Commit | Line | Data |
---|---|---|
57f272ed DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
57f272ed DG |
19 | #include <assert.h> |
20 | #include <inttypes.h> | |
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 <unistd.h> | |
50534d6f | 28 | #include <assert.h> |
57f272ed | 29 | |
a8f307d8 | 30 | #include <common/utils.h> |
50534d6f | 31 | #include <common/mi-lttng.h> |
57f272ed DG |
32 | #include <lttng/snapshot.h> |
33 | ||
34 | #include "../command.h" | |
35 | ||
36 | static const char *opt_session_name; | |
37 | static const char *opt_output_name; | |
38 | static const char *opt_data_url; | |
39 | static const char *opt_ctrl_url; | |
40 | static const char *current_session_name; | |
41 | static uint64_t opt_max_size; | |
42 | ||
43 | /* Stub for the cmd struct actions. */ | |
44 | static int cmd_add_output(int argc, const char **argv); | |
45 | static int cmd_del_output(int argc, const char **argv); | |
46 | static int cmd_list_output(int argc, const char **argv); | |
47 | static int cmd_record(int argc, const char **argv); | |
48 | ||
49 | static const char *indent4 = " "; | |
50 | ||
51 | enum { | |
52 | OPT_HELP = 1, | |
53 | OPT_LIST_OPTIONS, | |
54 | OPT_MAX_SIZE, | |
3c9bd23c | 55 | OPT_LIST_COMMANDS, |
57f272ed DG |
56 | }; |
57 | ||
50534d6f JRJ |
58 | static struct mi_writer *writer; |
59 | ||
57f272ed DG |
60 | static struct poptOption snapshot_opts[] = { |
61 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
62 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
63 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, | |
64 | {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, | |
65 | {"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0}, | |
66 | {"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0}, | |
a8f307d8 | 67 | {"max-size", 'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0}, |
57f272ed | 68 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
3c9bd23c | 69 | {"list-commands", 0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS}, |
57f272ed DG |
70 | {0, 0, 0, 0, 0, 0, 0} |
71 | }; | |
72 | ||
73 | static struct cmd_struct actions[] = { | |
74 | { "add-output", cmd_add_output }, | |
75 | { "del-output", cmd_del_output }, | |
76 | { "list-output", cmd_list_output }, | |
77 | { "record", cmd_record }, | |
78 | { NULL, NULL } /* Array closure */ | |
79 | }; | |
80 | ||
57f272ed DG |
81 | /* |
82 | * Count and return the number of arguments in argv. | |
83 | */ | |
84 | static int count_arguments(const char **argv) | |
85 | { | |
86 | int i = 0; | |
87 | ||
88 | assert(argv); | |
89 | ||
90 | while (argv[i] != NULL) { | |
91 | i++; | |
92 | } | |
93 | ||
94 | return i; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Create a snapshot output object from arguments using the given URL. | |
99 | * | |
100 | * Return a newly allocated object or NULL on error. | |
101 | */ | |
102 | static struct lttng_snapshot_output *create_output_from_args(const char *url) | |
103 | { | |
104 | int ret = 0; | |
105 | struct lttng_snapshot_output *output = NULL; | |
106 | ||
107 | output = lttng_snapshot_output_create(); | |
108 | if (!output) { | |
109 | goto error_create; | |
110 | } | |
111 | ||
112 | if (url) { | |
113 | ret = lttng_snapshot_output_set_ctrl_url(url, output); | |
114 | if (ret < 0) { | |
115 | goto error; | |
116 | } | |
117 | } else if (opt_ctrl_url) { | |
118 | ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output); | |
119 | if (ret < 0) { | |
120 | goto error; | |
121 | } | |
122 | } | |
123 | ||
124 | if (opt_data_url) { | |
125 | ret = lttng_snapshot_output_set_data_url(opt_data_url, output); | |
126 | if (ret < 0) { | |
127 | goto error; | |
128 | } | |
129 | } | |
130 | ||
131 | if (opt_max_size) { | |
132 | ret = lttng_snapshot_output_set_size(opt_max_size, output); | |
133 | if (ret < 0) { | |
134 | goto error; | |
135 | } | |
136 | } | |
137 | ||
138 | if (opt_output_name) { | |
139 | ret = lttng_snapshot_output_set_name(opt_output_name, output); | |
140 | if (ret < 0) { | |
141 | goto error; | |
142 | } | |
143 | } | |
144 | ||
145 | return output; | |
146 | ||
147 | error: | |
148 | lttng_snapshot_output_destroy(output); | |
149 | error_create: | |
150 | return NULL; | |
151 | } | |
152 | ||
50534d6f JRJ |
153 | static int mi_list_output(void) |
154 | { | |
155 | int ret; | |
156 | struct lttng_snapshot_output *s_iter; | |
157 | struct lttng_snapshot_output_list *list; | |
158 | ||
159 | assert(writer); | |
160 | ||
161 | ret = lttng_snapshot_list_output(current_session_name, &list); | |
162 | if (ret < 0) { | |
163 | goto error; | |
164 | } | |
165 | ||
166 | ret = mi_lttng_snapshot_output_session_name(writer, current_session_name); | |
167 | if (ret) { | |
168 | ret = CMD_ERROR; | |
169 | goto end; | |
170 | } | |
171 | ||
172 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { | |
173 | ret = mi_lttng_snapshot_list_output(writer, s_iter); | |
174 | if (ret) { | |
175 | ret = CMD_ERROR; | |
176 | goto end; | |
177 | } | |
178 | } | |
179 | ||
180 | ||
181 | /* Close snapshot snapshots element */ | |
182 | ret = mi_lttng_writer_close_element(writer); | |
183 | if (ret) { | |
184 | ret = CMD_ERROR; | |
185 | goto end; | |
186 | } | |
187 | ||
188 | /* Close snapshot session element */ | |
189 | ret = mi_lttng_writer_close_element(writer); | |
190 | if (ret) { | |
191 | ret = CMD_ERROR; | |
192 | } | |
193 | end: | |
194 | lttng_snapshot_output_list_destroy(list); | |
195 | error: | |
196 | return ret; | |
197 | } | |
198 | ||
57f272ed DG |
199 | static int list_output(void) |
200 | { | |
201 | int ret, output_seen = 0; | |
202 | struct lttng_snapshot_output *s_iter; | |
203 | struct lttng_snapshot_output_list *list; | |
204 | ||
205 | ret = lttng_snapshot_list_output(current_session_name, &list); | |
206 | if (ret < 0) { | |
207 | goto error; | |
208 | } | |
209 | ||
210 | MSG("Snapshot output list for session %s", current_session_name); | |
211 | ||
212 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { | |
c3024823 | 213 | MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4, |
57f272ed DG |
214 | lttng_snapshot_output_get_id(s_iter), |
215 | lttng_snapshot_output_get_name(s_iter), | |
c3024823 DG |
216 | lttng_snapshot_output_get_ctrl_url(s_iter), |
217 | lttng_snapshot_output_get_maxsize(s_iter)); | |
57f272ed DG |
218 | output_seen = 1; |
219 | } | |
220 | ||
221 | lttng_snapshot_output_list_destroy(list); | |
222 | ||
223 | if (!output_seen) { | |
224 | MSG("%sNone", indent4); | |
225 | } | |
226 | ||
227 | error: | |
228 | return ret; | |
229 | } | |
230 | ||
50534d6f JRJ |
231 | /* |
232 | * Delete output by ID (machine interface version). | |
233 | */ | |
234 | static int mi_del_output(uint32_t id, const char *name) | |
235 | { | |
236 | int ret; | |
237 | struct lttng_snapshot_output *output = NULL; | |
238 | ||
239 | assert(writer); | |
240 | ||
241 | output = lttng_snapshot_output_create(); | |
242 | if (!output) { | |
243 | ret = CMD_FATAL; | |
244 | goto error; | |
245 | } | |
246 | ||
247 | if (name) { | |
248 | ret = lttng_snapshot_output_set_name(name, output); | |
249 | } else if (id != UINT32_MAX) { | |
250 | ret = lttng_snapshot_output_set_id(id, output); | |
251 | } else { | |
252 | ret = CMD_ERROR; | |
253 | goto error; | |
254 | } | |
255 | if (ret < 0) { | |
256 | ret = CMD_FATAL; | |
257 | goto error; | |
258 | } | |
259 | ||
260 | ret = lttng_snapshot_del_output(current_session_name, output); | |
261 | if (ret < 0) { | |
50534d6f JRJ |
262 | goto error; |
263 | } | |
264 | ||
265 | ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name); | |
266 | if (ret) { | |
267 | ret = CMD_ERROR; | |
268 | } | |
269 | ||
270 | error: | |
271 | lttng_snapshot_output_destroy(output); | |
272 | return ret; | |
273 | } | |
274 | ||
57f272ed DG |
275 | /* |
276 | * Delete output by ID. | |
277 | */ | |
eb240553 | 278 | static int del_output(uint32_t id, const char *name) |
57f272ed DG |
279 | { |
280 | int ret; | |
281 | struct lttng_snapshot_output *output = NULL; | |
282 | ||
283 | output = lttng_snapshot_output_create(); | |
284 | if (!output) { | |
285 | ret = CMD_FATAL; | |
286 | goto error; | |
287 | } | |
288 | ||
eb240553 DG |
289 | if (name) { |
290 | ret = lttng_snapshot_output_set_name(name, output); | |
291 | } else if (id != UINT32_MAX) { | |
292 | ret = lttng_snapshot_output_set_id(id, output); | |
293 | } else { | |
294 | ret = CMD_ERROR; | |
295 | goto error; | |
296 | } | |
57f272ed DG |
297 | if (ret < 0) { |
298 | ret = CMD_FATAL; | |
299 | goto error; | |
300 | } | |
301 | ||
302 | ret = lttng_snapshot_del_output(current_session_name, output); | |
303 | if (ret < 0) { | |
304 | goto error; | |
305 | } | |
306 | ||
eb240553 DG |
307 | if (id != UINT32_MAX) { |
308 | MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s", | |
309 | id, current_session_name); | |
310 | } else { | |
311 | MSG("Snapshot output %s successfully deleted for session %s", | |
312 | name, current_session_name); | |
313 | } | |
57f272ed DG |
314 | |
315 | error: | |
316 | lttng_snapshot_output_destroy(output); | |
317 | return ret; | |
318 | } | |
319 | ||
50534d6f JRJ |
320 | /* |
321 | * Add output from the user URL (machine interface). | |
322 | */ | |
323 | static int mi_add_output(const char *url) | |
324 | { | |
325 | int ret; | |
326 | struct lttng_snapshot_output *output = NULL; | |
327 | char name[NAME_MAX]; | |
328 | const char *n_ptr; | |
329 | ||
330 | if (!url && (!opt_data_url || !opt_ctrl_url)) { | |
331 | ret = CMD_ERROR; | |
332 | goto error; | |
333 | } | |
334 | ||
335 | output = create_output_from_args(url); | |
336 | if (!output) { | |
337 | ret = CMD_FATAL; | |
338 | goto error; | |
339 | } | |
340 | ||
341 | /* This call, if successful, populates the id of the output object. */ | |
342 | ret = lttng_snapshot_add_output(current_session_name, output); | |
343 | if (ret < 0) { | |
50534d6f JRJ |
344 | goto error; |
345 | } | |
346 | ||
347 | n_ptr = lttng_snapshot_output_get_name(output); | |
348 | if (*n_ptr == '\0') { | |
349 | int pret; | |
350 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, | |
351 | lttng_snapshot_output_get_id(output)); | |
352 | if (pret < 0) { | |
353 | PERROR("snprintf add output name"); | |
354 | } | |
355 | n_ptr = name; | |
356 | } | |
357 | ||
358 | ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr, | |
359 | output); | |
360 | if (ret) { | |
361 | ret = CMD_ERROR; | |
362 | } | |
363 | ||
364 | error: | |
365 | lttng_snapshot_output_destroy(output); | |
366 | return ret; | |
367 | } | |
368 | ||
57f272ed DG |
369 | /* |
370 | * Add output from the user URL. | |
371 | */ | |
372 | static int add_output(const char *url) | |
373 | { | |
374 | int ret; | |
375 | struct lttng_snapshot_output *output = NULL; | |
6efe784e DG |
376 | char name[NAME_MAX]; |
377 | const char *n_ptr; | |
57f272ed DG |
378 | |
379 | if (!url && (!opt_data_url || !opt_ctrl_url)) { | |
380 | ret = CMD_ERROR; | |
381 | goto error; | |
382 | } | |
383 | ||
384 | output = create_output_from_args(url); | |
385 | if (!output) { | |
386 | ret = CMD_FATAL; | |
387 | goto error; | |
388 | } | |
389 | ||
390 | /* This call, if successful, populates the id of the output object. */ | |
391 | ret = lttng_snapshot_add_output(current_session_name, output); | |
392 | if (ret < 0) { | |
393 | goto error; | |
394 | } | |
395 | ||
6efe784e DG |
396 | n_ptr = lttng_snapshot_output_get_name(output); |
397 | if (*n_ptr == '\0') { | |
398 | int pret; | |
399 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, | |
400 | lttng_snapshot_output_get_id(output)); | |
401 | if (pret < 0) { | |
402 | PERROR("snprintf add output name"); | |
403 | } | |
404 | n_ptr = name; | |
405 | } | |
406 | ||
57f272ed DG |
407 | MSG("Snapshot output successfully added for session %s", |
408 | current_session_name); | |
409 | MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", | |
6efe784e | 410 | lttng_snapshot_output_get_id(output), n_ptr, |
57f272ed DG |
411 | lttng_snapshot_output_get_ctrl_url(output), |
412 | lttng_snapshot_output_get_maxsize(output)); | |
413 | error: | |
414 | lttng_snapshot_output_destroy(output); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static int cmd_add_output(int argc, const char **argv) | |
419 | { | |
50534d6f | 420 | int ret; |
57f272ed DG |
421 | |
422 | if (argc < 2 && (!opt_data_url || !opt_ctrl_url)) { | |
57f272ed DG |
423 | ret = CMD_ERROR; |
424 | goto end; | |
425 | } | |
426 | ||
50534d6f JRJ |
427 | if (lttng_opt_mi) { |
428 | ret = mi_add_output(argv[1]); | |
429 | } else { | |
430 | ret = add_output(argv[1]); | |
431 | } | |
57f272ed DG |
432 | |
433 | end: | |
434 | return ret; | |
435 | } | |
436 | ||
437 | static int cmd_del_output(int argc, const char **argv) | |
438 | { | |
50534d6f | 439 | int ret; |
eb240553 DG |
440 | char *name; |
441 | long id; | |
57f272ed DG |
442 | |
443 | if (argc < 2) { | |
57f272ed DG |
444 | ret = CMD_ERROR; |
445 | goto end; | |
446 | } | |
447 | ||
eb240553 DG |
448 | errno = 0; |
449 | id = strtol(argv[1], &name, 10); | |
450 | if (id == 0 && errno == 0) { | |
50534d6f JRJ |
451 | if (lttng_opt_mi) { |
452 | ret = mi_del_output(UINT32_MAX, name); | |
453 | } else { | |
454 | ret = del_output(UINT32_MAX, name); | |
455 | } | |
eb240553 | 456 | } else if (errno == 0 && *name == '\0') { |
50534d6f JRJ |
457 | if (lttng_opt_mi) { |
458 | ret = mi_del_output(id, NULL); | |
459 | } else { | |
460 | ret = del_output(id, NULL); | |
461 | } | |
eb240553 DG |
462 | } else { |
463 | ERR("Argument %s not recognized", argv[1]); | |
464 | ret = -1; | |
465 | goto end; | |
466 | } | |
57f272ed DG |
467 | |
468 | end: | |
469 | return ret; | |
470 | } | |
471 | ||
472 | static int cmd_list_output(int argc, const char **argv) | |
473 | { | |
50534d6f JRJ |
474 | int ret; |
475 | ||
476 | if (lttng_opt_mi) { | |
477 | ret = mi_list_output(); | |
478 | } else { | |
479 | ret = list_output(); | |
480 | } | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Do a snapshot record with the URL if one is given (machine interface). | |
487 | */ | |
488 | static int mi_record(const char *url) | |
489 | { | |
490 | int ret; | |
491 | struct lttng_snapshot_output *output = NULL; | |
492 | ||
493 | output = create_output_from_args(url); | |
494 | if (!output) { | |
495 | ret = CMD_FATAL; | |
496 | goto error; | |
497 | } | |
498 | ||
499 | ret = lttng_snapshot_record(current_session_name, output, 0); | |
500 | if (ret < 0) { | |
501 | ret = CMD_ERROR; | |
502 | goto error; | |
503 | } | |
504 | ||
505 | ret = mi_lttng_snapshot_record(writer, current_session_name, url, | |
506 | opt_ctrl_url, opt_data_url); | |
507 | if (ret) { | |
508 | ret = CMD_ERROR; | |
509 | } | |
510 | ||
511 | error: | |
512 | lttng_snapshot_output_destroy(output); | |
513 | return ret; | |
57f272ed DG |
514 | } |
515 | ||
516 | /* | |
517 | * Do a snapshot record with the URL if one is given. | |
518 | */ | |
519 | static int record(const char *url) | |
520 | { | |
521 | int ret; | |
522 | struct lttng_snapshot_output *output = NULL; | |
523 | ||
e1986656 DG |
524 | output = create_output_from_args(url); |
525 | if (!output) { | |
526 | ret = CMD_FATAL; | |
527 | goto error; | |
57f272ed DG |
528 | } |
529 | ||
530 | ret = lttng_snapshot_record(current_session_name, output, 0); | |
531 | if (ret < 0) { | |
68808f4e | 532 | if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) { |
d07ceecd | 533 | ERR("Invalid snapshot size. Cannot fit at least one packet per stream."); |
68808f4e | 534 | } |
57f272ed DG |
535 | goto error; |
536 | } | |
537 | ||
538 | MSG("Snapshot recorded successfully for session %s", current_session_name); | |
539 | ||
540 | if (url) { | |
541 | MSG("Snapshot written at: %s", url); | |
542 | } else if (opt_ctrl_url) { | |
543 | MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url, | |
544 | opt_data_url); | |
57f272ed DG |
545 | } |
546 | ||
547 | error: | |
cdcdb9dd | 548 | lttng_snapshot_output_destroy(output); |
57f272ed DG |
549 | return ret; |
550 | } | |
551 | ||
552 | static int cmd_record(int argc, const char **argv) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | if (argc == 2) { | |
557 | /* With a given URL */ | |
50534d6f JRJ |
558 | if (lttng_opt_mi) { |
559 | ret = mi_record(argv[1]); | |
560 | } else { | |
561 | ret = record(argv[1]); | |
562 | } | |
57f272ed | 563 | } else { |
50534d6f JRJ |
564 | if (lttng_opt_mi) { |
565 | ret = mi_record(NULL); | |
566 | } else { | |
567 | ret = record(NULL); | |
568 | } | |
57f272ed DG |
569 | } |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
574 | static int handle_command(const char **argv) | |
575 | { | |
50534d6f | 576 | int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS; |
57f272ed DG |
577 | struct cmd_struct *cmd; |
578 | ||
579 | if (argv == NULL || (!opt_ctrl_url && opt_data_url) || | |
580 | (opt_ctrl_url && !opt_data_url)) { | |
50534d6f | 581 | command_ret = CMD_ERROR; |
57f272ed DG |
582 | goto end; |
583 | } | |
584 | ||
585 | argc = count_arguments(argv); | |
586 | ||
587 | cmd = &actions[i]; | |
588 | while (cmd->func != NULL) { | |
589 | /* Find command */ | |
590 | if (strcmp(argv[0], cmd->name) == 0) { | |
50534d6f JRJ |
591 | if (lttng_opt_mi) { |
592 | /* Action element */ | |
593 | ret = mi_lttng_writer_open_element(writer, | |
594 | mi_lttng_element_command_action); | |
595 | if (ret) { | |
596 | ret = CMD_ERROR; | |
597 | goto end; | |
598 | } | |
599 | ||
600 | /* Name of the action */ | |
601 | ret = mi_lttng_writer_write_element_string(writer, | |
602 | config_element_name, argv[0]); | |
603 | if (ret) { | |
604 | ret = CMD_ERROR; | |
605 | goto end; | |
606 | } | |
607 | ||
608 | /* Open output element */ | |
609 | ret = mi_lttng_writer_open_element(writer, | |
610 | mi_lttng_element_command_output); | |
611 | if (ret) { | |
612 | ret = CMD_ERROR; | |
613 | goto end; | |
614 | } | |
615 | } | |
616 | ||
617 | command_ret = cmd->func(argc, argv); | |
618 | ||
619 | if (lttng_opt_mi) { | |
620 | /* Close output and action element */ | |
621 | ret = mi_lttng_close_multi_element(writer, 2); | |
622 | if (ret) { | |
623 | ret = CMD_ERROR; | |
624 | goto end; | |
625 | } | |
626 | } | |
57f272ed DG |
627 | goto end; |
628 | } | |
629 | i++; | |
630 | cmd = &actions[i]; | |
631 | } | |
632 | ||
1ec06ed3 | 633 | ret = CMD_UNDEFINED; |
57f272ed DG |
634 | |
635 | end: | |
1ec06ed3 | 636 | /* Overwrite ret if an error occurred in cmd->func() */ |
50534d6f | 637 | ret = command_ret ? command_ret : ret; |
57f272ed DG |
638 | return ret; |
639 | } | |
57f272ed DG |
640 | /* |
641 | * The 'snapshot <cmd> <options>' first level command | |
642 | */ | |
643 | int cmd_snapshot(int argc, const char **argv) | |
644 | { | |
50534d6f | 645 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
57f272ed DG |
646 | char *session_name = NULL; |
647 | static poptContext pc; | |
648 | ||
649 | pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0); | |
650 | poptReadDefaultConfig(pc, 0); | |
651 | ||
50534d6f | 652 | /* Mi check */ |
c7e35b03 | 653 | if (lttng_opt_mi) { |
50534d6f JRJ |
654 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
655 | if (!writer) { | |
656 | ret = -LTTNG_ERR_NOMEM; | |
657 | goto end; | |
658 | } | |
659 | ||
660 | /* Open command element */ | |
661 | ret = mi_lttng_writer_command_open(writer, | |
662 | mi_lttng_element_command_snapshot); | |
663 | if (ret) { | |
664 | ret = CMD_ERROR; | |
665 | goto end; | |
666 | } | |
667 | ||
668 | /* Open output element */ | |
669 | ret = mi_lttng_writer_open_element(writer, | |
670 | mi_lttng_element_command_output); | |
671 | if (ret) { | |
672 | ret = CMD_ERROR; | |
673 | goto end; | |
674 | } | |
c7e35b03 JR |
675 | } |
676 | ||
57f272ed DG |
677 | while ((opt = poptGetNextOpt(pc)) != -1) { |
678 | switch (opt) { | |
679 | case OPT_HELP: | |
4ba92f18 | 680 | SHOW_HELP(); |
57f272ed DG |
681 | goto end; |
682 | case OPT_LIST_OPTIONS: | |
683 | list_cmd_options(stdout, snapshot_opts); | |
684 | goto end; | |
3c9bd23c SM |
685 | case OPT_LIST_COMMANDS: |
686 | list_commands(actions, stdout); | |
687 | goto end; | |
57f272ed DG |
688 | case OPT_MAX_SIZE: |
689 | { | |
a8f307d8 | 690 | uint64_t val; |
57f272ed DG |
691 | const char *opt = poptGetOptArg(pc); |
692 | ||
a8f307d8 | 693 | if (utils_parse_size_suffix((char *) opt, &val) < 0) { |
57f272ed DG |
694 | ERR("Unable to handle max-size value %s", opt); |
695 | ret = CMD_ERROR; | |
696 | goto end; | |
697 | } | |
698 | ||
57f272ed DG |
699 | opt_max_size = val; |
700 | ||
701 | break; | |
702 | } | |
703 | default: | |
57f272ed DG |
704 | ret = CMD_UNDEFINED; |
705 | goto end; | |
706 | } | |
707 | } | |
708 | ||
709 | if (!opt_session_name) { | |
710 | session_name = get_session_name(); | |
711 | if (session_name == NULL) { | |
712 | ret = CMD_ERROR; | |
713 | goto end; | |
714 | } | |
715 | current_session_name = session_name; | |
716 | } else { | |
717 | current_session_name = opt_session_name; | |
718 | } | |
719 | ||
50534d6f | 720 | command_ret = handle_command(poptGetArgs(pc)); |
1ec06ed3 | 721 | if (command_ret) { |
50534d6f | 722 | switch (-command_ret) { |
7badf927 | 723 | case LTTNG_ERR_EPERM: |
6dc3064a | 724 | ERR("The session needs to be set in no output mode (--no-output)"); |
7badf927 DG |
725 | break; |
726 | case LTTNG_ERR_SNAPSHOT_NODATA: | |
50534d6f | 727 | WARN("%s", lttng_strerror(command_ret)); |
b3cf44b5 JR |
728 | |
729 | /* A warning is fine since the user has no control on | |
730 | * whether or not applications (or the kernel) have | |
731 | * produced any event between the start of the tracing | |
732 | * session and the recording of the snapshot. MI wise | |
733 | * the command is not a success since nothing was | |
734 | * recorded. | |
735 | */ | |
736 | command_ret = 0; | |
7badf927 DG |
737 | break; |
738 | default: | |
50534d6f | 739 | ERR("%s", lttng_strerror(command_ret)); |
7badf927 | 740 | break; |
6dc3064a | 741 | } |
50534d6f JRJ |
742 | success = 0; |
743 | } | |
744 | ||
745 | if (lttng_opt_mi) { | |
746 | /* Close output element */ | |
747 | ret = mi_lttng_writer_close_element(writer); | |
748 | if (ret) { | |
749 | ret = CMD_ERROR; | |
750 | goto end; | |
751 | } | |
752 | ||
753 | /* Success ? */ | |
754 | ret = mi_lttng_writer_write_element_bool(writer, | |
755 | mi_lttng_element_command_success, success); | |
756 | if (ret) { | |
757 | ret = CMD_ERROR; | |
758 | goto end; | |
759 | } | |
760 | ||
761 | /* Command element close */ | |
762 | ret = mi_lttng_writer_command_close(writer); | |
763 | if (ret) { | |
764 | ret = CMD_ERROR; | |
765 | goto end; | |
766 | } | |
57f272ed DG |
767 | } |
768 | ||
769 | end: | |
50534d6f JRJ |
770 | /* Mi clean-up */ |
771 | if (writer && mi_lttng_writer_destroy(writer)) { | |
772 | /* Preserve original error code */ | |
773 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
774 | } | |
775 | ||
57f272ed DG |
776 | if (!opt_session_name) { |
777 | free(session_name); | |
778 | } | |
50534d6f JRJ |
779 | |
780 | /* Overwrite ret if an error occured during handle_command */ | |
781 | ret = command_ret ? command_ret : ret; | |
57f272ed DG |
782 | poptFreeContext(pc); |
783 | return ret; | |
784 | } |