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[lttng-tools.git] / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
44
45 #include <lttngerr.h>
46 #include <runas.h>
47
48 #include "channel.h"
49 #include "compat/poll.h"
50 #include "context.h"
51 #include "event.h"
52 #include "futex.h"
53 #include "hashtable.h"
54 #include "kernel.h"
55 #include "lttng-sessiond.h"
56 #include "shm.h"
57 #include "ust-app.h"
58 #include "ust-ctl.h"
59 #include "utils.h"
60
61 #define CONSUMERD_FILE "lttng-consumerd"
62
63 struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79 };
80
81 /* Const values */
82 const char default_home_dir[] = DEFAULT_HOME_DIR;
83 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
84 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
87 /* Variables */
88 int opt_verbose; /* Not static for lttngerr.h */
89 int opt_verbose_consumer; /* Not static for lttngerr.h */
90 int opt_quiet; /* Not static for lttngerr.h */
91
92 const char *progname;
93 const char *opt_tracing_group;
94 static int opt_sig_parent;
95 static int opt_daemon;
96 static int opt_no_kernel;
97 static int is_root; /* Set to 1 if the daemon is running as root */
98 static pid_t ppid; /* Parent PID for --sig-parent option */
99 static char *rundir;
100
101 /* Consumer daemon specific control data */
102 static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
106 };
107 static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111 };
112 static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
116 };
117
118 static int dispatch_thread_exit;
119
120 /* Global application Unix socket path */
121 static char apps_unix_sock_path[PATH_MAX];
122 /* Global client Unix socket path */
123 static char client_unix_sock_path[PATH_MAX];
124 /* global wait shm path for UST */
125 static char wait_shm_path[PATH_MAX];
126
127 /* Sockets and FDs */
128 static int client_sock;
129 static int apps_sock;
130 static int kernel_tracer_fd;
131 static int kernel_poll_pipe[2];
132
133 /*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137 static int thread_quit_pipe[2];
138
139 /*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143 static int apps_cmd_pipe[2];
144
145 /* Pthread, Mutexes and Semaphores */
146 static pthread_t apps_thread;
147 static pthread_t reg_apps_thread;
148 static pthread_t client_thread;
149 static pthread_t kernel_thread;
150 static pthread_t dispatch_thread;
151
152
153 /*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160 static struct ust_cmd_queue ust_cmd_queue;
161
162 /*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
168 *
169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
170 * session_lock_list and session_unlock_list for lock acquisition.
171 */
172 static struct ltt_session_list *session_list_ptr;
173
174 int ust_consumerd64_fd = -1;
175 int ust_consumerd32_fd = -1;
176
177 static const char *consumerd32_bin =
178 __stringify(CONFIG_CONSUMERD32_BIN);
179 static const char *consumerd64_bin =
180 __stringify(CONFIG_CONSUMERD64_BIN);
181 static const char *consumerd32_libdir =
182 __stringify(CONFIG_CONSUMERD32_LIBDIR);
183 static const char *consumerd64_libdir =
184 __stringify(CONFIG_CONSUMERD64_LIBDIR);
185
186 static
187 void setup_consumerd_path(void)
188 {
189 const char *bin, *libdir;
190
191 /*
192 * Allow INSTALL_BIN_PATH to be used as a target path for the
193 * native architecture size consumer if CONFIG_CONSUMER*_PATH
194 * has not been defined.
195 */
196 #if (CAA_BITS_PER_LONG == 32)
197 if (!consumerd32_bin[0]) {
198 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd32_libdir[0]) {
201 consumerd32_libdir = INSTALL_LIB_PATH;
202 }
203 #elif (CAA_BITS_PER_LONG == 64)
204 if (!consumerd64_bin[0]) {
205 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
206 }
207 if (!consumerd64_libdir[0]) {
208 consumerd64_libdir = INSTALL_LIB_PATH;
209 }
210 #else
211 #error "Unknown bitness"
212 #endif
213
214 /*
215 * runtime env. var. overrides the build default.
216 */
217 bin = getenv("LTTNG_CONSUMERD32_BIN");
218 if (bin) {
219 consumerd32_bin = bin;
220 }
221 bin = getenv("LTTNG_CONSUMERD64_BIN");
222 if (bin) {
223 consumerd64_bin = bin;
224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
226 if (libdir) {
227 consumerd32_libdir = libdir;
228 }
229 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
230 if (libdir) {
231 consumerd64_libdir = libdir;
232 }
233 }
234
235 /*
236 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
237 */
238 static int create_thread_poll_set(struct lttng_poll_event *events,
239 unsigned int size)
240 {
241 int ret;
242
243 if (events == NULL || size == 0) {
244 ret = -1;
245 goto error;
246 }
247
248 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
249 if (ret < 0) {
250 goto error;
251 }
252
253 /* Add quit pipe */
254 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
255 if (ret < 0) {
256 goto error;
257 }
258
259 return 0;
260
261 error:
262 return ret;
263 }
264
265 /*
266 * Check if the thread quit pipe was triggered.
267 *
268 * Return 1 if it was triggered else 0;
269 */
270 static int check_thread_quit_pipe(int fd, uint32_t events)
271 {
272 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
273 return 1;
274 }
275
276 return 0;
277 }
278
279 /*
280 * Remove modules in reverse load order.
281 */
282 static int modprobe_remove_kernel_modules(void)
283 {
284 int ret = 0, i;
285 char modprobe[256];
286
287 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
288 ret = snprintf(modprobe, sizeof(modprobe),
289 "/sbin/modprobe -r -q %s",
290 kernel_modules_list[i].name);
291 if (ret < 0) {
292 perror("snprintf modprobe -r");
293 goto error;
294 }
295 modprobe[sizeof(modprobe) - 1] = '\0';
296 ret = system(modprobe);
297 if (ret == -1) {
298 ERR("Unable to launch modprobe -r for module %s",
299 kernel_modules_list[i].name);
300 } else if (kernel_modules_list[i].required
301 && WEXITSTATUS(ret) != 0) {
302 ERR("Unable to remove module %s",
303 kernel_modules_list[i].name);
304 } else {
305 DBG("Modprobe removal successful %s",
306 kernel_modules_list[i].name);
307 }
308 }
309
310 error:
311 return ret;
312 }
313
314 /*
315 * Return group ID of the tracing group or -1 if not found.
316 */
317 static gid_t allowed_group(void)
318 {
319 struct group *grp;
320
321 if (opt_tracing_group) {
322 grp = getgrnam(opt_tracing_group);
323 } else {
324 grp = getgrnam(default_tracing_group);
325 }
326 if (!grp) {
327 return -1;
328 } else {
329 return grp->gr_gid;
330 }
331 }
332
333 /*
334 * Init thread quit pipe.
335 *
336 * Return -1 on error or 0 if all pipes are created.
337 */
338 static int init_thread_quit_pipe(void)
339 {
340 int ret;
341
342 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
343 if (ret < 0) {
344 perror("thread quit pipe");
345 goto error;
346 }
347
348 error:
349 return ret;
350 }
351
352 /*
353 * Complete teardown of a kernel session. This free all data structure related
354 * to a kernel session and update counter.
355 */
356 static void teardown_kernel_session(struct ltt_session *session)
357 {
358 if (!session->kernel_session) {
359 DBG3("No kernel session when tearingdown session");
360 return;
361 }
362
363 DBG("Tearing down kernel session");
364
365 /*
366 * If a custom kernel consumer was registered, close the socket before
367 * tearing down the complete kernel session structure
368 */
369 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
370 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
371 }
372
373 trace_kernel_destroy_session(session->kernel_session);
374 }
375
376 /*
377 * Complete teardown of all UST sessions. This will free everything on his path
378 * and destroy the core essence of all ust sessions :)
379 */
380 static void teardown_ust_session(struct ltt_session *session)
381 {
382 int ret;
383
384 if (!session->ust_session) {
385 DBG3("No UST session when tearingdown session");
386 return;
387 }
388
389 DBG("Tearing down UST session(s)");
390
391 ret = ust_app_destroy_trace_all(session->ust_session);
392 if (ret) {
393 ERR("Error in ust_app_destroy_trace_all");
394 }
395
396 trace_ust_destroy_session(session->ust_session);
397 }
398
399 /*
400 * Stop all threads by closing the thread quit pipe.
401 */
402 static void stop_threads(void)
403 {
404 int ret;
405
406 /* Stopping all threads */
407 DBG("Terminating all threads");
408 ret = notify_thread_pipe(thread_quit_pipe[1]);
409 if (ret < 0) {
410 ERR("write error on thread quit pipe");
411 }
412
413 /* Dispatch thread */
414 dispatch_thread_exit = 1;
415 futex_nto1_wake(&ust_cmd_queue.futex);
416 }
417
418 /*
419 * Cleanup the daemon
420 */
421 static void cleanup(void)
422 {
423 int ret;
424 char *cmd;
425 struct ltt_session *sess, *stmp;
426
427 DBG("Cleaning up");
428
429 DBG("Removing %s directory", rundir);
430 ret = asprintf(&cmd, "rm -rf %s", rundir);
431 if (ret < 0) {
432 ERR("asprintf failed. Something is really wrong!");
433 }
434
435 /* Remove lttng run directory */
436 ret = system(cmd);
437 if (ret < 0) {
438 ERR("Unable to clean %s", rundir);
439 }
440 free(cmd);
441
442 DBG("Cleaning up all session");
443
444 /* Destroy session list mutex */
445 if (session_list_ptr != NULL) {
446 pthread_mutex_destroy(&session_list_ptr->lock);
447
448 /* Cleanup ALL session */
449 cds_list_for_each_entry_safe(sess, stmp,
450 &session_list_ptr->head, list) {
451 teardown_kernel_session(sess);
452 teardown_ust_session(sess);
453 free(sess);
454 }
455 }
456
457 DBG("Closing all UST sockets");
458 ust_app_clean_list();
459
460 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
461
462 if (is_root && !opt_no_kernel) {
463 DBG2("Closing kernel fd");
464 close(kernel_tracer_fd);
465 DBG("Unloading kernel modules");
466 modprobe_remove_kernel_modules();
467 }
468
469 close(thread_quit_pipe[0]);
470 close(thread_quit_pipe[1]);
471
472 /* <fun> */
473 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
474 "Matthew, BEET driven development works!%c[%dm",
475 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
476 /* </fun> */
477 }
478
479 /*
480 * Send data on a unix socket using the liblttsessiondcomm API.
481 *
482 * Return lttcomm error code.
483 */
484 static int send_unix_sock(int sock, void *buf, size_t len)
485 {
486 /* Check valid length */
487 if (len <= 0) {
488 return -1;
489 }
490
491 return lttcomm_send_unix_sock(sock, buf, len);
492 }
493
494 /*
495 * Free memory of a command context structure.
496 */
497 static void clean_command_ctx(struct command_ctx **cmd_ctx)
498 {
499 DBG("Clean command context structure");
500 if (*cmd_ctx) {
501 if ((*cmd_ctx)->llm) {
502 free((*cmd_ctx)->llm);
503 }
504 if ((*cmd_ctx)->lsm) {
505 free((*cmd_ctx)->lsm);
506 }
507 free(*cmd_ctx);
508 *cmd_ctx = NULL;
509 }
510 }
511
512 /*
513 * Send all stream fds of kernel channel to the consumer.
514 */
515 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
516 int sock, struct ltt_kernel_channel *channel,
517 uid_t uid, gid_t gid)
518 {
519 int ret;
520 struct ltt_kernel_stream *stream;
521 struct lttcomm_consumer_msg lkm;
522
523 DBG("Sending streams of channel %s to kernel consumer",
524 channel->channel->name);
525
526 /* Send channel */
527 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
528 lkm.u.channel.channel_key = channel->fd;
529 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
530 lkm.u.channel.mmap_len = 0; /* for kernel */
531 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
532 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
533 if (ret < 0) {
534 perror("send consumer channel");
535 goto error;
536 }
537
538 /* Send streams */
539 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
540 if (!stream->fd) {
541 continue;
542 }
543 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
544 lkm.u.stream.channel_key = channel->fd;
545 lkm.u.stream.stream_key = stream->fd;
546 lkm.u.stream.state = stream->state;
547 lkm.u.stream.output = channel->channel->attr.output;
548 lkm.u.stream.mmap_len = 0; /* for kernel */
549 lkm.u.stream.uid = uid;
550 lkm.u.stream.gid = gid;
551 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
552 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
553 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
554 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
555 if (ret < 0) {
556 perror("send consumer stream");
557 goto error;
558 }
559 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
560 if (ret < 0) {
561 perror("send consumer stream ancillary data");
562 goto error;
563 }
564 }
565
566 DBG("consumer channel streams sent");
567
568 return 0;
569
570 error:
571 return ret;
572 }
573
574 /*
575 * Send all stream fds of the kernel session to the consumer.
576 */
577 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
578 struct ltt_kernel_session *session)
579 {
580 int ret;
581 struct ltt_kernel_channel *chan;
582 struct lttcomm_consumer_msg lkm;
583 int sock = session->consumer_fd;
584
585 DBG("Sending metadata stream fd");
586
587 /* Extra protection. It's NOT supposed to be set to 0 at this point */
588 if (session->consumer_fd == 0) {
589 session->consumer_fd = consumer_data->cmd_sock;
590 }
591
592 if (session->metadata_stream_fd != 0) {
593 /* Send metadata channel fd */
594 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
595 lkm.u.channel.channel_key = session->metadata->fd;
596 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
597 lkm.u.channel.mmap_len = 0; /* for kernel */
598 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
599 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
600 if (ret < 0) {
601 perror("send consumer channel");
602 goto error;
603 }
604
605 /* Send metadata stream fd */
606 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
607 lkm.u.stream.channel_key = session->metadata->fd;
608 lkm.u.stream.stream_key = session->metadata_stream_fd;
609 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
610 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
611 lkm.u.stream.mmap_len = 0; /* for kernel */
612 lkm.u.stream.uid = session->uid;
613 lkm.u.stream.gid = session->gid;
614 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
615 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
616 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
617 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
618 if (ret < 0) {
619 perror("send consumer stream");
620 goto error;
621 }
622 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
623 if (ret < 0) {
624 perror("send consumer stream");
625 goto error;
626 }
627 }
628
629 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
630 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
631 session->uid, session->gid);
632 if (ret < 0) {
633 goto error;
634 }
635 }
636
637 DBG("consumer fds (metadata and channel streams) sent");
638
639 return 0;
640
641 error:
642 return ret;
643 }
644
645 /*
646 * Notify UST applications using the shm mmap futex.
647 */
648 static int notify_ust_apps(int active)
649 {
650 char *wait_shm_mmap;
651
652 DBG("Notifying applications of session daemon state: %d", active);
653
654 /* See shm.c for this call implying mmap, shm and futex calls */
655 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
656 if (wait_shm_mmap == NULL) {
657 goto error;
658 }
659
660 /* Wake waiting process */
661 futex_wait_update((int32_t *) wait_shm_mmap, active);
662
663 /* Apps notified successfully */
664 return 0;
665
666 error:
667 return -1;
668 }
669
670 /*
671 * Setup the outgoing data buffer for the response (llm) by allocating the
672 * right amount of memory and copying the original information from the lsm
673 * structure.
674 *
675 * Return total size of the buffer pointed by buf.
676 */
677 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
678 {
679 int ret, buf_size;
680
681 buf_size = size;
682
683 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
684 if (cmd_ctx->llm == NULL) {
685 perror("zmalloc");
686 ret = -ENOMEM;
687 goto error;
688 }
689
690 /* Copy common data */
691 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
692 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
693
694 cmd_ctx->llm->data_size = size;
695 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
696
697 return buf_size;
698
699 error:
700 return ret;
701 }
702
703 /*
704 * Update the kernel poll set of all channel fd available over all tracing
705 * session. Add the wakeup pipe at the end of the set.
706 */
707 static int update_kernel_poll(struct lttng_poll_event *events)
708 {
709 int ret;
710 struct ltt_session *session;
711 struct ltt_kernel_channel *channel;
712
713 DBG("Updating kernel poll set");
714
715 session_lock_list();
716 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
717 session_lock(session);
718 if (session->kernel_session == NULL) {
719 session_unlock(session);
720 continue;
721 }
722
723 cds_list_for_each_entry(channel,
724 &session->kernel_session->channel_list.head, list) {
725 /* Add channel fd to the kernel poll set */
726 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
727 if (ret < 0) {
728 session_unlock(session);
729 goto error;
730 }
731 DBG("Channel fd %d added to kernel set", channel->fd);
732 }
733 session_unlock(session);
734 }
735 session_unlock_list();
736
737 return 0;
738
739 error:
740 session_unlock_list();
741 return -1;
742 }
743
744 /*
745 * Find the channel fd from 'fd' over all tracing session. When found, check
746 * for new channel stream and send those stream fds to the kernel consumer.
747 *
748 * Useful for CPU hotplug feature.
749 */
750 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
751 {
752 int ret = 0;
753 struct ltt_session *session;
754 struct ltt_kernel_channel *channel;
755
756 DBG("Updating kernel streams for channel fd %d", fd);
757
758 session_lock_list();
759 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
760 session_lock(session);
761 if (session->kernel_session == NULL) {
762 session_unlock(session);
763 continue;
764 }
765
766 /* This is not suppose to be 0 but this is an extra security check */
767 if (session->kernel_session->consumer_fd == 0) {
768 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
769 }
770
771 cds_list_for_each_entry(channel,
772 &session->kernel_session->channel_list.head, list) {
773 if (channel->fd == fd) {
774 DBG("Channel found, updating kernel streams");
775 ret = kernel_open_channel_stream(channel);
776 if (ret < 0) {
777 goto error;
778 }
779
780 /*
781 * Have we already sent fds to the consumer? If yes, it means
782 * that tracing is started so it is safe to send our updated
783 * stream fds.
784 */
785 if (session->kernel_session->consumer_fds_sent == 1) {
786 ret = send_kconsumer_channel_streams(consumer_data,
787 session->kernel_session->consumer_fd, channel,
788 session->uid, session->gid);
789 if (ret < 0) {
790 goto error;
791 }
792 }
793 goto error;
794 }
795 }
796 session_unlock(session);
797 }
798 session_unlock_list();
799 return ret;
800
801 error:
802 session_unlock(session);
803 session_unlock_list();
804 return ret;
805 }
806
807 /*
808 * For each tracing session, update newly registered apps.
809 */
810 static void update_ust_app(int app_sock)
811 {
812 struct ltt_session *sess, *stmp;
813
814 /* For all tracing session(s) */
815 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
816 if (sess->ust_session) {
817 ust_app_global_update(sess->ust_session, app_sock);
818 }
819 }
820 }
821
822 /*
823 * This thread manage event coming from the kernel.
824 *
825 * Features supported in this thread:
826 * -) CPU Hotplug
827 */
828 static void *thread_manage_kernel(void *data)
829 {
830 int ret, i, pollfd, update_poll_flag = 1;
831 uint32_t revents, nb_fd;
832 char tmp;
833 struct lttng_poll_event events;
834
835 DBG("Thread manage kernel started");
836
837 ret = create_thread_poll_set(&events, 2);
838 if (ret < 0) {
839 goto error;
840 }
841
842 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
843 if (ret < 0) {
844 goto error;
845 }
846
847 while (1) {
848 if (update_poll_flag == 1) {
849 /*
850 * Reset number of fd in the poll set. Always 2 since there is the thread
851 * quit pipe and the kernel pipe.
852 */
853 events.nb_fd = 2;
854
855 ret = update_kernel_poll(&events);
856 if (ret < 0) {
857 goto error;
858 }
859 update_poll_flag = 0;
860 }
861
862 nb_fd = LTTNG_POLL_GETNB(&events);
863
864 DBG("Thread kernel polling on %d fds", nb_fd);
865
866 /* Zeroed the poll events */
867 lttng_poll_reset(&events);
868
869 /* Poll infinite value of time */
870 ret = lttng_poll_wait(&events, -1);
871 if (ret < 0) {
872 goto error;
873 } else if (ret == 0) {
874 /* Should not happen since timeout is infinite */
875 ERR("Return value of poll is 0 with an infinite timeout.\n"
876 "This should not have happened! Continuing...");
877 continue;
878 }
879
880 for (i = 0; i < nb_fd; i++) {
881 /* Fetch once the poll data */
882 revents = LTTNG_POLL_GETEV(&events, i);
883 pollfd = LTTNG_POLL_GETFD(&events, i);
884
885 /* Thread quit pipe has been closed. Killing thread. */
886 ret = check_thread_quit_pipe(pollfd, revents);
887 if (ret) {
888 goto error;
889 }
890
891 /* Check for data on kernel pipe */
892 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
893 ret = read(kernel_poll_pipe[0], &tmp, 1);
894 update_poll_flag = 1;
895 continue;
896 } else {
897 /*
898 * New CPU detected by the kernel. Adding kernel stream to
899 * kernel session and updating the kernel consumer
900 */
901 if (revents & LPOLLIN) {
902 ret = update_kernel_stream(&kconsumer_data, pollfd);
903 if (ret < 0) {
904 continue;
905 }
906 break;
907 /*
908 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
909 * and unregister kernel stream at this point.
910 */
911 }
912 }
913 }
914 }
915
916 error:
917 DBG("Kernel thread dying");
918 close(kernel_poll_pipe[0]);
919 close(kernel_poll_pipe[1]);
920
921 lttng_poll_clean(&events);
922
923 return NULL;
924 }
925
926 /*
927 * This thread manage the consumer error sent back to the session daemon.
928 */
929 static void *thread_manage_consumer(void *data)
930 {
931 int sock = 0, i, ret, pollfd;
932 uint32_t revents, nb_fd;
933 enum lttcomm_return_code code;
934 struct lttng_poll_event events;
935 struct consumer_data *consumer_data = data;
936
937 DBG("[thread] Manage consumer started");
938
939 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
940 if (ret < 0) {
941 goto error;
942 }
943
944 /*
945 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
946 * Nothing more will be added to this poll set.
947 */
948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
952
953 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
954 if (ret < 0) {
955 goto error;
956 }
957
958 nb_fd = LTTNG_POLL_GETNB(&events);
959
960 /* Inifinite blocking call, waiting for transmission */
961 ret = lttng_poll_wait(&events, -1);
962 if (ret < 0) {
963 goto error;
964 }
965
966 for (i = 0; i < nb_fd; i++) {
967 /* Fetch once the poll data */
968 revents = LTTNG_POLL_GETEV(&events, i);
969 pollfd = LTTNG_POLL_GETFD(&events, i);
970
971 /* Thread quit pipe has been closed. Killing thread. */
972 ret = check_thread_quit_pipe(pollfd, revents);
973 if (ret) {
974 goto error;
975 }
976
977 /* Event on the registration socket */
978 if (pollfd == consumer_data->err_sock) {
979 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
980 ERR("consumer err socket poll error");
981 goto error;
982 }
983 }
984 }
985
986 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
987 if (sock < 0) {
988 goto error;
989 }
990
991 DBG2("Receiving code from consumer err_sock");
992
993 /* Getting status code from kconsumerd */
994 ret = lttcomm_recv_unix_sock(sock, &code,
995 sizeof(enum lttcomm_return_code));
996 if (ret <= 0) {
997 goto error;
998 }
999
1000 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1001 consumer_data->cmd_sock =
1002 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1003 if (consumer_data->cmd_sock < 0) {
1004 sem_post(&consumer_data->sem);
1005 PERROR("consumer connect");
1006 goto error;
1007 }
1008 /* Signal condition to tell that the kconsumerd is ready */
1009 sem_post(&consumer_data->sem);
1010 DBG("consumer command socket ready");
1011 } else {
1012 ERR("consumer error when waiting for SOCK_READY : %s",
1013 lttcomm_get_readable_code(-code));
1014 goto error;
1015 }
1016
1017 /* Remove the kconsumerd error sock since we've established a connexion */
1018 ret = lttng_poll_del(&events, consumer_data->err_sock);
1019 if (ret < 0) {
1020 goto error;
1021 }
1022
1023 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1024 if (ret < 0) {
1025 goto error;
1026 }
1027
1028 /* Update number of fd */
1029 nb_fd = LTTNG_POLL_GETNB(&events);
1030
1031 /* Inifinite blocking call, waiting for transmission */
1032 ret = lttng_poll_wait(&events, -1);
1033 if (ret < 0) {
1034 goto error;
1035 }
1036
1037 for (i = 0; i < nb_fd; i++) {
1038 /* Fetch once the poll data */
1039 revents = LTTNG_POLL_GETEV(&events, i);
1040 pollfd = LTTNG_POLL_GETFD(&events, i);
1041
1042 /* Thread quit pipe has been closed. Killing thread. */
1043 ret = check_thread_quit_pipe(pollfd, revents);
1044 if (ret) {
1045 goto error;
1046 }
1047
1048 /* Event on the kconsumerd socket */
1049 if (pollfd == sock) {
1050 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1051 ERR("consumer err socket second poll error");
1052 goto error;
1053 }
1054 }
1055 }
1056
1057 /* Wait for any kconsumerd error */
1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
1060 if (ret <= 0) {
1061 ERR("consumer closed the command socket");
1062 goto error;
1063 }
1064
1065 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1066
1067 error:
1068 DBG("consumer thread dying");
1069 close(consumer_data->err_sock);
1070 close(consumer_data->cmd_sock);
1071 close(sock);
1072
1073 unlink(consumer_data->err_unix_sock_path);
1074 unlink(consumer_data->cmd_unix_sock_path);
1075 consumer_data->pid = 0;
1076
1077 lttng_poll_clean(&events);
1078
1079 return NULL;
1080 }
1081
1082 /*
1083 * This thread manage application communication.
1084 */
1085 static void *thread_manage_apps(void *data)
1086 {
1087 int i, ret, pollfd;
1088 uint32_t revents, nb_fd;
1089 struct ust_command ust_cmd;
1090 struct lttng_poll_event events;
1091
1092 DBG("[thread] Manage application started");
1093
1094 rcu_register_thread();
1095 rcu_thread_online();
1096
1097 ret = create_thread_poll_set(&events, 2);
1098 if (ret < 0) {
1099 goto error;
1100 }
1101
1102 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1103 if (ret < 0) {
1104 goto error;
1105 }
1106
1107 while (1) {
1108 /* Zeroed the events structure */
1109 lttng_poll_reset(&events);
1110
1111 nb_fd = LTTNG_POLL_GETNB(&events);
1112
1113 DBG("Apps thread polling on %d fds", nb_fd);
1114
1115 /* Inifinite blocking call, waiting for transmission */
1116 ret = lttng_poll_wait(&events, -1);
1117 if (ret < 0) {
1118 goto error;
1119 }
1120
1121 for (i = 0; i < nb_fd; i++) {
1122 /* Fetch once the poll data */
1123 revents = LTTNG_POLL_GETEV(&events, i);
1124 pollfd = LTTNG_POLL_GETFD(&events, i);
1125
1126 /* Thread quit pipe has been closed. Killing thread. */
1127 ret = check_thread_quit_pipe(pollfd, revents);
1128 if (ret) {
1129 goto error;
1130 }
1131
1132 /* Inspect the apps cmd pipe */
1133 if (pollfd == apps_cmd_pipe[0]) {
1134 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1135 ERR("Apps command pipe error");
1136 goto error;
1137 } else if (revents & LPOLLIN) {
1138 /* Empty pipe */
1139 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1140 if (ret < 0 || ret < sizeof(ust_cmd)) {
1141 perror("read apps cmd pipe");
1142 goto error;
1143 }
1144
1145 /* Register applicaton to the session daemon */
1146 ret = ust_app_register(&ust_cmd.reg_msg,
1147 ust_cmd.sock);
1148 if (ret == -ENOMEM) {
1149 goto error;
1150 } else if (ret < 0) {
1151 break;
1152 }
1153
1154 /*
1155 * Add channel(s) and event(s) to newly registered apps
1156 * from lttng global UST domain.
1157 */
1158 update_ust_app(ust_cmd.sock);
1159
1160 ret = ustctl_register_done(ust_cmd.sock);
1161 if (ret < 0) {
1162 /*
1163 * If the registration is not possible, we simply
1164 * unregister the apps and continue
1165 */
1166 ust_app_unregister(ust_cmd.sock);
1167 } else {
1168 /*
1169 * We just need here to monitor the close of the UST
1170 * socket and poll set monitor those by default.
1171 */
1172 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1173 if (ret < 0) {
1174 goto error;
1175 }
1176
1177 DBG("Apps with sock %d added to poll set",
1178 ust_cmd.sock);
1179 }
1180
1181 break;
1182 }
1183 } else {
1184 /*
1185 * At this point, we know that a registered application made
1186 * the event at poll_wait.
1187 */
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 /* Removing from the poll set */
1190 ret = lttng_poll_del(&events, pollfd);
1191 if (ret < 0) {
1192 goto error;
1193 }
1194
1195 /* Socket closed on remote end. */
1196 ust_app_unregister(pollfd);
1197 break;
1198 }
1199 }
1200 }
1201 }
1202
1203 error:
1204 DBG("Application communication apps dying");
1205 close(apps_cmd_pipe[0]);
1206 close(apps_cmd_pipe[1]);
1207
1208 lttng_poll_clean(&events);
1209
1210 rcu_thread_offline();
1211 rcu_unregister_thread();
1212 return NULL;
1213 }
1214
1215 /*
1216 * Dispatch request from the registration threads to the application
1217 * communication thread.
1218 */
1219 static void *thread_dispatch_ust_registration(void *data)
1220 {
1221 int ret;
1222 struct cds_wfq_node *node;
1223 struct ust_command *ust_cmd = NULL;
1224
1225 DBG("[thread] Dispatch UST command started");
1226
1227 while (!dispatch_thread_exit) {
1228 /* Atomically prepare the queue futex */
1229 futex_nto1_prepare(&ust_cmd_queue.futex);
1230
1231 do {
1232 /* Dequeue command for registration */
1233 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1234 if (node == NULL) {
1235 DBG("Woken up but nothing in the UST command queue");
1236 /* Continue thread execution */
1237 break;
1238 }
1239
1240 ust_cmd = caa_container_of(node, struct ust_command, node);
1241
1242 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1243 " gid:%d sock:%d name:%s (version %d.%d)",
1244 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1245 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1246 ust_cmd->sock, ust_cmd->reg_msg.name,
1247 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1248 /*
1249 * Inform apps thread of the new application registration. This
1250 * call is blocking so we can be assured that the data will be read
1251 * at some point in time or wait to the end of the world :)
1252 */
1253 ret = write(apps_cmd_pipe[1], ust_cmd,
1254 sizeof(struct ust_command));
1255 if (ret < 0) {
1256 perror("write apps cmd pipe");
1257 if (errno == EBADF) {
1258 /*
1259 * We can't inform the application thread to process
1260 * registration. We will exit or else application
1261 * registration will not occur and tracing will never
1262 * start.
1263 */
1264 goto error;
1265 }
1266 }
1267 free(ust_cmd);
1268 } while (node != NULL);
1269
1270 /* Futex wait on queue. Blocking call on futex() */
1271 futex_nto1_wait(&ust_cmd_queue.futex);
1272 }
1273
1274 error:
1275 DBG("Dispatch thread dying");
1276 return NULL;
1277 }
1278
1279 /*
1280 * This thread manage application registration.
1281 */
1282 static void *thread_registration_apps(void *data)
1283 {
1284 int sock = 0, i, ret, pollfd;
1285 uint32_t revents, nb_fd;
1286 struct lttng_poll_event events;
1287 /*
1288 * Get allocated in this thread, enqueued to a global queue, dequeued and
1289 * freed in the manage apps thread.
1290 */
1291 struct ust_command *ust_cmd = NULL;
1292
1293 DBG("[thread] Manage application registration started");
1294
1295 ret = lttcomm_listen_unix_sock(apps_sock);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
1300 /*
1301 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1302 * more will be added to this poll set.
1303 */
1304 ret = create_thread_poll_set(&events, 2);
1305 if (ret < 0) {
1306 goto error;
1307 }
1308
1309 /* Add the application registration socket */
1310 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1311 if (ret < 0) {
1312 goto error;
1313 }
1314
1315 /* Notify all applications to register */
1316 ret = notify_ust_apps(1);
1317 if (ret < 0) {
1318 ERR("Failed to notify applications or create the wait shared memory.\n"
1319 "Execution continues but there might be problem for already\n"
1320 "running applications that wishes to register.");
1321 }
1322
1323 while (1) {
1324 DBG("Accepting application registration");
1325
1326 nb_fd = LTTNG_POLL_GETNB(&events);
1327
1328 /* Inifinite blocking call, waiting for transmission */
1329 ret = lttng_poll_wait(&events, -1);
1330 if (ret < 0) {
1331 goto error;
1332 }
1333
1334 for (i = 0; i < nb_fd; i++) {
1335 /* Fetch once the poll data */
1336 revents = LTTNG_POLL_GETEV(&events, i);
1337 pollfd = LTTNG_POLL_GETFD(&events, i);
1338
1339 /* Thread quit pipe has been closed. Killing thread. */
1340 ret = check_thread_quit_pipe(pollfd, revents);
1341 if (ret) {
1342 goto error;
1343 }
1344
1345 /* Event on the registration socket */
1346 if (pollfd == apps_sock) {
1347 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1348 ERR("Register apps socket poll error");
1349 goto error;
1350 } else if (revents & LPOLLIN) {
1351 sock = lttcomm_accept_unix_sock(apps_sock);
1352 if (sock < 0) {
1353 goto error;
1354 }
1355
1356 /* Create UST registration command for enqueuing */
1357 ust_cmd = zmalloc(sizeof(struct ust_command));
1358 if (ust_cmd == NULL) {
1359 perror("ust command zmalloc");
1360 goto error;
1361 }
1362
1363 /*
1364 * Using message-based transmissions to ensure we don't
1365 * have to deal with partially received messages.
1366 */
1367 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1368 sizeof(struct ust_register_msg));
1369 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1370 if (ret < 0) {
1371 perror("lttcomm_recv_unix_sock register apps");
1372 } else {
1373 ERR("Wrong size received on apps register");
1374 }
1375 free(ust_cmd);
1376 close(sock);
1377 continue;
1378 }
1379
1380 ust_cmd->sock = sock;
1381
1382 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1383 " gid:%d sock:%d name:%s (version %d.%d)",
1384 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1385 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1386 ust_cmd->sock, ust_cmd->reg_msg.name,
1387 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1388
1389 /*
1390 * Lock free enqueue the registration request. The red pill
1391 * has been taken! This apps will be part of the *system*.
1392 */
1393 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1394
1395 /*
1396 * Wake the registration queue futex. Implicit memory
1397 * barrier with the exchange in cds_wfq_enqueue.
1398 */
1399 futex_nto1_wake(&ust_cmd_queue.futex);
1400 }
1401 }
1402 }
1403 }
1404
1405 error:
1406 DBG("UST Registration thread dying");
1407
1408 /* Notify that the registration thread is gone */
1409 notify_ust_apps(0);
1410
1411 close(apps_sock);
1412 close(sock);
1413 unlink(apps_unix_sock_path);
1414
1415 lttng_poll_clean(&events);
1416
1417 return NULL;
1418 }
1419
1420 /*
1421 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1422 * exec or it will fails.
1423 */
1424 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1425 {
1426 int ret;
1427 struct timespec timeout;
1428
1429 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1430 timeout.tv_nsec = 0;
1431
1432 /* Setup semaphore */
1433 ret = sem_init(&consumer_data->sem, 0, 0);
1434 if (ret < 0) {
1435 PERROR("sem_init consumer semaphore");
1436 goto error;
1437 }
1438
1439 ret = pthread_create(&consumer_data->thread, NULL,
1440 thread_manage_consumer, consumer_data);
1441 if (ret != 0) {
1442 PERROR("pthread_create consumer");
1443 ret = -1;
1444 goto error;
1445 }
1446
1447 /* Get time for sem_timedwait absolute timeout */
1448 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1449 if (ret < 0) {
1450 PERROR("clock_gettime spawn consumer");
1451 /* Infinite wait for the kconsumerd thread to be ready */
1452 ret = sem_wait(&consumer_data->sem);
1453 } else {
1454 /* Normal timeout if the gettime was successful */
1455 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1456 ret = sem_timedwait(&consumer_data->sem, &timeout);
1457 }
1458
1459 if (ret < 0) {
1460 if (errno == ETIMEDOUT) {
1461 /*
1462 * Call has timed out so we kill the kconsumerd_thread and return
1463 * an error.
1464 */
1465 ERR("The consumer thread was never ready. Killing it");
1466 ret = pthread_cancel(consumer_data->thread);
1467 if (ret < 0) {
1468 PERROR("pthread_cancel consumer thread");
1469 }
1470 } else {
1471 PERROR("semaphore wait failed consumer thread");
1472 }
1473 goto error;
1474 }
1475
1476 pthread_mutex_lock(&consumer_data->pid_mutex);
1477 if (consumer_data->pid == 0) {
1478 ERR("Kconsumerd did not start");
1479 pthread_mutex_unlock(&consumer_data->pid_mutex);
1480 goto error;
1481 }
1482 pthread_mutex_unlock(&consumer_data->pid_mutex);
1483
1484 return 0;
1485
1486 error:
1487 return ret;
1488 }
1489
1490 /*
1491 * Join consumer thread
1492 */
1493 static int join_consumer_thread(struct consumer_data *consumer_data)
1494 {
1495 void *status;
1496 int ret;
1497
1498 if (consumer_data->pid != 0) {
1499 ret = kill(consumer_data->pid, SIGTERM);
1500 if (ret) {
1501 ERR("Error killing consumer daemon");
1502 return ret;
1503 }
1504 return pthread_join(consumer_data->thread, &status);
1505 } else {
1506 return 0;
1507 }
1508 }
1509
1510 /*
1511 * Fork and exec a consumer daemon (consumerd).
1512 *
1513 * Return pid if successful else -1.
1514 */
1515 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1516 {
1517 int ret;
1518 pid_t pid;
1519 const char *consumer_to_use;
1520 const char *verbosity;
1521 struct stat st;
1522
1523 DBG("Spawning consumerd");
1524
1525 pid = fork();
1526 if (pid == 0) {
1527 /*
1528 * Exec consumerd.
1529 */
1530 if (opt_verbose > 1 || opt_verbose_consumer) {
1531 verbosity = "--verbose";
1532 } else {
1533 verbosity = "--quiet";
1534 }
1535 switch (consumer_data->type) {
1536 case LTTNG_CONSUMER_KERNEL:
1537 /*
1538 * Find out which consumerd to execute. We will
1539 * first try the 64-bit path, then the
1540 * sessiond's installation directory, and
1541 * fallback on the 32-bit one,
1542 */
1543 if (stat(consumerd64_bin, &st) == 0) {
1544 consumer_to_use = consumerd64_bin;
1545 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1546 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1547 } else if (stat(consumerd32_bin, &st) == 0) {
1548 consumer_to_use = consumerd32_bin;
1549 } else {
1550 break;
1551 }
1552 DBG("Using kernel consumer at: %s", consumer_to_use);
1553 execl(consumer_to_use,
1554 "lttng-consumerd", verbosity, "-k",
1555 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1556 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1557 NULL);
1558 break;
1559 case LTTNG_CONSUMER64_UST:
1560 {
1561 char *tmpnew = NULL;
1562
1563 if (consumerd64_libdir[0] != '\0') {
1564 char *tmp;
1565 size_t tmplen;
1566
1567 tmp = getenv("LD_LIBRARY_PATH");
1568 if (!tmp) {
1569 tmp = "";
1570 }
1571 tmplen = strlen("LD_LIBRARY_PATH=")
1572 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1573 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1574 if (!tmpnew) {
1575 ret = -ENOMEM;
1576 goto error;
1577 }
1578 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1579 strcat(tmpnew, consumerd64_libdir);
1580 if (tmp[0] != '\0') {
1581 strcat(tmpnew, ":");
1582 strcat(tmpnew, tmp);
1583 }
1584 ret = putenv(tmpnew);
1585 if (ret) {
1586 ret = -errno;
1587 goto error;
1588 }
1589 }
1590 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1591 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1592 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1593 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1594 NULL);
1595 if (consumerd64_libdir[0] != '\0') {
1596 free(tmpnew);
1597 }
1598 if (ret) {
1599 goto error;
1600 }
1601 break;
1602 }
1603 case LTTNG_CONSUMER32_UST:
1604 {
1605 char *tmpnew = NULL;
1606
1607 if (consumerd32_libdir[0] != '\0') {
1608 char *tmp;
1609 size_t tmplen;
1610
1611 tmp = getenv("LD_LIBRARY_PATH");
1612 if (!tmp) {
1613 tmp = "";
1614 }
1615 tmplen = strlen("LD_LIBRARY_PATH=")
1616 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1617 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1618 if (!tmpnew) {
1619 ret = -ENOMEM;
1620 goto error;
1621 }
1622 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1623 strcat(tmpnew, consumerd32_libdir);
1624 if (tmp[0] != '\0') {
1625 strcat(tmpnew, ":");
1626 strcat(tmpnew, tmp);
1627 }
1628 ret = putenv(tmpnew);
1629 if (ret) {
1630 ret = -errno;
1631 goto error;
1632 }
1633 }
1634 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1635 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1636 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1637 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1638 NULL);
1639 if (consumerd32_libdir[0] != '\0') {
1640 free(tmpnew);
1641 }
1642 if (ret) {
1643 goto error;
1644 }
1645 break;
1646 }
1647 default:
1648 perror("unknown consumer type");
1649 exit(EXIT_FAILURE);
1650 }
1651 if (errno != 0) {
1652 perror("kernel start consumer exec");
1653 }
1654 exit(EXIT_FAILURE);
1655 } else if (pid > 0) {
1656 ret = pid;
1657 } else {
1658 perror("start consumer fork");
1659 ret = -errno;
1660 }
1661 error:
1662 return ret;
1663 }
1664
1665 /*
1666 * Spawn the consumerd daemon and session daemon thread.
1667 */
1668 static int start_consumerd(struct consumer_data *consumer_data)
1669 {
1670 int ret;
1671
1672 pthread_mutex_lock(&consumer_data->pid_mutex);
1673 if (consumer_data->pid != 0) {
1674 pthread_mutex_unlock(&consumer_data->pid_mutex);
1675 goto end;
1676 }
1677
1678 ret = spawn_consumerd(consumer_data);
1679 if (ret < 0) {
1680 ERR("Spawning consumerd failed");
1681 pthread_mutex_unlock(&consumer_data->pid_mutex);
1682 goto error;
1683 }
1684
1685 /* Setting up the consumer_data pid */
1686 consumer_data->pid = ret;
1687 DBG2("Consumer pid %d", consumer_data->pid);
1688 pthread_mutex_unlock(&consumer_data->pid_mutex);
1689
1690 DBG2("Spawning consumer control thread");
1691 ret = spawn_consumer_thread(consumer_data);
1692 if (ret < 0) {
1693 ERR("Fatal error spawning consumer control thread");
1694 goto error;
1695 }
1696
1697 end:
1698 return 0;
1699
1700 error:
1701 return ret;
1702 }
1703
1704 /*
1705 * modprobe_kernel_modules
1706 */
1707 static int modprobe_kernel_modules(void)
1708 {
1709 int ret = 0, i;
1710 char modprobe[256];
1711
1712 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1713 ret = snprintf(modprobe, sizeof(modprobe),
1714 "/sbin/modprobe %s%s",
1715 kernel_modules_list[i].required ? "" : "-q ",
1716 kernel_modules_list[i].name);
1717 if (ret < 0) {
1718 perror("snprintf modprobe");
1719 goto error;
1720 }
1721 modprobe[sizeof(modprobe) - 1] = '\0';
1722 ret = system(modprobe);
1723 if (ret == -1) {
1724 ERR("Unable to launch modprobe for module %s",
1725 kernel_modules_list[i].name);
1726 } else if (kernel_modules_list[i].required
1727 && WEXITSTATUS(ret) != 0) {
1728 ERR("Unable to load module %s",
1729 kernel_modules_list[i].name);
1730 } else {
1731 DBG("Modprobe successfully %s",
1732 kernel_modules_list[i].name);
1733 }
1734 }
1735
1736 error:
1737 return ret;
1738 }
1739
1740 /*
1741 * mount_debugfs
1742 */
1743 static int mount_debugfs(char *path)
1744 {
1745 int ret;
1746 char *type = "debugfs";
1747
1748 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1749 if (ret < 0) {
1750 PERROR("Cannot create debugfs path");
1751 goto error;
1752 }
1753
1754 ret = mount(type, path, type, 0, NULL);
1755 if (ret < 0) {
1756 PERROR("Cannot mount debugfs");
1757 goto error;
1758 }
1759
1760 DBG("Mounted debugfs successfully at %s", path);
1761
1762 error:
1763 return ret;
1764 }
1765
1766 /*
1767 * Setup necessary data for kernel tracer action.
1768 */
1769 static void init_kernel_tracer(void)
1770 {
1771 int ret;
1772 char *proc_mounts = "/proc/mounts";
1773 char line[256];
1774 char *debugfs_path = NULL, *lttng_path = NULL;
1775 FILE *fp;
1776
1777 /* Detect debugfs */
1778 fp = fopen(proc_mounts, "r");
1779 if (fp == NULL) {
1780 ERR("Unable to probe %s", proc_mounts);
1781 goto error;
1782 }
1783
1784 while (fgets(line, sizeof(line), fp) != NULL) {
1785 if (strstr(line, "debugfs") != NULL) {
1786 /* Remove first string */
1787 strtok(line, " ");
1788 /* Dup string here so we can reuse line later on */
1789 debugfs_path = strdup(strtok(NULL, " "));
1790 DBG("Got debugfs path : %s", debugfs_path);
1791 break;
1792 }
1793 }
1794
1795 fclose(fp);
1796
1797 /* Mount debugfs if needded */
1798 if (debugfs_path == NULL) {
1799 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1800 if (ret < 0) {
1801 perror("asprintf debugfs path");
1802 goto error;
1803 }
1804 ret = mount_debugfs(debugfs_path);
1805 if (ret < 0) {
1806 perror("Cannot mount debugfs");
1807 goto error;
1808 }
1809 }
1810
1811 /* Modprobe lttng kernel modules */
1812 ret = modprobe_kernel_modules();
1813 if (ret < 0) {
1814 goto error;
1815 }
1816
1817 /* Setup lttng kernel path */
1818 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1819 if (ret < 0) {
1820 perror("asprintf lttng path");
1821 goto error;
1822 }
1823
1824 /* Open debugfs lttng */
1825 kernel_tracer_fd = open(lttng_path, O_RDWR);
1826 if (kernel_tracer_fd < 0) {
1827 DBG("Failed to open %s", lttng_path);
1828 goto error;
1829 }
1830
1831 free(lttng_path);
1832 free(debugfs_path);
1833 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1834 return;
1835
1836 error:
1837 if (lttng_path) {
1838 free(lttng_path);
1839 }
1840 if (debugfs_path) {
1841 free(debugfs_path);
1842 }
1843 WARN("No kernel tracer available");
1844 kernel_tracer_fd = 0;
1845 return;
1846 }
1847
1848 /*
1849 * Init tracing by creating trace directory and sending fds kernel consumer.
1850 */
1851 static int init_kernel_tracing(struct ltt_kernel_session *session)
1852 {
1853 int ret = 0;
1854
1855 if (session->consumer_fds_sent == 0) {
1856 /*
1857 * Assign default kernel consumer socket if no consumer assigned to the
1858 * kernel session. At this point, it's NOT suppose to be 0 but this is
1859 * an extra security check.
1860 */
1861 if (session->consumer_fd == 0) {
1862 session->consumer_fd = kconsumer_data.cmd_sock;
1863 }
1864
1865 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1866 if (ret < 0) {
1867 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1868 goto error;
1869 }
1870
1871 session->consumer_fds_sent = 1;
1872 }
1873
1874 error:
1875 return ret;
1876 }
1877
1878 /*
1879 * Create an UST session and add it to the session ust list.
1880 */
1881 static int create_ust_session(struct ltt_session *session,
1882 struct lttng_domain *domain)
1883 {
1884 struct ltt_ust_session *lus = NULL;
1885 int ret;
1886
1887 switch (domain->type) {
1888 case LTTNG_DOMAIN_UST:
1889 break;
1890 default:
1891 ret = LTTCOMM_UNKNOWN_DOMAIN;
1892 goto error;
1893 }
1894
1895 DBG("Creating UST session");
1896
1897 lus = trace_ust_create_session(session->path, session->id, domain);
1898 if (lus == NULL) {
1899 ret = LTTCOMM_UST_SESS_FAIL;
1900 goto error;
1901 }
1902
1903 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
1904 session->uid, session->gid);
1905 if (ret < 0) {
1906 if (ret != -EEXIST) {
1907 ERR("Trace directory creation error");
1908 ret = LTTCOMM_UST_SESS_FAIL;
1909 goto error;
1910 }
1911 }
1912
1913 /* The domain type dictate different actions on session creation */
1914 switch (domain->type) {
1915 case LTTNG_DOMAIN_UST:
1916 /* No ustctl for the global UST domain */
1917 break;
1918 default:
1919 ERR("Unknown UST domain on create session %d", domain->type);
1920 goto error;
1921 }
1922 lus->uid = session->uid;
1923 lus->gid = session->gid;
1924 session->ust_session = lus;
1925
1926 return LTTCOMM_OK;
1927
1928 error:
1929 free(lus);
1930 return ret;
1931 }
1932
1933 /*
1934 * Create a kernel tracer session then create the default channel.
1935 */
1936 static int create_kernel_session(struct ltt_session *session)
1937 {
1938 int ret;
1939
1940 DBG("Creating kernel session");
1941
1942 ret = kernel_create_session(session, kernel_tracer_fd);
1943 if (ret < 0) {
1944 ret = LTTCOMM_KERN_SESS_FAIL;
1945 goto error;
1946 }
1947
1948 /* Set kernel consumer socket fd */
1949 if (kconsumer_data.cmd_sock) {
1950 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1951 }
1952
1953 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
1954 S_IRWXU | S_IRWXG, session->uid, session->gid);
1955 if (ret < 0) {
1956 if (ret != -EEXIST) {
1957 ERR("Trace directory creation error");
1958 goto error;
1959 }
1960 }
1961 session->kernel_session->uid = session->uid;
1962 session->kernel_session->gid = session->gid;
1963
1964 error:
1965 return ret;
1966 }
1967
1968 /*
1969 * Using the session list, filled a lttng_session array to send back to the
1970 * client for session listing.
1971 *
1972 * The session list lock MUST be acquired before calling this function. Use
1973 * session_lock_list() and session_unlock_list().
1974 */
1975 static void list_lttng_sessions(struct lttng_session *sessions)
1976 {
1977 int i = 0;
1978 struct ltt_session *session;
1979
1980 DBG("Getting all available session");
1981 /*
1982 * Iterate over session list and append data after the control struct in
1983 * the buffer.
1984 */
1985 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1986 strncpy(sessions[i].path, session->path, PATH_MAX);
1987 sessions[i].path[PATH_MAX - 1] = '\0';
1988 strncpy(sessions[i].name, session->name, NAME_MAX);
1989 sessions[i].name[NAME_MAX - 1] = '\0';
1990 sessions[i].enabled = session->enabled;
1991 i++;
1992 }
1993 }
1994
1995 /*
1996 * Fill lttng_channel array of all channels.
1997 */
1998 static void list_lttng_channels(int domain, struct ltt_session *session,
1999 struct lttng_channel *channels)
2000 {
2001 int i = 0;
2002 struct ltt_kernel_channel *kchan;
2003
2004 DBG("Listing channels for session %s", session->name);
2005
2006 switch (domain) {
2007 case LTTNG_DOMAIN_KERNEL:
2008 /* Kernel channels */
2009 if (session->kernel_session != NULL) {
2010 cds_list_for_each_entry(kchan,
2011 &session->kernel_session->channel_list.head, list) {
2012 /* Copy lttng_channel struct to array */
2013 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2014 channels[i].enabled = kchan->enabled;
2015 i++;
2016 }
2017 }
2018 break;
2019 case LTTNG_DOMAIN_UST:
2020 {
2021 struct cds_lfht_iter iter;
2022 struct ltt_ust_channel *uchan;
2023
2024 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2025 &iter, uchan, node) {
2026 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2027 channels[i].attr.overwrite = uchan->attr.overwrite;
2028 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2029 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2030 channels[i].attr.switch_timer_interval =
2031 uchan->attr.switch_timer_interval;
2032 channels[i].attr.read_timer_interval =
2033 uchan->attr.read_timer_interval;
2034 channels[i].enabled = uchan->enabled;
2035 switch (uchan->attr.output) {
2036 case LTTNG_UST_MMAP:
2037 default:
2038 channels[i].attr.output = LTTNG_EVENT_MMAP;
2039 break;
2040 }
2041 i++;
2042 }
2043 break;
2044 }
2045 default:
2046 break;
2047 }
2048 }
2049
2050 /*
2051 * Create a list of ust global domain events.
2052 */
2053 static int list_lttng_ust_global_events(char *channel_name,
2054 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2055 {
2056 int i = 0, ret = 0;
2057 unsigned int nb_event = 0;
2058 struct cds_lfht_iter iter;
2059 struct cds_lfht_node *node;
2060 struct ltt_ust_channel *uchan;
2061 struct ltt_ust_event *uevent;
2062 struct lttng_event *tmp;
2063
2064 DBG("Listing UST global events for channel %s", channel_name);
2065
2066 rcu_read_lock();
2067
2068 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2069 strlen(channel_name), &iter);
2070 if (node == NULL) {
2071 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2072 goto error;
2073 }
2074
2075 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2076
2077 nb_event += hashtable_get_count(uchan->events);
2078
2079 if (nb_event == 0) {
2080 ret = nb_event;
2081 goto error;
2082 }
2083
2084 DBG3("Listing UST global %d events", nb_event);
2085
2086 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2087 if (tmp == NULL) {
2088 ret = -LTTCOMM_FATAL;
2089 goto error;
2090 }
2091
2092 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2093 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2094 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2095 tmp[i].enabled = uevent->enabled;
2096 switch (uevent->attr.instrumentation) {
2097 case LTTNG_UST_TRACEPOINT:
2098 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2099 break;
2100 case LTTNG_UST_PROBE:
2101 tmp[i].type = LTTNG_EVENT_PROBE;
2102 break;
2103 case LTTNG_UST_FUNCTION:
2104 tmp[i].type = LTTNG_EVENT_FUNCTION;
2105 break;
2106 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2107 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2108 break;
2109 }
2110 i++;
2111 }
2112
2113 ret = nb_event;
2114 *events = tmp;
2115
2116 error:
2117 rcu_read_unlock();
2118 return ret;
2119 }
2120
2121 /*
2122 * Fill lttng_event array of all kernel events in the channel.
2123 */
2124 static int list_lttng_kernel_events(char *channel_name,
2125 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2126 {
2127 int i = 0, ret;
2128 unsigned int nb_event;
2129 struct ltt_kernel_event *event;
2130 struct ltt_kernel_channel *kchan;
2131
2132 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2133 if (kchan == NULL) {
2134 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2135 goto error;
2136 }
2137
2138 nb_event = kchan->event_count;
2139
2140 DBG("Listing events for channel %s", kchan->channel->name);
2141
2142 if (nb_event == 0) {
2143 ret = nb_event;
2144 goto error;
2145 }
2146
2147 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2148 if (*events == NULL) {
2149 ret = LTTCOMM_FATAL;
2150 goto error;
2151 }
2152
2153 /* Kernel channels */
2154 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2155 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2156 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2157 (*events)[i].enabled = event->enabled;
2158 switch (event->event->instrumentation) {
2159 case LTTNG_KERNEL_TRACEPOINT:
2160 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2161 break;
2162 case LTTNG_KERNEL_KPROBE:
2163 case LTTNG_KERNEL_KRETPROBE:
2164 (*events)[i].type = LTTNG_EVENT_PROBE;
2165 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2166 sizeof(struct lttng_kernel_kprobe));
2167 break;
2168 case LTTNG_KERNEL_FUNCTION:
2169 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2170 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2171 sizeof(struct lttng_kernel_function));
2172 break;
2173 case LTTNG_KERNEL_NOOP:
2174 (*events)[i].type = LTTNG_EVENT_NOOP;
2175 break;
2176 case LTTNG_KERNEL_SYSCALL:
2177 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2178 break;
2179 case LTTNG_KERNEL_ALL:
2180 assert(0);
2181 break;
2182 }
2183 i++;
2184 }
2185
2186 return nb_event;
2187
2188 error:
2189 return ret;
2190 }
2191
2192 /*
2193 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2194 */
2195 static int cmd_disable_channel(struct ltt_session *session,
2196 int domain, char *channel_name)
2197 {
2198 int ret;
2199 struct ltt_ust_session *usess;
2200
2201 usess = session->ust_session;
2202
2203 switch (domain) {
2204 case LTTNG_DOMAIN_KERNEL:
2205 {
2206 ret = channel_kernel_disable(session->kernel_session,
2207 channel_name);
2208 if (ret != LTTCOMM_OK) {
2209 goto error;
2210 }
2211
2212 kernel_wait_quiescent(kernel_tracer_fd);
2213 break;
2214 }
2215 case LTTNG_DOMAIN_UST:
2216 {
2217 struct ltt_ust_channel *uchan;
2218 struct cds_lfht *chan_ht;
2219
2220 chan_ht = usess->domain_global.channels;
2221
2222 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2223 if (uchan == NULL) {
2224 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2225 goto error;
2226 }
2227
2228 ret = channel_ust_disable(usess, domain, uchan);
2229 if (ret != LTTCOMM_OK) {
2230 goto error;
2231 }
2232 break;
2233 }
2234 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2235 case LTTNG_DOMAIN_UST_EXEC_NAME:
2236 case LTTNG_DOMAIN_UST_PID:
2237 ret = LTTCOMM_NOT_IMPLEMENTED;
2238 goto error;
2239 default:
2240 ret = LTTCOMM_UNKNOWN_DOMAIN;
2241 goto error;
2242 }
2243
2244 ret = LTTCOMM_OK;
2245
2246 error:
2247 return ret;
2248 }
2249
2250 /*
2251 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2252 */
2253 static int cmd_enable_channel(struct ltt_session *session,
2254 int domain, struct lttng_channel *attr)
2255 {
2256 int ret;
2257 struct ltt_ust_session *usess = session->ust_session;
2258 struct cds_lfht *chan_ht;
2259
2260 DBG("Enabling channel %s for session %s", attr->name, session->name);
2261
2262 switch (domain) {
2263 case LTTNG_DOMAIN_KERNEL:
2264 {
2265 struct ltt_kernel_channel *kchan;
2266
2267 kchan = trace_kernel_get_channel_by_name(attr->name,
2268 session->kernel_session);
2269 if (kchan == NULL) {
2270 ret = channel_kernel_create(session->kernel_session,
2271 attr, kernel_poll_pipe[1]);
2272 } else {
2273 ret = channel_kernel_enable(session->kernel_session, kchan);
2274 }
2275
2276 if (ret != LTTCOMM_OK) {
2277 goto error;
2278 }
2279
2280 kernel_wait_quiescent(kernel_tracer_fd);
2281 break;
2282 }
2283 case LTTNG_DOMAIN_UST:
2284 {
2285 struct ltt_ust_channel *uchan;
2286
2287 chan_ht = usess->domain_global.channels;
2288
2289 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2290 if (uchan == NULL) {
2291 ret = channel_ust_create(usess, domain, attr);
2292 } else {
2293 ret = channel_ust_enable(usess, domain, uchan);
2294 }
2295 break;
2296 }
2297 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2298 case LTTNG_DOMAIN_UST_EXEC_NAME:
2299 case LTTNG_DOMAIN_UST_PID:
2300 ret = LTTCOMM_NOT_IMPLEMENTED;
2301 goto error;
2302 default:
2303 ret = LTTCOMM_UNKNOWN_DOMAIN;
2304 goto error;
2305 }
2306
2307 error:
2308 return ret;
2309 }
2310
2311 /*
2312 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2313 */
2314 static int cmd_disable_event(struct ltt_session *session, int domain,
2315 char *channel_name, char *event_name)
2316 {
2317 int ret;
2318
2319 switch (domain) {
2320 case LTTNG_DOMAIN_KERNEL:
2321 {
2322 struct ltt_kernel_channel *kchan;
2323 struct ltt_kernel_session *ksess;
2324
2325 ksess = session->kernel_session;
2326
2327 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2328 if (kchan == NULL) {
2329 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2330 goto error;
2331 }
2332
2333 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2334 if (ret != LTTCOMM_OK) {
2335 goto error;
2336 }
2337
2338 kernel_wait_quiescent(kernel_tracer_fd);
2339 break;
2340 }
2341 case LTTNG_DOMAIN_UST:
2342 {
2343 struct ltt_ust_channel *uchan;
2344 struct ltt_ust_session *usess;
2345
2346 usess = session->ust_session;
2347
2348 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2349 channel_name);
2350 if (uchan == NULL) {
2351 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2352 goto error;
2353 }
2354
2355 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2356 if (ret != LTTCOMM_OK) {
2357 goto error;
2358 }
2359
2360 DBG3("Disable UST event %s in channel %s completed", event_name,
2361 channel_name);
2362 break;
2363 }
2364 case LTTNG_DOMAIN_UST_EXEC_NAME:
2365 case LTTNG_DOMAIN_UST_PID:
2366 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2367 default:
2368 ret = LTTCOMM_NOT_IMPLEMENTED;
2369 goto error;
2370 }
2371
2372 ret = LTTCOMM_OK;
2373
2374 error:
2375 return ret;
2376 }
2377
2378 /*
2379 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2380 */
2381 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2382 char *channel_name)
2383 {
2384 int ret;
2385
2386 switch (domain) {
2387 case LTTNG_DOMAIN_KERNEL:
2388 {
2389 struct ltt_kernel_session *ksess;
2390 struct ltt_kernel_channel *kchan;
2391
2392 ksess = session->kernel_session;
2393
2394 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2395 if (kchan == NULL) {
2396 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2397 goto error;
2398 }
2399
2400 ret = event_kernel_disable_all(ksess, kchan);
2401 if (ret != LTTCOMM_OK) {
2402 goto error;
2403 }
2404
2405 kernel_wait_quiescent(kernel_tracer_fd);
2406 break;
2407 }
2408 case LTTNG_DOMAIN_UST:
2409 {
2410 struct ltt_ust_session *usess;
2411 struct ltt_ust_channel *uchan;
2412
2413 usess = session->ust_session;
2414
2415 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2416 channel_name);
2417 if (uchan == NULL) {
2418 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2419 goto error;
2420 }
2421
2422 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2423 if (ret != 0) {
2424 goto error;
2425 }
2426
2427 DBG3("Disable all UST events in channel %s completed", channel_name);
2428
2429 break;
2430 }
2431 case LTTNG_DOMAIN_UST_EXEC_NAME:
2432 case LTTNG_DOMAIN_UST_PID:
2433 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2434 default:
2435 ret = LTTCOMM_NOT_IMPLEMENTED;
2436 goto error;
2437 }
2438
2439 ret = LTTCOMM_OK;
2440
2441 error:
2442 return ret;
2443 }
2444
2445 /*
2446 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2447 */
2448 static int cmd_add_context(struct ltt_session *session, int domain,
2449 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2450 {
2451 int ret;
2452
2453 switch (domain) {
2454 case LTTNG_DOMAIN_KERNEL:
2455 /* Add kernel context to kernel tracer */
2456 ret = context_kernel_add(session->kernel_session, ctx,
2457 event_name, channel_name);
2458 if (ret != LTTCOMM_OK) {
2459 goto error;
2460 }
2461 break;
2462 case LTTNG_DOMAIN_UST:
2463 {
2464 struct ltt_ust_session *usess = session->ust_session;
2465
2466 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2467 if (ret != LTTCOMM_OK) {
2468 goto error;
2469 }
2470 break;
2471 }
2472 case LTTNG_DOMAIN_UST_EXEC_NAME:
2473 case LTTNG_DOMAIN_UST_PID:
2474 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2475 default:
2476 ret = LTTCOMM_NOT_IMPLEMENTED;
2477 goto error;
2478 }
2479
2480 ret = LTTCOMM_OK;
2481
2482 error:
2483 return ret;
2484 }
2485
2486 /*
2487 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2488 *
2489 * TODO: currently, both events and loglevels are kept within the same
2490 * namespace for UST global registry/app registery, so if an event
2491 * happen to have the same name as the loglevel (very unlikely though),
2492 * and an attempt is made to enable/disable both in the same session,
2493 * the first to be created will be the only one allowed to exist.
2494 */
2495 static int cmd_enable_event(struct ltt_session *session, int domain,
2496 char *channel_name, struct lttng_event *event)
2497 {
2498 int ret;
2499 struct lttng_channel *attr;
2500 struct ltt_ust_session *usess = session->ust_session;
2501
2502 switch (domain) {
2503 case LTTNG_DOMAIN_KERNEL:
2504 {
2505 struct ltt_kernel_channel *kchan;
2506
2507 kchan = trace_kernel_get_channel_by_name(channel_name,
2508 session->kernel_session);
2509 if (kchan == NULL) {
2510 attr = channel_new_default_attr(domain);
2511 if (attr == NULL) {
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
2515 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2516
2517 /* This call will notify the kernel thread */
2518 ret = channel_kernel_create(session->kernel_session,
2519 attr, kernel_poll_pipe[1]);
2520 if (ret != LTTCOMM_OK) {
2521 free(attr);
2522 goto error;
2523 }
2524 free(attr);
2525 }
2526
2527 /* Get the newly created kernel channel pointer */
2528 kchan = trace_kernel_get_channel_by_name(channel_name,
2529 session->kernel_session);
2530 if (kchan == NULL) {
2531 /* This sould not happen... */
2532 ret = LTTCOMM_FATAL;
2533 goto error;
2534 }
2535
2536 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2537 event);
2538 if (ret != LTTCOMM_OK) {
2539 goto error;
2540 }
2541
2542 kernel_wait_quiescent(kernel_tracer_fd);
2543 break;
2544 }
2545 case LTTNG_DOMAIN_UST:
2546 {
2547 struct lttng_channel *attr;
2548 struct ltt_ust_channel *uchan;
2549
2550 /* Get channel from global UST domain */
2551 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2552 channel_name);
2553 if (uchan == NULL) {
2554 /* Create default channel */
2555 attr = channel_new_default_attr(domain);
2556 if (attr == NULL) {
2557 ret = LTTCOMM_FATAL;
2558 goto error;
2559 }
2560 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2561 attr->name[NAME_MAX - 1] = '\0';
2562
2563 ret = channel_ust_create(usess, domain, attr);
2564 if (ret != LTTCOMM_OK) {
2565 free(attr);
2566 goto error;
2567 }
2568 free(attr);
2569
2570 /* Get the newly created channel reference back */
2571 uchan = trace_ust_find_channel_by_name(
2572 usess->domain_global.channels, channel_name);
2573 if (uchan == NULL) {
2574 /* Something is really wrong */
2575 ret = LTTCOMM_FATAL;
2576 goto error;
2577 }
2578 }
2579
2580 /* At this point, the session and channel exist on the tracer */
2581
2582 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2583 if (ret != LTTCOMM_OK) {
2584 goto error;
2585 }
2586 break;
2587 }
2588 case LTTNG_DOMAIN_UST_EXEC_NAME:
2589 case LTTNG_DOMAIN_UST_PID:
2590 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2591 default:
2592 ret = LTTCOMM_NOT_IMPLEMENTED;
2593 goto error;
2594 }
2595
2596 ret = LTTCOMM_OK;
2597
2598 error:
2599 return ret;
2600 }
2601
2602 /*
2603 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2604 */
2605 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2606 char *channel_name, int event_type)
2607 {
2608 int ret;
2609 struct ltt_kernel_channel *kchan;
2610
2611 switch (domain) {
2612 case LTTNG_DOMAIN_KERNEL:
2613 kchan = trace_kernel_get_channel_by_name(channel_name,
2614 session->kernel_session);
2615 if (kchan == NULL) {
2616 /* This call will notify the kernel thread */
2617 ret = channel_kernel_create(session->kernel_session, NULL,
2618 kernel_poll_pipe[1]);
2619 if (ret != LTTCOMM_OK) {
2620 goto error;
2621 }
2622
2623 /* Get the newly created kernel channel pointer */
2624 kchan = trace_kernel_get_channel_by_name(channel_name,
2625 session->kernel_session);
2626 if (kchan == NULL) {
2627 /* This sould not happen... */
2628 ret = LTTCOMM_FATAL;
2629 goto error;
2630 }
2631
2632 }
2633
2634 switch (event_type) {
2635 case LTTNG_EVENT_SYSCALL:
2636 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2637 kchan, kernel_tracer_fd);
2638 break;
2639 case LTTNG_EVENT_TRACEPOINT:
2640 /*
2641 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2642 * events already registered to the channel.
2643 */
2644 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2645 kchan, kernel_tracer_fd);
2646 break;
2647 case LTTNG_EVENT_ALL:
2648 /* Enable syscalls and tracepoints */
2649 ret = event_kernel_enable_all(session->kernel_session,
2650 kchan, kernel_tracer_fd);
2651 break;
2652 default:
2653 ret = LTTCOMM_KERN_ENABLE_FAIL;
2654 goto error;
2655 }
2656
2657 /* Manage return value */
2658 if (ret != LTTCOMM_OK) {
2659 goto error;
2660 }
2661
2662 kernel_wait_quiescent(kernel_tracer_fd);
2663 break;
2664 case LTTNG_DOMAIN_UST:
2665 {
2666 struct lttng_channel *attr;
2667 struct ltt_ust_channel *uchan;
2668 struct ltt_ust_session *usess = session->ust_session;
2669
2670 /* Get channel from global UST domain */
2671 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2672 channel_name);
2673 if (uchan == NULL) {
2674 /* Create default channel */
2675 attr = channel_new_default_attr(domain);
2676 if (attr == NULL) {
2677 ret = LTTCOMM_FATAL;
2678 goto error;
2679 }
2680 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2681 attr->name[NAME_MAX - 1] = '\0';
2682
2683 /* Use the internal command enable channel */
2684 ret = channel_ust_create(usess, domain, attr);
2685 if (ret != LTTCOMM_OK) {
2686 free(attr);
2687 goto error;
2688 }
2689 free(attr);
2690
2691 /* Get the newly created channel reference back */
2692 uchan = trace_ust_find_channel_by_name(
2693 usess->domain_global.channels, channel_name);
2694 if (uchan == NULL) {
2695 /* Something is really wrong */
2696 ret = LTTCOMM_FATAL;
2697 goto error;
2698 }
2699 }
2700
2701 /* At this point, the session and channel exist on the tracer */
2702
2703 switch (event_type) {
2704 case LTTNG_EVENT_ALL:
2705 case LTTNG_EVENT_TRACEPOINT:
2706 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2707 if (ret != LTTCOMM_OK) {
2708 goto error;
2709 }
2710 break;
2711 default:
2712 ret = LTTCOMM_UST_ENABLE_FAIL;
2713 goto error;
2714 }
2715
2716 /* Manage return value */
2717 if (ret != LTTCOMM_OK) {
2718 goto error;
2719 }
2720
2721 break;
2722 }
2723 case LTTNG_DOMAIN_UST_EXEC_NAME:
2724 case LTTNG_DOMAIN_UST_PID:
2725 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2726 default:
2727 ret = LTTCOMM_NOT_IMPLEMENTED;
2728 goto error;
2729 }
2730
2731 ret = LTTCOMM_OK;
2732
2733 error:
2734 return ret;
2735 }
2736
2737 /*
2738 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2739 */
2740 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2741 {
2742 int ret;
2743 ssize_t nb_events = 0;
2744
2745 switch (domain) {
2746 case LTTNG_DOMAIN_KERNEL:
2747 nb_events = kernel_list_events(kernel_tracer_fd, events);
2748 if (nb_events < 0) {
2749 ret = LTTCOMM_KERN_LIST_FAIL;
2750 goto error;
2751 }
2752 break;
2753 case LTTNG_DOMAIN_UST:
2754 nb_events = ust_app_list_events(events);
2755 if (nb_events < 0) {
2756 ret = LTTCOMM_UST_LIST_FAIL;
2757 goto error;
2758 }
2759 break;
2760 default:
2761 ret = LTTCOMM_NOT_IMPLEMENTED;
2762 goto error;
2763 }
2764
2765 return nb_events;
2766
2767 error:
2768 /* Return negative value to differentiate return code */
2769 return -ret;
2770 }
2771
2772 /*
2773 * Command LTTNG_START_TRACE processed by the client thread.
2774 */
2775 static int cmd_start_trace(struct ltt_session *session)
2776 {
2777 int ret;
2778 struct ltt_kernel_session *ksession;
2779 struct ltt_ust_session *usess;
2780
2781 /* Short cut */
2782 ksession = session->kernel_session;
2783 usess = session->ust_session;
2784
2785 if (session->enabled) {
2786 ret = LTTCOMM_UST_START_FAIL;
2787 goto error;
2788 }
2789
2790 session->enabled = 1;
2791
2792 /* Kernel tracing */
2793 if (ksession != NULL) {
2794 struct ltt_kernel_channel *kchan;
2795
2796 /* Open kernel metadata */
2797 if (ksession->metadata == NULL) {
2798 ret = kernel_open_metadata(ksession, ksession->trace_path);
2799 if (ret < 0) {
2800 ret = LTTCOMM_KERN_META_FAIL;
2801 goto error;
2802 }
2803 }
2804
2805 /* Open kernel metadata stream */
2806 if (ksession->metadata_stream_fd == 0) {
2807 ret = kernel_open_metadata_stream(ksession);
2808 if (ret < 0) {
2809 ERR("Kernel create metadata stream failed");
2810 ret = LTTCOMM_KERN_STREAM_FAIL;
2811 goto error;
2812 }
2813 }
2814
2815 /* For each channel */
2816 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2817 if (kchan->stream_count == 0) {
2818 ret = kernel_open_channel_stream(kchan);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_STREAM_FAIL;
2821 goto error;
2822 }
2823 /* Update the stream global counter */
2824 ksession->stream_count_global += ret;
2825 }
2826 }
2827
2828 /* Setup kernel consumer socket and send fds to it */
2829 ret = init_kernel_tracing(ksession);
2830 if (ret < 0) {
2831 ret = LTTCOMM_KERN_START_FAIL;
2832 goto error;
2833 }
2834
2835 /* This start the kernel tracing */
2836 ret = kernel_start_session(ksession);
2837 if (ret < 0) {
2838 ret = LTTCOMM_KERN_START_FAIL;
2839 goto error;
2840 }
2841
2842 /* Quiescent wait after starting trace */
2843 kernel_wait_quiescent(kernel_tracer_fd);
2844 }
2845
2846 /* Flag session that trace should start automatically */
2847 if (usess) {
2848 usess->start_trace = 1;
2849
2850 ret = ust_app_start_trace_all(usess);
2851 if (ret < 0) {
2852 ret = LTTCOMM_UST_START_FAIL;
2853 goto error;
2854 }
2855 }
2856
2857 ret = LTTCOMM_OK;
2858
2859 error:
2860 return ret;
2861 }
2862
2863 /*
2864 * Command LTTNG_STOP_TRACE processed by the client thread.
2865 */
2866 static int cmd_stop_trace(struct ltt_session *session)
2867 {
2868 int ret;
2869 struct ltt_kernel_channel *kchan;
2870 struct ltt_kernel_session *ksession;
2871 struct ltt_ust_session *usess;
2872
2873 /* Short cut */
2874 ksession = session->kernel_session;
2875 usess = session->ust_session;
2876
2877 if (!session->enabled) {
2878 ret = LTTCOMM_UST_START_FAIL;
2879 goto error;
2880 }
2881
2882 session->enabled = 0;
2883
2884 /* Kernel tracer */
2885 if (ksession != NULL) {
2886 DBG("Stop kernel tracing");
2887
2888 /* Flush all buffers before stopping */
2889 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2890 if (ret < 0) {
2891 ERR("Kernel metadata flush failed");
2892 }
2893
2894 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2895 ret = kernel_flush_buffer(kchan);
2896 if (ret < 0) {
2897 ERR("Kernel flush buffer error");
2898 }
2899 }
2900
2901 ret = kernel_stop_session(ksession);
2902 if (ret < 0) {
2903 ret = LTTCOMM_KERN_STOP_FAIL;
2904 goto error;
2905 }
2906
2907 kernel_wait_quiescent(kernel_tracer_fd);
2908 }
2909
2910 if (usess) {
2911 usess->start_trace = 0;
2912
2913 ret = ust_app_stop_trace_all(usess);
2914 if (ret < 0) {
2915 ret = LTTCOMM_UST_START_FAIL;
2916 goto error;
2917 }
2918 }
2919
2920 ret = LTTCOMM_OK;
2921
2922 error:
2923 return ret;
2924 }
2925
2926 /*
2927 * Command LTTNG_CREATE_SESSION processed by the client thread.
2928 */
2929 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2930 {
2931 int ret;
2932
2933 ret = session_create(name, path, creds->uid, creds->gid);
2934 if (ret != LTTCOMM_OK) {
2935 goto error;
2936 }
2937
2938 ret = LTTCOMM_OK;
2939
2940 error:
2941 return ret;
2942 }
2943
2944 /*
2945 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2946 */
2947 static int cmd_destroy_session(struct ltt_session *session, char *name)
2948 {
2949 int ret;
2950
2951 /* Clean kernel session teardown */
2952 teardown_kernel_session(session);
2953 /* UST session teardown */
2954 teardown_ust_session(session);
2955
2956 /*
2957 * Must notify the kernel thread here to update it's poll setin order
2958 * to remove the channel(s)' fd just destroyed.
2959 */
2960 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2961 if (ret < 0) {
2962 perror("write kernel poll pipe");
2963 }
2964
2965 ret = session_destroy(session);
2966
2967 return ret;
2968 }
2969
2970 /*
2971 * Command LTTNG_CALIBRATE processed by the client thread.
2972 */
2973 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2974 {
2975 int ret;
2976
2977 switch (domain) {
2978 case LTTNG_DOMAIN_KERNEL:
2979 {
2980 struct lttng_kernel_calibrate kcalibrate;
2981
2982 kcalibrate.type = calibrate->type;
2983 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2984 if (ret < 0) {
2985 ret = LTTCOMM_KERN_ENABLE_FAIL;
2986 goto error;
2987 }
2988 break;
2989 }
2990 default:
2991 /* TODO: Userspace tracing */
2992 ret = LTTCOMM_NOT_IMPLEMENTED;
2993 goto error;
2994 }
2995
2996 ret = LTTCOMM_OK;
2997
2998 error:
2999 return ret;
3000 }
3001
3002 /*
3003 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3004 */
3005 static int cmd_register_consumer(struct ltt_session *session, int domain,
3006 char *sock_path)
3007 {
3008 int ret, sock;
3009
3010 switch (domain) {
3011 case LTTNG_DOMAIN_KERNEL:
3012 /* Can't register a consumer if there is already one */
3013 if (session->kernel_session->consumer_fds_sent != 0) {
3014 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3015 goto error;
3016 }
3017
3018 sock = lttcomm_connect_unix_sock(sock_path);
3019 if (sock < 0) {
3020 ret = LTTCOMM_CONNECT_FAIL;
3021 goto error;
3022 }
3023
3024 session->kernel_session->consumer_fd = sock;
3025 break;
3026 default:
3027 /* TODO: Userspace tracing */
3028 ret = LTTCOMM_NOT_IMPLEMENTED;
3029 goto error;
3030 }
3031
3032 ret = LTTCOMM_OK;
3033
3034 error:
3035 return ret;
3036 }
3037
3038 /*
3039 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3040 */
3041 static ssize_t cmd_list_domains(struct ltt_session *session,
3042 struct lttng_domain **domains)
3043 {
3044 int ret, index = 0;
3045 ssize_t nb_dom = 0;
3046
3047 if (session->kernel_session != NULL) {
3048 DBG3("Listing domains found kernel domain");
3049 nb_dom++;
3050 }
3051
3052 if (session->ust_session != NULL) {
3053 DBG3("Listing domains found UST global domain");
3054 nb_dom++;
3055 }
3056
3057 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3058 if (*domains == NULL) {
3059 ret = -LTTCOMM_FATAL;
3060 goto error;
3061 }
3062
3063 if (session->kernel_session != NULL) {
3064 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3065 index++;
3066 }
3067
3068 if (session->ust_session != NULL) {
3069 (*domains)[index].type = LTTNG_DOMAIN_UST;
3070 index++;
3071 }
3072
3073 return nb_dom;
3074
3075 error:
3076 return ret;
3077 }
3078
3079 /*
3080 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3081 */
3082 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3083 struct lttng_channel **channels)
3084 {
3085 int ret;
3086 ssize_t nb_chan = 0;
3087
3088 switch (domain) {
3089 case LTTNG_DOMAIN_KERNEL:
3090 if (session->kernel_session != NULL) {
3091 nb_chan = session->kernel_session->channel_count;
3092 }
3093 DBG3("Number of kernel channels %zd", nb_chan);
3094 break;
3095 case LTTNG_DOMAIN_UST:
3096 if (session->ust_session != NULL) {
3097 nb_chan = hashtable_get_count(
3098 session->ust_session->domain_global.channels);
3099 }
3100 DBG3("Number of UST global channels %zd", nb_chan);
3101 break;
3102 default:
3103 *channels = NULL;
3104 ret = -LTTCOMM_NOT_IMPLEMENTED;
3105 goto error;
3106 }
3107
3108 if (nb_chan > 0) {
3109 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3110 if (*channels == NULL) {
3111 ret = -LTTCOMM_FATAL;
3112 goto error;
3113 }
3114
3115 list_lttng_channels(domain, session, *channels);
3116 } else {
3117 *channels = NULL;
3118 }
3119
3120 return nb_chan;
3121
3122 error:
3123 return ret;
3124 }
3125
3126 /*
3127 * Command LTTNG_LIST_EVENTS processed by the client thread.
3128 */
3129 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3130 char *channel_name, struct lttng_event **events)
3131 {
3132 int ret = 0;
3133 ssize_t nb_event = 0;
3134
3135 switch (domain) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (session->kernel_session != NULL) {
3138 nb_event = list_lttng_kernel_events(channel_name,
3139 session->kernel_session, events);
3140 }
3141 break;
3142 case LTTNG_DOMAIN_UST:
3143 {
3144 if (session->ust_session != NULL) {
3145 nb_event = list_lttng_ust_global_events(channel_name,
3146 &session->ust_session->domain_global, events);
3147 }
3148 break;
3149 }
3150 default:
3151 ret = -LTTCOMM_NOT_IMPLEMENTED;
3152 goto error;
3153 }
3154
3155 ret = nb_event;
3156
3157 error:
3158 return ret;
3159 }
3160
3161 /*
3162 * Process the command requested by the lttng client within the command
3163 * context structure. This function make sure that the return structure (llm)
3164 * is set and ready for transmission before returning.
3165 *
3166 * Return any error encountered or 0 for success.
3167 */
3168 static int process_client_msg(struct command_ctx *cmd_ctx)
3169 {
3170 int ret = LTTCOMM_OK;
3171 int need_tracing_session = 1;
3172
3173 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3174
3175 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3176 ret = LTTCOMM_KERN_NA;
3177 goto error;
3178 }
3179
3180 /*
3181 * Check for command that don't needs to allocate a returned payload. We do
3182 * this here so we don't have to make the call for no payload at each
3183 * command.
3184 */
3185 switch(cmd_ctx->lsm->cmd_type) {
3186 case LTTNG_LIST_SESSIONS:
3187 case LTTNG_LIST_TRACEPOINTS:
3188 case LTTNG_LIST_DOMAINS:
3189 case LTTNG_LIST_CHANNELS:
3190 case LTTNG_LIST_EVENTS:
3191 break;
3192 default:
3193 /* Setup lttng message with no payload */
3194 ret = setup_lttng_msg(cmd_ctx, 0);
3195 if (ret < 0) {
3196 /* This label does not try to unlock the session */
3197 goto init_setup_error;
3198 }
3199 }
3200
3201 /* Commands that DO NOT need a session. */
3202 switch (cmd_ctx->lsm->cmd_type) {
3203 case LTTNG_CALIBRATE:
3204 case LTTNG_CREATE_SESSION:
3205 case LTTNG_LIST_SESSIONS:
3206 case LTTNG_LIST_TRACEPOINTS:
3207 need_tracing_session = 0;
3208 break;
3209 default:
3210 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3211 session_lock_list();
3212 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3213 session_unlock_list();
3214 if (cmd_ctx->session == NULL) {
3215 if (cmd_ctx->lsm->session.name != NULL) {
3216 ret = LTTCOMM_SESS_NOT_FOUND;
3217 } else {
3218 /* If no session name specified */
3219 ret = LTTCOMM_SELECT_SESS;
3220 }
3221 goto error;
3222 } else {
3223 /* Acquire lock for the session */
3224 session_lock(cmd_ctx->session);
3225 }
3226 break;
3227 }
3228
3229 /*
3230 * Check domain type for specific "pre-action".
3231 */
3232 switch (cmd_ctx->lsm->domain.type) {
3233 case LTTNG_DOMAIN_KERNEL:
3234 /* Kernel tracer check */
3235 if (kernel_tracer_fd == 0) {
3236 /* Basically, load kernel tracer modules */
3237 init_kernel_tracer();
3238 if (kernel_tracer_fd == 0) {
3239 ret = LTTCOMM_KERN_NA;
3240 goto error;
3241 }
3242 }
3243
3244 /* Need a session for kernel command */
3245 if (need_tracing_session) {
3246 if (cmd_ctx->session->kernel_session == NULL) {
3247 ret = create_kernel_session(cmd_ctx->session);
3248 if (ret < 0) {
3249 ret = LTTCOMM_KERN_SESS_FAIL;
3250 goto error;
3251 }
3252 }
3253
3254 /* Start the kernel consumer daemon */
3255 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3256 if (kconsumer_data.pid == 0 &&
3257 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3258 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3259 ret = start_consumerd(&kconsumer_data);
3260 if (ret < 0) {
3261 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3262 goto error;
3263 }
3264 } else {
3265 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3266 }
3267 }
3268 break;
3269 case LTTNG_DOMAIN_UST:
3270 {
3271 if (need_tracing_session) {
3272 if (cmd_ctx->session->ust_session == NULL) {
3273 ret = create_ust_session(cmd_ctx->session,
3274 &cmd_ctx->lsm->domain);
3275 if (ret != LTTCOMM_OK) {
3276 goto error;
3277 }
3278 }
3279 /* Start the UST consumer daemons */
3280 /* 64-bit */
3281 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3282 if (consumerd64_bin[0] != '\0' &&
3283 ustconsumer64_data.pid == 0 &&
3284 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3285 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3286 ret = start_consumerd(&ustconsumer64_data);
3287 if (ret < 0) {
3288 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3289 ust_consumerd64_fd = -EINVAL;
3290 goto error;
3291 }
3292
3293 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3294 } else {
3295 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3296 }
3297 /* 32-bit */
3298 if (consumerd32_bin[0] != '\0' &&
3299 ustconsumer32_data.pid == 0 &&
3300 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3301 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3302 ret = start_consumerd(&ustconsumer32_data);
3303 if (ret < 0) {
3304 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3305 ust_consumerd32_fd = -EINVAL;
3306 goto error;
3307 }
3308 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3309 } else {
3310 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3311 }
3312 }
3313 break;
3314 }
3315 default:
3316 break;
3317 }
3318
3319 /* Process by command type */
3320 switch (cmd_ctx->lsm->cmd_type) {
3321 case LTTNG_ADD_CONTEXT:
3322 {
3323 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3324 cmd_ctx->lsm->u.context.channel_name,
3325 cmd_ctx->lsm->u.context.event_name,
3326 &cmd_ctx->lsm->u.context.ctx);
3327 break;
3328 }
3329 case LTTNG_DISABLE_CHANNEL:
3330 {
3331 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3332 cmd_ctx->lsm->u.disable.channel_name);
3333 break;
3334 }
3335 case LTTNG_DISABLE_EVENT:
3336 {
3337 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3338 cmd_ctx->lsm->u.disable.channel_name,
3339 cmd_ctx->lsm->u.disable.name);
3340 ret = LTTCOMM_OK;
3341 break;
3342 }
3343 case LTTNG_DISABLE_ALL_EVENT:
3344 {
3345 DBG("Disabling all events");
3346
3347 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3348 cmd_ctx->lsm->u.disable.channel_name);
3349 break;
3350 }
3351 case LTTNG_ENABLE_CHANNEL:
3352 {
3353 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3354 &cmd_ctx->lsm->u.channel.chan);
3355 break;
3356 }
3357 case LTTNG_ENABLE_EVENT:
3358 {
3359 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3360 cmd_ctx->lsm->u.enable.channel_name,
3361 &cmd_ctx->lsm->u.enable.event);
3362 break;
3363 }
3364 case LTTNG_ENABLE_ALL_EVENT:
3365 {
3366 DBG("Enabling all events");
3367
3368 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3369 cmd_ctx->lsm->u.enable.channel_name,
3370 cmd_ctx->lsm->u.enable.event.type);
3371 break;
3372 }
3373 case LTTNG_LIST_TRACEPOINTS:
3374 {
3375 struct lttng_event *events;
3376 ssize_t nb_events;
3377
3378 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3379 if (nb_events < 0) {
3380 ret = -nb_events;
3381 goto error;
3382 }
3383
3384 /*
3385 * Setup lttng message with payload size set to the event list size in
3386 * bytes and then copy list into the llm payload.
3387 */
3388 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3389 if (ret < 0) {
3390 free(events);
3391 goto setup_error;
3392 }
3393
3394 /* Copy event list into message payload */
3395 memcpy(cmd_ctx->llm->payload, events,
3396 sizeof(struct lttng_event) * nb_events);
3397
3398 free(events);
3399
3400 ret = LTTCOMM_OK;
3401 break;
3402 }
3403 case LTTNG_START_TRACE:
3404 {
3405 ret = cmd_start_trace(cmd_ctx->session);
3406 break;
3407 }
3408 case LTTNG_STOP_TRACE:
3409 {
3410 ret = cmd_stop_trace(cmd_ctx->session);
3411 break;
3412 }
3413 case LTTNG_CREATE_SESSION:
3414 {
3415 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3416 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3417 break;
3418 }
3419 case LTTNG_DESTROY_SESSION:
3420 {
3421 ret = cmd_destroy_session(cmd_ctx->session,
3422 cmd_ctx->lsm->session.name);
3423 break;
3424 }
3425 case LTTNG_LIST_DOMAINS:
3426 {
3427 ssize_t nb_dom;
3428 struct lttng_domain *domains;
3429
3430 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3431 if (nb_dom < 0) {
3432 ret = -nb_dom;
3433 goto error;
3434 }
3435
3436 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3437 if (ret < 0) {
3438 goto setup_error;
3439 }
3440
3441 /* Copy event list into message payload */
3442 memcpy(cmd_ctx->llm->payload, domains,
3443 nb_dom * sizeof(struct lttng_domain));
3444
3445 free(domains);
3446
3447 ret = LTTCOMM_OK;
3448 break;
3449 }
3450 case LTTNG_LIST_CHANNELS:
3451 {
3452 size_t nb_chan;
3453 struct lttng_channel *channels;
3454
3455 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3456 cmd_ctx->session, &channels);
3457 if (nb_chan < 0) {
3458 ret = -nb_chan;
3459 goto error;
3460 }
3461
3462 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3463 if (ret < 0) {
3464 goto setup_error;
3465 }
3466
3467 /* Copy event list into message payload */
3468 memcpy(cmd_ctx->llm->payload, channels,
3469 nb_chan * sizeof(struct lttng_channel));
3470
3471 free(channels);
3472
3473 ret = LTTCOMM_OK;
3474 break;
3475 }
3476 case LTTNG_LIST_EVENTS:
3477 {
3478 ssize_t nb_event;
3479 struct lttng_event *events = NULL;
3480
3481 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3482 cmd_ctx->lsm->u.list.channel_name, &events);
3483 if (nb_event < 0) {
3484 ret = -nb_event;
3485 goto error;
3486 }
3487
3488 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3489 if (ret < 0) {
3490 goto setup_error;
3491 }
3492
3493 /* Copy event list into message payload */
3494 memcpy(cmd_ctx->llm->payload, events,
3495 nb_event * sizeof(struct lttng_event));
3496
3497 free(events);
3498
3499 ret = LTTCOMM_OK;
3500 break;
3501 }
3502 case LTTNG_LIST_SESSIONS:
3503 {
3504 session_lock_list();
3505
3506 if (session_list_ptr->count == 0) {
3507 ret = LTTCOMM_NO_SESSION;
3508 session_unlock_list();
3509 goto error;
3510 }
3511
3512 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3513 session_list_ptr->count);
3514 if (ret < 0) {
3515 session_unlock_list();
3516 goto setup_error;
3517 }
3518
3519 /* Filled the session array */
3520 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3521
3522 session_unlock_list();
3523
3524 ret = LTTCOMM_OK;
3525 break;
3526 }
3527 case LTTNG_CALIBRATE:
3528 {
3529 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3530 &cmd_ctx->lsm->u.calibrate);
3531 break;
3532 }
3533 case LTTNG_REGISTER_CONSUMER:
3534 {
3535 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3536 cmd_ctx->lsm->u.reg.path);
3537 break;
3538 }
3539 default:
3540 ret = LTTCOMM_UND;
3541 break;
3542 }
3543
3544 error:
3545 if (cmd_ctx->llm == NULL) {
3546 DBG("Missing llm structure. Allocating one.");
3547 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3548 goto setup_error;
3549 }
3550 }
3551 /* Set return code */
3552 cmd_ctx->llm->ret_code = ret;
3553 setup_error:
3554 if (cmd_ctx->session) {
3555 session_unlock(cmd_ctx->session);
3556 }
3557 init_setup_error:
3558 return ret;
3559 }
3560
3561 /*
3562 * This thread manage all clients request using the unix client socket for
3563 * communication.
3564 */
3565 static void *thread_manage_clients(void *data)
3566 {
3567 int sock = 0, ret, i, pollfd;
3568 uint32_t revents, nb_fd;
3569 struct command_ctx *cmd_ctx = NULL;
3570 struct lttng_poll_event events;
3571
3572 DBG("[thread] Manage client started");
3573
3574 rcu_register_thread();
3575
3576 ret = lttcomm_listen_unix_sock(client_sock);
3577 if (ret < 0) {
3578 goto error;
3579 }
3580
3581 /*
3582 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3583 * more will be added to this poll set.
3584 */
3585 ret = create_thread_poll_set(&events, 2);
3586 if (ret < 0) {
3587 goto error;
3588 }
3589
3590 /* Add the application registration socket */
3591 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3592 if (ret < 0) {
3593 goto error;
3594 }
3595
3596 /*
3597 * Notify parent pid that we are ready to accept command for client side.
3598 */
3599 if (opt_sig_parent) {
3600 kill(ppid, SIGCHLD);
3601 }
3602
3603 while (1) {
3604 DBG("Accepting client command ...");
3605
3606 nb_fd = LTTNG_POLL_GETNB(&events);
3607
3608 /* Inifinite blocking call, waiting for transmission */
3609 ret = lttng_poll_wait(&events, -1);
3610 if (ret < 0) {
3611 goto error;
3612 }
3613
3614 for (i = 0; i < nb_fd; i++) {
3615 /* Fetch once the poll data */
3616 revents = LTTNG_POLL_GETEV(&events, i);
3617 pollfd = LTTNG_POLL_GETFD(&events, i);
3618
3619 /* Thread quit pipe has been closed. Killing thread. */
3620 ret = check_thread_quit_pipe(pollfd, revents);
3621 if (ret) {
3622 goto error;
3623 }
3624
3625 /* Event on the registration socket */
3626 if (pollfd == client_sock) {
3627 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3628 ERR("Client socket poll error");
3629 goto error;
3630 }
3631 }
3632 }
3633
3634 DBG("Wait for client response");
3635
3636 sock = lttcomm_accept_unix_sock(client_sock);
3637 if (sock < 0) {
3638 goto error;
3639 }
3640
3641 /* Set socket option for credentials retrieval */
3642 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3643 if (ret < 0) {
3644 goto error;
3645 }
3646
3647 /* Allocate context command to process the client request */
3648 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3649 if (cmd_ctx == NULL) {
3650 perror("zmalloc cmd_ctx");
3651 goto error;
3652 }
3653
3654 /* Allocate data buffer for reception */
3655 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3656 if (cmd_ctx->lsm == NULL) {
3657 perror("zmalloc cmd_ctx->lsm");
3658 goto error;
3659 }
3660
3661 cmd_ctx->llm = NULL;
3662 cmd_ctx->session = NULL;
3663
3664 /*
3665 * Data is received from the lttng client. The struct
3666 * lttcomm_session_msg (lsm) contains the command and data request of
3667 * the client.
3668 */
3669 DBG("Receiving data from client ...");
3670 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3671 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3672 if (ret <= 0) {
3673 DBG("Nothing recv() from client... continuing");
3674 close(sock);
3675 free(cmd_ctx);
3676 continue;
3677 }
3678
3679 // TODO: Validate cmd_ctx including sanity check for
3680 // security purpose.
3681
3682 rcu_thread_online();
3683 /*
3684 * This function dispatch the work to the kernel or userspace tracer
3685 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3686 * informations for the client. The command context struct contains
3687 * everything this function may needs.
3688 */
3689 ret = process_client_msg(cmd_ctx);
3690 rcu_thread_offline();
3691 if (ret < 0) {
3692 /*
3693 * TODO: Inform client somehow of the fatal error. At
3694 * this point, ret < 0 means that a zmalloc failed
3695 * (ENOMEM). Error detected but still accept command.
3696 */
3697 clean_command_ctx(&cmd_ctx);
3698 continue;
3699 }
3700
3701 DBG("Sending response (size: %d, retcode: %s)",
3702 cmd_ctx->lttng_msg_size,
3703 lttng_strerror(-cmd_ctx->llm->ret_code));
3704 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3705 if (ret < 0) {
3706 ERR("Failed to send data back to client");
3707 }
3708
3709 /* End of transmission */
3710 close(sock);
3711
3712 clean_command_ctx(&cmd_ctx);
3713 }
3714
3715 error:
3716 DBG("Client thread dying");
3717 unlink(client_unix_sock_path);
3718 close(client_sock);
3719 close(sock);
3720
3721 lttng_poll_clean(&events);
3722 clean_command_ctx(&cmd_ctx);
3723
3724 rcu_unregister_thread();
3725 return NULL;
3726 }
3727
3728
3729 /*
3730 * usage function on stderr
3731 */
3732 static void usage(void)
3733 {
3734 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3735 fprintf(stderr, " -h, --help Display this usage.\n");
3736 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3737 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3738 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3739 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3740 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3741 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3742 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3743 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3744 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3745 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3746 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3747 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3748 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3749 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3750 fprintf(stderr, " -V, --version Show version number.\n");
3751 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3752 fprintf(stderr, " -q, --quiet No output at all.\n");
3753 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3754 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3755 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3756 }
3757
3758 /*
3759 * daemon argument parsing
3760 */
3761 static int parse_args(int argc, char **argv)
3762 {
3763 int c;
3764
3765 static struct option long_options[] = {
3766 { "client-sock", 1, 0, 'c' },
3767 { "apps-sock", 1, 0, 'a' },
3768 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3769 { "kconsumerd-err-sock", 1, 0, 'E' },
3770 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3771 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3772 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3773 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3774 { "consumerd32-path", 1, 0, 'u' },
3775 { "consumerd32-libdir", 1, 0, 'U' },
3776 { "consumerd64-path", 1, 0, 't' },
3777 { "consumerd64-libdir", 1, 0, 'T' },
3778 { "daemonize", 0, 0, 'd' },
3779 { "sig-parent", 0, 0, 'S' },
3780 { "help", 0, 0, 'h' },
3781 { "group", 1, 0, 'g' },
3782 { "version", 0, 0, 'V' },
3783 { "quiet", 0, 0, 'q' },
3784 { "verbose", 0, 0, 'v' },
3785 { "verbose-consumer", 0, 0, 'Z' },
3786 { "no-kernel", 0, 0, 'N' },
3787 { NULL, 0, 0, 0 }
3788 };
3789
3790 while (1) {
3791 int option_index = 0;
3792 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3793 long_options, &option_index);
3794 if (c == -1) {
3795 break;
3796 }
3797
3798 switch (c) {
3799 case 0:
3800 fprintf(stderr, "option %s", long_options[option_index].name);
3801 if (optarg) {
3802 fprintf(stderr, " with arg %s\n", optarg);
3803 }
3804 break;
3805 case 'c':
3806 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3807 break;
3808 case 'a':
3809 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3810 break;
3811 case 'd':
3812 opt_daemon = 1;
3813 break;
3814 case 'g':
3815 opt_tracing_group = optarg;
3816 break;
3817 case 'h':
3818 usage();
3819 exit(EXIT_FAILURE);
3820 case 'V':
3821 fprintf(stdout, "%s\n", VERSION);
3822 exit(EXIT_SUCCESS);
3823 case 'S':
3824 opt_sig_parent = 1;
3825 break;
3826 case 'E':
3827 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3828 break;
3829 case 'C':
3830 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3831 break;
3832 case 'F':
3833 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3834 break;
3835 case 'D':
3836 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3837 break;
3838 case 'H':
3839 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3840 break;
3841 case 'G':
3842 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3843 break;
3844 case 'N':
3845 opt_no_kernel = 1;
3846 break;
3847 case 'q':
3848 opt_quiet = 1;
3849 break;
3850 case 'v':
3851 /* Verbose level can increase using multiple -v */
3852 opt_verbose += 1;
3853 break;
3854 case 'Z':
3855 opt_verbose_consumer += 1;
3856 break;
3857 case 'u':
3858 consumerd32_bin= optarg;
3859 break;
3860 case 'U':
3861 consumerd32_libdir = optarg;
3862 break;
3863 case 't':
3864 consumerd64_bin = optarg;
3865 break;
3866 case 'T':
3867 consumerd64_libdir = optarg;
3868 break;
3869 default:
3870 /* Unknown option or other error.
3871 * Error is printed by getopt, just return */
3872 return -1;
3873 }
3874 }
3875
3876 return 0;
3877 }
3878
3879 /*
3880 * Creates the two needed socket by the daemon.
3881 * apps_sock - The communication socket for all UST apps.
3882 * client_sock - The communication of the cli tool (lttng).
3883 */
3884 static int init_daemon_socket(void)
3885 {
3886 int ret = 0;
3887 mode_t old_umask;
3888
3889 old_umask = umask(0);
3890
3891 /* Create client tool unix socket */
3892 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3893 if (client_sock < 0) {
3894 ERR("Create unix sock failed: %s", client_unix_sock_path);
3895 ret = -1;
3896 goto end;
3897 }
3898
3899 /* File permission MUST be 660 */
3900 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3901 if (ret < 0) {
3902 ERR("Set file permissions failed: %s", client_unix_sock_path);
3903 perror("chmod");
3904 goto end;
3905 }
3906
3907 /* Create the application unix socket */
3908 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3909 if (apps_sock < 0) {
3910 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3911 ret = -1;
3912 goto end;
3913 }
3914
3915 /* File permission MUST be 666 */
3916 ret = chmod(apps_unix_sock_path,
3917 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3918 if (ret < 0) {
3919 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3920 perror("chmod");
3921 goto end;
3922 }
3923
3924 end:
3925 umask(old_umask);
3926 return ret;
3927 }
3928
3929 /*
3930 * Check if the global socket is available, and if a daemon is answering at the
3931 * other side. If yes, error is returned.
3932 */
3933 static int check_existing_daemon(void)
3934 {
3935 if (access(client_unix_sock_path, F_OK) < 0 &&
3936 access(apps_unix_sock_path, F_OK) < 0) {
3937 return 0;
3938 }
3939
3940 /* Is there anybody out there ? */
3941 if (lttng_session_daemon_alive()) {
3942 return -EEXIST;
3943 } else {
3944 return 0;
3945 }
3946 }
3947
3948 /*
3949 * Set the tracing group gid onto the client socket.
3950 *
3951 * Race window between mkdir and chown is OK because we are going from more
3952 * permissive (root.root) to les permissive (root.tracing).
3953 */
3954 static int set_permissions(char *rundir)
3955 {
3956 int ret;
3957 gid_t gid;
3958
3959 gid = allowed_group();
3960 if (gid < 0) {
3961 WARN("No tracing group detected");
3962 ret = 0;
3963 goto end;
3964 }
3965
3966 /* Set lttng run dir */
3967 ret = chown(rundir, 0, gid);
3968 if (ret < 0) {
3969 ERR("Unable to set group on %s", rundir);
3970 perror("chown");
3971 }
3972
3973 /* lttng client socket path */
3974 ret = chown(client_unix_sock_path, 0, gid);
3975 if (ret < 0) {
3976 ERR("Unable to set group on %s", client_unix_sock_path);
3977 perror("chown");
3978 }
3979
3980 /* kconsumer error socket path */
3981 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3982 if (ret < 0) {
3983 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3984 perror("chown");
3985 }
3986
3987 /* 64-bit ustconsumer error socket path */
3988 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3989 if (ret < 0) {
3990 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3991 perror("chown");
3992 }
3993
3994 /* 32-bit ustconsumer compat32 error socket path */
3995 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3996 if (ret < 0) {
3997 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3998 perror("chown");
3999 }
4000
4001 DBG("All permissions are set");
4002
4003 end:
4004 return ret;
4005 }
4006
4007 /*
4008 * Create the pipe used to wake up the kernel thread.
4009 */
4010 static int create_kernel_poll_pipe(void)
4011 {
4012 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4013 }
4014
4015 /*
4016 * Create the application command pipe to wake thread_manage_apps.
4017 */
4018 static int create_apps_cmd_pipe(void)
4019 {
4020 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4021 }
4022
4023 /*
4024 * Create the lttng run directory needed for all global sockets and pipe.
4025 */
4026 static int create_lttng_rundir(const char *rundir)
4027 {
4028 int ret;
4029
4030 DBG3("Creating LTTng run directory: %s", rundir);
4031
4032 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4033 if (ret < 0) {
4034 if (errno != EEXIST) {
4035 ERR("Unable to create %s", rundir);
4036 goto error;
4037 } else {
4038 ret = 0;
4039 }
4040 }
4041
4042 error:
4043 return ret;
4044 }
4045
4046 /*
4047 * Setup sockets and directory needed by the kconsumerd communication with the
4048 * session daemon.
4049 */
4050 static int set_consumer_sockets(struct consumer_data *consumer_data,
4051 const char *rundir)
4052 {
4053 int ret;
4054 char path[PATH_MAX];
4055
4056 switch (consumer_data->type) {
4057 case LTTNG_CONSUMER_KERNEL:
4058 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4059 break;
4060 case LTTNG_CONSUMER64_UST:
4061 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4062 break;
4063 case LTTNG_CONSUMER32_UST:
4064 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4065 break;
4066 default:
4067 ERR("Consumer type unknown");
4068 ret = -EINVAL;
4069 goto error;
4070 }
4071
4072 DBG2("Creating consumer directory: %s", path);
4073
4074 ret = mkdir(path, S_IRWXU | S_IRWXG);
4075 if (ret < 0) {
4076 if (errno != EEXIST) {
4077 ERR("Failed to create %s", path);
4078 goto error;
4079 }
4080 ret = 0;
4081 }
4082
4083 /* Create the kconsumerd error unix socket */
4084 consumer_data->err_sock =
4085 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4086 if (consumer_data->err_sock < 0) {
4087 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4088 ret = -1;
4089 goto error;
4090 }
4091
4092 /* File permission MUST be 660 */
4093 ret = chmod(consumer_data->err_unix_sock_path,
4094 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4095 if (ret < 0) {
4096 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4097 PERROR("chmod");
4098 goto error;
4099 }
4100
4101 error:
4102 return ret;
4103 }
4104
4105 /*
4106 * Signal handler for the daemon
4107 *
4108 * Simply stop all worker threads, leaving main() return gracefully after
4109 * joining all threads and calling cleanup().
4110 */
4111 static void sighandler(int sig)
4112 {
4113 switch (sig) {
4114 case SIGPIPE:
4115 DBG("SIGPIPE catched");
4116 return;
4117 case SIGINT:
4118 DBG("SIGINT catched");
4119 stop_threads();
4120 break;
4121 case SIGTERM:
4122 DBG("SIGTERM catched");
4123 stop_threads();
4124 break;
4125 default:
4126 break;
4127 }
4128 }
4129
4130 /*
4131 * Setup signal handler for :
4132 * SIGINT, SIGTERM, SIGPIPE
4133 */
4134 static int set_signal_handler(void)
4135 {
4136 int ret = 0;
4137 struct sigaction sa;
4138 sigset_t sigset;
4139
4140 if ((ret = sigemptyset(&sigset)) < 0) {
4141 perror("sigemptyset");
4142 return ret;
4143 }
4144
4145 sa.sa_handler = sighandler;
4146 sa.sa_mask = sigset;
4147 sa.sa_flags = 0;
4148 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4149 perror("sigaction");
4150 return ret;
4151 }
4152
4153 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4154 perror("sigaction");
4155 return ret;
4156 }
4157
4158 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4159 perror("sigaction");
4160 return ret;
4161 }
4162
4163 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4164
4165 return ret;
4166 }
4167
4168 /*
4169 * Set open files limit to unlimited. This daemon can open a large number of
4170 * file descriptors in order to consumer multiple kernel traces.
4171 */
4172 static void set_ulimit(void)
4173 {
4174 int ret;
4175 struct rlimit lim;
4176
4177 /* The kernel does not allowed an infinite limit for open files */
4178 lim.rlim_cur = 65535;
4179 lim.rlim_max = 65535;
4180
4181 ret = setrlimit(RLIMIT_NOFILE, &lim);
4182 if (ret < 0) {
4183 perror("failed to set open files limit");
4184 }
4185 }
4186
4187 /*
4188 * main
4189 */
4190 int main(int argc, char **argv)
4191 {
4192 int ret = 0;
4193 void *status;
4194 const char *home_path;
4195
4196 rcu_register_thread();
4197
4198 /* Create thread quit pipe */
4199 if ((ret = init_thread_quit_pipe()) < 0) {
4200 goto error;
4201 }
4202
4203 setup_consumerd_path();
4204
4205 /* Parse arguments */
4206 progname = argv[0];
4207 if ((ret = parse_args(argc, argv) < 0)) {
4208 goto error;
4209 }
4210
4211 /* Daemonize */
4212 if (opt_daemon) {
4213 ret = daemon(0, 0);
4214 if (ret < 0) {
4215 perror("daemon");
4216 goto error;
4217 }
4218 }
4219
4220 /* Check if daemon is UID = 0 */
4221 is_root = !getuid();
4222
4223 if (is_root) {
4224 rundir = strdup(LTTNG_RUNDIR);
4225
4226 /* Create global run dir with root access */
4227 ret = create_lttng_rundir(rundir);
4228 if (ret < 0) {
4229 goto error;
4230 }
4231
4232 if (strlen(apps_unix_sock_path) == 0) {
4233 snprintf(apps_unix_sock_path, PATH_MAX,
4234 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4235 }
4236
4237 if (strlen(client_unix_sock_path) == 0) {
4238 snprintf(client_unix_sock_path, PATH_MAX,
4239 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4240 }
4241
4242 /* Set global SHM for ust */
4243 if (strlen(wait_shm_path) == 0) {
4244 snprintf(wait_shm_path, PATH_MAX,
4245 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4246 }
4247
4248 /* Setup kernel consumerd path */
4249 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4250 KCONSUMERD_ERR_SOCK_PATH, rundir);
4251 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4252 KCONSUMERD_CMD_SOCK_PATH, rundir);
4253
4254 DBG2("Kernel consumer err path: %s",
4255 kconsumer_data.err_unix_sock_path);
4256 DBG2("Kernel consumer cmd path: %s",
4257 kconsumer_data.cmd_unix_sock_path);
4258 } else {
4259 home_path = get_home_dir();
4260 if (home_path == NULL) {
4261 /* TODO: Add --socket PATH option */
4262 ERR("Can't get HOME directory for sockets creation.");
4263 ret = -EPERM;
4264 goto error;
4265 }
4266
4267 /*
4268 * Create rundir from home path. This will create something like
4269 * $HOME/.lttng
4270 */
4271 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4272 if (ret < 0) {
4273 ret = -ENOMEM;
4274 goto error;
4275 }
4276
4277 ret = create_lttng_rundir(rundir);
4278 if (ret < 0) {
4279 goto error;
4280 }
4281
4282 if (strlen(apps_unix_sock_path) == 0) {
4283 snprintf(apps_unix_sock_path, PATH_MAX,
4284 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4285 }
4286
4287 /* Set the cli tool unix socket path */
4288 if (strlen(client_unix_sock_path) == 0) {
4289 snprintf(client_unix_sock_path, PATH_MAX,
4290 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4291 }
4292
4293 /* Set global SHM for ust */
4294 if (strlen(wait_shm_path) == 0) {
4295 snprintf(wait_shm_path, PATH_MAX,
4296 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4297 }
4298 }
4299
4300 DBG("Client socket path %s", client_unix_sock_path);
4301 DBG("Application socket path %s", apps_unix_sock_path);
4302 DBG("LTTng run directory path: %s", rundir);
4303
4304 /* 32 bits consumerd path setup */
4305 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4306 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4307 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4308 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4309
4310 DBG2("UST consumer 32 bits err path: %s",
4311 ustconsumer32_data.err_unix_sock_path);
4312 DBG2("UST consumer 32 bits cmd path: %s",
4313 ustconsumer32_data.cmd_unix_sock_path);
4314
4315 /* 64 bits consumerd path setup */
4316 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4317 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4318 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4319 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4320
4321 DBG2("UST consumer 64 bits err path: %s",
4322 ustconsumer64_data.err_unix_sock_path);
4323 DBG2("UST consumer 64 bits cmd path: %s",
4324 ustconsumer64_data.cmd_unix_sock_path);
4325
4326 /*
4327 * See if daemon already exist.
4328 */
4329 if ((ret = check_existing_daemon()) < 0) {
4330 ERR("Already running daemon.\n");
4331 /*
4332 * We do not goto exit because we must not cleanup()
4333 * because a daemon is already running.
4334 */
4335 goto error;
4336 }
4337
4338 /* After this point, we can safely call cleanup() with "goto exit" */
4339
4340 /*
4341 * These actions must be executed as root. We do that *after* setting up
4342 * the sockets path because we MUST make the check for another daemon using
4343 * those paths *before* trying to set the kernel consumer sockets and init
4344 * kernel tracer.
4345 */
4346 if (is_root) {
4347 ret = set_consumer_sockets(&kconsumer_data, rundir);
4348 if (ret < 0) {
4349 goto exit;
4350 }
4351
4352 /* Setup kernel tracer */
4353 if (!opt_no_kernel) {
4354 init_kernel_tracer();
4355 }
4356
4357 /* Set ulimit for open files */
4358 set_ulimit();
4359 }
4360
4361 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4362 if (ret < 0) {
4363 goto exit;
4364 }
4365
4366 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4367 if (ret < 0) {
4368 goto exit;
4369 }
4370
4371 if ((ret = set_signal_handler()) < 0) {
4372 goto exit;
4373 }
4374
4375 /* Setup the needed unix socket */
4376 if ((ret = init_daemon_socket()) < 0) {
4377 goto exit;
4378 }
4379
4380 /* Set credentials to socket */
4381 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4382 goto exit;
4383 }
4384
4385 /* Get parent pid if -S, --sig-parent is specified. */
4386 if (opt_sig_parent) {
4387 ppid = getppid();
4388 }
4389
4390 /* Setup the kernel pipe for waking up the kernel thread */
4391 if ((ret = create_kernel_poll_pipe()) < 0) {
4392 goto exit;
4393 }
4394
4395 /* Setup the thread apps communication pipe. */
4396 if ((ret = create_apps_cmd_pipe()) < 0) {
4397 goto exit;
4398 }
4399
4400 /* Init UST command queue. */
4401 cds_wfq_init(&ust_cmd_queue.queue);
4402
4403 /* Init UST app hash table */
4404 ust_app_ht_alloc();
4405
4406 /*
4407 * Get session list pointer. This pointer MUST NOT be free(). This list is
4408 * statically declared in session.c
4409 */
4410 session_list_ptr = session_get_list();
4411
4412 /* Set up max poll set size */
4413 lttng_poll_set_max_size();
4414
4415 /* Create thread to manage the client socket */
4416 ret = pthread_create(&client_thread, NULL,
4417 thread_manage_clients, (void *) NULL);
4418 if (ret != 0) {
4419 perror("pthread_create clients");
4420 goto exit_client;
4421 }
4422
4423 /* Create thread to dispatch registration */
4424 ret = pthread_create(&dispatch_thread, NULL,
4425 thread_dispatch_ust_registration, (void *) NULL);
4426 if (ret != 0) {
4427 perror("pthread_create dispatch");
4428 goto exit_dispatch;
4429 }
4430
4431 /* Create thread to manage application registration. */
4432 ret = pthread_create(&reg_apps_thread, NULL,
4433 thread_registration_apps, (void *) NULL);
4434 if (ret != 0) {
4435 perror("pthread_create registration");
4436 goto exit_reg_apps;
4437 }
4438
4439 /* Create thread to manage application socket */
4440 ret = pthread_create(&apps_thread, NULL,
4441 thread_manage_apps, (void *) NULL);
4442 if (ret != 0) {
4443 perror("pthread_create apps");
4444 goto exit_apps;
4445 }
4446
4447 /* Create kernel thread to manage kernel event */
4448 ret = pthread_create(&kernel_thread, NULL,
4449 thread_manage_kernel, (void *) NULL);
4450 if (ret != 0) {
4451 perror("pthread_create kernel");
4452 goto exit_kernel;
4453 }
4454
4455 ret = pthread_join(kernel_thread, &status);
4456 if (ret != 0) {
4457 perror("pthread_join");
4458 goto error; /* join error, exit without cleanup */
4459 }
4460
4461 exit_kernel:
4462 ret = pthread_join(apps_thread, &status);
4463 if (ret != 0) {
4464 perror("pthread_join");
4465 goto error; /* join error, exit without cleanup */
4466 }
4467
4468 exit_apps:
4469 ret = pthread_join(reg_apps_thread, &status);
4470 if (ret != 0) {
4471 perror("pthread_join");
4472 goto error; /* join error, exit without cleanup */
4473 }
4474
4475 exit_reg_apps:
4476 ret = pthread_join(dispatch_thread, &status);
4477 if (ret != 0) {
4478 perror("pthread_join");
4479 goto error; /* join error, exit without cleanup */
4480 }
4481
4482 exit_dispatch:
4483 ret = pthread_join(client_thread, &status);
4484 if (ret != 0) {
4485 perror("pthread_join");
4486 goto error; /* join error, exit without cleanup */
4487 }
4488
4489 ret = join_consumer_thread(&kconsumer_data);
4490 if (ret != 0) {
4491 perror("join_consumer");
4492 goto error; /* join error, exit without cleanup */
4493 }
4494
4495 exit_client:
4496 exit:
4497 /*
4498 * cleanup() is called when no other thread is running.
4499 */
4500 rcu_thread_online();
4501 cleanup();
4502 rcu_thread_offline();
4503 rcu_unregister_thread();
4504 if (!ret) {
4505 exit(EXIT_SUCCESS);
4506 }
4507 error:
4508 exit(EXIT_FAILURE);
4509 }
LTTng 2.0 tools and control repository
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