c0bd30f2245a1a3597e9e9699d500d925ea0a249
[lttng-tools.git] / src / bin / lttng / commands / list.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <inttypes.h>
21 #include <popt.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <assert.h>
26
27 #include "../command.h"
28
29 static int opt_userspace;
30 static int opt_kernel;
31 static char *opt_channel;
32 static int opt_domain;
33 #if 0
34 /* Not implemented yet */
35 static char *opt_cmd_name;
36 static pid_t opt_pid;
37 #endif
38
39 const char *indent4 = " ";
40 const char *indent6 = " ";
41 const char *indent8 = " ";
42
43 enum {
44 OPT_HELP = 1,
45 OPT_USERSPACE,
46 OPT_LIST_OPTIONS,
47 };
48
49 static struct lttng_handle *handle;
50
51 static struct poptOption long_options[] = {
52 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
53 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
54 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
55 #if 0
56 /* Not implemented yet */
57 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
58 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
59 #else
60 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
61 #endif
62 {"channel", 'c', POPT_ARG_STRING, &opt_channel, 0, 0, 0},
63 {"domain", 'd', POPT_ARG_VAL, &opt_domain, 1, 0, 0},
64 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
65 {0, 0, 0, 0, 0, 0, 0}
66 };
67
68 /*
69 * usage
70 */
71 static void usage(FILE *ofp)
72 {
73 fprintf(ofp, "usage: lttng list [OPTIONS] [SESSION [<OPTIONS>]]\n");
74 fprintf(ofp, "\n");
75 fprintf(ofp, "With no arguments, list available tracing session(s)\n");
76 fprintf(ofp, "\n");
77 fprintf(ofp, "Without a session, -k lists available kernel events\n");
78 fprintf(ofp, "Without a session, -u lists available userspace events\n");
79 fprintf(ofp, "\n");
80 fprintf(ofp, " -h, --help Show this help\n");
81 fprintf(ofp, " --list-options Simple listing of options\n");
82 fprintf(ofp, " -k, --kernel Select kernel domain\n");
83 fprintf(ofp, " -u, --userspace Select user-space domain.\n");
84 #if 0
85 fprintf(ofp, " -p, --pid PID List user-space events by PID\n");
86 #endif
87 fprintf(ofp, "\n");
88 fprintf(ofp, "Session Options:\n");
89 fprintf(ofp, " -c, --channel NAME List details of a channel\n");
90 fprintf(ofp, " -d, --domain List available domain(s)\n");
91 fprintf(ofp, "\n");
92 }
93
94 /*
95 * Get command line from /proc for a specific pid.
96 *
97 * On success, return an allocated string pointer to the proc cmdline.
98 * On error, return NULL.
99 */
100 static char *get_cmdline_by_pid(pid_t pid)
101 {
102 int ret;
103 FILE *fp;
104 char *cmdline = NULL;
105 char path[24]; /* Can't go bigger than /proc/65535/cmdline */
106
107 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
108 fp = fopen(path, "r");
109 if (fp == NULL) {
110 goto end;
111 }
112
113 /* Caller must free() *cmdline */
114 cmdline = malloc(PATH_MAX);
115 ret = fread(cmdline, 1, PATH_MAX, fp);
116 if (ret < 0) {
117 perror("fread proc list");
118 }
119 fclose(fp);
120
121 end:
122 return cmdline;
123 }
124
125 static
126 const char *active_string(int value)
127 {
128 switch (value) {
129 case 0: return " [inactive]";
130 case 1: return " [active]";
131 case -1: return "";
132 default: return NULL;
133 }
134 }
135
136 static
137 const char *enabled_string(int value)
138 {
139 switch (value) {
140 case 0: return " [disabled]";
141 case 1: return " [enabled]";
142 case -1: return "";
143 default: return NULL;
144 }
145 }
146
147 static
148 const char *loglevel_string_pre(int loglevel)
149 {
150 if (loglevel == -1) {
151 return "";
152 } else {
153 return " (loglevel: ";
154 }
155 }
156
157 static
158 const char *loglevel_string_post(int loglevel)
159 {
160 if (loglevel == -1) {
161 return "";
162 } else {
163 return ")";
164 }
165 }
166
167 static const char *loglevel_string(int value)
168 {
169 switch (value) {
170 case -1: return "";
171 case 0: return "TRACE_EMERG";
172 case 1: return "TRACE_ALERT";
173 case 2: return "TRACE_CRIT";
174 case 3: return "TRACE_ERR";
175 case 4: return "TRACE_WARNING";
176 case 5: return "TRACE_NOTICE";
177 case 6: return "TRACE_INFO";
178 case 7: return "TRACE_SYSTEM";
179 case 8: return "TRACE_PROGRAM";
180 case 9: return "TRACE_PROCESS";
181 case 10: return "TRACE_MODULE";
182 case 11: return "TRACE_UNIT";
183 case 12: return "TRACE_FUNCTION";
184 case 13: return "TRACE_DEFAULT";
185 case 14: return "TRACE_VERBOSE";
186 case 15: return "TRACE_DEBUG";
187 default: return "<<UNKNOWN>>";
188 }
189 }
190
191 /*
192 * Pretty print single event.
193 */
194 static void print_events(struct lttng_event *event)
195 {
196 switch (event->type) {
197 case LTTNG_EVENT_TRACEPOINT:
198 {
199 MSG("%s%s%s%s%d%s (type: tracepoint)%s", indent6,
200 event->name,
201 loglevel_string_pre(event->loglevel),
202 loglevel_string(event->loglevel),
203 event->loglevel,
204 loglevel_string_post(event->loglevel),
205 enabled_string(event->enabled));
206 break;
207 }
208 case LTTNG_EVENT_PROBE:
209 MSG("%s%s (type: probe)%s", indent6,
210 event->name, enabled_string(event->enabled));
211 if (event->attr.probe.addr != 0) {
212 MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
213 } else {
214 MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
215 MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
216 }
217 break;
218 case LTTNG_EVENT_FUNCTION:
219 case LTTNG_EVENT_FUNCTION_ENTRY:
220 MSG("%s%s (type: function)%s", indent6,
221 event->name, enabled_string(event->enabled));
222 MSG("%ssymbol: \"%s\"", indent8, event->attr.ftrace.symbol_name);
223 break;
224 case LTTNG_EVENT_SYSCALL:
225 MSG("%s (type: syscall)%s", indent6,
226 enabled_string(event->enabled));
227 break;
228 case LTTNG_EVENT_NOOP:
229 MSG("%s (type: noop)%s", indent6,
230 enabled_string(event->enabled));
231 break;
232 case LTTNG_EVENT_ALL:
233 /* We should never have "all" events in list. */
234 assert(0);
235 break;
236 }
237 }
238
239 /*
240 * Ask session daemon for all user space tracepoints available.
241 */
242 static int list_ust_events(void)
243 {
244 int i, size;
245 struct lttng_domain domain;
246 struct lttng_handle *handle;
247 struct lttng_event *event_list;
248 pid_t cur_pid = 0;
249
250 DBG("Getting UST tracing events");
251
252 domain.type = LTTNG_DOMAIN_UST;
253
254 handle = lttng_create_handle(NULL, &domain);
255 if (handle == NULL) {
256 goto error;
257 }
258
259 size = lttng_list_tracepoints(handle, &event_list);
260 if (size < 0) {
261 ERR("Unable to list UST events");
262 return size;
263 }
264
265 MSG("UST events:\n-------------");
266
267 if (size == 0) {
268 MSG("None");
269 }
270
271 for (i = 0; i < size; i++) {
272 if (cur_pid != event_list[i].pid) {
273 cur_pid = event_list[i].pid;
274 MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
275 }
276 print_events(&event_list[i]);
277 }
278
279 MSG("");
280
281 free(event_list);
282
283 return CMD_SUCCESS;
284
285 error:
286 return -1;
287 }
288
289 /*
290 * Ask for all trace events in the kernel and pretty print them.
291 */
292 static int list_kernel_events(void)
293 {
294 int i, size;
295 struct lttng_domain domain;
296 struct lttng_handle *handle;
297 struct lttng_event *event_list;
298
299 DBG("Getting kernel tracing events");
300
301 domain.type = LTTNG_DOMAIN_KERNEL;
302
303 handle = lttng_create_handle(NULL, &domain);
304 if (handle == NULL) {
305 goto error;
306 }
307
308 size = lttng_list_tracepoints(handle, &event_list);
309 if (size < 0) {
310 ERR("Unable to list kernel events");
311 return size;
312 }
313
314 MSG("Kernel events:\n-------------");
315
316 for (i = 0; i < size; i++) {
317 print_events(&event_list[i]);
318 }
319
320 MSG("");
321
322 free(event_list);
323
324 return CMD_SUCCESS;
325
326 error:
327 return -1;
328 }
329
330 /*
331 * List events of channel of session and domain.
332 */
333 static int list_events(const char *channel_name)
334 {
335 int ret, count, i;
336 struct lttng_event *events = NULL;
337
338 count = lttng_list_events(handle, channel_name, &events);
339 if (count < 0) {
340 ret = count;
341 goto error;
342 }
343
344 MSG("\n%sEvents:", indent4);
345 if (count == 0) {
346 MSG("%sNone\n", indent6);
347 goto end;
348 }
349
350 for (i = 0; i < count; i++) {
351 print_events(&events[i]);
352 }
353
354 MSG("");
355
356 end:
357 if (events) {
358 free(events);
359 }
360 ret = CMD_SUCCESS;
361
362 error:
363 return ret;
364 }
365
366 /*
367 * Pretty print channel
368 */
369 static void print_channel(struct lttng_channel *channel)
370 {
371 MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
372
373 MSG("%sAttributes:", indent4);
374 MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
375 MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
376 MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
377 MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
378 MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
379 switch (channel->attr.output) {
380 case LTTNG_EVENT_SPLICE:
381 MSG("%soutput: splice()", indent6);
382 break;
383 case LTTNG_EVENT_MMAP:
384 MSG("%soutput: mmap()", indent6);
385 break;
386 }
387 }
388
389 /*
390 * List channel(s) of session and domain.
391 *
392 * If channel_name is NULL, all channels are listed.
393 */
394 static int list_channels(const char *channel_name)
395 {
396 int count, i, ret = CMD_SUCCESS;
397 unsigned int chan_found = 0;
398 struct lttng_channel *channels = NULL;
399
400 DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
401
402 count = lttng_list_channels(handle, &channels);
403 if (count < 0) {
404 ret = count;
405 goto error_channels;
406 } else if (count == 0) {
407 ERR("Channel %s not found", channel_name);
408 goto error;
409 }
410
411 if (channel_name == NULL) {
412 MSG("Channels:\n-------------");
413 }
414
415 for (i = 0; i < count; i++) {
416 if (channel_name != NULL) {
417 if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
418 chan_found = 1;
419 } else {
420 continue;
421 }
422 }
423 print_channel(&channels[i]);
424
425 /* Listing events per channel */
426 ret = list_events(channels[i].name);
427 if (ret < 0) {
428 MSG("%s", lttng_strerror(ret));
429 }
430
431 if (chan_found) {
432 break;
433 }
434 }
435
436 if (!chan_found && channel_name != NULL) {
437 ERR("Channel %s not found", channel_name);
438 goto error;
439 }
440
441 ret = CMD_SUCCESS;
442
443 error:
444 free(channels);
445
446 error_channels:
447 return ret;
448 }
449
450 /*
451 * List available tracing session. List only basic information.
452 *
453 * If session_name is NULL, all sessions are listed.
454 */
455 static int list_sessions(const char *session_name)
456 {
457 int ret, count, i;
458 unsigned int session_found = 0;
459 struct lttng_session *sessions;
460
461 count = lttng_list_sessions(&sessions);
462 DBG("Session count %d", count);
463 if (count < 0) {
464 ret = count;
465 goto error;
466 }
467
468 if (session_name == NULL) {
469 MSG("Available tracing sessions:");
470 }
471
472 for (i = 0; i < count; i++) {
473 if (session_name != NULL) {
474 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
475 session_found = 1;
476 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
477 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
478 break;
479 }
480 continue;
481 }
482
483 MSG(" %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
484 active_string(sessions[i].enabled));
485
486 if (session_found) {
487 break;
488 }
489 }
490
491 free(sessions);
492
493 if (!session_found && session_name != NULL) {
494 ERR("Session '%s' not found", session_name);
495 ret = CMD_ERROR;
496 goto error;
497 }
498
499 if (session_name == NULL) {
500 MSG("\nUse lttng list <session_name> for more details");
501 }
502
503 return CMD_SUCCESS;
504
505 error:
506 return ret;
507 }
508
509 /*
510 * List available domain(s) for a session.
511 */
512 static int list_domains(const char *session_name)
513 {
514 int i, count, ret = CMD_SUCCESS;
515 struct lttng_domain *domains = NULL;
516
517 MSG("Domains:\n-------------");
518
519 count = lttng_list_domains(session_name, &domains);
520 if (count < 0) {
521 ret = count;
522 goto error;
523 } else if (count == 0) {
524 MSG(" None");
525 goto end;
526 }
527
528 for (i = 0; i < count; i++) {
529 switch (domains[i].type) {
530 case LTTNG_DOMAIN_KERNEL:
531 MSG(" - Kernel");
532 break;
533 case LTTNG_DOMAIN_UST:
534 MSG(" - UST global");
535 break;
536 default:
537 break;
538 }
539 }
540
541 end:
542 free(domains);
543
544 error:
545 return ret;
546 }
547
548 /*
549 * The 'list <options>' first level command
550 */
551 int cmd_list(int argc, const char **argv)
552 {
553 int opt, i, ret = CMD_SUCCESS;
554 int nb_domain;
555 const char *session_name;
556 static poptContext pc;
557 struct lttng_domain domain;
558 struct lttng_domain *domains = NULL;
559
560 if (argc < 1) {
561 usage(stderr);
562 ret = CMD_ERROR;
563 goto end;
564 }
565
566 pc = poptGetContext(NULL, argc, argv, long_options, 0);
567 poptReadDefaultConfig(pc, 0);
568
569 while ((opt = poptGetNextOpt(pc)) != -1) {
570 switch (opt) {
571 case OPT_HELP:
572 usage(stdout);
573 goto end;
574 case OPT_USERSPACE:
575 opt_userspace = 1;
576 break;
577 case OPT_LIST_OPTIONS:
578 list_cmd_options(stdout, long_options);
579 goto end;
580 default:
581 usage(stderr);
582 ret = CMD_UNDEFINED;
583 goto end;
584 }
585 }
586
587 /* Get session name (trailing argument) */
588 session_name = poptGetArg(pc);
589 DBG2("Session name: %s", session_name);
590
591 if (opt_kernel) {
592 domain.type = LTTNG_DOMAIN_KERNEL;
593 } else if (opt_userspace) {
594 DBG2("Listing userspace global domain");
595 domain.type = LTTNG_DOMAIN_UST;
596 }
597
598 handle = lttng_create_handle(session_name, &domain);
599 if (handle == NULL) {
600 ret = CMD_FATAL;
601 goto end;
602 }
603
604 if (session_name == NULL) {
605 if (!opt_kernel && !opt_userspace) {
606 ret = list_sessions(NULL);
607 if (ret != 0) {
608 goto end;
609 }
610 }
611 if (opt_kernel) {
612 ret = list_kernel_events();
613 if (ret < 0) {
614 goto end;
615 }
616 }
617 if (opt_userspace) {
618 ret = list_ust_events();
619 if (ret < 0) {
620 goto end;
621 }
622 }
623 } else {
624 /* List session attributes */
625 ret = list_sessions(session_name);
626 if (ret != 0) {
627 goto end;
628 }
629
630 /* Domain listing */
631 if (opt_domain) {
632 ret = list_domains(session_name);
633 goto end;
634 }
635
636 if (opt_kernel) {
637 /* Channel listing */
638 ret = list_channels(opt_channel);
639 if (ret < 0) {
640 goto end;
641 }
642 } else {
643 /* We want all domain(s) */
644 nb_domain = lttng_list_domains(session_name, &domains);
645 if (nb_domain < 0) {
646 ret = nb_domain;
647 goto end;
648 }
649
650 for (i = 0; i < nb_domain; i++) {
651 switch (domains[i].type) {
652 case LTTNG_DOMAIN_KERNEL:
653 MSG("=== Domain: Kernel ===\n");
654 break;
655 case LTTNG_DOMAIN_UST:
656 MSG("=== Domain: UST global ===\n");
657 break;
658 default:
659 MSG("=== Domain: Unimplemented ===\n");
660 break;
661 }
662
663 /* Clean handle before creating a new one */
664 lttng_destroy_handle(handle);
665
666 handle = lttng_create_handle(session_name, &domains[i]);
667 if (handle == NULL) {
668 ret = CMD_FATAL;
669 goto end;
670 }
671
672 ret = list_channels(opt_channel);
673 if (ret < 0) {
674 goto end;
675 }
676 }
677 }
678 }
679
680 end:
681 if (domains) {
682 free(domains);
683 }
684 lttng_destroy_handle(handle);
685
686 poptFreeContext(pc);
687 return ret;
688 }
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