Fix code syntax
[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>
bec39940 42#include <lttng-ht.h>
e88129fc 43#include <lttng-sessiond-comm.h>
3bd1e081 44#include <lttng/lttng-consumer.h>
2bdd86d4 45
1e307fab 46#include <lttngerr.h>
0857097f 47#include "common/runas.h"
fac6795d 48
54d01ffb 49#include "channel.h"
5eb91c98 50#include "compat/poll.h"
099e26bd 51#include "context.h"
54d01ffb 52#include "event.h"
099e26bd 53#include "futex.h"
4771f025 54#include "kernel.h"
32258573 55#include "lttng-sessiond.h"
0fdd1e2c 56#include "shm.h"
56fff090 57#include "ust-app.h"
1e307fab 58#include "ust-ctl.h"
8e68d1c8 59#include "utils.h"
fac6795d 60
ebaeda94
MD
61#define CONSUMERD_FILE "lttng-consumerd"
62
3bd1e081
MD
63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
80
75462a81 81/* Const values */
686204ab 82const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 83const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
84const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
fac6795d 87/* Variables */
1d4b027a 88int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 89int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 90int opt_quiet; /* Not static for lttngerr.h */
d063d709 91
fac6795d
DG
92const char *progname;
93const char *opt_tracing_group;
5b8719f5 94static int opt_sig_parent;
fac6795d 95static int opt_daemon;
4fba7219 96static int opt_no_kernel;
fac6795d 97static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 98static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 99static char *rundir;
3bd1e081
MD
100
101/* Consumer daemon specific control data */
102static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
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MD
104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 106};
7753dea8
MD
107static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111};
112static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
116};
117
099e26bd 118static int dispatch_thread_exit;
fac6795d 119
54d01ffb
DG
120/* Global application Unix socket path */
121static char apps_unix_sock_path[PATH_MAX];
122/* Global client Unix socket path */
123static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
124/* global wait shm path for UST */
125static char wait_shm_path[PATH_MAX];
fac6795d 126
1d4b027a 127/* Sockets and FDs */
d6f42150
DG
128static int client_sock;
129static int apps_sock;
20fe2104 130static int kernel_tracer_fd;
7a485870 131static int kernel_poll_pipe[2];
1d4b027a 132
273ea72c
DG
133/*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137static int thread_quit_pipe[2];
138
099e26bd
DG
139/*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143static int apps_cmd_pipe[2];
144
1d4b027a 145/* Pthread, Mutexes and Semaphores */
1d4b027a 146static pthread_t apps_thread;
099e26bd 147static pthread_t reg_apps_thread;
1d4b027a 148static pthread_t client_thread;
7a485870 149static pthread_t kernel_thread;
099e26bd 150static pthread_t dispatch_thread;
5eb91c98 151
fac6795d 152
099e26bd
DG
153/*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160static struct ust_cmd_queue ust_cmd_queue;
161
b5541356
DG
162/*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
04ea676f 168 *
d063d709 169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 170 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
171 */
172static struct ltt_session_list *session_list_ptr;
173
7753dea8
MD
174int ust_consumerd64_fd = -1;
175int ust_consumerd32_fd = -1;
176
fb6f1fa2
YB
177static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
178static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
179static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
180static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD
181
182static
7753dea8 183void setup_consumerd_path(void)
fb09408a 184{
fc7a59ce 185 const char *bin, *libdir;
fb09408a 186
7753dea8
MD
187 /*
188 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
189 * native architecture size consumer if CONFIG_CONSUMER*_PATH
190 * has not been defined.
7753dea8 191 */
ebaeda94 192#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
193 if (!consumerd32_bin[0]) {
194 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
195 }
196 if (!consumerd32_libdir[0]) {
197 consumerd32_libdir = INSTALL_LIB_PATH;
198 }
199#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
200 if (!consumerd64_bin[0]) {
201 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 202 }
ebaeda94
MD
203 if (!consumerd64_libdir[0]) {
204 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
205 }
206#else
207#error "Unknown bitness"
208#endif
209
fb09408a
MD
210 /*
211 * runtime env. var. overrides the build default.
212 */
fc7a59ce
AM
213 bin = getenv("LTTNG_CONSUMERD32_BIN");
214 if (bin) {
215 consumerd32_bin = bin;
7753dea8 216 }
fc7a59ce
AM
217 bin = getenv("LTTNG_CONSUMERD64_BIN");
218 if (bin) {
219 consumerd64_bin = bin;
ebaeda94
MD
220 }
221 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
222 if (libdir) {
223 consumerd32_libdir = libdir;
224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
226 if (libdir) {
227 consumerd64_libdir = libdir;
fb09408a
MD
228 }
229}
230
5eb91c98
DG
231/*
232 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
233 */
234static int create_thread_poll_set(struct lttng_poll_event *events,
235 unsigned int size)
236{
237 int ret;
238
239 if (events == NULL || size == 0) {
240 ret = -1;
241 goto error;
242 }
243
244 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
245 if (ret < 0) {
246 goto error;
247 }
248
249 /* Add quit pipe */
250 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
251 if (ret < 0) {
252 goto error;
253 }
254
255 return 0;
256
257error:
258 return ret;
259}
260
261/*
262 * Check if the thread quit pipe was triggered.
263 *
264 * Return 1 if it was triggered else 0;
265 */
266static int check_thread_quit_pipe(int fd, uint32_t events)
267{
268 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
269 return 1;
270 }
271
272 return 0;
273}
274
0fdd1e2c
DG
275/*
276 * Remove modules in reverse load order.
277 */
278static int modprobe_remove_kernel_modules(void)
279{
280 int ret = 0, i;
281 char modprobe[256];
282
283 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
284 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 285 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
286 kernel_modules_list[i].name);
287 if (ret < 0) {
24b487b8 288 perror("snprintf modprobe -r");
0fdd1e2c
DG
289 goto error;
290 }
291 modprobe[sizeof(modprobe) - 1] = '\0';
292 ret = system(modprobe);
293 if (ret == -1) {
24b487b8 294 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
295 kernel_modules_list[i].name);
296 } else if (kernel_modules_list[i].required
297 && WEXITSTATUS(ret) != 0) {
298 ERR("Unable to remove module %s",
299 kernel_modules_list[i].name);
300 } else {
301 DBG("Modprobe removal successful %s",
302 kernel_modules_list[i].name);
303 }
304 }
305
306error:
307 return ret;
308}
309
310/*
311 * Return group ID of the tracing group or -1 if not found.
312 */
996b65c8
MD
313static gid_t allowed_group(void)
314{
315 struct group *grp;
316
274e143b
MD
317 if (opt_tracing_group) {
318 grp = getgrnam(opt_tracing_group);
319 } else {
320 grp = getgrnam(default_tracing_group);
321 }
996b65c8
MD
322 if (!grp) {
323 return -1;
324 } else {
325 return grp->gr_gid;
326 }
327}
328
273ea72c 329/*
5eb91c98 330 * Init thread quit pipe.
273ea72c
DG
331 *
332 * Return -1 on error or 0 if all pipes are created.
333 */
334static int init_thread_quit_pipe(void)
335{
336 int ret;
337
338 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
339 if (ret < 0) {
340 perror("thread quit pipe");
341 goto error;
342 }
343
344error:
345 return ret;
346}
347
fac6795d 348/*
d063d709
DG
349 * Complete teardown of a kernel session. This free all data structure related
350 * to a kernel session and update counter.
fac6795d 351 */
1d4b027a 352static void teardown_kernel_session(struct ltt_session *session)
fac6795d 353{
8f7a84dd
DG
354 if (!session->kernel_session) {
355 DBG3("No kernel session when tearingdown session");
84ea9c99 356 return;
8f7a84dd
DG
357 }
358
84ea9c99 359 DBG("Tearing down kernel session");
d9800920 360
84ea9c99
MD
361 /*
362 * If a custom kernel consumer was registered, close the socket before
363 * tearing down the complete kernel session structure
364 */
365 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
366 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 367 }
84ea9c99
MD
368
369 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
370}
371
f6a9efaa
DG
372/*
373 * Complete teardown of all UST sessions. This will free everything on his path
374 * and destroy the core essence of all ust sessions :)
375 */
376static void teardown_ust_session(struct ltt_session *session)
377{
84cd17c6
MD
378 int ret;
379
8f7a84dd
DG
380 if (!session->ust_session) {
381 DBG3("No UST session when tearingdown session");
f470a390 382 return;
8f7a84dd
DG
383 }
384
84ea9c99 385 DBG("Tearing down UST session(s)");
8f7a84dd 386
84cd17c6
MD
387 ret = ust_app_destroy_trace_all(session->ust_session);
388 if (ret) {
389 ERR("Error in ust_app_destroy_trace_all");
390 }
8f7a84dd 391
f6a9efaa
DG
392 trace_ust_destroy_session(session->ust_session);
393}
394
099e26bd
DG
395/*
396 * Stop all threads by closing the thread quit pipe.
397 */
cf3af59e
MD
398static void stop_threads(void)
399{
5eb91c98
DG
400 int ret;
401
cf3af59e
MD
402 /* Stopping all threads */
403 DBG("Terminating all threads");
54d01ffb 404 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
405 if (ret < 0) {
406 ERR("write error on thread quit pipe");
407 }
408
099e26bd
DG
409 /* Dispatch thread */
410 dispatch_thread_exit = 1;
411 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
412}
413
fac6795d 414/*
d063d709 415 * Cleanup the daemon
fac6795d 416 */
cf3af59e 417static void cleanup(void)
fac6795d 418{
1d4b027a
DG
419 int ret;
420 char *cmd;
af9737e9 421 struct ltt_session *sess, *stmp;
fac6795d 422
1d4b027a 423 DBG("Cleaning up");
e07ae692 424
67e40797
DG
425 DBG("Removing %s directory", rundir);
426 ret = asprintf(&cmd, "rm -rf %s", rundir);
427 if (ret < 0) {
428 ERR("asprintf failed. Something is really wrong!");
429 }
5461b305 430
67e40797
DG
431 /* Remove lttng run directory */
432 ret = system(cmd);
433 if (ret < 0) {
434 ERR("Unable to clean %s", rundir);
1d4b027a 435 }
67e40797 436 free(cmd);
5461b305 437
1d4b027a 438 DBG("Cleaning up all session");
fac6795d 439
b5541356 440 /* Destroy session list mutex */
273ea72c
DG
441 if (session_list_ptr != NULL) {
442 pthread_mutex_destroy(&session_list_ptr->lock);
443
444 /* Cleanup ALL session */
54d01ffb
DG
445 cds_list_for_each_entry_safe(sess, stmp,
446 &session_list_ptr->head, list) {
273ea72c 447 teardown_kernel_session(sess);
f6a9efaa
DG
448 teardown_ust_session(sess);
449 free(sess);
273ea72c
DG
450 }
451 }
452
099e26bd 453 DBG("Closing all UST sockets");
56fff090 454 ust_app_clean_list();
099e26bd 455
3bd1e081 456 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 457
4fba7219
DG
458 if (is_root && !opt_no_kernel) {
459 DBG2("Closing kernel fd");
460 close(kernel_tracer_fd);
2f50c8a3
DG
461 DBG("Unloading kernel modules");
462 modprobe_remove_kernel_modules();
463 }
5eb91c98
DG
464
465 close(thread_quit_pipe[0]);
466 close(thread_quit_pipe[1]);
421cb601
DG
467
468 /* <fun> */
f56a39af 469 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
470 "Matthew, BEET driven development works!%c[%dm",
471 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
472 /* </fun> */
fac6795d
DG
473}
474
e065084a 475/*
d063d709 476 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 477 *
d063d709 478 * Return lttcomm error code.
e065084a
DG
479 */
480static int send_unix_sock(int sock, void *buf, size_t len)
481{
482 /* Check valid length */
483 if (len <= 0) {
484 return -1;
485 }
486
487 return lttcomm_send_unix_sock(sock, buf, len);
488}
489
5461b305 490/*
d063d709 491 * Free memory of a command context structure.
5461b305 492 */
a2fb29a5 493static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 494{
a2fb29a5
DG
495 DBG("Clean command context structure");
496 if (*cmd_ctx) {
497 if ((*cmd_ctx)->llm) {
498 free((*cmd_ctx)->llm);
5461b305 499 }
a2fb29a5
DG
500 if ((*cmd_ctx)->lsm) {
501 free((*cmd_ctx)->lsm);
5461b305 502 }
a2fb29a5
DG
503 free(*cmd_ctx);
504 *cmd_ctx = NULL;
5461b305
DG
505 }
506}
507
f3ed775e 508/*
d063d709 509 * Send all stream fds of kernel channel to the consumer.
f3ed775e 510 */
2bdd86d4 511static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
512 int sock, struct ltt_kernel_channel *channel,
513 uid_t uid, gid_t gid)
f3ed775e
DG
514{
515 int ret;
f3ed775e 516 struct ltt_kernel_stream *stream;
3bd1e081 517 struct lttcomm_consumer_msg lkm;
f3ed775e 518
3bd1e081 519 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 520 channel->channel->name);
f3ed775e 521
3bd1e081
MD
522 /* Send channel */
523 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
524 lkm.u.channel.channel_key = channel->fd;
525 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
526 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 527 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 528 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 529 if (ret < 0) {
3bd1e081 530 perror("send consumer channel");
f3ed775e
DG
531 goto error;
532 }
533
3bd1e081 534 /* Send streams */
7a485870 535 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
536 if (!stream->fd) {
537 continue;
538 }
539 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
540 lkm.u.stream.channel_key = channel->fd;
541 lkm.u.stream.stream_key = stream->fd;
542 lkm.u.stream.state = stream->state;
543 lkm.u.stream.output = channel->channel->attr.output;
544 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
545 lkm.u.stream.uid = uid;
546 lkm.u.stream.gid = gid;
3bd1e081
MD
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 */
6df2e2c9
MD
608 lkm.u.stream.uid = session->uid;
609 lkm.u.stream.gid = session->gid;
3bd1e081
MD
610 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
611 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
612 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
613 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
614 if (ret < 0) {
615 perror("send consumer stream");
616 goto error;
617 }
618 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 619 if (ret < 0) {
3bd1e081 620 perror("send consumer stream");
7a485870
DG
621 goto error;
622 }
623 }
f3ed775e 624
f3ed775e 625 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
626 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
627 session->uid, session->gid);
2bdd86d4
MD
628 if (ret < 0) {
629 goto error;
630 }
631 }
632
633 DBG("consumer fds (metadata and channel streams) sent");
634
635 return 0;
636
637error:
638 return ret;
639}
640
fac6795d 641/*
0fdd1e2c 642 * Notify UST applications using the shm mmap futex.
fac6795d 643 */
0fdd1e2c 644static int notify_ust_apps(int active)
fac6795d 645{
0fdd1e2c 646 char *wait_shm_mmap;
fac6795d 647
0fdd1e2c 648 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 649
0fdd1e2c
DG
650 /* See shm.c for this call implying mmap, shm and futex calls */
651 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
652 if (wait_shm_mmap == NULL) {
fac6795d
DG
653 goto error;
654 }
655
0fdd1e2c
DG
656 /* Wake waiting process */
657 futex_wait_update((int32_t *) wait_shm_mmap, active);
658
659 /* Apps notified successfully */
660 return 0;
fac6795d
DG
661
662error:
0fdd1e2c 663 return -1;
fac6795d
DG
664}
665
e065084a 666/*
d063d709
DG
667 * Setup the outgoing data buffer for the response (llm) by allocating the
668 * right amount of memory and copying the original information from the lsm
669 * structure.
ca95a216 670 *
d063d709 671 * Return total size of the buffer pointed by buf.
ca95a216 672 */
5461b305 673static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 674{
f3ed775e 675 int ret, buf_size;
ca95a216 676
f3ed775e 677 buf_size = size;
5461b305 678
ba7f0ae5 679 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 680 if (cmd_ctx->llm == NULL) {
ba7f0ae5 681 perror("zmalloc");
5461b305 682 ret = -ENOMEM;
ca95a216
DG
683 goto error;
684 }
685
5461b305
DG
686 /* Copy common data */
687 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 688 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 689
5461b305
DG
690 cmd_ctx->llm->data_size = size;
691 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
692
ca95a216
DG
693 return buf_size;
694
695error:
696 return ret;
697}
698
7a485870 699/*
5eb91c98 700 * Update the kernel poll set of all channel fd available over all tracing
d063d709 701 * session. Add the wakeup pipe at the end of the set.
7a485870 702 */
5eb91c98 703static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 704{
5eb91c98 705 int ret;
7a485870
DG
706 struct ltt_session *session;
707 struct ltt_kernel_channel *channel;
708
5eb91c98 709 DBG("Updating kernel poll set");
7a485870 710
54d01ffb 711 session_lock_list();
b5541356 712 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 713 session_lock(session);
7a485870 714 if (session->kernel_session == NULL) {
54d01ffb 715 session_unlock(session);
7a485870
DG
716 continue;
717 }
7a485870 718
54d01ffb
DG
719 cds_list_for_each_entry(channel,
720 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
721 /* Add channel fd to the kernel poll set */
722 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
723 if (ret < 0) {
54d01ffb 724 session_unlock(session);
5eb91c98
DG
725 goto error;
726 }
727 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 728 }
54d01ffb 729 session_unlock(session);
7a485870 730 }
54d01ffb 731 session_unlock_list();
7a485870 732
5eb91c98 733 return 0;
7a485870
DG
734
735error:
54d01ffb 736 session_unlock_list();
7a485870
DG
737 return -1;
738}
739
740/*
54d01ffb 741 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 742 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 743 *
d063d709 744 * Useful for CPU hotplug feature.
7a485870 745 */
2bdd86d4 746static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
747{
748 int ret = 0;
749 struct ltt_session *session;
750 struct ltt_kernel_channel *channel;
751
752 DBG("Updating kernel streams for channel fd %d", fd);
753
54d01ffb 754 session_lock_list();
b5541356 755 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 756 session_lock(session);
7a485870 757 if (session->kernel_session == NULL) {
54d01ffb 758 session_unlock(session);
7a485870
DG
759 continue;
760 }
d9800920
DG
761
762 /* This is not suppose to be 0 but this is an extra security check */
763 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 764 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
765 }
766
5eb91c98
DG
767 cds_list_for_each_entry(channel,
768 &session->kernel_session->channel_list.head, list) {
7a485870
DG
769 if (channel->fd == fd) {
770 DBG("Channel found, updating kernel streams");
771 ret = kernel_open_channel_stream(channel);
772 if (ret < 0) {
b3c750d2 773 goto error;
7a485870 774 }
d9800920 775
7a485870 776 /*
5eb91c98
DG
777 * Have we already sent fds to the consumer? If yes, it means
778 * that tracing is started so it is safe to send our updated
779 * stream fds.
7a485870 780 */
3bd1e081 781 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 782 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
783 session->kernel_session->consumer_fd, channel,
784 session->uid, session->gid);
7a485870 785 if (ret < 0) {
b3c750d2 786 goto error;
7a485870
DG
787 }
788 }
b3c750d2 789 goto error;
7a485870
DG
790 }
791 }
54d01ffb 792 session_unlock(session);
7a485870 793 }
54d01ffb 794 session_unlock_list();
b3c750d2 795 return ret;
7a485870 796
b3c750d2 797error:
54d01ffb
DG
798 session_unlock(session);
799 session_unlock_list();
7a485870
DG
800 return ret;
801}
802
487cf67c
DG
803/*
804 * For each tracing session, update newly registered apps.
805 */
806static void update_ust_app(int app_sock)
807{
808 struct ltt_session *sess, *stmp;
809
810 /* For all tracing session(s) */
811 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
812 if (sess->ust_session) {
813 ust_app_global_update(sess->ust_session, app_sock);
814 }
487cf67c
DG
815 }
816}
817
7a485870 818/*
d063d709 819 * This thread manage event coming from the kernel.
7a485870 820 *
d063d709
DG
821 * Features supported in this thread:
822 * -) CPU Hotplug
7a485870
DG
823 */
824static void *thread_manage_kernel(void *data)
825{
5eb91c98
DG
826 int ret, i, pollfd, update_poll_flag = 1;
827 uint32_t revents, nb_fd;
7a485870 828 char tmp;
5eb91c98 829 struct lttng_poll_event events;
7a485870
DG
830
831 DBG("Thread manage kernel started");
832
5eb91c98
DG
833 ret = create_thread_poll_set(&events, 2);
834 if (ret < 0) {
835 goto error;
836 }
837
838 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
839 if (ret < 0) {
840 goto error;
841 }
842
7a485870
DG
843 while (1) {
844 if (update_poll_flag == 1) {
5f822d0a
DG
845 /*
846 * Reset number of fd in the poll set. Always 2 since there is the thread
847 * quit pipe and the kernel pipe.
848 */
849 events.nb_fd = 2;
850
5eb91c98
DG
851 ret = update_kernel_poll(&events);
852 if (ret < 0) {
7a485870
DG
853 goto error;
854 }
855 update_poll_flag = 0;
856 }
857
5eb91c98
DG
858 nb_fd = LTTNG_POLL_GETNB(&events);
859
860 DBG("Thread kernel polling on %d fds", nb_fd);
861
862 /* Zeroed the poll events */
863 lttng_poll_reset(&events);
7a485870
DG
864
865 /* Poll infinite value of time */
5eb91c98 866 ret = lttng_poll_wait(&events, -1);
7a485870 867 if (ret < 0) {
7a485870
DG
868 goto error;
869 } else if (ret == 0) {
870 /* Should not happen since timeout is infinite */
85611738
DG
871 ERR("Return value of poll is 0 with an infinite timeout.\n"
872 "This should not have happened! Continuing...");
7a485870
DG
873 continue;
874 }
875
5eb91c98
DG
876 for (i = 0; i < nb_fd; i++) {
877 /* Fetch once the poll data */
878 revents = LTTNG_POLL_GETEV(&events, i);
879 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 880
5eb91c98
DG
881 /* Thread quit pipe has been closed. Killing thread. */
882 ret = check_thread_quit_pipe(pollfd, revents);
883 if (ret) {
884 goto error;
885 }
7a485870 886
5eb91c98
DG
887 /* Check for data on kernel pipe */
888 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
889 ret = read(kernel_poll_pipe[0], &tmp, 1);
890 update_poll_flag = 1;
891 continue;
892 } else {
893 /*
894 * New CPU detected by the kernel. Adding kernel stream to
895 * kernel session and updating the kernel consumer
896 */
897 if (revents & LPOLLIN) {
2bdd86d4 898 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
899 if (ret < 0) {
900 continue;
901 }
902 break;
903 /*
904 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
905 * and unregister kernel stream at this point.
906 */
7a485870 907 }
7a485870
DG
908 }
909 }
910 }
911
912error:
913 DBG("Kernel thread dying");
273ea72c
DG
914 close(kernel_poll_pipe[0]);
915 close(kernel_poll_pipe[1]);
5eb91c98
DG
916
917 lttng_poll_clean(&events);
918
7a485870
DG
919 return NULL;
920}
921
1d4b027a 922/*
3bd1e081 923 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 924 */
3bd1e081 925static void *thread_manage_consumer(void *data)
1d4b027a 926{
5eb91c98
DG
927 int sock = 0, i, ret, pollfd;
928 uint32_t revents, nb_fd;
1d4b027a 929 enum lttcomm_return_code code;
5eb91c98 930 struct lttng_poll_event events;
3bd1e081 931 struct consumer_data *consumer_data = data;
1d4b027a 932
3bd1e081 933 DBG("[thread] Manage consumer started");
1d4b027a 934
3bd1e081 935 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
936 if (ret < 0) {
937 goto error;
938 }
939
5eb91c98
DG
940 /*
941 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
942 * Nothing more will be added to this poll set.
943 */
944 ret = create_thread_poll_set(&events, 2);
945 if (ret < 0) {
946 goto error;
947 }
273ea72c 948
3bd1e081 949 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
950 if (ret < 0) {
951 goto error;
952 }
953
954 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
955
956 /* Inifinite blocking call, waiting for transmission */
5eb91c98 957 ret = lttng_poll_wait(&events, -1);
273ea72c 958 if (ret < 0) {
273ea72c
DG
959 goto error;
960 }
961
5eb91c98
DG
962 for (i = 0; i < nb_fd; i++) {
963 /* Fetch once the poll data */
964 revents = LTTNG_POLL_GETEV(&events, i);
965 pollfd = LTTNG_POLL_GETFD(&events, i);
966
967 /* Thread quit pipe has been closed. Killing thread. */
968 ret = check_thread_quit_pipe(pollfd, revents);
969 if (ret) {
970 goto error;
971 }
972
973 /* Event on the registration socket */
3bd1e081 974 if (pollfd == consumer_data->err_sock) {
5eb91c98 975 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 976 ERR("consumer err socket poll error");
5eb91c98
DG
977 goto error;
978 }
979 }
273ea72c
DG
980 }
981
3bd1e081 982 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
983 if (sock < 0) {
984 goto error;
985 }
986
3bd1e081 987 DBG2("Receiving code from consumer err_sock");
ee0b0061 988
712ea556 989 /* Getting status code from kconsumerd */
54d01ffb
DG
990 ret = lttcomm_recv_unix_sock(sock, &code,
991 sizeof(enum lttcomm_return_code));
1d4b027a
DG
992 if (ret <= 0) {
993 goto error;
994 }
995
3bd1e081
MD
996 if (code == CONSUMERD_COMMAND_SOCK_READY) {
997 consumer_data->cmd_sock =
998 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
999 if (consumer_data->cmd_sock < 0) {
1000 sem_post(&consumer_data->sem);
48842b30 1001 PERROR("consumer connect");
1d4b027a
DG
1002 goto error;
1003 }
1004 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1005 sem_post(&consumer_data->sem);
1006 DBG("consumer command socket ready");
1d4b027a 1007 } else {
3bd1e081 1008 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1009 lttcomm_get_readable_code(-code));
1010 goto error;
1011 }
1012
54d01ffb 1013 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1014 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1015 if (ret < 0) {
72079cae
DG
1016 goto error;
1017 }
1018
5eb91c98
DG
1019 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1020 if (ret < 0) {
72079cae 1021 goto error;
5eb91c98
DG
1022 }
1023
1024 /* Update number of fd */
1025 nb_fd = LTTNG_POLL_GETNB(&events);
1026
1027 /* Inifinite blocking call, waiting for transmission */
1028 ret = lttng_poll_wait(&events, -1);
1029 if (ret < 0) {
72079cae
DG
1030 goto error;
1031 }
1032
5eb91c98
DG
1033 for (i = 0; i < nb_fd; i++) {
1034 /* Fetch once the poll data */
1035 revents = LTTNG_POLL_GETEV(&events, i);
1036 pollfd = LTTNG_POLL_GETFD(&events, i);
1037
1038 /* Thread quit pipe has been closed. Killing thread. */
1039 ret = check_thread_quit_pipe(pollfd, revents);
1040 if (ret) {
1041 goto error;
1042 }
1043
1044 /* Event on the kconsumerd socket */
1045 if (pollfd == sock) {
1046 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1047 ERR("consumer err socket second poll error");
5eb91c98
DG
1048 goto error;
1049 }
1050 }
1051 }
1052
712ea556 1053 /* Wait for any kconsumerd error */
54d01ffb
DG
1054 ret = lttcomm_recv_unix_sock(sock, &code,
1055 sizeof(enum lttcomm_return_code));
712ea556 1056 if (ret <= 0) {
3bd1e081 1057 ERR("consumer closed the command socket");
712ea556 1058 goto error;
6f61d021 1059 }
1d4b027a 1060
3bd1e081 1061 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1062
1d4b027a 1063error:
3bd1e081
MD
1064 DBG("consumer thread dying");
1065 close(consumer_data->err_sock);
1066 close(consumer_data->cmd_sock);
5eb91c98 1067 close(sock);
273ea72c 1068
3bd1e081
MD
1069 unlink(consumer_data->err_unix_sock_path);
1070 unlink(consumer_data->cmd_unix_sock_path);
1071 consumer_data->pid = 0;
1d4b027a 1072
5eb91c98 1073 lttng_poll_clean(&events);
0177d773 1074
5eb91c98 1075 return NULL;
099e26bd
DG
1076}
1077
099e26bd
DG
1078/*
1079 * This thread manage application communication.
1d4b027a
DG
1080 */
1081static void *thread_manage_apps(void *data)
099e26bd 1082{
5eb91c98
DG
1083 int i, ret, pollfd;
1084 uint32_t revents, nb_fd;
099e26bd 1085 struct ust_command ust_cmd;
5eb91c98 1086 struct lttng_poll_event events;
099e26bd
DG
1087
1088 DBG("[thread] Manage application started");
1089
f6a9efaa
DG
1090 rcu_register_thread();
1091 rcu_thread_online();
1092
5eb91c98
DG
1093 ret = create_thread_poll_set(&events, 2);
1094 if (ret < 0) {
1095 goto error;
1096 }
099e26bd 1097
5eb91c98
DG
1098 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1099 if (ret < 0) {
1100 goto error;
1101 }
099e26bd 1102
5eb91c98
DG
1103 while (1) {
1104 /* Zeroed the events structure */
1105 lttng_poll_reset(&events);
0177d773 1106
5eb91c98 1107 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1108
1109 DBG("Apps thread polling on %d fds", nb_fd);
1110
1111 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1112 ret = lttng_poll_wait(&events, -1);
099e26bd 1113 if (ret < 0) {
099e26bd
DG
1114 goto error;
1115 }
1116
5eb91c98
DG
1117 for (i = 0; i < nb_fd; i++) {
1118 /* Fetch once the poll data */
1119 revents = LTTNG_POLL_GETEV(&events, i);
1120 pollfd = LTTNG_POLL_GETFD(&events, i);
1121
1122 /* Thread quit pipe has been closed. Killing thread. */
1123 ret = check_thread_quit_pipe(pollfd, revents);
1124 if (ret) {
099e26bd 1125 goto error;
5eb91c98 1126 }
099e26bd 1127
5eb91c98
DG
1128 /* Inspect the apps cmd pipe */
1129 if (pollfd == apps_cmd_pipe[0]) {
1130 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1131 ERR("Apps command pipe error");
0177d773 1132 goto error;
5eb91c98
DG
1133 } else if (revents & LPOLLIN) {
1134 /* Empty pipe */
1135 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1136 if (ret < 0 || ret < sizeof(ust_cmd)) {
1137 perror("read apps cmd pipe");
1138 goto error;
1139 }
099e26bd 1140
5eb91c98 1141 /* Register applicaton to the session daemon */
56fff090 1142 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1143 ust_cmd.sock);
88ff5b7f 1144 if (ret == -ENOMEM) {
5eb91c98 1145 goto error;
88ff5b7f
MD
1146 } else if (ret < 0) {
1147 break;
5eb91c98
DG
1148 }
1149
acc7b41b
MD
1150 /*
1151 * Add channel(s) and event(s) to newly registered apps
1152 * from lttng global UST domain.
1153 */
1154 update_ust_app(ust_cmd.sock);
1155
f2ca2e25 1156 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1157 if (ret < 0) {
1158 /*
1159 * If the registration is not possible, we simply
1160 * unregister the apps and continue
1161 */
56fff090 1162 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1163 } else {
1164 /*
1165 * We just need here to monitor the close of the UST
1166 * socket and poll set monitor those by default.
1167 */
1168 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1169 if (ret < 0) {
1170 goto error;
1171 }
1172
54d01ffb
DG
1173 DBG("Apps with sock %d added to poll set",
1174 ust_cmd.sock);
5eb91c98 1175 }
487cf67c 1176
5eb91c98 1177 break;
0177d773 1178 }
5eb91c98
DG
1179 } else {
1180 /*
54d01ffb
DG
1181 * At this point, we know that a registered application made
1182 * the event at poll_wait.
5eb91c98
DG
1183 */
1184 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1185 /* Removing from the poll set */
1186 ret = lttng_poll_del(&events, pollfd);
1187 if (ret < 0) {
1188 goto error;
1189 }
099e26bd 1190
b9d9b220 1191 /* Socket closed on remote end. */
56fff090 1192 ust_app_unregister(pollfd);
5eb91c98
DG
1193 break;
1194 }
099e26bd
DG
1195 }
1196 }
099e26bd
DG
1197 }
1198
1199error:
1200 DBG("Application communication apps dying");
1201 close(apps_cmd_pipe[0]);
1202 close(apps_cmd_pipe[1]);
1203
5eb91c98 1204 lttng_poll_clean(&events);
099e26bd 1205
f6a9efaa
DG
1206 rcu_thread_offline();
1207 rcu_unregister_thread();
099e26bd
DG
1208 return NULL;
1209}
1210
1211/*
1212 * Dispatch request from the registration threads to the application
1213 * communication thread.
1214 */
1215static void *thread_dispatch_ust_registration(void *data)
1216{
1217 int ret;
1218 struct cds_wfq_node *node;
1219 struct ust_command *ust_cmd = NULL;
1220
1221 DBG("[thread] Dispatch UST command started");
1222
1223 while (!dispatch_thread_exit) {
1224 /* Atomically prepare the queue futex */
1225 futex_nto1_prepare(&ust_cmd_queue.futex);
1226
1227 do {
1228 /* Dequeue command for registration */
1229 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1230 if (node == NULL) {
00a17c97 1231 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1232 /* Continue thread execution */
1233 break;
1234 }
1235
1236 ust_cmd = caa_container_of(node, struct ust_command, node);
1237
2f50c8a3
DG
1238 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1239 " gid:%d sock:%d name:%s (version %d.%d)",
1240 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1241 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1242 ust_cmd->sock, ust_cmd->reg_msg.name,
1243 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1244 /*
1245 * Inform apps thread of the new application registration. This
1246 * call is blocking so we can be assured that the data will be read
1247 * at some point in time or wait to the end of the world :)
1248 */
1249 ret = write(apps_cmd_pipe[1], ust_cmd,
1250 sizeof(struct ust_command));
1251 if (ret < 0) {
1252 perror("write apps cmd pipe");
1253 if (errno == EBADF) {
1254 /*
1255 * We can't inform the application thread to process
1256 * registration. We will exit or else application
1257 * registration will not occur and tracing will never
1258 * start.
1259 */
1260 goto error;
1261 }
1262 }
1263 free(ust_cmd);
1264 } while (node != NULL);
1265
1266 /* Futex wait on queue. Blocking call on futex() */
1267 futex_nto1_wait(&ust_cmd_queue.futex);
1268 }
1269
1270error:
1271 DBG("Dispatch thread dying");
1272 return NULL;
1273}
1274
1275/*
1276 * This thread manage application registration.
1277 */
1278static void *thread_registration_apps(void *data)
1d4b027a 1279{
5eb91c98
DG
1280 int sock = 0, i, ret, pollfd;
1281 uint32_t revents, nb_fd;
1282 struct lttng_poll_event events;
099e26bd
DG
1283 /*
1284 * Get allocated in this thread, enqueued to a global queue, dequeued and
1285 * freed in the manage apps thread.
1286 */
1287 struct ust_command *ust_cmd = NULL;
1d4b027a 1288
099e26bd 1289 DBG("[thread] Manage application registration started");
1d4b027a
DG
1290
1291 ret = lttcomm_listen_unix_sock(apps_sock);
1292 if (ret < 0) {
1293 goto error;
1294 }
1295
5eb91c98
DG
1296 /*
1297 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1298 * more will be added to this poll set.
1299 */
1300 ret = create_thread_poll_set(&events, 2);
1301 if (ret < 0) {
1302 goto error;
1303 }
273ea72c 1304
5eb91c98
DG
1305 /* Add the application registration socket */
1306 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1307 if (ret < 0) {
1308 goto error;
1309 }
273ea72c 1310
1d4b027a 1311 /* Notify all applications to register */
0fdd1e2c
DG
1312 ret = notify_ust_apps(1);
1313 if (ret < 0) {
1314 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1315 "Execution continues but there might be problem for already\n"
1316 "running applications that wishes to register.");
0fdd1e2c 1317 }
1d4b027a
DG
1318
1319 while (1) {
1320 DBG("Accepting application registration");
273ea72c 1321
5eb91c98
DG
1322 nb_fd = LTTNG_POLL_GETNB(&events);
1323
273ea72c 1324 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1325 ret = lttng_poll_wait(&events, -1);
273ea72c 1326 if (ret < 0) {
273ea72c
DG
1327 goto error;
1328 }
1329
5eb91c98
DG
1330 for (i = 0; i < nb_fd; i++) {
1331 /* Fetch once the poll data */
1332 revents = LTTNG_POLL_GETEV(&events, i);
1333 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1334
5eb91c98
DG
1335 /* Thread quit pipe has been closed. Killing thread. */
1336 ret = check_thread_quit_pipe(pollfd, revents);
1337 if (ret) {
90014c57
DG
1338 goto error;
1339 }
1d4b027a 1340
5eb91c98
DG
1341 /* Event on the registration socket */
1342 if (pollfd == apps_sock) {
1343 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1344 ERR("Register apps socket poll error");
1345 goto error;
1346 } else if (revents & LPOLLIN) {
1347 sock = lttcomm_accept_unix_sock(apps_sock);
1348 if (sock < 0) {
1349 goto error;
1350 }
099e26bd 1351
5eb91c98 1352 /* Create UST registration command for enqueuing */
ba7f0ae5 1353 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1354 if (ust_cmd == NULL) {
ba7f0ae5 1355 perror("ust command zmalloc");
5eb91c98
DG
1356 goto error;
1357 }
1d4b027a 1358
5eb91c98
DG
1359 /*
1360 * Using message-based transmissions to ensure we don't
1361 * have to deal with partially received messages.
1362 */
1363 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1364 sizeof(struct ust_register_msg));
1365 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1366 if (ret < 0) {
1367 perror("lttcomm_recv_unix_sock register apps");
1368 } else {
1369 ERR("Wrong size received on apps register");
1370 }
1371 free(ust_cmd);
1372 close(sock);
1373 continue;
1374 }
099e26bd 1375
5eb91c98 1376 ust_cmd->sock = sock;
099e26bd 1377
5eb91c98
DG
1378 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1379 " gid:%d sock:%d name:%s (version %d.%d)",
1380 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1381 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1382 ust_cmd->sock, ust_cmd->reg_msg.name,
1383 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1384
5eb91c98
DG
1385 /*
1386 * Lock free enqueue the registration request. The red pill
54d01ffb 1387 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1388 */
1389 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1390
1391 /*
1392 * Wake the registration queue futex. Implicit memory
1393 * barrier with the exchange in cds_wfq_enqueue.
1394 */
1395 futex_nto1_wake(&ust_cmd_queue.futex);
1396 }
1397 }
90014c57 1398 }
1d4b027a
DG
1399 }
1400
1401error:
0fdd1e2c
DG
1402 DBG("UST Registration thread dying");
1403
1404 /* Notify that the registration thread is gone */
1405 notify_ust_apps(0);
1406
1407 close(apps_sock);
1408 close(sock);
273ea72c 1409 unlink(apps_unix_sock_path);
0fdd1e2c 1410
5eb91c98
DG
1411 lttng_poll_clean(&events);
1412
1d4b027a
DG
1413 return NULL;
1414}
1415
8c0faa1d 1416/*
3bd1e081 1417 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1418 * exec or it will fails.
8c0faa1d 1419 */
3bd1e081 1420static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1421{
1422 int ret;
ee0b0061
DG
1423 struct timespec timeout;
1424
1425 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1426 timeout.tv_nsec = 0;
8c0faa1d
DG
1427
1428 /* Setup semaphore */
3bd1e081 1429 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1430 if (ret < 0) {
3bd1e081 1431 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1432 goto error;
1433 }
8c0faa1d 1434
3bd1e081
MD
1435 ret = pthread_create(&consumer_data->thread, NULL,
1436 thread_manage_consumer, consumer_data);
8c0faa1d 1437 if (ret != 0) {
3bd1e081 1438 PERROR("pthread_create consumer");
ee0b0061 1439 ret = -1;
8c0faa1d
DG
1440 goto error;
1441 }
1442
ee0b0061
DG
1443 /* Get time for sem_timedwait absolute timeout */
1444 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1445 if (ret < 0) {
3bd1e081 1446 PERROR("clock_gettime spawn consumer");
ee0b0061 1447 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1448 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1449 } else {
1450 /* Normal timeout if the gettime was successful */
1451 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1452 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1453 }
8c0faa1d 1454
ee0b0061
DG
1455 if (ret < 0) {
1456 if (errno == ETIMEDOUT) {
1457 /*
1458 * Call has timed out so we kill the kconsumerd_thread and return
1459 * an error.
1460 */
3bd1e081
MD
1461 ERR("The consumer thread was never ready. Killing it");
1462 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1463 if (ret < 0) {
3bd1e081 1464 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1465 }
1466 } else {
3bd1e081 1467 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1468 }
1469 goto error;
1470 }
1471
3bd1e081
MD
1472 pthread_mutex_lock(&consumer_data->pid_mutex);
1473 if (consumer_data->pid == 0) {
712ea556 1474 ERR("Kconsumerd did not start");
3bd1e081 1475 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1476 goto error;
1477 }
3bd1e081 1478 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1479
8c0faa1d
DG
1480 return 0;
1481
1482error:
1483 return ret;
1484}
1485
d9800920 1486/*
3bd1e081 1487 * Join consumer thread
d9800920 1488 */
3bd1e081 1489static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1490{
1491 void *status;
1492 int ret;
1493
3bd1e081
MD
1494 if (consumer_data->pid != 0) {
1495 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1496 if (ret) {
3bd1e081 1497 ERR("Error killing consumer daemon");
cf3af59e
MD
1498 return ret;
1499 }
3bd1e081 1500 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1501 } else {
1502 return 0;
1503 }
1504}
1505
8c0faa1d 1506/*
3bd1e081 1507 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1508 *
d063d709 1509 * Return pid if successful else -1.
8c0faa1d 1510 */
3bd1e081 1511static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1512{
1513 int ret;
1514 pid_t pid;
94c55f17 1515 const char *consumer_to_use;
53086306 1516 const char *verbosity;
94c55f17 1517 struct stat st;
8c0faa1d 1518
3bd1e081 1519 DBG("Spawning consumerd");
c49dc785 1520
8c0faa1d
DG
1521 pid = fork();
1522 if (pid == 0) {
1523 /*
3bd1e081 1524 * Exec consumerd.
8c0faa1d 1525 */
daee5345 1526 if (opt_verbose_consumer) {
53086306
DG
1527 verbosity = "--verbose";
1528 } else {
1529 verbosity = "--quiet";
1530 }
3bd1e081
MD
1531 switch (consumer_data->type) {
1532 case LTTNG_CONSUMER_KERNEL:
94c55f17 1533 /*
c7704d57
DG
1534 * Find out which consumerd to execute. We will first try the
1535 * 64-bit path, then the sessiond's installation directory, and
1536 * fallback on the 32-bit one,
94c55f17 1537 */
63a799e8
AM
1538 DBG3("Looking for a kernel consumer at these locations:");
1539 DBG3(" 1) %s", consumerd64_bin);
1540 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1541 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1542 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1543 DBG3("Found location #1");
94c55f17 1544 consumer_to_use = consumerd64_bin;
94c55f17 1545 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1546 DBG3("Found location #2");
94c55f17 1547 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1548 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1549 DBG3("Found location #3");
eb1e0bd4 1550 consumer_to_use = consumerd32_bin;
94c55f17 1551 } else {
63a799e8 1552 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1553 break;
1554 }
1555 DBG("Using kernel consumer at: %s", consumer_to_use);
1556 execl(consumer_to_use,
1557 "lttng-consumerd", verbosity, "-k",
1558 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1559 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1560 NULL);
3bd1e081 1561 break;
7753dea8
MD
1562 case LTTNG_CONSUMER64_UST:
1563 {
b1e0b6b6 1564 char *tmpnew = NULL;
8f4905da
MD
1565
1566 if (consumerd64_libdir[0] != '\0') {
1567 char *tmp;
1568 size_t tmplen;
1569
1570 tmp = getenv("LD_LIBRARY_PATH");
1571 if (!tmp) {
1572 tmp = "";
1573 }
1574 tmplen = strlen("LD_LIBRARY_PATH=")
1575 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1576 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1577 if (!tmpnew) {
1578 ret = -ENOMEM;
1579 goto error;
1580 }
1581 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1582 strcat(tmpnew, consumerd64_libdir);
1583 if (tmp[0] != '\0') {
1584 strcat(tmpnew, ":");
1585 strcat(tmpnew, tmp);
1586 }
1587 ret = putenv(tmpnew);
1588 if (ret) {
1589 ret = -errno;
1590 goto error;
1591 }
1592 }
94c55f17 1593 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1594 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1595 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1596 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1597 NULL);
8f4905da
MD
1598 if (consumerd64_libdir[0] != '\0') {
1599 free(tmpnew);
1600 }
1601 if (ret) {
1602 goto error;
1603 }
3bd1e081 1604 break;
7753dea8
MD
1605 }
1606 case LTTNG_CONSUMER32_UST:
1607 {
937dde8e 1608 char *tmpnew = NULL;
8f4905da
MD
1609
1610 if (consumerd32_libdir[0] != '\0') {
1611 char *tmp;
1612 size_t tmplen;
1613
1614 tmp = getenv("LD_LIBRARY_PATH");
1615 if (!tmp) {
1616 tmp = "";
1617 }
1618 tmplen = strlen("LD_LIBRARY_PATH=")
1619 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1620 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1621 if (!tmpnew) {
1622 ret = -ENOMEM;
1623 goto error;
1624 }
1625 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1626 strcat(tmpnew, consumerd32_libdir);
1627 if (tmp[0] != '\0') {
1628 strcat(tmpnew, ":");
1629 strcat(tmpnew, tmp);
1630 }
1631 ret = putenv(tmpnew);
1632 if (ret) {
1633 ret = -errno;
1634 goto error;
1635 }
1636 }
94c55f17 1637 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1638 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1639 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1640 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1641 NULL);
8f4905da
MD
1642 if (consumerd32_libdir[0] != '\0') {
1643 free(tmpnew);
1644 }
1645 if (ret) {
1646 goto error;
1647 }
7753dea8
MD
1648 break;
1649 }
3bd1e081
MD
1650 default:
1651 perror("unknown consumer type");
1652 exit(EXIT_FAILURE);
1653 }
8c0faa1d
DG
1654 if (errno != 0) {
1655 perror("kernel start consumer exec");
1656 }
1657 exit(EXIT_FAILURE);
1658 } else if (pid > 0) {
1659 ret = pid;
8c0faa1d 1660 } else {
3bd1e081 1661 perror("start consumer fork");
8c0faa1d 1662 ret = -errno;
8c0faa1d 1663 }
8f4905da 1664error:
8c0faa1d
DG
1665 return ret;
1666}
1667
693bd40b 1668/*
3bd1e081 1669 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1670 */
3bd1e081 1671static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1672{
1673 int ret;
1674
3bd1e081
MD
1675 pthread_mutex_lock(&consumer_data->pid_mutex);
1676 if (consumer_data->pid != 0) {
1677 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1678 goto end;
1679 }
693bd40b 1680
3bd1e081 1681 ret = spawn_consumerd(consumer_data);
c49dc785 1682 if (ret < 0) {
3bd1e081
MD
1683 ERR("Spawning consumerd failed");
1684 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1685 goto error;
693bd40b 1686 }
c49dc785 1687
3bd1e081
MD
1688 /* Setting up the consumer_data pid */
1689 consumer_data->pid = ret;
48842b30 1690 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1691 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1692
3bd1e081
MD
1693 DBG2("Spawning consumer control thread");
1694 ret = spawn_consumer_thread(consumer_data);
693bd40b 1695 if (ret < 0) {
3bd1e081 1696 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1697 goto error;
1698 }
1699
c49dc785 1700end:
693bd40b
DG
1701 return 0;
1702
1703error:
1704 return ret;
1705}
1706
b73401da 1707/*
d063d709 1708 * modprobe_kernel_modules
b73401da
DG
1709 */
1710static int modprobe_kernel_modules(void)
1711{
ab147185 1712 int ret = 0, i;
b73401da
DG
1713 char modprobe[256];
1714
ab147185
MD
1715 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1716 ret = snprintf(modprobe, sizeof(modprobe),
1717 "/sbin/modprobe %s%s",
24b487b8 1718 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1719 kernel_modules_list[i].name);
b73401da
DG
1720 if (ret < 0) {
1721 perror("snprintf modprobe");
1722 goto error;
1723 }
ab147185 1724 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1725 ret = system(modprobe);
ab147185
MD
1726 if (ret == -1) {
1727 ERR("Unable to launch modprobe for module %s",
1728 kernel_modules_list[i].name);
1729 } else if (kernel_modules_list[i].required
d9800920 1730 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1731 ERR("Unable to load module %s",
1732 kernel_modules_list[i].name);
1733 } else {
1734 DBG("Modprobe successfully %s",
1735 kernel_modules_list[i].name);
1736 }
1737 }
1738
1739error:
1740 return ret;
1741}
1742
b73401da 1743/*
d063d709 1744 * mount_debugfs
b73401da
DG
1745 */
1746static int mount_debugfs(char *path)
1747{
1748 int ret;
1749 char *type = "debugfs";
1750
e11d277b 1751 ret = run_as_mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1752 if (ret < 0) {
7272acf5 1753 PERROR("Cannot create debugfs path");
b73401da
DG
1754 goto error;
1755 }
1756
1757 ret = mount(type, path, type, 0, NULL);
1758 if (ret < 0) {
7272acf5 1759 PERROR("Cannot mount debugfs");
b73401da
DG
1760 goto error;
1761 }
1762
1763 DBG("Mounted debugfs successfully at %s", path);
1764
1765error:
1766 return ret;
1767}
1768
8c0faa1d 1769/*
d063d709 1770 * Setup necessary data for kernel tracer action.
8c0faa1d 1771 */
f3ed775e 1772static void init_kernel_tracer(void)
8c0faa1d 1773{
b73401da
DG
1774 int ret;
1775 char *proc_mounts = "/proc/mounts";
1776 char line[256];
684d34d2 1777 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1778 FILE *fp;
1779
1780 /* Detect debugfs */
1781 fp = fopen(proc_mounts, "r");
1782 if (fp == NULL) {
1783 ERR("Unable to probe %s", proc_mounts);
1784 goto error;
1785 }
1786
1787 while (fgets(line, sizeof(line), fp) != NULL) {
1788 if (strstr(line, "debugfs") != NULL) {
1789 /* Remove first string */
1790 strtok(line, " ");
1791 /* Dup string here so we can reuse line later on */
1792 debugfs_path = strdup(strtok(NULL, " "));
1793 DBG("Got debugfs path : %s", debugfs_path);
1794 break;
1795 }
1796 }
1797
1798 fclose(fp);
1799
1800 /* Mount debugfs if needded */
1801 if (debugfs_path == NULL) {
1802 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1803 if (ret < 0) {
1804 perror("asprintf debugfs path");
1805 goto error;
1806 }
1807 ret = mount_debugfs(debugfs_path);
1808 if (ret < 0) {
7272acf5 1809 perror("Cannot mount debugfs");
b73401da
DG
1810 goto error;
1811 }
1812 }
1813
1814 /* Modprobe lttng kernel modules */
1815 ret = modprobe_kernel_modules();
1816 if (ret < 0) {
1817 goto error;
1818 }
1819
1820 /* Setup lttng kernel path */
1821 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1822 if (ret < 0) {
1823 perror("asprintf lttng path");
1824 goto error;
1825 }
1826
1827 /* Open debugfs lttng */
1828 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1829 if (kernel_tracer_fd < 0) {
b73401da
DG
1830 DBG("Failed to open %s", lttng_path);
1831 goto error;
8c0faa1d
DG
1832 }
1833
b73401da
DG
1834 free(lttng_path);
1835 free(debugfs_path);
f3ed775e 1836 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1837 return;
1838
1839error:
1840 if (lttng_path) {
1841 free(lttng_path);
1842 }
1843 if (debugfs_path) {
1844 free(debugfs_path);
1845 }
1846 WARN("No kernel tracer available");
1847 kernel_tracer_fd = 0;
1848 return;
f3ed775e 1849}
33a2b854 1850
f3ed775e 1851/*
54d01ffb 1852 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1853 */
54d01ffb 1854static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1855{
f40799e8 1856 int ret = 0;
8c0faa1d 1857
3bd1e081 1858 if (session->consumer_fds_sent == 0) {
d9800920 1859 /*
54d01ffb
DG
1860 * Assign default kernel consumer socket if no consumer assigned to the
1861 * kernel session. At this point, it's NOT suppose to be 0 but this is
1862 * an extra security check.
d9800920
DG
1863 */
1864 if (session->consumer_fd == 0) {
3bd1e081 1865 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1866 }
1867
2bdd86d4 1868 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1869 if (ret < 0) {
f3ed775e
DG
1870 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1871 goto error;
1872 }
1d4b027a 1873
3bd1e081 1874 session->consumer_fds_sent = 1;
f3ed775e 1875 }
1d4b027a
DG
1876
1877error:
1878 return ret;
8c0faa1d
DG
1879}
1880
0177d773
DG
1881/*
1882 * Create an UST session and add it to the session ust list.
1883 */
44d3bd01 1884static int create_ust_session(struct ltt_session *session,
6df2e2c9 1885 struct lttng_domain *domain)
0177d773 1886{
13384287 1887 struct ltt_ust_session *lus = NULL;
6df2e2c9 1888 int ret;
44d3bd01
DG
1889
1890 switch (domain->type) {
48842b30 1891 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1892 break;
1893 default:
13384287 1894 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1895 goto error;
1896 }
0177d773
DG
1897
1898 DBG("Creating UST session");
1899
a991f516 1900 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1901 if (lus == NULL) {
44d3bd01 1902 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1903 goto error;
1904 }
1905
e11d277b 1906 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1907 session->uid, session->gid);
0177d773
DG
1908 if (ret < 0) {
1909 if (ret != -EEXIST) {
1910 ERR("Trace directory creation error");
44d3bd01 1911 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1912 goto error;
1913 }
1914 }
1915
f6a9efaa
DG
1916 /* The domain type dictate different actions on session creation */
1917 switch (domain->type) {
48842b30
DG
1918 case LTTNG_DOMAIN_UST:
1919 /* No ustctl for the global UST domain */
1920 break;
1921 default:
36dc12cc 1922 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1923 goto error;
0177d773 1924 }
6df2e2c9
MD
1925 lus->uid = session->uid;
1926 lus->gid = session->gid;
f6a9efaa 1927 session->ust_session = lus;
44d3bd01
DG
1928
1929 return LTTCOMM_OK;
0177d773
DG
1930
1931error:
1932 free(lus);
1933 return ret;
1934}
1935
333f285e 1936/*
d063d709 1937 * Create a kernel tracer session then create the default channel.
333f285e 1938 */
6df2e2c9 1939static int create_kernel_session(struct ltt_session *session)
333f285e 1940{
f3ed775e 1941 int ret;
f3ed775e
DG
1942
1943 DBG("Creating kernel session");
1944
1945 ret = kernel_create_session(session, kernel_tracer_fd);
1946 if (ret < 0) {
1947 ret = LTTCOMM_KERN_SESS_FAIL;
1948 goto error;
333f285e
DG
1949 }
1950
d9800920 1951 /* Set kernel consumer socket fd */
3bd1e081
MD
1952 if (kconsumer_data.cmd_sock) {
1953 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1954 }
1955
e11d277b 1956 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1957 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1958 if (ret < 0) {
996b65c8 1959 if (ret != -EEXIST) {
7a485870
DG
1960 ERR("Trace directory creation error");
1961 goto error;
1962 }
1963 }
6df2e2c9
MD
1964 session->kernel_session->uid = session->uid;
1965 session->kernel_session->gid = session->gid;
7a485870 1966
f3ed775e
DG
1967error:
1968 return ret;
333f285e
DG
1969}
1970
8e0af1b4 1971/*
c7704d57
DG
1972 * Check if the UID or GID match the session. Root user has access to all
1973 * sessions.
8e0af1b4 1974 */
c7704d57 1975static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1976{
c7704d57 1977 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
1978 return 0;
1979 } else {
1980 return 1;
1981 }
1982}
1983
1984static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1985{
1986 unsigned int i = 0;
1987 struct ltt_session *session;
1988
1989 DBG("Counting number of available session for UID %d GID %d",
1990 uid, gid);
1991 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1992 /*
1993 * Only list the sessions the user can control.
1994 */
1995 if (!session_access_ok(session, uid, gid)) {
1996 continue;
1997 }
1998 i++;
1999 }
2000 return i;
2001}
2002
6c9cc2ab
DG
2003/*
2004 * Using the session list, filled a lttng_session array to send back to the
2005 * client for session listing.
2006 *
2007 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2008 * session_lock_list() and session_unlock_list().
6c9cc2ab 2009 */
c7704d57
DG
2010static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2011 gid_t gid)
6c9cc2ab 2012{
8e0af1b4 2013 unsigned int i = 0;
6c9cc2ab
DG
2014 struct ltt_session *session;
2015
8e0af1b4
MD
2016 DBG("Getting all available session for UID %d GID %d",
2017 uid, gid);
6c9cc2ab
DG
2018 /*
2019 * Iterate over session list and append data after the control struct in
2020 * the buffer.
2021 */
2022 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
2023 /*
2024 * Only list the sessions the user can control.
2025 */
2026 if (!session_access_ok(session, uid, gid)) {
2027 continue;
2028 }
6c9cc2ab 2029 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2030 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2031 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2032 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2033 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
2034 i++;
2035 }
2036}
2037
9f19cc17
DG
2038/*
2039 * Fill lttng_channel array of all channels.
2040 */
b551a063 2041static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2042 struct lttng_channel *channels)
2043{
2044 int i = 0;
2045 struct ltt_kernel_channel *kchan;
2046
2047 DBG("Listing channels for session %s", session->name);
2048
b551a063
DG
2049 switch (domain) {
2050 case LTTNG_DOMAIN_KERNEL:
2051 /* Kernel channels */
2052 if (session->kernel_session != NULL) {
2053 cds_list_for_each_entry(kchan,
2054 &session->kernel_session->channel_list.head, list) {
2055 /* Copy lttng_channel struct to array */
2056 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2057 channels[i].enabled = kchan->enabled;
2058 i++;
2059 }
2060 }
2061 break;
2062 case LTTNG_DOMAIN_UST:
2063 {
bec39940 2064 struct lttng_ht_iter iter;
b551a063
DG
2065 struct ltt_ust_channel *uchan;
2066
bec39940
DG
2067 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2068 &iter.iter, uchan, node.node) {
b551a063
DG
2069 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2070 channels[i].attr.overwrite = uchan->attr.overwrite;
2071 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2072 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2073 channels[i].attr.switch_timer_interval =
2074 uchan->attr.switch_timer_interval;
2075 channels[i].attr.read_timer_interval =
2076 uchan->attr.read_timer_interval;
aea829b3 2077 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2078 switch (uchan->attr.output) {
2079 case LTTNG_UST_MMAP:
2080 default:
2081 channels[i].attr.output = LTTNG_EVENT_MMAP;
2082 break;
2083 }
befe0905 2084 i++;
b551a063
DG
2085 }
2086 break;
2087 }
2088 default:
2089 break;
2090 }
2091}
2092
2093/*
2094 * Create a list of ust global domain events.
2095 */
2096static int list_lttng_ust_global_events(char *channel_name,
2097 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2098{
2099 int i = 0, ret = 0;
2100 unsigned int nb_event = 0;
bec39940
DG
2101 struct lttng_ht_iter iter;
2102 struct lttng_ht_node_str *node;
b551a063
DG
2103 struct ltt_ust_channel *uchan;
2104 struct ltt_ust_event *uevent;
2105 struct lttng_event *tmp;
2106
2107 DBG("Listing UST global events for channel %s", channel_name);
2108
2109 rcu_read_lock();
2110
bec39940
DG
2111 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2112 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2113 if (node == NULL) {
2114 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2115 goto error;
b551a063
DG
2116 }
2117
bec39940 2118 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2119
bec39940 2120 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2121
b551a063
DG
2122 if (nb_event == 0) {
2123 ret = nb_event;
2124 goto error;
2125 }
2126
2127 DBG3("Listing UST global %d events", nb_event);
2128
2129 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2130 if (tmp == NULL) {
2131 ret = -LTTCOMM_FATAL;
2132 goto error;
2133 }
2134
bec39940 2135 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2136 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2137 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2138 tmp[i].enabled = uevent->enabled;
2139 switch (uevent->attr.instrumentation) {
2140 case LTTNG_UST_TRACEPOINT:
2141 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2142 break;
2143 case LTTNG_UST_PROBE:
2144 tmp[i].type = LTTNG_EVENT_PROBE;
2145 break;
2146 case LTTNG_UST_FUNCTION:
2147 tmp[i].type = LTTNG_EVENT_FUNCTION;
2148 break;
ac3bd9c0 2149 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2150 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2151 break;
9f19cc17 2152 }
d7b75b30 2153 i++;
9f19cc17
DG
2154 }
2155
b551a063
DG
2156 ret = nb_event;
2157 *events = tmp;
2158
2159error:
2160 rcu_read_unlock();
2161 return ret;
9f19cc17
DG
2162}
2163
2164/*
b551a063 2165 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2166 */
b551a063
DG
2167static int list_lttng_kernel_events(char *channel_name,
2168 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2169{
b551a063
DG
2170 int i = 0, ret;
2171 unsigned int nb_event;
9f19cc17 2172 struct ltt_kernel_event *event;
b551a063
DG
2173 struct ltt_kernel_channel *kchan;
2174
2175 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2176 if (kchan == NULL) {
2177 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2178 goto error;
2179 }
2180
2181 nb_event = kchan->event_count;
9f19cc17
DG
2182
2183 DBG("Listing events for channel %s", kchan->channel->name);
2184
b551a063
DG
2185 if (nb_event == 0) {
2186 ret = nb_event;
2187 goto error;
2188 }
2189
2190 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2191 if (*events == NULL) {
2192 ret = LTTCOMM_FATAL;
2193 goto error;
2194 }
2195
9f19cc17
DG
2196 /* Kernel channels */
2197 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2198 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2199 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2200 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2201 switch (event->event->instrumentation) {
2202 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2203 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2204 break;
2205 case LTTNG_KERNEL_KPROBE:
2206 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2207 (*events)[i].type = LTTNG_EVENT_PROBE;
2208 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2209 sizeof(struct lttng_kernel_kprobe));
2210 break;
2211 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2212 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2213 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2214 sizeof(struct lttng_kernel_function));
2215 break;
0133c199 2216 case LTTNG_KERNEL_NOOP:
b551a063 2217 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2218 break;
a54bd42d 2219 case LTTNG_KERNEL_SYSCALL:
b551a063 2220 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2221 break;
7a3d1328
MD
2222 case LTTNG_KERNEL_ALL:
2223 assert(0);
2224 break;
9f19cc17
DG
2225 }
2226 i++;
2227 }
b551a063
DG
2228
2229 return nb_event;
2230
2231error:
2232 return ret;
9f19cc17
DG
2233}
2234
fac6795d 2235/*
54d01ffb 2236 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2237 */
54d01ffb
DG
2238static int cmd_disable_channel(struct ltt_session *session,
2239 int domain, char *channel_name)
fac6795d 2240{
54d01ffb 2241 int ret;
78f0bacd
DG
2242 struct ltt_ust_session *usess;
2243
2244 usess = session->ust_session;
379473d2 2245
54d01ffb 2246 switch (domain) {
78f0bacd
DG
2247 case LTTNG_DOMAIN_KERNEL:
2248 {
2249 ret = channel_kernel_disable(session->kernel_session,
2250 channel_name);
2251 if (ret != LTTCOMM_OK) {
2252 goto error;
2253 }
54d01ffb 2254
78f0bacd
DG
2255 kernel_wait_quiescent(kernel_tracer_fd);
2256 break;
2257 }
2258 case LTTNG_DOMAIN_UST:
2259 {
2260 struct ltt_ust_channel *uchan;
bec39940 2261 struct lttng_ht *chan_ht;
78f0bacd 2262
7885e399
DG
2263 chan_ht = usess->domain_global.channels;
2264
2265 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2266 if (uchan == NULL) {
2267 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2268 goto error;
78f0bacd
DG
2269 }
2270
7885e399
DG
2271 ret = channel_ust_disable(usess, domain, uchan);
2272 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2273 goto error;
2274 }
78f0bacd
DG
2275 break;
2276 }
2277 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2278 case LTTNG_DOMAIN_UST_EXEC_NAME:
2279 case LTTNG_DOMAIN_UST_PID:
2280 ret = LTTCOMM_NOT_IMPLEMENTED;
2281 goto error;
2282 default:
2283 ret = LTTCOMM_UNKNOWN_DOMAIN;
2284 goto error;
20fe2104
DG
2285 }
2286
54d01ffb 2287 ret = LTTCOMM_OK;
d65106b1 2288
54d01ffb
DG
2289error:
2290 return ret;
2291}
2292
2293/*
2294 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2295 */
44d3bd01 2296static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2297 int domain, struct lttng_channel *attr)
54d01ffb
DG
2298{
2299 int ret;
f6a9efaa 2300 struct ltt_ust_session *usess = session->ust_session;
bec39940 2301 struct lttng_ht *chan_ht;
f6a9efaa 2302
5d56b5aa 2303 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2304
aea829b3 2305 switch (domain) {
44d3bd01
DG
2306 case LTTNG_DOMAIN_KERNEL:
2307 {
2308 struct ltt_kernel_channel *kchan;
54d01ffb 2309
44d3bd01
DG
2310 kchan = trace_kernel_get_channel_by_name(attr->name,
2311 session->kernel_session);
2312 if (kchan == NULL) {
2313 ret = channel_kernel_create(session->kernel_session,
2314 attr, kernel_poll_pipe[1]);
2315 } else {
2316 ret = channel_kernel_enable(session->kernel_session, kchan);
2317 }
2318
2319 if (ret != LTTCOMM_OK) {
2320 goto error;
2321 }
2322
2323 kernel_wait_quiescent(kernel_tracer_fd);
2324 break;
2325 }
f6a9efaa
DG
2326 case LTTNG_DOMAIN_UST:
2327 {
2328 struct ltt_ust_channel *uchan;
2329
7885e399 2330 chan_ht = usess->domain_global.channels;
f6a9efaa 2331
7885e399 2332 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2333 if (uchan == NULL) {
7885e399 2334 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2335 } else {
7885e399 2336 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2337 }
f6a9efaa
DG
2338 break;
2339 }
78f0bacd
DG
2340 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2341 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2342 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG
2343 ret = LTTCOMM_NOT_IMPLEMENTED;
2344 goto error;
44d3bd01
DG
2345 default:
2346 ret = LTTCOMM_UNKNOWN_DOMAIN;
2347 goto error;
54d01ffb
DG
2348 }
2349
54d01ffb
DG
2350error:
2351 return ret;
2352}
2353
2354/*
2355 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2356 */
2357static int cmd_disable_event(struct ltt_session *session, int domain,
2358 char *channel_name, char *event_name)
2359{
2360 int ret;
54d01ffb
DG
2361
2362 switch (domain) {
2363 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2364 {
2365 struct ltt_kernel_channel *kchan;
b0a40d28 2366 struct ltt_kernel_session *ksess;
2bdd86d4 2367
b0a40d28
DG
2368 ksess = session->kernel_session;
2369
2370 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2371 if (kchan == NULL) {
2372 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2373 goto error;
d65106b1
DG
2374 }
2375
b0a40d28 2376 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2377 if (ret != LTTCOMM_OK) {
2378 goto error;
2379 }
2380
2381 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2382 break;
2bdd86d4
MD
2383 }
2384 case LTTNG_DOMAIN_UST:
b0a40d28 2385 {
b0a40d28 2386 struct ltt_ust_channel *uchan;
7f79d3a1 2387 struct ltt_ust_session *usess;
b0a40d28
DG
2388
2389 usess = session->ust_session;
2390
2391 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2392 channel_name);
2393 if (uchan == NULL) {
2394 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2395 goto error;
2396 }
2397
7f79d3a1
DG
2398 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2399 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2400 goto error;
2401 }
2402
7f79d3a1 2403 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2404 channel_name);
b0a40d28
DG
2405 break;
2406 }
2bdd86d4
MD
2407 case LTTNG_DOMAIN_UST_EXEC_NAME:
2408 case LTTNG_DOMAIN_UST_PID:
2409 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2410 default:
54d01ffb
DG
2411 ret = LTTCOMM_NOT_IMPLEMENTED;
2412 goto error;
d65106b1 2413 }
26cc6b4e 2414
54d01ffb
DG
2415 ret = LTTCOMM_OK;
2416
2417error:
2418 return ret;
2419}
2420
2421/*
2422 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2423 */
2424static int cmd_disable_event_all(struct ltt_session *session, int domain,
2425 char *channel_name)
2426{
2427 int ret;
54d01ffb
DG
2428
2429 switch (domain) {
2430 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2431 {
2432 struct ltt_kernel_session *ksess;
2433 struct ltt_kernel_channel *kchan;
2434
2435 ksess = session->kernel_session;
2436
2437 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2438 if (kchan == NULL) {
2439 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2440 goto error;
26cc6b4e
DG
2441 }
2442
9730260e 2443 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2444 if (ret != LTTCOMM_OK) {
0b97ec54 2445 goto error;
26cc6b4e
DG
2446 }
2447
54d01ffb 2448 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2449 break;
9730260e
DG
2450 }
2451 case LTTNG_DOMAIN_UST:
2452 {
2453 struct ltt_ust_session *usess;
2454 struct ltt_ust_channel *uchan;
2455
2456 usess = session->ust_session;
2457
2458 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2459 channel_name);
2460 if (uchan == NULL) {
2461 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2462 goto error;
2463 }
2464
7f79d3a1
DG
2465 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2466 if (ret != 0) {
9730260e
DG
2467 goto error;
2468 }
2469
7f79d3a1 2470 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2471
2472 break;
2473 }
2474 case LTTNG_DOMAIN_UST_EXEC_NAME:
2475 case LTTNG_DOMAIN_UST_PID:
2476 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2477 default:
54d01ffb
DG
2478 ret = LTTCOMM_NOT_IMPLEMENTED;
2479 goto error;
26cc6b4e 2480 }
e953ef25 2481
54d01ffb 2482 ret = LTTCOMM_OK;
e953ef25 2483
54d01ffb
DG
2484error:
2485 return ret;
2486}
f5177a38 2487
54d01ffb
DG
2488/*
2489 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2490 */
2491static int cmd_add_context(struct ltt_session *session, int domain,
2492 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2493{
2494 int ret;
f5177a38 2495
54d01ffb
DG
2496 switch (domain) {
2497 case LTTNG_DOMAIN_KERNEL:
2498 /* Add kernel context to kernel tracer */
2499 ret = context_kernel_add(session->kernel_session, ctx,
2500 event_name, channel_name);
2501 if (ret != LTTCOMM_OK) {
f5177a38 2502 goto error;
e953ef25 2503 }
2bdd86d4
MD
2504 break;
2505 case LTTNG_DOMAIN_UST:
2506 {
55cc08a6 2507 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2508
55cc08a6
DG
2509 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2510 if (ret != LTTCOMM_OK) {
2511 goto error;
2bdd86d4 2512 }
e953ef25 2513 break;
2bdd86d4 2514 }
55cc08a6
DG
2515 case LTTNG_DOMAIN_UST_EXEC_NAME:
2516 case LTTNG_DOMAIN_UST_PID:
2517 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2518 default:
54d01ffb
DG
2519 ret = LTTCOMM_NOT_IMPLEMENTED;
2520 goto error;
e953ef25 2521 }
950131af 2522
54d01ffb 2523 ret = LTTCOMM_OK;
950131af 2524
54d01ffb
DG
2525error:
2526 return ret;
2527}
2528
2529/*
2530 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD
2531 *
2532 * TODO: currently, both events and loglevels are kept within the same
2533 * namespace for UST global registry/app registery, so if an event
2534 * happen to have the same name as the loglevel (very unlikely though),
2535 * and an attempt is made to enable/disable both in the same session,
2536 * the first to be created will be the only one allowed to exist.
54d01ffb
DG
2537 */
2538static int cmd_enable_event(struct ltt_session *session, int domain,
2539 char *channel_name, struct lttng_event *event)
2540{
2541 int ret;
f6cd6b0f 2542 struct lttng_channel *attr;
48842b30 2543 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2544
2545 switch (domain) {
2546 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2547 {
2548 struct ltt_kernel_channel *kchan;
2549
54d01ffb
DG
2550 kchan = trace_kernel_get_channel_by_name(channel_name,
2551 session->kernel_session);
2552 if (kchan == NULL) {
f6cd6b0f
DG
2553 attr = channel_new_default_attr(domain);
2554 if (attr == NULL) {
2555 ret = LTTCOMM_FATAL;
2556 goto error;
2557 }
2558 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2559
54d01ffb 2560 /* This call will notify the kernel thread */
44d3bd01 2561 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2562 attr, kernel_poll_pipe[1]);
54d01ffb 2563 if (ret != LTTCOMM_OK) {
ff4d74e6 2564 free(attr);
f5177a38
DG
2565 goto error;
2566 }
ff4d74e6 2567 free(attr);
54d01ffb 2568 }
950131af 2569
54d01ffb
DG
2570 /* Get the newly created kernel channel pointer */
2571 kchan = trace_kernel_get_channel_by_name(channel_name,
2572 session->kernel_session);
2573 if (kchan == NULL) {
2574 /* This sould not happen... */
2575 ret = LTTCOMM_FATAL;
2576 goto error;
2577 }
f5177a38 2578
48842b30
DG
2579 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2580 event);
54d01ffb 2581 if (ret != LTTCOMM_OK) {
f5177a38 2582 goto error;
950131af
DG
2583 }
2584
54d01ffb 2585 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2586 break;
2bdd86d4
MD
2587 }
2588 case LTTNG_DOMAIN_UST:
2589 {
aea829b3 2590 struct lttng_channel *attr;
edb67388 2591 struct ltt_ust_channel *uchan;
2bdd86d4 2592
edb67388 2593 /* Get channel from global UST domain */
48842b30
DG
2594 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2595 channel_name);
2596 if (uchan == NULL) {
aea829b3
DG
2597 /* Create default channel */
2598 attr = channel_new_default_attr(domain);
2599 if (attr == NULL) {
2600 ret = LTTCOMM_FATAL;
2601 goto error;
2602 }
596219f7 2603 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2604 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2605
7885e399 2606 ret = channel_ust_create(usess, domain, attr);
edb67388 2607 if (ret != LTTCOMM_OK) {
ff4d74e6 2608 free(attr);
aea829b3
DG
2609 goto error;
2610 }
aea829b3
DG
2611 free(attr);
2612
2613 /* Get the newly created channel reference back */
2614 uchan = trace_ust_find_channel_by_name(
2615 usess->domain_global.channels, channel_name);
2616 if (uchan == NULL) {
2617 /* Something is really wrong */
2618 ret = LTTCOMM_FATAL;
2619 goto error;
2620 }
48842b30 2621 }
2bdd86d4 2622
edb67388 2623 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2624 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2625 if (ret != LTTCOMM_OK) {
48842b30 2626 goto error;
2bdd86d4
MD
2627 }
2628 break;
2629 }
2630 case LTTNG_DOMAIN_UST_EXEC_NAME:
2631 case LTTNG_DOMAIN_UST_PID:
2632 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2633 default:
54d01ffb
DG
2634 ret = LTTCOMM_NOT_IMPLEMENTED;
2635 goto error;
950131af 2636 }
d36b8583 2637
54d01ffb 2638 ret = LTTCOMM_OK;
d36b8583 2639
54d01ffb
DG
2640error:
2641 return ret;
2642}
7d29a247 2643
54d01ffb
DG
2644/*
2645 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2646 */
2647static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2648 char *channel_name, int event_type)
54d01ffb
DG
2649{
2650 int ret;
2651 struct ltt_kernel_channel *kchan;
7d29a247 2652
54d01ffb
DG
2653 switch (domain) {
2654 case LTTNG_DOMAIN_KERNEL:
2655 kchan = trace_kernel_get_channel_by_name(channel_name,
2656 session->kernel_session);
2657 if (kchan == NULL) {
2658 /* This call will notify the kernel thread */
44d3bd01
DG
2659 ret = channel_kernel_create(session->kernel_session, NULL,
2660 kernel_poll_pipe[1]);
54d01ffb
DG
2661 if (ret != LTTCOMM_OK) {
2662 goto error;
d36b8583 2663 }
0d0c377a 2664
8f69e5eb
DG
2665 /* Get the newly created kernel channel pointer */
2666 kchan = trace_kernel_get_channel_by_name(channel_name,
2667 session->kernel_session);
2668 if (kchan == NULL) {
2669 /* This sould not happen... */
2670 ret = LTTCOMM_FATAL;
2671 goto error;
2672 }
2673
54d01ffb 2674 }
0fdd1e2c 2675
7a3d1328 2676 switch (event_type) {
76d45b40 2677 case LTTNG_EVENT_SYSCALL:
7a3d1328 2678 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2679 kchan, kernel_tracer_fd);
7a3d1328 2680 break;
76d45b40 2681 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2682 /*
7a3d1328
MD
2683 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2684 * events already registered to the channel.
8c9ae521 2685 */
7a3d1328
MD
2686 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2687 kchan, kernel_tracer_fd);
2688 break;
76d45b40 2689 case LTTNG_EVENT_ALL:
7a3d1328 2690 /* Enable syscalls and tracepoints */
8c9ae521
DG
2691 ret = event_kernel_enable_all(session->kernel_session,
2692 kchan, kernel_tracer_fd);
7a3d1328
MD
2693 break;
2694 default:
2695 ret = LTTCOMM_KERN_ENABLE_FAIL;
2696 goto error;
8c9ae521 2697 }
8f69e5eb
DG
2698
2699 /* Manage return value */
54d01ffb 2700 if (ret != LTTCOMM_OK) {
0d0c377a 2701 goto error;
d36b8583
DG
2702 }
2703
54d01ffb 2704 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2705 break;
76d45b40
DG
2706 case LTTNG_DOMAIN_UST:
2707 {
2708 struct lttng_channel *attr;
2709 struct ltt_ust_channel *uchan;
2710 struct ltt_ust_session *usess = session->ust_session;
2711
2712 /* Get channel from global UST domain */
2713 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2714 channel_name);
2715 if (uchan == NULL) {
2716 /* Create default channel */
2717 attr = channel_new_default_attr(domain);
2718 if (attr == NULL) {
2719 ret = LTTCOMM_FATAL;
2720 goto error;
2721 }
2722 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2723 attr->name[NAME_MAX - 1] = '\0';
2724
2725 /* Use the internal command enable channel */
7885e399 2726 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2727 if (ret != LTTCOMM_OK) {
2728 free(attr);
2729 goto error;
2730 }
2731 free(attr);
2732
2733 /* Get the newly created channel reference back */
2734 uchan = trace_ust_find_channel_by_name(
2735 usess->domain_global.channels, channel_name);
2736 if (uchan == NULL) {
2737 /* Something is really wrong */
2738 ret = LTTCOMM_FATAL;
2739 goto error;
2740 }
2741 }
2742
2743 /* At this point, the session and channel exist on the tracer */
2744
2745 switch (event_type) {
2746 case LTTNG_EVENT_ALL:
2747 case LTTNG_EVENT_TRACEPOINT:
2748 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2749 if (ret != LTTCOMM_OK) {
2750 goto error;
2751 }
2752 break;
2753 default:
2754 ret = LTTCOMM_UST_ENABLE_FAIL;
2755 goto error;
2756 }
2757
2758 /* Manage return value */
2759 if (ret != LTTCOMM_OK) {
2760 goto error;
2761 }
2762
2763 break;
2764 }
2765 case LTTNG_DOMAIN_UST_EXEC_NAME:
2766 case LTTNG_DOMAIN_UST_PID:
2767 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2768 default:
54d01ffb
DG
2769 ret = LTTCOMM_NOT_IMPLEMENTED;
2770 goto error;
d36b8583 2771 }
f3ed775e 2772
54d01ffb
DG
2773 ret = LTTCOMM_OK;
2774
2775error:
2776 return ret;
2777}
2778
2779/*
2780 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2781 */
2782static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2783{
2784 int ret;
2785 ssize_t nb_events = 0;
2786
2787 switch (domain) {
2788 case LTTNG_DOMAIN_KERNEL:
2789 nb_events = kernel_list_events(kernel_tracer_fd, events);
2790 if (nb_events < 0) {
2791 ret = LTTCOMM_KERN_LIST_FAIL;
2792 goto error;
894be886 2793 }
54d01ffb 2794 break;
b551a063
DG
2795 case LTTNG_DOMAIN_UST:
2796 nb_events = ust_app_list_events(events);
2797 if (nb_events < 0) {
2798 ret = LTTCOMM_UST_LIST_FAIL;
2799 goto error;
2800 }
2801 break;
54d01ffb 2802 default:
54d01ffb
DG
2803 ret = LTTCOMM_NOT_IMPLEMENTED;
2804 goto error;
2805 }
894be886 2806
54d01ffb 2807 return nb_events;
7d29a247 2808
54d01ffb
DG
2809error:
2810 /* Return negative value to differentiate return code */
2811 return -ret;
2812}
b389abbe 2813
54d01ffb
DG
2814/*
2815 * Command LTTNG_START_TRACE processed by the client thread.
2816 */
2817static int cmd_start_trace(struct ltt_session *session)
2818{
2819 int ret;
54d01ffb 2820 struct ltt_kernel_session *ksession;
b9d9b220 2821 struct ltt_ust_session *usess;
b389abbe 2822
54d01ffb
DG
2823 /* Short cut */
2824 ksession = session->kernel_session;
b9d9b220 2825 usess = session->ust_session;
5eb91c98 2826
b9ef1c83
DG
2827 if (session->enabled) {
2828 ret = LTTCOMM_UST_START_FAIL;
2829 goto error;
2830 }
2831
464dd62d
MD
2832 session->enabled = 1;
2833
54d01ffb
DG
2834 /* Kernel tracing */
2835 if (ksession != NULL) {
2bdd86d4
MD
2836 struct ltt_kernel_channel *kchan;
2837
54d01ffb
DG
2838 /* Open kernel metadata */
2839 if (ksession->metadata == NULL) {
2840 ret = kernel_open_metadata(ksession, ksession->trace_path);
2841 if (ret < 0) {
2842 ret = LTTCOMM_KERN_META_FAIL;
2843 goto error;
b389abbe 2844 }
54d01ffb 2845 }
7d29a247 2846
54d01ffb
DG
2847 /* Open kernel metadata stream */
2848 if (ksession->metadata_stream_fd == 0) {
2849 ret = kernel_open_metadata_stream(ksession);
2850 if (ret < 0) {
2851 ERR("Kernel create metadata stream failed");
2852 ret = LTTCOMM_KERN_STREAM_FAIL;
2853 goto error;
2854 }
2855 }
2856
2857 /* For each channel */
2858 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2859 if (kchan->stream_count == 0) {
2860 ret = kernel_open_channel_stream(kchan);
2861 if (ret < 0) {
2862 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2863 goto error;
2864 }
54d01ffb
DG
2865 /* Update the stream global counter */
2866 ksession->stream_count_global += ret;
7d29a247 2867 }
54d01ffb
DG
2868 }
2869
2870 /* Setup kernel consumer socket and send fds to it */
2871 ret = init_kernel_tracing(ksession);
2872 if (ret < 0) {
2873 ret = LTTCOMM_KERN_START_FAIL;
2874 goto error;
2875 }
2876
2877 /* This start the kernel tracing */
2878 ret = kernel_start_session(ksession);
2879 if (ret < 0) {
2880 ret = LTTCOMM_KERN_START_FAIL;
2881 goto error;
2882 }
2883
2884 /* Quiescent wait after starting trace */
2885 kernel_wait_quiescent(kernel_tracer_fd);
2886 }
2887
36dc12cc 2888 /* Flag session that trace should start automatically */
b9d9b220
DG
2889 if (usess) {
2890 usess->start_trace = 1;
36dc12cc 2891
b9d9b220
DG
2892 ret = ust_app_start_trace_all(usess);
2893 if (ret < 0) {
2894 ret = LTTCOMM_UST_START_FAIL;
2895 goto error;
2896 }
2bdd86d4 2897 }
54d01ffb
DG
2898
2899 ret = LTTCOMM_OK;
2900
2901error:
2902 return ret;
2903}
2904
2905/*
2906 * Command LTTNG_STOP_TRACE processed by the client thread.
2907 */
2908static int cmd_stop_trace(struct ltt_session *session)
2909{
2910 int ret;
2911 struct ltt_kernel_channel *kchan;
2912 struct ltt_kernel_session *ksession;
8be98f9a 2913 struct ltt_ust_session *usess;
54d01ffb
DG
2914
2915 /* Short cut */
2916 ksession = session->kernel_session;
8be98f9a 2917 usess = session->ust_session;
54d01ffb 2918
b9ef1c83 2919 if (!session->enabled) {
190df5ac 2920 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG
2921 goto error;
2922 }
2923
464dd62d
MD
2924 session->enabled = 0;
2925
54d01ffb
DG
2926 /* Kernel tracer */
2927 if (ksession != NULL) {
2928 DBG("Stop kernel tracing");
2929
2930 /* Flush all buffers before stopping */
2931 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2932 if (ret < 0) {
2933 ERR("Kernel metadata flush failed");
2934 }
f34daff7 2935
54d01ffb
DG
2936 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2937 ret = kernel_flush_buffer(kchan);
0d0c377a 2938 if (ret < 0) {
54d01ffb 2939 ERR("Kernel flush buffer error");
7d29a247 2940 }
54d01ffb 2941 }
19e70852 2942
54d01ffb
DG
2943 ret = kernel_stop_session(ksession);
2944 if (ret < 0) {
2945 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2946 goto error;
f3ed775e 2947 }
54d01ffb
DG
2948
2949 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2950 }
54d01ffb 2951
8be98f9a
MD
2952 if (usess) {
2953 usess->start_trace = 0;
2bdd86d4 2954
8be98f9a 2955 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2956 if (ret < 0) {
190df5ac 2957 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
2958 goto error;
2959 }
2bdd86d4 2960 }
54d01ffb
DG
2961
2962 ret = LTTCOMM_OK;
2963
2964error:
2965 return ret;
2966}
2967
2968/*
2969 * Command LTTNG_CREATE_SESSION processed by the client thread.
2970 */
6df2e2c9 2971static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG
2972{
2973 int ret;
2974
6df2e2c9 2975 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG
2976 if (ret != LTTCOMM_OK) {
2977 goto error;
2978 }
2979
2980 ret = LTTCOMM_OK;
2981
2982error:
2983 return ret;
2984}
2985
2986/*
2987 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2988 */
2989static int cmd_destroy_session(struct ltt_session *session, char *name)
2990{
2991 int ret;
2992
2993 /* Clean kernel session teardown */
2994 teardown_kernel_session(session);
84cd17c6
MD
2995 /* UST session teardown */
2996 teardown_ust_session(session);
54d01ffb
DG
2997
2998 /*
2999 * Must notify the kernel thread here to update it's poll setin order
3000 * to remove the channel(s)' fd just destroyed.
3001 */
3002 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3003 if (ret < 0) {
3004 perror("write kernel poll pipe");
3005 }
3006
271933a4 3007 ret = session_destroy(session);
54d01ffb
DG
3008
3009 return ret;
3010}
3011
3012/*
3013 * Command LTTNG_CALIBRATE processed by the client thread.
3014 */
3015static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3016{
3017 int ret;
3018
3019 switch (domain) {
3020 case LTTNG_DOMAIN_KERNEL:
33a2b854 3021 {
54d01ffb 3022 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3023
54d01ffb
DG
3024 kcalibrate.type = calibrate->type;
3025 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3026 if (ret < 0) {
54d01ffb
DG
3027 ret = LTTCOMM_KERN_ENABLE_FAIL;
3028 goto error;
33a2b854 3029 }
54d01ffb
DG
3030 break;
3031 }
3032 default:
3033 /* TODO: Userspace tracing */
3034 ret = LTTCOMM_NOT_IMPLEMENTED;
3035 goto error;
3036 }
33a2b854 3037
54d01ffb 3038 ret = LTTCOMM_OK;
33a2b854 3039
54d01ffb
DG
3040error:
3041 return ret;
3042}
7d29a247 3043
54d01ffb
DG
3044/*
3045 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3046 */
3047static int cmd_register_consumer(struct ltt_session *session, int domain,
3048 char *sock_path)
3049{
3050 int ret, sock;
b389abbe 3051
54d01ffb
DG
3052 switch (domain) {
3053 case LTTNG_DOMAIN_KERNEL:
3054 /* Can't register a consumer if there is already one */
48c4f28c 3055 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3056 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3057 goto error;
3058 }
3059
3060 sock = lttcomm_connect_unix_sock(sock_path);
3061 if (sock < 0) {
3062 ret = LTTCOMM_CONNECT_FAIL;
3063 goto error;
3064 }
3065
3066 session->kernel_session->consumer_fd = sock;
3067 break;
3068 default:
3069 /* TODO: Userspace tracing */
3070 ret = LTTCOMM_NOT_IMPLEMENTED;
3071 goto error;
3072 }
3073
3074 ret = LTTCOMM_OK;
3075
3076error:
3077 return ret;
3078}
3079
3080/*
3081 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3082 */
3083static ssize_t cmd_list_domains(struct ltt_session *session,
3084 struct lttng_domain **domains)
3085{
b551a063 3086 int ret, index = 0;
54d01ffb
DG
3087 ssize_t nb_dom = 0;
3088
3089 if (session->kernel_session != NULL) {
b551a063 3090 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3091 nb_dom++;
3092 }
3093
b551a063
DG
3094 if (session->ust_session != NULL) {
3095 DBG3("Listing domains found UST global domain");
3096 nb_dom++;
3097 }
54d01ffb 3098
b551a063 3099 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3100 if (*domains == NULL) {
3101 ret = -LTTCOMM_FATAL;
3102 goto error;
3103 }
3104
b551a063
DG
3105 if (session->kernel_session != NULL) {
3106 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3107 index++;
3108 }
3109
3110 if (session->ust_session != NULL) {
3111 (*domains)[index].type = LTTNG_DOMAIN_UST;
3112 index++;
3113 }
54d01ffb 3114
54d01ffb
DG
3115 return nb_dom;
3116
3117error:
3118 return ret;
3119}
3120
3121/*
3122 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3123 */
b551a063 3124static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3125 struct lttng_channel **channels)
3126{
3127 int ret;
3128 ssize_t nb_chan = 0;
3129
b551a063
DG
3130 switch (domain) {
3131 case LTTNG_DOMAIN_KERNEL:
3132 if (session->kernel_session != NULL) {
3133 nb_chan = session->kernel_session->channel_count;
3134 }
0df502fd 3135 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3136 break;
3137 case LTTNG_DOMAIN_UST:
3138 if (session->ust_session != NULL) {
bec39940 3139 nb_chan = lttng_ht_get_count(
b551a063
DG
3140 session->ust_session->domain_global.channels);
3141 }
0df502fd 3142 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3143 break;
3144 default:
3145 *channels = NULL;
3146 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3147 goto error;
3148 }
3149
b551a063
DG
3150 if (nb_chan > 0) {
3151 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3152 if (*channels == NULL) {
3153 ret = -LTTCOMM_FATAL;
3154 goto error;
3155 }
54d01ffb 3156
b551a063
DG
3157 list_lttng_channels(domain, session, *channels);
3158 } else {
3159 *channels = NULL;
3160 }
2bdd86d4 3161
54d01ffb
DG
3162 return nb_chan;
3163
3164error:
3165 return ret;
3166}
3167
3168/*
3169 * Command LTTNG_LIST_EVENTS processed by the client thread.
3170 */
b551a063 3171static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3172 char *channel_name, struct lttng_event **events)
3173{
b551a063 3174 int ret = 0;
54d01ffb 3175 ssize_t nb_event = 0;
54d01ffb 3176
b551a063
DG
3177 switch (domain) {
3178 case LTTNG_DOMAIN_KERNEL:
3179 if (session->kernel_session != NULL) {
3180 nb_event = list_lttng_kernel_events(channel_name,
3181 session->kernel_session, events);
54d01ffb 3182 }
b551a063
DG
3183 break;
3184 case LTTNG_DOMAIN_UST:
3185 {
3186 if (session->ust_session != NULL) {
3187 nb_event = list_lttng_ust_global_events(channel_name,
3188 &session->ust_session->domain_global, events);
3189 }
3190 break;
54d01ffb 3191 }
b551a063
DG
3192 default:
3193 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
3194 goto error;
3195 }
3196
b551a063 3197 ret = nb_event;
54d01ffb
DG
3198
3199error:
3200 return ret;
3201}
3202
3203/*
3204 * Process the command requested by the lttng client within the command
3205 * context structure. This function make sure that the return structure (llm)
3206 * is set and ready for transmission before returning.
3207 *
3208 * Return any error encountered or 0 for success.
3209 */
3210static int process_client_msg(struct command_ctx *cmd_ctx)
3211{
3212 int ret = LTTCOMM_OK;
44d3bd01 3213 int need_tracing_session = 1;
54d01ffb
DG
3214
3215 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3216
4fba7219
DG
3217 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3218 ret = LTTCOMM_KERN_NA;
3219 goto error;
3220 }
3221
54d01ffb
DG
3222 /*
3223 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3224 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
3225 * command.
3226 */
3227 switch(cmd_ctx->lsm->cmd_type) {
3228 case LTTNG_LIST_SESSIONS:
3229 case LTTNG_LIST_TRACEPOINTS:
3230 case LTTNG_LIST_DOMAINS:
3231 case LTTNG_LIST_CHANNELS:
3232 case LTTNG_LIST_EVENTS:
3233 break;
3234 default:
3235 /* Setup lttng message with no payload */
3236 ret = setup_lttng_msg(cmd_ctx, 0);
3237 if (ret < 0) {
3238 /* This label does not try to unlock the session */
3239 goto init_setup_error;
3240 }
3241 }
3242
3243 /* Commands that DO NOT need a session. */
3244 switch (cmd_ctx->lsm->cmd_type) {
3245 case LTTNG_CALIBRATE:
3246 case LTTNG_CREATE_SESSION:
3247 case LTTNG_LIST_SESSIONS:
3248 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3249 need_tracing_session = 0;
54d01ffb
DG
3250 break;
3251 default:
3252 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3253 session_lock_list();
54d01ffb 3254 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3255 session_unlock_list();
54d01ffb
DG
3256 if (cmd_ctx->session == NULL) {
3257 if (cmd_ctx->lsm->session.name != NULL) {
3258 ret = LTTCOMM_SESS_NOT_FOUND;
3259 } else {
3260 /* If no session name specified */
3261 ret = LTTCOMM_SELECT_SESS;
3262 }
3263 goto error;
3264 } else {
3265 /* Acquire lock for the session */
3266 session_lock(cmd_ctx->session);
3267 }
3268 break;
3269 }
b389abbe 3270
54d01ffb
DG
3271 /*
3272 * Check domain type for specific "pre-action".
3273 */
3274 switch (cmd_ctx->lsm->domain.type) {
3275 case LTTNG_DOMAIN_KERNEL:
3276 /* Kernel tracer check */
3277 if (kernel_tracer_fd == 0) {
3278 /* Basically, load kernel tracer modules */
3279 init_kernel_tracer();
3280 if (kernel_tracer_fd == 0) {
3281 ret = LTTCOMM_KERN_NA;
3282 goto error;
3283 }
3284 }
5eb91c98 3285
54d01ffb 3286 /* Need a session for kernel command */
44d3bd01 3287 if (need_tracing_session) {
54d01ffb 3288 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3289 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3290 if (ret < 0) {
54d01ffb 3291 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
3292 goto error;
3293 }
b389abbe 3294 }
7d29a247 3295
54d01ffb 3296 /* Start the kernel consumer daemon */
3bd1e081
MD
3297 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3298 if (kconsumer_data.pid == 0 &&
54d01ffb 3299 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
3300 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3301 ret = start_consumerd(&kconsumer_data);
7d29a247 3302 if (ret < 0) {
54d01ffb
DG
3303 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3304 goto error;
950131af 3305 }
3ff2ecac
MD
3306 } else {
3307 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3308 }
0d0c377a 3309 }
54d01ffb 3310 break;
2bdd86d4 3311 case LTTNG_DOMAIN_UST:
44d3bd01 3312 {
44d3bd01 3313 if (need_tracing_session) {
f6a9efaa 3314 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3315 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3316 &cmd_ctx->lsm->domain);
44d3bd01
DG
3317 if (ret != LTTCOMM_OK) {
3318 goto error;
3319 }