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93417bca04fe213276ed88189d07e11e72a404b3
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearing down session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearing down session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all sessions");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
425 }
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
429
430 /* <fun> */
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
435 }
436
437 /*
438 * Send data on a unix socket using the liblttsessiondcomm API.
439 *
440 * Return lttcomm error code.
441 */
442 static int send_unix_sock(int sock, void *buf, size_t len)
443 {
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450 }
451
452 /*
453 * Free memory of a command context structure.
454 */
455 static void clean_command_ctx(struct command_ctx **cmd_ctx)
456 {
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
461 }
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
464 }
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
467 }
468 }
469
470 /*
471 * Send all stream fds of kernel channel to the consumer.
472 */
473 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
476 {
477 int ret;
478 struct ltt_kernel_stream *stream;
479 struct lttcomm_consumer_msg lkm;
480
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel->channel->name);
483
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
491 if (ret < 0) {
492 perror("send consumer channel");
493 goto error;
494 }
495
496 /* Send streams */
497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
521 }
522 }
523
524 DBG("consumer channel streams sent");
525
526 return 0;
527
528 error:
529 return ret;
530 }
531
532 /*
533 * Send all stream fds of the kernel session to the consumer.
534 */
535 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
536 struct ltt_kernel_session *session)
537 {
538 int ret;
539 struct ltt_kernel_channel *chan;
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
542
543 DBG("Sending metadata stream fd");
544
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session->consumer_fd == 0) {
547 session->consumer_fd = consumer_data->cmd_sock;
548 }
549
550 if (session->metadata_stream_fd != 0) {
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
581 if (ret < 0) {
582 perror("send consumer stream");
583 goto error;
584 }
585 }
586
587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599 error:
600 return ret;
601 }
602
603 /*
604 * Notify UST applications using the shm mmap futex.
605 */
606 static int notify_ust_apps(int active)
607 {
608 char *wait_shm_mmap;
609
610 DBG("Notifying applications of session daemon state: %d", active);
611
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
615 goto error;
616 }
617
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
623
624 error:
625 return -1;
626 }
627
628 /*
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
632 *
633 * Return total size of the buffer pointed by buf.
634 */
635 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
636 {
637 int ret, buf_size;
638
639 buf_size = size;
640
641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
642 if (cmd_ctx->llm == NULL) {
643 perror("zmalloc");
644 ret = -ENOMEM;
645 goto error;
646 }
647
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
651
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
655 return buf_size;
656
657 error:
658 return ret;
659 }
660
661 /*
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
664 */
665 static int update_kernel_poll(struct lttng_poll_event *events)
666 {
667 int ret;
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
671 DBG("Updating kernel poll set");
672
673 session_lock_list();
674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
675 session_lock(session);
676 if (session->kernel_session == NULL) {
677 session_unlock(session);
678 continue;
679 }
680
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
686 session_unlock(session);
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
690 }
691 session_unlock(session);
692 }
693 session_unlock_list();
694
695 return 0;
696
697 error:
698 session_unlock_list();
699 return -1;
700 }
701
702 /*
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
705 *
706 * Useful for CPU hotplug feature.
707 */
708 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
709 {
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
716 session_lock_list();
717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
718 session_lock(session);
719 if (session->kernel_session == NULL) {
720 session_unlock(session);
721 continue;
722 }
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
735 goto error;
736 }
737
738 /*
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
742 */
743 if (session->kernel_session->consumer_fds_sent == 1) {
744 ret = send_kconsumer_channel_streams(consumer_data,
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
747 if (ret < 0) {
748 goto error;
749 }
750 }
751 goto error;
752 }
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757 return ret;
758
759 error:
760 session_unlock(session);
761 session_unlock_list();
762 return ret;
763 }
764
765 /*
766 * For each tracing session, update newly registered apps.
767 */
768 static void update_ust_app(int app_sock)
769 {
770 struct ltt_session *sess, *stmp;
771
772 session_lock_list();
773
774 /* For all tracing session(s) */
775 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
776 session_lock(sess);
777 if (sess->ust_session) {
778 ust_app_global_update(sess->ust_session, app_sock);
779 }
780 session_unlock(sess);
781 }
782
783 session_unlock_list();
784 }
785
786 /*
787 * This thread manage event coming from the kernel.
788 *
789 * Features supported in this thread:
790 * -) CPU Hotplug
791 */
792 static void *thread_manage_kernel(void *data)
793 {
794 int ret, i, pollfd, update_poll_flag = 1;
795 uint32_t revents, nb_fd;
796 char tmp;
797 struct lttng_poll_event events;
798
799 DBG("Thread manage kernel started");
800
801 ret = create_thread_poll_set(&events, 2);
802 if (ret < 0) {
803 goto error;
804 }
805
806 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
807 if (ret < 0) {
808 goto error;
809 }
810
811 while (1) {
812 if (update_poll_flag == 1) {
813 /*
814 * Reset number of fd in the poll set. Always 2 since there is the thread
815 * quit pipe and the kernel pipe.
816 */
817 events.nb_fd = 2;
818
819 ret = update_kernel_poll(&events);
820 if (ret < 0) {
821 goto error;
822 }
823 update_poll_flag = 0;
824 }
825
826 nb_fd = LTTNG_POLL_GETNB(&events);
827
828 DBG("Thread kernel polling on %d fds", nb_fd);
829
830 /* Zeroed the poll events */
831 lttng_poll_reset(&events);
832
833 /* Poll infinite value of time */
834 restart:
835 ret = lttng_poll_wait(&events, -1);
836 if (ret < 0) {
837 /*
838 * Restart interrupted system call.
839 */
840 if (errno == EINTR) {
841 goto restart;
842 }
843 goto error;
844 } else if (ret == 0) {
845 /* Should not happen since timeout is infinite */
846 ERR("Return value of poll is 0 with an infinite timeout.\n"
847 "This should not have happened! Continuing...");
848 continue;
849 }
850
851 for (i = 0; i < nb_fd; i++) {
852 /* Fetch once the poll data */
853 revents = LTTNG_POLL_GETEV(&events, i);
854 pollfd = LTTNG_POLL_GETFD(&events, i);
855
856 /* Thread quit pipe has been closed. Killing thread. */
857 ret = check_thread_quit_pipe(pollfd, revents);
858 if (ret) {
859 goto error;
860 }
861
862 /* Check for data on kernel pipe */
863 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
864 ret = read(kernel_poll_pipe[0], &tmp, 1);
865 update_poll_flag = 1;
866 continue;
867 } else {
868 /*
869 * New CPU detected by the kernel. Adding kernel stream to
870 * kernel session and updating the kernel consumer
871 */
872 if (revents & LPOLLIN) {
873 ret = update_kernel_stream(&kconsumer_data, pollfd);
874 if (ret < 0) {
875 continue;
876 }
877 break;
878 /*
879 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
880 * and unregister kernel stream at this point.
881 */
882 }
883 }
884 }
885 }
886
887 error:
888 DBG("Kernel thread dying");
889 close(kernel_poll_pipe[0]);
890 close(kernel_poll_pipe[1]);
891
892 lttng_poll_clean(&events);
893
894 return NULL;
895 }
896
897 /*
898 * This thread manage the consumer error sent back to the session daemon.
899 */
900 static void *thread_manage_consumer(void *data)
901 {
902 int sock = 0, i, ret, pollfd;
903 uint32_t revents, nb_fd;
904 enum lttcomm_return_code code;
905 struct lttng_poll_event events;
906 struct consumer_data *consumer_data = data;
907
908 DBG("[thread] Manage consumer started");
909
910 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
911 if (ret < 0) {
912 goto error;
913 }
914
915 /*
916 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
917 * Nothing more will be added to this poll set.
918 */
919 ret = create_thread_poll_set(&events, 2);
920 if (ret < 0) {
921 goto error;
922 }
923
924 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
925 if (ret < 0) {
926 goto error;
927 }
928
929 nb_fd = LTTNG_POLL_GETNB(&events);
930
931 /* Inifinite blocking call, waiting for transmission */
932 restart:
933 ret = lttng_poll_wait(&events, -1);
934 if (ret < 0) {
935 /*
936 * Restart interrupted system call.
937 */
938 if (errno == EINTR) {
939 goto restart;
940 }
941 goto error;
942 }
943
944 for (i = 0; i < nb_fd; i++) {
945 /* Fetch once the poll data */
946 revents = LTTNG_POLL_GETEV(&events, i);
947 pollfd = LTTNG_POLL_GETFD(&events, i);
948
949 /* Thread quit pipe has been closed. Killing thread. */
950 ret = check_thread_quit_pipe(pollfd, revents);
951 if (ret) {
952 goto error;
953 }
954
955 /* Event on the registration socket */
956 if (pollfd == consumer_data->err_sock) {
957 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
958 ERR("consumer err socket poll error");
959 goto error;
960 }
961 }
962 }
963
964 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
965 if (sock < 0) {
966 goto error;
967 }
968
969 DBG2("Receiving code from consumer err_sock");
970
971 /* Getting status code from kconsumerd */
972 ret = lttcomm_recv_unix_sock(sock, &code,
973 sizeof(enum lttcomm_return_code));
974 if (ret <= 0) {
975 goto error;
976 }
977
978 if (code == CONSUMERD_COMMAND_SOCK_READY) {
979 consumer_data->cmd_sock =
980 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
981 if (consumer_data->cmd_sock < 0) {
982 sem_post(&consumer_data->sem);
983 PERROR("consumer connect");
984 goto error;
985 }
986 /* Signal condition to tell that the kconsumerd is ready */
987 sem_post(&consumer_data->sem);
988 DBG("consumer command socket ready");
989 } else {
990 ERR("consumer error when waiting for SOCK_READY : %s",
991 lttcomm_get_readable_code(-code));
992 goto error;
993 }
994
995 /* Remove the kconsumerd error sock since we've established a connexion */
996 ret = lttng_poll_del(&events, consumer_data->err_sock);
997 if (ret < 0) {
998 goto error;
999 }
1000
1001 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1002 if (ret < 0) {
1003 goto error;
1004 }
1005
1006 /* Update number of fd */
1007 nb_fd = LTTNG_POLL_GETNB(&events);
1008
1009 /* Inifinite blocking call, waiting for transmission */
1010 restart_poll:
1011 ret = lttng_poll_wait(&events, -1);
1012 if (ret < 0) {
1013 /*
1014 * Restart interrupted system call.
1015 */
1016 if (errno == EINTR) {
1017 goto restart_poll;
1018 }
1019 goto error;
1020 }
1021
1022 for (i = 0; i < nb_fd; i++) {
1023 /* Fetch once the poll data */
1024 revents = LTTNG_POLL_GETEV(&events, i);
1025 pollfd = LTTNG_POLL_GETFD(&events, i);
1026
1027 /* Thread quit pipe has been closed. Killing thread. */
1028 ret = check_thread_quit_pipe(pollfd, revents);
1029 if (ret) {
1030 goto error;
1031 }
1032
1033 /* Event on the kconsumerd socket */
1034 if (pollfd == sock) {
1035 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1036 ERR("consumer err socket second poll error");
1037 goto error;
1038 }
1039 }
1040 }
1041
1042 /* Wait for any kconsumerd error */
1043 ret = lttcomm_recv_unix_sock(sock, &code,
1044 sizeof(enum lttcomm_return_code));
1045 if (ret <= 0) {
1046 ERR("consumer closed the command socket");
1047 goto error;
1048 }
1049
1050 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1051
1052 error:
1053 DBG("consumer thread dying");
1054 close(consumer_data->err_sock);
1055 close(consumer_data->cmd_sock);
1056 close(sock);
1057
1058 unlink(consumer_data->err_unix_sock_path);
1059 unlink(consumer_data->cmd_unix_sock_path);
1060 consumer_data->pid = 0;
1061
1062 lttng_poll_clean(&events);
1063
1064 return NULL;
1065 }
1066
1067 /*
1068 * This thread manage application communication.
1069 */
1070 static void *thread_manage_apps(void *data)
1071 {
1072 int i, ret, pollfd;
1073 uint32_t revents, nb_fd;
1074 struct ust_command ust_cmd;
1075 struct lttng_poll_event events;
1076
1077 DBG("[thread] Manage application started");
1078
1079 rcu_register_thread();
1080 rcu_thread_online();
1081
1082 ret = create_thread_poll_set(&events, 2);
1083 if (ret < 0) {
1084 goto error;
1085 }
1086
1087 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1088 if (ret < 0) {
1089 goto error;
1090 }
1091
1092 while (1) {
1093 /* Zeroed the events structure */
1094 lttng_poll_reset(&events);
1095
1096 nb_fd = LTTNG_POLL_GETNB(&events);
1097
1098 DBG("Apps thread polling on %d fds", nb_fd);
1099
1100 /* Inifinite blocking call, waiting for transmission */
1101 restart:
1102 ret = lttng_poll_wait(&events, -1);
1103 if (ret < 0) {
1104 /*
1105 * Restart interrupted system call.
1106 */
1107 if (errno == EINTR) {
1108 goto restart;
1109 }
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Validate UST version compatibility.
1148 */
1149 ret = ust_app_validate_version(ust_cmd.sock);
1150 if (ret >= 0) {
1151 /*
1152 * Add channel(s) and event(s) to newly registered apps
1153 * from lttng global UST domain.
1154 */
1155 update_ust_app(ust_cmd.sock);
1156 }
1157
1158 ret = ust_app_register_done(ust_cmd.sock);
1159 if (ret < 0) {
1160 /*
1161 * If the registration is not possible, we simply
1162 * unregister the apps and continue
1163 */
1164 ust_app_unregister(ust_cmd.sock);
1165 } else {
1166 /*
1167 * We just need here to monitor the close of the UST
1168 * socket and poll set monitor those by default.
1169 */
1170 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1171 if (ret < 0) {
1172 goto error;
1173 }
1174
1175 DBG("Apps with sock %d added to poll set",
1176 ust_cmd.sock);
1177 }
1178
1179 break;
1180 }
1181 } else {
1182 /*
1183 * At this point, we know that a registered application made
1184 * the event at poll_wait.
1185 */
1186 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1187 /* Removing from the poll set */
1188 ret = lttng_poll_del(&events, pollfd);
1189 if (ret < 0) {
1190 goto error;
1191 }
1192
1193 /* Socket closed on remote end. */
1194 ust_app_unregister(pollfd);
1195 break;
1196 }
1197 }
1198 }
1199 }
1200
1201 error:
1202 DBG("Application communication apps dying");
1203 close(apps_cmd_pipe[0]);
1204 close(apps_cmd_pipe[1]);
1205
1206 lttng_poll_clean(&events);
1207
1208 rcu_thread_offline();
1209 rcu_unregister_thread();
1210 return NULL;
1211 }
1212
1213 /*
1214 * Dispatch request from the registration threads to the application
1215 * communication thread.
1216 */
1217 static void *thread_dispatch_ust_registration(void *data)
1218 {
1219 int ret;
1220 struct cds_wfq_node *node;
1221 struct ust_command *ust_cmd = NULL;
1222
1223 DBG("[thread] Dispatch UST command started");
1224
1225 while (!dispatch_thread_exit) {
1226 /* Atomically prepare the queue futex */
1227 futex_nto1_prepare(&ust_cmd_queue.futex);
1228
1229 do {
1230 /* Dequeue command for registration */
1231 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1232 if (node == NULL) {
1233 DBG("Woken up but nothing in the UST command queue");
1234 /* Continue thread execution */
1235 break;
1236 }
1237
1238 ust_cmd = caa_container_of(node, struct ust_command, node);
1239
1240 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1241 " gid:%d sock:%d name:%s (version %d.%d)",
1242 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1243 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1244 ust_cmd->sock, ust_cmd->reg_msg.name,
1245 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1246 /*
1247 * Inform apps thread of the new application registration. This
1248 * call is blocking so we can be assured that the data will be read
1249 * at some point in time or wait to the end of the world :)
1250 */
1251 ret = write(apps_cmd_pipe[1], ust_cmd,
1252 sizeof(struct ust_command));
1253 if (ret < 0) {
1254 perror("write apps cmd pipe");
1255 if (errno == EBADF) {
1256 /*
1257 * We can't inform the application thread to process
1258 * registration. We will exit or else application
1259 * registration will not occur and tracing will never
1260 * start.
1261 */
1262 goto error;
1263 }
1264 }
1265 free(ust_cmd);
1266 } while (node != NULL);
1267
1268 /* Futex wait on queue. Blocking call on futex() */
1269 futex_nto1_wait(&ust_cmd_queue.futex);
1270 }
1271
1272 error:
1273 DBG("Dispatch thread dying");
1274 return NULL;
1275 }
1276
1277 /*
1278 * This thread manage application registration.
1279 */
1280 static void *thread_registration_apps(void *data)
1281 {
1282 int sock = 0, i, ret, pollfd;
1283 uint32_t revents, nb_fd;
1284 struct lttng_poll_event events;
1285 /*
1286 * Get allocated in this thread, enqueued to a global queue, dequeued and
1287 * freed in the manage apps thread.
1288 */
1289 struct ust_command *ust_cmd = NULL;
1290
1291 DBG("[thread] Manage application registration started");
1292
1293 ret = lttcomm_listen_unix_sock(apps_sock);
1294 if (ret < 0) {
1295 goto error;
1296 }
1297
1298 /*
1299 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1300 * more will be added to this poll set.
1301 */
1302 ret = create_thread_poll_set(&events, 2);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Add the application registration socket */
1308 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1309 if (ret < 0) {
1310 goto error;
1311 }
1312
1313 /* Notify all applications to register */
1314 ret = notify_ust_apps(1);
1315 if (ret < 0) {
1316 ERR("Failed to notify applications or create the wait shared memory.\n"
1317 "Execution continues but there might be problem for already\n"
1318 "running applications that wishes to register.");
1319 }
1320
1321 while (1) {
1322 DBG("Accepting application registration");
1323
1324 nb_fd = LTTNG_POLL_GETNB(&events);
1325
1326 /* Inifinite blocking call, waiting for transmission */
1327 restart:
1328 ret = lttng_poll_wait(&events, -1);
1329 if (ret < 0) {
1330 /*
1331 * Restart interrupted system call.
1332 */
1333 if (errno == EINTR) {
1334 goto restart;
1335 }
1336 goto error;
1337 }
1338
1339 for (i = 0; i < nb_fd; i++) {
1340 /* Fetch once the poll data */
1341 revents = LTTNG_POLL_GETEV(&events, i);
1342 pollfd = LTTNG_POLL_GETFD(&events, i);
1343
1344 /* Thread quit pipe has been closed. Killing thread. */
1345 ret = check_thread_quit_pipe(pollfd, revents);
1346 if (ret) {
1347 goto error;
1348 }
1349
1350 /* Event on the registration socket */
1351 if (pollfd == apps_sock) {
1352 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1353 ERR("Register apps socket poll error");
1354 goto error;
1355 } else if (revents & LPOLLIN) {
1356 sock = lttcomm_accept_unix_sock(apps_sock);
1357 if (sock < 0) {
1358 goto error;
1359 }
1360
1361 /* Create UST registration command for enqueuing */
1362 ust_cmd = zmalloc(sizeof(struct ust_command));
1363 if (ust_cmd == NULL) {
1364 perror("ust command zmalloc");
1365 goto error;
1366 }
1367
1368 /*
1369 * Using message-based transmissions to ensure we don't
1370 * have to deal with partially received messages.
1371 */
1372 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1373 sizeof(struct ust_register_msg));
1374 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1375 if (ret < 0) {
1376 perror("lttcomm_recv_unix_sock register apps");
1377 } else {
1378 ERR("Wrong size received on apps register");
1379 }
1380 free(ust_cmd);
1381 close(sock);
1382 continue;
1383 }
1384
1385 ust_cmd->sock = sock;
1386
1387 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1388 " gid:%d sock:%d name:%s (version %d.%d)",
1389 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1390 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1391 ust_cmd->sock, ust_cmd->reg_msg.name,
1392 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1393
1394 /*
1395 * Lock free enqueue the registration request. The red pill
1396 * has been taken! This apps will be part of the *system*.
1397 */
1398 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1399
1400 /*
1401 * Wake the registration queue futex. Implicit memory
1402 * barrier with the exchange in cds_wfq_enqueue.
1403 */
1404 futex_nto1_wake(&ust_cmd_queue.futex);
1405 }
1406 }
1407 }
1408 }
1409
1410 error:
1411 DBG("UST Registration thread dying");
1412
1413 /* Notify that the registration thread is gone */
1414 notify_ust_apps(0);
1415
1416 close(apps_sock);
1417 close(sock);
1418 unlink(apps_unix_sock_path);
1419
1420 lttng_poll_clean(&events);
1421
1422 return NULL;
1423 }
1424
1425 /*
1426 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1427 * exec or it will fails.
1428 */
1429 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1430 {
1431 int ret;
1432 struct timespec timeout;
1433
1434 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1435 timeout.tv_nsec = 0;
1436
1437 /* Setup semaphore */
1438 ret = sem_init(&consumer_data->sem, 0, 0);
1439 if (ret < 0) {
1440 PERROR("sem_init consumer semaphore");
1441 goto error;
1442 }
1443
1444 ret = pthread_create(&consumer_data->thread, NULL,
1445 thread_manage_consumer, consumer_data);
1446 if (ret != 0) {
1447 PERROR("pthread_create consumer");
1448 ret = -1;
1449 goto error;
1450 }
1451
1452 /* Get time for sem_timedwait absolute timeout */
1453 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1454 if (ret < 0) {
1455 PERROR("clock_gettime spawn consumer");
1456 /* Infinite wait for the kconsumerd thread to be ready */
1457 ret = sem_wait(&consumer_data->sem);
1458 } else {
1459 /* Normal timeout if the gettime was successful */
1460 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1461 ret = sem_timedwait(&consumer_data->sem, &timeout);
1462 }
1463
1464 if (ret < 0) {
1465 if (errno == ETIMEDOUT) {
1466 /*
1467 * Call has timed out so we kill the kconsumerd_thread and return
1468 * an error.
1469 */
1470 ERR("The consumer thread was never ready. Killing it");
1471 ret = pthread_cancel(consumer_data->thread);
1472 if (ret < 0) {
1473 PERROR("pthread_cancel consumer thread");
1474 }
1475 } else {
1476 PERROR("semaphore wait failed consumer thread");
1477 }
1478 goto error;
1479 }
1480
1481 pthread_mutex_lock(&consumer_data->pid_mutex);
1482 if (consumer_data->pid == 0) {
1483 ERR("Kconsumerd did not start");
1484 pthread_mutex_unlock(&consumer_data->pid_mutex);
1485 goto error;
1486 }
1487 pthread_mutex_unlock(&consumer_data->pid_mutex);
1488
1489 return 0;
1490
1491 error:
1492 return ret;
1493 }
1494
1495 /*
1496 * Join consumer thread
1497 */
1498 static int join_consumer_thread(struct consumer_data *consumer_data)
1499 {
1500 void *status;
1501 int ret;
1502
1503 if (consumer_data->pid != 0) {
1504 ret = kill(consumer_data->pid, SIGTERM);
1505 if (ret) {
1506 ERR("Error killing consumer daemon");
1507 return ret;
1508 }
1509 return pthread_join(consumer_data->thread, &status);
1510 } else {
1511 return 0;
1512 }
1513 }
1514
1515 /*
1516 * Fork and exec a consumer daemon (consumerd).
1517 *
1518 * Return pid if successful else -1.
1519 */
1520 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1521 {
1522 int ret;
1523 pid_t pid;
1524 const char *consumer_to_use;
1525 const char *verbosity;
1526 struct stat st;
1527
1528 DBG("Spawning consumerd");
1529
1530 pid = fork();
1531 if (pid == 0) {
1532 /*
1533 * Exec consumerd.
1534 */
1535 if (opt_verbose_consumer) {
1536 verbosity = "--verbose";
1537 } else {
1538 verbosity = "--quiet";
1539 }
1540 switch (consumer_data->type) {
1541 case LTTNG_CONSUMER_KERNEL:
1542 /*
1543 * Find out which consumerd to execute. We will first try the
1544 * 64-bit path, then the sessiond's installation directory, and
1545 * fallback on the 32-bit one,
1546 */
1547 DBG3("Looking for a kernel consumer at these locations:");
1548 DBG3(" 1) %s", consumerd64_bin);
1549 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1550 DBG3(" 3) %s", consumerd32_bin);
1551 if (stat(consumerd64_bin, &st) == 0) {
1552 DBG3("Found location #1");
1553 consumer_to_use = consumerd64_bin;
1554 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1555 DBG3("Found location #2");
1556 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1557 } else if (stat(consumerd32_bin, &st) == 0) {
1558 DBG3("Found location #3");
1559 consumer_to_use = consumerd32_bin;
1560 } else {
1561 DBG("Could not find any valid consumerd executable");
1562 break;
1563 }
1564 DBG("Using kernel consumer at: %s", consumer_to_use);
1565 execl(consumer_to_use,
1566 "lttng-consumerd", verbosity, "-k",
1567 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1568 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1569 NULL);
1570 break;
1571 case LTTNG_CONSUMER64_UST:
1572 {
1573 char *tmpnew = NULL;
1574
1575 if (consumerd64_libdir[0] != '\0') {
1576 char *tmp;
1577 size_t tmplen;
1578
1579 tmp = getenv("LD_LIBRARY_PATH");
1580 if (!tmp) {
1581 tmp = "";
1582 }
1583 tmplen = strlen("LD_LIBRARY_PATH=")
1584 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1585 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1586 if (!tmpnew) {
1587 ret = -ENOMEM;
1588 goto error;
1589 }
1590 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1591 strcat(tmpnew, consumerd64_libdir);
1592 if (tmp[0] != '\0') {
1593 strcat(tmpnew, ":");
1594 strcat(tmpnew, tmp);
1595 }
1596 ret = putenv(tmpnew);
1597 if (ret) {
1598 ret = -errno;
1599 goto error;
1600 }
1601 }
1602 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1603 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1604 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1605 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1606 NULL);
1607 if (consumerd64_libdir[0] != '\0') {
1608 free(tmpnew);
1609 }
1610 if (ret) {
1611 goto error;
1612 }
1613 break;
1614 }
1615 case LTTNG_CONSUMER32_UST:
1616 {
1617 char *tmpnew = NULL;
1618
1619 if (consumerd32_libdir[0] != '\0') {
1620 char *tmp;
1621 size_t tmplen;
1622
1623 tmp = getenv("LD_LIBRARY_PATH");
1624 if (!tmp) {
1625 tmp = "";
1626 }
1627 tmplen = strlen("LD_LIBRARY_PATH=")
1628 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1629 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1630 if (!tmpnew) {
1631 ret = -ENOMEM;
1632 goto error;
1633 }
1634 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1635 strcat(tmpnew, consumerd32_libdir);
1636 if (tmp[0] != '\0') {
1637 strcat(tmpnew, ":");
1638 strcat(tmpnew, tmp);
1639 }
1640 ret = putenv(tmpnew);
1641 if (ret) {
1642 ret = -errno;
1643 goto error;
1644 }
1645 }
1646 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1647 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1648 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1649 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1650 NULL);
1651 if (consumerd32_libdir[0] != '\0') {
1652 free(tmpnew);
1653 }
1654 if (ret) {
1655 goto error;
1656 }
1657 break;
1658 }
1659 default:
1660 perror("unknown consumer type");
1661 exit(EXIT_FAILURE);
1662 }
1663 if (errno != 0) {
1664 perror("kernel start consumer exec");
1665 }
1666 exit(EXIT_FAILURE);
1667 } else if (pid > 0) {
1668 ret = pid;
1669 } else {
1670 perror("start consumer fork");
1671 ret = -errno;
1672 }
1673 error:
1674 return ret;
1675 }
1676
1677 /*
1678 * Spawn the consumerd daemon and session daemon thread.
1679 */
1680 static int start_consumerd(struct consumer_data *consumer_data)
1681 {
1682 int ret;
1683
1684 pthread_mutex_lock(&consumer_data->pid_mutex);
1685 if (consumer_data->pid != 0) {
1686 pthread_mutex_unlock(&consumer_data->pid_mutex);
1687 goto end;
1688 }
1689
1690 ret = spawn_consumerd(consumer_data);
1691 if (ret < 0) {
1692 ERR("Spawning consumerd failed");
1693 pthread_mutex_unlock(&consumer_data->pid_mutex);
1694 goto error;
1695 }
1696
1697 /* Setting up the consumer_data pid */
1698 consumer_data->pid = ret;
1699 DBG2("Consumer pid %d", consumer_data->pid);
1700 pthread_mutex_unlock(&consumer_data->pid_mutex);
1701
1702 DBG2("Spawning consumer control thread");
1703 ret = spawn_consumer_thread(consumer_data);
1704 if (ret < 0) {
1705 ERR("Fatal error spawning consumer control thread");
1706 goto error;
1707 }
1708
1709 end:
1710 return 0;
1711
1712 error:
1713 return ret;
1714 }
1715
1716 /*
1717 * Check version of the lttng-modules.
1718 */
1719 static int validate_lttng_modules_version(void)
1720 {
1721 return kernel_validate_version(kernel_tracer_fd);
1722 }
1723
1724 /*
1725 * Setup necessary data for kernel tracer action.
1726 */
1727 static int init_kernel_tracer(void)
1728 {
1729 int ret;
1730
1731 /* Modprobe lttng kernel modules */
1732 ret = modprobe_lttng_control();
1733 if (ret < 0) {
1734 goto error;
1735 }
1736
1737 /* Open debugfs lttng */
1738 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1739 if (kernel_tracer_fd < 0) {
1740 DBG("Failed to open %s", module_proc_lttng);
1741 ret = -1;
1742 goto error_open;
1743 }
1744
1745 /* Validate kernel version */
1746 ret = validate_lttng_modules_version();
1747 if (ret < 0) {
1748 goto error_version;
1749 }
1750
1751 ret = modprobe_lttng_data();
1752 if (ret < 0) {
1753 goto error_modules;
1754 }
1755
1756 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1757 return 0;
1758
1759 error_version:
1760 modprobe_remove_lttng_control();
1761 close(kernel_tracer_fd);
1762 kernel_tracer_fd = 0;
1763 return LTTCOMM_KERN_VERSION;
1764
1765 error_modules:
1766 close(kernel_tracer_fd);
1767
1768 error_open:
1769 modprobe_remove_lttng_control();
1770
1771 error:
1772 WARN("No kernel tracer available");
1773 kernel_tracer_fd = 0;
1774 return LTTCOMM_KERN_NA;
1775 }
1776
1777 /*
1778 * Init tracing by creating trace directory and sending fds kernel consumer.
1779 */
1780 static int init_kernel_tracing(struct ltt_kernel_session *session)
1781 {
1782 int ret = 0;
1783
1784 if (session->consumer_fds_sent == 0) {
1785 /*
1786 * Assign default kernel consumer socket if no consumer assigned to the
1787 * kernel session. At this point, it's NOT suppose to be 0 but this is
1788 * an extra security check.
1789 */
1790 if (session->consumer_fd == 0) {
1791 session->consumer_fd = kconsumer_data.cmd_sock;
1792 }
1793
1794 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1795 if (ret < 0) {
1796 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1797 goto error;
1798 }
1799
1800 session->consumer_fds_sent = 1;
1801 }
1802
1803 error:
1804 return ret;
1805 }
1806
1807 /*
1808 * Create an UST session and add it to the session ust list.
1809 */
1810 static int create_ust_session(struct ltt_session *session,
1811 struct lttng_domain *domain)
1812 {
1813 struct ltt_ust_session *lus = NULL;
1814 int ret;
1815
1816 switch (domain->type) {
1817 case LTTNG_DOMAIN_UST:
1818 break;
1819 default:
1820 ret = LTTCOMM_UNKNOWN_DOMAIN;
1821 goto error;
1822 }
1823
1824 DBG("Creating UST session");
1825
1826 lus = trace_ust_create_session(session->path, session->id, domain);
1827 if (lus == NULL) {
1828 ret = LTTCOMM_UST_SESS_FAIL;
1829 goto error;
1830 }
1831
1832 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1833 session->uid, session->gid);
1834 if (ret < 0) {
1835 if (ret != -EEXIST) {
1836 ERR("Trace directory creation error");
1837 ret = LTTCOMM_UST_SESS_FAIL;
1838 goto error;
1839 }
1840 }
1841
1842 /* The domain type dictate different actions on session creation */
1843 switch (domain->type) {
1844 case LTTNG_DOMAIN_UST:
1845 /* No ustctl for the global UST domain */
1846 break;
1847 default:
1848 ERR("Unknown UST domain on create session %d", domain->type);
1849 goto error;
1850 }
1851 lus->uid = session->uid;
1852 lus->gid = session->gid;
1853 session->ust_session = lus;
1854
1855 return LTTCOMM_OK;
1856
1857 error:
1858 free(lus);
1859 return ret;
1860 }
1861
1862 /*
1863 * Create a kernel tracer session then create the default channel.
1864 */
1865 static int create_kernel_session(struct ltt_session *session)
1866 {
1867 int ret;
1868
1869 DBG("Creating kernel session");
1870
1871 ret = kernel_create_session(session, kernel_tracer_fd);
1872 if (ret < 0) {
1873 ret = LTTCOMM_KERN_SESS_FAIL;
1874 goto error;
1875 }
1876
1877 /* Set kernel consumer socket fd */
1878 if (kconsumer_data.cmd_sock) {
1879 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1880 }
1881
1882 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1883 S_IRWXU | S_IRWXG, session->uid, session->gid);
1884 if (ret < 0) {
1885 if (ret != -EEXIST) {
1886 ERR("Trace directory creation error");
1887 goto error;
1888 }
1889 }
1890 session->kernel_session->uid = session->uid;
1891 session->kernel_session->gid = session->gid;
1892
1893 error:
1894 return ret;
1895 }
1896
1897 /*
1898 * Check if the UID or GID match the session. Root user has access to all
1899 * sessions.
1900 */
1901 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1902 {
1903 if (uid != session->uid && gid != session->gid && uid != 0) {
1904 return 0;
1905 } else {
1906 return 1;
1907 }
1908 }
1909
1910 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1911 {
1912 unsigned int i = 0;
1913 struct ltt_session *session;
1914
1915 DBG("Counting number of available session for UID %d GID %d",
1916 uid, gid);
1917 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1918 /*
1919 * Only list the sessions the user can control.
1920 */
1921 if (!session_access_ok(session, uid, gid)) {
1922 continue;
1923 }
1924 i++;
1925 }
1926 return i;
1927 }
1928
1929 /*
1930 * Using the session list, filled a lttng_session array to send back to the
1931 * client for session listing.
1932 *
1933 * The session list lock MUST be acquired before calling this function. Use
1934 * session_lock_list() and session_unlock_list().
1935 */
1936 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1937 gid_t gid)
1938 {
1939 unsigned int i = 0;
1940 struct ltt_session *session;
1941
1942 DBG("Getting all available session for UID %d GID %d",
1943 uid, gid);
1944 /*
1945 * Iterate over session list and append data after the control struct in
1946 * the buffer.
1947 */
1948 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1949 /*
1950 * Only list the sessions the user can control.
1951 */
1952 if (!session_access_ok(session, uid, gid)) {
1953 continue;
1954 }
1955 strncpy(sessions[i].path, session->path, PATH_MAX);
1956 sessions[i].path[PATH_MAX - 1] = '\0';
1957 strncpy(sessions[i].name, session->name, NAME_MAX);
1958 sessions[i].name[NAME_MAX - 1] = '\0';
1959 sessions[i].enabled = session->enabled;
1960 i++;
1961 }
1962 }
1963
1964 /*
1965 * Fill lttng_channel array of all channels.
1966 */
1967 static void list_lttng_channels(int domain, struct ltt_session *session,
1968 struct lttng_channel *channels)
1969 {
1970 int i = 0;
1971 struct ltt_kernel_channel *kchan;
1972
1973 DBG("Listing channels for session %s", session->name);
1974
1975 switch (domain) {
1976 case LTTNG_DOMAIN_KERNEL:
1977 /* Kernel channels */
1978 if (session->kernel_session != NULL) {
1979 cds_list_for_each_entry(kchan,
1980 &session->kernel_session->channel_list.head, list) {
1981 /* Copy lttng_channel struct to array */
1982 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1983 channels[i].enabled = kchan->enabled;
1984 i++;
1985 }
1986 }
1987 break;
1988 case LTTNG_DOMAIN_UST:
1989 {
1990 struct lttng_ht_iter iter;
1991 struct ltt_ust_channel *uchan;
1992
1993 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1994 &iter.iter, uchan, node.node) {
1995 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1996 channels[i].attr.overwrite = uchan->attr.overwrite;
1997 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1998 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1999 channels[i].attr.switch_timer_interval =
2000 uchan->attr.switch_timer_interval;
2001 channels[i].attr.read_timer_interval =
2002 uchan->attr.read_timer_interval;
2003 channels[i].enabled = uchan->enabled;
2004 switch (uchan->attr.output) {
2005 case LTTNG_UST_MMAP:
2006 default:
2007 channels[i].attr.output = LTTNG_EVENT_MMAP;
2008 break;
2009 }
2010 i++;
2011 }
2012 break;
2013 }
2014 default:
2015 break;
2016 }
2017 }
2018
2019 /*
2020 * Create a list of ust global domain events.
2021 */
2022 static int list_lttng_ust_global_events(char *channel_name,
2023 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2024 {
2025 int i = 0, ret = 0;
2026 unsigned int nb_event = 0;
2027 struct lttng_ht_iter iter;
2028 struct lttng_ht_node_str *node;
2029 struct ltt_ust_channel *uchan;
2030 struct ltt_ust_event *uevent;
2031 struct lttng_event *tmp;
2032
2033 DBG("Listing UST global events for channel %s", channel_name);
2034
2035 rcu_read_lock();
2036
2037 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2038 node = lttng_ht_iter_get_node_str(&iter);
2039 if (node == NULL) {
2040 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2041 goto error;
2042 }
2043
2044 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2045
2046 nb_event += lttng_ht_get_count(uchan->events);
2047
2048 if (nb_event == 0) {
2049 ret = nb_event;
2050 goto error;
2051 }
2052
2053 DBG3("Listing UST global %d events", nb_event);
2054
2055 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2056 if (tmp == NULL) {
2057 ret = -LTTCOMM_FATAL;
2058 goto error;
2059 }
2060
2061 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2062 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2063 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2064 tmp[i].enabled = uevent->enabled;
2065 switch (uevent->attr.instrumentation) {
2066 case LTTNG_UST_TRACEPOINT:
2067 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2068 break;
2069 case LTTNG_UST_PROBE:
2070 tmp[i].type = LTTNG_EVENT_PROBE;
2071 break;
2072 case LTTNG_UST_FUNCTION:
2073 tmp[i].type = LTTNG_EVENT_FUNCTION;
2074 break;
2075 }
2076 tmp[i].loglevel = uevent->attr.loglevel;
2077 switch (uevent->attr.loglevel_type) {
2078 case LTTNG_UST_LOGLEVEL_ALL:
2079 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2080 break;
2081 case LTTNG_UST_LOGLEVEL_RANGE:
2082 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2083 break;
2084 case LTTNG_UST_LOGLEVEL_SINGLE:
2085 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2086 break;
2087 }
2088 i++;
2089 }
2090
2091 ret = nb_event;
2092 *events = tmp;
2093
2094 error:
2095 rcu_read_unlock();
2096 return ret;
2097 }
2098
2099 /*
2100 * Fill lttng_event array of all kernel events in the channel.
2101 */
2102 static int list_lttng_kernel_events(char *channel_name,
2103 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2104 {
2105 int i = 0, ret;
2106 unsigned int nb_event;
2107 struct ltt_kernel_event *event;
2108 struct ltt_kernel_channel *kchan;
2109
2110 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2111 if (kchan == NULL) {
2112 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2113 goto error;
2114 }
2115
2116 nb_event = kchan->event_count;
2117
2118 DBG("Listing events for channel %s", kchan->channel->name);
2119
2120 if (nb_event == 0) {
2121 ret = nb_event;
2122 goto error;
2123 }
2124
2125 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2126 if (*events == NULL) {
2127 ret = LTTCOMM_FATAL;
2128 goto error;
2129 }
2130
2131 /* Kernel channels */
2132 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2133 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2134 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2135 (*events)[i].enabled = event->enabled;
2136 switch (event->event->instrumentation) {
2137 case LTTNG_KERNEL_TRACEPOINT:
2138 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2139 break;
2140 case LTTNG_KERNEL_KPROBE:
2141 case LTTNG_KERNEL_KRETPROBE:
2142 (*events)[i].type = LTTNG_EVENT_PROBE;
2143 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2144 sizeof(struct lttng_kernel_kprobe));
2145 break;
2146 case LTTNG_KERNEL_FUNCTION:
2147 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2148 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2149 sizeof(struct lttng_kernel_function));
2150 break;
2151 case LTTNG_KERNEL_NOOP:
2152 (*events)[i].type = LTTNG_EVENT_NOOP;
2153 break;
2154 case LTTNG_KERNEL_SYSCALL:
2155 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2156 break;
2157 case LTTNG_KERNEL_ALL:
2158 assert(0);
2159 break;
2160 }
2161 i++;
2162 }
2163
2164 return nb_event;
2165
2166 error:
2167 return ret;
2168 }
2169
2170 /*
2171 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2172 */
2173 static int cmd_disable_channel(struct ltt_session *session,
2174 int domain, char *channel_name)
2175 {
2176 int ret;
2177 struct ltt_ust_session *usess;
2178
2179 usess = session->ust_session;
2180
2181 switch (domain) {
2182 case LTTNG_DOMAIN_KERNEL:
2183 {
2184 ret = channel_kernel_disable(session->kernel_session,
2185 channel_name);
2186 if (ret != LTTCOMM_OK) {
2187 goto error;
2188 }
2189
2190 kernel_wait_quiescent(kernel_tracer_fd);
2191 break;
2192 }
2193 case LTTNG_DOMAIN_UST:
2194 {
2195 struct ltt_ust_channel *uchan;
2196 struct lttng_ht *chan_ht;
2197
2198 chan_ht = usess->domain_global.channels;
2199
2200 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2201 if (uchan == NULL) {
2202 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2203 goto error;
2204 }
2205
2206 ret = channel_ust_disable(usess, domain, uchan);
2207 if (ret != LTTCOMM_OK) {
2208 goto error;
2209 }
2210 break;
2211 }
2212 #if 0
2213 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2214 case LTTNG_DOMAIN_UST_EXEC_NAME:
2215 case LTTNG_DOMAIN_UST_PID:
2216 #endif
2217 default:
2218 ret = LTTCOMM_UNKNOWN_DOMAIN;
2219 goto error;
2220 }
2221
2222 ret = LTTCOMM_OK;
2223
2224 error:
2225 return ret;
2226 }
2227
2228 /*
2229 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2230 */
2231 static int cmd_enable_channel(struct ltt_session *session,
2232 int domain, struct lttng_channel *attr)
2233 {
2234 int ret;
2235 struct ltt_ust_session *usess = session->ust_session;
2236 struct lttng_ht *chan_ht;
2237
2238 DBG("Enabling channel %s for session %s", attr->name, session->name);
2239
2240 switch (domain) {
2241 case LTTNG_DOMAIN_KERNEL:
2242 {
2243 struct ltt_kernel_channel *kchan;
2244
2245 kchan = trace_kernel_get_channel_by_name(attr->name,
2246 session->kernel_session);
2247 if (kchan == NULL) {
2248 ret = channel_kernel_create(session->kernel_session,
2249 attr, kernel_poll_pipe[1]);
2250 } else {
2251 ret = channel_kernel_enable(session->kernel_session, kchan);
2252 }
2253
2254 if (ret != LTTCOMM_OK) {
2255 goto error;
2256 }
2257
2258 kernel_wait_quiescent(kernel_tracer_fd);
2259 break;
2260 }
2261 case LTTNG_DOMAIN_UST:
2262 {
2263 struct ltt_ust_channel *uchan;
2264
2265 chan_ht = usess->domain_global.channels;
2266
2267 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2268 if (uchan == NULL) {
2269 ret = channel_ust_create(usess, domain, attr);
2270 } else {
2271 ret = channel_ust_enable(usess, domain, uchan);
2272 }
2273 break;
2274 }
2275 #if 0
2276 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2277 case LTTNG_DOMAIN_UST_EXEC_NAME:
2278 case LTTNG_DOMAIN_UST_PID:
2279 #endif
2280 default:
2281 ret = LTTCOMM_UNKNOWN_DOMAIN;
2282 goto error;
2283 }
2284
2285 error:
2286 return ret;
2287 }
2288
2289 /*
2290 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2291 */
2292 static int cmd_disable_event(struct ltt_session *session, int domain,
2293 char *channel_name, char *event_name)
2294 {
2295 int ret;
2296
2297 switch (domain) {
2298 case LTTNG_DOMAIN_KERNEL:
2299 {
2300 struct ltt_kernel_channel *kchan;
2301 struct ltt_kernel_session *ksess;
2302
2303 ksess = session->kernel_session;
2304
2305 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2306 if (kchan == NULL) {
2307 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2308 goto error;
2309 }
2310
2311 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2312 if (ret != LTTCOMM_OK) {
2313 goto error;
2314 }
2315
2316 kernel_wait_quiescent(kernel_tracer_fd);
2317 break;
2318 }
2319 case LTTNG_DOMAIN_UST:
2320 {
2321 struct ltt_ust_channel *uchan;
2322 struct ltt_ust_session *usess;
2323
2324 usess = session->ust_session;
2325
2326 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2327 channel_name);
2328 if (uchan == NULL) {
2329 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2330 goto error;
2331 }
2332
2333 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2334 if (ret != LTTCOMM_OK) {
2335 goto error;
2336 }
2337
2338 DBG3("Disable UST event %s in channel %s completed", event_name,
2339 channel_name);
2340 break;
2341 }
2342 #if 0
2343 case LTTNG_DOMAIN_UST_EXEC_NAME:
2344 case LTTNG_DOMAIN_UST_PID:
2345 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2346 #endif
2347 default:
2348 ret = LTTCOMM_UND;
2349 goto error;
2350 }
2351
2352 ret = LTTCOMM_OK;
2353
2354 error:
2355 return ret;
2356 }
2357
2358 /*
2359 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2360 */
2361 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2362 char *channel_name)
2363 {
2364 int ret;
2365
2366 switch (domain) {
2367 case LTTNG_DOMAIN_KERNEL:
2368 {
2369 struct ltt_kernel_session *ksess;
2370 struct ltt_kernel_channel *kchan;
2371
2372 ksess = session->kernel_session;
2373
2374 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2375 if (kchan == NULL) {
2376 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2377 goto error;
2378 }
2379
2380 ret = event_kernel_disable_all(ksess, kchan);
2381 if (ret != LTTCOMM_OK) {
2382 goto error;
2383 }
2384
2385 kernel_wait_quiescent(kernel_tracer_fd);
2386 break;
2387 }
2388 case LTTNG_DOMAIN_UST:
2389 {
2390 struct ltt_ust_session *usess;
2391 struct ltt_ust_channel *uchan;
2392
2393 usess = session->ust_session;
2394
2395 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2396 channel_name);
2397 if (uchan == NULL) {
2398 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2399 goto error;
2400 }
2401
2402 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2403 if (ret != 0) {
2404 goto error;
2405 }
2406
2407 DBG3("Disable all UST events in channel %s completed", channel_name);
2408
2409 break;
2410 }
2411 #if 0
2412 case LTTNG_DOMAIN_UST_EXEC_NAME:
2413 case LTTNG_DOMAIN_UST_PID:
2414 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2415 #endif
2416 default:
2417 ret = LTTCOMM_UND;
2418 goto error;
2419 }
2420
2421 ret = LTTCOMM_OK;
2422
2423 error:
2424 return ret;
2425 }
2426
2427 /*
2428 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2429 */
2430 static int cmd_add_context(struct ltt_session *session, int domain,
2431 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2432 {
2433 int ret;
2434
2435 switch (domain) {
2436 case LTTNG_DOMAIN_KERNEL:
2437 /* Add kernel context to kernel tracer */
2438 ret = context_kernel_add(session->kernel_session, ctx,
2439 event_name, channel_name);
2440 if (ret != LTTCOMM_OK) {
2441 goto error;
2442 }
2443 break;
2444 case LTTNG_DOMAIN_UST:
2445 {
2446 struct ltt_ust_session *usess = session->ust_session;
2447
2448 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2449 if (ret != LTTCOMM_OK) {
2450 goto error;
2451 }
2452 break;
2453 }
2454 #if 0
2455 case LTTNG_DOMAIN_UST_EXEC_NAME:
2456 case LTTNG_DOMAIN_UST_PID:
2457 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2458 #endif
2459 default:
2460 ret = LTTCOMM_UND;
2461 goto error;
2462 }
2463
2464 ret = LTTCOMM_OK;
2465
2466 error:
2467 return ret;
2468 }
2469
2470 /*
2471 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2472 */
2473 static int cmd_enable_event(struct ltt_session *session, int domain,
2474 char *channel_name, struct lttng_event *event)
2475 {
2476 int ret;
2477 struct lttng_channel *attr;
2478 struct ltt_ust_session *usess = session->ust_session;
2479
2480 switch (domain) {
2481 case LTTNG_DOMAIN_KERNEL:
2482 {
2483 struct ltt_kernel_channel *kchan;
2484
2485 kchan = trace_kernel_get_channel_by_name(channel_name,
2486 session->kernel_session);
2487 if (kchan == NULL) {
2488 attr = channel_new_default_attr(domain);
2489 if (attr == NULL) {
2490 ret = LTTCOMM_FATAL;
2491 goto error;
2492 }
2493 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2494
2495 /* This call will notify the kernel thread */
2496 ret = channel_kernel_create(session->kernel_session,
2497 attr, kernel_poll_pipe[1]);
2498 if (ret != LTTCOMM_OK) {
2499 free(attr);
2500 goto error;
2501 }
2502 free(attr);
2503 }
2504
2505 /* Get the newly created kernel channel pointer */
2506 kchan = trace_kernel_get_channel_by_name(channel_name,
2507 session->kernel_session);
2508 if (kchan == NULL) {
2509 /* This sould not happen... */
2510 ret = LTTCOMM_FATAL;
2511 goto error;
2512 }
2513
2514 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2515 event);
2516 if (ret != LTTCOMM_OK) {
2517 goto error;
2518 }
2519
2520 kernel_wait_quiescent(kernel_tracer_fd);
2521 break;
2522 }
2523 case LTTNG_DOMAIN_UST:
2524 {
2525 struct lttng_channel *attr;
2526 struct ltt_ust_channel *uchan;
2527
2528 /* Get channel from global UST domain */
2529 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2530 channel_name);
2531 if (uchan == NULL) {
2532 /* Create default channel */
2533 attr = channel_new_default_attr(domain);
2534 if (attr == NULL) {
2535 ret = LTTCOMM_FATAL;
2536 goto error;
2537 }
2538 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2539 attr->name[NAME_MAX - 1] = '\0';
2540
2541 ret = channel_ust_create(usess, domain, attr);
2542 if (ret != LTTCOMM_OK) {
2543 free(attr);
2544 goto error;
2545 }
2546 free(attr);
2547
2548 /* Get the newly created channel reference back */
2549 uchan = trace_ust_find_channel_by_name(
2550 usess->domain_global.channels, channel_name);
2551 if (uchan == NULL) {
2552 /* Something is really wrong */
2553 ret = LTTCOMM_FATAL;
2554 goto error;
2555 }
2556 }
2557
2558 /* At this point, the session and channel exist on the tracer */
2559 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2560 if (ret != LTTCOMM_OK) {
2561 goto error;
2562 }
2563 break;
2564 }
2565 #if 0
2566 case LTTNG_DOMAIN_UST_EXEC_NAME:
2567 case LTTNG_DOMAIN_UST_PID:
2568 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2569 #endif
2570 default:
2571 ret = LTTCOMM_UND;
2572 goto error;
2573 }
2574
2575 ret = LTTCOMM_OK;
2576
2577 error:
2578 return ret;
2579 }
2580
2581 /*
2582 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2583 */
2584 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2585 char *channel_name, int event_type)
2586 {
2587 int ret;
2588 struct ltt_kernel_channel *kchan;
2589
2590 switch (domain) {
2591 case LTTNG_DOMAIN_KERNEL:
2592 kchan = trace_kernel_get_channel_by_name(channel_name,
2593 session->kernel_session);
2594 if (kchan == NULL) {
2595 /* This call will notify the kernel thread */
2596 ret = channel_kernel_create(session->kernel_session, NULL,
2597 kernel_poll_pipe[1]);
2598 if (ret != LTTCOMM_OK) {
2599 goto error;
2600 }
2601
2602 /* Get the newly created kernel channel pointer */
2603 kchan = trace_kernel_get_channel_by_name(channel_name,
2604 session->kernel_session);
2605 if (kchan == NULL) {
2606 /* This sould not happen... */
2607 ret = LTTCOMM_FATAL;
2608 goto error;
2609 }
2610
2611 }
2612
2613 switch (event_type) {
2614 case LTTNG_EVENT_SYSCALL:
2615 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2616 kchan, kernel_tracer_fd);
2617 break;
2618 case LTTNG_EVENT_TRACEPOINT:
2619 /*
2620 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2621 * events already registered to the channel.
2622 */
2623 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2624 kchan, kernel_tracer_fd);
2625 break;
2626 case LTTNG_EVENT_ALL:
2627 /* Enable syscalls and tracepoints */
2628 ret = event_kernel_enable_all(session->kernel_session,
2629 kchan, kernel_tracer_fd);
2630 break;
2631 default:
2632 ret = LTTCOMM_KERN_ENABLE_FAIL;
2633 goto error;
2634 }
2635
2636 /* Manage return value */
2637 if (ret != LTTCOMM_OK) {
2638 goto error;
2639 }
2640
2641 kernel_wait_quiescent(kernel_tracer_fd);
2642 break;
2643 case LTTNG_DOMAIN_UST:
2644 {
2645 struct lttng_channel *attr;
2646 struct ltt_ust_channel *uchan;
2647 struct ltt_ust_session *usess = session->ust_session;
2648
2649 /* Get channel from global UST domain */
2650 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2651 channel_name);
2652 if (uchan == NULL) {
2653 /* Create default channel */
2654 attr = channel_new_default_attr(domain);
2655 if (attr == NULL) {
2656 ret = LTTCOMM_FATAL;
2657 goto error;
2658 }
2659 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2660 attr->name[NAME_MAX - 1] = '\0';
2661
2662 /* Use the internal command enable channel */
2663 ret = channel_ust_create(usess, domain, attr);
2664 if (ret != LTTCOMM_OK) {
2665 free(attr);
2666 goto error;
2667 }
2668 free(attr);
2669
2670 /* Get the newly created channel reference back */
2671 uchan = trace_ust_find_channel_by_name(
2672 usess->domain_global.channels, channel_name);
2673 if (uchan == NULL) {
2674 /* Something is really wrong */
2675 ret = LTTCOMM_FATAL;
2676 goto error;
2677 }
2678 }
2679
2680 /* At this point, the session and channel exist on the tracer */
2681
2682 switch (event_type) {
2683 case LTTNG_EVENT_ALL:
2684 case LTTNG_EVENT_TRACEPOINT:
2685 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2686 if (ret != LTTCOMM_OK) {
2687 goto error;
2688 }
2689 break;
2690 default:
2691 ret = LTTCOMM_UST_ENABLE_FAIL;
2692 goto error;
2693 }
2694
2695 /* Manage return value */
2696 if (ret != LTTCOMM_OK) {
2697 goto error;
2698 }
2699
2700 break;
2701 }
2702 #if 0
2703 case LTTNG_DOMAIN_UST_EXEC_NAME:
2704 case LTTNG_DOMAIN_UST_PID:
2705 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2706 #endif
2707 default:
2708 ret = LTTCOMM_UND;
2709 goto error;
2710 }
2711
2712 ret = LTTCOMM_OK;
2713
2714 error:
2715 return ret;
2716 }
2717
2718 /*
2719 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2720 */
2721 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2722 {
2723 int ret;
2724 ssize_t nb_events = 0;
2725
2726 switch (domain) {
2727 case LTTNG_DOMAIN_KERNEL:
2728 nb_events = kernel_list_events(kernel_tracer_fd, events);
2729 if (nb_events < 0) {
2730 ret = LTTCOMM_KERN_LIST_FAIL;
2731 goto error;
2732 }
2733 break;
2734 case LTTNG_DOMAIN_UST:
2735 nb_events = ust_app_list_events(events);
2736 if (nb_events < 0) {
2737 ret = LTTCOMM_UST_LIST_FAIL;
2738 goto error;
2739 }
2740 break;
2741 default:
2742 ret = LTTCOMM_UND;
2743 goto error;
2744 }
2745
2746 return nb_events;
2747
2748 error:
2749 /* Return negative value to differentiate return code */
2750 return -ret;
2751 }
2752
2753 /*
2754 * Command LTTNG_START_TRACE processed by the client thread.
2755 */
2756 static int cmd_start_trace(struct ltt_session *session)
2757 {
2758 int ret;
2759 struct ltt_kernel_session *ksession;
2760 struct ltt_ust_session *usess;
2761
2762 /* Short cut */
2763 ksession = session->kernel_session;
2764 usess = session->ust_session;
2765
2766 if (session->enabled) {
2767 ret = LTTCOMM_UST_START_FAIL;
2768 goto error;
2769 }
2770
2771 session->enabled = 1;
2772
2773 /* Kernel tracing */
2774 if (ksession != NULL) {
2775 struct ltt_kernel_channel *kchan;
2776
2777 /* Open kernel metadata */
2778 if (ksession->metadata == NULL) {
2779 ret = kernel_open_metadata(ksession, ksession->trace_path);
2780 if (ret < 0) {
2781 ret = LTTCOMM_KERN_META_FAIL;
2782 goto error;
2783 }
2784 }
2785
2786 /* Open kernel metadata stream */
2787 if (ksession->metadata_stream_fd == 0) {
2788 ret = kernel_open_metadata_stream(ksession);
2789 if (ret < 0) {
2790 ERR("Kernel create metadata stream failed");
2791 ret = LTTCOMM_KERN_STREAM_FAIL;
2792 goto error;
2793 }
2794 }
2795
2796 /* For each channel */
2797 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2798 if (kchan->stream_count == 0) {
2799 ret = kernel_open_channel_stream(kchan);
2800 if (ret < 0) {
2801 ret = LTTCOMM_KERN_STREAM_FAIL;
2802 goto error;
2803 }
2804 /* Update the stream global counter */
2805 ksession->stream_count_global += ret;
2806 }
2807 }
2808
2809 /* Setup kernel consumer socket and send fds to it */
2810 ret = init_kernel_tracing(ksession);
2811 if (ret < 0) {
2812 ret = LTTCOMM_KERN_START_FAIL;
2813 goto error;
2814 }
2815
2816 /* This start the kernel tracing */
2817 ret = kernel_start_session(ksession);
2818 if (ret < 0) {
2819 ret = LTTCOMM_KERN_START_FAIL;
2820 goto error;
2821 }
2822
2823 /* Quiescent wait after starting trace */
2824 kernel_wait_quiescent(kernel_tracer_fd);
2825 }
2826
2827 /* Flag session that trace should start automatically */
2828 if (usess) {
2829 usess->start_trace = 1;
2830
2831 ret = ust_app_start_trace_all(usess);
2832 if (ret < 0) {
2833 ret = LTTCOMM_UST_START_FAIL;
2834 goto error;
2835 }
2836 }
2837
2838 ret = LTTCOMM_OK;
2839
2840 error:
2841 return ret;
2842 }
2843
2844 /*
2845 * Command LTTNG_STOP_TRACE processed by the client thread.
2846 */
2847 static int cmd_stop_trace(struct ltt_session *session)
2848 {
2849 int ret;
2850 struct ltt_kernel_channel *kchan;
2851 struct ltt_kernel_session *ksession;
2852 struct ltt_ust_session *usess;
2853
2854 /* Short cut */
2855 ksession = session->kernel_session;
2856 usess = session->ust_session;
2857
2858 if (!session->enabled) {
2859 ret = LTTCOMM_UST_STOP_FAIL;
2860 goto error;
2861 }
2862
2863 session->enabled = 0;
2864
2865 /* Kernel tracer */
2866 if (ksession != NULL) {
2867 DBG("Stop kernel tracing");
2868
2869 /* Flush all buffers before stopping */
2870 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2871 if (ret < 0) {
2872 ERR("Kernel metadata flush failed");
2873 }
2874
2875 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2876 ret = kernel_flush_buffer(kchan);
2877 if (ret < 0) {
2878 ERR("Kernel flush buffer error");
2879 }
2880 }
2881
2882 ret = kernel_stop_session(ksession);
2883 if (ret < 0) {
2884 ret = LTTCOMM_KERN_STOP_FAIL;
2885 goto error;
2886 }
2887
2888 kernel_wait_quiescent(kernel_tracer_fd);
2889 }
2890
2891 if (usess) {
2892 usess->start_trace = 0;
2893
2894 ret = ust_app_stop_trace_all(usess);
2895 if (ret < 0) {
2896 ret = LTTCOMM_UST_STOP_FAIL;
2897 goto error;
2898 }
2899 }
2900
2901 ret = LTTCOMM_OK;
2902
2903 error:
2904 return ret;
2905 }
2906
2907 /*
2908 * Command LTTNG_CREATE_SESSION processed by the client thread.
2909 */
2910 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2911 {
2912 int ret;
2913
2914 ret = session_create(name, path, creds->uid, creds->gid);
2915 if (ret != LTTCOMM_OK) {
2916 goto error;
2917 }
2918
2919 ret = LTTCOMM_OK;
2920
2921 error:
2922 return ret;
2923 }
2924
2925 /*
2926 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2927 */
2928 static int cmd_destroy_session(struct ltt_session *session, char *name)
2929 {
2930 int ret;
2931
2932 /* Clean kernel session teardown */
2933 teardown_kernel_session(session);
2934 /* UST session teardown */
2935 teardown_ust_session(session);
2936
2937 /*
2938 * Must notify the kernel thread here to update it's poll setin order
2939 * to remove the channel(s)' fd just destroyed.
2940 */
2941 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2942 if (ret < 0) {
2943 perror("write kernel poll pipe");
2944 }
2945
2946 ret = session_destroy(session);
2947
2948 return ret;
2949 }
2950
2951 /*
2952 * Command LTTNG_CALIBRATE processed by the client thread.
2953 */
2954 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2955 {
2956 int ret;
2957
2958 switch (domain) {
2959 case LTTNG_DOMAIN_KERNEL:
2960 {
2961 struct lttng_kernel_calibrate kcalibrate;
2962
2963 kcalibrate.type = calibrate->type;
2964 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2965 if (ret < 0) {
2966 ret = LTTCOMM_KERN_ENABLE_FAIL;
2967 goto error;
2968 }
2969 break;
2970 }
2971 case LTTNG_DOMAIN_UST:
2972 {
2973 struct lttng_ust_calibrate ucalibrate;
2974
2975 ucalibrate.type = calibrate->type;
2976 ret = ust_app_calibrate_glb(&ucalibrate);
2977 if (ret < 0) {
2978 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2979 goto error;
2980 }
2981 break;
2982 }
2983 default:
2984 ret = LTTCOMM_UND;
2985 goto error;
2986 }
2987
2988 ret = LTTCOMM_OK;
2989
2990 error:
2991 return ret;
2992 }
2993
2994 /*
2995 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2996 */
2997 static int cmd_register_consumer(struct ltt_session *session, int domain,
2998 char *sock_path)
2999 {
3000 int ret, sock;
3001
3002 switch (domain) {
3003 case LTTNG_DOMAIN_KERNEL:
3004 /* Can't register a consumer if there is already one */
3005 if (session->kernel_session->consumer_fds_sent != 0) {
3006 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3007 goto error;
3008 }
3009
3010 sock = lttcomm_connect_unix_sock(sock_path);
3011 if (sock < 0) {
3012 ret = LTTCOMM_CONNECT_FAIL;
3013 goto error;
3014 }
3015
3016 session->kernel_session->consumer_fd = sock;
3017 break;
3018 default:
3019 /* TODO: Userspace tracing */
3020 ret = LTTCOMM_UND;
3021 goto error;
3022 }
3023
3024 ret = LTTCOMM_OK;
3025
3026 error:
3027 return ret;
3028 }
3029
3030 /*
3031 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3032 */
3033 static ssize_t cmd_list_domains(struct ltt_session *session,
3034 struct lttng_domain **domains)
3035 {
3036 int ret, index = 0;
3037 ssize_t nb_dom = 0;
3038
3039 if (session->kernel_session != NULL) {
3040 DBG3("Listing domains found kernel domain");
3041 nb_dom++;
3042 }
3043
3044 if (session->ust_session != NULL) {
3045 DBG3("Listing domains found UST global domain");
3046 nb_dom++;
3047 }
3048
3049 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3050 if (*domains == NULL) {
3051 ret = -LTTCOMM_FATAL;
3052 goto error;
3053 }
3054
3055 if (session->kernel_session != NULL) {
3056 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3057 index++;
3058 }
3059
3060 if (session->ust_session != NULL) {
3061 (*domains)[index].type = LTTNG_DOMAIN_UST;
3062 index++;
3063 }
3064
3065 return nb_dom;
3066
3067 error:
3068 return ret;
3069 }
3070
3071 /*
3072 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3073 */
3074 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3075 struct lttng_channel **channels)
3076 {
3077 int ret;
3078 ssize_t nb_chan = 0;
3079
3080 switch (domain) {
3081 case LTTNG_DOMAIN_KERNEL:
3082 if (session->kernel_session != NULL) {
3083 nb_chan = session->kernel_session->channel_count;
3084 }
3085 DBG3("Number of kernel channels %zd", nb_chan);
3086 break;
3087 case LTTNG_DOMAIN_UST:
3088 if (session->ust_session != NULL) {
3089 nb_chan = lttng_ht_get_count(
3090 session->ust_session->domain_global.channels);
3091 }
3092 DBG3("Number of UST global channels %zd", nb_chan);
3093 break;
3094 default:
3095 *channels = NULL;
3096 ret = -LTTCOMM_UND;
3097 goto error;
3098 }
3099
3100 if (nb_chan > 0) {
3101 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3102 if (*channels == NULL) {
3103 ret = -LTTCOMM_FATAL;
3104 goto error;
3105 }
3106
3107 list_lttng_channels(domain, session, *channels);
3108 } else {
3109 *channels = NULL;
3110 }
3111
3112 return nb_chan;
3113
3114 error:
3115 return ret;
3116 }
3117
3118 /*
3119 * Command LTTNG_LIST_EVENTS processed by the client thread.
3120 */
3121 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3122 char *channel_name, struct lttng_event **events)
3123 {
3124 int ret = 0;
3125 ssize_t nb_event = 0;
3126
3127 switch (domain) {
3128 case LTTNG_DOMAIN_KERNEL:
3129 if (session->kernel_session != NULL) {
3130 nb_event = list_lttng_kernel_events(channel_name,
3131 session->kernel_session, events);
3132 }
3133 break;
3134 case LTTNG_DOMAIN_UST:
3135 {
3136 if (session->ust_session != NULL) {
3137 nb_event = list_lttng_ust_global_events(channel_name,
3138 &session->ust_session->domain_global, events);
3139 }
3140 break;
3141 }
3142 default:
3143 ret = -LTTCOMM_UND;
3144 goto error;
3145 }
3146
3147 ret = nb_event;
3148
3149 error:
3150 return ret;
3151 }
3152
3153 /*
3154 * Process the command requested by the lttng client within the command
3155 * context structure. This function make sure that the return structure (llm)
3156 * is set and ready for transmission before returning.
3157 *
3158 * Return any error encountered or 0 for success.
3159 */
3160 static int process_client_msg(struct command_ctx *cmd_ctx)
3161 {
3162 int ret = LTTCOMM_OK;
3163 int need_tracing_session = 1;
3164 int need_domain;
3165
3166 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3167
3168 switch (cmd_ctx->lsm->cmd_type) {
3169 case LTTNG_CREATE_SESSION:
3170 case LTTNG_DESTROY_SESSION:
3171 case LTTNG_LIST_SESSIONS:
3172 case LTTNG_LIST_DOMAINS:
3173 case LTTNG_START_TRACE:
3174 case LTTNG_STOP_TRACE:
3175 need_domain = 0;
3176 break;
3177 default:
3178 need_domain = 1;
3179 }
3180
3181 if (opt_no_kernel && need_domain
3182 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3183 ret = LTTCOMM_KERN_NA;
3184 goto error;
3185 }
3186
3187 /*
3188 * Check for command that don't needs to allocate a returned payload. We do
3189 * this here so we don't have to make the call for no payload at each
3190 * command.
3191 */
3192 switch(cmd_ctx->lsm->cmd_type) {
3193 case LTTNG_LIST_SESSIONS:
3194 case LTTNG_LIST_TRACEPOINTS:
3195 case LTTNG_LIST_DOMAINS:
3196 case LTTNG_LIST_CHANNELS:
3197 case LTTNG_LIST_EVENTS:
3198 break;
3199 default:
3200 /* Setup lttng message with no payload */
3201 ret = setup_lttng_msg(cmd_ctx, 0);
3202 if (ret < 0) {
3203 /* This label does not try to unlock the session */
3204 goto init_setup_error;
3205 }
3206 }
3207
3208 /* Commands that DO NOT need a session. */
3209 switch (cmd_ctx->lsm->cmd_type) {
3210 case LTTNG_CREATE_SESSION:
3211 case LTTNG_CALIBRATE:
3212 case LTTNG_LIST_SESSIONS:
3213 case LTTNG_LIST_TRACEPOINTS:
3214 need_tracing_session = 0;
3215 break;
3216 default:
3217 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3218 session_lock_list();
3219 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3220 session_unlock_list();
3221 if (cmd_ctx->session == NULL) {
3222 if (cmd_ctx->lsm->session.name != NULL) {
3223 ret = LTTCOMM_SESS_NOT_FOUND;
3224 } else {
3225 /* If no session name specified */
3226 ret = LTTCOMM_SELECT_SESS;
3227 }
3228 goto error;
3229 } else {
3230 /* Acquire lock for the session */
3231 session_lock(cmd_ctx->session);
3232 }
3233 break;
3234 }
3235
3236 if (!need_domain) {
3237 goto skip_domain;
3238 }
3239 /*
3240 * Check domain type for specific "pre-action".
3241 */
3242 switch (cmd_ctx->lsm->domain.type) {
3243 case LTTNG_DOMAIN_KERNEL:
3244 if (!is_root) {
3245 ret = LTTCOMM_KERN_NA;
3246 goto error;
3247 }
3248
3249 /* Kernel tracer check */
3250 if (kernel_tracer_fd == 0) {
3251 /* Basically, load kernel tracer modules */
3252 ret = init_kernel_tracer();
3253 if (ret != 0) {
3254 goto error;
3255 }
3256 }
3257
3258 /* Need a session for kernel command */
3259 if (need_tracing_session) {
3260 if (cmd_ctx->session->kernel_session == NULL) {
3261 ret = create_kernel_session(cmd_ctx->session);
3262 if (ret < 0) {
3263 ret = LTTCOMM_KERN_SESS_FAIL;
3264 goto error;
3265 }
3266 }
3267
3268 /* Start the kernel consumer daemon */
3269 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3270 if (kconsumer_data.pid == 0 &&
3271 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3272 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3273 ret = start_consumerd(&kconsumer_data);
3274 if (ret < 0) {
3275 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3276 goto error;
3277 }
3278 } else {
3279 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3280 }
3281 }
3282 break;
3283 case LTTNG_DOMAIN_UST:
3284 {
3285 if (need_tracing_session) {
3286 if (cmd_ctx->session->ust_session == NULL) {
3287 ret = create_ust_session(cmd_ctx->session,
3288 &cmd_ctx->lsm->domain);
3289 if (ret != LTTCOMM_OK) {
3290 goto error;
3291 }
3292 }
3293 /* Start the UST consumer daemons */
3294 /* 64-bit */
3295 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3296 if (consumerd64_bin[0] != '\0' &&
3297 ustconsumer64_data.pid == 0 &&
3298 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3299 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3300 ret = start_consumerd(&ustconsumer64_data);
3301 if (ret < 0) {
3302 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3303 ust_consumerd64_fd = -EINVAL;
3304 goto error;
3305 }
3306
3307 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3308 } else {
3309 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3310 }
3311 /* 32-bit */
3312 if (consumerd32_bin[0] != '\0' &&
3313 ustconsumer32_data.pid == 0 &&
3314 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3315 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3316 ret = start_consumerd(&ustconsumer32_data);
3317 if (ret < 0) {
3318 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3319 ust_consumerd32_fd = -EINVAL;
3320 goto error;
3321 }
3322 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3323 } else {
3324 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3325 }
3326 }
3327 break;
3328 }
3329 default:
3330 break;
3331 }
3332 skip_domain:
3333
3334 /*
3335 * Check that the UID or GID match that of the tracing session.
3336 * The root user can interact with all sessions.
3337 */
3338 if (need_tracing_session) {
3339 if (!session_access_ok(cmd_ctx->session,
3340 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3341 ret = LTTCOMM_EPERM;
3342 goto error;
3343 }
3344 }
3345
3346 /* Process by command type */
3347 switch (cmd_ctx->lsm->cmd_type) {
3348 case LTTNG_ADD_CONTEXT:
3349 {
3350 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3351 cmd_ctx->lsm->u.context.channel_name,
3352 cmd_ctx->lsm->u.context.event_name,
3353 &cmd_ctx->lsm->u.context.ctx);
3354 break;
3355 }
3356 case LTTNG_DISABLE_CHANNEL:
3357 {
3358 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3359 cmd_ctx->lsm->u.disable.channel_name);
3360 break;
3361 }
3362 case LTTNG_DISABLE_EVENT:
3363 {
3364 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3365 cmd_ctx->lsm->u.disable.channel_name,
3366 cmd_ctx->lsm->u.disable.name);
3367 break;
3368 }
3369 case LTTNG_DISABLE_ALL_EVENT:
3370 {
3371 DBG("Disabling all events");
3372
3373 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3374 cmd_ctx->lsm->u.disable.channel_name);
3375 break;
3376 }
3377 case LTTNG_ENABLE_CHANNEL:
3378 {
3379 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3380 &cmd_ctx->lsm->u.channel.chan);
3381 break;
3382 }
3383 case LTTNG_ENABLE_EVENT:
3384 {
3385 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3386 cmd_ctx->lsm->u.enable.channel_name,
3387 &cmd_ctx->lsm->u.enable.event);
3388 break;
3389 }
3390 case LTTNG_ENABLE_ALL_EVENT:
3391 {
3392 DBG("Enabling all events");
3393
3394 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3395 cmd_ctx->lsm->u.enable.channel_name,
3396 cmd_ctx->lsm->u.enable.event.type);
3397 break;
3398 }
3399 case LTTNG_LIST_TRACEPOINTS:
3400 {
3401 struct lttng_event *events;
3402 ssize_t nb_events;
3403
3404 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3405 if (nb_events < 0) {
3406 ret = -nb_events;
3407 goto error;
3408 }
3409
3410 /*
3411 * Setup lttng message with payload size set to the event list size in
3412 * bytes and then copy list into the llm payload.
3413 */
3414 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3415 if (ret < 0) {
3416 free(events);
3417 goto setup_error;
3418 }
3419
3420 /* Copy event list into message payload */
3421 memcpy(cmd_ctx->llm->payload, events,
3422 sizeof(struct lttng_event) * nb_events);
3423
3424 free(events);
3425
3426 ret = LTTCOMM_OK;
3427 break;
3428 }
3429 case LTTNG_START_TRACE:
3430 {
3431 ret = cmd_start_trace(cmd_ctx->session);
3432 break;
3433 }
3434 case LTTNG_STOP_TRACE:
3435 {
3436 ret = cmd_stop_trace(cmd_ctx->session);
3437 break;
3438 }
3439 case LTTNG_CREATE_SESSION:
3440 {
3441 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3442 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3443 break;
3444 }
3445 case LTTNG_DESTROY_SESSION:
3446 {
3447 ret = cmd_destroy_session(cmd_ctx->session,
3448 cmd_ctx->lsm->session.name);
3449 break;
3450 }
3451 case LTTNG_LIST_DOMAINS:
3452 {
3453 ssize_t nb_dom;
3454 struct lttng_domain *domains;
3455
3456 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3457 if (nb_dom < 0) {
3458 ret = -nb_dom;
3459 goto error;
3460 }
3461
3462 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3463 if (ret < 0) {
3464 goto setup_error;
3465 }
3466
3467 /* Copy event list into message payload */
3468 memcpy(cmd_ctx->llm->payload, domains,
3469 nb_dom * sizeof(struct lttng_domain));
3470
3471 free(domains);
3472
3473 ret = LTTCOMM_OK;
3474 break;
3475 }
3476 case LTTNG_LIST_CHANNELS:
3477 {
3478 size_t nb_chan;
3479 struct lttng_channel *channels;
3480
3481 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3482 cmd_ctx->session, &channels);
3483 if (nb_chan < 0) {
3484 ret = -nb_chan;
3485 goto error;
3486 }
3487
3488 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3489 if (ret < 0) {
3490 goto setup_error;
3491 }
3492
3493 /* Copy event list into message payload */
3494 memcpy(cmd_ctx->llm->payload, channels,
3495 nb_chan * sizeof(struct lttng_channel));
3496
3497 free(channels);
3498
3499 ret = LTTCOMM_OK;
3500 break;
3501 }
3502 case LTTNG_LIST_EVENTS:
3503 {
3504 ssize_t nb_event;
3505 struct lttng_event *events = NULL;
3506
3507 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3508 cmd_ctx->lsm->u.list.channel_name, &events);
3509 if (nb_event < 0) {
3510 ret = -nb_event;
3511 goto error;
3512 }
3513
3514 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3515 if (ret < 0) {
3516 goto setup_error;
3517 }
3518
3519 /* Copy event list into message payload */
3520 memcpy(cmd_ctx->llm->payload, events,
3521 nb_event * sizeof(struct lttng_event));
3522
3523 free(events);
3524
3525 ret = LTTCOMM_OK;
3526 break;
3527 }
3528 case LTTNG_LIST_SESSIONS:
3529 {
3530 unsigned int nr_sessions;
3531
3532 session_lock_list();
3533 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3534
3535 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3536 if (ret < 0) {
3537 session_unlock_list();
3538 goto setup_error;
3539 }
3540
3541 /* Filled the session array */
3542 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3543 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3544
3545 session_unlock_list();
3546
3547 ret = LTTCOMM_OK;
3548 break;
3549 }
3550 case LTTNG_CALIBRATE:
3551 {
3552 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3553 &cmd_ctx->lsm->u.calibrate);
3554 break;
3555 }
3556 case LTTNG_REGISTER_CONSUMER:
3557 {
3558 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3559 cmd_ctx->lsm->u.reg.path);
3560 break;
3561 }
3562 default:
3563 ret = LTTCOMM_UND;
3564 break;
3565 }
3566
3567 error:
3568 if (cmd_ctx->llm == NULL) {
3569 DBG("Missing llm structure. Allocating one.");
3570 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3571 goto setup_error;
3572 }
3573 }
3574 /* Set return code */
3575 cmd_ctx->llm->ret_code = ret;
3576 setup_error:
3577 if (cmd_ctx->session) {
3578 session_unlock(cmd_ctx->session);
3579 }
3580 init_setup_error:
3581 return ret;
3582 }
3583
3584 /*
3585 * This thread manage all clients request using the unix client socket for
3586 * communication.
3587 */
3588 static void *thread_manage_clients(void *data)
3589 {
3590 int sock = 0, ret, i, pollfd;
3591 uint32_t revents, nb_fd;
3592 struct command_ctx *cmd_ctx = NULL;
3593 struct lttng_poll_event events;
3594
3595 DBG("[thread] Manage client started");
3596
3597 rcu_register_thread();
3598
3599 ret = lttcomm_listen_unix_sock(client_sock);
3600 if (ret < 0) {
3601 goto error;
3602 }
3603
3604 /*
3605 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3606 * more will be added to this poll set.
3607 */
3608 ret = create_thread_poll_set(&events, 2);
3609 if (ret < 0) {
3610 goto error;
3611 }
3612
3613 /* Add the application registration socket */
3614 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3615 if (ret < 0) {
3616 goto error;
3617 }
3618
3619 /*
3620 * Notify parent pid that we are ready to accept command for client side.
3621 */
3622 if (opt_sig_parent) {
3623 kill(ppid, SIGUSR1);
3624 }
3625
3626 while (1) {
3627 DBG("Accepting client command ...");
3628
3629 nb_fd = LTTNG_POLL_GETNB(&events);
3630
3631 /* Inifinite blocking call, waiting for transmission */
3632 restart:
3633 ret = lttng_poll_wait(&events, -1);
3634 if (ret < 0) {
3635 /*
3636 * Restart interrupted system call.
3637 */
3638 if (errno == EINTR) {
3639 goto restart;
3640 }
3641 goto error;
3642 }
3643
3644 for (i = 0; i < nb_fd; i++) {
3645 /* Fetch once the poll data */
3646 revents = LTTNG_POLL_GETEV(&events, i);
3647 pollfd = LTTNG_POLL_GETFD(&events, i);
3648
3649 /* Thread quit pipe has been closed. Killing thread. */
3650 ret = check_thread_quit_pipe(pollfd, revents);
3651 if (ret) {
3652 goto error;
3653 }
3654
3655 /* Event on the registration socket */
3656 if (pollfd == client_sock) {
3657 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3658 ERR("Client socket poll error");
3659 goto error;
3660 }
3661 }
3662 }
3663
3664 DBG("Wait for client response");
3665
3666 sock = lttcomm_accept_unix_sock(client_sock);
3667 if (sock < 0) {
3668 goto error;
3669 }
3670
3671 /* Set socket option for credentials retrieval */
3672 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3673 if (ret < 0) {
3674 goto error;
3675 }
3676
3677 /* Allocate context command to process the client request */
3678 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3679 if (cmd_ctx == NULL) {
3680 perror("zmalloc cmd_ctx");
3681 goto error;
3682 }
3683
3684 /* Allocate data buffer for reception */
3685 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3686 if (cmd_ctx->lsm == NULL) {
3687 perror("zmalloc cmd_ctx->lsm");
3688 goto error;
3689 }
3690
3691 cmd_ctx->llm = NULL;
3692 cmd_ctx->session = NULL;
3693
3694 /*
3695 * Data is received from the lttng client. The struct
3696 * lttcomm_session_msg (lsm) contains the command and data request of
3697 * the client.
3698 */
3699 DBG("Receiving data from client ...");
3700 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3701 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3702 if (ret <= 0) {
3703 DBG("Nothing recv() from client... continuing");
3704 close(sock);
3705 free(cmd_ctx);
3706 continue;
3707 }
3708
3709 // TODO: Validate cmd_ctx including sanity check for
3710 // security purpose.
3711
3712 rcu_thread_online();
3713 /*
3714 * This function dispatch the work to the kernel or userspace tracer
3715 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3716 * informations for the client. The command context struct contains
3717 * everything this function may needs.
3718 */
3719 ret = process_client_msg(cmd_ctx);
3720 rcu_thread_offline();
3721 if (ret < 0) {
3722 /*
3723 * TODO: Inform client somehow of the fatal error. At
3724 * this point, ret < 0 means that a zmalloc failed
3725 * (ENOMEM). Error detected but still accept command.
3726 */
3727 clean_command_ctx(&cmd_ctx);
3728 continue;
3729 }
3730
3731 DBG("Sending response (size: %d, retcode: %s)",
3732 cmd_ctx->lttng_msg_size,
3733 lttng_strerror(-cmd_ctx->llm->ret_code));
3734 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3735 if (ret < 0) {
3736 ERR("Failed to send data back to client");
3737 }
3738
3739 /* End of transmission */
3740 close(sock);
3741
3742 clean_command_ctx(&cmd_ctx);
3743 }
3744
3745 error:
3746 DBG("Client thread dying");
3747 unlink(client_unix_sock_path);
3748 close(client_sock);
3749 close(sock);
3750
3751 lttng_poll_clean(&events);
3752 clean_command_ctx(&cmd_ctx);
3753
3754 rcu_unregister_thread();
3755 return NULL;
3756 }
3757
3758
3759 /*
3760 * usage function on stderr
3761 */
3762 static void usage(void)
3763 {
3764 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3765 fprintf(stderr, " -h, --help Display this usage.\n");
3766 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3767 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3768 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3769 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3770 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3771 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3772 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3773 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3774 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3775 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3776 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3777 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3778 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3779 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3780 fprintf(stderr, " -V, --version Show version number.\n");
3781 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3782 fprintf(stderr, " -q, --quiet No output at all.\n");
3783 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3784 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3785 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3786 }
3787
3788 /*
3789 * daemon argument parsing
3790 */
3791 static int parse_args(int argc, char **argv)
3792 {
3793 int c;
3794
3795 static struct option long_options[] = {
3796 { "client-sock", 1, 0, 'c' },
3797 { "apps-sock", 1, 0, 'a' },
3798 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3799 { "kconsumerd-err-sock", 1, 0, 'E' },
3800 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3801 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3802 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3803 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3804 { "consumerd32-path", 1, 0, 'u' },
3805 { "consumerd32-libdir", 1, 0, 'U' },
3806 { "consumerd64-path", 1, 0, 't' },
3807 { "consumerd64-libdir", 1, 0, 'T' },
3808 { "daemonize", 0, 0, 'd' },
3809 { "sig-parent", 0, 0, 'S' },
3810 { "help", 0, 0, 'h' },
3811 { "group", 1, 0, 'g' },
3812 { "version", 0, 0, 'V' },
3813 { "quiet", 0, 0, 'q' },
3814 { "verbose", 0, 0, 'v' },
3815 { "verbose-consumer", 0, 0, 'Z' },
3816 { "no-kernel", 0, 0, 'N' },
3817 { NULL, 0, 0, 0 }
3818 };
3819
3820 while (1) {
3821 int option_index = 0;
3822 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3823 long_options, &option_index);
3824 if (c == -1) {
3825 break;
3826 }
3827
3828 switch (c) {
3829 case 0:
3830 fprintf(stderr, "option %s", long_options[option_index].name);
3831 if (optarg) {
3832 fprintf(stderr, " with arg %s\n", optarg);
3833 }
3834 break;
3835 case 'c':
3836 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3837 break;
3838 case 'a':
3839 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3840 break;
3841 case 'd':
3842 opt_daemon = 1;
3843 break;
3844 case 'g':
3845 opt_tracing_group = optarg;
3846 break;
3847 case 'h':
3848 usage();
3849 exit(EXIT_FAILURE);
3850 case 'V':
3851 fprintf(stdout, "%s\n", VERSION);
3852 exit(EXIT_SUCCESS);
3853 case 'S':
3854 opt_sig_parent = 1;
3855 break;
3856 case 'E':
3857 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3858 break;
3859 case 'C':
3860 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3861 break;
3862 case 'F':
3863 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3864 break;
3865 case 'D':
3866 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3867 break;
3868 case 'H':
3869 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3870 break;
3871 case 'G':
3872 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3873 break;
3874 case 'N':
3875 opt_no_kernel = 1;
3876 break;
3877 case 'q':
3878 opt_quiet = 1;
3879 break;
3880 case 'v':
3881 /* Verbose level can increase using multiple -v */
3882 opt_verbose += 1;
3883 break;
3884 case 'Z':
3885 opt_verbose_consumer += 1;
3886 break;
3887 case 'u':
3888 consumerd32_bin= optarg;
3889 break;
3890 case 'U':
3891 consumerd32_libdir = optarg;
3892 break;
3893 case 't':
3894 consumerd64_bin = optarg;
3895 break;
3896 case 'T':
3897 consumerd64_libdir = optarg;
3898 break;
3899 default:
3900 /* Unknown option or other error.
3901 * Error is printed by getopt, just return */
3902 return -1;
3903 }
3904 }
3905
3906 return 0;
3907 }
3908
3909 /*
3910 * Creates the two needed socket by the daemon.
3911 * apps_sock - The communication socket for all UST apps.
3912 * client_sock - The communication of the cli tool (lttng).
3913 */
3914 static int init_daemon_socket(void)
3915 {
3916 int ret = 0;
3917 mode_t old_umask;
3918
3919 old_umask = umask(0);
3920
3921 /* Create client tool unix socket */
3922 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3923 if (client_sock < 0) {
3924 ERR("Create unix sock failed: %s", client_unix_sock_path);
3925 ret = -1;
3926 goto end;
3927 }
3928
3929 /* File permission MUST be 660 */
3930 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3931 if (ret < 0) {
3932 ERR("Set file permissions failed: %s", client_unix_sock_path);
3933 perror("chmod");
3934 goto end;
3935 }
3936
3937 /* Create the application unix socket */
3938 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3939 if (apps_sock < 0) {
3940 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3941 ret = -1;
3942 goto end;
3943 }
3944
3945 /* File permission MUST be 666 */
3946 ret = chmod(apps_unix_sock_path,
3947 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3948 if (ret < 0) {
3949 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3950 perror("chmod");
3951 goto end;
3952 }
3953
3954 end:
3955 umask(old_umask);
3956 return ret;
3957 }
3958
3959 /*
3960 * Check if the global socket is available, and if a daemon is answering at the
3961 * other side. If yes, error is returned.
3962 */
3963 static int check_existing_daemon(void)
3964 {
3965 /* Is there anybody out there ? */
3966 if (lttng_session_daemon_alive()) {
3967 return -EEXIST;
3968 }
3969
3970 return 0;
3971 }
3972
3973 /*
3974 * Set the tracing group gid onto the client socket.
3975 *
3976 * Race window between mkdir and chown is OK because we are going from more
3977 * permissive (root.root) to less permissive (root.tracing).
3978 */
3979 static int set_permissions(char *rundir)
3980 {
3981 int ret;
3982 gid_t gid;
3983
3984 gid = allowed_group();
3985 if (gid < 0) {
3986 WARN("No tracing group detected");
3987 ret = 0;
3988 goto end;
3989 }
3990
3991 /* Set lttng run dir */
3992 ret = chown(rundir, 0, gid);
3993 if (ret < 0) {
3994 ERR("Unable to set group on %s", rundir);
3995 perror("chown");
3996 }
3997
3998 /* Ensure tracing group can search the run dir */
3999 ret = chmod(rundir, S_IRWXU | S_IXGRP);
4000 if (ret < 0) {
4001 ERR("Unable to set permissions on %s", rundir);
4002 perror("chmod");
4003 }
4004
4005 /* lttng client socket path */
4006 ret = chown(client_unix_sock_path, 0, gid);
4007 if (ret < 0) {
4008 ERR("Unable to set group on %s", client_unix_sock_path);
4009 perror("chown");
4010 }
4011
4012 /* kconsumer error socket path */
4013 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4014 if (ret < 0) {
4015 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4016 perror("chown");
4017 }
4018
4019 /* 64-bit ustconsumer error socket path */
4020 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4021 if (ret < 0) {
4022 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4023 perror("chown");
4024 }
4025
4026 /* 32-bit ustconsumer compat32 error socket path */
4027 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4028 if (ret < 0) {
4029 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4030 perror("chown");
4031 }
4032
4033 DBG("All permissions are set");
4034
4035 end:
4036 return ret;
4037 }
4038
4039 /*
4040 * Create the pipe used to wake up the kernel thread.
4041 */
4042 static int create_kernel_poll_pipe(void)
4043 {
4044 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4045 }
4046
4047 /*
4048 * Create the application command pipe to wake thread_manage_apps.
4049 */
4050 static int create_apps_cmd_pipe(void)
4051 {
4052 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4053 }
4054
4055 /*
4056 * Create the lttng run directory needed for all global sockets and pipe.
4057 */
4058 static int create_lttng_rundir(const char *rundir)
4059 {
4060 int ret;
4061
4062 DBG3("Creating LTTng run directory: %s", rundir);
4063
4064 ret = mkdir(rundir, S_IRWXU);
4065 if (ret < 0) {
4066 if (errno != EEXIST) {
4067 ERR("Unable to create %s", rundir);
4068 goto error;
4069 } else {
4070 ret = 0;
4071 }
4072 }
4073
4074 error:
4075 return ret;
4076 }
4077
4078 /*
4079 * Setup sockets and directory needed by the kconsumerd communication with the
4080 * session daemon.
4081 */
4082 static int set_consumer_sockets(struct consumer_data *consumer_data,
4083 const char *rundir)
4084 {
4085 int ret;
4086 char path[PATH_MAX];
4087
4088 switch (consumer_data->type) {
4089 case LTTNG_CONSUMER_KERNEL:
4090 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4091 break;
4092 case LTTNG_CONSUMER64_UST:
4093 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4094 break;
4095 case LTTNG_CONSUMER32_UST:
4096 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4097 break;
4098 default:
4099 ERR("Consumer type unknown");
4100 ret = -EINVAL;
4101 goto error;
4102 }
4103
4104 DBG2("Creating consumer directory: %s", path);
4105
4106 ret = mkdir(path, S_IRWXU);
4107 if (ret < 0) {
4108 if (errno != EEXIST) {
4109 ERR("Failed to create %s", path);
4110 goto error;
4111 }
4112 ret = 0;
4113 }
4114
4115 /* Create the kconsumerd error unix socket */
4116 consumer_data->err_sock =
4117 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4118 if (consumer_data->err_sock < 0) {
4119 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4120 ret = -1;
4121 goto error;
4122 }
4123
4124 /* File permission MUST be 660 */
4125 ret = chmod(consumer_data->err_unix_sock_path,
4126 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4127 if (ret < 0) {
4128 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4129 PERROR("chmod");
4130 goto error;
4131 }
4132
4133 error:
4134 return ret;
4135 }
4136
4137 /*
4138 * Signal handler for the daemon
4139 *
4140 * Simply stop all worker threads, leaving main() return gracefully after
4141 * joining all threads and calling cleanup().
4142 */
4143 static void sighandler(int sig)
4144 {
4145 switch (sig) {
4146 case SIGPIPE:
4147 DBG("SIGPIPE caught");
4148 return;
4149 case SIGINT:
4150 DBG("SIGINT caught");
4151 stop_threads();
4152 break;
4153 case SIGTERM:
4154 DBG("SIGTERM caught");
4155 stop_threads();
4156 break;
4157 default:
4158 break;
4159 }
4160 }
4161
4162 /*
4163 * Setup signal handler for :
4164 * SIGINT, SIGTERM, SIGPIPE
4165 */
4166 static int set_signal_handler(void)
4167 {
4168 int ret = 0;
4169 struct sigaction sa;
4170 sigset_t sigset;
4171
4172 if ((ret = sigemptyset(&sigset)) < 0) {
4173 perror("sigemptyset");
4174 return ret;
4175 }
4176
4177 sa.sa_handler = sighandler;
4178 sa.sa_mask = sigset;
4179 sa.sa_flags = 0;
4180 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4181 perror("sigaction");
4182 return ret;
4183 }
4184
4185 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4186 perror("sigaction");
4187 return ret;
4188 }
4189
4190 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4191 perror("sigaction");
4192 return ret;
4193 }
4194
4195 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4196
4197 return ret;
4198 }
4199
4200 /*
4201 * Set open files limit to unlimited. This daemon can open a large number of
4202 * file descriptors in order to consumer multiple kernel traces.
4203 */
4204 static void set_ulimit(void)
4205 {
4206 int ret;
4207 struct rlimit lim;
4208
4209 /* The kernel does not allowed an infinite limit for open files */
4210 lim.rlim_cur = 65535;
4211 lim.rlim_max = 65535;
4212
4213 ret = setrlimit(RLIMIT_NOFILE, &lim);
4214 if (ret < 0) {
4215 perror("failed to set open files limit");
4216 }
4217 }
4218
4219 /*
4220 * main
4221 */
4222 int main(int argc, char **argv)
4223 {
4224 int ret = 0;
4225 void *status;
4226 const char *home_path;
4227
4228 init_kernel_workarounds();
4229
4230 rcu_register_thread();
4231
4232 /* Create thread quit pipe */
4233 if ((ret = init_thread_quit_pipe()) < 0) {
4234 goto error;
4235 }
4236
4237 setup_consumerd_path();
4238
4239 /* Parse arguments */
4240 progname = argv[0];
4241 if ((ret = parse_args(argc, argv) < 0)) {
4242 goto error;
4243 }
4244
4245 /* Daemonize */
4246 if (opt_daemon) {
4247 ret = daemon(0, 0);
4248 if (ret < 0) {
4249 perror("daemon");
4250 goto error;
4251 }
4252 }
4253
4254 /* Check if daemon is UID = 0 */
4255 is_root = !getuid();
4256
4257 if (is_root) {
4258 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4259
4260 /* Create global run dir with root access */
4261 ret = create_lttng_rundir(rundir);
4262 if (ret < 0) {
4263 goto error;
4264 }
4265
4266 if (strlen(apps_unix_sock_path) == 0) {
4267 snprintf(apps_unix_sock_path, PATH_MAX,
4268 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4269 }
4270
4271 if (strlen(client_unix_sock_path) == 0) {
4272 snprintf(client_unix_sock_path, PATH_MAX,
4273 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4274 }
4275
4276 /* Set global SHM for ust */
4277 if (strlen(wait_shm_path) == 0) {
4278 snprintf(wait_shm_path, PATH_MAX,
4279 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4280 }
4281
4282 /* Setup kernel consumerd path */
4283 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4284 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4285 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4286 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4287
4288 DBG2("Kernel consumer err path: %s",
4289 kconsumer_data.err_unix_sock_path);
4290 DBG2("Kernel consumer cmd path: %s",
4291 kconsumer_data.cmd_unix_sock_path);
4292 } else {
4293 home_path = get_home_dir();
4294 if (home_path == NULL) {
4295 /* TODO: Add --socket PATH option */
4296 ERR("Can't get HOME directory for sockets creation.");
4297 ret = -EPERM;
4298 goto error;
4299 }
4300
4301 /*
4302 * Create rundir from home path. This will create something like
4303 * $HOME/.lttng
4304 */
4305 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4306 if (ret < 0) {
4307 ret = -ENOMEM;
4308 goto error;
4309 }
4310
4311 ret = create_lttng_rundir(rundir);
4312 if (ret < 0) {
4313 goto error;
4314 }
4315
4316 if (strlen(apps_unix_sock_path) == 0) {
4317 snprintf(apps_unix_sock_path, PATH_MAX,
4318 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4319 }
4320
4321 /* Set the cli tool unix socket path */
4322 if (strlen(client_unix_sock_path) == 0) {
4323 snprintf(client_unix_sock_path, PATH_MAX,
4324 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4325 }
4326
4327 /* Set global SHM for ust */
4328 if (strlen(wait_shm_path) == 0) {
4329 snprintf(wait_shm_path, PATH_MAX,
4330 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4331 }
4332 }
4333
4334 DBG("Client socket path %s", client_unix_sock_path);
4335 DBG("Application socket path %s", apps_unix_sock_path);
4336 DBG("LTTng run directory path: %s", rundir);
4337
4338 /* 32 bits consumerd path setup */
4339 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4340 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4341 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4342 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4343
4344 DBG2("UST consumer 32 bits err path: %s",
4345 ustconsumer32_data.err_unix_sock_path);
4346 DBG2("UST consumer 32 bits cmd path: %s",
4347 ustconsumer32_data.cmd_unix_sock_path);
4348
4349 /* 64 bits consumerd path setup */
4350 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4351 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4352 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4353 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4354
4355 DBG2("UST consumer 64 bits err path: %s",
4356 ustconsumer64_data.err_unix_sock_path);
4357 DBG2("UST consumer 64 bits cmd path: %s",
4358 ustconsumer64_data.cmd_unix_sock_path);
4359
4360 /*
4361 * See if daemon already exist.
4362 */
4363 if ((ret = check_existing_daemon()) < 0) {
4364 ERR("Already running daemon.\n");
4365 /*
4366 * We do not goto exit because we must not cleanup()
4367 * because a daemon is already running.
4368 */
4369 goto error;
4370 }
4371
4372 /* After this point, we can safely call cleanup() with "goto exit" */
4373
4374 /*
4375 * These actions must be executed as root. We do that *after* setting up
4376 * the sockets path because we MUST make the check for another daemon using
4377 * those paths *before* trying to set the kernel consumer sockets and init
4378 * kernel tracer.
4379 */
4380 if (is_root) {
4381 ret = set_consumer_sockets(&kconsumer_data, rundir);
4382 if (ret < 0) {
4383 goto exit;
4384 }
4385
4386 /* Setup kernel tracer */
4387 if (!opt_no_kernel) {
4388 init_kernel_tracer();
4389 }
4390
4391 /* Set ulimit for open files */
4392 set_ulimit();
4393 }
4394
4395 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4396 if (ret < 0) {
4397 goto exit;
4398 }
4399
4400 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4401 if (ret < 0) {
4402 goto exit;
4403 }
4404
4405 if ((ret = set_signal_handler()) < 0) {
4406 goto exit;
4407 }
4408
4409 /* Setup the needed unix socket */
4410 if ((ret = init_daemon_socket()) < 0) {
4411 goto exit;
4412 }
4413
4414 /* Set credentials to socket */
4415 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4416 goto exit;
4417 }
4418
4419 /* Get parent pid if -S, --sig-parent is specified. */
4420 if (opt_sig_parent) {
4421 ppid = getppid();
4422 }
4423
4424 /* Setup the kernel pipe for waking up the kernel thread */
4425 if ((ret = create_kernel_poll_pipe()) < 0) {
4426 goto exit;
4427 }
4428
4429 /* Setup the thread apps communication pipe. */
4430 if ((ret = create_apps_cmd_pipe()) < 0) {
4431 goto exit;
4432 }
4433
4434 /* Init UST command queue. */
4435 cds_wfq_init(&ust_cmd_queue.queue);
4436
4437 /* Init UST app hash table */
4438 ust_app_ht_alloc();
4439
4440 /*
4441 * Get session list pointer. This pointer MUST NOT be free(). This list is
4442 * statically declared in session.c
4443 */
4444 session_list_ptr = session_get_list();
4445
4446 /* Set up max poll set size */
4447 lttng_poll_set_max_size();
4448
4449 /* Create thread to manage the client socket */
4450 ret = pthread_create(&client_thread, NULL,
4451 thread_manage_clients, (void *) NULL);
4452 if (ret != 0) {
4453 perror("pthread_create clients");
4454 goto exit_client;
4455 }
4456
4457 /* Create thread to dispatch registration */
4458 ret = pthread_create(&dispatch_thread, NULL,
4459 thread_dispatch_ust_registration, (void *) NULL);
4460 if (ret != 0) {
4461 perror("pthread_create dispatch");
4462 goto exit_dispatch;
4463 }
4464
4465 /* Create thread to manage application registration. */
4466 ret = pthread_create(&reg_apps_thread, NULL,
4467 thread_registration_apps, (void *) NULL);
4468 if (ret != 0) {
4469 perror("pthread_create registration");
4470 goto exit_reg_apps;
4471 }
4472
4473 /* Create thread to manage application socket */
4474 ret = pthread_create(&apps_thread, NULL,
4475 thread_manage_apps, (void *) NULL);
4476 if (ret != 0) {
4477 perror("pthread_create apps");
4478 goto exit_apps;
4479 }
4480
4481 /* Create kernel thread to manage kernel event */
4482 ret = pthread_create(&kernel_thread, NULL,
4483 thread_manage_kernel, (void *) NULL);
4484 if (ret != 0) {
4485 perror("pthread_create kernel");
4486 goto exit_kernel;
4487 }
4488
4489 ret = pthread_join(kernel_thread, &status);
4490 if (ret != 0) {
4491 perror("pthread_join");
4492 goto error; /* join error, exit without cleanup */
4493 }
4494
4495 exit_kernel:
4496 ret = pthread_join(apps_thread, &status);
4497 if (ret != 0) {
4498 perror("pthread_join");
4499 goto error; /* join error, exit without cleanup */
4500 }
4501
4502 exit_apps:
4503 ret = pthread_join(reg_apps_thread, &status);
4504 if (ret != 0) {
4505 perror("pthread_join");
4506 goto error; /* join error, exit without cleanup */
4507 }
4508
4509 exit_reg_apps:
4510 ret = pthread_join(dispatch_thread, &status);
4511 if (ret != 0) {
4512 perror("pthread_join");
4513 goto error; /* join error, exit without cleanup */
4514 }
4515
4516 exit_dispatch:
4517 ret = pthread_join(client_thread, &status);
4518 if (ret != 0) {
4519 perror("pthread_join");
4520 goto error; /* join error, exit without cleanup */
4521 }
4522
4523 ret = join_consumer_thread(&kconsumer_data);
4524 if (ret != 0) {
4525 perror("join_consumer");
4526 goto error; /* join error, exit without cleanup */
4527 }
4528
4529 exit_client:
4530 exit:
4531 /*
4532 * cleanup() is called when no other thread is running.
4533 */
4534 rcu_thread_online();
4535 cleanup();
4536 rcu_thread_offline();
4537 rcu_unregister_thread();
4538 if (!ret) {
4539 exit(EXIT_SUCCESS);
4540 }
4541 error:
4542 exit(EXIT_FAILURE);
4543 }
LTTng 2.0 tools and control repository
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