Add channel output method selection
[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
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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>
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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>
31#include <sys/shm.h>
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
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35#include <sys/time.h>
36#include <sys/resource.h>
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37#include <unistd.h>
38
39#include <urcu/list.h> /* URCU list library (-lurcu) */
5b97ec60 40#include <lttng/lttng.h>
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41
42#include "liblttsessiondcomm.h"
43#include "ltt-sessiond.h"
75462a81 44#include "lttngerr.h"
20fe2104 45#include "kernel-ctl.h"
9e78d6ae 46#include "ust-ctl.h"
5b74c7b1 47#include "session.h"
91d76f53 48#include "traceable-app.h"
5dc18550 49#include "lttng-kconsumerd.h"
62d3069f 50#include "libustctl.h"
fac6795d 51
5e16da05
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52/*
53 * TODO:
54 * teardown: signal SIGTERM handler -> write into pipe. Threads waits
55 * with epoll on pipe and on other pipes/sockets for commands. Main
56 * simply waits on pthread join.
57 */
58
75462a81 59/* Const values */
686204ab 60const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 61const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
62const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
63const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
64
fac6795d 65/* Variables */
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66int opt_verbose; /* Not static for lttngerr.h */
67int opt_quiet; /* Not static for lttngerr.h */
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68const char *progname;
69const char *opt_tracing_group;
5b8719f5 70static int opt_sig_parent;
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71static int opt_daemon;
72static int is_root; /* Set to 1 if the daemon is running as root */
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73static pid_t ppid; /* Parent PID for --sig-parent option */
74static pid_t kconsumerd_pid;
fac6795d 75
d6f42150
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76static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
77static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
78static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
79static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
fac6795d 80
1d4b027a 81/* Sockets and FDs */
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82static int client_sock;
83static int apps_sock;
84static int kconsumerd_err_sock;
8c0faa1d 85static int kconsumerd_cmd_sock;
20fe2104 86static int kernel_tracer_fd;
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87
88/* Pthread, Mutexes and Semaphores */
8c0faa1d 89static pthread_t kconsumerd_thread;
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90static pthread_t apps_thread;
91static pthread_t client_thread;
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92static sem_t kconsumerd_sem;
93
1d4b027a 94static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 95
fac6795d 96/*
1d4b027a 97 * teardown_kernel_session
fac6795d 98 *
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99 * Complete teardown of a kernel session. This free all data structure
100 * related to a kernel session and update counter.
fac6795d 101 */
1d4b027a 102static void teardown_kernel_session(struct ltt_session *session)
fac6795d 103{
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104 if (session->kernel_session != NULL) {
105 DBG("Tearing down kernel session");
c363b55d 106 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
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107 /* Extra precaution */
108 session->kernel_session = NULL;
109 /* Decrement session count */
110 session->kern_session_count--;
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{
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121 int ret;
122 char *cmd;
123 struct ltt_session *sess;
fac6795d 124
1d4b027a 125 DBG("Cleaning up");
e07ae692 126
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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
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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
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138 }
139
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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
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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
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151 /* Remove lttng run directory */
152 ret = system(cmd);
153 if (ret < 0) {
154 ERR("Unable to clean " LTTNG_RUNDIR);
155 }
5461b305 156
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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
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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
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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);
285 // TODO: recursive create dir
286 ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
287 if (ret < 0) {
288 if (ret != EEXIST) {
289 perror("mkdir trace path");
290 ret = -errno;
291 goto error;
292 }
293 }
294 }
295
296 return 0;
297
298error:
299 return ret;
300}
301
fac6795d 302/*
471d1693 303 * ust_connect_app
fac6795d
DG
304 *
305 * Return a socket connected to the libust communication socket
306 * of the application identified by the pid.
379473d2
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307 *
308 * If the pid is not found in the traceable list,
309 * return -1 to indicate error.
fac6795d 310 */
471d1693 311static int ust_connect_app(pid_t pid)
fac6795d 312{
91d76f53
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313 int sock;
314 struct ltt_traceable_app *lta;
379473d2 315
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316 DBG("Connect to application pid %d", pid);
317
91d76f53
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318 lta = find_app_by_pid(pid);
319 if (lta == NULL) {
320 /* App not found */
7442b2ba 321 DBG("Application pid %d not found", pid);
379473d2
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322 return -1;
323 }
fac6795d 324
91d76f53 325 sock = ustctl_connect_pid(lta->pid);
fac6795d 326 if (sock < 0) {
62d3069f 327 ERR("Fail connecting to the PID %d", pid);
fac6795d
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328 }
329
330 return sock;
331}
332
333/*
334 * notify_apps
335 *
336 * Notify apps by writing 42 to a named pipe using name.
337 * Every applications waiting for a ltt-sessiond will be notified
338 * and re-register automatically to the session daemon.
339 *
340 * Return open or write error value.
341 */
342static int notify_apps(const char *name)
343{
344 int fd;
345 int ret = -1;
346
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347 DBG("Notify the global application pipe");
348
fac6795d
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349 /* Try opening the global pipe */
350 fd = open(name, O_WRONLY);
351 if (fd < 0) {
352 goto error;
353 }
354
355 /* Notify by writing on the pipe */
356 ret = write(fd, "42", 2);
357 if (ret < 0) {
358 perror("write");
359 }
360
361error:
362 return ret;
363}
364
e065084a 365/*
5461b305 366 * setup_lttng_msg
ca95a216 367 *
5461b305
DG
368 * Setup the outgoing data buffer for the response (llm) by allocating the
369 * right amount of memory and copying the original information from the lsm
370 * structure.
ca95a216
DG
371 *
372 * Return total size of the buffer pointed by buf.
373 */
5461b305 374static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 375{
f3ed775e 376 int ret, buf_size;
ca95a216 377
f3ed775e 378 buf_size = size;
5461b305
DG
379
380 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
381 if (cmd_ctx->llm == NULL) {
ca95a216 382 perror("malloc");
5461b305 383 ret = -ENOMEM;
ca95a216
DG
384 goto error;
385 }
386
5461b305
DG
387 /* Copy common data */
388 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
389 cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
5461b305 390
5461b305
DG
391 cmd_ctx->llm->data_size = size;
392 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
393
ca95a216
DG
394 return buf_size;
395
396error:
397 return ret;
398}
399
1d4b027a
DG
400/*
401 * thread_manage_kconsumerd
402 *
403 * This thread manage the kconsumerd error sent
404 * back to the session daemon.
405 */
406static void *thread_manage_kconsumerd(void *data)
407{
408 int sock, ret;
409 enum lttcomm_return_code code;
410
411 DBG("[thread] Manage kconsumerd started");
412
413 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
414 if (ret < 0) {
415 goto error;
416 }
417
418 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
419 if (sock < 0) {
420 goto error;
421 }
422
712ea556 423 /* Getting status code from kconsumerd */
1d4b027a
DG
424 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
425 if (ret <= 0) {
426 goto error;
427 }
428
429 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
430 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
431 if (kconsumerd_cmd_sock < 0) {
712ea556 432 sem_post(&kconsumerd_sem);
1d4b027a
DG
433 perror("kconsumerd connect");
434 goto error;
435 }
436 /* Signal condition to tell that the kconsumerd is ready */
437 sem_post(&kconsumerd_sem);
438 DBG("Kconsumerd command socket ready");
439 } else {
6f61d021 440 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
441 lttcomm_get_readable_code(-code));
442 goto error;
443 }
444
712ea556
DG
445 /* Wait for any kconsumerd error */
446 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
447 if (ret <= 0) {
448 ERR("Kconsumerd closed the command socket");
449 goto error;
6f61d021 450 }
1d4b027a 451
712ea556
DG
452 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
453
1d4b027a
DG
454error:
455 kconsumerd_pid = 0;
6f61d021 456 DBG("Kconsumerd thread dying");
1d4b027a
DG
457 return NULL;
458}
459
460/*
461 * thread_manage_apps
462 *
463 * This thread manage the application socket communication
464 */
465static void *thread_manage_apps(void *data)
466{
467 int sock, ret;
468
469 /* TODO: Something more elegant is needed but fine for now */
470 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
471 * for 32-bit vs 64-bit compat processes. */
472 /* replicate in ust with version number */
473 struct {
474 int reg; /* 1:register, 0:unregister */
475 pid_t pid;
476 uid_t uid;
477 } reg_msg;
478
479 DBG("[thread] Manage apps started");
480
481 ret = lttcomm_listen_unix_sock(apps_sock);
482 if (ret < 0) {
483 goto error;
484 }
485
486 /* Notify all applications to register */
487 notify_apps(default_global_apps_pipe);
488
489 while (1) {
490 DBG("Accepting application registration");
491 /* Blocking call, waiting for transmission */
492 sock = lttcomm_accept_unix_sock(apps_sock);
493 if (sock < 0) {
494 goto error;
495 }
496
497 /* Basic recv here to handle the very simple data
498 * that the libust send to register (reg_msg).
499 */
500 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
501 if (ret < 0) {
502 perror("recv");
503 continue;
504 }
505
506 /* Add application to the global traceable list */
507 if (reg_msg.reg == 1) {
508 /* Registering */
509 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
510 if (ret < 0) {
511 /* register_traceable_app only return an error with
512 * ENOMEM. At this point, we better stop everything.
513 */
514 goto error;
515 }
516 } else {
517 /* Unregistering */
518 unregister_traceable_app(reg_msg.pid);
519 }
520 }
521
522error:
523
524 return NULL;
525}
526
8c0faa1d 527/*
693bd40b 528 * spawn_kconsumerd_thread
8c0faa1d
DG
529 *
530 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
531 * exec or it will fails.
532 */
693bd40b 533static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
534{
535 int ret;
536
537 /* Setup semaphore */
538 sem_init(&kconsumerd_sem, 0, 0);
539
1d4b027a 540 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
541 if (ret != 0) {
542 perror("pthread_create kconsumerd");
543 goto error;
544 }
545
693bd40b 546 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
547 sem_wait(&kconsumerd_sem);
548
712ea556
DG
549 if (kconsumerd_pid == 0) {
550 ERR("Kconsumerd did not start");
551 goto error;
552 }
553
8c0faa1d
DG
554 return 0;
555
556error:
712ea556 557 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
558 return ret;
559}
560
561/*
693bd40b 562 * spawn_kconsumerd
8c0faa1d 563 *
693bd40b
DG
564 * Fork and exec a kernel consumer daemon (kconsumerd).
565 *
566 * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
567 * file descriptor using the libkernelctl or kernel-ctl functions. So, a
568 * kernel consumer MUST only be spawned before creating a kernel session.
8c0faa1d
DG
569 *
570 * Return pid if successful else -1.
571 */
693bd40b 572static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
573{
574 int ret;
575 pid_t pid;
576
c49dc785
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577 DBG("Spawning kconsumerd");
578
8c0faa1d
DG
579 pid = fork();
580 if (pid == 0) {
581 /*
582 * Exec kconsumerd.
583 */
f57244de 584 execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
8c0faa1d
DG
585 if (errno != 0) {
586 perror("kernel start consumer exec");
587 }
588 exit(EXIT_FAILURE);
589 } else if (pid > 0) {
590 ret = pid;
591 goto error;
592 } else {
593 perror("kernel start consumer fork");
594 ret = -errno;
595 goto error;
596 }
597
598error:
599 return ret;
600}
601
693bd40b
DG
602/*
603 * start_kconsumerd
604 *
605 * Spawn the kconsumerd daemon and session daemon thread.
606 */
607static int start_kconsumerd(void)
608{
609 int ret;
610
693bd40b 611 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785
DG
612 if (kconsumerd_pid != 0) {
613 goto end;
614 }
693bd40b 615
c49dc785
DG
616 ret = spawn_kconsumerd();
617 if (ret < 0) {
618 ERR("Spawning kconsumerd failed");
619 ret = LTTCOMM_KERN_CONSUMER_FAIL;
620 pthread_mutex_unlock(&kconsumerd_pid_mutex);
621 goto error;
693bd40b 622 }
c49dc785
DG
623
624 /* Setting up the global kconsumerd_pid */
625 kconsumerd_pid = ret;
693bd40b
DG
626 pthread_mutex_unlock(&kconsumerd_pid_mutex);
627
6f61d021
DG
628 DBG("Kconsumerd pid %d", ret);
629
693bd40b 630 DBG("Spawning kconsumerd thread");
693bd40b
DG
631 ret = spawn_kconsumerd_thread();
632 if (ret < 0) {
633 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
634 goto error;
635 }
636
c49dc785
DG
637end:
638 pthread_mutex_unlock(&kconsumerd_pid_mutex);
693bd40b
DG
639 return 0;
640
641error:
642 return ret;
643}
644
8c0faa1d 645/*
f3ed775e 646 * init_kernel_tracer
8c0faa1d 647 *
f3ed775e 648 * Setup necessary data for kernel tracer action.
8c0faa1d 649 */
f3ed775e 650static void init_kernel_tracer(void)
8c0faa1d 651{
f3ed775e
DG
652 /* Set the global kernel tracer fd */
653 kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
654 if (kernel_tracer_fd < 0) {
655 WARN("No kernel tracer available");
656 kernel_tracer_fd = 0;
8c0faa1d
DG
657 }
658
f3ed775e
DG
659 DBG("Kernel tracer fd %d", kernel_tracer_fd);
660}
33a2b854 661
f3ed775e
DG
662/*
663 * start_kernel_trace
664 *
665 * Start tracing by creating trace directory and sending FDs to the kernel
666 * consumer.
667 */
668static int start_kernel_trace(struct ltt_kernel_session *session)
669{
670 int ret;
8c0faa1d 671
f3ed775e
DG
672 /* Create trace directory */
673 ret = create_trace_dir(session);
1d4b027a 674 if (ret < 0) {
f3ed775e
DG
675 if (ret == -EEXIST) {
676 ret = LTTCOMM_KERN_DIR_EXIST;
677 } else {
678 ret = LTTCOMM_KERN_DIR_FAIL;
679 goto error;
33a2b854
DG
680 }
681 }
682
f3ed775e
DG
683 if (session->kconsumer_fds_sent == 0) {
684 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
685 if (ret < 0) {
686 ERR("Send kconsumerd fds failed");
687 ret = LTTCOMM_KERN_CONSUMER_FAIL;
688 goto error;
689 }
1d4b027a 690
f3ed775e
DG
691 session->kconsumer_fds_sent = 1;
692 }
1d4b027a
DG
693
694error:
695 return ret;
8c0faa1d
DG
696}
697
698/*
f3ed775e 699 * init_default_channel
8c0faa1d 700 *
f3ed775e 701 * Allocate a channel structure and fill it.
8c0faa1d 702 */
f3ed775e 703static struct lttng_channel *init_default_channel(void)
8c0faa1d 704{
f3ed775e 705 struct lttng_channel *chan;
1d4b027a 706
f3ed775e
DG
707 chan = malloc(sizeof(struct lttng_channel));
708 if (chan == NULL) {
709 perror("init channel malloc");
710 goto error;
8c0faa1d 711 }
1d4b027a 712
f3ed775e
DG
713 if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
714 perror("snprintf defautl channel name");
715 return NULL;
716 }
717
718 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
719 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
720 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
721 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
722 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
b9f1dd69 723 chan->attr.output = DEFAULT_CHANNEL_OUTPUT;
1d4b027a
DG
724
725error:
f3ed775e 726 return chan;
8c0faa1d
DG
727}
728
333f285e 729/*
f3ed775e 730 * create_kernel_session
333f285e 731 *
f3ed775e 732 * Create a kernel tracer session then create the default channel.
333f285e 733 */
f3ed775e 734static int create_kernel_session(struct ltt_session *session)
333f285e 735{
f3ed775e
DG
736 int ret;
737 struct lttng_channel *chan;
738
739 DBG("Creating kernel session");
740
741 ret = kernel_create_session(session, kernel_tracer_fd);
742 if (ret < 0) {
743 ret = LTTCOMM_KERN_SESS_FAIL;
744 goto error;
333f285e
DG
745 }
746
f3ed775e
DG
747 chan = init_default_channel();
748 if (chan == NULL) {
749 ret = LTTCOMM_FATAL;
750 goto error;
751 }
752
753 DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
754
755 ret = kernel_create_channel(session->kernel_session, chan);
756 if (ret < 0) {
757 ret = LTTCOMM_KERN_CHAN_FAIL;
758 goto error;
759 }
760
761error:
762 return ret;
333f285e
DG
763}
764
fac6795d
DG
765/*
766 * process_client_msg
767 *
5461b305
DG
768 * Process the command requested by the lttng client within the command
769 * context structure. This function make sure that the return structure (llm)
770 * is set and ready for transmission before returning.
fac6795d 771 *
e065084a 772 * Return any error encountered or 0 for success.
fac6795d 773 */
5461b305 774static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 775{
5461b305 776 int ret;
fac6795d 777
5461b305 778 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 779
f3ed775e 780 /* Listing commands don't need a session */
5461b305 781 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
782 case LTTNG_CREATE_SESSION:
783 case LTTNG_LIST_SESSIONS:
f3ed775e
DG
784 case LTTNG_LIST_EVENTS:
785 case LTTNG_KERNEL_LIST_EVENTS:
786 case LTTNG_LIST_TRACEABLE_APPS:
5e16da05
MD
787 break;
788 default:
f3ed775e
DG
789 DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
790 cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
5461b305 791 if (cmd_ctx->session == NULL) {
f3ed775e
DG
792 /* If session name not found */
793 if (cmd_ctx->lsm->session_name != NULL) {
794 ret = LTTCOMM_SESS_NOT_FOUND;
795 } else { /* If no session name specified */
796 ret = LTTCOMM_SELECT_SESS;
797 }
5461b305 798 goto error;
379473d2 799 }
5e16da05 800 break;
379473d2
DG
801 }
802
f3ed775e
DG
803 /*
804 * Check kernel command for kernel session.
805 */
20fe2104 806 switch (cmd_ctx->lsm->cmd_type) {
d65106b1 807 case LTTNG_KERNEL_ADD_CONTEXT:
f3ed775e
DG
808 case LTTNG_KERNEL_CREATE_CHANNEL:
809 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
810 case LTTNG_KERNEL_DISABLE_CHANNEL:
811 case LTTNG_KERNEL_DISABLE_EVENT:
812 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
813 case LTTNG_KERNEL_ENABLE_CHANNEL:
814 case LTTNG_KERNEL_ENABLE_EVENT:
815 case LTTNG_KERNEL_LIST_EVENTS:
333f285e 816 /* Kernel tracer check */
20fe2104 817 if (kernel_tracer_fd == 0) {
333f285e
DG
818 init_kernel_tracer();
819 if (kernel_tracer_fd == 0) {
820 ret = LTTCOMM_KERN_NA;
821 goto error;
822 }
20fe2104 823 }
f3ed775e
DG
824
825 /* Need a session for kernel command */
826 if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
827 cmd_ctx->session->kernel_session == NULL) {
7b395890 828
f3ed775e
DG
829 ret = create_kernel_session(cmd_ctx->session);
830 if (ret < 0) {
831 ret = LTTCOMM_KERN_SESS_FAIL;
832 goto error;
833 }
834
7b395890 835 /* Start the kernel consumer daemon */
f3ed775e
DG
836 if (kconsumerd_pid == 0) {
837 ret = start_kconsumerd();
838 if (ret < 0) {
839 goto error;
840 }
841 }
842 }
20fe2104
DG
843 }
844
471d1693 845 /* Connect to ust apps if available pid */
5461b305 846 if (cmd_ctx->lsm->pid > 0) {
471d1693 847 /* Connect to app using ustctl API */
5461b305
DG
848 cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
849 if (cmd_ctx->ust_sock < 0) {
471d1693 850 ret = LTTCOMM_NO_TRACEABLE;
5461b305 851 goto error;
471d1693
DG
852 }
853 }
854
fac6795d 855 /* Process by command type */
5461b305 856 switch (cmd_ctx->lsm->cmd_type) {
d65106b1
DG
857 case LTTNG_KERNEL_ADD_CONTEXT:
858 {
859 int found = 0, no_event = 0;
860 struct ltt_kernel_channel *chan;
861 struct ltt_kernel_event *event;
862
863 /* Setup lttng message with no payload */
864 ret = setup_lttng_msg(cmd_ctx, 0);
865 if (ret < 0) {
866 goto setup_error;
867 }
868
869 /* Check if event name is given */
870 if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
871 no_event = 1;
872 }
873
874 if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
875 /* Go over all channels */
876 DBG("Adding context to all channels");
877 cds_list_for_each_entry(chan,
878 &cmd_ctx->session->kernel_session->channel_list.head, list) {
879 if (no_event) {
880 ret = kernel_add_channel_context(chan,
881 &cmd_ctx->lsm->u.context.ctx);
882 if (ret < 0) {
883 continue;
884 }
885 } else {
886 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
887 if (event != NULL) {
888 ret = kernel_add_event_context(event,
889 &cmd_ctx->lsm->u.context.ctx);
890 if (ret < 0) {
891 ret = LTTCOMM_KERN_CONTEXT_FAIL;
892 goto error;
893 }
894 found = 1;
895 break;
896 }
897 }
898 }
899 } else {
900 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
901 cmd_ctx->session->kernel_session);
902 if (chan == NULL) {
903 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
904 goto error;
905 }
906
907 if (no_event) {
908 ret = kernel_add_channel_context(chan,
909 &cmd_ctx->lsm->u.context.ctx);
910 if (ret < 0) {
911 ret = LTTCOMM_KERN_CONTEXT_FAIL;
912 goto error;
913 }
914 } else {
915 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
916 if (event != NULL) {
917 ret = kernel_add_event_context(event,
918 &cmd_ctx->lsm->u.context.ctx);
919 if (ret < 0) {
920 ret = LTTCOMM_KERN_CONTEXT_FAIL;
921 goto error;
922 }
923 }
924 }
925 }
926
927 if (!found && !no_event) {
928 ret = LTTCOMM_NO_EVENT;
929 goto error;
930 }
931
932 ret = LTTCOMM_OK;
933 break;
934 }
f3ed775e 935 case LTTNG_KERNEL_CREATE_CHANNEL:
20fe2104 936 {
f3ed775e 937 /* Setup lttng message with no payload */
20fe2104
DG
938 ret = setup_lttng_msg(cmd_ctx, 0);
939 if (ret < 0) {
940 goto setup_error;
941 }
942
f3ed775e 943 /* Kernel tracer */
8c0faa1d
DG
944 DBG("Creating kernel channel");
945
f3ed775e
DG
946 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
947 &cmd_ctx->lsm->u.channel.chan);
20fe2104
DG
948 if (ret < 0) {
949 ret = LTTCOMM_KERN_CHAN_FAIL;
950 goto error;
951 }
952
953 ret = LTTCOMM_OK;
954 break;
955 }
26cc6b4e
DG
956 case LTTNG_KERNEL_DISABLE_CHANNEL:
957 {
958 struct ltt_kernel_channel *chan;
959
960 /* Setup lttng message with no payload */
961 ret = setup_lttng_msg(cmd_ctx, 0);
962 if (ret < 0) {
963 goto setup_error;
964 }
965
966 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
967 cmd_ctx->session->kernel_session);
968 if (chan == NULL) {
969 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
970 goto error;
971 } else if (chan->enabled == 1) {
972 ret = kernel_disable_channel(chan);
973 if (ret < 0) {
974 if (ret != EEXIST) {
975 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
976 }
977 goto error;
978 }
979 }
980
981 kernel_wait_quiescent(kernel_tracer_fd);
982 ret = LTTCOMM_OK;
983 break;
984 }
e953ef25
DG
985 case LTTNG_KERNEL_DISABLE_EVENT:
986 {
e953ef25 987 struct ltt_kernel_channel *chan;
19e70852 988 struct ltt_kernel_event *ev;
e953ef25
DG
989
990 /* Setup lttng message with no payload */
991 ret = setup_lttng_msg(cmd_ctx, 0);
992 if (ret < 0) {
993 goto setup_error;
994 }
995
19e70852
DG
996 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
997 cmd_ctx->session->kernel_session);
998 if (chan == NULL) {
999 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1000 goto error;
1001 }
e953ef25 1002
19e70852
DG
1003 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
1004 if (ev != NULL) {
1005 DBG("Disabling kernel event %s for channel %s.",
1006 cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
1007 ret = kernel_disable_event(ev);
1008 if (ret < 0) {
1009 ret = LTTCOMM_KERN_ENABLE_FAIL;
1010 goto error;
e953ef25
DG
1011 }
1012 }
1013
19e70852
DG
1014 kernel_wait_quiescent(kernel_tracer_fd);
1015 ret = LTTCOMM_OK;
e953ef25
DG
1016 break;
1017 }
950131af
DG
1018 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
1019 {
1020 struct ltt_kernel_channel *chan;
1021 struct ltt_kernel_event *ev;
1022
1023 /* Setup lttng message with no payload */
1024 ret = setup_lttng_msg(cmd_ctx, 0);
1025 if (ret < 0) {
1026 goto setup_error;
1027 }
1028
1029 DBG("Disabling all enabled kernel events");
1030
1031 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1032 cmd_ctx->session->kernel_session);
1033 if (chan == NULL) {
1034 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1035 goto error;
1036 }
1037
1038 /* For each event in the kernel session */
1039 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1040 DBG("Disabling kernel event %s for channel %s.",
1041 ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
1042 ret = kernel_disable_event(ev);
1043 if (ret < 0) {
1044 continue;
1045 }
1046 }
1047
1048 /* Quiescent wait after event disable */
1049 kernel_wait_quiescent(kernel_tracer_fd);
1050 ret = LTTCOMM_OK;
1051 break;
1052 }
d36b8583
DG
1053 case LTTNG_KERNEL_ENABLE_CHANNEL:
1054 {
1055 struct ltt_kernel_channel *chan;
1056
1057 /* Setup lttng message with no payload */
1058 ret = setup_lttng_msg(cmd_ctx, 0);
1059 if (ret < 0) {
1060 goto setup_error;
1061 }
1062
1063 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1064 cmd_ctx->session->kernel_session);
1065 if (chan == NULL) {
1066 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1067 goto error;
1068 } else if (chan->enabled == 0) {
1069 ret = kernel_enable_channel(chan);
1070 if (ret < 0) {
1071 if (ret != EEXIST) {
1072 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
1073 }
1074 goto error;
1075 }
1076 }
1077
1078 kernel_wait_quiescent(kernel_tracer_fd);
1079 ret = LTTCOMM_OK;
1080 break;
1081 }
f3ed775e 1082 case LTTNG_KERNEL_ENABLE_EVENT:
894be886 1083 {
f3ed775e 1084 struct ltt_kernel_channel *chan;
19e70852 1085 struct ltt_kernel_event *ev;
f3ed775e 1086
894be886
DG
1087 /* Setup lttng message with no payload */
1088 ret = setup_lttng_msg(cmd_ctx, 0);
1089 if (ret < 0) {
1090 goto setup_error;
1091 }
1092
19e70852
DG
1093 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1094 cmd_ctx->session->kernel_session);
1095 if (chan == NULL) {
1096 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1097 goto error;
f34daff7
DG
1098 }
1099
19e70852
DG
1100 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
1101 if (ev == NULL) {
1102 DBG("Creating kernel event %s for channel %s.",
950131af 1103 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852 1104 ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
f3ed775e 1105 } else {
19e70852 1106 DBG("Enabling kernel event %s for channel %s.",
950131af 1107 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852
DG
1108 ret = kernel_enable_event(ev);
1109 }
1110
1111 if (ret < 0) {
1112 ret = LTTCOMM_KERN_ENABLE_FAIL;
1113 goto error;
f3ed775e 1114 }
19e70852
DG
1115
1116 kernel_wait_quiescent(kernel_tracer_fd);
1117 ret = LTTCOMM_OK;
894be886
DG
1118 break;
1119 }
f3ed775e 1120 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
33a2b854 1121 {
950131af 1122 int pos, size;
33a2b854 1123 char *event_list, *event, *ptr;
f3ed775e 1124 struct ltt_kernel_channel *chan;
950131af
DG
1125 struct ltt_kernel_event *ev;
1126 struct lttng_event ev_attr;
33a2b854
DG
1127
1128 /* Setup lttng message with no payload */
1129 ret = setup_lttng_msg(cmd_ctx, 0);
1130 if (ret < 0) {
1131 goto setup_error;
1132 }
1133
1134 DBG("Enabling all kernel event");
1135
950131af
DG
1136 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1137 cmd_ctx->session->kernel_session);
1138 if (chan == NULL) {
1139 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
33a2b854
DG
1140 goto error;
1141 }
1142
950131af
DG
1143 /* For each event in the kernel session */
1144 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1145 DBG("Enabling kernel event %s for channel %s.",
1146 ev->event->name, chan->channel->name);
1147 ret = kernel_enable_event(ev);
1148 if (ret < 0) {
1149 continue;
f3ed775e
DG
1150 }
1151 }
1152
950131af
DG
1153 size = kernel_list_events(kernel_tracer_fd, &event_list);
1154 if (size < 0) {
1155 ret = LTTCOMM_KERN_LIST_FAIL;
f3ed775e
DG
1156 goto error;
1157 }
1158
33a2b854
DG
1159 ptr = event_list;
1160 while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
950131af
DG
1161 ev = get_kernel_event_by_name(event, chan);
1162 if (ev == NULL) {
1163 strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
1164 /* Default event type for enable all */
1165 ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
1166 /* Enable each single tracepoint event */
1167 ret = kernel_create_event(&ev_attr, chan);
1168 if (ret < 0) {
1169 /* Ignore error here and continue */
950131af 1170 }
33a2b854 1171 }
950131af 1172
33a2b854
DG
1173 /* Move pointer to the next line */
1174 ptr += pos + 1;
1175 free(event);
1176 }
1177
1178 free(event_list);
1179
f3ed775e
DG
1180 /* Quiescent wait after event enable */
1181 kernel_wait_quiescent(kernel_tracer_fd);
33a2b854
DG
1182 ret = LTTCOMM_OK;
1183 break;
1184 }
f3ed775e 1185 case LTTNG_KERNEL_LIST_EVENTS:
2ef84c95
DG
1186 {
1187 char *event_list;
f3ed775e
DG
1188 ssize_t size = 0;
1189
1190 DBG("Listing kernel events");
2ef84c95
DG
1191
1192 size = kernel_list_events(kernel_tracer_fd, &event_list);
1193 if (size < 0) {
1194 ret = LTTCOMM_KERN_LIST_FAIL;
1195 goto error;
1196 }
1197
1198 /*
1199 * Setup lttng message with payload size set to the event list size in
1200 * bytes and then copy list into the llm payload.
1201 */
1202 ret = setup_lttng_msg(cmd_ctx, size);
1203 if (ret < 0) {
1204 goto setup_error;
1205 }
1206
1207 /* Copy event list into message payload */
1208 memcpy(cmd_ctx->llm->payload, event_list, size);
1209
1210 free(event_list);
1211
1212 ret = LTTCOMM_OK;
1213 break;
1214 }
f3ed775e 1215 case LTTNG_START_TRACE:
8c0faa1d
DG
1216 {
1217 struct ltt_kernel_channel *chan;
f3ed775e 1218
8c0faa1d
DG
1219 /* Setup lttng message with no payload */
1220 ret = setup_lttng_msg(cmd_ctx, 0);
1221 if (ret < 0) {
1222 goto setup_error;
1223 }
1224
f3ed775e
DG
1225 /* Kernel tracing */
1226 if (cmd_ctx->session->kernel_session != NULL) {
1227 if (cmd_ctx->session->kernel_session->metadata == NULL) {
1228 DBG("Open kernel metadata");
1229 ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
1230 if (ret < 0) {
1231 ret = LTTCOMM_KERN_META_FAIL;
1232 goto error;
1233 }
1234 }
8c0faa1d 1235
f3ed775e
DG
1236 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1237 DBG("Opening kernel metadata stream");
1238 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1239 ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
1240 if (ret < 0) {
1241 ERR("Kernel create metadata stream failed");
1242 ret = LTTCOMM_KERN_STREAM_FAIL;
1243 goto error;
1244 }
1245 }
1246 }
8c0faa1d 1247
f3ed775e
DG
1248 /* For each channel */
1249 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
1250 if (chan->stream_count == 0) {
1251 ret = kernel_open_channel_stream(chan);
1252 if (ret < 0) {
1253 ERR("Kernel create channel stream failed");
1254 ret = LTTCOMM_KERN_STREAM_FAIL;
1255 goto error;
1256 }
1257 /* Update the stream global counter */
1258 cmd_ctx->session->kernel_session->stream_count_global += ret;
1259 }
1260 }
1261
1262 DBG("Start kernel tracing");
1263 ret = kernel_start_session(cmd_ctx->session->kernel_session);
8c0faa1d 1264 if (ret < 0) {
f3ed775e
DG
1265 ERR("Kernel start session failed");
1266 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1267 goto error;
1268 }
8c0faa1d 1269
f3ed775e
DG
1270 ret = start_kernel_trace(cmd_ctx->session->kernel_session);
1271 if (ret < 0) {
1272 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1273 goto error;
1274 }
8c0faa1d 1275
f3ed775e
DG
1276 /* Quiescent wait after starting trace */
1277 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1278 }
1279
f3ed775e 1280 /* TODO: Start all UST traces */
8c0faa1d
DG
1281
1282 ret = LTTCOMM_OK;
1283 break;
1284 }
f3ed775e 1285 case LTTNG_STOP_TRACE:
8c0faa1d 1286 {
f3ed775e 1287 struct ltt_kernel_channel *chan;
8c0faa1d
DG
1288 /* Setup lttng message with no payload */
1289 ret = setup_lttng_msg(cmd_ctx, 0);
1290 if (ret < 0) {
1291 goto setup_error;
1292 }
1293
f3ed775e
DG
1294 /* Kernel tracer */
1295 if (cmd_ctx->session->kernel_session != NULL) {
1296 DBG("Stop kernel tracing");
84291629 1297
f3ed775e
DG
1298 ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
1299 if (ret < 0) {
1300 ERR("Kernel metadata flush failed");
1301 }
8c0faa1d 1302
f3ed775e
DG
1303 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
1304 ret = kernel_flush_buffer(chan);
1305 if (ret < 0) {
1306 ERR("Kernel flush buffer error");
1307 }
1308 }
1309
1310 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
1311 if (ret < 0) {
1312 ERR("Kernel stop session failed");
1313 ret = LTTCOMM_KERN_STOP_FAIL;
1314 goto error;
1315 }
1316
1317 /* Quiescent wait after stopping trace */
1318 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1319 }
1320
f3ed775e 1321 /* TODO : User-space tracer */
8c0faa1d
DG
1322
1323 ret = LTTCOMM_OK;
1324 break;
1325 }
5e16da05
MD
1326 case LTTNG_CREATE_SESSION:
1327 {
5461b305
DG
1328 /* Setup lttng message with no payload */
1329 ret = setup_lttng_msg(cmd_ctx, 0);
1330 if (ret < 0) {
1331 goto setup_error;
1332 }
1333
f3ed775e 1334 ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path);
5e16da05 1335 if (ret < 0) {
f3ed775e 1336 if (ret == -EEXIST) {
5e16da05
MD
1337 ret = LTTCOMM_EXIST_SESS;
1338 } else {
aaf97519 1339 ret = LTTCOMM_FATAL;
aaf97519 1340 }
5461b305 1341 goto error;
8028d920 1342 }
1657e9bb 1343
5461b305 1344 ret = LTTCOMM_OK;
5e16da05
MD
1345 break;
1346 }
1347 case LTTNG_DESTROY_SESSION:
1348 {
5461b305
DG
1349 /* Setup lttng message with no payload */
1350 ret = setup_lttng_msg(cmd_ctx, 0);
1351 if (ret < 0) {
1352 goto setup_error;
1353 }
1354
f3ed775e
DG
1355 /* Clean kernel session teardown */
1356 teardown_kernel_session(cmd_ctx->session);
1357
1358 ret = destroy_session(cmd_ctx->lsm->session_name);
5e16da05 1359 if (ret < 0) {
f3ed775e 1360 ret = LTTCOMM_FATAL;
5461b305 1361 goto error;
5e16da05 1362 }
1657e9bb 1363
5461b305
DG
1364 ret = LTTCOMM_OK;
1365 break;
5e16da05 1366 }
f3ed775e 1367 /*
5e16da05
MD
1368 case LTTNG_LIST_TRACES:
1369 {
5461b305 1370 unsigned int trace_count;
1657e9bb 1371
5461b305 1372 trace_count = get_trace_count_per_session(cmd_ctx->session);
5e16da05
MD
1373 if (trace_count == 0) {
1374 ret = LTTCOMM_NO_TRACE;
5461b305 1375 goto error;
1657e9bb 1376 }
df0da139 1377
5461b305
DG
1378 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
1379 if (ret < 0) {
1380 goto setup_error;
df0da139 1381 }
ca95a216 1382
5461b305
DG
1383 get_traces_per_session(cmd_ctx->session,
1384 (struct lttng_trace *)(cmd_ctx->llm->payload));
1385
1386 ret = LTTCOMM_OK;
5e16da05
MD
1387 break;
1388 }
f3ed775e
DG
1389 */
1390 /*
5e16da05
MD
1391 case UST_CREATE_TRACE:
1392 {
5461b305 1393 ret = setup_lttng_msg(cmd_ctx, 0);
5e16da05 1394 if (ret < 0) {
5461b305 1395 goto setup_error;
fac6795d 1396 }
ce3d728c 1397
5461b305
DG
1398 ret = ust_create_trace(cmd_ctx);
1399 if (ret < 0) {
f3ed775e 1400 goto error;
5461b305
DG
1401 }
1402 break;
5e16da05 1403 }
f3ed775e
DG
1404 */
1405 case LTTNG_LIST_TRACEABLE_APPS:
5e16da05 1406 {
5461b305
DG
1407 unsigned int app_count;
1408
1409 app_count = get_app_count();
1410 DBG("Traceable application count : %d", app_count);
5e16da05
MD
1411 if (app_count == 0) {
1412 ret = LTTCOMM_NO_APPS;
5461b305 1413 goto error;
ce3d728c 1414 }
520ff687 1415
5461b305
DG
1416 ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
1417 if (ret < 0) {
1418 goto setup_error;
520ff687 1419 }
57167058 1420
5461b305 1421 get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
5e16da05 1422
5461b305 1423 ret = LTTCOMM_OK;
5e16da05
MD
1424 break;
1425 }
f3ed775e 1426 /*
5e16da05
MD
1427 case UST_START_TRACE:
1428 {
5461b305
DG
1429 ret = setup_lttng_msg(cmd_ctx, 0);
1430 if (ret < 0) {
1431 goto setup_error;
1432 }
ca95a216 1433
5461b305
DG
1434 ret = ust_start_trace(cmd_ctx);
1435 if (ret < 0) {
1436 goto setup_error;
1437 }
1438 break;
5e16da05
MD
1439 }
1440 case UST_STOP_TRACE:
1441 {
5461b305
DG
1442 ret = setup_lttng_msg(cmd_ctx, 0);
1443 if (ret < 0) {
1444 goto setup_error;
1445 }
ca95a216 1446
5461b305
DG
1447 ret = ust_stop_trace(cmd_ctx);
1448 if (ret < 0) {
1449 goto setup_error;
1450 }
1451 break;
5e16da05 1452 }
f3ed775e 1453 */
5e16da05
MD
1454 case LTTNG_LIST_SESSIONS:
1455 {
5461b305
DG
1456 unsigned int session_count;
1457
1458 session_count = get_session_count();
5e16da05 1459 if (session_count == 0) {
f3ed775e 1460 ret = LTTCOMM_NO_SESSION;
5461b305 1461 goto error;
57167058 1462 }
5e16da05 1463
5461b305
DG
1464 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
1465 if (ret < 0) {
1466 goto setup_error;
e065084a 1467 }
5e16da05 1468
5461b305 1469 get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
5e16da05 1470
5461b305 1471 ret = LTTCOMM_OK;
5e16da05
MD
1472 break;
1473 }
1474 default:
1475 /* Undefined command */
5461b305
DG
1476 ret = setup_lttng_msg(cmd_ctx, 0);
1477 if (ret < 0) {
1478 goto setup_error;
1479 }
1480
5e16da05 1481 ret = LTTCOMM_UND;
5461b305 1482 break;
fac6795d
DG
1483 }
1484
5461b305
DG
1485 /* Set return code */
1486 cmd_ctx->llm->ret_code = ret;
ca95a216 1487
e065084a
DG
1488 return ret;
1489
5461b305 1490error:
5461b305
DG
1491 if (cmd_ctx->llm == NULL) {
1492 DBG("Missing llm structure. Allocating one.");
894be886 1493 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
1494 goto setup_error;
1495 }
1496 }
e065084a 1497 /* Notify client of error */
5461b305 1498 cmd_ctx->llm->ret_code = ret;
e065084a 1499
5461b305 1500setup_error:
8028d920 1501 return ret;
fac6795d
DG
1502}
1503
1d4b027a
DG
1504/*
1505 * thread_manage_clients
1506 *
1507 * This thread manage all clients request using the unix
1508 * client socket for communication.
1509 */
1510static void *thread_manage_clients(void *data)
1511{
1512 int sock, ret;
1513 struct command_ctx *cmd_ctx;
1514
1515 DBG("[thread] Manage client started");
1516
1517 ret = lttcomm_listen_unix_sock(client_sock);
1518 if (ret < 0) {
1519 goto error;
1520 }
1521
1522 /* Notify parent pid that we are ready
1523 * to accept command for client side.
1524 */
1525 if (opt_sig_parent) {
1526 kill(ppid, SIGCHLD);
1527 }
1528
1529 while (1) {
1530 /* Blocking call, waiting for transmission */
1531 DBG("Accepting client command ...");
1532 sock = lttcomm_accept_unix_sock(client_sock);
1533 if (sock < 0) {
1534 goto error;
1535 }
1536
1537 /* Allocate context command to process the client request */
1538 cmd_ctx = malloc(sizeof(struct command_ctx));
1539
1540 /* Allocate data buffer for reception */
1541 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
1542 cmd_ctx->llm = NULL;
1543 cmd_ctx->session = NULL;
1544
1545 /*
1546 * Data is received from the lttng client. The struct
1547 * lttcomm_session_msg (lsm) contains the command and data request of
1548 * the client.
1549 */
1550 DBG("Receiving data from client ...");
1551 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
1552 if (ret <= 0) {
1553 continue;
1554 }
1555
f7776ea7
DG
1556 // TODO: Validate cmd_ctx including sanity check for security purpose.
1557
1d4b027a
DG
1558 /*
1559 * This function dispatch the work to the kernel or userspace tracer
1560 * libs and fill the lttcomm_lttng_msg data structure of all the needed
1561 * informations for the client. The command context struct contains
1562 * everything this function may needs.
1563 */
1564 ret = process_client_msg(cmd_ctx);
1565 if (ret < 0) {
1566 /* TODO: Inform client somehow of the fatal error. At this point,
1567 * ret < 0 means that a malloc failed (ENOMEM). */
1568 /* Error detected but still accept command */
1569 clean_command_ctx(cmd_ctx);
1570 continue;
1571 }
1572
1573 DBG("Sending response (size: %d, retcode: %d)",
1574 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
1575 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1576 if (ret < 0) {
1577 ERR("Failed to send data back to client");
1578 }
1579
1580 clean_command_ctx(cmd_ctx);
d6e4fca4
DG
1581
1582 /* End of transmission */
1583 close(sock);
1d4b027a
DG
1584 }
1585
1586error:
1587 return NULL;
1588}
1589
1590
fac6795d
DG
1591/*
1592 * usage function on stderr
1593 */
1594static void usage(void)
1595{
b716ce68 1596 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
1597 fprintf(stderr, " -h, --help Display this usage.\n");
1598 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
1599 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
1600 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
1601 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
1602 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
1603 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
1604 fprintf(stderr, " -V, --version Show version number.\n");
1605 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
1606 fprintf(stderr, " -q, --quiet No output at all.\n");
1607 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
fac6795d
DG
1608}
1609
1610/*
1611 * daemon argument parsing
1612 */
1613static int parse_args(int argc, char **argv)
1614{
1615 int c;
1616
1617 static struct option long_options[] = {
1618 { "client-sock", 1, 0, 'c' },
1619 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
1620 { "kconsumerd-cmd-sock", 1, 0, 0 },
1621 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 1622 { "daemonize", 0, 0, 'd' },
5b8719f5 1623 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
1624 { "help", 0, 0, 'h' },
1625 { "group", 1, 0, 'g' },
1626 { "version", 0, 0, 'V' },
75462a81 1627 { "quiet", 0, 0, 'q' },
3f9947db 1628 { "verbose", 0, 0, 'v' },
fac6795d
DG
1629 { NULL, 0, 0, 0 }
1630 };
1631
1632 while (1) {
1633 int option_index = 0;
d6f42150 1634 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index);
fac6795d
DG
1635 if (c == -1) {
1636 break;
1637 }
1638
1639 switch (c) {
1640 case 0:
1641 fprintf(stderr, "option %s", long_options[option_index].name);
1642 if (optarg) {
1643 fprintf(stderr, " with arg %s\n", optarg);
1644 }
1645 break;
b716ce68 1646 case 'c':
fac6795d
DG
1647 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
1648 break;
1649 case 'a':
1650 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
1651 break;
1652 case 'd':
1653 opt_daemon = 1;
1654 break;
1655 case 'g':
1656 opt_tracing_group = strdup(optarg);
1657 break;
1658 case 'h':
1659 usage();
1660 exit(EXIT_FAILURE);
1661 case 'V':
1662 fprintf(stdout, "%s\n", VERSION);
1663 exit(EXIT_SUCCESS);
5b8719f5
DG
1664 case 'S':
1665 opt_sig_parent = 1;
1666 break;
d6f42150
DG
1667 case 'E':
1668 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
1669 break;
1670 case 'C':
1671 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
1672 break;
75462a81
DG
1673 case 'q':
1674 opt_quiet = 1;
1675 break;
3f9947db
DG
1676 case 'v':
1677 opt_verbose = 1;
1678 break;
fac6795d
DG
1679 default:
1680 /* Unknown option or other error.
1681 * Error is printed by getopt, just return */
1682 return -1;
1683 }
1684 }
1685
1686 return 0;
1687}
1688
1689/*
1690 * init_daemon_socket
1691 *
1692 * Creates the two needed socket by the daemon.
d6f42150
DG
1693 * apps_sock - The communication socket for all UST apps.
1694 * client_sock - The communication of the cli tool (lttng).
fac6795d
DG
1695 */
1696static int init_daemon_socket()
1697{
1698 int ret = 0;
1699 mode_t old_umask;
1700
1701 old_umask = umask(0);
1702
1703 /* Create client tool unix socket */
d6f42150
DG
1704 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
1705 if (client_sock < 0) {
1706 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
1707 ret = -1;
1708 goto end;
1709 }
1710
1711 /* File permission MUST be 660 */
1712 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1713 if (ret < 0) {
d6f42150 1714 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
1715 perror("chmod");
1716 goto end;
1717 }
1718
1719 /* Create the application unix socket */
d6f42150
DG
1720 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
1721 if (apps_sock < 0) {
1722 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
1723 ret = -1;
1724 goto end;
1725 }
1726
d6f42150 1727 /* File permission MUST be 666 */
fac6795d
DG
1728 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1729 if (ret < 0) {
d6f42150 1730 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
1731 perror("chmod");
1732 goto end;
1733 }
1734
1735end:
1736 umask(old_umask);
1737 return ret;
1738}
1739
1740/*
1741 * check_existing_daemon
1742 *
1743 * Check if the global socket is available.
62bd06d8 1744 * If yes, error is returned.
fac6795d
DG
1745 */
1746static int check_existing_daemon()
1747{
1748 int ret;
1749
1750 ret = access(client_unix_sock_path, F_OK);
1751 if (ret == 0) {
1752 ret = access(apps_unix_sock_path, F_OK);
1753 }
1754
1755 return ret;
1756}
1757
1758/*
62bd06d8 1759 * get_home_dir
fac6795d 1760 *
62bd06d8
DG
1761 * Return pointer to home directory path using
1762 * the env variable HOME.
fac6795d 1763 *
62bd06d8 1764 * Default : /tmp
fac6795d
DG
1765 */
1766static const char *get_home_dir(void)
1767{
1768 const char *home_path;
1769
686204ab 1770 if ((home_path = (const char *) getenv("HOME")) == NULL) {
fac6795d
DG
1771 home_path = default_home_dir;
1772 }
1773
1774 return home_path;
1775}
1776
1777/*
d6f42150 1778 * set_permissions
fac6795d 1779 *
5e16da05
MD
1780 * Set the tracing group gid onto the client socket.
1781 *
1782 * Race window between mkdir and chown is OK because we are going from
1783 * less permissive (root.root) to more permissive (root.tracing).
fac6795d 1784 */
d6f42150 1785static int set_permissions(void)
fac6795d
DG
1786{
1787 int ret;
1788 struct group *grp;
1789
1790 /* Decide which group name to use */
1791 (opt_tracing_group != NULL) ?
1792 (grp = getgrnam(opt_tracing_group)) :
1793 (grp = getgrnam(default_tracing_group));
1794
1795 if (grp == NULL) {
75462a81 1796 ERR("Missing tracing group. Aborting execution.\n");
fac6795d
DG
1797 ret = -1;
1798 goto end;
1799 }
1800
d6f42150
DG
1801 /* Set lttng run dir */
1802 ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
1803 if (ret < 0) {
1804 ERR("Unable to set group on " LTTNG_RUNDIR);
1805 perror("chown");
1806 }
1807
1808 /* lttng client socket path */
fac6795d
DG
1809 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
1810 if (ret < 0) {
d6f42150
DG
1811 ERR("Unable to set group on %s", client_unix_sock_path);
1812 perror("chown");
1813 }
1814
1815 /* kconsumerd error socket path */
1816 ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
1817 if (ret < 0) {
1818 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
1819 perror("chown");
1820 }
1821
d6f42150 1822 DBG("All permissions are set");
e07ae692 1823
fac6795d
DG
1824end:
1825 return ret;
1826}
1827
d6f42150
DG
1828/*
1829 * create_lttng_rundir
1830 *
1831 * Create the lttng run directory needed for all
1832 * global sockets and pipe.
1833 */
1834static int create_lttng_rundir(void)
1835{
1836 int ret;
1837
1838 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
1839 if (ret < 0) {
b1f11e69
DG
1840 if (errno != EEXIST) {
1841 ERR("Unable to create " LTTNG_RUNDIR);
1842 goto error;
1843 } else {
1844 ret = 0;
1845 }
d6f42150
DG
1846 }
1847
1848error:
1849 return ret;
1850}
1851
1852/*
1853 * set_kconsumerd_sockets
1854 *
1855 * Setup sockets and directory needed by the kconsumerd
1856 * communication with the session daemon.
1857 */
1858static int set_kconsumerd_sockets(void)
1859{
1860 int ret;
1861
1862 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
1863 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
1864 }
1865
1866 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
1867 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
1868 }
1869
1870 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
1871 if (ret < 0) {
6beb2242
DG
1872 if (errno != EEXIST) {
1873 ERR("Failed to create " KCONSUMERD_PATH);
1874 goto error;
1875 }
1876 ret = 0;
d6f42150
DG
1877 }
1878
1879 /* Create the kconsumerd error unix socket */
1880 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
1881 if (kconsumerd_err_sock < 0) {
1882 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
1883 ret = -1;
1884 goto error;
1885 }
1886
1887 /* File permission MUST be 660 */
1888 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1889 if (ret < 0) {
1890 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
1891 perror("chmod");
1892 goto error;
1893 }
1894
1895error:
1896 return ret;
1897}
1898
fac6795d 1899/*
62bd06d8 1900 * sighandler
fac6795d 1901 *
62bd06d8 1902 * Signal handler for the daemon
fac6795d
DG
1903 */
1904static void sighandler(int sig)
1905{
1906 switch (sig) {
1907 case SIGPIPE:
e07ae692 1908 DBG("SIGPIPE catched");
87378cf5 1909 return;
fac6795d 1910 case SIGINT:
e07ae692
DG
1911 DBG("SIGINT catched");
1912 cleanup();
1913 break;
fac6795d 1914 case SIGTERM:
e07ae692 1915 DBG("SIGTERM catched");
fac6795d 1916 cleanup();
686204ab 1917 break;
fac6795d
DG
1918 default:
1919 break;
1920 }
1921
1922 exit(EXIT_SUCCESS);
1923}
1924
1925/*
1d4b027a 1926 * set_signal_handler
fac6795d 1927 *
1d4b027a
DG
1928 * Setup signal handler for :
1929 * SIGINT, SIGTERM, SIGPIPE
fac6795d 1930 */
1d4b027a 1931static int set_signal_handler(void)
fac6795d 1932{
1d4b027a
DG
1933 int ret = 0;
1934 struct sigaction sa;
1935 sigset_t sigset;
fac6795d 1936
1d4b027a
DG
1937 if ((ret = sigemptyset(&sigset)) < 0) {
1938 perror("sigemptyset");
1939 return ret;
1940 }
d6f42150 1941
1d4b027a
DG
1942 sa.sa_handler = sighandler;
1943 sa.sa_mask = sigset;
1944 sa.sa_flags = 0;
1945 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
1946 perror("sigaction");
1947 return ret;
d6f42150
DG
1948 }
1949
1d4b027a
DG
1950 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
1951 perror("sigaction");
1952 return ret;
d6f42150 1953 }
aaf26714 1954
1d4b027a
DG
1955 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
1956 perror("sigaction");
1957 return ret;
8c0faa1d
DG
1958 }
1959
1d4b027a
DG
1960 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
1961
1962 return ret;
fac6795d
DG
1963}
1964
f3ed775e
DG
1965/*
1966 * set_ulimit
1967 *
1968 * Set open files limit to unlimited. This daemon can open a large number of
1969 * file descriptors in order to consumer multiple kernel traces.
1970 */
1971static void set_ulimit(void)
1972{
1973 int ret;
1974 struct rlimit lim;
1975
1976 lim.rlim_cur = 65535;
1977 lim.rlim_max = 65535;
1978
1979 ret = setrlimit(RLIMIT_NOFILE, &lim);
1980 if (ret < 0) {
1981 perror("failed to set open files limit");
1982 }
1983}
1984
fac6795d
DG
1985/*
1986 * main
1987 */
1988int main(int argc, char **argv)
1989{
fac6795d
DG
1990 int ret = 0;
1991 void *status;
fac6795d
DG
1992
1993 /* Parse arguments */
1994 progname = argv[0];
1995 if ((ret = parse_args(argc, argv) < 0)) {
1996 goto error;
1997 }
1998
1999 /* Daemonize */
2000 if (opt_daemon) {
53094c05
DG
2001 ret = daemon(0, 0);
2002 if (ret < 0) {
2003 perror("daemon");
2004 goto error;
2005 }
fac6795d
DG
2006 }
2007
2008 /* Check if daemon is UID = 0 */
2009 is_root = !getuid();
2010
2011 /* Set all sockets path */
2012 if (is_root) {
d6f42150
DG
2013 ret = create_lttng_rundir();
2014 if (ret < 0) {
2015 goto error;
2016 }
2017
fac6795d 2018 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2019 snprintf(apps_unix_sock_path, PATH_MAX,
2020 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
2021 }
2022
2023 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2024 snprintf(client_unix_sock_path, PATH_MAX,
2025 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
2026 }
2027
2028 ret = set_kconsumerd_sockets();
2029 if (ret < 0) {
2030 goto error;
fac6795d 2031 }
20fe2104
DG
2032
2033 /* Setup kernel tracer */
2034 init_kernel_tracer();
f3ed775e
DG
2035
2036 /* Set ulimit for open files */
2037 set_ulimit();
fac6795d
DG
2038 } else {
2039 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2040 snprintf(apps_unix_sock_path, PATH_MAX,
2041 DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir());
fac6795d
DG
2042 }
2043
2044 /* Set the cli tool unix socket path */
2045 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2046 snprintf(client_unix_sock_path, PATH_MAX,
2047 DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir());
fac6795d
DG
2048 }
2049 }
2050
847177cd
DG
2051 DBG("Client socket path %s", client_unix_sock_path);
2052 DBG("Application socket path %s", apps_unix_sock_path);
2053
fac6795d
DG
2054 /* See if daemon already exist. If any of the two
2055 * socket needed by the daemon are present, this test fails
2056 */
2057 if ((ret = check_existing_daemon()) == 0) {
75462a81 2058 ERR("Already running daemon.\n");
ab118b20 2059 /* We do not goto error because we must not
d6f42150 2060 * cleanup() because a daemon is already running.
ab118b20 2061 */
5e16da05 2062 exit(EXIT_FAILURE);
fac6795d
DG
2063 }
2064
2065 if (set_signal_handler() < 0) {
2066 goto error;
2067 }
2068
d6f42150 2069 /* Setup the needed unix socket */
fac6795d
DG
2070 if (init_daemon_socket() < 0) {
2071 goto error;
2072 }
2073
2074 /* Set credentials to socket */
d6f42150 2075 if (is_root && (set_permissions() < 0)) {
fac6795d
DG
2076 goto error;
2077 }
2078
5b8719f5
DG
2079 /* Get parent pid if -S, --sig-parent is specified. */
2080 if (opt_sig_parent) {
2081 ppid = getppid();
2082 }
2083
fac6795d
DG
2084 while (1) {
2085 /* Create thread to manage the client socket */
1d4b027a 2086 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
fac6795d
DG
2087 if (ret != 0) {
2088 perror("pthread_create");
2089 goto error;
2090 }
2091
2092 /* Create thread to manage application socket */
1d4b027a 2093 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
fac6795d
DG
2094 if (ret != 0) {
2095 perror("pthread_create");
2096 goto error;
2097 }
2098
1d4b027a
DG
2099 ret = pthread_join(client_thread, &status);
2100 if (ret != 0) {
2101 perror("pthread_join");
2102 goto error;
fac6795d
DG
2103 }
2104 }
2105
2106 cleanup();
5e16da05 2107 exit(EXIT_SUCCESS);
fac6795d
DG
2108
2109error:
2110 cleanup();
5e16da05 2111 exit(EXIT_FAILURE);
fac6795d 2112}
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