Fix: sessiond app listening: use posix-compliant poll flags
[lttng-tools.git] / src / bin / 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
ca4537d3 20#include <fcntl.h>
fac6795d
DG
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
990570ed 41#include <common/common.h>
0ba98ebc 42#include <common/compat/poll.h>
db758600
DG
43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD
58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
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101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_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
fb6f1fa2
YB
174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD
178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD
207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD
225 }
226}
227
5eb91c98
DG
228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG
272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD
275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
ca4537d3 298 int ret;
273ea72c 299
ca4537d3 300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
273ea72c 301 if (ret < 0) {
ca4537d3 302 perror("thread quit pipe");
273ea72c
DG
303 goto error;
304 }
305
306error:
307 return ret;
308}
309
fac6795d 310/*
d063d709
DG
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
fac6795d 313 */
1d4b027a 314static void teardown_kernel_session(struct ltt_session *session)
fac6795d 315{
8f7a84dd 316 if (!session->kernel_session) {
99bab54f 317 DBG3("No kernel session when tearing down session");
84ea9c99 318 return;
8f7a84dd
DG
319 }
320
84ea9c99 321 DBG("Tearing down kernel session");
d9800920 322
84ea9c99
MD
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 329 }
84ea9c99
MD
330
331 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
332}
333
f6a9efaa
DG
334/*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338static void teardown_ust_session(struct ltt_session *session)
339{
84cd17c6
MD
340 int ret;
341
8f7a84dd 342 if (!session->ust_session) {
99bab54f 343 DBG3("No UST session when tearing down session");
f470a390 344 return;
8f7a84dd
DG
345 }
346
84ea9c99 347 DBG("Tearing down UST session(s)");
8f7a84dd 348
84cd17c6
MD
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
8f7a84dd 353
f6a9efaa
DG
354 trace_ust_destroy_session(session->ust_session);
355}
356
099e26bd
DG
357/*
358 * Stop all threads by closing the thread quit pipe.
359 */
cf3af59e
MD
360static void stop_threads(void)
361{
5eb91c98
DG
362 int ret;
363
cf3af59e
MD
364 /* Stopping all threads */
365 DBG("Terminating all threads");
54d01ffb 366 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
099e26bd
DG
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
374}
375
fac6795d 376/*
d063d709 377 * Cleanup the daemon
fac6795d 378 */
cf3af59e 379static void cleanup(void)
fac6795d 380{
1d4b027a
DG
381 int ret;
382 char *cmd;
af9737e9 383 struct ltt_session *sess, *stmp;
fac6795d 384
1d4b027a 385 DBG("Cleaning up");
e07ae692 386
67e40797
DG
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
5461b305 392
67e40797
DG
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
1d4b027a 397 }
67e40797 398 free(cmd);
5461b305 399
99bab54f 400 DBG("Cleaning up all sessions");
fac6795d 401
b5541356 402 /* Destroy session list mutex */
273ea72c
DG
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
54d01ffb
DG
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
273ea72c 409 teardown_kernel_session(sess);
f6a9efaa
DG
410 teardown_ust_session(sess);
411 free(sess);
273ea72c
DG
412 }
413 }
414
099e26bd 415 DBG("Closing all UST sockets");
56fff090 416 ust_app_clean_list();
099e26bd 417
3bd1e081 418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 419
4fba7219
DG
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
2f50c8a3 423 DBG("Unloading kernel modules");
096102bd 424 modprobe_remove_lttng_all();
2f50c8a3 425 }
5eb91c98
DG
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
421cb601
DG
429
430 /* <fun> */
f56a39af 431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
fac6795d
DG
435}
436
e065084a 437/*
d063d709 438 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 439 *
d063d709 440 * Return lttcomm error code.
e065084a
DG
441 */
442static int send_unix_sock(int sock, void *buf, size_t len)
443{
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450}
451
5461b305 452/*
d063d709 453 * Free memory of a command context structure.
5461b305 454 */
a2fb29a5 455static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 456{
a2fb29a5
DG
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
5461b305 461 }
a2fb29a5
DG
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
5461b305 464 }
a2fb29a5
DG
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
5461b305
DG
467 }
468}
469
f3ed775e 470/*
d063d709 471 * Send all stream fds of kernel channel to the consumer.
f3ed775e 472 */
2bdd86d4 473static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
f3ed775e
DG
476{
477 int ret;
f3ed775e 478 struct ltt_kernel_stream *stream;
3bd1e081 479 struct lttcomm_consumer_msg lkm;
f3ed775e 480
3bd1e081 481 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 482 channel->channel->name);
f3ed775e 483
3bd1e081
MD
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 491 if (ret < 0) {
3bd1e081 492 perror("send consumer channel");
f3ed775e
DG
493 goto error;
494 }
495
3bd1e081 496 /* Send streams */
7a485870 497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
3bd1e081
MD
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
f3ed775e
DG
521 }
522 }
523
3bd1e081 524 DBG("consumer channel streams sent");
f3ed775e
DG
525
526 return 0;
527
528error:
529 return ret;
530}
531
532/*
d063d709 533 * Send all stream fds of the kernel session to the consumer.
f3ed775e 534 */
2bdd86d4 535static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 536 struct ltt_kernel_session *session)
f3ed775e
DG
537{
538 int ret;
539 struct ltt_kernel_channel *chan;
3bd1e081
MD
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
7a485870
DG
542
543 DBG("Sending metadata stream fd");
544
2bdd86d4 545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 546 if (session->consumer_fd == 0) {
3bd1e081 547 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
548 }
549
7a485870 550 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
3bd1e081
MD
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 581 if (ret < 0) {
3bd1e081 582 perror("send consumer stream");
7a485870
DG
583 goto error;
584 }
585 }
f3ed775e 586
f3ed775e 587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
2bdd86d4
MD
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599error:
600 return ret;
601}
602
fac6795d 603/*
0fdd1e2c 604 * Notify UST applications using the shm mmap futex.
fac6795d 605 */
0fdd1e2c 606static int notify_ust_apps(int active)
fac6795d 607{
0fdd1e2c 608 char *wait_shm_mmap;
fac6795d 609
0fdd1e2c 610 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 611
0fdd1e2c
DG
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
fac6795d
DG
615 goto error;
616 }
617
0fdd1e2c
DG
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
fac6795d
DG
623
624error:
0fdd1e2c 625 return -1;
fac6795d
DG
626}
627
e065084a 628/*
d063d709
DG
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
ca95a216 632 *
d063d709 633 * Return total size of the buffer pointed by buf.
ca95a216 634 */
5461b305 635static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 636{
f3ed775e 637 int ret, buf_size;
ca95a216 638
f3ed775e 639 buf_size = size;
5461b305 640
ba7f0ae5 641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 642 if (cmd_ctx->llm == NULL) {
ba7f0ae5 643 perror("zmalloc");
5461b305 644 ret = -ENOMEM;
ca95a216
DG
645 goto error;
646 }
647
5461b305
DG
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 651
5461b305
DG
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
ca95a216
DG
655 return buf_size;
656
657error:
658 return ret;
659}
660
7a485870 661/*
5eb91c98 662 * Update the kernel poll set of all channel fd available over all tracing
d063d709 663 * session. Add the wakeup pipe at the end of the set.
7a485870 664 */
5eb91c98 665static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 666{
5eb91c98 667 int ret;
7a485870
DG
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
5eb91c98 671 DBG("Updating kernel poll set");
7a485870 672
54d01ffb 673 session_lock_list();
b5541356 674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 675 session_lock(session);
7a485870 676 if (session->kernel_session == NULL) {
54d01ffb 677 session_unlock(session);
7a485870
DG
678 continue;
679 }
7a485870 680
54d01ffb
DG
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
54d01ffb 686 session_unlock(session);
5eb91c98
DG
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 690 }
54d01ffb 691 session_unlock(session);
7a485870 692 }
54d01ffb 693 session_unlock_list();
7a485870 694
5eb91c98 695 return 0;
7a485870
DG
696
697error:
54d01ffb 698 session_unlock_list();
7a485870
DG
699 return -1;
700}
701
702/*
54d01ffb 703 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 704 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 705 *
d063d709 706 * Useful for CPU hotplug feature.
7a485870 707 */
2bdd86d4 708static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
709{
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
54d01ffb 716 session_lock_list();
b5541356 717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 718 session_lock(session);
7a485870 719 if (session->kernel_session == NULL) {
54d01ffb 720 session_unlock(session);
7a485870
DG
721 continue;
722 }
d9800920
DG
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
727 }
728
5eb91c98
DG
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
7a485870
DG
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
b3c750d2 735 goto error;
7a485870 736 }
d9800920 737
7a485870 738 /*
5eb91c98
DG
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
7a485870 742 */
3bd1e081 743 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 744 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
7a485870 747 if (ret < 0) {
b3c750d2 748 goto error;
7a485870
DG
749 }
750 }
b3c750d2 751 goto error;
7a485870
DG
752 }
753 }
54d01ffb 754 session_unlock(session);
7a485870 755 }
54d01ffb 756 session_unlock_list();
b3c750d2 757 return ret;
7a485870 758
b3c750d2 759error:
54d01ffb
DG
760 session_unlock(session);
761 session_unlock_list();
7a485870
DG
762 return ret;
763}
764
487cf67c
DG
765/*
766 * For each tracing session, update newly registered apps.
767 */
768static void update_ust_app(int app_sock)
769{
770 struct ltt_session *sess, *stmp;
771
4ee14516
DG
772 session_lock_list();
773
487cf67c
DG
774 /* For all tracing session(s) */
775 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 776 session_lock(sess);
421cb601
DG
777 if (sess->ust_session) {
778 ust_app_global_update(sess->ust_session, app_sock);
779 }
4ee14516 780 session_unlock(sess);
487cf67c 781 }
4ee14516
DG
782
783 session_unlock_list();
487cf67c
DG
784}
785
7a485870 786/*
d063d709 787 * This thread manage event coming from the kernel.
7a485870 788 *
d063d709
DG
789 * Features supported in this thread:
790 * -) CPU Hotplug
7a485870
DG
791 */
792static void *thread_manage_kernel(void *data)
793{
5eb91c98
DG
794 int ret, i, pollfd, update_poll_flag = 1;
795 uint32_t revents, nb_fd;
7a485870 796 char tmp;
5eb91c98 797 struct lttng_poll_event events;
7a485870
DG
798
799 DBG("Thread manage kernel started");
800
5eb91c98
DG
801 ret = create_thread_poll_set(&events, 2);
802 if (ret < 0) {
803 goto error;
804 }
805
806 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
807 if (ret < 0) {
808 goto error;
809 }
810
7a485870
DG
811 while (1) {
812 if (update_poll_flag == 1) {
5f822d0a
DG
813 /*
814 * Reset number of fd in the poll set. Always 2 since there is the thread
815 * quit pipe and the kernel pipe.
816 */
817 events.nb_fd = 2;
818
5eb91c98
DG
819 ret = update_kernel_poll(&events);
820 if (ret < 0) {
7a485870
DG
821 goto error;
822 }
823 update_poll_flag = 0;
824 }
825
5eb91c98
DG
826 nb_fd = LTTNG_POLL_GETNB(&events);
827
828 DBG("Thread kernel polling on %d fds", nb_fd);
829
830 /* Zeroed the poll events */
831 lttng_poll_reset(&events);
7a485870
DG
832
833 /* Poll infinite value of time */
a8b0b341 834 restart:
5eb91c98 835 ret = lttng_poll_wait(&events, -1);
7a485870 836 if (ret < 0) {
a8b0b341
MD
837 /*
838 * Restart interrupted system call.
839 */
840 if (errno == EINTR) {
841 goto restart;
842 }
7a485870
DG
843 goto error;
844 } else if (ret == 0) {
845 /* Should not happen since timeout is infinite */
85611738
DG
846 ERR("Return value of poll is 0 with an infinite timeout.\n"
847 "This should not have happened! Continuing...");
7a485870
DG
848 continue;
849 }
850
5eb91c98
DG
851 for (i = 0; i < nb_fd; i++) {
852 /* Fetch once the poll data */
853 revents = LTTNG_POLL_GETEV(&events, i);
854 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 855
5eb91c98
DG
856 /* Thread quit pipe has been closed. Killing thread. */
857 ret = check_thread_quit_pipe(pollfd, revents);
858 if (ret) {
859 goto error;
860 }
7a485870 861
5eb91c98
DG
862 /* Check for data on kernel pipe */
863 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
864 ret = read(kernel_poll_pipe[0], &tmp, 1);
865 update_poll_flag = 1;
866 continue;
867 } else {
868 /*
869 * New CPU detected by the kernel. Adding kernel stream to
870 * kernel session and updating the kernel consumer
871 */
872 if (revents & LPOLLIN) {
2bdd86d4 873 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
874 if (ret < 0) {
875 continue;
876 }
877 break;
878 /*
879 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
880 * and unregister kernel stream at this point.
881 */
7a485870 882 }
7a485870
DG
883 }
884 }
885 }
886
887error:
888 DBG("Kernel thread dying");
273ea72c
DG
889 close(kernel_poll_pipe[0]);
890 close(kernel_poll_pipe[1]);
5eb91c98
DG
891
892 lttng_poll_clean(&events);
893
7a485870
DG
894 return NULL;
895}
896
1d4b027a 897/*
3bd1e081 898 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 899 */
3bd1e081 900static void *thread_manage_consumer(void *data)
1d4b027a 901{
5eb91c98
DG
902 int sock = 0, i, ret, pollfd;
903 uint32_t revents, nb_fd;
1d4b027a 904 enum lttcomm_return_code code;
5eb91c98 905 struct lttng_poll_event events;
3bd1e081 906 struct consumer_data *consumer_data = data;
1d4b027a 907
3bd1e081 908 DBG("[thread] Manage consumer started");
1d4b027a 909
3bd1e081 910 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
911 if (ret < 0) {
912 goto error;
913 }
914
5eb91c98
DG
915 /*
916 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
917 * Nothing more will be added to this poll set.
918 */
919 ret = create_thread_poll_set(&events, 2);
920 if (ret < 0) {
921 goto error;
922 }
273ea72c 923
3bd1e081 924 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
925 if (ret < 0) {
926 goto error;
927 }
928
929 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
930
931 /* Inifinite blocking call, waiting for transmission */
a8b0b341 932restart:
5eb91c98 933 ret = lttng_poll_wait(&events, -1);
273ea72c 934 if (ret < 0) {
a8b0b341
MD
935 /*
936 * Restart interrupted system call.
937 */
938 if (errno == EINTR) {
939 goto restart;
940 }
273ea72c
DG
941 goto error;
942 }
943
5eb91c98
DG
944 for (i = 0; i < nb_fd; i++) {
945 /* Fetch once the poll data */
946 revents = LTTNG_POLL_GETEV(&events, i);
947 pollfd = LTTNG_POLL_GETFD(&events, i);
948
949 /* Thread quit pipe has been closed. Killing thread. */
950 ret = check_thread_quit_pipe(pollfd, revents);
951 if (ret) {
952 goto error;
953 }
954
955 /* Event on the registration socket */
3bd1e081 956 if (pollfd == consumer_data->err_sock) {
5eb91c98 957 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 958 ERR("consumer err socket poll error");
5eb91c98
DG
959 goto error;
960 }
961 }
273ea72c
DG
962 }
963
3bd1e081 964 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
965 if (sock < 0) {
966 goto error;
967 }
968
3bd1e081 969 DBG2("Receiving code from consumer err_sock");
ee0b0061 970
712ea556 971 /* Getting status code from kconsumerd */
54d01ffb
DG
972 ret = lttcomm_recv_unix_sock(sock, &code,
973 sizeof(enum lttcomm_return_code));
1d4b027a
DG
974 if (ret <= 0) {
975 goto error;
976 }
977
3bd1e081
MD
978 if (code == CONSUMERD_COMMAND_SOCK_READY) {
979 consumer_data->cmd_sock =
980 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
981 if (consumer_data->cmd_sock < 0) {
982 sem_post(&consumer_data->sem);
48842b30 983 PERROR("consumer connect");
1d4b027a
DG
984 goto error;
985 }
986 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
987 sem_post(&consumer_data->sem);
988 DBG("consumer command socket ready");
1d4b027a 989 } else {
3bd1e081 990 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
991 lttcomm_get_readable_code(-code));
992 goto error;
993 }
994
54d01ffb 995 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 996 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 997 if (ret < 0) {
72079cae
DG
998 goto error;
999 }
1000
5eb91c98
DG
1001 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1002 if (ret < 0) {
72079cae 1003 goto error;
5eb91c98
DG
1004 }
1005
1006 /* Update number of fd */
1007 nb_fd = LTTNG_POLL_GETNB(&events);
1008
1009 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1010restart_poll:
5eb91c98
DG
1011 ret = lttng_poll_wait(&events, -1);
1012 if (ret < 0) {
a8b0b341
MD
1013 /*
1014 * Restart interrupted system call.
1015 */
1016 if (errno == EINTR) {
1017 goto restart_poll;
1018 }
72079cae
DG
1019 goto error;
1020 }
1021
5eb91c98
DG
1022 for (i = 0; i < nb_fd; i++) {
1023 /* Fetch once the poll data */
1024 revents = LTTNG_POLL_GETEV(&events, i);
1025 pollfd = LTTNG_POLL_GETFD(&events, i);
1026
1027 /* Thread quit pipe has been closed. Killing thread. */
1028 ret = check_thread_quit_pipe(pollfd, revents);
1029 if (ret) {
1030 goto error;
1031 }
1032
1033 /* Event on the kconsumerd socket */
1034 if (pollfd == sock) {
1035 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1036 ERR("consumer err socket second poll error");
5eb91c98
DG
1037 goto error;
1038 }
1039 }
1040 }
1041
712ea556 1042 /* Wait for any kconsumerd error */
54d01ffb
DG
1043 ret = lttcomm_recv_unix_sock(sock, &code,
1044 sizeof(enum lttcomm_return_code));
712ea556 1045 if (ret <= 0) {
3bd1e081 1046 ERR("consumer closed the command socket");
712ea556 1047 goto error;
6f61d021 1048 }
1d4b027a 1049
3bd1e081 1050 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1051
1d4b027a 1052error:
3bd1e081
MD
1053 DBG("consumer thread dying");
1054 close(consumer_data->err_sock);
1055 close(consumer_data->cmd_sock);
5eb91c98 1056 close(sock);
273ea72c 1057
3bd1e081
MD
1058 unlink(consumer_data->err_unix_sock_path);
1059 unlink(consumer_data->cmd_unix_sock_path);
1060 consumer_data->pid = 0;
1d4b027a 1061
5eb91c98 1062 lttng_poll_clean(&events);
0177d773 1063
5eb91c98 1064 return NULL;
099e26bd
DG
1065}
1066
099e26bd
DG
1067/*
1068 * This thread manage application communication.
1d4b027a
DG
1069 */
1070static void *thread_manage_apps(void *data)
099e26bd 1071{
5eb91c98
DG
1072 int i, ret, pollfd;
1073 uint32_t revents, nb_fd;
099e26bd 1074 struct ust_command ust_cmd;
5eb91c98 1075 struct lttng_poll_event events;
099e26bd
DG
1076
1077 DBG("[thread] Manage application started");
1078
f6a9efaa
DG
1079 rcu_register_thread();
1080 rcu_thread_online();
1081
5eb91c98
DG
1082 ret = create_thread_poll_set(&events, 2);
1083 if (ret < 0) {
1084 goto error;
1085 }
099e26bd 1086
5eb91c98
DG
1087 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1088 if (ret < 0) {
1089 goto error;
1090 }
099e26bd 1091
5eb91c98
DG
1092 while (1) {
1093 /* Zeroed the events structure */
1094 lttng_poll_reset(&events);
0177d773 1095
5eb91c98 1096 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1097
1098 DBG("Apps thread polling on %d fds", nb_fd);
1099
1100 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1101 restart:
5eb91c98 1102 ret = lttng_poll_wait(&events, -1);
099e26bd 1103 if (ret < 0) {
a8b0b341
MD
1104 /*
1105 * Restart interrupted system call.
1106 */
1107 if (errno == EINTR) {
1108 goto restart;
1109 }
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 1146 /*
e0c7ec2b 1147 * Validate UST version compatibility.
acc7b41b 1148 */
e0c7ec2b
DG
1149 ret = ust_app_validate_version(ust_cmd.sock);
1150 if (ret >= 0) {
1151 /*
1152 * Add channel(s) and event(s) to newly registered apps
1153 * from lttng global UST domain.
1154 */
1155 update_ust_app(ust_cmd.sock);
1156 }
acc7b41b 1157
f2ca2e25 1158 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1159 if (ret < 0) {
1160 /*
1161 * If the registration is not possible, we simply
1162 * unregister the apps and continue
1163 */
56fff090 1164 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1165 } else {
1166 /*
1167 * We just need here to monitor the close of the UST
1168 * socket and poll set monitor those by default.
ab08a675
MD
1169 * Listen on POLLIN (even if we never expect any
1170 * data) to ensure that hangup wakes us.
5eb91c98 1171 */
ab08a675 1172 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1173 if (ret < 0) {
1174 goto error;
1175 }
1176
54d01ffb
DG
1177 DBG("Apps with sock %d added to poll set",
1178 ust_cmd.sock);
5eb91c98 1179 }
487cf67c 1180
5eb91c98 1181 break;
0177d773 1182 }
5eb91c98
DG
1183 } else {
1184 /*
54d01ffb
DG
1185 * At this point, we know that a registered application made
1186 * the event at poll_wait.
5eb91c98
DG
1187 */
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 /* Removing from the poll set */
1190 ret = lttng_poll_del(&events, pollfd);
1191 if (ret < 0) {
1192 goto error;
1193 }
099e26bd 1194
b9d9b220 1195 /* Socket closed on remote end. */
56fff090 1196 ust_app_unregister(pollfd);
5eb91c98
DG
1197 break;
1198 }
099e26bd
DG
1199 }
1200 }
099e26bd
DG
1201 }
1202
1203error:
1204 DBG("Application communication apps dying");
1205 close(apps_cmd_pipe[0]);
1206 close(apps_cmd_pipe[1]);
1207
5eb91c98 1208 lttng_poll_clean(&events);
099e26bd 1209
f6a9efaa
DG
1210 rcu_thread_offline();
1211 rcu_unregister_thread();
099e26bd
DG
1212 return NULL;
1213}
1214
1215/*
1216 * Dispatch request from the registration threads to the application
1217 * communication thread.
1218 */
1219static void *thread_dispatch_ust_registration(void *data)
1220{
1221 int ret;
1222 struct cds_wfq_node *node;
1223 struct ust_command *ust_cmd = NULL;
1224
1225 DBG("[thread] Dispatch UST command started");
1226
1227 while (!dispatch_thread_exit) {
1228 /* Atomically prepare the queue futex */
1229 futex_nto1_prepare(&ust_cmd_queue.futex);
1230
1231 do {
1232 /* Dequeue command for registration */
1233 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1234 if (node == NULL) {
00a17c97 1235 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1236 /* Continue thread execution */
1237 break;
1238 }
1239
1240 ust_cmd = caa_container_of(node, struct ust_command, node);
1241
2f50c8a3
DG
1242 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1243 " gid:%d sock:%d name:%s (version %d.%d)",
1244 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1245 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1246 ust_cmd->sock, ust_cmd->reg_msg.name,
1247 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1248 /*
1249 * Inform apps thread of the new application registration. This
1250 * call is blocking so we can be assured that the data will be read
1251 * at some point in time or wait to the end of the world :)
1252 */
1253 ret = write(apps_cmd_pipe[1], ust_cmd,
1254 sizeof(struct ust_command));
1255 if (ret < 0) {
1256 perror("write apps cmd pipe");
1257 if (errno == EBADF) {
1258 /*
1259 * We can't inform the application thread to process
1260 * registration. We will exit or else application
1261 * registration will not occur and tracing will never
1262 * start.
1263 */
1264 goto error;
1265 }
1266 }
1267 free(ust_cmd);
1268 } while (node != NULL);
1269
1270 /* Futex wait on queue. Blocking call on futex() */
1271 futex_nto1_wait(&ust_cmd_queue.futex);
1272 }
1273
1274error:
1275 DBG("Dispatch thread dying");
1276 return NULL;
1277}
1278
1279/*
1280 * This thread manage application registration.
1281 */
1282static void *thread_registration_apps(void *data)
1d4b027a 1283{
5eb91c98
DG
1284 int sock = 0, i, ret, pollfd;
1285 uint32_t revents, nb_fd;
1286 struct lttng_poll_event events;
099e26bd
DG
1287 /*
1288 * Get allocated in this thread, enqueued to a global queue, dequeued and
1289 * freed in the manage apps thread.
1290 */
1291 struct ust_command *ust_cmd = NULL;
1d4b027a 1292
099e26bd 1293 DBG("[thread] Manage application registration started");
1d4b027a
DG
1294
1295 ret = lttcomm_listen_unix_sock(apps_sock);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
5eb91c98
DG
1300 /*
1301 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1302 * more will be added to this poll set.
1303 */
1304 ret = create_thread_poll_set(&events, 2);
1305 if (ret < 0) {
1306 goto error;
1307 }
273ea72c 1308
5eb91c98
DG
1309 /* Add the application registration socket */
1310 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1311 if (ret < 0) {
1312 goto error;
1313 }
273ea72c 1314
1d4b027a 1315 /* Notify all applications to register */
0fdd1e2c
DG
1316 ret = notify_ust_apps(1);
1317 if (ret < 0) {
1318 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1319 "Execution continues but there might be problem for already\n"
1320 "running applications that wishes to register.");
0fdd1e2c 1321 }
1d4b027a
DG
1322
1323 while (1) {
1324 DBG("Accepting application registration");
273ea72c 1325
5eb91c98
DG
1326 nb_fd = LTTNG_POLL_GETNB(&events);
1327
273ea72c 1328 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1329 restart:
5eb91c98 1330 ret = lttng_poll_wait(&events, -1);
273ea72c 1331 if (ret < 0) {
a8b0b341
MD
1332 /*
1333 * Restart interrupted system call.
1334 */
1335 if (errno == EINTR) {
1336 goto restart;
1337 }
273ea72c
DG
1338 goto error;
1339 }
1340
5eb91c98
DG
1341 for (i = 0; i < nb_fd; i++) {
1342 /* Fetch once the poll data */
1343 revents = LTTNG_POLL_GETEV(&events, i);
1344 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1345
5eb91c98
DG
1346 /* Thread quit pipe has been closed. Killing thread. */
1347 ret = check_thread_quit_pipe(pollfd, revents);
1348 if (ret) {
90014c57
DG
1349 goto error;
1350 }
1d4b027a 1351
5eb91c98
DG
1352 /* Event on the registration socket */
1353 if (pollfd == apps_sock) {
1354 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1355 ERR("Register apps socket poll error");
1356 goto error;
1357 } else if (revents & LPOLLIN) {
1358 sock = lttcomm_accept_unix_sock(apps_sock);
1359 if (sock < 0) {
1360 goto error;
1361 }
099e26bd 1362
5eb91c98 1363 /* Create UST registration command for enqueuing */
ba7f0ae5 1364 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1365 if (ust_cmd == NULL) {
ba7f0ae5 1366 perror("ust command zmalloc");
5eb91c98
DG
1367 goto error;
1368 }
1d4b027a 1369
5eb91c98
DG
1370 /*
1371 * Using message-based transmissions to ensure we don't
1372 * have to deal with partially received messages.
1373 */
1374 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1375 sizeof(struct ust_register_msg));
1376 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1377 if (ret < 0) {
1378 perror("lttcomm_recv_unix_sock register apps");
1379 } else {
1380 ERR("Wrong size received on apps register");
1381 }
1382 free(ust_cmd);
1383 close(sock);
1384 continue;
1385 }
099e26bd 1386
5eb91c98 1387 ust_cmd->sock = sock;
099e26bd 1388
5eb91c98
DG
1389 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1390 " gid:%d sock:%d name:%s (version %d.%d)",
1391 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1392 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1393 ust_cmd->sock, ust_cmd->reg_msg.name,
1394 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1395
5eb91c98
DG
1396 /*
1397 * Lock free enqueue the registration request. The red pill
54d01ffb 1398 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1399 */
1400 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1401
1402 /*
1403 * Wake the registration queue futex. Implicit memory
1404 * barrier with the exchange in cds_wfq_enqueue.
1405 */
1406 futex_nto1_wake(&ust_cmd_queue.futex);
1407 }
1408 }
90014c57 1409 }
1d4b027a
DG
1410 }
1411
1412error:
0fdd1e2c
DG
1413 DBG("UST Registration thread dying");
1414
1415 /* Notify that the registration thread is gone */
1416 notify_ust_apps(0);
1417
1418 close(apps_sock);
1419 close(sock);
273ea72c 1420 unlink(apps_unix_sock_path);
0fdd1e2c 1421
5eb91c98
DG
1422 lttng_poll_clean(&events);
1423
1d4b027a
DG
1424 return NULL;
1425}
1426
8c0faa1d 1427/*
3bd1e081 1428 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1429 * exec or it will fails.
8c0faa1d 1430 */
3bd1e081 1431static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1432{
1433 int ret;
ee0b0061
DG
1434 struct timespec timeout;
1435
1436 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1437 timeout.tv_nsec = 0;
8c0faa1d
DG
1438
1439 /* Setup semaphore */
3bd1e081 1440 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1441 if (ret < 0) {
3bd1e081 1442 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1443 goto error;
1444 }
8c0faa1d 1445
3bd1e081
MD
1446 ret = pthread_create(&consumer_data->thread, NULL,
1447 thread_manage_consumer, consumer_data);
8c0faa1d 1448 if (ret != 0) {
3bd1e081 1449 PERROR("pthread_create consumer");
ee0b0061 1450 ret = -1;
8c0faa1d
DG
1451 goto error;
1452 }
1453
ee0b0061
DG
1454 /* Get time for sem_timedwait absolute timeout */
1455 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1456 if (ret < 0) {
3bd1e081 1457 PERROR("clock_gettime spawn consumer");
ee0b0061 1458 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1459 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1460 } else {
1461 /* Normal timeout if the gettime was successful */
1462 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1463 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1464 }
8c0faa1d 1465
ee0b0061
DG
1466 if (ret < 0) {
1467 if (errno == ETIMEDOUT) {
1468 /*
1469 * Call has timed out so we kill the kconsumerd_thread and return
1470 * an error.
1471 */
3bd1e081
MD
1472 ERR("The consumer thread was never ready. Killing it");
1473 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1474 if (ret < 0) {
3bd1e081 1475 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1476 }
1477 } else {
3bd1e081 1478 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1479 }
1480 goto error;
1481 }
1482
3bd1e081
MD
1483 pthread_mutex_lock(&consumer_data->pid_mutex);
1484 if (consumer_data->pid == 0) {
712ea556 1485 ERR("Kconsumerd did not start");
3bd1e081 1486 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1487 goto error;
1488 }
3bd1e081 1489 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1490
8c0faa1d
DG
1491 return 0;
1492
1493error:
1494 return ret;
1495}
1496
d9800920 1497/*
3bd1e081 1498 * Join consumer thread
d9800920 1499 */
3bd1e081 1500static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1501{
1502 void *status;
1503 int ret;
1504
3bd1e081
MD
1505 if (consumer_data->pid != 0) {
1506 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1507 if (ret) {
3bd1e081 1508 ERR("Error killing consumer daemon");
cf3af59e
MD
1509 return ret;
1510 }
3bd1e081 1511 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1512 } else {
1513 return 0;
1514 }
1515}
1516
8c0faa1d 1517/*
3bd1e081 1518 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1519 *
d063d709 1520 * Return pid if successful else -1.
8c0faa1d 1521 */
3bd1e081 1522static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1523{
1524 int ret;
1525 pid_t pid;
94c55f17 1526 const char *consumer_to_use;
53086306 1527 const char *verbosity;
94c55f17 1528 struct stat st;
8c0faa1d 1529
3bd1e081 1530 DBG("Spawning consumerd");
c49dc785 1531
8c0faa1d
DG
1532 pid = fork();
1533 if (pid == 0) {
1534 /*
3bd1e081 1535 * Exec consumerd.
8c0faa1d 1536 */
daee5345 1537 if (opt_verbose_consumer) {
53086306
DG
1538 verbosity = "--verbose";
1539 } else {
1540 verbosity = "--quiet";
1541 }
3bd1e081
MD
1542 switch (consumer_data->type) {
1543 case LTTNG_CONSUMER_KERNEL:
94c55f17 1544 /*
c7704d57
DG
1545 * Find out which consumerd to execute. We will first try the
1546 * 64-bit path, then the sessiond's installation directory, and
1547 * fallback on the 32-bit one,
94c55f17 1548 */
63a799e8
AM
1549 DBG3("Looking for a kernel consumer at these locations:");
1550 DBG3(" 1) %s", consumerd64_bin);
1551 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1552 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1553 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1554 DBG3("Found location #1");
94c55f17 1555 consumer_to_use = consumerd64_bin;
94c55f17 1556 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1557 DBG3("Found location #2");
94c55f17 1558 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1559 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1560 DBG3("Found location #3");
eb1e0bd4 1561 consumer_to_use = consumerd32_bin;
94c55f17 1562 } else {
63a799e8 1563 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1564 break;
1565 }
1566 DBG("Using kernel consumer at: %s", consumer_to_use);
1567 execl(consumer_to_use,
1568 "lttng-consumerd", verbosity, "-k",
1569 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1570 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1571 NULL);
3bd1e081 1572 break;
7753dea8
MD
1573 case LTTNG_CONSUMER64_UST:
1574 {
b1e0b6b6 1575 char *tmpnew = NULL;
8f4905da
MD
1576
1577 if (consumerd64_libdir[0] != '\0') {
1578 char *tmp;
1579 size_t tmplen;
1580
1581 tmp = getenv("LD_LIBRARY_PATH");
1582 if (!tmp) {
1583 tmp = "";
1584 }
1585 tmplen = strlen("LD_LIBRARY_PATH=")
1586 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1587 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1588 if (!tmpnew) {
1589 ret = -ENOMEM;
1590 goto error;
1591 }
1592 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1593 strcat(tmpnew, consumerd64_libdir);
1594 if (tmp[0] != '\0') {
1595 strcat(tmpnew, ":");
1596 strcat(tmpnew, tmp);
1597 }
1598 ret = putenv(tmpnew);
1599 if (ret) {
1600 ret = -errno;
1601 goto error;
1602 }
1603 }
94c55f17 1604 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1605 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1606 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1607 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1608 NULL);
8f4905da
MD
1609 if (consumerd64_libdir[0] != '\0') {
1610 free(tmpnew);
1611 }
1612 if (ret) {
1613 goto error;
1614 }
3bd1e081 1615 break;
7753dea8
MD
1616 }
1617 case LTTNG_CONSUMER32_UST:
1618 {
937dde8e 1619 char *tmpnew = NULL;
8f4905da
MD
1620
1621 if (consumerd32_libdir[0] != '\0') {
1622 char *tmp;
1623 size_t tmplen;
1624
1625 tmp = getenv("LD_LIBRARY_PATH");
1626 if (!tmp) {
1627 tmp = "";
1628 }
1629 tmplen = strlen("LD_LIBRARY_PATH=")
1630 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1631 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1632 if (!tmpnew) {
1633 ret = -ENOMEM;
1634 goto error;
1635 }
1636 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1637 strcat(tmpnew, consumerd32_libdir);
1638 if (tmp[0] != '\0') {
1639 strcat(tmpnew, ":");
1640 strcat(tmpnew, tmp);
1641 }
1642 ret = putenv(tmpnew);
1643 if (ret) {
1644 ret = -errno;
1645 goto error;
1646 }
1647 }
94c55f17 1648 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1649 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1650 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1651 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1652 NULL);
8f4905da
MD
1653 if (consumerd32_libdir[0] != '\0') {
1654 free(tmpnew);
1655 }
1656 if (ret) {
1657 goto error;
1658 }
7753dea8
MD
1659 break;
1660 }
3bd1e081
MD
1661 default:
1662 perror("unknown consumer type");
1663 exit(EXIT_FAILURE);
1664 }
8c0faa1d
DG
1665 if (errno != 0) {
1666 perror("kernel start consumer exec");
1667 }
1668 exit(EXIT_FAILURE);
1669 } else if (pid > 0) {
1670 ret = pid;
8c0faa1d 1671 } else {
3bd1e081 1672 perror("start consumer fork");
8c0faa1d 1673 ret = -errno;
8c0faa1d 1674 }
8f4905da 1675error:
8c0faa1d
DG
1676 return ret;
1677}
1678
693bd40b 1679/*
3bd1e081 1680 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1681 */
3bd1e081 1682static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1683{
1684 int ret;
1685
3bd1e081
MD
1686 pthread_mutex_lock(&consumer_data->pid_mutex);
1687 if (consumer_data->pid != 0) {
1688 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1689 goto end;
1690 }
693bd40b 1691
3bd1e081 1692 ret = spawn_consumerd(consumer_data);
c49dc785 1693 if (ret < 0) {
3bd1e081
MD
1694 ERR("Spawning consumerd failed");
1695 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1696 goto error;
693bd40b 1697 }
c49dc785 1698
3bd1e081
MD
1699 /* Setting up the consumer_data pid */
1700 consumer_data->pid = ret;
48842b30 1701 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1702 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1703
3bd1e081
MD
1704 DBG2("Spawning consumer control thread");
1705 ret = spawn_consumer_thread(consumer_data);
693bd40b 1706 if (ret < 0) {
3bd1e081 1707 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1708 goto error;
1709 }
1710
c49dc785 1711end:
693bd40b
DG
1712 return 0;
1713
1714error:
1715 return ret;
1716}
1717
b73401da 1718/*
096102bd 1719 * Check version of the lttng-modules.
b73401da 1720 */
096102bd 1721static int validate_lttng_modules_version(void)
b73401da 1722{
096102bd 1723 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1724}
1725
b73401da 1726/*
096102bd 1727 * Setup necessary data for kernel tracer action.
b73401da 1728 */
096102bd 1729static int init_kernel_tracer(void)
b73401da
DG
1730{
1731 int ret;
b73401da 1732
096102bd
DG
1733 /* Modprobe lttng kernel modules */
1734 ret = modprobe_lttng_control();
b73401da 1735 if (ret < 0) {
b73401da
DG
1736 goto error;
1737 }
1738
096102bd
DG
1739 /* Open debugfs lttng */
1740 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1741 if (kernel_tracer_fd < 0) {
1742 DBG("Failed to open %s", module_proc_lttng);
1743 ret = -1;
1744 goto error_open;
b73401da
DG
1745 }
1746
096102bd
DG
1747 /* Validate kernel version */
1748 ret = validate_lttng_modules_version();
b73401da 1749 if (ret < 0) {
096102bd 1750 goto error_version;
b73401da
DG
1751 }
1752
096102bd 1753 ret = modprobe_lttng_data();
b73401da 1754 if (ret < 0) {
096102bd 1755 goto error_modules;
8c0faa1d
DG
1756 }
1757
f3ed775e 1758 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1759 return 0;
1760
1761error_version:
1762 modprobe_remove_lttng_control();
1763 close(kernel_tracer_fd);
1764 kernel_tracer_fd = 0;
1765 return LTTCOMM_KERN_VERSION;
1766
1767error_modules:
1768 close(kernel_tracer_fd);
1769
1770error_open:
1771 modprobe_remove_lttng_control();
b73401da
DG
1772
1773error:
b73401da
DG
1774 WARN("No kernel tracer available");
1775 kernel_tracer_fd = 0;
096102bd 1776 return LTTCOMM_KERN_NA;
f3ed775e 1777}
33a2b854 1778
f3ed775e 1779/*
54d01ffb 1780 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1781 */
54d01ffb 1782static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1783{
f40799e8 1784 int ret = 0;
8c0faa1d 1785
3bd1e081 1786 if (session->consumer_fds_sent == 0) {
d9800920 1787 /*
54d01ffb
DG
1788 * Assign default kernel consumer socket if no consumer assigned to the
1789 * kernel session. At this point, it's NOT suppose to be 0 but this is
1790 * an extra security check.
d9800920
DG
1791 */
1792 if (session->consumer_fd == 0) {
3bd1e081 1793 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1794 }
1795
2bdd86d4 1796 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1797 if (ret < 0) {
f3ed775e
DG
1798 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1799 goto error;
1800 }
1d4b027a 1801
3bd1e081 1802 session->consumer_fds_sent = 1;
f3ed775e 1803 }
1d4b027a
DG
1804
1805error:
1806 return ret;
8c0faa1d
DG
1807}
1808
0177d773
DG
1809/*
1810 * Create an UST session and add it to the session ust list.
1811 */
44d3bd01 1812static int create_ust_session(struct ltt_session *session,
6df2e2c9 1813 struct lttng_domain *domain)
0177d773 1814{
13384287 1815 struct ltt_ust_session *lus = NULL;
6df2e2c9 1816 int ret;
44d3bd01
DG
1817
1818 switch (domain->type) {
48842b30 1819 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1820 break;
1821 default:
13384287 1822 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1823 goto error;
1824 }
0177d773
DG
1825
1826 DBG("Creating UST session");
1827
a991f516 1828 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1829 if (lus == NULL) {
44d3bd01 1830 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1831 goto error;
1832 }
1833
e11d277b 1834 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1835 session->uid, session->gid);
0177d773
DG
1836 if (ret < 0) {
1837 if (ret != -EEXIST) {
1838 ERR("Trace directory creation error");
44d3bd01 1839 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1840 goto error;
1841 }
1842 }
1843
f6a9efaa
DG
1844 /* The domain type dictate different actions on session creation */
1845 switch (domain->type) {
48842b30
DG
1846 case LTTNG_DOMAIN_UST:
1847 /* No ustctl for the global UST domain */
1848 break;
1849 default:
36dc12cc 1850 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1851 goto error;
0177d773 1852 }
6df2e2c9
MD
1853 lus->uid = session->uid;
1854 lus->gid = session->gid;
f6a9efaa 1855 session->ust_session = lus;
44d3bd01
DG
1856
1857 return LTTCOMM_OK;
0177d773
DG
1858
1859error:
1860 free(lus);
1861 return ret;
1862}
1863
333f285e 1864/*
d063d709 1865 * Create a kernel tracer session then create the default channel.
333f285e 1866 */
6df2e2c9 1867static int create_kernel_session(struct ltt_session *session)
333f285e 1868{
f3ed775e 1869 int ret;
f3ed775e
DG
1870
1871 DBG("Creating kernel session");
1872
1873 ret = kernel_create_session(session, kernel_tracer_fd);
1874 if (ret < 0) {
1875 ret = LTTCOMM_KERN_SESS_FAIL;
1876 goto error;
333f285e
DG
1877 }
1878
d9800920 1879 /* Set kernel consumer socket fd */
3bd1e081
MD
1880 if (kconsumer_data.cmd_sock) {
1881 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1882 }
1883
e11d277b 1884 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1885 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1886 if (ret < 0) {
996b65c8 1887 if (ret != -EEXIST) {
7a485870
DG
1888 ERR("Trace directory creation error");
1889 goto error;
1890 }
1891 }
6df2e2c9
MD
1892 session->kernel_session->uid = session->uid;
1893 session->kernel_session->gid = session->gid;
7a485870 1894
f3ed775e
DG
1895error:
1896 return ret;
333f285e
DG
1897}
1898
8e0af1b4 1899/*
c7704d57
DG
1900 * Check if the UID or GID match the session. Root user has access to all
1901 * sessions.
8e0af1b4 1902 */
c7704d57 1903static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1904{
c7704d57 1905 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
1906 return 0;
1907 } else {
1908 return 1;
1909 }
1910}
1911
1912static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1913{
1914 unsigned int i = 0;
1915 struct ltt_session *session;
1916
1917 DBG("Counting number of available session for UID %d GID %d",
1918 uid, gid);
1919 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1920 /*
1921 * Only list the sessions the user can control.
1922 */
1923 if (!session_access_ok(session, uid, gid)) {
1924 continue;
1925 }
1926 i++;
1927 }
1928 return i;
1929}
1930
6c9cc2ab
DG
1931/*
1932 * Using the session list, filled a lttng_session array to send back to the
1933 * client for session listing.
1934 *
1935 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1936 * session_lock_list() and session_unlock_list().
6c9cc2ab 1937 */
c7704d57
DG
1938static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1939 gid_t gid)
6c9cc2ab 1940{
8e0af1b4 1941 unsigned int i = 0;
6c9cc2ab
DG
1942 struct ltt_session *session;
1943
8e0af1b4
MD
1944 DBG("Getting all available session for UID %d GID %d",
1945 uid, gid);
6c9cc2ab
DG
1946 /*
1947 * Iterate over session list and append data after the control struct in
1948 * the buffer.
1949 */
1950 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
1951 /*
1952 * Only list the sessions the user can control.
1953 */
1954 if (!session_access_ok(session, uid, gid)) {
1955 continue;
1956 }
6c9cc2ab 1957 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1958 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1959 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1960 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1961 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1962 i++;
1963 }
1964}
1965
9f19cc17
DG
1966/*
1967 * Fill lttng_channel array of all channels.
1968 */
b551a063 1969static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1970 struct lttng_channel *channels)
1971{
1972 int i = 0;
1973 struct ltt_kernel_channel *kchan;
1974
1975 DBG("Listing channels for session %s", session->name);
1976
b551a063
DG
1977 switch (domain) {
1978 case LTTNG_DOMAIN_KERNEL:
1979 /* Kernel channels */
1980 if (session->kernel_session != NULL) {
1981 cds_list_for_each_entry(kchan,
1982 &session->kernel_session->channel_list.head, list) {
1983 /* Copy lttng_channel struct to array */
1984 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1985 channels[i].enabled = kchan->enabled;
1986 i++;
1987 }
1988 }
1989 break;
1990 case LTTNG_DOMAIN_UST:
1991 {
bec39940 1992 struct lttng_ht_iter iter;
b551a063
DG
1993 struct ltt_ust_channel *uchan;
1994
bec39940
DG
1995 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1996 &iter.iter, uchan, node.node) {
b551a063
DG
1997 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1998 channels[i].attr.overwrite = uchan->attr.overwrite;
1999 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2000 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2001 channels[i].attr.switch_timer_interval =
2002 uchan->attr.switch_timer_interval;
2003 channels[i].attr.read_timer_interval =
2004 uchan->attr.read_timer_interval;
aea829b3 2005 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2006 switch (uchan->attr.output) {
2007 case LTTNG_UST_MMAP:
2008 default:
2009 channels[i].attr.output = LTTNG_EVENT_MMAP;
2010 break;
2011 }
befe0905 2012 i++;
b551a063
DG
2013 }
2014 break;
2015 }
2016 default:
2017 break;
2018 }
2019}
2020
2021/*
2022 * Create a list of ust global domain events.
2023 */
2024static int list_lttng_ust_global_events(char *channel_name,
2025 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2026{
2027 int i = 0, ret = 0;
2028 unsigned int nb_event = 0;
bec39940
DG
2029 struct lttng_ht_iter iter;
2030 struct lttng_ht_node_str *node;
b551a063
DG
2031 struct ltt_ust_channel *uchan;
2032 struct ltt_ust_event *uevent;
2033 struct lttng_event *tmp;
2034
2035 DBG("Listing UST global events for channel %s", channel_name);
2036
2037 rcu_read_lock();
2038
bec39940
DG
2039 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2040 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2041 if (node == NULL) {
2042 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2043 goto error;
b551a063
DG
2044 }
2045
bec39940 2046 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2047
bec39940 2048 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2049
b551a063
DG
2050 if (nb_event == 0) {
2051 ret = nb_event;
2052 goto error;
2053 }
2054
2055 DBG3("Listing UST global %d events", nb_event);
2056
2057 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2058 if (tmp == NULL) {
2059 ret = -LTTCOMM_FATAL;
2060 goto error;
2061 }
2062
bec39940 2063 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2064 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2065 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2066 tmp[i].enabled = uevent->enabled;
2067 switch (uevent->attr.instrumentation) {
2068 case LTTNG_UST_TRACEPOINT:
2069 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2070 break;
2071 case LTTNG_UST_PROBE:
2072 tmp[i].type = LTTNG_EVENT_PROBE;
2073 break;
2074 case LTTNG_UST_FUNCTION:
2075 tmp[i].type = LTTNG_EVENT_FUNCTION;
2076 break;
0cda4f28 2077 }
8005f29a 2078 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2079 switch (uevent->attr.loglevel_type) {
8005f29a 2080 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2081 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2082 break;
8005f29a 2083 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2084 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2085 break;
2086 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2087 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2088 break;
9f19cc17 2089 }
d7b75b30 2090 i++;
9f19cc17
DG
2091 }
2092
b551a063
DG
2093 ret = nb_event;
2094 *events = tmp;
2095
2096error:
2097 rcu_read_unlock();
2098 return ret;
9f19cc17
DG
2099}
2100
2101/*
b551a063 2102 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2103 */
b551a063
DG
2104static int list_lttng_kernel_events(char *channel_name,
2105 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2106{
b551a063
DG
2107 int i = 0, ret;
2108 unsigned int nb_event;
9f19cc17 2109 struct ltt_kernel_event *event;
b551a063
DG
2110 struct ltt_kernel_channel *kchan;
2111
2112 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2113 if (kchan == NULL) {
2114 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2115 goto error;
2116 }
2117
2118 nb_event = kchan->event_count;
9f19cc17
DG
2119
2120 DBG("Listing events for channel %s", kchan->channel->name);
2121
b551a063
DG
2122 if (nb_event == 0) {
2123 ret = nb_event;
2124 goto error;
2125 }
2126
2127 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2128 if (*events == NULL) {
2129 ret = LTTCOMM_FATAL;
2130 goto error;
2131 }
2132
9f19cc17
DG
2133 /* Kernel channels */
2134 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2135 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2136 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2137 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2138 switch (event->event->instrumentation) {
2139 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2140 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2141 break;
2142 case LTTNG_KERNEL_KPROBE:
2143 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2144 (*events)[i].type = LTTNG_EVENT_PROBE;
2145 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2146 sizeof(struct lttng_kernel_kprobe));
2147 break;
2148 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2149 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2150 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2151 sizeof(struct lttng_kernel_function));
2152 break;
0133c199 2153 case LTTNG_KERNEL_NOOP:
b551a063 2154 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2155 break;
a54bd42d 2156 case LTTNG_KERNEL_SYSCALL:
b551a063 2157 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2158 break;
7a3d1328
MD
2159 case LTTNG_KERNEL_ALL:
2160 assert(0);
2161 break;
9f19cc17
DG
2162 }
2163 i++;
2164 }
b551a063
DG
2165
2166 return nb_event;
2167
2168error:
2169 return ret;
9f19cc17
DG
2170}
2171
fac6795d 2172/*
54d01ffb 2173 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2174 */
54d01ffb
DG
2175static int cmd_disable_channel(struct ltt_session *session,
2176 int domain, char *channel_name)
fac6795d 2177{
54d01ffb 2178 int ret;
78f0bacd
DG
2179 struct ltt_ust_session *usess;
2180
2181 usess = session->ust_session;
379473d2 2182
54d01ffb 2183 switch (domain) {
78f0bacd
DG
2184 case LTTNG_DOMAIN_KERNEL:
2185 {
2186 ret = channel_kernel_disable(session->kernel_session,
2187 channel_name);
2188 if (ret != LTTCOMM_OK) {
2189 goto error;
2190 }
54d01ffb 2191
78f0bacd
DG
2192 kernel_wait_quiescent(kernel_tracer_fd);
2193 break;
2194 }
2195 case LTTNG_DOMAIN_UST:
2196 {
2197 struct ltt_ust_channel *uchan;
bec39940 2198 struct lttng_ht *chan_ht;
78f0bacd 2199
7885e399
DG
2200 chan_ht = usess->domain_global.channels;
2201
2202 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2203 if (uchan == NULL) {
2204 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2205 goto error;
78f0bacd
DG
2206 }
2207
7885e399
DG
2208 ret = channel_ust_disable(usess, domain, uchan);
2209 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2210 goto error;
2211 }
78f0bacd
DG
2212 break;
2213 }
d78d6610 2214#if 0
78f0bacd
DG
2215 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2216 case LTTNG_DOMAIN_UST_EXEC_NAME:
2217 case LTTNG_DOMAIN_UST_PID:
d78d6610 2218#endif
78f0bacd
DG
2219 default:
2220 ret = LTTCOMM_UNKNOWN_DOMAIN;
2221 goto error;
20fe2104
DG
2222 }
2223
54d01ffb 2224 ret = LTTCOMM_OK;
d65106b1 2225
54d01ffb
DG
2226error:
2227 return ret;
2228}
2229
2230/*
2231 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2232 */
44d3bd01 2233static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2234 int domain, struct lttng_channel *attr)
54d01ffb
DG
2235{
2236 int ret;
f6a9efaa 2237 struct ltt_ust_session *usess = session->ust_session;
bec39940 2238 struct lttng_ht *chan_ht;
f6a9efaa 2239
5d56b5aa 2240 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2241
aea829b3 2242 switch (domain) {
44d3bd01
DG
2243 case LTTNG_DOMAIN_KERNEL:
2244 {
2245 struct ltt_kernel_channel *kchan;
54d01ffb 2246
44d3bd01
DG
2247 kchan = trace_kernel_get_channel_by_name(attr->name,
2248 session->kernel_session);
2249 if (kchan == NULL) {
2250 ret = channel_kernel_create(session->kernel_session,
2251 attr, kernel_poll_pipe[1]);
2252 } else {
2253 ret = channel_kernel_enable(session->kernel_session, kchan);
2254 }
2255
2256 if (ret != LTTCOMM_OK) {
2257 goto error;
2258 }
2259
2260 kernel_wait_quiescent(kernel_tracer_fd);
2261 break;
2262 }
f6a9efaa
DG
2263 case LTTNG_DOMAIN_UST:
2264 {
2265 struct ltt_ust_channel *uchan;
2266
7885e399 2267 chan_ht = usess->domain_global.channels;
f6a9efaa 2268
7885e399 2269 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2270 if (uchan == NULL) {
7885e399 2271 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2272 } else {
7885e399 2273 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2274 }
f6a9efaa
DG
2275 break;
2276 }
d78d6610 2277#if 0
78f0bacd
DG
2278 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2279 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2280 case LTTNG_DOMAIN_UST_PID:
d78d6610 2281#endif
44d3bd01
DG
2282 default:
2283 ret = LTTCOMM_UNKNOWN_DOMAIN;
2284 goto error;
54d01ffb
DG
2285 }
2286
54d01ffb
DG
2287error:
2288 return ret;
2289}
2290
2291/*
2292 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2293 */
2294static int cmd_disable_event(struct ltt_session *session, int domain,
2295 char *channel_name, char *event_name)
2296{
2297 int ret;
54d01ffb
DG
2298
2299 switch (domain) {
2300 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2301 {
2302 struct ltt_kernel_channel *kchan;
b0a40d28 2303 struct ltt_kernel_session *ksess;
2bdd86d4 2304
b0a40d28
DG
2305 ksess = session->kernel_session;
2306
2307 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2308 if (kchan == NULL) {
2309 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2310 goto error;
d65106b1
DG
2311 }
2312
b0a40d28 2313 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2314 if (ret != LTTCOMM_OK) {
2315 goto error;
2316 }
2317
2318 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2319 break;
2bdd86d4
MD
2320 }
2321 case LTTNG_DOMAIN_UST:
b0a40d28 2322 {
b0a40d28 2323 struct ltt_ust_channel *uchan;
7f79d3a1 2324 struct ltt_ust_session *usess;
b0a40d28
DG
2325
2326 usess = session->ust_session;
2327
2328 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2329 channel_name);
2330 if (uchan == NULL) {
2331 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2332 goto error;
2333 }
2334
7f79d3a1
DG
2335 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2336 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2337 goto error;
2338 }
2339
7f79d3a1 2340 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2341 channel_name);
b0a40d28
DG
2342 break;
2343 }
d78d6610 2344#if 0
2bdd86d4
MD
2345 case LTTNG_DOMAIN_UST_EXEC_NAME:
2346 case LTTNG_DOMAIN_UST_PID:
2347 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2348#endif
54d01ffb 2349 default:
1ab1ea0b 2350 ret = LTTCOMM_UND;
54d01ffb 2351 goto error;
d65106b1 2352 }
26cc6b4e 2353
54d01ffb
DG
2354 ret = LTTCOMM_OK;
2355
2356error:
2357 return ret;
2358}
2359
2360/*
2361 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2362 */
2363static int cmd_disable_event_all(struct ltt_session *session, int domain,
2364 char *channel_name)
2365{
2366 int ret;
54d01ffb
DG
2367
2368 switch (domain) {
2369 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2370 {
2371 struct ltt_kernel_session *ksess;
2372 struct ltt_kernel_channel *kchan;
2373
2374 ksess = session->kernel_session;
2375
2376 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2377 if (kchan == NULL) {
2378 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2379 goto error;
26cc6b4e
DG
2380 }
2381
9730260e 2382 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2383 if (ret != LTTCOMM_OK) {
0b97ec54 2384 goto error;
26cc6b4e
DG
2385 }
2386
54d01ffb 2387 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2388 break;
9730260e
DG
2389 }
2390 case LTTNG_DOMAIN_UST:
2391 {
2392 struct ltt_ust_session *usess;
2393 struct ltt_ust_channel *uchan;
2394
2395 usess = session->ust_session;
2396
2397 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2398 channel_name);
2399 if (uchan == NULL) {
2400 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2401 goto error;
2402 }
2403
7f79d3a1
DG
2404 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2405 if (ret != 0) {
9730260e
DG
2406 goto error;
2407 }
2408
7f79d3a1 2409 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2410
2411 break;
2412 }
d78d6610 2413#if 0
9730260e
DG
2414 case LTTNG_DOMAIN_UST_EXEC_NAME:
2415 case LTTNG_DOMAIN_UST_PID:
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2417#endif
54d01ffb 2418 default:
1ab1ea0b 2419 ret = LTTCOMM_UND;
54d01ffb 2420 goto error;
26cc6b4e 2421 }
e953ef25 2422
54d01ffb 2423 ret = LTTCOMM_OK;
e953ef25 2424
54d01ffb
DG
2425error:
2426 return ret;
2427}
f5177a38 2428
54d01ffb
DG
2429/*
2430 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2431 */
2432static int cmd_add_context(struct ltt_session *session, int domain,
2433 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2434{
2435 int ret;
f5177a38 2436
54d01ffb
DG
2437 switch (domain) {
2438 case LTTNG_DOMAIN_KERNEL:
2439 /* Add kernel context to kernel tracer */
2440 ret = context_kernel_add(session->kernel_session, ctx,
2441 event_name, channel_name);
2442 if (ret != LTTCOMM_OK) {
f5177a38 2443 goto error;
e953ef25 2444 }
2bdd86d4
MD
2445 break;
2446 case LTTNG_DOMAIN_UST:
2447 {
55cc08a6 2448 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2449
55cc08a6
DG
2450 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2451 if (ret != LTTCOMM_OK) {
2452 goto error;
2bdd86d4 2453 }
e953ef25 2454 break;
2bdd86d4 2455 }
d78d6610 2456#if 0
55cc08a6
DG
2457 case LTTNG_DOMAIN_UST_EXEC_NAME:
2458 case LTTNG_DOMAIN_UST_PID:
2459 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2460#endif
54d01ffb 2461 default:
1ab1ea0b 2462 ret = LTTCOMM_UND;
54d01ffb 2463 goto error;
e953ef25 2464 }
950131af 2465
54d01ffb 2466 ret = LTTCOMM_OK;
950131af 2467
54d01ffb
DG
2468error:
2469 return ret;
2470}
2471
2472/*
2473 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2474 */
2475static int cmd_enable_event(struct ltt_session *session, int domain,
2476 char *channel_name, struct lttng_event *event)
2477{
2478 int ret;
f6cd6b0f 2479 struct lttng_channel *attr;
48842b30 2480 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2481
2482 switch (domain) {
2483 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2484 {
2485 struct ltt_kernel_channel *kchan;
2486
54d01ffb
DG
2487 kchan = trace_kernel_get_channel_by_name(channel_name,
2488 session->kernel_session);
2489 if (kchan == NULL) {
f6cd6b0f
DG
2490 attr = channel_new_default_attr(domain);
2491 if (attr == NULL) {
2492 ret = LTTCOMM_FATAL;
2493 goto error;
2494 }
2495 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2496
54d01ffb 2497 /* This call will notify the kernel thread */
44d3bd01 2498 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2499 attr, kernel_poll_pipe[1]);
54d01ffb 2500 if (ret != LTTCOMM_OK) {
ff4d74e6 2501 free(attr);
f5177a38
DG
2502 goto error;
2503 }
ff4d74e6 2504 free(attr);
54d01ffb 2505 }
950131af 2506
54d01ffb
DG
2507 /* Get the newly created kernel channel pointer */
2508 kchan = trace_kernel_get_channel_by_name(channel_name,
2509 session->kernel_session);
2510 if (kchan == NULL) {
2511 /* This sould not happen... */
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
f5177a38 2515
48842b30
DG
2516 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2517 event);
54d01ffb 2518 if (ret != LTTCOMM_OK) {
f5177a38 2519 goto error;
950131af
DG
2520 }
2521
54d01ffb 2522 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2523 break;
2bdd86d4
MD
2524 }
2525 case LTTNG_DOMAIN_UST:
2526 {
aea829b3 2527 struct lttng_channel *attr;
edb67388 2528 struct ltt_ust_channel *uchan;
2bdd86d4 2529
edb67388 2530 /* Get channel from global UST domain */
48842b30
DG
2531 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2532 channel_name);
2533 if (uchan == NULL) {
aea829b3
DG
2534 /* Create default channel */
2535 attr = channel_new_default_attr(domain);
2536 if (attr == NULL) {
2537 ret = LTTCOMM_FATAL;
2538 goto error;
2539 }
596219f7 2540 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2541 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2542
7885e399 2543 ret = channel_ust_create(usess, domain, attr);
edb67388 2544 if (ret != LTTCOMM_OK) {
ff4d74e6 2545 free(attr);
aea829b3
DG
2546 goto error;
2547 }
aea829b3
DG
2548 free(attr);
2549
2550 /* Get the newly created channel reference back */
2551 uchan = trace_ust_find_channel_by_name(
2552 usess->domain_global.channels, channel_name);
2553 if (uchan == NULL) {
2554 /* Something is really wrong */
2555 ret = LTTCOMM_FATAL;
2556 goto error;
2557 }
48842b30 2558 }
2bdd86d4 2559
edb67388 2560 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2561 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2562 if (ret != LTTCOMM_OK) {
48842b30 2563 goto error;
2bdd86d4
MD
2564 }
2565 break;
2566 }
d78d6610 2567#if 0
2bdd86d4
MD
2568 case LTTNG_DOMAIN_UST_EXEC_NAME:
2569 case LTTNG_DOMAIN_UST_PID:
2570 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2571#endif
54d01ffb 2572 default:
1ab1ea0b 2573 ret = LTTCOMM_UND;
54d01ffb 2574 goto error;
950131af 2575 }
d36b8583 2576
54d01ffb 2577 ret = LTTCOMM_OK;
d36b8583 2578
54d01ffb
DG
2579error:
2580 return ret;
2581}
7d29a247 2582
54d01ffb
DG
2583/*
2584 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2585 */
2586static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2587 char *channel_name, int event_type)
54d01ffb
DG
2588{
2589 int ret;
2590 struct ltt_kernel_channel *kchan;
7d29a247 2591
54d01ffb
DG
2592 switch (domain) {
2593 case LTTNG_DOMAIN_KERNEL:
2594 kchan = trace_kernel_get_channel_by_name(channel_name,
2595 session->kernel_session);
2596 if (kchan == NULL) {
2597 /* This call will notify the kernel thread */
44d3bd01
DG
2598 ret = channel_kernel_create(session->kernel_session, NULL,
2599 kernel_poll_pipe[1]);
54d01ffb
DG
2600 if (ret != LTTCOMM_OK) {
2601 goto error;
d36b8583 2602 }
0d0c377a 2603
8f69e5eb
DG
2604 /* Get the newly created kernel channel pointer */
2605 kchan = trace_kernel_get_channel_by_name(channel_name,
2606 session->kernel_session);
2607 if (kchan == NULL) {
2608 /* This sould not happen... */
2609 ret = LTTCOMM_FATAL;
2610 goto error;
2611 }
2612
54d01ffb 2613 }
0fdd1e2c 2614
7a3d1328 2615 switch (event_type) {
76d45b40 2616 case LTTNG_EVENT_SYSCALL:
7a3d1328 2617 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2618 kchan, kernel_tracer_fd);
7a3d1328 2619 break;
76d45b40 2620 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2621 /*
7a3d1328
MD
2622 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2623 * events already registered to the channel.
8c9ae521 2624 */
7a3d1328
MD
2625 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2626 kchan, kernel_tracer_fd);
2627 break;
76d45b40 2628 case LTTNG_EVENT_ALL:
7a3d1328 2629 /* Enable syscalls and tracepoints */
8c9ae521
DG
2630 ret = event_kernel_enable_all(session->kernel_session,
2631 kchan, kernel_tracer_fd);
7a3d1328
MD
2632 break;
2633 default:
2634 ret = LTTCOMM_KERN_ENABLE_FAIL;
2635 goto error;
8c9ae521 2636 }
8f69e5eb
DG
2637
2638 /* Manage return value */
54d01ffb 2639 if (ret != LTTCOMM_OK) {
0d0c377a 2640 goto error;
d36b8583
DG
2641 }
2642
54d01ffb 2643 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2644 break;
76d45b40
DG
2645 case LTTNG_DOMAIN_UST:
2646 {
2647 struct lttng_channel *attr;
2648 struct ltt_ust_channel *uchan;
2649 struct ltt_ust_session *usess = session->ust_session;
2650
2651 /* Get channel from global UST domain */
2652 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2653 channel_name);
2654 if (uchan == NULL) {
2655 /* Create default channel */
2656 attr = channel_new_default_attr(domain);
2657 if (attr == NULL) {
2658 ret = LTTCOMM_FATAL;
2659 goto error;
2660 }
2661 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2662 attr->name[NAME_MAX - 1] = '\0';
2663
2664 /* Use the internal command enable channel */
7885e399 2665 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2666 if (ret != LTTCOMM_OK) {
2667 free(attr);
2668 goto error;
2669 }
2670 free(attr);
2671
2672 /* Get the newly created channel reference back */
2673 uchan = trace_ust_find_channel_by_name(
2674 usess->domain_global.channels, channel_name);
2675 if (uchan == NULL) {
2676 /* Something is really wrong */
2677 ret = LTTCOMM_FATAL;
2678 goto error;
2679 }
2680 }
2681
2682 /* At this point, the session and channel exist on the tracer */
2683
2684 switch (event_type) {
2685 case LTTNG_EVENT_ALL:
2686 case LTTNG_EVENT_TRACEPOINT:
2687 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2688 if (ret != LTTCOMM_OK) {
2689 goto error;
2690 }
2691 break;
2692 default:
2693 ret = LTTCOMM_UST_ENABLE_FAIL;
2694 goto error;
2695 }
2696
2697 /* Manage return value */
2698 if (ret != LTTCOMM_OK) {
2699 goto error;
2700 }
2701
2702 break;
2703 }
d78d6610 2704#if 0
76d45b40
DG
2705 case LTTNG_DOMAIN_UST_EXEC_NAME:
2706 case LTTNG_DOMAIN_UST_PID:
2707 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2708#endif
54d01ffb 2709 default:
1ab1ea0b 2710 ret = LTTCOMM_UND;
54d01ffb 2711 goto error;
d36b8583 2712 }
f3ed775e 2713
54d01ffb
DG
2714 ret = LTTCOMM_OK;
2715
2716error:
2717 return ret;
2718}
2719
2720/*
2721 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2722 */
2723static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2724{
2725 int ret;
2726 ssize_t nb_events = 0;
2727
2728 switch (domain) {
2729 case LTTNG_DOMAIN_KERNEL:
2730 nb_events = kernel_list_events(kernel_tracer_fd, events);
2731 if (nb_events < 0) {
2732 ret = LTTCOMM_KERN_LIST_FAIL;
2733 goto error;
894be886 2734 }
54d01ffb 2735 break;
b551a063
DG
2736 case LTTNG_DOMAIN_UST:
2737 nb_events = ust_app_list_events(events);
2738 if (nb_events < 0) {
2739 ret = LTTCOMM_UST_LIST_FAIL;
2740 goto error;
2741 }
2742 break;
54d01ffb 2743 default:
1ab1ea0b 2744 ret = LTTCOMM_UND;
54d01ffb
DG
2745 goto error;
2746 }
894be886 2747
54d01ffb 2748 return nb_events;
7d29a247 2749
54d01ffb
DG
2750error:
2751 /* Return negative value to differentiate return code */
2752 return -ret;
2753}
b389abbe 2754
54d01ffb
DG
2755/*
2756 * Command LTTNG_START_TRACE processed by the client thread.
2757 */
2758static int cmd_start_trace(struct ltt_session *session)
2759{
2760 int ret;
54d01ffb 2761 struct ltt_kernel_session *ksession;
b9d9b220 2762 struct ltt_ust_session *usess;
b389abbe 2763
54d01ffb
DG
2764 /* Short cut */
2765 ksession = session->kernel_session;
b9d9b220 2766 usess = session->ust_session;
5eb91c98 2767
b9ef1c83
DG
2768 if (session->enabled) {
2769 ret = LTTCOMM_UST_START_FAIL;
2770 goto error;
2771 }
2772
464dd62d
MD
2773 session->enabled = 1;
2774
54d01ffb
DG
2775 /* Kernel tracing */
2776 if (ksession != NULL) {
2bdd86d4
MD
2777 struct ltt_kernel_channel *kchan;
2778
54d01ffb
DG
2779 /* Open kernel metadata */
2780 if (ksession->metadata == NULL) {
2781 ret = kernel_open_metadata(ksession, ksession->trace_path);
2782 if (ret < 0) {
2783 ret = LTTCOMM_KERN_META_FAIL;
2784 goto error;
b389abbe 2785 }
54d01ffb 2786 }
7d29a247 2787
54d01ffb
DG
2788 /* Open kernel metadata stream */
2789 if (ksession->metadata_stream_fd == 0) {
2790 ret = kernel_open_metadata_stream(ksession);
2791 if (ret < 0) {
2792 ERR("Kernel create metadata stream failed");
2793 ret = LTTCOMM_KERN_STREAM_FAIL;
2794 goto error;
2795 }
2796 }
2797
2798 /* For each channel */
2799 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2800 if (kchan->stream_count == 0) {
2801 ret = kernel_open_channel_stream(kchan);
2802 if (ret < 0) {
2803 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2804 goto error;
2805 }
54d01ffb
DG
2806 /* Update the stream global counter */
2807 ksession->stream_count_global += ret;
7d29a247 2808 }
54d01ffb
DG
2809 }
2810
2811 /* Setup kernel consumer socket and send fds to it */
2812 ret = init_kernel_tracing(ksession);
2813 if (ret < 0) {
2814 ret = LTTCOMM_KERN_START_FAIL;
2815 goto error;
2816 }
2817
2818 /* This start the kernel tracing */
2819 ret = kernel_start_session(ksession);
2820 if (ret < 0) {
2821 ret = LTTCOMM_KERN_START_FAIL;
2822 goto error;
2823 }
2824
2825 /* Quiescent wait after starting trace */
2826 kernel_wait_quiescent(kernel_tracer_fd);
2827 }
2828
36dc12cc 2829 /* Flag session that trace should start automatically */
b9d9b220
DG
2830 if (usess) {
2831 usess->start_trace = 1;
36dc12cc 2832
b9d9b220
DG
2833 ret = ust_app_start_trace_all(usess);
2834 if (ret < 0) {
2835 ret = LTTCOMM_UST_START_FAIL;
2836 goto error;
2837 }
2bdd86d4 2838 }
54d01ffb
DG
2839
2840 ret = LTTCOMM_OK;
2841
2842error:
2843 return ret;
2844}
2845
2846/*
2847 * Command LTTNG_STOP_TRACE processed by the client thread.
2848 */
2849static int cmd_stop_trace(struct ltt_session *session)
2850{
2851 int ret;
2852 struct ltt_kernel_channel *kchan;
2853 struct ltt_kernel_session *ksession;
8be98f9a 2854 struct ltt_ust_session *usess;
54d01ffb
DG
2855
2856 /* Short cut */
2857 ksession = session->kernel_session;
8be98f9a 2858 usess = session->ust_session;
54d01ffb 2859
b9ef1c83 2860 if (!session->enabled) {
190df5ac 2861 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG
2862 goto error;
2863 }
2864
464dd62d
MD
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) {
190df5ac 2898 ret = LTTCOMM_UST_STOP_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 */
ca4537d3 2912static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG
2913{
2914 int ret;
2915
ca4537d3 2916 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG
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 }
4466912f
DG
2973 case LTTNG_DOMAIN_UST:
2974 {
2975 struct lttng_ust_calibrate ucalibrate;
2976
2977 ucalibrate.type = calibrate->type;
2978 ret = ust_app_calibrate_glb(&ucalibrate);
2979 if (ret < 0) {
2980 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2981 goto error;
2982 }
2983 break;
2984 }
54d01ffb 2985 default:
1ab1ea0b 2986 ret = LTTCOMM_UND;
54d01ffb
DG
2987 goto error;
2988 }
33a2b854 2989
54d01ffb 2990 ret = LTTCOMM_OK;
33a2b854 2991
54d01ffb
DG
2992error:
2993 return ret;
2994}
7d29a247 2995
54d01ffb
DG
2996/*
2997 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2998 */
2999static int cmd_register_consumer(struct ltt_session *session, int domain,
3000 char *sock_path)
3001{
3002 int ret, sock;
b389abbe 3003
54d01ffb
DG
3004 switch (domain) {
3005 case LTTNG_DOMAIN_KERNEL:
3006 /* Can't register a consumer if there is already one */
48c4f28c 3007 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3008 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3009 goto error;
3010 }
3011
3012 sock = lttcomm_connect_unix_sock(sock_path);
3013 if (sock < 0) {
3014 ret = LTTCOMM_CONNECT_FAIL;
3015 goto error;
3016 }
3017
3018 session->kernel_session->consumer_fd = sock;
3019 break;
3020 default:
3021 /* TODO: Userspace tracing */
1ab1ea0b 3022 ret = LTTCOMM_UND;
54d01ffb
DG
3023 goto error;
3024 }
3025
3026 ret = LTTCOMM_OK;
3027
3028error:
3029 return ret;
3030}
3031
3032/*
3033 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3034 */
3035static ssize_t cmd_list_domains(struct ltt_session *session,
3036 struct lttng_domain **domains)
3037{
b551a063 3038 int ret, index = 0;
54d01ffb
DG
3039 ssize_t nb_dom = 0;
3040
3041 if (session->kernel_session != NULL) {
b551a063 3042 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3043 nb_dom++;
3044 }
3045
b551a063
DG
3046 if (session->ust_session != NULL) {
3047 DBG3("Listing domains found UST global domain");
3048 nb_dom++;
3049 }
54d01ffb 3050
b551a063 3051 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3052 if (*domains == NULL) {
3053 ret = -LTTCOMM_FATAL;
3054 goto error;
3055 }
3056
b551a063
DG
3057 if (session->kernel_session != NULL) {
3058 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3059 index++;
3060 }
3061
3062 if (session->ust_session != NULL) {
3063 (*domains)[index].type = LTTNG_DOMAIN_UST;
3064 index++;
3065 }
54d01ffb 3066
54d01ffb
DG
3067 return nb_dom;
3068
3069error:
3070 return ret;
3071}
3072
3073/*
3074 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3075 */
b551a063 3076static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3077 struct lttng_channel **channels)
3078{
3079 int ret;
3080 ssize_t nb_chan = 0;
3081
b551a063
DG
3082 switch (domain) {
3083 case LTTNG_DOMAIN_KERNEL:
3084 if (session->kernel_session != NULL) {
3085 nb_chan = session->kernel_session->channel_count;
3086 }
0df502fd 3087 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3088 break;
3089 case LTTNG_DOMAIN_UST:
3090 if (session->ust_session != NULL) {
bec39940 3091 nb_chan = lttng_ht_get_count(
b551a063
DG
3092 session->ust_session->domain_global.channels);
3093 }
0df502fd 3094 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3095 break;
3096 default:
3097 *channels = NULL;
1ab1ea0b 3098 ret = -LTTCOMM_UND;
54d01ffb
DG
3099 goto error;
3100 }
3101
b551a063
DG
3102 if (nb_chan > 0) {
3103 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3104 if (*channels == NULL) {
3105 ret = -LTTCOMM_FATAL;
3106 goto error;
3107 }
54d01ffb 3108
b551a063
DG
3109 list_lttng_channels(domain, session, *channels);
3110 } else {
3111 *channels = NULL;
3112 }
2bdd86d4 3113
54d01ffb
DG
3114 return nb_chan;
3115
3116error:
3117 return ret;
3118}
3119
3120/*
3121 * Command LTTNG_LIST_EVENTS processed by the client thread.
3122 */
b551a063 3123static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3124 char *channel_name, struct lttng_event **events)
3125{
b551a063 3126 int ret = 0;
54d01ffb 3127 ssize_t nb_event = 0;
54d01ffb 3128
b551a063
DG
3129 switch (domain) {
3130 case LTTNG_DOMAIN_KERNEL:
3131 if (session->kernel_session != NULL) {
3132 nb_event = list_lttng_kernel_events(channel_name,
3133 session->kernel_session, events);
54d01ffb 3134 }
b551a063
DG
3135 break;
3136 case LTTNG_DOMAIN_UST:
3137 {
3138 if (session->ust_session != NULL) {
3139 nb_event = list_lttng_ust_global_events(channel_name,
3140 &session->ust_session->domain_global, events);
3141 }
3142 break;
54d01ffb 3143 }
b551a063 3144 default:
1ab1ea0b 3145 ret = -LTTCOMM_UND;
54d01ffb
DG
3146 goto error;
3147 }
3148
b551a063 3149 ret = nb_event;
54d01ffb
DG
3150
3151error:
3152 return ret;
3153}
3154
3155/*
3156 * Process the command requested by the lttng client within the command
3157 * context structure. This function make sure that the return structure (llm)
3158 * is set and ready for transmission before returning.
3159 *
3160 * Return any error encountered or 0 for success.
3161 */
3162static int process_client_msg(struct command_ctx *cmd_ctx)
3163{
3164 int ret = LTTCOMM_OK;
44d3bd01 3165 int need_tracing_session = 1;
f84aa40a 3166 int need_domain;
54d01ffb
DG
3167
3168 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3169
f84aa40a
MD
3170 switch (cmd_ctx->lsm->cmd_type) {
3171 case LTTNG_CREATE_SESSION:
3172 case LTTNG_DESTROY_SESSION:
3173 case LTTNG_LIST_SESSIONS:
3174 case LTTNG_LIST_DOMAINS:
3175 case LTTNG_START_TRACE:
3176 case LTTNG_STOP_TRACE:
3177 need_domain = 0;
faf09bcf 3178 break;
f84aa40a
MD
3179 default:
3180 need_domain = 1;
3181 }
3182
3183 if (opt_no_kernel && need_domain
3184 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
4fba7219
DG
3185 ret = LTTCOMM_KERN_NA;
3186 goto error;
3187 }
3188
54d01ffb
DG
3189 /*
3190 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3191 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3192 * command.
3193 */
3194 switch(cmd_ctx->lsm->cmd_type) {
3195 case LTTNG_LIST_SESSIONS:
3196 case LTTNG_LIST_TRACEPOINTS:
3197 case LTTNG_LIST_DOMAINS:
3198 case LTTNG_LIST_CHANNELS:
3199 case LTTNG_LIST_EVENTS:
3200 break;
3201 default:
3202 /* Setup lttng message with no payload */
3203 ret = setup_lttng_msg(cmd_ctx, 0);
3204 if (ret < 0) {
3205 /* This label does not try to unlock the session */
3206 goto init_setup_error;
3207 }
3208 }
3209
3210 /* Commands that DO NOT need a session. */
3211 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 3212 case LTTNG_CREATE_SESSION:
f84aa40a 3213 case LTTNG_CALIBRATE:
54d01ffb
DG
3214 case LTTNG_LIST_SESSIONS:
3215 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3216 need_tracing_session = 0;
54d01ffb
DG
3217 break;
3218 default:
3219 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3220 session_lock_list();
54d01ffb 3221 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3222 session_unlock_list();
54d01ffb
DG
3223 if (cmd_ctx->session == NULL) {
3224 if (cmd_ctx->lsm->session.name != NULL) {
3225 ret = LTTCOMM_SESS_NOT_FOUND;
3226 } else {
3227 /* If no session name specified */
3228 ret = LTTCOMM_SELECT_SESS;
3229 }
3230 goto error;
3231 } else {
3232 /* Acquire lock for the session */
3233 session_lock(cmd_ctx->session);
3234 }
3235 break;
3236 }
b389abbe 3237
f84aa40a
MD
3238 if (!need_domain) {
3239 goto skip_domain;
3240 }
54d01ffb
DG
3241 /*
3242 * Check domain type for specific "pre-action".
3243 */
3244 switch (cmd_ctx->lsm->domain.type) {
3245 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG
3246 if (!is_root) {
3247 ret = LTTCOMM_KERN_NA;
3248 goto error;
3249 }
3250
54d01ffb
DG
3251 /* Kernel tracer check */
3252 if (kernel_tracer_fd == 0) {
3253 /* Basically, load kernel tracer modules */
096102bd
DG
3254 ret = init_kernel_tracer();
3255 if (ret != 0) {
54d01ffb
DG
3256 goto error;
3257 }
3258 }
5eb91c98 3259
54d01ffb 3260 /* Need a session for kernel command */
44d3bd01 3261 if (need_tracing_session) {
54d01ffb 3262 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3263 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3264 if (ret < 0) {
54d01ffb 3265 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3266 goto error;
3267 }
b389abbe 3268 }
7d29a247 3269
54d01ffb 3270 /* Start the kernel consumer daemon */
3bd1e081
MD
3271 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3272 if (kconsumer_data.pid == 0 &&
54d01ffb 3273 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3274 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3275 ret = start_consumerd(&kconsumer_data);
7d29a247 3276 if (ret < 0) {
54d01ffb
DG
3277 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3278 goto error;
950131af 3279 }
3ff2ecac
MD
3280 } else {
3281 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3282 }
0d0c377a 3283 }
54d01ffb 3284 break;
2bdd86d4 3285 case LTTNG_DOMAIN_UST:
44d3bd01 3286 {
44d3bd01 3287 if (need_tracing_session) {
f6a9efaa 3288 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3289 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3290 &cmd_ctx->lsm->domain);
44d3bd01
DG
3291 if (ret != LTTCOMM_OK) {
3292 goto error;
3293 }
3294 }
7753dea8
MD
3295 /* Start the UST consumer daemons */
3296 /* 64-bit */
3297 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3298 if (consumerd64_bin[0] != '\0' &&
7753dea8 3299 ustconsumer64_data.pid == 0 &&
2bdd86d4 3300 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3301 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3302 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3303 if (ret < 0) {
7753dea8
MD
3304 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3305 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3306 goto error;
3307 }
48842b30 3308
7753dea8 3309 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3310 } else {
7753dea8
MD
3311 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3312 }
3313 /* 32-bit */
fc7a59ce 3314 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD
3315 ustconsumer32_data.pid == 0 &&
3316 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3317 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3318 ret = start_consumerd(&ustconsumer32_data);
3319 if (ret < 0) {
3320 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3321 ust_consumerd32_fd = -EINVAL;
3322 goto error;
3323 }
3324 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3325 } else {
3326 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3327 }
44d3bd01
DG
3328 }
3329 break;
48842b30 3330 }
54d01ffb 3331 default:
54d01ffb
DG
3332 break;
3333 }
f84aa40a 3334skip_domain:
33a2b854 3335
8e0af1b4
MD
3336 /*
3337 * Check that the UID or GID match that of the tracing session.
3338 * The root user can interact with all sessions.
3339 */
3340 if (need_tracing_session) {
3341 if (!session_access_ok(cmd_ctx->session,
ca4537d3 3342 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
8e0af1b4
MD
3343 ret = LTTCOMM_EPERM;
3344 goto error;
3345 }
3346 }
3347
54d01ffb
DG
3348 /* Process by command type */
3349 switch (cmd_ctx->lsm->cmd_type) {
3350 case LTTNG_ADD_CONTEXT:
3351 {
3352 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3353 cmd_ctx->lsm->u.context.channel_name,
3354 cmd_ctx->lsm->u.context.event_name,
3355 &cmd_ctx->lsm->u.context.ctx);
3356 break;
3357 }
3358 case LTTNG_DISABLE_CHANNEL:
3359 {
3360 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3361 cmd_ctx->lsm->u.disable.channel_name);
3362 break;
3363 }
3364 case LTTNG_DISABLE_EVENT:
3365 {
3366 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3367 cmd_ctx->lsm->u.disable.channel_name,
3368 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3369 break;
3370 }
54d01ffb
DG
3371 case LTTNG_DISABLE_ALL_EVENT:
3372 {
2bdd86d4 3373 DBG("Disabling all events");
54d01ffb
DG
3374
3375 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3376 cmd_ctx->lsm->u.disable.channel_name);
3377 break;
3378 }
3379 case LTTNG_ENABLE_CHANNEL:
3380 {
aea829b3 3381 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG
3382 &cmd_ctx->lsm->u.channel.chan);
3383 break;
3384 }
3385 case LTTNG_ENABLE_EVENT:
3386 {
3387 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3388 cmd_ctx->lsm->u.enable.channel_name,
3389 &cmd_ctx->lsm->u.enable.event);
3390 break;
3391 }
3392 case LTTNG_ENABLE_ALL_EVENT:
3393 {
2bdd86d4 3394 DBG("Enabling all events");
54d01ffb
DG
3395
3396 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3397 cmd_ctx->lsm->u.enable.channel_name,
3398 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3399 break;
3400 }
052da939 3401 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3402 {
9f19cc17 3403 struct lttng_event *events;
54d01ffb 3404 ssize_t nb_events;
052da939 3405
54d01ffb
DG
3406 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3407 if (nb_events < 0) {
3408 ret = -nb_events;
3409 goto error;
2ef84c95
DG
3410 }
3411
3412 /*
3413 * Setup lttng message with payload size set to the event list size in
3414 * bytes and then copy list into the llm payload.
3415 */
052da939 3416 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3417 if (ret < 0) {
052da939 3418 free(events);
2ef84c95
DG
3419 goto setup_error;
3420 }
3421
3422 /* Copy event list into message payload */
9f19cc17 3423 memcpy(cmd_ctx->llm->payload, events,
052da939 3424 sizeof(struct lttng_event) * nb_events);
2ef84c95 3425
9f19cc17 3426 free(events);
2ef84c95
DG
3427
3428 ret = LTTCOMM_OK;
3429 break;
3430 }
f3ed775e 3431 case LTTNG_START_TRACE:
8c0faa1d 3432 {
54d01ffb 3433 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3434 break;
3435 }
f3ed775e 3436 case LTTNG_STOP_TRACE:
8c0faa1d 3437 {
54d01ffb 3438 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3439 break;
3440 }
5e16da05
MD
3441 case LTTNG_CREATE_SESSION:
3442 {
54d01ffb 3443 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3444 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD
3445 break;
3446 }
3447 case LTTNG_DESTROY_SESSION:
3448 {
54d01ffb
DG
3449 ret = cmd_destroy_session(cmd_ctx->session,
3450 cmd_ctx->lsm->session.name);
5461b305 3451 break;
5e16da05 3452 }
9f19cc17 3453 case LTTNG_LIST_DOMAINS:
5e16da05 3454 {
54d01ffb
DG
3455 ssize_t nb_dom;
3456 struct lttng_domain *domains;
5461b305 3457
54d01ffb
DG
3458 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3459 if (nb_dom < 0) {
3460 ret = -nb_dom;
3461 goto error;
ce3d728c 3462 }
520ff687 3463
54d01ffb 3464 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3465 if (ret < 0) {
3466 goto setup_error;
520ff687 3467 }
57167058 3468
54d01ffb
DG
3469 /* Copy event list into message payload */
3470 memcpy(cmd_ctx->llm->payload, domains,
3471 nb_dom * sizeof(struct lttng_domain));
3472
3473 free(domains);
5e16da05 3474
5461b305 3475 ret = LTTCOMM_OK;
5e16da05
MD
3476 break;
3477 }
9f19cc17 3478 case LTTNG_LIST_CHANNELS:
5e16da05 3479 {
54d01ffb
DG
3480 size_t nb_chan;
3481 struct lttng_channel *channels;
3482
b551a063
DG
3483 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3484 cmd_ctx->session, &channels);
54d01ffb
DG
3485 if (nb_chan < 0) {
3486 ret = -nb_chan;
3487 goto error;
5461b305 3488 }
ca95a216 3489
54d01ffb 3490 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3491 if (ret < 0) {
3492 goto setup_error;
3493 }
9f19cc17 3494
54d01ffb
DG
3495 /* Copy event list into message payload */
3496 memcpy(cmd_ctx->llm->payload, channels,
3497 nb_chan * sizeof(struct lttng_channel));
3498
3499 free(channels);
9f19cc17
DG
3500
3501 ret = LTTCOMM_OK;
5461b305 3502 break;
5e16da05 3503 }
9f19cc17 3504 case LTTNG_LIST_EVENTS:
5e16da05 3505 {
b551a063 3506 ssize_t nb_event;
684d34d2 3507 struct lttng_event *events = NULL;
9f19cc17 3508
b551a063 3509 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3510 cmd_ctx->lsm->u.list.channel_name, &events);
3511 if (nb_event < 0) {
3512 ret = -nb_event;
3513 goto error;
5461b305 3514 }
ca95a216 3515
54d01ffb 3516 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3517 if (ret < 0) {
3518 goto setup_error;
3519 }
9f19cc17 3520
54d01ffb
DG
3521 /* Copy event list into message payload */
3522 memcpy(cmd_ctx->llm->payload, events,
3523 nb_event * sizeof(struct lttng_event));
9f19cc17 3524
54d01ffb 3525 free(events);
9f19cc17
DG
3526
3527 ret = LTTCOMM_OK;
5461b305 3528 break;
5e16da05
MD
3529 }
3530 case LTTNG_LIST_SESSIONS:
3531 {
8e0af1b4 3532 unsigned int nr_sessions;
5461b305 3533
8e0af1b4 3534 session_lock_list();
ca4537d3 3535 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
d32fb093 3536
8e0af1b4 3537 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3538 if (ret < 0) {
54d01ffb 3539 session_unlock_list();
5461b305 3540 goto setup_error;
e065084a 3541 }
5e16da05 3542
6c9cc2ab 3543 /* Filled the session array */
8e0af1b4 3544 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
ca4537d3 3545 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3546
54d01ffb 3547 session_unlock_list();
5e16da05 3548
5461b305 3549 ret = LTTCOMM_OK;
5e16da05
MD
3550 break;
3551 }
d0254c7c
MD
3552 case LTTNG_CALIBRATE:
3553 {
54d01ffb
DG
3554 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3555 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3556 break;
3557 }
d9800920
DG
3558 case LTTNG_REGISTER_CONSUMER:
3559 {
54d01ffb
DG
3560 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3561 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3562 break;
3563 }
5e16da05 3564 default:
5e16da05 3565 ret = LTTCOMM_UND;
5461b305 3566 break;
fac6795d
DG
3567 }
3568
5461b305 3569error:
5461b305
DG
3570 if (cmd_ctx->llm == NULL) {
3571 DBG("Missing llm structure. Allocating one.");
894be886 3572 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3573 goto setup_error;
3574 }
3575 }
54d01ffb 3576 /* Set return code */
5461b305 3577 cmd_ctx->llm->ret_code = ret;
5461b305 3578setup_error:
b5541356 3579 if (cmd_ctx->session) {
54d01ffb 3580 session_unlock(cmd_ctx->session);
b5541356 3581 }
54d01ffb 3582init_setup_error:
8028d920 3583 return ret;
fac6795d
DG
3584}
3585
1d4b027a 3586/*
d063d709
DG
3587 * This thread manage all clients request using the unix client socket for
3588 * communication.
1d4b027a
DG
3589 */
3590static void *thread_manage_clients(void *data)
3591{
5eb91c98
DG
3592 int sock = 0, ret, i, pollfd;
3593 uint32_t revents, nb_fd;
273ea72c 3594 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3595 struct lttng_poll_event events;
1d4b027a
DG
3596
3597 DBG("[thread] Manage client started");
3598
f6a9efaa
DG
3599 rcu_register_thread();
3600
1d4b027a
DG
3601 ret = lttcomm_listen_unix_sock(client_sock);
3602 if (ret < 0) {
3603 goto error;
3604 }
3605
5eb91c98
DG
3606 /*
3607 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3608 * more will be added to this poll set.
3609 */
3610 ret = create_thread_poll_set(&events, 2);
3611 if (ret < 0) {
3612 goto error;
3613 }
273ea72c 3614
5eb91c98
DG
3615 /* Add the application registration socket */
3616 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3617 if (ret < 0) {
3618 goto error;
3619 }
273ea72c 3620
bbd973c2
DG
3621 /*
3622 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3623 */
3624 if (opt_sig_parent) {
8db8d1dc 3625 kill(ppid, SIGUSR1);
1d4b027a
DG
3626 }
3627
3628 while (1) {
1d4b027a 3629 DBG("Accepting client command ...");
273ea72c 3630
5eb91c98
DG
3631 nb_fd = LTTNG_POLL_GETNB(&events);
3632
273ea72c 3633 /* Inifinite blocking call, waiting for transmission */
a8b0b341 3634 restart:
5eb91c98 3635 ret = lttng_poll_wait(&events, -1);
273ea72c 3636 if (ret < 0) {
a8b0b341
MD
3637 /*
3638 * Restart interrupted system call.
3639 */
3640 if (errno == EINTR) {
3641 goto restart;
3642 }
273ea72c
DG
3643 goto error;
3644 }
3645
5eb91c98
DG
3646 for (i = 0; i < nb_fd; i++) {
3647 /* Fetch once the poll data */
3648 revents = LTTNG_POLL_GETEV(&events, i);
3649 pollfd = LTTNG_POLL_GETFD(&events, i);
3650
3651 /* Thread quit pipe has been closed. Killing thread. */
3652 ret = check_thread_quit_pipe(pollfd, revents);
3653 if (ret) {
3654 goto error;
3655 }
3656
3657 /* Event on the registration socket */
3658 if (pollfd == client_sock) {
3659 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3660 ERR("Client socket poll error");
3661 goto error;
3662 }
3663 }
3664 }
3665
3666 DBG("Wait for client response");
3667
3668 sock = lttcomm_accept_unix_sock(client_sock);
3669 if (sock < 0) {
273ea72c 3670 goto error;
273ea72c
DG
3671 }
3672
be040666
DG
3673 /* Set socket option for credentials retrieval */
3674 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3675 if (ret < 0) {
3676 goto error;
3677 }
3678
5eb91c98 3679 /* Allocate context command to process the client request */
ba7f0ae5 3680 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3681 if (cmd_ctx == NULL) {
ba7f0ae5 3682 perror("zmalloc cmd_ctx");
1d4b027a 3683 goto error;
5eb91c98 3684 }
1d4b027a 3685
5eb91c98 3686 /* Allocate data buffer for reception */
ba7f0ae5 3687 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3688 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3689 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG
3690 goto error;
3691 }
1d4b027a 3692
5eb91c98
DG
3693 cmd_ctx->llm = NULL;
3694 cmd_ctx->session = NULL;
1d4b027a 3695
5eb91c98
DG
3696 /*
3697 * Data is received from the lttng client. The struct
3698 * lttcomm_session_msg (lsm) contains the command and data request of
3699 * the client.
3700 */
3701 DBG("Receiving data from client ...");
be040666
DG
3702 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3703 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG
3704 if (ret <= 0) {
3705 DBG("Nothing recv() from client... continuing");
3706 close(sock);
3707 free(cmd_ctx);
3708 continue;
3709 }
1d4b027a 3710
5eb91c98
DG
3711 // TODO: Validate cmd_ctx including sanity check for
3712 // security purpose.
f7776ea7 3713
f6a9efaa 3714 rcu_thread_online();
5eb91c98
DG
3715 /*
3716 * This function dispatch the work to the kernel or userspace tracer
3717 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3718 * informations for the client. The command context struct contains
3719 * everything this function may needs.
3720 */
3721 ret = process_client_msg(cmd_ctx);
f6a9efaa 3722 rcu_thread_offline();
5eb91c98 3723 if (ret < 0) {
bbd973c2 3724 /*
5eb91c98 3725 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3726 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3727 * (ENOMEM). Error detected but still accept command.
bbd973c2 3728 */
bbd973c2 3729 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3730 continue;
3731 }
d6e4fca4 3732
54d01ffb
DG
3733 DBG("Sending response (size: %d, retcode: %s)",
3734 cmd_ctx->lttng_msg_size,
9a745bc7 3735 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3736 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
3737 if (ret < 0) {
3738 ERR("Failed to send data back to client");
bbd973c2 3739 }
1d4b027a 3740
5eb91c98 3741 /* End of transmission */
273ea72c 3742 close(sock);
be040666
DG
3743
3744 clean_command_ctx(&cmd_ctx);
273ea72c
DG
3745 }
3746
5eb91c98
DG
3747error:
3748 DBG("Client thread dying");
273ea72c 3749 unlink(client_unix_sock_path);
5eb91c98
DG
3750 close(client_sock);
3751 close(sock);
273ea72c 3752
5eb91c98 3753 lttng_poll_clean(&events);
a2fb29a5 3754 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG
3755
3756 rcu_unregister_thread();
1d4b027a
DG
3757 return NULL;
3758}
3759
3760
fac6795d
DG
3761/*
3762 * usage function on stderr
3763 */
3764static void usage(void)
3765{
b716ce68 3766 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
3767 fprintf(stderr, " -h, --help Display this usage.\n");
3768 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3769 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3770 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3771 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD
3772 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3773 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3774 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3775 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD
3776 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3777 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3778 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3779 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG
3780 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3781 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3782 fprintf(stderr, " -V, --version Show version number.\n");
3783 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3784 fprintf(stderr, " -q, --quiet No output at all.\n");
3785 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3786 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3787 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG
3788}
3789
3790/*
3791 * daemon argument parsing
3792 */
3793static int parse_args(int argc, char **argv)
3794{
3795 int c;
3796
3797 static struct option long_options[] = {
3798 { "client-sock", 1, 0, 'c' },
3799 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD
3800 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3801 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD
3802 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3803 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD
3804 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3805 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3806 { "consumerd32-path", 1, 0, 'u' },
3807 { "consumerd32-libdir", 1, 0, 'U' },
3808 { "consumerd64-path", 1, 0, 't' },
3809 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3810 { "daemonize", 0, 0, 'd' },
5b8719f5 3811 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3812 { "help", 0, 0, 'h' },
3813 { "group", 1, 0, 'g' },
3814 { "version", 0, 0, 'V' },
75462a81 3815 { "quiet", 0, 0, 'q' },
3f9947db 3816 { "verbose", 0, 0, 'v' },
3bd1e081 3817 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3818 { "no-kernel", 0, 0, 'N' },
fac6795d
DG
3819 { NULL, 0, 0, 0 }
3820 };
3821
3822 while (1) {
3823 int option_index = 0;
4fba7219 3824 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3825 long_options, &option_index);
fac6795d
DG
3826 if (c == -1) {
3827 break;
3828 }
3829
3830 switch (c) {
3831 case 0:
3832 fprintf(stderr, "option %s", long_options[option_index].name);
3833 if (optarg) {
3834 fprintf(stderr, " with arg %s\n", optarg);
3835 }
3836 break;
b716ce68 3837 case 'c':
fac6795d
DG
3838 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3839 break;
3840 case 'a':
3841 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3842 break;
3843 case 'd':
3844 opt_daemon = 1;
3845 break;
3846 case 'g':
fb09408a 3847 opt_tracing_group = optarg;
fac6795d
DG
3848 break;
3849 case 'h':
3850 usage();
3851 exit(EXIT_FAILURE);
3852 case 'V':
3853 fprintf(stdout, "%s\n", VERSION);
3854 exit(EXIT_SUCCESS);
5b8719f5
DG
3855 case 'S':
3856 opt_sig_parent = 1;
3857 break;
d6f42150 3858 case 'E':
3bd1e081 3859 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG
3860 break;
3861 case 'C':
3bd1e081
MD
3862 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3863 break;
3864 case 'F':
7753dea8 3865 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD
3866 break;
3867 case 'D':
7753dea8
MD
3868 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3869 break;
3870 case 'H':
3871 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3872 break;
3873 case 'G':
3874 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3875 break;
4fba7219
DG
3876 case 'N':
3877 opt_no_kernel = 1;
3878 break;
75462a81
DG
3879 case 'q':
3880 opt_quiet = 1;
3881 break;
3f9947db 3882 case 'v':
53086306
DG
3883 /* Verbose level can increase using multiple -v */
3884 opt_verbose += 1;
3f9947db 3885 break;
31f73cc9 3886 case 'Z':
3bd1e081 3887 opt_verbose_consumer += 1;
31f73cc9 3888 break;
fb09408a 3889 case 'u':
fc7a59ce 3890 consumerd32_bin= optarg;
ebaeda94
MD
3891 break;
3892 case 'U':
3893 consumerd32_libdir = optarg;
7753dea8
MD
3894 break;
3895 case 't':
fc7a59ce 3896 consumerd64_bin = optarg;
ebaeda94
MD
3897 break;
3898 case 'T':
3899 consumerd64_libdir = optarg;
fb09408a 3900 break;
fac6795d
DG
3901 default:
3902 /* Unknown option or other error.
3903 * Error is printed by getopt, just return */
3904 return -1;
3905 }
3906 }
3907
3908 return 0;
3909}
3910
3911/*
d063d709 3912 * Creates the two needed socket by the daemon.
d6f42150
DG
3913 * apps_sock - The communication socket for all UST apps.
3914 * client_sock - The communication of the cli tool (lttng).
fac6795d 3915 */
cf3af59e 3916static int init_daemon_socket(void)
fac6795d
DG
3917{
3918 int ret = 0;
3919 mode_t old_umask;
3920
3921 old_umask = umask(0);
3922
3923 /* Create client tool unix socket */
d6f42150
DG
3924 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3925 if (client_sock < 0) {
3926 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
3927 ret = -1;
3928 goto end;
3929 }
3930
3931 /* File permission MUST be 660 */
3932 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3933 if (ret < 0) {
d6f42150 3934 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
3935 perror("chmod");
3936 goto end;
3937 }
3938
3939 /* Create the application unix socket */
d6f42150
DG
3940 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3941 if (apps_sock < 0) {
3942 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
3943 ret = -1;
3944 goto end;
3945 }
3946
d6f42150 3947 /* File permission MUST be 666 */
54d01ffb
DG
3948 ret = chmod(apps_unix_sock_path,
3949 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3950 if (ret < 0) {
d6f42150 3951 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
3952 perror("chmod");
3953 goto end;
3954 }
3955
3956end:
3957 umask(old_umask);
3958 return ret;
3959}
3960
3961/*
54d01ffb
DG
3962 * Check if the global socket is available, and if a daemon is answering at the
3963 * other side. If yes, error is returned.
fac6795d 3964 */
cf3af59e 3965static int check_existing_daemon(void)
fac6795d 3966{
7d8234d9 3967 /* Is there anybody out there ? */
099e26bd 3968 if (lttng_session_daemon_alive()) {
7d8234d9 3969 return -EEXIST;
099e26bd 3970 }
b09c7c76
DG
3971
3972 return 0;
fac6795d
DG
3973}
3974
fac6795d 3975/*
d063d709 3976 * Set the tracing group gid onto the client socket.
5e16da05 3977 *
d063d709 3978 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 3979 * permissive (root.root) to less permissive (root.tracing).
fac6795d 3980 */
be040666 3981static int set_permissions(char *rundir)
fac6795d
DG
3982{
3983 int ret;
996b65c8 3984 gid_t gid;
fac6795d 3985
996b65c8
MD
3986 gid = allowed_group();
3987 if (gid < 0) {
be040666
DG
3988 WARN("No tracing group detected");
3989 ret = 0;
fac6795d
DG
3990 goto end;
3991 }
3992
d6f42150 3993 /* Set lttng run dir */
be040666 3994 ret = chown(rundir, 0, gid);
d6f42150 3995 if (ret < 0) {
be040666 3996 ERR("Unable to set group on %s", rundir);
d6f42150
DG
3997 perror("chown");
3998 }
3999
d1613cf5 4000 /* Ensure tracing group can search the run dir */
61076f74 4001 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
d1613cf5
JN
4002 if (ret < 0) {
4003 ERR("Unable to set permissions on %s", rundir);
4004 perror("chmod");
4005 }
4006
d6f42150 4007 /* lttng client socket path */
996b65c8 4008 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4009 if (ret < 0) {
d6f42150
DG
4010 ERR("Unable to set group on %s", client_unix_sock_path);
4011 perror("chown");
4012 }
4013
3bd1e081
MD
4014 /* kconsumer error socket path */
4015 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4016 if (ret < 0) {
3bd1e081
MD
4017 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4018 perror("chown");
4019 }
4020
7753dea8
MD
4021 /* 64-bit ustconsumer error socket path */
4022 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4023 if (ret < 0) {
4024 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4025 perror("chown");
4026 }
4027
4028 /* 32-bit ustconsumer compat32 error socket path */
4029 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4030 if (ret < 0) {
7753dea8 4031 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG
4032 perror("chown");
4033 }
4034
d6f42150 4035 DBG("All permissions are set");
e07ae692 4036
fac6795d
DG
4037end:
4038 return ret;
4039}
4040
7a485870 4041/*
d063d709 4042 * Create the pipe used to wake up the kernel thread.
7a485870
DG
4043 */
4044static int create_kernel_poll_pipe(void)
4045{
ca4537d3 4046 return pipe2(kernel_poll_pipe, O_CLOEXEC);
7a485870
DG
4047}
4048
099e26bd
DG
4049/*
4050 * Create the application command pipe to wake thread_manage_apps.
4051 */
4052static int create_apps_cmd_pipe(void)
4053{
ca4537d3 4054 return pipe2(apps_cmd_pipe, O_CLOEXEC);
099e26bd
DG
4055}
4056
d6f42150 4057/*
d063d709 4058 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4059 */
67e40797 4060static int create_lttng_rundir(const char *rundir)
d6f42150
DG
4061{
4062 int ret;
4063
67e40797
DG
4064 DBG3("Creating LTTng run directory: %s", rundir);
4065
d1613cf5 4066 ret = mkdir(rundir, S_IRWXU);
d6f42150 4067 if (ret < 0) {
b1f11e69 4068 if (errno != EEXIST) {
67e40797 4069 ERR("Unable to create %s", rundir);
b1f11e69
DG
4070 goto error;
4071 } else {
4072 ret = 0;
4073 }
d6f42150
DG
4074 }
4075
4076error:
4077 return ret;
4078}
4079
4080/*
d063d709
DG
4081 * Setup sockets and directory needed by the kconsumerd communication with the
4082 * session daemon.
d6f42150 4083 */
67e40797
DG
4084static int set_consumer_sockets(struct consumer_data *consumer_data,
4085 const char *rundir)
d6f42150
DG
4086{
4087 int ret;
67e40797 4088 char path[PATH_MAX];
d6f42150 4089
67e40797 4090 switch (consumer_data->type) {
7753dea8 4091 case LTTNG_CONSUMER_KERNEL:
60922cb0 4092 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD
4093 break;
4094 case LTTNG_CONSUMER64_UST:
60922cb0 4095 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD
4096 break;
4097 case LTTNG_CONSUMER32_UST:
60922cb0 4098 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD
4099 break;
4100 default:
4101 ERR("Consumer type unknown");
4102 ret = -EINVAL;
4103 goto error;
d6f42150
DG
4104 }
4105
67e40797
DG
4106 DBG2("Creating consumer directory: %s", path);
4107
d1613cf5 4108 ret = mkdir(path, S_IRWXU);
d6f42150 4109 if (ret < 0) {
6beb2242 4110 if (errno != EEXIST) {
3bd1e081 4111 ERR("Failed to create %s", path);
6beb2242
DG
4112 goto error;
4113 }
4114 ret = 0;
d6f42150
DG
4115 }
4116
4117 /* Create the kconsumerd error unix socket */
3bd1e081
MD
4118 consumer_data->err_sock =
4119 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4120 if (consumer_data->err_sock < 0) {
4121 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG
4122 ret = -1;
4123 goto error;
4124 }
4125
4126 /* File permission MUST be 660 */
3bd1e081 4127 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4128 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4129 if (ret < 0) {
3bd1e081 4130 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4131 PERROR("chmod");
d6f42150
DG
4132 goto error;
4133 }
4134
4135error:
4136 return ret;
4137}
4138
fac6795d 4139/*
d063d709 4140 * Signal handler for the daemon
cf3af59e 4141 *
54d01ffb
DG
4142 * Simply stop all worker threads, leaving main() return gracefully after
4143 * joining all threads and calling cleanup().
fac6795d
DG
4144 */
4145static void sighandler(int sig)
4146{
4147 switch (sig) {
cf3af59e 4148 case SIGPIPE:
af87c45a 4149 DBG("SIGPIPE caught");
cf3af59e
MD
4150 return;
4151 case SIGINT:
af87c45a 4152 DBG("SIGINT caught");
cf3af59e
MD
4153 stop_threads();
4154 break;
4155 case SIGTERM:
af87c45a 4156 DBG("SIGTERM caught");
cf3af59e
MD
4157 stop_threads();
4158 break;
4159 default:
4160 break;
fac6795d 4161 }
fac6795d
DG
4162}
4163
4164/*
d063d709 4165 * Setup signal handler for :
1d4b027a 4166 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4167 */
1d4b027a 4168static int set_signal_handler(void)
fac6795d 4169{
1d4b027a
DG
4170 int ret = 0;
4171 struct sigaction sa;
4172 sigset_t sigset;
fac6795d 4173
1d4b027a
DG
4174 if ((ret = sigemptyset(&sigset)) < 0) {
4175 perror("sigemptyset");
4176 return ret;
4177 }
d6f42150 4178
1d4b027a
DG
4179 sa.sa_handler = sighandler;
4180 sa.sa_mask = sigset;
4181 sa.sa_flags = 0;
4182 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4183 perror("sigaction");
4184 return ret;
d6f42150
DG
4185 }
4186
1d4b027a
DG
4187 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4188 perror("sigaction");
4189 return ret;
d6f42150 4190 }
aaf26714 4191
1d4b027a
DG
4192 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4193 perror("sigaction");
4194 return ret;
8c0faa1d
DG
4195 }
4196
1d4b027a
DG
4197 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4198
4199 return ret;
fac6795d
DG
4200}
4201
f3ed775e 4202/*
d063d709
DG
4203 * Set open files limit to unlimited. This daemon can open a large number of
4204 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
4205 */
4206static void set_ulimit(void)
4207{
4208 int ret;
4209 struct rlimit lim;
4210
a88df331 4211 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
4212 lim.rlim_cur = 65535;
4213 lim.rlim_max = 65535;
4214
4215 ret = setrlimit(RLIMIT_NOFILE, &lim);
4216 if (ret < 0) {
4217 perror("failed to set open files limit");
4218 }
4219}
4220
fac6795d
DG
4221/*
4222 * main
4223 */
4224int main(int argc, char **argv)
4225{
fac6795d
DG
4226 int ret = 0;
4227 void *status;
b082db07 4228 const char *home_path;
fac6795d 4229
335a95b7
MD
4230 init_kernel_workarounds();
4231
f6a9efaa
DG
4232 rcu_register_thread();
4233
273ea72c 4234 /* Create thread quit pipe */
cf3af59e
MD
4235 if ((ret = init_thread_quit_pipe()) < 0) {
4236 goto error;
273ea72c
DG
4237 }
4238
7753dea8 4239 setup_consumerd_path();
fb09408a 4240
fac6795d
DG
4241 /* Parse arguments */
4242 progname = argv[0];
4243 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4244 goto error;
fac6795d
DG
4245 }
4246
4247 /* Daemonize */
4248 if (opt_daemon) {
53094c05
DG
4249 ret = daemon(0, 0);
4250 if (ret < 0) {
4251 perror("daemon");
cf3af59e 4252 goto error;
53094c05 4253 }
fac6795d
DG
4254 }
4255
4256 /* Check if daemon is UID = 0 */
4257 is_root = !getuid();
4258
fac6795d 4259 if (is_root) {
990570ed 4260 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG
4261
4262 /* Create global run dir with root access */
4263 ret = create_lttng_rundir(rundir);
d6f42150 4264 if (ret < 0) {
cf3af59e 4265 goto error;
d6f42150
DG
4266 }
4267
fac6795d 4268 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
4269 snprintf(apps_unix_sock_path, PATH_MAX,
4270 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
4271 }
4272
4273 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
4274 snprintf(client_unix_sock_path, PATH_MAX,
4275 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4276 }
0fdd1e2c
DG
4277
4278 /* Set global SHM for ust */
4279 if (strlen(wait_shm_path) == 0) {
4280 snprintf(wait_shm_path, PATH_MAX,
4281 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4282 }
67e40797
DG
4283
4284 /* Setup kernel consumerd path */
4285 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4286 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4287 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4288 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG
4289
4290 DBG2("Kernel consumer err path: %s",
4291 kconsumer_data.err_unix_sock_path);
4292 DBG2("Kernel consumer cmd path: %s",
4293 kconsumer_data.cmd_unix_sock_path);
fac6795d 4294 } else {
b082db07
DG
4295 home_path = get_home_dir();
4296 if (home_path == NULL) {
273ea72c
DG
4297 /* TODO: Add --socket PATH option */
4298 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
4299 ret = -EPERM;
4300 goto error;
b082db07
DG
4301 }
4302
67e40797
DG
4303 /*
4304 * Create rundir from home path. This will create something like
4305 * $HOME/.lttng
4306 */
990570ed 4307 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG
4308 if (ret < 0) {
4309 ret = -ENOMEM;
4310 goto error;
4311 }
4312
4313 ret = create_lttng_rundir(rundir);
4314 if (ret < 0) {
4315 goto error;
4316 }
4317
fac6795d 4318 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4319 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4320 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
4321 }
4322
4323 /* Set the cli tool unix socket path */
4324 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4325 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4326 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4327 }
0fdd1e2c
DG
4328
4329 /* Set global SHM for ust */
4330 if (strlen(wait_shm_path) == 0) {
4331 snprintf(wait_shm_path, PATH_MAX,
4332 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4333 }
fac6795d
DG
4334 }
4335
847177cd
DG
4336 DBG("Client socket path %s", client_unix_sock_path);
4337 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG
4338 DBG("LTTng run directory path: %s", rundir);
4339
4340 /* 32 bits consumerd path setup */
4341 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4342 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4343 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4344 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG
4345
4346 DBG2("UST consumer 32 bits err path: %s",
4347 ustconsumer32_data.err_unix_sock_path);
4348 DBG2("UST consumer 32 bits cmd path: %s",
4349 ustconsumer32_data.cmd_unix_sock_path);
4350
4351 /* 64 bits consumerd path setup */
4352 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4353 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4354 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4355 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG
4356
4357 DBG2("UST consumer 64 bits err path: %s",
4358 ustconsumer64_data.err_unix_sock_path);
4359 DBG2("UST consumer 64 bits cmd path: %s",
4360 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4361
273ea72c 4362 /*
7d8234d9 4363 * See if daemon already exist.
fac6795d 4364 */
7d8234d9 4365 if ((ret = check_existing_daemon()) < 0) {
75462a81 4366 ERR("Already running daemon.\n");
273ea72c 4367 /*
cf3af59e
MD
4368 * We do not goto exit because we must not cleanup()
4369 * because a daemon is already running.
ab118b20 4370 */
cf3af59e 4371 goto error;
a88df331
DG
4372 }
4373
54d01ffb 4374 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG
4375
4376 /*
4377 * These actions must be executed as root. We do that *after* setting up
4378 * the sockets path because we MUST make the check for another daemon using
4379 * those paths *before* trying to set the kernel consumer sockets and init
4380 * kernel tracer.
4381 */
4382 if (is_root) {
67e40797 4383 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD
4384 if (ret < 0) {
4385 goto exit;
4386 }
4387
a88df331 4388 /* Setup kernel tracer */
4fba7219
DG
4389 if (!opt_no_kernel) {
4390 init_kernel_tracer();
4391 }
a88df331
DG
4392
4393 /* Set ulimit for open files */
4394 set_ulimit();
fac6795d
DG
4395 }
4396
67e40797
DG
4397 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4398 if (ret < 0) {
4399 goto exit;
4400 }
4401
4402 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4403 if (ret < 0) {
4404 goto exit;
4405 }
4406
cf3af59e
MD
4407 if ((ret = set_signal_handler()) < 0) {
4408 goto exit;
fac6795d
DG
4409 }
4410
d6f42150 4411 /* Setup the needed unix socket */
cf3af59e
MD
4412 if ((ret = init_daemon_socket()) < 0) {
4413 goto exit;
fac6795d
DG
4414 }
4415
4416 /* Set credentials to socket */
be040666 4417 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4418 goto exit;
fac6795d
DG
4419 }
4420
5b8719f5
DG
4421 /* Get parent pid if -S, --sig-parent is specified. */
4422 if (opt_sig_parent) {
4423 ppid = getppid();
4424 }
4425
7a485870 4426 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD
4427 if ((ret = create_kernel_poll_pipe()) < 0) {
4428 goto exit;
7a485870
DG
4429 }
4430
099e26bd
DG
4431 /* Setup the thread apps communication pipe. */
4432 if ((ret = create_apps_cmd_pipe()) < 0) {
4433 goto exit;
4434 }
4435
4436 /* Init UST command queue. */
4437 cds_wfq_init(&ust_cmd_queue.queue);
4438
f6a9efaa
DG
4439 /* Init UST app hash table */
4440 ust_app_ht_alloc();
4441
273ea72c 4442 /*
54d01ffb
DG
4443 * Get session list pointer. This pointer MUST NOT be free(). This list is
4444 * statically declared in session.c
273ea72c 4445 */
54d01ffb 4446 session_list_ptr = session_get_list();
b5541356 4447
5eb91c98
DG
4448 /* Set up max poll set size */
4449 lttng_poll_set_max_size();
4450
cf3af59e 4451 /* Create thread to manage the client socket */
099e26bd
DG
4452 ret = pthread_create(&client_thread, NULL,
4453 thread_manage_clients, (void *) NULL);
cf3af59e 4454 if (ret != 0) {
099e26bd 4455 perror("pthread_create clients");
cf3af59e
MD
4456 goto exit_client;
4457 }
fac6795d 4458
099e26bd
DG
4459 /* Create thread to dispatch registration */
4460 ret = pthread_create(&dispatch_thread, NULL,
4461 thread_dispatch_ust_registration, (void *) NULL);
4462 if (ret != 0) {
4463 perror("pthread_create dispatch");
4464 goto exit_dispatch;
4465 }
4466
4467 /* Create thread to manage application registration. */
4468 ret = pthread_create(&reg_apps_thread, NULL,
4469 thread_registration_apps, (void *) NULL);
4470 if (ret != 0) {
4471 perror("pthread_create registration");
4472 goto exit_reg_apps;
4473 }
4474
cf3af59e 4475 /* Create thread to manage application socket */
54d01ffb
DG
4476 ret = pthread_create(&apps_thread, NULL,
4477 thread_manage_apps, (void *) NULL);
cf3af59e 4478 if (ret != 0) {
099e26bd 4479 perror("pthread_create apps");
cf3af59e
MD
4480 goto exit_apps;
4481 }
fac6795d 4482
cf3af59e 4483 /* Create kernel thread to manage kernel event */
54d01ffb
DG
4484 ret = pthread_create(&kernel_thread, NULL,
4485 thread_manage_kernel, (void *) NULL);
cf3af59e 4486 if (ret != 0) {
099e26bd 4487 perror("pthread_create kernel");
cf3af59e
MD
4488 goto exit_kernel;
4489 }
7a485870 4490
cf3af59e
MD
4491 ret = pthread_join(kernel_thread, &status);
4492 if (ret != 0) {
4493 perror("pthread_join");
4494 goto error; /* join error, exit without cleanup */
fac6795d
DG
4495 }
4496
cf3af59e
MD
4497exit_kernel:
4498 ret = pthread_join(apps_thread, &status);
4499 if (ret != 0) {
4500 perror("pthread_join");
4501 goto error; /* join error, exit without cleanup */
4502 }
fac6795d 4503
cf3af59e 4504exit_apps:
099e26bd
DG
4505 ret = pthread_join(reg_apps_thread, &status);
4506 if (ret != 0) {
4507 perror("pthread_join");
4508 goto error; /* join error, exit without cleanup */
4509 }
4510
4511exit_reg_apps:
4512 ret = pthread_join(dispatch_thread, &status);
4513 if (ret != 0) {
4514 perror("pthread_join");
4515 goto error; /* join error, exit without cleanup */
4516 }
4517
4518exit_dispatch:
cf3af59e
MD
4519 ret = pthread_join(client_thread, &status);
4520 if (ret != 0) {
4521 perror("pthread_join");
4522 goto error; /* join error, exit without cleanup */
4523 }
4524
3bd1e081 4525 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4526 if (ret != 0) {
3bd1e081 4527 perror("join_consumer");
cf3af59e
MD
4528 goto error; /* join error, exit without cleanup */
4529 }
a88df331 4530
cf3af59e 4531exit_client:
a88df331 4532exit:
cf3af59e
MD
4533 /*
4534 * cleanup() is called when no other thread is running.
4535 */
f6a9efaa 4536 rcu_thread_online();
cf3af59e 4537 cleanup();
f6a9efaa
DG
4538 rcu_thread_offline();
4539 rcu_unregister_thread();
67e40797 4540 if (!ret) {
cf3af59e 4541 exit(EXIT_SUCCESS);
67e40797 4542 }
cf3af59e 4543error:
5e16da05 4544 exit(EXIT_FAILURE);
fac6795d 4545}
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