Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
4771f025 | 53 | #include "kernel.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
3bd1e081 MD |
62 | struct consumer_data { |
63 | enum lttng_consumer_type type; | |
64 | ||
65 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
66 | sem_t sem; | |
67 | ||
68 | /* Mutex to control consumerd pid assignation */ | |
69 | pthread_mutex_t pid_mutex; | |
70 | pid_t pid; | |
71 | ||
72 | int err_sock; | |
73 | int cmd_sock; | |
74 | ||
75 | /* consumer error and command Unix socket path */ | |
76 | char err_unix_sock_path[PATH_MAX]; | |
77 | char cmd_unix_sock_path[PATH_MAX]; | |
78 | }; | |
79 | ||
75462a81 | 80 | /* Const values */ |
686204ab | 81 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 82 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
83 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
84 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
85 | ||
fac6795d | 86 | /* Variables */ |
1d4b027a | 87 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 88 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 89 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 90 | |
fac6795d DG |
91 | const char *progname; |
92 | const char *opt_tracing_group; | |
5b8719f5 | 93 | static int opt_sig_parent; |
fac6795d DG |
94 | static int opt_daemon; |
95 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 96 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
97 | |
98 | /* Consumer daemon specific control data */ | |
99 | static struct consumer_data kconsumer_data = { | |
100 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
101 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 103 | }; |
7753dea8 MD |
104 | static struct consumer_data ustconsumer64_data = { |
105 | .type = LTTNG_CONSUMER64_UST, | |
106 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
107 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
108 | }; | |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
111 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
112 | .cmd_unix_sock_path = 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 */ |
d6f42150 DG |
125 | static int client_sock; |
126 | static int apps_sock; | |
20fe2104 | 127 | static int kernel_tracer_fd; |
7a485870 | 128 | static int kernel_poll_pipe[2]; |
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 | */ | |
134 | static int thread_quit_pipe[2]; | |
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 | */ | |
140 | static int apps_cmd_pipe[2]; | |
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 | ||
fc7a59ce AM |
174 | static const char *consumerd32_bin = |
175 | __stringify(CONFIG_CONSUMERD32_BIN); | |
176 | static const char *consumerd64_bin = | |
177 | __stringify(CONFIG_CONSUMERD64_BIN); | |
ebaeda94 MD |
178 | static const char *consumerd32_libdir = |
179 | __stringify(CONFIG_CONSUMERD32_LIBDIR); | |
180 | static const char *consumerd64_libdir = | |
181 | __stringify(CONFIG_CONSUMERD64_LIBDIR); | |
fb09408a MD |
182 | |
183 | static | |
7753dea8 | 184 | void setup_consumerd_path(void) |
fb09408a | 185 | { |
fc7a59ce | 186 | const char *bin, *libdir; |
fb09408a | 187 | |
7753dea8 MD |
188 | /* |
189 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
190 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
191 | * has not been defined. | |
7753dea8 | 192 | */ |
ebaeda94 | 193 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
194 | if (!consumerd32_bin[0]) { |
195 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
196 | } |
197 | if (!consumerd32_libdir[0]) { | |
198 | consumerd32_libdir = INSTALL_LIB_PATH; | |
199 | } | |
200 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
201 | if (!consumerd64_bin[0]) { |
202 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 203 | } |
ebaeda94 MD |
204 | if (!consumerd64_libdir[0]) { |
205 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
206 | } |
207 | #else | |
208 | #error "Unknown bitness" | |
209 | #endif | |
210 | ||
fb09408a MD |
211 | /* |
212 | * runtime env. var. overrides the build default. | |
213 | */ | |
fc7a59ce AM |
214 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
215 | if (bin) { | |
216 | consumerd32_bin = bin; | |
7753dea8 | 217 | } |
fc7a59ce AM |
218 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
219 | if (bin) { | |
220 | consumerd64_bin = bin; | |
ebaeda94 MD |
221 | } |
222 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
223 | if (libdir) { | |
224 | consumerd32_libdir = libdir; | |
225 | } | |
226 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
227 | if (libdir) { | |
228 | consumerd64_libdir = libdir; | |
fb09408a MD |
229 | } |
230 | } | |
231 | ||
5eb91c98 DG |
232 | /* |
233 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
234 | */ | |
235 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
236 | unsigned int size) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | if (events == NULL || size == 0) { | |
241 | ret = -1; | |
242 | goto error; | |
243 | } | |
244 | ||
245 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
246 | if (ret < 0) { | |
247 | goto error; | |
248 | } | |
249 | ||
250 | /* Add quit pipe */ | |
251 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
252 | if (ret < 0) { | |
253 | goto error; | |
254 | } | |
255 | ||
256 | return 0; | |
257 | ||
258 | error: | |
259 | return ret; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Check if the thread quit pipe was triggered. | |
264 | * | |
265 | * Return 1 if it was triggered else 0; | |
266 | */ | |
267 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
268 | { | |
269 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
270 | return 1; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
0fdd1e2c DG |
276 | /* |
277 | * Remove modules in reverse load order. | |
278 | */ | |
279 | static int modprobe_remove_kernel_modules(void) | |
280 | { | |
281 | int ret = 0, i; | |
282 | char modprobe[256]; | |
283 | ||
284 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
285 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 286 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
287 | kernel_modules_list[i].name); |
288 | if (ret < 0) { | |
24b487b8 | 289 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
290 | goto error; |
291 | } | |
292 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
293 | ret = system(modprobe); | |
294 | if (ret == -1) { | |
24b487b8 | 295 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
296 | kernel_modules_list[i].name); |
297 | } else if (kernel_modules_list[i].required | |
298 | && WEXITSTATUS(ret) != 0) { | |
299 | ERR("Unable to remove module %s", | |
300 | kernel_modules_list[i].name); | |
301 | } else { | |
302 | DBG("Modprobe removal successful %s", | |
303 | kernel_modules_list[i].name); | |
304 | } | |
305 | } | |
306 | ||
307 | error: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Return group ID of the tracing group or -1 if not found. | |
313 | */ | |
996b65c8 MD |
314 | static gid_t allowed_group(void) |
315 | { | |
316 | struct group *grp; | |
317 | ||
274e143b MD |
318 | if (opt_tracing_group) { |
319 | grp = getgrnam(opt_tracing_group); | |
320 | } else { | |
321 | grp = getgrnam(default_tracing_group); | |
322 | } | |
996b65c8 MD |
323 | if (!grp) { |
324 | return -1; | |
325 | } else { | |
326 | return grp->gr_gid; | |
327 | } | |
328 | } | |
329 | ||
273ea72c | 330 | /* |
5eb91c98 | 331 | * Init thread quit pipe. |
273ea72c DG |
332 | * |
333 | * Return -1 on error or 0 if all pipes are created. | |
334 | */ | |
335 | static int init_thread_quit_pipe(void) | |
336 | { | |
337 | int ret; | |
338 | ||
339 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
340 | if (ret < 0) { | |
341 | perror("thread quit pipe"); | |
342 | goto error; | |
343 | } | |
344 | ||
345 | error: | |
346 | return ret; | |
347 | } | |
348 | ||
fac6795d | 349 | /* |
d063d709 DG |
350 | * Complete teardown of a kernel session. This free all data structure related |
351 | * to a kernel session and update counter. | |
fac6795d | 352 | */ |
1d4b027a | 353 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 354 | { |
8f7a84dd DG |
355 | if (!session->kernel_session) { |
356 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 357 | return; |
8f7a84dd DG |
358 | } |
359 | ||
84ea9c99 | 360 | DBG("Tearing down kernel session"); |
d9800920 | 361 | |
84ea9c99 MD |
362 | /* |
363 | * If a custom kernel consumer was registered, close the socket before | |
364 | * tearing down the complete kernel session structure | |
365 | */ | |
366 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
367 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 368 | } |
84ea9c99 MD |
369 | |
370 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
371 | } |
372 | ||
f6a9efaa DG |
373 | /* |
374 | * Complete teardown of all UST sessions. This will free everything on his path | |
375 | * and destroy the core essence of all ust sessions :) | |
376 | */ | |
377 | static void teardown_ust_session(struct ltt_session *session) | |
378 | { | |
84cd17c6 MD |
379 | int ret; |
380 | ||
8f7a84dd DG |
381 | if (!session->ust_session) { |
382 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 383 | return; |
8f7a84dd DG |
384 | } |
385 | ||
84ea9c99 | 386 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 387 | |
84cd17c6 MD |
388 | ret = ust_app_destroy_trace_all(session->ust_session); |
389 | if (ret) { | |
390 | ERR("Error in ust_app_destroy_trace_all"); | |
391 | } | |
8f7a84dd | 392 | |
f6a9efaa DG |
393 | trace_ust_destroy_session(session->ust_session); |
394 | } | |
395 | ||
099e26bd DG |
396 | /* |
397 | * Stop all threads by closing the thread quit pipe. | |
398 | */ | |
cf3af59e MD |
399 | static void stop_threads(void) |
400 | { | |
5eb91c98 DG |
401 | int ret; |
402 | ||
cf3af59e MD |
403 | /* Stopping all threads */ |
404 | DBG("Terminating all threads"); | |
54d01ffb | 405 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
406 | if (ret < 0) { |
407 | ERR("write error on thread quit pipe"); | |
408 | } | |
409 | ||
099e26bd DG |
410 | /* Dispatch thread */ |
411 | dispatch_thread_exit = 1; | |
412 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
413 | } |
414 | ||
fac6795d | 415 | /* |
d063d709 | 416 | * Cleanup the daemon |
fac6795d | 417 | */ |
cf3af59e | 418 | static void cleanup(void) |
fac6795d | 419 | { |
1d4b027a DG |
420 | int ret; |
421 | char *cmd; | |
af9737e9 | 422 | struct ltt_session *sess, *stmp; |
fac6795d | 423 | |
1d4b027a | 424 | DBG("Cleaning up"); |
e07ae692 | 425 | |
5eb91c98 DG |
426 | if (is_root) { |
427 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
428 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
429 | if (ret < 0) { | |
430 | ERR("asprintf failed. Something is really wrong!"); | |
431 | } | |
5461b305 | 432 | |
5eb91c98 DG |
433 | /* Remove lttng run directory */ |
434 | ret = system(cmd); | |
435 | if (ret < 0) { | |
436 | ERR("Unable to clean " LTTNG_RUNDIR); | |
437 | } | |
1d4b027a | 438 | } |
5461b305 | 439 | |
1d4b027a | 440 | DBG("Cleaning up all session"); |
fac6795d | 441 | |
b5541356 | 442 | /* Destroy session list mutex */ |
273ea72c DG |
443 | if (session_list_ptr != NULL) { |
444 | pthread_mutex_destroy(&session_list_ptr->lock); | |
445 | ||
446 | /* Cleanup ALL session */ | |
54d01ffb DG |
447 | cds_list_for_each_entry_safe(sess, stmp, |
448 | &session_list_ptr->head, list) { | |
273ea72c | 449 | teardown_kernel_session(sess); |
f6a9efaa DG |
450 | teardown_ust_session(sess); |
451 | free(sess); | |
273ea72c DG |
452 | } |
453 | } | |
454 | ||
099e26bd | 455 | DBG("Closing all UST sockets"); |
56fff090 | 456 | ust_app_clean_list(); |
099e26bd | 457 | |
3bd1e081 | 458 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 459 | |
f3ed775e | 460 | DBG("Closing kernel fd"); |
1d4b027a | 461 | close(kernel_tracer_fd); |
ab147185 | 462 | |
2f50c8a3 DG |
463 | if (is_root) { |
464 | DBG("Unloading kernel modules"); | |
465 | modprobe_remove_kernel_modules(); | |
466 | } | |
5eb91c98 DG |
467 | |
468 | close(thread_quit_pipe[0]); | |
469 | close(thread_quit_pipe[1]); | |
421cb601 DG |
470 | |
471 | /* <fun> */ | |
472 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
473 | "Matthew, BEET driven development works!%c[%dm", | |
474 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
475 | /* </fun> */ | |
fac6795d DG |
476 | } |
477 | ||
e065084a | 478 | /* |
d063d709 | 479 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 480 | * |
d063d709 | 481 | * Return lttcomm error code. |
e065084a DG |
482 | */ |
483 | static int send_unix_sock(int sock, void *buf, size_t len) | |
484 | { | |
485 | /* Check valid length */ | |
486 | if (len <= 0) { | |
487 | return -1; | |
488 | } | |
489 | ||
490 | return lttcomm_send_unix_sock(sock, buf, len); | |
491 | } | |
492 | ||
5461b305 | 493 | /* |
d063d709 | 494 | * Free memory of a command context structure. |
5461b305 | 495 | */ |
a2fb29a5 | 496 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 497 | { |
a2fb29a5 DG |
498 | DBG("Clean command context structure"); |
499 | if (*cmd_ctx) { | |
500 | if ((*cmd_ctx)->llm) { | |
501 | free((*cmd_ctx)->llm); | |
5461b305 | 502 | } |
a2fb29a5 DG |
503 | if ((*cmd_ctx)->lsm) { |
504 | free((*cmd_ctx)->lsm); | |
5461b305 | 505 | } |
a2fb29a5 DG |
506 | free(*cmd_ctx); |
507 | *cmd_ctx = NULL; | |
5461b305 DG |
508 | } |
509 | } | |
510 | ||
f3ed775e | 511 | /* |
d063d709 | 512 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 513 | */ |
2bdd86d4 | 514 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 515 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
516 | { |
517 | int ret; | |
f3ed775e | 518 | struct ltt_kernel_stream *stream; |
3bd1e081 | 519 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 520 | |
3bd1e081 | 521 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 522 | channel->channel->name); |
f3ed775e | 523 | |
3bd1e081 MD |
524 | /* Send channel */ |
525 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
526 | lkm.u.channel.channel_key = channel->fd; | |
527 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
528 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 529 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 530 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 531 | if (ret < 0) { |
3bd1e081 | 532 | perror("send consumer channel"); |
f3ed775e DG |
533 | goto error; |
534 | } | |
535 | ||
3bd1e081 | 536 | /* Send streams */ |
7a485870 | 537 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
538 | if (!stream->fd) { |
539 | continue; | |
540 | } | |
541 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
542 | lkm.u.stream.channel_key = channel->fd; | |
543 | lkm.u.stream.stream_key = stream->fd; | |
544 | lkm.u.stream.state = stream->state; | |
545 | lkm.u.stream.output = channel->channel->attr.output; | |
546 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
547 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
548 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
549 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
550 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
551 | if (ret < 0) { | |
552 | perror("send consumer stream"); | |
553 | goto error; | |
554 | } | |
555 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
556 | if (ret < 0) { | |
557 | perror("send consumer stream ancillary data"); | |
558 | goto error; | |
f3ed775e DG |
559 | } |
560 | } | |
561 | ||
3bd1e081 | 562 | DBG("consumer channel streams sent"); |
f3ed775e DG |
563 | |
564 | return 0; | |
565 | ||
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
570 | /* | |
d063d709 | 571 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 572 | */ |
2bdd86d4 | 573 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 574 | struct ltt_kernel_session *session) |
f3ed775e DG |
575 | { |
576 | int ret; | |
577 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
578 | struct lttcomm_consumer_msg lkm; |
579 | int sock = session->consumer_fd; | |
7a485870 DG |
580 | |
581 | DBG("Sending metadata stream fd"); | |
582 | ||
2bdd86d4 | 583 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 584 | if (session->consumer_fd == 0) { |
3bd1e081 | 585 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
586 | } |
587 | ||
7a485870 | 588 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
589 | /* Send metadata channel fd */ |
590 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
591 | lkm.u.channel.channel_key = session->metadata->fd; | |
592 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
593 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
594 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
595 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
596 | if (ret < 0) { | |
597 | perror("send consumer channel"); | |
598 | goto error; | |
599 | } | |
600 | ||
601 | /* Send metadata stream fd */ | |
602 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
603 | lkm.u.stream.channel_key = session->metadata->fd; | |
604 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
605 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
606 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
607 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
608 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
609 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
610 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
611 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
612 | if (ret < 0) { | |
613 | perror("send consumer stream"); | |
614 | goto error; | |
615 | } | |
616 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 617 | if (ret < 0) { |
3bd1e081 | 618 | perror("send consumer stream"); |
7a485870 DG |
619 | goto error; |
620 | } | |
621 | } | |
f3ed775e | 622 | |
f3ed775e | 623 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
624 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
625 | if (ret < 0) { | |
626 | goto error; | |
627 | } | |
628 | } | |
629 | ||
630 | DBG("consumer fds (metadata and channel streams) sent"); | |
631 | ||
632 | return 0; | |
633 | ||
634 | error: | |
635 | return ret; | |
636 | } | |
637 | ||
fac6795d | 638 | /* |
0fdd1e2c | 639 | * Notify UST applications using the shm mmap futex. |
fac6795d | 640 | */ |
0fdd1e2c | 641 | static int notify_ust_apps(int active) |
fac6795d | 642 | { |
0fdd1e2c | 643 | char *wait_shm_mmap; |
fac6795d | 644 | |
0fdd1e2c | 645 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 646 | |
0fdd1e2c DG |
647 | /* See shm.c for this call implying mmap, shm and futex calls */ |
648 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
649 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
650 | goto error; |
651 | } | |
652 | ||
0fdd1e2c DG |
653 | /* Wake waiting process */ |
654 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
655 | ||
656 | /* Apps notified successfully */ | |
657 | return 0; | |
fac6795d DG |
658 | |
659 | error: | |
0fdd1e2c | 660 | return -1; |
fac6795d DG |
661 | } |
662 | ||
e065084a | 663 | /* |
d063d709 DG |
664 | * Setup the outgoing data buffer for the response (llm) by allocating the |
665 | * right amount of memory and copying the original information from the lsm | |
666 | * structure. | |
ca95a216 | 667 | * |
d063d709 | 668 | * Return total size of the buffer pointed by buf. |
ca95a216 | 669 | */ |
5461b305 | 670 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 671 | { |
f3ed775e | 672 | int ret, buf_size; |
ca95a216 | 673 | |
f3ed775e | 674 | buf_size = size; |
5461b305 | 675 | |
ba7f0ae5 | 676 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 677 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 678 | perror("zmalloc"); |
5461b305 | 679 | ret = -ENOMEM; |
ca95a216 DG |
680 | goto error; |
681 | } | |
682 | ||
5461b305 DG |
683 | /* Copy common data */ |
684 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 685 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 686 | |
5461b305 DG |
687 | cmd_ctx->llm->data_size = size; |
688 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
689 | ||
ca95a216 DG |
690 | return buf_size; |
691 | ||
692 | error: | |
693 | return ret; | |
694 | } | |
695 | ||
7a485870 | 696 | /* |
5eb91c98 | 697 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 698 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 699 | */ |
5eb91c98 | 700 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 701 | { |
5eb91c98 | 702 | int ret; |
7a485870 DG |
703 | struct ltt_session *session; |
704 | struct ltt_kernel_channel *channel; | |
705 | ||
5eb91c98 | 706 | DBG("Updating kernel poll set"); |
7a485870 | 707 | |
54d01ffb | 708 | session_lock_list(); |
b5541356 | 709 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 710 | session_lock(session); |
7a485870 | 711 | if (session->kernel_session == NULL) { |
54d01ffb | 712 | session_unlock(session); |
7a485870 DG |
713 | continue; |
714 | } | |
7a485870 | 715 | |
54d01ffb DG |
716 | cds_list_for_each_entry(channel, |
717 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
718 | /* Add channel fd to the kernel poll set */ |
719 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
720 | if (ret < 0) { | |
54d01ffb | 721 | session_unlock(session); |
5eb91c98 DG |
722 | goto error; |
723 | } | |
724 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 725 | } |
54d01ffb | 726 | session_unlock(session); |
7a485870 | 727 | } |
54d01ffb | 728 | session_unlock_list(); |
7a485870 | 729 | |
5eb91c98 | 730 | return 0; |
7a485870 DG |
731 | |
732 | error: | |
54d01ffb | 733 | session_unlock_list(); |
7a485870 DG |
734 | return -1; |
735 | } | |
736 | ||
737 | /* | |
54d01ffb | 738 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 739 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 740 | * |
d063d709 | 741 | * Useful for CPU hotplug feature. |
7a485870 | 742 | */ |
2bdd86d4 | 743 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
744 | { |
745 | int ret = 0; | |
746 | struct ltt_session *session; | |
747 | struct ltt_kernel_channel *channel; | |
748 | ||
749 | DBG("Updating kernel streams for channel fd %d", fd); | |
750 | ||
54d01ffb | 751 | session_lock_list(); |
b5541356 | 752 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 753 | session_lock(session); |
7a485870 | 754 | if (session->kernel_session == NULL) { |
54d01ffb | 755 | session_unlock(session); |
7a485870 DG |
756 | continue; |
757 | } | |
d9800920 DG |
758 | |
759 | /* This is not suppose to be 0 but this is an extra security check */ | |
760 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 761 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
762 | } |
763 | ||
5eb91c98 DG |
764 | cds_list_for_each_entry(channel, |
765 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
766 | if (channel->fd == fd) { |
767 | DBG("Channel found, updating kernel streams"); | |
768 | ret = kernel_open_channel_stream(channel); | |
769 | if (ret < 0) { | |
b3c750d2 | 770 | goto error; |
7a485870 | 771 | } |
d9800920 | 772 | |
7a485870 | 773 | /* |
5eb91c98 DG |
774 | * Have we already sent fds to the consumer? If yes, it means |
775 | * that tracing is started so it is safe to send our updated | |
776 | * stream fds. | |
7a485870 | 777 | */ |
3bd1e081 | 778 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 779 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 780 | session->kernel_session->consumer_fd, channel); |
7a485870 | 781 | if (ret < 0) { |
b3c750d2 | 782 | goto error; |
7a485870 DG |
783 | } |
784 | } | |
b3c750d2 | 785 | goto error; |
7a485870 DG |
786 | } |
787 | } | |
54d01ffb | 788 | session_unlock(session); |
7a485870 | 789 | } |
54d01ffb | 790 | session_unlock_list(); |
b3c750d2 | 791 | return ret; |
7a485870 | 792 | |
b3c750d2 | 793 | error: |
54d01ffb DG |
794 | session_unlock(session); |
795 | session_unlock_list(); | |
7a485870 DG |
796 | return ret; |
797 | } | |
798 | ||
487cf67c DG |
799 | /* |
800 | * For each tracing session, update newly registered apps. | |
801 | */ | |
802 | static void update_ust_app(int app_sock) | |
803 | { | |
804 | struct ltt_session *sess, *stmp; | |
805 | ||
806 | /* For all tracing session(s) */ | |
807 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
808 | if (sess->ust_session) { |
809 | ust_app_global_update(sess->ust_session, app_sock); | |
810 | } | |
487cf67c DG |
811 | } |
812 | } | |
813 | ||
7a485870 | 814 | /* |
d063d709 | 815 | * This thread manage event coming from the kernel. |
7a485870 | 816 | * |
d063d709 DG |
817 | * Features supported in this thread: |
818 | * -) CPU Hotplug | |
7a485870 DG |
819 | */ |
820 | static void *thread_manage_kernel(void *data) | |
821 | { | |
5eb91c98 DG |
822 | int ret, i, pollfd, update_poll_flag = 1; |
823 | uint32_t revents, nb_fd; | |
7a485870 | 824 | char tmp; |
5eb91c98 | 825 | struct lttng_poll_event events; |
7a485870 DG |
826 | |
827 | DBG("Thread manage kernel started"); | |
828 | ||
5eb91c98 DG |
829 | ret = create_thread_poll_set(&events, 2); |
830 | if (ret < 0) { | |
831 | goto error; | |
832 | } | |
833 | ||
834 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
835 | if (ret < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
7a485870 DG |
839 | while (1) { |
840 | if (update_poll_flag == 1) { | |
5f822d0a DG |
841 | /* |
842 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
843 | * quit pipe and the kernel pipe. | |
844 | */ | |
845 | events.nb_fd = 2; | |
846 | ||
5eb91c98 DG |
847 | ret = update_kernel_poll(&events); |
848 | if (ret < 0) { | |
7a485870 DG |
849 | goto error; |
850 | } | |
851 | update_poll_flag = 0; | |
852 | } | |
853 | ||
5eb91c98 DG |
854 | nb_fd = LTTNG_POLL_GETNB(&events); |
855 | ||
856 | DBG("Thread kernel polling on %d fds", nb_fd); | |
857 | ||
858 | /* Zeroed the poll events */ | |
859 | lttng_poll_reset(&events); | |
7a485870 DG |
860 | |
861 | /* Poll infinite value of time */ | |
5eb91c98 | 862 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 863 | if (ret < 0) { |
7a485870 DG |
864 | goto error; |
865 | } else if (ret == 0) { | |
866 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
867 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
868 | "This should not have happened! Continuing..."); | |
7a485870 DG |
869 | continue; |
870 | } | |
871 | ||
5eb91c98 DG |
872 | for (i = 0; i < nb_fd; i++) { |
873 | /* Fetch once the poll data */ | |
874 | revents = LTTNG_POLL_GETEV(&events, i); | |
875 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 876 | |
5eb91c98 DG |
877 | /* Thread quit pipe has been closed. Killing thread. */ |
878 | ret = check_thread_quit_pipe(pollfd, revents); | |
879 | if (ret) { | |
880 | goto error; | |
881 | } | |
7a485870 | 882 | |
5eb91c98 DG |
883 | /* Check for data on kernel pipe */ |
884 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
885 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
886 | update_poll_flag = 1; | |
887 | continue; | |
888 | } else { | |
889 | /* | |
890 | * New CPU detected by the kernel. Adding kernel stream to | |
891 | * kernel session and updating the kernel consumer | |
892 | */ | |
893 | if (revents & LPOLLIN) { | |
2bdd86d4 | 894 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
895 | if (ret < 0) { |
896 | continue; | |
897 | } | |
898 | break; | |
899 | /* | |
900 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
901 | * and unregister kernel stream at this point. | |
902 | */ | |
7a485870 | 903 | } |
7a485870 DG |
904 | } |
905 | } | |
906 | } | |
907 | ||
908 | error: | |
909 | DBG("Kernel thread dying"); | |
273ea72c DG |
910 | close(kernel_poll_pipe[0]); |
911 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
912 | |
913 | lttng_poll_clean(&events); | |
914 | ||
7a485870 DG |
915 | return NULL; |
916 | } | |
917 | ||
1d4b027a | 918 | /* |
3bd1e081 | 919 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 920 | */ |
3bd1e081 | 921 | static void *thread_manage_consumer(void *data) |
1d4b027a | 922 | { |
5eb91c98 DG |
923 | int sock = 0, i, ret, pollfd; |
924 | uint32_t revents, nb_fd; | |
1d4b027a | 925 | enum lttcomm_return_code code; |
5eb91c98 | 926 | struct lttng_poll_event events; |
3bd1e081 | 927 | struct consumer_data *consumer_data = data; |
1d4b027a | 928 | |
3bd1e081 | 929 | DBG("[thread] Manage consumer started"); |
1d4b027a | 930 | |
3bd1e081 | 931 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
932 | if (ret < 0) { |
933 | goto error; | |
934 | } | |
935 | ||
5eb91c98 DG |
936 | /* |
937 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
938 | * Nothing more will be added to this poll set. | |
939 | */ | |
940 | ret = create_thread_poll_set(&events, 2); | |
941 | if (ret < 0) { | |
942 | goto error; | |
943 | } | |
273ea72c | 944 | |
3bd1e081 | 945 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
946 | if (ret < 0) { |
947 | goto error; | |
948 | } | |
949 | ||
950 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
951 | |
952 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 953 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 954 | if (ret < 0) { |
273ea72c DG |
955 | goto error; |
956 | } | |
957 | ||
5eb91c98 DG |
958 | for (i = 0; i < nb_fd; i++) { |
959 | /* Fetch once the poll data */ | |
960 | revents = LTTNG_POLL_GETEV(&events, i); | |
961 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
962 | ||
963 | /* Thread quit pipe has been closed. Killing thread. */ | |
964 | ret = check_thread_quit_pipe(pollfd, revents); | |
965 | if (ret) { | |
966 | goto error; | |
967 | } | |
968 | ||
969 | /* Event on the registration socket */ | |
3bd1e081 | 970 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 971 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 972 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
973 | goto error; |
974 | } | |
975 | } | |
273ea72c DG |
976 | } |
977 | ||
3bd1e081 | 978 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
979 | if (sock < 0) { |
980 | goto error; | |
981 | } | |
982 | ||
3bd1e081 | 983 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 984 | |
712ea556 | 985 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
986 | ret = lttcomm_recv_unix_sock(sock, &code, |
987 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
988 | if (ret <= 0) { |
989 | goto error; | |
990 | } | |
991 | ||
3bd1e081 MD |
992 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
993 | consumer_data->cmd_sock = | |
994 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
995 | if (consumer_data->cmd_sock < 0) { | |
996 | sem_post(&consumer_data->sem); | |
48842b30 | 997 | PERROR("consumer connect"); |
1d4b027a DG |
998 | goto error; |
999 | } | |
1000 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1001 | sem_post(&consumer_data->sem); |
1002 | DBG("consumer command socket ready"); | |
1d4b027a | 1003 | } else { |
3bd1e081 | 1004 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1005 | lttcomm_get_readable_code(-code)); |
1006 | goto error; | |
1007 | } | |
1008 | ||
54d01ffb | 1009 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1010 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1011 | if (ret < 0) { |
72079cae DG |
1012 | goto error; |
1013 | } | |
1014 | ||
5eb91c98 DG |
1015 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1016 | if (ret < 0) { | |
72079cae | 1017 | goto error; |
5eb91c98 DG |
1018 | } |
1019 | ||
1020 | /* Update number of fd */ | |
1021 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1022 | ||
1023 | /* Inifinite blocking call, waiting for transmission */ | |
1024 | ret = lttng_poll_wait(&events, -1); | |
1025 | if (ret < 0) { | |
72079cae DG |
1026 | goto error; |
1027 | } | |
1028 | ||
5eb91c98 DG |
1029 | for (i = 0; i < nb_fd; i++) { |
1030 | /* Fetch once the poll data */ | |
1031 | revents = LTTNG_POLL_GETEV(&events, i); | |
1032 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1033 | ||
1034 | /* Thread quit pipe has been closed. Killing thread. */ | |
1035 | ret = check_thread_quit_pipe(pollfd, revents); | |
1036 | if (ret) { | |
1037 | goto error; | |
1038 | } | |
1039 | ||
1040 | /* Event on the kconsumerd socket */ | |
1041 | if (pollfd == sock) { | |
1042 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1043 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1044 | goto error; |
1045 | } | |
1046 | } | |
1047 | } | |
1048 | ||
712ea556 | 1049 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1050 | ret = lttcomm_recv_unix_sock(sock, &code, |
1051 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1052 | if (ret <= 0) { |
3bd1e081 | 1053 | ERR("consumer closed the command socket"); |
712ea556 | 1054 | goto error; |
6f61d021 | 1055 | } |
1d4b027a | 1056 | |
3bd1e081 | 1057 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1058 | |
1d4b027a | 1059 | error: |
3bd1e081 MD |
1060 | DBG("consumer thread dying"); |
1061 | close(consumer_data->err_sock); | |
1062 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1063 | close(sock); |
273ea72c | 1064 | |
3bd1e081 MD |
1065 | unlink(consumer_data->err_unix_sock_path); |
1066 | unlink(consumer_data->cmd_unix_sock_path); | |
1067 | consumer_data->pid = 0; | |
1d4b027a | 1068 | |
5eb91c98 | 1069 | lttng_poll_clean(&events); |
0177d773 | 1070 | |
5eb91c98 | 1071 | return NULL; |
099e26bd DG |
1072 | } |
1073 | ||
099e26bd DG |
1074 | /* |
1075 | * This thread manage application communication. | |
1d4b027a DG |
1076 | */ |
1077 | static void *thread_manage_apps(void *data) | |
099e26bd | 1078 | { |
5eb91c98 DG |
1079 | int i, ret, pollfd; |
1080 | uint32_t revents, nb_fd; | |
099e26bd | 1081 | struct ust_command ust_cmd; |
5eb91c98 | 1082 | struct lttng_poll_event events; |
099e26bd DG |
1083 | |
1084 | DBG("[thread] Manage application started"); | |
1085 | ||
f6a9efaa DG |
1086 | rcu_register_thread(); |
1087 | rcu_thread_online(); | |
1088 | ||
5eb91c98 DG |
1089 | ret = create_thread_poll_set(&events, 2); |
1090 | if (ret < 0) { | |
1091 | goto error; | |
1092 | } | |
099e26bd | 1093 | |
5eb91c98 DG |
1094 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1095 | if (ret < 0) { | |
1096 | goto error; | |
1097 | } | |
099e26bd | 1098 | |
5eb91c98 DG |
1099 | while (1) { |
1100 | /* Zeroed the events structure */ | |
1101 | lttng_poll_reset(&events); | |
0177d773 | 1102 | |
5eb91c98 | 1103 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1104 | |
1105 | DBG("Apps thread polling on %d fds", nb_fd); | |
1106 | ||
1107 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1108 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1109 | if (ret < 0) { |
099e26bd DG |
1110 | goto error; |
1111 | } | |
1112 | ||
5eb91c98 DG |
1113 | for (i = 0; i < nb_fd; i++) { |
1114 | /* Fetch once the poll data */ | |
1115 | revents = LTTNG_POLL_GETEV(&events, i); | |
1116 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1117 | ||
1118 | /* Thread quit pipe has been closed. Killing thread. */ | |
1119 | ret = check_thread_quit_pipe(pollfd, revents); | |
1120 | if (ret) { | |
099e26bd | 1121 | goto error; |
5eb91c98 | 1122 | } |
099e26bd | 1123 | |
5eb91c98 DG |
1124 | /* Inspect the apps cmd pipe */ |
1125 | if (pollfd == apps_cmd_pipe[0]) { | |
1126 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1127 | ERR("Apps command pipe error"); | |
0177d773 | 1128 | goto error; |
5eb91c98 DG |
1129 | } else if (revents & LPOLLIN) { |
1130 | /* Empty pipe */ | |
1131 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1132 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1133 | perror("read apps cmd pipe"); | |
1134 | goto error; | |
1135 | } | |
099e26bd | 1136 | |
5eb91c98 | 1137 | /* Register applicaton to the session daemon */ |
56fff090 | 1138 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1139 | ust_cmd.sock); |
88ff5b7f | 1140 | if (ret == -ENOMEM) { |
5eb91c98 | 1141 | goto error; |
88ff5b7f MD |
1142 | } else if (ret < 0) { |
1143 | break; | |
5eb91c98 DG |
1144 | } |
1145 | ||
acc7b41b MD |
1146 | /* |
1147 | * Add channel(s) and event(s) to newly registered apps | |
1148 | * from lttng global UST domain. | |
1149 | */ | |
1150 | update_ust_app(ust_cmd.sock); | |
1151 | ||
5eb91c98 DG |
1152 | ret = ustctl_register_done(ust_cmd.sock); |
1153 | if (ret < 0) { | |
1154 | /* | |
1155 | * If the registration is not possible, we simply | |
1156 | * unregister the apps and continue | |
1157 | */ | |
56fff090 | 1158 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1159 | } else { |
1160 | /* | |
1161 | * We just need here to monitor the close of the UST | |
1162 | * socket and poll set monitor those by default. | |
1163 | */ | |
1164 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1165 | if (ret < 0) { | |
1166 | goto error; | |
1167 | } | |
1168 | ||
54d01ffb DG |
1169 | DBG("Apps with sock %d added to poll set", |
1170 | ust_cmd.sock); | |
5eb91c98 | 1171 | } |
487cf67c | 1172 | |
5eb91c98 | 1173 | break; |
0177d773 | 1174 | } |
5eb91c98 DG |
1175 | } else { |
1176 | /* | |
54d01ffb DG |
1177 | * At this point, we know that a registered application made |
1178 | * the event at poll_wait. | |
5eb91c98 DG |
1179 | */ |
1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1181 | /* Removing from the poll set */ | |
1182 | ret = lttng_poll_del(&events, pollfd); | |
1183 | if (ret < 0) { | |
1184 | goto error; | |
1185 | } | |
099e26bd | 1186 | |
b9d9b220 | 1187 | /* Socket closed on remote end. */ |
56fff090 | 1188 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1189 | break; |
1190 | } | |
099e26bd DG |
1191 | } |
1192 | } | |
099e26bd DG |
1193 | } |
1194 | ||
1195 | error: | |
1196 | DBG("Application communication apps dying"); | |
1197 | close(apps_cmd_pipe[0]); | |
1198 | close(apps_cmd_pipe[1]); | |
1199 | ||
5eb91c98 | 1200 | lttng_poll_clean(&events); |
099e26bd | 1201 | |
f6a9efaa DG |
1202 | rcu_thread_offline(); |
1203 | rcu_unregister_thread(); | |
099e26bd DG |
1204 | return NULL; |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Dispatch request from the registration threads to the application | |
1209 | * communication thread. | |
1210 | */ | |
1211 | static void *thread_dispatch_ust_registration(void *data) | |
1212 | { | |
1213 | int ret; | |
1214 | struct cds_wfq_node *node; | |
1215 | struct ust_command *ust_cmd = NULL; | |
1216 | ||
1217 | DBG("[thread] Dispatch UST command started"); | |
1218 | ||
1219 | while (!dispatch_thread_exit) { | |
1220 | /* Atomically prepare the queue futex */ | |
1221 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1222 | ||
1223 | do { | |
1224 | /* Dequeue command for registration */ | |
1225 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1226 | if (node == NULL) { | |
00a17c97 | 1227 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1228 | /* Continue thread execution */ |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1233 | ||
2f50c8a3 DG |
1234 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1235 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1236 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1237 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1238 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1239 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1240 | /* |
1241 | * Inform apps thread of the new application registration. This | |
1242 | * call is blocking so we can be assured that the data will be read | |
1243 | * at some point in time or wait to the end of the world :) | |
1244 | */ | |
1245 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1246 | sizeof(struct ust_command)); | |
1247 | if (ret < 0) { | |
1248 | perror("write apps cmd pipe"); | |
1249 | if (errno == EBADF) { | |
1250 | /* | |
1251 | * We can't inform the application thread to process | |
1252 | * registration. We will exit or else application | |
1253 | * registration will not occur and tracing will never | |
1254 | * start. | |
1255 | */ | |
1256 | goto error; | |
1257 | } | |
1258 | } | |
1259 | free(ust_cmd); | |
1260 | } while (node != NULL); | |
1261 | ||
1262 | /* Futex wait on queue. Blocking call on futex() */ | |
1263 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1264 | } | |
1265 | ||
1266 | error: | |
1267 | DBG("Dispatch thread dying"); | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * This thread manage application registration. | |
1273 | */ | |
1274 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1275 | { |
5eb91c98 DG |
1276 | int sock = 0, i, ret, pollfd; |
1277 | uint32_t revents, nb_fd; | |
1278 | struct lttng_poll_event events; | |
099e26bd DG |
1279 | /* |
1280 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1281 | * freed in the manage apps thread. | |
1282 | */ | |
1283 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1284 | |
099e26bd | 1285 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1286 | |
1287 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1288 | if (ret < 0) { | |
1289 | goto error; | |
1290 | } | |
1291 | ||
5eb91c98 DG |
1292 | /* |
1293 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1294 | * more will be added to this poll set. | |
1295 | */ | |
1296 | ret = create_thread_poll_set(&events, 2); | |
1297 | if (ret < 0) { | |
1298 | goto error; | |
1299 | } | |
273ea72c | 1300 | |
5eb91c98 DG |
1301 | /* Add the application registration socket */ |
1302 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1303 | if (ret < 0) { | |
1304 | goto error; | |
1305 | } | |
273ea72c | 1306 | |
1d4b027a | 1307 | /* Notify all applications to register */ |
0fdd1e2c DG |
1308 | ret = notify_ust_apps(1); |
1309 | if (ret < 0) { | |
1310 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1311 | "Execution continues but there might be problem for already\n" |
1312 | "running applications that wishes to register."); | |
0fdd1e2c | 1313 | } |
1d4b027a DG |
1314 | |
1315 | while (1) { | |
1316 | DBG("Accepting application registration"); | |
273ea72c | 1317 | |
5eb91c98 DG |
1318 | nb_fd = LTTNG_POLL_GETNB(&events); |
1319 | ||
273ea72c | 1320 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1321 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1322 | if (ret < 0) { |
273ea72c DG |
1323 | goto error; |
1324 | } | |
1325 | ||
5eb91c98 DG |
1326 | for (i = 0; i < nb_fd; i++) { |
1327 | /* Fetch once the poll data */ | |
1328 | revents = LTTNG_POLL_GETEV(&events, i); | |
1329 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1330 | |
5eb91c98 DG |
1331 | /* Thread quit pipe has been closed. Killing thread. */ |
1332 | ret = check_thread_quit_pipe(pollfd, revents); | |
1333 | if (ret) { | |
90014c57 DG |
1334 | goto error; |
1335 | } | |
1d4b027a | 1336 | |
5eb91c98 DG |
1337 | /* Event on the registration socket */ |
1338 | if (pollfd == apps_sock) { | |
1339 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1340 | ERR("Register apps socket poll error"); | |
1341 | goto error; | |
1342 | } else if (revents & LPOLLIN) { | |
1343 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1344 | if (sock < 0) { | |
1345 | goto error; | |
1346 | } | |
099e26bd | 1347 | |
5eb91c98 | 1348 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1349 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1350 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1351 | perror("ust command zmalloc"); |
5eb91c98 DG |
1352 | goto error; |
1353 | } | |
1d4b027a | 1354 | |
5eb91c98 DG |
1355 | /* |
1356 | * Using message-based transmissions to ensure we don't | |
1357 | * have to deal with partially received messages. | |
1358 | */ | |
1359 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1360 | sizeof(struct ust_register_msg)); | |
1361 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1362 | if (ret < 0) { | |
1363 | perror("lttcomm_recv_unix_sock register apps"); | |
1364 | } else { | |
1365 | ERR("Wrong size received on apps register"); | |
1366 | } | |
1367 | free(ust_cmd); | |
1368 | close(sock); | |
1369 | continue; | |
1370 | } | |
099e26bd | 1371 | |
5eb91c98 | 1372 | ust_cmd->sock = sock; |
099e26bd | 1373 | |
5eb91c98 DG |
1374 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1375 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1376 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1377 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1378 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1379 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1380 | |
5eb91c98 DG |
1381 | /* |
1382 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1383 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1384 | */ |
1385 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1386 | ||
1387 | /* | |
1388 | * Wake the registration queue futex. Implicit memory | |
1389 | * barrier with the exchange in cds_wfq_enqueue. | |
1390 | */ | |
1391 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1392 | } | |
1393 | } | |
90014c57 | 1394 | } |
1d4b027a DG |
1395 | } |
1396 | ||
1397 | error: | |
0fdd1e2c DG |
1398 | DBG("UST Registration thread dying"); |
1399 | ||
1400 | /* Notify that the registration thread is gone */ | |
1401 | notify_ust_apps(0); | |
1402 | ||
1403 | close(apps_sock); | |
1404 | close(sock); | |
273ea72c | 1405 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1406 | |
5eb91c98 DG |
1407 | lttng_poll_clean(&events); |
1408 | ||
1d4b027a DG |
1409 | return NULL; |
1410 | } | |
1411 | ||
8c0faa1d | 1412 | /* |
3bd1e081 | 1413 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1414 | * exec or it will fails. |
8c0faa1d | 1415 | */ |
3bd1e081 | 1416 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1417 | { |
1418 | int ret; | |
ee0b0061 DG |
1419 | struct timespec timeout; |
1420 | ||
1421 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1422 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1423 | |
1424 | /* Setup semaphore */ | |
3bd1e081 | 1425 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1426 | if (ret < 0) { |
3bd1e081 | 1427 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1428 | goto error; |
1429 | } | |
8c0faa1d | 1430 | |
3bd1e081 MD |
1431 | ret = pthread_create(&consumer_data->thread, NULL, |
1432 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1433 | if (ret != 0) { |
3bd1e081 | 1434 | PERROR("pthread_create consumer"); |
ee0b0061 | 1435 | ret = -1; |
8c0faa1d DG |
1436 | goto error; |
1437 | } | |
1438 | ||
ee0b0061 DG |
1439 | /* Get time for sem_timedwait absolute timeout */ |
1440 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1441 | if (ret < 0) { | |
3bd1e081 | 1442 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1443 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1444 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1445 | } else { |
1446 | /* Normal timeout if the gettime was successful */ | |
1447 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1448 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1449 | } |
8c0faa1d | 1450 | |
ee0b0061 DG |
1451 | if (ret < 0) { |
1452 | if (errno == ETIMEDOUT) { | |
1453 | /* | |
1454 | * Call has timed out so we kill the kconsumerd_thread and return | |
1455 | * an error. | |
1456 | */ | |
3bd1e081 MD |
1457 | ERR("The consumer thread was never ready. Killing it"); |
1458 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1459 | if (ret < 0) { |
3bd1e081 | 1460 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1461 | } |
1462 | } else { | |
3bd1e081 | 1463 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1464 | } |
1465 | goto error; | |
1466 | } | |
1467 | ||
3bd1e081 MD |
1468 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1469 | if (consumer_data->pid == 0) { | |
712ea556 | 1470 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1471 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1472 | goto error; |
1473 | } | |
3bd1e081 | 1474 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1475 | |
8c0faa1d DG |
1476 | return 0; |
1477 | ||
1478 | error: | |
1479 | return ret; | |
1480 | } | |
1481 | ||
d9800920 | 1482 | /* |
3bd1e081 | 1483 | * Join consumer thread |
d9800920 | 1484 | */ |
3bd1e081 | 1485 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1486 | { |
1487 | void *status; | |
1488 | int ret; | |
1489 | ||
3bd1e081 MD |
1490 | if (consumer_data->pid != 0) { |
1491 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1492 | if (ret) { |
3bd1e081 | 1493 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1494 | return ret; |
1495 | } | |
3bd1e081 | 1496 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1497 | } else { |
1498 | return 0; | |
1499 | } | |
1500 | } | |
1501 | ||
8c0faa1d | 1502 | /* |
3bd1e081 | 1503 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1504 | * |
d063d709 | 1505 | * Return pid if successful else -1. |
8c0faa1d | 1506 | */ |
3bd1e081 | 1507 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1508 | { |
1509 | int ret; | |
1510 | pid_t pid; | |
94c55f17 | 1511 | const char *consumer_to_use; |
53086306 | 1512 | const char *verbosity; |
94c55f17 | 1513 | struct stat st; |
8c0faa1d | 1514 | |
3bd1e081 | 1515 | DBG("Spawning consumerd"); |
c49dc785 | 1516 | |
8c0faa1d DG |
1517 | pid = fork(); |
1518 | if (pid == 0) { | |
1519 | /* | |
3bd1e081 | 1520 | * Exec consumerd. |
8c0faa1d | 1521 | */ |
3bd1e081 | 1522 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1523 | verbosity = "--verbose"; |
1524 | } else { | |
1525 | verbosity = "--quiet"; | |
1526 | } | |
3bd1e081 MD |
1527 | switch (consumer_data->type) { |
1528 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1529 | /* |
f806231f MD |
1530 | * Find out which consumerd to execute. We will |
1531 | * first try the 64-bit path, then the | |
1532 | * sessiond's installation directory, and | |
1533 | * fallback on the 32-bit one, | |
94c55f17 AM |
1534 | */ |
1535 | if (stat(consumerd64_bin, &st) == 0) { | |
1536 | consumer_to_use = consumerd64_bin; | |
94c55f17 AM |
1537 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
1538 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
eb1e0bd4 MD |
1539 | } else if (stat(consumerd32_bin, &st) == 0) { |
1540 | consumer_to_use = consumerd32_bin; | |
94c55f17 AM |
1541 | } else { |
1542 | break; | |
1543 | } | |
1544 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1545 | execl(consumer_to_use, | |
1546 | "lttng-consumerd", verbosity, "-k", | |
1547 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1548 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1549 | NULL); | |
3bd1e081 | 1550 | break; |
7753dea8 MD |
1551 | case LTTNG_CONSUMER64_UST: |
1552 | { | |
b1e0b6b6 | 1553 | char *tmpnew = NULL; |
8f4905da MD |
1554 | |
1555 | if (consumerd64_libdir[0] != '\0') { | |
1556 | char *tmp; | |
1557 | size_t tmplen; | |
1558 | ||
1559 | tmp = getenv("LD_LIBRARY_PATH"); | |
1560 | if (!tmp) { | |
1561 | tmp = ""; | |
1562 | } | |
1563 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1564 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1565 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1566 | if (!tmpnew) { | |
1567 | ret = -ENOMEM; | |
1568 | goto error; | |
1569 | } | |
1570 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1571 | strcat(tmpnew, consumerd64_libdir); | |
1572 | if (tmp[0] != '\0') { | |
1573 | strcat(tmpnew, ":"); | |
1574 | strcat(tmpnew, tmp); | |
1575 | } | |
1576 | ret = putenv(tmpnew); | |
1577 | if (ret) { | |
1578 | ret = -errno; | |
1579 | goto error; | |
1580 | } | |
1581 | } | |
94c55f17 | 1582 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
fc7a59ce | 1583 | ret = execl(consumerd64_bin, verbosity, "-u", |
7753dea8 MD |
1584 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1585 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1586 | NULL); | |
8f4905da MD |
1587 | if (consumerd64_libdir[0] != '\0') { |
1588 | free(tmpnew); | |
1589 | } | |
1590 | if (ret) { | |
1591 | goto error; | |
1592 | } | |
3bd1e081 | 1593 | break; |
7753dea8 MD |
1594 | } |
1595 | case LTTNG_CONSUMER32_UST: | |
1596 | { | |
937dde8e | 1597 | char *tmpnew = NULL; |
8f4905da MD |
1598 | |
1599 | if (consumerd32_libdir[0] != '\0') { | |
1600 | char *tmp; | |
1601 | size_t tmplen; | |
1602 | ||
1603 | tmp = getenv("LD_LIBRARY_PATH"); | |
1604 | if (!tmp) { | |
1605 | tmp = ""; | |
1606 | } | |
1607 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1608 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1609 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1610 | if (!tmpnew) { | |
1611 | ret = -ENOMEM; | |
1612 | goto error; | |
1613 | } | |
1614 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1615 | strcat(tmpnew, consumerd32_libdir); | |
1616 | if (tmp[0] != '\0') { | |
1617 | strcat(tmpnew, ":"); | |
1618 | strcat(tmpnew, tmp); | |
1619 | } | |
1620 | ret = putenv(tmpnew); | |
1621 | if (ret) { | |
1622 | ret = -errno; | |
1623 | goto error; | |
1624 | } | |
1625 | } | |
94c55f17 | 1626 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
fc7a59ce | 1627 | ret = execl(consumerd32_bin, verbosity, "-u", |
7753dea8 MD |
1628 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1629 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1630 | NULL); | |
8f4905da MD |
1631 | if (consumerd32_libdir[0] != '\0') { |
1632 | free(tmpnew); | |
1633 | } | |
1634 | if (ret) { | |
1635 | goto error; | |
1636 | } | |
7753dea8 MD |
1637 | break; |
1638 | } | |
3bd1e081 MD |
1639 | default: |
1640 | perror("unknown consumer type"); | |
1641 | exit(EXIT_FAILURE); | |
1642 | } | |
8c0faa1d DG |
1643 | if (errno != 0) { |
1644 | perror("kernel start consumer exec"); | |
1645 | } | |
1646 | exit(EXIT_FAILURE); | |
1647 | } else if (pid > 0) { | |
1648 | ret = pid; | |
8c0faa1d | 1649 | } else { |
3bd1e081 | 1650 | perror("start consumer fork"); |
8c0faa1d | 1651 | ret = -errno; |
8c0faa1d | 1652 | } |
8f4905da | 1653 | error: |
8c0faa1d DG |
1654 | return ret; |
1655 | } | |
1656 | ||
693bd40b | 1657 | /* |
3bd1e081 | 1658 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1659 | */ |
3bd1e081 | 1660 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1661 | { |
1662 | int ret; | |
1663 | ||
3bd1e081 MD |
1664 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1665 | if (consumer_data->pid != 0) { | |
1666 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1667 | goto end; |
1668 | } | |
693bd40b | 1669 | |
3bd1e081 | 1670 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1671 | if (ret < 0) { |
3bd1e081 MD |
1672 | ERR("Spawning consumerd failed"); |
1673 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1674 | goto error; |
693bd40b | 1675 | } |
c49dc785 | 1676 | |
3bd1e081 MD |
1677 | /* Setting up the consumer_data pid */ |
1678 | consumer_data->pid = ret; | |
48842b30 | 1679 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1680 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1681 | |
3bd1e081 MD |
1682 | DBG2("Spawning consumer control thread"); |
1683 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1684 | if (ret < 0) { |
3bd1e081 | 1685 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1686 | goto error; |
1687 | } | |
1688 | ||
c49dc785 | 1689 | end: |
693bd40b DG |
1690 | return 0; |
1691 | ||
1692 | error: | |
1693 | return ret; | |
1694 | } | |
1695 | ||
b73401da | 1696 | /* |
d063d709 | 1697 | * modprobe_kernel_modules |
b73401da DG |
1698 | */ |
1699 | static int modprobe_kernel_modules(void) | |
1700 | { | |
ab147185 | 1701 | int ret = 0, i; |
b73401da DG |
1702 | char modprobe[256]; |
1703 | ||
ab147185 MD |
1704 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1705 | ret = snprintf(modprobe, sizeof(modprobe), | |
1706 | "/sbin/modprobe %s%s", | |
24b487b8 | 1707 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1708 | kernel_modules_list[i].name); |
b73401da DG |
1709 | if (ret < 0) { |
1710 | perror("snprintf modprobe"); | |
1711 | goto error; | |
1712 | } | |
ab147185 | 1713 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1714 | ret = system(modprobe); |
ab147185 MD |
1715 | if (ret == -1) { |
1716 | ERR("Unable to launch modprobe for module %s", | |
1717 | kernel_modules_list[i].name); | |
1718 | } else if (kernel_modules_list[i].required | |
d9800920 | 1719 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1720 | ERR("Unable to load module %s", |
1721 | kernel_modules_list[i].name); | |
1722 | } else { | |
1723 | DBG("Modprobe successfully %s", | |
1724 | kernel_modules_list[i].name); | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | error: | |
1729 | return ret; | |
1730 | } | |
1731 | ||
b73401da | 1732 | /* |
d063d709 | 1733 | * mount_debugfs |
b73401da DG |
1734 | */ |
1735 | static int mount_debugfs(char *path) | |
1736 | { | |
1737 | int ret; | |
1738 | char *type = "debugfs"; | |
1739 | ||
996b65c8 | 1740 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1741 | if (ret < 0) { |
7272acf5 | 1742 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1743 | goto error; |
1744 | } | |
1745 | ||
1746 | ret = mount(type, path, type, 0, NULL); | |
1747 | if (ret < 0) { | |
7272acf5 | 1748 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1749 | goto error; |
1750 | } | |
1751 | ||
1752 | DBG("Mounted debugfs successfully at %s", path); | |
1753 | ||
1754 | error: | |
1755 | return ret; | |
1756 | } | |
1757 | ||
8c0faa1d | 1758 | /* |
d063d709 | 1759 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1760 | */ |
f3ed775e | 1761 | static void init_kernel_tracer(void) |
8c0faa1d | 1762 | { |
b73401da DG |
1763 | int ret; |
1764 | char *proc_mounts = "/proc/mounts"; | |
1765 | char line[256]; | |
684d34d2 | 1766 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1767 | FILE *fp; |
1768 | ||
1769 | /* Detect debugfs */ | |
1770 | fp = fopen(proc_mounts, "r"); | |
1771 | if (fp == NULL) { | |
1772 | ERR("Unable to probe %s", proc_mounts); | |
1773 | goto error; | |
1774 | } | |
1775 | ||
1776 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1777 | if (strstr(line, "debugfs") != NULL) { | |
1778 | /* Remove first string */ | |
1779 | strtok(line, " "); | |
1780 | /* Dup string here so we can reuse line later on */ | |
1781 | debugfs_path = strdup(strtok(NULL, " ")); | |
1782 | DBG("Got debugfs path : %s", debugfs_path); | |
1783 | break; | |
1784 | } | |
1785 | } | |
1786 | ||
1787 | fclose(fp); | |
1788 | ||
1789 | /* Mount debugfs if needded */ | |
1790 | if (debugfs_path == NULL) { | |
1791 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1792 | if (ret < 0) { | |
1793 | perror("asprintf debugfs path"); | |
1794 | goto error; | |
1795 | } | |
1796 | ret = mount_debugfs(debugfs_path); | |
1797 | if (ret < 0) { | |
7272acf5 | 1798 | perror("Cannot mount debugfs"); |
b73401da DG |
1799 | goto error; |
1800 | } | |
1801 | } | |
1802 | ||
1803 | /* Modprobe lttng kernel modules */ | |
1804 | ret = modprobe_kernel_modules(); | |
1805 | if (ret < 0) { | |
1806 | goto error; | |
1807 | } | |
1808 | ||
1809 | /* Setup lttng kernel path */ | |
1810 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1811 | if (ret < 0) { | |
1812 | perror("asprintf lttng path"); | |
1813 | goto error; | |
1814 | } | |
1815 | ||
1816 | /* Open debugfs lttng */ | |
1817 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1818 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1819 | DBG("Failed to open %s", lttng_path); |
1820 | goto error; | |
8c0faa1d DG |
1821 | } |
1822 | ||
b73401da DG |
1823 | free(lttng_path); |
1824 | free(debugfs_path); | |
f3ed775e | 1825 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1826 | return; |
1827 | ||
1828 | error: | |
1829 | if (lttng_path) { | |
1830 | free(lttng_path); | |
1831 | } | |
1832 | if (debugfs_path) { | |
1833 | free(debugfs_path); | |
1834 | } | |
1835 | WARN("No kernel tracer available"); | |
1836 | kernel_tracer_fd = 0; | |
1837 | return; | |
f3ed775e | 1838 | } |
33a2b854 | 1839 | |
f3ed775e | 1840 | /* |
54d01ffb | 1841 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1842 | */ |
54d01ffb | 1843 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1844 | { |
f40799e8 | 1845 | int ret = 0; |
8c0faa1d | 1846 | |
3bd1e081 | 1847 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1848 | /* |
54d01ffb DG |
1849 | * Assign default kernel consumer socket if no consumer assigned to the |
1850 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1851 | * an extra security check. | |
d9800920 DG |
1852 | */ |
1853 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1854 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1855 | } |
1856 | ||
2bdd86d4 | 1857 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1858 | if (ret < 0) { |
f3ed775e DG |
1859 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1860 | goto error; | |
1861 | } | |
1d4b027a | 1862 | |
3bd1e081 | 1863 | session->consumer_fds_sent = 1; |
f3ed775e | 1864 | } |
1d4b027a DG |
1865 | |
1866 | error: | |
1867 | return ret; | |
8c0faa1d DG |
1868 | } |
1869 | ||
0177d773 DG |
1870 | /* |
1871 | * Create an UST session and add it to the session ust list. | |
1872 | */ | |
44d3bd01 DG |
1873 | static int create_ust_session(struct ltt_session *session, |
1874 | struct lttng_domain *domain) | |
0177d773 | 1875 | { |
44d3bd01 | 1876 | int ret; |
48842b30 | 1877 | unsigned int uid; |
13384287 | 1878 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1879 | |
1880 | switch (domain->type) { | |
48842b30 | 1881 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1882 | break; |
1883 | default: | |
13384287 | 1884 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1885 | goto error; |
1886 | } | |
0177d773 DG |
1887 | |
1888 | DBG("Creating UST session"); | |
1889 | ||
44e96653 | 1890 | uid = session->uid; |
48842b30 | 1891 | lus = trace_ust_create_session(session->path, uid, domain); |
0177d773 | 1892 | if (lus == NULL) { |
44d3bd01 | 1893 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1894 | goto error; |
1895 | } | |
1896 | ||
48842b30 | 1897 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1898 | geteuid(), allowed_group()); |
1899 | if (ret < 0) { | |
1900 | if (ret != -EEXIST) { | |
1901 | ERR("Trace directory creation error"); | |
44d3bd01 | 1902 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1903 | goto error; |
1904 | } | |
1905 | } | |
1906 | ||
f6a9efaa DG |
1907 | /* The domain type dictate different actions on session creation */ |
1908 | switch (domain->type) { | |
48842b30 DG |
1909 | case LTTNG_DOMAIN_UST: |
1910 | /* No ustctl for the global UST domain */ | |
1911 | break; | |
1912 | default: | |
36dc12cc | 1913 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1914 | goto error; |
0177d773 | 1915 | } |
f6a9efaa | 1916 | session->ust_session = lus; |
44d3bd01 DG |
1917 | |
1918 | return LTTCOMM_OK; | |
0177d773 DG |
1919 | |
1920 | error: | |
1921 | free(lus); | |
1922 | return ret; | |
1923 | } | |
1924 | ||
333f285e | 1925 | /* |
d063d709 | 1926 | * Create a kernel tracer session then create the default channel. |
333f285e | 1927 | */ |
f3ed775e | 1928 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1929 | { |
f3ed775e | 1930 | int ret; |
f3ed775e DG |
1931 | |
1932 | DBG("Creating kernel session"); | |
1933 | ||
1934 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1935 | if (ret < 0) { | |
1936 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1937 | goto error; | |
333f285e DG |
1938 | } |
1939 | ||
d9800920 | 1940 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1941 | if (kconsumer_data.cmd_sock) { |
1942 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1943 | } |
1944 | ||
63053e7c DG |
1945 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1946 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1947 | if (ret < 0) { |
996b65c8 | 1948 | if (ret != -EEXIST) { |
7a485870 DG |
1949 | ERR("Trace directory creation error"); |
1950 | goto error; | |
1951 | } | |
1952 | } | |
1953 | ||
f3ed775e DG |
1954 | error: |
1955 | return ret; | |
333f285e DG |
1956 | } |
1957 | ||
6c9cc2ab DG |
1958 | /* |
1959 | * Using the session list, filled a lttng_session array to send back to the | |
1960 | * client for session listing. | |
1961 | * | |
1962 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1963 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1964 | */ |
1965 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1966 | { | |
1967 | int i = 0; | |
1968 | struct ltt_session *session; | |
1969 | ||
1970 | DBG("Getting all available session"); | |
1971 | /* | |
1972 | * Iterate over session list and append data after the control struct in | |
1973 | * the buffer. | |
1974 | */ | |
1975 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1976 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1977 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1978 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1979 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1980 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1981 | i++; |
1982 | } | |
1983 | } | |
1984 | ||
9f19cc17 DG |
1985 | /* |
1986 | * Fill lttng_channel array of all channels. | |
1987 | */ | |
b551a063 | 1988 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1989 | struct lttng_channel *channels) |
1990 | { | |
1991 | int i = 0; | |
1992 | struct ltt_kernel_channel *kchan; | |
1993 | ||
1994 | DBG("Listing channels for session %s", session->name); | |
1995 | ||
b551a063 DG |
1996 | switch (domain) { |
1997 | case LTTNG_DOMAIN_KERNEL: | |
1998 | /* Kernel channels */ | |
1999 | if (session->kernel_session != NULL) { | |
2000 | cds_list_for_each_entry(kchan, | |
2001 | &session->kernel_session->channel_list.head, list) { | |
2002 | /* Copy lttng_channel struct to array */ | |
2003 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2004 | channels[i].enabled = kchan->enabled; | |
2005 | i++; | |
2006 | } | |
2007 | } | |
2008 | break; | |
2009 | case LTTNG_DOMAIN_UST: | |
2010 | { | |
2011 | struct cds_lfht_iter iter; | |
2012 | struct ltt_ust_channel *uchan; | |
2013 | ||
2014 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
2015 | &iter, uchan, node) { | |
2016 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
2017 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2018 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2019 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2020 | channels[i].attr.switch_timer_interval = | |
2021 | uchan->attr.switch_timer_interval; | |
2022 | channels[i].attr.read_timer_interval = | |
2023 | uchan->attr.read_timer_interval; | |
aea829b3 | 2024 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2025 | switch (uchan->attr.output) { |
2026 | case LTTNG_UST_MMAP: | |
2027 | default: | |
2028 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2029 | break; | |
2030 | } | |
befe0905 | 2031 | i++; |
b551a063 DG |
2032 | } |
2033 | break; | |
2034 | } | |
2035 | default: | |
2036 | break; | |
2037 | } | |
2038 | } | |
2039 | ||
2040 | /* | |
2041 | * Create a list of ust global domain events. | |
2042 | */ | |
2043 | static int list_lttng_ust_global_events(char *channel_name, | |
2044 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2045 | { | |
2046 | int i = 0, ret = 0; | |
2047 | unsigned int nb_event = 0; | |
2048 | struct cds_lfht_iter iter; | |
d7b75b30 | 2049 | struct cds_lfht_node *node; |
b551a063 DG |
2050 | struct ltt_ust_channel *uchan; |
2051 | struct ltt_ust_event *uevent; | |
2052 | struct lttng_event *tmp; | |
2053 | ||
2054 | DBG("Listing UST global events for channel %s", channel_name); | |
2055 | ||
2056 | rcu_read_lock(); | |
2057 | ||
d7b75b30 DG |
2058 | node = hashtable_lookup(ust_global->channels, (void *) channel_name, |
2059 | strlen(channel_name), &iter); | |
2060 | if (node == NULL) { | |
2061 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2062 | goto error; | |
b551a063 DG |
2063 | } |
2064 | ||
d7b75b30 DG |
2065 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
2066 | ||
2067 | nb_event += hashtable_get_count(uchan->events); | |
2068 | ||
b551a063 DG |
2069 | if (nb_event == 0) { |
2070 | ret = nb_event; | |
2071 | goto error; | |
2072 | } | |
2073 | ||
2074 | DBG3("Listing UST global %d events", nb_event); | |
2075 | ||
2076 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2077 | if (tmp == NULL) { | |
2078 | ret = -LTTCOMM_FATAL; | |
2079 | goto error; | |
2080 | } | |
2081 | ||
d7b75b30 DG |
2082 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
2083 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
2084 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2085 | tmp[i].enabled = uevent->enabled; | |
2086 | switch (uevent->attr.instrumentation) { | |
2087 | case LTTNG_UST_TRACEPOINT: | |
2088 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2089 | break; | |
2090 | case LTTNG_UST_PROBE: | |
2091 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2092 | break; | |
2093 | case LTTNG_UST_FUNCTION: | |
2094 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2095 | break; | |
ac3bd9c0 | 2096 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2097 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2098 | break; |
9f19cc17 | 2099 | } |
d7b75b30 | 2100 | i++; |
9f19cc17 DG |
2101 | } |
2102 | ||
b551a063 DG |
2103 | ret = nb_event; |
2104 | *events = tmp; | |
2105 | ||
2106 | error: | |
2107 | rcu_read_unlock(); | |
2108 | return ret; | |
9f19cc17 DG |
2109 | } |
2110 | ||
2111 | /* | |
b551a063 | 2112 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2113 | */ |
b551a063 DG |
2114 | static int list_lttng_kernel_events(char *channel_name, |
2115 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2116 | { |
b551a063 DG |
2117 | int i = 0, ret; |
2118 | unsigned int nb_event; | |
9f19cc17 | 2119 | struct ltt_kernel_event *event; |
b551a063 DG |
2120 | struct ltt_kernel_channel *kchan; |
2121 | ||
2122 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2123 | if (kchan == NULL) { | |
2124 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2125 | goto error; | |
2126 | } | |
2127 | ||
2128 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2129 | |
2130 | DBG("Listing events for channel %s", kchan->channel->name); | |
2131 | ||
b551a063 DG |
2132 | if (nb_event == 0) { |
2133 | ret = nb_event; | |
2134 | goto error; | |
2135 | } | |
2136 | ||
2137 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2138 | if (*events == NULL) { | |
2139 | ret = LTTCOMM_FATAL; | |
2140 | goto error; | |
2141 | } | |
2142 | ||
9f19cc17 DG |
2143 | /* Kernel channels */ |
2144 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2145 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2146 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2147 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2148 | switch (event->event->instrumentation) { |
2149 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2150 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2151 | break; |
2152 | case LTTNG_KERNEL_KPROBE: | |
2153 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2154 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2155 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2156 | sizeof(struct lttng_kernel_kprobe)); |
2157 | break; | |
2158 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2159 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2160 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2161 | sizeof(struct lttng_kernel_function)); |
2162 | break; | |
0133c199 | 2163 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2164 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2165 | break; |
a54bd42d | 2166 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2167 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2168 | break; |
7a3d1328 MD |
2169 | case LTTNG_KERNEL_ALL: |
2170 | assert(0); | |
2171 | break; | |
9f19cc17 DG |
2172 | } |
2173 | i++; | |
2174 | } | |
b551a063 DG |
2175 | |
2176 | return nb_event; | |
2177 | ||
2178 | error: | |
2179 | return ret; | |
9f19cc17 DG |
2180 | } |
2181 | ||
fac6795d | 2182 | /* |
54d01ffb | 2183 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2184 | */ |
54d01ffb DG |
2185 | static int cmd_disable_channel(struct ltt_session *session, |
2186 | int domain, char *channel_name) | |
fac6795d | 2187 | { |
54d01ffb | 2188 | int ret; |
78f0bacd DG |
2189 | struct ltt_ust_session *usess; |
2190 | ||
2191 | usess = session->ust_session; | |
379473d2 | 2192 | |
54d01ffb | 2193 | switch (domain) { |
78f0bacd DG |
2194 | case LTTNG_DOMAIN_KERNEL: |
2195 | { | |
2196 | ret = channel_kernel_disable(session->kernel_session, | |
2197 | channel_name); | |
2198 | if (ret != LTTCOMM_OK) { | |
2199 | goto error; | |
2200 | } | |
54d01ffb | 2201 | |
78f0bacd DG |
2202 | kernel_wait_quiescent(kernel_tracer_fd); |
2203 | break; | |
2204 | } | |
2205 | case LTTNG_DOMAIN_UST: | |
2206 | { | |
2207 | struct ltt_ust_channel *uchan; | |
2208 | ||
2209 | /* Get channel in global UST domain HT */ | |
2210 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2211 | channel_name); | |
2212 | if (uchan == NULL) { | |
2213 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2214 | goto error; |
78f0bacd DG |
2215 | } |
2216 | ||
8535a6d9 DG |
2217 | /* Already disabled */ |
2218 | if (!uchan->enabled) { | |
2219 | DBG2("UST channel %s already disabled", channel_name); | |
2220 | break; | |
2221 | } | |
2222 | ||
35a9059d | 2223 | ret = ust_app_disable_channel_glb(usess, uchan); |
78f0bacd DG |
2224 | if (ret < 0) { |
2225 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
2226 | goto error; | |
2227 | } | |
2228 | ||
2229 | uchan->enabled = 0; | |
2230 | ||
2231 | break; | |
2232 | } | |
2233 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2234 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2235 | case LTTNG_DOMAIN_UST_PID: | |
2236 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2237 | goto error; | |
2238 | default: | |
2239 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2240 | goto error; | |
20fe2104 DG |
2241 | } |
2242 | ||
54d01ffb | 2243 | ret = LTTCOMM_OK; |
d65106b1 | 2244 | |
54d01ffb DG |
2245 | error: |
2246 | return ret; | |
2247 | } | |
2248 | ||
56fff090 DG |
2249 | /* |
2250 | * Copy channel from attributes and set it in the application channel list. | |
2251 | */ | |
f6a9efaa | 2252 | /* |
56fff090 DG |
2253 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2254 | struct lttng_channel *attr, struct ust_app *app) | |
2255 | { | |
2256 | int ret; | |
2257 | struct ltt_ust_channel *uchan, *new_chan; | |
2258 | ||
f6a9efaa | 2259 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2260 | if (uchan == NULL) { |
2261 | ret = LTTCOMM_FATAL; | |
2262 | goto error; | |
2263 | } | |
2264 | ||
2265 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2266 | if (new_chan == NULL) { | |
2267 | PERROR("malloc ltt_ust_channel"); | |
2268 | ret = LTTCOMM_FATAL; | |
2269 | goto error; | |
2270 | } | |
2271 | ||
2272 | ret = channel_ust_copy(new_chan, uchan); | |
2273 | if (ret < 0) { | |
2274 | ret = LTTCOMM_FATAL; | |
2275 | goto error; | |
2276 | } | |
2277 | ||
56fff090 DG |
2278 | error: |
2279 | return ret; | |
2280 | } | |
f6a9efaa | 2281 | */ |
56fff090 | 2282 | |
54d01ffb DG |
2283 | /* |
2284 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2285 | */ | |
44d3bd01 | 2286 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2287 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2288 | { |
2289 | int ret; | |
f6a9efaa DG |
2290 | struct ltt_ust_session *usess = session->ust_session; |
2291 | ||
5d56b5aa | 2292 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2293 | |
aea829b3 | 2294 | switch (domain) { |
44d3bd01 DG |
2295 | case LTTNG_DOMAIN_KERNEL: |
2296 | { | |
2297 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2298 | |
44d3bd01 DG |
2299 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2300 | session->kernel_session); | |
2301 | if (kchan == NULL) { | |
2302 | ret = channel_kernel_create(session->kernel_session, | |
2303 | attr, kernel_poll_pipe[1]); | |
2304 | } else { | |
2305 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2306 | } | |
2307 | ||
2308 | if (ret != LTTCOMM_OK) { | |
2309 | goto error; | |
2310 | } | |
2311 | ||
2312 | kernel_wait_quiescent(kernel_tracer_fd); | |
2313 | break; | |
2314 | } | |
f6a9efaa DG |
2315 | case LTTNG_DOMAIN_UST: |
2316 | { | |
2317 | struct ltt_ust_channel *uchan; | |
2318 | ||
48842b30 | 2319 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2320 | |
48842b30 | 2321 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2322 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2323 | attr->name); | |
2324 | if (uchan == NULL) { | |
48842b30 | 2325 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2326 | if (uchan == NULL) { |
2327 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2328 | goto error; | |
2329 | } | |
d5cd1f34 | 2330 | |
78f0bacd | 2331 | /* Add channel to all registered applications */ |
35a9059d | 2332 | ret = ust_app_create_channel_glb(usess, uchan); |
78f0bacd DG |
2333 | if (ret != 0) { |
2334 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2335 | goto error; | |
2336 | } | |
8535a6d9 DG |
2337 | |
2338 | rcu_read_lock(); | |
2339 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2340 | rcu_read_unlock(); | |
2341 | ||
2342 | DBG2("UST channel %s added to global domain HT", attr->name); | |
f6a9efaa | 2343 | } else { |
78f0bacd DG |
2344 | /* If already enabled, everything is OK */ |
2345 | if (uchan->enabled) { | |
8535a6d9 | 2346 | break; |
78f0bacd | 2347 | } |
f6a9efaa | 2348 | |
35a9059d | 2349 | ret = ust_app_enable_channel_glb(usess, uchan); |
78f0bacd | 2350 | if (ret < 0) { |
8535a6d9 DG |
2351 | if (ret != -EEXIST) { |
2352 | ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; | |
2353 | goto error; | |
2354 | } else { | |
2355 | ret = LTTCOMM_OK; | |
2356 | } | |
78f0bacd | 2357 | } |
48842b30 | 2358 | } |
f6a9efaa | 2359 | |
37357452 DG |
2360 | uchan->enabled = 1; |
2361 | ||
f6a9efaa DG |
2362 | break; |
2363 | } | |
78f0bacd DG |
2364 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2365 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2366 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2367 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2368 | goto error; | |
44d3bd01 DG |
2369 | default: |
2370 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2371 | goto error; | |
54d01ffb DG |
2372 | } |
2373 | ||
2374 | ret = LTTCOMM_OK; | |
2375 | ||
2376 | error: | |
2377 | return ret; | |
2378 | } | |
2379 | ||
2380 | /* | |
2381 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2382 | */ | |
2383 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2384 | char *channel_name, char *event_name) | |
2385 | { | |
2386 | int ret; | |
54d01ffb DG |
2387 | |
2388 | switch (domain) { | |
2389 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2390 | { |
2391 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2392 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2393 | |
b0a40d28 DG |
2394 | ksess = session->kernel_session; |
2395 | ||
2396 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2397 | if (kchan == NULL) { |
2398 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2399 | goto error; | |
d65106b1 DG |
2400 | } |
2401 | ||
b0a40d28 | 2402 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2403 | if (ret != LTTCOMM_OK) { |
2404 | goto error; | |
2405 | } | |
2406 | ||
2407 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2408 | break; |
2bdd86d4 MD |
2409 | } |
2410 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2411 | { |
b0a40d28 | 2412 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2413 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2414 | |
2415 | usess = session->ust_session; | |
2416 | ||
2417 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2418 | channel_name); | |
2419 | if (uchan == NULL) { | |
2420 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2421 | goto error; | |
2422 | } | |
2423 | ||
7f79d3a1 DG |
2424 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2425 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2426 | goto error; |
2427 | } | |
2428 | ||
7f79d3a1 | 2429 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2430 | channel_name); |
b0a40d28 DG |
2431 | break; |
2432 | } | |
2bdd86d4 MD |
2433 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2434 | case LTTNG_DOMAIN_UST_PID: | |
2435 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2436 | default: |
54d01ffb DG |
2437 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2438 | goto error; | |
d65106b1 | 2439 | } |
26cc6b4e | 2440 | |
54d01ffb DG |
2441 | ret = LTTCOMM_OK; |
2442 | ||
2443 | error: | |
2444 | return ret; | |
2445 | } | |
2446 | ||
2447 | /* | |
2448 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2449 | */ | |
2450 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2451 | char *channel_name) | |
2452 | { | |
2453 | int ret; | |
54d01ffb DG |
2454 | |
2455 | switch (domain) { | |
2456 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2457 | { |
2458 | struct ltt_kernel_session *ksess; | |
2459 | struct ltt_kernel_channel *kchan; | |
2460 | ||
2461 | ksess = session->kernel_session; | |
2462 | ||
2463 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2464 | if (kchan == NULL) { |
2465 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2466 | goto error; | |
26cc6b4e DG |
2467 | } |
2468 | ||
9730260e | 2469 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2470 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2471 | goto error; |
26cc6b4e DG |
2472 | } |
2473 | ||
54d01ffb | 2474 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2475 | break; |
9730260e DG |
2476 | } |
2477 | case LTTNG_DOMAIN_UST: | |
2478 | { | |
2479 | struct ltt_ust_session *usess; | |
2480 | struct ltt_ust_channel *uchan; | |
2481 | ||
2482 | usess = session->ust_session; | |
2483 | ||
2484 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2485 | channel_name); | |
2486 | if (uchan == NULL) { | |
2487 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2488 | goto error; | |
2489 | } | |
2490 | ||
7f79d3a1 DG |
2491 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2492 | if (ret != 0) { | |
9730260e DG |
2493 | goto error; |
2494 | } | |
2495 | ||
7f79d3a1 | 2496 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2497 | |
2498 | break; | |
2499 | } | |
2500 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2501 | case LTTNG_DOMAIN_UST_PID: | |
2502 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2503 | default: |
54d01ffb DG |
2504 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2505 | goto error; | |
26cc6b4e | 2506 | } |
e953ef25 | 2507 | |
54d01ffb | 2508 | ret = LTTCOMM_OK; |
e953ef25 | 2509 | |
54d01ffb DG |
2510 | error: |
2511 | return ret; | |
2512 | } | |
f5177a38 | 2513 | |
54d01ffb DG |
2514 | /* |
2515 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2516 | */ | |
2517 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2518 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2519 | { | |
2520 | int ret; | |
f5177a38 | 2521 | |
54d01ffb DG |
2522 | switch (domain) { |
2523 | case LTTNG_DOMAIN_KERNEL: | |
2524 | /* Add kernel context to kernel tracer */ | |
2525 | ret = context_kernel_add(session->kernel_session, ctx, | |
2526 | event_name, channel_name); | |
2527 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2528 | goto error; |
e953ef25 | 2529 | } |
2bdd86d4 MD |
2530 | break; |
2531 | case LTTNG_DOMAIN_UST: | |
2532 | { | |
55cc08a6 | 2533 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2534 | |
55cc08a6 DG |
2535 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2536 | if (ret != LTTCOMM_OK) { | |
2537 | goto error; | |
2bdd86d4 | 2538 | } |
e953ef25 | 2539 | break; |
2bdd86d4 | 2540 | } |
55cc08a6 DG |
2541 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2542 | case LTTNG_DOMAIN_UST_PID: | |
2543 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2544 | default: |
54d01ffb DG |
2545 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2546 | goto error; | |
e953ef25 | 2547 | } |
950131af | 2548 | |
54d01ffb | 2549 | ret = LTTCOMM_OK; |
950131af | 2550 | |
54d01ffb DG |
2551 | error: |
2552 | return ret; | |
2553 | } | |
2554 | ||
2555 | /* | |
2556 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2557 | * |
2558 | * TODO: currently, both events and loglevels are kept within the same | |
2559 | * namespace for UST global registry/app registery, so if an event | |
2560 | * happen to have the same name as the loglevel (very unlikely though), | |
2561 | * and an attempt is made to enable/disable both in the same session, | |
2562 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2563 | */ |
2564 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2565 | char *channel_name, struct lttng_event *event) | |
2566 | { | |
2567 | int ret; | |
f6cd6b0f | 2568 | struct lttng_channel *attr; |
48842b30 | 2569 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2570 | |
2571 | switch (domain) { | |
2572 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2573 | { |
2574 | struct ltt_kernel_channel *kchan; | |
2575 | ||
54d01ffb DG |
2576 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2577 | session->kernel_session); | |
2578 | if (kchan == NULL) { | |
f6cd6b0f DG |
2579 | attr = channel_new_default_attr(domain); |
2580 | if (attr == NULL) { | |
2581 | ret = LTTCOMM_FATAL; | |
2582 | goto error; | |
2583 | } | |
2584 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2585 | ||
54d01ffb | 2586 | /* This call will notify the kernel thread */ |
44d3bd01 | 2587 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2588 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2589 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2590 | free(attr); |
f5177a38 DG |
2591 | goto error; |
2592 | } | |
ff4d74e6 | 2593 | free(attr); |
54d01ffb | 2594 | } |
950131af | 2595 | |
54d01ffb DG |
2596 | /* Get the newly created kernel channel pointer */ |
2597 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2598 | session->kernel_session); | |
2599 | if (kchan == NULL) { | |
2600 | /* This sould not happen... */ | |
2601 | ret = LTTCOMM_FATAL; | |
2602 | goto error; | |
2603 | } | |
f5177a38 | 2604 | |
48842b30 DG |
2605 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2606 | event); | |
54d01ffb | 2607 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2608 | goto error; |
950131af DG |
2609 | } |
2610 | ||
54d01ffb | 2611 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2612 | break; |
2bdd86d4 MD |
2613 | } |
2614 | case LTTNG_DOMAIN_UST: | |
2615 | { | |
aea829b3 | 2616 | struct lttng_channel *attr; |
edb67388 | 2617 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2618 | |
edb67388 | 2619 | /* Get channel from global UST domain */ |
48842b30 DG |
2620 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2621 | channel_name); | |
2622 | if (uchan == NULL) { | |
aea829b3 DG |
2623 | /* Create default channel */ |
2624 | attr = channel_new_default_attr(domain); | |
2625 | if (attr == NULL) { | |
2626 | ret = LTTCOMM_FATAL; | |
2627 | goto error; | |
2628 | } | |
596219f7 | 2629 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2630 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 DG |
2631 | |
2632 | /* Use the internal command enable channel */ | |
2633 | ret = cmd_enable_channel(session, domain, attr); | |
edb67388 | 2634 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2635 | free(attr); |
aea829b3 DG |
2636 | goto error; |
2637 | } | |
aea829b3 DG |
2638 | free(attr); |
2639 | ||
2640 | /* Get the newly created channel reference back */ | |
2641 | uchan = trace_ust_find_channel_by_name( | |
2642 | usess->domain_global.channels, channel_name); | |
2643 | if (uchan == NULL) { | |
2644 | /* Something is really wrong */ | |
2645 | ret = LTTCOMM_FATAL; | |
2646 | goto error; | |
2647 | } | |
48842b30 | 2648 | } |
2bdd86d4 | 2649 | |
edb67388 | 2650 | /* At this point, the session and channel exist on the tracer */ |
d5cd1f34 | 2651 | |
edb67388 DG |
2652 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2653 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2654 | goto error; |
2bdd86d4 MD |
2655 | } |
2656 | break; | |
2657 | } | |
2658 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2659 | case LTTNG_DOMAIN_UST_PID: | |
2660 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2661 | default: |
54d01ffb DG |
2662 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2663 | goto error; | |
950131af | 2664 | } |
d36b8583 | 2665 | |
54d01ffb | 2666 | ret = LTTCOMM_OK; |
d36b8583 | 2667 | |
54d01ffb DG |
2668 | error: |
2669 | return ret; | |
2670 | } | |
7d29a247 | 2671 | |
54d01ffb DG |
2672 | /* |
2673 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2674 | */ | |
2675 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2676 | char *channel_name, int event_type) |
54d01ffb DG |
2677 | { |
2678 | int ret; | |
2679 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2680 | |
54d01ffb DG |
2681 | switch (domain) { |
2682 | case LTTNG_DOMAIN_KERNEL: | |
2683 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2684 | session->kernel_session); | |
2685 | if (kchan == NULL) { | |
2686 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2687 | ret = channel_kernel_create(session->kernel_session, NULL, |
2688 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2689 | if (ret != LTTCOMM_OK) { |
2690 | goto error; | |
d36b8583 | 2691 | } |
0d0c377a | 2692 | |
8f69e5eb DG |
2693 | /* Get the newly created kernel channel pointer */ |
2694 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2695 | session->kernel_session); | |
2696 | if (kchan == NULL) { | |
2697 | /* This sould not happen... */ | |
2698 | ret = LTTCOMM_FATAL; | |
2699 | goto error; | |
2700 | } | |
2701 | ||
54d01ffb | 2702 | } |
0fdd1e2c | 2703 | |
7a3d1328 | 2704 | switch (event_type) { |
76d45b40 | 2705 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2706 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2707 | kchan, kernel_tracer_fd); |
7a3d1328 | 2708 | break; |
76d45b40 | 2709 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2710 | /* |
7a3d1328 MD |
2711 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2712 | * events already registered to the channel. | |
8c9ae521 | 2713 | */ |
7a3d1328 MD |
2714 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2715 | kchan, kernel_tracer_fd); | |
2716 | break; | |
76d45b40 | 2717 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2718 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2719 | ret = event_kernel_enable_all(session->kernel_session, |
2720 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2721 | break; |
2722 | default: | |
2723 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2724 | goto error; | |
8c9ae521 | 2725 | } |
8f69e5eb DG |
2726 | |
2727 | /* Manage return value */ | |
54d01ffb | 2728 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2729 | goto error; |
d36b8583 DG |
2730 | } |
2731 | ||
54d01ffb | 2732 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2733 | break; |
76d45b40 DG |
2734 | case LTTNG_DOMAIN_UST: |
2735 | { | |
2736 | struct lttng_channel *attr; | |
2737 | struct ltt_ust_channel *uchan; | |
2738 | struct ltt_ust_session *usess = session->ust_session; | |
2739 | ||
2740 | /* Get channel from global UST domain */ | |
2741 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2742 | channel_name); | |
2743 | if (uchan == NULL) { | |
2744 | /* Create default channel */ | |
2745 | attr = channel_new_default_attr(domain); | |
2746 | if (attr == NULL) { | |
2747 | ret = LTTCOMM_FATAL; | |
2748 | goto error; | |
2749 | } | |
2750 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2751 | attr->name[NAME_MAX - 1] = '\0'; | |
2752 | ||
2753 | /* Use the internal command enable channel */ | |
2754 | ret = cmd_enable_channel(session, domain, attr); | |
2755 | if (ret != LTTCOMM_OK) { | |
2756 | free(attr); | |
2757 | goto error; | |
2758 | } | |
2759 | free(attr); | |
2760 | ||
2761 | /* Get the newly created channel reference back */ | |
2762 | uchan = trace_ust_find_channel_by_name( | |
2763 | usess->domain_global.channels, channel_name); | |
2764 | if (uchan == NULL) { | |
2765 | /* Something is really wrong */ | |
2766 | ret = LTTCOMM_FATAL; | |
2767 | goto error; | |
2768 | } | |
2769 | } | |
2770 | ||
2771 | /* At this point, the session and channel exist on the tracer */ | |
2772 | ||
2773 | switch (event_type) { | |
2774 | case LTTNG_EVENT_ALL: | |
2775 | case LTTNG_EVENT_TRACEPOINT: | |
2776 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2777 | if (ret != LTTCOMM_OK) { | |
2778 | goto error; | |
2779 | } | |
2780 | break; | |
2781 | default: | |
2782 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2783 | goto error; | |
2784 | } | |
2785 | ||
2786 | /* Manage return value */ | |
2787 | if (ret != LTTCOMM_OK) { | |
2788 | goto error; | |
2789 | } | |
2790 | ||
2791 | break; | |
2792 | } | |
2793 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2794 | case LTTNG_DOMAIN_UST_PID: | |
2795 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2796 | default: |
54d01ffb DG |
2797 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2798 | goto error; | |
d36b8583 | 2799 | } |
f3ed775e | 2800 | |
54d01ffb DG |
2801 | ret = LTTCOMM_OK; |
2802 | ||
2803 | error: | |
2804 | return ret; | |
2805 | } | |
2806 | ||
2807 | /* | |
2808 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2809 | */ | |
2810 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2811 | { | |
2812 | int ret; | |
2813 | ssize_t nb_events = 0; | |
2814 | ||
2815 | switch (domain) { | |
2816 | case LTTNG_DOMAIN_KERNEL: | |
2817 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2818 | if (nb_events < 0) { | |
2819 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2820 | goto error; | |
894be886 | 2821 | } |
54d01ffb | 2822 | break; |
b551a063 DG |
2823 | case LTTNG_DOMAIN_UST: |
2824 | nb_events = ust_app_list_events(events); | |
2825 | if (nb_events < 0) { | |
2826 | ret = LTTCOMM_UST_LIST_FAIL; | |
2827 | goto error; | |
2828 | } | |
2829 | break; | |
54d01ffb | 2830 | default: |
54d01ffb DG |
2831 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2832 | goto error; | |
2833 | } | |
894be886 | 2834 | |
54d01ffb | 2835 | return nb_events; |
7d29a247 | 2836 | |
54d01ffb DG |
2837 | error: |
2838 | /* Return negative value to differentiate return code */ | |
2839 | return -ret; | |
2840 | } | |
b389abbe | 2841 | |
54d01ffb DG |
2842 | /* |
2843 | * Command LTTNG_START_TRACE processed by the client thread. | |
2844 | */ | |
2845 | static int cmd_start_trace(struct ltt_session *session) | |
2846 | { | |
2847 | int ret; | |
54d01ffb | 2848 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2849 | struct ltt_ust_session *usess; |
b389abbe | 2850 | |
54d01ffb DG |
2851 | /* Short cut */ |
2852 | ksession = session->kernel_session; | |
b9d9b220 | 2853 | usess = session->ust_session; |
5eb91c98 | 2854 | |
464dd62d MD |
2855 | if (session->enabled) |
2856 | return LTTCOMM_UST_START_FAIL; | |
2857 | session->enabled = 1; | |
2858 | ||
54d01ffb DG |
2859 | /* Kernel tracing */ |
2860 | if (ksession != NULL) { | |
2bdd86d4 MD |
2861 | struct ltt_kernel_channel *kchan; |
2862 | ||
54d01ffb DG |
2863 | /* Open kernel metadata */ |
2864 | if (ksession->metadata == NULL) { | |
2865 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2866 | if (ret < 0) { | |
2867 | ret = LTTCOMM_KERN_META_FAIL; | |
2868 | goto error; | |
b389abbe | 2869 | } |
54d01ffb | 2870 | } |
7d29a247 | 2871 | |
54d01ffb DG |
2872 | /* Open kernel metadata stream */ |
2873 | if (ksession->metadata_stream_fd == 0) { | |
2874 | ret = kernel_open_metadata_stream(ksession); | |
2875 | if (ret < 0) { | |
2876 | ERR("Kernel create metadata stream failed"); | |
2877 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2878 | goto error; | |
2879 | } | |
2880 | } | |
2881 | ||
2882 | /* For each channel */ | |
2883 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2884 | if (kchan->stream_count == 0) { | |
2885 | ret = kernel_open_channel_stream(kchan); | |
2886 | if (ret < 0) { | |
2887 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2888 | goto error; |
2889 | } | |
54d01ffb DG |
2890 | /* Update the stream global counter */ |
2891 | ksession->stream_count_global += ret; | |
7d29a247 | 2892 | } |
54d01ffb DG |
2893 | } |
2894 | ||
2895 | /* Setup kernel consumer socket and send fds to it */ | |
2896 | ret = init_kernel_tracing(ksession); | |
2897 | if (ret < 0) { | |
2898 | ret = LTTCOMM_KERN_START_FAIL; | |
2899 | goto error; | |
2900 | } | |
2901 | ||
2902 | /* This start the kernel tracing */ | |
2903 | ret = kernel_start_session(ksession); | |
2904 | if (ret < 0) { | |
2905 | ret = LTTCOMM_KERN_START_FAIL; | |
2906 | goto error; | |
2907 | } | |
2908 | ||
2909 | /* Quiescent wait after starting trace */ | |
2910 | kernel_wait_quiescent(kernel_tracer_fd); | |
2911 | } | |
2912 | ||
36dc12cc | 2913 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2914 | if (usess) { |
2915 | usess->start_trace = 1; | |
36dc12cc | 2916 | |
b9d9b220 DG |
2917 | ret = ust_app_start_trace_all(usess); |
2918 | if (ret < 0) { | |
2919 | ret = LTTCOMM_UST_START_FAIL; | |
2920 | goto error; | |
2921 | } | |
2bdd86d4 | 2922 | } |
54d01ffb DG |
2923 | |
2924 | ret = LTTCOMM_OK; | |
2925 | ||
2926 | error: | |
2927 | return ret; | |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2932 | */ | |
2933 | static int cmd_stop_trace(struct ltt_session *session) | |
2934 | { | |
2935 | int ret; | |
2936 | struct ltt_kernel_channel *kchan; | |
2937 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2938 | struct ltt_ust_session *usess; |
54d01ffb DG |
2939 | |
2940 | /* Short cut */ | |
2941 | ksession = session->kernel_session; | |
8be98f9a | 2942 | usess = session->ust_session; |
54d01ffb | 2943 | |
464dd62d MD |
2944 | if (!session->enabled) |
2945 | return LTTCOMM_UST_START_FAIL; | |
2946 | session->enabled = 0; | |
2947 | ||
54d01ffb DG |
2948 | /* Kernel tracer */ |
2949 | if (ksession != NULL) { | |
2950 | DBG("Stop kernel tracing"); | |
2951 | ||
2952 | /* Flush all buffers before stopping */ | |
2953 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2954 | if (ret < 0) { | |
2955 | ERR("Kernel metadata flush failed"); | |
2956 | } | |
f34daff7 | 2957 | |
54d01ffb DG |
2958 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2959 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2960 | if (ret < 0) { |
54d01ffb | 2961 | ERR("Kernel flush buffer error"); |
7d29a247 | 2962 | } |
54d01ffb | 2963 | } |
19e70852 | 2964 | |
54d01ffb DG |
2965 | ret = kernel_stop_session(ksession); |
2966 | if (ret < 0) { | |
2967 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2968 | goto error; |
f3ed775e | 2969 | } |
54d01ffb DG |
2970 | |
2971 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2972 | } |
54d01ffb | 2973 | |
8be98f9a MD |
2974 | if (usess) { |
2975 | usess->start_trace = 0; | |
2bdd86d4 | 2976 | |
8be98f9a | 2977 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2978 | if (ret < 0) { |
8be98f9a | 2979 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2980 | goto error; |
2981 | } | |
2bdd86d4 | 2982 | } |
54d01ffb DG |
2983 | |
2984 | ret = LTTCOMM_OK; | |
2985 | ||
2986 | error: | |
2987 | return ret; | |
2988 | } | |
2989 | ||
2990 | /* | |
2991 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2992 | */ | |
2993 | static int cmd_create_session(char *name, char *path) | |
2994 | { | |
2995 | int ret; | |
2996 | ||
2997 | ret = session_create(name, path); | |
2998 | if (ret != LTTCOMM_OK) { | |
2999 | goto error; | |
3000 | } | |
3001 | ||
3002 | ret = LTTCOMM_OK; | |
3003 | ||
3004 | error: | |
3005 | return ret; | |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
3010 | */ | |
3011 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
3012 | { | |
3013 | int ret; | |
3014 | ||
3015 | /* Clean kernel session teardown */ | |
3016 | teardown_kernel_session(session); | |
84cd17c6 MD |
3017 | /* UST session teardown */ |
3018 | teardown_ust_session(session); | |
54d01ffb DG |
3019 | |
3020 | /* | |
3021 | * Must notify the kernel thread here to update it's poll setin order | |
3022 | * to remove the channel(s)' fd just destroyed. | |
3023 | */ | |
3024 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
3025 | if (ret < 0) { | |
3026 | perror("write kernel poll pipe"); | |
3027 | } | |
3028 | ||
271933a4 | 3029 | ret = session_destroy(session); |
54d01ffb DG |
3030 | |
3031 | return ret; | |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * Command LTTNG_CALIBRATE processed by the client thread. | |
3036 | */ | |
3037 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
3038 | { | |
3039 | int ret; | |
3040 | ||
3041 | switch (domain) { | |
3042 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 3043 | { |
54d01ffb | 3044 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 3045 | |
54d01ffb DG |
3046 | kcalibrate.type = calibrate->type; |
3047 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 3048 | if (ret < 0) { |
54d01ffb DG |
3049 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
3050 | goto error; | |
33a2b854 | 3051 | } |
54d01ffb DG |
3052 | break; |
3053 | } | |
3054 | default: | |
3055 | /* TODO: Userspace tracing */ | |
3056 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3057 | goto error; | |
3058 | } | |
33a2b854 | 3059 | |
54d01ffb | 3060 | ret = LTTCOMM_OK; |
33a2b854 | 3061 | |
54d01ffb DG |
3062 | error: |
3063 | return ret; | |
3064 | } | |
7d29a247 | 3065 | |
54d01ffb DG |
3066 | /* |
3067 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3068 | */ | |
3069 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3070 | char *sock_path) | |
3071 | { | |
3072 | int ret, sock; | |
b389abbe | 3073 | |
54d01ffb DG |
3074 | switch (domain) { |
3075 | case LTTNG_DOMAIN_KERNEL: | |
3076 | /* Can't register a consumer if there is already one */ | |
3077 | if (session->kernel_session->consumer_fd != 0) { | |
3078 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
3079 | goto error; | |
3080 | } | |
3081 | ||
3082 | sock = lttcomm_connect_unix_sock(sock_path); | |
3083 | if (sock < 0) { | |
3084 | ret = LTTCOMM_CONNECT_FAIL; | |
3085 | goto error; | |
3086 | } | |
3087 | ||
3088 | session->kernel_session->consumer_fd = sock; | |
3089 | break; | |
3090 | default: | |
3091 | /* TODO: Userspace tracing */ | |
3092 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3093 | goto error; | |
3094 | } | |
3095 | ||
3096 | ret = LTTCOMM_OK; | |
3097 | ||
3098 | error: | |
3099 | return ret; | |
3100 | } | |
3101 | ||
3102 | /* | |
3103 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3104 | */ | |
3105 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3106 | struct lttng_domain **domains) | |
3107 | { | |
b551a063 | 3108 | int ret, index = 0; |
54d01ffb DG |
3109 | ssize_t nb_dom = 0; |
3110 | ||
3111 | if (session->kernel_session != NULL) { | |
b551a063 | 3112 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3113 | nb_dom++; |
3114 | } | |
3115 | ||
b551a063 DG |
3116 | if (session->ust_session != NULL) { |
3117 | DBG3("Listing domains found UST global domain"); | |
3118 | nb_dom++; | |
3119 | } | |
54d01ffb | 3120 | |
b551a063 | 3121 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3122 | if (*domains == NULL) { |
3123 | ret = -LTTCOMM_FATAL; | |
3124 | goto error; | |
3125 | } | |
3126 | ||
b551a063 DG |
3127 | if (session->kernel_session != NULL) { |
3128 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3129 | index++; | |
3130 | } | |
3131 | ||
3132 | if (session->ust_session != NULL) { | |
3133 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3134 | index++; | |
3135 | } | |
54d01ffb | 3136 | |
54d01ffb DG |
3137 | return nb_dom; |
3138 | ||
3139 | error: | |
3140 | return ret; | |
3141 | } | |
3142 | ||
3143 | /* | |
3144 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3145 | */ | |
b551a063 | 3146 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3147 | struct lttng_channel **channels) |
3148 | { | |
3149 | int ret; | |
3150 | ssize_t nb_chan = 0; | |
3151 | ||
b551a063 DG |
3152 | switch (domain) { |
3153 | case LTTNG_DOMAIN_KERNEL: | |
3154 | if (session->kernel_session != NULL) { | |
3155 | nb_chan = session->kernel_session->channel_count; | |
3156 | } | |
0df502fd | 3157 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3158 | break; |
3159 | case LTTNG_DOMAIN_UST: | |
3160 | if (session->ust_session != NULL) { | |
3161 | nb_chan = hashtable_get_count( | |
3162 | session->ust_session->domain_global.channels); | |
3163 | } | |
0df502fd | 3164 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3165 | break; |
3166 | default: | |
3167 | *channels = NULL; | |
3168 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3169 | goto error; |
3170 | } | |
3171 | ||
b551a063 DG |
3172 | if (nb_chan > 0) { |
3173 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3174 | if (*channels == NULL) { | |
3175 | ret = -LTTCOMM_FATAL; | |
3176 | goto error; | |
3177 | } | |
54d01ffb | 3178 | |
b551a063 DG |
3179 | list_lttng_channels(domain, session, *channels); |
3180 | } else { | |
3181 | *channels = NULL; | |
3182 | } | |
2bdd86d4 | 3183 | |
54d01ffb DG |
3184 | return nb_chan; |
3185 | ||
3186 | error: | |
3187 | return ret; | |
3188 | } | |
3189 | ||
3190 | /* | |
3191 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3192 | */ | |
b551a063 | 3193 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3194 | char *channel_name, struct lttng_event **events) |
3195 | { | |
b551a063 | 3196 | int ret = 0; |
54d01ffb | 3197 | ssize_t nb_event = 0; |
54d01ffb | 3198 | |
b551a063 DG |
3199 | switch (domain) { |
3200 | case LTTNG_DOMAIN_KERNEL: | |
3201 | if (session->kernel_session != NULL) { | |
3202 | nb_event = list_lttng_kernel_events(channel_name, | |
3203 | session->kernel_session, events); | |
54d01ffb | 3204 | } |
b551a063 DG |
3205 | break; |
3206 | case LTTNG_DOMAIN_UST: | |
3207 | { | |
3208 | if (session->ust_session != NULL) { | |
3209 | nb_event = list_lttng_ust_global_events(channel_name, | |
3210 | &session->ust_session->domain_global, events); | |
3211 | } | |
3212 | break; | |
54d01ffb | 3213 | } |
b551a063 DG |
3214 | default: |
3215 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3216 | goto error; |
3217 | } | |
3218 | ||
b551a063 | 3219 | ret = nb_event; |
54d01ffb DG |
3220 | |
3221 | error: | |
3222 | return ret; | |
3223 | } | |
3224 | ||
3225 | /* | |
3226 | * Process the command requested by the lttng client within the command | |
3227 | * context structure. This function make sure that the return structure (llm) | |
3228 | * is set and ready for transmission before returning. | |
3229 | * | |
3230 | * Return any error encountered or 0 for success. | |
3231 | */ | |
3232 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3233 | { | |
3234 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3235 | int need_tracing_session = 1; |
54d01ffb DG |
3236 | |
3237 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3238 | ||
3239 | /* | |
3240 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3241 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3242 | * command. |
3243 | */ | |
3244 | switch(cmd_ctx->lsm->cmd_type) { | |
3245 | case LTTNG_LIST_SESSIONS: | |
3246 | case LTTNG_LIST_TRACEPOINTS: | |
3247 | case LTTNG_LIST_DOMAINS: | |
3248 | case LTTNG_LIST_CHANNELS: | |
3249 | case LTTNG_LIST_EVENTS: | |
3250 | break; | |
3251 | default: | |
3252 | /* Setup lttng message with no payload */ | |
3253 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3254 | if (ret < 0) { | |
3255 | /* This label does not try to unlock the session */ | |
3256 | goto init_setup_error; | |
3257 | } | |
3258 | } | |
3259 | ||
3260 | /* Commands that DO NOT need a session. */ | |
3261 | switch (cmd_ctx->lsm->cmd_type) { | |
3262 | case LTTNG_CALIBRATE: | |
3263 | case LTTNG_CREATE_SESSION: | |
3264 | case LTTNG_LIST_SESSIONS: | |
3265 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3266 | need_tracing_session = 0; |
54d01ffb DG |
3267 | break; |
3268 | default: | |
3269 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3270 | session_lock_list(); |
54d01ffb | 3271 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3272 | session_unlock_list(); |
54d01ffb DG |
3273 | if (cmd_ctx->session == NULL) { |
3274 | if (cmd_ctx->lsm->session.name != NULL) { | |
3275 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3276 | } else { | |
3277 | /* If no session name specified */ | |
3278 | ret = LTTCOMM_SELECT_SESS; | |
3279 | } | |
3280 | goto error; | |
3281 | } else { | |
3282 | /* Acquire lock for the session */ | |
3283 | session_lock(cmd_ctx->session); | |
3284 | } | |
3285 | break; | |
3286 | } | |
b389abbe | 3287 | |
54d01ffb DG |
3288 | /* |
3289 | * Check domain type for specific "pre-action". | |
3290 | */ | |
3291 | switch (cmd_ctx->lsm->domain.type) { | |
3292 | case LTTNG_DOMAIN_KERNEL: | |
3293 | /* Kernel tracer check */ | |
3294 | if (kernel_tracer_fd == 0) { | |
3295 | /* Basically, load kernel tracer modules */ | |
3296 | init_kernel_tracer(); | |
3297 | if (kernel_tracer_fd == 0) { | |
3298 | ret = LTTCOMM_KERN_NA; | |
3299 | goto error; | |
3300 | } | |
3301 | } | |
5eb91c98 | 3302 | |
54d01ffb | 3303 | /* Need a session for kernel command */ |
44d3bd01 | 3304 | if (need_tracing_session) { |
54d01ffb DG |
3305 | if (cmd_ctx->session->kernel_session == NULL) { |
3306 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 3307 | if (ret < 0) { |
54d01ffb | 3308 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3309 | goto error; |
3310 | } | |
b389abbe | 3311 | } |
7d29a247 | 3312 | |
54d01ffb | 3313 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3314 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3315 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3316 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3317 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3318 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3319 | if (ret < 0) { |
54d01ffb DG |
3320 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3321 | goto error; | |
950131af | 3322 | } |
3ff2ecac MD |
3323 | } else { |
3324 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3325 | } |
0d0c377a | 3326 | } |
54d01ffb | 3327 | break; |
2bdd86d4 | 3328 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3329 | { |
44d3bd01 | 3330 | if (need_tracing_session) { |
f6a9efaa | 3331 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3332 | ret = create_ust_session(cmd_ctx->session, |
3333 | &cmd_ctx->lsm->domain); | |
3334 | if (ret != LTTCOMM_OK) { | |
3335 | goto error; | |
3336 | } | |
3337 | } | |
7753dea8 MD |
3338 | /* Start the UST consumer daemons */ |
3339 | /* 64-bit */ | |
3340 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3341 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3342 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3343 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3344 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3345 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3346 | if (ret < 0) { |
7753dea8 MD |
3347 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3348 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3349 | goto error; |
3350 | } | |
48842b30 | 3351 | |
7753dea8 | 3352 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3353 | } else { |
7753dea8 MD |
3354 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3355 | } | |
3356 | /* 32-bit */ | |
fc7a59ce | 3357 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3358 | ustconsumer32_data.pid == 0 && |
3359 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3360 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3361 | ret = start_consumerd(&ustconsumer32_data); | |
3362 | if (ret < 0) { | |
3363 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3364 | ust_consumerd32_fd = -EINVAL; | |
3365 | goto error; | |
3366 | } | |
3367 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3368 | } else { | |
3369 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3370 | } |
44d3bd01 DG |
3371 | } |
3372 | break; | |
48842b30 | 3373 | } |
54d01ffb | 3374 | default: |
54d01ffb DG |
3375 | break; |
3376 | } | |
33a2b854 | 3377 | |
54d01ffb DG |
3378 | /* Process by command type */ |
3379 | switch (cmd_ctx->lsm->cmd_type) { | |
3380 | case LTTNG_ADD_CONTEXT: | |
3381 | { | |
3382 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3383 | cmd_ctx->lsm->u.context.channel_name, | |
3384 | cmd_ctx->lsm->u.context.event_name, | |
3385 | &cmd_ctx->lsm->u.context.ctx); | |
3386 | break; | |
3387 | } | |
3388 | case LTTNG_DISABLE_CHANNEL: | |
3389 | { | |
3390 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3391 | cmd_ctx->lsm->u.disable.channel_name); | |
3392 | break; | |
3393 | } | |
3394 | case LTTNG_DISABLE_EVENT: | |
3395 | { | |
3396 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3397 | cmd_ctx->lsm->u.disable.channel_name, | |
3398 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3399 | ret = LTTCOMM_OK; |
3400 | break; | |
3401 | } | |
54d01ffb DG |
3402 | case LTTNG_DISABLE_ALL_EVENT: |
3403 | { | |
2bdd86d4 | 3404 | DBG("Disabling all events"); |
54d01ffb DG |
3405 | |
3406 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3407 | cmd_ctx->lsm->u.disable.channel_name); | |
3408 | break; | |
3409 | } | |
3410 | case LTTNG_ENABLE_CHANNEL: | |
3411 | { | |
aea829b3 | 3412 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3413 | &cmd_ctx->lsm->u.channel.chan); |
3414 | break; | |
3415 | } | |
3416 | case LTTNG_ENABLE_EVENT: | |
3417 | { | |
3418 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3419 | cmd_ctx->lsm->u.enable.channel_name, | |
3420 | &cmd_ctx->lsm->u.enable.event); | |
3421 | break; | |
3422 | } | |
3423 | case LTTNG_ENABLE_ALL_EVENT: | |
3424 | { | |
2bdd86d4 | 3425 | DBG("Enabling all events"); |
54d01ffb DG |
3426 | |
3427 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3428 | cmd_ctx->lsm->u.enable.channel_name, |
3429 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3430 | break; |
3431 | } | |
052da939 | 3432 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3433 | { |
9f19cc17 | 3434 | struct lttng_event *events; |
54d01ffb | 3435 | ssize_t nb_events; |
052da939 | 3436 | |
54d01ffb DG |
3437 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3438 | if (nb_events < 0) { | |
3439 | ret = -nb_events; | |
3440 | goto error; | |
2ef84c95 DG |
3441 | } |
3442 | ||
3443 | /* | |
3444 | * Setup lttng message with payload size set to the event list size in | |
3445 | * bytes and then copy list into the llm payload. | |
3446 | */ | |
052da939 | 3447 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3448 | if (ret < 0) { |
052da939 | 3449 | free(events); |
2ef84c95 DG |
3450 | goto setup_error; |
3451 | } | |
3452 | ||
3453 | /* Copy event list into message payload */ | |
9f19cc17 | 3454 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3455 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3456 | |
9f19cc17 | 3457 | free(events); |
2ef84c95 DG |
3458 | |
3459 | ret = LTTCOMM_OK; | |
3460 | break; | |
3461 | } | |
f3ed775e | 3462 | case LTTNG_START_TRACE: |
8c0faa1d | 3463 | { |
54d01ffb | 3464 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3465 | break; |
3466 | } | |
f3ed775e | 3467 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3468 | { |
54d01ffb | 3469 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3470 | break; |
3471 | } | |
5e16da05 MD |
3472 | case LTTNG_CREATE_SESSION: |
3473 | { | |
54d01ffb DG |
3474 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3475 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3476 | break; |
3477 | } | |
3478 | case LTTNG_DESTROY_SESSION: | |
3479 | { | |
54d01ffb DG |
3480 | ret = cmd_destroy_session(cmd_ctx->session, |
3481 | cmd_ctx->lsm->session.name); | |
5461b305 | 3482 | break; |
5e16da05 | 3483 | } |
9f19cc17 | 3484 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3485 | { |
54d01ffb DG |
3486 | ssize_t nb_dom; |
3487 | struct lttng_domain *domains; | |
5461b305 | 3488 | |
54d01ffb DG |
3489 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3490 | if (nb_dom < 0) { | |
3491 | ret = -nb_dom; | |
3492 | goto error; | |
ce3d728c | 3493 | } |
520ff687 | 3494 | |
54d01ffb | 3495 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3496 | if (ret < 0) { |
3497 | goto setup_error; | |
520ff687 | 3498 | } |
57167058 | 3499 | |
54d01ffb DG |
3500 | /* Copy event list into message payload */ |
3501 | memcpy(cmd_ctx->llm->payload, domains, | |
3502 | nb_dom * sizeof(struct lttng_domain)); | |
3503 | ||
3504 | free(domains); | |
5e16da05 | 3505 | |
5461b305 | 3506 | ret = LTTCOMM_OK; |
5e16da05 MD |
3507 | break; |
3508 | } | |
9f19cc17 | 3509 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3510 | { |
54d01ffb DG |
3511 | size_t nb_chan; |
3512 | struct lttng_channel *channels; | |
3513 | ||
b551a063 DG |
3514 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3515 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3516 | if (nb_chan < 0) { |
3517 | ret = -nb_chan; | |
3518 | goto error; | |
5461b305 | 3519 | } |
ca95a216 | 3520 | |
54d01ffb | 3521 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3522 | if (ret < 0) { |
3523 | goto setup_error; | |
3524 | } | |
9f19cc17 | 3525 | |
54d01ffb DG |
3526 | /* Copy event list into message payload */ |
3527 | memcpy(cmd_ctx->llm->payload, channels, | |
3528 | nb_chan * sizeof(struct lttng_channel)); | |
3529 | ||
3530 | free(channels); | |
9f19cc17 DG |
3531 | |
3532 | ret = LTTCOMM_OK; | |
5461b305 | 3533 | break; |
5e16da05 | 3534 | } |
9f19cc17 | 3535 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3536 | { |
b551a063 | 3537 | ssize_t nb_event; |
684d34d2 | 3538 | struct lttng_event *events = NULL; |
9f19cc17 | 3539 | |
b551a063 | 3540 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3541 | cmd_ctx->lsm->u.list.channel_name, &events); |
3542 | if (nb_event < 0) { | |
3543 | ret = -nb_event; | |
3544 | goto error; | |
5461b305 | 3545 | } |
ca95a216 | 3546 | |
54d01ffb | 3547 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3548 | if (ret < 0) { |
3549 | goto setup_error; | |
3550 | } | |
9f19cc17 | 3551 | |
54d01ffb DG |
3552 | /* Copy event list into message payload */ |
3553 | memcpy(cmd_ctx->llm->payload, events, | |
3554 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3555 | |
54d01ffb | 3556 | free(events); |
9f19cc17 DG |
3557 | |
3558 | ret = LTTCOMM_OK; | |
5461b305 | 3559 | break; |
5e16da05 MD |
3560 | } |
3561 | case LTTNG_LIST_SESSIONS: | |
3562 | { | |
54d01ffb | 3563 | session_lock_list(); |
5461b305 | 3564 | |
6c9cc2ab | 3565 | if (session_list_ptr->count == 0) { |
f3ed775e | 3566 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3567 | session_unlock_list(); |
5461b305 | 3568 | goto error; |
57167058 | 3569 | } |
5e16da05 | 3570 | |
6c9cc2ab DG |
3571 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3572 | session_list_ptr->count); | |
5461b305 | 3573 | if (ret < 0) { |
54d01ffb | 3574 | session_unlock_list(); |
5461b305 | 3575 | goto setup_error; |
e065084a | 3576 | } |
5e16da05 | 3577 | |
6c9cc2ab DG |
3578 | /* Filled the session array */ |
3579 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3580 | ||
54d01ffb | 3581 | session_unlock_list(); |
5e16da05 | 3582 | |
5461b305 | 3583 | ret = LTTCOMM_OK; |
5e16da05 MD |
3584 | break; |
3585 | } | |
d0254c7c MD |
3586 | case LTTNG_CALIBRATE: |
3587 | { | |
54d01ffb DG |
3588 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3589 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3590 | break; |
3591 | } | |
d9800920 DG |
3592 | case LTTNG_REGISTER_CONSUMER: |
3593 | { | |
54d01ffb DG |
3594 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3595 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3596 | break; |
3597 | } | |
5e16da05 | 3598 | default: |
5e16da05 | 3599 | ret = LTTCOMM_UND; |
5461b305 | 3600 | break; |
fac6795d DG |
3601 | } |
3602 | ||
5461b305 | 3603 | error: |
5461b305 DG |
3604 | if (cmd_ctx->llm == NULL) { |
3605 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3606 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3607 | goto setup_error; |
3608 | } | |
3609 | } | |
54d01ffb | 3610 | /* Set return code */ |
5461b305 | 3611 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3612 | setup_error: |
b5541356 | 3613 | if (cmd_ctx->session) { |
54d01ffb | 3614 | session_unlock(cmd_ctx->session); |
b5541356 | 3615 | } |
54d01ffb | 3616 | init_setup_error: |
8028d920 | 3617 | return ret; |
fac6795d DG |
3618 | } |
3619 | ||
1d4b027a | 3620 | /* |
d063d709 DG |
3621 | * This thread manage all clients request using the unix client socket for |
3622 | * communication. | |
1d4b027a DG |
3623 | */ |
3624 | static void *thread_manage_clients(void *data) | |
3625 | { | |
5eb91c98 DG |
3626 | int sock = 0, ret, i, pollfd; |
3627 | uint32_t revents, nb_fd; | |
273ea72c | 3628 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3629 | struct lttng_poll_event events; |
1d4b027a DG |
3630 | |
3631 | DBG("[thread] Manage client started"); | |
3632 | ||
f6a9efaa DG |
3633 | rcu_register_thread(); |
3634 | ||
1d4b027a DG |
3635 | ret = lttcomm_listen_unix_sock(client_sock); |
3636 | if (ret < 0) { | |
3637 | goto error; | |
3638 | } | |
3639 | ||
5eb91c98 DG |
3640 | /* |
3641 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3642 | * more will be added to this poll set. | |
3643 | */ | |
3644 | ret = create_thread_poll_set(&events, 2); | |
3645 | if (ret < 0) { | |
3646 | goto error; | |
3647 | } | |
273ea72c | 3648 | |
5eb91c98 DG |
3649 | /* Add the application registration socket */ |
3650 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3651 | if (ret < 0) { | |
3652 | goto error; | |
3653 | } | |
273ea72c | 3654 | |
bbd973c2 DG |
3655 | /* |
3656 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3657 | */ |
3658 | if (opt_sig_parent) { | |
3659 | kill(ppid, SIGCHLD); | |
3660 | } | |
3661 | ||
3662 | while (1) { | |
1d4b027a | 3663 | DBG("Accepting client command ..."); |
273ea72c | 3664 | |
5eb91c98 DG |
3665 | nb_fd = LTTNG_POLL_GETNB(&events); |
3666 | ||
273ea72c | 3667 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3668 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3669 | if (ret < 0) { |
273ea72c DG |
3670 | goto error; |
3671 | } | |
3672 | ||
5eb91c98 DG |
3673 | for (i = 0; i < nb_fd; i++) { |
3674 | /* Fetch once the poll data */ | |
3675 | revents = LTTNG_POLL_GETEV(&events, i); | |
3676 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3677 | ||
3678 | /* Thread quit pipe has been closed. Killing thread. */ | |
3679 | ret = check_thread_quit_pipe(pollfd, revents); | |
3680 | if (ret) { | |
3681 | goto error; | |
3682 | } | |
3683 | ||
3684 | /* Event on the registration socket */ | |
3685 | if (pollfd == client_sock) { | |
3686 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3687 | ERR("Client socket poll error"); | |
3688 | goto error; | |
3689 | } | |
3690 | } | |
3691 | } | |
3692 | ||
3693 | DBG("Wait for client response"); | |
3694 | ||
3695 | sock = lttcomm_accept_unix_sock(client_sock); | |
3696 | if (sock < 0) { | |
273ea72c | 3697 | goto error; |
273ea72c DG |
3698 | } |
3699 | ||
5eb91c98 | 3700 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3701 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3702 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3703 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3704 | goto error; |
5eb91c98 | 3705 | } |
1d4b027a | 3706 | |
5eb91c98 | 3707 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3708 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3709 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3710 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3711 | goto error; |
3712 | } | |
1d4b027a | 3713 | |
5eb91c98 DG |
3714 | cmd_ctx->llm = NULL; |
3715 | cmd_ctx->session = NULL; | |
1d4b027a | 3716 | |
5eb91c98 DG |
3717 | /* |
3718 | * Data is received from the lttng client. The struct | |
3719 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3720 | * the client. | |
3721 | */ | |
3722 | DBG("Receiving data from client ..."); | |
3723 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3724 | sizeof(struct lttcomm_session_msg)); | |
3725 | if (ret <= 0) { | |
3726 | DBG("Nothing recv() from client... continuing"); | |
3727 | close(sock); | |
3728 | free(cmd_ctx); | |
3729 | continue; | |
3730 | } | |
1d4b027a | 3731 | |
5eb91c98 DG |
3732 | // TODO: Validate cmd_ctx including sanity check for |
3733 | // security purpose. | |
f7776ea7 | 3734 | |
f6a9efaa | 3735 | rcu_thread_online(); |
5eb91c98 DG |
3736 | /* |
3737 | * This function dispatch the work to the kernel or userspace tracer | |
3738 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3739 | * informations for the client. The command context struct contains | |
3740 | * everything this function may needs. | |
3741 | */ | |
3742 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3743 | rcu_thread_offline(); |
5eb91c98 | 3744 | if (ret < 0) { |
bbd973c2 | 3745 | /* |
5eb91c98 | 3746 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3747 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3748 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3749 | */ |
bbd973c2 | 3750 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3751 | continue; |
3752 | } | |
d6e4fca4 | 3753 | |
54d01ffb DG |
3754 | DBG("Sending response (size: %d, retcode: %s)", |
3755 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3756 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3757 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3758 | if (ret < 0) { |
3759 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3760 | } |
1d4b027a | 3761 | |
5eb91c98 DG |
3762 | clean_command_ctx(&cmd_ctx); |
3763 | ||
3764 | /* End of transmission */ | |
273ea72c DG |
3765 | close(sock); |
3766 | } | |
3767 | ||
5eb91c98 DG |
3768 | error: |
3769 | DBG("Client thread dying"); | |
273ea72c | 3770 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3771 | close(client_sock); |
3772 | close(sock); | |
273ea72c | 3773 | |
5eb91c98 | 3774 | lttng_poll_clean(&events); |
a2fb29a5 | 3775 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3776 | |
3777 | rcu_unregister_thread(); | |
1d4b027a DG |
3778 | return NULL; |
3779 | } | |
3780 | ||
3781 | ||
fac6795d DG |
3782 | /* |
3783 | * usage function on stderr | |
3784 | */ | |
3785 | static void usage(void) | |
3786 | { | |
b716ce68 | 3787 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3788 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3789 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3790 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3791 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3792 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3793 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3794 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3795 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3796 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3797 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3798 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3799 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3800 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3801 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3802 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3803 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3804 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3805 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3806 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3807 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3808 | } |
3809 | ||
3810 | /* | |
3811 | * daemon argument parsing | |
3812 | */ | |
3813 | static int parse_args(int argc, char **argv) | |
3814 | { | |
3815 | int c; | |
3816 | ||
3817 | static struct option long_options[] = { | |
3818 | { "client-sock", 1, 0, 'c' }, | |
3819 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3820 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3821 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3822 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3823 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3824 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3825 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3826 | { "consumerd32-path", 1, 0, 'u' }, | |
3827 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3828 | { "consumerd64-path", 1, 0, 't' }, | |
3829 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3830 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3831 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3832 | { "help", 0, 0, 'h' }, |
3833 | { "group", 1, 0, 'g' }, | |
3834 | { "version", 0, 0, 'V' }, | |
75462a81 | 3835 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3836 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3837 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3838 | { NULL, 0, 0, 0 } |
3839 | }; | |
3840 | ||
3841 | while (1) { | |
3842 | int option_index = 0; | |
7753dea8 | 3843 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3844 | long_options, &option_index); |
fac6795d DG |
3845 | if (c == -1) { |
3846 | break; | |
3847 | } | |
3848 | ||
3849 | switch (c) { | |
3850 | case 0: | |
3851 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3852 | if (optarg) { | |
3853 | fprintf(stderr, " with arg %s\n", optarg); | |
3854 | } | |
3855 | break; | |
b716ce68 | 3856 | case 'c': |
fac6795d DG |
3857 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3858 | break; | |
3859 | case 'a': | |
3860 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3861 | break; | |
3862 | case 'd': | |
3863 | opt_daemon = 1; | |
3864 | break; | |
3865 | case 'g': | |
fb09408a | 3866 | opt_tracing_group = optarg; |
fac6795d DG |
3867 | break; |
3868 | case 'h': | |
3869 | usage(); | |
3870 | exit(EXIT_FAILURE); | |
3871 | case 'V': | |
3872 | fprintf(stdout, "%s\n", VERSION); | |
3873 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3874 | case 'S': |
3875 | opt_sig_parent = 1; | |
3876 | break; | |
d6f42150 | 3877 | case 'E': |
3bd1e081 | 3878 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3879 | break; |
3880 | case 'C': | |
3bd1e081 MD |
3881 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3882 | break; | |
3883 | case 'F': | |
7753dea8 | 3884 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3885 | break; |
3886 | case 'D': | |
7753dea8 MD |
3887 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3888 | break; | |
3889 | case 'H': | |
3890 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3891 | break; | |
3892 | case 'G': | |
3893 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3894 | break; |
75462a81 DG |
3895 | case 'q': |
3896 | opt_quiet = 1; | |
3897 | break; | |
3f9947db | 3898 | case 'v': |
53086306 DG |
3899 | /* Verbose level can increase using multiple -v */ |
3900 | opt_verbose += 1; | |
3f9947db | 3901 | break; |
31f73cc9 | 3902 | case 'Z': |
3bd1e081 | 3903 | opt_verbose_consumer += 1; |
31f73cc9 | 3904 | break; |
fb09408a | 3905 | case 'u': |
fc7a59ce | 3906 | consumerd32_bin= optarg; |
ebaeda94 MD |
3907 | break; |
3908 | case 'U': | |
3909 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3910 | break; |
3911 | case 't': | |
fc7a59ce | 3912 | consumerd64_bin = optarg; |
ebaeda94 MD |
3913 | break; |
3914 | case 'T': | |
3915 | consumerd64_libdir = optarg; | |
fb09408a | 3916 | break; |
fac6795d DG |
3917 | default: |
3918 | /* Unknown option or other error. | |
3919 | * Error is printed by getopt, just return */ | |
3920 | return -1; | |
3921 | } | |
3922 | } | |
3923 | ||
3924 | return 0; | |
3925 | } | |
3926 | ||
3927 | /* | |
d063d709 | 3928 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3929 | * apps_sock - The communication socket for all UST apps. |
3930 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3931 | */ |
cf3af59e | 3932 | static int init_daemon_socket(void) |
fac6795d DG |
3933 | { |
3934 | int ret = 0; | |
3935 | mode_t old_umask; | |
3936 | ||
3937 | old_umask = umask(0); | |
3938 | ||
3939 | /* Create client tool unix socket */ | |
d6f42150 DG |
3940 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3941 | if (client_sock < 0) { | |
3942 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3943 | ret = -1; |
3944 | goto end; | |
3945 | } | |
3946 | ||
3947 | /* File permission MUST be 660 */ | |
3948 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3949 | if (ret < 0) { | |
d6f42150 | 3950 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3951 | perror("chmod"); |
3952 | goto end; | |
3953 | } | |
3954 | ||
3955 | /* Create the application unix socket */ | |
d6f42150 DG |
3956 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3957 | if (apps_sock < 0) { | |
3958 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3959 | ret = -1; |
3960 | goto end; | |
3961 | } | |
3962 | ||
d6f42150 | 3963 | /* File permission MUST be 666 */ |
54d01ffb DG |
3964 | ret = chmod(apps_unix_sock_path, |
3965 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3966 | if (ret < 0) { |
d6f42150 | 3967 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3968 | perror("chmod"); |
3969 | goto end; | |
3970 | } | |
3971 | ||
3972 | end: | |
3973 | umask(old_umask); | |
3974 | return ret; | |
3975 | } | |
3976 | ||
3977 | /* | |
54d01ffb DG |
3978 | * Check if the global socket is available, and if a daemon is answering at the |
3979 | * other side. If yes, error is returned. | |
fac6795d | 3980 | */ |
cf3af59e | 3981 | static int check_existing_daemon(void) |
fac6795d | 3982 | { |
7d8234d9 | 3983 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3984 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3985 | return 0; |
099e26bd | 3986 | } |
54d01ffb | 3987 | |
7d8234d9 | 3988 | /* Is there anybody out there ? */ |
099e26bd | 3989 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3990 | return -EEXIST; |
099e26bd | 3991 | } else { |
7d8234d9 | 3992 | return 0; |
099e26bd | 3993 | } |
fac6795d DG |
3994 | } |
3995 | ||
fac6795d | 3996 | /* |
d063d709 | 3997 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3998 | * |
d063d709 DG |
3999 | * Race window between mkdir and chown is OK because we are going from more |
4000 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 4001 | */ |
d6f42150 | 4002 | static int set_permissions(void) |
fac6795d DG |
4003 | { |
4004 | int ret; | |
996b65c8 | 4005 | gid_t gid; |
fac6795d | 4006 | |
996b65c8 MD |
4007 | gid = allowed_group(); |
4008 | if (gid < 0) { | |
a463f419 DG |
4009 | if (is_root) { |
4010 | WARN("No tracing group detected"); | |
4011 | ret = 0; | |
4012 | } else { | |
4013 | ERR("Missing tracing group. Aborting execution."); | |
4014 | ret = -1; | |
4015 | } | |
fac6795d DG |
4016 | goto end; |
4017 | } | |
4018 | ||
d6f42150 | 4019 | /* Set lttng run dir */ |
996b65c8 | 4020 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
4021 | if (ret < 0) { |
4022 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
4023 | perror("chown"); | |
4024 | } | |
4025 | ||
4026 | /* lttng client socket path */ | |
996b65c8 | 4027 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4028 | if (ret < 0) { |
d6f42150 DG |
4029 | ERR("Unable to set group on %s", client_unix_sock_path); |
4030 | perror("chown"); | |
4031 | } | |
4032 | ||
3bd1e081 MD |
4033 | /* kconsumer error socket path */ |
4034 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4035 | if (ret < 0) { |
3bd1e081 MD |
4036 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
4037 | perror("chown"); | |
4038 | } | |
4039 | ||
7753dea8 MD |
4040 | /* 64-bit ustconsumer error socket path */ |
4041 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4042 | if (ret < 0) { | |
4043 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4044 | perror("chown"); | |
4045 | } | |
4046 | ||
4047 | /* 32-bit ustconsumer compat32 error socket path */ | |
4048 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4049 | if (ret < 0) { |
7753dea8 | 4050 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4051 | perror("chown"); |
4052 | } | |
4053 | ||
d6f42150 | 4054 | DBG("All permissions are set"); |
e07ae692 | 4055 | |
fac6795d DG |
4056 | end: |
4057 | return ret; | |
4058 | } | |
4059 | ||
7a485870 | 4060 | /* |
d063d709 | 4061 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4062 | */ |
4063 | static int create_kernel_poll_pipe(void) | |
4064 | { | |
4065 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4066 | } | |
4067 | ||
099e26bd DG |
4068 | /* |
4069 | * Create the application command pipe to wake thread_manage_apps. | |
4070 | */ | |
4071 | static int create_apps_cmd_pipe(void) | |
4072 | { | |
4073 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4074 | } | |
4075 | ||
d6f42150 | 4076 | /* |
d063d709 | 4077 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
4078 | */ |
4079 | static int create_lttng_rundir(void) | |
4080 | { | |
4081 | int ret; | |
4082 | ||
4083 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
4084 | if (ret < 0) { | |
b1f11e69 DG |
4085 | if (errno != EEXIST) { |
4086 | ERR("Unable to create " LTTNG_RUNDIR); | |
4087 | goto error; | |
4088 | } else { | |
4089 | ret = 0; | |
4090 | } | |
d6f42150 DG |
4091 | } |
4092 | ||
4093 | error: | |
4094 | return ret; | |
4095 | } | |
4096 | ||
4097 | /* | |
d063d709 DG |
4098 | * Setup sockets and directory needed by the kconsumerd communication with the |
4099 | * session daemon. | |
d6f42150 | 4100 | */ |
3bd1e081 | 4101 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
4102 | { |
4103 | int ret; | |
7753dea8 | 4104 | const char *path; |
d6f42150 | 4105 | |
7753dea8 MD |
4106 | switch (consumer_data->type) { |
4107 | case LTTNG_CONSUMER_KERNEL: | |
4108 | path = KCONSUMERD_PATH; | |
4109 | break; | |
4110 | case LTTNG_CONSUMER64_UST: | |
4111 | path = USTCONSUMERD64_PATH; | |
4112 | break; | |
4113 | case LTTNG_CONSUMER32_UST: | |
4114 | path = USTCONSUMERD32_PATH; | |
4115 | break; | |
4116 | default: | |
4117 | ERR("Consumer type unknown"); | |
4118 | ret = -EINVAL; | |
4119 | goto error; | |
d6f42150 DG |
4120 | } |
4121 | ||
3bd1e081 | 4122 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4123 | if (ret < 0) { |
6beb2242 | 4124 | if (errno != EEXIST) { |
3bd1e081 | 4125 | ERR("Failed to create %s", path); |
6beb2242 DG |
4126 | goto error; |
4127 | } | |
4128 | ret = 0; | |
d6f42150 DG |
4129 | } |
4130 | ||
4131 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4132 | consumer_data->err_sock = |
4133 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4134 | if (consumer_data->err_sock < 0) { | |
4135 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4136 | ret = -1; |
4137 | goto error; | |
4138 | } | |
4139 | ||
4140 | /* File permission MUST be 660 */ | |
3bd1e081 | 4141 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4142 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4143 | if (ret < 0) { |
3bd1e081 | 4144 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
4145 | perror("chmod"); |
4146 | goto error; | |
4147 | } | |
4148 | ||
4149 | error: | |
4150 | return ret; | |
4151 | } | |
4152 | ||
fac6795d | 4153 | /* |
d063d709 | 4154 | * Signal handler for the daemon |
cf3af59e | 4155 | * |
54d01ffb DG |
4156 | * Simply stop all worker threads, leaving main() return gracefully after |
4157 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4158 | */ |
4159 | static void sighandler(int sig) | |
4160 | { | |
4161 | switch (sig) { | |
cf3af59e MD |
4162 | case SIGPIPE: |
4163 | DBG("SIGPIPE catched"); | |
4164 | return; | |
4165 | case SIGINT: | |
4166 | DBG("SIGINT catched"); | |
4167 | stop_threads(); | |
4168 | break; | |
4169 | case SIGTERM: | |
4170 | DBG("SIGTERM catched"); | |
4171 | stop_threads(); | |
4172 | break; | |
4173 | default: | |
4174 | break; | |
fac6795d | 4175 | } |
fac6795d DG |
4176 | } |
4177 | ||
4178 | /* | |
d063d709 | 4179 | * Setup signal handler for : |
1d4b027a | 4180 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4181 | */ |
1d4b027a | 4182 | static int set_signal_handler(void) |
fac6795d | 4183 | { |
1d4b027a DG |
4184 | int ret = 0; |
4185 | struct sigaction sa; | |
4186 | sigset_t sigset; | |
fac6795d | 4187 | |
1d4b027a DG |
4188 | if ((ret = sigemptyset(&sigset)) < 0) { |
4189 | perror("sigemptyset"); | |
4190 | return ret; | |
4191 | } | |
d6f42150 | 4192 | |
1d4b027a DG |
4193 | sa.sa_handler = sighandler; |
4194 | sa.sa_mask = sigset; | |
4195 | sa.sa_flags = 0; | |
4196 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4197 | perror("sigaction"); | |
4198 | return ret; | |
d6f42150 DG |
4199 | } |
4200 | ||
1d4b027a DG |
4201 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4202 | perror("sigaction"); | |
4203 | return ret; | |
d6f42150 | 4204 | } |
aaf26714 | 4205 | |
1d4b027a DG |
4206 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4207 | perror("sigaction"); | |
4208 | return ret; | |
8c0faa1d DG |
4209 | } |
4210 | ||
1d4b027a DG |
4211 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4212 | ||
4213 | return ret; | |
fac6795d DG |
4214 | } |
4215 | ||
f3ed775e | 4216 | /* |
d063d709 DG |
4217 | * Set open files limit to unlimited. This daemon can open a large number of |
4218 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4219 | */ |
4220 | static void set_ulimit(void) | |
4221 | { | |
4222 | int ret; | |
4223 | struct rlimit lim; | |
4224 | ||
a88df331 | 4225 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4226 | lim.rlim_cur = 65535; |
4227 | lim.rlim_max = 65535; | |
4228 | ||
4229 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4230 | if (ret < 0) { | |
4231 | perror("failed to set open files limit"); | |
4232 | } | |
4233 | } | |
4234 | ||
fac6795d DG |
4235 | /* |
4236 | * main | |
4237 | */ | |
4238 | int main(int argc, char **argv) | |
4239 | { | |
fac6795d DG |
4240 | int ret = 0; |
4241 | void *status; | |
b082db07 | 4242 | const char *home_path; |
fac6795d | 4243 | |
f6a9efaa DG |
4244 | rcu_register_thread(); |
4245 | ||
273ea72c | 4246 | /* Create thread quit pipe */ |
cf3af59e MD |
4247 | if ((ret = init_thread_quit_pipe()) < 0) { |
4248 | goto error; | |
273ea72c DG |
4249 | } |
4250 | ||
7753dea8 | 4251 | setup_consumerd_path(); |
fb09408a | 4252 | |
fac6795d DG |
4253 | /* Parse arguments */ |
4254 | progname = argv[0]; | |
4255 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4256 | goto error; |
fac6795d DG |
4257 | } |
4258 | ||
4259 | /* Daemonize */ | |
4260 | if (opt_daemon) { | |
53094c05 DG |
4261 | ret = daemon(0, 0); |
4262 | if (ret < 0) { | |
4263 | perror("daemon"); | |
cf3af59e | 4264 | goto error; |
53094c05 | 4265 | } |
fac6795d DG |
4266 | } |
4267 | ||
4268 | /* Check if daemon is UID = 0 */ | |
4269 | is_root = !getuid(); | |
4270 | ||
fac6795d | 4271 | if (is_root) { |
d6f42150 DG |
4272 | ret = create_lttng_rundir(); |
4273 | if (ret < 0) { | |
cf3af59e | 4274 | goto error; |
d6f42150 DG |
4275 | } |
4276 | ||
fac6795d | 4277 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4278 | snprintf(apps_unix_sock_path, PATH_MAX, |
4279 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4280 | } |
4281 | ||
4282 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4283 | snprintf(client_unix_sock_path, PATH_MAX, |
4284 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4285 | } | |
0fdd1e2c DG |
4286 | |
4287 | /* Set global SHM for ust */ | |
4288 | if (strlen(wait_shm_path) == 0) { | |
4289 | snprintf(wait_shm_path, PATH_MAX, | |
4290 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4291 | } | |
fac6795d | 4292 | } else { |
b082db07 DG |
4293 | home_path = get_home_dir(); |
4294 | if (home_path == NULL) { | |
273ea72c DG |
4295 | /* TODO: Add --socket PATH option */ |
4296 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4297 | ret = -EPERM; |
4298 | goto error; | |
b082db07 DG |
4299 | } |
4300 | ||
fac6795d | 4301 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4302 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4303 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4304 | } |
4305 | ||
4306 | /* Set the cli tool unix socket path */ | |
4307 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4308 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4309 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4310 | } |
0fdd1e2c DG |
4311 | |
4312 | /* Set global SHM for ust */ | |
4313 | if (strlen(wait_shm_path) == 0) { | |
4314 | snprintf(wait_shm_path, PATH_MAX, | |
4315 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4316 | } | |
fac6795d DG |
4317 | } |
4318 | ||
847177cd DG |
4319 | DBG("Client socket path %s", client_unix_sock_path); |
4320 | DBG("Application socket path %s", apps_unix_sock_path); | |
4321 | ||
273ea72c | 4322 | /* |
7d8234d9 | 4323 | * See if daemon already exist. |
fac6795d | 4324 | */ |
7d8234d9 | 4325 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4326 | ERR("Already running daemon.\n"); |
273ea72c | 4327 | /* |
cf3af59e MD |
4328 | * We do not goto exit because we must not cleanup() |
4329 | * because a daemon is already running. | |
ab118b20 | 4330 | */ |
cf3af59e | 4331 | goto error; |
a88df331 DG |
4332 | } |
4333 | ||
54d01ffb | 4334 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4335 | |
4336 | /* | |
4337 | * These actions must be executed as root. We do that *after* setting up | |
4338 | * the sockets path because we MUST make the check for another daemon using | |
4339 | * those paths *before* trying to set the kernel consumer sockets and init | |
4340 | * kernel tracer. | |
4341 | */ | |
4342 | if (is_root) { | |
3bd1e081 MD |
4343 | ret = set_consumer_sockets(&kconsumer_data); |
4344 | if (ret < 0) { | |
4345 | goto exit; | |
4346 | } | |
48842b30 | 4347 | |
7753dea8 | 4348 | ret = set_consumer_sockets(&ustconsumer64_data); |
a88df331 | 4349 | if (ret < 0) { |
cf3af59e | 4350 | goto exit; |
a88df331 | 4351 | } |
7753dea8 MD |
4352 | |
4353 | ret = set_consumer_sockets(&ustconsumer32_data); | |
4354 | if (ret < 0) { | |
4355 | goto exit; | |
4356 | } | |
4357 | ||
a88df331 DG |
4358 | /* Setup kernel tracer */ |
4359 | init_kernel_tracer(); | |
4360 | ||
4361 | /* Set ulimit for open files */ | |
4362 | set_ulimit(); | |
fac6795d DG |
4363 | } |
4364 | ||
cf3af59e MD |
4365 | if ((ret = set_signal_handler()) < 0) { |
4366 | goto exit; | |
fac6795d DG |
4367 | } |
4368 | ||
d6f42150 | 4369 | /* Setup the needed unix socket */ |
cf3af59e MD |
4370 | if ((ret = init_daemon_socket()) < 0) { |
4371 | goto exit; | |
fac6795d DG |
4372 | } |
4373 | ||
4374 | /* Set credentials to socket */ | |
cf3af59e MD |
4375 | if (is_root && ((ret = set_permissions()) < 0)) { |
4376 | goto exit; | |
fac6795d DG |
4377 | } |
4378 | ||
5b8719f5 DG |
4379 | /* Get parent pid if -S, --sig-parent is specified. */ |
4380 | if (opt_sig_parent) { | |
4381 | ppid = getppid(); | |
4382 | } | |
4383 | ||
7a485870 | 4384 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4385 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4386 | goto exit; | |
7a485870 DG |
4387 | } |
4388 | ||
099e26bd DG |
4389 | /* Setup the thread apps communication pipe. */ |
4390 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4391 | goto exit; | |
4392 | } | |
4393 | ||
4394 | /* Init UST command queue. */ | |
4395 | cds_wfq_init(&ust_cmd_queue.queue); | |
4396 | ||
f6a9efaa DG |
4397 | /* Init UST app hash table */ |
4398 | ust_app_ht_alloc(); | |
4399 | ||
273ea72c | 4400 | /* |
54d01ffb DG |
4401 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4402 | * statically declared in session.c | |
273ea72c | 4403 | */ |
54d01ffb | 4404 | session_list_ptr = session_get_list(); |
b5541356 | 4405 | |
5eb91c98 DG |
4406 | /* Set up max poll set size */ |
4407 | lttng_poll_set_max_size(); | |
4408 | ||
cf3af59e | 4409 | /* Create thread to manage the client socket */ |
099e26bd DG |
4410 | ret = pthread_create(&client_thread, NULL, |
4411 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4412 | if (ret != 0) { |
099e26bd | 4413 | perror("pthread_create clients"); |
cf3af59e MD |
4414 | goto exit_client; |
4415 | } | |
fac6795d | 4416 | |
099e26bd DG |
4417 | /* Create thread to dispatch registration */ |
4418 | ret = pthread_create(&dispatch_thread, NULL, | |
4419 | thread_dispatch_ust_registration, (void *) NULL); | |
4420 | if (ret != 0) { | |
4421 | perror("pthread_create dispatch"); | |
4422 | goto exit_dispatch; | |
4423 | } | |
4424 | ||
4425 | /* Create thread to manage application registration. */ | |
4426 | ret = pthread_create(®_apps_thread, NULL, | |
4427 | thread_registration_apps, (void *) NULL); | |
4428 | if (ret != 0) { | |
4429 | perror("pthread_create registration"); | |
4430 | goto exit_reg_apps; | |
4431 | } | |
4432 | ||
cf3af59e | 4433 | /* Create thread to manage application socket */ |
54d01ffb DG |
4434 | ret = pthread_create(&apps_thread, NULL, |
4435 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4436 | if (ret != 0) { |
099e26bd | 4437 | perror("pthread_create apps"); |
cf3af59e MD |
4438 | goto exit_apps; |
4439 | } | |
fac6795d | 4440 | |
cf3af59e | 4441 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4442 | ret = pthread_create(&kernel_thread, NULL, |
4443 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4444 | if (ret != 0) { |
099e26bd | 4445 | perror("pthread_create kernel"); |
cf3af59e MD |
4446 | goto exit_kernel; |
4447 | } | |
7a485870 | 4448 | |
cf3af59e MD |
4449 | ret = pthread_join(kernel_thread, &status); |
4450 | if (ret != 0) { | |
4451 | perror("pthread_join"); | |
4452 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4453 | } |
4454 | ||
cf3af59e MD |
4455 | exit_kernel: |
4456 | ret = pthread_join(apps_thread, &status); | |
4457 | if (ret != 0) { | |
4458 | perror("pthread_join"); | |
4459 | goto error; /* join error, exit without cleanup */ | |
4460 | } | |
fac6795d | 4461 | |
cf3af59e | 4462 | exit_apps: |
099e26bd DG |
4463 | ret = pthread_join(reg_apps_thread, &status); |
4464 | if (ret != 0) { | |
4465 | perror("pthread_join"); | |
4466 | goto error; /* join error, exit without cleanup */ | |
4467 | } | |
4468 | ||
4469 | exit_reg_apps: | |
4470 | ret = pthread_join(dispatch_thread, &status); | |
4471 | if (ret != 0) { | |
4472 | perror("pthread_join"); | |
4473 | goto error; /* join error, exit without cleanup */ | |
4474 | } | |
4475 | ||
4476 | exit_dispatch: | |
cf3af59e MD |
4477 | ret = pthread_join(client_thread, &status); |
4478 | if (ret != 0) { | |
4479 | perror("pthread_join"); | |
4480 | goto error; /* join error, exit without cleanup */ | |
4481 | } | |
4482 | ||
3bd1e081 | 4483 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4484 | if (ret != 0) { |
3bd1e081 | 4485 | perror("join_consumer"); |
cf3af59e MD |
4486 | goto error; /* join error, exit without cleanup */ |
4487 | } | |
a88df331 | 4488 | |
cf3af59e | 4489 | exit_client: |
a88df331 | 4490 | exit: |
cf3af59e MD |
4491 | /* |
4492 | * cleanup() is called when no other thread is running. | |
4493 | */ | |
f6a9efaa | 4494 | rcu_thread_online(); |
cf3af59e | 4495 | cleanup(); |
f6a9efaa DG |
4496 | rcu_thread_offline(); |
4497 | rcu_unregister_thread(); | |
cf3af59e MD |
4498 | if (!ret) |
4499 | exit(EXIT_SUCCESS); | |
4500 | error: | |
5e16da05 | 4501 | exit(EXIT_FAILURE); |
fac6795d | 4502 | } |