Privatize lttng-sessiond-comm
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
996b65c8 3 * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d
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4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
82a3637f
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7 * as published by the Free Software Foundation; only version 2
8 * of the License.
91d76f53 9 *
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10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
91d76f53 14 *
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15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
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18 */
19
20#define _GNU_SOURCE
21#include <fcntl.h>
22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
7a485870 25#include <poll.h>
fac6795d 26#include <pthread.h>
8c0faa1d 27#include <semaphore.h>
fac6795d
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28#include <signal.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <sys/ipc.h>
b73401da 33#include <sys/mount.h>
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34#include <sys/shm.h>
35#include <sys/socket.h>
36#include <sys/stat.h>
37#include <sys/types.h>
f3ed775e
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38#include <sys/time.h>
39#include <sys/resource.h>
fac6795d
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40#include <unistd.h>
41
42#include <urcu/list.h> /* URCU list library (-lurcu) */
5b97ec60 43#include <lttng/lttng.h>
e88129fc 44#include <lttng-sessiond-comm.h>
fac6795d 45
b579acd9 46#include "context.h"
fac6795d 47#include "ltt-sessiond.h"
75462a81 48#include "lttngerr.h"
20fe2104 49#include "kernel-ctl.h"
9e78d6ae 50#include "ust-ctl.h"
5b74c7b1 51#include "session.h"
91d76f53 52#include "traceable-app.h"
5dc18550 53#include "lttng-kconsumerd.h"
8e68d1c8 54#include "utils.h"
fac6795d 55
75462a81 56/* Const values */
686204ab 57const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 58const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
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59const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
60const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
61
fac6795d 62/* Variables */
1d4b027a 63int opt_verbose; /* Not static for lttngerr.h */
31f73cc9 64int opt_verbose_kconsumerd; /* Not static for lttngerr.h */
1d4b027a 65int opt_quiet; /* Not static for lttngerr.h */
d063d709 66
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67const char *progname;
68const char *opt_tracing_group;
5b8719f5 69static int opt_sig_parent;
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70static int opt_daemon;
71static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
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72static pid_t ppid; /* Parent PID for --sig-parent option */
73static pid_t kconsumerd_pid;
7a485870 74static struct pollfd *kernel_pollfd;
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 */
d6f42150
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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;
7a485870 87static int kernel_poll_pipe[2];
1d4b027a 88
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89/*
90 * Quit pipe for all threads. This permits a single cancellation point
91 * for all threads when receiving an event on the pipe.
92 */
93static int thread_quit_pipe[2];
94
1d4b027a 95/* Pthread, Mutexes and Semaphores */
8c0faa1d 96static pthread_t kconsumerd_thread;
1d4b027a
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97static pthread_t apps_thread;
98static pthread_t client_thread;
7a485870 99static pthread_t kernel_thread;
8c0faa1d
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100static sem_t kconsumerd_sem;
101
1d4b027a 102static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 103
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104static int modprobe_remove_kernel_modules(void);
105
b5541356
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106/*
107 * Pointer initialized before thread creation.
108 *
109 * This points to the tracing session list containing the session count and a
110 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
111 * MUST NOT be taken if you call a public function in session.c.
04ea676f 112 *
d063d709
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113 * The lock is nested inside the structure: session_list_ptr->lock. Please use
114 * lock_session_list and unlock_session_list for lock acquisition.
b5541356
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115 */
116static struct ltt_session_list *session_list_ptr;
117
996b65c8
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118static gid_t allowed_group(void)
119{
120 struct group *grp;
121
274e143b
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122 if (opt_tracing_group) {
123 grp = getgrnam(opt_tracing_group);
124 } else {
125 grp = getgrnam(default_tracing_group);
126 }
996b65c8
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127 if (!grp) {
128 return -1;
129 } else {
130 return grp->gr_gid;
131 }
132}
133
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134/*
135 * Init quit pipe.
136 *
137 * Return -1 on error or 0 if all pipes are created.
138 */
139static int init_thread_quit_pipe(void)
140{
141 int ret;
142
143 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
144 if (ret < 0) {
145 perror("thread quit pipe");
146 goto error;
147 }
148
149error:
150 return ret;
151}
152
fac6795d 153/*
d063d709
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154 * Complete teardown of a kernel session. This free all data structure related
155 * to a kernel session and update counter.
fac6795d 156 */
1d4b027a 157static void teardown_kernel_session(struct ltt_session *session)
fac6795d 158{
1d4b027a
DG
159 if (session->kernel_session != NULL) {
160 DBG("Tearing down kernel session");
c363b55d 161 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
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162 /* Extra precaution */
163 session->kernel_session = NULL;
fac6795d 164 }
fac6795d
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165}
166
cf3af59e
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167static void stop_threads(void)
168{
169 /* Stopping all threads */
170 DBG("Terminating all threads");
171 close(thread_quit_pipe[0]);
172 close(thread_quit_pipe[1]);
173}
174
fac6795d 175/*
d063d709 176 * Cleanup the daemon
fac6795d 177 */
cf3af59e 178static void cleanup(void)
fac6795d 179{
1d4b027a
DG
180 int ret;
181 char *cmd;
af9737e9 182 struct ltt_session *sess, *stmp;
fac6795d 183
1d4b027a 184 DBG("Cleaning up");
e07ae692 185
1d4b027a 186 /* <fun> */
273ea72c
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187 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
188 "Matthew, BEET driven development works!%c[%dm",
189 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 190 /* </fun> */
fac6795d 191
1d4b027a
DG
192 DBG("Removing %s directory", LTTNG_RUNDIR);
193 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
194 if (ret < 0) {
195 ERR("asprintf failed. Something is really wrong!");
196 }
5461b305 197
1d4b027a
DG
198 /* Remove lttng run directory */
199 ret = system(cmd);
200 if (ret < 0) {
201 ERR("Unable to clean " LTTNG_RUNDIR);
202 }
5461b305 203
1d4b027a 204 DBG("Cleaning up all session");
fac6795d 205
b5541356 206 /* Destroy session list mutex */
273ea72c
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207 if (session_list_ptr != NULL) {
208 pthread_mutex_destroy(&session_list_ptr->lock);
209
210 /* Cleanup ALL session */
af9737e9 211 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
273ea72c
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212 teardown_kernel_session(sess);
213 // TODO complete session cleanup (including UST)
214 }
215 }
216
217 pthread_mutex_destroy(&kconsumerd_pid_mutex);
b5541356 218
f3ed775e 219 DBG("Closing kernel fd");
1d4b027a 220 close(kernel_tracer_fd);
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221
222 DBG("Unloading kernel modules");
223 modprobe_remove_kernel_modules();
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224}
225
e065084a 226/*
d063d709 227 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 228 *
d063d709 229 * Return lttcomm error code.
e065084a
DG
230 */
231static int send_unix_sock(int sock, void *buf, size_t len)
232{
233 /* Check valid length */
234 if (len <= 0) {
235 return -1;
236 }
237
238 return lttcomm_send_unix_sock(sock, buf, len);
239}
240
5461b305 241/*
d063d709 242 * Free memory of a command context structure.
5461b305 243 */
a2fb29a5 244static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 245{
a2fb29a5
DG
246 DBG("Clean command context structure");
247 if (*cmd_ctx) {
248 if ((*cmd_ctx)->llm) {
249 free((*cmd_ctx)->llm);
5461b305 250 }
a2fb29a5
DG
251 if ((*cmd_ctx)->lsm) {
252 free((*cmd_ctx)->lsm);
5461b305 253 }
a2fb29a5
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254 free(*cmd_ctx);
255 *cmd_ctx = NULL;
5461b305
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256 }
257}
258
f3ed775e 259/*
d063d709 260 * Send all stream fds of kernel channel to the consumer.
f3ed775e 261 */
7a485870 262static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
263{
264 int ret;
265 size_t nb_fd;
266 struct ltt_kernel_stream *stream;
f3ed775e
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267 struct lttcomm_kconsumerd_header lkh;
268 struct lttcomm_kconsumerd_msg lkm;
269
7a485870
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270 DBG("Sending fds of channel %s to kernel consumer", channel->channel->name);
271
272 nb_fd = channel->stream_count;
f3ed775e
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273
274 /* Setup header */
7a485870 275 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
f3ed775e
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276 lkh.cmd_type = ADD_STREAM;
277
278 DBG("Sending kconsumerd header");
279
280 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
281 if (ret < 0) {
282 perror("send kconsumerd header");
283 goto error;
284 }
285
7a485870
DG
286 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
287 if (stream->fd != 0) {
f3ed775e
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288 lkm.fd = stream->fd;
289 lkm.state = stream->state;
7a485870 290 lkm.max_sb_size = channel->channel->attr.subbuf_size;
f3ed775e 291 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
99497cd0 292 lkm.path_name[PATH_MAX - 1] = '\0';
f3ed775e
DG
293
294 DBG("Sending fd %d to kconsumerd", lkm.fd);
295
296 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
297 if (ret < 0) {
298 perror("send kconsumerd fd");
299 goto error;
300 }
301 }
302 }
303
7a485870 304 DBG("Kconsumerd channel fds sent");
f3ed775e
DG
305
306 return 0;
307
308error:
309 return ret;
310}
311
312/*
d063d709 313 * Send all stream fds of the kernel session to the consumer.
f3ed775e 314 */
7a485870 315static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
f3ed775e
DG
316{
317 int ret;
318 struct ltt_kernel_channel *chan;
7a485870
DG
319 struct lttcomm_kconsumerd_header lkh;
320 struct lttcomm_kconsumerd_msg lkm;
321
322 /* Setup header */
323 lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg);
324 lkh.cmd_type = ADD_STREAM;
325
326 DBG("Sending kconsumerd header for metadata");
327
328 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
329 if (ret < 0) {
330 perror("send kconsumerd header");
331 goto error;
332 }
333
334 DBG("Sending metadata stream fd");
335
336 if (session->metadata_stream_fd != 0) {
337 /* Send metadata stream fd first */
338 lkm.fd = session->metadata_stream_fd;
339 lkm.state = ACTIVE_FD;
340 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
341 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
99497cd0 342 lkm.path_name[PATH_MAX - 1] = '\0';
7a485870
DG
343
344 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
345 if (ret < 0) {
346 perror("send kconsumerd fd");
347 goto error;
348 }
349 }
f3ed775e 350
f3ed775e 351 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
7a485870 352 ret = send_kconsumerd_channel_fds(sock, chan);
f3ed775e 353 if (ret < 0) {
7a485870 354 goto error;
f3ed775e
DG
355 }
356 }
357
7a485870
DG
358 DBG("Kconsumerd fds (metadata and channel streams) sent");
359
f3ed775e
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360 return 0;
361
362error:
363 return ret;
364}
365
97b1a726 366#ifdef DISABLED
fac6795d 367/*
d063d709
DG
368 * Return a socket connected to the libust communication socket of the
369 * application identified by the pid.
fac6795d 370 *
d063d709 371 * If the pid is not found in the traceable list, return -1 to indicate error.
fac6795d 372 */
471d1693 373static int ust_connect_app(pid_t pid)
fac6795d 374{
91d76f53
DG
375 int sock;
376 struct ltt_traceable_app *lta;
379473d2 377
e07ae692
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378 DBG("Connect to application pid %d", pid);
379
91d76f53
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380 lta = find_app_by_pid(pid);
381 if (lta == NULL) {
382 /* App not found */
7442b2ba 383 DBG("Application pid %d not found", pid);
379473d2
DG
384 return -1;
385 }
fac6795d 386
91d76f53 387 sock = ustctl_connect_pid(lta->pid);
fac6795d 388 if (sock < 0) {
62d3069f 389 ERR("Fail connecting to the PID %d", pid);
fac6795d
DG
390 }
391
392 return sock;
393}
97b1a726 394#endif /* DISABLED */
fac6795d
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395
396/*
d063d709
DG
397 * Notify apps by writing 42 to a named pipe using name. Every applications
398 * waiting for a ltt-sessiond will be notified and re-register automatically to
399 * the session daemon.
fac6795d 400 *
d063d709 401 * Return open or write error value.
fac6795d
DG
402 */
403static int notify_apps(const char *name)
404{
405 int fd;
406 int ret = -1;
407
e07ae692
DG
408 DBG("Notify the global application pipe");
409
fac6795d
DG
410 /* Try opening the global pipe */
411 fd = open(name, O_WRONLY);
412 if (fd < 0) {
413 goto error;
414 }
415
416 /* Notify by writing on the pipe */
417 ret = write(fd, "42", 2);
418 if (ret < 0) {
419 perror("write");
420 }
421
422error:
423 return ret;
424}
425
e065084a 426/*
d063d709
DG
427 * Setup the outgoing data buffer for the response (llm) by allocating the
428 * right amount of memory and copying the original information from the lsm
429 * structure.
ca95a216 430 *
d063d709 431 * Return total size of the buffer pointed by buf.
ca95a216 432 */
5461b305 433static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 434{
f3ed775e 435 int ret, buf_size;
ca95a216 436
f3ed775e 437 buf_size = size;
5461b305
DG
438
439 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
440 if (cmd_ctx->llm == NULL) {
ca95a216 441 perror("malloc");
5461b305 442 ret = -ENOMEM;
ca95a216
DG
443 goto error;
444 }
445
5461b305
DG
446 /* Copy common data */
447 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 448 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 449
5461b305
DG
450 cmd_ctx->llm->data_size = size;
451 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
452
ca95a216
DG
453 return buf_size;
454
455error:
456 return ret;
457}
458
7a485870 459/*
d063d709
DG
460 * Update the kernel pollfd set of all channel fd available over all tracing
461 * session. Add the wakeup pipe at the end of the set.
7a485870
DG
462 */
463static int update_kernel_pollfd(void)
464{
465 int i = 0;
273ea72c
DG
466 /*
467 * The wakup pipe and the quit pipe are needed so the number of fds starts
468 * at 2 for those pipes.
469 */
470 unsigned int nb_fd = 2;
7a485870
DG
471 struct ltt_session *session;
472 struct ltt_kernel_channel *channel;
473
474 DBG("Updating kernel_pollfd");
475
476 /* Get the number of channel of all kernel session */
6c9cc2ab 477 lock_session_list();
b5541356
DG
478 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
479 lock_session(session);
7a485870 480 if (session->kernel_session == NULL) {
b5541356 481 unlock_session(session);
7a485870
DG
482 continue;
483 }
484 nb_fd += session->kernel_session->channel_count;
b5541356 485 unlock_session(session);
7a485870
DG
486 }
487
488 DBG("Resizing kernel_pollfd to size %d", nb_fd);
489
490 kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd));
491 if (kernel_pollfd == NULL) {
492 perror("malloc kernel_pollfd");
493 goto error;
494 }
495
b5541356
DG
496 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
497 lock_session(session);
7a485870 498 if (session->kernel_session == NULL) {
b5541356 499 unlock_session(session);
7a485870
DG
500 continue;
501 }
502 if (i >= nb_fd) {
503 ERR("To much channel for kernel_pollfd size");
b5541356 504 unlock_session(session);
7a485870
DG
505 break;
506 }
507 cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) {
508 kernel_pollfd[i].fd = channel->fd;
509 kernel_pollfd[i].events = POLLIN | POLLRDNORM;
510 i++;
511 }
b5541356 512 unlock_session(session);
7a485870 513 }
6c9cc2ab 514 unlock_session_list();
7a485870
DG
515
516 /* Adding wake up pipe */
273ea72c
DG
517 kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0];
518 kernel_pollfd[nb_fd - 2].events = POLLIN;
519
520 /* Adding the quit pipe */
521 kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0];
7a485870
DG
522
523 return nb_fd;
524
525error:
6c9cc2ab 526 unlock_session_list();
7a485870
DG
527 return -1;
528}
529
530/*
d063d709
DG
531 * Find the channel fd from 'fd' over all tracing session. When found, check
532 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 533 *
d063d709 534 * Useful for CPU hotplug feature.
7a485870
DG
535 */
536static int update_kernel_stream(int fd)
537{
538 int ret = 0;
539 struct ltt_session *session;
540 struct ltt_kernel_channel *channel;
541
542 DBG("Updating kernel streams for channel fd %d", fd);
543
6c9cc2ab 544 lock_session_list();
b5541356
DG
545 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
546 lock_session(session);
7a485870 547 if (session->kernel_session == NULL) {
b5541356 548 unlock_session(session);
7a485870
DG
549 continue;
550 }
551 cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) {
552 if (channel->fd == fd) {
553 DBG("Channel found, updating kernel streams");
554 ret = kernel_open_channel_stream(channel);
555 if (ret < 0) {
556 goto end;
557 }
558 /*
559 * Have we already sent fds to the consumer? If yes, it means that
560 * tracing is started so it is safe to send our updated stream fds.
561 */
562 if (session->kernel_session->kconsumer_fds_sent == 1) {
563 ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel);
564 if (ret < 0) {
565 goto end;
566 }
567 }
568 goto end;
569 }
570 }
b5541356 571 unlock_session(session);
7a485870
DG
572 }
573
574end:
6c9cc2ab 575 unlock_session_list();
b5541356
DG
576 if (session) {
577 unlock_session(session);
578 }
7a485870
DG
579 return ret;
580}
581
582/*
d063d709 583 * This thread manage event coming from the kernel.
7a485870 584 *
d063d709
DG
585 * Features supported in this thread:
586 * -) CPU Hotplug
7a485870
DG
587 */
588static void *thread_manage_kernel(void *data)
589{
590 int ret, i, nb_fd = 0;
591 char tmp;
592 int update_poll_flag = 1;
593
594 DBG("Thread manage kernel started");
595
596 while (1) {
597 if (update_poll_flag == 1) {
598 nb_fd = update_kernel_pollfd();
599 if (nb_fd < 0) {
600 goto error;
601 }
602 update_poll_flag = 0;
603 }
604
605 DBG("Polling on %d fds", nb_fd);
606
607 /* Poll infinite value of time */
608 ret = poll(kernel_pollfd, nb_fd, -1);
609 if (ret < 0) {
610 perror("poll kernel thread");
611 goto error;
612 } else if (ret == 0) {
613 /* Should not happen since timeout is infinite */
614 continue;
615 }
616
273ea72c
DG
617 /* Thread quit pipe has been closed. Killing thread. */
618 if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) {
619 goto error;
620 }
621
7a485870
DG
622 DBG("Kernel poll event triggered");
623
624 /*
625 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
626 * must be updated.
627 */
273ea72c 628 switch (kernel_pollfd[nb_fd - 2].revents) {
b5541356 629 case POLLIN:
7a485870
DG
630 ret = read(kernel_poll_pipe[0], &tmp, 1);
631 update_poll_flag = 1;
632 continue;
b5541356
DG
633 case POLLERR:
634 goto error;
635 default:
636 break;
7a485870
DG
637 }
638
639 for (i = 0; i < nb_fd; i++) {
640 switch (kernel_pollfd[i].revents) {
641 /*
642 * New CPU detected by the kernel. Adding kernel stream to kernel
643 * session and updating the kernel consumer
644 */
645 case POLLIN | POLLRDNORM:
646 ret = update_kernel_stream(kernel_pollfd[i].fd);
647 if (ret < 0) {
648 continue;
649 }
650 break;
651 }
652 }
653 }
654
655error:
656 DBG("Kernel thread dying");
657 if (kernel_pollfd) {
658 free(kernel_pollfd);
659 }
273ea72c
DG
660
661 close(kernel_poll_pipe[0]);
662 close(kernel_poll_pipe[1]);
7a485870
DG
663 return NULL;
664}
665
1d4b027a 666/*
d063d709 667 * This thread manage the kconsumerd error sent back to the session daemon.
1d4b027a
DG
668 */
669static void *thread_manage_kconsumerd(void *data)
670{
273ea72c 671 int sock = 0, ret;
1d4b027a 672 enum lttcomm_return_code code;
273ea72c 673 struct pollfd pollfd[2];
1d4b027a
DG
674
675 DBG("[thread] Manage kconsumerd started");
676
677 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
678 if (ret < 0) {
679 goto error;
680 }
681
273ea72c
DG
682 /* First fd is always the quit pipe */
683 pollfd[0].fd = thread_quit_pipe[0];
684
685 /* Apps socket */
686 pollfd[1].fd = kconsumerd_err_sock;
687 pollfd[1].events = POLLIN;
688
689 /* Inifinite blocking call, waiting for transmission */
690 ret = poll(pollfd, 2, -1);
691 if (ret < 0) {
692 perror("poll kconsumerd thread");
693 goto error;
694 }
695
696 /* Thread quit pipe has been closed. Killing thread. */
697 if (pollfd[0].revents == POLLNVAL) {
698 goto error;
699 } else if (pollfd[1].revents == POLLERR) {
700 ERR("Kconsumerd err socket poll error");
701 goto error;
702 }
703
1d4b027a
DG
704 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
705 if (sock < 0) {
706 goto error;
707 }
708
712ea556 709 /* Getting status code from kconsumerd */
1d4b027a
DG
710 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
711 if (ret <= 0) {
712 goto error;
713 }
714
715 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
716 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
717 if (kconsumerd_cmd_sock < 0) {
712ea556 718 sem_post(&kconsumerd_sem);
1d4b027a
DG
719 perror("kconsumerd connect");
720 goto error;
721 }
722 /* Signal condition to tell that the kconsumerd is ready */
723 sem_post(&kconsumerd_sem);
724 DBG("Kconsumerd command socket ready");
725 } else {
6f61d021 726 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
727 lttcomm_get_readable_code(-code));
728 goto error;
729 }
730
712ea556
DG
731 /* Wait for any kconsumerd error */
732 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
733 if (ret <= 0) {
734 ERR("Kconsumerd closed the command socket");
735 goto error;
6f61d021 736 }
1d4b027a 737
712ea556
DG
738 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
739
1d4b027a 740error:
6f61d021 741 DBG("Kconsumerd thread dying");
273ea72c
DG
742 if (kconsumerd_err_sock) {
743 close(kconsumerd_err_sock);
744 }
745 if (kconsumerd_cmd_sock) {
746 close(kconsumerd_cmd_sock);
747 }
748 if (sock) {
749 close(sock);
750 }
751
752 unlink(kconsumerd_err_unix_sock_path);
753 unlink(kconsumerd_cmd_unix_sock_path);
754
755 kconsumerd_pid = 0;
1d4b027a
DG
756 return NULL;
757}
758
759/*
1d4b027a
DG
760 * This thread manage the application socket communication
761 */
762static void *thread_manage_apps(void *data)
763{
273ea72c
DG
764 int sock = 0, ret;
765 struct pollfd pollfd[2];
1d4b027a
DG
766
767 /* TODO: Something more elegant is needed but fine for now */
768 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
769 * for 32-bit vs 64-bit compat processes. */
770 /* replicate in ust with version number */
771 struct {
772 int reg; /* 1:register, 0:unregister */
773 pid_t pid;
774 uid_t uid;
775 } reg_msg;
776
777 DBG("[thread] Manage apps started");
778
779 ret = lttcomm_listen_unix_sock(apps_sock);
780 if (ret < 0) {
781 goto error;
782 }
783
273ea72c
DG
784 /* First fd is always the quit pipe */
785 pollfd[0].fd = thread_quit_pipe[0];
786
787 /* Apps socket */
788 pollfd[1].fd = apps_sock;
789 pollfd[1].events = POLLIN;
790
1d4b027a
DG
791 /* Notify all applications to register */
792 notify_apps(default_global_apps_pipe);
793
794 while (1) {
795 DBG("Accepting application registration");
273ea72c
DG
796
797 /* Inifinite blocking call, waiting for transmission */
798 ret = poll(pollfd, 2, -1);
799 if (ret < 0) {
800 perror("poll apps thread");
801 goto error;
802 }
803
804 /* Thread quit pipe has been closed. Killing thread. */
805 if (pollfd[0].revents == POLLNVAL) {
806 goto error;
807 } else if (pollfd[1].revents == POLLERR) {
808 ERR("Apps socket poll error");
809 goto error;
810 }
811
1d4b027a
DG
812 sock = lttcomm_accept_unix_sock(apps_sock);
813 if (sock < 0) {
814 goto error;
815 }
816
273ea72c
DG
817 /*
818 * Basic recv here to handle the very simple data
1d4b027a
DG
819 * that the libust send to register (reg_msg).
820 */
821 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
822 if (ret < 0) {
823 perror("recv");
824 continue;
825 }
826
827 /* Add application to the global traceable list */
828 if (reg_msg.reg == 1) {
829 /* Registering */
830 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
831 if (ret < 0) {
832 /* register_traceable_app only return an error with
833 * ENOMEM. At this point, we better stop everything.
834 */
835 goto error;
836 }
837 } else {
838 /* Unregistering */
839 unregister_traceable_app(reg_msg.pid);
840 }
841 }
842
843error:
273ea72c
DG
844 DBG("Apps thread dying");
845 if (apps_sock) {
846 close(apps_sock);
847 }
848 if (sock) {
849 close(sock);
850 }
1d4b027a 851
273ea72c 852 unlink(apps_unix_sock_path);
1d4b027a
DG
853 return NULL;
854}
855
8c0faa1d 856/*
d063d709
DG
857 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
858 * exec or it will fails.
8c0faa1d 859 */
693bd40b 860static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
861{
862 int ret;
863
864 /* Setup semaphore */
865 sem_init(&kconsumerd_sem, 0, 0);
866
1d4b027a 867 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
868 if (ret != 0) {
869 perror("pthread_create kconsumerd");
870 goto error;
871 }
872
693bd40b 873 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
874 sem_wait(&kconsumerd_sem);
875
712ea556
DG
876 if (kconsumerd_pid == 0) {
877 ERR("Kconsumerd did not start");
878 goto error;
879 }
880
8c0faa1d
DG
881 return 0;
882
883error:
712ea556 884 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
885 return ret;
886}
887
cf3af59e
MD
888static int join_kconsumerd_thread(void)
889{
890 void *status;
891 int ret;
892
893 if (kconsumerd_pid != 0) {
894 ret = kill(kconsumerd_pid, SIGTERM);
895 if (ret) {
896 ERR("Error killing kconsumerd");
897 return ret;
898 }
899 return pthread_join(kconsumerd_thread, &status);
900 } else {
901 return 0;
902 }
903}
904
8c0faa1d 905/*
d063d709 906 * Fork and exec a kernel consumer daemon (kconsumerd).
8c0faa1d 907 *
d063d709 908 * Return pid if successful else -1.
8c0faa1d 909 */
693bd40b 910static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
911{
912 int ret;
913 pid_t pid;
53086306 914 const char *verbosity;
8c0faa1d 915
c49dc785
DG
916 DBG("Spawning kconsumerd");
917
8c0faa1d
DG
918 pid = fork();
919 if (pid == 0) {
920 /*
921 * Exec kconsumerd.
922 */
31f73cc9 923 if (opt_verbose > 1 || opt_verbose_kconsumerd) {
53086306
DG
924 verbosity = "--verbose";
925 } else {
926 verbosity = "--quiet";
927 }
928 execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL);
8c0faa1d
DG
929 if (errno != 0) {
930 perror("kernel start consumer exec");
931 }
932 exit(EXIT_FAILURE);
933 } else if (pid > 0) {
934 ret = pid;
935 goto error;
936 } else {
937 perror("kernel start consumer fork");
938 ret = -errno;
939 goto error;
940 }
941
942error:
943 return ret;
944}
945
693bd40b 946/*
d063d709 947 * Spawn the kconsumerd daemon and session daemon thread.
693bd40b
DG
948 */
949static int start_kconsumerd(void)
950{
951 int ret;
952
693bd40b 953 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785 954 if (kconsumerd_pid != 0) {
817153bb 955 pthread_mutex_unlock(&kconsumerd_pid_mutex);
c49dc785
DG
956 goto end;
957 }
693bd40b 958
c49dc785
DG
959 ret = spawn_kconsumerd();
960 if (ret < 0) {
961 ERR("Spawning kconsumerd failed");
962 ret = LTTCOMM_KERN_CONSUMER_FAIL;
963 pthread_mutex_unlock(&kconsumerd_pid_mutex);
964 goto error;
693bd40b 965 }
c49dc785
DG
966
967 /* Setting up the global kconsumerd_pid */
968 kconsumerd_pid = ret;
693bd40b
DG
969 pthread_mutex_unlock(&kconsumerd_pid_mutex);
970
6f61d021
DG
971 DBG("Kconsumerd pid %d", ret);
972
693bd40b 973 DBG("Spawning kconsumerd thread");
693bd40b
DG
974 ret = spawn_kconsumerd_thread();
975 if (ret < 0) {
976 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
977 goto error;
978 }
979
c49dc785 980end:
693bd40b
DG
981 return 0;
982
983error:
984 return ret;
985}
986
b73401da 987/*
d063d709 988 * modprobe_kernel_modules
b73401da
DG
989 */
990static int modprobe_kernel_modules(void)
991{
ab147185 992 int ret = 0, i;
b73401da
DG
993 char modprobe[256];
994
ab147185
MD
995 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
996 ret = snprintf(modprobe, sizeof(modprobe),
997 "/sbin/modprobe %s%s",
998 kernel_modules_list[i].required ? "" : "--quiet ",
999 kernel_modules_list[i].name);
b73401da
DG
1000 if (ret < 0) {
1001 perror("snprintf modprobe");
1002 goto error;
1003 }
ab147185 1004 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1005 ret = system(modprobe);
ab147185
MD
1006 if (ret == -1) {
1007 ERR("Unable to launch modprobe for module %s",
1008 kernel_modules_list[i].name);
1009 } else if (kernel_modules_list[i].required
1010 && WEXITSTATUS(ret) != 0) {
1011 ERR("Unable to load module %s",
1012 kernel_modules_list[i].name);
1013 } else {
1014 DBG("Modprobe successfully %s",
1015 kernel_modules_list[i].name);
1016 }
1017 }
1018
1019error:
1020 return ret;
1021}
1022
1023/*
1024 * modprobe_remove_kernel_modules
1025 * Remove modules in reverse load order.
1026 */
1027static int modprobe_remove_kernel_modules(void)
1028{
1029 int ret = 0, i;
1030 char modprobe[256];
1031
1032 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
1033 ret = snprintf(modprobe, sizeof(modprobe),
1034 "/sbin/modprobe --remove --quiet %s",
1035 kernel_modules_list[i].name);
b73401da 1036 if (ret < 0) {
ab147185
MD
1037 perror("snprintf modprobe --remove");
1038 goto error;
1039 }
1040 modprobe[sizeof(modprobe) - 1] = '\0';
1041 ret = system(modprobe);
1042 if (ret == -1) {
1043 ERR("Unable to launch modprobe --remove for module %s",
1044 kernel_modules_list[i].name);
1045 } else if (kernel_modules_list[i].required
1046 && WEXITSTATUS(ret) != 0) {
1047 ERR("Unable to remove module %s",
1048 kernel_modules_list[i].name);
1049 } else {
1050 DBG("Modprobe removal successful %s",
1051 kernel_modules_list[i].name);
b73401da 1052 }
b73401da
DG
1053 }
1054
1055error:
1056 return ret;
1057}
1058
1059/*
d063d709 1060 * mount_debugfs
b73401da
DG
1061 */
1062static int mount_debugfs(char *path)
1063{
1064 int ret;
1065 char *type = "debugfs";
1066
996b65c8 1067 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da
DG
1068 if (ret < 0) {
1069 goto error;
1070 }
1071
1072 ret = mount(type, path, type, 0, NULL);
1073 if (ret < 0) {
1074 perror("mount debugfs");
1075 goto error;
1076 }
1077
1078 DBG("Mounted debugfs successfully at %s", path);
1079
1080error:
1081 return ret;
1082}
1083
8c0faa1d 1084/*
d063d709 1085 * Setup necessary data for kernel tracer action.
8c0faa1d 1086 */
f3ed775e 1087static void init_kernel_tracer(void)
8c0faa1d 1088{
b73401da
DG
1089 int ret;
1090 char *proc_mounts = "/proc/mounts";
1091 char line[256];
1092 char *debugfs_path = NULL, *lttng_path;
1093 FILE *fp;
1094
1095 /* Detect debugfs */
1096 fp = fopen(proc_mounts, "r");
1097 if (fp == NULL) {
1098 ERR("Unable to probe %s", proc_mounts);
1099 goto error;
1100 }
1101
1102 while (fgets(line, sizeof(line), fp) != NULL) {
1103 if (strstr(line, "debugfs") != NULL) {
1104 /* Remove first string */
1105 strtok(line, " ");
1106 /* Dup string here so we can reuse line later on */
1107 debugfs_path = strdup(strtok(NULL, " "));
1108 DBG("Got debugfs path : %s", debugfs_path);
1109 break;
1110 }
1111 }
1112
1113 fclose(fp);
1114
1115 /* Mount debugfs if needded */
1116 if (debugfs_path == NULL) {
1117 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1118 if (ret < 0) {
1119 perror("asprintf debugfs path");
1120 goto error;
1121 }
1122 ret = mount_debugfs(debugfs_path);
1123 if (ret < 0) {
1124 goto error;
1125 }
1126 }
1127
1128 /* Modprobe lttng kernel modules */
1129 ret = modprobe_kernel_modules();
1130 if (ret < 0) {
1131 goto error;
1132 }
1133
1134 /* Setup lttng kernel path */
1135 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1136 if (ret < 0) {
1137 perror("asprintf lttng path");
1138 goto error;
1139 }
1140
1141 /* Open debugfs lttng */
1142 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1143 if (kernel_tracer_fd < 0) {
b73401da
DG
1144 DBG("Failed to open %s", lttng_path);
1145 goto error;
8c0faa1d
DG
1146 }
1147
b73401da
DG
1148 free(lttng_path);
1149 free(debugfs_path);
f3ed775e 1150 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1151 return;
1152
1153error:
1154 if (lttng_path) {
1155 free(lttng_path);
1156 }
1157 if (debugfs_path) {
1158 free(debugfs_path);
1159 }
1160 WARN("No kernel tracer available");
1161 kernel_tracer_fd = 0;
1162 return;
f3ed775e 1163}
33a2b854 1164
f3ed775e 1165/*
d063d709
DG
1166 * Start tracing by creating trace directory and sending FDs to the kernel
1167 * consumer.
f3ed775e
DG
1168 */
1169static int start_kernel_trace(struct ltt_kernel_session *session)
1170{
f40799e8 1171 int ret = 0;
8c0faa1d 1172
f3ed775e
DG
1173 if (session->kconsumer_fds_sent == 0) {
1174 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
1175 if (ret < 0) {
1176 ERR("Send kconsumerd fds failed");
1177 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1178 goto error;
1179 }
1d4b027a 1180
f3ed775e
DG
1181 session->kconsumer_fds_sent = 1;
1182 }
1d4b027a
DG
1183
1184error:
1185 return ret;
8c0faa1d
DG
1186}
1187
7a485870
DG
1188/*
1189 * Notify kernel thread to update it's pollfd.
1190 */
1191static int notify_kernel_pollfd(void)
1192{
1193 int ret;
1194
1195 /* Inform kernel thread of the new kernel channel */
1196 ret = write(kernel_poll_pipe[1], "!", 1);
1197 if (ret < 0) {
1198 perror("write kernel poll pipe");
1199 }
1200
1201 return ret;
1202}
1203
8c0faa1d 1204/*
d063d709 1205 * Allocate a channel structure and fill it.
8c0faa1d 1206 */
ed8f384d 1207static struct lttng_channel *init_default_channel(char *name)
8c0faa1d 1208{
f3ed775e 1209 struct lttng_channel *chan;
1d4b027a 1210
f3ed775e
DG
1211 chan = malloc(sizeof(struct lttng_channel));
1212 if (chan == NULL) {
1213 perror("init channel malloc");
1214 goto error;
8c0faa1d 1215 }
1d4b027a 1216
ed8f384d 1217 if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) {
9f19cc17 1218 perror("snprintf channel name");
f3ed775e
DG
1219 return NULL;
1220 }
1221
1222 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
1223 chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
1224 chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
1225 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
1226 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 1227 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
1d4b027a
DG
1228
1229error:
f3ed775e 1230 return chan;
8c0faa1d
DG
1231}
1232
333f285e 1233/*
d063d709 1234 * Create a kernel tracer session then create the default channel.
333f285e 1235 */
f3ed775e 1236static int create_kernel_session(struct ltt_session *session)
333f285e 1237{
f3ed775e 1238 int ret;
f3ed775e
DG
1239
1240 DBG("Creating kernel session");
1241
1242 ret = kernel_create_session(session, kernel_tracer_fd);
1243 if (ret < 0) {
1244 ret = LTTCOMM_KERN_SESS_FAIL;
1245 goto error;
333f285e
DG
1246 }
1247
996b65c8
MD
1248 ret = mkdir_recursive(session->path, S_IRWXU | S_IRWXG,
1249 geteuid(), allowed_group());
7a485870 1250 if (ret < 0) {
996b65c8 1251 if (ret != -EEXIST) {
7a485870
DG
1252 ERR("Trace directory creation error");
1253 goto error;
1254 }
1255 }
1256
f3ed775e
DG
1257error:
1258 return ret;
333f285e
DG
1259}
1260
6c9cc2ab
DG
1261/*
1262 * Using the session list, filled a lttng_session array to send back to the
1263 * client for session listing.
1264 *
1265 * The session list lock MUST be acquired before calling this function. Use
1266 * lock_session_list() and unlock_session_list().
1267 */
1268static void list_lttng_sessions(struct lttng_session *sessions)
1269{
1270 int i = 0;
1271 struct ltt_session *session;
1272
1273 DBG("Getting all available session");
1274 /*
1275 * Iterate over session list and append data after the control struct in
1276 * the buffer.
1277 */
1278 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1279 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1280 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1281 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1282 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1283 i++;
1284 }
1285}
1286
9f19cc17
DG
1287/*
1288 * Fill lttng_channel array of all channels.
1289 */
1290static void list_lttng_channels(struct ltt_session *session,
1291 struct lttng_channel *channels)
1292{
1293 int i = 0;
1294 struct ltt_kernel_channel *kchan;
1295
1296 DBG("Listing channels for session %s", session->name);
1297
1298 /* Kernel channels */
1299 if (session->kernel_session != NULL) {
1300 cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) {
1301 /* Copy lttng_channel struct to array */
1302 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1303 channels[i].enabled = kchan->enabled;
1304 i++;
1305 }
1306 }
1307
1308 /* TODO: Missing UST listing */
1309}
1310
1311/*
1312 * Fill lttng_event array of all events in the channel.
1313 */
1314static void list_lttng_events(struct ltt_kernel_channel *kchan,
1315 struct lttng_event *events)
1316{
1317 /*
1318 * TODO: This is ONLY kernel. Need UST support.
1319 */
1320 int i = 0;
1321 struct ltt_kernel_event *event;
1322
1323 DBG("Listing events for channel %s", kchan->channel->name);
1324
1325 /* Kernel channels */
1326 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1327 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1328 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1329 events[i].enabled = event->enabled;
1330 switch (event->event->instrumentation) {
1331 case LTTNG_KERNEL_TRACEPOINT:
1332 events[i].type = LTTNG_EVENT_TRACEPOINT;
1333 break;
1334 case LTTNG_KERNEL_KPROBE:
1335 case LTTNG_KERNEL_KRETPROBE:
1336 events[i].type = LTTNG_EVENT_PROBE;
1337 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1338 sizeof(struct lttng_kernel_kprobe));
1339 break;
1340 case LTTNG_KERNEL_FUNCTION:
1341 events[i].type = LTTNG_EVENT_FUNCTION;
1342 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1343 sizeof(struct lttng_kernel_function));
1344 break;
1345 }
1346 i++;
1347 }
1348}
1349
fac6795d 1350/*
d063d709
DG
1351 * Process the command requested by the lttng client within the command
1352 * context structure. This function make sure that the return structure (llm)
1353 * is set and ready for transmission before returning.
fac6795d 1354 *
e065084a 1355 * Return any error encountered or 0 for success.
fac6795d 1356 */
5461b305 1357static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 1358{
f40799e8 1359 int ret = LTTCOMM_OK;
fac6795d 1360
5461b305 1361 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 1362
f3ed775e 1363 /* Listing commands don't need a session */
5461b305 1364 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
1365 case LTTNG_CREATE_SESSION:
1366 case LTTNG_LIST_SESSIONS:
052da939 1367 case LTTNG_LIST_TRACEPOINTS:
d0254c7c 1368 case LTTNG_CALIBRATE:
5e16da05
MD
1369 break;
1370 default:
42abccdb
DG
1371 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
1372 cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name);
5461b305 1373 if (cmd_ctx->session == NULL) {
f3ed775e 1374 /* If session name not found */
42abccdb 1375 if (cmd_ctx->lsm->session.name != NULL) {
f3ed775e
DG
1376 ret = LTTCOMM_SESS_NOT_FOUND;
1377 } else { /* If no session name specified */
1378 ret = LTTCOMM_SELECT_SESS;
1379 }
5461b305 1380 goto error;
b5541356
DG
1381 } else {
1382 /* Acquire lock for the session */
1383 lock_session(cmd_ctx->session);
379473d2 1384 }
5e16da05 1385 break;
379473d2
DG
1386 }
1387
f3ed775e 1388 /*
d0254c7c 1389 * Check domain type for specific "pre-action".
f3ed775e 1390 */
0d0c377a
DG
1391 switch (cmd_ctx->lsm->domain.type) {
1392 case LTTNG_DOMAIN_KERNEL:
333f285e 1393 /* Kernel tracer check */
20fe2104 1394 if (kernel_tracer_fd == 0) {
333f285e
DG
1395 init_kernel_tracer();
1396 if (kernel_tracer_fd == 0) {
1397 ret = LTTCOMM_KERN_NA;
1398 goto error;
1399 }
20fe2104 1400 }
f3ed775e
DG
1401
1402 /* Need a session for kernel command */
d0254c7c
MD
1403 switch (cmd_ctx->lsm->cmd_type) {
1404 case LTTNG_CREATE_SESSION:
1405 case LTTNG_LIST_SESSIONS:
1406 case LTTNG_LIST_TRACEPOINTS:
1407 case LTTNG_CALIBRATE:
1408 break;
1409 default:
1410 if (cmd_ctx->session->kernel_session == NULL) {
1411 ret = create_kernel_session(cmd_ctx->session);
f3ed775e 1412 if (ret < 0) {
d0254c7c 1413 ret = LTTCOMM_KERN_SESS_FAIL;
f3ed775e
DG
1414 goto error;
1415 }
d0254c7c
MD
1416
1417 /* Start the kernel consumer daemon */
1418 if (kconsumerd_pid == 0) {
1419 ret = start_kconsumerd();
1420 if (ret < 0) {
1421 goto error;
1422 }
1423 }
f3ed775e
DG
1424 }
1425 }
0d0c377a
DG
1426 break;
1427 default:
1428 break;
20fe2104
DG
1429 }
1430
fac6795d 1431 /* Process by command type */
5461b305 1432 switch (cmd_ctx->lsm->cmd_type) {
b579acd9 1433 case LTTNG_ADD_CONTEXT:
d65106b1 1434 {
b579acd9 1435 struct lttng_kernel_context kctx;
d65106b1
DG
1436
1437 /* Setup lttng message with no payload */
1438 ret = setup_lttng_msg(cmd_ctx, 0);
1439 if (ret < 0) {
1440 goto setup_error;
1441 }
1442
b579acd9
DG
1443 switch (cmd_ctx->lsm->domain.type) {
1444 case LTTNG_DOMAIN_KERNEL:
1445 /* Create Kernel context */
1446 kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx;
1447 kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type;
1448 kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config;
1449 strncpy(kctx.u.perf_counter.name,
1450 cmd_ctx->lsm->u.context.ctx.u.perf_counter.name,
1451 LTTNG_SYMBOL_NAME_LEN);
99497cd0 1452 kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9
DG
1453
1454 /* Add kernel context to kernel tracer. See context.c */
1455 ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx,
1456 cmd_ctx->lsm->u.context.event_name,
1457 cmd_ctx->lsm->u.context.channel_name);
1458 if (ret != LTTCOMM_OK) {
d65106b1
DG
1459 goto error;
1460 }
b579acd9
DG
1461 break;
1462 default:
1463 /* TODO: Userspace tracing */
1464 ret = LTTCOMM_NOT_IMPLEMENTED;
0b97ec54 1465 goto error;
d65106b1
DG
1466 }
1467
1468 ret = LTTCOMM_OK;
1469 break;
1470 }
0b97ec54 1471 case LTTNG_DISABLE_CHANNEL:
26cc6b4e 1472 {
0b97ec54 1473 struct ltt_kernel_channel *kchan;
26cc6b4e
DG
1474
1475 /* Setup lttng message with no payload */
1476 ret = setup_lttng_msg(cmd_ctx, 0);
1477 if (ret < 0) {
1478 goto setup_error;
1479 }
1480
0b97ec54
DG
1481 switch (cmd_ctx->lsm->domain.type) {
1482 case LTTNG_DOMAIN_KERNEL:
1483 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1484 cmd_ctx->session->kernel_session);
1485 if (kchan == NULL) {
1486 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
26cc6b4e 1487 goto error;
0b97ec54
DG
1488 } else if (kchan->enabled == 1) {
1489 ret = kernel_disable_channel(kchan);
1490 if (ret < 0) {
1491 if (ret != EEXIST) {
1492 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
1493 }
1494 goto error;
1495 }
26cc6b4e 1496 }
0b97ec54
DG
1497 kernel_wait_quiescent(kernel_tracer_fd);
1498 break;
1499 default:
1500 /* TODO: Userspace tracing */
1501 ret = LTTCOMM_NOT_IMPLEMENTED;
1502 goto error;
26cc6b4e
DG
1503 }
1504
26cc6b4e
DG
1505 ret = LTTCOMM_OK;
1506 break;
1507 }
f5177a38 1508 case LTTNG_DISABLE_EVENT:
e953ef25 1509 {
f5177a38
DG
1510 struct ltt_kernel_channel *kchan;
1511 struct ltt_kernel_event *kevent;
e953ef25
DG
1512
1513 /* Setup lttng message with no payload */
1514 ret = setup_lttng_msg(cmd_ctx, 0);
1515 if (ret < 0) {
1516 goto setup_error;
1517 }
1518
f5177a38
DG
1519 switch (cmd_ctx->lsm->domain.type) {
1520 case LTTNG_DOMAIN_KERNEL:
1521 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1522 cmd_ctx->session->kernel_session);
1523 if (kchan == NULL) {
1524 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
19e70852 1525 goto error;
e953ef25 1526 }
f5177a38
DG
1527
1528 kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan);
1529 if (kevent != NULL) {
1530 DBG("Disabling kernel event %s for channel %s.", kevent->event->name,
1531 kchan->channel->name);
1532 ret = kernel_disable_event(kevent);
1533 if (ret < 0) {
1534 ret = LTTCOMM_KERN_ENABLE_FAIL;
1535 goto error;
1536 }
1537 }
1538
1539 kernel_wait_quiescent(kernel_tracer_fd);
1540 break;
1541 default:
1542 /* TODO: Userspace tracing */
1543 ret = LTTCOMM_NOT_IMPLEMENTED;
1544 goto error;
e953ef25
DG
1545 }
1546
19e70852 1547 ret = LTTCOMM_OK;
e953ef25
DG
1548 break;
1549 }
f5177a38 1550 case LTTNG_DISABLE_ALL_EVENT:
950131af 1551 {
f5177a38
DG
1552 struct ltt_kernel_channel *kchan;
1553 struct ltt_kernel_event *kevent;
950131af
DG
1554
1555 /* Setup lttng message with no payload */
1556 ret = setup_lttng_msg(cmd_ctx, 0);
1557 if (ret < 0) {
1558 goto setup_error;
1559 }
1560
f5177a38
DG
1561 switch (cmd_ctx->lsm->domain.type) {
1562 case LTTNG_DOMAIN_KERNEL:
1563 DBG("Disabling all enabled kernel events");
1564 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
1565 cmd_ctx->session->kernel_session);
1566 if (kchan == NULL) {
1567 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1568 goto error;
1569 }
950131af 1570
f5177a38
DG
1571 /* For each event in the kernel session */
1572 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
1573 DBG("Disabling kernel event %s for channel %s.",
1574 kevent->event->name, kchan->channel->name);
1575 ret = kernel_disable_event(kevent);
1576 if (ret < 0) {
1577 continue;
1578 }
950131af 1579 }
f5177a38
DG
1580
1581 /* Quiescent wait after event disable */
1582 kernel_wait_quiescent(kernel_tracer_fd);
1583 break;
1584 default:
1585 /* TODO: Userspace tracing */
1586 ret = LTTCOMM_NOT_IMPLEMENTED;
1587 goto error;
950131af
DG
1588 }
1589
950131af
DG
1590 ret = LTTCOMM_OK;
1591 break;
1592 }
0d0c377a 1593 case LTTNG_ENABLE_CHANNEL:
d36b8583 1594 {
0d0c377a 1595 struct ltt_kernel_channel *kchan;
d36b8583
DG
1596
1597 /* Setup lttng message with no payload */
1598 ret = setup_lttng_msg(cmd_ctx, 0);
1599 if (ret < 0) {
1600 goto setup_error;
1601 }
1602
0d0c377a
DG
1603 switch (cmd_ctx->lsm->domain.type) {
1604 case LTTNG_DOMAIN_KERNEL:
1605 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
1606 cmd_ctx->session->kernel_session);
1607 if (kchan == NULL) {
1608 /* Channel not found, creating it */
1609 DBG("Creating kernel channel");
7d29a247 1610
0d0c377a
DG
1611 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
1612 &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path);
1613 if (ret < 0) {
1614 ret = LTTCOMM_KERN_CHAN_FAIL;
1615 goto error;
1616 }
7d29a247 1617
0d0c377a
DG
1618 /* Notify kernel thread that there is a new channel */
1619 ret = notify_kernel_pollfd();
1620 if (ret < 0) {
1621 ret = LTTCOMM_FATAL;
1622 goto error;
1623 }
1624 } else if (kchan->enabled == 0) {
1625 ret = kernel_enable_channel(kchan);
1626 if (ret < 0) {
1627 if (ret != EEXIST) {
1628 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
1629 }
1630 goto error;
d36b8583 1631 }
d36b8583 1632 }
0d0c377a
DG
1633
1634 kernel_wait_quiescent(kernel_tracer_fd);
1635 break;
1636 default:
1637 /* TODO: Userspace tracing */
1638 ret = LTTCOMM_NOT_IMPLEMENTED;
1639 goto error;
d36b8583
DG
1640 }
1641
d36b8583
DG
1642 ret = LTTCOMM_OK;
1643 break;
1644 }
0d0c377a 1645 case LTTNG_ENABLE_EVENT:
894be886 1646 {
7d29a247
DG
1647 char *channel_name;
1648 struct ltt_kernel_channel *kchan;
0d0c377a 1649 struct ltt_kernel_event *kevent;
7d29a247 1650 struct lttng_channel *chan;
f3ed775e 1651
894be886
DG
1652 /* Setup lttng message with no payload */
1653 ret = setup_lttng_msg(cmd_ctx, 0);
1654 if (ret < 0) {
1655 goto setup_error;
1656 }
1657
7d29a247
DG
1658 channel_name = cmd_ctx->lsm->u.enable.channel_name;
1659
0d0c377a
DG
1660 switch (cmd_ctx->lsm->domain.type) {
1661 case LTTNG_DOMAIN_KERNEL:
1662 do {
1663 kchan = get_kernel_channel_by_name(channel_name,
1664 cmd_ctx->session->kernel_session);
1665 if (kchan == NULL) {
1666 DBG("Channel not found. Creating channel %s", channel_name);
1667
1668 chan = init_default_channel(channel_name);
1669 if (chan == NULL) {
1670 ret = LTTCOMM_FATAL;
1671 goto error;
1672 }
7d29a247 1673
0d0c377a
DG
1674 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
1675 chan, cmd_ctx->session->path);
1676 if (ret < 0) {
1677 ret = LTTCOMM_KERN_CHAN_FAIL;
1678 goto error;
1679 }
7d29a247 1680 }
0d0c377a 1681 } while (kchan == NULL);
7d29a247 1682
0d0c377a
DG
1683 kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan);
1684 if (kevent == NULL) {
1685 DBG("Creating kernel event %s for channel %s.",
1686 cmd_ctx->lsm->u.enable.event.name, channel_name);
1687 ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan);
1688 } else {
1689 DBG("Enabling kernel event %s for channel %s.",
1690 kevent->event->name, channel_name);
1691 ret = kernel_enable_event(kevent);
1692 if (ret == -EEXIST) {
1693 ret = LTTCOMM_KERN_EVENT_EXIST;
7d29a247
DG
1694 goto error;
1695 }
1696 }
f34daff7 1697
0d0c377a
DG
1698 if (ret < 0) {
1699 ret = LTTCOMM_KERN_ENABLE_FAIL;
7d29a247
DG
1700 goto error;
1701 }
19e70852 1702
0d0c377a
DG
1703 kernel_wait_quiescent(kernel_tracer_fd);
1704 break;
1705 default:
1706 /* TODO: Userspace tracing */
1707 ret = LTTCOMM_NOT_IMPLEMENTED;
19e70852 1708 goto error;
f3ed775e 1709 }
19e70852 1710 ret = LTTCOMM_OK;
894be886
DG
1711 break;
1712 }
0d0c377a 1713 case LTTNG_ENABLE_ALL_EVENT:
33a2b854 1714 {
9f19cc17
DG
1715 int size, i;
1716 char *channel_name;
7d29a247 1717 struct ltt_kernel_channel *kchan;
0d0c377a 1718 struct ltt_kernel_event *kevent;
9f19cc17 1719 struct lttng_event *event_list;
7d29a247 1720 struct lttng_channel *chan;
33a2b854
DG
1721
1722 /* Setup lttng message with no payload */
1723 ret = setup_lttng_msg(cmd_ctx, 0);
1724 if (ret < 0) {
1725 goto setup_error;
1726 }
1727
1728 DBG("Enabling all kernel event");
1729
7d29a247
DG
1730 channel_name = cmd_ctx->lsm->u.enable.channel_name;
1731
0d0c377a
DG
1732 switch (cmd_ctx->lsm->domain.type) {
1733 case LTTNG_DOMAIN_KERNEL:
1734 do {
1735 kchan = get_kernel_channel_by_name(channel_name,
1736 cmd_ctx->session->kernel_session);
1737 if (kchan == NULL) {
1738 DBG("Channel not found. Creating channel %s", channel_name);
1739
1740 chan = init_default_channel(channel_name);
1741 if (chan == NULL) {
1742 ret = LTTCOMM_FATAL;
1743 goto error;
1744 }
7d29a247 1745
0d0c377a
DG
1746 ret = kernel_create_channel(cmd_ctx->session->kernel_session,
1747 chan, cmd_ctx->session->path);
1748 if (ret < 0) {
1749 ret = LTTCOMM_KERN_CHAN_FAIL;
1750 goto error;
1751 }
7d29a247 1752 }
0d0c377a 1753 } while (kchan == NULL);
7d29a247 1754
0d0c377a
DG
1755 /* For each event in the kernel session */
1756 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
1757 DBG("Enabling kernel event %s for channel %s.",
1758 kevent->event->name, channel_name);
1759 ret = kernel_enable_event(kevent);
7d29a247 1760 if (ret < 0) {
0d0c377a 1761 continue;
7d29a247
DG
1762 }
1763 }
33a2b854 1764
0d0c377a
DG
1765 size = kernel_list_events(kernel_tracer_fd, &event_list);
1766 if (size < 0) {
1767 ret = LTTCOMM_KERN_LIST_FAIL;
1768 goto error;
f3ed775e 1769 }
f3ed775e 1770
0d0c377a
DG
1771 for (i = 0; i < size; i++) {
1772 kevent = get_kernel_event_by_name(event_list[i].name, kchan);
1773 if (kevent == NULL) {
1774 /* Default event type for enable all */
1775 event_list[i].type = LTTNG_EVENT_TRACEPOINT;
1776 /* Enable each single tracepoint event */
1777 ret = kernel_create_event(&event_list[i], kchan);
1778 if (ret < 0) {
1779 /* Ignore error here and continue */
1780 }
950131af 1781 }
33a2b854 1782 }
33a2b854 1783
0d0c377a
DG
1784 free(event_list);
1785
1786 /* Quiescent wait after event enable */
1787 kernel_wait_quiescent(kernel_tracer_fd);
1788 break;
1789 default:
1790 /* TODO: Userspace tracing */
1791 ret = LTTCOMM_NOT_IMPLEMENTED;
1792 goto error;
1793 }
33a2b854
DG
1794
1795 ret = LTTCOMM_OK;
1796 break;
1797 }
052da939 1798 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 1799 {
9f19cc17 1800 struct lttng_event *events;
052da939
DG
1801 ssize_t nb_events = 0;
1802
1803 switch (cmd_ctx->lsm->domain.type) {
1804 case LTTNG_DOMAIN_KERNEL:
1805 DBG("Listing kernel events");
1806 nb_events = kernel_list_events(kernel_tracer_fd, &events);
1807 if (nb_events < 0) {
1808 ret = LTTCOMM_KERN_LIST_FAIL;
1809 goto error;
1810 }
1811 break;
1812 default:
1813 /* TODO: Userspace listing */
1814 ret = LTTCOMM_NOT_IMPLEMENTED;
1815 break;
2ef84c95
DG
1816 }
1817
1818 /*
1819 * Setup lttng message with payload size set to the event list size in
1820 * bytes and then copy list into the llm payload.
1821 */
052da939 1822 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 1823 if (ret < 0) {
052da939 1824 free(events);
2ef84c95
DG
1825 goto setup_error;
1826 }
1827
1828 /* Copy event list into message payload */
9f19cc17 1829 memcpy(cmd_ctx->llm->payload, events,
052da939 1830 sizeof(struct lttng_event) * nb_events);
2ef84c95 1831
9f19cc17 1832 free(events);
2ef84c95
DG
1833
1834 ret = LTTCOMM_OK;
1835 break;
1836 }
f3ed775e 1837 case LTTNG_START_TRACE:
8c0faa1d
DG
1838 {
1839 struct ltt_kernel_channel *chan;
f3ed775e 1840
8c0faa1d
DG
1841 /* Setup lttng message with no payload */
1842 ret = setup_lttng_msg(cmd_ctx, 0);
1843 if (ret < 0) {
1844 goto setup_error;
1845 }
1846
f3ed775e
DG
1847 /* Kernel tracing */
1848 if (cmd_ctx->session->kernel_session != NULL) {
1849 if (cmd_ctx->session->kernel_session->metadata == NULL) {
1850 DBG("Open kernel metadata");
58a97671
DG
1851 ret = kernel_open_metadata(cmd_ctx->session->kernel_session,
1852 cmd_ctx->session->path);
f3ed775e
DG
1853 if (ret < 0) {
1854 ret = LTTCOMM_KERN_META_FAIL;
1855 goto error;
1856 }
1857 }
8c0faa1d 1858
f3ed775e
DG
1859 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1860 DBG("Opening kernel metadata stream");
1861 if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
1862 ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
1863 if (ret < 0) {
1864 ERR("Kernel create metadata stream failed");
1865 ret = LTTCOMM_KERN_STREAM_FAIL;
1866 goto error;
1867 }
1868 }
1869 }
8c0faa1d 1870
f3ed775e 1871 /* For each channel */
0d0c377a
DG
1872 cds_list_for_each_entry(chan,
1873 &cmd_ctx->session->kernel_session->channel_list.head, list) {
f3ed775e
DG
1874 if (chan->stream_count == 0) {
1875 ret = kernel_open_channel_stream(chan);
1876 if (ret < 0) {
1877 ERR("Kernel create channel stream failed");
1878 ret = LTTCOMM_KERN_STREAM_FAIL;
1879 goto error;
1880 }
1881 /* Update the stream global counter */
1882 cmd_ctx->session->kernel_session->stream_count_global += ret;
1883 }
1884 }
1885
1886 DBG("Start kernel tracing");
1887 ret = kernel_start_session(cmd_ctx->session->kernel_session);
8c0faa1d 1888 if (ret < 0) {
f3ed775e
DG
1889 ERR("Kernel start session failed");
1890 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1891 goto error;
1892 }
8c0faa1d 1893
f3ed775e
DG
1894 ret = start_kernel_trace(cmd_ctx->session->kernel_session);
1895 if (ret < 0) {
1896 ret = LTTCOMM_KERN_START_FAIL;
8c0faa1d
DG
1897 goto error;
1898 }
8c0faa1d 1899
f3ed775e
DG
1900 /* Quiescent wait after starting trace */
1901 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1902 }
1903
f3ed775e 1904 /* TODO: Start all UST traces */
8c0faa1d
DG
1905
1906 ret = LTTCOMM_OK;
1907 break;
1908 }
f3ed775e 1909 case LTTNG_STOP_TRACE:
8c0faa1d 1910 {
f3ed775e 1911 struct ltt_kernel_channel *chan;
8c0faa1d
DG
1912 /* Setup lttng message with no payload */
1913 ret = setup_lttng_msg(cmd_ctx, 0);
1914 if (ret < 0) {
1915 goto setup_error;
1916 }
1917
f3ed775e
DG
1918 /* Kernel tracer */
1919 if (cmd_ctx->session->kernel_session != NULL) {
1920 DBG("Stop kernel tracing");
84291629 1921
f3ed775e
DG
1922 ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
1923 if (ret < 0) {
1924 ERR("Kernel metadata flush failed");
1925 }
8c0faa1d 1926
f3ed775e
DG
1927 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
1928 ret = kernel_flush_buffer(chan);
1929 if (ret < 0) {
1930 ERR("Kernel flush buffer error");
1931 }
1932 }
1933
1934 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
1935 if (ret < 0) {
1936 ERR("Kernel stop session failed");
1937 ret = LTTCOMM_KERN_STOP_FAIL;
1938 goto error;
1939 }
1940
1941 /* Quiescent wait after stopping trace */
1942 kernel_wait_quiescent(kernel_tracer_fd);
8c0faa1d
DG
1943 }
1944
f3ed775e 1945 /* TODO : User-space tracer */
8c0faa1d
DG
1946
1947 ret = LTTCOMM_OK;
1948 break;
1949 }
5e16da05
MD
1950 case LTTNG_CREATE_SESSION:
1951 {
5461b305
DG
1952 /* Setup lttng message with no payload */
1953 ret = setup_lttng_msg(cmd_ctx, 0);
1954 if (ret < 0) {
1955 goto setup_error;
1956 }
1957
42abccdb 1958 ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path);
5e16da05 1959 if (ret < 0) {
f3ed775e 1960 if (ret == -EEXIST) {
5e16da05
MD
1961 ret = LTTCOMM_EXIST_SESS;
1962 } else {
aaf97519 1963 ret = LTTCOMM_FATAL;
aaf97519 1964 }
5461b305 1965 goto error;
8028d920 1966 }
1657e9bb 1967
5461b305 1968 ret = LTTCOMM_OK;
5e16da05
MD
1969 break;
1970 }
1971 case LTTNG_DESTROY_SESSION:
1972 {
5461b305
DG
1973 /* Setup lttng message with no payload */
1974 ret = setup_lttng_msg(cmd_ctx, 0);
1975 if (ret < 0) {
1976 goto setup_error;
1977 }
1978
f3ed775e
DG
1979 /* Clean kernel session teardown */
1980 teardown_kernel_session(cmd_ctx->session);
1981
42abccdb 1982 ret = destroy_session(cmd_ctx->lsm->session.name);
5e16da05 1983 if (ret < 0) {
f3ed775e 1984 ret = LTTCOMM_FATAL;
5461b305 1985 goto error;
5e16da05 1986 }
1657e9bb 1987
7a485870
DG
1988 /*
1989 * Must notify the kernel thread here to update it's pollfd in order to
1990 * remove the channel(s)' fd just destroyed.
1991 */
1992 ret = notify_kernel_pollfd();
1993 if (ret < 0) {
1994 ret = LTTCOMM_FATAL;
1995 goto error;
1996 }
1997
5461b305
DG
1998 ret = LTTCOMM_OK;
1999 break;
5e16da05 2000 }
9f19cc17 2001 case LTTNG_LIST_DOMAINS:
5e16da05 2002 {
4b222185 2003 size_t nb_dom = 0;
5461b305 2004
9f19cc17
DG
2005 if (cmd_ctx->session->kernel_session != NULL) {
2006 nb_dom++;
ce3d728c 2007 }
520ff687 2008
9f19cc17
DG
2009 nb_dom += cmd_ctx->session->ust_trace_count;
2010
2011 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom);
5461b305
DG
2012 if (ret < 0) {
2013 goto setup_error;
520ff687 2014 }
57167058 2015
9f19cc17
DG
2016 ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type =
2017 LTTNG_DOMAIN_KERNEL;
5e16da05 2018
9f19cc17 2019 /* TODO: User-space tracer domain support */
5461b305 2020 ret = LTTCOMM_OK;
5e16da05
MD
2021 break;
2022 }
9f19cc17 2023 case LTTNG_LIST_CHANNELS:
5e16da05 2024 {
9f19cc17
DG
2025 /*
2026 * TODO: Only kernel channels are listed here. UST listing
2027 * is needed on lttng-ust 2.0 release.
2028 */
2029 size_t nb_chan = 0;
2030 if (cmd_ctx->session->kernel_session != NULL) {
2031 nb_chan += cmd_ctx->session->kernel_session->channel_count;
5461b305 2032 }
ca95a216 2033
9f19cc17
DG
2034 ret = setup_lttng_msg(cmd_ctx,
2035 sizeof(struct lttng_channel) * nb_chan);
5461b305
DG
2036 if (ret < 0) {
2037 goto setup_error;
2038 }
9f19cc17
DG
2039
2040 list_lttng_channels(cmd_ctx->session,
2041 (struct lttng_channel *)(cmd_ctx->llm->payload));
2042
2043 ret = LTTCOMM_OK;
5461b305 2044 break;
5e16da05 2045 }
9f19cc17 2046 case LTTNG_LIST_EVENTS:
5e16da05 2047 {
9f19cc17
DG
2048 /*
2049 * TODO: Only kernel events are listed here. UST listing
2050 * is needed on lttng-ust 2.0 release.
2051 */
2052 size_t nb_event = 0;
2053 struct ltt_kernel_channel *kchan = NULL;
2054
2055 if (cmd_ctx->session->kernel_session != NULL) {
2056 kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name,
2057 cmd_ctx->session->kernel_session);
2058 if (kchan == NULL) {
2059 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2060 goto error;
2061 }
2062 nb_event += kchan->event_count;
5461b305 2063 }
ca95a216 2064
9f19cc17
DG
2065 ret = setup_lttng_msg(cmd_ctx,
2066 sizeof(struct lttng_event) * nb_event);
5461b305
DG
2067 if (ret < 0) {
2068 goto setup_error;
2069 }
9f19cc17 2070
ced2f820 2071 DBG("Listing events (%zu events)", nb_event);
9f19cc17
DG
2072
2073 list_lttng_events(kchan,
2074 (struct lttng_event *)(cmd_ctx->llm->payload));
2075
2076 ret = LTTCOMM_OK;
5461b305 2077 break;
5e16da05
MD
2078 }
2079 case LTTNG_LIST_SESSIONS:
2080 {
6c9cc2ab 2081 lock_session_list();
5461b305 2082
6c9cc2ab 2083 if (session_list_ptr->count == 0) {
f3ed775e 2084 ret = LTTCOMM_NO_SESSION;
36a83748 2085 unlock_session_list();
5461b305 2086 goto error;
57167058 2087 }
5e16da05 2088
6c9cc2ab
DG
2089 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2090 session_list_ptr->count);
5461b305 2091 if (ret < 0) {
36a83748 2092 unlock_session_list();
5461b305 2093 goto setup_error;
e065084a 2094 }
5e16da05 2095
6c9cc2ab
DG
2096 /* Filled the session array */
2097 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2098
2099 unlock_session_list();
5e16da05 2100
5461b305 2101 ret = LTTCOMM_OK;
5e16da05
MD
2102 break;
2103 }
d0254c7c
MD
2104
2105 case LTTNG_CALIBRATE:
2106 {
2107 /* Setup lttng message with no payload */
2108 ret = setup_lttng_msg(cmd_ctx, 0);
2109 if (ret < 0) {
2110 goto setup_error;
2111 }
2112
2113 switch (cmd_ctx->lsm->domain.type) {
2114 case LTTNG_DOMAIN_KERNEL:
2115 {
2116 struct lttng_kernel_calibrate kcalibrate;
2117
2118 kcalibrate.type = cmd_ctx->lsm->u.calibrate.type;
2119 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2120 if (ret < 0) {
2121 ret = LTTCOMM_KERN_ENABLE_FAIL;
2122 goto error;
2123 }
2124 break;
2125 }
2126 default:
2127 /* TODO: Userspace tracing */
2128 ret = LTTCOMM_NOT_IMPLEMENTED;
2129 goto error;
2130 }
2131 ret = LTTCOMM_OK;
2132 break;
2133 }
2134
5e16da05
MD
2135 default:
2136 /* Undefined command */
5461b305
DG
2137 ret = setup_lttng_msg(cmd_ctx, 0);
2138 if (ret < 0) {
2139 goto setup_error;
2140 }
2141
5e16da05 2142 ret = LTTCOMM_UND;
5461b305 2143 break;
fac6795d
DG
2144 }
2145
5461b305
DG
2146 /* Set return code */
2147 cmd_ctx->llm->ret_code = ret;
ca95a216 2148
b5541356
DG
2149 if (cmd_ctx->session) {
2150 unlock_session(cmd_ctx->session);
2151 }
2152
e065084a
DG
2153 return ret;
2154
5461b305 2155error:
5461b305
DG
2156 if (cmd_ctx->llm == NULL) {
2157 DBG("Missing llm structure. Allocating one.");
894be886 2158 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2159 goto setup_error;
2160 }
2161 }
e065084a 2162 /* Notify client of error */
5461b305 2163 cmd_ctx->llm->ret_code = ret;
e065084a 2164
5461b305 2165setup_error:
b5541356
DG
2166 if (cmd_ctx->session) {
2167 unlock_session(cmd_ctx->session);
2168 }
8028d920 2169 return ret;
fac6795d
DG
2170}
2171
1d4b027a 2172/*
d063d709
DG
2173 * This thread manage all clients request using the unix client socket for
2174 * communication.
1d4b027a
DG
2175 */
2176static void *thread_manage_clients(void *data)
2177{
273ea72c
DG
2178 int sock = 0, ret;
2179 struct command_ctx *cmd_ctx = NULL;
2180 struct pollfd pollfd[2];
1d4b027a
DG
2181
2182 DBG("[thread] Manage client started");
2183
2184 ret = lttcomm_listen_unix_sock(client_sock);
2185 if (ret < 0) {
2186 goto error;
2187 }
2188
273ea72c
DG
2189 /* First fd is always the quit pipe */
2190 pollfd[0].fd = thread_quit_pipe[0];
2191
2192 /* Apps socket */
2193 pollfd[1].fd = client_sock;
2194 pollfd[1].events = POLLIN;
2195
1d4b027a
DG
2196 /* Notify parent pid that we are ready
2197 * to accept command for client side.
2198 */
2199 if (opt_sig_parent) {
2200 kill(ppid, SIGCHLD);
2201 }
2202
2203 while (1) {
1d4b027a 2204 DBG("Accepting client command ...");
273ea72c
DG
2205
2206 /* Inifinite blocking call, waiting for transmission */
2207 ret = poll(pollfd, 2, -1);
2208 if (ret < 0) {
2209 perror("poll client thread");
2210 goto error;
2211 }
2212
2213 /* Thread quit pipe has been closed. Killing thread. */
2214 if (pollfd[0].revents == POLLNVAL) {
2215 goto error;
2216 } else if (pollfd[1].revents == POLLERR) {
2217 ERR("Client socket poll error");
2218 goto error;
2219 }
2220
1d4b027a
DG
2221 sock = lttcomm_accept_unix_sock(client_sock);
2222 if (sock < 0) {
2223 goto error;
2224 }
2225
2226 /* Allocate context command to process the client request */
2227 cmd_ctx = malloc(sizeof(struct command_ctx));
2228
2229 /* Allocate data buffer for reception */
2230 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2231 cmd_ctx->llm = NULL;
2232 cmd_ctx->session = NULL;
2233
2234 /*
2235 * Data is received from the lttng client. The struct
2236 * lttcomm_session_msg (lsm) contains the command and data request of
2237 * the client.
2238 */
2239 DBG("Receiving data from client ...");
2240 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
2241 if (ret <= 0) {
2242 continue;
2243 }
2244
f7776ea7
DG
2245 // TODO: Validate cmd_ctx including sanity check for security purpose.
2246
1d4b027a
DG
2247 /*
2248 * This function dispatch the work to the kernel or userspace tracer
2249 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2250 * informations for the client. The command context struct contains
2251 * everything this function may needs.
2252 */
2253 ret = process_client_msg(cmd_ctx);
2254 if (ret < 0) {
2255 /* TODO: Inform client somehow of the fatal error. At this point,
2256 * ret < 0 means that a malloc failed (ENOMEM). */
2257 /* Error detected but still accept command */
a2fb29a5 2258 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2259 continue;
2260 }
2261
2262 DBG("Sending response (size: %d, retcode: %d)",
2263 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
2264 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
2265 if (ret < 0) {
2266 ERR("Failed to send data back to client");
2267 }
2268
a2fb29a5 2269 clean_command_ctx(&cmd_ctx);
d6e4fca4
DG
2270
2271 /* End of transmission */
2272 close(sock);
1d4b027a
DG
2273 }
2274
2275error:
273ea72c
DG
2276 DBG("Client thread dying");
2277 if (client_sock) {
2278 close(client_sock);
2279 }
2280 if (sock) {
2281 close(sock);
2282 }
2283
2284 unlink(client_unix_sock_path);
2285
a2fb29a5 2286 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2287 return NULL;
2288}
2289
2290
fac6795d
DG
2291/*
2292 * usage function on stderr
2293 */
2294static void usage(void)
2295{
b716ce68 2296 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
2297 fprintf(stderr, " -h, --help Display this usage.\n");
2298 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
2299 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2300 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2301 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2302 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
2303 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2304 fprintf(stderr, " -V, --version Show version number.\n");
2305 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2306 fprintf(stderr, " -q, --quiet No output at all.\n");
2307 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 2308 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
2309}
2310
2311/*
2312 * daemon argument parsing
2313 */
2314static int parse_args(int argc, char **argv)
2315{
2316 int c;
2317
2318 static struct option long_options[] = {
2319 { "client-sock", 1, 0, 'c' },
2320 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
2321 { "kconsumerd-cmd-sock", 1, 0, 0 },
2322 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 2323 { "daemonize", 0, 0, 'd' },
5b8719f5 2324 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
2325 { "help", 0, 0, 'h' },
2326 { "group", 1, 0, 'g' },
2327 { "version", 0, 0, 'V' },
75462a81 2328 { "quiet", 0, 0, 'q' },
3f9947db 2329 { "verbose", 0, 0, 'v' },
31f73cc9 2330 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
2331 { NULL, 0, 0, 0 }
2332 };
2333
2334 while (1) {
2335 int option_index = 0;
31f73cc9 2336 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index);
fac6795d
DG
2337 if (c == -1) {
2338 break;
2339 }
2340
2341 switch (c) {
2342 case 0:
2343 fprintf(stderr, "option %s", long_options[option_index].name);
2344 if (optarg) {
2345 fprintf(stderr, " with arg %s\n", optarg);
2346 }
2347 break;
b716ce68 2348 case 'c':
fac6795d
DG
2349 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
2350 break;
2351 case 'a':
2352 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
2353 break;
2354 case 'd':
2355 opt_daemon = 1;
2356 break;
2357 case 'g':
2358 opt_tracing_group = strdup(optarg);
2359 break;
2360 case 'h':
2361 usage();
2362 exit(EXIT_FAILURE);
2363 case 'V':
2364 fprintf(stdout, "%s\n", VERSION);
2365 exit(EXIT_SUCCESS);
5b8719f5
DG
2366 case 'S':
2367 opt_sig_parent = 1;
2368 break;
d6f42150
DG
2369 case 'E':
2370 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
2371 break;
2372 case 'C':
2373 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
2374 break;
75462a81
DG
2375 case 'q':
2376 opt_quiet = 1;
2377 break;
3f9947db 2378 case 'v':
53086306
DG
2379 /* Verbose level can increase using multiple -v */
2380 opt_verbose += 1;
3f9947db 2381 break;
31f73cc9
MD
2382 case 'Z':
2383 opt_verbose_kconsumerd += 1;
2384 break;
fac6795d
DG
2385 default:
2386 /* Unknown option or other error.
2387 * Error is printed by getopt, just return */
2388 return -1;
2389 }
2390 }
2391
2392 return 0;
2393}
2394
2395/*
d063d709 2396 * Creates the two needed socket by the daemon.
d6f42150
DG
2397 * apps_sock - The communication socket for all UST apps.
2398 * client_sock - The communication of the cli tool (lttng).
fac6795d 2399 */
cf3af59e 2400static int init_daemon_socket(void)
fac6795d
DG
2401{
2402 int ret = 0;
2403 mode_t old_umask;
2404
2405 old_umask = umask(0);
2406
2407 /* Create client tool unix socket */
d6f42150
DG
2408 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
2409 if (client_sock < 0) {
2410 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
2411 ret = -1;
2412 goto end;
2413 }
2414
2415 /* File permission MUST be 660 */
2416 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2417 if (ret < 0) {
d6f42150 2418 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
2419 perror("chmod");
2420 goto end;
2421 }
2422
2423 /* Create the application unix socket */
d6f42150
DG
2424 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
2425 if (apps_sock < 0) {
2426 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
2427 ret = -1;
2428 goto end;
2429 }
2430
d6f42150 2431 /* File permission MUST be 666 */
fac6795d
DG
2432 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
2433 if (ret < 0) {
d6f42150 2434 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
2435 perror("chmod");
2436 goto end;
2437 }
2438
2439end:
2440 umask(old_umask);
2441 return ret;
2442}
2443
2444/*
7d8234d9
MD
2445 * Check if the global socket is available, and if a daemon is answering
2446 * at the other side. If yes, error is returned.
fac6795d 2447 */
cf3af59e 2448static int check_existing_daemon(void)
fac6795d 2449{
7d8234d9
MD
2450 if (access(client_unix_sock_path, F_OK) < 0 &&
2451 access(apps_unix_sock_path, F_OK) < 0)
2452 return 0;
2453 /* Is there anybody out there ? */
2454 if (lttng_session_daemon_alive())
2455 return -EEXIST;
2456 else
2457 return 0;
fac6795d
DG
2458}
2459
fac6795d 2460/*
d063d709 2461 * Set the tracing group gid onto the client socket.
5e16da05 2462 *
d063d709
DG
2463 * Race window between mkdir and chown is OK because we are going from more
2464 * permissive (root.root) to les permissive (root.tracing).
fac6795d 2465 */
d6f42150 2466static int set_permissions(void)
fac6795d
DG
2467{
2468 int ret;
996b65c8 2469 gid_t gid;
fac6795d 2470
996b65c8
MD
2471 gid = allowed_group();
2472 if (gid < 0) {
a463f419
DG
2473 if (is_root) {
2474 WARN("No tracing group detected");
2475 ret = 0;
2476 } else {
2477 ERR("Missing tracing group. Aborting execution.");
2478 ret = -1;
2479 }
fac6795d
DG
2480 goto end;
2481 }
2482
d6f42150 2483 /* Set lttng run dir */
996b65c8 2484 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
2485 if (ret < 0) {
2486 ERR("Unable to set group on " LTTNG_RUNDIR);
2487 perror("chown");
2488 }
2489
2490 /* lttng client socket path */
996b65c8 2491 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 2492 if (ret < 0) {
d6f42150
DG
2493 ERR("Unable to set group on %s", client_unix_sock_path);
2494 perror("chown");
2495 }
2496
2497 /* kconsumerd error socket path */
996b65c8 2498 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
2499 if (ret < 0) {
2500 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
2501 perror("chown");
2502 }
2503
d6f42150 2504 DBG("All permissions are set");
e07ae692 2505
fac6795d
DG
2506end:
2507 return ret;
2508}
2509
7a485870 2510/*
d063d709 2511 * Create the pipe used to wake up the kernel thread.
7a485870
DG
2512 */
2513static int create_kernel_poll_pipe(void)
2514{
2515 return pipe2(kernel_poll_pipe, O_CLOEXEC);
2516}
2517
d6f42150 2518/*
d063d709 2519 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
2520 */
2521static int create_lttng_rundir(void)
2522{
2523 int ret;
2524
2525 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
2526 if (ret < 0) {
b1f11e69
DG
2527 if (errno != EEXIST) {
2528 ERR("Unable to create " LTTNG_RUNDIR);
2529 goto error;
2530 } else {
2531 ret = 0;
2532 }
d6f42150
DG
2533 }
2534
2535error:
2536 return ret;
2537}
2538
2539/*
d063d709
DG
2540 * Setup sockets and directory needed by the kconsumerd communication with the
2541 * session daemon.
d6f42150
DG
2542 */
2543static int set_kconsumerd_sockets(void)
2544{
2545 int ret;
2546
2547 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
2548 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
2549 }
2550
2551 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
2552 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
2553 }
2554
2555 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
2556 if (ret < 0) {
6beb2242
DG
2557 if (errno != EEXIST) {
2558 ERR("Failed to create " KCONSUMERD_PATH);
2559 goto error;
2560 }
2561 ret = 0;
d6f42150
DG
2562 }
2563
2564 /* Create the kconsumerd error unix socket */
2565 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
2566 if (kconsumerd_err_sock < 0) {
2567 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
2568 ret = -1;
2569 goto error;
2570 }
2571
2572 /* File permission MUST be 660 */
2573 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2574 if (ret < 0) {
2575 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
2576 perror("chmod");
2577 goto error;
2578 }
2579
2580error:
2581 return ret;
2582}
2583
fac6795d 2584/*
d063d709 2585 * Signal handler for the daemon
cf3af59e
MD
2586 *
2587 * Simply stop all worker threads, leaving main() return gracefully
2588 * after joining all threads and calling cleanup().
fac6795d
DG
2589 */
2590static void sighandler(int sig)
2591{
2592 switch (sig) {
cf3af59e
MD
2593 case SIGPIPE:
2594 DBG("SIGPIPE catched");
2595 return;
2596 case SIGINT:
2597 DBG("SIGINT catched");
2598 stop_threads();
2599 break;
2600 case SIGTERM:
2601 DBG("SIGTERM catched");
2602 stop_threads();
2603 break;
2604 default:
2605 break;
fac6795d 2606 }
fac6795d
DG
2607}
2608
2609/*
d063d709 2610 * Setup signal handler for :
1d4b027a 2611 * SIGINT, SIGTERM, SIGPIPE
fac6795d 2612 */
1d4b027a 2613static int set_signal_handler(void)
fac6795d 2614{
1d4b027a
DG
2615 int ret = 0;
2616 struct sigaction sa;
2617 sigset_t sigset;
fac6795d 2618
1d4b027a
DG
2619 if ((ret = sigemptyset(&sigset)) < 0) {
2620 perror("sigemptyset");
2621 return ret;
2622 }
d6f42150 2623
1d4b027a
DG
2624 sa.sa_handler = sighandler;
2625 sa.sa_mask = sigset;
2626 sa.sa_flags = 0;
2627 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
2628 perror("sigaction");
2629 return ret;
d6f42150
DG
2630 }
2631
1d4b027a
DG
2632 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
2633 perror("sigaction");
2634 return ret;
d6f42150 2635 }
aaf26714 2636
1d4b027a
DG
2637 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
2638 perror("sigaction");
2639 return ret;
8c0faa1d
DG
2640 }
2641
1d4b027a
DG
2642 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2643
2644 return ret;
fac6795d
DG
2645}
2646
f3ed775e 2647/*
d063d709
DG
2648 * Set open files limit to unlimited. This daemon can open a large number of
2649 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
2650 */
2651static void set_ulimit(void)
2652{
2653 int ret;
2654 struct rlimit lim;
2655
a88df331 2656 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
2657 lim.rlim_cur = 65535;
2658 lim.rlim_max = 65535;
2659
2660 ret = setrlimit(RLIMIT_NOFILE, &lim);
2661 if (ret < 0) {
2662 perror("failed to set open files limit");
2663 }
2664}
2665
fac6795d
DG
2666/*
2667 * main
2668 */
2669int main(int argc, char **argv)
2670{
fac6795d
DG
2671 int ret = 0;
2672 void *status;
b082db07 2673 const char *home_path;
fac6795d 2674
273ea72c 2675 /* Create thread quit pipe */
cf3af59e
MD
2676 if ((ret = init_thread_quit_pipe()) < 0) {
2677 goto error;
273ea72c
DG
2678 }
2679
fac6795d
DG
2680 /* Parse arguments */
2681 progname = argv[0];
2682 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 2683 goto error;
fac6795d
DG
2684 }
2685
2686 /* Daemonize */
2687 if (opt_daemon) {
53094c05
DG
2688 ret = daemon(0, 0);
2689 if (ret < 0) {
2690 perror("daemon");
cf3af59e 2691 goto error;
53094c05 2692 }
fac6795d
DG
2693 }
2694
2695 /* Check if daemon is UID = 0 */
2696 is_root = !getuid();
2697
fac6795d 2698 if (is_root) {
d6f42150
DG
2699 ret = create_lttng_rundir();
2700 if (ret < 0) {
cf3af59e 2701 goto error;
d6f42150
DG
2702 }
2703
fac6795d 2704 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
2705 snprintf(apps_unix_sock_path, PATH_MAX,
2706 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
2707 }
2708
2709 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
2710 snprintf(client_unix_sock_path, PATH_MAX,
2711 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
2712 }
fac6795d 2713 } else {
b082db07
DG
2714 home_path = get_home_dir();
2715 if (home_path == NULL) {
273ea72c
DG
2716 /* TODO: Add --socket PATH option */
2717 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
2718 ret = -EPERM;
2719 goto error;
b082db07
DG
2720 }
2721
fac6795d 2722 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 2723 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 2724 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
2725 }
2726
2727 /* Set the cli tool unix socket path */
2728 if (strlen(client_unix_sock_path) == 0) {
d6f42150 2729 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 2730 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d
DG
2731 }
2732 }
2733
847177cd
DG
2734 DBG("Client socket path %s", client_unix_sock_path);
2735 DBG("Application socket path %s", apps_unix_sock_path);
2736
273ea72c 2737 /*
7d8234d9 2738 * See if daemon already exist.
fac6795d 2739 */
7d8234d9 2740 if ((ret = check_existing_daemon()) < 0) {
75462a81 2741 ERR("Already running daemon.\n");
273ea72c 2742 /*
cf3af59e
MD
2743 * We do not goto exit because we must not cleanup()
2744 * because a daemon is already running.
ab118b20 2745 */
cf3af59e 2746 goto error;
a88df331
DG
2747 }
2748
2749 /* After this point, we can safely call cleanup() so goto error is used */
2750
2751 /*
2752 * These actions must be executed as root. We do that *after* setting up
2753 * the sockets path because we MUST make the check for another daemon using
2754 * those paths *before* trying to set the kernel consumer sockets and init
2755 * kernel tracer.
2756 */
2757 if (is_root) {
2758 ret = set_kconsumerd_sockets();
2759 if (ret < 0) {
cf3af59e 2760 goto exit;
a88df331
DG
2761 }
2762
2763 /* Setup kernel tracer */
2764 init_kernel_tracer();
2765
2766 /* Set ulimit for open files */
2767 set_ulimit();
fac6795d
DG
2768 }
2769
cf3af59e
MD
2770 if ((ret = set_signal_handler()) < 0) {
2771 goto exit;
fac6795d
DG
2772 }
2773
d6f42150 2774 /* Setup the needed unix socket */
cf3af59e
MD
2775 if ((ret = init_daemon_socket()) < 0) {
2776 goto exit;
fac6795d
DG
2777 }
2778
2779 /* Set credentials to socket */
cf3af59e
MD
2780 if (is_root && ((ret = set_permissions()) < 0)) {
2781 goto exit;
fac6795d
DG
2782 }
2783
5b8719f5
DG
2784 /* Get parent pid if -S, --sig-parent is specified. */
2785 if (opt_sig_parent) {
2786 ppid = getppid();
2787 }
2788
7a485870 2789 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD
2790 if ((ret = create_kernel_poll_pipe()) < 0) {
2791 goto exit;
7a485870
DG
2792 }
2793
273ea72c
DG
2794 /*
2795 * Get session list pointer. This pointer MUST NOT be free().
2796 * This list is statically declared in session.c
2797 */
b5541356
DG
2798 session_list_ptr = get_session_list();
2799
cf3af59e
MD
2800 /* Create thread to manage the client socket */
2801 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
2802 if (ret != 0) {
2803 perror("pthread_create");
2804 goto exit_client;
2805 }
fac6795d 2806
cf3af59e
MD
2807 /* Create thread to manage application socket */
2808 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
2809 if (ret != 0) {
2810 perror("pthread_create");
2811 goto exit_apps;
2812 }
fac6795d 2813
cf3af59e
MD
2814 /* Create kernel thread to manage kernel event */
2815 ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL);
2816 if (ret != 0) {
2817 perror("pthread_create");
2818 goto exit_kernel;
2819 }
7a485870 2820
cf3af59e
MD
2821 ret = pthread_join(kernel_thread, &status);
2822 if (ret != 0) {
2823 perror("pthread_join");
2824 goto error; /* join error, exit without cleanup */
fac6795d
DG
2825 }
2826
cf3af59e
MD
2827exit_kernel:
2828 ret = pthread_join(apps_thread, &status);
2829 if (ret != 0) {
2830 perror("pthread_join");
2831 goto error; /* join error, exit without cleanup */
2832 }
fac6795d 2833
cf3af59e
MD
2834exit_apps:
2835 ret = pthread_join(client_thread, &status);
2836 if (ret != 0) {
2837 perror("pthread_join");
2838 goto error; /* join error, exit without cleanup */
2839 }
2840
2841 ret = join_kconsumerd_thread();
2842 if (ret != 0) {
2843 perror("join_kconsumerd");
2844 goto error; /* join error, exit without cleanup */
2845 }
a88df331 2846
cf3af59e 2847exit_client:
a88df331 2848exit:
cf3af59e
MD
2849 /*
2850 * cleanup() is called when no other thread is running.
2851 */
2852 cleanup();
2853 if (!ret)
2854 exit(EXIT_SUCCESS);
2855error:
5e16da05 2856 exit(EXIT_FAILURE);
fac6795d 2857}
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