Add UST default channel creation support
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
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14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
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33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
20fe2104 53#include "kernel-ctl.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 80const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
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89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d
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92static int opt_daemon;
93static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 94static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
95
96/* Consumer daemon specific control data */
97static struct consumer_data kconsumer_data = {
98 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
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99 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
100 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 101};
7753dea8
MD
102static struct consumer_data ustconsumer64_data = {
103 .type = LTTNG_CONSUMER64_UST,
104 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
106};
107static struct consumer_data ustconsumer32_data = {
108 .type = LTTNG_CONSUMER32_UST,
109 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
111};
112
099e26bd 113static int dispatch_thread_exit;
fac6795d 114
54d01ffb
DG
115/* Global application Unix socket path */
116static char apps_unix_sock_path[PATH_MAX];
117/* Global client Unix socket path */
118static char client_unix_sock_path[PATH_MAX];
54d01ffb
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119/* global wait shm path for UST */
120static char wait_shm_path[PATH_MAX];
fac6795d 121
1d4b027a 122/* Sockets and FDs */
d6f42150
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123static int client_sock;
124static int apps_sock;
20fe2104 125static int kernel_tracer_fd;
7a485870 126static int kernel_poll_pipe[2];
1d4b027a 127
273ea72c
DG
128/*
129 * Quit pipe for all threads. This permits a single cancellation point
130 * for all threads when receiving an event on the pipe.
131 */
132static int thread_quit_pipe[2];
133
099e26bd
DG
134/*
135 * This pipe is used to inform the thread managing application communication
136 * that a command is queued and ready to be processed.
137 */
138static int apps_cmd_pipe[2];
139
1d4b027a 140/* Pthread, Mutexes and Semaphores */
1d4b027a 141static pthread_t apps_thread;
099e26bd 142static pthread_t reg_apps_thread;
1d4b027a 143static pthread_t client_thread;
7a485870 144static pthread_t kernel_thread;
099e26bd 145static pthread_t dispatch_thread;
5eb91c98 146
fac6795d 147
099e26bd
DG
148/*
149 * UST registration command queue. This queue is tied with a futex and uses a N
150 * wakers / 1 waiter implemented and detailed in futex.c/.h
151 *
152 * The thread_manage_apps and thread_dispatch_ust_registration interact with
153 * this queue and the wait/wake scheme.
154 */
155static struct ust_cmd_queue ust_cmd_queue;
156
b5541356
DG
157/*
158 * Pointer initialized before thread creation.
159 *
160 * This points to the tracing session list containing the session count and a
161 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
162 * MUST NOT be taken if you call a public function in session.c.
04ea676f 163 *
d063d709 164 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 165 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
166 */
167static struct ltt_session_list *session_list_ptr;
168
7753dea8
MD
169int ust_consumerd64_fd = -1;
170int ust_consumerd32_fd = -1;
171
172static const char *consumerd64_prog = "lttng-consumerd";
173static const char *consumerd32_prog = "lttng-consumerd";
ba5d816e 174
7753dea8
MD
175static const char *consumerd64_bindir =
176 __stringify(CONFIG_64BIT_BINDIR);
177static const char *consumerd32_bindir =
178 __stringify(CONFIG_32BIT_BINDIR);
fb09408a
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179
180static
7753dea8 181void setup_consumerd_path(void)
fb09408a
MD
182{
183 const char *bindir;
184
7753dea8
MD
185 /*
186 * Allow INSTALL_BIN_PATH to be used as a target path for the
187 * native architecture size consumer if CONFIG_NBIT_BINDIR as
188 * not been defined.
189 */
190#if (CAA_BITS_PER_LONG == 64)
191 if (!consumerd64_bindir[0]) {
192 consumerd64_bindir = INSTALL_BIN_PATH;
193 }
194#elif (CAA_BITS_PER_LONG == 32)
195 if (!consumerd32_bindir[0]) {
196 consumerd32_bindir = INSTALL_BIN_PATH;
197 }
198#else
199#error "Unknown bitness"
200#endif
201
fb09408a
MD
202 /*
203 * runtime env. var. overrides the build default.
204 */
7753dea8
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205 bindir = getenv("LTTNG_TOOLS_64BIT_BINDIR");
206 if (bindir) {
207 consumerd64_bindir = bindir;
208 }
209 bindir = getenv("LTTNG_TOOLS_32BIT_BINDIR");
fb09408a 210 if (bindir) {
7753dea8 211 consumerd32_bindir = bindir;
fb09408a
MD
212 }
213}
214
5eb91c98
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215/*
216 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
217 */
218static int create_thread_poll_set(struct lttng_poll_event *events,
219 unsigned int size)
220{
221 int ret;
222
223 if (events == NULL || size == 0) {
224 ret = -1;
225 goto error;
226 }
227
228 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
229 if (ret < 0) {
230 goto error;
231 }
232
233 /* Add quit pipe */
234 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
235 if (ret < 0) {
236 goto error;
237 }
238
239 return 0;
240
241error:
242 return ret;
243}
244
245/*
246 * Check if the thread quit pipe was triggered.
247 *
248 * Return 1 if it was triggered else 0;
249 */
250static int check_thread_quit_pipe(int fd, uint32_t events)
251{
252 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
253 return 1;
254 }
255
256 return 0;
257}
258
0fdd1e2c
DG
259/*
260 * Remove modules in reverse load order.
261 */
262static int modprobe_remove_kernel_modules(void)
263{
264 int ret = 0, i;
265 char modprobe[256];
266
267 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
268 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 269 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
270 kernel_modules_list[i].name);
271 if (ret < 0) {
24b487b8 272 perror("snprintf modprobe -r");
0fdd1e2c
DG
273 goto error;
274 }
275 modprobe[sizeof(modprobe) - 1] = '\0';
276 ret = system(modprobe);
277 if (ret == -1) {
24b487b8 278 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
279 kernel_modules_list[i].name);
280 } else if (kernel_modules_list[i].required
281 && WEXITSTATUS(ret) != 0) {
282 ERR("Unable to remove module %s",
283 kernel_modules_list[i].name);
284 } else {
285 DBG("Modprobe removal successful %s",
286 kernel_modules_list[i].name);
287 }
288 }
289
290error:
291 return ret;
292}
293
294/*
295 * Return group ID of the tracing group or -1 if not found.
296 */
996b65c8
MD
297static gid_t allowed_group(void)
298{
299 struct group *grp;
300
274e143b
MD
301 if (opt_tracing_group) {
302 grp = getgrnam(opt_tracing_group);
303 } else {
304 grp = getgrnam(default_tracing_group);
305 }
996b65c8
MD
306 if (!grp) {
307 return -1;
308 } else {
309 return grp->gr_gid;
310 }
311}
312
273ea72c 313/*
5eb91c98 314 * Init thread quit pipe.
273ea72c
DG
315 *
316 * Return -1 on error or 0 if all pipes are created.
317 */
318static int init_thread_quit_pipe(void)
319{
320 int ret;
321
322 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
323 if (ret < 0) {
324 perror("thread quit pipe");
325 goto error;
326 }
327
328error:
329 return ret;
330}
331
fac6795d 332/*
d063d709
DG
333 * Complete teardown of a kernel session. This free all data structure related
334 * to a kernel session and update counter.
fac6795d 335 */
1d4b027a 336static void teardown_kernel_session(struct ltt_session *session)
fac6795d 337{
8f7a84dd
DG
338 if (!session->kernel_session) {
339 DBG3("No kernel session when tearingdown session");
84ea9c99 340 return;
8f7a84dd
DG
341 }
342
84ea9c99 343 DBG("Tearing down kernel session");
d9800920 344
84ea9c99
MD
345 /*
346 * If a custom kernel consumer was registered, close the socket before
347 * tearing down the complete kernel session structure
348 */
349 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
350 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 351 }
84ea9c99
MD
352
353 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
354}
355
f6a9efaa
DG
356/*
357 * Complete teardown of all UST sessions. This will free everything on his path
358 * and destroy the core essence of all ust sessions :)
359 */
360static void teardown_ust_session(struct ltt_session *session)
361{
84cd17c6
MD
362 int ret;
363
8f7a84dd
DG
364 if (!session->ust_session) {
365 DBG3("No UST session when tearingdown session");
f470a390 366 return;
8f7a84dd
DG
367 }
368
84ea9c99 369 DBG("Tearing down UST session(s)");
8f7a84dd 370
84cd17c6
MD
371 ret = ust_app_destroy_trace_all(session->ust_session);
372 if (ret) {
373 ERR("Error in ust_app_destroy_trace_all");
374 }
8f7a84dd 375
f6a9efaa
DG
376 trace_ust_destroy_session(session->ust_session);
377}
378
099e26bd
DG
379/*
380 * Stop all threads by closing the thread quit pipe.
381 */
cf3af59e
MD
382static void stop_threads(void)
383{
5eb91c98
DG
384 int ret;
385
cf3af59e
MD
386 /* Stopping all threads */
387 DBG("Terminating all threads");
54d01ffb 388 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
389 if (ret < 0) {
390 ERR("write error on thread quit pipe");
391 }
392
099e26bd
DG
393 /* Dispatch thread */
394 dispatch_thread_exit = 1;
395 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
396}
397
fac6795d 398/*
d063d709 399 * Cleanup the daemon
fac6795d 400 */
cf3af59e 401static void cleanup(void)
fac6795d 402{
1d4b027a
DG
403 int ret;
404 char *cmd;
af9737e9 405 struct ltt_session *sess, *stmp;
fac6795d 406
1d4b027a 407 DBG("Cleaning up");
e07ae692 408
5eb91c98
DG
409 if (is_root) {
410 DBG("Removing %s directory", LTTNG_RUNDIR);
411 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
412 if (ret < 0) {
413 ERR("asprintf failed. Something is really wrong!");
414 }
5461b305 415
5eb91c98
DG
416 /* Remove lttng run directory */
417 ret = system(cmd);
418 if (ret < 0) {
419 ERR("Unable to clean " LTTNG_RUNDIR);
420 }
1d4b027a 421 }
5461b305 422
1d4b027a 423 DBG("Cleaning up all session");
fac6795d 424
b5541356 425 /* Destroy session list mutex */
273ea72c
DG
426 if (session_list_ptr != NULL) {
427 pthread_mutex_destroy(&session_list_ptr->lock);
428
429 /* Cleanup ALL session */
54d01ffb
DG
430 cds_list_for_each_entry_safe(sess, stmp,
431 &session_list_ptr->head, list) {
273ea72c 432 teardown_kernel_session(sess);
f6a9efaa
DG
433 teardown_ust_session(sess);
434 free(sess);
273ea72c
DG
435 }
436 }
437
099e26bd 438 DBG("Closing all UST sockets");
56fff090 439 ust_app_clean_list();
099e26bd 440
3bd1e081 441 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 442
f3ed775e 443 DBG("Closing kernel fd");
1d4b027a 444 close(kernel_tracer_fd);
ab147185 445
2f50c8a3
DG
446 if (is_root) {
447 DBG("Unloading kernel modules");
448 modprobe_remove_kernel_modules();
449 }
5eb91c98
DG
450
451 close(thread_quit_pipe[0]);
452 close(thread_quit_pipe[1]);
421cb601
DG
453
454 /* <fun> */
455 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
456 "Matthew, BEET driven development works!%c[%dm",
457 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
458 /* </fun> */
fac6795d
DG
459}
460
e065084a 461/*
d063d709 462 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 463 *
d063d709 464 * Return lttcomm error code.
e065084a
DG
465 */
466static int send_unix_sock(int sock, void *buf, size_t len)
467{
468 /* Check valid length */
469 if (len <= 0) {
470 return -1;
471 }
472
473 return lttcomm_send_unix_sock(sock, buf, len);
474}
475
5461b305 476/*
d063d709 477 * Free memory of a command context structure.
5461b305 478 */
a2fb29a5 479static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 480{
a2fb29a5
DG
481 DBG("Clean command context structure");
482 if (*cmd_ctx) {
483 if ((*cmd_ctx)->llm) {
484 free((*cmd_ctx)->llm);
5461b305 485 }
a2fb29a5
DG
486 if ((*cmd_ctx)->lsm) {
487 free((*cmd_ctx)->lsm);
5461b305 488 }
a2fb29a5
DG
489 free(*cmd_ctx);
490 *cmd_ctx = NULL;
5461b305
DG
491 }
492}
493
f3ed775e 494/*
d063d709 495 * Send all stream fds of kernel channel to the consumer.
f3ed775e 496 */
2bdd86d4 497static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 498 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
499{
500 int ret;
f3ed775e 501 struct ltt_kernel_stream *stream;
3bd1e081 502 struct lttcomm_consumer_msg lkm;
f3ed775e 503
3bd1e081 504 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 505 channel->channel->name);
f3ed775e 506
3bd1e081
MD
507 /* Send channel */
508 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
509 lkm.u.channel.channel_key = channel->fd;
510 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
511 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 512 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 513 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 514 if (ret < 0) {
3bd1e081 515 perror("send consumer channel");
f3ed775e
DG
516 goto error;
517 }
518
3bd1e081 519 /* Send streams */
7a485870 520 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
521 if (!stream->fd) {
522 continue;
523 }
524 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
525 lkm.u.stream.channel_key = channel->fd;
526 lkm.u.stream.stream_key = stream->fd;
527 lkm.u.stream.state = stream->state;
528 lkm.u.stream.output = channel->channel->attr.output;
529 lkm.u.stream.mmap_len = 0; /* for kernel */
530 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
531 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
532 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
533 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
534 if (ret < 0) {
535 perror("send consumer stream");
536 goto error;
537 }
538 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
539 if (ret < 0) {
540 perror("send consumer stream ancillary data");
541 goto error;
f3ed775e
DG
542 }
543 }
544
3bd1e081 545 DBG("consumer channel streams sent");
f3ed775e
DG
546
547 return 0;
548
549error:
550 return ret;
551}
552
553/*
d063d709 554 * Send all stream fds of the kernel session to the consumer.
f3ed775e 555 */
2bdd86d4 556static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 557 struct ltt_kernel_session *session)
f3ed775e
DG
558{
559 int ret;
560 struct ltt_kernel_channel *chan;
3bd1e081
MD
561 struct lttcomm_consumer_msg lkm;
562 int sock = session->consumer_fd;
7a485870
DG
563
564 DBG("Sending metadata stream fd");
565
2bdd86d4 566 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 567 if (session->consumer_fd == 0) {
3bd1e081 568 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
569 }
570
7a485870 571 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
572 /* Send metadata channel fd */
573 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
574 lkm.u.channel.channel_key = session->metadata->fd;
575 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
576 lkm.u.channel.mmap_len = 0; /* for kernel */
577 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
578 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
579 if (ret < 0) {
580 perror("send consumer channel");
581 goto error;
582 }
583
584 /* Send metadata stream fd */
585 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
586 lkm.u.stream.channel_key = session->metadata->fd;
587 lkm.u.stream.stream_key = session->metadata_stream_fd;
588 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
589 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
590 lkm.u.stream.mmap_len = 0; /* for kernel */
591 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
592 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
593 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
594 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
595 if (ret < 0) {
596 perror("send consumer stream");
597 goto error;
598 }
599 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 600 if (ret < 0) {
3bd1e081 601 perror("send consumer stream");
7a485870
DG
602 goto error;
603 }
604 }
f3ed775e 605
f3ed775e 606 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
607 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
608 if (ret < 0) {
609 goto error;
610 }
611 }
612
613 DBG("consumer fds (metadata and channel streams) sent");
614
615 return 0;
616
617error:
618 return ret;
619}
620
fac6795d 621/*
0fdd1e2c 622 * Notify UST applications using the shm mmap futex.
fac6795d 623 */
0fdd1e2c 624static int notify_ust_apps(int active)
fac6795d 625{
0fdd1e2c 626 char *wait_shm_mmap;
fac6795d 627
0fdd1e2c 628 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 629
0fdd1e2c
DG
630 /* See shm.c for this call implying mmap, shm and futex calls */
631 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
632 if (wait_shm_mmap == NULL) {
fac6795d
DG
633 goto error;
634 }
635
0fdd1e2c
DG
636 /* Wake waiting process */
637 futex_wait_update((int32_t *) wait_shm_mmap, active);
638
639 /* Apps notified successfully */
640 return 0;
fac6795d
DG
641
642error:
0fdd1e2c 643 return -1;
fac6795d
DG
644}
645
e065084a 646/*
d063d709
DG
647 * Setup the outgoing data buffer for the response (llm) by allocating the
648 * right amount of memory and copying the original information from the lsm
649 * structure.
ca95a216 650 *
d063d709 651 * Return total size of the buffer pointed by buf.
ca95a216 652 */
5461b305 653static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 654{
f3ed775e 655 int ret, buf_size;
ca95a216 656
f3ed775e 657 buf_size = size;
5461b305 658
ba7f0ae5 659 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 660 if (cmd_ctx->llm == NULL) {
ba7f0ae5 661 perror("zmalloc");
5461b305 662 ret = -ENOMEM;
ca95a216
DG
663 goto error;
664 }
665
5461b305
DG
666 /* Copy common data */
667 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 668 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 669
5461b305
DG
670 cmd_ctx->llm->data_size = size;
671 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
672
ca95a216
DG
673 return buf_size;
674
675error:
676 return ret;
677}
678
7a485870 679/*
5eb91c98 680 * Update the kernel poll set of all channel fd available over all tracing
d063d709 681 * session. Add the wakeup pipe at the end of the set.
7a485870 682 */
5eb91c98 683static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 684{
5eb91c98 685 int ret;
7a485870
DG
686 struct ltt_session *session;
687 struct ltt_kernel_channel *channel;
688
5eb91c98 689 DBG("Updating kernel poll set");
7a485870 690
54d01ffb 691 session_lock_list();
b5541356 692 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 693 session_lock(session);
7a485870 694 if (session->kernel_session == NULL) {
54d01ffb 695 session_unlock(session);
7a485870
DG
696 continue;
697 }
7a485870 698
54d01ffb
DG
699 cds_list_for_each_entry(channel,
700 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
701 /* Add channel fd to the kernel poll set */
702 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
703 if (ret < 0) {
54d01ffb 704 session_unlock(session);
5eb91c98
DG
705 goto error;
706 }
707 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 708 }
54d01ffb 709 session_unlock(session);
7a485870 710 }
54d01ffb 711 session_unlock_list();
7a485870 712
5eb91c98 713 return 0;
7a485870
DG
714
715error:
54d01ffb 716 session_unlock_list();
7a485870
DG
717 return -1;
718}
719
720/*
54d01ffb 721 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 722 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 723 *
d063d709 724 * Useful for CPU hotplug feature.
7a485870 725 */
2bdd86d4 726static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
727{
728 int ret = 0;
729 struct ltt_session *session;
730 struct ltt_kernel_channel *channel;
731
732 DBG("Updating kernel streams for channel fd %d", fd);
733
54d01ffb 734 session_lock_list();
b5541356 735 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 736 session_lock(session);
7a485870 737 if (session->kernel_session == NULL) {
54d01ffb 738 session_unlock(session);
7a485870
DG
739 continue;
740 }
d9800920
DG
741
742 /* This is not suppose to be 0 but this is an extra security check */
743 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 744 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
745 }
746
5eb91c98
DG
747 cds_list_for_each_entry(channel,
748 &session->kernel_session->channel_list.head, list) {
7a485870
DG
749 if (channel->fd == fd) {
750 DBG("Channel found, updating kernel streams");
751 ret = kernel_open_channel_stream(channel);
752 if (ret < 0) {
b3c750d2 753 goto error;
7a485870 754 }
d9800920 755
7a485870 756 /*
5eb91c98
DG
757 * Have we already sent fds to the consumer? If yes, it means
758 * that tracing is started so it is safe to send our updated
759 * stream fds.
7a485870 760 */
3bd1e081 761 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 762 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 763 session->kernel_session->consumer_fd, channel);
7a485870 764 if (ret < 0) {
b3c750d2 765 goto error;
7a485870
DG
766 }
767 }
b3c750d2 768 goto error;
7a485870
DG
769 }
770 }
54d01ffb 771 session_unlock(session);
7a485870 772 }
54d01ffb 773 session_unlock_list();
b3c750d2 774 return ret;
7a485870 775
b3c750d2 776error:
54d01ffb
DG
777 session_unlock(session);
778 session_unlock_list();
7a485870
DG
779 return ret;
780}
781
487cf67c
DG
782/*
783 * For each tracing session, update newly registered apps.
784 */
785static void update_ust_app(int app_sock)
786{
787 struct ltt_session *sess, *stmp;
788
789 /* For all tracing session(s) */
790 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
791 if (sess->ust_session) {
792 ust_app_global_update(sess->ust_session, app_sock);
793 }
487cf67c
DG
794 }
795}
796
7a485870 797/*
d063d709 798 * This thread manage event coming from the kernel.
7a485870 799 *
d063d709
DG
800 * Features supported in this thread:
801 * -) CPU Hotplug
7a485870
DG
802 */
803static void *thread_manage_kernel(void *data)
804{
5eb91c98
DG
805 int ret, i, pollfd, update_poll_flag = 1;
806 uint32_t revents, nb_fd;
7a485870 807 char tmp;
5eb91c98 808 struct lttng_poll_event events;
7a485870
DG
809
810 DBG("Thread manage kernel started");
811
5eb91c98
DG
812 ret = create_thread_poll_set(&events, 2);
813 if (ret < 0) {
814 goto error;
815 }
816
817 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
818 if (ret < 0) {
819 goto error;
820 }
821
7a485870
DG
822 while (1) {
823 if (update_poll_flag == 1) {
5f822d0a
DG
824 /*
825 * Reset number of fd in the poll set. Always 2 since there is the thread
826 * quit pipe and the kernel pipe.
827 */
828 events.nb_fd = 2;
829
5eb91c98
DG
830 ret = update_kernel_poll(&events);
831 if (ret < 0) {
7a485870
DG
832 goto error;
833 }
834 update_poll_flag = 0;
835 }
836
5eb91c98
DG
837 nb_fd = LTTNG_POLL_GETNB(&events);
838
839 DBG("Thread kernel polling on %d fds", nb_fd);
840
841 /* Zeroed the poll events */
842 lttng_poll_reset(&events);
7a485870
DG
843
844 /* Poll infinite value of time */
5eb91c98 845 ret = lttng_poll_wait(&events, -1);
7a485870 846 if (ret < 0) {
7a485870
DG
847 goto error;
848 } else if (ret == 0) {
849 /* Should not happen since timeout is infinite */
85611738
DG
850 ERR("Return value of poll is 0 with an infinite timeout.\n"
851 "This should not have happened! Continuing...");
7a485870
DG
852 continue;
853 }
854
5eb91c98
DG
855 for (i = 0; i < nb_fd; i++) {
856 /* Fetch once the poll data */
857 revents = LTTNG_POLL_GETEV(&events, i);
858 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 859
5eb91c98
DG
860 /* Thread quit pipe has been closed. Killing thread. */
861 ret = check_thread_quit_pipe(pollfd, revents);
862 if (ret) {
863 goto error;
864 }
7a485870 865
5eb91c98
DG
866 /* Check for data on kernel pipe */
867 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
868 ret = read(kernel_poll_pipe[0], &tmp, 1);
869 update_poll_flag = 1;
870 continue;
871 } else {
872 /*
873 * New CPU detected by the kernel. Adding kernel stream to
874 * kernel session and updating the kernel consumer
875 */
876 if (revents & LPOLLIN) {
2bdd86d4 877 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
878 if (ret < 0) {
879 continue;
880 }
881 break;
882 /*
883 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
884 * and unregister kernel stream at this point.
885 */
7a485870 886 }
7a485870
DG
887 }
888 }
889 }
890
891error:
892 DBG("Kernel thread dying");
273ea72c
DG
893 close(kernel_poll_pipe[0]);
894 close(kernel_poll_pipe[1]);
5eb91c98
DG
895
896 lttng_poll_clean(&events);
897
7a485870
DG
898 return NULL;
899}
900
1d4b027a 901/*
3bd1e081 902 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 903 */
3bd1e081 904static void *thread_manage_consumer(void *data)
1d4b027a 905{
5eb91c98
DG
906 int sock = 0, i, ret, pollfd;
907 uint32_t revents, nb_fd;
1d4b027a 908 enum lttcomm_return_code code;
5eb91c98 909 struct lttng_poll_event events;
3bd1e081 910 struct consumer_data *consumer_data = data;
1d4b027a 911
3bd1e081 912 DBG("[thread] Manage consumer started");
1d4b027a 913
3bd1e081 914 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
915 if (ret < 0) {
916 goto error;
917 }
918
5eb91c98
DG
919 /*
920 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
921 * Nothing more will be added to this poll set.
922 */
923 ret = create_thread_poll_set(&events, 2);
924 if (ret < 0) {
925 goto error;
926 }
273ea72c 927
3bd1e081 928 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
929 if (ret < 0) {
930 goto error;
931 }
932
933 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
934
935 /* Inifinite blocking call, waiting for transmission */
5eb91c98 936 ret = lttng_poll_wait(&events, -1);
273ea72c 937 if (ret < 0) {
273ea72c
DG
938 goto error;
939 }
940
5eb91c98
DG
941 for (i = 0; i < nb_fd; i++) {
942 /* Fetch once the poll data */
943 revents = LTTNG_POLL_GETEV(&events, i);
944 pollfd = LTTNG_POLL_GETFD(&events, i);
945
946 /* Thread quit pipe has been closed. Killing thread. */
947 ret = check_thread_quit_pipe(pollfd, revents);
948 if (ret) {
949 goto error;
950 }
951
952 /* Event on the registration socket */
3bd1e081 953 if (pollfd == consumer_data->err_sock) {
5eb91c98 954 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 955 ERR("consumer err socket poll error");
5eb91c98
DG
956 goto error;
957 }
958 }
273ea72c
DG
959 }
960
3bd1e081 961 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
962 if (sock < 0) {
963 goto error;
964 }
965
3bd1e081 966 DBG2("Receiving code from consumer err_sock");
ee0b0061 967
712ea556 968 /* Getting status code from kconsumerd */
54d01ffb
DG
969 ret = lttcomm_recv_unix_sock(sock, &code,
970 sizeof(enum lttcomm_return_code));
1d4b027a
DG
971 if (ret <= 0) {
972 goto error;
973 }
974
3bd1e081
MD
975 if (code == CONSUMERD_COMMAND_SOCK_READY) {
976 consumer_data->cmd_sock =
977 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
978 if (consumer_data->cmd_sock < 0) {
979 sem_post(&consumer_data->sem);
48842b30 980 PERROR("consumer connect");
1d4b027a
DG
981 goto error;
982 }
983 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
984 sem_post(&consumer_data->sem);
985 DBG("consumer command socket ready");
1d4b027a 986 } else {
3bd1e081 987 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
988 lttcomm_get_readable_code(-code));
989 goto error;
990 }
991
54d01ffb 992 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 993 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 994 if (ret < 0) {
72079cae
DG
995 goto error;
996 }
997
5eb91c98
DG
998 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
999 if (ret < 0) {
72079cae 1000 goto error;
5eb91c98
DG
1001 }
1002
1003 /* Update number of fd */
1004 nb_fd = LTTNG_POLL_GETNB(&events);
1005
1006 /* Inifinite blocking call, waiting for transmission */
1007 ret = lttng_poll_wait(&events, -1);
1008 if (ret < 0) {
72079cae
DG
1009 goto error;
1010 }
1011
5eb91c98
DG
1012 for (i = 0; i < nb_fd; i++) {
1013 /* Fetch once the poll data */
1014 revents = LTTNG_POLL_GETEV(&events, i);
1015 pollfd = LTTNG_POLL_GETFD(&events, i);
1016
1017 /* Thread quit pipe has been closed. Killing thread. */
1018 ret = check_thread_quit_pipe(pollfd, revents);
1019 if (ret) {
1020 goto error;
1021 }
1022
1023 /* Event on the kconsumerd socket */
1024 if (pollfd == sock) {
1025 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1026 ERR("consumer err socket second poll error");
5eb91c98
DG
1027 goto error;
1028 }
1029 }
1030 }
1031
712ea556 1032 /* Wait for any kconsumerd error */
54d01ffb
DG
1033 ret = lttcomm_recv_unix_sock(sock, &code,
1034 sizeof(enum lttcomm_return_code));
712ea556 1035 if (ret <= 0) {
3bd1e081 1036 ERR("consumer closed the command socket");
712ea556 1037 goto error;
6f61d021 1038 }
1d4b027a 1039
3bd1e081 1040 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1041
1d4b027a 1042error:
3bd1e081
MD
1043 DBG("consumer thread dying");
1044 close(consumer_data->err_sock);
1045 close(consumer_data->cmd_sock);
5eb91c98 1046 close(sock);
273ea72c 1047
3bd1e081
MD
1048 unlink(consumer_data->err_unix_sock_path);
1049 unlink(consumer_data->cmd_unix_sock_path);
1050 consumer_data->pid = 0;
1d4b027a 1051
5eb91c98 1052 lttng_poll_clean(&events);
0177d773 1053
5eb91c98 1054 return NULL;
099e26bd
DG
1055}
1056
099e26bd
DG
1057/*
1058 * This thread manage application communication.
1d4b027a
DG
1059 */
1060static void *thread_manage_apps(void *data)
099e26bd 1061{
5eb91c98
DG
1062 int i, ret, pollfd;
1063 uint32_t revents, nb_fd;
099e26bd 1064 struct ust_command ust_cmd;
5eb91c98 1065 struct lttng_poll_event events;
099e26bd
DG
1066
1067 DBG("[thread] Manage application started");
1068
f6a9efaa
DG
1069 rcu_register_thread();
1070 rcu_thread_online();
1071
5eb91c98
DG
1072 ret = create_thread_poll_set(&events, 2);
1073 if (ret < 0) {
1074 goto error;
1075 }
099e26bd 1076
5eb91c98
DG
1077 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1078 if (ret < 0) {
1079 goto error;
1080 }
099e26bd 1081
5eb91c98
DG
1082 while (1) {
1083 /* Zeroed the events structure */
1084 lttng_poll_reset(&events);
0177d773 1085
5eb91c98 1086 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1087
1088 DBG("Apps thread polling on %d fds", nb_fd);
1089
1090 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1091 ret = lttng_poll_wait(&events, -1);
099e26bd 1092 if (ret < 0) {
099e26bd
DG
1093 goto error;
1094 }
1095
5eb91c98
DG
1096 for (i = 0; i < nb_fd; i++) {
1097 /* Fetch once the poll data */
1098 revents = LTTNG_POLL_GETEV(&events, i);
1099 pollfd = LTTNG_POLL_GETFD(&events, i);
1100
1101 /* Thread quit pipe has been closed. Killing thread. */
1102 ret = check_thread_quit_pipe(pollfd, revents);
1103 if (ret) {
099e26bd 1104 goto error;
5eb91c98 1105 }
099e26bd 1106
5eb91c98
DG
1107 /* Inspect the apps cmd pipe */
1108 if (pollfd == apps_cmd_pipe[0]) {
1109 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1110 ERR("Apps command pipe error");
0177d773 1111 goto error;
5eb91c98
DG
1112 } else if (revents & LPOLLIN) {
1113 /* Empty pipe */
1114 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1115 if (ret < 0 || ret < sizeof(ust_cmd)) {
1116 perror("read apps cmd pipe");
1117 goto error;
1118 }
099e26bd 1119
5eb91c98 1120 /* Register applicaton to the session daemon */
56fff090 1121 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1122 ust_cmd.sock);
88ff5b7f 1123 if (ret == -ENOMEM) {
5eb91c98 1124 goto error;
88ff5b7f
MD
1125 } else if (ret < 0) {
1126 break;
5eb91c98
DG
1127 }
1128
acc7b41b
MD
1129 /*
1130 * Add channel(s) and event(s) to newly registered apps
1131 * from lttng global UST domain.
1132 */
1133 update_ust_app(ust_cmd.sock);
1134
5eb91c98
DG
1135 ret = ustctl_register_done(ust_cmd.sock);
1136 if (ret < 0) {
1137 /*
1138 * If the registration is not possible, we simply
1139 * unregister the apps and continue
1140 */
56fff090 1141 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1142 } else {
1143 /*
1144 * We just need here to monitor the close of the UST
1145 * socket and poll set monitor those by default.
1146 */
1147 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1148 if (ret < 0) {
1149 goto error;
1150 }
1151
54d01ffb
DG
1152 DBG("Apps with sock %d added to poll set",
1153 ust_cmd.sock);
5eb91c98 1154 }
487cf67c 1155
5eb91c98 1156 break;
0177d773 1157 }
5eb91c98
DG
1158 } else {
1159 /*
54d01ffb
DG
1160 * At this point, we know that a registered application made
1161 * the event at poll_wait.
5eb91c98
DG
1162 */
1163 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1164 /* Removing from the poll set */
1165 ret = lttng_poll_del(&events, pollfd);
1166 if (ret < 0) {
1167 goto error;
1168 }
099e26bd 1169
b9d9b220 1170 /* Socket closed on remote end. */
56fff090 1171 ust_app_unregister(pollfd);
5eb91c98
DG
1172 break;
1173 }
099e26bd
DG
1174 }
1175 }
099e26bd
DG
1176 }
1177
1178error:
1179 DBG("Application communication apps dying");
1180 close(apps_cmd_pipe[0]);
1181 close(apps_cmd_pipe[1]);
1182
5eb91c98 1183 lttng_poll_clean(&events);
099e26bd 1184
f6a9efaa
DG
1185 rcu_thread_offline();
1186 rcu_unregister_thread();
099e26bd
DG
1187 return NULL;
1188}
1189
1190/*
1191 * Dispatch request from the registration threads to the application
1192 * communication thread.
1193 */
1194static void *thread_dispatch_ust_registration(void *data)
1195{
1196 int ret;
1197 struct cds_wfq_node *node;
1198 struct ust_command *ust_cmd = NULL;
1199
1200 DBG("[thread] Dispatch UST command started");
1201
1202 while (!dispatch_thread_exit) {
1203 /* Atomically prepare the queue futex */
1204 futex_nto1_prepare(&ust_cmd_queue.futex);
1205
1206 do {
1207 /* Dequeue command for registration */
1208 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1209 if (node == NULL) {
00a17c97 1210 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1211 /* Continue thread execution */
1212 break;
1213 }
1214
1215 ust_cmd = caa_container_of(node, struct ust_command, node);
1216
2f50c8a3
DG
1217 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1218 " gid:%d sock:%d name:%s (version %d.%d)",
1219 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1220 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1221 ust_cmd->sock, ust_cmd->reg_msg.name,
1222 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1223 /*
1224 * Inform apps thread of the new application registration. This
1225 * call is blocking so we can be assured that the data will be read
1226 * at some point in time or wait to the end of the world :)
1227 */
1228 ret = write(apps_cmd_pipe[1], ust_cmd,
1229 sizeof(struct ust_command));
1230 if (ret < 0) {
1231 perror("write apps cmd pipe");
1232 if (errno == EBADF) {
1233 /*
1234 * We can't inform the application thread to process
1235 * registration. We will exit or else application
1236 * registration will not occur and tracing will never
1237 * start.
1238 */
1239 goto error;
1240 }
1241 }
1242 free(ust_cmd);
1243 } while (node != NULL);
1244
1245 /* Futex wait on queue. Blocking call on futex() */
1246 futex_nto1_wait(&ust_cmd_queue.futex);
1247 }
1248
1249error:
1250 DBG("Dispatch thread dying");
1251 return NULL;
1252}
1253
1254/*
1255 * This thread manage application registration.
1256 */
1257static void *thread_registration_apps(void *data)
1d4b027a 1258{
5eb91c98
DG
1259 int sock = 0, i, ret, pollfd;
1260 uint32_t revents, nb_fd;
1261 struct lttng_poll_event events;
099e26bd
DG
1262 /*
1263 * Get allocated in this thread, enqueued to a global queue, dequeued and
1264 * freed in the manage apps thread.
1265 */
1266 struct ust_command *ust_cmd = NULL;
1d4b027a 1267
099e26bd 1268 DBG("[thread] Manage application registration started");
1d4b027a
DG
1269
1270 ret = lttcomm_listen_unix_sock(apps_sock);
1271 if (ret < 0) {
1272 goto error;
1273 }
1274
5eb91c98
DG
1275 /*
1276 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1277 * more will be added to this poll set.
1278 */
1279 ret = create_thread_poll_set(&events, 2);
1280 if (ret < 0) {
1281 goto error;
1282 }
273ea72c 1283
5eb91c98
DG
1284 /* Add the application registration socket */
1285 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1286 if (ret < 0) {
1287 goto error;
1288 }
273ea72c 1289
1d4b027a 1290 /* Notify all applications to register */
0fdd1e2c
DG
1291 ret = notify_ust_apps(1);
1292 if (ret < 0) {
1293 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1294 "Execution continues but there might be problem for already\n"
1295 "running applications that wishes to register.");
0fdd1e2c 1296 }
1d4b027a
DG
1297
1298 while (1) {
1299 DBG("Accepting application registration");
273ea72c 1300
5eb91c98
DG
1301 nb_fd = LTTNG_POLL_GETNB(&events);
1302
273ea72c 1303 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1304 ret = lttng_poll_wait(&events, -1);
273ea72c 1305 if (ret < 0) {
273ea72c
DG
1306 goto error;
1307 }
1308
5eb91c98
DG
1309 for (i = 0; i < nb_fd; i++) {
1310 /* Fetch once the poll data */
1311 revents = LTTNG_POLL_GETEV(&events, i);
1312 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1313
5eb91c98
DG
1314 /* Thread quit pipe has been closed. Killing thread. */
1315 ret = check_thread_quit_pipe(pollfd, revents);
1316 if (ret) {
90014c57
DG
1317 goto error;
1318 }
1d4b027a 1319
5eb91c98
DG
1320 /* Event on the registration socket */
1321 if (pollfd == apps_sock) {
1322 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1323 ERR("Register apps socket poll error");
1324 goto error;
1325 } else if (revents & LPOLLIN) {
1326 sock = lttcomm_accept_unix_sock(apps_sock);
1327 if (sock < 0) {
1328 goto error;
1329 }
099e26bd 1330
5eb91c98 1331 /* Create UST registration command for enqueuing */
ba7f0ae5 1332 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1333 if (ust_cmd == NULL) {
ba7f0ae5 1334 perror("ust command zmalloc");
5eb91c98
DG
1335 goto error;
1336 }
1d4b027a 1337
5eb91c98
DG
1338 /*
1339 * Using message-based transmissions to ensure we don't
1340 * have to deal with partially received messages.
1341 */
1342 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1343 sizeof(struct ust_register_msg));
1344 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1345 if (ret < 0) {
1346 perror("lttcomm_recv_unix_sock register apps");
1347 } else {
1348 ERR("Wrong size received on apps register");
1349 }
1350 free(ust_cmd);
1351 close(sock);
1352 continue;
1353 }
099e26bd 1354
5eb91c98 1355 ust_cmd->sock = sock;
099e26bd 1356
5eb91c98
DG
1357 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1358 " gid:%d sock:%d name:%s (version %d.%d)",
1359 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1360 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1361 ust_cmd->sock, ust_cmd->reg_msg.name,
1362 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1363
5eb91c98
DG
1364 /*
1365 * Lock free enqueue the registration request. The red pill
54d01ffb 1366 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1367 */
1368 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1369
1370 /*
1371 * Wake the registration queue futex. Implicit memory
1372 * barrier with the exchange in cds_wfq_enqueue.
1373 */
1374 futex_nto1_wake(&ust_cmd_queue.futex);
1375 }
1376 }
90014c57 1377 }
1d4b027a
DG
1378 }
1379
1380error:
0fdd1e2c
DG
1381 DBG("UST Registration thread dying");
1382
1383 /* Notify that the registration thread is gone */
1384 notify_ust_apps(0);
1385
1386 close(apps_sock);
1387 close(sock);
273ea72c 1388 unlink(apps_unix_sock_path);
0fdd1e2c 1389
5eb91c98
DG
1390 lttng_poll_clean(&events);
1391
1d4b027a
DG
1392 return NULL;
1393}
1394
8c0faa1d 1395/*
3bd1e081 1396 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1397 * exec or it will fails.
8c0faa1d 1398 */
3bd1e081 1399static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1400{
1401 int ret;
ee0b0061
DG
1402 struct timespec timeout;
1403
1404 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1405 timeout.tv_nsec = 0;
8c0faa1d
DG
1406
1407 /* Setup semaphore */
3bd1e081 1408 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1409 if (ret < 0) {
3bd1e081 1410 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1411 goto error;
1412 }
8c0faa1d 1413
3bd1e081
MD
1414 ret = pthread_create(&consumer_data->thread, NULL,
1415 thread_manage_consumer, consumer_data);
8c0faa1d 1416 if (ret != 0) {
3bd1e081 1417 PERROR("pthread_create consumer");
ee0b0061 1418 ret = -1;
8c0faa1d
DG
1419 goto error;
1420 }
1421
ee0b0061
DG
1422 /* Get time for sem_timedwait absolute timeout */
1423 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1424 if (ret < 0) {
3bd1e081 1425 PERROR("clock_gettime spawn consumer");
ee0b0061 1426 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1427 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1428 } else {
1429 /* Normal timeout if the gettime was successful */
1430 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1431 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1432 }
8c0faa1d 1433
ee0b0061
DG
1434 if (ret < 0) {
1435 if (errno == ETIMEDOUT) {
1436 /*
1437 * Call has timed out so we kill the kconsumerd_thread and return
1438 * an error.
1439 */
3bd1e081
MD
1440 ERR("The consumer thread was never ready. Killing it");
1441 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1442 if (ret < 0) {
3bd1e081 1443 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1444 }
1445 } else {
3bd1e081 1446 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1447 }
1448 goto error;
1449 }
1450
3bd1e081
MD
1451 pthread_mutex_lock(&consumer_data->pid_mutex);
1452 if (consumer_data->pid == 0) {
712ea556 1453 ERR("Kconsumerd did not start");
3bd1e081 1454 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1455 goto error;
1456 }
3bd1e081 1457 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1458
8c0faa1d
DG
1459 return 0;
1460
1461error:
1462 return ret;
1463}
1464
d9800920 1465/*
3bd1e081 1466 * Join consumer thread
d9800920 1467 */
3bd1e081 1468static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1469{
1470 void *status;
1471 int ret;
1472
3bd1e081
MD
1473 if (consumer_data->pid != 0) {
1474 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1475 if (ret) {
3bd1e081 1476 ERR("Error killing consumer daemon");
cf3af59e
MD
1477 return ret;
1478 }
3bd1e081 1479 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1480 } else {
1481 return 0;
1482 }
1483}
1484
8c0faa1d 1485/*
3bd1e081 1486 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1487 *
d063d709 1488 * Return pid if successful else -1.
8c0faa1d 1489 */
3bd1e081 1490static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1491{
1492 int ret;
1493 pid_t pid;
53086306 1494 const char *verbosity;
8c0faa1d 1495
3bd1e081 1496 DBG("Spawning consumerd");
c49dc785 1497
8c0faa1d
DG
1498 pid = fork();
1499 if (pid == 0) {
1500 /*
3bd1e081 1501 * Exec consumerd.
8c0faa1d 1502 */
3bd1e081 1503 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1504 verbosity = "--verbose";
1505 } else {
1506 verbosity = "--quiet";
1507 }
3bd1e081
MD
1508 switch (consumer_data->type) {
1509 case LTTNG_CONSUMER_KERNEL:
1510 execl(INSTALL_BIN_PATH "/lttng-consumerd",
7753dea8
MD
1511 "lttng-consumerd", verbosity, "-k",
1512 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1513 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1514 NULL);
3bd1e081 1515 break;
7753dea8
MD
1516 case LTTNG_CONSUMER64_UST:
1517 {
1518 char path[PATH_MAX];
1519
1520 snprintf(path, PATH_MAX, "%s/%s",
1521 consumerd64_bindir, consumerd64_prog);
1522 execl(path, verbosity, "-u",
1523 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1524 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1525 NULL);
3bd1e081 1526 break;
7753dea8
MD
1527 }
1528 case LTTNG_CONSUMER32_UST:
1529 {
1530 char path[PATH_MAX];
1531
1532 snprintf(path, PATH_MAX, "%s/%s",
1533 consumerd32_bindir, consumerd32_prog);
1534 execl(path, verbosity, "-u",
1535 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1536 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1537 NULL);
1538 break;
1539 }
3bd1e081
MD
1540 default:
1541 perror("unknown consumer type");
1542 exit(EXIT_FAILURE);
1543 }
8c0faa1d
DG
1544 if (errno != 0) {
1545 perror("kernel start consumer exec");
1546 }
1547 exit(EXIT_FAILURE);
1548 } else if (pid > 0) {
1549 ret = pid;
8c0faa1d 1550 } else {
3bd1e081 1551 perror("start consumer fork");
8c0faa1d 1552 ret = -errno;
8c0faa1d 1553 }
8c0faa1d
DG
1554 return ret;
1555}
1556
693bd40b 1557/*
3bd1e081 1558 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1559 */
3bd1e081 1560static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1561{
1562 int ret;
1563
3bd1e081
MD
1564 pthread_mutex_lock(&consumer_data->pid_mutex);
1565 if (consumer_data->pid != 0) {
1566 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1567 goto end;
1568 }
693bd40b 1569
3bd1e081 1570 ret = spawn_consumerd(consumer_data);
c49dc785 1571 if (ret < 0) {
3bd1e081
MD
1572 ERR("Spawning consumerd failed");
1573 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1574 goto error;
693bd40b 1575 }
c49dc785 1576
3bd1e081
MD
1577 /* Setting up the consumer_data pid */
1578 consumer_data->pid = ret;
48842b30 1579 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1580 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1581
3bd1e081
MD
1582 DBG2("Spawning consumer control thread");
1583 ret = spawn_consumer_thread(consumer_data);
693bd40b 1584 if (ret < 0) {
3bd1e081 1585 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1586 goto error;
1587 }
1588
c49dc785 1589end:
693bd40b
DG
1590 return 0;
1591
1592error:
1593 return ret;
1594}
1595
b73401da 1596/*
d063d709 1597 * modprobe_kernel_modules
b73401da
DG
1598 */
1599static int modprobe_kernel_modules(void)
1600{
ab147185 1601 int ret = 0, i;
b73401da
DG
1602 char modprobe[256];
1603
ab147185
MD
1604 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1605 ret = snprintf(modprobe, sizeof(modprobe),
1606 "/sbin/modprobe %s%s",
24b487b8 1607 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1608 kernel_modules_list[i].name);
b73401da
DG
1609 if (ret < 0) {
1610 perror("snprintf modprobe");
1611 goto error;
1612 }
ab147185 1613 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1614 ret = system(modprobe);
ab147185
MD
1615 if (ret == -1) {
1616 ERR("Unable to launch modprobe for module %s",
1617 kernel_modules_list[i].name);
1618 } else if (kernel_modules_list[i].required
d9800920 1619 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1620 ERR("Unable to load module %s",
1621 kernel_modules_list[i].name);
1622 } else {
1623 DBG("Modprobe successfully %s",
1624 kernel_modules_list[i].name);
1625 }
1626 }
1627
1628error:
1629 return ret;
1630}
1631
b73401da 1632/*
d063d709 1633 * mount_debugfs
b73401da
DG
1634 */
1635static int mount_debugfs(char *path)
1636{
1637 int ret;
1638 char *type = "debugfs";
1639
996b65c8 1640 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1641 if (ret < 0) {
7272acf5 1642 PERROR("Cannot create debugfs path");
b73401da
DG
1643 goto error;
1644 }
1645
1646 ret = mount(type, path, type, 0, NULL);
1647 if (ret < 0) {
7272acf5 1648 PERROR("Cannot mount debugfs");
b73401da
DG
1649 goto error;
1650 }
1651
1652 DBG("Mounted debugfs successfully at %s", path);
1653
1654error:
1655 return ret;
1656}
1657
8c0faa1d 1658/*
d063d709 1659 * Setup necessary data for kernel tracer action.
8c0faa1d 1660 */
f3ed775e 1661static void init_kernel_tracer(void)
8c0faa1d 1662{
b73401da
DG
1663 int ret;
1664 char *proc_mounts = "/proc/mounts";
1665 char line[256];
684d34d2 1666 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1667 FILE *fp;
1668
1669 /* Detect debugfs */
1670 fp = fopen(proc_mounts, "r");
1671 if (fp == NULL) {
1672 ERR("Unable to probe %s", proc_mounts);
1673 goto error;
1674 }
1675
1676 while (fgets(line, sizeof(line), fp) != NULL) {
1677 if (strstr(line, "debugfs") != NULL) {
1678 /* Remove first string */
1679 strtok(line, " ");
1680 /* Dup string here so we can reuse line later on */
1681 debugfs_path = strdup(strtok(NULL, " "));
1682 DBG("Got debugfs path : %s", debugfs_path);
1683 break;
1684 }
1685 }
1686
1687 fclose(fp);
1688
1689 /* Mount debugfs if needded */
1690 if (debugfs_path == NULL) {
1691 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1692 if (ret < 0) {
1693 perror("asprintf debugfs path");
1694 goto error;
1695 }
1696 ret = mount_debugfs(debugfs_path);
1697 if (ret < 0) {
7272acf5 1698 perror("Cannot mount debugfs");
b73401da
DG
1699 goto error;
1700 }
1701 }
1702
1703 /* Modprobe lttng kernel modules */
1704 ret = modprobe_kernel_modules();
1705 if (ret < 0) {
1706 goto error;
1707 }
1708
1709 /* Setup lttng kernel path */
1710 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1711 if (ret < 0) {
1712 perror("asprintf lttng path");
1713 goto error;
1714 }
1715
1716 /* Open debugfs lttng */
1717 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1718 if (kernel_tracer_fd < 0) {
b73401da
DG
1719 DBG("Failed to open %s", lttng_path);
1720 goto error;
8c0faa1d
DG
1721 }
1722
b73401da
DG
1723 free(lttng_path);
1724 free(debugfs_path);
f3ed775e 1725 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1726 return;
1727
1728error:
1729 if (lttng_path) {
1730 free(lttng_path);
1731 }
1732 if (debugfs_path) {
1733 free(debugfs_path);
1734 }
1735 WARN("No kernel tracer available");
1736 kernel_tracer_fd = 0;
1737 return;
f3ed775e 1738}
33a2b854 1739
f3ed775e 1740/*
54d01ffb 1741 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1742 */
54d01ffb 1743static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1744{
f40799e8 1745 int ret = 0;
8c0faa1d 1746
3bd1e081 1747 if (session->consumer_fds_sent == 0) {
d9800920 1748 /*
54d01ffb
DG
1749 * Assign default kernel consumer socket if no consumer assigned to the
1750 * kernel session. At this point, it's NOT suppose to be 0 but this is
1751 * an extra security check.
d9800920
DG
1752 */
1753 if (session->consumer_fd == 0) {
3bd1e081 1754 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1755 }
1756
2bdd86d4 1757 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1758 if (ret < 0) {
f3ed775e
DG
1759 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1760 goto error;
1761 }
1d4b027a 1762
3bd1e081 1763 session->consumer_fds_sent = 1;
f3ed775e 1764 }
1d4b027a
DG
1765
1766error:
1767 return ret;
8c0faa1d
DG
1768}
1769
0177d773
DG
1770/*
1771 * Create an UST session and add it to the session ust list.
1772 */
44d3bd01
DG
1773static int create_ust_session(struct ltt_session *session,
1774 struct lttng_domain *domain)
0177d773 1775{
44d3bd01 1776 int ret;
48842b30 1777 unsigned int uid;
13384287 1778 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1779
1780 switch (domain->type) {
48842b30 1781 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1782 break;
1783 default:
13384287 1784 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1785 goto error;
1786 }
0177d773
DG
1787
1788 DBG("Creating UST session");
1789
44e96653 1790 uid = session->uid;
48842b30 1791 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1792 if (lus == NULL) {
44d3bd01 1793 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1794 goto error;
1795 }
1796
48842b30 1797 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1798 geteuid(), allowed_group());
1799 if (ret < 0) {
1800 if (ret != -EEXIST) {
1801 ERR("Trace directory creation error");
44d3bd01 1802 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1803 goto error;
1804 }
1805 }
1806
f6a9efaa
DG
1807 /* The domain type dictate different actions on session creation */
1808 switch (domain->type) {
48842b30
DG
1809 case LTTNG_DOMAIN_UST:
1810 /* No ustctl for the global UST domain */
1811 break;
1812 default:
36dc12cc 1813 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1814 goto error;
0177d773 1815 }
f6a9efaa 1816 session->ust_session = lus;
44d3bd01
DG
1817
1818 return LTTCOMM_OK;
0177d773
DG
1819
1820error:
1821 free(lus);
1822 return ret;
1823}
1824
333f285e 1825/*
d063d709 1826 * Create a kernel tracer session then create the default channel.
333f285e 1827 */
f3ed775e 1828static int create_kernel_session(struct ltt_session *session)
333f285e 1829{
f3ed775e 1830 int ret;
f3ed775e
DG
1831
1832 DBG("Creating kernel session");
1833
1834 ret = kernel_create_session(session, kernel_tracer_fd);
1835 if (ret < 0) {
1836 ret = LTTCOMM_KERN_SESS_FAIL;
1837 goto error;
333f285e
DG
1838 }
1839
d9800920 1840 /* Set kernel consumer socket fd */
3bd1e081
MD
1841 if (kconsumer_data.cmd_sock) {
1842 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1843 }
1844
63053e7c
DG
1845 ret = mkdir_recursive(session->kernel_session->trace_path,
1846 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1847 if (ret < 0) {
996b65c8 1848 if (ret != -EEXIST) {
7a485870
DG
1849 ERR("Trace directory creation error");
1850 goto error;
1851 }
1852 }
1853
f3ed775e
DG
1854error:
1855 return ret;
333f285e
DG
1856}
1857
6c9cc2ab
DG
1858/*
1859 * Using the session list, filled a lttng_session array to send back to the
1860 * client for session listing.
1861 *
1862 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1863 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1864 */
1865static void list_lttng_sessions(struct lttng_session *sessions)
1866{
1867 int i = 0;
1868 struct ltt_session *session;
1869
1870 DBG("Getting all available session");
1871 /*
1872 * Iterate over session list and append data after the control struct in
1873 * the buffer.
1874 */
1875 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1876 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1877 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1878 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1879 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1880 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1881 i++;
1882 }
1883}
1884
9f19cc17
DG
1885/*
1886 * Fill lttng_channel array of all channels.
1887 */
b551a063 1888static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1889 struct lttng_channel *channels)
1890{
1891 int i = 0;
1892 struct ltt_kernel_channel *kchan;
1893
1894 DBG("Listing channels for session %s", session->name);
1895
b551a063
DG
1896 switch (domain) {
1897 case LTTNG_DOMAIN_KERNEL:
1898 /* Kernel channels */
1899 if (session->kernel_session != NULL) {
1900 cds_list_for_each_entry(kchan,
1901 &session->kernel_session->channel_list.head, list) {
1902 /* Copy lttng_channel struct to array */
1903 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1904 channels[i].enabled = kchan->enabled;
1905 i++;
1906 }
1907 }
1908 break;
1909 case LTTNG_DOMAIN_UST:
1910 {
1911 struct cds_lfht_iter iter;
1912 struct ltt_ust_channel *uchan;
1913
1914 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1915 &iter, uchan, node) {
1916 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1917 channels[i].attr.overwrite = uchan->attr.overwrite;
1918 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1919 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1920 channels[i].attr.switch_timer_interval =
1921 uchan->attr.switch_timer_interval;
1922 channels[i].attr.read_timer_interval =
1923 uchan->attr.read_timer_interval;
1924 channels[i].attr.output = uchan->attr.output;
aea829b3 1925 channels[i].enabled = uchan->enabled;
befe0905 1926 i++;
b551a063
DG
1927 }
1928 break;
1929 }
1930 default:
1931 break;
1932 }
1933}
1934
1935/*
1936 * Create a list of ust global domain events.
1937 */
1938static int list_lttng_ust_global_events(char *channel_name,
1939 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1940{
1941 int i = 0, ret = 0;
1942 unsigned int nb_event = 0;
1943 struct cds_lfht_iter iter;
1944 struct ltt_ust_channel *uchan;
1945 struct ltt_ust_event *uevent;
1946 struct lttng_event *tmp;
1947
1948 DBG("Listing UST global events for channel %s", channel_name);
1949
1950 rcu_read_lock();
1951
1952 /* Count events in all channels */
1953 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1954 nb_event += hashtable_get_count(uchan->events);
1955 }
1956
1957 if (nb_event == 0) {
1958 ret = nb_event;
1959 goto error;
1960 }
1961
1962 DBG3("Listing UST global %d events", nb_event);
1963
1964 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1965 if (tmp == NULL) {
1966 ret = -LTTCOMM_FATAL;
1967 goto error;
1968 }
1969
1970 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1971 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1972 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1973 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
37357452 1974 tmp[i].enabled = uevent->enabled;
b551a063
DG
1975 switch (uevent->attr.instrumentation) {
1976 case LTTNG_UST_TRACEPOINT:
1977 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1978 break;
1979 case LTTNG_UST_PROBE:
1980 tmp[i].type = LTTNG_EVENT_PROBE;
1981 break;
1982 case LTTNG_UST_FUNCTION:
1983 tmp[i].type = LTTNG_EVENT_FUNCTION;
1984 break;
1985 }
9f19cc17
DG
1986 i++;
1987 }
1988 }
1989
b551a063
DG
1990 ret = nb_event;
1991 *events = tmp;
1992
1993error:
1994 rcu_read_unlock();
1995 return ret;
9f19cc17
DG
1996}
1997
1998/*
b551a063 1999 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2000 */
b551a063
DG
2001static int list_lttng_kernel_events(char *channel_name,
2002 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2003{
b551a063
DG
2004 int i = 0, ret;
2005 unsigned int nb_event;
9f19cc17 2006 struct ltt_kernel_event *event;
b551a063
DG
2007 struct ltt_kernel_channel *kchan;
2008
2009 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2010 if (kchan == NULL) {
2011 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2012 goto error;
2013 }
2014
2015 nb_event = kchan->event_count;
9f19cc17
DG
2016
2017 DBG("Listing events for channel %s", kchan->channel->name);
2018
b551a063
DG
2019 if (nb_event == 0) {
2020 ret = nb_event;
2021 goto error;
2022 }
2023
2024 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2025 if (*events == NULL) {
2026 ret = LTTCOMM_FATAL;
2027 goto error;
2028 }
2029
9f19cc17
DG
2030 /* Kernel channels */
2031 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2032 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2033 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2034 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2035 switch (event->event->instrumentation) {
2036 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2037 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2038 break;
2039 case LTTNG_KERNEL_KPROBE:
2040 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2041 (*events)[i].type = LTTNG_EVENT_PROBE;
2042 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2043 sizeof(struct lttng_kernel_kprobe));
2044 break;
2045 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2046 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2047 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2048 sizeof(struct lttng_kernel_function));
2049 break;
0133c199 2050 case LTTNG_KERNEL_NOOP:
b551a063 2051 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2052 break;
a54bd42d 2053 case LTTNG_KERNEL_SYSCALL:
b551a063 2054 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2055 break;
7a3d1328
MD
2056 case LTTNG_KERNEL_ALL:
2057 assert(0);
2058 break;
9f19cc17
DG
2059 }
2060 i++;
2061 }
b551a063
DG
2062
2063 return nb_event;
2064
2065error:
2066 return ret;
9f19cc17
DG
2067}
2068
fac6795d 2069/*
54d01ffb 2070 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2071 */
54d01ffb
DG
2072static int cmd_disable_channel(struct ltt_session *session,
2073 int domain, char *channel_name)
fac6795d 2074{
54d01ffb 2075 int ret;
379473d2 2076
54d01ffb
DG
2077 switch (domain) {
2078 case LTTNG_DOMAIN_KERNEL:
2079 ret = channel_kernel_disable(session->kernel_session,
2080 channel_name);
2081 if (ret != LTTCOMM_OK) {
333f285e
DG
2082 goto error;
2083 }
54d01ffb
DG
2084
2085 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 2086 break;
44d3bd01
DG
2087 case LTTNG_DOMAIN_UST_PID:
2088 break;
d0254c7c 2089 default:
44d3bd01 2090 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 2091 goto error;
20fe2104
DG
2092 }
2093
54d01ffb 2094 ret = LTTCOMM_OK;
d65106b1 2095
54d01ffb
DG
2096error:
2097 return ret;
2098}
2099
56fff090
DG
2100/*
2101 * Copy channel from attributes and set it in the application channel list.
2102 */
f6a9efaa 2103/*
56fff090
DG
2104static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2105 struct lttng_channel *attr, struct ust_app *app)
2106{
2107 int ret;
2108 struct ltt_ust_channel *uchan, *new_chan;
2109
f6a9efaa 2110 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2111 if (uchan == NULL) {
2112 ret = LTTCOMM_FATAL;
2113 goto error;
2114 }
2115
2116 new_chan = trace_ust_create_channel(attr, usess->path);
2117 if (new_chan == NULL) {
2118 PERROR("malloc ltt_ust_channel");
2119 ret = LTTCOMM_FATAL;
2120 goto error;
2121 }
2122
2123 ret = channel_ust_copy(new_chan, uchan);
2124 if (ret < 0) {
2125 ret = LTTCOMM_FATAL;
2126 goto error;
2127 }
2128
56fff090
DG
2129error:
2130 return ret;
2131}
f6a9efaa 2132*/
56fff090 2133
54d01ffb
DG
2134/*
2135 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2136 */
44d3bd01 2137static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2138 int domain, struct lttng_channel *attr)
54d01ffb
DG
2139{
2140 int ret;
f6a9efaa
DG
2141 struct ltt_ust_session *usess = session->ust_session;
2142
5d56b5aa 2143 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2144
aea829b3 2145 switch (domain) {
44d3bd01
DG
2146 case LTTNG_DOMAIN_KERNEL:
2147 {
2148 struct ltt_kernel_channel *kchan;
54d01ffb 2149
44d3bd01
DG
2150 kchan = trace_kernel_get_channel_by_name(attr->name,
2151 session->kernel_session);
2152 if (kchan == NULL) {
2153 ret = channel_kernel_create(session->kernel_session,
2154 attr, kernel_poll_pipe[1]);
2155 } else {
2156 ret = channel_kernel_enable(session->kernel_session, kchan);
2157 }
2158
2159 if (ret != LTTCOMM_OK) {
2160 goto error;
2161 }
2162
2163 kernel_wait_quiescent(kernel_tracer_fd);
2164 break;
2165 }
f6a9efaa
DG
2166 case LTTNG_DOMAIN_UST:
2167 {
2168 struct ltt_ust_channel *uchan;
2169
48842b30 2170 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2171
48842b30 2172 /* Get channel in global UST domain HT */
f6a9efaa
DG
2173 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2174 attr->name);
2175 if (uchan == NULL) {
48842b30 2176 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2177 if (uchan == NULL) {
2178 ret = LTTCOMM_UST_CHAN_FAIL;
2179 goto error;
2180 }
d5cd1f34 2181
f6a9efaa
DG
2182 rcu_read_lock();
2183 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2184 rcu_read_unlock();
48842b30 2185 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
2186 } else {
2187 ret = LTTCOMM_UST_CHAN_EXIST;
2188 goto error;
2189 }
2190
421cb601 2191 /* Add channel to all registered applications */
5b4a0ec0 2192 ret = ust_app_create_channel_all(usess, uchan);
509cbaf8 2193 if (ret != 0) {
48842b30
DG
2194 goto error;
2195 }
f6a9efaa 2196
37357452
DG
2197 uchan->enabled = 1;
2198
f6a9efaa
DG
2199 break;
2200 }
44d3bd01
DG
2201 case LTTNG_DOMAIN_UST_PID:
2202 {
f6a9efaa 2203 /*
56fff090
DG
2204 int sock;
2205 struct ltt_ust_channel *uchan;
44d3bd01 2206 struct ltt_ust_session *usess;
56fff090 2207 struct ust_app *app;
44d3bd01
DG
2208
2209 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2210 domain->attr.pid);
2211 if (usess == NULL) {
2212 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2213 goto error;
2214 }
2215
56fff090 2216 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
2217 if (app == NULL) {
2218 ret = LTTCOMM_APP_NOT_FOUND;
2219 goto error;
2220 }
56fff090 2221 sock = app->sock;
44d3bd01
DG
2222
2223 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2224 if (uchan == NULL) {
56fff090 2225 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2226 } else {
56fff090 2227 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2228 }
2229
2230 if (ret != LTTCOMM_OK) {
2231 goto error;
2232 }
2233
56fff090
DG
2234 ret = copy_ust_channel_to_app(usess, attr, app);
2235 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2236 goto error;
2237 }
2238
44d3bd01
DG
2239 DBG("UST channel %s created for app sock %d with pid %d",
2240 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2241 */
2242 ret = LTTCOMM_NOT_IMPLEMENTED;
2243 goto error;
44d3bd01
DG
2244 }
2245 default:
2246 ret = LTTCOMM_UNKNOWN_DOMAIN;
2247 goto error;
54d01ffb
DG
2248 }
2249
2250 ret = LTTCOMM_OK;
2251
2252error:
2253 return ret;
2254}
2255
2256/*
2257 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2258 */
2259static int cmd_disable_event(struct ltt_session *session, int domain,
2260 char *channel_name, char *event_name)
2261{
2262 int ret;
54d01ffb
DG
2263
2264 switch (domain) {
2265 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2266 {
2267 struct ltt_kernel_channel *kchan;
2268
54d01ffb
DG
2269 kchan = trace_kernel_get_channel_by_name(channel_name,
2270 session->kernel_session);
2271 if (kchan == NULL) {
2272 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2273 goto error;
d65106b1
DG
2274 }
2275
7a3d1328 2276 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2277 if (ret != LTTCOMM_OK) {
2278 goto error;
2279 }
2280
2281 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2282 break;
2bdd86d4
MD
2283 }
2284 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
2286 case LTTNG_DOMAIN_UST_PID:
2287 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2288 default:
2bdd86d4 2289 /* TODO: Other UST domains */
54d01ffb
DG
2290 ret = LTTCOMM_NOT_IMPLEMENTED;
2291 goto error;
d65106b1 2292 }
26cc6b4e 2293
54d01ffb
DG
2294 ret = LTTCOMM_OK;
2295
2296error:
2297 return ret;
2298}
2299
2300/*
2301 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2302 */
2303static int cmd_disable_event_all(struct ltt_session *session, int domain,
2304 char *channel_name)
2305{
2306 int ret;
2307 struct ltt_kernel_channel *kchan;
2308
2309 switch (domain) {
2310 case LTTNG_DOMAIN_KERNEL:
2311 kchan = trace_kernel_get_channel_by_name(channel_name,
2312 session->kernel_session);
2313 if (kchan == NULL) {
2314 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2315 goto error;
26cc6b4e
DG
2316 }
2317
54d01ffb
DG
2318 ret = event_kernel_disable_all(session->kernel_session, kchan);
2319 if (ret != LTTCOMM_OK) {
0b97ec54 2320 goto error;
26cc6b4e
DG
2321 }
2322
54d01ffb 2323 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2324 break;
54d01ffb
DG
2325 default:
2326 /* TODO: Userspace tracing */
2327 ret = LTTCOMM_NOT_IMPLEMENTED;
2328 goto error;
26cc6b4e 2329 }
e953ef25 2330
54d01ffb 2331 ret = LTTCOMM_OK;
e953ef25 2332
54d01ffb
DG
2333error:
2334 return ret;
2335}
f5177a38 2336
54d01ffb
DG
2337/*
2338 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2339 */
2340static int cmd_add_context(struct ltt_session *session, int domain,
2341 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2342{
2343 int ret;
f5177a38 2344
54d01ffb
DG
2345 switch (domain) {
2346 case LTTNG_DOMAIN_KERNEL:
2347 /* Add kernel context to kernel tracer */
2348 ret = context_kernel_add(session->kernel_session, ctx,
2349 event_name, channel_name);
2350 if (ret != LTTCOMM_OK) {
f5177a38 2351 goto error;
e953ef25 2352 }
2bdd86d4
MD
2353 break;
2354 case LTTNG_DOMAIN_UST:
2355 {
48842b30
DG
2356 /*
2357 struct ltt_ust_session *usess;
e953ef25 2358
48842b30
DG
2359 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2360 ret = context_ust_add(usess, ctx,
2361 event_name, channel_name, domain);
2bdd86d4
MD
2362 if (ret != LTTCOMM_OK) {
2363 goto error;
2364 }
2365 }
e953ef25 2366 break;
48842b30 2367 */
2bdd86d4 2368 }
54d01ffb 2369 default:
2bdd86d4 2370 /* TODO: UST other domains */
54d01ffb
DG
2371 ret = LTTCOMM_NOT_IMPLEMENTED;
2372 goto error;
e953ef25 2373 }
950131af 2374
54d01ffb 2375 ret = LTTCOMM_OK;
950131af 2376
54d01ffb
DG
2377error:
2378 return ret;
2379}
2380
2381/*
2382 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2383 */
2384static int cmd_enable_event(struct ltt_session *session, int domain,
2385 char *channel_name, struct lttng_event *event)
2386{
2387 int ret;
f6cd6b0f 2388 struct lttng_channel *attr;
48842b30 2389 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2390
2391 switch (domain) {
2392 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2393 {
2394 struct ltt_kernel_channel *kchan;
2395
54d01ffb
DG
2396 kchan = trace_kernel_get_channel_by_name(channel_name,
2397 session->kernel_session);
2398 if (kchan == NULL) {
f6cd6b0f
DG
2399 attr = channel_new_default_attr(domain);
2400 if (attr == NULL) {
2401 ret = LTTCOMM_FATAL;
2402 goto error;
2403 }
2404 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2405
54d01ffb 2406 /* This call will notify the kernel thread */
44d3bd01 2407 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2408 attr, kernel_poll_pipe[1]);
54d01ffb 2409 if (ret != LTTCOMM_OK) {
f5177a38
DG
2410 goto error;
2411 }
54d01ffb 2412 }
950131af 2413
54d01ffb
DG
2414 /* Get the newly created kernel channel pointer */
2415 kchan = trace_kernel_get_channel_by_name(channel_name,
2416 session->kernel_session);
2417 if (kchan == NULL) {
2418 /* This sould not happen... */
2419 ret = LTTCOMM_FATAL;
2420 goto error;
2421 }
f5177a38 2422
48842b30
DG
2423 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2424 event);
54d01ffb 2425 if (ret != LTTCOMM_OK) {
f5177a38 2426 goto error;
950131af
DG
2427 }
2428
54d01ffb 2429 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2430 break;
2bdd86d4
MD
2431 }
2432 case LTTNG_DOMAIN_UST:
2433 {
48842b30
DG
2434 struct ltt_ust_channel *uchan;
2435 struct ltt_ust_event *uevent;
aea829b3 2436 struct lttng_channel *attr;
2bdd86d4 2437
48842b30
DG
2438 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2439 channel_name);
2440 if (uchan == NULL) {
aea829b3
DG
2441 /* Create default channel */
2442 attr = channel_new_default_attr(domain);
2443 if (attr == NULL) {
2444 ret = LTTCOMM_FATAL;
2445 goto error;
2446 }
2447
2448 /* Use the internal command enable channel */
2449 ret = cmd_enable_channel(session, domain, attr);
2450 if (ret < 0) {
2451 goto error;
2452 }
2453
2454 free(attr);
2455
2456 /* Get the newly created channel reference back */
2457 uchan = trace_ust_find_channel_by_name(
2458 usess->domain_global.channels, channel_name);
2459 if (uchan == NULL) {
2460 /* Something is really wrong */
2461 ret = LTTCOMM_FATAL;
2462 goto error;
2463 }
48842b30 2464 }
2bdd86d4 2465
48842b30
DG
2466 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2467 if (uevent == NULL) {
2468 uevent = trace_ust_create_event(event);
2469 if (uevent == NULL) {
2bdd86d4
MD
2470 ret = LTTCOMM_FATAL;
2471 goto error;
2472 }
d5cd1f34 2473
48842b30 2474 }
2bdd86d4 2475
5b4a0ec0 2476 ret = ust_app_create_event_all(usess, uchan, uevent);
48842b30
DG
2477 if (ret < 0) {
2478 ret = LTTCOMM_UST_ENABLE_FAIL;
2479 goto error;
2bdd86d4 2480 }
487cf67c 2481
d5cd1f34 2482 /* Add ltt ust event to channel */
487cf67c
DG
2483 rcu_read_lock();
2484 hashtable_add_unique(uchan->events, &uevent->node);
2485 rcu_read_unlock();
d5cd1f34 2486
37357452
DG
2487 uevent->enabled = 1;
2488
d5cd1f34
DG
2489 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2490 uchan->name);
2bdd86d4
MD
2491 break;
2492 }
2493 case LTTNG_DOMAIN_UST_EXEC_NAME:
2494 case LTTNG_DOMAIN_UST_PID:
2495 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2496 default:
54d01ffb
DG
2497 ret = LTTCOMM_NOT_IMPLEMENTED;
2498 goto error;
950131af 2499 }
d36b8583 2500
54d01ffb 2501 ret = LTTCOMM_OK;
d36b8583 2502
54d01ffb
DG
2503error:
2504 return ret;
2505}
7d29a247 2506
54d01ffb
DG
2507/*
2508 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2509 */
2510static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2511 char *channel_name, int event_type)
54d01ffb
DG
2512{
2513 int ret;
2514 struct ltt_kernel_channel *kchan;
7d29a247 2515
54d01ffb
DG
2516 switch (domain) {
2517 case LTTNG_DOMAIN_KERNEL:
2518 kchan = trace_kernel_get_channel_by_name(channel_name,
2519 session->kernel_session);
2520 if (kchan == NULL) {
2521 /* This call will notify the kernel thread */
44d3bd01
DG
2522 ret = channel_kernel_create(session->kernel_session, NULL,
2523 kernel_poll_pipe[1]);
54d01ffb
DG
2524 if (ret != LTTCOMM_OK) {
2525 goto error;
d36b8583 2526 }
54d01ffb 2527 }
0d0c377a 2528
54d01ffb
DG
2529 /* Get the newly created kernel channel pointer */
2530 kchan = trace_kernel_get_channel_by_name(channel_name,
2531 session->kernel_session);
2532 if (kchan == NULL) {
2533 /* This sould not happen... */
2534 ret = LTTCOMM_FATAL;
2535 goto error;
2536 }
0fdd1e2c 2537
7a3d1328
MD
2538 switch (event_type) {
2539 case LTTNG_KERNEL_SYSCALL:
2540 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2541 kchan, kernel_tracer_fd);
7a3d1328
MD
2542 break;
2543 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2544 /*
7a3d1328
MD
2545 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2546 * events already registered to the channel.
8c9ae521 2547 */
7a3d1328
MD
2548 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2549 kchan, kernel_tracer_fd);
2550 break;
2551 case LTTNG_KERNEL_ALL:
2552 /* Enable syscalls and tracepoints */
8c9ae521
DG
2553 ret = event_kernel_enable_all(session->kernel_session,
2554 kchan, kernel_tracer_fd);
7a3d1328
MD
2555 break;
2556 default:
2557 ret = LTTCOMM_KERN_ENABLE_FAIL;
2558 goto error;
8c9ae521 2559 }
54d01ffb 2560 if (ret != LTTCOMM_OK) {
0d0c377a 2561 goto error;
d36b8583
DG
2562 }
2563
54d01ffb 2564 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2565 break;
54d01ffb
DG
2566 default:
2567 /* TODO: Userspace tracing */
2568 ret = LTTCOMM_NOT_IMPLEMENTED;
2569 goto error;
d36b8583 2570 }
f3ed775e 2571
54d01ffb
DG
2572 ret = LTTCOMM_OK;
2573
2574error:
2575 return ret;
2576}
2577
2578/*
2579 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2580 */
2581static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2582{
2583 int ret;
2584 ssize_t nb_events = 0;
2585
2586 switch (domain) {
2587 case LTTNG_DOMAIN_KERNEL:
2588 nb_events = kernel_list_events(kernel_tracer_fd, events);
2589 if (nb_events < 0) {
2590 ret = LTTCOMM_KERN_LIST_FAIL;
2591 goto error;
894be886 2592 }
54d01ffb 2593 break;
b551a063
DG
2594 case LTTNG_DOMAIN_UST:
2595 nb_events = ust_app_list_events(events);
2596 if (nb_events < 0) {
2597 ret = LTTCOMM_UST_LIST_FAIL;
2598 goto error;
2599 }
2600 break;
54d01ffb 2601 default:
54d01ffb
DG
2602 ret = LTTCOMM_NOT_IMPLEMENTED;
2603 goto error;
2604 }
894be886 2605
54d01ffb 2606 return nb_events;
7d29a247 2607
54d01ffb
DG
2608error:
2609 /* Return negative value to differentiate return code */
2610 return -ret;
2611}
b389abbe 2612
54d01ffb
DG
2613/*
2614 * Command LTTNG_START_TRACE processed by the client thread.
2615 */
2616static int cmd_start_trace(struct ltt_session *session)
2617{
2618 int ret;
54d01ffb 2619 struct ltt_kernel_session *ksession;
b9d9b220 2620 struct ltt_ust_session *usess;
b389abbe 2621
54d01ffb
DG
2622 /* Short cut */
2623 ksession = session->kernel_session;
b9d9b220 2624 usess = session->ust_session;
5eb91c98 2625
464dd62d
MD
2626 if (session->enabled)
2627 return LTTCOMM_UST_START_FAIL;
2628 session->enabled = 1;
2629
54d01ffb
DG
2630 /* Kernel tracing */
2631 if (ksession != NULL) {
2bdd86d4
MD
2632 struct ltt_kernel_channel *kchan;
2633
54d01ffb
DG
2634 /* Open kernel metadata */
2635 if (ksession->metadata == NULL) {
2636 ret = kernel_open_metadata(ksession, ksession->trace_path);
2637 if (ret < 0) {
2638 ret = LTTCOMM_KERN_META_FAIL;
2639 goto error;
b389abbe 2640 }
54d01ffb 2641 }
7d29a247 2642
54d01ffb
DG
2643 /* Open kernel metadata stream */
2644 if (ksession->metadata_stream_fd == 0) {
2645 ret = kernel_open_metadata_stream(ksession);
2646 if (ret < 0) {
2647 ERR("Kernel create metadata stream failed");
2648 ret = LTTCOMM_KERN_STREAM_FAIL;
2649 goto error;
2650 }
2651 }
2652
2653 /* For each channel */
2654 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2655 if (kchan->stream_count == 0) {
2656 ret = kernel_open_channel_stream(kchan);
2657 if (ret < 0) {
2658 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2659 goto error;
2660 }
54d01ffb
DG
2661 /* Update the stream global counter */
2662 ksession->stream_count_global += ret;
7d29a247 2663 }
54d01ffb
DG
2664 }
2665
2666 /* Setup kernel consumer socket and send fds to it */
2667 ret = init_kernel_tracing(ksession);
2668 if (ret < 0) {
2669 ret = LTTCOMM_KERN_START_FAIL;
2670 goto error;
2671 }
2672
2673 /* This start the kernel tracing */
2674 ret = kernel_start_session(ksession);
2675 if (ret < 0) {
2676 ret = LTTCOMM_KERN_START_FAIL;
2677 goto error;
2678 }
2679
2680 /* Quiescent wait after starting trace */
2681 kernel_wait_quiescent(kernel_tracer_fd);
2682 }
2683
36dc12cc 2684 /* Flag session that trace should start automatically */
b9d9b220
DG
2685 if (usess) {
2686 usess->start_trace = 1;
36dc12cc 2687
b9d9b220
DG
2688 ret = ust_app_start_trace_all(usess);
2689 if (ret < 0) {
2690 ret = LTTCOMM_UST_START_FAIL;
2691 goto error;
2692 }
2bdd86d4 2693 }
54d01ffb
DG
2694
2695 ret = LTTCOMM_OK;
2696
2697error:
2698 return ret;
2699}
2700
2701/*
2702 * Command LTTNG_STOP_TRACE processed by the client thread.
2703 */
2704static int cmd_stop_trace(struct ltt_session *session)
2705{
2706 int ret;
2707 struct ltt_kernel_channel *kchan;
2708 struct ltt_kernel_session *ksession;
8be98f9a 2709 struct ltt_ust_session *usess;
54d01ffb
DG
2710
2711 /* Short cut */
2712 ksession = session->kernel_session;
8be98f9a 2713 usess = session->ust_session;
54d01ffb 2714
464dd62d
MD
2715 if (!session->enabled)
2716 return LTTCOMM_UST_START_FAIL;
2717 session->enabled = 0;
2718
54d01ffb
DG
2719 /* Kernel tracer */
2720 if (ksession != NULL) {
2721 DBG("Stop kernel tracing");
2722
2723 /* Flush all buffers before stopping */
2724 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2725 if (ret < 0) {
2726 ERR("Kernel metadata flush failed");
2727 }
f34daff7 2728
54d01ffb
DG
2729 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2730 ret = kernel_flush_buffer(kchan);
0d0c377a 2731 if (ret < 0) {
54d01ffb 2732 ERR("Kernel flush buffer error");
7d29a247 2733 }
54d01ffb 2734 }
19e70852 2735
54d01ffb
DG
2736 ret = kernel_stop_session(ksession);
2737 if (ret < 0) {
2738 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2739 goto error;
f3ed775e 2740 }
54d01ffb
DG
2741
2742 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2743 }
54d01ffb 2744
8be98f9a
MD
2745 if (usess) {
2746 usess->start_trace = 0;
2bdd86d4 2747
8be98f9a 2748 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2749 if (ret < 0) {
8be98f9a 2750 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2751 goto error;
2752 }
2bdd86d4 2753 }
54d01ffb
DG
2754
2755 ret = LTTCOMM_OK;
2756
2757error:
2758 return ret;
2759}
2760
2761/*
2762 * Command LTTNG_CREATE_SESSION processed by the client thread.
2763 */
2764static int cmd_create_session(char *name, char *path)
2765{
2766 int ret;
2767
2768 ret = session_create(name, path);
2769 if (ret != LTTCOMM_OK) {
2770 goto error;
2771 }
2772
2773 ret = LTTCOMM_OK;
2774
2775error:
2776 return ret;
2777}
2778
2779/*
2780 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2781 */
2782static int cmd_destroy_session(struct ltt_session *session, char *name)
2783{
2784 int ret;
2785
2786 /* Clean kernel session teardown */
2787 teardown_kernel_session(session);
84cd17c6
MD
2788 /* UST session teardown */
2789 teardown_ust_session(session);
54d01ffb
DG
2790
2791 /*
2792 * Must notify the kernel thread here to update it's poll setin order
2793 * to remove the channel(s)' fd just destroyed.
2794 */
2795 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2796 if (ret < 0) {
2797 perror("write kernel poll pipe");
2798 }
2799
271933a4 2800 ret = session_destroy(session);
54d01ffb
DG
2801
2802 return ret;
2803}
2804
2805/*
2806 * Command LTTNG_CALIBRATE processed by the client thread.
2807 */
2808static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2809{
2810 int ret;
2811
2812 switch (domain) {
2813 case LTTNG_DOMAIN_KERNEL:
33a2b854 2814 {
54d01ffb 2815 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2816
54d01ffb
DG
2817 kcalibrate.type = calibrate->type;
2818 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2819 if (ret < 0) {
54d01ffb
DG
2820 ret = LTTCOMM_KERN_ENABLE_FAIL;
2821 goto error;
33a2b854 2822 }
54d01ffb
DG
2823 break;
2824 }
2825 default:
2826 /* TODO: Userspace tracing */
2827 ret = LTTCOMM_NOT_IMPLEMENTED;
2828 goto error;
2829 }
33a2b854 2830
54d01ffb 2831 ret = LTTCOMM_OK;
33a2b854 2832
54d01ffb
DG
2833error:
2834 return ret;
2835}
7d29a247 2836
54d01ffb
DG
2837/*
2838 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2839 */
2840static int cmd_register_consumer(struct ltt_session *session, int domain,
2841 char *sock_path)
2842{
2843 int ret, sock;
b389abbe 2844
54d01ffb
DG
2845 switch (domain) {
2846 case LTTNG_DOMAIN_KERNEL:
2847 /* Can't register a consumer if there is already one */
2848 if (session->kernel_session->consumer_fd != 0) {
2849 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2850 goto error;
2851 }
2852
2853 sock = lttcomm_connect_unix_sock(sock_path);
2854 if (sock < 0) {
2855 ret = LTTCOMM_CONNECT_FAIL;
2856 goto error;
2857 }
2858
2859 session->kernel_session->consumer_fd = sock;
2860 break;
2861 default:
2862 /* TODO: Userspace tracing */
2863 ret = LTTCOMM_NOT_IMPLEMENTED;
2864 goto error;
2865 }
2866
2867 ret = LTTCOMM_OK;
2868
2869error:
2870 return ret;
2871}
2872
2873/*
2874 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2875 */
2876static ssize_t cmd_list_domains(struct ltt_session *session,
2877 struct lttng_domain **domains)
2878{
b551a063 2879 int ret, index = 0;
54d01ffb
DG
2880 ssize_t nb_dom = 0;
2881
2882 if (session->kernel_session != NULL) {
b551a063 2883 DBG3("Listing domains found kernel domain");
54d01ffb
DG
2884 nb_dom++;
2885 }
2886
b551a063
DG
2887 if (session->ust_session != NULL) {
2888 DBG3("Listing domains found UST global domain");
2889 nb_dom++;
2890 }
54d01ffb 2891
b551a063 2892 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
2893 if (*domains == NULL) {
2894 ret = -LTTCOMM_FATAL;
2895 goto error;
2896 }
2897
b551a063
DG
2898 if (session->kernel_session != NULL) {
2899 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2900 index++;
2901 }
2902
2903 if (session->ust_session != NULL) {
2904 (*domains)[index].type = LTTNG_DOMAIN_UST;
2905 index++;
2906 }
54d01ffb 2907
54d01ffb
DG
2908 return nb_dom;
2909
2910error:
2911 return ret;
2912}
2913
2914/*
2915 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2916 */
b551a063 2917static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
2918 struct lttng_channel **channels)
2919{
2920 int ret;
2921 ssize_t nb_chan = 0;
2922
b551a063
DG
2923 switch (domain) {
2924 case LTTNG_DOMAIN_KERNEL:
2925 if (session->kernel_session != NULL) {
2926 nb_chan = session->kernel_session->channel_count;
2927 }
0df502fd 2928 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
2929 break;
2930 case LTTNG_DOMAIN_UST:
2931 if (session->ust_session != NULL) {
2932 nb_chan = hashtable_get_count(
2933 session->ust_session->domain_global.channels);
2934 }
0df502fd 2935 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
2936 break;
2937 default:
2938 *channels = NULL;
2939 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2940 goto error;
2941 }
2942
b551a063
DG
2943 if (nb_chan > 0) {
2944 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2945 if (*channels == NULL) {
2946 ret = -LTTCOMM_FATAL;
2947 goto error;
2948 }
54d01ffb 2949
b551a063
DG
2950 list_lttng_channels(domain, session, *channels);
2951 } else {
2952 *channels = NULL;
2953 }
2bdd86d4 2954
54d01ffb
DG
2955 return nb_chan;
2956
2957error:
2958 return ret;
2959}
2960
2961/*
2962 * Command LTTNG_LIST_EVENTS processed by the client thread.
2963 */
b551a063 2964static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
2965 char *channel_name, struct lttng_event **events)
2966{
b551a063 2967 int ret = 0;
54d01ffb 2968 ssize_t nb_event = 0;
54d01ffb 2969
b551a063
DG
2970 switch (domain) {
2971 case LTTNG_DOMAIN_KERNEL:
2972 if (session->kernel_session != NULL) {
2973 nb_event = list_lttng_kernel_events(channel_name,
2974 session->kernel_session, events);
54d01ffb 2975 }
b551a063
DG
2976 break;
2977 case LTTNG_DOMAIN_UST:
2978 {
2979 if (session->ust_session != NULL) {
2980 nb_event = list_lttng_ust_global_events(channel_name,
2981 &session->ust_session->domain_global, events);
2982 }
2983 break;
54d01ffb 2984 }
b551a063
DG
2985 default:
2986 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2987 goto error;
2988 }
2989
b551a063 2990 ret = nb_event;
54d01ffb
DG
2991
2992error:
2993 return ret;
2994}
2995
2996/*
2997 * Process the command requested by the lttng client within the command
2998 * context structure. This function make sure that the return structure (llm)
2999 * is set and ready for transmission before returning.
3000 *
3001 * Return any error encountered or 0 for success.
3002 */
3003static int process_client_msg(struct command_ctx *cmd_ctx)
3004{
3005 int ret = LTTCOMM_OK;
44d3bd01 3006 int need_tracing_session = 1;
54d01ffb
DG
3007
3008 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3009
3010 /*
3011 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3012 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3013 * command.
3014 */
3015 switch(cmd_ctx->lsm->cmd_type) {
3016 case LTTNG_LIST_SESSIONS:
3017 case LTTNG_LIST_TRACEPOINTS:
3018 case LTTNG_LIST_DOMAINS:
3019 case LTTNG_LIST_CHANNELS:
3020 case LTTNG_LIST_EVENTS:
3021 break;
3022 default:
3023 /* Setup lttng message with no payload */
3024 ret = setup_lttng_msg(cmd_ctx, 0);
3025 if (ret < 0) {
3026 /* This label does not try to unlock the session */
3027 goto init_setup_error;
3028 }
3029 }
3030
3031 /* Commands that DO NOT need a session. */
3032 switch (cmd_ctx->lsm->cmd_type) {
3033 case LTTNG_CALIBRATE:
3034 case LTTNG_CREATE_SESSION:
3035 case LTTNG_LIST_SESSIONS:
3036 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3037 need_tracing_session = 0;
54d01ffb
DG
3038 break;
3039 default:
3040 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3041 session_lock_list();
54d01ffb 3042 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3043 session_unlock_list();
54d01ffb
DG
3044 if (cmd_ctx->session == NULL) {
3045 if (cmd_ctx->lsm->session.name != NULL) {
3046 ret = LTTCOMM_SESS_NOT_FOUND;
3047 } else {
3048 /* If no session name specified */
3049 ret = LTTCOMM_SELECT_SESS;
3050 }
3051 goto error;
3052 } else {
3053 /* Acquire lock for the session */
3054 session_lock(cmd_ctx->session);
3055 }
3056 break;
3057 }
b389abbe 3058
54d01ffb
DG
3059 /*
3060 * Check domain type for specific "pre-action".
3061 */
3062 switch (cmd_ctx->lsm->domain.type) {
3063 case LTTNG_DOMAIN_KERNEL:
3064 /* Kernel tracer check */
3065 if (kernel_tracer_fd == 0) {
3066 /* Basically, load kernel tracer modules */
3067 init_kernel_tracer();
3068 if (kernel_tracer_fd == 0) {
3069 ret = LTTCOMM_KERN_NA;
3070 goto error;
3071 }
3072 }
5eb91c98 3073
54d01ffb 3074 /* Need a session for kernel command */
44d3bd01 3075 if (need_tracing_session) {
54d01ffb
DG
3076 if (cmd_ctx->session->kernel_session == NULL) {
3077 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3078 if (ret < 0) {
54d01ffb 3079 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3080 goto error;
3081 }
b389abbe 3082 }
7d29a247 3083
54d01ffb 3084 /* Start the kernel consumer daemon */
3bd1e081
MD
3085 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3086 if (kconsumer_data.pid == 0 &&
54d01ffb 3087 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3088 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3089 ret = start_consumerd(&kconsumer_data);
7d29a247 3090 if (ret < 0) {
54d01ffb
DG
3091 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3092 goto error;
950131af 3093 }
3ff2ecac
MD
3094 } else {
3095 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3096 }
0d0c377a 3097 }
54d01ffb 3098 break;
2bdd86d4 3099 case LTTNG_DOMAIN_UST:
44d3bd01 3100 {
44d3bd01 3101 if (need_tracing_session) {
f6a9efaa 3102 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3103 ret = create_ust_session(cmd_ctx->session,
3104 &cmd_ctx->lsm->domain);
3105 if (ret != LTTCOMM_OK) {
3106 goto error;
3107 }
3108 }
7753dea8
MD
3109 /* Start the UST consumer daemons */
3110 /* 64-bit */
3111 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3112 if (consumerd64_bindir[0] != '\0' &&
3113 ustconsumer64_data.pid == 0 &&
2bdd86d4 3114 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3115 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3116 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3117 if (ret < 0) {
7753dea8
MD
3118 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3119 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3120 goto error;
3121 }
48842b30 3122
7753dea8 3123 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3124 } else {
7753dea8
MD
3125 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3126 }
3127 /* 32-bit */
3128 if (consumerd32_bindir[0] != '\0' &&
3129 ustconsumer32_data.pid == 0 &&
3130 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3131 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3132 ret = start_consumerd(&ustconsumer32_data);
3133 if (ret < 0) {
3134 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3135 ust_consumerd32_fd = -EINVAL;
3136 goto error;
3137 }
3138 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3139 } else {
3140 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3141 }
44d3bd01
DG
3142 }
3143 break;
48842b30 3144 }
54d01ffb 3145 default:
54d01ffb
DG
3146 break;
3147 }
33a2b854 3148
54d01ffb
DG
3149 /* Process by command type */
3150 switch (cmd_ctx->lsm->cmd_type) {
3151 case LTTNG_ADD_CONTEXT:
3152 {
3153 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3154 cmd_ctx->lsm->u.context.channel_name,
3155 cmd_ctx->lsm->u.context.event_name,
3156 &cmd_ctx->lsm->u.context.ctx);
3157 break;
3158 }
3159 case LTTNG_DISABLE_CHANNEL:
3160 {
3161 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3162 cmd_ctx->lsm->u.disable.channel_name);
3163 break;
3164 }
3165 case LTTNG_DISABLE_EVENT:
3166 {
3167 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3168 cmd_ctx->lsm->u.disable.channel_name,
3169 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3170 ret = LTTCOMM_OK;
3171 break;
3172 }
54d01ffb
DG
3173 case LTTNG_DISABLE_ALL_EVENT:
3174 {
2bdd86d4 3175 DBG("Disabling all events");
54d01ffb
DG
3176
3177 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3178 cmd_ctx->lsm->u.disable.channel_name);
3179 break;
3180 }
3181 case LTTNG_ENABLE_CHANNEL:
3182 {
aea829b3 3183 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG
3184 &cmd_ctx->lsm->u.channel.chan);
3185 break;
3186 }
3187 case LTTNG_ENABLE_EVENT:
3188 {
3189 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3190 cmd_ctx->lsm->u.enable.channel_name,
3191 &cmd_ctx->lsm->u.enable.event);
3192 break;
3193 }
3194 case LTTNG_ENABLE_ALL_EVENT:
3195 {
2bdd86d4 3196 DBG("Enabling all events");
54d01ffb
DG
3197
3198 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3199 cmd_ctx->lsm->u.enable.channel_name,
3200 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3201 break;
3202 }
052da939 3203 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3204 {
9f19cc17 3205 struct lttng_event *events;
54d01ffb 3206 ssize_t nb_events;
052da939 3207
54d01ffb
DG
3208 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3209 if (nb_events < 0) {
3210 ret = -nb_events;
3211 goto error;
2ef84c95
DG
3212 }
3213
3214 /*
3215 * Setup lttng message with payload size set to the event list size in
3216 * bytes and then copy list into the llm payload.
3217 */
052da939 3218 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3219 if (ret < 0) {
052da939 3220 free(events);
2ef84c95
DG
3221 goto setup_error;
3222 }
3223
3224 /* Copy event list into message payload */
9f19cc17 3225 memcpy(cmd_ctx->llm->payload, events,
052da939 3226 sizeof(struct lttng_event) * nb_events);
2ef84c95 3227
9f19cc17 3228 free(events);
2ef84c95
DG
3229
3230 ret = LTTCOMM_OK;
3231 break;
3232 }
f3ed775e 3233 case LTTNG_START_TRACE:
8c0faa1d 3234 {
54d01ffb 3235 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3236 break;
3237 }
f3ed775e 3238 case LTTNG_STOP_TRACE:
8c0faa1d 3239 {
54d01ffb 3240 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3241 break;
3242 }
5e16da05
MD
3243 case LTTNG_CREATE_SESSION:
3244 {
54d01ffb
DG
3245 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3246 cmd_ctx->lsm->session.path);
5e16da05
MD
3247 break;
3248 }
3249 case LTTNG_DESTROY_SESSION:
3250 {
54d01ffb
DG
3251 ret = cmd_destroy_session(cmd_ctx->session,
3252 cmd_ctx->lsm->session.name);
5461b305 3253 break;
5e16da05 3254 }
9f19cc17 3255 case LTTNG_LIST_DOMAINS:
5e16da05 3256 {
54d01ffb
DG
3257 ssize_t nb_dom;
3258 struct lttng_domain *domains;
5461b305 3259
54d01ffb
DG
3260 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3261 if (nb_dom < 0) {
3262 ret = -nb_dom;
3263 goto error;
ce3d728c 3264 }
520ff687 3265
54d01ffb 3266 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3267 if (ret < 0) {
3268 goto setup_error;
520ff687 3269 }
57167058 3270
54d01ffb
DG
3271 /* Copy event list into message payload */
3272 memcpy(cmd_ctx->llm->payload, domains,
3273 nb_dom * sizeof(struct lttng_domain));
3274
3275 free(domains);
5e16da05 3276
5461b305 3277 ret = LTTCOMM_OK;
5e16da05
MD
3278 break;
3279 }
9f19cc17 3280 case LTTNG_LIST_CHANNELS:
5e16da05 3281 {
54d01ffb
DG
3282 size_t nb_chan;
3283 struct lttng_channel *channels;
3284
b551a063
DG
3285 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3286 cmd_ctx->session, &channels);
54d01ffb
DG
3287 if (nb_chan < 0) {
3288 ret = -nb_chan;
3289 goto error;
5461b305 3290 }
ca95a216 3291
54d01ffb 3292 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3293 if (ret < 0) {
3294 goto setup_error;
3295 }
9f19cc17 3296
54d01ffb
DG
3297 /* Copy event list into message payload */
3298 memcpy(cmd_ctx->llm->payload, channels,
3299 nb_chan * sizeof(struct lttng_channel));
3300
3301 free(channels);
9f19cc17
DG
3302
3303 ret = LTTCOMM_OK;
5461b305 3304 break;
5e16da05 3305 }
9f19cc17 3306 case LTTNG_LIST_EVENTS:
5e16da05 3307 {
b551a063 3308 ssize_t nb_event;
684d34d2 3309 struct lttng_event *events = NULL;
9f19cc17 3310
b551a063 3311 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3312 cmd_ctx->lsm->u.list.channel_name, &events);
3313 if (nb_event < 0) {
3314 ret = -nb_event;
3315 goto error;
5461b305 3316 }
ca95a216 3317
54d01ffb 3318 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3319 if (ret < 0) {
3320 goto setup_error;
3321 }
9f19cc17 3322
54d01ffb
DG
3323 /* Copy event list into message payload */
3324 memcpy(cmd_ctx->llm->payload, events,
3325 nb_event * sizeof(struct lttng_event));
9f19cc17 3326
54d01ffb 3327 free(events);
9f19cc17
DG
3328
3329 ret = LTTCOMM_OK;
5461b305 3330 break;
5e16da05
MD
3331 }
3332 case LTTNG_LIST_SESSIONS:
3333 {
54d01ffb 3334 session_lock_list();
5461b305 3335
6c9cc2ab 3336 if (session_list_ptr->count == 0) {
f3ed775e