fa65b1eaa9257d84e3be698a7e10a9960683c0d8
[lttng-tools.git] / src / bin / lttng / commands / enable_channels.c
1 /*
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #define _LGPL_SOURCE
9 #include <popt.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <sys/stat.h>
14 #include <sys/types.h>
15 #include <unistd.h>
16 #include <inttypes.h>
17 #include <assert.h>
18 #include <ctype.h>
19
20 #include <common/sessiond-comm/sessiond-comm.h>
21 #include <common/utils.h>
22 #include <common/mi-lttng.h>
23
24 #include "../command.h"
25 #include "../utils.h"
26
27
28 static struct lttng_channel chan_opts;
29 static char *opt_channels;
30 static int opt_kernel;
31 static char *opt_session_name;
32 static int opt_userspace;
33 static char *opt_output;
34 static int opt_buffer_uid;
35 static int opt_buffer_pid;
36 static int opt_buffer_global;
37 static struct {
38 bool set;
39 uint64_t interval;
40 } opt_monitor_timer;
41 static struct {
42 bool set;
43 int64_t value;
44 } opt_blocking_timeout;
45
46 static struct mi_writer *writer;
47
48 #ifdef LTTNG_EMBED_HELP
49 static const char help_msg[] =
50 #include <lttng-enable-channel.1.h>
51 ;
52 #endif
53
54 enum {
55 OPT_HELP = 1,
56 OPT_DISCARD,
57 OPT_OVERWRITE,
58 OPT_SUBBUF_SIZE,
59 OPT_NUM_SUBBUF,
60 OPT_SWITCH_TIMER,
61 OPT_MONITOR_TIMER,
62 OPT_READ_TIMER,
63 OPT_USERSPACE,
64 OPT_LIST_OPTIONS,
65 OPT_TRACEFILE_SIZE,
66 OPT_TRACEFILE_COUNT,
67 OPT_BLOCKING_TIMEOUT,
68 };
69
70 static struct lttng_handle *handle;
71
72 const char *output_mmap = "mmap";
73 const char *output_splice = "splice";
74
75 static struct poptOption long_options[] = {
76 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
77 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
78 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
79 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
80 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
81 {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
82 {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
83 {"subbuf-size", 0, POPT_ARG_STRING, 0, OPT_SUBBUF_SIZE, 0, 0},
84 {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
85 {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
86 {"monitor-timer", 0, POPT_ARG_INT, 0, OPT_MONITOR_TIMER, 0, 0},
87 {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
88 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
89 {"output", 0, POPT_ARG_STRING, &opt_output, 0, 0, 0},
90 {"buffers-uid", 0, POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0},
91 {"buffers-pid", 0, POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0},
92 {"buffers-global", 0, POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
93 {"tracefile-size", 'C', POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
94 {"tracefile-count", 'W', POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
95 {"blocking-timeout", 0, POPT_ARG_INT, 0, OPT_BLOCKING_TIMEOUT, 0, 0},
96 {0, 0, 0, 0, 0, 0, 0}
97 };
98
99 /*
100 * Set default attributes depending on those already defined from the command
101 * line.
102 */
103 static void set_default_attr(struct lttng_domain *dom)
104 {
105 struct lttng_channel_attr default_attr;
106
107 memset(&default_attr, 0, sizeof(default_attr));
108
109 /* Set attributes */
110 lttng_channel_set_default_attr(dom, &default_attr);
111
112 if (chan_opts.attr.overwrite == -1) {
113 chan_opts.attr.overwrite = default_attr.overwrite;
114 }
115 if (chan_opts.attr.subbuf_size == -1) {
116 chan_opts.attr.subbuf_size = default_attr.subbuf_size;
117 }
118 if (chan_opts.attr.num_subbuf == -1) {
119 chan_opts.attr.num_subbuf = default_attr.num_subbuf;
120 }
121 if (chan_opts.attr.switch_timer_interval == -1) {
122 chan_opts.attr.switch_timer_interval = default_attr.switch_timer_interval;
123 }
124 if (chan_opts.attr.read_timer_interval == -1) {
125 chan_opts.attr.read_timer_interval = default_attr.read_timer_interval;
126 }
127 if ((int) chan_opts.attr.output == -1) {
128 chan_opts.attr.output = default_attr.output;
129 }
130 if (chan_opts.attr.tracefile_count == -1) {
131 chan_opts.attr.tracefile_count = default_attr.tracefile_count;
132 }
133 if (chan_opts.attr.tracefile_size == -1) {
134 chan_opts.attr.tracefile_size = default_attr.tracefile_size;
135 }
136 }
137
138 /*
139 * Adding channel using the lttng API.
140 */
141 static int enable_channel(char *session_name)
142 {
143 struct lttng_channel *channel = NULL;
144 int ret = CMD_SUCCESS, warn = 0, error = 0, success = 0;
145 char *channel_name;
146 struct lttng_domain dom;
147
148 memset(&dom, 0, sizeof(dom));
149
150 /* Validate options. */
151 if (opt_kernel) {
152 if (opt_blocking_timeout.set) {
153 ERR("Retry timeout option not supported for kernel domain (-k)");
154 ret = CMD_ERROR;
155 goto error;
156 }
157 }
158
159 /* Create lttng domain */
160 if (opt_kernel) {
161 dom.type = LTTNG_DOMAIN_KERNEL;
162 dom.buf_type = LTTNG_BUFFER_GLOBAL;
163 if (opt_buffer_uid || opt_buffer_pid) {
164 ERR("Buffer type not supported for domain -k");
165 ret = CMD_ERROR;
166 goto error;
167 }
168 } else if (opt_userspace) {
169 dom.type = LTTNG_DOMAIN_UST;
170 if (opt_buffer_pid) {
171 dom.buf_type = LTTNG_BUFFER_PER_PID;
172 } else {
173 if (opt_buffer_global) {
174 ERR("Buffer type not supported for domain -u");
175 ret = CMD_ERROR;
176 goto error;
177 }
178 dom.buf_type = LTTNG_BUFFER_PER_UID;
179 }
180 } else {
181 /* Checked by the caller. */
182 assert(0);
183 }
184
185 set_default_attr(&dom);
186
187 if (chan_opts.attr.tracefile_size == 0 && chan_opts.attr.tracefile_count) {
188 ERR("Missing option --tracefile-size. "
189 "A file count without a size won't do anything.");
190 ret = CMD_ERROR;
191 goto error;
192 }
193
194 if ((chan_opts.attr.tracefile_size > 0) &&
195 (chan_opts.attr.tracefile_size < chan_opts.attr.subbuf_size)) {
196 WARN("Tracefile size rounded up from (%" PRIu64 ") to subbuffer size (%" PRIu64 ")",
197 chan_opts.attr.tracefile_size, chan_opts.attr.subbuf_size);
198 chan_opts.attr.tracefile_size = chan_opts.attr.subbuf_size;
199 }
200
201 /* Setting channel output */
202 if (opt_output) {
203 if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) {
204 chan_opts.attr.output = LTTNG_EVENT_MMAP;
205 } else if (!strncmp(output_splice, opt_output, strlen(output_splice))) {
206 chan_opts.attr.output = LTTNG_EVENT_SPLICE;
207 } else {
208 ERR("Unknown output type %s. Possible values are: %s, %s\n",
209 opt_output, output_mmap, output_splice);
210 ret = CMD_ERROR;
211 goto error;
212 }
213 }
214
215 handle = lttng_create_handle(session_name, &dom);
216 if (handle == NULL) {
217 ret = -1;
218 goto error;
219 }
220
221 /* Mi open channels element */
222 if (lttng_opt_mi) {
223 assert(writer);
224 ret = mi_lttng_channels_open(writer);
225 if (ret) {
226 ret = CMD_ERROR;
227 goto error;
228 }
229 }
230
231 /* Strip channel list (format: chan1,chan2,...) */
232 channel_name = strtok(opt_channels, ",");
233 while (channel_name != NULL) {
234 void *extended_ptr;
235
236 /* Validate channel name's length */
237 if (strlen(channel_name) >= sizeof(chan_opts.name)) {
238 ERR("Channel name is too long (max. %zu characters)",
239 sizeof(chan_opts.name) - 1);
240 error = 1;
241 goto skip_enable;
242 }
243
244 /*
245 * A dynamically-allocated channel is used in order to allow
246 * the configuration of extended attributes (post-2.9).
247 */
248 channel = lttng_channel_create(&dom);
249 if (!channel) {
250 ERR("Unable to create channel object");
251 error = 1;
252 goto error;
253 }
254
255 /* Copy channel name */
256 strcpy(channel->name, channel_name);
257 channel->enabled = 1;
258 extended_ptr = channel->attr.extended.ptr;
259 memcpy(&channel->attr, &chan_opts.attr, sizeof(chan_opts.attr));
260 channel->attr.extended.ptr = extended_ptr;
261 if (opt_monitor_timer.set) {
262 ret = lttng_channel_set_monitor_timer_interval(channel,
263 opt_monitor_timer.interval);
264 if (ret) {
265 ERR("Failed to set the channel's monitor timer interval");
266 error = 1;
267 goto error;
268 }
269 }
270 if (opt_blocking_timeout.set) {
271 ret = lttng_channel_set_blocking_timeout(channel,
272 opt_blocking_timeout.value);
273 if (ret) {
274 ERR("Failed to set the channel's blocking timeout");
275 error = 1;
276 goto error;
277 }
278 }
279
280 DBG("Enabling channel %s", channel_name);
281
282 ret = lttng_enable_channel(handle, channel);
283 if (ret < 0) {
284 success = 0;
285 switch (-ret) {
286 case LTTNG_ERR_KERN_CHAN_EXIST:
287 case LTTNG_ERR_UST_CHAN_EXIST:
288 case LTTNG_ERR_CHAN_EXIST:
289 WARN("Channel %s: %s (session %s)", channel_name,
290 lttng_strerror(ret), session_name);
291 warn = 1;
292 break;
293 case LTTNG_ERR_INVALID_CHANNEL_NAME:
294 ERR("Invalid channel name: \"%s\". "
295 "Channel names may not start with '.', and "
296 "may not contain '/'.", channel_name);
297 error = 1;
298 break;
299 default:
300 ERR("Channel %s: %s (session %s)", channel_name,
301 lttng_strerror(ret), session_name);
302 error = 1;
303 break;
304 }
305 } else {
306 MSG("%s channel %s enabled for session %s",
307 get_domain_str(dom.type), channel_name, session_name);
308 success = 1;
309 }
310
311 skip_enable:
312 if (lttng_opt_mi) {
313 /* Mi print the channel element and leave it open */
314 ret = mi_lttng_channel(writer, channel, 1);
315 if (ret) {
316 ret = CMD_ERROR;
317 goto error;
318 }
319
320 /* Individual Success ? */
321 ret = mi_lttng_writer_write_element_bool(writer,
322 mi_lttng_element_command_success, success);
323 if (ret) {
324 ret = CMD_ERROR;
325 goto error;
326 }
327
328 /* Close channel element */
329 ret = mi_lttng_writer_close_element(writer);
330 if (ret) {
331 ret = CMD_ERROR;
332 goto error;
333 }
334 }
335
336 /* Next channel */
337 channel_name = strtok(NULL, ",");
338 lttng_channel_destroy(channel);
339 channel = NULL;
340 }
341
342 if (lttng_opt_mi) {
343 /* Close channels element */
344 ret = mi_lttng_writer_close_element(writer);
345 if (ret) {
346 ret = CMD_ERROR;
347 goto error;
348 }
349 }
350
351 ret = CMD_SUCCESS;
352
353 error:
354 if (channel) {
355 lttng_channel_destroy(channel);
356 }
357 /* If more important error happen bypass the warning */
358 if (!ret && warn) {
359 ret = CMD_WARNING;
360 }
361 /* If more important error happen bypass the warning */
362 if (!ret && error) {
363 ret = CMD_ERROR;
364 }
365
366 lttng_destroy_handle(handle);
367
368 return ret;
369 }
370
371 /*
372 * Default value for channel configuration.
373 */
374 static void init_channel_config(void)
375 {
376 /*
377 * Put -1 everywhere so we can identify those set by the command line and
378 * those needed to be set by the default values.
379 */
380 memset(&chan_opts.attr, -1, sizeof(chan_opts.attr));
381 chan_opts.attr.extended.ptr = NULL;
382 }
383
384 /*
385 * Add channel to trace session
386 */
387 int cmd_enable_channels(int argc, const char **argv)
388 {
389 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
390 static poptContext pc;
391 char *session_name = NULL;
392 char *opt_arg = NULL;
393 const char *leftover = NULL;
394
395 init_channel_config();
396
397 pc = poptGetContext(NULL, argc, argv, long_options, 0);
398 poptReadDefaultConfig(pc, 0);
399
400 while ((opt = poptGetNextOpt(pc)) != -1) {
401 switch (opt) {
402 case OPT_HELP:
403 SHOW_HELP();
404 goto end;
405 case OPT_DISCARD:
406 chan_opts.attr.overwrite = 0;
407 DBG("Channel set to discard");
408 break;
409 case OPT_OVERWRITE:
410 chan_opts.attr.overwrite = 1;
411 DBG("Channel set to overwrite");
412 break;
413 case OPT_SUBBUF_SIZE:
414 {
415 uint64_t rounded_size;
416 int order;
417
418 /* Parse the size */
419 opt_arg = poptGetOptArg(pc);
420 if (utils_parse_size_suffix(opt_arg, &chan_opts.attr.subbuf_size) < 0 || !chan_opts.attr.subbuf_size) {
421 ERR("Wrong value in --subbuf-size parameter: %s", opt_arg);
422 ret = CMD_ERROR;
423 goto end;
424 }
425
426 order = get_count_order_u64(chan_opts.attr.subbuf_size);
427 assert(order >= 0);
428 rounded_size = 1ULL << order;
429 if (rounded_size < chan_opts.attr.subbuf_size) {
430 ERR("The subbuf size (%" PRIu64 ") is rounded and overflows!",
431 chan_opts.attr.subbuf_size);
432 ret = CMD_ERROR;
433 goto end;
434 }
435
436 if (rounded_size != chan_opts.attr.subbuf_size) {
437 WARN("The subbuf size (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
438 chan_opts.attr.subbuf_size, rounded_size);
439 chan_opts.attr.subbuf_size = rounded_size;
440 }
441
442 /* Should now be power of 2 */
443 assert(!((chan_opts.attr.subbuf_size - 1) & chan_opts.attr.subbuf_size));
444
445 DBG("Channel subbuf size set to %" PRIu64, chan_opts.attr.subbuf_size);
446 break;
447 }
448 case OPT_NUM_SUBBUF:
449 {
450 uint64_t rounded_size;
451 int order;
452
453 errno = 0;
454 opt_arg = poptGetOptArg(pc);
455 chan_opts.attr.num_subbuf = strtoull(opt_arg, NULL, 0);
456 if (errno != 0 || !chan_opts.attr.num_subbuf || !isdigit(opt_arg[0])) {
457 ERR("Wrong value in --num-subbuf parameter: %s", opt_arg);
458 ret = CMD_ERROR;
459 goto end;
460 }
461
462 order = get_count_order_u64(chan_opts.attr.num_subbuf);
463 assert(order >= 0);
464 rounded_size = 1ULL << order;
465 if (rounded_size < chan_opts.attr.num_subbuf) {
466 ERR("The number of subbuffers (%" PRIu64 ") is rounded and overflows!",
467 chan_opts.attr.num_subbuf);
468 ret = CMD_ERROR;
469 goto end;
470 }
471
472 if (rounded_size != chan_opts.attr.num_subbuf) {
473 WARN("The number of subbuffers (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
474 chan_opts.attr.num_subbuf, rounded_size);
475 chan_opts.attr.num_subbuf = rounded_size;
476 }
477
478 /* Should now be power of 2 */
479 assert(!((chan_opts.attr.num_subbuf - 1) & chan_opts.attr.num_subbuf));
480
481 DBG("Channel subbuf num set to %" PRIu64, chan_opts.attr.num_subbuf);
482 break;
483 }
484 case OPT_SWITCH_TIMER:
485 {
486 uint64_t v;
487
488 errno = 0;
489 opt_arg = poptGetOptArg(pc);
490
491 if (utils_parse_time_suffix(opt_arg, &v) < 0) {
492 ERR("Wrong value for --switch-timer parameter: %s", opt_arg);
493 ret = CMD_ERROR;
494 goto end;
495 }
496
497 if (v != (uint32_t) v) {
498 ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg);
499 ret = CMD_ERROR;
500 goto end;
501 }
502 chan_opts.attr.switch_timer_interval = (uint32_t) v;
503 DBG("Channel switch timer interval set to %d %s",
504 chan_opts.attr.switch_timer_interval,
505 USEC_UNIT);
506 break;
507 }
508 case OPT_READ_TIMER:
509 {
510 uint64_t v;
511
512 errno = 0;
513 opt_arg = poptGetOptArg(pc);
514
515 if (utils_parse_time_suffix(opt_arg, &v) < 0) {
516 ERR("Wrong value for --read-timer parameter: %s", opt_arg);
517 ret = CMD_ERROR;
518 goto end;
519 }
520
521 if (v != (uint32_t) v) {
522 ERR("32-bit overflow in --read-timer parameter: %s", opt_arg);
523 ret = CMD_ERROR;
524 goto end;
525 }
526 chan_opts.attr.read_timer_interval = (uint32_t) v;
527 DBG("Channel read timer interval set to %d %s",
528 chan_opts.attr.read_timer_interval,
529 USEC_UNIT);
530 break;
531 }
532 case OPT_MONITOR_TIMER:
533 {
534 uint64_t v;
535
536 errno = 0;
537 opt_arg = poptGetOptArg(pc);
538
539 if (utils_parse_time_suffix(opt_arg, &v) < 0) {
540 ERR("Wrong value for --monitor-timer parameter: %s", opt_arg);
541 ret = CMD_ERROR;
542 goto end;
543 }
544 opt_monitor_timer.interval = (uint64_t) v;
545 opt_monitor_timer.set = true;
546 DBG("Channel monitor timer interval set to %" PRIu64 " %s",
547 opt_monitor_timer.interval,
548 USEC_UNIT);
549 break;
550 }
551 case OPT_BLOCKING_TIMEOUT:
552 {
553 uint64_t v;
554 long long v_msec;
555
556 errno = 0;
557 opt_arg = poptGetOptArg(pc);
558
559 if (strcmp(opt_arg, "inf") == 0) {
560 opt_blocking_timeout.value = (int64_t) -1;
561 opt_blocking_timeout.set = true;
562 DBG("Channel blocking timeout set to infinity");
563 break;
564 }
565
566 if (utils_parse_time_suffix(opt_arg, &v) < 0) {
567 ERR("Wrong value for --blocking-timeout parameter: %s", opt_arg);
568 ret = CMD_ERROR;
569 goto end;
570 }
571
572 /*
573 * While LTTng-UST and LTTng-tools will accept a
574 * blocking timeout expressed in ┬Ás, the current
575 * tracer implementation relies on poll() which
576 * takes an "int timeout" parameter expressed in
577 * msec.
578 *
579 * Since the error reporting from the tracer is
580 * not precise, we perform this check here to
581 * provide a helpful error message in case of
582 * overflow.
583 *
584 * The setter (liblttng-ctl) also performs an
585 * equivalent check.
586 */
587 v_msec = v / 1000;
588 if (v_msec != (int32_t) v_msec) {
589 ERR("32-bit milliseconds overflow in --blocking-timeout parameter: %s", opt_arg);
590 ret = CMD_ERROR;
591 goto end;
592 }
593
594 opt_blocking_timeout.value = (int64_t) v;
595 opt_blocking_timeout.set = true;
596 DBG("Channel blocking timeout set to %" PRId64 " %s%s",
597 opt_blocking_timeout.value,
598 USEC_UNIT,
599 opt_blocking_timeout.value == 0 ?
600 " (non-blocking)" : "");
601 break;
602 }
603 case OPT_USERSPACE:
604 opt_userspace = 1;
605 break;
606 case OPT_TRACEFILE_SIZE:
607 opt_arg = poptGetOptArg(pc);
608 if (utils_parse_size_suffix(opt_arg, &chan_opts.attr.tracefile_size) < 0) {
609 ERR("Wrong value in --tracefile-size parameter: %s", opt_arg);
610 ret = CMD_ERROR;
611 goto end;
612 }
613 DBG("Maximum tracefile size set to %" PRIu64,
614 chan_opts.attr.tracefile_size);
615 break;
616 case OPT_TRACEFILE_COUNT:
617 {
618 unsigned long v;
619
620 errno = 0;
621 opt_arg = poptGetOptArg(pc);
622 v = strtoul(opt_arg, NULL, 0);
623 if (errno != 0 || !isdigit(opt_arg[0])) {
624 ERR("Wrong value in --tracefile-count parameter: %s", opt_arg);
625 ret = CMD_ERROR;
626 goto end;
627 }
628 if (v != (uint32_t) v) {
629 ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg);
630 ret = CMD_ERROR;
631 goto end;
632 }
633 chan_opts.attr.tracefile_count = (uint32_t) v;
634 DBG("Maximum tracefile count set to %" PRIu64,
635 chan_opts.attr.tracefile_count);
636 break;
637 }
638 case OPT_LIST_OPTIONS:
639 list_cmd_options(stdout, long_options);
640 goto end;
641 default:
642 ret = CMD_UNDEFINED;
643 goto end;
644 }
645 }
646
647 ret = print_missing_or_multiple_domains(
648 opt_kernel + opt_userspace, false);
649 if (ret) {
650 ret = CMD_ERROR;
651 goto end;
652 }
653
654 if (chan_opts.attr.overwrite == 1 && opt_blocking_timeout.set &&
655 opt_blocking_timeout.value != 0) {
656 ERR("You cannot specify --overwrite and --blocking-timeout=N, "
657 "where N is different than 0");
658 ret = CMD_ERROR;
659 goto end;
660 }
661
662 /* Mi check */
663 if (lttng_opt_mi) {
664 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
665 if (!writer) {
666 ret = -LTTNG_ERR_NOMEM;
667 goto end;
668 }
669
670 /* Open command element */
671 ret = mi_lttng_writer_command_open(writer,
672 mi_lttng_element_command_enable_channels);
673 if (ret) {
674 ret = CMD_ERROR;
675 goto end;
676 }
677
678 /* Open output element */
679 ret = mi_lttng_writer_open_element(writer,
680 mi_lttng_element_command_output);
681 if (ret) {
682 ret = CMD_ERROR;
683 goto end;
684 }
685 }
686
687 opt_channels = (char*) poptGetArg(pc);
688 if (opt_channels == NULL) {
689 ERR("Missing channel name.\n");
690 ret = CMD_ERROR;
691 success = 0;
692 goto mi_closing;
693 }
694
695 leftover = poptGetArg(pc);
696 if (leftover) {
697 ERR("Unknown argument: %s", leftover);
698 ret = CMD_ERROR;
699 success = 0;
700 goto mi_closing;
701 }
702
703 if (!opt_session_name) {
704 session_name = get_session_name();
705 if (session_name == NULL) {
706 command_ret = CMD_ERROR;
707 success = 0;
708 goto mi_closing;
709 }
710 } else {
711 session_name = opt_session_name;
712 }
713
714 command_ret = enable_channel(session_name);
715 if (command_ret) {
716 success = 0;
717 }
718
719 mi_closing:
720 /* Mi closing */
721 if (lttng_opt_mi) {
722 /* Close output element */
723 ret = mi_lttng_writer_close_element(writer);
724 if (ret) {
725 goto end;
726 }
727
728 /* Success ? */
729 ret = mi_lttng_writer_write_element_bool(writer,
730 mi_lttng_element_command_success, success);
731 if (ret) {
732 goto end;
733 }
734
735 /* Command element close */
736 ret = mi_lttng_writer_command_close(writer);
737 if (ret) {
738 goto end;
739 }
740 }
741
742 end:
743 /* Mi clean-up */
744 if (writer && mi_lttng_writer_destroy(writer)) {
745 /* Preserve original error code */
746 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
747 }
748
749 if (!opt_session_name && session_name) {
750 free(session_name);
751 }
752
753 /* Overwrite ret if an error occurred when enable_channel */
754 ret = command_ret ? command_ret : ret;
755 poptFreeContext(pc);
756 return ret;
757 }
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