Update following loglevel support UST API change
[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 *
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14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
4771f025 53#include "kernel.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
ebaeda94
MD
60#define CONSUMERD_FILE "lttng-consumerd"
61
3bd1e081
MD
62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
fac6795d 86/* Variables */
1d4b027a 87int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 88int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 89int opt_quiet; /* Not static for lttngerr.h */
d063d709 90
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91const char *progname;
92const char *opt_tracing_group;
5b8719f5 93static int opt_sig_parent;
fac6795d
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94static int opt_daemon;
95static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 96static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
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101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
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MD
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
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117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
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121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG
125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG
130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG
136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG
150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG
159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD
171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
ebaeda94
MD
174static const char *consumerd32_path =
175 __stringify(CONFIG_CONSUMERD32_PATH);
176static const char *consumerd64_path =
177 __stringify(CONFIG_CONSUMERD64_PATH);
178static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
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182
183static
7753dea8 184void setup_consumerd_path(void)
fb09408a 185{
ebaeda94 186 const char *path, *libdir;
fb09408a 187
7753dea8
MD
188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
7753dea8 192 */
ebaeda94
MD
193#if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path[0]) {
7745933c 195 consumerd32_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200#elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path[0]) {
202 consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 203 }
ebaeda94
MD
204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
206 }
207#else
208#error "Unknown bitness"
209#endif
210
fb09408a
MD
211 /*
212 * runtime env. var. overrides the build default.
213 */
ebaeda94
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214 path = getenv("LTTNG_CONSUMERD32_PATH");
215 if (path) {
216 consumerd32_path = path;
7753dea8 217 }
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218 path = getenv("LTTNG_CONSUMERD64_PATH");
219 if (path) {
220 consumerd64_path = path;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
fb09408a
MD
229 }
230}
231
5eb91c98
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232/*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237{
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258error:
259 return ret;
260}
261
262/*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267static int check_thread_quit_pipe(int fd, uint32_t events)
268{
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274}
275
0fdd1e2c
DG
276/*
277 * Remove modules in reverse load order.
278 */
279static int modprobe_remove_kernel_modules(void)
280{
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 286 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
287 kernel_modules_list[i].name);
288 if (ret < 0) {
24b487b8 289 perror("snprintf modprobe -r");
0fdd1e2c
DG
290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
24b487b8 295 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307error:
308 return ret;
309}
310
311/*
312 * Return group ID of the tracing group or -1 if not found.
313 */
996b65c8
MD
314static gid_t allowed_group(void)
315{
316 struct group *grp;
317
274e143b
MD
318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
996b65c8
MD
323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328}
329
273ea72c 330/*
5eb91c98 331 * Init thread quit pipe.
273ea72c
DG
332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335static int init_thread_quit_pipe(void)
336{
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345error:
346 return ret;
347}
348
fac6795d 349/*
d063d709
DG
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
fac6795d 352 */
1d4b027a 353static void teardown_kernel_session(struct ltt_session *session)
fac6795d 354{
8f7a84dd
DG
355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
84ea9c99 357 return;
8f7a84dd
DG
358 }
359
84ea9c99 360 DBG("Tearing down kernel session");
d9800920 361
84ea9c99
MD
362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 368 }
84ea9c99
MD
369
370 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
371}
372
f6a9efaa
DG
373/*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377static void teardown_ust_session(struct ltt_session *session)
378{
84cd17c6
MD
379 int ret;
380
8f7a84dd
DG
381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
f470a390 383 return;
8f7a84dd
DG
384 }
385
84ea9c99 386 DBG("Tearing down UST session(s)");
8f7a84dd 387
84cd17c6
MD
388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
8f7a84dd 392
f6a9efaa
DG
393 trace_ust_destroy_session(session->ust_session);
394}
395
099e26bd
DG
396/*
397 * Stop all threads by closing the thread quit pipe.
398 */
cf3af59e
MD
399static void stop_threads(void)
400{
5eb91c98
DG
401 int ret;
402
cf3af59e
MD
403 /* Stopping all threads */
404 DBG("Terminating all threads");
54d01ffb 405 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
099e26bd
DG
410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
413}
414
fac6795d 415/*
d063d709 416 * Cleanup the daemon
fac6795d 417 */
cf3af59e 418static void cleanup(void)
fac6795d 419{
1d4b027a
DG
420 int ret;
421 char *cmd;
af9737e9 422 struct ltt_session *sess, *stmp;
fac6795d 423
1d4b027a 424 DBG("Cleaning up");
e07ae692 425
5eb91c98
DG
426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
5461b305 432
5eb91c98
DG
433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
1d4b027a 438 }
5461b305 439
1d4b027a 440 DBG("Cleaning up all session");
fac6795d 441
b5541356 442 /* Destroy session list mutex */
273ea72c
DG
443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
54d01ffb
DG
447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
273ea72c 449 teardown_kernel_session(sess);
f6a9efaa
DG
450 teardown_ust_session(sess);
451 free(sess);
273ea72c
DG
452 }
453 }
454
099e26bd 455 DBG("Closing all UST sockets");
56fff090 456 ust_app_clean_list();
099e26bd 457
3bd1e081 458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 459
f3ed775e 460 DBG("Closing kernel fd");
1d4b027a 461 close(kernel_tracer_fd);
ab147185 462
2f50c8a3
DG
463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
5eb91c98
DG
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
421cb601
DG
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
fac6795d
DG
476}
477
e065084a 478/*
d063d709 479 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 480 *
d063d709 481 * Return lttcomm error code.
e065084a
DG
482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
5461b305 493/*
d063d709 494 * Free memory of a command context structure.
5461b305 495 */
a2fb29a5 496static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 497{
a2fb29a5
DG
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
5461b305 502 }
a2fb29a5
DG
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
5461b305 505 }
a2fb29a5
DG
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
5461b305
DG
508 }
509}
510
f3ed775e 511/*
d063d709 512 * Send all stream fds of kernel channel to the consumer.
f3ed775e 513 */
2bdd86d4 514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 515 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
516{
517 int ret;
f3ed775e 518 struct ltt_kernel_stream *stream;
3bd1e081 519 struct lttcomm_consumer_msg lkm;
f3ed775e 520
3bd1e081 521 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 522 channel->channel->name);
f3ed775e 523
3bd1e081
MD
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 531 if (ret < 0) {
3bd1e081 532 perror("send consumer channel");
f3ed775e
DG
533 goto error;
534 }
535
3bd1e081 536 /* Send streams */
7a485870 537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
f3ed775e
DG
559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG
563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG
575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG
580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 617 if (ret < 0) {
3bd1e081 618 perror("send consumer stream");
7a485870
DG
619 goto error;
620 }
621 }
f3ed775e 622
f3ed775e 623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
fac6795d 638/*
0fdd1e2c 639 * Notify UST applications using the shm mmap futex.
fac6795d 640 */
0fdd1e2c 641static int notify_ust_apps(int active)
fac6795d 642{
0fdd1e2c 643 char *wait_shm_mmap;
fac6795d 644
0fdd1e2c 645 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 646
0fdd1e2c
DG
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
fac6795d
DG
650 goto error;
651 }
652
0fdd1e2c
DG
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
fac6795d
DG
658
659error:
0fdd1e2c 660 return -1;
fac6795d
DG
661}
662
e065084a 663/*
d063d709
DG
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
ca95a216 667 *
d063d709 668 * Return total size of the buffer pointed by buf.
ca95a216 669 */
5461b305 670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 671{
f3ed775e 672 int ret, buf_size;
ca95a216 673
f3ed775e 674 buf_size = size;
5461b305 675
ba7f0ae5 676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 677 if (cmd_ctx->llm == NULL) {
ba7f0ae5 678 perror("zmalloc");
5461b305 679 ret = -ENOMEM;
ca95a216
DG
680 goto error;
681 }
682
5461b305
DG
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 686
5461b305
DG
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
ca95a216
DG
690 return buf_size;
691
692error:
693 return ret;
694}
695
7a485870 696/*
5eb91c98 697 * Update the kernel poll set of all channel fd available over all tracing
d063d709 698 * session. Add the wakeup pipe at the end of the set.
7a485870 699 */
5eb91c98 700static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 701{
5eb91c98 702 int ret;
7a485870
DG
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
5eb91c98 706 DBG("Updating kernel poll set");
7a485870 707
54d01ffb 708 session_lock_list();
b5541356 709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 710 session_lock(session);
7a485870 711 if (session->kernel_session == NULL) {
54d01ffb 712 session_unlock(session);
7a485870
DG
713 continue;
714 }
7a485870 715
54d01ffb
DG
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
54d01ffb 721 session_unlock(session);
5eb91c98
DG
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 725 }
54d01ffb 726 session_unlock(session);
7a485870 727 }
54d01ffb 728 session_unlock_list();
7a485870 729
5eb91c98 730 return 0;
7a485870
DG
731
732error:
54d01ffb 733 session_unlock_list();
7a485870
DG
734 return -1;
735}
736
737/*
54d01ffb 738 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 739 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 740 *
d063d709 741 * Useful for CPU hotplug feature.
7a485870 742 */
2bdd86d4 743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
54d01ffb 751 session_lock_list();
b5541356 752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 753 session_lock(session);
7a485870 754 if (session->kernel_session == NULL) {
54d01ffb 755 session_unlock(session);
7a485870
DG
756 continue;
757 }
d9800920
DG
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
762 }
763
5eb91c98
DG
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
7a485870
DG
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
b3c750d2 770 goto error;
7a485870 771 }
d9800920 772
7a485870 773 /*
5eb91c98
DG
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
7a485870 777 */
3bd1e081 778 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 779 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 780 session->kernel_session->consumer_fd, channel);
7a485870 781 if (ret < 0) {
b3c750d2 782 goto error;
7a485870
DG
783 }
784 }
b3c750d2 785 goto error;
7a485870
DG
786 }
787 }
54d01ffb 788 session_unlock(session);
7a485870 789 }
54d01ffb 790 session_unlock_list();
b3c750d2 791 return ret;
7a485870 792
b3c750d2 793error:
54d01ffb
DG
794 session_unlock(session);
795 session_unlock_list();
7a485870
DG
796 return ret;
797}
798
487cf67c
DG
799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
487cf67c
DG
811 }
812}
813
7a485870 814/*
d063d709 815 * This thread manage event coming from the kernel.
7a485870 816 *
d063d709
DG
817 * Features supported in this thread:
818 * -) CPU Hotplug
7a485870
DG
819 */
820static void *thread_manage_kernel(void *data)
821{
5eb91c98
DG
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
7a485870 824 char tmp;
5eb91c98 825 struct lttng_poll_event events;
7a485870
DG
826
827 DBG("Thread manage kernel started");
828
5eb91c98
DG
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
7a485870
DG
839 while (1) {
840 if (update_poll_flag == 1) {
5f822d0a
DG
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
5eb91c98
DG
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
7a485870
DG
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
5eb91c98
DG
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
7a485870
DG
860
861 /* Poll infinite value of time */
5eb91c98 862 ret = lttng_poll_wait(&events, -1);
7a485870 863 if (ret < 0) {
7a485870
DG
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
85611738
DG
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
7a485870
DG
869 continue;
870 }
871
5eb91c98
DG
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 876
5eb91c98
DG
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
7a485870 882
5eb91c98
DG
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
2bdd86d4 894 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
7a485870 903 }
7a485870
DG
904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
273ea72c
DG
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
5eb91c98
DG
912
913 lttng_poll_clean(&events);
914
7a485870
DG
915 return NULL;
916}
917
1d4b027a 918/*
3bd1e081 919 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 920 */
3bd1e081 921static void *thread_manage_consumer(void *data)
1d4b027a 922{
5eb91c98
DG
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
1d4b027a 925 enum lttcomm_return_code code;
5eb91c98 926 struct lttng_poll_event events;
3bd1e081 927 struct consumer_data *consumer_data = data;
1d4b027a 928
3bd1e081 929 DBG("[thread] Manage consumer started");
1d4b027a 930
3bd1e081 931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
932 if (ret < 0) {
933 goto error;
934 }
935
5eb91c98
DG
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
273ea72c 944
3bd1e081 945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
951
952 /* Inifinite blocking call, waiting for transmission */
5eb91c98 953 ret = lttng_poll_wait(&events, -1);
273ea72c 954 if (ret < 0) {
273ea72c
DG
955 goto error;
956 }
957
5eb91c98
DG
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
3bd1e081 970 if (pollfd == consumer_data->err_sock) {
5eb91c98 971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 972 ERR("consumer err socket poll error");
5eb91c98
DG
973 goto error;
974 }
975 }
273ea72c
DG
976 }
977
3bd1e081 978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
979 if (sock < 0) {
980 goto error;
981 }
982
3bd1e081 983 DBG2("Receiving code from consumer err_sock");
ee0b0061 984
712ea556 985 /* Getting status code from kconsumerd */
54d01ffb
DG
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
1d4b027a
DG
988 if (ret <= 0) {
989 goto error;
990 }
991
3bd1e081
MD
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
48842b30 997 PERROR("consumer connect");
1d4b027a
DG
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1d4b027a 1003 } else {
3bd1e081 1004 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
54d01ffb 1009 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1011 if (ret < 0) {
72079cae
DG
1012 goto error;
1013 }
1014
5eb91c98
DG
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
72079cae 1017 goto error;
5eb91c98
DG
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
72079cae
DG
1026 goto error;
1027 }
1028
5eb91c98
DG
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1043 ERR("consumer err socket second poll error");
5eb91c98
DG
1044 goto error;
1045 }
1046 }
1047 }
1048
712ea556 1049 /* Wait for any kconsumerd error */
54d01ffb
DG
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
712ea556 1052 if (ret <= 0) {
3bd1e081 1053 ERR("consumer closed the command socket");
712ea556 1054 goto error;
6f61d021 1055 }
1d4b027a 1056
3bd1e081 1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1058
1d4b027a 1059error:
3bd1e081
MD
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
5eb91c98 1063 close(sock);
273ea72c 1064
3bd1e081
MD
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1d4b027a 1068
5eb91c98 1069 lttng_poll_clean(&events);
0177d773 1070
5eb91c98 1071 return NULL;
099e26bd
DG
1072}
1073
099e26bd
DG
1074/*
1075 * This thread manage application communication.
1d4b027a
DG
1076 */
1077static void *thread_manage_apps(void *data)
099e26bd 1078{
5eb91c98
DG
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
099e26bd 1081 struct ust_command ust_cmd;
5eb91c98 1082 struct lttng_poll_event events;
099e26bd
DG
1083
1084 DBG("[thread] Manage application started");
1085
f6a9efaa
DG
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
5eb91c98
DG
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
099e26bd 1098
5eb91c98
DG
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
0177d773 1102
5eb91c98 1103 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1108 ret = lttng_poll_wait(&events, -1);
099e26bd 1109 if (ret < 0) {
099e26bd
DG
1110 goto error;
1111 }
1112
5eb91c98
DG
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
099e26bd 1121 goto error;
5eb91c98 1122 }
099e26bd 1123
5eb91c98
DG
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
0177d773 1128 goto error;
5eb91c98
DG
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
099e26bd 1136
5eb91c98 1137 /* Register applicaton to the session daemon */
56fff090 1138 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1139 ust_cmd.sock);
88ff5b7f 1140 if (ret == -ENOMEM) {
5eb91c98 1141 goto error;
88ff5b7f
MD
1142 } else if (ret < 0) {
1143 break;
5eb91c98
DG
1144 }
1145
acc7b41b
MD
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
5eb91c98
DG
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
56fff090 1158 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
54d01ffb
DG
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
5eb91c98 1171 }
487cf67c 1172
5eb91c98 1173 break;
0177d773 1174 }
5eb91c98
DG
1175 } else {
1176 /*
54d01ffb
DG
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
5eb91c98
DG
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
099e26bd 1186
b9d9b220 1187 /* Socket closed on remote end. */
56fff090 1188 ust_app_unregister(pollfd);
5eb91c98
DG
1189 break;
1190 }
099e26bd
DG
1191 }
1192 }
099e26bd
DG
1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
5eb91c98 1200 lttng_poll_clean(&events);
099e26bd 1201
f6a9efaa
DG
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
099e26bd
DG
1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
00a17c97 1227 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
2f50c8a3
DG
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1d4b027a 1275{
5eb91c98
DG
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
099e26bd
DG
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1d4b027a 1284
099e26bd 1285 DBG("[thread] Manage application registration started");
1d4b027a
DG
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
5eb91c98
DG
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
273ea72c 1300
5eb91c98
DG
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
273ea72c 1306
1d4b027a 1307 /* Notify all applications to register */
0fdd1e2c
DG
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
0fdd1e2c 1313 }
1d4b027a
DG
1314
1315 while (1) {
1316 DBG("Accepting application registration");
273ea72c 1317
5eb91c98
DG
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
273ea72c 1320 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1321 ret = lttng_poll_wait(&events, -1);
273ea72c 1322 if (ret < 0) {
273ea72c
DG
1323 goto error;
1324 }
1325
5eb91c98
DG
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1330
5eb91c98
DG
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
90014c57
DG
1334 goto error;
1335 }
1d4b027a 1336
5eb91c98
DG
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
099e26bd 1347
5eb91c98 1348 /* Create UST registration command for enqueuing */
ba7f0ae5 1349 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1350 if (ust_cmd == NULL) {
ba7f0ae5 1351 perror("ust command zmalloc");
5eb91c98
DG
1352 goto error;
1353 }
1d4b027a 1354
5eb91c98
DG
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
099e26bd 1371
5eb91c98 1372 ust_cmd->sock = sock;
099e26bd 1373
5eb91c98
DG
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1380
5eb91c98
DG
1381 /*
1382 * Lock free enqueue the registration request. The red pill
54d01ffb 1383 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
90014c57 1394 }
1d4b027a
DG
1395 }
1396
1397error:
0fdd1e2c
DG
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
273ea72c 1405 unlink(apps_unix_sock_path);
0fdd1e2c 1406
5eb91c98
DG
1407 lttng_poll_clean(&events);
1408
1d4b027a
DG
1409 return NULL;
1410}
1411
8c0faa1d 1412/*
3bd1e081 1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1414 * exec or it will fails.
8c0faa1d 1415 */
3bd1e081 1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1417{
1418 int ret;
ee0b0061
DG
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
8c0faa1d
DG
1423
1424 /* Setup semaphore */
3bd1e081 1425 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1426 if (ret < 0) {
3bd1e081 1427 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1428 goto error;
1429 }
8c0faa1d 1430
3bd1e081
MD
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
8c0faa1d 1433 if (ret != 0) {
3bd1e081 1434 PERROR("pthread_create consumer");
ee0b0061 1435 ret = -1;
8c0faa1d
DG
1436 goto error;
1437 }
1438
ee0b0061
DG
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
3bd1e081 1442 PERROR("clock_gettime spawn consumer");
ee0b0061 1443 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1444 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1449 }
8c0faa1d 1450
ee0b0061
DG
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
3bd1e081
MD
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1459 if (ret < 0) {
3bd1e081 1460 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1461 }
1462 } else {
3bd1e081 1463 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1464 }
1465 goto error;
1466 }
1467
3bd1e081
MD
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
712ea556 1470 ERR("Kconsumerd did not start");
3bd1e081 1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1472 goto error;
1473 }
3bd1e081 1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1475
8c0faa1d
DG
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
d9800920 1482/*
3bd1e081 1483 * Join consumer thread
d9800920 1484 */
3bd1e081 1485static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1486{
1487 void *status;
1488 int ret;
1489
3bd1e081
MD
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1492 if (ret) {
3bd1e081 1493 ERR("Error killing consumer daemon");
cf3af59e
MD
1494 return ret;
1495 }
3bd1e081 1496 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1497 } else {
1498 return 0;
1499 }
1500}
1501
8c0faa1d 1502/*
3bd1e081 1503 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1504 *
d063d709 1505 * Return pid if successful else -1.
8c0faa1d 1506 */
3bd1e081 1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1508{
1509 int ret;
1510 pid_t pid;
53086306 1511 const char *verbosity;
8c0faa1d 1512
3bd1e081 1513 DBG("Spawning consumerd");
c49dc785 1514
8c0faa1d
DG
1515 pid = fork();
1516 if (pid == 0) {
1517 /*
3bd1e081 1518 * Exec consumerd.
8c0faa1d 1519 */
3bd1e081 1520 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1521 verbosity = "--verbose";
1522 } else {
1523 verbosity = "--quiet";
1524 }
3bd1e081
MD
1525 switch (consumer_data->type) {
1526 case LTTNG_CONSUMER_KERNEL:
1527 execl(INSTALL_BIN_PATH "/lttng-consumerd",
7753dea8
MD
1528 "lttng-consumerd", verbosity, "-k",
1529 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1530 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1531 NULL);
3bd1e081 1532 break;
7753dea8
MD
1533 case LTTNG_CONSUMER64_UST:
1534 {
b1e0b6b6 1535 char *tmpnew = NULL;
8f4905da
MD
1536
1537 if (consumerd64_libdir[0] != '\0') {
1538 char *tmp;
1539 size_t tmplen;
1540
1541 tmp = getenv("LD_LIBRARY_PATH");
1542 if (!tmp) {
1543 tmp = "";
1544 }
1545 tmplen = strlen("LD_LIBRARY_PATH=")
1546 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1547 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1548 if (!tmpnew) {
1549 ret = -ENOMEM;
1550 goto error;
1551 }
1552 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1553 strcat(tmpnew, consumerd64_libdir);
1554 if (tmp[0] != '\0') {
1555 strcat(tmpnew, ":");
1556 strcat(tmpnew, tmp);
1557 }
1558 ret = putenv(tmpnew);
1559 if (ret) {
1560 ret = -errno;
1561 goto error;
1562 }
1563 }
1564 ret = execl(consumerd64_path, verbosity, "-u",
7753dea8
MD
1565 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1566 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1567 NULL);
8f4905da
MD
1568 if (consumerd64_libdir[0] != '\0') {
1569 free(tmpnew);
1570 }
1571 if (ret) {
1572 goto error;
1573 }
3bd1e081 1574 break;
7753dea8
MD
1575 }
1576 case LTTNG_CONSUMER32_UST:
1577 {
937dde8e 1578 char *tmpnew = NULL;
8f4905da
MD
1579
1580 if (consumerd32_libdir[0] != '\0') {
1581 char *tmp;
1582 size_t tmplen;
1583
1584 tmp = getenv("LD_LIBRARY_PATH");
1585 if (!tmp) {
1586 tmp = "";
1587 }
1588 tmplen = strlen("LD_LIBRARY_PATH=")
1589 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1590 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1591 if (!tmpnew) {
1592 ret = -ENOMEM;
1593 goto error;
1594 }
1595 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1596 strcat(tmpnew, consumerd32_libdir);
1597 if (tmp[0] != '\0') {
1598 strcat(tmpnew, ":");
1599 strcat(tmpnew, tmp);
1600 }
1601 ret = putenv(tmpnew);
1602 if (ret) {
1603 ret = -errno;
1604 goto error;
1605 }
1606 }
1607 ret = execl(consumerd32_path, verbosity, "-u",
7753dea8
MD
1608 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1609 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1610 NULL);
8f4905da
MD
1611 if (consumerd32_libdir[0] != '\0') {
1612 free(tmpnew);
1613 }
1614 if (ret) {
1615 goto error;
1616 }
7753dea8
MD
1617 break;
1618 }
3bd1e081
MD
1619 default:
1620 perror("unknown consumer type");
1621 exit(EXIT_FAILURE);
1622 }
8c0faa1d
DG
1623 if (errno != 0) {
1624 perror("kernel start consumer exec");
1625 }
1626 exit(EXIT_FAILURE);
1627 } else if (pid > 0) {
1628 ret = pid;
8c0faa1d 1629 } else {
3bd1e081 1630 perror("start consumer fork");
8c0faa1d 1631 ret = -errno;
8c0faa1d 1632 }
8f4905da 1633error:
8c0faa1d
DG
1634 return ret;
1635}
1636
693bd40b 1637/*
3bd1e081 1638 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1639 */
3bd1e081 1640static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1641{
1642 int ret;
1643
3bd1e081
MD
1644 pthread_mutex_lock(&consumer_data->pid_mutex);
1645 if (consumer_data->pid != 0) {
1646 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1647 goto end;
1648 }
693bd40b 1649
3bd1e081 1650 ret = spawn_consumerd(consumer_data);
c49dc785 1651 if (ret < 0) {
3bd1e081
MD
1652 ERR("Spawning consumerd failed");
1653 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1654 goto error;
693bd40b 1655 }
c49dc785 1656
3bd1e081
MD
1657 /* Setting up the consumer_data pid */
1658 consumer_data->pid = ret;
48842b30 1659 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1660 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1661
3bd1e081
MD
1662 DBG2("Spawning consumer control thread");
1663 ret = spawn_consumer_thread(consumer_data);
693bd40b 1664 if (ret < 0) {
3bd1e081 1665 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1666 goto error;
1667 }
1668
c49dc785 1669end:
693bd40b
DG
1670 return 0;
1671
1672error:
1673 return ret;
1674}
1675
b73401da 1676/*
d063d709 1677 * modprobe_kernel_modules
b73401da
DG
1678 */
1679static int modprobe_kernel_modules(void)
1680{
ab147185 1681 int ret = 0, i;
b73401da
DG
1682 char modprobe[256];
1683
ab147185
MD
1684 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1685 ret = snprintf(modprobe, sizeof(modprobe),
1686 "/sbin/modprobe %s%s",
24b487b8 1687 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1688 kernel_modules_list[i].name);
b73401da
DG
1689 if (ret < 0) {
1690 perror("snprintf modprobe");
1691 goto error;
1692 }
ab147185 1693 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1694 ret = system(modprobe);
ab147185
MD
1695 if (ret == -1) {
1696 ERR("Unable to launch modprobe for module %s",
1697 kernel_modules_list[i].name);
1698 } else if (kernel_modules_list[i].required
d9800920 1699 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1700 ERR("Unable to load module %s",
1701 kernel_modules_list[i].name);
1702 } else {
1703 DBG("Modprobe successfully %s",
1704 kernel_modules_list[i].name);
1705 }
1706 }
1707
1708error:
1709 return ret;
1710}
1711
b73401da 1712/*
d063d709 1713 * mount_debugfs
b73401da
DG
1714 */
1715static int mount_debugfs(char *path)
1716{
1717 int ret;
1718 char *type = "debugfs";
1719
996b65c8 1720 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1721 if (ret < 0) {
7272acf5 1722 PERROR("Cannot create debugfs path");
b73401da
DG
1723 goto error;
1724 }
1725
1726 ret = mount(type, path, type, 0, NULL);
1727 if (ret < 0) {
7272acf5 1728 PERROR("Cannot mount debugfs");
b73401da
DG
1729 goto error;
1730 }
1731
1732 DBG("Mounted debugfs successfully at %s", path);
1733
1734error:
1735 return ret;
1736}
1737
8c0faa1d 1738/*
d063d709 1739 * Setup necessary data for kernel tracer action.
8c0faa1d 1740 */
f3ed775e 1741static void init_kernel_tracer(void)
8c0faa1d 1742{
b73401da
DG
1743 int ret;
1744 char *proc_mounts = "/proc/mounts";
1745 char line[256];
684d34d2 1746 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1747 FILE *fp;
1748
1749 /* Detect debugfs */
1750 fp = fopen(proc_mounts, "r");
1751 if (fp == NULL) {
1752 ERR("Unable to probe %s", proc_mounts);
1753 goto error;
1754 }
1755
1756 while (fgets(line, sizeof(line), fp) != NULL) {
1757 if (strstr(line, "debugfs") != NULL) {
1758 /* Remove first string */
1759 strtok(line, " ");
1760 /* Dup string here so we can reuse line later on */
1761 debugfs_path = strdup(strtok(NULL, " "));
1762 DBG("Got debugfs path : %s", debugfs_path);
1763 break;
1764 }
1765 }
1766
1767 fclose(fp);
1768
1769 /* Mount debugfs if needded */
1770 if (debugfs_path == NULL) {
1771 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1772 if (ret < 0) {
1773 perror("asprintf debugfs path");
1774 goto error;
1775 }
1776 ret = mount_debugfs(debugfs_path);
1777 if (ret < 0) {
7272acf5 1778 perror("Cannot mount debugfs");
b73401da
DG
1779 goto error;
1780 }
1781 }
1782
1783 /* Modprobe lttng kernel modules */
1784 ret = modprobe_kernel_modules();
1785 if (ret < 0) {
1786 goto error;
1787 }
1788
1789 /* Setup lttng kernel path */
1790 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1791 if (ret < 0) {
1792 perror("asprintf lttng path");
1793 goto error;
1794 }
1795
1796 /* Open debugfs lttng */
1797 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1798 if (kernel_tracer_fd < 0) {
b73401da
DG
1799 DBG("Failed to open %s", lttng_path);
1800 goto error;
8c0faa1d
DG
1801 }
1802
b73401da
DG
1803 free(lttng_path);
1804 free(debugfs_path);
f3ed775e 1805 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1806 return;
1807
1808error:
1809 if (lttng_path) {
1810 free(lttng_path);
1811 }
1812 if (debugfs_path) {
1813 free(debugfs_path);
1814 }
1815 WARN("No kernel tracer available");
1816 kernel_tracer_fd = 0;
1817 return;
f3ed775e 1818}
33a2b854 1819
f3ed775e 1820/*
54d01ffb 1821 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1822 */
54d01ffb 1823static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1824{
f40799e8 1825 int ret = 0;
8c0faa1d 1826
3bd1e081 1827 if (session->consumer_fds_sent == 0) {
d9800920 1828 /*
54d01ffb
DG
1829 * Assign default kernel consumer socket if no consumer assigned to the
1830 * kernel session. At this point, it's NOT suppose to be 0 but this is
1831 * an extra security check.
d9800920
DG
1832 */
1833 if (session->consumer_fd == 0) {
3bd1e081 1834 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1835 }
1836
2bdd86d4 1837 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1838 if (ret < 0) {
f3ed775e
DG
1839 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1840 goto error;
1841 }
1d4b027a 1842
3bd1e081 1843 session->consumer_fds_sent = 1;
f3ed775e 1844 }
1d4b027a
DG
1845
1846error:
1847 return ret;
8c0faa1d
DG
1848}
1849
0177d773
DG
1850/*
1851 * Create an UST session and add it to the session ust list.
1852 */
44d3bd01
DG
1853static int create_ust_session(struct ltt_session *session,
1854 struct lttng_domain *domain)
0177d773 1855{
44d3bd01 1856 int ret;
48842b30 1857 unsigned int uid;
13384287 1858 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1859
1860 switch (domain->type) {
48842b30 1861 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1862 break;
1863 default:
13384287 1864 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1865 goto error;
1866 }
0177d773
DG
1867
1868 DBG("Creating UST session");
1869
44e96653 1870 uid = session->uid;
48842b30 1871 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1872 if (lus == NULL) {
44d3bd01 1873 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1874 goto error;
1875 }
1876
48842b30 1877 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1878 geteuid(), allowed_group());
1879 if (ret < 0) {
1880 if (ret != -EEXIST) {
1881 ERR("Trace directory creation error");
44d3bd01 1882 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1883 goto error;
1884 }
1885 }
1886
f6a9efaa
DG
1887 /* The domain type dictate different actions on session creation */
1888 switch (domain->type) {
48842b30
DG
1889 case LTTNG_DOMAIN_UST:
1890 /* No ustctl for the global UST domain */
1891 break;
1892 default:
36dc12cc 1893 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1894 goto error;
0177d773 1895 }
f6a9efaa 1896 session->ust_session = lus;
44d3bd01
DG
1897
1898 return LTTCOMM_OK;
0177d773
DG
1899
1900error:
1901 free(lus);
1902 return ret;
1903}
1904
333f285e 1905/*
d063d709 1906 * Create a kernel tracer session then create the default channel.
333f285e 1907 */
f3ed775e 1908static int create_kernel_session(struct ltt_session *session)
333f285e 1909{
f3ed775e 1910 int ret;
f3ed775e
DG
1911
1912 DBG("Creating kernel session");
1913
1914 ret = kernel_create_session(session, kernel_tracer_fd);
1915 if (ret < 0) {
1916 ret = LTTCOMM_KERN_SESS_FAIL;
1917 goto error;
333f285e
DG
1918 }
1919
d9800920 1920 /* Set kernel consumer socket fd */
3bd1e081
MD
1921 if (kconsumer_data.cmd_sock) {
1922 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1923 }
1924
63053e7c
DG
1925 ret = mkdir_recursive(session->kernel_session->trace_path,
1926 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1927 if (ret < 0) {
996b65c8 1928 if (ret != -EEXIST) {
7a485870
DG
1929 ERR("Trace directory creation error");
1930 goto error;
1931 }
1932 }
1933
f3ed775e
DG
1934error:
1935 return ret;
333f285e
DG
1936}
1937
6c9cc2ab
DG
1938/*
1939 * Using the session list, filled a lttng_session array to send back to the
1940 * client for session listing.
1941 *
1942 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1943 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1944 */
1945static void list_lttng_sessions(struct lttng_session *sessions)
1946{
1947 int i = 0;
1948 struct ltt_session *session;
1949
1950 DBG("Getting all available session");
1951 /*
1952 * Iterate over session list and append data after the control struct in
1953 * the buffer.
1954 */
1955 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1956 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1957 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1958 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1959 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1960 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1961 i++;
1962 }
1963}
1964
9f19cc17
DG
1965/*
1966 * Fill lttng_channel array of all channels.
1967 */
b551a063 1968static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1969 struct lttng_channel *channels)
1970{
1971 int i = 0;
1972 struct ltt_kernel_channel *kchan;
1973
1974 DBG("Listing channels for session %s", session->name);
1975
b551a063
DG
1976 switch (domain) {
1977 case LTTNG_DOMAIN_KERNEL:
1978 /* Kernel channels */
1979 if (session->kernel_session != NULL) {
1980 cds_list_for_each_entry(kchan,
1981 &session->kernel_session->channel_list.head, list) {
1982 /* Copy lttng_channel struct to array */
1983 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1984 channels[i].enabled = kchan->enabled;
1985 i++;
1986 }
1987 }
1988 break;
1989 case LTTNG_DOMAIN_UST:
1990 {
1991 struct cds_lfht_iter iter;
1992 struct ltt_ust_channel *uchan;
1993
1994 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1995 &iter, uchan, node) {
1996 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1997 channels[i].attr.overwrite = uchan->attr.overwrite;
1998 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1999 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2000 channels[i].attr.switch_timer_interval =
2001 uchan->attr.switch_timer_interval;
2002 channels[i].attr.read_timer_interval =
2003 uchan->attr.read_timer_interval;
aea829b3 2004 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2005 switch (uchan->attr.output) {
2006 case LTTNG_UST_MMAP:
2007 default:
2008 channels[i].attr.output = LTTNG_EVENT_MMAP;
2009 break;
2010 }
befe0905 2011 i++;
b551a063
DG
2012 }
2013 break;
2014 }
2015 default:
2016 break;
2017 }
2018}
2019
2020/*
2021 * Create a list of ust global domain events.
2022 */
2023static int list_lttng_ust_global_events(char *channel_name,
2024 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2025{
2026 int i = 0, ret = 0;
2027 unsigned int nb_event = 0;
2028 struct cds_lfht_iter iter;
d7b75b30 2029 struct cds_lfht_node *node;
b551a063
DG
2030 struct ltt_ust_channel *uchan;
2031 struct ltt_ust_event *uevent;
2032 struct lttng_event *tmp;
2033
2034 DBG("Listing UST global events for channel %s", channel_name);
2035
2036 rcu_read_lock();
2037
d7b75b30
DG
2038 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2039 strlen(channel_name), &iter);
2040 if (node == NULL) {
2041 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2042 goto error;
b551a063
DG
2043 }
2044
d7b75b30
DG
2045 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2046
2047 nb_event += hashtable_get_count(uchan->events);
2048
b551a063
DG
2049 if (nb_event == 0) {
2050 ret = nb_event;
2051 goto error;
2052 }
2053
2054 DBG3("Listing UST global %d events", nb_event);
2055
2056 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2057 if (tmp == NULL) {
2058 ret = -LTTCOMM_FATAL;
2059 goto error;
2060 }
2061
d7b75b30
DG
2062 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2063 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2064 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2065 tmp[i].enabled = uevent->enabled;
2066 switch (uevent->attr.instrumentation) {
2067 case LTTNG_UST_TRACEPOINT:
2068 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2069 break;
2070 case LTTNG_UST_PROBE:
2071 tmp[i].type = LTTNG_EVENT_PROBE;
2072 break;
2073 case LTTNG_UST_FUNCTION:
2074 tmp[i].type = LTTNG_EVENT_FUNCTION;
2075 break;
ac3bd9c0
MD
2076 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2077 /* TODO */
2078 ret = -LTTCOMM_NOT_IMPLEMENTED;
2079 goto error;
2080 break;
9f19cc17 2081 }
d7b75b30 2082 i++;
9f19cc17
DG
2083 }
2084
b551a063
DG
2085 ret = nb_event;
2086 *events = tmp;
2087
2088error:
2089 rcu_read_unlock();
2090 return ret;
9f19cc17
DG
2091}
2092
2093/*
b551a063 2094 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2095 */
b551a063
DG
2096static int list_lttng_kernel_events(char *channel_name,
2097 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2098{
b551a063
DG
2099 int i = 0, ret;
2100 unsigned int nb_event;
9f19cc17 2101 struct ltt_kernel_event *event;
b551a063
DG
2102 struct ltt_kernel_channel *kchan;
2103
2104 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2105 if (kchan == NULL) {
2106 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2107 goto error;
2108 }
2109
2110 nb_event = kchan->event_count;
9f19cc17
DG
2111
2112 DBG("Listing events for channel %s", kchan->channel->name);
2113
b551a063
DG
2114 if (nb_event == 0) {
2115 ret = nb_event;
2116 goto error;
2117 }
2118
2119 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2120 if (*events == NULL) {
2121 ret = LTTCOMM_FATAL;
2122 goto error;
2123 }
2124
9f19cc17
DG
2125 /* Kernel channels */
2126 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2127 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2128 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2129 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2130 switch (event->event->instrumentation) {
2131 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2132 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2133 break;
2134 case LTTNG_KERNEL_KPROBE:
2135 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2136 (*events)[i].type = LTTNG_EVENT_PROBE;
2137 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2138 sizeof(struct lttng_kernel_kprobe));
2139 break;
2140 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2141 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2142 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2143 sizeof(struct lttng_kernel_function));
2144 break;
0133c199 2145 case LTTNG_KERNEL_NOOP:
b551a063 2146 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2147 break;
a54bd42d 2148 case LTTNG_KERNEL_SYSCALL:
b551a063 2149 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2150 break;
7a3d1328
MD
2151 case LTTNG_KERNEL_ALL:
2152 assert(0);
2153 break;
9f19cc17
DG
2154 }
2155 i++;
2156 }
b551a063
DG
2157
2158 return nb_event;
2159
2160error:
2161 return ret;
9f19cc17
DG
2162}
2163
fac6795d 2164/*
54d01ffb 2165 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2166 */
54d01ffb
DG
2167static int cmd_disable_channel(struct ltt_session *session,
2168 int domain, char *channel_name)
fac6795d 2169{
54d01ffb 2170 int ret;
78f0bacd
DG
2171 struct ltt_ust_session *usess;
2172
2173 usess = session->ust_session;
379473d2 2174
54d01ffb 2175 switch (domain) {
78f0bacd
DG
2176 case LTTNG_DOMAIN_KERNEL:
2177 {
2178 ret = channel_kernel_disable(session->kernel_session,
2179 channel_name);
2180 if (ret != LTTCOMM_OK) {
2181 goto error;
2182 }
54d01ffb 2183
78f0bacd
DG
2184 kernel_wait_quiescent(kernel_tracer_fd);
2185 break;
2186 }
2187 case LTTNG_DOMAIN_UST:
2188 {
2189 struct ltt_ust_channel *uchan;
2190
2191 /* Get channel in global UST domain HT */
2192 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2193 channel_name);
2194 if (uchan == NULL) {
2195 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2196 goto error;
78f0bacd
DG
2197 }
2198
8535a6d9
DG
2199 /* Already disabled */
2200 if (!uchan->enabled) {
2201 DBG2("UST channel %s already disabled", channel_name);
2202 break;
2203 }
2204
35a9059d 2205 ret = ust_app_disable_channel_glb(usess, uchan);
78f0bacd
DG
2206 if (ret < 0) {
2207 ret = LTTCOMM_UST_DISABLE_FAIL;
2208 goto error;
2209 }
2210
2211 uchan->enabled = 0;
2212
2213 break;
2214 }
2215 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2216 case LTTNG_DOMAIN_UST_EXEC_NAME:
2217 case LTTNG_DOMAIN_UST_PID:
2218 ret = LTTCOMM_NOT_IMPLEMENTED;
2219 goto error;
2220 default:
2221 ret = LTTCOMM_UNKNOWN_DOMAIN;
2222 goto error;
20fe2104
DG
2223 }
2224
54d01ffb 2225 ret = LTTCOMM_OK;
d65106b1 2226
54d01ffb
DG
2227error:
2228 return ret;
2229}
2230
56fff090
DG
2231/*
2232 * Copy channel from attributes and set it in the application channel list.
2233 */
f6a9efaa 2234/*
56fff090
DG
2235static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2236 struct lttng_channel *attr, struct ust_app *app)
2237{
2238 int ret;
2239 struct ltt_ust_channel *uchan, *new_chan;
2240
f6a9efaa 2241 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2242 if (uchan == NULL) {
2243 ret = LTTCOMM_FATAL;
2244 goto error;
2245 }
2246
2247 new_chan = trace_ust_create_channel(attr, usess->path);
2248 if (new_chan == NULL) {
2249 PERROR("malloc ltt_ust_channel");
2250 ret = LTTCOMM_FATAL;
2251 goto error;
2252 }
2253
2254 ret = channel_ust_copy(new_chan, uchan);
2255 if (ret < 0) {
2256 ret = LTTCOMM_FATAL;
2257 goto error;
2258 }
2259
56fff090
DG
2260error:
2261 return ret;
2262}
f6a9efaa 2263*/
56fff090 2264
54d01ffb
DG
2265/*
2266 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2267 */
44d3bd01 2268static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2269 int domain, struct lttng_channel *attr)
54d01ffb
DG
2270{
2271 int ret;
f6a9efaa
DG
2272 struct ltt_ust_session *usess = session->ust_session;
2273
5d56b5aa 2274 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2275
aea829b3 2276 switch (domain) {
44d3bd01
DG
2277 case LTTNG_DOMAIN_KERNEL:
2278 {
2279 struct ltt_kernel_channel *kchan;
54d01ffb 2280
44d3bd01
DG
2281 kchan = trace_kernel_get_channel_by_name(attr->name,
2282 session->kernel_session);
2283 if (kchan == NULL) {
2284 ret = channel_kernel_create(session->kernel_session,
2285 attr, kernel_poll_pipe[1]);
2286 } else {
2287 ret = channel_kernel_enable(session->kernel_session, kchan);
2288 }
2289
2290 if (ret != LTTCOMM_OK) {
2291 goto error;
2292 }
2293
2294 kernel_wait_quiescent(kernel_tracer_fd);
2295 break;
2296 }
f6a9efaa
DG
2297 case LTTNG_DOMAIN_UST:
2298 {
2299 struct ltt_ust_channel *uchan;
2300
48842b30 2301 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2302
48842b30 2303 /* Get channel in global UST domain HT */
f6a9efaa
DG
2304 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2305 attr->name);
2306 if (uchan == NULL) {
48842b30 2307 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2308 if (uchan == NULL) {
2309 ret = LTTCOMM_UST_CHAN_FAIL;
2310 goto error;
2311 }
d5cd1f34 2312
78f0bacd 2313 /* Add channel to all registered applications */
35a9059d 2314 ret = ust_app_create_channel_glb(usess, uchan);
78f0bacd
DG
2315 if (ret != 0) {
2316 ret = LTTCOMM_UST_CHAN_FAIL;
2317 goto error;
2318 }
8535a6d9
DG
2319
2320 rcu_read_lock();
2321 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2322 rcu_read_unlock();
2323
2324 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa 2325 } else {
78f0bacd
DG
2326 /* If already enabled, everything is OK */
2327 if (uchan->enabled) {
8535a6d9 2328 break;
78f0bacd 2329 }
f6a9efaa 2330
35a9059d 2331 ret = ust_app_enable_channel_glb(usess, uchan);
78f0bacd 2332 if (ret < 0) {
8535a6d9
DG
2333 if (ret != -EEXIST) {
2334 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2335 goto error;
2336 } else {
2337 ret = LTTCOMM_OK;
2338 }
78f0bacd 2339 }
48842b30 2340 }
f6a9efaa 2341
37357452
DG
2342 uchan->enabled = 1;
2343
f6a9efaa
DG
2344 break;
2345 }
78f0bacd
DG
2346 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2347 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2348 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG
2349 ret = LTTCOMM_NOT_IMPLEMENTED;
2350 goto error;
44d3bd01
DG
2351 default:
2352 ret = LTTCOMM_UNKNOWN_DOMAIN;
2353 goto error;
54d01ffb
DG
2354 }
2355
2356 ret = LTTCOMM_OK;
2357
2358error:
2359 return ret;
2360}
2361
2362/*
2363 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2364 */
2365static int cmd_disable_event(struct ltt_session *session, int domain,
2366 char *channel_name, char *event_name)
2367{
2368 int ret;
54d01ffb
DG
2369
2370 switch (domain) {
2371 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2372 {
2373 struct ltt_kernel_channel *kchan;
b0a40d28 2374 struct ltt_kernel_session *ksess;
2bdd86d4 2375
b0a40d28
DG
2376 ksess = session->kernel_session;
2377
2378 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2379 if (kchan == NULL) {
2380 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2381 goto error;
d65106b1
DG
2382 }
2383
b0a40d28 2384 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2385 if (ret != LTTCOMM_OK) {
2386 goto error;
2387 }
2388
2389 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2390 break;
2bdd86d4
MD
2391 }
2392 case LTTNG_DOMAIN_UST:
b0a40d28
DG
2393 {
2394 struct ltt_ust_session *usess;
2395 struct ltt_ust_channel *uchan;
35a9059d 2396 struct ltt_ust_event *uevent;
b0a40d28
DG
2397
2398 usess = session->ust_session;
2399
2400 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2401 channel_name);
2402 if (uchan == NULL) {
2403 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2404 goto error;
2405 }
2406
35a9059d
DG
2407 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2408 if (uevent == NULL) {
2409 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2410 goto error;
2411 }
2412
2413 ret = ust_app_disable_event_glb(usess, uchan, uevent);
b0a40d28
DG
2414 if (ret < 0) {
2415 ret = LTTCOMM_UST_DISABLE_FAIL;
2416 goto error;
2417 }
2418
35a9059d
DG
2419 uevent->enabled = 0;
2420
b0a40d28
DG
2421 DBG2("Disable UST event %s in channel %s completed", event_name,
2422 channel_name);
2423
2424 break;
2425 }
2bdd86d4
MD
2426 case LTTNG_DOMAIN_UST_EXEC_NAME:
2427 case LTTNG_DOMAIN_UST_PID:
2428 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2429 default:
54d01ffb
DG
2430 ret = LTTCOMM_NOT_IMPLEMENTED;
2431 goto error;
d65106b1 2432 }
26cc6b4e 2433
54d01ffb
DG
2434 ret = LTTCOMM_OK;
2435
2436error:
2437 return ret;
2438}
2439
2440/*
2441 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2442 */
2443static int cmd_disable_event_all(struct ltt_session *session, int domain,
2444 char *channel_name)
2445{
2446 int ret;
54d01ffb
DG
2447
2448 switch (domain) {
2449 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2450 {
2451 struct ltt_kernel_session *ksess;
2452 struct ltt_kernel_channel *kchan;
2453
2454 ksess = session->kernel_session;
2455
2456 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2457 if (kchan == NULL) {
2458 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2459 goto error;
26cc6b4e
DG
2460 }
2461
9730260e 2462 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2463 if (ret != LTTCOMM_OK) {
0b97ec54 2464 goto error;
26cc6b4e
DG
2465 }
2466
54d01ffb 2467 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2468 break;
9730260e
DG
2469 }
2470 case LTTNG_DOMAIN_UST:
2471 {
2472 struct ltt_ust_session *usess;
2473 struct ltt_ust_channel *uchan;
2474
2475 usess = session->ust_session;
2476
2477 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2478 channel_name);
2479 if (uchan == NULL) {
2480 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2481 goto error;
2482 }
2483
35a9059d 2484 ret = ust_app_disable_all_event_glb(usess, uchan);
9730260e
DG
2485 if (ret < 0) {
2486 ret = LTTCOMM_UST_DISABLE_FAIL;
2487 goto error;
2488 }
2489
2490 DBG2("Disable all UST event in channel %s completed", channel_name);
2491
2492 break;
2493 }
2494 case LTTNG_DOMAIN_UST_EXEC_NAME:
2495 case LTTNG_DOMAIN_UST_PID:
2496 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2497 default:
54d01ffb
DG
2498 ret = LTTCOMM_NOT_IMPLEMENTED;
2499 goto error;
26cc6b4e 2500 }
e953ef25 2501
54d01ffb 2502 ret = LTTCOMM_OK;
e953ef25 2503
54d01ffb
DG
2504error:
2505 return ret;
2506}
f5177a38 2507
54d01ffb
DG
2508/*
2509 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2510 */
2511static int cmd_add_context(struct ltt_session *session, int domain,
2512 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2513{
2514 int ret;
f5177a38 2515
54d01ffb
DG
2516 switch (domain) {
2517 case LTTNG_DOMAIN_KERNEL:
2518 /* Add kernel context to kernel tracer */
2519 ret = context_kernel_add(session->kernel_session, ctx,
2520 event_name, channel_name);
2521 if (ret != LTTCOMM_OK) {
f5177a38 2522 goto error;
e953ef25 2523 }
2bdd86d4
MD
2524 break;
2525 case LTTNG_DOMAIN_UST:
2526 {
55cc08a6 2527 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2528
55cc08a6
DG
2529 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2530 if (ret != LTTCOMM_OK) {
2531 goto error;
2bdd86d4 2532 }
e953ef25 2533 break;
2bdd86d4 2534 }
55cc08a6
DG
2535 case LTTNG_DOMAIN_UST_EXEC_NAME:
2536 case LTTNG_DOMAIN_UST_PID:
2537 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2538 default:
54d01ffb
DG
2539 ret = LTTCOMM_NOT_IMPLEMENTED;
2540 goto error;
e953ef25 2541 }
950131af 2542
54d01ffb 2543 ret = LTTCOMM_OK;
950131af 2544
54d01ffb
DG
2545error:
2546 return ret;
2547}
2548
2549/*
2550 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2551 */
2552static int cmd_enable_event(struct ltt_session *session, int domain,
2553 char *channel_name, struct lttng_event *event)
2554{
2555 int ret;
f6cd6b0f 2556 struct lttng_channel *attr;
48842b30 2557 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2558
2559 switch (domain) {
2560 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2561 {
2562 struct ltt_kernel_channel *kchan;
2563
54d01ffb
DG
2564 kchan = trace_kernel_get_channel_by_name(channel_name,
2565 session->kernel_session);
2566 if (kchan == NULL) {
f6cd6b0f
DG
2567 attr = channel_new_default_attr(domain);
2568 if (attr == NULL) {
2569 ret = LTTCOMM_FATAL;
2570 goto error;
2571 }
2572 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2573
54d01ffb 2574 /* This call will notify the kernel thread */
44d3bd01 2575 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2576 attr, kernel_poll_pipe[1]);
54d01ffb 2577 if (ret != LTTCOMM_OK) {
ff4d74e6 2578 free(attr);
f5177a38
DG
2579 goto error;
2580 }
ff4d74e6 2581 free(attr);
54d01ffb 2582 }
950131af 2583
54d01ffb
DG
2584 /* Get the newly created kernel channel pointer */
2585 kchan = trace_kernel_get_channel_by_name(channel_name,
2586 session->kernel_session);
2587 if (kchan == NULL) {
2588 /* This sould not happen... */
2589 ret = LTTCOMM_FATAL;
2590 goto error;
2591 }
f5177a38 2592
48842b30
DG
2593 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2594 event);
54d01ffb 2595 if (ret != LTTCOMM_OK) {
f5177a38 2596 goto error;
950131af
DG
2597 }
2598
54d01ffb 2599 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2600 break;
2bdd86d4
MD
2601 }
2602 case LTTNG_DOMAIN_UST:
2603 {
aea829b3 2604 struct lttng_channel *attr;
edb67388 2605 struct ltt_ust_channel *uchan;
2bdd86d4 2606
edb67388 2607 /* Get channel from global UST domain */
48842b30
DG
2608 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2609 channel_name);
2610 if (uchan == NULL) {
aea829b3
DG
2611 /* Create default channel */
2612 attr = channel_new_default_attr(domain);
2613 if (attr == NULL) {
2614 ret = LTTCOMM_FATAL;
2615 goto error;
2616 }
596219f7 2617 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2618 attr->name[NAME_MAX - 1] = '\0';
aea829b3
DG
2619
2620 /* Use the internal command enable channel */
2621 ret = cmd_enable_channel(session, domain, attr);
edb67388 2622 if (ret != LTTCOMM_OK) {
ff4d74e6 2623 free(attr);
aea829b3
DG
2624 goto error;
2625 }
aea829b3
DG
2626 free(attr);
2627
2628 /* Get the newly created channel reference back */
2629 uchan = trace_ust_find_channel_by_name(
2630 usess->domain_global.channels, channel_name);
2631 if (uchan == NULL) {
2632 /* Something is really wrong */
2633 ret = LTTCOMM_FATAL;
2634 goto error;
2635 }
48842b30 2636 }
2bdd86d4 2637
edb67388 2638 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2639
edb67388
DG
2640 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2641 if (ret != LTTCOMM_OK) {
48842b30 2642 goto error;
2bdd86d4
MD
2643 }
2644 break;
2645 }
2646 case LTTNG_DOMAIN_UST_EXEC_NAME:
2647 case LTTNG_DOMAIN_UST_PID:
2648 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2649 default:
54d01ffb
DG
2650 ret = LTTCOMM_NOT_IMPLEMENTED;
2651 goto error;
950131af 2652 }
d36b8583 2653
54d01ffb 2654 ret = LTTCOMM_OK;
d36b8583 2655
54d01ffb
DG
2656error:
2657 return ret;
2658}
7d29a247 2659
54d01ffb
DG
2660/*
2661 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2662 */
2663static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2664 char *channel_name, int event_type)
54d01ffb
DG
2665{
2666 int ret;
2667 struct ltt_kernel_channel *kchan;
7d29a247 2668
54d01ffb
DG
2669 switch (domain) {
2670 case LTTNG_DOMAIN_KERNEL:
2671 kchan = trace_kernel_get_channel_by_name(channel_name,
2672 session->kernel_session);
2673 if (kchan == NULL) {
2674 /* This call will notify the kernel thread */
44d3bd01
DG
2675 ret = channel_kernel_create(session->kernel_session, NULL,
2676 kernel_poll_pipe[1]);
54d01ffb
DG
2677 if (ret != LTTCOMM_OK) {
2678 goto error;
d36b8583 2679 }
54d01ffb 2680 }
0d0c377a 2681
54d01ffb
DG
2682 /* Get the newly created kernel channel pointer */
2683 kchan = trace_kernel_get_channel_by_name(channel_name,
2684 session->kernel_session);
2685 if (kchan == NULL) {
2686 /* This sould not happen... */
2687 ret = LTTCOMM_FATAL;
2688 goto error;
2689 }
0fdd1e2c 2690
7a3d1328
MD
2691 switch (event_type) {
2692 case LTTNG_KERNEL_SYSCALL:
2693 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2694 kchan, kernel_tracer_fd);
7a3d1328
MD
2695 break;
2696 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2697 /*
7a3d1328
MD
2698 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2699 * events already registered to the channel.
8c9ae521 2700 */
7a3d1328
MD
2701 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2702 kchan, kernel_tracer_fd);
2703 break;
2704 case LTTNG_KERNEL_ALL:
2705 /* Enable syscalls and tracepoints */
8c9ae521
DG
2706 ret = event_kernel_enable_all(session->kernel_session,
2707 kchan, kernel_tracer_fd);
7a3d1328
MD
2708 break;
2709 default:
2710 ret = LTTCOMM_KERN_ENABLE_FAIL;
2711 goto error;
8c9ae521 2712 }
54d01ffb 2713 if (ret != LTTCOMM_OK) {
0d0c377a 2714 goto error;
d36b8583
DG
2715 }
2716
54d01ffb 2717 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2718 break;
54d01ffb
DG
2719 default:
2720 /* TODO: Userspace tracing */
2721 ret = LTTCOMM_NOT_IMPLEMENTED;
2722 goto error;
d36b8583 2723 }
f3ed775e 2724
54d01ffb
DG
2725 ret = LTTCOMM_OK;
2726
2727error:
2728 return ret;
2729}
2730
2731/*
2732 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2733 */
2734static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2735{
2736 int ret;
2737 ssize_t nb_events = 0;
2738
2739 switch (domain) {
2740 case LTTNG_DOMAIN_KERNEL:
2741 nb_events = kernel_list_events(kernel_tracer_fd, events);
2742 if (nb_events < 0) {
2743 ret = LTTCOMM_KERN_LIST_FAIL;
2744 goto error;
894be886 2745 }
54d01ffb 2746 break;
b551a063
DG
2747 case LTTNG_DOMAIN_UST:
2748 nb_events = ust_app_list_events(events);
2749 if (nb_events < 0) {
2750 ret = LTTCOMM_UST_LIST_FAIL;
2751 goto error;
2752 }
2753 break;
54d01ffb 2754 default:
54d01ffb
DG
2755 ret = LTTCOMM_NOT_IMPLEMENTED;
2756 goto error;
2757 }
894be886 2758
54d01ffb 2759 return nb_events;
7d29a247 2760
54d01ffb
DG
2761error:
2762 /* Return negative value to differentiate return code */
2763 return -ret;
2764}
b389abbe 2765
54d01ffb
DG
2766/*
2767 * Command LTTNG_START_TRACE processed by the client thread.
2768 */
2769static int cmd_start_trace(struct ltt_session *session)
2770{
2771 int ret;
54d01ffb 2772 struct ltt_kernel_session *ksession;
b9d9b220 2773 struct ltt_ust_session *usess;
b389abbe 2774
54d01ffb
DG
2775 /* Short cut */
2776 ksession = session->kernel_session;
b9d9b220 2777 usess = session->ust_session;
5eb91c98 2778
464dd62d
MD
2779 if (session->enabled)
2780 return LTTCOMM_UST_START_FAIL;
2781 session->enabled = 1;
2782
54d01ffb
DG
2783 /* Kernel tracing */
2784 if (ksession != NULL) {
2bdd86d4
MD
2785 struct ltt_kernel_channel *kchan;
2786
54d01ffb
DG
2787 /* Open kernel metadata */
2788 if (ksession->metadata == NULL) {
2789 ret = kernel_open_metadata(ksession, ksession->trace_path);
2790 if (ret < 0) {
2791 ret = LTTCOMM_KERN_META_FAIL;
2792 goto error;
b389abbe 2793 }
54d01ffb 2794 }
7d29a247 2795
54d01ffb
DG
2796 /* Open kernel metadata stream */
2797 if (ksession->metadata_stream_fd == 0) {
2798 ret = kernel_open_metadata_stream(ksession);
2799 if (ret < 0) {
2800 ERR("Kernel create metadata stream failed");
2801 ret = LTTCOMM_KERN_STREAM_FAIL;
2802 goto error;
2803 }
2804 }
2805
2806 /* For each channel */
2807 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2808 if (kchan->stream_count == 0) {
2809 ret = kernel_open_channel_stream(kchan);
2810 if (ret < 0) {
2811 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2812 goto error;
2813 }
54d01ffb
DG
2814 /* Update the stream global counter */
2815 ksession->stream_count_global += ret;
7d29a247 2816 }
54d01ffb
DG
2817 }
2818
2819 /* Setup kernel consumer socket and send fds to it */
2820 ret = init_kernel_tracing(ksession);
2821 if (ret < 0) {
2822 ret = LTTCOMM_KERN_START_FAIL;
2823 goto error;
2824 }
2825
2826 /* This start the kernel tracing */
2827 ret = kernel_start_session(ksession);
2828 if (ret < 0) {
2829 ret = LTTCOMM_KERN_START_FAIL;
2830 goto error;
2831 }
2832
2833 /* Quiescent wait after starting trace */
2834 kernel_wait_quiescent(kernel_tracer_fd);
2835 }
2836
36dc12cc 2837 /* Flag session that trace should start automatically */
b9d9b220
DG
2838 if (usess) {
2839 usess->start_trace = 1;
36dc12cc 2840
b9d9b220
DG
2841 ret = ust_app_start_trace_all(usess);
2842 if (ret < 0) {
2843 ret = LTTCOMM_UST_START_FAIL;
2844 goto error;
2845 }
2bdd86d4 2846 }
54d01ffb
DG
2847
2848 ret = LTTCOMM_OK;
2849
2850error:
2851 return ret;
2852}
2853
2854/*
2855 * Command LTTNG_STOP_TRACE processed by the client thread.
2856 */
2857static int cmd_stop_trace(struct ltt_session *session)
2858{
2859 int ret;
2860 struct ltt_kernel_channel *kchan;
2861 struct ltt_kernel_session *ksession;
8be98f9a 2862 struct ltt_ust_session *usess;
54d01ffb
DG
2863
2864 /* Short cut */
2865 ksession = session->kernel_session;
8be98f9a 2866 usess = session->ust_session;
54d01ffb 2867
464dd62d
MD
2868 if (!session->enabled)
2869 return LTTCOMM_UST_START_FAIL;
2870 session->enabled = 0;
2871
54d01ffb
DG
2872 /* Kernel tracer */
2873 if (ksession != NULL) {
2874 DBG("Stop kernel tracing");
2875
2876 /* Flush all buffers before stopping */
2877 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2878 if (ret < 0) {
2879 ERR("Kernel metadata flush failed");
2880 }
f34daff7 2881
54d01ffb
DG
2882 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2883 ret = kernel_flush_buffer(kchan);
0d0c377a 2884 if (ret < 0) {
54d01ffb 2885 ERR("Kernel flush buffer error");
7d29a247 2886 }
54d01ffb 2887 }
19e70852 2888
54d01ffb
DG
2889 ret = kernel_stop_session(ksession);
2890 if (ret < 0) {
2891 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2892 goto error;
f3ed775e 2893 }
54d01ffb
DG
2894
2895 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2896 }
54d01ffb 2897
8be98f9a
MD
2898 if (usess) {
2899 usess->start_trace = 0;
2bdd86d4 2900
8be98f9a 2901 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2902 if (ret < 0) {
8be98f9a 2903 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2904 goto error;
2905 }
2bdd86d4 2906 }
54d01ffb
DG
2907
2908 ret = LTTCOMM_OK;
2909
2910error:
2911 return ret;
2912}
2913
2914/*
2915 * Command LTTNG_CREATE_SESSION processed by the client thread.
2916 */
2917static int cmd_create_session(char *name, char *path)
2918{
2919 int ret;
2920
2921 ret = session_create(name, path);
2922 if (ret != LTTCOMM_OK) {
2923 goto error;
2924 }
2925
2926 ret = LTTCOMM_OK;
2927
2928error:
2929 return ret;
2930}
2931
2932/*
2933 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2934 */
2935static int cmd_destroy_session(struct ltt_session *session, char *name)
2936{
2937 int ret;
2938
2939 /* Clean kernel session teardown */
2940 teardown_kernel_session(session);
84cd17c6
MD
2941 /* UST session teardown */
2942 teardown_ust_session(session);
54d01ffb
DG
2943
2944 /*
2945 * Must notify the kernel thread here to update it's poll setin order
2946 * to remove the channel(s)' fd just destroyed.
2947 */
2948 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2949 if (ret < 0) {
2950 perror("write kernel poll pipe");
2951 }
2952
271933a4 2953 ret = session_destroy(session);
54d01ffb
DG
2954
2955 return ret;
2956}
2957
2958/*
2959 * Command LTTNG_CALIBRATE processed by the client thread.
2960 */
2961static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2962{
2963 int ret;
2964
2965 switch (domain) {
2966 case LTTNG_DOMAIN_KERNEL:
33a2b854 2967 {
54d01ffb 2968 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2969
54d01ffb
DG
2970 kcalibrate.type = calibrate->type;
2971 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2972 if (ret < 0) {
54d01ffb
DG
2973 ret = LTTCOMM_KERN_ENABLE_FAIL;
2974 goto error;
33a2b854 2975 }
54d01ffb
DG
2976 break;
2977 }
2978 default:
2979 /* TODO: Userspace tracing */
2980 ret = LTTCOMM_NOT_IMPLEMENTED;
2981 goto error;
2982 }
33a2b854 2983
54d01ffb 2984 ret = LTTCOMM_OK;
33a2b854 2985
54d01ffb
DG
2986error:
2987 return ret;
2988}
7d29a247 2989
54d01ffb
DG
2990/*
2991 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2992 */
2993static int cmd_register_consumer(struct ltt_session *session, int domain,
2994 char *sock_path)
2995{
2996 int ret, sock;
b389abbe 2997
54d01ffb
DG
2998 switch (domain) {
2999 case LTTNG_DOMAIN_KERNEL:
3000 /* Can't register a consumer if there is already one */
3001 if (session->kernel_session->consumer_fd != 0) {
3002 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3003 goto error;
3004 }
3005
3006 sock = lttcomm_connect_unix_sock(sock_path);
3007 if (sock < 0) {
3008 ret = LTTCOMM_CONNECT_FAIL;
3009 goto error;
3010 }
3011
3012 session->kernel_session->consumer_fd = sock;
3013 break;
3014 default:
3015 /* TODO: Userspace tracing */
3016 ret = LTTCOMM_NOT_IMPLEMENTED;
3017 goto error;
3018 }
3019
3020 ret = LTTCOMM_OK;
3021
3022error:
3023 return ret;
3024}
3025
3026/*
3027 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3028 */
3029static ssize_t cmd_list_domains(struct ltt_session *session,
3030 struct lttng_domain **domains)
3031{
b551a063 3032 int ret, index = 0;
54d01ffb
DG
3033 ssize_t nb_dom = 0;
3034
3035 if (session->kernel_session != NULL) {
b551a063 3036 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3037 nb_dom++;
3038 }
3039
b551a063
DG
3040 if (session->ust_session != NULL) {
3041 DBG3("Listing domains found UST global domain");
3042 nb_dom++;
3043 }
54d01ffb 3044
b551a063 3045 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3046 if (*domains == NULL) {
3047 ret = -LTTCOMM_FATAL;
3048 goto error;
3049 }
3050
b551a063
DG
3051 if (session->kernel_session != NULL) {
3052 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3053 index++;
3054 }
3055
3056 if (session->ust_session != NULL) {
3057 (*domains)[index].type = LTTNG_DOMAIN_UST;
3058 index++;
3059 }
54d01ffb 3060
54d01ffb
DG
3061 return nb_dom;
3062
3063error:
3064 return ret;
3065}
3066
3067/*
3068 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3069 */
b551a063 3070static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3071 struct lttng_channel **channels)
3072{
3073 int ret;
3074 ssize_t nb_chan = 0;
3075
b551a063
DG
3076 switch (domain) {
3077 case LTTNG_DOMAIN_KERNEL:
3078 if (session->kernel_session != NULL) {
3079 nb_chan = session->kernel_session->channel_count;
3080 }
0df502fd 3081 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3082 break;
3083 case LTTNG_DOMAIN_UST:
3084 if (session->ust_session != NULL) {
3085 nb_chan = hashtable_get_count(
3086 session->ust_session->domain_global.channels);
3087 }
0df502fd 3088 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3089 break;
3090 default:
3091 *channels = NULL;
3092 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3093 goto error;
3094 }
3095
b551a063
DG
3096 if (nb_chan > 0) {
3097 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3098 if (*channels == NULL) {
3099 ret = -LTTCOMM_FATAL;
3100 goto error;
3101 }
54d01ffb 3102
b551a063
DG
3103 list_lttng_channels(domain, session, *channels);
3104 } else {
3105 *channels = NULL;
3106 }
2bdd86d4 3107
54d01ffb
DG
3108 return nb_chan;
3109
3110error:
3111 return ret;
3112}
3113
3114/*
3115 * Command LTTNG_LIST_EVENTS processed by the client thread.
3116 */
b551a063 3117static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3118 char *channel_name, struct lttng_event **events)
3119{
b551a063 3120 int ret = 0;
54d01ffb 3121 ssize_t nb_event = 0;
54d01ffb 3122
b551a063
DG
3123 switch (domain) {
3124 case LTTNG_DOMAIN_KERNEL:
3125 if (session->kernel_session != NULL) {
3126 nb_event = list_lttng_kernel_events(channel_name,
3127 session->kernel_session, events);
54d01ffb 3128 }
b551a063
DG
3129 break;
3130 case LTTNG_DOMAIN_UST:
3131 {
3132 if (session->ust_session != NULL) {
3133 nb_event = list_lttng_ust_global_events(channel_name,
3134 &session->ust_session->domain_global, events);
3135 }
3136 break;
54d01ffb 3137 }
b551a063
DG
3138 default:
3139 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3140 goto error;
3141 }
3142
b551a063 3143 ret = nb_event;
54d01ffb
DG
3144
3145error:
3146 return ret;
3147}
3148
3149/*
3150 * Process the command requested by the lttng client within the command
3151 * context structure. This function make sure that the return structure (llm)
3152 * is set and ready for transmission before returning.
3153 *
3154 * Return any error encountered or 0 for success.
3155 */
3156static int process_client_msg(struct command_ctx *cmd_ctx)
3157{
3158 int ret = LTTCOMM_OK;
44d3bd01 3159 int need_tracing_session = 1;
54d01ffb
DG
3160
3161 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3162
3163 /*
3164 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3165 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3166 * command.
3167 */
3168 switch(cmd_ctx->lsm->cmd_type) {
3169 case LTTNG_LIST_SESSIONS:
3170 case LTTNG_LIST_TRACEPOINTS:
3171 case LTTNG_LIST_DOMAINS:
3172 case LTTNG_LIST_CHANNELS:
3173 case LTTNG_LIST_EVENTS:
3174 break;
3175 default:
3176 /* Setup lttng message with no payload */
3177 ret = setup_lttng_msg(cmd_ctx, 0);
3178 if (ret < 0) {
3179 /* This label does not try to unlock the session */
3180 goto init_setup_error;
3181 }
3182 }
3183
3184 /* Commands that DO NOT need a session. */
3185 switch (cmd_ctx->lsm->cmd_type) {
3186 case LTTNG_CALIBRATE:
3187 case LTTNG_CREATE_SESSION:
3188 case LTTNG_LIST_SESSIONS:
3189 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3190 need_tracing_session = 0;
54d01ffb
DG
3191 break;
3192 default:
3193 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3194 session_lock_list();
54d01ffb 3195 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3196 session_unlock_list();
54d01ffb
DG
3197 if (cmd_ctx->session == NULL) {
3198 if (cmd_ctx->lsm->session.name != NULL) {
3199 ret = LTTCOMM_SESS_NOT_FOUND;
3200 } else {
3201 /* If no session name specified */
3202 ret = LTTCOMM_SELECT_SESS;
3203 }
3204 goto error;
3205 } else {
3206 /* Acquire lock for the session */
3207 session_lock(cmd_ctx->session);
3208 }
3209 break;
3210 }
b389abbe 3211
54d01ffb
DG
3212 /*
3213 * Check domain type for specific "pre-action".
3214 */
3215 switch (cmd_ctx->lsm->domain.type) {
3216 case LTTNG_DOMAIN_KERNEL:
3217 /* Kernel tracer check */
3218 if (kernel_tracer_fd == 0) {
3219 /* Basically, load kernel tracer modules */
3220 init_kernel_tracer();
3221 if (kernel_tracer_fd == 0) {
3222 ret = LTTCOMM_KERN_NA;
3223 goto error;
3224 }
3225 }
5eb91c98 3226
54d01ffb 3227 /* Need a session for kernel command */
44d3bd01 3228 if (need_tracing_session) {
54d01ffb
DG
3229 if (cmd_ctx->session->kernel_session == NULL) {
3230 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3231 if (ret < 0) {
54d01ffb 3232 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3233 goto error;
3234 }
b389abbe 3235 }
7d29a247 3236
54d01ffb 3237 /* Start the kernel consumer daemon */
3bd1e081
MD
3238 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3239 if (kconsumer_data.pid == 0 &&
54d01ffb 3240 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3241 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3242 ret = start_consumerd(&kconsumer_data);
7d29a247 3243 if (ret < 0) {
54d01ffb
DG
3244 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3245 goto error;
950131af 3246 }
3ff2ecac
MD
3247 } else {
3248 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3249 }
0d0c377a 3250 }
54d01ffb 3251 break;
2bdd86d4 3252 case LTTNG_DOMAIN_UST:
44d3bd01 3253 {
44d3bd01 3254 if (need_tracing_session) {
f6a9efaa 3255 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3256 ret = create_ust_session(cmd_ctx->session,
3257 &cmd_ctx->lsm->domain);
3258 if (ret != LTTCOMM_OK) {
3259 goto error;
3260 }
3261 }
7753dea8
MD
3262 /* Start the UST consumer daemons */
3263 /* 64-bit */
3264 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
ebaeda94 3265 if (consumerd64_path[0] != '\0' &&
7753dea8 3266 ustconsumer64_data.pid == 0 &&
2bdd86d4 3267 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3268 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3269 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3270 if (ret < 0) {
7753dea8
MD
3271 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3272 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3273 goto error;
3274 }
48842b30 3275
7753dea8 3276 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3277 } else {
7753dea8
MD
3278 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3279 }
3280 /* 32-bit */
ebaeda94 3281 if (consumerd32_path[0] != '\0' &&
7753dea8
MD
3282 ustconsumer32_data.pid == 0 &&
3283 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3284 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3285 ret = start_consumerd(&ustconsumer32_data);
3286 if (ret < 0) {
3287 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3288 ust_consumerd32_fd = -EINVAL;
3289 goto error;
3290 }
3291 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3292 } else {
3293 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3294 }
44d3bd01
DG
3295 }
3296 break;
48842b30 3297 }
54d01ffb 3298 default:
54d01ffb
DG
3299 break;
3300 }
33a2b854 3301
54d01ffb
DG
3302 /* Process by command type */
3303 switch (cmd_ctx->lsm->cmd_type) {
3304 case LTTNG_ADD_CONTEXT:
3305 {
3306 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3307 cmd_ctx->lsm->u.context.channel_name,
3308 cmd_ctx->lsm->u.context.event_name,
3309 &cmd_ctx->lsm->u.context.ctx);
3310 break;
3311 }
3312 case LTTNG_DISABLE_CHANNEL:
3313 {
3314 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3315 cmd_ctx->lsm->u.disable.channel_name);
3316 break;
3317 }
3318 case LTTNG_DISABLE_EVENT:
3319 {
3320 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3321 cmd_ctx->lsm->u.disable.channel_name,
3322 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3323 ret = LTTCOMM_OK;
3324 break;
3325 }
54d01ffb
DG
3326 case LTTNG_DISABLE_ALL_EVENT:
3327 {
2bdd86d4 3328 DBG("Disabling all events");
54d01ffb
DG
3329
3330 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3331 cmd_ctx->lsm->u.disable.channel_name);
3332 break;
3333 }
3334 case LTTNG_ENABLE_CHANNEL:
3335 {
aea829b3 3336 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG
3337 &cmd_ctx->lsm->u.channel.chan);
3338 break;
3339 }
3340 case LTTNG_ENABLE_EVENT:
3341 {
3342 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3343 cmd_ctx->lsm->u.enable.channel_name,
3344 &cmd_ctx->lsm->u.enable.event);
3345 break;
3346 }
3347 case LTTNG_ENABLE_ALL_EVENT:
3348 {
2bdd86d4 3349 DBG("Enabling all events");
54d01ffb
DG
3350
3351 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3352 cmd_ctx->lsm->u.enable.channel_name,
3353 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3354 break;
3355 }
052da939 3356 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3357 {
9f19cc17 3358 struct lttng_event *events;
54d01ffb 3359 ssize_t nb_events;
052da939 3360