Fix: thread_registration_apps should set its local sock to -1 when passing it
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
ca4537d3 20#include <fcntl.h>
fac6795d
DG
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
990570ed 41#include <common/common.h>
0ba98ebc 42#include <common/compat/poll.h>
db758600
DG
43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD
58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
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101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
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MD
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
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106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
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111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD
113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG
117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
a4b35e07
MD
125static int client_sock = -1;
126static int apps_sock = -1;
127static int kernel_tracer_fd = -1;
76d7553f 128static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 129
273ea72c
DG
130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
76d7553f 134static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 135
099e26bd
DG
136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
76d7553f 140static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG
150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG
159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD
171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fb6f1fa2
YB
174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD
178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD
207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD
225 }
226}
227
5eb91c98
DG
228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG
272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD
275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
ca4537d3 298 int ret;
273ea72c 299
ca4537d3 300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
273ea72c 301 if (ret < 0) {
76d7553f 302 PERROR("thread quit pipe");
273ea72c
DG
303 goto error;
304 }
305
306error:
307 return ret;
308}
309
fac6795d 310/*
d063d709
DG
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
fac6795d 313 */
1d4b027a 314static void teardown_kernel_session(struct ltt_session *session)
fac6795d 315{
8f7a84dd 316 if (!session->kernel_session) {
99bab54f 317 DBG3("No kernel session when tearing down session");
84ea9c99 318 return;
8f7a84dd
DG
319 }
320
84ea9c99 321 DBG("Tearing down kernel session");
d9800920 322
84ea9c99
MD
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 329 }
84ea9c99
MD
330
331 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
332}
333
f6a9efaa
DG
334/*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338static void teardown_ust_session(struct ltt_session *session)
339{
84cd17c6
MD
340 int ret;
341
8f7a84dd 342 if (!session->ust_session) {
99bab54f 343 DBG3("No UST session when tearing down session");
f470a390 344 return;
8f7a84dd
DG
345 }
346
84ea9c99 347 DBG("Tearing down UST session(s)");
8f7a84dd 348
84cd17c6
MD
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
8f7a84dd 353
f6a9efaa
DG
354 trace_ust_destroy_session(session->ust_session);
355}
356
099e26bd
DG
357/*
358 * Stop all threads by closing the thread quit pipe.
359 */
cf3af59e
MD
360static void stop_threads(void)
361{
5eb91c98
DG
362 int ret;
363
cf3af59e
MD
364 /* Stopping all threads */
365 DBG("Terminating all threads");
54d01ffb 366 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
099e26bd
DG
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
374}
375
fac6795d 376/*
d063d709 377 * Cleanup the daemon
fac6795d 378 */
cf3af59e 379static void cleanup(void)
fac6795d 380{
76d7553f 381 int ret, i;
1d4b027a 382 char *cmd;
af9737e9 383 struct ltt_session *sess, *stmp;
fac6795d 384
1d4b027a 385 DBG("Cleaning up");
e07ae692 386
67e40797
DG
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
5461b305 392
67e40797
DG
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
1d4b027a 397 }
67e40797 398 free(cmd);
5461b305 399
99bab54f 400 DBG("Cleaning up all sessions");
fac6795d 401
b5541356 402 /* Destroy session list mutex */
273ea72c
DG
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
54d01ffb
DG
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
273ea72c 409 teardown_kernel_session(sess);
f6a9efaa
DG
410 teardown_ust_session(sess);
411 free(sess);
273ea72c
DG
412 }
413 }
414
099e26bd 415 DBG("Closing all UST sockets");
56fff090 416 ust_app_clean_list();
099e26bd 417
3bd1e081 418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 419
4fba7219
DG
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
a4b35e07 422 if (kernel_tracer_fd >= 0) {
76d7553f
MD
423 ret = close(kernel_tracer_fd);
424 if (ret) {
425 PERROR("close");
426 }
a4b35e07 427 }
2f50c8a3 428 DBG("Unloading kernel modules");
096102bd 429 modprobe_remove_lttng_all();
2f50c8a3 430 }
5eb91c98 431
76d7553f
MD
432 /*
433 * Closing all pipes used for communication between threads.
434 */
435 for (i = 0; i < 2; i++) {
436 if (kernel_poll_pipe[i] >= 0) {
437 ret = close(kernel_poll_pipe[i]);
438 if (ret) {
439 PERROR("close");
440 }
441
442 }
443 }
444 for (i = 0; i < 2; i++) {
445 if (thread_quit_pipe[i] >= 0) {
446 ret = close(thread_quit_pipe[i]);
447 if (ret) {
448 PERROR("close");
449 }
450 }
451 }
452 for (i = 0; i < 2; i++) {
453 if (apps_cmd_pipe[i] >= 0) {
454 ret = close(apps_cmd_pipe[i]);
455 if (ret) {
456 PERROR("close");
457 }
458 }
459 }
421cb601
DG
460
461 /* <fun> */
f56a39af 462 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
463 "Matthew, BEET driven development works!%c[%dm",
464 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
465 /* </fun> */
fac6795d
DG
466}
467
e065084a 468/*
d063d709 469 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 470 *
d063d709 471 * Return lttcomm error code.
e065084a
DG
472 */
473static int send_unix_sock(int sock, void *buf, size_t len)
474{
475 /* Check valid length */
476 if (len <= 0) {
477 return -1;
478 }
479
480 return lttcomm_send_unix_sock(sock, buf, len);
481}
482
5461b305 483/*
d063d709 484 * Free memory of a command context structure.
5461b305 485 */
a2fb29a5 486static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 487{
a2fb29a5
DG
488 DBG("Clean command context structure");
489 if (*cmd_ctx) {
490 if ((*cmd_ctx)->llm) {
491 free((*cmd_ctx)->llm);
5461b305 492 }
a2fb29a5
DG
493 if ((*cmd_ctx)->lsm) {
494 free((*cmd_ctx)->lsm);
5461b305 495 }
a2fb29a5
DG
496 free(*cmd_ctx);
497 *cmd_ctx = NULL;
5461b305
DG
498 }
499}
500
f3ed775e 501/*
d063d709 502 * Send all stream fds of kernel channel to the consumer.
f3ed775e 503 */
2bdd86d4 504static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
505 int sock, struct ltt_kernel_channel *channel,
506 uid_t uid, gid_t gid)
f3ed775e
DG
507{
508 int ret;
f3ed775e 509 struct ltt_kernel_stream *stream;
3bd1e081 510 struct lttcomm_consumer_msg lkm;
f3ed775e 511
3bd1e081 512 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 513 channel->channel->name);
f3ed775e 514
3bd1e081
MD
515 /* Send channel */
516 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
517 lkm.u.channel.channel_key = channel->fd;
518 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
519 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 520 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 521 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 522 if (ret < 0) {
76d7553f 523 PERROR("send consumer channel");
f3ed775e
DG
524 goto error;
525 }
526
3bd1e081 527 /* Send streams */
7a485870 528 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
529 if (!stream->fd) {
530 continue;
531 }
532 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
533 lkm.u.stream.channel_key = channel->fd;
534 lkm.u.stream.stream_key = stream->fd;
535 lkm.u.stream.state = stream->state;
536 lkm.u.stream.output = channel->channel->attr.output;
537 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
538 lkm.u.stream.uid = uid;
539 lkm.u.stream.gid = gid;
3bd1e081
MD
540 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
541 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
542 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
543 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
544 if (ret < 0) {
76d7553f 545 PERROR("send consumer stream");
3bd1e081
MD
546 goto error;
547 }
548 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
549 if (ret < 0) {
76d7553f 550 PERROR("send consumer stream ancillary data");
3bd1e081 551 goto error;
f3ed775e
DG
552 }
553 }
554
3bd1e081 555 DBG("consumer channel streams sent");
f3ed775e
DG
556
557 return 0;
558
559error:
560 return ret;
561}
562
563/*
d063d709 564 * Send all stream fds of the kernel session to the consumer.
f3ed775e 565 */
2bdd86d4 566static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 567 struct ltt_kernel_session *session)
f3ed775e
DG
568{
569 int ret;
570 struct ltt_kernel_channel *chan;
3bd1e081
MD
571 struct lttcomm_consumer_msg lkm;
572 int sock = session->consumer_fd;
7a485870
DG
573
574 DBG("Sending metadata stream fd");
575
2bdd86d4 576 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 577 if (session->consumer_fd == 0) {
3bd1e081 578 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
579 }
580
7a485870 581 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
582 /* Send metadata channel fd */
583 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
584 lkm.u.channel.channel_key = session->metadata->fd;
585 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
586 lkm.u.channel.mmap_len = 0; /* for kernel */
587 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
588 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
589 if (ret < 0) {
76d7553f 590 PERROR("send consumer channel");
3bd1e081
MD
591 goto error;
592 }
593
594 /* Send metadata stream fd */
595 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
596 lkm.u.stream.channel_key = session->metadata->fd;
597 lkm.u.stream.stream_key = session->metadata_stream_fd;
598 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
599 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
600 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
601 lkm.u.stream.uid = session->uid;
602 lkm.u.stream.gid = session->gid;
3bd1e081
MD
603 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
604 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
605 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
606 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
607 if (ret < 0) {
76d7553f 608 PERROR("send consumer stream");
3bd1e081
MD
609 goto error;
610 }
611 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 612 if (ret < 0) {
76d7553f 613 PERROR("send consumer stream");
7a485870
DG
614 goto error;
615 }
616 }
f3ed775e 617
f3ed775e 618 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
619 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
620 session->uid, session->gid);
2bdd86d4
MD
621 if (ret < 0) {
622 goto error;
623 }
624 }
625
626 DBG("consumer fds (metadata and channel streams) sent");
627
628 return 0;
629
630error:
631 return ret;
632}
633
fac6795d 634/*
0fdd1e2c 635 * Notify UST applications using the shm mmap futex.
fac6795d 636 */
0fdd1e2c 637static int notify_ust_apps(int active)
fac6795d 638{
0fdd1e2c 639 char *wait_shm_mmap;
fac6795d 640
0fdd1e2c 641 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 642
0fdd1e2c
DG
643 /* See shm.c for this call implying mmap, shm and futex calls */
644 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
645 if (wait_shm_mmap == NULL) {
fac6795d
DG
646 goto error;
647 }
648
0fdd1e2c
DG
649 /* Wake waiting process */
650 futex_wait_update((int32_t *) wait_shm_mmap, active);
651
652 /* Apps notified successfully */
653 return 0;
fac6795d
DG
654
655error:
0fdd1e2c 656 return -1;
fac6795d
DG
657}
658
e065084a 659/*
d063d709
DG
660 * Setup the outgoing data buffer for the response (llm) by allocating the
661 * right amount of memory and copying the original information from the lsm
662 * structure.
ca95a216 663 *
d063d709 664 * Return total size of the buffer pointed by buf.
ca95a216 665 */
5461b305 666static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 667{
f3ed775e 668 int ret, buf_size;
ca95a216 669
f3ed775e 670 buf_size = size;
5461b305 671
ba7f0ae5 672 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 673 if (cmd_ctx->llm == NULL) {
76d7553f 674 PERROR("zmalloc");
5461b305 675 ret = -ENOMEM;
ca95a216
DG
676 goto error;
677 }
678
5461b305
DG
679 /* Copy common data */
680 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 681 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 682
5461b305
DG
683 cmd_ctx->llm->data_size = size;
684 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
685
ca95a216
DG
686 return buf_size;
687
688error:
689 return ret;
690}
691
7a485870 692/*
5eb91c98 693 * Update the kernel poll set of all channel fd available over all tracing
d063d709 694 * session. Add the wakeup pipe at the end of the set.
7a485870 695 */
5eb91c98 696static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 697{
5eb91c98 698 int ret;
7a485870
DG
699 struct ltt_session *session;
700 struct ltt_kernel_channel *channel;
701
5eb91c98 702 DBG("Updating kernel poll set");
7a485870 703
54d01ffb 704 session_lock_list();
b5541356 705 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 706 session_lock(session);
7a485870 707 if (session->kernel_session == NULL) {
54d01ffb 708 session_unlock(session);
7a485870
DG
709 continue;
710 }
7a485870 711
54d01ffb
DG
712 cds_list_for_each_entry(channel,
713 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
714 /* Add channel fd to the kernel poll set */
715 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
716 if (ret < 0) {
54d01ffb 717 session_unlock(session);
5eb91c98
DG
718 goto error;
719 }
720 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 721 }
54d01ffb 722 session_unlock(session);
7a485870 723 }
54d01ffb 724 session_unlock_list();
7a485870 725
5eb91c98 726 return 0;
7a485870
DG
727
728error:
54d01ffb 729 session_unlock_list();
7a485870
DG
730 return -1;
731}
732
733/*
54d01ffb 734 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 735 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 736 *
d063d709 737 * Useful for CPU hotplug feature.
7a485870 738 */
2bdd86d4 739static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
740{
741 int ret = 0;
742 struct ltt_session *session;
743 struct ltt_kernel_channel *channel;
744
745 DBG("Updating kernel streams for channel fd %d", fd);
746
54d01ffb 747 session_lock_list();
b5541356 748 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 749 session_lock(session);
7a485870 750 if (session->kernel_session == NULL) {
54d01ffb 751 session_unlock(session);
7a485870
DG
752 continue;
753 }
d9800920
DG
754
755 /* This is not suppose to be 0 but this is an extra security check */
756 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 757 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
758 }
759
5eb91c98
DG
760 cds_list_for_each_entry(channel,
761 &session->kernel_session->channel_list.head, list) {
7a485870
DG
762 if (channel->fd == fd) {
763 DBG("Channel found, updating kernel streams");
764 ret = kernel_open_channel_stream(channel);
765 if (ret < 0) {
b3c750d2 766 goto error;
7a485870 767 }
d9800920 768
7a485870 769 /*
5eb91c98
DG
770 * Have we already sent fds to the consumer? If yes, it means
771 * that tracing is started so it is safe to send our updated
772 * stream fds.
7a485870 773 */
3bd1e081 774 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 775 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
776 session->kernel_session->consumer_fd, channel,
777 session->uid, session->gid);
7a485870 778 if (ret < 0) {
b3c750d2 779 goto error;
7a485870
DG
780 }
781 }
b3c750d2 782 goto error;
7a485870
DG
783 }
784 }
54d01ffb 785 session_unlock(session);
7a485870 786 }
54d01ffb 787 session_unlock_list();
b3c750d2 788 return ret;
7a485870 789
b3c750d2 790error:
54d01ffb
DG
791 session_unlock(session);
792 session_unlock_list();
7a485870
DG
793 return ret;
794}
795
487cf67c
DG
796/*
797 * For each tracing session, update newly registered apps.
798 */
799static void update_ust_app(int app_sock)
800{
801 struct ltt_session *sess, *stmp;
802
4ee14516
DG
803 session_lock_list();
804
487cf67c
DG
805 /* For all tracing session(s) */
806 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 807 session_lock(sess);
421cb601
DG
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
4ee14516 811 session_unlock(sess);
487cf67c 812 }
4ee14516
DG
813
814 session_unlock_list();
487cf67c
DG
815}
816
7a485870 817/*
d063d709 818 * This thread manage event coming from the kernel.
7a485870 819 *
d063d709
DG
820 * Features supported in this thread:
821 * -) CPU Hotplug
7a485870
DG
822 */
823static void *thread_manage_kernel(void *data)
824{
5eb91c98
DG
825 int ret, i, pollfd, update_poll_flag = 1;
826 uint32_t revents, nb_fd;
7a485870 827 char tmp;
5eb91c98 828 struct lttng_poll_event events;
7a485870
DG
829
830 DBG("Thread manage kernel started");
831
5eb91c98
DG
832 ret = create_thread_poll_set(&events, 2);
833 if (ret < 0) {
76d7553f 834 goto error_poll_create;
5eb91c98
DG
835 }
836
837 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
838 if (ret < 0) {
839 goto error;
840 }
841
7a485870
DG
842 while (1) {
843 if (update_poll_flag == 1) {
5f822d0a
DG
844 /*
845 * Reset number of fd in the poll set. Always 2 since there is the thread
846 * quit pipe and the kernel pipe.
847 */
848 events.nb_fd = 2;
849
5eb91c98
DG
850 ret = update_kernel_poll(&events);
851 if (ret < 0) {
7a485870
DG
852 goto error;
853 }
854 update_poll_flag = 0;
855 }
856
5eb91c98
DG
857 nb_fd = LTTNG_POLL_GETNB(&events);
858
859 DBG("Thread kernel polling on %d fds", nb_fd);
860
861 /* Zeroed the poll events */
862 lttng_poll_reset(&events);
7a485870
DG
863
864 /* Poll infinite value of time */
a8b0b341 865 restart:
5eb91c98 866 ret = lttng_poll_wait(&events, -1);
7a485870 867 if (ret < 0) {
a8b0b341
MD
868 /*
869 * Restart interrupted system call.
870 */
871 if (errno == EINTR) {
872 goto restart;
873 }
7a485870
DG
874 goto error;
875 } else if (ret == 0) {
876 /* Should not happen since timeout is infinite */
85611738
DG
877 ERR("Return value of poll is 0 with an infinite timeout.\n"
878 "This should not have happened! Continuing...");
7a485870
DG
879 continue;
880 }
881
5eb91c98
DG
882 for (i = 0; i < nb_fd; i++) {
883 /* Fetch once the poll data */
884 revents = LTTNG_POLL_GETEV(&events, i);
885 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 886
5eb91c98
DG
887 /* Thread quit pipe has been closed. Killing thread. */
888 ret = check_thread_quit_pipe(pollfd, revents);
889 if (ret) {
890 goto error;
891 }
7a485870 892
5eb91c98
DG
893 /* Check for data on kernel pipe */
894 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
895 ret = read(kernel_poll_pipe[0], &tmp, 1);
896 update_poll_flag = 1;
897 continue;
898 } else {
899 /*
900 * New CPU detected by the kernel. Adding kernel stream to
901 * kernel session and updating the kernel consumer
902 */
903 if (revents & LPOLLIN) {
2bdd86d4 904 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
905 if (ret < 0) {
906 continue;
907 }
908 break;
909 /*
910 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
911 * and unregister kernel stream at this point.
912 */
7a485870 913 }
7a485870
DG
914 }
915 }
916 }
917
918error:
5eb91c98 919 lttng_poll_clean(&events);
76d7553f
MD
920error_poll_create:
921 DBG("Kernel thread dying");
7a485870
DG
922 return NULL;
923}
924
1d4b027a 925/*
3bd1e081 926 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 927 */
3bd1e081 928static void *thread_manage_consumer(void *data)
1d4b027a 929{
76d7553f 930 int sock = -1, i, ret, pollfd;
5eb91c98 931 uint32_t revents, nb_fd;
1d4b027a 932 enum lttcomm_return_code code;
5eb91c98 933 struct lttng_poll_event events;
3bd1e081 934 struct consumer_data *consumer_data = data;
1d4b027a 935
3bd1e081 936 DBG("[thread] Manage consumer started");
1d4b027a 937
3bd1e081 938 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a 939 if (ret < 0) {
76d7553f 940 goto error_listen;
1d4b027a
DG
941 }
942
5eb91c98
DG
943 /*
944 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
945 * Nothing more will be added to this poll set.
946 */
947 ret = create_thread_poll_set(&events, 2);
948 if (ret < 0) {
76d7553f 949 goto error_poll;
5eb91c98 950 }
273ea72c 951
3bd1e081 952 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
953 if (ret < 0) {
954 goto error;
955 }
956
957 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
958
959 /* Inifinite blocking call, waiting for transmission */
a8b0b341 960restart:
5eb91c98 961 ret = lttng_poll_wait(&events, -1);
273ea72c 962 if (ret < 0) {
a8b0b341
MD
963 /*
964 * Restart interrupted system call.
965 */
966 if (errno == EINTR) {
967 goto restart;
968 }
273ea72c
DG
969 goto error;
970 }
971
5eb91c98
DG
972 for (i = 0; i < nb_fd; i++) {
973 /* Fetch once the poll data */
974 revents = LTTNG_POLL_GETEV(&events, i);
975 pollfd = LTTNG_POLL_GETFD(&events, i);
976
977 /* Thread quit pipe has been closed. Killing thread. */
978 ret = check_thread_quit_pipe(pollfd, revents);
979 if (ret) {
980 goto error;
981 }
982
983 /* Event on the registration socket */
3bd1e081 984 if (pollfd == consumer_data->err_sock) {
5eb91c98 985 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 986 ERR("consumer err socket poll error");
5eb91c98
DG
987 goto error;
988 }
989 }
273ea72c
DG
990 }
991
3bd1e081 992 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
993 if (sock < 0) {
994 goto error;
995 }
996
3bd1e081 997 DBG2("Receiving code from consumer err_sock");
ee0b0061 998
712ea556 999 /* Getting status code from kconsumerd */
54d01ffb
DG
1000 ret = lttcomm_recv_unix_sock(sock, &code,
1001 sizeof(enum lttcomm_return_code));
1d4b027a
DG
1002 if (ret <= 0) {
1003 goto error;
1004 }
1005
3bd1e081
MD
1006 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1007 consumer_data->cmd_sock =
1008 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1009 if (consumer_data->cmd_sock < 0) {
1010 sem_post(&consumer_data->sem);
48842b30 1011 PERROR("consumer connect");
1d4b027a
DG
1012 goto error;
1013 }
1014 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1015 sem_post(&consumer_data->sem);
1016 DBG("consumer command socket ready");
1d4b027a 1017 } else {
3bd1e081 1018 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1019 lttcomm_get_readable_code(-code));
1020 goto error;
1021 }
1022
54d01ffb 1023 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1024 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1025 if (ret < 0) {
72079cae
DG
1026 goto error;
1027 }
1028
5eb91c98
DG
1029 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1030 if (ret < 0) {
72079cae 1031 goto error;
5eb91c98
DG
1032 }
1033
1034 /* Update number of fd */
1035 nb_fd = LTTNG_POLL_GETNB(&events);
1036
1037 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1038restart_poll:
5eb91c98
DG
1039 ret = lttng_poll_wait(&events, -1);
1040 if (ret < 0) {
a8b0b341
MD
1041 /*
1042 * Restart interrupted system call.
1043 */
1044 if (errno == EINTR) {
1045 goto restart_poll;
1046 }
72079cae
DG
1047 goto error;
1048 }
1049
5eb91c98
DG
1050 for (i = 0; i < nb_fd; i++) {
1051 /* Fetch once the poll data */
1052 revents = LTTNG_POLL_GETEV(&events, i);
1053 pollfd = LTTNG_POLL_GETFD(&events, i);
1054
1055 /* Thread quit pipe has been closed. Killing thread. */
1056 ret = check_thread_quit_pipe(pollfd, revents);
1057 if (ret) {
1058 goto error;
1059 }
1060
1061 /* Event on the kconsumerd socket */
1062 if (pollfd == sock) {
1063 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1064 ERR("consumer err socket second poll error");
5eb91c98
DG
1065 goto error;
1066 }
1067 }
1068 }
1069
712ea556 1070 /* Wait for any kconsumerd error */
54d01ffb
DG
1071 ret = lttcomm_recv_unix_sock(sock, &code,
1072 sizeof(enum lttcomm_return_code));
712ea556 1073 if (ret <= 0) {
3bd1e081 1074 ERR("consumer closed the command socket");
712ea556 1075 goto error;
6f61d021 1076 }
1d4b027a 1077
3bd1e081 1078 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1079
1d4b027a 1080error:
76d7553f
MD
1081 if (consumer_data->err_sock >= 0) {
1082 ret = close(consumer_data->err_sock);
1083 if (ret) {
1084 PERROR("close");
1085 }
1086 }
1087 if (consumer_data->cmd_sock >= 0) {
1088 ret = close(consumer_data->cmd_sock);
1089 if (ret) {
1090 PERROR("close");
1091 }
1092 }
1093 if (sock >= 0) {
1094 ret = close(sock);
1095 if (ret) {
1096 PERROR("close");
1097 }
1098 }
273ea72c 1099
3bd1e081
MD
1100 unlink(consumer_data->err_unix_sock_path);
1101 unlink(consumer_data->cmd_unix_sock_path);
1102 consumer_data->pid = 0;
1d4b027a 1103
5eb91c98 1104 lttng_poll_clean(&events);
76d7553f
MD
1105error_poll:
1106error_listen:
1107 DBG("consumer thread cleanup completed");
0177d773 1108
5eb91c98 1109 return NULL;
099e26bd
DG
1110}
1111
099e26bd
DG
1112/*
1113 * This thread manage application communication.
1d4b027a
DG
1114 */
1115static void *thread_manage_apps(void *data)
099e26bd 1116{
5eb91c98
DG
1117 int i, ret, pollfd;
1118 uint32_t revents, nb_fd;
099e26bd 1119 struct ust_command ust_cmd;
5eb91c98 1120 struct lttng_poll_event events;
099e26bd
DG
1121
1122 DBG("[thread] Manage application started");
1123
f6a9efaa
DG
1124 rcu_register_thread();
1125 rcu_thread_online();
1126
5eb91c98
DG
1127 ret = create_thread_poll_set(&events, 2);
1128 if (ret < 0) {
76d7553f 1129 goto error_poll_create;
5eb91c98 1130 }
099e26bd 1131
5eb91c98
DG
1132 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1133 if (ret < 0) {
1134 goto error;
1135 }
099e26bd 1136
5eb91c98
DG
1137 while (1) {
1138 /* Zeroed the events structure */
1139 lttng_poll_reset(&events);
0177d773 1140
5eb91c98 1141 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1142
1143 DBG("Apps thread polling on %d fds", nb_fd);
1144
1145 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1146 restart:
5eb91c98 1147 ret = lttng_poll_wait(&events, -1);
099e26bd 1148 if (ret < 0) {
a8b0b341
MD
1149 /*
1150 * Restart interrupted system call.
1151 */
1152 if (errno == EINTR) {
1153 goto restart;
1154 }
099e26bd
DG
1155 goto error;
1156 }
1157
5eb91c98
DG
1158 for (i = 0; i < nb_fd; i++) {
1159 /* Fetch once the poll data */
1160 revents = LTTNG_POLL_GETEV(&events, i);
1161 pollfd = LTTNG_POLL_GETFD(&events, i);
1162
1163 /* Thread quit pipe has been closed. Killing thread. */
1164 ret = check_thread_quit_pipe(pollfd, revents);
1165 if (ret) {
099e26bd 1166 goto error;
5eb91c98 1167 }
099e26bd 1168
5eb91c98
DG
1169 /* Inspect the apps cmd pipe */
1170 if (pollfd == apps_cmd_pipe[0]) {
1171 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1172 ERR("Apps command pipe error");
0177d773 1173 goto error;
5eb91c98
DG
1174 } else if (revents & LPOLLIN) {
1175 /* Empty pipe */
1176 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1177 if (ret < 0 || ret < sizeof(ust_cmd)) {
76d7553f 1178 PERROR("read apps cmd pipe");
5eb91c98
DG
1179 goto error;
1180 }
099e26bd 1181
5eb91c98 1182 /* Register applicaton to the session daemon */
56fff090 1183 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1184 ust_cmd.sock);
88ff5b7f 1185 if (ret == -ENOMEM) {
5eb91c98 1186 goto error;
88ff5b7f
MD
1187 } else if (ret < 0) {
1188 break;
5eb91c98
DG
1189 }
1190
acc7b41b 1191 /*
e0c7ec2b 1192 * Validate UST version compatibility.
acc7b41b 1193 */
e0c7ec2b
DG
1194 ret = ust_app_validate_version(ust_cmd.sock);
1195 if (ret >= 0) {
1196 /*
1197 * Add channel(s) and event(s) to newly registered apps
1198 * from lttng global UST domain.
1199 */
1200 update_ust_app(ust_cmd.sock);
1201 }
acc7b41b 1202
f2ca2e25 1203 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1204 if (ret < 0) {
1205 /*
1206 * If the registration is not possible, we simply
1207 * unregister the apps and continue
1208 */
56fff090 1209 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1210 } else {
1211 /*
1212 * We just need here to monitor the close of the UST
1213 * socket and poll set monitor those by default.
ab08a675
MD
1214 * Listen on POLLIN (even if we never expect any
1215 * data) to ensure that hangup wakes us.
5eb91c98 1216 */
ab08a675 1217 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1218 if (ret < 0) {
1219 goto error;
1220 }
1221
54d01ffb
DG
1222 DBG("Apps with sock %d added to poll set",
1223 ust_cmd.sock);
5eb91c98 1224 }
487cf67c 1225
5eb91c98 1226 break;
0177d773 1227 }
5eb91c98
DG
1228 } else {
1229 /*
54d01ffb
DG
1230 * At this point, we know that a registered application made
1231 * the event at poll_wait.
5eb91c98
DG
1232 */
1233 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1234 /* Removing from the poll set */
1235 ret = lttng_poll_del(&events, pollfd);
1236 if (ret < 0) {
1237 goto error;
1238 }
099e26bd 1239
b9d9b220 1240 /* Socket closed on remote end. */
56fff090 1241 ust_app_unregister(pollfd);
5eb91c98
DG
1242 break;
1243 }
099e26bd
DG
1244 }
1245 }
099e26bd
DG
1246 }
1247
1248error:
5eb91c98 1249 lttng_poll_clean(&events);
76d7553f
MD
1250error_poll_create:
1251 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1252 rcu_thread_offline();
1253 rcu_unregister_thread();
099e26bd
DG
1254 return NULL;
1255}
1256
1257/*
1258 * Dispatch request from the registration threads to the application
1259 * communication thread.
1260 */
1261static void *thread_dispatch_ust_registration(void *data)
1262{
1263 int ret;
1264 struct cds_wfq_node *node;
1265 struct ust_command *ust_cmd = NULL;
1266
1267 DBG("[thread] Dispatch UST command started");
1268
1269 while (!dispatch_thread_exit) {
1270 /* Atomically prepare the queue futex */
1271 futex_nto1_prepare(&ust_cmd_queue.futex);
1272
1273 do {
1274 /* Dequeue command for registration */
1275 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1276 if (node == NULL) {
00a17c97 1277 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1278 /* Continue thread execution */
1279 break;
1280 }
1281
1282 ust_cmd = caa_container_of(node, struct ust_command, node);
1283
2f50c8a3
DG
1284 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1285 " gid:%d sock:%d name:%s (version %d.%d)",
1286 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1287 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1288 ust_cmd->sock, ust_cmd->reg_msg.name,
1289 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1290 /*
1291 * Inform apps thread of the new application registration. This
1292 * call is blocking so we can be assured that the data will be read
1293 * at some point in time or wait to the end of the world :)
1294 */
1295 ret = write(apps_cmd_pipe[1], ust_cmd,
1296 sizeof(struct ust_command));
1297 if (ret < 0) {
76d7553f 1298 PERROR("write apps cmd pipe");
099e26bd
DG
1299 if (errno == EBADF) {
1300 /*
1301 * We can't inform the application thread to process
1302 * registration. We will exit or else application
1303 * registration will not occur and tracing will never
1304 * start.
1305 */
1306 goto error;
1307 }
1308 }
1309 free(ust_cmd);
1310 } while (node != NULL);
1311
1312 /* Futex wait on queue. Blocking call on futex() */
1313 futex_nto1_wait(&ust_cmd_queue.futex);
1314 }
1315
1316error:
1317 DBG("Dispatch thread dying");
1318 return NULL;
1319}
1320
1321/*
1322 * This thread manage application registration.
1323 */
1324static void *thread_registration_apps(void *data)
1d4b027a 1325{
a4b35e07 1326 int sock = -1, i, ret, pollfd;
5eb91c98
DG
1327 uint32_t revents, nb_fd;
1328 struct lttng_poll_event events;
099e26bd
DG
1329 /*
1330 * Get allocated in this thread, enqueued to a global queue, dequeued and
1331 * freed in the manage apps thread.
1332 */
1333 struct ust_command *ust_cmd = NULL;
1d4b027a 1334
099e26bd 1335 DBG("[thread] Manage application registration started");
1d4b027a
DG
1336
1337 ret = lttcomm_listen_unix_sock(apps_sock);
1338 if (ret < 0) {
76d7553f 1339 goto error_listen;
1d4b027a
DG
1340 }
1341
5eb91c98
DG
1342 /*
1343 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1344 * more will be added to this poll set.
1345 */
1346 ret = create_thread_poll_set(&events, 2);
1347 if (ret < 0) {
76d7553f 1348 goto error_create_poll;
5eb91c98 1349 }
273ea72c 1350
5eb91c98
DG
1351 /* Add the application registration socket */
1352 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1353 if (ret < 0) {
76d7553f 1354 goto error_poll_add;
5eb91c98 1355 }
273ea72c 1356
1d4b027a 1357 /* Notify all applications to register */
0fdd1e2c
DG
1358 ret = notify_ust_apps(1);
1359 if (ret < 0) {
1360 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1361 "Execution continues but there might be problem for already\n"
1362 "running applications that wishes to register.");
0fdd1e2c 1363 }
1d4b027a
DG
1364
1365 while (1) {
1366 DBG("Accepting application registration");
273ea72c 1367
5eb91c98
DG
1368 nb_fd = LTTNG_POLL_GETNB(&events);
1369
273ea72c 1370 /* Inifinite blocking call, waiting for transmission */
a8b0b341 1371 restart:
5eb91c98 1372 ret = lttng_poll_wait(&events, -1);
273ea72c 1373 if (ret < 0) {
a8b0b341
MD
1374 /*
1375 * Restart interrupted system call.
1376 */
1377 if (errno == EINTR) {
1378 goto restart;
1379 }
273ea72c
DG
1380 goto error;
1381 }
1382
5eb91c98
DG
1383 for (i = 0; i < nb_fd; i++) {
1384 /* Fetch once the poll data */
1385 revents = LTTNG_POLL_GETEV(&events, i);
1386 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1387
5eb91c98
DG
1388 /* Thread quit pipe has been closed. Killing thread. */
1389 ret = check_thread_quit_pipe(pollfd, revents);
1390 if (ret) {
90014c57
DG
1391 goto error;
1392 }
1d4b027a 1393
5eb91c98
DG
1394 /* Event on the registration socket */
1395 if (pollfd == apps_sock) {
1396 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1397 ERR("Register apps socket poll error");
1398 goto error;
1399 } else if (revents & LPOLLIN) {
1400 sock = lttcomm_accept_unix_sock(apps_sock);
1401 if (sock < 0) {
1402 goto error;
1403 }
099e26bd 1404
5eb91c98 1405 /* Create UST registration command for enqueuing */
ba7f0ae5 1406 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1407 if (ust_cmd == NULL) {
76d7553f 1408 PERROR("ust command zmalloc");
5eb91c98
DG
1409 goto error;
1410 }
1d4b027a 1411
5eb91c98
DG
1412 /*
1413 * Using message-based transmissions to ensure we don't
1414 * have to deal with partially received messages.
1415 */
1416 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1417 sizeof(struct ust_register_msg));
1418 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1419 if (ret < 0) {
76d7553f 1420 PERROR("lttcomm_recv_unix_sock register apps");
5eb91c98
DG
1421 } else {
1422 ERR("Wrong size received on apps register");
1423 }
1424 free(ust_cmd);
76d7553f
MD
1425 ret = close(sock);
1426 if (ret) {
1427 PERROR("close");
1428 }
1429 sock = -1;
5eb91c98
DG
1430 continue;
1431 }
099e26bd 1432
5eb91c98 1433 ust_cmd->sock = sock;
34a2494f 1434 sock = -1;
099e26bd 1435
5eb91c98
DG
1436 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1437 " gid:%d sock:%d name:%s (version %d.%d)",
1438 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1439 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1440 ust_cmd->sock, ust_cmd->reg_msg.name,
1441 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1442
5eb91c98
DG
1443 /*
1444 * Lock free enqueue the registration request. The red pill
54d01ffb 1445 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1446 */
1447 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1448
1449 /*
1450 * Wake the registration queue futex. Implicit memory
1451 * barrier with the exchange in cds_wfq_enqueue.
1452 */
1453 futex_nto1_wake(&ust_cmd_queue.futex);
1454 }
1455 }
90014c57 1456 }
1d4b027a
DG
1457 }
1458
1459error:
0fdd1e2c
DG
1460 /* Notify that the registration thread is gone */
1461 notify_ust_apps(0);
1462
a4b35e07 1463 if (apps_sock >= 0) {
76d7553f
MD
1464 ret = close(apps_sock);
1465 if (ret) {
1466 PERROR("close");
1467 }
a4b35e07 1468 }
46c3f085 1469 if (sock >= 0) {
76d7553f
MD
1470 ret = close(sock);
1471 if (ret) {
1472 PERROR("close");
1473 }
a4b35e07 1474 }
273ea72c 1475 unlink(apps_unix_sock_path);
0fdd1e2c 1476
76d7553f 1477error_poll_add:
5eb91c98 1478 lttng_poll_clean(&events);
76d7553f
MD
1479error_listen:
1480error_create_poll:
1481 DBG("UST Registration thread cleanup complete");
5eb91c98 1482
1d4b027a
DG
1483 return NULL;
1484}
1485
8c0faa1d 1486/*
3bd1e081 1487 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1488 * exec or it will fails.
8c0faa1d 1489 */
3bd1e081 1490static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1491{
1492 int ret;
ee0b0061
DG
1493 struct timespec timeout;
1494
1495 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1496 timeout.tv_nsec = 0;
8c0faa1d
DG
1497
1498 /* Setup semaphore */
3bd1e081 1499 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1500 if (ret < 0) {
3bd1e081 1501 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1502 goto error;
1503 }
8c0faa1d 1504
3bd1e081
MD
1505 ret = pthread_create(&consumer_data->thread, NULL,
1506 thread_manage_consumer, consumer_data);
8c0faa1d 1507 if (ret != 0) {
3bd1e081 1508 PERROR("pthread_create consumer");
ee0b0061 1509 ret = -1;
8c0faa1d
DG
1510 goto error;
1511 }
1512
ee0b0061
DG
1513 /* Get time for sem_timedwait absolute timeout */
1514 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1515 if (ret < 0) {
3bd1e081 1516 PERROR("clock_gettime spawn consumer");
ee0b0061 1517 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1518 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1519 } else {
1520 /* Normal timeout if the gettime was successful */
1521 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1522 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1523 }
8c0faa1d 1524
ee0b0061
DG
1525 if (ret < 0) {
1526 if (errno == ETIMEDOUT) {
1527 /*
1528 * Call has timed out so we kill the kconsumerd_thread and return
1529 * an error.
1530 */
3bd1e081
MD
1531 ERR("The consumer thread was never ready. Killing it");
1532 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1533 if (ret < 0) {
3bd1e081 1534 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1535 }
1536 } else {
3bd1e081 1537 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1538 }
1539 goto error;
1540 }
1541
3bd1e081
MD
1542 pthread_mutex_lock(&consumer_data->pid_mutex);
1543 if (consumer_data->pid == 0) {
712ea556 1544 ERR("Kconsumerd did not start");
3bd1e081 1545 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1546 goto error;
1547 }
3bd1e081 1548 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1549
8c0faa1d
DG
1550 return 0;
1551
1552error:
1553 return ret;
1554}
1555
d9800920 1556/*
3bd1e081 1557 * Join consumer thread
d9800920 1558 */
3bd1e081 1559static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1560{
1561 void *status;
1562 int ret;
1563
3bd1e081
MD
1564 if (consumer_data->pid != 0) {
1565 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1566 if (ret) {
3bd1e081 1567 ERR("Error killing consumer daemon");
cf3af59e
MD
1568 return ret;
1569 }
3bd1e081 1570 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1571 } else {
1572 return 0;
1573 }
1574}
1575
8c0faa1d 1576/*
3bd1e081 1577 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1578 *
d063d709 1579 * Return pid if successful else -1.
8c0faa1d 1580 */
3bd1e081 1581static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1582{
1583 int ret;
1584 pid_t pid;
94c55f17 1585 const char *consumer_to_use;
53086306 1586 const char *verbosity;
94c55f17 1587 struct stat st;
8c0faa1d 1588
3bd1e081 1589 DBG("Spawning consumerd");
c49dc785 1590
8c0faa1d
DG
1591 pid = fork();
1592 if (pid == 0) {
1593 /*
3bd1e081 1594 * Exec consumerd.
8c0faa1d 1595 */
daee5345 1596 if (opt_verbose_consumer) {
53086306
DG
1597 verbosity = "--verbose";
1598 } else {
1599 verbosity = "--quiet";
1600 }
3bd1e081
MD
1601 switch (consumer_data->type) {
1602 case LTTNG_CONSUMER_KERNEL:
94c55f17 1603 /*
c7704d57
DG
1604 * Find out which consumerd to execute. We will first try the
1605 * 64-bit path, then the sessiond's installation directory, and
1606 * fallback on the 32-bit one,
94c55f17 1607 */
63a799e8
AM
1608 DBG3("Looking for a kernel consumer at these locations:");
1609 DBG3(" 1) %s", consumerd64_bin);
1610 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1611 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1612 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1613 DBG3("Found location #1");
94c55f17 1614 consumer_to_use = consumerd64_bin;
94c55f17 1615 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1616 DBG3("Found location #2");
94c55f17 1617 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1618 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1619 DBG3("Found location #3");
eb1e0bd4 1620 consumer_to_use = consumerd32_bin;
94c55f17 1621 } else {
63a799e8 1622 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1623 break;
1624 }
1625 DBG("Using kernel consumer at: %s", consumer_to_use);
1626 execl(consumer_to_use,
1627 "lttng-consumerd", verbosity, "-k",
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
3bd1e081 1631 break;
7753dea8
MD
1632 case LTTNG_CONSUMER64_UST:
1633 {
b1e0b6b6 1634 char *tmpnew = NULL;
8f4905da
MD
1635
1636 if (consumerd64_libdir[0] != '\0') {
1637 char *tmp;
1638 size_t tmplen;
1639
1640 tmp = getenv("LD_LIBRARY_PATH");
1641 if (!tmp) {
1642 tmp = "";
1643 }
1644 tmplen = strlen("LD_LIBRARY_PATH=")
1645 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1646 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1647 if (!tmpnew) {
1648 ret = -ENOMEM;
1649 goto error;
1650 }
1651 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1652 strcat(tmpnew, consumerd64_libdir);
1653 if (tmp[0] != '\0') {
1654 strcat(tmpnew, ":");
1655 strcat(tmpnew, tmp);
1656 }
1657 ret = putenv(tmpnew);
1658 if (ret) {
1659 ret = -errno;
1660 goto error;
1661 }
1662 }
94c55f17 1663 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1664 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1665 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1666 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1667 NULL);
8f4905da
MD
1668 if (consumerd64_libdir[0] != '\0') {
1669 free(tmpnew);
1670 }
1671 if (ret) {
1672 goto error;
1673 }
3bd1e081 1674 break;
7753dea8
MD
1675 }
1676 case LTTNG_CONSUMER32_UST:
1677 {
937dde8e 1678 char *tmpnew = NULL;
8f4905da
MD
1679
1680 if (consumerd32_libdir[0] != '\0') {
1681 char *tmp;
1682 size_t tmplen;
1683
1684 tmp = getenv("LD_LIBRARY_PATH");
1685 if (!tmp) {
1686 tmp = "";
1687 }
1688 tmplen = strlen("LD_LIBRARY_PATH=")
1689 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1690 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1691 if (!tmpnew) {
1692 ret = -ENOMEM;
1693 goto error;
1694 }
1695 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1696 strcat(tmpnew, consumerd32_libdir);
1697 if (tmp[0] != '\0') {
1698 strcat(tmpnew, ":");
1699 strcat(tmpnew, tmp);
1700 }
1701 ret = putenv(tmpnew);
1702 if (ret) {
1703 ret = -errno;
1704 goto error;
1705 }
1706 }
94c55f17 1707 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1708 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1709 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1710 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1711 NULL);
8f4905da
MD
1712 if (consumerd32_libdir[0] != '\0') {
1713 free(tmpnew);
1714 }
1715 if (ret) {
1716 goto error;
1717 }
7753dea8
MD
1718 break;
1719 }
3bd1e081 1720 default:
76d7553f 1721 PERROR("unknown consumer type");
3bd1e081
MD
1722 exit(EXIT_FAILURE);
1723 }
8c0faa1d 1724 if (errno != 0) {
76d7553f 1725 PERROR("kernel start consumer exec");
8c0faa1d
DG
1726 }
1727 exit(EXIT_FAILURE);
1728 } else if (pid > 0) {
1729 ret = pid;
8c0faa1d 1730 } else {
76d7553f 1731 PERROR("start consumer fork");
8c0faa1d 1732 ret = -errno;
8c0faa1d 1733 }
8f4905da 1734error:
8c0faa1d
DG
1735 return ret;
1736}
1737
693bd40b 1738/*
3bd1e081 1739 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1740 */
3bd1e081 1741static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1742{
1743 int ret;
1744
3bd1e081
MD
1745 pthread_mutex_lock(&consumer_data->pid_mutex);
1746 if (consumer_data->pid != 0) {
1747 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1748 goto end;
1749 }
693bd40b 1750
3bd1e081 1751 ret = spawn_consumerd(consumer_data);
c49dc785 1752 if (ret < 0) {
3bd1e081
MD
1753 ERR("Spawning consumerd failed");
1754 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1755 goto error;
693bd40b 1756 }
c49dc785 1757
3bd1e081
MD
1758 /* Setting up the consumer_data pid */
1759 consumer_data->pid = ret;
48842b30 1760 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1761 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1762
3bd1e081
MD
1763 DBG2("Spawning consumer control thread");
1764 ret = spawn_consumer_thread(consumer_data);
693bd40b 1765 if (ret < 0) {
3bd1e081 1766 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1767 goto error;
1768 }
1769
c49dc785 1770end:
693bd40b
DG
1771 return 0;
1772
1773error:
1774 return ret;
1775}
1776
b73401da 1777/*
096102bd 1778 * Check version of the lttng-modules.
b73401da 1779 */
096102bd 1780static int validate_lttng_modules_version(void)
b73401da 1781{
096102bd 1782 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1783}
1784
b73401da 1785/*
096102bd 1786 * Setup necessary data for kernel tracer action.
b73401da 1787 */
096102bd 1788static int init_kernel_tracer(void)
b73401da
DG
1789{
1790 int ret;
b73401da 1791
096102bd
DG
1792 /* Modprobe lttng kernel modules */
1793 ret = modprobe_lttng_control();
b73401da 1794 if (ret < 0) {
b73401da
DG
1795 goto error;
1796 }
1797
096102bd
DG
1798 /* Open debugfs lttng */
1799 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1800 if (kernel_tracer_fd < 0) {
1801 DBG("Failed to open %s", module_proc_lttng);
1802 ret = -1;
1803 goto error_open;
b73401da
DG
1804 }
1805
096102bd
DG
1806 /* Validate kernel version */
1807 ret = validate_lttng_modules_version();
b73401da 1808 if (ret < 0) {
096102bd 1809 goto error_version;
b73401da
DG
1810 }
1811
096102bd 1812 ret = modprobe_lttng_data();
b73401da 1813 if (ret < 0) {
096102bd 1814 goto error_modules;
8c0faa1d
DG
1815 }
1816
f3ed775e 1817 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1818 return 0;
1819
1820error_version:
1821 modprobe_remove_lttng_control();
76d7553f
MD
1822 ret = close(kernel_tracer_fd);
1823 if (ret) {
1824 PERROR("close");
1825 }
1826 kernel_tracer_fd = -1;
096102bd
DG
1827 return LTTCOMM_KERN_VERSION;
1828
1829error_modules:
76d7553f
MD
1830 ret = close(kernel_tracer_fd);
1831 if (ret) {
1832 PERROR("close");
1833 }
096102bd
DG
1834
1835error_open:
1836 modprobe_remove_lttng_control();
b73401da
DG
1837
1838error:
b73401da 1839 WARN("No kernel tracer available");
a4b35e07 1840 kernel_tracer_fd = -1;
096102bd 1841 return LTTCOMM_KERN_NA;
f3ed775e 1842}
33a2b854 1843
f3ed775e 1844/*
54d01ffb 1845 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1846 */
54d01ffb 1847static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1848{
f40799e8 1849 int ret = 0;
8c0faa1d 1850
3bd1e081 1851 if (session->consumer_fds_sent == 0) {
d9800920 1852 /*
54d01ffb
DG
1853 * Assign default kernel consumer socket if no consumer assigned to the
1854 * kernel session. At this point, it's NOT suppose to be 0 but this is
1855 * an extra security check.
d9800920
DG
1856 */
1857 if (session->consumer_fd == 0) {
3bd1e081 1858 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1859 }
1860
2bdd86d4 1861 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1862 if (ret < 0) {
f3ed775e
DG
1863 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1864 goto error;
1865 }
1d4b027a 1866
3bd1e081 1867 session->consumer_fds_sent = 1;
f3ed775e 1868 }
1d4b027a
DG
1869
1870error:
1871 return ret;
8c0faa1d
DG
1872}
1873
0177d773
DG
1874/*
1875 * Create an UST session and add it to the session ust list.
1876 */
44d3bd01 1877static int create_ust_session(struct ltt_session *session,
6df2e2c9 1878 struct lttng_domain *domain)
0177d773 1879{
13384287 1880 struct ltt_ust_session *lus = NULL;
6df2e2c9 1881 int ret;
44d3bd01
DG
1882
1883 switch (domain->type) {
48842b30 1884 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1885 break;
1886 default:
13384287 1887 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1888 goto error;
1889 }
0177d773
DG
1890
1891 DBG("Creating UST session");
1892
a991f516 1893 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1894 if (lus == NULL) {
44d3bd01 1895 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1896 goto error;
1897 }
1898
e11d277b 1899 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1900 session->uid, session->gid);
0177d773
DG
1901 if (ret < 0) {
1902 if (ret != -EEXIST) {
1903 ERR("Trace directory creation error");
44d3bd01 1904 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1905 goto error;
1906 }
1907 }
1908
f6a9efaa
DG
1909 /* The domain type dictate different actions on session creation */
1910 switch (domain->type) {
48842b30
DG
1911 case LTTNG_DOMAIN_UST:
1912 /* No ustctl for the global UST domain */
1913 break;
1914 default:
36dc12cc 1915 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1916 goto error;
0177d773 1917 }
6df2e2c9
MD
1918 lus->uid = session->uid;
1919 lus->gid = session->gid;
f6a9efaa 1920 session->ust_session = lus;
44d3bd01
DG
1921
1922 return LTTCOMM_OK;
0177d773
DG
1923
1924error:
1925 free(lus);
1926 return ret;
1927}
1928
333f285e 1929/*
d063d709 1930 * Create a kernel tracer session then create the default channel.
333f285e 1931 */
6df2e2c9 1932static int create_kernel_session(struct ltt_session *session)
333f285e 1933{
f3ed775e 1934 int ret;
f3ed775e
DG
1935
1936 DBG("Creating kernel session");
1937
1938 ret = kernel_create_session(session, kernel_tracer_fd);
1939 if (ret < 0) {
1940 ret = LTTCOMM_KERN_SESS_FAIL;
1941 goto error;
333f285e
DG
1942 }
1943
d9800920 1944 /* Set kernel consumer socket fd */
3bd1e081
MD
1945 if (kconsumer_data.cmd_sock) {
1946 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1947 }
1948
e11d277b 1949 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1950 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1951 if (ret < 0) {
996b65c8 1952 if (ret != -EEXIST) {
7a485870
DG
1953 ERR("Trace directory creation error");
1954 goto error;
1955 }
1956 }
6df2e2c9
MD
1957 session->kernel_session->uid = session->uid;
1958 session->kernel_session->gid = session->gid;
7a485870 1959
f3ed775e
DG
1960error:
1961 return ret;
333f285e
DG
1962}
1963
8e0af1b4 1964/*
c7704d57
DG
1965 * Check if the UID or GID match the session. Root user has access to all
1966 * sessions.
8e0af1b4 1967 */
c7704d57 1968static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1969{
c7704d57 1970 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
1971 return 0;
1972 } else {
1973 return 1;
1974 }
1975}
1976
1977static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1978{
1979 unsigned int i = 0;
1980 struct ltt_session *session;
1981
1982 DBG("Counting number of available session for UID %d GID %d",
1983 uid, gid);
1984 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1985 /*
1986 * Only list the sessions the user can control.
1987 */
1988 if (!session_access_ok(session, uid, gid)) {
1989 continue;
1990 }
1991 i++;
1992 }
1993 return i;
1994}
1995
6c9cc2ab
DG
1996/*
1997 * Using the session list, filled a lttng_session array to send back to the
1998 * client for session listing.
1999 *
2000 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2001 * session_lock_list() and session_unlock_list().
6c9cc2ab 2002 */
c7704d57
DG
2003static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2004 gid_t gid)
6c9cc2ab 2005{
8e0af1b4 2006 unsigned int i = 0;
6c9cc2ab
DG
2007 struct ltt_session *session;
2008
8e0af1b4
MD
2009 DBG("Getting all available session for UID %d GID %d",
2010 uid, gid);
6c9cc2ab
DG
2011 /*
2012 * Iterate over session list and append data after the control struct in
2013 * the buffer.
2014 */
2015 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
2016 /*
2017 * Only list the sessions the user can control.
2018 */
2019 if (!session_access_ok(session, uid, gid)) {
2020 continue;
2021 }
6c9cc2ab 2022 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2023 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2024 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2025 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2026 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
2027 i++;
2028 }
2029}
2030
9f19cc17
DG
2031/*
2032 * Fill lttng_channel array of all channels.
2033 */
b551a063 2034static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2035 struct lttng_channel *channels)
2036{
2037 int i = 0;
2038 struct ltt_kernel_channel *kchan;
2039
2040 DBG("Listing channels for session %s", session->name);
2041
b551a063
DG
2042 switch (domain) {
2043 case LTTNG_DOMAIN_KERNEL:
2044 /* Kernel channels */
2045 if (session->kernel_session != NULL) {
2046 cds_list_for_each_entry(kchan,
2047 &session->kernel_session->channel_list.head, list) {
2048 /* Copy lttng_channel struct to array */
2049 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2050 channels[i].enabled = kchan->enabled;
2051 i++;
2052 }
2053 }
2054 break;
2055 case LTTNG_DOMAIN_UST:
2056 {
bec39940 2057 struct lttng_ht_iter iter;
b551a063
DG
2058 struct ltt_ust_channel *uchan;
2059
bec39940
DG
2060 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2061 &iter.iter, uchan, node.node) {
b551a063
DG
2062 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2063 channels[i].attr.overwrite = uchan->attr.overwrite;
2064 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2065 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2066 channels[i].attr.switch_timer_interval =
2067 uchan->attr.switch_timer_interval;
2068 channels[i].attr.read_timer_interval =
2069 uchan->attr.read_timer_interval;
aea829b3 2070 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2071 switch (uchan->attr.output) {
2072 case LTTNG_UST_MMAP:
2073 default:
2074 channels[i].attr.output = LTTNG_EVENT_MMAP;
2075 break;
2076 }
befe0905 2077 i++;
b551a063
DG
2078 }
2079 break;
2080 }
2081 default:
2082 break;
2083 }
2084}
2085
2086/*
2087 * Create a list of ust global domain events.
2088 */
2089static int list_lttng_ust_global_events(char *channel_name,
2090 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2091{
2092 int i = 0, ret = 0;
2093 unsigned int nb_event = 0;
bec39940
DG
2094 struct lttng_ht_iter iter;
2095 struct lttng_ht_node_str *node;
b551a063
DG
2096 struct ltt_ust_channel *uchan;
2097 struct ltt_ust_event *uevent;
2098 struct lttng_event *tmp;
2099
2100 DBG("Listing UST global events for channel %s", channel_name);
2101
2102 rcu_read_lock();
2103
bec39940
DG
2104 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2105 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2106 if (node == NULL) {
2107 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2108 goto error;
b551a063
DG
2109 }
2110
bec39940 2111 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2112
bec39940 2113 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2114
b551a063
DG
2115 if (nb_event == 0) {
2116 ret = nb_event;
2117 goto error;
2118 }
2119
2120 DBG3("Listing UST global %d events", nb_event);
2121
2122 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2123 if (tmp == NULL) {
2124 ret = -LTTCOMM_FATAL;
2125 goto error;
2126 }
2127
bec39940 2128 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2129 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2130 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2131 tmp[i].enabled = uevent->enabled;
2132 switch (uevent->attr.instrumentation) {
2133 case LTTNG_UST_TRACEPOINT:
2134 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2135 break;
2136 case LTTNG_UST_PROBE:
2137 tmp[i].type = LTTNG_EVENT_PROBE;
2138 break;
2139 case LTTNG_UST_FUNCTION:
2140 tmp[i].type = LTTNG_EVENT_FUNCTION;
2141 break;
0cda4f28 2142 }
8005f29a 2143 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2144 switch (uevent->attr.loglevel_type) {
8005f29a 2145 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2146 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2147 break;
8005f29a 2148 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2149 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2150 break;
2151 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2152 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2153 break;
9f19cc17 2154 }
d7b75b30 2155 i++;
9f19cc17
DG
2156 }
2157
b551a063
DG
2158 ret = nb_event;
2159 *events = tmp;
2160
2161error:
2162 rcu_read_unlock();
2163 return ret;
9f19cc17
DG
2164}
2165
2166/*
b551a063 2167 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2168 */
b551a063
DG
2169static int list_lttng_kernel_events(char *channel_name,
2170 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2171{
b551a063
DG
2172 int i = 0, ret;
2173 unsigned int nb_event;
9f19cc17 2174 struct ltt_kernel_event *event;
b551a063
DG
2175 struct ltt_kernel_channel *kchan;
2176
2177 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2178 if (kchan == NULL) {
2179 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2180 goto error;
2181 }
2182
2183 nb_event = kchan->event_count;
9f19cc17
DG
2184
2185 DBG("Listing events for channel %s", kchan->channel->name);
2186
b551a063
DG
2187 if (nb_event == 0) {
2188 ret = nb_event;
2189 goto error;
2190 }
2191
2192 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2193 if (*events == NULL) {
2194 ret = LTTCOMM_FATAL;
2195 goto error;
2196 }
2197
9f19cc17
DG
2198 /* Kernel channels */
2199 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2200 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2201 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2202 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2203 switch (event->event->instrumentation) {
2204 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2205 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2206 break;
2207 case LTTNG_KERNEL_KPROBE:
2208 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2209 (*events)[i].type = LTTNG_EVENT_PROBE;
2210 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2211 sizeof(struct lttng_kernel_kprobe));
2212 break;
2213 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2214 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2215 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2216 sizeof(struct lttng_kernel_function));
2217 break;
0133c199 2218 case LTTNG_KERNEL_NOOP:
b551a063 2219 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2220 break;
a54bd42d 2221 case LTTNG_KERNEL_SYSCALL:
b551a063 2222 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2223 break;
7a3d1328
MD
2224 case LTTNG_KERNEL_ALL:
2225 assert(0);
2226 break;
9f19cc17
DG
2227 }
2228 i++;
2229 }
b551a063
DG
2230
2231 return nb_event;
2232
2233error:
2234 return ret;
9f19cc17
DG
2235}
2236
fac6795d 2237/*
54d01ffb 2238 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2239 */
54d01ffb
DG
2240static int cmd_disable_channel(struct ltt_session *session,
2241 int domain, char *channel_name)
fac6795d 2242{
54d01ffb 2243 int ret;
78f0bacd
DG
2244 struct ltt_ust_session *usess;
2245
2246 usess = session->ust_session;
379473d2 2247
54d01ffb 2248 switch (domain) {
78f0bacd
DG
2249 case LTTNG_DOMAIN_KERNEL:
2250 {
2251 ret = channel_kernel_disable(session->kernel_session,
2252 channel_name);
2253 if (ret != LTTCOMM_OK) {
2254 goto error;
2255 }
54d01ffb 2256
78f0bacd
DG
2257 kernel_wait_quiescent(kernel_tracer_fd);
2258 break;
2259 }
2260 case LTTNG_DOMAIN_UST:
2261 {
2262 struct ltt_ust_channel *uchan;
bec39940 2263 struct lttng_ht *chan_ht;
78f0bacd 2264
7885e399
DG
2265 chan_ht = usess->domain_global.channels;
2266
2267 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2268 if (uchan == NULL) {
2269 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2270 goto error;
78f0bacd
DG
2271 }
2272
7885e399
DG
2273 ret = channel_ust_disable(usess, domain, uchan);
2274 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2275 goto error;
2276 }
78f0bacd
DG
2277 break;
2278 }
d78d6610 2279#if 0
78f0bacd
DG
2280 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2281 case LTTNG_DOMAIN_UST_EXEC_NAME:
2282 case LTTNG_DOMAIN_UST_PID:
d78d6610 2283#endif
78f0bacd
DG
2284 default:
2285 ret = LTTCOMM_UNKNOWN_DOMAIN;
2286 goto error;
20fe2104
DG
2287 }
2288
54d01ffb 2289 ret = LTTCOMM_OK;
d65106b1 2290
54d01ffb
DG
2291error:
2292 return ret;
2293}
2294
2295/*
2296 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2297 */
44d3bd01 2298static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2299 int domain, struct lttng_channel *attr)
54d01ffb
DG
2300{
2301 int ret;
f6a9efaa 2302 struct ltt_ust_session *usess = session->ust_session;
bec39940 2303 struct lttng_ht *chan_ht;
f6a9efaa 2304
5d56b5aa 2305 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2306
aea829b3 2307 switch (domain) {
44d3bd01
DG
2308 case LTTNG_DOMAIN_KERNEL:
2309 {
2310 struct ltt_kernel_channel *kchan;
54d01ffb 2311
44d3bd01
DG
2312 kchan = trace_kernel_get_channel_by_name(attr->name,
2313 session->kernel_session);
2314 if (kchan == NULL) {
2315 ret = channel_kernel_create(session->kernel_session,
2316 attr, kernel_poll_pipe[1]);
2317 } else {
2318 ret = channel_kernel_enable(session->kernel_session, kchan);
2319 }
2320
2321 if (ret != LTTCOMM_OK) {
2322 goto error;
2323 }
2324
2325 kernel_wait_quiescent(kernel_tracer_fd);
2326 break;
2327 }
f6a9efaa
DG
2328 case LTTNG_DOMAIN_UST:
2329 {
2330 struct ltt_ust_channel *uchan;
2331
7885e399 2332 chan_ht = usess->domain_global.channels;
f6a9efaa 2333
7885e399 2334 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2335 if (uchan == NULL) {
7885e399 2336 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2337 } else {
7885e399 2338 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2339 }
f6a9efaa
DG
2340 break;
2341 }
d78d6610 2342#if 0
78f0bacd
DG
2343 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2344 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2345 case LTTNG_DOMAIN_UST_PID:
d78d6610 2346#endif
44d3bd01
DG
2347 default:
2348 ret = LTTCOMM_UNKNOWN_DOMAIN;
2349 goto error;
54d01ffb
DG
2350 }
2351
54d01ffb
DG
2352error:
2353 return ret;
2354}
2355
2356/*
2357 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2358 */
2359static int cmd_disable_event(struct ltt_session *session, int domain,
2360 char *channel_name, char *event_name)
2361{
2362 int ret;
54d01ffb
DG
2363
2364 switch (domain) {
2365 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2366 {
2367 struct ltt_kernel_channel *kchan;
b0a40d28 2368 struct ltt_kernel_session *ksess;
2bdd86d4 2369
b0a40d28
DG
2370 ksess = session->kernel_session;
2371
2372 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2373 if (kchan == NULL) {
2374 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2375 goto error;
d65106b1
DG
2376 }
2377
b0a40d28 2378 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2379 if (ret != LTTCOMM_OK) {
2380 goto error;
2381 }
2382
2383 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2384 break;
2bdd86d4
MD
2385 }
2386 case LTTNG_DOMAIN_UST:
b0a40d28 2387 {
b0a40d28 2388 struct ltt_ust_channel *uchan;
7f79d3a1 2389 struct ltt_ust_session *usess;
b0a40d28
DG
2390
2391 usess = session->ust_session;
2392
2393 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2394 channel_name);
2395 if (uchan == NULL) {
2396 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2397 goto error;
2398 }
2399
7f79d3a1
DG
2400 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2401 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2402 goto error;
2403 }
2404
7f79d3a1 2405 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2406 channel_name);
b0a40d28
DG
2407 break;
2408 }
d78d6610 2409#if 0
2bdd86d4
MD
2410 case LTTNG_DOMAIN_UST_EXEC_NAME:
2411 case LTTNG_DOMAIN_UST_PID:
2412 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2413#endif
54d01ffb 2414 default:
1ab1ea0b 2415 ret = LTTCOMM_UND;
54d01ffb 2416 goto error;
d65106b1 2417 }
26cc6b4e 2418
54d01ffb
DG
2419 ret = LTTCOMM_OK;
2420
2421error:
2422 return ret;
2423}
2424
2425/*
2426 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2427 */
2428static int cmd_disable_event_all(struct ltt_session *session, int domain,
2429 char *channel_name)
2430{
2431 int ret;
54d01ffb
DG
2432
2433 switch (domain) {
2434 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2435 {
2436 struct ltt_kernel_session *ksess;
2437 struct ltt_kernel_channel *kchan;
2438
2439 ksess = session->kernel_session;
2440
2441 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2442 if (kchan == NULL) {
2443 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2444 goto error;
26cc6b4e
DG
2445 }
2446
9730260e 2447 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2448 if (ret != LTTCOMM_OK) {
0b97ec54 2449 goto error;
26cc6b4e
DG
2450 }
2451
54d01ffb 2452 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2453 break;
9730260e
DG
2454 }
2455 case LTTNG_DOMAIN_UST:
2456 {
2457 struct ltt_ust_session *usess;
2458 struct ltt_ust_channel *uchan;
2459
2460 usess = session->ust_session;
2461
2462 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2463 channel_name);
2464 if (uchan == NULL) {
2465 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2466 goto error;
2467 }
2468
7f79d3a1
DG
2469 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2470 if (ret != 0) {
9730260e
DG
2471 goto error;
2472 }
2473
7f79d3a1 2474 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2475
2476 break;
2477 }
d78d6610 2478#if 0
9730260e
DG
2479 case LTTNG_DOMAIN_UST_EXEC_NAME:
2480 case LTTNG_DOMAIN_UST_PID:
2481 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2482#endif
54d01ffb 2483 default:
1ab1ea0b 2484 ret = LTTCOMM_UND;
54d01ffb 2485 goto error;
26cc6b4e 2486 }
e953ef25 2487
54d01ffb 2488 ret = LTTCOMM_OK;
e953ef25 2489
54d01ffb
DG
2490error:
2491 return ret;
2492}
f5177a38 2493
54d01ffb
DG
2494/*
2495 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2496 */
2497static int cmd_add_context(struct ltt_session *session, int domain,
2498 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2499{
2500 int ret;
f5177a38 2501
54d01ffb
DG
2502 switch (domain) {
2503 case LTTNG_DOMAIN_KERNEL:
2504 /* Add kernel context to kernel tracer */
2505 ret = context_kernel_add(session->kernel_session, ctx,
2506 event_name, channel_name);
2507 if (ret != LTTCOMM_OK) {
f5177a38 2508 goto error;
e953ef25 2509 }
2bdd86d4
MD
2510 break;
2511 case LTTNG_DOMAIN_UST:
2512 {
55cc08a6 2513 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2514
55cc08a6
DG
2515 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2516 if (ret != LTTCOMM_OK) {
2517 goto error;
2bdd86d4 2518 }
e953ef25 2519 break;
2bdd86d4 2520 }
d78d6610 2521#if 0
55cc08a6
DG
2522 case LTTNG_DOMAIN_UST_EXEC_NAME:
2523 case LTTNG_DOMAIN_UST_PID:
2524 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2525#endif
54d01ffb 2526 default:
1ab1ea0b 2527 ret = LTTCOMM_UND;
54d01ffb 2528 goto error;
e953ef25 2529 }
950131af 2530
54d01ffb 2531 ret = LTTCOMM_OK;
950131af 2532
54d01ffb
DG
2533error:
2534 return ret;
2535}
2536
2537/*
2538 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2539 */
2540static int cmd_enable_event(struct ltt_session *session, int domain,
2541 char *channel_name, struct lttng_event *event)
2542{
2543 int ret;
f6cd6b0f 2544 struct lttng_channel *attr;
48842b30 2545 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2546
2547 switch (domain) {
2548 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2549 {
2550 struct ltt_kernel_channel *kchan;
2551
54d01ffb
DG
2552 kchan = trace_kernel_get_channel_by_name(channel_name,
2553 session->kernel_session);
2554 if (kchan == NULL) {
f6cd6b0f
DG
2555 attr = channel_new_default_attr(domain);
2556 if (attr == NULL) {
2557 ret = LTTCOMM_FATAL;
2558 goto error;
2559 }
2560 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2561
54d01ffb 2562 /* This call will notify the kernel thread */
44d3bd01 2563 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2564 attr, kernel_poll_pipe[1]);
54d01ffb 2565 if (ret != LTTCOMM_OK) {
ff4d74e6 2566 free(attr);
f5177a38
DG
2567 goto error;
2568 }
ff4d74e6 2569 free(attr);
54d01ffb 2570 }
950131af 2571
54d01ffb
DG
2572 /* Get the newly created kernel channel pointer */
2573 kchan = trace_kernel_get_channel_by_name(channel_name,
2574 session->kernel_session);
2575 if (kchan == NULL) {
2576 /* This sould not happen... */
2577 ret = LTTCOMM_FATAL;
2578 goto error;
2579 }
f5177a38 2580
48842b30
DG
2581 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2582 event);
54d01ffb 2583 if (ret != LTTCOMM_OK) {
f5177a38 2584 goto error;
950131af
DG
2585 }
2586
54d01ffb 2587 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2588 break;
2bdd86d4
MD
2589 }
2590 case LTTNG_DOMAIN_UST:
2591 {
aea829b3 2592 struct lttng_channel *attr;
edb67388 2593 struct ltt_ust_channel *uchan;
2bdd86d4 2594
edb67388 2595 /* Get channel from global UST domain */
48842b30
DG
2596 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2597 channel_name);
2598 if (uchan == NULL) {
aea829b3
DG
2599 /* Create default channel */
2600 attr = channel_new_default_attr(domain);
2601 if (attr == NULL) {
2602 ret = LTTCOMM_FATAL;
2603 goto error;
2604 }
596219f7 2605 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2606 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2607
7885e399 2608 ret = channel_ust_create(usess, domain, attr);
edb67388 2609 if (ret != LTTCOMM_OK) {
ff4d74e6 2610 free(attr);
aea829b3
DG
2611 goto error;
2612 }
aea829b3
DG
2613 free(attr);
2614
2615 /* Get the newly created channel reference back */
2616 uchan = trace_ust_find_channel_by_name(
2617 usess->domain_global.channels, channel_name);
2618 if (uchan == NULL) {
2619 /* Something is really wrong */
2620 ret = LTTCOMM_FATAL;
2621 goto error;
2622 }
48842b30 2623 }
2bdd86d4 2624
edb67388 2625 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2626 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2627 if (ret != LTTCOMM_OK) {
48842b30 2628 goto error;
2bdd86d4
MD
2629 }
2630 break;
2631 }
d78d6610 2632#if 0
2bdd86d4
MD
2633 case LTTNG_DOMAIN_UST_EXEC_NAME:
2634 case LTTNG_DOMAIN_UST_PID:
2635 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2636#endif
54d01ffb 2637 default:
1ab1ea0b 2638 ret = LTTCOMM_UND;
54d01ffb 2639 goto error;
950131af 2640 }
d36b8583 2641
54d01ffb 2642 ret = LTTCOMM_OK;
d36b8583 2643
54d01ffb
DG
2644error:
2645 return ret;
2646}
7d29a247 2647
54d01ffb
DG
2648/*
2649 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2650 */
2651static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2652 char *channel_name, int event_type)
54d01ffb
DG
2653{
2654 int ret;
2655 struct ltt_kernel_channel *kchan;
7d29a247 2656
54d01ffb
DG
2657 switch (domain) {
2658 case LTTNG_DOMAIN_KERNEL:
2659 kchan = trace_kernel_get_channel_by_name(channel_name,
2660 session->kernel_session);
2661 if (kchan == NULL) {
2662 /* This call will notify the kernel thread */
44d3bd01
DG
2663 ret = channel_kernel_create(session->kernel_session, NULL,
2664 kernel_poll_pipe[1]);
54d01ffb
DG
2665 if (ret != LTTCOMM_OK) {
2666 goto error;
d36b8583 2667 }
0d0c377a 2668
8f69e5eb
DG
2669 /* Get the newly created kernel channel pointer */
2670 kchan = trace_kernel_get_channel_by_name(channel_name,
2671 session->kernel_session);
2672 if (kchan == NULL) {
2673 /* This sould not happen... */
2674 ret = LTTCOMM_FATAL;
2675 goto error;
2676 }
2677
54d01ffb 2678 }
0fdd1e2c 2679
7a3d1328 2680 switch (event_type) {
76d45b40 2681 case LTTNG_EVENT_SYSCALL:
7a3d1328 2682 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2683 kchan, kernel_tracer_fd);
7a3d1328 2684 break;
76d45b40 2685 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2686 /*
7a3d1328
MD
2687 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2688 * events already registered to the channel.
8c9ae521 2689 */
7a3d1328
MD
2690 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2691 kchan, kernel_tracer_fd);
2692 break;
76d45b40 2693 case LTTNG_EVENT_ALL:
7a3d1328 2694 /* Enable syscalls and tracepoints */
8c9ae521
DG
2695 ret = event_kernel_enable_all(session->kernel_session,
2696 kchan, kernel_tracer_fd);
7a3d1328
MD
2697 break;
2698 default:
2699 ret = LTTCOMM_KERN_ENABLE_FAIL;
2700 goto error;
8c9ae521 2701 }
8f69e5eb
DG
2702
2703 /* Manage return value */
54d01ffb 2704 if (ret != LTTCOMM_OK) {
0d0c377a 2705 goto error;
d36b8583
DG
2706 }
2707
54d01ffb 2708 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2709 break;
76d45b40
DG
2710 case LTTNG_DOMAIN_UST:
2711 {
2712 struct lttng_channel *attr;
2713 struct ltt_ust_channel *uchan;
2714 struct ltt_ust_session *usess = session->ust_session;
2715
2716 /* Get channel from global UST domain */
2717 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2718 channel_name);
2719 if (uchan == NULL) {
2720 /* Create default channel */
2721 attr = channel_new_default_attr(domain);
2722 if (attr == NULL) {
2723 ret = LTTCOMM_FATAL;
2724 goto error;
2725 }
2726 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2727 attr->name[NAME_MAX - 1] = '\0';
2728
2729 /* Use the internal command enable channel */
7885e399 2730 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2731 if (ret != LTTCOMM_OK) {
2732 free(attr);
2733 goto error;
2734 }
2735 free(attr);
2736
2737 /* Get the newly created channel reference back */
2738 uchan = trace_ust_find_channel_by_name(
2739 usess->domain_global.channels, channel_name);
2740 if (uchan == NULL) {
2741 /* Something is really wrong */
2742 ret = LTTCOMM_FATAL;
2743 goto error;
2744 }
2745 }
2746
2747 /* At this point, the session and channel exist on the tracer */
2748
2749 switch (event_type) {
2750 case LTTNG_EVENT_ALL:
2751 case LTTNG_EVENT_TRACEPOINT:
2752 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2753 if (ret != LTTCOMM_OK) {
2754 goto error;
2755 }
2756 break;
2757 default:
2758 ret = LTTCOMM_UST_ENABLE_FAIL;
2759 goto error;
2760 }
2761
2762 /* Manage return value */
2763 if (ret != LTTCOMM_OK) {
2764 goto error;
2765 }
2766
2767 break;
2768 }
d78d6610 2769#if 0
76d45b40
DG
2770 case LTTNG_DOMAIN_UST_EXEC_NAME:
2771 case LTTNG_DOMAIN_UST_PID:
2772 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2773#endif
54d01ffb 2774 default:
1ab1ea0b 2775 ret = LTTCOMM_UND;
54d01ffb 2776 goto error;
d36b8583 2777 }
f3ed775e 2778
54d01ffb
DG
2779 ret = LTTCOMM_OK;
2780
2781error:
2782 return ret;
2783}
2784
2785/*
2786 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2787 */
2788static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2789{
2790 int ret;
2791 ssize_t nb_events = 0;
2792
2793 switch (domain) {
2794 case LTTNG_DOMAIN_KERNEL:
2795 nb_events = kernel_list_events(kernel_tracer_fd, events);
2796 if (nb_events < 0) {
2797 ret = LTTCOMM_KERN_LIST_FAIL;
2798 goto error;
894be886 2799 }
54d01ffb 2800 break;
b551a063
DG
2801 case LTTNG_DOMAIN_UST:
2802 nb_events = ust_app_list_events(events);
2803 if (nb_events < 0) {
2804 ret = LTTCOMM_UST_LIST_FAIL;
2805 goto error;
2806 }
2807 break;
54d01ffb 2808 default:
1ab1ea0b 2809 ret = LTTCOMM_UND;
54d01ffb
DG
2810 goto error;
2811 }
894be886 2812
54d01ffb 2813 return nb_events;
7d29a247 2814
54d01ffb
DG
2815error:
2816 /* Return negative value to differentiate return code */
2817 return -ret;
2818}
b389abbe 2819
54d01ffb
DG
2820/*
2821 * Command LTTNG_START_TRACE processed by the client thread.
2822 */
2823static int cmd_start_trace(struct ltt_session *session)
2824{
2825 int ret;
54d01ffb 2826 struct ltt_kernel_session *ksession;
b9d9b220 2827 struct ltt_ust_session *usess;
b389abbe 2828
54d01ffb
DG
2829 /* Short cut */
2830 ksession = session->kernel_session;
b9d9b220 2831 usess = session->ust_session;
5eb91c98 2832
b9ef1c83
DG
2833 if (session->enabled) {
2834 ret = LTTCOMM_UST_START_FAIL;
2835 goto error;
2836 }
2837
464dd62d
MD
2838 session->enabled = 1;
2839
54d01ffb
DG
2840 /* Kernel tracing */
2841 if (ksession != NULL) {
2bdd86d4
MD
2842 struct ltt_kernel_channel *kchan;
2843
54d01ffb
DG
2844 /* Open kernel metadata */
2845 if (ksession->metadata == NULL) {
2846 ret = kernel_open_metadata(ksession, ksession->trace_path);
2847 if (ret < 0) {
2848 ret = LTTCOMM_KERN_META_FAIL;
2849 goto error;
b389abbe 2850 }
54d01ffb 2851 }
7d29a247 2852
54d01ffb
DG
2853 /* Open kernel metadata stream */
2854 if (ksession->metadata_stream_fd == 0) {
2855 ret = kernel_open_metadata_stream(ksession);
2856 if (ret < 0) {
2857 ERR("Kernel create metadata stream failed");
2858 ret = LTTCOMM_KERN_STREAM_FAIL;
2859 goto error;
2860 }
2861 }
2862
2863 /* For each channel */
2864 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2865 if (kchan->stream_count == 0) {
2866 ret = kernel_open_channel_stream(kchan);
2867 if (ret < 0) {
2868 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2869 goto error;
2870 }
54d01ffb
DG
2871 /* Update the stream global counter */
2872 ksession->stream_count_global += ret;
7d29a247 2873 }
54d01ffb
DG
2874 }
2875
2876 /* Setup kernel consumer socket and send fds to it */
2877 ret = init_kernel_tracing(ksession);
2878 if (ret < 0) {
2879 ret = LTTCOMM_KERN_START_FAIL;
2880 goto error;
2881 }
2882
2883 /* This start the kernel tracing */
2884 ret = kernel_start_session(ksession);
2885 if (ret < 0) {
2886 ret = LTTCOMM_KERN_START_FAIL;
2887 goto error;
2888 }
2889
2890 /* Quiescent wait after starting trace */
2891 kernel_wait_quiescent(kernel_tracer_fd);
2892 }
2893
36dc12cc 2894 /* Flag session that trace should start automatically */
b9d9b220
DG
2895 if (usess) {
2896 usess->start_trace = 1;
36dc12cc 2897
b9d9b220
DG
2898 ret = ust_app_start_trace_all(usess);
2899 if (ret < 0) {
2900 ret = LTTCOMM_UST_START_FAIL;
2901 goto error;
2902 }
2bdd86d4 2903 }
54d01ffb
DG
2904
2905 ret = LTTCOMM_OK;
2906
2907error:
2908 return ret;
2909}
2910
2911/*
2912 * Command LTTNG_STOP_TRACE processed by the client thread.
2913 */
2914static int cmd_stop_trace(struct ltt_session *session)
2915{
2916 int ret;
2917 struct ltt_kernel_channel *kchan;
2918 struct ltt_kernel_session *ksession;
8be98f9a 2919 struct ltt_ust_session *usess;
54d01ffb
DG
2920
2921 /* Short cut */
2922 ksession = session->kernel_session;
8be98f9a 2923 usess = session->ust_session;
54d01ffb 2924
b9ef1c83 2925 if (!session->enabled) {
190df5ac 2926 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG
2927 goto error;
2928 }
2929
464dd62d
MD
2930 session->enabled = 0;
2931
54d01ffb
DG
2932 /* Kernel tracer */
2933 if (ksession != NULL) {
2934 DBG("Stop kernel tracing");
2935
2936 /* Flush all buffers before stopping */
2937 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2938 if (ret < 0) {
2939 ERR("Kernel metadata flush failed");
2940 }
f34daff7 2941
54d01ffb
DG
2942 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2943 ret = kernel_flush_buffer(kchan);
0d0c377a 2944 if (ret < 0) {
54d01ffb 2945 ERR("Kernel flush buffer error");
7d29a247 2946 }
54d01ffb 2947 }
19e70852 2948
54d01ffb
DG
2949 ret = kernel_stop_session(ksession);
2950 if (ret < 0) {
2951 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2952 goto error;
f3ed775e 2953 }
54d01ffb
DG
2954
2955 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2956 }
54d01ffb 2957
8be98f9a
MD
2958 if (usess) {
2959 usess->start_trace = 0;
2bdd86d4 2960
8be98f9a 2961 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2962 if (ret < 0) {
190df5ac 2963 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
2964 goto error;
2965 }
2bdd86d4 2966 }
54d01ffb
DG
2967
2968 ret = LTTCOMM_OK;
2969
2970error:
2971 return ret;
2972}
2973
2974/*
2975 * Command LTTNG_CREATE_SESSION processed by the client thread.
2976 */
ca4537d3 2977static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG
2978{
2979 int ret;
2980
ca4537d3 2981 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG
2982 if (ret != LTTCOMM_OK) {
2983 goto error;
2984 }
2985
2986 ret = LTTCOMM_OK;
2987
2988error:
2989 return ret;
2990}
2991
2992/*
2993 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2994 */
2995static int cmd_destroy_session(struct ltt_session *session, char *name)
2996{
2997 int ret;
2998
2999 /* Clean kernel session teardown */
3000 teardown_kernel_session(session);
84cd17c6
MD
3001 /* UST session teardown */
3002 teardown_ust_session(session);
54d01ffb
DG
3003
3004 /*
3005 * Must notify the kernel thread here to update it's poll setin order
3006 * to remove the channel(s)' fd just destroyed.
3007 */
3008 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3009 if (ret < 0) {
76d7553f 3010 PERROR("write kernel poll pipe");
54d01ffb
DG
3011 }
3012
271933a4 3013 ret = session_destroy(session);
54d01ffb
DG
3014
3015 return ret;
3016}
3017
3018/*
3019 * Command LTTNG_CALIBRATE processed by the client thread.
3020 */
3021static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3022{
3023 int ret;
3024
3025 switch (domain) {
3026 case LTTNG_DOMAIN_KERNEL:
33a2b854 3027 {
54d01ffb 3028 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3029
54d01ffb
DG
3030 kcalibrate.type = calibrate->type;
3031 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3032 if (ret < 0) {
54d01ffb
DG
3033 ret = LTTCOMM_KERN_ENABLE_FAIL;
3034 goto error;
33a2b854 3035 }
54d01ffb
DG
3036 break;
3037 }
4466912f
DG
3038 case LTTNG_DOMAIN_UST:
3039 {
3040 struct lttng_ust_calibrate ucalibrate;
3041
3042 ucalibrate.type = calibrate->type;
3043 ret = ust_app_calibrate_glb(&ucalibrate);
3044 if (ret < 0) {
3045 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3046 goto error;
3047 }
3048 break;
3049 }
54d01ffb 3050 default:
1ab1ea0b 3051 ret = LTTCOMM_UND;
54d01ffb
DG
3052 goto error;
3053 }
33a2b854 3054
54d01ffb 3055 ret = LTTCOMM_OK;
33a2b854 3056
54d01ffb
DG
3057error:
3058 return ret;
3059}
7d29a247 3060
54d01ffb
DG
3061/*
3062 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3063 */
3064static int cmd_register_consumer(struct ltt_session *session, int domain,
3065 char *sock_path)
3066{
3067 int ret, sock;
b389abbe 3068
54d01ffb
DG
3069 switch (domain) {
3070 case LTTNG_DOMAIN_KERNEL:
3071 /* Can't register a consumer if there is already one */
48c4f28c 3072 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3073 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3074 goto error;
3075 }
3076
3077 sock = lttcomm_connect_unix_sock(sock_path);
3078 if (sock < 0) {
3079 ret = LTTCOMM_CONNECT_FAIL;
3080 goto error;
3081 }
3082
3083 session->kernel_session->consumer_fd = sock;
3084 break;
3085 default:
3086 /* TODO: Userspace tracing */
1ab1ea0b 3087 ret = LTTCOMM_UND;
54d01ffb
DG
3088 goto error;
3089 }
3090
3091 ret = LTTCOMM_OK;
3092
3093error:
3094 return ret;
3095}
3096
3097/*
3098 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3099 */
3100static ssize_t cmd_list_domains(struct ltt_session *session,
3101 struct lttng_domain **domains)
3102{
b551a063 3103 int ret, index = 0;
54d01ffb
DG
3104 ssize_t nb_dom = 0;
3105
3106 if (session->kernel_session != NULL) {
b551a063 3107 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3108 nb_dom++;
3109 }
3110
b551a063
DG
3111 if (session->ust_session != NULL) {
3112 DBG3("Listing domains found UST global domain");
3113 nb_dom++;
3114 }
54d01ffb 3115
b551a063 3116 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3117 if (*domains == NULL) {
3118 ret = -LTTCOMM_FATAL;
3119 goto error;
3120 }
3121
b551a063
DG
3122 if (session->kernel_session != NULL) {
3123 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3124 index++;
3125 }
3126
3127 if (session->ust_session != NULL) {
3128 (*domains)[index].type = LTTNG_DOMAIN_UST;
3129 index++;
3130 }
54d01ffb 3131
54d01ffb
DG
3132 return nb_dom;
3133
3134error:
3135 return ret;
3136}
3137
3138/*
3139 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3140 */
b551a063 3141static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3142 struct lttng_channel **channels)
3143{
3144 int ret;
3145 ssize_t nb_chan = 0;
3146
b551a063
DG
3147 switch (domain) {
3148 case LTTNG_DOMAIN_KERNEL:
3149 if (session->kernel_session != NULL) {
3150 nb_chan = session->kernel_session->channel_count;
3151 }
0df502fd 3152 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3153 break;
3154 case LTTNG_DOMAIN_UST:
3155 if (session->ust_session != NULL) {
bec39940 3156 nb_chan = lttng_ht_get_count(
b551a063
DG
3157 session->ust_session->domain_global.channels);
3158 }
0df502fd 3159 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3160 break;
3161 default:
3162 *channels = NULL;
1ab1ea0b 3163 ret = -LTTCOMM_UND;
54d01ffb
DG
3164 goto error;
3165 }
3166
b551a063
DG
3167 if (nb_chan > 0) {
3168 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3169 if (*channels == NULL) {
3170 ret = -LTTCOMM_FATAL;
3171 goto error;
3172 }
54d01ffb 3173
b551a063
DG
3174 list_lttng_channels(domain, session, *channels);
3175 } else {
3176 *channels = NULL;
3177 }
2bdd86d4 3178
54d01ffb
DG
3179 return nb_chan;
3180
3181error:
3182 return ret;
3183}
3184
3185/*
3186 * Command LTTNG_LIST_EVENTS processed by the client thread.
3187 */
b551a063 3188static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3189 char *channel_name, struct lttng_event **events)
3190{
b551a063 3191 int ret = 0;
54d01ffb 3192 ssize_t nb_event = 0;
54d01ffb 3193
b551a063
DG
3194 switch (domain) {
3195 case LTTNG_DOMAIN_KERNEL:
3196 if (session->kernel_session != NULL) {
3197 nb_event = list_lttng_kernel_events(channel_name,
3198 session->kernel_session, events);
54d01ffb 3199 }
b551a063
DG
3200 break;
3201 case LTTNG_DOMAIN_UST:
3202 {
3203 if (session->ust_session != NULL) {