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Merge branch 'master' into benchmark
[lttng-tools.git] / lttng-sessiond / main.c
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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-ht.h>
43#include <lttng-sessiond-comm.h>
44#include <lttng/lttng-consumer.h>
45
46#include <lttngerr.h>
47#include <runas.h>
48
49#include "channel.h"
50#include "compat/poll.h"
51#include "context.h"
52#include "event.h"
53#include "futex.h"
54#include "kernel.h"
55#include "lttng-sessiond.h"
56#include "shm.h"
57#include "ust-app.h"
58#include "ust-ctl.h"
59#include "utils.h"
60
61#define CONSUMERD_FILE "lttng-consumerd"
62
63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
80
81#include "benchmark.h"
82
83/* Const values */
84const char default_home_dir[] = DEFAULT_HOME_DIR;
85const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
86const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
87const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
88
89/* Variables */
90int opt_verbose; /* Not static for lttngerr.h */
91int opt_verbose_consumer; /* Not static for lttngerr.h */
92int opt_quiet; /* Not static for lttngerr.h */
93
94const char *progname;
95const char *opt_tracing_group;
96static int opt_sig_parent;
97static int opt_daemon;
98static int opt_no_kernel;
99static int is_root; /* Set to 1 if the daemon is running as root */
100static pid_t ppid; /* Parent PID for --sig-parent option */
101static char *rundir;
102
103/* Consumer daemon specific control data */
104static struct consumer_data kconsumer_data = {
105 .type = LTTNG_CONSUMER_KERNEL,
106 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
108};
109static struct consumer_data ustconsumer64_data = {
110 .type = LTTNG_CONSUMER64_UST,
111 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
113};
114static struct consumer_data ustconsumer32_data = {
115 .type = LTTNG_CONSUMER32_UST,
116 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
117 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
118};
119
120static int dispatch_thread_exit;
121
122/* Global application Unix socket path */
123static char apps_unix_sock_path[PATH_MAX];
124/* Global client Unix socket path */
125static char client_unix_sock_path[PATH_MAX];
126/* global wait shm path for UST */
127static char wait_shm_path[PATH_MAX];
128
129/* Sockets and FDs */
130static int client_sock;
131static int apps_sock;
132static int kernel_tracer_fd;
133static int kernel_poll_pipe[2];
134
135/*
136 * Quit pipe for all threads. This permits a single cancellation point
137 * for all threads when receiving an event on the pipe.
138 */
139static int thread_quit_pipe[2];
140
141/*
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
144 */
145static int apps_cmd_pipe[2];
146
147/* Pthread, Mutexes and Semaphores */
148static pthread_t apps_thread;
149static pthread_t reg_apps_thread;
150static pthread_t client_thread;
151static pthread_t kernel_thread;
152static pthread_t dispatch_thread;
153
154
155/*
156 * UST registration command queue. This queue is tied with a futex and uses a N
157 * wakers / 1 waiter implemented and detailed in futex.c/.h
158 *
159 * The thread_manage_apps and thread_dispatch_ust_registration interact with
160 * this queue and the wait/wake scheme.
161 */
162static struct ust_cmd_queue ust_cmd_queue;
163
164/*
165 * Pointer initialized before thread creation.
166 *
167 * This points to the tracing session list containing the session count and a
168 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
169 * MUST NOT be taken if you call a public function in session.c.
170 *
171 * The lock is nested inside the structure: session_list_ptr->lock. Please use
172 * session_lock_list and session_unlock_list for lock acquisition.
173 */
174static struct ltt_session_list *session_list_ptr;
175
176int ust_consumerd64_fd = -1;
177int ust_consumerd32_fd = -1;
178
179static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
180static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
181static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
182static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
183
184static
185void setup_consumerd_path(void)
186{
187 const char *bin, *libdir;
188
189 /*
190 * Allow INSTALL_BIN_PATH to be used as a target path for the
191 * native architecture size consumer if CONFIG_CONSUMER*_PATH
192 * has not been defined.
193 */
194#if (CAA_BITS_PER_LONG == 32)
195 if (!consumerd32_bin[0]) {
196 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
197 }
198 if (!consumerd32_libdir[0]) {
199 consumerd32_libdir = INSTALL_LIB_PATH;
200 }
201#elif (CAA_BITS_PER_LONG == 64)
202 if (!consumerd64_bin[0]) {
203 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
204 }
205 if (!consumerd64_libdir[0]) {
206 consumerd64_libdir = INSTALL_LIB_PATH;
207 }
208#else
209#error "Unknown bitness"
210#endif
211
212 /*
213 * runtime env. var. overrides the build default.
214 */
215 bin = getenv("LTTNG_CONSUMERD32_BIN");
216 if (bin) {
217 consumerd32_bin = bin;
218 }
219 bin = getenv("LTTNG_CONSUMERD64_BIN");
220 if (bin) {
221 consumerd64_bin = bin;
222 }
223 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
224 if (libdir) {
225 consumerd32_libdir = libdir;
226 }
227 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
228 if (libdir) {
229 consumerd64_libdir = libdir;
230 }
231}
232
233/*
234 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
235 */
236static int create_thread_poll_set(struct lttng_poll_event *events,
237 unsigned int size)
238{
239 int ret;
240
241 if (events == NULL || size == 0) {
242 ret = -1;
243 goto error;
244 }
245
246 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
247 if (ret < 0) {
248 goto error;
249 }
250
251 /* Add quit pipe */
252 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
253 if (ret < 0) {
254 goto error;
255 }
256
257 return 0;
258
259error:
260 return ret;
261}
262
263/*
264 * Check if the thread quit pipe was triggered.
265 *
266 * Return 1 if it was triggered else 0;
267 */
268static int check_thread_quit_pipe(int fd, uint32_t events)
269{
270 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
271 return 1;
272 }
273
274 return 0;
275}
276
277/*
278 * Remove modules in reverse load order.
279 */
280static int modprobe_remove_kernel_modules(void)
281{
282 int ret = 0, i;
283 char modprobe[256];
284
285 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
286 ret = snprintf(modprobe, sizeof(modprobe),
287 "/sbin/modprobe -r -q %s",
288 kernel_modules_list[i].name);
289 if (ret < 0) {
290 perror("snprintf modprobe -r");
291 goto error;
292 }
293 modprobe[sizeof(modprobe) - 1] = '\0';
294 ret = system(modprobe);
295 if (ret == -1) {
296 ERR("Unable to launch modprobe -r for module %s",
297 kernel_modules_list[i].name);
298 } else if (kernel_modules_list[i].required
299 && WEXITSTATUS(ret) != 0) {
300 ERR("Unable to remove module %s",
301 kernel_modules_list[i].name);
302 } else {
303 DBG("Modprobe removal successful %s",
304 kernel_modules_list[i].name);
305 }
306 }
307
308error:
309 return ret;
310}
311
312/*
313 * Return group ID of the tracing group or -1 if not found.
314 */
315static gid_t allowed_group(void)
316{
317 struct group *grp;
318
319 if (opt_tracing_group) {
320 grp = getgrnam(opt_tracing_group);
321 } else {
322 grp = getgrnam(default_tracing_group);
323 }
324 if (!grp) {
325 return -1;
326 } else {
327 return grp->gr_gid;
328 }
329}
330
331/*
332 * Init thread quit pipe.
333 *
334 * Return -1 on error or 0 if all pipes are created.
335 */
336static int init_thread_quit_pipe(void)
337{
338 int ret;
339
340 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
341 if (ret < 0) {
342 perror("thread quit pipe");
343 goto error;
344 }
345
346error:
347 return ret;
348}
349
350/*
351 * Complete teardown of a kernel session. This free all data structure related
352 * to a kernel session and update counter.
353 */
354static void teardown_kernel_session(struct ltt_session *session)
355{
356 if (!session->kernel_session) {
357 DBG3("No kernel session when tearingdown session");
358 return;
359 }
360
361 DBG("Tearing down kernel session");
362
363 /*
364 * If a custom kernel consumer was registered, close the socket before
365 * tearing down the complete kernel session structure
366 */
367 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
368 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
369 }
370
371 trace_kernel_destroy_session(session->kernel_session);
372}
373
374/*
375 * Complete teardown of all UST sessions. This will free everything on his path
376 * and destroy the core essence of all ust sessions :)
377 */
378static void teardown_ust_session(struct ltt_session *session)
379{
380 int ret;
381
382 if (!session->ust_session) {
383 DBG3("No UST session when tearingdown session");
384 return;
385 }
386
387 DBG("Tearing down UST session(s)");
388
389 ret = ust_app_destroy_trace_all(session->ust_session);
390 if (ret) {
391 ERR("Error in ust_app_destroy_trace_all");
392 }
393
394 trace_ust_destroy_session(session->ust_session);
395}
396
397/*
398 * Stop all threads by closing the thread quit pipe.
399 */
400static void stop_threads(void)
401{
402 int ret;
403
404 /* Stopping all threads */
405 DBG("Terminating all threads");
406 ret = notify_thread_pipe(thread_quit_pipe[1]);
407 if (ret < 0) {
408 ERR("write error on thread quit pipe");
409 }
410
411 /* Dispatch thread */
412 dispatch_thread_exit = 1;
413 futex_nto1_wake(&ust_cmd_queue.futex);
414}
415
416/*
417 * Cleanup the daemon
418 */
419static void cleanup(void)
420{
421 int ret;
422 char *cmd;
423 struct ltt_session *sess, *stmp;
424
425 DBG("Cleaning up");
426
427 DBG("Removing %s directory", rundir);
428 ret = asprintf(&cmd, "rm -rf %s", 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 %s", rundir);
437 }
438 free(cmd);
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 if (is_root && !opt_no_kernel) {
461 DBG2("Closing kernel fd");
462 close(kernel_tracer_fd);
463 DBG("Unloading kernel modules");
464 modprobe_remove_kernel_modules();
465 }
466
467 close(thread_quit_pipe[0]);
468 close(thread_quit_pipe[1]);
469
470 /* OUTPUT BENCHMARK RESULTS */
471 bench_init();
472
473 if (getenv("BENCH_UST_NOTIFY")) {
474 bench_print_ust_notification();
475 }
476
477 if (getenv("BENCH_UST_REGISTER")) {
478 bench_print_ust_register();
479 bench_print_ust_unregister();
480 }
481
482 if (getenv("BENCH_BOOT_PROCESS")) {
483 bench_print_boot_process();
484 }
485
486 bench_close();
487 /* END BENCHMARK */
488
489 /* <fun> */
490 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
491 "Matthew, BEET driven development works!%c[%dm",
492 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
493 /* </fun> */
494}
495
496/*
497 * Send data on a unix socket using the liblttsessiondcomm API.
498 *
499 * Return lttcomm error code.
500 */
501static int send_unix_sock(int sock, void *buf, size_t len)
502{
503 /* Check valid length */
504 if (len <= 0) {
505 return -1;
506 }
507
508 return lttcomm_send_unix_sock(sock, buf, len);
509}
510
511/*
512 * Free memory of a command context structure.
513 */
514static void clean_command_ctx(struct command_ctx **cmd_ctx)
515{
516 DBG("Clean command context structure");
517 if (*cmd_ctx) {
518 if ((*cmd_ctx)->llm) {
519 free((*cmd_ctx)->llm);
520 }
521 if ((*cmd_ctx)->lsm) {
522 free((*cmd_ctx)->lsm);
523 }
524 free(*cmd_ctx);
525 *cmd_ctx = NULL;
526 }
527}
528
529/*
530 * Send all stream fds of kernel channel to the consumer.
531 */
532static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
533 int sock, struct ltt_kernel_channel *channel,
534 uid_t uid, gid_t gid)
535{
536 int ret;
537 struct ltt_kernel_stream *stream;
538 struct lttcomm_consumer_msg lkm;
539
540 DBG("Sending streams of channel %s to kernel consumer",
541 channel->channel->name);
542
543 /* Send channel */
544 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
545 lkm.u.channel.channel_key = channel->fd;
546 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
547 lkm.u.channel.mmap_len = 0; /* for kernel */
548 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
549 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
550 if (ret < 0) {
551 perror("send consumer channel");
552 goto error;
553 }
554
555 /* Send streams */
556 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
557 if (!stream->fd) {
558 continue;
559 }
560 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
561 lkm.u.stream.channel_key = channel->fd;
562 lkm.u.stream.stream_key = stream->fd;
563 lkm.u.stream.state = stream->state;
564 lkm.u.stream.output = channel->channel->attr.output;
565 lkm.u.stream.mmap_len = 0; /* for kernel */
566 lkm.u.stream.uid = uid;
567 lkm.u.stream.gid = gid;
568 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
569 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
570 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
571 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
572 if (ret < 0) {
573 perror("send consumer stream");
574 goto error;
575 }
576 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
577 if (ret < 0) {
578 perror("send consumer stream ancillary data");
579 goto error;
580 }
581 }
582
583 DBG("consumer channel streams sent");
584
585 return 0;
586
587error:
588 return ret;
589}
590
591/*
592 * Send all stream fds of the kernel session to the consumer.
593 */
594static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
595 struct ltt_kernel_session *session)
596{
597 int ret;
598 struct ltt_kernel_channel *chan;
599 struct lttcomm_consumer_msg lkm;
600 int sock = session->consumer_fd;
601
602 DBG("Sending metadata stream fd");
603
604 /* Extra protection. It's NOT supposed to be set to 0 at this point */
605 if (session->consumer_fd == 0) {
606 session->consumer_fd = consumer_data->cmd_sock;
607 }
608
609 if (session->metadata_stream_fd != 0) {
610 /* Send metadata channel fd */
611 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
612 lkm.u.channel.channel_key = session->metadata->fd;
613 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
614 lkm.u.channel.mmap_len = 0; /* for kernel */
615 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
616 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
617 if (ret < 0) {
618 perror("send consumer channel");
619 goto error;
620 }
621
622 /* Send metadata stream fd */
623 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
624 lkm.u.stream.channel_key = session->metadata->fd;
625 lkm.u.stream.stream_key = session->metadata_stream_fd;
626 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
627 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
628 lkm.u.stream.mmap_len = 0; /* for kernel */
629 lkm.u.stream.uid = session->uid;
630 lkm.u.stream.gid = session->gid;
631 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
632 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
633 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
634 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
635 if (ret < 0) {
636 perror("send consumer stream");
637 goto error;
638 }
639 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
640 if (ret < 0) {
641 perror("send consumer stream");
642 goto error;
643 }
644 }
645
646 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
647 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
648 session->uid, session->gid);
649 if (ret < 0) {
650 goto error;
651 }
652 }
653
654 DBG("consumer fds (metadata and channel streams) sent");
655
656 return 0;
657
658error:
659 return ret;
660}
661
662/*
663 * Notify UST applications using the shm mmap futex.
664 */
665static int notify_ust_apps(int active)
666{
667 char *wait_shm_mmap;
668
669 DBG("Notifying applications of session daemon state: %d", active);
670
671 tracepoint(ust_notify_apps_start);
672
673 /* See shm.c for this call implying mmap, shm and futex calls */
674 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
675 if (wait_shm_mmap == NULL) {
676 goto error;
677 }
678
679 /* Wake waiting process */
680 futex_wait_update((int32_t *) wait_shm_mmap, active);
681
682 tracepoint(ust_notify_apps_stop);
683
684 /* Apps notified successfully */
685 return 0;
686
687error:
688 return -1;
689}
690
691/*
692 * Setup the outgoing data buffer for the response (llm) by allocating the
693 * right amount of memory and copying the original information from the lsm
694 * structure.
695 *
696 * Return total size of the buffer pointed by buf.
697 */
698static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
699{
700 int ret, buf_size;
701
702 buf_size = size;
703
704 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
705 if (cmd_ctx->llm == NULL) {
706 perror("zmalloc");
707 ret = -ENOMEM;
708 goto error;
709 }
710
711 /* Copy common data */
712 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
713 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
714
715 cmd_ctx->llm->data_size = size;
716 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
717
718 return buf_size;
719
720error:
721 return ret;
722}
723
724/*
725 * Update the kernel poll set of all channel fd available over all tracing
726 * session. Add the wakeup pipe at the end of the set.
727 */
728static int update_kernel_poll(struct lttng_poll_event *events)
729{
730 int ret;
731 struct ltt_session *session;
732 struct ltt_kernel_channel *channel;
733
734 DBG("Updating kernel poll set");
735
736 session_lock_list();
737 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
738 session_lock(session);
739 if (session->kernel_session == NULL) {
740 session_unlock(session);
741 continue;
742 }
743
744 cds_list_for_each_entry(channel,
745 &session->kernel_session->channel_list.head, list) {
746 /* Add channel fd to the kernel poll set */
747 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
748 if (ret < 0) {
749 session_unlock(session);
750 goto error;
751 }
752 DBG("Channel fd %d added to kernel set", channel->fd);
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757
758 return 0;
759
760error:
761 session_unlock_list();
762 return -1;
763}
764
765/*
766 * Find the channel fd from 'fd' over all tracing session. When found, check
767 * for new channel stream and send those stream fds to the kernel consumer.
768 *
769 * Useful for CPU hotplug feature.
770 */
771static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
772{
773 int ret = 0;
774 struct ltt_session *session;
775 struct ltt_kernel_channel *channel;
776
777 DBG("Updating kernel streams for channel fd %d", fd);
778
779 session_lock_list();
780 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
781 session_lock(session);
782 if (session->kernel_session == NULL) {
783 session_unlock(session);
784 continue;
785 }
786
787 /* This is not suppose to be 0 but this is an extra security check */
788 if (session->kernel_session->consumer_fd == 0) {
789 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
790 }
791
792 cds_list_for_each_entry(channel,
793 &session->kernel_session->channel_list.head, list) {
794 if (channel->fd == fd) {
795 DBG("Channel found, updating kernel streams");
796 ret = kernel_open_channel_stream(channel);
797 if (ret < 0) {
798 goto error;
799 }
800
801 /*
802 * Have we already sent fds to the consumer? If yes, it means
803 * that tracing is started so it is safe to send our updated
804 * stream fds.
805 */
806 if (session->kernel_session->consumer_fds_sent == 1) {
807 ret = send_kconsumer_channel_streams(consumer_data,
808 session->kernel_session->consumer_fd, channel,
809 session->uid, session->gid);
810 if (ret < 0) {
811 goto error;
812 }
813 }
814 goto error;
815 }
816 }
817 session_unlock(session);
818 }
819 session_unlock_list();
820 return ret;
821
822error:
823 session_unlock(session);
824 session_unlock_list();
825 return ret;
826}
827
828/*
829 * For each tracing session, update newly registered apps.
830 */
831static void update_ust_app(int app_sock)
832{
833 struct ltt_session *sess, *stmp;
834
835 /* For all tracing session(s) */
836 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
837 if (sess->ust_session) {
838 ust_app_global_update(sess->ust_session, app_sock);
839 }
840 }
841}
842
843/*
844 * This thread manage event coming from the kernel.
845 *
846 * Features supported in this thread:
847 * -) CPU Hotplug
848 */
849static void *thread_manage_kernel(void *data)
850{
851 int ret, i, pollfd, update_poll_flag = 1;
852 uint32_t revents, nb_fd;
853 char tmp;
854 struct lttng_poll_event events;
855
856 tracepoint(sessiond_th_kern_start);
857
858 DBG("Thread manage kernel started");
859
860 ret = create_thread_poll_set(&events, 2);
861 if (ret < 0) {
862 goto error;
863 }
864
865 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
866 if (ret < 0) {
867 goto error;
868 }
869
870 while (1) {
871 if (update_poll_flag == 1) {
872 /*
873 * Reset number of fd in the poll set. Always 2 since there is the thread
874 * quit pipe and the kernel pipe.
875 */
876 events.nb_fd = 2;
877
878 ret = update_kernel_poll(&events);
879 if (ret < 0) {
880 goto error;
881 }
882 update_poll_flag = 0;
883 }
884
885 nb_fd = LTTNG_POLL_GETNB(&events);
886
887 DBG("Thread kernel polling on %d fds", nb_fd);
888
889 /* Zeroed the poll events */
890 lttng_poll_reset(&events);
891
892 tracepoint(sessiond_th_kern_poll);
893
894 /* Poll infinite value of time */
895 ret = lttng_poll_wait(&events, -1);
896 if (ret < 0) {
897 goto error;
898 } else if (ret == 0) {
899 /* Should not happen since timeout is infinite */
900 ERR("Return value of poll is 0 with an infinite timeout.\n"
901 "This should not have happened! Continuing...");
902 continue;
903 }
904
905 for (i = 0; i < nb_fd; i++) {
906 /* Fetch once the poll data */
907 revents = LTTNG_POLL_GETEV(&events, i);
908 pollfd = LTTNG_POLL_GETFD(&events, i);
909
910 /* Thread quit pipe has been closed. Killing thread. */
911 ret = check_thread_quit_pipe(pollfd, revents);
912 if (ret) {
913 goto error;
914 }
915
916 /* Check for data on kernel pipe */
917 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
918 ret = read(kernel_poll_pipe[0], &tmp, 1);
919 update_poll_flag = 1;
920 continue;
921 } else {
922 /*
923 * New CPU detected by the kernel. Adding kernel stream to
924 * kernel session and updating the kernel consumer
925 */
926 if (revents & LPOLLIN) {
927 ret = update_kernel_stream(&kconsumer_data, pollfd);
928 if (ret < 0) {
929 continue;
930 }
931 break;
932 /*
933 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
934 * and unregister kernel stream at this point.
935 */
936 }
937 }
938 }
939 }
940
941error:
942 DBG("Kernel thread dying");
943 close(kernel_poll_pipe[0]);
944 close(kernel_poll_pipe[1]);
945
946 lttng_poll_clean(&events);
947
948 return NULL;
949}
950
951/*
952 * This thread manage the consumer error sent back to the session daemon.
953 */
954static void *thread_manage_consumer(void *data)
955{
956 int sock = 0, i, ret, pollfd;
957 uint32_t revents, nb_fd;
958 enum lttcomm_return_code code;
959 struct lttng_poll_event events;
960 struct consumer_data *consumer_data = data;
961
962 tracepoint(sessiond_th_kcon_start);
963
964 DBG("[thread] Manage consumer started");
965
966 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
967 if (ret < 0) {
968 goto error;
969 }
970
971 /*
972 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
973 * Nothing more will be added to this poll set.
974 */
975 ret = create_thread_poll_set(&events, 2);
976 if (ret < 0) {
977 goto error;
978 }
979
980 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
981 if (ret < 0) {
982 goto error;
983 }
984
985 nb_fd = LTTNG_POLL_GETNB(&events);
986
987 tracepoint(sessiond_th_kcon_poll);
988
989 /* Inifinite blocking call, waiting for transmission */
990 ret = lttng_poll_wait(&events, -1);
991 if (ret < 0) {
992 goto error;
993 }
994
995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the registration socket */
1007 if (pollfd == consumer_data->err_sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1009 ERR("consumer err socket poll error");
1010 goto error;
1011 }
1012 }
1013 }
1014
1015 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1016 if (sock < 0) {
1017 goto error;
1018 }
1019
1020 DBG2("Receiving code from consumer err_sock");
1021
1022 /* Getting status code from kconsumerd */
1023 ret = lttcomm_recv_unix_sock(sock, &code,
1024 sizeof(enum lttcomm_return_code));
1025 if (ret <= 0) {
1026 goto error;
1027 }
1028
1029 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1030 consumer_data->cmd_sock =
1031 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1032 if (consumer_data->cmd_sock < 0) {
1033 sem_post(&consumer_data->sem);
1034 PERROR("consumer connect");
1035 goto error;
1036 }
1037 /* Signal condition to tell that the kconsumerd is ready */
1038 sem_post(&consumer_data->sem);
1039 DBG("consumer command socket ready");
1040 } else {
1041 ERR("consumer error when waiting for SOCK_READY : %s",
1042 lttcomm_get_readable_code(-code));
1043 goto error;
1044 }
1045
1046 /* Remove the kconsumerd error sock since we've established a connexion */
1047 ret = lttng_poll_del(&events, consumer_data->err_sock);
1048 if (ret < 0) {
1049 goto error;
1050 }
1051
1052 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1053 if (ret < 0) {
1054 goto error;
1055 }
1056
1057 /* Update number of fd */
1058 nb_fd = LTTNG_POLL_GETNB(&events);
1059
1060 /* Inifinite blocking call, waiting for transmission */
1061 ret = lttng_poll_wait(&events, -1);
1062 if (ret < 0) {
1063 goto error;
1064 }
1065
1066 for (i = 0; i < nb_fd; i++) {
1067 /* Fetch once the poll data */
1068 revents = LTTNG_POLL_GETEV(&events, i);
1069 pollfd = LTTNG_POLL_GETFD(&events, i);
1070
1071 /* Thread quit pipe has been closed. Killing thread. */
1072 ret = check_thread_quit_pipe(pollfd, revents);
1073 if (ret) {
1074 goto error;
1075 }
1076
1077 /* Event on the kconsumerd socket */
1078 if (pollfd == sock) {
1079 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1080 ERR("consumer err socket second poll error");
1081 goto error;
1082 }
1083 }
1084 }
1085
1086 /* Wait for any kconsumerd error */
1087 ret = lttcomm_recv_unix_sock(sock, &code,
1088 sizeof(enum lttcomm_return_code));
1089 if (ret <= 0) {
1090 ERR("consumer closed the command socket");
1091 goto error;
1092 }
1093
1094 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1095
1096error:
1097 DBG("consumer thread dying");
1098 close(consumer_data->err_sock);
1099 close(consumer_data->cmd_sock);
1100 close(sock);
1101
1102 unlink(consumer_data->err_unix_sock_path);
1103 unlink(consumer_data->cmd_unix_sock_path);
1104 consumer_data->pid = 0;
1105
1106 lttng_poll_clean(&events);
1107
1108 return NULL;
1109}
1110
1111/*
1112 * This thread manage application communication.
1113 */
1114static void *thread_manage_apps(void *data)
1115{
1116 int i, ret, pollfd;
1117 uint32_t revents, nb_fd;
1118 struct ust_command ust_cmd;
1119 struct lttng_poll_event events;
1120
1121 tracepoint(sessiond_th_apps_start);
1122
1123 DBG("[thread] Manage application started");
1124
1125 rcu_register_thread();
1126 rcu_thread_online();
1127
1128 ret = create_thread_poll_set(&events, 2);
1129 if (ret < 0) {
1130 goto error;
1131 }
1132
1133 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1134 if (ret < 0) {
1135 goto error;
1136 }
1137
1138 while (1) {
1139 /* Zeroed the events structure */
1140 lttng_poll_reset(&events);
1141
1142 nb_fd = LTTNG_POLL_GETNB(&events);
1143
1144 DBG("Apps thread polling on %d fds", nb_fd);
1145
1146 tracepoint(sessiond_th_apps_poll);
1147
1148 /* Inifinite blocking call, waiting for transmission */
1149 ret = lttng_poll_wait(&events, -1);
1150 if (ret < 0) {
1151 goto error;
1152 }
1153
1154 for (i = 0; i < nb_fd; i++) {
1155 /* Fetch once the poll data */
1156 revents = LTTNG_POLL_GETEV(&events, i);
1157 pollfd = LTTNG_POLL_GETFD(&events, i);
1158
1159 /* Thread quit pipe has been closed. Killing thread. */
1160 ret = check_thread_quit_pipe(pollfd, revents);
1161 if (ret) {
1162 goto error;
1163 }
1164
1165 /* Inspect the apps cmd pipe */
1166 if (pollfd == apps_cmd_pipe[0]) {
1167 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1168 ERR("Apps command pipe error");
1169 goto error;
1170 } else if (revents & LPOLLIN) {
1171 tracepoint(ust_register_read_start);
1172 /* Empty pipe */
1173 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1174 if (ret < 0 || ret < sizeof(ust_cmd)) {
1175 perror("read apps cmd pipe");
1176 goto error;
1177 }
1178 tracepoint(ust_register_read_stop);
1179
1180 tracepoint(ust_register_add_start);
1181 /* Register applicaton to the session daemon */
1182 ret = ust_app_register(&ust_cmd.reg_msg,
1183 ust_cmd.sock);
1184 if (ret == -ENOMEM) {
1185 goto error;
1186 } else if (ret < 0) {
1187 break;
1188 }
1189 tracepoint(ust_register_add_stop);
1190
1191 tracepoint(ust_register_done_start);
1192 /*
1193 * Add channel(s) and event(s) to newly registered apps
1194 * from lttng global UST domain.
1195 */
1196 update_ust_app(ust_cmd.sock);
1197
1198 ret = ust_app_register_done(ust_cmd.sock);
1199 if (ret < 0) {
1200 /*
1201 * If the registration is not possible, we simply
1202 * unregister the apps and continue
1203 */
1204 ust_app_unregister(ust_cmd.sock);
1205 } else {
1206 /*
1207 * We just need here to monitor the close of the UST
1208 * socket and poll set monitor those by default.
1209 */
1210 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1211 if (ret < 0) {
1212 goto error;
1213 }
1214
1215 DBG("Apps with sock %d added to poll set",
1216 ust_cmd.sock);
1217 }
1218 tracepoint(ust_register_done_stop);
1219 break;
1220 }
1221 } else {
1222 /*
1223 * At this point, we know that a registered application made
1224 * the event at poll_wait.
1225 */
1226 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1227 tracepoint(ust_unregister_start);
1228
1229 /* Removing from the poll set */
1230 ret = lttng_poll_del(&events, pollfd);
1231 if (ret < 0) {
1232 goto error;
1233 }
1234
1235 /* Socket closed on remote end. */
1236 ust_app_unregister(pollfd);
1237
1238 tracepoint(ust_unregister_stop);
1239 break;
1240 }
1241 }
1242 }
1243 }
1244
1245error:
1246 DBG("Application communication apps dying");
1247 close(apps_cmd_pipe[0]);
1248 close(apps_cmd_pipe[1]);
1249
1250 lttng_poll_clean(&events);
1251
1252 rcu_thread_offline();
1253 rcu_unregister_thread();
1254 return NULL;
1255}
1256
1257/*
1258 * Dispatch request from the registration threads to the application
1259 * communication thread.
1260 */
1261static void *thread_dispatch_ust_registration(void *data)
1262{
1263 int ret;
1264 struct cds_wfq_node *node;
1265 struct ust_command *ust_cmd = NULL;
1266
1267 tracepoint(sessiond_th_dispatch_start);
1268
1269 DBG("[thread] Dispatch UST command started");
1270
1271 while (!dispatch_thread_exit) {
1272 /* Atomically prepare the queue futex */
1273 futex_nto1_prepare(&ust_cmd_queue.futex);
1274
1275 do {
1276 tracepoint(sessiond_th_dispatch_block);
1277
1278 /* Dequeue command for registration */
1279 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1280 if (node == NULL) {
1281 DBG("Woken up but nothing in the UST command queue");
1282 /* Continue thread execution */
1283 break;
1284 }
1285
1286 tracepoint(ust_dispatch_register_start);
1287
1288 ust_cmd = caa_container_of(node, struct ust_command, node);
1289
1290 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1291 " gid:%d sock:%d name:%s (version %d.%d)",
1292 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1293 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1294 ust_cmd->sock, ust_cmd->reg_msg.name,
1295 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1296 /*
1297 * Inform apps thread of the new application registration. This
1298 * call is blocking so we can be assured that the data will be read
1299 * at some point in time or wait to the end of the world :)
1300 */
1301 ret = write(apps_cmd_pipe[1], ust_cmd,
1302 sizeof(struct ust_command));
1303 if (ret < 0) {
1304 perror("write apps cmd pipe");
1305 if (errno == EBADF) {
1306 /*
1307 * We can't inform the application thread to process
1308 * registration. We will exit or else application
1309 * registration will not occur and tracing will never
1310 * start.
1311 */
1312 goto error;
1313 }
1314 }
1315 free(ust_cmd);
1316 } while (node != NULL);
1317
1318 tracepoint(ust_dispatch_register_stop);
1319
1320 /* Futex wait on queue. Blocking call on futex() */
1321 futex_nto1_wait(&ust_cmd_queue.futex);
1322 }
1323
1324error:
1325 DBG("Dispatch thread dying");
1326 return NULL;
1327}
1328
1329/*
1330 * This thread manage application registration.
1331 */
1332static void *thread_registration_apps(void *data)
1333{
1334 int sock = 0, i, ret, pollfd;
1335 uint32_t revents, nb_fd;
1336 struct lttng_poll_event events;
1337 /*
1338 * Get allocated in this thread, enqueued to a global queue, dequeued and
1339 * freed in the manage apps thread.
1340 */
1341 struct ust_command *ust_cmd = NULL;
1342
1343 tracepoint(sessiond_th_reg_start);
1344
1345 DBG("[thread] Manage application registration started");
1346
1347 ret = lttcomm_listen_unix_sock(apps_sock);
1348 if (ret < 0) {
1349 goto error;
1350 }
1351
1352 /*
1353 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1354 * more will be added to this poll set.
1355 */
1356 ret = create_thread_poll_set(&events, 2);
1357 if (ret < 0) {
1358 goto error;
1359 }
1360
1361 /* Add the application registration socket */
1362 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1363 if (ret < 0) {
1364 goto error;
1365 }
1366
1367 /* Notify all applications to register */
1368 ret = notify_ust_apps(1);
1369 if (ret < 0) {
1370 ERR("Failed to notify applications or create the wait shared memory.\n"
1371 "Execution continues but there might be problem for already\n"
1372 "running applications that wishes to register.");
1373 }
1374
1375 while (1) {
1376 DBG("Accepting application registration");
1377
1378 tracepoint(sessiond_th_reg_poll);
1379
1380 nb_fd = LTTNG_POLL_GETNB(&events);
1381
1382 /* Inifinite blocking call, waiting for transmission */
1383 ret = lttng_poll_wait(&events, -1);
1384 if (ret < 0) {
1385 goto error;
1386 }
1387
1388 for (i = 0; i < nb_fd; i++) {
1389 /* Fetch once the poll data */
1390 revents = LTTNG_POLL_GETEV(&events, i);
1391 pollfd = LTTNG_POLL_GETFD(&events, i);
1392
1393 /* Thread quit pipe has been closed. Killing thread. */
1394 ret = check_thread_quit_pipe(pollfd, revents);
1395 if (ret) {
1396 goto error;
1397 }
1398
1399 /* Event on the registration socket */
1400 if (pollfd == apps_sock) {
1401 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1402 ERR("Register apps socket poll error");
1403 goto error;
1404 } else if (revents & LPOLLIN) {
1405 /* Registration starts here. Recording cycles */
1406 tracepoint(ust_register_start);
1407
1408 sock = lttcomm_accept_unix_sock(apps_sock);
1409 if (sock < 0) {
1410 goto error;
1411 }
1412
1413 /* Create UST registration command for enqueuing */
1414 ust_cmd = zmalloc(sizeof(struct ust_command));
1415 if (ust_cmd == NULL) {
1416 perror("ust command zmalloc");
1417 goto error;
1418 }
1419
1420 /*
1421 * Using message-based transmissions to ensure we don't
1422 * have to deal with partially received messages.
1423 */
1424 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1425 sizeof(struct ust_register_msg));
1426 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1427 if (ret < 0) {
1428 perror("lttcomm_recv_unix_sock register apps");
1429 } else {
1430 ERR("Wrong size received on apps register");
1431 }
1432 free(ust_cmd);
1433 close(sock);
1434 continue;
1435 }
1436
1437 ust_cmd->sock = sock;
1438
1439 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1440 " gid:%d sock:%d name:%s (version %d.%d)",
1441 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1442 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1443 ust_cmd->sock, ust_cmd->reg_msg.name,
1444 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1445
1446 /*
1447 * Lock free enqueue the registration request. The red pill
1448 * has been taken! This apps will be part of the *system*.
1449 */
1450 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1451
1452 /*
1453 * Wake the registration queue futex. Implicit memory
1454 * barrier with the exchange in cds_wfq_enqueue.
1455 */
1456 futex_nto1_wake(&ust_cmd_queue.futex);
1457
1458 tracepoint(ust_register_stop);
1459 }
1460 }
1461 }
1462 }
1463
1464error:
1465 DBG("UST Registration thread dying");
1466
1467 /* Notify that the registration thread is gone */
1468 notify_ust_apps(0);
1469
1470 close(apps_sock);
1471 close(sock);
1472 unlink(apps_unix_sock_path);
1473
1474 lttng_poll_clean(&events);
1475
1476 return NULL;
1477}
1478
1479/*
1480 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1481 * exec or it will fails.
1482 */
1483static int spawn_consumer_thread(struct consumer_data *consumer_data)
1484{
1485 int ret;
1486 struct timespec timeout;
1487
1488 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1489 timeout.tv_nsec = 0;
1490
1491 /* Setup semaphore */
1492 ret = sem_init(&consumer_data->sem, 0, 0);
1493 if (ret < 0) {
1494 PERROR("sem_init consumer semaphore");
1495 goto error;
1496 }
1497
1498 ret = pthread_create(&consumer_data->thread, NULL,
1499 thread_manage_consumer, consumer_data);
1500 if (ret != 0) {
1501 PERROR("pthread_create consumer");
1502 ret = -1;
1503 goto error;
1504 }
1505
1506 /* Get time for sem_timedwait absolute timeout */
1507 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1508 if (ret < 0) {
1509 PERROR("clock_gettime spawn consumer");
1510 /* Infinite wait for the kconsumerd thread to be ready */
1511 ret = sem_wait(&consumer_data->sem);
1512 } else {
1513 /* Normal timeout if the gettime was successful */
1514 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1515 ret = sem_timedwait(&consumer_data->sem, &timeout);
1516 }
1517
1518 if (ret < 0) {
1519 if (errno == ETIMEDOUT) {
1520 /*
1521 * Call has timed out so we kill the kconsumerd_thread and return
1522 * an error.
1523 */
1524 ERR("The consumer thread was never ready. Killing it");
1525 ret = pthread_cancel(consumer_data->thread);
1526 if (ret < 0) {
1527 PERROR("pthread_cancel consumer thread");
1528 }
1529 } else {
1530 PERROR("semaphore wait failed consumer thread");
1531 }
1532 goto error;
1533 }
1534
1535 pthread_mutex_lock(&consumer_data->pid_mutex);
1536 if (consumer_data->pid == 0) {
1537 ERR("Kconsumerd did not start");
1538 pthread_mutex_unlock(&consumer_data->pid_mutex);
1539 goto error;
1540 }
1541 pthread_mutex_unlock(&consumer_data->pid_mutex);
1542
1543 return 0;
1544
1545error:
1546 return ret;
1547}
1548
1549/*
1550 * Join consumer thread
1551 */
1552static int join_consumer_thread(struct consumer_data *consumer_data)
1553{
1554 void *status;
1555 int ret;
1556
1557 if (consumer_data->pid != 0) {
1558 ret = kill(consumer_data->pid, SIGTERM);
1559 if (ret) {
1560 ERR("Error killing consumer daemon");
1561 return ret;
1562 }
1563 return pthread_join(consumer_data->thread, &status);
1564 } else {
1565 return 0;
1566 }
1567}
1568
1569/*
1570 * Fork and exec a consumer daemon (consumerd).
1571 *
1572 * Return pid if successful else -1.
1573 */
1574static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1575{
1576 int ret;
1577 pid_t pid;
1578 const char *consumer_to_use;
1579 const char *verbosity;
1580 struct stat st;
1581
1582 DBG("Spawning consumerd");
1583
1584 pid = fork();
1585 if (pid == 0) {
1586 /*
1587 * Exec consumerd.
1588 */
1589 if (opt_verbose_consumer) {
1590 verbosity = "--verbose";
1591 } else {
1592 verbosity = "--quiet";
1593 }
1594 switch (consumer_data->type) {
1595 case LTTNG_CONSUMER_KERNEL:
1596 /*
1597 * Find out which consumerd to execute. We will
1598 * first try the 64-bit path, then the
1599 * sessiond's installation directory, and
1600 * fallback on the 32-bit one,
1601 */
1602 DBG3("Looking for a kernel consumer at these locations:");
1603 DBG3(" 1) %s", consumerd64_bin);
1604 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1605 DBG3(" 3) %s", consumerd32_bin);
1606 if (stat(consumerd64_bin, &st) == 0) {
1607 DBG3("Found location #1");
1608 consumer_to_use = consumerd64_bin;
1609 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1610 DBG3("Found location #2");
1611 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1612 } else if (stat(consumerd32_bin, &st) == 0) {
1613 DBG3("Found location #3");
1614 consumer_to_use = consumerd32_bin;
1615 } else {
1616 DBG("Could not find any valid consumerd executable");
1617 break;
1618 }
1619 DBG("Using kernel consumer at: %s", consumer_to_use);
1620 execl(consumer_to_use,
1621 "lttng-consumerd", verbosity, "-k",
1622 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1623 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1624 NULL);
1625 break;
1626 case LTTNG_CONSUMER64_UST:
1627 {
1628 char *tmpnew = NULL;
1629
1630 if (consumerd64_libdir[0] != '\0') {
1631 char *tmp;
1632 size_t tmplen;
1633
1634 tmp = getenv("LD_LIBRARY_PATH");
1635 if (!tmp) {
1636 tmp = "";
1637 }
1638 tmplen = strlen("LD_LIBRARY_PATH=")
1639 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1640 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1641 if (!tmpnew) {
1642 ret = -ENOMEM;
1643 goto error;
1644 }
1645 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1646 strcat(tmpnew, consumerd64_libdir);
1647 if (tmp[0] != '\0') {
1648 strcat(tmpnew, ":");
1649 strcat(tmpnew, tmp);
1650 }
1651 ret = putenv(tmpnew);
1652 if (ret) {
1653 ret = -errno;
1654 goto error;
1655 }
1656 }
1657 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1658 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1659 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1660 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1661 NULL);
1662 if (consumerd64_libdir[0] != '\0') {
1663 free(tmpnew);
1664 }
1665 if (ret) {
1666 goto error;
1667 }
1668 break;
1669 }
1670 case LTTNG_CONSUMER32_UST:
1671 {
1672 char *tmpnew = NULL;
1673
1674 if (consumerd32_libdir[0] != '\0') {
1675 char *tmp;
1676 size_t tmplen;
1677
1678 tmp = getenv("LD_LIBRARY_PATH");
1679 if (!tmp) {
1680 tmp = "";
1681 }
1682 tmplen = strlen("LD_LIBRARY_PATH=")
1683 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1684 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1685 if (!tmpnew) {
1686 ret = -ENOMEM;
1687 goto error;
1688 }
1689 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1690 strcat(tmpnew, consumerd32_libdir);
1691 if (tmp[0] != '\0') {
1692 strcat(tmpnew, ":");
1693 strcat(tmpnew, tmp);
1694 }
1695 ret = putenv(tmpnew);
1696 if (ret) {
1697 ret = -errno;
1698 goto error;
1699 }
1700 }
1701 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1702 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1703 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1704 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1705 NULL);
1706 if (consumerd32_libdir[0] != '\0') {
1707 free(tmpnew);
1708 }
1709 if (ret) {
1710 goto error;
1711 }
1712 break;
1713 }
1714 default:
1715 perror("unknown consumer type");
1716 exit(EXIT_FAILURE);
1717 }
1718 if (errno != 0) {
1719 perror("kernel start consumer exec");
1720 }
1721 exit(EXIT_FAILURE);
1722 } else if (pid > 0) {
1723 ret = pid;
1724 } else {
1725 perror("start consumer fork");
1726 ret = -errno;
1727 }
1728error:
1729 return ret;
1730}
1731
1732/*
1733 * Spawn the consumerd daemon and session daemon thread.
1734 */
1735static int start_consumerd(struct consumer_data *consumer_data)
1736{
1737 int ret;
1738
1739 pthread_mutex_lock(&consumer_data->pid_mutex);
1740 if (consumer_data->pid != 0) {
1741 pthread_mutex_unlock(&consumer_data->pid_mutex);
1742 goto end;
1743 }
1744
1745 ret = spawn_consumerd(consumer_data);
1746 if (ret < 0) {
1747 ERR("Spawning consumerd failed");
1748 pthread_mutex_unlock(&consumer_data->pid_mutex);
1749 goto error;
1750 }
1751
1752 /* Setting up the consumer_data pid */
1753 consumer_data->pid = ret;
1754 DBG2("Consumer pid %d", consumer_data->pid);
1755 pthread_mutex_unlock(&consumer_data->pid_mutex);
1756
1757 DBG2("Spawning consumer control thread");
1758 ret = spawn_consumer_thread(consumer_data);
1759 if (ret < 0) {
1760 ERR("Fatal error spawning consumer control thread");
1761 goto error;
1762 }
1763
1764end:
1765 return 0;
1766
1767error:
1768 return ret;
1769}
1770
1771/*
1772 * modprobe_kernel_modules
1773 */
1774static int modprobe_kernel_modules(void)
1775{
1776 int ret = 0, i;
1777 char modprobe[256];
1778
1779 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1780 ret = snprintf(modprobe, sizeof(modprobe),
1781 "/sbin/modprobe %s%s",
1782 kernel_modules_list[i].required ? "" : "-q ",
1783 kernel_modules_list[i].name);
1784 if (ret < 0) {
1785 perror("snprintf modprobe");
1786 goto error;
1787 }
1788 modprobe[sizeof(modprobe) - 1] = '\0';
1789 ret = system(modprobe);
1790 if (ret == -1) {
1791 ERR("Unable to launch modprobe for module %s",
1792 kernel_modules_list[i].name);
1793 } else if (kernel_modules_list[i].required
1794 && WEXITSTATUS(ret) != 0) {
1795 ERR("Unable to load module %s",
1796 kernel_modules_list[i].name);
1797 } else {
1798 DBG("Modprobe successfully %s",
1799 kernel_modules_list[i].name);
1800 }
1801 }
1802
1803error:
1804 return ret;
1805}
1806
1807/*
1808 * mount_debugfs
1809 */
1810static int mount_debugfs(char *path)
1811{
1812 int ret;
1813 char *type = "debugfs";
1814
1815 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1816 if (ret < 0) {
1817 PERROR("Cannot create debugfs path");
1818 goto error;
1819 }
1820
1821 ret = mount(type, path, type, 0, NULL);
1822 if (ret < 0) {
1823 PERROR("Cannot mount debugfs");
1824 goto error;
1825 }
1826
1827 DBG("Mounted debugfs successfully at %s", path);
1828
1829error:
1830 return ret;
1831}
1832
1833/*
1834 * Setup necessary data for kernel tracer action.
1835 */
1836static void init_kernel_tracer(void)
1837{
1838 int ret;
1839 char *proc_mounts = "/proc/mounts";
1840 char line[256];
1841 char *debugfs_path = NULL, *lttng_path = NULL;
1842 FILE *fp;
1843
1844 /* Detect debugfs */
1845 fp = fopen(proc_mounts, "r");
1846 if (fp == NULL) {
1847 ERR("Unable to probe %s", proc_mounts);
1848 goto error;
1849 }
1850
1851 while (fgets(line, sizeof(line), fp) != NULL) {
1852 if (strstr(line, "debugfs") != NULL) {
1853 /* Remove first string */
1854 strtok(line, " ");
1855 /* Dup string here so we can reuse line later on */
1856 debugfs_path = strdup(strtok(NULL, " "));
1857 DBG("Got debugfs path : %s", debugfs_path);
1858 break;
1859 }
1860 }
1861
1862 fclose(fp);
1863
1864 /* Mount debugfs if needded */
1865 if (debugfs_path == NULL) {
1866 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1867 if (ret < 0) {
1868 perror("asprintf debugfs path");
1869 goto error;
1870 }
1871 ret = mount_debugfs(debugfs_path);
1872 if (ret < 0) {
1873 perror("Cannot mount debugfs");
1874 goto error;
1875 }
1876 }
1877
1878 /* Modprobe lttng kernel modules */
1879 ret = modprobe_kernel_modules();
1880 if (ret < 0) {
1881 goto error;
1882 }
1883
1884 /* Setup lttng kernel path */
1885 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1886 if (ret < 0) {
1887 perror("asprintf lttng path");
1888 goto error;
1889 }
1890
1891 /* Open debugfs lttng */
1892 kernel_tracer_fd = open(lttng_path, O_RDWR);
1893 if (kernel_tracer_fd < 0) {
1894 DBG("Failed to open %s", lttng_path);
1895 goto error;
1896 }
1897
1898 free(lttng_path);
1899 free(debugfs_path);
1900 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1901 return;
1902
1903error:
1904 if (lttng_path) {
1905 free(lttng_path);
1906 }
1907 if (debugfs_path) {
1908 free(debugfs_path);
1909 }
1910 WARN("No kernel tracer available");
1911 kernel_tracer_fd = 0;
1912 return;
1913}
1914
1915/*
1916 * Init tracing by creating trace directory and sending fds kernel consumer.
1917 */
1918static int init_kernel_tracing(struct ltt_kernel_session *session)
1919{
1920 int ret = 0;
1921
1922 if (session->consumer_fds_sent == 0) {
1923 /*
1924 * Assign default kernel consumer socket if no consumer assigned to the
1925 * kernel session. At this point, it's NOT suppose to be 0 but this is
1926 * an extra security check.
1927 */
1928 if (session->consumer_fd == 0) {
1929 session->consumer_fd = kconsumer_data.cmd_sock;
1930 }
1931
1932 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1933 if (ret < 0) {
1934 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1935 goto error;
1936 }
1937
1938 session->consumer_fds_sent = 1;
1939 }
1940
1941error:
1942 return ret;
1943}
1944
1945/*
1946 * Create an UST session and add it to the session ust list.
1947 */
1948static int create_ust_session(struct ltt_session *session,
1949 struct lttng_domain *domain)
1950{
1951 struct ltt_ust_session *lus = NULL;
1952 int ret;
1953
1954 switch (domain->type) {
1955 case LTTNG_DOMAIN_UST:
1956 break;
1957 default:
1958 ret = LTTCOMM_UNKNOWN_DOMAIN;
1959 goto error;
1960 }
1961
1962 DBG("Creating UST session");
1963
1964 lus = trace_ust_create_session(session->path, session->id, domain);
1965 if (lus == NULL) {
1966 ret = LTTCOMM_UST_SESS_FAIL;
1967 goto error;
1968 }
1969
1970 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
1971 session->uid, session->gid);
1972 if (ret < 0) {
1973 if (ret != -EEXIST) {
1974 ERR("Trace directory creation error");
1975 ret = LTTCOMM_UST_SESS_FAIL;
1976 goto error;
1977 }
1978 }
1979
1980 /* The domain type dictate different actions on session creation */
1981 switch (domain->type) {
1982 case LTTNG_DOMAIN_UST:
1983 /* No ustctl for the global UST domain */
1984 break;
1985 default:
1986 ERR("Unknown UST domain on create session %d", domain->type);
1987 goto error;
1988 }
1989 lus->uid = session->uid;
1990 lus->gid = session->gid;
1991 session->ust_session = lus;
1992
1993 return LTTCOMM_OK;
1994
1995error:
1996 free(lus);
1997 return ret;
1998}
1999
2000/*
2001 * Create a kernel tracer session then create the default channel.
2002 */
2003static int create_kernel_session(struct ltt_session *session)
2004{
2005 int ret;
2006
2007 DBG("Creating kernel session");
2008
2009 ret = kernel_create_session(session, kernel_tracer_fd);
2010 if (ret < 0) {
2011 ret = LTTCOMM_KERN_SESS_FAIL;
2012 goto error;
2013 }
2014
2015 /* Set kernel consumer socket fd */
2016 if (kconsumer_data.cmd_sock) {
2017 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
2018 }
2019
2020 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
2021 S_IRWXU | S_IRWXG, session->uid, session->gid);
2022 if (ret < 0) {
2023 if (ret != -EEXIST) {
2024 ERR("Trace directory creation error");
2025 goto error;
2026 }
2027 }
2028 session->kernel_session->uid = session->uid;
2029 session->kernel_session->gid = session->gid;
2030
2031error:
2032 return ret;
2033}
2034
2035/*
2036 * Check if the UID or GID match the session. Root user has access to
2037 * all sessions.
2038 */
2039static int session_access_ok(struct ltt_session *session,
2040 uid_t uid, gid_t gid)
2041{
2042 if (uid != session->uid && gid != session->gid
2043 && uid != 0) {
2044 return 0;
2045 } else {
2046 return 1;
2047 }
2048}
2049
2050static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2051{
2052 unsigned int i = 0;
2053 struct ltt_session *session;
2054
2055 DBG("Counting number of available session for UID %d GID %d",
2056 uid, gid);
2057 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2058 /*
2059 * Only list the sessions the user can control.
2060 */
2061 if (!session_access_ok(session, uid, gid)) {
2062 continue;
2063 }
2064 i++;
2065 }
2066 return i;
2067}
2068
2069/*
2070 * Using the session list, filled a lttng_session array to send back to the
2071 * client for session listing.
2072 *
2073 * The session list lock MUST be acquired before calling this function. Use
2074 * session_lock_list() and session_unlock_list().
2075 */
2076static void list_lttng_sessions(struct lttng_session *sessions,
2077 uid_t uid, gid_t gid)
2078{
2079 unsigned int i = 0;
2080 struct ltt_session *session;
2081
2082 DBG("Getting all available session for UID %d GID %d",
2083 uid, gid);
2084 /*
2085 * Iterate over session list and append data after the control struct in
2086 * the buffer.
2087 */
2088 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2089 /*
2090 * Only list the sessions the user can control.
2091 */
2092 if (!session_access_ok(session, uid, gid)) {
2093 continue;
2094 }
2095 strncpy(sessions[i].path, session->path, PATH_MAX);
2096 sessions[i].path[PATH_MAX - 1] = '\0';
2097 strncpy(sessions[i].name, session->name, NAME_MAX);
2098 sessions[i].name[NAME_MAX - 1] = '\0';
2099 sessions[i].enabled = session->enabled;
2100 i++;
2101 }
2102}
2103
2104/*
2105 * Fill lttng_channel array of all channels.
2106 */
2107static void list_lttng_channels(int domain, struct ltt_session *session,
2108 struct lttng_channel *channels)
2109{
2110 int i = 0;
2111 struct ltt_kernel_channel *kchan;
2112
2113 DBG("Listing channels for session %s", session->name);
2114
2115 switch (domain) {
2116 case LTTNG_DOMAIN_KERNEL:
2117 /* Kernel channels */
2118 if (session->kernel_session != NULL) {
2119 cds_list_for_each_entry(kchan,
2120 &session->kernel_session->channel_list.head, list) {
2121 /* Copy lttng_channel struct to array */
2122 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2123 channels[i].enabled = kchan->enabled;
2124 i++;
2125 }
2126 }
2127 break;
2128 case LTTNG_DOMAIN_UST:
2129 {
2130 struct lttng_ht_iter iter;
2131 struct ltt_ust_channel *uchan;
2132
2133 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2134 &iter.iter, uchan, node.node) {
2135 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2136 channels[i].attr.overwrite = uchan->attr.overwrite;
2137 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2138 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2139 channels[i].attr.switch_timer_interval =
2140 uchan->attr.switch_timer_interval;
2141 channels[i].attr.read_timer_interval =
2142 uchan->attr.read_timer_interval;
2143 channels[i].enabled = uchan->enabled;
2144 switch (uchan->attr.output) {
2145 case LTTNG_UST_MMAP:
2146 default:
2147 channels[i].attr.output = LTTNG_EVENT_MMAP;
2148 break;
2149 }
2150 i++;
2151 }
2152 break;
2153 }
2154 default:
2155 break;
2156 }
2157}
2158
2159/*
2160 * Create a list of ust global domain events.
2161 */
2162static int list_lttng_ust_global_events(char *channel_name,
2163 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2164{
2165 int i = 0, ret = 0;
2166 unsigned int nb_event = 0;
2167 struct lttng_ht_iter iter;
2168 struct lttng_ht_node_str *node;
2169 struct ltt_ust_channel *uchan;
2170 struct ltt_ust_event *uevent;
2171 struct lttng_event *tmp;
2172
2173 DBG("Listing UST global events for channel %s", channel_name);
2174
2175 rcu_read_lock();
2176
2177 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2178 node = lttng_ht_iter_get_node_str(&iter);
2179 if (node == NULL) {
2180 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2181 goto error;
2182 }
2183
2184 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2185
2186 nb_event += lttng_ht_get_count(uchan->events);
2187
2188 if (nb_event == 0) {
2189 ret = nb_event;
2190 goto error;
2191 }
2192
2193 DBG3("Listing UST global %d events", nb_event);
2194
2195 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2196 if (tmp == NULL) {
2197 ret = -LTTCOMM_FATAL;
2198 goto error;
2199 }
2200
2201 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2202 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2203 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2204 tmp[i].enabled = uevent->enabled;
2205 switch (uevent->attr.instrumentation) {
2206 case LTTNG_UST_TRACEPOINT:
2207 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2208 break;
2209 case LTTNG_UST_PROBE:
2210 tmp[i].type = LTTNG_EVENT_PROBE;
2211 break;
2212 case LTTNG_UST_FUNCTION:
2213 tmp[i].type = LTTNG_EVENT_FUNCTION;
2214 break;
2215 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2216 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2217 break;
2218 }
2219 i++;
2220 }
2221
2222 ret = nb_event;
2223 *events = tmp;
2224
2225error:
2226 rcu_read_unlock();
2227 return ret;
2228}
2229
2230/*
2231 * Fill lttng_event array of all kernel events in the channel.
2232 */
2233static int list_lttng_kernel_events(char *channel_name,
2234 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2235{
2236 int i = 0, ret;
2237 unsigned int nb_event;
2238 struct ltt_kernel_event *event;
2239 struct ltt_kernel_channel *kchan;
2240
2241 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2242 if (kchan == NULL) {
2243 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2244 goto error;
2245 }
2246
2247 nb_event = kchan->event_count;
2248
2249 DBG("Listing events for channel %s", kchan->channel->name);
2250
2251 if (nb_event == 0) {
2252 ret = nb_event;
2253 goto error;
2254 }
2255
2256 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2257 if (*events == NULL) {
2258 ret = LTTCOMM_FATAL;
2259 goto error;
2260 }
2261
2262 /* Kernel channels */
2263 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2264 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2265 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2266 (*events)[i].enabled = event->enabled;
2267 switch (event->event->instrumentation) {
2268 case LTTNG_KERNEL_TRACEPOINT:
2269 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2270 break;
2271 case LTTNG_KERNEL_KPROBE:
2272 case LTTNG_KERNEL_KRETPROBE:
2273 (*events)[i].type = LTTNG_EVENT_PROBE;
2274 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2275 sizeof(struct lttng_kernel_kprobe));
2276 break;
2277 case LTTNG_KERNEL_FUNCTION:
2278 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2279 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2280 sizeof(struct lttng_kernel_function));
2281 break;
2282 case LTTNG_KERNEL_NOOP:
2283 (*events)[i].type = LTTNG_EVENT_NOOP;
2284 break;
2285 case LTTNG_KERNEL_SYSCALL:
2286 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2287 break;
2288 case LTTNG_KERNEL_ALL:
2289 assert(0);
2290 break;
2291 }
2292 i++;
2293 }
2294
2295 return nb_event;
2296
2297error:
2298 return ret;
2299}
2300
2301/*
2302 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2303 */
2304static int cmd_disable_channel(struct ltt_session *session,
2305 int domain, char *channel_name)
2306{
2307 int ret;
2308 struct ltt_ust_session *usess;
2309
2310 usess = session->ust_session;
2311
2312 switch (domain) {
2313 case LTTNG_DOMAIN_KERNEL:
2314 {
2315 ret = channel_kernel_disable(session->kernel_session,
2316 channel_name);
2317 if (ret != LTTCOMM_OK) {
2318 goto error;
2319 }
2320
2321 kernel_wait_quiescent(kernel_tracer_fd);
2322 break;
2323 }
2324 case LTTNG_DOMAIN_UST:
2325 {
2326 struct ltt_ust_channel *uchan;
2327 struct lttng_ht *chan_ht;
2328
2329 chan_ht = usess->domain_global.channels;
2330
2331 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2332 if (uchan == NULL) {
2333 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2334 goto error;
2335 }
2336
2337 ret = channel_ust_disable(usess, domain, uchan);
2338 if (ret != LTTCOMM_OK) {
2339 goto error;
2340 }
2341 break;
2342 }
2343 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2344 case LTTNG_DOMAIN_UST_EXEC_NAME:
2345 case LTTNG_DOMAIN_UST_PID:
2346 ret = LTTCOMM_NOT_IMPLEMENTED;
2347 goto error;
2348 default:
2349 ret = LTTCOMM_UNKNOWN_DOMAIN;
2350 goto error;
2351 }
2352
2353 ret = LTTCOMM_OK;
2354
2355error:
2356 return ret;
2357}
2358
2359/*
2360 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2361 */
2362static int cmd_enable_channel(struct ltt_session *session,
2363 int domain, struct lttng_channel *attr)
2364{
2365 int ret;
2366 struct ltt_ust_session *usess = session->ust_session;
2367 struct lttng_ht *chan_ht;
2368
2369 DBG("Enabling channel %s for session %s", attr->name, session->name);
2370
2371 switch (domain) {
2372 case LTTNG_DOMAIN_KERNEL:
2373 {
2374 struct ltt_kernel_channel *kchan;
2375
2376 kchan = trace_kernel_get_channel_by_name(attr->name,
2377 session->kernel_session);
2378 if (kchan == NULL) {
2379 ret = channel_kernel_create(session->kernel_session,
2380 attr, kernel_poll_pipe[1]);
2381 } else {
2382 ret = channel_kernel_enable(session->kernel_session, kchan);
2383 }
2384
2385 if (ret != LTTCOMM_OK) {
2386 goto error;
2387 }
2388
2389 kernel_wait_quiescent(kernel_tracer_fd);
2390 break;
2391 }
2392 case LTTNG_DOMAIN_UST:
2393 {
2394 struct ltt_ust_channel *uchan;
2395
2396 chan_ht = usess->domain_global.channels;
2397
2398 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2399 if (uchan == NULL) {
2400 ret = channel_ust_create(usess, domain, attr);
2401 } else {
2402 ret = channel_ust_enable(usess, domain, uchan);
2403 }
2404 break;
2405 }
2406 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2407 case LTTNG_DOMAIN_UST_EXEC_NAME:
2408 case LTTNG_DOMAIN_UST_PID:
2409 ret = LTTCOMM_NOT_IMPLEMENTED;
2410 goto error;
2411 default:
2412 ret = LTTCOMM_UNKNOWN_DOMAIN;
2413 goto error;
2414 }
2415
2416error:
2417 return ret;
2418}
2419
2420/*
2421 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2422 */
2423static int cmd_disable_event(struct ltt_session *session, int domain,
2424 char *channel_name, char *event_name)
2425{
2426 int ret;
2427
2428 switch (domain) {
2429 case LTTNG_DOMAIN_KERNEL:
2430 {
2431 struct ltt_kernel_channel *kchan;
2432 struct ltt_kernel_session *ksess;
2433
2434 ksess = session->kernel_session;
2435
2436 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2437 if (kchan == NULL) {
2438 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2439 goto error;
2440 }
2441
2442 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2443 if (ret != LTTCOMM_OK) {
2444 goto error;
2445 }
2446
2447 kernel_wait_quiescent(kernel_tracer_fd);
2448 break;
2449 }
2450 case LTTNG_DOMAIN_UST:
2451 {
2452 struct ltt_ust_channel *uchan;
2453 struct ltt_ust_session *usess;
2454
2455 usess = session->ust_session;
2456
2457 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2458 channel_name);
2459 if (uchan == NULL) {
2460 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2461 goto error;
2462 }
2463
2464 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2465 if (ret != LTTCOMM_OK) {
2466 goto error;
2467 }
2468
2469 DBG3("Disable UST event %s in channel %s completed", event_name,
2470 channel_name);
2471 break;
2472 }
2473 case LTTNG_DOMAIN_UST_EXEC_NAME:
2474 case LTTNG_DOMAIN_UST_PID:
2475 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2476 default:
2477 ret = LTTCOMM_NOT_IMPLEMENTED;
2478 goto error;
2479 }
2480
2481 ret = LTTCOMM_OK;
2482
2483error:
2484 return ret;
2485}
2486
2487/*
2488 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2489 */
2490static int cmd_disable_event_all(struct ltt_session *session, int domain,
2491 char *channel_name)
2492{
2493 int ret;
2494
2495 switch (domain) {
2496 case LTTNG_DOMAIN_KERNEL:
2497 {
2498 struct ltt_kernel_session *ksess;
2499 struct ltt_kernel_channel *kchan;
2500
2501 ksess = session->kernel_session;
2502
2503 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2504 if (kchan == NULL) {
2505 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2506 goto error;
2507 }
2508
2509 ret = event_kernel_disable_all(ksess, kchan);
2510 if (ret != LTTCOMM_OK) {
2511 goto error;
2512 }
2513
2514 kernel_wait_quiescent(kernel_tracer_fd);
2515 break;
2516 }
2517 case LTTNG_DOMAIN_UST:
2518 {
2519 struct ltt_ust_session *usess;
2520 struct ltt_ust_channel *uchan;
2521
2522 usess = session->ust_session;
2523
2524 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2525 channel_name);
2526 if (uchan == NULL) {
2527 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2528 goto error;
2529 }
2530
2531 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2532 if (ret != 0) {
2533 goto error;
2534 }
2535
2536 DBG3("Disable all UST events in channel %s completed", channel_name);
2537
2538 break;
2539 }
2540 case LTTNG_DOMAIN_UST_EXEC_NAME:
2541 case LTTNG_DOMAIN_UST_PID:
2542 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2543 default:
2544 ret = LTTCOMM_NOT_IMPLEMENTED;
2545 goto error;
2546 }
2547
2548 ret = LTTCOMM_OK;
2549
2550error:
2551 return ret;
2552}
2553
2554/*
2555 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2556 */
2557static int cmd_add_context(struct ltt_session *session, int domain,
2558 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2559{
2560 int ret;
2561
2562 switch (domain) {
2563 case LTTNG_DOMAIN_KERNEL:
2564 /* Add kernel context to kernel tracer */
2565 ret = context_kernel_add(session->kernel_session, ctx,
2566 event_name, channel_name);
2567 if (ret != LTTCOMM_OK) {
2568 goto error;
2569 }
2570 break;
2571 case LTTNG_DOMAIN_UST:
2572 {
2573 struct ltt_ust_session *usess = session->ust_session;
2574
2575 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2576 if (ret != LTTCOMM_OK) {
2577 goto error;
2578 }
2579 break;
2580 }
2581 case LTTNG_DOMAIN_UST_EXEC_NAME:
2582 case LTTNG_DOMAIN_UST_PID:
2583 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2584 default:
2585 ret = LTTCOMM_NOT_IMPLEMENTED;
2586 goto error;
2587 }
2588
2589 ret = LTTCOMM_OK;
2590
2591error:
2592 return ret;
2593}
2594
2595/*
2596 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2597 *
2598 * TODO: currently, both events and loglevels are kept within the same
2599 * namespace for UST global registry/app registery, so if an event
2600 * happen to have the same name as the loglevel (very unlikely though),
2601 * and an attempt is made to enable/disable both in the same session,
2602 * the first to be created will be the only one allowed to exist.
2603 */
2604static int cmd_enable_event(struct ltt_session *session, int domain,
2605 char *channel_name, struct lttng_event *event)
2606{
2607 int ret;
2608 struct lttng_channel *attr;
2609 struct ltt_ust_session *usess = session->ust_session;
2610
2611 switch (domain) {
2612 case LTTNG_DOMAIN_KERNEL:
2613 {
2614 struct ltt_kernel_channel *kchan;
2615
2616 kchan = trace_kernel_get_channel_by_name(channel_name,
2617 session->kernel_session);
2618 if (kchan == NULL) {
2619 attr = channel_new_default_attr(domain);
2620 if (attr == NULL) {
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
2624 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2625
2626 /* This call will notify the kernel thread */
2627 ret = channel_kernel_create(session->kernel_session,
2628 attr, kernel_poll_pipe[1]);
2629 if (ret != LTTCOMM_OK) {
2630 free(attr);
2631 goto error;
2632 }
2633 free(attr);
2634 }
2635
2636 /* Get the newly created kernel channel pointer */
2637 kchan = trace_kernel_get_channel_by_name(channel_name,
2638 session->kernel_session);
2639 if (kchan == NULL) {
2640 /* This sould not happen... */
2641 ret = LTTCOMM_FATAL;
2642 goto error;
2643 }
2644
2645 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2646 event);
2647 if (ret != LTTCOMM_OK) {
2648 goto error;
2649 }
2650
2651 kernel_wait_quiescent(kernel_tracer_fd);
2652 break;
2653 }
2654 case LTTNG_DOMAIN_UST:
2655 {
2656 struct lttng_channel *attr;
2657 struct ltt_ust_channel *uchan;
2658
2659 /* Get channel from global UST domain */
2660 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2661 channel_name);
2662 if (uchan == NULL) {
2663 /* Create default channel */
2664 attr = channel_new_default_attr(domain);
2665 if (attr == NULL) {
2666 ret = LTTCOMM_FATAL;
2667 goto error;
2668 }
2669 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2670 attr->name[NAME_MAX - 1] = '\0';
2671
2672 ret = channel_ust_create(usess, domain, attr);
2673 if (ret != LTTCOMM_OK) {
2674 free(attr);
2675 goto error;
2676 }
2677 free(attr);
2678
2679 /* Get the newly created channel reference back */
2680 uchan = trace_ust_find_channel_by_name(
2681 usess->domain_global.channels, channel_name);
2682 if (uchan == NULL) {
2683 /* Something is really wrong */
2684 ret = LTTCOMM_FATAL;
2685 goto error;
2686 }
2687 }
2688
2689 /* At this point, the session and channel exist on the tracer */
2690 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2691 if (ret != LTTCOMM_OK) {
2692 goto error;
2693 }
2694 break;
2695 }
2696 case LTTNG_DOMAIN_UST_EXEC_NAME:
2697 case LTTNG_DOMAIN_UST_PID:
2698 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2699 default:
2700 ret = LTTCOMM_NOT_IMPLEMENTED;
2701 goto error;
2702 }
2703
2704 ret = LTTCOMM_OK;
2705
2706error:
2707 return ret;
2708}
2709
2710/*
2711 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2712 */
2713static int cmd_enable_event_all(struct ltt_session *session, int domain,
2714 char *channel_name, int event_type)
2715{
2716 int ret;
2717 struct ltt_kernel_channel *kchan;
2718
2719 switch (domain) {
2720 case LTTNG_DOMAIN_KERNEL:
2721 kchan = trace_kernel_get_channel_by_name(channel_name,
2722 session->kernel_session);
2723 if (kchan == NULL) {
2724 /* This call will notify the kernel thread */
2725 ret = channel_kernel_create(session->kernel_session, NULL,
2726 kernel_poll_pipe[1]);
2727 if (ret != LTTCOMM_OK) {
2728 goto error;
2729 }
2730
2731 /* Get the newly created kernel channel pointer */
2732 kchan = trace_kernel_get_channel_by_name(channel_name,
2733 session->kernel_session);
2734 if (kchan == NULL) {
2735 /* This sould not happen... */
2736 ret = LTTCOMM_FATAL;
2737 goto error;
2738 }
2739
2740 }
2741
2742 switch (event_type) {
2743 case LTTNG_EVENT_SYSCALL:
2744 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2745 kchan, kernel_tracer_fd);
2746 break;
2747 case LTTNG_EVENT_TRACEPOINT:
2748 /*
2749 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2750 * events already registered to the channel.
2751 */
2752 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2753 kchan, kernel_tracer_fd);
2754 break;
2755 case LTTNG_EVENT_ALL:
2756 /* Enable syscalls and tracepoints */
2757 ret = event_kernel_enable_all(session->kernel_session,
2758 kchan, kernel_tracer_fd);
2759 break;
2760 default:
2761 ret = LTTCOMM_KERN_ENABLE_FAIL;
2762 goto error;
2763 }
2764
2765 /* Manage return value */
2766 if (ret != LTTCOMM_OK) {
2767 goto error;
2768 }
2769
2770 kernel_wait_quiescent(kernel_tracer_fd);
2771 break;
2772 case LTTNG_DOMAIN_UST:
2773 {
2774 struct lttng_channel *attr;
2775 struct ltt_ust_channel *uchan;
2776 struct ltt_ust_session *usess = session->ust_session;
2777
2778 /* Get channel from global UST domain */
2779 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2780 channel_name);
2781 if (uchan == NULL) {
2782 /* Create default channel */
2783 attr = channel_new_default_attr(domain);
2784 if (attr == NULL) {
2785 ret = LTTCOMM_FATAL;
2786 goto error;
2787 }
2788 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2789 attr->name[NAME_MAX - 1] = '\0';
2790
2791 /* Use the internal command enable channel */
2792 ret = channel_ust_create(usess, domain, attr);
2793 if (ret != LTTCOMM_OK) {
2794 free(attr);
2795 goto error;
2796 }
2797 free(attr);
2798
2799 /* Get the newly created channel reference back */
2800 uchan = trace_ust_find_channel_by_name(
2801 usess->domain_global.channels, channel_name);
2802 if (uchan == NULL) {
2803 /* Something is really wrong */
2804 ret = LTTCOMM_FATAL;
2805 goto error;
2806 }
2807 }
2808
2809 /* At this point, the session and channel exist on the tracer */
2810
2811 switch (event_type) {
2812 case LTTNG_EVENT_ALL:
2813 case LTTNG_EVENT_TRACEPOINT:
2814 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2815 if (ret != LTTCOMM_OK) {
2816 goto error;
2817 }
2818 break;
2819 default:
2820 ret = LTTCOMM_UST_ENABLE_FAIL;
2821 goto error;
2822 }
2823
2824 /* Manage return value */
2825 if (ret != LTTCOMM_OK) {
2826 goto error;
2827 }
2828
2829 break;
2830 }
2831 case LTTNG_DOMAIN_UST_EXEC_NAME:
2832 case LTTNG_DOMAIN_UST_PID:
2833 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2834 default:
2835 ret = LTTCOMM_NOT_IMPLEMENTED;
2836 goto error;
2837 }
2838
2839 ret = LTTCOMM_OK;
2840
2841error:
2842 return ret;
2843}
2844
2845/*
2846 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2847 */
2848static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2849{
2850 int ret;
2851 ssize_t nb_events = 0;
2852
2853 switch (domain) {
2854 case LTTNG_DOMAIN_KERNEL:
2855 nb_events = kernel_list_events(kernel_tracer_fd, events);
2856 if (nb_events < 0) {
2857 ret = LTTCOMM_KERN_LIST_FAIL;
2858 goto error;
2859 }
2860 break;
2861 case LTTNG_DOMAIN_UST:
2862 nb_events = ust_app_list_events(events);
2863 if (nb_events < 0) {
2864 ret = LTTCOMM_UST_LIST_FAIL;
2865 goto error;
2866 }
2867 break;
2868 default:
2869 ret = LTTCOMM_NOT_IMPLEMENTED;
2870 goto error;
2871 }
2872
2873 return nb_events;
2874
2875error:
2876 /* Return negative value to differentiate return code */
2877 return -ret;
2878}
2879
2880/*
2881 * Command LTTNG_START_TRACE processed by the client thread.
2882 */
2883static int cmd_start_trace(struct ltt_session *session)
2884{
2885 int ret;
2886 struct ltt_kernel_session *ksession;
2887 struct ltt_ust_session *usess;
2888
2889 /* Short cut */
2890 ksession = session->kernel_session;
2891 usess = session->ust_session;
2892
2893 if (session->enabled) {
2894 ret = LTTCOMM_UST_START_FAIL;
2895 goto error;
2896 }
2897
2898 session->enabled = 1;
2899
2900 /* Kernel tracing */
2901 if (ksession != NULL) {
2902 struct ltt_kernel_channel *kchan;
2903
2904 /* Open kernel metadata */
2905 if (ksession->metadata == NULL) {
2906 ret = kernel_open_metadata(ksession, ksession->trace_path);
2907 if (ret < 0) {
2908 ret = LTTCOMM_KERN_META_FAIL;
2909 goto error;
2910 }
2911 }
2912
2913 /* Open kernel metadata stream */
2914 if (ksession->metadata_stream_fd == 0) {
2915 ret = kernel_open_metadata_stream(ksession);
2916 if (ret < 0) {
2917 ERR("Kernel create metadata stream failed");
2918 ret = LTTCOMM_KERN_STREAM_FAIL;
2919 goto error;
2920 }
2921 }
2922
2923 /* For each channel */
2924 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2925 if (kchan->stream_count == 0) {
2926 ret = kernel_open_channel_stream(kchan);
2927 if (ret < 0) {
2928 ret = LTTCOMM_KERN_STREAM_FAIL;
2929 goto error;
2930 }
2931 /* Update the stream global counter */
2932 ksession->stream_count_global += ret;
2933 }
2934 }
2935
2936 /* Setup kernel consumer socket and send fds to it */
2937 ret = init_kernel_tracing(ksession);
2938 if (ret < 0) {
2939 ret = LTTCOMM_KERN_START_FAIL;
2940 goto error;
2941 }
2942
2943 /* This start the kernel tracing */
2944 ret = kernel_start_session(ksession);
2945 if (ret < 0) {
2946 ret = LTTCOMM_KERN_START_FAIL;
2947 goto error;
2948 }
2949
2950 /* Quiescent wait after starting trace */
2951 kernel_wait_quiescent(kernel_tracer_fd);
2952 }
2953
2954 /* Flag session that trace should start automatically */
2955 if (usess) {
2956 usess->start_trace = 1;
2957
2958 ret = ust_app_start_trace_all(usess);
2959 if (ret < 0) {
2960 ret = LTTCOMM_UST_START_FAIL;
2961 goto error;
2962 }
2963 }
2964
2965 ret = LTTCOMM_OK;
2966
2967error:
2968 return ret;
2969}
2970
2971/*
2972 * Command LTTNG_STOP_TRACE processed by the client thread.
2973 */
2974static int cmd_stop_trace(struct ltt_session *session)
2975{
2976 int ret;
2977 struct ltt_kernel_channel *kchan;
2978 struct ltt_kernel_session *ksession;
2979 struct ltt_ust_session *usess;
2980
2981 /* Short cut */
2982 ksession = session->kernel_session;
2983 usess = session->ust_session;
2984
2985 if (!session->enabled) {
2986 ret = LTTCOMM_UST_STOP_FAIL;
2987 goto error;
2988 }
2989
2990 session->enabled = 0;
2991
2992 /* Kernel tracer */
2993 if (ksession != NULL) {
2994 DBG("Stop kernel tracing");
2995
2996 /* Flush all buffers before stopping */
2997 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2998 if (ret < 0) {
2999 ERR("Kernel metadata flush failed");
3000 }
3001
3002 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3003 ret = kernel_flush_buffer(kchan);
3004 if (ret < 0) {
3005 ERR("Kernel flush buffer error");
3006 }
3007 }
3008
3009 ret = kernel_stop_session(ksession);
3010 if (ret < 0) {
3011 ret = LTTCOMM_KERN_STOP_FAIL;
3012 goto error;
3013 }
3014
3015 kernel_wait_quiescent(kernel_tracer_fd);
3016 }
3017
3018 if (usess) {
3019 usess->start_trace = 0;
3020
3021 ret = ust_app_stop_trace_all(usess);
3022 if (ret < 0) {
3023 ret = LTTCOMM_UST_STOP_FAIL;
3024 goto error;
3025 }
3026 }
3027
3028 ret = LTTCOMM_OK;
3029
3030error:
3031 return ret;
3032}
3033
3034/*
3035 * Command LTTNG_CREATE_SESSION processed by the client thread.
3036 */
3037static int cmd_create_session(char *name, char *path, struct ucred *creds)
3038{
3039 int ret;
3040
3041 ret = session_create(name, path, creds->uid, creds->gid);
3042 if (ret != LTTCOMM_OK) {
3043 goto error;
3044 }
3045
3046 ret = LTTCOMM_OK;
3047
3048error:
3049 return ret;
3050}
3051
3052/*
3053 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3054 */
3055static int cmd_destroy_session(struct ltt_session *session, char *name)
3056{
3057 int ret;
3058
3059 /* Clean kernel session teardown */
3060 teardown_kernel_session(session);
3061 /* UST session teardown */
3062 teardown_ust_session(session);
3063
3064 /*
3065 * Must notify the kernel thread here to update it's poll setin order
3066 * to remove the channel(s)' fd just destroyed.
3067 */
3068 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3069 if (ret < 0) {
3070 perror("write kernel poll pipe");
3071 }
3072
3073 ret = session_destroy(session);
3074
3075 return ret;
3076}
3077
3078/*
3079 * Command LTTNG_CALIBRATE processed by the client thread.
3080 */
3081static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3082{
3083 int ret;
3084
3085 switch (domain) {
3086 case LTTNG_DOMAIN_KERNEL:
3087 {
3088 struct lttng_kernel_calibrate kcalibrate;
3089
3090 kcalibrate.type = calibrate->type;
3091 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3092 if (ret < 0) {
3093 ret = LTTCOMM_KERN_ENABLE_FAIL;
3094 goto error;
3095 }
3096 break;
3097 }
3098 default:
3099 /* TODO: Userspace tracing */
3100 ret = LTTCOMM_NOT_IMPLEMENTED;
3101 goto error;
3102 }
3103
3104 ret = LTTCOMM_OK;
3105
3106error:
3107 return ret;
3108}
3109
3110/*
3111 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3112 */
3113static int cmd_register_consumer(struct ltt_session *session, int domain,
3114 char *sock_path)
3115{
3116 int ret, sock;
3117
3118 switch (domain) {
3119 case LTTNG_DOMAIN_KERNEL:
3120 /* Can't register a consumer if there is already one */
3121 if (session->kernel_session->consumer_fds_sent != 0) {
3122 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3123 goto error;
3124 }
3125
3126 sock = lttcomm_connect_unix_sock(sock_path);
3127 if (sock < 0) {
3128 ret = LTTCOMM_CONNECT_FAIL;
3129 goto error;
3130 }
3131
3132 session->kernel_session->consumer_fd = sock;
3133 break;
3134 default:
3135 /* TODO: Userspace tracing */
3136 ret = LTTCOMM_NOT_IMPLEMENTED;
3137 goto error;
3138 }
3139
3140 ret = LTTCOMM_OK;
3141
3142error:
3143 return ret;
3144}
3145
3146/*
3147 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3148 */
3149static ssize_t cmd_list_domains(struct ltt_session *session,
3150 struct lttng_domain **domains)
3151{
3152 int ret, index = 0;
3153 ssize_t nb_dom = 0;
3154
3155 if (session->kernel_session != NULL) {
3156 DBG3("Listing domains found kernel domain");
3157 nb_dom++;
3158 }
3159
3160 if (session->ust_session != NULL) {
3161 DBG3("Listing domains found UST global domain");
3162 nb_dom++;
3163 }
3164
3165 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3166 if (*domains == NULL) {
3167 ret = -LTTCOMM_FATAL;
3168 goto error;
3169 }
3170
3171 if (session->kernel_session != NULL) {
3172 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3173 index++;
3174 }
3175
3176 if (session->ust_session != NULL) {
3177 (*domains)[index].type = LTTNG_DOMAIN_UST;
3178 index++;
3179 }
3180
3181 return nb_dom;
3182
3183error:
3184 return ret;
3185}
3186
3187/*
3188 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3189 */
3190static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3191 struct lttng_channel **channels)
3192{
3193 int ret;
3194 ssize_t nb_chan = 0;
3195
3196 switch (domain) {
3197 case LTTNG_DOMAIN_KERNEL:
3198 if (session->kernel_session != NULL) {
3199 nb_chan = session->kernel_session->channel_count;
3200 }
3201 DBG3("Number of kernel channels %zd", nb_chan);
3202 break;
3203 case LTTNG_DOMAIN_UST:
3204 if (session->ust_session != NULL) {
3205 nb_chan = lttng_ht_get_count(
3206 session->ust_session->domain_global.channels);
3207 }
3208 DBG3("Number of UST global channels %zd", nb_chan);
3209 break;
3210 default:
3211 *channels = NULL;
3212 ret = -LTTCOMM_NOT_IMPLEMENTED;
3213 goto error;
3214 }
3215
3216 if (nb_chan > 0) {
3217 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3218 if (*channels == NULL) {
3219 ret = -LTTCOMM_FATAL;
3220 goto error;
3221 }
3222
3223 list_lttng_channels(domain, session, *channels);
3224 } else {
3225 *channels = NULL;
3226 }
3227
3228 return nb_chan;
3229
3230error:
3231 return ret;
3232}
3233
3234/*
3235 * Command LTTNG_LIST_EVENTS processed by the client thread.
3236 */
3237static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3238 char *channel_name, struct lttng_event **events)
3239{
3240 int ret = 0;
3241 ssize_t nb_event = 0;
3242
3243 switch (domain) {
3244 case LTTNG_DOMAIN_KERNEL:
3245 if (session->kernel_session != NULL) {
3246 nb_event = list_lttng_kernel_events(channel_name,
3247 session->kernel_session, events);
3248 }
3249 break;
3250 case LTTNG_DOMAIN_UST:
3251 {
3252 if (session->ust_session != NULL) {
3253 nb_event = list_lttng_ust_global_events(channel_name,
3254 &session->ust_session->domain_global, events);
3255 }
3256 break;
3257 }
3258 default:
3259 ret = -LTTCOMM_NOT_IMPLEMENTED;
3260 goto error;
3261 }
3262
3263 ret = nb_event;
3264
3265error:
3266 return ret;
3267}
3268
3269/*
3270 * Process the command requested by the lttng client within the command
3271 * context structure. This function make sure that the return structure (llm)
3272 * is set and ready for transmission before returning.
3273 *
3274 * Return any error encountered or 0 for success.
3275 */
3276static int process_client_msg(struct command_ctx *cmd_ctx)
3277{
3278 int ret = LTTCOMM_OK;
3279 int need_tracing_session = 1;
3280
3281 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3282
3283 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3284 ret = LTTCOMM_KERN_NA;
3285 goto error;
3286 }
3287
3288 /*
3289 * Check for command that don't needs to allocate a returned payload. We do
3290 * this here so we don't have to make the call for no payload at each
3291 * command.
3292 */
3293 switch(cmd_ctx->lsm->cmd_type) {
3294 case LTTNG_LIST_SESSIONS:
3295 case LTTNG_LIST_TRACEPOINTS:
3296 case LTTNG_LIST_DOMAINS:
3297 case LTTNG_LIST_CHANNELS:
3298 case LTTNG_LIST_EVENTS:
3299 break;
3300 default:
3301 /* Setup lttng message with no payload */
3302 ret = setup_lttng_msg(cmd_ctx, 0);
3303 if (ret < 0) {
3304 /* This label does not try to unlock the session */
3305 goto init_setup_error;
3306 }
3307 }
3308
3309 /* Commands that DO NOT need a session. */
3310 switch (cmd_ctx->lsm->cmd_type) {
3311 case LTTNG_CALIBRATE:
3312 case LTTNG_CREATE_SESSION:
3313 case LTTNG_LIST_SESSIONS:
3314 case LTTNG_LIST_TRACEPOINTS:
3315 need_tracing_session = 0;
3316 break;
3317 default:
3318 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3319 session_lock_list();
3320 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3321 session_unlock_list();
3322 if (cmd_ctx->session == NULL) {
3323 if (cmd_ctx->lsm->session.name != NULL) {
3324 ret = LTTCOMM_SESS_NOT_FOUND;
3325 } else {
3326 /* If no session name specified */
3327 ret = LTTCOMM_SELECT_SESS;
3328 }
3329 goto error;
3330 } else {
3331 /* Acquire lock for the session */
3332 session_lock(cmd_ctx->session);
3333 }
3334 break;
3335 }
3336
3337 /*
3338 * Check domain type for specific "pre-action".
3339 */
3340 switch (cmd_ctx->lsm->domain.type) {
3341 case LTTNG_DOMAIN_KERNEL:
3342 /* Kernel tracer check */
3343 if (kernel_tracer_fd == 0) {
3344 /* Basically, load kernel tracer modules */
3345 init_kernel_tracer();
3346 if (kernel_tracer_fd == 0) {
3347 ret = LTTCOMM_KERN_NA;
3348 goto error;
3349 }
3350 }
3351
3352 /* Need a session for kernel command */
3353 if (need_tracing_session) {
3354 if (cmd_ctx->session->kernel_session == NULL) {
3355 ret = create_kernel_session(cmd_ctx->session);
3356 if (ret < 0) {
3357 ret = LTTCOMM_KERN_SESS_FAIL;
3358 goto error;
3359 }
3360 }
3361
3362 /* Start the kernel consumer daemon */
3363 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3364 if (kconsumer_data.pid == 0 &&
3365 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3366 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3367 ret = start_consumerd(&kconsumer_data);
3368 if (ret < 0) {
3369 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3370 goto error;
3371 }
3372 } else {
3373 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3374 }
3375 }
3376 break;
3377 case LTTNG_DOMAIN_UST:
3378 {
3379 if (need_tracing_session) {
3380 if (cmd_ctx->session->ust_session == NULL) {
3381 ret = create_ust_session(cmd_ctx->session,
3382 &cmd_ctx->lsm->domain);
3383 if (ret != LTTCOMM_OK) {
3384 goto error;
3385 }
3386 }
3387 /* Start the UST consumer daemons */
3388 /* 64-bit */
3389 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3390 if (consumerd64_bin[0] != '\0' &&
3391 ustconsumer64_data.pid == 0 &&
3392 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3393 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3394 ret = start_consumerd(&ustconsumer64_data);
3395 if (ret < 0) {
3396 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3397 ust_consumerd64_fd = -EINVAL;
3398 goto error;
3399 }
3400
3401 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3402 } else {
3403 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3404 }
3405 /* 32-bit */
3406 if (consumerd32_bin[0] != '\0' &&
3407 ustconsumer32_data.pid == 0 &&
3408 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3409 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3410 ret = start_consumerd(&ustconsumer32_data);
3411 if (ret < 0) {
3412 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3413 ust_consumerd32_fd = -EINVAL;
3414 goto error;
3415 }
3416 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3417 } else {
3418 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3419 }
3420 }
3421 break;
3422 }
3423 default:
3424 break;
3425 }
3426
3427 /*
3428 * Check that the UID or GID match that of the tracing session.
3429 * The root user can interact with all sessions.
3430 */
3431 if (need_tracing_session) {
3432 if (!session_access_ok(cmd_ctx->session,
3433 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3434 ret = LTTCOMM_EPERM;
3435 goto error;
3436 }
3437 }
3438
3439 /* Process by command type */
3440 switch (cmd_ctx->lsm->cmd_type) {
3441 case LTTNG_ADD_CONTEXT:
3442 {
3443 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3444 cmd_ctx->lsm->u.context.channel_name,
3445 cmd_ctx->lsm->u.context.event_name,
3446 &cmd_ctx->lsm->u.context.ctx);
3447 break;
3448 }
3449 case LTTNG_DISABLE_CHANNEL:
3450 {
3451 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3452 cmd_ctx->lsm->u.disable.channel_name);
3453 break;
3454 }
3455 case LTTNG_DISABLE_EVENT:
3456 {
3457 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3458 cmd_ctx->lsm->u.disable.channel_name,
3459 cmd_ctx->lsm->u.disable.name);
3460 ret = LTTCOMM_OK;
3461 break;
3462 }
3463 case LTTNG_DISABLE_ALL_EVENT:
3464 {
3465 DBG("Disabling all events");
3466
3467 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3468 cmd_ctx->lsm->u.disable.channel_name);
3469 break;
3470 }
3471 case LTTNG_ENABLE_CHANNEL:
3472 {
3473 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3474 &cmd_ctx->lsm->u.channel.chan);
3475 break;
3476 }
3477 case LTTNG_ENABLE_EVENT:
3478 {
3479 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3480 cmd_ctx->lsm->u.enable.channel_name,
3481 &cmd_ctx->lsm->u.enable.event);
3482 break;
3483 }
3484 case LTTNG_ENABLE_ALL_EVENT:
3485 {
3486 DBG("Enabling all events");
3487
3488 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3489 cmd_ctx->lsm->u.enable.channel_name,
3490 cmd_ctx->lsm->u.enable.event.type);
3491 break;
3492 }
3493 case LTTNG_LIST_TRACEPOINTS:
3494 {
3495 struct lttng_event *events;
3496 ssize_t nb_events;
3497
3498 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3499 if (nb_events < 0) {
3500 ret = -nb_events;
3501 goto error;
3502 }
3503
3504 /*
3505 * Setup lttng message with payload size set to the event list size in
3506 * bytes and then copy list into the llm payload.
3507 */
3508 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3509 if (ret < 0) {
3510 free(events);
3511 goto setup_error;
3512 }
3513
3514 /* Copy event list into message payload */
3515 memcpy(cmd_ctx->llm->payload, events,
3516 sizeof(struct lttng_event) * nb_events);
3517
3518 free(events);
3519
3520 ret = LTTCOMM_OK;
3521 break;
3522 }
3523 case LTTNG_START_TRACE:
3524 {
3525 ret = cmd_start_trace(cmd_ctx->session);
3526 break;
3527 }
3528 case LTTNG_STOP_TRACE:
3529 {
3530 ret = cmd_stop_trace(cmd_ctx->session);
3531 break;
3532 }
3533 case LTTNG_CREATE_SESSION:
3534 {
3535 tracepoint(create_session_start);
3536 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3537 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3538 tracepoint(create_session_end);
3539 break;
3540 }
3541 case LTTNG_DESTROY_SESSION:
3542 {
3543 tracepoint(destroy_session_start);
3544 ret = cmd_destroy_session(cmd_ctx->session,
3545 cmd_ctx->lsm->session.name);
3546 tracepoint(destroy_session_end);
3547 break;
3548 }
3549 case LTTNG_LIST_DOMAINS:
3550 {
3551 ssize_t nb_dom;
3552 struct lttng_domain *domains;
3553
3554 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3555 if (nb_dom < 0) {
3556 ret = -nb_dom;
3557 goto error;
3558 }
3559
3560 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3561 if (ret < 0) {
3562 goto setup_error;
3563 }
3564
3565 /* Copy event list into message payload */
3566 memcpy(cmd_ctx->llm->payload, domains,
3567 nb_dom * sizeof(struct lttng_domain));
3568
3569 free(domains);
3570
3571 ret = LTTCOMM_OK;
3572 break;
3573 }
3574 case LTTNG_LIST_CHANNELS:
3575 {
3576 size_t nb_chan;
3577 struct lttng_channel *channels;
3578
3579 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3580 cmd_ctx->session, &channels);
3581 if (nb_chan < 0) {
3582 ret = -nb_chan;
3583 goto error;
3584 }
3585
3586 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3587 if (ret < 0) {
3588 goto setup_error;
3589 }
3590
3591 /* Copy event list into message payload */
3592 memcpy(cmd_ctx->llm->payload, channels,
3593 nb_chan * sizeof(struct lttng_channel));
3594
3595 free(channels);
3596
3597 ret = LTTCOMM_OK;
3598 break;
3599 }
3600 case LTTNG_LIST_EVENTS:
3601 {
3602 ssize_t nb_event;
3603 struct lttng_event *events = NULL;
3604
3605 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3606 cmd_ctx->lsm->u.list.channel_name, &events);
3607 if (nb_event < 0) {
3608 ret = -nb_event;
3609 goto error;
3610 }
3611
3612 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3613 if (ret < 0) {
3614 goto setup_error;
3615 }
3616
3617 /* Copy event list into message payload */
3618 memcpy(cmd_ctx->llm->payload, events,
3619 nb_event * sizeof(struct lttng_event));
3620
3621 free(events);
3622
3623 ret = LTTCOMM_OK;
3624 break;
3625 }
3626 case LTTNG_LIST_SESSIONS:
3627 {
3628 unsigned int nr_sessions;
3629
3630 session_lock_list();
3631 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3632 if (nr_sessions == 0) {
3633 ret = LTTCOMM_NO_SESSION;
3634 session_unlock_list();
3635 goto error;
3636 }
3637 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3638 if (ret < 0) {
3639 session_unlock_list();
3640 goto setup_error;
3641 }
3642
3643 /* Filled the session array */
3644 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3645 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3646
3647 session_unlock_list();
3648
3649 ret = LTTCOMM_OK;
3650 break;
3651 }
3652 case LTTNG_CALIBRATE:
3653 {
3654 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3655 &cmd_ctx->lsm->u.calibrate);
3656 break;
3657 }
3658 case LTTNG_REGISTER_CONSUMER:
3659 {
3660 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3661 cmd_ctx->lsm->u.reg.path);
3662 break;
3663 }
3664 default:
3665 ret = LTTCOMM_UND;
3666 break;
3667 }
3668
3669error:
3670 if (cmd_ctx->llm == NULL) {
3671 DBG("Missing llm structure. Allocating one.");
3672 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3673 goto setup_error;
3674 }
3675 }
3676 /* Set return code */
3677 cmd_ctx->llm->ret_code = ret;
3678setup_error:
3679 if (cmd_ctx->session) {
3680 session_unlock(cmd_ctx->session);
3681 }
3682init_setup_error:
3683 return ret;
3684}
3685
3686/*
3687 * This thread manage all clients request using the unix client socket for
3688 * communication.
3689 */
3690static void *thread_manage_clients(void *data)
3691{
3692 int sock = 0, ret, i, pollfd;
3693 uint32_t revents, nb_fd;
3694 struct command_ctx *cmd_ctx = NULL;
3695 struct lttng_poll_event events;
3696
3697 tracepoint(sessiond_th_cli_start);
3698
3699 DBG("[thread] Manage client started");
3700
3701 rcu_register_thread();
3702
3703 ret = lttcomm_listen_unix_sock(client_sock);
3704 if (ret < 0) {
3705 goto error;
3706 }
3707
3708 /*
3709 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3710 * more will be added to this poll set.
3711 */
3712 ret = create_thread_poll_set(&events, 2);
3713 if (ret < 0) {
3714 goto error;
3715 }
3716
3717 /* Add the application registration socket */
3718 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3719 if (ret < 0) {
3720 goto error;
3721 }
3722
3723 /*
3724 * Notify parent pid that we are ready to accept command for client side.
3725 */
3726 if (opt_sig_parent) {
3727 kill(ppid, SIGCHLD);
3728 }
3729
3730 while (1) {
3731 DBG("Accepting client command ...");
3732
3733 tracepoint(sessiond_th_cli_poll);
3734
3735 nb_fd = LTTNG_POLL_GETNB(&events);
3736
3737 /* Inifinite blocking call, waiting for transmission */
3738 ret = lttng_poll_wait(&events, -1);
3739 if (ret < 0) {
3740 goto error;
3741 }
3742
3743 for (i = 0; i < nb_fd; i++) {
3744 /* Fetch once the poll data */
3745 revents = LTTNG_POLL_GETEV(&events, i);
3746 pollfd = LTTNG_POLL_GETFD(&events, i);
3747
3748 /* Thread quit pipe has been closed. Killing thread. */
3749 ret = check_thread_quit_pipe(pollfd, revents);
3750 if (ret) {
3751 goto error;
3752 }
3753
3754 /* Event on the registration socket */
3755 if (pollfd == client_sock) {
3756 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3757 ERR("Client socket poll error");
3758 goto error;
3759 }
3760 }
3761 }
3762
3763 DBG("Wait for client response");
3764
3765 sock = lttcomm_accept_unix_sock(client_sock);
3766 if (sock < 0) {
3767 goto error;
3768 }
3769
3770 /* Set socket option for credentials retrieval */
3771 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3772 if (ret < 0) {
3773 goto error;
3774 }
3775
3776 /* Allocate context command to process the client request */
3777 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3778 if (cmd_ctx == NULL) {
3779 perror("zmalloc cmd_ctx");
3780 goto error;
3781 }
3782
3783 /* Allocate data buffer for reception */
3784 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3785 if (cmd_ctx->lsm == NULL) {
3786 perror("zmalloc cmd_ctx->lsm");
3787 goto error;
3788 }
3789
3790 cmd_ctx->llm = NULL;
3791 cmd_ctx->session = NULL;
3792
3793 /*
3794 * Data is received from the lttng client. The struct
3795 * lttcomm_session_msg (lsm) contains the command and data request of
3796 * the client.
3797 */
3798 DBG("Receiving data from client ...");
3799 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3800 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3801 if (ret <= 0) {
3802 DBG("Nothing recv() from client... continuing");
3803 close(sock);
3804 free(cmd_ctx);
3805 continue;
3806 }
3807
3808 // TODO: Validate cmd_ctx including sanity check for
3809 // security purpose.
3810
3811 rcu_thread_online();
3812 /*
3813 * This function dispatch the work to the kernel or userspace tracer
3814 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3815 * informations for the client. The command context struct contains
3816 * everything this function may needs.
3817 */
3818 ret = process_client_msg(cmd_ctx);
3819 rcu_thread_offline();
3820 if (ret < 0) {
3821 /*
3822 * TODO: Inform client somehow of the fatal error. At
3823 * this point, ret < 0 means that a zmalloc failed
3824 * (ENOMEM). Error detected but still accept command.
3825 */
3826 clean_command_ctx(&cmd_ctx);
3827 continue;
3828 }
3829
3830 DBG("Sending response (size: %d, retcode: %s)",
3831 cmd_ctx->lttng_msg_size,
3832 lttng_strerror(-cmd_ctx->llm->ret_code));
3833 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3834 if (ret < 0) {
3835 ERR("Failed to send data back to client");
3836 }
3837
3838 /* End of transmission */
3839 close(sock);
3840
3841 clean_command_ctx(&cmd_ctx);
3842 }
3843
3844error:
3845 DBG("Client thread dying");
3846 unlink(client_unix_sock_path);
3847 close(client_sock);
3848 close(sock);
3849
3850 lttng_poll_clean(&events);
3851 clean_command_ctx(&cmd_ctx);
3852
3853 rcu_unregister_thread();
3854 return NULL;
3855}
3856
3857
3858/*
3859 * usage function on stderr
3860 */
3861static void usage(void)
3862{
3863 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3864 fprintf(stderr, " -h, --help Display this usage.\n");
3865 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3866 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3867 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3868 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3869 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3870 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3871 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3872 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3873 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3874 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3875 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3876 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3877 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3878 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3879 fprintf(stderr, " -V, --version Show version number.\n");
3880 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3881 fprintf(stderr, " -q, --quiet No output at all.\n");
3882 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3883 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3884 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3885}
3886
3887/*
3888 * daemon argument parsing
3889 */
3890static int parse_args(int argc, char **argv)
3891{
3892 int c;
3893
3894 static struct option long_options[] = {
3895 { "client-sock", 1, 0, 'c' },
3896 { "apps-sock", 1, 0, 'a' },
3897 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3898 { "kconsumerd-err-sock", 1, 0, 'E' },
3899 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3900 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3901 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3902 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3903 { "consumerd32-path", 1, 0, 'u' },
3904 { "consumerd32-libdir", 1, 0, 'U' },
3905 { "consumerd64-path", 1, 0, 't' },
3906 { "consumerd64-libdir", 1, 0, 'T' },
3907 { "daemonize", 0, 0, 'd' },
3908 { "sig-parent", 0, 0, 'S' },
3909 { "help", 0, 0, 'h' },
3910 { "group", 1, 0, 'g' },
3911 { "version", 0, 0, 'V' },
3912 { "quiet", 0, 0, 'q' },
3913 { "verbose", 0, 0, 'v' },
3914 { "verbose-consumer", 0, 0, 'Z' },
3915 { "no-kernel", 0, 0, 'N' },
3916 { NULL, 0, 0, 0 }
3917 };
3918
3919 while (1) {
3920 int option_index = 0;
3921 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3922 long_options, &option_index);
3923 if (c == -1) {
3924 break;
3925 }
3926
3927 switch (c) {
3928 case 0:
3929 fprintf(stderr, "option %s", long_options[option_index].name);
3930 if (optarg) {
3931 fprintf(stderr, " with arg %s\n", optarg);
3932 }
3933 break;
3934 case 'c':
3935 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3936 break;
3937 case 'a':
3938 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3939 break;
3940 case 'd':
3941 opt_daemon = 1;
3942 break;
3943 case 'g':
3944 opt_tracing_group = optarg;
3945 break;
3946 case 'h':
3947 usage();
3948 exit(EXIT_FAILURE);
3949 case 'V':
3950 fprintf(stdout, "%s\n", VERSION);
3951 exit(EXIT_SUCCESS);
3952 case 'S':
3953 opt_sig_parent = 1;
3954 break;
3955 case 'E':
3956 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3957 break;
3958 case 'C':
3959 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3960 break;
3961 case 'F':
3962 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3963 break;
3964 case 'D':
3965 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3966 break;
3967 case 'H':
3968 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3969 break;
3970 case 'G':
3971 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3972 break;
3973 case 'N':
3974 opt_no_kernel = 1;
3975 break;
3976 case 'q':
3977 opt_quiet = 1;
3978 break;
3979 case 'v':
3980 /* Verbose level can increase using multiple -v */
3981 opt_verbose += 1;
3982 break;
3983 case 'Z':
3984 opt_verbose_consumer += 1;
3985 break;
3986 case 'u':
3987 consumerd32_bin= optarg;
3988 break;
3989 case 'U':
3990 consumerd32_libdir = optarg;
3991 break;
3992 case 't':
3993 consumerd64_bin = optarg;
3994 break;
3995 case 'T':
3996 consumerd64_libdir = optarg;
3997 break;
3998 default:
3999 /* Unknown option or other error.
4000 * Error is printed by getopt, just return */
4001 return -1;
4002 }
4003 }
4004
4005 return 0;
4006}
4007
4008/*
4009 * Creates the two needed socket by the daemon.
4010 * apps_sock - The communication socket for all UST apps.
4011 * client_sock - The communication of the cli tool (lttng).
4012 */
4013static int init_daemon_socket(void)
4014{
4015 int ret = 0;
4016 mode_t old_umask;
4017
4018 old_umask = umask(0);
4019
4020 /* Create client tool unix socket */
4021 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4022 if (client_sock < 0) {
4023 ERR("Create unix sock failed: %s", client_unix_sock_path);
4024 ret = -1;
4025 goto end;
4026 }
4027
4028 /* File permission MUST be 660 */
4029 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4030 if (ret < 0) {
4031 ERR("Set file permissions failed: %s", client_unix_sock_path);
4032 perror("chmod");
4033 goto end;
4034 }
4035
4036 /* Create the application unix socket */
4037 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4038 if (apps_sock < 0) {
4039 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4040 ret = -1;
4041 goto end;
4042 }
4043
4044 /* File permission MUST be 666 */
4045 ret = chmod(apps_unix_sock_path,
4046 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4047 if (ret < 0) {
4048 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4049 perror("chmod");
4050 goto end;
4051 }
4052
4053end:
4054 umask(old_umask);
4055 return ret;
4056}
4057
4058/*
4059 * Check if the global socket is available, and if a daemon is answering at the
4060 * other side. If yes, error is returned.
4061 */
4062static int check_existing_daemon(void)
4063{
4064 if (access(client_unix_sock_path, F_OK) < 0 &&
4065 access(apps_unix_sock_path, F_OK) < 0) {
4066 return 0;
4067 }
4068
4069 /* Is there anybody out there ? */
4070 if (lttng_session_daemon_alive()) {
4071 return -EEXIST;
4072 } else {
4073 return 0;
4074 }
4075}
4076
4077/*
4078 * Set the tracing group gid onto the client socket.
4079 *
4080 * Race window between mkdir and chown is OK because we are going from more
4081 * permissive (root.root) to les permissive (root.tracing).
4082 */
4083static int set_permissions(char *rundir)
4084{
4085 int ret;
4086 gid_t gid;
4087
4088 gid = allowed_group();
4089 if (gid < 0) {
4090 WARN("No tracing group detected");
4091 ret = 0;
4092 goto end;
4093 }
4094
4095 /* Set lttng run dir */
4096 ret = chown(rundir, 0, gid);
4097 if (ret < 0) {
4098 ERR("Unable to set group on %s", rundir);
4099 perror("chown");
4100 }
4101
4102 /* lttng client socket path */
4103 ret = chown(client_unix_sock_path, 0, gid);
4104 if (ret < 0) {
4105 ERR("Unable to set group on %s", client_unix_sock_path);
4106 perror("chown");
4107 }
4108
4109 /* kconsumer error socket path */
4110 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4111 if (ret < 0) {
4112 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4113 perror("chown");
4114 }
4115
4116 /* 64-bit ustconsumer error socket path */
4117 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4118 if (ret < 0) {
4119 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4120 perror("chown");
4121 }
4122
4123 /* 32-bit ustconsumer compat32 error socket path */
4124 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4125 if (ret < 0) {
4126 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4127 perror("chown");
4128 }
4129
4130 DBG("All permissions are set");
4131
4132end:
4133 return ret;
4134}
4135
4136/*
4137 * Create the pipe used to wake up the kernel thread.
4138 */
4139static int create_kernel_poll_pipe(void)
4140{
4141 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4142}
4143
4144/*
4145 * Create the application command pipe to wake thread_manage_apps.
4146 */
4147static int create_apps_cmd_pipe(void)
4148{
4149 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4150}
4151
4152/*
4153 * Create the lttng run directory needed for all global sockets and pipe.
4154 */
4155static int create_lttng_rundir(const char *rundir)
4156{
4157 int ret;
4158
4159 DBG3("Creating LTTng run directory: %s", rundir);
4160
4161 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4162 if (ret < 0) {
4163 if (errno != EEXIST) {
4164 ERR("Unable to create %s", rundir);
4165 goto error;
4166 } else {
4167 ret = 0;
4168 }
4169 }
4170
4171error:
4172 return ret;
4173}
4174
4175/*
4176 * Setup sockets and directory needed by the kconsumerd communication with the
4177 * session daemon.
4178 */
4179static int set_consumer_sockets(struct consumer_data *consumer_data,
4180 const char *rundir)
4181{
4182 int ret;
4183 char path[PATH_MAX];
4184
4185 switch (consumer_data->type) {
4186 case LTTNG_CONSUMER_KERNEL:
4187 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4188 break;
4189 case LTTNG_CONSUMER64_UST:
4190 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4191 break;
4192 case LTTNG_CONSUMER32_UST:
4193 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4194 break;
4195 default:
4196 ERR("Consumer type unknown");
4197 ret = -EINVAL;
4198 goto error;
4199 }
4200
4201 DBG2("Creating consumer directory: %s", path);
4202
4203 ret = mkdir(path, S_IRWXU | S_IRWXG);
4204 if (ret < 0) {
4205 if (errno != EEXIST) {
4206 ERR("Failed to create %s", path);
4207 goto error;
4208 }
4209 ret = 0;
4210 }
4211
4212 /* Create the kconsumerd error unix socket */
4213 consumer_data->err_sock =
4214 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4215 if (consumer_data->err_sock < 0) {
4216 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4217 ret = -1;
4218 goto error;
4219 }
4220
4221 /* File permission MUST be 660 */
4222 ret = chmod(consumer_data->err_unix_sock_path,
4223 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4224 if (ret < 0) {
4225 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4226 PERROR("chmod");
4227 goto error;
4228 }
4229
4230error:
4231 return ret;
4232}
4233
4234/*
4235 * Signal handler for the daemon
4236 *
4237 * Simply stop all worker threads, leaving main() return gracefully after
4238 * joining all threads and calling cleanup().
4239 */
4240static void sighandler(int sig)
4241{
4242 switch (sig) {
4243 case SIGPIPE:
4244 DBG("SIGPIPE catched");
4245 return;
4246 case SIGINT:
4247 DBG("SIGINT catched");
4248 stop_threads();
4249 break;
4250 case SIGTERM:
4251 DBG("SIGTERM catched");
4252 stop_threads();
4253 break;
4254 default:
4255 break;
4256 }
4257}
4258
4259/*
4260 * Setup signal handler for :
4261 * SIGINT, SIGTERM, SIGPIPE
4262 */
4263static int set_signal_handler(void)
4264{
4265 int ret = 0;
4266 struct sigaction sa;
4267 sigset_t sigset;
4268
4269 if ((ret = sigemptyset(&sigset)) < 0) {
4270 perror("sigemptyset");
4271 return ret;
4272 }
4273
4274 sa.sa_handler = sighandler;
4275 sa.sa_mask = sigset;
4276 sa.sa_flags = 0;
4277 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4278 perror("sigaction");
4279 return ret;
4280 }
4281
4282 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4283 perror("sigaction");
4284 return ret;
4285 }
4286
4287 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4288 perror("sigaction");
4289 return ret;
4290 }
4291
4292 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4293
4294 return ret;
4295}
4296
4297/*
4298 * Set open files limit to unlimited. This daemon can open a large number of
4299 * file descriptors in order to consumer multiple kernel traces.
4300 */
4301static void set_ulimit(void)
4302{
4303 int ret;
4304 struct rlimit lim;
4305
4306 /* The kernel does not allowed an infinite limit for open files */
4307 lim.rlim_cur = 65535;
4308 lim.rlim_max = 65535;
4309
4310 ret = setrlimit(RLIMIT_NOFILE, &lim);
4311 if (ret < 0) {
4312 perror("failed to set open files limit");
4313 }
4314}
4315
4316/*
4317 * main
4318 */
4319int main(int argc, char **argv)
4320{
4321 int ret = 0;
4322 void *status;
4323 const char *home_path;
4324
4325 tracepoint(sessiond_boot_start);
4326 rcu_register_thread();
4327
4328 /* Create thread quit pipe */
4329 if ((ret = init_thread_quit_pipe()) < 0) {
4330 goto error;
4331 }
4332
4333 setup_consumerd_path();
4334
4335 /* Parse arguments */
4336 progname = argv[0];
4337 if ((ret = parse_args(argc, argv) < 0)) {
4338 goto error;
4339 }
4340
4341 /* Daemonize */
4342 if (opt_daemon) {
4343 ret = daemon(0, 0);
4344 if (ret < 0) {
4345 perror("daemon");
4346 goto error;
4347 }
4348 }
4349
4350 /* Check if daemon is UID = 0 */
4351 is_root = !getuid();
4352
4353 if (is_root) {
4354 rundir = strdup(LTTNG_RUNDIR);
4355
4356 /* Create global run dir with root access */
4357 ret = create_lttng_rundir(rundir);
4358 if (ret < 0) {
4359 goto error;
4360 }
4361
4362 if (strlen(apps_unix_sock_path) == 0) {
4363 snprintf(apps_unix_sock_path, PATH_MAX,
4364 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4365 }
4366
4367 if (strlen(client_unix_sock_path) == 0) {
4368 snprintf(client_unix_sock_path, PATH_MAX,
4369 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4370 }
4371
4372 /* Set global SHM for ust */
4373 if (strlen(wait_shm_path) == 0) {
4374 snprintf(wait_shm_path, PATH_MAX,
4375 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4376 }
4377
4378 /* Setup kernel consumerd path */
4379 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4380 KCONSUMERD_ERR_SOCK_PATH, rundir);
4381 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4382 KCONSUMERD_CMD_SOCK_PATH, rundir);
4383
4384 DBG2("Kernel consumer err path: %s",
4385 kconsumer_data.err_unix_sock_path);
4386 DBG2("Kernel consumer cmd path: %s",
4387 kconsumer_data.cmd_unix_sock_path);
4388 } else {
4389 home_path = get_home_dir();
4390 if (home_path == NULL) {
4391 /* TODO: Add --socket PATH option */
4392 ERR("Can't get HOME directory for sockets creation.");
4393 ret = -EPERM;
4394 goto error;
4395 }
4396
4397 /*
4398 * Create rundir from home path. This will create something like
4399 * $HOME/.lttng
4400 */
4401 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4402 if (ret < 0) {
4403 ret = -ENOMEM;
4404 goto error;
4405 }
4406
4407 ret = create_lttng_rundir(rundir);
4408 if (ret < 0) {
4409 goto error;
4410 }
4411
4412 if (strlen(apps_unix_sock_path) == 0) {
4413 snprintf(apps_unix_sock_path, PATH_MAX,
4414 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4415 }
4416
4417 /* Set the cli tool unix socket path */
4418 if (strlen(client_unix_sock_path) == 0) {
4419 snprintf(client_unix_sock_path, PATH_MAX,
4420 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4421 }
4422
4423 /* Set global SHM for ust */
4424 if (strlen(wait_shm_path) == 0) {
4425 snprintf(wait_shm_path, PATH_MAX,
4426 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4427 }
4428 }
4429
4430 DBG("Client socket path %s", client_unix_sock_path);
4431 DBG("Application socket path %s", apps_unix_sock_path);
4432 DBG("LTTng run directory path: %s", rundir);
4433
4434 /* 32 bits consumerd path setup */
4435 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4436 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4437 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4438 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4439
4440 DBG2("UST consumer 32 bits err path: %s",
4441 ustconsumer32_data.err_unix_sock_path);
4442 DBG2("UST consumer 32 bits cmd path: %s",
4443 ustconsumer32_data.cmd_unix_sock_path);
4444
4445 /* 64 bits consumerd path setup */
4446 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4447 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4448 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4449 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4450
4451 DBG2("UST consumer 64 bits err path: %s",
4452 ustconsumer64_data.err_unix_sock_path);
4453 DBG2("UST consumer 64 bits cmd path: %s",
4454 ustconsumer64_data.cmd_unix_sock_path);
4455
4456 /*
4457 * See if daemon already exist.
4458 */
4459 if ((ret = check_existing_daemon()) < 0) {
4460 ERR("Already running daemon.\n");
4461 /*
4462 * We do not goto exit because we must not cleanup()
4463 * because a daemon is already running.
4464 */
4465 goto error;
4466 }
4467
4468 /* After this point, we can safely call cleanup() with "goto exit" */
4469
4470 /*
4471 * These actions must be executed as root. We do that *after* setting up
4472 * the sockets path because we MUST make the check for another daemon using
4473 * those paths *before* trying to set the kernel consumer sockets and init
4474 * kernel tracer.
4475 */
4476 if (is_root) {
4477 ret = set_consumer_sockets(&kconsumer_data, rundir);
4478 if (ret < 0) {
4479 goto exit;
4480 }
4481
4482 /* Setup kernel tracer */
4483 if (!opt_no_kernel) {
4484 init_kernel_tracer();
4485 }
4486
4487 /* Set ulimit for open files */
4488 set_ulimit();
4489 }
4490
4491 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4492 if (ret < 0) {
4493 goto exit;
4494 }
4495
4496 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4497 if (ret < 0) {
4498 goto exit;
4499 }
4500
4501 if ((ret = set_signal_handler()) < 0) {
4502 goto exit;
4503 }
4504
4505 /* Setup the needed unix socket */
4506 if ((ret = init_daemon_socket()) < 0) {
4507 goto exit;
4508 }
4509
4510 /* Set credentials to socket */
4511 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4512 goto exit;
4513 }
4514
4515 /* Get parent pid if -S, --sig-parent is specified. */
4516 if (opt_sig_parent) {
4517 ppid = getppid();
4518 }
4519
4520 /* Setup the kernel pipe for waking up the kernel thread */
4521 if ((ret = create_kernel_poll_pipe()) < 0) {
4522 goto exit;
4523 }
4524
4525 /* Setup the thread apps communication pipe. */
4526 if ((ret = create_apps_cmd_pipe()) < 0) {
4527 goto exit;
4528 }
4529
4530 /* Init UST command queue. */
4531 cds_wfq_init(&ust_cmd_queue.queue);
4532
4533 /* Init UST app hash table */
4534 ust_app_ht_alloc();
4535
4536 /*
4537 * Get session list pointer. This pointer MUST NOT be free(). This list is
4538 * statically declared in session.c
4539 */
4540 session_list_ptr = session_get_list();
4541
4542 /* Set up max poll set size */
4543 lttng_poll_set_max_size();
4544
4545 /* Create thread to manage the client socket */
4546 ret = pthread_create(&client_thread, NULL,
4547 thread_manage_clients, (void *) NULL);
4548 if (ret != 0) {
4549 perror("pthread_create clients");
4550 goto exit_client;
4551 }
4552
4553 /* Create thread to dispatch registration */
4554 ret = pthread_create(&dispatch_thread, NULL,
4555 thread_dispatch_ust_registration, (void *) NULL);
4556 if (ret != 0) {
4557 perror("pthread_create dispatch");
4558 goto exit_dispatch;
4559 }
4560
4561 /* Create thread to manage application registration. */
4562 ret = pthread_create(&reg_apps_thread, NULL,
4563 thread_registration_apps, (void *) NULL);
4564 if (ret != 0) {
4565 perror("pthread_create registration");
4566 goto exit_reg_apps;
4567 }
4568
4569 /* Create thread to manage application socket */
4570 ret = pthread_create(&apps_thread, NULL,
4571 thread_manage_apps, (void *) NULL);
4572 if (ret != 0) {
4573 perror("pthread_create apps");
4574 goto exit_apps;
4575 }
4576
4577 /* Create kernel thread to manage kernel event */
4578 ret = pthread_create(&kernel_thread, NULL,
4579 thread_manage_kernel, (void *) NULL);
4580 if (ret != 0) {
4581 perror("pthread_create kernel");
4582 goto exit_kernel;
4583 }
4584
4585 tracepoint(sessiond_boot_end);
4586
4587 ret = pthread_join(kernel_thread, &status);
4588 if (ret != 0) {
4589 perror("pthread_join");
4590 goto error; /* join error, exit without cleanup */
4591 }
4592
4593exit_kernel:
4594 ret = pthread_join(apps_thread, &status);
4595 if (ret != 0) {
4596 perror("pthread_join");
4597 goto error; /* join error, exit without cleanup */
4598 }
4599
4600exit_apps:
4601 ret = pthread_join(reg_apps_thread, &status);
4602 if (ret != 0) {
4603 perror("pthread_join");
4604 goto error; /* join error, exit without cleanup */
4605 }
4606
4607exit_reg_apps:
4608 ret = pthread_join(dispatch_thread, &status);
4609 if (ret != 0) {
4610 perror("pthread_join");
4611 goto error; /* join error, exit without cleanup */
4612 }
4613
4614exit_dispatch:
4615 ret = pthread_join(client_thread, &status);
4616 if (ret != 0) {
4617 perror("pthread_join");
4618 goto error; /* join error, exit without cleanup */
4619 }
4620
4621 ret = join_consumer_thread(&kconsumer_data);
4622 if (ret != 0) {
4623 perror("join_consumer");
4624 goto error; /* join error, exit without cleanup */
4625 }
4626
4627exit_client:
4628exit:
4629 /*
4630 * cleanup() is called when no other thread is running.
4631 */
4632 rcu_thread_online();
4633 cleanup();
4634 rcu_thread_offline();
4635 rcu_unregister_thread();
4636 if (!ret) {
4637 exit(EXIT_SUCCESS);
4638 }
4639error:
4640 exit(EXIT_FAILURE);
4641}
LTTng 2.0 tools and control repository
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