Introduce --with-consumer32-bindir and --with-consumer64-bindir
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
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
MD
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
DG
119/* global wait shm path for UST */
120static char wait_shm_path[PATH_MAX];
fac6795d 121
1d4b027a 122/* Sockets and FDs */
d6f42150
DG
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;
aea829b3 1924 channels[i].enabled = uchan->enabled;
5edd7e09
DG
1925 switch (uchan->attr.output) {
1926 case LTTNG_UST_MMAP:
1927 default:
1928 channels[i].attr.output = LTTNG_EVENT_MMAP;
1929 break;
1930 }
befe0905 1931 i++;
b551a063
DG
1932 }
1933 break;
1934 }
1935 default:
1936 break;
1937 }
1938}
1939
1940/*
1941 * Create a list of ust global domain events.
1942 */
1943static int list_lttng_ust_global_events(char *channel_name,
1944 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1945{
1946 int i = 0, ret = 0;
1947 unsigned int nb_event = 0;
1948 struct cds_lfht_iter iter;
d7b75b30 1949 struct cds_lfht_node *node;
b551a063
DG
1950 struct ltt_ust_channel *uchan;
1951 struct ltt_ust_event *uevent;
1952 struct lttng_event *tmp;
1953
1954 DBG("Listing UST global events for channel %s", channel_name);
1955
1956 rcu_read_lock();
1957
d7b75b30
DG
1958 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
1959 strlen(channel_name), &iter);
1960 if (node == NULL) {
1961 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
1962 goto error;
b551a063
DG
1963 }
1964
d7b75b30
DG
1965 uchan = caa_container_of(node, struct ltt_ust_channel, node);
1966
1967 nb_event += hashtable_get_count(uchan->events);
1968
b551a063
DG
1969 if (nb_event == 0) {
1970 ret = nb_event;
1971 goto error;
1972 }
1973
1974 DBG3("Listing UST global %d events", nb_event);
1975
1976 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1977 if (tmp == NULL) {
1978 ret = -LTTCOMM_FATAL;
1979 goto error;
1980 }
1981
d7b75b30
DG
1982 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1983 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1984 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1985 tmp[i].enabled = uevent->enabled;
1986 switch (uevent->attr.instrumentation) {
1987 case LTTNG_UST_TRACEPOINT:
1988 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1989 break;
1990 case LTTNG_UST_PROBE:
1991 tmp[i].type = LTTNG_EVENT_PROBE;
1992 break;
1993 case LTTNG_UST_FUNCTION:
1994 tmp[i].type = LTTNG_EVENT_FUNCTION;
1995 break;
9f19cc17 1996 }
d7b75b30 1997 i++;
9f19cc17
DG
1998 }
1999
b551a063
DG
2000 ret = nb_event;
2001 *events = tmp;
2002
2003error:
2004 rcu_read_unlock();
2005 return ret;
9f19cc17
DG
2006}
2007
2008/*
b551a063 2009 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2010 */
b551a063
DG
2011static int list_lttng_kernel_events(char *channel_name,
2012 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2013{
b551a063
DG
2014 int i = 0, ret;
2015 unsigned int nb_event;
9f19cc17 2016 struct ltt_kernel_event *event;
b551a063
DG
2017 struct ltt_kernel_channel *kchan;
2018
2019 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2020 if (kchan == NULL) {
2021 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2022 goto error;
2023 }
2024
2025 nb_event = kchan->event_count;
9f19cc17
DG
2026
2027 DBG("Listing events for channel %s", kchan->channel->name);
2028
b551a063
DG
2029 if (nb_event == 0) {
2030 ret = nb_event;
2031 goto error;
2032 }
2033
2034 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2035 if (*events == NULL) {
2036 ret = LTTCOMM_FATAL;
2037 goto error;
2038 }
2039
9f19cc17
DG
2040 /* Kernel channels */
2041 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2042 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2043 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2044 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2045 switch (event->event->instrumentation) {
2046 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2047 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2048 break;
2049 case LTTNG_KERNEL_KPROBE:
2050 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2051 (*events)[i].type = LTTNG_EVENT_PROBE;
2052 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2053 sizeof(struct lttng_kernel_kprobe));
2054 break;
2055 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2056 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2057 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2058 sizeof(struct lttng_kernel_function));
2059 break;
0133c199 2060 case LTTNG_KERNEL_NOOP:
b551a063 2061 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2062 break;
a54bd42d 2063 case LTTNG_KERNEL_SYSCALL:
b551a063 2064 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2065 break;
7a3d1328
MD
2066 case LTTNG_KERNEL_ALL:
2067 assert(0);
2068 break;
9f19cc17
DG
2069 }
2070 i++;
2071 }
b551a063
DG
2072
2073 return nb_event;
2074
2075error:
2076 return ret;
9f19cc17
DG
2077}
2078
fac6795d 2079/*
54d01ffb 2080 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2081 */
54d01ffb
DG
2082static int cmd_disable_channel(struct ltt_session *session,
2083 int domain, char *channel_name)
fac6795d 2084{
54d01ffb 2085 int ret;
78f0bacd
DG
2086 struct ltt_ust_session *usess;
2087
2088 usess = session->ust_session;
379473d2 2089
54d01ffb 2090 switch (domain) {
78f0bacd
DG
2091 case LTTNG_DOMAIN_KERNEL:
2092 {
2093 ret = channel_kernel_disable(session->kernel_session,
2094 channel_name);
2095 if (ret != LTTCOMM_OK) {
2096 goto error;
2097 }
54d01ffb 2098
78f0bacd
DG
2099 kernel_wait_quiescent(kernel_tracer_fd);
2100 break;
2101 }
2102 case LTTNG_DOMAIN_UST:
2103 {
2104 struct ltt_ust_channel *uchan;
2105
2106 /* Get channel in global UST domain HT */
2107 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2108 channel_name);
2109 if (uchan == NULL) {
2110 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2111 goto error;
78f0bacd
DG
2112 }
2113
2114 ret = ust_app_disable_channel_all(usess, uchan);
2115 if (ret < 0) {
2116 ret = LTTCOMM_UST_DISABLE_FAIL;
2117 goto error;
2118 }
2119
2120 uchan->enabled = 0;
2121
2122 break;
2123 }
2124 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2125 case LTTNG_DOMAIN_UST_EXEC_NAME:
2126 case LTTNG_DOMAIN_UST_PID:
2127 ret = LTTCOMM_NOT_IMPLEMENTED;
2128 goto error;
2129 default:
2130 ret = LTTCOMM_UNKNOWN_DOMAIN;
2131 goto error;
20fe2104
DG
2132 }
2133
54d01ffb 2134 ret = LTTCOMM_OK;
d65106b1 2135
54d01ffb
DG
2136error:
2137 return ret;
2138}
2139
56fff090
DG
2140/*
2141 * Copy channel from attributes and set it in the application channel list.
2142 */
f6a9efaa 2143/*
56fff090
DG
2144static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2145 struct lttng_channel *attr, struct ust_app *app)
2146{
2147 int ret;
2148 struct ltt_ust_channel *uchan, *new_chan;
2149
f6a9efaa 2150 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2151 if (uchan == NULL) {
2152 ret = LTTCOMM_FATAL;
2153 goto error;
2154 }
2155
2156 new_chan = trace_ust_create_channel(attr, usess->path);
2157 if (new_chan == NULL) {
2158 PERROR("malloc ltt_ust_channel");
2159 ret = LTTCOMM_FATAL;
2160 goto error;
2161 }
2162
2163 ret = channel_ust_copy(new_chan, uchan);
2164 if (ret < 0) {
2165 ret = LTTCOMM_FATAL;
2166 goto error;
2167 }
2168
56fff090
DG
2169error:
2170 return ret;
2171}
f6a9efaa 2172*/
56fff090 2173
54d01ffb
DG
2174/*
2175 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2176 */
44d3bd01 2177static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2178 int domain, struct lttng_channel *attr)
54d01ffb
DG
2179{
2180 int ret;
f6a9efaa
DG
2181 struct ltt_ust_session *usess = session->ust_session;
2182
5d56b5aa 2183 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2184
aea829b3 2185 switch (domain) {
44d3bd01
DG
2186 case LTTNG_DOMAIN_KERNEL:
2187 {
2188 struct ltt_kernel_channel *kchan;
54d01ffb 2189
44d3bd01
DG
2190 kchan = trace_kernel_get_channel_by_name(attr->name,
2191 session->kernel_session);
2192 if (kchan == NULL) {
2193 ret = channel_kernel_create(session->kernel_session,
2194 attr, kernel_poll_pipe[1]);
2195 } else {
2196 ret = channel_kernel_enable(session->kernel_session, kchan);
2197 }
2198
2199 if (ret != LTTCOMM_OK) {
2200 goto error;
2201 }
2202
2203 kernel_wait_quiescent(kernel_tracer_fd);
2204 break;
2205 }
f6a9efaa
DG
2206 case LTTNG_DOMAIN_UST:
2207 {
2208 struct ltt_ust_channel *uchan;
2209
48842b30 2210 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2211
48842b30 2212 /* Get channel in global UST domain HT */
f6a9efaa
DG
2213 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2214 attr->name);
2215 if (uchan == NULL) {
48842b30 2216 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2217 if (uchan == NULL) {
2218 ret = LTTCOMM_UST_CHAN_FAIL;
2219 goto error;
2220 }
d5cd1f34 2221
f6a9efaa
DG
2222 rcu_read_lock();
2223 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2224 rcu_read_unlock();
48842b30 2225 DBG2("UST channel %s added to global domain HT", attr->name);
78f0bacd
DG
2226
2227 /* Add channel to all registered applications */
2228 ret = ust_app_create_channel_all(usess, uchan);
2229 if (ret != 0) {
2230 ret = LTTCOMM_UST_CHAN_FAIL;
2231 goto error;
2232 }
f6a9efaa 2233 } else {
78f0bacd
DG
2234 /* If already enabled, everything is OK */
2235 if (uchan->enabled) {
2236 ret = LTTCOMM_OK;
2237 goto error;
2238 }
f6a9efaa 2239
78f0bacd
DG
2240 ret = ust_app_enable_channel_all(usess, uchan);
2241 if (ret < 0) {
2242 ret = LTTCOMM_UST_ENABLE_FAIL;
2243 goto error;
2244 }
48842b30 2245 }
f6a9efaa 2246
37357452
DG
2247 uchan->enabled = 1;
2248
f6a9efaa
DG
2249 break;
2250 }
78f0bacd
DG
2251 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2252 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2253 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG
2254 ret = LTTCOMM_NOT_IMPLEMENTED;
2255 goto error;
44d3bd01
DG
2256 default:
2257 ret = LTTCOMM_UNKNOWN_DOMAIN;
2258 goto error;
54d01ffb
DG
2259 }
2260
2261 ret = LTTCOMM_OK;
2262
2263error:
2264 return ret;
2265}
2266
2267/*
2268 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2269 */
2270static int cmd_disable_event(struct ltt_session *session, int domain,
2271 char *channel_name, char *event_name)
2272{
2273 int ret;
54d01ffb
DG
2274
2275 switch (domain) {
2276 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2277 {
2278 struct ltt_kernel_channel *kchan;
b0a40d28 2279 struct ltt_kernel_session *ksess;
2bdd86d4 2280
b0a40d28
DG
2281 ksess = session->kernel_session;
2282
2283 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2284 if (kchan == NULL) {
2285 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2286 goto error;
d65106b1
DG
2287 }
2288
b0a40d28 2289 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2290 if (ret != LTTCOMM_OK) {
2291 goto error;
2292 }
2293
2294 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2295 break;
2bdd86d4
MD
2296 }
2297 case LTTNG_DOMAIN_UST:
b0a40d28
DG
2298 {
2299 struct ltt_ust_session *usess;
2300 struct ltt_ust_channel *uchan;
2301
2302 usess = session->ust_session;
2303
2304 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2305 channel_name);
2306 if (uchan == NULL) {
2307 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2308 goto error;
2309 }
2310
2311 ret = ust_app_disable_event(usess, uchan, event_name);
2312 if (ret < 0) {
2313 ret = LTTCOMM_UST_DISABLE_FAIL;
2314 goto error;
2315 }
2316
2317 DBG2("Disable UST event %s in channel %s completed", event_name,
2318 channel_name);
2319
2320 break;
2321 }
2bdd86d4
MD
2322 case LTTNG_DOMAIN_UST_EXEC_NAME:
2323 case LTTNG_DOMAIN_UST_PID:
2324 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2325 default:
54d01ffb
DG
2326 ret = LTTCOMM_NOT_IMPLEMENTED;
2327 goto error;
d65106b1 2328 }
26cc6b4e 2329
54d01ffb
DG
2330 ret = LTTCOMM_OK;
2331
2332error:
2333 return ret;
2334}
2335
2336/*
2337 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2338 */
2339static int cmd_disable_event_all(struct ltt_session *session, int domain,
2340 char *channel_name)
2341{
2342 int ret;
54d01ffb
DG
2343
2344 switch (domain) {
2345 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2346 {
2347 struct ltt_kernel_session *ksess;
2348 struct ltt_kernel_channel *kchan;
2349
2350 ksess = session->kernel_session;
2351
2352 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2353 if (kchan == NULL) {
2354 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2355 goto error;
26cc6b4e
DG
2356 }
2357
9730260e 2358 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2359 if (ret != LTTCOMM_OK) {
0b97ec54 2360 goto error;
26cc6b4e
DG
2361 }
2362
54d01ffb 2363 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2364 break;
9730260e
DG
2365 }
2366 case LTTNG_DOMAIN_UST:
2367 {
2368 struct ltt_ust_session *usess;
2369 struct ltt_ust_channel *uchan;
2370
2371 usess = session->ust_session;
2372
2373 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2374 channel_name);
2375 if (uchan == NULL) {
2376 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2377 goto error;
2378 }
2379
2380 ret = ust_app_disable_event_all(usess, uchan);
2381 if (ret < 0) {
2382 ret = LTTCOMM_UST_DISABLE_FAIL;
2383 goto error;
2384 }
2385
2386 DBG2("Disable all UST event in channel %s completed", channel_name);
2387
2388 break;
2389 }
2390 case LTTNG_DOMAIN_UST_EXEC_NAME:
2391 case LTTNG_DOMAIN_UST_PID:
2392 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2393 default:
54d01ffb
DG
2394 ret = LTTCOMM_NOT_IMPLEMENTED;
2395 goto error;
26cc6b4e 2396 }
e953ef25 2397
54d01ffb 2398 ret = LTTCOMM_OK;
e953ef25 2399
54d01ffb
DG
2400error:
2401 return ret;
2402}
f5177a38 2403
54d01ffb
DG
2404/*
2405 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2406 */
2407static int cmd_add_context(struct ltt_session *session, int domain,
2408 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2409{
2410 int ret;
f5177a38 2411
54d01ffb
DG
2412 switch (domain) {
2413 case LTTNG_DOMAIN_KERNEL:
2414 /* Add kernel context to kernel tracer */
2415 ret = context_kernel_add(session->kernel_session, ctx,
2416 event_name, channel_name);
2417 if (ret != LTTCOMM_OK) {
f5177a38 2418 goto error;
e953ef25 2419 }
2bdd86d4
MD
2420 break;
2421 case LTTNG_DOMAIN_UST:
2422 {
48842b30
DG
2423 /*
2424 struct ltt_ust_session *usess;
e953ef25 2425
48842b30
DG
2426 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2427 ret = context_ust_add(usess, ctx,
2428 event_name, channel_name, domain);
2bdd86d4
MD
2429 if (ret != LTTCOMM_OK) {
2430 goto error;
2431 }
2432 }
e953ef25 2433 break;
48842b30 2434 */
2bdd86d4 2435 }
54d01ffb 2436 default:
2bdd86d4 2437 /* TODO: UST other domains */
54d01ffb
DG
2438 ret = LTTCOMM_NOT_IMPLEMENTED;
2439 goto error;
e953ef25 2440 }
950131af 2441
54d01ffb 2442 ret = LTTCOMM_OK;
950131af 2443
54d01ffb
DG
2444error:
2445 return ret;
2446}
2447
2448/*
2449 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2450 */
2451static int cmd_enable_event(struct ltt_session *session, int domain,
2452 char *channel_name, struct lttng_event *event)
2453{
2454 int ret;
f6cd6b0f 2455 struct lttng_channel *attr;
48842b30 2456 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2457
2458 switch (domain) {
2459 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2460 {
2461 struct ltt_kernel_channel *kchan;
2462
54d01ffb
DG
2463 kchan = trace_kernel_get_channel_by_name(channel_name,
2464 session->kernel_session);
2465 if (kchan == NULL) {
f6cd6b0f
DG
2466 attr = channel_new_default_attr(domain);
2467 if (attr == NULL) {
2468 ret = LTTCOMM_FATAL;
2469 goto error;
2470 }
2471 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2472
54d01ffb 2473 /* This call will notify the kernel thread */
44d3bd01 2474 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2475 attr, kernel_poll_pipe[1]);
54d01ffb 2476 if (ret != LTTCOMM_OK) {
ff4d74e6 2477 free(attr);
f5177a38
DG
2478 goto error;
2479 }
ff4d74e6 2480 free(attr);
54d01ffb 2481 }
950131af 2482
54d01ffb
DG
2483 /* Get the newly created kernel channel pointer */
2484 kchan = trace_kernel_get_channel_by_name(channel_name,
2485 session->kernel_session);
2486 if (kchan == NULL) {
2487 /* This sould not happen... */
2488 ret = LTTCOMM_FATAL;
2489 goto error;
2490 }
f5177a38 2491
48842b30
DG
2492 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2493 event);
54d01ffb 2494 if (ret != LTTCOMM_OK) {
f5177a38 2495 goto error;
950131af
DG
2496 }
2497
54d01ffb 2498 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2499 break;
2bdd86d4
MD
2500 }
2501 case LTTNG_DOMAIN_UST:
2502 {
48842b30
DG
2503 struct ltt_ust_channel *uchan;
2504 struct ltt_ust_event *uevent;
aea829b3 2505 struct lttng_channel *attr;
2bdd86d4 2506
48842b30
DG
2507 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2508 channel_name);
2509 if (uchan == NULL) {
aea829b3
DG
2510 /* Create default channel */
2511 attr = channel_new_default_attr(domain);
2512 if (attr == NULL) {
2513 ret = LTTCOMM_FATAL;
2514 goto error;
2515 }
596219f7 2516 snprintf(attr->name, NAME_MAX, "%s", channel_name);
aea829b3
DG
2517
2518 /* Use the internal command enable channel */
2519 ret = cmd_enable_channel(session, domain, attr);
2520 if (ret < 0) {
ff4d74e6 2521 free(attr);
aea829b3
DG
2522 goto error;
2523 }
2524
2525 free(attr);
2526
2527 /* Get the newly created channel reference back */
2528 uchan = trace_ust_find_channel_by_name(
2529 usess->domain_global.channels, channel_name);
2530 if (uchan == NULL) {
2531 /* Something is really wrong */
2532 ret = LTTCOMM_FATAL;
2533 goto error;
2534 }
48842b30 2535 }
2bdd86d4 2536
48842b30
DG
2537 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2538 if (uevent == NULL) {
2539 uevent = trace_ust_create_event(event);
2540 if (uevent == NULL) {
2bdd86d4
MD
2541 ret = LTTCOMM_FATAL;
2542 goto error;
2543 }
d5cd1f34 2544
48842b30 2545 }
2bdd86d4 2546
5b4a0ec0 2547 ret = ust_app_create_event_all(usess, uchan, uevent);
48842b30
DG
2548 if (ret < 0) {
2549 ret = LTTCOMM_UST_ENABLE_FAIL;
2550 goto error;
2bdd86d4 2551 }
487cf67c 2552
d5cd1f34 2553 /* Add ltt ust event to channel */
487cf67c
DG
2554 rcu_read_lock();
2555 hashtable_add_unique(uchan->events, &uevent->node);
2556 rcu_read_unlock();
d5cd1f34 2557
37357452
DG
2558 uevent->enabled = 1;
2559
d5cd1f34
DG
2560 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2561 uchan->name);
2bdd86d4
MD
2562 break;
2563 }
2564 case LTTNG_DOMAIN_UST_EXEC_NAME:
2565 case LTTNG_DOMAIN_UST_PID:
2566 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2567 default:
54d01ffb
DG
2568 ret = LTTCOMM_NOT_IMPLEMENTED;
2569 goto error;
950131af 2570 }
d36b8583 2571
54d01ffb 2572 ret = LTTCOMM_OK;
d36b8583 2573
54d01ffb
DG
2574error:
2575 return ret;
2576}
7d29a247 2577
54d01ffb
DG
2578/*
2579 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2580 */
2581static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2582 char *channel_name, int event_type)
54d01ffb
DG
2583{
2584 int ret;
2585 struct ltt_kernel_channel *kchan;
7d29a247 2586
54d01ffb
DG
2587 switch (domain) {
2588 case LTTNG_DOMAIN_KERNEL:
2589 kchan = trace_kernel_get_channel_by_name(channel_name,
2590 session->kernel_session);
2591 if (kchan == NULL) {
2592 /* This call will notify the kernel thread */
44d3bd01
DG
2593 ret = channel_kernel_create(session->kernel_session, NULL,
2594 kernel_poll_pipe[1]);
54d01ffb
DG
2595 if (ret != LTTCOMM_OK) {
2596 goto error;
d36b8583 2597 }
54d01ffb 2598 }
0d0c377a 2599
54d01ffb
DG
2600 /* Get the newly created kernel channel pointer */
2601 kchan = trace_kernel_get_channel_by_name(channel_name,
2602 session->kernel_session);
2603 if (kchan == NULL) {
2604 /* This sould not happen... */
2605 ret = LTTCOMM_FATAL;
2606 goto error;
2607 }
0fdd1e2c 2608
7a3d1328
MD
2609 switch (event_type) {
2610 case LTTNG_KERNEL_SYSCALL:
2611 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2612 kchan, kernel_tracer_fd);
7a3d1328
MD
2613 break;
2614 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2615 /*
7a3d1328
MD
2616 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2617 * events already registered to the channel.
8c9ae521 2618 */
7a3d1328
MD
2619 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2620 kchan, kernel_tracer_fd);
2621 break;
2622 case LTTNG_KERNEL_ALL:
2623 /* Enable syscalls and tracepoints */
8c9ae521
DG
2624 ret = event_kernel_enable_all(session->kernel_session,
2625 kchan, kernel_tracer_fd);
7a3d1328
MD
2626 break;
2627 default:
2628 ret = LTTCOMM_KERN_ENABLE_FAIL;
2629 goto error;
8c9ae521 2630 }
54d01ffb 2631 if (ret != LTTCOMM_OK) {
0d0c377a 2632 goto error;
d36b8583
DG
2633 }
2634
54d01ffb 2635 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2636 break;
54d01ffb
DG
2637 default:
2638 /* TODO: Userspace tracing */
2639 ret = LTTCOMM_NOT_IMPLEMENTED;
2640 goto error;
d36b8583 2641 }
f3ed775e 2642
54d01ffb
DG
2643 ret = LTTCOMM_OK;
2644
2645error:
2646 return ret;
2647}
2648
2649/*
2650 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2651 */
2652static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2653{
2654 int ret;
2655 ssize_t nb_events = 0;
2656
2657 switch (domain) {
2658 case LTTNG_DOMAIN_KERNEL:
2659 nb_events = kernel_list_events(kernel_tracer_fd, events);
2660 if (nb_events < 0) {
2661 ret = LTTCOMM_KERN_LIST_FAIL;
2662 goto error;
894be886 2663 }
54d01ffb 2664 break;
b551a063
DG
2665 case LTTNG_DOMAIN_UST:
2666 nb_events = ust_app_list_events(events);
2667 if (nb_events < 0) {
2668 ret = LTTCOMM_UST_LIST_FAIL;
2669 goto error;
2670 }
2671 break;
54d01ffb 2672 default:
54d01ffb
DG
2673 ret = LTTCOMM_NOT_IMPLEMENTED;
2674 goto error;
2675 }
894be886 2676
54d01ffb 2677 return nb_events;
7d29a247 2678
54d01ffb
DG
2679error:
2680 /* Return negative value to differentiate return code */
2681 return -ret;
2682}
b389abbe 2683
54d01ffb
DG
2684/*
2685 * Command LTTNG_START_TRACE processed by the client thread.
2686 */
2687static int cmd_start_trace(struct ltt_session *session)
2688{
2689 int ret;
54d01ffb 2690 struct ltt_kernel_session *ksession;
b9d9b220 2691 struct ltt_ust_session *usess;
b389abbe 2692
54d01ffb
DG
2693 /* Short cut */
2694 ksession = session->kernel_session;
b9d9b220 2695 usess = session->ust_session;
5eb91c98 2696
464dd62d
MD
2697 if (session->enabled)
2698 return LTTCOMM_UST_START_FAIL;
2699 session->enabled = 1;
2700
54d01ffb
DG
2701 /* Kernel tracing */
2702 if (ksession != NULL) {
2bdd86d4
MD
2703 struct ltt_kernel_channel *kchan;
2704
54d01ffb
DG
2705 /* Open kernel metadata */
2706 if (ksession->metadata == NULL) {
2707 ret = kernel_open_metadata(ksession, ksession->trace_path);
2708 if (ret < 0) {
2709 ret = LTTCOMM_KERN_META_FAIL;
2710 goto error;
b389abbe 2711 }
54d01ffb 2712 }
7d29a247 2713
54d01ffb
DG
2714 /* Open kernel metadata stream */
2715 if (ksession->metadata_stream_fd == 0) {
2716 ret = kernel_open_metadata_stream(ksession);
2717 if (ret < 0) {
2718 ERR("Kernel create metadata stream failed");
2719 ret = LTTCOMM_KERN_STREAM_FAIL;
2720 goto error;
2721 }
2722 }
2723
2724 /* For each channel */
2725 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2726 if (kchan->stream_count == 0) {
2727 ret = kernel_open_channel_stream(kchan);
2728 if (ret < 0) {
2729 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2730 goto error;
2731 }
54d01ffb
DG
2732 /* Update the stream global counter */
2733 ksession->stream_count_global += ret;
7d29a247 2734 }
54d01ffb
DG
2735 }
2736
2737 /* Setup kernel consumer socket and send fds to it */
2738 ret = init_kernel_tracing(ksession);
2739 if (ret < 0) {
2740 ret = LTTCOMM_KERN_START_FAIL;
2741 goto error;
2742 }
2743
2744 /* This start the kernel tracing */
2745 ret = kernel_start_session(ksession);
2746 if (ret < 0) {
2747 ret = LTTCOMM_KERN_START_FAIL;
2748 goto error;
2749 }
2750
2751 /* Quiescent wait after starting trace */
2752 kernel_wait_quiescent(kernel_tracer_fd);
2753 }
2754
36dc12cc 2755 /* Flag session that trace should start automatically */
b9d9b220
DG
2756 if (usess) {
2757 usess->start_trace = 1;
36dc12cc 2758
b9d9b220
DG
2759 ret = ust_app_start_trace_all(usess);
2760 if (ret < 0) {
2761 ret = LTTCOMM_UST_START_FAIL;
2762 goto error;
2763 }
2bdd86d4 2764 }
54d01ffb
DG
2765
2766 ret = LTTCOMM_OK;
2767
2768error:
2769 return ret;
2770}
2771
2772/*
2773 * Command LTTNG_STOP_TRACE processed by the client thread.
2774 */
2775static int cmd_stop_trace(struct ltt_session *session)
2776{
2777 int ret;
2778 struct ltt_kernel_channel *kchan;
2779 struct ltt_kernel_session *ksession;
8be98f9a 2780 struct ltt_ust_session *usess;
54d01ffb
DG
2781
2782 /* Short cut */
2783 ksession = session->kernel_session;
8be98f9a 2784 usess = session->ust_session;
54d01ffb 2785
464dd62d
MD
2786 if (!session->enabled)
2787 return LTTCOMM_UST_START_FAIL;
2788 session->enabled = 0;
2789
54d01ffb
DG
2790 /* Kernel tracer */
2791 if (ksession != NULL) {
2792 DBG("Stop kernel tracing");
2793
2794 /* Flush all buffers before stopping */
2795 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2796 if (ret < 0) {
2797 ERR("Kernel metadata flush failed");
2798 }
f34daff7 2799
54d01ffb
DG
2800 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2801 ret = kernel_flush_buffer(kchan);
0d0c377a 2802 if (ret < 0) {
54d01ffb 2803 ERR("Kernel flush buffer error");
7d29a247 2804 }
54d01ffb 2805 }
19e70852 2806
54d01ffb
DG
2807 ret = kernel_stop_session(ksession);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2810 goto error;
f3ed775e 2811 }
54d01ffb
DG
2812
2813 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2814 }
54d01ffb 2815
8be98f9a
MD
2816 if (usess) {
2817 usess->start_trace = 0;
2bdd86d4 2818
8be98f9a 2819 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2820 if (ret < 0) {
8be98f9a 2821 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2822 goto error;
2823 }
2bdd86d4 2824 }
54d01ffb
DG
2825
2826 ret = LTTCOMM_OK;
2827
2828error:
2829 return ret;
2830}
2831
2832/*
2833 * Command LTTNG_CREATE_SESSION processed by the client thread.
2834 */
2835static int cmd_create_session(char *name, char *path)
2836{
2837 int ret;
2838
2839 ret = session_create(name, path);
2840 if (ret != LTTCOMM_OK) {
2841 goto error;
2842 }
2843
2844 ret = LTTCOMM_OK;
2845
2846error:
2847 return ret;
2848}
2849
2850/*
2851 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2852 */
2853static int cmd_destroy_session(struct ltt_session *session, char *name)
2854{
2855 int ret;
2856
2857 /* Clean kernel session teardown */
2858 teardown_kernel_session(session);
84cd17c6
MD
2859 /* UST session teardown */
2860 teardown_ust_session(session);
54d01ffb
DG
2861
2862 /*
2863 * Must notify the kernel thread here to update it's poll setin order
2864 * to remove the channel(s)' fd just destroyed.
2865 */
2866 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2867 if (ret < 0) {
2868 perror("write kernel poll pipe");
2869 }
2870
271933a4 2871 ret = session_destroy(session);
54d01ffb
DG
2872
2873 return ret;
2874}
2875
2876/*
2877 * Command LTTNG_CALIBRATE processed by the client thread.
2878 */
2879static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2880{
2881 int ret;
2882
2883 switch (domain) {
2884 case LTTNG_DOMAIN_KERNEL:
33a2b854 2885 {
54d01ffb 2886 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2887
54d01ffb
DG
2888 kcalibrate.type = calibrate->type;
2889 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2890 if (ret < 0) {
54d01ffb
DG
2891 ret = LTTCOMM_KERN_ENABLE_FAIL;
2892 goto error;
33a2b854 2893 }
54d01ffb
DG
2894 break;
2895 }
2896 default:
2897 /* TODO: Userspace tracing */
2898 ret = LTTCOMM_NOT_IMPLEMENTED;
2899 goto error;
2900 }
33a2b854 2901
54d01ffb 2902 ret = LTTCOMM_OK;
33a2b854 2903
54d01ffb
DG
2904error:
2905 return ret;
2906}
7d29a247 2907
54d01ffb
DG
2908/*
2909 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2910 */
2911static int cmd_register_consumer(struct ltt_session *session, int domain,
2912 char *sock_path)
2913{
2914 int ret, sock;
b389abbe 2915
54d01ffb
DG
2916 switch (domain) {
2917 case LTTNG_DOMAIN_KERNEL:
2918 /* Can't register a consumer if there is already one */
2919 if (session->kernel_session->consumer_fd != 0) {
2920 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2921 goto error;
2922 }
2923
2924 sock = lttcomm_connect_unix_sock(sock_path);
2925 if (sock < 0) {
2926 ret = LTTCOMM_CONNECT_FAIL;
2927 goto error;
2928 }
2929
2930 session->kernel_session->consumer_fd = sock;
2931 break;
2932 default:
2933 /* TODO: Userspace tracing */
2934 ret = LTTCOMM_NOT_IMPLEMENTED;
2935 goto error;
2936 }
2937
2938 ret = LTTCOMM_OK;
2939
2940error:
2941 return ret;
2942}
2943
2944/*
2945 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2946 */
2947static ssize_t cmd_list_domains(struct ltt_session *session,
2948 struct lttng_domain **domains)
2949{
b551a063 2950 int ret, index = 0;
54d01ffb
DG
2951 ssize_t nb_dom = 0;
2952
2953 if (session->kernel_session != NULL) {
b551a063 2954 DBG3("Listing domains found kernel domain");
54d01ffb
DG
2955 nb_dom++;
2956 }
2957
b551a063
DG
2958 if (session->ust_session != NULL) {
2959 DBG3("Listing domains found UST global domain");
2960 nb_dom++;
2961 }
54d01ffb 2962
b551a063 2963 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
2964 if (*domains == NULL) {
2965 ret = -LTTCOMM_FATAL;
2966 goto error;
2967 }
2968
b551a063
DG
2969 if (session->kernel_session != NULL) {
2970 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2971 index++;
2972 }
2973
2974 if (session->ust_session != NULL) {
2975 (*domains)[index].type = LTTNG_DOMAIN_UST;
2976 index++;
2977 }
54d01ffb 2978
54d01ffb
DG
2979 return nb_dom;
2980
2981error:
2982 return ret;
2983}
2984
2985/*
2986 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2987 */
b551a063 2988static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
2989 struct lttng_channel **channels)
2990{
2991 int ret;
2992 ssize_t nb_chan = 0;
2993
b551a063
DG
2994 switch (domain) {
2995 case LTTNG_DOMAIN_KERNEL:
2996 if (session->kernel_session != NULL) {
2997 nb_chan = session->kernel_session->channel_count;
2998 }
0df502fd 2999 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3000 break;
3001 case LTTNG_DOMAIN_UST:
3002 if (session->ust_session != NULL) {
3003 nb_chan = hashtable_get_count(
3004 session->ust_session->domain_global.channels);
3005 }
0df502fd 3006 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3007 break;
3008 default:
3009 *channels = NULL;
3010 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3011 goto error;
3012 }
3013
b551a063
DG
3014 if (nb_chan > 0) {
3015 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3016 if (*channels == NULL) {
3017 ret = -LTTCOMM_FATAL;
3018 goto error;
3019 }
54d01ffb 3020
b551a063
DG
3021 list_lttng_channels(domain, session, *channels);
3022 } else {
3023 *channels = NULL;
3024 }
2bdd86d4 3025
54d01ffb
DG
3026 return nb_chan;
3027
3028error:
3029 return ret;
3030}
3031
3032/*
3033 * Command LTTNG_LIST_EVENTS processed by the client thread.
3034 */
b551a063 3035static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3036 char *channel_name, struct lttng_event **events)
3037{
b551a063 3038 int ret = 0;
54d01ffb 3039 ssize_t nb_event = 0;
54d01ffb 3040
b551a063
DG
3041 switch (domain) {
3042 case LTTNG_DOMAIN_KERNEL:
3043 if (session->kernel_session != NULL) {
3044 nb_event = list_lttng_kernel_events(channel_name,
3045 session->kernel_session, events);
54d01ffb 3046 }
b551a063
DG
3047 break;
3048 case LTTNG_DOMAIN_UST:
3049 {
3050 if (session->ust_session != NULL) {
3051 nb_event = list_lttng_ust_global_events(channel_name,
3052 &session->ust_session->domain_global, events);
3053 }
3054 break;
54d01ffb 3055 }
b551a063
DG
3056 default:
3057 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3058 goto error;
3059 }
3060
b551a063 3061 ret = nb_event;
54d01ffb
DG
3062
3063error:
3064 return ret;
3065}
3066
3067/*
3068 * Process the command requested by the lttng client within the command
3069 * context structure. This function make sure that the return structure (llm)
3070 * is set and ready for transmission before returning.
3071 *
3072 * Return any error encountered or 0 for success.
3073 */
3074static int process_client_msg(struct command_ctx *cmd_ctx)
3075{
3076 int ret = LTTCOMM_OK;
44d3bd01 3077 int need_tracing_session = 1;
54d01ffb
DG
3078
3079 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3080
3081 /*
3082 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3083 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3084 * command.
3085 */
3086 switch(cmd_ctx->lsm->cmd_type) {
3087 case LTTNG_LIST_SESSIONS:
3088 case LTTNG_LIST_TRACEPOINTS:
3089 case LTTNG_LIST_DOMAINS:
3090 case LTTNG_LIST_CHANNELS:
3091 case LTTNG_LIST_EVENTS:
3092 break;
3093 default:
3094 /* Setup lttng message with no payload */
3095 ret = setup_lttng_msg(cmd_ctx, 0);
3096 if (ret < 0) {
3097 /* This label does not try to unlock the session */
3098 goto init_setup_error;
3099 }
3100 }
3101
3102 /* Commands that DO NOT need a session. */
3103 switch (cmd_ctx->lsm->cmd_type) {
3104 case LTTNG_CALIBRATE:
3105 case LTTNG_CREATE_SESSION:
3106 case LTTNG_LIST_SESSIONS:
3107 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3108 need_tracing_session = 0;
54d01ffb
DG
3109 break;
3110 default:
3111 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3112 session_lock_list();
54d01ffb 3113 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3114 session_unlock_list();
54d01ffb
DG
3115 if (cmd_ctx->session == NULL) {
3116 if (cmd_ctx->lsm->session.name != NULL) {
3117 ret = LTTCOMM_SESS_NOT_FOUND;
3118 } else {
3119 /* If no session name specified */
3120 ret = LTTCOMM_SELECT_SESS;
3121 }
3122 goto error;
3123 } else {
3124 /* Acquire lock for the session */
3125 session_lock(cmd_ctx->session);
3126 }
3127 break;
3128 }
b389abbe 3129
54d01ffb
DG
3130 /*
3131 * Check domain type for specific "pre-action".
3132 */
3133 switch (cmd_ctx->lsm->domain.type) {
3134 case LTTNG_DOMAIN_KERNEL:
3135 /* Kernel tracer check */
3136 if (kernel_tracer_fd == 0) {
3137 /* Basically, load kernel tracer modules */
3138 init_kernel_tracer();
3139 if (kernel_tracer_fd == 0) {
3140 ret = LTTCOMM_KERN_NA;
3141 goto error;
3142 }
3143 }
5eb91c98 3144
54d01ffb 3145 /* Need a session for kernel command */
44d3bd01 3146 if (need_tracing_session) {
54d01ffb
DG
3147 if (cmd_ctx->session->kernel_session == NULL) {
3148 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3149 if (ret < 0) {
54d01ffb 3150 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3151 goto error;
3152 }
b389abbe 3153 }
7d29a247 3154
54d01ffb 3155 /* Start the kernel consumer daemon */
3bd1e081
MD
3156 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3157 if (kconsumer_data.pid == 0 &&
54d01ffb 3158 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3159 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3160 ret = start_consumerd(&kconsumer_data);
7d29a247 3161 if (ret < 0) {
54d01ffb
DG
3162 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3163 goto error;
950131af 3164 }
3ff2ecac
MD
3165 } else {
3166 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3167 }
0d0c377a 3168 }
54d01ffb 3169 break;
2bdd86d4 3170 case LTTNG_DOMAIN_UST:
44d3bd01 3171 {
44d3bd01 3172 if (need_tracing_session) {
f6a9efaa 3173 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3174 ret = create_ust_session(cmd_ctx->session,
3175 &cmd_ctx->lsm->domain);
3176 if (ret != LTTCOMM_OK) {
3177 goto error;
3178 }
3179 }
7753dea8
MD
3180 /* Start the UST consumer daemons */
3181 /* 64-bit */
3182 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3183 if (consumerd64_bindir[0] != '\0' &&
3184 ustconsumer64_data.pid == 0 &&
2bdd86d4 3185 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3186 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3187 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3188 if (ret < 0) {
7753dea8
MD
3189 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3190 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3191 goto error;
3192 }
48842b30 3193
7753dea8 3194 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3195 } else {
7753dea8
MD
3196 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3197 }
3198 /* 32-bit */
3199 if (consumerd32_bindir[0] != '\0' &&
3200 ustconsumer32_data.pid == 0 &&
3201 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3202 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3203 ret = start_consumerd(&ustconsumer32_data);
3204 if (ret < 0) {
3205 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3206 ust_consumerd32_fd = -EINVAL;
3207 goto error;
3208 }
3209 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3210 } else {
3211 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3212 }
44d3bd01
DG
3213 }
3214 break;
48842b30 3215 }
54d01ffb 3216 default:
54d01ffb
DG
3217 break;
3218 }
33a2b854 3219
54d01ffb
DG
3220 /* Process by command type */
3221 switch (cmd_ctx->lsm->cmd_type) {
3222 case LTTNG_ADD_CONTEXT:
3223 {
3224 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3225 cmd_ctx->lsm->u.context.channel_name,
3226 cmd_ctx->lsm->u.context.event_name,
3227 &cmd_ctx->lsm->u.context.ctx);
3228 break;
3229 }
3230 case LTTNG_DISABLE_CHANNEL:
3231 {
3232 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3233 cmd_ctx->lsm->u.disable.channel_name);
3234 break;
3235 }
3236 case LTTNG_DISABLE_EVENT:
3237 {
3238 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3239 cmd_ctx->lsm->u.disable.channel_name,
3240 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3241 ret = LTTCOMM_OK;
3242 break;
3243 }
54d01ffb
DG
3244 case LTTNG_DISABLE_ALL_EVENT:
3245 {
2bdd86d4 3246 DBG("Disabling all events");
54d01ffb
DG
3247
3248 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3249 cmd_ctx->lsm->u.disable.channel_name);
3250 break;
3251 }
3252 case LTTNG_ENABLE_CHANNEL:
3253 {
aea829b3 3254 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG
3255 &cmd_ctx->lsm->u.channel.chan);
3256 break;
3257 }
3258 case LTTNG_ENABLE_EVENT:
3259 {
3260 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3261 cmd_ctx->lsm->u.enable.channel_name,
3262 &cmd_ctx->lsm->u.enable.event);
3263 break;
3264 }
3265 case LTTNG_ENABLE_ALL_EVENT:
3266 {
2bdd86d4 3267 DBG("Enabling all events");
54d01ffb
DG
3268
3269 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3270 cmd_ctx->lsm->u.enable.channel_name,
3271 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3272 break;
3273 }
052da939 3274 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3275 {
9f19cc17 3276 struct lttng_event *events;
54d01ffb 3277 ssize_t nb_events;
052da939 3278
54d01ffb
DG
3279 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3280 if (nb_events < 0) {
3281 ret = -nb_events;
3282 goto error;
2ef84c95
DG
3283 }
3284
3285 /*
3286 * Setup lttng message with payload size set to the event list size in
3287 * bytes and then copy list into the llm payload.
3288 */
052da939 3289 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3290 if (ret < 0) {
052da939 3291 free(events);
2ef84c95
DG
3292 goto setup_error;
3293 }
3294
3295 /* Copy event list into message payload */
9f19cc17 3296 memcpy(cmd_ctx->llm->payload, events,
052da939 3297 sizeof(struct lttng_event) * nb_events);
2ef84c95 3298
9f19cc17 3299 free(events);
2ef84c95
DG
3300
3301 ret = LTTCOMM_OK;
3302 break;
3303 }
f3ed775e 3304 case LTTNG_START_TRACE:
8c0faa1d 3305 {
54d01ffb 3306 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3307 break;
3308 }
f3ed775e 3309 case LTTNG_STOP_TRACE:
8c0faa1d 3310 {
54d01ffb 3311 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3312 break;
3313 }
5e16da05
MD
3314 case LTTNG_CREATE_SESSION:
3315 {
54d01ffb
DG
3316 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3317 cmd_ctx->lsm->session.path);
5e16da05
MD
3318 break;
3319 }
3320 case LTTNG_DESTROY_SESSION:
3321 {
54d01ffb
DG
3322 ret = cmd_destroy_session(cmd_ctx->session,
3323 cmd_ctx->lsm->session.name);
5461b305 3324 break;
5e16da05 3325 }
9f19cc17 3326 case LTTNG_LIST_DOMAINS:
5e16da05 3327 {
54d01ffb
DG
3328 ssize_t nb_dom;
3329 struct lttng_domain *domains;
5461b305 3330
54d01ffb
DG
3331 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3332 if (nb_dom < 0) {
3333 ret = -nb_dom;
3334 goto error;
ce3d728c 3335 }
520ff687 3336
54d01ffb 3337 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3338 if (ret < 0) {
3339 goto setup_error;
520ff687 3340 }
57167058 3341
54d01ffb
DG
3342 /* Copy event list into message payload */
3343 memcpy(cmd_ctx->llm->payload, domains,
3344 nb_dom * sizeof(struct lttng_domain));
3345
3346 free(domains);
5e16da05 3347
5461b305 3348 ret = LTTCOMM_OK;
5e16da05
MD
3349 break;
3350 }
9f19cc17 3351 case LTTNG_LIST_CHANNELS:
5e16da05 3352 {
54d01ffb
DG
3353 size_t nb_chan;
3354 struct lttng_channel *channels;
3355
b551a063
DG