553f | 621 | PERROR("send consumer stream"); |
7a485870 DG |
622 | goto error; |
623 | } | |
624 | } | |
f3ed775e | 625 | |
f3ed775e | 626 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
6df2e2c9 MD |
627 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan, |
628 | session->uid, session->gid); | |
2bdd86d4 MD |
629 | if (ret < 0) { |
630 | goto error; | |
631 | } | |
632 | } | |
633 | ||
634 | DBG("consumer fds (metadata and channel streams) sent"); | |
635 | ||
636 | return 0; | |
637 | ||
638 | error: | |
639 | return ret; | |
640 | } | |
641 | ||
fac6795d | 642 | /* |
0fdd1e2c | 643 | * Notify UST applications using the shm mmap futex. |
fac6795d | 644 | */ |
0fdd1e2c | 645 | static int notify_ust_apps(int active) |
fac6795d | 646 | { |
0fdd1e2c | 647 | char *wait_shm_mmap; |
fac6795d | 648 | |
0fdd1e2c | 649 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 650 | |
0fdd1e2c DG |
651 | /* See shm.c for this call implying mmap, shm and futex calls */ |
652 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
653 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
654 | goto error; |
655 | } | |
656 | ||
0fdd1e2c DG |
657 | /* Wake waiting process */ |
658 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
659 | ||
660 | /* Apps notified successfully */ | |
661 | return 0; | |
fac6795d DG |
662 | |
663 | error: | |
0fdd1e2c | 664 | return -1; |
fac6795d DG |
665 | } |
666 | ||
e065084a | 667 | /* |
d063d709 DG |
668 | * Setup the outgoing data buffer for the response (llm) by allocating the |
669 | * right amount of memory and copying the original information from the lsm | |
670 | * structure. | |
ca95a216 | 671 | * |
d063d709 | 672 | * Return total size of the buffer pointed by buf. |
ca95a216 | 673 | */ |
5461b305 | 674 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 675 | { |
f3ed775e | 676 | int ret, buf_size; |
ca95a216 | 677 | |
f3ed775e | 678 | buf_size = size; |
5461b305 | 679 | |
ba7f0ae5 | 680 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 681 | if (cmd_ctx->llm == NULL) { |
76d7553f | 682 | PERROR("zmalloc"); |
5461b305 | 683 | ret = -ENOMEM; |
ca95a216 DG |
684 | goto error; |
685 | } | |
686 | ||
5461b305 DG |
687 | /* Copy common data */ |
688 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 689 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 690 | |
5461b305 DG |
691 | cmd_ctx->llm->data_size = size; |
692 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
693 | ||
ca95a216 DG |
694 | return buf_size; |
695 | ||
696 | error: | |
697 | return ret; | |
698 | } | |
699 | ||
7a485870 | 700 | /* |
5eb91c98 | 701 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 702 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 703 | */ |
5eb91c98 | 704 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 705 | { |
5eb91c98 | 706 | int ret; |
7a485870 DG |
707 | struct ltt_session *session; |
708 | struct ltt_kernel_channel *channel; | |
709 | ||
5eb91c98 | 710 | DBG("Updating kernel poll set"); |
7a485870 | 711 | |
54d01ffb | 712 | session_lock_list(); |
b5541356 | 713 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 714 | session_lock(session); |
7a485870 | 715 | if (session->kernel_session == NULL) { |
54d01ffb | 716 | session_unlock(session); |
7a485870 DG |
717 | continue; |
718 | } | |
7a485870 | 719 | |
54d01ffb DG |
720 | cds_list_for_each_entry(channel, |
721 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
722 | /* Add channel fd to the kernel poll set */ |
723 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
724 | if (ret < 0) { | |
54d01ffb | 725 | session_unlock(session); |
5eb91c98 DG |
726 | goto error; |
727 | } | |
728 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 729 | } |
54d01ffb | 730 | session_unlock(session); |
7a485870 | 731 | } |
54d01ffb | 732 | session_unlock_list(); |
7a485870 | 733 | |
5eb91c98 | 734 | return 0; |
7a485870 DG |
735 | |
736 | error: | |
54d01ffb | 737 | session_unlock_list(); |
7a485870 DG |
738 | return -1; |
739 | } | |
740 | ||
741 | /* | |
54d01ffb | 742 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 743 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 744 | * |
d063d709 | 745 | * Useful for CPU hotplug feature. |
7a485870 | 746 | */ |
2bdd86d4 | 747 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
748 | { |
749 | int ret = 0; | |
750 | struct ltt_session *session; | |
751 | struct ltt_kernel_channel *channel; | |
752 | ||
753 | DBG("Updating kernel streams for channel fd %d", fd); | |
754 | ||
54d01ffb | 755 | session_lock_list(); |
b5541356 | 756 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 757 | session_lock(session); |
7a485870 | 758 | if (session->kernel_session == NULL) { |
54d01ffb | 759 | session_unlock(session); |
7a485870 DG |
760 | continue; |
761 | } | |
d9800920 DG |
762 | |
763 | /* This is not suppose to be 0 but this is an extra security check */ | |
764 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 765 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
766 | } |
767 | ||
5eb91c98 DG |
768 | cds_list_for_each_entry(channel, |
769 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
770 | if (channel->fd == fd) { |
771 | DBG("Channel found, updating kernel streams"); | |
772 | ret = kernel_open_channel_stream(channel); | |
773 | if (ret < 0) { | |
b3c750d2 | 774 | goto error; |
7a485870 | 775 | } |
d9800920 | 776 | |
7a485870 | 777 | /* |
5eb91c98 DG |
778 | * Have we already sent fds to the consumer? If yes, it means |
779 | * that tracing is started so it is safe to send our updated | |
780 | * stream fds. | |
7a485870 | 781 | */ |
3bd1e081 | 782 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 783 | ret = send_kconsumer_channel_streams(consumer_data, |
6df2e2c9 MD |
784 | session->kernel_session->consumer_fd, channel, |
785 | session->uid, session->gid); | |
7a485870 | 786 | if (ret < 0) { |
b3c750d2 | 787 | goto error; |
7a485870 DG |
788 | } |
789 | } | |
b3c750d2 | 790 | goto error; |
7a485870 DG |
791 | } |
792 | } | |
54d01ffb | 793 | session_unlock(session); |
7a485870 | 794 | } |
54d01ffb | 795 | session_unlock_list(); |
b3c750d2 | 796 | return ret; |
7a485870 | 797 | |
b3c750d2 | 798 | error: |
54d01ffb DG |
799 | session_unlock(session); |
800 | session_unlock_list(); | |
7a485870 DG |
801 | return ret; |
802 | } | |
803 | ||
487cf67c DG |
804 | /* |
805 | * For each tracing session, update newly registered apps. | |
806 | */ | |
807 | static void update_ust_app(int app_sock) | |
808 | { | |
809 | struct ltt_session *sess, *stmp; | |
810 | ||
4ee14516 DG |
811 | session_lock_list(); |
812 | ||
487cf67c DG |
813 | /* For all tracing session(s) */ |
814 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 815 | session_lock(sess); |
421cb601 DG |
816 | if (sess->ust_session) { |
817 | ust_app_global_update(sess->ust_session, app_sock); | |
818 | } | |
4ee14516 | 819 | session_unlock(sess); |
487cf67c | 820 | } |
4ee14516 DG |
821 | |
822 | session_unlock_list(); | |
487cf67c DG |
823 | } |
824 | ||
7a485870 | 825 | /* |
d063d709 | 826 | * This thread manage event coming from the kernel. |
7a485870 | 827 | * |
d063d709 DG |
828 | * Features supported in this thread: |
829 | * -) CPU Hotplug | |
7a485870 DG |
830 | */ |
831 | static void *thread_manage_kernel(void *data) | |
832 | { | |
5eb91c98 DG |
833 | int ret, i, pollfd, update_poll_flag = 1; |
834 | uint32_t revents, nb_fd; | |
7a485870 | 835 | char tmp; |
5eb91c98 | 836 | struct lttng_poll_event events; |
7a485870 DG |
837 | |
838 | DBG("Thread manage kernel started"); | |
839 | ||
5eb91c98 DG |
840 | ret = create_thread_poll_set(&events, 2); |
841 | if (ret < 0) { | |
76d7553f | 842 | goto error_poll_create; |
5eb91c98 DG |
843 | } |
844 | ||
845 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
846 | if (ret < 0) { | |
847 | goto error; | |
848 | } | |
849 | ||
7a485870 DG |
850 | while (1) { |
851 | if (update_poll_flag == 1) { | |
5f822d0a DG |
852 | /* |
853 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
854 | * quit pipe and the kernel pipe. | |
855 | */ | |
856 | events.nb_fd = 2; | |
857 | ||
5eb91c98 DG |
858 | ret = update_kernel_poll(&events); |
859 | if (ret < 0) { | |
7a485870 DG |
860 | goto error; |
861 | } | |
862 | update_poll_flag = 0; | |
863 | } | |
864 | ||
5eb91c98 DG |
865 | nb_fd = LTTNG_POLL_GETNB(&events); |
866 | ||
867 | DBG("Thread kernel polling on %d fds", nb_fd); | |
868 | ||
869 | /* Zeroed the poll events */ | |
870 | lttng_poll_reset(&events); | |
7a485870 DG |
871 | |
872 | /* Poll infinite value of time */ | |
88f2b785 | 873 | restart: |
5eb91c98 | 874 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 875 | if (ret < 0) { |
88f2b785 MD |
876 | /* |
877 | * Restart interrupted system call. | |
878 | */ | |
879 | if (errno == EINTR) { | |
880 | goto restart; | |
881 | } | |
7a485870 DG |
882 | goto error; |
883 | } else if (ret == 0) { | |
884 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
885 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
886 | "This should not have happened! Continuing..."); | |
7a485870 DG |
887 | continue; |
888 | } | |
889 | ||
5eb91c98 DG |
890 | for (i = 0; i < nb_fd; i++) { |
891 | /* Fetch once the poll data */ | |
892 | revents = LTTNG_POLL_GETEV(&events, i); | |
893 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 894 | |
5eb91c98 DG |
895 | /* Thread quit pipe has been closed. Killing thread. */ |
896 | ret = check_thread_quit_pipe(pollfd, revents); | |
897 | if (ret) { | |
898 | goto error; | |
899 | } | |
7a485870 | 900 | |
5eb91c98 DG |
901 | /* Check for data on kernel pipe */ |
902 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
903 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
904 | update_poll_flag = 1; | |
905 | continue; | |
906 | } else { | |
907 | /* | |
908 | * New CPU detected by the kernel. Adding kernel stream to | |
909 | * kernel session and updating the kernel consumer | |
910 | */ | |
911 | if (revents & LPOLLIN) { | |
2bdd86d4 | 912 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
913 | if (ret < 0) { |
914 | continue; | |
915 | } | |
916 | break; | |
917 | /* | |
918 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
919 | * and unregister kernel stream at this point. | |
920 | */ | |
7a485870 | 921 | } |
7a485870 DG |
922 | } |
923 | } | |
924 | } | |
925 | ||
926 | error: | |
5eb91c98 | 927 | lttng_poll_clean(&events); |
76d7553f MD |
928 | error_poll_create: |
929 | DBG("Kernel thread dying"); | |
7a485870 DG |
930 | return NULL; |
931 | } | |
932 | ||
1d4b027a | 933 | /* |
3bd1e081 | 934 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 935 | */ |
3bd1e081 | 936 | static void *thread_manage_consumer(void *data) |
1d4b027a | 937 | { |
76d7553f | 938 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 939 | uint32_t revents, nb_fd; |
1d4b027a | 940 | enum lttcomm_return_code code; |
5eb91c98 | 941 | struct lttng_poll_event events; |
3bd1e081 | 942 | struct consumer_data *consumer_data = data; |
1d4b027a | 943 | |
3bd1e081 | 944 | DBG("[thread] Manage consumer started"); |
1d4b027a | 945 | |
3bd1e081 | 946 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 947 | if (ret < 0) { |
76d7553f | 948 | goto error_listen; |
1d4b027a DG |
949 | } |
950 | ||
5eb91c98 DG |
951 | /* |
952 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
953 | * Nothing more will be added to this poll set. | |
954 | */ | |
955 | ret = create_thread_poll_set(&events, 2); | |
956 | if (ret < 0) { | |
76d7553f | 957 | goto error_poll; |
5eb91c98 | 958 | } |
273ea72c | 959 | |
3bd1e081 | 960 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
961 | if (ret < 0) { |
962 | goto error; | |
963 | } | |
964 | ||
965 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
966 | |
967 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 968 | restart: |
5eb91c98 | 969 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 970 | if (ret < 0) { |
88f2b785 MD |
971 | /* |
972 | * Restart interrupted system call. | |
973 | */ | |
974 | if (errno == EINTR) { | |
975 | goto restart; | |
976 | } | |
273ea72c DG |
977 | goto error; |
978 | } | |
979 | ||
5eb91c98 DG |
980 | for (i = 0; i < nb_fd; i++) { |
981 | /* Fetch once the poll data */ | |
982 | revents = LTTNG_POLL_GETEV(&events, i); | |
983 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
984 | ||
985 | /* Thread quit pipe has been closed. Killing thread. */ | |
986 | ret = check_thread_quit_pipe(pollfd, revents); | |
987 | if (ret) { | |
988 | goto error; | |
989 | } | |
990 | ||
991 | /* Event on the registration socket */ | |
3bd1e081 | 992 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 993 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 994 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
995 | goto error; |
996 | } | |
997 | } | |
273ea72c DG |
998 | } |
999 | ||
3bd1e081 | 1000 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1001 | if (sock < 0) { |
1002 | goto error; | |
1003 | } | |
1004 | ||
3bd1e081 | 1005 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1006 | |
712ea556 | 1007 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1008 | ret = lttcomm_recv_unix_sock(sock, &code, |
1009 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1010 | if (ret <= 0) { |
1011 | goto error; | |
1012 | } | |
1013 | ||
3bd1e081 MD |
1014 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
1015 | consumer_data->cmd_sock = | |
1016 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1017 | if (consumer_data->cmd_sock < 0) { | |
1018 | sem_post(&consumer_data->sem); | |
48842b30 | 1019 | PERROR("consumer connect"); |
1d4b027a DG |
1020 | goto error; |
1021 | } | |
1022 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1023 | sem_post(&consumer_data->sem); |
1024 | DBG("consumer command socket ready"); | |
1d4b027a | 1025 | } else { |
3bd1e081 | 1026 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1027 | lttcomm_get_readable_code(-code)); |
1028 | goto error; | |
1029 | } | |
1030 | ||
54d01ffb | 1031 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1032 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1033 | if (ret < 0) { |
72079cae DG |
1034 | goto error; |
1035 | } | |
1036 | ||
5eb91c98 DG |
1037 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1038 | if (ret < 0) { | |
72079cae | 1039 | goto error; |
5eb91c98 DG |
1040 | } |
1041 | ||
1042 | /* Update number of fd */ | |
1043 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1044 | ||
1045 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1046 | restart_poll: |
5eb91c98 DG |
1047 | ret = lttng_poll_wait(&events, -1); |
1048 | if (ret < 0) { | |
88f2b785 MD |
1049 | /* |
1050 | * Restart interrupted system call. | |
1051 | */ | |
1052 | if (errno == EINTR) { | |
1053 | goto restart_poll; | |
1054 | } | |
72079cae DG |
1055 | goto error; |
1056 | } | |
1057 | ||
5eb91c98 DG |
1058 | for (i = 0; i < nb_fd; i++) { |
1059 | /* Fetch once the poll data */ | |
1060 | revents = LTTNG_POLL_GETEV(&events, i); | |
1061 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1062 | ||
1063 | /* Thread quit pipe has been closed. Killing thread. */ | |
1064 | ret = check_thread_quit_pipe(pollfd, revents); | |
1065 | if (ret) { | |
1066 | goto error; | |
1067 | } | |
1068 | ||
1069 | /* Event on the kconsumerd socket */ | |
1070 | if (pollfd == sock) { | |
1071 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1072 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1073 | goto error; |
1074 | } | |
1075 | } | |
1076 | } | |
1077 | ||
712ea556 | 1078 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1079 | ret = lttcomm_recv_unix_sock(sock, &code, |
1080 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1081 | if (ret <= 0) { |
3bd1e081 | 1082 | ERR("consumer closed the command socket"); |
712ea556 | 1083 | goto error; |
6f61d021 | 1084 | } |
1d4b027a | 1085 | |
3bd1e081 | 1086 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1087 | |
1d4b027a | 1088 | error: |
76d7553f MD |
1089 | if (consumer_data->err_sock >= 0) { |
1090 | ret = close(consumer_data->err_sock); | |
1091 | if (ret) { | |
1092 | PERROR("close"); | |
1093 | } | |
1094 | } | |
1095 | if (consumer_data->cmd_sock >= 0) { | |
1096 | ret = close(consumer_data->cmd_sock); | |
1097 | if (ret) { | |
1098 | PERROR("close"); | |
1099 | } | |
1100 | } | |
1101 | if (sock >= 0) { | |
1102 | ret = close(sock); | |
1103 | if (ret) { | |
1104 | PERROR("close"); | |
1105 | } | |
1106 | } | |
273ea72c | 1107 | |
3bd1e081 MD |
1108 | unlink(consumer_data->err_unix_sock_path); |
1109 | unlink(consumer_data->cmd_unix_sock_path); | |
1110 | consumer_data->pid = 0; | |
1d4b027a | 1111 | |
5eb91c98 | 1112 | lttng_poll_clean(&events); |
76d7553f MD |
1113 | error_poll: |
1114 | error_listen: | |
1115 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1116 | |
5eb91c98 | 1117 | return NULL; |
099e26bd DG |
1118 | } |
1119 | ||
099e26bd DG |
1120 | /* |
1121 | * This thread manage application communication. | |
1d4b027a DG |
1122 | */ |
1123 | static void *thread_manage_apps(void *data) | |
099e26bd | 1124 | { |
5eb91c98 DG |
1125 | int i, ret, pollfd; |
1126 | uint32_t revents, nb_fd; | |
099e26bd | 1127 | struct ust_command ust_cmd; |
5eb91c98 | 1128 | struct lttng_poll_event events; |
099e26bd DG |
1129 | |
1130 | DBG("[thread] Manage application started"); | |
1131 | ||
f6a9efaa DG |
1132 | rcu_register_thread(); |
1133 | rcu_thread_online(); | |
1134 | ||
5eb91c98 DG |
1135 | ret = create_thread_poll_set(&events, 2); |
1136 | if (ret < 0) { | |
76d7553f | 1137 | goto error_poll_create; |
5eb91c98 | 1138 | } |
099e26bd | 1139 | |
5eb91c98 DG |
1140 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1141 | if (ret < 0) { | |
1142 | goto error; | |
1143 | } | |
099e26bd | 1144 | |
5eb91c98 DG |
1145 | while (1) { |
1146 | /* Zeroed the events structure */ | |
1147 | lttng_poll_reset(&events); | |
0177d773 | 1148 | |
5eb91c98 | 1149 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1150 | |
1151 | DBG("Apps thread polling on %d fds", nb_fd); | |
1152 | ||
1153 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1154 | restart: |
5eb91c98 | 1155 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1156 | if (ret < 0) { |
88f2b785 MD |
1157 | /* |
1158 | * Restart interrupted system call. | |
1159 | */ | |
1160 | if (errno == EINTR) { | |
1161 | goto restart; | |
1162 | } | |
099e26bd DG |
1163 | goto error; |
1164 | } | |
1165 | ||
5eb91c98 DG |
1166 | for (i = 0; i < nb_fd; i++) { |
1167 | /* Fetch once the poll data */ | |
1168 | revents = LTTNG_POLL_GETEV(&events, i); | |
1169 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1170 | ||
1171 | /* Thread quit pipe has been closed. Killing thread. */ | |
1172 | ret = check_thread_quit_pipe(pollfd, revents); | |
1173 | if (ret) { | |
099e26bd | 1174 | goto error; |
5eb91c98 | 1175 | } |
099e26bd | 1176 | |
5eb91c98 DG |
1177 | /* Inspect the apps cmd pipe */ |
1178 | if (pollfd == apps_cmd_pipe[0]) { | |
1179 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1180 | ERR("Apps command pipe error"); | |
0177d773 | 1181 | goto error; |
5eb91c98 DG |
1182 | } else if (revents & LPOLLIN) { |
1183 | /* Empty pipe */ | |
1184 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1185 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1186 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1187 | goto error; |
1188 | } | |
099e26bd | 1189 | |
5eb91c98 | 1190 | /* Register applicaton to the session daemon */ |
56fff090 | 1191 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1192 | ust_cmd.sock); |
88ff5b7f | 1193 | if (ret == -ENOMEM) { |
5eb91c98 | 1194 | goto error; |
88ff5b7f MD |
1195 | } else if (ret < 0) { |
1196 | break; | |
5eb91c98 DG |
1197 | } |
1198 | ||
acc7b41b | 1199 | /* |
e0c7ec2b | 1200 | * Validate UST version compatibility. |
acc7b41b | 1201 | */ |
e0c7ec2b DG |
1202 | ret = ust_app_validate_version(ust_cmd.sock); |
1203 | if (ret >= 0) { | |
1204 | /* | |
1205 | * Add channel(s) and event(s) to newly registered apps | |
1206 | * from lttng global UST domain. | |
1207 | */ | |
1208 | update_ust_app(ust_cmd.sock); | |
1209 | } | |
acc7b41b | 1210 | |
f2ca2e25 | 1211 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1212 | if (ret < 0) { |
1213 | /* | |
1214 | * If the registration is not possible, we simply | |
1215 | * unregister the apps and continue | |
1216 | */ | |
56fff090 | 1217 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1218 | } else { |
1219 | /* | |
1220 | * We just need here to monitor the close of the UST | |
1221 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1222 | * Listen on POLLIN (even if we never expect any |
1223 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1224 | */ |
a9ade966 | 1225 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1226 | if (ret < 0) { |
1227 | goto error; | |
1228 | } | |
1229 | ||
54d01ffb DG |
1230 | DBG("Apps with sock %d added to poll set", |
1231 | ust_cmd.sock); | |
5eb91c98 | 1232 | } |
487cf67c | 1233 | |
5eb91c98 | 1234 | break; |
0177d773 | 1235 | } |
5eb91c98 DG |
1236 | } else { |
1237 | /* | |
54d01ffb DG |
1238 | * At this point, we know that a registered application made |
1239 | * the event at poll_wait. | |
5eb91c98 DG |
1240 | */ |
1241 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1242 | /* Removing from the poll set */ | |
1243 | ret = lttng_poll_del(&events, pollfd); | |
1244 | if (ret < 0) { | |
1245 | goto error; | |
1246 | } | |
099e26bd | 1247 | |
b9d9b220 | 1248 | /* Socket closed on remote end. */ |
56fff090 | 1249 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1250 | break; |
1251 | } | |
099e26bd DG |
1252 | } |
1253 | } | |
099e26bd DG |
1254 | } |
1255 | ||
1256 | error: | |
5eb91c98 | 1257 | lttng_poll_clean(&events); |
76d7553f MD |
1258 | error_poll_create: |
1259 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1260 | rcu_thread_offline(); |
1261 | rcu_unregister_thread(); | |
099e26bd DG |
1262 | return NULL; |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Dispatch request from the registration threads to the application | |
1267 | * communication thread. | |
1268 | */ | |
1269 | static void *thread_dispatch_ust_registration(void *data) | |
1270 | { | |
1271 | int ret; | |
1272 | struct cds_wfq_node *node; | |
1273 | struct ust_command *ust_cmd = NULL; | |
1274 | ||
1275 | DBG("[thread] Dispatch UST command started"); | |
1276 | ||
1277 | while (!dispatch_thread_exit) { | |
1278 | /* Atomically prepare the queue futex */ | |
1279 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1280 | ||
1281 | do { | |
1282 | /* Dequeue command for registration */ | |
1283 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1284 | if (node == NULL) { | |
00a17c97 | 1285 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1286 | /* Continue thread execution */ |
1287 | break; | |
1288 | } | |
1289 | ||
1290 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1291 | ||
2f50c8a3 DG |
1292 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1293 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1294 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1295 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1296 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1297 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1298 | /* |
1299 | * Inform apps thread of the new application registration. This | |
1300 | * call is blocking so we can be assured that the data will be read | |
1301 | * at some point in time or wait to the end of the world :) | |
1302 | */ | |
1303 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1304 | sizeof(struct ust_command)); | |
1305 | if (ret < 0) { | |
76d7553f | 1306 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1307 | if (errno == EBADF) { |
1308 | /* | |
1309 | * We can't inform the application thread to process | |
1310 | * registration. We will exit or else application | |
1311 | * registration will not occur and tracing will never | |
1312 | * start. | |
1313 | */ | |
1314 | goto error; | |
1315 | } | |
1316 | } | |
1317 | free(ust_cmd); | |
1318 | } while (node != NULL); | |
1319 | ||
1320 | /* Futex wait on queue. Blocking call on futex() */ | |
1321 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1322 | } | |
1323 | ||
1324 | error: | |
1325 | DBG("Dispatch thread dying"); | |
1326 | return NULL; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * This thread manage application registration. | |
1331 | */ | |
1332 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1333 | { |
a4b35e07 | 1334 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1335 | uint32_t revents, nb_fd; |
1336 | struct lttng_poll_event events; | |
099e26bd DG |
1337 | /* |
1338 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1339 | * freed in the manage apps thread. | |
1340 | */ | |
1341 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1342 | |
099e26bd | 1343 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1344 | |
1345 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1346 | if (ret < 0) { | |
76d7553f | 1347 | goto error_listen; |
1d4b027a DG |
1348 | } |
1349 | ||
5eb91c98 DG |
1350 | /* |
1351 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1352 | * more will be added to this poll set. | |
1353 | */ | |
1354 | ret = create_thread_poll_set(&events, 2); | |
1355 | if (ret < 0) { | |
76d7553f | 1356 | goto error_create_poll; |
5eb91c98 | 1357 | } |
273ea72c | 1358 | |
5eb91c98 DG |
1359 | /* Add the application registration socket */ |
1360 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1361 | if (ret < 0) { | |
76d7553f | 1362 | goto error_poll_add; |
5eb91c98 | 1363 | } |
273ea72c | 1364 | |
1d4b027a | 1365 | /* Notify all applications to register */ |
0fdd1e2c DG |
1366 | ret = notify_ust_apps(1); |
1367 | if (ret < 0) { | |
1368 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1369 | "Execution continues but there might be problem for already\n" |
1370 | "running applications that wishes to register."); | |
0fdd1e2c | 1371 | } |
1d4b027a DG |
1372 | |
1373 | while (1) { | |
1374 | DBG("Accepting application registration"); | |
273ea72c | 1375 | |
5eb91c98 DG |
1376 | nb_fd = LTTNG_POLL_GETNB(&events); |
1377 | ||
273ea72c | 1378 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1379 | restart: |
5eb91c98 | 1380 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1381 | if (ret < 0) { |
88f2b785 MD |
1382 | /* |
1383 | * Restart interrupted system call. | |
1384 | */ | |
1385 | if (errno == EINTR) { | |
1386 | goto restart; | |
1387 | } | |
273ea72c DG |
1388 | goto error; |
1389 | } | |
1390 | ||
5eb91c98 DG |
1391 | for (i = 0; i < nb_fd; i++) { |
1392 | /* Fetch once the poll data */ | |
1393 | revents = LTTNG_POLL_GETEV(&events, i); | |
1394 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1395 | |
5eb91c98 DG |
1396 | /* Thread quit pipe has been closed. Killing thread. */ |
1397 | ret = check_thread_quit_pipe(pollfd, revents); | |
1398 | if (ret) { | |
90014c57 DG |
1399 | goto error; |
1400 | } | |
1d4b027a | 1401 | |
5eb91c98 DG |
1402 | /* Event on the registration socket */ |
1403 | if (pollfd == apps_sock) { | |
1404 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1405 | ERR("Register apps socket poll error"); | |
1406 | goto error; | |
1407 | } else if (revents & LPOLLIN) { | |
1408 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1409 | if (sock < 0) { | |
1410 | goto error; | |
1411 | } | |
099e26bd | 1412 | |
5eb91c98 | 1413 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1414 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1415 | if (ust_cmd == NULL) { |
76d7553f | 1416 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1417 | goto error; |
1418 | } | |
1d4b027a | 1419 | |
5eb91c98 DG |
1420 | /* |
1421 | * Using message-based transmissions to ensure we don't | |
1422 | * have to deal with partially received messages. | |
1423 | */ | |
1424 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1425 | sizeof(struct ust_register_msg)); | |
1426 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1427 | if (ret < 0) { | |
76d7553f | 1428 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1429 | } else { |
1430 | ERR("Wrong size received on apps register"); | |
1431 | } | |
1432 | free(ust_cmd); | |
76d7553f MD |
1433 | ret = close(sock); |
1434 | if (ret) { | |
1435 | PERROR("close"); | |
1436 | } | |
1437 | sock = -1; | |
5eb91c98 DG |
1438 | continue; |
1439 | } | |
099e26bd | 1440 | |
5eb91c98 | 1441 | ust_cmd->sock = sock; |
099e26bd | 1442 | |
5eb91c98 DG |
1443 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1444 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1445 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1446 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1447 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1448 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1449 | |
5eb91c98 DG |
1450 | /* |
1451 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1452 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1453 | */ |
1454 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1455 | ||
1456 | /* | |
1457 | * Wake the registration queue futex. Implicit memory | |
1458 | * barrier with the exchange in cds_wfq_enqueue. | |
1459 | */ | |
1460 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1461 | } | |
1462 | } | |
90014c57 | 1463 | } |
1d4b027a DG |
1464 | } |
1465 | ||
1466 | error: | |
0fdd1e2c DG |
1467 | /* Notify that the registration thread is gone */ |
1468 | notify_ust_apps(0); | |
1469 | ||
a4b35e07 | 1470 | if (apps_sock >= 0) { |
76d7553f MD |
1471 | ret = close(apps_sock); |
1472 | if (ret) { | |
1473 | PERROR("close"); | |
1474 | } | |
a4b35e07 | 1475 | } |
46c3f085 | 1476 | if (sock >= 0) { |
76d7553f MD |
1477 | ret = close(sock); |
1478 | if (ret) { | |
1479 | PERROR("close"); | |
1480 | } | |
a4b35e07 | 1481 | } |
273ea72c | 1482 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1483 | |
76d7553f | 1484 | error_poll_add: |
5eb91c98 | 1485 | lttng_poll_clean(&events); |
76d7553f MD |
1486 | error_listen: |
1487 | error_create_poll: | |
1488 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1489 | |
1d4b027a DG |
1490 | return NULL; |
1491 | } | |
1492 | ||
8c0faa1d | 1493 | /* |
3bd1e081 | 1494 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1495 | * exec or it will fails. |
8c0faa1d | 1496 | */ |
3bd1e081 | 1497 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1498 | { |
1499 | int ret; | |
ee0b0061 DG |
1500 | struct timespec timeout; |
1501 | ||
1502 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1503 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1504 | |
1505 | /* Setup semaphore */ | |
3bd1e081 | 1506 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1507 | if (ret < 0) { |
3bd1e081 | 1508 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1509 | goto error; |
1510 | } | |
8c0faa1d | 1511 | |
3bd1e081 MD |
1512 | ret = pthread_create(&consumer_data->thread, NULL, |
1513 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1514 | if (ret != 0) { |
3bd1e081 | 1515 | PERROR("pthread_create consumer"); |
ee0b0061 | 1516 | ret = -1; |
8c0faa1d DG |
1517 | goto error; |
1518 | } | |
1519 | ||
ee0b0061 DG |
1520 | /* Get time for sem_timedwait absolute timeout */ |
1521 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1522 | if (ret < 0) { | |
3bd1e081 | 1523 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1524 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1525 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1526 | } else { |
1527 | /* Normal timeout if the gettime was successful */ | |
1528 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1529 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1530 | } |
8c0faa1d | 1531 | |
ee0b0061 DG |
1532 | if (ret < 0) { |
1533 | if (errno == ETIMEDOUT) { | |
1534 | /* | |
1535 | * Call has timed out so we kill the kconsumerd_thread and return | |
1536 | * an error. | |
1537 | */ | |
3bd1e081 MD |
1538 | ERR("The consumer thread was never ready. Killing it"); |
1539 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1540 | if (ret < 0) { |
3bd1e081 | 1541 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1542 | } |
1543 | } else { | |
3bd1e081 | 1544 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1545 | } |
1546 | goto error; | |
1547 | } | |
1548 | ||
3bd1e081 MD |
1549 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1550 | if (consumer_data->pid == 0) { | |
712ea556 | 1551 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1552 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1553 | goto error; |
1554 | } | |
3bd1e081 | 1555 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1556 | |
8c0faa1d DG |
1557 | return 0; |
1558 | ||
1559 | error: | |
1560 | return ret; | |
1561 | } | |
1562 | ||
d9800920 | 1563 | /* |
3bd1e081 | 1564 | * Join consumer thread |
d9800920 | 1565 | */ |
3bd1e081 | 1566 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1567 | { |
1568 | void *status; | |
1569 | int ret; | |
1570 | ||
3bd1e081 MD |
1571 | if (consumer_data->pid != 0) { |
1572 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1573 | if (ret) { |
3bd1e081 | 1574 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1575 | return ret; |
1576 | } | |
3bd1e081 | 1577 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1578 | } else { |
1579 | return 0; | |
1580 | } | |
1581 | } | |
1582 | ||
8c0faa1d | 1583 | /* |
3bd1e081 | 1584 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1585 | * |
d063d709 | 1586 | * Return pid if successful else -1. |
8c0faa1d | 1587 | */ |
3bd1e081 | 1588 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1589 | { |
1590 | int ret; | |
1591 | pid_t pid; | |
94c55f17 | 1592 | const char *consumer_to_use; |
53086306 | 1593 | const char *verbosity; |
94c55f17 | 1594 | struct stat st; |
8c0faa1d | 1595 | |
3bd1e081 | 1596 | DBG("Spawning consumerd"); |
c49dc785 | 1597 | |
8c0faa1d DG |
1598 | pid = fork(); |
1599 | if (pid == 0) { | |
1600 | /* | |
3bd1e081 | 1601 | * Exec consumerd. |
8c0faa1d | 1602 | */ |
daee5345 | 1603 | if (opt_verbose_consumer) { |
53086306 DG |
1604 | verbosity = "--verbose"; |
1605 | } else { | |
1606 | verbosity = "--quiet"; | |
1607 | } | |
3bd1e081 MD |
1608 | switch (consumer_data->type) { |
1609 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1610 | /* |
c7704d57 DG |
1611 | * Find out which consumerd to execute. We will first try the |
1612 | * 64-bit path, then the sessiond's installation directory, and | |
1613 | * fallback on the 32-bit one, | |
94c55f17 | 1614 | */ |
63a799e8 AM |
1615 | DBG3("Looking for a kernel consumer at these locations:"); |
1616 | DBG3(" 1) %s", consumerd64_bin); | |
1617 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1618 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1619 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1620 | DBG3("Found location #1"); |
94c55f17 | 1621 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1622 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1623 | DBG3("Found location #2"); |
94c55f17 | 1624 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1625 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1626 | DBG3("Found location #3"); |
eb1e0bd4 | 1627 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1628 | } else { |
63a799e8 | 1629 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1630 | break; |
1631 | } | |
1632 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1633 | execl(consumer_to_use, | |
1634 | "lttng-consumerd", verbosity, "-k", | |
1635 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1636 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1637 | NULL); | |
3bd1e081 | 1638 | break; |
7753dea8 MD |
1639 | case LTTNG_CONSUMER64_UST: |
1640 | { | |
b1e0b6b6 | 1641 | char *tmpnew = NULL; |
8f4905da MD |
1642 | |
1643 | if (consumerd64_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(consumerd64_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, consumerd64_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 | } | |
94c55f17 | 1670 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1671 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1672 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1673 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1674 | NULL); | |
8f4905da MD |
1675 | if (consumerd64_libdir[0] != '\0') { |
1676 | free(tmpnew); | |
1677 | } | |
1678 | if (ret) { | |
1679 | goto error; | |
1680 | } | |
3bd1e081 | 1681 | break; |
7753dea8 MD |
1682 | } |
1683 | case LTTNG_CONSUMER32_UST: | |
1684 | { | |
937dde8e | 1685 | char *tmpnew = NULL; |
8f4905da MD |
1686 | |
1687 | if (consumerd32_libdir[0] != '\0') { | |
1688 | char *tmp; | |
1689 | size_t tmplen; | |
1690 | ||
1691 | tmp = getenv("LD_LIBRARY_PATH"); | |
1692 | if (!tmp) { | |
1693 | tmp = ""; | |
1694 | } | |
1695 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1696 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1697 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1698 | if (!tmpnew) { | |
1699 | ret = -ENOMEM; | |
1700 | goto error; | |
1701 | } | |
1702 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1703 | strcat(tmpnew, consumerd32_libdir); | |
1704 | if (tmp[0] != '\0') { | |
1705 | strcat(tmpnew, ":"); | |
1706 | strcat(tmpnew, tmp); | |
1707 | } | |
1708 | ret = putenv(tmpnew); | |
1709 | if (ret) { | |
1710 | ret = -errno; | |
1711 | goto error; | |
1712 | } | |
1713 | } | |
94c55f17 | 1714 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1715 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1716 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1717 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1718 | NULL); | |
8f4905da MD |
1719 | if (consumerd32_libdir[0] != '\0') { |
1720 | free(tmpnew); | |
1721 | } | |
1722 | if (ret) { | |
1723 | goto error; | |
1724 | } | |
7753dea8 MD |
1725 | break; |
1726 | } | |
3bd1e081 | 1727 | default: |
76d7553f | 1728 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1729 | exit(EXIT_FAILURE); |
1730 | } | |
8c0faa1d | 1731 | if (errno != 0) { |
76d7553f | 1732 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1733 | } |
1734 | exit(EXIT_FAILURE); | |
1735 | } else if (pid > 0) { | |
1736 | ret = pid; | |
8c0faa1d | 1737 | } else { |
76d7553f | 1738 | PERROR("start consumer fork"); |
8c0faa1d | 1739 | ret = -errno; |
8c0faa1d | 1740 | } |
8f4905da | 1741 | error: |
8c0faa1d DG |
1742 | return ret; |
1743 | } | |
1744 | ||
693bd40b | 1745 | /* |
3bd1e081 | 1746 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1747 | */ |
3bd1e081 | 1748 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1749 | { |
1750 | int ret; | |
1751 | ||
3bd1e081 MD |
1752 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1753 | if (consumer_data->pid != 0) { | |
1754 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1755 | goto end; |
1756 | } | |
693bd40b | 1757 | |
3bd1e081 | 1758 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1759 | if (ret < 0) { |
3bd1e081 MD |
1760 | ERR("Spawning consumerd failed"); |
1761 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1762 | goto error; |
693bd40b | 1763 | } |
c49dc785 | 1764 | |
3bd1e081 MD |
1765 | /* Setting up the consumer_data pid */ |
1766 | consumer_data->pid = ret; | |
48842b30 | 1767 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1768 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1769 | |
3bd1e081 MD |
1770 | DBG2("Spawning consumer control thread"); |
1771 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1772 | if (ret < 0) { |
3bd1e081 | 1773 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1774 | goto error; |
1775 | } | |
1776 | ||
c49dc785 | 1777 | end: |
693bd40b DG |
1778 | return 0; |
1779 | ||
1780 | error: | |
1781 | return ret; | |
1782 | } | |
1783 | ||
b73401da | 1784 | /* |
096102bd | 1785 | * Check version of the lttng-modules. |
b73401da | 1786 | */ |
096102bd | 1787 | static int validate_lttng_modules_version(void) |
b73401da | 1788 | { |
096102bd | 1789 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1790 | } |
1791 | ||
b73401da | 1792 | /* |
096102bd | 1793 | * Setup necessary data for kernel tracer action. |
b73401da | 1794 | */ |
096102bd | 1795 | static int init_kernel_tracer(void) |
b73401da DG |
1796 | { |
1797 | int ret; | |
b73401da | 1798 | |
096102bd DG |
1799 | /* Modprobe lttng kernel modules */ |
1800 | ret = modprobe_lttng_control(); | |
b73401da | 1801 | if (ret < 0) { |
b73401da DG |
1802 | goto error; |
1803 | } | |
1804 | ||
096102bd DG |
1805 | /* Open debugfs lttng */ |
1806 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1807 | if (kernel_tracer_fd < 0) { | |
1808 | DBG("Failed to open %s", module_proc_lttng); | |
1809 | ret = -1; | |
1810 | goto error_open; | |
b73401da DG |
1811 | } |
1812 | ||
096102bd DG |
1813 | /* Validate kernel version */ |
1814 | ret = validate_lttng_modules_version(); | |
b73401da | 1815 | if (ret < 0) { |
096102bd | 1816 | goto error_version; |
b73401da DG |
1817 | } |
1818 | ||
096102bd | 1819 | ret = modprobe_lttng_data(); |
b73401da | 1820 | if (ret < 0) { |
096102bd | 1821 | goto error_modules; |
8c0faa1d DG |
1822 | } |
1823 | ||
f3ed775e | 1824 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1825 | return 0; |
1826 | ||
1827 | error_version: | |
1828 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1829 | ret = close(kernel_tracer_fd); |
1830 | if (ret) { | |
1831 | PERROR("close"); | |
1832 | } | |
1833 | kernel_tracer_fd = -1; | |
096102bd DG |
1834 | return LTTCOMM_KERN_VERSION; |
1835 | ||
1836 | error_modules: | |
76d7553f MD |
1837 | ret = close(kernel_tracer_fd); |
1838 | if (ret) { | |
1839 | PERROR("close"); | |
1840 | } | |
096102bd DG |
1841 | |
1842 | error_open: | |
1843 | modprobe_remove_lttng_control(); | |
b73401da DG |
1844 | |
1845 | error: | |
b73401da | 1846 | WARN("No kernel tracer available"); |
a4b35e07 | 1847 | kernel_tracer_fd = -1; |
096102bd | 1848 | return LTTCOMM_KERN_NA; |
f3ed775e | 1849 | } |
33a2b854 | 1850 | |
f3ed775e | 1851 | /* |
54d01ffb | 1852 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1853 | */ |
54d01ffb | 1854 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1855 | { |
f40799e8 | 1856 | int ret = 0; |
8c0faa1d | 1857 | |
3bd1e081 | 1858 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1859 | /* |
54d01ffb DG |
1860 | * Assign default kernel consumer socket if no consumer assigned to the |
1861 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1862 | * an extra security check. | |
d9800920 DG |
1863 | */ |
1864 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1865 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1866 | } |
1867 | ||
2bdd86d4 | 1868 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1869 | if (ret < 0) { |
f3ed775e DG |
1870 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1871 | goto error; | |
1872 | } | |
1d4b027a | 1873 | |
3bd1e081 | 1874 | session->consumer_fds_sent = 1; |
f3ed775e | 1875 | } |
1d4b027a DG |
1876 | |
1877 | error: | |
1878 | return ret; | |
8c0faa1d DG |
1879 | } |
1880 | ||
0177d773 DG |
1881 | /* |
1882 | * Create an UST session and add it to the session ust list. | |
1883 | */ | |
44d3bd01 | 1884 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1885 | struct lttng_domain *domain) |
0177d773 | 1886 | { |
13384287 | 1887 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1888 | int ret; |
44d3bd01 DG |
1889 | |
1890 | switch (domain->type) { | |
48842b30 | 1891 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1892 | break; |
1893 | default: | |
13384287 | 1894 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1895 | goto error; |
1896 | } | |
0177d773 DG |
1897 | |
1898 | DBG("Creating UST session"); | |
1899 | ||
a991f516 | 1900 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1901 | if (lus == NULL) { |
44d3bd01 | 1902 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1903 | goto error; |
1904 | } | |
1905 | ||
e11d277b | 1906 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1907 | session->uid, session->gid); |
0177d773 DG |
1908 | if (ret < 0) { |
1909 | if (ret != -EEXIST) { | |
1910 | ERR("Trace directory creation error"); | |
44d3bd01 | 1911 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1912 | goto error; |
1913 | } | |
1914 | } | |
1915 | ||
f6a9efaa DG |
1916 | /* The domain type dictate different actions on session creation */ |
1917 | switch (domain->type) { | |
48842b30 DG |
1918 | case LTTNG_DOMAIN_UST: |
1919 | /* No ustctl for the global UST domain */ | |
1920 | break; | |
1921 | default: | |
36dc12cc | 1922 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1923 | goto error; |
0177d773 | 1924 | } |
6df2e2c9 MD |
1925 | lus->uid = session->uid; |
1926 | lus->gid = session->gid; | |
f6a9efaa | 1927 | session->ust_session = lus; |
44d3bd01 DG |
1928 | |
1929 | return LTTCOMM_OK; | |
0177d773 DG |
1930 | |
1931 | error: | |
1932 | free(lus); | |
1933 | return ret; | |
1934 | } | |
1935 | ||
333f285e | 1936 | /* |
d063d709 | 1937 | * Create a kernel tracer session then create the default channel. |
333f285e | 1938 | */ |
6df2e2c9 | 1939 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1940 | { |
f3ed775e | 1941 | int ret; |
f3ed775e DG |
1942 | |
1943 | DBG("Creating kernel session"); | |
1944 | ||
1945 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1946 | if (ret < 0) { | |
1947 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1948 | goto error; | |
333f285e DG |
1949 | } |
1950 | ||
d9800920 | 1951 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1952 | if (kconsumer_data.cmd_sock) { |
1953 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1954 | } |
1955 | ||
e11d277b | 1956 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1957 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1958 | if (ret < 0) { |
996b65c8 | 1959 | if (ret != -EEXIST) { |
7a485870 DG |
1960 | ERR("Trace directory creation error"); |
1961 | goto error; | |
1962 | } | |
1963 | } | |
6df2e2c9 MD |
1964 | session->kernel_session->uid = session->uid; |
1965 | session->kernel_session->gid = session->gid; | |
7a485870 | 1966 | |
f3ed775e DG |
1967 | error: |
1968 | return ret; | |
333f285e DG |
1969 | } |
1970 | ||
8e0af1b4 | 1971 | /* |
c7704d57 DG |
1972 | * Check if the UID or GID match the session. Root user has access to all |
1973 | * sessions. | |
8e0af1b4 | 1974 | */ |
c7704d57 | 1975 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1976 | { |
c7704d57 | 1977 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
1978 | return 0; |
1979 | } else { | |
1980 | return 1; | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1985 | { | |
1986 | unsigned int i = 0; | |
1987 | struct ltt_session *session; | |
1988 | ||
1989 | DBG("Counting number of available session for UID %d GID %d", | |
1990 | uid, gid); | |
1991 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1992 | /* | |
1993 | * Only list the sessions the user can control. | |
1994 | */ | |
1995 | if (!session_access_ok(session, uid, gid)) { | |
1996 | continue; | |
1997 | } | |
1998 | i++; | |
1999 | } | |
2000 | return i; | |
2001 | } | |
2002 | ||
6c9cc2ab DG |
2003 | /* |
2004 | * Using the session list, filled a lttng_session array to send back to the | |
2005 | * client for session listing. | |
2006 | * | |
2007 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 2008 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 2009 | */ |
c7704d57 DG |
2010 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
2011 | gid_t gid) | |
6c9cc2ab | 2012 | { |
8e0af1b4 | 2013 | unsigned int i = 0; |
6c9cc2ab DG |
2014 | struct ltt_session *session; |
2015 | ||
8e0af1b4 MD |
2016 | DBG("Getting all available session for UID %d GID %d", |
2017 | uid, gid); | |
6c9cc2ab DG |
2018 | /* |
2019 | * Iterate over session list and append data after the control struct in | |
2020 | * the buffer. | |
2021 | */ | |
2022 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
2023 | /* |
2024 | * Only list the sessions the user can control. | |
2025 | */ | |
2026 | if (!session_access_ok(session, uid, gid)) { | |
2027 | continue; | |
2028 | } | |
6c9cc2ab | 2029 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 2030 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 2031 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 2032 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2033 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2034 | i++; |
2035 | } | |
2036 | } | |
2037 | ||
9f19cc17 DG |
2038 | /* |
2039 | * Fill lttng_channel array of all channels. | |
2040 | */ | |
b551a063 | 2041 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2042 | struct lttng_channel *channels) |
2043 | { | |
2044 | int i = 0; | |
2045 | struct ltt_kernel_channel *kchan; | |
2046 | ||
2047 | DBG("Listing channels for session %s", session->name); | |
2048 | ||
b551a063 DG |
2049 | switch (domain) { |
2050 | case LTTNG_DOMAIN_KERNEL: | |
2051 | /* Kernel channels */ | |
2052 | if (session->kernel_session != NULL) { | |
2053 | cds_list_for_each_entry(kchan, | |
2054 | &session->kernel_session->channel_list.head, list) { | |
2055 | /* Copy lttng_channel struct to array */ | |
2056 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2057 | channels[i].enabled = kchan->enabled; | |
2058 | i++; | |
2059 | } | |
2060 | } | |
2061 | break; | |
2062 | case LTTNG_DOMAIN_UST: | |
2063 | { | |
bec39940 | 2064 | struct lttng_ht_iter iter; |
b551a063 DG |
2065 | struct ltt_ust_channel *uchan; |
2066 | ||
bec39940 DG |
2067 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
2068 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
2069 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
2070 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2071 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2072 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2073 | channels[i].attr.switch_timer_interval = | |
2074 | uchan->attr.switch_timer_interval; | |
2075 | channels[i].attr.read_timer_interval = | |
2076 | uchan->attr.read_timer_interval; | |
aea829b3 | 2077 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2078 | switch (uchan->attr.output) { |
2079 | case LTTNG_UST_MMAP: | |
2080 | default: | |
2081 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2082 | break; | |
2083 | } | |
befe0905 | 2084 | i++; |
b551a063 DG |
2085 | } |
2086 | break; | |
2087 | } | |
2088 | default: | |
2089 | break; | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | /* | |
2094 | * Create a list of ust global domain events. | |
2095 | */ | |
2096 | static int list_lttng_ust_global_events(char *channel_name, | |
2097 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2098 | { | |
2099 | int i = 0, ret = 0; | |
2100 | unsigned int nb_event = 0; | |
bec39940 DG |
2101 | struct lttng_ht_iter iter; |
2102 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2103 | struct ltt_ust_channel *uchan; |
2104 | struct ltt_ust_event *uevent; | |
2105 | struct lttng_event *tmp; | |
2106 | ||
2107 | DBG("Listing UST global events for channel %s", channel_name); | |
2108 | ||
2109 | rcu_read_lock(); | |
2110 | ||
bec39940 DG |
2111 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2112 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2113 | if (node == NULL) { |
2114 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2115 | goto error; | |
b551a063 DG |
2116 | } |
2117 | ||
bec39940 | 2118 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2119 | |
bec39940 | 2120 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2121 | |
b551a063 DG |
2122 | if (nb_event == 0) { |
2123 | ret = nb_event; | |
2124 | goto error; | |
2125 | } | |
2126 | ||
2127 | DBG3("Listing UST global %d events", nb_event); | |
2128 | ||
2129 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2130 | if (tmp == NULL) { | |
2131 | ret = -LTTCOMM_FATAL; | |
2132 | goto error; | |
2133 | } | |
2134 | ||
bec39940 | 2135 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2136 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2137 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2138 | tmp[i].enabled = uevent->enabled; | |
2139 | switch (uevent->attr.instrumentation) { | |
2140 | case LTTNG_UST_TRACEPOINT: | |
2141 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2142 | break; | |
2143 | case LTTNG_UST_PROBE: | |
2144 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2145 | break; | |
2146 | case LTTNG_UST_FUNCTION: | |
2147 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2148 | break; | |
0cda4f28 | 2149 | } |
8005f29a | 2150 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2151 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2152 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2153 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2154 | break; |
8005f29a | 2155 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2156 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2157 | break; |
2158 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2159 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2160 | break; |
9f19cc17 | 2161 | } |
d7b75b30 | 2162 | i++; |
9f19cc17 DG |
2163 | } |
2164 | ||
b551a063 DG |
2165 | ret = nb_event; |
2166 | *events = tmp; | |
2167 | ||
2168 | error: | |
2169 | rcu_read_unlock(); | |
2170 | return ret; | |
9f19cc17 DG |
2171 | } |
2172 | ||
2173 | /* | |
b551a063 | 2174 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2175 | */ |
b551a063 DG |
2176 | static int list_lttng_kernel_events(char *channel_name, |
2177 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2178 | { |
b551a063 DG |
2179 | int i = 0, ret; |
2180 | unsigned int nb_event; | |
9f19cc17 | 2181 | struct ltt_kernel_event *event; |
b551a063 DG |
2182 | struct ltt_kernel_channel *kchan; |
2183 | ||
2184 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2185 | if (kchan == NULL) { | |
2186 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2187 | goto error; | |
2188 | } | |
2189 | ||
2190 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2191 | |
2192 | DBG("Listing events for channel %s", kchan->channel->name); | |
2193 | ||
b551a063 DG |
2194 | if (nb_event == 0) { |
2195 | ret = nb_event; | |
2196 | goto error; | |
2197 | } | |
2198 | ||
2199 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2200 | if (*events == NULL) { | |
2201 | ret = LTTCOMM_FATAL; | |
2202 | goto error; | |
2203 | } | |
2204 | ||
9f19cc17 DG |
2205 | /* Kernel channels */ |
2206 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2207 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2208 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2209 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2210 | switch (event->event->instrumentation) { |
2211 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2212 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2213 | break; |
2214 | case LTTNG_KERNEL_KPROBE: | |
2215 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2216 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2217 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2218 | sizeof(struct lttng_kernel_kprobe)); |
2219 | break; | |
2220 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2221 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2222 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2223 | sizeof(struct lttng_kernel_function)); |
2224 | break; | |
0133c199 | 2225 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2226 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2227 | break; |
a54bd42d | 2228 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2229 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2230 | break; |
7a3d1328 MD |
2231 | case LTTNG_KERNEL_ALL: |
2232 | assert(0); | |
2233 | break; | |
9f19cc17 DG |
2234 | } |
2235 | i++; | |
2236 | } | |
b551a063 DG |
2237 | |
2238 | return nb_event; | |
2239 | ||
2240 | error: | |
2241 | return ret; | |
9f19cc17 DG |
2242 | } |
2243 | ||
fac6795d | 2244 | /* |
54d01ffb | 2245 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2246 | */ |
54d01ffb DG |
2247 | static int cmd_disable_channel(struct ltt_session *session, |
2248 | int domain, char *channel_name) | |
fac6795d | 2249 | { |
54d01ffb | 2250 | int ret; |
78f0bacd DG |
2251 | struct ltt_ust_session *usess; |
2252 | ||
2253 | usess = session->ust_session; | |
379473d2 | 2254 | |
54d01ffb | 2255 | switch (domain) { |
78f0bacd DG |
2256 | case LTTNG_DOMAIN_KERNEL: |
2257 | { | |
2258 | ret = channel_kernel_disable(session->kernel_session, | |
2259 | channel_name); | |
2260 | if (ret != LTTCOMM_OK) { | |
2261 | goto error; | |
2262 | } | |
54d01ffb | 2263 | |
78f0bacd DG |
2264 | kernel_wait_quiescent(kernel_tracer_fd); |
2265 | break; | |
2266 | } | |
2267 | case LTTNG_DOMAIN_UST: | |
2268 | { | |
2269 | struct ltt_ust_channel *uchan; | |
bec39940 | 2270 | struct lttng_ht *chan_ht; |
78f0bacd | 2271 | |
7885e399 DG |
2272 | chan_ht = usess->domain_global.channels; |
2273 | ||
2274 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2275 | if (uchan == NULL) { |
2276 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2277 | goto error; |
78f0bacd DG |
2278 | } |
2279 | ||
7885e399 DG |
2280 | ret = channel_ust_disable(usess, domain, uchan); |
2281 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2282 | goto error; |
2283 | } | |
78f0bacd DG |
2284 | break; |
2285 | } | |
d78d6610 | 2286 | #if 0 |
78f0bacd DG |
2287 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2288 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2289 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2290 | #endif |
78f0bacd DG |
2291 | default: |
2292 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2293 | goto error; | |
20fe2104 DG |
2294 | } |
2295 | ||
54d01ffb | 2296 | ret = LTTCOMM_OK; |
d65106b1 | 2297 | |
54d01ffb DG |
2298 | error: |
2299 | return ret; | |
2300 | } | |
2301 | ||
2302 | /* | |
2303 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2304 | */ | |
44d3bd01 | 2305 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2306 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2307 | { |
2308 | int ret; | |
f6a9efaa | 2309 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2310 | struct lttng_ht *chan_ht; |
f6a9efaa | 2311 | |
5d56b5aa | 2312 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2313 | |
aea829b3 | 2314 | switch (domain) { |
44d3bd01 DG |
2315 | case LTTNG_DOMAIN_KERNEL: |
2316 | { | |
2317 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2318 | |
44d3bd01 DG |
2319 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2320 | session->kernel_session); | |
2321 | if (kchan == NULL) { | |
2322 | ret = channel_kernel_create(session->kernel_session, | |
2323 | attr, kernel_poll_pipe[1]); | |
2324 | } else { | |
2325 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2326 | } | |
2327 | ||
2328 | if (ret != LTTCOMM_OK) { | |
2329 | goto error; | |
2330 | } | |
2331 | ||
2332 | kernel_wait_quiescent(kernel_tracer_fd); | |
2333 | break; | |
2334 | } | |
f6a9efaa DG |
2335 | case LTTNG_DOMAIN_UST: |
2336 | { | |
2337 | struct ltt_ust_channel *uchan; | |
2338 | ||
7885e399 | 2339 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2340 | |
7885e399 | 2341 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2342 | if (uchan == NULL) { |
7885e399 | 2343 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2344 | } else { |
7885e399 | 2345 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2346 | } |
f6a9efaa DG |
2347 | break; |
2348 | } | |
d78d6610 | 2349 | #if 0 |
78f0bacd DG |
2350 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2351 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2352 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2353 | #endif |
44d3bd01 DG |
2354 | default: |
2355 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2356 | goto error; | |
54d01ffb DG |
2357 | } |
2358 | ||
54d01ffb DG |
2359 | error: |
2360 | return ret; | |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2365 | */ | |
2366 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2367 | char *channel_name, char *event_name) | |
2368 | { | |
2369 | int ret; | |
54d01ffb DG |
2370 | |
2371 | switch (domain) { | |
2372 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2373 | { |
2374 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2375 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2376 | |
b0a40d28 DG |
2377 | ksess = session->kernel_session; |
2378 | ||
2379 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2380 | if (kchan == NULL) { |
2381 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2382 | goto error; | |
d65106b1 DG |
2383 | } |
2384 | ||
b0a40d28 | 2385 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2386 | if (ret != LTTCOMM_OK) { |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2391 | break; |
2bdd86d4 MD |
2392 | } |
2393 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2394 | { |
b0a40d28 | 2395 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2396 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2397 | |
2398 | usess = session->ust_session; | |
2399 | ||
2400 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2401 | channel_name); | |
2402 | if (uchan == NULL) { | |
2403 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2404 | goto error; | |
2405 | } | |
2406 | ||
7f79d3a1 DG |
2407 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2408 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2409 | goto error; |
2410 | } | |
2411 | ||
7f79d3a1 | 2412 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2413 | channel_name); |
b0a40d28 DG |
2414 | break; |
2415 | } | |
d78d6610 | 2416 | #if 0 |
2bdd86d4 MD |
2417 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2418 | case LTTNG_DOMAIN_UST_PID: | |
2419 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2420 | #endif |
54d01ffb | 2421 | default: |
1ab1ea0b | 2422 | ret = LTTCOMM_UND; |
54d01ffb | 2423 | goto error; |
d65106b1 | 2424 | } |
26cc6b4e | 2425 | |
54d01ffb DG |
2426 | ret = LTTCOMM_OK; |
2427 | ||
2428 | error: | |
2429 | return ret; | |
2430 | } | |
2431 | ||
2432 | /* | |
2433 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2434 | */ | |
2435 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2436 | char *channel_name) | |
2437 | { | |
2438 | int ret; | |
54d01ffb DG |
2439 | |
2440 | switch (domain) { | |
2441 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2442 | { |
2443 | struct ltt_kernel_session *ksess; | |
2444 | struct ltt_kernel_channel *kchan; | |
2445 | ||
2446 | ksess = session->kernel_session; | |
2447 | ||
2448 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2449 | if (kchan == NULL) { |
2450 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2451 | goto error; | |
26cc6b4e DG |
2452 | } |
2453 | ||
9730260e | 2454 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2455 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2456 | goto error; |
26cc6b4e DG |
2457 | } |
2458 | ||
54d01ffb | 2459 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2460 | break; |
9730260e DG |
2461 | } |
2462 | case LTTNG_DOMAIN_UST: | |
2463 | { | |
2464 | struct ltt_ust_session *usess; | |
2465 | struct ltt_ust_channel *uchan; | |
2466 | ||
2467 | usess = session->ust_session; | |
2468 | ||
2469 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2470 | channel_name); | |
2471 | if (uchan == NULL) { | |
2472 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2473 | goto error; | |
2474 | } | |
2475 | ||
7f79d3a1 DG |
2476 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2477 | if (ret != 0) { | |
9730260e DG |
2478 | goto error; |
2479 | } | |
2480 | ||
7f79d3a1 | 2481 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2482 | |
2483 | break; | |
2484 | } | |
d78d6610 | 2485 | #if 0 |
9730260e DG |
2486 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2487 | case LTTNG_DOMAIN_UST_PID: | |
2488 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2489 | #endif |
54d01ffb | 2490 | default: |
1ab1ea0b | 2491 | ret = LTTCOMM_UND; |
54d01ffb | 2492 | goto error; |
26cc6b4e | 2493 | } |
e953ef25 | 2494 | |
54d01ffb | 2495 | ret = LTTCOMM_OK; |
e953ef25 | 2496 | |
54d01ffb DG |
2497 | error: |
2498 | return ret; | |
2499 | } | |
f5177a38 | 2500 | |
54d01ffb DG |
2501 | /* |
2502 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2503 | */ | |
2504 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2505 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2506 | { | |
2507 | int ret; | |
f5177a38 | 2508 | |
54d01ffb DG |
2509 | switch (domain) { |
2510 | case LTTNG_DOMAIN_KERNEL: | |
2511 | /* Add kernel context to kernel tracer */ | |
2512 | ret = context_kernel_add(session->kernel_session, ctx, | |
2513 | event_name, channel_name); | |
2514 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2515 | goto error; |
e953ef25 | 2516 | } |
2bdd86d4 MD |
2517 | break; |
2518 | case LTTNG_DOMAIN_UST: | |
2519 | { | |
55cc08a6 | 2520 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2521 | |
55cc08a6 DG |
2522 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2523 | if (ret != LTTCOMM_OK) { | |
2524 | goto error; | |
2bdd86d4 | 2525 | } |
e953ef25 | 2526 | break; |
2bdd86d4 | 2527 | } |
d78d6610 | 2528 | #if 0 |
55cc08a6 DG |
2529 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2530 | case LTTNG_DOMAIN_UST_PID: | |
2531 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2532 | #endif |
54d01ffb | 2533 | default: |
1ab1ea0b | 2534 | ret = LTTCOMM_UND; |
54d01ffb | 2535 | goto error; |
e953ef25 | 2536 | } |
950131af | 2537 | |
54d01ffb | 2538 | ret = LTTCOMM_OK; |
950131af | 2539 | |
54d01ffb DG |
2540 | error: |
2541 | return ret; | |
2542 | } | |
2543 | ||
2544 | /* | |
2545 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2546 | */ | |
2547 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2548 | char *channel_name, struct lttng_event *event) | |
2549 | { | |
2550 | int ret; | |
f6cd6b0f | 2551 | struct lttng_channel *attr; |
48842b30 | 2552 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2553 | |
2554 | switch (domain) { | |
2555 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2556 | { |
2557 | struct ltt_kernel_channel *kchan; | |
2558 | ||
54d01ffb DG |
2559 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2560 | session->kernel_session); | |
2561 | if (kchan == NULL) { | |
f6cd6b0f DG |
2562 | attr = channel_new_default_attr(domain); |
2563 | if (attr == NULL) { | |
2564 | ret = LTTCOMM_FATAL; | |
2565 | goto error; | |
2566 | } | |
2567 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2568 | ||
54d01ffb | 2569 | /* This call will notify the kernel thread */ |
44d3bd01 | 2570 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2571 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2572 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2573 | free(attr); |
f5177a38 DG |
2574 | goto error; |
2575 | } | |
ff4d74e6 | 2576 | free(attr); |
54d01ffb | 2577 | } |
950131af | 2578 | |
54d01ffb DG |
2579 | /* Get the newly created kernel channel pointer */ |
2580 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2581 | session->kernel_session); | |
2582 | if (kchan == NULL) { | |
2583 | /* This sould not happen... */ | |
2584 | ret = LTTCOMM_FATAL; | |
2585 | goto error; | |
2586 | } | |
f5177a38 | 2587 | |
48842b30 DG |
2588 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2589 | event); | |
54d01ffb | 2590 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2591 | goto error; |
950131af DG |
2592 | } |
2593 | ||
54d01ffb | 2594 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2595 | break; |
2bdd86d4 MD |
2596 | } |
2597 | case LTTNG_DOMAIN_UST: | |
2598 | { | |
aea829b3 | 2599 | struct lttng_channel *attr; |
edb67388 | 2600 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2601 | |
edb67388 | 2602 | /* Get channel from global UST domain */ |
48842b30 DG |
2603 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2604 | channel_name); | |
2605 | if (uchan == NULL) { | |
aea829b3 DG |
2606 | /* Create default channel */ |
2607 | attr = channel_new_default_attr(domain); | |
2608 | if (attr == NULL) { | |
2609 | ret = LTTCOMM_FATAL; | |
2610 | goto error; | |
2611 | } | |
596219f7 | 2612 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2613 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2614 | |
7885e399 | 2615 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2616 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2617 | free(attr); |
aea829b3 DG |
2618 | goto error; |
2619 | } | |
aea829b3 DG |
2620 | free(attr); |
2621 | ||
2622 | /* Get the newly created channel reference back */ | |
2623 | uchan = trace_ust_find_channel_by_name( | |
2624 | usess->domain_global.channels, channel_name); | |
2625 | if (uchan == NULL) { | |
2626 | /* Something is really wrong */ | |
2627 | ret = LTTCOMM_FATAL; | |
2628 | goto error; | |
2629 | } | |
48842b30 | 2630 | } |
2bdd86d4 | 2631 | |
edb67388 | 2632 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2633 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2634 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2635 | goto error; |
2bdd86d4 MD |
2636 | } |
2637 | break; | |
2638 | } | |
d78d6610 | 2639 | #if 0 |
2bdd86d4 MD |
2640 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2641 | case LTTNG_DOMAIN_UST_PID: | |
2642 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2643 | #endif |
54d01ffb | 2644 | default: |
1ab1ea0b | 2645 | ret = LTTCOMM_UND; |
54d01ffb | 2646 | goto error; |
950131af | 2647 | } |
d36b8583 | 2648 | |
54d01ffb | 2649 | ret = LTTCOMM_OK; |
d36b8583 | 2650 | |
54d01ffb DG |
2651 | error: |
2652 | return ret; | |
2653 | } | |
7d29a247 | 2654 | |
54d01ffb DG |
2655 | /* |
2656 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2657 | */ | |
2658 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2659 | char *channel_name, int event_type) |
54d01ffb DG |
2660 | { |
2661 | int ret; | |
2662 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2663 | |
54d01ffb DG |
2664 | switch (domain) { |
2665 | case LTTNG_DOMAIN_KERNEL: | |
2666 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2667 | session->kernel_session); | |
2668 | if (kchan == NULL) { | |
2669 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2670 | ret = channel_kernel_create(session->kernel_session, NULL, |
2671 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2672 | if (ret != LTTCOMM_OK) { |
2673 | goto error; | |
d36b8583 | 2674 | } |
0d0c377a | 2675 | |
8f69e5eb DG |
2676 | /* Get the newly created kernel channel pointer */ |
2677 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2678 | session->kernel_session); | |
2679 | if (kchan == NULL) { | |
2680 | /* This sould not happen... */ | |
2681 | ret = LTTCOMM_FATAL; | |
2682 | goto error; | |
2683 | } | |
2684 | ||
54d01ffb | 2685 | } |
0fdd1e2c | 2686 | |
7a3d1328 | 2687 | switch (event_type) { |
76d45b40 | 2688 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2689 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2690 | kchan, kernel_tracer_fd); |
7a3d1328 | 2691 | break; |
76d45b40 | 2692 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2693 | /* |
7a3d1328 MD |
2694 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2695 | * events already registered to the channel. | |
8c9ae521 | 2696 | */ |
7a3d1328 MD |
2697 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2698 | kchan, kernel_tracer_fd); | |
2699 | break; | |
76d45b40 | 2700 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2701 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2702 | ret = event_kernel_enable_all(session->kernel_session, |
2703 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2704 | break; |
2705 | default: | |
2706 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2707 | goto error; | |
8c9ae521 | 2708 | } |
8f69e5eb DG |
2709 | |
2710 | /* Manage return value */ | |
54d01ffb | 2711 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2712 | goto error; |
d36b8583 DG |
2713 | } |
2714 | ||
54d01ffb | 2715 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2716 | break; |
76d45b40 DG |
2717 | case LTTNG_DOMAIN_UST: |
2718 | { | |
2719 | struct lttng_channel *attr; | |
2720 | struct ltt_ust_channel *uchan; | |
2721 | struct ltt_ust_session *usess = session->ust_session; | |
2722 | ||
2723 | /* Get channel from global UST domain */ | |
2724 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2725 | channel_name); | |
2726 | if (uchan == NULL) { | |
2727 | /* Create default channel */ | |
2728 | attr = channel_new_default_attr(domain); | |
2729 | if (attr == NULL) { | |
2730 | ret = LTTCOMM_FATAL; | |
2731 | goto error; | |
2732 | } | |
2733 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2734 | attr->name[NAME_MAX - 1] = '\0'; | |
2735 | ||
2736 | /* Use the internal command enable channel */ | |
7885e399 | 2737 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2738 | if (ret != LTTCOMM_OK) { |
2739 | free(attr); | |
2740 | goto error; | |
2741 | } | |
2742 | free(attr); | |
2743 | ||
2744 | /* Get the newly created channel reference back */ | |
2745 | uchan = trace_ust_find_channel_by_name( | |
2746 | usess->domain_global.channels, channel_name); | |
2747 | if (uchan == NULL) { | |
2748 | /* Something is really wrong */ | |
2749 | ret = LTTCOMM_FATAL; | |
2750 | goto error; | |
2751 | } | |
2752 | } | |
2753 | ||
2754 | /* At this point, the session and channel exist on the tracer */ | |
2755 | ||
2756 | switch (event_type) { | |
2757 | case LTTNG_EVENT_ALL: | |
2758 | case LTTNG_EVENT_TRACEPOINT: | |
2759 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2760 | if (ret != LTTCOMM_OK) { | |
2761 | goto error; | |
2762 | } | |
2763 | break; | |
2764 | default: | |
2765 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2766 | goto error; | |
2767 | } | |
2768 | ||
2769 | /* Manage return value */ | |
2770 | if (ret != LTTCOMM_OK) { | |
2771 | goto error; | |
2772 | } | |
2773 | ||
2774 | break; | |
2775 | } | |
d78d6610 | 2776 | #if 0 |
76d45b40 DG |
2777 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2778 | case LTTNG_DOMAIN_UST_PID: | |
2779 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2780 | #endif |
54d01ffb | 2781 | default: |
1ab1ea0b | 2782 | ret = LTTCOMM_UND; |
54d01ffb | 2783 | goto error; |
d36b8583 | 2784 | } |
f3ed775e | 2785 | |
54d01ffb DG |
2786 | ret = LTTCOMM_OK; |
2787 | ||
2788 | error: | |
2789 | return ret; | |
2790 | } | |
2791 | ||
2792 | /* | |
2793 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2794 | */ | |
2795 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2796 | { | |
2797 | int ret; | |
2798 | ssize_t nb_events = 0; | |
2799 | ||
2800 | switch (domain) { | |
2801 | case LTTNG_DOMAIN_KERNEL: | |
2802 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2803 | if (nb_events < 0) { | |
2804 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2805 | goto error; | |
894be886 | 2806 | } |
54d01ffb | 2807 | break; |
b551a063 DG |
2808 | case LTTNG_DOMAIN_UST: |
2809 | nb_events = ust_app_list_events(events); | |
2810 | if (nb_events < 0) { | |
2811 | ret = LTTCOMM_UST_LIST_FAIL; | |
2812 | goto error; | |
2813 | } | |
2814 | break; | |
54d01ffb | 2815 | default: |
1ab1ea0b | 2816 | ret = LTTCOMM_UND; |
54d01ffb DG |
2817 | goto error; |
2818 | } | |
894be886 | 2819 | |
54d01ffb | 2820 | return nb_events; |
7d29a247 | 2821 | |
54d01ffb DG |
2822 | error: |
2823 | /* Return negative value to differentiate return code */ | |
2824 | return -ret; | |
2825 | } | |
b389abbe | 2826 | |
54d01ffb DG |
2827 | /* |
2828 | * Command LTTNG_START_TRACE processed by the client thread. | |
2829 | */ | |
2830 | static int cmd_start_trace(struct ltt_session *session) | |
2831 | { | |
2832 | int ret; | |
54d01ffb | 2833 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2834 | struct ltt_ust_session *usess; |
b389abbe | 2835 | |
54d01ffb DG |
2836 | /* Short cut */ |
2837 | ksession = session->kernel_session; | |
b9d9b220 | 2838 | usess = session->ust_session; |
5eb91c98 | 2839 | |
b9ef1c83 DG |
2840 | if (session->enabled) { |
2841 | ret = LTTCOMM_UST_START_FAIL; | |
2842 | goto error; | |
2843 | } | |
2844 | ||
464dd62d MD |
2845 | session->enabled = 1; |
2846 | ||
54d01ffb DG |
2847 | /* Kernel tracing */ |
2848 | if (ksession != NULL) { | |
2bdd86d4 MD |
2849 | struct ltt_kernel_channel *kchan; |
2850 | ||
54d01ffb DG |
2851 | /* Open kernel metadata */ |
2852 | if (ksession->metadata == NULL) { | |
2853 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2854 | if (ret < 0) { | |
2855 | ret = LTTCOMM_KERN_META_FAIL; | |
2856 | goto error; | |
b389abbe | 2857 | } |
54d01ffb | 2858 | } |
7d29a247 | 2859 | |
54d01ffb DG |
2860 | /* Open kernel metadata stream */ |
2861 | if (ksession->metadata_stream_fd == 0) { | |
2862 | ret = kernel_open_metadata_stream(ksession); | |
2863 | if (ret < 0) { | |
2864 | ERR("Kernel create metadata stream failed"); | |
2865 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2866 | goto error; | |
2867 | } | |
2868 | } | |
2869 | ||
2870 | /* For each channel */ | |
2871 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2872 | if (kchan->stream_count == 0) { | |
2873 | ret = kernel_open_channel_stream(kchan); | |
2874 | if (ret < 0) { | |
2875 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2876 | goto error; |
2877 | } | |
54d01ffb DG |
2878 | /* Update the stream global counter */ |
2879 | ksession->stream_count_global += ret; | |
7d29a247 | 2880 | } |
54d01ffb DG |
2881 | } |
2882 | ||
2883 | /* Setup kernel consumer socket and send fds to it */ | |
2884 | ret = init_kernel_tracing(ksession); | |
2885 | if (ret < 0) { | |
2886 | ret = LTTCOMM_KERN_START_FAIL; | |
2887 | goto error; | |
2888 | } | |
2889 | ||
2890 | /* This start the kernel tracing */ | |
2891 | ret = kernel_start_session(ksession); | |
2892 | if (ret < 0) { | |
2893 | ret = LTTCOMM_KERN_START_FAIL; | |
2894 | goto error; | |
2895 | } | |
2896 | ||
2897 | /* Quiescent wait after starting trace */ | |
2898 | kernel_wait_quiescent(kernel_tracer_fd); | |
2899 | } | |
2900 | ||
36dc12cc | 2901 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2902 | if (usess) { |
2903 | usess->start_trace = 1; | |
36dc12cc | 2904 | |
b9d9b220 DG |
2905 | ret = ust_app_start_trace_all(usess); |
2906 | if (ret < 0) { | |
2907 | ret = LTTCOMM_UST_START_FAIL; | |
2908 | goto error; | |
2909 | } | |
2bdd86d4 | 2910 | } |
54d01ffb DG |
2911 | |
2912 | ret = LTTCOMM_OK; | |
2913 | ||
2914 | error: | |
2915 | return ret; | |
2916 | } | |
2917 | ||
2918 | /* | |
2919 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2920 | */ | |
2921 | static int cmd_stop_trace(struct ltt_session *session) | |
2922 | { | |
2923 | int ret; | |
2924 | struct ltt_kernel_channel *kchan; | |
2925 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2926 | struct ltt_ust_session *usess; |
54d01ffb DG |
2927 | |
2928 | /* Short cut */ | |
2929 | ksession = session->kernel_session; | |
8be98f9a | 2930 | usess = session->ust_session; |
54d01ffb | 2931 | |
b9ef1c83 | 2932 | if (!session->enabled) { |
190df5ac | 2933 | ret = LTTCOMM_UST_STOP_FAIL; |
b9ef1c83 DG |
2934 | goto error; |
2935 | } | |
2936 | ||
464dd62d MD |
2937 | session->enabled = 0; |
2938 | ||
54d01ffb DG |
2939 | /* Kernel tracer */ |
2940 | if (ksession != NULL) { | |
2941 | DBG("Stop kernel tracing"); | |
2942 | ||
2943 | /* Flush all buffers before stopping */ | |
2944 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2945 | if (ret < 0) { | |
2946 | ERR("Kernel metadata flush failed"); | |
2947 | } | |
f34daff7 | 2948 | |
54d01ffb DG |
2949 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2950 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2951 | if (ret < 0) { |
54d01ffb | 2952 | ERR("Kernel flush buffer error"); |
7d29a247 | 2953 | } |
54d01ffb | 2954 | } |
19e70852 | 2955 | |
54d01ffb DG |
2956 | ret = kernel_stop_session(ksession); |
2957 | if (ret < 0) { | |
2958 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2959 | goto error; |
f3ed775e | 2960 | } |
54d01ffb DG |
2961 | |
2962 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2963 | } |
54d01ffb | 2964 | |
8be98f9a MD |
2965 | if (usess) { |
2966 | usess->start_trace = 0; | |
2bdd86d4 | 2967 | |
8be98f9a | 2968 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2969 | if (ret < 0) { |
190df5ac | 2970 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2971 | goto error; |
2972 | } | |
2bdd86d4 | 2973 | } |
54d01ffb DG |
2974 | |
2975 | ret = LTTCOMM_OK; | |
2976 | ||
2977 | error: | |
2978 | return ret; | |
2979 | } | |
2980 | ||
2981 | /* | |
2982 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2983 | */ | |
730389d9 | 2984 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
2985 | { |
2986 | int ret; | |
2987 | ||
730389d9 DG |
2988 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
2989 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
2990 | if (ret != LTTCOMM_OK) { |
2991 | goto error; | |
2992 | } | |
2993 | ||
2994 | ret = LTTCOMM_OK; | |
2995 | ||
2996 | error: | |
2997 | return ret; | |
2998 | } | |
2999 | ||
3000 | /* | |
3001 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3002 | */ | |
3003 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3004 | { | |
3005 | int ret; | |
3006 | ||
3007 | /* Clean kernel session teardown */ | |
3008 | teardown_kernel_session(session); | |
84cd17c6 MD |
3009 | /* UST session teardown */ |
3010 | teardown_ust_session(session); | |
54d01ffb DG |
3011 | |
3012 | /* | |
3013 | * Must notify the kernel thread here to update it's poll setin order | |
3014 | * to remove the channel(s)' fd just destroyed. | |
3015 | */ | |
3016 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3017 | if (ret < 0) { | |
76d7553f | 3018 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
3019 | } |
3020 | ||
271933a4 | 3021 | ret = session_destroy(session); |
54d01ffb DG |
3022 | |
3023 | return ret; | |
3024 | } | |
3025 | ||
3026 | /* | |
3027 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3028 | */ | |
3029 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3030 | { | |
3031 | int ret; | |
3032 | ||
3033 | switch (domain) { | |
3034 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3035 | { |
54d01ffb | 3036 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3037 | |
54d01ffb DG |
3038 | kcalibrate.type = calibrate->type; |
3039 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3040 | if (ret < 0) { |
54d01ffb DG |
3041 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3042 | goto error; | |
33a2b854 | 3043 | } |
54d01ffb DG |
3044 | break; |
3045 | } | |
4466912f DG |
3046 | case LTTNG_DOMAIN_UST: |
3047 | { | |
3048 | struct lttng_ust_calibrate ucalibrate; | |
3049 | ||
3050 | ucalibrate.type = calibrate->type; | |
3051 | ret = ust_app_calibrate_glb(&ucalibrate); | |
3052 | if (ret < 0) { | |
3053 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3054 | goto error; | |
3055 | } | |
3056 | break; | |
3057 | } | |
54d01ffb | 3058 | default: |
1ab1ea0b | 3059 | ret = LTTCOMM_UND; |
54d01ffb DG |
3060 | goto error; |
3061 | } | |
33a2b854 | 3062 | |
54d01ffb | 3063 | ret = LTTCOMM_OK; |
33a2b854 | 3064 | |
54d01ffb DG |
3065 | error: |
3066 | return ret; | |
3067 | } | |
7d29a247 | 3068 | |
54d01ffb DG |
3069 | /* |
3070 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3071 | */ | |
3072 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3073 | char *sock_path) | |
3074 | { | |
3075 | int ret, sock; | |
b389abbe | 3076 | |
54d01ffb DG |
3077 | switch (domain) { |
3078 | case LTTNG_DOMAIN_KERNEL: | |
3079 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3080 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3081 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3082 | goto error; | |
3083 | } | |
3084 | ||
3085 | sock = lttcomm_connect_unix_sock(sock_path); | |
3086 | if (sock < 0) { | |
3087 | ret = LTTCOMM_CONNECT_FAIL; | |
3088 | goto error; | |
3089 | } | |
3090 | ||
3091 | session->kernel_session->consumer_fd = sock; | |
3092 | break; | |
3093 | default: | |
3094 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3095 | ret = LTTCOMM_UND; |
54d01ffb DG |
3096 | goto error; |
3097 | } | |
3098 | ||
3099 | ret = LTTCOMM_OK; | |
3100 | ||
3101 | error: | |
3102 | return ret; | |
3103 | } | |
3104 | ||
3105 | /* | |
3106 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3107 | */ | |
3108 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3109 | struct lttng_domain **domains) | |
3110 | { | |
b551a063 | 3111 | int ret, index = 0; |
54d01ffb DG |
3112 | ssize_t nb_dom = 0; |
3113 | ||
3114 | if (session->kernel_session != NULL) { | |
b551a063 | 3115 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3116 | nb_dom++; |
3117 | } | |
3118 | ||
b551a063 DG |
3119 | if (session->ust_session != NULL) { |
3120 | DBG3("Listing domains found UST global domain"); | |
3121 | nb_dom++; | |
3122 | } | |
54d01ffb | 3123 | |
b551a063 | 3124 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3125 | if (*domains == NULL) { |
3126 | ret = -LTTCOMM_FATAL; | |
3127 | goto error; | |
3128 | } | |
3129 | ||
b551a063 DG |
3130 | if (session->kernel_session != NULL) { |
3131 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3132 | index++; | |
3133 | } | |
3134 | ||
3135 | if (session->ust_session != NULL) { | |
3136 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3137 | index++; | |
3138 | } | |
54d01ffb | 3139 | |
54d01ffb DG |
3140 | return nb_dom; |
3141 | ||
3142 | error: | |
3143 | return ret; | |
3144 | } | |
3145 | ||
3146 | /* | |
3147 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3148 | */ | |
b551a063 | 3149 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3150 | struct lttng_channel **channels) |
3151 | { | |
3152 | int ret; | |
3153 | ssize_t nb_chan = 0; | |
3154 | ||
b551a063 DG |
3155 | switch (domain) { |
3156 | case LTTNG_DOMAIN_KERNEL: | |
3157 | if (session->kernel_session != NULL) { | |
3158 | nb_chan = session->kernel_session->channel_count; | |
3159 | } | |
0df502fd | 3160 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3161 | break; |
3162 | case LTTNG_DOMAIN_UST: | |
3163 | if (session->ust_session != NULL) { | |
bec39940 | 3164 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3165 | session->ust_session->domain_global.channels); |
3166 | } | |
0df502fd | 3167 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3168 | break; |
3169 | default: | |
3170 | *channels = NULL; | |
1ab1ea0b | 3171 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3172 | goto error; |
3173 | } | |
3174 | ||
b551a063 DG |
3175 | if (nb_chan > 0) { |
3176 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3177 | if (*channels == NULL) { | |
3178 | ret = -LTTCOMM_FATAL; | |
3179 | goto error; | |
3180 | } | |
54d01ffb | 3181 | |
b551a063 DG |
3182 | list_lttng_channels(domain, session, *channels); |
3183 | } else { | |
3184 | *channels = NULL; | |
3185 | } | |
2bdd86d4 | 3186 | |
54d01ffb DG |
3187 | return nb_chan; |
3188 | ||
3189 | error: | |
3190 | return ret; | |
3191 | } | |
3192 | ||
3193 | /* | |
3194 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3195 | */ | |
b551a063 | 3196 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3197 | char *channel_name, struct lttng_event **events) |
3198 | { | |
b551a063 | 3199 | int ret = 0; |
54d01ffb | 3200 | ssize_t nb_event = 0; |
54d01ffb | 3201 | |
b551a063 DG |
3202 | switch (domain) { |
3203 | case LTTNG_DOMAIN_KERNEL: | |
3204 | if (session->kernel_session != NULL) { | |
3205 | nb_event = list_lttng_kernel_events(channel_name, | |
3206 | session->kernel_session, events); | |
54d01ffb | 3207 | } |
b551a063 DG |
3208 | break; |
3209 | case LTTNG_DOMAIN_UST: | |
3210 | { | |
3211 | if (session->ust_session != NULL) { | |
3212 | nb_event = list_lttng_ust_global_events(channel_name, | |
3213 | &session->ust_session->domain_global, events); | |
3214 | } | |
3215 | break; | |
54d01ffb | 3216 | } |
b551a063 | 3217 | default: |
1ab1ea0b | 3218 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3219 | goto error; |
3220 | } | |
3221 | ||
b551a063 | 3222 | ret = nb_event; |
54d01ffb DG |
3223 | |
3224 | error: | |
3225 | return ret; | |
3226 | } | |
3227 | ||
3228 | /* | |
3229 | * Process the command requested by the lttng client within the command | |
3230 | * context structure. This function make sure that the return structure (llm) | |
3231 | * is set and ready for transmission before returning. | |
3232 | * | |
3233 | * Return any error encountered or 0 for success. | |
3234 | */ | |
3235 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3236 | { | |
3237 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3238 | int need_tracing_session = 1; |
2e09ba09 | 3239 | int need_domain; |
54d01ffb DG |
3240 | |
3241 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3242 | ||
2e09ba09 MD |
3243 | switch (cmd_ctx->lsm->cmd_type) { |
3244 | case LTTNG_CREATE_SESSION: | |
3245 | case LTTNG_DESTROY_SESSION: | |
3246 | case LTTNG_LIST_SESSIONS: | |
3247 | case LTTNG_LIST_DOMAINS: | |
3248 | case LTTNG_START_TRACE: | |
3249 | case LTTNG_STOP_TRACE: | |
3250 | need_domain = 0; | |
3aace903 | 3251 | break; |
2e09ba09 MD |
3252 | default: |
3253 | need_domain = 1; | |
3254 | } | |
3255 | ||
3256 | if (opt_no_kernel && need_domain | |
3257 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
4fba7219 DG |
3258 | ret = LTTCOMM_KERN_NA; |
3259 | goto error; | |
3260 | } | |
3261 | ||
54d01ffb DG |
3262 | /* |
3263 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3264 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3265 | * command. |
3266 | */ | |
3267 | switch(cmd_ctx->lsm->cmd_type) { | |
3268 | case LTTNG_LIST_SESSIONS: | |
3269 | case LTTNG_LIST_TRACEPOINTS: | |
3270 | case LTTNG_LIST_DOMAINS: | |
3271 | case LTTNG_LIST_CHANNELS: | |
3272 | case LTTNG_LIST_EVENTS: | |
3273 | break; | |
3274 | default: | |
3275 | /* Setup lttng message with no payload */ | |
3276 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3277 | if (ret < 0) { | |
3278 | /* This label does not try to unlock the session */ | |
3279 | goto init_setup_error; | |
3280 | } | |
3281 | } | |
3282 | ||
3283 | /* Commands that DO NOT need a session. */ | |
3284 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3285 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3286 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3287 | case LTTNG_LIST_SESSIONS: |
3288 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3289 | need_tracing_session = 0; |
54d01ffb DG |
3290 | break; |
3291 | default: | |
3292 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3293 | session_lock_list(); |
54d01ffb | 3294 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3295 | session_unlock_list(); |
54d01ffb DG |
3296 | if (cmd_ctx->session == NULL) { |
3297 | if (cmd_ctx->lsm->session.name != NULL) { | |
3298 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3299 | } else { | |
3300 | /* If no session name specified */ | |
3301 | ret = LTTCOMM_SELECT_SESS; | |
3302 | } | |
3303 | goto error; | |
3304 | } else { | |
3305 | /* Acquire lock for the session */ | |
3306 | session_lock(cmd_ctx->session); | |
3307 | } | |
3308 | break; | |
3309 | } | |
b389abbe | 3310 | |
2e09ba09 MD |
3311 | if (!need_domain) { |
3312 | goto skip_domain; | |
3313 | } | |
54d01ffb DG |
3314 | /* |
3315 | * Check domain type for specific "pre-action". | |
3316 | */ | |
3317 | switch (cmd_ctx->lsm->domain.type) { | |
3318 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 DG |
3319 | if (!is_root) { |
3320 | ret = LTTCOMM_KERN_NA; | |
3321 | goto error; | |
3322 | } | |
3323 | ||
54d01ffb | 3324 | /* Kernel tracer check */ |
a4b35e07 | 3325 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3326 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3327 | ret = init_kernel_tracer(); |
3328 | if (ret != 0) { | |
54d01ffb DG |
3329 | goto error; |
3330 | } | |
3331 | } | |
5eb91c98 | 3332 | |
54d01ffb | 3333 | /* Need a session for kernel command */ |
44d3bd01 | 3334 | if (need_tracing_session) { |
54d01ffb | 3335 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3336 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3337 | if (ret < 0) { |
54d01ffb | 3338 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3339 | goto error; |
3340 | } | |
b389abbe | 3341 | } |
7d29a247 | 3342 | |
54d01ffb | 3343 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3344 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3345 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3346 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3347 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3348 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3349 | if (ret < 0) { |
54d01ffb DG |
3350 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3351 | goto error; | |
950131af | 3352 | } |
3ff2ecac MD |
3353 | } else { |
3354 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3355 | } |
0d0c377a | 3356 | } |
54d01ffb | 3357 | break; |
2bdd86d4 | 3358 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3359 | { |
44d3bd01 | 3360 | if (need_tracing_session) { |
f6a9efaa | 3361 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3362 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3363 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3364 | if (ret != LTTCOMM_OK) { |
3365 | goto error; | |
3366 | } | |
3367 | } | |
7753dea8 MD |
3368 | /* Start the UST consumer daemons */ |
3369 | /* 64-bit */ | |
3370 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3371 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3372 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3373 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3374 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3375 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3376 | if (ret < 0) { |
7753dea8 MD |
3377 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3378 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3379 | goto error; |
3380 | } | |
48842b30 | 3381 | |
7753dea8 | 3382 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3383 | } else { |
7753dea8 MD |
3384 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3385 | } | |
3386 | /* 32-bit */ | |
fc7a59ce | 3387 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3388 | ustconsumer32_data.pid == 0 && |
3389 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3390 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3391 | ret = start_consumerd(&ustconsumer32_data); | |
3392 | if (ret < 0) { | |
3393 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3394 | ust_consumerd32_fd = -EINVAL; | |
3395 | goto error; | |
3396 | } | |
3397 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3398 | } else { | |
3399 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3400 | } |
44d3bd01 DG |
3401 | } |
3402 | break; | |
48842b30 | 3403 | } |
54d01ffb | 3404 | default: |
54d01ffb DG |
3405 | break; |
3406 | } | |
2e09ba09 | 3407 | skip_domain: |
33a2b854 | 3408 | |
8e0af1b4 MD |
3409 | /* |
3410 | * Check that the UID or GID match that of the tracing session. | |
3411 | * The root user can interact with all sessions. | |
3412 | */ | |
3413 | if (need_tracing_session) { | |
3414 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3415 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3416 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3417 | ret = LTTCOMM_EPERM; |
3418 | goto error; | |
3419 | } | |
3420 | } | |
3421 | ||
54d01ffb DG |
3422 | /* Process by command type */ |
3423 | switch (cmd_ctx->lsm->cmd_type) { | |
3424 | case LTTNG_ADD_CONTEXT: | |
3425 | { | |
3426 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3427 | cmd_ctx->lsm->u.context.channel_name, | |
3428 | cmd_ctx->lsm->u.context.event_name, | |
3429 | &cmd_ctx->lsm->u.context.ctx); | |
3430 | break; | |
3431 | } | |
3432 | case LTTNG_DISABLE_CHANNEL: | |
3433 | { | |
3434 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3435 | cmd_ctx->lsm->u.disable.channel_name); | |
3436 | break; | |
3437 | } | |
3438 | case LTTNG_DISABLE_EVENT: | |
3439 | { | |
3440 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3441 | cmd_ctx->lsm->u.disable.channel_name, | |
3442 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3443 | break; |
3444 | } | |
54d01ffb DG |
3445 | case LTTNG_DISABLE_ALL_EVENT: |
3446 | { | |
2bdd86d4 | 3447 | DBG("Disabling all events"); |
54d01ffb DG |
3448 | |
3449 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3450 | cmd_ctx->lsm->u.disable.channel_name); | |
3451 | break; | |
3452 | } | |
3453 | case LTTNG_ENABLE_CHANNEL: | |
3454 | { | |
aea829b3 | 3455 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3456 | &cmd_ctx->lsm->u.channel.chan); |
3457 | break; | |
3458 | } | |
3459 | case LTTNG_ENABLE_EVENT: | |
3460 | { | |
3461 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3462 | cmd_ctx->lsm->u.enable.channel_name, | |
3463 | &cmd_ctx->lsm->u.enable.event); | |
3464 | break; | |
3465 | } | |
3466 | case LTTNG_ENABLE_ALL_EVENT: | |
3467 | { | |
2bdd86d4 | 3468 | DBG("Enabling all events"); |
54d01ffb DG |
3469 | |
3470 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3471 | cmd_ctx->lsm->u.enable.channel_name, |
3472 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3473 | break; |
3474 | } | |
052da939 | 3475 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3476 | { |
9f19cc17 | 3477 | struct lttng_event *events; |
54d01ffb | 3478 | ssize_t nb_events; |
052da939 | 3479 | |
54d01ffb DG |
3480 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3481 | if (nb_events < 0) { | |
3482 | ret = -nb_events; | |
3483 | goto error; | |
2ef84c95 DG |
3484 | } |
3485 | ||
3486 | /* | |
3487 | * Setup lttng message with payload size set to the event list size in | |
3488 | * bytes and then copy list into the llm payload. | |
3489 | */ | |
052da939 | 3490 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3491 | if (ret < 0) { |
052da939 | 3492 | free(events); |
2ef84c95 DG |
3493 | goto setup_error; |
3494 | } | |
3495 | ||
3496 | /* Copy event list into message payload */ | |
9f19cc17 | 3497 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3498 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3499 | |
9f19cc17 | 3500 | free(events); |
2ef84c95 DG |
3501 | |
3502 | ret = LTTCOMM_OK; | |
3503 | break; | |
3504 | } | |
f3ed775e | 3505 | case LTTNG_START_TRACE: |
8c0faa1d | 3506 | { |
54d01ffb | 3507 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3508 | break; |
3509 | } | |
f3ed775e | 3510 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3511 | { |
54d01ffb | 3512 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3513 | break; |
3514 | } | |
5e16da05 MD |
3515 | case LTTNG_CREATE_SESSION: |
3516 | { | |
54d01ffb | 3517 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3518 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3519 | break; |
3520 | } | |
3521 | case LTTNG_DESTROY_SESSION: | |
3522 | { | |
54d01ffb DG |
3523 | ret = cmd_destroy_session(cmd_ctx->session, |
3524 | cmd_ctx->lsm->session.name); | |
5461b305 | 3525 | break; |
5e16da05 | 3526 | } |
9f19cc17 | 3527 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3528 | { |
54d01ffb DG |
3529 | ssize_t nb_dom; |
3530 | struct lttng_domain *domains; | |
5461b305 | 3531 | |
54d01ffb DG |
3532 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3533 | if (nb_dom < 0) { | |
3534 | ret = -nb_dom; | |
3535 | goto error; | |
ce3d728c | 3536 | } |
520ff687 | 3537 | |
54d01ffb | 3538 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3539 | if (ret < 0) { |
3540 | goto setup_error; | |
520ff687 | 3541 | } |
57167058 | 3542 | |
54d01ffb DG |
3543 | /* Copy event list into message payload */ |
3544 | memcpy(cmd_ctx->llm->payload, domains, | |
3545 | nb_dom * sizeof(struct lttng_domain)); | |
3546 | ||
3547 | free(domains); | |
5e16da05 | 3548 | |
5461b305 | 3549 | ret = LTTCOMM_OK; |
5e16da05 MD |
3550 | break; |
3551 | } | |
9f19cc17 | 3552 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3553 | { |
54d01ffb DG |
3554 | size_t nb_chan; |
3555 | struct lttng_channel *channels; | |
3556 | ||
b551a063 DG |
3557 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3558 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3559 | if (nb_chan < 0) { |
3560 | ret = -nb_chan; | |
3561 | goto error; | |
5461b305 | 3562 | } |
ca95a216 | 3563 | |
54d01ffb | 3564 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3565 | if (ret < 0) { |
3566 | goto setup_error; | |
3567 | } | |
9f19cc17 | 3568 | |
54d01ffb DG |
3569 | /* Copy event list into message payload */ |
3570 | memcpy(cmd_ctx->llm->payload, channels, | |
3571 | nb_chan * sizeof(struct lttng_channel)); | |
3572 | ||
3573 | free(channels); | |
9f19cc17 DG |
3574 | |
3575 | ret = LTTCOMM_OK; | |
5461b305 | 3576 | break; |
5e16da05 | 3577 | } |
9f19cc17 | 3578 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3579 | { |
b551a063 | 3580 | ssize_t nb_event; |
684d34d2 | 3581 | struct lttng_event *events = NULL; |
9f19cc17 | 3582 | |
b551a063 | 3583 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3584 | cmd_ctx->lsm->u.list.channel_name, &events); |
3585 | if (nb_event < 0) { | |
3586 | ret = -nb_event; | |
3587 | goto error; | |
5461b305 | 3588 | } |
ca95a216 | 3589 | |
54d01ffb | 3590 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3591 | if (ret < 0) { |
3592 | goto setup_error; | |
3593 | } | |
9f19cc17 | 3594 | |
54d01ffb DG |
3595 | /* Copy event list into message payload */ |
3596 | memcpy(cmd_ctx->llm->payload, events, | |
3597 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3598 | |
54d01ffb | 3599 | free(events); |
9f19cc17 DG |
3600 | |
3601 | ret = LTTCOMM_OK; | |
5461b305 | 3602 | break; |
5e16da05 MD |
3603 | } |
3604 | case LTTNG_LIST_SESSIONS: | |
3605 | { | |
8e0af1b4 | 3606 | unsigned int nr_sessions; |
5461b305 | 3607 | |
8e0af1b4 | 3608 | session_lock_list(); |
730389d9 DG |
3609 | nr_sessions = lttng_sessions_count( |
3610 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3611 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3612 | |
8e0af1b4 | 3613 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3614 | if (ret < 0) { |
54d01ffb | 3615 | session_unlock_list(); |
5461b305 | 3616 | goto setup_error; |
e065084a | 3617 | } |
5e16da05 | 3618 | |
6c9cc2ab | 3619 | /* Filled the session array */ |
8e0af1b4 | 3620 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3621 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3622 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3623 | |
54d01ffb | 3624 | session_unlock_list(); |
5e16da05 | 3625 | |
5461b305 | 3626 | ret = LTTCOMM_OK; |
5e16da05 MD |
3627 | break; |
3628 | } | |
d0254c7c MD |
3629 | case LTTNG_CALIBRATE: |
3630 | { | |
54d01ffb DG |
3631 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3632 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3633 | break; |
3634 | } | |
d9800920 DG |
3635 | case LTTNG_REGISTER_CONSUMER: |
3636 | { | |
54d01ffb DG |
3637 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3638 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3639 | break; |
3640 | } | |
5e16da05 | 3641 | default: |
5e16da05 | 3642 | ret = LTTCOMM_UND; |
5461b305 | 3643 | break; |
fac6795d DG |
3644 | } |
3645 | ||
5461b305 | 3646 | error: |
5461b305 DG |
3647 | if (cmd_ctx->llm == NULL) { |
3648 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3649 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3650 | goto setup_error; |
3651 | } | |
3652 | } | |
54d01ffb | 3653 | /* Set return code */ |
5461b305 | 3654 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3655 | setup_error: |
b5541356 | 3656 | if (cmd_ctx->session) { |
54d01ffb | 3657 | session_unlock(cmd_ctx->session); |
b5541356 | 3658 | } |
54d01ffb | 3659 | init_setup_error: |
8028d920 | 3660 | return ret; |
fac6795d DG |
3661 | } |
3662 | ||
1d4b027a | 3663 | /* |
d063d709 DG |
3664 | * This thread manage all clients request using the unix client socket for |
3665 | * communication. | |
1d4b027a DG |
3666 | */ |
3667 | static void *thread_manage_clients(void *data) | |
3668 | { | |
a4b35e07 | 3669 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3670 | uint32_t revents, nb_fd; |
273ea72c | 3671 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3672 | struct lttng_poll_event events; |
1d4b027a DG |
3673 | |
3674 | DBG("[thread] Manage client started"); | |
3675 | ||
f6a9efaa DG |
3676 | rcu_register_thread(); |
3677 | ||
1d4b027a DG |
3678 | ret = lttcomm_listen_unix_sock(client_sock); |
3679 | if (ret < 0) { | |
3680 | goto error; | |
3681 | } | |
3682 | ||
5eb91c98 DG |
3683 | /* |
3684 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3685 | * more will be added to this poll set. | |
3686 | */ | |
3687 | ret = create_thread_poll_set(&events, 2); | |
3688 | if (ret < 0) { | |
3689 | goto error; | |
3690 | } | |
273ea72c | 3691 | |
5eb91c98 DG |
3692 | /* Add the application registration socket */ |
3693 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3694 | if (ret < 0) { | |
3695 | goto error; | |
3696 | } | |
273ea72c | 3697 | |
bbd973c2 DG |
3698 | /* |
3699 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3700 | */ |
3701 | if (opt_sig_parent) { | |
8db8d1dc | 3702 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3703 | } |
3704 | ||
3705 | while (1) { | |
1d4b027a | 3706 | DBG("Accepting client command ..."); |
273ea72c | 3707 | |
5eb91c98 DG |
3708 | nb_fd = LTTNG_POLL_GETNB(&events); |
3709 | ||
273ea72c | 3710 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3711 | restart: |
5eb91c98 | 3712 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3713 | if (ret < 0) { |
88f2b785 MD |
3714 | /* |
3715 | * Restart interrupted system call. | |
3716 | */ | |
3717 | if (errno == EINTR) { | |
3718 | goto restart; | |
3719 | } | |
273ea72c DG |
3720 | goto error; |
3721 | } | |
3722 | ||
5eb91c98 DG |
3723 | for (i = 0; i < nb_fd; i++) { |
3724 | /* Fetch once the poll data */ | |
3725 | revents = LTTNG_POLL_GETEV(&events, i); | |
3726 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3727 | ||
3728 | /* Thread quit pipe has been closed. Killing thread. */ | |
3729 | ret = check_thread_quit_pipe(pollfd, revents); | |
3730 | if (ret) { | |
3731 | goto error; | |
3732 | } | |
3733 | ||
3734 | /* Event on the registration socket */ | |
3735 | if (pollfd == client_sock) { | |
3736 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3737 | ERR("Client socket poll error"); | |
3738 | goto error; | |
3739 | } | |
3740 | } | |
3741 | } | |
3742 | ||
3743 | DBG("Wait for client response"); | |
3744 | ||
3745 | sock = lttcomm_accept_unix_sock(client_sock); | |
3746 | if (sock < 0) { | |
273ea72c | 3747 | goto error; |
273ea72c DG |
3748 | } |
3749 | ||
be040666 DG |
3750 | /* Set socket option for credentials retrieval */ |
3751 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3752 | if (ret < 0) { | |
3753 | goto error; | |
3754 | } | |
3755 | ||
5eb91c98 | 3756 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3757 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3758 | if (cmd_ctx == NULL) { |
76d7553f | 3759 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3760 | goto error; |
5eb91c98 | 3761 | } |
1d4b027a | 3762 | |
5eb91c98 | 3763 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3764 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3765 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3766 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3767 | goto error; |
3768 | } | |
1d4b027a | 3769 | |
5eb91c98 DG |
3770 | cmd_ctx->llm = NULL; |
3771 | cmd_ctx->session = NULL; | |
1d4b027a | 3772 | |
5eb91c98 DG |
3773 | /* |
3774 | * Data is received from the lttng client. The struct | |
3775 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3776 | * the client. | |
3777 | */ | |
3778 | DBG("Receiving data from client ..."); | |
be040666 DG |
3779 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3780 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3781 | if (ret <= 0) { |
3782 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3783 | ret = close(sock); |
3784 | if (ret) { | |
3785 | PERROR("close"); | |
3786 | } | |
3787 | sock = -1; | |
5eb91c98 DG |
3788 | free(cmd_ctx); |
3789 | continue; | |
3790 | } | |
1d4b027a | 3791 | |
5eb91c98 DG |
3792 | // TODO: Validate cmd_ctx including sanity check for |
3793 | // security purpose. | |
f7776ea7 | 3794 | |
f6a9efaa | 3795 | rcu_thread_online(); |
5eb91c98 DG |
3796 | /* |
3797 | * This function dispatch the work to the kernel or userspace tracer | |
3798 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3799 | * informations for the client. The command context struct contains | |
3800 | * everything this function may needs. | |
3801 | */ | |
3802 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3803 | rcu_thread_offline(); |
5eb91c98 | 3804 | if (ret < 0) { |
bbd973c2 | 3805 | /* |
5eb91c98 | 3806 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3807 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3808 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3809 | */ |
bbd973c2 | 3810 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3811 | continue; |
3812 | } | |
d6e4fca4 | 3813 | |
54d01ffb DG |
3814 | DBG("Sending response (size: %d, retcode: %s)", |
3815 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3816 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3817 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3818 | if (ret < 0) { |
3819 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3820 | } |
1d4b027a | 3821 | |
5eb91c98 | 3822 | /* End of transmission */ |
76d7553f MD |
3823 | ret = close(sock); |
3824 | if (ret) { | |
3825 | PERROR("close"); | |
3826 | } | |
3827 | sock = -1; | |
be040666 DG |
3828 | |
3829 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3830 | } |
3831 | ||
5eb91c98 DG |
3832 | error: |
3833 | DBG("Client thread dying"); | |
273ea72c | 3834 | unlink(client_unix_sock_path); |
76d7553f MD |
3835 | if (client_sock >= 0) { |
3836 | ret = close(client_sock); | |
3837 | if (ret) { | |
3838 | PERROR("close"); | |
3839 | } | |
a4b35e07 MD |
3840 | } |
3841 | if (sock >= 0) { | |
76d7553f MD |
3842 | ret = close(sock); |
3843 | if (ret) { | |
3844 | PERROR("close"); | |
3845 | } | |
a4b35e07 | 3846 | } |
273ea72c | 3847 | |
5eb91c98 | 3848 | lttng_poll_clean(&events); |
a2fb29a5 | 3849 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3850 | |
3851 | rcu_unregister_thread(); | |
1d4b027a DG |
3852 | return NULL; |
3853 | } | |
3854 | ||
3855 | ||
fac6795d DG |
3856 | /* |
3857 | * usage function on stderr | |
3858 | */ | |
3859 | static void usage(void) | |
3860 | { | |
b716ce68 | 3861 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3862 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3863 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3864 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3865 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3866 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3867 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3868 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3869 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3870 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3871 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3872 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3873 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3874 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3875 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3876 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3877 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3878 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3879 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3880 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3881 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3882 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3883 | } |
3884 | ||
3885 | /* | |
3886 | * daemon argument parsing | |
3887 | */ | |
3888 | static int parse_args(int argc, char **argv) | |
3889 | { | |
3890 | int c; | |
3891 | ||
3892 | static struct option long_options[] = { | |
3893 | { "client-sock", 1, 0, 'c' }, | |
3894 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3895 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3896 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3897 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3898 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3899 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3900 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3901 | { "consumerd32-path", 1, 0, 'u' }, | |
3902 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3903 | { "consumerd64-path", 1, 0, 't' }, | |
3904 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3905 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3906 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3907 | { "help", 0, 0, 'h' }, |
3908 | { "group", 1, 0, 'g' }, | |
3909 | { "version", 0, 0, 'V' }, | |
75462a81 | 3910 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3911 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3912 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3913 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3914 | { NULL, 0, 0, 0 } |
3915 | }; | |
3916 | ||
3917 | while (1) { | |
3918 | int option_index = 0; | |
4fba7219 | 3919 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3920 | long_options, &option_index); |
fac6795d DG |
3921 | if (c == -1) { |
3922 | break; | |
3923 | } | |
3924 | ||
3925 | switch (c) { | |
3926 | case 0: | |
3927 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3928 | if (optarg) { | |
3929 | fprintf(stderr, " with arg %s\n", optarg); | |
3930 | } | |
3931 | break; | |
b716ce68 | 3932 | case 'c': |
fac6795d DG |
3933 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3934 | break; | |
3935 | case 'a': | |
3936 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3937 | break; | |
3938 | case 'd': | |
3939 | opt_daemon = 1; | |
3940 | break; | |
3941 | case 'g': | |
fb09408a | 3942 | opt_tracing_group = optarg; |
fac6795d DG |
3943 | break; |
3944 | case 'h': | |
3945 | usage(); | |
3946 | exit(EXIT_FAILURE); | |
3947 | case 'V': | |
3948 | fprintf(stdout, "%s\n", VERSION); | |
3949 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3950 | case 'S': |
3951 | opt_sig_parent = 1; | |
3952 | break; | |
d6f42150 | 3953 | case 'E': |
3bd1e081 | 3954 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3955 | break; |
3956 | case 'C': | |
3bd1e081 MD |
3957 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3958 | break; | |
3959 | case 'F': | |
7753dea8 | 3960 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3961 | break; |
3962 | case 'D': | |
7753dea8 MD |
3963 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3964 | break; | |
3965 | case 'H': | |
3966 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3967 | break; | |
3968 | case 'G': | |
3969 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3970 | break; |
4fba7219 DG |
3971 | case 'N': |
3972 | opt_no_kernel = 1; | |
3973 | break; | |
75462a81 DG |
3974 | case 'q': |
3975 | opt_quiet = 1; | |
3976 | break; | |
3f9947db | 3977 | case 'v': |
53086306 DG |
3978 | /* Verbose level can increase using multiple -v */ |
3979 | opt_verbose += 1; | |
3f9947db | 3980 | break; |
31f73cc9 | 3981 | case 'Z': |
3bd1e081 | 3982 | opt_verbose_consumer += 1; |
31f73cc9 | 3983 | break; |
fb09408a | 3984 | case 'u': |
fc7a59ce | 3985 | consumerd32_bin= optarg; |
ebaeda94 MD |
3986 | break; |
3987 | case 'U': | |
3988 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3989 | break; |
3990 | case 't': | |
fc7a59ce | 3991 | consumerd64_bin = optarg; |
ebaeda94 MD |
3992 | break; |
3993 | case 'T': | |
3994 | consumerd64_libdir = optarg; | |
fb09408a | 3995 | break; |
fac6795d DG |
3996 | default: |
3997 | /* Unknown option or other error. | |
3998 | * Error is printed by getopt, just return */ | |
3999 | return -1; | |
4000 | } | |
4001 | } | |
4002 | ||
4003 | return 0; | |
4004 | } | |
4005 | ||
4006 | /* | |
d063d709 | 4007 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4008 | * apps_sock - The communication socket for all UST apps. |
4009 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4010 | */ |
cf3af59e | 4011 | static int init_daemon_socket(void) |
fac6795d DG |
4012 | { |
4013 | int ret = 0; | |
4014 | mode_t old_umask; | |
4015 | ||
4016 | old_umask = umask(0); | |
4017 | ||
4018 | /* Create client tool unix socket */ | |
d6f42150 DG |
4019 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4020 | if (client_sock < 0) { | |
4021 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4022 | ret = -1; |
4023 | goto end; | |
4024 | } | |
4025 | ||
4026 | /* File permission MUST be 660 */ | |
4027 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4028 | if (ret < 0) { | |
d6f42150 | 4029 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4030 | PERROR("chmod"); |
fac6795d DG |
4031 | goto end; |
4032 | } | |
4033 | ||
4034 | /* Create the application unix socket */ | |
d6f42150 DG |
4035 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4036 | if (apps_sock < 0) { | |
4037 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4038 | ret = -1; |
4039 | goto end; | |
4040 | } | |
4041 | ||
d6f42150 | 4042 | /* File permission MUST be 666 */ |
54d01ffb DG |
4043 | ret = chmod(apps_unix_sock_path, |
4044 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4045 | if (ret < 0) { |
d6f42150 | 4046 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4047 | PERROR("chmod"); |
fac6795d DG |
4048 | goto end; |
4049 | } | |
4050 | ||
4051 | end: | |
4052 | umask(old_umask); | |
4053 | return ret; | |
4054 | } | |
4055 | ||
4056 | /* | |
54d01ffb DG |
4057 | * Check if the global socket is available, and if a daemon is answering at the |
4058 | * other side. If yes, error is returned. | |
fac6795d | 4059 | */ |
cf3af59e | 4060 | static int check_existing_daemon(void) |
fac6795d | 4061 | { |
7d8234d9 | 4062 | /* Is there anybody out there ? */ |
099e26bd | 4063 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4064 | return -EEXIST; |
099e26bd | 4065 | } |
b09c7c76 DG |
4066 | |
4067 | return 0; | |
fac6795d DG |
4068 | } |
4069 | ||
fac6795d | 4070 | /* |
d063d709 | 4071 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4072 | * |
d063d709 | 4073 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4074 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4075 | */ |
be040666 | 4076 | static int set_permissions(char *rundir) |
fac6795d DG |
4077 | { |
4078 | int ret; | |
996b65c8 | 4079 | gid_t gid; |
fac6795d | 4080 | |
996b65c8 MD |
4081 | gid = allowed_group(); |
4082 | if (gid < 0) { | |
be040666 DG |
4083 | WARN("No tracing group detected"); |
4084 | ret = 0; | |
fac6795d DG |
4085 | goto end; |
4086 | } | |
4087 | ||
d6f42150 | 4088 | /* Set lttng run dir */ |
be040666 | 4089 | ret = chown(rundir, 0, gid); |
d6f42150 | 4090 | if (ret < 0) { |
be040666 | 4091 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4092 | PERROR("chown"); |
d6f42150 DG |
4093 | } |
4094 | ||
d1613cf5 | 4095 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4096 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4097 | if (ret < 0) { |
4098 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4099 | PERROR("chmod"); |
d1613cf5 JN |
4100 | } |
4101 | ||
d6f42150 | 4102 | /* lttng client socket path */ |
996b65c8 | 4103 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4104 | if (ret < 0) { |
d6f42150 | 4105 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4106 | PERROR("chown"); |
d6f42150 DG |
4107 | } |
4108 | ||
3bd1e081 MD |
4109 | /* kconsumer error socket path */ |
4110 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4111 | if (ret < 0) { |
3bd1e081 | 4112 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4113 | PERROR("chown"); |
3bd1e081 MD |
4114 | } |
4115 | ||
7753dea8 MD |
4116 | /* 64-bit ustconsumer error socket path */ |
4117 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4118 | if (ret < 0) { | |
4119 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4120 | PERROR("chown"); |
7753dea8 MD |
4121 | } |
4122 | ||
4123 | /* 32-bit ustconsumer compat32 error socket path */ | |
4124 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4125 | if (ret < 0) { |
7753dea8 | 4126 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4127 | PERROR("chown"); |
fac6795d DG |
4128 | } |
4129 | ||
d6f42150 | 4130 | DBG("All permissions are set"); |
e07ae692 | 4131 | |
fac6795d DG |
4132 | end: |
4133 | return ret; | |
4134 | } | |
4135 | ||
7a485870 | 4136 | /* |
d063d709 | 4137 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4138 | * Closed in cleanup(). |
7a485870 DG |
4139 | */ |
4140 | static int create_kernel_poll_pipe(void) | |
4141 | { | |
730389d9 DG |
4142 | int ret, i; |
4143 | ||
4144 | ret = pipe(kernel_poll_pipe); | |
4145 | if (ret < 0) { | |
4146 | PERROR("kernel poll pipe"); | |
4147 | goto error; | |
4148 | } | |
4149 | ||
4150 | for (i = 0; i < 2; i++) { | |
4151 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4152 | if (ret < 0) { | |
4153 | PERROR("fcntl kernel_poll_pipe"); | |
4154 | goto error; | |
4155 | } | |
4156 | } | |
4157 | ||
4158 | error: | |
4159 | return ret; | |
7a485870 DG |
4160 | } |
4161 | ||
099e26bd DG |
4162 | /* |
4163 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4164 | * Closed in cleanup(). |
099e26bd DG |
4165 | */ |
4166 | static int create_apps_cmd_pipe(void) | |
4167 | { | |
730389d9 DG |
4168 | int ret, i; |
4169 | ||
4170 | ret = pipe(apps_cmd_pipe); | |
4171 | if (ret < 0) { | |
4172 | PERROR("apps cmd pipe"); | |
4173 | goto error; | |
4174 | } | |
4175 | ||
4176 | for (i = 0; i < 2; i++) { | |
4177 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4178 | if (ret < 0) { | |
4179 | PERROR("fcntl apps_cmd_pipe"); | |
4180 | goto error; | |
4181 | } | |
4182 | } | |
4183 | ||
4184 | error: | |
4185 | return ret; | |
099e26bd DG |
4186 | } |
4187 | ||
d6f42150 | 4188 | /* |
d063d709 | 4189 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4190 | */ |
67e40797 | 4191 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4192 | { |
4193 | int ret; | |
4194 | ||
67e40797 DG |
4195 | DBG3("Creating LTTng run directory: %s", rundir); |
4196 | ||
d1613cf5 | 4197 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4198 | if (ret < 0) { |
b1f11e69 | 4199 | if (errno != EEXIST) { |
67e40797 | 4200 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4201 | goto error; |
4202 | } else { | |
4203 | ret = 0; | |
4204 | } | |
d6f42150 DG |
4205 | } |
4206 | ||
4207 | error: | |
4208 | return ret; | |
4209 | } | |
4210 | ||
4211 | /* | |
d063d709 DG |
4212 | * Setup sockets and directory needed by the kconsumerd communication with the |
4213 | * session daemon. | |
d6f42150 | 4214 | */ |
67e40797 DG |
4215 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4216 | const char *rundir) | |
d6f42150 DG |
4217 | { |
4218 | int ret; | |
67e40797 | 4219 | char path[PATH_MAX]; |
d6f42150 | 4220 | |
67e40797 | 4221 | switch (consumer_data->type) { |
7753dea8 | 4222 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4223 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4224 | break; |
4225 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4226 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4227 | break; |
4228 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4229 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4230 | break; |
4231 | default: | |
4232 | ERR("Consumer type unknown"); | |
4233 | ret = -EINVAL; | |
4234 | goto error; | |
d6f42150 DG |
4235 | } |
4236 | ||
67e40797 DG |
4237 | DBG2("Creating consumer directory: %s", path); |
4238 | ||
d1613cf5 | 4239 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4240 | if (ret < 0) { |
6beb2242 | 4241 | if (errno != EEXIST) { |
3bd1e081 | 4242 | ERR("Failed to create %s", path); |
6beb2242 DG |
4243 | goto error; |
4244 | } | |
4245 | ret = 0; | |
d6f42150 DG |
4246 | } |
4247 | ||
4248 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4249 | consumer_data->err_sock = |
4250 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4251 | if (consumer_data->err_sock < 0) { | |
4252 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4253 | ret = -1; |
4254 | goto error; | |
4255 | } | |
4256 | ||
4257 | /* File permission MUST be 660 */ | |
3bd1e081 | 4258 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4259 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4260 | if (ret < 0) { |
3bd1e081 | 4261 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4262 | PERROR("chmod"); |
d6f42150 DG |
4263 | goto error; |
4264 | } | |
4265 | ||
4266 | error: | |
4267 | return ret; | |
4268 | } | |
4269 | ||
fac6795d | 4270 | /* |
d063d709 | 4271 | * Signal handler for the daemon |
cf3af59e | 4272 | * |
54d01ffb DG |
4273 | * Simply stop all worker threads, leaving main() return gracefully after |
4274 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4275 | */ |
4276 | static void sighandler(int sig) | |
4277 | { | |
4278 | switch (sig) { | |
cf3af59e | 4279 | case SIGPIPE: |
af87c45a | 4280 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4281 | return; |
4282 | case SIGINT: | |
af87c45a | 4283 | DBG("SIGINT caught"); |
cf3af59e MD |
4284 | stop_threads(); |
4285 | break; | |
4286 | case SIGTERM: | |
af87c45a | 4287 | DBG("SIGTERM caught"); |
cf3af59e MD |
4288 | stop_threads(); |
4289 | break; | |
4290 | default: | |
4291 | break; | |
fac6795d | 4292 | } |
fac6795d DG |
4293 | } |
4294 | ||
4295 | /* | |
d063d709 | 4296 | * Setup signal handler for : |
1d4b027a | 4297 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4298 | */ |
1d4b027a | 4299 | static int set_signal_handler(void) |
fac6795d | 4300 | { |
1d4b027a DG |
4301 | int ret = 0; |
4302 | struct sigaction sa; | |
4303 | sigset_t sigset; | |
fac6795d | 4304 | |
1d4b027a | 4305 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4306 | PERROR("sigemptyset"); |
1d4b027a DG |
4307 | return ret; |
4308 | } | |
d6f42150 | 4309 | |
1d4b027a DG |
4310 | sa.sa_handler = sighandler; |
4311 | sa.sa_mask = sigset; | |
4312 | sa.sa_flags = 0; | |
4313 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4314 | PERROR("sigaction"); |
1d4b027a | 4315 | return ret; |
d6f42150 DG |
4316 | } |
4317 | ||
1d4b027a | 4318 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4319 | PERROR("sigaction"); |
1d4b027a | 4320 | return ret; |
d6f42150 | 4321 | } |
aaf26714 | 4322 | |
1d4b027a | 4323 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4324 | PERROR("sigaction"); |
1d4b027a | 4325 | return ret; |
8c0faa1d DG |
4326 | } |
4327 | ||
1d4b027a DG |
4328 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4329 | ||
4330 | return ret; | |
fac6795d DG |
4331 | } |
4332 | ||
f3ed775e | 4333 | /* |
d063d709 DG |
4334 | * Set open files limit to unlimited. This daemon can open a large number of |
4335 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4336 | */ |
4337 | static void set_ulimit(void) | |
4338 | { | |
4339 | int ret; | |
4340 | struct rlimit lim; | |
4341 | ||
a88df331 | 4342 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4343 | lim.rlim_cur = 65535; |
4344 | lim.rlim_max = 65535; | |
4345 | ||
4346 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4347 | if (ret < 0) { | |
76d7553f | 4348 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4349 | } |
4350 | } | |
4351 | ||
fac6795d DG |
4352 | /* |
4353 | * main | |
4354 | */ | |
4355 | int main(int argc, char **argv) | |
4356 | { | |
fac6795d DG |
4357 | int ret = 0; |
4358 | void *status; | |
b082db07 | 4359 | const char *home_path; |
fac6795d | 4360 | |
335a95b7 MD |
4361 | init_kernel_workarounds(); |
4362 | ||
f6a9efaa DG |
4363 | rcu_register_thread(); |
4364 | ||
273ea72c | 4365 | /* Create thread quit pipe */ |
cf3af59e MD |
4366 | if ((ret = init_thread_quit_pipe()) < 0) { |
4367 | goto error; | |
273ea72c DG |
4368 | } |
4369 | ||
7753dea8 | 4370 | setup_consumerd_path(); |
fb09408a | 4371 | |
fac6795d DG |
4372 | /* Parse arguments */ |
4373 | progname = argv[0]; | |
4374 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4375 | goto error; |
fac6795d DG |
4376 | } |
4377 | ||
4378 | /* Daemonize */ | |
4379 | if (opt_daemon) { | |
53094c05 DG |
4380 | ret = daemon(0, 0); |
4381 | if (ret < 0) { | |
76d7553f | 4382 | PERROR("daemon"); |
cf3af59e | 4383 | goto error; |
53094c05 | 4384 | } |
fac6795d DG |
4385 | } |
4386 | ||
4387 | /* Check if daemon is UID = 0 */ | |
4388 | is_root = !getuid(); | |
4389 | ||
fac6795d | 4390 | if (is_root) { |
990570ed | 4391 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4392 | |
4393 | /* Create global run dir with root access */ | |
4394 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4395 | if (ret < 0) { |
cf3af59e | 4396 | goto error; |
d6f42150 DG |
4397 | } |
4398 | ||
fac6795d | 4399 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4400 | snprintf(apps_unix_sock_path, PATH_MAX, |
4401 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4402 | } |
4403 | ||
4404 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4405 | snprintf(client_unix_sock_path, PATH_MAX, |
4406 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4407 | } | |
0fdd1e2c DG |
4408 | |
4409 | /* Set global SHM for ust */ | |
4410 | if (strlen(wait_shm_path) == 0) { | |
4411 | snprintf(wait_shm_path, PATH_MAX, | |
4412 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4413 | } | |
67e40797 DG |
4414 | |
4415 | /* Setup kernel consumerd path */ | |
4416 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4417 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4418 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4419 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4420 | |
4421 | DBG2("Kernel consumer err path: %s", | |
4422 | kconsumer_data.err_unix_sock_path); | |
4423 | DBG2("Kernel consumer cmd path: %s", | |
4424 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4425 | } else { |
b082db07 DG |
4426 | home_path = get_home_dir(); |
4427 | if (home_path == NULL) { | |
273ea72c DG |
4428 | /* TODO: Add --socket PATH option */ |
4429 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4430 | ret = -EPERM; |
4431 | goto error; | |
b082db07 DG |
4432 | } |
4433 | ||
67e40797 DG |
4434 | /* |
4435 | * Create rundir from home path. This will create something like | |
4436 | * $HOME/.lttng | |
4437 | */ | |
990570ed | 4438 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4439 | if (ret < 0) { |
4440 | ret = -ENOMEM; | |
4441 | goto error; | |
4442 | } | |
4443 | ||
4444 | ret = create_lttng_rundir(rundir); | |
4445 | if (ret < 0) { | |
4446 | goto error; | |
4447 | } | |
4448 | ||
fac6795d | 4449 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4450 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4451 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4452 | } |
4453 | ||
4454 | /* Set the cli tool unix socket path */ | |
4455 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4456 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4457 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4458 | } |
0fdd1e2c DG |
4459 | |
4460 | /* Set global SHM for ust */ | |
4461 | if (strlen(wait_shm_path) == 0) { | |
4462 | snprintf(wait_shm_path, PATH_MAX, | |
4463 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4464 | } | |
fac6795d DG |
4465 | } |
4466 | ||
847177cd DG |
4467 | DBG("Client socket path %s", client_unix_sock_path); |
4468 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4469 | DBG("LTTng run directory path: %s", rundir); |
4470 | ||
4471 | /* 32 bits consumerd path setup */ | |
4472 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4473 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4474 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4475 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4476 | |
4477 | DBG2("UST consumer 32 bits err path: %s", | |
4478 | ustconsumer32_data.err_unix_sock_path); | |
4479 | DBG2("UST consumer 32 bits cmd path: %s", | |
4480 | ustconsumer32_data.cmd_unix_sock_path); | |
4481 | ||
4482 | /* 64 bits consumerd path setup */ | |
4483 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4484 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4485 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4486 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4487 | |
4488 | DBG2("UST consumer 64 bits err path: %s", | |
4489 | ustconsumer64_data.err_unix_sock_path); | |
4490 | DBG2("UST consumer 64 bits cmd path: %s", | |
4491 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4492 | |
273ea72c | 4493 | /* |
7d8234d9 | 4494 | * See if daemon already exist. |
fac6795d | 4495 | */ |
7d8234d9 | 4496 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4497 | ERR("Already running daemon.\n"); |
273ea72c | 4498 | /* |
cf3af59e MD |
4499 | * We do not goto exit because we must not cleanup() |
4500 | * because a daemon is already running. | |
ab118b20 | 4501 | */ |
cf3af59e | 4502 | goto error; |
a88df331 DG |
4503 | } |
4504 | ||
54d01ffb | 4505 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4506 | |
4507 | /* | |
4508 | * These actions must be executed as root. We do that *after* setting up | |
4509 | * the sockets path because we MUST make the check for another daemon using | |
4510 | * those paths *before* trying to set the kernel consumer sockets and init | |
4511 | * kernel tracer. | |
4512 | */ | |
4513 | if (is_root) { | |
67e40797 | 4514 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4515 | if (ret < 0) { |
4516 | goto exit; | |
4517 | } | |
4518 | ||
a88df331 | 4519 | /* Setup kernel tracer */ |
4fba7219 DG |
4520 | if (!opt_no_kernel) { |
4521 | init_kernel_tracer(); | |
4522 | } | |
a88df331 DG |
4523 | |
4524 | /* Set ulimit for open files */ | |
4525 | set_ulimit(); | |
fac6795d DG |
4526 | } |
4527 | ||
67e40797 DG |
4528 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4529 | if (ret < 0) { | |
4530 | goto exit; | |
4531 | } | |
4532 | ||
4533 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4534 | if (ret < 0) { | |
4535 | goto exit; | |
4536 | } | |
4537 | ||
cf3af59e MD |
4538 | if ((ret = set_signal_handler()) < 0) { |
4539 | goto exit; | |
fac6795d DG |
4540 | } |
4541 | ||
d6f42150 | 4542 | /* Setup the needed unix socket */ |
cf3af59e MD |
4543 | if ((ret = init_daemon_socket()) < 0) { |
4544 | goto exit; | |
fac6795d DG |
4545 | } |
4546 | ||
4547 | /* Set credentials to socket */ | |
be040666 | 4548 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4549 | goto exit; |
fac6795d DG |
4550 | } |
4551 | ||
5b8719f5 DG |
4552 | /* Get parent pid if -S, --sig-parent is specified. */ |
4553 | if (opt_sig_parent) { | |
4554 | ppid = getppid(); | |
4555 | } | |
4556 | ||
7a485870 | 4557 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4558 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4559 | goto exit; | |
7a485870 DG |
4560 | } |
4561 | ||
099e26bd DG |
4562 | /* Setup the thread apps communication pipe. */ |
4563 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4564 | goto exit; | |
4565 | } | |
4566 | ||
4567 | /* Init UST command queue. */ | |
4568 | cds_wfq_init(&ust_cmd_queue.queue); | |
4569 | ||
f6a9efaa DG |
4570 | /* Init UST app hash table */ |
4571 | ust_app_ht_alloc(); | |
4572 | ||
273ea72c | 4573 | /* |
54d01ffb DG |
4574 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4575 | * statically declared in session.c | |
273ea72c | 4576 | */ |
54d01ffb | 4577 | session_list_ptr = session_get_list(); |
b5541356 | 4578 | |
5eb91c98 DG |
4579 | /* Set up max poll set size */ |
4580 | lttng_poll_set_max_size(); | |
4581 | ||
cf3af59e | 4582 | /* Create thread to manage the client socket */ |
099e26bd DG |
4583 | ret = pthread_create(&client_thread, NULL, |
4584 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4585 | if (ret != 0) { |
76d7553f | 4586 | PERROR("pthread_create clients"); |
cf3af59e MD |
4587 | goto exit_client; |
4588 | } | |
fac6795d | 4589 | |
099e26bd DG |
4590 | /* Create thread to dispatch registration */ |
4591 | ret = pthread_create(&dispatch_thread, NULL, | |
4592 | thread_dispatch_ust_registration, (void *) NULL); | |
4593 | if (ret != 0) { | |
76d7553f | 4594 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4595 | goto exit_dispatch; |
4596 | } | |
4597 | ||
4598 | /* Create thread to manage application registration. */ | |
4599 | ret = pthread_create(®_apps_thread, NULL, | |
4600 | thread_registration_apps, (void *) NULL); | |
4601 | if (ret != 0) { | |
76d7553f | 4602 | PERROR("pthread_create registration"); |
099e26bd DG |
4603 | goto exit_reg_apps; |
4604 | } | |
4605 | ||
cf3af59e | 4606 | /* Create thread to manage application socket */ |
54d01ffb DG |
4607 | ret = pthread_create(&apps_thread, NULL, |
4608 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4609 | if (ret != 0) { |
76d7553f | 4610 | PERROR("pthread_create apps"); |
cf3af59e MD |
4611 | goto exit_apps; |
4612 | } | |
fac6795d | 4613 | |
cf3af59e | 4614 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4615 | ret = pthread_create(&kernel_thread, NULL, |
4616 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4617 | if (ret != 0) { |
76d7553f | 4618 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4619 | goto exit_kernel; |
4620 | } | |
7a485870 | 4621 | |
cf3af59e MD |
4622 | ret = pthread_join(kernel_thread, &status); |
4623 | if (ret != 0) { | |
76d7553f | 4624 | PERROR("pthread_join"); |
cf3af59e | 4625 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4626 | } |
4627 | ||
cf3af59e MD |
4628 | exit_kernel: |
4629 | ret = pthread_join(apps_thread, &status); | |
4630 | if (ret != 0) { | |
76d7553f | 4631 | PERROR("pthread_join"); |
cf3af59e MD |
4632 | goto error; /* join error, exit without cleanup */ |
4633 | } | |
fac6795d | 4634 | |
cf3af59e | 4635 | exit_apps: |
099e26bd DG |
4636 | ret = pthread_join(reg_apps_thread, &status); |
4637 | if (ret != 0) { | |
76d7553f | 4638 | PERROR("pthread_join"); |
099e26bd DG |
4639 | goto error; /* join error, exit without cleanup */ |
4640 | } | |
4641 | ||
4642 | exit_reg_apps: | |
4643 | ret = pthread_join(dispatch_thread, &status); | |
4644 | if (ret != 0) { | |
76d7553f | 4645 | PERROR("pthread_join"); |
099e26bd DG |
4646 | goto error; /* join error, exit without cleanup */ |
4647 | } | |
4648 | ||
4649 | exit_dispatch: | |
cf3af59e MD |
4650 | ret = pthread_join(client_thread, &status); |
4651 | if (ret != 0) { | |
76d7553f | 4652 | PERROR("pthread_join"); |
cf3af59e MD |
4653 | goto error; /* join error, exit without cleanup */ |
4654 | } | |
4655 | ||
3bd1e081 | 4656 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4657 | if (ret != 0) { |
76d7553f | 4658 | PERROR("join_consumer"); |
cf3af59e MD |
4659 | goto error; /* join error, exit without cleanup */ |
4660 | } | |
a88df331 | 4661 | |
cf3af59e | 4662 | exit_client: |
a88df331 | 4663 | exit: |
cf3af59e MD |
4664 | /* |
4665 | * cleanup() is called when no other thread is running. | |
4666 | */ | |
f6a9efaa | 4667 | rcu_thread_online(); |
cf3af59e | 4668 | cleanup(); |
f6a9efaa DG |
4669 | rcu_thread_offline(); |
4670 | rcu_unregister_thread(); | |
67e40797 | 4671 | if (!ret) { |
cf3af59e | 4672 | exit(EXIT_SUCCESS); |
67e40797 | 4673 | } |
cf3af59e | 4674 | error: |
5e16da05 | 4675 | exit(EXIT_FAILURE); |
fac6795d | 4676 | } |