972043eeb25f672c9ec02d9f13232c4ca80d98b1
[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 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <popt.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28 #include <inttypes.h>
29 #include <ctype.h>
30
31 #include <src/common/sessiond-comm/sessiond-comm.h>
32
33 /* Mi dependancy */
34 #include <common/mi-lttng.h>
35
36 #include "../command.h"
37
38 #if (LTTNG_SYMBOL_NAME_LEN == 256)
39 #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
40 #endif
41
42 static char *opt_event_list;
43 static int opt_event_type;
44 static const char *opt_loglevel;
45 static int opt_loglevel_type;
46 static int opt_kernel;
47 static char *opt_session_name;
48 static int opt_userspace;
49 static int opt_jul;
50 static int opt_log4j;
51 static int opt_python;
52 static int opt_enable_all;
53 static char *opt_probe;
54 static char *opt_function;
55 static char *opt_channel_name;
56 static char *opt_filter;
57 static char *opt_exclude;
58
59 enum {
60 OPT_HELP = 1,
61 OPT_TRACEPOINT,
62 OPT_PROBE,
63 OPT_FUNCTION,
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 static struct mi_writer *writer;
75
76 static struct poptOption long_options[] = {
77 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
78 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
79 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
80 {"all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
81 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
82 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
83 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
84 {"jul", 'j', POPT_ARG_VAL, &opt_jul, 1, 0, 0},
85 {"log4j", 'l', POPT_ARG_VAL, &opt_log4j, 1, 0, 0},
86 {"python", 'p', POPT_ARG_VAL, &opt_python, 1, 0, 0},
87 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
88 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
89 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
90 {"syscall", 0, POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
91 {"loglevel", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
92 {"loglevel-only", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
93 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
94 {"filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
95 {"exclude", 'x', POPT_ARG_STRING, &opt_exclude, OPT_EXCLUDE, 0, 0},
96 {0, 0, 0, 0, 0, 0, 0}
97 };
98
99 /*
100 * usage
101 */
102 static void usage(FILE *ofp)
103 {
104 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] (-k | -u | -j | -l | -p) [OPTIONS] \n");
105 fprintf(ofp, "\n");
106 fprintf(ofp, "Options:\n");
107 fprintf(ofp, " -h, --help Show this help\n");
108 fprintf(ofp, " --list-options Simple listing of options\n");
109 fprintf(ofp, " -s, --session NAME Apply to session name\n");
110 fprintf(ofp, " -c, --channel NAME Apply to this channel\n");
111 fprintf(ofp, " -a, --all Enable all tracepoints and syscalls\n");
112 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
113 fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
114 fprintf(ofp, " -j, --jul Apply for Java application using JUL\n");
115 fprintf(ofp, " -l, --log4j Apply for Java application using LOG4j\n");
116 fprintf(ofp, " -p, --python Apply for Python application\n");
117 fprintf(ofp, "\n");
118 fprintf(ofp, "Event options:\n");
119 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
120 fprintf(ofp, " - userspace tracer supports wildcards at end of string.\n");
121 fprintf(ofp, " Don't forget to quote to deal with bash expansion.\n");
122 fprintf(ofp, " e.g.:\n");
123 fprintf(ofp, " \"*\"\n");
124 fprintf(ofp, " \"app_component:na*\"\n");
125 fprintf(ofp, " --probe (addr | symbol | symbol+offset)\n");
126 fprintf(ofp, " Dynamic probe.\n");
127 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
128 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
129 fprintf(ofp, " --function (addr | symbol | symbol+offset)\n");
130 fprintf(ofp, " Dynamic function entry/return probe.\n");
131 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
132 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
133 fprintf(ofp, " --syscall System call event\n");
134 fprintf(ofp, "\n");
135 fprintf(ofp, " --loglevel name\n");
136 fprintf(ofp, " Tracepoint loglevel range from 0 to loglevel.\n");
137 fprintf(ofp, " For JUL/LOG4j/Python domains, see the table below for the range values.\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, "\n");
163 fprintf(ofp, " Available JUL domain loglevels:\n");
164 fprintf(ofp, " JUL_OFF = INT32_MAX\n");
165 fprintf(ofp, " JUL_SEVERE = %d\n", LTTNG_LOGLEVEL_JUL_SEVERE);
166 fprintf(ofp, " JUL_WARNING = %d\n", LTTNG_LOGLEVEL_JUL_WARNING);
167 fprintf(ofp, " JUL_INFO = %d\n", LTTNG_LOGLEVEL_JUL_INFO);
168 fprintf(ofp, " JUL_CONFIG = %d\n", LTTNG_LOGLEVEL_JUL_CONFIG);
169 fprintf(ofp, " JUL_FINE = %d\n", LTTNG_LOGLEVEL_JUL_FINE);
170 fprintf(ofp, " JUL_FINER = %d\n", LTTNG_LOGLEVEL_JUL_FINER);
171 fprintf(ofp, " JUL_FINEST = %d\n", LTTNG_LOGLEVEL_JUL_FINEST);
172 fprintf(ofp, " JUL_ALL = INT32_MIN\n");
173 fprintf(ofp, " (shortcuts such as \"severe\" are allowed)\n");
174 fprintf(ofp, "\n");
175 fprintf(ofp, " Available LOG4j domain loglevels:\n");
176 fprintf(ofp, " LOG4J_OFF = INT32_MAX\n");
177 fprintf(ofp, " LOG4J_FATAL = %d\n", LTTNG_LOGLEVEL_LOG4J_FATAL);
178 fprintf(ofp, " LOG4J_ERROR = %d\n", LTTNG_LOGLEVEL_LOG4J_ERROR);
179 fprintf(ofp, " LOG4J_WARN = %d\n", LTTNG_LOGLEVEL_LOG4J_WARN);
180 fprintf(ofp, " LOG4J_INFO = %d\n", LTTNG_LOGLEVEL_LOG4J_INFO);
181 fprintf(ofp, " LOG4J_DEBUG = %d\n", LTTNG_LOGLEVEL_LOG4J_DEBUG);
182 fprintf(ofp, " LOG4J_TRACE = %d\n", LTTNG_LOGLEVEL_LOG4J_TRACE);
183 fprintf(ofp, " LOG4J_ALL = INT32_MIN\n");
184 fprintf(ofp, " (shortcuts such as \"severe\" are allowed)\n");
185 fprintf(ofp, "\n");
186 fprintf(ofp, " Available Python domain loglevels:\n");
187 fprintf(ofp, " PYTHON_CRITICAL = %d\n", LTTNG_LOGLEVEL_PYTHON_CRITICAL);
188 fprintf(ofp, " PYTHON_ERROR = %d\n", LTTNG_LOGLEVEL_PYTHON_ERROR);
189 fprintf(ofp, " PYTHON_WARNING = %d\n", LTTNG_LOGLEVEL_PYTHON_WARNING);
190 fprintf(ofp, " PYTHON_INFO = %d\n", LTTNG_LOGLEVEL_PYTHON_INFO);
191 fprintf(ofp, " PYTHON_DEBUG = %d\n", LTTNG_LOGLEVEL_PYTHON_DEBUG);
192 fprintf(ofp, " PYTHON_NOTSET = %d\n", LTTNG_LOGLEVEL_PYTHON_NOTSET);
193 fprintf(ofp, " (shortcuts such as \"critical\" are allowed)\n");
194 fprintf(ofp, "\n");
195 fprintf(ofp, " -f, --filter \'expression\'\n");
196 fprintf(ofp, " Filter expression on event fields and context.\n");
197 fprintf(ofp, " Event recording depends on evaluation.\n");
198 fprintf(ofp, " Only specify on first activation of\n");
199 fprintf(ofp, " a given event within a session.\n");
200 fprintf(ofp, " Filter only allowed when enabling\n");
201 fprintf(ofp, " events within a session before tracing\n");
202 fprintf(ofp, " is started. If the filter fails to link\n");
203 fprintf(ofp, " with the event within the traced domain,\n");
204 fprintf(ofp, " the event will be discarded. Currently,\n");
205 fprintf(ofp, " filter is only implemented for the user-space\n");
206 fprintf(ofp, " tracer.\n");
207 fprintf(ofp, " Expression examples:.\n");
208 fprintf(ofp, " \n");
209 fprintf(ofp, " 'intfield > 500 && intfield < 503'\n");
210 fprintf(ofp, " '(strfield == \"test\" || intfield != 10) && intfield > 33'\n");
211 fprintf(ofp, " 'doublefield > 1.1 && intfield < 5.3'\n");
212 fprintf(ofp, " \n");
213 fprintf(ofp, " Wildcards are allowed at the end of strings:\n");
214 fprintf(ofp, " 'seqfield1 == \"te*\"'\n");
215 fprintf(ofp, " In string literals, the escape character is '\\'.\n");
216 fprintf(ofp, " Use '\\*' for the '*' character, and '\\\\' for\n");
217 fprintf(ofp, " the '\\' character. Wildcard match any sequence of,\n");
218 fprintf(ofp, " characters including an empty sub-string (match 0 or\n");
219 fprintf(ofp, " more characters).\n");
220 fprintf(ofp, "\n");
221 fprintf(ofp, " Context information can be used for filtering. The\n");
222 fprintf(ofp, " examples below show usage of context filtering on\n");
223 fprintf(ofp, " process name (with a wildcard), process ID range, and\n");
224 fprintf(ofp, " unique thread ID for filtering. The process and\n");
225 fprintf(ofp, " thread ID of running applications can be found under\n");
226 fprintf(ofp, " columns \"PID\" and \"LWP\" of the \"ps -eLf\" command.\n");
227 fprintf(ofp, "\n");
228 fprintf(ofp, " '$ctx.procname == \"demo*\"'\n");
229 fprintf(ofp, " '$ctx.vpid >= 4433 && $ctx.vpid < 4455'\n");
230 fprintf(ofp, " '$ctx.vtid == 1234'\n");
231 fprintf(ofp, " -x, --exclude LIST\n");
232 fprintf(ofp, " Add exclusions to UST tracepoints:\n");
233 fprintf(ofp, " Events that match any of the items\n");
234 fprintf(ofp, " in the comma-separated LIST are not\n");
235 fprintf(ofp, " enabled, even if they match a wildcard\n");
236 fprintf(ofp, " definition of the event.\n");
237 fprintf(ofp, "\n");
238 }
239
240 /*
241 * Parse probe options.
242 */
243 static int parse_probe_opts(struct lttng_event *ev, char *opt)
244 {
245 int ret = CMD_SUCCESS;
246 int match;
247 char s_hex[19];
248 #define S_HEX_LEN_SCANF_IS_A_BROKEN_API "18" /* 18 is (19 - 1) (\0 is extra) */
249 char name[LTTNG_SYMBOL_NAME_LEN];
250
251 if (opt == NULL) {
252 ret = CMD_ERROR;
253 goto end;
254 }
255
256 /* Check for symbol+offset */
257 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
258 "[^'+']+%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", name, s_hex);
259 if (match == 2) {
260 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
261 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
262 DBG("probe symbol %s", ev->attr.probe.symbol_name);
263 if (*s_hex == '\0') {
264 ERR("Invalid probe offset %s", s_hex);
265 ret = CMD_ERROR;
266 goto end;
267 }
268 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
269 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
270 ev->attr.probe.addr = 0;
271 goto end;
272 }
273
274 /* Check for symbol */
275 if (isalpha(name[0])) {
276 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "s",
277 name);
278 if (match == 1) {
279 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
280 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
281 DBG("probe symbol %s", ev->attr.probe.symbol_name);
282 ev->attr.probe.offset = 0;
283 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
284 ev->attr.probe.addr = 0;
285 goto end;
286 }
287 }
288
289 /* Check for address */
290 match = sscanf(opt, "%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", s_hex);
291 if (match > 0) {
292 if (*s_hex == '\0') {
293 ERR("Invalid probe address %s", s_hex);
294 ret = CMD_ERROR;
295 goto end;
296 }
297 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
298 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
299 ev->attr.probe.offset = 0;
300 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
301 goto end;
302 }
303
304 /* No match */
305 ret = CMD_ERROR;
306
307 end:
308 return ret;
309 }
310
311 /*
312 * Maps LOG4j loglevel from string to value
313 */
314 static int loglevel_log4j_str_to_value(const char *inputstr)
315 {
316 int i = 0;
317 char str[LTTNG_SYMBOL_NAME_LEN];
318
319 if (!inputstr || strlen(inputstr) == 0) {
320 return -1;
321 }
322
323 /*
324 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
325 * added at the end of the loop so a the upper bound we avoid the overflow.
326 */
327 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
328 str[i] = toupper(inputstr[i]);
329 i++;
330 }
331 str[i] = '\0';
332
333 if (!strcmp(str, "LOG4J_OFF") || !strcmp(str, "OFF")) {
334 return LTTNG_LOGLEVEL_LOG4J_OFF;
335 } else if (!strcmp(str, "LOG4J_FATAL") || !strcmp(str, "FATAL")) {
336 return LTTNG_LOGLEVEL_LOG4J_FATAL;
337 } else if (!strcmp(str, "LOG4J_ERROR") || !strcmp(str, "ERROR")) {
338 return LTTNG_LOGLEVEL_LOG4J_ERROR;
339 } else if (!strcmp(str, "LOG4J_WARN") || !strcmp(str, "WARN")) {
340 return LTTNG_LOGLEVEL_LOG4J_WARN;
341 } else if (!strcmp(str, "LOG4J_INFO") || !strcmp(str, "INFO")) {
342 return LTTNG_LOGLEVEL_LOG4J_INFO;
343 } else if (!strcmp(str, "LOG4J_DEBUG") || !strcmp(str, "DEBUG")) {
344 return LTTNG_LOGLEVEL_LOG4J_DEBUG;
345 } else if (!strcmp(str, "LOG4J_TRACE") || !strcmp(str, "TRACE")) {
346 return LTTNG_LOGLEVEL_LOG4J_TRACE;
347 } else if (!strcmp(str, "LOG4J_ALL") || !strcmp(str, "ALL")) {
348 return LTTNG_LOGLEVEL_LOG4J_ALL;
349 } else {
350 return -1;
351 }
352 }
353
354 /*
355 * Maps JUL loglevel from string to value
356 */
357 static int loglevel_jul_str_to_value(const char *inputstr)
358 {
359 int i = 0;
360 char str[LTTNG_SYMBOL_NAME_LEN];
361
362 if (!inputstr || strlen(inputstr) == 0) {
363 return -1;
364 }
365
366 /*
367 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
368 * added at the end of the loop so a the upper bound we avoid the overflow.
369 */
370 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
371 str[i] = toupper(inputstr[i]);
372 i++;
373 }
374 str[i] = '\0';
375
376 if (!strcmp(str, "JUL_OFF") || !strcmp(str, "OFF")) {
377 return LTTNG_LOGLEVEL_JUL_OFF;
378 } else if (!strcmp(str, "JUL_SEVERE") || !strcmp(str, "SEVERE")) {
379 return LTTNG_LOGLEVEL_JUL_SEVERE;
380 } else if (!strcmp(str, "JUL_WARNING") || !strcmp(str, "WARNING")) {
381 return LTTNG_LOGLEVEL_JUL_WARNING;
382 } else if (!strcmp(str, "JUL_INFO") || !strcmp(str, "INFO")) {
383 return LTTNG_LOGLEVEL_JUL_INFO;
384 } else if (!strcmp(str, "JUL_CONFIG") || !strcmp(str, "CONFIG")) {
385 return LTTNG_LOGLEVEL_JUL_CONFIG;
386 } else if (!strcmp(str, "JUL_FINE") || !strcmp(str, "FINE")) {
387 return LTTNG_LOGLEVEL_JUL_FINE;
388 } else if (!strcmp(str, "JUL_FINER") || !strcmp(str, "FINER")) {
389 return LTTNG_LOGLEVEL_JUL_FINER;
390 } else if (!strcmp(str, "JUL_FINEST") || !strcmp(str, "FINEST")) {
391 return LTTNG_LOGLEVEL_JUL_FINEST;
392 } else if (!strcmp(str, "JUL_ALL") || !strcmp(str, "ALL")) {
393 return LTTNG_LOGLEVEL_JUL_ALL;
394 } else {
395 return -1;
396 }
397 }
398
399 /*
400 * Maps Python loglevel from string to value
401 */
402 static int loglevel_python_str_to_value(const char *inputstr)
403 {
404 int i = 0;
405 char str[LTTNG_SYMBOL_NAME_LEN];
406
407 if (!inputstr || strlen(inputstr) == 0) {
408 return -1;
409 }
410
411 /*
412 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
413 * added at the end of the loop so a the upper bound we avoid the overflow.
414 */
415 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
416 str[i] = toupper(inputstr[i]);
417 i++;
418 }
419 str[i] = '\0';
420
421 if (!strcmp(str, "PYTHON_CRITICAL") || !strcmp(str, "CRITICAL")) {
422 return LTTNG_LOGLEVEL_PYTHON_CRITICAL;
423 } else if (!strcmp(str, "PYTHON_ERROR") || !strcmp(str, "ERROR")) {
424 return LTTNG_LOGLEVEL_PYTHON_ERROR;
425 } else if (!strcmp(str, "PYTHON_WARNING") || !strcmp(str, "WARNING")) {
426 return LTTNG_LOGLEVEL_PYTHON_WARNING;
427 } else if (!strcmp(str, "PYTHON_INFO") || !strcmp(str, "INFO")) {
428 return LTTNG_LOGLEVEL_PYTHON_INFO;
429 } else if (!strcmp(str, "PYTNON_DEBUG") || !strcmp(str, "DEBUG")) {
430 return LTTNG_LOGLEVEL_PYTHON_DEBUG;
431 } else if (!strcmp(str, "PYTHON_NOTSET") || !strcmp(str, "NOTSET")) {
432 return LTTNG_LOGLEVEL_PYTHON_NOTSET;
433 } else {
434 return -1;
435 }
436 }
437
438 /*
439 * Maps loglevel from string to value
440 */
441 static
442 int loglevel_str_to_value(const char *inputstr)
443 {
444 int i = 0;
445 char str[LTTNG_SYMBOL_NAME_LEN];
446
447 if (!inputstr || strlen(inputstr) == 0) {
448 return -1;
449 }
450
451 /*
452 * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
453 * added at the end of the loop so a the upper bound we avoid the overflow.
454 */
455 while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
456 str[i] = toupper(inputstr[i]);
457 i++;
458 }
459 str[i] = '\0';
460 if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
461 return LTTNG_LOGLEVEL_EMERG;
462 } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
463 return LTTNG_LOGLEVEL_ALERT;
464 } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
465 return LTTNG_LOGLEVEL_CRIT;
466 } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
467 return LTTNG_LOGLEVEL_ERR;
468 } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
469 return LTTNG_LOGLEVEL_WARNING;
470 } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
471 return LTTNG_LOGLEVEL_NOTICE;
472 } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
473 return LTTNG_LOGLEVEL_INFO;
474 } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
475 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
476 } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
477 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
478 } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
479 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
480 } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
481 return LTTNG_LOGLEVEL_DEBUG_MODULE;
482 } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
483 return LTTNG_LOGLEVEL_DEBUG_UNIT;
484 } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
485 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
486 } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
487 return LTTNG_LOGLEVEL_DEBUG_LINE;
488 } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
489 return LTTNG_LOGLEVEL_DEBUG;
490 } else {
491 return -1;
492 }
493 }
494
495 static
496 const char *print_channel_name(const char *name)
497 {
498 return name ? : DEFAULT_CHANNEL_NAME;
499 }
500
501 static
502 const char *print_raw_channel_name(const char *name)
503 {
504 return name ? : "<default>";
505 }
506
507 /*
508 * Mi print exlcusion list
509 */
510 static
511 int mi_print_exclusion(int count, char **names)
512 {
513 int i, ret;
514
515 assert(writer);
516
517 if (count == 0) {
518 ret = 0;
519 goto end;
520 }
521 ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
522 if (ret) {
523 goto end;
524 }
525
526 for (i = 0; i < count; i++) {
527 ret = mi_lttng_writer_write_element_string(writer,
528 config_element_exclusion, names[i]);
529 if (ret) {
530 goto end;
531 }
532 }
533
534 /* Close exclusions element */
535 ret = mi_lttng_writer_close_element(writer);
536
537 end:
538 return ret;
539 }
540
541 /*
542 * Return allocated string for pretty-printing exclusion names.
543 */
544 static
545 char *print_exclusions(int count, char **names)
546 {
547 int length = 0;
548 int i;
549 const char *preamble = " excluding ";
550 char *ret;
551
552 if (count == 0) {
553 return strdup("");
554 }
555
556 /* calculate total required length */
557 for (i = 0; i < count; i++) {
558 length += strlen(names[i]) + 1;
559 }
560
561 /* add length of preamble + one for NUL - one for last (missing) comma */
562 length += strlen(preamble);
563 ret = zmalloc(length);
564 if (!ret) {
565 return NULL;
566 }
567 strncpy(ret, preamble, length);
568 for (i = 0; i < count; i++) {
569 strcat(ret, names[i]);
570 if (i != count - 1) {
571 strcat(ret, ",");
572 }
573 }
574
575 return ret;
576 }
577
578 /*
579 * Compare list of exclusions against an event name.
580 * Return a list of legal exclusion names.
581 * Produce an error or a warning about others (depending on the situation)
582 */
583 static
584 int check_exclusion_subsets(const char *event_name,
585 const char *exclusions,
586 int *exclusion_count_ptr,
587 char ***exclusion_list_ptr)
588 {
589 const char *excluder_ptr;
590 const char *event_ptr;
591 const char *next_excluder;
592 int excluder_length;
593 int exclusion_count = 0;
594 char **exclusion_list = NULL;
595 int ret = CMD_SUCCESS;
596
597 if (event_name[strlen(event_name) - 1] != '*') {
598 ERR("Event %s: Excluders can only be used with wildcarded events", event_name);
599 goto error;
600 }
601
602 next_excluder = exclusions;
603 while (*next_excluder != 0) {
604 event_ptr = event_name;
605 excluder_ptr = next_excluder;
606 excluder_length = strcspn(next_excluder, ",");
607
608 /* Scan both the excluder and the event letter by letter */
609 while (1) {
610 char e, x;
611
612 e = *event_ptr;
613 x = *excluder_ptr;
614
615 if (x == '*') {
616 /* Event is a subset of the excluder */
617 ERR("Event %s: %.*s excludes all events from %s",
618 event_name,
619 excluder_length,
620 next_excluder,
621 event_name);
622 goto error;
623 }
624 if (e == '*') {
625 char *string;
626 char **new_exclusion_list;
627
628 /* Excluder is a proper subset of event */
629 string = strndup(next_excluder, excluder_length);
630 if (!string) {
631 PERROR("strndup error");
632 goto error;
633 }
634 new_exclusion_list = realloc(exclusion_list,
635 sizeof(char *) * (exclusion_count + 1));
636 if (!new_exclusion_list) {
637 PERROR("realloc");
638 free(string);
639 goto error;
640 }
641 exclusion_list = new_exclusion_list;
642 exclusion_count++;
643 exclusion_list[exclusion_count - 1] = string;
644 break;
645 }
646 if (x != e) {
647 /* Excluder and event sets have no common elements */
648 WARN("Event %s: %.*s does not exclude any events from %s",
649 event_name,
650 excluder_length,
651 next_excluder,
652 event_name);
653 break;
654 }
655 excluder_ptr++;
656 event_ptr++;
657 }
658 /* next excluder */
659 next_excluder += excluder_length;
660 if (*next_excluder == ',') {
661 next_excluder++;
662 }
663 }
664 goto end;
665 error:
666 while (exclusion_count--) {
667 free(exclusion_list[exclusion_count]);
668 }
669 if (exclusion_list != NULL) {
670 free(exclusion_list);
671 }
672 exclusion_list = NULL;
673 exclusion_count = 0;
674 ret = CMD_ERROR;
675 end:
676 *exclusion_count_ptr = exclusion_count;
677 *exclusion_list_ptr = exclusion_list;
678 return ret;
679 }
680 /*
681 * Enabling event using the lttng API.
682 * Note: in case of error only the last error code will be return.
683 */
684 static int enable_events(char *session_name)
685 {
686 int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS;
687 int error_holder = CMD_SUCCESS, warn = 0, error = 0, success = 1;
688 char *event_name, *channel_name = NULL;
689 struct lttng_event ev;
690 struct lttng_domain dom;
691 int exclusion_count = 0;
692 char **exclusion_list = NULL;
693
694 memset(&ev, 0, sizeof(ev));
695 memset(&dom, 0, sizeof(dom));
696
697 if (opt_kernel) {
698 if (opt_loglevel) {
699 WARN("Kernel loglevels are not supported.");
700 }
701 }
702
703 /* Create lttng domain */
704 if (opt_kernel) {
705 dom.type = LTTNG_DOMAIN_KERNEL;
706 dom.buf_type = LTTNG_BUFFER_GLOBAL;
707 } else if (opt_userspace) {
708 dom.type = LTTNG_DOMAIN_UST;
709 /* Default. */
710 dom.buf_type = LTTNG_BUFFER_PER_UID;
711 } else if (opt_jul) {
712 dom.type = LTTNG_DOMAIN_JUL;
713 /* Default. */
714 dom.buf_type = LTTNG_BUFFER_PER_UID;
715 } else if (opt_log4j) {
716 dom.type = LTTNG_DOMAIN_LOG4J;
717 /* Default. */
718 dom.buf_type = LTTNG_BUFFER_PER_UID;
719 } else if (opt_python) {
720 dom.type = LTTNG_DOMAIN_PYTHON;
721 /* Default. */
722 dom.buf_type = LTTNG_BUFFER_PER_UID;
723 } else {
724 /* Checked by the caller. */
725 assert(0);
726 }
727
728 if (opt_exclude) {
729 switch (dom.type) {
730 case LTTNG_DOMAIN_KERNEL:
731 case LTTNG_DOMAIN_JUL:
732 case LTTNG_DOMAIN_LOG4J:
733 case LTTNG_DOMAIN_PYTHON:
734 ERR("Event name exclusions are not yet implemented for %s events",
735 get_domain_str(dom.type));
736 ret = CMD_ERROR;
737 goto error;
738 case LTTNG_DOMAIN_UST:
739 /* Exclusions supported */
740 break;
741 default:
742 assert(0);
743 }
744 }
745
746 channel_name = opt_channel_name;
747
748 handle = lttng_create_handle(session_name, &dom);
749 if (handle == NULL) {
750 ret = -1;
751 goto error;
752 }
753
754 /* Prepare Mi */
755 if (lttng_opt_mi) {
756 /* Open a events element */
757 ret = mi_lttng_writer_open_element(writer, config_element_events);
758 if (ret) {
759 ret = CMD_ERROR;
760 goto error;
761 }
762 }
763
764 if (opt_enable_all) {
765 /* Default setup for enable all */
766 if (opt_kernel) {
767 ev.type = opt_event_type;
768 strcpy(ev.name, "*");
769 /* kernel loglevels not implemented */
770 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
771 } else {
772 ev.type = LTTNG_EVENT_TRACEPOINT;
773 strcpy(ev.name, "*");
774 ev.loglevel_type = opt_loglevel_type;
775 if (opt_loglevel) {
776 assert(opt_userspace || opt_jul || opt_log4j || opt_python);
777 if (opt_userspace) {
778 ev.loglevel = loglevel_str_to_value(opt_loglevel);
779 } else if (opt_jul) {
780 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
781 } else if (opt_log4j) {
782 ev.loglevel = loglevel_log4j_str_to_value(opt_loglevel);
783 } else if (opt_python) {
784 ev.loglevel = loglevel_python_str_to_value(opt_loglevel);
785 }
786 if (ev.loglevel == -1) {
787 ERR("Unknown loglevel %s", opt_loglevel);
788 ret = -LTTNG_ERR_INVALID;
789 goto error;
790 }
791 } else {
792 assert(opt_userspace || opt_jul || opt_log4j || opt_python);
793 if (opt_userspace) {
794 ev.loglevel = -1;
795 } else if (opt_jul) {
796 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
797 } else if (opt_log4j) {
798 ev.loglevel = LTTNG_LOGLEVEL_LOG4J_ALL;
799 } else if (opt_python) {
800 ev.loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG;
801 }
802 }
803 }
804
805 if (opt_exclude) {
806 ret = check_exclusion_subsets("*", opt_exclude,
807 &exclusion_count, &exclusion_list);
808 if (ret == CMD_ERROR) {
809 goto error;
810 }
811 ev.exclusion = 1;
812 }
813 if (!opt_filter) {
814 ret = lttng_enable_event_with_exclusions(handle,
815 &ev, channel_name,
816 NULL,
817 exclusion_count, exclusion_list);
818 if (ret < 0) {
819 switch (-ret) {
820 case LTTNG_ERR_KERN_EVENT_EXIST:
821 WARN("Kernel events already enabled (channel %s, session %s)",
822 print_channel_name(channel_name), session_name);
823 warn = 1;
824 break;
825 case LTTNG_ERR_TRACE_ALREADY_STARTED:
826 {
827 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
828 ERR("Events: %s (channel %s, session %s)",
829 msg,
830 print_channel_name(channel_name),
831 session_name);
832 error = 1;
833 break;
834 }
835 default:
836 ERR("Events: %s (channel %s, session %s)",
837 lttng_strerror(ret),
838 ret == -LTTNG_ERR_NEED_CHANNEL_NAME
839 ? print_raw_channel_name(channel_name)
840 : print_channel_name(channel_name),
841 session_name);
842 error = 1;
843 break;
844 }
845 goto end;
846 }
847
848 switch (opt_event_type) {
849 case LTTNG_EVENT_TRACEPOINT:
850 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
851 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
852
853 if (!exclusion_string) {
854 PERROR("Cannot allocate exclusion_string");
855 error = 1;
856 goto end;
857 }
858 MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
859 get_domain_str(dom.type),
860 exclusion_string,
861 print_channel_name(channel_name),
862 opt_loglevel);
863 free(exclusion_string);
864 } else {
865 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
866
867 if (!exclusion_string) {
868 PERROR("Cannot allocate exclusion_string");
869 error = 1;
870 goto end;
871 }
872 MSG("All %s tracepoints%s are enabled in channel %s",
873 get_domain_str(dom.type),
874 exclusion_string,
875 print_channel_name(channel_name));
876 free(exclusion_string);
877 }
878 break;
879 case LTTNG_EVENT_SYSCALL:
880 if (opt_kernel) {
881 MSG("All %s system calls are enabled in channel %s",
882 get_domain_str(dom.type),
883 print_channel_name(channel_name));
884 }
885 break;
886 case LTTNG_EVENT_ALL:
887 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
888 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
889
890 if (!exclusion_string) {
891 PERROR("Cannot allocate exclusion_string");
892 error = 1;
893 goto end;
894 }
895 MSG("All %s events%s are enabled in channel %s for loglevel %s",
896 get_domain_str(dom.type),
897 exclusion_string,
898 print_channel_name(channel_name),
899 opt_loglevel);
900 free(exclusion_string);
901 } else {
902 char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
903
904 if (!exclusion_string) {
905 PERROR("Cannot allocate exclusion_string");
906 error = 1;
907 goto end;
908 }
909 MSG("All %s events%s are enabled in channel %s",
910 get_domain_str(dom.type),
911 exclusion_string,
912 print_channel_name(channel_name));
913 free(exclusion_string);
914 }
915 break;
916 default:
917 /*
918 * We should not be here since lttng_enable_event should have
919 * failed on the event type.
920 */
921 goto error;
922 }
923 }
924
925 if (opt_filter) {
926 command_ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
927 opt_filter, exclusion_count, exclusion_list);
928 if (command_ret < 0) {
929 switch (-command_ret) {
930 case LTTNG_ERR_FILTER_EXIST:
931 WARN("Filter on all events is already enabled"
932 " (channel %s, session %s)",
933 print_channel_name(channel_name), session_name);
934 warn = 1;
935 break;
936 case LTTNG_ERR_TRACE_ALREADY_STARTED:
937 {
938 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
939 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
940 msg,
941 print_channel_name(channel_name),
942 session_name, opt_filter);
943 error = 1;
944 break;
945 }
946 default:
947 ERR("All events: %s (channel %s, session %s, filter \'%s\')",
948 lttng_strerror(command_ret),
949 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
950 ? print_raw_channel_name(channel_name)
951 : print_channel_name(channel_name),
952 session_name, opt_filter);
953 error = 1;
954 break;
955 }
956 error_holder = command_ret;
957 } else {
958 ev.filter = 1;
959 MSG("Filter '%s' successfully set", opt_filter);
960 }
961 }
962
963 if (lttng_opt_mi) {
964 /* The wildcard * is used for kernel and ust domain to
965 * represent ALL. We copy * in event name to force the wildcard use
966 * for kernel domain
967 *
968 * Note: this is strictly for semantic and printing while in
969 * machine interface mode.
970 */
971 strcpy(ev.name, "*");
972
973 /* If we reach here the events are enabled */
974 if (!error && !warn) {
975 ev.enabled = 1;
976 } else {
977 ev.enabled = 0;
978 success = 0;
979 }
980 ret = mi_lttng_event(writer, &ev, 1, handle->domain.type);
981 if (ret) {
982 ret = CMD_ERROR;
983 goto error;
984 }
985
986 /* print exclusion */
987 ret = mi_print_exclusion(exclusion_count, exclusion_list);
988 if (ret) {
989 ret = CMD_ERROR;
990 goto error;
991 }
992
993 /* Success ? */
994 ret = mi_lttng_writer_write_element_bool(writer,
995 mi_lttng_element_command_success, success);
996 if (ret) {
997 ret = CMD_ERROR;
998 goto error;
999 }
1000
1001 /* Close event element */
1002 ret = mi_lttng_writer_close_element(writer);
1003 if (ret) {
1004 ret = CMD_ERROR;
1005 goto error;
1006 }
1007 }
1008
1009 goto end;
1010 }
1011
1012 /* Strip event list */
1013 event_name = strtok(opt_event_list, ",");
1014 while (event_name != NULL) {
1015 /* Copy name and type of the event */
1016 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
1017 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1018 ev.type = opt_event_type;
1019
1020 /* Kernel tracer action */
1021 if (opt_kernel) {
1022 DBG("Enabling kernel event %s for channel %s",
1023 event_name,
1024 print_channel_name(channel_name));
1025
1026 switch (opt_event_type) {
1027 case LTTNG_EVENT_ALL: /* Enable tracepoints and syscalls */
1028 /* If event name differs from *, select tracepoint. */
1029 if (strcmp(ev.name, "*")) {
1030 ev.type = LTTNG_EVENT_TRACEPOINT;
1031 }
1032 break;
1033 case LTTNG_EVENT_TRACEPOINT:
1034 break;
1035 case LTTNG_EVENT_PROBE:
1036 ret = parse_probe_opts(&ev, opt_probe);
1037 if (ret) {
1038 ERR("Unable to parse probe options");
1039 ret = 0;
1040 goto error;
1041 }
1042 break;
1043 case LTTNG_EVENT_FUNCTION:
1044 ret = parse_probe_opts(&ev, opt_function);
1045 if (ret) {
1046 ERR("Unable to parse function probe options");
1047 ret = 0;
1048 goto error;
1049 }
1050 break;
1051 case LTTNG_EVENT_SYSCALL:
1052 ev.type = LTTNG_EVENT_SYSCALL;
1053 break;
1054 default:
1055 ret = CMD_UNDEFINED;
1056 goto error;
1057 }
1058
1059 /* kernel loglevels not implemented */
1060 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1061 } else if (opt_userspace) { /* User-space tracer action */
1062 DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
1063 print_channel_name(channel_name), opt_loglevel ? : "<all>");
1064
1065 switch (opt_event_type) {
1066 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
1067 /* Fall-through */
1068 case LTTNG_EVENT_TRACEPOINT:
1069 /* Copy name and type of the event */
1070 ev.type = LTTNG_EVENT_TRACEPOINT;
1071 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
1072 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1073 break;
1074 case LTTNG_EVENT_PROBE:
1075 case LTTNG_EVENT_FUNCTION:
1076 case LTTNG_EVENT_SYSCALL:
1077 default:
1078 ERR("Event type not available for user-space tracing");
1079 ret = CMD_UNSUPPORTED;
1080 goto error;
1081 }
1082
1083 if (opt_exclude) {
1084 ev.exclusion = 1;
1085 if (opt_event_type != LTTNG_EVENT_ALL && opt_event_type != LTTNG_EVENT_TRACEPOINT) {
1086 ERR("Exclusion option can only be used with tracepoint events");
1087 ret = CMD_ERROR;
1088 goto error;
1089 }
1090 /* Free previously allocated items */
1091 if (exclusion_list != NULL) {
1092 while (exclusion_count--) {
1093 free(exclusion_list[exclusion_count]);
1094 }
1095 free(exclusion_list);
1096 exclusion_list = NULL;
1097 }
1098 /* Check for proper subsets */
1099 ret = check_exclusion_subsets(event_name, opt_exclude,
1100 &exclusion_count, &exclusion_list);
1101 if (ret == CMD_ERROR) {
1102 goto error;
1103 }
1104 }
1105
1106 ev.loglevel_type = opt_loglevel_type;
1107 if (opt_loglevel) {
1108 ev.loglevel = loglevel_str_to_value(opt_loglevel);
1109 if (ev.loglevel == -1) {
1110 ERR("Unknown loglevel %s", opt_loglevel);
1111 ret = -LTTNG_ERR_INVALID;
1112 goto error;
1113 }
1114 } else {
1115 ev.loglevel = -1;
1116 }
1117 } else if (opt_jul || opt_log4j || opt_python) {
1118 if (opt_event_type != LTTNG_EVENT_ALL &&
1119 opt_event_type != LTTNG_EVENT_TRACEPOINT) {
1120 ERR("Event type not supported for domain.");
1121 ret = CMD_UNSUPPORTED;
1122 goto error;
1123 }
1124
1125 ev.loglevel_type = opt_loglevel_type;
1126 if (opt_loglevel) {
1127 if (opt_jul) {
1128 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
1129 } else if (opt_log4j) {
1130 ev.loglevel = loglevel_log4j_str_to_value(opt_loglevel);
1131 } else if (opt_python) {
1132 ev.loglevel = loglevel_python_str_to_value(opt_loglevel);
1133 }
1134 if (ev.loglevel == -1) {
1135 ERR("Unknown loglevel %s", opt_loglevel);
1136 ret = -LTTNG_ERR_INVALID;
1137 goto error;
1138 }
1139 } else {
1140 if (opt_jul) {
1141 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1142 } else if (opt_log4j) {
1143 ev.loglevel = LTTNG_LOGLEVEL_LOG4J_ALL;
1144 } else if (opt_python) {
1145 ev.loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG;
1146 }
1147 }
1148 ev.type = LTTNG_EVENT_TRACEPOINT;
1149 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
1150 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1151 } else {
1152 assert(0);
1153 }
1154
1155 if (!opt_filter) {
1156 char *exclusion_string;
1157
1158 command_ret = lttng_enable_event_with_exclusions(handle,
1159 &ev, channel_name,
1160 NULL, exclusion_count, exclusion_list);
1161 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
1162 if (!exclusion_string) {
1163 PERROR("Cannot allocate exclusion_string");
1164 error = 1;
1165 goto end;
1166 }
1167 if (command_ret < 0) {
1168 /* Turn ret to positive value to handle the positive error code */
1169 switch (-command_ret) {
1170 case LTTNG_ERR_KERN_EVENT_EXIST:
1171 WARN("Kernel event %s%s already enabled (channel %s, session %s)",
1172 event_name,
1173 exclusion_string,
1174 print_channel_name(channel_name), session_name);
1175 warn = 1;
1176 break;
1177 case LTTNG_ERR_TRACE_ALREADY_STARTED:
1178 {
1179 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
1180 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
1181 exclusion_string,
1182 msg,
1183 print_channel_name(channel_name),
1184 session_name);
1185 error = 1;
1186 break;
1187 }
1188 default:
1189 ERR("Event %s%s: %s (channel %s, session %s)", event_name,
1190 exclusion_string,
1191 lttng_strerror(command_ret),
1192 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
1193 ? print_raw_channel_name(channel_name)
1194 : print_channel_name(channel_name),
1195 session_name);
1196 error = 1;
1197 break;
1198 }
1199 error_holder = command_ret;
1200 } else {
1201 switch (dom.type) {
1202 case LTTNG_DOMAIN_KERNEL:
1203 case LTTNG_DOMAIN_UST:
1204 MSG("%s event %s%s created in channel %s",
1205 get_domain_str(dom.type),
1206 event_name,
1207 exclusion_string,
1208 print_channel_name(channel_name));
1209 break;
1210 case LTTNG_DOMAIN_JUL:
1211 case LTTNG_DOMAIN_LOG4J:
1212 case LTTNG_DOMAIN_PYTHON:
1213 /*
1214 * Don't print the default channel
1215 * name for agent domains.
1216 */
1217 MSG("%s event %s%s enabled",
1218 get_domain_str(dom.type),
1219 event_name,
1220 exclusion_string);
1221 break;
1222 default:
1223 assert(0);
1224 }
1225 }
1226 free(exclusion_string);
1227 }
1228
1229 if (opt_filter) {
1230 char *exclusion_string;
1231
1232 /* Filter present */
1233 ev.filter = 1;
1234
1235 command_ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
1236 opt_filter, exclusion_count, exclusion_list);
1237 exclusion_string = print_exclusions(exclusion_count, exclusion_list);
1238 if (!exclusion_string) {
1239 PERROR("Cannot allocate exclusion_string");
1240 error = 1;
1241 goto end;
1242 }
1243 if (command_ret < 0) {
1244 switch (-command_ret) {
1245 case LTTNG_ERR_FILTER_EXIST:
1246 WARN("Filter on event %s%s is already enabled"
1247 " (channel %s, session %s)",
1248 event_name,
1249 exclusion_string,
1250 print_channel_name(channel_name), session_name);
1251 warn = 1;
1252 break;
1253 case LTTNG_ERR_TRACE_ALREADY_STARTED:
1254 {
1255 const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
1256 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
1257 exclusion_string,
1258 msg,
1259 print_channel_name(channel_name),
1260 session_name, opt_filter);
1261 error = 1;
1262 break;
1263 }
1264 default:
1265 ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
1266 exclusion_string,
1267 lttng_strerror(command_ret),
1268 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
1269 ? print_raw_channel_name(channel_name)
1270 : print_channel_name(channel_name),
1271 session_name, opt_filter);
1272 error = 1;
1273 break;
1274 }
1275 error_holder = command_ret;
1276
1277 } else {
1278 MSG("Event %s%s: Filter '%s' successfully set",
1279 event_name, exclusion_string,
1280 opt_filter);
1281 }
1282 free(exclusion_string);
1283 }
1284
1285 if (lttng_opt_mi) {
1286 if (command_ret) {
1287 success = 0;
1288 ev.enabled = 0;
1289 } else {
1290 ev.enabled = 1;
1291 }
1292
1293 ret = mi_lttng_event(writer, &ev, 1, handle->domain.type);
1294 if (ret) {
1295 ret = CMD_ERROR;
1296 goto error;
1297 }
1298
1299 /* print exclusion */
1300 ret = mi_print_exclusion(exclusion_count, exclusion_list);
1301 if (ret) {
1302 ret = CMD_ERROR;
1303 goto error;
1304 }
1305
1306 /* Success ? */
1307 ret = mi_lttng_writer_write_element_bool(writer,
1308 mi_lttng_element_command_success, success);
1309 if (ret) {
1310 ret = CMD_ERROR;
1311 goto end;
1312 }
1313
1314 /* Close event element */
1315 ret = mi_lttng_writer_close_element(writer);
1316 if (ret) {
1317 ret = CMD_ERROR;
1318 goto end;
1319 }
1320 }
1321
1322 /* Next event */
1323 event_name = strtok(NULL, ",");
1324 /* Reset warn, error and success */
1325 success = 1;
1326 }
1327
1328 end:
1329 /* Close Mi */
1330 if (lttng_opt_mi) {
1331 /* Close events element */
1332 ret = mi_lttng_writer_close_element(writer);
1333 if (ret) {
1334 ret = CMD_ERROR;
1335 goto error;
1336 }
1337 }
1338 error:
1339 if (warn) {
1340 ret = CMD_WARNING;
1341 }
1342 if (error) {
1343 ret = CMD_ERROR;
1344 }
1345 lttng_destroy_handle(handle);
1346
1347 if (exclusion_list != NULL) {
1348 while (exclusion_count--) {
1349 free(exclusion_list[exclusion_count]);
1350 }
1351 free(exclusion_list);
1352 }
1353
1354 /* Overwrite ret with error_holder if there was an actual error with
1355 * enabling an event.
1356 */
1357 ret = error_holder ? error_holder : ret;
1358
1359 return ret;
1360 }
1361
1362 /*
1363 * Add event to trace session
1364 */
1365 int cmd_enable_events(int argc, const char **argv)
1366 {
1367 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
1368 static poptContext pc;
1369 char *session_name = NULL;
1370 int event_type = -1;
1371
1372 pc = poptGetContext(NULL, argc, argv, long_options, 0);
1373 poptReadDefaultConfig(pc, 0);
1374
1375 /* Default event type */
1376 opt_event_type = LTTNG_EVENT_ALL;
1377
1378 while ((opt = poptGetNextOpt(pc)) != -1) {
1379 switch (opt) {
1380 case OPT_HELP:
1381 usage(stdout);
1382 goto end;
1383 case OPT_TRACEPOINT:
1384 opt_event_type = LTTNG_EVENT_TRACEPOINT;
1385 break;
1386 case OPT_PROBE:
1387 opt_event_type = LTTNG_EVENT_PROBE;
1388 break;
1389 case OPT_FUNCTION:
1390 opt_event_type = LTTNG_EVENT_FUNCTION;
1391 break;
1392 case OPT_SYSCALL:
1393 opt_event_type = LTTNG_EVENT_SYSCALL;
1394 break;
1395 case OPT_USERSPACE:
1396 opt_userspace = 1;
1397 break;
1398 case OPT_LOGLEVEL:
1399 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
1400 opt_loglevel = poptGetOptArg(pc);
1401 break;
1402 case OPT_LOGLEVEL_ONLY:
1403 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
1404 opt_loglevel = poptGetOptArg(pc);
1405 break;
1406 case OPT_LIST_OPTIONS:
1407 list_cmd_options(stdout, long_options);
1408 goto end;
1409 case OPT_FILTER:
1410 break;
1411 case OPT_EXCLUDE:
1412 break;
1413 default:
1414 usage(stderr);
1415 ret = CMD_UNDEFINED;
1416 goto end;
1417 }
1418
1419 /* Validate event type. Multiple event type are not supported. */
1420 if (event_type == -1) {
1421 event_type = opt_event_type;
1422 } else {
1423 if (event_type != opt_event_type) {
1424 ERR("Multiple event type not supported.");
1425 ret = CMD_ERROR;
1426 goto end;
1427 }
1428 }
1429 }
1430
1431 ret = print_missing_or_multiple_domains(
1432 opt_kernel + opt_userspace + opt_jul + opt_log4j + opt_python);
1433 if (ret) {
1434 ret = CMD_ERROR;
1435 goto end;
1436 }
1437
1438 /* Mi check */
1439 if (lttng_opt_mi) {
1440 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
1441 if (!writer) {
1442 ret = -LTTNG_ERR_NOMEM;
1443 goto end;
1444 }
1445
1446 /* Open command element */
1447 ret = mi_lttng_writer_command_open(writer,
1448 mi_lttng_element_command_enable_event);
1449 if (ret) {
1450 ret = CMD_ERROR;
1451 goto end;
1452 }
1453
1454 /* Open output element */
1455 ret = mi_lttng_writer_open_element(writer,
1456 mi_lttng_element_command_output);
1457 if (ret) {
1458 ret = CMD_ERROR;
1459 goto end;
1460 }
1461 }
1462
1463 opt_event_list = (char*) poptGetArg(pc);
1464 if (opt_event_list == NULL && opt_enable_all == 0) {
1465 ERR("Missing event name(s).\n");
1466 usage(stderr);
1467 ret = CMD_ERROR;
1468 goto end;
1469 }
1470
1471 if (!opt_session_name) {
1472 session_name = get_session_name();
1473 if (session_name == NULL) {
1474 command_ret = CMD_ERROR;
1475 success = 0;
1476 goto mi_closing;
1477 }
1478 } else {
1479 session_name = opt_session_name;
1480 }
1481
1482 command_ret = enable_events(session_name);
1483 if (command_ret) {
1484 success = 0;
1485 goto mi_closing;
1486 }
1487
1488 mi_closing:
1489 /* Mi closing */
1490 if (lttng_opt_mi) {
1491 /* Close output element */
1492 ret = mi_lttng_writer_close_element(writer);
1493 if (ret) {
1494 ret = CMD_ERROR;
1495 goto end;
1496 }
1497
1498 ret = mi_lttng_writer_write_element_bool(writer,
1499 mi_lttng_element_command_success, success);
1500 if (ret) {
1501 ret = CMD_ERROR;
1502 goto end;
1503 }
1504
1505 /* Command element close */
1506 ret = mi_lttng_writer_command_close(writer);
1507 if (ret) {
1508 ret = CMD_ERROR;
1509 goto end;
1510 }
1511 }
1512
1513 end:
1514 /* Mi clean-up */
1515 if (writer && mi_lttng_writer_destroy(writer)) {
1516 /* Preserve original error code */
1517 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
1518 }
1519
1520 if (opt_session_name == NULL) {
1521 free(session_name);
1522 }
1523
1524 /* Overwrite ret if an error occurred in enable_events */
1525 ret = command_ret ? command_ret : ret;
1526
1527 poptFreeContext(pc);
1528 return ret;
1529 }
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