Fix: close all file descriptors when executed as daemon
[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 *
d14d33bf
AM
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
91d76f53 8 *
d14d33bf
AM
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
91d76f53 13 *
d14d33bf
AM
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
fac6795d
DG
20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
8c0faa1d 24#include <semaphore.h>
fac6795d
DG
25#include <signal.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
0fdd1e2c 29#include <sys/mman.h>
b73401da 30#include <sys/mount.h>
1e307fab 31#include <sys/resource.h>
fac6795d
DG
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
0fdd1e2c 35#include <sys/wait.h>
5c827ce0 36#include <urcu/uatomic.h>
fac6795d 37#include <unistd.h>
3bd1e081 38#include <config.h>
fac6795d 39
990570ed 40#include <common/common.h>
0ba98ebc 41#include <common/compat/poll.h>
d27c42b8 42#include <common/compat/socket.h>
db758600
DG
43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
50c8f484 46#include <common/futex.h>
fac6795d 47
10a8a223 48#include "lttng-sessiond.h"
54d01ffb 49#include "channel.h"
099e26bd 50#include "context.h"
54d01ffb 51#include "event.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"
4063050c 57#include "fd-limit.h"
fac6795d 58
ebaeda94
MD
59#define CONSUMERD_FILE "lttng-consumerd"
60
3bd1e081
MD
61struct consumer_data {
62 enum lttng_consumer_type type;
63
64 pthread_t thread; /* Worker thread interacting with the consumer */
65 sem_t sem;
66
67 /* Mutex to control consumerd pid assignation */
68 pthread_mutex_t pid_mutex;
69 pid_t pid;
70
71 int err_sock;
72 int cmd_sock;
73
74 /* consumer error and command Unix socket path */
75 char err_unix_sock_path[PATH_MAX];
76 char cmd_unix_sock_path[PATH_MAX];
77};
78
75462a81 79/* Const values */
686204ab 80const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 81const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
82const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
83const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
84
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85const char *progname;
86const char *opt_tracing_group;
5b8719f5 87static int opt_sig_parent;
97e19046 88static int opt_verbose_consumer;
fac6795d 89static int opt_daemon;
4fba7219 90static int opt_no_kernel;
fac6795d 91static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 92static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 93static char *rundir;
3bd1e081
MD
94
95/* Consumer daemon specific control data */
96static struct consumer_data kconsumer_data = {
97 .type = LTTNG_CONSUMER_KERNEL,
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98 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
99 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
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100 .err_sock = -1,
101 .cmd_sock = -1,
3bd1e081 102};
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MD
103static struct consumer_data ustconsumer64_data = {
104 .type = LTTNG_CONSUMER64_UST,
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105 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
106 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
03550b58
MD
107 .err_sock = -1,
108 .cmd_sock = -1,
7753dea8
MD
109};
110static struct consumer_data ustconsumer32_data = {
111 .type = LTTNG_CONSUMER32_UST,
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112 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
113 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
03550b58
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114 .err_sock = -1,
115 .cmd_sock = -1,
3bd1e081
MD
116};
117
099e26bd 118static int dispatch_thread_exit;
fac6795d 119
54d01ffb
DG
120/* Global application Unix socket path */
121static char apps_unix_sock_path[PATH_MAX];
122/* Global client Unix socket path */
123static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
124/* global wait shm path for UST */
125static char wait_shm_path[PATH_MAX];
fac6795d 126
1d4b027a 127/* Sockets and FDs */
a4b35e07
MD
128static int client_sock = -1;
129static int apps_sock = -1;
130static int kernel_tracer_fd = -1;
76d7553f 131static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 132
273ea72c
DG
133/*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
76d7553f 137static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 138
099e26bd
DG
139/*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
76d7553f 143static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 144
1d4b027a 145/* Pthread, Mutexes and Semaphores */
1d4b027a 146static pthread_t apps_thread;
099e26bd 147static pthread_t reg_apps_thread;
1d4b027a 148static pthread_t client_thread;
7a485870 149static pthread_t kernel_thread;
099e26bd 150static pthread_t dispatch_thread;
5eb91c98 151
fac6795d 152
099e26bd
DG
153/*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160static struct ust_cmd_queue ust_cmd_queue;
161
b5541356
DG
162/*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
04ea676f 168 *
d063d709 169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 170 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
171 */
172static struct ltt_session_list *session_list_ptr;
173
7753dea8
MD
174int ust_consumerd64_fd = -1;
175int ust_consumerd32_fd = -1;
176
fb6f1fa2
YB
177static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
178static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
179static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
180static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a 181
5c827ce0
DG
182/*
183 * Consumer daemon state which is changed when spawning it, killing it or in
184 * case of a fatal error.
185 */
186enum consumerd_state {
187 CONSUMER_STARTED = 1,
188 CONSUMER_STOPPED = 2,
189 CONSUMER_ERROR = 3,
190};
191
192/*
193 * This consumer daemon state is used to validate if a client command will be
194 * able to reach the consumer. If not, the client is informed. For instance,
195 * doing a "lttng start" when the consumer state is set to ERROR will return an
196 * error to the client.
197 *
198 * The following example shows a possible race condition of this scheme:
199 *
200 * consumer thread error happens
201 * client cmd arrives
202 * client cmd checks state -> still OK
203 * consumer thread exit, sets error
204 * client cmd try to talk to consumer
205 * ...
206 *
207 * However, since the consumer is a different daemon, we have no way of making
208 * sure the command will reach it safely even with this state flag. This is why
209 * we consider that up to the state validation during command processing, the
210 * command is safe. After that, we can not guarantee the correctness of the
211 * client request vis-a-vis the consumer.
212 */
213static enum consumerd_state ust_consumerd_state;
214static enum consumerd_state kernel_consumerd_state;
215
fb09408a 216static
7753dea8 217void setup_consumerd_path(void)
fb09408a 218{
fc7a59ce 219 const char *bin, *libdir;
fb09408a 220
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MD
221 /*
222 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
223 * native architecture size consumer if CONFIG_CONSUMER*_PATH
224 * has not been defined.
7753dea8 225 */
ebaeda94 226#if (CAA_BITS_PER_LONG == 32)
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AM
227 if (!consumerd32_bin[0]) {
228 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
229 }
230 if (!consumerd32_libdir[0]) {
231 consumerd32_libdir = INSTALL_LIB_PATH;
232 }
233#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
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234 if (!consumerd64_bin[0]) {
235 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 236 }
ebaeda94
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237 if (!consumerd64_libdir[0]) {
238 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
239 }
240#else
241#error "Unknown bitness"
242#endif
243
fb09408a
MD
244 /*
245 * runtime env. var. overrides the build default.
246 */
fc7a59ce
AM
247 bin = getenv("LTTNG_CONSUMERD32_BIN");
248 if (bin) {
249 consumerd32_bin = bin;
7753dea8 250 }
fc7a59ce
AM
251 bin = getenv("LTTNG_CONSUMERD64_BIN");
252 if (bin) {
253 consumerd64_bin = bin;
ebaeda94 254 }
72f579ee 255 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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MD
256 if (libdir) {
257 consumerd32_libdir = libdir;
258 }
72f579ee 259 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
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260 if (libdir) {
261 consumerd64_libdir = libdir;
fb09408a
MD
262 }
263}
264
5eb91c98
DG
265/*
266 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
267 */
268static int create_thread_poll_set(struct lttng_poll_event *events,
269 unsigned int size)
270{
271 int ret;
272
273 if (events == NULL || size == 0) {
274 ret = -1;
275 goto error;
276 }
277
278 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
279 if (ret < 0) {
280 goto error;
281 }
282
283 /* Add quit pipe */
284 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
285 if (ret < 0) {
286 goto error;
287 }
288
289 return 0;
290
291error:
292 return ret;
293}
294
295/*
296 * Check if the thread quit pipe was triggered.
297 *
298 * Return 1 if it was triggered else 0;
299 */
300static int check_thread_quit_pipe(int fd, uint32_t events)
301{
302 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
303 return 1;
304 }
305
306 return 0;
307}
308
0fdd1e2c
DG
309/*
310 * Return group ID of the tracing group or -1 if not found.
311 */
996b65c8
MD
312static gid_t allowed_group(void)
313{
314 struct group *grp;
315
274e143b
MD
316 if (opt_tracing_group) {
317 grp = getgrnam(opt_tracing_group);
318 } else {
319 grp = getgrnam(default_tracing_group);
320 }
996b65c8
MD
321 if (!grp) {
322 return -1;
323 } else {
324 return grp->gr_gid;
325 }
326}
327
273ea72c 328/*
5eb91c98 329 * Init thread quit pipe.
273ea72c
DG
330 *
331 * Return -1 on error or 0 if all pipes are created.
332 */
333static int init_thread_quit_pipe(void)
334{
730389d9 335 int ret, i;
273ea72c 336
730389d9 337 ret = pipe(thread_quit_pipe);
273ea72c 338 if (ret < 0) {
730389d9 339 PERROR("thread quit pipe");
273ea72c
DG
340 goto error;
341 }
342
730389d9
DG
343 for (i = 0; i < 2; i++) {
344 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
345 if (ret < 0) {
346 PERROR("fcntl");
347 goto error;
348 }
349 }
350
273ea72c
DG
351error:
352 return ret;
353}
354
fac6795d 355/*
d063d709
DG
356 * Complete teardown of a kernel session. This free all data structure related
357 * to a kernel session and update counter.
fac6795d 358 */
1d4b027a 359static void teardown_kernel_session(struct ltt_session *session)
fac6795d 360{
8f7a84dd 361 if (!session->kernel_session) {
99bab54f 362 DBG3("No kernel session when tearing down session");
84ea9c99 363 return;
8f7a84dd
DG
364 }
365
84ea9c99 366 DBG("Tearing down kernel session");
d9800920 367
84ea9c99
MD
368 /*
369 * If a custom kernel consumer was registered, close the socket before
370 * tearing down the complete kernel session structure
371 */
03550b58
MD
372 if (kconsumer_data.cmd_sock >= 0 &&
373 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
84ea9c99 374 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 375 }
84ea9c99
MD
376
377 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
378}
379
f6a9efaa
DG
380/*
381 * Complete teardown of all UST sessions. This will free everything on his path
382 * and destroy the core essence of all ust sessions :)
383 */
384static void teardown_ust_session(struct ltt_session *session)
385{
84cd17c6
MD
386 int ret;
387
8f7a84dd 388 if (!session->ust_session) {
99bab54f 389 DBG3("No UST session when tearing down session");
f470a390 390 return;
8f7a84dd
DG
391 }
392
84ea9c99 393 DBG("Tearing down UST session(s)");
8f7a84dd 394
84cd17c6
MD
395 ret = ust_app_destroy_trace_all(session->ust_session);
396 if (ret) {
397 ERR("Error in ust_app_destroy_trace_all");
398 }
8f7a84dd 399
f6a9efaa
DG
400 trace_ust_destroy_session(session->ust_session);
401}
402
099e26bd
DG
403/*
404 * Stop all threads by closing the thread quit pipe.
405 */
cf3af59e
MD
406static void stop_threads(void)
407{
5eb91c98
DG
408 int ret;
409
cf3af59e
MD
410 /* Stopping all threads */
411 DBG("Terminating all threads");
54d01ffb 412 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
413 if (ret < 0) {
414 ERR("write error on thread quit pipe");
415 }
416
099e26bd
DG
417 /* Dispatch thread */
418 dispatch_thread_exit = 1;
419 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
420}
421
fac6795d 422/*
d063d709 423 * Cleanup the daemon
fac6795d 424 */
cf3af59e 425static void cleanup(void)
fac6795d 426{
76d7553f 427 int ret, i;
1d4b027a 428 char *cmd;
af9737e9 429 struct ltt_session *sess, *stmp;
fac6795d 430
1d4b027a 431 DBG("Cleaning up");
e07ae692 432
67e40797
DG
433 DBG("Removing %s directory", rundir);
434 ret = asprintf(&cmd, "rm -rf %s", rundir);
435 if (ret < 0) {
436 ERR("asprintf failed. Something is really wrong!");
437 }
5461b305 438
67e40797
DG
439 /* Remove lttng run directory */
440 ret = system(cmd);
441 if (ret < 0) {
442 ERR("Unable to clean %s", rundir);
1d4b027a 443 }
67e40797 444 free(cmd);
5461b305 445
99bab54f 446 DBG("Cleaning up all sessions");
fac6795d 447
b5541356 448 /* Destroy session list mutex */
273ea72c
DG
449 if (session_list_ptr != NULL) {
450 pthread_mutex_destroy(&session_list_ptr->lock);
451
452 /* Cleanup ALL session */
54d01ffb
DG
453 cds_list_for_each_entry_safe(sess, stmp,
454 &session_list_ptr->head, list) {
273ea72c 455 teardown_kernel_session(sess);
f6a9efaa
DG
456 teardown_ust_session(sess);
457 free(sess);
273ea72c
DG
458 }
459 }
460
099e26bd 461 DBG("Closing all UST sockets");
56fff090 462 ust_app_clean_list();
099e26bd 463
3bd1e081 464 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 465
4fba7219
DG
466 if (is_root && !opt_no_kernel) {
467 DBG2("Closing kernel fd");
a4b35e07 468 if (kernel_tracer_fd >= 0) {
76d7553f
MD
469 ret = close(kernel_tracer_fd);
470 if (ret) {
471 PERROR("close");
472 }
a4b35e07 473 }
2f50c8a3 474 DBG("Unloading kernel modules");
096102bd 475 modprobe_remove_lttng_all();
2f50c8a3 476 }
5eb91c98 477
76d7553f
MD
478 /*
479 * Closing all pipes used for communication between threads.
480 */
481 for (i = 0; i < 2; i++) {
482 if (kernel_poll_pipe[i] >= 0) {
483 ret = close(kernel_poll_pipe[i]);
484 if (ret) {
485 PERROR("close");
486 }
76d7553f
MD
487 }
488 }
489 for (i = 0; i < 2; i++) {
490 if (thread_quit_pipe[i] >= 0) {
491 ret = close(thread_quit_pipe[i]);
492 if (ret) {
493 PERROR("close");
494 }
495 }
496 }
497 for (i = 0; i < 2; i++) {
498 if (apps_cmd_pipe[i] >= 0) {
499 ret = close(apps_cmd_pipe[i]);
500 if (ret) {
501 PERROR("close");
502 }
503 }
504 }
421cb601
DG
505
506 /* <fun> */
f56a39af 507 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
508 "Matthew, BEET driven development works!%c[%dm",
509 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
510 /* </fun> */
fac6795d
DG
511}
512
e065084a 513/*
d063d709 514 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 515 *
d063d709 516 * Return lttcomm error code.
e065084a
DG
517 */
518static int send_unix_sock(int sock, void *buf, size_t len)
519{
520 /* Check valid length */
521 if (len <= 0) {
522 return -1;
523 }
524
525 return lttcomm_send_unix_sock(sock, buf, len);
526}
527
5461b305 528/*
d063d709 529 * Free memory of a command context structure.
5461b305 530 */
a2fb29a5 531static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 532{
a2fb29a5
DG
533 DBG("Clean command context structure");
534 if (*cmd_ctx) {
535 if ((*cmd_ctx)->llm) {
536 free((*cmd_ctx)->llm);
5461b305 537 }
a2fb29a5
DG
538 if ((*cmd_ctx)->lsm) {
539 free((*cmd_ctx)->lsm);
5461b305 540 }
a2fb29a5
DG
541 free(*cmd_ctx);
542 *cmd_ctx = NULL;
5461b305
DG
543 }
544}
545
f3ed775e 546/*
d063d709 547 * Send all stream fds of kernel channel to the consumer.
f3ed775e 548 */
2bdd86d4 549static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
550 int sock, struct ltt_kernel_channel *channel,
551 uid_t uid, gid_t gid)
f3ed775e
DG
552{
553 int ret;
f3ed775e 554 struct ltt_kernel_stream *stream;
3bd1e081 555 struct lttcomm_consumer_msg lkm;
f3ed775e 556
3bd1e081 557 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 558 channel->channel->name);
f3ed775e 559
3bd1e081
MD
560 /* Send channel */
561 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
562 lkm.u.channel.channel_key = channel->fd;
563 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
564 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 565 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 566 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 567 if (ret < 0) {
76d7553f 568 PERROR("send consumer channel");
f3ed775e
DG
569 goto error;
570 }
571
3bd1e081 572 /* Send streams */
7a485870 573 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
574 if (!stream->fd) {
575 continue;
576 }
577 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
578 lkm.u.stream.channel_key = channel->fd;
579 lkm.u.stream.stream_key = stream->fd;
580 lkm.u.stream.state = stream->state;
581 lkm.u.stream.output = channel->channel->attr.output;
582 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
583 lkm.u.stream.uid = uid;
584 lkm.u.stream.gid = gid;
3bd1e081
MD
585 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
586 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
587 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
588 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
589 if (ret < 0) {
76d7553f 590 PERROR("send consumer stream");
3bd1e081
MD
591 goto error;
592 }
593 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
594 if (ret < 0) {
76d7553f 595 PERROR("send consumer stream ancillary data");
3bd1e081 596 goto error;
f3ed775e
DG
597 }
598 }
599
3bd1e081 600 DBG("consumer channel streams sent");
f3ed775e
DG
601
602 return 0;
603
604error:
605 return ret;
606}
607
608/*
d063d709 609 * Send all stream fds of the kernel session to the consumer.
f3ed775e 610 */
2bdd86d4 611static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 612 struct ltt_kernel_session *session)
f3ed775e
DG
613{
614 int ret;
615 struct ltt_kernel_channel *chan;
3bd1e081
MD
616 struct lttcomm_consumer_msg lkm;
617 int sock = session->consumer_fd;
7a485870
DG
618
619 DBG("Sending metadata stream fd");
620
03550b58
MD
621 /* Extra protection. It's NOT supposed to be set to -1 at this point */
622 if (session->consumer_fd < 0) {
3bd1e081 623 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
624 }
625
03550b58 626 if (session->metadata_stream_fd >= 0) {
3bd1e081
MD
627 /* Send metadata channel fd */
628 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
629 lkm.u.channel.channel_key = session->metadata->fd;
630 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
631 lkm.u.channel.mmap_len = 0; /* for kernel */
032b44f0 632 DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081
MD
633 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
634 if (ret < 0) {
76d7553f 635 PERROR("send consumer channel");
3bd1e081
MD
636 goto error;
637 }
638
639 /* Send metadata stream fd */
640 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
641 lkm.u.stream.channel_key = session->metadata->fd;
642 lkm.u.stream.stream_key = session->metadata_stream_fd;
643 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
644 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
645 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
646 lkm.u.stream.uid = session->uid;
647 lkm.u.stream.gid = session->gid;
3bd1e081
MD
648 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
649 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
650 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
651 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
652 if (ret < 0) {
76d7553f 653 PERROR("send consumer stream");
3bd1e081
MD
654 goto error;
655 }
656 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 657 if (ret < 0) {
76d7553f 658 PERROR("send consumer stream");
7a485870
DG
659 goto error;
660 }
661 }
f3ed775e 662
f3ed775e 663 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
664 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
665 session->uid, session->gid);
2bdd86d4
MD
666 if (ret < 0) {
667 goto error;
668 }
669 }
670
671 DBG("consumer fds (metadata and channel streams) sent");
672
673 return 0;
674
675error:
676 return ret;
677}
678
fac6795d 679/*
0fdd1e2c 680 * Notify UST applications using the shm mmap futex.
fac6795d 681 */
0fdd1e2c 682static int notify_ust_apps(int active)
fac6795d 683{
0fdd1e2c 684 char *wait_shm_mmap;
fac6795d 685
0fdd1e2c 686 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 687
0fdd1e2c
DG
688 /* See shm.c for this call implying mmap, shm and futex calls */
689 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
690 if (wait_shm_mmap == NULL) {
fac6795d
DG
691 goto error;
692 }
693
0fdd1e2c
DG
694 /* Wake waiting process */
695 futex_wait_update((int32_t *) wait_shm_mmap, active);
696
697 /* Apps notified successfully */
698 return 0;
fac6795d
DG
699
700error:
0fdd1e2c 701 return -1;
fac6795d
DG
702}
703
e065084a 704/*
d063d709
DG
705 * Setup the outgoing data buffer for the response (llm) by allocating the
706 * right amount of memory and copying the original information from the lsm
707 * structure.
ca95a216 708 *
d063d709 709 * Return total size of the buffer pointed by buf.
ca95a216 710 */
5461b305 711static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 712{
f3ed775e 713 int ret, buf_size;
ca95a216 714
f3ed775e 715 buf_size = size;
5461b305 716
ba7f0ae5 717 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 718 if (cmd_ctx->llm == NULL) {
76d7553f 719 PERROR("zmalloc");
5461b305 720 ret = -ENOMEM;
ca95a216
DG
721 goto error;
722 }
723
5461b305
DG
724 /* Copy common data */
725 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 726 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 727
5461b305
DG
728 cmd_ctx->llm->data_size = size;
729 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
730
ca95a216
DG
731 return buf_size;
732
733error:
734 return ret;
735}
736
7a485870 737/*
5eb91c98 738 * Update the kernel poll set of all channel fd available over all tracing
d063d709 739 * session. Add the wakeup pipe at the end of the set.
7a485870 740 */
5eb91c98 741static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 742{
5eb91c98 743 int ret;
7a485870
DG
744 struct ltt_session *session;
745 struct ltt_kernel_channel *channel;
746
5eb91c98 747 DBG("Updating kernel poll set");
7a485870 748
54d01ffb 749 session_lock_list();
b5541356 750 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 751 session_lock(session);
7a485870 752 if (session->kernel_session == NULL) {
54d01ffb 753 session_unlock(session);
7a485870
DG
754 continue;
755 }
7a485870 756
54d01ffb
DG
757 cds_list_for_each_entry(channel,
758 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
759 /* Add channel fd to the kernel poll set */
760 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
761 if (ret < 0) {
54d01ffb 762 session_unlock(session);
5eb91c98
DG
763 goto error;
764 }
765 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 766 }
54d01ffb 767 session_unlock(session);
7a485870 768 }
54d01ffb 769 session_unlock_list();
7a485870 770
5eb91c98 771 return 0;
7a485870
DG
772
773error:
54d01ffb 774 session_unlock_list();
7a485870
DG
775 return -1;
776}
777
778/*
54d01ffb 779 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 780 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 781 *
d063d709 782 * Useful for CPU hotplug feature.
7a485870 783 */
2bdd86d4 784static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
785{
786 int ret = 0;
787 struct ltt_session *session;
788 struct ltt_kernel_channel *channel;
789
790 DBG("Updating kernel streams for channel fd %d", fd);
791
54d01ffb 792 session_lock_list();
b5541356 793 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 794 session_lock(session);
7a485870 795 if (session->kernel_session == NULL) {
54d01ffb 796 session_unlock(session);
7a485870
DG
797 continue;
798 }
d9800920 799
03550b58
MD
800 /* This is not suppose to be -1 but this is an extra security check */
801 if (session->kernel_session->consumer_fd < 0) {
3bd1e081 802 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
803 }
804
5eb91c98
DG
805 cds_list_for_each_entry(channel,
806 &session->kernel_session->channel_list.head, list) {
7a485870
DG
807 if (channel->fd == fd) {
808 DBG("Channel found, updating kernel streams");
809 ret = kernel_open_channel_stream(channel);
810 if (ret < 0) {
b3c750d2 811 goto error;
7a485870 812 }
d9800920 813
7a485870 814 /*
5eb91c98
DG
815 * Have we already sent fds to the consumer? If yes, it means
816 * that tracing is started so it is safe to send our updated
817 * stream fds.
7a485870 818 */
3bd1e081 819 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 820 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
821 session->kernel_session->consumer_fd, channel,
822 session->uid, session->gid);
7a485870 823 if (ret < 0) {
b3c750d2 824 goto error;
7a485870
DG
825 }
826 }
b3c750d2 827 goto error;
7a485870
DG
828 }
829 }
54d01ffb 830 session_unlock(session);
7a485870 831 }
54d01ffb 832 session_unlock_list();
b3c750d2 833 return ret;
7a485870 834
b3c750d2 835error:
54d01ffb
DG
836 session_unlock(session);
837 session_unlock_list();
7a485870
DG
838 return ret;
839}
840
487cf67c
DG
841/*
842 * For each tracing session, update newly registered apps.
843 */
844static void update_ust_app(int app_sock)
845{
846 struct ltt_session *sess, *stmp;
847
4ee14516
DG
848 session_lock_list();
849
487cf67c
DG
850 /* For all tracing session(s) */
851 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 852 session_lock(sess);
421cb601
DG
853 if (sess->ust_session) {
854 ust_app_global_update(sess->ust_session, app_sock);
855 }
4ee14516 856 session_unlock(sess);
487cf67c 857 }
4ee14516
DG
858
859 session_unlock_list();
487cf67c
DG
860}
861
7a485870 862/*
d063d709 863 * This thread manage event coming from the kernel.
7a485870 864 *
d063d709
DG
865 * Features supported in this thread:
866 * -) CPU Hotplug
7a485870
DG
867 */
868static void *thread_manage_kernel(void *data)
869{
5eb91c98
DG
870 int ret, i, pollfd, update_poll_flag = 1;
871 uint32_t revents, nb_fd;
7a485870 872 char tmp;
5eb91c98 873 struct lttng_poll_event events;
7a485870
DG
874
875 DBG("Thread manage kernel started");
876
5eb91c98
DG
877 ret = create_thread_poll_set(&events, 2);
878 if (ret < 0) {
76d7553f 879 goto error_poll_create;
5eb91c98
DG
880 }
881
882 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
883 if (ret < 0) {
884 goto error;
885 }
886
7a485870
DG
887 while (1) {
888 if (update_poll_flag == 1) {
5f822d0a
DG
889 /*
890 * Reset number of fd in the poll set. Always 2 since there is the thread
891 * quit pipe and the kernel pipe.
892 */
893 events.nb_fd = 2;
894
5eb91c98
DG
895 ret = update_kernel_poll(&events);
896 if (ret < 0) {
7a485870
DG
897 goto error;
898 }
899 update_poll_flag = 0;
900 }
901
5eb91c98
DG
902 nb_fd = LTTNG_POLL_GETNB(&events);
903
904 DBG("Thread kernel polling on %d fds", nb_fd);
905
906 /* Zeroed the poll events */
907 lttng_poll_reset(&events);
7a485870
DG
908
909 /* Poll infinite value of time */
88f2b785 910 restart:
5eb91c98 911 ret = lttng_poll_wait(&events, -1);
7a485870 912 if (ret < 0) {
88f2b785
MD
913 /*
914 * Restart interrupted system call.
915 */
916 if (errno == EINTR) {
917 goto restart;
918 }
7a485870
DG
919 goto error;
920 } else if (ret == 0) {
921 /* Should not happen since timeout is infinite */
85611738
DG
922 ERR("Return value of poll is 0 with an infinite timeout.\n"
923 "This should not have happened! Continuing...");
7a485870
DG
924 continue;
925 }
926
5eb91c98
DG
927 for (i = 0; i < nb_fd; i++) {
928 /* Fetch once the poll data */
929 revents = LTTNG_POLL_GETEV(&events, i);
930 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 931
5eb91c98
DG
932 /* Thread quit pipe has been closed. Killing thread. */
933 ret = check_thread_quit_pipe(pollfd, revents);
934 if (ret) {
935 goto error;
936 }
7a485870 937
5eb91c98
DG
938 /* Check for data on kernel pipe */
939 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
940 ret = read(kernel_poll_pipe[0], &tmp, 1);
941 update_poll_flag = 1;
942 continue;
943 } else {
944 /*
945 * New CPU detected by the kernel. Adding kernel stream to
946 * kernel session and updating the kernel consumer
947 */
948 if (revents & LPOLLIN) {
2bdd86d4 949 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
950 if (ret < 0) {
951 continue;
952 }
953 break;
954 /*
955 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
956 * and unregister kernel stream at this point.
957 */
7a485870 958 }
7a485870
DG
959 }
960 }
961 }
962
963error:
5eb91c98 964 lttng_poll_clean(&events);
76d7553f
MD
965error_poll_create:
966 DBG("Kernel thread dying");
7a485870
DG
967 return NULL;
968}
969
1d4b027a 970/*
3bd1e081 971 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 972 */
3bd1e081 973static void *thread_manage_consumer(void *data)
1d4b027a 974{
76d7553f 975 int sock = -1, i, ret, pollfd;
5eb91c98 976 uint32_t revents, nb_fd;
1d4b027a 977 enum lttcomm_return_code code;
5eb91c98 978 struct lttng_poll_event events;
3bd1e081 979 struct consumer_data *consumer_data = data;
1d4b027a 980
3bd1e081 981 DBG("[thread] Manage consumer started");
1d4b027a 982
3bd1e081 983 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a 984 if (ret < 0) {
76d7553f 985 goto error_listen;
1d4b027a
DG
986 }
987
5eb91c98
DG
988 /*
989 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
990 * Nothing more will be added to this poll set.
991 */
992 ret = create_thread_poll_set(&events, 2);
993 if (ret < 0) {
76d7553f 994 goto error_poll;
5eb91c98 995 }
273ea72c 996
3bd1e081 997 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
998 if (ret < 0) {
999 goto error;
1000 }
1001
1002 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
1003
1004 /* Inifinite blocking call, waiting for transmission */
88f2b785 1005restart:
5eb91c98 1006 ret = lttng_poll_wait(&events, -1);
273ea72c 1007 if (ret < 0) {
88f2b785
MD
1008 /*
1009 * Restart interrupted system call.
1010 */
1011 if (errno == EINTR) {
1012 goto restart;
1013 }
273ea72c
DG
1014 goto error;
1015 }
1016
5eb91c98
DG
1017 for (i = 0; i < nb_fd; i++) {
1018 /* Fetch once the poll data */
1019 revents = LTTNG_POLL_GETEV(&events, i);
1020 pollfd = LTTNG_POLL_GETFD(&events, i);
1021
1022 /* Thread quit pipe has been closed. Killing thread. */
1023 ret = check_thread_quit_pipe(pollfd, revents);
1024 if (ret) {
1025 goto error;
1026 }
1027
1028 /* Event on the registration socket */
3bd1e081 1029 if (pollfd == consumer_data->err_sock) {
5eb91c98 1030 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1031 ERR("consumer err socket poll error");
5eb91c98
DG
1032 goto error;
1033 }
1034 }
273ea72c
DG
1035 }
1036
3bd1e081 1037 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
1038 if (sock < 0) {
1039 goto error;
1040 }
1041
3bd1e081 1042 DBG2("Receiving code from consumer err_sock");
ee0b0061 1043
712ea556 1044 /* Getting status code from kconsumerd */
54d01ffb
DG
1045 ret = lttcomm_recv_unix_sock(sock, &code,
1046 sizeof(enum lttcomm_return_code));
1d4b027a
DG
1047 if (ret <= 0) {
1048 goto error;
1049 }
1050
3bd1e081
MD
1051 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1052 consumer_data->cmd_sock =
1053 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1054 if (consumer_data->cmd_sock < 0) {
1055 sem_post(&consumer_data->sem);
48842b30 1056 PERROR("consumer connect");
1d4b027a
DG
1057 goto error;
1058 }
1059 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1060 sem_post(&consumer_data->sem);
1061 DBG("consumer command socket ready");
1d4b027a 1062 } else {
3bd1e081 1063 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1064 lttcomm_get_readable_code(-code));
1065 goto error;
1066 }
1067
54d01ffb 1068 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1069 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1070 if (ret < 0) {
72079cae
DG
1071 goto error;
1072 }
1073
5eb91c98
DG
1074 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1075 if (ret < 0) {
72079cae 1076 goto error;
5eb91c98
DG
1077 }
1078
1079 /* Update number of fd */
1080 nb_fd = LTTNG_POLL_GETNB(&events);
1081
1082 /* Inifinite blocking call, waiting for transmission */
88f2b785 1083restart_poll:
5eb91c98
DG
1084 ret = lttng_poll_wait(&events, -1);
1085 if (ret < 0) {
88f2b785
MD
1086 /*
1087 * Restart interrupted system call.
1088 */
1089 if (errno == EINTR) {
1090 goto restart_poll;
1091 }
72079cae
DG
1092 goto error;
1093 }
1094
5eb91c98
DG
1095 for (i = 0; i < nb_fd; i++) {
1096 /* Fetch once the poll data */
1097 revents = LTTNG_POLL_GETEV(&events, i);
1098 pollfd = LTTNG_POLL_GETFD(&events, i);
1099
1100 /* Thread quit pipe has been closed. Killing thread. */
1101 ret = check_thread_quit_pipe(pollfd, revents);
1102 if (ret) {
1103 goto error;
1104 }
1105
1106 /* Event on the kconsumerd socket */
1107 if (pollfd == sock) {
1108 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1109 ERR("consumer err socket second poll error");
5eb91c98
DG
1110 goto error;
1111 }
1112 }
1113 }
1114
712ea556 1115 /* Wait for any kconsumerd error */
54d01ffb
DG
1116 ret = lttcomm_recv_unix_sock(sock, &code,
1117 sizeof(enum lttcomm_return_code));
712ea556 1118 if (ret <= 0) {
3bd1e081 1119 ERR("consumer closed the command socket");
712ea556 1120 goto error;
6f61d021 1121 }
1d4b027a 1122
3bd1e081 1123 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1124
1d4b027a 1125error:
5c827ce0
DG
1126 /* Immediately set the consumerd state to stopped */
1127 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1128 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1129 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1130 consumer_data->type == LTTNG_CONSUMER32_UST) {
1131 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1132 } else {
1133 /* Code flow error... */
1134 assert(0);
1135 }
1136
76d7553f
MD
1137 if (consumer_data->err_sock >= 0) {
1138 ret = close(consumer_data->err_sock);
1139 if (ret) {
1140 PERROR("close");
1141 }
1142 }
1143 if (consumer_data->cmd_sock >= 0) {
1144 ret = close(consumer_data->cmd_sock);
1145 if (ret) {
1146 PERROR("close");
1147 }
1148 }
1149 if (sock >= 0) {
1150 ret = close(sock);
1151 if (ret) {
1152 PERROR("close");
1153 }
1154 }
273ea72c 1155
3bd1e081
MD
1156 unlink(consumer_data->err_unix_sock_path);
1157 unlink(consumer_data->cmd_unix_sock_path);
1158 consumer_data->pid = 0;
1d4b027a 1159
5eb91c98 1160 lttng_poll_clean(&events);
76d7553f
MD
1161error_poll:
1162error_listen:
1163 DBG("consumer thread cleanup completed");
0177d773 1164
5eb91c98 1165 return NULL;
099e26bd
DG
1166}
1167
099e26bd
DG
1168/*
1169 * This thread manage application communication.
1d4b027a
DG
1170 */
1171static void *thread_manage_apps(void *data)
099e26bd 1172{
5eb91c98
DG
1173 int i, ret, pollfd;
1174 uint32_t revents, nb_fd;
099e26bd 1175 struct ust_command ust_cmd;
5eb91c98 1176 struct lttng_poll_event events;
099e26bd
DG
1177
1178 DBG("[thread] Manage application started");
1179
f6a9efaa
DG
1180 rcu_register_thread();
1181 rcu_thread_online();
1182
5eb91c98
DG
1183 ret = create_thread_poll_set(&events, 2);
1184 if (ret < 0) {
76d7553f 1185 goto error_poll_create;
5eb91c98 1186 }
099e26bd 1187
5eb91c98
DG
1188 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1189 if (ret < 0) {
1190 goto error;
1191 }
099e26bd 1192
5eb91c98
DG
1193 while (1) {
1194 /* Zeroed the events structure */
1195 lttng_poll_reset(&events);
0177d773 1196
5eb91c98 1197 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1198
1199 DBG("Apps thread polling on %d fds", nb_fd);
1200
1201 /* Inifinite blocking call, waiting for transmission */
88f2b785 1202 restart:
5eb91c98 1203 ret = lttng_poll_wait(&events, -1);
099e26bd 1204 if (ret < 0) {
88f2b785
MD
1205 /*
1206 * Restart interrupted system call.
1207 */
1208 if (errno == EINTR) {
1209 goto restart;
1210 }
099e26bd
DG
1211 goto error;
1212 }
1213
5eb91c98
DG
1214 for (i = 0; i < nb_fd; i++) {
1215 /* Fetch once the poll data */
1216 revents = LTTNG_POLL_GETEV(&events, i);
1217 pollfd = LTTNG_POLL_GETFD(&events, i);
1218
1219 /* Thread quit pipe has been closed. Killing thread. */
1220 ret = check_thread_quit_pipe(pollfd, revents);
1221 if (ret) {
099e26bd 1222 goto error;
5eb91c98 1223 }
099e26bd 1224
5eb91c98
DG
1225 /* Inspect the apps cmd pipe */
1226 if (pollfd == apps_cmd_pipe[0]) {
1227 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1228 ERR("Apps command pipe error");
0177d773 1229 goto error;
5eb91c98
DG
1230 } else if (revents & LPOLLIN) {
1231 /* Empty pipe */
1232 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1233 if (ret < 0 || ret < sizeof(ust_cmd)) {
76d7553f 1234 PERROR("read apps cmd pipe");
5eb91c98
DG
1235 goto error;
1236 }
099e26bd 1237
5eb91c98 1238 /* Register applicaton to the session daemon */
56fff090 1239 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1240 ust_cmd.sock);
88ff5b7f 1241 if (ret == -ENOMEM) {
5eb91c98 1242 goto error;
88ff5b7f
MD
1243 } else if (ret < 0) {
1244 break;
5eb91c98
DG
1245 }
1246
acc7b41b 1247 /*
e0c7ec2b 1248 * Validate UST version compatibility.
acc7b41b 1249 */
e0c7ec2b
DG
1250 ret = ust_app_validate_version(ust_cmd.sock);
1251 if (ret >= 0) {
1252 /*
1253 * Add channel(s) and event(s) to newly registered apps
1254 * from lttng global UST domain.
1255 */
1256 update_ust_app(ust_cmd.sock);
1257 }
acc7b41b 1258
f2ca2e25 1259 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1260 if (ret < 0) {
1261 /*
1262 * If the registration is not possible, we simply
1263 * unregister the apps and continue
1264 */
56fff090 1265 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1266 } else {
1267 /*
1268 * We just need here to monitor the close of the UST
1269 * socket and poll set monitor those by default.
a9ade966
MD
1270 * Listen on POLLIN (even if we never expect any
1271 * data) to ensure that hangup wakes us.
5eb91c98 1272 */
a9ade966 1273 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1274 if (ret < 0) {
1275 goto error;
1276 }
1277
54d01ffb
DG
1278 DBG("Apps with sock %d added to poll set",
1279 ust_cmd.sock);
5eb91c98 1280 }
487cf67c 1281
5eb91c98 1282 break;
0177d773 1283 }
5eb91c98
DG
1284 } else {
1285 /*
54d01ffb
DG
1286 * At this point, we know that a registered application made
1287 * the event at poll_wait.
5eb91c98
DG
1288 */
1289 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1290 /* Removing from the poll set */
1291 ret = lttng_poll_del(&events, pollfd);
1292 if (ret < 0) {
1293 goto error;
1294 }
099e26bd 1295
b9d9b220 1296 /* Socket closed on remote end. */
56fff090 1297 ust_app_unregister(pollfd);
5eb91c98
DG
1298 break;
1299 }
099e26bd
DG
1300 }
1301 }
099e26bd
DG
1302 }
1303
1304error:
5eb91c98 1305 lttng_poll_clean(&events);
76d7553f
MD
1306error_poll_create:
1307 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1308 rcu_thread_offline();
1309 rcu_unregister_thread();
099e26bd
DG
1310 return NULL;
1311}
1312
1313/*
1314 * Dispatch request from the registration threads to the application
1315 * communication thread.
1316 */
1317static void *thread_dispatch_ust_registration(void *data)
1318{
1319 int ret;
1320 struct cds_wfq_node *node;
1321 struct ust_command *ust_cmd = NULL;
1322
1323 DBG("[thread] Dispatch UST command started");
1324
1325 while (!dispatch_thread_exit) {
1326 /* Atomically prepare the queue futex */
1327 futex_nto1_prepare(&ust_cmd_queue.futex);
1328
1329 do {
1330 /* Dequeue command for registration */
1331 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1332 if (node == NULL) {
00a17c97 1333 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1334 /* Continue thread execution */
1335 break;
1336 }
1337
1338 ust_cmd = caa_container_of(node, struct ust_command, node);
1339
2f50c8a3
DG
1340 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1341 " gid:%d sock:%d name:%s (version %d.%d)",
1342 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1343 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1344 ust_cmd->sock, ust_cmd->reg_msg.name,
1345 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1346 /*
1347 * Inform apps thread of the new application registration. This
1348 * call is blocking so we can be assured that the data will be read
1349 * at some point in time or wait to the end of the world :)
1350 */
1351 ret = write(apps_cmd_pipe[1], ust_cmd,
1352 sizeof(struct ust_command));
1353 if (ret < 0) {
76d7553f 1354 PERROR("write apps cmd pipe");
099e26bd
DG
1355 if (errno == EBADF) {
1356 /*
1357 * We can't inform the application thread to process
1358 * registration. We will exit or else application
1359 * registration will not occur and tracing will never
1360 * start.
1361 */
1362 goto error;
1363 }
1364 }
1365 free(ust_cmd);
1366 } while (node != NULL);
1367
1368 /* Futex wait on queue. Blocking call on futex() */
1369 futex_nto1_wait(&ust_cmd_queue.futex);
1370 }
1371
1372error:
1373 DBG("Dispatch thread dying");
1374 return NULL;
1375}
1376
1377/*
1378 * This thread manage application registration.
1379 */
1380static void *thread_registration_apps(void *data)
1d4b027a 1381{
a4b35e07 1382 int sock = -1, i, ret, pollfd;
5eb91c98
DG
1383 uint32_t revents, nb_fd;
1384 struct lttng_poll_event events;
099e26bd
DG
1385 /*
1386 * Get allocated in this thread, enqueued to a global queue, dequeued and
1387 * freed in the manage apps thread.
1388 */
1389 struct ust_command *ust_cmd = NULL;
1d4b027a 1390
099e26bd 1391 DBG("[thread] Manage application registration started");
1d4b027a
DG
1392
1393 ret = lttcomm_listen_unix_sock(apps_sock);
1394 if (ret < 0) {
76d7553f 1395 goto error_listen;
1d4b027a
DG
1396 }
1397
5eb91c98
DG
1398 /*
1399 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1400 * more will be added to this poll set.
1401 */
1402 ret = create_thread_poll_set(&events, 2);
1403 if (ret < 0) {
76d7553f 1404 goto error_create_poll;
5eb91c98 1405 }
273ea72c 1406
5eb91c98
DG
1407 /* Add the application registration socket */
1408 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1409 if (ret < 0) {
76d7553f 1410 goto error_poll_add;
5eb91c98 1411 }
273ea72c 1412
1d4b027a 1413 /* Notify all applications to register */
0fdd1e2c
DG
1414 ret = notify_ust_apps(1);
1415 if (ret < 0) {
1416 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1417 "Execution continues but there might be problem for already\n"
1418 "running applications that wishes to register.");
0fdd1e2c 1419 }
1d4b027a
DG
1420
1421 while (1) {
1422 DBG("Accepting application registration");
273ea72c 1423
5eb91c98
DG
1424 nb_fd = LTTNG_POLL_GETNB(&events);
1425
273ea72c 1426 /* Inifinite blocking call, waiting for transmission */
88f2b785 1427 restart:
5eb91c98 1428 ret = lttng_poll_wait(&events, -1);
273ea72c 1429 if (ret < 0) {
88f2b785
MD
1430 /*
1431 * Restart interrupted system call.
1432 */
1433 if (errno == EINTR) {
1434 goto restart;
1435 }
273ea72c
DG
1436 goto error;
1437 }
1438
5eb91c98
DG
1439 for (i = 0; i < nb_fd; i++) {
1440 /* Fetch once the poll data */
1441 revents = LTTNG_POLL_GETEV(&events, i);
1442 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1443
5eb91c98
DG
1444 /* Thread quit pipe has been closed. Killing thread. */
1445 ret = check_thread_quit_pipe(pollfd, revents);
1446 if (ret) {
90014c57
DG
1447 goto error;
1448 }
1d4b027a 1449
5eb91c98
DG
1450 /* Event on the registration socket */
1451 if (pollfd == apps_sock) {
1452 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1453 ERR("Register apps socket poll error");
1454 goto error;
1455 } else if (revents & LPOLLIN) {
1456 sock = lttcomm_accept_unix_sock(apps_sock);
1457 if (sock < 0) {
1458 goto error;
1459 }
099e26bd 1460
5eb91c98 1461 /* Create UST registration command for enqueuing */
ba7f0ae5 1462 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1463 if (ust_cmd == NULL) {
76d7553f 1464 PERROR("ust command zmalloc");
5eb91c98
DG
1465 goto error;
1466 }
1d4b027a 1467
5eb91c98
DG
1468 /*
1469 * Using message-based transmissions to ensure we don't
1470 * have to deal with partially received messages.
1471 */
4063050c
MD
1472 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1473 if (ret < 0) {
1474 ERR("Exhausted file descriptors allowed for applications.");
1475 free(ust_cmd);
1476 ret = close(sock);
1477 if (ret) {
1478 PERROR("close");
1479 }
1480 sock = -1;
1481 continue;
1482 }
5eb91c98
DG
1483 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1484 sizeof(struct ust_register_msg));
1485 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1486 if (ret < 0) {
76d7553f 1487 PERROR("lttcomm_recv_unix_sock register apps");
5eb91c98
DG
1488 } else {
1489 ERR("Wrong size received on apps register");
1490 }
1491 free(ust_cmd);
76d7553f
MD
1492 ret = close(sock);
1493 if (ret) {
1494 PERROR("close");
1495 }
4063050c 1496 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1497 sock = -1;
5eb91c98
DG
1498 continue;
1499 }
099e26bd 1500
5eb91c98 1501 ust_cmd->sock = sock;
34a2494f 1502 sock = -1;
099e26bd 1503
5eb91c98
DG
1504 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1505 " gid:%d sock:%d name:%s (version %d.%d)",
1506 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1507 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1508 ust_cmd->sock, ust_cmd->reg_msg.name,
1509 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1510
5eb91c98
DG
1511 /*
1512 * Lock free enqueue the registration request. The red pill
54d01ffb 1513 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1514 */
1515 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1516
1517 /*
1518 * Wake the registration queue futex. Implicit memory
1519 * barrier with the exchange in cds_wfq_enqueue.
1520 */
1521 futex_nto1_wake(&ust_cmd_queue.futex);
1522 }
1523 }
90014c57 1524 }
1d4b027a
DG
1525 }
1526
1527error:
0fdd1e2c
DG
1528 /* Notify that the registration thread is gone */
1529 notify_ust_apps(0);
1530
a4b35e07 1531 if (apps_sock >= 0) {
76d7553f
MD
1532 ret = close(apps_sock);
1533 if (ret) {
1534 PERROR("close");
1535 }
a4b35e07 1536 }
46c3f085 1537 if (sock >= 0) {
76d7553f
MD
1538 ret = close(sock);
1539 if (ret) {
1540 PERROR("close");
1541 }
4063050c 1542 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1543 }
273ea72c 1544 unlink(apps_unix_sock_path);
0fdd1e2c 1545
76d7553f 1546error_poll_add:
5eb91c98 1547 lttng_poll_clean(&events);
76d7553f
MD
1548error_listen:
1549error_create_poll:
1550 DBG("UST Registration thread cleanup complete");
5eb91c98 1551
1d4b027a
DG
1552 return NULL;
1553}
1554
8c0faa1d 1555/*
3bd1e081 1556 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1557 * exec or it will fails.
8c0faa1d 1558 */
3bd1e081 1559static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1560{
1561 int ret;
ee0b0061
DG
1562 struct timespec timeout;
1563
1564 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1565 timeout.tv_nsec = 0;
8c0faa1d
DG
1566
1567 /* Setup semaphore */
3bd1e081 1568 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1569 if (ret < 0) {
3bd1e081 1570 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1571 goto error;
1572 }
8c0faa1d 1573
3bd1e081
MD
1574 ret = pthread_create(&consumer_data->thread, NULL,
1575 thread_manage_consumer, consumer_data);
8c0faa1d 1576 if (ret != 0) {
3bd1e081 1577 PERROR("pthread_create consumer");
ee0b0061 1578 ret = -1;
8c0faa1d
DG
1579 goto error;
1580 }
1581
ee0b0061
DG
1582 /* Get time for sem_timedwait absolute timeout */
1583 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1584 if (ret < 0) {
3bd1e081 1585 PERROR("clock_gettime spawn consumer");
ee0b0061 1586 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1587 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1588 } else {
1589 /* Normal timeout if the gettime was successful */
1590 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1591 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1592 }
8c0faa1d 1593
ee0b0061
DG
1594 if (ret < 0) {
1595 if (errno == ETIMEDOUT) {
1596 /*
1597 * Call has timed out so we kill the kconsumerd_thread and return
1598 * an error.
1599 */
3bd1e081
MD
1600 ERR("The consumer thread was never ready. Killing it");
1601 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1602 if (ret < 0) {
3bd1e081 1603 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1604 }
1605 } else {
3bd1e081 1606 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1607 }
1608 goto error;
1609 }
1610
3bd1e081
MD
1611 pthread_mutex_lock(&consumer_data->pid_mutex);
1612 if (consumer_data->pid == 0) {
712ea556 1613 ERR("Kconsumerd did not start");
3bd1e081 1614 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1615 goto error;
1616 }
3bd1e081 1617 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1618
8c0faa1d
DG
1619 return 0;
1620
1621error:
1622 return ret;
1623}
1624
d9800920 1625/*
3bd1e081 1626 * Join consumer thread
d9800920 1627 */
3bd1e081 1628static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1629{
1630 void *status;
1631 int ret;
1632
3bd1e081
MD
1633 if (consumer_data->pid != 0) {
1634 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1635 if (ret) {
3bd1e081 1636 ERR("Error killing consumer daemon");
cf3af59e
MD
1637 return ret;
1638 }
3bd1e081 1639 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1640 } else {
1641 return 0;
1642 }
1643}
1644
8c0faa1d 1645/*
3bd1e081 1646 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1647 *
d063d709 1648 * Return pid if successful else -1.
8c0faa1d 1649 */
3bd1e081 1650static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1651{
1652 int ret;
1653 pid_t pid;
94c55f17 1654 const char *consumer_to_use;
53086306 1655 const char *verbosity;
94c55f17 1656 struct stat st;
8c0faa1d 1657
3bd1e081 1658 DBG("Spawning consumerd");
c49dc785 1659
8c0faa1d
DG
1660 pid = fork();
1661 if (pid == 0) {
1662 /*
3bd1e081 1663 * Exec consumerd.
8c0faa1d 1664 */
daee5345 1665 if (opt_verbose_consumer) {
53086306
DG
1666 verbosity = "--verbose";
1667 } else {
1668 verbosity = "--quiet";
1669 }
3bd1e081
MD
1670 switch (consumer_data->type) {
1671 case LTTNG_CONSUMER_KERNEL:
94c55f17 1672 /*
c7704d57
DG
1673 * Find out which consumerd to execute. We will first try the
1674 * 64-bit path, then the sessiond's installation directory, and
1675 * fallback on the 32-bit one,
94c55f17 1676 */
63a799e8
AM
1677 DBG3("Looking for a kernel consumer at these locations:");
1678 DBG3(" 1) %s", consumerd64_bin);
1679 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1680 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1681 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1682 DBG3("Found location #1");
94c55f17 1683 consumer_to_use = consumerd64_bin;
94c55f17 1684 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1685 DBG3("Found location #2");
94c55f17 1686 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1687 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1688 DBG3("Found location #3");
eb1e0bd4 1689 consumer_to_use = consumerd32_bin;
94c55f17 1690 } else {
63a799e8 1691 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1692 break;
1693 }
1694 DBG("Using kernel consumer at: %s", consumer_to_use);
1695 execl(consumer_to_use,
1696 "lttng-consumerd", verbosity, "-k",
1697 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1698 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1699 NULL);
3bd1e081 1700 break;
7753dea8
MD
1701 case LTTNG_CONSUMER64_UST:
1702 {
b1e0b6b6 1703 char *tmpnew = NULL;
8f4905da
MD
1704
1705 if (consumerd64_libdir[0] != '\0') {
1706 char *tmp;
1707 size_t tmplen;
1708
1709 tmp = getenv("LD_LIBRARY_PATH");
1710 if (!tmp) {
1711 tmp = "";
1712 }
1713 tmplen = strlen("LD_LIBRARY_PATH=")
1714 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1715 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1716 if (!tmpnew) {
1717 ret = -ENOMEM;
1718 goto error;
1719 }
1720 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1721 strcat(tmpnew, consumerd64_libdir);
1722 if (tmp[0] != '\0') {
1723 strcat(tmpnew, ":");
1724 strcat(tmpnew, tmp);
1725 }
1726 ret = putenv(tmpnew);
1727 if (ret) {
1728 ret = -errno;
1729 goto error;
1730 }
1731 }
94c55f17 1732 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1733 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1734 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1735 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1736 NULL);
8f4905da
MD
1737 if (consumerd64_libdir[0] != '\0') {
1738 free(tmpnew);
1739 }
1740 if (ret) {
1741 goto error;
1742 }
3bd1e081 1743 break;
7753dea8
MD
1744 }
1745 case LTTNG_CONSUMER32_UST:
1746 {
937dde8e 1747 char *tmpnew = NULL;
8f4905da
MD
1748
1749 if (consumerd32_libdir[0] != '\0') {
1750 char *tmp;
1751 size_t tmplen;
1752
1753 tmp = getenv("LD_LIBRARY_PATH");
1754 if (!tmp) {
1755 tmp = "";
1756 }
1757 tmplen = strlen("LD_LIBRARY_PATH=")
1758 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1759 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1760 if (!tmpnew) {
1761 ret = -ENOMEM;
1762 goto error;
1763 }
1764 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1765 strcat(tmpnew, consumerd32_libdir);
1766 if (tmp[0] != '\0') {
1767 strcat(tmpnew, ":");
1768 strcat(tmpnew, tmp);
1769 }
1770 ret = putenv(tmpnew);
1771 if (ret) {
1772 ret = -errno;
1773 goto error;
1774 }
1775 }
94c55f17 1776 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1777 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1778 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1779 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1780 NULL);
8f4905da
MD
1781 if (consumerd32_libdir[0] != '\0') {
1782 free(tmpnew);
1783 }
1784 if (ret) {
1785 goto error;
1786 }
7753dea8
MD
1787 break;
1788 }
3bd1e081 1789 default:
76d7553f 1790 PERROR("unknown consumer type");
3bd1e081
MD
1791 exit(EXIT_FAILURE);
1792 }
8c0faa1d 1793 if (errno != 0) {
76d7553f 1794 PERROR("kernel start consumer exec");
8c0faa1d
DG
1795 }
1796 exit(EXIT_FAILURE);
1797 } else if (pid > 0) {
1798 ret = pid;
8c0faa1d 1799 } else {
76d7553f 1800 PERROR("start consumer fork");
8c0faa1d 1801 ret = -errno;
8c0faa1d 1802 }
8f4905da 1803error:
8c0faa1d
DG
1804 return ret;
1805}
1806
693bd40b 1807/*
3bd1e081 1808 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1809 */
3bd1e081 1810static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1811{
1812 int ret;
1813
3bd1e081
MD
1814 pthread_mutex_lock(&consumer_data->pid_mutex);
1815 if (consumer_data->pid != 0) {
1816 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1817 goto end;
1818 }
693bd40b 1819
3bd1e081 1820 ret = spawn_consumerd(consumer_data);
c49dc785 1821 if (ret < 0) {
3bd1e081
MD
1822 ERR("Spawning consumerd failed");
1823 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1824 goto error;
693bd40b 1825 }
c49dc785 1826
3bd1e081
MD
1827 /* Setting up the consumer_data pid */
1828 consumer_data->pid = ret;
48842b30 1829 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1830 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1831
3bd1e081
MD
1832 DBG2("Spawning consumer control thread");
1833 ret = spawn_consumer_thread(consumer_data);
693bd40b 1834 if (ret < 0) {
3bd1e081 1835 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1836 goto error;
1837 }
1838
c49dc785 1839end:
693bd40b
DG
1840 return 0;
1841
1842error:
1843 return ret;
1844}
1845
b73401da 1846/*
096102bd 1847 * Check version of the lttng-modules.
b73401da 1848 */
096102bd 1849static int validate_lttng_modules_version(void)
b73401da 1850{
096102bd 1851 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1852}
1853
b73401da 1854/*
096102bd 1855 * Setup necessary data for kernel tracer action.
b73401da 1856 */
096102bd 1857static int init_kernel_tracer(void)
b73401da
DG
1858{
1859 int ret;
b73401da 1860
096102bd
DG
1861 /* Modprobe lttng kernel modules */
1862 ret = modprobe_lttng_control();
b73401da 1863 if (ret < 0) {
b73401da
DG
1864 goto error;
1865 }
1866
096102bd
DG
1867 /* Open debugfs lttng */
1868 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1869 if (kernel_tracer_fd < 0) {
1870 DBG("Failed to open %s", module_proc_lttng);
1871 ret = -1;
1872 goto error_open;
b73401da
DG
1873 }
1874
096102bd
DG
1875 /* Validate kernel version */
1876 ret = validate_lttng_modules_version();
b73401da 1877 if (ret < 0) {
096102bd 1878 goto error_version;
b73401da
DG
1879 }
1880
096102bd 1881 ret = modprobe_lttng_data();
b73401da 1882 if (ret < 0) {
096102bd 1883 goto error_modules;
8c0faa1d
DG
1884 }
1885
f3ed775e 1886 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1887 return 0;
1888
1889error_version:
1890 modprobe_remove_lttng_control();
76d7553f
MD
1891 ret = close(kernel_tracer_fd);
1892 if (ret) {
1893 PERROR("close");
1894 }
1895 kernel_tracer_fd = -1;
096102bd
DG
1896 return LTTCOMM_KERN_VERSION;
1897
1898error_modules:
76d7553f
MD
1899 ret = close(kernel_tracer_fd);
1900 if (ret) {
1901 PERROR("close");
1902 }
096102bd
DG
1903
1904error_open:
1905 modprobe_remove_lttng_control();
b73401da
DG
1906
1907error:
b73401da 1908 WARN("No kernel tracer available");
a4b35e07 1909 kernel_tracer_fd = -1;
531d29f9
MD
1910 if (!is_root) {
1911 return LTTCOMM_NEED_ROOT_SESSIOND;
1912 } else {
1913 return LTTCOMM_KERN_NA;
1914 }
f3ed775e 1915}
33a2b854 1916
f3ed775e 1917/*
54d01ffb 1918 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1919 */
54d01ffb 1920static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1921{
f40799e8 1922 int ret = 0;
8c0faa1d 1923
3bd1e081 1924 if (session->consumer_fds_sent == 0) {
d9800920 1925 /*
54d01ffb 1926 * Assign default kernel consumer socket if no consumer assigned to the
03550b58 1927 * kernel session. At this point, it's NOT supposed to be -1 but this is
54d01ffb 1928 * an extra security check.
d9800920 1929 */
03550b58 1930 if (session->consumer_fd < 0) {
3bd1e081 1931 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1932 }
1933
2bdd86d4 1934 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1935 if (ret < 0) {
f3ed775e
DG
1936 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1937 goto error;
1938 }
1d4b027a 1939
3bd1e081 1940 session->consumer_fds_sent = 1;
f3ed775e 1941 }
1d4b027a
DG
1942
1943error:
1944 return ret;
8c0faa1d
DG
1945}
1946
0177d773
DG
1947/*
1948 * Create an UST session and add it to the session ust list.
1949 */
44d3bd01 1950static int create_ust_session(struct ltt_session *session,
6df2e2c9 1951 struct lttng_domain *domain)
0177d773 1952{
13384287 1953 struct ltt_ust_session *lus = NULL;
6df2e2c9 1954 int ret;
44d3bd01
DG
1955
1956 switch (domain->type) {
48842b30 1957 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1958 break;
1959 default:
13384287 1960 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1961 goto error;
1962 }
0177d773
DG
1963
1964 DBG("Creating UST session");
1965
a991f516 1966 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1967 if (lus == NULL) {
44d3bd01 1968 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1969 goto error;
1970 }
1971
e11d277b 1972 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1973 session->uid, session->gid);
0177d773
DG
1974 if (ret < 0) {
1975 if (ret != -EEXIST) {
1976 ERR("Trace directory creation error");
44d3bd01 1977 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1978 goto error;
1979 }
1980 }
1981
f6a9efaa
DG
1982 /* The domain type dictate different actions on session creation */
1983 switch (domain->type) {
48842b30
DG
1984 case LTTNG_DOMAIN_UST:
1985 /* No ustctl for the global UST domain */
1986 break;
1987 default:
36dc12cc 1988 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1989 goto error;
0177d773 1990 }
6df2e2c9
MD
1991 lus->uid = session->uid;
1992 lus->gid = session->gid;
f6a9efaa 1993 session->ust_session = lus;
44d3bd01
DG
1994
1995 return LTTCOMM_OK;
0177d773
DG
1996
1997error:
1998 free(lus);
1999 return ret;
2000}
2001
333f285e 2002/*
d063d709 2003 * Create a kernel tracer session then create the default channel.
333f285e 2004 */
6df2e2c9 2005static int create_kernel_session(struct ltt_session *session)
333f285e 2006{
f3ed775e 2007 int ret;
f3ed775e
DG
2008
2009 DBG("Creating kernel session");
2010
2011 ret = kernel_create_session(session, kernel_tracer_fd);
2012 if (ret < 0) {
2013 ret = LTTCOMM_KERN_SESS_FAIL;
2014 goto error;
333f285e
DG
2015 }
2016
d9800920 2017 /* Set kernel consumer socket fd */
03550b58 2018 if (kconsumer_data.cmd_sock >= 0) {
3bd1e081 2019 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
2020 }
2021
e11d277b 2022 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 2023 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 2024 if (ret < 0) {
996b65c8 2025 if (ret != -EEXIST) {
7a485870
DG
2026 ERR("Trace directory creation error");
2027 goto error;
2028 }
2029 }
6df2e2c9
MD
2030 session->kernel_session->uid = session->uid;
2031 session->kernel_session->gid = session->gid;
7a485870 2032
f3ed775e
DG
2033error:
2034 return ret;
333f285e
DG
2035}
2036
8e0af1b4 2037/*
c7704d57
DG
2038 * Check if the UID or GID match the session. Root user has access to all
2039 * sessions.
8e0af1b4 2040 */
c7704d57 2041static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 2042{
c7704d57 2043 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
2044 return 0;
2045 } else {
2046 return 1;
2047 }
2048}
2049
2050static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2051{
2052 unsigned int i = 0;
2053 struct ltt_session *session;
2054
2055 DBG("Counting number of available session for UID %d GID %d",
2056 uid, gid);
2057 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2058 /*
2059 * Only list the sessions the user can control.
2060 */
2061 if (!session_access_ok(session, uid, gid)) {
2062 continue;
2063 }
2064 i++;
2065 }
2066 return i;
2067}
2068
6c9cc2ab
DG
2069/*
2070 * Using the session list, filled a lttng_session array to send back to the
2071 * client for session listing.
2072 *
2073 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2074 * session_lock_list() and session_unlock_list().
6c9cc2ab 2075 */
c7704d57
DG
2076static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2077 gid_t gid)
6c9cc2ab 2078{
8e0af1b4 2079 unsigned int i = 0;
6c9cc2ab
DG
2080 struct ltt_session *session;
2081
8e0af1b4
MD
2082 DBG("Getting all available session for UID %d GID %d",
2083 uid, gid);
6c9cc2ab
DG
2084 /*
2085 * Iterate over session list and append data after the control struct in
2086 * the buffer.
2087 */
2088 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
2089 /*
2090 * Only list the sessions the user can control.
2091 */
2092 if (!session_access_ok(session, uid, gid)) {
2093 continue;
2094 }
6c9cc2ab 2095 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2096 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2097 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2098 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2099 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
2100 i++;
2101 }
2102}
2103
9f19cc17
DG
2104/*
2105 * Fill lttng_channel array of all channels.
2106 */
b551a063 2107static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2108 struct lttng_channel *channels)
2109{
2110 int i = 0;
2111 struct ltt_kernel_channel *kchan;
2112
2113 DBG("Listing channels for session %s", session->name);
2114
b551a063
DG
2115 switch (domain) {
2116 case LTTNG_DOMAIN_KERNEL:
2117 /* Kernel channels */
2118 if (session->kernel_session != NULL) {
2119 cds_list_for_each_entry(kchan,
2120 &session->kernel_session->channel_list.head, list) {
2121 /* Copy lttng_channel struct to array */
2122 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2123 channels[i].enabled = kchan->enabled;
2124 i++;
2125 }
2126 }
2127 break;
2128 case LTTNG_DOMAIN_UST:
2129 {
bec39940 2130 struct lttng_ht_iter iter;
b551a063
DG
2131 struct ltt_ust_channel *uchan;
2132
bec39940
DG
2133 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2134 &iter.iter, uchan, node.node) {
b551a063
DG
2135 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2136 channels[i].attr.overwrite = uchan->attr.overwrite;
2137 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2138 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2139 channels[i].attr.switch_timer_interval =
2140 uchan->attr.switch_timer_interval;
2141 channels[i].attr.read_timer_interval =
2142 uchan->attr.read_timer_interval;
aea829b3 2143 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2144 switch (uchan->attr.output) {
2145 case LTTNG_UST_MMAP:
2146 default:
2147 channels[i].attr.output = LTTNG_EVENT_MMAP;
2148 break;
2149 }
befe0905 2150 i++;
b551a063
DG
2151 }
2152 break;
2153 }
2154 default:
2155 break;
2156 }
2157}
2158
2159/*
2160 * Create a list of ust global domain events.
2161 */
2162static int list_lttng_ust_global_events(char *channel_name,
2163 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2164{
2165 int i = 0, ret = 0;
2166 unsigned int nb_event = 0;
bec39940
DG
2167 struct lttng_ht_iter iter;
2168 struct lttng_ht_node_str *node;
b551a063
DG
2169 struct ltt_ust_channel *uchan;
2170 struct ltt_ust_event *uevent;
2171 struct lttng_event *tmp;
2172
2173 DBG("Listing UST global events for channel %s", channel_name);
2174
2175 rcu_read_lock();
2176
bec39940
DG
2177 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2178 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2179 if (node == NULL) {
2180 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2181 goto error;
b551a063
DG
2182 }
2183
bec39940 2184 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2185
bec39940 2186 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2187
b551a063
DG
2188 if (nb_event == 0) {
2189 ret = nb_event;
2190 goto error;
2191 }
2192
2193 DBG3("Listing UST global %d events", nb_event);
2194
2195 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2196 if (tmp == NULL) {
2197 ret = -LTTCOMM_FATAL;
2198 goto error;
2199 }
2200
bec39940 2201 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2202 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2203 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2204 tmp[i].enabled = uevent->enabled;
2205 switch (uevent->attr.instrumentation) {
2206 case LTTNG_UST_TRACEPOINT:
2207 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2208 break;
2209 case LTTNG_UST_PROBE:
2210 tmp[i].type = LTTNG_EVENT_PROBE;
2211 break;
2212 case LTTNG_UST_FUNCTION:
2213 tmp[i].type = LTTNG_EVENT_FUNCTION;
2214 break;
0cda4f28 2215 }
8005f29a 2216 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2217 switch (uevent->attr.loglevel_type) {
8005f29a 2218 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2219 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2220 break;
8005f29a 2221 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2222 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2223 break;
2224 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2225 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2226 break;
9f19cc17 2227 }
d7b75b30 2228 i++;
9f19cc17
DG
2229 }
2230
b551a063
DG
2231 ret = nb_event;
2232 *events = tmp;
2233
2234error:
2235 rcu_read_unlock();
2236 return ret;
9f19cc17
DG
2237}
2238
2239/*
b551a063 2240 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2241 */
b551a063
DG
2242static int list_lttng_kernel_events(char *channel_name,
2243 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2244{
b551a063
DG
2245 int i = 0, ret;
2246 unsigned int nb_event;
9f19cc17 2247 struct ltt_kernel_event *event;
b551a063
DG
2248 struct ltt_kernel_channel *kchan;
2249
2250 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2251 if (kchan == NULL) {
2252 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2253 goto error;
2254 }
2255
2256 nb_event = kchan->event_count;
9f19cc17
DG
2257
2258 DBG("Listing events for channel %s", kchan->channel->name);
2259
b551a063
DG
2260 if (nb_event == 0) {
2261 ret = nb_event;
2262 goto error;
2263 }
2264
2265 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2266 if (*events == NULL) {
2267 ret = LTTCOMM_FATAL;
2268 goto error;
2269 }
2270
9f19cc17
DG
2271 /* Kernel channels */
2272 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2273 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2274 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2275 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2276 switch (event->event->instrumentation) {
2277 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2278 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2279 break;
2280 case LTTNG_KERNEL_KPROBE:
2281 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2282 (*events)[i].type = LTTNG_EVENT_PROBE;
2283 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2284 sizeof(struct lttng_kernel_kprobe));
2285 break;
2286 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2287 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2288 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2289 sizeof(struct lttng_kernel_function));
2290 break;
0133c199 2291 case LTTNG_KERNEL_NOOP:
b551a063 2292 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2293 break;
a54bd42d 2294 case LTTNG_KERNEL_SYSCALL:
b551a063 2295 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2296 break;
7a3d1328
MD
2297 case LTTNG_KERNEL_ALL:
2298 assert(0);
2299 break;
9f19cc17
DG
2300 }
2301 i++;
2302 }
b551a063
DG
2303
2304 return nb_event;
2305
2306error:
2307 return ret;
9f19cc17
DG
2308}
2309
fac6795d 2310/*
54d01ffb 2311 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2312 */
54d01ffb
DG
2313static int cmd_disable_channel(struct ltt_session *session,
2314 int domain, char *channel_name)
fac6795d 2315{
54d01ffb 2316 int ret;
78f0bacd
DG
2317 struct ltt_ust_session *usess;
2318
2319 usess = session->ust_session;
379473d2 2320
54d01ffb 2321 switch (domain) {
78f0bacd
DG
2322 case LTTNG_DOMAIN_KERNEL:
2323 {
2324 ret = channel_kernel_disable(session->kernel_session,
2325 channel_name);
2326 if (ret != LTTCOMM_OK) {
2327 goto error;
2328 }
54d01ffb 2329
78f0bacd
DG
2330 kernel_wait_quiescent(kernel_tracer_fd);
2331 break;
2332 }
2333 case LTTNG_DOMAIN_UST:
2334 {
2335 struct ltt_ust_channel *uchan;
bec39940 2336 struct lttng_ht *chan_ht;
78f0bacd 2337
7885e399
DG
2338 chan_ht = usess->domain_global.channels;
2339
2340 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2341 if (uchan == NULL) {
2342 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2343 goto error;
78f0bacd
DG
2344 }
2345
7885e399
DG
2346 ret = channel_ust_disable(usess, domain, uchan);
2347 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2348 goto error;
2349 }
78f0bacd
DG
2350 break;
2351 }
d78d6610 2352#if 0
78f0bacd
DG
2353 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2354 case LTTNG_DOMAIN_UST_EXEC_NAME:
2355 case LTTNG_DOMAIN_UST_PID:
d78d6610 2356#endif
78f0bacd
DG
2357 default:
2358 ret = LTTCOMM_UNKNOWN_DOMAIN;
2359 goto error;
20fe2104
DG
2360 }
2361
54d01ffb 2362 ret = LTTCOMM_OK;
d65106b1 2363
54d01ffb
DG
2364error:
2365 return ret;
2366}
2367
2368/*
2369 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2370 */
44d3bd01 2371static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2372 int domain, struct lttng_channel *attr)
54d01ffb
DG
2373{
2374 int ret;
f6a9efaa 2375 struct ltt_ust_session *usess = session->ust_session;
bec39940 2376 struct lttng_ht *chan_ht;
f6a9efaa 2377
5d56b5aa 2378 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2379
aea829b3 2380 switch (domain) {
44d3bd01
DG
2381 case LTTNG_DOMAIN_KERNEL:
2382 {
2383 struct ltt_kernel_channel *kchan;
54d01ffb 2384
44d3bd01
DG
2385 kchan = trace_kernel_get_channel_by_name(attr->name,
2386 session->kernel_session);
2387 if (kchan == NULL) {
2388 ret = channel_kernel_create(session->kernel_session,
2389 attr, kernel_poll_pipe[1]);
2390 } else {
2391 ret = channel_kernel_enable(session->kernel_session, kchan);
2392 }
2393
2394 if (ret != LTTCOMM_OK) {
2395 goto error;
2396 }
2397
2398 kernel_wait_quiescent(kernel_tracer_fd);
2399 break;
2400 }
f6a9efaa
DG
2401 case LTTNG_DOMAIN_UST:
2402 {
2403 struct ltt_ust_channel *uchan;
2404
7885e399 2405 chan_ht = usess->domain_global.channels;
f6a9efaa 2406
7885e399 2407 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2408 if (uchan == NULL) {
7885e399 2409 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2410 } else {
7885e399 2411 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2412 }
f6a9efaa
DG
2413 break;
2414 }
d78d6610 2415#if 0
78f0bacd
DG
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2417 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2418 case LTTNG_DOMAIN_UST_PID:
d78d6610 2419#endif
44d3bd01
DG
2420 default:
2421 ret = LTTCOMM_UNKNOWN_DOMAIN;
2422 goto error;
54d01ffb
DG
2423 }
2424
54d01ffb
DG
2425error:
2426 return ret;
2427}
2428
2429/*
2430 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2431 */
2432static int cmd_disable_event(struct ltt_session *session, int domain,
2433 char *channel_name, char *event_name)
2434{
2435 int ret;
54d01ffb
DG
2436
2437 switch (domain) {
2438 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2439 {
2440 struct ltt_kernel_channel *kchan;
b0a40d28 2441 struct ltt_kernel_session *ksess;
2bdd86d4 2442
b0a40d28
DG
2443 ksess = session->kernel_session;
2444
2445 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2446 if (kchan == NULL) {
2447 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2448 goto error;
d65106b1
DG
2449 }
2450
b0a40d28 2451 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2452 if (ret != LTTCOMM_OK) {
2453 goto error;
2454 }
2455
2456 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2457 break;
2bdd86d4
MD
2458 }
2459 case LTTNG_DOMAIN_UST:
b0a40d28 2460 {
b0a40d28 2461 struct ltt_ust_channel *uchan;
7f79d3a1 2462 struct ltt_ust_session *usess;
b0a40d28
DG
2463
2464 usess = session->ust_session;
2465
2466 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2467 channel_name);
2468 if (uchan == NULL) {
2469 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2470 goto error;
2471 }
2472
7f79d3a1
DG
2473 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2474 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2475 goto error;
2476 }
2477
7f79d3a1 2478 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2479 channel_name);
b0a40d28
DG
2480 break;
2481 }
d78d6610 2482#if 0
2bdd86d4
MD
2483 case LTTNG_DOMAIN_UST_EXEC_NAME:
2484 case LTTNG_DOMAIN_UST_PID:
2485 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2486#endif
54d01ffb 2487 default:
1ab1ea0b 2488 ret = LTTCOMM_UND;
54d01ffb 2489 goto error;
d65106b1 2490 }
26cc6b4e 2491
54d01ffb
DG
2492 ret = LTTCOMM_OK;
2493
2494error:
2495 return ret;
2496}
2497
2498/*
2499 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2500 */
2501static int cmd_disable_event_all(struct ltt_session *session, int domain,
2502 char *channel_name)
2503{
2504 int ret;
54d01ffb
DG
2505
2506 switch (domain) {
2507 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2508 {
2509 struct ltt_kernel_session *ksess;
2510 struct ltt_kernel_channel *kchan;
2511
2512 ksess = session->kernel_session;
2513
2514 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2515 if (kchan == NULL) {
2516 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2517 goto error;
26cc6b4e
DG
2518 }
2519
9730260e 2520 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2521 if (ret != LTTCOMM_OK) {
0b97ec54 2522 goto error;
26cc6b4e
DG
2523 }
2524
54d01ffb 2525 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2526 break;
9730260e
DG
2527 }
2528 case LTTNG_DOMAIN_UST:
2529 {
2530 struct ltt_ust_session *usess;
2531 struct ltt_ust_channel *uchan;
2532
2533 usess = session->ust_session;
2534
2535 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2536 channel_name);
2537 if (uchan == NULL) {
2538 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2539 goto error;
2540 }
2541
7f79d3a1
DG
2542 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2543 if (ret != 0) {
9730260e
DG
2544 goto error;
2545 }
2546
7f79d3a1 2547 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2548
2549 break;
2550 }
d78d6610 2551#if 0
9730260e
DG
2552 case LTTNG_DOMAIN_UST_EXEC_NAME:
2553 case LTTNG_DOMAIN_UST_PID:
2554 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2555#endif
54d01ffb 2556 default:
1ab1ea0b 2557 ret = LTTCOMM_UND;
54d01ffb 2558 goto error;
26cc6b4e 2559 }
e953ef25 2560
54d01ffb 2561 ret = LTTCOMM_OK;
e953ef25 2562
54d01ffb
DG
2563error:
2564 return ret;
2565}
f5177a38 2566
54d01ffb
DG
2567/*
2568 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2569 */
2570static int cmd_add_context(struct ltt_session *session, int domain,
2571 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2572{
2573 int ret;
f5177a38 2574
54d01ffb
DG
2575 switch (domain) {
2576 case LTTNG_DOMAIN_KERNEL:
2577 /* Add kernel context to kernel tracer */
2578 ret = context_kernel_add(session->kernel_session, ctx,
2579 event_name, channel_name);
2580 if (ret != LTTCOMM_OK) {
f5177a38 2581 goto error;
e953ef25 2582 }
2bdd86d4
MD
2583 break;
2584 case LTTNG_DOMAIN_UST:
2585 {
55cc08a6 2586 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2587
55cc08a6
DG
2588 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2589 if (ret != LTTCOMM_OK) {
2590 goto error;
2bdd86d4 2591 }
e953ef25 2592 break;
2bdd86d4 2593 }
d78d6610 2594#if 0
55cc08a6
DG
2595 case LTTNG_DOMAIN_UST_EXEC_NAME:
2596 case LTTNG_DOMAIN_UST_PID:
2597 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2598#endif
54d01ffb 2599 default:
1ab1ea0b 2600 ret = LTTCOMM_UND;
54d01ffb 2601 goto error;
e953ef25 2602 }
950131af 2603
54d01ffb 2604 ret = LTTCOMM_OK;
950131af 2605
54d01ffb
DG
2606error:
2607 return ret;
2608}
2609
2610/*
2611 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2612 */
2613static int cmd_enable_event(struct ltt_session *session, int domain,
2614 char *channel_name, struct lttng_event *event)
2615{
2616 int ret;
f6cd6b0f 2617 struct lttng_channel *attr;
48842b30 2618 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2619
2620 switch (domain) {
2621 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2622 {
2623 struct ltt_kernel_channel *kchan;
2624
54d01ffb
DG
2625 kchan = trace_kernel_get_channel_by_name(channel_name,
2626 session->kernel_session);
2627 if (kchan == NULL) {
f6cd6b0f
DG
2628 attr = channel_new_default_attr(domain);
2629 if (attr == NULL) {
2630 ret = LTTCOMM_FATAL;
2631 goto error;
2632 }
2633 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2634
54d01ffb 2635 /* This call will notify the kernel thread */
44d3bd01 2636 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2637 attr, kernel_poll_pipe[1]);
54d01ffb 2638 if (ret != LTTCOMM_OK) {
ff4d74e6 2639 free(attr);
f5177a38
DG
2640 goto error;
2641 }
ff4d74e6 2642 free(attr);
54d01ffb 2643 }
950131af 2644
54d01ffb
DG
2645 /* Get the newly created kernel channel pointer */
2646 kchan = trace_kernel_get_channel_by_name(channel_name,
2647 session->kernel_session);
2648 if (kchan == NULL) {
2649 /* This sould not happen... */
2650 ret = LTTCOMM_FATAL;
2651 goto error;
2652 }
f5177a38 2653
48842b30
DG
2654 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2655 event);
54d01ffb 2656 if (ret != LTTCOMM_OK) {
f5177a38 2657 goto error;
950131af
DG
2658 }
2659
54d01ffb 2660 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2661 break;
2bdd86d4
MD
2662 }
2663 case LTTNG_DOMAIN_UST:
2664 {
aea829b3 2665 struct lttng_channel *attr;
edb67388 2666 struct ltt_ust_channel *uchan;
2bdd86d4 2667
edb67388 2668 /* Get channel from global UST domain */
48842b30
DG
2669 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2670 channel_name);
2671 if (uchan == NULL) {
aea829b3
DG
2672 /* Create default channel */
2673 attr = channel_new_default_attr(domain);
2674 if (attr == NULL) {
2675 ret = LTTCOMM_FATAL;
2676 goto error;
2677 }
596219f7 2678 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2679 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2680
7885e399 2681 ret = channel_ust_create(usess, domain, attr);
edb67388 2682 if (ret != LTTCOMM_OK) {
ff4d74e6 2683 free(attr);
aea829b3
DG
2684 goto error;
2685 }
aea829b3
DG
2686 free(attr);
2687
2688 /* Get the newly created channel reference back */
2689 uchan = trace_ust_find_channel_by_name(
2690 usess->domain_global.channels, channel_name);
2691 if (uchan == NULL) {
2692 /* Something is really wrong */
2693 ret = LTTCOMM_FATAL;
2694 goto error;
2695 }
48842b30 2696 }
2bdd86d4 2697
edb67388 2698 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2699 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2700 if (ret != LTTCOMM_OK) {
48842b30 2701 goto error;
2bdd86d4
MD
2702 }
2703 break;
2704 }
d78d6610 2705#if 0
2bdd86d4
MD
2706 case LTTNG_DOMAIN_UST_EXEC_NAME:
2707 case LTTNG_DOMAIN_UST_PID:
2708 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2709#endif
54d01ffb 2710 default:
1ab1ea0b 2711 ret = LTTCOMM_UND;
54d01ffb 2712 goto error;
950131af 2713 }
d36b8583 2714
54d01ffb 2715 ret = LTTCOMM_OK;
d36b8583 2716
54d01ffb
DG
2717error:
2718 return ret;
2719}
7d29a247 2720
54d01ffb
DG
2721/*
2722 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2723 */
2724static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2725 char *channel_name, int event_type)
54d01ffb
DG
2726{
2727 int ret;
2728 struct ltt_kernel_channel *kchan;
7d29a247 2729
54d01ffb
DG
2730 switch (domain) {
2731 case LTTNG_DOMAIN_KERNEL:
2732 kchan = trace_kernel_get_channel_by_name(channel_name,
2733 session->kernel_session);
2734 if (kchan == NULL) {
2735 /* This call will notify the kernel thread */
44d3bd01
DG
2736 ret = channel_kernel_create(session->kernel_session, NULL,
2737 kernel_poll_pipe[1]);
54d01ffb
DG
2738 if (ret != LTTCOMM_OK) {
2739 goto error;
d36b8583 2740 }
0d0c377a 2741
8f69e5eb
DG
2742 /* Get the newly created kernel channel pointer */
2743 kchan = trace_kernel_get_channel_by_name(channel_name,
2744 session->kernel_session);
2745 if (kchan == NULL) {
2746 /* This sould not happen... */
2747 ret = LTTCOMM_FATAL;
2748 goto error;
2749 }
2750
54d01ffb 2751 }
0fdd1e2c 2752
7a3d1328 2753 switch (event_type) {
76d45b40 2754 case LTTNG_EVENT_SYSCALL:
7a3d1328 2755 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2756 kchan, kernel_tracer_fd);
7a3d1328 2757 break;
76d45b40 2758 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2759 /*
7a3d1328
MD
2760 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2761 * events already registered to the channel.
8c9ae521 2762 */
7a3d1328
MD
2763 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2764 kchan, kernel_tracer_fd);
2765 break;
76d45b40 2766 case LTTNG_EVENT_ALL:
7a3d1328 2767 /* Enable syscalls and tracepoints */
8c9ae521
DG
2768 ret = event_kernel_enable_all(session->kernel_session,
2769 kchan, kernel_tracer_fd);
7a3d1328
MD
2770 break;
2771 default:
2772 ret = LTTCOMM_KERN_ENABLE_FAIL;
2773 goto error;
8c9ae521 2774 }
8f69e5eb
DG
2775
2776 /* Manage return value */
54d01ffb 2777 if (ret != LTTCOMM_OK) {
0d0c377a 2778 goto error;
d36b8583
DG
2779 }
2780
54d01ffb 2781 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2782 break;
76d45b40
DG
2783 case LTTNG_DOMAIN_UST:
2784 {
2785 struct lttng_channel *attr;
2786 struct ltt_ust_channel *uchan;
2787 struct ltt_ust_session *usess = session->ust_session;
2788
2789 /* Get channel from global UST domain */
2790 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2791 channel_name);
2792 if (uchan == NULL) {
2793 /* Create default channel */
2794 attr = channel_new_default_attr(domain);
2795 if (attr == NULL) {
2796 ret = LTTCOMM_FATAL;
2797 goto error;
2798 }
2799 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2800 attr->name[NAME_MAX - 1] = '\0';
2801
2802 /* Use the internal command enable channel */
7885e399 2803 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2804 if (ret != LTTCOMM_OK) {
2805 free(attr);
2806 goto error;
2807 }
2808 free(attr);
2809
2810 /* Get the newly created channel reference back */
2811 uchan = trace_ust_find_channel_by_name(
2812 usess->domain_global.channels, channel_name);
2813 if (uchan == NULL) {
2814 /* Something is really wrong */
2815 ret = LTTCOMM_FATAL;
2816 goto error;
2817 }
2818 }
2819
2820 /* At this point, the session and channel exist on the tracer */
2821
2822 switch (event_type) {
2823 case LTTNG_EVENT_ALL:
2824 case LTTNG_EVENT_TRACEPOINT:
2825 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2826 if (ret != LTTCOMM_OK) {
2827 goto error;
2828 }
2829 break;
2830 default:
2831 ret = LTTCOMM_UST_ENABLE_FAIL;
2832 goto error;
2833 }
2834
2835 /* Manage return value */
2836 if (ret != LTTCOMM_OK) {
2837 goto error;
2838 }
2839
2840 break;
2841 }
d78d6610 2842#if 0
76d45b40
DG
2843 case LTTNG_DOMAIN_UST_EXEC_NAME:
2844 case LTTNG_DOMAIN_UST_PID:
2845 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2846#endif
54d01ffb 2847 default:
1ab1ea0b 2848 ret = LTTCOMM_UND;
54d01ffb 2849 goto error;
d36b8583 2850 }
f3ed775e 2851
54d01ffb
DG
2852 ret = LTTCOMM_OK;
2853
2854error:
2855 return ret;
2856}
2857
2858/*
2859 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2860 */
2861static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2862{
2863 int ret;
2864 ssize_t nb_events = 0;
2865
2866 switch (domain) {
2867 case LTTNG_DOMAIN_KERNEL:
2868 nb_events = kernel_list_events(kernel_tracer_fd, events);
2869 if (nb_events < 0) {
2870 ret = LTTCOMM_KERN_LIST_FAIL;
2871 goto error;
894be886 2872 }
54d01ffb 2873 break;
b551a063
DG
2874 case LTTNG_DOMAIN_UST:
2875 nb_events = ust_app_list_events(events);
2876 if (nb_events < 0) {
2877 ret = LTTCOMM_UST_LIST_FAIL;
2878 goto error;
2879 }
2880 break;
54d01ffb 2881 default:
1ab1ea0b 2882 ret = LTTCOMM_UND;
54d01ffb
DG
2883 goto error;
2884 }
894be886 2885
54d01ffb 2886 return nb_events;
7d29a247 2887
54d01ffb
DG
2888error:
2889 /* Return negative value to differentiate return code */
2890 return -ret;
2891}
b389abbe 2892
f37d259d
MD
2893/*
2894 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2895 */
2896static ssize_t cmd_list_tracepoint_fields(int domain,
2897 struct lttng_event_field **fields)
2898{
2899 int ret;
2900 ssize_t nb_fields = 0;
2901
2902 switch (domain) {
2903 case LTTNG_DOMAIN_UST:
2904 nb_fields = ust_app_list_event_fields(fields);
2905 if (nb_fields < 0) {
2906 ret = LTTCOMM_UST_LIST_FAIL;
2907 goto error;
2908 }
2909 break;
2910 case LTTNG_DOMAIN_KERNEL:
2911 default: /* fall-through */
2912 ret = LTTCOMM_UND;
2913 goto error;
2914 }
2915
2916 return nb_fields;
2917
2918error:
2919 /* Return negative value to differentiate return code */
2920 return -ret;
2921}
2922
54d01ffb
DG
2923/*
2924 * Command LTTNG_START_TRACE processed by the client thread.
2925 */
2926static int cmd_start_trace(struct ltt_session *session)
2927{
2928 int ret;
54d01ffb 2929 struct ltt_kernel_session *ksession;
b9d9b220 2930 struct ltt_ust_session *usess;
b389abbe 2931
54d01ffb
DG
2932 /* Short cut */
2933 ksession = session->kernel_session;
b9d9b220 2934 usess = session->ust_session;
5eb91c98 2935
b9ef1c83 2936 if (session->enabled) {
80e327fa
DG
2937 /* Already started. */
2938 ret = LTTCOMM_TRACE_ALREADY_STARTED;
b9ef1c83
DG
2939 goto error;
2940 }
2941
464dd62d
MD
2942 session->enabled = 1;
2943
54d01ffb
DG
2944 /* Kernel tracing */
2945 if (ksession != NULL) {
2bdd86d4
MD
2946 struct ltt_kernel_channel *kchan;
2947
54d01ffb
DG
2948 /* Open kernel metadata */
2949 if (ksession->metadata == NULL) {
2950 ret = kernel_open_metadata(ksession, ksession->trace_path);
2951 if (ret < 0) {
2952 ret = LTTCOMM_KERN_META_FAIL;
2953 goto error;
b389abbe 2954 }
54d01ffb 2955 }
7d29a247 2956
54d01ffb 2957 /* Open kernel metadata stream */
03550b58 2958 if (ksession->metadata_stream_fd < 0) {
54d01ffb
DG
2959 ret = kernel_open_metadata_stream(ksession);
2960 if (ret < 0) {
2961 ERR("Kernel create metadata stream failed");
2962 ret = LTTCOMM_KERN_STREAM_FAIL;
2963 goto error;
2964 }
2965 }
2966
2967 /* For each channel */
2968 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2969 if (kchan->stream_count == 0) {
2970 ret = kernel_open_channel_stream(kchan);
2971 if (ret < 0) {
2972 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2973 goto error;
2974 }
54d01ffb
DG
2975 /* Update the stream global counter */
2976 ksession->stream_count_global += ret;
7d29a247 2977 }
54d01ffb
DG
2978 }
2979
2980 /* Setup kernel consumer socket and send fds to it */
2981 ret = init_kernel_tracing(ksession);
2982 if (ret < 0) {
2983 ret = LTTCOMM_KERN_START_FAIL;
2984 goto error;
2985 }
2986
2987 /* This start the kernel tracing */
2988 ret = kernel_start_session(ksession);
2989 if (ret < 0) {
2990 ret = LTTCOMM_KERN_START_FAIL;
2991 goto error;
2992 }
2993
2994 /* Quiescent wait after starting trace */
2995 kernel_wait_quiescent(kernel_tracer_fd);
2996 }
2997
36dc12cc 2998 /* Flag session that trace should start automatically */
b9d9b220
DG
2999 if (usess) {
3000 usess->start_trace = 1;
36dc12cc 3001
b9d9b220
DG
3002 ret = ust_app_start_trace_all(usess);
3003 if (ret < 0) {
3004 ret = LTTCOMM_UST_START_FAIL;
3005 goto error;
3006 }
2bdd86d4 3007 }
54d01ffb
DG
3008
3009 ret = LTTCOMM_OK;
3010
3011error:
3012 return ret;
3013}
3014
3015/*
3016 * Command LTTNG_STOP_TRACE processed by the client thread.
3017 */
3018static int cmd_stop_trace(struct ltt_session *session)
3019{
3020 int ret;
3021 struct ltt_kernel_channel *kchan;
3022 struct ltt_kernel_session *ksession;
8be98f9a 3023 struct ltt_ust_session *usess;
54d01ffb
DG
3024
3025 /* Short cut */
3026 ksession = session->kernel_session;
8be98f9a 3027 usess = session->ust_session;
54d01ffb 3028
b9ef1c83 3029 if (!session->enabled) {
80e327fa 3030 ret = LTTCOMM_TRACE_ALREADY_STOPPED;
b9ef1c83
DG
3031 goto error;
3032 }
3033
464dd62d
MD
3034 session->enabled = 0;
3035
54d01ffb
DG
3036 /* Kernel tracer */
3037 if (ksession != NULL) {
3038 DBG("Stop kernel tracing");
3039
3040 /* Flush all buffers before stopping */
3041 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
3042 if (ret < 0) {
3043 ERR("Kernel metadata flush failed");
3044 }
f34daff7 3045
54d01ffb
DG
3046 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3047 ret = kernel_flush_buffer(kchan);
0d0c377a 3048 if (ret < 0) {
54d01ffb 3049 ERR("Kernel flush buffer error");
7d29a247 3050 }
54d01ffb 3051 }
19e70852 3052
54d01ffb
DG
3053 ret = kernel_stop_session(ksession);
3054 if (ret < 0) {
3055 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 3056 goto error;
f3ed775e 3057 }
54d01ffb
DG
3058
3059 kernel_wait_quiescent(kernel_tracer_fd);
894be886 3060 }
54d01ffb 3061
8be98f9a
MD
3062 if (usess) {
3063 usess->start_trace = 0;
2bdd86d4 3064
8be98f9a 3065 ret = ust_app_stop_trace_all(usess);
2bdd86d4 3066 if (ret < 0) {
190df5ac 3067 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
3068 goto error;
3069 }
2bdd86d4 3070 }
54d01ffb
DG
3071
3072 ret = LTTCOMM_OK;
3073
3074error:
3075 return ret;
3076}
3077
3078/*
3079 * Command LTTNG_CREATE_SESSION processed by the client thread.
3080 */
730389d9 3081static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
54d01ffb
DG
3082{
3083 int ret;
3084
730389d9
DG
3085 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
3086 LTTNG_SOCK_GET_GID_CRED(creds));
54d01ffb
DG
3087 if (ret != LTTCOMM_OK) {
3088 goto error;
3089 }
3090
3091 ret = LTTCOMM_OK;
3092
3093error:
3094 return ret;
3095}
3096
3097/*
3098 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3099 */
3100static int cmd_destroy_session(struct ltt_session *session, char *name)
3101{
3102 int ret;
3103
3104 /* Clean kernel session teardown */
3105 teardown_kernel_session(session);
84cd17c6
MD
3106 /* UST session teardown */
3107 teardown_ust_session(session);
54d01ffb
DG
3108
3109 /*
3110 * Must notify the kernel thread here to update it's poll setin order
3111 * to remove the channel(s)' fd just destroyed.
3112 */
3113 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3114 if (ret < 0) {
76d7553f 3115 PERROR("write kernel poll pipe");
54d01ffb
DG
3116 }
3117
271933a4 3118 ret = session_destroy(session);
54d01ffb
DG
3119
3120 return ret;
3121}
3122
3123/*
3124 * Command LTTNG_CALIBRATE processed by the client thread.
3125 */
3126static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3127{
3128 int ret;
3129
3130 switch (domain) {
3131 case LTTNG_DOMAIN_KERNEL:
33a2b854 3132 {
54d01ffb 3133 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3134
54d01ffb
DG
3135 kcalibrate.type = calibrate->type;
3136 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3137 if (ret < 0) {
54d01ffb
DG
3138 ret = LTTCOMM_KERN_ENABLE_FAIL;
3139 goto error;
33a2b854 3140 }
54d01ffb
DG
3141 break;
3142 }
4466912f
DG
3143 case LTTNG_DOMAIN_UST:
3144 {
3145 struct lttng_ust_calibrate ucalibrate;
3146
3147 ucalibrate.type = calibrate->type;
3148 ret = ust_app_calibrate_glb(&ucalibrate);
3149 if (ret < 0) {
3150 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3151 goto error;
3152 }
3153 break;
3154 }
54d01ffb 3155 default:
1ab1ea0b 3156 ret = LTTCOMM_UND;
54d01ffb
DG
3157 goto error;
3158 }
33a2b854 3159
54d01ffb 3160 ret = LTTCOMM_OK;
33a2b854 3161
54d01ffb
DG
3162error:
3163 return ret;
3164}
7d29a247 3165
54d01ffb
DG
3166/*
3167 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3168 */
3169static int cmd_register_consumer(struct ltt_session *session, int domain,
3170 char *sock_path)
3171{
3172 int ret, sock;
b389abbe 3173
54d01ffb
DG
3174 switch (domain) {
3175 case LTTNG_DOMAIN_KERNEL:
3176 /* Can't register a consumer if there is already one */
48c4f28c 3177 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3178 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3179 goto error;
3180 }
3181
3182 sock = lttcomm_connect_unix_sock(sock_path);
3183 if (sock < 0) {
3184 ret = LTTCOMM_CONNECT_FAIL;
3185 goto error;
3186 }
3187
3188 session->kernel_session->consumer_fd = sock;
3189 break;
3190 default:
3191 /* TODO: Userspace tracing */
1ab1ea0b 3192 ret = LTTCOMM_UND;
54d01ffb
DG
3193 goto error;
3194 }
3195
3196 ret = LTTCOMM_OK;
3197
3198error:
3199 return ret;
3200}
3201
3202/*
3203 * Command LTTNG_LIST_DOMAINS processed by the client thread.