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