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Fix: resource leak in enable-event command
[lttng-tools.git] / src / bin / lttng / commands / enable_events.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 modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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 *
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.
16 */
17
18 #define _GNU_SOURCE
19 #include <popt.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26 #include <inttypes.h>
27 #include <ctype.h>
28
29 #include "../command.h"
30 #include <src/common/sessiond-comm/sessiond-comm.h>
31
32 static char *opt_event_list;
33 static int opt_event_type;
34 static const char *opt_loglevel;
35 static int opt_loglevel_type;
36 static int opt_kernel;
37 static char *opt_session_name;
38 static int opt_userspace;
39 static int opt_jul;
40 static int opt_enable_all;
41 static char *opt_probe;
42 static char *opt_function;
43 static char *opt_function_entry_symbol;
44 static char *opt_channel_name;
45 static char *opt_filter;
46 static char *opt_exclude;
47 #if 0
48 /* Not implemented yet */
49 static char *opt_cmd_name;
50 static pid_t opt_pid;
51 #endif
52
53 enum {
54 OPT_HELP = 1,
55 OPT_TRACEPOINT,
56 OPT_PROBE,
57 OPT_FUNCTION,
58 OPT_FUNCTION_ENTRY,
59 OPT_SYSCALL,
60 OPT_USERSPACE,
61 OPT_LOGLEVEL,
62 OPT_LOGLEVEL_ONLY,
63 OPT_LIST_OPTIONS,
64 OPT_FILTER,
65 OPT_EXCLUDE,
66 };
67
68 static struct lttng_handle *handle;
69
70 static struct poptOption long_options[] = {
71 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
72 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
73 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
74 {"all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
75 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
76 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
77 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
78 {"jul", 'j', POPT_ARG_VAL, &opt_jul, 1, 0, 0},
79 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
80 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
81 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
82 #if 0
83 /*
84 * Currently removed from lttng kernel tracer. Removed from
85 * lttng UI to discourage its use.
86 */
87 {"function:entry", 0, POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
88 #endif
89 {"syscall", 0, POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
90 {"loglevel", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
91 {"loglevel-only", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
92 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
93 {"filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
94 {"exclude", 'x', POPT_ARG_STRING, &opt_exclude, OPT_EXCLUDE, 0, 0},
95 {0, 0, 0, 0, 0, 0, 0}
96 };
97
98 /*
99 * usage
100 */
101 static void usage(FILE *ofp)
102 {
103 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [-k|-u] [OPTIONS] \n");
104 fprintf(ofp, "\n");
105 fprintf(ofp, "Options:\n");
106 fprintf(ofp, " -h, --help Show this help\n");
107 fprintf(ofp, " --list-options Simple listing of options\n");
108 fprintf(ofp, " -s, --session NAME Apply to session name\n");
109 fprintf(ofp, " -c, --channel NAME Apply to this channel\n");
110 fprintf(ofp, " -a, --all Enable all tracepoints and syscalls\n");
111 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
112 fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
113 fprintf(ofp, " -j, --jul Apply for Java application using JUL\n");
114 fprintf(ofp, "\n");
115 fprintf(ofp, "Event options:\n");
116 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
117 fprintf(ofp, " - userspace tracer supports wildcards at end of string.\n");
118 fprintf(ofp, " Don't forget to quote to deal with bash expansion.\n");
119 fprintf(ofp, " e.g.:\n");
120 fprintf(ofp, " \"*\"\n");
121 fprintf(ofp, " \"app_component:na*\"\n");
122 fprintf(ofp, " --probe (addr | symbol | symbol+offset)\n");
123 fprintf(ofp, " Dynamic probe.\n");
124 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
125 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
126 fprintf(ofp, " --function (addr | symbol | symbol+offset)\n");
127 fprintf(ofp, " Dynamic function entry/return probe.\n");
128 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
129 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
130 #if 0
131 fprintf(ofp, " --function:entry symbol\n");
132 fprintf(ofp, " Function tracer event\n");
133 #endif
134 fprintf(ofp, " --syscall System call event\n");
135 fprintf(ofp, "\n");
136 fprintf(ofp, " --loglevel name\n");
137 fprintf(ofp, " Tracepoint loglevel range from 0 to loglevel\n");
138 fprintf(ofp, " --loglevel-only name\n");
139 fprintf(ofp, " Tracepoint loglevel (only this loglevel)\n");
140 fprintf(ofp, "\n");
141 fprintf(ofp, " The loglevel or loglevel-only options should be\n");
142 fprintf(ofp, " combined with a tracepoint name or tracepoint\n");
143 fprintf(ofp, " wildcard.\n");
144 fprintf(ofp, " Available loglevels:\n");
145 fprintf(ofp, " (higher value is more verbose)\n");
146 fprintf(ofp, " TRACE_EMERG = 0\n");
147 fprintf(ofp, " TRACE_ALERT = 1\n");
148 fprintf(ofp, " TRACE_CRIT = 2\n");
149 fprintf(ofp, " TRACE_ERR = 3\n");
150 fprintf(ofp, " TRACE_WARNING = 4\n");
151 fprintf(ofp, " TRACE_NOTICE = 5\n");
152 fprintf(ofp, " TRACE_INFO = 6\n");
153 fprintf(ofp, " TRACE_DEBUG_SYSTEM = 7\n");
154 fprintf(ofp, " TRACE_DEBUG_PROGRAM = 8\n");
155 fprintf(ofp, " TRACE_DEBUG_PROCESS = 9\n");
156 fprintf(ofp, " TRACE_DEBUG_MODULE = 10\n");
157 fprintf(ofp, " TRACE_DEBUG_UNIT = 11\n");
158 fprintf(ofp, " TRACE_DEBUG_FUNCTION = 12\n");
159 fprintf(ofp, " TRACE_DEBUG_LINE = 13\n");
160 fprintf(ofp, " TRACE_DEBUG = 14\n");
161 fprintf(ofp, " (shortcuts such as \"system\" are allowed)\n");
162 fprintf(ofp, " -f, --filter \'expression\'\n");
163 fprintf(ofp, " Filter expression on event fields and context.\n");
164 fprintf(ofp, " Event recording depends on evaluation.\n");
165 fprintf(ofp, " Only specify on first activation of\n");
166 fprintf(ofp, " a given event within a session.\n");
167 fprintf(ofp, " Filter only allowed when enabling\n");
168 fprintf(ofp, " events within a session before tracing\n");
169 fprintf(ofp, " is started. If the filter fails to link\n");
170 fprintf(ofp, " with the event within the traced domain,\n");
171 fprintf(ofp, " the event will be discarded. Currently,\n");
172 fprintf(ofp, " filter is only implemented for the user-space\n");
173 fprintf(ofp, " tracer.\n");
174 fprintf(ofp, " Expression examples:.\n");
175 fprintf(ofp, " \n");
176 fprintf(ofp, " 'intfield > 500 && intfield < 503'\n");
177 fprintf(ofp, " '(strfield == \"test\" || intfield != 10) && intfield > 33'\n");
178 fprintf(ofp, " 'doublefield > 1.1 && intfield < 5.3'\n");
179 fprintf(ofp, " \n");
180 fprintf(ofp, " Wildcards are allowed at the end of strings:\n");
181 fprintf(ofp, " 'seqfield1 == \"te*\"'\n");
182 fprintf(ofp, " In string literals, the escape character is '\\'.\n");
183 fprintf(ofp, " Use '\\*' for the '*' character, and '\\\\' for\n");
184 fprintf(ofp, " the '\\' character. Wildcard match any sequence of,\n");
185 fprintf(ofp, " characters including an empty sub-string (match 0 or\n");
186 fprintf(ofp, " more characters).\n");
187 fprintf(ofp, "\n");
188 fprintf(ofp, " Context information can be used for filtering. The\n");
189 fprintf(ofp, " examples below show usage of context filtering on\n");
190 fprintf(ofp, " process name (with a wildcard), process ID range, and\n");
191 fprintf(ofp, " unique thread ID for filtering. The process and\n");
192 fprintf(ofp, " thread ID of running applications can be found under\n");
193 fprintf(ofp, " columns \"PID\" and \"LWP\" of the \"ps -eLf\" command.\n");
194 fprintf(ofp, "\n");
195 fprintf(ofp, " '$ctx.procname == \"demo*\"'\n");
196 fprintf(ofp, " '$ctx.vpid >= 4433 && $ctx.vpid < 4455'\n");
197 fprintf(ofp, " '$ctx.vtid == 1234'\n");
198 fprintf(ofp, " -x, --exclude LIST\n");
199 fprintf(ofp, " Add exclusions to UST tracepoints:\n");
200 fprintf(ofp, " Events that match any of the items\n");
201 fprintf(ofp, " in the comma-separated LIST are not\n");
202 fprintf(ofp, " enabled, even if they match a wildcard\n");
203 fprintf(ofp, " definition of the event.\n");
204 fprintf(ofp, "\n");
205 }
206
207 /*
208 * Parse probe options.
209 */
210 static int parse_probe_opts(struct lttng_event *ev, char *opt)
211 {
212 int ret;
213 char s_hex[19];
214 char name[LTTNG_SYMBOL_NAME_LEN];
215
216 if (opt == NULL) {
217 ret = -1;
218 goto end;
219 }
220
221 /* Check for symbol+offset */
222 ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
223 if (ret == 2) {
224 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
225 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
226 DBG("probe symbol %s", ev->attr.probe.symbol_name);
227 if (*s_hex == '\0') {
228 ERR("Invalid probe offset %s", s_hex);
229 ret = -1;
230 goto end;
231 }
232 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
233 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
234 ev->attr.probe.addr = 0;
235 goto end;
236 }
237
238 /* Check for symbol */
239 if (isalpha(name[0])) {
240 ret = sscanf(opt, "%s", name);
241 if (ret == 1) {
242 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
243 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
244 DBG("probe symbol %s", ev->attr.probe.symbol_name);
245 ev->attr.probe.offset = 0;
246 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
247 ev->attr.probe.addr = 0;
248 goto end;
249 }
250 }
251
252 /* Check for address */
253 ret = sscanf(opt, "%s", s_hex);
254 if (ret > 0) {
255 if (*s_hex == '\0') {
256 ERR("Invalid probe address %s", s_hex);
257 ret = -1;
258 goto end;
259 }
260 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
261 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
262 ev->attr.probe.offset = 0;
263 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
264 goto end;
265 }
266
267 /* No match */
268 ret = -1;
269
270 end:
271 return ret;
272 }
273
274 /*
275 * Maps loglevel from string to value
276 */
277 static
278 int loglevel_str_to_value(const char *inputstr)
279 {
280 int i = 0;
281 char str[LTTNG_SYMBOL_NAME_LEN];
282
283 /*
284 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
285 * added at the end of the loop so a the upper bound we avoid the overflow.
286 */
287 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
288 str[i] = toupper(inputstr[i]);
289 i++;
290 }
291 str[i] = '\0';
292 if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
293 return LTTNG_LOGLEVEL_EMERG;
294 } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
295 return LTTNG_LOGLEVEL_ALERT;
296 } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
297 return LTTNG_LOGLEVEL_CRIT;
298 } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
299 return LTTNG_LOGLEVEL_ERR;
300 } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
301 return LTTNG_LOGLEVEL_WARNING;
302 } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
303 return LTTNG_LOGLEVEL_NOTICE;
304 } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
305 return LTTNG_LOGLEVEL_INFO;
306 } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
307 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
308 } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
309 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
310 } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
311 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
312 } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
313 return LTTNG_LOGLEVEL_DEBUG_MODULE;
314 } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
315 return LTTNG_LOGLEVEL_DEBUG_UNIT;
316 } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
317 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
318 } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
319 return LTTNG_LOGLEVEL_DEBUG_LINE;
320 } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
321 return LTTNG_LOGLEVEL_DEBUG;
322 } else {
323 return -1;
324 }
325 }
326
327 static
328 const char *print_channel_name(const char *name)
329 {
330 return name ? : DEFAULT_CHANNEL_NAME;
331 }
332
333 static
334 const char *print_raw_channel_name(const char *name)
335 {
336 return name ? : "<default>";
337 }
338
339 /*
340 * Return allocated string for pretty-printing exclusion names.
341 */
342 static
343 char *print_exclusions(int count, char **names)
344 {
345 int length = 0;
346 int i;
347 const char *preamble = " excluding ";
348 char *ret;
349
350 if (count == 0) {
351 return strdup("");
352 }
353
354 /* calculate total required length */
355 for (i = 0; i < count; i++) {
356 length += strlen(names[i]) + 1;
357 }
358
359 /* add length of preamble + one for NUL - one for last (missing) comma */
360 length += strlen(preamble);
361 ret = malloc(length);
362 strncpy(ret, preamble, length);
363 for (i = 0; i < count; i++) {
364 strcat(ret, names[i]);
365 if (i != count - 1) {
366 strcat(ret, ",");
367 }
368 }
369 return ret;
370 }
371
372 /*
373 * Compare list of exclusions against an event name.
374 * Return a list of legal exclusion names.
375 * Produce an error or a warning about others (depending on the situation)
376 */
377 static
378 int check_exclusion_subsets(const char *event_name,
379 const char *exclusions,
380 int *exclusion_count_ptr,
381 char ***exclusion_list_ptr)
382 {
383 const char *excluder_ptr;
384 const char *event_ptr;
385 const char *next_excluder;
386 int excluder_length;
387 int exclusion_count = 0;
388 char **exclusion_list = NULL;
389 int ret = CMD_SUCCESS;
390
391 if (event_name[strlen(event_name) - 1] != '*') {
392 ERR("Event %s: Excluders can only be used with wildcarded events", event_name);
393 goto error;
394 }
395
396 next_excluder = exclusions;
397 while (*next_excluder != 0) {
398 event_ptr = event_name;
399 excluder_ptr = next_excluder;
400 excluder_length = strcspn(next_excluder, ",");
401
402 /* Scan both the excluder and the event letter by letter */
403 while (1) {
404 char e, x;
405
406 e = *event_ptr;
407 x = *excluder_ptr;
408
409 if (x == '*') {
410 /* Event is a subset of the excluder */
411 ERR("Event %s: %.*s excludes all events from %s",
412 event_name,
413 excluder_length,
414 next_excluder,
415 event_name);
416 goto error;
417 }
418 if (e == '*') {
419 /* Excluder is a proper subset of event */
420 exclusion_count++;
421 exclusion_list = realloc(exclusion_list, sizeof(char **) * exclusion_count);
422 exclusion_list[exclusion_count - 1] = strndup(next_excluder, excluder_length);
423
424 break;
425 }
426 if (x != e) {
427 /* Excluder and event sets have no common elements */
428 WARN("Event %s: %.*s does not exclude any events from %s",
429 event_name,
430 excluder_length,
431 next_excluder,
432 event_name);
433 break;
434 }
435 excluder_ptr++;
436 event_ptr++;
437 }
438 /* next excluder */
439 next_excluder += excluder_length;
440 if (*next_excluder == ',') {
441 next_excluder++;
442 }
443 }
444 goto end;
445 error:
446 while (exclusion_count--) {
447 free(exclusion_list[exclusion_count]);
448 }
449 if (exclusion_list != NULL) {
450 free(exclusion_list);
451 }
452 exclusion_list = NULL;
453 exclusion_count = 0;
454 ret = CMD_ERROR;
455 end:
456 *exclusion_count_ptr = exclusion_count;
457 *exclusion_list_ptr = exclusion_list;
458 return ret;
459 }
460 /*
461 * Enabling event using the lttng API.
462 */
463 static int enable_events(char *session_name)
464 {
465 int ret = CMD_SUCCESS, warn = 0;
466 char *event_name, *channel_name = NULL;
467 struct lttng_event ev;
468 struct lttng_domain dom;
469 int exclusion_count = 0;
470 char **exclusion_list = NULL;
471
472 memset(&ev, 0, sizeof(ev));
473 memset(&dom, 0, sizeof(dom));
474
475 if (opt_kernel) {
476 if (opt_filter) {
477 ERR("Filter not implement for kernel tracing yet");
478 ret = CMD_ERROR;
479 goto error;
480 }
481 if (opt_loglevel) {
482 WARN("Kernel loglevels are not supported.");
483 }
484 }
485
486 /* Create lttng domain */
487 if (opt_kernel) {
488 dom.type = LTTNG_DOMAIN_KERNEL;
489 dom.buf_type = LTTNG_BUFFER_GLOBAL;
490 } else if (opt_userspace) {
491 dom.type = LTTNG_DOMAIN_UST;
492 /* Default. */
493 dom.buf_type = LTTNG_BUFFER_PER_UID;
494 } else if (opt_jul) {
495 dom.type = LTTNG_DOMAIN_JUL;
496 /* Default. */
497 dom.buf_type = LTTNG_BUFFER_PER_UID;
498 } else {
499 print_missing_domain();
500 ret = CMD_ERROR;
501 goto error;
502 }
503
504 if (opt_kernel && opt_exclude) {
505 ERR("Event name exclusions are not yet implemented for kernel events");
506 ret = CMD_ERROR;
507 goto error;
508 }
509
510 channel_name = opt_channel_name;
511
512 handle = lttng_create_handle(session_name, &dom);
513 if (handle == NULL) {
514 ret = -1;
515 goto error;
516 }
517
518 if (opt_enable_all) {
519 /* Default setup for enable all */
520 if (opt_kernel) {
521 ev.type = opt_event_type;
522 ev.name[0] = '\0';
523 /* kernel loglevels not implemented */
524 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
525 } else {
526 ev.type = LTTNG_EVENT_TRACEPOINT;
527 strcpy(ev.name, "*");
528 ev.loglevel_type = opt_loglevel_type;
529 if (opt_loglevel) {
530 ev.loglevel = loglevel_str_to_value(opt_loglevel);
531 if (ev.loglevel == -1) {
532 ERR("Unknown loglevel %s", opt_loglevel);
533 ret = -LTTNG_ERR_INVALID;
534 goto error;
535 }
536 } else {
537 ev.loglevel = -1;
538 }
539 }
540
541 if (opt_exclude) {
542 ret = check_exclusion_subsets("*", opt_exclude,
543 &exclusion_count, &exclusion_list);
544 if (ret == CMD_ERROR) {
545 goto error;
546 }
547 }
548 if (!opt_filter) {
549 ret = lttng_enable_event_with_exclusions(handle,
550 &ev, channel_name,
551 NULL,
552 exclusion_count, exclusion_list);
553 if (ret < 0) {
554 switch (-ret) {
555 case LTTNG_ERR_KERN_EVENT_EXIST:
556 WARN("Kernel events already enabled (channel %s, session %s)",
557 print_channel_name(channel_name), session_name);
558 break;
559 default:
560 ERR("Events: %s (channel %s, session %s)",
561 lttng_strerror(ret),
562 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
563 ? print_raw_channel_name(channel_name)
564 : print_channel_name(channel_name),
565 session_name);
566 break;
567 }
568 goto end;
569 }
570
571 switch (opt_event_type) {
572 case LTTNG_EVENT_TRACEPOINT:
573 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
574 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
575 MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
576 get_domain_str(dom.type),
577 exclusion_string,
578 print_channel_name(channel_name),
579 opt_loglevel);
580 free(exclusion_string);
581 } else {
582 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
583 MSG("All %s tracepoints%s are enabled in channel %s",
584 get_domain_str(dom.type),
585 exclusion_string,
586 print_channel_name(channel_name));
587 free(exclusion_string);
588 }
589 break;
590 case LTTNG_EVENT_SYSCALL:
591 if (opt_kernel) {
592 MSG("All kernel system calls are enabled in channel %s",
593 print_channel_name(channel_name));
594 }
595 break;
596 case LTTNG_EVENT_ALL:
597 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
598 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
599 MSG("All %s events%s are enabled in channel %s for loglevel %s",
600 get_domain_str(dom.type),
601 exclusion_string,
602 print_channel_name(channel_name),
603 opt_loglevel);
604 free(exclusion_string);
605 } else {
606 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
607 MSG("All %s events%s are enabled in channel %s",
608 get_domain_str(dom.type),
609 exclusion_string,
610 print_channel_name(channel_name));
611 free(exclusion_string);
612 }
613 break;
614 default:
615 /*
616 * We should not be here since lttng_enable_event should have
617 * failed on the event type.
618 */
619 goto error;
620 }
621 }
622 if (opt_filter) {
623 ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
624 opt_filter, exclusion_count, exclusion_list);
625 if (ret < 0) {
626 switch (-ret) {
627 case LTTNG_ERR_FILTER_EXIST:
628 WARN("Filter on all events is already enabled"
629 " (channel %s, session %s)",
630 print_channel_name(channel_name), session_name);
631 break;
632 default:
633 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
634 lttng_strerror(ret),
635 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
636 ? print_raw_channel_name(channel_name)
637 : print_channel_name(channel_name),
638 session_name, opt_filter);
639 break;
640 }
641 goto error;
642 } else {
643 MSG("Filter '%s' successfully set", opt_filter);
644 }
645 }
646 goto end;
647 }
648
649 /* Strip event list */
650 event_name = strtok(opt_event_list, ",");
651 while (event_name != NULL) {
652 /* Copy name and type of the event */
653 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
654 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
655 ev.type = opt_event_type;
656
657 /* Kernel tracer action */
658 if (opt_kernel) {
659 DBG("Enabling kernel event %s for channel %s",
660 event_name,
661 print_channel_name(channel_name));
662
663 switch (opt_event_type) {
664 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
665 ev.type = LTTNG_EVENT_TRACEPOINT;
666 /* Fall-through */
667 case LTTNG_EVENT_TRACEPOINT:
668 break;
669 case LTTNG_EVENT_PROBE:
670 ret = parse_probe_opts(&ev, opt_probe);
671 if (ret < 0) {
672 ERR("Unable to parse probe options");
673 ret = 0;
674 goto error;
675 }
676 break;
677 case LTTNG_EVENT_FUNCTION:
678 ret = parse_probe_opts(&ev, opt_function);
679 if (ret < 0) {
680 ERR("Unable to parse function probe options");
681 ret = 0;
682 goto error;
683 }
684 break;
685 case LTTNG_EVENT_FUNCTION_ENTRY:
686 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
687 LTTNG_SYMBOL_NAME_LEN);
688 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
689 break;
690 case LTTNG_EVENT_SYSCALL:
691 MSG("per-syscall selection not supported yet. Use \"-a\" "
692 "for all syscalls.");
693 default:
694 ret = CMD_UNDEFINED;
695 goto error;
696 }
697
698 /* kernel loglevels not implemented */
699 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
700 } else if (opt_userspace) { /* User-space tracer action */
701 #if 0
702 if (opt_cmd_name != NULL || opt_pid) {
703 MSG("Only supporting tracing all UST processes (-u) for now.");
704 ret = CMD_UNDEFINED;
705 goto error;
706 }
707 #endif
708
709 DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
710 print_channel_name(channel_name), opt_loglevel ? : "<all>");
711
712 switch (opt_event_type) {
713 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
714 /* Fall-through */
715 case LTTNG_EVENT_TRACEPOINT:
716 /* Copy name and type of the event */
717 ev.type = LTTNG_EVENT_TRACEPOINT;
718 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
719 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
720 break;
721 case LTTNG_EVENT_PROBE:
722 case LTTNG_EVENT_FUNCTION:
723 case LTTNG_EVENT_FUNCTION_ENTRY:
724 case LTTNG_EVENT_SYSCALL:
725 default:
726 ERR("Event type not available for user-space tracing");
727 ret = CMD_UNSUPPORTED;
728 goto error;
729 }
730
731 if (opt_exclude) {
732 if (opt_event_type != LTTNG_EVENT_ALL && opt_event_type != LTTNG_EVENT_TRACEPOINT) {
733 ERR("Exclusion option can only be used with tracepoint events");
734 ret = CMD_ERROR;
735 goto error;
736 }
737 /* Free previously allocated items */
738 if (exclusion_list != NULL) {
739 while (exclusion_count--) {
740 free(exclusion_list[exclusion_count]);
741 }
742 free(exclusion_list);
743 exclusion_list = NULL;
744 }
745 /* Check for proper subsets */
746 ret = check_exclusion_subsets(event_name, opt_exclude,
747 &exclusion_count, &exclusion_list);
748 if (ret == CMD_ERROR) {
749 goto error;
750 }
751 }
752
753 ev.loglevel_type = opt_loglevel_type;
754 if (opt_loglevel) {
755 ev.loglevel = loglevel_str_to_value(opt_loglevel);
756 if (ev.loglevel == -1) {
757 ERR("Unknown loglevel %s", opt_loglevel);
758 ret = -LTTNG_ERR_INVALID;
759 goto error;
760 }
761 } else {
762 ev.loglevel = -1;
763 }
764 } else if (opt_jul) {
765 if (opt_event_type != LTTNG_EVENT_ALL &&
766 opt_event_type != LTTNG_EVENT_TRACEPOINT) {
767 ERR("Event type not supported for JUL domain.");
768 ret = CMD_UNSUPPORTED;
769 goto error;
770 }
771 ev.type = LTTNG_EVENT_TRACEPOINT;
772 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
773 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
774 } else {
775 print_missing_domain();
776 ret = CMD_ERROR;
777 goto error;
778 }
779
780 if (!opt_filter) {
781 char *exclusion_string;
782
783 ret = lttng_enable_event_with_exclusions(handle,
784 &ev, channel_name,
785 NULL, exclusion_count, exclusion_list);
786 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
787 if (ret < 0) {
788 /* Turn ret to positive value to handle the positive error code */
789 switch (-ret) {
790 case LTTNG_ERR_KERN_EVENT_EXIST:
791 WARN("Kernel event %s%s already enabled (channel %s, session %s)",
792 event_name,
793 exclusion_string,
794 print_channel_name(channel_name), session_name);
795 break;
796 default:
797 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
798 exclusion_string,
799 lttng_strerror(ret),
800 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
801 ? print_raw_channel_name(channel_name)
802 : print_channel_name(channel_name),
803 session_name);
804 break;
805 }
806 warn = 1;
807 } else {
808 MSG("%s event %s%s created in channel %s",
809 get_domain_str(dom.type), event_name,
810 exclusion_string,
811 print_channel_name(channel_name));
812 }
813 free(exclusion_string);
814 }
815
816 if (opt_filter) {
817 char *exclusion_string;
818
819 ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
820 opt_filter, exclusion_count, exclusion_list);
821 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
822
823 if (ret < 0) {
824 switch (-ret) {
825 case LTTNG_ERR_FILTER_EXIST:
826 WARN("Filter on event %s%s is already enabled"
827 " (channel %s, session %s)",
828 event_name,
829 exclusion_string,
830 print_channel_name(channel_name), session_name);
831 break;
832 default:
833 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
834 exclusion_string,
835 lttng_strerror(ret),
836 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
837 ? print_raw_channel_name(channel_name)
838 : print_channel_name(channel_name),
839 session_name, opt_filter);
840 break;
841 }
842 free(exclusion_string);
843 goto error;
844 } else {
845 MSG("Event %s%s: Filter '%s' successfully set",
846 event_name, exclusion_string,
847 opt_filter);
848 }
849 free(exclusion_string);
850 }
851
852 /* Next event */
853 event_name = strtok(NULL, ",");
854 }
855
856 end:
857 error:
858 if (warn) {
859 ret = CMD_WARNING;
860 }
861 lttng_destroy_handle(handle);
862
863 if (exclusion_list != NULL) {
864 while (exclusion_count--) {
865 free(exclusion_list[exclusion_count]);
866 }
867 free(exclusion_list);
868 }
869
870 return ret;
871 }
872
873 /*
874 * Add event to trace session
875 */
876 int cmd_enable_events(int argc, const char **argv)
877 {
878 int opt, ret = CMD_SUCCESS;
879 static poptContext pc;
880 char *session_name = NULL;
881 int event_type = -1;
882
883 pc = poptGetContext(NULL, argc, argv, long_options, 0);
884 poptReadDefaultConfig(pc, 0);
885
886 /* Default event type */
887 opt_event_type = LTTNG_EVENT_ALL;
888
889 while ((opt = poptGetNextOpt(pc)) != -1) {
890 switch (opt) {
891 case OPT_HELP:
892 usage(stdout);
893 goto end;
894 case OPT_TRACEPOINT:
895 opt_event_type = LTTNG_EVENT_TRACEPOINT;
896 break;
897 case OPT_PROBE:
898 opt_event_type = LTTNG_EVENT_PROBE;
899 break;
900 case OPT_FUNCTION:
901 opt_event_type = LTTNG_EVENT_FUNCTION;
902 break;
903 case OPT_FUNCTION_ENTRY:
904 opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
905 break;
906 case OPT_SYSCALL:
907 opt_event_type = LTTNG_EVENT_SYSCALL;
908 break;
909 case OPT_USERSPACE:
910 opt_userspace = 1;
911 break;
912 case OPT_LOGLEVEL:
913 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
914 opt_loglevel = poptGetOptArg(pc);
915 break;
916 case OPT_LOGLEVEL_ONLY:
917 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
918 opt_loglevel = poptGetOptArg(pc);
919 break;
920 case OPT_LIST_OPTIONS:
921 list_cmd_options(stdout, long_options);
922 goto end;
923 case OPT_FILTER:
924 break;
925 case OPT_EXCLUDE:
926 break;
927 default:
928 usage(stderr);
929 ret = CMD_UNDEFINED;
930 goto end;
931 }
932
933 /* Validate event type. Multiple event type are not supported. */
934 if (event_type == -1) {
935 event_type = opt_event_type;
936 } else {
937 if (event_type != opt_event_type) {
938 ERR("Multiple event type not supported.");
939 ret = CMD_ERROR;
940 goto end;
941 }
942 }
943 }
944
945 opt_event_list = (char*) poptGetArg(pc);
946 if (opt_event_list == NULL && opt_enable_all == 0) {
947 ERR("Missing event name(s).\n");
948 usage(stderr);
949 ret = CMD_ERROR;
950 goto end;
951 }
952
953 if (!opt_session_name) {
954 session_name = get_session_name();
955 if (session_name == NULL) {
956 ret = CMD_ERROR;
957 goto end;
958 }
959 } else {
960 session_name = opt_session_name;
961 }
962
963 ret = enable_events(session_name);
964
965 end:
966 if (opt_session_name == NULL) {
967 free(session_name);
968 }
969
970 poptFreeContext(pc);
971 return ret;
972 }
LTTng tools - Deliverables
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