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Fix benchmark and missing tracepoint
[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 /* See shm.c for this call implying mmap, shm and futex calls */
634 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
635 if (wait_shm_mmap == NULL) {
636 goto error;
637 }
638
639 tracepoint(ust_notify_apps_start);
640
641 /* Wake waiting process */
642 futex_wait_update((int32_t *) wait_shm_mmap, active);
643
644 tracepoint(ust_notify_apps_stop);
645
646 /* Apps notified successfully */
647 return 0;
648
649 error:
650 return -1;
651 }
652
653 /*
654 * Setup the outgoing data buffer for the response (llm) by allocating the
655 * right amount of memory and copying the original information from the lsm
656 * structure.
657 *
658 * Return total size of the buffer pointed by buf.
659 */
660 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
661 {
662 int ret, buf_size;
663
664 buf_size = size;
665
666 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
667 if (cmd_ctx->llm == NULL) {
668 perror("zmalloc");
669 ret = -ENOMEM;
670 goto error;
671 }
672
673 /* Copy common data */
674 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
675 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
676
677 cmd_ctx->llm->data_size = size;
678 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
679
680 return buf_size;
681
682 error:
683 return ret;
684 }
685
686 /*
687 * Update the kernel poll set of all channel fd available over all tracing
688 * session. Add the wakeup pipe at the end of the set.
689 */
690 static int update_kernel_poll(struct lttng_poll_event *events)
691 {
692 int ret;
693 struct ltt_session *session;
694 struct ltt_kernel_channel *channel;
695
696 DBG("Updating kernel poll set");
697
698 session_lock_list();
699 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
700 session_lock(session);
701 if (session->kernel_session == NULL) {
702 session_unlock(session);
703 continue;
704 }
705
706 cds_list_for_each_entry(channel,
707 &session->kernel_session->channel_list.head, list) {
708 /* Add channel fd to the kernel poll set */
709 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
710 if (ret < 0) {
711 session_unlock(session);
712 goto error;
713 }
714 DBG("Channel fd %d added to kernel set", channel->fd);
715 }
716 session_unlock(session);
717 }
718 session_unlock_list();
719
720 return 0;
721
722 error:
723 session_unlock_list();
724 return -1;
725 }
726
727 /*
728 * Find the channel fd from 'fd' over all tracing session. When found, check
729 * for new channel stream and send those stream fds to the kernel consumer.
730 *
731 * Useful for CPU hotplug feature.
732 */
733 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
734 {
735 int ret = 0;
736 struct ltt_session *session;
737 struct ltt_kernel_channel *channel;
738
739 DBG("Updating kernel streams for channel fd %d", fd);
740
741 session_lock_list();
742 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
743 session_lock(session);
744 if (session->kernel_session == NULL) {
745 session_unlock(session);
746 continue;
747 }
748
749 /* This is not suppose to be 0 but this is an extra security check */
750 if (session->kernel_session->consumer_fd == 0) {
751 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
752 }
753
754 cds_list_for_each_entry(channel,
755 &session->kernel_session->channel_list.head, list) {
756 if (channel->fd == fd) {
757 DBG("Channel found, updating kernel streams");
758 ret = kernel_open_channel_stream(channel);
759 if (ret < 0) {
760 goto error;
761 }
762
763 /*
764 * Have we already sent fds to the consumer? If yes, it means
765 * that tracing is started so it is safe to send our updated
766 * stream fds.
767 */
768 if (session->kernel_session->consumer_fds_sent == 1) {
769 ret = send_kconsumer_channel_streams(consumer_data,
770 session->kernel_session->consumer_fd, channel,
771 session->uid, session->gid);
772 if (ret < 0) {
773 goto error;
774 }
775 }
776 goto error;
777 }
778 }
779 session_unlock(session);
780 }
781 session_unlock_list();
782 return ret;
783
784 error:
785 session_unlock(session);
786 session_unlock_list();
787 return ret;
788 }
789
790 /*
791 * For each tracing session, update newly registered apps.
792 */
793 static void update_ust_app(int app_sock)
794 {
795 struct ltt_session *sess, *stmp;
796
797 session_lock_list();
798
799 /* For all tracing session(s) */
800 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
801 session_lock(sess);
802 if (sess->ust_session) {
803 ust_app_global_update(sess->ust_session, app_sock);
804 }
805 session_unlock(sess);
806 }
807
808 session_unlock_list();
809 }
810
811 /*
812 * This thread manage event coming from the kernel.
813 *
814 * Features supported in this thread:
815 * -) CPU Hotplug
816 */
817 static void *thread_manage_kernel(void *data)
818 {
819 int ret, i, pollfd, update_poll_flag = 1;
820 uint32_t revents, nb_fd;
821 char tmp;
822 struct lttng_poll_event events;
823
824 tracepoint(sessiond_th_kern_start);
825
826 DBG("Thread manage kernel started");
827
828 ret = create_thread_poll_set(&events, 2);
829 if (ret < 0) {
830 goto error;
831 }
832
833 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
834 if (ret < 0) {
835 goto error;
836 }
837
838 while (1) {
839 if (update_poll_flag == 1) {
840 /*
841 * Reset number of fd in the poll set. Always 2 since there is the thread
842 * quit pipe and the kernel pipe.
843 */
844 events.nb_fd = 2;
845
846 ret = update_kernel_poll(&events);
847 if (ret < 0) {
848 goto error;
849 }
850 update_poll_flag = 0;
851 }
852
853 nb_fd = LTTNG_POLL_GETNB(&events);
854
855 DBG("Thread kernel polling on %d fds", nb_fd);
856
857 /* Zeroed the poll events */
858 lttng_poll_reset(&events);
859
860 tracepoint(sessiond_th_kern_poll);
861
862 /* Poll infinite value of time */
863 restart:
864 ret = lttng_poll_wait(&events, -1);
865 if (ret < 0) {
866 /*
867 * Restart interrupted system call.
868 */
869 if (errno == EINTR) {
870 goto restart;
871 }
872 goto error;
873 } else if (ret == 0) {
874 /* Should not happen since timeout is infinite */
875 ERR("Return value of poll is 0 with an infinite timeout.\n"
876 "This should not have happened! Continuing...");
877 continue;
878 }
879
880 for (i = 0; i < nb_fd; i++) {
881 /* Fetch once the poll data */
882 revents = LTTNG_POLL_GETEV(&events, i);
883 pollfd = LTTNG_POLL_GETFD(&events, i);
884
885 /* Thread quit pipe has been closed. Killing thread. */
886 ret = check_thread_quit_pipe(pollfd, revents);
887 if (ret) {
888 goto error;
889 }
890
891 /* Check for data on kernel pipe */
892 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
893 ret = read(kernel_poll_pipe[0], &tmp, 1);
894 update_poll_flag = 1;
895 continue;
896 } else {
897 /*
898 * New CPU detected by the kernel. Adding kernel stream to
899 * kernel session and updating the kernel consumer
900 */
901 if (revents & LPOLLIN) {
902 ret = update_kernel_stream(&kconsumer_data, pollfd);
903 if (ret < 0) {
904 continue;
905 }
906 break;
907 /*
908 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
909 * and unregister kernel stream at this point.
910 */
911 }
912 }
913 }
914 }
915
916 error:
917 DBG("Kernel thread dying");
918 close(kernel_poll_pipe[0]);
919 close(kernel_poll_pipe[1]);
920
921 lttng_poll_clean(&events);
922
923 return NULL;
924 }
925
926 /*
927 * This thread manage the consumer error sent back to the session daemon.
928 */
929 static void *thread_manage_consumer(void *data)
930 {
931 int sock = 0, i, ret, pollfd;
932 uint32_t revents, nb_fd;
933 enum lttcomm_return_code code;
934 struct lttng_poll_event events;
935 struct consumer_data *consumer_data = data;
936
937 tracepoint(sessiond_th_kcon_start);
938
939 DBG("[thread] Manage consumer started");
940
941 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
942 if (ret < 0) {
943 goto error;
944 }
945
946 /*
947 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
948 * Nothing more will be added to this poll set.
949 */
950 ret = create_thread_poll_set(&events, 2);
951 if (ret < 0) {
952 goto error;
953 }
954
955 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
956 if (ret < 0) {
957 goto error;
958 }
959
960 nb_fd = LTTNG_POLL_GETNB(&events);
961
962 tracepoint(sessiond_th_kcon_poll);
963
964 /* Inifinite blocking call, waiting for transmission */
965 restart:
966 ret = lttng_poll_wait(&events, -1);
967 if (ret < 0) {
968 /*
969 * Restart interrupted system call.
970 */
971 if (errno == EINTR) {
972 goto restart;
973 }
974 goto error;
975 }
976
977 for (i = 0; i < nb_fd; i++) {
978 /* Fetch once the poll data */
979 revents = LTTNG_POLL_GETEV(&events, i);
980 pollfd = LTTNG_POLL_GETFD(&events, i);
981
982 /* Thread quit pipe has been closed. Killing thread. */
983 ret = check_thread_quit_pipe(pollfd, revents);
984 if (ret) {
985 goto error;
986 }
987
988 /* Event on the registration socket */
989 if (pollfd == consumer_data->err_sock) {
990 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
991 ERR("consumer err socket poll error");
992 goto error;
993 }
994 }
995 }
996
997 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
998 if (sock < 0) {
999 goto error;
1000 }
1001
1002 DBG2("Receiving code from consumer err_sock");
1003
1004 /* Getting status code from kconsumerd */
1005 ret = lttcomm_recv_unix_sock(sock, &code,
1006 sizeof(enum lttcomm_return_code));
1007 if (ret <= 0) {
1008 goto error;
1009 }
1010
1011 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1012 consumer_data->cmd_sock =
1013 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1014 if (consumer_data->cmd_sock < 0) {
1015 sem_post(&consumer_data->sem);
1016 PERROR("consumer connect");
1017 goto error;
1018 }
1019 /* Signal condition to tell that the kconsumerd is ready */
1020 sem_post(&consumer_data->sem);
1021 DBG("consumer command socket ready");
1022 } else {
1023 ERR("consumer error when waiting for SOCK_READY : %s",
1024 lttcomm_get_readable_code(-code));
1025 goto error;
1026 }
1027
1028 /* Remove the kconsumerd error sock since we've established a connexion */
1029 ret = lttng_poll_del(&events, consumer_data->err_sock);
1030 if (ret < 0) {
1031 goto error;
1032 }
1033
1034 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1035 if (ret < 0) {
1036 goto error;
1037 }
1038
1039 /* Update number of fd */
1040 nb_fd = LTTNG_POLL_GETNB(&events);
1041
1042 /* Inifinite blocking call, waiting for transmission */
1043 restart_poll:
1044 ret = lttng_poll_wait(&events, -1);
1045 if (ret < 0) {
1046 /*
1047 * Restart interrupted system call.
1048 */
1049 if (errno == EINTR) {
1050 goto restart_poll;
1051 }
1052 goto error;
1053 }
1054
1055 for (i = 0; i < nb_fd; i++) {
1056 /* Fetch once the poll data */
1057 revents = LTTNG_POLL_GETEV(&events, i);
1058 pollfd = LTTNG_POLL_GETFD(&events, i);
1059
1060 /* Thread quit pipe has been closed. Killing thread. */
1061 ret = check_thread_quit_pipe(pollfd, revents);
1062 if (ret) {
1063 goto error;
1064 }
1065
1066 /* Event on the kconsumerd socket */
1067 if (pollfd == sock) {
1068 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1069 ERR("consumer err socket second poll error");
1070 goto error;
1071 }
1072 }
1073 }
1074
1075 /* Wait for any kconsumerd error */
1076 ret = lttcomm_recv_unix_sock(sock, &code,
1077 sizeof(enum lttcomm_return_code));
1078 if (ret <= 0) {
1079 ERR("consumer closed the command socket");
1080 goto error;
1081 }
1082
1083 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1084
1085 error:
1086 DBG("consumer thread dying");
1087 close(consumer_data->err_sock);
1088 close(consumer_data->cmd_sock);
1089 close(sock);
1090
1091 unlink(consumer_data->err_unix_sock_path);
1092 unlink(consumer_data->cmd_unix_sock_path);
1093 consumer_data->pid = 0;
1094
1095 lttng_poll_clean(&events);
1096
1097 return NULL;
1098 }
1099
1100 /*
1101 * This thread manage application communication.
1102 */
1103 static void *thread_manage_apps(void *data)
1104 {
1105 int i, ret, pollfd;
1106 uint32_t revents, nb_fd;
1107 struct ust_command ust_cmd;
1108 struct lttng_poll_event events;
1109
1110 tracepoint(sessiond_th_apps_start);
1111
1112 DBG("[thread] Manage application started");
1113
1114 rcu_register_thread();
1115 rcu_thread_online();
1116
1117 ret = create_thread_poll_set(&events, 2);
1118 if (ret < 0) {
1119 goto error;
1120 }
1121
1122 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1123 if (ret < 0) {
1124 goto error;
1125 }
1126
1127 while (1) {
1128 /* Zeroed the events structure */
1129 lttng_poll_reset(&events);
1130
1131 nb_fd = LTTNG_POLL_GETNB(&events);
1132
1133 DBG("Apps thread polling on %d fds", nb_fd);
1134
1135 tracepoint(sessiond_th_apps_poll);
1136
1137 /* Inifinite blocking call, waiting for transmission */
1138 restart:
1139 ret = lttng_poll_wait(&events, -1);
1140 if (ret < 0) {
1141 /*
1142 * Restart interrupted system call.
1143 */
1144 if (errno == EINTR) {
1145 goto restart;
1146 }
1147 goto error;
1148 }
1149
1150 for (i = 0; i < nb_fd; i++) {
1151 /* Fetch once the poll data */
1152 revents = LTTNG_POLL_GETEV(&events, i);
1153 pollfd = LTTNG_POLL_GETFD(&events, i);
1154
1155 /* Thread quit pipe has been closed. Killing thread. */
1156 ret = check_thread_quit_pipe(pollfd, revents);
1157 if (ret) {
1158 goto error;
1159 }
1160
1161 /* Inspect the apps cmd pipe */
1162 if (pollfd == apps_cmd_pipe[0]) {
1163 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1164 ERR("Apps command pipe error");
1165 goto error;
1166 } else if (revents & LPOLLIN) {
1167 system("sysctl vm.drop_caches=3");
1168 tracepoint(ust_register_read_start);
1169 /* Empty pipe */
1170 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1171 if (ret < 0 || ret < sizeof(ust_cmd)) {
1172 perror("read apps cmd pipe");
1173 goto error;
1174 }
1175 tracepoint(ust_register_read_stop);
1176
1177 tracepoint(ust_register_add_start);
1178 /* Register applicaton to the session daemon */
1179 ret = ust_app_register(&ust_cmd.reg_msg,
1180 ust_cmd.sock);
1181 if (ret == -ENOMEM) {
1182 goto error;
1183 } else if (ret < 0) {
1184 break;
1185 }
1186 tracepoint(ust_register_add_stop);
1187
1188 /*
1189 * Validate UST version compatibility.
1190 */
1191 ret = ust_app_validate_version(ust_cmd.sock);
1192 if (ret >= 0) {
1193 /*
1194 * Add channel(s) and event(s) to newly registered apps
1195 * from lttng global UST domain.
1196 */
1197 update_ust_app(ust_cmd.sock);
1198 }
1199
1200 tracepoint(ust_register_done_start);
1201 ret = ust_app_register_done(ust_cmd.sock);
1202 if (ret < 0) {
1203 /*
1204 * If the registration is not possible, we simply
1205 * unregister the apps and continue
1206 */
1207 ust_app_unregister(ust_cmd.sock);
1208 } else {
1209 tracepoint(ust_register_done_stop);
1210 /*
1211 * We just need here to monitor the close of the UST
1212 * socket and poll set monitor those by default.
1213 */
1214 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1215 if (ret < 0) {
1216 goto error;
1217 }
1218
1219 DBG("Apps with sock %d added to poll set",
1220 ust_cmd.sock);
1221 }
1222 break;
1223 }
1224 } else {
1225 /*
1226 * At this point, we know that a registered application made
1227 * the event at poll_wait.
1228 */
1229 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1230 tracepoint(ust_unregister_start);
1231
1232 /* Removing from the poll set */
1233 ret = lttng_poll_del(&events, pollfd);
1234 if (ret < 0) {
1235 goto error;
1236 }
1237
1238 /* Socket closed on remote end. */
1239 ust_app_unregister(pollfd);
1240
1241 tracepoint(ust_unregister_stop);
1242 break;
1243 }
1244 }
1245 }
1246 }
1247
1248 error:
1249 DBG("Application communication apps dying");
1250 close(apps_cmd_pipe[0]);
1251 close(apps_cmd_pipe[1]);
1252
1253 lttng_poll_clean(&events);
1254
1255 rcu_thread_offline();
1256 rcu_unregister_thread();
1257 return NULL;
1258 }
1259
1260 /*
1261 * Dispatch request from the registration threads to the application
1262 * communication thread.
1263 */
1264 static void *thread_dispatch_ust_registration(void *data)
1265 {
1266 int ret;
1267 struct cds_wfq_node *node;
1268 struct ust_command *ust_cmd = NULL;
1269
1270 tracepoint(sessiond_th_dispatch_start);
1271
1272 DBG("[thread] Dispatch UST command started");
1273
1274 while (!dispatch_thread_exit) {
1275 /* Atomically prepare the queue futex */
1276 futex_nto1_prepare(&ust_cmd_queue.futex);
1277
1278 do {
1279 tracepoint(sessiond_th_dispatch_block);
1280
1281 /* Dequeue command for registration */
1282 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1283 if (node == NULL) {
1284 DBG("Woken up but nothing in the UST command queue");
1285 /* Continue thread execution */
1286 break;
1287 }
1288
1289 tracepoint(ust_dispatch_register_start);
1290
1291 ust_cmd = caa_container_of(node, struct ust_command, node);
1292
1293 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1294 " gid:%d sock:%d name:%s (version %d.%d)",
1295 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1296 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1297 ust_cmd->sock, ust_cmd->reg_msg.name,
1298 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1299 /*
1300 * Inform apps thread of the new application registration. This
1301 * call is blocking so we can be assured that the data will be read
1302 * at some point in time or wait to the end of the world :)
1303 */
1304 ret = write(apps_cmd_pipe[1], ust_cmd,
1305 sizeof(struct ust_command));
1306 if (ret < 0) {
1307 perror("write apps cmd pipe");
1308 if (errno == EBADF) {
1309 /*
1310 * We can't inform the application thread to process
1311 * registration. We will exit or else application
1312 * registration will not occur and tracing will never
1313 * start.
1314 */
1315 goto error;
1316 }
1317 }
1318 free(ust_cmd);
1319 } while (node != NULL);
1320
1321 tracepoint(ust_dispatch_register_stop);
1322
1323 /* Futex wait on queue. Blocking call on futex() */
1324 futex_nto1_wait(&ust_cmd_queue.futex);
1325 }
1326
1327 error:
1328 DBG("Dispatch thread dying");
1329 return NULL;
1330 }
1331
1332 /*
1333 * This thread manage application registration.
1334 */
1335 static void *thread_registration_apps(void *data)
1336 {
1337 int sock = 0, i, ret, pollfd;
1338 uint32_t revents, nb_fd;
1339 struct lttng_poll_event events;
1340 /*
1341 * Get allocated in this thread, enqueued to a global queue, dequeued and
1342 * freed in the manage apps thread.
1343 */
1344 struct ust_command *ust_cmd = NULL;
1345
1346 tracepoint(sessiond_th_reg_start);
1347
1348 DBG("[thread] Manage application registration started");
1349
1350 ret = lttcomm_listen_unix_sock(apps_sock);
1351 if (ret < 0) {
1352 goto error;
1353 }
1354
1355 /*
1356 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1357 * more will be added to this poll set.
1358 */
1359 ret = create_thread_poll_set(&events, 2);
1360 if (ret < 0) {
1361 goto error;
1362 }
1363
1364 /* Add the application registration socket */
1365 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1366 if (ret < 0) {
1367 goto error;
1368 }
1369
1370 /* Notify all applications to register */
1371 ret = notify_ust_apps(1);
1372 if (ret < 0) {
1373 ERR("Failed to notify applications or create the wait shared memory.\n"
1374 "Execution continues but there might be problem for already\n"
1375 "running applications that wishes to register.");
1376 }
1377
1378 while (1) {
1379 DBG("Accepting application registration");
1380
1381 tracepoint(sessiond_th_reg_poll);
1382
1383 nb_fd = LTTNG_POLL_GETNB(&events);
1384
1385 /* Inifinite blocking call, waiting for transmission */
1386 restart:
1387 ret = lttng_poll_wait(&events, -1);
1388 if (ret < 0) {
1389 /*
1390 * Restart interrupted system call.
1391 */
1392 if (errno == EINTR) {
1393 goto restart;
1394 }
1395 goto error;
1396 }
1397
1398 for (i = 0; i < nb_fd; i++) {
1399 /* Fetch once the poll data */
1400 revents = LTTNG_POLL_GETEV(&events, i);
1401 pollfd = LTTNG_POLL_GETFD(&events, i);
1402
1403 /* Thread quit pipe has been closed. Killing thread. */
1404 ret = check_thread_quit_pipe(pollfd, revents);
1405 if (ret) {
1406 goto error;
1407 }
1408
1409 /* Event on the registration socket */
1410 if (pollfd == apps_sock) {
1411 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1412 ERR("Register apps socket poll error");
1413 goto error;
1414 } else if (revents & LPOLLIN) {
1415 /* Registration starts here. Recording cycles */
1416 tracepoint(ust_register_start);
1417
1418 sock = lttcomm_accept_unix_sock(apps_sock);
1419 if (sock < 0) {
1420 goto error;
1421 }
1422
1423 /* Create UST registration command for enqueuing */
1424 ust_cmd = zmalloc(sizeof(struct ust_command));
1425 if (ust_cmd == NULL) {
1426 perror("ust command zmalloc");
1427 goto error;
1428 }
1429
1430 /*
1431 * Using message-based transmissions to ensure we don't
1432 * have to deal with partially received messages.
1433 */
1434 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1435 sizeof(struct ust_register_msg));
1436 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1437 if (ret < 0) {
1438 perror("lttcomm_recv_unix_sock register apps");
1439 } else {
1440 ERR("Wrong size received on apps register");
1441 }
1442 free(ust_cmd);
1443 close(sock);
1444 continue;
1445 }
1446
1447 ust_cmd->sock = sock;
1448
1449 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1450 " gid:%d sock:%d name:%s (version %d.%d)",
1451 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1452 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1453 ust_cmd->sock, ust_cmd->reg_msg.name,
1454 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1455
1456 /*
1457 * Lock free enqueue the registration request. The red pill
1458 * has been taken! This apps will be part of the *system*.
1459 */
1460 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1461
1462 /*
1463 * Wake the registration queue futex. Implicit memory
1464 * barrier with the exchange in cds_wfq_enqueue.
1465 */
1466 futex_nto1_wake(&ust_cmd_queue.futex);
1467
1468 tracepoint(ust_register_stop);
1469 }
1470 }
1471 }
1472 }
1473
1474 error:
1475 DBG("UST Registration thread dying");
1476
1477 /* Notify that the registration thread is gone */
1478 notify_ust_apps(0);
1479
1480 close(apps_sock);
1481 close(sock);
1482 unlink(apps_unix_sock_path);
1483
1484 lttng_poll_clean(&events);
1485
1486 return NULL;
1487 }
1488
1489 /*
1490 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1491 * exec or it will fails.
1492 */
1493 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1494 {
1495 int ret;
1496 struct timespec timeout;
1497
1498 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1499 timeout.tv_nsec = 0;
1500
1501 /* Setup semaphore */
1502 ret = sem_init(&consumer_data->sem, 0, 0);
1503 if (ret < 0) {
1504 PERROR("sem_init consumer semaphore");
1505 goto error;
1506 }
1507
1508 ret = pthread_create(&consumer_data->thread, NULL,
1509 thread_manage_consumer, consumer_data);
1510 if (ret != 0) {
1511 PERROR("pthread_create consumer");
1512 ret = -1;
1513 goto error;
1514 }
1515
1516 /* Get time for sem_timedwait absolute timeout */
1517 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1518 if (ret < 0) {
1519 PERROR("clock_gettime spawn consumer");
1520 /* Infinite wait for the kconsumerd thread to be ready */
1521 ret = sem_wait(&consumer_data->sem);
1522 } else {
1523 /* Normal timeout if the gettime was successful */
1524 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1525 ret = sem_timedwait(&consumer_data->sem, &timeout);
1526 }
1527
1528 if (ret < 0) {
1529 if (errno == ETIMEDOUT) {
1530 /*
1531 * Call has timed out so we kill the kconsumerd_thread and return
1532 * an error.
1533 */
1534 ERR("The consumer thread was never ready. Killing it");
1535 ret = pthread_cancel(consumer_data->thread);
1536 if (ret < 0) {
1537 PERROR("pthread_cancel consumer thread");
1538 }
1539 } else {
1540 PERROR("semaphore wait failed consumer thread");
1541 }
1542 goto error;
1543 }
1544
1545 pthread_mutex_lock(&consumer_data->pid_mutex);
1546 if (consumer_data->pid == 0) {
1547 ERR("Kconsumerd did not start");
1548 pthread_mutex_unlock(&consumer_data->pid_mutex);
1549 goto error;
1550 }
1551 pthread_mutex_unlock(&consumer_data->pid_mutex);
1552
1553 return 0;
1554
1555 error:
1556 return ret;
1557 }
1558
1559 /*
1560 * Join consumer thread
1561 */
1562 static int join_consumer_thread(struct consumer_data *consumer_data)
1563 {
1564 void *status;
1565 int ret;
1566
1567 if (consumer_data->pid != 0) {
1568 ret = kill(consumer_data->pid, SIGTERM);
1569 if (ret) {
1570 ERR("Error killing consumer daemon");
1571 return ret;
1572 }
1573 return pthread_join(consumer_data->thread, &status);
1574 } else {
1575 return 0;
1576 }
1577 }
1578
1579 /*
1580 * Fork and exec a consumer daemon (consumerd).
1581 *
1582 * Return pid if successful else -1.
1583 */
1584 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1585 {
1586 int ret;
1587 pid_t pid;
1588 const char *consumer_to_use;
1589 const char *verbosity;
1590 struct stat st;
1591
1592 DBG("Spawning consumerd");
1593
1594 pid = fork();
1595 if (pid == 0) {
1596 /*
1597 * Exec consumerd.
1598 */
1599 if (opt_verbose_consumer) {
1600 verbosity = "--verbose";
1601 } else {
1602 verbosity = "--quiet";
1603 }
1604 switch (consumer_data->type) {
1605 case LTTNG_CONSUMER_KERNEL:
1606 /*
1607 * Find out which consumerd to execute. We will first try the
1608 * 64-bit path, then the sessiond's installation directory, and
1609 * fallback on the 32-bit one,
1610 */
1611 DBG3("Looking for a kernel consumer at these locations:");
1612 DBG3(" 1) %s", consumerd64_bin);
1613 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1614 DBG3(" 3) %s", consumerd32_bin);
1615 if (stat(consumerd64_bin, &st) == 0) {
1616 DBG3("Found location #1");
1617 consumer_to_use = consumerd64_bin;
1618 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1619 DBG3("Found location #2");
1620 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1621 } else if (stat(consumerd32_bin, &st) == 0) {
1622 DBG3("Found location #3");
1623 consumer_to_use = consumerd32_bin;
1624 } else {
1625 DBG("Could not find any valid consumerd executable");
1626 break;
1627 }
1628 DBG("Using kernel consumer at: %s", consumer_to_use);
1629 execl(consumer_to_use,
1630 "lttng-consumerd", verbosity, "-k",
1631 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1632 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1633 NULL);
1634 break;
1635 case LTTNG_CONSUMER64_UST:
1636 {
1637 char *tmpnew = NULL;
1638
1639 if (consumerd64_libdir[0] != '\0') {
1640 char *tmp;
1641 size_t tmplen;
1642
1643 tmp = getenv("LD_LIBRARY_PATH");
1644 if (!tmp) {
1645 tmp = "";
1646 }
1647 tmplen = strlen("LD_LIBRARY_PATH=")
1648 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1649 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1650 if (!tmpnew) {
1651 ret = -ENOMEM;
1652 goto error;
1653 }
1654 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1655 strcat(tmpnew, consumerd64_libdir);
1656 if (tmp[0] != '\0') {
1657 strcat(tmpnew, ":");
1658 strcat(tmpnew, tmp);
1659 }
1660 ret = putenv(tmpnew);
1661 if (ret) {
1662 ret = -errno;
1663 goto error;
1664 }
1665 }
1666 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1667 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1668 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1669 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1670 NULL);
1671 if (consumerd64_libdir[0] != '\0') {
1672 free(tmpnew);
1673 }
1674 if (ret) {
1675 goto error;
1676 }
1677 break;
1678 }
1679 case LTTNG_CONSUMER32_UST:
1680 {
1681 char *tmpnew = NULL;
1682
1683 if (consumerd32_libdir[0] != '\0') {
1684 char *tmp;
1685 size_t tmplen;
1686
1687 tmp = getenv("LD_LIBRARY_PATH");
1688 if (!tmp) {
1689 tmp = "";
1690 }
1691 tmplen = strlen("LD_LIBRARY_PATH=")
1692 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1693 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1694 if (!tmpnew) {
1695 ret = -ENOMEM;
1696 goto error;
1697 }
1698 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1699 strcat(tmpnew, consumerd32_libdir);
1700 if (tmp[0] != '\0') {
1701 strcat(tmpnew, ":");
1702 strcat(tmpnew, tmp);
1703 }
1704 ret = putenv(tmpnew);
1705 if (ret) {
1706 ret = -errno;
1707 goto error;
1708 }
1709 }
1710 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1711 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1712 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1713 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1714 NULL);
1715 if (consumerd32_libdir[0] != '\0') {
1716 free(tmpnew);
1717 }
1718 if (ret) {
1719 goto error;
1720 }
1721 break;
1722 }
1723 default:
1724 perror("unknown consumer type");
1725 exit(EXIT_FAILURE);
1726 }
1727 if (errno != 0) {
1728 perror("kernel start consumer exec");
1729 }
1730 exit(EXIT_FAILURE);
1731 } else if (pid > 0) {
1732 ret = pid;
1733 } else {
1734 perror("start consumer fork");
1735 ret = -errno;
1736 }
1737 error:
1738 return ret;
1739 }
1740
1741 /*
1742 * Spawn the consumerd daemon and session daemon thread.
1743 */
1744 static int start_consumerd(struct consumer_data *consumer_data)
1745 {
1746 int ret;
1747
1748 pthread_mutex_lock(&consumer_data->pid_mutex);
1749 if (consumer_data->pid != 0) {
1750 pthread_mutex_unlock(&consumer_data->pid_mutex);
1751 goto end;
1752 }
1753
1754 ret = spawn_consumerd(consumer_data);
1755 if (ret < 0) {
1756 ERR("Spawning consumerd failed");
1757 pthread_mutex_unlock(&consumer_data->pid_mutex);
1758 goto error;
1759 }
1760
1761 /* Setting up the consumer_data pid */
1762 consumer_data->pid = ret;
1763 DBG2("Consumer pid %d", consumer_data->pid);
1764 pthread_mutex_unlock(&consumer_data->pid_mutex);
1765
1766 DBG2("Spawning consumer control thread");
1767 ret = spawn_consumer_thread(consumer_data);
1768 if (ret < 0) {
1769 ERR("Fatal error spawning consumer control thread");
1770 goto error;
1771 }
1772
1773 end:
1774 return 0;
1775
1776 error:
1777 return ret;
1778 }
1779
1780 /*
1781 * Check version of the lttng-modules.
1782 */
1783 static int validate_lttng_modules_version(void)
1784 {
1785 return kernel_validate_version(kernel_tracer_fd);
1786 }
1787
1788 /*
1789 * Setup necessary data for kernel tracer action.
1790 */
1791 static int init_kernel_tracer(void)
1792 {
1793 int ret;
1794
1795 /* Modprobe lttng kernel modules */
1796 ret = modprobe_lttng_control();
1797 if (ret < 0) {
1798 goto error;
1799 }
1800
1801 /* Open debugfs lttng */
1802 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1803 if (kernel_tracer_fd < 0) {
1804 DBG("Failed to open %s", module_proc_lttng);
1805 ret = -1;
1806 goto error_open;
1807 }
1808
1809 /* Validate kernel version */
1810 ret = validate_lttng_modules_version();
1811 if (ret < 0) {
1812 goto error_version;
1813 }
1814
1815 ret = modprobe_lttng_data();
1816 if (ret < 0) {
1817 goto error_modules;
1818 }
1819
1820 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1821 return 0;
1822
1823 error_version:
1824 modprobe_remove_lttng_control();
1825 close(kernel_tracer_fd);
1826 kernel_tracer_fd = 0;
1827 return LTTCOMM_KERN_VERSION;
1828
1829 error_modules:
1830 close(kernel_tracer_fd);
1831
1832 error_open:
1833 modprobe_remove_lttng_control();
1834
1835 error:
1836 WARN("No kernel tracer available");
1837 kernel_tracer_fd = 0;
1838 return LTTCOMM_KERN_NA;
1839 }
1840
1841 /*
1842 * Init tracing by creating trace directory and sending fds kernel consumer.
1843 */
1844 static int init_kernel_tracing(struct ltt_kernel_session *session)
1845 {
1846 int ret = 0;
1847
1848 if (session->consumer_fds_sent == 0) {
1849 /*
1850 * Assign default kernel consumer socket if no consumer assigned to the
1851 * kernel session. At this point, it's NOT suppose to be 0 but this is
1852 * an extra security check.
1853 */
1854 if (session->consumer_fd == 0) {
1855 session->consumer_fd = kconsumer_data.cmd_sock;
1856 }
1857
1858 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1859 if (ret < 0) {
1860 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1861 goto error;
1862 }
1863
1864 session->consumer_fds_sent = 1;
1865 }
1866
1867 error:
1868 return ret;
1869 }
1870
1871 /*
1872 * Create an UST session and add it to the session ust list.
1873 */
1874 static int create_ust_session(struct ltt_session *session,
1875 struct lttng_domain *domain)
1876 {
1877 struct ltt_ust_session *lus = NULL;
1878 int ret;
1879
1880 switch (domain->type) {
1881 case LTTNG_DOMAIN_UST:
1882 break;
1883 default:
1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
1885 goto error;
1886 }
1887
1888 DBG("Creating UST session");
1889
1890 lus = trace_ust_create_session(session->path, session->id, domain);
1891 if (lus == NULL) {
1892 ret = LTTCOMM_UST_SESS_FAIL;
1893 goto error;
1894 }
1895
1896 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1897 session->uid, session->gid);
1898 if (ret < 0) {
1899 if (ret != -EEXIST) {
1900 ERR("Trace directory creation error");
1901 ret = LTTCOMM_UST_SESS_FAIL;
1902 goto error;
1903 }
1904 }
1905
1906 /* The domain type dictate different actions on session creation */
1907 switch (domain->type) {
1908 case LTTNG_DOMAIN_UST:
1909 /* No ustctl for the global UST domain */
1910 break;
1911 default:
1912 ERR("Unknown UST domain on create session %d", domain->type);
1913 goto error;
1914 }
1915 lus->uid = session->uid;
1916 lus->gid = session->gid;
1917 session->ust_session = lus;
1918
1919 return LTTCOMM_OK;
1920
1921 error:
1922 free(lus);
1923 return ret;
1924 }
1925
1926 /*
1927 * Create a kernel tracer session then create the default channel.
1928 */
1929 static int create_kernel_session(struct ltt_session *session)
1930 {
1931 int ret;
1932
1933 DBG("Creating kernel session");
1934
1935 ret = kernel_create_session(session, kernel_tracer_fd);
1936 if (ret < 0) {
1937 ret = LTTCOMM_KERN_SESS_FAIL;
1938 goto error;
1939 }
1940
1941 /* Set kernel consumer socket fd */
1942 if (kconsumer_data.cmd_sock) {
1943 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1944 }
1945
1946 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1947 S_IRWXU | S_IRWXG, session->uid, session->gid);
1948 if (ret < 0) {
1949 if (ret != -EEXIST) {
1950 ERR("Trace directory creation error");
1951 goto error;
1952 }
1953 }
1954 session->kernel_session->uid = session->uid;
1955 session->kernel_session->gid = session->gid;
1956
1957 error:
1958 return ret;
1959 }
1960
1961 /*
1962 * Check if the UID or GID match the session. Root user has access to all
1963 * sessions.
1964 */
1965 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1966 {
1967 if (uid != session->uid && gid != session->gid && uid != 0) {
1968 return 0;
1969 } else {
1970 return 1;
1971 }
1972 }
1973
1974 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1975 {
1976 unsigned int i = 0;
1977 struct ltt_session *session;
1978
1979 DBG("Counting number of available session for UID %d GID %d",
1980 uid, gid);
1981 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1982 /*
1983 * Only list the sessions the user can control.
1984 */
1985 if (!session_access_ok(session, uid, gid)) {
1986 continue;
1987 }
1988 i++;
1989 }
1990 return i;
1991 }
1992
1993 /*
1994 * Using the session list, filled a lttng_session array to send back to the
1995 * client for session listing.
1996 *
1997 * The session list lock MUST be acquired before calling this function. Use
1998 * session_lock_list() and session_unlock_list().
1999 */
2000 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2001 gid_t gid)
2002 {
2003 unsigned int i = 0;
2004 struct ltt_session *session;
2005
2006 DBG("Getting all available session for UID %d GID %d",
2007 uid, gid);
2008 /*
2009 * Iterate over session list and append data after the control struct in
2010 * the buffer.
2011 */
2012 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2013 /*
2014 * Only list the sessions the user can control.
2015 */
2016 if (!session_access_ok(session, uid, gid)) {
2017 continue;
2018 }
2019 strncpy(sessions[i].path, session->path, PATH_MAX);
2020 sessions[i].path[PATH_MAX - 1] = '\0';
2021 strncpy(sessions[i].name, session->name, NAME_MAX);
2022 sessions[i].name[NAME_MAX - 1] = '\0';
2023 sessions[i].enabled = session->enabled;
2024 i++;
2025 }
2026 }
2027
2028 /*
2029 * Fill lttng_channel array of all channels.
2030 */
2031 static void list_lttng_channels(int domain, struct ltt_session *session,
2032 struct lttng_channel *channels)
2033 {
2034 int i = 0;
2035 struct ltt_kernel_channel *kchan;
2036
2037 DBG("Listing channels for session %s", session->name);
2038
2039 switch (domain) {
2040 case LTTNG_DOMAIN_KERNEL:
2041 /* Kernel channels */
2042 if (session->kernel_session != NULL) {
2043 cds_list_for_each_entry(kchan,
2044 &session->kernel_session->channel_list.head, list) {
2045 /* Copy lttng_channel struct to array */
2046 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2047 channels[i].enabled = kchan->enabled;
2048 i++;
2049 }
2050 }
2051 break;
2052 case LTTNG_DOMAIN_UST:
2053 {
2054 struct lttng_ht_iter iter;
2055 struct ltt_ust_channel *uchan;
2056
2057 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2058 &iter.iter, uchan, node.node) {
2059 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2060 channels[i].attr.overwrite = uchan->attr.overwrite;
2061 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2062 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2063 channels[i].attr.switch_timer_interval =
2064 uchan->attr.switch_timer_interval;
2065 channels[i].attr.read_timer_interval =
2066 uchan->attr.read_timer_interval;
2067 channels[i].enabled = uchan->enabled;
2068 switch (uchan->attr.output) {
2069 case LTTNG_UST_MMAP:
2070 default:
2071 channels[i].attr.output = LTTNG_EVENT_MMAP;
2072 break;
2073 }
2074 i++;
2075 }
2076 break;
2077 }
2078 default:
2079 break;
2080 }
2081 }
2082
2083 /*
2084 * Create a list of ust global domain events.
2085 */
2086 static int list_lttng_ust_global_events(char *channel_name,
2087 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2088 {
2089 int i = 0, ret = 0;
2090 unsigned int nb_event = 0;
2091 struct lttng_ht_iter iter;
2092 struct lttng_ht_node_str *node;
2093 struct ltt_ust_channel *uchan;
2094 struct ltt_ust_event *uevent;
2095 struct lttng_event *tmp;
2096
2097 DBG("Listing UST global events for channel %s", channel_name);
2098
2099 rcu_read_lock();
2100
2101 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2102 node = lttng_ht_iter_get_node_str(&iter);
2103 if (node == NULL) {
2104 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2105 goto error;
2106 }
2107
2108 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2109
2110 nb_event += lttng_ht_get_count(uchan->events);
2111
2112 if (nb_event == 0) {
2113 ret = nb_event;
2114 goto error;
2115 }
2116
2117 DBG3("Listing UST global %d events", nb_event);
2118
2119 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2120 if (tmp == NULL) {
2121 ret = -LTTCOMM_FATAL;
2122 goto error;
2123 }
2124
2125 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2126 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2127 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2128 tmp[i].enabled = uevent->enabled;
2129 switch (uevent->attr.instrumentation) {
2130 case LTTNG_UST_TRACEPOINT:
2131 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2132 break;
2133 case LTTNG_UST_PROBE:
2134 tmp[i].type = LTTNG_EVENT_PROBE;
2135 break;
2136 case LTTNG_UST_FUNCTION:
2137 tmp[i].type = LTTNG_EVENT_FUNCTION;
2138 break;
2139 }
2140 tmp[i].loglevel = uevent->attr.loglevel;
2141 switch (uevent->attr.loglevel_type) {
2142 case LTTNG_UST_LOGLEVEL_ALL:
2143 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2144 break;
2145 case LTTNG_UST_LOGLEVEL_RANGE:
2146 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2147 break;
2148 case LTTNG_UST_LOGLEVEL_SINGLE:
2149 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2150 break;
2151 }
2152 i++;
2153 }
2154
2155 ret = nb_event;
2156 *events = tmp;
2157
2158 error:
2159 rcu_read_unlock();
2160 return ret;
2161 }
2162
2163 /*
2164 * Fill lttng_event array of all kernel events in the channel.
2165 */
2166 static int list_lttng_kernel_events(char *channel_name,
2167 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2168 {
2169 int i = 0, ret;
2170 unsigned int nb_event;
2171 struct ltt_kernel_event *event;
2172 struct ltt_kernel_channel *kchan;
2173
2174 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2175 if (kchan == NULL) {
2176 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2177 goto error;
2178 }
2179
2180 nb_event = kchan->event_count;
2181
2182 DBG("Listing events for channel %s", kchan->channel->name);
2183
2184 if (nb_event == 0) {
2185 ret = nb_event;
2186 goto error;
2187 }
2188
2189 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2190 if (*events == NULL) {
2191 ret = LTTCOMM_FATAL;
2192 goto error;
2193 }
2194
2195 /* Kernel channels */
2196 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2197 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2198 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2199 (*events)[i].enabled = event->enabled;
2200 switch (event->event->instrumentation) {
2201 case LTTNG_KERNEL_TRACEPOINT:
2202 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2203 break;
2204 case LTTNG_KERNEL_KPROBE:
2205 case LTTNG_KERNEL_KRETPROBE:
2206 (*events)[i].type = LTTNG_EVENT_PROBE;
2207 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2208 sizeof(struct lttng_kernel_kprobe));
2209 break;
2210 case LTTNG_KERNEL_FUNCTION:
2211 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2212 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2213 sizeof(struct lttng_kernel_function));
2214 break;
2215 case LTTNG_KERNEL_NOOP:
2216 (*events)[i].type = LTTNG_EVENT_NOOP;
2217 break;
2218 case LTTNG_KERNEL_SYSCALL:
2219 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2220 break;
2221 case LTTNG_KERNEL_ALL:
2222 assert(0);
2223 break;
2224 }
2225 i++;
2226 }
2227
2228 return nb_event;
2229
2230 error:
2231 return ret;
2232 }
2233
2234 /*
2235 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2236 */
2237 static int cmd_disable_channel(struct ltt_session *session,
2238 int domain, char *channel_name)
2239 {
2240 int ret;
2241 struct ltt_ust_session *usess;
2242
2243 usess = session->ust_session;
2244
2245 switch (domain) {
2246 case LTTNG_DOMAIN_KERNEL:
2247 {
2248 ret = channel_kernel_disable(session->kernel_session,
2249 channel_name);
2250 if (ret != LTTCOMM_OK) {
2251 goto error;
2252 }
2253
2254 kernel_wait_quiescent(kernel_tracer_fd);
2255 break;
2256 }
2257 case LTTNG_DOMAIN_UST:
2258 {
2259 struct ltt_ust_channel *uchan;
2260 struct lttng_ht *chan_ht;
2261
2262 chan_ht = usess->domain_global.channels;
2263
2264 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2265 if (uchan == NULL) {
2266 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2267 goto error;
2268 }
2269
2270 ret = channel_ust_disable(usess, domain, uchan);
2271 if (ret != LTTCOMM_OK) {
2272 goto error;
2273 }
2274 break;
2275 }
2276 #if 0
2277 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2278 case LTTNG_DOMAIN_UST_EXEC_NAME:
2279 case LTTNG_DOMAIN_UST_PID:
2280 #endif
2281 default:
2282 ret = LTTCOMM_UNKNOWN_DOMAIN;
2283 goto error;
2284 }
2285
2286 ret = LTTCOMM_OK;
2287
2288 error:
2289 return ret;
2290 }
2291
2292 /*
2293 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2294 */
2295 static int cmd_enable_channel(struct ltt_session *session,
2296 int domain, struct lttng_channel *attr)
2297 {
2298 int ret;
2299 struct ltt_ust_session *usess = session->ust_session;
2300 struct lttng_ht *chan_ht;
2301
2302 DBG("Enabling channel %s for session %s", attr->name, session->name);
2303
2304 switch (domain) {
2305 case LTTNG_DOMAIN_KERNEL:
2306 {
2307 struct ltt_kernel_channel *kchan;
2308
2309 kchan = trace_kernel_get_channel_by_name(attr->name,
2310 session->kernel_session);
2311 if (kchan == NULL) {
2312 ret = channel_kernel_create(session->kernel_session,
2313 attr, kernel_poll_pipe[1]);
2314 } else {
2315 ret = channel_kernel_enable(session->kernel_session, kchan);
2316 }
2317
2318 if (ret != LTTCOMM_OK) {
2319 goto error;
2320 }
2321
2322 kernel_wait_quiescent(kernel_tracer_fd);
2323 break;
2324 }
2325 case LTTNG_DOMAIN_UST:
2326 {
2327 struct ltt_ust_channel *uchan;
2328
2329 chan_ht = usess->domain_global.channels;
2330
2331 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2332 if (uchan == NULL) {
2333 ret = channel_ust_create(usess, domain, attr);
2334 } else {
2335 ret = channel_ust_enable(usess, domain, uchan);
2336 }
2337 break;
2338 }
2339 #if 0
2340 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2341 case LTTNG_DOMAIN_UST_EXEC_NAME:
2342 case LTTNG_DOMAIN_UST_PID:
2343 #endif
2344 default:
2345 ret = LTTCOMM_UNKNOWN_DOMAIN;
2346 goto error;
2347 }
2348
2349 error:
2350 return ret;
2351 }
2352
2353 /*
2354 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2355 */
2356 static int cmd_disable_event(struct ltt_session *session, int domain,
2357 char *channel_name, char *event_name)
2358 {
2359 int ret;
2360
2361 switch (domain) {
2362 case LTTNG_DOMAIN_KERNEL:
2363 {
2364 struct ltt_kernel_channel *kchan;
2365 struct ltt_kernel_session *ksess;
2366
2367 ksess = session->kernel_session;
2368
2369 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2370 if (kchan == NULL) {
2371 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2372 goto error;
2373 }
2374
2375 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2376 if (ret != LTTCOMM_OK) {
2377 goto error;
2378 }
2379
2380 kernel_wait_quiescent(kernel_tracer_fd);
2381 break;
2382 }
2383 case LTTNG_DOMAIN_UST:
2384 {
2385 struct ltt_ust_channel *uchan;
2386 struct ltt_ust_session *usess;
2387
2388 usess = session->ust_session;
2389
2390 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2391 channel_name);
2392 if (uchan == NULL) {
2393 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2394 goto error;
2395 }
2396
2397 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2398 if (ret != LTTCOMM_OK) {
2399 goto error;
2400 }
2401
2402 DBG3("Disable UST event %s in channel %s completed", event_name,
2403 channel_name);
2404 break;
2405 }
2406 #if 0
2407 case LTTNG_DOMAIN_UST_EXEC_NAME:
2408 case LTTNG_DOMAIN_UST_PID:
2409 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2410 #endif
2411 default:
2412 ret = LTTCOMM_UND;
2413 goto error;
2414 }
2415
2416 ret = LTTCOMM_OK;
2417
2418 error:
2419 return ret;
2420 }
2421
2422 /*
2423 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2424 */
2425 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2426 char *channel_name)
2427 {
2428 int ret;
2429
2430 switch (domain) {
2431 case LTTNG_DOMAIN_KERNEL:
2432 {
2433 struct ltt_kernel_session *ksess;
2434 struct ltt_kernel_channel *kchan;
2435
2436 ksess = session->kernel_session;
2437
2438 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2439 if (kchan == NULL) {
2440 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2441 goto error;
2442 }
2443
2444 ret = event_kernel_disable_all(ksess, kchan);
2445 if (ret != LTTCOMM_OK) {
2446 goto error;
2447 }
2448
2449 kernel_wait_quiescent(kernel_tracer_fd);
2450 break;
2451 }
2452 case LTTNG_DOMAIN_UST:
2453 {
2454 struct ltt_ust_session *usess;
2455 struct ltt_ust_channel *uchan;
2456
2457 usess = session->ust_session;
2458
2459 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2460 channel_name);
2461 if (uchan == NULL) {
2462 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2463 goto error;
2464 }
2465
2466 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2467 if (ret != 0) {
2468 goto error;
2469 }
2470
2471 DBG3("Disable all UST events in channel %s completed", channel_name);
2472
2473 break;
2474 }
2475 #if 0
2476 case LTTNG_DOMAIN_UST_EXEC_NAME:
2477 case LTTNG_DOMAIN_UST_PID:
2478 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2479 #endif
2480 default:
2481 ret = LTTCOMM_UND;
2482 goto error;
2483 }
2484
2485 ret = LTTCOMM_OK;
2486
2487 error:
2488 return ret;
2489 }
2490
2491 /*
2492 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2493 */
2494 static int cmd_add_context(struct ltt_session *session, int domain,
2495 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2496 {
2497 int ret;
2498
2499 switch (domain) {
2500 case LTTNG_DOMAIN_KERNEL:
2501 /* Add kernel context to kernel tracer */
2502 ret = context_kernel_add(session->kernel_session, ctx,
2503 event_name, channel_name);
2504 if (ret != LTTCOMM_OK) {
2505 goto error;
2506 }
2507 break;
2508 case LTTNG_DOMAIN_UST:
2509 {
2510 struct ltt_ust_session *usess = session->ust_session;
2511
2512 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2513 if (ret != LTTCOMM_OK) {
2514 goto error;
2515 }
2516 break;
2517 }
2518 #if 0
2519 case LTTNG_DOMAIN_UST_EXEC_NAME:
2520 case LTTNG_DOMAIN_UST_PID:
2521 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2522 #endif
2523 default:
2524 ret = LTTCOMM_UND;
2525 goto error;
2526 }
2527
2528 ret = LTTCOMM_OK;
2529
2530 error:
2531 return ret;
2532 }
2533
2534 /*
2535 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2536 */
2537 static int cmd_enable_event(struct ltt_session *session, int domain,
2538 char *channel_name, struct lttng_event *event)
2539 {
2540 int ret;
2541 struct lttng_channel *attr;
2542 struct ltt_ust_session *usess = session->ust_session;
2543
2544 switch (domain) {
2545 case LTTNG_DOMAIN_KERNEL:
2546 {
2547 struct ltt_kernel_channel *kchan;
2548
2549 kchan = trace_kernel_get_channel_by_name(channel_name,
2550 session->kernel_session);
2551 if (kchan == NULL) {
2552 attr = channel_new_default_attr(domain);
2553 if (attr == NULL) {
2554 ret = LTTCOMM_FATAL;
2555 goto error;
2556 }
2557 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2558
2559 /* This call will notify the kernel thread */
2560 ret = channel_kernel_create(session->kernel_session,
2561 attr, kernel_poll_pipe[1]);
2562 if (ret != LTTCOMM_OK) {
2563 free(attr);
2564 goto error;
2565 }
2566 free(attr);
2567 }
2568
2569 /* Get the newly created kernel channel pointer */
2570 kchan = trace_kernel_get_channel_by_name(channel_name,
2571 session->kernel_session);
2572 if (kchan == NULL) {
2573 /* This sould not happen... */
2574 ret = LTTCOMM_FATAL;
2575 goto error;
2576 }
2577
2578 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2579 event);
2580 if (ret != LTTCOMM_OK) {
2581 goto error;
2582 }
2583
2584 kernel_wait_quiescent(kernel_tracer_fd);
2585 break;
2586 }
2587 case LTTNG_DOMAIN_UST:
2588 {
2589 struct lttng_channel *attr;
2590 struct ltt_ust_channel *uchan;
2591
2592 /* Get channel from global UST domain */
2593 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2594 channel_name);
2595 if (uchan == NULL) {
2596 /* Create default channel */
2597 attr = channel_new_default_attr(domain);
2598 if (attr == NULL) {
2599 ret = LTTCOMM_FATAL;
2600 goto error;
2601 }
2602 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2603 attr->name[NAME_MAX - 1] = '\0';
2604
2605 ret = channel_ust_create(usess, domain, attr);
2606 if (ret != LTTCOMM_OK) {
2607 free(attr);
2608 goto error;
2609 }
2610 free(attr);
2611
2612 /* Get the newly created channel reference back */
2613 uchan = trace_ust_find_channel_by_name(
2614 usess->domain_global.channels, channel_name);
2615 if (uchan == NULL) {
2616 /* Something is really wrong */
2617 ret = LTTCOMM_FATAL;
2618 goto error;
2619 }
2620 }
2621
2622 /* At this point, the session and channel exist on the tracer */
2623 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2624 if (ret != LTTCOMM_OK) {
2625 goto error;
2626 }
2627 break;
2628 }
2629 #if 0
2630 case LTTNG_DOMAIN_UST_EXEC_NAME:
2631 case LTTNG_DOMAIN_UST_PID:
2632 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2633 #endif
2634 default:
2635 ret = LTTCOMM_UND;
2636 goto error;
2637 }
2638
2639 ret = LTTCOMM_OK;
2640
2641 error:
2642 return ret;
2643 }
2644
2645 /*
2646 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2647 */
2648 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2649 char *channel_name, int event_type)
2650 {
2651 int ret;
2652 struct ltt_kernel_channel *kchan;
2653
2654 switch (domain) {
2655 case LTTNG_DOMAIN_KERNEL:
2656 kchan = trace_kernel_get_channel_by_name(channel_name,
2657 session->kernel_session);
2658 if (kchan == NULL) {
2659 /* This call will notify the kernel thread */
2660 ret = channel_kernel_create(session->kernel_session, NULL,
2661 kernel_poll_pipe[1]);
2662 if (ret != LTTCOMM_OK) {
2663 goto error;
2664 }
2665
2666 /* Get the newly created kernel channel pointer */
2667 kchan = trace_kernel_get_channel_by_name(channel_name,
2668 session->kernel_session);
2669 if (kchan == NULL) {
2670 /* This sould not happen... */
2671 ret = LTTCOMM_FATAL;
2672 goto error;
2673 }
2674
2675 }
2676
2677 switch (event_type) {
2678 case LTTNG_EVENT_SYSCALL:
2679 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2680 kchan, kernel_tracer_fd);
2681 break;
2682 case LTTNG_EVENT_TRACEPOINT:
2683 /*
2684 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2685 * events already registered to the channel.
2686 */
2687 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2688 kchan, kernel_tracer_fd);
2689 break;
2690 case LTTNG_EVENT_ALL:
2691 /* Enable syscalls and tracepoints */
2692 ret = event_kernel_enable_all(session->kernel_session,
2693 kchan, kernel_tracer_fd);
2694 break;
2695 default:
2696 ret = LTTCOMM_KERN_ENABLE_FAIL;
2697 goto error;
2698 }
2699
2700 /* Manage return value */
2701 if (ret != LTTCOMM_OK) {
2702 goto error;
2703 }
2704
2705 kernel_wait_quiescent(kernel_tracer_fd);
2706 break;
2707 case LTTNG_DOMAIN_UST:
2708 {
2709 struct lttng_channel *attr;
2710 struct ltt_ust_channel *uchan;
2711 struct ltt_ust_session *usess = session->ust_session;
2712
2713 /* Get channel from global UST domain */
2714 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2715 channel_name);
2716 if (uchan == NULL) {
2717 /* Create default channel */
2718 attr = channel_new_default_attr(domain);
2719 if (attr == NULL) {
2720 ret = LTTCOMM_FATAL;
2721 goto error;
2722 }
2723 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2724 attr->name[NAME_MAX - 1] = '\0';
2725
2726 /* Use the internal command enable channel */
2727 ret = channel_ust_create(usess, domain, attr);
2728 if (ret != LTTCOMM_OK) {
2729 free(attr);
2730 goto error;
2731 }
2732 free(attr);
2733
2734 /* Get the newly created channel reference back */
2735 uchan = trace_ust_find_channel_by_name(
2736 usess->domain_global.channels, channel_name);
2737 if (uchan == NULL) {
2738 /* Something is really wrong */
2739 ret = LTTCOMM_FATAL;
2740 goto error;
2741 }
2742 }
2743
2744 /* At this point, the session and channel exist on the tracer */
2745
2746 switch (event_type) {
2747 case LTTNG_EVENT_ALL:
2748 case LTTNG_EVENT_TRACEPOINT:
2749 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2750 if (ret != LTTCOMM_OK) {
2751 goto error;
2752 }
2753 break;
2754 default:
2755 ret = LTTCOMM_UST_ENABLE_FAIL;
2756 goto error;
2757 }
2758
2759 /* Manage return value */
2760 if (ret != LTTCOMM_OK) {
2761 goto error;
2762 }
2763
2764 break;
2765 }
2766 #if 0
2767 case LTTNG_DOMAIN_UST_EXEC_NAME:
2768 case LTTNG_DOMAIN_UST_PID:
2769 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2770 #endif
2771 default:
2772 ret = LTTCOMM_UND;
2773 goto error;
2774 }
2775
2776 ret = LTTCOMM_OK;
2777
2778 error:
2779 return ret;
2780 }
2781
2782 /*
2783 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2784 */
2785 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2786 {
2787 int ret;
2788 ssize_t nb_events = 0;
2789
2790 switch (domain) {
2791 case LTTNG_DOMAIN_KERNEL:
2792 nb_events = kernel_list_events(kernel_tracer_fd, events);
2793 if (nb_events < 0) {
2794 ret = LTTCOMM_KERN_LIST_FAIL;
2795 goto error;
2796 }
2797 break;
2798 case LTTNG_DOMAIN_UST:
2799 nb_events = ust_app_list_events(events);
2800 if (nb_events < 0) {
2801 ret = LTTCOMM_UST_LIST_FAIL;
2802 goto error;
2803 }
2804 break;
2805 default:
2806 ret = LTTCOMM_UND;
2807 goto error;
2808 }
2809
2810 return nb_events;
2811
2812 error:
2813 /* Return negative value to differentiate return code */
2814 return -ret;
2815 }
2816
2817 /*
2818 * Command LTTNG_START_TRACE processed by the client thread.
2819 */
2820 static int cmd_start_trace(struct ltt_session *session)
2821 {
2822 int ret;
2823 struct ltt_kernel_session *ksession;
2824 struct ltt_ust_session *usess;
2825
2826 /* Short cut */
2827 ksession = session->kernel_session;
2828 usess = session->ust_session;
2829
2830 if (session->enabled) {
2831 ret = LTTCOMM_UST_START_FAIL;
2832 goto error;
2833 }
2834
2835 session->enabled = 1;
2836
2837 /* Kernel tracing */
2838 if (ksession != NULL) {
2839 struct ltt_kernel_channel *kchan;
2840
2841 /* Open kernel metadata */
2842 if (ksession->metadata == NULL) {
2843 ret = kernel_open_metadata(ksession, ksession->trace_path);
2844 if (ret < 0) {
2845 ret = LTTCOMM_KERN_META_FAIL;
2846 goto error;
2847 }
2848 }
2849
2850 /* Open kernel metadata stream */
2851 if (ksession->metadata_stream_fd == 0) {
2852 ret = kernel_open_metadata_stream(ksession);
2853 if (ret < 0) {
2854 ERR("Kernel create metadata stream failed");
2855 ret = LTTCOMM_KERN_STREAM_FAIL;
2856 goto error;
2857 }
2858 }
2859
2860 /* For each channel */
2861 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2862 if (kchan->stream_count == 0) {
2863 ret = kernel_open_channel_stream(kchan);
2864 if (ret < 0) {
2865 ret = LTTCOMM_KERN_STREAM_FAIL;
2866 goto error;
2867 }
2868 /* Update the stream global counter */
2869 ksession->stream_count_global += ret;
2870 }
2871 }
2872
2873 /* Setup kernel consumer socket and send fds to it */
2874 ret = init_kernel_tracing(ksession);
2875 if (ret < 0) {
2876 ret = LTTCOMM_KERN_START_FAIL;
2877 goto error;
2878 }
2879
2880 /* This start the kernel tracing */
2881 ret = kernel_start_session(ksession);
2882 if (ret < 0) {
2883 ret = LTTCOMM_KERN_START_FAIL;
2884 goto error;
2885 }
2886
2887 /* Quiescent wait after starting trace */
2888 kernel_wait_quiescent(kernel_tracer_fd);
2889 }
2890
2891 /* Flag session that trace should start automatically */
2892 if (usess) {
2893 usess->start_trace = 1;
2894
2895 ret = ust_app_start_trace_all(usess);
2896 if (ret < 0) {
2897 ret = LTTCOMM_UST_START_FAIL;
2898 goto error;
2899 }
2900 }
2901
2902 ret = LTTCOMM_OK;
2903
2904 error:
2905 return ret;
2906 }
2907
2908 /*
2909 * Command LTTNG_STOP_TRACE processed by the client thread.
2910 */
2911 static int cmd_stop_trace(struct ltt_session *session)
2912 {
2913 int ret;
2914 struct ltt_kernel_channel *kchan;
2915 struct ltt_kernel_session *ksession;
2916 struct ltt_ust_session *usess;
2917
2918 /* Short cut */
2919 ksession = session->kernel_session;
2920 usess = session->ust_session;
2921
2922 if (!session->enabled) {
2923 ret = LTTCOMM_UST_STOP_FAIL;
2924 goto error;
2925 }
2926
2927 session->enabled = 0;
2928
2929 /* Kernel tracer */
2930 if (ksession != NULL) {
2931 DBG("Stop kernel tracing");
2932
2933 /* Flush all buffers before stopping */
2934 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2935 if (ret < 0) {
2936 ERR("Kernel metadata flush failed");
2937 }
2938
2939 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2940 ret = kernel_flush_buffer(kchan);
2941 if (ret < 0) {
2942 ERR("Kernel flush buffer error");
2943 }
2944 }
2945
2946 ret = kernel_stop_session(ksession);
2947 if (ret < 0) {
2948 ret = LTTCOMM_KERN_STOP_FAIL;
2949 goto error;
2950 }
2951
2952 kernel_wait_quiescent(kernel_tracer_fd);
2953 }
2954
2955 if (usess) {
2956 usess->start_trace = 0;
2957
2958 ret = ust_app_stop_trace_all(usess);
2959 if (ret < 0) {
2960 ret = LTTCOMM_UST_STOP_FAIL;
2961 goto error;
2962 }
2963 }
2964
2965 ret = LTTCOMM_OK;
2966
2967 error:
2968 return ret;
2969 }
2970
2971 /*
2972 * Command LTTNG_CREATE_SESSION processed by the client thread.
2973 */
2974 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2975 {
2976 int ret;
2977
2978 ret = session_create(name, path, creds->uid, creds->gid);
2979 if (ret != LTTCOMM_OK) {
2980 goto error;
2981 }
2982
2983 ret = LTTCOMM_OK;
2984
2985 error:
2986 return ret;
2987 }
2988
2989 /*
2990 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2991 */
2992 static int cmd_destroy_session(struct ltt_session *session, char *name)
2993 {
2994 int ret;
2995
2996 /* Clean kernel session teardown */
2997 teardown_kernel_session(session);
2998 /* UST session teardown */
2999 teardown_ust_session(session);
3000
3001 /*
3002 * Must notify the kernel thread here to update it's poll setin order
3003 * to remove the channel(s)' fd just destroyed.
3004 */
3005 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3006 if (ret < 0) {
3007 perror("write kernel poll pipe");
3008 }
3009
3010 ret = session_destroy(session);
3011
3012 return ret;
3013 }
3014
3015 /*
3016 * Command LTTNG_CALIBRATE processed by the client thread.
3017 */
3018 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3019 {
3020 int ret;
3021
3022 switch (domain) {
3023 case LTTNG_DOMAIN_KERNEL:
3024 {
3025 struct lttng_kernel_calibrate kcalibrate;
3026
3027 kcalibrate.type = calibrate->type;
3028 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3029 if (ret < 0) {
3030 ret = LTTCOMM_KERN_ENABLE_FAIL;
3031 goto error;
3032 }
3033 break;
3034 }
3035 case LTTNG_DOMAIN_UST:
3036 {
3037 struct lttng_ust_calibrate ucalibrate;
3038
3039 ucalibrate.type = calibrate->type;
3040 ret = ust_app_calibrate_glb(&ucalibrate);
3041 if (ret < 0) {
3042 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3043 goto error;
3044 }
3045 break;
3046 }
3047 default:
3048 ret = LTTCOMM_UND;
3049 goto error;
3050 }
3051
3052 ret = LTTCOMM_OK;
3053
3054 error:
3055 return ret;
3056 }
3057
3058 /*
3059 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3060 */
3061 static int cmd_register_consumer(struct ltt_session *session, int domain,
3062 char *sock_path)
3063 {
3064 int ret, sock;
3065
3066 switch (domain) {
3067 case LTTNG_DOMAIN_KERNEL:
3068 /* Can't register a consumer if there is already one */
3069 if (session->kernel_session->consumer_fds_sent != 0) {
3070 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3071 goto error;
3072 }
3073
3074 sock = lttcomm_connect_unix_sock(sock_path);
3075 if (sock < 0) {
3076 ret = LTTCOMM_CONNECT_FAIL;
3077 goto error;
3078 }
3079
3080 session->kernel_session->consumer_fd = sock;
3081 break;
3082 default:
3083 /* TODO: Userspace tracing */
3084 ret = LTTCOMM_UND;
3085 goto error;
3086 }
3087
3088 ret = LTTCOMM_OK;
3089
3090 error:
3091 return ret;
3092 }
3093
3094 /*
3095 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3096 */
3097 static ssize_t cmd_list_domains(struct ltt_session *session,
3098 struct lttng_domain **domains)
3099 {
3100 int ret, index = 0;
3101 ssize_t nb_dom = 0;
3102
3103 if (session->kernel_session != NULL) {
3104 DBG3("Listing domains found kernel domain");
3105 nb_dom++;
3106 }
3107
3108 if (session->ust_session != NULL) {
3109 DBG3("Listing domains found UST global domain");
3110 nb_dom++;
3111 }
3112
3113 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3114 if (*domains == NULL) {
3115 ret = -LTTCOMM_FATAL;
3116 goto error;
3117 }
3118
3119 if (session->kernel_session != NULL) {
3120 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3121 index++;
3122 }
3123
3124 if (session->ust_session != NULL) {
3125 (*domains)[index].type = LTTNG_DOMAIN_UST;
3126 index++;
3127 }
3128
3129 return nb_dom;
3130
3131 error:
3132 return ret;
3133 }
3134
3135 /*
3136 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3137 */
3138 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3139 struct lttng_channel **channels)
3140 {
3141 int ret;
3142 ssize_t nb_chan = 0;
3143
3144 switch (domain) {
3145 case LTTNG_DOMAIN_KERNEL:
3146 if (session->kernel_session != NULL) {
3147 nb_chan = session->kernel_session->channel_count;
3148 }
3149 DBG3("Number of kernel channels %zd", nb_chan);
3150 break;
3151 case LTTNG_DOMAIN_UST:
3152 if (session->ust_session != NULL) {
3153 nb_chan = lttng_ht_get_count(
3154 session->ust_session->domain_global.channels);
3155 }
3156 DBG3("Number of UST global channels %zd", nb_chan);
3157 break;
3158 default:
3159 *channels = NULL;
3160 ret = -LTTCOMM_UND;
3161 goto error;
3162 }
3163
3164 if (nb_chan > 0) {
3165 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3166 if (*channels == NULL) {
3167 ret = -LTTCOMM_FATAL;
3168 goto error;
3169 }
3170
3171 list_lttng_channels(domain, session, *channels);
3172 } else {
3173 *channels = NULL;
3174 }
3175
3176 return nb_chan;
3177
3178 error:
3179 return ret;
3180 }
3181
3182 /*
3183 * Command LTTNG_LIST_EVENTS processed by the client thread.
3184 */
3185 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3186 char *channel_name, struct lttng_event **events)
3187 {
3188 int ret = 0;
3189 ssize_t nb_event = 0;
3190
3191 switch (domain) {
3192 case LTTNG_DOMAIN_KERNEL:
3193 if (session->kernel_session != NULL) {
3194 nb_event = list_lttng_kernel_events(channel_name,
3195 session->kernel_session, events);
3196 }
3197 break;
3198 case LTTNG_DOMAIN_UST:
3199 {
3200 if (session->ust_session != NULL) {
3201 nb_event = list_lttng_ust_global_events(channel_name,
3202 &session->ust_session->domain_global, events);
3203 }
3204 break;
3205 }
3206 default:
3207 ret = -LTTCOMM_UND;
3208 goto error;
3209 }
3210
3211 ret = nb_event;
3212
3213 error:
3214 return ret;
3215 }
3216
3217 /*
3218 * Process the command requested by the lttng client within the command
3219 * context structure. This function make sure that the return structure (llm)
3220 * is set and ready for transmission before returning.
3221 *
3222 * Return any error encountered or 0 for success.
3223 */
3224 static int process_client_msg(struct command_ctx *cmd_ctx)
3225 {
3226 int ret = LTTCOMM_OK;
3227 int need_tracing_session = 1;
3228 int need_domain;
3229
3230 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3231
3232 switch (cmd_ctx->lsm->cmd_type) {
3233 case LTTNG_CREATE_SESSION:
3234 case LTTNG_DESTROY_SESSION:
3235 case LTTNG_LIST_SESSIONS:
3236 case LTTNG_LIST_DOMAINS:
3237 case LTTNG_START_TRACE:
3238 case LTTNG_STOP_TRACE:
3239 need_domain = 0;
3240 break;
3241 default:
3242 need_domain = 1;
3243 }
3244
3245 if (opt_no_kernel && need_domain
3246 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3247 ret = LTTCOMM_KERN_NA;
3248 goto error;
3249 }
3250
3251 /*
3252 * Check for command that don't needs to allocate a returned payload. We do
3253 * this here so we don't have to make the call for no payload at each
3254 * command.
3255 */
3256 switch(cmd_ctx->lsm->cmd_type) {
3257 case LTTNG_LIST_SESSIONS:
3258 case LTTNG_LIST_TRACEPOINTS:
3259 case LTTNG_LIST_DOMAINS:
3260 case LTTNG_LIST_CHANNELS:
3261 case LTTNG_LIST_EVENTS:
3262 break;
3263 default:
3264 /* Setup lttng message with no payload */
3265 ret = setup_lttng_msg(cmd_ctx, 0);
3266 if (ret < 0) {
3267 /* This label does not try to unlock the session */
3268 goto init_setup_error;
3269 }
3270 }
3271
3272 /* Commands that DO NOT need a session. */
3273 switch (cmd_ctx->lsm->cmd_type) {
3274 case LTTNG_CREATE_SESSION:
3275 case LTTNG_CALIBRATE:
3276 case LTTNG_LIST_SESSIONS:
3277 case LTTNG_LIST_TRACEPOINTS:
3278 need_tracing_session = 0;
3279 break;
3280 default:
3281 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3282 session_lock_list();
3283 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3284 session_unlock_list();
3285 if (cmd_ctx->session == NULL) {
3286 if (cmd_ctx->lsm->session.name != NULL) {
3287 ret = LTTCOMM_SESS_NOT_FOUND;
3288 } else {
3289 /* If no session name specified */
3290 ret = LTTCOMM_SELECT_SESS;
3291 }
3292 goto error;
3293 } else {
3294 /* Acquire lock for the session */
3295 session_lock(cmd_ctx->session);
3296 }
3297 break;
3298 }
3299
3300 if (!need_domain) {
3301 goto skip_domain;
3302 }
3303 /*
3304 * Check domain type for specific "pre-action".
3305 */
3306 switch (cmd_ctx->lsm->domain.type) {
3307 case LTTNG_DOMAIN_KERNEL:
3308 if (!is_root) {
3309 ret = LTTCOMM_KERN_NA;
3310 goto error;
3311 }
3312
3313 /* Kernel tracer check */
3314 if (kernel_tracer_fd == 0) {
3315 /* Basically, load kernel tracer modules */
3316 ret = init_kernel_tracer();
3317 if (ret != 0) {
3318 goto error;
3319 }
3320 }
3321
3322 /* Need a session for kernel command */
3323 if (need_tracing_session) {
3324 if (cmd_ctx->session->kernel_session == NULL) {
3325 ret = create_kernel_session(cmd_ctx->session);
3326 if (ret < 0) {
3327 ret = LTTCOMM_KERN_SESS_FAIL;
3328 goto error;
3329 }
3330 }
3331
3332 /* Start the kernel consumer daemon */
3333 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3334 if (kconsumer_data.pid == 0 &&
3335 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3336 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3337 ret = start_consumerd(&kconsumer_data);
3338 if (ret < 0) {
3339 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3340 goto error;
3341 }
3342 } else {
3343 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3344 }
3345 }
3346 break;
3347 case LTTNG_DOMAIN_UST:
3348 {
3349 if (need_tracing_session) {
3350 if (cmd_ctx->session->ust_session == NULL) {
3351 ret = create_ust_session(cmd_ctx->session,
3352 &cmd_ctx->lsm->domain);
3353 if (ret != LTTCOMM_OK) {
3354 goto error;
3355 }
3356 }
3357 /* Start the UST consumer daemons */
3358 /* 64-bit */
3359 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3360 if (consumerd64_bin[0] != '\0' &&
3361 ustconsumer64_data.pid == 0 &&
3362 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3363 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3364 ret = start_consumerd(&ustconsumer64_data);
3365 if (ret < 0) {
3366 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3367 ust_consumerd64_fd = -EINVAL;
3368 goto error;
3369 }
3370
3371 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3372 } else {
3373 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3374 }
3375 /* 32-bit */
3376 if (consumerd32_bin[0] != '\0' &&
3377 ustconsumer32_data.pid == 0 &&
3378 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3379 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3380 ret = start_consumerd(&ustconsumer32_data);
3381 if (ret < 0) {
3382 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3383 ust_consumerd32_fd = -EINVAL;
3384 goto error;
3385 }
3386 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3387 } else {
3388 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3389 }
3390 }
3391 break;
3392 }
3393 default:
3394 break;
3395 }
3396 skip_domain:
3397
3398 /*
3399 * Check that the UID or GID match that of the tracing session.
3400 * The root user can interact with all sessions.
3401 */
3402 if (need_tracing_session) {
3403 if (!session_access_ok(cmd_ctx->session,
3404 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3405 ret = LTTCOMM_EPERM;
3406 goto error;
3407 }
3408 }
3409
3410 /* Process by command type */
3411 switch (cmd_ctx->lsm->cmd_type) {
3412 case LTTNG_ADD_CONTEXT:
3413 {
3414 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3415 cmd_ctx->lsm->u.context.channel_name,
3416 cmd_ctx->lsm->u.context.event_name,
3417 &cmd_ctx->lsm->u.context.ctx);
3418 break;
3419 }
3420 case LTTNG_DISABLE_CHANNEL:
3421 {
3422 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3423 cmd_ctx->lsm->u.disable.channel_name);
3424 break;
3425 }
3426 case LTTNG_DISABLE_EVENT:
3427 {
3428 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3429 cmd_ctx->lsm->u.disable.channel_name,
3430 cmd_ctx->lsm->u.disable.name);
3431 break;
3432 }
3433 case LTTNG_DISABLE_ALL_EVENT:
3434 {
3435 DBG("Disabling all events");
3436
3437 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3438 cmd_ctx->lsm->u.disable.channel_name);
3439 break;
3440 }
3441 case LTTNG_ENABLE_CHANNEL:
3442 {
3443 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3444 &cmd_ctx->lsm->u.channel.chan);
3445 break;
3446 }
3447 case LTTNG_ENABLE_EVENT:
3448 {
3449 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3450 cmd_ctx->lsm->u.enable.channel_name,
3451 &cmd_ctx->lsm->u.enable.event);
3452 break;
3453 }
3454 case LTTNG_ENABLE_ALL_EVENT:
3455 {
3456 DBG("Enabling all events");
3457
3458 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3459 cmd_ctx->lsm->u.enable.channel_name,
3460 cmd_ctx->lsm->u.enable.event.type);
3461 break;
3462 }
3463 case LTTNG_LIST_TRACEPOINTS:
3464 {
3465 struct lttng_event *events;
3466 ssize_t nb_events;
3467
3468 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3469 if (nb_events < 0) {
3470 ret = -nb_events;
3471 goto error;
3472 }
3473
3474 /*
3475 * Setup lttng message with payload size set to the event list size in
3476 * bytes and then copy list into the llm payload.
3477 */
3478 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3479 if (ret < 0) {
3480 free(events);
3481 goto setup_error;
3482 }
3483
3484 /* Copy event list into message payload */
3485 memcpy(cmd_ctx->llm->payload, events,
3486 sizeof(struct lttng_event) * nb_events);
3487
3488 free(events);
3489
3490 ret = LTTCOMM_OK;
3491 break;
3492 }
3493 case LTTNG_START_TRACE:
3494 {
3495 ret = cmd_start_trace(cmd_ctx->session);
3496 break;
3497 }
3498 case LTTNG_STOP_TRACE:
3499 {
3500 ret = cmd_stop_trace(cmd_ctx->session);
3501 break;
3502 }
3503 case LTTNG_CREATE_SESSION:
3504 {
3505 tracepoint(create_session_start);
3506 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3507 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3508 tracepoint(create_session_end);
3509 break;
3510 }
3511 case LTTNG_DESTROY_SESSION:
3512 {
3513 tracepoint(destroy_session_start);
3514 ret = cmd_destroy_session(cmd_ctx->session,
3515 cmd_ctx->lsm->session.name);
3516 tracepoint(destroy_session_end);
3517 break;
3518 }
3519 case LTTNG_LIST_DOMAINS:
3520 {
3521 ssize_t nb_dom;
3522 struct lttng_domain *domains;
3523
3524 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3525 if (nb_dom < 0) {
3526 ret = -nb_dom;
3527 goto error;
3528 }
3529
3530 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3531 if (ret < 0) {
3532 goto setup_error;
3533 }
3534
3535 /* Copy event list into message payload */
3536 memcpy(cmd_ctx->llm->payload, domains,
3537 nb_dom * sizeof(struct lttng_domain));
3538
3539 free(domains);
3540
3541 ret = LTTCOMM_OK;
3542 break;
3543 }
3544 case LTTNG_LIST_CHANNELS:
3545 {
3546 size_t nb_chan;
3547 struct lttng_channel *channels;
3548
3549 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3550 cmd_ctx->session, &channels);
3551 if (nb_chan < 0) {
3552 ret = -nb_chan;
3553 goto error;
3554 }
3555
3556 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3557 if (ret < 0) {
3558 goto setup_error;
3559 }
3560
3561 /* Copy event list into message payload */
3562 memcpy(cmd_ctx->llm->payload, channels,
3563 nb_chan * sizeof(struct lttng_channel));
3564
3565 free(channels);
3566
3567 ret = LTTCOMM_OK;
3568 break;
3569 }
3570 case LTTNG_LIST_EVENTS:
3571 {
3572 ssize_t nb_event;
3573 struct lttng_event *events = NULL;
3574
3575 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3576 cmd_ctx->lsm->u.list.channel_name, &events);
3577 if (nb_event < 0) {
3578 ret = -nb_event;
3579 goto error;
3580 }
3581
3582 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3583 if (ret < 0) {
3584 goto setup_error;
3585 }
3586
3587 /* Copy event list into message payload */
3588 memcpy(cmd_ctx->llm->payload, events,
3589 nb_event * sizeof(struct lttng_event));
3590
3591 free(events);
3592
3593 ret = LTTCOMM_OK;
3594 break;
3595 }
3596 case LTTNG_LIST_SESSIONS:
3597 {
3598 unsigned int nr_sessions;
3599
3600 session_lock_list();
3601 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3602
3603 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3604 if (ret < 0) {
3605 session_unlock_list();
3606 goto setup_error;
3607 }
3608
3609 /* Filled the session array */
3610 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3611 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3612
3613 session_unlock_list();
3614
3615 ret = LTTCOMM_OK;
3616 break;
3617 }
3618 case LTTNG_CALIBRATE:
3619 {
3620 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3621 &cmd_ctx->lsm->u.calibrate);
3622 break;
3623 }
3624 case LTTNG_REGISTER_CONSUMER:
3625 {
3626 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3627 cmd_ctx->lsm->u.reg.path);
3628 break;
3629 }
3630 default:
3631 ret = LTTCOMM_UND;
3632 break;
3633 }
3634
3635 error:
3636 if (cmd_ctx->llm == NULL) {
3637 DBG("Missing llm structure. Allocating one.");
3638 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3639 goto setup_error;
3640 }
3641 }
3642 /* Set return code */
3643 cmd_ctx->llm->ret_code = ret;
3644 setup_error:
3645 if (cmd_ctx->session) {
3646 session_unlock(cmd_ctx->session);
3647 }
3648 init_setup_error:
3649 return ret;
3650 }
3651
3652 /*
3653 * This thread manage all clients request using the unix client socket for
3654 * communication.
3655 */
3656 static void *thread_manage_clients(void *data)
3657 {
3658 int sock = 0, ret, i, pollfd;
3659 uint32_t revents, nb_fd;
3660 struct command_ctx *cmd_ctx = NULL;
3661 struct lttng_poll_event events;
3662
3663 tracepoint(sessiond_th_cli_start);
3664
3665 DBG("[thread] Manage client started");
3666
3667 rcu_register_thread();
3668
3669 ret = lttcomm_listen_unix_sock(client_sock);
3670 if (ret < 0) {
3671 goto error;
3672 }
3673
3674 /*
3675 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3676 * more will be added to this poll set.
3677 */
3678 ret = create_thread_poll_set(&events, 2);
3679 if (ret < 0) {
3680 goto error;
3681 }
3682
3683 /* Add the application registration socket */
3684 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3685 if (ret < 0) {
3686 goto error;
3687 }
3688
3689 /*
3690 * Notify parent pid that we are ready to accept command for client side.
3691 */
3692 if (opt_sig_parent) {
3693 kill(ppid, SIGUSR1);
3694 }
3695
3696 while (1) {
3697 DBG("Accepting client command ...");
3698
3699 tracepoint(sessiond_th_cli_poll);
3700
3701 nb_fd = LTTNG_POLL_GETNB(&events);
3702
3703 /* Inifinite blocking call, waiting for transmission */
3704 restart:
3705 ret = lttng_poll_wait(&events, -1);
3706 if (ret < 0) {
3707 /*
3708 * Restart interrupted system call.
3709 */
3710 if (errno == EINTR) {
3711 goto restart;
3712 }
3713 goto error;
3714 }
3715
3716 for (i = 0; i < nb_fd; i++) {
3717 /* Fetch once the poll data */
3718 revents = LTTNG_POLL_GETEV(&events, i);
3719 pollfd = LTTNG_POLL_GETFD(&events, i);
3720
3721 /* Thread quit pipe has been closed. Killing thread. */
3722 ret = check_thread_quit_pipe(pollfd, revents);
3723 if (ret) {
3724 goto error;
3725 }
3726
3727 /* Event on the registration socket */
3728 if (pollfd == client_sock) {
3729 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3730 ERR("Client socket poll error");
3731 goto error;
3732 }
3733 }
3734 }
3735
3736 DBG("Wait for client response");
3737
3738 sock = lttcomm_accept_unix_sock(client_sock);
3739 if (sock < 0) {
3740 goto error;
3741 }
3742
3743 /* Set socket option for credentials retrieval */
3744 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3745 if (ret < 0) {
3746 goto error;
3747 }
3748
3749 /* Allocate context command to process the client request */
3750 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3751 if (cmd_ctx == NULL) {
3752 perror("zmalloc cmd_ctx");
3753 goto error;
3754 }
3755
3756 /* Allocate data buffer for reception */
3757 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3758 if (cmd_ctx->lsm == NULL) {
3759 perror("zmalloc cmd_ctx->lsm");
3760 goto error;
3761 }
3762
3763 cmd_ctx->llm = NULL;
3764 cmd_ctx->session = NULL;
3765
3766 /*
3767 * Data is received from the lttng client. The struct
3768 * lttcomm_session_msg (lsm) contains the command and data request of
3769 * the client.
3770 */
3771 DBG("Receiving data from client ...");
3772 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3773 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3774 if (ret <= 0) {
3775 DBG("Nothing recv() from client... continuing");
3776 close(sock);
3777 free(cmd_ctx);
3778 continue;
3779 }
3780
3781 // TODO: Validate cmd_ctx including sanity check for
3782 // security purpose.
3783
3784 rcu_thread_online();
3785 /*
3786 * This function dispatch the work to the kernel or userspace tracer
3787 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3788 * informations for the client. The command context struct contains
3789 * everything this function may needs.
3790 */
3791 ret = process_client_msg(cmd_ctx);
3792 rcu_thread_offline();
3793 if (ret < 0) {
3794 /*
3795 * TODO: Inform client somehow of the fatal error. At
3796 * this point, ret < 0 means that a zmalloc failed
3797 * (ENOMEM). Error detected but still accept command.
3798 */
3799 clean_command_ctx(&cmd_ctx);
3800 continue;
3801 }
3802
3803 DBG("Sending response (size: %d, retcode: %s)",
3804 cmd_ctx->lttng_msg_size,
3805 lttng_strerror(-cmd_ctx->llm->ret_code));
3806 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3807 if (ret < 0) {
3808 ERR("Failed to send data back to client");
3809 }
3810
3811 /* End of transmission */
3812 close(sock);
3813
3814 clean_command_ctx(&cmd_ctx);
3815 }
3816
3817 error:
3818 DBG("Client thread dying");
3819 unlink(client_unix_sock_path);
3820 close(client_sock);
3821 close(sock);
3822
3823 lttng_poll_clean(&events);
3824 clean_command_ctx(&cmd_ctx);
3825
3826 rcu_unregister_thread();
3827 return NULL;
3828 }
3829
3830
3831 /*
3832 * usage function on stderr
3833 */
3834 static void usage(void)
3835 {
3836 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3837 fprintf(stderr, " -h, --help Display this usage.\n");
3838 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3839 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3840 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3841 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3842 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3843 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3844 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3845 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3846 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3847 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3848 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3849 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3850 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3851 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3852 fprintf(stderr, " -V, --version Show version number.\n");
3853 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3854 fprintf(stderr, " -q, --quiet No output at all.\n");
3855 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3856 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3857 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3858 }
3859
3860 /*
3861 * daemon argument parsing
3862 */
3863 static int parse_args(int argc, char **argv)
3864 {
3865 int c;
3866
3867 static struct option long_options[] = {
3868 { "client-sock", 1, 0, 'c' },
3869 { "apps-sock", 1, 0, 'a' },
3870 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3871 { "kconsumerd-err-sock", 1, 0, 'E' },
3872 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3873 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3874 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3875 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3876 { "consumerd32-path", 1, 0, 'u' },
3877 { "consumerd32-libdir", 1, 0, 'U' },
3878 { "consumerd64-path", 1, 0, 't' },
3879 { "consumerd64-libdir", 1, 0, 'T' },
3880 { "daemonize", 0, 0, 'd' },
3881 { "sig-parent", 0, 0, 'S' },
3882 { "help", 0, 0, 'h' },
3883 { "group", 1, 0, 'g' },
3884 { "version", 0, 0, 'V' },
3885 { "quiet", 0, 0, 'q' },
3886 { "verbose", 0, 0, 'v' },
3887 { "verbose-consumer", 0, 0, 'Z' },
3888 { "no-kernel", 0, 0, 'N' },
3889 { NULL, 0, 0, 0 }
3890 };
3891
3892 while (1) {
3893 int option_index = 0;
3894 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3895 long_options, &option_index);
3896 if (c == -1) {
3897 break;
3898 }
3899
3900 switch (c) {
3901 case 0:
3902 fprintf(stderr, "option %s", long_options[option_index].name);
3903 if (optarg) {
3904 fprintf(stderr, " with arg %s\n", optarg);
3905 }
3906 break;
3907 case 'c':
3908 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3909 break;
3910 case 'a':
3911 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3912 break;
3913 case 'd':
3914 opt_daemon = 1;
3915 break;
3916 case 'g':
3917 opt_tracing_group = optarg;
3918 break;
3919 case 'h':
3920 usage();
3921 exit(EXIT_FAILURE);
3922 case 'V':
3923 fprintf(stdout, "%s\n", VERSION);
3924 exit(EXIT_SUCCESS);
3925 case 'S':
3926 opt_sig_parent = 1;
3927 break;
3928 case 'E':
3929 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3930 break;
3931 case 'C':
3932 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3933 break;
3934 case 'F':
3935 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3936 break;
3937 case 'D':
3938 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3939 break;
3940 case 'H':
3941 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3942 break;
3943 case 'G':
3944 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3945 break;
3946 case 'N':
3947 opt_no_kernel = 1;
3948 break;
3949 case 'q':
3950 opt_quiet = 1;
3951 break;
3952 case 'v':
3953 /* Verbose level can increase using multiple -v */
3954 opt_verbose += 1;
3955 break;
3956 case 'Z':
3957 opt_verbose_consumer += 1;
3958 break;
3959 case 'u':
3960 consumerd32_bin= optarg;
3961 break;
3962 case 'U':
3963 consumerd32_libdir = optarg;
3964 break;
3965 case 't':
3966 consumerd64_bin = optarg;
3967 break;
3968 case 'T':
3969 consumerd64_libdir = optarg;
3970 break;
3971 default:
3972 /* Unknown option or other error.
3973 * Error is printed by getopt, just return */
3974 return -1;
3975 }
3976 }
3977
3978 return 0;
3979 }
3980
3981 /*
3982 * Creates the two needed socket by the daemon.
3983 * apps_sock - The communication socket for all UST apps.
3984 * client_sock - The communication of the cli tool (lttng).
3985 */
3986 static int init_daemon_socket(void)
3987 {
3988 int ret = 0;
3989 mode_t old_umask;
3990
3991 old_umask = umask(0);
3992
3993 /* Create client tool unix socket */
3994 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3995 if (client_sock < 0) {
3996 ERR("Create unix sock failed: %s", client_unix_sock_path);
3997 ret = -1;
3998 goto end;
3999 }
4000
4001 /* File permission MUST be 660 */
4002 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4003 if (ret < 0) {
4004 ERR("Set file permissions failed: %s", client_unix_sock_path);
4005 perror("chmod");
4006 goto end;
4007 }
4008
4009 /* Create the application unix socket */
4010 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4011 if (apps_sock < 0) {
4012 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4013 ret = -1;
4014 goto end;
4015 }
4016
4017 /* File permission MUST be 666 */
4018 ret = chmod(apps_unix_sock_path,
4019 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4020 if (ret < 0) {
4021 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4022 perror("chmod");
4023 goto end;
4024 }
4025
4026 end:
4027 umask(old_umask);
4028 return ret;
4029 }
4030
4031 /*
4032 * Check if the global socket is available, and if a daemon is answering at the
4033 * other side. If yes, error is returned.
4034 */
4035 static int check_existing_daemon(void)
4036 {
4037 /* Is there anybody out there ? */
4038 if (lttng_session_daemon_alive()) {
4039 return -EEXIST;
4040 }
4041
4042 return 0;
4043 }
4044
4045 /*
4046 * Set the tracing group gid onto the client socket.
4047 *
4048 * Race window between mkdir and chown is OK because we are going from more
4049 * permissive (root.root) to less permissive (root.tracing).
4050 */
4051 static int set_permissions(char *rundir)
4052 {
4053 int ret;
4054 gid_t gid;
4055
4056 gid = allowed_group();
4057 if (gid < 0) {
4058 WARN("No tracing group detected");
4059 ret = 0;
4060 goto end;
4061 }
4062
4063 /* Set lttng run dir */
4064 ret = chown(rundir, 0, gid);
4065 if (ret < 0) {
4066 ERR("Unable to set group on %s", rundir);
4067 perror("chown");
4068 }
4069
4070 /* Ensure tracing group can search the run dir */
4071 ret = chmod(rundir, S_IRWXU | S_IXGRP);
4072 if (ret < 0) {
4073 ERR("Unable to set permissions on %s", rundir);
4074 perror("chmod");
4075 }
4076
4077 /* lttng client socket path */
4078 ret = chown(client_unix_sock_path, 0, gid);
4079 if (ret < 0) {
4080 ERR("Unable to set group on %s", client_unix_sock_path);
4081 perror("chown");
4082 }
4083
4084 /* kconsumer error socket path */
4085 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4086 if (ret < 0) {
4087 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4088 perror("chown");
4089 }
4090
4091 /* 64-bit ustconsumer error socket path */
4092 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4093 if (ret < 0) {
4094 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4095 perror("chown");
4096 }
4097
4098 /* 32-bit ustconsumer compat32 error socket path */
4099 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4100 if (ret < 0) {
4101 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4102 perror("chown");
4103 }
4104
4105 DBG("All permissions are set");
4106
4107 end:
4108 return ret;
4109 }
4110
4111 /*
4112 * Create the pipe used to wake up the kernel thread.
4113 */
4114 static int create_kernel_poll_pipe(void)
4115 {
4116 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4117 }
4118
4119 /*
4120 * Create the application command pipe to wake thread_manage_apps.
4121 */
4122 static int create_apps_cmd_pipe(void)
4123 {
4124 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4125 }
4126
4127 /*
4128 * Create the lttng run directory needed for all global sockets and pipe.
4129 */
4130 static int create_lttng_rundir(const char *rundir)
4131 {
4132 int ret;
4133
4134 DBG3("Creating LTTng run directory: %s", rundir);
4135
4136 ret = mkdir(rundir, S_IRWXU);
4137 if (ret < 0) {
4138 if (errno != EEXIST) {
4139 ERR("Unable to create %s", rundir);
4140 goto error;
4141 } else {
4142 ret = 0;
4143 }
4144 }
4145
4146 error:
4147 return ret;
4148 }
4149
4150 /*
4151 * Setup sockets and directory needed by the kconsumerd communication with the
4152 * session daemon.
4153 */
4154 static int set_consumer_sockets(struct consumer_data *consumer_data,
4155 const char *rundir)
4156 {
4157 int ret;
4158 char path[PATH_MAX];
4159
4160 switch (consumer_data->type) {
4161 case LTTNG_CONSUMER_KERNEL:
4162 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4163 break;
4164 case LTTNG_CONSUMER64_UST:
4165 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4166 break;
4167 case LTTNG_CONSUMER32_UST:
4168 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4169 break;
4170 default:
4171 ERR("Consumer type unknown");
4172 ret = -EINVAL;
4173 goto error;
4174 }
4175
4176 DBG2("Creating consumer directory: %s", path);
4177
4178 ret = mkdir(path, S_IRWXU);
4179 if (ret < 0) {
4180 if (errno != EEXIST) {
4181 ERR("Failed to create %s", path);
4182 goto error;
4183 }
4184 ret = 0;
4185 }
4186
4187 /* Create the kconsumerd error unix socket */
4188 consumer_data->err_sock =
4189 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4190 if (consumer_data->err_sock < 0) {
4191 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4192 ret = -1;
4193 goto error;
4194 }
4195
4196 /* File permission MUST be 660 */
4197 ret = chmod(consumer_data->err_unix_sock_path,
4198 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4199 if (ret < 0) {
4200 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4201 PERROR("chmod");
4202 goto error;
4203 }
4204
4205 error:
4206 return ret;
4207 }
4208
4209 /*
4210 * Signal handler for the daemon
4211 *
4212 * Simply stop all worker threads, leaving main() return gracefully after
4213 * joining all threads and calling cleanup().
4214 */
4215 static void sighandler(int sig)
4216 {
4217 switch (sig) {
4218 case SIGPIPE:
4219 DBG("SIGPIPE caught");
4220 return;
4221 case SIGINT:
4222 DBG("SIGINT caught");
4223 stop_threads();
4224 break;
4225 case SIGTERM:
4226 DBG("SIGTERM caught");
4227 stop_threads();
4228 break;
4229 default:
4230 break;
4231 }
4232 }
4233
4234 /*
4235 * Setup signal handler for :
4236 * SIGINT, SIGTERM, SIGPIPE
4237 */
4238 static int set_signal_handler(void)
4239 {
4240 int ret = 0;
4241 struct sigaction sa;
4242 sigset_t sigset;
4243
4244 if ((ret = sigemptyset(&sigset)) < 0) {
4245 perror("sigemptyset");
4246 return ret;
4247 }
4248
4249 sa.sa_handler = sighandler;
4250 sa.sa_mask = sigset;
4251 sa.sa_flags = 0;
4252 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4253 perror("sigaction");
4254 return ret;
4255 }
4256
4257 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4258 perror("sigaction");
4259 return ret;
4260 }
4261
4262 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4263 perror("sigaction");
4264 return ret;
4265 }
4266
4267 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4268
4269 return ret;
4270 }
4271
4272 /*
4273 * Set open files limit to unlimited. This daemon can open a large number of
4274 * file descriptors in order to consumer multiple kernel traces.
4275 */
4276 static void set_ulimit(void)
4277 {
4278 int ret;
4279 struct rlimit lim;
4280
4281 /* The kernel does not allowed an infinite limit for open files */
4282 lim.rlim_cur = 65535;
4283 lim.rlim_max = 65535;
4284
4285 ret = setrlimit(RLIMIT_NOFILE, &lim);
4286 if (ret < 0) {
4287 perror("failed to set open files limit");
4288 }
4289 }
4290
4291 /*
4292 * main
4293 */
4294 int main(int argc, char **argv)
4295 {
4296 int ret = 0;
4297 void *status;
4298 const char *home_path;
4299
4300 tracepoint(sessiond_boot_start);
4301
4302 init_kernel_workarounds();
4303
4304 rcu_register_thread();
4305
4306 /* Create thread quit pipe */
4307 if ((ret = init_thread_quit_pipe()) < 0) {
4308 goto error;
4309 }
4310
4311 setup_consumerd_path();
4312
4313 /* Parse arguments */
4314 progname = argv[0];
4315 if ((ret = parse_args(argc, argv) < 0)) {
4316 goto error;
4317 }
4318
4319 /* Daemonize */
4320 if (opt_daemon) {
4321 ret = daemon(0, 0);
4322 if (ret < 0) {
4323 perror("daemon");
4324 goto error;
4325 }
4326 }
4327
4328 /* Check if daemon is UID = 0 */
4329 is_root = !getuid();
4330
4331 if (is_root) {
4332 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4333
4334 /* Create global run dir with root access */
4335 ret = create_lttng_rundir(rundir);
4336 if (ret < 0) {
4337 goto error;
4338 }
4339
4340 if (strlen(apps_unix_sock_path) == 0) {
4341 snprintf(apps_unix_sock_path, PATH_MAX,
4342 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4343 }
4344
4345 if (strlen(client_unix_sock_path) == 0) {
4346 snprintf(client_unix_sock_path, PATH_MAX,
4347 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4348 }
4349
4350 /* Set global SHM for ust */
4351 if (strlen(wait_shm_path) == 0) {
4352 snprintf(wait_shm_path, PATH_MAX,
4353 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4354 }
4355
4356 /* Setup kernel consumerd path */
4357 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4358 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4359 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4360 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4361
4362 DBG2("Kernel consumer err path: %s",
4363 kconsumer_data.err_unix_sock_path);
4364 DBG2("Kernel consumer cmd path: %s",
4365 kconsumer_data.cmd_unix_sock_path);
4366 } else {
4367 home_path = get_home_dir();
4368 if (home_path == NULL) {
4369 /* TODO: Add --socket PATH option */
4370 ERR("Can't get HOME directory for sockets creation.");
4371 ret = -EPERM;
4372 goto error;
4373 }
4374
4375 /*
4376 * Create rundir from home path. This will create something like
4377 * $HOME/.lttng
4378 */
4379 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4380 if (ret < 0) {
4381 ret = -ENOMEM;
4382 goto error;
4383 }
4384
4385 ret = create_lttng_rundir(rundir);
4386 if (ret < 0) {
4387 goto error;
4388 }
4389
4390 if (strlen(apps_unix_sock_path) == 0) {
4391 snprintf(apps_unix_sock_path, PATH_MAX,
4392 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4393 }
4394
4395 /* Set the cli tool unix socket path */
4396 if (strlen(client_unix_sock_path) == 0) {
4397 snprintf(client_unix_sock_path, PATH_MAX,
4398 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4399 }
4400
4401 /* Set global SHM for ust */
4402 if (strlen(wait_shm_path) == 0) {
4403 snprintf(wait_shm_path, PATH_MAX,
4404 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4405 }
4406 }
4407
4408 DBG("Client socket path %s", client_unix_sock_path);
4409 DBG("Application socket path %s", apps_unix_sock_path);
4410 DBG("LTTng run directory path: %s", rundir);
4411
4412 /* 32 bits consumerd path setup */
4413 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4414 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4415 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4416 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4417
4418 DBG2("UST consumer 32 bits err path: %s",
4419 ustconsumer32_data.err_unix_sock_path);
4420 DBG2("UST consumer 32 bits cmd path: %s",
4421 ustconsumer32_data.cmd_unix_sock_path);
4422
4423 /* 64 bits consumerd path setup */
4424 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4425 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4426 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4427 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4428
4429 DBG2("UST consumer 64 bits err path: %s",
4430 ustconsumer64_data.err_unix_sock_path);
4431 DBG2("UST consumer 64 bits cmd path: %s",
4432 ustconsumer64_data.cmd_unix_sock_path);
4433
4434 /*
4435 * See if daemon already exist.
4436 */
4437 if ((ret = check_existing_daemon()) < 0) {
4438 ERR("Already running daemon.\n");
4439 /*
4440 * We do not goto exit because we must not cleanup()
4441 * because a daemon is already running.
4442 */
4443 goto error;
4444 }
4445
4446 /* After this point, we can safely call cleanup() with "goto exit" */
4447
4448 /*
4449 * These actions must be executed as root. We do that *after* setting up
4450 * the sockets path because we MUST make the check for another daemon using
4451 * those paths *before* trying to set the kernel consumer sockets and init
4452 * kernel tracer.
4453 */
4454 if (is_root) {
4455 ret = set_consumer_sockets(&kconsumer_data, rundir);
4456 if (ret < 0) {
4457 goto exit;
4458 }
4459
4460 /* Setup kernel tracer */
4461 if (!opt_no_kernel) {
4462 init_kernel_tracer();
4463 }
4464
4465 /* Set ulimit for open files */
4466 set_ulimit();
4467 }
4468
4469 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4470 if (ret < 0) {
4471 goto exit;
4472 }
4473
4474 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4475 if (ret < 0) {
4476 goto exit;
4477 }
4478
4479 if ((ret = set_signal_handler()) < 0) {
4480 goto exit;
4481 }
4482
4483 /* Setup the needed unix socket */
4484 if ((ret = init_daemon_socket()) < 0) {
4485 goto exit;
4486 }
4487
4488 /* Set credentials to socket */
4489 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4490 goto exit;
4491 }
4492
4493 /* Get parent pid if -S, --sig-parent is specified. */
4494 if (opt_sig_parent) {
4495 ppid = getppid();
4496 }
4497
4498 /* Setup the kernel pipe for waking up the kernel thread */
4499 if ((ret = create_kernel_poll_pipe()) < 0) {
4500 goto exit;
4501 }
4502
4503 /* Setup the thread apps communication pipe. */
4504 if ((ret = create_apps_cmd_pipe()) < 0) {
4505 goto exit;
4506 }
4507
4508 /* Init UST command queue. */
4509 cds_wfq_init(&ust_cmd_queue.queue);
4510
4511 /* Init UST app hash table */
4512 ust_app_ht_alloc();
4513
4514 /*
4515 * Get session list pointer. This pointer MUST NOT be free(). This list is
4516 * statically declared in session.c
4517 */
4518 session_list_ptr = session_get_list();
4519
4520 /* Set up max poll set size */
4521 lttng_poll_set_max_size();
4522
4523 /* Create thread to manage the client socket */
4524 ret = pthread_create(&client_thread, NULL,
4525 thread_manage_clients, (void *) NULL);
4526 if (ret != 0) {
4527 perror("pthread_create clients");
4528 goto exit_client;
4529 }
4530
4531 /* Create thread to dispatch registration */
4532 ret = pthread_create(&dispatch_thread, NULL,
4533 thread_dispatch_ust_registration, (void *) NULL);
4534 if (ret != 0) {
4535 perror("pthread_create dispatch");
4536 goto exit_dispatch;
4537 }
4538
4539 /* Create thread to manage application registration. */
4540 ret = pthread_create(&reg_apps_thread, NULL,
4541 thread_registration_apps, (void *) NULL);
4542 if (ret != 0) {
4543 perror("pthread_create registration");
4544 goto exit_reg_apps;
4545 }
4546
4547 /* Create thread to manage application socket */
4548 ret = pthread_create(&apps_thread, NULL,
4549 thread_manage_apps, (void *) NULL);
4550 if (ret != 0) {
4551 perror("pthread_create apps");
4552 goto exit_apps;
4553 }
4554
4555 /* Create kernel thread to manage kernel event */
4556 ret = pthread_create(&kernel_thread, NULL,
4557 thread_manage_kernel, (void *) NULL);
4558 if (ret != 0) {
4559 perror("pthread_create kernel");
4560 goto exit_kernel;
4561 }
4562
4563 tracepoint(sessiond_boot_end);
4564
4565 ret = pthread_join(kernel_thread, &status);
4566 if (ret != 0) {
4567 perror("pthread_join");
4568 goto error; /* join error, exit without cleanup */
4569 }
4570
4571 exit_kernel:
4572 ret = pthread_join(apps_thread, &status);
4573 if (ret != 0) {
4574 perror("pthread_join");
4575 goto error; /* join error, exit without cleanup */
4576 }
4577
4578 exit_apps:
4579 ret = pthread_join(reg_apps_thread, &status);
4580 if (ret != 0) {
4581 perror("pthread_join");
4582 goto error; /* join error, exit without cleanup */
4583 }
4584
4585 exit_reg_apps:
4586 ret = pthread_join(dispatch_thread, &status);
4587 if (ret != 0) {
4588 perror("pthread_join");
4589 goto error; /* join error, exit without cleanup */
4590 }
4591
4592 exit_dispatch:
4593 ret = pthread_join(client_thread, &status);
4594 if (ret != 0) {
4595 perror("pthread_join");
4596 goto error; /* join error, exit without cleanup */
4597 }
4598
4599 ret = join_consumer_thread(&kconsumer_data);
4600 if (ret != 0) {
4601 perror("join_consumer");
4602 goto error; /* join error, exit without cleanup */
4603 }
4604
4605 exit_client:
4606 exit:
4607 /*
4608 * cleanup() is called when no other thread is running.
4609 */
4610 rcu_thread_online();
4611 cleanup();
4612 rcu_thread_offline();
4613 rcu_unregister_thread();
4614 if (!ret) {
4615 exit(EXIT_SUCCESS);
4616 }
4617 error:
4618 exit(EXIT_FAILURE);
4619 }
LTTng 2.0 tools and control repository
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