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Merge branch 'master' into benchmark
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 #include "benchmark.h"
79
80 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
83 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86 /* Variables */
87 int opt_verbose; /* Not static for lttngerr.h */
88 int opt_verbose_consumer; /* Not static for lttngerr.h */
89 int opt_quiet; /* Not static for lttngerr.h */
90
91 const char *progname;
92 const char *opt_tracing_group;
93 static int opt_sig_parent;
94 static int opt_daemon;
95 static int opt_no_kernel;
96 static int is_root; /* Set to 1 if the daemon is running as root */
97 static pid_t ppid; /* Parent PID for --sig-parent option */
98 static char *rundir;
99
100 /* Consumer daemon specific control data */
101 static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
103 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
115 };
116
117 static int dispatch_thread_exit;
118
119 /* Global application Unix socket path */
120 static char apps_unix_sock_path[PATH_MAX];
121 /* Global client Unix socket path */
122 static char client_unix_sock_path[PATH_MAX];
123 /* global wait shm path for UST */
124 static char wait_shm_path[PATH_MAX];
125
126 /* Sockets and FDs */
127 static int client_sock;
128 static int apps_sock;
129 static int kernel_tracer_fd;
130 static int kernel_poll_pipe[2];
131
132 /*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136 static int thread_quit_pipe[2];
137
138 /*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142 static int apps_cmd_pipe[2];
143
144 /* Pthread, Mutexes and Semaphores */
145 static pthread_t apps_thread;
146 static pthread_t reg_apps_thread;
147 static pthread_t client_thread;
148 static pthread_t kernel_thread;
149 static pthread_t dispatch_thread;
150
151
152 /*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159 static struct ust_cmd_queue ust_cmd_queue;
160
161 /*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
167 *
168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
169 * session_lock_list and session_unlock_list for lock acquisition.
170 */
171 static struct ltt_session_list *session_list_ptr;
172
173 int ust_consumerd64_fd = -1;
174 int ust_consumerd32_fd = -1;
175
176 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
177 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
178 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
179 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
180
181 static
182 void setup_consumerd_path(void)
183 {
184 const char *bin, *libdir;
185
186 /*
187 * Allow INSTALL_BIN_PATH to be used as a target path for the
188 * native architecture size consumer if CONFIG_CONSUMER*_PATH
189 * has not been defined.
190 */
191 #if (CAA_BITS_PER_LONG == 32)
192 if (!consumerd32_bin[0]) {
193 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
194 }
195 if (!consumerd32_libdir[0]) {
196 consumerd32_libdir = INSTALL_LIB_PATH;
197 }
198 #elif (CAA_BITS_PER_LONG == 64)
199 if (!consumerd64_bin[0]) {
200 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
201 }
202 if (!consumerd64_libdir[0]) {
203 consumerd64_libdir = INSTALL_LIB_PATH;
204 }
205 #else
206 #error "Unknown bitness"
207 #endif
208
209 /*
210 * runtime env. var. overrides the build default.
211 */
212 bin = getenv("LTTNG_CONSUMERD32_BIN");
213 if (bin) {
214 consumerd32_bin = bin;
215 }
216 bin = getenv("LTTNG_CONSUMERD64_BIN");
217 if (bin) {
218 consumerd64_bin = bin;
219 }
220 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
221 if (libdir) {
222 consumerd32_libdir = libdir;
223 }
224 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
225 if (libdir) {
226 consumerd64_libdir = libdir;
227 }
228 }
229
230 /*
231 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
232 */
233 static int create_thread_poll_set(struct lttng_poll_event *events,
234 unsigned int size)
235 {
236 int ret;
237
238 if (events == NULL || size == 0) {
239 ret = -1;
240 goto error;
241 }
242
243 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
244 if (ret < 0) {
245 goto error;
246 }
247
248 /* Add quit pipe */
249 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
250 if (ret < 0) {
251 goto error;
252 }
253
254 return 0;
255
256 error:
257 return ret;
258 }
259
260 /*
261 * Check if the thread quit pipe was triggered.
262 *
263 * Return 1 if it was triggered else 0;
264 */
265 static int check_thread_quit_pipe(int fd, uint32_t events)
266 {
267 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
268 return 1;
269 }
270
271 return 0;
272 }
273
274 /*
275 * Return group ID of the tracing group or -1 if not found.
276 */
277 static gid_t allowed_group(void)
278 {
279 struct group *grp;
280
281 if (opt_tracing_group) {
282 grp = getgrnam(opt_tracing_group);
283 } else {
284 grp = getgrnam(default_tracing_group);
285 }
286 if (!grp) {
287 return -1;
288 } else {
289 return grp->gr_gid;
290 }
291 }
292
293 /*
294 * Init thread quit pipe.
295 *
296 * Return -1 on error or 0 if all pipes are created.
297 */
298 static int init_thread_quit_pipe(void)
299 {
300 int ret;
301
302 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
303 if (ret < 0) {
304 perror("thread quit pipe");
305 goto error;
306 }
307
308 error:
309 return ret;
310 }
311
312 /*
313 * Complete teardown of a kernel session. This free all data structure related
314 * to a kernel session and update counter.
315 */
316 static void teardown_kernel_session(struct ltt_session *session)
317 {
318 if (!session->kernel_session) {
319 DBG3("No kernel session when tearing down session");
320 return;
321 }
322
323 DBG("Tearing down kernel session");
324
325 /*
326 * If a custom kernel consumer was registered, close the socket before
327 * tearing down the complete kernel session structure
328 */
329 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
330 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
331 }
332
333 trace_kernel_destroy_session(session->kernel_session);
334 }
335
336 /*
337 * Complete teardown of all UST sessions. This will free everything on his path
338 * and destroy the core essence of all ust sessions :)
339 */
340 static void teardown_ust_session(struct ltt_session *session)
341 {
342 int ret;
343
344 if (!session->ust_session) {
345 DBG3("No UST session when tearing down session");
346 return;
347 }
348
349 DBG("Tearing down UST session(s)");
350
351 ret = ust_app_destroy_trace_all(session->ust_session);
352 if (ret) {
353 ERR("Error in ust_app_destroy_trace_all");
354 }
355
356 trace_ust_destroy_session(session->ust_session);
357 }
358
359 /*
360 * Stop all threads by closing the thread quit pipe.
361 */
362 static void stop_threads(void)
363 {
364 int ret;
365
366 /* Stopping all threads */
367 DBG("Terminating all threads");
368 ret = notify_thread_pipe(thread_quit_pipe[1]);
369 if (ret < 0) {
370 ERR("write error on thread quit pipe");
371 }
372
373 /* Dispatch thread */
374 dispatch_thread_exit = 1;
375 futex_nto1_wake(&ust_cmd_queue.futex);
376 }
377
378 /*
379 * Cleanup the daemon
380 */
381 static void cleanup(void)
382 {
383 int ret;
384 char *cmd;
385 struct ltt_session *sess, *stmp;
386
387 DBG("Cleaning up");
388
389 DBG("Removing %s directory", rundir);
390 ret = asprintf(&cmd, "rm -rf %s", rundir);
391 if (ret < 0) {
392 ERR("asprintf failed. Something is really wrong!");
393 }
394
395 /* Remove lttng run directory */
396 ret = system(cmd);
397 if (ret < 0) {
398 ERR("Unable to clean %s", rundir);
399 }
400 free(cmd);
401
402 DBG("Cleaning up all sessions");
403
404 /* Destroy session list mutex */
405 if (session_list_ptr != NULL) {
406 pthread_mutex_destroy(&session_list_ptr->lock);
407
408 /* Cleanup ALL session */
409 cds_list_for_each_entry_safe(sess, stmp,
410 &session_list_ptr->head, list) {
411 teardown_kernel_session(sess);
412 teardown_ust_session(sess);
413 free(sess);
414 }
415 }
416
417 DBG("Closing all UST sockets");
418 ust_app_clean_list();
419
420 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
421
422 if (is_root && !opt_no_kernel) {
423 DBG2("Closing kernel fd");
424 close(kernel_tracer_fd);
425 DBG("Unloading kernel modules");
426 modprobe_remove_lttng_all();
427 }
428
429 close(thread_quit_pipe[0]);
430 close(thread_quit_pipe[1]);
431
432 /* OUTPUT BENCHMARK RESULTS */
433 bench_init();
434
435 if (getenv("BENCH_UST_NOTIFY")) {
436 bench_print_ust_notification();
437 }
438
439 if (getenv("BENCH_UST_REGISTER")) {
440 bench_print_ust_register();
441 bench_print_ust_unregister();
442 }
443
444 if (getenv("BENCH_BOOT_PROCESS")) {
445 bench_print_boot_process();
446 }
447
448 bench_close();
449 /* END BENCHMARK */
450
451 /* <fun> */
452 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
453 "Matthew, BEET driven development works!%c[%dm",
454 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
455 /* </fun> */
456 }
457
458 /*
459 * Send data on a unix socket using the liblttsessiondcomm API.
460 *
461 * Return lttcomm error code.
462 */
463 static int send_unix_sock(int sock, void *buf, size_t len)
464 {
465 /* Check valid length */
466 if (len <= 0) {
467 return -1;
468 }
469
470 return lttcomm_send_unix_sock(sock, buf, len);
471 }
472
473 /*
474 * Free memory of a command context structure.
475 */
476 static void clean_command_ctx(struct command_ctx **cmd_ctx)
477 {
478 DBG("Clean command context structure");
479 if (*cmd_ctx) {
480 if ((*cmd_ctx)->llm) {
481 free((*cmd_ctx)->llm);
482 }
483 if ((*cmd_ctx)->lsm) {
484 free((*cmd_ctx)->lsm);
485 }
486 free(*cmd_ctx);
487 *cmd_ctx = NULL;
488 }
489 }
490
491 /*
492 * Send all stream fds of kernel channel to the consumer.
493 */
494 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
495 int sock, struct ltt_kernel_channel *channel,
496 uid_t uid, gid_t gid)
497 {
498 int ret;
499 struct ltt_kernel_stream *stream;
500 struct lttcomm_consumer_msg lkm;
501
502 DBG("Sending streams of channel %s to kernel consumer",
503 channel->channel->name);
504
505 /* Send channel */
506 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
507 lkm.u.channel.channel_key = channel->fd;
508 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
509 lkm.u.channel.mmap_len = 0; /* for kernel */
510 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
511 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
512 if (ret < 0) {
513 perror("send consumer channel");
514 goto error;
515 }
516
517 /* Send streams */
518 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
519 if (!stream->fd) {
520 continue;
521 }
522 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
523 lkm.u.stream.channel_key = channel->fd;
524 lkm.u.stream.stream_key = stream->fd;
525 lkm.u.stream.state = stream->state;
526 lkm.u.stream.output = channel->channel->attr.output;
527 lkm.u.stream.mmap_len = 0; /* for kernel */
528 lkm.u.stream.uid = uid;
529 lkm.u.stream.gid = gid;
530 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
531 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
532 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
533 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
534 if (ret < 0) {
535 perror("send consumer stream");
536 goto error;
537 }
538 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
539 if (ret < 0) {
540 perror("send consumer stream ancillary data");
541 goto error;
542 }
543 }
544
545 DBG("consumer channel streams sent");
546
547 return 0;
548
549 error:
550 return ret;
551 }
552
553 /*
554 * Send all stream fds of the kernel session to the consumer.
555 */
556 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
557 struct ltt_kernel_session *session)
558 {
559 int ret;
560 struct ltt_kernel_channel *chan;
561 struct lttcomm_consumer_msg lkm;
562 int sock = session->consumer_fd;
563
564 DBG("Sending metadata stream fd");
565
566 /* Extra protection. It's NOT supposed to be set to 0 at this point */
567 if (session->consumer_fd == 0) {
568 session->consumer_fd = consumer_data->cmd_sock;
569 }
570
571 if (session->metadata_stream_fd != 0) {
572 /* Send metadata channel fd */
573 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
574 lkm.u.channel.channel_key = session->metadata->fd;
575 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
576 lkm.u.channel.mmap_len = 0; /* for kernel */
577 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
578 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
579 if (ret < 0) {
580 perror("send consumer channel");
581 goto error;
582 }
583
584 /* Send metadata stream fd */
585 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
586 lkm.u.stream.channel_key = session->metadata->fd;
587 lkm.u.stream.stream_key = session->metadata_stream_fd;
588 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
589 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
590 lkm.u.stream.mmap_len = 0; /* for kernel */
591 lkm.u.stream.uid = session->uid;
592 lkm.u.stream.gid = session->gid;
593 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
594 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
595 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
596 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
597 if (ret < 0) {
598 perror("send consumer stream");
599 goto error;
600 }
601 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
602 if (ret < 0) {
603 perror("send consumer stream");
604 goto error;
605 }
606 }
607
608 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
609 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
610 session->uid, session->gid);
611 if (ret < 0) {
612 goto error;
613 }
614 }
615
616 DBG("consumer fds (metadata and channel streams) sent");
617
618 return 0;
619
620 error:
621 return ret;
622 }
623
624 /*
625 * Notify UST applications using the shm mmap futex.
626 */
627 static int notify_ust_apps(int active)
628 {
629 char *wait_shm_mmap;
630
631 DBG("Notifying applications of session daemon state: %d", active);
632
633 tracepoint(ust_notify_apps_start);
634
635 /* See shm.c for this call implying mmap, shm and futex calls */
636 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
637 if (wait_shm_mmap == NULL) {
638 goto error;
639 }
640
641 /* Wake waiting process */
642 futex_wait_update((int32_t *) wait_shm_mmap, active);
643
644 tracepoint(ust_notify_apps_stop);
645
646 /* Apps notified successfully */
647 return 0;
648
649 error:
650 return -1;
651 }
652
653 /*
654 * Setup the outgoing data buffer for the response (llm) by allocating the
655 * right amount of memory and copying the original information from the lsm
656 * structure.
657 *
658 * Return total size of the buffer pointed by buf.
659 */
660 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
661 {
662 int ret, buf_size;
663
664 buf_size = size;
665
666 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
667 if (cmd_ctx->llm == NULL) {
668 perror("zmalloc");
669 ret = -ENOMEM;
670 goto error;
671 }
672
673 /* Copy common data */
674 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
675 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
676
677 cmd_ctx->llm->data_size = size;
678 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
679
680 return buf_size;
681
682 error:
683 return ret;
684 }
685
686 /*
687 * Update the kernel poll set of all channel fd available over all tracing
688 * session. Add the wakeup pipe at the end of the set.
689 */
690 static int update_kernel_poll(struct lttng_poll_event *events)
691 {
692 int ret;
693 struct ltt_session *session;
694 struct ltt_kernel_channel *channel;
695
696 DBG("Updating kernel poll set");
697
698 session_lock_list();
699 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
700 session_lock(session);
701 if (session->kernel_session == NULL) {
702 session_unlock(session);
703 continue;
704 }
705
706 cds_list_for_each_entry(channel,
707 &session->kernel_session->channel_list.head, list) {
708 /* Add channel fd to the kernel poll set */
709 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
710 if (ret < 0) {
711 session_unlock(session);
712 goto error;
713 }
714 DBG("Channel fd %d added to kernel set", channel->fd);
715 }
716 session_unlock(session);
717 }
718 session_unlock_list();
719
720 return 0;
721
722 error:
723 session_unlock_list();
724 return -1;
725 }
726
727 /*
728 * Find the channel fd from 'fd' over all tracing session. When found, check
729 * for new channel stream and send those stream fds to the kernel consumer.
730 *
731 * Useful for CPU hotplug feature.
732 */
733 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
734 {
735 int ret = 0;
736 struct ltt_session *session;
737 struct ltt_kernel_channel *channel;
738
739 DBG("Updating kernel streams for channel fd %d", fd);
740
741 session_lock_list();
742 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
743 session_lock(session);
744 if (session->kernel_session == NULL) {
745 session_unlock(session);
746 continue;
747 }
748
749 /* This is not suppose to be 0 but this is an extra security check */
750 if (session->kernel_session->consumer_fd == 0) {
751 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
752 }
753
754 cds_list_for_each_entry(channel,
755 &session->kernel_session->channel_list.head, list) {
756 if (channel->fd == fd) {
757 DBG("Channel found, updating kernel streams");
758 ret = kernel_open_channel_stream(channel);
759 if (ret < 0) {
760 goto error;
761 }
762
763 /*
764 * Have we already sent fds to the consumer? If yes, it means
765 * that tracing is started so it is safe to send our updated
766 * stream fds.
767 */
768 if (session->kernel_session->consumer_fds_sent == 1) {
769 ret = send_kconsumer_channel_streams(consumer_data,
770 session->kernel_session->consumer_fd, channel,
771 session->uid, session->gid);
772 if (ret < 0) {
773 goto error;
774 }
775 }
776 goto error;
777 }
778 }
779 session_unlock(session);
780 }
781 session_unlock_list();
782 return ret;
783
784 error:
785 session_unlock(session);
786 session_unlock_list();
787 return ret;
788 }
789
790 /*
791 * For each tracing session, update newly registered apps.
792 */
793 static void update_ust_app(int app_sock)
794 {
795 struct ltt_session *sess, *stmp;
796
797 session_lock_list();
798
799 /* For all tracing session(s) */
800 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
801 session_lock(sess);
802 if (sess->ust_session) {
803 ust_app_global_update(sess->ust_session, app_sock);
804 }
805 session_unlock(sess);
806 }
807
808 session_unlock_list();
809 }
810
811 /*
812 * This thread manage event coming from the kernel.
813 *
814 * Features supported in this thread:
815 * -) CPU Hotplug
816 */
817 static void *thread_manage_kernel(void *data)
818 {
819 int ret, i, pollfd, update_poll_flag = 1;
820 uint32_t revents, nb_fd;
821 char tmp;
822 struct lttng_poll_event events;
823
824 tracepoint(sessiond_th_kern_start);
825
826 DBG("Thread manage kernel started");
827
828 ret = create_thread_poll_set(&events, 2);
829 if (ret < 0) {
830 goto error;
831 }
832
833 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
834 if (ret < 0) {
835 goto error;
836 }
837
838 while (1) {
839 if (update_poll_flag == 1) {
840 /*
841 * Reset number of fd in the poll set. Always 2 since there is the thread
842 * quit pipe and the kernel pipe.
843 */
844 events.nb_fd = 2;
845
846 ret = update_kernel_poll(&events);
847 if (ret < 0) {
848 goto error;
849 }
850 update_poll_flag = 0;
851 }
852
853 nb_fd = LTTNG_POLL_GETNB(&events);
854
855 DBG("Thread kernel polling on %d fds", nb_fd);
856
857 /* Zeroed the poll events */
858 lttng_poll_reset(&events);
859
860 tracepoint(sessiond_th_kern_poll);
861
862 /* Poll infinite value of time */
863 ret = lttng_poll_wait(&events, -1);
864 if (ret < 0) {
865 goto error;
866 } else if (ret == 0) {
867 /* Should not happen since timeout is infinite */
868 ERR("Return value of poll is 0 with an infinite timeout.\n"
869 "This should not have happened! Continuing...");
870 continue;
871 }
872
873 for (i = 0; i < nb_fd; i++) {
874 /* Fetch once the poll data */
875 revents = LTTNG_POLL_GETEV(&events, i);
876 pollfd = LTTNG_POLL_GETFD(&events, i);
877
878 /* Thread quit pipe has been closed. Killing thread. */
879 ret = check_thread_quit_pipe(pollfd, revents);
880 if (ret) {
881 goto error;
882 }
883
884 /* Check for data on kernel pipe */
885 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
886 ret = read(kernel_poll_pipe[0], &tmp, 1);
887 update_poll_flag = 1;
888 continue;
889 } else {
890 /*
891 * New CPU detected by the kernel. Adding kernel stream to
892 * kernel session and updating the kernel consumer
893 */
894 if (revents & LPOLLIN) {
895 ret = update_kernel_stream(&kconsumer_data, pollfd);
896 if (ret < 0) {
897 continue;
898 }
899 break;
900 /*
901 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
902 * and unregister kernel stream at this point.
903 */
904 }
905 }
906 }
907 }
908
909 error:
910 DBG("Kernel thread dying");
911 close(kernel_poll_pipe[0]);
912 close(kernel_poll_pipe[1]);
913
914 lttng_poll_clean(&events);
915
916 return NULL;
917 }
918
919 /*
920 * This thread manage the consumer error sent back to the session daemon.
921 */
922 static void *thread_manage_consumer(void *data)
923 {
924 int sock = 0, i, ret, pollfd;
925 uint32_t revents, nb_fd;
926 enum lttcomm_return_code code;
927 struct lttng_poll_event events;
928 struct consumer_data *consumer_data = data;
929
930 tracepoint(sessiond_th_kcon_start);
931
932 DBG("[thread] Manage consumer started");
933
934 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
935 if (ret < 0) {
936 goto error;
937 }
938
939 /*
940 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
941 * Nothing more will be added to this poll set.
942 */
943 ret = create_thread_poll_set(&events, 2);
944 if (ret < 0) {
945 goto error;
946 }
947
948 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
949 if (ret < 0) {
950 goto error;
951 }
952
953 nb_fd = LTTNG_POLL_GETNB(&events);
954
955 tracepoint(sessiond_th_kcon_poll);
956
957 /* Inifinite blocking call, waiting for transmission */
958 ret = lttng_poll_wait(&events, -1);
959 if (ret < 0) {
960 goto error;
961 }
962
963 for (i = 0; i < nb_fd; i++) {
964 /* Fetch once the poll data */
965 revents = LTTNG_POLL_GETEV(&events, i);
966 pollfd = LTTNG_POLL_GETFD(&events, i);
967
968 /* Thread quit pipe has been closed. Killing thread. */
969 ret = check_thread_quit_pipe(pollfd, revents);
970 if (ret) {
971 goto error;
972 }
973
974 /* Event on the registration socket */
975 if (pollfd == consumer_data->err_sock) {
976 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
977 ERR("consumer err socket poll error");
978 goto error;
979 }
980 }
981 }
982
983 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
984 if (sock < 0) {
985 goto error;
986 }
987
988 DBG2("Receiving code from consumer err_sock");
989
990 /* Getting status code from kconsumerd */
991 ret = lttcomm_recv_unix_sock(sock, &code,
992 sizeof(enum lttcomm_return_code));
993 if (ret <= 0) {
994 goto error;
995 }
996
997 if (code == CONSUMERD_COMMAND_SOCK_READY) {
998 consumer_data->cmd_sock =
999 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1000 if (consumer_data->cmd_sock < 0) {
1001 sem_post(&consumer_data->sem);
1002 PERROR("consumer connect");
1003 goto error;
1004 }
1005 /* Signal condition to tell that the kconsumerd is ready */
1006 sem_post(&consumer_data->sem);
1007 DBG("consumer command socket ready");
1008 } else {
1009 ERR("consumer error when waiting for SOCK_READY : %s",
1010 lttcomm_get_readable_code(-code));
1011 goto error;
1012 }
1013
1014 /* Remove the kconsumerd error sock since we've established a connexion */
1015 ret = lttng_poll_del(&events, consumer_data->err_sock);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1021 if (ret < 0) {
1022 goto error;
1023 }
1024
1025 /* Update number of fd */
1026 nb_fd = LTTNG_POLL_GETNB(&events);
1027
1028 /* Inifinite blocking call, waiting for transmission */
1029 ret = lttng_poll_wait(&events, -1);
1030 if (ret < 0) {
1031 goto error;
1032 }
1033
1034 for (i = 0; i < nb_fd; i++) {
1035 /* Fetch once the poll data */
1036 revents = LTTNG_POLL_GETEV(&events, i);
1037 pollfd = LTTNG_POLL_GETFD(&events, i);
1038
1039 /* Thread quit pipe has been closed. Killing thread. */
1040 ret = check_thread_quit_pipe(pollfd, revents);
1041 if (ret) {
1042 goto error;
1043 }
1044
1045 /* Event on the kconsumerd socket */
1046 if (pollfd == sock) {
1047 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1048 ERR("consumer err socket second poll error");
1049 goto error;
1050 }
1051 }
1052 }
1053
1054 /* Wait for any kconsumerd error */
1055 ret = lttcomm_recv_unix_sock(sock, &code,
1056 sizeof(enum lttcomm_return_code));
1057 if (ret <= 0) {
1058 ERR("consumer closed the command socket");
1059 goto error;
1060 }
1061
1062 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1063
1064 error:
1065 DBG("consumer thread dying");
1066 close(consumer_data->err_sock);
1067 close(consumer_data->cmd_sock);
1068 close(sock);
1069
1070 unlink(consumer_data->err_unix_sock_path);
1071 unlink(consumer_data->cmd_unix_sock_path);
1072 consumer_data->pid = 0;
1073
1074 lttng_poll_clean(&events);
1075
1076 return NULL;
1077 }
1078
1079 /*
1080 * This thread manage application communication.
1081 */
1082 static void *thread_manage_apps(void *data)
1083 {
1084 int i, ret, pollfd;
1085 uint32_t revents, nb_fd;
1086 struct ust_command ust_cmd;
1087 struct lttng_poll_event events;
1088
1089 tracepoint(sessiond_th_apps_start);
1090
1091 DBG("[thread] Manage application started");
1092
1093 rcu_register_thread();
1094 rcu_thread_online();
1095
1096 ret = create_thread_poll_set(&events, 2);
1097 if (ret < 0) {
1098 goto error;
1099 }
1100
1101 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1102 if (ret < 0) {
1103 goto error;
1104 }
1105
1106 while (1) {
1107 /* Zeroed the events structure */
1108 lttng_poll_reset(&events);
1109
1110 nb_fd = LTTNG_POLL_GETNB(&events);
1111
1112 DBG("Apps thread polling on %d fds", nb_fd);
1113
1114 tracepoint(sessiond_th_apps_poll);
1115
1116 /* Inifinite blocking call, waiting for transmission */
1117 ret = lttng_poll_wait(&events, -1);
1118 if (ret < 0) {
1119 goto error;
1120 }
1121
1122 for (i = 0; i < nb_fd; i++) {
1123 /* Fetch once the poll data */
1124 revents = LTTNG_POLL_GETEV(&events, i);
1125 pollfd = LTTNG_POLL_GETFD(&events, i);
1126
1127 /* Thread quit pipe has been closed. Killing thread. */
1128 ret = check_thread_quit_pipe(pollfd, revents);
1129 if (ret) {
1130 goto error;
1131 }
1132
1133 /* Inspect the apps cmd pipe */
1134 if (pollfd == apps_cmd_pipe[0]) {
1135 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1136 ERR("Apps command pipe error");
1137 goto error;
1138 } else if (revents & LPOLLIN) {
1139 tracepoint(ust_register_read_start);
1140 /* Empty pipe */
1141 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1142 if (ret < 0 || ret < sizeof(ust_cmd)) {
1143 perror("read apps cmd pipe");
1144 goto error;
1145 }
1146 tracepoint(ust_register_read_stop);
1147
1148 tracepoint(ust_register_add_start);
1149 /* Register applicaton to the session daemon */
1150 ret = ust_app_register(&ust_cmd.reg_msg,
1151 ust_cmd.sock);
1152 if (ret == -ENOMEM) {
1153 goto error;
1154 } else if (ret < 0) {
1155 break;
1156 }
1157 tracepoint(ust_register_add_stop);
1158
1159 tracepoint(ust_register_done_start);
1160 /*
1161 * Validate UST version compatibility.
1162 */
1163 ret = ust_app_validate_version(ust_cmd.sock);
1164 if (ret >= 0) {
1165 /*
1166 * Add channel(s) and event(s) to newly registered apps
1167 * from lttng global UST domain.
1168 */
1169 update_ust_app(ust_cmd.sock);
1170 }
1171
1172 ret = ust_app_register_done(ust_cmd.sock);
1173 if (ret < 0) {
1174 /*
1175 * If the registration is not possible, we simply
1176 * unregister the apps and continue
1177 */
1178 ust_app_unregister(ust_cmd.sock);
1179 } else {
1180 /*
1181 * We just need here to monitor the close of the UST
1182 * socket and poll set monitor those by default.
1183 */
1184 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1185 if (ret < 0) {
1186 goto error;
1187 }
1188
1189 DBG("Apps with sock %d added to poll set",
1190 ust_cmd.sock);
1191 }
1192 tracepoint(ust_register_done_stop);
1193 break;
1194 }
1195 } else {
1196 /*
1197 * At this point, we know that a registered application made
1198 * the event at poll_wait.
1199 */
1200 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1201 tracepoint(ust_unregister_start);
1202
1203 /* Removing from the poll set */
1204 ret = lttng_poll_del(&events, pollfd);
1205 if (ret < 0) {
1206 goto error;
1207 }
1208
1209 /* Socket closed on remote end. */
1210 ust_app_unregister(pollfd);
1211
1212 tracepoint(ust_unregister_stop);
1213 break;
1214 }
1215 }
1216 }
1217 }
1218
1219 error:
1220 DBG("Application communication apps dying");
1221 close(apps_cmd_pipe[0]);
1222 close(apps_cmd_pipe[1]);
1223
1224 lttng_poll_clean(&events);
1225
1226 rcu_thread_offline();
1227 rcu_unregister_thread();
1228 return NULL;
1229 }
1230
1231 /*
1232 * Dispatch request from the registration threads to the application
1233 * communication thread.
1234 */
1235 static void *thread_dispatch_ust_registration(void *data)
1236 {
1237 int ret;
1238 struct cds_wfq_node *node;
1239 struct ust_command *ust_cmd = NULL;
1240
1241 tracepoint(sessiond_th_dispatch_start);
1242
1243 DBG("[thread] Dispatch UST command started");
1244
1245 while (!dispatch_thread_exit) {
1246 /* Atomically prepare the queue futex */
1247 futex_nto1_prepare(&ust_cmd_queue.futex);
1248
1249 do {
1250 tracepoint(sessiond_th_dispatch_block);
1251
1252 /* Dequeue command for registration */
1253 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1254 if (node == NULL) {
1255 DBG("Woken up but nothing in the UST command queue");
1256 /* Continue thread execution */
1257 break;
1258 }
1259
1260 tracepoint(ust_dispatch_register_start);
1261
1262 ust_cmd = caa_container_of(node, struct ust_command, node);
1263
1264 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1265 " gid:%d sock:%d name:%s (version %d.%d)",
1266 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1267 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1268 ust_cmd->sock, ust_cmd->reg_msg.name,
1269 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1270 /*
1271 * Inform apps thread of the new application registration. This
1272 * call is blocking so we can be assured that the data will be read
1273 * at some point in time or wait to the end of the world :)
1274 */
1275 ret = write(apps_cmd_pipe[1], ust_cmd,
1276 sizeof(struct ust_command));
1277 if (ret < 0) {
1278 perror("write apps cmd pipe");
1279 if (errno == EBADF) {
1280 /*
1281 * We can't inform the application thread to process
1282 * registration. We will exit or else application
1283 * registration will not occur and tracing will never
1284 * start.
1285 */
1286 goto error;
1287 }
1288 }
1289 free(ust_cmd);
1290 } while (node != NULL);
1291
1292 tracepoint(ust_dispatch_register_stop);
1293
1294 /* Futex wait on queue. Blocking call on futex() */
1295 futex_nto1_wait(&ust_cmd_queue.futex);
1296 }
1297
1298 error:
1299 DBG("Dispatch thread dying");
1300 return NULL;
1301 }
1302
1303 /*
1304 * This thread manage application registration.
1305 */
1306 static void *thread_registration_apps(void *data)
1307 {
1308 int sock = 0, i, ret, pollfd;
1309 uint32_t revents, nb_fd;
1310 struct lttng_poll_event events;
1311 /*
1312 * Get allocated in this thread, enqueued to a global queue, dequeued and
1313 * freed in the manage apps thread.
1314 */
1315 struct ust_command *ust_cmd = NULL;
1316
1317 tracepoint(sessiond_th_reg_start);
1318
1319 DBG("[thread] Manage application registration started");
1320
1321 ret = lttcomm_listen_unix_sock(apps_sock);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 /*
1327 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1328 * more will be added to this poll set.
1329 */
1330 ret = create_thread_poll_set(&events, 2);
1331 if (ret < 0) {
1332 goto error;
1333 }
1334
1335 /* Add the application registration socket */
1336 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1337 if (ret < 0) {
1338 goto error;
1339 }
1340
1341 /* Notify all applications to register */
1342 ret = notify_ust_apps(1);
1343 if (ret < 0) {
1344 ERR("Failed to notify applications or create the wait shared memory.\n"
1345 "Execution continues but there might be problem for already\n"
1346 "running applications that wishes to register.");
1347 }
1348
1349 while (1) {
1350 DBG("Accepting application registration");
1351
1352 tracepoint(sessiond_th_reg_poll);
1353
1354 nb_fd = LTTNG_POLL_GETNB(&events);
1355
1356 /* Inifinite blocking call, waiting for transmission */
1357 ret = lttng_poll_wait(&events, -1);
1358 if (ret < 0) {
1359 goto error;
1360 }
1361
1362 for (i = 0; i < nb_fd; i++) {
1363 /* Fetch once the poll data */
1364 revents = LTTNG_POLL_GETEV(&events, i);
1365 pollfd = LTTNG_POLL_GETFD(&events, i);
1366
1367 /* Thread quit pipe has been closed. Killing thread. */
1368 ret = check_thread_quit_pipe(pollfd, revents);
1369 if (ret) {
1370 goto error;
1371 }
1372
1373 /* Event on the registration socket */
1374 if (pollfd == apps_sock) {
1375 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1376 ERR("Register apps socket poll error");
1377 goto error;
1378 } else if (revents & LPOLLIN) {
1379 /* Registration starts here. Recording cycles */
1380 tracepoint(ust_register_start);
1381
1382 sock = lttcomm_accept_unix_sock(apps_sock);
1383 if (sock < 0) {
1384 goto error;
1385 }
1386
1387 /* Create UST registration command for enqueuing */
1388 ust_cmd = zmalloc(sizeof(struct ust_command));
1389 if (ust_cmd == NULL) {
1390 perror("ust command zmalloc");
1391 goto error;
1392 }
1393
1394 /*
1395 * Using message-based transmissions to ensure we don't
1396 * have to deal with partially received messages.
1397 */
1398 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1399 sizeof(struct ust_register_msg));
1400 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1401 if (ret < 0) {
1402 perror("lttcomm_recv_unix_sock register apps");
1403 } else {
1404 ERR("Wrong size received on apps register");
1405 }
1406 free(ust_cmd);
1407 close(sock);
1408 continue;
1409 }
1410
1411 ust_cmd->sock = sock;
1412
1413 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1414 " gid:%d sock:%d name:%s (version %d.%d)",
1415 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1416 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1417 ust_cmd->sock, ust_cmd->reg_msg.name,
1418 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1419
1420 /*
1421 * Lock free enqueue the registration request. The red pill
1422 * has been taken! This apps will be part of the *system*.
1423 */
1424 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1425
1426 /*
1427 * Wake the registration queue futex. Implicit memory
1428 * barrier with the exchange in cds_wfq_enqueue.
1429 */
1430 futex_nto1_wake(&ust_cmd_queue.futex);
1431
1432 tracepoint(ust_register_stop);
1433 }
1434 }
1435 }
1436 }
1437
1438 error:
1439 DBG("UST Registration thread dying");
1440
1441 /* Notify that the registration thread is gone */
1442 notify_ust_apps(0);
1443
1444 close(apps_sock);
1445 close(sock);
1446 unlink(apps_unix_sock_path);
1447
1448 lttng_poll_clean(&events);
1449
1450 return NULL;
1451 }
1452
1453 /*
1454 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1455 * exec or it will fails.
1456 */
1457 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1458 {
1459 int ret;
1460 struct timespec timeout;
1461
1462 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1463 timeout.tv_nsec = 0;
1464
1465 /* Setup semaphore */
1466 ret = sem_init(&consumer_data->sem, 0, 0);
1467 if (ret < 0) {
1468 PERROR("sem_init consumer semaphore");
1469 goto error;
1470 }
1471
1472 ret = pthread_create(&consumer_data->thread, NULL,
1473 thread_manage_consumer, consumer_data);
1474 if (ret != 0) {
1475 PERROR("pthread_create consumer");
1476 ret = -1;
1477 goto error;
1478 }
1479
1480 /* Get time for sem_timedwait absolute timeout */
1481 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1482 if (ret < 0) {
1483 PERROR("clock_gettime spawn consumer");
1484 /* Infinite wait for the kconsumerd thread to be ready */
1485 ret = sem_wait(&consumer_data->sem);
1486 } else {
1487 /* Normal timeout if the gettime was successful */
1488 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1489 ret = sem_timedwait(&consumer_data->sem, &timeout);
1490 }
1491
1492 if (ret < 0) {
1493 if (errno == ETIMEDOUT) {
1494 /*
1495 * Call has timed out so we kill the kconsumerd_thread and return
1496 * an error.
1497 */
1498 ERR("The consumer thread was never ready. Killing it");
1499 ret = pthread_cancel(consumer_data->thread);
1500 if (ret < 0) {
1501 PERROR("pthread_cancel consumer thread");
1502 }
1503 } else {
1504 PERROR("semaphore wait failed consumer thread");
1505 }
1506 goto error;
1507 }
1508
1509 pthread_mutex_lock(&consumer_data->pid_mutex);
1510 if (consumer_data->pid == 0) {
1511 ERR("Kconsumerd did not start");
1512 pthread_mutex_unlock(&consumer_data->pid_mutex);
1513 goto error;
1514 }
1515 pthread_mutex_unlock(&consumer_data->pid_mutex);
1516
1517 return 0;
1518
1519 error:
1520 return ret;
1521 }
1522
1523 /*
1524 * Join consumer thread
1525 */
1526 static int join_consumer_thread(struct consumer_data *consumer_data)
1527 {
1528 void *status;
1529 int ret;
1530
1531 if (consumer_data->pid != 0) {
1532 ret = kill(consumer_data->pid, SIGTERM);
1533 if (ret) {
1534 ERR("Error killing consumer daemon");
1535 return ret;
1536 }
1537 return pthread_join(consumer_data->thread, &status);
1538 } else {
1539 return 0;
1540 }
1541 }
1542
1543 /*
1544 * Fork and exec a consumer daemon (consumerd).
1545 *
1546 * Return pid if successful else -1.
1547 */
1548 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1549 {
1550 int ret;
1551 pid_t pid;
1552 const char *consumer_to_use;
1553 const char *verbosity;
1554 struct stat st;
1555
1556 DBG("Spawning consumerd");
1557
1558 pid = fork();
1559 if (pid == 0) {
1560 /*
1561 * Exec consumerd.
1562 */
1563 if (opt_verbose_consumer) {
1564 verbosity = "--verbose";
1565 } else {
1566 verbosity = "--quiet";
1567 }
1568 switch (consumer_data->type) {
1569 case LTTNG_CONSUMER_KERNEL:
1570 /*
1571 * Find out which consumerd to execute. We will first try the
1572 * 64-bit path, then the sessiond's installation directory, and
1573 * fallback on the 32-bit one,
1574 */
1575 DBG3("Looking for a kernel consumer at these locations:");
1576 DBG3(" 1) %s", consumerd64_bin);
1577 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1578 DBG3(" 3) %s", consumerd32_bin);
1579 if (stat(consumerd64_bin, &st) == 0) {
1580 DBG3("Found location #1");
1581 consumer_to_use = consumerd64_bin;
1582 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1583 DBG3("Found location #2");
1584 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1585 } else if (stat(consumerd32_bin, &st) == 0) {
1586 DBG3("Found location #3");
1587 consumer_to_use = consumerd32_bin;
1588 } else {
1589 DBG("Could not find any valid consumerd executable");
1590 break;
1591 }
1592 DBG("Using kernel consumer at: %s", consumer_to_use);
1593 execl(consumer_to_use,
1594 "lttng-consumerd", verbosity, "-k",
1595 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1596 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1597 NULL);
1598 break;
1599 case LTTNG_CONSUMER64_UST:
1600 {
1601 char *tmpnew = NULL;
1602
1603 if (consumerd64_libdir[0] != '\0') {
1604 char *tmp;
1605 size_t tmplen;
1606
1607 tmp = getenv("LD_LIBRARY_PATH");
1608 if (!tmp) {
1609 tmp = "";
1610 }
1611 tmplen = strlen("LD_LIBRARY_PATH=")
1612 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1613 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1614 if (!tmpnew) {
1615 ret = -ENOMEM;
1616 goto error;
1617 }
1618 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1619 strcat(tmpnew, consumerd64_libdir);
1620 if (tmp[0] != '\0') {
1621 strcat(tmpnew, ":");
1622 strcat(tmpnew, tmp);
1623 }
1624 ret = putenv(tmpnew);
1625 if (ret) {
1626 ret = -errno;
1627 goto error;
1628 }
1629 }
1630 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1631 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1632 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1633 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1634 NULL);
1635 if (consumerd64_libdir[0] != '\0') {
1636 free(tmpnew);
1637 }
1638 if (ret) {
1639 goto error;
1640 }
1641 break;
1642 }
1643 case LTTNG_CONSUMER32_UST:
1644 {
1645 char *tmpnew = NULL;
1646
1647 if (consumerd32_libdir[0] != '\0') {
1648 char *tmp;
1649 size_t tmplen;
1650
1651 tmp = getenv("LD_LIBRARY_PATH");
1652 if (!tmp) {
1653 tmp = "";
1654 }
1655 tmplen = strlen("LD_LIBRARY_PATH=")
1656 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1657 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1658 if (!tmpnew) {
1659 ret = -ENOMEM;
1660 goto error;
1661 }
1662 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1663 strcat(tmpnew, consumerd32_libdir);
1664 if (tmp[0] != '\0') {
1665 strcat(tmpnew, ":");
1666 strcat(tmpnew, tmp);
1667 }
1668 ret = putenv(tmpnew);
1669 if (ret) {
1670 ret = -errno;
1671 goto error;
1672 }
1673 }
1674 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1675 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1676 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1677 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1678 NULL);
1679 if (consumerd32_libdir[0] != '\0') {
1680 free(tmpnew);
1681 }
1682 if (ret) {
1683 goto error;
1684 }
1685 break;
1686 }
1687 default:
1688 perror("unknown consumer type");
1689 exit(EXIT_FAILURE);
1690 }
1691 if (errno != 0) {
1692 perror("kernel start consumer exec");
1693 }
1694 exit(EXIT_FAILURE);
1695 } else if (pid > 0) {
1696 ret = pid;
1697 } else {
1698 perror("start consumer fork");
1699 ret = -errno;
1700 }
1701 error:
1702 return ret;
1703 }
1704
1705 /*
1706 * Spawn the consumerd daemon and session daemon thread.
1707 */
1708 static int start_consumerd(struct consumer_data *consumer_data)
1709 {
1710 int ret;
1711
1712 pthread_mutex_lock(&consumer_data->pid_mutex);
1713 if (consumer_data->pid != 0) {
1714 pthread_mutex_unlock(&consumer_data->pid_mutex);
1715 goto end;
1716 }
1717
1718 ret = spawn_consumerd(consumer_data);
1719 if (ret < 0) {
1720 ERR("Spawning consumerd failed");
1721 pthread_mutex_unlock(&consumer_data->pid_mutex);
1722 goto error;
1723 }
1724
1725 /* Setting up the consumer_data pid */
1726 consumer_data->pid = ret;
1727 DBG2("Consumer pid %d", consumer_data->pid);
1728 pthread_mutex_unlock(&consumer_data->pid_mutex);
1729
1730 DBG2("Spawning consumer control thread");
1731 ret = spawn_consumer_thread(consumer_data);
1732 if (ret < 0) {
1733 ERR("Fatal error spawning consumer control thread");
1734 goto error;
1735 }
1736
1737 end:
1738 return 0;
1739
1740 error:
1741 return ret;
1742 }
1743
1744 /*
1745 * Check version of the lttng-modules.
1746 */
1747 static int validate_lttng_modules_version(void)
1748 {
1749 return kernel_validate_version(kernel_tracer_fd);
1750 }
1751
1752 /*
1753 * Setup necessary data for kernel tracer action.
1754 */
1755 static int init_kernel_tracer(void)
1756 {
1757 int ret;
1758
1759 /* Modprobe lttng kernel modules */
1760 ret = modprobe_lttng_control();
1761 if (ret < 0) {
1762 goto error;
1763 }
1764
1765 /* Open debugfs lttng */
1766 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1767 if (kernel_tracer_fd < 0) {
1768 DBG("Failed to open %s", module_proc_lttng);
1769 ret = -1;
1770 goto error_open;
1771 }
1772
1773 /* Validate kernel version */
1774 ret = validate_lttng_modules_version();
1775 if (ret < 0) {
1776 goto error_version;
1777 }
1778
1779 ret = modprobe_lttng_data();
1780 if (ret < 0) {
1781 goto error_modules;
1782 }
1783
1784 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1785 return 0;
1786
1787 error_version:
1788 modprobe_remove_lttng_control();
1789 close(kernel_tracer_fd);
1790 kernel_tracer_fd = 0;
1791 return LTTCOMM_KERN_VERSION;
1792
1793 error_modules:
1794 close(kernel_tracer_fd);
1795
1796 error_open:
1797 modprobe_remove_lttng_control();
1798
1799 error:
1800 WARN("No kernel tracer available");
1801 kernel_tracer_fd = 0;
1802 return LTTCOMM_KERN_NA;
1803 }
1804
1805 /*
1806 * Init tracing by creating trace directory and sending fds kernel consumer.
1807 */
1808 static int init_kernel_tracing(struct ltt_kernel_session *session)
1809 {
1810 int ret = 0;
1811
1812 if (session->consumer_fds_sent == 0) {
1813 /*
1814 * Assign default kernel consumer socket if no consumer assigned to the
1815 * kernel session. At this point, it's NOT suppose to be 0 but this is
1816 * an extra security check.
1817 */
1818 if (session->consumer_fd == 0) {
1819 session->consumer_fd = kconsumer_data.cmd_sock;
1820 }
1821
1822 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1823 if (ret < 0) {
1824 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1825 goto error;
1826 }
1827
1828 session->consumer_fds_sent = 1;
1829 }
1830
1831 error:
1832 return ret;
1833 }
1834
1835 /*
1836 * Create an UST session and add it to the session ust list.
1837 */
1838 static int create_ust_session(struct ltt_session *session,
1839 struct lttng_domain *domain)
1840 {
1841 struct ltt_ust_session *lus = NULL;
1842 int ret;
1843
1844 switch (domain->type) {
1845 case LTTNG_DOMAIN_UST:
1846 break;
1847 default:
1848 ret = LTTCOMM_UNKNOWN_DOMAIN;
1849 goto error;
1850 }
1851
1852 DBG("Creating UST session");
1853
1854 lus = trace_ust_create_session(session->path, session->id, domain);
1855 if (lus == NULL) {
1856 ret = LTTCOMM_UST_SESS_FAIL;
1857 goto error;
1858 }
1859
1860 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1861 session->uid, session->gid);
1862 if (ret < 0) {
1863 if (ret != -EEXIST) {
1864 ERR("Trace directory creation error");
1865 ret = LTTCOMM_UST_SESS_FAIL;
1866 goto error;
1867 }
1868 }
1869
1870 /* The domain type dictate different actions on session creation */
1871 switch (domain->type) {
1872 case LTTNG_DOMAIN_UST:
1873 /* No ustctl for the global UST domain */
1874 break;
1875 default:
1876 ERR("Unknown UST domain on create session %d", domain->type);
1877 goto error;
1878 }
1879 lus->uid = session->uid;
1880 lus->gid = session->gid;
1881 session->ust_session = lus;
1882
1883 return LTTCOMM_OK;
1884
1885 error:
1886 free(lus);
1887 return ret;
1888 }
1889
1890 /*
1891 * Create a kernel tracer session then create the default channel.
1892 */
1893 static int create_kernel_session(struct ltt_session *session)
1894 {
1895 int ret;
1896
1897 DBG("Creating kernel session");
1898
1899 ret = kernel_create_session(session, kernel_tracer_fd);
1900 if (ret < 0) {
1901 ret = LTTCOMM_KERN_SESS_FAIL;
1902 goto error;
1903 }
1904
1905 /* Set kernel consumer socket fd */
1906 if (kconsumer_data.cmd_sock) {
1907 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1908 }
1909
1910 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1911 S_IRWXU | S_IRWXG, session->uid, session->gid);
1912 if (ret < 0) {
1913 if (ret != -EEXIST) {
1914 ERR("Trace directory creation error");
1915 goto error;
1916 }
1917 }
1918 session->kernel_session->uid = session->uid;
1919 session->kernel_session->gid = session->gid;
1920
1921 error:
1922 return ret;
1923 }
1924
1925 /*
1926 * Check if the UID or GID match the session. Root user has access to all
1927 * sessions.
1928 */
1929 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1930 {
1931 if (uid != session->uid && gid != session->gid && uid != 0) {
1932 return 0;
1933 } else {
1934 return 1;
1935 }
1936 }
1937
1938 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1939 {
1940 unsigned int i = 0;
1941 struct ltt_session *session;
1942
1943 DBG("Counting number of available session for UID %d GID %d",
1944 uid, gid);
1945 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1946 /*
1947 * Only list the sessions the user can control.
1948 */
1949 if (!session_access_ok(session, uid, gid)) {
1950 continue;
1951 }
1952 i++;
1953 }
1954 return i;
1955 }
1956
1957 /*
1958 * Using the session list, filled a lttng_session array to send back to the
1959 * client for session listing.
1960 *
1961 * The session list lock MUST be acquired before calling this function. Use
1962 * session_lock_list() and session_unlock_list().
1963 */
1964 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1965 gid_t gid)
1966 {
1967 unsigned int i = 0;
1968 struct ltt_session *session;
1969
1970 DBG("Getting all available session for UID %d GID %d",
1971 uid, gid);
1972 /*
1973 * Iterate over session list and append data after the control struct in
1974 * the buffer.
1975 */
1976 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1977 /*
1978 * Only list the sessions the user can control.
1979 */
1980 if (!session_access_ok(session, uid, gid)) {
1981 continue;
1982 }
1983 strncpy(sessions[i].path, session->path, PATH_MAX);
1984 sessions[i].path[PATH_MAX - 1] = '\0';
1985 strncpy(sessions[i].name, session->name, NAME_MAX);
1986 sessions[i].name[NAME_MAX - 1] = '\0';
1987 sessions[i].enabled = session->enabled;
1988 i++;
1989 }
1990 }
1991
1992 /*
1993 * Fill lttng_channel array of all channels.
1994 */
1995 static void list_lttng_channels(int domain, struct ltt_session *session,
1996 struct lttng_channel *channels)
1997 {
1998 int i = 0;
1999 struct ltt_kernel_channel *kchan;
2000
2001 DBG("Listing channels for session %s", session->name);
2002
2003 switch (domain) {
2004 case LTTNG_DOMAIN_KERNEL:
2005 /* Kernel channels */
2006 if (session->kernel_session != NULL) {
2007 cds_list_for_each_entry(kchan,
2008 &session->kernel_session->channel_list.head, list) {
2009 /* Copy lttng_channel struct to array */
2010 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2011 channels[i].enabled = kchan->enabled;
2012 i++;
2013 }
2014 }
2015 break;
2016 case LTTNG_DOMAIN_UST:
2017 {
2018 struct lttng_ht_iter iter;
2019 struct ltt_ust_channel *uchan;
2020
2021 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2022 &iter.iter, uchan, node.node) {
2023 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2024 channels[i].attr.overwrite = uchan->attr.overwrite;
2025 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2026 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2027 channels[i].attr.switch_timer_interval =
2028 uchan->attr.switch_timer_interval;
2029 channels[i].attr.read_timer_interval =
2030 uchan->attr.read_timer_interval;
2031 channels[i].enabled = uchan->enabled;
2032 switch (uchan->attr.output) {
2033 case LTTNG_UST_MMAP:
2034 default:
2035 channels[i].attr.output = LTTNG_EVENT_MMAP;
2036 break;
2037 }
2038 i++;
2039 }
2040 break;
2041 }
2042 default:
2043 break;
2044 }
2045 }
2046
2047 /*
2048 * Create a list of ust global domain events.
2049 */
2050 static int list_lttng_ust_global_events(char *channel_name,
2051 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2052 {
2053 int i = 0, ret = 0;
2054 unsigned int nb_event = 0;
2055 struct lttng_ht_iter iter;
2056 struct lttng_ht_node_str *node;
2057 struct ltt_ust_channel *uchan;
2058 struct ltt_ust_event *uevent;
2059 struct lttng_event *tmp;
2060
2061 DBG("Listing UST global events for channel %s", channel_name);
2062
2063 rcu_read_lock();
2064
2065 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2066 node = lttng_ht_iter_get_node_str(&iter);
2067 if (node == NULL) {
2068 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2069 goto error;
2070 }
2071
2072 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2073
2074 nb_event += lttng_ht_get_count(uchan->events);
2075
2076 if (nb_event == 0) {
2077 ret = nb_event;
2078 goto error;
2079 }
2080
2081 DBG3("Listing UST global %d events", nb_event);
2082
2083 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2084 if (tmp == NULL) {
2085 ret = -LTTCOMM_FATAL;
2086 goto error;
2087 }
2088
2089 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2090 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2091 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2092 tmp[i].enabled = uevent->enabled;
2093 switch (uevent->attr.instrumentation) {
2094 case LTTNG_UST_TRACEPOINT:
2095 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2096 break;
2097 case LTTNG_UST_PROBE:
2098 tmp[i].type = LTTNG_EVENT_PROBE;
2099 break;
2100 case LTTNG_UST_FUNCTION:
2101 tmp[i].type = LTTNG_EVENT_FUNCTION;
2102 break;
2103 }
2104 tmp[i].loglevel = uevent->attr.loglevel;
2105 switch (uevent->attr.loglevel_type) {
2106 case LTTNG_UST_LOGLEVEL_ALL:
2107 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2108 break;
2109 case LTTNG_UST_LOGLEVEL_RANGE:
2110 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2111 break;
2112 case LTTNG_UST_LOGLEVEL_SINGLE:
2113 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2114 break;
2115 }
2116 i++;
2117 }
2118
2119 ret = nb_event;
2120 *events = tmp;
2121
2122 error:
2123 rcu_read_unlock();
2124 return ret;
2125 }
2126
2127 /*
2128 * Fill lttng_event array of all kernel events in the channel.
2129 */
2130 static int list_lttng_kernel_events(char *channel_name,
2131 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2132 {
2133 int i = 0, ret;
2134 unsigned int nb_event;
2135 struct ltt_kernel_event *event;
2136 struct ltt_kernel_channel *kchan;
2137
2138 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2139 if (kchan == NULL) {
2140 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2141 goto error;
2142 }
2143
2144 nb_event = kchan->event_count;
2145
2146 DBG("Listing events for channel %s", kchan->channel->name);
2147
2148 if (nb_event == 0) {
2149 ret = nb_event;
2150 goto error;
2151 }
2152
2153 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2154 if (*events == NULL) {
2155 ret = LTTCOMM_FATAL;
2156 goto error;
2157 }
2158
2159 /* Kernel channels */
2160 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2161 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2162 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2163 (*events)[i].enabled = event->enabled;
2164 switch (event->event->instrumentation) {
2165 case LTTNG_KERNEL_TRACEPOINT:
2166 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2167 break;
2168 case LTTNG_KERNEL_KPROBE:
2169 case LTTNG_KERNEL_KRETPROBE:
2170 (*events)[i].type = LTTNG_EVENT_PROBE;
2171 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2172 sizeof(struct lttng_kernel_kprobe));
2173 break;
2174 case LTTNG_KERNEL_FUNCTION:
2175 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2176 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2177 sizeof(struct lttng_kernel_function));
2178 break;
2179 case LTTNG_KERNEL_NOOP:
2180 (*events)[i].type = LTTNG_EVENT_NOOP;
2181 break;
2182 case LTTNG_KERNEL_SYSCALL:
2183 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2184 break;
2185 case LTTNG_KERNEL_ALL:
2186 assert(0);
2187 break;
2188 }
2189 i++;
2190 }
2191
2192 return nb_event;
2193
2194 error:
2195 return ret;
2196 }
2197
2198 /*
2199 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2200 */
2201 static int cmd_disable_channel(struct ltt_session *session,
2202 int domain, char *channel_name)
2203 {
2204 int ret;
2205 struct ltt_ust_session *usess;
2206
2207 usess = session->ust_session;
2208
2209 switch (domain) {
2210 case LTTNG_DOMAIN_KERNEL:
2211 {
2212 ret = channel_kernel_disable(session->kernel_session,
2213 channel_name);
2214 if (ret != LTTCOMM_OK) {
2215 goto error;
2216 }
2217
2218 kernel_wait_quiescent(kernel_tracer_fd);
2219 break;
2220 }
2221 case LTTNG_DOMAIN_UST:
2222 {
2223 struct ltt_ust_channel *uchan;
2224 struct lttng_ht *chan_ht;
2225
2226 chan_ht = usess->domain_global.channels;
2227
2228 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2229 if (uchan == NULL) {
2230 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2231 goto error;
2232 }
2233
2234 ret = channel_ust_disable(usess, domain, uchan);
2235 if (ret != LTTCOMM_OK) {
2236 goto error;
2237 }
2238 break;
2239 }
2240 #if 0
2241 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2242 case LTTNG_DOMAIN_UST_EXEC_NAME:
2243 case LTTNG_DOMAIN_UST_PID:
2244 #endif
2245 default:
2246 ret = LTTCOMM_UNKNOWN_DOMAIN;
2247 goto error;
2248 }
2249
2250 ret = LTTCOMM_OK;
2251
2252 error:
2253 return ret;
2254 }
2255
2256 /*
2257 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2258 */
2259 static int cmd_enable_channel(struct ltt_session *session,
2260 int domain, struct lttng_channel *attr)
2261 {
2262 int ret;
2263 struct ltt_ust_session *usess = session->ust_session;
2264 struct lttng_ht *chan_ht;
2265
2266 DBG("Enabling channel %s for session %s", attr->name, session->name);
2267
2268 switch (domain) {
2269 case LTTNG_DOMAIN_KERNEL:
2270 {
2271 struct ltt_kernel_channel *kchan;
2272
2273 kchan = trace_kernel_get_channel_by_name(attr->name,
2274 session->kernel_session);
2275 if (kchan == NULL) {
2276 ret = channel_kernel_create(session->kernel_session,
2277 attr, kernel_poll_pipe[1]);
2278 } else {
2279 ret = channel_kernel_enable(session->kernel_session, kchan);
2280 }
2281
2282 if (ret != LTTCOMM_OK) {
2283 goto error;
2284 }
2285
2286 kernel_wait_quiescent(kernel_tracer_fd);
2287 break;
2288 }
2289 case LTTNG_DOMAIN_UST:
2290 {
2291 struct ltt_ust_channel *uchan;
2292
2293 chan_ht = usess->domain_global.channels;
2294
2295 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2296 if (uchan == NULL) {
2297 ret = channel_ust_create(usess, domain, attr);
2298 } else {
2299 ret = channel_ust_enable(usess, domain, uchan);
2300 }
2301 break;
2302 }
2303 #if 0
2304 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2305 case LTTNG_DOMAIN_UST_EXEC_NAME:
2306 case LTTNG_DOMAIN_UST_PID:
2307 #endif
2308 default:
2309 ret = LTTCOMM_UNKNOWN_DOMAIN;
2310 goto error;
2311 }
2312
2313 error:
2314 return ret;
2315 }
2316
2317 /*
2318 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2319 */
2320 static int cmd_disable_event(struct ltt_session *session, int domain,
2321 char *channel_name, char *event_name)
2322 {
2323 int ret;
2324
2325 switch (domain) {
2326 case LTTNG_DOMAIN_KERNEL:
2327 {
2328 struct ltt_kernel_channel *kchan;
2329 struct ltt_kernel_session *ksess;
2330
2331 ksess = session->kernel_session;
2332
2333 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2334 if (kchan == NULL) {
2335 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2336 goto error;
2337 }
2338
2339 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2340 if (ret != LTTCOMM_OK) {
2341 goto error;
2342 }
2343
2344 kernel_wait_quiescent(kernel_tracer_fd);
2345 break;
2346 }
2347 case LTTNG_DOMAIN_UST:
2348 {
2349 struct ltt_ust_channel *uchan;
2350 struct ltt_ust_session *usess;
2351
2352 usess = session->ust_session;
2353
2354 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2355 channel_name);
2356 if (uchan == NULL) {
2357 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2358 goto error;
2359 }
2360
2361 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2362 if (ret != LTTCOMM_OK) {
2363 goto error;
2364 }
2365
2366 DBG3("Disable UST event %s in channel %s completed", event_name,
2367 channel_name);
2368 break;
2369 }
2370 #if 0
2371 case LTTNG_DOMAIN_UST_EXEC_NAME:
2372 case LTTNG_DOMAIN_UST_PID:
2373 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2374 #endif
2375 default:
2376 ret = LTTCOMM_UND;
2377 goto error;
2378 }
2379
2380 ret = LTTCOMM_OK;
2381
2382 error:
2383 return ret;
2384 }
2385
2386 /*
2387 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2388 */
2389 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2390 char *channel_name)
2391 {
2392 int ret;
2393
2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
2396 {
2397 struct ltt_kernel_session *ksess;
2398 struct ltt_kernel_channel *kchan;
2399
2400 ksess = session->kernel_session;
2401
2402 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2403 if (kchan == NULL) {
2404 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2405 goto error;
2406 }
2407
2408 ret = event_kernel_disable_all(ksess, kchan);
2409 if (ret != LTTCOMM_OK) {
2410 goto error;
2411 }
2412
2413 kernel_wait_quiescent(kernel_tracer_fd);
2414 break;
2415 }
2416 case LTTNG_DOMAIN_UST:
2417 {
2418 struct ltt_ust_session *usess;
2419 struct ltt_ust_channel *uchan;
2420
2421 usess = session->ust_session;
2422
2423 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2424 channel_name);
2425 if (uchan == NULL) {
2426 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2427 goto error;
2428 }
2429
2430 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2431 if (ret != 0) {
2432 goto error;
2433 }
2434
2435 DBG3("Disable all UST events in channel %s completed", channel_name);
2436
2437 break;
2438 }
2439 #if 0
2440 case LTTNG_DOMAIN_UST_EXEC_NAME:
2441 case LTTNG_DOMAIN_UST_PID:
2442 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2443 #endif
2444 default:
2445 ret = LTTCOMM_UND;
2446 goto error;
2447 }
2448
2449 ret = LTTCOMM_OK;
2450
2451 error:
2452 return ret;
2453 }
2454
2455 /*
2456 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2457 */
2458 static int cmd_add_context(struct ltt_session *session, int domain,
2459 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2460 {
2461 int ret;
2462
2463 switch (domain) {
2464 case LTTNG_DOMAIN_KERNEL:
2465 /* Add kernel context to kernel tracer */
2466 ret = context_kernel_add(session->kernel_session, ctx,
2467 event_name, channel_name);
2468 if (ret != LTTCOMM_OK) {
2469 goto error;
2470 }
2471 break;
2472 case LTTNG_DOMAIN_UST:
2473 {
2474 struct ltt_ust_session *usess = session->ust_session;
2475
2476 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2477 if (ret != LTTCOMM_OK) {
2478 goto error;
2479 }
2480 break;
2481 }
2482 #if 0
2483 case LTTNG_DOMAIN_UST_EXEC_NAME:
2484 case LTTNG_DOMAIN_UST_PID:
2485 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2486 #endif
2487 default:
2488 ret = LTTCOMM_UND;
2489 goto error;
2490 }
2491
2492 ret = LTTCOMM_OK;
2493
2494 error:
2495 return ret;
2496 }
2497
2498 /*
2499 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2500 */
2501 static int cmd_enable_event(struct ltt_session *session, int domain,
2502 char *channel_name, struct lttng_event *event)
2503 {
2504 int ret;
2505 struct lttng_channel *attr;
2506 struct ltt_ust_session *usess = session->ust_session;
2507
2508 switch (domain) {
2509 case LTTNG_DOMAIN_KERNEL:
2510 {
2511 struct ltt_kernel_channel *kchan;
2512
2513 kchan = trace_kernel_get_channel_by_name(channel_name,
2514 session->kernel_session);
2515 if (kchan == NULL) {
2516 attr = channel_new_default_attr(domain);
2517 if (attr == NULL) {
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
2521 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2522
2523 /* This call will notify the kernel thread */
2524 ret = channel_kernel_create(session->kernel_session,
2525 attr, kernel_poll_pipe[1]);
2526 if (ret != LTTCOMM_OK) {
2527 free(attr);
2528 goto error;
2529 }
2530 free(attr);
2531 }
2532
2533 /* Get the newly created kernel channel pointer */
2534 kchan = trace_kernel_get_channel_by_name(channel_name,
2535 session->kernel_session);
2536 if (kchan == NULL) {
2537 /* This sould not happen... */
2538 ret = LTTCOMM_FATAL;
2539 goto error;
2540 }
2541
2542 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2543 event);
2544 if (ret != LTTCOMM_OK) {
2545 goto error;
2546 }
2547
2548 kernel_wait_quiescent(kernel_tracer_fd);
2549 break;
2550 }
2551 case LTTNG_DOMAIN_UST:
2552 {
2553 struct lttng_channel *attr;
2554 struct ltt_ust_channel *uchan;
2555
2556 /* Get channel from global UST domain */
2557 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2558 channel_name);
2559 if (uchan == NULL) {
2560 /* Create default channel */
2561 attr = channel_new_default_attr(domain);
2562 if (attr == NULL) {
2563 ret = LTTCOMM_FATAL;
2564 goto error;
2565 }
2566 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2567 attr->name[NAME_MAX - 1] = '\0';
2568
2569 ret = channel_ust_create(usess, domain, attr);
2570 if (ret != LTTCOMM_OK) {
2571 free(attr);
2572 goto error;
2573 }
2574 free(attr);
2575
2576 /* Get the newly created channel reference back */
2577 uchan = trace_ust_find_channel_by_name(
2578 usess->domain_global.channels, channel_name);
2579 if (uchan == NULL) {
2580 /* Something is really wrong */
2581 ret = LTTCOMM_FATAL;
2582 goto error;
2583 }
2584 }
2585
2586 /* At this point, the session and channel exist on the tracer */
2587 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2588 if (ret != LTTCOMM_OK) {
2589 goto error;
2590 }
2591 break;
2592 }
2593 #if 0
2594 case LTTNG_DOMAIN_UST_EXEC_NAME:
2595 case LTTNG_DOMAIN_UST_PID:
2596 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2597 #endif
2598 default:
2599 ret = LTTCOMM_UND;
2600 goto error;
2601 }
2602
2603 ret = LTTCOMM_OK;
2604
2605 error:
2606 return ret;
2607 }
2608
2609 /*
2610 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2611 */
2612 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2613 char *channel_name, int event_type)
2614 {
2615 int ret;
2616 struct ltt_kernel_channel *kchan;
2617
2618 switch (domain) {
2619 case LTTNG_DOMAIN_KERNEL:
2620 kchan = trace_kernel_get_channel_by_name(channel_name,
2621 session->kernel_session);
2622 if (kchan == NULL) {
2623 /* This call will notify the kernel thread */
2624 ret = channel_kernel_create(session->kernel_session, NULL,
2625 kernel_poll_pipe[1]);
2626 if (ret != LTTCOMM_OK) {
2627 goto error;
2628 }
2629
2630 /* Get the newly created kernel channel pointer */
2631 kchan = trace_kernel_get_channel_by_name(channel_name,
2632 session->kernel_session);
2633 if (kchan == NULL) {
2634 /* This sould not happen... */
2635 ret = LTTCOMM_FATAL;
2636 goto error;
2637 }
2638
2639 }
2640
2641 switch (event_type) {
2642 case LTTNG_EVENT_SYSCALL:
2643 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2644 kchan, kernel_tracer_fd);
2645 break;
2646 case LTTNG_EVENT_TRACEPOINT:
2647 /*
2648 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2649 * events already registered to the channel.
2650 */
2651 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2652 kchan, kernel_tracer_fd);
2653 break;
2654 case LTTNG_EVENT_ALL:
2655 /* Enable syscalls and tracepoints */
2656 ret = event_kernel_enable_all(session->kernel_session,
2657 kchan, kernel_tracer_fd);
2658 break;
2659 default:
2660 ret = LTTCOMM_KERN_ENABLE_FAIL;
2661 goto error;
2662 }
2663
2664 /* Manage return value */
2665 if (ret != LTTCOMM_OK) {
2666 goto error;
2667 }
2668
2669 kernel_wait_quiescent(kernel_tracer_fd);
2670 break;
2671 case LTTNG_DOMAIN_UST:
2672 {
2673 struct lttng_channel *attr;
2674 struct ltt_ust_channel *uchan;
2675 struct ltt_ust_session *usess = session->ust_session;
2676
2677 /* Get channel from global UST domain */
2678 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2679 channel_name);
2680 if (uchan == NULL) {
2681 /* Create default channel */
2682 attr = channel_new_default_attr(domain);
2683 if (attr == NULL) {
2684 ret = LTTCOMM_FATAL;
2685 goto error;
2686 }
2687 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2688 attr->name[NAME_MAX - 1] = '\0';
2689
2690 /* Use the internal command enable channel */
2691 ret = channel_ust_create(usess, domain, attr);
2692 if (ret != LTTCOMM_OK) {
2693 free(attr);
2694 goto error;
2695 }
2696 free(attr);
2697
2698 /* Get the newly created channel reference back */
2699 uchan = trace_ust_find_channel_by_name(
2700 usess->domain_global.channels, channel_name);
2701 if (uchan == NULL) {
2702 /* Something is really wrong */
2703 ret = LTTCOMM_FATAL;
2704 goto error;
2705 }
2706 }
2707
2708 /* At this point, the session and channel exist on the tracer */
2709
2710 switch (event_type) {
2711 case LTTNG_EVENT_ALL:
2712 case LTTNG_EVENT_TRACEPOINT:
2713 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2714 if (ret != LTTCOMM_OK) {
2715 goto error;
2716 }
2717 break;
2718 default:
2719 ret = LTTCOMM_UST_ENABLE_FAIL;
2720 goto error;
2721 }
2722
2723 /* Manage return value */
2724 if (ret != LTTCOMM_OK) {
2725 goto error;
2726 }
2727
2728 break;
2729 }
2730 #if 0
2731 case LTTNG_DOMAIN_UST_EXEC_NAME:
2732 case LTTNG_DOMAIN_UST_PID:
2733 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2734 #endif
2735 default:
2736 ret = LTTCOMM_UND;
2737 goto error;
2738 }
2739
2740 ret = LTTCOMM_OK;
2741
2742 error:
2743 return ret;
2744 }
2745
2746 /*
2747 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2748 */
2749 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2750 {
2751 int ret;
2752 ssize_t nb_events = 0;
2753
2754 switch (domain) {
2755 case LTTNG_DOMAIN_KERNEL:
2756 nb_events = kernel_list_events(kernel_tracer_fd, events);
2757 if (nb_events < 0) {
2758 ret = LTTCOMM_KERN_LIST_FAIL;
2759 goto error;
2760 }
2761 break;
2762 case LTTNG_DOMAIN_UST:
2763 nb_events = ust_app_list_events(events);
2764 if (nb_events < 0) {
2765 ret = LTTCOMM_UST_LIST_FAIL;
2766 goto error;
2767 }
2768 break;
2769 default:
2770 ret = LTTCOMM_UND;
2771 goto error;
2772 }
2773
2774 return nb_events;
2775
2776 error:
2777 /* Return negative value to differentiate return code */
2778 return -ret;
2779 }
2780
2781 /*
2782 * Command LTTNG_START_TRACE processed by the client thread.
2783 */
2784 static int cmd_start_trace(struct ltt_session *session)
2785 {
2786 int ret;
2787 struct ltt_kernel_session *ksession;
2788 struct ltt_ust_session *usess;
2789
2790 /* Short cut */
2791 ksession = session->kernel_session;
2792 usess = session->ust_session;
2793
2794 if (session->enabled) {
2795 ret = LTTCOMM_UST_START_FAIL;
2796 goto error;
2797 }
2798
2799 session->enabled = 1;
2800
2801 /* Kernel tracing */
2802 if (ksession != NULL) {
2803 struct ltt_kernel_channel *kchan;
2804
2805 /* Open kernel metadata */
2806 if (ksession->metadata == NULL) {
2807 ret = kernel_open_metadata(ksession, ksession->trace_path);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_META_FAIL;
2810 goto error;
2811 }
2812 }
2813
2814 /* Open kernel metadata stream */
2815 if (ksession->metadata_stream_fd == 0) {
2816 ret = kernel_open_metadata_stream(ksession);
2817 if (ret < 0) {
2818 ERR("Kernel create metadata stream failed");
2819 ret = LTTCOMM_KERN_STREAM_FAIL;
2820 goto error;
2821 }
2822 }
2823
2824 /* For each channel */
2825 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2826 if (kchan->stream_count == 0) {
2827 ret = kernel_open_channel_stream(kchan);
2828 if (ret < 0) {
2829 ret = LTTCOMM_KERN_STREAM_FAIL;
2830 goto error;
2831 }
2832 /* Update the stream global counter */
2833 ksession->stream_count_global += ret;
2834 }
2835 }
2836
2837 /* Setup kernel consumer socket and send fds to it */
2838 ret = init_kernel_tracing(ksession);
2839 if (ret < 0) {
2840 ret = LTTCOMM_KERN_START_FAIL;
2841 goto error;
2842 }
2843
2844 /* This start the kernel tracing */
2845 ret = kernel_start_session(ksession);
2846 if (ret < 0) {
2847 ret = LTTCOMM_KERN_START_FAIL;
2848 goto error;
2849 }
2850
2851 /* Quiescent wait after starting trace */
2852 kernel_wait_quiescent(kernel_tracer_fd);
2853 }
2854
2855 /* Flag session that trace should start automatically */
2856 if (usess) {
2857 usess->start_trace = 1;
2858
2859 ret = ust_app_start_trace_all(usess);
2860 if (ret < 0) {
2861 ret = LTTCOMM_UST_START_FAIL;
2862 goto error;
2863 }
2864 }
2865
2866 ret = LTTCOMM_OK;
2867
2868 error:
2869 return ret;
2870 }
2871
2872 /*
2873 * Command LTTNG_STOP_TRACE processed by the client thread.
2874 */
2875 static int cmd_stop_trace(struct ltt_session *session)
2876 {
2877 int ret;
2878 struct ltt_kernel_channel *kchan;
2879 struct ltt_kernel_session *ksession;
2880 struct ltt_ust_session *usess;
2881
2882 /* Short cut */
2883 ksession = session->kernel_session;
2884 usess = session->ust_session;
2885
2886 if (!session->enabled) {
2887 ret = LTTCOMM_UST_STOP_FAIL;
2888 goto error;
2889 }
2890
2891 session->enabled = 0;
2892
2893 /* Kernel tracer */
2894 if (ksession != NULL) {
2895 DBG("Stop kernel tracing");
2896
2897 /* Flush all buffers before stopping */
2898 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2899 if (ret < 0) {
2900 ERR("Kernel metadata flush failed");
2901 }
2902
2903 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2904 ret = kernel_flush_buffer(kchan);
2905 if (ret < 0) {
2906 ERR("Kernel flush buffer error");
2907 }
2908 }
2909
2910 ret = kernel_stop_session(ksession);
2911 if (ret < 0) {
2912 ret = LTTCOMM_KERN_STOP_FAIL;
2913 goto error;
2914 }
2915
2916 kernel_wait_quiescent(kernel_tracer_fd);
2917 }
2918
2919 if (usess) {
2920 usess->start_trace = 0;
2921
2922 ret = ust_app_stop_trace_all(usess);
2923 if (ret < 0) {
2924 ret = LTTCOMM_UST_STOP_FAIL;
2925 goto error;
2926 }
2927 }
2928
2929 ret = LTTCOMM_OK;
2930
2931 error:
2932 return ret;
2933 }
2934
2935 /*
2936 * Command LTTNG_CREATE_SESSION processed by the client thread.
2937 */
2938 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2939 {
2940 int ret;
2941
2942 ret = session_create(name, path, creds->uid, creds->gid);
2943 if (ret != LTTCOMM_OK) {
2944 goto error;
2945 }
2946
2947 ret = LTTCOMM_OK;
2948
2949 error:
2950 return ret;
2951 }
2952
2953 /*
2954 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2955 */
2956 static int cmd_destroy_session(struct ltt_session *session, char *name)
2957 {
2958 int ret;
2959
2960 /* Clean kernel session teardown */
2961 teardown_kernel_session(session);
2962 /* UST session teardown */
2963 teardown_ust_session(session);
2964
2965 /*
2966 * Must notify the kernel thread here to update it's poll setin order
2967 * to remove the channel(s)' fd just destroyed.
2968 */
2969 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2970 if (ret < 0) {
2971 perror("write kernel poll pipe");
2972 }
2973
2974 ret = session_destroy(session);
2975
2976 return ret;
2977 }
2978
2979 /*
2980 * Command LTTNG_CALIBRATE processed by the client thread.
2981 */
2982 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2983 {
2984 int ret;
2985
2986 switch (domain) {
2987 case LTTNG_DOMAIN_KERNEL:
2988 {
2989 struct lttng_kernel_calibrate kcalibrate;
2990
2991 kcalibrate.type = calibrate->type;
2992 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2993 if (ret < 0) {
2994 ret = LTTCOMM_KERN_ENABLE_FAIL;
2995 goto error;
2996 }
2997 break;
2998 }
2999 case LTTNG_DOMAIN_UST:
3000 {
3001 struct lttng_ust_calibrate ucalibrate;
3002
3003 ucalibrate.type = calibrate->type;
3004 ret = ust_app_calibrate_glb(&ucalibrate);
3005 if (ret < 0) {
3006 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3007 goto error;
3008 }
3009 break;
3010 }
3011 default:
3012 ret = LTTCOMM_UND;
3013 goto error;
3014 }
3015
3016 ret = LTTCOMM_OK;
3017
3018 error:
3019 return ret;
3020 }
3021
3022 /*
3023 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3024 */
3025 static int cmd_register_consumer(struct ltt_session *session, int domain,
3026 char *sock_path)
3027 {
3028 int ret, sock;
3029
3030 switch (domain) {
3031 case LTTNG_DOMAIN_KERNEL:
3032 /* Can't register a consumer if there is already one */
3033 if (session->kernel_session->consumer_fds_sent != 0) {
3034 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3035 goto error;
3036 }
3037
3038 sock = lttcomm_connect_unix_sock(sock_path);
3039 if (sock < 0) {
3040 ret = LTTCOMM_CONNECT_FAIL;
3041 goto error;
3042 }
3043
3044 session->kernel_session->consumer_fd = sock;
3045 break;
3046 default:
3047 /* TODO: Userspace tracing */
3048 ret = LTTCOMM_UND;
3049 goto error;
3050 }
3051
3052 ret = LTTCOMM_OK;
3053
3054 error:
3055 return ret;
3056 }
3057
3058 /*
3059 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3060 */
3061 static ssize_t cmd_list_domains(struct ltt_session *session,
3062 struct lttng_domain **domains)
3063 {
3064 int ret, index = 0;
3065 ssize_t nb_dom = 0;
3066
3067 if (session->kernel_session != NULL) {
3068 DBG3("Listing domains found kernel domain");
3069 nb_dom++;
3070 }
3071
3072 if (session->ust_session != NULL) {
3073 DBG3("Listing domains found UST global domain");
3074 nb_dom++;
3075 }
3076
3077 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3078 if (*domains == NULL) {
3079 ret = -LTTCOMM_FATAL;
3080 goto error;
3081 }
3082
3083 if (session->kernel_session != NULL) {
3084 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3085 index++;
3086 }
3087
3088 if (session->ust_session != NULL) {
3089 (*domains)[index].type = LTTNG_DOMAIN_UST;
3090 index++;
3091 }
3092
3093 return nb_dom;
3094
3095 error:
3096 return ret;
3097 }
3098
3099 /*
3100 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3101 */
3102 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3103 struct lttng_channel **channels)
3104 {
3105 int ret;
3106 ssize_t nb_chan = 0;
3107
3108 switch (domain) {
3109 case LTTNG_DOMAIN_KERNEL:
3110 if (session->kernel_session != NULL) {
3111 nb_chan = session->kernel_session->channel_count;
3112 }
3113 DBG3("Number of kernel channels %zd", nb_chan);
3114 break;
3115 case LTTNG_DOMAIN_UST:
3116 if (session->ust_session != NULL) {
3117 nb_chan = lttng_ht_get_count(
3118 session->ust_session->domain_global.channels);
3119 }
3120 DBG3("Number of UST global channels %zd", nb_chan);
3121 break;
3122 default:
3123 *channels = NULL;
3124 ret = -LTTCOMM_UND;
3125 goto error;
3126 }
3127
3128 if (nb_chan > 0) {
3129 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3130 if (*channels == NULL) {
3131 ret = -LTTCOMM_FATAL;
3132 goto error;
3133 }
3134
3135 list_lttng_channels(domain, session, *channels);
3136 } else {
3137 *channels = NULL;
3138 }
3139
3140 return nb_chan;
3141
3142 error:
3143 return ret;
3144 }
3145
3146 /*
3147 * Command LTTNG_LIST_EVENTS processed by the client thread.
3148 */
3149 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3150 char *channel_name, struct lttng_event **events)
3151 {
3152 int ret = 0;
3153 ssize_t nb_event = 0;
3154
3155 switch (domain) {
3156 case LTTNG_DOMAIN_KERNEL:
3157 if (session->kernel_session != NULL) {
3158 nb_event = list_lttng_kernel_events(channel_name,
3159 session->kernel_session, events);
3160 }
3161 break;
3162 case LTTNG_DOMAIN_UST:
3163 {
3164 if (session->ust_session != NULL) {
3165 nb_event = list_lttng_ust_global_events(channel_name,
3166 &session->ust_session->domain_global, events);
3167 }
3168 break;
3169 }
3170 default:
3171 ret = -LTTCOMM_UND;
3172 goto error;
3173 }
3174
3175 ret = nb_event;
3176
3177 error:
3178 return ret;
3179 }
3180
3181 /*
3182 * Process the command requested by the lttng client within the command
3183 * context structure. This function make sure that the return structure (llm)
3184 * is set and ready for transmission before returning.
3185 *
3186 * Return any error encountered or 0 for success.
3187 */
3188 static int process_client_msg(struct command_ctx *cmd_ctx)
3189 {
3190 int ret = LTTCOMM_OK;
3191 int need_tracing_session = 1;
3192
3193 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3194
3195 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3196 ret = LTTCOMM_KERN_NA;
3197 goto error;
3198 }
3199
3200 /*
3201 * Check for command that don't needs to allocate a returned payload. We do
3202 * this here so we don't have to make the call for no payload at each
3203 * command.
3204 */
3205 switch(cmd_ctx->lsm->cmd_type) {
3206 case LTTNG_LIST_SESSIONS:
3207 case LTTNG_LIST_TRACEPOINTS:
3208 case LTTNG_LIST_DOMAINS:
3209 case LTTNG_LIST_CHANNELS:
3210 case LTTNG_LIST_EVENTS:
3211 break;
3212 default:
3213 /* Setup lttng message with no payload */
3214 ret = setup_lttng_msg(cmd_ctx, 0);
3215 if (ret < 0) {
3216 /* This label does not try to unlock the session */
3217 goto init_setup_error;
3218 }
3219 }
3220
3221 /* Commands that DO NOT need a session. */
3222 switch (cmd_ctx->lsm->cmd_type) {
3223 case LTTNG_CALIBRATE:
3224 case LTTNG_CREATE_SESSION:
3225 case LTTNG_LIST_SESSIONS:
3226 case LTTNG_LIST_TRACEPOINTS:
3227 need_tracing_session = 0;
3228 break;
3229 default:
3230 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3231 session_lock_list();
3232 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3233 session_unlock_list();
3234 if (cmd_ctx->session == NULL) {
3235 if (cmd_ctx->lsm->session.name != NULL) {
3236 ret = LTTCOMM_SESS_NOT_FOUND;
3237 } else {
3238 /* If no session name specified */
3239 ret = LTTCOMM_SELECT_SESS;
3240 }
3241 goto error;
3242 } else {
3243 /* Acquire lock for the session */
3244 session_lock(cmd_ctx->session);
3245 }
3246 break;
3247 }
3248
3249 /*
3250 * Check domain type for specific "pre-action".
3251 */
3252 switch (cmd_ctx->lsm->domain.type) {
3253 case LTTNG_DOMAIN_KERNEL:
3254 if (!is_root) {
3255 ret = LTTCOMM_KERN_NA;
3256 goto error;
3257 }
3258
3259 /* Kernel tracer check */
3260 if (kernel_tracer_fd == 0) {
3261 /* Basically, load kernel tracer modules */
3262 ret = init_kernel_tracer();
3263 if (ret != 0) {
3264 goto error;
3265 }
3266 }
3267
3268 /* Need a session for kernel command */
3269 if (need_tracing_session) {
3270 if (cmd_ctx->session->kernel_session == NULL) {
3271 ret = create_kernel_session(cmd_ctx->session);
3272 if (ret < 0) {
3273 ret = LTTCOMM_KERN_SESS_FAIL;
3274 goto error;
3275 }
3276 }
3277
3278 /* Start the kernel consumer daemon */
3279 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3280 if (kconsumer_data.pid == 0 &&
3281 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3282 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3283 ret = start_consumerd(&kconsumer_data);
3284 if (ret < 0) {
3285 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3286 goto error;
3287 }
3288 } else {
3289 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3290 }
3291 }
3292 break;
3293 case LTTNG_DOMAIN_UST:
3294 {
3295 if (need_tracing_session) {
3296 if (cmd_ctx->session->ust_session == NULL) {
3297 ret = create_ust_session(cmd_ctx->session,
3298 &cmd_ctx->lsm->domain);
3299 if (ret != LTTCOMM_OK) {
3300 goto error;
3301 }
3302 }
3303 /* Start the UST consumer daemons */
3304 /* 64-bit */
3305 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3306 if (consumerd64_bin[0] != '\0' &&
3307 ustconsumer64_data.pid == 0 &&
3308 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3309 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3310 ret = start_consumerd(&ustconsumer64_data);
3311 if (ret < 0) {
3312 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3313 ust_consumerd64_fd = -EINVAL;
3314 goto error;
3315 }
3316
3317 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3318 } else {
3319 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3320 }
3321 /* 32-bit */
3322 if (consumerd32_bin[0] != '\0' &&
3323 ustconsumer32_data.pid == 0 &&
3324 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3325 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3326 ret = start_consumerd(&ustconsumer32_data);
3327 if (ret < 0) {
3328 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3329 ust_consumerd32_fd = -EINVAL;
3330 goto error;
3331 }
3332 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3333 } else {
3334 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3335 }
3336 }
3337 break;
3338 }
3339 default:
3340 break;
3341 }
3342
3343 /*
3344 * Check that the UID or GID match that of the tracing session.
3345 * The root user can interact with all sessions.
3346 */
3347 if (need_tracing_session) {
3348 if (!session_access_ok(cmd_ctx->session,
3349 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3350 ret = LTTCOMM_EPERM;
3351 goto error;
3352 }
3353 }
3354
3355 /* Process by command type */
3356 switch (cmd_ctx->lsm->cmd_type) {
3357 case LTTNG_ADD_CONTEXT:
3358 {
3359 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3360 cmd_ctx->lsm->u.context.channel_name,
3361 cmd_ctx->lsm->u.context.event_name,
3362 &cmd_ctx->lsm->u.context.ctx);
3363 break;
3364 }
3365 case LTTNG_DISABLE_CHANNEL:
3366 {
3367 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3368 cmd_ctx->lsm->u.disable.channel_name);
3369 break;
3370 }
3371 case LTTNG_DISABLE_EVENT:
3372 {
3373 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3374 cmd_ctx->lsm->u.disable.channel_name,
3375 cmd_ctx->lsm->u.disable.name);
3376 break;
3377 }
3378 case LTTNG_DISABLE_ALL_EVENT:
3379 {
3380 DBG("Disabling all events");
3381
3382 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3383 cmd_ctx->lsm->u.disable.channel_name);
3384 break;
3385 }
3386 case LTTNG_ENABLE_CHANNEL:
3387 {
3388 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3389 &cmd_ctx->lsm->u.channel.chan);
3390 break;
3391 }
3392 case LTTNG_ENABLE_EVENT:
3393 {
3394 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3395 cmd_ctx->lsm->u.enable.channel_name,
3396 &cmd_ctx->lsm->u.enable.event);
3397 break;
3398 }
3399 case LTTNG_ENABLE_ALL_EVENT:
3400 {
3401 DBG("Enabling all events");
3402
3403 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3404 cmd_ctx->lsm->u.enable.channel_name,
3405 cmd_ctx->lsm->u.enable.event.type);
3406 break;
3407 }
3408 case LTTNG_LIST_TRACEPOINTS:
3409 {
3410 struct lttng_event *events;
3411 ssize_t nb_events;
3412
3413 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3414 if (nb_events < 0) {
3415 ret = -nb_events;
3416 goto error;
3417 }
3418
3419 /*
3420 * Setup lttng message with payload size set to the event list size in
3421 * bytes and then copy list into the llm payload.
3422 */
3423 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3424 if (ret < 0) {
3425 free(events);
3426 goto setup_error;
3427 }
3428
3429 /* Copy event list into message payload */
3430 memcpy(cmd_ctx->llm->payload, events,
3431 sizeof(struct lttng_event) * nb_events);
3432
3433 free(events);
3434
3435 ret = LTTCOMM_OK;
3436 break;
3437 }
3438 case LTTNG_START_TRACE:
3439 {
3440 ret = cmd_start_trace(cmd_ctx->session);
3441 break;
3442 }
3443 case LTTNG_STOP_TRACE:
3444 {
3445 ret = cmd_stop_trace(cmd_ctx->session);
3446 break;
3447 }
3448 case LTTNG_CREATE_SESSION:
3449 {
3450 tracepoint(create_session_start);
3451 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3452 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3453 tracepoint(create_session_end);
3454 break;
3455 }
3456 case LTTNG_DESTROY_SESSION:
3457 {
3458 tracepoint(destroy_session_start);
3459 ret = cmd_destroy_session(cmd_ctx->session,
3460 cmd_ctx->lsm->session.name);
3461 tracepoint(destroy_session_end);
3462 break;
3463 }
3464 case LTTNG_LIST_DOMAINS:
3465 {
3466 ssize_t nb_dom;
3467 struct lttng_domain *domains;
3468
3469 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3470 if (nb_dom < 0) {
3471 ret = -nb_dom;
3472 goto error;
3473 }
3474
3475 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3476 if (ret < 0) {
3477 goto setup_error;
3478 }
3479
3480 /* Copy event list into message payload */
3481 memcpy(cmd_ctx->llm->payload, domains,
3482 nb_dom * sizeof(struct lttng_domain));
3483
3484 free(domains);
3485
3486 ret = LTTCOMM_OK;
3487 break;
3488 }
3489 case LTTNG_LIST_CHANNELS:
3490 {
3491 size_t nb_chan;
3492 struct lttng_channel *channels;
3493
3494 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3495 cmd_ctx->session, &channels);
3496 if (nb_chan < 0) {
3497 ret = -nb_chan;
3498 goto error;
3499 }
3500
3501 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3502 if (ret < 0) {
3503 goto setup_error;
3504 }
3505
3506 /* Copy event list into message payload */
3507 memcpy(cmd_ctx->llm->payload, channels,
3508 nb_chan * sizeof(struct lttng_channel));
3509
3510 free(channels);
3511
3512 ret = LTTCOMM_OK;
3513 break;
3514 }
3515 case LTTNG_LIST_EVENTS:
3516 {
3517 ssize_t nb_event;
3518 struct lttng_event *events = NULL;
3519
3520 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3521 cmd_ctx->lsm->u.list.channel_name, &events);
3522 if (nb_event < 0) {
3523 ret = -nb_event;
3524 goto error;
3525 }
3526
3527 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3528 if (ret < 0) {
3529 goto setup_error;
3530 }
3531
3532 /* Copy event list into message payload */
3533 memcpy(cmd_ctx->llm->payload, events,
3534 nb_event * sizeof(struct lttng_event));
3535
3536 free(events);
3537
3538 ret = LTTCOMM_OK;
3539 break;
3540 }
3541 case LTTNG_LIST_SESSIONS:
3542 {
3543 unsigned int nr_sessions;
3544
3545 session_lock_list();
3546 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3547
3548 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3549 if (ret < 0) {
3550 session_unlock_list();
3551 goto setup_error;
3552 }
3553
3554 /* Filled the session array */
3555 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3556 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3557
3558 session_unlock_list();
3559
3560 ret = LTTCOMM_OK;
3561 break;
3562 }
3563 case LTTNG_CALIBRATE:
3564 {
3565 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3566 &cmd_ctx->lsm->u.calibrate);
3567 break;
3568 }
3569 case LTTNG_REGISTER_CONSUMER:
3570 {
3571 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3572 cmd_ctx->lsm->u.reg.path);
3573 break;
3574 }
3575 default:
3576 ret = LTTCOMM_UND;
3577 break;
3578 }
3579
3580 error:
3581 if (cmd_ctx->llm == NULL) {
3582 DBG("Missing llm structure. Allocating one.");
3583 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3584 goto setup_error;
3585 }
3586 }
3587 /* Set return code */
3588 cmd_ctx->llm->ret_code = ret;
3589 setup_error:
3590 if (cmd_ctx->session) {
3591 session_unlock(cmd_ctx->session);
3592 }
3593 init_setup_error:
3594 return ret;
3595 }
3596
3597 /*
3598 * This thread manage all clients request using the unix client socket for
3599 * communication.
3600 */
3601 static void *thread_manage_clients(void *data)
3602 {
3603 int sock = 0, ret, i, pollfd;
3604 uint32_t revents, nb_fd;
3605 struct command_ctx *cmd_ctx = NULL;
3606 struct lttng_poll_event events;
3607
3608 tracepoint(sessiond_th_cli_start);
3609
3610 DBG("[thread] Manage client started");
3611
3612 rcu_register_thread();
3613
3614 ret = lttcomm_listen_unix_sock(client_sock);
3615 if (ret < 0) {
3616 goto error;
3617 }
3618
3619 /*
3620 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3621 * more will be added to this poll set.
3622 */
3623 ret = create_thread_poll_set(&events, 2);
3624 if (ret < 0) {
3625 goto error;
3626 }
3627
3628 /* Add the application registration socket */
3629 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3630 if (ret < 0) {
3631 goto error;
3632 }
3633
3634 /*
3635 * Notify parent pid that we are ready to accept command for client side.
3636 */
3637 if (opt_sig_parent) {
3638 kill(ppid, SIGUSR1);
3639 }
3640
3641 while (1) {
3642 DBG("Accepting client command ...");
3643
3644 tracepoint(sessiond_th_cli_poll);
3645
3646 nb_fd = LTTNG_POLL_GETNB(&events);
3647
3648 /* Inifinite blocking call, waiting for transmission */
3649 ret = lttng_poll_wait(&events, -1);
3650 if (ret < 0) {
3651 goto error;
3652 }
3653
3654 for (i = 0; i < nb_fd; i++) {
3655 /* Fetch once the poll data */
3656 revents = LTTNG_POLL_GETEV(&events, i);
3657 pollfd = LTTNG_POLL_GETFD(&events, i);
3658
3659 /* Thread quit pipe has been closed. Killing thread. */
3660 ret = check_thread_quit_pipe(pollfd, revents);
3661 if (ret) {
3662 goto error;
3663 }
3664
3665 /* Event on the registration socket */
3666 if (pollfd == client_sock) {
3667 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3668 ERR("Client socket poll error");
3669 goto error;
3670 }
3671 }
3672 }
3673
3674 DBG("Wait for client response");
3675
3676 sock = lttcomm_accept_unix_sock(client_sock);
3677 if (sock < 0) {
3678 goto error;
3679 }
3680
3681 /* Set socket option for credentials retrieval */
3682 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3683 if (ret < 0) {
3684 goto error;
3685 }
3686
3687 /* Allocate context command to process the client request */
3688 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3689 if (cmd_ctx == NULL) {
3690 perror("zmalloc cmd_ctx");
3691 goto error;
3692 }
3693
3694 /* Allocate data buffer for reception */
3695 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3696 if (cmd_ctx->lsm == NULL) {
3697 perror("zmalloc cmd_ctx->lsm");
3698 goto error;
3699 }
3700
3701 cmd_ctx->llm = NULL;
3702 cmd_ctx->session = NULL;
3703
3704 /*
3705 * Data is received from the lttng client. The struct
3706 * lttcomm_session_msg (lsm) contains the command and data request of
3707 * the client.
3708 */
3709 DBG("Receiving data from client ...");
3710 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3711 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3712 if (ret <= 0) {
3713 DBG("Nothing recv() from client... continuing");
3714 close(sock);
3715 free(cmd_ctx);
3716 continue;
3717 }
3718
3719 // TODO: Validate cmd_ctx including sanity check for
3720 // security purpose.
3721
3722 rcu_thread_online();
3723 /*
3724 * This function dispatch the work to the kernel or userspace tracer
3725 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3726 * informations for the client. The command context struct contains
3727 * everything this function may needs.
3728 */
3729 ret = process_client_msg(cmd_ctx);
3730 rcu_thread_offline();
3731 if (ret < 0) {
3732 /*
3733 * TODO: Inform client somehow of the fatal error. At
3734 * this point, ret < 0 means that a zmalloc failed
3735 * (ENOMEM). Error detected but still accept command.
3736 */
3737 clean_command_ctx(&cmd_ctx);
3738 continue;
3739 }
3740
3741 DBG("Sending response (size: %d, retcode: %s)",
3742 cmd_ctx->lttng_msg_size,
3743 lttng_strerror(-cmd_ctx->llm->ret_code));
3744 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3745 if (ret < 0) {
3746 ERR("Failed to send data back to client");
3747 }
3748
3749 /* End of transmission */
3750 close(sock);
3751
3752 clean_command_ctx(&cmd_ctx);
3753 }
3754
3755 error:
3756 DBG("Client thread dying");
3757 unlink(client_unix_sock_path);
3758 close(client_sock);
3759 close(sock);
3760
3761 lttng_poll_clean(&events);
3762 clean_command_ctx(&cmd_ctx);
3763
3764 rcu_unregister_thread();
3765 return NULL;
3766 }
3767
3768
3769 /*
3770 * usage function on stderr
3771 */
3772 static void usage(void)
3773 {
3774 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3775 fprintf(stderr, " -h, --help Display this usage.\n");
3776 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3777 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3778 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3779 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3780 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3781 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3782 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3783 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3784 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3785 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3786 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3787 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3788 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3789 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3790 fprintf(stderr, " -V, --version Show version number.\n");
3791 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3792 fprintf(stderr, " -q, --quiet No output at all.\n");
3793 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3794 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3795 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3796 }
3797
3798 /*
3799 * daemon argument parsing
3800 */
3801 static int parse_args(int argc, char **argv)
3802 {
3803 int c;
3804
3805 static struct option long_options[] = {
3806 { "client-sock", 1, 0, 'c' },
3807 { "apps-sock", 1, 0, 'a' },
3808 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3809 { "kconsumerd-err-sock", 1, 0, 'E' },
3810 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3811 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3812 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3813 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3814 { "consumerd32-path", 1, 0, 'u' },
3815 { "consumerd32-libdir", 1, 0, 'U' },
3816 { "consumerd64-path", 1, 0, 't' },
3817 { "consumerd64-libdir", 1, 0, 'T' },
3818 { "daemonize", 0, 0, 'd' },
3819 { "sig-parent", 0, 0, 'S' },
3820 { "help", 0, 0, 'h' },
3821 { "group", 1, 0, 'g' },
3822 { "version", 0, 0, 'V' },
3823 { "quiet", 0, 0, 'q' },
3824 { "verbose", 0, 0, 'v' },
3825 { "verbose-consumer", 0, 0, 'Z' },
3826 { "no-kernel", 0, 0, 'N' },
3827 { NULL, 0, 0, 0 }
3828 };
3829
3830 while (1) {
3831 int option_index = 0;
3832 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3833 long_options, &option_index);
3834 if (c == -1) {
3835 break;
3836 }
3837
3838 switch (c) {
3839 case 0:
3840 fprintf(stderr, "option %s", long_options[option_index].name);
3841 if (optarg) {
3842 fprintf(stderr, " with arg %s\n", optarg);
3843 }
3844 break;
3845 case 'c':
3846 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3847 break;
3848 case 'a':
3849 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3850 break;
3851 case 'd':
3852 opt_daemon = 1;
3853 break;
3854 case 'g':
3855 opt_tracing_group = optarg;
3856 break;
3857 case 'h':
3858 usage();
3859 exit(EXIT_FAILURE);
3860 case 'V':
3861 fprintf(stdout, "%s\n", VERSION);
3862 exit(EXIT_SUCCESS);
3863 case 'S':
3864 opt_sig_parent = 1;
3865 break;
3866 case 'E':
3867 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3868 break;
3869 case 'C':
3870 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3871 break;
3872 case 'F':
3873 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3874 break;
3875 case 'D':
3876 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3877 break;
3878 case 'H':
3879 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3880 break;
3881 case 'G':
3882 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3883 break;
3884 case 'N':
3885 opt_no_kernel = 1;
3886 break;
3887 case 'q':
3888 opt_quiet = 1;
3889 break;
3890 case 'v':
3891 /* Verbose level can increase using multiple -v */
3892 opt_verbose += 1;
3893 break;
3894 case 'Z':
3895 opt_verbose_consumer += 1;
3896 break;
3897 case 'u':
3898 consumerd32_bin= optarg;
3899 break;
3900 case 'U':
3901 consumerd32_libdir = optarg;
3902 break;
3903 case 't':
3904 consumerd64_bin = optarg;
3905 break;
3906 case 'T':
3907 consumerd64_libdir = optarg;
3908 break;
3909 default:
3910 /* Unknown option or other error.
3911 * Error is printed by getopt, just return */
3912 return -1;
3913 }
3914 }
3915
3916 return 0;
3917 }
3918
3919 /*
3920 * Creates the two needed socket by the daemon.
3921 * apps_sock - The communication socket for all UST apps.
3922 * client_sock - The communication of the cli tool (lttng).
3923 */
3924 static int init_daemon_socket(void)
3925 {
3926 int ret = 0;
3927 mode_t old_umask;
3928
3929 old_umask = umask(0);
3930
3931 /* Create client tool unix socket */
3932 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3933 if (client_sock < 0) {
3934 ERR("Create unix sock failed: %s", client_unix_sock_path);
3935 ret = -1;
3936 goto end;
3937 }
3938
3939 /* File permission MUST be 660 */
3940 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3941 if (ret < 0) {
3942 ERR("Set file permissions failed: %s", client_unix_sock_path);
3943 perror("chmod");
3944 goto end;
3945 }
3946
3947 /* Create the application unix socket */
3948 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3949 if (apps_sock < 0) {
3950 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3951 ret = -1;
3952 goto end;
3953 }
3954
3955 /* File permission MUST be 666 */
3956 ret = chmod(apps_unix_sock_path,
3957 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3958 if (ret < 0) {
3959 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3960 perror("chmod");
3961 goto end;
3962 }
3963
3964 end:
3965 umask(old_umask);
3966 return ret;
3967 }
3968
3969 /*
3970 * Check if the global socket is available, and if a daemon is answering at the
3971 * other side. If yes, error is returned.
3972 */
3973 static int check_existing_daemon(void)
3974 {
3975 /* Is there anybody out there ? */
3976 if (lttng_session_daemon_alive()) {
3977 return -EEXIST;
3978 }
3979
3980 return 0;
3981 }
3982
3983 /*
3984 * Set the tracing group gid onto the client socket.
3985 *
3986 * Race window between mkdir and chown is OK because we are going from more
3987 * permissive (root.root) to less permissive (root.tracing).
3988 */
3989 static int set_permissions(char *rundir)
3990 {
3991 int ret;
3992 gid_t gid;
3993
3994 gid = allowed_group();
3995 if (gid < 0) {
3996 WARN("No tracing group detected");
3997 ret = 0;
3998 goto end;
3999 }
4000
4001 /* Set lttng run dir */
4002 ret = chown(rundir, 0, gid);
4003 if (ret < 0) {
4004 ERR("Unable to set group on %s", rundir);
4005 perror("chown");
4006 }
4007
4008 /* Ensure tracing group can search the run dir */
4009 ret = chmod(rundir, S_IRWXU | S_IXGRP);
4010 if (ret < 0) {
4011 ERR("Unable to set permissions on %s", rundir);
4012 perror("chmod");
4013 }
4014
4015 /* lttng client socket path */
4016 ret = chown(client_unix_sock_path, 0, gid);
4017 if (ret < 0) {
4018 ERR("Unable to set group on %s", client_unix_sock_path);
4019 perror("chown");
4020 }
4021
4022 /* kconsumer error socket path */
4023 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4024 if (ret < 0) {
4025 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4026 perror("chown");
4027 }
4028
4029 /* 64-bit ustconsumer error socket path */
4030 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4031 if (ret < 0) {
4032 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4033 perror("chown");
4034 }
4035
4036 /* 32-bit ustconsumer compat32 error socket path */
4037 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4038 if (ret < 0) {
4039 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4040 perror("chown");
4041 }
4042
4043 DBG("All permissions are set");
4044
4045 end:
4046 return ret;
4047 }
4048
4049 /*
4050 * Create the pipe used to wake up the kernel thread.
4051 */
4052 static int create_kernel_poll_pipe(void)
4053 {
4054 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4055 }
4056
4057 /*
4058 * Create the application command pipe to wake thread_manage_apps.
4059 */
4060 static int create_apps_cmd_pipe(void)
4061 {
4062 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4063 }
4064
4065 /*
4066 * Create the lttng run directory needed for all global sockets and pipe.
4067 */
4068 static int create_lttng_rundir(const char *rundir)
4069 {
4070 int ret;
4071
4072 DBG3("Creating LTTng run directory: %s", rundir);
4073
4074 ret = mkdir(rundir, S_IRWXU);
4075 if (ret < 0) {
4076 if (errno != EEXIST) {
4077 ERR("Unable to create %s", rundir);
4078 goto error;
4079 } else {
4080 ret = 0;
4081 }
4082 }
4083
4084 error:
4085 return ret;
4086 }
4087
4088 /*
4089 * Setup sockets and directory needed by the kconsumerd communication with the
4090 * session daemon.
4091 */
4092 static int set_consumer_sockets(struct consumer_data *consumer_data,
4093 const char *rundir)
4094 {
4095 int ret;
4096 char path[PATH_MAX];
4097
4098 switch (consumer_data->type) {
4099 case LTTNG_CONSUMER_KERNEL:
4100 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4101 break;
4102 case LTTNG_CONSUMER64_UST:
4103 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4104 break;
4105 case LTTNG_CONSUMER32_UST:
4106 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4107 break;
4108 default:
4109 ERR("Consumer type unknown");
4110 ret = -EINVAL;
4111 goto error;
4112 }
4113
4114 DBG2("Creating consumer directory: %s", path);
4115
4116 ret = mkdir(path, S_IRWXU);
4117 if (ret < 0) {
4118 if (errno != EEXIST) {
4119 ERR("Failed to create %s", path);
4120 goto error;
4121 }
4122 ret = 0;
4123 }
4124
4125 /* Create the kconsumerd error unix socket */
4126 consumer_data->err_sock =
4127 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4128 if (consumer_data->err_sock < 0) {
4129 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4130 ret = -1;
4131 goto error;
4132 }
4133
4134 /* File permission MUST be 660 */
4135 ret = chmod(consumer_data->err_unix_sock_path,
4136 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4137 if (ret < 0) {
4138 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4139 PERROR("chmod");
4140 goto error;
4141 }
4142
4143 error:
4144 return ret;
4145 }
4146
4147 /*
4148 * Signal handler for the daemon
4149 *
4150 * Simply stop all worker threads, leaving main() return gracefully after
4151 * joining all threads and calling cleanup().
4152 */
4153 static void sighandler(int sig)
4154 {
4155 switch (sig) {
4156 case SIGPIPE:
4157 DBG("SIGPIPE caught");
4158 return;
4159 case SIGINT:
4160 DBG("SIGINT caught");
4161 stop_threads();
4162 break;
4163 case SIGTERM:
4164 DBG("SIGTERM caught");
4165 stop_threads();
4166 break;
4167 default:
4168 break;
4169 }
4170 }
4171
4172 /*
4173 * Setup signal handler for :
4174 * SIGINT, SIGTERM, SIGPIPE
4175 */
4176 static int set_signal_handler(void)
4177 {
4178 int ret = 0;
4179 struct sigaction sa;
4180 sigset_t sigset;
4181
4182 if ((ret = sigemptyset(&sigset)) < 0) {
4183 perror("sigemptyset");
4184 return ret;
4185 }
4186
4187 sa.sa_handler = sighandler;
4188 sa.sa_mask = sigset;
4189 sa.sa_flags = 0;
4190 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4191 perror("sigaction");
4192 return ret;
4193 }
4194
4195 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4196 perror("sigaction");
4197 return ret;
4198 }
4199
4200 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4201 perror("sigaction");
4202 return ret;
4203 }
4204
4205 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4206
4207 return ret;
4208 }
4209
4210 /*
4211 * Set open files limit to unlimited. This daemon can open a large number of
4212 * file descriptors in order to consumer multiple kernel traces.
4213 */
4214 static void set_ulimit(void)
4215 {
4216 int ret;
4217 struct rlimit lim;
4218
4219 /* The kernel does not allowed an infinite limit for open files */
4220 lim.rlim_cur = 65535;
4221 lim.rlim_max = 65535;
4222
4223 ret = setrlimit(RLIMIT_NOFILE, &lim);
4224 if (ret < 0) {
4225 perror("failed to set open files limit");
4226 }
4227 }
4228
4229 /*
4230 * main
4231 */
4232 int main(int argc, char **argv)
4233 {
4234 int ret = 0;
4235 void *status;
4236 const char *home_path;
4237
4238 tracepoint(sessiond_boot_start);
4239
4240 init_kernel_workarounds();
4241
4242 rcu_register_thread();
4243
4244 /* Create thread quit pipe */
4245 if ((ret = init_thread_quit_pipe()) < 0) {
4246 goto error;
4247 }
4248
4249 setup_consumerd_path();
4250
4251 /* Parse arguments */
4252 progname = argv[0];
4253 if ((ret = parse_args(argc, argv) < 0)) {
4254 goto error;
4255 }
4256
4257 /* Daemonize */
4258 if (opt_daemon) {
4259 ret = daemon(0, 0);
4260 if (ret < 0) {
4261 perror("daemon");
4262 goto error;
4263 }
4264 }
4265
4266 /* Check if daemon is UID = 0 */
4267 is_root = !getuid();
4268
4269 if (is_root) {
4270 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4271
4272 /* Create global run dir with root access */
4273 ret = create_lttng_rundir(rundir);
4274 if (ret < 0) {
4275 goto error;
4276 }
4277
4278 if (strlen(apps_unix_sock_path) == 0) {
4279 snprintf(apps_unix_sock_path, PATH_MAX,
4280 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4281 }
4282
4283 if (strlen(client_unix_sock_path) == 0) {
4284 snprintf(client_unix_sock_path, PATH_MAX,
4285 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4286 }
4287
4288 /* Set global SHM for ust */
4289 if (strlen(wait_shm_path) == 0) {
4290 snprintf(wait_shm_path, PATH_MAX,
4291 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4292 }
4293
4294 /* Setup kernel consumerd path */
4295 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4296 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4297 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4298 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4299
4300 DBG2("Kernel consumer err path: %s",
4301 kconsumer_data.err_unix_sock_path);
4302 DBG2("Kernel consumer cmd path: %s",
4303 kconsumer_data.cmd_unix_sock_path);
4304 } else {
4305 home_path = get_home_dir();
4306 if (home_path == NULL) {
4307 /* TODO: Add --socket PATH option */
4308 ERR("Can't get HOME directory for sockets creation.");
4309 ret = -EPERM;
4310 goto error;
4311 }
4312
4313 /*
4314 * Create rundir from home path. This will create something like
4315 * $HOME/.lttng
4316 */
4317 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4318 if (ret < 0) {
4319 ret = -ENOMEM;
4320 goto error;
4321 }
4322
4323 ret = create_lttng_rundir(rundir);
4324 if (ret < 0) {
4325 goto error;
4326 }
4327
4328 if (strlen(apps_unix_sock_path) == 0) {
4329 snprintf(apps_unix_sock_path, PATH_MAX,
4330 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4331 }
4332
4333 /* Set the cli tool unix socket path */
4334 if (strlen(client_unix_sock_path) == 0) {
4335 snprintf(client_unix_sock_path, PATH_MAX,
4336 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4337 }
4338
4339 /* Set global SHM for ust */
4340 if (strlen(wait_shm_path) == 0) {
4341 snprintf(wait_shm_path, PATH_MAX,
4342 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4343 }
4344 }
4345
4346 DBG("Client socket path %s", client_unix_sock_path);
4347 DBG("Application socket path %s", apps_unix_sock_path);
4348 DBG("LTTng run directory path: %s", rundir);
4349
4350 /* 32 bits consumerd path setup */
4351 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4352 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4353 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4354 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4355
4356 DBG2("UST consumer 32 bits err path: %s",
4357 ustconsumer32_data.err_unix_sock_path);
4358 DBG2("UST consumer 32 bits cmd path: %s",
4359 ustconsumer32_data.cmd_unix_sock_path);
4360
4361 /* 64 bits consumerd path setup */
4362 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4363 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4364 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4365 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4366
4367 DBG2("UST consumer 64 bits err path: %s",
4368 ustconsumer64_data.err_unix_sock_path);
4369 DBG2("UST consumer 64 bits cmd path: %s",
4370 ustconsumer64_data.cmd_unix_sock_path);
4371
4372 /*
4373 * See if daemon already exist.
4374 */
4375 if ((ret = check_existing_daemon()) < 0) {
4376 ERR("Already running daemon.\n");
4377 /*
4378 * We do not goto exit because we must not cleanup()
4379 * because a daemon is already running.
4380 */
4381 goto error;
4382 }
4383
4384 /* After this point, we can safely call cleanup() with "goto exit" */
4385
4386 /*
4387 * These actions must be executed as root. We do that *after* setting up
4388 * the sockets path because we MUST make the check for another daemon using
4389 * those paths *before* trying to set the kernel consumer sockets and init
4390 * kernel tracer.
4391 */
4392 if (is_root) {
4393 ret = set_consumer_sockets(&kconsumer_data, rundir);
4394 if (ret < 0) {
4395 goto exit;
4396 }
4397
4398 /* Setup kernel tracer */
4399 if (!opt_no_kernel) {
4400 init_kernel_tracer();
4401 }
4402
4403 /* Set ulimit for open files */
4404 set_ulimit();
4405 }
4406
4407 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4408 if (ret < 0) {
4409 goto exit;
4410 }
4411
4412 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4413 if (ret < 0) {
4414 goto exit;
4415 }
4416
4417 if ((ret = set_signal_handler()) < 0) {
4418 goto exit;
4419 }
4420
4421 /* Setup the needed unix socket */
4422 if ((ret = init_daemon_socket()) < 0) {
4423 goto exit;
4424 }
4425
4426 /* Set credentials to socket */
4427 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4428 goto exit;
4429 }
4430
4431 /* Get parent pid if -S, --sig-parent is specified. */
4432 if (opt_sig_parent) {
4433 ppid = getppid();
4434 }
4435
4436 /* Setup the kernel pipe for waking up the kernel thread */
4437 if ((ret = create_kernel_poll_pipe()) < 0) {
4438 goto exit;
4439 }
4440
4441 /* Setup the thread apps communication pipe. */
4442 if ((ret = create_apps_cmd_pipe()) < 0) {
4443 goto exit;
4444 }
4445
4446 /* Init UST command queue. */
4447 cds_wfq_init(&ust_cmd_queue.queue);
4448
4449 /* Init UST app hash table */
4450 ust_app_ht_alloc();
4451
4452 /*
4453 * Get session list pointer. This pointer MUST NOT be free(). This list is
4454 * statically declared in session.c
4455 */
4456 session_list_ptr = session_get_list();
4457
4458 /* Set up max poll set size */
4459 lttng_poll_set_max_size();
4460
4461 /* Create thread to manage the client socket */
4462 ret = pthread_create(&client_thread, NULL,
4463 thread_manage_clients, (void *) NULL);
4464 if (ret != 0) {
4465 perror("pthread_create clients");
4466 goto exit_client;
4467 }
4468
4469 /* Create thread to dispatch registration */
4470 ret = pthread_create(&dispatch_thread, NULL,
4471 thread_dispatch_ust_registration, (void *) NULL);
4472 if (ret != 0) {
4473 perror("pthread_create dispatch");
4474 goto exit_dispatch;
4475 }
4476
4477 /* Create thread to manage application registration. */
4478 ret = pthread_create(&reg_apps_thread, NULL,
4479 thread_registration_apps, (void *) NULL);
4480 if (ret != 0) {
4481 perror("pthread_create registration");
4482 goto exit_reg_apps;
4483 }
4484
4485 /* Create thread to manage application socket */
4486 ret = pthread_create(&apps_thread, NULL,
4487 thread_manage_apps, (void *) NULL);
4488 if (ret != 0) {
4489 perror("pthread_create apps");
4490 goto exit_apps;
4491 }
4492
4493 /* Create kernel thread to manage kernel event */
4494 ret = pthread_create(&kernel_thread, NULL,
4495 thread_manage_kernel, (void *) NULL);
4496 if (ret != 0) {
4497 perror("pthread_create kernel");
4498 goto exit_kernel;
4499 }
4500
4501 tracepoint(sessiond_boot_end);
4502
4503 ret = pthread_join(kernel_thread, &status);
4504 if (ret != 0) {
4505 perror("pthread_join");
4506 goto error; /* join error, exit without cleanup */
4507 }
4508
4509 exit_kernel:
4510 ret = pthread_join(apps_thread, &status);
4511 if (ret != 0) {
4512 perror("pthread_join");
4513 goto error; /* join error, exit without cleanup */
4514 }
4515
4516 exit_apps:
4517 ret = pthread_join(reg_apps_thread, &status);
4518 if (ret != 0) {
4519 perror("pthread_join");
4520 goto error; /* join error, exit without cleanup */
4521 }
4522
4523 exit_reg_apps:
4524 ret = pthread_join(dispatch_thread, &status);
4525 if (ret != 0) {
4526 perror("pthread_join");
4527 goto error; /* join error, exit without cleanup */
4528 }
4529
4530 exit_dispatch:
4531 ret = pthread_join(client_thread, &status);
4532 if (ret != 0) {
4533 perror("pthread_join");
4534 goto error; /* join error, exit without cleanup */
4535 }
4536
4537 ret = join_consumer_thread(&kconsumer_data);
4538 if (ret != 0) {
4539 perror("join_consumer");
4540 goto error; /* join error, exit without cleanup */
4541 }
4542
4543 exit_client:
4544 exit:
4545 /*
4546 * cleanup() is called when no other thread is running.
4547 */
4548 rcu_thread_online();
4549 cleanup();
4550 rcu_thread_offline();
4551 rcu_unregister_thread();
4552 if (!ret) {
4553 exit(EXIT_SUCCESS);
4554 }
4555 error:
4556 exit(EXIT_FAILURE);
4557 }
LTTng 2.0 tools and control repository
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