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