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11eebc022d8085fd56a4ece4edcf8f0d3e5e02b6
[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 <assert.h>
20 #include <popt.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <inttypes.h>
28 #include <ctype.h>
29
30 #include "../command.h"
31 #include <src/common/sessiond-comm/sessiond-comm.h>
32
33 #if (LTTNG_SYMBOL_NAME_LEN == 256)
34 #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
35 #endif
36
37 static char *opt_event_list;
38 static int opt_event_type;
39 static const char *opt_loglevel;
40 static int opt_loglevel_type;
41 static int opt_kernel;
42 static char *opt_session_name;
43 static int opt_userspace;
44 static int opt_jul;
45 static int opt_enable_all;
46 static char *opt_probe;
47 static char *opt_function;
48 static char *opt_function_entry_symbol;
49 static char *opt_channel_name;
50 static char *opt_filter;
51 static char *opt_exclude;
52 #if 0
53 /* Not implemented yet */
54 static char *opt_cmd_name;
55 static pid_t opt_pid;
56 #endif
57
58 enum {
59 OPT_HELP = 1,
60 OPT_TRACEPOINT,
61 OPT_PROBE,
62 OPT_FUNCTION,
63 OPT_FUNCTION_ENTRY,
64 OPT_SYSCALL,
65 OPT_USERSPACE,
66 OPT_LOGLEVEL,
67 OPT_LOGLEVEL_ONLY,
68 OPT_LIST_OPTIONS,
69 OPT_FILTER,
70 OPT_EXCLUDE,
71 };
72
73 static struct lttng_handle *handle;
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 {"all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
80 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
81 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
82 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
83 {"jul", 'j', POPT_ARG_VAL, &opt_jul, 1, 0, 0},
84 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
85 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
86 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
87 #if 0
88 /*
89 * Currently removed from lttng kernel tracer. Removed from
90 * lttng UI to discourage its use.
91 */
92 {"function:entry", 0, POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
93 #endif
94 {"syscall", 0, POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
95 {"loglevel", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
96 {"loglevel-only", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
97 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
98 {"filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
99 {"exclude", 'x', POPT_ARG_STRING, &opt_exclude, OPT_EXCLUDE, 0, 0},
100 {0, 0, 0, 0, 0, 0, 0}
101 };
102
103 /*
104 * usage
105 */
106 static void usage(FILE *ofp)
107 {
108 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [-k|-u] [OPTIONS] \n");
109 fprintf(ofp, "\n");
110 fprintf(ofp, "Options:\n");
111 fprintf(ofp, " -h, --help Show this help\n");
112 fprintf(ofp, " --list-options Simple listing of options\n");
113 fprintf(ofp, " -s, --session NAME Apply to session name\n");
114 fprintf(ofp, " -c, --channel NAME Apply to this channel\n");
115 fprintf(ofp, " -a, --all Enable all tracepoints and syscalls\n");
116 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
117 fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
118 fprintf(ofp, " -j, --jul Apply for Java application using JUL\n");
119 fprintf(ofp, "\n");
120 fprintf(ofp, "Event options:\n");
121 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
122 fprintf(ofp, " - userspace tracer supports wildcards at end of string.\n");
123 fprintf(ofp, " Don't forget to quote to deal with bash expansion.\n");
124 fprintf(ofp, " e.g.:\n");
125 fprintf(ofp, " \"*\"\n");
126 fprintf(ofp, " \"app_component:na*\"\n");
127 fprintf(ofp, " --probe (addr | symbol | symbol+offset)\n");
128 fprintf(ofp, " Dynamic probe.\n");
129 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
130 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
131 fprintf(ofp, " --function (addr | symbol | symbol+offset)\n");
132 fprintf(ofp, " Dynamic function entry/return probe.\n");
133 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
134 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
135 #if 0
136 fprintf(ofp, " --function:entry symbol\n");
137 fprintf(ofp, " Function tracer event\n");
138 #endif
139 fprintf(ofp, " --syscall System call event\n");
140 fprintf(ofp, "\n");
141 fprintf(ofp, " --loglevel name\n");
142 fprintf(ofp, " Tracepoint loglevel range from 0 to loglevel.\n");
143 fprintf(ofp, " For JUL domain, see the table below for the range values.\n");
144 fprintf(ofp, " --loglevel-only name\n");
145 fprintf(ofp, " Tracepoint loglevel (only this loglevel)\n");
146 fprintf(ofp, "\n");
147 fprintf(ofp, " The loglevel or loglevel-only options should be\n");
148 fprintf(ofp, " combined with a tracepoint name or tracepoint\n");
149 fprintf(ofp, " wildcard.\n");
150 fprintf(ofp, " Available loglevels:\n");
151 fprintf(ofp, " (higher value is more verbose)\n");
152 fprintf(ofp, " TRACE_EMERG = 0\n");
153 fprintf(ofp, " TRACE_ALERT = 1\n");
154 fprintf(ofp, " TRACE_CRIT = 2\n");
155 fprintf(ofp, " TRACE_ERR = 3\n");
156 fprintf(ofp, " TRACE_WARNING = 4\n");
157 fprintf(ofp, " TRACE_NOTICE = 5\n");
158 fprintf(ofp, " TRACE_INFO = 6\n");
159 fprintf(ofp, " TRACE_DEBUG_SYSTEM = 7\n");
160 fprintf(ofp, " TRACE_DEBUG_PROGRAM = 8\n");
161 fprintf(ofp, " TRACE_DEBUG_PROCESS = 9\n");
162 fprintf(ofp, " TRACE_DEBUG_MODULE = 10\n");
163 fprintf(ofp, " TRACE_DEBUG_UNIT = 11\n");
164 fprintf(ofp, " TRACE_DEBUG_FUNCTION = 12\n");
165 fprintf(ofp, " TRACE_DEBUG_LINE = 13\n");
166 fprintf(ofp, " TRACE_DEBUG = 14\n");
167 fprintf(ofp, " (shortcuts such as \"system\" are allowed)\n");
168 fprintf(ofp, "\n");
169 fprintf(ofp, " Available JUL domain loglevels:\n");
170 fprintf(ofp, " JUL_OFF = INT32_MAX\n");
171 fprintf(ofp, " JUL_SEVERE = %d\n", LTTNG_LOGLEVEL_JUL_SEVERE);
172 fprintf(ofp, " JUL_WARNING = %d\n", LTTNG_LOGLEVEL_JUL_WARNING);
173 fprintf(ofp, " JUL_INFO = %d\n", LTTNG_LOGLEVEL_JUL_INFO);
174 fprintf(ofp, " JUL_CONFIG = %d\n", LTTNG_LOGLEVEL_JUL_CONFIG);
175 fprintf(ofp, " JUL_FINE = %d\n", LTTNG_LOGLEVEL_JUL_FINE);
176 fprintf(ofp, " JUL_FINER = %d\n", LTTNG_LOGLEVEL_JUL_FINER);
177 fprintf(ofp, " JUL_FINEST = %d\n", LTTNG_LOGLEVEL_JUL_FINEST);
178 fprintf(ofp, " JUL_ALL = INT32_MIN\n");
179 fprintf(ofp, " (shortcuts such as \"severe\" are allowed)\n");
180 fprintf(ofp, "\n");
181 fprintf(ofp, " -f, --filter \'expression\'\n");
182 fprintf(ofp, " Filter expression on event fields and context.\n");
183 fprintf(ofp, " Event recording depends on evaluation.\n");
184 fprintf(ofp, " Only specify on first activation of\n");
185 fprintf(ofp, " a given event within a session.\n");
186 fprintf(ofp, " Filter only allowed when enabling\n");
187 fprintf(ofp, " events within a session before tracing\n");
188 fprintf(ofp, " is started. If the filter fails to link\n");
189 fprintf(ofp, " with the event within the traced domain,\n");
190 fprintf(ofp, " the event will be discarded. Currently,\n");
191 fprintf(ofp, " filter is only implemented for the user-space\n");
192 fprintf(ofp, " tracer.\n");
193 fprintf(ofp, " Expression examples:.\n");
194 fprintf(ofp, " \n");
195 fprintf(ofp, " 'intfield > 500 && intfield < 503'\n");
196 fprintf(ofp, " '(strfield == \"test\" || intfield != 10) && intfield > 33'\n");
197 fprintf(ofp, " 'doublefield > 1.1 && intfield < 5.3'\n");
198 fprintf(ofp, " \n");
199 fprintf(ofp, " Wildcards are allowed at the end of strings:\n");
200 fprintf(ofp, " 'seqfield1 == \"te*\"'\n");
201 fprintf(ofp, " In string literals, the escape character is '\\'.\n");
202 fprintf(ofp, " Use '\\*' for the '*' character, and '\\\\' for\n");
203 fprintf(ofp, " the '\\' character. Wildcard match any sequence of,\n");
204 fprintf(ofp, " characters including an empty sub-string (match 0 or\n");
205 fprintf(ofp, " more characters).\n");
206 fprintf(ofp, "\n");
207 fprintf(ofp, " Context information can be used for filtering. The\n");
208 fprintf(ofp, " examples below show usage of context filtering on\n");
209 fprintf(ofp, " process name (with a wildcard), process ID range, and\n");
210 fprintf(ofp, " unique thread ID for filtering. The process and\n");
211 fprintf(ofp, " thread ID of running applications can be found under\n");
212 fprintf(ofp, " columns \"PID\" and \"LWP\" of the \"ps -eLf\" command.\n");
213 fprintf(ofp, "\n");
214 fprintf(ofp, " '$ctx.procname == \"demo*\"'\n");
215 fprintf(ofp, " '$ctx.vpid >= 4433 && $ctx.vpid < 4455'\n");
216 fprintf(ofp, " '$ctx.vtid == 1234'\n");
217 fprintf(ofp, " -x, --exclude LIST\n");
218 fprintf(ofp, " Add exclusions to UST tracepoints:\n");
219 fprintf(ofp, " Events that match any of the items\n");
220 fprintf(ofp, " in the comma-separated LIST are not\n");
221 fprintf(ofp, " enabled, even if they match a wildcard\n");
222 fprintf(ofp, " definition of the event.\n");
223 fprintf(ofp, "\n");
224 }
225
226 /*
227 * Parse probe options.
228 */
229 static int parse_probe_opts(struct lttng_event *ev, char *opt)
230 {
231 int ret = CMD_SUCCESS;
232 int match;
233 char s_hex[19];
234 #define S_HEX_LEN_SCANF_IS_A_BROKEN_API "18" /* 18 is (19 - 1) (\0 is extra) */
235 char name[LTTNG_SYMBOL_NAME_LEN];
236
237 if (opt == NULL) {
238 ret = CMD_ERROR;
239 goto end;
240 }
241
242 /* Check for symbol+offset */
243 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
244 "[^'+']+%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", name, s_hex);
245 if (match == 2) {
246 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
247 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
248 DBG("probe symbol %s", ev->attr.probe.symbol_name);
249 if (*s_hex == '\0') {
250 ERR("Invalid probe offset %s", s_hex);
251 ret = CMD_ERROR;
252 goto end;
253 }
254 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
255 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
256 ev->attr.probe.addr = 0;
257 goto end;
258 }
259
260 /* Check for symbol */
261 if (isalpha(name[0])) {
262 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "s",
263 name);
264 if (match == 1) {
265 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
266 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
267 DBG("probe symbol %s", ev->attr.probe.symbol_name);
268 ev->attr.probe.offset = 0;
269 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
270 ev->attr.probe.addr = 0;
271 goto end;
272 }
273 }
274
275 /* Check for address */
276 match = sscanf(opt, "%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", s_hex);
277 if (match > 0) {
278 if (*s_hex == '\0') {
279 ERR("Invalid probe address %s", s_hex);
280 ret = CMD_ERROR;
281 goto end;
282 }
283 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
284 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
285 ev->attr.probe.offset = 0;
286 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
287 goto end;
288 }
289
290 /* No match */
291 ret = CMD_ERROR;
292
293 end:
294 return ret;
295 }
296
297 /*
298 * Maps JUL loglevel from string to value
299 */
300 static int loglevel_jul_str_to_value(const char *inputstr)
301 {
302 int i = 0;
303 char str[LTTNG_SYMBOL_NAME_LEN];
304
305 /*
306 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
307 * added at the end of the loop so a the upper bound we avoid the overflow.
308 */
309 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
310 str[i] = toupper(inputstr[i]);
311 i++;
312 }
313 str[i] = '\0';
314
315 if (!strcmp(str, "JUL_OFF") || !strcmp(str, "OFF")) {
316 return LTTNG_LOGLEVEL_JUL_OFF;
317 } else if (!strcmp(str, "JUL_SEVERE") || !strcmp(str, "SEVERE")) {
318 return LTTNG_LOGLEVEL_JUL_SEVERE;
319 } else if (!strcmp(str, "JUL_WARNING") || !strcmp(str, "WARNING")) {
320 return LTTNG_LOGLEVEL_JUL_WARNING;
321 } else if (!strcmp(str, "JUL_INFO") || !strcmp(str, "INFO")) {
322 return LTTNG_LOGLEVEL_JUL_INFO;
323 } else if (!strcmp(str, "JUL_CONFIG") || !strcmp(str, "CONFIG")) {
324 return LTTNG_LOGLEVEL_JUL_CONFIG;
325 } else if (!strcmp(str, "JUL_FINE") || !strcmp(str, "FINE")) {
326 return LTTNG_LOGLEVEL_JUL_FINE;
327 } else if (!strcmp(str, "JUL_FINER") || !strcmp(str, "FINER")) {
328 return LTTNG_LOGLEVEL_JUL_FINER;
329 } else if (!strcmp(str, "JUL_FINEST") || !strcmp(str, "FINEST")) {
330 return LTTNG_LOGLEVEL_JUL_FINEST;
331 } else if (!strcmp(str, "JUL_ALL") || !strcmp(str, "ALL")) {
332 return LTTNG_LOGLEVEL_JUL_ALL;
333 } else {
334 return -1;
335 }
336 }
337
338 /*
339 * Maps loglevel from string to value
340 */
341 static
342 int loglevel_str_to_value(const char *inputstr)
343 {
344 int i = 0;
345 char str[LTTNG_SYMBOL_NAME_LEN];
346
347 /*
348 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
349 * added at the end of the loop so a the upper bound we avoid the overflow.
350 */
351 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
352 str[i] = toupper(inputstr[i]);
353 i++;
354 }
355 str[i] = '\0';
356 if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
357 return LTTNG_LOGLEVEL_EMERG;
358 } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
359 return LTTNG_LOGLEVEL_ALERT;
360 } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
361 return LTTNG_LOGLEVEL_CRIT;
362 } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
363 return LTTNG_LOGLEVEL_ERR;
364 } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
365 return LTTNG_LOGLEVEL_WARNING;
366 } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
367 return LTTNG_LOGLEVEL_NOTICE;
368 } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
369 return LTTNG_LOGLEVEL_INFO;
370 } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
371 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
372 } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
373 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
374 } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
375 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
376 } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
377 return LTTNG_LOGLEVEL_DEBUG_MODULE;
378 } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
379 return LTTNG_LOGLEVEL_DEBUG_UNIT;
380 } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
381 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
382 } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
383 return LTTNG_LOGLEVEL_DEBUG_LINE;
384 } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
385 return LTTNG_LOGLEVEL_DEBUG;
386 } else {
387 return -1;
388 }
389 }
390
391 static
392 const char *print_channel_name(const char *name)
393 {
394 return name ? : DEFAULT_CHANNEL_NAME;
395 }
396
397 static
398 const char *print_raw_channel_name(const char *name)
399 {
400 return name ? : "<default>";
401 }
402
403 /*
404 * Return allocated string for pretty-printing exclusion names.
405 */
406 static
407 char *print_exclusions(int count, char **names)
408 {
409 int length = 0;
410 int i;
411 const char *preamble = " excluding ";
412 char *ret;
413
414 if (count == 0) {
415 return strdup("");
416 }
417
418 /* calculate total required length */
419 for (i = 0; i < count; i++) {
420 length += strlen(names[i]) + 1;
421 }
422
423 /* add length of preamble + one for NUL - one for last (missing) comma */
424 length += strlen(preamble);
425 ret = malloc(length);
426 strncpy(ret, preamble, length);
427 for (i = 0; i < count; i++) {
428 strcat(ret, names[i]);
429 if (i != count - 1) {
430 strcat(ret, ",");
431 }
432 }
433 return ret;
434 }
435
436 /*
437 * Compare list of exclusions against an event name.
438 * Return a list of legal exclusion names.
439 * Produce an error or a warning about others (depending on the situation)
440 */
441 static
442 int check_exclusion_subsets(const char *event_name,
443 const char *exclusions,
444 int *exclusion_count_ptr,
445 char ***exclusion_list_ptr)
446 {
447 const char *excluder_ptr;
448 const char *event_ptr;
449 const char *next_excluder;
450 int excluder_length;
451 int exclusion_count = 0;
452 char **exclusion_list = NULL;
453 int ret = CMD_SUCCESS;
454
455 if (event_name[strlen(event_name) - 1] != '*') {
456 ERR("Event %s: Excluders can only be used with wildcarded events", event_name);
457 goto error;
458 }
459
460 next_excluder = exclusions;
461 while (*next_excluder != 0) {
462 event_ptr = event_name;
463 excluder_ptr = next_excluder;
464 excluder_length = strcspn(next_excluder, ",");
465
466 /* Scan both the excluder and the event letter by letter */
467 while (1) {
468 char e, x;
469
470 e = *event_ptr;
471 x = *excluder_ptr;
472
473 if (x == '*') {
474 /* Event is a subset of the excluder */
475 ERR("Event %s: %.*s excludes all events from %s",
476 event_name,
477 excluder_length,
478 next_excluder,
479 event_name);
480 goto error;
481 }
482 if (e == '*') {
483 /* Excluder is a proper subset of event */
484 exclusion_count++;
485 exclusion_list = realloc(exclusion_list, sizeof(char **) * exclusion_count);
486 exclusion_list[exclusion_count - 1] = strndup(next_excluder, excluder_length);
487
488 break;
489 }
490 if (x != e) {
491 /* Excluder and event sets have no common elements */
492 WARN("Event %s: %.*s does not exclude any events from %s",
493 event_name,
494 excluder_length,
495 next_excluder,
496 event_name);
497 break;
498 }
499 excluder_ptr++;
500 event_ptr++;
501 }
502 /* next excluder */
503 next_excluder += excluder_length;
504 if (*next_excluder == ',') {
505 next_excluder++;
506 }
507 }
508 goto end;
509 error:
510 while (exclusion_count--) {
511 free(exclusion_list[exclusion_count]);
512 }
513 if (exclusion_list != NULL) {
514 free(exclusion_list);
515 }
516 exclusion_list = NULL;
517 exclusion_count = 0;
518 ret = CMD_ERROR;
519 end:
520 *exclusion_count_ptr = exclusion_count;
521 *exclusion_list_ptr = exclusion_list;
522 return ret;
523 }
524 /*
525 * Enabling event using the lttng API.
526 */
527 static int enable_events(char *session_name)
528 {
529 int ret = CMD_SUCCESS, warn = 0;
530 char *event_name, *channel_name = NULL;
531 struct lttng_event ev;
532 struct lttng_domain dom;
533 int exclusion_count = 0;
534 char **exclusion_list = NULL;
535
536 memset(&ev, 0, sizeof(ev));
537 memset(&dom, 0, sizeof(dom));
538
539 if (opt_kernel) {
540 if (opt_filter) {
541 ERR("Filter not implement for kernel tracing yet");
542 ret = CMD_ERROR;
543 goto error;
544 }
545 if (opt_loglevel) {
546 WARN("Kernel loglevels are not supported.");
547 }
548 }
549
550 /* Create lttng domain */
551 if (opt_kernel) {
552 dom.type = LTTNG_DOMAIN_KERNEL;
553 dom.buf_type = LTTNG_BUFFER_GLOBAL;
554 } else if (opt_userspace) {
555 dom.type = LTTNG_DOMAIN_UST;
556 /* Default. */
557 dom.buf_type = LTTNG_BUFFER_PER_UID;
558 } else if (opt_jul) {
559 dom.type = LTTNG_DOMAIN_JUL;
560 /* Default. */
561 dom.buf_type = LTTNG_BUFFER_PER_UID;
562 } else {
563 print_missing_domain();
564 ret = CMD_ERROR;
565 goto error;
566 }
567
568 if (opt_kernel && opt_exclude) {
569 ERR("Event name exclusions are not yet implemented for kernel events");
570 ret = CMD_ERROR;
571 goto error;
572 }
573
574 channel_name = opt_channel_name;
575
576 handle = lttng_create_handle(session_name, &dom);
577 if (handle == NULL) {
578 ret = -1;
579 goto error;
580 }
581
582 if (opt_enable_all) {
583 /* Default setup for enable all */
584 if (opt_kernel) {
585 ev.type = opt_event_type;
586 ev.name[0] = '\0';
587 /* kernel loglevels not implemented */
588 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
589 } else {
590 ev.type = LTTNG_EVENT_TRACEPOINT;
591 strcpy(ev.name, "*");
592 ev.loglevel_type = opt_loglevel_type;
593 if (opt_loglevel) {
594 assert(opt_userspace || opt_jul);
595 if (opt_userspace) {
596 ev.loglevel = loglevel_str_to_value(opt_loglevel);
597 } else if (opt_jul) {
598 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
599 }
600 if (ev.loglevel == -1) {
601 ERR("Unknown loglevel %s", opt_loglevel);
602 ret = -LTTNG_ERR_INVALID;
603 goto error;
604 }
605 } else {
606 assert(opt_userspace || opt_jul);
607 if (opt_userspace) {
608 ev.loglevel = -1;
609 } else if (opt_jul) {
610 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
611 }
612 }
613 }
614
615 if (opt_exclude) {
616 ret = check_exclusion_subsets("*", opt_exclude,
617 &exclusion_count, &exclusion_list);
618 if (ret == CMD_ERROR) {
619 goto error;
620 }
621 }
622 if (!opt_filter) {
623 ret = lttng_enable_event_with_exclusions(handle,
624 &ev, channel_name,
625 NULL,
626 exclusion_count, exclusion_list);
627 if (ret < 0) {
628 switch (-ret) {
629 case LTTNG_ERR_KERN_EVENT_EXIST:
630 WARN("Kernel events already enabled (channel %s, session %s)",
631 print_channel_name(channel_name), session_name);
632 break;
633 case LTTNG_ERR_TRACE_ALREADY_STARTED:
634 {
635 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
636 ERR("Events: %s (channel %s, session %s)",
637 msg,
638 print_channel_name(channel_name),
639 session_name);
640 ret = CMD_ERROR;
641 break;
642 }
643 default:
644 ERR("Events: %s (channel %s, session %s)",
645 lttng_strerror(ret),
646 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
647 ? print_raw_channel_name(channel_name)
648 : print_channel_name(channel_name),
649 session_name);
650 break;
651 }
652 goto end;
653 }
654
655 switch (opt_event_type) {
656 case LTTNG_EVENT_TRACEPOINT:
657 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
658 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
659 MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
660 get_domain_str(dom.type),
661 exclusion_string,
662 print_channel_name(channel_name),
663 opt_loglevel);
664 free(exclusion_string);
665 } else {
666 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
667 MSG("All %s tracepoints%s are enabled in channel %s",
668 get_domain_str(dom.type),
669 exclusion_string,
670 print_channel_name(channel_name));
671 free(exclusion_string);
672 }
673 break;
674 case LTTNG_EVENT_SYSCALL:
675 if (opt_kernel) {
676 MSG("All kernel system calls are enabled in channel %s",
677 print_channel_name(channel_name));
678 }
679 break;
680 case LTTNG_EVENT_ALL:
681 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
682 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
683 MSG("All %s events%s are enabled in channel %s for loglevel %s",
684 get_domain_str(dom.type),
685 exclusion_string,
686 print_channel_name(channel_name),
687 opt_loglevel);
688 free(exclusion_string);
689 } else {
690 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
691 MSG("All %s events%s are enabled in channel %s",
692 get_domain_str(dom.type),
693 exclusion_string,
694 print_channel_name(channel_name));
695 free(exclusion_string);
696 }
697 break;
698 default:
699 /*
700 * We should not be here since lttng_enable_event should have
701 * failed on the event type.
702 */
703 goto error;
704 }
705 }
706 if (opt_filter) {
707 ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
708 opt_filter, exclusion_count, exclusion_list);
709 if (ret < 0) {
710 switch (-ret) {
711 case LTTNG_ERR_FILTER_EXIST:
712 WARN("Filter on all events is already enabled"
713 " (channel %s, session %s)",
714 print_channel_name(channel_name), session_name);
715 break;
716 case LTTNG_ERR_TRACE_ALREADY_STARTED:
717 {
718 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
719 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
720 msg,
721 print_channel_name(channel_name),
722 session_name, opt_filter);
723 ret = CMD_ERROR;
724 break;
725 }
726 default:
727 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
728 lttng_strerror(ret),
729 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
730 ? print_raw_channel_name(channel_name)
731 : print_channel_name(channel_name),
732 session_name, opt_filter);
733 break;
734 }
735 goto error;
736 } else {
737 MSG("Filter '%s' successfully set", opt_filter);
738 }
739 }
740 goto end;
741 }
742
743 /* Strip event list */
744 event_name = strtok(opt_event_list, ",");
745 while (event_name != NULL) {
746 /* Copy name and type of the event */
747 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
748 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
749 ev.type = opt_event_type;
750
751 /* Kernel tracer action */
752 if (opt_kernel) {
753 DBG("Enabling kernel event %s for channel %s",
754 event_name,
755 print_channel_name(channel_name));
756
757 switch (opt_event_type) {
758 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
759 ev.type = LTTNG_EVENT_TRACEPOINT;
760 /* Fall-through */
761 case LTTNG_EVENT_TRACEPOINT:
762 break;
763 case LTTNG_EVENT_PROBE:
764 ret = parse_probe_opts(&ev, opt_probe);
765 if (ret) {
766 ERR("Unable to parse probe options");
767 ret = 0;
768 goto error;
769 }
770 break;
771 case LTTNG_EVENT_FUNCTION:
772 ret = parse_probe_opts(&ev, opt_function);
773 if (ret) {
774 ERR("Unable to parse function probe options");
775 ret = 0;
776 goto error;
777 }
778 break;
779 case LTTNG_EVENT_FUNCTION_ENTRY:
780 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
781 LTTNG_SYMBOL_NAME_LEN);
782 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
783 break;
784 case LTTNG_EVENT_SYSCALL:
785 MSG("per-syscall selection not supported yet. Use \"-a\" "
786 "for all syscalls.");
787 default:
788 ret = CMD_UNDEFINED;
789 goto error;
790 }
791
792 /* kernel loglevels not implemented */
793 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
794 } else if (opt_userspace) { /* User-space tracer action */
795 #if 0
796 if (opt_cmd_name != NULL || opt_pid) {
797 MSG("Only supporting tracing all UST processes (-u) for now.");
798 ret = CMD_UNDEFINED;
799 goto error;
800 }
801 #endif
802
803 DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
804 print_channel_name(channel_name), opt_loglevel ? : "<all>");
805
806 switch (opt_event_type) {
807 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
808 /* Fall-through */
809 case LTTNG_EVENT_TRACEPOINT:
810 /* Copy name and type of the event */
811 ev.type = LTTNG_EVENT_TRACEPOINT;
812 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
813 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
814 break;
815 case LTTNG_EVENT_PROBE:
816 case LTTNG_EVENT_FUNCTION:
817 case LTTNG_EVENT_FUNCTION_ENTRY:
818 case LTTNG_EVENT_SYSCALL:
819 default:
820 ERR("Event type not available for user-space tracing");
821 ret = CMD_UNSUPPORTED;
822 goto error;
823 }
824
825 if (opt_exclude) {
826 if (opt_event_type != LTTNG_EVENT_ALL && opt_event_type != LTTNG_EVENT_TRACEPOINT) {
827 ERR("Exclusion option can only be used with tracepoint events");
828 ret = CMD_ERROR;
829 goto error;
830 }
831 /* Free previously allocated items */
832 if (exclusion_list != NULL) {
833 while (exclusion_count--) {
834 free(exclusion_list[exclusion_count]);
835 }
836 free(exclusion_list);
837 exclusion_list = NULL;
838 }
839 /* Check for proper subsets */
840 ret = check_exclusion_subsets(event_name, opt_exclude,
841 &exclusion_count, &exclusion_list);
842 if (ret == CMD_ERROR) {
843 goto error;
844 }
845 }
846
847 ev.loglevel_type = opt_loglevel_type;
848 if (opt_loglevel) {
849 ev.loglevel = loglevel_str_to_value(opt_loglevel);
850 if (ev.loglevel == -1) {
851 ERR("Unknown loglevel %s", opt_loglevel);
852 ret = -LTTNG_ERR_INVALID;
853 goto error;
854 }
855 } else {
856 ev.loglevel = -1;
857 }
858 } else if (opt_jul) {
859 if (opt_event_type != LTTNG_EVENT_ALL &&
860 opt_event_type != LTTNG_EVENT_TRACEPOINT) {
861 ERR("Event type not supported for JUL domain.");
862 ret = CMD_UNSUPPORTED;
863 goto error;
864 }
865
866 ev.loglevel_type = opt_loglevel_type;
867 if (opt_loglevel) {
868 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
869 if (ev.loglevel == -1) {
870 ERR("Unknown loglevel %s", opt_loglevel);
871 ret = -LTTNG_ERR_INVALID;
872 goto error;
873 }
874 } else {
875 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
876 }
877 ev.type = LTTNG_EVENT_TRACEPOINT;
878 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
879 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
880 } else {
881 print_missing_domain();
882 ret = CMD_ERROR;
883 goto error;
884 }
885
886 if (!opt_filter) {
887 char *exclusion_string;
888
889 ret = lttng_enable_event_with_exclusions(handle,
890 &ev, channel_name,
891 NULL, exclusion_count, exclusion_list);
892 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
893 if (ret < 0) {
894 /* Turn ret to positive value to handle the positive error code */
895 switch (-ret) {
896 case LTTNG_ERR_KERN_EVENT_EXIST:
897 WARN("Kernel event %s%s already enabled (channel %s, session %s)",
898 event_name,
899 exclusion_string,
900 print_channel_name(channel_name), session_name);
901 warn = 1;
902 break;
903 case LTTNG_ERR_TRACE_ALREADY_STARTED:
904 {
905 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
906 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
907 exclusion_string,
908 msg,
909 print_channel_name(channel_name),
910 session_name);
911 ret = CMD_ERROR;
912 break;
913 }
914 default:
915 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
916 exclusion_string,
917 lttng_strerror(ret),
918 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
919 ? print_raw_channel_name(channel_name)
920 : print_channel_name(channel_name),
921 session_name);
922 warn = 1;
923 break;
924 }
925 } else {
926 MSG("%s event %s%s created in channel %s",
927 get_domain_str(dom.type), event_name,
928 exclusion_string,
929 print_channel_name(channel_name));
930 }
931 free(exclusion_string);
932 }
933
934 if (opt_filter) {
935 char *exclusion_string;
936
937 ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
938 opt_filter, exclusion_count, exclusion_list);
939 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
940
941 if (ret < 0) {
942 switch (-ret) {
943 case LTTNG_ERR_FILTER_EXIST:
944 WARN("Filter on event %s%s is already enabled"
945 " (channel %s, session %s)",
946 event_name,
947 exclusion_string,
948 print_channel_name(channel_name), session_name);
949 break;
950 case LTTNG_ERR_TRACE_ALREADY_STARTED:
951 {
952 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
953 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
954 exclusion_string,
955 msg,
956 print_channel_name(channel_name),
957 session_name, opt_filter);
958 ret = CMD_ERROR;
959 break;
960 }
961 default:
962 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
963 exclusion_string,
964 lttng_strerror(ret),
965 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
966 ? print_raw_channel_name(channel_name)
967 : print_channel_name(channel_name),
968 session_name, opt_filter);
969 break;
970 }
971 free(exclusion_string);
972 goto error;
973 } else {
974 MSG("Event %s%s: Filter '%s' successfully set",
975 event_name, exclusion_string,
976 opt_filter);
977 }
978 free(exclusion_string);
979 }
980
981 /* Next event */
982 event_name = strtok(NULL, ",");
983 }
984
985 end:
986 error:
987 if (warn) {
988 ret = CMD_WARNING;
989 }
990 lttng_destroy_handle(handle);
991
992 if (exclusion_list != NULL) {
993 while (exclusion_count--) {
994 free(exclusion_list[exclusion_count]);
995 }
996 free(exclusion_list);
997 }
998
999 return ret;
1000 }
1001
1002 /*
1003 * Add event to trace session
1004 */
1005 int cmd_enable_events(int argc, const char **argv)
1006 {
1007 int opt, ret = CMD_SUCCESS;
1008 static poptContext pc;
1009 char *session_name = NULL;
1010 int event_type = -1;
1011
1012 pc = poptGetContext(NULL, argc, argv, long_options, 0);
1013 poptReadDefaultConfig(pc, 0);
1014
1015 /* Default event type */
1016 opt_event_type = LTTNG_EVENT_ALL;
1017
1018 while ((opt = poptGetNextOpt(pc)) != -1) {
1019 switch (opt) {
1020 case OPT_HELP:
1021 usage(stdout);
1022 goto end;
1023 case OPT_TRACEPOINT:
1024 opt_event_type = LTTNG_EVENT_TRACEPOINT;
1025 break;
1026 case OPT_PROBE:
1027 opt_event_type = LTTNG_EVENT_PROBE;
1028 break;
1029 case OPT_FUNCTION:
1030 opt_event_type = LTTNG_EVENT_FUNCTION;
1031 break;
1032 case OPT_FUNCTION_ENTRY:
1033 opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
1034 break;
1035 case OPT_SYSCALL:
1036 opt_event_type = LTTNG_EVENT_SYSCALL;
1037 break;
1038 case OPT_USERSPACE:
1039 opt_userspace = 1;
1040 break;
1041 case OPT_LOGLEVEL:
1042 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
1043 opt_loglevel = poptGetOptArg(pc);
1044 break;
1045 case OPT_LOGLEVEL_ONLY:
1046 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
1047 opt_loglevel = poptGetOptArg(pc);
1048 break;
1049 case OPT_LIST_OPTIONS:
1050 list_cmd_options(stdout, long_options);
1051 goto end;
1052 case OPT_FILTER:
1053 break;
1054 case OPT_EXCLUDE:
1055 break;
1056 default:
1057 usage(stderr);
1058 ret = CMD_UNDEFINED;
1059 goto end;
1060 }
1061
1062 /* Validate event type. Multiple event type are not supported. */
1063 if (event_type == -1) {
1064 event_type = opt_event_type;
1065 } else {
1066 if (event_type != opt_event_type) {
1067 ERR("Multiple event type not supported.");
1068 ret = CMD_ERROR;
1069 goto end;
1070 }
1071 }
1072 }
1073
1074 opt_event_list = (char*) poptGetArg(pc);
1075 if (opt_event_list == NULL && opt_enable_all == 0) {
1076 ERR("Missing event name(s).\n");
1077 usage(stderr);
1078 ret = CMD_ERROR;
1079 goto end;
1080 }
1081
1082 if (!opt_session_name) {
1083 session_name = get_session_name();
1084 if (session_name == NULL) {
1085 ret = CMD_ERROR;
1086 goto end;
1087 }
1088 } else {
1089 session_name = opt_session_name;
1090 }
1091
1092 ret = enable_events(session_name);
1093
1094 end:
1095 if (opt_session_name == NULL) {
1096 free(session_name);
1097 }
1098
1099 poptFreeContext(pc);
1100 return ret;
1101 }
LTTng 2.0 tools and control repository
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