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Rename ust app function for better semantic
[lttng-tools.git] / 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 <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
44
45 #include <lttngerr.h>
46
47 #include "channel.h"
48 #include "compat/poll.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "hashtable.h"
53 #include "kernel.h"
54 #include "lttng-sessiond.h"
55 #include "shm.h"
56 #include "ust-app.h"
57 #include "ust-ctl.h"
58 #include "utils.h"
59
60 #define CONSUMERD_FILE "lttng-consumerd"
61
62 struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78 };
79
80 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
83 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86 /* Variables */
87 int opt_verbose; /* Not static for lttngerr.h */
88 int opt_verbose_consumer; /* Not static for lttngerr.h */
89 int opt_quiet; /* Not static for lttngerr.h */
90
91 const char *progname;
92 const char *opt_tracing_group;
93 static int opt_sig_parent;
94 static int opt_daemon;
95 static int is_root; /* Set to 1 if the daemon is running as root */
96 static pid_t ppid; /* Parent PID for --sig-parent option */
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_path =
175 __stringify(CONFIG_CONSUMERD32_PATH);
176 static const char *consumerd64_path =
177 __stringify(CONFIG_CONSUMERD64_PATH);
178 static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180 static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
182
183 static
184 void setup_consumerd_path(void)
185 {
186 const char *path, *libdir;
187
188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
192 */
193 #if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path[0]) {
195 consumerd32_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200 #elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path[0]) {
202 consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
203 }
204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
206 }
207 #else
208 #error "Unknown bitness"
209 #endif
210
211 /*
212 * runtime env. var. overrides the build default.
213 */
214 path = getenv("LTTNG_CONSUMERD32_PATH");
215 if (path) {
216 consumerd32_path = path;
217 }
218 path = getenv("LTTNG_CONSUMERD64_PATH");
219 if (path) {
220 consumerd64_path = path;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
229 }
230 }
231
232 /*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235 static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237 {
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258 error:
259 return ret;
260 }
261
262 /*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267 static int check_thread_quit_pipe(int fd, uint32_t events)
268 {
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274 }
275
276 /*
277 * Remove modules in reverse load order.
278 */
279 static int modprobe_remove_kernel_modules(void)
280 {
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
286 "/sbin/modprobe -r -q %s",
287 kernel_modules_list[i].name);
288 if (ret < 0) {
289 perror("snprintf modprobe -r");
290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
295 ERR("Unable to launch modprobe -r for module %s",
296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307 error:
308 return ret;
309 }
310
311 /*
312 * Return group ID of the tracing group or -1 if not found.
313 */
314 static gid_t allowed_group(void)
315 {
316 struct group *grp;
317
318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328 }
329
330 /*
331 * Init thread quit pipe.
332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335 static int init_thread_quit_pipe(void)
336 {
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345 error:
346 return ret;
347 }
348
349 /*
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
352 */
353 static void teardown_kernel_session(struct ltt_session *session)
354 {
355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
357 return;
358 }
359
360 DBG("Tearing down kernel session");
361
362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
368 }
369
370 trace_kernel_destroy_session(session->kernel_session);
371 }
372
373 /*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377 static void teardown_ust_session(struct ltt_session *session)
378 {
379 int ret;
380
381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
383 return;
384 }
385
386 DBG("Tearing down UST session(s)");
387
388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
392
393 trace_ust_destroy_session(session->ust_session);
394 }
395
396 /*
397 * Stop all threads by closing the thread quit pipe.
398 */
399 static void stop_threads(void)
400 {
401 int ret;
402
403 /* Stopping all threads */
404 DBG("Terminating all threads");
405 ret = notify_thread_pipe(thread_quit_pipe[1]);
406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
413 }
414
415 /*
416 * Cleanup the daemon
417 */
418 static void cleanup(void)
419 {
420 int ret;
421 char *cmd;
422 struct ltt_session *sess, *stmp;
423
424 DBG("Cleaning up");
425
426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
432
433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
438 }
439
440 DBG("Cleaning up all session");
441
442 /* Destroy session list mutex */
443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
449 teardown_kernel_session(sess);
450 teardown_ust_session(sess);
451 free(sess);
452 }
453 }
454
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
457
458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
459
460 DBG("Closing kernel fd");
461 close(kernel_tracer_fd);
462
463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
476 }
477
478 /*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
482 */
483 static int send_unix_sock(int sock, void *buf, size_t len)
484 {
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491 }
492
493 /*
494 * Free memory of a command context structure.
495 */
496 static void clean_command_ctx(struct command_ctx **cmd_ctx)
497 {
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509 }
510
511 /*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516 {
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
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 0 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 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634 error:
635 return ret;
636 }
637
638 /*
639 * Notify UST applications using the shm mmap futex.
640 */
641 static int notify_ust_apps(int active)
642 {
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659 error:
660 return -1;
661 }
662
663 /*
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671 {
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692 error:
693 return ret;
694 }
695
696 /*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700 static int update_kernel_poll(struct lttng_poll_event *events)
701 {
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732 error:
733 session_unlock_list();
734 return -1;
735 }
736
737 /*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
744 {
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793 error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797 }
798
799 /*
800 * For each tracing session, update newly registered apps.
801 */
802 static void update_ust_app(int app_sock)
803 {
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812 }
813
814 /*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820 static void *thread_manage_kernel(void *data)
821 {
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
839 while (1) {
840 if (update_poll_flag == 1) {
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
903 }
904 }
905 }
906 }
907
908 error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916 }
917
918 /*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921 static void *thread_manage_consumer(void *data)
922 {
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059 error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072 }
1073
1074 /*
1075 * This thread manage application communication.
1076 */
1077 static void *thread_manage_apps(void *data)
1078 {
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
1158 ust_app_unregister(ust_cmd.sock);
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195 error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1204 return NULL;
1205 }
1206
1207 /*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211 static void *thread_dispatch_ust_registration(void *data)
1212 {
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266 error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269 }
1270
1271 /*
1272 * This thread manage application registration.
1273 */
1274 static void *thread_registration_apps(void *data)
1275 {
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
1371
1372 ust_cmd->sock = sock;
1373
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
1394 }
1395 }
1396
1397 error:
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410 }
1411
1412 /*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417 {
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478 error:
1479 return ret;
1480 }
1481
1482 /*
1483 * Join consumer thread
1484 */
1485 static int join_consumer_thread(struct consumer_data *consumer_data)
1486 {
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500 }
1501
1502 /*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508 {
1509 int ret;
1510 pid_t pid;
1511 const char *verbosity;
1512
1513 DBG("Spawning consumerd");
1514
1515 pid = fork();
1516 if (pid == 0) {
1517 /*
1518 * Exec consumerd.
1519 */
1520 if (opt_verbose > 1 || opt_verbose_consumer) {
1521 verbosity = "--verbose";
1522 } else {
1523 verbosity = "--quiet";
1524 }
1525 switch (consumer_data->type) {
1526 case LTTNG_CONSUMER_KERNEL:
1527 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1528 "lttng-consumerd", verbosity, "-k",
1529 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1530 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1531 NULL);
1532 break;
1533 case LTTNG_CONSUMER64_UST:
1534 {
1535 char *tmpnew;
1536
1537 if (consumerd64_libdir[0] != '\0') {
1538 char *tmp;
1539 size_t tmplen;
1540
1541 tmp = getenv("LD_LIBRARY_PATH");
1542 if (!tmp) {
1543 tmp = "";
1544 }
1545 tmplen = strlen("LD_LIBRARY_PATH=")
1546 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1547 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1548 if (!tmpnew) {
1549 ret = -ENOMEM;
1550 goto error;
1551 }
1552 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1553 strcat(tmpnew, consumerd64_libdir);
1554 if (tmp[0] != '\0') {
1555 strcat(tmpnew, ":");
1556 strcat(tmpnew, tmp);
1557 }
1558 ret = putenv(tmpnew);
1559 if (ret) {
1560 ret = -errno;
1561 goto error;
1562 }
1563 }
1564 ret = execl(consumerd64_path, verbosity, "-u",
1565 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1566 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1567 NULL);
1568 if (consumerd64_libdir[0] != '\0') {
1569 free(tmpnew);
1570 }
1571 if (ret) {
1572 goto error;
1573 }
1574 break;
1575 }
1576 case LTTNG_CONSUMER32_UST:
1577 {
1578 char *tmpnew = NULL;
1579
1580 if (consumerd32_libdir[0] != '\0') {
1581 char *tmp;
1582 size_t tmplen;
1583
1584 tmp = getenv("LD_LIBRARY_PATH");
1585 if (!tmp) {
1586 tmp = "";
1587 }
1588 tmplen = strlen("LD_LIBRARY_PATH=")
1589 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1590 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1591 if (!tmpnew) {
1592 ret = -ENOMEM;
1593 goto error;
1594 }
1595 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1596 strcat(tmpnew, consumerd32_libdir);
1597 if (tmp[0] != '\0') {
1598 strcat(tmpnew, ":");
1599 strcat(tmpnew, tmp);
1600 }
1601 ret = putenv(tmpnew);
1602 if (ret) {
1603 ret = -errno;
1604 goto error;
1605 }
1606 }
1607 ret = execl(consumerd32_path, verbosity, "-u",
1608 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1609 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1610 NULL);
1611 if (consumerd32_libdir[0] != '\0') {
1612 free(tmpnew);
1613 }
1614 if (ret) {
1615 goto error;
1616 }
1617 break;
1618 }
1619 default:
1620 perror("unknown consumer type");
1621 exit(EXIT_FAILURE);
1622 }
1623 if (errno != 0) {
1624 perror("kernel start consumer exec");
1625 }
1626 exit(EXIT_FAILURE);
1627 } else if (pid > 0) {
1628 ret = pid;
1629 } else {
1630 perror("start consumer fork");
1631 ret = -errno;
1632 }
1633 error:
1634 return ret;
1635 }
1636
1637 /*
1638 * Spawn the consumerd daemon and session daemon thread.
1639 */
1640 static int start_consumerd(struct consumer_data *consumer_data)
1641 {
1642 int ret;
1643
1644 pthread_mutex_lock(&consumer_data->pid_mutex);
1645 if (consumer_data->pid != 0) {
1646 pthread_mutex_unlock(&consumer_data->pid_mutex);
1647 goto end;
1648 }
1649
1650 ret = spawn_consumerd(consumer_data);
1651 if (ret < 0) {
1652 ERR("Spawning consumerd failed");
1653 pthread_mutex_unlock(&consumer_data->pid_mutex);
1654 goto error;
1655 }
1656
1657 /* Setting up the consumer_data pid */
1658 consumer_data->pid = ret;
1659 DBG2("Consumer pid %d", consumer_data->pid);
1660 pthread_mutex_unlock(&consumer_data->pid_mutex);
1661
1662 DBG2("Spawning consumer control thread");
1663 ret = spawn_consumer_thread(consumer_data);
1664 if (ret < 0) {
1665 ERR("Fatal error spawning consumer control thread");
1666 goto error;
1667 }
1668
1669 end:
1670 return 0;
1671
1672 error:
1673 return ret;
1674 }
1675
1676 /*
1677 * modprobe_kernel_modules
1678 */
1679 static int modprobe_kernel_modules(void)
1680 {
1681 int ret = 0, i;
1682 char modprobe[256];
1683
1684 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1685 ret = snprintf(modprobe, sizeof(modprobe),
1686 "/sbin/modprobe %s%s",
1687 kernel_modules_list[i].required ? "" : "-q ",
1688 kernel_modules_list[i].name);
1689 if (ret < 0) {
1690 perror("snprintf modprobe");
1691 goto error;
1692 }
1693 modprobe[sizeof(modprobe) - 1] = '\0';
1694 ret = system(modprobe);
1695 if (ret == -1) {
1696 ERR("Unable to launch modprobe for module %s",
1697 kernel_modules_list[i].name);
1698 } else if (kernel_modules_list[i].required
1699 && WEXITSTATUS(ret) != 0) {
1700 ERR("Unable to load module %s",
1701 kernel_modules_list[i].name);
1702 } else {
1703 DBG("Modprobe successfully %s",
1704 kernel_modules_list[i].name);
1705 }
1706 }
1707
1708 error:
1709 return ret;
1710 }
1711
1712 /*
1713 * mount_debugfs
1714 */
1715 static int mount_debugfs(char *path)
1716 {
1717 int ret;
1718 char *type = "debugfs";
1719
1720 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1721 if (ret < 0) {
1722 PERROR("Cannot create debugfs path");
1723 goto error;
1724 }
1725
1726 ret = mount(type, path, type, 0, NULL);
1727 if (ret < 0) {
1728 PERROR("Cannot mount debugfs");
1729 goto error;
1730 }
1731
1732 DBG("Mounted debugfs successfully at %s", path);
1733
1734 error:
1735 return ret;
1736 }
1737
1738 /*
1739 * Setup necessary data for kernel tracer action.
1740 */
1741 static void init_kernel_tracer(void)
1742 {
1743 int ret;
1744 char *proc_mounts = "/proc/mounts";
1745 char line[256];
1746 char *debugfs_path = NULL, *lttng_path = NULL;
1747 FILE *fp;
1748
1749 /* Detect debugfs */
1750 fp = fopen(proc_mounts, "r");
1751 if (fp == NULL) {
1752 ERR("Unable to probe %s", proc_mounts);
1753 goto error;
1754 }
1755
1756 while (fgets(line, sizeof(line), fp) != NULL) {
1757 if (strstr(line, "debugfs") != NULL) {
1758 /* Remove first string */
1759 strtok(line, " ");
1760 /* Dup string here so we can reuse line later on */
1761 debugfs_path = strdup(strtok(NULL, " "));
1762 DBG("Got debugfs path : %s", debugfs_path);
1763 break;
1764 }
1765 }
1766
1767 fclose(fp);
1768
1769 /* Mount debugfs if needded */
1770 if (debugfs_path == NULL) {
1771 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1772 if (ret < 0) {
1773 perror("asprintf debugfs path");
1774 goto error;
1775 }
1776 ret = mount_debugfs(debugfs_path);
1777 if (ret < 0) {
1778 perror("Cannot mount debugfs");
1779 goto error;
1780 }
1781 }
1782
1783 /* Modprobe lttng kernel modules */
1784 ret = modprobe_kernel_modules();
1785 if (ret < 0) {
1786 goto error;
1787 }
1788
1789 /* Setup lttng kernel path */
1790 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1791 if (ret < 0) {
1792 perror("asprintf lttng path");
1793 goto error;
1794 }
1795
1796 /* Open debugfs lttng */
1797 kernel_tracer_fd = open(lttng_path, O_RDWR);
1798 if (kernel_tracer_fd < 0) {
1799 DBG("Failed to open %s", lttng_path);
1800 goto error;
1801 }
1802
1803 free(lttng_path);
1804 free(debugfs_path);
1805 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1806 return;
1807
1808 error:
1809 if (lttng_path) {
1810 free(lttng_path);
1811 }
1812 if (debugfs_path) {
1813 free(debugfs_path);
1814 }
1815 WARN("No kernel tracer available");
1816 kernel_tracer_fd = 0;
1817 return;
1818 }
1819
1820 /*
1821 * Init tracing by creating trace directory and sending fds kernel consumer.
1822 */
1823 static int init_kernel_tracing(struct ltt_kernel_session *session)
1824 {
1825 int ret = 0;
1826
1827 if (session->consumer_fds_sent == 0) {
1828 /*
1829 * Assign default kernel consumer socket if no consumer assigned to the
1830 * kernel session. At this point, it's NOT suppose to be 0 but this is
1831 * an extra security check.
1832 */
1833 if (session->consumer_fd == 0) {
1834 session->consumer_fd = kconsumer_data.cmd_sock;
1835 }
1836
1837 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1838 if (ret < 0) {
1839 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1840 goto error;
1841 }
1842
1843 session->consumer_fds_sent = 1;
1844 }
1845
1846 error:
1847 return ret;
1848 }
1849
1850 /*
1851 * Create an UST session and add it to the session ust list.
1852 */
1853 static int create_ust_session(struct ltt_session *session,
1854 struct lttng_domain *domain)
1855 {
1856 int ret;
1857 unsigned int uid;
1858 struct ltt_ust_session *lus = NULL;
1859
1860 switch (domain->type) {
1861 case LTTNG_DOMAIN_UST:
1862 break;
1863 default:
1864 ret = LTTCOMM_UNKNOWN_DOMAIN;
1865 goto error;
1866 }
1867
1868 DBG("Creating UST session");
1869
1870 uid = session->uid;
1871 lus = trace_ust_create_session(session->path, uid, domain);
1872 if (lus == NULL) {
1873 ret = LTTCOMM_UST_SESS_FAIL;
1874 goto error;
1875 }
1876
1877 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1878 geteuid(), allowed_group());
1879 if (ret < 0) {
1880 if (ret != -EEXIST) {
1881 ERR("Trace directory creation error");
1882 ret = LTTCOMM_UST_SESS_FAIL;
1883 goto error;
1884 }
1885 }
1886
1887 /* The domain type dictate different actions on session creation */
1888 switch (domain->type) {
1889 case LTTNG_DOMAIN_UST:
1890 /* No ustctl for the global UST domain */
1891 break;
1892 default:
1893 ERR("Unknown UST domain on create session %d", domain->type);
1894 goto error;
1895 }
1896 session->ust_session = lus;
1897
1898 return LTTCOMM_OK;
1899
1900 error:
1901 free(lus);
1902 return ret;
1903 }
1904
1905 /*
1906 * Create a kernel tracer session then create the default channel.
1907 */
1908 static int create_kernel_session(struct ltt_session *session)
1909 {
1910 int ret;
1911
1912 DBG("Creating kernel session");
1913
1914 ret = kernel_create_session(session, kernel_tracer_fd);
1915 if (ret < 0) {
1916 ret = LTTCOMM_KERN_SESS_FAIL;
1917 goto error;
1918 }
1919
1920 /* Set kernel consumer socket fd */
1921 if (kconsumer_data.cmd_sock) {
1922 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1923 }
1924
1925 ret = mkdir_recursive(session->kernel_session->trace_path,
1926 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
1927 if (ret < 0) {
1928 if (ret != -EEXIST) {
1929 ERR("Trace directory creation error");
1930 goto error;
1931 }
1932 }
1933
1934 error:
1935 return ret;
1936 }
1937
1938 /*
1939 * Using the session list, filled a lttng_session array to send back to the
1940 * client for session listing.
1941 *
1942 * The session list lock MUST be acquired before calling this function. Use
1943 * session_lock_list() and session_unlock_list().
1944 */
1945 static void list_lttng_sessions(struct lttng_session *sessions)
1946 {
1947 int i = 0;
1948 struct ltt_session *session;
1949
1950 DBG("Getting all available session");
1951 /*
1952 * Iterate over session list and append data after the control struct in
1953 * the buffer.
1954 */
1955 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1956 strncpy(sessions[i].path, session->path, PATH_MAX);
1957 sessions[i].path[PATH_MAX - 1] = '\0';
1958 strncpy(sessions[i].name, session->name, NAME_MAX);
1959 sessions[i].name[NAME_MAX - 1] = '\0';
1960 sessions[i].enabled = session->enabled;
1961 i++;
1962 }
1963 }
1964
1965 /*
1966 * Fill lttng_channel array of all channels.
1967 */
1968 static void list_lttng_channels(int domain, struct ltt_session *session,
1969 struct lttng_channel *channels)
1970 {
1971 int i = 0;
1972 struct ltt_kernel_channel *kchan;
1973
1974 DBG("Listing channels for session %s", session->name);
1975
1976 switch (domain) {
1977 case LTTNG_DOMAIN_KERNEL:
1978 /* Kernel channels */
1979 if (session->kernel_session != NULL) {
1980 cds_list_for_each_entry(kchan,
1981 &session->kernel_session->channel_list.head, list) {
1982 /* Copy lttng_channel struct to array */
1983 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1984 channels[i].enabled = kchan->enabled;
1985 i++;
1986 }
1987 }
1988 break;
1989 case LTTNG_DOMAIN_UST:
1990 {
1991 struct cds_lfht_iter iter;
1992 struct ltt_ust_channel *uchan;
1993
1994 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1995 &iter, uchan, node) {
1996 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1997 channels[i].attr.overwrite = uchan->attr.overwrite;
1998 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1999 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2000 channels[i].attr.switch_timer_interval =
2001 uchan->attr.switch_timer_interval;
2002 channels[i].attr.read_timer_interval =
2003 uchan->attr.read_timer_interval;
2004 channels[i].enabled = uchan->enabled;
2005 switch (uchan->attr.output) {
2006 case LTTNG_UST_MMAP:
2007 default:
2008 channels[i].attr.output = LTTNG_EVENT_MMAP;
2009 break;
2010 }
2011 i++;
2012 }
2013 break;
2014 }
2015 default:
2016 break;
2017 }
2018 }
2019
2020 /*
2021 * Create a list of ust global domain events.
2022 */
2023 static int list_lttng_ust_global_events(char *channel_name,
2024 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2025 {
2026 int i = 0, ret = 0;
2027 unsigned int nb_event = 0;
2028 struct cds_lfht_iter iter;
2029 struct cds_lfht_node *node;
2030 struct ltt_ust_channel *uchan;
2031 struct ltt_ust_event *uevent;
2032 struct lttng_event *tmp;
2033
2034 DBG("Listing UST global events for channel %s", channel_name);
2035
2036 rcu_read_lock();
2037
2038 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2039 strlen(channel_name), &iter);
2040 if (node == NULL) {
2041 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2042 goto error;
2043 }
2044
2045 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2046
2047 nb_event += hashtable_get_count(uchan->events);
2048
2049 if (nb_event == 0) {
2050 ret = nb_event;
2051 goto error;
2052 }
2053
2054 DBG3("Listing UST global %d events", nb_event);
2055
2056 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2057 if (tmp == NULL) {
2058 ret = -LTTCOMM_FATAL;
2059 goto error;
2060 }
2061
2062 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2063 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2064 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2065 tmp[i].enabled = uevent->enabled;
2066 switch (uevent->attr.instrumentation) {
2067 case LTTNG_UST_TRACEPOINT:
2068 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2069 break;
2070 case LTTNG_UST_PROBE:
2071 tmp[i].type = LTTNG_EVENT_PROBE;
2072 break;
2073 case LTTNG_UST_FUNCTION:
2074 tmp[i].type = LTTNG_EVENT_FUNCTION;
2075 break;
2076 }
2077 i++;
2078 }
2079
2080 ret = nb_event;
2081 *events = tmp;
2082
2083 error:
2084 rcu_read_unlock();
2085 return ret;
2086 }
2087
2088 /*
2089 * Fill lttng_event array of all kernel events in the channel.
2090 */
2091 static int list_lttng_kernel_events(char *channel_name,
2092 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2093 {
2094 int i = 0, ret;
2095 unsigned int nb_event;
2096 struct ltt_kernel_event *event;
2097 struct ltt_kernel_channel *kchan;
2098
2099 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2100 if (kchan == NULL) {
2101 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2102 goto error;
2103 }
2104
2105 nb_event = kchan->event_count;
2106
2107 DBG("Listing events for channel %s", kchan->channel->name);
2108
2109 if (nb_event == 0) {
2110 ret = nb_event;
2111 goto error;
2112 }
2113
2114 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2115 if (*events == NULL) {
2116 ret = LTTCOMM_FATAL;
2117 goto error;
2118 }
2119
2120 /* Kernel channels */
2121 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2122 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2123 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2124 (*events)[i].enabled = event->enabled;
2125 switch (event->event->instrumentation) {
2126 case LTTNG_KERNEL_TRACEPOINT:
2127 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2128 break;
2129 case LTTNG_KERNEL_KPROBE:
2130 case LTTNG_KERNEL_KRETPROBE:
2131 (*events)[i].type = LTTNG_EVENT_PROBE;
2132 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2133 sizeof(struct lttng_kernel_kprobe));
2134 break;
2135 case LTTNG_KERNEL_FUNCTION:
2136 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2137 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2138 sizeof(struct lttng_kernel_function));
2139 break;
2140 case LTTNG_KERNEL_NOOP:
2141 (*events)[i].type = LTTNG_EVENT_NOOP;
2142 break;
2143 case LTTNG_KERNEL_SYSCALL:
2144 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2145 break;
2146 case LTTNG_KERNEL_ALL:
2147 assert(0);
2148 break;
2149 }
2150 i++;
2151 }
2152
2153 return nb_event;
2154
2155 error:
2156 return ret;
2157 }
2158
2159 /*
2160 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2161 */
2162 static int cmd_disable_channel(struct ltt_session *session,
2163 int domain, char *channel_name)
2164 {
2165 int ret;
2166 struct ltt_ust_session *usess;
2167
2168 usess = session->ust_session;
2169
2170 switch (domain) {
2171 case LTTNG_DOMAIN_KERNEL:
2172 {
2173 ret = channel_kernel_disable(session->kernel_session,
2174 channel_name);
2175 if (ret != LTTCOMM_OK) {
2176 goto error;
2177 }
2178
2179 kernel_wait_quiescent(kernel_tracer_fd);
2180 break;
2181 }
2182 case LTTNG_DOMAIN_UST:
2183 {
2184 struct ltt_ust_channel *uchan;
2185
2186 /* Get channel in global UST domain HT */
2187 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2188 channel_name);
2189 if (uchan == NULL) {
2190 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2191 goto error;
2192 }
2193
2194 ret = ust_app_disable_channel_glb(usess, uchan);
2195 if (ret < 0) {
2196 ret = LTTCOMM_UST_DISABLE_FAIL;
2197 goto error;
2198 }
2199
2200 uchan->enabled = 0;
2201
2202 break;
2203 }
2204 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2205 case LTTNG_DOMAIN_UST_EXEC_NAME:
2206 case LTTNG_DOMAIN_UST_PID:
2207 ret = LTTCOMM_NOT_IMPLEMENTED;
2208 goto error;
2209 default:
2210 ret = LTTCOMM_UNKNOWN_DOMAIN;
2211 goto error;
2212 }
2213
2214 ret = LTTCOMM_OK;
2215
2216 error:
2217 return ret;
2218 }
2219
2220 /*
2221 * Copy channel from attributes and set it in the application channel list.
2222 */
2223 /*
2224 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2225 struct lttng_channel *attr, struct ust_app *app)
2226 {
2227 int ret;
2228 struct ltt_ust_channel *uchan, *new_chan;
2229
2230 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2231 if (uchan == NULL) {
2232 ret = LTTCOMM_FATAL;
2233 goto error;
2234 }
2235
2236 new_chan = trace_ust_create_channel(attr, usess->path);
2237 if (new_chan == NULL) {
2238 PERROR("malloc ltt_ust_channel");
2239 ret = LTTCOMM_FATAL;
2240 goto error;
2241 }
2242
2243 ret = channel_ust_copy(new_chan, uchan);
2244 if (ret < 0) {
2245 ret = LTTCOMM_FATAL;
2246 goto error;
2247 }
2248
2249 error:
2250 return ret;
2251 }
2252 */
2253
2254 /*
2255 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2256 */
2257 static int cmd_enable_channel(struct ltt_session *session,
2258 int domain, struct lttng_channel *attr)
2259 {
2260 int ret;
2261 struct ltt_ust_session *usess = session->ust_session;
2262
2263 DBG("Enabling channel %s for session %s", attr->name, session->name);
2264
2265 switch (domain) {
2266 case LTTNG_DOMAIN_KERNEL:
2267 {
2268 struct ltt_kernel_channel *kchan;
2269
2270 kchan = trace_kernel_get_channel_by_name(attr->name,
2271 session->kernel_session);
2272 if (kchan == NULL) {
2273 ret = channel_kernel_create(session->kernel_session,
2274 attr, kernel_poll_pipe[1]);
2275 } else {
2276 ret = channel_kernel_enable(session->kernel_session, kchan);
2277 }
2278
2279 if (ret != LTTCOMM_OK) {
2280 goto error;
2281 }
2282
2283 kernel_wait_quiescent(kernel_tracer_fd);
2284 break;
2285 }
2286 case LTTNG_DOMAIN_UST:
2287 {
2288 struct ltt_ust_channel *uchan;
2289
2290 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2291
2292 /* Get channel in global UST domain HT */
2293 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2294 attr->name);
2295 if (uchan == NULL) {
2296 uchan = trace_ust_create_channel(attr, usess->pathname);
2297 if (uchan == NULL) {
2298 ret = LTTCOMM_UST_CHAN_FAIL;
2299 goto error;
2300 }
2301
2302 rcu_read_lock();
2303 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2304 rcu_read_unlock();
2305 DBG2("UST channel %s added to global domain HT", attr->name);
2306
2307 /* Add channel to all registered applications */
2308 ret = ust_app_create_channel_glb(usess, uchan);
2309 if (ret != 0) {
2310 ret = LTTCOMM_UST_CHAN_FAIL;
2311 goto error;
2312 }
2313 } else {
2314 /* If already enabled, everything is OK */
2315 if (uchan->enabled) {
2316 ret = LTTCOMM_OK;
2317 goto error;
2318 }
2319
2320 ret = ust_app_enable_channel_glb(usess, uchan);
2321 if (ret < 0) {
2322 ret = LTTCOMM_UST_ENABLE_FAIL;
2323 goto error;
2324 }
2325 }
2326
2327 uchan->enabled = 1;
2328
2329 break;
2330 }
2331 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2332 case LTTNG_DOMAIN_UST_EXEC_NAME:
2333 case LTTNG_DOMAIN_UST_PID:
2334 ret = LTTCOMM_NOT_IMPLEMENTED;
2335 goto error;
2336 default:
2337 ret = LTTCOMM_UNKNOWN_DOMAIN;
2338 goto error;
2339 }
2340
2341 ret = LTTCOMM_OK;
2342
2343 error:
2344 return ret;
2345 }
2346
2347 /*
2348 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2349 */
2350 static int cmd_disable_event(struct ltt_session *session, int domain,
2351 char *channel_name, char *event_name)
2352 {
2353 int ret;
2354
2355 switch (domain) {
2356 case LTTNG_DOMAIN_KERNEL:
2357 {
2358 struct ltt_kernel_channel *kchan;
2359 struct ltt_kernel_session *ksess;
2360
2361 ksess = session->kernel_session;
2362
2363 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2364 if (kchan == NULL) {
2365 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2366 goto error;
2367 }
2368
2369 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2370 if (ret != LTTCOMM_OK) {
2371 goto error;
2372 }
2373
2374 kernel_wait_quiescent(kernel_tracer_fd);
2375 break;
2376 }
2377 case LTTNG_DOMAIN_UST:
2378 {
2379 struct ltt_ust_session *usess;
2380 struct ltt_ust_channel *uchan;
2381 struct ltt_ust_event *uevent;
2382
2383 usess = session->ust_session;
2384
2385 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2386 channel_name);
2387 if (uchan == NULL) {
2388 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2389 goto error;
2390 }
2391
2392 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2393 if (uevent == NULL) {
2394 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2395 goto error;
2396 }
2397
2398 ret = ust_app_disable_event_glb(usess, uchan, uevent);
2399 if (ret < 0) {
2400 ret = LTTCOMM_UST_DISABLE_FAIL;
2401 goto error;
2402 }
2403
2404 uevent->enabled = 0;
2405
2406 DBG2("Disable UST event %s in channel %s completed", event_name,
2407 channel_name);
2408
2409 break;
2410 }
2411 case LTTNG_DOMAIN_UST_EXEC_NAME:
2412 case LTTNG_DOMAIN_UST_PID:
2413 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2414 default:
2415 ret = LTTCOMM_NOT_IMPLEMENTED;
2416 goto error;
2417 }
2418
2419 ret = LTTCOMM_OK;
2420
2421 error:
2422 return ret;
2423 }
2424
2425 /*
2426 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2427 */
2428 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2429 char *channel_name)
2430 {
2431 int ret;
2432
2433 switch (domain) {
2434 case LTTNG_DOMAIN_KERNEL:
2435 {
2436 struct ltt_kernel_session *ksess;
2437 struct ltt_kernel_channel *kchan;
2438
2439 ksess = session->kernel_session;
2440
2441 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2442 if (kchan == NULL) {
2443 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2444 goto error;
2445 }
2446
2447 ret = event_kernel_disable_all(ksess, kchan);
2448 if (ret != LTTCOMM_OK) {
2449 goto error;
2450 }
2451
2452 kernel_wait_quiescent(kernel_tracer_fd);
2453 break;
2454 }
2455 case LTTNG_DOMAIN_UST:
2456 {
2457 struct ltt_ust_session *usess;
2458 struct ltt_ust_channel *uchan;
2459
2460 usess = session->ust_session;
2461
2462 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2463 channel_name);
2464 if (uchan == NULL) {
2465 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2466 goto error;
2467 }
2468
2469 ret = ust_app_disable_all_event_glb(usess, uchan);
2470 if (ret < 0) {
2471 ret = LTTCOMM_UST_DISABLE_FAIL;
2472 goto error;
2473 }
2474
2475 DBG2("Disable all UST event in channel %s completed", channel_name);
2476
2477 break;
2478 }
2479 case LTTNG_DOMAIN_UST_EXEC_NAME:
2480 case LTTNG_DOMAIN_UST_PID:
2481 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2482 default:
2483 ret = LTTCOMM_NOT_IMPLEMENTED;
2484 goto error;
2485 }
2486
2487 ret = LTTCOMM_OK;
2488
2489 error:
2490 return ret;
2491 }
2492
2493 /*
2494 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2495 */
2496 static int cmd_add_context(struct ltt_session *session, int domain,
2497 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2498 {
2499 int ret;
2500
2501 switch (domain) {
2502 case LTTNG_DOMAIN_KERNEL:
2503 /* Add kernel context to kernel tracer */
2504 ret = context_kernel_add(session->kernel_session, ctx,
2505 event_name, channel_name);
2506 if (ret != LTTCOMM_OK) {
2507 goto error;
2508 }
2509 break;
2510 case LTTNG_DOMAIN_UST:
2511 {
2512 /*
2513 struct ltt_ust_session *usess;
2514
2515 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2516 ret = context_ust_add(usess, ctx,
2517 event_name, channel_name, domain);
2518 if (ret != LTTCOMM_OK) {
2519 goto error;
2520 }
2521 }
2522 break;
2523 */
2524 }
2525 default:
2526 /* TODO: UST other domains */
2527 ret = LTTCOMM_NOT_IMPLEMENTED;
2528 goto error;
2529 }
2530
2531 ret = LTTCOMM_OK;
2532
2533 error:
2534 return ret;
2535 }
2536
2537 /*
2538 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2539 */
2540 static int cmd_enable_event(struct ltt_session *session, int domain,
2541 char *channel_name, struct lttng_event *event)
2542 {
2543 int ret;
2544 struct lttng_channel *attr;
2545 struct ltt_ust_session *usess = session->ust_session;
2546
2547 switch (domain) {
2548 case LTTNG_DOMAIN_KERNEL:
2549 {
2550 struct ltt_kernel_channel *kchan;
2551
2552 kchan = trace_kernel_get_channel_by_name(channel_name,
2553 session->kernel_session);
2554 if (kchan == NULL) {
2555 attr = channel_new_default_attr(domain);
2556 if (attr == NULL) {
2557 ret = LTTCOMM_FATAL;
2558 goto error;
2559 }
2560 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2561
2562 /* This call will notify the kernel thread */
2563 ret = channel_kernel_create(session->kernel_session,
2564 attr, kernel_poll_pipe[1]);
2565 if (ret != LTTCOMM_OK) {
2566 free(attr);
2567 goto error;
2568 }
2569 free(attr);
2570 }
2571
2572 /* Get the newly created kernel channel pointer */
2573 kchan = trace_kernel_get_channel_by_name(channel_name,
2574 session->kernel_session);
2575 if (kchan == NULL) {
2576 /* This sould not happen... */
2577 ret = LTTCOMM_FATAL;
2578 goto error;
2579 }
2580
2581 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2582 event);
2583 if (ret != LTTCOMM_OK) {
2584 goto error;
2585 }
2586
2587 kernel_wait_quiescent(kernel_tracer_fd);
2588 break;
2589 }
2590 case LTTNG_DOMAIN_UST:
2591 {
2592 struct lttng_channel *attr;
2593 struct ltt_ust_channel *uchan;
2594
2595 /* Get channel from global UST domain */
2596 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2597 channel_name);
2598 if (uchan == NULL) {
2599 /* Create default channel */
2600 attr = channel_new_default_attr(domain);
2601 if (attr == NULL) {
2602 ret = LTTCOMM_FATAL;
2603 goto error;
2604 }
2605 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2606 attr->name[NAME_MAX - 1] = '\0';
2607
2608 /* Use the internal command enable channel */
2609 ret = cmd_enable_channel(session, domain, attr);
2610 if (ret != LTTCOMM_OK) {
2611 free(attr);
2612 goto error;
2613 }
2614 free(attr);
2615
2616 /* Get the newly created channel reference back */
2617 uchan = trace_ust_find_channel_by_name(
2618 usess->domain_global.channels, channel_name);
2619 if (uchan == NULL) {
2620 /* Something is really wrong */
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
2624 }
2625
2626 /* At this point, the session and channel exist on the tracer */
2627
2628 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2629 if (ret != LTTCOMM_OK) {
2630 goto error;
2631 }
2632 break;
2633 }
2634 case LTTNG_DOMAIN_UST_EXEC_NAME:
2635 case LTTNG_DOMAIN_UST_PID:
2636 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2637 default:
2638 ret = LTTCOMM_NOT_IMPLEMENTED;
2639 goto error;
2640 }
2641
2642 ret = LTTCOMM_OK;
2643
2644 error:
2645 return ret;
2646 }
2647
2648 /*
2649 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2650 */
2651 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2652 char *channel_name, int event_type)
2653 {
2654 int ret;
2655 struct ltt_kernel_channel *kchan;
2656
2657 switch (domain) {
2658 case LTTNG_DOMAIN_KERNEL:
2659 kchan = trace_kernel_get_channel_by_name(channel_name,
2660 session->kernel_session);
2661 if (kchan == NULL) {
2662 /* This call will notify the kernel thread */
2663 ret = channel_kernel_create(session->kernel_session, NULL,
2664 kernel_poll_pipe[1]);
2665 if (ret != LTTCOMM_OK) {
2666 goto error;
2667 }
2668 }
2669
2670 /* Get the newly created kernel channel pointer */
2671 kchan = trace_kernel_get_channel_by_name(channel_name,
2672 session->kernel_session);
2673 if (kchan == NULL) {
2674 /* This sould not happen... */
2675 ret = LTTCOMM_FATAL;
2676 goto error;
2677 }
2678
2679 switch (event_type) {
2680 case LTTNG_KERNEL_SYSCALL:
2681 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2682 kchan, kernel_tracer_fd);
2683 break;
2684 case LTTNG_KERNEL_TRACEPOINT:
2685 /*
2686 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2687 * events already registered to the channel.
2688 */
2689 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2690 kchan, kernel_tracer_fd);
2691 break;
2692 case LTTNG_KERNEL_ALL:
2693 /* Enable syscalls and tracepoints */
2694 ret = event_kernel_enable_all(session->kernel_session,
2695 kchan, kernel_tracer_fd);
2696 break;
2697 default:
2698 ret = LTTCOMM_KERN_ENABLE_FAIL;
2699 goto error;
2700 }
2701 if (ret != LTTCOMM_OK) {
2702 goto error;
2703 }
2704
2705 kernel_wait_quiescent(kernel_tracer_fd);
2706 break;
2707 default:
2708 /* TODO: Userspace tracing */
2709 ret = LTTCOMM_NOT_IMPLEMENTED;
2710 goto error;
2711 }
2712
2713 ret = LTTCOMM_OK;
2714
2715 error:
2716 return ret;
2717 }
2718
2719 /*
2720 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2721 */
2722 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2723 {
2724 int ret;
2725 ssize_t nb_events = 0;
2726
2727 switch (domain) {
2728 case LTTNG_DOMAIN_KERNEL:
2729 nb_events = kernel_list_events(kernel_tracer_fd, events);
2730 if (nb_events < 0) {
2731 ret = LTTCOMM_KERN_LIST_FAIL;
2732 goto error;
2733 }
2734 break;
2735 case LTTNG_DOMAIN_UST:
2736 nb_events = ust_app_list_events(events);
2737 if (nb_events < 0) {
2738 ret = LTTCOMM_UST_LIST_FAIL;
2739 goto error;
2740 }
2741 break;
2742 default:
2743 ret = LTTCOMM_NOT_IMPLEMENTED;
2744 goto error;
2745 }
2746
2747 return nb_events;
2748
2749 error:
2750 /* Return negative value to differentiate return code */
2751 return -ret;
2752 }
2753
2754 /*
2755 * Command LTTNG_START_TRACE processed by the client thread.
2756 */
2757 static int cmd_start_trace(struct ltt_session *session)
2758 {
2759 int ret;
2760 struct ltt_kernel_session *ksession;
2761 struct ltt_ust_session *usess;
2762
2763 /* Short cut */
2764 ksession = session->kernel_session;
2765 usess = session->ust_session;
2766
2767 if (session->enabled)
2768 return LTTCOMM_UST_START_FAIL;
2769 session->enabled = 1;
2770
2771 /* Kernel tracing */
2772 if (ksession != NULL) {
2773 struct ltt_kernel_channel *kchan;
2774
2775 /* Open kernel metadata */
2776 if (ksession->metadata == NULL) {
2777 ret = kernel_open_metadata(ksession, ksession->trace_path);
2778 if (ret < 0) {
2779 ret = LTTCOMM_KERN_META_FAIL;
2780 goto error;
2781 }
2782 }
2783
2784 /* Open kernel metadata stream */
2785 if (ksession->metadata_stream_fd == 0) {
2786 ret = kernel_open_metadata_stream(ksession);
2787 if (ret < 0) {
2788 ERR("Kernel create metadata stream failed");
2789 ret = LTTCOMM_KERN_STREAM_FAIL;
2790 goto error;
2791 }
2792 }
2793
2794 /* For each channel */
2795 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2796 if (kchan->stream_count == 0) {
2797 ret = kernel_open_channel_stream(kchan);
2798 if (ret < 0) {
2799 ret = LTTCOMM_KERN_STREAM_FAIL;
2800 goto error;
2801 }
2802 /* Update the stream global counter */
2803 ksession->stream_count_global += ret;
2804 }
2805 }
2806
2807 /* Setup kernel consumer socket and send fds to it */
2808 ret = init_kernel_tracing(ksession);
2809 if (ret < 0) {
2810 ret = LTTCOMM_KERN_START_FAIL;
2811 goto error;
2812 }
2813
2814 /* This start the kernel tracing */
2815 ret = kernel_start_session(ksession);
2816 if (ret < 0) {
2817 ret = LTTCOMM_KERN_START_FAIL;
2818 goto error;
2819 }
2820
2821 /* Quiescent wait after starting trace */
2822 kernel_wait_quiescent(kernel_tracer_fd);
2823 }
2824
2825 /* Flag session that trace should start automatically */
2826 if (usess) {
2827 usess->start_trace = 1;
2828
2829 ret = ust_app_start_trace_all(usess);
2830 if (ret < 0) {
2831 ret = LTTCOMM_UST_START_FAIL;
2832 goto error;
2833 }
2834 }
2835
2836 ret = LTTCOMM_OK;
2837
2838 error:
2839 return ret;
2840 }
2841
2842 /*
2843 * Command LTTNG_STOP_TRACE processed by the client thread.
2844 */
2845 static int cmd_stop_trace(struct ltt_session *session)
2846 {
2847 int ret;
2848 struct ltt_kernel_channel *kchan;
2849 struct ltt_kernel_session *ksession;
2850 struct ltt_ust_session *usess;
2851
2852 /* Short cut */
2853 ksession = session->kernel_session;
2854 usess = session->ust_session;
2855
2856 if (!session->enabled)
2857 return LTTCOMM_UST_START_FAIL;
2858 session->enabled = 0;
2859
2860 /* Kernel tracer */
2861 if (ksession != NULL) {
2862 DBG("Stop kernel tracing");
2863
2864 /* Flush all buffers before stopping */
2865 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2866 if (ret < 0) {
2867 ERR("Kernel metadata flush failed");
2868 }
2869
2870 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2871 ret = kernel_flush_buffer(kchan);
2872 if (ret < 0) {
2873 ERR("Kernel flush buffer error");
2874 }
2875 }
2876
2877 ret = kernel_stop_session(ksession);
2878 if (ret < 0) {
2879 ret = LTTCOMM_KERN_STOP_FAIL;
2880 goto error;
2881 }
2882
2883 kernel_wait_quiescent(kernel_tracer_fd);
2884 }
2885
2886 if (usess) {
2887 usess->start_trace = 0;
2888
2889 ret = ust_app_stop_trace_all(usess);
2890 if (ret < 0) {
2891 ret = LTTCOMM_UST_START_FAIL;
2892 goto error;
2893 }
2894 }
2895
2896 ret = LTTCOMM_OK;
2897
2898 error:
2899 return ret;
2900 }
2901
2902 /*
2903 * Command LTTNG_CREATE_SESSION processed by the client thread.
2904 */
2905 static int cmd_create_session(char *name, char *path)
2906 {
2907 int ret;
2908
2909 ret = session_create(name, path);
2910 if (ret != LTTCOMM_OK) {
2911 goto error;
2912 }
2913
2914 ret = LTTCOMM_OK;
2915
2916 error:
2917 return ret;
2918 }
2919
2920 /*
2921 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2922 */
2923 static int cmd_destroy_session(struct ltt_session *session, char *name)
2924 {
2925 int ret;
2926
2927 /* Clean kernel session teardown */
2928 teardown_kernel_session(session);
2929 /* UST session teardown */
2930 teardown_ust_session(session);
2931
2932 /*
2933 * Must notify the kernel thread here to update it's poll setin order
2934 * to remove the channel(s)' fd just destroyed.
2935 */
2936 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2937 if (ret < 0) {
2938 perror("write kernel poll pipe");
2939 }
2940
2941 ret = session_destroy(session);
2942
2943 return ret;
2944 }
2945
2946 /*
2947 * Command LTTNG_CALIBRATE processed by the client thread.
2948 */
2949 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2950 {
2951 int ret;
2952
2953 switch (domain) {
2954 case LTTNG_DOMAIN_KERNEL:
2955 {
2956 struct lttng_kernel_calibrate kcalibrate;
2957
2958 kcalibrate.type = calibrate->type;
2959 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2960 if (ret < 0) {
2961 ret = LTTCOMM_KERN_ENABLE_FAIL;
2962 goto error;
2963 }
2964 break;
2965 }
2966 default:
2967 /* TODO: Userspace tracing */
2968 ret = LTTCOMM_NOT_IMPLEMENTED;
2969 goto error;
2970 }
2971
2972 ret = LTTCOMM_OK;
2973
2974 error:
2975 return ret;
2976 }
2977
2978 /*
2979 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2980 */
2981 static int cmd_register_consumer(struct ltt_session *session, int domain,
2982 char *sock_path)
2983 {
2984 int ret, sock;
2985
2986 switch (domain) {
2987 case LTTNG_DOMAIN_KERNEL:
2988 /* Can't register a consumer if there is already one */
2989 if (session->kernel_session->consumer_fd != 0) {
2990 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2991 goto error;
2992 }
2993
2994 sock = lttcomm_connect_unix_sock(sock_path);
2995 if (sock < 0) {
2996 ret = LTTCOMM_CONNECT_FAIL;
2997 goto error;
2998 }
2999
3000 session->kernel_session->consumer_fd = sock;
3001 break;
3002 default:
3003 /* TODO: Userspace tracing */
3004 ret = LTTCOMM_NOT_IMPLEMENTED;
3005 goto error;
3006 }
3007
3008 ret = LTTCOMM_OK;
3009
3010 error:
3011 return ret;
3012 }
3013
3014 /*
3015 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3016 */
3017 static ssize_t cmd_list_domains(struct ltt_session *session,
3018 struct lttng_domain **domains)
3019 {
3020 int ret, index = 0;
3021 ssize_t nb_dom = 0;
3022
3023 if (session->kernel_session != NULL) {
3024 DBG3("Listing domains found kernel domain");
3025 nb_dom++;
3026 }
3027
3028 if (session->ust_session != NULL) {
3029 DBG3("Listing domains found UST global domain");
3030 nb_dom++;
3031 }
3032
3033 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3034 if (*domains == NULL) {
3035 ret = -LTTCOMM_FATAL;
3036 goto error;
3037 }
3038
3039 if (session->kernel_session != NULL) {
3040 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3041 index++;
3042 }
3043
3044 if (session->ust_session != NULL) {
3045 (*domains)[index].type = LTTNG_DOMAIN_UST;
3046 index++;
3047 }
3048
3049 return nb_dom;
3050
3051 error:
3052 return ret;
3053 }
3054
3055 /*
3056 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3057 */
3058 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3059 struct lttng_channel **channels)
3060 {
3061 int ret;
3062 ssize_t nb_chan = 0;
3063
3064 switch (domain) {
3065 case LTTNG_DOMAIN_KERNEL:
3066 if (session->kernel_session != NULL) {
3067 nb_chan = session->kernel_session->channel_count;
3068 }
3069 DBG3("Number of kernel channels %zd", nb_chan);
3070 break;
3071 case LTTNG_DOMAIN_UST:
3072 if (session->ust_session != NULL) {
3073 nb_chan = hashtable_get_count(
3074 session->ust_session->domain_global.channels);
3075 }
3076 DBG3("Number of UST global channels %zd", nb_chan);
3077 break;
3078 default:
3079 *channels = NULL;
3080 ret = -LTTCOMM_NOT_IMPLEMENTED;
3081 goto error;
3082 }
3083
3084 if (nb_chan > 0) {
3085 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3086 if (*channels == NULL) {
3087 ret = -LTTCOMM_FATAL;
3088 goto error;
3089 }
3090
3091 list_lttng_channels(domain, session, *channels);
3092 } else {
3093 *channels = NULL;
3094 }
3095
3096 return nb_chan;
3097
3098 error:
3099 return ret;
3100 }
3101
3102 /*
3103 * Command LTTNG_LIST_EVENTS processed by the client thread.
3104 */
3105 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3106 char *channel_name, struct lttng_event **events)
3107 {
3108 int ret = 0;
3109 ssize_t nb_event = 0;
3110
3111 switch (domain) {
3112 case LTTNG_DOMAIN_KERNEL:
3113 if (session->kernel_session != NULL) {
3114 nb_event = list_lttng_kernel_events(channel_name,
3115 session->kernel_session, events);
3116 }
3117 break;
3118 case LTTNG_DOMAIN_UST:
3119 {
3120 if (session->ust_session != NULL) {
3121 nb_event = list_lttng_ust_global_events(channel_name,
3122 &session->ust_session->domain_global, events);
3123 }
3124 break;
3125 }
3126 default:
3127 ret = -LTTCOMM_NOT_IMPLEMENTED;
3128 goto error;
3129 }
3130
3131 ret = nb_event;
3132
3133 error:
3134 return ret;
3135 }
3136
3137 /*
3138 * Process the command requested by the lttng client within the command
3139 * context structure. This function make sure that the return structure (llm)
3140 * is set and ready for transmission before returning.
3141 *
3142 * Return any error encountered or 0 for success.
3143 */
3144 static int process_client_msg(struct command_ctx *cmd_ctx)
3145 {
3146 int ret = LTTCOMM_OK;
3147 int need_tracing_session = 1;
3148
3149 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3150
3151 /*
3152 * Check for command that don't needs to allocate a returned payload. We do
3153 * this here so we don't have to make the call for no payload at each
3154 * command.
3155 */
3156 switch(cmd_ctx->lsm->cmd_type) {
3157 case LTTNG_LIST_SESSIONS:
3158 case LTTNG_LIST_TRACEPOINTS:
3159 case LTTNG_LIST_DOMAINS:
3160 case LTTNG_LIST_CHANNELS:
3161 case LTTNG_LIST_EVENTS:
3162 break;
3163 default:
3164 /* Setup lttng message with no payload */
3165 ret = setup_lttng_msg(cmd_ctx, 0);
3166 if (ret < 0) {
3167 /* This label does not try to unlock the session */
3168 goto init_setup_error;
3169 }
3170 }
3171
3172 /* Commands that DO NOT need a session. */
3173 switch (cmd_ctx->lsm->cmd_type) {
3174 case LTTNG_CALIBRATE:
3175 case LTTNG_CREATE_SESSION:
3176 case LTTNG_LIST_SESSIONS:
3177 case LTTNG_LIST_TRACEPOINTS:
3178 need_tracing_session = 0;
3179 break;
3180 default:
3181 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3182 session_lock_list();
3183 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3184 session_unlock_list();
3185 if (cmd_ctx->session == NULL) {
3186 if (cmd_ctx->lsm->session.name != NULL) {
3187 ret = LTTCOMM_SESS_NOT_FOUND;
3188 } else {
3189 /* If no session name specified */
3190 ret = LTTCOMM_SELECT_SESS;
3191 }
3192 goto error;
3193 } else {
3194 /* Acquire lock for the session */
3195 session_lock(cmd_ctx->session);
3196 }
3197 break;
3198 }
3199
3200 /*
3201 * Check domain type for specific "pre-action".
3202 */
3203 switch (cmd_ctx->lsm->domain.type) {
3204 case LTTNG_DOMAIN_KERNEL:
3205 /* Kernel tracer check */
3206 if (kernel_tracer_fd == 0) {
3207 /* Basically, load kernel tracer modules */
3208 init_kernel_tracer();
3209 if (kernel_tracer_fd == 0) {
3210 ret = LTTCOMM_KERN_NA;
3211 goto error;
3212 }
3213 }
3214
3215 /* Need a session for kernel command */
3216 if (need_tracing_session) {
3217 if (cmd_ctx->session->kernel_session == NULL) {
3218 ret = create_kernel_session(cmd_ctx->session);
3219 if (ret < 0) {
3220 ret = LTTCOMM_KERN_SESS_FAIL;
3221 goto error;
3222 }
3223 }
3224
3225 /* Start the kernel consumer daemon */
3226 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3227 if (kconsumer_data.pid == 0 &&
3228 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3229 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3230 ret = start_consumerd(&kconsumer_data);
3231 if (ret < 0) {
3232 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3233 goto error;
3234 }
3235 } else {
3236 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3237 }
3238 }
3239 break;
3240 case LTTNG_DOMAIN_UST:
3241 {
3242 if (need_tracing_session) {
3243 if (cmd_ctx->session->ust_session == NULL) {
3244 ret = create_ust_session(cmd_ctx->session,
3245 &cmd_ctx->lsm->domain);
3246 if (ret != LTTCOMM_OK) {
3247 goto error;
3248 }
3249 }
3250 /* Start the UST consumer daemons */
3251 /* 64-bit */
3252 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3253 if (consumerd64_path[0] != '\0' &&
3254 ustconsumer64_data.pid == 0 &&
3255 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3256 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3257 ret = start_consumerd(&ustconsumer64_data);
3258 if (ret < 0) {
3259 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3260 ust_consumerd64_fd = -EINVAL;
3261 goto error;
3262 }
3263
3264 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3265 } else {
3266 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3267 }
3268 /* 32-bit */
3269 if (consumerd32_path[0] != '\0' &&
3270 ustconsumer32_data.pid == 0 &&
3271 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3272 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3273 ret = start_consumerd(&ustconsumer32_data);
3274 if (ret < 0) {
3275 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3276 ust_consumerd32_fd = -EINVAL;
3277 goto error;
3278 }
3279 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3280 } else {
3281 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3282 }
3283 }
3284 break;
3285 }
3286 default:
3287 break;
3288 }
3289
3290 /* Process by command type */
3291 switch (cmd_ctx->lsm->cmd_type) {
3292 case LTTNG_ADD_CONTEXT:
3293 {
3294 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3295 cmd_ctx->lsm->u.context.channel_name,
3296 cmd_ctx->lsm->u.context.event_name,
3297 &cmd_ctx->lsm->u.context.ctx);
3298 break;
3299 }
3300 case LTTNG_DISABLE_CHANNEL:
3301 {
3302 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3303 cmd_ctx->lsm->u.disable.channel_name);
3304 break;
3305 }
3306 case LTTNG_DISABLE_EVENT:
3307 {
3308 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3309 cmd_ctx->lsm->u.disable.channel_name,
3310 cmd_ctx->lsm->u.disable.name);
3311 ret = LTTCOMM_OK;
3312 break;
3313 }
3314 case LTTNG_DISABLE_ALL_EVENT:
3315 {
3316 DBG("Disabling all events");
3317
3318 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3319 cmd_ctx->lsm->u.disable.channel_name);
3320 break;
3321 }
3322 case LTTNG_ENABLE_CHANNEL:
3323 {
3324 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3325 &cmd_ctx->lsm->u.channel.chan);
3326 break;
3327 }
3328 case LTTNG_ENABLE_EVENT:
3329 {
3330 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3331 cmd_ctx->lsm->u.enable.channel_name,
3332 &cmd_ctx->lsm->u.enable.event);
3333 break;
3334 }
3335 case LTTNG_ENABLE_ALL_EVENT:
3336 {
3337 DBG("Enabling all events");
3338
3339 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3340 cmd_ctx->lsm->u.enable.channel_name,
3341 cmd_ctx->lsm->u.enable.event.type);
3342 break;
3343 }
3344 case LTTNG_LIST_TRACEPOINTS:
3345 {
3346 struct lttng_event *events;
3347 ssize_t nb_events;
3348
3349 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3350 if (nb_events < 0) {
3351 ret = -nb_events;
3352 goto error;
3353 }
3354
3355 /*
3356 * Setup lttng message with payload size set to the event list size in
3357 * bytes and then copy list into the llm payload.
3358 */
3359 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3360 if (ret < 0) {
3361 free(events);
3362 goto setup_error;
3363 }
3364
3365 /* Copy event list into message payload */
3366 memcpy(cmd_ctx->llm->payload, events,
3367 sizeof(struct lttng_event) * nb_events);
3368
3369 free(events);
3370
3371 ret = LTTCOMM_OK;
3372 break;
3373 }
3374 case LTTNG_START_TRACE:
3375 {
3376 ret = cmd_start_trace(cmd_ctx->session);
3377 break;
3378 }
3379 case LTTNG_STOP_TRACE:
3380 {
3381 ret = cmd_stop_trace(cmd_ctx->session);
3382 break;
3383 }
3384 case LTTNG_CREATE_SESSION:
3385 {
3386 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3387 cmd_ctx->lsm->session.path);
3388 break;
3389 }
3390 case LTTNG_DESTROY_SESSION:
3391 {
3392 ret = cmd_destroy_session(cmd_ctx->session,
3393 cmd_ctx->lsm->session.name);
3394 break;
3395 }
3396 case LTTNG_LIST_DOMAINS:
3397 {
3398 ssize_t nb_dom;
3399 struct lttng_domain *domains;
3400
3401 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3402 if (nb_dom < 0) {
3403 ret = -nb_dom;
3404 goto error;
3405 }
3406
3407 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3408 if (ret < 0) {
3409 goto setup_error;
3410 }
3411
3412 /* Copy event list into message payload */
3413 memcpy(cmd_ctx->llm->payload, domains,
3414 nb_dom * sizeof(struct lttng_domain));
3415
3416 free(domains);
3417
3418 ret = LTTCOMM_OK;
3419 break;
3420 }
3421 case LTTNG_LIST_CHANNELS:
3422 {
3423 size_t nb_chan;
3424 struct lttng_channel *channels;
3425
3426 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3427 cmd_ctx->session, &channels);
3428 if (nb_chan < 0) {
3429 ret = -nb_chan;
3430 goto error;
3431 }
3432
3433 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3434 if (ret < 0) {
3435 goto setup_error;
3436 }
3437
3438 /* Copy event list into message payload */
3439 memcpy(cmd_ctx->llm->payload, channels,
3440 nb_chan * sizeof(struct lttng_channel));
3441
3442 free(channels);
3443
3444 ret = LTTCOMM_OK;
3445 break;
3446 }
3447 case LTTNG_LIST_EVENTS:
3448 {
3449 ssize_t nb_event;
3450 struct lttng_event *events = NULL;
3451
3452 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3453 cmd_ctx->lsm->u.list.channel_name, &events);
3454 if (nb_event < 0) {
3455 ret = -nb_event;
3456 goto error;
3457 }
3458
3459 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3460 if (ret < 0) {
3461 goto setup_error;
3462 }
3463
3464 /* Copy event list into message payload */
3465 memcpy(cmd_ctx->llm->payload, events,
3466 nb_event * sizeof(struct lttng_event));
3467
3468 free(events);
3469
3470 ret = LTTCOMM_OK;
3471 break;
3472 }
3473 case LTTNG_LIST_SESSIONS:
3474 {
3475 session_lock_list();
3476
3477 if (session_list_ptr->count == 0) {
3478 ret = LTTCOMM_NO_SESSION;
3479 session_unlock_list();
3480 goto error;
3481 }
3482
3483 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3484 session_list_ptr->count);
3485 if (ret < 0) {
3486 session_unlock_list();
3487 goto setup_error;
3488 }
3489
3490 /* Filled the session array */
3491 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3492
3493 session_unlock_list();
3494
3495 ret = LTTCOMM_OK;
3496 break;
3497 }
3498 case LTTNG_CALIBRATE:
3499 {
3500 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3501 &cmd_ctx->lsm->u.calibrate);
3502 break;
3503 }
3504 case LTTNG_REGISTER_CONSUMER:
3505 {
3506 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3507 cmd_ctx->lsm->u.reg.path);
3508 break;
3509 }
3510 default:
3511 ret = LTTCOMM_UND;
3512 break;
3513 }
3514
3515 error:
3516 if (cmd_ctx->llm == NULL) {
3517 DBG("Missing llm structure. Allocating one.");
3518 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3519 goto setup_error;
3520 }
3521 }
3522 /* Set return code */
3523 cmd_ctx->llm->ret_code = ret;
3524 setup_error:
3525 if (cmd_ctx->session) {
3526 session_unlock(cmd_ctx->session);
3527 }
3528 init_setup_error:
3529 return ret;
3530 }
3531
3532 /*
3533 * This thread manage all clients request using the unix client socket for
3534 * communication.
3535 */
3536 static void *thread_manage_clients(void *data)
3537 {
3538 int sock = 0, ret, i, pollfd;
3539 uint32_t revents, nb_fd;
3540 struct command_ctx *cmd_ctx = NULL;
3541 struct lttng_poll_event events;
3542
3543 DBG("[thread] Manage client started");
3544
3545 rcu_register_thread();
3546
3547 ret = lttcomm_listen_unix_sock(client_sock);
3548 if (ret < 0) {
3549 goto error;
3550 }
3551
3552 /*
3553 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3554 * more will be added to this poll set.
3555 */
3556 ret = create_thread_poll_set(&events, 2);
3557 if (ret < 0) {
3558 goto error;
3559 }
3560
3561 /* Add the application registration socket */
3562 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3563 if (ret < 0) {
3564 goto error;
3565 }
3566
3567 /*
3568 * Notify parent pid that we are ready to accept command for client side.
3569 */
3570 if (opt_sig_parent) {
3571 kill(ppid, SIGCHLD);
3572 }
3573
3574 while (1) {
3575 DBG("Accepting client command ...");
3576
3577 nb_fd = LTTNG_POLL_GETNB(&events);
3578
3579 /* Inifinite blocking call, waiting for transmission */
3580 ret = lttng_poll_wait(&events, -1);
3581 if (ret < 0) {
3582 goto error;
3583 }
3584
3585 for (i = 0; i < nb_fd; i++) {
3586 /* Fetch once the poll data */
3587 revents = LTTNG_POLL_GETEV(&events, i);
3588 pollfd = LTTNG_POLL_GETFD(&events, i);
3589
3590 /* Thread quit pipe has been closed. Killing thread. */
3591 ret = check_thread_quit_pipe(pollfd, revents);
3592 if (ret) {
3593 goto error;
3594 }
3595
3596 /* Event on the registration socket */
3597 if (pollfd == client_sock) {
3598 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3599 ERR("Client socket poll error");
3600 goto error;
3601 }
3602 }
3603 }
3604
3605 DBG("Wait for client response");
3606
3607 sock = lttcomm_accept_unix_sock(client_sock);
3608 if (sock < 0) {
3609 goto error;
3610 }
3611
3612 /* Allocate context command to process the client request */
3613 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3614 if (cmd_ctx == NULL) {
3615 perror("zmalloc cmd_ctx");
3616 goto error;
3617 }
3618
3619 /* Allocate data buffer for reception */
3620 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3621 if (cmd_ctx->lsm == NULL) {
3622 perror("zmalloc cmd_ctx->lsm");
3623 goto error;
3624 }
3625
3626 cmd_ctx->llm = NULL;
3627 cmd_ctx->session = NULL;
3628
3629 /*
3630 * Data is received from the lttng client. The struct
3631 * lttcomm_session_msg (lsm) contains the command and data request of
3632 * the client.
3633 */
3634 DBG("Receiving data from client ...");
3635 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3636 sizeof(struct lttcomm_session_msg));
3637 if (ret <= 0) {
3638 DBG("Nothing recv() from client... continuing");
3639 close(sock);
3640 free(cmd_ctx);
3641 continue;
3642 }
3643
3644 // TODO: Validate cmd_ctx including sanity check for
3645 // security purpose.
3646
3647 rcu_thread_online();
3648 /*
3649 * This function dispatch the work to the kernel or userspace tracer
3650 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3651 * informations for the client. The command context struct contains
3652 * everything this function may needs.
3653 */
3654 ret = process_client_msg(cmd_ctx);
3655 rcu_thread_offline();
3656 if (ret < 0) {
3657 /*
3658 * TODO: Inform client somehow of the fatal error. At
3659 * this point, ret < 0 means that a zmalloc failed
3660 * (ENOMEM). Error detected but still accept command.
3661 */
3662 clean_command_ctx(&cmd_ctx);
3663 continue;
3664 }
3665
3666 DBG("Sending response (size: %d, retcode: %s)",
3667 cmd_ctx->lttng_msg_size,
3668 lttng_strerror(-cmd_ctx->llm->ret_code));
3669 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3670 if (ret < 0) {
3671 ERR("Failed to send data back to client");
3672 }
3673
3674 clean_command_ctx(&cmd_ctx);
3675
3676 /* End of transmission */
3677 close(sock);
3678 }
3679
3680 error:
3681 DBG("Client thread dying");
3682 unlink(client_unix_sock_path);
3683 close(client_sock);
3684 close(sock);
3685
3686 lttng_poll_clean(&events);
3687 clean_command_ctx(&cmd_ctx);
3688
3689 rcu_unregister_thread();
3690 return NULL;
3691 }
3692
3693
3694 /*
3695 * usage function on stderr
3696 */
3697 static void usage(void)
3698 {
3699 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3700 fprintf(stderr, " -h, --help Display this usage.\n");
3701 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3702 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3703 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3704 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3705 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3706 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3707 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3708 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3709 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3710 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3711 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3712 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3713 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3714 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3715 fprintf(stderr, " -V, --version Show version number.\n");
3716 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3717 fprintf(stderr, " -q, --quiet No output at all.\n");
3718 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3719 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3720 }
3721
3722 /*
3723 * daemon argument parsing
3724 */
3725 static int parse_args(int argc, char **argv)
3726 {
3727 int c;
3728
3729 static struct option long_options[] = {
3730 { "client-sock", 1, 0, 'c' },
3731 { "apps-sock", 1, 0, 'a' },
3732 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3733 { "kconsumerd-err-sock", 1, 0, 'E' },
3734 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3735 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3736 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3737 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3738 { "consumerd32-path", 1, 0, 'u' },
3739 { "consumerd32-libdir", 1, 0, 'U' },
3740 { "consumerd64-path", 1, 0, 't' },
3741 { "consumerd64-libdir", 1, 0, 'T' },
3742 { "daemonize", 0, 0, 'd' },
3743 { "sig-parent", 0, 0, 'S' },
3744 { "help", 0, 0, 'h' },
3745 { "group", 1, 0, 'g' },
3746 { "version", 0, 0, 'V' },
3747 { "quiet", 0, 0, 'q' },
3748 { "verbose", 0, 0, 'v' },
3749 { "verbose-consumer", 0, 0, 'Z' },
3750 { NULL, 0, 0, 0 }
3751 };
3752
3753 while (1) {
3754 int option_index = 0;
3755 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3756 long_options, &option_index);
3757 if (c == -1) {
3758 break;
3759 }
3760
3761 switch (c) {
3762 case 0:
3763 fprintf(stderr, "option %s", long_options[option_index].name);
3764 if (optarg) {
3765 fprintf(stderr, " with arg %s\n", optarg);
3766 }
3767 break;
3768 case 'c':
3769 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3770 break;
3771 case 'a':
3772 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3773 break;
3774 case 'd':
3775 opt_daemon = 1;
3776 break;
3777 case 'g':
3778 opt_tracing_group = optarg;
3779 break;
3780 case 'h':
3781 usage();
3782 exit(EXIT_FAILURE);
3783 case 'V':
3784 fprintf(stdout, "%s\n", VERSION);
3785 exit(EXIT_SUCCESS);
3786 case 'S':
3787 opt_sig_parent = 1;
3788 break;
3789 case 'E':
3790 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3791 break;
3792 case 'C':
3793 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3794 break;
3795 case 'F':
3796 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3797 break;
3798 case 'D':
3799 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3800 break;
3801 case 'H':
3802 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3803 break;
3804 case 'G':
3805 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3806 break;
3807 case 'q':
3808 opt_quiet = 1;
3809 break;
3810 case 'v':
3811 /* Verbose level can increase using multiple -v */
3812 opt_verbose += 1;
3813 break;
3814 case 'Z':
3815 opt_verbose_consumer += 1;
3816 break;
3817 case 'u':
3818 consumerd32_path= optarg;
3819 break;
3820 case 'U':
3821 consumerd32_libdir = optarg;
3822 break;
3823 case 't':
3824 consumerd64_path = optarg;
3825 break;
3826 case 'T':
3827 consumerd64_libdir = optarg;
3828 break;
3829 default:
3830 /* Unknown option or other error.
3831 * Error is printed by getopt, just return */
3832 return -1;
3833 }
3834 }
3835
3836 return 0;
3837 }
3838
3839 /*
3840 * Creates the two needed socket by the daemon.
3841 * apps_sock - The communication socket for all UST apps.
3842 * client_sock - The communication of the cli tool (lttng).
3843 */
3844 static int init_daemon_socket(void)
3845 {
3846 int ret = 0;
3847 mode_t old_umask;
3848
3849 old_umask = umask(0);
3850
3851 /* Create client tool unix socket */
3852 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3853 if (client_sock < 0) {
3854 ERR("Create unix sock failed: %s", client_unix_sock_path);
3855 ret = -1;
3856 goto end;
3857 }
3858
3859 /* File permission MUST be 660 */
3860 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3861 if (ret < 0) {
3862 ERR("Set file permissions failed: %s", client_unix_sock_path);
3863 perror("chmod");
3864 goto end;
3865 }
3866
3867 /* Create the application unix socket */
3868 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3869 if (apps_sock < 0) {
3870 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3871 ret = -1;
3872 goto end;
3873 }
3874
3875 /* File permission MUST be 666 */
3876 ret = chmod(apps_unix_sock_path,
3877 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3878 if (ret < 0) {
3879 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3880 perror("chmod");
3881 goto end;
3882 }
3883
3884 end:
3885 umask(old_umask);
3886 return ret;
3887 }
3888
3889 /*
3890 * Check if the global socket is available, and if a daemon is answering at the
3891 * other side. If yes, error is returned.
3892 */
3893 static int check_existing_daemon(void)
3894 {
3895 if (access(client_unix_sock_path, F_OK) < 0 &&
3896 access(apps_unix_sock_path, F_OK) < 0) {
3897 return 0;
3898 }
3899
3900 /* Is there anybody out there ? */
3901 if (lttng_session_daemon_alive()) {
3902 return -EEXIST;
3903 } else {
3904 return 0;
3905 }
3906 }
3907
3908 /*
3909 * Set the tracing group gid onto the client socket.
3910 *
3911 * Race window between mkdir and chown is OK because we are going from more
3912 * permissive (root.root) to les permissive (root.tracing).
3913 */
3914 static int set_permissions(void)
3915 {
3916 int ret;
3917 gid_t gid;
3918
3919 gid = allowed_group();
3920 if (gid < 0) {
3921 if (is_root) {
3922 WARN("No tracing group detected");
3923 ret = 0;
3924 } else {
3925 ERR("Missing tracing group. Aborting execution.");
3926 ret = -1;
3927 }
3928 goto end;
3929 }
3930
3931 /* Set lttng run dir */
3932 ret = chown(LTTNG_RUNDIR, 0, gid);
3933 if (ret < 0) {
3934 ERR("Unable to set group on " LTTNG_RUNDIR);
3935 perror("chown");
3936 }
3937
3938 /* lttng client socket path */
3939 ret = chown(client_unix_sock_path, 0, gid);
3940 if (ret < 0) {
3941 ERR("Unable to set group on %s", client_unix_sock_path);
3942 perror("chown");
3943 }
3944
3945 /* kconsumer error socket path */
3946 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3947 if (ret < 0) {
3948 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3949 perror("chown");
3950 }
3951
3952 /* 64-bit ustconsumer error socket path */
3953 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3954 if (ret < 0) {
3955 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3956 perror("chown");
3957 }
3958
3959 /* 32-bit ustconsumer compat32 error socket path */
3960 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3961 if (ret < 0) {
3962 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3963 perror("chown");
3964 }
3965
3966 DBG("All permissions are set");
3967
3968 end:
3969 return ret;
3970 }
3971
3972 /*
3973 * Create the pipe used to wake up the kernel thread.
3974 */
3975 static int create_kernel_poll_pipe(void)
3976 {
3977 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3978 }
3979
3980 /*
3981 * Create the application command pipe to wake thread_manage_apps.
3982 */
3983 static int create_apps_cmd_pipe(void)
3984 {
3985 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3986 }
3987
3988 /*
3989 * Create the lttng run directory needed for all global sockets and pipe.
3990 */
3991 static int create_lttng_rundir(void)
3992 {
3993 int ret;
3994
3995 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3996 if (ret < 0) {
3997 if (errno != EEXIST) {
3998 ERR("Unable to create " LTTNG_RUNDIR);
3999 goto error;
4000 } else {
4001 ret = 0;
4002 }
4003 }
4004
4005 error:
4006 return ret;
4007 }
4008
4009 /*
4010 * Setup sockets and directory needed by the kconsumerd communication with the
4011 * session daemon.
4012 */
4013 static int set_consumer_sockets(struct consumer_data *consumer_data)
4014 {
4015 int ret;
4016 const char *path;
4017
4018 switch (consumer_data->type) {
4019 case LTTNG_CONSUMER_KERNEL:
4020 path = KCONSUMERD_PATH;
4021 break;
4022 case LTTNG_CONSUMER64_UST:
4023 path = USTCONSUMERD64_PATH;
4024 break;
4025 case LTTNG_CONSUMER32_UST:
4026 path = USTCONSUMERD32_PATH;
4027 break;
4028 default:
4029 ERR("Consumer type unknown");
4030 ret = -EINVAL;
4031 goto error;
4032 }
4033
4034 ret = mkdir(path, S_IRWXU | S_IRWXG);
4035 if (ret < 0) {
4036 if (errno != EEXIST) {
4037 ERR("Failed to create %s", path);
4038 goto error;
4039 }
4040 ret = 0;
4041 }
4042
4043 /* Create the kconsumerd error unix socket */
4044 consumer_data->err_sock =
4045 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4046 if (consumer_data->err_sock < 0) {
4047 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4048 ret = -1;
4049 goto error;
4050 }
4051
4052 /* File permission MUST be 660 */
4053 ret = chmod(consumer_data->err_unix_sock_path,
4054 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4055 if (ret < 0) {
4056 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4057 perror("chmod");
4058 goto error;
4059 }
4060
4061 error:
4062 return ret;
4063 }
4064
4065 /*
4066 * Signal handler for the daemon
4067 *
4068 * Simply stop all worker threads, leaving main() return gracefully after
4069 * joining all threads and calling cleanup().
4070 */
4071 static void sighandler(int sig)
4072 {
4073 switch (sig) {
4074 case SIGPIPE:
4075 DBG("SIGPIPE catched");
4076 return;
4077 case SIGINT:
4078 DBG("SIGINT catched");
4079 stop_threads();
4080 break;
4081 case SIGTERM:
4082 DBG("SIGTERM catched");
4083 stop_threads();
4084 break;
4085 default:
4086 break;
4087 }
4088 }
4089
4090 /*
4091 * Setup signal handler for :
4092 * SIGINT, SIGTERM, SIGPIPE
4093 */
4094 static int set_signal_handler(void)
4095 {
4096 int ret = 0;
4097 struct sigaction sa;
4098 sigset_t sigset;
4099
4100 if ((ret = sigemptyset(&sigset)) < 0) {
4101 perror("sigemptyset");
4102 return ret;
4103 }
4104
4105 sa.sa_handler = sighandler;
4106 sa.sa_mask = sigset;
4107 sa.sa_flags = 0;
4108 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4109 perror("sigaction");
4110 return ret;
4111 }
4112
4113 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4114 perror("sigaction");
4115 return ret;
4116 }
4117
4118 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4119 perror("sigaction");
4120 return ret;
4121 }
4122
4123 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4124
4125 return ret;
4126 }
4127
4128 /*
4129 * Set open files limit to unlimited. This daemon can open a large number of
4130 * file descriptors in order to consumer multiple kernel traces.
4131 */
4132 static void set_ulimit(void)
4133 {
4134 int ret;
4135 struct rlimit lim;
4136
4137 /* The kernel does not allowed an infinite limit for open files */
4138 lim.rlim_cur = 65535;
4139 lim.rlim_max = 65535;
4140
4141 ret = setrlimit(RLIMIT_NOFILE, &lim);
4142 if (ret < 0) {
4143 perror("failed to set open files limit");
4144 }
4145 }
4146
4147 /*
4148 * main
4149 */
4150 int main(int argc, char **argv)
4151 {
4152 int ret = 0;
4153 void *status;
4154 const char *home_path;
4155
4156 rcu_register_thread();
4157
4158 /* Create thread quit pipe */
4159 if ((ret = init_thread_quit_pipe()) < 0) {
4160 goto error;
4161 }
4162
4163 setup_consumerd_path();
4164
4165 /* Parse arguments */
4166 progname = argv[0];
4167 if ((ret = parse_args(argc, argv) < 0)) {
4168 goto error;
4169 }
4170
4171 /* Daemonize */
4172 if (opt_daemon) {
4173 ret = daemon(0, 0);
4174 if (ret < 0) {
4175 perror("daemon");
4176 goto error;
4177 }
4178 }
4179
4180 /* Check if daemon is UID = 0 */
4181 is_root = !getuid();
4182
4183 if (is_root) {
4184 ret = create_lttng_rundir();
4185 if (ret < 0) {
4186 goto error;
4187 }
4188
4189 if (strlen(apps_unix_sock_path) == 0) {
4190 snprintf(apps_unix_sock_path, PATH_MAX,
4191 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4192 }
4193
4194 if (strlen(client_unix_sock_path) == 0) {
4195 snprintf(client_unix_sock_path, PATH_MAX,
4196 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4197 }
4198
4199 /* Set global SHM for ust */
4200 if (strlen(wait_shm_path) == 0) {
4201 snprintf(wait_shm_path, PATH_MAX,
4202 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4203 }
4204 } else {
4205 home_path = get_home_dir();
4206 if (home_path == NULL) {
4207 /* TODO: Add --socket PATH option */
4208 ERR("Can't get HOME directory for sockets creation.");
4209 ret = -EPERM;
4210 goto error;
4211 }
4212
4213 if (strlen(apps_unix_sock_path) == 0) {
4214 snprintf(apps_unix_sock_path, PATH_MAX,
4215 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4216 }
4217
4218 /* Set the cli tool unix socket path */
4219 if (strlen(client_unix_sock_path) == 0) {
4220 snprintf(client_unix_sock_path, PATH_MAX,
4221 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4222 }
4223
4224 /* Set global SHM for ust */
4225 if (strlen(wait_shm_path) == 0) {
4226 snprintf(wait_shm_path, PATH_MAX,
4227 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4228 }
4229 }
4230
4231 DBG("Client socket path %s", client_unix_sock_path);
4232 DBG("Application socket path %s", apps_unix_sock_path);
4233
4234 /*
4235 * See if daemon already exist.
4236 */
4237 if ((ret = check_existing_daemon()) < 0) {
4238 ERR("Already running daemon.\n");
4239 /*
4240 * We do not goto exit because we must not cleanup()
4241 * because a daemon is already running.
4242 */
4243 goto error;
4244 }
4245
4246 /* After this point, we can safely call cleanup() with "goto exit" */
4247
4248 /*
4249 * These actions must be executed as root. We do that *after* setting up
4250 * the sockets path because we MUST make the check for another daemon using
4251 * those paths *before* trying to set the kernel consumer sockets and init
4252 * kernel tracer.
4253 */
4254 if (is_root) {
4255 ret = set_consumer_sockets(&kconsumer_data);
4256 if (ret < 0) {
4257 goto exit;
4258 }
4259
4260 ret = set_consumer_sockets(&ustconsumer64_data);
4261 if (ret < 0) {
4262 goto exit;
4263 }
4264
4265 ret = set_consumer_sockets(&ustconsumer32_data);
4266 if (ret < 0) {
4267 goto exit;
4268 }
4269
4270 /* Setup kernel tracer */
4271 init_kernel_tracer();
4272
4273 /* Set ulimit for open files */
4274 set_ulimit();
4275 }
4276
4277 if ((ret = set_signal_handler()) < 0) {
4278 goto exit;
4279 }
4280
4281 /* Setup the needed unix socket */
4282 if ((ret = init_daemon_socket()) < 0) {
4283 goto exit;
4284 }
4285
4286 /* Set credentials to socket */
4287 if (is_root && ((ret = set_permissions()) < 0)) {
4288 goto exit;
4289 }
4290
4291 /* Get parent pid if -S, --sig-parent is specified. */
4292 if (opt_sig_parent) {
4293 ppid = getppid();
4294 }
4295
4296 /* Setup the kernel pipe for waking up the kernel thread */
4297 if ((ret = create_kernel_poll_pipe()) < 0) {
4298 goto exit;
4299 }
4300
4301 /* Setup the thread apps communication pipe. */
4302 if ((ret = create_apps_cmd_pipe()) < 0) {
4303 goto exit;
4304 }
4305
4306 /* Init UST command queue. */
4307 cds_wfq_init(&ust_cmd_queue.queue);
4308
4309 /* Init UST app hash table */
4310 ust_app_ht_alloc();
4311
4312 /*
4313 * Get session list pointer. This pointer MUST NOT be free(). This list is
4314 * statically declared in session.c
4315 */
4316 session_list_ptr = session_get_list();
4317
4318 /* Set up max poll set size */
4319 lttng_poll_set_max_size();
4320
4321 /* Create thread to manage the client socket */
4322 ret = pthread_create(&client_thread, NULL,
4323 thread_manage_clients, (void *) NULL);
4324 if (ret != 0) {
4325 perror("pthread_create clients");
4326 goto exit_client;
4327 }
4328
4329 /* Create thread to dispatch registration */
4330 ret = pthread_create(&dispatch_thread, NULL,
4331 thread_dispatch_ust_registration, (void *) NULL);
4332 if (ret != 0) {
4333 perror("pthread_create dispatch");
4334 goto exit_dispatch;
4335 }
4336
4337 /* Create thread to manage application registration. */
4338 ret = pthread_create(&reg_apps_thread, NULL,
4339 thread_registration_apps, (void *) NULL);
4340 if (ret != 0) {
4341 perror("pthread_create registration");
4342 goto exit_reg_apps;
4343 }
4344
4345 /* Create thread to manage application socket */
4346 ret = pthread_create(&apps_thread, NULL,
4347 thread_manage_apps, (void *) NULL);
4348 if (ret != 0) {
4349 perror("pthread_create apps");
4350 goto exit_apps;
4351 }
4352
4353 /* Create kernel thread to manage kernel event */
4354 ret = pthread_create(&kernel_thread, NULL,
4355 thread_manage_kernel, (void *) NULL);
4356 if (ret != 0) {
4357 perror("pthread_create kernel");
4358 goto exit_kernel;
4359 }
4360
4361 ret = pthread_join(kernel_thread, &status);
4362 if (ret != 0) {
4363 perror("pthread_join");
4364 goto error; /* join error, exit without cleanup */
4365 }
4366
4367 exit_kernel:
4368 ret = pthread_join(apps_thread, &status);
4369 if (ret != 0) {
4370 perror("pthread_join");
4371 goto error; /* join error, exit without cleanup */
4372 }
4373
4374 exit_apps:
4375 ret = pthread_join(reg_apps_thread, &status);
4376 if (ret != 0) {
4377 perror("pthread_join");
4378 goto error; /* join error, exit without cleanup */
4379 }
4380
4381 exit_reg_apps:
4382 ret = pthread_join(dispatch_thread, &status);
4383 if (ret != 0) {
4384 perror("pthread_join");
4385 goto error; /* join error, exit without cleanup */
4386 }
4387
4388 exit_dispatch:
4389 ret = pthread_join(client_thread, &status);
4390 if (ret != 0) {
4391 perror("pthread_join");
4392 goto error; /* join error, exit without cleanup */
4393 }
4394
4395 ret = join_consumer_thread(&kconsumer_data);
4396 if (ret != 0) {
4397 perror("join_consumer");
4398 goto error; /* join error, exit without cleanup */
4399 }
4400
4401 exit_client:
4402 exit:
4403 /*
4404 * cleanup() is called when no other thread is running.
4405 */
4406 rcu_thread_online();
4407 cleanup();
4408 rcu_thread_offline();
4409 rcu_unregister_thread();
4410 if (!ret)
4411 exit(EXIT_SUCCESS);
4412 error:
4413 exit(EXIT_FAILURE);
4414 }
LTTng 2.0 tools and control repository
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