Revert FreeBSD compatibility layer
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearing down session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearing down session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all sessions");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
425 }
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
429
430 /* <fun> */
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
435 }
436
437 /*
438 * Send data on a unix socket using the liblttsessiondcomm API.
439 *
440 * Return lttcomm error code.
441 */
442 static int send_unix_sock(int sock, void *buf, size_t len)
443 {
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450 }
451
452 /*
453 * Free memory of a command context structure.
454 */
455 static void clean_command_ctx(struct command_ctx **cmd_ctx)
456 {
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
461 }
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
464 }
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
467 }
468 }
469
470 /*
471 * Send all stream fds of kernel channel to the consumer.
472 */
473 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
476 {
477 int ret;
478 struct ltt_kernel_stream *stream;
479 struct lttcomm_consumer_msg lkm;
480
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel->channel->name);
483
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
491 if (ret < 0) {
492 perror("send consumer channel");
493 goto error;
494 }
495
496 /* Send streams */
497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
521 }
522 }
523
524 DBG("consumer channel streams sent");
525
526 return 0;
527
528 error:
529 return ret;
530 }
531
532 /*
533 * Send all stream fds of the kernel session to the consumer.
534 */
535 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
536 struct ltt_kernel_session *session)
537 {
538 int ret;
539 struct ltt_kernel_channel *chan;
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
542
543 DBG("Sending metadata stream fd");
544
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session->consumer_fd == 0) {
547 session->consumer_fd = consumer_data->cmd_sock;
548 }
549
550 if (session->metadata_stream_fd != 0) {
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
581 if (ret < 0) {
582 perror("send consumer stream");
583 goto error;
584 }
585 }
586
587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599 error:
600 return ret;
601 }
602
603 /*
604 * Notify UST applications using the shm mmap futex.
605 */
606 static int notify_ust_apps(int active)
607 {
608 char *wait_shm_mmap;
609
610 DBG("Notifying applications of session daemon state: %d", active);
611
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
615 goto error;
616 }
617
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
623
624 error:
625 return -1;
626 }
627
628 /*
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
632 *
633 * Return total size of the buffer pointed by buf.
634 */
635 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
636 {
637 int ret, buf_size;
638
639 buf_size = size;
640
641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
642 if (cmd_ctx->llm == NULL) {
643 perror("zmalloc");
644 ret = -ENOMEM;
645 goto error;
646 }
647
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
651
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
655 return buf_size;
656
657 error:
658 return ret;
659 }
660
661 /*
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
664 */
665 static int update_kernel_poll(struct lttng_poll_event *events)
666 {
667 int ret;
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
671 DBG("Updating kernel poll set");
672
673 session_lock_list();
674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
675 session_lock(session);
676 if (session->kernel_session == NULL) {
677 session_unlock(session);
678 continue;
679 }
680
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
686 session_unlock(session);
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
690 }
691 session_unlock(session);
692 }
693 session_unlock_list();
694
695 return 0;
696
697 error:
698 session_unlock_list();
699 return -1;
700 }
701
702 /*
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
705 *
706 * Useful for CPU hotplug feature.
707 */
708 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
709 {
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
716 session_lock_list();
717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
718 session_lock(session);
719 if (session->kernel_session == NULL) {
720 session_unlock(session);
721 continue;
722 }
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
735 goto error;
736 }
737
738 /*
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
742 */
743 if (session->kernel_session->consumer_fds_sent == 1) {
744 ret = send_kconsumer_channel_streams(consumer_data,
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
747 if (ret < 0) {
748 goto error;
749 }
750 }
751 goto error;
752 }
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757 return ret;
758
759 error:
760 session_unlock(session);
761 session_unlock_list();
762 return ret;
763 }
764
765 /*
766 * For each tracing session, update newly registered apps.
767 */
768 static void update_ust_app(int app_sock)
769 {
770 struct ltt_session *sess, *stmp;
771
772 session_lock_list();
773
774 /* For all tracing session(s) */
775 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
776 session_lock(sess);
777 if (sess->ust_session) {
778 ust_app_global_update(sess->ust_session, app_sock);
779 }
780 session_unlock(sess);
781 }
782
783 session_unlock_list();
784 }
785
786 /*
787 * This thread manage event coming from the kernel.
788 *
789 * Features supported in this thread:
790 * -) CPU Hotplug
791 */
792 static void *thread_manage_kernel(void *data)
793 {
794 int ret, i, pollfd, update_poll_flag = 1;
795 uint32_t revents, nb_fd;
796 char tmp;
797 struct lttng_poll_event events;
798
799 DBG("Thread manage kernel started");
800
801 ret = create_thread_poll_set(&events, 2);
802 if (ret < 0) {
803 goto error;
804 }
805
806 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
807 if (ret < 0) {
808 goto error;
809 }
810
811 while (1) {
812 if (update_poll_flag == 1) {
813 /*
814 * Reset number of fd in the poll set. Always 2 since there is the thread
815 * quit pipe and the kernel pipe.
816 */
817 events.nb_fd = 2;
818
819 ret = update_kernel_poll(&events);
820 if (ret < 0) {
821 goto error;
822 }
823 update_poll_flag = 0;
824 }
825
826 nb_fd = LTTNG_POLL_GETNB(&events);
827
828 DBG("Thread kernel polling on %d fds", nb_fd);
829
830 /* Zeroed the poll events */
831 lttng_poll_reset(&events);
832
833 /* Poll infinite value of time */
834 ret = lttng_poll_wait(&events, -1);
835 if (ret < 0) {
836 goto error;
837 } else if (ret == 0) {
838 /* Should not happen since timeout is infinite */
839 ERR("Return value of poll is 0 with an infinite timeout.\n"
840 "This should not have happened! Continuing...");
841 continue;
842 }
843
844 for (i = 0; i < nb_fd; i++) {
845 /* Fetch once the poll data */
846 revents = LTTNG_POLL_GETEV(&events, i);
847 pollfd = LTTNG_POLL_GETFD(&events, i);
848
849 /* Thread quit pipe has been closed. Killing thread. */
850 ret = check_thread_quit_pipe(pollfd, revents);
851 if (ret) {
852 goto error;
853 }
854
855 /* Check for data on kernel pipe */
856 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
857 ret = read(kernel_poll_pipe[0], &tmp, 1);
858 update_poll_flag = 1;
859 continue;
860 } else {
861 /*
862 * New CPU detected by the kernel. Adding kernel stream to
863 * kernel session and updating the kernel consumer
864 */
865 if (revents & LPOLLIN) {
866 ret = update_kernel_stream(&kconsumer_data, pollfd);
867 if (ret < 0) {
868 continue;
869 }
870 break;
871 /*
872 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
873 * and unregister kernel stream at this point.
874 */
875 }
876 }
877 }
878 }
879
880 error:
881 DBG("Kernel thread dying");
882 close(kernel_poll_pipe[0]);
883 close(kernel_poll_pipe[1]);
884
885 lttng_poll_clean(&events);
886
887 return NULL;
888 }
889
890 /*
891 * This thread manage the consumer error sent back to the session daemon.
892 */
893 static void *thread_manage_consumer(void *data)
894 {
895 int sock = 0, i, ret, pollfd;
896 uint32_t revents, nb_fd;
897 enum lttcomm_return_code code;
898 struct lttng_poll_event events;
899 struct consumer_data *consumer_data = data;
900
901 DBG("[thread] Manage consumer started");
902
903 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
904 if (ret < 0) {
905 goto error;
906 }
907
908 /*
909 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
910 * Nothing more will be added to this poll set.
911 */
912 ret = create_thread_poll_set(&events, 2);
913 if (ret < 0) {
914 goto error;
915 }
916
917 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
918 if (ret < 0) {
919 goto error;
920 }
921
922 nb_fd = LTTNG_POLL_GETNB(&events);
923
924 /* Inifinite blocking call, waiting for transmission */
925 ret = lttng_poll_wait(&events, -1);
926 if (ret < 0) {
927 goto error;
928 }
929
930 for (i = 0; i < nb_fd; i++) {
931 /* Fetch once the poll data */
932 revents = LTTNG_POLL_GETEV(&events, i);
933 pollfd = LTTNG_POLL_GETFD(&events, i);
934
935 /* Thread quit pipe has been closed. Killing thread. */
936 ret = check_thread_quit_pipe(pollfd, revents);
937 if (ret) {
938 goto error;
939 }
940
941 /* Event on the registration socket */
942 if (pollfd == consumer_data->err_sock) {
943 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
944 ERR("consumer err socket poll error");
945 goto error;
946 }
947 }
948 }
949
950 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
951 if (sock < 0) {
952 goto error;
953 }
954
955 DBG2("Receiving code from consumer err_sock");
956
957 /* Getting status code from kconsumerd */
958 ret = lttcomm_recv_unix_sock(sock, &code,
959 sizeof(enum lttcomm_return_code));
960 if (ret <= 0) {
961 goto error;
962 }
963
964 if (code == CONSUMERD_COMMAND_SOCK_READY) {
965 consumer_data->cmd_sock =
966 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
967 if (consumer_data->cmd_sock < 0) {
968 sem_post(&consumer_data->sem);
969 PERROR("consumer connect");
970 goto error;
971 }
972 /* Signal condition to tell that the kconsumerd is ready */
973 sem_post(&consumer_data->sem);
974 DBG("consumer command socket ready");
975 } else {
976 ERR("consumer error when waiting for SOCK_READY : %s",
977 lttcomm_get_readable_code(-code));
978 goto error;
979 }
980
981 /* Remove the kconsumerd error sock since we've established a connexion */
982 ret = lttng_poll_del(&events, consumer_data->err_sock);
983 if (ret < 0) {
984 goto error;
985 }
986
987 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
988 if (ret < 0) {
989 goto error;
990 }
991
992 /* Update number of fd */
993 nb_fd = LTTNG_POLL_GETNB(&events);
994
995 /* Inifinite blocking call, waiting for transmission */
996 ret = lttng_poll_wait(&events, -1);
997 if (ret < 0) {
998 goto error;
999 }
1000
1001 for (i = 0; i < nb_fd; i++) {
1002 /* Fetch once the poll data */
1003 revents = LTTNG_POLL_GETEV(&events, i);
1004 pollfd = LTTNG_POLL_GETFD(&events, i);
1005
1006 /* Thread quit pipe has been closed. Killing thread. */
1007 ret = check_thread_quit_pipe(pollfd, revents);
1008 if (ret) {
1009 goto error;
1010 }
1011
1012 /* Event on the kconsumerd socket */
1013 if (pollfd == sock) {
1014 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1015 ERR("consumer err socket second poll error");
1016 goto error;
1017 }
1018 }
1019 }
1020
1021 /* Wait for any kconsumerd error */
1022 ret = lttcomm_recv_unix_sock(sock, &code,
1023 sizeof(enum lttcomm_return_code));
1024 if (ret <= 0) {
1025 ERR("consumer closed the command socket");
1026 goto error;
1027 }
1028
1029 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1030
1031 error:
1032 DBG("consumer thread dying");
1033 close(consumer_data->err_sock);
1034 close(consumer_data->cmd_sock);
1035 close(sock);
1036
1037 unlink(consumer_data->err_unix_sock_path);
1038 unlink(consumer_data->cmd_unix_sock_path);
1039 consumer_data->pid = 0;
1040
1041 lttng_poll_clean(&events);
1042
1043 return NULL;
1044 }
1045
1046 /*
1047 * This thread manage application communication.
1048 */
1049 static void *thread_manage_apps(void *data)
1050 {
1051 int i, ret, pollfd;
1052 uint32_t revents, nb_fd;
1053 struct ust_command ust_cmd;
1054 struct lttng_poll_event events;
1055
1056 DBG("[thread] Manage application started");
1057
1058 rcu_register_thread();
1059 rcu_thread_online();
1060
1061 ret = create_thread_poll_set(&events, 2);
1062 if (ret < 0) {
1063 goto error;
1064 }
1065
1066 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1067 if (ret < 0) {
1068 goto error;
1069 }
1070
1071 while (1) {
1072 /* Zeroed the events structure */
1073 lttng_poll_reset(&events);
1074
1075 nb_fd = LTTNG_POLL_GETNB(&events);
1076
1077 DBG("Apps thread polling on %d fds", nb_fd);
1078
1079 /* Inifinite blocking call, waiting for transmission */
1080 ret = lttng_poll_wait(&events, -1);
1081 if (ret < 0) {
1082 goto error;
1083 }
1084
1085 for (i = 0; i < nb_fd; i++) {
1086 /* Fetch once the poll data */
1087 revents = LTTNG_POLL_GETEV(&events, i);
1088 pollfd = LTTNG_POLL_GETFD(&events, i);
1089
1090 /* Thread quit pipe has been closed. Killing thread. */
1091 ret = check_thread_quit_pipe(pollfd, revents);
1092 if (ret) {
1093 goto error;
1094 }
1095
1096 /* Inspect the apps cmd pipe */
1097 if (pollfd == apps_cmd_pipe[0]) {
1098 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1099 ERR("Apps command pipe error");
1100 goto error;
1101 } else if (revents & LPOLLIN) {
1102 /* Empty pipe */
1103 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1104 if (ret < 0 || ret < sizeof(ust_cmd)) {
1105 perror("read apps cmd pipe");
1106 goto error;
1107 }
1108
1109 /* Register applicaton to the session daemon */
1110 ret = ust_app_register(&ust_cmd.reg_msg,
1111 ust_cmd.sock);
1112 if (ret == -ENOMEM) {
1113 goto error;
1114 } else if (ret < 0) {
1115 break;
1116 }
1117
1118 /*
1119 * Validate UST version compatibility.
1120 */
1121 ret = ust_app_validate_version(ust_cmd.sock);
1122 if (ret >= 0) {
1123 /*
1124 * Add channel(s) and event(s) to newly registered apps
1125 * from lttng global UST domain.
1126 */
1127 update_ust_app(ust_cmd.sock);
1128 }
1129
1130 ret = ust_app_register_done(ust_cmd.sock);
1131 if (ret < 0) {
1132 /*
1133 * If the registration is not possible, we simply
1134 * unregister the apps and continue
1135 */
1136 ust_app_unregister(ust_cmd.sock);
1137 } else {
1138 /*
1139 * We just need here to monitor the close of the UST
1140 * socket and poll set monitor those by default.
1141 */
1142 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1143 if (ret < 0) {
1144 goto error;
1145 }
1146
1147 DBG("Apps with sock %d added to poll set",
1148 ust_cmd.sock);
1149 }
1150
1151 break;
1152 }
1153 } else {
1154 /*
1155 * At this point, we know that a registered application made
1156 * the event at poll_wait.
1157 */
1158 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1159 /* Removing from the poll set */
1160 ret = lttng_poll_del(&events, pollfd);
1161 if (ret < 0) {
1162 goto error;
1163 }
1164
1165 /* Socket closed on remote end. */
1166 ust_app_unregister(pollfd);
1167 break;
1168 }
1169 }
1170 }
1171 }
1172
1173 error:
1174 DBG("Application communication apps dying");
1175 close(apps_cmd_pipe[0]);
1176 close(apps_cmd_pipe[1]);
1177
1178 lttng_poll_clean(&events);
1179
1180 rcu_thread_offline();
1181 rcu_unregister_thread();
1182 return NULL;
1183 }
1184
1185 /*
1186 * Dispatch request from the registration threads to the application
1187 * communication thread.
1188 */
1189 static void *thread_dispatch_ust_registration(void *data)
1190 {
1191 int ret;
1192 struct cds_wfq_node *node;
1193 struct ust_command *ust_cmd = NULL;
1194
1195 DBG("[thread] Dispatch UST command started");
1196
1197 while (!dispatch_thread_exit) {
1198 /* Atomically prepare the queue futex */
1199 futex_nto1_prepare(&ust_cmd_queue.futex);
1200
1201 do {
1202 /* Dequeue command for registration */
1203 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1204 if (node == NULL) {
1205 DBG("Woken up but nothing in the UST command queue");
1206 /* Continue thread execution */
1207 break;
1208 }
1209
1210 ust_cmd = caa_container_of(node, struct ust_command, node);
1211
1212 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1213 " gid:%d sock:%d name:%s (version %d.%d)",
1214 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1215 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1216 ust_cmd->sock, ust_cmd->reg_msg.name,
1217 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1218 /*
1219 * Inform apps thread of the new application registration. This
1220 * call is blocking so we can be assured that the data will be read
1221 * at some point in time or wait to the end of the world :)
1222 */
1223 ret = write(apps_cmd_pipe[1], ust_cmd,
1224 sizeof(struct ust_command));
1225 if (ret < 0) {
1226 perror("write apps cmd pipe");
1227 if (errno == EBADF) {
1228 /*
1229 * We can't inform the application thread to process
1230 * registration. We will exit or else application
1231 * registration will not occur and tracing will never
1232 * start.
1233 */
1234 goto error;
1235 }
1236 }
1237 free(ust_cmd);
1238 } while (node != NULL);
1239
1240 /* Futex wait on queue. Blocking call on futex() */
1241 futex_nto1_wait(&ust_cmd_queue.futex);
1242 }
1243
1244 error:
1245 DBG("Dispatch thread dying");
1246 return NULL;
1247 }
1248
1249 /*
1250 * This thread manage application registration.
1251 */
1252 static void *thread_registration_apps(void *data)
1253 {
1254 int sock = 0, i, ret, pollfd;
1255 uint32_t revents, nb_fd;
1256 struct lttng_poll_event events;
1257 /*
1258 * Get allocated in this thread, enqueued to a global queue, dequeued and
1259 * freed in the manage apps thread.
1260 */
1261 struct ust_command *ust_cmd = NULL;
1262
1263 DBG("[thread] Manage application registration started");
1264
1265 ret = lttcomm_listen_unix_sock(apps_sock);
1266 if (ret < 0) {
1267 goto error;
1268 }
1269
1270 /*
1271 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1272 * more will be added to this poll set.
1273 */
1274 ret = create_thread_poll_set(&events, 2);
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
1279 /* Add the application registration socket */
1280 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1281 if (ret < 0) {
1282 goto error;
1283 }
1284
1285 /* Notify all applications to register */
1286 ret = notify_ust_apps(1);
1287 if (ret < 0) {
1288 ERR("Failed to notify applications or create the wait shared memory.\n"
1289 "Execution continues but there might be problem for already\n"
1290 "running applications that wishes to register.");
1291 }
1292
1293 while (1) {
1294 DBG("Accepting application registration");
1295
1296 nb_fd = LTTNG_POLL_GETNB(&events);
1297
1298 /* Inifinite blocking call, waiting for transmission */
1299 ret = lttng_poll_wait(&events, -1);
1300 if (ret < 0) {
1301 goto error;
1302 }
1303
1304 for (i = 0; i < nb_fd; i++) {
1305 /* Fetch once the poll data */
1306 revents = LTTNG_POLL_GETEV(&events, i);
1307 pollfd = LTTNG_POLL_GETFD(&events, i);
1308
1309 /* Thread quit pipe has been closed. Killing thread. */
1310 ret = check_thread_quit_pipe(pollfd, revents);
1311 if (ret) {
1312 goto error;
1313 }
1314
1315 /* Event on the registration socket */
1316 if (pollfd == apps_sock) {
1317 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1318 ERR("Register apps socket poll error");
1319 goto error;
1320 } else if (revents & LPOLLIN) {
1321 sock = lttcomm_accept_unix_sock(apps_sock);
1322 if (sock < 0) {
1323 goto error;
1324 }
1325
1326 /* Create UST registration command for enqueuing */
1327 ust_cmd = zmalloc(sizeof(struct ust_command));
1328 if (ust_cmd == NULL) {
1329 perror("ust command zmalloc");
1330 goto error;
1331 }
1332
1333 /*
1334 * Using message-based transmissions to ensure we don't
1335 * have to deal with partially received messages.
1336 */
1337 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1338 sizeof(struct ust_register_msg));
1339 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1340 if (ret < 0) {
1341 perror("lttcomm_recv_unix_sock register apps");
1342 } else {
1343 ERR("Wrong size received on apps register");
1344 }
1345 free(ust_cmd);
1346 close(sock);
1347 continue;
1348 }
1349
1350 ust_cmd->sock = sock;
1351
1352 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1353 " gid:%d sock:%d name:%s (version %d.%d)",
1354 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1355 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1356 ust_cmd->sock, ust_cmd->reg_msg.name,
1357 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1358
1359 /*
1360 * Lock free enqueue the registration request. The red pill
1361 * has been taken! This apps will be part of the *system*.
1362 */
1363 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1364
1365 /*
1366 * Wake the registration queue futex. Implicit memory
1367 * barrier with the exchange in cds_wfq_enqueue.
1368 */
1369 futex_nto1_wake(&ust_cmd_queue.futex);
1370 }
1371 }
1372 }
1373 }
1374
1375 error:
1376 DBG("UST Registration thread dying");
1377
1378 /* Notify that the registration thread is gone */
1379 notify_ust_apps(0);
1380
1381 close(apps_sock);
1382 close(sock);
1383 unlink(apps_unix_sock_path);
1384
1385 lttng_poll_clean(&events);
1386
1387 return NULL;
1388 }
1389
1390 /*
1391 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1392 * exec or it will fails.
1393 */
1394 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1395 {
1396 int ret;
1397 struct timespec timeout;
1398
1399 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1400 timeout.tv_nsec = 0;
1401
1402 /* Setup semaphore */
1403 ret = sem_init(&consumer_data->sem, 0, 0);
1404 if (ret < 0) {
1405 PERROR("sem_init consumer semaphore");
1406 goto error;
1407 }
1408
1409 ret = pthread_create(&consumer_data->thread, NULL,
1410 thread_manage_consumer, consumer_data);
1411 if (ret != 0) {
1412 PERROR("pthread_create consumer");
1413 ret = -1;
1414 goto error;
1415 }
1416
1417 /* Get time for sem_timedwait absolute timeout */
1418 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1419 if (ret < 0) {
1420 PERROR("clock_gettime spawn consumer");
1421 /* Infinite wait for the kconsumerd thread to be ready */
1422 ret = sem_wait(&consumer_data->sem);
1423 } else {
1424 /* Normal timeout if the gettime was successful */
1425 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1426 ret = sem_timedwait(&consumer_data->sem, &timeout);
1427 }
1428
1429 if (ret < 0) {
1430 if (errno == ETIMEDOUT) {
1431 /*
1432 * Call has timed out so we kill the kconsumerd_thread and return
1433 * an error.
1434 */
1435 ERR("The consumer thread was never ready. Killing it");
1436 ret = pthread_cancel(consumer_data->thread);
1437 if (ret < 0) {
1438 PERROR("pthread_cancel consumer thread");
1439 }
1440 } else {
1441 PERROR("semaphore wait failed consumer thread");
1442 }
1443 goto error;
1444 }
1445
1446 pthread_mutex_lock(&consumer_data->pid_mutex);
1447 if (consumer_data->pid == 0) {
1448 ERR("Kconsumerd did not start");
1449 pthread_mutex_unlock(&consumer_data->pid_mutex);
1450 goto error;
1451 }
1452 pthread_mutex_unlock(&consumer_data->pid_mutex);
1453
1454 return 0;
1455
1456 error:
1457 return ret;
1458 }
1459
1460 /*
1461 * Join consumer thread
1462 */
1463 static int join_consumer_thread(struct consumer_data *consumer_data)
1464 {
1465 void *status;
1466 int ret;
1467
1468 if (consumer_data->pid != 0) {
1469 ret = kill(consumer_data->pid, SIGTERM);
1470 if (ret) {
1471 ERR("Error killing consumer daemon");
1472 return ret;
1473 }
1474 return pthread_join(consumer_data->thread, &status);
1475 } else {
1476 return 0;
1477 }
1478 }
1479
1480 /*
1481 * Fork and exec a consumer daemon (consumerd).
1482 *
1483 * Return pid if successful else -1.
1484 */
1485 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1486 {
1487 int ret;
1488 pid_t pid;
1489 const char *consumer_to_use;
1490 const char *verbosity;
1491 struct stat st;
1492
1493 DBG("Spawning consumerd");
1494
1495 pid = fork();
1496 if (pid == 0) {
1497 /*
1498 * Exec consumerd.
1499 */
1500 if (opt_verbose_consumer) {
1501 verbosity = "--verbose";
1502 } else {
1503 verbosity = "--quiet";
1504 }
1505 switch (consumer_data->type) {
1506 case LTTNG_CONSUMER_KERNEL:
1507 /*
1508 * Find out which consumerd to execute. We will first try the
1509 * 64-bit path, then the sessiond's installation directory, and
1510 * fallback on the 32-bit one,
1511 */
1512 DBG3("Looking for a kernel consumer at these locations:");
1513 DBG3(" 1) %s", consumerd64_bin);
1514 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1515 DBG3(" 3) %s", consumerd32_bin);
1516 if (stat(consumerd64_bin, &st) == 0) {
1517 DBG3("Found location #1");
1518 consumer_to_use = consumerd64_bin;
1519 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1520 DBG3("Found location #2");
1521 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1522 } else if (stat(consumerd32_bin, &st) == 0) {
1523 DBG3("Found location #3");
1524 consumer_to_use = consumerd32_bin;
1525 } else {
1526 DBG("Could not find any valid consumerd executable");
1527 break;
1528 }
1529 DBG("Using kernel consumer at: %s", consumer_to_use);
1530 execl(consumer_to_use,
1531 "lttng-consumerd", verbosity, "-k",
1532 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1533 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1534 NULL);
1535 break;
1536 case LTTNG_CONSUMER64_UST:
1537 {
1538 char *tmpnew = NULL;
1539
1540 if (consumerd64_libdir[0] != '\0') {
1541 char *tmp;
1542 size_t tmplen;
1543
1544 tmp = getenv("LD_LIBRARY_PATH");
1545 if (!tmp) {
1546 tmp = "";
1547 }
1548 tmplen = strlen("LD_LIBRARY_PATH=")
1549 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1550 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1551 if (!tmpnew) {
1552 ret = -ENOMEM;
1553 goto error;
1554 }
1555 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1556 strcat(tmpnew, consumerd64_libdir);
1557 if (tmp[0] != '\0') {
1558 strcat(tmpnew, ":");
1559 strcat(tmpnew, tmp);
1560 }
1561 ret = putenv(tmpnew);
1562 if (ret) {
1563 ret = -errno;
1564 goto error;
1565 }
1566 }
1567 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1568 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1569 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1570 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1571 NULL);
1572 if (consumerd64_libdir[0] != '\0') {
1573 free(tmpnew);
1574 }
1575 if (ret) {
1576 goto error;
1577 }
1578 break;
1579 }
1580 case LTTNG_CONSUMER32_UST:
1581 {
1582 char *tmpnew = NULL;
1583
1584 if (consumerd32_libdir[0] != '\0') {
1585 char *tmp;
1586 size_t tmplen;
1587
1588 tmp = getenv("LD_LIBRARY_PATH");
1589 if (!tmp) {
1590 tmp = "";
1591 }
1592 tmplen = strlen("LD_LIBRARY_PATH=")
1593 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1594 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1595 if (!tmpnew) {
1596 ret = -ENOMEM;
1597 goto error;
1598 }
1599 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1600 strcat(tmpnew, consumerd32_libdir);
1601 if (tmp[0] != '\0') {
1602 strcat(tmpnew, ":");
1603 strcat(tmpnew, tmp);
1604 }
1605 ret = putenv(tmpnew);
1606 if (ret) {
1607 ret = -errno;
1608 goto error;
1609 }
1610 }
1611 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1612 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1613 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1614 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1615 NULL);
1616 if (consumerd32_libdir[0] != '\0') {
1617 free(tmpnew);
1618 }
1619 if (ret) {
1620 goto error;
1621 }
1622 break;
1623 }
1624 default:
1625 perror("unknown consumer type");
1626 exit(EXIT_FAILURE);
1627 }
1628 if (errno != 0) {
1629 perror("kernel start consumer exec");
1630 }
1631 exit(EXIT_FAILURE);
1632 } else if (pid > 0) {
1633 ret = pid;
1634 } else {
1635 perror("start consumer fork");
1636 ret = -errno;
1637 }
1638 error:
1639 return ret;
1640 }
1641
1642 /*
1643 * Spawn the consumerd daemon and session daemon thread.
1644 */
1645 static int start_consumerd(struct consumer_data *consumer_data)
1646 {
1647 int ret;
1648
1649 pthread_mutex_lock(&consumer_data->pid_mutex);
1650 if (consumer_data->pid != 0) {
1651 pthread_mutex_unlock(&consumer_data->pid_mutex);
1652 goto end;
1653 }
1654
1655 ret = spawn_consumerd(consumer_data);
1656 if (ret < 0) {
1657 ERR("Spawning consumerd failed");
1658 pthread_mutex_unlock(&consumer_data->pid_mutex);
1659 goto error;
1660 }
1661
1662 /* Setting up the consumer_data pid */
1663 consumer_data->pid = ret;
1664 DBG2("Consumer pid %d", consumer_data->pid);
1665 pthread_mutex_unlock(&consumer_data->pid_mutex);
1666
1667 DBG2("Spawning consumer control thread");
1668 ret = spawn_consumer_thread(consumer_data);
1669 if (ret < 0) {
1670 ERR("Fatal error spawning consumer control thread");
1671 goto error;
1672 }
1673
1674 end:
1675 return 0;
1676
1677 error:
1678 return ret;
1679 }
1680
1681 /*
1682 * Check version of the lttng-modules.
1683 */
1684 static int validate_lttng_modules_version(void)
1685 {
1686 return kernel_validate_version(kernel_tracer_fd);
1687 }
1688
1689 /*
1690 * Setup necessary data for kernel tracer action.
1691 */
1692 static int init_kernel_tracer(void)
1693 {
1694 int ret;
1695
1696 /* Modprobe lttng kernel modules */
1697 ret = modprobe_lttng_control();
1698 if (ret < 0) {
1699 goto error;
1700 }
1701
1702 /* Open debugfs lttng */
1703 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1704 if (kernel_tracer_fd < 0) {
1705 DBG("Failed to open %s", module_proc_lttng);
1706 ret = -1;
1707 goto error_open;
1708 }
1709
1710 /* Validate kernel version */
1711 ret = validate_lttng_modules_version();
1712 if (ret < 0) {
1713 goto error_version;
1714 }
1715
1716 ret = modprobe_lttng_data();
1717 if (ret < 0) {
1718 goto error_modules;
1719 }
1720
1721 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1722 return 0;
1723
1724 error_version:
1725 modprobe_remove_lttng_control();
1726 close(kernel_tracer_fd);
1727 kernel_tracer_fd = 0;
1728 return LTTCOMM_KERN_VERSION;
1729
1730 error_modules:
1731 close(kernel_tracer_fd);
1732
1733 error_open:
1734 modprobe_remove_lttng_control();
1735
1736 error:
1737 WARN("No kernel tracer available");
1738 kernel_tracer_fd = 0;
1739 return LTTCOMM_KERN_NA;
1740 }
1741
1742 /*
1743 * Init tracing by creating trace directory and sending fds kernel consumer.
1744 */
1745 static int init_kernel_tracing(struct ltt_kernel_session *session)
1746 {
1747 int ret = 0;
1748
1749 if (session->consumer_fds_sent == 0) {
1750 /*
1751 * Assign default kernel consumer socket if no consumer assigned to the
1752 * kernel session. At this point, it's NOT suppose to be 0 but this is
1753 * an extra security check.
1754 */
1755 if (session->consumer_fd == 0) {
1756 session->consumer_fd = kconsumer_data.cmd_sock;
1757 }
1758
1759 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1760 if (ret < 0) {
1761 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1762 goto error;
1763 }
1764
1765 session->consumer_fds_sent = 1;
1766 }
1767
1768 error:
1769 return ret;
1770 }
1771
1772 /*
1773 * Create an UST session and add it to the session ust list.
1774 */
1775 static int create_ust_session(struct ltt_session *session,
1776 struct lttng_domain *domain)
1777 {
1778 struct ltt_ust_session *lus = NULL;
1779 int ret;
1780
1781 switch (domain->type) {
1782 case LTTNG_DOMAIN_UST:
1783 break;
1784 default:
1785 ret = LTTCOMM_UNKNOWN_DOMAIN;
1786 goto error;
1787 }
1788
1789 DBG("Creating UST session");
1790
1791 lus = trace_ust_create_session(session->path, session->id, domain);
1792 if (lus == NULL) {
1793 ret = LTTCOMM_UST_SESS_FAIL;
1794 goto error;
1795 }
1796
1797 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1798 session->uid, session->gid);
1799 if (ret < 0) {
1800 if (ret != -EEXIST) {
1801 ERR("Trace directory creation error");
1802 ret = LTTCOMM_UST_SESS_FAIL;
1803 goto error;
1804 }
1805 }
1806
1807 /* The domain type dictate different actions on session creation */
1808 switch (domain->type) {
1809 case LTTNG_DOMAIN_UST:
1810 /* No ustctl for the global UST domain */
1811 break;
1812 default:
1813 ERR("Unknown UST domain on create session %d", domain->type);
1814 goto error;
1815 }
1816 lus->uid = session->uid;
1817 lus->gid = session->gid;
1818 session->ust_session = lus;
1819
1820 return LTTCOMM_OK;
1821
1822 error:
1823 free(lus);
1824 return ret;
1825 }
1826
1827 /*
1828 * Create a kernel tracer session then create the default channel.
1829 */
1830 static int create_kernel_session(struct ltt_session *session)
1831 {
1832 int ret;
1833
1834 DBG("Creating kernel session");
1835
1836 ret = kernel_create_session(session, kernel_tracer_fd);
1837 if (ret < 0) {
1838 ret = LTTCOMM_KERN_SESS_FAIL;
1839 goto error;
1840 }
1841
1842 /* Set kernel consumer socket fd */
1843 if (kconsumer_data.cmd_sock) {
1844 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1845 }
1846
1847 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1848 S_IRWXU | S_IRWXG, session->uid, session->gid);
1849 if (ret < 0) {
1850 if (ret != -EEXIST) {
1851 ERR("Trace directory creation error");
1852 goto error;
1853 }
1854 }
1855 session->kernel_session->uid = session->uid;
1856 session->kernel_session->gid = session->gid;
1857
1858 error:
1859 return ret;
1860 }
1861
1862 /*
1863 * Check if the UID or GID match the session. Root user has access to all
1864 * sessions.
1865 */
1866 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1867 {
1868 if (uid != session->uid && gid != session->gid && uid != 0) {
1869 return 0;
1870 } else {
1871 return 1;
1872 }
1873 }
1874
1875 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1876 {
1877 unsigned int i = 0;
1878 struct ltt_session *session;
1879
1880 DBG("Counting number of available session for UID %d GID %d",
1881 uid, gid);
1882 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1883 /*
1884 * Only list the sessions the user can control.
1885 */
1886 if (!session_access_ok(session, uid, gid)) {
1887 continue;
1888 }
1889 i++;
1890 }
1891 return i;
1892 }
1893
1894 /*
1895 * Using the session list, filled a lttng_session array to send back to the
1896 * client for session listing.
1897 *
1898 * The session list lock MUST be acquired before calling this function. Use
1899 * session_lock_list() and session_unlock_list().
1900 */
1901 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1902 gid_t gid)
1903 {
1904 unsigned int i = 0;
1905 struct ltt_session *session;
1906
1907 DBG("Getting all available session for UID %d GID %d",
1908 uid, gid);
1909 /*
1910 * Iterate over session list and append data after the control struct in
1911 * the buffer.
1912 */
1913 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1914 /*
1915 * Only list the sessions the user can control.
1916 */
1917 if (!session_access_ok(session, uid, gid)) {
1918 continue;
1919 }
1920 strncpy(sessions[i].path, session->path, PATH_MAX);
1921 sessions[i].path[PATH_MAX - 1] = '\0';
1922 strncpy(sessions[i].name, session->name, NAME_MAX);
1923 sessions[i].name[NAME_MAX - 1] = '\0';
1924 sessions[i].enabled = session->enabled;
1925 i++;
1926 }
1927 }
1928
1929 /*
1930 * Fill lttng_channel array of all channels.
1931 */
1932 static void list_lttng_channels(int domain, struct ltt_session *session,
1933 struct lttng_channel *channels)
1934 {
1935 int i = 0;
1936 struct ltt_kernel_channel *kchan;
1937
1938 DBG("Listing channels for session %s", session->name);
1939
1940 switch (domain) {
1941 case LTTNG_DOMAIN_KERNEL:
1942 /* Kernel channels */
1943 if (session->kernel_session != NULL) {
1944 cds_list_for_each_entry(kchan,
1945 &session->kernel_session->channel_list.head, list) {
1946 /* Copy lttng_channel struct to array */
1947 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1948 channels[i].enabled = kchan->enabled;
1949 i++;
1950 }
1951 }
1952 break;
1953 case LTTNG_DOMAIN_UST:
1954 {
1955 struct lttng_ht_iter iter;
1956 struct ltt_ust_channel *uchan;
1957
1958 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1959 &iter.iter, uchan, node.node) {
1960 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1961 channels[i].attr.overwrite = uchan->attr.overwrite;
1962 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1963 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1964 channels[i].attr.switch_timer_interval =
1965 uchan->attr.switch_timer_interval;
1966 channels[i].attr.read_timer_interval =
1967 uchan->attr.read_timer_interval;
1968 channels[i].enabled = uchan->enabled;
1969 switch (uchan->attr.output) {
1970 case LTTNG_UST_MMAP:
1971 default:
1972 channels[i].attr.output = LTTNG_EVENT_MMAP;
1973 break;
1974 }
1975 i++;
1976 }
1977 break;
1978 }
1979 default:
1980 break;
1981 }
1982 }
1983
1984 /*
1985 * Create a list of ust global domain events.
1986 */
1987 static int list_lttng_ust_global_events(char *channel_name,
1988 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1989 {
1990 int i = 0, ret = 0;
1991 unsigned int nb_event = 0;
1992 struct lttng_ht_iter iter;
1993 struct lttng_ht_node_str *node;
1994 struct ltt_ust_channel *uchan;
1995 struct ltt_ust_event *uevent;
1996 struct lttng_event *tmp;
1997
1998 DBG("Listing UST global events for channel %s", channel_name);
1999
2000 rcu_read_lock();
2001
2002 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2003 node = lttng_ht_iter_get_node_str(&iter);
2004 if (node == NULL) {
2005 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2006 goto error;
2007 }
2008
2009 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2010
2011 nb_event += lttng_ht_get_count(uchan->events);
2012
2013 if (nb_event == 0) {
2014 ret = nb_event;
2015 goto error;
2016 }
2017
2018 DBG3("Listing UST global %d events", nb_event);
2019
2020 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2021 if (tmp == NULL) {
2022 ret = -LTTCOMM_FATAL;
2023 goto error;
2024 }
2025
2026 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2027 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2028 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2029 tmp[i].enabled = uevent->enabled;
2030 switch (uevent->attr.instrumentation) {
2031 case LTTNG_UST_TRACEPOINT:
2032 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2033 break;
2034 case LTTNG_UST_PROBE:
2035 tmp[i].type = LTTNG_EVENT_PROBE;
2036 break;
2037 case LTTNG_UST_FUNCTION:
2038 tmp[i].type = LTTNG_EVENT_FUNCTION;
2039 break;
2040 }
2041 tmp[i].loglevel = uevent->attr.loglevel;
2042 switch (uevent->attr.loglevel_type) {
2043 case LTTNG_UST_LOGLEVEL_ALL:
2044 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2045 break;
2046 case LTTNG_UST_LOGLEVEL_RANGE:
2047 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2048 break;
2049 case LTTNG_UST_LOGLEVEL_SINGLE:
2050 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2051 break;
2052 }
2053 i++;
2054 }
2055
2056 ret = nb_event;
2057 *events = tmp;
2058
2059 error:
2060 rcu_read_unlock();
2061 return ret;
2062 }
2063
2064 /*
2065 * Fill lttng_event array of all kernel events in the channel.
2066 */
2067 static int list_lttng_kernel_events(char *channel_name,
2068 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2069 {
2070 int i = 0, ret;
2071 unsigned int nb_event;
2072 struct ltt_kernel_event *event;
2073 struct ltt_kernel_channel *kchan;
2074
2075 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2076 if (kchan == NULL) {
2077 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2078 goto error;
2079 }
2080
2081 nb_event = kchan->event_count;
2082
2083 DBG("Listing events for channel %s", kchan->channel->name);
2084
2085 if (nb_event == 0) {
2086 ret = nb_event;
2087 goto error;
2088 }
2089
2090 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2091 if (*events == NULL) {
2092 ret = LTTCOMM_FATAL;
2093 goto error;
2094 }
2095
2096 /* Kernel channels */
2097 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2098 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2099 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2100 (*events)[i].enabled = event->enabled;
2101 switch (event->event->instrumentation) {
2102 case LTTNG_KERNEL_TRACEPOINT:
2103 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2104 break;
2105 case LTTNG_KERNEL_KPROBE:
2106 case LTTNG_KERNEL_KRETPROBE:
2107 (*events)[i].type = LTTNG_EVENT_PROBE;
2108 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2109 sizeof(struct lttng_kernel_kprobe));
2110 break;
2111 case LTTNG_KERNEL_FUNCTION:
2112 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2113 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2114 sizeof(struct lttng_kernel_function));
2115 break;
2116 case LTTNG_KERNEL_NOOP:
2117 (*events)[i].type = LTTNG_EVENT_NOOP;
2118 break;
2119 case LTTNG_KERNEL_SYSCALL:
2120 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2121 break;
2122 case LTTNG_KERNEL_ALL:
2123 assert(0);
2124 break;
2125 }
2126 i++;
2127 }
2128
2129 return nb_event;
2130
2131 error:
2132 return ret;
2133 }
2134
2135 /*
2136 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2137 */
2138 static int cmd_disable_channel(struct ltt_session *session,
2139 int domain, char *channel_name)
2140 {
2141 int ret;
2142 struct ltt_ust_session *usess;
2143
2144 usess = session->ust_session;
2145
2146 switch (domain) {
2147 case LTTNG_DOMAIN_KERNEL:
2148 {
2149 ret = channel_kernel_disable(session->kernel_session,
2150 channel_name);
2151 if (ret != LTTCOMM_OK) {
2152 goto error;
2153 }
2154
2155 kernel_wait_quiescent(kernel_tracer_fd);
2156 break;
2157 }
2158 case LTTNG_DOMAIN_UST:
2159 {
2160 struct ltt_ust_channel *uchan;
2161 struct lttng_ht *chan_ht;
2162
2163 chan_ht = usess->domain_global.channels;
2164
2165 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2166 if (uchan == NULL) {
2167 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2168 goto error;
2169 }
2170
2171 ret = channel_ust_disable(usess, domain, uchan);
2172 if (ret != LTTCOMM_OK) {
2173 goto error;
2174 }
2175 break;
2176 }
2177 #if 0
2178 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2179 case LTTNG_DOMAIN_UST_EXEC_NAME:
2180 case LTTNG_DOMAIN_UST_PID:
2181 #endif
2182 default:
2183 ret = LTTCOMM_UNKNOWN_DOMAIN;
2184 goto error;
2185 }
2186
2187 ret = LTTCOMM_OK;
2188
2189 error:
2190 return ret;
2191 }
2192
2193 /*
2194 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2195 */
2196 static int cmd_enable_channel(struct ltt_session *session,
2197 int domain, struct lttng_channel *attr)
2198 {
2199 int ret;
2200 struct ltt_ust_session *usess = session->ust_session;
2201 struct lttng_ht *chan_ht;
2202
2203 DBG("Enabling channel %s for session %s", attr->name, session->name);
2204
2205 switch (domain) {
2206 case LTTNG_DOMAIN_KERNEL:
2207 {
2208 struct ltt_kernel_channel *kchan;
2209
2210 kchan = trace_kernel_get_channel_by_name(attr->name,
2211 session->kernel_session);
2212 if (kchan == NULL) {
2213 ret = channel_kernel_create(session->kernel_session,
2214 attr, kernel_poll_pipe[1]);
2215 } else {
2216 ret = channel_kernel_enable(session->kernel_session, kchan);
2217 }
2218
2219 if (ret != LTTCOMM_OK) {
2220 goto error;
2221 }
2222
2223 kernel_wait_quiescent(kernel_tracer_fd);
2224 break;
2225 }
2226 case LTTNG_DOMAIN_UST:
2227 {
2228 struct ltt_ust_channel *uchan;
2229
2230 chan_ht = usess->domain_global.channels;
2231
2232 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2233 if (uchan == NULL) {
2234 ret = channel_ust_create(usess, domain, attr);
2235 } else {
2236 ret = channel_ust_enable(usess, domain, uchan);
2237 }
2238 break;
2239 }
2240 #if 0
2241 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2242 case LTTNG_DOMAIN_UST_EXEC_NAME:
2243 case LTTNG_DOMAIN_UST_PID:
2244 #endif
2245 default:
2246 ret = LTTCOMM_UNKNOWN_DOMAIN;
2247 goto error;
2248 }
2249
2250 error:
2251 return ret;
2252 }
2253
2254 /*
2255 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2256 */
2257 static int cmd_disable_event(struct ltt_session *session, int domain,
2258 char *channel_name, char *event_name)
2259 {
2260 int ret;
2261
2262 switch (domain) {
2263 case LTTNG_DOMAIN_KERNEL:
2264 {
2265 struct ltt_kernel_channel *kchan;
2266 struct ltt_kernel_session *ksess;
2267
2268 ksess = session->kernel_session;
2269
2270 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2271 if (kchan == NULL) {
2272 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2273 goto error;
2274 }
2275
2276 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2277 if (ret != LTTCOMM_OK) {
2278 goto error;
2279 }
2280
2281 kernel_wait_quiescent(kernel_tracer_fd);
2282 break;
2283 }
2284 case LTTNG_DOMAIN_UST:
2285 {
2286 struct ltt_ust_channel *uchan;
2287 struct ltt_ust_session *usess;
2288
2289 usess = session->ust_session;
2290
2291 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2292 channel_name);
2293 if (uchan == NULL) {
2294 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2295 goto error;
2296 }
2297
2298 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2299 if (ret != LTTCOMM_OK) {
2300 goto error;
2301 }
2302
2303 DBG3("Disable UST event %s in channel %s completed", event_name,
2304 channel_name);
2305 break;
2306 }
2307 #if 0
2308 case LTTNG_DOMAIN_UST_EXEC_NAME:
2309 case LTTNG_DOMAIN_UST_PID:
2310 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2311 #endif
2312 default:
2313 ret = LTTCOMM_UND;
2314 goto error;
2315 }
2316
2317 ret = LTTCOMM_OK;
2318
2319 error:
2320 return ret;
2321 }
2322
2323 /*
2324 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2325 */
2326 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2327 char *channel_name)
2328 {
2329 int ret;
2330
2331 switch (domain) {
2332 case LTTNG_DOMAIN_KERNEL:
2333 {
2334 struct ltt_kernel_session *ksess;
2335 struct ltt_kernel_channel *kchan;
2336
2337 ksess = session->kernel_session;
2338
2339 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2340 if (kchan == NULL) {
2341 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2342 goto error;
2343 }
2344
2345 ret = event_kernel_disable_all(ksess, kchan);
2346 if (ret != LTTCOMM_OK) {
2347 goto error;
2348 }
2349
2350 kernel_wait_quiescent(kernel_tracer_fd);
2351 break;
2352 }
2353 case LTTNG_DOMAIN_UST:
2354 {
2355 struct ltt_ust_session *usess;
2356 struct ltt_ust_channel *uchan;
2357
2358 usess = session->ust_session;
2359
2360 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2361 channel_name);
2362 if (uchan == NULL) {
2363 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2364 goto error;
2365 }
2366
2367 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2368 if (ret != 0) {
2369 goto error;
2370 }
2371
2372 DBG3("Disable all UST events in channel %s completed", channel_name);
2373
2374 break;
2375 }
2376 #if 0
2377 case LTTNG_DOMAIN_UST_EXEC_NAME:
2378 case LTTNG_DOMAIN_UST_PID:
2379 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2380 #endif
2381 default:
2382 ret = LTTCOMM_UND;
2383 goto error;
2384 }
2385
2386 ret = LTTCOMM_OK;
2387
2388 error:
2389 return ret;
2390 }
2391
2392 /*
2393 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2394 */
2395 static int cmd_add_context(struct ltt_session *session, int domain,
2396 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2397 {
2398 int ret;
2399
2400 switch (domain) {
2401 case LTTNG_DOMAIN_KERNEL:
2402 /* Add kernel context to kernel tracer */
2403 ret = context_kernel_add(session->kernel_session, ctx,
2404 event_name, channel_name);
2405 if (ret != LTTCOMM_OK) {
2406 goto error;
2407 }
2408 break;
2409 case LTTNG_DOMAIN_UST:
2410 {
2411 struct ltt_ust_session *usess = session->ust_session;
2412
2413 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2414 if (ret != LTTCOMM_OK) {
2415 goto error;
2416 }
2417 break;
2418 }
2419 #if 0
2420 case LTTNG_DOMAIN_UST_EXEC_NAME:
2421 case LTTNG_DOMAIN_UST_PID:
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2423 #endif
2424 default:
2425 ret = LTTCOMM_UND;
2426 goto error;
2427 }
2428
2429 ret = LTTCOMM_OK;
2430
2431 error:
2432 return ret;
2433 }
2434
2435 /*
2436 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2437 */
2438 static int cmd_enable_event(struct ltt_session *session, int domain,
2439 char *channel_name, struct lttng_event *event)
2440 {
2441 int ret;
2442 struct lttng_channel *attr;
2443 struct ltt_ust_session *usess = session->ust_session;
2444
2445 switch (domain) {
2446 case LTTNG_DOMAIN_KERNEL:
2447 {
2448 struct ltt_kernel_channel *kchan;
2449
2450 kchan = trace_kernel_get_channel_by_name(channel_name,
2451 session->kernel_session);
2452 if (kchan == NULL) {
2453 attr = channel_new_default_attr(domain);
2454 if (attr == NULL) {
2455 ret = LTTCOMM_FATAL;
2456 goto error;
2457 }
2458 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2459
2460 /* This call will notify the kernel thread */
2461 ret = channel_kernel_create(session->kernel_session,
2462 attr, kernel_poll_pipe[1]);
2463 if (ret != LTTCOMM_OK) {
2464 free(attr);
2465 goto error;
2466 }
2467 free(attr);
2468 }
2469
2470 /* Get the newly created kernel channel pointer */
2471 kchan = trace_kernel_get_channel_by_name(channel_name,
2472 session->kernel_session);
2473 if (kchan == NULL) {
2474 /* This sould not happen... */
2475 ret = LTTCOMM_FATAL;
2476 goto error;
2477 }
2478
2479 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2480 event);
2481 if (ret != LTTCOMM_OK) {
2482 goto error;
2483 }
2484
2485 kernel_wait_quiescent(kernel_tracer_fd);
2486 break;
2487 }
2488 case LTTNG_DOMAIN_UST:
2489 {
2490 struct lttng_channel *attr;
2491 struct ltt_ust_channel *uchan;
2492
2493 /* Get channel from global UST domain */
2494 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2495 channel_name);
2496 if (uchan == NULL) {
2497 /* Create default channel */
2498 attr = channel_new_default_attr(domain);
2499 if (attr == NULL) {
2500 ret = LTTCOMM_FATAL;
2501 goto error;
2502 }
2503 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2504 attr->name[NAME_MAX - 1] = '\0';
2505
2506 ret = channel_ust_create(usess, domain, attr);
2507 if (ret != LTTCOMM_OK) {
2508 free(attr);
2509 goto error;
2510 }
2511 free(attr);
2512
2513 /* Get the newly created channel reference back */
2514 uchan = trace_ust_find_channel_by_name(
2515 usess->domain_global.channels, channel_name);
2516 if (uchan == NULL) {
2517 /* Something is really wrong */
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
2521 }
2522
2523 /* At this point, the session and channel exist on the tracer */
2524 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2525 if (ret != LTTCOMM_OK) {
2526 goto error;
2527 }
2528 break;
2529 }
2530 #if 0
2531 case LTTNG_DOMAIN_UST_EXEC_NAME:
2532 case LTTNG_DOMAIN_UST_PID:
2533 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2534 #endif
2535 default:
2536 ret = LTTCOMM_UND;
2537 goto error;
2538 }
2539
2540 ret = LTTCOMM_OK;
2541
2542 error:
2543 return ret;
2544 }
2545
2546 /*
2547 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2548 */
2549 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2550 char *channel_name, int event_type)
2551 {
2552 int ret;
2553 struct ltt_kernel_channel *kchan;
2554
2555 switch (domain) {
2556 case LTTNG_DOMAIN_KERNEL:
2557 kchan = trace_kernel_get_channel_by_name(channel_name,
2558 session->kernel_session);
2559 if (kchan == NULL) {
2560 /* This call will notify the kernel thread */
2561 ret = channel_kernel_create(session->kernel_session, NULL,
2562 kernel_poll_pipe[1]);
2563 if (ret != LTTCOMM_OK) {
2564 goto error;
2565 }
2566
2567 /* Get the newly created kernel channel pointer */
2568 kchan = trace_kernel_get_channel_by_name(channel_name,
2569 session->kernel_session);
2570 if (kchan == NULL) {
2571 /* This sould not happen... */
2572 ret = LTTCOMM_FATAL;
2573 goto error;
2574 }
2575
2576 }
2577
2578 switch (event_type) {
2579 case LTTNG_EVENT_SYSCALL:
2580 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2581 kchan, kernel_tracer_fd);
2582 break;
2583 case LTTNG_EVENT_TRACEPOINT:
2584 /*
2585 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2586 * events already registered to the channel.
2587 */
2588 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2589 kchan, kernel_tracer_fd);
2590 break;
2591 case LTTNG_EVENT_ALL:
2592 /* Enable syscalls and tracepoints */
2593 ret = event_kernel_enable_all(session->kernel_session,
2594 kchan, kernel_tracer_fd);
2595 break;
2596 default:
2597 ret = LTTCOMM_KERN_ENABLE_FAIL;
2598 goto error;
2599 }
2600
2601 /* Manage return value */
2602 if (ret != LTTCOMM_OK) {
2603 goto error;
2604 }
2605
2606 kernel_wait_quiescent(kernel_tracer_fd);
2607 break;
2608 case LTTNG_DOMAIN_UST:
2609 {
2610 struct lttng_channel *attr;
2611 struct ltt_ust_channel *uchan;
2612 struct ltt_ust_session *usess = session->ust_session;
2613
2614 /* Get channel from global UST domain */
2615 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2616 channel_name);
2617 if (uchan == NULL) {
2618 /* Create default channel */
2619 attr = channel_new_default_attr(domain);
2620 if (attr == NULL) {
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
2624 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2625 attr->name[NAME_MAX - 1] = '\0';
2626
2627 /* Use the internal command enable channel */
2628 ret = channel_ust_create(usess, domain, attr);
2629 if (ret != LTTCOMM_OK) {
2630 free(attr);
2631 goto error;
2632 }
2633 free(attr);
2634
2635 /* Get the newly created channel reference back */
2636 uchan = trace_ust_find_channel_by_name(
2637 usess->domain_global.channels, channel_name);
2638 if (uchan == NULL) {
2639 /* Something is really wrong */
2640 ret = LTTCOMM_FATAL;
2641 goto error;
2642 }
2643 }
2644
2645 /* At this point, the session and channel exist on the tracer */
2646
2647 switch (event_type) {
2648 case LTTNG_EVENT_ALL:
2649 case LTTNG_EVENT_TRACEPOINT:
2650 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2651 if (ret != LTTCOMM_OK) {
2652 goto error;
2653 }
2654 break;
2655 default:
2656 ret = LTTCOMM_UST_ENABLE_FAIL;
2657 goto error;
2658 }
2659
2660 /* Manage return value */
2661 if (ret != LTTCOMM_OK) {
2662 goto error;
2663 }
2664
2665 break;
2666 }
2667 #if 0
2668 case LTTNG_DOMAIN_UST_EXEC_NAME:
2669 case LTTNG_DOMAIN_UST_PID:
2670 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2671 #endif
2672 default:
2673 ret = LTTCOMM_UND;
2674 goto error;
2675 }
2676
2677 ret = LTTCOMM_OK;
2678
2679 error:
2680 return ret;
2681 }
2682
2683 /*
2684 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2685 */
2686 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2687 {
2688 int ret;
2689 ssize_t nb_events = 0;
2690
2691 switch (domain) {
2692 case LTTNG_DOMAIN_KERNEL:
2693 nb_events = kernel_list_events(kernel_tracer_fd, events);
2694 if (nb_events < 0) {
2695 ret = LTTCOMM_KERN_LIST_FAIL;
2696 goto error;
2697 }
2698 break;
2699 case LTTNG_DOMAIN_UST:
2700 nb_events = ust_app_list_events(events);
2701 if (nb_events < 0) {
2702 ret = LTTCOMM_UST_LIST_FAIL;
2703 goto error;
2704 }
2705 break;
2706 default:
2707 ret = LTTCOMM_UND;
2708 goto error;
2709 }
2710
2711 return nb_events;
2712
2713 error:
2714 /* Return negative value to differentiate return code */
2715 return -ret;
2716 }
2717
2718 /*
2719 * Command LTTNG_START_TRACE processed by the client thread.
2720 */
2721 static int cmd_start_trace(struct ltt_session *session)
2722 {
2723 int ret;
2724 struct ltt_kernel_session *ksession;
2725 struct ltt_ust_session *usess;
2726
2727 /* Short cut */
2728 ksession = session->kernel_session;
2729 usess = session->ust_session;
2730
2731 if (session->enabled) {
2732 ret = LTTCOMM_UST_START_FAIL;
2733 goto error;
2734 }
2735
2736 session->enabled = 1;
2737
2738 /* Kernel tracing */
2739 if (ksession != NULL) {
2740 struct ltt_kernel_channel *kchan;
2741
2742 /* Open kernel metadata */
2743 if (ksession->metadata == NULL) {
2744 ret = kernel_open_metadata(ksession, ksession->trace_path);
2745 if (ret < 0) {
2746 ret = LTTCOMM_KERN_META_FAIL;
2747 goto error;
2748 }
2749 }
2750
2751 /* Open kernel metadata stream */
2752 if (ksession->metadata_stream_fd == 0) {
2753 ret = kernel_open_metadata_stream(ksession);
2754 if (ret < 0) {
2755 ERR("Kernel create metadata stream failed");
2756 ret = LTTCOMM_KERN_STREAM_FAIL;
2757 goto error;
2758 }
2759 }
2760
2761 /* For each channel */
2762 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2763 if (kchan->stream_count == 0) {
2764 ret = kernel_open_channel_stream(kchan);
2765 if (ret < 0) {
2766 ret = LTTCOMM_KERN_STREAM_FAIL;
2767 goto error;
2768 }
2769 /* Update the stream global counter */
2770 ksession->stream_count_global += ret;
2771 }
2772 }
2773
2774 /* Setup kernel consumer socket and send fds to it */
2775 ret = init_kernel_tracing(ksession);
2776 if (ret < 0) {
2777 ret = LTTCOMM_KERN_START_FAIL;
2778 goto error;
2779 }
2780
2781 /* This start the kernel tracing */
2782 ret = kernel_start_session(ksession);
2783 if (ret < 0) {
2784 ret = LTTCOMM_KERN_START_FAIL;
2785 goto error;
2786 }
2787
2788 /* Quiescent wait after starting trace */
2789 kernel_wait_quiescent(kernel_tracer_fd);
2790 }
2791
2792 /* Flag session that trace should start automatically */
2793 if (usess) {
2794 usess->start_trace = 1;
2795
2796 ret = ust_app_start_trace_all(usess);
2797 if (ret < 0) {
2798 ret = LTTCOMM_UST_START_FAIL;
2799 goto error;
2800 }
2801 }
2802
2803 ret = LTTCOMM_OK;
2804
2805 error:
2806 return ret;
2807 }
2808
2809 /*
2810 * Command LTTNG_STOP_TRACE processed by the client thread.
2811 */
2812 static int cmd_stop_trace(struct ltt_session *session)
2813 {
2814 int ret;
2815 struct ltt_kernel_channel *kchan;
2816 struct ltt_kernel_session *ksession;
2817 struct ltt_ust_session *usess;
2818
2819 /* Short cut */
2820 ksession = session->kernel_session;
2821 usess = session->ust_session;
2822
2823 if (!session->enabled) {
2824 ret = LTTCOMM_UST_STOP_FAIL;
2825 goto error;
2826 }
2827
2828 session->enabled = 0;
2829
2830 /* Kernel tracer */
2831 if (ksession != NULL) {
2832 DBG("Stop kernel tracing");
2833
2834 /* Flush all buffers before stopping */
2835 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2836 if (ret < 0) {
2837 ERR("Kernel metadata flush failed");
2838 }
2839
2840 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2841 ret = kernel_flush_buffer(kchan);
2842 if (ret < 0) {
2843 ERR("Kernel flush buffer error");
2844 }
2845 }
2846
2847 ret = kernel_stop_session(ksession);
2848 if (ret < 0) {
2849 ret = LTTCOMM_KERN_STOP_FAIL;
2850 goto error;
2851 }
2852
2853 kernel_wait_quiescent(kernel_tracer_fd);
2854 }
2855
2856 if (usess) {
2857 usess->start_trace = 0;
2858
2859 ret = ust_app_stop_trace_all(usess);
2860 if (ret < 0) {
2861 ret = LTTCOMM_UST_STOP_FAIL;
2862 goto error;
2863 }
2864 }
2865
2866 ret = LTTCOMM_OK;
2867
2868 error:
2869 return ret;
2870 }
2871
2872 /*
2873 * Command LTTNG_CREATE_SESSION processed by the client thread.
2874 */
2875 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2876 {
2877 int ret;
2878
2879 ret = session_create(name, path, creds->uid, creds->gid);
2880 if (ret != LTTCOMM_OK) {
2881 goto error;
2882 }
2883
2884 ret = LTTCOMM_OK;
2885
2886 error:
2887 return ret;
2888 }
2889
2890 /*
2891 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2892 */
2893 static int cmd_destroy_session(struct ltt_session *session, char *name)
2894 {
2895 int ret;
2896
2897 /* Clean kernel session teardown */
2898 teardown_kernel_session(session);
2899 /* UST session teardown */
2900 teardown_ust_session(session);
2901
2902 /*
2903 * Must notify the kernel thread here to update it's poll setin order
2904 * to remove the channel(s)' fd just destroyed.
2905 */
2906 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2907 if (ret < 0) {
2908 perror("write kernel poll pipe");
2909 }
2910
2911 ret = session_destroy(session);
2912
2913 return ret;
2914 }
2915
2916 /*
2917 * Command LTTNG_CALIBRATE processed by the client thread.
2918 */
2919 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2920 {
2921 int ret;
2922
2923 switch (domain) {
2924 case LTTNG_DOMAIN_KERNEL:
2925 {
2926 struct lttng_kernel_calibrate kcalibrate;
2927
2928 kcalibrate.type = calibrate->type;
2929 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2930 if (ret < 0) {
2931 ret = LTTCOMM_KERN_ENABLE_FAIL;
2932 goto error;
2933 }
2934 break;
2935 }
2936 case LTTNG_DOMAIN_UST:
2937 {
2938 struct lttng_ust_calibrate ucalibrate;
2939
2940 ucalibrate.type = calibrate->type;
2941 ret = ust_app_calibrate_glb(&ucalibrate);
2942 if (ret < 0) {
2943 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2944 goto error;
2945 }
2946 break;
2947 }
2948 default:
2949 ret = LTTCOMM_UND;
2950 goto error;
2951 }
2952
2953 ret = LTTCOMM_OK;
2954
2955 error:
2956 return ret;
2957 }
2958
2959 /*
2960 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2961 */
2962 static int cmd_register_consumer(struct ltt_session *session, int domain,
2963 char *sock_path)
2964 {
2965 int ret, sock;
2966
2967 switch (domain) {
2968 case LTTNG_DOMAIN_KERNEL:
2969 /* Can't register a consumer if there is already one */
2970 if (session->kernel_session->consumer_fds_sent != 0) {
2971 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2972 goto error;
2973 }
2974
2975 sock = lttcomm_connect_unix_sock(sock_path);
2976 if (sock < 0) {
2977 ret = LTTCOMM_CONNECT_FAIL;
2978 goto error;
2979 }
2980
2981 session->kernel_session->consumer_fd = sock;
2982 break;
2983 default:
2984 /* TODO: Userspace tracing */
2985 ret = LTTCOMM_UND;
2986 goto error;
2987 }
2988
2989 ret = LTTCOMM_OK;
2990
2991 error:
2992 return ret;
2993 }
2994
2995 /*
2996 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2997 */
2998 static ssize_t cmd_list_domains(struct ltt_session *session,
2999 struct lttng_domain **domains)
3000 {
3001 int ret, index = 0;
3002 ssize_t nb_dom = 0;
3003
3004 if (session->kernel_session != NULL) {
3005 DBG3("Listing domains found kernel domain");
3006 nb_dom++;
3007 }
3008
3009 if (session->ust_session != NULL) {
3010 DBG3("Listing domains found UST global domain");
3011 nb_dom++;
3012 }
3013
3014 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3015 if (*domains == NULL) {
3016 ret = -LTTCOMM_FATAL;
3017 goto error;
3018 }
3019
3020 if (session->kernel_session != NULL) {
3021 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3022 index++;
3023 }
3024
3025 if (session->ust_session != NULL) {
3026 (*domains)[index].type = LTTNG_DOMAIN_UST;
3027 index++;
3028 }
3029
3030 return nb_dom;
3031
3032 error:
3033 return ret;
3034 }
3035
3036 /*
3037 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3038 */
3039 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3040 struct lttng_channel **channels)
3041 {
3042 int ret;
3043 ssize_t nb_chan = 0;
3044
3045 switch (domain) {
3046 case LTTNG_DOMAIN_KERNEL:
3047 if (session->kernel_session != NULL) {
3048 nb_chan = session->kernel_session->channel_count;
3049 }
3050 DBG3("Number of kernel channels %zd", nb_chan);
3051 break;
3052 case LTTNG_DOMAIN_UST:
3053 if (session->ust_session != NULL) {
3054 nb_chan = lttng_ht_get_count(
3055 session->ust_session->domain_global.channels);
3056 }
3057 DBG3("Number of UST global channels %zd", nb_chan);
3058 break;
3059 default:
3060 *channels = NULL;
3061 ret = -LTTCOMM_UND;
3062 goto error;
3063 }
3064
3065 if (nb_chan > 0) {
3066 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3067 if (*channels == NULL) {
3068 ret = -LTTCOMM_FATAL;
3069 goto error;
3070 }
3071
3072 list_lttng_channels(domain, session, *channels);
3073 } else {
3074 *channels = NULL;
3075 }
3076
3077 return nb_chan;
3078
3079 error:
3080 return ret;
3081 }
3082
3083 /*
3084 * Command LTTNG_LIST_EVENTS processed by the client thread.
3085 */
3086 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3087 char *channel_name, struct lttng_event **events)
3088 {
3089 int ret = 0;
3090 ssize_t nb_event = 0;
3091
3092 switch (domain) {
3093 case LTTNG_DOMAIN_KERNEL:
3094 if (session->kernel_session != NULL) {
3095 nb_event = list_lttng_kernel_events(channel_name,
3096 session->kernel_session, events);
3097 }
3098 break;
3099 case LTTNG_DOMAIN_UST:
3100 {
3101 if (session->ust_session != NULL) {
3102 nb_event = list_lttng_ust_global_events(channel_name,
3103 &session->ust_session->domain_global, events);
3104 }
3105 break;
3106 }
3107 default:
3108 ret = -LTTCOMM_UND;
3109 goto error;
3110 }
3111
3112 ret = nb_event;
3113
3114 error:
3115 return ret;
3116 }
3117
3118 /*
3119 * Process the command requested by the lttng client within the command
3120 * context structure. This function make sure that the return structure (llm)
3121 * is set and ready for transmission before returning.
3122 *
3123 * Return any error encountered or 0 for success.
3124 */
3125 static int process_client_msg(struct command_ctx *cmd_ctx)
3126 {
3127 int ret = LTTCOMM_OK;
3128 int need_tracing_session = 1;
3129
3130 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3131
3132 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3133 ret = LTTCOMM_KERN_NA;
3134 goto error;
3135 }
3136
3137 /*
3138 * Check for command that don't needs to allocate a returned payload. We do
3139 * this here so we don't have to make the call for no payload at each
3140 * command.
3141 */
3142 switch(cmd_ctx->lsm->cmd_type) {
3143 case LTTNG_LIST_SESSIONS:
3144 case LTTNG_LIST_TRACEPOINTS:
3145 case LTTNG_LIST_DOMAINS:
3146 case LTTNG_LIST_CHANNELS:
3147 case LTTNG_LIST_EVENTS:
3148 break;
3149 default:
3150 /* Setup lttng message with no payload */
3151 ret = setup_lttng_msg(cmd_ctx, 0);
3152 if (ret < 0) {
3153 /* This label does not try to unlock the session */
3154 goto init_setup_error;
3155 }
3156 }
3157
3158 /* Commands that DO NOT need a session. */
3159 switch (cmd_ctx->lsm->cmd_type) {
3160 case LTTNG_CALIBRATE:
3161 case LTTNG_CREATE_SESSION:
3162 case LTTNG_LIST_SESSIONS:
3163 case LTTNG_LIST_TRACEPOINTS:
3164 need_tracing_session = 0;
3165 break;
3166 default:
3167 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3168 session_lock_list();
3169 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3170 session_unlock_list();
3171 if (cmd_ctx->session == NULL) {
3172 if (cmd_ctx->lsm->session.name != NULL) {
3173 ret = LTTCOMM_SESS_NOT_FOUND;
3174 } else {
3175 /* If no session name specified */
3176 ret = LTTCOMM_SELECT_SESS;
3177 }
3178 goto error;
3179 } else {
3180 /* Acquire lock for the session */
3181 session_lock(cmd_ctx->session);
3182 }
3183 break;
3184 }
3185
3186 /*
3187 * Check domain type for specific "pre-action".
3188 */
3189 switch (cmd_ctx->lsm->domain.type) {
3190 case LTTNG_DOMAIN_KERNEL:
3191 if (!is_root) {
3192 ret = LTTCOMM_KERN_NA;
3193 goto error;
3194 }
3195
3196 /* Kernel tracer check */
3197 if (kernel_tracer_fd == 0) {
3198 /* Basically, load kernel tracer modules */
3199 ret = init_kernel_tracer();
3200 if (ret != 0) {
3201 goto error;
3202 }
3203 }
3204
3205 /* Need a session for kernel command */
3206 if (need_tracing_session) {
3207 if (cmd_ctx->session->kernel_session == NULL) {
3208 ret = create_kernel_session(cmd_ctx->session);
3209 if (ret < 0) {
3210 ret = LTTCOMM_KERN_SESS_FAIL;
3211 goto error;
3212 }
3213 }
3214
3215 /* Start the kernel consumer daemon */
3216 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3217 if (kconsumer_data.pid == 0 &&
3218 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3219 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3220 ret = start_consumerd(&kconsumer_data);
3221 if (ret < 0) {
3222 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3223 goto error;
3224 }
3225 } else {
3226 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3227 }
3228 }
3229 break;
3230 case LTTNG_DOMAIN_UST:
3231 {
3232 if (need_tracing_session) {
3233 if (cmd_ctx->session->ust_session == NULL) {
3234 ret = create_ust_session(cmd_ctx->session,
3235 &cmd_ctx->lsm->domain);
3236 if (ret != LTTCOMM_OK) {
3237 goto error;
3238 }
3239 }
3240 /* Start the UST consumer daemons */
3241 /* 64-bit */
3242 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3243 if (consumerd64_bin[0] != '\0' &&
3244 ustconsumer64_data.pid == 0 &&
3245 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3246 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3247 ret = start_consumerd(&ustconsumer64_data);
3248 if (ret < 0) {
3249 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3250 ust_consumerd64_fd = -EINVAL;
3251 goto error;
3252 }
3253
3254 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3255 } else {
3256 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3257 }
3258 /* 32-bit */
3259 if (consumerd32_bin[0] != '\0' &&
3260 ustconsumer32_data.pid == 0 &&
3261 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER)