Rename sessiond internal "uid" fields to "id"
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
4771f025 53#include "kernel.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
ebaeda94
MD
60#define CONSUMERD_FILE "lttng-consumerd"
61
3bd1e081
MD
62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
fac6795d 86/* Variables */
1d4b027a 87int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 88int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 89int opt_quiet; /* Not static for lttngerr.h */
d063d709 90
fac6795d
DG
91const char *progname;
92const char *opt_tracing_group;
5b8719f5 93static int opt_sig_parent;
fac6795d 94static int opt_daemon;
4fba7219 95static int opt_no_kernel;
fac6795d 96static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 97static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 98static char *rundir;
3bd1e081
MD
99
100/* Consumer daemon specific control data */
101static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD
103 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 105};
7753dea8
MD
106static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
110};
111static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
115};
116
099e26bd 117static int dispatch_thread_exit;
fac6795d 118
54d01ffb
DG
119/* Global application Unix socket path */
120static char apps_unix_sock_path[PATH_MAX];
121/* Global client Unix socket path */
122static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
123/* global wait shm path for UST */
124static char wait_shm_path[PATH_MAX];
fac6795d 125
1d4b027a 126/* Sockets and FDs */
d6f42150
DG
127static int client_sock;
128static int apps_sock;
20fe2104 129static int kernel_tracer_fd;
7a485870 130static int kernel_poll_pipe[2];
1d4b027a 131
273ea72c
DG
132/*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136static int thread_quit_pipe[2];
137
099e26bd
DG
138/*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142static int apps_cmd_pipe[2];
143
1d4b027a 144/* Pthread, Mutexes and Semaphores */
1d4b027a 145static pthread_t apps_thread;
099e26bd 146static pthread_t reg_apps_thread;
1d4b027a 147static pthread_t client_thread;
7a485870 148static pthread_t kernel_thread;
099e26bd 149static pthread_t dispatch_thread;
5eb91c98 150
fac6795d 151
099e26bd
DG
152/*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159static struct ust_cmd_queue ust_cmd_queue;
160
b5541356
DG
161/*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
04ea676f 167 *
d063d709 168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 169 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
170 */
171static struct ltt_session_list *session_list_ptr;
172
7753dea8
MD
173int ust_consumerd64_fd = -1;
174int ust_consumerd32_fd = -1;
175
fc7a59ce
AM
176static const char *consumerd32_bin =
177 __stringify(CONFIG_CONSUMERD32_BIN);
178static const char *consumerd64_bin =
179 __stringify(CONFIG_CONSUMERD64_BIN);
ebaeda94
MD
180static const char *consumerd32_libdir =
181 __stringify(CONFIG_CONSUMERD32_LIBDIR);
182static const char *consumerd64_libdir =
183 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD
184
185static
7753dea8 186void setup_consumerd_path(void)
fb09408a 187{
fc7a59ce 188 const char *bin, *libdir;
fb09408a 189
7753dea8
MD
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
7753dea8 194 */
ebaeda94 195#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 205 }
ebaeda94
MD
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
208 }
209#else
210#error "Unknown bitness"
211#endif
212
fb09408a
MD
213 /*
214 * runtime env. var. overrides the build default.
215 */
fc7a59ce
AM
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
7753dea8 219 }
fc7a59ce
AM
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
ebaeda94
MD
223 }
224 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
fb09408a
MD
231 }
232}
233
5eb91c98
DG
234/*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239{
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260error:
261 return ret;
262}
263
264/*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269static int check_thread_quit_pipe(int fd, uint32_t events)
270{
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276}
277
0fdd1e2c
DG
278/*
279 * Remove modules in reverse load order.
280 */
281static int modprobe_remove_kernel_modules(void)
282{
283 int ret = 0, i;
284 char modprobe[256];
285
286 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
287 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 288 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
289 kernel_modules_list[i].name);
290 if (ret < 0) {
24b487b8 291 perror("snprintf modprobe -r");
0fdd1e2c
DG
292 goto error;
293 }
294 modprobe[sizeof(modprobe) - 1] = '\0';
295 ret = system(modprobe);
296 if (ret == -1) {
24b487b8 297 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
298 kernel_modules_list[i].name);
299 } else if (kernel_modules_list[i].required
300 && WEXITSTATUS(ret) != 0) {
301 ERR("Unable to remove module %s",
302 kernel_modules_list[i].name);
303 } else {
304 DBG("Modprobe removal successful %s",
305 kernel_modules_list[i].name);
306 }
307 }
308
309error:
310 return ret;
311}
312
313/*
314 * Return group ID of the tracing group or -1 if not found.
315 */
996b65c8
MD
316static gid_t allowed_group(void)
317{
318 struct group *grp;
319
274e143b
MD
320 if (opt_tracing_group) {
321 grp = getgrnam(opt_tracing_group);
322 } else {
323 grp = getgrnam(default_tracing_group);
324 }
996b65c8
MD
325 if (!grp) {
326 return -1;
327 } else {
328 return grp->gr_gid;
329 }
330}
331
273ea72c 332/*
5eb91c98 333 * Init thread quit pipe.
273ea72c
DG
334 *
335 * Return -1 on error or 0 if all pipes are created.
336 */
337static int init_thread_quit_pipe(void)
338{
339 int ret;
340
341 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
342 if (ret < 0) {
343 perror("thread quit pipe");
344 goto error;
345 }
346
347error:
348 return ret;
349}
350
fac6795d 351/*
d063d709
DG
352 * Complete teardown of a kernel session. This free all data structure related
353 * to a kernel session and update counter.
fac6795d 354 */
1d4b027a 355static void teardown_kernel_session(struct ltt_session *session)
fac6795d 356{
8f7a84dd
DG
357 if (!session->kernel_session) {
358 DBG3("No kernel session when tearingdown session");
84ea9c99 359 return;
8f7a84dd
DG
360 }
361
84ea9c99 362 DBG("Tearing down kernel session");
d9800920 363
84ea9c99
MD
364 /*
365 * If a custom kernel consumer was registered, close the socket before
366 * tearing down the complete kernel session structure
367 */
368 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 370 }
84ea9c99
MD
371
372 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
373}
374
f6a9efaa
DG
375/*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379static void teardown_ust_session(struct ltt_session *session)
380{
84cd17c6
MD
381 int ret;
382
8f7a84dd
DG
383 if (!session->ust_session) {
384 DBG3("No UST session when tearingdown session");
f470a390 385 return;
8f7a84dd
DG
386 }
387
84ea9c99 388 DBG("Tearing down UST session(s)");
8f7a84dd 389
84cd17c6
MD
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
8f7a84dd 394
f6a9efaa
DG
395 trace_ust_destroy_session(session->ust_session);
396}
397
099e26bd
DG
398/*
399 * Stop all threads by closing the thread quit pipe.
400 */
cf3af59e
MD
401static void stop_threads(void)
402{
5eb91c98
DG
403 int ret;
404
cf3af59e
MD
405 /* Stopping all threads */
406 DBG("Terminating all threads");
54d01ffb 407 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
099e26bd
DG
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
415}
416
fac6795d 417/*
d063d709 418 * Cleanup the daemon
fac6795d 419 */
cf3af59e 420static void cleanup(void)
fac6795d 421{
1d4b027a
DG
422 int ret;
423 char *cmd;
af9737e9 424 struct ltt_session *sess, *stmp;
fac6795d 425
1d4b027a 426 DBG("Cleaning up");
e07ae692 427
67e40797
DG
428 DBG("Removing %s directory", rundir);
429 ret = asprintf(&cmd, "rm -rf %s", rundir);
430 if (ret < 0) {
431 ERR("asprintf failed. Something is really wrong!");
432 }
5461b305 433
67e40797
DG
434 /* Remove lttng run directory */
435 ret = system(cmd);
436 if (ret < 0) {
437 ERR("Unable to clean %s", rundir);
1d4b027a 438 }
67e40797 439 free(cmd);
5461b305 440
1d4b027a 441 DBG("Cleaning up all session");
fac6795d 442
b5541356 443 /* Destroy session list mutex */
273ea72c
DG
444 if (session_list_ptr != NULL) {
445 pthread_mutex_destroy(&session_list_ptr->lock);
446
447 /* Cleanup ALL session */
54d01ffb
DG
448 cds_list_for_each_entry_safe(sess, stmp,
449 &session_list_ptr->head, list) {
273ea72c 450 teardown_kernel_session(sess);
f6a9efaa
DG
451 teardown_ust_session(sess);
452 free(sess);
273ea72c
DG
453 }
454 }
455
099e26bd 456 DBG("Closing all UST sockets");
56fff090 457 ust_app_clean_list();
099e26bd 458
3bd1e081 459 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 460
4fba7219
DG
461 if (is_root && !opt_no_kernel) {
462 DBG2("Closing kernel fd");
463 close(kernel_tracer_fd);
2f50c8a3
DG
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
5eb91c98
DG
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
421cb601
DG
470
471 /* <fun> */
f56a39af 472 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
fac6795d
DG
476}
477
e065084a 478/*
d063d709 479 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 480 *
d063d709 481 * Return lttcomm error code.
e065084a
DG
482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
5461b305 493/*
d063d709 494 * Free memory of a command context structure.
5461b305 495 */
a2fb29a5 496static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 497{
a2fb29a5
DG
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
5461b305 502 }
a2fb29a5
DG
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
5461b305 505 }
a2fb29a5
DG
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
5461b305
DG
508 }
509}
510
f3ed775e 511/*
d063d709 512 * Send all stream fds of kernel channel to the consumer.
f3ed775e 513 */
2bdd86d4 514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 515 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
516{
517 int ret;
f3ed775e 518 struct ltt_kernel_stream *stream;
3bd1e081 519 struct lttcomm_consumer_msg lkm;
f3ed775e 520
3bd1e081 521 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 522 channel->channel->name);
f3ed775e 523
3bd1e081
MD
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 531 if (ret < 0) {
3bd1e081 532 perror("send consumer channel");
f3ed775e
DG
533 goto error;
534 }
535
3bd1e081 536 /* Send streams */
7a485870 537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
f3ed775e
DG
559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG
563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG
575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG
580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 617 if (ret < 0) {
3bd1e081 618 perror("send consumer stream");
7a485870
DG
619 goto error;
620 }
621 }
f3ed775e 622
f3ed775e 623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
fac6795d 638/*
0fdd1e2c 639 * Notify UST applications using the shm mmap futex.
fac6795d 640 */
0fdd1e2c 641static int notify_ust_apps(int active)
fac6795d 642{
0fdd1e2c 643 char *wait_shm_mmap;
fac6795d 644
0fdd1e2c 645 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 646
0fdd1e2c
DG
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
fac6795d
DG
650 goto error;
651 }
652
0fdd1e2c
DG
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
fac6795d
DG
658
659error:
0fdd1e2c 660 return -1;
fac6795d
DG
661}
662
e065084a 663/*
d063d709
DG
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
ca95a216 667 *
d063d709 668 * Return total size of the buffer pointed by buf.
ca95a216 669 */
5461b305 670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 671{
f3ed775e 672 int ret, buf_size;
ca95a216 673
f3ed775e 674 buf_size = size;
5461b305 675
ba7f0ae5 676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 677 if (cmd_ctx->llm == NULL) {
ba7f0ae5 678 perror("zmalloc");
5461b305 679 ret = -ENOMEM;
ca95a216
DG
680 goto error;
681 }
682
5461b305
DG
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 686
5461b305
DG
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
ca95a216
DG
690 return buf_size;
691
692error:
693 return ret;
694}
695
7a485870 696/*
5eb91c98 697 * Update the kernel poll set of all channel fd available over all tracing
d063d709 698 * session. Add the wakeup pipe at the end of the set.
7a485870 699 */
5eb91c98 700static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 701{
5eb91c98 702 int ret;
7a485870
DG
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
5eb91c98 706 DBG("Updating kernel poll set");
7a485870 707
54d01ffb 708 session_lock_list();
b5541356 709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 710 session_lock(session);
7a485870 711 if (session->kernel_session == NULL) {
54d01ffb 712 session_unlock(session);
7a485870
DG
713 continue;
714 }
7a485870 715
54d01ffb
DG
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
54d01ffb 721 session_unlock(session);
5eb91c98
DG
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 725 }
54d01ffb 726 session_unlock(session);
7a485870 727 }
54d01ffb 728 session_unlock_list();
7a485870 729
5eb91c98 730 return 0;
7a485870
DG
731
732error:
54d01ffb 733 session_unlock_list();
7a485870
DG
734 return -1;
735}
736
737/*
54d01ffb 738 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 739 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 740 *
d063d709 741 * Useful for CPU hotplug feature.
7a485870 742 */
2bdd86d4 743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
54d01ffb 751 session_lock_list();
b5541356 752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 753 session_lock(session);
7a485870 754 if (session->kernel_session == NULL) {
54d01ffb 755 session_unlock(session);
7a485870
DG
756 continue;
757 }
d9800920
DG
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
762 }
763
5eb91c98
DG
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
7a485870
DG
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
b3c750d2 770 goto error;
7a485870 771 }
d9800920 772
7a485870 773 /*
5eb91c98
DG
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
7a485870 777 */
3bd1e081 778 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 779 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 780 session->kernel_session->consumer_fd, channel);
7a485870 781 if (ret < 0) {
b3c750d2 782 goto error;
7a485870
DG
783 }
784 }
b3c750d2 785 goto error;
7a485870
DG
786 }
787 }
54d01ffb 788 session_unlock(session);
7a485870 789 }
54d01ffb 790 session_unlock_list();
b3c750d2 791 return ret;
7a485870 792
b3c750d2 793error:
54d01ffb
DG
794 session_unlock(session);
795 session_unlock_list();
7a485870
DG
796 return ret;
797}
798
487cf67c
DG
799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
487cf67c
DG
811 }
812}
813
7a485870 814/*
d063d709 815 * This thread manage event coming from the kernel.
7a485870 816 *
d063d709
DG
817 * Features supported in this thread:
818 * -) CPU Hotplug
7a485870
DG
819 */
820static void *thread_manage_kernel(void *data)
821{
5eb91c98
DG
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
7a485870 824 char tmp;
5eb91c98 825 struct lttng_poll_event events;
7a485870
DG
826
827 DBG("Thread manage kernel started");
828
5eb91c98
DG
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
7a485870
DG
839 while (1) {
840 if (update_poll_flag == 1) {
5f822d0a
DG
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
5eb91c98
DG
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
7a485870
DG
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
5eb91c98
DG
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
7a485870
DG
860
861 /* Poll infinite value of time */
5eb91c98 862 ret = lttng_poll_wait(&events, -1);
7a485870 863 if (ret < 0) {
7a485870
DG
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
85611738
DG
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
7a485870
DG
869 continue;
870 }
871
5eb91c98
DG
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 876
5eb91c98
DG
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
7a485870 882
5eb91c98
DG
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
2bdd86d4 894 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
7a485870 903 }
7a485870
DG
904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
273ea72c
DG
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
5eb91c98
DG
912
913 lttng_poll_clean(&events);
914
7a485870
DG
915 return NULL;
916}
917
1d4b027a 918/*
3bd1e081 919 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 920 */
3bd1e081 921static void *thread_manage_consumer(void *data)
1d4b027a 922{
5eb91c98
DG
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
1d4b027a 925 enum lttcomm_return_code code;
5eb91c98 926 struct lttng_poll_event events;
3bd1e081 927 struct consumer_data *consumer_data = data;
1d4b027a 928
3bd1e081 929 DBG("[thread] Manage consumer started");
1d4b027a 930
3bd1e081 931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
932 if (ret < 0) {
933 goto error;
934 }
935
5eb91c98
DG
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
273ea72c 944
3bd1e081 945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
951
952 /* Inifinite blocking call, waiting for transmission */
5eb91c98 953 ret = lttng_poll_wait(&events, -1);
273ea72c 954 if (ret < 0) {
273ea72c
DG
955 goto error;
956 }
957
5eb91c98
DG
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
3bd1e081 970 if (pollfd == consumer_data->err_sock) {
5eb91c98 971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 972 ERR("consumer err socket poll error");
5eb91c98
DG
973 goto error;
974 }
975 }
273ea72c
DG
976 }
977
3bd1e081 978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
979 if (sock < 0) {
980 goto error;
981 }
982
3bd1e081 983 DBG2("Receiving code from consumer err_sock");
ee0b0061 984
712ea556 985 /* Getting status code from kconsumerd */
54d01ffb
DG
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
1d4b027a
DG
988 if (ret <= 0) {
989 goto error;
990 }
991
3bd1e081
MD
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
48842b30 997 PERROR("consumer connect");
1d4b027a
DG
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1d4b027a 1003 } else {
3bd1e081 1004 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
54d01ffb 1009 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1011 if (ret < 0) {
72079cae
DG
1012 goto error;
1013 }
1014
5eb91c98
DG
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
72079cae 1017 goto error;
5eb91c98
DG
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
72079cae
DG
1026 goto error;
1027 }
1028
5eb91c98
DG
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1043 ERR("consumer err socket second poll error");
5eb91c98
DG
1044 goto error;
1045 }
1046 }
1047 }
1048
712ea556 1049 /* Wait for any kconsumerd error */
54d01ffb
DG
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
712ea556 1052 if (ret <= 0) {
3bd1e081 1053 ERR("consumer closed the command socket");
712ea556 1054 goto error;
6f61d021 1055 }
1d4b027a 1056
3bd1e081 1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1058
1d4b027a 1059error:
3bd1e081
MD
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
5eb91c98 1063 close(sock);
273ea72c 1064
3bd1e081
MD
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1d4b027a 1068
5eb91c98 1069 lttng_poll_clean(&events);
0177d773 1070
5eb91c98 1071 return NULL;
099e26bd
DG
1072}
1073
099e26bd
DG
1074/*
1075 * This thread manage application communication.
1d4b027a
DG
1076 */
1077static void *thread_manage_apps(void *data)
099e26bd 1078{
5eb91c98
DG
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
099e26bd 1081 struct ust_command ust_cmd;
5eb91c98 1082 struct lttng_poll_event events;
099e26bd
DG
1083
1084 DBG("[thread] Manage application started");
1085
f6a9efaa
DG
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
5eb91c98
DG
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
099e26bd 1098
5eb91c98
DG
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
0177d773 1102
5eb91c98 1103 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1108 ret = lttng_poll_wait(&events, -1);
099e26bd 1109 if (ret < 0) {
099e26bd
DG
1110 goto error;
1111 }
1112
5eb91c98
DG
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
099e26bd 1121 goto error;
5eb91c98 1122 }
099e26bd 1123
5eb91c98
DG
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
0177d773 1128 goto error;
5eb91c98
DG
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
099e26bd 1136
5eb91c98 1137 /* Register applicaton to the session daemon */
56fff090 1138 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1139 ust_cmd.sock);
88ff5b7f 1140 if (ret == -ENOMEM) {
5eb91c98 1141 goto error;
88ff5b7f
MD
1142 } else if (ret < 0) {
1143 break;
5eb91c98
DG
1144 }
1145
acc7b41b
MD
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
5eb91c98
DG
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
56fff090 1158 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
54d01ffb
DG
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
5eb91c98 1171 }
487cf67c 1172
5eb91c98 1173 break;
0177d773 1174 }
5eb91c98
DG
1175 } else {
1176 /*
54d01ffb
DG
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
5eb91c98
DG
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
099e26bd 1186
b9d9b220 1187 /* Socket closed on remote end. */
56fff090 1188 ust_app_unregister(pollfd);
5eb91c98
DG
1189 break;
1190 }
099e26bd
DG
1191 }
1192 }
099e26bd
DG
1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
5eb91c98 1200 lttng_poll_clean(&events);
099e26bd 1201
f6a9efaa
DG
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
099e26bd
DG
1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
00a17c97 1227 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
2f50c8a3
DG
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1d4b027a 1275{
5eb91c98
DG
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
099e26bd
DG
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1d4b027a 1284
099e26bd 1285 DBG("[thread] Manage application registration started");
1d4b027a
DG
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
5eb91c98
DG
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
273ea72c 1300
5eb91c98
DG
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
273ea72c 1306
1d4b027a 1307 /* Notify all applications to register */
0fdd1e2c
DG
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
0fdd1e2c 1313 }
1d4b027a
DG
1314
1315 while (1) {
1316 DBG("Accepting application registration");
273ea72c 1317
5eb91c98
DG
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
273ea72c 1320 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1321 ret = lttng_poll_wait(&events, -1);
273ea72c 1322 if (ret < 0) {
273ea72c
DG
1323 goto error;
1324 }
1325
5eb91c98
DG
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1330
5eb91c98
DG
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
90014c57
DG
1334 goto error;
1335 }
1d4b027a 1336
5eb91c98
DG
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
099e26bd 1347
5eb91c98 1348 /* Create UST registration command for enqueuing */
ba7f0ae5 1349 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1350 if (ust_cmd == NULL) {
ba7f0ae5 1351 perror("ust command zmalloc");
5eb91c98
DG
1352 goto error;
1353 }
1d4b027a 1354
5eb91c98
DG
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
099e26bd 1371
5eb91c98 1372 ust_cmd->sock = sock;
099e26bd 1373
5eb91c98
DG
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1380
5eb91c98
DG
1381 /*
1382 * Lock free enqueue the registration request. The red pill
54d01ffb 1383 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
90014c57 1394 }
1d4b027a
DG
1395 }
1396
1397error:
0fdd1e2c
DG
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
273ea72c 1405 unlink(apps_unix_sock_path);
0fdd1e2c 1406
5eb91c98
DG
1407 lttng_poll_clean(&events);
1408
1d4b027a
DG
1409 return NULL;
1410}
1411
8c0faa1d 1412/*
3bd1e081 1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1414 * exec or it will fails.
8c0faa1d 1415 */
3bd1e081 1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1417{
1418 int ret;
ee0b0061
DG
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
8c0faa1d
DG
1423
1424 /* Setup semaphore */
3bd1e081 1425 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1426 if (ret < 0) {
3bd1e081 1427 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1428 goto error;
1429 }
8c0faa1d 1430
3bd1e081
MD
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
8c0faa1d 1433 if (ret != 0) {
3bd1e081 1434 PERROR("pthread_create consumer");
ee0b0061 1435 ret = -1;
8c0faa1d
DG
1436 goto error;
1437 }
1438
ee0b0061
DG
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
3bd1e081 1442 PERROR("clock_gettime spawn consumer");
ee0b0061 1443 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1444 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1449 }
8c0faa1d 1450
ee0b0061
DG
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
3bd1e081
MD
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1459 if (ret < 0) {
3bd1e081 1460 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1461 }
1462 } else {
3bd1e081 1463 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1464 }
1465 goto error;
1466 }
1467
3bd1e081
MD
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
712ea556 1470 ERR("Kconsumerd did not start");
3bd1e081 1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1472 goto error;
1473 }
3bd1e081 1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1475
8c0faa1d
DG
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
d9800920 1482/*
3bd1e081 1483 * Join consumer thread
d9800920 1484 */
3bd1e081 1485static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1486{
1487 void *status;
1488 int ret;
1489
3bd1e081
MD
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1492 if (ret) {
3bd1e081 1493 ERR("Error killing consumer daemon");
cf3af59e
MD
1494 return ret;
1495 }
3bd1e081 1496 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1497 } else {
1498 return 0;
1499 }
1500}
1501
8c0faa1d 1502/*
3bd1e081 1503 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1504 *
d063d709 1505 * Return pid if successful else -1.
8c0faa1d 1506 */
3bd1e081 1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1508{
1509 int ret;
1510 pid_t pid;
94c55f17 1511 const char *consumer_to_use;
53086306 1512 const char *verbosity;
94c55f17 1513 struct stat st;
8c0faa1d 1514
3bd1e081 1515 DBG("Spawning consumerd");
c49dc785 1516
8c0faa1d
DG
1517 pid = fork();
1518 if (pid == 0) {
1519 /*
3bd1e081 1520 * Exec consumerd.
8c0faa1d 1521 */
3bd1e081 1522 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
3bd1e081
MD
1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
94c55f17 1529 /*
f806231f
MD
1530 * Find out which consumerd to execute. We will
1531 * first try the 64-bit path, then the
1532 * sessiond's installation directory, and
1533 * fallback on the 32-bit one,
94c55f17
AM
1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
94c55f17
AM
1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4
MD
1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
94c55f17
AM
1541 } else {
1542 break;
1543 }
1544 DBG("Using kernel consumer at: %s", consumer_to_use);
1545 execl(consumer_to_use,
1546 "lttng-consumerd", verbosity, "-k",
1547 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1548 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1549 NULL);
3bd1e081 1550 break;
7753dea8
MD
1551 case LTTNG_CONSUMER64_UST:
1552 {
b1e0b6b6 1553 char *tmpnew = NULL;
8f4905da
MD
1554
1555 if (consumerd64_libdir[0] != '\0') {
1556 char *tmp;
1557 size_t tmplen;
1558
1559 tmp = getenv("LD_LIBRARY_PATH");
1560 if (!tmp) {
1561 tmp = "";
1562 }
1563 tmplen = strlen("LD_LIBRARY_PATH=")
1564 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1565 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1566 if (!tmpnew) {
1567 ret = -ENOMEM;
1568 goto error;
1569 }
1570 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1571 strcat(tmpnew, consumerd64_libdir);
1572 if (tmp[0] != '\0') {
1573 strcat(tmpnew, ":");
1574 strcat(tmpnew, tmp);
1575 }
1576 ret = putenv(tmpnew);
1577 if (ret) {
1578 ret = -errno;
1579 goto error;
1580 }
1581 }
94c55f17 1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1583 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
8f4905da
MD
1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
3bd1e081 1593 break;
7753dea8
MD
1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
937dde8e 1597 char *tmpnew = NULL;
8f4905da
MD
1598
1599 if (consumerd32_libdir[0] != '\0') {
1600 char *tmp;
1601 size_t tmplen;
1602
1603 tmp = getenv("LD_LIBRARY_PATH");
1604 if (!tmp) {
1605 tmp = "";
1606 }
1607 tmplen = strlen("LD_LIBRARY_PATH=")
1608 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1609 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1610 if (!tmpnew) {
1611 ret = -ENOMEM;
1612 goto error;
1613 }
1614 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1615 strcat(tmpnew, consumerd32_libdir);
1616 if (tmp[0] != '\0') {
1617 strcat(tmpnew, ":");
1618 strcat(tmpnew, tmp);
1619 }
1620 ret = putenv(tmpnew);
1621 if (ret) {
1622 ret = -errno;
1623 goto error;
1624 }
1625 }
94c55f17 1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1627 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
8f4905da
MD
1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
7753dea8
MD
1637 break;
1638 }
3bd1e081
MD
1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
8c0faa1d
DG
1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
8c0faa1d 1649 } else {
3bd1e081 1650 perror("start consumer fork");
8c0faa1d 1651 ret = -errno;
8c0faa1d 1652 }
8f4905da 1653error:
8c0faa1d
DG
1654 return ret;
1655}
1656
693bd40b 1657/*
3bd1e081 1658 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1659 */
3bd1e081 1660static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1661{
1662 int ret;
1663
3bd1e081
MD
1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1667 goto end;
1668 }
693bd40b 1669
3bd1e081 1670 ret = spawn_consumerd(consumer_data);
c49dc785 1671 if (ret < 0) {
3bd1e081
MD
1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1674 goto error;
693bd40b 1675 }
c49dc785 1676
3bd1e081
MD
1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
48842b30 1679 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1681
3bd1e081
MD
1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
693bd40b 1684 if (ret < 0) {
3bd1e081 1685 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1686 goto error;
1687 }
1688
c49dc785 1689end:
693bd40b
DG
1690 return 0;
1691
1692error:
1693 return ret;
1694}
1695
b73401da 1696/*
d063d709 1697 * modprobe_kernel_modules
b73401da
DG
1698 */
1699static int modprobe_kernel_modules(void)
1700{
ab147185 1701 int ret = 0, i;
b73401da
DG
1702 char modprobe[256];
1703
ab147185
MD
1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
24b487b8 1707 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1708 kernel_modules_list[i].name);
b73401da
DG
1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
ab147185 1713 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1714 ret = system(modprobe);
ab147185
MD
1715 if (ret == -1) {
1716 ERR("Unable to launch modprobe for module %s",
1717 kernel_modules_list[i].name);
1718 } else if (kernel_modules_list[i].required
d9800920 1719 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1720 ERR("Unable to load module %s",
1721 kernel_modules_list[i].name);
1722 } else {
1723 DBG("Modprobe successfully %s",
1724 kernel_modules_list[i].name);
1725 }
1726 }
1727
1728error:
1729 return ret;
1730}
1731
b73401da 1732/*
d063d709 1733 * mount_debugfs
b73401da
DG
1734 */
1735static int mount_debugfs(char *path)
1736{
1737 int ret;
1738 char *type = "debugfs";
1739
996b65c8 1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1741 if (ret < 0) {
7272acf5 1742 PERROR("Cannot create debugfs path");
b73401da
DG
1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
7272acf5 1748 PERROR("Cannot mount debugfs");
b73401da
DG
1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754error:
1755 return ret;
1756}
1757
8c0faa1d 1758/*
d063d709 1759 * Setup necessary data for kernel tracer action.
8c0faa1d 1760 */
f3ed775e 1761static void init_kernel_tracer(void)
8c0faa1d 1762{
b73401da
DG
1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
684d34d2 1766 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1767 FILE *fp;
1768
1769 /* Detect debugfs */
1770 fp = fopen(proc_mounts, "r");
1771 if (fp == NULL) {
1772 ERR("Unable to probe %s", proc_mounts);
1773 goto error;
1774 }
1775
1776 while (fgets(line, sizeof(line), fp) != NULL) {
1777 if (strstr(line, "debugfs") != NULL) {
1778 /* Remove first string */
1779 strtok(line, " ");
1780 /* Dup string here so we can reuse line later on */
1781 debugfs_path = strdup(strtok(NULL, " "));
1782 DBG("Got debugfs path : %s", debugfs_path);
1783 break;
1784 }
1785 }
1786
1787 fclose(fp);
1788
1789 /* Mount debugfs if needded */
1790 if (debugfs_path == NULL) {
1791 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1792 if (ret < 0) {
1793 perror("asprintf debugfs path");
1794 goto error;
1795 }
1796 ret = mount_debugfs(debugfs_path);
1797 if (ret < 0) {
7272acf5 1798 perror("Cannot mount debugfs");
b73401da
DG
1799 goto error;
1800 }
1801 }
1802
1803 /* Modprobe lttng kernel modules */
1804 ret = modprobe_kernel_modules();
1805 if (ret < 0) {
1806 goto error;
1807 }
1808
1809 /* Setup lttng kernel path */
1810 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1811 if (ret < 0) {
1812 perror("asprintf lttng path");
1813 goto error;
1814 }
1815
1816 /* Open debugfs lttng */
1817 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1818 if (kernel_tracer_fd < 0) {
b73401da
DG
1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
8c0faa1d
DG
1821 }
1822
b73401da
DG
1823 free(lttng_path);
1824 free(debugfs_path);
f3ed775e 1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1826 return;
1827
1828error:
1829 if (lttng_path) {
1830 free(lttng_path);
1831 }
1832 if (debugfs_path) {
1833 free(debugfs_path);
1834 }
1835 WARN("No kernel tracer available");
1836 kernel_tracer_fd = 0;
1837 return;
f3ed775e 1838}
33a2b854 1839
f3ed775e 1840/*
54d01ffb 1841 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1842 */
54d01ffb 1843static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1844{
f40799e8 1845 int ret = 0;
8c0faa1d 1846
3bd1e081 1847 if (session->consumer_fds_sent == 0) {
d9800920 1848 /*
54d01ffb
DG
1849 * Assign default kernel consumer socket if no consumer assigned to the
1850 * kernel session. At this point, it's NOT suppose to be 0 but this is
1851 * an extra security check.
d9800920
DG
1852 */
1853 if (session->consumer_fd == 0) {
3bd1e081 1854 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1855 }
1856
2bdd86d4 1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1858 if (ret < 0) {
f3ed775e
DG
1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1d4b027a 1862
3bd1e081 1863 session->consumer_fds_sent = 1;
f3ed775e 1864 }
1d4b027a
DG
1865
1866error:
1867 return ret;
8c0faa1d
DG
1868}
1869
0177d773
DG
1870/*
1871 * Create an UST session and add it to the session ust list.
1872 */
44d3bd01 1873static int create_ust_session(struct ltt_session *session,
be040666 1874 struct lttng_domain *domain, struct ucred *creds)
0177d773 1875{
44d3bd01 1876 int ret;
be040666 1877 gid_t gid;
13384287 1878 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1879
1880 switch (domain->type) {
48842b30 1881 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1882 break;
1883 default:
13384287 1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1885 goto error;
1886 }
0177d773
DG
1887
1888 DBG("Creating UST session");
1889
a991f516 1890 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1891 if (lus == NULL) {
44d3bd01 1892 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1893 goto error;
1894 }
1895
be040666
DG
1896 /*
1897 * Get the right group ID. To use the tracing group, the daemon must be
1898 * running with root credentials or else it's the user GID used.
1899 */
1900 gid = allowed_group();
1901 if (gid < 0 || !is_root) {
1902 gid = creds->gid;
1903 }
1904
1905 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, creds->uid, gid);
0177d773
DG
1906 if (ret < 0) {
1907 if (ret != -EEXIST) {
1908 ERR("Trace directory creation error");
44d3bd01 1909 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1910 goto error;
1911 }
1912 }
1913
f6a9efaa
DG
1914 /* The domain type dictate different actions on session creation */
1915 switch (domain->type) {
48842b30
DG
1916 case LTTNG_DOMAIN_UST:
1917 /* No ustctl for the global UST domain */
1918 break;
1919 default:
36dc12cc 1920 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1921 goto error;
0177d773 1922 }
f6a9efaa 1923 session->ust_session = lus;
44d3bd01
DG
1924
1925 return LTTCOMM_OK;
0177d773
DG
1926
1927error:
1928 free(lus);
1929 return ret;
1930}
1931
333f285e 1932/*
d063d709 1933 * Create a kernel tracer session then create the default channel.
333f285e 1934 */
be040666
DG
1935static int create_kernel_session(struct ltt_session *session,
1936 struct ucred *creds)
333f285e 1937{
f3ed775e 1938 int ret;
be040666 1939 gid_t gid;
f3ed775e
DG
1940
1941 DBG("Creating kernel session");
1942
1943 ret = kernel_create_session(session, kernel_tracer_fd);
1944 if (ret < 0) {
1945 ret = LTTCOMM_KERN_SESS_FAIL;
1946 goto error;
333f285e
DG
1947 }
1948
d9800920 1949 /* Set kernel consumer socket fd */
3bd1e081
MD
1950 if (kconsumer_data.cmd_sock) {
1951 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1952 }
1953
be040666
DG
1954 gid = allowed_group();
1955 if (gid < 0) {
1956 /*
1957 * Use GID 0 has a fallback since kernel session is only allowed under
1958 * root or the gid of the calling user
1959 */
1960 is_root ? (gid = 0) : (gid = creds->gid);
1961 }
1962
63053e7c 1963 ret = mkdir_recursive(session->kernel_session->trace_path,
be040666 1964 S_IRWXU | S_IRWXG, creds->uid, gid);
7a485870 1965 if (ret < 0) {
996b65c8 1966 if (ret != -EEXIST) {
7a485870
DG
1967 ERR("Trace directory creation error");
1968 goto error;
1969 }
1970 }
1971
f3ed775e
DG
1972error:
1973 return ret;
333f285e
DG
1974}
1975
6c9cc2ab
DG
1976/*
1977 * Using the session list, filled a lttng_session array to send back to the
1978 * client for session listing.
1979 *
1980 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1981 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1982 */
1983static void list_lttng_sessions(struct lttng_session *sessions)
1984{
1985 int i = 0;
1986 struct ltt_session *session;
1987
1988 DBG("Getting all available session");
1989 /*
1990 * Iterate over session list and append data after the control struct in
1991 * the buffer.
1992 */
1993 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1994 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1995 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1996 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1997 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1998 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1999 i++;
2000 }
2001}
2002
9f19cc17
DG
2003/*
2004 * Fill lttng_channel array of all channels.
2005 */
b551a063 2006static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2007 struct lttng_channel *channels)
2008{
2009 int i = 0;
2010 struct ltt_kernel_channel *kchan;
2011
2012 DBG("Listing channels for session %s", session->name);
2013
b551a063
DG
2014 switch (domain) {
2015 case LTTNG_DOMAIN_KERNEL:
2016 /* Kernel channels */
2017 if (session->kernel_session != NULL) {
2018 cds_list_for_each_entry(kchan,
2019 &session->kernel_session->channel_list.head, list) {
2020 /* Copy lttng_channel struct to array */
2021 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2022 channels[i].enabled = kchan->enabled;
2023 i++;
2024 }
2025 }
2026 break;
2027 case LTTNG_DOMAIN_UST:
2028 {
2029 struct cds_lfht_iter iter;
2030 struct ltt_ust_channel *uchan;
2031
2032 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2033 &iter, uchan, node) {
2034 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2035 channels[i].attr.overwrite = uchan->attr.overwrite;
2036 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2037 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2038 channels[i].attr.switch_timer_interval =
2039 uchan->attr.switch_timer_interval;
2040 channels[i].attr.read_timer_interval =
2041 uchan->attr.read_timer_interval;
aea829b3 2042 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2043 switch (uchan->attr.output) {
2044 case LTTNG_UST_MMAP:
2045 default:
2046 channels[i].attr.output = LTTNG_EVENT_MMAP;
2047 break;
2048 }
befe0905 2049 i++;
b551a063
DG
2050 }
2051 break;
2052 }
2053 default:
2054 break;
2055 }
2056}
2057
2058/*
2059 * Create a list of ust global domain events.
2060 */
2061static int list_lttng_ust_global_events(char *channel_name,
2062 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2063{
2064 int i = 0, ret = 0;
2065 unsigned int nb_event = 0;
2066 struct cds_lfht_iter iter;
d7b75b30 2067 struct cds_lfht_node *node;
b551a063
DG
2068 struct ltt_ust_channel *uchan;
2069 struct ltt_ust_event *uevent;
2070 struct lttng_event *tmp;
2071
2072 DBG("Listing UST global events for channel %s", channel_name);
2073
2074 rcu_read_lock();
2075
d7b75b30
DG
2076 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2077 strlen(channel_name), &iter);
2078 if (node == NULL) {
2079 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2080 goto error;
b551a063
DG
2081 }
2082
d7b75b30
DG
2083 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2084
2085 nb_event += hashtable_get_count(uchan->events);
2086
b551a063
DG
2087 if (nb_event == 0) {
2088 ret = nb_event;
2089 goto error;
2090 }
2091
2092 DBG3("Listing UST global %d events", nb_event);
2093
2094 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2095 if (tmp == NULL) {
2096 ret = -LTTCOMM_FATAL;
2097 goto error;
2098 }
2099
d7b75b30
DG
2100 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2101 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2102 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2103 tmp[i].enabled = uevent->enabled;
2104 switch (uevent->attr.instrumentation) {
2105 case LTTNG_UST_TRACEPOINT:
2106 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2107 break;
2108 case LTTNG_UST_PROBE:
2109 tmp[i].type = LTTNG_EVENT_PROBE;
2110 break;
2111 case LTTNG_UST_FUNCTION:
2112 tmp[i].type = LTTNG_EVENT_FUNCTION;
2113 break;
ac3bd9c0 2114 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2115 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2116 break;
9f19cc17 2117 }
d7b75b30 2118 i++;
9f19cc17
DG
2119 }
2120
b551a063
DG
2121 ret = nb_event;
2122 *events = tmp;
2123
2124error:
2125 rcu_read_unlock();
2126 return ret;
9f19cc17
DG
2127}
2128
2129/*
b551a063 2130 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2131 */
b551a063
DG
2132static int list_lttng_kernel_events(char *channel_name,
2133 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2134{
b551a063
DG
2135 int i = 0, ret;
2136 unsigned int nb_event;
9f19cc17 2137 struct ltt_kernel_event *event;
b551a063
DG
2138 struct ltt_kernel_channel *kchan;
2139
2140 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2141 if (kchan == NULL) {
2142 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2143 goto error;
2144 }
2145
2146 nb_event = kchan->event_count;
9f19cc17
DG
2147
2148 DBG("Listing events for channel %s", kchan->channel->name);
2149
b551a063
DG
2150 if (nb_event == 0) {
2151 ret = nb_event;
2152 goto error;
2153 }
2154
2155 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2156 if (*events == NULL) {
2157 ret = LTTCOMM_FATAL;
2158 goto error;
2159 }
2160
9f19cc17
DG
2161 /* Kernel channels */
2162 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2163 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2164 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2165 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2166 switch (event->event->instrumentation) {
2167 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2168 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2169 break;
2170 case LTTNG_KERNEL_KPROBE:
2171 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2172 (*events)[i].type = LTTNG_EVENT_PROBE;
2173 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2174 sizeof(struct lttng_kernel_kprobe));
2175 break;
2176 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2177 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2178 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2179 sizeof(struct lttng_kernel_function));
2180 break;
0133c199 2181 case LTTNG_KERNEL_NOOP:
b551a063 2182 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2183 break;
a54bd42d 2184 case LTTNG_KERNEL_SYSCALL:
b551a063 2185 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2186 break;
7a3d1328
MD
2187 case LTTNG_KERNEL_ALL:
2188 assert(0);
2189 break;
9f19cc17
DG
2190 }
2191 i++;
2192 }
b551a063
DG
2193
2194 return nb_event;
2195
2196error:
2197 return ret;
9f19cc17
DG
2198}
2199
fac6795d 2200/*
54d01ffb 2201 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2202 */
54d01ffb
DG
2203static int cmd_disable_channel(struct ltt_session *session,
2204 int domain, char *channel_name)
fac6795d 2205{
54d01ffb 2206 int ret;
78f0bacd
DG
2207 struct ltt_ust_session *usess;
2208
2209 usess = session->ust_session;
379473d2 2210
54d01ffb 2211 switch (domain) {
78f0bacd
DG
2212 case LTTNG_DOMAIN_KERNEL:
2213 {
2214 ret = channel_kernel_disable(session->kernel_session,
2215 channel_name);
2216 if (ret != LTTCOMM_OK) {
2217 goto error;
2218 }
54d01ffb 2219
78f0bacd
DG
2220 kernel_wait_quiescent(kernel_tracer_fd);
2221 break;
2222 }
2223 case LTTNG_DOMAIN_UST:
2224 {
2225 struct ltt_ust_channel *uchan;
7885e399 2226 struct cds_lfht *chan_ht;
78f0bacd 2227
7885e399
DG
2228 chan_ht = usess->domain_global.channels;
2229
2230 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2231 if (uchan == NULL) {
2232 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2233 goto error;
78f0bacd
DG
2234 }
2235
7885e399
DG
2236 ret = channel_ust_disable(usess, domain, uchan);
2237 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2238 goto error;
2239 }
78f0bacd
DG
2240 break;
2241 }
2242 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2243 case LTTNG_DOMAIN_UST_EXEC_NAME:
2244 case LTTNG_DOMAIN_UST_PID:
2245 ret = LTTCOMM_NOT_IMPLEMENTED;
2246 goto error;
2247 default:
2248 ret = LTTCOMM_UNKNOWN_DOMAIN;
2249 goto error;
20fe2104
DG
2250 }
2251
54d01ffb 2252 ret = LTTCOMM_OK;
d65106b1 2253
54d01ffb
DG
2254error:
2255 return ret;
2256}
2257
2258/*
2259 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2260 */
44d3bd01 2261static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2262 int domain, struct lttng_channel *attr)
54d01ffb
DG
2263{
2264 int ret;
f6a9efaa 2265 struct ltt_ust_session *usess = session->ust_session;
7885e399 2266 struct cds_lfht *chan_ht;
f6a9efaa 2267
5d56b5aa 2268 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2269
aea829b3 2270 switch (domain) {
44d3bd01
DG
2271 case LTTNG_DOMAIN_KERNEL:
2272 {
2273 struct ltt_kernel_channel *kchan;
54d01ffb 2274
44d3bd01
DG
2275 kchan = trace_kernel_get_channel_by_name(attr->name,
2276 session->kernel_session);
2277 if (kchan == NULL) {
2278 ret = channel_kernel_create(session->kernel_session,
2279 attr, kernel_poll_pipe[1]);
2280 } else {
2281 ret = channel_kernel_enable(session->kernel_session, kchan);
2282 }
2283
2284 if (ret != LTTCOMM_OK) {
2285 goto error;
2286 }
2287
2288 kernel_wait_quiescent(kernel_tracer_fd);
2289 break;
2290 }
f6a9efaa
DG
2291 case LTTNG_DOMAIN_UST:
2292 {
2293 struct ltt_ust_channel *uchan;
2294
7885e399 2295 chan_ht = usess->domain_global.channels;
f6a9efaa 2296
7885e399 2297 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2298 if (uchan == NULL) {
7885e399 2299 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2300 } else {
7885e399 2301 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2302 }
f6a9efaa
DG
2303 break;
2304 }
78f0bacd
DG
2305 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2306 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2307 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG
2308 ret = LTTCOMM_NOT_IMPLEMENTED;
2309 goto error;
44d3bd01
DG
2310 default:
2311 ret = LTTCOMM_UNKNOWN_DOMAIN;
2312 goto error;
54d01ffb
DG
2313 }
2314
54d01ffb
DG
2315error:
2316 return ret;
2317}
2318
2319/*
2320 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2321 */
2322static int cmd_disable_event(struct ltt_session *session, int domain,
2323 char *channel_name, char *event_name)
2324{
2325 int ret;
54d01ffb
DG
2326
2327 switch (domain) {
2328 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2329 {
2330 struct ltt_kernel_channel *kchan;
b0a40d28 2331 struct ltt_kernel_session *ksess;
2bdd86d4 2332
b0a40d28
DG
2333 ksess = session->kernel_session;
2334
2335 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2336 if (kchan == NULL) {
2337 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2338 goto error;
d65106b1
DG
2339 }
2340
b0a40d28 2341 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2342 if (ret != LTTCOMM_OK) {
2343 goto error;
2344 }
2345
2346 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2347 break;
2bdd86d4
MD
2348 }
2349 case LTTNG_DOMAIN_UST:
b0a40d28 2350 {
b0a40d28 2351 struct ltt_ust_channel *uchan;
7f79d3a1 2352 struct ltt_ust_session *usess;
b0a40d28
DG
2353
2354 usess = session->ust_session;
2355
2356 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2357 channel_name);
2358 if (uchan == NULL) {
2359 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2360 goto error;
2361 }
2362
7f79d3a1
DG
2363 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2364 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2365 goto error;
2366 }
2367
7f79d3a1 2368 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2369 channel_name);
b0a40d28
DG
2370 break;
2371 }
2bdd86d4
MD
2372 case LTTNG_DOMAIN_UST_EXEC_NAME:
2373 case LTTNG_DOMAIN_UST_PID:
2374 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2375 default:
54d01ffb
DG
2376 ret = LTTCOMM_NOT_IMPLEMENTED;
2377 goto error;
d65106b1 2378 }
26cc6b4e 2379
54d01ffb
DG
2380 ret = LTTCOMM_OK;
2381
2382error:
2383 return ret;
2384}
2385
2386/*
2387 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2388 */
2389static int cmd_disable_event_all(struct ltt_session *session, int domain,
2390 char *channel_name)
2391{
2392 int ret;
54d01ffb
DG
2393
2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2396 {
2397 struct ltt_kernel_session *ksess;
2398 struct ltt_kernel_channel *kchan;
2399
2400 ksess = session->kernel_session;
2401
2402 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2403 if (kchan == NULL) {
2404 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2405 goto error;
26cc6b4e
DG
2406 }
2407
9730260e 2408 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2409 if (ret != LTTCOMM_OK) {
0b97ec54 2410 goto error;
26cc6b4e
DG
2411 }
2412
54d01ffb 2413 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2414 break;
9730260e
DG
2415 }
2416 case LTTNG_DOMAIN_UST:
2417 {
2418 struct ltt_ust_session *usess;
2419 struct ltt_ust_channel *uchan;
2420
2421 usess = session->ust_session;
2422
2423 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2424 channel_name);
2425 if (uchan == NULL) {
2426 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2427 goto error;
2428 }
2429
7f79d3a1
DG
2430 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2431 if (ret != 0) {
9730260e
DG
2432 goto error;
2433 }
2434
7f79d3a1 2435 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2436
2437 break;
2438 }
2439 case LTTNG_DOMAIN_UST_EXEC_NAME:
2440 case LTTNG_DOMAIN_UST_PID:
2441 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2442 default:
54d01ffb
DG
2443 ret = LTTCOMM_NOT_IMPLEMENTED;
2444 goto error;
26cc6b4e 2445 }
e953ef25 2446
54d01ffb 2447 ret = LTTCOMM_OK;
e953ef25 2448
54d01ffb
DG
2449error:
2450 return ret;
2451}
f5177a38 2452
54d01ffb
DG
2453/*
2454 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2455 */
2456static int cmd_add_context(struct ltt_session *session, int domain,
2457 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2458{
2459 int ret;
f5177a38 2460
54d01ffb
DG
2461 switch (domain) {
2462 case LTTNG_DOMAIN_KERNEL:
2463 /* Add kernel context to kernel tracer */
2464 ret = context_kernel_add(session->kernel_session, ctx,
2465 event_name, channel_name);
2466 if (ret != LTTCOMM_OK) {
f5177a38 2467 goto error;
e953ef25 2468 }
2bdd86d4
MD
2469 break;
2470 case LTTNG_DOMAIN_UST:
2471 {
55cc08a6 2472 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2473
55cc08a6
DG
2474 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2475 if (ret != LTTCOMM_OK) {
2476 goto error;
2bdd86d4 2477 }
e953ef25 2478 break;
2bdd86d4 2479 }
55cc08a6
DG
2480 case LTTNG_DOMAIN_UST_EXEC_NAME:
2481 case LTTNG_DOMAIN_UST_PID:
2482 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2483 default:
54d01ffb
DG
2484 ret = LTTCOMM_NOT_IMPLEMENTED;
2485 goto error;
e953ef25 2486 }
950131af 2487
54d01ffb 2488 ret = LTTCOMM_OK;
950131af 2489
54d01ffb
DG
2490error:
2491 return ret;
2492}
2493
2494/*
2495 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD
2496 *
2497 * TODO: currently, both events and loglevels are kept within the same
2498 * namespace for UST global registry/app registery, so if an event
2499 * happen to have the same name as the loglevel (very unlikely though),
2500 * and an attempt is made to enable/disable both in the same session,
2501 * the first to be created will be the only one allowed to exist.
54d01ffb
DG
2502 */
2503static int cmd_enable_event(struct ltt_session *session, int domain,
2504 char *channel_name, struct lttng_event *event)
2505{
2506 int ret;
f6cd6b0f 2507 struct lttng_channel *attr;
48842b30 2508 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2509
2510 switch (domain) {
2511 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2512 {
2513 struct ltt_kernel_channel *kchan;
2514
54d01ffb
DG
2515 kchan = trace_kernel_get_channel_by_name(channel_name,
2516 session->kernel_session);
2517 if (kchan == NULL) {
f6cd6b0f
DG
2518 attr = channel_new_default_attr(domain);
2519 if (attr == NULL) {
2520 ret = LTTCOMM_FATAL;
2521 goto error;
2522 }
2523 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2524
54d01ffb 2525 /* This call will notify the kernel thread */
44d3bd01 2526 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2527 attr, kernel_poll_pipe[1]);
54d01ffb 2528 if (ret != LTTCOMM_OK) {
ff4d74e6 2529 free(attr);
f5177a38
DG
2530 goto error;
2531 }
ff4d74e6 2532 free(attr);
54d01ffb 2533 }
950131af 2534
54d01ffb
DG
2535 /* Get the newly created kernel channel pointer */
2536 kchan = trace_kernel_get_channel_by_name(channel_name,
2537 session->kernel_session);
2538 if (kchan == NULL) {
2539 /* This sould not happen... */
2540 ret = LTTCOMM_FATAL;
2541 goto error;
2542 }
f5177a38 2543
48842b30
DG
2544 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2545 event);
54d01ffb 2546 if (ret != LTTCOMM_OK) {
f5177a38 2547 goto error;
950131af
DG
2548 }
2549
54d01ffb 2550 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2551 break;
2bdd86d4
MD
2552 }
2553 case LTTNG_DOMAIN_UST:
2554 {
aea829b3 2555 struct lttng_channel *attr;
edb67388 2556 struct ltt_ust_channel *uchan;
2bdd86d4 2557
edb67388 2558 /* Get channel from global UST domain */
48842b30
DG
2559 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2560 channel_name);
2561 if (uchan == NULL) {
aea829b3
DG
2562 /* Create default channel */
2563 attr = channel_new_default_attr(domain);
2564 if (attr == NULL) {
2565 ret = LTTCOMM_FATAL;
2566 goto error;
2567 }
596219f7 2568 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2569 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2570
7885e399 2571 ret = channel_ust_create(usess, domain, attr);
edb67388 2572 if (ret != LTTCOMM_OK) {
ff4d74e6 2573 free(attr);
aea829b3
DG
2574 goto error;
2575 }
aea829b3
DG
2576 free(attr);
2577
2578 /* Get the newly created channel reference back */
2579 uchan = trace_ust_find_channel_by_name(
2580 usess->domain_global.channels, channel_name);
2581 if (uchan == NULL) {
2582 /* Something is really wrong */
2583 ret = LTTCOMM_FATAL;
2584 goto error;
2585 }
48842b30 2586 }
2bdd86d4 2587
edb67388 2588 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2589
edb67388
DG
2590 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2591 if (ret != LTTCOMM_OK) {
48842b30 2592 goto error;
2bdd86d4
MD
2593 }
2594 break;
2595 }
2596 case LTTNG_DOMAIN_UST_EXEC_NAME:
2597 case LTTNG_DOMAIN_UST_PID:
2598 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2599 default:
54d01ffb
DG
2600 ret = LTTCOMM_NOT_IMPLEMENTED;
2601 goto error;
950131af 2602 }
d36b8583 2603
54d01ffb 2604 ret = LTTCOMM_OK;
d36b8583 2605
54d01ffb
DG
2606error:
2607 return ret;
2608}
7d29a247 2609
54d01ffb
DG
2610/*
2611 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2612 */
2613static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2614 char *channel_name, int event_type)
54d01ffb
DG
2615{
2616 int ret;
2617 struct ltt_kernel_channel *kchan;
7d29a247 2618
54d01ffb
DG
2619 switch (domain) {
2620 case LTTNG_DOMAIN_KERNEL:
2621 kchan = trace_kernel_get_channel_by_name(channel_name,
2622 session->kernel_session);
2623 if (kchan == NULL) {
2624 /* This call will notify the kernel thread */
44d3bd01
DG
2625 ret = channel_kernel_create(session->kernel_session, NULL,
2626 kernel_poll_pipe[1]);
54d01ffb
DG
2627 if (ret != LTTCOMM_OK) {
2628 goto error;
d36b8583 2629 }
0d0c377a 2630
8f69e5eb
DG
2631 /* Get the newly created kernel channel pointer */
2632 kchan = trace_kernel_get_channel_by_name(channel_name,
2633 session->kernel_session);
2634 if (kchan == NULL) {
2635 /* This sould not happen... */
2636 ret = LTTCOMM_FATAL;
2637 goto error;
2638 }
2639
54d01ffb 2640 }
0fdd1e2c 2641
7a3d1328 2642 switch (event_type) {
76d45b40 2643 case LTTNG_EVENT_SYSCALL:
7a3d1328 2644 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2645 kchan, kernel_tracer_fd);
7a3d1328 2646 break;
76d45b40 2647 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2648 /*
7a3d1328
MD
2649 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2650 * events already registered to the channel.
8c9ae521 2651 */
7a3d1328
MD
2652 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2653 kchan, kernel_tracer_fd);
2654 break;
76d45b40 2655 case LTTNG_EVENT_ALL:
7a3d1328 2656 /* Enable syscalls and tracepoints */
8c9ae521
DG
2657 ret = event_kernel_enable_all(session->kernel_session,
2658 kchan, kernel_tracer_fd);
7a3d1328
MD
2659 break;
2660 default:
2661 ret = LTTCOMM_KERN_ENABLE_FAIL;
2662 goto error;
8c9ae521 2663 }
8f69e5eb
DG
2664
2665 /* Manage return value */
54d01ffb 2666 if (ret != LTTCOMM_OK) {
0d0c377a 2667 goto error;
d36b8583
DG
2668 }
2669
54d01ffb 2670 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2671 break;
76d45b40
DG
2672 case LTTNG_DOMAIN_UST:
2673 {
2674 struct lttng_channel *attr;
2675 struct ltt_ust_channel *uchan;
2676 struct ltt_ust_session *usess = session->ust_session;
2677
2678 /* Get channel from global UST domain */
2679 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2680 channel_name);
2681 if (uchan == NULL) {
2682 /* Create default channel */
2683 attr = channel_new_default_attr(domain);
2684 if (attr == NULL) {
2685 ret = LTTCOMM_FATAL;
2686 goto error;
2687 }
2688 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2689 attr->name[NAME_MAX - 1] = '\0';
2690
2691 /* Use the internal command enable channel */
7885e399 2692 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2693 if (ret != LTTCOMM_OK) {
2694 free(attr);
2695 goto error;
2696 }
2697 free(attr);
2698
2699 /* Get the newly created channel reference back */
2700 uchan = trace_ust_find_channel_by_name(
2701 usess->domain_global.channels, channel_name);
2702 if (uchan == NULL) {
2703 /* Something is really wrong */
2704 ret = LTTCOMM_FATAL;
2705 goto error;
2706 }
2707 }
2708
2709 /* At this point, the session and channel exist on the tracer */
2710
2711 switch (event_type) {
2712 case LTTNG_EVENT_ALL:
2713 case LTTNG_EVENT_TRACEPOINT:
2714 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2715 if (ret != LTTCOMM_OK) {
2716 goto error;
2717 }
2718 break;
2719 default:
2720 ret = LTTCOMM_UST_ENABLE_FAIL;
2721 goto error;
2722 }
2723
2724 /* Manage return value */
2725 if (ret != LTTCOMM_OK) {
2726 goto error;
2727 }
2728
2729 break;
2730 }
2731 case LTTNG_DOMAIN_UST_EXEC_NAME:
2732 case LTTNG_DOMAIN_UST_PID:
2733 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2734 default:
54d01ffb
DG
2735 ret = LTTCOMM_NOT_IMPLEMENTED;
2736 goto error;
d36b8583 2737 }
f3ed775e 2738
54d01ffb
DG
2739 ret = LTTCOMM_OK;
2740
2741error:
2742 return ret;
2743}
2744
2745/*
2746 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2747 */
2748static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2749{
2750 int ret;
2751 ssize_t nb_events = 0;
2752
2753 switch (domain) {
2754 case LTTNG_DOMAIN_KERNEL:
2755 nb_events = kernel_list_events(kernel_tracer_fd, events);
2756 if (nb_events < 0) {
2757 ret = LTTCOMM_KERN_LIST_FAIL;
2758 goto error;
894be886 2759 }
54d01ffb 2760 break;
b551a063
DG
2761 case LTTNG_DOMAIN_UST:
2762 nb_events = ust_app_list_events(events);
2763 if (nb_events < 0) {
2764 ret = LTTCOMM_UST_LIST_FAIL;
2765 goto error;
2766 }
2767 break;
54d01ffb 2768 default:
54d01ffb
DG
2769 ret = LTTCOMM_NOT_IMPLEMENTED;
2770 goto error;
2771 }
894be886 2772
54d01ffb 2773 return nb_events;
7d29a247 2774
54d01ffb
DG
2775error:
2776 /* Return negative value to differentiate return code */
2777 return -ret;
2778}
b389abbe 2779
54d01ffb
DG
2780/*
2781 * Command LTTNG_START_TRACE processed by the client thread.
2782 */
2783static int cmd_start_trace(struct ltt_session *session)
2784{
2785 int ret;
54d01ffb 2786 struct ltt_kernel_session *ksession;
b9d9b220 2787 struct ltt_ust_session *usess;
b389abbe 2788
54d01ffb
DG
2789 /* Short cut */
2790 ksession = session->kernel_session;
b9d9b220 2791 usess = session->ust_session;
5eb91c98 2792
b9ef1c83
DG
2793 if (session->enabled) {
2794 ret = LTTCOMM_UST_START_FAIL;
2795 goto error;
2796 }
2797
464dd62d
MD
2798 session->enabled = 1;
2799
54d01ffb
DG
2800 /* Kernel tracing */
2801 if (ksession != NULL) {
2bdd86d4
MD
2802 struct ltt_kernel_channel *kchan;
2803
54d01ffb
DG
2804 /* Open kernel metadata */
2805 if (ksession->metadata == NULL) {
2806 ret = kernel_open_metadata(ksession, ksession->trace_path);
2807 if (ret < 0) {
2808 ret = LTTCOMM_KERN_META_FAIL;
2809 goto error;
b389abbe 2810 }
54d01ffb 2811 }
7d29a247 2812
54d01ffb
DG
2813 /* Open kernel metadata stream */
2814 if (ksession->metadata_stream_fd == 0) {
2815 ret = kernel_open_metadata_stream(ksession);
2816 if (ret < 0) {
2817 ERR("Kernel create metadata stream failed");
2818 ret = LTTCOMM_KERN_STREAM_FAIL;
2819 goto error;
2820 }
2821 }
2822
2823 /* For each channel */
2824 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2825 if (kchan->stream_count == 0) {
2826 ret = kernel_open_channel_stream(kchan);
2827 if (ret < 0) {
2828 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2829 goto error;
2830 }
54d01ffb
DG
2831 /* Update the stream global counter */
2832 ksession->stream_count_global += ret;
7d29a247 2833 }
54d01ffb
DG
2834 }
2835
2836 /* Setup kernel consumer socket and send fds to it */
2837 ret = init_kernel_tracing(ksession);
2838 if (ret < 0) {
2839 ret = LTTCOMM_KERN_START_FAIL;
2840 goto error;
2841 }
2842
2843 /* This start the kernel tracing */
2844 ret = kernel_start_session(ksession);
2845 if (ret < 0) {
2846 ret = LTTCOMM_KERN_START_FAIL;
2847 goto error;
2848 }
2849
2850 /* Quiescent wait after starting trace */
2851 kernel_wait_quiescent(kernel_tracer_fd);
2852 }
2853
36dc12cc 2854 /* Flag session that trace should start automatically */
b9d9b220
DG
2855 if (usess) {
2856 usess->start_trace = 1;
36dc12cc 2857
b9d9b220
DG
2858 ret = ust_app_start_trace_all(usess);
2859 if (ret < 0) {
2860 ret = LTTCOMM_UST_START_FAIL;
2861 goto error;
2862 }
2bdd86d4 2863 }
54d01ffb
DG
2864
2865 ret = LTTCOMM_OK;
2866
2867error:
2868 return ret;
2869}
2870
2871/*
2872 * Command LTTNG_STOP_TRACE processed by the client thread.
2873 */
2874static int cmd_stop_trace(struct ltt_session *session)
2875{
2876 int ret;
2877 struct ltt_kernel_channel *kchan;
2878 struct ltt_kernel_session *ksession;
8be98f9a 2879 struct ltt_ust_session *usess;
54d01ffb
DG
2880
2881 /* Short cut */
2882 ksession = session->kernel_session;
8be98f9a 2883 usess = session->ust_session;
54d01ffb 2884
b9ef1c83
DG
2885 if (!session->enabled) {
2886 ret = LTTCOMM_UST_START_FAIL;
2887 goto error;
2888 }
2889
464dd62d
MD
2890 session->enabled = 0;
2891
54d01ffb
DG
2892 /* Kernel tracer */
2893 if (ksession != NULL) {
2894 DBG("Stop kernel tracing");
2895
2896 /* Flush all buffers before stopping */
2897 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2898 if (ret < 0) {
2899 ERR("Kernel metadata flush failed");
2900 }
f34daff7 2901
54d01ffb
DG
2902 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2903 ret = kernel_flush_buffer(kchan);
0d0c377a 2904 if (ret < 0) {
54d01ffb 2905 ERR("Kernel flush buffer error");
7d29a247 2906 }
54d01ffb 2907 }
19e70852 2908
54d01ffb
DG
2909 ret = kernel_stop_session(ksession);
2910 if (ret < 0) {
2911 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2912 goto error;
f3ed775e 2913 }
54d01ffb
DG
2914
2915 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2916 }
54d01ffb 2917
8be98f9a
MD
2918 if (usess) {
2919 usess->start_trace = 0;
2bdd86d4 2920
8be98f9a 2921 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2922 if (ret < 0) {
8be98f9a 2923 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2924 goto error;
2925 }
2bdd86d4 2926 }
54d01ffb
DG
2927
2928 ret = LTTCOMM_OK;
2929
2930error:
2931 return ret;
2932}
2933
2934/*
2935 * Command LTTNG_CREATE_SESSION processed by the client thread.
2936 */
2937static int cmd_create_session(char *name, char *path)
2938{
2939 int ret;
2940
2941 ret = session_create(name, path);
2942 if (ret != LTTCOMM_OK) {
2943 goto error;
2944 }
2945
2946 ret = LTTCOMM_OK;
2947
2948error:
2949 return ret;
2950}
2951
2952/*
2953 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2954 */
2955static int cmd_destroy_session(struct ltt_session *session, char *name)
2956{
2957 int ret;
2958
2959 /* Clean kernel session teardown */
2960 teardown_kernel_session(session);
84cd17c6
MD
2961 /* UST session teardown */
2962 teardown_ust_session(session);
54d01ffb
DG
2963
2964 /*
2965 * Must notify the kernel thread here to update it's poll setin order
2966 * to remove the channel(s)' fd just destroyed.
2967 */
2968 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2969 if (ret < 0) {
2970 perror("write kernel poll pipe");
2971 }
2972
271933a4 2973 ret = session_destroy(session);
54d01ffb
DG
2974
2975 return ret;
2976}
2977
2978/*
2979 * Command LTTNG_CALIBRATE processed by the client thread.
2980 */
2981static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2982{
2983 int ret;
2984
2985 switch (domain) {
2986 case LTTNG_DOMAIN_KERNEL:
33a2b854 2987 {
54d01ffb 2988 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2989
54d01ffb
DG
2990 kcalibrate.type = calibrate->type;
2991 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2992 if (ret < 0) {
54d01ffb
DG
2993 ret = LTTCOMM_KERN_ENABLE_FAIL;
2994 goto error;
33a2b854 2995 }
54d01ffb
DG
2996 break;
2997 }
2998 default:
2999 /* TODO: Userspace tracing */
3000 ret = LTTCOMM_NOT_IMPLEMENTED;
3001 goto error;
3002 }
33a2b854 3003
54d01ffb 3004 ret = LTTCOMM_OK;
33a2b854 3005
54d01ffb
DG
3006error:
3007 return ret;
3008}
7d29a247 3009
54d01ffb
DG
3010/*
3011 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3012 */
3013static int cmd_register_consumer(struct ltt_session *session, int domain,
3014 char *sock_path)
3015{
3016 int ret, sock;
b389abbe 3017
54d01ffb
DG
3018 switch (domain) {
3019 case LTTNG_DOMAIN_KERNEL:
3020 /* Can't register a consumer if there is already one */
48c4f28c 3021 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3022 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3023 goto error;
3024 }
3025
3026 sock = lttcomm_connect_unix_sock(sock_path);
3027 if (sock < 0) {
3028 ret = LTTCOMM_CONNECT_FAIL;
3029 goto error;
3030 }
3031
3032 session->kernel_session->consumer_fd = sock;
3033 break;
3034 default:
3035 /* TODO: Userspace tracing */
3036 ret = LTTCOMM_NOT_IMPLEMENTED;
3037 goto error;
3038 }
3039
3040 ret = LTTCOMM_OK;
3041
3042error:
3043 return ret;
3044}
3045
3046/*
3047 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3048 */
3049static ssize_t cmd_list_domains(struct ltt_session *session,
3050 struct lttng_domain **domains)
3051{
b551a063 3052 int ret, index = 0;
54d01ffb
DG
3053 ssize_t nb_dom = 0;
3054
3055 if (session->kernel_session != NULL) {
b551a063 3056 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3057 nb_dom++;
3058 }
3059
b551a063
DG
3060 if (session->ust_session != NULL) {
3061 DBG3("Listing domains found UST global domain");
3062 nb_dom++;
3063 }
54d01ffb 3064
b551a063 3065 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3066 if (*domains == NULL) {
3067 ret = -LTTCOMM_FATAL;
3068 goto error;
3069 }
3070
b551a063
DG
3071 if (session->kernel_session != NULL) {
3072 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3073 index++;
3074 }
3075
3076 if (session->ust_session != NULL) {
3077 (*domains)[index].type = LTTNG_DOMAIN_UST;
3078 index++;
3079 }
54d01ffb 3080
54d01ffb
DG
3081 return nb_dom;
3082
3083error:
3084 return ret;
3085}
3086
3087/*
3088 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3089 */
b551a063 3090static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3091 struct lttng_channel **channels)
3092{
3093 int ret;
3094 ssize_t nb_chan = 0;
3095
b551a063
DG
3096 switch (domain) {
3097 case LTTNG_DOMAIN_KERNEL:
3098 if (session->kernel_session != NULL) {
3099 nb_chan = session->kernel_session->channel_count;
3100 }
0df502fd 3101 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3102 break;
3103 case LTTNG_DOMAIN_UST:
3104 if (session->ust_session != NULL) {
3105 nb_chan = hashtable_get_count(
3106 session->ust_session->domain_global.channels);
3107 }
0df502fd 3108 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3109 break;
3110 default:
3111 *channels = NULL;
3112 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3113 goto error;
3114 }
3115
b551a063
DG
3116 if (nb_chan > 0) {
3117 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3118 if (*channels == NULL) {
3119 ret = -LTTCOMM_FATAL;
3120 goto error;
3121 }
54d01ffb 3122
b551a063
DG
3123 list_lttng_channels(domain, session, *channels);
3124 } else {
3125 *channels = NULL;
3126 }
2bdd86d4 3127
54d01ffb
DG
3128 return nb_chan;
3129
3130error:
3131 return ret;
3132}
3133
3134/*
3135 * Command LTTNG_LIST_EVENTS processed by the client thread.
3136 */
b551a063 3137static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3138 char *channel_name, struct lttng_event **events)
3139{
b551a063 3140 int ret = 0;
54d01ffb 3141 ssize_t nb_event = 0;
54d01ffb 3142
b551a063
DG
3143 switch (domain) {
3144 case LTTNG_DOMAIN_KERNEL:
3145 if (session->kernel_session != NULL) {
3146 nb_event = list_lttng_kernel_events(channel_name,
3147 session->kernel_session, events);
54d01ffb 3148 }
b551a063
DG
3149 break;
3150 case LTTNG_DOMAIN_UST:
3151 {
3152 if (session->ust_session != NULL) {
3153 nb_event = list_lttng_ust_global_events(channel_name,
3154 &session->ust_session->domain_global, events);
3155 }
3156 break;
54d01ffb 3157 }
b551a063
DG
3158 default:
3159 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3160 goto error;
3161 }
3162
b551a063 3163 ret = nb_event;
54d01ffb
DG
3164
3165error:
3166 return ret;
3167}
3168
3169/*
3170 * Process the command requested by the lttng client within the command
3171 * context structure. This function make sure that the return structure (llm)
3172 * is set and ready for transmission before returning.
3173 *
3174 * Return any error encountered or 0 for success.
3175 */
3176static int process_client_msg(struct command_ctx *cmd_ctx)
3177{
3178 int ret = LTTCOMM_OK;
44d3bd01 3179 int need_tracing_session = 1;
54d01ffb
DG
3180
3181 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3182
4fba7219
DG
3183 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3184 ret = LTTCOMM_KERN_NA;
3185 goto error;
3186 }
3187
54d01ffb
DG
3188 /*
3189 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3190 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3191 * command.
3192 */
3193 switch(cmd_ctx->lsm->cmd_type) {
3194 case LTTNG_LIST_SESSIONS:
3195 case LTTNG_LIST_TRACEPOINTS:
3196 case LTTNG_LIST_DOMAINS:
3197 case LTTNG_LIST_CHANNELS:
3198 case LTTNG_LIST_EVENTS:
3199 break;
3200 default:
3201 /* Setup lttng message with no payload */
3202 ret = setup_lttng_msg(cmd_ctx, 0);
3203 if (ret < 0) {
3204 /* This label does not try to unlock the session */
3205 goto init_setup_error;
3206 }
3207 }
3208
3209 /* Commands that DO NOT need a session. */
3210 switch (cmd_ctx->lsm->cmd_type) {
3211 case LTTNG_CALIBRATE:
3212 case LTTNG_CREATE_SESSION:
3213 case LTTNG_LIST_SESSIONS:
3214 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3215 need_tracing_session = 0;
54d01ffb
DG
3216 break;
3217 default:
3218 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3219 session_lock_list();
54d01ffb 3220 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3221 session_unlock_list();
54d01ffb
DG
3222 if (cmd_ctx->session == NULL) {
3223 if (cmd_ctx->lsm->session.name != NULL) {
3224 ret = LTTCOMM_SESS_NOT_FOUND;
3225 } else {
3226 /* If no session name specified */
3227 ret = LTTCOMM_SELECT_SESS;
3228 }
3229 goto error;
3230 } else {
3231 /* Acquire lock for the session */
3232 session_lock(cmd_ctx->session);
3233 }
3234 break;
3235 }
b389abbe 3236
54d01ffb
DG
3237 /*
3238 * Check domain type for specific "pre-action".
3239 */
3240 switch (cmd_ctx->lsm->domain.type) {
3241 case LTTNG_DOMAIN_KERNEL:
3242 /* Kernel tracer check */
3243 if (kernel_tracer_fd == 0) {
3244 /* Basically, load kernel tracer modules */
3245 init_kernel_tracer();
3246 if (kernel_tracer_fd == 0) {
3247 ret = LTTCOMM_KERN_NA;
3248 goto error;
3249 }
3250 }
5eb91c98 3251
54d01ffb 3252 /* Need a session for kernel command */
44d3bd01 3253 if (need_tracing_session) {
54d01ffb 3254 if (cmd_ctx->session->kernel_session == NULL) {
be040666 3255 ret = create_kernel_session(cmd_ctx->session, &cmd_ctx->creds);
5eb91c98 3256 if (ret < 0) {
54d01ffb 3257 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3258 goto error;
3259 }
b389abbe 3260 }
7d29a247 3261
54d01ffb 3262 /* Start the kernel consumer daemon */
3bd1e081
MD
3263 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3264 if (kconsumer_data.pid == 0 &&
54d01ffb 3265 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3266 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3267 ret = start_consumerd(&kconsumer_data);
7d29a247 3268 if (ret < 0) {
54d01ffb
DG
3269 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3270 goto error;
950131af 3271 }
3ff2ecac
MD
3272 } else {
3273 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3274 }
0d0c377a 3275 }
54d01ffb 3276 break;
2bdd86d4 3277 case LTTNG_DOMAIN_UST:
44d3bd01 3278 {
44d3bd01 3279 if (need_tracing_session) {
f6a9efaa 3280 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3281 ret = create_ust_session(cmd_ctx->session,
be040666 3282 &cmd_ctx->lsm->domain, &cmd_ctx->creds);
44d3bd01
DG
3283 if (ret != LTTCOMM_OK) {
3284 goto error;
3285 }
3286 }
7753dea8
MD
3287 /* Start the UST consumer daemons */
3288 /* 64-bit */
3289 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3290 if (consumerd64_bin[0] != '\0' &&
7753dea8 3291 ustconsumer64_data.pid == 0 &&
2bdd86d4 3292 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3293 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3294 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3295 if (ret < 0) {
7753dea8
MD
3296 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3297 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3298 goto error;
3299 }
48842b30 3300
7753dea8 3301 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3302 } else {
7753dea8
MD
3303 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3304 }
3305 /* 32-bit */
fc7a59ce 3306 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD
3307 ustconsumer32_data.pid == 0 &&
3308 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3309 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3310 ret = start_consumerd(&ustconsumer32_data);
3311 if (ret < 0) {
3312 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3313 ust_consumerd32_fd = -EINVAL;
3314 goto error;
3315 }
3316 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3317 } else {
3318 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3319 }
44d3bd01
DG
3320 }
3321 break;
48842b30 3322 }
54d01ffb 3323 default:
54d01ffb
DG
3324 break;
3325 }
33a2b854 3326
54d01ffb
DG
3327 /* Process by command type */
3328 switch (cmd_ctx->lsm->cmd_type) {
3329 case LTTNG_ADD_CONTEXT:
3330 {
3331 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3332 cmd_ctx->lsm->u.context.channel_name,
3333 cmd_ctx->lsm->u.context.event_name,
3334 &cmd_ctx->lsm->u.context.ctx);
3335 break;
3336 }
3337 case LTTNG_DISABLE_CHANNEL:
3338 {
3339 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3340 cmd_ctx->lsm->u.disable.channel_name);
3341 break;
3342 }