Allow channel mode override in snapshot sessions
[lttng-tools.git] / src / bin / lttng / commands / create.c
CommitLineData
f3ed775e
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
f3ed775e
DG
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
d14d33bf
AM
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
f3ed775e
DG
16 */
17
6c1c0768 18#define _LGPL_SOURCE
a4b92340 19#include <assert.h>
ecc48a90 20#include <ctype.h>
f3ed775e
DG
21#include <popt.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/stat.h>
26#include <sys/types.h>
27#include <time.h>
28#include <unistd.h>
92360082 29#include <signal.h>
bbd44cae 30#include <sys/wait.h>
f3ed775e 31
37d03ff7
JRJ
32#include <common/mi-lttng.h>
33
c399183f 34#include "../command.h"
679b4943 35#include "../utils.h"
f3ed775e 36
00e2e675 37#include <common/defaults.h>
42224349 38#include <common/sessiond-comm/sessiond-comm.h>
00e2e675 39#include <common/uri.h>
81b86775 40#include <common/utils.h>
16f6f820 41#include <lttng/snapshot.h>
42224349 42
f3ed775e
DG
43static char *opt_output_path;
44static char *opt_session_name;
a4b92340
DG
45static char *opt_url;
46static char *opt_ctrl_url;
47static char *opt_data_url;
d7ba1388 48static char *opt_shm_path;
a4b92340 49static int opt_no_consumer;
96fe6b8d 50static int opt_no_output;
16f6f820 51static int opt_snapshot;
ecc48a90 52static unsigned int opt_live_timer;
f3ed775e
DG
53
54enum {
55 OPT_HELP = 1,
679b4943 56 OPT_LIST_OPTIONS,
ecc48a90 57 OPT_LIVE_TIMER,
f3ed775e
DG
58};
59
37d03ff7
JRJ
60static struct mi_writer *writer;
61
f3ed775e
DG
62static struct poptOption long_options[] = {
63 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
679b4943
SM
64 {"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
65 {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL},
66 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
23d14dff
DG
67 {"set-url", 'U', POPT_ARG_STRING, &opt_url, 0, 0, 0},
68 {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
69 {"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
96fe6b8d 70 {"no-output", 0, POPT_ARG_VAL, &opt_no_output, 1, 0, 0},
2bba9e53 71 {"no-consumer", 0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0},
16f6f820 72 {"snapshot", 0, POPT_ARG_VAL, &opt_snapshot, 1, 0, 0},
d73c5802 73 {"live", 0, POPT_ARG_INT | POPT_ARGFLAG_OPTIONAL, 0, OPT_LIVE_TIMER, 0, 0},
d7ba1388 74 {"shm-path", 0, POPT_ARG_STRING, &opt_shm_path, 0, 0, 0},
f3ed775e
DG
75 {0, 0, 0, 0, 0, 0, 0}
76};
77
16de1a24
DG
78/*
79 * Please have a look at src/lib/lttng-ctl/lttng-ctl.c for more information on
80 * why this declaration exists and used ONLY in for this command.
81 */
07424f16 82extern int _lttng_create_session_ext(const char *name, const char *url,
d1edd8a8 83 const char *datetime);
07424f16 84
37d03ff7 85/*
485ca16f 86 * Retrieve the created session and mi output it based on provided argument
37d03ff7
JRJ
87 * This is currently a summary of what was pretty printed and is subject to
88 * enhancements.
37d03ff7
JRJ
89 */
90static int mi_created_session(const char *session_name)
91{
92 int ret, i, count, found;
93 struct lttng_session *sessions;
94
95 /* session_name should not be null */
96 assert(session_name);
97 assert(writer);
98
99 count = lttng_list_sessions(&sessions);
100 if (count < 0) {
101 ret = count;
102 ERR("%s", lttng_strerror(ret));
103 goto error;
104 }
105
106 if (count == 0) {
107 ERR("Error session creation failed: session %s not found", session_name);
108 ret = -LTTNG_ERR_SESS_NOT_FOUND;
109 goto end;
110 }
111
112 found = 0;
113 for (i = 0; i < count; i++) {
114 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
115 found = 1;
116 ret = mi_lttng_session(writer, &sessions[i], 0);
117 if (ret) {
118 goto error;
119 }
120 break;
121 }
122 }
123
124 if (!found) {
125 ret = -LTTNG_ERR_SESS_NOT_FOUND;
126 } else {
127 ret = CMD_SUCCESS;
128 }
129
130error:
131 free(sessions);
132end:
133 return ret;
134}
135
00e2e675 136/*
a4b92340 137 * For a session name, set the consumer URLs.
00e2e675 138 */
a4b92340
DG
139static int set_consumer_url(const char *session_name, const char *ctrl_url,
140 const char *data_url)
00e2e675 141{
a4b92340
DG
142 int ret;
143 struct lttng_handle *handle;
a4b92340
DG
144
145 assert(session_name);
146
147 /*
95681498
JG
148 * Set handle with the session_name, but no domain. This implies that
149 * the actions taken with this handle apply on the tracing session
150 * rather then the domain-specific session.
a4b92340 151 */
95681498 152 handle = lttng_create_handle(session_name, NULL);
a4b92340
DG
153 if (handle == NULL) {
154 ret = CMD_FATAL;
155 goto error;
156 }
00e2e675 157
a4b92340
DG
158 ret = lttng_set_consumer_url(handle, ctrl_url, data_url);
159 if (ret < 0) {
160 goto error;
00e2e675
DG
161 }
162
a4b92340
DG
163 if (ctrl_url) {
164 MSG("Control URL %s set for session %s", ctrl_url, session_name);
00e2e675
DG
165 }
166
a4b92340
DG
167 if (data_url) {
168 MSG("Data URL %s set for session %s", data_url, session_name);
169 }
170
171error:
172 lttng_destroy_handle(handle);
173 return ret;
174}
175
16f6f820
DG
176static int add_snapshot_output(const char *session_name, const char *ctrl_url,
177 const char *data_url)
178{
179 int ret;
180 struct lttng_snapshot_output *output = NULL;
181
182 assert(session_name);
183
184 output = lttng_snapshot_output_create();
185 if (!output) {
186 ret = CMD_FATAL;
187 goto error_create;
188 }
189
190 if (ctrl_url) {
191 ret = lttng_snapshot_output_set_ctrl_url(ctrl_url, output);
192 if (ret < 0) {
193 goto error;
194 }
195 }
196
197 if (data_url) {
198 ret = lttng_snapshot_output_set_data_url(data_url, output);
199 if (ret < 0) {
200 goto error;
201 }
202 }
203
204 /* This call, if successful, populates the id of the output object. */
205 ret = lttng_snapshot_add_output(session_name, output);
206 if (ret < 0) {
207 goto error;
208 }
209
210error:
211 lttng_snapshot_output_destroy(output);
212error_create:
213 return ret;
214}
215
f3ed775e 216/*
1c8d13c8
TD
217 * Create a tracing session.
218 * If no name is specified, a default name is generated.
f3ed775e 219 *
1c8d13c8 220 * Returns one of the CMD_* result constants.
f3ed775e 221 */
a4b92340 222static int create_session(void)
f3ed775e 223{
a4b92340 224 int ret;
07424f16 225 char *session_name = NULL, *traces_path = NULL, *alloc_path = NULL;
a4b92340 226 char *alloc_url = NULL, *url = NULL, datetime[16];
487b253b 227 char session_name_date[NAME_MAX + 17], *print_str_url = NULL;
f3ed775e
DG
228 time_t rawtime;
229 struct tm *timeinfo;
d7ba1388 230 char shm_path[PATH_MAX] = "";
f3ed775e 231
d6175221
DG
232 /* Get date and time for automatic session name/path */
233 time(&rawtime);
234 timeinfo = localtime(&rawtime);
235 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
236
f3ed775e
DG
237 /* Auto session name creation */
238 if (opt_session_name == NULL) {
07424f16
DG
239 ret = snprintf(session_name_date, sizeof(session_name_date),
240 DEFAULT_SESSION_NAME "-%s", datetime);
d6175221 241 if (ret < 0) {
07424f16
DG
242 PERROR("snprintf session name");
243 goto error;
244 }
04965770 245 session_name = session_name_date;
07424f16 246 DBG("Auto session name set to %s", session_name_date);
f3ed775e 247 } else {
487b253b
DG
248 if (strlen(opt_session_name) > NAME_MAX) {
249 ERR("Session name too long. Length must be lower or equal to %d",
250 NAME_MAX);
251 ret = LTTNG_ERR_SESSION_FAIL;
252 goto error;
253 }
4b861950
DG
254 /*
255 * Check if the session name begins with "auto-" or is exactly "auto".
256 * Both are reserved for the default session name. See bug #449 to
257 * understand why we need to check both here.
258 */
259 if ((strncmp(opt_session_name, DEFAULT_SESSION_NAME "-",
260 strlen(DEFAULT_SESSION_NAME) + 1) == 0) ||
261 (strncmp(opt_session_name, DEFAULT_SESSION_NAME,
61b35a5a 262 strlen(DEFAULT_SESSION_NAME)) == 0 &&
4b861950 263 strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME))) {
61b35a5a
DG
264 ERR("%s is a reserved keyword for default session(s)",
265 DEFAULT_SESSION_NAME);
266 ret = CMD_ERROR;
267 goto error;
268 }
f3ed775e 269 session_name = opt_session_name;
07424f16
DG
270 ret = snprintf(session_name_date, sizeof(session_name_date),
271 "%s-%s", session_name, datetime);
272 if (ret < 0) {
273 PERROR("snprintf session name");
274 goto error;
275 }
f3ed775e
DG
276 }
277
1a241656
DG
278 if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
279 ERR("You need both control and data URL.");
280 ret = CMD_ERROR;
281 goto error;
282 }
283
785d2d0d 284 if (opt_output_path != NULL) {
81b86775 285 traces_path = utils_expand_path(opt_output_path);
00e2e675
DG
286 if (traces_path == NULL) {
287 ret = CMD_ERROR;
288 goto error;
289 }
290
37d03ff7 291 /* Create URL string from the local file system path */
a4b92340 292 ret = asprintf(&alloc_url, "file://%s", traces_path);
00e2e675 293 if (ret < 0) {
a4b92340 294 PERROR("asprintf url path");
00e2e675
DG
295 ret = CMD_FATAL;
296 goto error;
297 }
a4b92340
DG
298 /* URL to use in the lttng_create_session() call */
299 url = alloc_url;
40b03f52 300 print_str_url = traces_path;
a4b92340
DG
301 } else if (opt_url) { /* Handling URL (-U opt) */
302 url = opt_url;
40b03f52 303 print_str_url = url;
1a241656
DG
304 } else if (opt_data_url && opt_ctrl_url) {
305 /*
306 * With both control and data, we'll be setting the consumer URL after
307 * session creation thus use no URL.
308 */
309 url = NULL;
2bba9e53 310 } else if (!opt_no_output) {
ab2e5c7c
MD
311 char *tmp_path;
312
00e2e675 313 /* Auto output path */
ab2e5c7c
MD
314 tmp_path = utils_get_home_dir();
315 if (tmp_path == NULL) {
d386b234 316 ERR("HOME path not found.\n \
00e2e675 317 Please specify an output path using -o, --output PATH");
f3ed775e
DG
318 ret = CMD_FATAL;
319 goto error;
320 }
ab2e5c7c
MD
321 alloc_path = strdup(tmp_path);
322 if (!alloc_path) {
323 PERROR("allocating alloc_path");
324 ret = CMD_FATAL;
325 goto error;
326 }
07424f16
DG
327 ret = asprintf(&alloc_url,
328 "file://%s/" DEFAULT_TRACE_DIR_NAME "/%s",
329 alloc_path, session_name_date);
58a97671 330 if (ret < 0) {
00e2e675
DG
331 PERROR("asprintf trace dir name");
332 ret = CMD_FATAL;
58a97671
DG
333 goto error;
334 }
00e2e675 335
a4b92340 336 url = alloc_url;
1a241656 337 print_str_url = alloc_url + strlen("file://");
2bba9e53 338 } else {
96fe6b8d 339 /* No output means --no-output or --snapshot mode. */
2bba9e53 340 url = NULL;
00e2e675
DG
341 }
342
1a241656 343 /* Use default live URL if NO url is/are found. */
ecc48a90 344 if ((opt_live_timer && !opt_url) && (opt_live_timer && !opt_data_url)) {
d73c5802
DG
345 ret = asprintf(&alloc_url, "net://127.0.0.1");
346 if (ret < 0) {
347 PERROR("asprintf default live URL");
348 ret = CMD_FATAL;
349 goto error;
350 }
351 url = alloc_url;
352 print_str_url = url;
ecc48a90
JD
353 }
354
355 if (opt_snapshot && opt_live_timer) {
356 ERR("Snapshot and live modes are mutually exclusive.");
357 ret = CMD_ERROR;
358 goto error;
359 }
360
16f6f820
DG
361 if (opt_snapshot) {
362 /* No output by default. */
363 const char *snapshot_url = NULL;
364
365 if (opt_url) {
366 snapshot_url = url;
367 } else if (!opt_data_url && !opt_ctrl_url) {
368 /* This is the session path that we need to use as output. */
369 snapshot_url = url;
370 }
371 ret = lttng_create_session_snapshot(session_name, snapshot_url);
ecc48a90 372 } else if (opt_live_timer) {
8960e9cd
DG
373 const char *pathname;
374
375 if (opt_relayd_path) {
376 pathname = opt_relayd_path;
377 } else {
378 pathname = INSTALL_BIN_PATH "/lttng-relayd";
379 }
2c521c63
DG
380 if (!opt_url && !opt_data_url && !check_relayd() &&
381 spawn_relayd(pathname, 0) < 0) {
8960e9cd
DG
382 goto error;
383 }
ecc48a90 384 ret = lttng_create_session_live(session_name, url, opt_live_timer);
16f6f820 385 } else {
d1edd8a8 386 ret = _lttng_create_session_ext(session_name, url, datetime);
16f6f820 387 }
f3ed775e 388 if (ret < 0) {
ae856491 389 /* Don't set ret so lttng can interpret the sessiond error. */
42224349 390 switch (-ret) {
f73fabfd 391 case LTTNG_ERR_EXIST_SESS:
42224349
DG
392 WARN("Session %s already exists", session_name);
393 break;
60e835ca 394 default:
60e835ca 395 break;
42224349 396 }
f3ed775e
DG
397 goto error;
398 }
399
0ab61906 400 if (opt_ctrl_url && opt_data_url) {
16f6f820
DG
401 if (opt_snapshot) {
402 ret = add_snapshot_output(session_name, opt_ctrl_url,
403 opt_data_url);
404 } else {
405 /* Setting up control URI (-C or/and -D opt) */
406 ret = set_consumer_url(session_name, opt_ctrl_url, opt_data_url);
407 }
a4b92340 408 if (ret < 0) {
4f50c803
DG
409 /* Destroy created session because the URL are not valid. */
410 lttng_destroy_session(session_name);
a4b92340
DG
411 goto error;
412 }
4f50c803
DG
413 }
414
d7ba1388
MD
415 if (opt_shm_path) {
416 ret = snprintf(shm_path, sizeof(shm_path),
417 "%s/%s", opt_shm_path, session_name_date);
418 if (ret < 0) {
419 PERROR("snprintf shm_path");
420 goto error;
421 }
422
423 ret = lttng_set_session_shm_path(session_name, shm_path);
424 if (ret < 0) {
425 lttng_destroy_session(session_name);
426 goto error;
427 }
428 }
429
4f50c803 430 MSG("Session %s created.", session_name);
16f6f820 431 if (print_str_url && !opt_snapshot) {
4f50c803 432 MSG("Traces will be written in %s", print_str_url);
d73c5802
DG
433
434 if (opt_live_timer) {
435 MSG("Live timer set to %u usec", opt_live_timer);
436 }
16f6f820
DG
437 } else if (opt_snapshot) {
438 if (print_str_url) {
439 MSG("Default snapshot output set to: %s", print_str_url);
440 }
441 MSG("Snapshot mode set. Every channel enabled for that session will "
8d5841ea 442 "be set to mmap output, and default to overwrite mode.");
a4b92340 443 }
d7ba1388
MD
444 if (opt_shm_path) {
445 MSG("Session %s set to shm_path: %s.", session_name,
446 shm_path);
447 }
a4b92340 448
37d03ff7
JRJ
449 /* Mi output */
450 if (lttng_opt_mi) {
451 ret = mi_created_session(session_name);
452 if (ret) {
453 ret = CMD_ERROR;
454 goto error;
455 }
456 }
457
58a97671
DG
458 /* Init lttng session config */
459 ret = config_init(session_name);
f3ed775e 460 if (ret < 0) {
27089920 461 ret = CMD_ERROR;
f3ed775e
DG
462 goto error;
463 }
464
f3ed775e
DG
465 ret = CMD_SUCCESS;
466
467error:
0e428499
DG
468 free(alloc_url);
469 free(traces_path);
87f222b6 470 free(alloc_path);
a4b92340
DG
471
472 if (ret < 0) {
473 ERR("%s", lttng_strerror(ret));
474 }
f3ed775e
DG
475 return ret;
476}
477
92360082
JG
478/*
479 * spawn_sessiond
480 *
481 * Spawn a session daemon by forking and execv.
482 */
483static int spawn_sessiond(char *pathname)
484{
485 int ret = 0;
486 pid_t pid;
487
488 MSG("Spawning a session daemon");
92360082
JG
489 pid = fork();
490 if (pid == 0) {
491 /*
bbd44cae 492 * Spawn session daemon in daemon mode.
92360082 493 */
bbd44cae
PP
494 execlp(pathname, "lttng-sessiond",
495 "--daemonize", NULL);
92360082
JG
496 /* execlp only returns if error happened */
497 if (errno == ENOENT) {
498 ERR("No session daemon found. Use --sessiond-path.");
499 } else {
500 PERROR("execlp");
501 }
502 kill(getppid(), SIGTERM); /* wake parent */
503 exit(EXIT_FAILURE);
504 } else if (pid > 0) {
92360082 505 /*
bbd44cae
PP
506 * In daemon mode (--daemonize), sessiond only exits when
507 * it's ready to accept commands.
92360082 508 */
bbd44cae 509 for (;;) {
81527d36
JG
510 int status;
511 pid_t wait_pid_ret = waitpid(pid, &status, 0);
512
513 if (wait_pid_ret < 0) {
514 if (errno == EINTR) {
515 continue;
516 }
517 PERROR("waitpid");
518 ret = -errno;
519 goto end;
520 }
bbd44cae
PP
521
522 if (WIFSIGNALED(status)) {
523 ERR("Session daemon was killed by signal %d",
524 WTERMSIG(status));
525 ret = -1;
526 goto end;
527 } else if (WIFEXITED(status)) {
528 DBG("Session daemon terminated normally (exit status: %d)",
529 WEXITSTATUS(status));
530
531 if (WEXITSTATUS(status) != 0) {
532 ERR("Session daemon terminated with an error (exit status: %d)",
533 WEXITSTATUS(status));
534 ret = -1;
535 goto end;
536 }
537 break;
538 }
92360082 539 }
bbd44cae 540
92360082
JG
541 goto end;
542 } else {
543 PERROR("fork");
544 ret = -1;
545 goto end;
546 }
547
548end:
549 return ret;
550}
551
552/*
553 * launch_sessiond
554 *
555 * Check if the session daemon is available using
556 * the liblttngctl API for the check. If not, try to
557 * spawn a daemon.
558 */
559static int launch_sessiond(void)
560{
561 int ret;
562 char *pathname = NULL;
563
564 ret = lttng_session_daemon_alive();
565 if (ret) {
566 /* Sessiond is alive, not an error */
567 ret = 0;
568 goto end;
569 }
570
571 /* Try command line option path */
572 pathname = opt_sessiond_path;
573
574 /* Try LTTNG_SESSIOND_PATH env variable */
575 if (pathname == NULL) {
576 pathname = getenv(DEFAULT_SESSIOND_PATH_ENV);
577 }
578
579 /* Try with configured path */
580 if (pathname == NULL) {
581 if (CONFIG_SESSIOND_BIN[0] != '\0') {
582 pathname = CONFIG_SESSIOND_BIN;
583 }
584 }
585
586 /* Try the default path */
587 if (pathname == NULL) {
588 pathname = INSTALL_BIN_PATH "/lttng-sessiond";
589 }
590
591 DBG("Session daemon binary path: %s", pathname);
592
593 /* Check existence and permissions */
594 ret = access(pathname, F_OK | X_OK);
595 if (ret < 0) {
596 ERR("No such file or access denied: %s", pathname);
597 goto end;
598 }
599
600 ret = spawn_sessiond(pathname);
92360082 601end:
0f4fa0d2
JG
602 if (ret) {
603 ERR("Problem occurred while launching session daemon (%s)",
604 pathname);
605 }
92360082
JG
606 return ret;
607}
608
f3ed775e 609/*
74cc1d0f 610 * The 'create <options>' first level command
1c8d13c8
TD
611 *
612 * Returns one of the CMD_* result constants.
f3ed775e
DG
613 */
614int cmd_create(int argc, const char **argv)
615{
37d03ff7 616 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
ecc48a90 617 char *opt_arg = NULL;
f3ed775e
DG
618 static poptContext pc;
619
620 pc = poptGetContext(NULL, argc, argv, long_options, 0);
621 poptReadDefaultConfig(pc, 0);
622
623 while ((opt = poptGetNextOpt(pc)) != -1) {
624 switch (opt) {
625 case OPT_HELP:
4ba92f18 626 SHOW_HELP();
f3ed775e 627 goto end;
679b4943
SM
628 case OPT_LIST_OPTIONS:
629 list_cmd_options(stdout, long_options);
679b4943 630 goto end;
ecc48a90
JD
631 case OPT_LIVE_TIMER:
632 {
633 unsigned long v;
634
635 errno = 0;
636 opt_arg = poptGetOptArg(pc);
d73c5802
DG
637 if (!opt_arg) {
638 /* Set up default values. */
639 opt_live_timer = (uint32_t) DEFAULT_LTTNG_LIVE_TIMER;
640 DBG("Session live timer interval set to default value %d",
641 opt_live_timer);
642 break;
643 }
644
ecc48a90
JD
645 v = strtoul(opt_arg, NULL, 0);
646 if (errno != 0 || !isdigit(opt_arg[0])) {
647 ERR("Wrong value in --live parameter: %s", opt_arg);
648 ret = CMD_ERROR;
649 goto end;
650 }
651 if (v != (uint32_t) v) {
652 ERR("32-bit overflow in --live parameter: %s", opt_arg);
653 ret = CMD_ERROR;
654 goto end;
655 }
0ed9e0be
JG
656 if (v == 0) {
657 ERR("Live timer interval must be greater than zero");
658 ret = CMD_ERROR;
659 goto end;
660 }
ecc48a90
JD
661 opt_live_timer = (uint32_t) v;
662 DBG("Session live timer interval set to %d", opt_live_timer);
663 break;
664 }
f3ed775e 665 default:
f3ed775e
DG
666 ret = CMD_UNDEFINED;
667 goto end;
668 }
669 }
670
785d2d0d 671 if (opt_no_consumer) {
96fe6b8d 672 MSG("The option --no-consumer is obsolete. Use --no-output now.");
785d2d0d
DG
673 ret = CMD_WARNING;
674 goto end;
675 }
676
92360082
JG
677 /* Spawn a session daemon if needed */
678 if (!opt_no_sessiond) {
679 ret = launch_sessiond();
680 if (ret) {
681 ret = CMD_ERROR;
682 goto end;
683 }
684 }
685
acc09215 686 /* MI initialization */
37d03ff7
JRJ
687 if (lttng_opt_mi) {
688 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
689 if (!writer) {
690 ret = -LTTNG_ERR_NOMEM;
691 goto end;
692 }
693
694 /* Open command element */
695 ret = mi_lttng_writer_command_open(writer,
696 mi_lttng_element_command_create);
697 if (ret) {
698 ret = CMD_ERROR;
699 goto end;
700 }
701
702 /* Open output element */
703 ret = mi_lttng_writer_open_element(writer,
704 mi_lttng_element_command_output);
705 if (ret) {
706 ret = CMD_ERROR;
707 goto end;
708 }
709 }
f3ed775e
DG
710 opt_session_name = (char*) poptGetArg(pc);
711
37d03ff7
JRJ
712 command_ret = create_session();
713 if (command_ret) {
714 success = 0;
715 }
716
717 if (lttng_opt_mi) {
718 /* Close output element */
719 ret = mi_lttng_writer_close_element(writer);
720 if (ret) {
721 ret = CMD_ERROR;
722 goto end;
723 }
724
725 /* Success ? */
726 ret = mi_lttng_writer_write_element_bool(writer,
727 mi_lttng_element_command_success, success);
728 if (ret) {
729 ret = CMD_ERROR;
730 goto end;
731 }
732
733 /* Command element close */
734 ret = mi_lttng_writer_command_close(writer);
735 if (ret) {
736 ret = CMD_ERROR;
737 goto end;
738 }
739 }
f3ed775e
DG
740
741end:
37d03ff7
JRJ
742 /* Mi clean-up */
743 if (writer && mi_lttng_writer_destroy(writer)) {
744 /* Preserve original error code */
745 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
746 }
747
acc09215 748 /* Overwrite ret if an error occurred in create_session() */
37d03ff7
JRJ
749 ret = command_ret ? command_ret : ret;
750
ca1c3607 751 poptFreeContext(pc);
f3ed775e
DG
752 return ret;
753}
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