projects / lttng-tools.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Add missing rcu read lock
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG		 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.
91d76f53 8 *
54d01ffb
DG		 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.
91d76f53 13 *
54d01ffb
DG		 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.
fac6795d
DG		 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>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG		 26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG		 33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG		 36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
4771f025 53#include "kernel.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
ebaeda94
MD		 60#define CONSUMERD_FILE "lttng-consumerd"
61
3bd1e081
MD		 62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
fac6795d 86/* Variables */
1d4b027a 87int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 88int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 89int opt_quiet; /* Not static for lttngerr.h */
d063d709 90
fac6795d
DG		 91const char *progname;
92const char *opt_tracing_group;
5b8719f5 93static int opt_sig_parent;
fac6795d
DG		 94static int opt_daemon;
95static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 96static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD		 97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD		 104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG		 117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG		 125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG		 130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG		 136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG		 150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG		 159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD		 171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
ebaeda94
MD		 174static const char *consumerd32_path =
175 __stringify(CONFIG_CONSUMERD32_PATH);
176static const char *consumerd64_path =
177 __stringify(CONFIG_CONSUMERD64_PATH);
178static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD		 182
183static
7753dea8 184void setup_consumerd_path(void)
fb09408a 185{
ebaeda94 186 const char *path, *libdir;
fb09408a 187
7753dea8
MD		 188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
7753dea8 192 */
ebaeda94
MD		 193#if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path[0]) {
7745933c 195 consumerd32_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200#elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path[0]) {
202 consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 203 }
ebaeda94
MD		 204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 206 }
207#else
208#error "Unknown bitness"
209#endif
210
fb09408a
MD		 211 /*
212 * runtime env. var. overrides the build default.
213 */
ebaeda94
MD		 214 path = getenv("LTTNG_CONSUMERD32_PATH");
215 if (path) {
216 consumerd32_path = path;
7753dea8 217 }
ebaeda94
MD		 218 path = getenv("LTTNG_CONSUMERD64_PATH");
219 if (path) {
220 consumerd64_path = path;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
fb09408a
MD		 229 }
230}
231
5eb91c98
DG		 232/*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237{
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258error:
259 return ret;
260}
261
262/*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267static int check_thread_quit_pipe(int fd, uint32_t events)
268{
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274}
275
0fdd1e2c
DG		 276/*
277 * Remove modules in reverse load order.
278 */
279static int modprobe_remove_kernel_modules(void)
280{
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 286 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 287 kernel_modules_list[i].name);
288 if (ret < 0) {
24b487b8 289 perror("snprintf modprobe -r");
0fdd1e2c
DG		 290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
24b487b8 295 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307error:
308 return ret;
309}
310
311/*
312 * Return group ID of the tracing group or -1 if not found.
313 */
996b65c8
MD		 314static gid_t allowed_group(void)
315{
316 struct group *grp;
317
274e143b
MD		 318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
996b65c8
MD		 323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328}
329
273ea72c 330/*
5eb91c98 331 * Init thread quit pipe.
273ea72c
DG		 332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335static int init_thread_quit_pipe(void)
336{
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345error:
346 return ret;
347}
348
fac6795d 349/*
d063d709
DG		 350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
fac6795d 352 */
1d4b027a 353static void teardown_kernel_session(struct ltt_session *session)
fac6795d 354{
8f7a84dd
DG		 355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
84ea9c99 357 return;
8f7a84dd
DG		 358 }
359
84ea9c99 360 DBG("Tearing down kernel session");
d9800920 361
84ea9c99
MD		 362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 368 }
84ea9c99
MD		 369
370 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 371}
372
f6a9efaa
DG		 373/*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377static void teardown_ust_session(struct ltt_session *session)
378{
84cd17c6
MD		 379 int ret;
380
8f7a84dd
DG		 381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
f470a390 383 return;
8f7a84dd
DG		 384 }
385
84ea9c99 386 DBG("Tearing down UST session(s)");
8f7a84dd 387
84cd17c6
MD		 388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
8f7a84dd 392
f6a9efaa
DG		 393 trace_ust_destroy_session(session->ust_session);
394}
395
099e26bd
DG		 396/*
397 * Stop all threads by closing the thread quit pipe.
398 */
cf3af59e
MD		 399static void stop_threads(void)
400{
5eb91c98
DG		 401 int ret;
402
cf3af59e
MD		 403 /* Stopping all threads */
404 DBG("Terminating all threads");
54d01ffb 405 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
099e26bd
DG		 410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 413}
414
fac6795d 415/*
d063d709 416 * Cleanup the daemon
fac6795d 417 */
cf3af59e 418static void cleanup(void)
fac6795d 419{
1d4b027a
DG		 420 int ret;
421 char *cmd;
af9737e9 422 struct ltt_session *sess, *stmp;
fac6795d 423
1d4b027a 424 DBG("Cleaning up");
e07ae692 425
5eb91c98
DG		 426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
5461b305 432
5eb91c98
DG		 433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
1d4b027a 438 }
5461b305 439
1d4b027a 440 DBG("Cleaning up all session");
fac6795d 441
b5541356 442 /* Destroy session list mutex */
273ea72c
DG		 443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
54d01ffb
DG		 447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
273ea72c 449 teardown_kernel_session(sess);
f6a9efaa
DG		 450 teardown_ust_session(sess);
451 free(sess);
273ea72c
DG		 452 }
453 }
454
099e26bd 455 DBG("Closing all UST sockets");
56fff090 456 ust_app_clean_list();
099e26bd 457
3bd1e081 458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 459
f3ed775e 460 DBG("Closing kernel fd");
1d4b027a 461 close(kernel_tracer_fd);
ab147185 462
2f50c8a3
DG		 463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
5eb91c98
DG		 467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
421cb601
DG		 470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
fac6795d
DG		 476}
477
e065084a 478/*
d063d709 479 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 480 *
d063d709 481 * Return lttcomm error code.
e065084a
DG		 482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
5461b305 493/*
d063d709 494 * Free memory of a command context structure.
5461b305 495 */
a2fb29a5 496static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 497{
a2fb29a5
DG		 498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
5461b305 502 }
a2fb29a5
DG		 503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
5461b305 505 }
a2fb29a5
DG		 506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
5461b305
DG		 508 }
509}
510
f3ed775e 511/*
d063d709 512 * Send all stream fds of kernel channel to the consumer.
f3ed775e 513 */
2bdd86d4 514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 515 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG		 516{
517 int ret;
f3ed775e 518 struct ltt_kernel_stream *stream;
3bd1e081 519 struct lttcomm_consumer_msg lkm;
f3ed775e 520
3bd1e081 521 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 522 channel->channel->name);
f3ed775e 523
3bd1e081
MD		 524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 531 if (ret < 0) {
3bd1e081 532 perror("send consumer channel");
f3ed775e
DG		 533 goto error;
534 }
535
3bd1e081 536 /* Send streams */
7a485870 537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
f3ed775e
DG		 559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG		 563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG		 575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD		 578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG		 580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 617 if (ret < 0) {
3bd1e081 618 perror("send consumer stream");
7a485870
DG		 619 goto error;
620 }
621 }
f3ed775e 622
f3ed775e 623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD		 624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
fac6795d 638/*
0fdd1e2c 639 * Notify UST applications using the shm mmap futex.
fac6795d 640 */
0fdd1e2c 641static int notify_ust_apps(int active)
fac6795d 642{
0fdd1e2c 643 char *wait_shm_mmap;
fac6795d 644
0fdd1e2c 645 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 646
0fdd1e2c
DG		 647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
fac6795d
DG		 650 goto error;
651 }
652
0fdd1e2c
DG		 653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
fac6795d
DG		 658
659error:
0fdd1e2c 660 return -1;
fac6795d
DG		 661}
662
e065084a 663/*
d063d709
DG		 664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
ca95a216 667 *
d063d709 668 * Return total size of the buffer pointed by buf.
ca95a216 669 */
5461b305 670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 671{
f3ed775e 672 int ret, buf_size;
ca95a216 673
f3ed775e 674 buf_size = size;
5461b305 675
ba7f0ae5 676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 677 if (cmd_ctx->llm == NULL) {
ba7f0ae5 678 perror("zmalloc");
5461b305 679 ret = -ENOMEM;
ca95a216
DG		 680 goto error;
681 }
682
5461b305
DG		 683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 686
5461b305
DG		 687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
ca95a216
DG		 690 return buf_size;
691
692error:
693 return ret;
694}
695
7a485870 696/*
5eb91c98 697 * Update the kernel poll set of all channel fd available over all tracing
d063d709 698 * session. Add the wakeup pipe at the end of the set.
7a485870 699 */
5eb91c98 700static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 701{
5eb91c98 702 int ret;
7a485870
DG		 703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
5eb91c98 706 DBG("Updating kernel poll set");
7a485870 707
54d01ffb 708 session_lock_list();
b5541356 709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 710 session_lock(session);
7a485870 711 if (session->kernel_session == NULL) {
54d01ffb 712 session_unlock(session);
7a485870
DG		 713 continue;
714 }
7a485870 715
54d01ffb
DG		 716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
54d01ffb 721 session_unlock(session);
5eb91c98
DG		 722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 725 }
54d01ffb 726 session_unlock(session);
7a485870 727 }
54d01ffb 728 session_unlock_list();
7a485870 729
5eb91c98 730 return 0;
7a485870
DG		 731
732error:
54d01ffb 733 session_unlock_list();
7a485870
DG		 734 return -1;
735}
736
737/*
54d01ffb 738 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 739 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 740 *
d063d709 741 * Useful for CPU hotplug feature.
7a485870 742 */
2bdd86d4 743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
54d01ffb 751 session_lock_list();
b5541356 752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 753 session_lock(session);
7a485870 754 if (session->kernel_session == NULL) {
54d01ffb 755 session_unlock(session);
7a485870
DG		 756 continue;
757 }
d9800920
DG		 758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 762 }
763
5eb91c98
DG		 764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
b3c750d2 770 goto error;
7a485870 771 }
d9800920 772
7a485870 773 /*
5eb91c98
DG		 774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
7a485870 777 */
3bd1e081 778 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 779 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 780 session->kernel_session->consumer_fd, channel);
7a485870 781 if (ret < 0) {
b3c750d2 782 goto error;
7a485870
DG		 783 }
784 }
b3c750d2 785 goto error;
7a485870
DG		 786 }
787 }
54d01ffb 788 session_unlock(session);
7a485870 789 }
54d01ffb 790 session_unlock_list();
b3c750d2 791 return ret;
7a485870 792
b3c750d2 793error:
54d01ffb
DG		 794 session_unlock(session);
795 session_unlock_list();
7a485870
DG		 796 return ret;
797}
798
487cf67c
DG		 799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
487cf67c
DG		 811 }
812}
813
7a485870 814/*
d063d709 815 * This thread manage event coming from the kernel.
7a485870 816 *
d063d709
DG		 817 * Features supported in this thread:
818 * -) CPU Hotplug
7a485870
DG		 819 */
820static void *thread_manage_kernel(void *data)
821{
5eb91c98
DG		 822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
7a485870 824 char tmp;
5eb91c98 825 struct lttng_poll_event events;
7a485870
DG		 826
827 DBG("Thread manage kernel started");
828
5eb91c98
DG		 829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
7a485870
DG		 839 while (1) {
840 if (update_poll_flag == 1) {
5f822d0a
DG		 841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
5eb91c98
DG		 847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
7a485870
DG		 849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
5eb91c98
DG		 854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
7a485870
DG		 860
861 /* Poll infinite value of time */
5eb91c98 862 ret = lttng_poll_wait(&events, -1);
7a485870 863 if (ret < 0) {
7a485870
DG		 864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
85611738
DG		 867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
7a485870
DG		 869 continue;
870 }
871
5eb91c98
DG		 872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 876
5eb91c98
DG		 877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
7a485870 882
5eb91c98
DG		 883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
2bdd86d4 894 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
7a485870 903 }
7a485870
DG		 904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
273ea72c
DG		 910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
5eb91c98
DG		 912
913 lttng_poll_clean(&events);
914
7a485870
DG		 915 return NULL;
916}
917
1d4b027a 918/*
3bd1e081 919 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 920 */
3bd1e081 921static void *thread_manage_consumer(void *data)
1d4b027a 922{
5eb91c98
DG		 923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
1d4b027a 925 enum lttcomm_return_code code;
5eb91c98 926 struct lttng_poll_event events;
3bd1e081 927 struct consumer_data *consumer_data = data;
1d4b027a 928
3bd1e081 929 DBG("[thread] Manage consumer started");
1d4b027a 930
3bd1e081 931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 932 if (ret < 0) {
933 goto error;
934 }
935
5eb91c98
DG		 936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
273ea72c 944
3bd1e081 945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 951
952 /* Inifinite blocking call, waiting for transmission */
5eb91c98 953 ret = lttng_poll_wait(&events, -1);
273ea72c 954 if (ret < 0) {
273ea72c
DG		 955 goto error;
956 }
957
5eb91c98
DG		 958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
3bd1e081 970 if (pollfd == consumer_data->err_sock) {
5eb91c98 971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 972 ERR("consumer err socket poll error");
5eb91c98
DG		 973 goto error;
974 }
975 }
273ea72c
DG		 976 }
977
3bd1e081 978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 979 if (sock < 0) {
980 goto error;
981 }
982
3bd1e081 983 DBG2("Receiving code from consumer err_sock");
ee0b0061 984
712ea556 985 /* Getting status code from kconsumerd */
54d01ffb
DG		 986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 988 if (ret <= 0) {
989 goto error;
990 }
991
3bd1e081
MD		 992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
48842b30 997 PERROR("consumer connect");
1d4b027a
DG		 998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1d4b027a 1003 } else {
3bd1e081 1004 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
54d01ffb 1009 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1011 if (ret < 0) {
72079cae
DG		 1012 goto error;
1013 }
1014
5eb91c98
DG		 1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
72079cae 1017 goto error;
5eb91c98
DG		 1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
72079cae
DG		 1026 goto error;
1027 }
1028
5eb91c98
DG		 1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1043 ERR("consumer err socket second poll error");
5eb91c98
DG		 1044 goto error;
1045 }
1046 }
1047 }
1048
712ea556 1049 /* Wait for any kconsumerd error */
54d01ffb
DG		 1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
712ea556 1052 if (ret <= 0) {
3bd1e081 1053 ERR("consumer closed the command socket");
712ea556 1054 goto error;
6f61d021 1055 }
1d4b027a 1056
3bd1e081 1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1058
1d4b027a 1059error:
3bd1e081
MD		 1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
5eb91c98 1063 close(sock);
273ea72c 1064
3bd1e081
MD		 1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1d4b027a 1068
5eb91c98 1069 lttng_poll_clean(&events);
0177d773 1070
5eb91c98 1071 return NULL;
099e26bd
DG		 1072}
1073
099e26bd
DG		 1074/*
1075 * This thread manage application communication.
1d4b027a
DG		 1076 */
1077static void *thread_manage_apps(void *data)
099e26bd 1078{
5eb91c98
DG		 1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
099e26bd 1081 struct ust_command ust_cmd;
5eb91c98 1082 struct lttng_poll_event events;
099e26bd
DG		 1083
1084 DBG("[thread] Manage application started");
1085
f6a9efaa
DG		 1086 rcu_register_thread();
1087 rcu_thread_online();
1088
5eb91c98
DG		 1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG		 1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
099e26bd 1098
5eb91c98
DG		 1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
0177d773 1102
5eb91c98 1103 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1108 ret = lttng_poll_wait(&events, -1);
099e26bd 1109 if (ret < 0) {
099e26bd
DG		 1110 goto error;
1111 }
1112
5eb91c98
DG		 1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
099e26bd 1121 goto error;
5eb91c98 1122 }
099e26bd 1123
5eb91c98
DG		 1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
0177d773 1128 goto error;
5eb91c98
DG		 1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
099e26bd 1136
5eb91c98 1137 /* Register applicaton to the session daemon */
56fff090 1138 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1139 ust_cmd.sock);
88ff5b7f 1140 if (ret == -ENOMEM) {
5eb91c98 1141 goto error;
88ff5b7f
MD		 1142 } else if (ret < 0) {
1143 break;
5eb91c98
DG		 1144 }
1145
acc7b41b
MD		 1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
5eb91c98
DG		 1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
56fff090 1158 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
54d01ffb
DG		 1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
5eb91c98 1171 }
487cf67c 1172
5eb91c98 1173 break;
0177d773 1174 }
5eb91c98
DG		 1175 } else {
1176 /*
54d01ffb
DG		 1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
5eb91c98
DG		 1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
099e26bd 1186
b9d9b220 1187 /* Socket closed on remote end. */
56fff090 1188 ust_app_unregister(pollfd);
5eb91c98
DG		 1189 break;
1190 }
099e26bd
DG		 1191 }
1192 }
099e26bd
DG		 1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
5eb91c98 1200 lttng_poll_clean(&events);
099e26bd 1201
f6a9efaa
DG		 1202 rcu_thread_offline();
1203 rcu_unregister_thread();
099e26bd
DG		 1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
00a17c97 1227 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
2f50c8a3
DG		 1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1d4b027a 1275{
5eb91c98
DG		 1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
099e26bd
DG		 1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1d4b027a 1284
099e26bd 1285 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
5eb91c98
DG		 1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
273ea72c 1300
5eb91c98
DG		 1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
273ea72c 1306
1d4b027a 1307 /* Notify all applications to register */
0fdd1e2c
DG		 1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
0fdd1e2c 1313 }
1d4b027a
DG		 1314
1315 while (1) {
1316 DBG("Accepting application registration");
273ea72c 1317
5eb91c98
DG		 1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
273ea72c 1320 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1321 ret = lttng_poll_wait(&events, -1);
273ea72c 1322 if (ret < 0) {
273ea72c
DG		 1323 goto error;
1324 }
1325
5eb91c98
DG		 1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1330
5eb91c98
DG		 1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
90014c57
DG		 1334 goto error;
1335 }
1d4b027a 1336
5eb91c98
DG		 1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
099e26bd 1347
5eb91c98 1348 /* Create UST registration command for enqueuing */
ba7f0ae5 1349 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1350 if (ust_cmd == NULL) {
ba7f0ae5 1351 perror("ust command zmalloc");
5eb91c98
DG		 1352 goto error;
1353 }
1d4b027a 1354
5eb91c98
DG		 1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
099e26bd 1371
5eb91c98 1372 ust_cmd->sock = sock;
099e26bd 1373
5eb91c98
DG		 1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1380
5eb91c98
DG		 1381 /*
1382 * Lock free enqueue the registration request. The red pill
54d01ffb 1383 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
90014c57 1394 }
1d4b027a
DG		 1395 }
1396
1397error:
0fdd1e2c
DG		 1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
273ea72c 1405 unlink(apps_unix_sock_path);
0fdd1e2c 1406
5eb91c98
DG		 1407 lttng_poll_clean(&events);
1408
1d4b027a
DG		 1409 return NULL;
1410}
1411
8c0faa1d 1412/*
3bd1e081 1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1414 * exec or it will fails.
8c0faa1d 1415 */
3bd1e081 1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1417{
1418 int ret;
ee0b0061
DG		 1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
8c0faa1d
DG		 1423
1424 /* Setup semaphore */
3bd1e081 1425 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1426 if (ret < 0) {
3bd1e081 1427 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1428 goto error;
1429 }
8c0faa1d 1430
3bd1e081
MD		 1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
8c0faa1d 1433 if (ret != 0) {
3bd1e081 1434 PERROR("pthread_create consumer");
ee0b0061 1435 ret = -1;
8c0faa1d
DG		 1436 goto error;
1437 }
1438
ee0b0061
DG		 1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
3bd1e081 1442 PERROR("clock_gettime spawn consumer");
ee0b0061 1443 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1444 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1449 }
8c0faa1d 1450
ee0b0061
DG		 1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
3bd1e081
MD		 1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1459 if (ret < 0) {
3bd1e081 1460 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1461 }
1462 } else {
3bd1e081 1463 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1464 }
1465 goto error;
1466 }
1467
3bd1e081
MD		 1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
712ea556 1470 ERR("Kconsumerd did not start");
3bd1e081 1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1472 goto error;
1473 }
3bd1e081 1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1475
8c0faa1d
DG		 1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
d9800920 1482/*
3bd1e081 1483 * Join consumer thread
d9800920 1484 */
3bd1e081 1485static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1486{
1487 void *status;
1488 int ret;
1489
3bd1e081
MD		 1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1492 if (ret) {
3bd1e081 1493 ERR("Error killing consumer daemon");
cf3af59e
MD		 1494 return ret;
1495 }
3bd1e081 1496 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1497 } else {
1498 return 0;
1499 }
1500}
1501
8c0faa1d 1502/*
3bd1e081 1503 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1504 *
d063d709 1505 * Return pid if successful else -1.
8c0faa1d 1506 */
3bd1e081 1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1508{
1509 int ret;
1510 pid_t pid;
53086306 1511 const char *verbosity;
8c0faa1d 1512
3bd1e081 1513 DBG("Spawning consumerd");
c49dc785 1514
8c0faa1d
DG		 1515 pid = fork();
1516 if (pid == 0) {
1517 /*
3bd1e081 1518 * Exec consumerd.
8c0faa1d 1519 */
3bd1e081 1520 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG		 1521 verbosity = "--verbose";
1522 } else {
1523 verbosity = "--quiet";
1524 }
3bd1e081
MD		 1525 switch (consumer_data->type) {
1526 case LTTNG_CONSUMER_KERNEL:
1527 execl(INSTALL_BIN_PATH "/lttng-consumerd",
7753dea8
MD		 1528 "lttng-consumerd", verbosity, "-k",
1529 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1530 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1531 NULL);
3bd1e081 1532 break;
7753dea8
MD		 1533 case LTTNG_CONSUMER64_UST:
1534 {
b1e0b6b6 1535 char *tmpnew = NULL;
8f4905da
MD		 1536
1537 if (consumerd64_libdir[0] != '\0') {
1538 char *tmp;
1539 size_t tmplen;
1540
1541 tmp = getenv("LD_LIBRARY_PATH");
1542 if (!tmp) {
1543 tmp = "";
1544 }
1545 tmplen = strlen("LD_LIBRARY_PATH=")
1546 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1547 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1548 if (!tmpnew) {
1549 ret = -ENOMEM;
1550 goto error;
1551 }
1552 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1553 strcat(tmpnew, consumerd64_libdir);
1554 if (tmp[0] != '\0') {
1555 strcat(tmpnew, ":");
1556 strcat(tmpnew, tmp);
1557 }
1558 ret = putenv(tmpnew);
1559 if (ret) {
1560 ret = -errno;
1561 goto error;
1562 }
1563 }
1564 ret = execl(consumerd64_path, verbosity, "-u",
7753dea8
MD		 1565 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1566 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1567 NULL);
8f4905da
MD		 1568 if (consumerd64_libdir[0] != '\0') {
1569 free(tmpnew);
1570 }
1571 if (ret) {
1572 goto error;
1573 }
3bd1e081 1574 break;
7753dea8
MD		 1575 }
1576 case LTTNG_CONSUMER32_UST:
1577 {
937dde8e 1578 char *tmpnew = NULL;
8f4905da
MD		 1579
1580 if (consumerd32_libdir[0] != '\0') {
1581 char *tmp;
1582 size_t tmplen;
1583
1584 tmp = getenv("LD_LIBRARY_PATH");
1585 if (!tmp) {
1586 tmp = "";
1587 }
1588 tmplen = strlen("LD_LIBRARY_PATH=")
1589 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1590 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1591 if (!tmpnew) {
1592 ret = -ENOMEM;
1593 goto error;
1594 }
1595 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1596 strcat(tmpnew, consumerd32_libdir);
1597 if (tmp[0] != '\0') {
1598 strcat(tmpnew, ":");
1599 strcat(tmpnew, tmp);
1600 }
1601 ret = putenv(tmpnew);
1602 if (ret) {
1603 ret = -errno;
1604 goto error;
1605 }
1606 }
1607 ret = execl(consumerd32_path, verbosity, "-u",
7753dea8
MD		 1608 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1609 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1610 NULL);
8f4905da
MD		 1611 if (consumerd32_libdir[0] != '\0') {
1612 free(tmpnew);
1613 }
1614 if (ret) {
1615 goto error;
1616 }
7753dea8
MD		 1617 break;
1618 }
3bd1e081
MD		 1619 default:
1620 perror("unknown consumer type");
1621 exit(EXIT_FAILURE);
1622 }
8c0faa1d
DG		 1623 if (errno != 0) {
1624 perror("kernel start consumer exec");
1625 }
1626 exit(EXIT_FAILURE);
1627 } else if (pid > 0) {
1628 ret = pid;
8c0faa1d 1629 } else {
3bd1e081 1630 perror("start consumer fork");
8c0faa1d 1631 ret = -errno;
8c0faa1d 1632 }
8f4905da 1633error:
8c0faa1d
DG		 1634 return ret;
1635}
1636
693bd40b 1637/*
3bd1e081 1638 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1639 */
3bd1e081 1640static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1641{
1642 int ret;
1643
3bd1e081
MD		 1644 pthread_mutex_lock(&consumer_data->pid_mutex);
1645 if (consumer_data->pid != 0) {
1646 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1647 goto end;
1648 }
693bd40b 1649
3bd1e081 1650 ret = spawn_consumerd(consumer_data);
c49dc785 1651 if (ret < 0) {
3bd1e081
MD		 1652 ERR("Spawning consumerd failed");
1653 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1654 goto error;
693bd40b 1655 }
c49dc785 1656
3bd1e081
MD		 1657 /* Setting up the consumer_data pid */
1658 consumer_data->pid = ret;
48842b30 1659 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1660 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1661
3bd1e081
MD		 1662 DBG2("Spawning consumer control thread");
1663 ret = spawn_consumer_thread(consumer_data);
693bd40b 1664 if (ret < 0) {
3bd1e081 1665 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1666 goto error;
1667 }
1668
c49dc785 1669end:
693bd40b
DG		 1670 return 0;
1671
1672error:
1673 return ret;
1674}
1675
b73401da 1676/*
d063d709 1677 * modprobe_kernel_modules
b73401da
DG		 1678 */
1679static int modprobe_kernel_modules(void)
1680{
ab147185 1681 int ret = 0, i;
b73401da
DG		 1682 char modprobe[256];
1683
ab147185
MD		 1684 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1685 ret = snprintf(modprobe, sizeof(modprobe),
1686 "/sbin/modprobe %s%s",
24b487b8 1687 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1688 kernel_modules_list[i].name);
b73401da
DG		 1689 if (ret < 0) {
1690 perror("snprintf modprobe");
1691 goto error;
1692 }
ab147185 1693 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1694 ret = system(modprobe);
ab147185
MD		 1695 if (ret == -1) {
1696 ERR("Unable to launch modprobe for module %s",
1697 kernel_modules_list[i].name);
1698 } else if (kernel_modules_list[i].required
d9800920 1699 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1700 ERR("Unable to load module %s",
1701 kernel_modules_list[i].name);
1702 } else {
1703 DBG("Modprobe successfully %s",
1704 kernel_modules_list[i].name);
1705 }
1706 }
1707
1708error:
1709 return ret;
1710}
1711
b73401da 1712/*
d063d709 1713 * mount_debugfs
b73401da
DG		 1714 */
1715static int mount_debugfs(char *path)
1716{
1717 int ret;
1718 char *type = "debugfs";
1719
996b65c8 1720 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1721 if (ret < 0) {
7272acf5 1722 PERROR("Cannot create debugfs path");
b73401da
DG		 1723 goto error;
1724 }
1725
1726 ret = mount(type, path, type, 0, NULL);
1727 if (ret < 0) {
7272acf5 1728 PERROR("Cannot mount debugfs");
b73401da
DG		 1729 goto error;
1730 }
1731
1732 DBG("Mounted debugfs successfully at %s", path);
1733
1734error:
1735 return ret;
1736}
1737
8c0faa1d 1738/*
d063d709 1739 * Setup necessary data for kernel tracer action.
8c0faa1d 1740 */
f3ed775e 1741static void init_kernel_tracer(void)
8c0faa1d 1742{
b73401da
DG		 1743 int ret;
1744 char *proc_mounts = "/proc/mounts";
1745 char line[256];
684d34d2 1746 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1747 FILE *fp;
1748
1749 /* Detect debugfs */
1750 fp = fopen(proc_mounts, "r");
1751 if (fp == NULL) {
1752 ERR("Unable to probe %s", proc_mounts);
1753 goto error;
1754 }
1755
1756 while (fgets(line, sizeof(line), fp) != NULL) {
1757 if (strstr(line, "debugfs") != NULL) {
1758 /* Remove first string */
1759 strtok(line, " ");
1760 /* Dup string here so we can reuse line later on */
1761 debugfs_path = strdup(strtok(NULL, " "));
1762 DBG("Got debugfs path : %s", debugfs_path);
1763 break;
1764 }
1765 }
1766
1767 fclose(fp);
1768
1769 /* Mount debugfs if needded */
1770 if (debugfs_path == NULL) {
1771 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1772 if (ret < 0) {
1773 perror("asprintf debugfs path");
1774 goto error;
1775 }
1776 ret = mount_debugfs(debugfs_path);
1777 if (ret < 0) {
7272acf5 1778 perror("Cannot mount debugfs");
b73401da
DG		 1779 goto error;
1780 }
1781 }
1782
1783 /* Modprobe lttng kernel modules */
1784 ret = modprobe_kernel_modules();
1785 if (ret < 0) {
1786 goto error;
1787 }
1788
1789 /* Setup lttng kernel path */
1790 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1791 if (ret < 0) {
1792 perror("asprintf lttng path");
1793 goto error;
1794 }
1795
1796 /* Open debugfs lttng */
1797 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1798 if (kernel_tracer_fd < 0) {
b73401da
DG		 1799 DBG("Failed to open %s", lttng_path);
1800 goto error;
8c0faa1d
DG		 1801 }
1802
b73401da
DG		 1803 free(lttng_path);
1804 free(debugfs_path);
f3ed775e 1805 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1806 return;
1807
1808error:
1809 if (lttng_path) {
1810 free(lttng_path);
1811 }
1812 if (debugfs_path) {
1813 free(debugfs_path);
1814 }
1815 WARN("No kernel tracer available");
1816 kernel_tracer_fd = 0;
1817 return;
f3ed775e 1818}
33a2b854 1819
f3ed775e 1820/*
54d01ffb 1821 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1822 */
54d01ffb 1823static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1824{
f40799e8 1825 int ret = 0;
8c0faa1d 1826
3bd1e081 1827 if (session->consumer_fds_sent == 0) {
d9800920 1828 /*
54d01ffb
DG		 1829 * Assign default kernel consumer socket if no consumer assigned to the
1830 * kernel session. At this point, it's NOT suppose to be 0 but this is
1831 * an extra security check.
d9800920
DG		 1832 */
1833 if (session->consumer_fd == 0) {
3bd1e081 1834 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1835 }
1836
2bdd86d4 1837 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1838 if (ret < 0) {
f3ed775e
DG		 1839 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1840 goto error;
1841 }
1d4b027a 1842
3bd1e081 1843 session->consumer_fds_sent = 1;
f3ed775e 1844 }
1d4b027a
DG		 1845
1846error:
1847 return ret;
8c0faa1d
DG		 1848}
1849
0177d773
DG		 1850/*
1851 * Create an UST session and add it to the session ust list.
1852 */
44d3bd01
DG		 1853static int create_ust_session(struct ltt_session *session,
1854 struct lttng_domain *domain)
0177d773 1855{
44d3bd01 1856 int ret;
48842b30 1857 unsigned int uid;
13384287 1858 struct ltt_ust_session *lus = NULL;
44d3bd01
DG		 1859
1860 switch (domain->type) {
48842b30 1861 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1862 break;
1863 default:
13384287 1864 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1865 goto error;
1866 }
0177d773
DG		 1867
1868 DBG("Creating UST session");
1869
44e96653 1870 uid = session->uid;
48842b30 1871 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1872 if (lus == NULL) {
44d3bd01 1873 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1874 goto error;
1875 }
1876
48842b30 1877 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG		 1878 geteuid(), allowed_group());
1879 if (ret < 0) {
1880 if (ret != -EEXIST) {
1881 ERR("Trace directory creation error");
44d3bd01 1882 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1883 goto error;
1884 }
1885 }
1886
f6a9efaa
DG		 1887 /* The domain type dictate different actions on session creation */
1888 switch (domain->type) {
48842b30
DG		 1889 case LTTNG_DOMAIN_UST:
1890 /* No ustctl for the global UST domain */
1891 break;
1892 default:
36dc12cc 1893 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1894 goto error;
0177d773 1895 }
f6a9efaa 1896 session->ust_session = lus;
44d3bd01
DG		 1897
1898 return LTTCOMM_OK;
0177d773
DG		 1899
1900error:
1901 free(lus);
1902 return ret;
1903}
1904
333f285e 1905/*
d063d709 1906 * Create a kernel tracer session then create the default channel.
333f285e 1907 */
f3ed775e 1908static int create_kernel_session(struct ltt_session *session)
333f285e 1909{
f3ed775e 1910 int ret;
f3ed775e
DG		 1911
1912 DBG("Creating kernel session");
1913
1914 ret = kernel_create_session(session, kernel_tracer_fd);
1915 if (ret < 0) {
1916 ret = LTTCOMM_KERN_SESS_FAIL;
1917 goto error;
333f285e
DG		 1918 }
1919
d9800920 1920 /* Set kernel consumer socket fd */
3bd1e081
MD		 1921 if (kconsumer_data.cmd_sock) {
1922 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1923 }
1924
63053e7c
DG		 1925 ret = mkdir_recursive(session->kernel_session->trace_path,
1926 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1927 if (ret < 0) {
996b65c8 1928 if (ret != -EEXIST) {
7a485870
DG		 1929 ERR("Trace directory creation error");
1930 goto error;
1931 }
1932 }
1933
f3ed775e
DG		 1934error:
1935 return ret;
333f285e
DG		 1936}
1937
6c9cc2ab
DG		 1938/*
1939 * Using the session list, filled a lttng_session array to send back to the
1940 * client for session listing.
1941 *
1942 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1943 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1944 */
1945static void list_lttng_sessions(struct lttng_session *sessions)
1946{
1947 int i = 0;
1948 struct ltt_session *session;
1949
1950 DBG("Getting all available session");
1951 /*
1952 * Iterate over session list and append data after the control struct in
1953 * the buffer.
1954 */
1955 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1956 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1957 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1958 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1959 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1960 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1961 i++;
1962 }
1963}
1964
9f19cc17
DG		 1965/*
1966 * Fill lttng_channel array of all channels.
1967 */
b551a063 1968static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1969 struct lttng_channel *channels)
1970{
1971 int i = 0;
1972 struct ltt_kernel_channel *kchan;
1973
1974 DBG("Listing channels for session %s", session->name);
1975
b551a063
DG		 1976 switch (domain) {
1977 case LTTNG_DOMAIN_KERNEL:
1978 /* Kernel channels */
1979 if (session->kernel_session != NULL) {
1980 cds_list_for_each_entry(kchan,
1981 &session->kernel_session->channel_list.head, list) {
1982 /* Copy lttng_channel struct to array */
1983 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1984 channels[i].enabled = kchan->enabled;
1985 i++;
1986 }
1987 }
1988 break;
1989 case LTTNG_DOMAIN_UST:
1990 {
1991 struct cds_lfht_iter iter;
1992 struct ltt_ust_channel *uchan;
1993
1994 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1995 &iter, uchan, node) {
1996 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1997 channels[i].attr.overwrite = uchan->attr.overwrite;
1998 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1999 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2000 channels[i].attr.switch_timer_interval =
2001 uchan->attr.switch_timer_interval;
2002 channels[i].attr.read_timer_interval =
2003 uchan->attr.read_timer_interval;
aea829b3 2004 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2005 switch (uchan->attr.output) {
2006 case LTTNG_UST_MMAP:
2007 default:
2008 channels[i].attr.output = LTTNG_EVENT_MMAP;
2009 break;
2010 }
befe0905 2011 i++;
b551a063
DG		 2012 }
2013 break;
2014 }
2015 default:
2016 break;
2017 }
2018}
2019
2020/*
2021 * Create a list of ust global domain events.
2022 */
2023static int list_lttng_ust_global_events(char *channel_name,
2024 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2025{
2026 int i = 0, ret = 0;
2027 unsigned int nb_event = 0;
2028 struct cds_lfht_iter iter;
d7b75b30 2029 struct cds_lfht_node *node;
b551a063
DG		 2030 struct ltt_ust_channel *uchan;
2031 struct ltt_ust_event *uevent;
2032 struct lttng_event *tmp;
2033
2034 DBG("Listing UST global events for channel %s", channel_name);
2035
2036 rcu_read_lock();
2037
d7b75b30
DG		 2038 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2039 strlen(channel_name), &iter);
2040 if (node == NULL) {
2041 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2042 goto error;
b551a063
DG		 2043 }
2044
d7b75b30
DG		 2045 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2046
2047 nb_event += hashtable_get_count(uchan->events);
2048
b551a063
DG		 2049 if (nb_event == 0) {
2050 ret = nb_event;
2051 goto error;
2052 }
2053
2054 DBG3("Listing UST global %d events", nb_event);
2055
2056 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2057 if (tmp == NULL) {
2058 ret = -LTTCOMM_FATAL;
2059 goto error;
2060 }
2061
d7b75b30
DG		 2062 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2063 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2064 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2065 tmp[i].enabled = uevent->enabled;
2066 switch (uevent->attr.instrumentation) {
2067 case LTTNG_UST_TRACEPOINT:
2068 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2069 break;
2070 case LTTNG_UST_PROBE:
2071 tmp[i].type = LTTNG_EVENT_PROBE;
2072 break;
2073 case LTTNG_UST_FUNCTION:
2074 tmp[i].type = LTTNG_EVENT_FUNCTION;
2075 break;
9f19cc17 2076 }
d7b75b30 2077 i++;
9f19cc17
DG		 2078 }
2079
b551a063
DG		 2080 ret = nb_event;
2081 *events = tmp;
2082
2083error:
2084 rcu_read_unlock();
2085 return ret;
9f19cc17
DG		 2086}
2087
2088/*
b551a063 2089 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2090 */
b551a063
DG		 2091static int list_lttng_kernel_events(char *channel_name,
2092 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2093{
b551a063
DG		 2094 int i = 0, ret;
2095 unsigned int nb_event;
9f19cc17 2096 struct ltt_kernel_event *event;
b551a063
DG		 2097 struct ltt_kernel_channel *kchan;
2098
2099 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2100 if (kchan == NULL) {
2101 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2102 goto error;
2103 }
2104
2105 nb_event = kchan->event_count;
9f19cc17
DG		 2106
2107 DBG("Listing events for channel %s", kchan->channel->name);
2108
b551a063
DG		 2109 if (nb_event == 0) {
2110 ret = nb_event;
2111 goto error;
2112 }
2113
2114 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2115 if (*events == NULL) {
2116 ret = LTTCOMM_FATAL;
2117 goto error;
2118 }
2119
9f19cc17
DG		 2120 /* Kernel channels */
2121 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2122 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2123 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2124 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2125 switch (event->event->instrumentation) {
2126 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2127 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2128 break;
2129 case LTTNG_KERNEL_KPROBE:
2130 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2131 (*events)[i].type = LTTNG_EVENT_PROBE;
2132 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2133 sizeof(struct lttng_kernel_kprobe));
2134 break;
2135 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2136 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2137 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2138 sizeof(struct lttng_kernel_function));
2139 break;
0133c199 2140 case LTTNG_KERNEL_NOOP:
b551a063 2141 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2142 break;
a54bd42d 2143 case LTTNG_KERNEL_SYSCALL:
b551a063 2144 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2145 break;
7a3d1328
MD		 2146 case LTTNG_KERNEL_ALL:
2147 assert(0);
2148 break;
9f19cc17
DG		 2149 }
2150 i++;
2151 }
b551a063
DG		 2152
2153 return nb_event;
2154
2155error:
2156 return ret;
9f19cc17
DG		 2157}
2158
fac6795d 2159/*
54d01ffb 2160 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2161 */
54d01ffb
DG		 2162static int cmd_disable_channel(struct ltt_session *session,
2163 int domain, char *channel_name)
fac6795d 2164{
54d01ffb 2165 int ret;
78f0bacd
DG		 2166 struct ltt_ust_session *usess;
2167
2168 usess = session->ust_session;
379473d2 2169
54d01ffb 2170 switch (domain) {
78f0bacd
DG		 2171 case LTTNG_DOMAIN_KERNEL:
2172 {
2173 ret = channel_kernel_disable(session->kernel_session,
2174 channel_name);
2175 if (ret != LTTCOMM_OK) {
2176 goto error;
2177 }
54d01ffb 2178
78f0bacd
DG		 2179 kernel_wait_quiescent(kernel_tracer_fd);
2180 break;
2181 }
2182 case LTTNG_DOMAIN_UST:
2183 {
2184 struct ltt_ust_channel *uchan;
2185
2186 /* Get channel in global UST domain HT */
2187 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2188 channel_name);
2189 if (uchan == NULL) {
2190 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2191 goto error;
78f0bacd
DG		 2192 }
2193
8535a6d9
DG		 2194 /* Already disabled */
2195 if (!uchan->enabled) {
2196 DBG2("UST channel %s already disabled", channel_name);
2197 break;
2198 }
2199
35a9059d 2200 ret = ust_app_disable_channel_glb(usess, uchan);
78f0bacd
DG		 2201 if (ret < 0) {
2202 ret = LTTCOMM_UST_DISABLE_FAIL;
2203 goto error;
2204 }
2205
2206 uchan->enabled = 0;
2207
2208 break;
2209 }
2210 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2211 case LTTNG_DOMAIN_UST_EXEC_NAME:
2212 case LTTNG_DOMAIN_UST_PID:
2213 ret = LTTCOMM_NOT_IMPLEMENTED;
2214 goto error;
2215 default:
2216 ret = LTTCOMM_UNKNOWN_DOMAIN;
2217 goto error;
20fe2104
DG		 2218 }
2219
54d01ffb 2220 ret = LTTCOMM_OK;
d65106b1 2221
54d01ffb
DG		 2222error:
2223 return ret;
2224}
2225
56fff090
DG		 2226/*
2227 * Copy channel from attributes and set it in the application channel list.
2228 */
f6a9efaa 2229/*
56fff090
DG		 2230static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2231 struct lttng_channel *attr, struct ust_app *app)
2232{
2233 int ret;
2234 struct ltt_ust_channel *uchan, *new_chan;
2235
f6a9efaa 2236 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG		 2237 if (uchan == NULL) {
2238 ret = LTTCOMM_FATAL;
2239 goto error;
2240 }
2241
2242 new_chan = trace_ust_create_channel(attr, usess->path);
2243 if (new_chan == NULL) {
2244 PERROR("malloc ltt_ust_channel");
2245 ret = LTTCOMM_FATAL;
2246 goto error;
2247 }
2248
2249 ret = channel_ust_copy(new_chan, uchan);
2250 if (ret < 0) {
2251 ret = LTTCOMM_FATAL;
2252 goto error;
2253 }
2254
56fff090
DG		 2255error:
2256 return ret;
2257}
f6a9efaa 2258*/
56fff090 2259
54d01ffb
DG		 2260/*
2261 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2262 */
44d3bd01 2263static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2264 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2265{
2266 int ret;
f6a9efaa
DG		 2267 struct ltt_ust_session *usess = session->ust_session;
2268
5d56b5aa 2269 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2270
aea829b3 2271 switch (domain) {
44d3bd01
DG		 2272 case LTTNG_DOMAIN_KERNEL:
2273 {
2274 struct ltt_kernel_channel *kchan;
54d01ffb 2275
44d3bd01
DG		 2276 kchan = trace_kernel_get_channel_by_name(attr->name,
2277 session->kernel_session);
2278 if (kchan == NULL) {
2279 ret = channel_kernel_create(session->kernel_session,
2280 attr, kernel_poll_pipe[1]);
2281 } else {
2282 ret = channel_kernel_enable(session->kernel_session, kchan);
2283 }
2284
2285 if (ret != LTTCOMM_OK) {
2286 goto error;
2287 }
2288
2289 kernel_wait_quiescent(kernel_tracer_fd);
2290 break;
2291 }
f6a9efaa
DG		 2292 case LTTNG_DOMAIN_UST:
2293 {
2294 struct ltt_ust_channel *uchan;
2295
48842b30 2296 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2297
48842b30 2298 /* Get channel in global UST domain HT */
f6a9efaa
DG		 2299 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2300 attr->name);
2301 if (uchan == NULL) {
48842b30 2302 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG		 2303 if (uchan == NULL) {
2304 ret = LTTCOMM_UST_CHAN_FAIL;
2305 goto error;
2306 }
d5cd1f34 2307
78f0bacd 2308 /* Add channel to all registered applications */
35a9059d 2309 ret = ust_app_create_channel_glb(usess, uchan);
78f0bacd
DG		 2310 if (ret != 0) {
2311 ret = LTTCOMM_UST_CHAN_FAIL;
2312 goto error;
2313 }
8535a6d9
DG		 2314
2315 rcu_read_lock();
2316 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2317 rcu_read_unlock();
2318
2319 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa 2320 } else {
78f0bacd
DG		 2321 /* If already enabled, everything is OK */
2322 if (uchan->enabled) {
8535a6d9 2323 break;
78f0bacd 2324 }
f6a9efaa 2325
35a9059d 2326 ret = ust_app_enable_channel_glb(usess, uchan);
78f0bacd 2327 if (ret < 0) {
8535a6d9
DG		 2328 if (ret != -EEXIST) {
2329 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2330 goto error;
2331 } else {
2332 ret = LTTCOMM_OK;
2333 }
78f0bacd 2334 }
48842b30 2335 }
f6a9efaa 2336
37357452
DG		 2337 uchan->enabled = 1;
2338
f6a9efaa
DG		 2339 break;
2340 }
78f0bacd
DG		 2341 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2342 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2343 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2344 ret = LTTCOMM_NOT_IMPLEMENTED;
2345 goto error;
44d3bd01
DG		 2346 default:
2347 ret = LTTCOMM_UNKNOWN_DOMAIN;
2348 goto error;
54d01ffb
DG		 2349 }
2350
2351 ret = LTTCOMM_OK;
2352
2353error:
2354 return ret;
2355}
2356
2357/*
2358 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2359 */
2360static int cmd_disable_event(struct ltt_session *session, int domain,
2361 char *channel_name, char *event_name)
2362{
2363 int ret;
54d01ffb
DG		 2364
2365 switch (domain) {
2366 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2367 {
2368 struct ltt_kernel_channel *kchan;
b0a40d28 2369 struct ltt_kernel_session *ksess;
2bdd86d4 2370
b0a40d28
DG		 2371 ksess = session->kernel_session;
2372
2373 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2374 if (kchan == NULL) {
2375 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2376 goto error;
d65106b1
DG		 2377 }
2378
b0a40d28 2379 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2380 if (ret != LTTCOMM_OK) {
2381 goto error;
2382 }
2383
2384 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2385 break;
2bdd86d4
MD		 2386 }
2387 case LTTNG_DOMAIN_UST:
b0a40d28
DG		 2388 {
2389 struct ltt_ust_session *usess;
2390 struct ltt_ust_channel *uchan;
35a9059d 2391 struct ltt_ust_event *uevent;
b0a40d28
DG		 2392
2393 usess = session->ust_session;
2394
2395 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2396 channel_name);
2397 if (uchan == NULL) {
2398 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2399 goto error;
2400 }
2401
35a9059d
DG		 2402 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2403 if (uevent == NULL) {
2404 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2405 goto error;
2406 }
2407
2408 ret = ust_app_disable_event_glb(usess, uchan, uevent);
b0a40d28
DG		 2409 if (ret < 0) {
2410 ret = LTTCOMM_UST_DISABLE_FAIL;
2411 goto error;
2412 }
2413
35a9059d
DG		 2414 uevent->enabled = 0;
2415
b0a40d28
DG		 2416 DBG2("Disable UST event %s in channel %s completed", event_name,
2417 channel_name);
2418
2419 break;
2420 }
2bdd86d4
MD		 2421 case LTTNG_DOMAIN_UST_EXEC_NAME:
2422 case LTTNG_DOMAIN_UST_PID:
2423 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2424 default:
54d01ffb
DG		 2425 ret = LTTCOMM_NOT_IMPLEMENTED;
2426 goto error;
d65106b1 2427 }
26cc6b4e 2428
54d01ffb
DG		 2429 ret = LTTCOMM_OK;
2430
2431error:
2432 return ret;
2433}
2434
2435/*
2436 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2437 */
2438static int cmd_disable_event_all(struct ltt_session *session, int domain,
2439 char *channel_name)
2440{
2441 int ret;
54d01ffb
DG		 2442
2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2445 {
2446 struct ltt_kernel_session *ksess;
2447 struct ltt_kernel_channel *kchan;
2448
2449 ksess = session->kernel_session;
2450
2451 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2452 if (kchan == NULL) {
2453 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2454 goto error;
26cc6b4e
DG		 2455 }
2456
9730260e 2457 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2458 if (ret != LTTCOMM_OK) {
0b97ec54 2459 goto error;
26cc6b4e
DG		 2460 }
2461
54d01ffb 2462 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2463 break;
9730260e
DG		 2464 }
2465 case LTTNG_DOMAIN_UST:
2466 {
2467 struct ltt_ust_session *usess;
2468 struct ltt_ust_channel *uchan;
2469
2470 usess = session->ust_session;
2471
2472 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2473 channel_name);
2474 if (uchan == NULL) {
2475 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2476 goto error;
2477 }
2478
35a9059d 2479 ret = ust_app_disable_all_event_glb(usess, uchan);
9730260e
DG		 2480 if (ret < 0) {
2481 ret = LTTCOMM_UST_DISABLE_FAIL;
2482 goto error;
2483 }
2484
2485 DBG2("Disable all UST event in channel %s completed", channel_name);
2486
2487 break;
2488 }
2489 case LTTNG_DOMAIN_UST_EXEC_NAME:
2490 case LTTNG_DOMAIN_UST_PID:
2491 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2492 default:
54d01ffb
DG		 2493 ret = LTTCOMM_NOT_IMPLEMENTED;
2494 goto error;
26cc6b4e 2495 }
e953ef25 2496
54d01ffb 2497 ret = LTTCOMM_OK;
e953ef25 2498
54d01ffb
DG		 2499error:
2500 return ret;
2501}
f5177a38 2502
54d01ffb
DG		 2503/*
2504 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2505 */
2506static int cmd_add_context(struct ltt_session *session, int domain,
2507 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2508{
2509 int ret;
f5177a38 2510
54d01ffb
DG		 2511 switch (domain) {
2512 case LTTNG_DOMAIN_KERNEL:
2513 /* Add kernel context to kernel tracer */
2514 ret = context_kernel_add(session->kernel_session, ctx,
2515 event_name, channel_name);
2516 if (ret != LTTCOMM_OK) {
f5177a38 2517 goto error;
e953ef25 2518 }
2bdd86d4
MD		 2519 break;
2520 case LTTNG_DOMAIN_UST:
2521 {
55cc08a6 2522 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2523
55cc08a6
DG		 2524 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2525 if (ret != LTTCOMM_OK) {
2526 goto error;
2bdd86d4 2527 }
e953ef25 2528 break;
2bdd86d4 2529 }
55cc08a6
DG		 2530 case LTTNG_DOMAIN_UST_EXEC_NAME:
2531 case LTTNG_DOMAIN_UST_PID:
2532 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2533 default:
54d01ffb
DG		 2534 ret = LTTCOMM_NOT_IMPLEMENTED;
2535 goto error;
e953ef25 2536 }
950131af 2537
54d01ffb 2538 ret = LTTCOMM_OK;
950131af 2539
54d01ffb
DG		 2540error:
2541 return ret;
2542}
2543
2544/*
2545 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2546 */
2547static int cmd_enable_event(struct ltt_session *session, int domain,
2548 char *channel_name, struct lttng_event *event)
2549{
2550 int ret;
f6cd6b0f 2551 struct lttng_channel *attr;
48842b30 2552 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2553
2554 switch (domain) {
2555 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2556 {
2557 struct ltt_kernel_channel *kchan;
2558
54d01ffb
DG		 2559 kchan = trace_kernel_get_channel_by_name(channel_name,
2560 session->kernel_session);
2561 if (kchan == NULL) {
f6cd6b0f
DG		 2562 attr = channel_new_default_attr(domain);
2563 if (attr == NULL) {
2564 ret = LTTCOMM_FATAL;
2565 goto error;
2566 }
2567 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2568
54d01ffb 2569 /* This call will notify the kernel thread */
44d3bd01 2570 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2571 attr, kernel_poll_pipe[1]);
54d01ffb 2572 if (ret != LTTCOMM_OK) {
ff4d74e6 2573 free(attr);
f5177a38
DG		 2574 goto error;
2575 }
ff4d74e6 2576 free(attr);
54d01ffb 2577 }
950131af 2578
54d01ffb
DG		 2579 /* Get the newly created kernel channel pointer */
2580 kchan = trace_kernel_get_channel_by_name(channel_name,
2581 session->kernel_session);
2582 if (kchan == NULL) {
2583 /* This sould not happen... */
2584 ret = LTTCOMM_FATAL;
2585 goto error;
2586 }
f5177a38 2587
48842b30
DG		 2588 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2589 event);
54d01ffb 2590 if (ret != LTTCOMM_OK) {
f5177a38 2591 goto error;
950131af
DG		 2592 }
2593
54d01ffb 2594 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2595 break;
2bdd86d4
MD		 2596 }
2597 case LTTNG_DOMAIN_UST:
2598 {
aea829b3 2599 struct lttng_channel *attr;
edb67388 2600 struct ltt_ust_channel *uchan;
2bdd86d4 2601
edb67388 2602 /* Get channel from global UST domain */
48842b30
DG		 2603 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2604 channel_name);
2605 if (uchan == NULL) {
aea829b3
DG		 2606 /* Create default channel */
2607 attr = channel_new_default_attr(domain);
2608 if (attr == NULL) {
2609 ret = LTTCOMM_FATAL;
2610 goto error;
2611 }
596219f7 2612 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2613 attr->name[NAME_MAX - 1] = '\0';
aea829b3
DG		 2614
2615 /* Use the internal command enable channel */
2616 ret = cmd_enable_channel(session, domain, attr);
edb67388 2617 if (ret != LTTCOMM_OK) {
ff4d74e6 2618 free(attr);
aea829b3
DG		 2619 goto error;
2620 }
aea829b3
DG		 2621 free(attr);
2622
2623 /* Get the newly created channel reference back */
2624 uchan = trace_ust_find_channel_by_name(
2625 usess->domain_global.channels, channel_name);
2626 if (uchan == NULL) {
2627 /* Something is really wrong */
2628 ret = LTTCOMM_FATAL;
2629 goto error;
2630 }
48842b30 2631 }
2bdd86d4 2632
edb67388 2633 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2634
edb67388
DG		 2635 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2636 if (ret != LTTCOMM_OK) {
48842b30 2637 goto error;
2bdd86d4
MD		 2638 }
2639 break;
2640 }
2641 case LTTNG_DOMAIN_UST_EXEC_NAME:
2642 case LTTNG_DOMAIN_UST_PID:
2643 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2644 default:
54d01ffb
DG		 2645 ret = LTTCOMM_NOT_IMPLEMENTED;
2646 goto error;
950131af 2647 }
d36b8583 2648
54d01ffb 2649 ret = LTTCOMM_OK;
d36b8583 2650
54d01ffb
DG		 2651error:
2652 return ret;
2653}
7d29a247 2654
54d01ffb
DG		 2655/*
2656 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2657 */
2658static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2659 char *channel_name, int event_type)
54d01ffb
DG		 2660{
2661 int ret;
2662 struct ltt_kernel_channel *kchan;
7d29a247 2663
54d01ffb
DG		 2664 switch (domain) {
2665 case LTTNG_DOMAIN_KERNEL:
2666 kchan = trace_kernel_get_channel_by_name(channel_name,
2667 session->kernel_session);
2668 if (kchan == NULL) {
2669 /* This call will notify the kernel thread */
44d3bd01
DG		 2670 ret = channel_kernel_create(session->kernel_session, NULL,
2671 kernel_poll_pipe[1]);
54d01ffb
DG		 2672 if (ret != LTTCOMM_OK) {
2673 goto error;
d36b8583 2674 }
54d01ffb 2675 }
0d0c377a 2676
54d01ffb
DG		 2677 /* Get the newly created kernel channel pointer */
2678 kchan = trace_kernel_get_channel_by_name(channel_name,
2679 session->kernel_session);
2680 if (kchan == NULL) {
2681 /* This sould not happen... */
2682 ret = LTTCOMM_FATAL;
2683 goto error;
2684 }
0fdd1e2c 2685
7a3d1328
MD		 2686 switch (event_type) {
2687 case LTTNG_KERNEL_SYSCALL:
2688 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2689 kchan, kernel_tracer_fd);
7a3d1328
MD		 2690 break;
2691 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2692 /*
7a3d1328
MD		 2693 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2694 * events already registered to the channel.
8c9ae521 2695 */
7a3d1328
MD		 2696 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2697 kchan, kernel_tracer_fd);
2698 break;
2699 case LTTNG_KERNEL_ALL:
2700 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2701 ret = event_kernel_enable_all(session->kernel_session,
2702 kchan, kernel_tracer_fd);
7a3d1328
MD		 2703 break;
2704 default:
2705 ret = LTTCOMM_KERN_ENABLE_FAIL;
2706 goto error;
8c9ae521 2707 }
54d01ffb 2708 if (ret != LTTCOMM_OK) {
0d0c377a 2709 goto error;
d36b8583
DG		 2710 }
2711
54d01ffb 2712 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2713 break;
54d01ffb
DG		 2714 default:
2715 /* TODO: Userspace tracing */
2716 ret = LTTCOMM_NOT_IMPLEMENTED;
2717 goto error;
d36b8583 2718 }
f3ed775e 2719
54d01ffb
DG		 2720 ret = LTTCOMM_OK;
2721
2722error:
2723 return ret;
2724}
2725
2726/*
2727 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2728 */
2729static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2730{
2731 int ret;
2732 ssize_t nb_events = 0;
2733
2734 switch (domain) {
2735 case LTTNG_DOMAIN_KERNEL:
2736 nb_events = kernel_list_events(kernel_tracer_fd, events);
2737 if (nb_events < 0) {
2738 ret = LTTCOMM_KERN_LIST_FAIL;
2739 goto error;
894be886 2740 }
54d01ffb 2741 break;
b551a063
DG		 2742 case LTTNG_DOMAIN_UST:
2743 nb_events = ust_app_list_events(events);
2744 if (nb_events < 0) {
2745 ret = LTTCOMM_UST_LIST_FAIL;
2746 goto error;
2747 }
2748 break;
54d01ffb 2749 default:
54d01ffb
DG		 2750 ret = LTTCOMM_NOT_IMPLEMENTED;
2751 goto error;
2752 }
894be886 2753
54d01ffb 2754 return nb_events;
7d29a247 2755
54d01ffb
DG		 2756error:
2757 /* Return negative value to differentiate return code */
2758 return -ret;
2759}
b389abbe 2760
54d01ffb
DG		 2761/*
2762 * Command LTTNG_START_TRACE processed by the client thread.
2763 */
2764static int cmd_start_trace(struct ltt_session *session)
2765{
2766 int ret;
54d01ffb 2767 struct ltt_kernel_session *ksession;
b9d9b220 2768 struct ltt_ust_session *usess;
b389abbe 2769
54d01ffb
DG		 2770 /* Short cut */
2771 ksession = session->kernel_session;
b9d9b220 2772 usess = session->ust_session;
5eb91c98 2773
464dd62d
MD		 2774 if (session->enabled)
2775 return LTTCOMM_UST_START_FAIL;
2776 session->enabled = 1;
2777
54d01ffb
DG		 2778 /* Kernel tracing */
2779 if (ksession != NULL) {
2bdd86d4
MD		 2780 struct ltt_kernel_channel *kchan;
2781
54d01ffb
DG		 2782 /* Open kernel metadata */
2783 if (ksession->metadata == NULL) {
2784 ret = kernel_open_metadata(ksession, ksession->trace_path);
2785 if (ret < 0) {
2786 ret = LTTCOMM_KERN_META_FAIL;
2787 goto error;
b389abbe 2788 }
54d01ffb 2789 }
7d29a247 2790
54d01ffb
DG		 2791 /* Open kernel metadata stream */
2792 if (ksession->metadata_stream_fd == 0) {
2793 ret = kernel_open_metadata_stream(ksession);
2794 if (ret < 0) {
2795 ERR("Kernel create metadata stream failed");
2796 ret = LTTCOMM_KERN_STREAM_FAIL;
2797 goto error;
2798 }
2799 }
2800
2801 /* For each channel */
2802 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2803 if (kchan->stream_count == 0) {
2804 ret = kernel_open_channel_stream(kchan);
2805 if (ret < 0) {
2806 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2807 goto error;
2808 }
54d01ffb
DG		 2809 /* Update the stream global counter */
2810 ksession->stream_count_global += ret;
7d29a247 2811 }
54d01ffb
DG		 2812 }
2813
2814 /* Setup kernel consumer socket and send fds to it */
2815 ret = init_kernel_tracing(ksession);
2816 if (ret < 0) {
2817 ret = LTTCOMM_KERN_START_FAIL;
2818 goto error;
2819 }
2820
2821 /* This start the kernel tracing */
2822 ret = kernel_start_session(ksession);
2823 if (ret < 0) {
2824 ret = LTTCOMM_KERN_START_FAIL;
2825 goto error;
2826 }
2827
2828 /* Quiescent wait after starting trace */
2829 kernel_wait_quiescent(kernel_tracer_fd);
2830 }
2831
36dc12cc 2832 /* Flag session that trace should start automatically */
b9d9b220
DG		 2833 if (usess) {
2834 usess->start_trace = 1;
36dc12cc 2835
b9d9b220
DG		 2836 ret = ust_app_start_trace_all(usess);
2837 if (ret < 0) {
2838 ret = LTTCOMM_UST_START_FAIL;
2839 goto error;
2840 }
2bdd86d4 2841 }
54d01ffb
DG		 2842
2843 ret = LTTCOMM_OK;
2844
2845error:
2846 return ret;
2847}
2848
2849/*
2850 * Command LTTNG_STOP_TRACE processed by the client thread.
2851 */
2852static int cmd_stop_trace(struct ltt_session *session)
2853{
2854 int ret;
2855 struct ltt_kernel_channel *kchan;
2856 struct ltt_kernel_session *ksession;
8be98f9a 2857 struct ltt_ust_session *usess;
54d01ffb
DG		 2858
2859 /* Short cut */
2860 ksession = session->kernel_session;
8be98f9a 2861 usess = session->ust_session;
54d01ffb 2862
464dd62d
MD		 2863 if (!session->enabled)
2864 return LTTCOMM_UST_START_FAIL;
2865 session->enabled = 0;
2866
54d01ffb
DG		 2867 /* Kernel tracer */
2868 if (ksession != NULL) {
2869 DBG("Stop kernel tracing");
2870
2871 /* Flush all buffers before stopping */
2872 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2873 if (ret < 0) {
2874 ERR("Kernel metadata flush failed");
2875 }
f34daff7 2876
54d01ffb
DG		 2877 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2878 ret = kernel_flush_buffer(kchan);
0d0c377a 2879 if (ret < 0) {
54d01ffb 2880 ERR("Kernel flush buffer error");
7d29a247 2881 }
54d01ffb 2882 }
19e70852 2883
54d01ffb
DG		 2884 ret = kernel_stop_session(ksession);
2885 if (ret < 0) {
2886 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2887 goto error;
f3ed775e 2888 }
54d01ffb
DG		 2889
2890 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2891 }
54d01ffb 2892
8be98f9a
MD		 2893 if (usess) {
2894 usess->start_trace = 0;
2bdd86d4 2895
8be98f9a 2896 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2897 if (ret < 0) {
8be98f9a 2898 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD		 2899 goto error;
2900 }
2bdd86d4 2901 }
54d01ffb
DG		 2902
2903 ret = LTTCOMM_OK;
2904
2905error:
2906 return ret;
2907}
2908
2909/*
2910 * Command LTTNG_CREATE_SESSION processed by the client thread.
2911 */
2912static int cmd_create_session(char *name, char *path)
2913{
2914 int ret;
2915
2916 ret = session_create(name, path);
2917 if (ret != LTTCOMM_OK) {
2918 goto error;
2919 }
2920
2921 ret = LTTCOMM_OK;
2922
2923error:
2924 return ret;
2925}
2926
2927/*
2928 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2929 */
2930static int cmd_destroy_session(struct ltt_session *session, char *name)
2931{
2932 int ret;
2933
2934 /* Clean kernel session teardown */
2935 teardown_kernel_session(session);
84cd17c6
MD		 2936 /* UST session teardown */
2937 teardown_ust_session(session);
54d01ffb
DG		 2938
2939 /*
2940 * Must notify the kernel thread here to update it's poll setin order
2941 * to remove the channel(s)' fd just destroyed.
2942 */
2943 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2944 if (ret < 0) {
2945 perror("write kernel poll pipe");
2946 }
2947
271933a4 2948 ret = session_destroy(session);
54d01ffb
DG		 2949
2950 return ret;
2951}
2952
2953/*
2954 * Command LTTNG_CALIBRATE processed by the client thread.
2955 */
2956static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2957{
2958 int ret;
2959
2960 switch (domain) {
2961 case LTTNG_DOMAIN_KERNEL:
33a2b854 2962 {
54d01ffb 2963 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2964
54d01ffb
DG		 2965 kcalibrate.type = calibrate->type;
2966 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2967 if (ret < 0) {
54d01ffb
DG		 2968 ret = LTTCOMM_KERN_ENABLE_FAIL;
2969 goto error;
33a2b854 2970 }
54d01ffb
DG		 2971 break;
2972 }
2973 default:
2974 /* TODO: Userspace tracing */
2975 ret = LTTCOMM_NOT_IMPLEMENTED;
2976 goto error;
2977 }
33a2b854 2978
54d01ffb 2979 ret = LTTCOMM_OK;
33a2b854 2980
54d01ffb
DG		 2981error:
2982 return ret;
2983}
7d29a247 2984
54d01ffb
DG		 2985/*
2986 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2987 */
2988static int cmd_register_consumer(struct ltt_session *session, int domain,
2989 char *sock_path)
2990{
2991 int ret, sock;
b389abbe 2992
54d01ffb
DG		 2993 switch (domain) {
2994 case LTTNG_DOMAIN_KERNEL:
2995 /* Can't register a consumer if there is already one */
2996 if (session->kernel_session->consumer_fd != 0) {
2997 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2998 goto error;
2999 }
3000
3001 sock = lttcomm_connect_unix_sock(sock_path);
3002 if (sock < 0) {
3003 ret = LTTCOMM_CONNECT_FAIL;
3004 goto error;
3005 }
3006
3007 session->kernel_session->consumer_fd = sock;
3008 break;
3009 default:
3010 /* TODO: Userspace tracing */
3011 ret = LTTCOMM_NOT_IMPLEMENTED;
3012 goto error;
3013 }
3014
3015 ret = LTTCOMM_OK;
3016
3017error:
3018 return ret;
3019}
3020
3021/*
3022 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3023 */
3024static ssize_t cmd_list_domains(struct ltt_session *session,
3025 struct lttng_domain **domains)
3026{
b551a063 3027 int ret, index = 0;
54d01ffb
DG		 3028 ssize_t nb_dom = 0;
3029
3030 if (session->kernel_session != NULL) {
b551a063 3031 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3032 nb_dom++;
3033 }
3034
b551a063
DG		 3035 if (session->ust_session != NULL) {
3036 DBG3("Listing domains found UST global domain");
3037 nb_dom++;
3038 }
54d01ffb 3039
b551a063 3040 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3041 if (*domains == NULL) {
3042 ret = -LTTCOMM_FATAL;
3043 goto error;
3044 }
3045
b551a063
DG		 3046 if (session->kernel_session != NULL) {
3047 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3048 index++;
3049 }
3050
3051 if (session->ust_session != NULL) {
3052 (*domains)[index].type = LTTNG_DOMAIN_UST;
3053 index++;
3054 }
54d01ffb 3055
54d01ffb
DG		 3056 return nb_dom;
3057
3058error:
3059 return ret;
3060}
3061
3062/*
3063 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3064 */
b551a063 3065static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3066 struct lttng_channel **channels)
3067{
3068 int ret;
3069 ssize_t nb_chan = 0;
3070
b551a063
DG		 3071 switch (domain) {
3072 case LTTNG_DOMAIN_KERNEL:
3073 if (session->kernel_session != NULL) {
3074 nb_chan = session->kernel_session->channel_count;
3075 }
0df502fd 3076 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3077 break;
3078 case LTTNG_DOMAIN_UST:
3079 if (session->ust_session != NULL) {
3080 nb_chan = hashtable_get_count(
3081 session->ust_session->domain_global.channels);
3082 }
0df502fd 3083 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3084 break;
3085 default:
3086 *channels = NULL;
3087 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3088 goto error;
3089 }
3090
b551a063
DG		 3091 if (nb_chan > 0) {
3092 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3093 if (*channels == NULL) {
3094 ret = -LTTCOMM_FATAL;
3095 goto error;
3096 }
54d01ffb 3097
b551a063
DG		 3098 list_lttng_channels(domain, session, *channels);
3099 } else {
3100 *channels = NULL;
3101 }
2bdd86d4 3102
54d01ffb
DG		 3103 return nb_chan;
3104
3105error:
3106 return ret;
3107}
3108
3109/*
3110 * Command LTTNG_LIST_EVENTS processed by the client thread.
3111 */
b551a063 3112static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3113 char *channel_name, struct lttng_event **events)
3114{
b551a063 3115 int ret = 0;
54d01ffb 3116 ssize_t nb_event = 0;
54d01ffb 3117
b551a063
DG		 3118 switch (domain) {
3119 case LTTNG_DOMAIN_KERNEL:
3120 if (session->kernel_session != NULL) {
3121 nb_event = list_lttng_kernel_events(channel_name,
3122 session->kernel_session, events);
54d01ffb 3123 }
b551a063
DG		 3124 break;
3125 case LTTNG_DOMAIN_UST:
3126 {
3127 if (session->ust_session != NULL) {
3128 nb_event = list_lttng_ust_global_events(channel_name,
3129 &session->ust_session->domain_global, events);
3130 }
3131 break;
54d01ffb 3132 }
b551a063
DG		 3133 default:
3134 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3135 goto error;
3136 }
3137
b551a063 3138 ret = nb_event;
54d01ffb
DG		 3139
3140error:
3141 return ret;
3142}
3143
3144/*
3145 * Process the command requested by the lttng client within the command
3146 * context structure. This function make sure that the return structure (llm)
3147 * is set and ready for transmission before returning.
3148 *
3149 * Return any error encountered or 0 for success.
3150 */
3151static int process_client_msg(struct command_ctx *cmd_ctx)
3152{
3153 int ret = LTTCOMM_OK;
44d3bd01 3154 int need_tracing_session = 1;
54d01ffb
DG		 3155
3156 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3157
3158 /*
3159 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3160 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3161 * command.
3162 */
3163 switch(cmd_ctx->lsm->cmd_type) {
3164 case LTTNG_LIST_SESSIONS:
3165 case LTTNG_LIST_TRACEPOINTS:
3166 case LTTNG_LIST_DOMAINS:
3167 case LTTNG_LIST_CHANNELS:
3168 case LTTNG_LIST_EVENTS:
3169 break;
3170 default:
3171 /* Setup lttng message with no payload */
3172 ret = setup_lttng_msg(cmd_ctx, 0);
3173 if (ret < 0) {
3174 /* This label does not try to unlock the session */
3175 goto init_setup_error;
3176 }
3177 }
3178
3179 /* Commands that DO NOT need a session. */
3180 switch (cmd_ctx->lsm->cmd_type) {
3181 case LTTNG_CALIBRATE:
3182 case LTTNG_CREATE_SESSION:
3183 case LTTNG_LIST_SESSIONS:
3184 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3185 need_tracing_session = 0;
54d01ffb
DG		 3186 break;
3187 default:
3188 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3189 session_lock_list();
54d01ffb 3190 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3191 session_unlock_list();
54d01ffb
DG		 3192 if (cmd_ctx->session == NULL) {
3193 if (cmd_ctx->lsm->session.name != NULL) {
3194 ret = LTTCOMM_SESS_NOT_FOUND;
3195 } else {
3196 /* If no session name specified */
3197 ret = LTTCOMM_SELECT_SESS;
3198 }
3199 goto error;
3200 } else {
3201 /* Acquire lock for the session */
3202 session_lock(cmd_ctx->session);
3203 }
3204 break;
3205 }
b389abbe 3206
54d01ffb
DG		 3207 /*
3208 * Check domain type for specific "pre-action".
3209 */
3210 switch (cmd_ctx->lsm->domain.type) {
3211 case LTTNG_DOMAIN_KERNEL:
3212 /* Kernel tracer check */
3213 if (kernel_tracer_fd == 0) {
3214 /* Basically, load kernel tracer modules */
3215 init_kernel_tracer();
3216 if (kernel_tracer_fd == 0) {
3217 ret = LTTCOMM_KERN_NA;
3218 goto error;
3219 }
3220 }
5eb91c98 3221
54d01ffb 3222 /* Need a session for kernel command */
44d3bd01 3223 if (need_tracing_session) {
54d01ffb
DG		 3224 if (cmd_ctx->session->kernel_session == NULL) {
3225 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3226 if (ret < 0) {
54d01ffb 3227 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3228 goto error;
3229 }
b389abbe 3230 }
7d29a247 3231
54d01ffb 3232 /* Start the kernel consumer daemon */
3bd1e081
MD		 3233 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3234 if (kconsumer_data.pid == 0 &&
54d01ffb 3235 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3236 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3237 ret = start_consumerd(&kconsumer_data);
7d29a247 3238 if (ret < 0) {
54d01ffb
DG		 3239 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3240 goto error;
950131af 3241 }
3ff2ecac
MD		 3242 } else {
3243 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3244 }
0d0c377a 3245 }
54d01ffb 3246 break;
2bdd86d4 3247 case LTTNG_DOMAIN_UST:
44d3bd01 3248 {
44d3bd01 3249 if (need_tracing_session) {
f6a9efaa 3250 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3251 ret = create_ust_session(cmd_ctx->session,
3252 &cmd_ctx->lsm->domain);
3253 if (ret != LTTCOMM_OK) {
3254 goto error;
3255 }
3256 }
7753dea8
MD		 3257 /* Start the UST consumer daemons */
3258 /* 64-bit */
3259 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
ebaeda94 3260 if (consumerd64_path[0] != '\0' &&
7753dea8 3261 ustconsumer64_data.pid == 0 &&
2bdd86d4 3262 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3263 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3264 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3265 if (ret < 0) {
7753dea8
MD		 3266 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3267 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3268 goto error;
3269 }
48842b30 3270
7753dea8 3271 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3272 } else {
7753dea8
MD		 3273 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3274 }
3275 /* 32-bit */
ebaeda94 3276 if (consumerd32_path[0] != '\0' &&
7753dea8
MD		 3277 ustconsumer32_data.pid == 0 &&
3278 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3279 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3280 ret = start_consumerd(&ustconsumer32_data);
3281 if (ret < 0) {
3282 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3283 ust_consumerd32_fd = -EINVAL;
3284 goto error;
3285 }
3286 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3287 } else {
3288 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3289 }
44d3bd01
DG		 3290 }
3291 break;
48842b30 3292 }
54d01ffb 3293 default:
54d01ffb
DG		 3294 break;
3295 }
33a2b854 3296
54d01ffb
DG		 3297 /* Process by command type */
3298 switch (cmd_ctx->lsm->cmd_type) {
3299 case LTTNG_ADD_CONTEXT:
3300 {
3301 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3302 cmd_ctx->lsm->u.context.channel_name,
3303 cmd_ctx->lsm->u.context.event_name,
3304 &cmd_ctx->lsm->u.context.ctx);
3305 break;
3306 }
3307 case LTTNG_DISABLE_CHANNEL:
3308 {
3309 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3310 cmd_ctx->lsm->u.disable.channel_name);
3311 break;
3312 }
3313 case LTTNG_DISABLE_EVENT:
3314 {
3315 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3316 cmd_ctx->lsm->u.disable.channel_name,
3317 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3318 ret = LTTCOMM_OK;
3319 break;
3320 }
54d01ffb
DG		 3321 case LTTNG_DISABLE_ALL_EVENT:
3322 {
2bdd86d4 3323 DBG("Disabling all events");
54d01ffb
DG		 3324
3325 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3326 cmd_ctx->lsm->u.disable.channel_name);
3327 break;
3328 }
3329 case LTTNG_ENABLE_CHANNEL:
3330 {
aea829b3 3331 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3332 &cmd_ctx->lsm->u.channel.chan);
3333 break;
3334 }
3335 case LTTNG_ENABLE_EVENT:
3336 {
3337 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3338 cmd_ctx->lsm->u.enable.channel_name,
3339 &cmd_ctx->lsm->u.enable.event);
3340 break;
3341 }
3342 case LTTNG_ENABLE_ALL_EVENT:
3343 {
2bdd86d4 3344 DBG("Enabling all events");
54d01ffb
DG		 3345
3346 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3347 cmd_ctx->lsm->u.enable.channel_name,
3348 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3349 break;
3350 }
052da939 3351 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3352 {
9f19cc17 3353 struct lttng_event *events;
54d01ffb 3354 ssize_t nb_events;
052da939 3355
54d01ffb
DG		 3356 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3357 if (nb_events < 0) {
3358 ret = -nb_events;
3359 goto error;
2ef84c95
DG		 3360 }
3361
3362 /*
3363 * Setup lttng message with payload size set to the event list size in
3364 * bytes and then copy list into the llm payload.
3365 */
052da939 3366 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3367 if (ret < 0) {
052da939 3368 free(events);
2ef84c95
DG		 3369 goto setup_error;
3370 }
3371
3372 /* Copy event list into message payload */
9f19cc17 3373 memcpy(cmd_ctx->llm->payload, events,
052da939 3374 sizeof(struct lttng_event) * nb_events);
2ef84c95 3375
9f19cc17 3376 free(events);
2ef84c95
DG		 3377
3378 ret = LTTCOMM_OK;
3379 break;
3380 }
f3ed775e 3381 case LTTNG_START_TRACE:
8c0faa1d 3382 {
54d01ffb 3383 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3384 break;
3385 }
f3ed775e 3386 case LTTNG_STOP_TRACE:
8c0faa1d 3387 {
54d01ffb 3388 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3389 break;
3390 }
5e16da05
MD		 3391 case LTTNG_CREATE_SESSION:
3392 {
54d01ffb
DG		 3393 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3394 cmd_ctx->lsm->session.path);
5e16da05
MD		 3395 break;
3396 }
3397 case LTTNG_DESTROY_SESSION:
3398 {
54d01ffb
DG		 3399 ret = cmd_destroy_session(cmd_ctx->session,
3400 cmd_ctx->lsm->session.name);
5461b305 3401 break;
5e16da05 3402 }
9f19cc17 3403 case LTTNG_LIST_DOMAINS:
5e16da05 3404 {
54d01ffb
DG		 3405 ssize_t nb_dom;
3406 struct lttng_domain *domains;
5461b305 3407
54d01ffb
DG		 3408 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3409 if (nb_dom < 0) {
3410 ret = -nb_dom;
3411 goto error;
ce3d728c 3412 }
520ff687 3413
54d01ffb 3414 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3415 if (ret < 0) {
3416 goto setup_error;
520ff687 3417 }
57167058 3418
54d01ffb
DG		 3419 /* Copy event list into message payload */
3420 memcpy(cmd_ctx->llm->payload, domains,
3421 nb_dom * sizeof(struct lttng_domain));
3422
3423 free(domains);
5e16da05 3424
5461b305 3425 ret = LTTCOMM_OK;
5e16da05
MD		 3426 break;
3427 }
9f19cc17 3428 case LTTNG_LIST_CHANNELS:
5e16da05 3429 {
54d01ffb
DG		 3430 size_t nb_chan;
3431 struct lttng_channel *channels;
3432
b551a063
DG		 3433 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3434 cmd_ctx->session, &channels);
54d01ffb
DG		 3435 if (nb_chan < 0) {
3436 ret = -nb_chan;
3437 goto error;
5461b305 3438 }
ca95a216 3439
54d01ffb 3440 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3441 if (ret < 0) {
3442 goto setup_error;
3443 }
9f19cc17 3444
54d01ffb
DG		 3445 /* Copy event list into message payload */
3446 memcpy(cmd_ctx->llm->payload, channels,
3447 nb_chan * sizeof(struct lttng_channel));
3448
3449 free(channels);
9f19cc17
DG		 3450
3451 ret = LTTCOMM_OK;
5461b305 3452 break;
5e16da05 3453 }
9f19cc17 3454 case LTTNG_LIST_EVENTS:
5e16da05 3455 {
b551a063 3456 ssize_t nb_event;
684d34d2 3457 struct lttng_event *events = NULL;
9f19cc17 3458
b551a063 3459 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3460 cmd_ctx->lsm->u.list.channel_name, &events);
3461 if (nb_event < 0) {
3462 ret = -nb_event;
3463 goto error;
5461b305 3464 }
ca95a216 3465
54d01ffb 3466 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3467 if (ret < 0) {
3468 goto setup_error;
3469 }
9f19cc17 3470
54d01ffb
DG		 3471 /* Copy event list into message payload */
3472 memcpy(cmd_ctx->llm->payload, events,
3473 nb_event * sizeof(struct lttng_event));
9f19cc17 3474
54d01ffb 3475 free(events);
9f19cc17
DG		 3476
3477 ret = LTTCOMM_OK;
5461b305 3478 break;
5e16da05
MD		 3479 }
3480 case LTTNG_LIST_SESSIONS:
3481 {
54d01ffb 3482 session_lock_list();
5461b305 3483
6c9cc2ab 3484 if (session_list_ptr->count == 0) {
f3ed775e 3485 ret = LTTCOMM_NO_SESSION;
54d01ffb 3486 session_unlock_list();
5461b305 3487 goto error;
57167058 3488 }
5e16da05 3489
6c9cc2ab
DG		 3490 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3491 session_list_ptr->count);
5461b305 3492 if (ret < 0) {
54d01ffb 3493 session_unlock_list();
5461b305 3494 goto setup_error;
e065084a 3495 }
5e16da05 3496
6c9cc2ab
DG		 3497 /* Filled the session array */
3498 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3499
54d01ffb 3500 session_unlock_list();
5e16da05 3501
5461b305 3502 ret = LTTCOMM_OK;
5e16da05
MD		 3503 break;
3504 }
d0254c7c
MD		 3505 case LTTNG_CALIBRATE:
3506 {
54d01ffb
DG		 3507 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3508 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3509 break;
3510 }
d9800920
DG		 3511 case LTTNG_REGISTER_CONSUMER:
3512 {
54d01ffb
DG		 3513 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3514 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3515 break;
3516 }
5e16da05 3517 default:
5e16da05 3518 ret = LTTCOMM_UND;
5461b305 3519 break;
fac6795d
DG		 3520 }
3521
5461b305 3522error:
5461b305
DG		 3523 if (cmd_ctx->llm == NULL) {
3524 DBG("Missing llm structure. Allocating one.");
894be886 3525 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3526 goto setup_error;
3527 }
3528 }
54d01ffb 3529 /* Set return code */
5461b305 3530 cmd_ctx->llm->ret_code = ret;
5461b305 3531setup_error:
b5541356 3532 if (cmd_ctx->session) {
54d01ffb 3533 session_unlock(cmd_ctx->session);
b5541356 3534 }
54d01ffb 3535init_setup_error:
8028d920 3536 return ret;
fac6795d
DG		 3537}
3538
1d4b027a 3539/*
d063d709
DG		 3540 * This thread manage all clients request using the unix client socket for
3541 * communication.
1d4b027a
DG		 3542 */
3543static void *thread_manage_clients(void *data)
3544{
5eb91c98
DG		 3545 int sock = 0, ret, i, pollfd;
3546 uint32_t revents, nb_fd;
273ea72c 3547 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3548 struct lttng_poll_event events;
1d4b027a
DG		 3549
3550 DBG("[thread] Manage client started");
3551
f6a9efaa
DG		 3552 rcu_register_thread();
3553
1d4b027a
DG		 3554 ret = lttcomm_listen_unix_sock(client_sock);
3555 if (ret < 0) {
3556 goto error;
3557 }
3558
5eb91c98
DG		 3559 /*
3560 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3561 * more will be added to this poll set.
3562 */
3563 ret = create_thread_poll_set(&events, 2);
3564 if (ret < 0) {
3565 goto error;
3566 }
273ea72c 3567
5eb91c98
DG		 3568 /* Add the application registration socket */
3569 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3570 if (ret < 0) {
3571 goto error;
3572 }
273ea72c 3573
bbd973c2
DG		 3574 /*
3575 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3576 */
3577 if (opt_sig_parent) {
3578 kill(ppid, SIGCHLD);
3579 }
3580
3581 while (1) {
1d4b027a 3582 DBG("Accepting client command ...");
273ea72c 3583
5eb91c98
DG		 3584 nb_fd = LTTNG_POLL_GETNB(&events);
3585
273ea72c 3586 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3587 ret = lttng_poll_wait(&events, -1);
273ea72c 3588 if (ret < 0) {
273ea72c
DG		 3589 goto error;
3590 }
3591
5eb91c98
DG		 3592 for (i = 0; i < nb_fd; i++) {
3593 /* Fetch once the poll data */
3594 revents = LTTNG_POLL_GETEV(&events, i);
3595 pollfd = LTTNG_POLL_GETFD(&events, i);
3596
3597 /* Thread quit pipe has been closed. Killing thread. */
3598 ret = check_thread_quit_pipe(pollfd, revents);
3599 if (ret) {
3600 goto error;
3601 }
3602
3603 /* Event on the registration socket */
3604 if (pollfd == client_sock) {
3605 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3606 ERR("Client socket poll error");
3607 goto error;
3608 }
3609 }
3610 }
3611
3612 DBG("Wait for client response");
3613
3614 sock = lttcomm_accept_unix_sock(client_sock);
3615 if (sock < 0) {
273ea72c 3616 goto error;
273ea72c
DG		 3617 }
3618
5eb91c98 3619 /* Allocate context command to process the client request */
ba7f0ae5 3620 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3621 if (cmd_ctx == NULL) {
ba7f0ae5 3622 perror("zmalloc cmd_ctx");
1d4b027a 3623 goto error;
5eb91c98 3624 }
1d4b027a 3625
5eb91c98 3626 /* Allocate data buffer for reception */
ba7f0ae5 3627 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3628 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3629 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3630 goto error;
3631 }
1d4b027a 3632
5eb91c98
DG		 3633 cmd_ctx->llm = NULL;
3634 cmd_ctx->session = NULL;
1d4b027a 3635
5eb91c98
DG		 3636 /*
3637 * Data is received from the lttng client. The struct
3638 * lttcomm_session_msg (lsm) contains the command and data request of
3639 * the client.
3640 */
3641 DBG("Receiving data from client ...");
3642 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3643 sizeof(struct lttcomm_session_msg));
3644 if (ret <= 0) {
3645 DBG("Nothing recv() from client... continuing");
3646 close(sock);
3647 free(cmd_ctx);
3648 continue;
3649 }
1d4b027a 3650
5eb91c98
DG		 3651 // TODO: Validate cmd_ctx including sanity check for
3652 // security purpose.
f7776ea7 3653
f6a9efaa 3654 rcu_thread_online();
5eb91c98
DG		 3655 /*
3656 * This function dispatch the work to the kernel or userspace tracer
3657 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3658 * informations for the client. The command context struct contains
3659 * everything this function may needs.
3660 */
3661 ret = process_client_msg(cmd_ctx);
f6a9efaa 3662 rcu_thread_offline();
5eb91c98 3663 if (ret < 0) {
bbd973c2 3664 /*
5eb91c98 3665 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3666 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3667 * (ENOMEM). Error detected but still accept command.
bbd973c2 3668 */
bbd973c2 3669 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3670 continue;
3671 }
d6e4fca4 3672
54d01ffb
DG		 3673 DBG("Sending response (size: %d, retcode: %s)",
3674 cmd_ctx->lttng_msg_size,
9a745bc7 3675 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3676 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3677 if (ret < 0) {
3678 ERR("Failed to send data back to client");
bbd973c2 3679 }
1d4b027a 3680
5eb91c98
DG		 3681 clean_command_ctx(&cmd_ctx);
3682
3683 /* End of transmission */
273ea72c
DG		 3684 close(sock);
3685 }
3686
5eb91c98
DG		 3687error:
3688 DBG("Client thread dying");
273ea72c 3689 unlink(client_unix_sock_path);
5eb91c98
DG		 3690 close(client_sock);
3691 close(sock);
273ea72c 3692
5eb91c98 3693 lttng_poll_clean(&events);
a2fb29a5 3694 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3695
3696 rcu_unregister_thread();
1d4b027a
DG		 3697 return NULL;
3698}
3699
3700
fac6795d
DG		 3701/*
3702 * usage function on stderr
3703 */
3704static void usage(void)
3705{
b716ce68 3706 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3707 fprintf(stderr, " -h, --help Display this usage.\n");
3708 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3709 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3710 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3711 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3712 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3713 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3714 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3715 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3716 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3717 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3718 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3719 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3720 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3721 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3722 fprintf(stderr, " -V, --version Show version number.\n");
3723 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3724 fprintf(stderr, " -q, --quiet No output at all.\n");
3725 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3726 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG		 3727}
3728
3729/*
3730 * daemon argument parsing
3731 */
3732static int parse_args(int argc, char **argv)
3733{
3734 int c;
3735
3736 static struct option long_options[] = {
3737 { "client-sock", 1, 0, 'c' },
3738 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3739 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3740 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3741 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3742 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3743 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3744 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3745 { "consumerd32-path", 1, 0, 'u' },
3746 { "consumerd32-libdir", 1, 0, 'U' },
3747 { "consumerd64-path", 1, 0, 't' },
3748 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3749 { "daemonize", 0, 0, 'd' },
5b8719f5 3750 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3751 { "help", 0, 0, 'h' },
3752 { "group", 1, 0, 'g' },
3753 { "version", 0, 0, 'V' },
75462a81 3754 { "quiet", 0, 0, 'q' },
3f9947db 3755 { "verbose", 0, 0, 'v' },
3bd1e081 3756 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG		 3757 { NULL, 0, 0, 0 }
3758 };
3759
3760 while (1) {
3761 int option_index = 0;
7753dea8 3762 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3763 long_options, &option_index);
fac6795d
DG		 3764 if (c == -1) {
3765 break;
3766 }
3767
3768 switch (c) {
3769 case 0:
3770 fprintf(stderr, "option %s", long_options[option_index].name);
3771 if (optarg) {
3772 fprintf(stderr, " with arg %s\n", optarg);
3773 }
3774 break;
b716ce68 3775 case 'c':
fac6795d
DG		 3776 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3777 break;
3778 case 'a':
3779 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3780 break;
3781 case 'd':
3782 opt_daemon = 1;
3783 break;
3784 case 'g':
fb09408a 3785 opt_tracing_group = optarg;
fac6795d
DG		 3786 break;
3787 case 'h':
3788 usage();
3789 exit(EXIT_FAILURE);
3790 case 'V':
3791 fprintf(stdout, "%s\n", VERSION);
3792 exit(EXIT_SUCCESS);
5b8719f5
DG		 3793 case 'S':
3794 opt_sig_parent = 1;
3795 break;
d6f42150 3796 case 'E':
3bd1e081 3797 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3798 break;
3799 case 'C':
3bd1e081
MD		 3800 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3801 break;
3802 case 'F':
7753dea8 3803 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3804 break;
3805 case 'D':
7753dea8
MD		 3806 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3807 break;
3808 case 'H':
3809 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3810 break;
3811 case 'G':
3812 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3813 break;
75462a81
DG		 3814 case 'q':
3815 opt_quiet = 1;
3816 break;
3f9947db 3817 case 'v':
53086306
DG		 3818 /* Verbose level can increase using multiple -v */
3819 opt_verbose += 1;
3f9947db 3820 break;
31f73cc9 3821 case 'Z':
3bd1e081 3822 opt_verbose_consumer += 1;
31f73cc9 3823 break;
fb09408a 3824 case 'u':
ebaeda94
MD		 3825 consumerd32_path= optarg;
3826 break;
3827 case 'U':
3828 consumerd32_libdir = optarg;
7753dea8
MD		 3829 break;
3830 case 't':
ebaeda94
MD		 3831 consumerd64_path = optarg;
3832 break;
3833 case 'T':
3834 consumerd64_libdir = optarg;
fb09408a 3835 break;
fac6795d
DG		 3836 default:
3837 /* Unknown option or other error.
3838 * Error is printed by getopt, just return */
3839 return -1;
3840 }
3841 }
3842
3843 return 0;
3844}
3845
3846/*
d063d709 3847 * Creates the two needed socket by the daemon.
d6f42150
DG		 3848 * apps_sock - The communication socket for all UST apps.
3849 * client_sock - The communication of the cli tool (lttng).
fac6795d 3850 */
cf3af59e 3851static int init_daemon_socket(void)
fac6795d
DG		 3852{
3853 int ret = 0;
3854 mode_t old_umask;
3855
3856 old_umask = umask(0);
3857
3858 /* Create client tool unix socket */
d6f42150
DG		 3859 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3860 if (client_sock < 0) {
3861 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3862 ret = -1;
3863 goto end;
3864 }
3865
3866 /* File permission MUST be 660 */
3867 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3868 if (ret < 0) {
d6f42150 3869 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3870 perror("chmod");
3871 goto end;
3872 }
3873
3874 /* Create the application unix socket */
d6f42150
DG		 3875 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3876 if (apps_sock < 0) {
3877 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3878 ret = -1;
3879 goto end;
3880 }
3881
d6f42150 3882 /* File permission MUST be 666 */
54d01ffb
DG		 3883 ret = chmod(apps_unix_sock_path,
3884 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3885 if (ret < 0) {
d6f42150 3886 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3887 perror("chmod");
3888 goto end;
3889 }
3890
3891end:
3892 umask(old_umask);
3893 return ret;
3894}
3895
3896/*
54d01ffb
DG		 3897 * Check if the global socket is available, and if a daemon is answering at the
3898 * other side. If yes, error is returned.
fac6795d 3899 */
cf3af59e 3900static int check_existing_daemon(void)
fac6795d 3901{
7d8234d9 3902 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3903 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3904 return 0;
099e26bd 3905 }
54d01ffb 3906
7d8234d9 3907 /* Is there anybody out there ? */
099e26bd 3908 if (lttng_session_daemon_alive()) {
7d8234d9 3909 return -EEXIST;
099e26bd 3910 } else {
7d8234d9 3911 return 0;
099e26bd 3912 }
fac6795d
DG		 3913}
3914
fac6795d 3915/*
d063d709 3916 * Set the tracing group gid onto the client socket.
5e16da05 3917 *
d063d709
DG		 3918 * Race window between mkdir and chown is OK because we are going from more
3919 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3920 */
d6f42150 3921static int set_permissions(void)
fac6795d
DG		 3922{
3923 int ret;
996b65c8 3924 gid_t gid;
fac6795d 3925
996b65c8
MD		 3926 gid = allowed_group();
3927 if (gid < 0) {
a463f419
DG		 3928 if (is_root) {
3929 WARN("No tracing group detected");
3930 ret = 0;
3931 } else {
3932 ERR("Missing tracing group. Aborting execution.");
3933 ret = -1;
3934 }
fac6795d
DG		 3935 goto end;
3936 }
3937
d6f42150 3938 /* Set lttng run dir */
996b65c8 3939 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG		 3940 if (ret < 0) {
3941 ERR("Unable to set group on " LTTNG_RUNDIR);
3942 perror("chown");
3943 }
3944
3945 /* lttng client socket path */
996b65c8 3946 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3947 if (ret < 0) {
d6f42150
DG		 3948 ERR("Unable to set group on %s", client_unix_sock_path);
3949 perror("chown");
3950 }
3951
3bd1e081
MD		 3952 /* kconsumer error socket path */
3953 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3954 if (ret < 0) {
3bd1e081
MD		 3955 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3956 perror("chown");
3957 }
3958
7753dea8
MD		 3959 /* 64-bit ustconsumer error socket path */
3960 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3961 if (ret < 0) {
3962 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3963 perror("chown");
3964 }
3965
3966 /* 32-bit ustconsumer compat32 error socket path */
3967 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3968 if (ret < 0) {
7753dea8 3969 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 3970 perror("chown");
3971 }
3972
d6f42150 3973 DBG("All permissions are set");
e07ae692 3974
fac6795d
DG		 3975end:
3976 return ret;
3977}
3978
7a485870 3979/*
d063d709 3980 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3981 */
3982static int create_kernel_poll_pipe(void)
3983{
3984 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3985}
3986
099e26bd
DG		 3987/*
3988 * Create the application command pipe to wake thread_manage_apps.
3989 */
3990static int create_apps_cmd_pipe(void)
3991{
3992 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3993}
3994
d6f42150 3995/*
d063d709 3996 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG		 3997 */
3998static int create_lttng_rundir(void)
3999{
4000 int ret;
4001
4002 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4003 if (ret < 0) {
b1f11e69
DG		 4004 if (errno != EEXIST) {
4005 ERR("Unable to create " LTTNG_RUNDIR);
4006 goto error;
4007 } else {
4008 ret = 0;
4009 }
d6f42150
DG		 4010 }
4011
4012error:
4013 return ret;
4014}
4015
4016/*
d063d709
DG		 4017 * Setup sockets and directory needed by the kconsumerd communication with the
4018 * session daemon.
d6f42150 4019 */
3bd1e081 4020static int set_consumer_sockets(struct consumer_data *consumer_data)
d6f42150
DG		 4021{
4022 int ret;
7753dea8 4023 const char *path;
d6f42150 4024
7753dea8
MD		 4025 switch (consumer_data->type) {
4026 case LTTNG_CONSUMER_KERNEL:
4027 path = KCONSUMERD_PATH;
4028 break;
4029 case LTTNG_CONSUMER64_UST:
4030 path = USTCONSUMERD64_PATH;
4031 break;
4032 case LTTNG_CONSUMER32_UST:
4033 path = USTCONSUMERD32_PATH;
4034 break;
4035 default:
4036 ERR("Consumer type unknown");
4037 ret = -EINVAL;
4038 goto error;
d6f42150
DG		 4039 }
4040
3bd1e081 4041 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4042 if (ret < 0) {
6beb2242 4043 if (errno != EEXIST) {
3bd1e081 4044 ERR("Failed to create %s", path);
6beb2242
DG		 4045 goto error;
4046 }
4047 ret = 0;
d6f42150
DG		 4048 }
4049
4050 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4051 consumer_data->err_sock =
4052 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4053 if (consumer_data->err_sock < 0) {
4054 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4055 ret = -1;
4056 goto error;
4057 }
4058
4059 /* File permission MUST be 660 */
3bd1e081 4060 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4061 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4062 if (ret < 0) {
3bd1e081 4063 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4064 perror("chmod");
4065 goto error;
4066 }
4067
4068error:
4069 return ret;
4070}
4071
fac6795d 4072/*
d063d709 4073 * Signal handler for the daemon
cf3af59e 4074 *
54d01ffb
DG		 4075 * Simply stop all worker threads, leaving main() return gracefully after
4076 * joining all threads and calling cleanup().
fac6795d
DG		 4077 */
4078static void sighandler(int sig)
4079{
4080 switch (sig) {
cf3af59e
MD		 4081 case SIGPIPE:
4082 DBG("SIGPIPE catched");
4083 return;
4084 case SIGINT:
4085 DBG("SIGINT catched");
4086 stop_threads();
4087 break;
4088 case SIGTERM:
4089 DBG("SIGTERM catched");
4090 stop_threads();
4091 break;
4092 default:
4093 break;
fac6795d 4094 }
fac6795d
DG		 4095}
4096
4097/*
d063d709 4098 * Setup signal handler for :
1d4b027a 4099 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4100 */
1d4b027a 4101static int set_signal_handler(void)
fac6795d 4102{
1d4b027a
DG		 4103 int ret = 0;
4104 struct sigaction sa;
4105 sigset_t sigset;
fac6795d 4106
1d4b027a
DG		 4107 if ((ret = sigemptyset(&sigset)) < 0) {
4108 perror("sigemptyset");
4109 return ret;
4110 }
d6f42150 4111
1d4b027a
DG		 4112 sa.sa_handler = sighandler;
4113 sa.sa_mask = sigset;
4114 sa.sa_flags = 0;
4115 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4116 perror("sigaction");
4117 return ret;
d6f42150
DG		 4118 }
4119
1d4b027a
DG		 4120 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4121 perror("sigaction");
4122 return ret;
d6f42150 4123 }
aaf26714 4124
1d4b027a
DG		 4125 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4126 perror("sigaction");
4127 return ret;
8c0faa1d
DG		 4128 }
4129
1d4b027a
DG		 4130 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4131
4132 return ret;
fac6795d
DG		 4133}
4134
f3ed775e 4135/*
d063d709
DG		 4136 * Set open files limit to unlimited. This daemon can open a large number of
4137 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4138 */
4139static void set_ulimit(void)
4140{
4141 int ret;
4142 struct rlimit lim;
4143
a88df331 4144 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4145 lim.rlim_cur = 65535;
4146 lim.rlim_max = 65535;
4147
4148 ret = setrlimit(RLIMIT_NOFILE, &lim);
4149 if (ret < 0) {
4150 perror("failed to set open files limit");
4151 }
4152}
4153
fac6795d
DG		 4154/*
4155 * main
4156 */
4157int main(int argc, char **argv)
4158{
fac6795d
DG		 4159 int ret = 0;
4160 void *status;
b082db07 4161 const char *home_path;
fac6795d 4162
f6a9efaa
DG		 4163 rcu_register_thread();
4164
273ea72c 4165 /* Create thread quit pipe */
cf3af59e
MD		 4166 if ((ret = init_thread_quit_pipe()) < 0) {
4167 goto error;
273ea72c
DG		 4168 }
4169
7753dea8 4170 setup_consumerd_path();
fb09408a 4171
fac6795d
DG		 4172 /* Parse arguments */
4173 progname = argv[0];
4174 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4175 goto error;
fac6795d
DG		 4176 }
4177
4178 /* Daemonize */
4179 if (opt_daemon) {
53094c05
DG		 4180 ret = daemon(0, 0);
4181 if (ret < 0) {
4182 perror("daemon");
cf3af59e 4183 goto error;
53094c05 4184 }
fac6795d
DG		 4185 }
4186
4187 /* Check if daemon is UID = 0 */
4188 is_root = !getuid();
4189
fac6795d 4190 if (is_root) {
d6f42150
DG		 4191 ret = create_lttng_rundir();
4192 if (ret < 0) {
cf3af59e 4193 goto error;
d6f42150
DG		 4194 }
4195
fac6795d 4196 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4197 snprintf(apps_unix_sock_path, PATH_MAX,
4198 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4199 }
4200
4201 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4202 snprintf(client_unix_sock_path, PATH_MAX,
4203 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4204 }
0fdd1e2c
DG		 4205
4206 /* Set global SHM for ust */
4207 if (strlen(wait_shm_path) == 0) {
4208 snprintf(wait_shm_path, PATH_MAX,
4209 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4210 }
fac6795d 4211 } else {
b082db07
DG		 4212 home_path = get_home_dir();
4213 if (home_path == NULL) {
273ea72c
DG		 4214 /* TODO: Add --socket PATH option */
4215 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4216 ret = -EPERM;
4217 goto error;
b082db07
DG		 4218 }
4219
fac6795d 4220 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4221 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4222 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4223 }
4224
4225 /* Set the cli tool unix socket path */
4226 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4227 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4228 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4229 }
0fdd1e2c
DG		 4230
4231 /* Set global SHM for ust */
4232 if (strlen(wait_shm_path) == 0) {
4233 snprintf(wait_shm_path, PATH_MAX,
4234 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4235 }
fac6795d
DG		 4236 }
4237
847177cd
DG		 4238 DBG("Client socket path %s", client_unix_sock_path);
4239 DBG("Application socket path %s", apps_unix_sock_path);
4240
273ea72c 4241 /*
7d8234d9 4242 * See if daemon already exist.
fac6795d 4243 */
7d8234d9 4244 if ((ret = check_existing_daemon()) < 0) {
75462a81 4245 ERR("Already running daemon.\n");
273ea72c 4246 /*
cf3af59e
MD		 4247 * We do not goto exit because we must not cleanup()
4248 * because a daemon is already running.
ab118b20 4249 */
cf3af59e 4250 goto error;
a88df331
DG		 4251 }
4252
54d01ffb 4253 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4254
4255 /*
4256 * These actions must be executed as root. We do that *after* setting up
4257 * the sockets path because we MUST make the check for another daemon using
4258 * those paths *before* trying to set the kernel consumer sockets and init
4259 * kernel tracer.
4260 */
4261 if (is_root) {
3bd1e081
MD		 4262 ret = set_consumer_sockets(&kconsumer_data);
4263 if (ret < 0) {
4264 goto exit;
4265 }
48842b30 4266
7753dea8 4267 ret = set_consumer_sockets(&ustconsumer64_data);
a88df331 4268 if (ret < 0) {
cf3af59e 4269 goto exit;
a88df331 4270 }
7753dea8
MD		 4271
4272 ret = set_consumer_sockets(&ustconsumer32_data);
4273 if (ret < 0) {
4274 goto exit;
4275 }
4276
a88df331
DG		 4277 /* Setup kernel tracer */
4278 init_kernel_tracer();
4279
4280 /* Set ulimit for open files */
4281 set_ulimit();
fac6795d
DG		 4282 }
4283
cf3af59e
MD		 4284 if ((ret = set_signal_handler()) < 0) {
4285 goto exit;
fac6795d
DG		 4286 }
4287
d6f42150 4288 /* Setup the needed unix socket */
cf3af59e
MD		 4289 if ((ret = init_daemon_socket()) < 0) {
4290 goto exit;
fac6795d
DG		 4291 }
4292
4293 /* Set credentials to socket */
cf3af59e
MD		 4294 if (is_root && ((ret = set_permissions()) < 0)) {
4295 goto exit;
fac6795d
DG		 4296 }
4297
5b8719f5
DG		 4298 /* Get parent pid if -S, --sig-parent is specified. */
4299 if (opt_sig_parent) {
4300 ppid = getppid();
4301 }
4302
7a485870 4303 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4304 if ((ret = create_kernel_poll_pipe()) < 0) {
4305 goto exit;
7a485870
DG		 4306 }
4307
099e26bd
DG		 4308 /* Setup the thread apps communication pipe. */
4309 if ((ret = create_apps_cmd_pipe()) < 0) {
4310 goto exit;
4311 }
4312
4313 /* Init UST command queue. */
4314 cds_wfq_init(&ust_cmd_queue.queue);
4315
f6a9efaa
DG		 4316 /* Init UST app hash table */
4317 ust_app_ht_alloc();
4318
273ea72c 4319 /*
54d01ffb
DG		 4320 * Get session list pointer. This pointer MUST NOT be free(). This list is
4321 * statically declared in session.c
273ea72c 4322 */
54d01ffb 4323 session_list_ptr = session_get_list();
b5541356 4324
5eb91c98
DG		 4325 /* Set up max poll set size */
4326 lttng_poll_set_max_size();
4327
cf3af59e 4328 /* Create thread to manage the client socket */
099e26bd
DG		 4329 ret = pthread_create(&client_thread, NULL,
4330 thread_manage_clients, (void *) NULL);
cf3af59e 4331 if (ret != 0) {
099e26bd 4332 perror("pthread_create clients");
cf3af59e
MD		 4333 goto exit_client;
4334 }
fac6795d 4335
099e26bd
DG		 4336 /* Create thread to dispatch registration */
4337 ret = pthread_create(&dispatch_thread, NULL,
4338 thread_dispatch_ust_registration, (void *) NULL);
4339 if (ret != 0) {
4340 perror("pthread_create dispatch");
4341 goto exit_dispatch;
4342 }
4343
4344 /* Create thread to manage application registration. */
4345 ret = pthread_create(&reg_apps_thread, NULL,
4346 thread_registration_apps, (void *) NULL);
4347 if (ret != 0) {
4348 perror("pthread_create registration");
4349 goto exit_reg_apps;
4350 }
4351
cf3af59e 4352 /* Create thread to manage application socket */
54d01ffb
DG		 4353 ret = pthread_create(&apps_thread, NULL,
4354 thread_manage_apps, (void *) NULL);
cf3af59e 4355 if (ret != 0) {
099e26bd 4356 perror("pthread_create apps");
cf3af59e
MD		 4357 goto exit_apps;
4358 }
fac6795d 4359
cf3af59e 4360 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4361 ret = pthread_create(&kernel_thread, NULL,
4362 thread_manage_kernel, (void *) NULL);
cf3af59e 4363 if (ret != 0) {
099e26bd 4364 perror("pthread_create kernel");
cf3af59e
MD		 4365 goto exit_kernel;
4366 }
7a485870 4367
cf3af59e
MD		 4368 ret = pthread_join(kernel_thread, &status);
4369 if (ret != 0) {
4370 perror("pthread_join");
4371 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4372 }
4373
cf3af59e
MD		 4374exit_kernel:
4375 ret = pthread_join(apps_thread, &status);
4376 if (ret != 0) {
4377 perror("pthread_join");
4378 goto error; /* join error, exit without cleanup */
4379 }
fac6795d 4380
cf3af59e 4381exit_apps:
099e26bd
DG		 4382 ret = pthread_join(reg_apps_thread, &status);
4383 if (ret != 0) {
4384 perror("pthread_join");
4385 goto error; /* join error, exit without cleanup */
4386 }
4387
4388exit_reg_apps:
4389 ret = pthread_join(dispatch_thread, &status);
4390 if (ret != 0) {
4391 perror("pthread_join");
4392 goto error; /* join error, exit without cleanup */
4393 }
4394
4395exit_dispatch:
cf3af59e
MD		 4396 ret = pthread_join(client_thread, &status);
4397 if (ret != 0) {
4398 perror("pthread_join");
4399 goto error; /* join error, exit without cleanup */
4400 }
4401
3bd1e081 4402 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4403 if (ret != 0) {
3bd1e081 4404 perror("join_consumer");
cf3af59e
MD		 4405 goto error; /* join error, exit without cleanup */
4406 }
a88df331 4407
cf3af59e 4408exit_client:
a88df331 4409exit:
cf3af59e
MD		 4410 /*
4411 * cleanup() is called when no other thread is running.
4412 */
f6a9efaa 4413 rcu_thread_online();
cf3af59e 4414 cleanup();
f6a9efaa
DG		 4415 rcu_thread_offline();
4416 rcu_unregister_thread();
cf3af59e
MD		 4417 if (!ret)
4418 exit(EXIT_SUCCESS);
4419error:
5e16da05 4420 exit(EXIT_FAILURE);
fac6795d 4421}
LTTng 2.0 tools and control repository
This page took 0.274176 seconds and 4 git commands to generate.