Commit | Line | Data |
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50656eec MH |
1 | /* |
2 | * probe-event.c : perf-probe definition to kprobe_events format converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #define _GNU_SOURCE | |
23 | #include <sys/utsname.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | #include <stdio.h> | |
29 | #include <unistd.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
4de189fe MH |
32 | #include <stdarg.h> |
33 | #include <limits.h> | |
50656eec MH |
34 | |
35 | #undef _GNU_SOURCE | |
36 | #include "event.h" | |
e1c01d61 | 37 | #include "string.h" |
4de189fe | 38 | #include "strlist.h" |
50656eec MH |
39 | #include "debug.h" |
40 | #include "parse-events.h" /* For debugfs_path */ | |
41 | #include "probe-event.h" | |
42 | ||
43 | #define MAX_CMDLEN 256 | |
44 | #define MAX_PROBE_ARGS 128 | |
45 | #define PERFPROBE_GROUP "probe" | |
46 | ||
47 | #define semantic_error(msg ...) die("Semantic error :" msg) | |
48 | ||
4de189fe | 49 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
50 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
51 | __attribute__((format(printf, 3, 4))); | |
52 | ||
4de189fe MH |
53 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
54 | { | |
55 | int ret; | |
56 | va_list ap; | |
57 | va_start(ap, format); | |
58 | ret = vsnprintf(str, size, format, ap); | |
59 | va_end(ap); | |
60 | if (ret >= (int)size) | |
61 | ret = -E2BIG; | |
62 | return ret; | |
63 | } | |
64 | ||
50656eec MH |
65 | /* Parse probepoint definition. */ |
66 | static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp) | |
67 | { | |
68 | char *ptr, *tmp; | |
69 | char c, nc = 0; | |
70 | /* | |
71 | * <Syntax> | |
af663d75 MH |
72 | * perf probe [EVENT=]SRC:LN |
73 | * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC] | |
74 | * | |
75 | * TODO:Group name support | |
50656eec MH |
76 | */ |
77 | ||
af663d75 MH |
78 | ptr = strchr(arg, '='); |
79 | if (ptr) { /* Event name */ | |
80 | *ptr = '\0'; | |
81 | tmp = ptr + 1; | |
82 | ptr = strchr(arg, ':'); | |
83 | if (ptr) /* Group name is not supported yet. */ | |
84 | semantic_error("Group name is not supported yet."); | |
85 | pp->event = strdup(arg); | |
86 | arg = tmp; | |
87 | } | |
88 | ||
50656eec MH |
89 | ptr = strpbrk(arg, ":+@%"); |
90 | if (ptr) { | |
91 | nc = *ptr; | |
92 | *ptr++ = '\0'; | |
93 | } | |
94 | ||
95 | /* Check arg is function or file and copy it */ | |
96 | if (strchr(arg, '.')) /* File */ | |
97 | pp->file = strdup(arg); | |
98 | else /* Function */ | |
99 | pp->function = strdup(arg); | |
100 | DIE_IF(pp->file == NULL && pp->function == NULL); | |
101 | ||
102 | /* Parse other options */ | |
103 | while (ptr) { | |
104 | arg = ptr; | |
105 | c = nc; | |
106 | ptr = strpbrk(arg, ":+@%"); | |
107 | if (ptr) { | |
108 | nc = *ptr; | |
109 | *ptr++ = '\0'; | |
110 | } | |
111 | switch (c) { | |
112 | case ':': /* Line number */ | |
113 | pp->line = strtoul(arg, &tmp, 0); | |
114 | if (*tmp != '\0') | |
115 | semantic_error("There is non-digit charactor" | |
116 | " in line number."); | |
117 | break; | |
118 | case '+': /* Byte offset from a symbol */ | |
119 | pp->offset = strtoul(arg, &tmp, 0); | |
120 | if (*tmp != '\0') | |
121 | semantic_error("There is non-digit charactor" | |
122 | " in offset."); | |
123 | break; | |
124 | case '@': /* File name */ | |
125 | if (pp->file) | |
126 | semantic_error("SRC@SRC is not allowed."); | |
127 | pp->file = strdup(arg); | |
128 | DIE_IF(pp->file == NULL); | |
129 | if (ptr) | |
130 | semantic_error("@SRC must be the last " | |
131 | "option."); | |
132 | break; | |
133 | case '%': /* Probe places */ | |
134 | if (strcmp(arg, "return") == 0) { | |
135 | pp->retprobe = 1; | |
136 | } else /* Others not supported yet */ | |
137 | semantic_error("%%%s is not supported.", arg); | |
138 | break; | |
139 | default: | |
140 | DIE_IF("Program has a bug."); | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | /* Exclusion check */ | |
146 | if (pp->line && pp->offset) | |
147 | semantic_error("Offset can't be used with line number."); | |
148 | ||
149 | if (!pp->line && pp->file && !pp->function) | |
150 | semantic_error("File always requires line number."); | |
151 | ||
152 | if (pp->offset && !pp->function) | |
153 | semantic_error("Offset requires an entry function."); | |
154 | ||
155 | if (pp->retprobe && !pp->function) | |
156 | semantic_error("Return probe requires an entry function."); | |
157 | ||
158 | if ((pp->offset || pp->line) && pp->retprobe) | |
159 | semantic_error("Offset/Line can't be used with return probe."); | |
160 | ||
161 | pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n", | |
162 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe); | |
163 | } | |
164 | ||
165 | /* Parse perf-probe event definition */ | |
fac13fd5 MH |
166 | void parse_perf_probe_event(const char *str, struct probe_point *pp, |
167 | bool *need_dwarf) | |
50656eec | 168 | { |
e1c01d61 | 169 | char **argv; |
fac13fd5 MH |
170 | int argc, i; |
171 | ||
172 | *need_dwarf = false; | |
50656eec | 173 | |
e1c01d61 MH |
174 | argv = argv_split(str, &argc); |
175 | if (!argv) | |
176 | die("argv_split failed."); | |
177 | if (argc > MAX_PROBE_ARGS + 1) | |
178 | semantic_error("Too many arguments"); | |
50656eec MH |
179 | |
180 | /* Parse probe point */ | |
181 | parse_perf_probe_probepoint(argv[0], pp); | |
50656eec | 182 | if (pp->file || pp->line) |
fac13fd5 | 183 | *need_dwarf = true; |
50656eec | 184 | |
e1c01d61 | 185 | /* Copy arguments and ensure return probe has no C argument */ |
50656eec | 186 | pp->nr_args = argc - 1; |
e1c01d61 MH |
187 | pp->args = zalloc(sizeof(char *) * pp->nr_args); |
188 | for (i = 0; i < pp->nr_args; i++) { | |
189 | pp->args[i] = strdup(argv[i + 1]); | |
190 | if (!pp->args[i]) | |
191 | die("Failed to copy argument."); | |
50656eec MH |
192 | if (is_c_varname(pp->args[i])) { |
193 | if (pp->retprobe) | |
194 | semantic_error("You can't specify local" | |
195 | " variable for kretprobe"); | |
fac13fd5 | 196 | *need_dwarf = true; |
50656eec | 197 | } |
e1c01d61 | 198 | } |
50656eec | 199 | |
e1c01d61 | 200 | argv_free(argv); |
50656eec MH |
201 | } |
202 | ||
4de189fe | 203 | /* Parse kprobe_events event into struct probe_point */ |
af663d75 | 204 | void parse_trace_kprobe_event(const char *str, struct probe_point *pp) |
4de189fe MH |
205 | { |
206 | char pr; | |
207 | char *p; | |
208 | int ret, i, argc; | |
209 | char **argv; | |
210 | ||
211 | pr_debug("Parsing kprobe_events: %s\n", str); | |
212 | argv = argv_split(str, &argc); | |
213 | if (!argv) | |
214 | die("argv_split failed."); | |
215 | if (argc < 2) | |
216 | semantic_error("Too less arguments."); | |
217 | ||
218 | /* Scan event and group name. */ | |
93aaa45a | 219 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
af663d75 MH |
220 | &pr, (float *)(void *)&pp->group, |
221 | (float *)(void *)&pp->event); | |
4de189fe MH |
222 | if (ret != 3) |
223 | semantic_error("Failed to parse event name: %s", argv[0]); | |
af663d75 | 224 | pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr); |
4de189fe MH |
225 | |
226 | pp->retprobe = (pr == 'r'); | |
227 | ||
228 | /* Scan function name and offset */ | |
af663d75 MH |
229 | ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function, |
230 | &pp->offset); | |
4de189fe MH |
231 | if (ret == 1) |
232 | pp->offset = 0; | |
233 | ||
234 | /* kprobe_events doesn't have this information */ | |
235 | pp->line = 0; | |
236 | pp->file = NULL; | |
237 | ||
238 | pp->nr_args = argc - 2; | |
239 | pp->args = zalloc(sizeof(char *) * pp->nr_args); | |
240 | for (i = 0; i < pp->nr_args; i++) { | |
241 | p = strchr(argv[i + 2], '='); | |
242 | if (p) /* We don't need which register is assigned. */ | |
243 | *p = '\0'; | |
244 | pp->args[i] = strdup(argv[i + 2]); | |
245 | if (!pp->args[i]) | |
246 | die("Failed to copy argument."); | |
247 | } | |
248 | ||
4de189fe MH |
249 | argv_free(argv); |
250 | } | |
251 | ||
252 | int synthesize_perf_probe_event(struct probe_point *pp) | |
253 | { | |
254 | char *buf; | |
255 | char offs[64] = "", line[64] = ""; | |
256 | int i, len, ret; | |
257 | ||
258 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
259 | if (!buf) | |
260 | die("Failed to allocate memory by zalloc."); | |
261 | if (pp->offset) { | |
262 | ret = e_snprintf(offs, 64, "+%d", pp->offset); | |
263 | if (ret <= 0) | |
264 | goto error; | |
265 | } | |
266 | if (pp->line) { | |
267 | ret = e_snprintf(line, 64, ":%d", pp->line); | |
268 | if (ret <= 0) | |
269 | goto error; | |
270 | } | |
271 | ||
272 | if (pp->function) | |
273 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function, | |
274 | offs, pp->retprobe ? "%return" : "", line); | |
275 | else | |
84988450 | 276 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line); |
4de189fe MH |
277 | if (ret <= 0) |
278 | goto error; | |
279 | len = ret; | |
280 | ||
281 | for (i = 0; i < pp->nr_args; i++) { | |
282 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", | |
283 | pp->args[i]); | |
284 | if (ret <= 0) | |
285 | goto error; | |
286 | len += ret; | |
287 | } | |
288 | pp->found = 1; | |
289 | ||
290 | return pp->found; | |
291 | error: | |
292 | free(pp->probes[0]); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
50656eec MH |
297 | int synthesize_trace_kprobe_event(struct probe_point *pp) |
298 | { | |
299 | char *buf; | |
300 | int i, len, ret; | |
301 | ||
302 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
303 | if (!buf) | |
304 | die("Failed to allocate memory by zalloc."); | |
4de189fe MH |
305 | ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset); |
306 | if (ret <= 0) | |
50656eec MH |
307 | goto error; |
308 | len = ret; | |
309 | ||
310 | for (i = 0; i < pp->nr_args; i++) { | |
4de189fe MH |
311 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
312 | pp->args[i]); | |
313 | if (ret <= 0) | |
50656eec MH |
314 | goto error; |
315 | len += ret; | |
316 | } | |
317 | pp->found = 1; | |
318 | ||
319 | return pp->found; | |
320 | error: | |
321 | free(pp->probes[0]); | |
50656eec MH |
322 | |
323 | return ret; | |
324 | } | |
325 | ||
4de189fe MH |
326 | static int open_kprobe_events(int flags, int mode) |
327 | { | |
328 | char buf[PATH_MAX]; | |
329 | int ret; | |
330 | ||
331 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
332 | if (ret < 0) | |
333 | die("Failed to make kprobe_events path."); | |
334 | ||
335 | ret = open(buf, flags, mode); | |
336 | if (ret < 0) { | |
337 | if (errno == ENOENT) | |
338 | die("kprobe_events file does not exist -" | |
339 | " please rebuild with CONFIG_KPROBE_TRACER."); | |
340 | else | |
341 | die("Could not open kprobe_events file: %s", | |
342 | strerror(errno)); | |
343 | } | |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* Get raw string list of current kprobe_events */ | |
348 | static struct strlist *get_trace_kprobe_event_rawlist(int fd) | |
349 | { | |
350 | int ret, idx; | |
351 | FILE *fp; | |
352 | char buf[MAX_CMDLEN]; | |
353 | char *p; | |
354 | struct strlist *sl; | |
355 | ||
356 | sl = strlist__new(true, NULL); | |
357 | ||
358 | fp = fdopen(dup(fd), "r"); | |
359 | while (!feof(fp)) { | |
360 | p = fgets(buf, MAX_CMDLEN, fp); | |
361 | if (!p) | |
362 | break; | |
363 | ||
364 | idx = strlen(p) - 1; | |
365 | if (p[idx] == '\n') | |
366 | p[idx] = '\0'; | |
367 | ret = strlist__add(sl, buf); | |
368 | if (ret < 0) | |
369 | die("strlist__add failed: %s", strerror(-ret)); | |
370 | } | |
371 | fclose(fp); | |
372 | ||
373 | return sl; | |
374 | } | |
375 | ||
376 | /* Free and zero clear probe_point */ | |
377 | static void clear_probe_point(struct probe_point *pp) | |
378 | { | |
379 | int i; | |
380 | ||
af663d75 MH |
381 | if (pp->event) |
382 | free(pp->event); | |
383 | if (pp->group) | |
384 | free(pp->group); | |
4de189fe MH |
385 | if (pp->function) |
386 | free(pp->function); | |
387 | if (pp->file) | |
388 | free(pp->file); | |
389 | for (i = 0; i < pp->nr_args; i++) | |
390 | free(pp->args[i]); | |
391 | if (pp->args) | |
392 | free(pp->args); | |
393 | for (i = 0; i < pp->found; i++) | |
394 | free(pp->probes[i]); | |
5660ce34 | 395 | memset(pp, 0, sizeof(*pp)); |
4de189fe MH |
396 | } |
397 | ||
278498d4 | 398 | /* Show an event */ |
af663d75 MH |
399 | static void show_perf_probe_event(const char *event, const char *place, |
400 | struct probe_point *pp) | |
278498d4 | 401 | { |
7e990a51 | 402 | int i, ret; |
278498d4 MH |
403 | char buf[128]; |
404 | ||
af663d75 | 405 | ret = e_snprintf(buf, 128, "%s:%s", pp->group, event); |
7e990a51 MH |
406 | if (ret < 0) |
407 | die("Failed to copy event: %s", strerror(-ret)); | |
278498d4 MH |
408 | printf(" %-40s (on %s", buf, place); |
409 | ||
410 | if (pp->nr_args > 0) { | |
411 | printf(" with"); | |
412 | for (i = 0; i < pp->nr_args; i++) | |
413 | printf(" %s", pp->args[i]); | |
414 | } | |
415 | printf(")\n"); | |
416 | } | |
417 | ||
4de189fe MH |
418 | /* List up current perf-probe events */ |
419 | void show_perf_probe_events(void) | |
420 | { | |
278498d4 | 421 | int fd, nr; |
4de189fe MH |
422 | struct probe_point pp; |
423 | struct strlist *rawlist; | |
424 | struct str_node *ent; | |
425 | ||
426 | fd = open_kprobe_events(O_RDONLY, 0); | |
427 | rawlist = get_trace_kprobe_event_rawlist(fd); | |
428 | close(fd); | |
429 | ||
adf365f4 | 430 | strlist__for_each(ent, rawlist) { |
af663d75 | 431 | parse_trace_kprobe_event(ent->s, &pp); |
278498d4 MH |
432 | /* Synthesize only event probe point */ |
433 | nr = pp.nr_args; | |
434 | pp.nr_args = 0; | |
4de189fe | 435 | synthesize_perf_probe_event(&pp); |
278498d4 MH |
436 | pp.nr_args = nr; |
437 | /* Show an event */ | |
af663d75 | 438 | show_perf_probe_event(pp.event, pp.probes[0], &pp); |
4de189fe MH |
439 | clear_probe_point(&pp); |
440 | } | |
441 | ||
442 | strlist__delete(rawlist); | |
443 | } | |
444 | ||
b498ce1f | 445 | /* Get current perf-probe event names */ |
fa28244d | 446 | static struct strlist *get_perf_event_names(int fd, bool include_group) |
b498ce1f | 447 | { |
fa28244d | 448 | char buf[128]; |
b498ce1f MH |
449 | struct strlist *sl, *rawlist; |
450 | struct str_node *ent; | |
af663d75 | 451 | struct probe_point pp; |
b498ce1f | 452 | |
af663d75 | 453 | memset(&pp, 0, sizeof(pp)); |
b498ce1f MH |
454 | rawlist = get_trace_kprobe_event_rawlist(fd); |
455 | ||
e1d2017b | 456 | sl = strlist__new(true, NULL); |
adf365f4 | 457 | strlist__for_each(ent, rawlist) { |
af663d75 | 458 | parse_trace_kprobe_event(ent->s, &pp); |
fa28244d | 459 | if (include_group) { |
af663d75 MH |
460 | if (e_snprintf(buf, 128, "%s:%s", pp.group, |
461 | pp.event) < 0) | |
fa28244d MH |
462 | die("Failed to copy group:event name."); |
463 | strlist__add(sl, buf); | |
464 | } else | |
af663d75 MH |
465 | strlist__add(sl, pp.event); |
466 | clear_probe_point(&pp); | |
b498ce1f MH |
467 | } |
468 | ||
469 | strlist__delete(rawlist); | |
470 | ||
471 | return sl; | |
472 | } | |
473 | ||
a9b495b0 | 474 | static void write_trace_kprobe_event(int fd, const char *buf) |
50656eec MH |
475 | { |
476 | int ret; | |
477 | ||
fa28244d | 478 | pr_debug("Writing event: %s\n", buf); |
50656eec MH |
479 | ret = write(fd, buf, strlen(buf)); |
480 | if (ret <= 0) | |
fa28244d | 481 | die("Failed to write event: %s", strerror(errno)); |
50656eec MH |
482 | } |
483 | ||
b498ce1f MH |
484 | static void get_new_event_name(char *buf, size_t len, const char *base, |
485 | struct strlist *namelist) | |
486 | { | |
487 | int i, ret; | |
17f88fcd MH |
488 | |
489 | /* Try no suffix */ | |
490 | ret = e_snprintf(buf, len, "%s", base); | |
491 | if (ret < 0) | |
492 | die("snprintf() failed: %s", strerror(-ret)); | |
493 | if (!strlist__has_entry(namelist, buf)) | |
494 | return; | |
495 | ||
496 | /* Try to add suffix */ | |
497 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f MH |
498 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
499 | if (ret < 0) | |
500 | die("snprintf() failed: %s", strerror(-ret)); | |
501 | if (!strlist__has_entry(namelist, buf)) | |
502 | break; | |
503 | } | |
504 | if (i == MAX_EVENT_INDEX) | |
505 | die("Too many events are on the same function."); | |
506 | } | |
507 | ||
50656eec MH |
508 | void add_trace_kprobe_events(struct probe_point *probes, int nr_probes) |
509 | { | |
510 | int i, j, fd; | |
511 | struct probe_point *pp; | |
512 | char buf[MAX_CMDLEN]; | |
b498ce1f MH |
513 | char event[64]; |
514 | struct strlist *namelist; | |
50656eec | 515 | |
b498ce1f MH |
516 | fd = open_kprobe_events(O_RDWR, O_APPEND); |
517 | /* Get current event names */ | |
fa28244d | 518 | namelist = get_perf_event_names(fd, false); |
50656eec MH |
519 | |
520 | for (j = 0; j < nr_probes; j++) { | |
521 | pp = probes + j; | |
af663d75 MH |
522 | if (!pp->event) |
523 | pp->event = strdup(pp->function); | |
524 | if (!pp->group) | |
525 | pp->group = strdup(PERFPROBE_GROUP); | |
526 | DIE_IF(!pp->event || !pp->group); | |
b498ce1f MH |
527 | for (i = 0; i < pp->found; i++) { |
528 | /* Get an unused new event name */ | |
af663d75 | 529 | get_new_event_name(event, 64, pp->event, namelist); |
b498ce1f MH |
530 | snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n", |
531 | pp->retprobe ? 'r' : 'p', | |
af663d75 | 532 | pp->group, event, |
b498ce1f | 533 | pp->probes[i]); |
50656eec | 534 | write_trace_kprobe_event(fd, buf); |
a9b495b0 MH |
535 | printf("Added new event:\n"); |
536 | /* Get the first parameter (probe-point) */ | |
537 | sscanf(pp->probes[i], "%s", buf); | |
af663d75 | 538 | show_perf_probe_event(event, buf, pp); |
b498ce1f MH |
539 | /* Add added event name to namelist */ |
540 | strlist__add(namelist, event); | |
541 | } | |
50656eec | 542 | } |
a9b495b0 MH |
543 | /* Show how to use the event. */ |
544 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
545 | printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event); | |
546 | ||
e1d2017b | 547 | strlist__delete(namelist); |
50656eec MH |
548 | close(fd); |
549 | } | |
fa28244d | 550 | |
bbbb521b MH |
551 | static void __del_trace_kprobe_event(int fd, struct str_node *ent) |
552 | { | |
553 | char *p; | |
554 | char buf[128]; | |
555 | ||
556 | /* Convert from perf-probe event to trace-kprobe event */ | |
557 | if (e_snprintf(buf, 128, "-:%s", ent->s) < 0) | |
558 | die("Failed to copy event."); | |
559 | p = strchr(buf + 2, ':'); | |
560 | if (!p) | |
561 | die("Internal error: %s should have ':' but not.", ent->s); | |
562 | *p = '/'; | |
563 | ||
564 | write_trace_kprobe_event(fd, buf); | |
565 | printf("Remove event: %s\n", ent->s); | |
566 | } | |
567 | ||
fa28244d MH |
568 | static void del_trace_kprobe_event(int fd, const char *group, |
569 | const char *event, struct strlist *namelist) | |
570 | { | |
571 | char buf[128]; | |
bbbb521b MH |
572 | struct str_node *ent, *n; |
573 | int found = 0; | |
fa28244d MH |
574 | |
575 | if (e_snprintf(buf, 128, "%s:%s", group, event) < 0) | |
576 | die("Failed to copy event."); | |
fa28244d | 577 | |
bbbb521b MH |
578 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
579 | strlist__for_each_safe(ent, n, namelist) | |
580 | if (strglobmatch(ent->s, buf)) { | |
581 | found++; | |
582 | __del_trace_kprobe_event(fd, ent); | |
583 | strlist__remove(namelist, ent); | |
584 | } | |
585 | } else { | |
586 | ent = strlist__find(namelist, buf); | |
587 | if (ent) { | |
588 | found++; | |
589 | __del_trace_kprobe_event(fd, ent); | |
590 | strlist__remove(namelist, ent); | |
591 | } | |
592 | } | |
593 | if (found == 0) | |
594 | pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf); | |
fa28244d MH |
595 | } |
596 | ||
597 | void del_trace_kprobe_events(struct strlist *dellist) | |
598 | { | |
599 | int fd; | |
fa28244d MH |
600 | const char *group, *event; |
601 | char *p, *str; | |
602 | struct str_node *ent; | |
603 | struct strlist *namelist; | |
604 | ||
605 | fd = open_kprobe_events(O_RDWR, O_APPEND); | |
606 | /* Get current event names */ | |
607 | namelist = get_perf_event_names(fd, true); | |
608 | ||
adf365f4 | 609 | strlist__for_each(ent, dellist) { |
fa28244d MH |
610 | str = strdup(ent->s); |
611 | if (!str) | |
612 | die("Failed to copy event."); | |
bbbb521b | 613 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
614 | p = strchr(str, ':'); |
615 | if (p) { | |
616 | group = str; | |
617 | *p = '\0'; | |
618 | event = p + 1; | |
619 | } else { | |
bbbb521b | 620 | group = "*"; |
fa28244d MH |
621 | event = str; |
622 | } | |
bbbb521b | 623 | pr_debug("Group: %s, Event: %s\n", group, event); |
fa28244d MH |
624 | del_trace_kprobe_event(fd, group, event, namelist); |
625 | free(str); | |
626 | } | |
627 | strlist__delete(namelist); | |
628 | close(fd); | |
629 | } | |
630 |