projects / lttng-tools.git / blob
? search:


dc43edb4d30a905e6c403c69b9fc3a35b1b7901c
[lttng-tools.git] / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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.
8 *
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.
13 *
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.
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>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
44
45 #include <lttngerr.h>
46
47 #include "channel.h"
48 #include "compat/poll.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "hashtable.h"
53 #include "kernel.h"
54 #include "lttng-sessiond.h"
55 #include "shm.h"
56 #include "ust-app.h"
57 #include "ust-ctl.h"
58 #include "utils.h"
59
60 #define CONSUMERD_FILE "lttng-consumerd"
61
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
80 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
83 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86 /* Variables */
87 int opt_verbose; /* Not static for lttngerr.h */
88 int opt_verbose_consumer; /* Not static for lttngerr.h */
89 int opt_quiet; /* Not static for lttngerr.h */
90
91 const char *progname;
92 const char *opt_tracing_group;
93 static int opt_sig_parent;
94 static int opt_daemon;
95 static int opt_no_kernel;
96 static int is_root; /* Set to 1 if the daemon is running as root */
97 static pid_t ppid; /* Parent PID for --sig-parent option */
98 static char *rundir;
99
100 /* Consumer daemon specific control data */
101 static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
103 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
115 };
116
117 static int dispatch_thread_exit;
118
119 /* Global application Unix socket path */
120 static char apps_unix_sock_path[PATH_MAX];
121 /* Global client Unix socket path */
122 static char client_unix_sock_path[PATH_MAX];
123 /* global wait shm path for UST */
124 static char wait_shm_path[PATH_MAX];
125
126 /* Sockets and FDs */
127 static int client_sock;
128 static int apps_sock;
129 static int kernel_tracer_fd;
130 static int kernel_poll_pipe[2];
131
132 /*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136 static int thread_quit_pipe[2];
137
138 /*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142 static int apps_cmd_pipe[2];
143
144 /* Pthread, Mutexes and Semaphores */
145 static pthread_t apps_thread;
146 static pthread_t reg_apps_thread;
147 static pthread_t client_thread;
148 static pthread_t kernel_thread;
149 static pthread_t dispatch_thread;
150
151
152 /*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159 static struct ust_cmd_queue ust_cmd_queue;
160
161 /*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
167 *
168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
169 * session_lock_list and session_unlock_list for lock acquisition.
170 */
171 static struct ltt_session_list *session_list_ptr;
172
173 int ust_consumerd64_fd = -1;
174 int ust_consumerd32_fd = -1;
175
176 static const char *consumerd32_bin =
177 __stringify(CONFIG_CONSUMERD32_BIN);
178 static const char *consumerd64_bin =
179 __stringify(CONFIG_CONSUMERD64_BIN);
180 static const char *consumerd32_libdir =
181 __stringify(CONFIG_CONSUMERD32_LIBDIR);
182 static const char *consumerd64_libdir =
183 __stringify(CONFIG_CONSUMERD64_LIBDIR);
184
185 static
186 void setup_consumerd_path(void)
187 {
188 const char *bin, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195 #if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202 #elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209 #else
210 #error "Unknown bitness"
211 #endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
223 }
224 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232 }
233
234 /*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237 static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239 {
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260 error:
261 return ret;
262 }
263
264 /*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269 static int check_thread_quit_pipe(int fd, uint32_t events)
270 {
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276 }
277
278 /*
279 * Remove modules in reverse load order.
280 */
281 static int modprobe_remove_kernel_modules(void)
282 {
283 int ret = 0, i;
284 char modprobe[256];
285
286 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
287 ret = snprintf(modprobe, sizeof(modprobe),
288 "/sbin/modprobe -r -q %s",
289 kernel_modules_list[i].name);
290 if (ret < 0) {
291 perror("snprintf modprobe -r");
292 goto error;
293 }
294 modprobe[sizeof(modprobe) - 1] = '\0';
295 ret = system(modprobe);
296 if (ret == -1) {
297 ERR("Unable to launch modprobe -r for module %s",
298 kernel_modules_list[i].name);
299 } else if (kernel_modules_list[i].required
300 && WEXITSTATUS(ret) != 0) {
301 ERR("Unable to remove module %s",
302 kernel_modules_list[i].name);
303 } else {
304 DBG("Modprobe removal successful %s",
305 kernel_modules_list[i].name);
306 }
307 }
308
309 error:
310 return ret;
311 }
312
313 /*
314 * Return group ID of the tracing group or -1 if not found.
315 */
316 static gid_t allowed_group(void)
317 {
318 struct group *grp;
319
320 if (opt_tracing_group) {
321 grp = getgrnam(opt_tracing_group);
322 } else {
323 grp = getgrnam(default_tracing_group);
324 }
325 if (!grp) {
326 return -1;
327 } else {
328 return grp->gr_gid;
329 }
330 }
331
332 /*
333 * Init thread quit pipe.
334 *
335 * Return -1 on error or 0 if all pipes are created.
336 */
337 static int init_thread_quit_pipe(void)
338 {
339 int ret;
340
341 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
342 if (ret < 0) {
343 perror("thread quit pipe");
344 goto error;
345 }
346
347 error:
348 return ret;
349 }
350
351 /*
352 * Complete teardown of a kernel session. This free all data structure related
353 * to a kernel session and update counter.
354 */
355 static void teardown_kernel_session(struct ltt_session *session)
356 {
357 if (!session->kernel_session) {
358 DBG3("No kernel session when tearingdown session");
359 return;
360 }
361
362 DBG("Tearing down kernel session");
363
364 /*
365 * If a custom kernel consumer was registered, close the socket before
366 * tearing down the complete kernel session structure
367 */
368 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
370 }
371
372 trace_kernel_destroy_session(session->kernel_session);
373 }
374
375 /*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379 static void teardown_ust_session(struct ltt_session *session)
380 {
381 int ret;
382
383 if (!session->ust_session) {
384 DBG3("No UST session when tearingdown session");
385 return;
386 }
387
388 DBG("Tearing down UST session(s)");
389
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
394
395 trace_ust_destroy_session(session->ust_session);
396 }
397
398 /*
399 * Stop all threads by closing the thread quit pipe.
400 */
401 static void stop_threads(void)
402 {
403 int ret;
404
405 /* Stopping all threads */
406 DBG("Terminating all threads");
407 ret = notify_thread_pipe(thread_quit_pipe[1]);
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
415 }
416
417 /*
418 * Cleanup the daemon
419 */
420 static void cleanup(void)
421 {
422 int ret;
423 char *cmd;
424 struct ltt_session *sess, *stmp;
425
426 DBG("Cleaning up");
427
428 DBG("Removing %s directory", rundir);
429 ret = asprintf(&cmd, "rm -rf %s", rundir);
430 if (ret < 0) {
431 ERR("asprintf failed. Something is really wrong!");
432 }
433
434 /* Remove lttng run directory */
435 ret = system(cmd);
436 if (ret < 0) {
437 ERR("Unable to clean %s", rundir);
438 }
439 free(cmd);
440
441 DBG("Cleaning up all session");
442
443 /* Destroy session list mutex */
444 if (session_list_ptr != NULL) {
445 pthread_mutex_destroy(&session_list_ptr->lock);
446
447 /* Cleanup ALL session */
448 cds_list_for_each_entry_safe(sess, stmp,
449 &session_list_ptr->head, list) {
450 teardown_kernel_session(sess);
451 teardown_ust_session(sess);
452 free(sess);
453 }
454 }
455
456 DBG("Closing all UST sockets");
457 ust_app_clean_list();
458
459 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
460
461 if (is_root && !opt_no_kernel) {
462 DBG2("Closing kernel fd");
463 close(kernel_tracer_fd);
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 DBG("%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> */
476 }
477
478 /*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
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
493 /*
494 * Free memory of a command context structure.
495 */
496 static void clean_command_ctx(struct command_ctx **cmd_ctx)
497 {
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509 }
510
511 /*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516 {
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
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 */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
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;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566 error:
567 return ret;
568 }
569
570 /*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575 {
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session->consumer_fd == 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd != 0) {
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);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
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
638 /*
639 * Notify UST applications using the shm mmap futex.
640 */
641 static int notify_ust_apps(int active)
642 {
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
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) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659 error:
660 return -1;
661 }
662
663 /*
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.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671 {
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692 error:
693 return ret;
694 }
695
696 /*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700 static int update_kernel_poll(struct lttng_poll_event *events)
701 {
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732 error:
733 session_unlock_list();
734 return -1;
735 }
736
737 /*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
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
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
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.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793 error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797 }
798
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) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812 }
813
814 /*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820 static void *thread_manage_kernel(void *data)
821 {
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
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
839 while (1) {
840 if (update_poll_flag == 1) {
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
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
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);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
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);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
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) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
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 */
903 }
904 }
905 }
906 }
907
908 error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916 }
917
918 /*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921 static void *thread_manage_consumer(void *data)
922 {
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
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 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
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 */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
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);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
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) {
1026 goto error;
1027 }
1028
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)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059 error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072 }
1073
1074 /*
1075 * This thread manage application communication.
1076 */
1077 static void *thread_manage_apps(void *data)
1078 {
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
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) {
1121 goto error;
1122 }
1123
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");
1128 goto error;
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 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
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
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 */
1158 ust_app_unregister(ust_cmd.sock);
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
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
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 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195 error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
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) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
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);
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)
1275 {
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
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;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
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 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
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);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
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 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
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 }
1371
1372 ust_cmd->sock = sock;
1373
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);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
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 }
1394 }
1395 }
1396
1397 error:
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);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410 }
1411
1412 /*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417 {
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
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 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478 error:
1479 return ret;
1480 }
1481
1482 /*
1483 * Join consumer thread
1484 */
1485 static int join_consumer_thread(struct consumer_data *consumer_data)
1486 {
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500 }
1501
1502 /*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508 {
1509 int ret;
1510 pid_t pid;
1511 const char *consumer_to_use;
1512 const char *verbosity;
1513 struct stat st;
1514
1515 DBG("Spawning consumerd");
1516
1517 pid = fork();
1518 if (pid == 0) {
1519 /*
1520 * Exec consumerd.
1521 */
1522 if (opt_verbose > 1 || opt_verbose_consumer) {
1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
1529 /*
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,
1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
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);
1550 break;
1551 case LTTNG_CONSUMER64_UST:
1552 {
1553 char *tmpnew = NULL;
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 }
1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1583 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
1593 break;
1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
1597 char *tmpnew = NULL;
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 }
1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1627 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
1637 break;
1638 }
1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
1649 } else {
1650 perror("start consumer fork");
1651 ret = -errno;
1652 }
1653 error:
1654 return ret;
1655 }
1656
1657 /*
1658 * Spawn the consumerd daemon and session daemon thread.
1659 */
1660 static int start_consumerd(struct consumer_data *consumer_data)
1661 {
1662 int ret;
1663
1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
1667 goto end;
1668 }
1669
1670 ret = spawn_consumerd(consumer_data);
1671 if (ret < 0) {
1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
1674 goto error;
1675 }
1676
1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
1679 DBG2("Consumer pid %d", consumer_data->pid);
1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
1681
1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
1684 if (ret < 0) {
1685 ERR("Fatal error spawning consumer control thread");
1686 goto error;
1687 }
1688
1689 end:
1690 return 0;
1691
1692 error:
1693 return ret;
1694 }
1695
1696 /*
1697 * modprobe_kernel_modules
1698 */
1699 static int modprobe_kernel_modules(void)
1700 {
1701 int ret = 0, i;
1702 char modprobe[256];
1703
1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
1707 kernel_modules_list[i].required ? "" : "-q ",
1708 kernel_modules_list[i].name);
1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
1713 modprobe[sizeof(modprobe) - 1] = '\0';
1714 ret = system(modprobe);
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
1719 && WEXITSTATUS(ret) != 0) {
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
1732 /*
1733 * mount_debugfs
1734 */
1735 static int mount_debugfs(char *path)
1736 {
1737 int ret;
1738 char *type = "debugfs";
1739
1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1741 if (ret < 0) {
1742 PERROR("Cannot create debugfs path");
1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
1748 PERROR("Cannot mount debugfs");
1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754 error:
1755 return ret;
1756 }
1757
1758 /*
1759 * Setup necessary data for kernel tracer action.
1760 */
1761 static void init_kernel_tracer(void)
1762 {
1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
1766 char *debugfs_path = NULL, *lttng_path = NULL;
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) {
1798 perror("Cannot mount debugfs");
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(&lttng_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);
1818 if (kernel_tracer_fd < 0) {
1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
1821 }
1822
1823 free(lttng_path);
1824 free(debugfs_path);
1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
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;
1838 }
1839
1840 /*
1841 * Init tracing by creating trace directory and sending fds kernel consumer.
1842 */
1843 static int init_kernel_tracing(struct ltt_kernel_session *session)
1844 {
1845 int ret = 0;
1846
1847 if (session->consumer_fds_sent == 0) {
1848 /*
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.
1852 */
1853 if (session->consumer_fd == 0) {
1854 session->consumer_fd = kconsumer_data.cmd_sock;
1855 }
1856
1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1858 if (ret < 0) {
1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1862
1863 session->consumer_fds_sent = 1;
1864 }
1865
1866 error:
1867 return ret;
1868 }
1869
1870 /*
1871 * Create an UST session and add it to the session ust list.
1872 */
1873 static int create_ust_session(struct ltt_session *session,
1874 struct lttng_domain *domain, struct ucred *creds)
1875 {
1876 int ret;
1877 unsigned int sess_uid;
1878 gid_t gid;
1879 struct ltt_ust_session *lus = NULL;
1880
1881 switch (domain->type) {
1882 case LTTNG_DOMAIN_UST:
1883 break;
1884 default:
1885 ret = LTTCOMM_UNKNOWN_DOMAIN;
1886 goto error;
1887 }
1888
1889 DBG("Creating UST session");
1890
1891 sess_uid = session->uid;
1892 lus = trace_ust_create_session(session->path, sess_uid, domain);
1893 if (lus == NULL) {
1894 ret = LTTCOMM_UST_SESS_FAIL;
1895 goto error;
1896 }
1897
1898 /*
1899 * Get the right group ID. To use the tracing group, the daemon must be
1900 * running with root credentials or else it's the user GID used.
1901 */
1902 gid = allowed_group();
1903 if (gid < 0 || !is_root) {
1904 gid = creds->gid;
1905 }
1906
1907 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, creds->uid, gid);
1908 if (ret < 0) {
1909 if (ret != -EEXIST) {
1910 ERR("Trace directory creation error");
1911 ret = LTTCOMM_UST_SESS_FAIL;
1912 goto error;
1913 }
1914 }
1915
1916 /* The domain type dictate different actions on session creation */
1917 switch (domain->type) {
1918 case LTTNG_DOMAIN_UST:
1919 /* No ustctl for the global UST domain */
1920 break;
1921 default:
1922 ERR("Unknown UST domain on create session %d", domain->type);
1923 goto error;
1924 }
1925 session->ust_session = lus;
1926
1927 return LTTCOMM_OK;
1928
1929 error:
1930 free(lus);
1931 return ret;
1932 }
1933
1934 /*
1935 * Create a kernel tracer session then create the default channel.
1936 */
1937 static int create_kernel_session(struct ltt_session *session,
1938 struct ucred *creds)
1939 {
1940 int ret;
1941 gid_t gid;
1942
1943 DBG("Creating kernel session");
1944
1945 ret = kernel_create_session(session, kernel_tracer_fd);
1946 if (ret < 0) {
1947 ret = LTTCOMM_KERN_SESS_FAIL;
1948 goto error;
1949 }
1950
1951 /* Set kernel consumer socket fd */
1952 if (kconsumer_data.cmd_sock) {
1953 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1954 }
1955
1956 gid = allowed_group();
1957 if (gid < 0) {
1958 /*
1959 * Use GID 0 has a fallback since kernel session is only allowed under
1960 * root or the gid of the calling user
1961 */
1962 is_root ? (gid = 0) : (gid = creds->gid);
1963 }
1964
1965 ret = mkdir_recursive(session->kernel_session->trace_path,
1966 S_IRWXU | S_IRWXG, creds->uid, gid);
1967 if (ret < 0) {
1968 if (ret != -EEXIST) {
1969 ERR("Trace directory creation error");
1970 goto error;
1971 }
1972 }
1973
1974 error:
1975 return ret;
1976 }
1977
1978 /*
1979 * Using the session list, filled a lttng_session array to send back to the
1980 * client for session listing.
1981 *
1982 * The session list lock MUST be acquired before calling this function. Use
1983 * session_lock_list() and session_unlock_list().
1984 */
1985 static void list_lttng_sessions(struct lttng_session *sessions)
1986 {
1987 int i = 0;
1988 struct ltt_session *session;
1989
1990 DBG("Getting all available session");
1991 /*
1992 * Iterate over session list and append data after the control struct in
1993 * the buffer.
1994 */
1995 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1996 strncpy(sessions[i].path, session->path, PATH_MAX);
1997 sessions[i].path[PATH_MAX - 1] = '\0';
1998 strncpy(sessions[i].name, session->name, NAME_MAX);
1999 sessions[i].name[NAME_MAX - 1] = '\0';
2000 sessions[i].enabled = session->enabled;
2001 i++;
2002 }
2003 }
2004
2005 /*
2006 * Fill lttng_channel array of all channels.
2007 */
2008 static void list_lttng_channels(int domain, struct ltt_session *session,
2009 struct lttng_channel *channels)
2010 {
2011 int i = 0;
2012 struct ltt_kernel_channel *kchan;
2013
2014 DBG("Listing channels for session %s", session->name);
2015
2016 switch (domain) {
2017 case LTTNG_DOMAIN_KERNEL:
2018 /* Kernel channels */
2019 if (session->kernel_session != NULL) {
2020 cds_list_for_each_entry(kchan,
2021 &session->kernel_session->channel_list.head, list) {
2022 /* Copy lttng_channel struct to array */
2023 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2024 channels[i].enabled = kchan->enabled;
2025 i++;
2026 }
2027 }
2028 break;
2029 case LTTNG_DOMAIN_UST:
2030 {
2031 struct cds_lfht_iter iter;
2032 struct ltt_ust_channel *uchan;
2033
2034 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2035 &iter, uchan, node) {
2036 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2037 channels[i].attr.overwrite = uchan->attr.overwrite;
2038 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2039 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2040 channels[i].attr.switch_timer_interval =
2041 uchan->attr.switch_timer_interval;
2042 channels[i].attr.read_timer_interval =
2043 uchan->attr.read_timer_interval;
2044 channels[i].enabled = uchan->enabled;
2045 switch (uchan->attr.output) {
2046 case LTTNG_UST_MMAP:
2047 default:
2048 channels[i].attr.output = LTTNG_EVENT_MMAP;
2049 break;
2050 }
2051 i++;
2052 }
2053 break;
2054 }
2055 default:
2056 break;
2057 }
2058 }
2059
2060 /*
2061 * Create a list of ust global domain events.
2062 */
2063 static int list_lttng_ust_global_events(char *channel_name,
2064 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2065 {
2066 int i = 0, ret = 0;
2067 unsigned int nb_event = 0;
2068 struct cds_lfht_iter iter;
2069 struct cds_lfht_node *node;
2070 struct ltt_ust_channel *uchan;
2071 struct ltt_ust_event *uevent;
2072 struct lttng_event *tmp;
2073
2074 DBG("Listing UST global events for channel %s", channel_name);
2075
2076 rcu_read_lock();
2077
2078 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2079 strlen(channel_name), &iter);
2080 if (node == NULL) {
2081 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2082 goto error;
2083 }
2084
2085 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2086
2087 nb_event += hashtable_get_count(uchan->events);
2088
2089 if (nb_event == 0) {
2090 ret = nb_event;
2091 goto error;
2092 }
2093
2094 DBG3("Listing UST global %d events", nb_event);
2095
2096 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2097 if (tmp == NULL) {
2098 ret = -LTTCOMM_FATAL;
2099 goto error;
2100 }
2101
2102 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2103 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2104 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2105 tmp[i].enabled = uevent->enabled;
2106 switch (uevent->attr.instrumentation) {
2107 case LTTNG_UST_TRACEPOINT:
2108 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2109 break;
2110 case LTTNG_UST_PROBE:
2111 tmp[i].type = LTTNG_EVENT_PROBE;
2112 break;
2113 case LTTNG_UST_FUNCTION:
2114 tmp[i].type = LTTNG_EVENT_FUNCTION;
2115 break;
2116 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2117 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2118 break;
2119 }
2120 i++;
2121 }
2122
2123 ret = nb_event;
2124 *events = tmp;
2125
2126 error:
2127 rcu_read_unlock();
2128 return ret;
2129 }
2130
2131 /*
2132 * Fill lttng_event array of all kernel events in the channel.
2133 */
2134 static int list_lttng_kernel_events(char *channel_name,
2135 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2136 {
2137 int i = 0, ret;
2138 unsigned int nb_event;
2139 struct ltt_kernel_event *event;
2140 struct ltt_kernel_channel *kchan;
2141
2142 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2143 if (kchan == NULL) {
2144 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2145 goto error;
2146 }
2147
2148 nb_event = kchan->event_count;
2149
2150 DBG("Listing events for channel %s", kchan->channel->name);
2151
2152 if (nb_event == 0) {
2153 ret = nb_event;
2154 goto error;
2155 }
2156
2157 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2158 if (*events == NULL) {
2159 ret = LTTCOMM_FATAL;
2160 goto error;
2161 }
2162
2163 /* Kernel channels */
2164 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2165 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2166 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2167 (*events)[i].enabled = event->enabled;
2168 switch (event->event->instrumentation) {
2169 case LTTNG_KERNEL_TRACEPOINT:
2170 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2171 break;
2172 case LTTNG_KERNEL_KPROBE:
2173 case LTTNG_KERNEL_KRETPROBE:
2174 (*events)[i].type = LTTNG_EVENT_PROBE;
2175 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2176 sizeof(struct lttng_kernel_kprobe));
2177 break;
2178 case LTTNG_KERNEL_FUNCTION:
2179 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2180 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2181 sizeof(struct lttng_kernel_function));
2182 break;
2183 case LTTNG_KERNEL_NOOP:
2184 (*events)[i].type = LTTNG_EVENT_NOOP;
2185 break;
2186 case LTTNG_KERNEL_SYSCALL:
2187 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2188 break;
2189 case LTTNG_KERNEL_ALL:
2190 assert(0);
2191 break;
2192 }
2193 i++;
2194 }
2195
2196 return nb_event;
2197
2198 error:
2199 return ret;
2200 }
2201
2202 /*
2203 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2204 */
2205 static int cmd_disable_channel(struct ltt_session *session,
2206 int domain, char *channel_name)
2207 {
2208 int ret;
2209 struct ltt_ust_session *usess;
2210
2211 usess = session->ust_session;
2212
2213 switch (domain) {
2214 case LTTNG_DOMAIN_KERNEL:
2215 {
2216 ret = channel_kernel_disable(session->kernel_session,
2217 channel_name);
2218 if (ret != LTTCOMM_OK) {
2219 goto error;
2220 }
2221
2222 kernel_wait_quiescent(kernel_tracer_fd);
2223 break;
2224 }
2225 case LTTNG_DOMAIN_UST:
2226 {
2227 struct ltt_ust_channel *uchan;
2228 struct cds_lfht *chan_ht;
2229
2230 chan_ht = usess->domain_global.channels;
2231
2232 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2233 if (uchan == NULL) {
2234 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2235 goto error;
2236 }
2237
2238 ret = channel_ust_disable(usess, domain, uchan);
2239 if (ret != LTTCOMM_OK) {
2240 goto error;
2241 }
2242 break;
2243 }
2244 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2245 case LTTNG_DOMAIN_UST_EXEC_NAME:
2246 case LTTNG_DOMAIN_UST_PID:
2247 ret = LTTCOMM_NOT_IMPLEMENTED;
2248 goto error;
2249 default:
2250 ret = LTTCOMM_UNKNOWN_DOMAIN;
2251 goto error;
2252 }
2253
2254 ret = LTTCOMM_OK;
2255
2256 error:
2257 return ret;
2258 }
2259
2260 /*
2261 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2262 */
2263 static int cmd_enable_channel(struct ltt_session *session,
2264 int domain, struct lttng_channel *attr)
2265 {
2266 int ret;
2267 struct ltt_ust_session *usess = session->ust_session;
2268 struct cds_lfht *chan_ht;
2269
2270 DBG("Enabling channel %s for session %s", attr->name, session->name);
2271
2272 switch (domain) {
2273 case LTTNG_DOMAIN_KERNEL:
2274 {
2275 struct ltt_kernel_channel *kchan;
2276
2277 kchan = trace_kernel_get_channel_by_name(attr->name,
2278 session->kernel_session);
2279 if (kchan == NULL) {
2280 ret = channel_kernel_create(session->kernel_session,
2281 attr, kernel_poll_pipe[1]);
2282 } else {
2283 ret = channel_kernel_enable(session->kernel_session, kchan);
2284 }
2285
2286 if (ret != LTTCOMM_OK) {
2287 goto error;
2288 }
2289
2290 kernel_wait_quiescent(kernel_tracer_fd);
2291 break;
2292 }
2293 case LTTNG_DOMAIN_UST:
2294 {
2295 struct ltt_ust_channel *uchan;
2296
2297 chan_ht = usess->domain_global.channels;
2298
2299 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2300 if (uchan == NULL) {
2301 ret = channel_ust_create(usess, domain, attr);
2302 } else {
2303 ret = channel_ust_enable(usess, domain, uchan);
2304 }
2305 break;
2306 }
2307 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2308 case LTTNG_DOMAIN_UST_EXEC_NAME:
2309 case LTTNG_DOMAIN_UST_PID:
2310 ret = LTTCOMM_NOT_IMPLEMENTED;
2311 goto error;
2312 default:
2313 ret = LTTCOMM_UNKNOWN_DOMAIN;
2314 goto error;
2315 }
2316
2317 error:
2318 return ret;
2319 }
2320
2321 /*
2322 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2323 */
2324 static int cmd_disable_event(struct ltt_session *session, int domain,
2325 char *channel_name, char *event_name)
2326 {
2327 int ret;
2328
2329 switch (domain) {
2330 case LTTNG_DOMAIN_KERNEL:
2331 {
2332 struct ltt_kernel_channel *kchan;
2333 struct ltt_kernel_session *ksess;
2334
2335 ksess = session->kernel_session;
2336
2337 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2338 if (kchan == NULL) {
2339 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2340 goto error;
2341 }
2342
2343 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2344 if (ret != LTTCOMM_OK) {
2345 goto error;
2346 }
2347
2348 kernel_wait_quiescent(kernel_tracer_fd);
2349 break;
2350 }
2351 case LTTNG_DOMAIN_UST:
2352 {
2353 struct ltt_ust_channel *uchan;
2354 struct ltt_ust_session *usess;
2355
2356 usess = session->ust_session;
2357
2358 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2359 channel_name);
2360 if (uchan == NULL) {
2361 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2362 goto error;
2363 }
2364
2365 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2366 if (ret != LTTCOMM_OK) {
2367 goto error;
2368 }
2369
2370 DBG3("Disable UST event %s in channel %s completed", event_name,
2371 channel_name);
2372 break;
2373 }
2374 case LTTNG_DOMAIN_UST_EXEC_NAME:
2375 case LTTNG_DOMAIN_UST_PID:
2376 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2377 default:
2378 ret = LTTCOMM_NOT_IMPLEMENTED;
2379 goto error;
2380 }
2381
2382 ret = LTTCOMM_OK;
2383
2384 error:
2385 return ret;
2386 }
2387
2388 /*
2389 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2390 */
2391 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2392 char *channel_name)
2393 {
2394 int ret;
2395
2396 switch (domain) {
2397 case LTTNG_DOMAIN_KERNEL:
2398 {
2399 struct ltt_kernel_session *ksess;
2400 struct ltt_kernel_channel *kchan;
2401
2402 ksess = session->kernel_session;
2403
2404 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2405 if (kchan == NULL) {
2406 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2407 goto error;
2408 }
2409
2410 ret = event_kernel_disable_all(ksess, kchan);
2411 if (ret != LTTCOMM_OK) {
2412 goto error;
2413 }
2414
2415 kernel_wait_quiescent(kernel_tracer_fd);
2416 break;
2417 }
2418 case LTTNG_DOMAIN_UST:
2419 {
2420 struct ltt_ust_session *usess;
2421 struct ltt_ust_channel *uchan;
2422
2423 usess = session->ust_session;
2424
2425 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2426 channel_name);
2427 if (uchan == NULL) {
2428 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2429 goto error;
2430 }
2431
2432 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2433 if (ret != 0) {
2434 goto error;
2435 }
2436
2437 DBG3("Disable all UST events in channel %s completed", channel_name);
2438
2439 break;
2440 }
2441 case LTTNG_DOMAIN_UST_EXEC_NAME:
2442 case LTTNG_DOMAIN_UST_PID:
2443 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2444 default:
2445 ret = LTTCOMM_NOT_IMPLEMENTED;
2446 goto error;
2447 }
2448
2449 ret = LTTCOMM_OK;
2450
2451 error:
2452 return ret;
2453 }
2454
2455 /*
2456 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2457 */
2458 static int cmd_add_context(struct ltt_session *session, int domain,
2459 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2460 {
2461 int ret;
2462
2463 switch (domain) {
2464 case LTTNG_DOMAIN_KERNEL:
2465 /* Add kernel context to kernel tracer */
2466 ret = context_kernel_add(session->kernel_session, ctx,
2467 event_name, channel_name);
2468 if (ret != LTTCOMM_OK) {
2469 goto error;
2470 }
2471 break;
2472 case LTTNG_DOMAIN_UST:
2473 {
2474 struct ltt_ust_session *usess = session->ust_session;
2475
2476 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2477 if (ret != LTTCOMM_OK) {
2478 goto error;
2479 }
2480 break;
2481 }
2482 case LTTNG_DOMAIN_UST_EXEC_NAME:
2483 case LTTNG_DOMAIN_UST_PID:
2484 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2485 default:
2486 ret = LTTCOMM_NOT_IMPLEMENTED;
2487 goto error;
2488 }
2489
2490 ret = LTTCOMM_OK;
2491
2492 error:
2493 return ret;
2494 }
2495
2496 /*
2497 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2498 *
2499 * TODO: currently, both events and loglevels are kept within the same
2500 * namespace for UST global registry/app registery, so if an event
2501 * happen to have the same name as the loglevel (very unlikely though),
2502 * and an attempt is made to enable/disable both in the same session,
2503 * the first to be created will be the only one allowed to exist.
2504 */
2505 static int cmd_enable_event(struct ltt_session *session, int domain,
2506 char *channel_name, struct lttng_event *event)
2507 {
2508 int ret;
2509 struct lttng_channel *attr;
2510 struct ltt_ust_session *usess = session->ust_session;
2511
2512 switch (domain) {
2513 case LTTNG_DOMAIN_KERNEL:
2514 {
2515 struct ltt_kernel_channel *kchan;
2516
2517 kchan = trace_kernel_get_channel_by_name(channel_name,
2518 session->kernel_session);
2519 if (kchan == NULL) {
2520 attr = channel_new_default_attr(domain);
2521 if (attr == NULL) {
2522 ret = LTTCOMM_FATAL;
2523 goto error;
2524 }
2525 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2526
2527 /* This call will notify the kernel thread */
2528 ret = channel_kernel_create(session->kernel_session,
2529 attr, kernel_poll_pipe[1]);
2530 if (ret != LTTCOMM_OK) {
2531 free(attr);
2532 goto error;
2533 }
2534 free(attr);
2535 }
2536
2537 /* Get the newly created kernel channel pointer */
2538 kchan = trace_kernel_get_channel_by_name(channel_name,
2539 session->kernel_session);
2540 if (kchan == NULL) {
2541 /* This sould not happen... */
2542 ret = LTTCOMM_FATAL;
2543 goto error;
2544 }
2545
2546 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2547 event);
2548 if (ret != LTTCOMM_OK) {
2549 goto error;
2550 }
2551
2552 kernel_wait_quiescent(kernel_tracer_fd);
2553 break;
2554 }
2555 case LTTNG_DOMAIN_UST:
2556 {
2557 struct lttng_channel *attr;
2558 struct ltt_ust_channel *uchan;
2559
2560 /* Get channel from global UST domain */
2561 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2562 channel_name);
2563 if (uchan == NULL) {
2564 /* Create default channel */
2565 attr = channel_new_default_attr(domain);
2566 if (attr == NULL) {
2567 ret = LTTCOMM_FATAL;
2568 goto error;
2569 }
2570 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2571 attr->name[NAME_MAX - 1] = '\0';
2572
2573 ret = channel_ust_create(usess, domain, attr);
2574 if (ret != LTTCOMM_OK) {
2575 free(attr);
2576 goto error;
2577 }
2578 free(attr);
2579
2580 /* Get the newly created channel reference back */
2581 uchan = trace_ust_find_channel_by_name(
2582 usess->domain_global.channels, channel_name);
2583 if (uchan == NULL) {
2584 /* Something is really wrong */
2585 ret = LTTCOMM_FATAL;
2586 goto error;
2587 }
2588 }
2589
2590 /* At this point, the session and channel exist on the tracer */
2591
2592 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2593 if (ret != LTTCOMM_OK) {
2594 goto error;
2595 }
2596 break;
2597 }
2598 case LTTNG_DOMAIN_UST_EXEC_NAME:
2599 case LTTNG_DOMAIN_UST_PID:
2600 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2601 default:
2602 ret = LTTCOMM_NOT_IMPLEMENTED;
2603 goto error;
2604 }
2605
2606 ret = LTTCOMM_OK;
2607
2608 error:
2609 return ret;
2610 }
2611
2612 /*
2613 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2614 */
2615 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2616 char *channel_name, int event_type)
2617 {
2618 int ret;
2619 struct ltt_kernel_channel *kchan;
2620
2621 switch (domain) {
2622 case LTTNG_DOMAIN_KERNEL:
2623 kchan = trace_kernel_get_channel_by_name(channel_name,
2624 session->kernel_session);
2625 if (kchan == NULL) {
2626 /* This call will notify the kernel thread */
2627 ret = channel_kernel_create(session->kernel_session, NULL,
2628 kernel_poll_pipe[1]);
2629 if (ret != LTTCOMM_OK) {
2630 goto error;
2631 }
2632
2633 /* Get the newly created kernel channel pointer */
2634 kchan = trace_kernel_get_channel_by_name(channel_name,
2635 session->kernel_session);
2636 if (kchan == NULL) {
2637 /* This sould not happen... */
2638 ret = LTTCOMM_FATAL;
2639 goto error;
2640 }
2641
2642 }
2643
2644 switch (event_type) {
2645 case LTTNG_EVENT_SYSCALL:
2646 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2647 kchan, kernel_tracer_fd);
2648 break;
2649 case LTTNG_EVENT_TRACEPOINT:
2650 /*
2651 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2652 * events already registered to the channel.
2653 */
2654 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2655 kchan, kernel_tracer_fd);
2656 break;
2657 case LTTNG_EVENT_ALL:
2658 /* Enable syscalls and tracepoints */
2659 ret = event_kernel_enable_all(session->kernel_session,
2660 kchan, kernel_tracer_fd);
2661 break;
2662 default:
2663 ret = LTTCOMM_KERN_ENABLE_FAIL;
2664 goto error;
2665 }
2666
2667 /* Manage return value */
2668 if (ret != LTTCOMM_OK) {
2669 goto error;
2670 }
2671
2672 kernel_wait_quiescent(kernel_tracer_fd);
2673 break;
2674 case LTTNG_DOMAIN_UST:
2675 {
2676 struct lttng_channel *attr;
2677 struct ltt_ust_channel *uchan;
2678 struct ltt_ust_session *usess = session->ust_session;
2679
2680 /* Get channel from global UST domain */
2681 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2682 channel_name);
2683 if (uchan == NULL) {
2684 /* Create default channel */
2685 attr = channel_new_default_attr(domain);
2686 if (attr == NULL) {
2687 ret = LTTCOMM_FATAL;
2688 goto error;
2689 }
2690 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2691 attr->name[NAME_MAX - 1] = '\0';
2692
2693 /* Use the internal command enable channel */
2694 ret = channel_ust_create(usess, domain, attr);
2695 if (ret != LTTCOMM_OK) {
2696 free(attr);
2697 goto error;
2698 }
2699 free(attr);
2700
2701 /* Get the newly created channel reference back */
2702 uchan = trace_ust_find_channel_by_name(
2703 usess->domain_global.channels, channel_name);
2704 if (uchan == NULL) {
2705 /* Something is really wrong */
2706 ret = LTTCOMM_FATAL;
2707 goto error;
2708 }
2709 }
2710
2711 /* At this point, the session and channel exist on the tracer */
2712
2713 switch (event_type) {
2714 case LTTNG_EVENT_ALL:
2715 case LTTNG_EVENT_TRACEPOINT:
2716 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2717 if (ret != LTTCOMM_OK) {
2718 goto error;
2719 }
2720 break;
2721 default:
2722 ret = LTTCOMM_UST_ENABLE_FAIL;
2723 goto error;
2724 }
2725
2726 /* Manage return value */
2727 if (ret != LTTCOMM_OK) {
2728 goto error;
2729 }
2730
2731 break;
2732 }
2733 case LTTNG_DOMAIN_UST_EXEC_NAME:
2734 case LTTNG_DOMAIN_UST_PID:
2735 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2736 default:
2737 ret = LTTCOMM_NOT_IMPLEMENTED;
2738 goto error;
2739 }
2740
2741 ret = LTTCOMM_OK;
2742
2743 error:
2744 return ret;
2745 }
2746
2747 /*
2748 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2749 */
2750 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2751 {
2752 int ret;
2753 ssize_t nb_events = 0;
2754
2755 switch (domain) {
2756 case LTTNG_DOMAIN_KERNEL:
2757 nb_events = kernel_list_events(kernel_tracer_fd, events);
2758 if (nb_events < 0) {
2759 ret = LTTCOMM_KERN_LIST_FAIL;
2760 goto error;
2761 }
2762 break;
2763 case LTTNG_DOMAIN_UST:
2764 nb_events = ust_app_list_events(events);
2765 if (nb_events < 0) {
2766 ret = LTTCOMM_UST_LIST_FAIL;
2767 goto error;
2768 }
2769 break;
2770 default:
2771 ret = LTTCOMM_NOT_IMPLEMENTED;
2772 goto error;
2773 }
2774
2775 return nb_events;
2776
2777 error:
2778 /* Return negative value to differentiate return code */
2779 return -ret;
2780 }
2781
2782 /*
2783 * Command LTTNG_START_TRACE processed by the client thread.
2784 */
2785 static int cmd_start_trace(struct ltt_session *session)
2786 {
2787 int ret;
2788 struct ltt_kernel_session *ksession;
2789 struct ltt_ust_session *usess;
2790
2791 /* Short cut */
2792 ksession = session->kernel_session;
2793 usess = session->ust_session;
2794
2795 if (session->enabled) {
2796 ret = LTTCOMM_UST_START_FAIL;
2797 goto error;
2798 }
2799
2800 session->enabled = 1;
2801
2802 /* Kernel tracing */
2803 if (ksession != NULL) {
2804 struct ltt_kernel_channel *kchan;
2805
2806 /* Open kernel metadata */
2807 if (ksession->metadata == NULL) {
2808 ret = kernel_open_metadata(ksession, ksession->trace_path);
2809 if (ret < 0) {
2810 ret = LTTCOMM_KERN_META_FAIL;
2811 goto error;
2812 }
2813 }
2814
2815 /* Open kernel metadata stream */
2816 if (ksession->metadata_stream_fd == 0) {
2817 ret = kernel_open_metadata_stream(ksession);
2818 if (ret < 0) {
2819 ERR("Kernel create metadata stream failed");
2820 ret = LTTCOMM_KERN_STREAM_FAIL;
2821 goto error;
2822 }
2823 }
2824
2825 /* For each channel */
2826 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2827 if (kchan->stream_count == 0) {
2828 ret = kernel_open_channel_stream(kchan);
2829 if (ret < 0) {
2830 ret = LTTCOMM_KERN_STREAM_FAIL;
2831 goto error;
2832 }
2833 /* Update the stream global counter */
2834 ksession->stream_count_global += ret;
2835 }
2836 }
2837
2838 /* Setup kernel consumer socket and send fds to it */
2839 ret = init_kernel_tracing(ksession);
2840 if (ret < 0) {
2841 ret = LTTCOMM_KERN_START_FAIL;
2842 goto error;
2843 }
2844
2845 /* This start the kernel tracing */
2846 ret = kernel_start_session(ksession);
2847 if (ret < 0) {
2848 ret = LTTCOMM_KERN_START_FAIL;
2849 goto error;
2850 }
2851
2852 /* Quiescent wait after starting trace */
2853 kernel_wait_quiescent(kernel_tracer_fd);
2854 }
2855
2856 /* Flag session that trace should start automatically */
2857 if (usess) {
2858 usess->start_trace = 1;
2859
2860 ret = ust_app_start_trace_all(usess);
2861 if (ret < 0) {
2862 ret = LTTCOMM_UST_START_FAIL;
2863 goto error;
2864 }
2865 }
2866
2867 ret = LTTCOMM_OK;
2868
2869 error:
2870 return ret;
2871 }
2872
2873 /*
2874 * Command LTTNG_STOP_TRACE processed by the client thread.
2875 */
2876 static int cmd_stop_trace(struct ltt_session *session)
2877 {
2878 int ret;
2879 struct ltt_kernel_channel *kchan;
2880 struct ltt_kernel_session *ksession;
2881 struct ltt_ust_session *usess;
2882
2883 /* Short cut */
2884 ksession = session->kernel_session;
2885 usess = session->ust_session;
2886
2887 if (!session->enabled) {
2888 ret = LTTCOMM_UST_START_FAIL;
2889 goto error;
2890 }
2891
2892 session->enabled = 0;
2893
2894 /* Kernel tracer */
2895 if (ksession != NULL) {
2896 DBG("Stop kernel tracing");
2897
2898 /* Flush all buffers before stopping */
2899 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2900 if (ret < 0) {
2901 ERR("Kernel metadata flush failed");
2902 }
2903
2904 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2905 ret = kernel_flush_buffer(kchan);
2906 if (ret < 0) {
2907 ERR("Kernel flush buffer error");
2908 }
2909 }
2910
2911 ret = kernel_stop_session(ksession);
2912 if (ret < 0) {
2913 ret = LTTCOMM_KERN_STOP_FAIL;
2914 goto error;
2915 }
2916
2917 kernel_wait_quiescent(kernel_tracer_fd);
2918 }
2919
2920 if (usess) {
2921 usess->start_trace = 0;
2922
2923 ret = ust_app_stop_trace_all(usess);
2924 if (ret < 0) {
2925 ret = LTTCOMM_UST_START_FAIL;
2926 goto error;
2927 }
2928 }
2929
2930 ret = LTTCOMM_OK;
2931
2932 error:
2933 return ret;
2934 }
2935
2936 /*
2937 * Command LTTNG_CREATE_SESSION processed by the client thread.
2938 */
2939 static int cmd_create_session(char *name, char *path)
2940 {
2941 int ret;
2942
2943 ret = session_create(name, path);
2944 if (ret != LTTCOMM_OK) {
2945 goto error;
2946 }
2947
2948 ret = LTTCOMM_OK;
2949
2950 error:
2951 return ret;
2952 }
2953
2954 /*
2955 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2956 */
2957 static int cmd_destroy_session(struct ltt_session *session, char *name)
2958 {
2959 int ret;
2960
2961 /* Clean kernel session teardown */
2962 teardown_kernel_session(session);
2963 /* UST session teardown */
2964 teardown_ust_session(session);
2965
2966 /*
2967 * Must notify the kernel thread here to update it's poll setin order
2968 * to remove the channel(s)' fd just destroyed.
2969 */
2970 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2971 if (ret < 0) {
2972 perror("write kernel poll pipe");
2973 }
2974
2975 ret = session_destroy(session);
2976
2977 return ret;
2978 }
2979
2980 /*
2981 * Command LTTNG_CALIBRATE processed by the client thread.
2982 */
2983 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2984 {
2985 int ret;
2986
2987 switch (domain) {
2988 case LTTNG_DOMAIN_KERNEL:
2989 {
2990 struct lttng_kernel_calibrate kcalibrate;
2991
2992 kcalibrate.type = calibrate->type;
2993 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2994 if (ret < 0) {
2995 ret = LTTCOMM_KERN_ENABLE_FAIL;
2996 goto error;
2997 }
2998 break;
2999 }
3000 default:
3001 /* TODO: Userspace tracing */
3002 ret = LTTCOMM_NOT_IMPLEMENTED;
3003 goto error;
3004 }
3005
3006 ret = LTTCOMM_OK;
3007
3008 error:
3009 return ret;
3010 }
3011
3012 /*
3013 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3014 */
3015 static int cmd_register_consumer(struct ltt_session *session, int domain,
3016 char *sock_path)
3017 {
3018 int ret, sock;
3019
3020 switch (domain) {
3021 case LTTNG_DOMAIN_KERNEL:
3022 /* Can't register a consumer if there is already one */
3023 if (session->kernel_session->consumer_fds_sent != 0) {
3024 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3025 goto error;
3026 }
3027
3028 sock = lttcomm_connect_unix_sock(sock_path);
3029 if (sock < 0) {
3030 ret = LTTCOMM_CONNECT_FAIL;
3031 goto error;
3032 }
3033
3034 session->kernel_session->consumer_fd = sock;
3035 break;
3036 default:
3037 /* TODO: Userspace tracing */
3038 ret = LTTCOMM_NOT_IMPLEMENTED;
3039 goto error;
3040 }
3041
3042 ret = LTTCOMM_OK;
3043
3044 error:
3045 return ret;
3046 }
3047
3048 /*
3049 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3050 */
3051 static ssize_t cmd_list_domains(struct ltt_session *session,
3052 struct lttng_domain **domains)
3053 {
3054 int ret, index = 0;
3055 ssize_t nb_dom = 0;
3056
3057 if (session->kernel_session != NULL) {
3058 DBG3("Listing domains found kernel domain");
3059 nb_dom++;
3060 }
3061
3062 if (session->ust_session != NULL) {
3063 DBG3("Listing domains found UST global domain");
3064 nb_dom++;
3065 }
3066
3067 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3068 if (*domains == NULL) {
3069 ret = -LTTCOMM_FATAL;
3070 goto error;
3071 }
3072
3073 if (session->kernel_session != NULL) {
3074 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3075 index++;
3076 }
3077
3078 if (session->ust_session != NULL) {
3079 (*domains)[index].type = LTTNG_DOMAIN_UST;
3080 index++;
3081 }
3082
3083 return nb_dom;
3084
3085 error:
3086 return ret;
3087 }
3088
3089 /*
3090 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3091 */
3092 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3093 struct lttng_channel **channels)
3094 {
3095 int ret;
3096 ssize_t nb_chan = 0;
3097
3098 switch (domain) {
3099 case LTTNG_DOMAIN_KERNEL:
3100 if (session->kernel_session != NULL) {
3101 nb_chan = session->kernel_session->channel_count;
3102 }
3103 DBG3("Number of kernel channels %zd", nb_chan);
3104 break;
3105 case LTTNG_DOMAIN_UST:
3106 if (session->ust_session != NULL) {
3107 nb_chan = hashtable_get_count(
3108 session->ust_session->domain_global.channels);
3109 }
3110 DBG3("Number of UST global channels %zd", nb_chan);
3111 break;
3112 default:
3113 *channels = NULL;
3114 ret = -LTTCOMM_NOT_IMPLEMENTED;
3115 goto error;
3116 }
3117
3118 if (nb_chan > 0) {
3119 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3120 if (*channels == NULL) {
3121 ret = -LTTCOMM_FATAL;
3122 goto error;
3123 }
3124
3125 list_lttng_channels(domain, session, *channels);
3126 } else {
3127 *channels = NULL;
3128 }
3129
3130 return nb_chan;
3131
3132 error:
3133 return ret;
3134 }
3135
3136 /*
3137 * Command LTTNG_LIST_EVENTS processed by the client thread.
3138 */
3139 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3140 char *channel_name, struct lttng_event **events)
3141 {
3142 int ret = 0;
3143 ssize_t nb_event = 0;
3144
3145 switch (domain) {
3146 case LTTNG_DOMAIN_KERNEL:
3147 if (session->kernel_session != NULL) {
3148 nb_event = list_lttng_kernel_events(channel_name,
3149 session->kernel_session, events);
3150 }
3151 break;
3152 case LTTNG_DOMAIN_UST:
3153 {
3154 if (session->ust_session != NULL) {
3155 nb_event = list_lttng_ust_global_events(channel_name,
3156 &session->ust_session->domain_global, events);
3157 }
3158 break;
3159 }
3160 default:
3161 ret = -LTTCOMM_NOT_IMPLEMENTED;
3162 goto error;
3163 }
3164
3165 ret = nb_event;
3166
3167 error:
3168 return ret;
3169 }
3170
3171 /*
3172 * Process the command requested by the lttng client within the command
3173 * context structure. This function make sure that the return structure (llm)
3174 * is set and ready for transmission before returning.
3175 *
3176 * Return any error encountered or 0 for success.
3177 */
3178 static int process_client_msg(struct command_ctx *cmd_ctx)
3179 {
3180 int ret = LTTCOMM_OK;
3181 int need_tracing_session = 1;
3182
3183 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3184
3185 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3186 ret = LTTCOMM_KERN_NA;
3187 goto error;
3188 }
3189
3190 /*
3191 * Check for command that don't needs to allocate a returned payload. We do
3192 * this here so we don't have to make the call for no payload at each
3193 * command.
3194 */
3195 switch(cmd_ctx->lsm->cmd_type) {
3196 case LTTNG_LIST_SESSIONS:
3197 case LTTNG_LIST_TRACEPOINTS:
3198 case LTTNG_LIST_DOMAINS:
3199 case LTTNG_LIST_CHANNELS:
3200 case LTTNG_LIST_EVENTS:
3201 break;
3202 default:
3203 /* Setup lttng message with no payload */
3204 ret = setup_lttng_msg(cmd_ctx, 0);
3205 if (ret < 0) {
3206 /* This label does not try to unlock the session */
3207 goto init_setup_error;
3208 }
3209 }
3210
3211 /* Commands that DO NOT need a session. */
3212 switch (cmd_ctx->lsm->cmd_type) {
3213 case LTTNG_CALIBRATE:
3214 case LTTNG_CREATE_SESSION:
3215 case LTTNG_LIST_SESSIONS:
3216 case LTTNG_LIST_TRACEPOINTS:
3217 need_tracing_session = 0;
3218 break;
3219 default:
3220 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3221 session_lock_list();
3222 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3223 session_unlock_list();
3224 if (cmd_ctx->session == NULL) {
3225 if (cmd_ctx->lsm->session.name != NULL) {
3226 ret = LTTCOMM_SESS_NOT_FOUND;
3227 } else {
3228 /* If no session name specified */
3229 ret = LTTCOMM_SELECT_SESS;
3230 }
3231 goto error;
3232 } else {
3233 /* Acquire lock for the session */
3234 session_lock(cmd_ctx->session);
3235 }
3236 break;
3237 }
3238
3239 /*
3240 * Check domain type for specific "pre-action".
3241 */
3242 switch (cmd_ctx->lsm->domain.type) {
3243 case LTTNG_DOMAIN_KERNEL:
3244 /* Kernel tracer check */
3245 if (kernel_tracer_fd == 0) {
3246 /* Basically, load kernel tracer modules */
3247 init_kernel_tracer();
3248 if (kernel_tracer_fd == 0) {
3249 ret = LTTCOMM_KERN_NA;
3250 goto error;
3251 }
3252 }
3253
3254 /* Need a session for kernel command */
3255 if (need_tracing_session) {
3256 if (cmd_ctx->session->kernel_session == NULL) {
3257 ret = create_kernel_session(cmd_ctx->session, &cmd_ctx->creds);
3258 if (ret < 0) {
3259 ret = LTTCOMM_KERN_SESS_FAIL;
3260 goto error;
3261 }
3262 }
3263
3264 /* Start the kernel consumer daemon */
3265 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3266 if (kconsumer_data.pid == 0 &&
3267 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3268 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3269 ret = start_consumerd(&kconsumer_data);
3270 if (ret < 0) {
3271 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3272 goto error;
3273 }
3274 } else {
3275 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3276 }
3277 }
3278 break;
3279 case LTTNG_DOMAIN_UST:
3280 {
3281 if (need_tracing_session) {
3282 if (cmd_ctx->session->ust_session == NULL) {
3283 ret = create_ust_session(cmd_ctx->session,
3284 &cmd_ctx->lsm->domain, &cmd_ctx->creds);
3285 if (ret != LTTCOMM_OK) {
3286 goto error;
3287 }
3288 }
3289 /* Start the UST consumer daemons */
3290 /* 64-bit */
3291 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3292 if (consumerd64_bin[0] != '\0' &&
3293 ustconsumer64_data.pid == 0 &&
3294 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3295 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3296 ret = start_consumerd(&ustconsumer64_data);
3297 if (ret < 0) {
3298 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3299 ust_consumerd64_fd = -EINVAL;
3300 goto error;
3301 }
3302
3303 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3304 } else {
3305 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3306 }
3307 /* 32-bit */
3308 if (consumerd32_bin[0] != '\0' &&
3309 ustconsumer32_data.pid == 0 &&
3310 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3311 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3312 ret = start_consumerd(&ustconsumer32_data);
3313 if (ret < 0) {
3314 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3315 ust_consumerd32_fd = -EINVAL;
3316 goto error;
3317 }
3318 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3319 } else {
3320 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3321 }
3322 }
3323 break;
3324 }
3325 default:
3326 break;
3327 }
3328
3329 /* Process by command type */
3330 switch (cmd_ctx->lsm->cmd_type) {
3331 case LTTNG_ADD_CONTEXT:
3332 {
3333 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3334 cmd_ctx->lsm->u.context.channel_name,
3335 cmd_ctx->lsm->u.context.event_name,
3336 &cmd_ctx->lsm->u.context.ctx);
3337 break;
3338 }
3339 case LTTNG_DISABLE_CHANNEL:
3340 {
3341 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3342 cmd_ctx->lsm->u.disable.channel_name);
3343 break;
3344 }
3345 case LTTNG_DISABLE_EVENT:
3346 {
3347 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3348 cmd_ctx->lsm->u.disable.channel_name,
3349 cmd_ctx->lsm->u.disable.name);
3350 ret = LTTCOMM_OK;
3351 break;
3352 }
3353 case LTTNG_DISABLE_ALL_EVENT:
3354 {
3355 DBG("Disabling all events");
3356
3357 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3358 cmd_ctx->lsm->u.disable.channel_name);
3359 break;
3360 }
3361 case LTTNG_ENABLE_CHANNEL:
3362 {
3363 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3364 &cmd_ctx->lsm->u.channel.chan);
3365 break;
3366 }
3367 case LTTNG_ENABLE_EVENT:
3368 {
3369 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3370 cmd_ctx->lsm->u.enable.channel_name,
3371 &cmd_ctx->lsm->u.enable.event);
3372 break;
3373 }
3374 case LTTNG_ENABLE_ALL_EVENT:
3375 {
3376 DBG("Enabling all events");
3377
3378 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3379 cmd_ctx->lsm->u.enable.channel_name,
3380 cmd_ctx->lsm->u.enable.event.type);
3381 break;
3382 }
3383 case LTTNG_LIST_TRACEPOINTS:
3384 {
3385 struct lttng_event *events;
3386 ssize_t nb_events;
3387
3388 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3389 if (nb_events < 0) {
3390 ret = -nb_events;
3391 goto error;
3392 }
3393
3394 /*
3395 * Setup lttng message with payload size set to the event list size in
3396 * bytes and then copy list into the llm payload.
3397 */
3398 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3399 if (ret < 0) {
3400 free(events);
3401 goto setup_error;
3402 }
3403
3404 /* Copy event list into message payload */
3405 memcpy(cmd_ctx->llm->payload, events,
3406 sizeof(struct lttng_event) * nb_events);
3407
3408 free(events);
3409
3410 ret = LTTCOMM_OK;
3411 break;
3412 }
3413 case LTTNG_START_TRACE:
3414 {
3415 ret = cmd_start_trace(cmd_ctx->session);
3416 break;
3417 }
3418 case LTTNG_STOP_TRACE:
3419 {
3420 ret = cmd_stop_trace(cmd_ctx->session);
3421 break;
3422 }
3423 case LTTNG_CREATE_SESSION:
3424 {
3425 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3426 cmd_ctx->lsm->session.path);
3427 break;
3428 }
3429 case LTTNG_DESTROY_SESSION:
3430 {
3431 ret = cmd_destroy_session(cmd_ctx->session,
3432 cmd_ctx->lsm->session.name);
3433 break;
3434 }
3435 case LTTNG_LIST_DOMAINS:
3436 {
3437 ssize_t nb_dom;
3438 struct lttng_domain *domains;
3439
3440 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3441 if (nb_dom < 0) {
3442 ret = -nb_dom;
3443 goto error;
3444 }
3445
3446 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3447 if (ret < 0) {
3448 goto setup_error;
3449 }
3450
3451 /* Copy event list into message payload */
3452 memcpy(cmd_ctx->llm->payload, domains,
3453 nb_dom * sizeof(struct lttng_domain));
3454
3455 free(domains);
3456
3457 ret = LTTCOMM_OK;
3458 break;
3459 }
3460 case LTTNG_LIST_CHANNELS:
3461 {
3462 size_t nb_chan;
3463 struct lttng_channel *channels;
3464
3465 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3466 cmd_ctx->session, &channels);
3467 if (nb_chan < 0) {
3468 ret = -nb_chan;
3469 goto error;
3470 }
3471
3472 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3473 if (ret < 0) {
3474 goto setup_error;
3475 }
3476
3477 /* Copy event list into message payload */
3478 memcpy(cmd_ctx->llm->payload, channels,
3479 nb_chan * sizeof(struct lttng_channel));
3480
3481 free(channels);
3482
3483 ret = LTTCOMM_OK;
3484 break;
3485 }
3486 case LTTNG_LIST_EVENTS:
3487 {
3488 ssize_t nb_event;
3489 struct lttng_event *events = NULL;
3490
3491 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3492 cmd_ctx->lsm->u.list.channel_name, &events);
3493 if (nb_event < 0) {
3494 ret = -nb_event;
3495 goto error;
3496 }
3497
3498 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3499 if (ret < 0) {
3500 goto setup_error;
3501 }
3502
3503 /* Copy event list into message payload */
3504 memcpy(cmd_ctx->llm->payload, events,
3505 nb_event * sizeof(struct lttng_event));
3506
3507 free(events);
3508
3509 ret = LTTCOMM_OK;
3510 break;
3511 }
3512 case LTTNG_LIST_SESSIONS:
3513 {
3514 session_lock_list();
3515
3516 if (session_list_ptr->count == 0) {
3517 ret = LTTCOMM_NO_SESSION;
3518 session_unlock_list();
3519 goto error;
3520 }
3521
3522 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3523 session_list_ptr->count);
3524 if (ret < 0) {
3525 session_unlock_list();
3526 goto setup_error;
3527 }
3528
3529 /* Filled the session array */
3530 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3531
3532 session_unlock_list();
3533
3534 ret = LTTCOMM_OK;
3535 break;
3536 }
3537 case LTTNG_CALIBRATE:
3538 {
3539 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3540 &cmd_ctx->lsm->u.calibrate);
3541 break;
3542 }
3543 case LTTNG_REGISTER_CONSUMER:
3544 {
3545 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3546 cmd_ctx->lsm->u.reg.path);
3547 break;
3548 }
3549 default:
3550 ret = LTTCOMM_UND;
3551 break;
3552 }
3553
3554 error:
3555 if (cmd_ctx->llm == NULL) {
3556 DBG("Missing llm structure. Allocating one.");
3557 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3558 goto setup_error;
3559 }
3560 }
3561 /* Set return code */
3562 cmd_ctx->llm->ret_code = ret;
3563 setup_error:
3564 if (cmd_ctx->session) {
3565 session_unlock(cmd_ctx->session);
3566 }
3567 init_setup_error:
3568 return ret;
3569 }
3570
3571 /*
3572 * This thread manage all clients request using the unix client socket for
3573 * communication.
3574 */
3575 static void *thread_manage_clients(void *data)
3576 {
3577 int sock = 0, ret, i, pollfd;
3578 uint32_t revents, nb_fd;
3579 struct command_ctx *cmd_ctx = NULL;
3580 struct lttng_poll_event events;
3581
3582 DBG("[thread] Manage client started");
3583
3584 rcu_register_thread();
3585
3586 ret = lttcomm_listen_unix_sock(client_sock);
3587 if (ret < 0) {
3588 goto error;
3589 }
3590
3591 /*
3592 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3593 * more will be added to this poll set.
3594 */
3595 ret = create_thread_poll_set(&events, 2);
3596 if (ret < 0) {
3597 goto error;
3598 }
3599
3600 /* Add the application registration socket */
3601 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3602 if (ret < 0) {
3603 goto error;
3604 }
3605
3606 /*
3607 * Notify parent pid that we are ready to accept command for client side.
3608 */
3609 if (opt_sig_parent) {
3610 kill(ppid, SIGCHLD);
3611 }
3612
3613 while (1) {
3614 DBG("Accepting client command ...");
3615
3616 nb_fd = LTTNG_POLL_GETNB(&events);
3617
3618 /* Inifinite blocking call, waiting for transmission */
3619 ret = lttng_poll_wait(&events, -1);
3620 if (ret < 0) {
3621 goto error;
3622 }
3623
3624 for (i = 0; i < nb_fd; i++) {
3625 /* Fetch once the poll data */
3626 revents = LTTNG_POLL_GETEV(&events, i);
3627 pollfd = LTTNG_POLL_GETFD(&events, i);
3628
3629 /* Thread quit pipe has been closed. Killing thread. */
3630 ret = check_thread_quit_pipe(pollfd, revents);
3631 if (ret) {
3632 goto error;
3633 }
3634
3635 /* Event on the registration socket */
3636 if (pollfd == client_sock) {
3637 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3638 ERR("Client socket poll error");
3639 goto error;
3640 }
3641 }
3642 }
3643
3644 DBG("Wait for client response");
3645
3646 sock = lttcomm_accept_unix_sock(client_sock);
3647 if (sock < 0) {
3648 goto error;
3649 }
3650
3651 /* Set socket option for credentials retrieval */
3652 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3653 if (ret < 0) {
3654 goto error;
3655 }
3656
3657 /* Allocate context command to process the client request */
3658 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3659 if (cmd_ctx == NULL) {
3660 perror("zmalloc cmd_ctx");
3661 goto error;
3662 }
3663
3664 /* Allocate data buffer for reception */
3665 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3666 if (cmd_ctx->lsm == NULL) {
3667 perror("zmalloc cmd_ctx->lsm");
3668 goto error;
3669 }
3670
3671 cmd_ctx->llm = NULL;
3672 cmd_ctx->session = NULL;
3673
3674 /*
3675 * Data is received from the lttng client. The struct
3676 * lttcomm_session_msg (lsm) contains the command and data request of
3677 * the client.
3678 */
3679 DBG("Receiving data from client ...");
3680 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3681 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3682 if (ret <= 0) {
3683 DBG("Nothing recv() from client... continuing");
3684 close(sock);
3685 free(cmd_ctx);
3686 continue;
3687 }
3688
3689 // TODO: Validate cmd_ctx including sanity check for
3690 // security purpose.
3691
3692 rcu_thread_online();
3693 /*
3694 * This function dispatch the work to the kernel or userspace tracer
3695 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3696 * informations for the client. The command context struct contains
3697 * everything this function may needs.
3698 */
3699 ret = process_client_msg(cmd_ctx);
3700 rcu_thread_offline();
3701 if (ret < 0) {
3702 /*
3703 * TODO: Inform client somehow of the fatal error. At
3704 * this point, ret < 0 means that a zmalloc failed
3705 * (ENOMEM). Error detected but still accept command.
3706 */
3707 clean_command_ctx(&cmd_ctx);
3708 continue;
3709 }
3710
3711 DBG("Sending response (size: %d, retcode: %s)",
3712 cmd_ctx->lttng_msg_size,
3713 lttng_strerror(-cmd_ctx->llm->ret_code));
3714 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3715 if (ret < 0) {
3716 ERR("Failed to send data back to client");
3717 }
3718
3719 /* End of transmission */
3720 close(sock);
3721
3722 clean_command_ctx(&cmd_ctx);
3723 }
3724
3725 error:
3726 DBG("Client thread dying");
3727 unlink(client_unix_sock_path);
3728 close(client_sock);
3729 close(sock);
3730
3731 lttng_poll_clean(&events);
3732 clean_command_ctx(&cmd_ctx);
3733
3734 rcu_unregister_thread();
3735 return NULL;
3736 }
3737
3738
3739 /*
3740 * usage function on stderr
3741 */
3742 static void usage(void)
3743 {
3744 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3745 fprintf(stderr, " -h, --help Display this usage.\n");
3746 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3747 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3748 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3749 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3750 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3751 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3752 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3753 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3754 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3755 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3756 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3757 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3758 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3759 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3760 fprintf(stderr, " -V, --version Show version number.\n");
3761 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3762 fprintf(stderr, " -q, --quiet No output at all.\n");
3763 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3764 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3765 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3766 }
3767
3768 /*
3769 * daemon argument parsing
3770 */
3771 static int parse_args(int argc, char **argv)
3772 {
3773 int c;
3774
3775 static struct option long_options[] = {
3776 { "client-sock", 1, 0, 'c' },
3777 { "apps-sock", 1, 0, 'a' },
3778 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3779 { "kconsumerd-err-sock", 1, 0, 'E' },
3780 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3781 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3782 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3783 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3784 { "consumerd32-path", 1, 0, 'u' },
3785 { "consumerd32-libdir", 1, 0, 'U' },
3786 { "consumerd64-path", 1, 0, 't' },
3787 { "consumerd64-libdir", 1, 0, 'T' },
3788 { "daemonize", 0, 0, 'd' },
3789 { "sig-parent", 0, 0, 'S' },
3790 { "help", 0, 0, 'h' },
3791 { "group", 1, 0, 'g' },
3792 { "version", 0, 0, 'V' },
3793 { "quiet", 0, 0, 'q' },
3794 { "verbose", 0, 0, 'v' },
3795 { "verbose-consumer", 0, 0, 'Z' },
3796 { "no-kernel", 0, 0, 'N' },
3797 { NULL, 0, 0, 0 }
3798 };
3799
3800 while (1) {
3801 int option_index = 0;
3802 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3803 long_options, &option_index);
3804 if (c == -1) {
3805 break;
3806 }
3807
3808 switch (c) {
3809 case 0:
3810 fprintf(stderr, "option %s", long_options[option_index].name);
3811 if (optarg) {
3812 fprintf(stderr, " with arg %s\n", optarg);
3813 }
3814 break;
3815 case 'c':
3816 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3817 break;
3818 case 'a':
3819 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3820 break;
3821 case 'd':
3822 opt_daemon = 1;
3823 break;
3824 case 'g':
3825 opt_tracing_group = optarg;
3826 break;
3827 case 'h':
3828 usage();
3829 exit(EXIT_FAILURE);
3830 case 'V':
3831 fprintf(stdout, "%s\n", VERSION);
3832 exit(EXIT_SUCCESS);
3833 case 'S':
3834 opt_sig_parent = 1;
3835 break;
3836 case 'E':
3837 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3838 break;
3839 case 'C':
3840 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3841 break;
3842 case 'F':
3843 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3844 break;
3845 case 'D':
3846 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3847 break;
3848 case 'H':
3849 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3850 break;
3851 case 'G':
3852 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3853 break;
3854 case 'N':
3855 opt_no_kernel = 1;
3856 break;
3857 case 'q':
3858 opt_quiet = 1;
3859 break;
3860 case 'v':
3861 /* Verbose level can increase using multiple -v */
3862 opt_verbose += 1;
3863 break;
3864 case 'Z':
3865 opt_verbose_consumer += 1;
3866 break;
3867 case 'u':
3868 consumerd32_bin= optarg;
3869 break;
3870 case 'U':
3871 consumerd32_libdir = optarg;
3872 break;
3873 case 't':
3874 consumerd64_bin = optarg;
3875 break;
3876 case 'T':
3877 consumerd64_libdir = optarg;
3878 break;
3879 default:
3880 /* Unknown option or other error.
3881 * Error is printed by getopt, just return */
3882 return -1;
3883 }
3884 }
3885
3886 return 0;
3887 }
3888
3889 /*
3890 * Creates the two needed socket by the daemon.
3891 * apps_sock - The communication socket for all UST apps.
3892 * client_sock - The communication of the cli tool (lttng).
3893 */
3894 static int init_daemon_socket(void)
3895 {
3896 int ret = 0;
3897 mode_t old_umask;
3898
3899 old_umask = umask(0);
3900
3901 /* Create client tool unix socket */
3902 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3903 if (client_sock < 0) {
3904 ERR("Create unix sock failed: %s", client_unix_sock_path);
3905 ret = -1;
3906 goto end;
3907 }
3908
3909 /* File permission MUST be 660 */
3910 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3911 if (ret < 0) {
3912 ERR("Set file permissions failed: %s", client_unix_sock_path);
3913 perror("chmod");
3914 goto end;
3915 }
3916
3917 /* Create the application unix socket */
3918 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3919 if (apps_sock < 0) {
3920 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3921 ret = -1;
3922 goto end;
3923 }
3924
3925 /* File permission MUST be 666 */
3926 ret = chmod(apps_unix_sock_path,
3927 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3928 if (ret < 0) {
3929 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3930 perror("chmod");
3931 goto end;
3932 }
3933
3934 end:
3935 umask(old_umask);
3936 return ret;
3937 }
3938
3939 /*
3940 * Check if the global socket is available, and if a daemon is answering at the
3941 * other side. If yes, error is returned.
3942 */
3943 static int check_existing_daemon(void)
3944 {
3945 if (access(client_unix_sock_path, F_OK) < 0 &&
3946 access(apps_unix_sock_path, F_OK) < 0) {
3947 return 0;
3948 }
3949
3950 /* Is there anybody out there ? */
3951 if (lttng_session_daemon_alive()) {
3952 return -EEXIST;
3953 } else {
3954 return 0;
3955 }
3956 }
3957
3958 /*
3959 * Set the tracing group gid onto the client socket.
3960 *
3961 * Race window between mkdir and chown is OK because we are going from more
3962 * permissive (root.root) to les permissive (root.tracing).
3963 */
3964 static int set_permissions(char *rundir)
3965 {
3966 int ret;
3967 gid_t gid;
3968
3969 gid = allowed_group();
3970 if (gid < 0) {
3971 WARN("No tracing group detected");
3972 ret = 0;
3973 goto end;
3974 }
3975
3976 /* Set lttng run dir */
3977 ret = chown(rundir, 0, gid);
3978 if (ret < 0) {
3979 ERR("Unable to set group on %s", rundir);
3980 perror("chown");
3981 }
3982
3983 /* lttng client socket path */
3984 ret = chown(client_unix_sock_path, 0, gid);
3985 if (ret < 0) {
3986 ERR("Unable to set group on %s", client_unix_sock_path);
3987 perror("chown");
3988 }
3989
3990 /* kconsumer error socket path */
3991 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3992 if (ret < 0) {
3993 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3994 perror("chown");
3995 }
3996
3997 /* 64-bit ustconsumer error socket path */
3998 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3999 if (ret < 0) {
4000 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4001 perror("chown");
4002 }
4003
4004 /* 32-bit ustconsumer compat32 error socket path */
4005 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4006 if (ret < 0) {
4007 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4008 perror("chown");
4009 }
4010
4011 DBG("All permissions are set");
4012
4013 end:
4014 return ret;
4015 }
4016
4017 /*
4018 * Create the pipe used to wake up the kernel thread.
4019 */
4020 static int create_kernel_poll_pipe(void)
4021 {
4022 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4023 }
4024
4025 /*
4026 * Create the application command pipe to wake thread_manage_apps.
4027 */
4028 static int create_apps_cmd_pipe(void)
4029 {
4030 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4031 }
4032
4033 /*
4034 * Create the lttng run directory needed for all global sockets and pipe.
4035 */
4036 static int create_lttng_rundir(const char *rundir)
4037 {
4038 int ret;
4039
4040 DBG3("Creating LTTng run directory: %s", rundir);
4041
4042 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4043 if (ret < 0) {
4044 if (errno != EEXIST) {
4045 ERR("Unable to create %s", rundir);
4046 goto error;
4047 } else {
4048 ret = 0;
4049 }
4050 }
4051
4052 error:
4053 return ret;
4054 }
4055
4056 /*
4057 * Setup sockets and directory needed by the kconsumerd communication with the
4058 * session daemon.
4059 */
4060 static int set_consumer_sockets(struct consumer_data *consumer_data,
4061 const char *rundir)
4062 {
4063 int ret;
4064 char path[PATH_MAX];
4065
4066 switch (consumer_data->type) {
4067 case LTTNG_CONSUMER_KERNEL:
4068 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4069 break;
4070 case LTTNG_CONSUMER64_UST:
4071 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4072 break;
4073 case LTTNG_CONSUMER32_UST:
4074 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4075 break;
4076 default:
4077 ERR("Consumer type unknown");
4078 ret = -EINVAL;
4079 goto error;
4080 }
4081
4082 DBG2("Creating consumer directory: %s", path);
4083
4084 ret = mkdir(path, S_IRWXU | S_IRWXG);
4085 if (ret < 0) {
4086 if (errno != EEXIST) {
4087 ERR("Failed to create %s", path);
4088 goto error;
4089 }
4090 ret = 0;
4091 }
4092
4093 /* Create the kconsumerd error unix socket */
4094 consumer_data->err_sock =
4095 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4096 if (consumer_data->err_sock < 0) {
4097 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4098 ret = -1;
4099 goto error;
4100 }
4101
4102 /* File permission MUST be 660 */
4103 ret = chmod(consumer_data->err_unix_sock_path,
4104 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4105 if (ret < 0) {
4106 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4107 PERROR("chmod");
4108 goto error;
4109 }
4110
4111 error:
4112 return ret;
4113 }
4114
4115 /*
4116 * Signal handler for the daemon
4117 *
4118 * Simply stop all worker threads, leaving main() return gracefully after
4119 * joining all threads and calling cleanup().
4120 */
4121 static void sighandler(int sig)
4122 {
4123 switch (sig) {
4124 case SIGPIPE:
4125 DBG("SIGPIPE catched");
4126 return;
4127 case SIGINT:
4128 DBG("SIGINT catched");
4129 stop_threads();
4130 break;
4131 case SIGTERM:
4132 DBG("SIGTERM catched");
4133 stop_threads();
4134 break;
4135 default:
4136 break;
4137 }
4138 }
4139
4140 /*
4141 * Setup signal handler for :
4142 * SIGINT, SIGTERM, SIGPIPE
4143 */
4144 static int set_signal_handler(void)
4145 {
4146 int ret = 0;
4147 struct sigaction sa;
4148 sigset_t sigset;
4149
4150 if ((ret = sigemptyset(&sigset)) < 0) {
4151 perror("sigemptyset");
4152 return ret;
4153 }
4154
4155 sa.sa_handler = sighandler;
4156 sa.sa_mask = sigset;
4157 sa.sa_flags = 0;
4158 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4159 perror("sigaction");
4160 return ret;
4161 }
4162
4163 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4164 perror("sigaction");
4165 return ret;
4166 }
4167
4168 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4169 perror("sigaction");
4170 return ret;
4171 }
4172
4173 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4174
4175 return ret;
4176 }
4177
4178 /*
4179 * Set open files limit to unlimited. This daemon can open a large number of
4180 * file descriptors in order to consumer multiple kernel traces.
4181 */
4182 static void set_ulimit(void)
4183 {
4184 int ret;
4185 struct rlimit lim;
4186
4187 /* The kernel does not allowed an infinite limit for open files */
4188 lim.rlim_cur = 65535;
4189 lim.rlim_max = 65535;
4190
4191 ret = setrlimit(RLIMIT_NOFILE, &lim);
4192 if (ret < 0) {
4193 perror("failed to set open files limit");
4194 }
4195 }
4196
4197 /*
4198 * main
4199 */
4200 int main(int argc, char **argv)
4201 {
4202 int ret = 0;
4203 void *status;
4204 const char *home_path;
4205
4206 rcu_register_thread();
4207
4208 /* Create thread quit pipe */
4209 if ((ret = init_thread_quit_pipe()) < 0) {
4210 goto error;
4211 }
4212
4213 setup_consumerd_path();
4214
4215 /* Parse arguments */
4216 progname = argv[0];
4217 if ((ret = parse_args(argc, argv) < 0)) {
4218 goto error;
4219 }
4220
4221 /* Daemonize */
4222 if (opt_daemon) {
4223 ret = daemon(0, 0);
4224 if (ret < 0) {
4225 perror("daemon");
4226 goto error;
4227 }
4228 }
4229
4230 /* Check if daemon is UID = 0 */
4231 is_root = !getuid();
4232
4233 if (is_root) {
4234 rundir = strdup(LTTNG_RUNDIR);
4235
4236 /* Create global run dir with root access */
4237 ret = create_lttng_rundir(rundir);
4238 if (ret < 0) {
4239 goto error;
4240 }
4241
4242 if (strlen(apps_unix_sock_path) == 0) {
4243 snprintf(apps_unix_sock_path, PATH_MAX,
4244 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4245 }
4246
4247 if (strlen(client_unix_sock_path) == 0) {
4248 snprintf(client_unix_sock_path, PATH_MAX,
4249 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4250 }
4251
4252 /* Set global SHM for ust */
4253 if (strlen(wait_shm_path) == 0) {
4254 snprintf(wait_shm_path, PATH_MAX,
4255 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4256 }
4257
4258 /* Setup kernel consumerd path */
4259 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4260 KCONSUMERD_ERR_SOCK_PATH, rundir);
4261 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4262 KCONSUMERD_CMD_SOCK_PATH, rundir);
4263
4264 DBG2("Kernel consumer err path: %s",
4265 kconsumer_data.err_unix_sock_path);
4266 DBG2("Kernel consumer cmd path: %s",
4267 kconsumer_data.cmd_unix_sock_path);
4268 } else {
4269 home_path = get_home_dir();
4270 if (home_path == NULL) {
4271 /* TODO: Add --socket PATH option */
4272 ERR("Can't get HOME directory for sockets creation.");
4273 ret = -EPERM;
4274 goto error;
4275 }
4276
4277 /*
4278 * Create rundir from home path. This will create something like
4279 * $HOME/.lttng
4280 */
4281 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4282 if (ret < 0) {
4283 ret = -ENOMEM;
4284 goto error;
4285 }
4286
4287 ret = create_lttng_rundir(rundir);
4288 if (ret < 0) {
4289 goto error;
4290 }
4291
4292 if (strlen(apps_unix_sock_path) == 0) {
4293 snprintf(apps_unix_sock_path, PATH_MAX,
4294 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4295 }
4296
4297 /* Set the cli tool unix socket path */
4298 if (strlen(client_unix_sock_path) == 0) {
4299 snprintf(client_unix_sock_path, PATH_MAX,
4300 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4301 }
4302
4303 /* Set global SHM for ust */
4304 if (strlen(wait_shm_path) == 0) {
4305 snprintf(wait_shm_path, PATH_MAX,
4306 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4307 }
4308 }
4309
4310 DBG("Client socket path %s", client_unix_sock_path);
4311 DBG("Application socket path %s", apps_unix_sock_path);
4312 DBG("LTTng run directory path: %s", rundir);
4313
4314 /* 32 bits consumerd path setup */
4315 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4316 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4317 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4318 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4319
4320 DBG2("UST consumer 32 bits err path: %s",
4321 ustconsumer32_data.err_unix_sock_path);
4322 DBG2("UST consumer 32 bits cmd path: %s",
4323 ustconsumer32_data.cmd_unix_sock_path);
4324
4325 /* 64 bits consumerd path setup */
4326 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4327 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4328 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4329 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4330
4331 DBG2("UST consumer 64 bits err path: %s",
4332 ustconsumer64_data.err_unix_sock_path);
4333 DBG2("UST consumer 64 bits cmd path: %s",
4334 ustconsumer64_data.cmd_unix_sock_path);
4335
4336 /*
4337 * See if daemon already exist.
4338 */
4339 if ((ret = check_existing_daemon()) < 0) {
4340 ERR("Already running daemon.\n");
4341 /*
4342 * We do not goto exit because we must not cleanup()
4343 * because a daemon is already running.
4344 */
4345 goto error;
4346 }
4347
4348 /* After this point, we can safely call cleanup() with "goto exit" */
4349
4350 /*
4351 * These actions must be executed as root. We do that *after* setting up
4352 * the sockets path because we MUST make the check for another daemon using
4353 * those paths *before* trying to set the kernel consumer sockets and init
4354 * kernel tracer.
4355 */
4356 if (is_root) {
4357 ret = set_consumer_sockets(&kconsumer_data, rundir);
4358 if (ret < 0) {
4359 goto exit;
4360 }
4361
4362 /* Setup kernel tracer */
4363 if (!opt_no_kernel) {
4364 init_kernel_tracer();
4365 }
4366
4367 /* Set ulimit for open files */
4368 set_ulimit();
4369 }
4370
4371 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4372 if (ret < 0) {
4373 goto exit;
4374 }
4375
4376 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4377 if (ret < 0) {
4378 goto exit;
4379 }
4380
4381 if ((ret = set_signal_handler()) < 0) {
4382 goto exit;
4383 }
4384
4385 /* Setup the needed unix socket */
4386 if ((ret = init_daemon_socket()) < 0) {
4387 goto exit;
4388 }
4389
4390 /* Set credentials to socket */
4391 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4392 goto exit;
4393 }
4394
4395 /* Get parent pid if -S, --sig-parent is specified. */
4396 if (opt_sig_parent) {
4397 ppid = getppid();
4398 }
4399
4400 /* Setup the kernel pipe for waking up the kernel thread */
4401 if ((ret = create_kernel_poll_pipe()) < 0) {
4402 goto exit;
4403 }
4404
4405 /* Setup the thread apps communication pipe. */
4406 if ((ret = create_apps_cmd_pipe()) < 0) {
4407 goto exit;
4408 }
4409
4410 /* Init UST command queue. */
4411 cds_wfq_init(&ust_cmd_queue.queue);
4412
4413 /* Init UST app hash table */
4414 ust_app_ht_alloc();
4415
4416 /*
4417 * Get session list pointer. This pointer MUST NOT be free(). This list is
4418 * statically declared in session.c
4419 */
4420 session_list_ptr = session_get_list();
4421
4422 /* Set up max poll set size */
4423 lttng_poll_set_max_size();
4424
4425 /* Create thread to manage the client socket */
4426 ret = pthread_create(&client_thread, NULL,
4427 thread_manage_clients, (void *) NULL);
4428 if (ret != 0) {
4429 perror("pthread_create clients");
4430 goto exit_client;
4431 }
4432
4433 /* Create thread to dispatch registration */
4434 ret = pthread_create(&dispatch_thread, NULL,
4435 thread_dispatch_ust_registration, (void *) NULL);
4436 if (ret != 0) {
4437 perror("pthread_create dispatch");
4438 goto exit_dispatch;
4439 }
4440
4441 /* Create thread to manage application registration. */
4442 ret = pthread_create(&reg_apps_thread, NULL,
4443 thread_registration_apps, (void *) NULL);
4444 if (ret != 0) {
4445 perror("pthread_create registration");
4446 goto exit_reg_apps;
4447 }
4448
4449 /* Create thread to manage application socket */
4450 ret = pthread_create(&apps_thread, NULL,
4451 thread_manage_apps, (void *) NULL);
4452 if (ret != 0) {
4453 perror("pthread_create apps");
4454 goto exit_apps;
4455 }
4456
4457 /* Create kernel thread to manage kernel event */
4458 ret = pthread_create(&kernel_thread, NULL,
4459 thread_manage_kernel, (void *) NULL);
4460 if (ret != 0) {
4461 perror("pthread_create kernel");
4462 goto exit_kernel;
4463 }
4464
4465 ret = pthread_join(kernel_thread, &status);
4466 if (ret != 0) {
4467 perror("pthread_join");
4468 goto error; /* join error, exit without cleanup */
4469 }
4470
4471 exit_kernel:
4472 ret = pthread_join(apps_thread, &status);
4473 if (ret != 0) {
4474 perror("pthread_join");
4475 goto error; /* join error, exit without cleanup */
4476 }
4477
4478 exit_apps:
4479 ret = pthread_join(reg_apps_thread, &status);
4480 if (ret != 0) {
4481 perror("pthread_join");
4482 goto error; /* join error, exit without cleanup */
4483 }
4484
4485 exit_reg_apps:
4486 ret = pthread_join(dispatch_thread, &status);
4487 if (ret != 0) {
4488 perror("pthread_join");
4489 goto error; /* join error, exit without cleanup */
4490 }
4491
4492 exit_dispatch:
4493 ret = pthread_join(client_thread, &status);
4494 if (ret != 0) {
4495 perror("pthread_join");
4496 goto error; /* join error, exit without cleanup */
4497 }
4498
4499 ret = join_consumer_thread(&kconsumer_data);
4500 if (ret != 0) {
4501 perror("join_consumer");
4502 goto error; /* join error, exit without cleanup */
4503 }
4504
4505 exit_client:
4506 exit:
4507 /*
4508 * cleanup() is called when no other thread is running.
4509 */
4510 rcu_thread_online();
4511 cleanup();
4512 rcu_thread_offline();
4513 rcu_unregister_thread();
4514 if (!ret) {
4515 exit(EXIT_SUCCESS);
4516 }
4517 error:
4518 exit(EXIT_FAILURE);
4519 }
LTTng 2.0 tools and control repository
This page took 0.183418 seconds and 4 git commands to generate.