Remove useless kernel session counter
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
fac6795d
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3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
91d76f53 8 *
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9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
91d76f53 13 *
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14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
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26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/ipc.h>
b73401da 31#include <sys/mount.h>
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32#include <sys/shm.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
f3ed775e
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36#include <sys/time.h>
37#include <sys/resource.h>
fac6795d
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38#include <unistd.h>
39
40#include <urcu/list.h> /* URCU list library (-lurcu) */
5b97ec60 41#include <lttng/lttng.h>
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42
43#include "liblttsessiondcomm.h"
44#include "ltt-sessiond.h"
75462a81 45#include "lttngerr.h"
20fe2104 46#include "kernel-ctl.h"
9e78d6ae 47#include "ust-ctl.h"
5b74c7b1 48#include "session.h"
91d76f53 49#include "traceable-app.h"
5dc18550 50#include "lttng-kconsumerd.h"
62d3069f 51#include "libustctl.h"
8e68d1c8 52#include "utils.h"
fac6795d 53
5e16da05
MD
54/*
55 * TODO:
56 * teardown: signal SIGTERM handler -> write into pipe. Threads waits
57 * with epoll on pipe and on other pipes/sockets for commands. Main
58 * simply waits on pthread join.
59 */
60
75462a81 61/* Const values */
686204ab 62const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 63const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
64const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
65const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
66
fac6795d 67/* Variables */
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68int opt_verbose; /* Not static for lttngerr.h */
69int opt_quiet; /* Not static for lttngerr.h */
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70const char *progname;
71const char *opt_tracing_group;
5b8719f5 72static int opt_sig_parent;
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73static int opt_daemon;
74static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
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75static pid_t ppid; /* Parent PID for --sig-parent option */
76static pid_t kconsumerd_pid;
fac6795d 77
d6f42150
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78static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
79static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
80static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
81static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
fac6795d 82
1d4b027a 83/* Sockets and FDs */
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84static int client_sock;
85static int apps_sock;
86static int kconsumerd_err_sock;
8c0faa1d 87static int kconsumerd_cmd_sock;
20fe2104 88static int kernel_tracer_fd;
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89
90/* Pthread, Mutexes and Semaphores */
8c0faa1d 91static pthread_t kconsumerd_thread;
1d4b027a
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92static pthread_t apps_thread;
93static pthread_t client_thread;
8c0faa1d
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94static sem_t kconsumerd_sem;
95
1d4b027a 96static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 97
fac6795d 98/*
1d4b027a 99 * teardown_kernel_session
fac6795d 100 *
1d4b027a
DG
101 * Complete teardown of a kernel session. This free all data structure
102 * related to a kernel session and update counter.
fac6795d 103 */
1d4b027a 104static void teardown_kernel_session(struct ltt_session *session)
fac6795d 105{
1d4b027a
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106 if (session->kernel_session != NULL) {
107 DBG("Tearing down kernel session");
c363b55d 108 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
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109 /* Extra precaution */
110 session->kernel_session = NULL;
fac6795d 111 }
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112}
113
114/*
1d4b027a 115 * cleanup
fac6795d 116 *
1d4b027a 117 * Cleanup the daemon on exit
fac6795d 118 */
1d4b027a 119static void cleanup()
fac6795d 120{
1d4b027a
DG
121 int ret;
122 char *cmd;
123 struct ltt_session *sess;
fac6795d 124
1d4b027a 125 DBG("Cleaning up");
e07ae692 126
1d4b027a
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127 /* <fun> */
128 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
129 MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
130 /* </fun> */
fac6795d 131
1d4b027a
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132 /* Stopping all threads */
133 DBG("Terminating all threads");
134 pthread_cancel(client_thread);
135 pthread_cancel(apps_thread);
136 if (kconsumerd_pid != 0) {
137 pthread_cancel(kconsumerd_thread);
5b8719f5
DG
138 }
139
1d4b027a
DG
140 DBG("Unlinking all unix socket");
141 unlink(client_unix_sock_path);
142 unlink(apps_unix_sock_path);
143 unlink(kconsumerd_err_unix_sock_path);
fac6795d 144
1d4b027a
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145 DBG("Removing %s directory", LTTNG_RUNDIR);
146 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
147 if (ret < 0) {
148 ERR("asprintf failed. Something is really wrong!");
149 }
5461b305 150
1d4b027a
DG
151 /* Remove lttng run directory */
152 ret = system(cmd);
153 if (ret < 0) {
154 ERR("Unable to clean " LTTNG_RUNDIR);
155 }
5461b305 156
1d4b027a
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157 DBG("Cleaning up all session");
158 /* Cleanup ALL session */
159 cds_list_for_each_entry(sess, &ltt_session_list.head, list) {
160 teardown_kernel_session(sess);
161 // TODO complete session cleanup (including UST)
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162 }
163
f3ed775e 164 DBG("Closing kernel fd");
1d4b027a 165 close(kernel_tracer_fd);
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166}
167
e065084a
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168/*
169 * send_unix_sock
170 *
171 * Send data on a unix socket using the liblttsessiondcomm API.
172 *
173 * Return lttcomm error code.
174 */
175static int send_unix_sock(int sock, void *buf, size_t len)
176{
177 /* Check valid length */
178 if (len <= 0) {
179 return -1;
180 }
181
182 return lttcomm_send_unix_sock(sock, buf, len);
183}
184
5461b305
DG
185/*
186 * clean_command_ctx
187 *
188 * Free memory of a command context structure.
189 */
190static void clean_command_ctx(struct command_ctx *cmd_ctx)
191{
192 DBG("Clean command context structure %p", cmd_ctx);
193 if (cmd_ctx) {
194 if (cmd_ctx->llm) {
195 free(cmd_ctx->llm);
196 }
197 if (cmd_ctx->lsm) {
198 free(cmd_ctx->lsm);
199 }
200 free(cmd_ctx);
201 cmd_ctx = NULL;
202 }
203}
204
f3ed775e
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205/*
206 * send_kconsumerd_fds
207 *
208 * Send all stream fds of the kernel session to the consumer.
209 */
210static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
211{
212 int ret;
213 size_t nb_fd;
214 struct ltt_kernel_stream *stream;
215 struct ltt_kernel_channel *chan;
216 struct lttcomm_kconsumerd_header lkh;
217 struct lttcomm_kconsumerd_msg lkm;
218
219 nb_fd = session->stream_count_global;
220
221 /* Setup header */
222 lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
223 lkh.cmd_type = ADD_STREAM;
224
225 DBG("Sending kconsumerd header");
226
227 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
228 if (ret < 0) {
229 perror("send kconsumerd header");
230 goto error;
231 }
232
233 DBG("Sending metadata stream fd");
234
235 /* Send metadata stream fd first */
236 lkm.fd = session->metadata_stream_fd;
237 lkm.state = ACTIVE_FD;
238 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
239 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
240
241 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
242 if (ret < 0) {
243 perror("send kconsumerd fd");
244 goto error;
245 }
246
247 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
248 cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
249 lkm.fd = stream->fd;
250 lkm.state = stream->state;
251 lkm.max_sb_size = chan->channel->attr.subbuf_size;
252 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
253
254 DBG("Sending fd %d to kconsumerd", lkm.fd);
255
256 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
257 if (ret < 0) {
258 perror("send kconsumerd fd");
259 goto error;
260 }
261 }
262 }
263
264 DBG("Kconsumerd fds sent");
265
266 return 0;
267
268error:
269 return ret;
270}
271
272/*
273 * create_trace_dir
274 *
275 * Create the trace output directory.
276 */
277static int create_trace_dir(struct ltt_kernel_session *session)
278{
279 int ret;
280 struct ltt_kernel_channel *chan;
281
282 /* Create all channel directories */
283 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
284 DBG("Creating trace directory at %s", chan->pathname);
8e68d1c8 285 ret = mkdir_recursive(chan->pathname, S_IRWXU | S_IRWXG );
f3ed775e
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286 if (ret < 0) {
287 if (ret != EEXIST) {
8e68d1c8 288 ERR("Trace directory creation error");
f3ed775e
DG
289 goto error;
290 }
291 }
292 }
293
294 return 0;
295
296error:
297 return ret;
298}
299
fac6795d 300/*
471d1693 301 * ust_connect_app
fac6795d
DG
302 *
303 * Return a socket connected to the libust communication socket
304 * of the application identified by the pid.
379473d2
DG
305 *
306 * If the pid is not found in the traceable list,
307 * return -1 to indicate error.
fac6795d 308 */
471d1693 309static int ust_connect_app(pid_t pid)
fac6795d 310{
91d76f53
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311 int sock;
312 struct ltt_traceable_app *lta;
379473d2 313
e07ae692
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314 DBG("Connect to application pid %d", pid);
315
91d76f53
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316 lta = find_app_by_pid(pid);
317 if (lta == NULL) {
318 /* App not found */
7442b2ba 319 DBG("Application pid %d not found", pid);
379473d2
DG
320 return -1;
321 }
fac6795d 322
91d76f53 323 sock = ustctl_connect_pid(lta->pid);
fac6795d 324 if (sock < 0) {
62d3069f 325 ERR("Fail connecting to the PID %d", pid);
fac6795d
DG
326 }
327
328 return sock;
329}
330
331/*
332 * notify_apps
333 *
334 * Notify apps by writing 42 to a named pipe using name.
335 * Every applications waiting for a ltt-sessiond will be notified
336 * and re-register automatically to the session daemon.
337 *
338 * Return open or write error value.
339 */
340static int notify_apps(const char *name)
341{
342 int fd;
343 int ret = -1;
344
e07ae692
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345 DBG("Notify the global application pipe");
346
fac6795d
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347 /* Try opening the global pipe */
348 fd = open(name, O_WRONLY);
349 if (fd < 0) {
350 goto error;
351 }
352
353 /* Notify by writing on the pipe */
354 ret = write(fd, "42", 2);
355 if (ret < 0) {
356 perror("write");
357 }
358
359error:
360 return ret;
361}
362
e065084a 363/*
5461b305 364 * setup_lttng_msg
ca95a216 365 *
5461b305
DG
366 * Setup the outgoing data buffer for the response (llm) by allocating the
367 * right amount of memory and copying the original information from the lsm
368 * structure.
ca95a216
DG
369 *
370 * Return total size of the buffer pointed by buf.
371 */
5461b305 372static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 373{
f3ed775e 374 int ret, buf_size;
ca95a216 375
f3ed775e 376 buf_size = size;
5461b305
DG
377
378 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
379 if (cmd_ctx->llm == NULL) {
ca95a216 380 perror("malloc");
5461b305 381 ret = -ENOMEM;
ca95a216
DG
382 goto error;
383 }
384
5461b305
DG
385 /* Copy common data */
386 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
387 cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
5461b305 388
5461b305
DG
389 cmd_ctx->llm->data_size = size;
390 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
391
ca95a216
DG
392 return buf_size;
393
394error:
395 return ret;
396}
397
1d4b027a
DG
398/*
399 * thread_manage_kconsumerd
400 *
401 * This thread manage the kconsumerd error sent
402 * back to the session daemon.
403 */
404static void *thread_manage_kconsumerd(void *data)
405{
406 int sock, ret;
407 enum lttcomm_return_code code;
408
409 DBG("[thread] Manage kconsumerd started");
410
411 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
412 if (ret < 0) {
413 goto error;
414 }
415
416 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
417 if (sock < 0) {
418 goto error;
419 }
420
712ea556 421 /* Getting status code from kconsumerd */
1d4b027a
DG
422 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
423 if (ret <= 0) {
424 goto error;
425 }
426
427 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
428 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
429 if (kconsumerd_cmd_sock < 0) {
712ea556 430 sem_post(&kconsumerd_sem);
1d4b027a
DG
431 perror("kconsumerd connect");
432 goto error;
433 }
434 /* Signal condition to tell that the kconsumerd is ready */
435 sem_post(&kconsumerd_sem);
436 DBG("Kconsumerd command socket ready");
437 } else {
6f61d021 438 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
439 lttcomm_get_readable_code(-code));
440 goto error;
441 }
442
712ea556
DG
443 /* Wait for any kconsumerd error */
444 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
445 if (ret <= 0) {
446 ERR("Kconsumerd closed the command socket");
447 goto error;
6f61d021 448 }
1d4b027a 449
712ea556
DG
450 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
451
1d4b027a
DG
452error:
453 kconsumerd_pid = 0;
6f61d021 454 DBG("Kconsumerd thread dying");
1d4b027a
DG
455 return NULL;
456}
457
458/*
459 * thread_manage_apps
460 *
461 * This thread manage the application socket communication
462 */
463static void *thread_manage_apps(void *data)
464{
465 int sock, ret;
466
467 /* TODO: Something more elegant is needed but fine for now */
468 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
469 * for 32-bit vs 64-bit compat processes. */
470 /* replicate in ust with version number */
471 struct {
472 int reg; /* 1:register, 0:unregister */
473 pid_t pid;
474 uid_t uid;
475 } reg_msg;
476
477 DBG("[thread] Manage apps started");
478
479 ret = lttcomm_listen_unix_sock(apps_sock);
480 if (ret < 0) {
481 goto error;
482 }
483
484 /* Notify all applications to register */
485 notify_apps(default_global_apps_pipe);
486
487 while (1) {
488 DBG("Accepting application registration");
489 /* Blocking call, waiting for transmission */
490 sock = lttcomm_accept_unix_sock(apps_sock);
491 if (sock < 0) {
492 goto error;
493 }
494
495 /* Basic recv here to handle the very simple data
496 * that the libust send to register (reg_msg).
497 */
498 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
499 if (ret < 0) {
500 perror("recv");
501 continue;
502 }
503
504 /* Add application to the global traceable list */
505 if (reg_msg.reg == 1) {
506 /* Registering */
507 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
508 if (ret < 0) {
509 /* register_traceable_app only return an error with
510 * ENOMEM. At this point, we better stop everything.
511 */
512 goto error;
513 }
514 } else {
515 /* Unregistering */
516 unregister_traceable_app(reg_msg.pid);
517 }
518 }
519
520error:
521
522 return NULL;
523}
524
8c0faa1d 525/*
693bd40b 526 * spawn_kconsumerd_thread
8c0faa1d
DG
527 *
528 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
529 * exec or it will fails.
530 */
693bd40b 531static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
532{
533 int ret;
534
535 /* Setup semaphore */
536 sem_init(&kconsumerd_sem, 0, 0);
537
1d4b027a 538 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
539 if (ret != 0) {
540 perror("pthread_create kconsumerd");
541 goto error;
542 }
543
693bd40b 544 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
545 sem_wait(&kconsumerd_sem);
546
712ea556
DG
547 if (kconsumerd_pid == 0) {
548 ERR("Kconsumerd did not start");
549 goto error;
550 }
551
8c0faa1d
DG
552 return 0;
553
554error:
712ea556 555 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
556 return ret;
557}
558
559/*
693bd40b 560 * spawn_kconsumerd
8c0faa1d 561 *
693bd40b
DG
562 * Fork and exec a kernel consumer daemon (kconsumerd).
563 *
564 * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
565 * file descriptor using the libkernelctl or kernel-ctl functions. So, a
566 * kernel consumer MUST only be spawned before creating a kernel session.
8c0faa1d
DG
567 *
568 * Return pid if successful else -1.
569 */
693bd40b 570static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
571{
572 int ret;
573 pid_t pid;
574
c49dc785
DG
575 DBG("Spawning kconsumerd");
576
8c0faa1d
DG
577 pid = fork();
578 if (pid == 0) {
579 /*
580 * Exec kconsumerd.
581 */
2b1173d8 582 execlp("ltt-kconsumerd", "ltt-kconsumerd", "--verbose", NULL);
8c0faa1d
DG
583 if (errno != 0) {
584 perror("kernel start consumer exec");
585 }
586 exit(EXIT_FAILURE);
587 } else if (pid > 0) {
588 ret = pid;
589 goto error;
590 } else {
591 perror("kernel start consumer fork");
592 ret = -errno;
593 goto error;
594 }
595
596error:
597 return ret;
598}
599
693bd40b
DG
600/*
601 * start_kconsumerd
602 *
603 * Spawn the kconsumerd daemon and session daemon thread.
604 */
605static int start_kconsumerd(void)
606{
607 int ret;
608
693bd40b 609 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785
DG
610 if (kconsumerd_pid != 0) {
611 goto end;
612 }
693bd40b 613
c49dc785
DG
614 ret = spawn_kconsumerd();
615 if (ret < 0) {
616 ERR("Spawning kconsumerd failed");
617 ret = LTTCOMM_KERN_CONSUMER_FAIL;
618 pthread_mutex_unlock(&kconsumerd_pid_mutex);
619 goto error;
693bd40b 620 }
c49dc785
DG
621
622 /* Setting up the global kconsumerd_pid */
623 kconsumerd_pid = ret;
693bd40b
DG
624 pthread_mutex_unlock(&kconsumerd_pid_mutex);
625
6f61d021
DG
626 DBG("Kconsumerd pid %d", ret);
627
693bd40b 628 DBG("Spawning kconsumerd thread");
693bd40b
DG
629 ret = spawn_kconsumerd_thread();
630 if (ret < 0) {
631 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
632 goto error;
633 }
634
c49dc785
DG
635end:
636 pthread_mutex_unlock(&kconsumerd_pid_mutex);
693bd40b
DG
637 return 0;
638
639error:
640 return ret;
641}
642
b73401da
DG
643/*
644 * modprobe_kernel_modules
645 */
646static int modprobe_kernel_modules(void)
647{
648 int ret = 0, i = 0;
649 char modprobe[256];
650
651 while (kernel_modules_list[i] != NULL) {
652 ret = snprintf(modprobe, sizeof(modprobe), "/sbin/modprobe %s",
653 kernel_modules_list[i]);
654 if (ret < 0) {
655 perror("snprintf modprobe");
656 goto error;
657 }
658 ret = system(modprobe);
659 if (ret < 0) {
660 ERR("Unable to load module %s", kernel_modules_list[i]);
661 }
662 DBG("Modprobe successfully %s", kernel_modules_list[i]);
663 i++;
664 }
665
666error:
667 return ret;
668}
669
670/*
671 * mount_debugfs
672 */
673static int mount_debugfs(char *path)
674{
675 int ret;
676 char *type = "debugfs";
677
678 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG);
679 if (ret < 0) {
680 goto error;
681 }
682
683 ret = mount(type, path, type, 0, NULL);
684 if (ret < 0) {
685 perror("mount debugfs");
686 goto error;
687 }
688
689 DBG("Mounted debugfs successfully at %s", path);
690
691error:
692 return ret;
693}
694
8c0faa1d 695/*
f3ed775e 696 * init_kernel_tracer
8c0faa1d 697 *
f3ed775e 698 * Setup necessary data for kernel tracer action.
8c0faa1d 699 */
f3ed775e 700static void init_kernel_tracer(void)
8c0faa1d 701{
b73401da
DG
702 int ret;
703 char *proc_mounts = "/proc/mounts";
704 char line[256];
705 char *debugfs_path = NULL, *lttng_path;
706 FILE *fp;
707
708 /* Detect debugfs */
709 fp = fopen(proc_mounts, "r");
710 if (fp == NULL) {
711 ERR("Unable to probe %s", proc_mounts);
712 goto error;
713 }
714
715 while (fgets(line, sizeof(line), fp) != NULL) {
716 if (strstr(line, "debugfs") != NULL) {
717 /* Remove first string */
718 strtok(line, " ");
719 /* Dup string here so we can reuse line later on */
720 debugfs_path = strdup(strtok(NULL, " "));
721 DBG("Got debugfs path : %s", debugfs_path);
722 break;
723 }
724 }
725
726 fclose(fp);
727
728 /* Mount debugfs if needded */
729 if (debugfs_path == NULL) {
730 ret = asprintf(&debugfs_path, "/mnt/debugfs");
731 if (ret < 0) {
732 perror("asprintf debugfs path");
733 goto error;
734 }
735 ret = mount_debugfs(debugfs_path);
736 if (ret < 0) {
737 goto error;
738 }
739 }
740
741 /* Modprobe lttng kernel modules */
742 ret = modprobe_kernel_modules();
743 if (ret < 0) {
744 goto error;
745 }
746
747 /* Setup lttng kernel path */
748 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
749 if (ret < 0) {
750 perror("asprintf lttng path");
751 goto error;
752 }
753
754 /* Open debugfs lttng */
755 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 756 if (kernel_tracer_fd < 0) {
b73401da
DG
757 DBG("Failed to open %s", lttng_path);
758 goto error;
8c0faa1d
DG
759 }
760
b73401da
DG
761 free(lttng_path);
762 free(debugfs_path);
f3ed775e 763 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
764 return;
765
766error:
767 if (lttng_path) {
768 free(lttng_path);
769 }
770 if (debugfs_path) {
771 free(debugfs_path);
772 }
773 WARN("No kernel tracer available");
774 kernel_tracer_fd = 0;
775 return;
f3ed775e 776}
33a2b854 777
f3ed775e
DG
778/*
779 * start_kernel_trace
780 *
781 * Start tracing by creating trace directory and sending FDs to the kernel
782 * consumer.
783 */
784static int start_kernel_trace(struct ltt_kernel_session *session)
785{
786 int ret;
8c0faa1d 787
f3ed775e
DG
788 /* Create trace directory */
789 ret = create_trace_dir(session);
1d4b027a 790 if (ret < 0) {
f3ed775e
DG
791 if (ret == -EEXIST) {
792 ret = LTTCOMM_KERN_DIR_EXIST;
793 } else {
794 ret = LTTCOMM_KERN_DIR_FAIL;
795 goto error;
33a2b854
DG
796 }
797 }
798
f3ed775e
DG
799 if (session->kconsumer_fds_sent == 0) {
800 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
801 if (ret < 0) {
802 ERR("Send kconsumerd fds failed");
803 ret = LTTCOMM_KERN_CONSUMER_FAIL;
804 goto error;
805 }
1d4b027a 806
f3ed775e
DG
807 session->kconsumer_fds_sent = 1;
808 }
1d4b027a
DG
809
810error:
811 return ret;
8c0faa1d
DG
812}
813
814/*
f3ed775e 815 * init_default_channel
8c0faa1d 816 *
f3ed775e 817 * Allocate a channel structure and fill it.
8c0faa1d 818 */
f3ed775e 819static struct lttng_channel *init_default_channel(void)
8c0faa1d 820{
f3ed775e 821 struct lttng_channel *chan;
1d4b027a 822
f3ed775e
DG
823 chan = malloc(sizeof(struct lttng_channel));
824 if (chan == NULL) {
825 perror("init channel malloc");
826 goto error;
8c0faa1d 827 }
1d4b027a 828
f3ed775e
DG
829 if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
830 perror("snprintf defautl channel name");
831 return NULL;
832 }
833
834 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
835 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
836 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
837 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
838 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 839 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1d4b027a
DG
840
841error:
f3ed775e 842 return chan;
8c0faa1d
DG
843}
844
333f285e 845/*
f3ed775e 846 * create_kernel_session
333f285e 847 *
f3ed775e 848 * Create a kernel tracer session then create the default channel.
333f285e 849 */
f3ed775e 850static int create_kernel_session(struct ltt_session *session)
333f285e 851{
f3ed775e
DG
852 int ret;
853 struct lttng_channel *chan;
854
855 DBG("Creating kernel session");
856
857 ret = kernel_create_session(session, kernel_tracer_fd);
858 if (ret < 0) {
859 ret = LTTCOMM_KERN_SESS_FAIL;
860 goto error;
333f285e
DG
861 }
862
f3ed775e
DG
863 chan = init_default_channel();
864 if (chan == NULL) {
865 ret = LTTCOMM_FATAL;
866 goto error;
867 }
868
869 DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
870
b082db07 871 ret = kernel_create_channel(session->kernel_session, chan, session->path);
f3ed775e
DG
872 if (ret < 0) {
873 ret = LTTCOMM_KERN_CHAN_FAIL;
874 goto error;
875 }
876
877error:
878 return ret;
333f285e
DG
879}
880
fac6795d
DG
881/*
882 * process_client_msg
883 *
5461b305
DG
884 * Process the command requested by the lttng client within the command
885 * context structure. This function make sure that the return structure (llm)
886 * is set and ready for transmission before returning.
fac6795d 887 *
e065084a 888 * Return any error encountered or 0 for success.
fac6795d 889 */
5461b305 890static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 891{
5461b305 892 int ret;
fac6795d 893
5461b305 894 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 895
f3ed775e 896 /* Listing commands don't need a session */
5461b305 897 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
898 case LTTNG_CREATE_SESSION:
899 case LTTNG_LIST_SESSIONS:
f3ed775e
DG
900 case LTTNG_LIST_EVENTS:
901 case LTTNG_KERNEL_LIST_EVENTS:
902 case LTTNG_LIST_TRACEABLE_APPS:
5e16da05
MD
903 break;
904 default:
f3ed775e
DG
905 DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
906 cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
5461b305 907 if (cmd_ctx->session == NULL) {
f3ed775e
DG
908 /* If session name not found */
909 if (cmd_ctx->lsm->session_name != NULL) {
910 ret = LTTCOMM_SESS_NOT_FOUND;
911 } else { /* If no session name specified */
912 ret = LTTCOMM_SELECT_SESS;
913 }
5461b305 914 goto error;
379473d2 915 }
5e16da05 916 break;
379473d2
DG
917 }
918
f3ed775e
DG
919 /*
920 * Check kernel command for kernel session.
921 */
20fe2104 922 switch (cmd_ctx->lsm->cmd_type) {
d65106b1 923 case LTTNG_KERNEL_ADD_CONTEXT:
f3ed775e
DG
924 case LTTNG_KERNEL_CREATE_CHANNEL:
925 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
926 case LTTNG_KERNEL_DISABLE_CHANNEL:
927 case LTTNG_KERNEL_DISABLE_EVENT:
928 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
929 case LTTNG_KERNEL_ENABLE_CHANNEL:
930 case LTTNG_KERNEL_ENABLE_EVENT:
931 case LTTNG_KERNEL_LIST_EVENTS:
333f285e 932 /* Kernel tracer check */
20fe2104 933 if (kernel_tracer_fd == 0) {
333f285e
DG
934 init_kernel_tracer();
935 if (kernel_tracer_fd == 0) {
936 ret = LTTCOMM_KERN_NA;
937 goto error;
938 }
20fe2104 939 }
f3ed775e
DG
940
941 /* Need a session for kernel command */
942 if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
943 cmd_ctx->session->kernel_session == NULL) {
7b395890 944
f3ed775e
DG
945 ret = create_kernel_session(cmd_ctx->session);
946 if (ret < 0) {
947 ret = LTTCOMM_KERN_SESS_FAIL;
948 goto error;
949 }
950
7b395890 951 /* Start the kernel consumer daemon */
f3ed775e
DG
952 if (kconsumerd_pid == 0) {
953 ret = start_kconsumerd();
954 if (ret < 0) {
955 goto error;
956 }
957 }
958 }
20fe2104
DG
959 }
960
471d1693 961 /* Connect to ust apps if available pid */
5461b305 962 if (cmd_ctx->lsm->pid > 0) {
471d1693 963 /* Connect to app using ustctl API */
5461b305
DG
964 cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
965 if (cmd_ctx->ust_sock < 0) {
471d1693 966 ret = LTTCOMM_NO_TRACEABLE;
5461b305 967 goto error;
471d1693
DG
968 }
969 }
970
fac6795d 971 /* Process by command type */
5461b305 972 switch (cmd_ctx->lsm->cmd_type) {
d65106b1
DG
973 case LTTNG_KERNEL_ADD_CONTEXT:
974 {
975 int found = 0, no_event = 0;
976 struct ltt_kernel_channel *chan;
977 struct ltt_kernel_event *event;
978
979 /* Setup lttng message with no payload */
980 ret = setup_lttng_msg(cmd_ctx, 0);
981 if (ret < 0) {
982 goto setup_error;
983 }
984
985 /* Check if event name is given */
986 if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
987 no_event = 1;
988 }
989
990 if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
991 /* Go over all channels */
992 DBG("Adding context to all channels");
993 cds_list_for_each_entry(chan,
994 &cmd_ctx->session->kernel_session->channel_list.head, list) {
995 if (no_event) {
996 ret = kernel_add_channel_context(chan,
997 &cmd_ctx->lsm->u.context.ctx);
998 if (ret < 0) {
999 continue;
1000 }
1001 } else {
1002 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
1003 if (event != NULL) {
1004 ret = kernel_add_event_context(event,
1005 &cmd_ctx->lsm->u.context.ctx);
1006 if (ret < 0) {
1007 ret = LTTCOMM_KERN_CONTEXT_FAIL;
1008 goto error;
1009 }
1010 found = 1;
1011 break;
1012 }
1013 }
1014 }
1015 } else {
1016 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
1017 cmd_ctx->session->kernel_session);
1018 if (chan == NULL) {
1019 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1020 goto error;
1021 }
1022
1023 if (no_event) {
1024 ret = kernel_add_channel_context(chan,
1025 &cmd_ctx->lsm->u.context.ctx);
1026 if (ret < 0) {
1027 ret = LTTCOMM_KERN_CONTEXT_FAIL;
1028 goto error;
1029 }
1030 } else {
1031 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
1032 if (event != NULL) {
1033 ret = kernel_add_event_context(event,
1034 &cmd_ctx->lsm->u.context.ctx);
1035 if (ret < 0) {
1036 ret = LTTCOMM_KERN_CONTEXT_FAIL;
1037 goto error;
1038 }
1039 }
1040 }
1041 }
1042
1043 if (!found && !no_event) {
1044 ret = LTTCOMM_NO_EVENT;
1045 goto error;
1046 }
1047
1048 ret = LTTCOMM_OK;
1049 break;
1050 }
f3ed775e 1051 case LTTNG_KERNEL_CREATE_CHANNEL:
20fe2104 1052 {
f3ed775e 1053 /* Setup lttng message with no payload */
20fe2104
DG
1054 ret = setup_lttng_msg(cmd_ctx, 0);
1055 if (ret < 0) {
1056 goto setup_error;
1057 }
1058
f3ed775e 1059 /* Kernel tracer */
8c0faa1d
DG
1060 DBG("Creating kernel channel");
1061
f3ed775e 1062 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
b082db07 1063 &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path);
20fe2104
DG
1064 if (ret < 0) {
1065 ret = LTTCOMM_KERN_CHAN_FAIL;
1066 goto error;
1067 }
1068
1069 ret = LTTCOMM_OK;
1070 break;
1071 }
26cc6b4e
DG
1072 case LTTNG_KERNEL_DISABLE_CHANNEL:
1073 {
1074 struct ltt_kernel_channel *chan;
1075
1076 /* Setup lttng message with no payload */
1077 ret = setup_lttng_msg(cmd_ctx, 0);
1078 if (ret < 0) {
1079 goto setup_error;
1080 }
1081
1082 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1083 cmd_ctx->session->kernel_session);
1084 if (chan == NULL) {
1085 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1086 goto error;
1087 } else if (chan->enabled == 1) {
1088 ret = kernel_disable_channel(chan);
1089 if (ret < 0) {
1090 if (ret != EEXIST) {
1091 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
1092 }
1093 goto error;
1094 }
1095 }
1096
1097 kernel_wait_quiescent(kernel_tracer_fd);
1098 ret = LTTCOMM_OK;
1099 break;
1100 }
e953ef25
DG
1101 case LTTNG_KERNEL_DISABLE_EVENT:
1102 {
e953ef25 1103 struct ltt_kernel_channel *chan;
19e70852 1104 struct ltt_kernel_event *ev;
e953ef25
DG
1105
1106 /* Setup lttng message with no payload */
1107 ret = setup_lttng_msg(cmd_ctx, 0);
1108 if (ret < 0) {
1109 goto setup_error;
1110 }
1111
19e70852
DG
1112 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1113 cmd_ctx->session->kernel_session);
1114 if (chan == NULL) {
1115 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1116 goto error;
1117 }
e953ef25 1118
19e70852
DG
1119 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
1120 if (ev != NULL) {
1121 DBG("Disabling kernel event %s for channel %s.",
1122 cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
1123 ret = kernel_disable_event(ev);
1124 if (ret < 0) {
1125 ret = LTTCOMM_KERN_ENABLE_FAIL;
1126 goto error;
e953ef25
DG
1127 }
1128 }
1129
19e70852
DG
1130 kernel_wait_quiescent(kernel_tracer_fd);
1131 ret = LTTCOMM_OK;
e953ef25
DG
1132 break;
1133 }
950131af
DG
1134 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
1135 {
1136 struct ltt_kernel_channel *chan;
1137 struct ltt_kernel_event *ev;
1138
1139 /* Setup lttng message with no payload */
1140 ret = setup_lttng_msg(cmd_ctx, 0);
1141 if (ret < 0) {
1142 goto setup_error;
1143 }
1144
1145 DBG("Disabling all enabled kernel events");
1146
1147 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1148 cmd_ctx->session->kernel_session);
1149 if (chan == NULL) {
1150 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1151 goto error;
1152 }
1153
1154 /* For each event in the kernel session */
1155 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1156 DBG("Disabling kernel event %s for channel %s.",
1157 ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
1158 ret = kernel_disable_event(ev);
1159 if (ret < 0) {
1160 continue;
1161 }
1162 }
1163
1164 /* Quiescent wait after event disable */
1165 kernel_wait_quiescent(kernel_tracer_fd);
1166 ret = LTTCOMM_OK;
1167 break;
1168 }
d36b8583
DG
1169 case LTTNG_KERNEL_ENABLE_CHANNEL:
1170 {
1171 struct ltt_kernel_channel *chan;
1172
1173 /* Setup lttng message with no payload */
1174 ret = setup_lttng_msg(cmd_ctx, 0);
1175 if (ret < 0) {
1176 goto setup_error;
1177 }
1178
1179 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1180 cmd_ctx->session->kernel_session);
1181 if (chan == NULL) {
1182 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1183 goto error;
1184 } else if (chan->enabled == 0) {
1185 ret = kernel_enable_channel(chan);
1186 if (ret < 0) {
1187 if (ret != EEXIST) {
1188 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
1189 }
1190 goto error;
1191 }
1192 }
1193
1194 kernel_wait_quiescent(kernel_tracer_fd);
1195 ret = LTTCOMM_OK;
1196 break;
1197 }
f3ed775e 1198 case LTTNG_KERNEL_ENABLE_EVENT:
894be886 1199 {
f3ed775e 1200 struct ltt_kernel_channel *chan;
19e70852 1201 struct ltt_kernel_event *ev;
f3ed775e 1202
894be886
DG
1203 /* Setup lttng message with no payload */
1204 ret = setup_lttng_msg(cmd_ctx, 0);
1205 if (ret < 0) {
1206 goto setup_error;
1207 }
1208
19e70852
DG
1209 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1210 cmd_ctx->session->kernel_session);
1211 if (chan == NULL) {
1212 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1213 goto error;
f34daff7
DG
1214 }
1215
19e70852
DG
1216 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
1217 if (ev == NULL) {
1218 DBG("Creating kernel event %s for channel %s.",
950131af 1219 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852 1220 ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
f3ed775e 1221 } else {
19e70852 1222 DBG("Enabling kernel event %s for channel %s.",
950131af 1223 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852
DG
1224 ret = kernel_enable_event(ev);
1225 }
1226
1227 if (ret < 0) {
1228 ret = LTTCOMM_KERN_ENABLE_FAIL;
1229 goto error;
f3ed775e 1230 }
19e70852
DG
1231
1232 kernel_wait_quiescent(kernel_tracer_fd);
1233 ret = LTTCOMM_OK;
894be886
DG
1234 break;
1235 }
f3ed775e 1236 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
33a2b854 1237 {
950131af 1238 int pos, size;
33a2b854 1239 char *event_list, *event, *ptr;
f3ed775e 1240 struct ltt_kernel_channel *chan;
950131af
DG
1241 struct ltt_kernel_event *ev;
1242 struct lttng_event ev_attr;
33a2b854
DG
1243
1244 /* Setup lttng message with no payload */
1245 ret = setup_lttng_msg(cmd_ctx, 0);
1246 if (ret < 0) {
1247 goto setup_error;
1248 }
1249
1250 DBG("Enabling all kernel event");
1251
950131af
DG
1252 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1253 cmd_ctx->session->kernel_session);
1254 if (chan == NULL) {
1255 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
33a2b854
DG
1256 goto error;
1257 }
1258
950131af
DG
1259 /* For each event in the kernel session */
1260 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1261 DBG("Enabling kernel event %s for channel %s.",
1262 ev->event->name, chan->channel->name);
1263 ret = kernel_enable_event(ev);
1264 if (ret < 0) {
1265 continue;
f3ed775e
DG
1266 }
1267 }
1268
950131af
DG
1269 size = kernel_list_events(kernel_tracer_fd, &event_list);
1270 if (size < 0) {
1271 ret = LTTCOMM_KERN_LIST_FAIL;
f3ed775e
DG
1272 goto error;
1273 }
1274
33a2b854
DG
1275 ptr = event_list;
1276 while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
950131af
DG
1277 ev = get_kernel_event_by_name(event, chan);
1278 if (ev == NULL) {
1279 strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
1280 /* Default event type for enable all */
1281 ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
1282 /* Enable each single tracepoint event */
1283 ret = kernel_create_event(&ev_attr, chan);
1284 if (ret < 0) {
1285 /* Ignore error here and continue */
950131af 1286 }
33a2b854 1287 }
950131af 1288
33a2b854
DG
1289 /* Move pointer to the next line */
1290 ptr += pos + 1;
1291 free(event);
1292 }
1293
1294 free(event_list);
1295
f3ed775e
DG
1296 /* Quiescent wait after event enable */
1297 kernel_wait_quiescent(kernel_tracer_fd);
33a2b854
DG
1298 ret = LTTCOMM_OK;
1299 break;
1300 }
f3ed775e 1301 case LTTNG_KERNEL_LIST_EVENTS:
2ef84c95
DG
1302 {
1303 char *event_list;
f3ed775e
DG
1304 ssize_t size = 0;
1305
1306 DBG("Listing kernel events");
2ef84c95
DG
1307
1308 size = kernel_list_events(kernel_tracer_fd, &event_list);
1309 if (size < 0) {
1310 ret = LTTCOMM_KERN_LIST_FAIL;
1311 goto error;
1312 }
1313
1314 /*
1315 * Setup lttng message with payload size set to the event list size in
1316 * bytes and then copy list into the llm payload.
1317 */
1318 ret = setup_lttng_msg(cmd_ctx, size);
1319 if (ret < 0) {
1320 goto setup_error;
1321 }
1322
1323 /* Copy event list into message payload */
1324 memcpy(cmd_ctx->llm->payload, event_list, size);
1325
1326 free(event_list);
1327
1328 ret = LTTCOMM_OK;
1329 break;
1330 }
f3ed775e 1331 case LTTNG_START_TRACE:
8c0faa1d
DG
1332 {
1333 struct ltt_kernel_channel *chan;
f3ed775e 1334
8c0faa1d
DG
1335 /* Setup lttng message with no payload */
1336 ret = setup_lttng_msg(cmd_ctx, 0);
1337 if (ret < 0) {
1338 goto setup_error;
1339 }
1340
f3ed775e
DG
1341 /* Kernel tracing */
1342 if (cmd_ctx->session->kernel_session != NULL) {
1343 if (cmd_ctx->session->kernel_session->metadata == NULL) {
1344 DBG("Open kernel metadata");
58a97671
DG
1345 ret = kernel_open_metadata(cmd_ctx->session->kernel_session,
1346 cmd_ctx->session->path);
f3ed775e
DG
1347 if (ret < 0) {
1348 ret = LTTCOMM_KERN_META_FAIL;
1349 goto error;
1350 }
1351 }
8c0faa1d 1352
f3ed775e
DG
1353 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1354 DBG("Opening kernel metadata stream");
1355 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1356 ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
1357 if (ret < 0) {
1358 ERR("Kernel create metadata stream failed");
1359 ret = LTTCOMM_KERN_STREAM_FAIL;
1360 goto error;
1361 }
1362 }
1363 }
8c0faa1d 1364
f3ed775e
DG
1365 /* For each channel */
1366 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
1367 if (chan->stream_count == 0) {
1368 ret = kernel_open_channel_stream(chan);
1369 if (ret < 0) {
1370 ERR("Kernel create channel stream failed");
1371 ret = LTTCOMM_KERN_STREAM_FAIL;
1372 goto error;
1373 }
1374 /* Update the stream global counter */
1375 cmd_ctx->session->kernel_session->stream_count_global += ret;
1376 }
1377 }
1378
1379 DBG("Start kernel tracing");
1380 ret = kernel_start_session(cmd_ctx->session->kernel_session);
8c0faa1d 1381 if (ret < 0) {
f3ed775e
DG
1382 ERR("Kernel start session failed");
1383 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1384 goto error;
1385 }
8c0faa1d 1386
f3ed775e
DG
1387 ret = start_kernel_trace(cmd_ctx->session->kernel_session);
1388 if (ret < 0) {
1389 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1390 goto error;
1391 }
8c0faa1d 1392
f3ed775e
DG
1393 /* Quiescent wait after starting trace */
1394 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1395 }
1396
f3ed775e 1397 /* TODO: Start all UST traces */
8c0faa1d
DG
1398
1399 ret = LTTCOMM_OK;
1400 break;
1401 }
f3ed775e 1402 case LTTNG_STOP_TRACE:
8c0faa1d 1403 {
f3ed775e 1404 struct ltt_kernel_channel *chan;
8c0faa1d
DG
1405 /* Setup lttng message with no payload */
1406 ret = setup_lttng_msg(cmd_ctx, 0);
1407 if (ret < 0) {
1408 goto setup_error;
1409 }
1410
f3ed775e
DG
1411 /* Kernel tracer */
1412 if (cmd_ctx->session->kernel_session != NULL) {
1413 DBG("Stop kernel tracing");
84291629 1414
f3ed775e
DG
1415 ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
1416 if (ret < 0) {
1417 ERR("Kernel metadata flush failed");
1418 }
8c0faa1d 1419
f3ed775e
DG
1420 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
1421 ret = kernel_flush_buffer(chan);
1422 if (ret < 0) {
1423 ERR("Kernel flush buffer error");
1424 }
1425 }
1426
1427 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
1428 if (ret < 0) {
1429 ERR("Kernel stop session failed");
1430 ret = LTTCOMM_KERN_STOP_FAIL;
1431 goto error;
1432 }
1433
1434 /* Quiescent wait after stopping trace */
1435 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1436 }
1437
f3ed775e 1438 /* TODO : User-space tracer */
8c0faa1d
DG
1439
1440 ret = LTTCOMM_OK;
1441 break;
1442 }
5e16da05
MD
1443 case LTTNG_CREATE_SESSION:
1444 {
5461b305
DG
1445 /* Setup lttng message with no payload */
1446 ret = setup_lttng_msg(cmd_ctx, 0);
1447 if (ret < 0) {
1448 goto setup_error;
1449 }
1450
f3ed775e 1451 ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path);
5e16da05 1452 if (ret < 0) {
f3ed775e 1453 if (ret == -EEXIST) {
5e16da05
MD
1454 ret = LTTCOMM_EXIST_SESS;
1455 } else {
aaf97519 1456 ret = LTTCOMM_FATAL;
aaf97519 1457 }
5461b305 1458 goto error;
8028d920 1459 }
1657e9bb 1460
5461b305 1461 ret = LTTCOMM_OK;
5e16da05
MD
1462 break;
1463 }
1464 case LTTNG_DESTROY_SESSION:
1465 {
5461b305
DG
1466 /* Setup lttng message with no payload */
1467 ret = setup_lttng_msg(cmd_ctx, 0);
1468 if (ret < 0) {
1469 goto setup_error;
1470 }
1471
f3ed775e
DG
1472 /* Clean kernel session teardown */
1473 teardown_kernel_session(cmd_ctx->session);
1474
1475 ret = destroy_session(cmd_ctx->lsm->session_name);
5e16da05 1476 if (ret < 0) {
f3ed775e 1477 ret = LTTCOMM_FATAL;
5461b305 1478 goto error;
5e16da05 1479 }
1657e9bb 1480
5461b305
DG
1481 ret = LTTCOMM_OK;
1482 break;
5e16da05 1483 }
f3ed775e 1484 /*
5e16da05
MD
1485 case LTTNG_LIST_TRACES:
1486 {
5461b305 1487 unsigned int trace_count;
1657e9bb 1488
5461b305 1489 trace_count = get_trace_count_per_session(cmd_ctx->session);
5e16da05
MD
1490 if (trace_count == 0) {
1491 ret = LTTCOMM_NO_TRACE;
5461b305 1492 goto error;
1657e9bb 1493 }
df0da139 1494
5461b305
DG
1495 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
1496 if (ret < 0) {
1497 goto setup_error;
df0da139 1498 }
ca95a216 1499
5461b305
DG
1500 get_traces_per_session(cmd_ctx->session,
1501 (struct lttng_trace *)(cmd_ctx->llm->payload));
1502
1503 ret = LTTCOMM_OK;
5e16da05
MD
1504 break;
1505 }
f3ed775e
DG
1506 */
1507 /*
5e16da05
MD
1508 case UST_CREATE_TRACE:
1509 {
5461b305 1510 ret = setup_lttng_msg(cmd_ctx, 0);
5e16da05 1511 if (ret < 0) {
5461b305 1512 goto setup_error;
fac6795d 1513 }
ce3d728c 1514
5461b305
DG
1515 ret = ust_create_trace(cmd_ctx);
1516 if (ret < 0) {
f3ed775e 1517 goto error;
5461b305
DG
1518 }
1519 break;
5e16da05 1520 }
f3ed775e
DG
1521 */
1522 case LTTNG_LIST_TRACEABLE_APPS:
5e16da05 1523 {
5461b305
DG
1524 unsigned int app_count;
1525
1526 app_count = get_app_count();
1527 DBG("Traceable application count : %d", app_count);
5e16da05
MD
1528 if (app_count == 0) {
1529 ret = LTTCOMM_NO_APPS;
5461b305 1530 goto error;
ce3d728c 1531 }
520ff687 1532
5461b305
DG
1533 ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
1534 if (ret < 0) {
1535 goto setup_error;
520ff687 1536 }
57167058 1537
5461b305 1538 get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
5e16da05 1539
5461b305 1540 ret = LTTCOMM_OK;
5e16da05
MD
1541 break;
1542 }
f3ed775e 1543 /*
5e16da05
MD
1544 case UST_START_TRACE:
1545 {
5461b305
DG
1546 ret = setup_lttng_msg(cmd_ctx, 0);
1547 if (ret < 0) {
1548 goto setup_error;
1549 }
ca95a216 1550
5461b305
DG
1551 ret = ust_start_trace(cmd_ctx);
1552 if (ret < 0) {
1553 goto setup_error;
1554 }
1555 break;
5e16da05
MD
1556 }
1557 case UST_STOP_TRACE:
1558 {
5461b305
DG
1559 ret = setup_lttng_msg(cmd_ctx, 0);
1560 if (ret < 0) {
1561 goto setup_error;
1562 }
ca95a216 1563
5461b305
DG
1564 ret = ust_stop_trace(cmd_ctx);
1565 if (ret < 0) {
1566 goto setup_error;
1567 }
1568 break;
5e16da05 1569 }
f3ed775e 1570 */
5e16da05
MD
1571 case LTTNG_LIST_SESSIONS:
1572 {
5461b305
DG
1573 unsigned int session_count;
1574
1575 session_count = get_session_count();
5e16da05 1576 if (session_count == 0) {
f3ed775e 1577 ret = LTTCOMM_NO_SESSION;
5461b305 1578 goto error;
57167058 1579 }
5e16da05 1580
5461b305
DG
1581 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
1582 if (ret < 0) {
1583 goto setup_error;
e065084a 1584 }
5e16da05 1585
5461b305 1586 get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
5e16da05 1587
5461b305 1588 ret = LTTCOMM_OK;
5e16da05
MD
1589 break;
1590 }
1591 default:
1592 /* Undefined command */
5461b305
DG
1593 ret = setup_lttng_msg(cmd_ctx, 0);
1594 if (ret < 0) {
1595 goto setup_error;
1596 }
1597
5e16da05 1598 ret = LTTCOMM_UND;
5461b305 1599 break;
fac6795d
DG
1600 }
1601
5461b305
DG
1602 /* Set return code */
1603 cmd_ctx->llm->ret_code = ret;
ca95a216 1604
e065084a
DG
1605 return ret;
1606
5461b305 1607error:
5461b305
DG
1608 if (cmd_ctx->llm == NULL) {
1609 DBG("Missing llm structure. Allocating one.");
894be886 1610 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
1611 goto setup_error;
1612 }
1613 }
e065084a 1614 /* Notify client of error */
5461b305 1615 cmd_ctx->llm->ret_code = ret;
e065084a 1616
5461b305 1617setup_error:
8028d920 1618 return ret;
fac6795d
DG
1619}
1620
1d4b027a
DG
1621/*
1622 * thread_manage_clients
1623 *
1624 * This thread manage all clients request using the unix
1625 * client socket for communication.
1626 */
1627static void *thread_manage_clients(void *data)
1628{
1629 int sock, ret;
1630 struct command_ctx *cmd_ctx;
1631
1632 DBG("[thread] Manage client started");
1633
1634 ret = lttcomm_listen_unix_sock(client_sock);
1635 if (ret < 0) {
1636 goto error;
1637 }
1638
1639 /* Notify parent pid that we are ready
1640 * to accept command for client side.
1641 */
1642 if (opt_sig_parent) {
1643 kill(ppid, SIGCHLD);
1644 }
1645
1646 while (1) {
1647 /* Blocking call, waiting for transmission */
1648 DBG("Accepting client command ...");
1649 sock = lttcomm_accept_unix_sock(client_sock);
1650 if (sock < 0) {
1651 goto error;
1652 }
1653
1654 /* Allocate context command to process the client request */
1655 cmd_ctx = malloc(sizeof(struct command_ctx));
1656
1657 /* Allocate data buffer for reception */
1658 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
1659 cmd_ctx->llm = NULL;
1660 cmd_ctx->session = NULL;
1661
1662 /*
1663 * Data is received from the lttng client. The struct
1664 * lttcomm_session_msg (lsm) contains the command and data request of
1665 * the client.
1666 */
1667 DBG("Receiving data from client ...");
1668 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
1669 if (ret <= 0) {
1670 continue;
1671 }
1672
f7776ea7
DG
1673 // TODO: Validate cmd_ctx including sanity check for security purpose.
1674
1d4b027a
DG
1675 /*
1676 * This function dispatch the work to the kernel or userspace tracer
1677 * libs and fill the lttcomm_lttng_msg data structure of all the needed
1678 * informations for the client. The command context struct contains
1679 * everything this function may needs.
1680 */
1681 ret = process_client_msg(cmd_ctx);
1682 if (ret < 0) {
1683 /* TODO: Inform client somehow of the fatal error. At this point,
1684 * ret < 0 means that a malloc failed (ENOMEM). */
1685 /* Error detected but still accept command */
1686 clean_command_ctx(cmd_ctx);
1687 continue;
1688 }
1689
1690 DBG("Sending response (size: %d, retcode: %d)",
1691 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
1692 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1693 if (ret < 0) {
1694 ERR("Failed to send data back to client");
1695 }
1696
1697 clean_command_ctx(cmd_ctx);
d6e4fca4
DG
1698
1699 /* End of transmission */
1700 close(sock);
1d4b027a
DG
1701 }
1702
1703error:
1704 return NULL;
1705}
1706
1707
fac6795d
DG
1708/*
1709 * usage function on stderr
1710 */
1711static void usage(void)
1712{
b716ce68 1713 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
1714 fprintf(stderr, " -h, --help Display this usage.\n");
1715 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
1716 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
1717 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
1718 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
1719 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
1720 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
1721 fprintf(stderr, " -V, --version Show version number.\n");
1722 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
1723 fprintf(stderr, " -q, --quiet No output at all.\n");
1724 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
fac6795d
DG
1725}
1726
1727/*
1728 * daemon argument parsing
1729 */
1730static int parse_args(int argc, char **argv)
1731{
1732 int c;
1733
1734 static struct option long_options[] = {
1735 { "client-sock", 1, 0, 'c' },
1736 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
1737 { "kconsumerd-cmd-sock", 1, 0, 0 },
1738 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 1739 { "daemonize", 0, 0, 'd' },
5b8719f5 1740 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
1741 { "help", 0, 0, 'h' },
1742 { "group", 1, 0, 'g' },
1743 { "version", 0, 0, 'V' },
75462a81 1744 { "quiet", 0, 0, 'q' },
3f9947db 1745 { "verbose", 0, 0, 'v' },
fac6795d
DG
1746 { NULL, 0, 0, 0 }
1747 };
1748
1749 while (1) {
1750 int option_index = 0;
d6f42150 1751 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index);
fac6795d
DG
1752 if (c == -1) {
1753 break;
1754 }
1755
1756 switch (c) {
1757 case 0:
1758 fprintf(stderr, "option %s", long_options[option_index].name);
1759 if (optarg) {
1760 fprintf(stderr, " with arg %s\n", optarg);
1761 }
1762 break;
b716ce68 1763 case 'c':
fac6795d
DG
1764 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
1765 break;
1766 case 'a':
1767 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
1768 break;
1769 case 'd':
1770 opt_daemon = 1;
1771 break;
1772 case 'g':
1773 opt_tracing_group = strdup(optarg);
1774 break;
1775 case 'h':
1776 usage();
1777 exit(EXIT_FAILURE);
1778 case 'V':
1779 fprintf(stdout, "%s\n", VERSION);
1780 exit(EXIT_SUCCESS);
5b8719f5
DG
1781 case 'S':
1782 opt_sig_parent = 1;
1783 break;
d6f42150
DG
1784 case 'E':
1785 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
1786 break;
1787 case 'C':
1788 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
1789 break;
75462a81
DG
1790 case 'q':
1791 opt_quiet = 1;
1792 break;
3f9947db
DG
1793 case 'v':
1794 opt_verbose = 1;
1795 break;
fac6795d
DG
1796 default:
1797 /* Unknown option or other error.
1798 * Error is printed by getopt, just return */
1799 return -1;
1800 }
1801 }
1802
1803 return 0;
1804}
1805
1806/*
1807 * init_daemon_socket
1808 *
1809 * Creates the two needed socket by the daemon.
d6f42150
DG
1810 * apps_sock - The communication socket for all UST apps.
1811 * client_sock - The communication of the cli tool (lttng).
fac6795d
DG
1812 */
1813static int init_daemon_socket()
1814{
1815 int ret = 0;
1816 mode_t old_umask;
1817
1818 old_umask = umask(0);
1819
1820 /* Create client tool unix socket */
d6f42150
DG
1821 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
1822 if (client_sock < 0) {
1823 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
1824 ret = -1;
1825 goto end;
1826 }
1827
1828 /* File permission MUST be 660 */
1829 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1830 if (ret < 0) {
d6f42150 1831 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
1832 perror("chmod");
1833 goto end;
1834 }
1835
1836 /* Create the application unix socket */
d6f42150
DG
1837 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
1838 if (apps_sock < 0) {
1839 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
1840 ret = -1;
1841 goto end;
1842 }
1843
d6f42150 1844 /* File permission MUST be 666 */
fac6795d
DG
1845 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1846 if (ret < 0) {
d6f42150 1847 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
1848 perror("chmod");
1849 goto end;
1850 }
1851
1852end:
1853 umask(old_umask);
1854 return ret;
1855}
1856
1857/*
1858 * check_existing_daemon
1859 *
1860 * Check if the global socket is available.
62bd06d8 1861 * If yes, error is returned.
fac6795d
DG
1862 */
1863static int check_existing_daemon()
1864{
1865 int ret;
1866
1867 ret = access(client_unix_sock_path, F_OK);
1868 if (ret == 0) {
1869 ret = access(apps_unix_sock_path, F_OK);
1870 }
1871
1872 return ret;
1873}
1874
fac6795d 1875/*
d6f42150 1876 * set_permissions
fac6795d 1877 *
5e16da05
MD
1878 * Set the tracing group gid onto the client socket.
1879 *
1880 * Race window between mkdir and chown is OK because we are going from
a463f419 1881 * more permissive (root.root) to les permissive (root.tracing).
fac6795d 1882 */
d6f42150 1883static int set_permissions(void)
fac6795d
DG
1884{
1885 int ret;
1886 struct group *grp;
1887
1888 /* Decide which group name to use */
1889 (opt_tracing_group != NULL) ?
1890 (grp = getgrnam(opt_tracing_group)) :
1891 (grp = getgrnam(default_tracing_group));
1892
1893 if (grp == NULL) {
a463f419
DG
1894 if (is_root) {
1895 WARN("No tracing group detected");
1896 ret = 0;
1897 } else {
1898 ERR("Missing tracing group. Aborting execution.");
1899 ret = -1;
1900 }
fac6795d
DG
1901 goto end;
1902 }
1903
d6f42150
DG
1904 /* Set lttng run dir */
1905 ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
1906 if (ret < 0) {
1907 ERR("Unable to set group on " LTTNG_RUNDIR);
1908 perror("chown");
1909 }
1910
1911 /* lttng client socket path */
fac6795d
DG
1912 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
1913 if (ret < 0) {
d6f42150
DG
1914 ERR("Unable to set group on %s", client_unix_sock_path);
1915 perror("chown");
1916 }
1917
1918 /* kconsumerd error socket path */
1919 ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
1920 if (ret < 0) {
1921 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
1922 perror("chown");
1923 }
1924
d6f42150 1925 DBG("All permissions are set");
e07ae692 1926
fac6795d
DG
1927end:
1928 return ret;
1929}
1930
d6f42150
DG
1931/*
1932 * create_lttng_rundir
1933 *
1934 * Create the lttng run directory needed for all
1935 * global sockets and pipe.
1936 */
1937static int create_lttng_rundir(void)
1938{
1939 int ret;
1940
1941 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
1942 if (ret < 0) {
b1f11e69
DG
1943 if (errno != EEXIST) {
1944 ERR("Unable to create " LTTNG_RUNDIR);
1945 goto error;
1946 } else {
1947 ret = 0;
1948 }
d6f42150
DG
1949 }
1950
1951error:
1952 return ret;
1953}
1954
1955/*
1956 * set_kconsumerd_sockets
1957 *
1958 * Setup sockets and directory needed by the kconsumerd
1959 * communication with the session daemon.
1960 */
1961static int set_kconsumerd_sockets(void)
1962{
1963 int ret;
1964
1965 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
1966 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
1967 }
1968
1969 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
1970 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
1971 }
1972
1973 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
1974 if (ret < 0) {
6beb2242
DG
1975 if (errno != EEXIST) {
1976 ERR("Failed to create " KCONSUMERD_PATH);
1977 goto error;
1978 }
1979 ret = 0;
d6f42150
DG
1980 }
1981
1982 /* Create the kconsumerd error unix socket */
1983 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
1984 if (kconsumerd_err_sock < 0) {
1985 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
1986 ret = -1;
1987 goto error;
1988 }
1989
1990 /* File permission MUST be 660 */
1991 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1992 if (ret < 0) {
1993 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
1994 perror("chmod");
1995 goto error;
1996 }
1997
1998error:
1999 return ret;
2000}
2001
fac6795d 2002/*
62bd06d8 2003 * sighandler
fac6795d 2004 *
62bd06d8 2005 * Signal handler for the daemon
fac6795d
DG
2006 */
2007static void sighandler(int sig)
2008{
2009 switch (sig) {
2010 case SIGPIPE:
e07ae692 2011 DBG("SIGPIPE catched");
87378cf5 2012 return;
fac6795d 2013 case SIGINT:
e07ae692
DG
2014 DBG("SIGINT catched");
2015 cleanup();
2016 break;
fac6795d 2017 case SIGTERM:
e07ae692 2018 DBG("SIGTERM catched");
fac6795d 2019 cleanup();
686204ab 2020 break;
fac6795d
DG
2021 default:
2022 break;
2023 }
2024
2025 exit(EXIT_SUCCESS);
2026}
2027
2028/*
1d4b027a 2029 * set_signal_handler
fac6795d 2030 *
1d4b027a
DG
2031 * Setup signal handler for :
2032 * SIGINT, SIGTERM, SIGPIPE
fac6795d 2033 */
1d4b027a 2034static int set_signal_handler(void)
fac6795d 2035{
1d4b027a
DG
2036 int ret = 0;
2037 struct sigaction sa;
2038 sigset_t sigset;
fac6795d 2039
1d4b027a
DG
2040 if ((ret = sigemptyset(&sigset)) < 0) {
2041 perror("sigemptyset");
2042 return ret;
2043 }
d6f42150 2044
1d4b027a
DG
2045 sa.sa_handler = sighandler;
2046 sa.sa_mask = sigset;
2047 sa.sa_flags = 0;
2048 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
2049 perror("sigaction");
2050 return ret;
d6f42150
DG
2051 }
2052
1d4b027a
DG
2053 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
2054 perror("sigaction");
2055 return ret;
d6f42150 2056 }
aaf26714 2057
1d4b027a
DG
2058 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
2059 perror("sigaction");
2060 return ret;
8c0faa1d
DG
2061 }
2062
1d4b027a
DG
2063 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2064
2065 return ret;
fac6795d
DG
2066}
2067
f3ed775e
DG
2068/*
2069 * set_ulimit
2070 *
2071 * Set open files limit to unlimited. This daemon can open a large number of
2072 * file descriptors in order to consumer multiple kernel traces.
2073 */
2074static void set_ulimit(void)
2075{
2076 int ret;
2077 struct rlimit lim;
2078
2079 lim.rlim_cur = 65535;
2080 lim.rlim_max = 65535;
2081
2082 ret = setrlimit(RLIMIT_NOFILE, &lim);
2083 if (ret < 0) {
2084 perror("failed to set open files limit");
2085 }
2086}
2087
fac6795d
DG
2088/*
2089 * main
2090 */
2091int main(int argc, char **argv)
2092{
fac6795d
DG
2093 int ret = 0;
2094 void *status;
b082db07 2095 const char *home_path;
fac6795d
DG
2096
2097 /* Parse arguments */
2098 progname = argv[0];
2099 if ((ret = parse_args(argc, argv) < 0)) {
2100 goto error;
2101 }
2102
2103 /* Daemonize */
2104 if (opt_daemon) {
53094c05
DG
2105 ret = daemon(0, 0);
2106 if (ret < 0) {
2107 perror("daemon");
2108 goto error;
2109 }
fac6795d
DG
2110 }
2111
2112 /* Check if daemon is UID = 0 */
2113 is_root = !getuid();
2114
fac6795d 2115 if (is_root) {
d6f42150
DG
2116 ret = create_lttng_rundir();
2117 if (ret < 0) {
2118 goto error;
2119 }
2120
fac6795d 2121 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2122 snprintf(apps_unix_sock_path, PATH_MAX,
2123 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
2124 }
2125
2126 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2127 snprintf(client_unix_sock_path, PATH_MAX,
2128 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
2129 }
2130
2131 ret = set_kconsumerd_sockets();
2132 if (ret < 0) {
2133 goto error;
fac6795d 2134 }
20fe2104
DG
2135
2136 /* Setup kernel tracer */
2137 init_kernel_tracer();
f3ed775e
DG
2138
2139 /* Set ulimit for open files */
2140 set_ulimit();
fac6795d 2141 } else {
b082db07
DG
2142 home_path = get_home_dir();
2143 if (home_path == NULL) {
2144 ERR("Can't get HOME directory for sockets creation.\n \
2145 Please specify --socket PATH.");
2146 goto error;
2147 }
2148
fac6795d 2149 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 2150 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 2151 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
2152 }
2153
2154 /* Set the cli tool unix socket path */
2155 if (strlen(client_unix_sock_path) == 0) {
d6f42150 2156 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 2157 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d
DG
2158 }
2159 }
2160
847177cd
DG
2161 DBG("Client socket path %s", client_unix_sock_path);
2162 DBG("Application socket path %s", apps_unix_sock_path);
2163
fac6795d
DG
2164 /* See if daemon already exist. If any of the two
2165 * socket needed by the daemon are present, this test fails
2166 */
2167 if ((ret = check_existing_daemon()) == 0) {
75462a81 2168 ERR("Already running daemon.\n");
ab118b20 2169 /* We do not goto error because we must not
d6f42150 2170 * cleanup() because a daemon is already running.
ab118b20 2171 */
5e16da05 2172 exit(EXIT_FAILURE);
fac6795d
DG
2173 }
2174
2175 if (set_signal_handler() < 0) {
2176 goto error;
2177 }
2178
d6f42150 2179 /* Setup the needed unix socket */
fac6795d
DG
2180 if (init_daemon_socket() < 0) {
2181 goto error;
2182 }
2183
2184 /* Set credentials to socket */
d6f42150 2185 if (is_root && (set_permissions() < 0)) {
fac6795d
DG
2186 goto error;
2187 }
2188
5b8719f5
DG
2189 /* Get parent pid if -S, --sig-parent is specified. */
2190 if (opt_sig_parent) {
2191 ppid = getppid();
2192 }
2193
fac6795d
DG
2194 while (1) {
2195 /* Create thread to manage the client socket */
1d4b027a 2196 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
fac6795d
DG
2197 if (ret != 0) {
2198 perror("pthread_create");
2199 goto error;
2200 }
2201
2202 /* Create thread to manage application socket */
1d4b027a 2203 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
fac6795d
DG
2204 if (ret != 0) {
2205 perror("pthread_create");
2206 goto error;
2207 }
2208
1d4b027a
DG
2209 ret = pthread_join(client_thread, &status);
2210 if (ret != 0) {
2211 perror("pthread_join");
2212 goto error;
fac6795d
DG
2213 }
2214 }
2215
2216 cleanup();
5e16da05 2217 exit(EXIT_SUCCESS);
fac6795d
DG
2218
2219error:
2220 cleanup();
5e16da05 2221 exit(EXIT_FAILURE);
fac6795d 2222}
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