Change configuration file and trace output dir
[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>
f3ed775e
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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"
8e68d1c8 51#include "utils.h"
fac6795d 52
5e16da05
MD
53/*
54 * TODO:
55 * teardown: signal SIGTERM handler -> write into pipe. Threads waits
56 * with epoll on pipe and on other pipes/sockets for commands. Main
57 * simply waits on pthread join.
58 */
59
75462a81 60/* Const values */
686204ab 61const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 62const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
63const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
64const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
65
fac6795d 66/* Variables */
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67int opt_verbose; /* Not static for lttngerr.h */
68int opt_quiet; /* Not static for lttngerr.h */
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69const char *progname;
70const char *opt_tracing_group;
5b8719f5 71static int opt_sig_parent;
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72static int opt_daemon;
73static int is_root; /* Set to 1 if the daemon is running as root */
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74static pid_t ppid; /* Parent PID for --sig-parent option */
75static pid_t kconsumerd_pid;
fac6795d 76
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77static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
78static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
79static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
80static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
fac6795d 81
1d4b027a 82/* Sockets and FDs */
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83static int client_sock;
84static int apps_sock;
85static int kconsumerd_err_sock;
8c0faa1d 86static int kconsumerd_cmd_sock;
20fe2104 87static int kernel_tracer_fd;
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88
89/* Pthread, Mutexes and Semaphores */
8c0faa1d 90static pthread_t kconsumerd_thread;
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91static pthread_t apps_thread;
92static pthread_t client_thread;
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93static sem_t kconsumerd_sem;
94
1d4b027a 95static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 96
fac6795d 97/*
1d4b027a 98 * teardown_kernel_session
fac6795d 99 *
1d4b027a
DG
100 * Complete teardown of a kernel session. This free all data structure
101 * related to a kernel session and update counter.
fac6795d 102 */
1d4b027a 103static void teardown_kernel_session(struct ltt_session *session)
fac6795d 104{
1d4b027a
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105 if (session->kernel_session != NULL) {
106 DBG("Tearing down kernel session");
c363b55d 107 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
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108 /* Extra precaution */
109 session->kernel_session = NULL;
110 /* Decrement session count */
111 session->kern_session_count--;
fac6795d 112 }
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113}
114
115/*
1d4b027a 116 * cleanup
fac6795d 117 *
1d4b027a 118 * Cleanup the daemon on exit
fac6795d 119 */
1d4b027a 120static void cleanup()
fac6795d 121{
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122 int ret;
123 char *cmd;
124 struct ltt_session *sess;
fac6795d 125
1d4b027a 126 DBG("Cleaning up");
e07ae692 127
1d4b027a
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128 /* <fun> */
129 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
130 MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
131 /* </fun> */
fac6795d 132
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133 /* Stopping all threads */
134 DBG("Terminating all threads");
135 pthread_cancel(client_thread);
136 pthread_cancel(apps_thread);
137 if (kconsumerd_pid != 0) {
138 pthread_cancel(kconsumerd_thread);
5b8719f5
DG
139 }
140
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DG
141 DBG("Unlinking all unix socket");
142 unlink(client_unix_sock_path);
143 unlink(apps_unix_sock_path);
144 unlink(kconsumerd_err_unix_sock_path);
fac6795d 145
1d4b027a
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146 DBG("Removing %s directory", LTTNG_RUNDIR);
147 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
148 if (ret < 0) {
149 ERR("asprintf failed. Something is really wrong!");
150 }
5461b305 151
1d4b027a
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152 /* Remove lttng run directory */
153 ret = system(cmd);
154 if (ret < 0) {
155 ERR("Unable to clean " LTTNG_RUNDIR);
156 }
5461b305 157
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158 DBG("Cleaning up all session");
159 /* Cleanup ALL session */
160 cds_list_for_each_entry(sess, &ltt_session_list.head, list) {
161 teardown_kernel_session(sess);
162 // TODO complete session cleanup (including UST)
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163 }
164
f3ed775e 165 DBG("Closing kernel fd");
1d4b027a 166 close(kernel_tracer_fd);
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167}
168
e065084a
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169/*
170 * send_unix_sock
171 *
172 * Send data on a unix socket using the liblttsessiondcomm API.
173 *
174 * Return lttcomm error code.
175 */
176static int send_unix_sock(int sock, void *buf, size_t len)
177{
178 /* Check valid length */
179 if (len <= 0) {
180 return -1;
181 }
182
183 return lttcomm_send_unix_sock(sock, buf, len);
184}
185
5461b305
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186/*
187 * clean_command_ctx
188 *
189 * Free memory of a command context structure.
190 */
191static void clean_command_ctx(struct command_ctx *cmd_ctx)
192{
193 DBG("Clean command context structure %p", cmd_ctx);
194 if (cmd_ctx) {
195 if (cmd_ctx->llm) {
196 free(cmd_ctx->llm);
197 }
198 if (cmd_ctx->lsm) {
199 free(cmd_ctx->lsm);
200 }
201 free(cmd_ctx);
202 cmd_ctx = NULL;
203 }
204}
205
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206/*
207 * send_kconsumerd_fds
208 *
209 * Send all stream fds of the kernel session to the consumer.
210 */
211static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
212{
213 int ret;
214 size_t nb_fd;
215 struct ltt_kernel_stream *stream;
216 struct ltt_kernel_channel *chan;
217 struct lttcomm_kconsumerd_header lkh;
218 struct lttcomm_kconsumerd_msg lkm;
219
220 nb_fd = session->stream_count_global;
221
222 /* Setup header */
223 lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
224 lkh.cmd_type = ADD_STREAM;
225
226 DBG("Sending kconsumerd header");
227
228 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
229 if (ret < 0) {
230 perror("send kconsumerd header");
231 goto error;
232 }
233
234 DBG("Sending metadata stream fd");
235
236 /* Send metadata stream fd first */
237 lkm.fd = session->metadata_stream_fd;
238 lkm.state = ACTIVE_FD;
239 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
240 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
241
242 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
243 if (ret < 0) {
244 perror("send kconsumerd fd");
245 goto error;
246 }
247
248 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
249 cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
250 lkm.fd = stream->fd;
251 lkm.state = stream->state;
252 lkm.max_sb_size = chan->channel->attr.subbuf_size;
253 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
254
255 DBG("Sending fd %d to kconsumerd", lkm.fd);
256
257 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
258 if (ret < 0) {
259 perror("send kconsumerd fd");
260 goto error;
261 }
262 }
263 }
264
265 DBG("Kconsumerd fds sent");
266
267 return 0;
268
269error:
270 return ret;
271}
272
273/*
274 * create_trace_dir
275 *
276 * Create the trace output directory.
277 */
278static int create_trace_dir(struct ltt_kernel_session *session)
279{
280 int ret;
281 struct ltt_kernel_channel *chan;
282
283 /* Create all channel directories */
284 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
285 DBG("Creating trace directory at %s", chan->pathname);
8e68d1c8 286 ret = mkdir_recursive(chan->pathname, S_IRWXU | S_IRWXG );
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287 if (ret < 0) {
288 if (ret != EEXIST) {
8e68d1c8 289 ERR("Trace directory creation error");
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290 goto error;
291 }
292 }
293 }
294
295 return 0;
296
297error:
298 return ret;
299}
300
fac6795d 301/*
471d1693 302 * ust_connect_app
fac6795d
DG
303 *
304 * Return a socket connected to the libust communication socket
305 * of the application identified by the pid.
379473d2
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306 *
307 * If the pid is not found in the traceable list,
308 * return -1 to indicate error.
fac6795d 309 */
471d1693 310static int ust_connect_app(pid_t pid)
fac6795d 311{
91d76f53
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312 int sock;
313 struct ltt_traceable_app *lta;
379473d2 314
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315 DBG("Connect to application pid %d", pid);
316
91d76f53
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317 lta = find_app_by_pid(pid);
318 if (lta == NULL) {
319 /* App not found */
7442b2ba 320 DBG("Application pid %d not found", pid);
379473d2
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321 return -1;
322 }
fac6795d 323
91d76f53 324 sock = ustctl_connect_pid(lta->pid);
fac6795d 325 if (sock < 0) {
62d3069f 326 ERR("Fail connecting to the PID %d", pid);
fac6795d
DG
327 }
328
329 return sock;
330}
331
332/*
333 * notify_apps
334 *
335 * Notify apps by writing 42 to a named pipe using name.
336 * Every applications waiting for a ltt-sessiond will be notified
337 * and re-register automatically to the session daemon.
338 *
339 * Return open or write error value.
340 */
341static int notify_apps(const char *name)
342{
343 int fd;
344 int ret = -1;
345
e07ae692
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346 DBG("Notify the global application pipe");
347
fac6795d
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348 /* Try opening the global pipe */
349 fd = open(name, O_WRONLY);
350 if (fd < 0) {
351 goto error;
352 }
353
354 /* Notify by writing on the pipe */
355 ret = write(fd, "42", 2);
356 if (ret < 0) {
357 perror("write");
358 }
359
360error:
361 return ret;
362}
363
e065084a 364/*
5461b305 365 * setup_lttng_msg
ca95a216 366 *
5461b305
DG
367 * Setup the outgoing data buffer for the response (llm) by allocating the
368 * right amount of memory and copying the original information from the lsm
369 * structure.
ca95a216
DG
370 *
371 * Return total size of the buffer pointed by buf.
372 */
5461b305 373static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 374{
f3ed775e 375 int ret, buf_size;
ca95a216 376
f3ed775e 377 buf_size = size;
5461b305
DG
378
379 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
380 if (cmd_ctx->llm == NULL) {
ca95a216 381 perror("malloc");
5461b305 382 ret = -ENOMEM;
ca95a216
DG
383 goto error;
384 }
385
5461b305
DG
386 /* Copy common data */
387 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
388 cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
5461b305 389
5461b305
DG
390 cmd_ctx->llm->data_size = size;
391 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
392
ca95a216
DG
393 return buf_size;
394
395error:
396 return ret;
397}
398
1d4b027a
DG
399/*
400 * thread_manage_kconsumerd
401 *
402 * This thread manage the kconsumerd error sent
403 * back to the session daemon.
404 */
405static void *thread_manage_kconsumerd(void *data)
406{
407 int sock, ret;
408 enum lttcomm_return_code code;
409
410 DBG("[thread] Manage kconsumerd started");
411
412 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
413 if (ret < 0) {
414 goto error;
415 }
416
417 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
418 if (sock < 0) {
419 goto error;
420 }
421
712ea556 422 /* Getting status code from kconsumerd */
1d4b027a
DG
423 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
424 if (ret <= 0) {
425 goto error;
426 }
427
428 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
429 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
430 if (kconsumerd_cmd_sock < 0) {
712ea556 431 sem_post(&kconsumerd_sem);
1d4b027a
DG
432 perror("kconsumerd connect");
433 goto error;
434 }
435 /* Signal condition to tell that the kconsumerd is ready */
436 sem_post(&kconsumerd_sem);
437 DBG("Kconsumerd command socket ready");
438 } else {
6f61d021 439 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
440 lttcomm_get_readable_code(-code));
441 goto error;
442 }
443
712ea556
DG
444 /* Wait for any kconsumerd error */
445 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
446 if (ret <= 0) {
447 ERR("Kconsumerd closed the command socket");
448 goto error;
6f61d021 449 }
1d4b027a 450
712ea556
DG
451 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
452
1d4b027a
DG
453error:
454 kconsumerd_pid = 0;
6f61d021 455 DBG("Kconsumerd thread dying");
1d4b027a
DG
456 return NULL;
457}
458
459/*
460 * thread_manage_apps
461 *
462 * This thread manage the application socket communication
463 */
464static void *thread_manage_apps(void *data)
465{
466 int sock, ret;
467
468 /* TODO: Something more elegant is needed but fine for now */
469 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
470 * for 32-bit vs 64-bit compat processes. */
471 /* replicate in ust with version number */
472 struct {
473 int reg; /* 1:register, 0:unregister */
474 pid_t pid;
475 uid_t uid;
476 } reg_msg;
477
478 DBG("[thread] Manage apps started");
479
480 ret = lttcomm_listen_unix_sock(apps_sock);
481 if (ret < 0) {
482 goto error;
483 }
484
485 /* Notify all applications to register */
486 notify_apps(default_global_apps_pipe);
487
488 while (1) {
489 DBG("Accepting application registration");
490 /* Blocking call, waiting for transmission */
491 sock = lttcomm_accept_unix_sock(apps_sock);
492 if (sock < 0) {
493 goto error;
494 }
495
496 /* Basic recv here to handle the very simple data
497 * that the libust send to register (reg_msg).
498 */
499 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
500 if (ret < 0) {
501 perror("recv");
502 continue;
503 }
504
505 /* Add application to the global traceable list */
506 if (reg_msg.reg == 1) {
507 /* Registering */
508 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
509 if (ret < 0) {
510 /* register_traceable_app only return an error with
511 * ENOMEM. At this point, we better stop everything.
512 */
513 goto error;
514 }
515 } else {
516 /* Unregistering */
517 unregister_traceable_app(reg_msg.pid);
518 }
519 }
520
521error:
522
523 return NULL;
524}
525
8c0faa1d 526/*
693bd40b 527 * spawn_kconsumerd_thread
8c0faa1d
DG
528 *
529 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
530 * exec or it will fails.
531 */
693bd40b 532static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
533{
534 int ret;
535
536 /* Setup semaphore */
537 sem_init(&kconsumerd_sem, 0, 0);
538
1d4b027a 539 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
540 if (ret != 0) {
541 perror("pthread_create kconsumerd");
542 goto error;
543 }
544
693bd40b 545 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
546 sem_wait(&kconsumerd_sem);
547
712ea556
DG
548 if (kconsumerd_pid == 0) {
549 ERR("Kconsumerd did not start");
550 goto error;
551 }
552
8c0faa1d
DG
553 return 0;
554
555error:
712ea556 556 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
557 return ret;
558}
559
560/*
693bd40b 561 * spawn_kconsumerd
8c0faa1d 562 *
693bd40b
DG
563 * Fork and exec a kernel consumer daemon (kconsumerd).
564 *
565 * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
566 * file descriptor using the libkernelctl or kernel-ctl functions. So, a
567 * kernel consumer MUST only be spawned before creating a kernel session.
8c0faa1d
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568 *
569 * Return pid if successful else -1.
570 */
693bd40b 571static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
572{
573 int ret;
574 pid_t pid;
575
c49dc785
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576 DBG("Spawning kconsumerd");
577
8c0faa1d
DG
578 pid = fork();
579 if (pid == 0) {
580 /*
581 * Exec kconsumerd.
582 */
f57244de 583 execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
8c0faa1d
DG
584 if (errno != 0) {
585 perror("kernel start consumer exec");
586 }
587 exit(EXIT_FAILURE);
588 } else if (pid > 0) {
589 ret = pid;
590 goto error;
591 } else {
592 perror("kernel start consumer fork");
593 ret = -errno;
594 goto error;
595 }
596
597error:
598 return ret;
599}
600
693bd40b
DG
601/*
602 * start_kconsumerd
603 *
604 * Spawn the kconsumerd daemon and session daemon thread.
605 */
606static int start_kconsumerd(void)
607{
608 int ret;
609
693bd40b 610 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785
DG
611 if (kconsumerd_pid != 0) {
612 goto end;
613 }
693bd40b 614
c49dc785
DG
615 ret = spawn_kconsumerd();
616 if (ret < 0) {
617 ERR("Spawning kconsumerd failed");
618 ret = LTTCOMM_KERN_CONSUMER_FAIL;
619 pthread_mutex_unlock(&kconsumerd_pid_mutex);
620 goto error;
693bd40b 621 }
c49dc785
DG
622
623 /* Setting up the global kconsumerd_pid */
624 kconsumerd_pid = ret;
693bd40b
DG
625 pthread_mutex_unlock(&kconsumerd_pid_mutex);
626
6f61d021
DG
627 DBG("Kconsumerd pid %d", ret);
628
693bd40b 629 DBG("Spawning kconsumerd thread");
693bd40b
DG
630 ret = spawn_kconsumerd_thread();
631 if (ret < 0) {
632 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
633 goto error;
634 }
635
c49dc785
DG
636end:
637 pthread_mutex_unlock(&kconsumerd_pid_mutex);
693bd40b
DG
638 return 0;
639
640error:
641 return ret;
642}
643
8c0faa1d 644/*
f3ed775e 645 * init_kernel_tracer
8c0faa1d 646 *
f3ed775e 647 * Setup necessary data for kernel tracer action.
8c0faa1d 648 */
f3ed775e 649static void init_kernel_tracer(void)
8c0faa1d 650{
f3ed775e
DG
651 /* Set the global kernel tracer fd */
652 kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
653 if (kernel_tracer_fd < 0) {
654 WARN("No kernel tracer available");
655 kernel_tracer_fd = 0;
8c0faa1d
DG
656 }
657
f3ed775e
DG
658 DBG("Kernel tracer fd %d", kernel_tracer_fd);
659}
33a2b854 660
f3ed775e
DG
661/*
662 * start_kernel_trace
663 *
664 * Start tracing by creating trace directory and sending FDs to the kernel
665 * consumer.
666 */
667static int start_kernel_trace(struct ltt_kernel_session *session)
668{
669 int ret;
8c0faa1d 670
f3ed775e
DG
671 /* Create trace directory */
672 ret = create_trace_dir(session);
1d4b027a 673 if (ret < 0) {
f3ed775e
DG
674 if (ret == -EEXIST) {
675 ret = LTTCOMM_KERN_DIR_EXIST;
676 } else {
677 ret = LTTCOMM_KERN_DIR_FAIL;
678 goto error;
33a2b854
DG
679 }
680 }
681
f3ed775e
DG
682 if (session->kconsumer_fds_sent == 0) {
683 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
684 if (ret < 0) {
685 ERR("Send kconsumerd fds failed");
686 ret = LTTCOMM_KERN_CONSUMER_FAIL;
687 goto error;
688 }
1d4b027a 689
f3ed775e
DG
690 session->kconsumer_fds_sent = 1;
691 }
1d4b027a
DG
692
693error:
694 return ret;
8c0faa1d
DG
695}
696
697/*
f3ed775e 698 * init_default_channel
8c0faa1d 699 *
f3ed775e 700 * Allocate a channel structure and fill it.
8c0faa1d 701 */
f3ed775e 702static struct lttng_channel *init_default_channel(void)
8c0faa1d 703{
f3ed775e 704 struct lttng_channel *chan;
1d4b027a 705
f3ed775e
DG
706 chan = malloc(sizeof(struct lttng_channel));
707 if (chan == NULL) {
708 perror("init channel malloc");
709 goto error;
8c0faa1d 710 }
1d4b027a 711
f3ed775e
DG
712 if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
713 perror("snprintf defautl channel name");
714 return NULL;
715 }
716
717 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
718 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
719 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
720 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
721 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 722 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1d4b027a
DG
723
724error:
f3ed775e 725 return chan;
8c0faa1d
DG
726}
727
333f285e 728/*
f3ed775e 729 * create_kernel_session
333f285e 730 *
f3ed775e 731 * Create a kernel tracer session then create the default channel.
333f285e 732 */
f3ed775e 733static int create_kernel_session(struct ltt_session *session)
333f285e 734{
f3ed775e
DG
735 int ret;
736 struct lttng_channel *chan;
737
738 DBG("Creating kernel session");
739
740 ret = kernel_create_session(session, kernel_tracer_fd);
741 if (ret < 0) {
742 ret = LTTCOMM_KERN_SESS_FAIL;
743 goto error;
333f285e
DG
744 }
745
f3ed775e
DG
746 chan = init_default_channel();
747 if (chan == NULL) {
748 ret = LTTCOMM_FATAL;
749 goto error;
750 }
751
752 DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
753
b082db07 754 ret = kernel_create_channel(session->kernel_session, chan, session->path);
f3ed775e
DG
755 if (ret < 0) {
756 ret = LTTCOMM_KERN_CHAN_FAIL;
757 goto error;
758 }
759
760error:
761 return ret;
333f285e
DG
762}
763
fac6795d
DG
764/*
765 * process_client_msg
766 *
5461b305
DG
767 * Process the command requested by the lttng client within the command
768 * context structure. This function make sure that the return structure (llm)
769 * is set and ready for transmission before returning.
fac6795d 770 *
e065084a 771 * Return any error encountered or 0 for success.
fac6795d 772 */
5461b305 773static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 774{
5461b305 775 int ret;
fac6795d 776
5461b305 777 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 778
f3ed775e 779 /* Listing commands don't need a session */
5461b305 780 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
781 case LTTNG_CREATE_SESSION:
782 case LTTNG_LIST_SESSIONS:
f3ed775e
DG
783 case LTTNG_LIST_EVENTS:
784 case LTTNG_KERNEL_LIST_EVENTS:
785 case LTTNG_LIST_TRACEABLE_APPS:
5e16da05
MD
786 break;
787 default:
f3ed775e
DG
788 DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
789 cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
5461b305 790 if (cmd_ctx->session == NULL) {
f3ed775e
DG
791 /* If session name not found */
792 if (cmd_ctx->lsm->session_name != NULL) {
793 ret = LTTCOMM_SESS_NOT_FOUND;
794 } else { /* If no session name specified */
795 ret = LTTCOMM_SELECT_SESS;
796 }
5461b305 797 goto error;
379473d2 798 }
5e16da05 799 break;
379473d2
DG
800 }
801
f3ed775e
DG
802 /*
803 * Check kernel command for kernel session.
804 */
20fe2104 805 switch (cmd_ctx->lsm->cmd_type) {
d65106b1 806 case LTTNG_KERNEL_ADD_CONTEXT:
f3ed775e
DG
807 case LTTNG_KERNEL_CREATE_CHANNEL:
808 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
809 case LTTNG_KERNEL_DISABLE_CHANNEL:
810 case LTTNG_KERNEL_DISABLE_EVENT:
811 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
812 case LTTNG_KERNEL_ENABLE_CHANNEL:
813 case LTTNG_KERNEL_ENABLE_EVENT:
814 case LTTNG_KERNEL_LIST_EVENTS:
333f285e 815 /* Kernel tracer check */
20fe2104 816 if (kernel_tracer_fd == 0) {
333f285e
DG
817 init_kernel_tracer();
818 if (kernel_tracer_fd == 0) {
819 ret = LTTCOMM_KERN_NA;
820 goto error;
821 }
20fe2104 822 }
f3ed775e
DG
823
824 /* Need a session for kernel command */
825 if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
826 cmd_ctx->session->kernel_session == NULL) {
7b395890 827
f3ed775e
DG
828 ret = create_kernel_session(cmd_ctx->session);
829 if (ret < 0) {
830 ret = LTTCOMM_KERN_SESS_FAIL;
831 goto error;
832 }
833
7b395890 834 /* Start the kernel consumer daemon */
f3ed775e
DG
835 if (kconsumerd_pid == 0) {
836 ret = start_kconsumerd();
837 if (ret < 0) {
838 goto error;
839 }
840 }
841 }
20fe2104
DG
842 }
843
471d1693 844 /* Connect to ust apps if available pid */
5461b305 845 if (cmd_ctx->lsm->pid > 0) {
471d1693 846 /* Connect to app using ustctl API */
5461b305
DG
847 cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
848 if (cmd_ctx->ust_sock < 0) {
471d1693 849 ret = LTTCOMM_NO_TRACEABLE;
5461b305 850 goto error;
471d1693
DG
851 }
852 }
853
fac6795d 854 /* Process by command type */
5461b305 855 switch (cmd_ctx->lsm->cmd_type) {
d65106b1
DG
856 case LTTNG_KERNEL_ADD_CONTEXT:
857 {
858 int found = 0, no_event = 0;
859 struct ltt_kernel_channel *chan;
860 struct ltt_kernel_event *event;
861
862 /* Setup lttng message with no payload */
863 ret = setup_lttng_msg(cmd_ctx, 0);
864 if (ret < 0) {
865 goto setup_error;
866 }
867
868 /* Check if event name is given */
869 if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
870 no_event = 1;
871 }
872
873 if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
874 /* Go over all channels */
875 DBG("Adding context to all channels");
876 cds_list_for_each_entry(chan,
877 &cmd_ctx->session->kernel_session->channel_list.head, list) {
878 if (no_event) {
879 ret = kernel_add_channel_context(chan,
880 &cmd_ctx->lsm->u.context.ctx);
881 if (ret < 0) {
882 continue;
883 }
884 } else {
885 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
886 if (event != NULL) {
887 ret = kernel_add_event_context(event,
888 &cmd_ctx->lsm->u.context.ctx);
889 if (ret < 0) {
890 ret = LTTCOMM_KERN_CONTEXT_FAIL;
891 goto error;
892 }
893 found = 1;
894 break;
895 }
896 }
897 }
898 } else {
899 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
900 cmd_ctx->session->kernel_session);
901 if (chan == NULL) {
902 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
903 goto error;
904 }
905
906 if (no_event) {
907 ret = kernel_add_channel_context(chan,
908 &cmd_ctx->lsm->u.context.ctx);
909 if (ret < 0) {
910 ret = LTTCOMM_KERN_CONTEXT_FAIL;
911 goto error;
912 }
913 } else {
914 event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
915 if (event != NULL) {
916 ret = kernel_add_event_context(event,
917 &cmd_ctx->lsm->u.context.ctx);
918 if (ret < 0) {
919 ret = LTTCOMM_KERN_CONTEXT_FAIL;
920 goto error;
921 }
922 }
923 }
924 }
925
926 if (!found && !no_event) {
927 ret = LTTCOMM_NO_EVENT;
928 goto error;
929 }
930
931 ret = LTTCOMM_OK;
932 break;
933 }
f3ed775e 934 case LTTNG_KERNEL_CREATE_CHANNEL:
20fe2104 935 {
f3ed775e 936 /* Setup lttng message with no payload */
20fe2104
DG
937 ret = setup_lttng_msg(cmd_ctx, 0);
938 if (ret < 0) {
939 goto setup_error;
940 }
941
f3ed775e 942 /* Kernel tracer */
8c0faa1d
DG
943 DBG("Creating kernel channel");
944
f3ed775e 945 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
b082db07 946 &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path);
20fe2104
DG
947 if (ret < 0) {
948 ret = LTTCOMM_KERN_CHAN_FAIL;
949 goto error;
950 }
951
952 ret = LTTCOMM_OK;
953 break;
954 }
26cc6b4e
DG
955 case LTTNG_KERNEL_DISABLE_CHANNEL:
956 {
957 struct ltt_kernel_channel *chan;
958
959 /* Setup lttng message with no payload */
960 ret = setup_lttng_msg(cmd_ctx, 0);
961 if (ret < 0) {
962 goto setup_error;
963 }
964
965 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
966 cmd_ctx->session->kernel_session);
967 if (chan == NULL) {
968 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
969 goto error;
970 } else if (chan->enabled == 1) {
971 ret = kernel_disable_channel(chan);
972 if (ret < 0) {
973 if (ret != EEXIST) {
974 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
975 }
976 goto error;
977 }
978 }
979
980 kernel_wait_quiescent(kernel_tracer_fd);
981 ret = LTTCOMM_OK;
982 break;
983 }
e953ef25
DG
984 case LTTNG_KERNEL_DISABLE_EVENT:
985 {
e953ef25 986 struct ltt_kernel_channel *chan;
19e70852 987 struct ltt_kernel_event *ev;
e953ef25
DG
988
989 /* Setup lttng message with no payload */
990 ret = setup_lttng_msg(cmd_ctx, 0);
991 if (ret < 0) {
992 goto setup_error;
993 }
994
19e70852
DG
995 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
996 cmd_ctx->session->kernel_session);
997 if (chan == NULL) {
998 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
999 goto error;
1000 }
e953ef25 1001
19e70852
DG
1002 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
1003 if (ev != NULL) {
1004 DBG("Disabling kernel event %s for channel %s.",
1005 cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
1006 ret = kernel_disable_event(ev);
1007 if (ret < 0) {
1008 ret = LTTCOMM_KERN_ENABLE_FAIL;
1009 goto error;
e953ef25
DG
1010 }
1011 }
1012
19e70852
DG
1013 kernel_wait_quiescent(kernel_tracer_fd);
1014 ret = LTTCOMM_OK;
e953ef25
DG
1015 break;
1016 }
950131af
DG
1017 case LTTNG_KERNEL_DISABLE_ALL_EVENT:
1018 {
1019 struct ltt_kernel_channel *chan;
1020 struct ltt_kernel_event *ev;
1021
1022 /* Setup lttng message with no payload */
1023 ret = setup_lttng_msg(cmd_ctx, 0);
1024 if (ret < 0) {
1025 goto setup_error;
1026 }
1027
1028 DBG("Disabling all enabled kernel events");
1029
1030 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1031 cmd_ctx->session->kernel_session);
1032 if (chan == NULL) {
1033 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1034 goto error;
1035 }
1036
1037 /* For each event in the kernel session */
1038 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1039 DBG("Disabling kernel event %s for channel %s.",
1040 ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
1041 ret = kernel_disable_event(ev);
1042 if (ret < 0) {
1043 continue;
1044 }
1045 }
1046
1047 /* Quiescent wait after event disable */
1048 kernel_wait_quiescent(kernel_tracer_fd);
1049 ret = LTTCOMM_OK;
1050 break;
1051 }
d36b8583
DG
1052 case LTTNG_KERNEL_ENABLE_CHANNEL:
1053 {
1054 struct ltt_kernel_channel *chan;
1055
1056 /* Setup lttng message with no payload */
1057 ret = setup_lttng_msg(cmd_ctx, 0);
1058 if (ret < 0) {
1059 goto setup_error;
1060 }
1061
1062 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1063 cmd_ctx->session->kernel_session);
1064 if (chan == NULL) {
1065 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1066 goto error;
1067 } else if (chan->enabled == 0) {
1068 ret = kernel_enable_channel(chan);
1069 if (ret < 0) {
1070 if (ret != EEXIST) {
1071 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
1072 }
1073 goto error;
1074 }
1075 }
1076
1077 kernel_wait_quiescent(kernel_tracer_fd);
1078 ret = LTTCOMM_OK;
1079 break;
1080 }
f3ed775e 1081 case LTTNG_KERNEL_ENABLE_EVENT:
894be886 1082 {
f3ed775e 1083 struct ltt_kernel_channel *chan;
19e70852 1084 struct ltt_kernel_event *ev;
f3ed775e 1085
894be886
DG
1086 /* Setup lttng message with no payload */
1087 ret = setup_lttng_msg(cmd_ctx, 0);
1088 if (ret < 0) {
1089 goto setup_error;
1090 }
1091
19e70852
DG
1092 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1093 cmd_ctx->session->kernel_session);
1094 if (chan == NULL) {
1095 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1096 goto error;
f34daff7
DG
1097 }
1098
19e70852
DG
1099 ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
1100 if (ev == NULL) {
1101 DBG("Creating kernel event %s for channel %s.",
950131af 1102 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852 1103 ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
f3ed775e 1104 } else {
19e70852 1105 DBG("Enabling kernel event %s for channel %s.",
950131af 1106 cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
19e70852
DG
1107 ret = kernel_enable_event(ev);
1108 }
1109
1110 if (ret < 0) {
1111 ret = LTTCOMM_KERN_ENABLE_FAIL;
1112 goto error;
f3ed775e 1113 }
19e70852
DG
1114
1115 kernel_wait_quiescent(kernel_tracer_fd);
1116 ret = LTTCOMM_OK;
894be886
DG
1117 break;
1118 }
f3ed775e 1119 case LTTNG_KERNEL_ENABLE_ALL_EVENT:
33a2b854 1120 {
950131af 1121 int pos, size;
33a2b854 1122 char *event_list, *event, *ptr;
f3ed775e 1123 struct ltt_kernel_channel *chan;
950131af
DG
1124 struct ltt_kernel_event *ev;
1125 struct lttng_event ev_attr;
33a2b854
DG
1126
1127 /* Setup lttng message with no payload */
1128 ret = setup_lttng_msg(cmd_ctx, 0);
1129 if (ret < 0) {
1130 goto setup_error;
1131 }
1132
1133 DBG("Enabling all kernel event");
1134
950131af
DG
1135 chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1136 cmd_ctx->session->kernel_session);
1137 if (chan == NULL) {
1138 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
33a2b854
DG
1139 goto error;
1140 }
1141
950131af
DG
1142 /* For each event in the kernel session */
1143 cds_list_for_each_entry(ev, &chan->events_list.head, list) {
1144 DBG("Enabling kernel event %s for channel %s.",
1145 ev->event->name, chan->channel->name);
1146 ret = kernel_enable_event(ev);
1147 if (ret < 0) {
1148 continue;
f3ed775e
DG
1149 }
1150 }
1151
950131af
DG
1152 size = kernel_list_events(kernel_tracer_fd, &event_list);
1153 if (size < 0) {
1154 ret = LTTCOMM_KERN_LIST_FAIL;
f3ed775e
DG
1155 goto error;
1156 }
1157
33a2b854
DG
1158 ptr = event_list;
1159 while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
950131af
DG
1160 ev = get_kernel_event_by_name(event, chan);
1161 if (ev == NULL) {
1162 strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
1163 /* Default event type for enable all */
1164 ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
1165 /* Enable each single tracepoint event */
1166 ret = kernel_create_event(&ev_attr, chan);
1167 if (ret < 0) {
1168 /* Ignore error here and continue */
950131af 1169 }
33a2b854 1170 }
950131af 1171
33a2b854
DG
1172 /* Move pointer to the next line */
1173 ptr += pos + 1;
1174 free(event);
1175 }
1176
1177 free(event_list);
1178
f3ed775e
DG
1179 /* Quiescent wait after event enable */
1180 kernel_wait_quiescent(kernel_tracer_fd);
33a2b854
DG
1181 ret = LTTCOMM_OK;
1182 break;
1183 }
f3ed775e 1184 case LTTNG_KERNEL_LIST_EVENTS:
2ef84c95
DG
1185 {
1186 char *event_list;
f3ed775e
DG
1187 ssize_t size = 0;
1188
1189 DBG("Listing kernel events");
2ef84c95
DG
1190
1191 size = kernel_list_events(kernel_tracer_fd, &event_list);
1192 if (size < 0) {
1193 ret = LTTCOMM_KERN_LIST_FAIL;
1194 goto error;
1195 }
1196
1197 /*
1198 * Setup lttng message with payload size set to the event list size in
1199 * bytes and then copy list into the llm payload.
1200 */
1201 ret = setup_lttng_msg(cmd_ctx, size);
1202 if (ret < 0) {
1203 goto setup_error;
1204 }
1205
1206 /* Copy event list into message payload */
1207 memcpy(cmd_ctx->llm->payload, event_list, size);
1208
1209 free(event_list);
1210
1211 ret = LTTCOMM_OK;
1212 break;
1213 }
f3ed775e 1214 case LTTNG_START_TRACE:
8c0faa1d
DG
1215 {
1216 struct ltt_kernel_channel *chan;
f3ed775e 1217
8c0faa1d
DG
1218 /* Setup lttng message with no payload */
1219 ret = setup_lttng_msg(cmd_ctx, 0);
1220 if (ret < 0) {
1221 goto setup_error;
1222 }
1223
f3ed775e
DG
1224 /* Kernel tracing */
1225 if (cmd_ctx->session->kernel_session != NULL) {
1226 if (cmd_ctx->session->kernel_session->metadata == NULL) {
1227 DBG("Open kernel metadata");
58a97671
DG
1228 ret = kernel_open_metadata(cmd_ctx->session->kernel_session,
1229 cmd_ctx->session->path);
f3ed775e
DG
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
fac6795d 1758/*
d6f42150 1759 * set_permissions
fac6795d 1760 *
5e16da05
MD
1761 * Set the tracing group gid onto the client socket.
1762 *
1763 * Race window between mkdir and chown is OK because we are going from
1764 * less permissive (root.root) to more permissive (root.tracing).
fac6795d 1765 */
d6f42150 1766static int set_permissions(void)
fac6795d
DG
1767{
1768 int ret;
1769 struct group *grp;
1770
1771 /* Decide which group name to use */
1772 (opt_tracing_group != NULL) ?
1773 (grp = getgrnam(opt_tracing_group)) :
1774 (grp = getgrnam(default_tracing_group));
1775
1776 if (grp == NULL) {
75462a81 1777 ERR("Missing tracing group. Aborting execution.\n");
fac6795d
DG
1778 ret = -1;
1779 goto end;
1780 }
1781
d6f42150
DG
1782 /* Set lttng run dir */
1783 ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
1784 if (ret < 0) {
1785 ERR("Unable to set group on " LTTNG_RUNDIR);
1786 perror("chown");
1787 }
1788
1789 /* lttng client socket path */
fac6795d
DG
1790 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
1791 if (ret < 0) {
d6f42150
DG
1792 ERR("Unable to set group on %s", client_unix_sock_path);
1793 perror("chown");
1794 }
1795
1796 /* kconsumerd error socket path */
1797 ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
1798 if (ret < 0) {
1799 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
1800 perror("chown");
1801 }
1802
d6f42150 1803 DBG("All permissions are set");
e07ae692 1804
fac6795d
DG
1805end:
1806 return ret;
1807}
1808
d6f42150
DG
1809/*
1810 * create_lttng_rundir
1811 *
1812 * Create the lttng run directory needed for all
1813 * global sockets and pipe.
1814 */
1815static int create_lttng_rundir(void)
1816{
1817 int ret;
1818
1819 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
1820 if (ret < 0) {
b1f11e69
DG
1821 if (errno != EEXIST) {
1822 ERR("Unable to create " LTTNG_RUNDIR);
1823 goto error;
1824 } else {
1825 ret = 0;
1826 }
d6f42150
DG
1827 }
1828
1829error:
1830 return ret;
1831}
1832
1833/*
1834 * set_kconsumerd_sockets
1835 *
1836 * Setup sockets and directory needed by the kconsumerd
1837 * communication with the session daemon.
1838 */
1839static int set_kconsumerd_sockets(void)
1840{
1841 int ret;
1842
1843 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
1844 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
1845 }
1846
1847 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
1848 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
1849 }
1850
1851 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
1852 if (ret < 0) {
6beb2242
DG
1853 if (errno != EEXIST) {
1854 ERR("Failed to create " KCONSUMERD_PATH);
1855 goto error;
1856 }
1857 ret = 0;
d6f42150
DG
1858 }
1859
1860 /* Create the kconsumerd error unix socket */
1861 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
1862 if (kconsumerd_err_sock < 0) {
1863 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
1864 ret = -1;
1865 goto error;
1866 }
1867
1868 /* File permission MUST be 660 */
1869 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1870 if (ret < 0) {
1871 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
1872 perror("chmod");
1873 goto error;
1874 }
1875
1876error:
1877 return ret;
1878}
1879
fac6795d 1880/*
62bd06d8 1881 * sighandler
fac6795d 1882 *
62bd06d8 1883 * Signal handler for the daemon
fac6795d
DG
1884 */
1885static void sighandler(int sig)
1886{
1887 switch (sig) {
1888 case SIGPIPE:
e07ae692 1889 DBG("SIGPIPE catched");
87378cf5 1890 return;
fac6795d 1891 case SIGINT:
e07ae692
DG
1892 DBG("SIGINT catched");
1893 cleanup();
1894 break;
fac6795d 1895 case SIGTERM:
e07ae692 1896 DBG("SIGTERM catched");
fac6795d 1897 cleanup();
686204ab 1898 break;
fac6795d
DG
1899 default:
1900 break;
1901 }
1902
1903 exit(EXIT_SUCCESS);
1904}
1905
1906/*
1d4b027a 1907 * set_signal_handler
fac6795d 1908 *
1d4b027a
DG
1909 * Setup signal handler for :
1910 * SIGINT, SIGTERM, SIGPIPE
fac6795d 1911 */
1d4b027a 1912static int set_signal_handler(void)
fac6795d 1913{
1d4b027a
DG
1914 int ret = 0;
1915 struct sigaction sa;
1916 sigset_t sigset;
fac6795d 1917
1d4b027a
DG
1918 if ((ret = sigemptyset(&sigset)) < 0) {
1919 perror("sigemptyset");
1920 return ret;
1921 }
d6f42150 1922
1d4b027a
DG
1923 sa.sa_handler = sighandler;
1924 sa.sa_mask = sigset;
1925 sa.sa_flags = 0;
1926 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
1927 perror("sigaction");
1928 return ret;
d6f42150
DG
1929 }
1930
1d4b027a
DG
1931 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
1932 perror("sigaction");
1933 return ret;
d6f42150 1934 }
aaf26714 1935
1d4b027a
DG
1936 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
1937 perror("sigaction");
1938 return ret;
8c0faa1d
DG
1939 }
1940
1d4b027a
DG
1941 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
1942
1943 return ret;
fac6795d
DG
1944}
1945
f3ed775e
DG
1946/*
1947 * set_ulimit
1948 *
1949 * Set open files limit to unlimited. This daemon can open a large number of
1950 * file descriptors in order to consumer multiple kernel traces.
1951 */
1952static void set_ulimit(void)
1953{
1954 int ret;
1955 struct rlimit lim;
1956
1957 lim.rlim_cur = 65535;
1958 lim.rlim_max = 65535;
1959
1960 ret = setrlimit(RLIMIT_NOFILE, &lim);
1961 if (ret < 0) {
1962 perror("failed to set open files limit");
1963 }
1964}
1965
fac6795d
DG
1966/*
1967 * main
1968 */
1969int main(int argc, char **argv)
1970{
fac6795d
DG
1971 int ret = 0;
1972 void *status;
b082db07 1973 const char *home_path;
fac6795d
DG
1974
1975 /* Parse arguments */
1976 progname = argv[0];
1977 if ((ret = parse_args(argc, argv) < 0)) {
1978 goto error;
1979 }
1980
1981 /* Daemonize */
1982 if (opt_daemon) {
53094c05
DG
1983 ret = daemon(0, 0);
1984 if (ret < 0) {
1985 perror("daemon");
1986 goto error;
1987 }
fac6795d
DG
1988 }
1989
1990 /* Check if daemon is UID = 0 */
1991 is_root = !getuid();
1992
1993 /* Set all sockets path */
1994 if (is_root) {
d6f42150
DG
1995 ret = create_lttng_rundir();
1996 if (ret < 0) {
1997 goto error;
1998 }
1999
fac6795d 2000 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2001 snprintf(apps_unix_sock_path, PATH_MAX,
2002 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
2003 }
2004
2005 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2006 snprintf(client_unix_sock_path, PATH_MAX,
2007 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
2008 }
2009
2010 ret = set_kconsumerd_sockets();
2011 if (ret < 0) {
2012 goto error;
fac6795d 2013 }
20fe2104
DG
2014
2015 /* Setup kernel tracer */
2016 init_kernel_tracer();
f3ed775e
DG
2017
2018 /* Set ulimit for open files */
2019 set_ulimit();
fac6795d 2020 } else {
b082db07
DG
2021 home_path = get_home_dir();
2022 if (home_path == NULL) {
2023 ERR("Can't get HOME directory for sockets creation.\n \
2024 Please specify --socket PATH.");
2025 goto error;
2026 }
2027
fac6795d 2028 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 2029 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 2030 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
2031 }
2032
2033 /* Set the cli tool unix socket path */
2034 if (strlen(client_unix_sock_path) == 0) {
d6f42150 2035 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 2036 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d
DG
2037 }
2038 }
2039
847177cd
DG
2040 DBG("Client socket path %s", client_unix_sock_path);
2041 DBG("Application socket path %s", apps_unix_sock_path);
2042
fac6795d
DG
2043 /* See if daemon already exist. If any of the two
2044 * socket needed by the daemon are present, this test fails
2045 */
2046 if ((ret = check_existing_daemon()) == 0) {
75462a81 2047 ERR("Already running daemon.\n");
ab118b20 2048 /* We do not goto error because we must not
d6f42150 2049 * cleanup() because a daemon is already running.
ab118b20 2050 */
5e16da05 2051 exit(EXIT_FAILURE);
fac6795d
DG
2052 }
2053
2054 if (set_signal_handler() < 0) {
2055 goto error;
2056 }
2057
d6f42150 2058 /* Setup the needed unix socket */
fac6795d
DG
2059 if (init_daemon_socket() < 0) {
2060 goto error;
2061 }
2062
2063 /* Set credentials to socket */
d6f42150 2064 if (is_root && (set_permissions() < 0)) {
fac6795d
DG
2065 goto error;
2066 }
2067
5b8719f5
DG
2068 /* Get parent pid if -S, --sig-parent is specified. */
2069 if (opt_sig_parent) {
2070 ppid = getppid();
2071 }
2072
fac6795d
DG
2073 while (1) {
2074 /* Create thread to manage the client socket */
1d4b027a 2075 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
fac6795d
DG
2076 if (ret != 0) {
2077 perror("pthread_create");
2078 goto error;
2079 }
2080
2081 /* Create thread to manage application socket */
1d4b027a 2082 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
fac6795d
DG
2083 if (ret != 0) {
2084 perror("pthread_create");
2085 goto error;
2086 }
2087
1d4b027a
DG
2088 ret = pthread_join(client_thread, &status);
2089 if (ret != 0) {
2090 perror("pthread_join");
2091 goto error;
fac6795d
DG
2092 }
2093 }
2094
2095 cleanup();
5e16da05 2096 exit(EXIT_SUCCESS);
fac6795d
DG
2097
2098error:
2099 cleanup();
5e16da05 2100 exit(EXIT_FAILURE);
fac6795d 2101}
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