projects / lttng-tools.git / blob
? search:


ff29eb03566775b8cc351296f4dab543a732cc0a
[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 .err_sock = -1,
104 .cmd_sock = -1,
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 .err_sock = -1,
111 .cmd_sock = -1,
112 };
113 static struct consumer_data ustconsumer32_data = {
114 .type = LTTNG_CONSUMER32_UST,
115 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
116 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
117 .err_sock = -1,
118 .cmd_sock = -1,
119 };
120
121 static int dispatch_thread_exit;
122
123 /* Global application Unix socket path */
124 static char apps_unix_sock_path[PATH_MAX];
125 /* Global client Unix socket path */
126 static char client_unix_sock_path[PATH_MAX];
127 /* global wait shm path for UST */
128 static char wait_shm_path[PATH_MAX];
129
130 /* Sockets and FDs */
131 static int client_sock = -1;
132 static int apps_sock = -1;
133 static int kernel_tracer_fd = -1;
134 static int kernel_poll_pipe[2] = { -1, -1 };
135
136 /*
137 * Quit pipe for all threads. This permits a single cancellation point
138 * for all threads when receiving an event on the pipe.
139 */
140 static int thread_quit_pipe[2] = { -1, -1 };
141
142 /*
143 * This pipe is used to inform the thread managing application communication
144 * that a command is queued and ready to be processed.
145 */
146 static int apps_cmd_pipe[2] = { -1, -1 };
147
148 /* Pthread, Mutexes and Semaphores */
149 static pthread_t apps_thread;
150 static pthread_t reg_apps_thread;
151 static pthread_t client_thread;
152 static pthread_t kernel_thread;
153 static pthread_t dispatch_thread;
154
155
156 /*
157 * UST registration command queue. This queue is tied with a futex and uses a N
158 * wakers / 1 waiter implemented and detailed in futex.c/.h
159 *
160 * The thread_manage_apps and thread_dispatch_ust_registration interact with
161 * this queue and the wait/wake scheme.
162 */
163 static struct ust_cmd_queue ust_cmd_queue;
164
165 /*
166 * Pointer initialized before thread creation.
167 *
168 * This points to the tracing session list containing the session count and a
169 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
170 * MUST NOT be taken if you call a public function in session.c.
171 *
172 * The lock is nested inside the structure: session_list_ptr->lock. Please use
173 * session_lock_list and session_unlock_list for lock acquisition.
174 */
175 static struct ltt_session_list *session_list_ptr;
176
177 int ust_consumerd64_fd = -1;
178 int ust_consumerd32_fd = -1;
179
180 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
181 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
182 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
183 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
184
185 static
186 void setup_consumerd_path(void)
187 {
188 const char *bin, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195 #if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202 #elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209 #else
210 #error "Unknown bitness"
211 #endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
223 }
224 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232 }
233
234 /*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237 static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239 {
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260 error:
261 return ret;
262 }
263
264 /*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269 static int check_thread_quit_pipe(int fd, uint32_t events)
270 {
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276 }
277
278 /*
279 * Return group ID of the tracing group or -1 if not found.
280 */
281 static gid_t allowed_group(void)
282 {
283 struct group *grp;
284
285 if (opt_tracing_group) {
286 grp = getgrnam(opt_tracing_group);
287 } else {
288 grp = getgrnam(default_tracing_group);
289 }
290 if (!grp) {
291 return -1;
292 } else {
293 return grp->gr_gid;
294 }
295 }
296
297 /*
298 * Init thread quit pipe.
299 *
300 * Return -1 on error or 0 if all pipes are created.
301 */
302 static int init_thread_quit_pipe(void)
303 {
304 int ret;
305
306 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
307 if (ret < 0) {
308 PERROR("thread quit pipe");
309 goto error;
310 }
311
312 error:
313 return ret;
314 }
315
316 /*
317 * Complete teardown of a kernel session. This free all data structure related
318 * to a kernel session and update counter.
319 */
320 static void teardown_kernel_session(struct ltt_session *session)
321 {
322 if (!session->kernel_session) {
323 DBG3("No kernel session when tearing down session");
324 return;
325 }
326
327 DBG("Tearing down kernel session");
328
329 /*
330 * If a custom kernel consumer was registered, close the socket before
331 * tearing down the complete kernel session structure
332 */
333 if (kconsumer_data.cmd_sock >= 0 &&
334 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
335 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
336 }
337
338 trace_kernel_destroy_session(session->kernel_session);
339 }
340
341 /*
342 * Complete teardown of all UST sessions. This will free everything on his path
343 * and destroy the core essence of all ust sessions :)
344 */
345 static void teardown_ust_session(struct ltt_session *session)
346 {
347 int ret;
348
349 if (!session->ust_session) {
350 DBG3("No UST session when tearing down session");
351 return;
352 }
353
354 DBG("Tearing down UST session(s)");
355
356 ret = ust_app_destroy_trace_all(session->ust_session);
357 if (ret) {
358 ERR("Error in ust_app_destroy_trace_all");
359 }
360
361 trace_ust_destroy_session(session->ust_session);
362 }
363
364 /*
365 * Stop all threads by closing the thread quit pipe.
366 */
367 static void stop_threads(void)
368 {
369 int ret;
370
371 /* Stopping all threads */
372 DBG("Terminating all threads");
373 ret = notify_thread_pipe(thread_quit_pipe[1]);
374 if (ret < 0) {
375 ERR("write error on thread quit pipe");
376 }
377
378 /* Dispatch thread */
379 dispatch_thread_exit = 1;
380 futex_nto1_wake(&ust_cmd_queue.futex);
381 }
382
383 /*
384 * Cleanup the daemon
385 */
386 static void cleanup(void)
387 {
388 int ret, i;
389 char *cmd;
390 struct ltt_session *sess, *stmp;
391
392 DBG("Cleaning up");
393
394 DBG("Removing %s directory", rundir);
395 ret = asprintf(&cmd, "rm -rf %s", rundir);
396 if (ret < 0) {
397 ERR("asprintf failed. Something is really wrong!");
398 }
399
400 /* Remove lttng run directory */
401 ret = system(cmd);
402 if (ret < 0) {
403 ERR("Unable to clean %s", rundir);
404 }
405 free(cmd);
406
407 DBG("Cleaning up all sessions");
408
409 /* Destroy session list mutex */
410 if (session_list_ptr != NULL) {
411 pthread_mutex_destroy(&session_list_ptr->lock);
412
413 /* Cleanup ALL session */
414 cds_list_for_each_entry_safe(sess, stmp,
415 &session_list_ptr->head, list) {
416 teardown_kernel_session(sess);
417 teardown_ust_session(sess);
418 free(sess);
419 }
420 }
421
422 DBG("Closing all UST sockets");
423 ust_app_clean_list();
424
425 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
426
427 if (is_root && !opt_no_kernel) {
428 DBG2("Closing kernel fd");
429 if (kernel_tracer_fd >= 0) {
430 ret = close(kernel_tracer_fd);
431 if (ret) {
432 PERROR("close");
433 }
434 }
435 DBG("Unloading kernel modules");
436 modprobe_remove_lttng_all();
437 }
438
439 /*
440 * Closing all pipes used for communication between threads.
441 */
442 for (i = 0; i < 2; i++) {
443 if (kernel_poll_pipe[i] >= 0) {
444 ret = close(kernel_poll_pipe[i]);
445 if (ret) {
446 PERROR("close");
447 }
448
449 }
450 }
451 for (i = 0; i < 2; i++) {
452 if (thread_quit_pipe[i] >= 0) {
453 ret = close(thread_quit_pipe[i]);
454 if (ret) {
455 PERROR("close");
456 }
457 }
458 }
459 for (i = 0; i < 2; i++) {
460 if (apps_cmd_pipe[i] >= 0) {
461 ret = close(apps_cmd_pipe[i]);
462 if (ret) {
463 PERROR("close");
464 }
465 }
466 }
467
468 /* <fun> */
469 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
470 "Matthew, BEET driven development works!%c[%dm",
471 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
472 /* </fun> */
473 }
474
475 /*
476 * Send data on a unix socket using the liblttsessiondcomm API.
477 *
478 * Return lttcomm error code.
479 */
480 static int send_unix_sock(int sock, void *buf, size_t len)
481 {
482 /* Check valid length */
483 if (len <= 0) {
484 return -1;
485 }
486
487 return lttcomm_send_unix_sock(sock, buf, len);
488 }
489
490 /*
491 * Free memory of a command context structure.
492 */
493 static void clean_command_ctx(struct command_ctx **cmd_ctx)
494 {
495 DBG("Clean command context structure");
496 if (*cmd_ctx) {
497 if ((*cmd_ctx)->llm) {
498 free((*cmd_ctx)->llm);
499 }
500 if ((*cmd_ctx)->lsm) {
501 free((*cmd_ctx)->lsm);
502 }
503 free(*cmd_ctx);
504 *cmd_ctx = NULL;
505 }
506 }
507
508 /*
509 * Send all stream fds of kernel channel to the consumer.
510 */
511 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
512 int sock, struct ltt_kernel_channel *channel,
513 uid_t uid, gid_t gid)
514 {
515 int ret;
516 struct ltt_kernel_stream *stream;
517 struct lttcomm_consumer_msg lkm;
518
519 DBG("Sending streams of channel %s to kernel consumer",
520 channel->channel->name);
521
522 /* Send channel */
523 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
524 lkm.u.channel.channel_key = channel->fd;
525 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
526 lkm.u.channel.mmap_len = 0; /* for kernel */
527 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
528 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
529 if (ret < 0) {
530 PERROR("send consumer channel");
531 goto error;
532 }
533
534 /* Send streams */
535 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
536 if (!stream->fd) {
537 continue;
538 }
539 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
540 lkm.u.stream.channel_key = channel->fd;
541 lkm.u.stream.stream_key = stream->fd;
542 lkm.u.stream.state = stream->state;
543 lkm.u.stream.output = channel->channel->attr.output;
544 lkm.u.stream.mmap_len = 0; /* for kernel */
545 lkm.u.stream.uid = uid;
546 lkm.u.stream.gid = gid;
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 PERROR("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 PERROR("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566 error:
567 return ret;
568 }
569
570 /*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575 {
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to -1 at this point */
584 if (session->consumer_fd < 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd >= 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 PERROR("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 lkm.u.stream.uid = session->uid;
609 lkm.u.stream.gid = session->gid;
610 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
611 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
612 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
613 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
614 if (ret < 0) {
615 PERROR("send consumer stream");
616 goto error;
617 }
618 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
619 if (ret < 0) {
620 PERROR("send consumer stream");
621 goto error;
622 }
623 }
624
625 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
626 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
627 session->uid, session->gid);
628 if (ret < 0) {
629 goto error;
630 }
631 }
632
633 DBG("consumer fds (metadata and channel streams) sent");
634
635 return 0;
636
637 error:
638 return ret;
639 }
640
641 /*
642 * Notify UST applications using the shm mmap futex.
643 */
644 static int notify_ust_apps(int active)
645 {
646 char *wait_shm_mmap;
647
648 DBG("Notifying applications of session daemon state: %d", active);
649
650 /* See shm.c for this call implying mmap, shm and futex calls */
651 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
652 if (wait_shm_mmap == NULL) {
653 goto error;
654 }
655
656 /* Wake waiting process */
657 futex_wait_update((int32_t *) wait_shm_mmap, active);
658
659 /* Apps notified successfully */
660 return 0;
661
662 error:
663 return -1;
664 }
665
666 /*
667 * Setup the outgoing data buffer for the response (llm) by allocating the
668 * right amount of memory and copying the original information from the lsm
669 * structure.
670 *
671 * Return total size of the buffer pointed by buf.
672 */
673 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
674 {
675 int ret, buf_size;
676
677 buf_size = size;
678
679 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
680 if (cmd_ctx->llm == NULL) {
681 PERROR("zmalloc");
682 ret = -ENOMEM;
683 goto error;
684 }
685
686 /* Copy common data */
687 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
688 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
689
690 cmd_ctx->llm->data_size = size;
691 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
692
693 return buf_size;
694
695 error:
696 return ret;
697 }
698
699 /*
700 * Update the kernel poll set of all channel fd available over all tracing
701 * session. Add the wakeup pipe at the end of the set.
702 */
703 static int update_kernel_poll(struct lttng_poll_event *events)
704 {
705 int ret;
706 struct ltt_session *session;
707 struct ltt_kernel_channel *channel;
708
709 DBG("Updating kernel poll set");
710
711 session_lock_list();
712 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
713 session_lock(session);
714 if (session->kernel_session == NULL) {
715 session_unlock(session);
716 continue;
717 }
718
719 cds_list_for_each_entry(channel,
720 &session->kernel_session->channel_list.head, list) {
721 /* Add channel fd to the kernel poll set */
722 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
723 if (ret < 0) {
724 session_unlock(session);
725 goto error;
726 }
727 DBG("Channel fd %d added to kernel set", channel->fd);
728 }
729 session_unlock(session);
730 }
731 session_unlock_list();
732
733 return 0;
734
735 error:
736 session_unlock_list();
737 return -1;
738 }
739
740 /*
741 * Find the channel fd from 'fd' over all tracing session. When found, check
742 * for new channel stream and send those stream fds to the kernel consumer.
743 *
744 * Useful for CPU hotplug feature.
745 */
746 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
747 {
748 int ret = 0;
749 struct ltt_session *session;
750 struct ltt_kernel_channel *channel;
751
752 DBG("Updating kernel streams for channel fd %d", fd);
753
754 session_lock_list();
755 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
756 session_lock(session);
757 if (session->kernel_session == NULL) {
758 session_unlock(session);
759 continue;
760 }
761
762 /* This is not suppose to be -1 but this is an extra security check */
763 if (session->kernel_session->consumer_fd < 0) {
764 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
765 }
766
767 cds_list_for_each_entry(channel,
768 &session->kernel_session->channel_list.head, list) {
769 if (channel->fd == fd) {
770 DBG("Channel found, updating kernel streams");
771 ret = kernel_open_channel_stream(channel);
772 if (ret < 0) {
773 goto error;
774 }
775
776 /*
777 * Have we already sent fds to the consumer? If yes, it means
778 * that tracing is started so it is safe to send our updated
779 * stream fds.
780 */
781 if (session->kernel_session->consumer_fds_sent == 1) {
782 ret = send_kconsumer_channel_streams(consumer_data,
783 session->kernel_session->consumer_fd, channel,
784 session->uid, session->gid);
785 if (ret < 0) {
786 goto error;
787 }
788 }
789 goto error;
790 }
791 }
792 session_unlock(session);
793 }
794 session_unlock_list();
795 return ret;
796
797 error:
798 session_unlock(session);
799 session_unlock_list();
800 return ret;
801 }
802
803 /*
804 * For each tracing session, update newly registered apps.
805 */
806 static void update_ust_app(int app_sock)
807 {
808 struct ltt_session *sess, *stmp;
809
810 session_lock_list();
811
812 /* For all tracing session(s) */
813 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
814 session_lock(sess);
815 if (sess->ust_session) {
816 ust_app_global_update(sess->ust_session, app_sock);
817 }
818 session_unlock(sess);
819 }
820
821 session_unlock_list();
822 }
823
824 /*
825 * This thread manage event coming from the kernel.
826 *
827 * Features supported in this thread:
828 * -) CPU Hotplug
829 */
830 static void *thread_manage_kernel(void *data)
831 {
832 int ret, i, pollfd, update_poll_flag = 1;
833 uint32_t revents, nb_fd;
834 char tmp;
835 struct lttng_poll_event events;
836
837 DBG("Thread manage kernel started");
838
839 ret = create_thread_poll_set(&events, 2);
840 if (ret < 0) {
841 goto error_poll_create;
842 }
843
844 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
845 if (ret < 0) {
846 goto error;
847 }
848
849 while (1) {
850 if (update_poll_flag == 1) {
851 /*
852 * Reset number of fd in the poll set. Always 2 since there is the thread
853 * quit pipe and the kernel pipe.
854 */
855 events.nb_fd = 2;
856
857 ret = update_kernel_poll(&events);
858 if (ret < 0) {
859 goto error;
860 }
861 update_poll_flag = 0;
862 }
863
864 nb_fd = LTTNG_POLL_GETNB(&events);
865
866 DBG("Thread kernel polling on %d fds", nb_fd);
867
868 /* Zeroed the poll events */
869 lttng_poll_reset(&events);
870
871 /* Poll infinite value of time */
872 restart:
873 ret = lttng_poll_wait(&events, -1);
874 if (ret < 0) {
875 /*
876 * Restart interrupted system call.
877 */
878 if (errno == EINTR) {
879 goto restart;
880 }
881 goto error;
882 } else if (ret == 0) {
883 /* Should not happen since timeout is infinite */
884 ERR("Return value of poll is 0 with an infinite timeout.\n"
885 "This should not have happened! Continuing...");
886 continue;
887 }
888
889 for (i = 0; i < nb_fd; i++) {
890 /* Fetch once the poll data */
891 revents = LTTNG_POLL_GETEV(&events, i);
892 pollfd = LTTNG_POLL_GETFD(&events, i);
893
894 /* Thread quit pipe has been closed. Killing thread. */
895 ret = check_thread_quit_pipe(pollfd, revents);
896 if (ret) {
897 goto error;
898 }
899
900 /* Check for data on kernel pipe */
901 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
902 ret = read(kernel_poll_pipe[0], &tmp, 1);
903 update_poll_flag = 1;
904 continue;
905 } else {
906 /*
907 * New CPU detected by the kernel. Adding kernel stream to
908 * kernel session and updating the kernel consumer
909 */
910 if (revents & LPOLLIN) {
911 ret = update_kernel_stream(&kconsumer_data, pollfd);
912 if (ret < 0) {
913 continue;
914 }
915 break;
916 /*
917 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
918 * and unregister kernel stream at this point.
919 */
920 }
921 }
922 }
923 }
924
925 error:
926 lttng_poll_clean(&events);
927 error_poll_create:
928 DBG("Kernel thread dying");
929 return NULL;
930 }
931
932 /*
933 * This thread manage the consumer error sent back to the session daemon.
934 */
935 static void *thread_manage_consumer(void *data)
936 {
937 int sock = -1, i, ret, pollfd;
938 uint32_t revents, nb_fd;
939 enum lttcomm_return_code code;
940 struct lttng_poll_event events;
941 struct consumer_data *consumer_data = data;
942
943 DBG("[thread] Manage consumer started");
944
945 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
946 if (ret < 0) {
947 goto error_listen;
948 }
949
950 /*
951 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
952 * Nothing more will be added to this poll set.
953 */
954 ret = create_thread_poll_set(&events, 2);
955 if (ret < 0) {
956 goto error_poll;
957 }
958
959 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
960 if (ret < 0) {
961 goto error;
962 }
963
964 nb_fd = LTTNG_POLL_GETNB(&events);
965
966 /* Inifinite blocking call, waiting for transmission */
967 restart:
968 ret = lttng_poll_wait(&events, -1);
969 if (ret < 0) {
970 /*
971 * Restart interrupted system call.
972 */
973 if (errno == EINTR) {
974 goto restart;
975 }
976 goto error;
977 }
978
979 for (i = 0; i < nb_fd; i++) {
980 /* Fetch once the poll data */
981 revents = LTTNG_POLL_GETEV(&events, i);
982 pollfd = LTTNG_POLL_GETFD(&events, i);
983
984 /* Thread quit pipe has been closed. Killing thread. */
985 ret = check_thread_quit_pipe(pollfd, revents);
986 if (ret) {
987 goto error;
988 }
989
990 /* Event on the registration socket */
991 if (pollfd == consumer_data->err_sock) {
992 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
993 ERR("consumer err socket poll error");
994 goto error;
995 }
996 }
997 }
998
999 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1000 if (sock < 0) {
1001 goto error;
1002 }
1003
1004 DBG2("Receiving code from consumer err_sock");
1005
1006 /* Getting status code from kconsumerd */
1007 ret = lttcomm_recv_unix_sock(sock, &code,
1008 sizeof(enum lttcomm_return_code));
1009 if (ret <= 0) {
1010 goto error;
1011 }
1012
1013 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1014 consumer_data->cmd_sock =
1015 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1016 if (consumer_data->cmd_sock < 0) {
1017 sem_post(&consumer_data->sem);
1018 PERROR("consumer connect");
1019 goto error;
1020 }
1021 /* Signal condition to tell that the kconsumerd is ready */
1022 sem_post(&consumer_data->sem);
1023 DBG("consumer command socket ready");
1024 } else {
1025 ERR("consumer error when waiting for SOCK_READY : %s",
1026 lttcomm_get_readable_code(-code));
1027 goto error;
1028 }
1029
1030 /* Remove the kconsumerd error sock since we've established a connexion */
1031 ret = lttng_poll_del(&events, consumer_data->err_sock);
1032 if (ret < 0) {
1033 goto error;
1034 }
1035
1036 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1037 if (ret < 0) {
1038 goto error;
1039 }
1040
1041 /* Update number of fd */
1042 nb_fd = LTTNG_POLL_GETNB(&events);
1043
1044 /* Inifinite blocking call, waiting for transmission */
1045 restart_poll:
1046 ret = lttng_poll_wait(&events, -1);
1047 if (ret < 0) {
1048 /*
1049 * Restart interrupted system call.
1050 */
1051 if (errno == EINTR) {
1052 goto restart_poll;
1053 }
1054 goto error;
1055 }
1056
1057 for (i = 0; i < nb_fd; i++) {
1058 /* Fetch once the poll data */
1059 revents = LTTNG_POLL_GETEV(&events, i);
1060 pollfd = LTTNG_POLL_GETFD(&events, i);
1061
1062 /* Thread quit pipe has been closed. Killing thread. */
1063 ret = check_thread_quit_pipe(pollfd, revents);
1064 if (ret) {
1065 goto error;
1066 }
1067
1068 /* Event on the kconsumerd socket */
1069 if (pollfd == sock) {
1070 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1071 ERR("consumer err socket second poll error");
1072 goto error;
1073 }
1074 }
1075 }
1076
1077 /* Wait for any kconsumerd error */
1078 ret = lttcomm_recv_unix_sock(sock, &code,
1079 sizeof(enum lttcomm_return_code));
1080 if (ret <= 0) {
1081 ERR("consumer closed the command socket");
1082 goto error;
1083 }
1084
1085 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1086
1087 error:
1088 if (consumer_data->err_sock >= 0) {
1089 ret = close(consumer_data->err_sock);
1090 if (ret) {
1091 PERROR("close");
1092 }
1093 }
1094 if (consumer_data->cmd_sock >= 0) {
1095 ret = close(consumer_data->cmd_sock);
1096 if (ret) {
1097 PERROR("close");
1098 }
1099 }
1100 if (sock >= 0) {
1101 ret = close(sock);
1102 if (ret) {
1103 PERROR("close");
1104 }
1105 }
1106
1107 unlink(consumer_data->err_unix_sock_path);
1108 unlink(consumer_data->cmd_unix_sock_path);
1109 consumer_data->pid = 0;
1110
1111 lttng_poll_clean(&events);
1112 error_poll:
1113 error_listen:
1114 DBG("consumer thread cleanup completed");
1115
1116 return NULL;
1117 }
1118
1119 /*
1120 * This thread manage application communication.
1121 */
1122 static void *thread_manage_apps(void *data)
1123 {
1124 int i, ret, pollfd;
1125 uint32_t revents, nb_fd;
1126 struct ust_command ust_cmd;
1127 struct lttng_poll_event events;
1128
1129 DBG("[thread] Manage application started");
1130
1131 rcu_register_thread();
1132 rcu_thread_online();
1133
1134 ret = create_thread_poll_set(&events, 2);
1135 if (ret < 0) {
1136 goto error_poll_create;
1137 }
1138
1139 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1140 if (ret < 0) {
1141 goto error;
1142 }
1143
1144 while (1) {
1145 /* Zeroed the events structure */
1146 lttng_poll_reset(&events);
1147
1148 nb_fd = LTTNG_POLL_GETNB(&events);
1149
1150 DBG("Apps thread polling on %d fds", nb_fd);
1151
1152 /* Inifinite blocking call, waiting for transmission */
1153 restart:
1154 ret = lttng_poll_wait(&events, -1);
1155 if (ret < 0) {
1156 /*
1157 * Restart interrupted system call.
1158 */
1159 if (errno == EINTR) {
1160 goto restart;
1161 }
1162 goto error;
1163 }
1164
1165 for (i = 0; i < nb_fd; i++) {
1166 /* Fetch once the poll data */
1167 revents = LTTNG_POLL_GETEV(&events, i);
1168 pollfd = LTTNG_POLL_GETFD(&events, i);
1169
1170 /* Thread quit pipe has been closed. Killing thread. */
1171 ret = check_thread_quit_pipe(pollfd, revents);
1172 if (ret) {
1173 goto error;
1174 }
1175
1176 /* Inspect the apps cmd pipe */
1177 if (pollfd == apps_cmd_pipe[0]) {
1178 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1179 ERR("Apps command pipe error");
1180 goto error;
1181 } else if (revents & LPOLLIN) {
1182 /* Empty pipe */
1183 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1184 if (ret < 0 || ret < sizeof(ust_cmd)) {
1185 PERROR("read apps cmd pipe");
1186 goto error;
1187 }
1188
1189 /* Register applicaton to the session daemon */
1190 ret = ust_app_register(&ust_cmd.reg_msg,
1191 ust_cmd.sock);
1192 if (ret == -ENOMEM) {
1193 goto error;
1194 } else if (ret < 0) {
1195 break;
1196 }
1197
1198 /*
1199 * Validate UST version compatibility.
1200 */
1201 ret = ust_app_validate_version(ust_cmd.sock);
1202 if (ret >= 0) {
1203 /*
1204 * Add channel(s) and event(s) to newly registered apps
1205 * from lttng global UST domain.
1206 */
1207 update_ust_app(ust_cmd.sock);
1208 }
1209
1210 ret = ust_app_register_done(ust_cmd.sock);
1211 if (ret < 0) {
1212 /*
1213 * If the registration is not possible, we simply
1214 * unregister the apps and continue
1215 */
1216 ust_app_unregister(ust_cmd.sock);
1217 } else {
1218 /*
1219 * We just need here to monitor the close of the UST
1220 * socket and poll set monitor those by default.
1221 * Listen on POLLIN (even if we never expect any
1222 * data) to ensure that hangup wakes us.
1223 */
1224 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
1225 if (ret < 0) {
1226 goto error;
1227 }
1228
1229 DBG("Apps with sock %d added to poll set",
1230 ust_cmd.sock);
1231 }
1232
1233 break;
1234 }
1235 } else {
1236 /*
1237 * At this point, we know that a registered application made
1238 * the event at poll_wait.
1239 */
1240 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1241 /* Removing from the poll set */
1242 ret = lttng_poll_del(&events, pollfd);
1243 if (ret < 0) {
1244 goto error;
1245 }
1246
1247 /* Socket closed on remote end. */
1248 ust_app_unregister(pollfd);
1249 break;
1250 }
1251 }
1252 }
1253 }
1254
1255 error:
1256 lttng_poll_clean(&events);
1257 error_poll_create:
1258 DBG("Application communication apps thread cleanup complete");
1259 rcu_thread_offline();
1260 rcu_unregister_thread();
1261 return NULL;
1262 }
1263
1264 /*
1265 * Dispatch request from the registration threads to the application
1266 * communication thread.
1267 */
1268 static void *thread_dispatch_ust_registration(void *data)
1269 {
1270 int ret;
1271 struct cds_wfq_node *node;
1272 struct ust_command *ust_cmd = NULL;
1273
1274 DBG("[thread] Dispatch UST command started");
1275
1276 while (!dispatch_thread_exit) {
1277 /* Atomically prepare the queue futex */
1278 futex_nto1_prepare(&ust_cmd_queue.futex);
1279
1280 do {
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 ust_cmd = caa_container_of(node, struct ust_command, node);
1290
1291 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1292 " gid:%d sock:%d name:%s (version %d.%d)",
1293 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1294 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1295 ust_cmd->sock, ust_cmd->reg_msg.name,
1296 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1297 /*
1298 * Inform apps thread of the new application registration. This
1299 * call is blocking so we can be assured that the data will be read
1300 * at some point in time or wait to the end of the world :)
1301 */
1302 ret = write(apps_cmd_pipe[1], ust_cmd,
1303 sizeof(struct ust_command));
1304 if (ret < 0) {
1305 PERROR("write apps cmd pipe");
1306 if (errno == EBADF) {
1307 /*
1308 * We can't inform the application thread to process
1309 * registration. We will exit or else application
1310 * registration will not occur and tracing will never
1311 * start.
1312 */
1313 goto error;
1314 }
1315 }
1316 free(ust_cmd);
1317 } while (node != NULL);
1318
1319 /* Futex wait on queue. Blocking call on futex() */
1320 futex_nto1_wait(&ust_cmd_queue.futex);
1321 }
1322
1323 error:
1324 DBG("Dispatch thread dying");
1325 return NULL;
1326 }
1327
1328 /*
1329 * This thread manage application registration.
1330 */
1331 static void *thread_registration_apps(void *data)
1332 {
1333 int sock = -1, i, ret, pollfd;
1334 uint32_t revents, nb_fd;
1335 struct lttng_poll_event events;
1336 /*
1337 * Get allocated in this thread, enqueued to a global queue, dequeued and
1338 * freed in the manage apps thread.
1339 */
1340 struct ust_command *ust_cmd = NULL;
1341
1342 DBG("[thread] Manage application registration started");
1343
1344 ret = lttcomm_listen_unix_sock(apps_sock);
1345 if (ret < 0) {
1346 goto error_listen;
1347 }
1348
1349 /*
1350 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1351 * more will be added to this poll set.
1352 */
1353 ret = create_thread_poll_set(&events, 2);
1354 if (ret < 0) {
1355 goto error_create_poll;
1356 }
1357
1358 /* Add the application registration socket */
1359 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1360 if (ret < 0) {
1361 goto error_poll_add;
1362 }
1363
1364 /* Notify all applications to register */
1365 ret = notify_ust_apps(1);
1366 if (ret < 0) {
1367 ERR("Failed to notify applications or create the wait shared memory.\n"
1368 "Execution continues but there might be problem for already\n"
1369 "running applications that wishes to register.");
1370 }
1371
1372 while (1) {
1373 DBG("Accepting application registration");
1374
1375 nb_fd = LTTNG_POLL_GETNB(&events);
1376
1377 /* Inifinite blocking call, waiting for transmission */
1378 restart:
1379 ret = lttng_poll_wait(&events, -1);
1380 if (ret < 0) {
1381 /*
1382 * Restart interrupted system call.
1383 */
1384 if (errno == EINTR) {
1385 goto restart;
1386 }
1387 goto error;
1388 }
1389
1390 for (i = 0; i < nb_fd; i++) {
1391 /* Fetch once the poll data */
1392 revents = LTTNG_POLL_GETEV(&events, i);
1393 pollfd = LTTNG_POLL_GETFD(&events, i);
1394
1395 /* Thread quit pipe has been closed. Killing thread. */
1396 ret = check_thread_quit_pipe(pollfd, revents);
1397 if (ret) {
1398 goto error;
1399 }
1400
1401 /* Event on the registration socket */
1402 if (pollfd == apps_sock) {
1403 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1404 ERR("Register apps socket poll error");
1405 goto error;
1406 } else if (revents & LPOLLIN) {
1407 sock = lttcomm_accept_unix_sock(apps_sock);
1408 if (sock < 0) {
1409 goto error;
1410 }
1411
1412 /* Create UST registration command for enqueuing */
1413 ust_cmd = zmalloc(sizeof(struct ust_command));
1414 if (ust_cmd == NULL) {
1415 PERROR("ust command zmalloc");
1416 goto error;
1417 }
1418
1419 /*
1420 * Using message-based transmissions to ensure we don't
1421 * have to deal with partially received messages.
1422 */
1423 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1424 sizeof(struct ust_register_msg));
1425 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1426 if (ret < 0) {
1427 PERROR("lttcomm_recv_unix_sock register apps");
1428 } else {
1429 ERR("Wrong size received on apps register");
1430 }
1431 free(ust_cmd);
1432 ret = close(sock);
1433 if (ret) {
1434 PERROR("close");
1435 }
1436 sock = -1;
1437 continue;
1438 }
1439
1440 ust_cmd->sock = sock;
1441 sock = -1;
1442
1443 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1444 " gid:%d sock:%d name:%s (version %d.%d)",
1445 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1446 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1447 ust_cmd->sock, ust_cmd->reg_msg.name,
1448 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1449
1450 /*
1451 * Lock free enqueue the registration request. The red pill
1452 * has been taken! This apps will be part of the *system*.
1453 */
1454 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1455
1456 /*
1457 * Wake the registration queue futex. Implicit memory
1458 * barrier with the exchange in cds_wfq_enqueue.
1459 */
1460 futex_nto1_wake(&ust_cmd_queue.futex);
1461 }
1462 }
1463 }
1464 }
1465
1466 error:
1467 /* Notify that the registration thread is gone */
1468 notify_ust_apps(0);
1469
1470 if (apps_sock >= 0) {
1471 ret = close(apps_sock);
1472 if (ret) {
1473 PERROR("close");
1474 }
1475 }
1476 if (sock >= 0) {
1477 ret = close(sock);
1478 if (ret) {
1479 PERROR("close");
1480 }
1481 }
1482 unlink(apps_unix_sock_path);
1483
1484 error_poll_add:
1485 lttng_poll_clean(&events);
1486 error_listen:
1487 error_create_poll:
1488 DBG("UST Registration thread cleanup complete");
1489
1490 return NULL;
1491 }
1492
1493 /*
1494 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1495 * exec or it will fails.
1496 */
1497 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1498 {
1499 int ret;
1500 struct timespec timeout;
1501
1502 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1503 timeout.tv_nsec = 0;
1504
1505 /* Setup semaphore */
1506 ret = sem_init(&consumer_data->sem, 0, 0);
1507 if (ret < 0) {
1508 PERROR("sem_init consumer semaphore");
1509 goto error;
1510 }
1511
1512 ret = pthread_create(&consumer_data->thread, NULL,
1513 thread_manage_consumer, consumer_data);
1514 if (ret != 0) {
1515 PERROR("pthread_create consumer");
1516 ret = -1;
1517 goto error;
1518 }
1519
1520 /* Get time for sem_timedwait absolute timeout */
1521 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1522 if (ret < 0) {
1523 PERROR("clock_gettime spawn consumer");
1524 /* Infinite wait for the kconsumerd thread to be ready */
1525 ret = sem_wait(&consumer_data->sem);
1526 } else {
1527 /* Normal timeout if the gettime was successful */
1528 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1529 ret = sem_timedwait(&consumer_data->sem, &timeout);
1530 }
1531
1532 if (ret < 0) {
1533 if (errno == ETIMEDOUT) {
1534 /*
1535 * Call has timed out so we kill the kconsumerd_thread and return
1536 * an error.
1537 */
1538 ERR("The consumer thread was never ready. Killing it");
1539 ret = pthread_cancel(consumer_data->thread);
1540 if (ret < 0) {
1541 PERROR("pthread_cancel consumer thread");
1542 }
1543 } else {
1544 PERROR("semaphore wait failed consumer thread");
1545 }
1546 goto error;
1547 }
1548
1549 pthread_mutex_lock(&consumer_data->pid_mutex);
1550 if (consumer_data->pid == 0) {
1551 ERR("Kconsumerd did not start");
1552 pthread_mutex_unlock(&consumer_data->pid_mutex);
1553 goto error;
1554 }
1555 pthread_mutex_unlock(&consumer_data->pid_mutex);
1556
1557 return 0;
1558
1559 error:
1560 return ret;
1561 }
1562
1563 /*
1564 * Join consumer thread
1565 */
1566 static int join_consumer_thread(struct consumer_data *consumer_data)
1567 {
1568 void *status;
1569 int ret;
1570
1571 if (consumer_data->pid != 0) {
1572 ret = kill(consumer_data->pid, SIGTERM);
1573 if (ret) {
1574 ERR("Error killing consumer daemon");
1575 return ret;
1576 }
1577 return pthread_join(consumer_data->thread, &status);
1578 } else {
1579 return 0;
1580 }
1581 }
1582
1583 /*
1584 * Fork and exec a consumer daemon (consumerd).
1585 *
1586 * Return pid if successful else -1.
1587 */
1588 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1589 {
1590 int ret;
1591 pid_t pid;
1592 const char *consumer_to_use;
1593 const char *verbosity;
1594 struct stat st;
1595
1596 DBG("Spawning consumerd");
1597
1598 pid = fork();
1599 if (pid == 0) {
1600 /*
1601 * Exec consumerd.
1602 */
1603 if (opt_verbose_consumer) {
1604 verbosity = "--verbose";
1605 } else {
1606 verbosity = "--quiet";
1607 }
1608 switch (consumer_data->type) {
1609 case LTTNG_CONSUMER_KERNEL:
1610 /*
1611 * Find out which consumerd to execute. We will first try the
1612 * 64-bit path, then the sessiond's installation directory, and
1613 * fallback on the 32-bit one,
1614 */
1615 DBG3("Looking for a kernel consumer at these locations:");
1616 DBG3(" 1) %s", consumerd64_bin);
1617 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1618 DBG3(" 3) %s", consumerd32_bin);
1619 if (stat(consumerd64_bin, &st) == 0) {
1620 DBG3("Found location #1");
1621 consumer_to_use = consumerd64_bin;
1622 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1623 DBG3("Found location #2");
1624 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1625 } else if (stat(consumerd32_bin, &st) == 0) {
1626 DBG3("Found location #3");
1627 consumer_to_use = consumerd32_bin;
1628 } else {
1629 DBG("Could not find any valid consumerd executable");
1630 break;
1631 }
1632 DBG("Using kernel consumer at: %s", consumer_to_use);
1633 execl(consumer_to_use,
1634 "lttng-consumerd", verbosity, "-k",
1635 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1636 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1637 NULL);
1638 break;
1639 case LTTNG_CONSUMER64_UST:
1640 {
1641 char *tmpnew = NULL;
1642
1643 if (consumerd64_libdir[0] != '\0') {
1644 char *tmp;
1645 size_t tmplen;
1646
1647 tmp = getenv("LD_LIBRARY_PATH");
1648 if (!tmp) {
1649 tmp = "";
1650 }
1651 tmplen = strlen("LD_LIBRARY_PATH=")
1652 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1653 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1654 if (!tmpnew) {
1655 ret = -ENOMEM;
1656 goto error;
1657 }
1658 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1659 strcat(tmpnew, consumerd64_libdir);
1660 if (tmp[0] != '\0') {
1661 strcat(tmpnew, ":");
1662 strcat(tmpnew, tmp);
1663 }
1664 ret = putenv(tmpnew);
1665 if (ret) {
1666 ret = -errno;
1667 goto error;
1668 }
1669 }
1670 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1671 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1672 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1673 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1674 NULL);
1675 if (consumerd64_libdir[0] != '\0') {
1676 free(tmpnew);
1677 }
1678 if (ret) {
1679 goto error;
1680 }
1681 break;
1682 }
1683 case LTTNG_CONSUMER32_UST:
1684 {
1685 char *tmpnew = NULL;
1686
1687 if (consumerd32_libdir[0] != '\0') {
1688 char *tmp;
1689 size_t tmplen;
1690
1691 tmp = getenv("LD_LIBRARY_PATH");
1692 if (!tmp) {
1693 tmp = "";
1694 }
1695 tmplen = strlen("LD_LIBRARY_PATH=")
1696 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1697 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1698 if (!tmpnew) {
1699 ret = -ENOMEM;
1700 goto error;
1701 }
1702 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1703 strcat(tmpnew, consumerd32_libdir);
1704 if (tmp[0] != '\0') {
1705 strcat(tmpnew, ":");
1706 strcat(tmpnew, tmp);
1707 }
1708 ret = putenv(tmpnew);
1709 if (ret) {
1710 ret = -errno;
1711 goto error;
1712 }
1713 }
1714 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1715 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1716 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1717 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1718 NULL);
1719 if (consumerd32_libdir[0] != '\0') {
1720 free(tmpnew);
1721 }
1722 if (ret) {
1723 goto error;
1724 }
1725 break;
1726 }
1727 default:
1728 PERROR("unknown consumer type");
1729 exit(EXIT_FAILURE);
1730 }
1731 if (errno != 0) {
1732 PERROR("kernel start consumer exec");
1733 }
1734 exit(EXIT_FAILURE);
1735 } else if (pid > 0) {
1736 ret = pid;
1737 } else {
1738 PERROR("start consumer fork");
1739 ret = -errno;
1740 }
1741 error:
1742 return ret;
1743 }
1744
1745 /*
1746 * Spawn the consumerd daemon and session daemon thread.
1747 */
1748 static int start_consumerd(struct consumer_data *consumer_data)
1749 {
1750 int ret;
1751
1752 pthread_mutex_lock(&consumer_data->pid_mutex);
1753 if (consumer_data->pid != 0) {
1754 pthread_mutex_unlock(&consumer_data->pid_mutex);
1755 goto end;
1756 }
1757
1758 ret = spawn_consumerd(consumer_data);
1759 if (ret < 0) {
1760 ERR("Spawning consumerd failed");
1761 pthread_mutex_unlock(&consumer_data->pid_mutex);
1762 goto error;
1763 }
1764
1765 /* Setting up the consumer_data pid */
1766 consumer_data->pid = ret;
1767 DBG2("Consumer pid %d", consumer_data->pid);
1768 pthread_mutex_unlock(&consumer_data->pid_mutex);
1769
1770 DBG2("Spawning consumer control thread");
1771 ret = spawn_consumer_thread(consumer_data);
1772 if (ret < 0) {
1773 ERR("Fatal error spawning consumer control thread");
1774 goto error;
1775 }
1776
1777 end:
1778 return 0;
1779
1780 error:
1781 return ret;
1782 }
1783
1784 /*
1785 * Check version of the lttng-modules.
1786 */
1787 static int validate_lttng_modules_version(void)
1788 {
1789 return kernel_validate_version(kernel_tracer_fd);
1790 }
1791
1792 /*
1793 * Setup necessary data for kernel tracer action.
1794 */
1795 static int init_kernel_tracer(void)
1796 {
1797 int ret;
1798
1799 /* Modprobe lttng kernel modules */
1800 ret = modprobe_lttng_control();
1801 if (ret < 0) {
1802 goto error;
1803 }
1804
1805 /* Open debugfs lttng */
1806 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1807 if (kernel_tracer_fd < 0) {
1808 DBG("Failed to open %s", module_proc_lttng);
1809 ret = -1;
1810 goto error_open;
1811 }
1812
1813 /* Validate kernel version */
1814 ret = validate_lttng_modules_version();
1815 if (ret < 0) {
1816 goto error_version;
1817 }
1818
1819 ret = modprobe_lttng_data();
1820 if (ret < 0) {
1821 goto error_modules;
1822 }
1823
1824 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1825 return 0;
1826
1827 error_version:
1828 modprobe_remove_lttng_control();
1829 ret = close(kernel_tracer_fd);
1830 if (ret) {
1831 PERROR("close");
1832 }
1833 kernel_tracer_fd = -1;
1834 return LTTCOMM_KERN_VERSION;
1835
1836 error_modules:
1837 ret = close(kernel_tracer_fd);
1838 if (ret) {
1839 PERROR("close");
1840 }
1841
1842 error_open:
1843 modprobe_remove_lttng_control();
1844
1845 error:
1846 WARN("No kernel tracer available");
1847 kernel_tracer_fd = -1;
1848 return LTTCOMM_KERN_NA;
1849 }
1850
1851 /*
1852 * Init tracing by creating trace directory and sending fds kernel consumer.
1853 */
1854 static int init_kernel_tracing(struct ltt_kernel_session *session)
1855 {
1856 int ret = 0;
1857
1858 if (session->consumer_fds_sent == 0) {
1859 /*
1860 * Assign default kernel consumer socket if no consumer assigned to the
1861 * kernel session. At this point, it's NOT supposed to be -1 but this is
1862 * an extra security check.
1863 */
1864 if (session->consumer_fd < 0) {
1865 session->consumer_fd = kconsumer_data.cmd_sock;
1866 }
1867
1868 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1869 if (ret < 0) {
1870 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1871 goto error;
1872 }
1873
1874 session->consumer_fds_sent = 1;
1875 }
1876
1877 error:
1878 return ret;
1879 }
1880
1881 /*
1882 * Create an UST session and add it to the session ust list.
1883 */
1884 static int create_ust_session(struct ltt_session *session,
1885 struct lttng_domain *domain)
1886 {
1887 struct ltt_ust_session *lus = NULL;
1888 int ret;
1889
1890 switch (domain->type) {
1891 case LTTNG_DOMAIN_UST:
1892 break;
1893 default:
1894 ret = LTTCOMM_UNKNOWN_DOMAIN;
1895 goto error;
1896 }
1897
1898 DBG("Creating UST session");
1899
1900 lus = trace_ust_create_session(session->path, session->id, domain);
1901 if (lus == NULL) {
1902 ret = LTTCOMM_UST_SESS_FAIL;
1903 goto error;
1904 }
1905
1906 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1907 session->uid, session->gid);
1908 if (ret < 0) {
1909 if (ret != -EEXIST) {
1910 ERR("Trace directory creation error");
1911 ret = LTTCOMM_UST_SESS_FAIL;
1912 goto error;
1913 }
1914 }
1915
1916 /* The domain type dictate different actions on session creation */
1917 switch (domain->type) {
1918 case LTTNG_DOMAIN_UST:
1919 /* No ustctl for the global UST domain */
1920 break;
1921 default:
1922 ERR("Unknown UST domain on create session %d", domain->type);
1923 goto error;
1924 }
1925 lus->uid = session->uid;
1926 lus->gid = session->gid;
1927 session->ust_session = lus;
1928
1929 return LTTCOMM_OK;
1930
1931 error:
1932 free(lus);
1933 return ret;
1934 }
1935
1936 /*
1937 * Create a kernel tracer session then create the default channel.
1938 */
1939 static int create_kernel_session(struct ltt_session *session)
1940 {
1941 int ret;
1942
1943 DBG("Creating kernel session");
1944
1945 ret = kernel_create_session(session, kernel_tracer_fd);
1946 if (ret < 0) {
1947 ret = LTTCOMM_KERN_SESS_FAIL;
1948 goto error;
1949 }
1950
1951 /* Set kernel consumer socket fd */
1952 if (kconsumer_data.cmd_sock >= 0) {
1953 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1954 }
1955
1956 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1957 S_IRWXU | S_IRWXG, session->uid, session->gid);
1958 if (ret < 0) {
1959 if (ret != -EEXIST) {
1960 ERR("Trace directory creation error");
1961 goto error;
1962 }
1963 }
1964 session->kernel_session->uid = session->uid;
1965 session->kernel_session->gid = session->gid;
1966
1967 error:
1968 return ret;
1969 }
1970
1971 /*
1972 * Check if the UID or GID match the session. Root user has access to all
1973 * sessions.
1974 */
1975 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1976 {
1977 if (uid != session->uid && gid != session->gid && uid != 0) {
1978 return 0;
1979 } else {
1980 return 1;
1981 }
1982 }
1983
1984 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1985 {
1986 unsigned int i = 0;
1987 struct ltt_session *session;
1988
1989 DBG("Counting number of available session for UID %d GID %d",
1990 uid, gid);
1991 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1992 /*
1993 * Only list the sessions the user can control.
1994 */
1995 if (!session_access_ok(session, uid, gid)) {
1996 continue;
1997 }
1998 i++;
1999 }
2000 return i;
2001 }
2002
2003 /*
2004 * Using the session list, filled a lttng_session array to send back to the
2005 * client for session listing.
2006 *
2007 * The session list lock MUST be acquired before calling this function. Use
2008 * session_lock_list() and session_unlock_list().
2009 */
2010 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2011 gid_t gid)
2012 {
2013 unsigned int i = 0;
2014 struct ltt_session *session;
2015
2016 DBG("Getting all available session for UID %d GID %d",
2017 uid, gid);
2018 /*
2019 * Iterate over session list and append data after the control struct in
2020 * the buffer.
2021 */
2022 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2023 /*
2024 * Only list the sessions the user can control.
2025 */
2026 if (!session_access_ok(session, uid, gid)) {
2027 continue;
2028 }
2029 strncpy(sessions[i].path, session->path, PATH_MAX);
2030 sessions[i].path[PATH_MAX - 1] = '\0';
2031 strncpy(sessions[i].name, session->name, NAME_MAX);
2032 sessions[i].name[NAME_MAX - 1] = '\0';
2033 sessions[i].enabled = session->enabled;
2034 i++;
2035 }
2036 }
2037
2038 /*
2039 * Fill lttng_channel array of all channels.
2040 */
2041 static void list_lttng_channels(int domain, struct ltt_session *session,
2042 struct lttng_channel *channels)
2043 {
2044 int i = 0;
2045 struct ltt_kernel_channel *kchan;
2046
2047 DBG("Listing channels for session %s", session->name);
2048
2049 switch (domain) {
2050 case LTTNG_DOMAIN_KERNEL:
2051 /* Kernel channels */
2052 if (session->kernel_session != NULL) {
2053 cds_list_for_each_entry(kchan,
2054 &session->kernel_session->channel_list.head, list) {
2055 /* Copy lttng_channel struct to array */
2056 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2057 channels[i].enabled = kchan->enabled;
2058 i++;
2059 }
2060 }
2061 break;
2062 case LTTNG_DOMAIN_UST:
2063 {
2064 struct lttng_ht_iter iter;
2065 struct ltt_ust_channel *uchan;
2066
2067 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2068 &iter.iter, uchan, node.node) {
2069 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2070 channels[i].attr.overwrite = uchan->attr.overwrite;
2071 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2072 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2073 channels[i].attr.switch_timer_interval =
2074 uchan->attr.switch_timer_interval;
2075 channels[i].attr.read_timer_interval =
2076 uchan->attr.read_timer_interval;
2077 channels[i].enabled = uchan->enabled;
2078 switch (uchan->attr.output) {
2079 case LTTNG_UST_MMAP:
2080 default:
2081 channels[i].attr.output = LTTNG_EVENT_MMAP;
2082 break;
2083 }
2084 i++;
2085 }
2086 break;
2087 }
2088 default:
2089 break;
2090 }
2091 }
2092
2093 /*
2094 * Create a list of ust global domain events.
2095 */
2096 static int list_lttng_ust_global_events(char *channel_name,
2097 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2098 {
2099 int i = 0, ret = 0;
2100 unsigned int nb_event = 0;
2101 struct lttng_ht_iter iter;
2102 struct lttng_ht_node_str *node;
2103 struct ltt_ust_channel *uchan;
2104 struct ltt_ust_event *uevent;
2105 struct lttng_event *tmp;
2106
2107 DBG("Listing UST global events for channel %s", channel_name);
2108
2109 rcu_read_lock();
2110
2111 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2112 node = lttng_ht_iter_get_node_str(&iter);
2113 if (node == NULL) {
2114 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2115 goto error;
2116 }
2117
2118 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2119
2120 nb_event += lttng_ht_get_count(uchan->events);
2121
2122 if (nb_event == 0) {
2123 ret = nb_event;
2124 goto error;
2125 }
2126
2127 DBG3("Listing UST global %d events", nb_event);
2128
2129 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2130 if (tmp == NULL) {
2131 ret = -LTTCOMM_FATAL;
2132 goto error;
2133 }
2134
2135 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2136 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2137 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2138 tmp[i].enabled = uevent->enabled;
2139 switch (uevent->attr.instrumentation) {
2140 case LTTNG_UST_TRACEPOINT:
2141 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2142 break;
2143 case LTTNG_UST_PROBE:
2144 tmp[i].type = LTTNG_EVENT_PROBE;
2145 break;
2146 case LTTNG_UST_FUNCTION:
2147 tmp[i].type = LTTNG_EVENT_FUNCTION;
2148 break;
2149 }
2150 tmp[i].loglevel = uevent->attr.loglevel;
2151 switch (uevent->attr.loglevel_type) {
2152 case LTTNG_UST_LOGLEVEL_ALL:
2153 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2154 break;
2155 case LTTNG_UST_LOGLEVEL_RANGE:
2156 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2157 break;
2158 case LTTNG_UST_LOGLEVEL_SINGLE:
2159 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2160 break;
2161 }
2162 i++;
2163 }
2164
2165 ret = nb_event;
2166 *events = tmp;
2167
2168 error:
2169 rcu_read_unlock();
2170 return ret;
2171 }
2172
2173 /*
2174 * Fill lttng_event array of all kernel events in the channel.
2175 */
2176 static int list_lttng_kernel_events(char *channel_name,
2177 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2178 {
2179 int i = 0, ret;
2180 unsigned int nb_event;
2181 struct ltt_kernel_event *event;
2182 struct ltt_kernel_channel *kchan;
2183
2184 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2185 if (kchan == NULL) {
2186 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2187 goto error;
2188 }
2189
2190 nb_event = kchan->event_count;
2191
2192 DBG("Listing events for channel %s", kchan->channel->name);
2193
2194 if (nb_event == 0) {
2195 ret = nb_event;
2196 goto error;
2197 }
2198
2199 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2200 if (*events == NULL) {
2201 ret = LTTCOMM_FATAL;
2202 goto error;
2203 }
2204
2205 /* Kernel channels */
2206 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2207 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2208 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2209 (*events)[i].enabled = event->enabled;
2210 switch (event->event->instrumentation) {
2211 case LTTNG_KERNEL_TRACEPOINT:
2212 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2213 break;
2214 case LTTNG_KERNEL_KPROBE:
2215 case LTTNG_KERNEL_KRETPROBE:
2216 (*events)[i].type = LTTNG_EVENT_PROBE;
2217 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2218 sizeof(struct lttng_kernel_kprobe));
2219 break;
2220 case LTTNG_KERNEL_FUNCTION:
2221 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2222 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2223 sizeof(struct lttng_kernel_function));
2224 break;
2225 case LTTNG_KERNEL_NOOP:
2226 (*events)[i].type = LTTNG_EVENT_NOOP;
2227 break;
2228 case LTTNG_KERNEL_SYSCALL:
2229 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2230 break;
2231 case LTTNG_KERNEL_ALL:
2232 assert(0);
2233 break;
2234 }
2235 i++;
2236 }
2237
2238 return nb_event;
2239
2240 error:
2241 return ret;
2242 }
2243
2244 /*
2245 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2246 */
2247 static int cmd_disable_channel(struct ltt_session *session,
2248 int domain, char *channel_name)
2249 {
2250 int ret;
2251 struct ltt_ust_session *usess;
2252
2253 usess = session->ust_session;
2254
2255 switch (domain) {
2256 case LTTNG_DOMAIN_KERNEL:
2257 {
2258 ret = channel_kernel_disable(session->kernel_session,
2259 channel_name);
2260 if (ret != LTTCOMM_OK) {
2261 goto error;
2262 }
2263
2264 kernel_wait_quiescent(kernel_tracer_fd);
2265 break;
2266 }
2267 case LTTNG_DOMAIN_UST:
2268 {
2269 struct ltt_ust_channel *uchan;
2270 struct lttng_ht *chan_ht;
2271
2272 chan_ht = usess->domain_global.channels;
2273
2274 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2275 if (uchan == NULL) {
2276 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2277 goto error;
2278 }
2279
2280 ret = channel_ust_disable(usess, domain, uchan);
2281 if (ret != LTTCOMM_OK) {
2282 goto error;
2283 }
2284 break;
2285 }
2286 #if 0
2287 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2288 case LTTNG_DOMAIN_UST_EXEC_NAME:
2289 case LTTNG_DOMAIN_UST_PID:
2290 #endif
2291 default:
2292 ret = LTTCOMM_UNKNOWN_DOMAIN;
2293 goto error;
2294 }
2295
2296 ret = LTTCOMM_OK;
2297
2298 error:
2299 return ret;
2300 }
2301
2302 /*
2303 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2304 */
2305 static int cmd_enable_channel(struct ltt_session *session,
2306 int domain, struct lttng_channel *attr)
2307 {
2308 int ret;
2309 struct ltt_ust_session *usess = session->ust_session;
2310 struct lttng_ht *chan_ht;
2311
2312 DBG("Enabling channel %s for session %s", attr->name, session->name);
2313
2314 switch (domain) {
2315 case LTTNG_DOMAIN_KERNEL:
2316 {
2317 struct ltt_kernel_channel *kchan;
2318
2319 kchan = trace_kernel_get_channel_by_name(attr->name,
2320 session->kernel_session);
2321 if (kchan == NULL) {
2322 ret = channel_kernel_create(session->kernel_session,
2323 attr, kernel_poll_pipe[1]);
2324 } else {
2325 ret = channel_kernel_enable(session->kernel_session, kchan);
2326 }
2327
2328 if (ret != LTTCOMM_OK) {
2329 goto error;
2330 }
2331
2332 kernel_wait_quiescent(kernel_tracer_fd);
2333 break;
2334 }
2335 case LTTNG_DOMAIN_UST:
2336 {
2337 struct ltt_ust_channel *uchan;
2338
2339 chan_ht = usess->domain_global.channels;
2340
2341 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2342 if (uchan == NULL) {
2343 ret = channel_ust_create(usess, domain, attr);
2344 } else {
2345 ret = channel_ust_enable(usess, domain, uchan);
2346 }
2347 break;
2348 }
2349 #if 0
2350 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2351 case LTTNG_DOMAIN_UST_EXEC_NAME:
2352 case LTTNG_DOMAIN_UST_PID:
2353 #endif
2354 default:
2355 ret = LTTCOMM_UNKNOWN_DOMAIN;
2356 goto error;
2357 }
2358
2359 error:
2360 return ret;
2361 }
2362
2363 /*
2364 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2365 */
2366 static int cmd_disable_event(struct ltt_session *session, int domain,
2367 char *channel_name, char *event_name)
2368 {
2369 int ret;
2370
2371 switch (domain) {
2372 case LTTNG_DOMAIN_KERNEL:
2373 {
2374 struct ltt_kernel_channel *kchan;
2375 struct ltt_kernel_session *ksess;
2376
2377 ksess = session->kernel_session;
2378
2379 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2380 if (kchan == NULL) {
2381 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2382 goto error;
2383 }
2384
2385 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2386 if (ret != LTTCOMM_OK) {
2387 goto error;
2388 }
2389
2390 kernel_wait_quiescent(kernel_tracer_fd);
2391 break;
2392 }
2393 case LTTNG_DOMAIN_UST:
2394 {
2395 struct ltt_ust_channel *uchan;
2396 struct ltt_ust_session *usess;
2397
2398 usess = session->ust_session;
2399
2400 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2401 channel_name);
2402 if (uchan == NULL) {
2403 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2404 goto error;
2405 }
2406
2407 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2408 if (ret != LTTCOMM_OK) {
2409 goto error;
2410 }
2411
2412 DBG3("Disable UST event %s in channel %s completed", event_name,
2413 channel_name);
2414 break;
2415 }
2416 #if 0
2417 case LTTNG_DOMAIN_UST_EXEC_NAME:
2418 case LTTNG_DOMAIN_UST_PID:
2419 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2420 #endif
2421 default:
2422 ret = LTTCOMM_UND;
2423 goto error;
2424 }
2425
2426 ret = LTTCOMM_OK;
2427
2428 error:
2429 return ret;
2430 }
2431
2432 /*
2433 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2434 */
2435 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2436 char *channel_name)
2437 {
2438 int ret;
2439
2440 switch (domain) {
2441 case LTTNG_DOMAIN_KERNEL:
2442 {
2443 struct ltt_kernel_session *ksess;
2444 struct ltt_kernel_channel *kchan;
2445
2446 ksess = session->kernel_session;
2447
2448 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2449 if (kchan == NULL) {
2450 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2451 goto error;
2452 }
2453
2454 ret = event_kernel_disable_all(ksess, kchan);
2455 if (ret != LTTCOMM_OK) {
2456 goto error;
2457 }
2458
2459 kernel_wait_quiescent(kernel_tracer_fd);
2460 break;
2461 }
2462 case LTTNG_DOMAIN_UST:
2463 {
2464 struct ltt_ust_session *usess;
2465 struct ltt_ust_channel *uchan;
2466
2467 usess = session->ust_session;
2468
2469 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2470 channel_name);
2471 if (uchan == NULL) {
2472 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2473 goto error;
2474 }
2475
2476 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2477 if (ret != 0) {
2478 goto error;
2479 }
2480
2481 DBG3("Disable all UST events in channel %s completed", channel_name);
2482
2483 break;
2484 }
2485 #if 0
2486 case LTTNG_DOMAIN_UST_EXEC_NAME:
2487 case LTTNG_DOMAIN_UST_PID:
2488 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2489 #endif
2490 default:
2491 ret = LTTCOMM_UND;
2492 goto error;
2493 }
2494
2495 ret = LTTCOMM_OK;
2496
2497 error:
2498 return ret;
2499 }
2500
2501 /*
2502 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2503 */
2504 static int cmd_add_context(struct ltt_session *session, int domain,
2505 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2506 {
2507 int ret;
2508
2509 switch (domain) {
2510 case LTTNG_DOMAIN_KERNEL:
2511 /* Add kernel context to kernel tracer */
2512 ret = context_kernel_add(session->kernel_session, ctx,
2513 event_name, channel_name);
2514 if (ret != LTTCOMM_OK) {
2515 goto error;
2516 }
2517 break;
2518 case LTTNG_DOMAIN_UST:
2519 {
2520 struct ltt_ust_session *usess = session->ust_session;
2521
2522 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2523 if (ret != LTTCOMM_OK) {
2524 goto error;
2525 }
2526 break;
2527 }
2528 #if 0
2529 case LTTNG_DOMAIN_UST_EXEC_NAME:
2530 case LTTNG_DOMAIN_UST_PID:
2531 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2532 #endif
2533 default:
2534 ret = LTTCOMM_UND;
2535 goto error;
2536 }
2537
2538 ret = LTTCOMM_OK;
2539
2540 error:
2541 return ret;
2542 }
2543
2544 /*
2545 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2546 */
2547 static int cmd_enable_event(struct ltt_session *session, int domain,
2548 char *channel_name, struct lttng_event *event)
2549 {
2550 int ret;
2551 struct lttng_channel *attr;
2552 struct ltt_ust_session *usess = session->ust_session;
2553
2554 switch (domain) {
2555 case LTTNG_DOMAIN_KERNEL:
2556 {
2557 struct ltt_kernel_channel *kchan;
2558
2559 kchan = trace_kernel_get_channel_by_name(channel_name,
2560 session->kernel_session);
2561 if (kchan == NULL) {
2562 attr = channel_new_default_attr(domain);
2563 if (attr == NULL) {
2564 ret = LTTCOMM_FATAL;
2565 goto error;
2566 }
2567 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2568
2569 /* This call will notify the kernel thread */
2570 ret = channel_kernel_create(session->kernel_session,
2571 attr, kernel_poll_pipe[1]);
2572 if (ret != LTTCOMM_OK) {
2573 free(attr);
2574 goto error;
2575 }
2576 free(attr);
2577 }
2578
2579 /* Get the newly created kernel channel pointer */
2580 kchan = trace_kernel_get_channel_by_name(channel_name,
2581 session->kernel_session);
2582 if (kchan == NULL) {
2583 /* This sould not happen... */
2584 ret = LTTCOMM_FATAL;
2585 goto error;
2586 }
2587
2588 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2589 event);
2590 if (ret != LTTCOMM_OK) {
2591 goto error;
2592 }
2593
2594 kernel_wait_quiescent(kernel_tracer_fd);
2595 break;
2596 }
2597 case LTTNG_DOMAIN_UST:
2598 {
2599 struct lttng_channel *attr;
2600 struct ltt_ust_channel *uchan;
2601
2602 /* Get channel from global UST domain */
2603 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2604 channel_name);
2605 if (uchan == NULL) {
2606 /* Create default channel */
2607 attr = channel_new_default_attr(domain);
2608 if (attr == NULL) {
2609 ret = LTTCOMM_FATAL;
2610 goto error;
2611 }
2612 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2613 attr->name[NAME_MAX - 1] = '\0';
2614
2615 ret = channel_ust_create(usess, domain, attr);
2616 if (ret != LTTCOMM_OK) {
2617 free(attr);
2618 goto error;
2619 }
2620 free(attr);
2621
2622 /* Get the newly created channel reference back */
2623 uchan = trace_ust_find_channel_by_name(
2624 usess->domain_global.channels, channel_name);
2625 if (uchan == NULL) {
2626 /* Something is really wrong */
2627 ret = LTTCOMM_FATAL;
2628 goto error;
2629 }
2630 }
2631
2632 /* At this point, the session and channel exist on the tracer */
2633 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2634 if (ret != LTTCOMM_OK) {
2635 goto error;
2636 }
2637 break;
2638 }
2639 #if 0
2640 case LTTNG_DOMAIN_UST_EXEC_NAME:
2641 case LTTNG_DOMAIN_UST_PID:
2642 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2643 #endif
2644 default:
2645 ret = LTTCOMM_UND;
2646 goto error;
2647 }
2648
2649 ret = LTTCOMM_OK;
2650
2651 error:
2652 return ret;
2653 }
2654
2655 /*
2656 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2657 */
2658 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2659 char *channel_name, int event_type)
2660 {
2661 int ret;
2662 struct ltt_kernel_channel *kchan;
2663
2664 switch (domain) {
2665 case LTTNG_DOMAIN_KERNEL:
2666 kchan = trace_kernel_get_channel_by_name(channel_name,
2667 session->kernel_session);
2668 if (kchan == NULL) {
2669 /* This call will notify the kernel thread */
2670 ret = channel_kernel_create(session->kernel_session, NULL,
2671 kernel_poll_pipe[1]);
2672 if (ret != LTTCOMM_OK) {
2673 goto error;
2674 }
2675
2676 /* Get the newly created kernel channel pointer */
2677 kchan = trace_kernel_get_channel_by_name(channel_name,
2678 session->kernel_session);
2679 if (kchan == NULL) {
2680 /* This sould not happen... */
2681 ret = LTTCOMM_FATAL;
2682 goto error;
2683 }
2684
2685 }
2686
2687 switch (event_type) {
2688 case LTTNG_EVENT_SYSCALL:
2689 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2690 kchan, kernel_tracer_fd);
2691 break;
2692 case LTTNG_EVENT_TRACEPOINT:
2693 /*
2694 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2695 * events already registered to the channel.
2696 */
2697 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2698 kchan, kernel_tracer_fd);
2699 break;
2700 case LTTNG_EVENT_ALL:
2701 /* Enable syscalls and tracepoints */
2702 ret = event_kernel_enable_all(session->kernel_session,
2703 kchan, kernel_tracer_fd);
2704 break;
2705 default:
2706 ret = LTTCOMM_KERN_ENABLE_FAIL;
2707 goto error;
2708 }
2709
2710 /* Manage return value */
2711 if (ret != LTTCOMM_OK) {
2712 goto error;
2713 }
2714
2715 kernel_wait_quiescent(kernel_tracer_fd);
2716 break;
2717 case LTTNG_DOMAIN_UST:
2718 {
2719 struct lttng_channel *attr;
2720 struct ltt_ust_channel *uchan;
2721 struct ltt_ust_session *usess = session->ust_session;
2722
2723 /* Get channel from global UST domain */
2724 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2725 channel_name);
2726 if (uchan == NULL) {
2727 /* Create default channel */
2728 attr = channel_new_default_attr(domain);
2729 if (attr == NULL) {
2730 ret = LTTCOMM_FATAL;
2731 goto error;
2732 }
2733 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2734 attr->name[NAME_MAX - 1] = '\0';
2735
2736 /* Use the internal command enable channel */
2737 ret = channel_ust_create(usess, domain, attr);
2738 if (ret != LTTCOMM_OK) {
2739 free(attr);
2740 goto error;
2741 }
2742 free(attr);
2743
2744 /* Get the newly created channel reference back */
2745 uchan = trace_ust_find_channel_by_name(
2746 usess->domain_global.channels, channel_name);
2747 if (uchan == NULL) {
2748 /* Something is really wrong */
2749 ret = LTTCOMM_FATAL;
2750 goto error;
2751 }
2752 }
2753
2754 /* At this point, the session and channel exist on the tracer */
2755
2756 switch (event_type) {
2757 case LTTNG_EVENT_ALL:
2758 case LTTNG_EVENT_TRACEPOINT:
2759 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2760 if (ret != LTTCOMM_OK) {
2761 goto error;
2762 }
2763 break;
2764 default:
2765 ret = LTTCOMM_UST_ENABLE_FAIL;
2766 goto error;
2767 }
2768
2769 /* Manage return value */
2770 if (ret != LTTCOMM_OK) {
2771 goto error;
2772 }
2773
2774 break;
2775 }
2776 #if 0
2777 case LTTNG_DOMAIN_UST_EXEC_NAME:
2778 case LTTNG_DOMAIN_UST_PID:
2779 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2780 #endif
2781 default:
2782 ret = LTTCOMM_UND;
2783 goto error;
2784 }
2785
2786 ret = LTTCOMM_OK;
2787
2788 error:
2789 return ret;
2790 }
2791
2792 /*
2793 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2794 */
2795 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2796 {
2797 int ret;
2798 ssize_t nb_events = 0;
2799
2800 switch (domain) {
2801 case LTTNG_DOMAIN_KERNEL:
2802 nb_events = kernel_list_events(kernel_tracer_fd, events);
2803 if (nb_events < 0) {
2804 ret = LTTCOMM_KERN_LIST_FAIL;
2805 goto error;
2806 }
2807 break;
2808 case LTTNG_DOMAIN_UST:
2809 nb_events = ust_app_list_events(events);
2810 if (nb_events < 0) {
2811 ret = LTTCOMM_UST_LIST_FAIL;
2812 goto error;
2813 }
2814 break;
2815 default:
2816 ret = LTTCOMM_UND;
2817 goto error;
2818 }
2819
2820 return nb_events;
2821
2822 error:
2823 /* Return negative value to differentiate return code */
2824 return -ret;
2825 }
2826
2827 /*
2828 * Command LTTNG_START_TRACE processed by the client thread.
2829 */
2830 static int cmd_start_trace(struct ltt_session *session)
2831 {
2832 int ret;
2833 struct ltt_kernel_session *ksession;
2834 struct ltt_ust_session *usess;
2835
2836 /* Short cut */
2837 ksession = session->kernel_session;
2838 usess = session->ust_session;
2839
2840 if (session->enabled) {
2841 ret = LTTCOMM_UST_START_FAIL;
2842 goto error;
2843 }
2844
2845 session->enabled = 1;
2846
2847 /* Kernel tracing */
2848 if (ksession != NULL) {
2849 struct ltt_kernel_channel *kchan;
2850
2851 /* Open kernel metadata */
2852 if (ksession->metadata == NULL) {
2853 ret = kernel_open_metadata(ksession, ksession->trace_path);
2854 if (ret < 0) {
2855 ret = LTTCOMM_KERN_META_FAIL;
2856 goto error;
2857 }
2858 }
2859
2860 /* Open kernel metadata stream */
2861 if (ksession->metadata_stream_fd < 0) {
2862 ret = kernel_open_metadata_stream(ksession);
2863 if (ret < 0) {
2864 ERR("Kernel create metadata stream failed");
2865 ret = LTTCOMM_KERN_STREAM_FAIL;
2866 goto error;
2867 }
2868 }
2869
2870 /* For each channel */
2871 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2872 if (kchan->stream_count == 0) {
2873 ret = kernel_open_channel_stream(kchan);
2874 if (ret < 0) {
2875 ret = LTTCOMM_KERN_STREAM_FAIL;
2876 goto error;
2877 }
2878 /* Update the stream global counter */
2879 ksession->stream_count_global += ret;
2880 }
2881 }
2882
2883 /* Setup kernel consumer socket and send fds to it */
2884 ret = init_kernel_tracing(ksession);
2885 if (ret < 0) {
2886 ret = LTTCOMM_KERN_START_FAIL;
2887 goto error;
2888 }
2889
2890 /* This start the kernel tracing */
2891 ret = kernel_start_session(ksession);
2892 if (ret < 0) {
2893 ret = LTTCOMM_KERN_START_FAIL;
2894 goto error;
2895 }
2896
2897 /* Quiescent wait after starting trace */
2898 kernel_wait_quiescent(kernel_tracer_fd);
2899 }
2900
2901 /* Flag session that trace should start automatically */
2902 if (usess) {
2903 usess->start_trace = 1;
2904
2905 ret = ust_app_start_trace_all(usess);
2906 if (ret < 0) {
2907 ret = LTTCOMM_UST_START_FAIL;
2908 goto error;
2909 }
2910 }
2911
2912 ret = LTTCOMM_OK;
2913
2914 error:
2915 return ret;
2916 }
2917
2918 /*
2919 * Command LTTNG_STOP_TRACE processed by the client thread.
2920 */
2921 static int cmd_stop_trace(struct ltt_session *session)
2922 {
2923 int ret;
2924 struct ltt_kernel_channel *kchan;
2925 struct ltt_kernel_session *ksession;
2926 struct ltt_ust_session *usess;
2927
2928 /* Short cut */
2929 ksession = session->kernel_session;
2930 usess = session->ust_session;
2931
2932 if (!session->enabled) {
2933 ret = LTTCOMM_UST_STOP_FAIL;
2934 goto error;
2935 }
2936
2937 session->enabled = 0;
2938
2939 /* Kernel tracer */
2940 if (ksession != NULL) {
2941 DBG("Stop kernel tracing");
2942
2943 /* Flush all buffers before stopping */
2944 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2945 if (ret < 0) {
2946 ERR("Kernel metadata flush failed");
2947 }
2948
2949 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2950 ret = kernel_flush_buffer(kchan);
2951 if (ret < 0) {
2952 ERR("Kernel flush buffer error");
2953 }
2954 }
2955
2956 ret = kernel_stop_session(ksession);
2957 if (ret < 0) {
2958 ret = LTTCOMM_KERN_STOP_FAIL;
2959 goto error;
2960 }
2961
2962 kernel_wait_quiescent(kernel_tracer_fd);
2963 }
2964
2965 if (usess) {
2966 usess->start_trace = 0;
2967
2968 ret = ust_app_stop_trace_all(usess);
2969 if (ret < 0) {
2970 ret = LTTCOMM_UST_STOP_FAIL;
2971 goto error;
2972 }
2973 }
2974
2975 ret = LTTCOMM_OK;
2976
2977 error:
2978 return ret;
2979 }
2980
2981 /*
2982 * Command LTTNG_CREATE_SESSION processed by the client thread.
2983 */
2984 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2985 {
2986 int ret;
2987
2988 ret = session_create(name, path, creds->uid, creds->gid);
2989 if (ret != LTTCOMM_OK) {
2990 goto error;
2991 }
2992
2993 ret = LTTCOMM_OK;
2994
2995 error:
2996 return ret;
2997 }
2998
2999 /*
3000 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3001 */
3002 static int cmd_destroy_session(struct ltt_session *session, char *name)
3003 {
3004 int ret;
3005
3006 /* Clean kernel session teardown */
3007 teardown_kernel_session(session);
3008 /* UST session teardown */
3009 teardown_ust_session(session);
3010
3011 /*
3012 * Must notify the kernel thread here to update it's poll setin order
3013 * to remove the channel(s)' fd just destroyed.
3014 */
3015 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3016 if (ret < 0) {
3017 PERROR("write kernel poll pipe");
3018 }
3019
3020 ret = session_destroy(session);
3021
3022 return ret;
3023 }
3024
3025 /*
3026 * Command LTTNG_CALIBRATE processed by the client thread.
3027 */
3028 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3029 {
3030 int ret;
3031
3032 switch (domain) {
3033 case LTTNG_DOMAIN_KERNEL:
3034 {
3035 struct lttng_kernel_calibrate kcalibrate;
3036
3037 kcalibrate.type = calibrate->type;
3038 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3039 if (ret < 0) {
3040 ret = LTTCOMM_KERN_ENABLE_FAIL;
3041 goto error;
3042 }
3043 break;
3044 }
3045 case LTTNG_DOMAIN_UST:
3046 {
3047 struct lttng_ust_calibrate ucalibrate;
3048
3049 ucalibrate.type = calibrate->type;
3050 ret = ust_app_calibrate_glb(&ucalibrate);
3051 if (ret < 0) {
3052 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3053 goto error;
3054 }
3055 break;
3056 }
3057 default:
3058 ret = LTTCOMM_UND;
3059 goto error;
3060 }
3061
3062 ret = LTTCOMM_OK;
3063
3064 error:
3065 return ret;
3066 }
3067
3068 /*
3069 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3070 */
3071 static int cmd_register_consumer(struct ltt_session *session, int domain,
3072 char *sock_path)
3073 {
3074 int ret, sock;
3075
3076 switch (domain) {
3077 case LTTNG_DOMAIN_KERNEL:
3078 /* Can't register a consumer if there is already one */
3079 if (session->kernel_session->consumer_fds_sent != 0) {
3080 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3081 goto error;
3082 }
3083
3084 sock = lttcomm_connect_unix_sock(sock_path);
3085 if (sock < 0) {
3086 ret = LTTCOMM_CONNECT_FAIL;
3087 goto error;
3088 }
3089
3090 session->kernel_session->consumer_fd = sock;
3091 break;
3092 default:
3093 /* TODO: Userspace tracing */
3094 ret = LTTCOMM_UND;
3095 goto error;
3096 }
3097
3098 ret = LTTCOMM_OK;
3099
3100 error:
3101 return ret;
3102 }
3103
3104 /*
3105 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3106 */
3107 static ssize_t cmd_list_domains(struct ltt_session *session,
3108 struct lttng_domain **domains)
3109 {
3110 int ret, index = 0;
3111 ssize_t nb_dom = 0;
3112
3113 if (session->kernel_session != NULL) {
3114 DBG3("Listing domains found kernel domain");
3115 nb_dom++;
3116 }
3117
3118 if (session->ust_session != NULL) {
3119 DBG3("Listing domains found UST global domain");
3120 nb_dom++;
3121 }
3122
3123 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3124 if (*domains == NULL) {
3125 ret = -LTTCOMM_FATAL;
3126 goto error;
3127 }
3128
3129 if (session->kernel_session != NULL) {
3130 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3131 index++;
3132 }
3133
3134 if (session->ust_session != NULL) {
3135 (*domains)[index].type = LTTNG_DOMAIN_UST;
3136 index++;
3137 }
3138
3139 return nb_dom;
3140
3141 error:
3142 return ret;
3143 }
3144
3145 /*
3146 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3147 */
3148 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3149 struct lttng_channel **channels)
3150 {
3151 int ret;
3152 ssize_t nb_chan = 0;
3153
3154 switch (domain) {
3155 case LTTNG_DOMAIN_KERNEL:
3156 if (session->kernel_session != NULL) {
3157 nb_chan = session->kernel_session->channel_count;
3158 }
3159 DBG3("Number of kernel channels %zd", nb_chan);
3160 break;
3161 case LTTNG_DOMAIN_UST:
3162 if (session->ust_session != NULL) {
3163 nb_chan = lttng_ht_get_count(
3164 session->ust_session->domain_global.channels);
3165 }
3166 DBG3("Number of UST global channels %zd", nb_chan);
3167 break;
3168 default:
3169 *channels = NULL;
3170 ret = -LTTCOMM_UND;
3171 goto error;
3172 }
3173
3174 if (nb_chan > 0) {
3175 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3176 if (*channels == NULL) {
3177 ret = -LTTCOMM_FATAL;
3178 goto error;
3179 }
3180
3181 list_lttng_channels(domain, session, *channels);
3182 } else {
3183 *channels = NULL;
3184 }
3185
3186 return nb_chan;
3187
3188 error:
3189 return ret;
3190 }
3191
3192 /*
3193 * Command LTTNG_LIST_EVENTS processed by the client thread.
3194 */
3195 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3196 char *channel_name, struct lttng_event **events)
3197 {
3198 int ret = 0;
3199 ssize_t nb_event = 0;
3200
3201 switch (domain) {
3202 case LTTNG_DOMAIN_KERNEL:
3203 if (session->kernel_session != NULL) {
3204 nb_event = list_lttng_kernel_events(channel_name,
3205 session->kernel_session, events);
3206 }
3207 break;
3208 case LTTNG_DOMAIN_UST:
3209 {
3210 if (session->ust_session != NULL) {
3211 nb_event = list_lttng_ust_global_events(channel_name,
3212 &session->ust_session->domain_global, events);
3213 }
3214 break;
3215 }
3216 default:
3217 ret = -LTTCOMM_UND;
3218 goto error;
3219 }
3220
3221 ret = nb_event;
3222
3223 error:
3224 return ret;
3225 }
3226
3227 /*
3228 * Process the command requested by the lttng client within the command
3229 * context structure. This function make sure that the return structure (llm)
3230 * is set and ready for transmission before returning.
3231 *
3232 * Return any error encountered or 0 for success.
3233 */
3234 static int process_client_msg(struct command_ctx *cmd_ctx)
3235 {
3236 int ret = LTTCOMM_OK;
3237 int need_tracing_session = 1;
3238 int need_domain;
3239
3240 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3241
3242 switch (cmd_ctx->lsm->cmd_type) {
3243 case LTTNG_CREATE_SESSION:
3244 case LTTNG_DESTROY_SESSION:
3245 case LTTNG_LIST_SESSIONS:
3246 case LTTNG_LIST_DOMAINS:
3247 case LTTNG_START_TRACE:
3248 case LTTNG_STOP_TRACE:
3249 need_domain = 0;
3250 break;
3251 default:
3252 need_domain = 1;
3253 }
3254
3255 if (opt_no_kernel && need_domain
3256 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3257 ret = LTTCOMM_KERN_NA;
3258 goto error;
3259 }
3260
3261 /*
3262 * Check for command that don't needs to allocate a returned payload. We do
3263 * this here so we don't have to make the call for no payload at each
3264 * command.
3265 */
3266 switch(cmd_ctx->lsm->cmd_type) {
3267 case LTTNG_LIST_SESSIONS:
3268 case LTTNG_LIST_TRACEPOINTS:
3269 case LTTNG_LIST_DOMAINS:
3270 case LTTNG_LIST_CHANNELS:
3271 case LTTNG_LIST_EVENTS:
3272 break;
3273 default:
3274 /* Setup lttng message with no payload */
3275 ret = setup_lttng_msg(cmd_ctx, 0);
3276 if (ret < 0) {
3277 /* This label does not try to unlock the session */
3278 goto init_setup_error;
3279 }
3280 }
3281
3282 /* Commands that DO NOT need a session. */
3283 switch (cmd_ctx->lsm->cmd_type) {
3284 case LTTNG_CREATE_SESSION:
3285 case LTTNG_CALIBRATE:
3286 case LTTNG_LIST_SESSIONS:
3287 case LTTNG_LIST_TRACEPOINTS:
3288 need_tracing_session = 0;
3289 break;
3290 default:
3291 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3292 session_lock_list();
3293 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3294 session_unlock_list();
3295 if (cmd_ctx->session == NULL) {
3296 if (cmd_ctx->lsm->session.name != NULL) {
3297 ret = LTTCOMM_SESS_NOT_FOUND;
3298 } else {
3299 /* If no session name specified */
3300 ret = LTTCOMM_SELECT_SESS;
3301 }
3302 goto error;
3303 } else {
3304 /* Acquire lock for the session */
3305 session_lock(cmd_ctx->session);
3306 }
3307 break;
3308 }
3309
3310 if (!need_domain) {
3311 goto skip_domain;
3312 }
3313 /*
3314 * Check domain type for specific "pre-action".
3315 */
3316 switch (cmd_ctx->lsm->domain.type) {
3317 case LTTNG_DOMAIN_KERNEL:
3318 if (!is_root) {
3319 ret = LTTCOMM_KERN_NA;
3320 goto error;
3321 }
3322
3323 /* Kernel tracer check */
3324 if (kernel_tracer_fd == -1) {
3325 /* Basically, load kernel tracer modules */
3326 ret = init_kernel_tracer();
3327 if (ret != 0) {
3328 goto error;
3329 }
3330 }
3331
3332 /* Need a session for kernel command */
3333 if (need_tracing_session) {
3334 if (cmd_ctx->session->kernel_session == NULL) {
3335 ret = create_kernel_session(cmd_ctx->session);
3336 if (ret < 0) {
3337 ret = LTTCOMM_KERN_SESS_FAIL;
3338 goto error;
3339 }
3340 }
3341
3342 /* Start the kernel consumer daemon */
3343 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3344 if (kconsumer_data.pid == 0 &&
3345 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3346 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3347 ret = start_consumerd(&kconsumer_data);
3348 if (ret < 0) {
3349 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3350 goto error;
3351 }
3352 } else {
3353 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3354 }
3355 }
3356 break;
3357 case LTTNG_DOMAIN_UST:
3358 {
3359 if (need_tracing_session) {
3360 if (cmd_ctx->session->ust_session == NULL) {
3361 ret = create_ust_session(cmd_ctx->session,
3362 &cmd_ctx->lsm->domain);
3363 if (ret != LTTCOMM_OK) {
3364 goto error;
3365 }
3366 }
3367 /* Start the UST consumer daemons */
3368 /* 64-bit */
3369 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3370 if (consumerd64_bin[0] != '\0' &&
3371 ustconsumer64_data.pid == 0 &&
3372 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3373 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3374 ret = start_consumerd(&ustconsumer64_data);
3375 if (ret < 0) {
3376 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3377 ust_consumerd64_fd = -EINVAL;
3378 goto error;
3379 }
3380
3381 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3382 } else {
3383 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3384 }
3385 /* 32-bit */
3386 if (consumerd32_bin[0] != '\0' &&
3387 ustconsumer32_data.pid == 0 &&
3388 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3389 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3390 ret = start_consumerd(&ustconsumer32_data);
3391 if (ret < 0) {
3392 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3393 ust_consumerd32_fd = -EINVAL;
3394 goto error;
3395 }
3396 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3397 } else {
3398 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3399 }
3400 }
3401 break;
3402 }
3403 default:
3404 break;
3405 }
3406 skip_domain:
3407
3408 /*
3409 * Check that the UID or GID match that of the tracing session.
3410 * The root user can interact with all sessions.
3411 */
3412 if (need_tracing_session) {
3413 if (!session_access_ok(cmd_ctx->session,
3414 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3415 ret = LTTCOMM_EPERM;
3416 goto error;
3417 }
3418 }
3419
3420 /* Process by command type */
3421 switch (cmd_ctx->lsm->cmd_type) {
3422 case LTTNG_ADD_CONTEXT:
3423 {
3424 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3425 cmd_ctx->lsm->u.context.channel_name,
3426 cmd_ctx->lsm->u.context.event_name,
3427 &cmd_ctx->lsm->u.context.ctx);
3428 break;
3429 }
3430 case LTTNG_DISABLE_CHANNEL:
3431 {
3432 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3433 cmd_ctx->lsm->u.disable.channel_name);
3434 break;
3435 }
3436 case LTTNG_DISABLE_EVENT:
3437 {
3438 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3439 cmd_ctx->lsm->u.disable.channel_name,
3440 cmd_ctx->lsm->u.disable.name);
3441 break;
3442 }
3443 case LTTNG_DISABLE_ALL_EVENT:
3444 {
3445 DBG("Disabling all events");
3446
3447 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3448 cmd_ctx->lsm->u.disable.channel_name);
3449 break;
3450 }
3451 case LTTNG_ENABLE_CHANNEL:
3452 {
3453 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3454 &cmd_ctx->lsm->u.channel.chan);
3455 break;
3456 }
3457 case LTTNG_ENABLE_EVENT:
3458 {
3459 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3460 cmd_ctx->lsm->u.enable.channel_name,
3461 &cmd_ctx->lsm->u.enable.event);
3462 break;
3463 }
3464 case LTTNG_ENABLE_ALL_EVENT:
3465 {
3466 DBG("Enabling all events");
3467
3468 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3469 cmd_ctx->lsm->u.enable.channel_name,
3470 cmd_ctx->lsm->u.enable.event.type);
3471 break;
3472 }
3473 case LTTNG_LIST_TRACEPOINTS:
3474 {
3475 struct lttng_event *events;
3476 ssize_t nb_events;
3477
3478 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3479 if (nb_events < 0) {
3480 ret = -nb_events;
3481 goto error;
3482 }
3483
3484 /*
3485 * Setup lttng message with payload size set to the event list size in
3486 * bytes and then copy list into the llm payload.
3487 */
3488 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3489 if (ret < 0) {
3490 free(events);
3491 goto setup_error;
3492 }
3493
3494 /* Copy event list into message payload */
3495 memcpy(cmd_ctx->llm->payload, events,
3496 sizeof(struct lttng_event) * nb_events);
3497
3498 free(events);
3499
3500 ret = LTTCOMM_OK;
3501 break;
3502 }
3503 case LTTNG_START_TRACE:
3504 {
3505 ret = cmd_start_trace(cmd_ctx->session);
3506 break;
3507 }
3508 case LTTNG_STOP_TRACE:
3509 {
3510 ret = cmd_stop_trace(cmd_ctx->session);
3511 break;
3512 }
3513 case LTTNG_CREATE_SESSION:
3514 {
3515 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3516 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3517 break;
3518 }
3519 case LTTNG_DESTROY_SESSION:
3520 {
3521 ret = cmd_destroy_session(cmd_ctx->session,
3522 cmd_ctx->lsm->session.name);
3523 break;
3524 }
3525 case LTTNG_LIST_DOMAINS:
3526 {
3527 ssize_t nb_dom;
3528 struct lttng_domain *domains;
3529
3530 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3531 if (nb_dom < 0) {
3532 ret = -nb_dom;
3533 goto error;
3534 }
3535
3536 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3537 if (ret < 0) {
3538 goto setup_error;
3539 }
3540
3541 /* Copy event list into message payload */
3542 memcpy(cmd_ctx->llm->payload, domains,
3543 nb_dom * sizeof(struct lttng_domain));
3544
3545 free(domains);
3546
3547 ret = LTTCOMM_OK;
3548 break;
3549 }
3550 case LTTNG_LIST_CHANNELS:
3551 {
3552 size_t nb_chan;
3553 struct lttng_channel *channels;
3554
3555 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3556 cmd_ctx->session, &channels);
3557 if (nb_chan < 0) {
3558 ret = -nb_chan;
3559 goto error;
3560 }
3561
3562 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3563 if (ret < 0) {
3564 goto setup_error;
3565 }
3566
3567 /* Copy event list into message payload */
3568 memcpy(cmd_ctx->llm->payload, channels,
3569 nb_chan * sizeof(struct lttng_channel));
3570
3571 free(channels);
3572
3573 ret = LTTCOMM_OK;
3574 break;
3575 }
3576 case LTTNG_LIST_EVENTS:
3577 {
3578 ssize_t nb_event;
3579 struct lttng_event *events = NULL;
3580
3581 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3582 cmd_ctx->lsm->u.list.channel_name, &events);
3583 if (nb_event < 0) {
3584 ret = -nb_event;
3585 goto error;
3586 }
3587
3588 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3589 if (ret < 0) {
3590 goto setup_error;
3591 }
3592
3593 /* Copy event list into message payload */
3594 memcpy(cmd_ctx->llm->payload, events,
3595 nb_event * sizeof(struct lttng_event));
3596
3597 free(events);
3598
3599 ret = LTTCOMM_OK;
3600 break;
3601 }
3602 case LTTNG_LIST_SESSIONS:
3603 {
3604 unsigned int nr_sessions;
3605
3606 session_lock_list();
3607 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3608
3609 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3610 if (ret < 0) {
3611 session_unlock_list();
3612 goto setup_error;
3613 }
3614
3615 /* Filled the session array */
3616 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3617 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3618
3619 session_unlock_list();
3620
3621 ret = LTTCOMM_OK;
3622 break;
3623 }
3624 case LTTNG_CALIBRATE:
3625 {
3626 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3627 &cmd_ctx->lsm->u.calibrate);
3628 break;
3629 }
3630 case LTTNG_REGISTER_CONSUMER:
3631 {
3632 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3633 cmd_ctx->lsm->u.reg.path);
3634 break;
3635 }
3636 default:
3637 ret = LTTCOMM_UND;
3638 break;
3639 }
3640
3641 error:
3642 if (cmd_ctx->llm == NULL) {
3643 DBG("Missing llm structure. Allocating one.");
3644 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3645 goto setup_error;
3646 }
3647 }
3648 /* Set return code */
3649 cmd_ctx->llm->ret_code = ret;
3650 setup_error:
3651 if (cmd_ctx->session) {
3652 session_unlock(cmd_ctx->session);
3653 }
3654 init_setup_error:
3655 return ret;
3656 }
3657
3658 /*
3659 * This thread manage all clients request using the unix client socket for
3660 * communication.
3661 */
3662 static void *thread_manage_clients(void *data)
3663 {
3664 int sock = -1, ret, i, pollfd;
3665 uint32_t revents, nb_fd;
3666 struct command_ctx *cmd_ctx = NULL;
3667 struct lttng_poll_event events;
3668
3669 DBG("[thread] Manage client started");
3670
3671 rcu_register_thread();
3672
3673 ret = lttcomm_listen_unix_sock(client_sock);
3674 if (ret < 0) {
3675 goto error;
3676 }
3677
3678 /*
3679 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3680 * more will be added to this poll set.
3681 */
3682 ret = create_thread_poll_set(&events, 2);
3683 if (ret < 0) {
3684 goto error;
3685 }
3686
3687 /* Add the application registration socket */
3688 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3689 if (ret < 0) {
3690 goto error;
3691 }
3692
3693 /*
3694 * Notify parent pid that we are ready to accept command for client side.
3695 */
3696 if (opt_sig_parent) {
3697 kill(ppid, SIGUSR1);
3698 }
3699
3700 while (1) {
3701 DBG("Accepting client command ...");
3702
3703 nb_fd = LTTNG_POLL_GETNB(&events);
3704
3705 /* Inifinite blocking call, waiting for transmission */
3706 restart:
3707 ret = lttng_poll_wait(&events, -1);
3708 if (ret < 0) {
3709 /*
3710 * Restart interrupted system call.
3711 */
3712 if (errno == EINTR) {
3713 goto restart;
3714 }
3715 goto error;
3716 }
3717
3718 for (i = 0; i < nb_fd; i++) {
3719 /* Fetch once the poll data */
3720 revents = LTTNG_POLL_GETEV(&events, i);
3721 pollfd = LTTNG_POLL_GETFD(&events, i);
3722
3723 /* Thread quit pipe has been closed. Killing thread. */
3724 ret = check_thread_quit_pipe(pollfd, revents);
3725 if (ret) {
3726 goto error;
3727 }
3728
3729 /* Event on the registration socket */
3730 if (pollfd == client_sock) {
3731 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3732 ERR("Client socket poll error");
3733 goto error;
3734 }
3735 }
3736 }
3737
3738 DBG("Wait for client response");
3739
3740 sock = lttcomm_accept_unix_sock(client_sock);
3741 if (sock < 0) {
3742 goto error;
3743 }
3744
3745 /* Set socket option for credentials retrieval */
3746 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3747 if (ret < 0) {
3748 goto error;
3749 }
3750
3751 /* Allocate context command to process the client request */
3752 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3753 if (cmd_ctx == NULL) {
3754 PERROR("zmalloc cmd_ctx");
3755 goto error;
3756 }
3757
3758 /* Allocate data buffer for reception */
3759 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3760 if (cmd_ctx->lsm == NULL) {
3761 PERROR("zmalloc cmd_ctx->lsm");
3762 goto error;
3763 }
3764
3765 cmd_ctx->llm = NULL;
3766 cmd_ctx->session = NULL;
3767
3768 /*
3769 * Data is received from the lttng client. The struct
3770 * lttcomm_session_msg (lsm) contains the command and data request of
3771 * the client.
3772 */
3773 DBG("Receiving data from client ...");
3774 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3775 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3776 if (ret <= 0) {
3777 DBG("Nothing recv() from client... continuing");
3778 ret = close(sock);
3779 if (ret) {
3780 PERROR("close");
3781 }
3782 sock = -1;
3783 free(cmd_ctx);
3784 continue;
3785 }
3786
3787 // TODO: Validate cmd_ctx including sanity check for
3788 // security purpose.
3789
3790 rcu_thread_online();
3791 /*
3792 * This function dispatch the work to the kernel or userspace tracer
3793 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3794 * informations for the client. The command context struct contains
3795 * everything this function may needs.
3796 */
3797 ret = process_client_msg(cmd_ctx);
3798 rcu_thread_offline();
3799 if (ret < 0) {
3800 /*
3801 * TODO: Inform client somehow of the fatal error. At
3802 * this point, ret < 0 means that a zmalloc failed
3803 * (ENOMEM). Error detected but still accept command.
3804 */
3805 clean_command_ctx(&cmd_ctx);
3806 continue;
3807 }
3808
3809 DBG("Sending response (size: %d, retcode: %s)",
3810 cmd_ctx->lttng_msg_size,
3811 lttng_strerror(-cmd_ctx->llm->ret_code));
3812 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3813 if (ret < 0) {
3814 ERR("Failed to send data back to client");
3815 }
3816
3817 /* End of transmission */
3818 ret = close(sock);
3819 if (ret) {
3820 PERROR("close");
3821 }
3822 sock = -1;
3823
3824 clean_command_ctx(&cmd_ctx);
3825 }
3826
3827 error:
3828 DBG("Client thread dying");
3829 unlink(client_unix_sock_path);
3830 if (client_sock >= 0) {
3831 ret = close(client_sock);
3832 if (ret) {
3833 PERROR("close");
3834 }
3835 }
3836 if (sock >= 0) {
3837 ret = close(sock);
3838 if (ret) {
3839 PERROR("close");
3840 }
3841 }
3842
3843 lttng_poll_clean(&events);
3844 clean_command_ctx(&cmd_ctx);
3845
3846 rcu_unregister_thread();
3847 return NULL;
3848 }
3849
3850
3851 /*
3852 * usage function on stderr
3853 */
3854 static void usage(void)
3855 {
3856 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3857 fprintf(stderr, " -h, --help Display this usage.\n");
3858 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3859 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3860 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3861 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3862 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3863 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3864 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3865 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3866 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3867 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3868 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3869 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3870 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3871 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3872 fprintf(stderr, " -V, --version Show version number.\n");
3873 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3874 fprintf(stderr, " -q, --quiet No output at all.\n");
3875 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3876 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3877 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3878 }
3879
3880 /*
3881 * daemon argument parsing
3882 */
3883 static int parse_args(int argc, char **argv)
3884 {
3885 int c;
3886
3887 static struct option long_options[] = {
3888 { "client-sock", 1, 0, 'c' },
3889 { "apps-sock", 1, 0, 'a' },
3890 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3891 { "kconsumerd-err-sock", 1, 0, 'E' },
3892 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3893 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3894 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3895 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3896 { "consumerd32-path", 1, 0, 'u' },
3897 { "consumerd32-libdir", 1, 0, 'U' },
3898 { "consumerd64-path", 1, 0, 't' },
3899 { "consumerd64-libdir", 1, 0, 'T' },
3900 { "daemonize", 0, 0, 'd' },
3901 { "sig-parent", 0, 0, 'S' },
3902 { "help", 0, 0, 'h' },
3903 { "group", 1, 0, 'g' },
3904 { "version", 0, 0, 'V' },
3905 { "quiet", 0, 0, 'q' },
3906 { "verbose", 0, 0, 'v' },
3907 { "verbose-consumer", 0, 0, 'Z' },
3908 { "no-kernel", 0, 0, 'N' },
3909 { NULL, 0, 0, 0 }
3910 };
3911
3912 while (1) {
3913 int option_index = 0;
3914 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3915 long_options, &option_index);
3916 if (c == -1) {
3917 break;
3918 }
3919
3920 switch (c) {
3921 case 0:
3922 fprintf(stderr, "option %s", long_options[option_index].name);
3923 if (optarg) {
3924 fprintf(stderr, " with arg %s\n", optarg);
3925 }
3926 break;
3927 case 'c':
3928 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3929 break;
3930 case 'a':
3931 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3932 break;
3933 case 'd':
3934 opt_daemon = 1;
3935 break;
3936 case 'g':
3937 opt_tracing_group = optarg;
3938 break;
3939 case 'h':
3940 usage();
3941 exit(EXIT_FAILURE);
3942 case 'V':
3943 fprintf(stdout, "%s\n", VERSION);
3944 exit(EXIT_SUCCESS);
3945 case 'S':
3946 opt_sig_parent = 1;
3947 break;
3948 case 'E':
3949 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3950 break;
3951 case 'C':
3952 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3953 break;
3954 case 'F':
3955 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3956 break;
3957 case 'D':
3958 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3959 break;
3960 case 'H':
3961 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3962 break;
3963 case 'G':
3964 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3965 break;
3966 case 'N':
3967 opt_no_kernel = 1;
3968 break;
3969 case 'q':
3970 opt_quiet = 1;
3971 break;
3972 case 'v':
3973 /* Verbose level can increase using multiple -v */
3974 opt_verbose += 1;
3975 break;
3976 case 'Z':
3977 opt_verbose_consumer += 1;
3978 break;
3979 case 'u':
3980 consumerd32_bin= optarg;
3981 break;
3982 case 'U':
3983 consumerd32_libdir = optarg;
3984 break;
3985 case 't':
3986 consumerd64_bin = optarg;
3987 break;
3988 case 'T':
3989 consumerd64_libdir = optarg;
3990 break;
3991 default:
3992 /* Unknown option or other error.
3993 * Error is printed by getopt, just return */
3994 return -1;
3995 }
3996 }
3997
3998 return 0;
3999 }
4000
4001 /*
4002 * Creates the two needed socket by the daemon.
4003 * apps_sock - The communication socket for all UST apps.
4004 * client_sock - The communication of the cli tool (lttng).
4005 */
4006 static int init_daemon_socket(void)
4007 {
4008 int ret = 0;
4009 mode_t old_umask;
4010
4011 old_umask = umask(0);
4012
4013 /* Create client tool unix socket */
4014 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4015 if (client_sock < 0) {
4016 ERR("Create unix sock failed: %s", client_unix_sock_path);
4017 ret = -1;
4018 goto end;
4019 }
4020
4021 /* File permission MUST be 660 */
4022 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4023 if (ret < 0) {
4024 ERR("Set file permissions failed: %s", client_unix_sock_path);
4025 PERROR("chmod");
4026 goto end;
4027 }
4028
4029 /* Create the application unix socket */
4030 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4031 if (apps_sock < 0) {
4032 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4033 ret = -1;
4034 goto end;
4035 }
4036
4037 /* File permission MUST be 666 */
4038 ret = chmod(apps_unix_sock_path,
4039 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4040 if (ret < 0) {
4041 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4042 PERROR("chmod");
4043 goto end;
4044 }
4045
4046 end:
4047 umask(old_umask);
4048 return ret;
4049 }
4050
4051 /*
4052 * Check if the global socket is available, and if a daemon is answering at the
4053 * other side. If yes, error is returned.
4054 */
4055 static int check_existing_daemon(void)
4056 {
4057 /* Is there anybody out there ? */
4058 if (lttng_session_daemon_alive()) {
4059 return -EEXIST;
4060 }
4061
4062 return 0;
4063 }
4064
4065 /*
4066 * Set the tracing group gid onto the client socket.
4067 *
4068 * Race window between mkdir and chown is OK because we are going from more
4069 * permissive (root.root) to less permissive (root.tracing).
4070 */
4071 static int set_permissions(char *rundir)
4072 {
4073 int ret;
4074 gid_t gid;
4075
4076 gid = allowed_group();
4077 if (gid < 0) {
4078 WARN("No tracing group detected");
4079 ret = 0;
4080 goto end;
4081 }
4082
4083 /* Set lttng run dir */
4084 ret = chown(rundir, 0, gid);
4085 if (ret < 0) {
4086 ERR("Unable to set group on %s", rundir);
4087 PERROR("chown");
4088 }
4089
4090 /* Ensure tracing group can search the run dir */
4091 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
4092 if (ret < 0) {
4093 ERR("Unable to set permissions on %s", rundir);
4094 PERROR("chmod");
4095 }
4096
4097 /* lttng client socket path */
4098 ret = chown(client_unix_sock_path, 0, gid);
4099 if (ret < 0) {
4100 ERR("Unable to set group on %s", client_unix_sock_path);
4101 PERROR("chown");
4102 }
4103
4104 /* kconsumer error socket path */
4105 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4106 if (ret < 0) {
4107 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4108 PERROR("chown");
4109 }
4110
4111 /* 64-bit ustconsumer error socket path */
4112 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4113 if (ret < 0) {
4114 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4115 PERROR("chown");
4116 }
4117
4118 /* 32-bit ustconsumer compat32 error socket path */
4119 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4120 if (ret < 0) {
4121 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4122 PERROR("chown");
4123 }
4124
4125 DBG("All permissions are set");
4126
4127 end:
4128 return ret;
4129 }
4130
4131 /*
4132 * Create the pipe used to wake up the kernel thread.
4133 * Closed in cleanup().
4134 */
4135 static int create_kernel_poll_pipe(void)
4136 {
4137 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4138 }
4139
4140 /*
4141 * Create the application command pipe to wake thread_manage_apps.
4142 * Closed in cleanup().
4143 */
4144 static int create_apps_cmd_pipe(void)
4145 {
4146 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4147 }
4148
4149 /*
4150 * Create the lttng run directory needed for all global sockets and pipe.
4151 */
4152 static int create_lttng_rundir(const char *rundir)
4153 {
4154 int ret;
4155
4156 DBG3("Creating LTTng run directory: %s", rundir);
4157
4158 ret = mkdir(rundir, S_IRWXU);
4159 if (ret < 0) {
4160 if (errno != EEXIST) {
4161 ERR("Unable to create %s", rundir);
4162 goto error;
4163 } else {
4164 ret = 0;
4165 }
4166 }
4167
4168 error:
4169 return ret;
4170 }
4171
4172 /*
4173 * Setup sockets and directory needed by the kconsumerd communication with the
4174 * session daemon.
4175 */
4176 static int set_consumer_sockets(struct consumer_data *consumer_data,
4177 const char *rundir)
4178 {
4179 int ret;
4180 char path[PATH_MAX];
4181
4182 switch (consumer_data->type) {
4183 case LTTNG_CONSUMER_KERNEL:
4184 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4185 break;
4186 case LTTNG_CONSUMER64_UST:
4187 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4188 break;
4189 case LTTNG_CONSUMER32_UST:
4190 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4191 break;
4192 default:
4193 ERR("Consumer type unknown");
4194 ret = -EINVAL;
4195 goto error;
4196 }
4197
4198 DBG2("Creating consumer directory: %s", path);
4199
4200 ret = mkdir(path, S_IRWXU);
4201 if (ret < 0) {
4202 if (errno != EEXIST) {
4203 ERR("Failed to create %s", path);
4204 goto error;
4205 }
4206 ret = 0;
4207 }
4208
4209 /* Create the kconsumerd error unix socket */
4210 consumer_data->err_sock =
4211 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4212 if (consumer_data->err_sock < 0) {
4213 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4214 ret = -1;
4215 goto error;
4216 }
4217
4218 /* File permission MUST be 660 */
4219 ret = chmod(consumer_data->err_unix_sock_path,
4220 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4221 if (ret < 0) {
4222 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4223 PERROR("chmod");
4224 goto error;
4225 }
4226
4227 error:
4228 return ret;
4229 }
4230
4231 /*
4232 * Signal handler for the daemon
4233 *
4234 * Simply stop all worker threads, leaving main() return gracefully after
4235 * joining all threads and calling cleanup().
4236 */
4237 static void sighandler(int sig)
4238 {
4239 switch (sig) {
4240 case SIGPIPE:
4241 DBG("SIGPIPE caught");
4242 return;
4243 case SIGINT:
4244 DBG("SIGINT caught");
4245 stop_threads();
4246 break;
4247 case SIGTERM:
4248 DBG("SIGTERM caught");
4249 stop_threads();
4250 break;
4251 default:
4252 break;
4253 }
4254 }
4255
4256 /*
4257 * Setup signal handler for :
4258 * SIGINT, SIGTERM, SIGPIPE
4259 */
4260 static int set_signal_handler(void)
4261 {
4262 int ret = 0;
4263 struct sigaction sa;
4264 sigset_t sigset;
4265
4266 if ((ret = sigemptyset(&sigset)) < 0) {
4267 PERROR("sigemptyset");
4268 return ret;
4269 }
4270
4271 sa.sa_handler = sighandler;
4272 sa.sa_mask = sigset;
4273 sa.sa_flags = 0;
4274 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4275 PERROR("sigaction");
4276 return ret;
4277 }
4278
4279 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4280 PERROR("sigaction");
4281 return ret;
4282 }
4283
4284 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4285 PERROR("sigaction");
4286 return ret;
4287 }
4288
4289 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4290
4291 return ret;
4292 }
4293
4294 /*
4295 * Set open files limit to unlimited. This daemon can open a large number of
4296 * file descriptors in order to consumer multiple kernel traces.
4297 */
4298 static void set_ulimit(void)
4299 {
4300 int ret;
4301 struct rlimit lim;
4302
4303 /* The kernel does not allowed an infinite limit for open files */
4304 lim.rlim_cur = 65535;
4305 lim.rlim_max = 65535;
4306
4307 ret = setrlimit(RLIMIT_NOFILE, &lim);
4308 if (ret < 0) {
4309 PERROR("failed to set open files limit");
4310 }
4311 }
4312
4313 /*
4314 * main
4315 */
4316 int main(int argc, char **argv)
4317 {
4318 int ret = 0;
4319 void *status;
4320 const char *home_path;
4321
4322 init_kernel_workarounds();
4323
4324 rcu_register_thread();
4325
4326 /* Create thread quit pipe */
4327 if ((ret = init_thread_quit_pipe()) < 0) {
4328 goto error;
4329 }
4330
4331 setup_consumerd_path();
4332
4333 /* Parse arguments */
4334 progname = argv[0];
4335 if ((ret = parse_args(argc, argv) < 0)) {
4336 goto error;
4337 }
4338
4339 /* Daemonize */
4340 if (opt_daemon) {
4341 ret = daemon(0, 0);
4342 if (ret < 0) {
4343 PERROR("daemon");
4344 goto error;
4345 }
4346 }
4347
4348 /* Check if daemon is UID = 0 */
4349 is_root = !getuid();
4350
4351 if (is_root) {
4352 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4353
4354 /* Create global run dir with root access */
4355 ret = create_lttng_rundir(rundir);
4356 if (ret < 0) {
4357 goto error;
4358 }
4359
4360 if (strlen(apps_unix_sock_path) == 0) {
4361 snprintf(apps_unix_sock_path, PATH_MAX,
4362 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4363 }
4364
4365 if (strlen(client_unix_sock_path) == 0) {
4366 snprintf(client_unix_sock_path, PATH_MAX,
4367 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4368 }
4369
4370 /* Set global SHM for ust */
4371 if (strlen(wait_shm_path) == 0) {
4372 snprintf(wait_shm_path, PATH_MAX,
4373 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4374 }
4375
4376 /* Setup kernel consumerd path */
4377 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4378 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4379 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4380 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4381
4382 DBG2("Kernel consumer err path: %s",
4383 kconsumer_data.err_unix_sock_path);
4384 DBG2("Kernel consumer cmd path: %s",
4385 kconsumer_data.cmd_unix_sock_path);
4386 } else {
4387 home_path = get_home_dir();
4388 if (home_path == NULL) {
4389 /* TODO: Add --socket PATH option */
4390 ERR("Can't get HOME directory for sockets creation.");
4391 ret = -EPERM;
4392 goto error;
4393 }
4394
4395 /*
4396 * Create rundir from home path. This will create something like
4397 * $HOME/.lttng
4398 */
4399 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4400 if (ret < 0) {
4401 ret = -ENOMEM;
4402 goto error;
4403 }
4404
4405 ret = create_lttng_rundir(rundir);
4406 if (ret < 0) {
4407 goto error;
4408 }
4409
4410 if (strlen(apps_unix_sock_path) == 0) {
4411 snprintf(apps_unix_sock_path, PATH_MAX,
4412 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4413 }
4414
4415 /* Set the cli tool unix socket path */
4416 if (strlen(client_unix_sock_path) == 0) {
4417 snprintf(client_unix_sock_path, PATH_MAX,
4418 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4419 }
4420
4421 /* Set global SHM for ust */
4422 if (strlen(wait_shm_path) == 0) {
4423 snprintf(wait_shm_path, PATH_MAX,
4424 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4425 }
4426 }
4427
4428 DBG("Client socket path %s", client_unix_sock_path);
4429 DBG("Application socket path %s", apps_unix_sock_path);
4430 DBG("LTTng run directory path: %s", rundir);
4431
4432 /* 32 bits consumerd path setup */
4433 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4434 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4435 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4436 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4437
4438 DBG2("UST consumer 32 bits err path: %s",
4439 ustconsumer32_data.err_unix_sock_path);
4440 DBG2("UST consumer 32 bits cmd path: %s",
4441 ustconsumer32_data.cmd_unix_sock_path);
4442
4443 /* 64 bits consumerd path setup */
4444 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4445 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4446 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4447 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4448
4449 DBG2("UST consumer 64 bits err path: %s",
4450 ustconsumer64_data.err_unix_sock_path);
4451 DBG2("UST consumer 64 bits cmd path: %s",
4452 ustconsumer64_data.cmd_unix_sock_path);
4453
4454 /*
4455 * See if daemon already exist.
4456 */
4457 if ((ret = check_existing_daemon()) < 0) {
4458 ERR("Already running daemon.\n");
4459 /*
4460 * We do not goto exit because we must not cleanup()
4461 * because a daemon is already running.
4462 */
4463 goto error;
4464 }
4465
4466 /* After this point, we can safely call cleanup() with "goto exit" */
4467
4468 /*
4469 * These actions must be executed as root. We do that *after* setting up
4470 * the sockets path because we MUST make the check for another daemon using
4471 * those paths *before* trying to set the kernel consumer sockets and init
4472 * kernel tracer.
4473 */
4474 if (is_root) {
4475 ret = set_consumer_sockets(&kconsumer_data, rundir);
4476 if (ret < 0) {
4477 goto exit;
4478 }
4479
4480 /* Setup kernel tracer */
4481 if (!opt_no_kernel) {
4482 init_kernel_tracer();
4483 }
4484
4485 /* Set ulimit for open files */
4486 set_ulimit();
4487 }
4488
4489 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4490 if (ret < 0) {
4491 goto exit;
4492 }
4493
4494 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4495 if (ret < 0) {
4496 goto exit;
4497 }
4498
4499 if ((ret = set_signal_handler()) < 0) {
4500 goto exit;
4501 }
4502
4503 /* Setup the needed unix socket */
4504 if ((ret = init_daemon_socket()) < 0) {
4505 goto exit;
4506 }
4507
4508 /* Set credentials to socket */
4509 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4510 goto exit;
4511 }
4512
4513 /* Get parent pid if -S, --sig-parent is specified. */
4514 if (opt_sig_parent) {
4515 ppid = getppid();
4516 }
4517
4518 /* Setup the kernel pipe for waking up the kernel thread */
4519 if ((ret = create_kernel_poll_pipe()) < 0) {
4520 goto exit;
4521 }
4522
4523 /* Setup the thread apps communication pipe. */
4524 if ((ret = create_apps_cmd_pipe()) < 0) {
4525 goto exit;
4526 }
4527
4528 /* Init UST command queue. */
4529 cds_wfq_init(&ust_cmd_queue.queue);
4530
4531 /* Init UST app hash table */
4532 ust_app_ht_alloc();
4533
4534 /*
4535 * Get session list pointer. This pointer MUST NOT be free(). This list is
4536 * statically declared in session.c
4537 */
4538 session_list_ptr = session_get_list();
4539
4540 /* Set up max poll set size */
4541 lttng_poll_set_max_size();
4542
4543 /* Create thread to manage the client socket */
4544 ret = pthread_create(&client_thread, NULL,
4545 thread_manage_clients, (void *) NULL);
4546 if (ret != 0) {
4547 PERROR("pthread_create clients");
4548 goto exit_client;
4549 }
4550
4551 /* Create thread to dispatch registration */
4552 ret = pthread_create(&dispatch_thread, NULL,
4553 thread_dispatch_ust_registration, (void *) NULL);
4554 if (ret != 0) {
4555 PERROR("pthread_create dispatch");
4556 goto exit_dispatch;
4557 }
4558
4559 /* Create thread to manage application registration. */
4560 ret = pthread_create(&reg_apps_thread, NULL,
4561 thread_registration_apps, (void *) NULL);
4562 if (ret != 0) {
4563 PERROR("pthread_create registration");
4564 goto exit_reg_apps;
4565 }
4566
4567 /* Create thread to manage application socket */
4568 ret = pthread_create(&apps_thread, NULL,
4569 thread_manage_apps, (void *) NULL);
4570 if (ret != 0) {
4571 PERROR("pthread_create apps");
4572 goto exit_apps;
4573 }
4574
4575 /* Create kernel thread to manage kernel event */
4576 ret = pthread_create(&kernel_thread, NULL,
4577 thread_manage_kernel, (void *) NULL);
4578 if (ret != 0) {
4579 PERROR("pthread_create kernel");
4580 goto exit_kernel;
4581 }
4582
4583 ret = pthread_join(kernel_thread, &status);
4584 if (ret != 0) {
4585 PERROR("pthread_join");
4586 goto error; /* join error, exit without cleanup */
4587 }
4588
4589 exit_kernel:
4590 ret = pthread_join(apps_thread, &status);
4591 if (ret != 0) {
4592 PERROR("pthread_join");
4593 goto error; /* join error, exit without cleanup */
4594 }
4595
4596 exit_apps:
4597 ret = pthread_join(reg_apps_thread, &status);
4598 if (ret != 0) {
4599 PERROR("pthread_join");
4600 goto error; /* join error, exit without cleanup */
4601 }
4602
4603 exit_reg_apps:
4604 ret = pthread_join(dispatch_thread, &status);
4605 if (ret != 0) {
4606 PERROR("pthread_join");
4607 goto error; /* join error, exit without cleanup */
4608 }
4609
4610 exit_dispatch:
4611 ret = pthread_join(client_thread, &status);
4612 if (ret != 0) {
4613 PERROR("pthread_join");
4614 goto error; /* join error, exit without cleanup */
4615 }
4616
4617 ret = join_consumer_thread(&kconsumer_data);
4618 if (ret != 0) {
4619 PERROR("join_consumer");
4620 goto error; /* join error, exit without cleanup */
4621 }
4622
4623 exit_client:
4624 exit:
4625 /*
4626 * cleanup() is called when no other thread is running.
4627 */
4628 rcu_thread_online();
4629 cleanup();
4630 rcu_thread_offline();
4631 rcu_unregister_thread();
4632 if (!ret) {
4633 exit(EXIT_SUCCESS);
4634 }
4635 error:
4636 exit(EXIT_FAILURE);
4637 }
LTTng 2.0 tools and control repository
This page took 0.188883 seconds and 3 git commands to generate.