Fix realloc invalid next size
[lttng-tools.git] / lttng / commands / enable_events.c
CommitLineData
f3ed775e
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
82a3637f
DG
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
f3ed775e
DG
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <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>
5a0de755 27#include <inttypes.h>
8f0d098b 28#include <ctype.h>
f3ed775e 29
6e2d116c
DG
30#include "../cmd.h"
31#include "../conf.h"
32#include "../utils.h"
f3ed775e
DG
33
34static char *opt_event_list;
35static int opt_event_type;
36static char *opt_kernel;
5440dc42 37static char *opt_session_name;
f3ed775e
DG
38static int opt_pid_all;
39static int opt_userspace;
eeac7d46 40static char *opt_cmd_name;
f3ed775e
DG
41static int opt_enable_all;
42static pid_t opt_pid;
cf0e5467 43static char *opt_probe;
8f0d098b
MD
44static char *opt_function;
45static char *opt_function_entry_symbol;
f3ed775e
DG
46static char *opt_channel_name;
47
48enum {
49 OPT_HELP = 1,
f3ed775e
DG
50 OPT_TRACEPOINT,
51 OPT_MARKER,
cf0e5467 52 OPT_PROBE,
f3ed775e 53 OPT_FUNCTION,
8f0d098b 54 OPT_FUNCTION_ENTRY,
a54bd42d 55 OPT_SYSCALL,
eeac7d46 56 OPT_USERSPACE,
f3ed775e
DG
57};
58
cd80958d
DG
59static struct lttng_handle *handle;
60
f3ed775e
DG
61static struct poptOption long_options[] = {
62 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
63 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42 64 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
f3ed775e
DG
65 {"all-events", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
66 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
67 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
40e9d5d3 68 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
f3ed775e
DG
69 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
70 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
71 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
72 {"marker", 0, POPT_ARG_NONE, 0, OPT_MARKER, 0, 0},
7ebae521 73 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
40e9d5d3
MD
74 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
75 {"function:entry", 0, POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
7ebae521 76 {"syscall", 0, POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
f3ed775e
DG
77 {0, 0, 0, 0, 0, 0, 0}
78};
79
80/*
81 * usage
82 */
83static void usage(FILE *ofp)
84{
85 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
86 fprintf(ofp, "\n");
87 fprintf(ofp, " -h, --help Show this help\n");
5440dc42 88 fprintf(ofp, " -s, --session Apply on session name\n");
f3ed775e
DG
89 fprintf(ofp, " -c, --channel Apply on this channel\n");
90 fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
91 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
92 fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
93 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
94 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
95 fprintf(ofp, "\n");
96 fprintf(ofp, "Event options:\n");
97 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
8f0d098b 98 fprintf(ofp, " --probe [addr | symbol | symbol+offset]\n");
cf0e5467
MD
99 fprintf(ofp, " Dynamic probe.\n");
100 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
101 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
8f0d098b
MD
102 fprintf(ofp, " --function [addr | symbol | symbol+offset]\n");
103 fprintf(ofp, " Dynamic function entry/return probe.\n");
104 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
105 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
106 fprintf(ofp, " --function:entry symbol\n");
107 fprintf(ofp, " Function tracer event\n");
a54bd42d 108 fprintf(ofp, " --syscall System call event\n");
f3ed775e
DG
109 fprintf(ofp, " --marker User-space marker (deprecated)\n");
110 fprintf(ofp, "\n");
111}
112
0d63dd19 113/*
cf0e5467 114 * parse_probe_addr
0d63dd19 115 *
cf0e5467 116 * Parse probe options.
0d63dd19 117 */
cf0e5467 118static int parse_probe_opts(struct lttng_event *ev, char *opt)
0d63dd19
DG
119{
120 int ret;
8ff0bbd0 121 char s_hex[19];
0d63dd19
DG
122 char name[LTTNG_SYMBOL_NAME_LEN];
123
124 if (opt == NULL) {
125 ret = -1;
8f0d098b 126 goto end;
0d63dd19
DG
127 }
128
129 /* Check for symbol+offset */
8ff0bbd0 130 ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
0d63dd19 131 if (ret == 2) {
7d29a247 132 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 133 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
cf0e5467 134 DBG("probe symbol %s", ev->attr.probe.symbol_name);
8ff0bbd0
DG
135 if (strlen(s_hex) == 0) {
136 ERR("Invalid probe offset %s", s_hex);
0d63dd19 137 ret = -1;
8f0d098b 138 goto end;
0d63dd19 139 }
8ff0bbd0 140 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
cf0e5467 141 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
3000dc78 142 ev->attr.probe.addr = 0;
8f0d098b
MD
143 goto end;
144 }
145
146 /* Check for symbol */
147 if (isalpha(name[0])) {
148 ret = sscanf(opt, "%s", name);
149 if (ret == 1) {
150 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 151 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
8f0d098b
MD
152 DBG("probe symbol %s", ev->attr.probe.symbol_name);
153 ev->attr.probe.offset = 0;
154 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
155 ev->attr.probe.addr = 0;
156 goto end;
157 }
0d63dd19
DG
158 }
159
160 /* Check for address */
8ff0bbd0 161 ret = sscanf(opt, "%s", s_hex);
0d63dd19 162 if (ret > 0) {
8ff0bbd0
DG
163 if (strlen(s_hex) == 0) {
164 ERR("Invalid probe address %s", s_hex);
0d63dd19 165 ret = -1;
8f0d098b 166 goto end;
0d63dd19 167 }
8ff0bbd0 168 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
cf0e5467 169 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
3000dc78
DG
170 ev->attr.probe.offset = 0;
171 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
8f0d098b 172 goto end;
0d63dd19
DG
173 }
174
175 /* No match */
176 ret = -1;
177
8f0d098b 178end:
0d63dd19
DG
179 return ret;
180}
181
f3ed775e
DG
182/*
183 * enable_events
184 *
185 * Enabling event using the lttng API.
186 */
cd80958d 187static int enable_events(char *session_name)
f3ed775e
DG
188{
189 int err, ret = CMD_SUCCESS;
b73d0b29 190 char *event_name, *channel_name = NULL;
f3ed775e 191 struct lttng_event ev;
7d29a247 192 struct lttng_domain dom;
f3ed775e 193
f3ed775e
DG
194 if (opt_channel_name == NULL) {
195 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
196 if (err < 0) {
197 ret = CMD_FATAL;
198 goto error;
199 }
200 } else {
201 channel_name = opt_channel_name;
202 }
203
2bdd86d4
MD
204 if (opt_kernel && opt_userspace) {
205 MSG("Choose only one of --kernel or --userspace");
206 ret = CMD_FATAL;
207 goto error;
208 }
7d29a247
DG
209 /* Create lttng domain */
210 if (opt_kernel) {
211 dom.type = LTTNG_DOMAIN_KERNEL;
212 }
2bdd86d4
MD
213 if (opt_userspace) {
214 /* TODO
215 * LTTNG_DOMAIN_UST_EXEC_NAME,
216 * LTTNG_DOMAIN_UST_PID,
217 * LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
218 */
219 dom.type = LTTNG_DOMAIN_UST;
220 }
7d29a247 221
cd80958d
DG
222 handle = lttng_create_handle(session_name, &dom);
223 if (handle == NULL) {
224 ret = -1;
225 goto error;
226 }
1aef21b6 227
cd80958d 228 if (opt_enable_all) {
8c9ae521
DG
229 /* Default setup for enable all */
230 ev.name[0] = '\0';
231 ev.type = opt_event_type;
232
233 ret = lttng_enable_event(handle, &ev, channel_name);
234 if (ret < 0) {
235 goto error;
236 }
237
0133c199
MD
238 switch (opt_event_type) {
239 case LTTNG_EVENT_TRACEPOINT:
2bdd86d4
MD
240 MSG("All %s tracepoints are enabled in channel %s",
241 opt_kernel ? "kernel" : "UST", channel_name);
0133c199 242 break;
a54bd42d 243 case LTTNG_EVENT_SYSCALL:
0133c199 244 if (opt_kernel) {
8c9ae521
DG
245 MSG("All kernel system calls are enabled in channel %s",
246 channel_name);
c93d9daf 247 }
0133c199 248 break;
7a3d1328 249 case LTTNG_EVENT_ALL:
2bdd86d4
MD
250 MSG("All %s events are enabled in channel %s",
251 opt_kernel ? "kernel" : "UST", channel_name);
7a3d1328 252 break;
0133c199 253 default:
8c9ae521 254 /*
2bdd86d4
MD
255 * We should not be here since
256 * lttng_enable_event should have failed on the
257 * event type.
8c9ae521 258 */
f3ed775e
DG
259 goto error;
260 }
8c9ae521 261 goto end;
f3ed775e
DG
262 }
263
264 /* Strip event list */
265 event_name = strtok(opt_event_list, ",");
266 while (event_name != NULL) {
267 /* Kernel tracer action */
268 if (opt_kernel) {
269 DBG("Enabling kernel event %s for channel %s",
270 event_name, channel_name);
271 /* Copy name and type of the event */
272 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 273 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
f3ed775e
DG
274 ev.type = opt_event_type;
275
276 switch (opt_event_type) {
7a3d1328
MD
277 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
278 ev.type = LTTNG_EVENT_TRACEPOINT;
279 /* Fall-through */
e6ddca71 280 case LTTNG_EVENT_TRACEPOINT:
f3ed775e 281 break;
7d29a247 282 case LTTNG_EVENT_PROBE:
cf0e5467 283 ret = parse_probe_opts(&ev, opt_probe);
0d63dd19 284 if (ret < 0) {
cf0e5467 285 ERR("Unable to parse probe options");
0d63dd19
DG
286 ret = 0;
287 goto error;
288 }
f3ed775e
DG
289 break;
290 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD
291 ret = parse_probe_opts(&ev, opt_function);
292 if (ret < 0) {
293 ERR("Unable to parse function probe options");
294 ret = 0;
295 goto error;
296 }
297 break;
298 case LTTNG_EVENT_FUNCTION_ENTRY:
299 strncpy(ev.attr.ftrace.symbol_name,
300 opt_function_entry_symbol,
301 LTTNG_SYMBOL_NAME_LEN);
99497cd0 302 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
f3ed775e 303 break;
a54bd42d 304 case LTTNG_EVENT_SYSCALL:
0133c199
MD
305 MSG("per-syscall selection not supported yet. Use \"-a\" for all syscalls.");
306 ret = CMD_NOT_IMPLEMENTED;
307 goto error;
f3ed775e
DG
308 default:
309 ret = CMD_NOT_IMPLEMENTED;
310 goto error;
311 }
312
cd80958d 313 ret = lttng_enable_event(handle, &ev, channel_name);
7d29a247 314 if (ret == 0) {
f3ed775e
DG
315 MSG("Kernel event %s created in channel %s", event_name, channel_name);
316 }
317 } else if (opt_userspace) { /* User-space tracer action */
318 /*
2bdd86d4
MD
319 * TODO: only supporting pid_all tracing for
320 * now. Should have different domain based on
321 * opt_pid.
f3ed775e 322 */
2bdd86d4
MD
323 if (!opt_pid_all) {
324 MSG("Only supporting tracing all UST processes (-u --all) for now.");
325 ret = CMD_NOT_IMPLEMENTED;
326 goto error;
327 }
328 DBG("Enabling UST event %s for channel %s",
329 event_name, channel_name);
330 /* Copy name and type of the event */
331 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
332 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
333 ev.type = opt_event_type;
334
335 switch (opt_event_type) {
336 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
337 ev.type = LTTNG_EVENT_TRACEPOINT;
338 /* Fall-through */
339 case LTTNG_EVENT_TRACEPOINT:
340 break;
341 case LTTNG_EVENT_PROBE:
342 case LTTNG_EVENT_FUNCTION:
343 case LTTNG_EVENT_FUNCTION_ENTRY:
344 case LTTNG_EVENT_SYSCALL:
345 default:
346 ret = CMD_NOT_IMPLEMENTED;
347 goto error;
348 }
349
350 ret = lttng_enable_event(handle, &ev, channel_name);
351 if (ret == 0) {
352 MSG("UST event %s created in channel %s", event_name, channel_name);
f3ed775e 353 }
f3ed775e 354 } else {
048e2159 355 ERR("Please specify a tracer (--kernel or --userspace)");
f3ed775e
DG
356 goto error;
357 }
358
359 /* Next event */
360 event_name = strtok(NULL, ",");
361 }
362
8c9ae521 363end:
f3ed775e 364error:
b73d0b29
MD
365 if (opt_channel_name == NULL) {
366 free(channel_name);
367 }
cd80958d
DG
368 lttng_destroy_handle(handle);
369
f3ed775e
DG
370 return ret;
371}
372
373/*
374 * cmd_enable_events
375 *
376 * Add event to trace session
377 */
378int cmd_enable_events(int argc, const char **argv)
379{
380 int opt, ret;
381 static poptContext pc;
cd80958d 382 char *session_name = NULL;
f3ed775e
DG
383
384 pc = poptGetContext(NULL, argc, argv, long_options, 0);
385 poptReadDefaultConfig(pc, 0);
386
387 /* Default event type */
7a3d1328 388 opt_event_type = LTTNG_EVENT_ALL;
f3ed775e
DG
389
390 while ((opt = poptGetNextOpt(pc)) != -1) {
391 switch (opt) {
392 case OPT_HELP:
393 usage(stderr);
394 ret = CMD_SUCCESS;
395 goto end;
f3ed775e 396 case OPT_TRACEPOINT:
e6ddca71 397 opt_event_type = LTTNG_EVENT_TRACEPOINT;
f3ed775e
DG
398 break;
399 case OPT_MARKER:
400 ret = CMD_NOT_IMPLEMENTED;
401 goto end;
cf0e5467 402 case OPT_PROBE:
7d29a247 403 opt_event_type = LTTNG_EVENT_PROBE;
f3ed775e
DG
404 break;
405 case OPT_FUNCTION:
406 opt_event_type = LTTNG_EVENT_FUNCTION;
8f0d098b
MD
407 break;
408 case OPT_FUNCTION_ENTRY:
409 opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
f3ed775e 410 break;
a54bd42d
MD
411 case OPT_SYSCALL:
412 opt_event_type = LTTNG_EVENT_SYSCALL;
0133c199 413 break;
eeac7d46
MD
414 case OPT_USERSPACE:
415 opt_userspace = 1;
eeac7d46 416 break;
f3ed775e
DG
417 default:
418 usage(stderr);
419 ret = CMD_UNDEFINED;
420 goto end;
421 }
422 }
423
424 opt_event_list = (char*) poptGetArg(pc);
425 if (opt_event_list == NULL && opt_enable_all == 0) {
426 ERR("Missing event name(s).\n");
427 usage(stderr);
428 ret = CMD_SUCCESS;
429 goto end;
430 }
431
cd80958d
DG
432 if (!opt_session_name) {
433 session_name = get_session_name();
434 if (session_name == NULL) {
435 ret = -1;
436 goto end;
437 }
438 } else {
439 session_name = opt_session_name;
440 }
441
442 ret = enable_events(session_name);
f3ed775e
DG
443
444end:
cd80958d
DG
445 if (opt_session_name == NULL) {
446 free(session_name);
447 }
448
f3ed775e
DG
449 return ret;
450}
This page took 0.072248 seconds and 4 git commands to generate.