Prefer using the native consumer over 32-bit consumer for kernel
[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
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DG
91const char *progname;
92const char *opt_tracing_group;
5b8719f5 93static int opt_sig_parent;
fac6795d
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94static int opt_daemon;
95static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 96static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
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MD
101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG
117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG
125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG
130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG
136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG
150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG
159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD
171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fc7a59ce
AM
174static const char *consumerd32_bin =
175 __stringify(CONFIG_CONSUMERD32_BIN);
176static const char *consumerd64_bin =
177 __stringify(CONFIG_CONSUMERD64_BIN);
ebaeda94
MD
178static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD
182
183static
7753dea8 184void setup_consumerd_path(void)
fb09408a 185{
fc7a59ce 186 const char *bin, *libdir;
fb09408a 187
7753dea8
MD
188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
7753dea8 192 */
ebaeda94 193#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
194 if (!consumerd32_bin[0]) {
195 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
201 if (!consumerd64_bin[0]) {
202 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 203 }
ebaeda94
MD
204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
206 }
207#else
208#error "Unknown bitness"
209#endif
210
fb09408a
MD
211 /*
212 * runtime env. var. overrides the build default.
213 */
fc7a59ce
AM
214 bin = getenv("LTTNG_CONSUMERD32_BIN");
215 if (bin) {
216 consumerd32_bin = bin;
7753dea8 217 }
fc7a59ce
AM
218 bin = getenv("LTTNG_CONSUMERD64_BIN");
219 if (bin) {
220 consumerd64_bin = bin;
ebaeda94
MD
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
fb09408a
MD
229 }
230}
231
5eb91c98
DG
232/*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237{
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258error:
259 return ret;
260}
261
262/*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267static int check_thread_quit_pipe(int fd, uint32_t events)
268{
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274}
275
0fdd1e2c
DG
276/*
277 * Remove modules in reverse load order.
278 */
279static int modprobe_remove_kernel_modules(void)
280{
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 286 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
287 kernel_modules_list[i].name);
288 if (ret < 0) {
24b487b8 289 perror("snprintf modprobe -r");
0fdd1e2c
DG
290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
24b487b8 295 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307error:
308 return ret;
309}
310
311/*
312 * Return group ID of the tracing group or -1 if not found.
313 */
996b65c8
MD
314static gid_t allowed_group(void)
315{
316 struct group *grp;
317
274e143b
MD
318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
996b65c8
MD
323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328}
329
273ea72c 330/*
5eb91c98 331 * Init thread quit pipe.
273ea72c
DG
332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335static int init_thread_quit_pipe(void)
336{
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345error:
346 return ret;
347}
348
fac6795d 349/*
d063d709
DG
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
fac6795d 352 */
1d4b027a 353static void teardown_kernel_session(struct ltt_session *session)
fac6795d 354{
8f7a84dd
DG
355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
84ea9c99 357 return;
8f7a84dd
DG
358 }
359
84ea9c99 360 DBG("Tearing down kernel session");
d9800920 361
84ea9c99
MD
362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 368 }
84ea9c99
MD
369
370 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
371}
372
f6a9efaa
DG
373/*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377static void teardown_ust_session(struct ltt_session *session)
378{
84cd17c6
MD
379 int ret;
380
8f7a84dd
DG
381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
f470a390 383 return;
8f7a84dd
DG
384 }
385
84ea9c99 386 DBG("Tearing down UST session(s)");
8f7a84dd 387
84cd17c6
MD
388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
8f7a84dd 392
f6a9efaa
DG
393 trace_ust_destroy_session(session->ust_session);
394}
395
099e26bd
DG
396/*
397 * Stop all threads by closing the thread quit pipe.
398 */
cf3af59e
MD
399static void stop_threads(void)
400{
5eb91c98
DG
401 int ret;
402
cf3af59e
MD
403 /* Stopping all threads */
404 DBG("Terminating all threads");
54d01ffb 405 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
099e26bd
DG
410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
413}
414
fac6795d 415/*
d063d709 416 * Cleanup the daemon
fac6795d 417 */
cf3af59e 418static void cleanup(void)
fac6795d 419{
1d4b027a
DG
420 int ret;
421 char *cmd;
af9737e9 422 struct ltt_session *sess, *stmp;
fac6795d 423
1d4b027a 424 DBG("Cleaning up");
e07ae692 425
5eb91c98
DG
426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
5461b305 432
5eb91c98
DG
433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
1d4b027a 438 }
5461b305 439
1d4b027a 440 DBG("Cleaning up all session");
fac6795d 441
b5541356 442 /* Destroy session list mutex */
273ea72c
DG
443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
54d01ffb
DG
447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
273ea72c 449 teardown_kernel_session(sess);
f6a9efaa
DG
450 teardown_ust_session(sess);
451 free(sess);
273ea72c
DG
452 }
453 }
454
099e26bd 455 DBG("Closing all UST sockets");
56fff090 456 ust_app_clean_list();
099e26bd 457
3bd1e081 458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 459
f3ed775e 460 DBG("Closing kernel fd");
1d4b027a 461 close(kernel_tracer_fd);
ab147185 462
2f50c8a3
DG
463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
5eb91c98
DG
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
421cb601
DG
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
fac6795d
DG
476}
477
e065084a 478/*
d063d709 479 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 480 *
d063d709 481 * Return lttcomm error code.
e065084a
DG
482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
5461b305 493/*
d063d709 494 * Free memory of a command context structure.
5461b305 495 */
a2fb29a5 496static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 497{
a2fb29a5
DG
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
5461b305 502 }
a2fb29a5
DG
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
5461b305 505 }
a2fb29a5
DG
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
5461b305
DG
508 }
509}
510
f3ed775e 511/*
d063d709 512 * Send all stream fds of kernel channel to the consumer.
f3ed775e 513 */
2bdd86d4 514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 515 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
516{
517 int ret;
f3ed775e 518 struct ltt_kernel_stream *stream;
3bd1e081 519 struct lttcomm_consumer_msg lkm;
f3ed775e 520
3bd1e081 521 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 522 channel->channel->name);
f3ed775e 523
3bd1e081
MD
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 531 if (ret < 0) {
3bd1e081 532 perror("send consumer channel");
f3ed775e
DG
533 goto error;
534 }
535
3bd1e081 536 /* Send streams */
7a485870 537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
f3ed775e
DG
559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG
563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG
575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG
580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 617 if (ret < 0) {
3bd1e081 618 perror("send consumer stream");
7a485870
DG
619 goto error;
620 }
621 }
f3ed775e 622
f3ed775e 623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
fac6795d 638/*
0fdd1e2c 639 * Notify UST applications using the shm mmap futex.
fac6795d 640 */
0fdd1e2c 641static int notify_ust_apps(int active)
fac6795d 642{
0fdd1e2c 643 char *wait_shm_mmap;
fac6795d 644
0fdd1e2c 645 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 646
0fdd1e2c
DG
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
fac6795d
DG
650 goto error;
651 }
652
0fdd1e2c
DG
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
fac6795d
DG
658
659error:
0fdd1e2c 660 return -1;
fac6795d
DG
661}
662
e065084a 663/*
d063d709
DG
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
ca95a216 667 *
d063d709 668 * Return total size of the buffer pointed by buf.
ca95a216 669 */
5461b305 670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 671{
f3ed775e 672 int ret, buf_size;
ca95a216 673
f3ed775e 674 buf_size = size;
5461b305 675
ba7f0ae5 676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 677 if (cmd_ctx->llm == NULL) {
ba7f0ae5 678 perror("zmalloc");
5461b305 679 ret = -ENOMEM;
ca95a216
DG
680 goto error;
681 }
682
5461b305
DG
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 686
5461b305
DG
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
ca95a216
DG
690 return buf_size;
691
692error:
693 return ret;
694}
695
7a485870 696/*
5eb91c98 697 * Update the kernel poll set of all channel fd available over all tracing
d063d709 698 * session. Add the wakeup pipe at the end of the set.
7a485870 699 */
5eb91c98 700static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 701{
5eb91c98 702 int ret;
7a485870
DG
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
5eb91c98 706 DBG("Updating kernel poll set");
7a485870 707
54d01ffb 708 session_lock_list();
b5541356 709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 710 session_lock(session);
7a485870 711 if (session->kernel_session == NULL) {
54d01ffb 712 session_unlock(session);
7a485870
DG
713 continue;
714 }
7a485870 715
54d01ffb
DG
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
54d01ffb 721 session_unlock(session);
5eb91c98
DG
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 725 }
54d01ffb 726 session_unlock(session);
7a485870 727 }
54d01ffb 728 session_unlock_list();
7a485870 729
5eb91c98 730 return 0;
7a485870
DG
731
732error:
54d01ffb 733 session_unlock_list();
7a485870
DG
734 return -1;
735}
736
737/*
54d01ffb 738 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 739 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 740 *
d063d709 741 * Useful for CPU hotplug feature.
7a485870 742 */
2bdd86d4 743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
54d01ffb 751 session_lock_list();
b5541356 752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 753 session_lock(session);
7a485870 754 if (session->kernel_session == NULL) {
54d01ffb 755 session_unlock(session);
7a485870
DG
756 continue;
757 }
d9800920
DG
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
762 }
763
5eb91c98
DG
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
7a485870
DG
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
b3c750d2 770 goto error;
7a485870 771 }
d9800920 772
7a485870 773 /*
5eb91c98
DG
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
7a485870 777 */
3bd1e081 778 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 779 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 780 session->kernel_session->consumer_fd, channel);
7a485870 781 if (ret < 0) {
b3c750d2 782 goto error;
7a485870
DG
783 }
784 }
b3c750d2 785 goto error;
7a485870
DG
786 }
787 }
54d01ffb 788 session_unlock(session);
7a485870 789 }
54d01ffb 790 session_unlock_list();
b3c750d2 791 return ret;
7a485870 792
b3c750d2 793error:
54d01ffb
DG
794 session_unlock(session);
795 session_unlock_list();
7a485870
DG
796 return ret;
797}
798
487cf67c
DG
799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
487cf67c
DG
811 }
812}
813
7a485870 814/*
d063d709 815 * This thread manage event coming from the kernel.
7a485870 816 *
d063d709
DG
817 * Features supported in this thread:
818 * -) CPU Hotplug
7a485870
DG
819 */
820static void *thread_manage_kernel(void *data)
821{
5eb91c98
DG
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
7a485870 824 char tmp;
5eb91c98 825 struct lttng_poll_event events;
7a485870
DG
826
827 DBG("Thread manage kernel started");
828
5eb91c98
DG
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
7a485870
DG
839 while (1) {
840 if (update_poll_flag == 1) {
5f822d0a
DG
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
5eb91c98
DG
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
7a485870
DG
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
5eb91c98
DG
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
7a485870
DG
860
861 /* Poll infinite value of time */
5eb91c98 862 ret = lttng_poll_wait(&events, -1);
7a485870 863 if (ret < 0) {
7a485870
DG
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
85611738
DG
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
7a485870
DG
869 continue;
870 }
871
5eb91c98
DG
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 876
5eb91c98
DG
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
7a485870 882
5eb91c98
DG
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
2bdd86d4 894 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
7a485870 903 }
7a485870
DG
904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
273ea72c
DG
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
5eb91c98
DG
912
913 lttng_poll_clean(&events);
914
7a485870
DG
915 return NULL;
916}
917
1d4b027a 918/*
3bd1e081 919 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 920 */
3bd1e081 921static void *thread_manage_consumer(void *data)
1d4b027a 922{
5eb91c98
DG
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
1d4b027a 925 enum lttcomm_return_code code;
5eb91c98 926 struct lttng_poll_event events;
3bd1e081 927 struct consumer_data *consumer_data = data;
1d4b027a 928
3bd1e081 929 DBG("[thread] Manage consumer started");
1d4b027a 930
3bd1e081 931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
932 if (ret < 0) {
933 goto error;
934 }
935
5eb91c98
DG
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
273ea72c 944
3bd1e081 945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
951
952 /* Inifinite blocking call, waiting for transmission */
5eb91c98 953 ret = lttng_poll_wait(&events, -1);
273ea72c 954 if (ret < 0) {
273ea72c
DG
955 goto error;
956 }
957
5eb91c98
DG
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
3bd1e081 970 if (pollfd == consumer_data->err_sock) {
5eb91c98 971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 972 ERR("consumer err socket poll error");
5eb91c98
DG
973 goto error;
974 }
975 }
273ea72c
DG
976 }
977
3bd1e081 978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
979 if (sock < 0) {
980 goto error;
981 }
982
3bd1e081 983 DBG2("Receiving code from consumer err_sock");
ee0b0061 984
712ea556 985 /* Getting status code from kconsumerd */
54d01ffb
DG
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
1d4b027a
DG
988 if (ret <= 0) {
989 goto error;
990 }
991
3bd1e081
MD
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
48842b30 997 PERROR("consumer connect");
1d4b027a
DG
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1d4b027a 1003 } else {
3bd1e081 1004 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
54d01ffb 1009 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1011 if (ret < 0) {
72079cae
DG
1012 goto error;
1013 }
1014
5eb91c98
DG
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
72079cae 1017 goto error;
5eb91c98
DG
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
72079cae
DG
1026 goto error;
1027 }
1028
5eb91c98
DG
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1043 ERR("consumer err socket second poll error");
5eb91c98
DG
1044 goto error;
1045 }
1046 }
1047 }
1048
712ea556 1049 /* Wait for any kconsumerd error */
54d01ffb
DG
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
712ea556 1052 if (ret <= 0) {
3bd1e081 1053 ERR("consumer closed the command socket");
712ea556 1054 goto error;
6f61d021 1055 }
1d4b027a 1056
3bd1e081 1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1058
1d4b027a 1059error:
3bd1e081
MD
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
5eb91c98 1063 close(sock);
273ea72c 1064
3bd1e081
MD
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1d4b027a 1068
5eb91c98 1069 lttng_poll_clean(&events);
0177d773 1070
5eb91c98 1071 return NULL;
099e26bd
DG
1072}
1073
099e26bd
DG
1074/*
1075 * This thread manage application communication.
1d4b027a
DG
1076 */
1077static void *thread_manage_apps(void *data)
099e26bd 1078{
5eb91c98
DG
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
099e26bd 1081 struct ust_command ust_cmd;
5eb91c98 1082 struct lttng_poll_event events;
099e26bd
DG
1083
1084 DBG("[thread] Manage application started");
1085
f6a9efaa
DG
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
5eb91c98
DG
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
099e26bd 1098
5eb91c98
DG
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
0177d773 1102
5eb91c98 1103 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1108 ret = lttng_poll_wait(&events, -1);
099e26bd 1109 if (ret < 0) {
099e26bd
DG
1110 goto error;
1111 }
1112
5eb91c98
DG
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
099e26bd 1121 goto error;
5eb91c98 1122 }
099e26bd 1123
5eb91c98
DG
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
0177d773 1128 goto error;
5eb91c98
DG
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
099e26bd 1136
5eb91c98 1137 /* Register applicaton to the session daemon */
56fff090 1138 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1139 ust_cmd.sock);
88ff5b7f 1140 if (ret == -ENOMEM) {
5eb91c98 1141 goto error;
88ff5b7f
MD
1142 } else if (ret < 0) {
1143 break;
5eb91c98
DG
1144 }
1145
acc7b41b
MD
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
5eb91c98
DG
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
56fff090 1158 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
54d01ffb
DG
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
5eb91c98 1171 }
487cf67c 1172
5eb91c98 1173 break;
0177d773 1174 }
5eb91c98
DG
1175 } else {
1176 /*
54d01ffb
DG
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
5eb91c98
DG
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
099e26bd 1186
b9d9b220 1187 /* Socket closed on remote end. */
56fff090 1188 ust_app_unregister(pollfd);
5eb91c98
DG
1189 break;
1190 }
099e26bd
DG
1191 }
1192 }
099e26bd
DG
1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
5eb91c98 1200 lttng_poll_clean(&events);
099e26bd 1201
f6a9efaa
DG
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
099e26bd
DG
1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
00a17c97 1227 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
2f50c8a3
DG
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1d4b027a 1275{
5eb91c98
DG
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
099e26bd
DG
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1d4b027a 1284
099e26bd 1285 DBG("[thread] Manage application registration started");
1d4b027a
DG
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
5eb91c98
DG
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
273ea72c 1300
5eb91c98
DG
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
273ea72c 1306
1d4b027a 1307 /* Notify all applications to register */
0fdd1e2c
DG
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
0fdd1e2c 1313 }
1d4b027a
DG
1314
1315 while (1) {
1316 DBG("Accepting application registration");
273ea72c 1317
5eb91c98
DG
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
273ea72c 1320 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1321 ret = lttng_poll_wait(&events, -1);
273ea72c 1322 if (ret < 0) {
273ea72c
DG
1323 goto error;
1324 }
1325
5eb91c98
DG
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1330
5eb91c98
DG
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
90014c57
DG
1334 goto error;
1335 }
1d4b027a 1336
5eb91c98
DG
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
099e26bd 1347
5eb91c98 1348 /* Create UST registration command for enqueuing */
ba7f0ae5 1349 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1350 if (ust_cmd == NULL) {
ba7f0ae5 1351 perror("ust command zmalloc");
5eb91c98
DG
1352 goto error;
1353 }
1d4b027a 1354
5eb91c98
DG
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
099e26bd 1371
5eb91c98 1372 ust_cmd->sock = sock;
099e26bd 1373
5eb91c98
DG
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1380
5eb91c98
DG
1381 /*
1382 * Lock free enqueue the registration request. The red pill
54d01ffb 1383 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
90014c57 1394 }
1d4b027a
DG
1395 }
1396
1397error:
0fdd1e2c
DG
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
273ea72c 1405 unlink(apps_unix_sock_path);
0fdd1e2c 1406
5eb91c98
DG
1407 lttng_poll_clean(&events);
1408
1d4b027a
DG
1409 return NULL;
1410}
1411
8c0faa1d 1412/*
3bd1e081 1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1414 * exec or it will fails.
8c0faa1d 1415 */
3bd1e081 1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1417{
1418 int ret;
ee0b0061
DG
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
8c0faa1d
DG
1423
1424 /* Setup semaphore */
3bd1e081 1425 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1426 if (ret < 0) {
3bd1e081 1427 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1428 goto error;
1429 }
8c0faa1d 1430
3bd1e081
MD
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
8c0faa1d 1433 if (ret != 0) {
3bd1e081 1434 PERROR("pthread_create consumer");
ee0b0061 1435 ret = -1;
8c0faa1d
DG
1436 goto error;
1437 }
1438
ee0b0061
DG
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
3bd1e081 1442 PERROR("clock_gettime spawn consumer");
ee0b0061 1443 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1444 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1449 }
8c0faa1d 1450
ee0b0061
DG
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
3bd1e081
MD
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1459 if (ret < 0) {
3bd1e081 1460 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1461 }
1462 } else {
3bd1e081 1463 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1464 }
1465 goto error;
1466 }
1467
3bd1e081
MD
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
712ea556 1470 ERR("Kconsumerd did not start");
3bd1e081 1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1472 goto error;
1473 }
3bd1e081 1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1475
8c0faa1d
DG
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
d9800920 1482/*
3bd1e081 1483 * Join consumer thread
d9800920 1484 */
3bd1e081 1485static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1486{
1487 void *status;
1488 int ret;
1489
3bd1e081
MD
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1492 if (ret) {
3bd1e081 1493 ERR("Error killing consumer daemon");
cf3af59e
MD
1494 return ret;
1495 }
3bd1e081 1496 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1497 } else {
1498 return 0;
1499 }
1500}
1501
8c0faa1d 1502/*
3bd1e081 1503 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1504 *
d063d709 1505 * Return pid if successful else -1.
8c0faa1d 1506 */
3bd1e081 1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1508{
1509 int ret;
1510 pid_t pid;
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
AM
1529 /*
1530 * Find out which consumerd to execute. We will first
1531 * try the 64-bit path, then the 32-bit one, then
1532 * fallback on sessiond's installation directory.
1533 */
1534 if (stat(consumerd64_bin, &st) == 0) {
1535 consumer_to_use = consumerd64_bin;
94c55f17
AM
1536 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1537 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4
MD
1538 } else if (stat(consumerd32_bin, &st) == 0) {
1539 consumer_to_use = consumerd32_bin;
94c55f17
AM
1540 } else {
1541 break;
1542 }
1543 DBG("Using kernel consumer at: %s", consumer_to_use);
1544 execl(consumer_to_use,
1545 "lttng-consumerd", verbosity, "-k",
1546 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1547 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1548 NULL);
3bd1e081 1549 break;
7753dea8
MD
1550 case LTTNG_CONSUMER64_UST:
1551 {
b1e0b6b6 1552 char *tmpnew = NULL;
8f4905da
MD
1553
1554 if (consumerd64_libdir[0] != '\0') {
1555 char *tmp;
1556 size_t tmplen;
1557
1558 tmp = getenv("LD_LIBRARY_PATH");
1559 if (!tmp) {
1560 tmp = "";
1561 }
1562 tmplen = strlen("LD_LIBRARY_PATH=")
1563 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1564 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1565 if (!tmpnew) {
1566 ret = -ENOMEM;
1567 goto error;
1568 }
1569 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1570 strcat(tmpnew, consumerd64_libdir);
1571 if (tmp[0] != '\0') {
1572 strcat(tmpnew, ":");
1573 strcat(tmpnew, tmp);
1574 }
1575 ret = putenv(tmpnew);
1576 if (ret) {
1577 ret = -errno;
1578 goto error;
1579 }
1580 }
94c55f17 1581 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
fc7a59ce 1582 ret = execl(consumerd64_bin, verbosity, "-u",
7753dea8
MD
1583 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1584 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1585 NULL);
8f4905da
MD
1586 if (consumerd64_libdir[0] != '\0') {
1587 free(tmpnew);
1588 }
1589 if (ret) {
1590 goto error;
1591 }
3bd1e081 1592 break;
7753dea8
MD
1593 }
1594 case LTTNG_CONSUMER32_UST:
1595 {
937dde8e 1596 char *tmpnew = NULL;
8f4905da
MD
1597
1598 if (consumerd32_libdir[0] != '\0') {
1599 char *tmp;
1600 size_t tmplen;
1601
1602 tmp = getenv("LD_LIBRARY_PATH");
1603 if (!tmp) {
1604 tmp = "";
1605 }
1606 tmplen = strlen("LD_LIBRARY_PATH=")
1607 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1608 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1609 if (!tmpnew) {
1610 ret = -ENOMEM;
1611 goto error;
1612 }
1613 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1614 strcat(tmpnew, consumerd32_libdir);
1615 if (tmp[0] != '\0') {
1616 strcat(tmpnew, ":");
1617 strcat(tmpnew, tmp);
1618 }
1619 ret = putenv(tmpnew);
1620 if (ret) {
1621 ret = -errno;
1622 goto error;
1623 }
1624 }
94c55f17 1625 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
fc7a59ce 1626 ret = execl(consumerd32_bin, verbosity, "-u",
7753dea8
MD
1627 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1628 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1629 NULL);
8f4905da
MD
1630 if (consumerd32_libdir[0] != '\0') {
1631 free(tmpnew);
1632 }
1633 if (ret) {
1634 goto error;
1635 }
7753dea8
MD
1636 break;
1637 }
3bd1e081
MD
1638 default:
1639 perror("unknown consumer type");
1640 exit(EXIT_FAILURE);
1641 }
8c0faa1d
DG
1642 if (errno != 0) {
1643 perror("kernel start consumer exec");
1644 }
1645 exit(EXIT_FAILURE);
1646 } else if (pid > 0) {
1647 ret = pid;
8c0faa1d 1648 } else {
3bd1e081 1649 perror("start consumer fork");
8c0faa1d 1650 ret = -errno;
8c0faa1d 1651 }
8f4905da 1652error:
8c0faa1d
DG
1653 return ret;
1654}
1655
693bd40b 1656/*
3bd1e081 1657 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1658 */
3bd1e081 1659static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1660{
1661 int ret;
1662
3bd1e081
MD
1663 pthread_mutex_lock(&consumer_data->pid_mutex);
1664 if (consumer_data->pid != 0) {
1665 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1666 goto end;
1667 }
693bd40b 1668
3bd1e081 1669 ret = spawn_consumerd(consumer_data);
c49dc785 1670 if (ret < 0) {
3bd1e081
MD
1671 ERR("Spawning consumerd failed");
1672 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1673 goto error;
693bd40b 1674 }
c49dc785 1675
3bd1e081
MD
1676 /* Setting up the consumer_data pid */
1677 consumer_data->pid = ret;
48842b30 1678 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1679 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1680
3bd1e081
MD
1681 DBG2("Spawning consumer control thread");
1682 ret = spawn_consumer_thread(consumer_data);
693bd40b 1683 if (ret < 0) {
3bd1e081 1684 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1685 goto error;
1686 }
1687
c49dc785 1688end:
693bd40b
DG
1689 return 0;
1690
1691error:
1692 return ret;
1693}
1694
b73401da 1695/*
d063d709 1696 * modprobe_kernel_modules
b73401da
DG
1697 */
1698static int modprobe_kernel_modules(void)
1699{
ab147185 1700 int ret = 0, i;
b73401da
DG
1701 char modprobe[256];
1702
ab147185
MD
1703 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1704 ret = snprintf(modprobe, sizeof(modprobe),
1705 "/sbin/modprobe %s%s",
24b487b8 1706 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1707 kernel_modules_list[i].name);
b73401da
DG
1708 if (ret < 0) {
1709 perror("snprintf modprobe");
1710 goto error;
1711 }
ab147185 1712 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1713 ret = system(modprobe);
ab147185
MD
1714 if (ret == -1) {
1715 ERR("Unable to launch modprobe for module %s",
1716 kernel_modules_list[i].name);
1717 } else if (kernel_modules_list[i].required
d9800920 1718 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1719 ERR("Unable to load module %s",
1720 kernel_modules_list[i].name);
1721 } else {
1722 DBG("Modprobe successfully %s",
1723 kernel_modules_list[i].name);
1724 }
1725 }
1726
1727error:
1728 return ret;
1729}
1730
b73401da 1731/*
d063d709 1732 * mount_debugfs
b73401da
DG
1733 */
1734static int mount_debugfs(char *path)
1735{
1736 int ret;
1737 char *type = "debugfs";
1738
996b65c8 1739 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1740 if (ret < 0) {
7272acf5 1741 PERROR("Cannot create debugfs path");
b73401da
DG
1742 goto error;
1743 }
1744
1745 ret = mount(type, path, type, 0, NULL);
1746 if (ret < 0) {
7272acf5 1747 PERROR("Cannot mount debugfs");
b73401da
DG
1748 goto error;
1749 }
1750
1751 DBG("Mounted debugfs successfully at %s", path);
1752
1753error:
1754 return ret;
1755}
1756
8c0faa1d 1757/*
d063d709 1758 * Setup necessary data for kernel tracer action.
8c0faa1d 1759 */
f3ed775e 1760static void init_kernel_tracer(void)
8c0faa1d 1761{
b73401da
DG
1762 int ret;
1763 char *proc_mounts = "/proc/mounts";
1764 char line[256];
684d34d2 1765 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1766 FILE *fp;
1767
1768 /* Detect debugfs */
1769 fp = fopen(proc_mounts, "r");
1770 if (fp == NULL) {
1771 ERR("Unable to probe %s", proc_mounts);
1772 goto error;
1773 }
1774
1775 while (fgets(line, sizeof(line), fp) != NULL) {
1776 if (strstr(line, "debugfs") != NULL) {
1777 /* Remove first string */
1778 strtok(line, " ");
1779 /* Dup string here so we can reuse line later on */
1780 debugfs_path = strdup(strtok(NULL, " "));
1781 DBG("Got debugfs path : %s", debugfs_path);
1782 break;
1783 }
1784 }
1785
1786 fclose(fp);
1787
1788 /* Mount debugfs if needded */
1789 if (debugfs_path == NULL) {
1790 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1791 if (ret < 0) {
1792 perror("asprintf debugfs path");
1793 goto error;
1794 }
1795 ret = mount_debugfs(debugfs_path);
1796 if (ret < 0) {
7272acf5 1797 perror("Cannot mount debugfs");
b73401da
DG
1798 goto error;
1799 }
1800 }
1801
1802 /* Modprobe lttng kernel modules */
1803 ret = modprobe_kernel_modules();
1804 if (ret < 0) {
1805 goto error;
1806 }
1807
1808 /* Setup lttng kernel path */
1809 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1810 if (ret < 0) {
1811 perror("asprintf lttng path");
1812 goto error;
1813 }
1814
1815 /* Open debugfs lttng */
1816 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1817 if (kernel_tracer_fd < 0) {
b73401da
DG
1818 DBG("Failed to open %s", lttng_path);
1819 goto error;
8c0faa1d
DG
1820 }
1821
b73401da
DG
1822 free(lttng_path);
1823 free(debugfs_path);
f3ed775e 1824 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1825 return;
1826
1827error:
1828 if (lttng_path) {
1829 free(lttng_path);
1830 }
1831 if (debugfs_path) {
1832 free(debugfs_path);
1833 }
1834 WARN("No kernel tracer available");
1835 kernel_tracer_fd = 0;
1836 return;
f3ed775e 1837}
33a2b854 1838
f3ed775e 1839/*
54d01ffb 1840 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1841 */
54d01ffb 1842static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1843{
f40799e8 1844 int ret = 0;
8c0faa1d 1845
3bd1e081 1846 if (session->consumer_fds_sent == 0) {
d9800920 1847 /*
54d01ffb
DG
1848 * Assign default kernel consumer socket if no consumer assigned to the
1849 * kernel session. At this point, it's NOT suppose to be 0 but this is
1850 * an extra security check.
d9800920
DG
1851 */
1852 if (session->consumer_fd == 0) {
3bd1e081 1853 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1854 }
1855
2bdd86d4 1856 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1857 if (ret < 0) {
f3ed775e
DG
1858 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1859 goto error;
1860 }
1d4b027a 1861
3bd1e081 1862 session->consumer_fds_sent = 1;
f3ed775e 1863 }
1d4b027a
DG
1864
1865error:
1866 return ret;
8c0faa1d
DG
1867}
1868
0177d773
DG
1869/*
1870 * Create an UST session and add it to the session ust list.
1871 */
44d3bd01
DG
1872static int create_ust_session(struct ltt_session *session,
1873 struct lttng_domain *domain)
0177d773 1874{
44d3bd01 1875 int ret;
48842b30 1876 unsigned int uid;
13384287 1877 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1878
1879 switch (domain->type) {
48842b30 1880 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1881 break;
1882 default:
13384287 1883 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1884 goto error;
1885 }
0177d773
DG
1886
1887 DBG("Creating UST session");
1888
44e96653 1889 uid = session->uid;
48842b30 1890 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1891 if (lus == NULL) {
44d3bd01 1892 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1893 goto error;
1894 }
1895
48842b30 1896 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1897 geteuid(), allowed_group());
1898 if (ret < 0) {
1899 if (ret != -EEXIST) {
1900 ERR("Trace directory creation error");
44d3bd01 1901 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1902 goto error;
1903 }
1904 }
1905
f6a9efaa
DG
1906 /* The domain type dictate different actions on session creation */
1907 switch (domain->type) {
48842b30
DG
1908 case LTTNG_DOMAIN_UST:
1909 /* No ustctl for the global UST domain */
1910 break;
1911 default:
36dc12cc 1912 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1913 goto error;
0177d773 1914 }
f6a9efaa 1915 session->ust_session = lus;
44d3bd01
DG
1916
1917 return LTTCOMM_OK;
0177d773
DG
1918
1919error:
1920 free(lus);
1921 return ret;
1922}
1923
333f285e 1924/*
d063d709 1925 * Create a kernel tracer session then create the default channel.
333f285e 1926 */
f3ed775e 1927static int create_kernel_session(struct ltt_session *session)
333f285e 1928{
f3ed775e 1929 int ret;
f3ed775e
DG
1930
1931 DBG("Creating kernel session");
1932
1933 ret = kernel_create_session(session, kernel_tracer_fd);
1934 if (ret < 0) {
1935 ret = LTTCOMM_KERN_SESS_FAIL;
1936 goto error;
333f285e
DG
1937 }
1938
d9800920 1939 /* Set kernel consumer socket fd */
3bd1e081
MD
1940 if (kconsumer_data.cmd_sock) {
1941 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1942 }
1943
63053e7c
DG
1944 ret = mkdir_recursive(session->kernel_session->trace_path,
1945 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1946 if (ret < 0) {
996b65c8 1947 if (ret != -EEXIST) {
7a485870
DG
1948 ERR("Trace directory creation error");
1949 goto error;
1950 }
1951 }
1952
f3ed775e
DG
1953error:
1954 return ret;
333f285e
DG
1955}
1956
6c9cc2ab
DG
1957/*
1958 * Using the session list, filled a lttng_session array to send back to the
1959 * client for session listing.
1960 *
1961 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1962 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1963 */
1964static void list_lttng_sessions(struct lttng_session *sessions)
1965{
1966 int i = 0;
1967 struct ltt_session *session;
1968
1969 DBG("Getting all available session");
1970 /*
1971 * Iterate over session list and append data after the control struct in
1972 * the buffer.
1973 */
1974 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1975 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1976 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1977 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1978 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1979 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1980 i++;
1981 }
1982}
1983
9f19cc17
DG
1984/*
1985 * Fill lttng_channel array of all channels.
1986 */
b551a063 1987static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1988 struct lttng_channel *channels)
1989{
1990 int i = 0;
1991 struct ltt_kernel_channel *kchan;
1992
1993 DBG("Listing channels for session %s", session->name);
1994
b551a063
DG
1995 switch (domain) {
1996 case LTTNG_DOMAIN_KERNEL:
1997 /* Kernel channels */
1998 if (session->kernel_session != NULL) {
1999 cds_list_for_each_entry(kchan,
2000 &session->kernel_session->channel_list.head, list) {
2001 /* Copy lttng_channel struct to array */
2002 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2003 channels[i].enabled = kchan->enabled;
2004 i++;
2005 }
2006 }
2007 break;
2008 case LTTNG_DOMAIN_UST:
2009 {
2010 struct cds_lfht_iter iter;
2011 struct ltt_ust_channel *uchan;
2012
2013 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2014 &iter, uchan, node) {
2015 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2016 channels[i].attr.overwrite = uchan->attr.overwrite;
2017 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2018 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2019 channels[i].attr.switch_timer_interval =
2020 uchan->attr.switch_timer_interval;
2021 channels[i].attr.read_timer_interval =
2022 uchan->attr.read_timer_interval;
aea829b3 2023 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2024 switch (uchan->attr.output) {
2025 case LTTNG_UST_MMAP:
2026 default:
2027 channels[i].attr.output = LTTNG_EVENT_MMAP;
2028 break;
2029 }
befe0905 2030 i++;
b551a063
DG
2031 }
2032 break;
2033 }
2034 default:
2035 break;
2036 }
2037}
2038
2039/*
2040 * Create a list of ust global domain events.
2041 */
2042static int list_lttng_ust_global_events(char *channel_name,
2043 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2044{
2045 int i = 0, ret = 0;
2046 unsigned int nb_event = 0;
2047 struct cds_lfht_iter iter;
d7b75b30 2048 struct cds_lfht_node *node;
b551a063
DG
2049 struct ltt_ust_channel *uchan;
2050 struct ltt_ust_event *uevent;
2051 struct lttng_event *tmp;
2052
2053 DBG("Listing UST global events for channel %s", channel_name);
2054
2055 rcu_read_lock();
2056
d7b75b30
DG
2057 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2058 strlen(channel_name), &iter);
2059 if (node == NULL) {
2060 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2061 goto error;
b551a063
DG
2062 }
2063
d7b75b30
DG
2064 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2065
2066 nb_event += hashtable_get_count(uchan->events);
2067
b551a063
DG
2068 if (nb_event == 0) {
2069 ret = nb_event;
2070 goto error;
2071 }
2072
2073 DBG3("Listing UST global %d events", nb_event);
2074
2075 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2076 if (tmp == NULL) {
2077 ret = -LTTCOMM_FATAL;
2078 goto error;
2079 }
2080
d7b75b30
DG
2081 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2082 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2083 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2084 tmp[i].enabled = uevent->enabled;
2085 switch (uevent->attr.instrumentation) {
2086 case LTTNG_UST_TRACEPOINT:
2087 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2088 break;
2089 case LTTNG_UST_PROBE:
2090 tmp[i].type = LTTNG_EVENT_PROBE;
2091 break;
2092 case LTTNG_UST_FUNCTION:
2093 tmp[i].type = LTTNG_EVENT_FUNCTION;
2094 break;
ac3bd9c0 2095 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2096 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2097 break;
9f19cc17 2098 }
d7b75b30 2099 i++;
9f19cc17
DG
2100 }
2101
b551a063
DG
2102 ret = nb_event;
2103 *events = tmp;
2104
2105error:
2106 rcu_read_unlock();
2107 return ret;
9f19cc17
DG
2108}
2109
2110/*
b551a063 2111 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2112 */
b551a063
DG
2113static int list_lttng_kernel_events(char *channel_name,
2114 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2115{
b551a063
DG
2116 int i = 0, ret;
2117 unsigned int nb_event;
9f19cc17 2118 struct ltt_kernel_event *event;
b551a063
DG
2119 struct ltt_kernel_channel *kchan;
2120
2121 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2122 if (kchan == NULL) {
2123 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2124 goto error;
2125 }
2126
2127 nb_event = kchan->event_count;
9f19cc17
DG
2128
2129 DBG("Listing events for channel %s", kchan->channel->name);
2130
b551a063
DG
2131 if (nb_event == 0) {
2132 ret = nb_event;
2133 goto error;
2134 }
2135
2136 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2137 if (*events == NULL) {
2138 ret = LTTCOMM_FATAL;
2139 goto error;
2140 }
2141
9f19cc17
DG
2142 /* Kernel channels */
2143 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2144 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2145 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2146 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2147 switch (event->event->instrumentation) {
2148 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2149 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2150 break;
2151 case LTTNG_KERNEL_KPROBE:
2152 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2153 (*events)[i].type = LTTNG_EVENT_PROBE;
2154 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2155 sizeof(struct lttng_kernel_kprobe));
2156 break;
2157 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2158 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2159 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2160 sizeof(struct lttng_kernel_function));
2161 break;
0133c199 2162 case LTTNG_KERNEL_NOOP:
b551a063 2163 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2164 break;
a54bd42d 2165 case LTTNG_KERNEL_SYSCALL:
b551a063 2166 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2167 break;
7a3d1328
MD
2168 case LTTNG_KERNEL_ALL:
2169 assert(0);
2170 break;
9f19cc17
DG
2171 }
2172 i++;
2173 }
b551a063
DG
2174
2175 return nb_event;
2176
2177error:
2178 return ret;
9f19cc17
DG
2179}
2180
fac6795d 2181/*
54d01ffb 2182 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2183 */
54d01ffb
DG
2184static int cmd_disable_channel(struct ltt_session *session,
2185 int domain, char *channel_name)
fac6795d 2186{
54d01ffb 2187 int ret;
78f0bacd
DG
2188 struct ltt_ust_session *usess;
2189
2190 usess = session->ust_session;
379473d2 2191
54d01ffb 2192 switch (domain) {
78f0bacd
DG
2193 case LTTNG_DOMAIN_KERNEL:
2194 {
2195 ret = channel_kernel_disable(session->kernel_session,
2196 channel_name);
2197 if (ret != LTTCOMM_OK) {
2198 goto error;
2199 }
54d01ffb 2200
78f0bacd
DG
2201 kernel_wait_quiescent(kernel_tracer_fd);
2202 break;
2203 }
2204 case LTTNG_DOMAIN_UST:
2205 {
2206 struct ltt_ust_channel *uchan;
2207
2208 /* Get channel in global UST domain HT */
2209 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2210 channel_name);
2211 if (uchan == NULL) {
2212 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2213 goto error;
78f0bacd
DG
2214 }
2215
8535a6d9
DG
2216 /* Already disabled */
2217 if (!uchan->enabled) {
2218 DBG2("UST channel %s already disabled", channel_name);
2219 break;
2220 }
2221
35a9059d 2222 ret = ust_app_disable_channel_glb(usess, uchan);
78f0bacd
DG
2223 if (ret < 0) {
2224 ret = LTTCOMM_UST_DISABLE_FAIL;
2225 goto error;
2226 }
2227
2228 uchan->enabled = 0;
2229
2230 break;
2231 }
2232 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2233 case LTTNG_DOMAIN_UST_EXEC_NAME:
2234 case LTTNG_DOMAIN_UST_PID:
2235 ret = LTTCOMM_NOT_IMPLEMENTED;
2236 goto error;
2237 default:
2238 ret = LTTCOMM_UNKNOWN_DOMAIN;
2239 goto error;
20fe2104
DG
2240 }
2241
54d01ffb 2242 ret = LTTCOMM_OK;
d65106b1 2243
54d01ffb
DG
2244error:
2245 return ret;
2246}
2247
56fff090
DG
2248/*
2249 * Copy channel from attributes and set it in the application channel list.
2250 */
f6a9efaa 2251/*
56fff090
DG
2252static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2253 struct lttng_channel *attr, struct ust_app *app)
2254{
2255 int ret;
2256 struct ltt_ust_channel *uchan, *new_chan;
2257
f6a9efaa 2258 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2259 if (uchan == NULL) {
2260 ret = LTTCOMM_FATAL;
2261 goto error;
2262 }
2263
2264 new_chan = trace_ust_create_channel(attr, usess->path);
2265 if (new_chan == NULL) {
2266 PERROR("malloc ltt_ust_channel");
2267 ret = LTTCOMM_FATAL;
2268 goto error;
2269 }
2270
2271 ret = channel_ust_copy(new_chan, uchan);
2272 if (ret < 0) {
2273 ret = LTTCOMM_FATAL;
2274 goto error;
2275 }
2276
56fff090
DG
2277error:
2278 return ret;
2279}
f6a9efaa 2280*/
56fff090 2281
54d01ffb
DG
2282/*
2283 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2284 */
44d3bd01 2285static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2286 int domain, struct lttng_channel *attr)
54d01ffb
DG
2287{
2288 int ret;
f6a9efaa
DG
2289 struct ltt_ust_session *usess = session->ust_session;
2290
5d56b5aa 2291 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2292
aea829b3 2293 switch (domain) {
44d3bd01
DG
2294 case LTTNG_DOMAIN_KERNEL:
2295 {
2296 struct ltt_kernel_channel *kchan;
54d01ffb 2297
44d3bd01
DG
2298 kchan = trace_kernel_get_channel_by_name(attr->name,
2299 session->kernel_session);
2300 if (kchan == NULL) {
2301 ret = channel_kernel_create(session->kernel_session,
2302 attr, kernel_poll_pipe[1]);
2303 } else {
2304 ret = channel_kernel_enable(session->kernel_session, kchan);
2305 }
2306
2307 if (ret != LTTCOMM_OK) {
2308 goto error;
2309 }
2310
2311 kernel_wait_quiescent(kernel_tracer_fd);
2312 break;
2313 }
f6a9efaa
DG
2314 case LTTNG_DOMAIN_UST:
2315 {
2316 struct ltt_ust_channel *uchan;
2317
48842b30 2318 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2319
48842b30 2320 /* Get channel in global UST domain HT */
f6a9efaa
DG
2321 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2322 attr->name);
2323 if (uchan == NULL) {
48842b30 2324 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2325 if (uchan == NULL) {
2326 ret = LTTCOMM_UST_CHAN_FAIL;
2327 goto error;
2328 }
d5cd1f34 2329
78f0bacd 2330 /* Add channel to all registered applications */
35a9059d 2331 ret = ust_app_create_channel_glb(usess, uchan);
78f0bacd
DG
2332 if (ret != 0) {
2333 ret = LTTCOMM_UST_CHAN_FAIL;
2334 goto error;
2335 }
8535a6d9
DG
2336
2337 rcu_read_lock();
2338 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2339 rcu_read_unlock();
2340
2341 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa 2342 } else {
78f0bacd
DG
2343 /* If already enabled, everything is OK */
2344 if (uchan->enabled) {
8535a6d9 2345 break;
78f0bacd 2346 }
f6a9efaa 2347
35a9059d 2348 ret = ust_app_enable_channel_glb(usess, uchan);
78f0bacd 2349 if (ret < 0) {
8535a6d9
DG
2350 if (ret != -EEXIST) {
2351 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2352 goto error;
2353 } else {
2354 ret = LTTCOMM_OK;
2355 }
78f0bacd 2356 }
48842b30 2357 }
f6a9efaa 2358
37357452
DG
2359 uchan->enabled = 1;
2360
f6a9efaa
DG
2361 break;
2362 }
78f0bacd
DG
2363 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2364 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2365 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG
2366 ret = LTTCOMM_NOT_IMPLEMENTED;
2367 goto error;
44d3bd01
DG
2368 default:
2369 ret = LTTCOMM_UNKNOWN_DOMAIN;
2370 goto error;
54d01ffb
DG
2371 }
2372
2373 ret = LTTCOMM_OK;
2374
2375error:
2376 return ret;
2377}
2378
2379/*
2380 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2381 */
2382static int cmd_disable_event(struct ltt_session *session, int domain,
2383 char *channel_name, char *event_name)
2384{
2385 int ret;
54d01ffb
DG
2386
2387 switch (domain) {
2388 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2389 {
2390 struct ltt_kernel_channel *kchan;
b0a40d28 2391 struct ltt_kernel_session *ksess;
2bdd86d4 2392
b0a40d28
DG
2393 ksess = session->kernel_session;
2394
2395 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2396 if (kchan == NULL) {
2397 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2398 goto error;
d65106b1
DG
2399 }
2400
b0a40d28 2401 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2402 if (ret != LTTCOMM_OK) {
2403 goto error;
2404 }
2405
2406 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2407 break;
2bdd86d4
MD
2408 }
2409 case LTTNG_DOMAIN_UST:
b0a40d28
DG
2410 {
2411 struct ltt_ust_session *usess;
2412 struct ltt_ust_channel *uchan;
35a9059d 2413 struct ltt_ust_event *uevent;
b0a40d28
DG
2414
2415 usess = session->ust_session;
2416
2417 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2418 channel_name);
2419 if (uchan == NULL) {
2420 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2421 goto error;
2422 }
2423
35a9059d
DG
2424 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2425 if (uevent == NULL) {
2426 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2427 goto error;
2428 }
2429
2430 ret = ust_app_disable_event_glb(usess, uchan, uevent);
b0a40d28
DG
2431 if (ret < 0) {
2432 ret = LTTCOMM_UST_DISABLE_FAIL;
2433 goto error;
2434 }
2435
35a9059d
DG
2436 uevent->enabled = 0;
2437
b0a40d28
DG
2438 DBG2("Disable UST event %s in channel %s completed", event_name,
2439 channel_name);
2440
2441 break;
2442 }
2bdd86d4
MD
2443 case LTTNG_DOMAIN_UST_EXEC_NAME:
2444 case LTTNG_DOMAIN_UST_PID:
2445 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2446 default:
54d01ffb
DG
2447 ret = LTTCOMM_NOT_IMPLEMENTED;
2448 goto error;
d65106b1 2449 }
26cc6b4e 2450
54d01ffb
DG
2451 ret = LTTCOMM_OK;
2452
2453error:
2454 return ret;
2455}
2456
2457/*
2458 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2459 */
2460static int cmd_disable_event_all(struct ltt_session *session, int domain,
2461 char *channel_name)
2462{
2463 int ret;
54d01ffb
DG
2464
2465 switch (domain) {
2466 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2467 {
2468 struct ltt_kernel_session *ksess;
2469 struct ltt_kernel_channel *kchan;
2470
2471 ksess = session->kernel_session;
2472
2473 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2474 if (kchan == NULL) {
2475 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2476 goto error;
26cc6b4e
DG
2477 }
2478
9730260e 2479 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2480 if (ret != LTTCOMM_OK) {
0b97ec54 2481 goto error;
26cc6b4e
DG
2482 }
2483
54d01ffb 2484 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2485 break;
9730260e
DG
2486 }
2487 case LTTNG_DOMAIN_UST:
2488 {
2489 struct ltt_ust_session *usess;
2490 struct ltt_ust_channel *uchan;
2491
2492 usess = session->ust_session;
2493
2494 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2495 channel_name);
2496 if (uchan == NULL) {
2497 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2498 goto error;
2499 }
2500
35a9059d 2501 ret = ust_app_disable_all_event_glb(usess, uchan);
9730260e
DG
2502 if (ret < 0) {
2503 ret = LTTCOMM_UST_DISABLE_FAIL;
2504 goto error;
2505 }
2506
2507 DBG2("Disable all UST event in channel %s completed", channel_name);
2508
2509 break;
2510 }
2511 case LTTNG_DOMAIN_UST_EXEC_NAME:
2512 case LTTNG_DOMAIN_UST_PID:
2513 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2514 default:
54d01ffb
DG
2515 ret = LTTCOMM_NOT_IMPLEMENTED;
2516 goto error;
26cc6b4e 2517 }
e953ef25 2518
54d01ffb 2519 ret = LTTCOMM_OK;
e953ef25 2520
54d01ffb
DG
2521error:
2522 return ret;
2523}
f5177a38 2524
54d01ffb
DG
2525/*
2526 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2527 */
2528static int cmd_add_context(struct ltt_session *session, int domain,
2529 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2530{
2531 int ret;
f5177a38 2532
54d01ffb
DG
2533 switch (domain) {
2534 case LTTNG_DOMAIN_KERNEL:
2535 /* Add kernel context to kernel tracer */
2536 ret = context_kernel_add(session->kernel_session, ctx,
2537 event_name, channel_name);
2538 if (ret != LTTCOMM_OK) {
f5177a38 2539 goto error;
e953ef25 2540 }
2bdd86d4
MD
2541 break;
2542 case LTTNG_DOMAIN_UST:
2543 {
55cc08a6 2544 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2545
55cc08a6
DG
2546 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2547 if (ret != LTTCOMM_OK) {
2548 goto error;
2bdd86d4 2549 }
e953ef25 2550 break;
2bdd86d4 2551 }
55cc08a6
DG
2552 case LTTNG_DOMAIN_UST_EXEC_NAME:
2553 case LTTNG_DOMAIN_UST_PID:
2554 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2555 default:
54d01ffb
DG
2556 ret = LTTCOMM_NOT_IMPLEMENTED;
2557 goto error;
e953ef25 2558 }
950131af 2559
54d01ffb 2560 ret = LTTCOMM_OK;
950131af 2561
54d01ffb
DG
2562error:
2563 return ret;
2564}
2565
2566/*
2567 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD
2568 *
2569 * TODO: currently, both events and loglevels are kept within the same
2570 * namespace for UST global registry/app registery, so if an event
2571 * happen to have the same name as the loglevel (very unlikely though),
2572 * and an attempt is made to enable/disable both in the same session,
2573 * the first to be created will be the only one allowed to exist.
54d01ffb
DG
2574 */
2575static int cmd_enable_event(struct ltt_session *session, int domain,
2576 char *channel_name, struct lttng_event *event)
2577{
2578 int ret;
f6cd6b0f 2579 struct lttng_channel *attr;
48842b30 2580 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2581
2582 switch (domain) {
2583 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2584 {
2585 struct ltt_kernel_channel *kchan;
2586
54d01ffb
DG
2587 kchan = trace_kernel_get_channel_by_name(channel_name,
2588 session->kernel_session);
2589 if (kchan == NULL) {
f6cd6b0f
DG
2590 attr = channel_new_default_attr(domain);
2591 if (attr == NULL) {
2592 ret = LTTCOMM_FATAL;
2593 goto error;
2594 }
2595 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2596
54d01ffb 2597 /* This call will notify the kernel thread */
44d3bd01 2598 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2599 attr, kernel_poll_pipe[1]);
54d01ffb 2600 if (ret != LTTCOMM_OK) {
ff4d74e6 2601 free(attr);
f5177a38
DG
2602 goto error;
2603 }
ff4d74e6 2604 free(attr);
54d01ffb 2605 }
950131af 2606
54d01ffb
DG
2607 /* Get the newly created kernel channel pointer */
2608 kchan = trace_kernel_get_channel_by_name(channel_name,
2609 session->kernel_session);
2610 if (kchan == NULL) {
2611 /* This sould not happen... */
2612 ret = LTTCOMM_FATAL;
2613 goto error;
2614 }
f5177a38 2615
48842b30
DG
2616 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2617 event);
54d01ffb 2618 if (ret != LTTCOMM_OK) {
f5177a38 2619 goto error;
950131af
DG
2620 }
2621
54d01ffb 2622 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2623 break;
2bdd86d4
MD
2624 }
2625 case LTTNG_DOMAIN_UST:
2626 {
aea829b3 2627 struct lttng_channel *attr;
edb67388 2628 struct ltt_ust_channel *uchan;
2bdd86d4 2629
edb67388 2630 /* Get channel from global UST domain */
48842b30
DG
2631 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2632 channel_name);
2633 if (uchan == NULL) {
aea829b3
DG
2634 /* Create default channel */
2635 attr = channel_new_default_attr(domain);
2636 if (attr == NULL) {
2637 ret = LTTCOMM_FATAL;
2638 goto error;
2639 }
596219f7 2640 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2641 attr->name[NAME_MAX - 1] = '\0';
aea829b3
DG
2642
2643 /* Use the internal command enable channel */
2644 ret = cmd_enable_channel(session, domain, attr);
edb67388 2645 if (ret != LTTCOMM_OK) {
ff4d74e6 2646 free(attr);
aea829b3
DG
2647 goto error;
2648 }
aea829b3
DG
2649 free(attr);
2650
2651 /* Get the newly created channel reference back */
2652 uchan = trace_ust_find_channel_by_name(
2653 usess->domain_global.channels, channel_name);
2654 if (uchan == NULL) {
2655 /* Something is really wrong */
2656 ret = LTTCOMM_FATAL;
2657 goto error;
2658 }
48842b30 2659 }
2bdd86d4 2660
edb67388 2661 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2662
edb67388
DG
2663 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2664 if (ret != LTTCOMM_OK) {
48842b30 2665 goto error;
2bdd86d4
MD
2666 }
2667 break;
2668 }
2669 case LTTNG_DOMAIN_UST_EXEC_NAME:
2670 case LTTNG_DOMAIN_UST_PID:
2671 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2672 default:
54d01ffb
DG
2673 ret = LTTCOMM_NOT_IMPLEMENTED;
2674 goto error;
950131af 2675 }
d36b8583 2676
54d01ffb 2677 ret = LTTCOMM_OK;
d36b8583 2678
54d01ffb
DG
2679error:
2680 return ret;
2681}
7d29a247 2682
54d01ffb
DG
2683/*
2684 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2685 */
2686static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2687 char *channel_name, int event_type)
54d01ffb
DG
2688{
2689 int ret;
2690 struct ltt_kernel_channel *kchan;
7d29a247 2691
54d01ffb
DG
2692 switch (domain) {
2693 case LTTNG_DOMAIN_KERNEL:
2694 kchan = trace_kernel_get_channel_by_name(channel_name,
2695 session->kernel_session);
2696 if (kchan == NULL) {
2697 /* This call will notify the kernel thread */
44d3bd01
DG
2698 ret = channel_kernel_create(session->kernel_session, NULL,
2699 kernel_poll_pipe[1]);
54d01ffb
DG
2700 if (ret != LTTCOMM_OK) {
2701 goto error;
d36b8583 2702 }
0d0c377a 2703
8f69e5eb
DG
2704 /* Get the newly created kernel channel pointer */
2705 kchan = trace_kernel_get_channel_by_name(channel_name,
2706 session->kernel_session);
2707 if (kchan == NULL) {
2708 /* This sould not happen... */
2709 ret = LTTCOMM_FATAL;
2710 goto error;
2711 }
2712
54d01ffb 2713 }
0fdd1e2c 2714
7a3d1328 2715 switch (event_type) {
76d45b40 2716 case LTTNG_EVENT_SYSCALL:
7a3d1328 2717 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2718 kchan, kernel_tracer_fd);
7a3d1328 2719 break;
76d45b40 2720 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2721 /*
7a3d1328
MD
2722 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2723 * events already registered to the channel.
8c9ae521 2724 */
7a3d1328
MD
2725 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2726 kchan, kernel_tracer_fd);
2727 break;
76d45b40 2728 case LTTNG_EVENT_ALL:
7a3d1328 2729 /* Enable syscalls and tracepoints */
8c9ae521
DG
2730 ret = event_kernel_enable_all(session->kernel_session,
2731 kchan, kernel_tracer_fd);
7a3d1328
MD
2732 break;
2733 default:
2734 ret = LTTCOMM_KERN_ENABLE_FAIL;
2735 goto error;
8c9ae521 2736 }
8f69e5eb
DG
2737
2738 /* Manage return value */
54d01ffb 2739 if (ret != LTTCOMM_OK) {
0d0c377a 2740 goto error;
d36b8583
DG
2741 }
2742
54d01ffb 2743 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2744 break;
76d45b40
DG
2745 case LTTNG_DOMAIN_UST:
2746 {
2747 struct lttng_channel *attr;
2748 struct ltt_ust_channel *uchan;
2749 struct ltt_ust_session *usess = session->ust_session;
2750
2751 /* Get channel from global UST domain */
2752 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2753 channel_name);
2754 if (uchan == NULL) {
2755 /* Create default channel */
2756 attr = channel_new_default_attr(domain);
2757 if (attr == NULL) {
2758 ret = LTTCOMM_FATAL;
2759 goto error;
2760 }
2761 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2762 attr->name[NAME_MAX - 1] = '\0';
2763
2764 /* Use the internal command enable channel */
2765 ret = cmd_enable_channel(session, domain, attr);
2766 if (ret != LTTCOMM_OK) {
2767 free(attr);
2768 goto error;
2769 }
2770 free(attr);
2771
2772 /* Get the newly created channel reference back */
2773 uchan = trace_ust_find_channel_by_name(
2774 usess->domain_global.channels, channel_name);
2775 if (uchan == NULL) {
2776 /* Something is really wrong */
2777 ret = LTTCOMM_FATAL;
2778 goto error;
2779 }
2780 }
2781
2782 /* At this point, the session and channel exist on the tracer */
2783
2784 switch (event_type) {
2785 case LTTNG_EVENT_ALL:
2786 case LTTNG_EVENT_TRACEPOINT:
2787 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2788 if (ret != LTTCOMM_OK) {
2789 goto error;
2790 }
2791 break;
2792 default:
2793 ret = LTTCOMM_UST_ENABLE_FAIL;
2794 goto error;
2795 }
2796
2797 /* Manage return value */
2798 if (ret != LTTCOMM_OK) {
2799 goto error;
2800 }
2801
2802 break;
2803 }
2804 case LTTNG_DOMAIN_UST_EXEC_NAME:
2805 case LTTNG_DOMAIN_UST_PID:
2806 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2807 default:
54d01ffb
DG
2808 ret = LTTCOMM_NOT_IMPLEMENTED;
2809 goto error;
d36b8583 2810 }
f3ed775e 2811
54d01ffb
DG
2812 ret = LTTCOMM_OK;
2813
2814error:
2815 return ret;
2816}
2817
2818/*
2819 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2820 */
2821static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2822{
2823 int ret;
2824 ssize_t nb_events = 0;
2825
2826 switch (domain) {
2827 case LTTNG_DOMAIN_KERNEL:
2828 nb_events = kernel_list_events(kernel_tracer_fd, events);
2829 if (nb_events < 0) {
2830 ret = LTTCOMM_KERN_LIST_FAIL;
2831 goto error;
894be886 2832 }
54d01ffb 2833 break;
b551a063
DG
2834 case LTTNG_DOMAIN_UST:
2835 nb_events = ust_app_list_events(events);
2836 if (nb_events < 0) {
2837 ret = LTTCOMM_UST_LIST_FAIL;
2838 goto error;
2839 }
2840 break;
54d01ffb 2841 default:
54d01ffb
DG
2842 ret = LTTCOMM_NOT_IMPLEMENTED;
2843 goto error;
2844 }
894be886 2845
54d01ffb 2846 return nb_events;
7d29a247 2847
54d01ffb
DG
2848error:
2849 /* Return negative value to differentiate return code */
2850 return -ret;
2851}
b389abbe 2852
54d01ffb
DG
2853/*
2854 * Command LTTNG_START_TRACE processed by the client thread.
2855 */
2856static int cmd_start_trace(struct ltt_session *session)
2857{
2858 int ret;
54d01ffb 2859 struct ltt_kernel_session *ksession;
b9d9b220 2860 struct ltt_ust_session *usess;
b389abbe 2861
54d01ffb
DG
2862 /* Short cut */
2863 ksession = session->kernel_session;
b9d9b220 2864 usess = session->ust_session;
5eb91c98 2865
464dd62d
MD
2866 if (session->enabled)
2867 return LTTCOMM_UST_START_FAIL;
2868 session->enabled = 1;
2869
54d01ffb
DG
2870 /* Kernel tracing */
2871 if (ksession != NULL) {
2bdd86d4
MD
2872 struct ltt_kernel_channel *kchan;
2873
54d01ffb
DG
2874 /* Open kernel metadata */
2875 if (ksession->metadata == NULL) {
2876 ret = kernel_open_metadata(ksession, ksession->trace_path);
2877 if (ret < 0) {
2878 ret = LTTCOMM_KERN_META_FAIL;
2879 goto error;
b389abbe 2880 }
54d01ffb 2881 }
7d29a247 2882
54d01ffb
DG
2883 /* Open kernel metadata stream */
2884 if (ksession->metadata_stream_fd == 0) {
2885 ret = kernel_open_metadata_stream(ksession);
2886 if (ret < 0) {
2887 ERR("Kernel create metadata stream failed");
2888 ret = LTTCOMM_KERN_STREAM_FAIL;
2889 goto error;
2890 }
2891 }
2892
2893 /* For each channel */
2894 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2895 if (kchan->stream_count == 0) {
2896 ret = kernel_open_channel_stream(kchan);
2897 if (ret < 0) {
2898 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2899 goto error;
2900 }
54d01ffb
DG
2901 /* Update the stream global counter */
2902 ksession->stream_count_global += ret;
7d29a247 2903 }
54d01ffb
DG
2904 }
2905
2906 /* Setup kernel consumer socket and send fds to it */
2907 ret = init_kernel_tracing(ksession);
2908 if (ret < 0) {
2909 ret = LTTCOMM_KERN_START_FAIL;
2910 goto error;
2911 }
2912
2913 /* This start the kernel tracing */
2914 ret = kernel_start_session(ksession);
2915 if (ret < 0) {
2916 ret = LTTCOMM_KERN_START_FAIL;
2917 goto error;
2918 }
2919
2920 /* Quiescent wait after starting trace */
2921 kernel_wait_quiescent(kernel_tracer_fd);
2922 }
2923
36dc12cc 2924 /* Flag session that trace should start automatically */
b9d9b220
DG
2925 if (usess) {
2926 usess->start_trace = 1;
36dc12cc 2927
b9d9b220
DG
2928 ret = ust_app_start_trace_all(usess);
2929 if (ret < 0) {
2930 ret = LTTCOMM_UST_START_FAIL;
2931 goto error;
2932 }
2bdd86d4 2933 }
54d01ffb
DG
2934
2935 ret = LTTCOMM_OK;
2936
2937error:
2938 return ret;
2939}
2940
2941/*
2942 * Command LTTNG_STOP_TRACE processed by the client thread.
2943 */
2944static int cmd_stop_trace(struct ltt_session *session)
2945{
2946 int ret;
2947 struct ltt_kernel_channel *kchan;
2948 struct ltt_kernel_session *ksession;
8be98f9a 2949 struct ltt_ust_session *usess;
54d01ffb
DG
2950
2951 /* Short cut */
2952 ksession = session->kernel_session;
8be98f9a 2953 usess = session->ust_session;
54d01ffb 2954
464dd62d
MD
2955 if (!session->enabled)
2956 return LTTCOMM_UST_START_FAIL;
2957 session->enabled = 0;
2958
54d01ffb
DG
2959 /* Kernel tracer */
2960 if (ksession != NULL) {
2961 DBG("Stop kernel tracing");
2962
2963 /* Flush all buffers before stopping */
2964 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2965 if (ret < 0) {
2966 ERR("Kernel metadata flush failed");
2967 }
f34daff7 2968
54d01ffb
DG
2969 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2970 ret = kernel_flush_buffer(kchan);
0d0c377a 2971 if (ret < 0) {
54d01ffb 2972 ERR("Kernel flush buffer error");
7d29a247 2973 }
54d01ffb 2974 }
19e70852 2975
54d01ffb
DG
2976 ret = kernel_stop_session(ksession);
2977 if (ret < 0) {
2978 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2979 goto error;
f3ed775e 2980 }
54d01ffb
DG
2981
2982 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2983 }
54d01ffb 2984
8be98f9a
MD
2985 if (usess) {
2986 usess->start_trace = 0;
2bdd86d4 2987
8be98f9a 2988 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2989 if (ret < 0) {
8be98f9a 2990 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2991 goto error;
2992 }
2bdd86d4 2993 }
54d01ffb
DG
2994
2995 ret = LTTCOMM_OK;
2996
2997error:
2998 return ret;
2999}
3000
3001/*
3002 * Command LTTNG_CREATE_SESSION processed by the client thread.
3003 */
3004static int cmd_create_session(char *name, char *path)
3005{
3006 int ret;
3007
3008 ret = session_create(name, path);
3009 if (ret != LTTCOMM_OK) {
3010 goto error;
3011 }
3012
3013 ret = LTTCOMM_OK;
3014
3015error:
3016 return ret;
3017}
3018
3019/*
3020 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3021 */
3022static int cmd_destroy_session(struct ltt_session *session, char *name)
3023{
3024 int ret;
3025
3026 /* Clean kernel session teardown */
3027 teardown_kernel_session(session);
84cd17c6
MD
3028 /* UST session teardown */
3029 teardown_ust_session(session);
54d01ffb
DG
3030
3031 /*
3032 * Must notify the kernel thread here to update it's poll setin order
3033 * to remove the channel(s)' fd just destroyed.
3034 */
3035 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3036 if (ret < 0) {
3037 perror("write kernel poll pipe");
3038 }
3039
271933a4 3040 ret = session_destroy(session);
54d01ffb
DG
3041
3042 return ret;
3043}
3044
3045/*
3046 * Command LTTNG_CALIBRATE processed by the client thread.
3047 */
3048static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3049{
3050 int ret;
3051
3052 switch (domain) {
3053 case LTTNG_DOMAIN_KERNEL:
33a2b854 3054 {
54d01ffb 3055 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3056
54d01ffb
DG
3057 kcalibrate.type = calibrate->type;
3058 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3059 if (ret < 0) {
54d01ffb
DG
3060 ret = LTTCOMM_KERN_ENABLE_FAIL;
3061 goto error;
33a2b854 3062 }
54d01ffb
DG
3063 break;
3064 }
3065 default:
3066 /* TODO: Userspace tracing */
3067 ret = LTTCOMM_NOT_IMPLEMENTED;
3068 goto error;
3069 }
33a2b854 3070
54d01ffb 3071 ret = LTTCOMM_OK;
33a2b854 3072
54d01ffb
DG
3073error:
3074 return ret;
3075}
7d29a247 3076
54d01ffb
DG
3077/*
3078 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3079 */
3080static int cmd_register_consumer(struct ltt_session *session, int domain,
3081 char *sock_path)
3082{
3083 int ret, sock;
b389abbe 3084
54d01ffb
DG
3085 switch (domain) {
3086 case LTTNG_DOMAIN_KERNEL:
3087 /* Can't register a consumer if there is already one */
3088 if (session->kernel_session->consumer_fd != 0) {
3089 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3090 goto error;
3091 }
3092
3093 sock = lttcomm_connect_unix_sock(sock_path);
3094 if (sock < 0) {
3095 ret = LTTCOMM_CONNECT_FAIL;
3096 goto error;
3097 }
3098
3099 session->kernel_session->consumer_fd = sock;
3100 break;
3101 default:
3102 /* TODO: Userspace tracing */
3103 ret = LTTCOMM_NOT_IMPLEMENTED;
3104 goto error;
3105 }
3106
3107 ret = LTTCOMM_OK;
3108
3109error:
3110 return ret;
3111}
3112
3113/*
3114 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3115 */
3116static ssize_t cmd_list_domains(struct ltt_session *session,
3117 struct lttng_domain **domains)
3118{
b551a063 3119 int ret, index = 0;
54d01ffb
DG
3120 ssize_t nb_dom = 0;
3121
3122 if (session->kernel_session != NULL) {
b551a063 3123 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3124 nb_dom++;
3125 }
3126
b551a063
DG
3127 if (session->ust_session != NULL) {
3128 DBG3("Listing domains found UST global domain");
3129 nb_dom++;
3130 }
54d01ffb 3131
b551a063 3132 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3133 if (*domains == NULL) {
3134 ret = -LTTCOMM_FATAL;
3135 goto error;
3136 }
3137
b551a063
DG
3138 if (session->kernel_session != NULL) {
3139 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3140 index++;
3141 }
3142
3143 if (session->ust_session != NULL) {
3144 (*domains)[index].type = LTTNG_DOMAIN_UST;
3145 index++;
3146 }
54d01ffb 3147
54d01ffb
DG
3148 return nb_dom;
3149
3150error:
3151 return ret;
3152}
3153
3154/*
3155 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3156 */
b551a063 3157static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3158 struct lttng_channel **channels)
3159{
3160 int ret;
3161 ssize_t nb_chan = 0;
3162
b551a063
DG
3163 switch (domain) {
3164 case LTTNG_DOMAIN_KERNEL:
3165 if (session->kernel_session != NULL) {
3166 nb_chan = session->kernel_session->channel_count;
3167 }
0df502fd 3168 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3169 break;
3170 case LTTNG_DOMAIN_UST:
3171 if (session->ust_session != NULL) {
3172 nb_chan = hashtable_get_count(
3173 session->ust_session->domain_global.channels);
3174 }
0df502fd 3175 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3176 break;
3177 default:
3178 *channels = NULL;
3179 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3180 goto error;
3181 }
3182
b551a063
DG
3183 if (nb_chan > 0) {
3184 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3185 if (*channels == NULL) {
3186 ret = -LTTCOMM_FATAL;
3187 goto error;
3188 }
54d01ffb 3189
b551a063
DG
3190 list_lttng_channels(domain, session, *channels);
3191 } else {
3192 *channels = NULL;
3193 }
2bdd86d4 3194
54d01ffb
DG
3195 return nb_chan;
3196
3197error:
3198 return ret;
3199}
3200
3201/*
3202 * Command LTTNG_LIST_EVENTS processed by the client thread.
3203 */
b551a063 3204static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3205 char *channel_name, struct lttng_event **events)
3206{
b551a063 3207 int ret = 0;
54d01ffb 3208 ssize_t nb_event = 0;
54d01ffb 3209
b551a063
DG
3210 switch (domain) {
3211 case LTTNG_DOMAIN_KERNEL:
3212 if (session->kernel_session != NULL) {
3213 nb_event = list_lttng_kernel_events(channel_name,
3214 session->kernel_session, events);
54d01ffb 3215 }
b551a063
DG
3216 break;
3217 case LTTNG_DOMAIN_UST:
3218 {
3219 if (session->ust_session != NULL) {
3220 nb_event = list_lttng_ust_global_events(channel_name,
3221 &session->ust_session->domain_global, events);
3222 }
3223 break;
54d01ffb 3224 }
b551a063
DG
3225 default:
3226 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3227 goto error;
3228 }
3229
b551a063 3230 ret = nb_event;
54d01ffb
DG
3231
3232error:
3233 return ret;
3234}
3235
3236/*
3237 * Process the command requested by the lttng client within the command
3238 * context structure. This function make sure that the return structure (llm)
3239 * is set and ready for transmission before returning.
3240 *
3241 * Return any error encountered or 0 for success.
3242 */
3243static int process_client_msg(struct command_ctx *cmd_ctx)
3244{
3245 int ret = LTTCOMM_OK;
44d3bd01 3246 int need_tracing_session = 1;
54d01ffb
DG
3247
3248 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3249
3250 /*
3251 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3252 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3253 * command.
3254 */
3255 switch(cmd_ctx->lsm->cmd_type) {
3256 case LTTNG_LIST_SESSIONS:
3257 case LTTNG_LIST_TRACEPOINTS:
3258 case LTTNG_LIST_DOMAINS:
3259 case LTTNG_LIST_CHANNELS:
3260 case LTTNG_LIST_EVENTS:
3261 break;
3262 default:
3263 /* Setup lttng message with no payload */
3264 ret = setup_lttng_msg(cmd_ctx, 0);
3265 if (ret < 0) {
3266 /* This label does not try to unlock the session */
3267 goto init_setup_error;
3268 }
3269 }
3270
3271 /* Commands that DO NOT need a session. */
3272 switch (cmd_ctx->lsm->cmd_type) {
3273 case LTTNG_CALIBRATE:
3274 case LTTNG_CREATE_SESSION:
3275 case LTTNG_LIST_SESSIONS:
3276 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3277 need_tracing_session = 0;
54d01ffb
DG
3278 break;
3279 default:
3280 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3281 session_lock_list();
54d01ffb 3282 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3283 session_unlock_list();
54d01ffb
DG
3284 if (cmd_ctx->session == NULL) {
3285 if (cmd_ctx->lsm->session.name != NULL) {
3286 ret = LTTCOMM_SESS_NOT_FOUND;
3287 } else {
3288 /* If no session name specified */
3289 ret = LTTCOMM_SELECT_SESS;
3290 }
3291 goto error;
3292 } else {
3293 /* Acquire lock for the session */
3294 session_lock(cmd_ctx->session);
3295 }
3296 break;
3297 }
b389abbe 3298
54d01ffb
DG
3299 /*
3300 * Check domain type for specific "pre-action".
3301 */
3302 switch (cmd_ctx->lsm->domain.type) {
3303 case LTTNG_DOMAIN_KERNEL:
3304 /* Kernel tracer check */
3305 if (kernel_tracer_fd == 0) {
3306 /* Basically, load kernel tracer modules */
3307 init_kernel_tracer();
3308 if (kernel_tracer_fd == 0) {
3309 ret = LTTCOMM_KERN_NA;
3310 goto error;
3311 }
3312 }
5eb91c98 3313
54d01ffb 3314 /* Need a session for kernel command */
44d3bd01 3315 if (need_tracing_session) {
54d01ffb
DG
3316 if (cmd_ctx->session->kernel_session == NULL) {
3317 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3318 if (ret < 0) {
54d01ffb 3319 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3320 goto error;
3321 }
b389abbe 3322 }
7d29a247 3323
54d01ffb 3324 /* Start the kernel consumer daemon */
3bd1e081
MD
3325 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3326 if (kconsumer_data.pid == 0 &&
54d01ffb 3327 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3328 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3329 ret = start_consumerd(&kconsumer_data);
7d29a247 3330 if (ret < 0) {
54d01ffb
DG
3331 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3332 goto error;
950131af 3333 }
3ff2ecac
MD
3334 } else {
3335 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3336 }
0d0c377a 3337 }
54d01ffb 3338 break;
2bdd86d4 3339 case LTTNG_DOMAIN_UST:
44d3bd01 3340 {
44d3bd01 3341 if (need_tracing_session) {
f6a9efaa 3342 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3343 ret = create_ust_session(cmd_ctx->session,
3344 &cmd_ctx->lsm->domain);
3345 if (ret != LTTCOMM_OK) {
3346 goto error;
3347 }
3348 }
7753dea8
MD
3349 /* Start the UST consumer daemons */
3350 /* 64-bit */
3351 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3352 if (consumerd64_bin[0] != '\0' &&
7753dea8 3353 ustconsumer64_data.pid == 0 &&
2bdd86d4 3354 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3355 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3356 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3357 if (ret < 0) {
7753dea8
MD
3358 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3359 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
3360 goto error;
3361 }