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Change the UST event hash table match function
[lttng-tools.git] / src / bin / lttng / commands / enable_events.c
CommitLineData
f3ed775e
DG		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM		 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.
f3ed775e
DG		 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 *
d14d33bf
AM		 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.
f3ed775e
DG		 16 */
17
18#define _GNU_SOURCE
19#include <popt.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <sys/stat.h>
24#include <sys/types.h>
25#include <unistd.h>
5a0de755 26#include <inttypes.h>
8f0d098b 27#include <ctype.h>
f3ed775e 28
c399183f 29#include "../command.h"
42224349 30#include <src/common/sessiond-comm/sessiond-comm.h>
f3ed775e
DG		 31
32static char *opt_event_list;
33static int opt_event_type;
0cda4f28
MD		 34static const char *opt_loglevel;
35static int opt_loglevel_type;
6181537c 36static int opt_kernel;
5440dc42 37static char *opt_session_name;
f3ed775e
DG		 38static int opt_userspace;
39static int opt_enable_all;
cf0e5467 40static char *opt_probe;
8f0d098b
MD		 41static char *opt_function;
42static char *opt_function_entry_symbol;
f3ed775e 43static char *opt_channel_name;
53a80697 44static char *opt_filter;
d78d6610
DG		 45#if 0
46/* Not implemented yet */
47static char *opt_cmd_name;
48static pid_t opt_pid;
49#endif
f3ed775e
DG		 50
51enum {
52 OPT_HELP = 1,
f3ed775e 53 OPT_TRACEPOINT,
cf0e5467 54 OPT_PROBE,
f3ed775e 55 OPT_FUNCTION,
8f0d098b 56 OPT_FUNCTION_ENTRY,
a54bd42d 57 OPT_SYSCALL,
eeac7d46 58 OPT_USERSPACE,
0cda4f28
MD		 59 OPT_LOGLEVEL,
60 OPT_LOGLEVEL_ONLY,
679b4943 61 OPT_LIST_OPTIONS,
53a80697 62 OPT_FILTER,
f3ed775e
DG		 63};
64
cd80958d
DG		 65static struct lttng_handle *handle;
66
f3ed775e
DG		 67static struct poptOption long_options[] = {
68 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
69 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42 70 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
e14f64a8 71 {"all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
f3ed775e
DG		 72 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
73 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
d78d6610 74 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
f3ed775e 75 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
7ebae521 76 {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
40e9d5d3 77 {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
b213d387
MD		 78#if 0
79 /*
80 * Currently removed from lttng kernel tracer. Removed from
81 * lttng UI to discourage its use.
82 */
40e9d5d3 83 {"function:entry", 0, POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
b213d387 84#endif
7ebae521 85 {"syscall", 0, POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
0cda4f28
MD		 86 {"loglevel", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
87 {"loglevel-only", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
679b4943 88 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
53a80697 89 {"filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
f3ed775e
DG		 90 {0, 0, 0, 0, 0, 0, 0}
91};
92
93/*
94 * usage
95 */
96static void usage(FILE *ofp)
97{
32a6298d 98 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [-k|-u] [OPTIONS] \n");
f3ed775e 99 fprintf(ofp, "\n");
32a6298d 100 fprintf(ofp, "Options:\n");
f3ed775e 101 fprintf(ofp, " -h, --help Show this help\n");
679b4943 102 fprintf(ofp, " --list-options Simple listing of options\n");
32a6298d
DG		 103 fprintf(ofp, " -s, --session NAME Apply to session name\n");
104 fprintf(ofp, " -c, --channel NAME Apply to this channel\n");
e08bff8d 105 fprintf(ofp, " -a, --all Enable all tracepoints and syscalls\n");
f3ed775e 106 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
27221701 107 fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
f3ed775e
DG		 108 fprintf(ofp, "\n");
109 fprintf(ofp, "Event options:\n");
110 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
be49af1e
MD		 111 fprintf(ofp, " - userspace tracer supports wildcards at end of string.\n");
112 fprintf(ofp, " Don't forget to quote to deal with bash expansion.\n");
113 fprintf(ofp, " e.g.:\n");
114 fprintf(ofp, " \"*\"\n");
115 fprintf(ofp, " \"app_component:na*\"\n");
8f0d098b 116 fprintf(ofp, " --probe [addr | symbol | symbol+offset]\n");
cf0e5467
MD		 117 fprintf(ofp, " Dynamic probe.\n");
118 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
119 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
8f0d098b
MD		 120 fprintf(ofp, " --function [addr | symbol | symbol+offset]\n");
121 fprintf(ofp, " Dynamic function entry/return probe.\n");
122 fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
123 fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
b213d387 124#if 0
8f0d098b
MD		 125 fprintf(ofp, " --function:entry symbol\n");
126 fprintf(ofp, " Function tracer event\n");
b213d387 127#endif
a54bd42d 128 fprintf(ofp, " --syscall System call event\n");
f3ed775e 129 fprintf(ofp, "\n");
300b8fd5
MD		 130 fprintf(ofp, " --loglevel name\n");
131 fprintf(ofp, " Tracepoint loglevel range from 0 to loglevel\n");
132 fprintf(ofp, " --loglevel-only name\n");
133 fprintf(ofp, " Tracepoint loglevel (only this loglevel)\n");
134 fprintf(ofp, "\n");
0c8477c8
MD		 135 fprintf(ofp, " The loglevel or loglevel-only options should be\n");
136 fprintf(ofp, " combined with a tracepoint name or tracepoint\n");
137 fprintf(ofp, " wildcard.\n");
138 fprintf(ofp, " Available loglevels:\n");
139 fprintf(ofp, " (higher value is more verbose)\n");
46839cc2
MD		 140 fprintf(ofp, " TRACE_EMERG = 0\n");
141 fprintf(ofp, " TRACE_ALERT = 1\n");
142 fprintf(ofp, " TRACE_CRIT = 2\n");
143 fprintf(ofp, " TRACE_ERR = 3\n");
144 fprintf(ofp, " TRACE_WARNING = 4\n");
145 fprintf(ofp, " TRACE_NOTICE = 5\n");
146 fprintf(ofp, " TRACE_INFO = 6\n");
147 fprintf(ofp, " TRACE_DEBUG_SYSTEM = 7\n");
148 fprintf(ofp, " TRACE_DEBUG_PROGRAM = 8\n");
149 fprintf(ofp, " TRACE_DEBUG_PROCESS = 9\n");
150 fprintf(ofp, " TRACE_DEBUG_MODULE = 10\n");
151 fprintf(ofp, " TRACE_DEBUG_UNIT = 11\n");
152 fprintf(ofp, " TRACE_DEBUG_FUNCTION = 12\n");
153 fprintf(ofp, " TRACE_DEBUG_LINE = 13\n");
154 fprintf(ofp, " TRACE_DEBUG = 14\n");
155 fprintf(ofp, " (shortcuts such as \"system\" are allowed)\n");
53a80697
MD		 156 fprintf(ofp, " --filter \'expression\'\n");
157 fprintf(ofp, " Filter expression on event fields,\n");
158 fprintf(ofp, " event recording depends on evaluation.\n");
919e300c
MD		 159 fprintf(ofp, " Only specify on first activation of\n");
160 fprintf(ofp, " a given event within a session.\n");
161 fprintf(ofp, " Filter only allowed when enabling\n");
162 fprintf(ofp, " events within a session before tracing\n");
9bd578f5
MD		 163 fprintf(ofp, " is started. If the filter fails to link\n");
164 fprintf(ofp, " with the event within the traced domain,\n");
165 fprintf(ofp, " the event will be discarded. Currently,\n");
166 fprintf(ofp, " filter is only implemented for the user-space\n");
167 fprintf(ofp, " tracer.\n");
168 fprintf(ofp, " Expression examples:.\n");
169 fprintf(ofp, " \n");
170 fprintf(ofp, " 'intfield > 500 && intfield < 503'\n");
171 fprintf(ofp, " '(stringfield == \"test\" || intfield != 10) && intfield > 33'\n");
172 fprintf(ofp, " 'doublefield > 1.1 && intfield < 5.3'\n");
173 fprintf(ofp, " \n");
174 fprintf(ofp, " Wildcards are allowed at the end of strings:\n");
175 fprintf(ofp, " 'seqfield1 == \"te*\"'\n");
176 fprintf(ofp, " In string literals, the escape character is '\\'.\n");
177 fprintf(ofp, " Use '\\*' for the '*' character, and '\\\\' for\n");
178 fprintf(ofp, " the '\\' character.\n");
300b8fd5 179 fprintf(ofp, "\n");
f3ed775e
DG		 180}
181
0d63dd19 182/*
6181537c 183 * Parse probe options.
0d63dd19 184 */
cf0e5467 185static int parse_probe_opts(struct lttng_event *ev, char *opt)
0d63dd19
DG		 186{
187 int ret;
8ff0bbd0 188 char s_hex[19];
0d63dd19
DG		 189 char name[LTTNG_SYMBOL_NAME_LEN];
190
191 if (opt == NULL) {
192 ret = -1;
8f0d098b 193 goto end;
0d63dd19
DG		 194 }
195
196 /* Check for symbol+offset */
8ff0bbd0 197 ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
0d63dd19 198 if (ret == 2) {
7d29a247 199 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 200 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
cf0e5467 201 DBG("probe symbol %s", ev->attr.probe.symbol_name);
8ff0bbd0
DG		 202 if (strlen(s_hex) == 0) {
203 ERR("Invalid probe offset %s", s_hex);
0d63dd19 204 ret = -1;
8f0d098b 205 goto end;
0d63dd19 206 }
8ff0bbd0 207 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
cf0e5467 208 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
3000dc78 209 ev->attr.probe.addr = 0;
8f0d098b
MD		 210 goto end;
211 }
212
213 /* Check for symbol */
214 if (isalpha(name[0])) {
215 ret = sscanf(opt, "%s", name);
216 if (ret == 1) {
217 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 218 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
8f0d098b
MD		 219 DBG("probe symbol %s", ev->attr.probe.symbol_name);
220 ev->attr.probe.offset = 0;
221 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
222 ev->attr.probe.addr = 0;
223 goto end;
224 }
0d63dd19
DG		 225 }
226
227 /* Check for address */
8ff0bbd0 228 ret = sscanf(opt, "%s", s_hex);
0d63dd19 229 if (ret > 0) {
8ff0bbd0
DG		 230 if (strlen(s_hex) == 0) {
231 ERR("Invalid probe address %s", s_hex);
0d63dd19 232 ret = -1;
8f0d098b 233 goto end;
0d63dd19 234 }
8ff0bbd0 235 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
cf0e5467 236 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
3000dc78
DG		 237 ev->attr.probe.offset = 0;
238 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
8f0d098b 239 goto end;
0d63dd19
DG		 240 }
241
242 /* No match */
243 ret = -1;
244
8f0d098b 245end:
0d63dd19
DG		 246 return ret;
247}
248
8005f29a 249/*
0c8477c8 250 * Maps loglevel from string to value
8005f29a
MD		 251 */
252static
46839cc2 253int loglevel_str_to_value(const char *inputstr)
8005f29a 254{
46839cc2
MD		 255 int i = 0;
256 char str[LTTNG_SYMBOL_NAME_LEN];
257
258 while (inputstr[i] != '\0' && i < LTTNG_SYMBOL_NAME_LEN) {
259 str[i] = toupper(inputstr[i]);
260 i++;
261 }
262 str[i] = '\0';
263 if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
264 return LTTNG_LOGLEVEL_EMERG;
265 } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
266 return LTTNG_LOGLEVEL_ALERT;
267 } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
268 return LTTNG_LOGLEVEL_CRIT;
269 } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
270 return LTTNG_LOGLEVEL_ERR;
271 } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
272 return LTTNG_LOGLEVEL_WARNING;
273 } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
274 return LTTNG_LOGLEVEL_NOTICE;
275 } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
276 return LTTNG_LOGLEVEL_INFO;
277 } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
278 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
279 } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
280 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
281 } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
282 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
283 } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
284 return LTTNG_LOGLEVEL_DEBUG_MODULE;
285 } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
286 return LTTNG_LOGLEVEL_DEBUG_UNIT;
287 } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
288 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
289 } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
290 return LTTNG_LOGLEVEL_DEBUG_LINE;
291 } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
292 return LTTNG_LOGLEVEL_DEBUG;
8005f29a
MD		 293 } else {
294 return -1;
295 }
296}
297
f3ed775e 298/*
6181537c 299 * Enabling event using the lttng API.
f3ed775e 300 */
cd80958d 301static int enable_events(char *session_name)
f3ed775e 302{
ae856491 303 int err, ret = CMD_SUCCESS, warn = 0;
911a4811 304 unsigned int event_enabled = 0;
b73d0b29 305 char *event_name, *channel_name = NULL;
f3ed775e 306 struct lttng_event ev;
7d29a247 307 struct lttng_domain dom;
f3ed775e 308
441c16a7
MD		 309 memset(&ev, 0, sizeof(ev));
310 memset(&dom, 0, sizeof(dom));
311
53a80697
MD		 312 if (opt_kernel) {
313 if (opt_filter) {
314 ERR("Filter not implement for kernel tracing yet");
315 ret = CMD_ERROR;
316 goto error;
317 }
318 }
319
7d29a247
DG		 320 /* Create lttng domain */
321 if (opt_kernel) {
322 dom.type = LTTNG_DOMAIN_KERNEL;
d78d6610 323 } else if (opt_userspace) {
2bdd86d4 324 dom.type = LTTNG_DOMAIN_UST;
6181537c 325 } else {
e14f64a8 326 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
d16c1a4c 327 ret = CMD_ERROR;
6181537c 328 goto error;
2bdd86d4 329 }
7d29a247 330
ae856491
DG		 331 if (opt_channel_name == NULL) {
332 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
333 if (err < 0) {
334 ret = CMD_FATAL;
335 goto error;
336 }
337 } else {
338 channel_name = opt_channel_name;
339 }
340
cd80958d
DG		 341 handle = lttng_create_handle(session_name, &dom);
342 if (handle == NULL) {
343 ret = -1;
344 goto error;
345 }
1aef21b6 346
cd80958d 347 if (opt_enable_all) {
8c9ae521 348 /* Default setup for enable all */
75e8c5ab
MD		 349 if (opt_kernel) {
350 ev.type = opt_event_type;
351 ev.name[0] = '\0';
300b8fd5
MD		 352 /* kernel loglevels not implemented */
353 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
75e8c5ab
MD		 354 } else {
355 ev.type = LTTNG_EVENT_TRACEPOINT;
356 strcpy(ev.name, "*");
300b8fd5
MD		 357 ev.loglevel_type = opt_loglevel_type;
358 if (opt_loglevel) {
359 ev.loglevel = loglevel_str_to_value(opt_loglevel);
360 if (ev.loglevel == -1) {
361 ERR("Unknown loglevel %s", opt_loglevel);
2f70b271 362 ret = -LTTNG_ERR_INVALID;
300b8fd5
MD		 363 goto error;
364 }
22e25b71
MD		 365 } else {
366 ev.loglevel = -1;
300b8fd5 367 }
75e8c5ab 368 }
8c9ae521 369
911a4811
DG		 370 /* Reset flag before enabling a new event. */
371 event_enabled = 0;
372
8c9ae521
DG		 373 ret = lttng_enable_event(handle, &ev, channel_name);
374 if (ret < 0) {
42224349 375 switch (-ret) {
f73fabfd 376 case LTTNG_ERR_KERN_EVENT_EXIST:
42224349
DG		 377 WARN("Kernel events already enabled (channel %s, session %s)",
378 channel_name, session_name);
6d805133 379 break;
42224349 380 default:
a6de644c 381 ERR("Events: %s (channel %s, session %s)",
42224349
DG		 382 lttng_strerror(ret), channel_name, session_name);
383 break;
384 }
6d805133 385 goto end;
8c9ae521 386 }
911a4811 387 event_enabled = 1;
8c9ae521 388
0133c199
MD		 389 switch (opt_event_type) {
390 case LTTNG_EVENT_TRACEPOINT:
57064ada
MD		 391 if (opt_loglevel) {
392 MSG("All %s tracepoints are enabled in channel %s for loglevel %s",
16363652
DG		 393 opt_kernel ? "kernel" : "UST", channel_name,
394 opt_loglevel);
57064ada
MD		 395 } else {
396 MSG("All %s tracepoints are enabled in channel %s",
16363652 397 opt_kernel ? "kernel" : "UST", channel_name);
57064ada
MD		 398
399 }
0133c199 400 break;
a54bd42d 401 case LTTNG_EVENT_SYSCALL:
0133c199 402 if (opt_kernel) {
8c9ae521
DG		 403 MSG("All kernel system calls are enabled in channel %s",
404 channel_name);
c93d9daf 405 }
0133c199 406 break;
7a3d1328 407 case LTTNG_EVENT_ALL:
57064ada
MD		 408 if (opt_loglevel) {
409 MSG("All %s events are enabled in channel %s for loglevel %s",
16363652
DG		 410 opt_kernel ? "kernel" : "UST", channel_name,
411 opt_loglevel);
57064ada
MD		 412 } else {
413 MSG("All %s events are enabled in channel %s",
16363652 414 opt_kernel ? "kernel" : "UST", channel_name);
57064ada 415 }
7a3d1328 416 break;
0133c199 417 default:
8c9ae521 418 /*
6181537c
DG		 419 * We should not be here since lttng_enable_event should have
420 * failed on the event type.
8c9ae521 421 */
f3ed775e
DG		 422 goto error;
423 }
911a4811 424 if (opt_filter && event_enabled) {
178191b3 425 ret = lttng_set_event_filter(handle, &ev, channel_name,
16363652
DG		 426 opt_filter);
427 if (ret < 0) {
911a4811 428 fprintf(stderr, "Ret filter: %d\n", ret);
16363652
DG		 429 switch (-ret) {
430 case LTTNG_ERR_FILTER_EXIST:
ff7ef7b8 431 WARN("Filter on events is already enabled"
16363652
DG		 432 " (channel %s, session %s)",
433 channel_name, session_name);
434 break;
ff7ef7b8
DG		 435 case LTTNG_ERR_FILTER_INVAL:
436 case LTTNG_ERR_FILTER_NOMEM:
437 ERR("%s", lttng_strerror(ret));
16363652
DG		 438 default:
439 ERR("Setting filter: '%s'", opt_filter);
440 /*
441 * The event was successfully enabled before so when
442 * failing to set a filter, disable the event. This has
443 * been discussed in bug #343 on why we do that.
444 */
445 err = lttng_disable_event(handle, ev.name, channel_name);
446 if (err < 0) {
447 ERR("Disabling all events after filter error: %s",
448 lttng_strerror(err));
449 } else {
450 WARN("All events of channel %s have been disabled due "
451 "to a filter error", channel_name);
452 }
453 break;
454 }
455 goto error;
456 } else {
457 MSG("Filter '%s' successfully set", opt_filter);
458 }
459 }
8c9ae521 460 goto end;
f3ed775e
DG		 461 }
462
463 /* Strip event list */
464 event_name = strtok(opt_event_list, ",");
465 while (event_name != NULL) {
6181537c
DG		 466 /* Copy name and type of the event */
467 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
468 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
469 ev.type = opt_event_type;
470
f3ed775e
DG		 471 /* Kernel tracer action */
472 if (opt_kernel) {
473 DBG("Enabling kernel event %s for channel %s",
474 event_name, channel_name);
f3ed775e
DG		 475
476 switch (opt_event_type) {
7a3d1328
MD		 477 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
478 ev.type = LTTNG_EVENT_TRACEPOINT;
479 /* Fall-through */
e6ddca71 480 case LTTNG_EVENT_TRACEPOINT:
f3ed775e 481 break;
7d29a247 482 case LTTNG_EVENT_PROBE:
cf0e5467 483 ret = parse_probe_opts(&ev, opt_probe);
0d63dd19 484 if (ret < 0) {
cf0e5467 485 ERR("Unable to parse probe options");
0d63dd19
DG		 486 ret = 0;
487 goto error;
488 }
f3ed775e
DG		 489 break;
490 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD		 491 ret = parse_probe_opts(&ev, opt_function);
492 if (ret < 0) {
493 ERR("Unable to parse function probe options");
494 ret = 0;
495 goto error;
496 }
497 break;
498 case LTTNG_EVENT_FUNCTION_ENTRY:
6181537c
DG		 499 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
500 LTTNG_SYMBOL_NAME_LEN);
99497cd0 501 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
f3ed775e 502 break;
a54bd42d 503 case LTTNG_EVENT_SYSCALL:
6181537c
DG		 504 MSG("per-syscall selection not supported yet. Use \"-a\" "
505 "for all syscalls.");
f3ed775e 506 default:
1ab1ea0b 507 ret = CMD_UNDEFINED;
f3ed775e
DG		 508 goto error;
509 }
0cda4f28 510
ed7f4083 511 if (opt_loglevel) {
0cda4f28
MD		 512 MSG("Kernel loglevels are not supported.");
513 ret = CMD_UNDEFINED;
514 goto error;
515 }
516
517 /* kernel loglevels not implemented */
8005f29a 518 ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
f3ed775e 519 } else if (opt_userspace) { /* User-space tracer action */
d78d6610 520#if 0
e14f64a8
DG		 521 if (opt_cmd_name != NULL || opt_pid) {
522 MSG("Only supporting tracing all UST processes (-u) for now.");
1ab1ea0b 523 ret = CMD_UNDEFINED;
2bdd86d4
MD		 524 goto error;
525 }
d78d6610 526#endif
6181537c 527
300b8fd5
MD		 528 DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
529 channel_name, opt_loglevel ? : "<all>");
2bdd86d4
MD		 530
531 switch (opt_event_type) {
532 case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */
2bdd86d4
MD		 533 /* Fall-through */
534 case LTTNG_EVENT_TRACEPOINT:
e4baff1e
MD		 535 /* Copy name and type of the event */
536 ev.type = LTTNG_EVENT_TRACEPOINT;
537 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
538 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2bdd86d4
MD		 539 break;
540 case LTTNG_EVENT_PROBE:
541 case LTTNG_EVENT_FUNCTION:
542 case LTTNG_EVENT_FUNCTION_ENTRY:
543 case LTTNG_EVENT_SYSCALL:
544 default:
cc62c0c0 545 ERR("Event type not available for user-space tracing");
1ab1ea0b 546 ret = CMD_UNDEFINED;
2bdd86d4
MD		 547 goto error;
548 }
0cda4f28
MD		 549
550 ev.loglevel_type = opt_loglevel_type;
ed7f4083 551 if (opt_loglevel) {
8005f29a
MD		 552 ev.loglevel = loglevel_str_to_value(opt_loglevel);
553 if (ev.loglevel == -1) {
554 ERR("Unknown loglevel %s", opt_loglevel);
2f70b271 555 ret = -LTTNG_ERR_INVALID;
8005f29a
MD		 556 goto error;
557 }
22e25b71
MD		 558 } else {
559 ev.loglevel = -1;
ed7f4083 560 }
f3ed775e 561 } else {
e14f64a8 562 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
300b8fd5 563 ret = CMD_ERROR;
f3ed775e
DG		 564 goto error;
565 }
566
911a4811
DG		 567 /* Reset flag before enabling a new event. */
568 event_enabled = 0;
569
6181537c 570 ret = lttng_enable_event(handle, &ev, channel_name);
ae856491 571 if (ret < 0) {
42224349
DG		 572 /* Turn ret to positive value to handle the positive error code */
573 switch (-ret) {
f73fabfd 574 case LTTNG_ERR_KERN_EVENT_EXIST:
42224349
DG		 575 WARN("Kernel event %s already enabled (channel %s, session %s)",
576 event_name, channel_name, session_name);
577 break;
578 default:
579 ERR("Event %s: %s (channel %s, session %s)", event_name,
580 lttng_strerror(ret), channel_name, session_name);
581 break;
582 }
ae856491
DG		 583 warn = 1;
584 } else {
6181537c
DG		 585 MSG("%s event %s created in channel %s",
586 opt_kernel ? "kernel": "UST", event_name, channel_name);
911a4811 587 event_enabled = 1;
6181537c 588 }
911a4811 589 if (opt_filter && event_enabled) {
178191b3 590 ret = lttng_set_event_filter(handle, &ev, channel_name,
16363652 591 opt_filter);
53a80697 592 if (ret < 0) {
7671f53c
CB		 593 switch (-ret) {
594 case LTTNG_ERR_FILTER_EXIST:
ff7ef7b8 595 WARN("Filter on event %s is already enabled"
7671f53c
CB		 596 " (channel %s, session %s)",
597 event_name, channel_name, session_name);
598 break;
ff7ef7b8
DG		 599 case LTTNG_ERR_FILTER_INVAL:
600 case LTTNG_ERR_FILTER_NOMEM:
601 ERR("%s", lttng_strerror(ret));
7671f53c 602 default:
16363652
DG		 603 ERR("Setting filter for event %s: '%s'", ev.name,
604 opt_filter);
605 /*
606 * The event was successfully enabled before so when
607 * failing to set a filter, disable the event. This has
608 * been discussed in bug #343 on why we do that.
609 */
610 err = lttng_disable_event(handle, ev.name, channel_name);
611 if (err < 0) {
612 ERR("Disabling event %s after filter error: %s",
613 ev.name, lttng_strerror(err));
614 } else {
615 WARN("Event %s of channel %s has been disabled due "
616 "to a filter error", ev.name, channel_name);
617 }
7671f53c
CB		 618 break;
619 }
53a80697 620 goto error;
16363652
DG		 621 } else {
622 MSG("Filter '%s' successfully set", opt_filter);
53a80697
MD		 623 }
624 }
6181537c 625
f3ed775e
DG		 626 /* Next event */
627 event_name = strtok(NULL, ",");
628 }
629
8c9ae521 630end:
f3ed775e 631error:
ae856491
DG		 632 if (warn) {
633 ret = CMD_WARNING;
634 }
b73d0b29
MD		 635 if (opt_channel_name == NULL) {
636 free(channel_name);
637 }
cd80958d
DG		 638 lttng_destroy_handle(handle);
639
f3ed775e
DG		 640 return ret;
641}
642
643/*
6181537c 644 * Add event to trace session
f3ed775e
DG		 645 */
646int cmd_enable_events(int argc, const char **argv)
647{
ca1c3607 648 int opt, ret = CMD_SUCCESS;
f3ed775e 649 static poptContext pc;
cd80958d 650 char *session_name = NULL;
f3ed775e
DG		 651
652 pc = poptGetContext(NULL, argc, argv, long_options, 0);
653 poptReadDefaultConfig(pc, 0);
654
655 /* Default event type */
7a3d1328 656 opt_event_type = LTTNG_EVENT_ALL;
f3ed775e
DG		 657
658 while ((opt = poptGetNextOpt(pc)) != -1) {
659 switch (opt) {
660 case OPT_HELP:
ca1c3607 661 usage(stdout);
f3ed775e 662 goto end;
f3ed775e 663 case OPT_TRACEPOINT:
e6ddca71 664 opt_event_type = LTTNG_EVENT_TRACEPOINT;
f3ed775e 665 break;
cf0e5467 666 case OPT_PROBE:
7d29a247 667 opt_event_type = LTTNG_EVENT_PROBE;
f3ed775e
DG		 668 break;
669 case OPT_FUNCTION:
670 opt_event_type = LTTNG_EVENT_FUNCTION;
8f0d098b
MD		 671 break;
672 case OPT_FUNCTION_ENTRY:
673 opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
f3ed775e 674 break;
a54bd42d
MD		 675 case OPT_SYSCALL:
676 opt_event_type = LTTNG_EVENT_SYSCALL;
0133c199 677 break;
eeac7d46
MD		 678 case OPT_USERSPACE:
679 opt_userspace = 1;
eeac7d46 680 break;
0cda4f28 681 case OPT_LOGLEVEL:
8005f29a 682 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
0cda4f28
MD		 683 opt_loglevel = poptGetOptArg(pc);
684 break;
685 case OPT_LOGLEVEL_ONLY:
8005f29a 686 opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
0cda4f28 687 opt_loglevel = poptGetOptArg(pc);
13dce3b7 688 break;
679b4943
SM		 689 case OPT_LIST_OPTIONS:
690 list_cmd_options(stdout, long_options);
679b4943 691 goto end;
53a80697
MD		 692 case OPT_FILTER:
693 break;
f3ed775e
DG		 694 default:
695 usage(stderr);
696 ret = CMD_UNDEFINED;
697 goto end;
698 }
699 }
700
701 opt_event_list = (char*) poptGetArg(pc);
702 if (opt_event_list == NULL && opt_enable_all == 0) {
703 ERR("Missing event name(s).\n");
704 usage(stderr);
ca1c3607 705 ret = CMD_ERROR;
f3ed775e
DG		 706 goto end;
707 }
708
cd80958d
DG		 709 if (!opt_session_name) {
710 session_name = get_session_name();
711 if (session_name == NULL) {
ca1c3607 712 ret = CMD_ERROR;
cd80958d
DG		 713 goto end;
714 }
715 } else {
716 session_name = opt_session_name;
717 }
718
719 ret = enable_events(session_name);
f3ed775e
DG		 720
721end:
cd80958d
DG		 722 if (opt_session_name == NULL) {
723 free(session_name);
724 }
725
ca1c3607 726 poptFreeContext(pc);
f3ed775e
DG		 727 return ret;
728}
LTTng 2.0 tools and control repository
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