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[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 _LGPL_SOURCE
19 #include <assert.h>
20 #include <popt.h>
21 #include <stdio.h>
22 #include <stdlib.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 <src/common/sessiond-comm/sessiond-comm.h>
30 #include <common/compat/string.h>
31
32 /* Mi dependancy */
33 #include <common/mi-lttng.h>
34
35 #include "../command.h"
36
37 #if (LTTNG_SYMBOL_NAME_LEN == 256)
38 #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
39 #endif
40
41 static char *opt_event_list;
42 static int opt_event_type;
43 static const char *opt_loglevel;
44 static int opt_loglevel_type;
45 static int opt_kernel;
46 static char *opt_session_name;
47 static int opt_userspace;
48 static int opt_jul;
49 static int opt_log4j;
50 static int opt_python;
51 static int opt_enable_all;
52 static char *opt_probe;
53 static char *opt_function;
54 static char *opt_channel_name;
55 static char *opt_filter;
56 static char *opt_exclude;
57
58 enum {
59 OPT_HELP = 1,
60 OPT_TRACEPOINT,
61 OPT_PROBE,
62 OPT_FUNCTION,
63 OPT_SYSCALL,
64 OPT_USERSPACE,
65 OPT_LOGLEVEL,
66 OPT_LOGLEVEL_ONLY,
67 OPT_LIST_OPTIONS,
68 OPT_FILTER,
69 OPT_EXCLUDE,
70 };
71
72 static struct lttng_handle *handle;
73 static struct mi_writer *writer;
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 {"log4j", 'l', POPT_ARG_VAL, &opt_log4j, 1, 0, 0},
85 {"python", 'p', POPT_ARG_VAL, &opt_python, 1, 0, 0},
86 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
87 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
88 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
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 * Parse probe options.
100 */
101 static int parse_probe_opts(struct lttng_event *ev, char *opt)
102 {
103 int ret = CMD_SUCCESS;
104 int match;
105 char s_hex[19];
106 #define S_HEX_LEN_SCANF_IS_A_BROKEN_API "18" /* 18 is (19 - 1) (\0 is extra) */
107 char name[LTTNG_SYMBOL_NAME_LEN];
108
109 if (opt == NULL) {
110 ret = CMD_ERROR;
111 goto end;
112 }
113
114 /* Check for symbol+offset */
115 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
116 "[^'+']+%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", name, s_hex);
117 if (match == 2) {
118 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
119 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
120 DBG("probe symbol %s", ev->attr.probe.symbol_name);
121 if (*s_hex == '\0') {
122 ERR("Invalid probe offset %s", s_hex);
123 ret = CMD_ERROR;
124 goto end;
125 }
126 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
127 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
128 ev->attr.probe.addr = 0;
129 goto end;
130 }
131
132 /* Check for symbol */
133 if (isalpha(name[0])) {
134 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "s",
135 name);
136 if (match == 1) {
137 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
138 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
139 DBG("probe symbol %s", ev->attr.probe.symbol_name);
140 ev->attr.probe.offset = 0;
141 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
142 ev->attr.probe.addr = 0;
143 goto end;
144 }
145 }
146
147 /* Check for address */
148 match = sscanf(opt, "%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", s_hex);
149 if (match > 0) {
150 if (*s_hex == '\0') {
151 ERR("Invalid probe address %s", s_hex);
152 ret = CMD_ERROR;
153 goto end;
154 }
155 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
156 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
157 ev->attr.probe.offset = 0;
158 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
159 goto end;
160 }
161
162 /* No match */
163 ret = CMD_ERROR;
164
165 end:
166 return ret;
167 }
168
169 /*
170 * Maps LOG4j loglevel from string to value
171 */
172 static int loglevel_log4j_str_to_value(const char *inputstr)
173 {
174 int i = 0;
175 char str[LTTNG_SYMBOL_NAME_LEN];
176
177 if (!inputstr || strlen(inputstr) == 0) {
178 return -1;
179 }
180
181 /*
182 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
183 * added at the end of the loop so a the upper bound we avoid the overflow.
184 */
185 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
186 str[i] = toupper(inputstr[i]);
187 i++;
188 }
189 str[i] = '\0';
190
191 if (!strcmp(str, "LOG4J_OFF") || !strcmp(str, "OFF")) {
192 return LTTNG_LOGLEVEL_LOG4J_OFF;
193 } else if (!strcmp(str, "LOG4J_FATAL") || !strcmp(str, "FATAL")) {
194 return LTTNG_LOGLEVEL_LOG4J_FATAL;
195 } else if (!strcmp(str, "LOG4J_ERROR") || !strcmp(str, "ERROR")) {
196 return LTTNG_LOGLEVEL_LOG4J_ERROR;
197 } else if (!strcmp(str, "LOG4J_WARN") || !strcmp(str, "WARN")) {
198 return LTTNG_LOGLEVEL_LOG4J_WARN;
199 } else if (!strcmp(str, "LOG4J_INFO") || !strcmp(str, "INFO")) {
200 return LTTNG_LOGLEVEL_LOG4J_INFO;
201 } else if (!strcmp(str, "LOG4J_DEBUG") || !strcmp(str, "DEBUG")) {
202 return LTTNG_LOGLEVEL_LOG4J_DEBUG;
203 } else if (!strcmp(str, "LOG4J_TRACE") || !strcmp(str, "TRACE")) {
204 return LTTNG_LOGLEVEL_LOG4J_TRACE;
205 } else if (!strcmp(str, "LOG4J_ALL") || !strcmp(str, "ALL")) {
206 return LTTNG_LOGLEVEL_LOG4J_ALL;
207 } else {
208 return -1;
209 }
210 }
211
212 /*
213 * Maps JUL loglevel from string to value
214 */
215 static int loglevel_jul_str_to_value(const char *inputstr)
216 {
217 int i = 0;
218 char str[LTTNG_SYMBOL_NAME_LEN];
219
220 if (!inputstr || strlen(inputstr) == 0) {
221 return -1;
222 }
223
224 /*
225 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
226 * added at the end of the loop so a the upper bound we avoid the overflow.
227 */
228 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
229 str[i] = toupper(inputstr[i]);
230 i++;
231 }
232 str[i] = '\0';
233
234 if (!strcmp(str, "JUL_OFF") || !strcmp(str, "OFF")) {
235 return LTTNG_LOGLEVEL_JUL_OFF;
236 } else if (!strcmp(str, "JUL_SEVERE") || !strcmp(str, "SEVERE")) {
237 return LTTNG_LOGLEVEL_JUL_SEVERE;
238 } else if (!strcmp(str, "JUL_WARNING") || !strcmp(str, "WARNING")) {
239 return LTTNG_LOGLEVEL_JUL_WARNING;
240 } else if (!strcmp(str, "JUL_INFO") || !strcmp(str, "INFO")) {
241 return LTTNG_LOGLEVEL_JUL_INFO;
242 } else if (!strcmp(str, "JUL_CONFIG") || !strcmp(str, "CONFIG")) {
243 return LTTNG_LOGLEVEL_JUL_CONFIG;
244 } else if (!strcmp(str, "JUL_FINE") || !strcmp(str, "FINE")) {
245 return LTTNG_LOGLEVEL_JUL_FINE;
246 } else if (!strcmp(str, "JUL_FINER") || !strcmp(str, "FINER")) {
247 return LTTNG_LOGLEVEL_JUL_FINER;
248 } else if (!strcmp(str, "JUL_FINEST") || !strcmp(str, "FINEST")) {
249 return LTTNG_LOGLEVEL_JUL_FINEST;
250 } else if (!strcmp(str, "JUL_ALL") || !strcmp(str, "ALL")) {
251 return LTTNG_LOGLEVEL_JUL_ALL;
252 } else {
253 return -1;
254 }
255 }
256
257 /*
258 * Maps Python loglevel from string to value
259 */
260 static int loglevel_python_str_to_value(const char *inputstr)
261 {
262 int i = 0;
263 char str[LTTNG_SYMBOL_NAME_LEN];
264
265 if (!inputstr || strlen(inputstr) == 0) {
266 return -1;
267 }
268
269 /*
270 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
271 * added at the end of the loop so a the upper bound we avoid the overflow.
272 */
273 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
274 str[i] = toupper(inputstr[i]);
275 i++;
276 }
277 str[i] = '\0';
278
279 if (!strcmp(str, "PYTHON_CRITICAL") || !strcmp(str, "CRITICAL")) {
280 return LTTNG_LOGLEVEL_PYTHON_CRITICAL;
281 } else if (!strcmp(str, "PYTHON_ERROR") || !strcmp(str, "ERROR")) {
282 return LTTNG_LOGLEVEL_PYTHON_ERROR;
283 } else if (!strcmp(str, "PYTHON_WARNING") || !strcmp(str, "WARNING")) {
284 return LTTNG_LOGLEVEL_PYTHON_WARNING;
285 } else if (!strcmp(str, "PYTHON_INFO") || !strcmp(str, "INFO")) {
286 return LTTNG_LOGLEVEL_PYTHON_INFO;
287 } else if (!strcmp(str, "PYTNON_DEBUG") || !strcmp(str, "DEBUG")) {
288 return LTTNG_LOGLEVEL_PYTHON_DEBUG;
289 } else if (!strcmp(str, "PYTHON_NOTSET") || !strcmp(str, "NOTSET")) {
290 return LTTNG_LOGLEVEL_PYTHON_NOTSET;
291 } else {
292 return -1;
293 }
294 }
295
296 /*
297 * Maps loglevel from string to value
298 */
299 static
300 int loglevel_str_to_value(const char *inputstr)
301 {
302 int i = 0;
303 char str[LTTNG_SYMBOL_NAME_LEN];
304
305 if (!inputstr || strlen(inputstr) == 0) {
306 return -1;
307 }
308
309 /*
310 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
311 * added at the end of the loop so a the upper bound we avoid the overflow.
312 */
313 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
314 str[i] = toupper(inputstr[i]);
315 i++;
316 }
317 str[i] = '\0';
318 if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
319 return LTTNG_LOGLEVEL_EMERG;
320 } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
321 return LTTNG_LOGLEVEL_ALERT;
322 } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
323 return LTTNG_LOGLEVEL_CRIT;
324 } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
325 return LTTNG_LOGLEVEL_ERR;
326 } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
327 return LTTNG_LOGLEVEL_WARNING;
328 } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
329 return LTTNG_LOGLEVEL_NOTICE;
330 } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
331 return LTTNG_LOGLEVEL_INFO;
332 } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
333 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
334 } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
335 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
336 } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
337 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
338 } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
339 return LTTNG_LOGLEVEL_DEBUG_MODULE;
340 } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
341 return LTTNG_LOGLEVEL_DEBUG_UNIT;
342 } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
343 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
344 } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
345 return LTTNG_LOGLEVEL_DEBUG_LINE;
346 } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
347 return LTTNG_LOGLEVEL_DEBUG;
348 } else {
349 return -1;
350 }
351 }
352
353 static
354 const char *print_channel_name(const char *name)
355 {
356 return name ? : DEFAULT_CHANNEL_NAME;
357 }
358
359 static
360 const char *print_raw_channel_name(const char *name)
361 {
362 return name ? : "<default>";
363 }
364
365 /*
366 * Mi print exlcusion list
367 */
368 static
369 int mi_print_exclusion(int count, char **names)
370 {
371 int i, ret;
372
373 assert(writer);
374
375 if (count == 0) {
376 ret = 0;
377 goto end;
378 }
379 ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
380 if (ret) {
381 goto end;
382 }
383
384 for (i = 0; i < count; i++) {
385 ret = mi_lttng_writer_write_element_string(writer,
386 config_element_exclusion, names[i]);
387 if (ret) {
388 goto end;
389 }
390 }
391
392 /* Close exclusions element */
393 ret = mi_lttng_writer_close_element(writer);
394
395 end:
396 return ret;
397 }
398
399 /*
400 * Return allocated string for pretty-printing exclusion names.
401 */
402 static
403 char *print_exclusions(int count, char **names)
404 {
405 int length = 0;
406 int i;
407 const char *preamble = " excluding ";
408 char *ret;
409
410 if (count == 0) {
411 return strdup("");
412 }
413
414 /* calculate total required length */
415 for (i = 0; i < count; i++) {
416 length += strlen(names[i]) + 1;
417 }
418
419 /* add length of preamble + one for NUL - one for last (missing) comma */
420 length += strlen(preamble);
421 ret = zmalloc(length);
422 if (!ret) {
423 return NULL;
424 }
425 strncpy(ret, preamble, length);
426 for (i = 0; i < count; i++) {
427 strcat(ret, names[i]);
428 if (i != count - 1) {
429 strcat(ret, ",");
430 }
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 char *string;
484 char **new_exclusion_list;
485
486 /* Excluder is a proper subset of event */
487 string = lttng_strndup(next_excluder, excluder_length);
488 if (!string) {
489 PERROR("lttng_strndup error");
490 goto error;
491 }
492 new_exclusion_list = realloc(exclusion_list,
493 sizeof(char *) * (exclusion_count + 1));
494 if (!new_exclusion_list) {
495 PERROR("realloc");
496 free(string);
497 goto error;
498 }
499 exclusion_list = new_exclusion_list;
500 exclusion_count++;
501 exclusion_list[exclusion_count - 1] = string;
502 break;
503 }
504 if (x != e) {
505 /* Excluder and event sets have no common elements */
506 WARN("Event %s: %.*s does not exclude any events from %s",
507 event_name,
508 excluder_length,
509 next_excluder,
510 event_name);
511 break;
512 }
513 excluder_ptr++;
514 event_ptr++;
515 }
516 /* next excluder */
517 next_excluder += excluder_length;
518 if (*next_excluder == ',') {
519 next_excluder++;
520 }
521 }
522 goto end;
523 error:
524 while (exclusion_count--) {
525 free(exclusion_list[exclusion_count]);
526 }
527 if (exclusion_list != NULL) {
528 free(exclusion_list);
529 }
530 exclusion_list = NULL;
531 exclusion_count = 0;
532 ret = CMD_ERROR;
533 end:
534 *exclusion_count_ptr = exclusion_count;
535 *exclusion_list_ptr = exclusion_list;
536 return ret;
537 }
538
539 static void warn_on_truncated_exclusion_names(char **exclusion_list,
540 int exclusion_count, int *warn)
541 {
542 size_t i = 0;
543
544 for (i = 0; i < exclusion_count; ++i) {
545 const char *name = exclusion_list[i];
546 size_t len = strlen(name);
547
548 if (len >= LTTNG_SYMBOL_NAME_LEN) {
549 WARN("Event exclusion \"%s\" will be truncated",
550 name);
551 *warn = 1;
552 }
553 }
554 }
555
556 /*
557 * Enabling event using the lttng API.
558 * Note: in case of error only the last error code will be return.
559 */
560 static int enable_events(char *session_name)
561 {
562 int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS;
563 int error_holder = CMD_SUCCESS, warn = 0, error = 0, success = 1;
564 char *event_name, *channel_name = NULL;
565 struct lttng_event ev;
566 struct lttng_domain dom;
567 int exclusion_count = 0;
568 char **exclusion_list = NULL;
569
570 memset(&ev, 0, sizeof(ev));
571 memset(&dom, 0, sizeof(dom));
572
573 if (opt_kernel) {
574 if (opt_loglevel) {
575 WARN("Kernel loglevels are not supported.");
576 }
577 }
578
579 /* Create lttng domain */
580 if (opt_kernel) {
581 dom.type = LTTNG_DOMAIN_KERNEL;
582 dom.buf_type = LTTNG_BUFFER_GLOBAL;
583 } else if (opt_userspace) {
584 dom.type = LTTNG_DOMAIN_UST;
585 /* Default. */
586 dom.buf_type = LTTNG_BUFFER_PER_UID;
587 } else if (opt_jul) {
588 dom.type = LTTNG_DOMAIN_JUL;
589 /* Default. */
590 dom.buf_type = LTTNG_BUFFER_PER_UID;
591 } else if (opt_log4j) {
592 dom.type = LTTNG_DOMAIN_LOG4J;
593 /* Default. */
594 dom.buf_type = LTTNG_BUFFER_PER_UID;
595 } else if (opt_python) {
596 dom.type = LTTNG_DOMAIN_PYTHON;
597 /* Default. */
598 dom.buf_type = LTTNG_BUFFER_PER_UID;
599 } else {
600 /* Checked by the caller. */
601 assert(0);
602 }
603
604 if (opt_exclude) {
605 switch (dom.type) {
606 case LTTNG_DOMAIN_KERNEL:
607 case LTTNG_DOMAIN_JUL:
608 case LTTNG_DOMAIN_LOG4J:
609 case LTTNG_DOMAIN_PYTHON:
610 ERR("Event name exclusions are not yet implemented for %s events",
611 get_domain_str(dom.type));
612 ret = CMD_ERROR;
613 goto error;
614 case LTTNG_DOMAIN_UST:
615 /* Exclusions supported */
616 break;
617 default:
618 assert(0);
619 }
620 }
621
622 channel_name = opt_channel_name;
623
624 handle = lttng_create_handle(session_name, &dom);
625 if (handle == NULL) {
626 ret = -1;
627 goto error;
628 }
629
630 /* Prepare Mi */
631 if (lttng_opt_mi) {
632 /* Open a events element */
633 ret = mi_lttng_writer_open_element(writer, config_element_events);
634 if (ret) {
635 ret = CMD_ERROR;
636 goto error;
637 }
638 }
639
640 if (opt_enable_all) {
641 /* Default setup for enable all */
642 if (opt_kernel) {
643 ev.type = opt_event_type;
644 strcpy(ev.name, "*");
645 /* kernel loglevels not implemented */
646 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
647 } else {
648 ev.type = LTTNG_EVENT_TRACEPOINT;
649 strcpy(ev.name, "*");
650 ev.loglevel_type = opt_loglevel_type;
651 if (opt_loglevel) {
652 assert(opt_userspace || opt_jul || opt_log4j || opt_python);
653 if (opt_userspace) {
654 ev.loglevel = loglevel_str_to_value(opt_loglevel);
655 } else if (opt_jul) {
656 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
657 } else if (opt_log4j) {
658 ev.loglevel = loglevel_log4j_str_to_value(opt_loglevel);
659 } else if (opt_python) {
660 ev.loglevel = loglevel_python_str_to_value(opt_loglevel);
661 }
662 if (ev.loglevel == -1) {
663 ERR("Unknown loglevel %s", opt_loglevel);
664 ret = -LTTNG_ERR_INVALID;
665 goto error;
666 }
667 } else {
668 assert(opt_userspace || opt_jul || opt_log4j || opt_python);
669 if (opt_userspace) {
670 ev.loglevel = -1;
671 } else if (opt_jul) {
672 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
673 } else if (opt_log4j) {
674 ev.loglevel = LTTNG_LOGLEVEL_LOG4J_ALL;
675 } else if (opt_python) {
676 ev.loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG;
677 }
678 }
679 }
680
681 if (opt_exclude) {
682 ret = check_exclusion_subsets("*", opt_exclude,
683 &exclusion_count, &exclusion_list);
684 if (ret == CMD_ERROR) {
685 goto error;
686 }
687 ev.exclusion = 1;
688
689 warn_on_truncated_exclusion_names(exclusion_list,
690 exclusion_count, &warn);
691 }
692 if (!opt_filter) {
693 ret = lttng_enable_event_with_exclusions(handle,
694 &ev, channel_name,
695 NULL,
696 exclusion_count, exclusion_list);
697 if (ret < 0) {
698 switch (-ret) {
699 case LTTNG_ERR_KERN_EVENT_EXIST:
700 WARN("Kernel events already enabled (channel %s, session %s)",
701 print_channel_name(channel_name), session_name);
702 warn = 1;
703 break;
704 case LTTNG_ERR_TRACE_ALREADY_STARTED:
705 {
706 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
707 ERR("Events: %s (channel %s, session %s)",
708 msg,
709 print_channel_name(channel_name),
710 session_name);
711 error = 1;
712 break;
713 }
714 default:
715 ERR("Events: %s (channel %s, session %s)",
716 lttng_strerror(ret),
717 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
718 ? print_raw_channel_name(channel_name)
719 : print_channel_name(channel_name),
720 session_name);
721 error = 1;
722 break;
723 }
724 goto end;
725 }
726
727 switch (opt_event_type) {
728 case LTTNG_EVENT_TRACEPOINT:
729 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
730 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
731
732 if (!exclusion_string) {
733 PERROR("Cannot allocate exclusion_string");
734 error = 1;
735 goto end;
736 }
737 MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
738 get_domain_str(dom.type),
739 exclusion_string,
740 print_channel_name(channel_name),
741 opt_loglevel);
742 free(exclusion_string);
743 } else {
744 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
745
746 if (!exclusion_string) {
747 PERROR("Cannot allocate exclusion_string");
748 error = 1;
749 goto end;
750 }
751 MSG("All %s tracepoints%s are enabled in channel %s",
752 get_domain_str(dom.type),
753 exclusion_string,
754 print_channel_name(channel_name));
755 free(exclusion_string);
756 }
757 break;
758 case LTTNG_EVENT_SYSCALL:
759 if (opt_kernel) {
760 MSG("All %s system calls are enabled in channel %s",
761 get_domain_str(dom.type),
762 print_channel_name(channel_name));
763 }
764 break;
765 case LTTNG_EVENT_ALL:
766 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
767 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
768
769 if (!exclusion_string) {
770 PERROR("Cannot allocate exclusion_string");
771 error = 1;
772 goto end;
773 }
774 MSG("All %s events%s are enabled in channel %s for loglevel %s",
775 get_domain_str(dom.type),
776 exclusion_string,
777 print_channel_name(channel_name),
778 opt_loglevel);
779 free(exclusion_string);
780 } else {
781 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
782
783 if (!exclusion_string) {
784 PERROR("Cannot allocate exclusion_string");
785 error = 1;
786 goto end;
787 }
788 MSG("All %s events%s are enabled in channel %s",
789 get_domain_str(dom.type),
790 exclusion_string,
791 print_channel_name(channel_name));
792 free(exclusion_string);
793 }
794 break;
795 default:
796 /*
797 * We should not be here since lttng_enable_event should have
798 * failed on the event type.
799 */
800 goto error;
801 }
802 }
803
804 if (opt_filter) {
805 command_ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
806 opt_filter, exclusion_count, exclusion_list);
807 if (command_ret < 0) {
808 switch (-command_ret) {
809 case LTTNG_ERR_FILTER_EXIST:
810 WARN("Filter on all events is already enabled"
811 " (channel %s, session %s)",
812 print_channel_name(channel_name), session_name);
813 warn = 1;
814 break;
815 case LTTNG_ERR_TRACE_ALREADY_STARTED:
816 {
817 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
818 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
819 msg,
820 print_channel_name(channel_name),
821 session_name, opt_filter);
822 error = 1;
823 break;
824 }
825 default:
826 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
827 lttng_strerror(command_ret),
828 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
829 ? print_raw_channel_name(channel_name)
830 : print_channel_name(channel_name),
831 session_name, opt_filter);
832 error = 1;
833 break;
834 }
835 error_holder = command_ret;
836 } else {
837 ev.filter = 1;
838 MSG("Filter '%s' successfully set", opt_filter);
839 }
840 }
841
842 if (lttng_opt_mi) {
843 /* The wildcard * is used for kernel and ust domain to
844 * represent ALL. We copy * in event name to force the wildcard use
845 * for kernel domain
846 *
847 * Note: this is strictly for semantic and printing while in
848 * machine interface mode.
849 */
850 strcpy(ev.name, "*");
851
852 /* If we reach here the events are enabled */
853 if (!error && !warn) {
854 ev.enabled = 1;
855 } else {
856 ev.enabled = 0;
857 success = 0;
858 }
859 ret = mi_lttng_event(writer, &ev, 1, handle->domain.type);
860 if (ret) {
861 ret = CMD_ERROR;
862 goto error;
863 }
864
865 /* print exclusion */
866 ret = mi_print_exclusion(exclusion_count, exclusion_list);
867 if (ret) {
868 ret = CMD_ERROR;
869 goto error;
870 }
871
872 /* Success ? */
873 ret = mi_lttng_writer_write_element_bool(writer,
874 mi_lttng_element_command_success, success);
875 if (ret) {
876 ret = CMD_ERROR;
877 goto error;
878 }
879
880 /* Close event element */
881 ret = mi_lttng_writer_close_element(writer);
882 if (ret) {
883 ret = CMD_ERROR;
884 goto error;
885 }
886 }
887
888 goto end;
889 }
890
891 /* Strip event list */
892 event_name = strtok(opt_event_list, ",");
893 while (event_name != NULL) {
894 /* Copy name and type of the event */
895 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
896 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
897 ev.type = opt_event_type;
898
899 /* Kernel tracer action */
900 if (opt_kernel) {
901 DBG("Enabling kernel event %s for channel %s",
902 event_name,
903 print_channel_name(channel_name));
904
905 switch (opt_event_type) {
906 case LTTNG_EVENT_ALL: /* Enable tracepoints and syscalls */
907 /* If event name differs from *, select tracepoint. */
908 if (strcmp(ev.name, "*")) {
909 ev.type = LTTNG_EVENT_TRACEPOINT;
910 }
911 break;
912 case LTTNG_EVENT_TRACEPOINT:
913 break;
914 case LTTNG_EVENT_PROBE:
915 ret = parse_probe_opts(&ev, opt_probe);
916 if (ret) {
917 ERR("Unable to parse probe options");
918 ret = 0;
919 goto error;
920 }
921 break;
922 case LTTNG_EVENT_FUNCTION:
923 ret = parse_probe_opts(&ev, opt_function);
924 if (ret) {
925 ERR("Unable to parse function probe options");
926 ret = 0;
927 goto error;
928 }
929 break;
930 case LTTNG_EVENT_SYSCALL:
931 ev.type = LTTNG_EVENT_SYSCALL;
932 break;
933 default:
934 ret = CMD_UNDEFINED;
935 goto error;
936 }
937
938 /* kernel loglevels not implemented */
939 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
940 } else if (opt_userspace) { /* User-space tracer action */
941 DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
942 print_channel_name(channel_name), opt_loglevel ? : "<all>");
943
944 switch (opt_event_type) {
945 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
946 /* Fall-through */
947 case LTTNG_EVENT_TRACEPOINT:
948 /* Copy name and type of the event */
949 ev.type = LTTNG_EVENT_TRACEPOINT;
950 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
951 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
952 break;
953 case LTTNG_EVENT_PROBE:
954 case LTTNG_EVENT_FUNCTION:
955 case LTTNG_EVENT_SYSCALL:
956 default:
957 ERR("Event type not available for user-space tracing");
958 ret = CMD_UNSUPPORTED;
959 goto error;
960 }
961
962 if (opt_exclude) {
963 ev.exclusion = 1;
964 if (opt_event_type != LTTNG_EVENT_ALL && opt_event_type != LTTNG_EVENT_TRACEPOINT) {
965 ERR("Exclusion option can only be used with tracepoint events");
966 ret = CMD_ERROR;
967 goto error;
968 }
969 /* Free previously allocated items */
970 if (exclusion_list != NULL) {
971 while (exclusion_count--) {
972 free(exclusion_list[exclusion_count]);
973 }
974 free(exclusion_list);
975 exclusion_list = NULL;
976 }
977 /* Check for proper subsets */
978 ret = check_exclusion_subsets(event_name, opt_exclude,
979 &exclusion_count, &exclusion_list);
980 if (ret == CMD_ERROR) {
981 goto error;
982 }
983
984 warn_on_truncated_exclusion_names(
985 exclusion_list, exclusion_count, &warn);
986 }
987
988 ev.loglevel_type = opt_loglevel_type;
989 if (opt_loglevel) {
990 ev.loglevel = loglevel_str_to_value(opt_loglevel);
991 if (ev.loglevel == -1) {
992 ERR("Unknown loglevel %s", opt_loglevel);
993 ret = -LTTNG_ERR_INVALID;
994 goto error;
995 }
996 } else {
997 ev.loglevel = -1;
998 }
999 } else if (opt_jul || opt_log4j || opt_python) {
1000 if (opt_event_type != LTTNG_EVENT_ALL &&
1001 opt_event_type != LTTNG_EVENT_TRACEPOINT) {
1002 ERR("Event type not supported for domain.");
1003 ret = CMD_UNSUPPORTED;
1004 goto error;
1005 }
1006
1007 ev.loglevel_type = opt_loglevel_type;
1008 if (opt_loglevel) {
1009 if (opt_jul) {
1010 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
1011 } else if (opt_log4j) {
1012 ev.loglevel = loglevel_log4j_str_to_value(opt_loglevel);
1013 } else if (opt_python) {
1014 ev.loglevel = loglevel_python_str_to_value(opt_loglevel);
1015 }
1016 if (ev.loglevel == -1) {
1017 ERR("Unknown loglevel %s", opt_loglevel);
1018 ret = -LTTNG_ERR_INVALID;
1019 goto error;
1020 }
1021 } else {
1022 if (opt_jul) {
1023 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1024 } else if (opt_log4j) {
1025 ev.loglevel = LTTNG_LOGLEVEL_LOG4J_ALL;
1026 } else if (opt_python) {
1027 ev.loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG;
1028 }
1029 }
1030 ev.type = LTTNG_EVENT_TRACEPOINT;
1031 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
1032 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1033 } else {
1034 assert(0);
1035 }
1036
1037 if (!opt_filter) {
1038 char *exclusion_string;
1039
1040 command_ret = lttng_enable_event_with_exclusions(handle,
1041 &ev, channel_name,
1042 NULL, exclusion_count, exclusion_list);
1043 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
1044 if (!exclusion_string) {
1045 PERROR("Cannot allocate exclusion_string");
1046 error = 1;
1047 goto end;
1048 }
1049 if (command_ret < 0) {
1050 /* Turn ret to positive value to handle the positive error code */
1051 switch (-command_ret) {
1052 case LTTNG_ERR_KERN_EVENT_EXIST:
1053 WARN("Kernel event %s%s already enabled (channel %s, session %s)",
1054 event_name,
1055 exclusion_string,
1056 print_channel_name(channel_name), session_name);
1057 warn = 1;
1058 break;
1059 case LTTNG_ERR_TRACE_ALREADY_STARTED:
1060 {
1061 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
1062 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
1063 exclusion_string,
1064 msg,
1065 print_channel_name(channel_name),
1066 session_name);
1067 error = 1;
1068 break;
1069 }
1070 default:
1071 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
1072 exclusion_string,
1073 lttng_strerror(command_ret),
1074 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
1075 ? print_raw_channel_name(channel_name)
1076 : print_channel_name(channel_name),
1077 session_name);
1078 error = 1;
1079 break;
1080 }
1081 error_holder = command_ret;
1082 } else {
1083 switch (dom.type) {
1084 case LTTNG_DOMAIN_KERNEL:
1085 case LTTNG_DOMAIN_UST:
1086 MSG("%s event %s%s created in channel %s",
1087 get_domain_str(dom.type),
1088 event_name,
1089 exclusion_string,
1090 print_channel_name(channel_name));
1091 break;
1092 case LTTNG_DOMAIN_JUL:
1093 case LTTNG_DOMAIN_LOG4J:
1094 case LTTNG_DOMAIN_PYTHON:
1095 /*
1096 * Don't print the default channel
1097 * name for agent domains.
1098 */
1099 MSG("%s event %s%s enabled",
1100 get_domain_str(dom.type),
1101 event_name,
1102 exclusion_string);
1103 break;
1104 default:
1105 assert(0);
1106 }
1107 }
1108 free(exclusion_string);
1109 }
1110
1111 if (opt_filter) {
1112 char *exclusion_string;
1113
1114 /* Filter present */
1115 ev.filter = 1;
1116
1117 command_ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
1118 opt_filter, exclusion_count, exclusion_list);
1119 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
1120 if (!exclusion_string) {
1121 PERROR("Cannot allocate exclusion_string");
1122 error = 1;
1123 goto end;
1124 }
1125 if (command_ret < 0) {
1126 switch (-command_ret) {
1127 case LTTNG_ERR_FILTER_EXIST:
1128 WARN("Filter on event %s%s is already enabled"
1129 " (channel %s, session %s)",
1130 event_name,
1131 exclusion_string,
1132 print_channel_name(channel_name), session_name);
1133 warn = 1;
1134 break;
1135 case LTTNG_ERR_TRACE_ALREADY_STARTED:
1136 {
1137 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
1138 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
1139 exclusion_string,
1140 msg,
1141 print_channel_name(channel_name),
1142 session_name, opt_filter);
1143 error = 1;
1144 break;
1145 }
1146 default:
1147 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
1148 exclusion_string,
1149 lttng_strerror(command_ret),
1150 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
1151 ? print_raw_channel_name(channel_name)
1152 : print_channel_name(channel_name),
1153 session_name, opt_filter);
1154 error = 1;
1155 break;
1156 }
1157 error_holder = command_ret;
1158
1159 } else {
1160 MSG("Event %s%s: Filter '%s' successfully set",
1161 event_name, exclusion_string,
1162 opt_filter);
1163 }
1164 free(exclusion_string);
1165 }
1166
1167 if (lttng_opt_mi) {
1168 if (command_ret) {
1169 success = 0;
1170 ev.enabled = 0;
1171 } else {
1172 ev.enabled = 1;
1173 }
1174
1175 ret = mi_lttng_event(writer, &ev, 1, handle->domain.type);
1176 if (ret) {
1177 ret = CMD_ERROR;
1178 goto error;
1179 }
1180
1181 /* print exclusion */
1182 ret = mi_print_exclusion(exclusion_count, exclusion_list);
1183 if (ret) {
1184 ret = CMD_ERROR;
1185 goto error;
1186 }
1187
1188 /* Success ? */
1189 ret = mi_lttng_writer_write_element_bool(writer,
1190 mi_lttng_element_command_success, success);
1191 if (ret) {
1192 ret = CMD_ERROR;
1193 goto end;
1194 }
1195
1196 /* Close event element */
1197 ret = mi_lttng_writer_close_element(writer);
1198 if (ret) {
1199 ret = CMD_ERROR;
1200 goto end;
1201 }
1202 }
1203
1204 /* Next event */
1205 event_name = strtok(NULL, ",");
1206 /* Reset warn, error and success */
1207 success = 1;
1208 }
1209
1210 end:
1211 /* Close Mi */
1212 if (lttng_opt_mi) {
1213 /* Close events element */
1214 ret = mi_lttng_writer_close_element(writer);
1215 if (ret) {
1216 ret = CMD_ERROR;
1217 goto error;
1218 }
1219 }
1220 error:
1221 if (warn) {
1222 ret = CMD_WARNING;
1223 }
1224 if (error) {
1225 ret = CMD_ERROR;
1226 }
1227 lttng_destroy_handle(handle);
1228
1229 if (exclusion_list != NULL) {
1230 while (exclusion_count--) {
1231 free(exclusion_list[exclusion_count]);
1232 }
1233 free(exclusion_list);
1234 }
1235
1236 /* Overwrite ret with error_holder if there was an actual error with
1237 * enabling an event.
1238 */
1239 ret = error_holder ? error_holder : ret;
1240
1241 return ret;
1242 }
1243
1244 /*
1245 * Add event to trace session
1246 */
1247 int cmd_enable_events(int argc, const char **argv)
1248 {
1249 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
1250 static poptContext pc;
1251 char *session_name = NULL;
1252 int event_type = -1;
1253
1254 pc = poptGetContext(NULL, argc, argv, long_options, 0);
1255 poptReadDefaultConfig(pc, 0);
1256
1257 /* Default event type */
1258 opt_event_type = LTTNG_EVENT_ALL;
1259
1260 while ((opt = poptGetNextOpt(pc)) != -1) {
1261 switch (opt) {
1262 case OPT_HELP:
1263 SHOW_HELP();
1264 goto end;
1265 case OPT_TRACEPOINT:
1266 opt_event_type = LTTNG_EVENT_TRACEPOINT;
1267 break;
1268 case OPT_PROBE:
1269 opt_event_type = LTTNG_EVENT_PROBE;
1270 break;
1271 case OPT_FUNCTION:
1272 opt_event_type = LTTNG_EVENT_FUNCTION;
1273 break;
1274 case OPT_SYSCALL:
1275 opt_event_type = LTTNG_EVENT_SYSCALL;
1276 break;
1277 case OPT_USERSPACE:
1278 opt_userspace = 1;
1279 break;
1280 case OPT_LOGLEVEL:
1281 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
1282 opt_loglevel = poptGetOptArg(pc);
1283 break;
1284 case OPT_LOGLEVEL_ONLY:
1285 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
1286 opt_loglevel = poptGetOptArg(pc);
1287 break;
1288 case OPT_LIST_OPTIONS:
1289 list_cmd_options(stdout, long_options);
1290 goto end;
1291 case OPT_FILTER:
1292 break;
1293 case OPT_EXCLUDE:
1294 break;
1295 default:
1296 ret = CMD_UNDEFINED;
1297 goto end;
1298 }
1299
1300 /* Validate event type. Multiple event type are not supported. */
1301 if (event_type == -1) {
1302 event_type = opt_event_type;
1303 } else {
1304 if (event_type != opt_event_type) {
1305 ERR("Multiple event type not supported.");
1306 ret = CMD_ERROR;
1307 goto end;
1308 }
1309 }
1310 }
1311
1312 ret = print_missing_or_multiple_domains(
1313 opt_kernel + opt_userspace + opt_jul + opt_log4j + opt_python);
1314 if (ret) {
1315 ret = CMD_ERROR;
1316 goto end;
1317 }
1318
1319 /* Mi check */
1320 if (lttng_opt_mi) {
1321 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
1322 if (!writer) {
1323 ret = -LTTNG_ERR_NOMEM;
1324 goto end;
1325 }
1326
1327 /* Open command element */
1328 ret = mi_lttng_writer_command_open(writer,
1329 mi_lttng_element_command_enable_event);
1330 if (ret) {
1331 ret = CMD_ERROR;
1332 goto end;
1333 }
1334
1335 /* Open output element */
1336 ret = mi_lttng_writer_open_element(writer,
1337 mi_lttng_element_command_output);
1338 if (ret) {
1339 ret = CMD_ERROR;
1340 goto end;
1341 }
1342 }
1343
1344 opt_event_list = (char*) poptGetArg(pc);
1345 if (opt_event_list == NULL && opt_enable_all == 0) {
1346 ERR("Missing event name(s).\n");
1347 ret = CMD_ERROR;
1348 goto end;
1349 }
1350
1351 if (!opt_session_name) {
1352 session_name = get_session_name();
1353 if (session_name == NULL) {
1354 command_ret = CMD_ERROR;
1355 success = 0;
1356 goto mi_closing;
1357 }
1358 } else {
1359 session_name = opt_session_name;
1360 }
1361
1362 command_ret = enable_events(session_name);
1363 if (command_ret) {
1364 success = 0;
1365 goto mi_closing;
1366 }
1367
1368 mi_closing:
1369 /* Mi closing */
1370 if (lttng_opt_mi) {
1371 /* Close output element */
1372 ret = mi_lttng_writer_close_element(writer);
1373 if (ret) {
1374 ret = CMD_ERROR;
1375 goto end;
1376 }
1377
1378 ret = mi_lttng_writer_write_element_bool(writer,
1379 mi_lttng_element_command_success, success);
1380 if (ret) {
1381 ret = CMD_ERROR;
1382 goto end;
1383 }
1384
1385 /* Command element close */
1386 ret = mi_lttng_writer_command_close(writer);
1387 if (ret) {
1388 ret = CMD_ERROR;
1389 goto end;
1390 }
1391 }
1392
1393 end:
1394 /* Mi clean-up */
1395 if (writer && mi_lttng_writer_destroy(writer)) {
1396 /* Preserve original error code */
1397 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
1398 }
1399
1400 if (opt_session_name == NULL) {
1401 free(session_name);
1402 }
1403
1404 /* Overwrite ret if an error occurred in enable_events */
1405 ret = command_ret ? command_ret : ret;
1406
1407 poptFreeContext(pc);
1408 return ret;
1409 }
LTTng 2.0 tools and control repository
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