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Update loglevel ABI
[lttng-tools.git] / src / bin / 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 <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearing down session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearing down session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all sessions");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
425 }
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
429
430 /* <fun> */
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
435 }
436
437 /*
438 * Send data on a unix socket using the liblttsessiondcomm API.
439 *
440 * Return lttcomm error code.
441 */
442 static int send_unix_sock(int sock, void *buf, size_t len)
443 {
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450 }
451
452 /*
453 * Free memory of a command context structure.
454 */
455 static void clean_command_ctx(struct command_ctx **cmd_ctx)
456 {
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
461 }
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
464 }
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
467 }
468 }
469
470 /*
471 * Send all stream fds of kernel channel to the consumer.
472 */
473 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
476 {
477 int ret;
478 struct ltt_kernel_stream *stream;
479 struct lttcomm_consumer_msg lkm;
480
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel->channel->name);
483
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
491 if (ret < 0) {
492 perror("send consumer channel");
493 goto error;
494 }
495
496 /* Send streams */
497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
521 }
522 }
523
524 DBG("consumer channel streams sent");
525
526 return 0;
527
528 error:
529 return ret;
530 }
531
532 /*
533 * Send all stream fds of the kernel session to the consumer.
534 */
535 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
536 struct ltt_kernel_session *session)
537 {
538 int ret;
539 struct ltt_kernel_channel *chan;
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
542
543 DBG("Sending metadata stream fd");
544
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session->consumer_fd == 0) {
547 session->consumer_fd = consumer_data->cmd_sock;
548 }
549
550 if (session->metadata_stream_fd != 0) {
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
581 if (ret < 0) {
582 perror("send consumer stream");
583 goto error;
584 }
585 }
586
587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599 error:
600 return ret;
601 }
602
603 /*
604 * Notify UST applications using the shm mmap futex.
605 */
606 static int notify_ust_apps(int active)
607 {
608 char *wait_shm_mmap;
609
610 DBG("Notifying applications of session daemon state: %d", active);
611
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
615 goto error;
616 }
617
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
623
624 error:
625 return -1;
626 }
627
628 /*
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
632 *
633 * Return total size of the buffer pointed by buf.
634 */
635 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
636 {
637 int ret, buf_size;
638
639 buf_size = size;
640
641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
642 if (cmd_ctx->llm == NULL) {
643 perror("zmalloc");
644 ret = -ENOMEM;
645 goto error;
646 }
647
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
651
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
655 return buf_size;
656
657 error:
658 return ret;
659 }
660
661 /*
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
664 */
665 static int update_kernel_poll(struct lttng_poll_event *events)
666 {
667 int ret;
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
671 DBG("Updating kernel poll set");
672
673 session_lock_list();
674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
675 session_lock(session);
676 if (session->kernel_session == NULL) {
677 session_unlock(session);
678 continue;
679 }
680
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
686 session_unlock(session);
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
690 }
691 session_unlock(session);
692 }
693 session_unlock_list();
694
695 return 0;
696
697 error:
698 session_unlock_list();
699 return -1;
700 }
701
702 /*
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
705 *
706 * Useful for CPU hotplug feature.
707 */
708 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
709 {
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
716 session_lock_list();
717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
718 session_lock(session);
719 if (session->kernel_session == NULL) {
720 session_unlock(session);
721 continue;
722 }
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
735 goto error;
736 }
737
738 /*
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
742 */
743 if (session->kernel_session->consumer_fds_sent == 1) {
744 ret = send_kconsumer_channel_streams(consumer_data,
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
747 if (ret < 0) {
748 goto error;
749 }
750 }
751 goto error;
752 }
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757 return ret;
758
759 error:
760 session_unlock(session);
761 session_unlock_list();
762 return ret;
763 }
764
765 /*
766 * For each tracing session, update newly registered apps.
767 */
768 static void update_ust_app(int app_sock)
769 {
770 struct ltt_session *sess, *stmp;
771
772 /* For all tracing session(s) */
773 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
774 if (sess->ust_session) {
775 ust_app_global_update(sess->ust_session, app_sock);
776 }
777 }
778 }
779
780 /*
781 * This thread manage event coming from the kernel.
782 *
783 * Features supported in this thread:
784 * -) CPU Hotplug
785 */
786 static void *thread_manage_kernel(void *data)
787 {
788 int ret, i, pollfd, update_poll_flag = 1;
789 uint32_t revents, nb_fd;
790 char tmp;
791 struct lttng_poll_event events;
792
793 DBG("Thread manage kernel started");
794
795 ret = create_thread_poll_set(&events, 2);
796 if (ret < 0) {
797 goto error;
798 }
799
800 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
801 if (ret < 0) {
802 goto error;
803 }
804
805 while (1) {
806 if (update_poll_flag == 1) {
807 /*
808 * Reset number of fd in the poll set. Always 2 since there is the thread
809 * quit pipe and the kernel pipe.
810 */
811 events.nb_fd = 2;
812
813 ret = update_kernel_poll(&events);
814 if (ret < 0) {
815 goto error;
816 }
817 update_poll_flag = 0;
818 }
819
820 nb_fd = LTTNG_POLL_GETNB(&events);
821
822 DBG("Thread kernel polling on %d fds", nb_fd);
823
824 /* Zeroed the poll events */
825 lttng_poll_reset(&events);
826
827 /* Poll infinite value of time */
828 ret = lttng_poll_wait(&events, -1);
829 if (ret < 0) {
830 goto error;
831 } else if (ret == 0) {
832 /* Should not happen since timeout is infinite */
833 ERR("Return value of poll is 0 with an infinite timeout.\n"
834 "This should not have happened! Continuing...");
835 continue;
836 }
837
838 for (i = 0; i < nb_fd; i++) {
839 /* Fetch once the poll data */
840 revents = LTTNG_POLL_GETEV(&events, i);
841 pollfd = LTTNG_POLL_GETFD(&events, i);
842
843 /* Thread quit pipe has been closed. Killing thread. */
844 ret = check_thread_quit_pipe(pollfd, revents);
845 if (ret) {
846 goto error;
847 }
848
849 /* Check for data on kernel pipe */
850 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
851 ret = read(kernel_poll_pipe[0], &tmp, 1);
852 update_poll_flag = 1;
853 continue;
854 } else {
855 /*
856 * New CPU detected by the kernel. Adding kernel stream to
857 * kernel session and updating the kernel consumer
858 */
859 if (revents & LPOLLIN) {
860 ret = update_kernel_stream(&kconsumer_data, pollfd);
861 if (ret < 0) {
862 continue;
863 }
864 break;
865 /*
866 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
867 * and unregister kernel stream at this point.
868 */
869 }
870 }
871 }
872 }
873
874 error:
875 DBG("Kernel thread dying");
876 close(kernel_poll_pipe[0]);
877 close(kernel_poll_pipe[1]);
878
879 lttng_poll_clean(&events);
880
881 return NULL;
882 }
883
884 /*
885 * This thread manage the consumer error sent back to the session daemon.
886 */
887 static void *thread_manage_consumer(void *data)
888 {
889 int sock = 0, i, ret, pollfd;
890 uint32_t revents, nb_fd;
891 enum lttcomm_return_code code;
892 struct lttng_poll_event events;
893 struct consumer_data *consumer_data = data;
894
895 DBG("[thread] Manage consumer started");
896
897 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
898 if (ret < 0) {
899 goto error;
900 }
901
902 /*
903 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
904 * Nothing more will be added to this poll set.
905 */
906 ret = create_thread_poll_set(&events, 2);
907 if (ret < 0) {
908 goto error;
909 }
910
911 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
912 if (ret < 0) {
913 goto error;
914 }
915
916 nb_fd = LTTNG_POLL_GETNB(&events);
917
918 /* Inifinite blocking call, waiting for transmission */
919 ret = lttng_poll_wait(&events, -1);
920 if (ret < 0) {
921 goto error;
922 }
923
924 for (i = 0; i < nb_fd; i++) {
925 /* Fetch once the poll data */
926 revents = LTTNG_POLL_GETEV(&events, i);
927 pollfd = LTTNG_POLL_GETFD(&events, i);
928
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret = check_thread_quit_pipe(pollfd, revents);
931 if (ret) {
932 goto error;
933 }
934
935 /* Event on the registration socket */
936 if (pollfd == consumer_data->err_sock) {
937 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
938 ERR("consumer err socket poll error");
939 goto error;
940 }
941 }
942 }
943
944 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
945 if (sock < 0) {
946 goto error;
947 }
948
949 DBG2("Receiving code from consumer err_sock");
950
951 /* Getting status code from kconsumerd */
952 ret = lttcomm_recv_unix_sock(sock, &code,
953 sizeof(enum lttcomm_return_code));
954 if (ret <= 0) {
955 goto error;
956 }
957
958 if (code == CONSUMERD_COMMAND_SOCK_READY) {
959 consumer_data->cmd_sock =
960 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
961 if (consumer_data->cmd_sock < 0) {
962 sem_post(&consumer_data->sem);
963 PERROR("consumer connect");
964 goto error;
965 }
966 /* Signal condition to tell that the kconsumerd is ready */
967 sem_post(&consumer_data->sem);
968 DBG("consumer command socket ready");
969 } else {
970 ERR("consumer error when waiting for SOCK_READY : %s",
971 lttcomm_get_readable_code(-code));
972 goto error;
973 }
974
975 /* Remove the kconsumerd error sock since we've established a connexion */
976 ret = lttng_poll_del(&events, consumer_data->err_sock);
977 if (ret < 0) {
978 goto error;
979 }
980
981 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
982 if (ret < 0) {
983 goto error;
984 }
985
986 /* Update number of fd */
987 nb_fd = LTTNG_POLL_GETNB(&events);
988
989 /* Inifinite blocking call, waiting for transmission */
990 ret = lttng_poll_wait(&events, -1);
991 if (ret < 0) {
992 goto error;
993 }
994
995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the kconsumerd socket */
1007 if (pollfd == sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1009 ERR("consumer err socket second poll error");
1010 goto error;
1011 }
1012 }
1013 }
1014
1015 /* Wait for any kconsumerd error */
1016 ret = lttcomm_recv_unix_sock(sock, &code,
1017 sizeof(enum lttcomm_return_code));
1018 if (ret <= 0) {
1019 ERR("consumer closed the command socket");
1020 goto error;
1021 }
1022
1023 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1024
1025 error:
1026 DBG("consumer thread dying");
1027 close(consumer_data->err_sock);
1028 close(consumer_data->cmd_sock);
1029 close(sock);
1030
1031 unlink(consumer_data->err_unix_sock_path);
1032 unlink(consumer_data->cmd_unix_sock_path);
1033 consumer_data->pid = 0;
1034
1035 lttng_poll_clean(&events);
1036
1037 return NULL;
1038 }
1039
1040 /*
1041 * This thread manage application communication.
1042 */
1043 static void *thread_manage_apps(void *data)
1044 {
1045 int i, ret, pollfd;
1046 uint32_t revents, nb_fd;
1047 struct ust_command ust_cmd;
1048 struct lttng_poll_event events;
1049
1050 DBG("[thread] Manage application started");
1051
1052 rcu_register_thread();
1053 rcu_thread_online();
1054
1055 ret = create_thread_poll_set(&events, 2);
1056 if (ret < 0) {
1057 goto error;
1058 }
1059
1060 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1061 if (ret < 0) {
1062 goto error;
1063 }
1064
1065 while (1) {
1066 /* Zeroed the events structure */
1067 lttng_poll_reset(&events);
1068
1069 nb_fd = LTTNG_POLL_GETNB(&events);
1070
1071 DBG("Apps thread polling on %d fds", nb_fd);
1072
1073 /* Inifinite blocking call, waiting for transmission */
1074 ret = lttng_poll_wait(&events, -1);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078
1079 for (i = 0; i < nb_fd; i++) {
1080 /* Fetch once the poll data */
1081 revents = LTTNG_POLL_GETEV(&events, i);
1082 pollfd = LTTNG_POLL_GETFD(&events, i);
1083
1084 /* Thread quit pipe has been closed. Killing thread. */
1085 ret = check_thread_quit_pipe(pollfd, revents);
1086 if (ret) {
1087 goto error;
1088 }
1089
1090 /* Inspect the apps cmd pipe */
1091 if (pollfd == apps_cmd_pipe[0]) {
1092 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1093 ERR("Apps command pipe error");
1094 goto error;
1095 } else if (revents & LPOLLIN) {
1096 /* Empty pipe */
1097 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1098 if (ret < 0 || ret < sizeof(ust_cmd)) {
1099 perror("read apps cmd pipe");
1100 goto error;
1101 }
1102
1103 /* Register applicaton to the session daemon */
1104 ret = ust_app_register(&ust_cmd.reg_msg,
1105 ust_cmd.sock);
1106 if (ret == -ENOMEM) {
1107 goto error;
1108 } else if (ret < 0) {
1109 break;
1110 }
1111
1112 /*
1113 * Validate UST version compatibility.
1114 */
1115 ret = ust_app_validate_version(ust_cmd.sock);
1116 if (ret >= 0) {
1117 /*
1118 * Add channel(s) and event(s) to newly registered apps
1119 * from lttng global UST domain.
1120 */
1121 update_ust_app(ust_cmd.sock);
1122 }
1123
1124 ret = ust_app_register_done(ust_cmd.sock);
1125 if (ret < 0) {
1126 /*
1127 * If the registration is not possible, we simply
1128 * unregister the apps and continue
1129 */
1130 ust_app_unregister(ust_cmd.sock);
1131 } else {
1132 /*
1133 * We just need here to monitor the close of the UST
1134 * socket and poll set monitor those by default.
1135 */
1136 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
1141 DBG("Apps with sock %d added to poll set",
1142 ust_cmd.sock);
1143 }
1144
1145 break;
1146 }
1147 } else {
1148 /*
1149 * At this point, we know that a registered application made
1150 * the event at poll_wait.
1151 */
1152 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1153 /* Removing from the poll set */
1154 ret = lttng_poll_del(&events, pollfd);
1155 if (ret < 0) {
1156 goto error;
1157 }
1158
1159 /* Socket closed on remote end. */
1160 ust_app_unregister(pollfd);
1161 break;
1162 }
1163 }
1164 }
1165 }
1166
1167 error:
1168 DBG("Application communication apps dying");
1169 close(apps_cmd_pipe[0]);
1170 close(apps_cmd_pipe[1]);
1171
1172 lttng_poll_clean(&events);
1173
1174 rcu_thread_offline();
1175 rcu_unregister_thread();
1176 return NULL;
1177 }
1178
1179 /*
1180 * Dispatch request from the registration threads to the application
1181 * communication thread.
1182 */
1183 static void *thread_dispatch_ust_registration(void *data)
1184 {
1185 int ret;
1186 struct cds_wfq_node *node;
1187 struct ust_command *ust_cmd = NULL;
1188
1189 DBG("[thread] Dispatch UST command started");
1190
1191 while (!dispatch_thread_exit) {
1192 /* Atomically prepare the queue futex */
1193 futex_nto1_prepare(&ust_cmd_queue.futex);
1194
1195 do {
1196 /* Dequeue command for registration */
1197 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1198 if (node == NULL) {
1199 DBG("Woken up but nothing in the UST command queue");
1200 /* Continue thread execution */
1201 break;
1202 }
1203
1204 ust_cmd = caa_container_of(node, struct ust_command, node);
1205
1206 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1207 " gid:%d sock:%d name:%s (version %d.%d)",
1208 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1209 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1210 ust_cmd->sock, ust_cmd->reg_msg.name,
1211 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1212 /*
1213 * Inform apps thread of the new application registration. This
1214 * call is blocking so we can be assured that the data will be read
1215 * at some point in time or wait to the end of the world :)
1216 */
1217 ret = write(apps_cmd_pipe[1], ust_cmd,
1218 sizeof(struct ust_command));
1219 if (ret < 0) {
1220 perror("write apps cmd pipe");
1221 if (errno == EBADF) {
1222 /*
1223 * We can't inform the application thread to process
1224 * registration. We will exit or else application
1225 * registration will not occur and tracing will never
1226 * start.
1227 */
1228 goto error;
1229 }
1230 }
1231 free(ust_cmd);
1232 } while (node != NULL);
1233
1234 /* Futex wait on queue. Blocking call on futex() */
1235 futex_nto1_wait(&ust_cmd_queue.futex);
1236 }
1237
1238 error:
1239 DBG("Dispatch thread dying");
1240 return NULL;
1241 }
1242
1243 /*
1244 * This thread manage application registration.
1245 */
1246 static void *thread_registration_apps(void *data)
1247 {
1248 int sock = 0, i, ret, pollfd;
1249 uint32_t revents, nb_fd;
1250 struct lttng_poll_event events;
1251 /*
1252 * Get allocated in this thread, enqueued to a global queue, dequeued and
1253 * freed in the manage apps thread.
1254 */
1255 struct ust_command *ust_cmd = NULL;
1256
1257 DBG("[thread] Manage application registration started");
1258
1259 ret = lttcomm_listen_unix_sock(apps_sock);
1260 if (ret < 0) {
1261 goto error;
1262 }
1263
1264 /*
1265 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1266 * more will be added to this poll set.
1267 */
1268 ret = create_thread_poll_set(&events, 2);
1269 if (ret < 0) {
1270 goto error;
1271 }
1272
1273 /* Add the application registration socket */
1274 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
1279 /* Notify all applications to register */
1280 ret = notify_ust_apps(1);
1281 if (ret < 0) {
1282 ERR("Failed to notify applications or create the wait shared memory.\n"
1283 "Execution continues but there might be problem for already\n"
1284 "running applications that wishes to register.");
1285 }
1286
1287 while (1) {
1288 DBG("Accepting application registration");
1289
1290 nb_fd = LTTNG_POLL_GETNB(&events);
1291
1292 /* Inifinite blocking call, waiting for transmission */
1293 ret = lttng_poll_wait(&events, -1);
1294 if (ret < 0) {
1295 goto error;
1296 }
1297
1298 for (i = 0; i < nb_fd; i++) {
1299 /* Fetch once the poll data */
1300 revents = LTTNG_POLL_GETEV(&events, i);
1301 pollfd = LTTNG_POLL_GETFD(&events, i);
1302
1303 /* Thread quit pipe has been closed. Killing thread. */
1304 ret = check_thread_quit_pipe(pollfd, revents);
1305 if (ret) {
1306 goto error;
1307 }
1308
1309 /* Event on the registration socket */
1310 if (pollfd == apps_sock) {
1311 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1312 ERR("Register apps socket poll error");
1313 goto error;
1314 } else if (revents & LPOLLIN) {
1315 sock = lttcomm_accept_unix_sock(apps_sock);
1316 if (sock < 0) {
1317 goto error;
1318 }
1319
1320 /* Create UST registration command for enqueuing */
1321 ust_cmd = zmalloc(sizeof(struct ust_command));
1322 if (ust_cmd == NULL) {
1323 perror("ust command zmalloc");
1324 goto error;
1325 }
1326
1327 /*
1328 * Using message-based transmissions to ensure we don't
1329 * have to deal with partially received messages.
1330 */
1331 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1332 sizeof(struct ust_register_msg));
1333 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1334 if (ret < 0) {
1335 perror("lttcomm_recv_unix_sock register apps");
1336 } else {
1337 ERR("Wrong size received on apps register");
1338 }
1339 free(ust_cmd);
1340 close(sock);
1341 continue;
1342 }
1343
1344 ust_cmd->sock = sock;
1345
1346 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1347 " gid:%d sock:%d name:%s (version %d.%d)",
1348 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1349 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1350 ust_cmd->sock, ust_cmd->reg_msg.name,
1351 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1352
1353 /*
1354 * Lock free enqueue the registration request. The red pill
1355 * has been taken! This apps will be part of the *system*.
1356 */
1357 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1358
1359 /*
1360 * Wake the registration queue futex. Implicit memory
1361 * barrier with the exchange in cds_wfq_enqueue.
1362 */
1363 futex_nto1_wake(&ust_cmd_queue.futex);
1364 }
1365 }
1366 }
1367 }
1368
1369 error:
1370 DBG("UST Registration thread dying");
1371
1372 /* Notify that the registration thread is gone */
1373 notify_ust_apps(0);
1374
1375 close(apps_sock);
1376 close(sock);
1377 unlink(apps_unix_sock_path);
1378
1379 lttng_poll_clean(&events);
1380
1381 return NULL;
1382 }
1383
1384 /*
1385 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1386 * exec or it will fails.
1387 */
1388 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1389 {
1390 int ret;
1391 struct timespec timeout;
1392
1393 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1394 timeout.tv_nsec = 0;
1395
1396 /* Setup semaphore */
1397 ret = sem_init(&consumer_data->sem, 0, 0);
1398 if (ret < 0) {
1399 PERROR("sem_init consumer semaphore");
1400 goto error;
1401 }
1402
1403 ret = pthread_create(&consumer_data->thread, NULL,
1404 thread_manage_consumer, consumer_data);
1405 if (ret != 0) {
1406 PERROR("pthread_create consumer");
1407 ret = -1;
1408 goto error;
1409 }
1410
1411 /* Get time for sem_timedwait absolute timeout */
1412 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1413 if (ret < 0) {
1414 PERROR("clock_gettime spawn consumer");
1415 /* Infinite wait for the kconsumerd thread to be ready */
1416 ret = sem_wait(&consumer_data->sem);
1417 } else {
1418 /* Normal timeout if the gettime was successful */
1419 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1420 ret = sem_timedwait(&consumer_data->sem, &timeout);
1421 }
1422
1423 if (ret < 0) {
1424 if (errno == ETIMEDOUT) {
1425 /*
1426 * Call has timed out so we kill the kconsumerd_thread and return
1427 * an error.
1428 */
1429 ERR("The consumer thread was never ready. Killing it");
1430 ret = pthread_cancel(consumer_data->thread);
1431 if (ret < 0) {
1432 PERROR("pthread_cancel consumer thread");
1433 }
1434 } else {
1435 PERROR("semaphore wait failed consumer thread");
1436 }
1437 goto error;
1438 }
1439
1440 pthread_mutex_lock(&consumer_data->pid_mutex);
1441 if (consumer_data->pid == 0) {
1442 ERR("Kconsumerd did not start");
1443 pthread_mutex_unlock(&consumer_data->pid_mutex);
1444 goto error;
1445 }
1446 pthread_mutex_unlock(&consumer_data->pid_mutex);
1447
1448 return 0;
1449
1450 error:
1451 return ret;
1452 }
1453
1454 /*
1455 * Join consumer thread
1456 */
1457 static int join_consumer_thread(struct consumer_data *consumer_data)
1458 {
1459 void *status;
1460 int ret;
1461
1462 if (consumer_data->pid != 0) {
1463 ret = kill(consumer_data->pid, SIGTERM);
1464 if (ret) {
1465 ERR("Error killing consumer daemon");
1466 return ret;
1467 }
1468 return pthread_join(consumer_data->thread, &status);
1469 } else {
1470 return 0;
1471 }
1472 }
1473
1474 /*
1475 * Fork and exec a consumer daemon (consumerd).
1476 *
1477 * Return pid if successful else -1.
1478 */
1479 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1480 {
1481 int ret;
1482 pid_t pid;
1483 const char *consumer_to_use;
1484 const char *verbosity;
1485 struct stat st;
1486
1487 DBG("Spawning consumerd");
1488
1489 pid = fork();
1490 if (pid == 0) {
1491 /*
1492 * Exec consumerd.
1493 */
1494 if (opt_verbose_consumer) {
1495 verbosity = "--verbose";
1496 } else {
1497 verbosity = "--quiet";
1498 }
1499 switch (consumer_data->type) {
1500 case LTTNG_CONSUMER_KERNEL:
1501 /*
1502 * Find out which consumerd to execute. We will first try the
1503 * 64-bit path, then the sessiond's installation directory, and
1504 * fallback on the 32-bit one,
1505 */
1506 DBG3("Looking for a kernel consumer at these locations:");
1507 DBG3(" 1) %s", consumerd64_bin);
1508 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1509 DBG3(" 3) %s", consumerd32_bin);
1510 if (stat(consumerd64_bin, &st) == 0) {
1511 DBG3("Found location #1");
1512 consumer_to_use = consumerd64_bin;
1513 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1514 DBG3("Found location #2");
1515 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1516 } else if (stat(consumerd32_bin, &st) == 0) {
1517 DBG3("Found location #3");
1518 consumer_to_use = consumerd32_bin;
1519 } else {
1520 DBG("Could not find any valid consumerd executable");
1521 break;
1522 }
1523 DBG("Using kernel consumer at: %s", consumer_to_use);
1524 execl(consumer_to_use,
1525 "lttng-consumerd", verbosity, "-k",
1526 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1527 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1528 NULL);
1529 break;
1530 case LTTNG_CONSUMER64_UST:
1531 {
1532 char *tmpnew = NULL;
1533
1534 if (consumerd64_libdir[0] != '\0') {
1535 char *tmp;
1536 size_t tmplen;
1537
1538 tmp = getenv("LD_LIBRARY_PATH");
1539 if (!tmp) {
1540 tmp = "";
1541 }
1542 tmplen = strlen("LD_LIBRARY_PATH=")
1543 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1544 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1545 if (!tmpnew) {
1546 ret = -ENOMEM;
1547 goto error;
1548 }
1549 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1550 strcat(tmpnew, consumerd64_libdir);
1551 if (tmp[0] != '\0') {
1552 strcat(tmpnew, ":");
1553 strcat(tmpnew, tmp);
1554 }
1555 ret = putenv(tmpnew);
1556 if (ret) {
1557 ret = -errno;
1558 goto error;
1559 }
1560 }
1561 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1562 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
1566 if (consumerd64_libdir[0] != '\0') {
1567 free(tmpnew);
1568 }
1569 if (ret) {
1570 goto error;
1571 }
1572 break;
1573 }
1574 case LTTNG_CONSUMER32_UST:
1575 {
1576 char *tmpnew = NULL;
1577
1578 if (consumerd32_libdir[0] != '\0') {
1579 char *tmp;
1580 size_t tmplen;
1581
1582 tmp = getenv("LD_LIBRARY_PATH");
1583 if (!tmp) {
1584 tmp = "";
1585 }
1586 tmplen = strlen("LD_LIBRARY_PATH=")
1587 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1588 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1589 if (!tmpnew) {
1590 ret = -ENOMEM;
1591 goto error;
1592 }
1593 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1594 strcat(tmpnew, consumerd32_libdir);
1595 if (tmp[0] != '\0') {
1596 strcat(tmpnew, ":");
1597 strcat(tmpnew, tmp);
1598 }
1599 ret = putenv(tmpnew);
1600 if (ret) {
1601 ret = -errno;
1602 goto error;
1603 }
1604 }
1605 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1606 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1607 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1608 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1609 NULL);
1610 if (consumerd32_libdir[0] != '\0') {
1611 free(tmpnew);
1612 }
1613 if (ret) {
1614 goto error;
1615 }
1616 break;
1617 }
1618 default:
1619 perror("unknown consumer type");
1620 exit(EXIT_FAILURE);
1621 }
1622 if (errno != 0) {
1623 perror("kernel start consumer exec");
1624 }
1625 exit(EXIT_FAILURE);
1626 } else if (pid > 0) {
1627 ret = pid;
1628 } else {
1629 perror("start consumer fork");
1630 ret = -errno;
1631 }
1632 error:
1633 return ret;
1634 }
1635
1636 /*
1637 * Spawn the consumerd daemon and session daemon thread.
1638 */
1639 static int start_consumerd(struct consumer_data *consumer_data)
1640 {
1641 int ret;
1642
1643 pthread_mutex_lock(&consumer_data->pid_mutex);
1644 if (consumer_data->pid != 0) {
1645 pthread_mutex_unlock(&consumer_data->pid_mutex);
1646 goto end;
1647 }
1648
1649 ret = spawn_consumerd(consumer_data);
1650 if (ret < 0) {
1651 ERR("Spawning consumerd failed");
1652 pthread_mutex_unlock(&consumer_data->pid_mutex);
1653 goto error;
1654 }
1655
1656 /* Setting up the consumer_data pid */
1657 consumer_data->pid = ret;
1658 DBG2("Consumer pid %d", consumer_data->pid);
1659 pthread_mutex_unlock(&consumer_data->pid_mutex);
1660
1661 DBG2("Spawning consumer control thread");
1662 ret = spawn_consumer_thread(consumer_data);
1663 if (ret < 0) {
1664 ERR("Fatal error spawning consumer control thread");
1665 goto error;
1666 }
1667
1668 end:
1669 return 0;
1670
1671 error:
1672 return ret;
1673 }
1674
1675 /*
1676 * Check version of the lttng-modules.
1677 */
1678 static int validate_lttng_modules_version(void)
1679 {
1680 return kernel_validate_version(kernel_tracer_fd);
1681 }
1682
1683 /*
1684 * Setup necessary data for kernel tracer action.
1685 */
1686 static int init_kernel_tracer(void)
1687 {
1688 int ret;
1689
1690 /* Modprobe lttng kernel modules */
1691 ret = modprobe_lttng_control();
1692 if (ret < 0) {
1693 goto error;
1694 }
1695
1696 /* Open debugfs lttng */
1697 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1698 if (kernel_tracer_fd < 0) {
1699 DBG("Failed to open %s", module_proc_lttng);
1700 ret = -1;
1701 goto error_open;
1702 }
1703
1704 /* Validate kernel version */
1705 ret = validate_lttng_modules_version();
1706 if (ret < 0) {
1707 goto error_version;
1708 }
1709
1710 ret = modprobe_lttng_data();
1711 if (ret < 0) {
1712 goto error_modules;
1713 }
1714
1715 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1716 return 0;
1717
1718 error_version:
1719 modprobe_remove_lttng_control();
1720 close(kernel_tracer_fd);
1721 kernel_tracer_fd = 0;
1722 return LTTCOMM_KERN_VERSION;
1723
1724 error_modules:
1725 close(kernel_tracer_fd);
1726
1727 error_open:
1728 modprobe_remove_lttng_control();
1729
1730 error:
1731 WARN("No kernel tracer available");
1732 kernel_tracer_fd = 0;
1733 return LTTCOMM_KERN_NA;
1734 }
1735
1736 /*
1737 * Init tracing by creating trace directory and sending fds kernel consumer.
1738 */
1739 static int init_kernel_tracing(struct ltt_kernel_session *session)
1740 {
1741 int ret = 0;
1742
1743 if (session->consumer_fds_sent == 0) {
1744 /*
1745 * Assign default kernel consumer socket if no consumer assigned to the
1746 * kernel session. At this point, it's NOT suppose to be 0 but this is
1747 * an extra security check.
1748 */
1749 if (session->consumer_fd == 0) {
1750 session->consumer_fd = kconsumer_data.cmd_sock;
1751 }
1752
1753 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1754 if (ret < 0) {
1755 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1756 goto error;
1757 }
1758
1759 session->consumer_fds_sent = 1;
1760 }
1761
1762 error:
1763 return ret;
1764 }
1765
1766 /*
1767 * Create an UST session and add it to the session ust list.
1768 */
1769 static int create_ust_session(struct ltt_session *session,
1770 struct lttng_domain *domain)
1771 {
1772 struct ltt_ust_session *lus = NULL;
1773 int ret;
1774
1775 switch (domain->type) {
1776 case LTTNG_DOMAIN_UST:
1777 break;
1778 default:
1779 ret = LTTCOMM_UNKNOWN_DOMAIN;
1780 goto error;
1781 }
1782
1783 DBG("Creating UST session");
1784
1785 lus = trace_ust_create_session(session->path, session->id, domain);
1786 if (lus == NULL) {
1787 ret = LTTCOMM_UST_SESS_FAIL;
1788 goto error;
1789 }
1790
1791 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1792 session->uid, session->gid);
1793 if (ret < 0) {
1794 if (ret != -EEXIST) {
1795 ERR("Trace directory creation error");
1796 ret = LTTCOMM_UST_SESS_FAIL;
1797 goto error;
1798 }
1799 }
1800
1801 /* The domain type dictate different actions on session creation */
1802 switch (domain->type) {
1803 case LTTNG_DOMAIN_UST:
1804 /* No ustctl for the global UST domain */
1805 break;
1806 default:
1807 ERR("Unknown UST domain on create session %d", domain->type);
1808 goto error;
1809 }
1810 lus->uid = session->uid;
1811 lus->gid = session->gid;
1812 session->ust_session = lus;
1813
1814 return LTTCOMM_OK;
1815
1816 error:
1817 free(lus);
1818 return ret;
1819 }
1820
1821 /*
1822 * Create a kernel tracer session then create the default channel.
1823 */
1824 static int create_kernel_session(struct ltt_session *session)
1825 {
1826 int ret;
1827
1828 DBG("Creating kernel session");
1829
1830 ret = kernel_create_session(session, kernel_tracer_fd);
1831 if (ret < 0) {
1832 ret = LTTCOMM_KERN_SESS_FAIL;
1833 goto error;
1834 }
1835
1836 /* Set kernel consumer socket fd */
1837 if (kconsumer_data.cmd_sock) {
1838 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1839 }
1840
1841 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1842 S_IRWXU | S_IRWXG, session->uid, session->gid);
1843 if (ret < 0) {
1844 if (ret != -EEXIST) {
1845 ERR("Trace directory creation error");
1846 goto error;
1847 }
1848 }
1849 session->kernel_session->uid = session->uid;
1850 session->kernel_session->gid = session->gid;
1851
1852 error:
1853 return ret;
1854 }
1855
1856 /*
1857 * Check if the UID or GID match the session. Root user has access to all
1858 * sessions.
1859 */
1860 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1861 {
1862 if (uid != session->uid && gid != session->gid && uid != 0) {
1863 return 0;
1864 } else {
1865 return 1;
1866 }
1867 }
1868
1869 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1870 {
1871 unsigned int i = 0;
1872 struct ltt_session *session;
1873
1874 DBG("Counting number of available session for UID %d GID %d",
1875 uid, gid);
1876 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1877 /*
1878 * Only list the sessions the user can control.
1879 */
1880 if (!session_access_ok(session, uid, gid)) {
1881 continue;
1882 }
1883 i++;
1884 }
1885 return i;
1886 }
1887
1888 /*
1889 * Using the session list, filled a lttng_session array to send back to the
1890 * client for session listing.
1891 *
1892 * The session list lock MUST be acquired before calling this function. Use
1893 * session_lock_list() and session_unlock_list().
1894 */
1895 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1896 gid_t gid)
1897 {
1898 unsigned int i = 0;
1899 struct ltt_session *session;
1900
1901 DBG("Getting all available session for UID %d GID %d",
1902 uid, gid);
1903 /*
1904 * Iterate over session list and append data after the control struct in
1905 * the buffer.
1906 */
1907 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1908 /*
1909 * Only list the sessions the user can control.
1910 */
1911 if (!session_access_ok(session, uid, gid)) {
1912 continue;
1913 }
1914 strncpy(sessions[i].path, session->path, PATH_MAX);
1915 sessions[i].path[PATH_MAX - 1] = '\0';
1916 strncpy(sessions[i].name, session->name, NAME_MAX);
1917 sessions[i].name[NAME_MAX - 1] = '\0';
1918 sessions[i].enabled = session->enabled;
1919 i++;
1920 }
1921 }
1922
1923 /*
1924 * Fill lttng_channel array of all channels.
1925 */
1926 static void list_lttng_channels(int domain, struct ltt_session *session,
1927 struct lttng_channel *channels)
1928 {
1929 int i = 0;
1930 struct ltt_kernel_channel *kchan;
1931
1932 DBG("Listing channels for session %s", session->name);
1933
1934 switch (domain) {
1935 case LTTNG_DOMAIN_KERNEL:
1936 /* Kernel channels */
1937 if (session->kernel_session != NULL) {
1938 cds_list_for_each_entry(kchan,
1939 &session->kernel_session->channel_list.head, list) {
1940 /* Copy lttng_channel struct to array */
1941 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1942 channels[i].enabled = kchan->enabled;
1943 i++;
1944 }
1945 }
1946 break;
1947 case LTTNG_DOMAIN_UST:
1948 {
1949 struct lttng_ht_iter iter;
1950 struct ltt_ust_channel *uchan;
1951
1952 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1953 &iter.iter, uchan, node.node) {
1954 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1955 channels[i].attr.overwrite = uchan->attr.overwrite;
1956 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1957 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1958 channels[i].attr.switch_timer_interval =
1959 uchan->attr.switch_timer_interval;
1960 channels[i].attr.read_timer_interval =
1961 uchan->attr.read_timer_interval;
1962 channels[i].enabled = uchan->enabled;
1963 switch (uchan->attr.output) {
1964 case LTTNG_UST_MMAP:
1965 default:
1966 channels[i].attr.output = LTTNG_EVENT_MMAP;
1967 break;
1968 }
1969 i++;
1970 }
1971 break;
1972 }
1973 default:
1974 break;
1975 }
1976 }
1977
1978 /*
1979 * Create a list of ust global domain events.
1980 */
1981 static int list_lttng_ust_global_events(char *channel_name,
1982 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1983 {
1984 int i = 0, ret = 0;
1985 unsigned int nb_event = 0;
1986 struct lttng_ht_iter iter;
1987 struct lttng_ht_node_str *node;
1988 struct ltt_ust_channel *uchan;
1989 struct ltt_ust_event *uevent;
1990 struct lttng_event *tmp;
1991
1992 DBG("Listing UST global events for channel %s", channel_name);
1993
1994 rcu_read_lock();
1995
1996 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
1997 node = lttng_ht_iter_get_node_str(&iter);
1998 if (node == NULL) {
1999 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2000 goto error;
2001 }
2002
2003 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2004
2005 nb_event += lttng_ht_get_count(uchan->events);
2006
2007 if (nb_event == 0) {
2008 ret = nb_event;
2009 goto error;
2010 }
2011
2012 DBG3("Listing UST global %d events", nb_event);
2013
2014 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2015 if (tmp == NULL) {
2016 ret = -LTTCOMM_FATAL;
2017 goto error;
2018 }
2019
2020 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2021 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2022 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2023 tmp[i].enabled = uevent->enabled;
2024 switch (uevent->attr.instrumentation) {
2025 case LTTNG_UST_TRACEPOINT:
2026 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2027 break;
2028 case LTTNG_UST_PROBE:
2029 tmp[i].type = LTTNG_EVENT_PROBE;
2030 break;
2031 case LTTNG_UST_FUNCTION:
2032 tmp[i].type = LTTNG_EVENT_FUNCTION;
2033 break;
2034 }
2035 strncpy(tmp[i].loglevel, uevent->attr.loglevel, LTTNG_SYMBOL_NAME_LEN);
2036 tmp[i].loglevel[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2037 switch (uevent->attr.loglevel_type) {
2038 case LTTNG_UST_LOGLEVEL:
2039 tmp[i].type = LTTNG_EVENT_LOGLEVEL;
2040 break;
2041 case LTTNG_UST_LOGLEVEL_ONLY:
2042 tmp[i].type = LTTNG_EVENT_LOGLEVEL_ONLY;
2043 break;
2044 }
2045 i++;
2046 }
2047
2048 ret = nb_event;
2049 *events = tmp;
2050
2051 error:
2052 rcu_read_unlock();
2053 return ret;
2054 }
2055
2056 /*
2057 * Fill lttng_event array of all kernel events in the channel.
2058 */
2059 static int list_lttng_kernel_events(char *channel_name,
2060 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2061 {
2062 int i = 0, ret;
2063 unsigned int nb_event;
2064 struct ltt_kernel_event *event;
2065 struct ltt_kernel_channel *kchan;
2066
2067 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2068 if (kchan == NULL) {
2069 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2070 goto error;
2071 }
2072
2073 nb_event = kchan->event_count;
2074
2075 DBG("Listing events for channel %s", kchan->channel->name);
2076
2077 if (nb_event == 0) {
2078 ret = nb_event;
2079 goto error;
2080 }
2081
2082 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2083 if (*events == NULL) {
2084 ret = LTTCOMM_FATAL;
2085 goto error;
2086 }
2087
2088 /* Kernel channels */
2089 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2090 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2091 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2092 (*events)[i].enabled = event->enabled;
2093 switch (event->event->instrumentation) {
2094 case LTTNG_KERNEL_TRACEPOINT:
2095 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2096 break;
2097 case LTTNG_KERNEL_KPROBE:
2098 case LTTNG_KERNEL_KRETPROBE:
2099 (*events)[i].type = LTTNG_EVENT_PROBE;
2100 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2101 sizeof(struct lttng_kernel_kprobe));
2102 break;
2103 case LTTNG_KERNEL_FUNCTION:
2104 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2105 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2106 sizeof(struct lttng_kernel_function));
2107 break;
2108 case LTTNG_KERNEL_NOOP:
2109 (*events)[i].type = LTTNG_EVENT_NOOP;
2110 break;
2111 case LTTNG_KERNEL_SYSCALL:
2112 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2113 break;
2114 case LTTNG_KERNEL_ALL:
2115 assert(0);
2116 break;
2117 }
2118 i++;
2119 }
2120
2121 return nb_event;
2122
2123 error:
2124 return ret;
2125 }
2126
2127 /*
2128 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2129 */
2130 static int cmd_disable_channel(struct ltt_session *session,
2131 int domain, char *channel_name)
2132 {
2133 int ret;
2134 struct ltt_ust_session *usess;
2135
2136 usess = session->ust_session;
2137
2138 switch (domain) {
2139 case LTTNG_DOMAIN_KERNEL:
2140 {
2141 ret = channel_kernel_disable(session->kernel_session,
2142 channel_name);
2143 if (ret != LTTCOMM_OK) {
2144 goto error;
2145 }
2146
2147 kernel_wait_quiescent(kernel_tracer_fd);
2148 break;
2149 }
2150 case LTTNG_DOMAIN_UST:
2151 {
2152 struct ltt_ust_channel *uchan;
2153 struct lttng_ht *chan_ht;
2154
2155 chan_ht = usess->domain_global.channels;
2156
2157 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2158 if (uchan == NULL) {
2159 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2160 goto error;
2161 }
2162
2163 ret = channel_ust_disable(usess, domain, uchan);
2164 if (ret != LTTCOMM_OK) {
2165 goto error;
2166 }
2167 break;
2168 }
2169 #if 0
2170 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2171 case LTTNG_DOMAIN_UST_EXEC_NAME:
2172 case LTTNG_DOMAIN_UST_PID:
2173 #endif
2174 default:
2175 ret = LTTCOMM_UNKNOWN_DOMAIN;
2176 goto error;
2177 }
2178
2179 ret = LTTCOMM_OK;
2180
2181 error:
2182 return ret;
2183 }
2184
2185 /*
2186 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2187 */
2188 static int cmd_enable_channel(struct ltt_session *session,
2189 int domain, struct lttng_channel *attr)
2190 {
2191 int ret;
2192 struct ltt_ust_session *usess = session->ust_session;
2193 struct lttng_ht *chan_ht;
2194
2195 DBG("Enabling channel %s for session %s", attr->name, session->name);
2196
2197 switch (domain) {
2198 case LTTNG_DOMAIN_KERNEL:
2199 {
2200 struct ltt_kernel_channel *kchan;
2201
2202 kchan = trace_kernel_get_channel_by_name(attr->name,
2203 session->kernel_session);
2204 if (kchan == NULL) {
2205 ret = channel_kernel_create(session->kernel_session,
2206 attr, kernel_poll_pipe[1]);
2207 } else {
2208 ret = channel_kernel_enable(session->kernel_session, kchan);
2209 }
2210
2211 if (ret != LTTCOMM_OK) {
2212 goto error;
2213 }
2214
2215 kernel_wait_quiescent(kernel_tracer_fd);
2216 break;
2217 }
2218 case LTTNG_DOMAIN_UST:
2219 {
2220 struct ltt_ust_channel *uchan;
2221
2222 chan_ht = usess->domain_global.channels;
2223
2224 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2225 if (uchan == NULL) {
2226 ret = channel_ust_create(usess, domain, attr);
2227 } else {
2228 ret = channel_ust_enable(usess, domain, uchan);
2229 }
2230 break;
2231 }
2232 #if 0
2233 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2234 case LTTNG_DOMAIN_UST_EXEC_NAME:
2235 case LTTNG_DOMAIN_UST_PID:
2236 #endif
2237 default:
2238 ret = LTTCOMM_UNKNOWN_DOMAIN;
2239 goto error;
2240 }
2241
2242 error:
2243 return ret;
2244 }
2245
2246 /*
2247 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2248 */
2249 static int cmd_disable_event(struct ltt_session *session, int domain,
2250 char *channel_name, char *event_name)
2251 {
2252 int ret;
2253
2254 switch (domain) {
2255 case LTTNG_DOMAIN_KERNEL:
2256 {
2257 struct ltt_kernel_channel *kchan;
2258 struct ltt_kernel_session *ksess;
2259
2260 ksess = session->kernel_session;
2261
2262 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2263 if (kchan == NULL) {
2264 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2265 goto error;
2266 }
2267
2268 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2269 if (ret != LTTCOMM_OK) {
2270 goto error;
2271 }
2272
2273 kernel_wait_quiescent(kernel_tracer_fd);
2274 break;
2275 }
2276 case LTTNG_DOMAIN_UST:
2277 {
2278 struct ltt_ust_channel *uchan;
2279 struct ltt_ust_session *usess;
2280
2281 usess = session->ust_session;
2282
2283 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2284 channel_name);
2285 if (uchan == NULL) {
2286 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2287 goto error;
2288 }
2289
2290 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2291 if (ret != LTTCOMM_OK) {
2292 goto error;
2293 }
2294
2295 DBG3("Disable UST event %s in channel %s completed", event_name,
2296 channel_name);
2297 break;
2298 }
2299 #if 0
2300 case LTTNG_DOMAIN_UST_EXEC_NAME:
2301 case LTTNG_DOMAIN_UST_PID:
2302 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2303 #endif
2304 default:
2305 ret = LTTCOMM_UND;
2306 goto error;
2307 }
2308
2309 ret = LTTCOMM_OK;
2310
2311 error:
2312 return ret;
2313 }
2314
2315 /*
2316 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2317 */
2318 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2319 char *channel_name)
2320 {
2321 int ret;
2322
2323 switch (domain) {
2324 case LTTNG_DOMAIN_KERNEL:
2325 {
2326 struct ltt_kernel_session *ksess;
2327 struct ltt_kernel_channel *kchan;
2328
2329 ksess = session->kernel_session;
2330
2331 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2332 if (kchan == NULL) {
2333 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2334 goto error;
2335 }
2336
2337 ret = event_kernel_disable_all(ksess, kchan);
2338 if (ret != LTTCOMM_OK) {
2339 goto error;
2340 }
2341
2342 kernel_wait_quiescent(kernel_tracer_fd);
2343 break;
2344 }
2345 case LTTNG_DOMAIN_UST:
2346 {
2347 struct ltt_ust_session *usess;
2348 struct ltt_ust_channel *uchan;
2349
2350 usess = session->ust_session;
2351
2352 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2353 channel_name);
2354 if (uchan == NULL) {
2355 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2356 goto error;
2357 }
2358
2359 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2360 if (ret != 0) {
2361 goto error;
2362 }
2363
2364 DBG3("Disable all UST events in channel %s completed", channel_name);
2365
2366 break;
2367 }
2368 #if 0
2369 case LTTNG_DOMAIN_UST_EXEC_NAME:
2370 case LTTNG_DOMAIN_UST_PID:
2371 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2372 #endif
2373 default:
2374 ret = LTTCOMM_UND;
2375 goto error;
2376 }
2377
2378 ret = LTTCOMM_OK;
2379
2380 error:
2381 return ret;
2382 }
2383
2384 /*
2385 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2386 */
2387 static int cmd_add_context(struct ltt_session *session, int domain,
2388 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2389 {
2390 int ret;
2391
2392 switch (domain) {
2393 case LTTNG_DOMAIN_KERNEL:
2394 /* Add kernel context to kernel tracer */
2395 ret = context_kernel_add(session->kernel_session, ctx,
2396 event_name, channel_name);
2397 if (ret != LTTCOMM_OK) {
2398 goto error;
2399 }
2400 break;
2401 case LTTNG_DOMAIN_UST:
2402 {
2403 struct ltt_ust_session *usess = session->ust_session;
2404
2405 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2406 if (ret != LTTCOMM_OK) {
2407 goto error;
2408 }
2409 break;
2410 }
2411 #if 0
2412 case LTTNG_DOMAIN_UST_EXEC_NAME:
2413 case LTTNG_DOMAIN_UST_PID:
2414 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2415 #endif
2416 default:
2417 ret = LTTCOMM_UND;
2418 goto error;
2419 }
2420
2421 ret = LTTCOMM_OK;
2422
2423 error:
2424 return ret;
2425 }
2426
2427 /*
2428 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2429 *
2430 * TODO: currently, both events and loglevels are kept within the same
2431 * namespace for UST global registry/app registery, so if an event
2432 * happen to have the same name as the loglevel (very unlikely though),
2433 * and an attempt is made to enable/disable both in the same session,
2434 * the first to be created will be the only one allowed to exist.
2435 */
2436 static int cmd_enable_event(struct ltt_session *session, int domain,
2437 char *channel_name, struct lttng_event *event)
2438 {
2439 int ret;
2440 struct lttng_channel *attr;
2441 struct ltt_ust_session *usess = session->ust_session;
2442
2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
2445 {
2446 struct ltt_kernel_channel *kchan;
2447
2448 kchan = trace_kernel_get_channel_by_name(channel_name,
2449 session->kernel_session);
2450 if (kchan == NULL) {
2451 attr = channel_new_default_attr(domain);
2452 if (attr == NULL) {
2453 ret = LTTCOMM_FATAL;
2454 goto error;
2455 }
2456 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2457
2458 /* This call will notify the kernel thread */
2459 ret = channel_kernel_create(session->kernel_session,
2460 attr, kernel_poll_pipe[1]);
2461 if (ret != LTTCOMM_OK) {
2462 free(attr);
2463 goto error;
2464 }
2465 free(attr);
2466 }
2467
2468 /* Get the newly created kernel channel pointer */
2469 kchan = trace_kernel_get_channel_by_name(channel_name,
2470 session->kernel_session);
2471 if (kchan == NULL) {
2472 /* This sould not happen... */
2473 ret = LTTCOMM_FATAL;
2474 goto error;
2475 }
2476
2477 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2478 event);
2479 if (ret != LTTCOMM_OK) {
2480 goto error;
2481 }
2482
2483 kernel_wait_quiescent(kernel_tracer_fd);
2484 break;
2485 }
2486 case LTTNG_DOMAIN_UST:
2487 {
2488 struct lttng_channel *attr;
2489 struct ltt_ust_channel *uchan;
2490
2491 /* Get channel from global UST domain */
2492 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2493 channel_name);
2494 if (uchan == NULL) {
2495 /* Create default channel */
2496 attr = channel_new_default_attr(domain);
2497 if (attr == NULL) {
2498 ret = LTTCOMM_FATAL;
2499 goto error;
2500 }
2501 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2502 attr->name[NAME_MAX - 1] = '\0';
2503
2504 ret = channel_ust_create(usess, domain, attr);
2505 if (ret != LTTCOMM_OK) {
2506 free(attr);
2507 goto error;
2508 }
2509 free(attr);
2510
2511 /* Get the newly created channel reference back */
2512 uchan = trace_ust_find_channel_by_name(
2513 usess->domain_global.channels, channel_name);
2514 if (uchan == NULL) {
2515 /* Something is really wrong */
2516 ret = LTTCOMM_FATAL;
2517 goto error;
2518 }
2519 }
2520
2521 /* At this point, the session and channel exist on the tracer */
2522 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2523 if (ret != LTTCOMM_OK) {
2524 goto error;
2525 }
2526 break;
2527 }
2528 #if 0
2529 case LTTNG_DOMAIN_UST_EXEC_NAME:
2530 case LTTNG_DOMAIN_UST_PID:
2531 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2532 #endif
2533 default:
2534 ret = LTTCOMM_UND;
2535 goto error;
2536 }
2537
2538 ret = LTTCOMM_OK;
2539
2540 error:
2541 return ret;
2542 }
2543
2544 /*
2545 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2546 */
2547 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2548 char *channel_name, int event_type)
2549 {
2550 int ret;
2551 struct ltt_kernel_channel *kchan;
2552
2553 switch (domain) {
2554 case LTTNG_DOMAIN_KERNEL:
2555 kchan = trace_kernel_get_channel_by_name(channel_name,
2556 session->kernel_session);
2557 if (kchan == NULL) {
2558 /* This call will notify the kernel thread */
2559 ret = channel_kernel_create(session->kernel_session, NULL,
2560 kernel_poll_pipe[1]);
2561 if (ret != LTTCOMM_OK) {
2562 goto error;
2563 }
2564
2565 /* Get the newly created kernel channel pointer */
2566 kchan = trace_kernel_get_channel_by_name(channel_name,
2567 session->kernel_session);
2568 if (kchan == NULL) {
2569 /* This sould not happen... */
2570 ret = LTTCOMM_FATAL;
2571 goto error;
2572 }
2573
2574 }
2575
2576 switch (event_type) {
2577 case LTTNG_EVENT_SYSCALL:
2578 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2579 kchan, kernel_tracer_fd);
2580 break;
2581 case LTTNG_EVENT_TRACEPOINT:
2582 /*
2583 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2584 * events already registered to the channel.
2585 */
2586 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2587 kchan, kernel_tracer_fd);
2588 break;
2589 case LTTNG_EVENT_ALL:
2590 /* Enable syscalls and tracepoints */
2591 ret = event_kernel_enable_all(session->kernel_session,
2592 kchan, kernel_tracer_fd);
2593 break;
2594 default:
2595 ret = LTTCOMM_KERN_ENABLE_FAIL;
2596 goto error;
2597 }
2598
2599 /* Manage return value */
2600 if (ret != LTTCOMM_OK) {
2601 goto error;
2602 }
2603
2604 kernel_wait_quiescent(kernel_tracer_fd);
2605 break;
2606 case LTTNG_DOMAIN_UST:
2607 {
2608 struct lttng_channel *attr;
2609 struct ltt_ust_channel *uchan;
2610 struct ltt_ust_session *usess = session->ust_session;
2611
2612 /* Get channel from global UST domain */
2613 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2614 channel_name);
2615 if (uchan == NULL) {
2616 /* Create default channel */
2617 attr = channel_new_default_attr(domain);
2618 if (attr == NULL) {
2619 ret = LTTCOMM_FATAL;
2620 goto error;
2621 }
2622 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2623 attr->name[NAME_MAX - 1] = '\0';
2624
2625 /* Use the internal command enable channel */
2626 ret = channel_ust_create(usess, domain, attr);
2627 if (ret != LTTCOMM_OK) {
2628 free(attr);
2629 goto error;
2630 }
2631 free(attr);
2632
2633 /* Get the newly created channel reference back */
2634 uchan = trace_ust_find_channel_by_name(
2635 usess->domain_global.channels, channel_name);
2636 if (uchan == NULL) {
2637 /* Something is really wrong */
2638 ret = LTTCOMM_FATAL;
2639 goto error;
2640 }
2641 }
2642
2643 /* At this point, the session and channel exist on the tracer */
2644
2645 switch (event_type) {
2646 case LTTNG_EVENT_ALL:
2647 case LTTNG_EVENT_TRACEPOINT:
2648 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2649 if (ret != LTTCOMM_OK) {
2650 goto error;
2651 }
2652 break;
2653 default:
2654 ret = LTTCOMM_UST_ENABLE_FAIL;
2655 goto error;
2656 }
2657
2658 /* Manage return value */
2659 if (ret != LTTCOMM_OK) {
2660 goto error;
2661 }
2662
2663 break;
2664 }
2665 #if 0
2666 case LTTNG_DOMAIN_UST_EXEC_NAME:
2667 case LTTNG_DOMAIN_UST_PID:
2668 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2669 #endif
2670 default:
2671 ret = LTTCOMM_UND;
2672 goto error;
2673 }
2674
2675 ret = LTTCOMM_OK;
2676
2677 error:
2678 return ret;
2679 }
2680
2681 /*
2682 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2683 */
2684 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2685 {
2686 int ret;
2687 ssize_t nb_events = 0;
2688
2689 switch (domain) {
2690 case LTTNG_DOMAIN_KERNEL:
2691 nb_events = kernel_list_events(kernel_tracer_fd, events);
2692 if (nb_events < 0) {
2693 ret = LTTCOMM_KERN_LIST_FAIL;
2694 goto error;
2695 }
2696 break;
2697 case LTTNG_DOMAIN_UST:
2698 nb_events = ust_app_list_events(events);
2699 if (nb_events < 0) {
2700 ret = LTTCOMM_UST_LIST_FAIL;
2701 goto error;
2702 }
2703 break;
2704 default:
2705 ret = LTTCOMM_UND;
2706 goto error;
2707 }
2708
2709 return nb_events;
2710
2711 error:
2712 /* Return negative value to differentiate return code */
2713 return -ret;
2714 }
2715
2716 /*
2717 * Command LTTNG_START_TRACE processed by the client thread.
2718 */
2719 static int cmd_start_trace(struct ltt_session *session)
2720 {
2721 int ret;
2722 struct ltt_kernel_session *ksession;
2723 struct ltt_ust_session *usess;
2724
2725 /* Short cut */
2726 ksession = session->kernel_session;
2727 usess = session->ust_session;
2728
2729 if (session->enabled) {
2730 ret = LTTCOMM_UST_START_FAIL;
2731 goto error;
2732 }
2733
2734 session->enabled = 1;
2735
2736 /* Kernel tracing */
2737 if (ksession != NULL) {
2738 struct ltt_kernel_channel *kchan;
2739
2740 /* Open kernel metadata */
2741 if (ksession->metadata == NULL) {
2742 ret = kernel_open_metadata(ksession, ksession->trace_path);
2743 if (ret < 0) {
2744 ret = LTTCOMM_KERN_META_FAIL;
2745 goto error;
2746 }
2747 }
2748
2749 /* Open kernel metadata stream */
2750 if (ksession->metadata_stream_fd == 0) {
2751 ret = kernel_open_metadata_stream(ksession);
2752 if (ret < 0) {
2753 ERR("Kernel create metadata stream failed");
2754 ret = LTTCOMM_KERN_STREAM_FAIL;
2755 goto error;
2756 }
2757 }
2758
2759 /* For each channel */
2760 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2761 if (kchan->stream_count == 0) {
2762 ret = kernel_open_channel_stream(kchan);
2763 if (ret < 0) {
2764 ret = LTTCOMM_KERN_STREAM_FAIL;
2765 goto error;
2766 }
2767 /* Update the stream global counter */
2768 ksession->stream_count_global += ret;
2769 }
2770 }
2771
2772 /* Setup kernel consumer socket and send fds to it */
2773 ret = init_kernel_tracing(ksession);
2774 if (ret < 0) {
2775 ret = LTTCOMM_KERN_START_FAIL;
2776 goto error;
2777 }
2778
2779 /* This start the kernel tracing */
2780 ret = kernel_start_session(ksession);
2781 if (ret < 0) {
2782 ret = LTTCOMM_KERN_START_FAIL;
2783 goto error;
2784 }
2785
2786 /* Quiescent wait after starting trace */
2787 kernel_wait_quiescent(kernel_tracer_fd);
2788 }
2789
2790 /* Flag session that trace should start automatically */
2791 if (usess) {
2792 usess->start_trace = 1;
2793
2794 ret = ust_app_start_trace_all(usess);
2795 if (ret < 0) {
2796 ret = LTTCOMM_UST_START_FAIL;
2797 goto error;
2798 }
2799 }
2800
2801 ret = LTTCOMM_OK;
2802
2803 error:
2804 return ret;
2805 }
2806
2807 /*
2808 * Command LTTNG_STOP_TRACE processed by the client thread.
2809 */
2810 static int cmd_stop_trace(struct ltt_session *session)
2811 {
2812 int ret;
2813 struct ltt_kernel_channel *kchan;
2814 struct ltt_kernel_session *ksession;
2815 struct ltt_ust_session *usess;
2816
2817 /* Short cut */
2818 ksession = session->kernel_session;
2819 usess = session->ust_session;
2820
2821 if (!session->enabled) {
2822 ret = LTTCOMM_UST_STOP_FAIL;
2823 goto error;
2824 }
2825
2826 session->enabled = 0;
2827
2828 /* Kernel tracer */
2829 if (ksession != NULL) {
2830 DBG("Stop kernel tracing");
2831
2832 /* Flush all buffers before stopping */
2833 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2834 if (ret < 0) {
2835 ERR("Kernel metadata flush failed");
2836 }
2837
2838 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2839 ret = kernel_flush_buffer(kchan);
2840 if (ret < 0) {
2841 ERR("Kernel flush buffer error");
2842 }
2843 }
2844
2845 ret = kernel_stop_session(ksession);
2846 if (ret < 0) {
2847 ret = LTTCOMM_KERN_STOP_FAIL;
2848 goto error;
2849 }
2850
2851 kernel_wait_quiescent(kernel_tracer_fd);
2852 }
2853
2854 if (usess) {
2855 usess->start_trace = 0;
2856
2857 ret = ust_app_stop_trace_all(usess);
2858 if (ret < 0) {
2859 ret = LTTCOMM_UST_STOP_FAIL;
2860 goto error;
2861 }
2862 }
2863
2864 ret = LTTCOMM_OK;
2865
2866 error:
2867 return ret;
2868 }
2869
2870 /*
2871 * Command LTTNG_CREATE_SESSION processed by the client thread.
2872 */
2873 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2874 {
2875 int ret;
2876
2877 ret = session_create(name, path, creds->uid, creds->gid);
2878 if (ret != LTTCOMM_OK) {
2879 goto error;
2880 }
2881
2882 ret = LTTCOMM_OK;
2883
2884 error:
2885 return ret;
2886 }
2887
2888 /*
2889 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2890 */
2891 static int cmd_destroy_session(struct ltt_session *session, char *name)
2892 {
2893 int ret;
2894
2895 /* Clean kernel session teardown */
2896 teardown_kernel_session(session);
2897 /* UST session teardown */
2898 teardown_ust_session(session);
2899
2900 /*
2901 * Must notify the kernel thread here to update it's poll setin order
2902 * to remove the channel(s)' fd just destroyed.
2903 */
2904 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2905 if (ret < 0) {
2906 perror("write kernel poll pipe");
2907 }
2908
2909 ret = session_destroy(session);
2910
2911 return ret;
2912 }
2913
2914 /*
2915 * Command LTTNG_CALIBRATE processed by the client thread.
2916 */
2917 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2918 {
2919 int ret;
2920
2921 switch (domain) {
2922 case LTTNG_DOMAIN_KERNEL:
2923 {
2924 struct lttng_kernel_calibrate kcalibrate;
2925
2926 kcalibrate.type = calibrate->type;
2927 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2928 if (ret < 0) {
2929 ret = LTTCOMM_KERN_ENABLE_FAIL;
2930 goto error;
2931 }
2932 break;
2933 }
2934 case LTTNG_DOMAIN_UST:
2935 {
2936 struct lttng_ust_calibrate ucalibrate;
2937
2938 ucalibrate.type = calibrate->type;
2939 ret = ust_app_calibrate_glb(&ucalibrate);
2940 if (ret < 0) {
2941 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2942 goto error;
2943 }
2944 break;
2945 }
2946 default:
2947 ret = LTTCOMM_UND;
2948 goto error;
2949 }
2950
2951 ret = LTTCOMM_OK;
2952
2953 error:
2954 return ret;
2955 }
2956
2957 /*
2958 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2959 */
2960 static int cmd_register_consumer(struct ltt_session *session, int domain,
2961 char *sock_path)
2962 {
2963 int ret, sock;
2964
2965 switch (domain) {
2966 case LTTNG_DOMAIN_KERNEL:
2967 /* Can't register a consumer if there is already one */
2968 if (session->kernel_session->consumer_fds_sent != 0) {
2969 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2970 goto error;
2971 }
2972
2973 sock = lttcomm_connect_unix_sock(sock_path);
2974 if (sock < 0) {
2975 ret = LTTCOMM_CONNECT_FAIL;
2976 goto error;
2977 }
2978
2979 session->kernel_session->consumer_fd = sock;
2980 break;
2981 default:
2982 /* TODO: Userspace tracing */
2983 ret = LTTCOMM_UND;
2984 goto error;
2985 }
2986
2987 ret = LTTCOMM_OK;
2988
2989 error:
2990 return ret;
2991 }
2992
2993 /*
2994 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2995 */
2996 static ssize_t cmd_list_domains(struct ltt_session *session,
2997 struct lttng_domain **domains)
2998 {
2999 int ret, index = 0;
3000 ssize_t nb_dom = 0;
3001
3002 if (session->kernel_session != NULL) {
3003 DBG3("Listing domains found kernel domain");
3004 nb_dom++;
3005 }
3006
3007 if (session->ust_session != NULL) {
3008 DBG3("Listing domains found UST global domain");
3009 nb_dom++;
3010 }
3011
3012 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3013 if (*domains == NULL) {
3014 ret = -LTTCOMM_FATAL;
3015 goto error;
3016 }
3017
3018 if (session->kernel_session != NULL) {
3019 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3020 index++;
3021 }
3022
3023 if (session->ust_session != NULL) {
3024 (*domains)[index].type = LTTNG_DOMAIN_UST;
3025 index++;
3026 }
3027
3028 return nb_dom;
3029
3030 error:
3031 return ret;
3032 }
3033
3034 /*
3035 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3036 */
3037 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3038 struct lttng_channel **channels)
3039 {
3040 int ret;
3041 ssize_t nb_chan = 0;
3042
3043 switch (domain) {
3044 case LTTNG_DOMAIN_KERNEL:
3045 if (session->kernel_session != NULL) {
3046 nb_chan = session->kernel_session->channel_count;
3047 }
3048 DBG3("Number of kernel channels %zd", nb_chan);
3049 break;
3050 case LTTNG_DOMAIN_UST:
3051 if (session->ust_session != NULL) {
3052 nb_chan = lttng_ht_get_count(
3053 session->ust_session->domain_global.channels);
3054 }
3055 DBG3("Number of UST global channels %zd", nb_chan);
3056 break;
3057 default:
3058 *channels = NULL;
3059 ret = -LTTCOMM_UND;
3060 goto error;
3061 }
3062
3063 if (nb_chan > 0) {
3064 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3065 if (*channels == NULL) {
3066 ret = -LTTCOMM_FATAL;
3067 goto error;
3068 }
3069
3070 list_lttng_channels(domain, session, *channels);
3071 } else {
3072 *channels = NULL;
3073 }
3074
3075 return nb_chan;
3076
3077 error:
3078 return ret;
3079 }
3080
3081 /*
3082 * Command LTTNG_LIST_EVENTS processed by the client thread.
3083 */
3084 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3085 char *channel_name, struct lttng_event **events)
3086 {
3087 int ret = 0;
3088 ssize_t nb_event = 0;
3089
3090 switch (domain) {
3091 case LTTNG_DOMAIN_KERNEL:
3092 if (session->kernel_session != NULL) {
3093 nb_event = list_lttng_kernel_events(channel_name,
3094 session->kernel_session, events);
3095 }
3096 break;
3097 case LTTNG_DOMAIN_UST:
3098 {
3099 if (session->ust_session != NULL) {
3100 nb_event = list_lttng_ust_global_events(channel_name,
3101 &session->ust_session->domain_global, events);
3102 }
3103 break;
3104 }
3105 default:
3106 ret = -LTTCOMM_UND;
3107 goto error;
3108 }
3109
3110 ret = nb_event;
3111
3112 error:
3113 return ret;
3114 }
3115
3116 /*
3117 * Process the command requested by the lttng client within the command
3118 * context structure. This function make sure that the return structure (llm)
3119 * is set and ready for transmission before returning.
3120 *
3121 * Return any error encountered or 0 for success.
3122 */
3123 static int process_client_msg(struct command_ctx *cmd_ctx)
3124 {
3125 int ret = LTTCOMM_OK;
3126 int need_tracing_session = 1;
3127
3128 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3129
3130 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3131 ret = LTTCOMM_KERN_NA;
3132 goto error;
3133 }
3134
3135 /*
3136 * Check for command that don't needs to allocate a returned payload. We do
3137 * this here so we don't have to make the call for no payload at each
3138 * command.
3139 */
3140 switch(cmd_ctx->lsm->cmd_type) {
3141 case LTTNG_LIST_SESSIONS:
3142 case LTTNG_LIST_TRACEPOINTS:
3143 case LTTNG_LIST_DOMAINS:
3144 case LTTNG_LIST_CHANNELS:
3145 case LTTNG_LIST_EVENTS:
3146 break;
3147 default:
3148 /* Setup lttng message with no payload */
3149 ret = setup_lttng_msg(cmd_ctx, 0);
3150 if (ret < 0) {
3151 /* This label does not try to unlock the session */
3152 goto init_setup_error;
3153 }
3154 }
3155
3156 /* Commands that DO NOT need a session. */
3157 switch (cmd_ctx->lsm->cmd_type) {
3158 case LTTNG_CALIBRATE:
3159 case LTTNG_CREATE_SESSION:
3160 case LTTNG_LIST_SESSIONS:
3161 case LTTNG_LIST_TRACEPOINTS:
3162 need_tracing_session = 0;
3163 break;
3164 default:
3165 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3166 session_lock_list();
3167 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3168 session_unlock_list();
3169 if (cmd_ctx->session == NULL) {
3170 if (cmd_ctx->lsm->session.name != NULL) {
3171 ret = LTTCOMM_SESS_NOT_FOUND;
3172 } else {
3173 /* If no session name specified */
3174 ret = LTTCOMM_SELECT_SESS;
3175 }
3176 goto error;
3177 } else {
3178 /* Acquire lock for the session */
3179 session_lock(cmd_ctx->session);
3180 }
3181 break;
3182 }
3183
3184 /*
3185 * Check domain type for specific "pre-action".
3186 */
3187 switch (cmd_ctx->lsm->domain.type) {
3188 case LTTNG_DOMAIN_KERNEL:
3189 if (!is_root) {
3190 ret = LTTCOMM_KERN_NA;
3191 goto error;
3192 }
3193
3194 /* Kernel tracer check */
3195 if (kernel_tracer_fd == 0) {
3196 /* Basically, load kernel tracer modules */
3197 ret = init_kernel_tracer();
3198 if (ret != 0) {
3199 goto error;
3200 }
3201 }
3202
3203 /* Need a session for kernel command */
3204 if (need_tracing_session) {
3205 if (cmd_ctx->session->kernel_session == NULL) {
3206 ret = create_kernel_session(cmd_ctx->session);
3207 if (ret < 0) {
3208 ret = LTTCOMM_KERN_SESS_FAIL;
3209 goto error;
3210 }
3211 }
3212
3213 /* Start the kernel consumer daemon */
3214 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3215 if (kconsumer_data.pid == 0 &&
3216 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3217 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3218 ret = start_consumerd(&kconsumer_data);
3219 if (ret < 0) {
3220 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3221 goto error;
3222 }
3223 } else {
3224 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3225 }
3226 }
3227 break;
3228 case LTTNG_DOMAIN_UST:
3229 {
3230 if (need_tracing_session) {
3231 if (cmd_ctx->session->ust_session == NULL) {
3232 ret = create_ust_session(cmd_ctx->session,
3233 &cmd_ctx->lsm->domain);
3234 if (ret != LTTCOMM_OK) {
3235 goto error;
3236 }
3237 }
3238 /* Start the UST consumer daemons */
3239 /* 64-bit */
3240 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3241 if (consumerd64_bin[0] != '\0' &&
3242 ustconsumer64_data.pid == 0 &&
3243 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3244 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3245 ret = start_consumerd(&ustconsumer64_data);
3246 if (ret < 0) {
3247 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3248 ust_consumerd64_fd = -EINVAL;
3249 goto error;
3250 }
3251
3252 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3253 } else {
3254 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3255 }
3256 /* 32-bit */
3257 if (consumerd32_bin[0] != '\0' &&
3258 ustconsumer32_data.pid == 0 &&
3259 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3260 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3261 ret = start_consumerd(&ustconsumer32_data);
3262 if (ret < 0) {
3263 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3264 ust_consumerd32_fd = -EINVAL;
3265 goto error;
3266 }
3267 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3268 } else {
3269 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3270 }
3271 }
3272 break;
3273 }
3274 default:
3275 break;
3276 }
3277
3278 /*
3279 * Check that the UID or GID match that of the tracing session.
3280 * The root user can interact with all sessions.
3281 */
3282 if (need_tracing_session) {
3283 if (!session_access_ok(cmd_ctx->session,
3284 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3285 ret = LTTCOMM_EPERM;
3286 goto error;
3287 }
3288 }
3289
3290 /* Process by command type */
3291 switch (cmd_ctx->lsm->cmd_type) {
3292 case LTTNG_ADD_CONTEXT:
3293 {
3294 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3295 cmd_ctx->lsm->u.context.channel_name,
3296 cmd_ctx->lsm->u.context.event_name,
3297 &cmd_ctx->lsm->u.context.ctx);
3298 break;
3299 }
3300 case LTTNG_DISABLE_CHANNEL:
3301 {
3302 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3303 cmd_ctx->lsm->u.disable.channel_name);
3304 break;
3305 }
3306 case LTTNG_DISABLE_EVENT:
3307 {
3308 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3309 cmd_ctx->lsm->u.disable.channel_name,
3310 cmd_ctx->lsm->u.disable.name);
3311 ret = LTTCOMM_OK;
3312 break;
3313 }
3314 case LTTNG_DISABLE_ALL_EVENT:
3315 {
3316 DBG("Disabling all events");
3317
3318 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3319 cmd_ctx->lsm->u.disable.channel_name);
3320 break;
3321 }
3322 case LTTNG_ENABLE_CHANNEL:
3323 {
3324 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3325 &cmd_ctx->lsm->u.channel.chan);
3326 break;
3327 }
3328 case LTTNG_ENABLE_EVENT:
3329 {
3330 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3331 cmd_ctx->lsm->u.enable.channel_name,
3332 &cmd_ctx->lsm->u.enable.event);
3333 break;
3334 }
3335 case LTTNG_ENABLE_ALL_EVENT:
3336 {
3337 DBG("Enabling all events");
3338
3339 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3340 cmd_ctx->lsm->u.enable.channel_name,
3341 cmd_ctx->lsm->u.enable.event.type);
3342 break;
3343 }
3344 case LTTNG_LIST_TRACEPOINTS:
3345 {
3346 struct lttng_event *events;
3347 ssize_t nb_events;
3348
3349 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3350 if (nb_events < 0) {
3351 ret = -nb_events;
3352 goto error;
3353 }
3354
3355 /*
3356 * Setup lttng message with payload size set to the event list size in
3357 * bytes and then copy list into the llm payload.
3358 */
3359 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3360 if (ret < 0) {
3361 free(events);
3362 goto setup_error;
3363 }
3364
3365 /* Copy event list into message payload */
3366 memcpy(cmd_ctx->llm->payload, events,
3367 sizeof(struct lttng_event) * nb_events);
3368
3369 free(events);
3370
3371 ret = LTTCOMM_OK;
3372 break;
3373 }
3374 case LTTNG_START_TRACE:
3375 {
3376 ret = cmd_start_trace(cmd_ctx->session);
3377 break;
3378 }
3379 case LTTNG_STOP_TRACE:
3380 {
3381 ret = cmd_stop_trace(cmd_ctx->session);
3382 break;
3383 }
3384 case LTTNG_CREATE_SESSION:
3385 {
3386 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3387 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3388 break;
3389 }
3390 case LTTNG_DESTROY_SESSION:
3391 {
3392 ret = cmd_destroy_session(cmd_ctx->session,
3393 cmd_ctx->lsm->session.name);
3394 break;
3395 }
3396 case LTTNG_LIST_DOMAINS:
3397 {
3398 ssize_t nb_dom;
3399 struct lttng_domain *domains;
3400
3401 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3402 if (nb_dom < 0) {
3403 ret = -nb_dom;
3404 goto error;
3405 }
3406
3407 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3408 if (ret < 0) {
3409 goto setup_error;
3410 }
3411
3412 /* Copy event list into message payload */
3413 memcpy(cmd_ctx->llm->payload, domains,
3414 nb_dom * sizeof(struct lttng_domain));
3415
3416 free(domains);
3417
3418 ret = LTTCOMM_OK;
3419 break;
3420 }
3421 case LTTNG_LIST_CHANNELS:
3422 {
3423 size_t nb_chan;
3424 struct lttng_channel *channels;
3425
3426 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3427 cmd_ctx->session, &channels);
3428 if (nb_chan < 0) {
3429 ret = -nb_chan;
3430 goto error;
3431 }
3432
3433 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3434 if (ret < 0) {
3435 goto setup_error;
3436 }
3437
3438 /* Copy event list into message payload */
3439 memcpy(cmd_ctx->llm->payload, channels,
3440 nb_chan * sizeof(struct lttng_channel));
3441
3442 free(channels);
3443
3444 ret = LTTCOMM_OK;
3445 break;
3446 }
3447 case LTTNG_LIST_EVENTS:
3448 {
3449 ssize_t nb_event;
3450 struct lttng_event *events = NULL;
3451
3452 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3453 cmd_ctx->lsm->u.list.channel_name, &events);
3454 if (nb_event < 0) {
3455 ret = -nb_event;
3456 goto error;
3457 }
3458
3459 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3460 if (ret < 0) {
3461 goto setup_error;
3462 }
3463
3464 /* Copy event list into message payload */
3465 memcpy(cmd_ctx->llm->payload, events,
3466 nb_event * sizeof(struct lttng_event));
3467
3468 free(events);
3469
3470 ret = LTTCOMM_OK;
3471 break;
3472 }
3473 case LTTNG_LIST_SESSIONS:
3474 {
3475 unsigned int nr_sessions;
3476
3477 session_lock_list();
3478 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3479 if (nr_sessions == 0) {
3480 ret = LTTCOMM_NO_SESSION;
3481 session_unlock_list();
3482 goto error;
3483 }
3484 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3485 if (ret < 0) {
3486 session_unlock_list();
3487 goto setup_error;
3488 }
3489
3490 /* Filled the session array */
3491 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3492 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3493
3494 session_unlock_list();
3495
3496 ret = LTTCOMM_OK;
3497 break;
3498 }
3499 case LTTNG_CALIBRATE:
3500 {
3501 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3502 &cmd_ctx->lsm->u.calibrate);
3503 break;
3504 }
3505 case LTTNG_REGISTER_CONSUMER:
3506 {
3507 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3508 cmd_ctx->lsm->u.reg.path);
3509 break;
3510 }
3511 default:
3512 ret = LTTCOMM_UND;
3513 break;
3514 }
3515
3516 error:
3517 if (cmd_ctx->llm == NULL) {
3518 DBG("Missing llm structure. Allocating one.");
3519 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3520 goto setup_error;
3521 }
3522 }
3523 /* Set return code */
3524 cmd_ctx->llm->ret_code = ret;
3525 setup_error:
3526 if (cmd_ctx->session) {
3527 session_unlock(cmd_ctx->session);
3528 }
3529 init_setup_error:
3530 return ret;
3531 }
3532
3533 /*
3534 * This thread manage all clients request using the unix client socket for
3535 * communication.
3536 */
3537 static void *thread_manage_clients(void *data)
3538 {
3539 int sock = 0, ret, i, pollfd;
3540 uint32_t revents, nb_fd;
3541 struct command_ctx *cmd_ctx = NULL;
3542 struct lttng_poll_event events;
3543
3544 DBG("[thread] Manage client started");
3545
3546 rcu_register_thread();
3547
3548 ret = lttcomm_listen_unix_sock(client_sock);
3549 if (ret < 0) {
3550 goto error;
3551 }
3552
3553 /*
3554 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3555 * more will be added to this poll set.
3556 */
3557 ret = create_thread_poll_set(&events, 2);
3558 if (ret < 0) {
3559 goto error;
3560 }
3561
3562 /* Add the application registration socket */
3563 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3564 if (ret < 0) {
3565 goto error;
3566 }
3567
3568 /*
3569 * Notify parent pid that we are ready to accept command for client side.
3570 */
3571 if (opt_sig_parent) {
3572 kill(ppid, SIGUSR1);
3573 }
3574
3575 while (1) {
3576 DBG("Accepting client command ...");
3577
3578 nb_fd = LTTNG_POLL_GETNB(&events);
3579
3580 /* Inifinite blocking call, waiting for transmission */
3581 ret = lttng_poll_wait(&events, -1);
3582 if (ret < 0) {
3583 goto error;
3584 }
3585
3586 for (i = 0; i < nb_fd; i++) {
3587 /* Fetch once the poll data */
3588 revents = LTTNG_POLL_GETEV(&events, i);
3589 pollfd = LTTNG_POLL_GETFD(&events, i);
3590
3591 /* Thread quit pipe has been closed. Killing thread. */
3592 ret = check_thread_quit_pipe(pollfd, revents);
3593 if (ret) {
3594 goto error;
3595 }
3596
3597 /* Event on the registration socket */
3598 if (pollfd == client_sock) {
3599 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3600 ERR("Client socket poll error");
3601 goto error;
3602 }
3603 }
3604 }
3605
3606 DBG("Wait for client response");
3607
3608 sock = lttcomm_accept_unix_sock(client_sock);
3609 if (sock < 0) {
3610 goto error;
3611 }
3612
3613 /* Set socket option for credentials retrieval */
3614 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3615 if (ret < 0) {
3616 goto error;
3617 }
3618
3619 /* Allocate context command to process the client request */
3620 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3621 if (cmd_ctx == NULL) {
3622 perror("zmalloc cmd_ctx");
3623 goto error;
3624 }
3625
3626 /* Allocate data buffer for reception */
3627 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3628 if (cmd_ctx->lsm == NULL) {
3629 perror("zmalloc cmd_ctx->lsm");
3630 goto error;
3631 }
3632
3633 cmd_ctx->llm = NULL;
3634 cmd_ctx->session = NULL;
3635
3636 /*
3637 * Data is received from the lttng client. The struct
3638 * lttcomm_session_msg (lsm) contains the command and data request of
3639 * the client.
3640 */
3641 DBG("Receiving data from client ...");
3642 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3643 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3644 if (ret <= 0) {
3645 DBG("Nothing recv() from client... continuing");
3646 close(sock);
3647 free(cmd_ctx);
3648 continue;
3649 }
3650
3651 // TODO: Validate cmd_ctx including sanity check for
3652 // security purpose.
3653
3654 rcu_thread_online();
3655 /*
3656 * This function dispatch the work to the kernel or userspace tracer
3657 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3658 * informations for the client. The command context struct contains
3659 * everything this function may needs.
3660 */
3661 ret = process_client_msg(cmd_ctx);
3662 rcu_thread_offline();
3663 if (ret < 0) {
3664 /*
3665 * TODO: Inform client somehow of the fatal error. At
3666 * this point, ret < 0 means that a zmalloc failed
3667 * (ENOMEM). Error detected but still accept command.
3668 */
3669 clean_command_ctx(&cmd_ctx);
3670 continue;
3671 }
3672
3673 DBG("Sending response (size: %d, retcode: %s)",
3674 cmd_ctx->lttng_msg_size,
3675 lttng_strerror(-cmd_ctx->llm->ret_code));
3676 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3677 if (ret < 0) {
3678 ERR("Failed to send data back to client");
3679 }
3680
3681 /* End of transmission */
3682 close(sock);
3683
3684 clean_command_ctx(&cmd_ctx);
3685 }
3686
3687 error:
3688 DBG("Client thread dying");
3689 unlink(client_unix_sock_path);
3690 close(client_sock);
3691 close(sock);
3692
3693 lttng_poll_clean(&events);
3694 clean_command_ctx(&cmd_ctx);
3695
3696 rcu_unregister_thread();
3697 return NULL;
3698 }
3699
3700
3701 /*
3702 * usage function on stderr
3703 */
3704 static void usage(void)
3705 {
3706 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3707 fprintf(stderr, " -h, --help Display this usage.\n");
3708 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3709 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3710 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3711 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3712 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3713 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3714 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3715 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3716 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3717 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3718 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3719 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3720 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3721 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3722 fprintf(stderr, " -V, --version Show version number.\n");
3723 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3724 fprintf(stderr, " -q, --quiet No output at all.\n");
3725 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3726 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3727 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3728 }
3729
3730 /*
3731 * daemon argument parsing
3732 */
3733 static int parse_args(int argc, char **argv)
3734 {
3735 int c;
3736
3737 static struct option long_options[] = {
3738 { "client-sock", 1, 0, 'c' },
3739 { "apps-sock", 1, 0, 'a' },
3740 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3741 { "kconsumerd-err-sock", 1, 0, 'E' },
3742 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3743 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3744 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3745 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3746 { "consumerd32-path", 1, 0, 'u' },
3747 { "consumerd32-libdir", 1, 0, 'U' },
3748 { "consumerd64-path", 1, 0, 't' },
3749 { "consumerd64-libdir", 1, 0, 'T' },
3750 { "daemonize", 0, 0, 'd' },
3751 { "sig-parent", 0, 0, 'S' },
3752 { "help", 0, 0, 'h' },
3753 { "group", 1, 0, 'g' },
3754 { "version", 0, 0, 'V' },
3755 { "quiet", 0, 0, 'q' },
3756 { "verbose", 0, 0, 'v' },
3757 { "verbose-consumer", 0, 0, 'Z' },
3758 { "no-kernel", 0, 0, 'N' },
3759 { NULL, 0, 0, 0 }
3760 };
3761
3762 while (1) {
3763 int option_index = 0;
3764 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3765 long_options, &option_index);
3766 if (c == -1) {
3767 break;
3768 }
3769
3770 switch (c) {
3771 case 0:
3772 fprintf(stderr, "option %s", long_options[option_index].name);
3773 if (optarg) {
3774 fprintf(stderr, " with arg %s\n", optarg);
3775 }
3776 break;
3777 case 'c':
3778 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3779 break;
3780 case 'a':
3781 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3782 break;
3783 case 'd':
3784 opt_daemon = 1;
3785 break;
3786 case 'g':
3787 opt_tracing_group = optarg;
3788 break;
3789 case 'h':
3790 usage();
3791 exit(EXIT_FAILURE);
3792 case 'V':
3793 fprintf(stdout, "%s\n", VERSION);
3794 exit(EXIT_SUCCESS);
3795 case 'S':
3796 opt_sig_parent = 1;
3797 break;
3798 case 'E':
3799 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3800 break;
3801 case 'C':
3802 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3803 break;
3804 case 'F':
3805 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3806 break;
3807 case 'D':
3808 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3809 break;
3810 case 'H':
3811 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3812 break;
3813 case 'G':
3814 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3815 break;
3816 case 'N':
3817 opt_no_kernel = 1;
3818 break;
3819 case 'q':
3820 opt_quiet = 1;
3821 break;
3822 case 'v':
3823 /* Verbose level can increase using multiple -v */
3824 opt_verbose += 1;
3825 break;
3826 case 'Z':
3827 opt_verbose_consumer += 1;
3828 break;
3829 case 'u':
3830 consumerd32_bin= optarg;
3831 break;
3832 case 'U':
3833 consumerd32_libdir = optarg;
3834 break;
3835 case 't':
3836 consumerd64_bin = optarg;
3837 break;
3838 case 'T':
3839 consumerd64_libdir = optarg;
3840 break;
3841 default:
3842 /* Unknown option or other error.
3843 * Error is printed by getopt, just return */
3844 return -1;
3845 }
3846 }
3847
3848 return 0;
3849 }
3850
3851 /*
3852 * Creates the two needed socket by the daemon.
3853 * apps_sock - The communication socket for all UST apps.
3854 * client_sock - The communication of the cli tool (lttng).
3855 */
3856 static int init_daemon_socket(void)
3857 {
3858 int ret = 0;
3859 mode_t old_umask;
3860
3861 old_umask = umask(0);
3862
3863 /* Create client tool unix socket */
3864 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3865 if (client_sock < 0) {
3866 ERR("Create unix sock failed: %s", client_unix_sock_path);
3867 ret = -1;
3868 goto end;
3869 }
3870
3871 /* File permission MUST be 660 */
3872 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3873 if (ret < 0) {
3874 ERR("Set file permissions failed: %s", client_unix_sock_path);
3875 perror("chmod");
3876 goto end;
3877 }
3878
3879 /* Create the application unix socket */
3880 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3881 if (apps_sock < 0) {
3882 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3883 ret = -1;
3884 goto end;
3885 }
3886
3887 /* File permission MUST be 666 */
3888 ret = chmod(apps_unix_sock_path,
3889 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3890 if (ret < 0) {
3891 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3892 perror("chmod");
3893 goto end;
3894 }
3895
3896 end:
3897 umask(old_umask);
3898 return ret;
3899 }
3900
3901 /*
3902 * Check if the global socket is available, and if a daemon is answering at the
3903 * other side. If yes, error is returned.
3904 */
3905 static int check_existing_daemon(void)
3906 {
3907 if (access(client_unix_sock_path, F_OK) < 0 &&
3908 access(apps_unix_sock_path, F_OK) < 0) {
3909 return 0;
3910 }
3911
3912 /* Is there anybody out there ? */
3913 if (lttng_session_daemon_alive()) {
3914 return -EEXIST;
3915 } else {
3916 return 0;
3917 }
3918 }
3919
3920 /*
3921 * Set the tracing group gid onto the client socket.
3922 *
3923 * Race window between mkdir and chown is OK because we are going from more
3924 * permissive (root.root) to les permissive (root.tracing).
3925 */
3926 static int set_permissions(char *rundir)
3927 {
3928 int ret;
3929 gid_t gid;
3930
3931 gid = allowed_group();
3932 if (gid < 0) {
3933 WARN("No tracing group detected");
3934 ret = 0;
3935 goto end;
3936 }
3937
3938 /* Set lttng run dir */
3939 ret = chown(rundir, 0, gid);
3940 if (ret < 0) {
3941 ERR("Unable to set group on %s", rundir);
3942 perror("chown");
3943 }
3944
3945 /* lttng client socket path */
3946 ret = chown(client_unix_sock_path, 0, gid);
3947 if (ret < 0) {
3948 ERR("Unable to set group on %s", client_unix_sock_path);
3949 perror("chown");
3950 }
3951
3952 /* kconsumer error socket path */
3953 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3954 if (ret < 0) {
3955 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3956 perror("chown");
3957 }
3958
3959 /* 64-bit ustconsumer error socket path */
3960 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3961 if (ret < 0) {
3962 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3963 perror("chown");
3964 }
3965
3966 /* 32-bit ustconsumer compat32 error socket path */
3967 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3968 if (ret < 0) {
3969 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3970 perror("chown");
3971 }
3972
3973 DBG("All permissions are set");
3974
3975 end:
3976 return ret;
3977 }
3978
3979 /*
3980 * Create the pipe used to wake up the kernel thread.
3981 */
3982 static int create_kernel_poll_pipe(void)
3983 {
3984 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3985 }
3986
3987 /*
3988 * Create the application command pipe to wake thread_manage_apps.
3989 */
3990 static int create_apps_cmd_pipe(void)
3991 {
3992 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3993 }
3994
3995 /*
3996 * Create the lttng run directory needed for all global sockets and pipe.
3997 */
3998 static int create_lttng_rundir(const char *rundir)
3999 {
4000 int ret;
4001
4002 DBG3("Creating LTTng run directory: %s", rundir);
4003
4004 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4005 if (ret < 0) {
4006 if (errno != EEXIST) {
4007 ERR("Unable to create %s", rundir);
4008 goto error;
4009 } else {
4010 ret = 0;
4011 }
4012 }
4013
4014 error:
4015 return ret;
4016 }
4017
4018 /*
4019 * Setup sockets and directory needed by the kconsumerd communication with the
4020 * session daemon.
4021 */
4022 static int set_consumer_sockets(struct consumer_data *consumer_data,
4023 const char *rundir)
4024 {
4025 int ret;
4026 char path[PATH_MAX];
4027
4028 switch (consumer_data->type) {
4029 case LTTNG_CONSUMER_KERNEL:
4030 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4031 break;
4032 case LTTNG_CONSUMER64_UST:
4033 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4034 break;
4035 case LTTNG_CONSUMER32_UST:
4036 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4037 break;
4038 default:
4039 ERR("Consumer type unknown");
4040 ret = -EINVAL;
4041 goto error;
4042 }
4043
4044 DBG2("Creating consumer directory: %s", path);
4045
4046 ret = mkdir(path, S_IRWXU | S_IRWXG);
4047 if (ret < 0) {
4048 if (errno != EEXIST) {
4049 ERR("Failed to create %s", path);
4050 goto error;
4051 }
4052 ret = 0;
4053 }
4054
4055 /* Create the kconsumerd error unix socket */
4056 consumer_data->err_sock =
4057 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4058 if (consumer_data->err_sock < 0) {
4059 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4060 ret = -1;
4061 goto error;
4062 }
4063
4064 /* File permission MUST be 660 */
4065 ret = chmod(consumer_data->err_unix_sock_path,
4066 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4067 if (ret < 0) {
4068 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4069 PERROR("chmod");
4070 goto error;
4071 }
4072
4073 error:
4074 return ret;
4075 }
4076
4077 /*
4078 * Signal handler for the daemon
4079 *
4080 * Simply stop all worker threads, leaving main() return gracefully after
4081 * joining all threads and calling cleanup().
4082 */
4083 static void sighandler(int sig)
4084 {
4085 switch (sig) {
4086 case SIGPIPE:
4087 DBG("SIGPIPE caught");
4088 return;
4089 case SIGINT:
4090 DBG("SIGINT caught");
4091 stop_threads();
4092 break;
4093 case SIGTERM:
4094 DBG("SIGTERM caught");
4095 stop_threads();
4096 break;
4097 default:
4098 break;
4099 }
4100 }
4101
4102 /*
4103 * Setup signal handler for :
4104 * SIGINT, SIGTERM, SIGPIPE
4105 */
4106 static int set_signal_handler(void)
4107 {
4108 int ret = 0;
4109 struct sigaction sa;
4110 sigset_t sigset;
4111
4112 if ((ret = sigemptyset(&sigset)) < 0) {
4113 perror("sigemptyset");
4114 return ret;
4115 }
4116
4117 sa.sa_handler = sighandler;
4118 sa.sa_mask = sigset;
4119 sa.sa_flags = 0;
4120 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4121 perror("sigaction");
4122 return ret;
4123 }
4124
4125 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4126 perror("sigaction");
4127 return ret;
4128 }
4129
4130 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4131 perror("sigaction");
4132 return ret;
4133 }
4134
4135 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4136
4137 return ret;
4138 }
4139
4140 /*
4141 * Set open files limit to unlimited. This daemon can open a large number of
4142 * file descriptors in order to consumer multiple kernel traces.
4143 */
4144 static void set_ulimit(void)
4145 {
4146 int ret;
4147 struct rlimit lim;
4148
4149 /* The kernel does not allowed an infinite limit for open files */
4150 lim.rlim_cur = 65535;
4151 lim.rlim_max = 65535;
4152
4153 ret = setrlimit(RLIMIT_NOFILE, &lim);
4154 if (ret < 0) {
4155 perror("failed to set open files limit");
4156 }
4157 }
4158
4159 /*
4160 * main
4161 */
4162 int main(int argc, char **argv)
4163 {
4164 int ret = 0;
4165 void *status;
4166 const char *home_path;
4167
4168 init_kernel_workarounds();
4169
4170 rcu_register_thread();
4171
4172 /* Create thread quit pipe */
4173 if ((ret = init_thread_quit_pipe()) < 0) {
4174 goto error;
4175 }
4176
4177 setup_consumerd_path();
4178
4179 /* Parse arguments */
4180 progname = argv[0];
4181 if ((ret = parse_args(argc, argv) < 0)) {
4182 goto error;
4183 }
4184
4185 /* Daemonize */
4186 if (opt_daemon) {
4187 ret = daemon(0, 0);
4188 if (ret < 0) {
4189 perror("daemon");
4190 goto error;
4191 }
4192 }
4193
4194 /* Check if daemon is UID = 0 */
4195 is_root = !getuid();
4196
4197 if (is_root) {
4198 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4199
4200 /* Create global run dir with root access */
4201 ret = create_lttng_rundir(rundir);
4202 if (ret < 0) {
4203 goto error;
4204 }
4205
4206 if (strlen(apps_unix_sock_path) == 0) {
4207 snprintf(apps_unix_sock_path, PATH_MAX,
4208 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4209 }
4210
4211 if (strlen(client_unix_sock_path) == 0) {
4212 snprintf(client_unix_sock_path, PATH_MAX,
4213 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4214 }
4215
4216 /* Set global SHM for ust */
4217 if (strlen(wait_shm_path) == 0) {
4218 snprintf(wait_shm_path, PATH_MAX,
4219 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4220 }
4221
4222 /* Setup kernel consumerd path */
4223 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4224 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4225 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4226 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4227
4228 DBG2("Kernel consumer err path: %s",
4229 kconsumer_data.err_unix_sock_path);
4230 DBG2("Kernel consumer cmd path: %s",
4231 kconsumer_data.cmd_unix_sock_path);
4232 } else {
4233 home_path = get_home_dir();
4234 if (home_path == NULL) {
4235 /* TODO: Add --socket PATH option */
4236 ERR("Can't get HOME directory for sockets creation.");
4237 ret = -EPERM;
4238 goto error;
4239 }
4240
4241 /*
4242 * Create rundir from home path. This will create something like
4243 * $HOME/.lttng
4244 */
4245 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4246 if (ret < 0) {
4247 ret = -ENOMEM;
4248 goto error;
4249 }
4250
4251 ret = create_lttng_rundir(rundir);
4252 if (ret < 0) {
4253 goto error;
4254 }
4255
4256 if (strlen(apps_unix_sock_path) == 0) {
4257 snprintf(apps_unix_sock_path, PATH_MAX,
4258 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4259 }
4260
4261 /* Set the cli tool unix socket path */
4262 if (strlen(client_unix_sock_path) == 0) {
4263 snprintf(client_unix_sock_path, PATH_MAX,
4264 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4265 }
4266
4267 /* Set global SHM for ust */
4268 if (strlen(wait_shm_path) == 0) {
4269 snprintf(wait_shm_path, PATH_MAX,
4270 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4271 }
4272 }
4273
4274 DBG("Client socket path %s", client_unix_sock_path);
4275 DBG("Application socket path %s", apps_unix_sock_path);
4276 DBG("LTTng run directory path: %s", rundir);
4277
4278 /* 32 bits consumerd path setup */
4279 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4280 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4281 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4282 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4283
4284 DBG2("UST consumer 32 bits err path: %s",
4285 ustconsumer32_data.err_unix_sock_path);
4286 DBG2("UST consumer 32 bits cmd path: %s",
4287 ustconsumer32_data.cmd_unix_sock_path);
4288
4289 /* 64 bits consumerd path setup */
4290 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4291 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4292 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4293 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4294
4295 DBG2("UST consumer 64 bits err path: %s",
4296 ustconsumer64_data.err_unix_sock_path);
4297 DBG2("UST consumer 64 bits cmd path: %s",
4298 ustconsumer64_data.cmd_unix_sock_path);
4299
4300 /*
4301 * See if daemon already exist.
4302 */
4303 if ((ret = check_existing_daemon()) < 0) {
4304 ERR("Already running daemon.\n");
4305 /*
4306 * We do not goto exit because we must not cleanup()
4307 * because a daemon is already running.
4308 */
4309 goto error;
4310 }
4311
4312 /* After this point, we can safely call cleanup() with "goto exit" */
4313
4314 /*
4315 * These actions must be executed as root. We do that *after* setting up
4316 * the sockets path because we MUST make the check for another daemon using
4317 * those paths *before* trying to set the kernel consumer sockets and init
4318 * kernel tracer.
4319 */
4320 if (is_root) {
4321 ret = set_consumer_sockets(&kconsumer_data, rundir);
4322 if (ret < 0) {
4323 goto exit;
4324 }
4325
4326 /* Setup kernel tracer */
4327 if (!opt_no_kernel) {
4328 init_kernel_tracer();
4329 }
4330
4331 /* Set ulimit for open files */
4332 set_ulimit();
4333 }
4334
4335 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4336 if (ret < 0) {
4337 goto exit;
4338 }
4339
4340 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4341 if (ret < 0) {
4342 goto exit;
4343 }
4344
4345 if ((ret = set_signal_handler()) < 0) {
4346 goto exit;
4347 }
4348
4349 /* Setup the needed unix socket */
4350 if ((ret = init_daemon_socket()) < 0) {
4351 goto exit;
4352 }
4353
4354 /* Set credentials to socket */
4355 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4356 goto exit;
4357 }
4358
4359 /* Get parent pid if -S, --sig-parent is specified. */
4360 if (opt_sig_parent) {
4361 ppid = getppid();
4362 }
4363
4364 /* Setup the kernel pipe for waking up the kernel thread */
4365 if ((ret = create_kernel_poll_pipe()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Setup the thread apps communication pipe. */
4370 if ((ret = create_apps_cmd_pipe()) < 0) {
4371 goto exit;
4372 }
4373
4374 /* Init UST command queue. */
4375 cds_wfq_init(&ust_cmd_queue.queue);
4376
4377 /* Init UST app hash table */
4378 ust_app_ht_alloc();
4379
4380 /*
4381 * Get session list pointer. This pointer MUST NOT be free(). This list is
4382 * statically declared in session.c
4383 */
4384 session_list_ptr = session_get_list();
4385
4386 /* Set up max poll set size */
4387 lttng_poll_set_max_size();
4388
4389 /* Create thread to manage the client socket */
4390 ret = pthread_create(&client_thread, NULL,
4391 thread_manage_clients, (void *) NULL);
4392 if (ret != 0) {
4393 perror("pthread_create clients");
4394 goto exit_client;
4395 }
4396
4397 /* Create thread to dispatch registration */
4398 ret = pthread_create(&dispatch_thread, NULL,
4399 thread_dispatch_ust_registration, (void *) NULL);
4400 if (ret != 0) {
4401 perror("pthread_create dispatch");
4402 goto exit_dispatch;
4403 }
4404
4405 /* Create thread to manage application registration. */
4406 ret = pthread_create(&reg_apps_thread, NULL,
4407 thread_registration_apps, (void *) NULL);
4408 if (ret != 0) {
4409 perror("pthread_create registration");
4410 goto exit_reg_apps;
4411 }
4412
4413 /* Create thread to manage application socket */
4414 ret = pthread_create(&apps_thread, NULL,
4415 thread_manage_apps, (void *) NULL);
4416 if (ret != 0) {
4417 perror("pthread_create apps");
4418 goto exit_apps;
4419 }
4420
4421 /* Create kernel thread to manage kernel event */
4422 ret = pthread_create(&kernel_thread, NULL,
4423 thread_manage_kernel, (void *) NULL);
4424 if (ret != 0) {
4425 perror("pthread_create kernel");
4426 goto exit_kernel;
4427 }
4428
4429 ret = pthread_join(kernel_thread, &status);
4430 if (ret != 0) {
4431 perror("pthread_join");
4432 goto error; /* join error, exit without cleanup */
4433 }
4434
4435 exit_kernel:
4436 ret = pthread_join(apps_thread, &status);
4437 if (ret != 0) {
4438 perror("pthread_join");
4439 goto error; /* join error, exit without cleanup */
4440 }
4441
4442 exit_apps:
4443 ret = pthread_join(reg_apps_thread, &status);
4444 if (ret != 0) {
4445 perror("pthread_join");
4446 goto error; /* join error, exit without cleanup */
4447 }
4448
4449 exit_reg_apps:
4450 ret = pthread_join(dispatch_thread, &status);
4451 if (ret != 0) {
4452 perror("pthread_join");
4453 goto error; /* join error, exit without cleanup */
4454 }
4455
4456 exit_dispatch:
4457 ret = pthread_join(client_thread, &status);
4458 if (ret != 0) {
4459 perror("pthread_join");
4460 goto error; /* join error, exit without cleanup */
4461 }
4462
4463 ret = join_consumer_thread(&kconsumer_data);
4464 if (ret != 0) {
4465 perror("join_consumer");
4466 goto error; /* join error, exit without cleanup */
4467 }
4468
4469 exit_client:
4470 exit:
4471 /*
4472 * cleanup() is called when no other thread is running.
4473 */
4474 rcu_thread_online();
4475 cleanup();
4476 rcu_thread_offline();
4477 rcu_unregister_thread();
4478 if (!ret) {
4479 exit(EXIT_SUCCESS);
4480 }
4481 error:
4482 exit(EXIT_FAILURE);
4483 }
LTTng 2.0 tools and control repository
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