Fix: main.c client/apps sockets and kernel_trace_fd close(0)
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
ca4537d3 20#include <fcntl.h>
fac6795d
DG
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
990570ed 41#include <common/common.h>
0ba98ebc 42#include <common/compat/poll.h>
db758600
DG
43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD
58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG
117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
a4b35e07
MD
125static int client_sock = -1;
126static int apps_sock = -1;
127static int kernel_tracer_fd = -1;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG
130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG
136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG
150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG
159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD
171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fb6f1fa2
YB
174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD
178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD
207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD
225 }
226}
227
5eb91c98
DG
228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG
272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD
275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
ca4537d3 298 int ret;
273ea72c 299
ca4537d3 300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
273ea72c 301 if (ret < 0) {
ca4537d3 302 perror("thread quit pipe");
273ea72c
DG
303 goto error;
304 }
305
306error:
307 return ret;
308}
309
fac6795d 310/*
d063d709
DG
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
fac6795d 313 */
1d4b027a 314static void teardown_kernel_session(struct ltt_session *session)
fac6795d 315{
8f7a84dd 316 if (!session->kernel_session) {
99bab54f 317 DBG3("No kernel session when tearing down session");
84ea9c99 318 return;
8f7a84dd
DG
319 }
320
84ea9c99 321 DBG("Tearing down kernel session");
d9800920 322
84ea9c99
MD
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 329 }
84ea9c99
MD
330
331 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
332}
333
f6a9efaa
DG
334/*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338static void teardown_ust_session(struct ltt_session *session)
339{
84cd17c6
MD
340 int ret;
341
8f7a84dd 342 if (!session->ust_session) {
99bab54f 343 DBG3("No UST session when tearing down session");
f470a390 344 return;
8f7a84dd
DG
345 }
346
84ea9c99 347 DBG("Tearing down UST session(s)");
8f7a84dd 348
84cd17c6
MD
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
8f7a84dd 353
f6a9efaa
DG
354 trace_ust_destroy_session(session->ust_session);
355}
356
099e26bd
DG
357/*
358 * Stop all threads by closing the thread quit pipe.
359 */
cf3af59e
MD
360static void stop_threads(void)
361{
5eb91c98
DG
362 int ret;
363
cf3af59e
MD
364 /* Stopping all threads */
365 DBG("Terminating all threads");
54d01ffb 366 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
099e26bd
DG
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
374}
375
fac6795d 376/*
d063d709 377 * Cleanup the daemon
fac6795d 378 */
cf3af59e 379static void cleanup(void)
fac6795d 380{
1d4b027a
DG
381 int ret;
382 char *cmd;
af9737e9 383 struct ltt_session *sess, *stmp;
fac6795d 384
1d4b027a 385 DBG("Cleaning up");
e07ae692 386
67e40797
DG
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
5461b305 392
67e40797
DG
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
1d4b027a 397 }
67e40797 398 free(cmd);
5461b305 399
99bab54f 400 DBG("Cleaning up all sessions");
fac6795d 401
b5541356 402 /* Destroy session list mutex */
273ea72c
DG
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
54d01ffb
DG
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
273ea72c 409 teardown_kernel_session(sess);
f6a9efaa
DG
410 teardown_ust_session(sess);
411 free(sess);
273ea72c
DG
412 }
413 }
414
099e26bd 415 DBG("Closing all UST sockets");
56fff090 416 ust_app_clean_list();
099e26bd 417
3bd1e081 418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 419
4fba7219
DG
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
a4b35e07
MD
422 if (kernel_tracer_fd >= 0) {
423 close(kernel_tracer_fd);
424 }
2f50c8a3 425 DBG("Unloading kernel modules");
096102bd 426 modprobe_remove_lttng_all();
2f50c8a3 427 }
5eb91c98
DG
428
429 close(thread_quit_pipe[0]);
430 close(thread_quit_pipe[1]);
421cb601
DG
431
432 /* <fun> */
f56a39af 433 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
434 "Matthew, BEET driven development works!%c[%dm",
435 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
436 /* </fun> */
fac6795d
DG
437}
438
e065084a 439/*
d063d709 440 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 441 *
d063d709 442 * Return lttcomm error code.
e065084a
DG
443 */
444static int send_unix_sock(int sock, void *buf, size_t len)
445{
446 /* Check valid length */
447 if (len <= 0) {
448 return -1;
449 }
450
451 return lttcomm_send_unix_sock(sock, buf, len);
452}
453
5461b305 454/*
d063d709 455 * Free memory of a command context structure.
5461b305 456 */
a2fb29a5 457static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 458{
a2fb29a5
DG
459 DBG("Clean command context structure");
460 if (*cmd_ctx) {
461 if ((*cmd_ctx)->llm) {
462 free((*cmd_ctx)->llm);
5461b305 463 }
a2fb29a5
DG
464 if ((*cmd_ctx)->lsm) {
465 free((*cmd_ctx)->lsm);
5461b305 466 }
a2fb29a5
DG
467 free(*cmd_ctx);
468 *cmd_ctx = NULL;
5461b305
DG
469 }
470}
471
f3ed775e 472/*
d063d709 473 * Send all stream fds of kernel channel to the consumer.
f3ed775e 474 */
2bdd86d4 475static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
476 int sock, struct ltt_kernel_channel *channel,
477 uid_t uid, gid_t gid)
f3ed775e
DG
478{
479 int ret;
f3ed775e 480 struct ltt_kernel_stream *stream;
3bd1e081 481 struct lttcomm_consumer_msg lkm;
f3ed775e 482
3bd1e081 483 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 484 channel->channel->name);
f3ed775e 485
3bd1e081
MD
486 /* Send channel */
487 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
488 lkm.u.channel.channel_key = channel->fd;
489 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
490 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 491 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 492 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 493 if (ret < 0) {
3bd1e081 494 perror("send consumer channel");
f3ed775e
DG
495 goto error;
496 }
497
3bd1e081 498 /* Send streams */
7a485870 499 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
500 if (!stream->fd) {
501 continue;
502 }
503 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
504 lkm.u.stream.channel_key = channel->fd;
505 lkm.u.stream.stream_key = stream->fd;
506 lkm.u.stream.state = stream->state;
507 lkm.u.stream.output = channel->channel->attr.output;
508 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
509 lkm.u.stream.uid = uid;
510 lkm.u.stream.gid = gid;
3bd1e081
MD
511 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
512 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
513 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
514 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
515 if (ret < 0) {
516 perror("send consumer stream");
517 goto error;
518 }
519 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
520 if (ret < 0) {
521 perror("send consumer stream ancillary data");
522 goto error;
f3ed775e
DG
523 }
524 }
525
3bd1e081 526 DBG("consumer channel streams sent");
f3ed775e
DG
527
528 return 0;
529
530error:
531 return ret;
532}
533
534/*
d063d709 535 * Send all stream fds of the kernel session to the consumer.
f3ed775e 536 */
2bdd86d4 537static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 538 struct ltt_kernel_session *session)
f3ed775e
DG
539{
540 int ret;
541 struct ltt_kernel_channel *chan;
3bd1e081
MD
542 struct lttcomm_consumer_msg lkm;
543 int sock = session->consumer_fd;
7a485870
DG
544
545 DBG("Sending metadata stream fd");
546
2bdd86d4 547 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 548 if (session->consumer_fd == 0) {
3bd1e081 549 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
550 }
551
7a485870 552 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
553 /* Send metadata channel fd */
554 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
555 lkm.u.channel.channel_key = session->metadata->fd;
556 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
557 lkm.u.channel.mmap_len = 0; /* for kernel */
558 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
559 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
560 if (ret < 0) {
561 perror("send consumer channel");
562 goto error;
563 }
564
565 /* Send metadata stream fd */
566 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
567 lkm.u.stream.channel_key = session->metadata->fd;
568 lkm.u.stream.stream_key = session->metadata_stream_fd;
569 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
570 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
571 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
572 lkm.u.stream.uid = session->uid;
573 lkm.u.stream.gid = session->gid;
3bd1e081
MD
574 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
575 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
576 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
577 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
578 if (ret < 0) {
579 perror("send consumer stream");
580 goto error;
581 }
582 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 583 if (ret < 0) {
3bd1e081 584 perror("send consumer stream");
7a485870
DG
585 goto error;
586 }
587 }
f3ed775e 588
f3ed775e 589 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
590 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
591 session->uid, session->gid);
2bdd86d4
MD
592 if (ret < 0) {
593 goto error;
594 }
595 }
596
597 DBG("consumer fds (metadata and channel streams) sent");
598
599 return 0;
600
601error:
602 return ret;
603}
604
fac6795d 605/*
0fdd1e2c 606 * Notify UST applications using the shm mmap futex.
fac6795d 607 */
0fdd1e2c 608static int notify_ust_apps(int active)
fac6795d 609{
0fdd1e2c 610 char *wait_shm_mmap;
fac6795d 611
0fdd1e2c 612 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 613
0fdd1e2c
DG
614 /* See shm.c for this call implying mmap, shm and futex calls */
615 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
616 if (wait_shm_mmap == NULL) {
fac6795d
DG
617 goto error;
618 }
619
0fdd1e2c
DG
620 /* Wake waiting process */
621 futex_wait_update((int32_t *) wait_shm_mmap, active);
622
623 /* Apps notified successfully */
624 return 0;
fac6795d
DG
625
626error:
0fdd1e2c 627 return -1;
fac6795d
DG
628}
629
e065084a 630/*
d063d709
DG
631 * Setup the outgoing data buffer for the response (llm) by allocating the
632 * right amount of memory and copying the original information from the lsm
633 * structure.
ca95a216 634 *
d063d709 635 * Return total size of the buffer pointed by buf.
ca95a216 636 */
5461b305 637static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 638{
f3ed775e 639 int ret, buf_size;
ca95a216 640
f3ed775e 641 buf_size = size;
5461b305 642
ba7f0ae5 643 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 644 if (cmd_ctx->llm == NULL) {
ba7f0ae5 645 perror("zmalloc");
5461b305 646 ret = -ENOMEM;
ca95a216
DG
647 goto error;
648 }
649
5461b305
DG
650 /* Copy common data */
651 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 652 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 653
5461b305
DG
654 cmd_ctx->llm->data_size = size;
655 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
656
ca95a216
DG
657 return buf_size;
658
659error:
660 return ret;
661}
662
7a485870 663/*
5eb91c98 664 * Update the kernel poll set of all channel fd available over all tracing
d063d709 665 * session. Add the wakeup pipe at the end of the set.
7a485870 666 */
5eb91c98 667static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 668{
5eb91c98 669 int ret;
7a485870
DG
670 struct ltt_session *session;
671 struct ltt_kernel_channel *channel;
672
5eb91c98 673 DBG("Updating kernel poll set");
7a485870 674
54d01ffb 675 session_lock_list();
b5541356 676 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 677 session_lock(session);
7a485870 678 if (session->kernel_session == NULL) {
54d01ffb 679 session_unlock(session);
7a485870
DG
680 continue;
681 }
7a485870 682
54d01ffb
DG
683 cds_list_for_each_entry(channel,
684 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
685 /* Add channel fd to the kernel poll set */
686 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
687 if (ret < 0) {
54d01ffb 688 session_unlock(session);
5eb91c98
DG
689 goto error;
690 }
691 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 692 }
54d01ffb 693 session_unlock(session);
7a485870 694 }
54d01ffb 695 session_unlock_list();
7a485870 696
5eb91c98 697 return 0;
7a485870
DG
698
699error:
54d01ffb 700 session_unlock_list();
7a485870
DG
701 return -1;
702}
703
704/*
54d01ffb 705 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 706 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 707 *
d063d709 708 * Useful for CPU hotplug feature.
7a485870 709 */
2bdd86d4 710static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
711{
712 int ret = 0;
713 struct ltt_session *session;
714 struct ltt_kernel_channel *channel;
715
716 DBG("Updating kernel streams for channel fd %d", fd);
717
54d01ffb 718 session_lock_list();
b5541356 719 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 720 session_lock(session);
7a485870 721 if (session->kernel_session == NULL) {
54d01ffb 722 session_unlock(session);
7a485870
DG
723 continue;
724 }
d9800920
DG
725
726 /* This is not suppose to be 0 but this is an extra security check */
727 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 728 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
729 }
730
5eb91c98
DG
731 cds_list_for_each_entry(channel,
732 &session->kernel_session->channel_list.head, list) {
7a485870
DG
733 if (channel->fd == fd) {
734 DBG("Channel found, updating kernel streams");
735 ret = kernel_open_channel_stream(channel);
736 if (ret < 0) {
b3c750d2 737 goto error;
7a485870 738 }
d9800920 739
7a485870 740 /*
5eb91c98
DG
741 * Have we already sent fds to the consumer? If yes, it means
742 * that tracing is started so it is safe to send our updated
743 * stream fds.
7a485870 744 */
3bd1e081 745 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 746 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
747 session->kernel_session->consumer_fd, channel,
748 session->uid, session->gid);
7a485870 749 if (ret < 0) {
b3c750d2 750 goto error;
7a485870
DG
751 }
752 }
b3c750d2 753 goto error;
7a485870
DG
754 }
755 }
54d01ffb 756 session_unlock(session);
7a485870 757 }
54d01ffb 758 session_unlock_list();
b3c750d2 759 return ret;
7a485870 760
b3c750d2 761error:
54d01ffb
DG
762 session_unlock(session);
763 session_unlock_list();
7a485870
DG
764 return ret;
765}
766
487cf67c
DG
767/*
768 * For each tracing session, update newly registered apps.
769 */
770static void update_ust_app(int app_sock)
771{
772 struct ltt_session *sess, *stmp;
773
4ee14516
DG
774 session_lock_list();
775
487cf67c
DG
776 /* For all tracing session(s) */
777 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 778 session_lock(sess);
421cb601
DG
779 if (sess->ust_session) {
780 ust_app_global_update(sess->ust_session, app_sock);
781 }
4ee14516 782 session_unlock(sess);
487cf67c 783 }
4ee14516
DG
784
785 session_unlock_list();
487cf67c
DG
786}
787
7a485870 788/*
d063d709 789 * This thread manage event coming from the kernel.
7a485870 790 *
d063d709
DG
791 * Features supported in this thread:
792 * -) CPU Hotplug
7a485870
DG
793 */
794static void *thread_manage_kernel(void *data)
795{
5eb91c98
DG
796 int ret, i, pollfd, update_poll_flag = 1;
797 uint32_t revents, nb_fd;
7a485870 798 char tmp;
5eb91c98 799 struct lttng_poll_event events;
7a485870
DG
800
801 DBG("Thread manage kernel started");
802
5eb91c98
DG
803 ret = create_thread_poll_set(&events, 2);
804 if (ret < 0) {
805 goto error;
806 }
807
808 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
809 if (ret < 0) {
810 goto error;
811 }
812
7a485870
DG
813 while (1) {
814 if (update_poll_flag == 1) {
5f822d0a
DG
815 /*
816 * Reset number of fd in the poll set. Always 2 since there is the thread
817 * quit pipe and the kernel pipe.
818 */
819 events.nb_fd = 2;
820
5eb91c98
DG
821 ret = update_kernel_poll(&events);
822 if (ret < 0) {
7a485870
DG
823 goto error;
824 }
825 update_poll_flag = 0;
826 }
827
5eb91c98
DG
828 nb_fd = LTTNG_POLL_GETNB(&events);
829
830 DBG("Thread kernel polling on %d fds", nb_fd);
831
832 /* Zeroed the poll events */
833 lttng_poll_reset(&events);
7a485870
DG
834
835 /* Poll infinite value of time */
a8b0b341 836 restart:
5eb91c98 837 ret = lttng_poll_wait(&events, -1);
7a485870 838 if (ret < 0) {
a8b0b341
MD
839 /*
840 * Restart interrupted system call.
841 */
842 if (errno == EINTR) {
843 goto restart;
844 }
7a485870
DG
845 goto error;
846 } else if (ret == 0) {
847 /* Should not happen since timeout is infinite */
85611738
DG
848 ERR("Return value of poll is 0 with an infinite timeout.\n"
849 "This should not have happened! Continuing...");
7a485870
DG
850 continue;
851 }
852
5eb91c98
DG
853 for (i = 0; i < nb_fd; i++) {
854 /* Fetch once the poll data */
855 revents = LTTNG_POLL_GETEV(&events, i);
856 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 857
5eb91c98
DG
858 /* Thread quit pipe has been closed. Killing thread. */
859 ret = check_thread_quit_pipe(pollfd, revents);
860 if (ret) {
861 goto error;
862 }
7a485870 863
5eb91c98
DG
864 /* Check for data on kernel pipe */
865 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
866 ret = read(kernel_poll_pipe[0], &tmp, 1);
867 update_poll_flag = 1;
868 continue;
869 } else {
870 /*
871 * New CPU detected by the kernel. Adding kernel stream to
872 * kernel session and updating the kernel consumer
873 */
874 if (revents & LPOLLIN) {
2bdd86d4 875 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
876 if (ret < 0) {
877 continue;
878 }
879 break;
880 /*
881 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
882 * and unregister kernel stream at this point.
883 */
7a485870 884 }
7a485870
DG
885 }
886 }
887 }
888
889error:
890 DBG("Kernel thread dying");
273ea72c
DG
891 close(kernel_poll_pipe[0]);
892 close(kernel_poll_pipe[1]);
5eb91c98
DG
893
894 lttng_poll_clean(&events);
895
7a485870
DG
896 return NULL;
897}
898
1d4b027a 899/*
3bd1e081 900 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 901 */
3bd1e081 902static void *thread_manage_consumer(void *data)
1d4b027a 903{
5eb91c98
DG
904 int sock = 0, i, ret, pollfd;
905 uint32_t revents, nb_fd;
1d4b027a 906 enum lttcomm_return_code code;
5eb91c98 907 struct lttng_poll_event events;
3bd1e081 908 struct consumer_data *consumer_data = data;
1d4b027a 909
3bd1e081 910 DBG("[thread] Manage consumer started");
1d4b027a 911
3bd1e081 912 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
913 if (ret < 0) {
914 goto error;
915 }
916
5eb91c98
DG
917 /*
918 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
919 * Nothing more will be added to this poll set.
920 */
921 ret = create_thread_poll_set(&events, 2);
922 if (ret < 0) {
923 goto error;
924 }
273ea72c 925
3bd1e081 926 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
927 if (ret < 0) {
928 goto error;
929 }
930
931 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
932
933 /* Inifinite blocking call, waiting for transmission */
a8b0b341 934restart:
5eb91c98 935 ret = lttng_poll_wait(&events, -1);
273ea72c 936 if (ret < 0) {
a8b0b341
MD
937 /*
938 * Restart interrupted system call.
939 */
940 if (errno == EINTR) {
941 goto restart;
942 }
273ea72c
DG
943 goto error;
944 }
945
5eb91c98
DG
946 for (i = 0; i < nb_fd; i++) {
947 /* Fetch once the poll data */
948 revents = LTTNG_POLL_GETEV(&events, i);
949 pollfd = LTTNG_POLL_GETFD(&events, i);
950
951 /* Thread quit pipe has been closed. Killing thread. */
952 ret = check_thread_quit_pipe(pollfd, revents);
953 if (ret) {
954 goto error;
955 }
956
957 /* Event on the registration socket */
3bd1e081 958 if (pollfd == consumer_data->err_sock) {
5eb91c98 959 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 960 ERR("consumer err socket poll error");
5eb91c98
DG
961 goto error;
962 }
963 }
273ea72c
DG
964 }
965
3bd1e081 966 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
967 if (sock < 0) {
968 goto error;
969 }
970
3bd1e081 971 DBG2("Receiving code from consumer err_sock");
ee0b0061 972
712ea556 973 /* Getting status code from kconsumerd */
54d01ffb
DG
974 ret = lttcomm_recv_unix_sock(sock, &code,
975 sizeof(enum lttcomm_return_code));
1d4b027a
DG
976 if (ret <= 0) {
977 goto error;
978 }
979
3bd1e081
MD
980 if (code == CONSUMERD_COMMAND_SOCK_READY) {
981 consumer_data->cmd_sock =
982 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
983 if (consumer_data->cmd_sock < 0) {
984 sem_post(&consumer_data->sem);
48842b30 985 PERROR("consumer connect");
1d4b027a
DG
986 goto error;
987 }
988 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
989 sem_post(&consumer_data->sem);
990 DBG("consumer command socket ready");
1d4b027a 991 } else {
3bd1e081 992 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
993 lttcomm_get_readable_code(-code));
994 goto error;
995 }
996
54d01ffb 997 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 998 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 999 if (ret < 0) {
72079cae
DG
1000 goto error;
1001 }
1002
5eb91c98
DG
1003 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1004 if (ret < 0) {
72079cae 1005 goto error;
5eb91c98
DG
1006 }
1007
1008 /* Update number of fd */
1009 nb_fd = LTTNG_POLL_GETNB(&events);
1010
1011 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1012restart_poll:
5eb91c98
DG
1013 ret = lttng_poll_wait(&events, -1);
1014 if (ret < 0) {
a8b0b341
MD
1015 /*
1016 * Restart interrupted system call.
1017 */
1018 if (errno == EINTR) {
1019 goto restart_poll;
1020 }
72079cae
DG
1021 goto error;
1022 }
1023
5eb91c98
DG
1024 for (i = 0; i < nb_fd; i++) {
1025 /* Fetch once the poll data */
1026 revents = LTTNG_POLL_GETEV(&events, i);
1027 pollfd = LTTNG_POLL_GETFD(&events, i);
1028
1029 /* Thread quit pipe has been closed. Killing thread. */
1030 ret = check_thread_quit_pipe(pollfd, revents);
1031 if (ret) {
1032 goto error;
1033 }
1034
1035 /* Event on the kconsumerd socket */
1036 if (pollfd == sock) {
1037 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1038 ERR("consumer err socket second poll error");
5eb91c98
DG
1039 goto error;
1040 }
1041 }
1042 }
1043
712ea556 1044 /* Wait for any kconsumerd error */
54d01ffb
DG
1045 ret = lttcomm_recv_unix_sock(sock, &code,
1046 sizeof(enum lttcomm_return_code));
712ea556 1047 if (ret <= 0) {
3bd1e081 1048 ERR("consumer closed the command socket");
712ea556 1049 goto error;
6f61d021 1050 }
1d4b027a 1051
3bd1e081 1052 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1053
1d4b027a 1054error:
3bd1e081
MD
1055 DBG("consumer thread dying");
1056 close(consumer_data->err_sock);
1057 close(consumer_data->cmd_sock);
5eb91c98 1058 close(sock);
273ea72c 1059
3bd1e081
MD
1060 unlink(consumer_data->err_unix_sock_path);
1061 unlink(consumer_data->cmd_unix_sock_path);
1062 consumer_data->pid = 0;
1d4b027a 1063
5eb91c98 1064 lttng_poll_clean(&events);
0177d773 1065
5eb91c98 1066 return NULL;
099e26bd
DG
1067}
1068
099e26bd
DG
1069/*
1070 * This thread manage application communication.
1d4b027a
DG
1071 */
1072static void *thread_manage_apps(void *data)
099e26bd 1073{
5eb91c98
DG
1074 int i, ret, pollfd;
1075 uint32_t revents, nb_fd;
099e26bd 1076 struct ust_command ust_cmd;
5eb91c98 1077 struct lttng_poll_event events;
099e26bd
DG
1078
1079 DBG("[thread] Manage application started");
1080
f6a9efaa
DG
1081 rcu_register_thread();
1082 rcu_thread_online();
1083
5eb91c98
DG
1084 ret = create_thread_poll_set(&events, 2);
1085 if (ret < 0) {
1086 goto error;
1087 }
099e26bd 1088
5eb91c98
DG
1089 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG
1094 while (1) {
1095 /* Zeroed the events structure */
1096 lttng_poll_reset(&events);
0177d773 1097
5eb91c98 1098 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1099
1100 DBG("Apps thread polling on %d fds", nb_fd);
1101
1102 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1103 restart:
5eb91c98 1104 ret = lttng_poll_wait(&events, -1);
099e26bd 1105 if (ret < 0) {
a8b0b341
MD
1106 /*
1107 * Restart interrupted system call.
1108 */
1109 if (errno == EINTR) {
1110 goto restart;
1111 }
099e26bd
DG
1112 goto error;
1113 }
1114
5eb91c98
DG
1115 for (i = 0; i < nb_fd; i++) {
1116 /* Fetch once the poll data */
1117 revents = LTTNG_POLL_GETEV(&events, i);
1118 pollfd = LTTNG_POLL_GETFD(&events, i);
1119
1120 /* Thread quit pipe has been closed. Killing thread. */
1121 ret = check_thread_quit_pipe(pollfd, revents);
1122 if (ret) {
099e26bd 1123 goto error;
5eb91c98 1124 }
099e26bd 1125
5eb91c98
DG
1126 /* Inspect the apps cmd pipe */
1127 if (pollfd == apps_cmd_pipe[0]) {
1128 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1129 ERR("Apps command pipe error");
0177d773 1130 goto error;
5eb91c98
DG
1131 } else if (revents & LPOLLIN) {
1132 /* Empty pipe */
1133 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1134 if (ret < 0 || ret < sizeof(ust_cmd)) {
1135 perror("read apps cmd pipe");
1136 goto error;
1137 }
099e26bd 1138
5eb91c98 1139 /* Register applicaton to the session daemon */
56fff090 1140 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1141 ust_cmd.sock);
88ff5b7f 1142 if (ret == -ENOMEM) {
5eb91c98 1143 goto error;
88ff5b7f
MD
1144 } else if (ret < 0) {
1145 break;
5eb91c98
DG
1146 }
1147
acc7b41b 1148 /*
e0c7ec2b 1149 * Validate UST version compatibility.
acc7b41b 1150 */
e0c7ec2b
DG
1151 ret = ust_app_validate_version(ust_cmd.sock);
1152 if (ret >= 0) {
1153 /*
1154 * Add channel(s) and event(s) to newly registered apps
1155 * from lttng global UST domain.
1156 */
1157 update_ust_app(ust_cmd.sock);
1158 }
acc7b41b 1159
f2ca2e25 1160 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1161 if (ret < 0) {
1162 /*
1163 * If the registration is not possible, we simply
1164 * unregister the apps and continue
1165 */
56fff090 1166 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1167 } else {
1168 /*
1169 * We just need here to monitor the close of the UST
1170 * socket and poll set monitor those by default.
ab08a675
MD
1171 * Listen on POLLIN (even if we never expect any
1172 * data) to ensure that hangup wakes us.
5eb91c98 1173 */
ab08a675 1174 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1175 if (ret < 0) {
1176 goto error;
1177 }
1178
54d01ffb
DG
1179 DBG("Apps with sock %d added to poll set",
1180 ust_cmd.sock);
5eb91c98 1181 }
487cf67c 1182
5eb91c98 1183 break;
0177d773 1184 }
5eb91c98
DG
1185 } else {
1186 /*
54d01ffb
DG
1187 * At this point, we know that a registered application made
1188 * the event at poll_wait.
5eb91c98
DG
1189 */
1190 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1191 /* Removing from the poll set */
1192 ret = lttng_poll_del(&events, pollfd);
1193 if (ret < 0) {
1194 goto error;
1195 }
099e26bd 1196
b9d9b220 1197 /* Socket closed on remote end. */
56fff090 1198 ust_app_unregister(pollfd);
5eb91c98
DG
1199 break;
1200 }
099e26bd
DG
1201 }
1202 }
099e26bd
DG
1203 }
1204
1205error:
1206 DBG("Application communication apps dying");
1207 close(apps_cmd_pipe[0]);
1208 close(apps_cmd_pipe[1]);
1209
5eb91c98 1210 lttng_poll_clean(&events);
099e26bd 1211
f6a9efaa
DG
1212 rcu_thread_offline();
1213 rcu_unregister_thread();
099e26bd
DG
1214 return NULL;
1215}
1216
1217/*
1218 * Dispatch request from the registration threads to the application
1219 * communication thread.
1220 */
1221static void *thread_dispatch_ust_registration(void *data)
1222{
1223 int ret;
1224 struct cds_wfq_node *node;
1225 struct ust_command *ust_cmd = NULL;
1226
1227 DBG("[thread] Dispatch UST command started");
1228
1229 while (!dispatch_thread_exit) {
1230 /* Atomically prepare the queue futex */
1231 futex_nto1_prepare(&ust_cmd_queue.futex);
1232
1233 do {
1234 /* Dequeue command for registration */
1235 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1236 if (node == NULL) {
00a17c97 1237 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1238 /* Continue thread execution */
1239 break;
1240 }
1241
1242 ust_cmd = caa_container_of(node, struct ust_command, node);
1243
2f50c8a3
DG
1244 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1245 " gid:%d sock:%d name:%s (version %d.%d)",
1246 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1247 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1248 ust_cmd->sock, ust_cmd->reg_msg.name,
1249 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1250 /*
1251 * Inform apps thread of the new application registration. This
1252 * call is blocking so we can be assured that the data will be read
1253 * at some point in time or wait to the end of the world :)
1254 */
1255 ret = write(apps_cmd_pipe[1], ust_cmd,
1256 sizeof(struct ust_command));
1257 if (ret < 0) {
1258 perror("write apps cmd pipe");
1259 if (errno == EBADF) {
1260 /*
1261 * We can't inform the application thread to process
1262 * registration. We will exit or else application
1263 * registration will not occur and tracing will never
1264 * start.
1265 */
1266 goto error;
1267 }
1268 }
1269 free(ust_cmd);
1270 } while (node != NULL);
1271
1272 /* Futex wait on queue. Blocking call on futex() */
1273 futex_nto1_wait(&ust_cmd_queue.futex);
1274 }
1275
1276error:
1277 DBG("Dispatch thread dying");
1278 return NULL;
1279}
1280
1281/*
1282 * This thread manage application registration.
1283 */
1284static void *thread_registration_apps(void *data)
1d4b027a 1285{
a4b35e07 1286 int sock = -1, i, ret, pollfd;
5eb91c98
DG
1287 uint32_t revents, nb_fd;
1288 struct lttng_poll_event events;
099e26bd
DG
1289 /*
1290 * Get allocated in this thread, enqueued to a global queue, dequeued and
1291 * freed in the manage apps thread.
1292 */
1293 struct ust_command *ust_cmd = NULL;
1d4b027a 1294
099e26bd 1295 DBG("[thread] Manage application registration started");
1d4b027a
DG
1296
1297 ret = lttcomm_listen_unix_sock(apps_sock);
1298 if (ret < 0) {
1299 goto error;
1300 }
1301
5eb91c98
DG
1302 /*
1303 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1304 * more will be added to this poll set.
1305 */
1306 ret = create_thread_poll_set(&events, 2);
1307 if (ret < 0) {
1308 goto error;
1309 }
273ea72c 1310
5eb91c98
DG
1311 /* Add the application registration socket */
1312 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1313 if (ret < 0) {
1314 goto error;
1315 }
273ea72c 1316
1d4b027a 1317 /* Notify all applications to register */
0fdd1e2c
DG
1318 ret = notify_ust_apps(1);
1319 if (ret < 0) {
1320 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1321 "Execution continues but there might be problem for already\n"
1322 "running applications that wishes to register.");
0fdd1e2c 1323 }
1d4b027a
DG
1324
1325 while (1) {
1326 DBG("Accepting application registration");
273ea72c 1327
5eb91c98
DG
1328 nb_fd = LTTNG_POLL_GETNB(&events);
1329
273ea72c 1330 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1331 restart:
5eb91c98 1332 ret = lttng_poll_wait(&events, -1);
273ea72c 1333 if (ret < 0) {
a8b0b341
MD
1334 /*
1335 * Restart interrupted system call.
1336 */
1337 if (errno == EINTR) {
1338 goto restart;
1339 }
273ea72c
DG
1340 goto error;
1341 }
1342
5eb91c98
DG
1343 for (i = 0; i < nb_fd; i++) {
1344 /* Fetch once the poll data */
1345 revents = LTTNG_POLL_GETEV(&events, i);
1346 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1347
5eb91c98
DG
1348 /* Thread quit pipe has been closed. Killing thread. */
1349 ret = check_thread_quit_pipe(pollfd, revents);
1350 if (ret) {
90014c57
DG
1351 goto error;
1352 }
1d4b027a 1353
5eb91c98
DG
1354 /* Event on the registration socket */
1355 if (pollfd == apps_sock) {
1356 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1357 ERR("Register apps socket poll error");
1358 goto error;
1359 } else if (revents & LPOLLIN) {
1360 sock = lttcomm_accept_unix_sock(apps_sock);
1361 if (sock < 0) {
1362 goto error;
1363 }
099e26bd 1364
5eb91c98 1365 /* Create UST registration command for enqueuing */
ba7f0ae5 1366 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1367 if (ust_cmd == NULL) {
ba7f0ae5 1368 perror("ust command zmalloc");
5eb91c98
DG
1369 goto error;
1370 }
1d4b027a 1371
5eb91c98
DG
1372 /*
1373 * Using message-based transmissions to ensure we don't
1374 * have to deal with partially received messages.
1375 */
1376 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1377 sizeof(struct ust_register_msg));
1378 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1379 if (ret < 0) {
1380 perror("lttcomm_recv_unix_sock register apps");
1381 } else {
1382 ERR("Wrong size received on apps register");
1383 }
1384 free(ust_cmd);
1385 close(sock);
1386 continue;
1387 }
099e26bd 1388
5eb91c98 1389 ust_cmd->sock = sock;
099e26bd 1390
5eb91c98
DG
1391 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1392 " gid:%d sock:%d name:%s (version %d.%d)",
1393 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1394 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1395 ust_cmd->sock, ust_cmd->reg_msg.name,
1396 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1397
5eb91c98
DG
1398 /*
1399 * Lock free enqueue the registration request. The red pill
54d01ffb 1400 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1401 */
1402 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1403
1404 /*
1405 * Wake the registration queue futex. Implicit memory
1406 * barrier with the exchange in cds_wfq_enqueue.
1407 */
1408 futex_nto1_wake(&ust_cmd_queue.futex);
1409 }
1410 }
90014c57 1411 }
1d4b027a
DG
1412 }
1413
1414error:
0fdd1e2c
DG
1415 DBG("UST Registration thread dying");
1416
1417 /* Notify that the registration thread is gone */
1418 notify_ust_apps(0);
1419
a4b35e07
MD
1420 if (apps_sock >= 0) {
1421 close(apps_sock);
1422 }
1423 if (clock >= 0) {
1424 close(sock);
1425 }
273ea72c 1426 unlink(apps_unix_sock_path);
0fdd1e2c 1427
5eb91c98
DG
1428 lttng_poll_clean(&events);
1429
1d4b027a
DG
1430 return NULL;
1431}
1432
8c0faa1d 1433/*
3bd1e081 1434 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1435 * exec or it will fails.
8c0faa1d 1436 */
3bd1e081 1437static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1438{
1439 int ret;
ee0b0061
DG
1440 struct timespec timeout;
1441
1442 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1443 timeout.tv_nsec = 0;
8c0faa1d
DG
1444
1445 /* Setup semaphore */
3bd1e081 1446 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1447 if (ret < 0) {
3bd1e081 1448 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1449 goto error;
1450 }
8c0faa1d 1451
3bd1e081
MD
1452 ret = pthread_create(&consumer_data->thread, NULL,
1453 thread_manage_consumer, consumer_data);
8c0faa1d 1454 if (ret != 0) {
3bd1e081 1455 PERROR("pthread_create consumer");
ee0b0061 1456 ret = -1;
8c0faa1d
DG
1457 goto error;
1458 }
1459
ee0b0061
DG
1460 /* Get time for sem_timedwait absolute timeout */
1461 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1462 if (ret < 0) {
3bd1e081 1463 PERROR("clock_gettime spawn consumer");
ee0b0061 1464 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1465 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1466 } else {
1467 /* Normal timeout if the gettime was successful */
1468 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1469 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1470 }
8c0faa1d 1471
ee0b0061
DG
1472 if (ret < 0) {
1473 if (errno == ETIMEDOUT) {
1474 /*
1475 * Call has timed out so we kill the kconsumerd_thread and return
1476 * an error.
1477 */
3bd1e081
MD
1478 ERR("The consumer thread was never ready. Killing it");
1479 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1480 if (ret < 0) {
3bd1e081 1481 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1482 }
1483 } else {
3bd1e081 1484 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1485 }
1486 goto error;
1487 }
1488
3bd1e081
MD
1489 pthread_mutex_lock(&consumer_data->pid_mutex);
1490 if (consumer_data->pid == 0) {
712ea556 1491 ERR("Kconsumerd did not start");
3bd1e081 1492 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1493 goto error;
1494 }
3bd1e081 1495 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1496
8c0faa1d
DG
1497 return 0;
1498
1499error:
1500 return ret;
1501}
1502
d9800920 1503/*
3bd1e081 1504 * Join consumer thread
d9800920 1505 */
3bd1e081 1506static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1507{
1508 void *status;
1509 int ret;
1510
3bd1e081
MD
1511 if (consumer_data->pid != 0) {
1512 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1513 if (ret) {
3bd1e081 1514 ERR("Error killing consumer daemon");
cf3af59e
MD
1515 return ret;
1516 }
3bd1e081 1517 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1518 } else {
1519 return 0;
1520 }
1521}
1522
8c0faa1d 1523/*
3bd1e081 1524 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1525 *
d063d709 1526 * Return pid if successful else -1.
8c0faa1d 1527 */
3bd1e081 1528static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1529{
1530 int ret;
1531 pid_t pid;
94c55f17 1532 const char *consumer_to_use;
53086306 1533 const char *verbosity;
94c55f17 1534 struct stat st;
8c0faa1d 1535
3bd1e081 1536 DBG("Spawning consumerd");
c49dc785 1537
8c0faa1d
DG
1538 pid = fork();
1539 if (pid == 0) {
1540 /*
3bd1e081 1541 * Exec consumerd.
8c0faa1d 1542 */
daee5345 1543 if (opt_verbose_consumer) {
53086306
DG
1544 verbosity = "--verbose";
1545 } else {
1546 verbosity = "--quiet";
1547 }
3bd1e081
MD
1548 switch (consumer_data->type) {
1549 case LTTNG_CONSUMER_KERNEL:
94c55f17 1550 /*
c7704d57
DG
1551 * Find out which consumerd to execute. We will first try the
1552 * 64-bit path, then the sessiond's installation directory, and
1553 * fallback on the 32-bit one,
94c55f17 1554 */
63a799e8
AM
1555 DBG3("Looking for a kernel consumer at these locations:");
1556 DBG3(" 1) %s", consumerd64_bin);
1557 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1558 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1559 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1560 DBG3("Found location #1");
94c55f17 1561 consumer_to_use = consumerd64_bin;
94c55f17 1562 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1563 DBG3("Found location #2");
94c55f17 1564 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1565 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1566 DBG3("Found location #3");
eb1e0bd4 1567 consumer_to_use = consumerd32_bin;
94c55f17 1568 } else {
63a799e8 1569 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1570 break;
1571 }
1572 DBG("Using kernel consumer at: %s", consumer_to_use);
1573 execl(consumer_to_use,
1574 "lttng-consumerd", verbosity, "-k",
1575 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1576 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1577 NULL);
3bd1e081 1578 break;
7753dea8
MD
1579 case LTTNG_CONSUMER64_UST:
1580 {
b1e0b6b6 1581 char *tmpnew = NULL;
8f4905da
MD
1582
1583 if (consumerd64_libdir[0] != '\0') {
1584 char *tmp;
1585 size_t tmplen;
1586
1587 tmp = getenv("LD_LIBRARY_PATH");
1588 if (!tmp) {
1589 tmp = "";
1590 }
1591 tmplen = strlen("LD_LIBRARY_PATH=")
1592 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1593 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1594 if (!tmpnew) {
1595 ret = -ENOMEM;
1596 goto error;
1597 }
1598 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1599 strcat(tmpnew, consumerd64_libdir);
1600 if (tmp[0] != '\0') {
1601 strcat(tmpnew, ":");
1602 strcat(tmpnew, tmp);
1603 }
1604 ret = putenv(tmpnew);
1605 if (ret) {
1606 ret = -errno;
1607 goto error;
1608 }
1609 }
94c55f17 1610 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1611 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1612 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1613 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1614 NULL);
8f4905da
MD
1615 if (consumerd64_libdir[0] != '\0') {
1616 free(tmpnew);
1617 }
1618 if (ret) {
1619 goto error;
1620 }
3bd1e081 1621 break;
7753dea8
MD
1622 }
1623 case LTTNG_CONSUMER32_UST:
1624 {
937dde8e 1625 char *tmpnew = NULL;
8f4905da
MD
1626
1627 if (consumerd32_libdir[0] != '\0') {
1628 char *tmp;
1629 size_t tmplen;
1630
1631 tmp = getenv("LD_LIBRARY_PATH");
1632 if (!tmp) {
1633 tmp = "";
1634 }
1635 tmplen = strlen("LD_LIBRARY_PATH=")
1636 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1637 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1638 if (!tmpnew) {
1639 ret = -ENOMEM;
1640 goto error;
1641 }
1642 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1643 strcat(tmpnew, consumerd32_libdir);
1644 if (tmp[0] != '\0') {
1645 strcat(tmpnew, ":");
1646 strcat(tmpnew, tmp);
1647 }
1648 ret = putenv(tmpnew);
1649 if (ret) {
1650 ret = -errno;
1651 goto error;
1652 }
1653 }
94c55f17 1654 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1655 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1656 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1657 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1658 NULL);
8f4905da
MD
1659 if (consumerd32_libdir[0] != '\0') {
1660 free(tmpnew);
1661 }
1662 if (ret) {
1663 goto error;
1664 }
7753dea8
MD
1665 break;
1666 }
3bd1e081
MD
1667 default:
1668 perror("unknown consumer type");
1669 exit(EXIT_FAILURE);
1670 }
8c0faa1d
DG
1671 if (errno != 0) {
1672 perror("kernel start consumer exec");
1673 }
1674 exit(EXIT_FAILURE);
1675 } else if (pid > 0) {
1676 ret = pid;
8c0faa1d 1677 } else {
3bd1e081 1678 perror("start consumer fork");
8c0faa1d 1679 ret = -errno;
8c0faa1d 1680 }
8f4905da 1681error:
8c0faa1d
DG
1682 return ret;
1683}
1684
693bd40b 1685/*
3bd1e081 1686 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1687 */
3bd1e081 1688static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1689{
1690 int ret;
1691
3bd1e081
MD
1692 pthread_mutex_lock(&consumer_data->pid_mutex);
1693 if (consumer_data->pid != 0) {
1694 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1695 goto end;
1696 }
693bd40b 1697
3bd1e081 1698 ret = spawn_consumerd(consumer_data);
c49dc785 1699 if (ret < 0) {
3bd1e081
MD
1700 ERR("Spawning consumerd failed");
1701 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1702 goto error;
693bd40b 1703 }
c49dc785 1704
3bd1e081
MD
1705 /* Setting up the consumer_data pid */
1706 consumer_data->pid = ret;
48842b30 1707 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1708 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1709
3bd1e081
MD
1710 DBG2("Spawning consumer control thread");
1711 ret = spawn_consumer_thread(consumer_data);
693bd40b 1712 if (ret < 0) {
3bd1e081 1713 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1714 goto error;
1715 }
1716
c49dc785 1717end:
693bd40b
DG
1718 return 0;
1719
1720error:
1721 return ret;
1722}
1723
b73401da 1724/*
096102bd 1725 * Check version of the lttng-modules.
b73401da 1726 */
096102bd 1727static int validate_lttng_modules_version(void)
b73401da 1728{
096102bd 1729 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1730}
1731
b73401da 1732/*
096102bd 1733 * Setup necessary data for kernel tracer action.
b73401da 1734 */
096102bd 1735static int init_kernel_tracer(void)
b73401da
DG
1736{
1737 int ret;
b73401da 1738
096102bd
DG
1739 /* Modprobe lttng kernel modules */
1740 ret = modprobe_lttng_control();
b73401da 1741 if (ret < 0) {
b73401da
DG
1742 goto error;
1743 }
1744
096102bd
DG
1745 /* Open debugfs lttng */
1746 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1747 if (kernel_tracer_fd < 0) {
1748 DBG("Failed to open %s", module_proc_lttng);
1749 ret = -1;
1750 goto error_open;
b73401da
DG
1751 }
1752
096102bd
DG
1753 /* Validate kernel version */
1754 ret = validate_lttng_modules_version();
b73401da 1755 if (ret < 0) {
096102bd 1756 goto error_version;
b73401da
DG
1757 }
1758
096102bd 1759 ret = modprobe_lttng_data();
b73401da 1760 if (ret < 0) {
096102bd 1761 goto error_modules;
8c0faa1d
DG
1762 }
1763
f3ed775e 1764 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1765 return 0;
1766
1767error_version:
1768 modprobe_remove_lttng_control();
1769 close(kernel_tracer_fd);
1770 kernel_tracer_fd = 0;
1771 return LTTCOMM_KERN_VERSION;
1772
1773error_modules:
1774 close(kernel_tracer_fd);
1775
1776error_open:
1777 modprobe_remove_lttng_control();
b73401da
DG
1778
1779error:
b73401da 1780 WARN("No kernel tracer available");
a4b35e07 1781 kernel_tracer_fd = -1;
096102bd 1782 return LTTCOMM_KERN_NA;
f3ed775e 1783}
33a2b854 1784
f3ed775e 1785/*
54d01ffb 1786 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1787 */
54d01ffb 1788static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1789{
f40799e8 1790 int ret = 0;
8c0faa1d 1791
3bd1e081 1792 if (session->consumer_fds_sent == 0) {
d9800920 1793 /*
54d01ffb
DG
1794 * Assign default kernel consumer socket if no consumer assigned to the
1795 * kernel session. At this point, it's NOT suppose to be 0 but this is
1796 * an extra security check.
d9800920
DG
1797 */
1798 if (session->consumer_fd == 0) {
3bd1e081 1799 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1800 }
1801
2bdd86d4 1802 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1803 if (ret < 0) {
f3ed775e
DG
1804 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1805 goto error;
1806 }
1d4b027a 1807
3bd1e081 1808 session->consumer_fds_sent = 1;
f3ed775e 1809 }
1d4b027a
DG
1810
1811error:
1812 return ret;
8c0faa1d
DG
1813}
1814
0177d773
DG
1815/*
1816 * Create an UST session and add it to the session ust list.
1817 */
44d3bd01 1818static int create_ust_session(struct ltt_session *session,
6df2e2c9 1819 struct lttng_domain *domain)
0177d773 1820{
13384287 1821 struct ltt_ust_session *lus = NULL;
6df2e2c9 1822 int ret;
44d3bd01
DG
1823
1824 switch (domain->type) {
48842b30 1825 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1826 break;
1827 default:
13384287 1828 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1829 goto error;
1830 }
0177d773
DG
1831
1832 DBG("Creating UST session");
1833
a991f516 1834 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1835 if (lus == NULL) {
44d3bd01 1836 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1837 goto error;
1838 }
1839
e11d277b 1840 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1841 session->uid, session->gid);
0177d773
DG
1842 if (ret < 0) {
1843 if (ret != -EEXIST) {
1844 ERR("Trace directory creation error");
44d3bd01 1845 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1846 goto error;
1847 }
1848 }
1849
f6a9efaa
DG
1850 /* The domain type dictate different actions on session creation */
1851 switch (domain->type) {
48842b30
DG
1852 case LTTNG_DOMAIN_UST:
1853 /* No ustctl for the global UST domain */
1854 break;
1855 default:
36dc12cc 1856 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1857 goto error;
0177d773 1858 }
6df2e2c9
MD
1859 lus->uid = session->uid;
1860 lus->gid = session->gid;
f6a9efaa 1861 session->ust_session = lus;
44d3bd01
DG
1862
1863 return LTTCOMM_OK;
0177d773
DG
1864
1865error:
1866 free(lus);
1867 return ret;
1868}
1869
333f285e 1870/*
d063d709 1871 * Create a kernel tracer session then create the default channel.
333f285e 1872 */
6df2e2c9 1873static int create_kernel_session(struct ltt_session *session)
333f285e 1874{
f3ed775e 1875 int ret;
f3ed775e
DG
1876
1877 DBG("Creating kernel session");
1878
1879 ret = kernel_create_session(session, kernel_tracer_fd);
1880 if (ret < 0) {
1881 ret = LTTCOMM_KERN_SESS_FAIL;
1882 goto error;
333f285e
DG
1883 }
1884
d9800920 1885 /* Set kernel consumer socket fd */
3bd1e081
MD
1886 if (kconsumer_data.cmd_sock) {
1887 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1888 }
1889
e11d277b 1890 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1891 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1892 if (ret < 0) {
996b65c8 1893 if (ret != -EEXIST) {
7a485870
DG
1894 ERR("Trace directory creation error");
1895 goto error;
1896 }
1897 }
6df2e2c9
MD
1898 session->kernel_session->uid = session->uid;
1899 session->kernel_session->gid = session->gid;
7a485870 1900
f3ed775e
DG
1901error:
1902 return ret;
333f285e
DG
1903}
1904
8e0af1b4 1905/*
c7704d57
DG
1906 * Check if the UID or GID match the session. Root user has access to all
1907 * sessions.
8e0af1b4 1908 */
c7704d57 1909static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1910{
c7704d57 1911 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
1912 return 0;
1913 } else {
1914 return 1;
1915 }
1916}
1917
1918static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1919{
1920 unsigned int i = 0;
1921 struct ltt_session *session;
1922
1923 DBG("Counting number of available session for UID %d GID %d",
1924 uid, gid);
1925 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1926 /*
1927 * Only list the sessions the user can control.
1928 */
1929 if (!session_access_ok(session, uid, gid)) {
1930 continue;
1931 }
1932 i++;
1933 }
1934 return i;
1935}
1936
6c9cc2ab
DG
1937/*
1938 * Using the session list, filled a lttng_session array to send back to the
1939 * client for session listing.
1940 *
1941 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1942 * session_lock_list() and session_unlock_list().
6c9cc2ab 1943 */
c7704d57
DG
1944static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1945 gid_t gid)
6c9cc2ab 1946{
8e0af1b4 1947 unsigned int i = 0;
6c9cc2ab
DG
1948 struct ltt_session *session;
1949
8e0af1b4
MD
1950 DBG("Getting all available session for UID %d GID %d",
1951 uid, gid);
6c9cc2ab
DG
1952 /*
1953 * Iterate over session list and append data after the control struct in
1954 * the buffer.
1955 */
1956 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
1957 /*
1958 * Only list the sessions the user can control.
1959 */
1960 if (!session_access_ok(session, uid, gid)) {
1961 continue;
1962 }
6c9cc2ab 1963 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1964 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1965 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1966 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1967 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1968 i++;
1969 }
1970}
1971
9f19cc17
DG
1972/*
1973 * Fill lttng_channel array of all channels.
1974 */
b551a063 1975static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1976 struct lttng_channel *channels)
1977{
1978 int i = 0;
1979 struct ltt_kernel_channel *kchan;
1980
1981 DBG("Listing channels for session %s", session->name);
1982
b551a063
DG
1983 switch (domain) {
1984 case LTTNG_DOMAIN_KERNEL:
1985 /* Kernel channels */
1986 if (session->kernel_session != NULL) {
1987 cds_list_for_each_entry(kchan,
1988 &session->kernel_session->channel_list.head, list) {
1989 /* Copy lttng_channel struct to array */
1990 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1991 channels[i].enabled = kchan->enabled;
1992 i++;
1993 }
1994 }
1995 break;
1996 case LTTNG_DOMAIN_UST:
1997 {
bec39940 1998 struct lttng_ht_iter iter;
b551a063
DG
1999 struct ltt_ust_channel *uchan;
2000
bec39940
DG
2001 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2002 &iter.iter, uchan, node.node) {
b551a063
DG
2003 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2004 channels[i].attr.overwrite = uchan->attr.overwrite;
2005 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2006 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2007 channels[i].attr.switch_timer_interval =
2008 uchan->attr.switch_timer_interval;
2009 channels[i].attr.read_timer_interval =
2010 uchan->attr.read_timer_interval;
aea829b3 2011 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2012 switch (uchan->attr.output) {
2013 case LTTNG_UST_MMAP:
2014 default:
2015 channels[i].attr.output = LTTNG_EVENT_MMAP;
2016 break;
2017 }
befe0905 2018 i++;
b551a063
DG
2019 }
2020 break;
2021 }
2022 default:
2023 break;
2024 }
2025}
2026
2027/*
2028 * Create a list of ust global domain events.
2029 */
2030static int list_lttng_ust_global_events(char *channel_name,
2031 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2032{
2033 int i = 0, ret = 0;
2034 unsigned int nb_event = 0;
bec39940
DG
2035 struct lttng_ht_iter iter;
2036 struct lttng_ht_node_str *node;
b551a063
DG
2037 struct ltt_ust_channel *uchan;
2038 struct ltt_ust_event *uevent;
2039 struct lttng_event *tmp;
2040
2041 DBG("Listing UST global events for channel %s", channel_name);
2042
2043 rcu_read_lock();
2044
bec39940
DG
2045 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2046 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2047 if (node == NULL) {
2048 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2049 goto error;
b551a063
DG
2050 }
2051
bec39940 2052 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2053
bec39940 2054 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2055
b551a063
DG
2056 if (nb_event == 0) {
2057 ret = nb_event;
2058 goto error;
2059 }
2060
2061 DBG3("Listing UST global %d events", nb_event);
2062
2063 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2064 if (tmp == NULL) {
2065 ret = -LTTCOMM_FATAL;
2066 goto error;
2067 }
2068
bec39940 2069 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2070 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2071 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2072 tmp[i].enabled = uevent->enabled;
2073 switch (uevent->attr.instrumentation) {
2074 case LTTNG_UST_TRACEPOINT:
2075 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2076 break;
2077 case LTTNG_UST_PROBE:
2078 tmp[i].type = LTTNG_EVENT_PROBE;
2079 break;
2080 case LTTNG_UST_FUNCTION:
2081 tmp[i].type = LTTNG_EVENT_FUNCTION;
2082 break;
0cda4f28 2083 }
8005f29a 2084 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2085 switch (uevent->attr.loglevel_type) {
8005f29a 2086 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2087 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2088 break;
8005f29a 2089 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2090 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2091 break;
2092 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2093 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2094 break;
9f19cc17 2095 }
d7b75b30 2096 i++;
9f19cc17
DG
2097 }
2098
b551a063
DG
2099 ret = nb_event;
2100 *events = tmp;
2101
2102error:
2103 rcu_read_unlock();
2104 return ret;
9f19cc17
DG
2105}
2106
2107/*
b551a063 2108 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2109 */
b551a063
DG
2110static int list_lttng_kernel_events(char *channel_name,
2111 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2112{
b551a063
DG
2113 int i = 0, ret;
2114 unsigned int nb_event;
9f19cc17 2115 struct ltt_kernel_event *event;
b551a063
DG
2116 struct ltt_kernel_channel *kchan;
2117
2118 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2119 if (kchan == NULL) {
2120 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2121 goto error;
2122 }
2123
2124 nb_event = kchan->event_count;
9f19cc17
DG
2125
2126 DBG("Listing events for channel %s", kchan->channel->name);
2127
b551a063
DG
2128 if (nb_event == 0) {
2129 ret = nb_event;
2130 goto error;
2131 }
2132
2133 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2134 if (*events == NULL) {
2135 ret = LTTCOMM_FATAL;
2136 goto error;
2137 }
2138
9f19cc17
DG
2139 /* Kernel channels */
2140 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2141 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2142 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2143 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2144 switch (event->event->instrumentation) {
2145 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2146 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2147 break;
2148 case LTTNG_KERNEL_KPROBE:
2149 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2150 (*events)[i].type = LTTNG_EVENT_PROBE;
2151 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2152 sizeof(struct lttng_kernel_kprobe));
2153 break;
2154 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2155 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2156 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2157 sizeof(struct lttng_kernel_function));
2158 break;
0133c199 2159 case LTTNG_KERNEL_NOOP:
b551a063 2160 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2161 break;
a54bd42d 2162 case LTTNG_KERNEL_SYSCALL:
b551a063 2163 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2164 break;
7a3d1328
MD
2165 case LTTNG_KERNEL_ALL:
2166 assert(0);
2167 break;
9f19cc17
DG
2168 }
2169 i++;
2170 }
b551a063
DG
2171
2172 return nb_event;
2173
2174error:
2175 return ret;
9f19cc17
DG
2176}
2177
fac6795d 2178/*
54d01ffb 2179 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2180 */
54d01ffb
DG
2181static int cmd_disable_channel(struct ltt_session *session,
2182 int domain, char *channel_name)
fac6795d 2183{
54d01ffb 2184 int ret;
78f0bacd
DG
2185 struct ltt_ust_session *usess;
2186
2187 usess = session->ust_session;
379473d2 2188
54d01ffb 2189 switch (domain) {
78f0bacd
DG
2190 case LTTNG_DOMAIN_KERNEL:
2191 {
2192 ret = channel_kernel_disable(session->kernel_session,
2193 channel_name);
2194 if (ret != LTTCOMM_OK) {
2195 goto error;
2196 }
54d01ffb 2197
78f0bacd
DG
2198 kernel_wait_quiescent(kernel_tracer_fd);
2199 break;
2200 }
2201 case LTTNG_DOMAIN_UST:
2202 {
2203 struct ltt_ust_channel *uchan;
bec39940 2204 struct lttng_ht *chan_ht;
78f0bacd 2205
7885e399
DG
2206 chan_ht = usess->domain_global.channels;
2207
2208 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2209 if (uchan == NULL) {
2210 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2211 goto error;
78f0bacd
DG
2212 }
2213
7885e399
DG
2214 ret = channel_ust_disable(usess, domain, uchan);
2215 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2216 goto error;
2217 }
78f0bacd
DG
2218 break;
2219 }
d78d6610 2220#if 0
78f0bacd
DG
2221 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2222 case LTTNG_DOMAIN_UST_EXEC_NAME:
2223 case LTTNG_DOMAIN_UST_PID:
d78d6610 2224#endif
78f0bacd
DG
2225 default:
2226 ret = LTTCOMM_UNKNOWN_DOMAIN;
2227 goto error;
20fe2104
DG
2228 }
2229
54d01ffb 2230 ret = LTTCOMM_OK;
d65106b1 2231
54d01ffb
DG
2232error:
2233 return ret;
2234}
2235
2236/*
2237 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2238 */
44d3bd01 2239static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2240 int domain, struct lttng_channel *attr)
54d01ffb
DG
2241{
2242 int ret;
f6a9efaa 2243 struct ltt_ust_session *usess = session->ust_session;
bec39940 2244 struct lttng_ht *chan_ht;
f6a9efaa 2245
5d56b5aa 2246 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2247
aea829b3 2248 switch (domain) {
44d3bd01
DG
2249 case LTTNG_DOMAIN_KERNEL:
2250 {
2251 struct ltt_kernel_channel *kchan;
54d01ffb 2252
44d3bd01
DG
2253 kchan = trace_kernel_get_channel_by_name(attr->name,
2254 session->kernel_session);
2255 if (kchan == NULL) {
2256 ret = channel_kernel_create(session->kernel_session,
2257 attr, kernel_poll_pipe[1]);
2258 } else {
2259 ret = channel_kernel_enable(session->kernel_session, kchan);
2260 }
2261
2262 if (ret != LTTCOMM_OK) {
2263 goto error;
2264 }
2265
2266 kernel_wait_quiescent(kernel_tracer_fd);
2267 break;
2268 }
f6a9efaa
DG
2269 case LTTNG_DOMAIN_UST:
2270 {
2271 struct ltt_ust_channel *uchan;
2272
7885e399 2273 chan_ht = usess->domain_global.channels;
f6a9efaa 2274
7885e399 2275 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2276 if (uchan == NULL) {
7885e399 2277 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2278 } else {
7885e399 2279 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2280 }
f6a9efaa
DG
2281 break;
2282 }
d78d6610 2283#if 0
78f0bacd
DG
2284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2286 case LTTNG_DOMAIN_UST_PID:
d78d6610 2287#endif
44d3bd01
DG
2288 default:
2289 ret = LTTCOMM_UNKNOWN_DOMAIN;
2290 goto error;
54d01ffb
DG
2291 }
2292
54d01ffb
DG
2293error:
2294 return ret;
2295}
2296
2297/*
2298 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2299 */
2300static int cmd_disable_event(struct ltt_session *session, int domain,
2301 char *channel_name, char *event_name)
2302{
2303 int ret;
54d01ffb
DG
2304
2305 switch (domain) {
2306 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2307 {
2308 struct ltt_kernel_channel *kchan;
b0a40d28 2309 struct ltt_kernel_session *ksess;
2bdd86d4 2310
b0a40d28
DG
2311 ksess = session->kernel_session;
2312
2313 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2314 if (kchan == NULL) {
2315 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2316 goto error;
d65106b1
DG
2317 }
2318
b0a40d28 2319 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2320 if (ret != LTTCOMM_OK) {
2321 goto error;
2322 }
2323
2324 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2325 break;
2bdd86d4
MD
2326 }
2327 case LTTNG_DOMAIN_UST:
b0a40d28 2328 {
b0a40d28 2329 struct ltt_ust_channel *uchan;
7f79d3a1 2330 struct ltt_ust_session *usess;
b0a40d28
DG
2331
2332 usess = session->ust_session;
2333
2334 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2335 channel_name);
2336 if (uchan == NULL) {
2337 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2338 goto error;
2339 }
2340
7f79d3a1
DG
2341 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2342 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2343 goto error;
2344 }
2345
7f79d3a1 2346 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2347 channel_name);
b0a40d28
DG
2348 break;
2349 }
d78d6610 2350#if 0
2bdd86d4
MD
2351 case LTTNG_DOMAIN_UST_EXEC_NAME:
2352 case LTTNG_DOMAIN_UST_PID:
2353 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2354#endif
54d01ffb 2355 default:
1ab1ea0b 2356 ret = LTTCOMM_UND;
54d01ffb 2357 goto error;
d65106b1 2358 }
26cc6b4e 2359
54d01ffb
DG
2360 ret = LTTCOMM_OK;
2361
2362error:
2363 return ret;
2364}
2365
2366/*
2367 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2368 */
2369static int cmd_disable_event_all(struct ltt_session *session, int domain,
2370 char *channel_name)
2371{
2372 int ret;
54d01ffb
DG
2373
2374 switch (domain) {
2375 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2376 {
2377 struct ltt_kernel_session *ksess;
2378 struct ltt_kernel_channel *kchan;
2379
2380 ksess = session->kernel_session;
2381
2382 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2383 if (kchan == NULL) {
2384 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2385 goto error;
26cc6b4e
DG
2386 }
2387
9730260e 2388 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2389 if (ret != LTTCOMM_OK) {
0b97ec54 2390 goto error;
26cc6b4e
DG
2391 }
2392
54d01ffb 2393 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2394 break;
9730260e
DG
2395 }
2396 case LTTNG_DOMAIN_UST:
2397 {
2398 struct ltt_ust_session *usess;
2399 struct ltt_ust_channel *uchan;
2400
2401 usess = session->ust_session;
2402
2403 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2404 channel_name);
2405 if (uchan == NULL) {
2406 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2407 goto error;
2408 }
2409
7f79d3a1
DG
2410 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2411 if (ret != 0) {
9730260e
DG
2412 goto error;
2413 }
2414
7f79d3a1 2415 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2416
2417 break;
2418 }
d78d6610 2419#if 0
9730260e
DG
2420 case LTTNG_DOMAIN_UST_EXEC_NAME:
2421 case LTTNG_DOMAIN_UST_PID:
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2423#endif
54d01ffb 2424 default:
1ab1ea0b 2425 ret = LTTCOMM_UND;
54d01ffb 2426 goto error;
26cc6b4e 2427 }
e953ef25 2428
54d01ffb 2429 ret = LTTCOMM_OK;
e953ef25 2430
54d01ffb
DG
2431error:
2432 return ret;
2433}
f5177a38 2434
54d01ffb
DG
2435/*
2436 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2437 */
2438static int cmd_add_context(struct ltt_session *session, int domain,
2439 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2440{
2441 int ret;
f5177a38 2442
54d01ffb
DG
2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
2445 /* Add kernel context to kernel tracer */
2446 ret = context_kernel_add(session->kernel_session, ctx,
2447 event_name, channel_name);
2448 if (ret != LTTCOMM_OK) {
f5177a38 2449 goto error;
e953ef25 2450 }
2bdd86d4
MD
2451 break;
2452 case LTTNG_DOMAIN_UST:
2453 {
55cc08a6 2454 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2455
55cc08a6
DG
2456 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2457 if (ret != LTTCOMM_OK) {
2458 goto error;
2bdd86d4 2459 }
e953ef25 2460 break;
2bdd86d4 2461 }
d78d6610 2462#if 0
55cc08a6
DG
2463 case LTTNG_DOMAIN_UST_EXEC_NAME:
2464 case LTTNG_DOMAIN_UST_PID:
2465 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2466#endif
54d01ffb 2467 default:
1ab1ea0b 2468 ret = LTTCOMM_UND;
54d01ffb 2469 goto error;
e953ef25 2470 }
950131af 2471
54d01ffb 2472 ret = LTTCOMM_OK;
950131af 2473
54d01ffb
DG
2474error:
2475 return ret;
2476}
2477
2478/*
2479 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2480 */
2481static int cmd_enable_event(struct ltt_session *session, int domain,
2482 char *channel_name, struct lttng_event *event)
2483{
2484 int ret;
f6cd6b0f 2485 struct lttng_channel *attr;
48842b30 2486 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2487
2488 switch (domain) {
2489 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2490 {
2491 struct ltt_kernel_channel *kchan;
2492
54d01ffb
DG
2493 kchan = trace_kernel_get_channel_by_name(channel_name,
2494 session->kernel_session);
2495 if (kchan == NULL) {
f6cd6b0f
DG
2496 attr = channel_new_default_attr(domain);
2497 if (attr == NULL) {
2498 ret = LTTCOMM_FATAL;
2499 goto error;
2500 }
2501 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2502
54d01ffb 2503 /* This call will notify the kernel thread */
44d3bd01 2504 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2505 attr, kernel_poll_pipe[1]);
54d01ffb 2506 if (ret != LTTCOMM_OK) {
ff4d74e6 2507 free(attr);
f5177a38
DG
2508 goto error;
2509 }
ff4d74e6 2510 free(attr);
54d01ffb 2511 }
950131af 2512
54d01ffb
DG
2513 /* Get the newly created kernel channel pointer */
2514 kchan = trace_kernel_get_channel_by_name(channel_name,
2515 session->kernel_session);
2516 if (kchan == NULL) {
2517 /* This sould not happen... */
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
f5177a38 2521
48842b30
DG
2522 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2523 event);
54d01ffb 2524 if (ret != LTTCOMM_OK) {
f5177a38 2525 goto error;
950131af
DG
2526 }
2527
54d01ffb 2528 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2529 break;
2bdd86d4
MD
2530 }
2531 case LTTNG_DOMAIN_UST:
2532 {
aea829b3 2533 struct lttng_channel *attr;
edb67388 2534 struct ltt_ust_channel *uchan;
2bdd86d4 2535
edb67388 2536 /* Get channel from global UST domain */
48842b30
DG
2537 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2538 channel_name);
2539 if (uchan == NULL) {
aea829b3
DG
2540 /* Create default channel */
2541 attr = channel_new_default_attr(domain);
2542 if (attr == NULL) {
2543 ret = LTTCOMM_FATAL;
2544 goto error;
2545 }
596219f7 2546 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2547 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2548
7885e399 2549 ret = channel_ust_create(usess, domain, attr);
edb67388 2550 if (ret != LTTCOMM_OK) {
ff4d74e6 2551 free(attr);
aea829b3
DG
2552 goto error;
2553 }
aea829b3
DG
2554 free(attr);
2555
2556 /* Get the newly created channel reference back */
2557 uchan = trace_ust_find_channel_by_name(
2558 usess->domain_global.channels, channel_name);
2559 if (uchan == NULL) {
2560 /* Something is really wrong */
2561 ret = LTTCOMM_FATAL;
2562 goto error;
2563 }
48842b30 2564 }
2bdd86d4 2565
edb67388 2566 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2567 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2568 if (ret != LTTCOMM_OK) {
48842b30 2569 goto error;
2bdd86d4
MD
2570 }
2571 break;
2572 }
d78d6610 2573#if 0
2bdd86d4
MD
2574 case LTTNG_DOMAIN_UST_EXEC_NAME:
2575 case LTTNG_DOMAIN_UST_PID:
2576 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2577#endif
54d01ffb 2578 default:
1ab1ea0b 2579 ret = LTTCOMM_UND;
54d01ffb 2580 goto error;
950131af 2581 }
d36b8583 2582
54d01ffb 2583 ret = LTTCOMM_OK;
d36b8583 2584
54d01ffb
DG
2585error:
2586 return ret;
2587}
7d29a247 2588
54d01ffb
DG
2589/*
2590 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2591 */
2592static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2593 char *channel_name, int event_type)
54d01ffb
DG
2594{
2595 int ret;
2596 struct ltt_kernel_channel *kchan;
7d29a247 2597
54d01ffb
DG
2598 switch (domain) {
2599 case LTTNG_DOMAIN_KERNEL:
2600 kchan = trace_kernel_get_channel_by_name(channel_name,
2601 session->kernel_session);
2602 if (kchan == NULL) {
2603 /* This call will notify the kernel thread */
44d3bd01
DG
2604 ret = channel_kernel_create(session->kernel_session, NULL,
2605 kernel_poll_pipe[1]);
54d01ffb
DG
2606 if (ret != LTTCOMM_OK) {
2607 goto error;
d36b8583 2608 }
0d0c377a 2609
8f69e5eb
DG
2610 /* Get the newly created kernel channel pointer */
2611 kchan = trace_kernel_get_channel_by_name(channel_name,
2612 session->kernel_session);
2613 if (kchan == NULL) {
2614 /* This sould not happen... */
2615 ret = LTTCOMM_FATAL;
2616 goto error;
2617 }
2618
54d01ffb 2619 }
0fdd1e2c 2620
7a3d1328 2621 switch (event_type) {
76d45b40 2622 case LTTNG_EVENT_SYSCALL:
7a3d1328 2623 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2624 kchan, kernel_tracer_fd);
7a3d1328 2625 break;
76d45b40 2626 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2627 /*
7a3d1328
MD
2628 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2629 * events already registered to the channel.
8c9ae521 2630 */
7a3d1328
MD
2631 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2632 kchan, kernel_tracer_fd);
2633 break;
76d45b40 2634 case LTTNG_EVENT_ALL:
7a3d1328 2635 /* Enable syscalls and tracepoints */
8c9ae521
DG
2636 ret = event_kernel_enable_all(session->kernel_session,
2637 kchan, kernel_tracer_fd);
7a3d1328
MD
2638 break;
2639 default:
2640 ret = LTTCOMM_KERN_ENABLE_FAIL;
2641 goto error;
8c9ae521 2642 }
8f69e5eb
DG
2643
2644 /* Manage return value */
54d01ffb 2645 if (ret != LTTCOMM_OK) {
0d0c377a 2646 goto error;
d36b8583
DG
2647 }
2648
54d01ffb 2649 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2650 break;
76d45b40
DG
2651 case LTTNG_DOMAIN_UST:
2652 {
2653 struct lttng_channel *attr;
2654 struct ltt_ust_channel *uchan;
2655 struct ltt_ust_session *usess = session->ust_session;
2656
2657 /* Get channel from global UST domain */
2658 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2659 channel_name);
2660 if (uchan == NULL) {
2661 /* Create default channel */
2662 attr = channel_new_default_attr(domain);
2663 if (attr == NULL) {
2664 ret = LTTCOMM_FATAL;
2665 goto error;
2666 }
2667 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2668 attr->name[NAME_MAX - 1] = '\0';
2669
2670 /* Use the internal command enable channel */
7885e399 2671 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2672 if (ret != LTTCOMM_OK) {
2673 free(attr);
2674 goto error;
2675 }
2676 free(attr);
2677
2678 /* Get the newly created channel reference back */
2679 uchan = trace_ust_find_channel_by_name(
2680 usess->domain_global.channels, channel_name);
2681 if (uchan == NULL) {
2682 /* Something is really wrong */
2683 ret = LTTCOMM_FATAL;
2684 goto error;
2685 }
2686 }
2687
2688 /* At this point, the session and channel exist on the tracer */
2689
2690 switch (event_type) {
2691 case LTTNG_EVENT_ALL:
2692 case LTTNG_EVENT_TRACEPOINT:
2693 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2694 if (ret != LTTCOMM_OK) {
2695 goto error;
2696 }
2697 break;
2698 default:
2699 ret = LTTCOMM_UST_ENABLE_FAIL;
2700 goto error;
2701 }
2702
2703 /* Manage return value */
2704 if (ret != LTTCOMM_OK) {
2705 goto error;
2706 }
2707
2708 break;
2709 }
d78d6610 2710#if 0
76d45b40
DG
2711 case LTTNG_DOMAIN_UST_EXEC_NAME:
2712 case LTTNG_DOMAIN_UST_PID:
2713 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2714#endif
54d01ffb 2715 default:
1ab1ea0b 2716 ret = LTTCOMM_UND;
54d01ffb 2717 goto error;
d36b8583 2718 }
f3ed775e 2719
54d01ffb
DG
2720 ret = LTTCOMM_OK;
2721
2722error:
2723 return ret;
2724}
2725
2726/*
2727 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2728 */
2729static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2730{
2731 int ret;
2732 ssize_t nb_events = 0;
2733
2734 switch (domain) {
2735 case LTTNG_DOMAIN_KERNEL:
2736 nb_events = kernel_list_events(kernel_tracer_fd, events);
2737 if (nb_events < 0) {
2738 ret = LTTCOMM_KERN_LIST_FAIL;
2739 goto error;
894be886 2740 }
54d01ffb 2741 break;
b551a063
DG
2742 case LTTNG_DOMAIN_UST:
2743 nb_events = ust_app_list_events(events);
2744 if (nb_events < 0) {
2745 ret = LTTCOMM_UST_LIST_FAIL;
2746 goto error;
2747 }
2748 break;
54d01ffb 2749 default:
1ab1ea0b 2750 ret = LTTCOMM_UND;
54d01ffb
DG
2751 goto error;
2752 }
894be886 2753
54d01ffb 2754 return nb_events;
7d29a247 2755
54d01ffb
DG
2756error:
2757 /* Return negative value to differentiate return code */
2758 return -ret;
2759}
b389abbe 2760
54d01ffb
DG
2761/*
2762 * Command LTTNG_START_TRACE processed by the client thread.
2763 */
2764static int cmd_start_trace(struct ltt_session *session)
2765{
2766 int ret;
54d01ffb 2767 struct ltt_kernel_session *ksession;
b9d9b220 2768 struct ltt_ust_session *usess;
b389abbe 2769
54d01ffb
DG
2770 /* Short cut */
2771 ksession = session->kernel_session;
b9d9b220 2772 usess = session->ust_session;
5eb91c98 2773
b9ef1c83
DG
2774 if (session->enabled) {
2775 ret = LTTCOMM_UST_START_FAIL;
2776 goto error;
2777 }
2778
464dd62d
MD
2779 session->enabled = 1;
2780
54d01ffb
DG
2781 /* Kernel tracing */
2782 if (ksession != NULL) {
2bdd86d4
MD
2783 struct ltt_kernel_channel *kchan;
2784
54d01ffb
DG
2785 /* Open kernel metadata */
2786 if (ksession->metadata == NULL) {
2787 ret = kernel_open_metadata(ksession, ksession->trace_path);
2788 if (ret < 0) {
2789 ret = LTTCOMM_KERN_META_FAIL;
2790 goto error;
b389abbe 2791 }
54d01ffb 2792 }
7d29a247 2793
54d01ffb
DG
2794 /* Open kernel metadata stream */
2795 if (ksession->metadata_stream_fd == 0) {
2796 ret = kernel_open_metadata_stream(ksession);
2797 if (ret < 0) {
2798 ERR("Kernel create metadata stream failed");
2799 ret = LTTCOMM_KERN_STREAM_FAIL;
2800 goto error;
2801 }
2802 }
2803
2804 /* For each channel */
2805 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2806 if (kchan->stream_count == 0) {
2807 ret = kernel_open_channel_stream(kchan);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2810 goto error;
2811 }
54d01ffb
DG
2812 /* Update the stream global counter */
2813 ksession->stream_count_global += ret;
7d29a247 2814 }
54d01ffb
DG
2815 }
2816
2817 /* Setup kernel consumer socket and send fds to it */
2818 ret = init_kernel_tracing(ksession);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_START_FAIL;
2821 goto error;
2822 }
2823
2824 /* This start the kernel tracing */
2825 ret = kernel_start_session(ksession);
2826 if (ret < 0) {
2827 ret = LTTCOMM_KERN_START_FAIL;
2828 goto error;
2829 }
2830
2831 /* Quiescent wait after starting trace */
2832 kernel_wait_quiescent(kernel_tracer_fd);
2833 }
2834
36dc12cc 2835 /* Flag session that trace should start automatically */
b9d9b220
DG
2836 if (usess) {
2837 usess->start_trace = 1;
36dc12cc 2838
b9d9b220
DG
2839 ret = ust_app_start_trace_all(usess);
2840 if (ret < 0) {
2841 ret = LTTCOMM_UST_START_FAIL;
2842 goto error;
2843 }
2bdd86d4 2844 }
54d01ffb
DG
2845
2846 ret = LTTCOMM_OK;
2847
2848error:
2849 return ret;
2850}
2851
2852/*
2853 * Command LTTNG_STOP_TRACE processed by the client thread.
2854 */
2855static int cmd_stop_trace(struct ltt_session *session)
2856{
2857 int ret;
2858 struct ltt_kernel_channel *kchan;
2859 struct ltt_kernel_session *ksession;
8be98f9a 2860 struct ltt_ust_session *usess;
54d01ffb
DG
2861
2862 /* Short cut */
2863 ksession = session->kernel_session;
8be98f9a 2864 usess = session->ust_session;
54d01ffb 2865
b9ef1c83 2866 if (!session->enabled) {
190df5ac 2867 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG
2868 goto error;
2869 }
2870
464dd62d
MD
2871 session->enabled = 0;
2872
54d01ffb
DG
2873 /* Kernel tracer */
2874 if (ksession != NULL) {
2875 DBG("Stop kernel tracing");
2876
2877 /* Flush all buffers before stopping */
2878 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2879 if (ret < 0) {
2880 ERR("Kernel metadata flush failed");
2881 }
f34daff7 2882
54d01ffb
DG
2883 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2884 ret = kernel_flush_buffer(kchan);
0d0c377a 2885 if (ret < 0) {
54d01ffb 2886 ERR("Kernel flush buffer error");
7d29a247 2887 }
54d01ffb 2888 }
19e70852 2889
54d01ffb
DG
2890 ret = kernel_stop_session(ksession);
2891 if (ret < 0) {
2892 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2893 goto error;
f3ed775e 2894 }
54d01ffb
DG
2895
2896 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2897 }
54d01ffb 2898
8be98f9a
MD
2899 if (usess) {
2900 usess->start_trace = 0;
2bdd86d4 2901
8be98f9a 2902 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2903 if (ret < 0) {
190df5ac 2904 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
2905 goto error;
2906 }
2bdd86d4 2907 }
54d01ffb
DG
2908
2909 ret = LTTCOMM_OK;
2910
2911error:
2912 return ret;
2913}
2914
2915/*
2916 * Command LTTNG_CREATE_SESSION processed by the client thread.
2917 */
ca4537d3 2918static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG
2919{
2920 int ret;
2921
ca4537d3 2922 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG
2923 if (ret != LTTCOMM_OK) {
2924 goto error;
2925 }
2926
2927 ret = LTTCOMM_OK;
2928
2929error:
2930 return ret;
2931}
2932
2933/*
2934 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2935 */
2936static int cmd_destroy_session(struct ltt_session *session, char *name)
2937{
2938 int ret;
2939
2940 /* Clean kernel session teardown */
2941 teardown_kernel_session(session);
84cd17c6
MD
2942 /* UST session teardown */
2943 teardown_ust_session(session);
54d01ffb
DG
2944
2945 /*
2946 * Must notify the kernel thread here to update it's poll setin order
2947 * to remove the channel(s)' fd just destroyed.
2948 */
2949 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2950 if (ret < 0) {
2951 perror("write kernel poll pipe");
2952 }
2953
271933a4 2954 ret = session_destroy(session);
54d01ffb
DG
2955
2956 return ret;
2957}
2958
2959/*
2960 * Command LTTNG_CALIBRATE processed by the client thread.
2961 */
2962static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2963{
2964 int ret;
2965
2966 switch (domain) {
2967 case LTTNG_DOMAIN_KERNEL:
33a2b854 2968 {
54d01ffb 2969 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2970
54d01ffb
DG
2971 kcalibrate.type = calibrate->type;
2972 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2973 if (ret < 0) {
54d01ffb
DG
2974 ret = LTTCOMM_KERN_ENABLE_FAIL;
2975 goto error;
33a2b854 2976 }
54d01ffb
DG
2977 break;
2978 }
4466912f
DG
2979 case LTTNG_DOMAIN_UST:
2980 {
2981 struct lttng_ust_calibrate ucalibrate;
2982
2983 ucalibrate.type = calibrate->type;
2984 ret = ust_app_calibrate_glb(&ucalibrate);
2985 if (ret < 0) {
2986 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2987 goto error;
2988 }
2989 break;
2990 }
54d01ffb 2991 default:
1ab1ea0b 2992 ret = LTTCOMM_UND;
54d01ffb
DG
2993 goto error;
2994 }
33a2b854 2995
54d01ffb 2996 ret = LTTCOMM_OK;
33a2b854 2997
54d01ffb
DG
2998error:
2999 return ret;
3000}
7d29a247 3001
54d01ffb
DG
3002/*
3003 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3004 */
3005static int cmd_register_consumer(struct ltt_session *session, int domain,
3006 char *sock_path)
3007{
3008 int ret, sock;
b389abbe 3009
54d01ffb
DG
3010 switch (domain) {
3011 case LTTNG_DOMAIN_KERNEL:
3012 /* Can't register a consumer if there is already one */
48c4f28c 3013 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3014 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3015 goto error;
3016 }
3017
3018 sock = lttcomm_connect_unix_sock(sock_path);
3019 if (sock < 0) {
3020 ret = LTTCOMM_CONNECT_FAIL;
3021 goto error;
3022 }
3023
3024 session->kernel_session->consumer_fd = sock;
3025 break;
3026 default:
3027 /* TODO: Userspace tracing */
1ab1ea0b 3028 ret = LTTCOMM_UND;
54d01ffb
DG
3029 goto error;
3030 }
3031
3032 ret = LTTCOMM_OK;
3033
3034error:
3035 return ret;
3036}
3037
3038/*
3039 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3040 */
3041static ssize_t cmd_list_domains(struct ltt_session *session,
3042 struct lttng_domain **domains)
3043{
b551a063 3044 int ret, index = 0;
54d01ffb
DG
3045 ssize_t nb_dom = 0;
3046
3047 if (session->kernel_session != NULL) {
b551a063 3048 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3049 nb_dom++;
3050 }
3051
b551a063
DG
3052 if (session->ust_session != NULL) {
3053 DBG3("Listing domains found UST global domain");
3054 nb_dom++;
3055 }
54d01ffb 3056
b551a063 3057 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3058 if (*domains == NULL) {
3059 ret = -LTTCOMM_FATAL;
3060 goto error;
3061 }
3062
b551a063
DG
3063 if (session->kernel_session != NULL) {
3064 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3065 index++;
3066 }
3067
3068 if (session->ust_session != NULL) {
3069 (*domains)[index].type = LTTNG_DOMAIN_UST;
3070 index++;
3071 }
54d01ffb 3072
54d01ffb
DG
3073 return nb_dom;
3074
3075error:
3076 return ret;
3077}
3078
3079/*
3080 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3081 */
b551a063 3082static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3083 struct lttng_channel **channels)
3084{
3085 int ret;
3086 ssize_t nb_chan = 0;
3087
b551a063
DG
3088 switch (domain) {
3089 case LTTNG_DOMAIN_KERNEL:
3090 if (session->kernel_session != NULL) {
3091 nb_chan = session->kernel_session->channel_count;
3092 }
0df502fd 3093 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3094 break;
3095 case LTTNG_DOMAIN_UST:
3096 if (session->ust_session != NULL) {
bec39940 3097 nb_chan = lttng_ht_get_count(
b551a063
DG
3098 session->ust_session->domain_global.channels);
3099 }
0df502fd 3100 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3101 break;
3102 default:
3103 *channels = NULL;
1ab1ea0b 3104 ret = -LTTCOMM_UND;
54d01ffb
DG
3105 goto error;
3106 }
3107
b551a063
DG
3108 if (nb_chan > 0) {
3109 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3110 if (*channels == NULL) {
3111 ret = -LTTCOMM_FATAL;
3112 goto error;
3113 }
54d01ffb 3114
b551a063
DG
3115 list_lttng_channels(domain, session, *channels);
3116 } else {
3117 *channels = NULL;
3118 }
2bdd86d4 3119
54d01ffb
DG
3120 return nb_chan;
3121
3122error:
3123 return ret;
3124}
3125
3126/*
3127 * Command LTTNG_LIST_EVENTS processed by the client thread.
3128 */
b551a063 3129static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3130 char *channel_name, struct lttng_event **events)
3131{
b551a063 3132 int ret = 0;
54d01ffb 3133 ssize_t nb_event = 0;
54d01ffb 3134
b551a063
DG
3135 switch (domain) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (session->kernel_session != NULL) {
3138 nb_event = list_lttng_kernel_events(channel_name,
3139 session->kernel_session, events);
54d01ffb 3140 }
b551a063
DG
3141 break;
3142 case LTTNG_DOMAIN_UST:
3143 {
3144 if (session->ust_session != NULL) {
3145 nb_event = list_lttng_ust_global_events(channel_name,
3146 &session->ust_session->domain_global, events);
3147 }
3148 break;
54d01ffb 3149 }
b551a063 3150 default:
1ab1ea0b 3151 ret = -LTTCOMM_UND;
54d01ffb
DG
3152 goto error;
3153 }
3154
b551a063 3155 ret = nb_event;
54d01ffb
DG
3156
3157error:
3158 return ret;
3159}
3160
3161/*
3162 * Process the command requested by the lttng client within the command
3163 * context structure. This function make sure that the return structure (llm)
3164 * is set and ready for transmission before returning.
3165 *
3166 * Return any error encountered or 0 for success.
3167 */
3168static int process_client_msg(struct command_ctx *cmd_ctx)
3169{
3170 int ret = LTTCOMM_OK;
44d3bd01 3171 int need_tracing_session = 1;
f84aa40a 3172 int need_domain;
54d01ffb
DG
3173
3174 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3175
f84aa40a
MD
3176 switch (cmd_ctx->lsm->cmd_type) {
3177 case LTTNG_CREATE_SESSION:
3178 case LTTNG_DESTROY_SESSION:
3179 case LTTNG_LIST_SESSIONS:
3180 case LTTNG_LIST_DOMAINS:
3181 case LTTNG_START_TRACE:
3182 case LTTNG_STOP_TRACE:
3183 need_domain = 0;
faf09bcf 3184 break;
f84aa40a
MD
3185 default:
3186 need_domain = 1;
3187 }
3188
3189 if (opt_no_kernel && need_domain
3190 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
4fba7219
DG
3191 ret = LTTCOMM_KERN_NA;
3192 goto error;
3193 }
3194
54d01ffb
DG
3195 /*
3196 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3197 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3198 * command.
3199 */
3200 switch(cmd_ctx->lsm->cmd_type) {
3201 case LTTNG_LIST_SESSIONS:
3202 case LTTNG_LIST_TRACEPOINTS:
3203 case LTTNG_LIST_DOMAINS:
3204 case LTTNG_LIST_CHANNELS:
3205 case LTTNG_LIST_EVENTS:
3206 break;
3207 default:
3208 /* Setup lttng message with no payload */
3209 ret = setup_lttng_msg(cmd_ctx, 0);
3210 if (ret < 0) {
3211 /* This label does not try to unlock the session */
3212 goto init_setup_error;
3213 }
3214 }
3215
3216 /* Commands that DO NOT need a session. */
3217 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 3218 case LTTNG_CREATE_SESSION:
f84aa40a 3219 case LTTNG_CALIBRATE:
54d01ffb
DG
3220 case LTTNG_LIST_SESSIONS:
3221 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3222 need_tracing_session = 0;
54d01ffb
DG
3223 break;
3224 default:
3225 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3226 session_lock_list();
54d01ffb 3227 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3228 session_unlock_list();
54d01ffb
DG
3229 if (cmd_ctx->session == NULL) {
3230 if (cmd_ctx->lsm->session.name != NULL) {
3231 ret = LTTCOMM_SESS_NOT_FOUND;
3232 } else {
3233 /* If no session name specified */
3234 ret = LTTCOMM_SELECT_SESS;