Fix incorrect thread cleanup on blocking recv()
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
996b65c8 3 * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d
DG
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
82a3637f
DG
7 * as published by the Free Software Foundation; only version 2
8 * of the License.
91d76f53 9 *
fac6795d
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10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
91d76f53 14 *
fac6795d
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15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
18 */
19
20#define _GNU_SOURCE
21#include <fcntl.h>
22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
7a485870 25#include <poll.h>
fac6795d 26#include <pthread.h>
8c0faa1d 27#include <semaphore.h>
fac6795d
DG
28#include <signal.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <sys/ipc.h>
b73401da 33#include <sys/mount.h>
fac6795d
DG
34#include <sys/shm.h>
35#include <sys/socket.h>
36#include <sys/stat.h>
37#include <sys/types.h>
f3ed775e
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38#include <sys/time.h>
39#include <sys/resource.h>
fac6795d
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40#include <unistd.h>
41
42#include <urcu/list.h> /* URCU list library (-lurcu) */
5b97ec60 43#include <lttng/lttng.h>
6533b585 44#include <lttng/lttng-kconsumerd.h>
e88129fc 45#include <lttng-sessiond-comm.h>
fac6795d 46
b579acd9 47#include "context.h"
fac6795d 48#include "ltt-sessiond.h"
75462a81 49#include "lttngerr.h"
20fe2104 50#include "kernel-ctl.h"
9e78d6ae 51#include "ust-ctl.h"
5b74c7b1 52#include "session.h"
91d76f53 53#include "traceable-app.h"
6533b585 54#include "ltt-kconsumerd.h"
8e68d1c8 55#include "utils.h"
fac6795d 56
75462a81 57/* Const values */
686204ab 58const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 59const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
60const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
61const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
62
fac6795d 63/* Variables */
1d4b027a 64int opt_verbose; /* Not static for lttngerr.h */
31f73cc9 65int opt_verbose_kconsumerd; /* Not static for lttngerr.h */
1d4b027a 66int opt_quiet; /* Not static for lttngerr.h */
d063d709 67
fac6795d
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68const char *progname;
69const char *opt_tracing_group;
5b8719f5 70static int opt_sig_parent;
fac6795d
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71static int opt_daemon;
72static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
DG
73static pid_t ppid; /* Parent PID for --sig-parent option */
74static pid_t kconsumerd_pid;
7a485870 75static struct pollfd *kernel_pollfd;
fac6795d 76
d6f42150
DG
77static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
78static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
79static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
80static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
fac6795d 81
1d4b027a 82/* Sockets and FDs */
d6f42150
DG
83static int client_sock;
84static int apps_sock;
85static int kconsumerd_err_sock;
8c0faa1d 86static int kconsumerd_cmd_sock;
20fe2104 87static int kernel_tracer_fd;
7a485870 88static int kernel_poll_pipe[2];
1d4b027a 89
273ea72c
DG
90/*
91 * Quit pipe for all threads. This permits a single cancellation point
92 * for all threads when receiving an event on the pipe.
93 */
94static int thread_quit_pipe[2];
95
1d4b027a 96/* Pthread, Mutexes and Semaphores */
8c0faa1d 97static pthread_t kconsumerd_thread;
1d4b027a
DG
98static pthread_t apps_thread;
99static pthread_t client_thread;
7a485870 100static pthread_t kernel_thread;
8c0faa1d
DG
101static sem_t kconsumerd_sem;
102
1d4b027a 103static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 104
ab147185
MD
105static int modprobe_remove_kernel_modules(void);
106
b5541356
DG
107/*
108 * Pointer initialized before thread creation.
109 *
110 * This points to the tracing session list containing the session count and a
111 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
112 * MUST NOT be taken if you call a public function in session.c.
04ea676f 113 *
d063d709
DG
114 * The lock is nested inside the structure: session_list_ptr->lock. Please use
115 * lock_session_list and unlock_session_list for lock acquisition.
b5541356
DG
116 */
117static struct ltt_session_list *session_list_ptr;
118
996b65c8
MD
119static gid_t allowed_group(void)
120{
121 struct group *grp;
122
274e143b
MD
123 if (opt_tracing_group) {
124 grp = getgrnam(opt_tracing_group);
125 } else {
126 grp = getgrnam(default_tracing_group);
127 }
996b65c8
MD
128 if (!grp) {
129 return -1;
130 } else {
131 return grp->gr_gid;
132 }
133}
134
273ea72c
DG
135/*
136 * Init quit pipe.
137 *
138 * Return -1 on error or 0 if all pipes are created.
139 */
140static int init_thread_quit_pipe(void)
141{
142 int ret;
143
144 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
145 if (ret < 0) {
146 perror("thread quit pipe");
147 goto error;
148 }
149
150error:
151 return ret;
152}
153
fac6795d 154/*
d063d709
DG
155 * Complete teardown of a kernel session. This free all data structure related
156 * to a kernel session and update counter.
fac6795d 157 */
1d4b027a 158static void teardown_kernel_session(struct ltt_session *session)
fac6795d 159{
1d4b027a
DG
160 if (session->kernel_session != NULL) {
161 DBG("Tearing down kernel session");
d9800920
DG
162
163 /*
164 * If a custom kernel consumer was registered, close the socket before
165 * tearing down the complete kernel session structure
166 */
167 if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) {
168 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
169 }
170
c363b55d 171 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
DG
172 /* Extra precaution */
173 session->kernel_session = NULL;
fac6795d 174 }
fac6795d
DG
175}
176
cf3af59e
MD
177static void stop_threads(void)
178{
179 /* Stopping all threads */
180 DBG("Terminating all threads");
181 close(thread_quit_pipe[0]);
182 close(thread_quit_pipe[1]);
183}
184
fac6795d 185/*
d063d709 186 * Cleanup the daemon
fac6795d 187 */
cf3af59e 188static void cleanup(void)
fac6795d 189{
1d4b027a
DG
190 int ret;
191 char *cmd;
af9737e9 192 struct ltt_session *sess, *stmp;
fac6795d 193
1d4b027a 194 DBG("Cleaning up");
e07ae692 195
1d4b027a 196 /* <fun> */
273ea72c
DG
197 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
198 "Matthew, BEET driven development works!%c[%dm",
199 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 200 /* </fun> */
fac6795d 201
1d4b027a
DG
202 DBG("Removing %s directory", LTTNG_RUNDIR);
203 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
204 if (ret < 0) {
205 ERR("asprintf failed. Something is really wrong!");
206 }
5461b305 207
1d4b027a
DG
208 /* Remove lttng run directory */
209 ret = system(cmd);
210 if (ret < 0) {
211 ERR("Unable to clean " LTTNG_RUNDIR);
212 }
5461b305 213
1d4b027a 214 DBG("Cleaning up all session");
fac6795d 215
b5541356 216 /* Destroy session list mutex */
273ea72c
DG
217 if (session_list_ptr != NULL) {
218 pthread_mutex_destroy(&session_list_ptr->lock);
219
220 /* Cleanup ALL session */
af9737e9 221 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
273ea72c
DG
222 teardown_kernel_session(sess);
223 // TODO complete session cleanup (including UST)
224 }
225 }
226
227 pthread_mutex_destroy(&kconsumerd_pid_mutex);
b5541356 228
f3ed775e 229 DBG("Closing kernel fd");
1d4b027a 230 close(kernel_tracer_fd);
ab147185
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231
232 DBG("Unloading kernel modules");
233 modprobe_remove_kernel_modules();
fac6795d
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234}
235
e065084a 236/*
d063d709 237 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 238 *
d063d709 239 * Return lttcomm error code.
e065084a
DG
240 */
241static int send_unix_sock(int sock, void *buf, size_t len)
242{
243 /* Check valid length */
244 if (len <= 0) {
245 return -1;
246 }
247
248 return lttcomm_send_unix_sock(sock, buf, len);
249}
250
5461b305 251/*
d063d709 252 * Free memory of a command context structure.
5461b305 253 */
a2fb29a5 254static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 255{
a2fb29a5
DG
256 DBG("Clean command context structure");
257 if (*cmd_ctx) {
258 if ((*cmd_ctx)->llm) {
259 free((*cmd_ctx)->llm);
5461b305 260 }
a2fb29a5
DG
261 if ((*cmd_ctx)->lsm) {
262 free((*cmd_ctx)->lsm);
5461b305 263 }
a2fb29a5
DG
264 free(*cmd_ctx);
265 *cmd_ctx = NULL;
5461b305
DG
266 }
267}
268
f3ed775e 269/*
d063d709 270 * Send all stream fds of kernel channel to the consumer.
f3ed775e 271 */
7a485870 272static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
273{
274 int ret;
275 size_t nb_fd;
276 struct ltt_kernel_stream *stream;
f3ed775e
DG
277 struct lttcomm_kconsumerd_header lkh;
278 struct lttcomm_kconsumerd_msg lkm;
279
7a485870
DG
280 DBG("Sending fds of channel %s to kernel consumer", channel->channel->name);
281
282 nb_fd = channel->stream_count;
f3ed775e
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283
284 /* Setup header */
7a485870 285 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
f3ed775e
DG
286 lkh.cmd_type = ADD_STREAM;
287
288 DBG("Sending kconsumerd header");
289
290 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
291 if (ret < 0) {
292 perror("send kconsumerd header");
293 goto error;
294 }
295
7a485870
DG
296 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
297 if (stream->fd != 0) {
f3ed775e
DG
298 lkm.fd = stream->fd;
299 lkm.state = stream->state;
7a485870 300 lkm.max_sb_size = channel->channel->attr.subbuf_size;
e8b60857 301 lkm.output = channel->channel->attr.output;
f3ed775e 302 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
99497cd0 303 lkm.path_name[PATH_MAX - 1] = '\0';
f3ed775e
DG
304
305 DBG("Sending fd %d to kconsumerd", lkm.fd);
306
307 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
308 if (ret < 0) {
309 perror("send kconsumerd fd");
310 goto error;
311 }
312 }
313 }
314
7a485870 315 DBG("Kconsumerd channel fds sent");
f3ed775e
DG
316
317 return 0;
318
319error:
320 return ret;
321}
322
323/*
d063d709 324 * Send all stream fds of the kernel session to the consumer.
f3ed775e 325 */
d9800920 326static int send_kconsumerd_fds(struct ltt_kernel_session *session)
f3ed775e
DG
327{
328 int ret;
329 struct ltt_kernel_channel *chan;
7a485870
DG
330 struct lttcomm_kconsumerd_header lkh;
331 struct lttcomm_kconsumerd_msg lkm;
332
333 /* Setup header */
334 lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg);
335 lkh.cmd_type = ADD_STREAM;
336
337 DBG("Sending kconsumerd header for metadata");
338
d9800920 339 ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header));
7a485870
DG
340 if (ret < 0) {
341 perror("send kconsumerd header");
342 goto error;
343 }
344
345 DBG("Sending metadata stream fd");
346
d9800920
DG
347 /* Extra protection. It's NOT suppose to be set to 0 at this point */
348 if (session->consumer_fd == 0) {
349 session->consumer_fd = kconsumerd_cmd_sock;
350 }
351
7a485870
DG
352 if (session->metadata_stream_fd != 0) {
353 /* Send metadata stream fd first */
354 lkm.fd = session->metadata_stream_fd;
355 lkm.state = ACTIVE_FD;
356 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
8b270bdb 357 lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
7a485870 358 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
99497cd0 359 lkm.path_name[PATH_MAX - 1] = '\0';
7a485870 360
d9800920 361 ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm));
7a485870
DG
362 if (ret < 0) {
363 perror("send kconsumerd fd");
364 goto error;
365 }
366 }
f3ed775e 367
f3ed775e 368 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
d9800920 369 ret = send_kconsumerd_channel_fds(session->consumer_fd, chan);
f3ed775e 370 if (ret < 0) {
7a485870 371 goto error;
f3ed775e
DG
372 }
373 }
374
7a485870
DG
375 DBG("Kconsumerd fds (metadata and channel streams) sent");
376
f3ed775e
DG
377 return 0;
378
379error:
380 return ret;
381}
382
97b1a726 383#ifdef DISABLED
fac6795d 384/*
d063d709
DG
385 * Return a socket connected to the libust communication socket of the
386 * application identified by the pid.
fac6795d 387 *
d063d709 388 * If the pid is not found in the traceable list, return -1 to indicate error.
fac6795d 389 */
471d1693 390static int ust_connect_app(pid_t pid)
fac6795d 391{
91d76f53
DG
392 int sock;
393 struct ltt_traceable_app *lta;
379473d2 394
e07ae692
DG
395 DBG("Connect to application pid %d", pid);
396
91d76f53
DG
397 lta = find_app_by_pid(pid);
398 if (lta == NULL) {
399 /* App not found */
7442b2ba 400 DBG("Application pid %d not found", pid);
379473d2
DG
401 return -1;
402 }
fac6795d 403
91d76f53 404 sock = ustctl_connect_pid(lta->pid);
fac6795d 405 if (sock < 0) {
62d3069f 406 ERR("Fail connecting to the PID %d", pid);
fac6795d
DG
407 }
408
409 return sock;
410}
97b1a726 411#endif /* DISABLED */
fac6795d
DG
412
413/*
d063d709
DG
414 * Notify apps by writing 42 to a named pipe using name. Every applications
415 * waiting for a ltt-sessiond will be notified and re-register automatically to
416 * the session daemon.
fac6795d 417 *
d063d709 418 * Return open or write error value.
fac6795d
DG
419 */
420static int notify_apps(const char *name)
421{
422 int fd;
423 int ret = -1;
424
e07ae692
DG
425 DBG("Notify the global application pipe");
426
fac6795d
DG
427 /* Try opening the global pipe */
428 fd = open(name, O_WRONLY);
429 if (fd < 0) {
430 goto error;
431 }
432
433 /* Notify by writing on the pipe */
434 ret = write(fd, "42", 2);
435 if (ret < 0) {
436 perror("write");
437 }
438
439error:
440 return ret;
441}
442
e065084a 443/*
d063d709
DG
444 * Setup the outgoing data buffer for the response (llm) by allocating the
445 * right amount of memory and copying the original information from the lsm
446 * structure.
ca95a216 447 *
d063d709 448 * Return total size of the buffer pointed by buf.
ca95a216 449 */
5461b305 450static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 451{
f3ed775e 452 int ret, buf_size;
ca95a216 453
f3ed775e 454 buf_size = size;
5461b305
DG
455
456 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
457 if (cmd_ctx->llm == NULL) {
ca95a216 458 perror("malloc");
5461b305 459 ret = -ENOMEM;
ca95a216
DG
460 goto error;
461 }
462
5461b305
DG
463 /* Copy common data */
464 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 465 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 466
5461b305
DG
467 cmd_ctx->llm->data_size = size;
468 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
469
ca95a216
DG
470 return buf_size;
471
472error:
473 return ret;
474}
475
7a485870 476/*
d063d709
DG
477 * Update the kernel pollfd set of all channel fd available over all tracing
478 * session. Add the wakeup pipe at the end of the set.
7a485870
DG
479 */
480static int update_kernel_pollfd(void)
481{
482 int i = 0;
273ea72c
DG
483 /*
484 * The wakup pipe and the quit pipe are needed so the number of fds starts
485 * at 2 for those pipes.
486 */
487 unsigned int nb_fd = 2;
7a485870
DG
488 struct ltt_session *session;
489 struct ltt_kernel_channel *channel;
490
491 DBG("Updating kernel_pollfd");
492
493 /* Get the number of channel of all kernel session */
6c9cc2ab 494 lock_session_list();
b5541356
DG
495 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
496 lock_session(session);
7a485870 497 if (session->kernel_session == NULL) {
b5541356 498 unlock_session(session);
7a485870
DG
499 continue;
500 }
501 nb_fd += session->kernel_session->channel_count;
b5541356 502 unlock_session(session);
7a485870
DG
503 }
504
505 DBG("Resizing kernel_pollfd to size %d", nb_fd);
506
507 kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd));
508 if (kernel_pollfd == NULL) {
509 perror("malloc kernel_pollfd");
510 goto error;
511 }
512
b5541356
DG
513 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
514 lock_session(session);
7a485870 515 if (session->kernel_session == NULL) {
b5541356 516 unlock_session(session);
7a485870
DG
517 continue;
518 }
519 if (i >= nb_fd) {
520 ERR("To much channel for kernel_pollfd size");
b5541356 521 unlock_session(session);
7a485870
DG
522 break;
523 }
524 cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) {
525 kernel_pollfd[i].fd = channel->fd;
526 kernel_pollfd[i].events = POLLIN | POLLRDNORM;
527 i++;
528 }
b5541356 529 unlock_session(session);
7a485870 530 }
6c9cc2ab 531 unlock_session_list();
7a485870
DG
532
533 /* Adding wake up pipe */
273ea72c
DG
534 kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0];
535 kernel_pollfd[nb_fd - 2].events = POLLIN;
536
537 /* Adding the quit pipe */
538 kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0];
7a485870
DG
539
540 return nb_fd;
541
542error:
6c9cc2ab 543 unlock_session_list();
7a485870
DG
544 return -1;
545}
546
547/*
d063d709
DG
548 * Find the channel fd from 'fd' over all tracing session. When found, check
549 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 550 *
d063d709 551 * Useful for CPU hotplug feature.
7a485870
DG
552 */
553static int update_kernel_stream(int fd)
554{
555 int ret = 0;
556 struct ltt_session *session;
557 struct ltt_kernel_channel *channel;
558
559 DBG("Updating kernel streams for channel fd %d", fd);
560
6c9cc2ab 561 lock_session_list();
b5541356
DG
562 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
563 lock_session(session);
7a485870 564 if (session->kernel_session == NULL) {
b5541356 565 unlock_session(session);
7a485870
DG
566 continue;
567 }
d9800920
DG
568
569 /* This is not suppose to be 0 but this is an extra security check */
570 if (session->kernel_session->consumer_fd == 0) {
571 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
572 }
573
7a485870
DG
574 cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) {
575 if (channel->fd == fd) {
576 DBG("Channel found, updating kernel streams");
577 ret = kernel_open_channel_stream(channel);
578 if (ret < 0) {
579 goto end;
580 }
d9800920 581
7a485870
DG
582 /*
583 * Have we already sent fds to the consumer? If yes, it means that
584 * tracing is started so it is safe to send our updated stream fds.
585 */
586 if (session->kernel_session->kconsumer_fds_sent == 1) {
d9800920
DG
587 ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd,
588 channel);
7a485870
DG
589 if (ret < 0) {
590 goto end;
591 }
592 }
593 goto end;
594 }
595 }
b5541356 596 unlock_session(session);
7a485870
DG
597 }
598
599end:
6c9cc2ab 600 unlock_session_list();
b5541356
DG
601 if (session) {
602 unlock_session(session);
603 }
7a485870
DG
604 return ret;
605}
606
607/*
d063d709 608 * This thread manage event coming from the kernel.
7a485870 609 *
d063d709
DG
610 * Features supported in this thread:
611 * -) CPU Hotplug
7a485870
DG
612 */
613static void *thread_manage_kernel(void *data)
614{
615 int ret, i, nb_fd = 0;
616 char tmp;
617 int update_poll_flag = 1;
618
619 DBG("Thread manage kernel started");
620
621 while (1) {
622 if (update_poll_flag == 1) {
623 nb_fd = update_kernel_pollfd();
624 if (nb_fd < 0) {
625 goto error;
626 }
627 update_poll_flag = 0;
628 }
629
630 DBG("Polling on %d fds", nb_fd);
631
632 /* Poll infinite value of time */
633 ret = poll(kernel_pollfd, nb_fd, -1);
634 if (ret < 0) {
635 perror("poll kernel thread");
636 goto error;
637 } else if (ret == 0) {
638 /* Should not happen since timeout is infinite */
639 continue;
640 }
641
273ea72c
DG
642 /* Thread quit pipe has been closed. Killing thread. */
643 if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) {
644 goto error;
645 }
646
7a485870
DG
647 DBG("Kernel poll event triggered");
648
649 /*
650 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
651 * must be updated.
652 */
273ea72c 653 switch (kernel_pollfd[nb_fd - 2].revents) {
b5541356 654 case POLLIN:
7a485870
DG
655 ret = read(kernel_poll_pipe[0], &tmp, 1);
656 update_poll_flag = 1;
657 continue;
b5541356
DG
658 case POLLERR:
659 goto error;
660 default:
661 break;
7a485870
DG
662 }
663
664 for (i = 0; i < nb_fd; i++) {
665 switch (kernel_pollfd[i].revents) {
666 /*
667 * New CPU detected by the kernel. Adding kernel stream to kernel
668 * session and updating the kernel consumer
669 */
670 case POLLIN | POLLRDNORM:
671 ret = update_kernel_stream(kernel_pollfd[i].fd);
672 if (ret < 0) {
673 continue;
674 }
675 break;
676 }
677 }
678 }
679
680error:
681 DBG("Kernel thread dying");
682 if (kernel_pollfd) {
683 free(kernel_pollfd);
684 }
273ea72c
DG
685
686 close(kernel_poll_pipe[0]);
687 close(kernel_poll_pipe[1]);
7a485870
DG
688 return NULL;
689}
690
1d4b027a 691/*
d063d709 692 * This thread manage the kconsumerd error sent back to the session daemon.
1d4b027a
DG
693 */
694static void *thread_manage_kconsumerd(void *data)
695{
273ea72c 696 int sock = 0, ret;
1d4b027a 697 enum lttcomm_return_code code;
273ea72c 698 struct pollfd pollfd[2];
1d4b027a
DG
699
700 DBG("[thread] Manage kconsumerd started");
701
702 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
703 if (ret < 0) {
704 goto error;
705 }
706
273ea72c
DG
707 /* First fd is always the quit pipe */
708 pollfd[0].fd = thread_quit_pipe[0];
709
710 /* Apps socket */
711 pollfd[1].fd = kconsumerd_err_sock;
712 pollfd[1].events = POLLIN;
713
714 /* Inifinite blocking call, waiting for transmission */
715 ret = poll(pollfd, 2, -1);
716 if (ret < 0) {
717 perror("poll kconsumerd thread");
718 goto error;
719 }
720
721 /* Thread quit pipe has been closed. Killing thread. */
722 if (pollfd[0].revents == POLLNVAL) {
723 goto error;
724 } else if (pollfd[1].revents == POLLERR) {
725 ERR("Kconsumerd err socket poll error");
726 goto error;
727 }
728
1d4b027a
DG
729 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
730 if (sock < 0) {
731 goto error;
732 }
733
712ea556 734 /* Getting status code from kconsumerd */
1d4b027a
DG
735 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
736 if (ret <= 0) {
737 goto error;
738 }
739
740 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
741 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
742 if (kconsumerd_cmd_sock < 0) {
712ea556 743 sem_post(&kconsumerd_sem);
1d4b027a
DG
744 perror("kconsumerd connect");
745 goto error;
746 }
747 /* Signal condition to tell that the kconsumerd is ready */
748 sem_post(&kconsumerd_sem);
749 DBG("Kconsumerd command socket ready");
750 } else {
6f61d021 751 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
752 lttcomm_get_readable_code(-code));
753 goto error;
754 }
755
72079cae
DG
756 /* Kconsumerd err socket */
757 pollfd[1].fd = sock;
758 pollfd[1].events = POLLIN;
759
760 /* Inifinite blocking call, waiting for transmission */
761 ret = poll(pollfd, 2, -1);
762 if (ret < 0) {
763 perror("poll kconsumerd thread");
764 goto error;
765 }
766
767 /* Thread quit pipe has been closed. Killing thread. */
768 if (pollfd[0].revents == POLLNVAL) {
769 goto error;
770 } else if (pollfd[1].revents == POLLERR) {
771 ERR("Kconsumerd err socket second poll error");
772 goto error;
773 }
774
712ea556
DG
775 /* Wait for any kconsumerd error */
776 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
777 if (ret <= 0) {
778 ERR("Kconsumerd closed the command socket");
779 goto error;
6f61d021 780 }
1d4b027a 781
712ea556
DG
782 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
783
1d4b027a 784error:
6f61d021 785 DBG("Kconsumerd thread dying");
273ea72c
DG
786 if (kconsumerd_err_sock) {
787 close(kconsumerd_err_sock);
788 }
789 if (kconsumerd_cmd_sock) {
790 close(kconsumerd_cmd_sock);
791 }
792 if (sock) {
793 close(sock);
794 }
795
796 unlink(kconsumerd_err_unix_sock_path);
797 unlink(kconsumerd_cmd_unix_sock_path);
798
799 kconsumerd_pid = 0;
1d4b027a
DG
800 return NULL;
801}
802
803/*
1d4b027a
DG
804 * This thread manage the application socket communication
805 */
806static void *thread_manage_apps(void *data)
807{
273ea72c
DG
808 int sock = 0, ret;
809 struct pollfd pollfd[2];
1d4b027a
DG
810
811 /* TODO: Something more elegant is needed but fine for now */
812 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
813 * for 32-bit vs 64-bit compat processes. */
814 /* replicate in ust with version number */
815 struct {
816 int reg; /* 1:register, 0:unregister */
817 pid_t pid;
818 uid_t uid;
819 } reg_msg;
820
821 DBG("[thread] Manage apps started");
822
823 ret = lttcomm_listen_unix_sock(apps_sock);
824 if (ret < 0) {
825 goto error;
826 }
827
273ea72c
DG
828 /* First fd is always the quit pipe */
829 pollfd[0].fd = thread_quit_pipe[0];
830
831 /* Apps socket */
832 pollfd[1].fd = apps_sock;
833 pollfd[1].events = POLLIN;
834
1d4b027a
DG
835 /* Notify all applications to register */
836 notify_apps(default_global_apps_pipe);
837
838 while (1) {
839 DBG("Accepting application registration");
273ea72c
DG
840
841 /* Inifinite blocking call, waiting for transmission */
842 ret = poll(pollfd, 2, -1);
843 if (ret < 0) {
844 perror("poll apps thread");
845 goto error;
846 }
847
848 /* Thread quit pipe has been closed. Killing thread. */
849 if (pollfd[0].revents == POLLNVAL) {
850 goto error;
851 } else if (pollfd[1].revents == POLLERR) {
852 ERR("Apps socket poll error");
853 goto error;
854 }
855
1d4b027a
DG
856 sock = lttcomm_accept_unix_sock(apps_sock);
857 if (sock < 0) {
858 goto error;
859 }
860
273ea72c
DG
861 /*
862 * Basic recv here to handle the very simple data
1d4b027a
DG
863 * that the libust send to register (reg_msg).
864 */
865 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
866 if (ret < 0) {
867 perror("recv");
868 continue;
869 }
870
871 /* Add application to the global traceable list */
872 if (reg_msg.reg == 1) {
873 /* Registering */
874 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
875 if (ret < 0) {
876 /* register_traceable_app only return an error with
877 * ENOMEM. At this point, we better stop everything.
878 */
879 goto error;
880 }
881 } else {
882 /* Unregistering */
883 unregister_traceable_app(reg_msg.pid);
884 }
885 }
886
887error:
273ea72c
DG
888 DBG("Apps thread dying");
889 if (apps_sock) {
890 close(apps_sock);
891 }
892 if (sock) {
893 close(sock);
894 }
1d4b027a 895
273ea72c 896 unlink(apps_unix_sock_path);
1d4b027a
DG
897 return NULL;
898}
899
8c0faa1d 900/*
d063d709
DG
901 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
902 * exec or it will fails.
8c0faa1d 903 */
693bd40b 904static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
905{
906 int ret;
907
908 /* Setup semaphore */
909 sem_init(&kconsumerd_sem, 0, 0);
910
1d4b027a 911 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
912 if (ret != 0) {
913 perror("pthread_create kconsumerd");
914 goto error;
915 }
916
693bd40b 917 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
918 sem_wait(&kconsumerd_sem);
919
712ea556
DG
920 if (kconsumerd_pid == 0) {
921 ERR("Kconsumerd did not start");
922 goto error;
923 }
924
8c0faa1d
DG
925 return 0;
926
927error:
712ea556 928 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
929 return ret;
930}
931
d9800920
DG
932/*
933 * Join kernel consumer thread
934 */
cf3af59e
MD
935static int join_kconsumerd_thread(void)
936{
937 void *status;
938 int ret;
939
940 if (kconsumerd_pid != 0) {
941 ret = kill(kconsumerd_pid, SIGTERM);
942 if (ret) {
943 ERR("Error killing kconsumerd");
944 return ret;
945 }
946 return pthread_join(kconsumerd_thread, &status);
947 } else {
948 return 0;
949 }
950}
951
8c0faa1d 952/*
d063d709 953 * Fork and exec a kernel consumer daemon (kconsumerd).
8c0faa1d 954 *
d063d709 955 * Return pid if successful else -1.
8c0faa1d 956 */
693bd40b 957static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
958{
959 int ret;
960 pid_t pid;
53086306 961 const char *verbosity;
8c0faa1d 962
c49dc785
DG
963 DBG("Spawning kconsumerd");
964
8c0faa1d
DG
965 pid = fork();
966 if (pid == 0) {
967 /*
968 * Exec kconsumerd.
969 */
31f73cc9 970 if (opt_verbose > 1 || opt_verbose_kconsumerd) {
53086306
DG
971 verbosity = "--verbose";
972 } else {
973 verbosity = "--quiet";
974 }
975 execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL);
8c0faa1d
DG
976 if (errno != 0) {
977 perror("kernel start consumer exec");
978 }
979 exit(EXIT_FAILURE);
980 } else if (pid > 0) {
981 ret = pid;
982 goto error;
983 } else {
984 perror("kernel start consumer fork");
985 ret = -errno;
986 goto error;
987 }
988
989error:
990 return ret;
991}
992
693bd40b 993/*
d063d709 994 * Spawn the kconsumerd daemon and session daemon thread.
693bd40b
DG
995 */
996static int start_kconsumerd(void)
997{
998 int ret;
999
693bd40b 1000 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785 1001 if (kconsumerd_pid != 0) {
817153bb 1002 pthread_mutex_unlock(&kconsumerd_pid_mutex);
c49dc785
DG
1003 goto end;
1004 }
693bd40b 1005
c49dc785
DG
1006 ret = spawn_kconsumerd();
1007 if (ret < 0) {
1008 ERR("Spawning kconsumerd failed");
1009 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1010 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1011 goto error;
693bd40b 1012 }
c49dc785
DG
1013
1014 /* Setting up the global kconsumerd_pid */
1015 kconsumerd_pid = ret;
693bd40b
DG
1016 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1017
6f61d021
DG
1018 DBG("Kconsumerd pid %d", ret);
1019
693bd40b 1020 DBG("Spawning kconsumerd thread");
693bd40b
DG
1021 ret = spawn_kconsumerd_thread();
1022 if (ret < 0) {
1023 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
1024 goto error;
1025 }
1026
c49dc785 1027end:
693bd40b
DG
1028 return 0;
1029
1030error:
1031 return ret;
1032}
1033
b73401da 1034/*
d063d709 1035 * modprobe_kernel_modules
b73401da
DG
1036 */
1037static int modprobe_kernel_modules(void)
1038{
ab147185 1039 int ret = 0, i;
b73401da
DG
1040 char modprobe[256];
1041
ab147185
MD
1042 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1043 ret = snprintf(modprobe, sizeof(modprobe),
1044 "/sbin/modprobe %s%s",
1045 kernel_modules_list[i].required ? "" : "--quiet ",
1046 kernel_modules_list[i].name);
b73401da
DG
1047 if (ret < 0) {
1048 perror("snprintf modprobe");
1049 goto error;
1050 }
ab147185 1051 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1052 ret = system(modprobe);
ab147185
MD
1053 if (ret == -1) {
1054 ERR("Unable to launch modprobe for module %s",
1055 kernel_modules_list[i].name);
1056 } else if (kernel_modules_list[i].required
d9800920 1057 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1058 ERR("Unable to load module %s",
1059 kernel_modules_list[i].name);
1060 } else {
1061 DBG("Modprobe successfully %s",
1062 kernel_modules_list[i].name);
1063 }
1064 }
1065
1066error:
1067 return ret;
1068}
1069
1070/*
1071 * modprobe_remove_kernel_modules
1072 * Remove modules in reverse load order.
1073 */
1074static int modprobe_remove_kernel_modules(void)
1075{
1076 int ret = 0, i;
1077 char modprobe[256];
1078
1079 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
1080 ret = snprintf(modprobe, sizeof(modprobe),
1081 "/sbin/modprobe --remove --quiet %s",
1082 kernel_modules_list[i].name);
b73401da 1083 if (ret < 0) {
ab147185
MD
1084 perror("snprintf modprobe --remove");
1085 goto error;
1086 }
1087 modprobe[sizeof(modprobe) - 1] = '\0';
1088 ret = system(modprobe);
1089 if (ret == -1) {
1090 ERR("Unable to launch modprobe --remove for module %s",
1091 kernel_modules_list[i].name);
1092 } else if (kernel_modules_list[i].required
d9800920 1093 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1094 ERR("Unable to remove module %s",
1095 kernel_modules_list[i].name);
1096 } else {
1097 DBG("Modprobe removal successful %s",
1098 kernel_modules_list[i].name);
b73401da 1099 }
b73401da
DG
1100 }
1101
1102error:
1103 return ret;
1104}
1105
1106/*
d063d709 1107 * mount_debugfs
b73401da
DG
1108 */
1109static int mount_debugfs(char *path)
1110{
1111 int ret;
1112 char *type = "debugfs";
1113
996b65c8 1114 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da
DG
1115 if (ret < 0) {
1116 goto error;
1117 }
1118
1119 ret = mount(type, path, type, 0, NULL);
1120 if (ret < 0) {
1121 perror("mount debugfs");
1122 goto error;
1123 }
1124
1125 DBG("Mounted debugfs successfully at %s", path);
1126
1127error:
1128 return ret;
1129}
1130
8c0faa1d 1131/*
d063d709 1132 * Setup necessary data for kernel tracer action.
8c0faa1d 1133 */
f3ed775e 1134static void init_kernel_tracer(void)
8c0faa1d 1135{
b73401da
DG
1136 int ret;
1137 char *proc_mounts = "/proc/mounts";
1138 char line[256];
1139 char *debugfs_path = NULL, *lttng_path;
1140 FILE *fp;
1141
1142 /* Detect debugfs */
1143 fp = fopen(proc_mounts, "r");
1144 if (fp == NULL) {
1145 ERR("Unable to probe %s", proc_mounts);
1146 goto error;
1147 }
1148
1149 while (fgets(line, sizeof(line), fp) != NULL) {
1150 if (strstr(line, "debugfs") != NULL) {
1151 /* Remove first string */
1152 strtok(line, " ");
1153 /* Dup string here so we can reuse line later on */
1154 debugfs_path = strdup(strtok(NULL, " "));
1155 DBG("Got debugfs path : %s", debugfs_path);
1156 break;
1157 }
1158 }
1159
1160 fclose(fp);
1161
1162 /* Mount debugfs if needded */
1163 if (debugfs_path == NULL) {
1164 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1165 if (ret < 0) {
1166 perror("asprintf debugfs path");
1167 goto error;
1168 }
1169 ret = mount_debugfs(debugfs_path);
1170 if (ret < 0) {
1171 goto error;
1172 }
1173 }
1174
1175 /* Modprobe lttng kernel modules */
1176 ret = modprobe_kernel_modules();
1177 if (ret < 0) {
1178 goto error;
1179 }
1180
1181 /* Setup lttng kernel path */
1182 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1183 if (ret < 0) {
1184 perror("asprintf lttng path");
1185 goto error;
1186 }
1187
1188 /* Open debugfs lttng */
1189 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1190 if (kernel_tracer_fd < 0) {
b73401da
DG
1191 DBG("Failed to open %s", lttng_path);
1192 goto error;
8c0faa1d
DG
1193 }
1194
b73401da
DG
1195 free(lttng_path);
1196 free(debugfs_path);
f3ed775e 1197 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1198 return;
1199
1200error:
1201 if (lttng_path) {
1202 free(lttng_path);
1203 }
1204 if (debugfs_path) {
1205 free(debugfs_path);
1206 }
1207 WARN("No kernel tracer available");
1208 kernel_tracer_fd = 0;
1209 return;
f3ed775e 1210}
33a2b854 1211
f3ed775e 1212/*
d063d709
DG
1213 * Start tracing by creating trace directory and sending FDs to the kernel
1214 * consumer.
f3ed775e
DG
1215 */
1216static int start_kernel_trace(struct ltt_kernel_session *session)
1217{
f40799e8 1218 int ret = 0;
8c0faa1d 1219
f3ed775e 1220 if (session->kconsumer_fds_sent == 0) {
d9800920
DG
1221 /*
1222 * Assign default kernel consumer if no consumer assigned to the kernel
1223 * session. At this point, it's NOT suppose to be 0 but this is an extra
1224 * security check.
1225 */
1226 if (session->consumer_fd == 0) {
1227 session->consumer_fd = kconsumerd_cmd_sock;
1228 }
1229
1230 ret = send_kconsumerd_fds(session);
f3ed775e
DG
1231 if (ret < 0) {
1232 ERR("Send kconsumerd fds failed");
1233 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1234 goto error;
1235 }
1d4b027a 1236
f3ed775e
DG
1237 session->kconsumer_fds_sent = 1;
1238 }
1d4b027a
DG
1239
1240error:
1241 return ret;
8c0faa1d
DG
1242}
1243
7a485870
DG
1244/*
1245 * Notify kernel thread to update it's pollfd.
1246 */
1247static int notify_kernel_pollfd(void)
1248{
1249 int ret;
1250
1251 /* Inform kernel thread of the new kernel channel */
1252 ret = write(kernel_poll_pipe[1], "!", 1);
1253 if (ret < 0) {
1254 perror("write kernel poll pipe");
1255 }
1256
1257 return ret;
1258}
1259
8c0faa1d 1260/*
d063d709 1261 * Allocate a channel structure and fill it.
8c0faa1d 1262 */
b389abbe
MD
1263static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type,
1264 char *name)
8c0faa1d 1265{
f3ed775e 1266 struct lttng_channel *chan;
1d4b027a 1267
f3ed775e
DG
1268 chan = malloc(sizeof(struct lttng_channel));
1269 if (chan == NULL) {
1270 perror("init channel malloc");
1271 goto error;
8c0faa1d 1272 }
1d4b027a 1273
ed8f384d 1274 if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) {
9f19cc17 1275 perror("snprintf channel name");
b389abbe 1276 goto error;
f3ed775e
DG
1277 }
1278
1279 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
f3ed775e
DG
1280 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
1281 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
1d4b027a 1282
b389abbe
MD
1283 switch (domain_type) {
1284 case LTTNG_DOMAIN_KERNEL:
1285 chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
1286 chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
1287 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1288 break;
1289 /* TODO: add UST */
1290 default:
1291 goto error; /* Not implemented */
1292 }
1293
f3ed775e 1294 return chan;
b389abbe
MD
1295
1296error:
1297 free(chan);
1298 return NULL;
8c0faa1d
DG
1299}
1300
333f285e 1301/*
d063d709 1302 * Create a kernel tracer session then create the default channel.
333f285e 1303 */
f3ed775e 1304static int create_kernel_session(struct ltt_session *session)
333f285e 1305{
f3ed775e 1306 int ret;
f3ed775e
DG
1307
1308 DBG("Creating kernel session");
1309
1310 ret = kernel_create_session(session, kernel_tracer_fd);
1311 if (ret < 0) {
1312 ret = LTTCOMM_KERN_SESS_FAIL;
1313 goto error;
333f285e
DG
1314 }
1315
d9800920
DG
1316 /* Set kernel consumer socket fd */
1317 if (kconsumerd_cmd_sock) {
1318 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1319 }
1320
63053e7c
DG
1321 ret = asprintf(&session->kernel_session->trace_path, "%s/kernel",
1322 session->path);
1323 if (ret < 0) {
1324 perror("asprintf kernel traces path");
1325 goto error;
1326 }
1327
1328 ret = mkdir_recursive(session->kernel_session->trace_path,
1329 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1330 if (ret < 0) {
996b65c8 1331 if (ret != -EEXIST) {
7a485870
DG
1332 ERR("Trace directory creation error");
1333 goto error;
1334 }
1335 }
1336
f3ed775e
DG
1337error:
1338 return ret;
333f285e
DG
1339}
1340
6c9cc2ab
DG
1341/*
1342 * Using the session list, filled a lttng_session array to send back to the
1343 * client for session listing.
1344 *
1345 * The session list lock MUST be acquired before calling this function. Use
1346 * lock_session_list() and unlock_session_list().
1347 */
1348static void list_lttng_sessions(struct lttng_session *sessions)
1349{
1350 int i = 0;
1351 struct ltt_session *session;
1352
1353 DBG("Getting all available session");
1354 /*
1355 * Iterate over session list and append data after the control struct in
1356 * the buffer.
1357 */
1358 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1359 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1360 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1361 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1362 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1363 i++;
1364 }
1365}
1366
9f19cc17
DG
1367/*
1368 * Fill lttng_channel array of all channels.
1369 */
1370static void list_lttng_channels(struct ltt_session *session,
1371 struct lttng_channel *channels)
1372{
1373 int i = 0;
1374 struct ltt_kernel_channel *kchan;
1375
1376 DBG("Listing channels for session %s", session->name);
1377
1378 /* Kernel channels */
1379 if (session->kernel_session != NULL) {
1380 cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) {
1381 /* Copy lttng_channel struct to array */
1382 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1383 channels[i].enabled = kchan->enabled;
1384 i++;
1385 }
1386 }
1387
1388 /* TODO: Missing UST listing */
1389}
1390
1391/*
1392 * Fill lttng_event array of all events in the channel.
1393 */
1394static void list_lttng_events(struct ltt_kernel_channel *kchan,
1395 struct lttng_event *events)
1396{
1397 /*
1398 * TODO: This is ONLY kernel. Need UST support.
1399 */
1400 int i = 0;
1401 struct ltt_kernel_event *event;
1402
1403 DBG("Listing events for channel %s", kchan->channel->name);
1404
1405 /* Kernel channels */
1406 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1407 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1408 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1409 events[i].enabled = event->enabled;
1410 switch (event->event->instrumentation) {
1411 case LTTNG_KERNEL_TRACEPOINT:
1412 events[i].type = LTTNG_EVENT_TRACEPOINT;
1413 break;
1414 case LTTNG_KERNEL_KPROBE:
1415 case LTTNG_KERNEL_KRETPROBE:
1416 events[i].type = LTTNG_EVENT_PROBE;
1417 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1418 sizeof(struct lttng_kernel_kprobe));
1419 break;
1420 case LTTNG_KERNEL_FUNCTION:
1421 events[i].type = LTTNG_EVENT_FUNCTION;
1422 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1423 sizeof(struct lttng_kernel_function));
1424 break;
1425 }
1426 i++;
1427 }
1428}
1429
fac6795d 1430/*
d063d709
DG
1431 * Process the command requested by the lttng client within the command
1432 * context structure. This function make sure that the return structure (llm)
1433 * is set and ready for transmission before returning.
fac6795d 1434 *
e065084a 1435 * Return any error encountered or 0 for success.
fac6795d 1436 */
5461b305 1437static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 1438{
f40799e8 1439 int ret = LTTCOMM_OK;
fac6795d 1440
5461b305 1441 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 1442
63053e7c
DG
1443 /*
1444 * Commands that DO NOT need a session.
1445 */
5461b305 1446 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
1447 case LTTNG_CREATE_SESSION:
1448 case LTTNG_LIST_SESSIONS:
052da939 1449 case LTTNG_LIST_TRACEPOINTS:
d0254c7c 1450 case LTTNG_CALIBRATE:
5e16da05
MD
1451 break;
1452 default:
42abccdb
DG
1453 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
1454 cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name);
5461b305 1455 if (cmd_ctx->session == NULL) {
f3ed775e 1456 /* If session name not found */
42abccdb 1457 if (cmd_ctx->lsm->session.name != NULL) {
f3ed775e
DG
1458 ret = LTTCOMM_SESS_NOT_FOUND;
1459 } else { /* If no session name specified */
1460 ret = LTTCOMM_SELECT_SESS;
1461 }
5461b305 1462 goto error;
b5541356
DG
1463 } else {
1464 /* Acquire lock for the session */
1465 lock_session(cmd_ctx->session);
379473d2 1466 }
5e16da05 1467 break;
379473d2
DG
1468 }
1469
f3ed775e 1470 /*
d0254c7c 1471 * Check domain type for specific "pre-action".
f3ed775e 1472 */
0d0c377a
DG
1473 switch (cmd_ctx->lsm->domain.type) {
1474 case LTTNG_DOMAIN_KERNEL:
333f285e 1475 /* Kernel tracer check */
20fe2104 1476 if (kernel_tracer_fd == 0) {
333f285e
DG
1477 init_kernel_tracer();
1478 if (kernel_tracer_fd == 0) {
1479 ret = LTTCOMM_KERN_NA;
1480 goto error;
1481 }
20fe2104 1482 }
f3ed775e
DG
1483
1484 /* Need a session for kernel command */
d0254c7c 1485 switch (cmd_ctx->lsm->cmd_type) {
d9800920 1486 case LTTNG_CALIBRATE:
d0254c7c
MD
1487 case LTTNG_CREATE_SESSION:
1488 case LTTNG_LIST_SESSIONS:
1489 case LTTNG_LIST_TRACEPOINTS:
d0254c7c
MD
1490 break;
1491 default:
1492 if (cmd_ctx->session->kernel_session == NULL) {
1493 ret = create_kernel_session(cmd_ctx->session);
f3ed775e 1494 if (ret < 0) {
d0254c7c 1495 ret = LTTCOMM_KERN_SESS_FAIL;
f3ed775e
DG
1496 goto error;
1497 }
d0254c7c
MD
1498
1499 /* Start the kernel consumer daemon */
d9800920
DG
1500
1501 if (kconsumerd_pid == 0 &&
1502 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
d0254c7c
MD
1503 ret = start_kconsumerd();
1504 if (ret < 0) {
1505 goto error;
1506 }
1507 }
f3ed775e
DG
1508 }
1509 }
0d0c377a
DG
1510 break;
1511 default:
1512 break;
20fe2104
DG
1513 }
1514
fac6795d 1515 /* Process by command type */
5461b305 1516 switch (cmd_ctx->lsm->cmd_type) {
b579acd9 1517 case LTTNG_ADD_CONTEXT:
d65106b1 1518 {
b579acd9 1519 struct lttng_kernel_context kctx;
d65106b1
DG
1520
1521 /* Setup lttng message with no payload */
1522 ret = setup_lttng_msg(cmd_ctx, 0);
1523 if (ret < 0) {
1524 goto setup_error;
1525 }
1526
b579acd9
DG
1527 switch (cmd_ctx->lsm->domain.type) {
1528 case LTTNG_DOMAIN_KERNEL:
1529 /* Create Kernel context */
1530 kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx;
1531 kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type;
1532 kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config;
1533 strncpy(kctx.u.perf_counter.name,
1534 cmd_ctx->lsm->u.context.ctx.u.perf_counter.name,
1535 LTTNG_SYMBOL_NAME_LEN);
99497cd0 1536 kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9
DG
1537
1538 /* Add kernel context to kernel tracer. See context.c */
1539 ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx,
1540 cmd_ctx->lsm->u.context.event_name,
1541 cmd_ctx->lsm->u.context.channel_name);
1542 if (ret != LTTCOMM_OK) {
d65106b1
DG
1543 goto error;
1544 }
b579acd9
DG
1545 break;
1546 default:
1547 /* TODO: Userspace tracing */
1548 ret = LTTCOMM_NOT_IMPLEMENTED;
0b97ec54 1549 goto error;
d65106b1
DG
1550 }
1551
1552 ret = LTTCOMM_OK;
1553 break;
1554 }
0b97ec54 1555 case LTTNG_DISABLE_CHANNEL:
26cc6b4e 1556 {
0b97ec54 1557 struct ltt_kernel_channel *kchan;
26cc6b4e
DG
1558
1559 /* Setup lttng message with no payload */
1560 ret = setup_lttng_msg(cmd_ctx, 0);
1561 if (ret < 0) {
1562 goto setup_error;
1563 }
1564
0b97ec54
DG
1565 switch (cmd_ctx->lsm->domain.type) {
1566 case LTTNG_DOMAIN_KERNEL:
1567 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1568 cmd_ctx->session->kernel_session);
1569 if (kchan == NULL) {
1570 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
26cc6b4e 1571 goto error;
0b97ec54
DG
1572 } else if (kchan->enabled == 1) {
1573 ret = kernel_disable_channel(kchan);
1574 if (ret < 0) {
1575 if (ret != EEXIST) {
1576 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
1577 }
1578 goto error;
1579 }
26cc6b4e 1580 }
0b97ec54
DG
1581 kernel_wait_quiescent(kernel_tracer_fd);
1582 break;
1583 default:
1584 /* TODO: Userspace tracing */
1585 ret = LTTCOMM_NOT_IMPLEMENTED;
1586 goto error;
26cc6b4e
DG
1587 }
1588
26cc6b4e
DG
1589 ret = LTTCOMM_OK;
1590 break;
1591 }
f5177a38 1592 case LTTNG_DISABLE_EVENT:
e953ef25 1593 {
f5177a38
DG
1594 struct ltt_kernel_channel *kchan;
1595 struct ltt_kernel_event *kevent;
e953ef25
DG
1596
1597 /* Setup lttng message with no payload */
1598 ret = setup_lttng_msg(cmd_ctx, 0);
1599 if (ret < 0) {
1600 goto setup_error;
1601 }
1602
f5177a38
DG
1603 switch (cmd_ctx->lsm->domain.type) {
1604 case LTTNG_DOMAIN_KERNEL:
1605 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1606 cmd_ctx->session->kernel_session);
1607 if (kchan == NULL) {
1608 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
19e70852 1609 goto error;
e953ef25 1610 }
f5177a38
DG
1611
1612 kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan);
1613 if (kevent != NULL) {
1614 DBG("Disabling kernel event %s for channel %s.", kevent->event->name,
1615 kchan->channel->name);
1616 ret = kernel_disable_event(kevent);
1617 if (ret < 0) {
1618 ret = LTTCOMM_KERN_ENABLE_FAIL;
1619 goto error;
1620 }
1621 }
1622
1623 kernel_wait_quiescent(kernel_tracer_fd);
1624 break;
1625 default:
1626 /* TODO: Userspace tracing */
1627 ret = LTTCOMM_NOT_IMPLEMENTED;
1628 goto error;
e953ef25
DG
1629 }
1630
19e70852 1631 ret = LTTCOMM_OK;
e953ef25
DG
1632 break;
1633 }
f5177a38 1634 case LTTNG_DISABLE_ALL_EVENT:
950131af 1635 {
f5177a38
DG
1636 struct ltt_kernel_channel *kchan;
1637 struct ltt_kernel_event *kevent;
950131af
DG
1638
1639 /* Setup lttng message with no payload */
1640 ret = setup_lttng_msg(cmd_ctx, 0);
1641 if (ret < 0) {
1642 goto setup_error;
1643 }
1644
f5177a38
DG
1645 switch (cmd_ctx->lsm->domain.type) {
1646 case LTTNG_DOMAIN_KERNEL:
1647 DBG("Disabling all enabled kernel events");
1648 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1649 cmd_ctx->session->kernel_session);
1650 if (kchan == NULL) {
1651 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1652 goto error;
1653 }
950131af 1654
f5177a38
DG
1655 /* For each event in the kernel session */
1656 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
1657 DBG("Disabling kernel event %s for channel %s.",
1658 kevent->event->name, kchan->channel->name);
1659 ret = kernel_disable_event(kevent);
1660 if (ret < 0) {
1661 continue;
1662 }
950131af 1663 }
f5177a38
DG
1664
1665 /* Quiescent wait after event disable */
1666 kernel_wait_quiescent(kernel_tracer_fd);
1667 break;
1668 default:
1669 /* TODO: Userspace tracing */
1670 ret = LTTCOMM_NOT_IMPLEMENTED;
1671 goto error;
950131af
DG
1672 }
1673
950131af
DG
1674 ret = LTTCOMM_OK;
1675 break;
1676 }
0d0c377a 1677 case LTTNG_ENABLE_CHANNEL:
d36b8583 1678 {
0d0c377a 1679 struct ltt_kernel_channel *kchan;
d36b8583
DG
1680
1681 /* Setup lttng message with no payload */
1682 ret = setup_lttng_msg(cmd_ctx, 0);
1683 if (ret < 0) {
1684 goto setup_error;
1685 }
1686
0d0c377a
DG
1687 switch (cmd_ctx->lsm->domain.type) {
1688 case LTTNG_DOMAIN_KERNEL:
1689 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1690 cmd_ctx->session->kernel_session);
1691 if (kchan == NULL) {
1692 /* Channel not found, creating it */
1693 DBG("Creating kernel channel");
7d29a247 1694
0d0c377a 1695 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
63053e7c
DG
1696 &cmd_ctx->lsm->u.channel.chan,
1697 cmd_ctx->session->kernel_session->trace_path);
0d0c377a
DG
1698 if (ret < 0) {
1699 ret = LTTCOMM_KERN_CHAN_FAIL;
1700 goto error;
1701 }
7d29a247 1702
0d0c377a
DG
1703 /* Notify kernel thread that there is a new channel */
1704 ret = notify_kernel_pollfd();
1705 if (ret < 0) {
1706 ret = LTTCOMM_FATAL;
1707 goto error;
1708 }
1709 } else if (kchan->enabled == 0) {
1710 ret = kernel_enable_channel(kchan);
1711 if (ret < 0) {
1712 if (ret != EEXIST) {
1713 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
1714 }
1715 goto error;
d36b8583 1716 }
d36b8583 1717 }
0d0c377a
DG
1718
1719 kernel_wait_quiescent(kernel_tracer_fd);
1720 break;
1721 default:
1722 /* TODO: Userspace tracing */
1723 ret = LTTCOMM_NOT_IMPLEMENTED;
1724 goto error;
d36b8583
DG
1725 }
1726
d36b8583
DG
1727 ret = LTTCOMM_OK;
1728 break;
1729 }
0d0c377a 1730 case LTTNG_ENABLE_EVENT:
894be886 1731 {
7d29a247
DG
1732 char *channel_name;
1733 struct ltt_kernel_channel *kchan;
0d0c377a 1734 struct ltt_kernel_event *kevent;
7d29a247 1735 struct lttng_channel *chan;
f3ed775e 1736
894be886
DG
1737 /* Setup lttng message with no payload */
1738 ret = setup_lttng_msg(cmd_ctx, 0);
1739 if (ret < 0) {
1740 goto setup_error;
1741 }
1742
7d29a247
DG
1743 channel_name = cmd_ctx->lsm->u.enable.channel_name;
1744
0d0c377a
DG
1745 switch (cmd_ctx->lsm->domain.type) {
1746 case LTTNG_DOMAIN_KERNEL:
b389abbe
MD
1747 kchan = get_kernel_channel_by_name(channel_name,
1748 cmd_ctx->session->kernel_session);
1749 if (kchan == NULL) {
1750 DBG("Channel not found. Creating channel %s", channel_name);
1751
1752 chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name);
1753 if (chan == NULL) {
1754 ret = LTTCOMM_FATAL;
1755 goto error;
1756 }
1757
1758 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
1759 chan, cmd_ctx->session->kernel_session->trace_path);
1760 if (ret < 0) {
1761 ret = LTTCOMM_KERN_CHAN_FAIL;
1762 goto error;
1763 }
0d0c377a
DG
1764 kchan = get_kernel_channel_by_name(channel_name,
1765 cmd_ctx->session->kernel_session);
1766 if (kchan == NULL) {
b389abbe
MD
1767 ERR("Channel %s not found after creation. Internal error, giving up.",
1768 channel_name);
1769 ret = LTTCOMM_FATAL;
1770 goto error;
7d29a247 1771 }
b389abbe 1772 }
7d29a247 1773
0d0c377a
DG
1774 kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan);
1775 if (kevent == NULL) {
1776 DBG("Creating kernel event %s for channel %s.",
1777 cmd_ctx->lsm->u.enable.event.name, channel_name);
1778 ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan);
1779 } else {
1780 DBG("Enabling kernel event %s for channel %s.",
1781 kevent->event->name, channel_name);
1782 ret = kernel_enable_event(kevent);
1783 if (ret == -EEXIST) {
1784 ret = LTTCOMM_KERN_EVENT_EXIST;
7d29a247
DG
1785 goto error;
1786 }
1787 }
f34daff7 1788
0d0c377a
DG
1789 if (ret < 0) {
1790 ret = LTTCOMM_KERN_ENABLE_FAIL;
7d29a247
DG
1791 goto error;
1792 }
19e70852 1793
0d0c377a
DG
1794 kernel_wait_quiescent(kernel_tracer_fd);
1795 break;
1796 default:
1797 /* TODO: Userspace tracing */
1798 ret = LTTCOMM_NOT_IMPLEMENTED;
19e70852 1799 goto error;
f3ed775e 1800 }
19e70852 1801 ret = LTTCOMM_OK;
894be886
DG
1802 break;
1803 }
0d0c377a 1804 case LTTNG_ENABLE_ALL_EVENT:
33a2b854 1805 {
9f19cc17
DG
1806 int size, i;
1807 char *channel_name;
7d29a247 1808 struct ltt_kernel_channel *kchan;
0d0c377a 1809 struct ltt_kernel_event *kevent;
9f19cc17 1810 struct lttng_event *event_list;
7d29a247 1811 struct lttng_channel *chan;
33a2b854
DG
1812
1813 /* Setup lttng message with no payload */
1814 ret = setup_lttng_msg(cmd_ctx, 0);
1815 if (ret < 0) {
1816 goto setup_error;
1817 }
1818
1819 DBG("Enabling all kernel event");
1820
7d29a247
DG
1821 channel_name = cmd_ctx->lsm->u.enable.channel_name;
1822
0d0c377a
DG
1823 switch (cmd_ctx->lsm->domain.type) {
1824 case LTTNG_DOMAIN_KERNEL:
b389abbe
MD
1825 kchan = get_kernel_channel_by_name(channel_name,
1826 cmd_ctx->session->kernel_session);
1827 if (kchan == NULL) {
1828 DBG("Channel not found. Creating channel %s", channel_name);
1829
1830 chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name);
1831 if (chan == NULL) {
1832 ret = LTTCOMM_FATAL;
1833 goto error;
1834 }
1835
1836 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
1837 chan, cmd_ctx->session->kernel_session->trace_path);
1838 if (ret < 0) {
1839 ret = LTTCOMM_KERN_CHAN_FAIL;
1840 goto error;
1841 }
0d0c377a
DG
1842 kchan = get_kernel_channel_by_name(channel_name,
1843 cmd_ctx->session->kernel_session);
1844 if (kchan == NULL) {
b389abbe
MD
1845 ERR("Channel %s not found after creation. Internal error, giving up.",
1846 channel_name);
1847 ret = LTTCOMM_FATAL;
1848 goto error;
7d29a247 1849 }
b389abbe 1850 }
7d29a247 1851
0d0c377a
DG
1852 /* For each event in the kernel session */
1853 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
1854 DBG("Enabling kernel event %s for channel %s.",
1855 kevent->event->name, channel_name);
1856 ret = kernel_enable_event(kevent);
7d29a247 1857 if (ret < 0) {
0d0c377a 1858 continue;
7d29a247
DG
1859 }
1860 }
33a2b854 1861
0d0c377a
DG
1862 size = kernel_list_events(kernel_tracer_fd, &event_list);
1863 if (size < 0) {
1864 ret = LTTCOMM_KERN_LIST_FAIL;
1865 goto error;
f3ed775e 1866 }
f3ed775e 1867
0d0c377a
DG
1868 for (i = 0; i < size; i++) {
1869 kevent = get_kernel_event_by_name(event_list[i].name, kchan);
1870 if (kevent == NULL) {
1871 /* Default event type for enable all */
1872 event_list[i].type = LTTNG_EVENT_TRACEPOINT;
1873 /* Enable each single tracepoint event */
1874 ret = kernel_create_event(&event_list[i], kchan);
1875 if (ret < 0) {
1876 /* Ignore error here and continue */
1877 }
950131af 1878 }
33a2b854 1879 }
33a2b854 1880
0d0c377a
DG
1881 free(event_list);
1882
1883 /* Quiescent wait after event enable */
1884 kernel_wait_quiescent(kernel_tracer_fd);
1885 break;
1886 default:
1887 /* TODO: Userspace tracing */
1888 ret = LTTCOMM_NOT_IMPLEMENTED;
1889 goto error;
1890 }
33a2b854
DG
1891
1892 ret = LTTCOMM_OK;
1893 break;
1894 }
052da939 1895 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 1896 {
9f19cc17 1897 struct lttng_event *events;
052da939
DG
1898 ssize_t nb_events = 0;
1899
1900 switch (cmd_ctx->lsm->domain.type) {
1901 case LTTNG_DOMAIN_KERNEL:
1902 DBG("Listing kernel events");
1903 nb_events = kernel_list_events(kernel_tracer_fd, &events);
1904 if (nb_events < 0) {
1905 ret = LTTCOMM_KERN_LIST_FAIL;
1906 goto error;
1907 }
1908 break;
1909 default:
1910 /* TODO: Userspace listing */
1911 ret = LTTCOMM_NOT_IMPLEMENTED;
1912 break;
2ef84c95
DG
1913 }
1914
1915 /*
1916 * Setup lttng message with payload size set to the event list size in
1917 * bytes and then copy list into the llm payload.
1918 */
052da939 1919 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 1920 if (ret < 0) {
052da939 1921 free(events);
2ef84c95
DG
1922 goto setup_error;
1923 }
1924
1925 /* Copy event list into message payload */
9f19cc17 1926 memcpy(cmd_ctx->llm->payload, events,
052da939 1927 sizeof(struct lttng_event) * nb_events);
2ef84c95 1928
9f19cc17 1929 free(events);
2ef84c95
DG
1930
1931 ret = LTTCOMM_OK;
1932 break;
1933 }
f3ed775e 1934 case LTTNG_START_TRACE:
8c0faa1d
DG
1935 {
1936 struct ltt_kernel_channel *chan;
f3ed775e 1937
8c0faa1d
DG
1938 /* Setup lttng message with no payload */
1939 ret = setup_lttng_msg(cmd_ctx, 0);
1940 if (ret < 0) {
1941 goto setup_error;
1942 }
1943
f3ed775e
DG
1944 /* Kernel tracing */
1945 if (cmd_ctx->session->kernel_session != NULL) {
1946 if (cmd_ctx->session->kernel_session->metadata == NULL) {
1947 DBG("Open kernel metadata");
58a97671 1948 ret = kernel_open_metadata(cmd_ctx->session->kernel_session,
63053e7c 1949 cmd_ctx->session->kernel_session->trace_path);
f3ed775e
DG
1950 if (ret < 0) {
1951 ret = LTTCOMM_KERN_META_FAIL;
1952 goto error;
1953 }
1954 }
8c0faa1d 1955
f3ed775e
DG
1956 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1957 DBG("Opening kernel metadata stream");
1958 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1959 ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
1960 if (ret < 0) {
1961 ERR("Kernel create metadata stream failed");
1962 ret = LTTCOMM_KERN_STREAM_FAIL;
1963 goto error;
1964 }
1965 }
1966 }
8c0faa1d 1967
f3ed775e 1968 /* For each channel */
0d0c377a
DG
1969 cds_list_for_each_entry(chan,
1970 &cmd_ctx->session->kernel_session->channel_list.head, list) {
f3ed775e
DG
1971 if (chan->stream_count == 0) {
1972 ret = kernel_open_channel_stream(chan);
1973 if (ret < 0) {
1974 ERR("Kernel create channel stream failed");
1975 ret = LTTCOMM_KERN_STREAM_FAIL;
1976 goto error;
1977 }
1978 /* Update the stream global counter */
1979 cmd_ctx->session->kernel_session->stream_count_global += ret;
1980 }
1981 }
1982
283046e0 1983 ret = start_kernel_trace(cmd_ctx->session->kernel_session);
8c0faa1d 1984 if (ret < 0) {
f3ed775e 1985 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1986 goto error;
1987 }
8c0faa1d 1988
283046e0
DG
1989 DBG("Start kernel tracing");
1990 ret = kernel_start_session(cmd_ctx->session->kernel_session);
f3ed775e 1991 if (ret < 0) {
283046e0 1992 ERR("Kernel start session failed");
f3ed775e 1993 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1994 goto error;
1995 }
8c0faa1d 1996
f3ed775e
DG
1997 /* Quiescent wait after starting trace */
1998 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1999 }
2000
f3ed775e 2001 /* TODO: Start all UST traces */
8c0faa1d
DG
2002
2003 ret = LTTCOMM_OK;
2004 break;
2005 }
f3ed775e 2006 case LTTNG_STOP_TRACE:
8c0faa1d 2007 {
f3ed775e 2008 struct ltt_kernel_channel *chan;
8c0faa1d
DG
2009 /* Setup lttng message with no payload */
2010 ret = setup_lttng_msg(cmd_ctx, 0);
2011 if (ret < 0) {
2012 goto setup_error;
2013 }
2014
f3ed775e
DG
2015 /* Kernel tracer */
2016 if (cmd_ctx->session->kernel_session != NULL) {
2017 DBG("Stop kernel tracing");
84291629 2018
f3ed775e
DG
2019 ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
2020 if (ret < 0) {
2021 ERR("Kernel metadata flush failed");
2022 }
8c0faa1d 2023
f3ed775e
DG
2024 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
2025 ret = kernel_flush_buffer(chan);
2026 if (ret < 0) {
2027 ERR("Kernel flush buffer error");
2028 }
2029 }
2030
2031 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
2032 if (ret < 0) {
2033 ERR("Kernel stop session failed");
2034 ret = LTTCOMM_KERN_STOP_FAIL;
2035 goto error;
2036 }
2037
2038 /* Quiescent wait after stopping trace */
2039 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
2040 }
2041
f3ed775e 2042 /* TODO : User-space tracer */
8c0faa1d
DG
2043
2044 ret = LTTCOMM_OK;
2045 break;
2046 }
5e16da05
MD
2047 case LTTNG_CREATE_SESSION:
2048 {
5461b305
DG
2049 /* Setup lttng message with no payload */
2050 ret = setup_lttng_msg(cmd_ctx, 0);
2051 if (ret < 0) {
2052 goto setup_error;
2053 }
2054
42abccdb 2055 ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path);
5e16da05 2056 if (ret < 0) {
f3ed775e 2057 if (ret == -EEXIST) {
5e16da05
MD
2058 ret = LTTCOMM_EXIST_SESS;
2059 } else {
aaf97519 2060 ret = LTTCOMM_FATAL;
aaf97519 2061 }
5461b305 2062 goto error;
8028d920 2063 }
1657e9bb 2064
5461b305 2065 ret = LTTCOMM_OK;
5e16da05
MD
2066 break;
2067 }
2068 case LTTNG_DESTROY_SESSION:
2069 {
5461b305
DG
2070 /* Setup lttng message with no payload */
2071 ret = setup_lttng_msg(cmd_ctx, 0);
2072 if (ret < 0) {
2073 goto setup_error;
2074 }
2075
f3ed775e
DG
2076 /* Clean kernel session teardown */
2077 teardown_kernel_session(cmd_ctx->session);
2078
42abccdb 2079 ret = destroy_session(cmd_ctx->lsm->session.name);
5e16da05 2080 if (ret < 0) {
f3ed775e 2081 ret = LTTCOMM_FATAL;
5461b305 2082 goto error;
5e16da05 2083 }
1657e9bb 2084
7a485870
DG
2085 /*
2086 * Must notify the kernel thread here to update it's pollfd in order to
2087 * remove the channel(s)' fd just destroyed.
2088 */
2089 ret = notify_kernel_pollfd();
2090 if (ret < 0) {
2091 ret = LTTCOMM_FATAL;
2092 goto error;
2093 }
2094
5461b305
DG
2095 ret = LTTCOMM_OK;
2096 break;
5e16da05 2097 }
9f19cc17 2098 case LTTNG_LIST_DOMAINS:
5e16da05 2099 {
4b222185 2100 size_t nb_dom = 0;
5461b305 2101
9f19cc17
DG
2102 if (cmd_ctx->session->kernel_session != NULL) {
2103 nb_dom++;
ce3d728c 2104 }
520ff687 2105
9f19cc17
DG
2106 nb_dom += cmd_ctx->session->ust_trace_count;
2107
2108 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom);
5461b305
DG
2109 if (ret < 0) {
2110 goto setup_error;
520ff687 2111 }
57167058 2112
9f19cc17
DG
2113 ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type =
2114 LTTNG_DOMAIN_KERNEL;
5e16da05 2115
9f19cc17 2116 /* TODO: User-space tracer domain support */
5461b305 2117 ret = LTTCOMM_OK;
5e16da05
MD
2118 break;
2119 }
9f19cc17 2120 case LTTNG_LIST_CHANNELS:
5e16da05 2121 {
9f19cc17
DG
2122 /*
2123 * TODO: Only kernel channels are listed here. UST listing
2124 * is needed on lttng-ust 2.0 release.
2125 */
2126 size_t nb_chan = 0;
2127 if (cmd_ctx->session->kernel_session != NULL) {
2128 nb_chan += cmd_ctx->session->kernel_session->channel_count;
5461b305 2129 }
ca95a216 2130
9f19cc17
DG
2131 ret = setup_lttng_msg(cmd_ctx,
2132 sizeof(struct lttng_channel) * nb_chan);
5461b305
DG
2133 if (ret < 0) {
2134 goto setup_error;
2135 }
9f19cc17
DG
2136
2137 list_lttng_channels(cmd_ctx->session,
2138 (struct lttng_channel *)(cmd_ctx->llm->payload));
2139
2140 ret = LTTCOMM_OK;
5461b305 2141 break;
5e16da05 2142 }
9f19cc17 2143 case LTTNG_LIST_EVENTS:
5e16da05 2144 {
9f19cc17
DG
2145 /*
2146 * TODO: Only kernel events are listed here. UST listing
2147 * is needed on lttng-ust 2.0 release.
2148 */
2149 size_t nb_event = 0;
2150 struct ltt_kernel_channel *kchan = NULL;
2151
2152 if (cmd_ctx->session->kernel_session != NULL) {
2153 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name,
2154 cmd_ctx->session->kernel_session);
2155 if (kchan == NULL) {
2156 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2157 goto error;
2158 }
2159 nb_event += kchan->event_count;
5461b305 2160 }
ca95a216 2161
9f19cc17
DG
2162 ret = setup_lttng_msg(cmd_ctx,
2163 sizeof(struct lttng_event) * nb_event);
5461b305
DG
2164 if (ret < 0) {
2165 goto setup_error;
2166 }
9f19cc17 2167
ced2f820 2168 DBG("Listing events (%zu events)", nb_event);
9f19cc17
DG
2169
2170 list_lttng_events(kchan,
2171 (struct lttng_event *)(cmd_ctx->llm->payload));
2172
2173 ret = LTTCOMM_OK;
5461b305 2174 break;
5e16da05
MD
2175 }
2176 case LTTNG_LIST_SESSIONS:
2177 {
6c9cc2ab 2178 lock_session_list();
5461b305 2179
6c9cc2ab 2180 if (session_list_ptr->count == 0) {
f3ed775e 2181 ret = LTTCOMM_NO_SESSION;
36a83748 2182 unlock_session_list();
5461b305 2183 goto error;
57167058 2184 }
5e16da05 2185
6c9cc2ab
DG
2186 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2187 session_list_ptr->count);
5461b305 2188 if (ret < 0) {
36a83748 2189 unlock_session_list();
5461b305 2190 goto setup_error;
e065084a 2191 }
5e16da05 2192
6c9cc2ab
DG
2193 /* Filled the session array */
2194 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2195
2196 unlock_session_list();
5e16da05 2197
5461b305 2198 ret = LTTCOMM_OK;
5e16da05
MD
2199 break;
2200 }
d0254c7c
MD
2201 case LTTNG_CALIBRATE:
2202 {
2203 /* Setup lttng message with no payload */
2204 ret = setup_lttng_msg(cmd_ctx, 0);
2205 if (ret < 0) {
2206 goto setup_error;
2207 }
2208
2209 switch (cmd_ctx->lsm->domain.type) {
2210 case LTTNG_DOMAIN_KERNEL:
2211 {
2212 struct lttng_kernel_calibrate kcalibrate;
2213
2214 kcalibrate.type = cmd_ctx->lsm->u.calibrate.type;
2215 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2216 if (ret < 0) {
2217 ret = LTTCOMM_KERN_ENABLE_FAIL;
2218 goto error;
2219 }
2220 break;
2221 }
2222 default:
2223 /* TODO: Userspace tracing */
2224 ret = LTTCOMM_NOT_IMPLEMENTED;
2225 goto error;
2226 }
2227 ret = LTTCOMM_OK;
2228 break;
2229 }
d9800920
DG
2230 case LTTNG_REGISTER_CONSUMER:
2231 {
2232 int sock;
2233
2234 /* Setup lttng message with no payload */
2235 ret = setup_lttng_msg(cmd_ctx, 0);
2236 if (ret < 0) {
2237 goto setup_error;
2238 }
2239
2240 switch (cmd_ctx->lsm->domain.type) {
2241 case LTTNG_DOMAIN_KERNEL:
2242 {
2243 /* Can't register a consumer if there is already one */
2244 if (cmd_ctx->session->kernel_session->consumer_fd != 0) {
2245 ret = LTTCOMM_CONNECT_FAIL;
2246 goto error;
2247 }
2248
2249 sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path);
2250 if (sock < 0) {
2251 ret = LTTCOMM_CONNECT_FAIL;
2252 goto error;
2253 }
2254
2255 cmd_ctx->session->kernel_session->consumer_fd = sock;
2256 break;
2257 }
2258 default:
2259 /* TODO: Userspace tracing */
2260 ret = LTTCOMM_NOT_IMPLEMENTED;
2261 goto error;
2262 }
2263
2264 ret = LTTCOMM_OK;
2265 break;
2266 }
d0254c7c 2267
5e16da05
MD
2268 default:
2269 /* Undefined command */
5461b305
DG
2270 ret = setup_lttng_msg(cmd_ctx, 0);
2271 if (ret < 0) {
2272 goto setup_error;
2273 }
2274
5e16da05 2275 ret = LTTCOMM_UND;
5461b305 2276 break;
fac6795d
DG
2277 }
2278
5461b305
DG
2279 /* Set return code */
2280 cmd_ctx->llm->ret_code = ret;
ca95a216 2281
b5541356
DG
2282 if (cmd_ctx->session) {
2283 unlock_session(cmd_ctx->session);
2284 }
2285
e065084a
DG
2286 return ret;
2287
5461b305 2288error:
5461b305
DG
2289 if (cmd_ctx->llm == NULL) {
2290 DBG("Missing llm structure. Allocating one.");
894be886 2291 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2292 goto setup_error;
2293 }
2294 }
e065084a 2295 /* Notify client of error */
5461b305 2296 cmd_ctx->llm->ret_code = ret;
e065084a 2297
5461b305 2298setup_error:
b5541356
DG
2299 if (cmd_ctx->session) {
2300 unlock_session(cmd_ctx->session);
2301 }
8028d920 2302 return ret;
fac6795d
DG
2303}
2304
1d4b027a 2305/*
d063d709
DG
2306 * This thread manage all clients request using the unix client socket for
2307 * communication.
1d4b027a
DG
2308 */
2309static void *thread_manage_clients(void *data)
2310{
273ea72c
DG
2311 int sock = 0, ret;
2312 struct command_ctx *cmd_ctx = NULL;
2313 struct pollfd pollfd[2];
1d4b027a
DG
2314
2315 DBG("[thread] Manage client started");
2316
2317 ret = lttcomm_listen_unix_sock(client_sock);
2318 if (ret < 0) {
2319 goto error;
2320 }
2321
273ea72c
DG
2322 /* First fd is always the quit pipe */
2323 pollfd[0].fd = thread_quit_pipe[0];
2324
2325 /* Apps socket */
2326 pollfd[1].fd = client_sock;
2327 pollfd[1].events = POLLIN;
2328
1d4b027a
DG
2329 /* Notify parent pid that we are ready
2330 * to accept command for client side.
2331 */
2332 if (opt_sig_parent) {
2333 kill(ppid, SIGCHLD);
2334 }
2335
2336 while (1) {
1d4b027a 2337 DBG("Accepting client command ...");
273ea72c
DG
2338
2339 /* Inifinite blocking call, waiting for transmission */
2340 ret = poll(pollfd, 2, -1);
2341 if (ret < 0) {
2342 perror("poll client thread");
2343 goto error;
2344 }
2345
2346 /* Thread quit pipe has been closed. Killing thread. */
2347 if (pollfd[0].revents == POLLNVAL) {
2348 goto error;
2349 } else if (pollfd[1].revents == POLLERR) {
2350 ERR("Client socket poll error");
2351 goto error;
2352 }
2353
1d4b027a
DG
2354 sock = lttcomm_accept_unix_sock(client_sock);
2355 if (sock < 0) {
2356 goto error;
2357 }
2358
2359 /* Allocate context command to process the client request */
2360 cmd_ctx = malloc(sizeof(struct command_ctx));
2361
2362 /* Allocate data buffer for reception */
2363 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2364 cmd_ctx->llm = NULL;
2365 cmd_ctx->session = NULL;
2366
2367 /*
2368 * Data is received from the lttng client. The struct
2369 * lttcomm_session_msg (lsm) contains the command and data request of
2370 * the client.
2371 */
2372 DBG("Receiving data from client ...");
2373 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
2374 if (ret <= 0) {
2375 continue;
2376 }
2377
f7776ea7
DG
2378 // TODO: Validate cmd_ctx including sanity check for security purpose.
2379
1d4b027a
DG
2380 /*
2381 * This function dispatch the work to the kernel or userspace tracer
2382 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2383 * informations for the client. The command context struct contains
2384 * everything this function may needs.
2385 */
2386 ret = process_client_msg(cmd_ctx);
2387 if (ret < 0) {
2388 /* TODO: Inform client somehow of the fatal error. At this point,
2389 * ret < 0 means that a malloc failed (ENOMEM). */
2390 /* Error detected but still accept command */
a2fb29a5 2391 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2392 continue;
2393 }
2394
2395 DBG("Sending response (size: %d, retcode: %d)",
2396 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
2397 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
2398 if (ret < 0) {
2399 ERR("Failed to send data back to client");
2400 }
2401
a2fb29a5 2402 clean_command_ctx(&cmd_ctx);
d6e4fca4
DG
2403
2404 /* End of transmission */
2405 close(sock);
1d4b027a
DG
2406 }
2407
2408error:
273ea72c
DG
2409 DBG("Client thread dying");
2410 if (client_sock) {
2411 close(client_sock);
2412 }
2413 if (sock) {
2414 close(sock);
2415 }
2416
2417 unlink(client_unix_sock_path);
2418
a2fb29a5 2419 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2420 return NULL;
2421}
2422
2423
fac6795d
DG
2424/*
2425 * usage function on stderr
2426 */
2427static void usage(void)
2428{
b716ce68 2429 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
2430 fprintf(stderr, " -h, --help Display this usage.\n");
2431 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
2432 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2433 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2434 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2435 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
2436 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2437 fprintf(stderr, " -V, --version Show version number.\n");
2438 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2439 fprintf(stderr, " -q, --quiet No output at all.\n");
2440 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 2441 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
2442}
2443
2444/*
2445 * daemon argument parsing
2446 */
2447static int parse_args(int argc, char **argv)
2448{
2449 int c;
2450
2451 static struct option long_options[] = {
2452 { "client-sock", 1, 0, 'c' },
2453 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
2454 { "kconsumerd-cmd-sock", 1, 0, 0 },
2455 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 2456 { "daemonize", 0, 0, 'd' },
5b8719f5 2457 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
2458 { "help", 0, 0, 'h' },
2459 { "group", 1, 0, 'g' },
2460 { "version", 0, 0, 'V' },
75462a81 2461 { "quiet", 0, 0, 'q' },
3f9947db 2462 { "verbose", 0, 0, 'v' },
31f73cc9 2463 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
2464 { NULL, 0, 0, 0 }
2465 };
2466
2467 while (1) {
2468 int option_index = 0;
31f73cc9 2469 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index);
fac6795d
DG
2470 if (c == -1) {
2471 break;
2472 }
2473
2474 switch (c) {
2475 case 0:
2476 fprintf(stderr, "option %s", long_options[option_index].name);
2477 if (optarg) {
2478 fprintf(stderr, " with arg %s\n", optarg);
2479 }
2480 break;
b716ce68 2481 case 'c':
fac6795d
DG
2482 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
2483 break;
2484 case 'a':
2485 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
2486 break;
2487 case 'd':
2488 opt_daemon = 1;
2489 break;
2490 case 'g':
2491 opt_tracing_group = strdup(optarg);
2492 break;
2493 case 'h':
2494 usage();
2495 exit(EXIT_FAILURE);
2496 case 'V':
2497 fprintf(stdout, "%s\n", VERSION);
2498 exit(EXIT_SUCCESS);
5b8719f5
DG
2499 case 'S':
2500 opt_sig_parent = 1;
2501 break;
d6f42150
DG
2502 case 'E':
2503 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
2504 break;
2505 case 'C':
2506 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
2507 break;
75462a81
DG
2508 case 'q':
2509 opt_quiet = 1;
2510 break;
3f9947db 2511 case 'v':
53086306
DG
2512 /* Verbose level can increase using multiple -v */
2513 opt_verbose += 1;
3f9947db 2514 break;
31f73cc9
MD
2515 case 'Z':
2516 opt_verbose_kconsumerd += 1;
2517 break;
fac6795d
DG
2518 default:
2519 /* Unknown option or other error.
2520 * Error is printed by getopt, just return */
2521 return -1;
2522 }
2523 }
2524
2525 return 0;
2526}
2527
2528/*
d063d709 2529 * Creates the two needed socket by the daemon.
d6f42150
DG
2530 * apps_sock - The communication socket for all UST apps.
2531 * client_sock - The communication of the cli tool (lttng).
fac6795d 2532 */
cf3af59e 2533static int init_daemon_socket(void)
fac6795d
DG
2534{
2535 int ret = 0;
2536 mode_t old_umask;
2537
2538 old_umask = umask(0);
2539
2540 /* Create client tool unix socket */
d6f42150
DG
2541 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
2542 if (client_sock < 0) {
2543 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
2544 ret = -1;
2545 goto end;
2546 }
2547
2548 /* File permission MUST be 660 */
2549 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2550 if (ret < 0) {
d6f42150 2551 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
2552 perror("chmod");
2553 goto end;
2554 }
2555
2556 /* Create the application unix socket */
d6f42150
DG
2557 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
2558 if (apps_sock < 0) {
2559 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
2560 ret = -1;
2561 goto end;
2562 }
2563
d6f42150 2564 /* File permission MUST be 666 */
fac6795d
DG
2565 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
2566 if (ret < 0) {
d6f42150 2567 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
2568 perror("chmod");
2569 goto end;
2570 }
2571
2572end:
2573 umask(old_umask);
2574 return ret;
2575}
2576
2577/*
7d8234d9
MD
2578 * Check if the global socket is available, and if a daemon is answering
2579 * at the other side. If yes, error is returned.
fac6795d 2580 */
cf3af59e 2581static int check_existing_daemon(void)
fac6795d 2582{
7d8234d9
MD
2583 if (access(client_unix_sock_path, F_OK) < 0 &&
2584 access(apps_unix_sock_path, F_OK) < 0)
2585 return 0;
2586 /* Is there anybody out there ? */
2587 if (lttng_session_daemon_alive())
2588 return -EEXIST;
2589 else
2590 return 0;
fac6795d
DG
2591}
2592
fac6795d 2593/*
d063d709 2594 * Set the tracing group gid onto the client socket.
5e16da05 2595 *
d063d709
DG
2596 * Race window between mkdir and chown is OK because we are going from more
2597 * permissive (root.root) to les permissive (root.tracing).
fac6795d 2598 */
d6f42150 2599static int set_permissions(void)
fac6795d
DG
2600{
2601 int ret;
996b65c8 2602 gid_t gid;
fac6795d 2603
996b65c8
MD
2604 gid = allowed_group();
2605 if (gid < 0) {
a463f419
DG
2606 if (is_root) {
2607 WARN("No tracing group detected");
2608 ret = 0;
2609 } else {
2610 ERR("Missing tracing group. Aborting execution.");
2611 ret = -1;
2612 }
fac6795d
DG
2613 goto end;
2614 }
2615
d6f42150 2616 /* Set lttng run dir */
996b65c8 2617 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
2618 if (ret < 0) {
2619 ERR("Unable to set group on " LTTNG_RUNDIR);
2620 perror("chown");
2621 }
2622
2623 /* lttng client socket path */
996b65c8 2624 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 2625 if (ret < 0) {
d6f42150
DG
2626 ERR("Unable to set group on %s", client_unix_sock_path);
2627 perror("chown");
2628 }
2629
2630 /* kconsumerd error socket path */
996b65c8 2631 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
2632 if (ret < 0) {
2633 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
2634 perror("chown");
2635 }
2636
d6f42150 2637 DBG("All permissions are set");
e07ae692 2638
fac6795d
DG
2639end:
2640 return ret;
2641}
2642
7a485870 2643/*
d063d709 2644 * Create the pipe used to wake up the kernel thread.
7a485870
DG
2645 */
2646static int create_kernel_poll_pipe(void)
2647{
2648 return pipe2(kernel_poll_pipe, O_CLOEXEC);
2649}
2650
d6f42150 2651/*
d063d709 2652 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
2653 */
2654static int create_lttng_rundir(void)
2655{
2656 int ret;
2657
2658 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
2659 if (ret < 0) {
b1f11e69
DG
2660 if (errno != EEXIST) {
2661 ERR("Unable to create " LTTNG_RUNDIR);
2662 goto error;
2663 } else {
2664 ret = 0;
2665 }
d6f42150
DG
2666 }
2667
2668error:
2669 return ret;
2670}
2671
2672/*
d063d709
DG
2673 * Setup sockets and directory needed by the kconsumerd communication with the
2674 * session daemon.
d6f42150
DG
2675 */
2676static int set_kconsumerd_sockets(void)
2677{
2678 int ret;
2679
2680 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
2681 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
2682 }
2683
2684 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
2685 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
2686 }
2687
2688 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
2689 if (ret < 0) {
6beb2242
DG
2690 if (errno != EEXIST) {
2691 ERR("Failed to create " KCONSUMERD_PATH);
2692 goto error;
2693 }
2694 ret = 0;
d6f42150
DG
2695 }
2696
2697 /* Create the kconsumerd error unix socket */
2698 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
2699 if (kconsumerd_err_sock < 0) {
2700 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
2701 ret = -1;
2702 goto error;
2703 }
2704
2705 /* File permission MUST be 660 */
2706 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2707 if (ret < 0) {
2708 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
2709 perror("chmod");
2710 goto error;
2711 }
2712
2713error:
2714 return ret;
2715}
2716
fac6795d 2717/*
d063d709 2718 * Signal handler for the daemon
cf3af59e
MD
2719 *
2720 * Simply stop all worker threads, leaving main() return gracefully
2721 * after joining all threads and calling cleanup().
fac6795d
DG
2722 */
2723static void sighandler(int sig)
2724{
2725 switch (sig) {
cf3af59e
MD
2726 case SIGPIPE:
2727 DBG("SIGPIPE catched");
2728 return;
2729 case SIGINT:
2730 DBG("SIGINT catched");
2731 stop_threads();
2732 break;
2733 case SIGTERM:
2734 DBG("SIGTERM catched");
2735 stop_threads();
2736 break;
2737 default:
2738 break;
fac6795d 2739 }
fac6795d
DG
2740}
2741
2742/*
d063d709 2743 * Setup signal handler for :
1d4b027a 2744 * SIGINT, SIGTERM, SIGPIPE
fac6795d 2745 */
1d4b027a 2746static int set_signal_handler(void)
fac6795d 2747{
1d4b027a
DG
2748 int ret = 0;
2749 struct sigaction sa;
2750 sigset_t sigset;
fac6795d 2751
1d4b027a
DG
2752 if ((ret = sigemptyset(&sigset)) < 0) {
2753 perror("sigemptyset");
2754 return ret;
2755 }
d6f42150 2756
1d4b027a
DG
2757 sa.sa_handler = sighandler;
2758 sa.sa_mask = sigset;
2759 sa.sa_flags = 0;
2760 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
2761 perror("sigaction");
2762 return ret;
d6f42150
DG
2763 }
2764
1d4b027a
DG
2765 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
2766 perror("sigaction");
2767 return ret;
d6f42150 2768 }
aaf26714 2769
1d4b027a
DG
2770 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
2771 perror("sigaction");
2772 return ret;
8c0faa1d
DG
2773 }
2774
1d4b027a
DG
2775 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2776
2777 return ret;
fac6795d
DG
2778}
2779
f3ed775e 2780/*
d063d709
DG
2781 * Set open files limit to unlimited. This daemon can open a large number of
2782 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
2783 */
2784static void set_ulimit(void)
2785{
2786 int ret;
2787 struct rlimit lim;
2788
a88df331 2789 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
2790 lim.rlim_cur = 65535;
2791 lim.rlim_max = 65535;
2792
2793 ret = setrlimit(RLIMIT_NOFILE, &lim);
2794 if (ret < 0) {
2795 perror("failed to set open files limit");
2796 }
2797}
2798
fac6795d
DG
2799/*
2800 * main
2801 */
2802int main(int argc, char **argv)
2803{
fac6795d
DG
2804 int ret = 0;
2805 void *status;
b082db07 2806 const char *home_path;
fac6795d 2807
273ea72c 2808 /* Create thread quit pipe */
cf3af59e
MD
2809 if ((ret = init_thread_quit_pipe()) < 0) {
2810 goto error;
273ea72c
DG
2811 }
2812
fac6795d
DG
2813 /* Parse arguments */
2814 progname = argv[0];
2815 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 2816 goto error;
fac6795d
DG
2817 }
2818
2819 /* Daemonize */
2820 if (opt_daemon) {
53094c05
DG
2821 ret = daemon(0, 0);
2822 if (ret < 0) {
2823 perror("daemon");
cf3af59e 2824 goto error;
53094c05 2825 }
fac6795d
DG
2826 }
2827
2828 /* Check if daemon is UID = 0 */
2829 is_root = !getuid();
2830
fac6795d 2831 if (is_root) {
d6f42150
DG
2832 ret = create_lttng_rundir();
2833 if (ret < 0) {
cf3af59e 2834 goto error;
d6f42150
DG
2835 }
2836
fac6795d 2837 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2838 snprintf(apps_unix_sock_path, PATH_MAX,
2839 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
2840 }
2841
2842 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2843 snprintf(client_unix_sock_path, PATH_MAX,
2844 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
2845 }
fac6795d 2846 } else {
b082db07
DG
2847 home_path = get_home_dir();
2848 if (home_path == NULL) {
273ea72c
DG
2849 /* TODO: Add --socket PATH option */
2850 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
2851 ret = -EPERM;
2852 goto error;
b082db07
DG
2853 }
2854
fac6795d 2855 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 2856 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 2857 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
2858 }
2859
2860 /* Set the cli tool unix socket path */
2861 if (strlen(client_unix_sock_path) == 0) {
d6f42150 2862 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 2863 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d
DG
2864 }
2865 }
2866
847177cd
DG
2867 DBG("Client socket path %s", client_unix_sock_path);
2868 DBG("Application socket path %s", apps_unix_sock_path);
2869
273ea72c 2870 /*
7d8234d9 2871 * See if daemon already exist.
fac6795d 2872 */
7d8234d9 2873 if ((ret = check_existing_daemon()) < 0) {
75462a81 2874 ERR("Already running daemon.\n");
273ea72c 2875 /*
cf3af59e
MD
2876 * We do not goto exit because we must not cleanup()
2877 * because a daemon is already running.
ab118b20 2878 */
cf3af59e 2879 goto error;
a88df331
DG
2880 }
2881
2882 /* After this point, we can safely call cleanup() so goto error is used */
2883
2884 /*
2885 * These actions must be executed as root. We do that *after* setting up
2886 * the sockets path because we MUST make the check for another daemon using
2887 * those paths *before* trying to set the kernel consumer sockets and init
2888 * kernel tracer.
2889 */
2890 if (is_root) {
2891 ret = set_kconsumerd_sockets();
2892 if (ret < 0) {
cf3af59e 2893 goto exit;
a88df331
DG
2894 }
2895
2896 /* Setup kernel tracer */
2897 init_kernel_tracer();
2898
2899 /* Set ulimit for open files */
2900 set_ulimit();
fac6795d
DG
2901 }
2902
cf3af59e
MD
2903 if ((ret = set_signal_handler()) < 0) {
2904 goto exit;
fac6795d
DG
2905 }
2906
d6f42150 2907 /* Setup the needed unix socket */
cf3af59e
MD
2908 if ((ret = init_daemon_socket()) < 0) {
2909 goto exit;
fac6795d
DG
2910 }
2911
2912 /* Set credentials to socket */
cf3af59e
MD
2913 if (is_root && ((ret = set_permissions()) < 0)) {
2914 goto exit;
fac6795d
DG
2915 }
2916
5b8719f5
DG
2917 /* Get parent pid if -S, --sig-parent is specified. */
2918 if (opt_sig_parent) {
2919 ppid = getppid();
2920 }
2921
7a485870 2922 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD
2923 if ((ret = create_kernel_poll_pipe()) < 0) {
2924 goto exit;
7a485870
DG
2925 }
2926
273ea72c
DG
2927 /*
2928 * Get session list pointer. This pointer MUST NOT be free().
2929 * This list is statically declared in session.c
2930 */
b5541356
DG
2931 session_list_ptr = get_session_list();
2932
cf3af59e
MD
2933 /* Create thread to manage the client socket */
2934 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
2935 if (ret != 0) {
2936 perror("pthread_create");
2937 goto exit_client;
2938 }
fac6795d 2939
cf3af59e
MD
2940 /* Create thread to manage application socket */
2941 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
2942 if (ret != 0) {
2943 perror("pthread_create");
2944 goto exit_apps;
2945 }
fac6795d 2946
cf3af59e
MD
2947 /* Create kernel thread to manage kernel event */
2948 ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL);
2949 if (ret != 0) {
2950 perror("pthread_create");
2951 goto exit_kernel;
2952 }
7a485870 2953
cf3af59e
MD
2954 ret = pthread_join(kernel_thread, &status);
2955 if (ret != 0) {
2956 perror("pthread_join");
2957 goto error; /* join error, exit without cleanup */
fac6795d
DG
2958 }
2959
cf3af59e
MD
2960exit_kernel:
2961 ret = pthread_join(apps_thread, &status);
2962 if (ret != 0) {
2963 perror("pthread_join");
2964 goto error; /* join error, exit without cleanup */
2965 }
fac6795d 2966
cf3af59e
MD
2967exit_apps:
2968 ret = pthread_join(client_thread, &status);
2969 if (ret != 0) {
2970 perror("pthread_join");
2971 goto error; /* join error, exit without cleanup */
2972 }
2973
2974 ret = join_kconsumerd_thread();
2975 if (ret != 0) {
2976 perror("join_kconsumerd");
2977 goto error; /* join error, exit without cleanup */
2978 }
a88df331 2979
cf3af59e 2980exit_client:
a88df331 2981exit:
cf3af59e
MD
2982 /*
2983 * cleanup() is called when no other thread is running.
2984 */
2985 cleanup();
2986 if (!ret)
2987 exit(EXIT_SUCCESS);
2988error:
5e16da05 2989 exit(EXIT_FAILURE);
fac6795d 2990}
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