Commit | Line | Data |
---|---|---|
2727692a | 1 | /* libltt |
2 | * | |
3 | * Linux Trace Toolkit Netlink Control Library | |
4 | * | |
c928825d | 5 | * Controls the ltt-control kernel module through debugfs. |
2727692a | 6 | * |
7 | * Copyright 2005 - | |
8 | * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
9 | * | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10e8a188 | 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
2727692a | 19 | * GNU General Public License for more details. |
c928825d | 20 | * |
2727692a | 21 | */ |
22 | ||
23 | #ifdef HAVE_CONFIG_H | |
24 | #include <config.h> | |
25 | #endif | |
26 | ||
27 | #include <liblttctl/lttctl.h> | |
28 | #include <errno.h> | |
29 | #include <stdio.h> | |
2727692a | 30 | #include <string.h> |
c928825d | 31 | #include <dirent.h> |
32 | #include <limits.h> | |
33 | #include <fcntl.h> | |
34 | #include <stdlib.h> | |
2727692a | 35 | |
c928825d | 36 | #define MAX_CHANNEL (256) |
2727692a | 37 | |
c928825d | 38 | static char debugfsmntdir[PATH_MAX]; |
2727692a | 39 | |
c928825d | 40 | static int initdebugfsmntdir(void) |
2727692a | 41 | { |
354b34fd | 42 | return getdebugfsmntdir(debugfsmntdir); |
43 | } | |
2727692a | 44 | |
354b34fd | 45 | /* |
46 | * This function must called posterior to initdebugfsmntdir(), | |
47 | * because it need to use debugfsmntdir[] which is inited in initdebugfsmntdir() | |
48 | */ | |
49 | static int initmodule(void) | |
50 | { | |
51 | char controldirname[PATH_MAX]; | |
52 | DIR *dir; | |
53 | int tryload_done = 0; | |
54 | ||
55 | sprintf(controldirname, "%s/ltt/control/", debugfsmntdir); | |
56 | ||
57 | check_again: | |
58 | /* | |
59 | * Check ltt control's debugfs dir | |
60 | * | |
61 | * We don't check is ltt-trace-control module exist, because it maybe | |
62 | * compiled into kernel. | |
63 | */ | |
64 | dir = opendir(controldirname); | |
65 | if (dir) { | |
66 | closedir(dir); | |
67 | return 0; | |
c928825d | 68 | } |
2727692a | 69 | |
354b34fd | 70 | if (!tryload_done) { |
71 | system("modprobe ltt-trace-control"); | |
72 | tryload_done = 1; | |
73 | goto check_again; | |
2727692a | 74 | } |
354b34fd | 75 | |
76 | return -ENOENT; | |
c928825d | 77 | } |
78 | ||
79 | int lttctl_init(void) | |
80 | { | |
81 | int ret; | |
354b34fd | 82 | |
c928825d | 83 | |
84 | ret = initdebugfsmntdir(); | |
85 | if (ret) { | |
354b34fd | 86 | fprintf(stderr, "Get debugfs mount point failed\n"); |
4015ea80 | 87 | return ret; |
2727692a | 88 | } |
2727692a | 89 | |
354b34fd | 90 | ret = initmodule(); |
91 | if (ret) { | |
92 | fprintf(stderr, "Control module seems not work\n"); | |
4015ea80 | 93 | return ret; |
c928825d | 94 | } |
2727692a | 95 | |
c928825d | 96 | return 0; |
97 | } | |
2727692a | 98 | |
c928825d | 99 | int lttctl_destroy(void) |
2727692a | 100 | { |
c928825d | 101 | return 0; |
2727692a | 102 | } |
103 | ||
c928825d | 104 | static int lttctl_sendop(const char *fname, const char *op) |
2727692a | 105 | { |
c928825d | 106 | int fd; |
107 | ||
108 | if (!fname) { | |
109 | fprintf(stderr, "%s: args invalid\n", __func__); | |
110 | return 1; | |
111 | } | |
112 | ||
113 | fd = open(fname, O_WRONLY); | |
114 | if (fd == -1) { | |
115 | fprintf(stderr, "%s: open %s failed: %s\n", __func__, fname, | |
116 | strerror(errno)); | |
117 | return errno; | |
118 | } | |
119 | ||
120 | if (write(fd, op, strlen(op)) == -1) { | |
4015ea80 | 121 | int ret = errno; |
c928825d | 122 | fprintf(stderr, "%s: write %s to %s failed: %s\n", __func__, op, |
123 | fname, strerror(errno)); | |
124 | close(fd); | |
4015ea80 | 125 | return ret; |
c928825d | 126 | } |
2727692a | 127 | |
c928825d | 128 | close(fd); |
129 | ||
130 | return 0; | |
131 | } | |
2727692a | 132 | |
133 | /* | |
c928825d | 134 | * check is trace exist(check debugfsmntdir too) |
135 | * expect: | |
136 | * 0: expect that trace not exist | |
137 | * !0: expect that trace exist | |
138 | * | |
139 | * ret: | |
140 | * 0: check pass | |
4015ea80 | 141 | * -(EEXIST | ENOENT): check failed |
c928825d | 142 | * -ERRNO: error happened (no check) |
2727692a | 143 | */ |
c928825d | 144 | static int lttctl_check_trace(const char *name, int expect) |
2727692a | 145 | { |
c928825d | 146 | char tracedirname[PATH_MAX]; |
147 | DIR *dir; | |
148 | int exist; | |
2727692a | 149 | |
c928825d | 150 | if (!name) { |
151 | fprintf(stderr, "%s: args invalid\n", __func__); | |
152 | return -EINVAL; | |
2727692a | 153 | } |
c928825d | 154 | |
155 | if (!debugfsmntdir[0]) { | |
156 | fprintf(stderr, "%s: debugfsmntdir not valid\n", __func__); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | sprintf(tracedirname, "%s/ltt/control/%s", debugfsmntdir, name); | |
161 | ||
162 | dir = opendir(tracedirname); | |
163 | if (dir) { | |
164 | exist = 1; | |
22acd9c7 | 165 | closedir(dir); |
c928825d | 166 | } else { |
167 | if (errno != ENOENT) { | |
168 | fprintf(stderr, "%s: %s\n", __func__, strerror(errno)); | |
169 | return -EINVAL; | |
170 | } | |
171 | exist = 0; | |
172 | } | |
173 | ||
c928825d | 174 | if (!expect != !exist) { |
175 | if (exist) | |
4015ea80 | 176 | { |
c928825d | 177 | fprintf(stderr, "Trace %s already exist\n", name); |
4015ea80 | 178 | return -EEXIST; |
179 | } | |
c928825d | 180 | else |
4015ea80 | 181 | { |
c928825d | 182 | fprintf(stderr, "Trace %s not exist\n", name); |
4015ea80 | 183 | return -ENOENT; |
184 | } | |
185 | ||
c928825d | 186 | } |
187 | ||
188 | return 0; | |
2727692a | 189 | } |
190 | ||
191 | /* | |
c928825d | 192 | * get channel list of a trace |
193 | * don't include metadata channel when metadata is 0 | |
194 | * | |
195 | * return number of channel on success | |
196 | * return negative number on fail | |
197 | * Caller must free channellist. | |
2727692a | 198 | */ |
c928825d | 199 | static int lttctl_get_channellist(const char *tracename, |
200 | char ***channellist, int metadata) | |
2727692a | 201 | { |
c928825d | 202 | char tracedirname[PATH_MAX]; |
203 | struct dirent *dirent; | |
204 | DIR *dir; | |
205 | char **list = NULL, **old_list; | |
206 | int nr_chan = 0; | |
207 | ||
208 | sprintf(tracedirname, "%s/ltt/control/%s/channel", debugfsmntdir, | |
209 | tracename); | |
210 | ||
211 | dir = opendir(tracedirname); | |
212 | if (!dir) { | |
213 | nr_chan = -ENOENT; | |
214 | goto error; | |
215 | } | |
216 | ||
217 | for (;;) { | |
218 | dirent = readdir(dir); | |
219 | if (!dirent) | |
220 | break; | |
221 | if (!strcmp(dirent->d_name, ".") | |
222 | || !strcmp(dirent->d_name, "..")) | |
223 | continue; | |
224 | if (!metadata && !strcmp(dirent->d_name, "metadata")) | |
225 | continue; | |
226 | old_list = list; | |
227 | list = malloc(sizeof(char *) * ++nr_chan); | |
228 | memcpy(list, old_list, sizeof(*list) * (nr_chan - 1)); | |
229 | free(old_list); | |
230 | list[nr_chan - 1] = strdup(dirent->d_name); | |
231 | } | |
232 | ||
233 | closedir(dir); | |
234 | ||
235 | *channellist = list; | |
236 | return nr_chan; | |
237 | error: | |
238 | free(list); | |
239 | *channellist = NULL; | |
240 | return nr_chan; | |
241 | } | |
242 | ||
4015ea80 | 243 | static void lttctl_free_channellist(char **channellist, int n_channel) |
244 | { | |
245 | int i = 0; | |
246 | for(; i < n_channel; ++i) | |
247 | free(channellist[i]); | |
248 | free(channellist); | |
249 | } | |
250 | ||
c928825d | 251 | int lttctl_setup_trace(const char *name) |
252 | { | |
253 | int ret; | |
254 | char ctlfname[PATH_MAX]; | |
255 | ||
256 | if (!name) { | |
257 | fprintf(stderr, "%s: args invalid\n", __func__); | |
258 | ret = -EINVAL; | |
259 | goto arg_error; | |
260 | } | |
261 | ||
262 | ret = lttctl_check_trace(name, 0); | |
263 | if (ret) | |
264 | goto arg_error; | |
265 | ||
266 | sprintf(ctlfname, "%s/ltt/setup_trace", debugfsmntdir); | |
267 | ||
268 | ret = lttctl_sendop(ctlfname, name); | |
269 | if (ret) { | |
270 | fprintf(stderr, "Setup trace failed\n"); | |
271 | goto op_err; | |
2727692a | 272 | } |
c928825d | 273 | |
2727692a | 274 | return 0; |
c928825d | 275 | |
276 | op_err: | |
277 | arg_error: | |
278 | return ret; | |
2727692a | 279 | } |
280 | ||
c928825d | 281 | int lttctl_destroy_trace(const char *name) |
282 | { | |
283 | int ret; | |
284 | char ctlfname[PATH_MAX]; | |
285 | ||
286 | if (!name) { | |
287 | fprintf(stderr, "%s: args invalid\n", __func__); | |
288 | ret = -EINVAL; | |
289 | goto arg_error; | |
290 | } | |
291 | ||
292 | ret = lttctl_check_trace(name, 1); | |
293 | if (ret) | |
294 | goto arg_error; | |
295 | ||
296 | sprintf(ctlfname, "%s/ltt/destroy_trace", debugfsmntdir); | |
297 | ||
298 | ret = lttctl_sendop(ctlfname, name); | |
299 | if (ret) { | |
300 | fprintf(stderr, "Destroy trace failed\n"); | |
301 | goto op_err; | |
302 | } | |
303 | ||
304 | return 0; | |
305 | ||
306 | op_err: | |
307 | arg_error: | |
308 | return ret; | |
309 | } | |
2727692a | 310 | |
c928825d | 311 | int lttctl_alloc_trace(const char *name) |
2727692a | 312 | { |
c928825d | 313 | int ret; |
314 | char ctlfname[PATH_MAX]; | |
315 | ||
316 | if (!name) { | |
317 | fprintf(stderr, "%s: args invalid\n", __func__); | |
318 | ret = -EINVAL; | |
319 | goto arg_error; | |
320 | } | |
321 | ||
322 | ret = lttctl_check_trace(name, 1); | |
323 | if (ret) | |
324 | goto arg_error; | |
325 | ||
326 | sprintf(ctlfname, "%s/ltt/control/%s/alloc", debugfsmntdir, name); | |
327 | ||
328 | ret = lttctl_sendop(ctlfname, "1"); | |
329 | if (ret) { | |
330 | fprintf(stderr, "Allocate trace failed\n"); | |
331 | goto op_err; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | ||
336 | op_err: | |
337 | arg_error: | |
338 | return ret; | |
339 | } | |
340 | ||
341 | int lttctl_start(const char *name) | |
342 | { | |
343 | int ret; | |
344 | char ctlfname[PATH_MAX]; | |
345 | ||
346 | if (!name) { | |
347 | fprintf(stderr, "%s: args invalid\n", __func__); | |
348 | ret = -EINVAL; | |
349 | goto arg_error; | |
350 | } | |
351 | ||
352 | ret = lttctl_check_trace(name, 1); | |
353 | if (ret) | |
354 | goto arg_error; | |
355 | ||
356 | sprintf(ctlfname, "%s/ltt/control/%s/enabled", debugfsmntdir, name); | |
357 | ||
358 | ret = lttctl_sendop(ctlfname, "1"); | |
359 | if (ret) { | |
360 | fprintf(stderr, "Start trace failed\n"); | |
361 | goto op_err; | |
2727692a | 362 | } |
363 | ||
364 | return 0; | |
365 | ||
c928825d | 366 | op_err: |
367 | arg_error: | |
368 | return ret; | |
2727692a | 369 | } |
370 | ||
c928825d | 371 | int lttctl_pause(const char *name) |
2727692a | 372 | { |
c928825d | 373 | int ret; |
374 | char ctlfname[PATH_MAX]; | |
375 | ||
376 | if (!name) { | |
377 | fprintf(stderr, "%s: args invalid\n", __func__); | |
378 | ret = -EINVAL; | |
379 | goto arg_error; | |
380 | } | |
381 | ||
382 | ret = lttctl_check_trace(name, 1); | |
383 | if (ret) | |
384 | goto arg_error; | |
385 | ||
386 | sprintf(ctlfname, "%s/ltt/control/%s/enabled", debugfsmntdir, name); | |
387 | ||
388 | ret = lttctl_sendop(ctlfname, "0"); | |
389 | if (ret) { | |
390 | fprintf(stderr, "Pause trace failed\n"); | |
391 | goto op_err; | |
2727692a | 392 | } |
393 | ||
394 | return 0; | |
395 | ||
c928825d | 396 | op_err: |
397 | arg_error: | |
398 | return ret; | |
399 | } | |
400 | ||
401 | int lttctl_set_trans(const char *name, const char *trans) | |
402 | { | |
403 | int ret; | |
404 | char ctlfname[PATH_MAX]; | |
405 | ||
406 | if (!name) { | |
407 | fprintf(stderr, "%s: args invalid\n", __func__); | |
408 | ret = -EINVAL; | |
409 | goto arg_error; | |
410 | } | |
411 | ||
412 | ret = lttctl_check_trace(name, 1); | |
413 | if (ret) | |
414 | goto arg_error; | |
415 | ||
416 | sprintf(ctlfname, "%s/ltt/control/%s/trans", debugfsmntdir, name); | |
2727692a | 417 | |
c928825d | 418 | ret = lttctl_sendop(ctlfname, trans); |
419 | if (ret) { | |
420 | fprintf(stderr, "Set transport failed\n"); | |
421 | goto op_err; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | ||
426 | op_err: | |
427 | arg_error: | |
428 | return ret; | |
2727692a | 429 | } |
430 | ||
c928825d | 431 | static int __lttctl_set_channel_enable(const char *name, const char *channel, |
432 | int enable) | |
2727692a | 433 | { |
c928825d | 434 | int ret; |
435 | char ctlfname[PATH_MAX]; | |
2727692a | 436 | |
c928825d | 437 | sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/enable", debugfsmntdir, |
438 | name, channel); | |
2727692a | 439 | |
c928825d | 440 | ret = lttctl_sendop(ctlfname, enable ? "1" : "0"); |
441 | if (ret) | |
442 | fprintf(stderr, "Set channel's enable mode failed\n"); | |
2727692a | 443 | |
c928825d | 444 | return ret; |
445 | } | |
446 | int lttctl_set_channel_enable(const char *name, const char *channel, | |
447 | int enable) | |
448 | { | |
449 | int ret; | |
4015ea80 | 450 | char **channellist; |
451 | int n_channel; | |
2727692a | 452 | |
c928825d | 453 | if (!name || !channel) { |
454 | fprintf(stderr, "%s: args invalid\n", __func__); | |
455 | ret = -EINVAL; | |
456 | goto arg_error; | |
457 | } | |
2727692a | 458 | |
c928825d | 459 | ret = lttctl_check_trace(name, 1); |
460 | if (ret) | |
461 | goto arg_error; | |
462 | ||
463 | if (strcmp(channel, "all")) { | |
464 | ret = __lttctl_set_channel_enable(name, channel, enable); | |
465 | if (ret) | |
466 | goto op_err; | |
467 | } else { | |
c928825d | 468 | /* Don't allow set enable state for metadata channel */ |
469 | n_channel = lttctl_get_channellist(name, &channellist, 0); | |
470 | if (n_channel < 0) { | |
471 | fprintf(stderr, "%s: lttctl_get_channellist failed\n", | |
472 | __func__); | |
473 | ret = -ENOENT; | |
474 | goto op_err; | |
475 | } | |
2727692a | 476 | |
c928825d | 477 | for (; n_channel > 0; n_channel--) { |
478 | ret = __lttctl_set_channel_enable(name, | |
479 | channellist[n_channel - 1], enable); | |
480 | if (ret) | |
4015ea80 | 481 | goto op_err_clean; |
c928825d | 482 | } |
4015ea80 | 483 | lttctl_free_channellist(channellist, n_channel); |
2727692a | 484 | } |
485 | ||
486 | return 0; | |
487 | ||
4015ea80 | 488 | op_err_clean: |
489 | lttctl_free_channellist(channellist, n_channel); | |
c928825d | 490 | op_err: |
491 | arg_error: | |
492 | return ret; | |
493 | } | |
494 | ||
495 | static int __lttctl_set_channel_overwrite(const char *name, const char *channel, | |
496 | int overwrite) | |
497 | { | |
498 | int ret; | |
499 | char ctlfname[PATH_MAX]; | |
500 | ||
501 | sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/overwrite", | |
502 | debugfsmntdir, name, channel); | |
503 | ||
504 | ret = lttctl_sendop(ctlfname, overwrite ? "1" : "0"); | |
505 | if (ret) | |
506 | fprintf(stderr, "Set channel's overwrite mode failed\n"); | |
507 | ||
508 | return ret; | |
509 | } | |
510 | int lttctl_set_channel_overwrite(const char *name, const char *channel, | |
511 | int overwrite) | |
512 | { | |
513 | int ret; | |
4015ea80 | 514 | char **channellist; |
515 | int n_channel; | |
c928825d | 516 | |
517 | if (!name || !channel) { | |
518 | fprintf(stderr, "%s: args invalid\n", __func__); | |
519 | ret = -EINVAL; | |
520 | goto arg_error; | |
521 | } | |
522 | ||
523 | ret = lttctl_check_trace(name, 1); | |
524 | if (ret) | |
525 | goto arg_error; | |
526 | ||
527 | if (strcmp(channel, "all")) { | |
528 | ret = __lttctl_set_channel_overwrite(name, channel, overwrite); | |
529 | if (ret) | |
530 | goto op_err; | |
531 | } else { | |
c928825d | 532 | /* Don't allow set overwrite for metadata channel */ |
533 | n_channel = lttctl_get_channellist(name, &channellist, 0); | |
534 | if (n_channel < 0) { | |
535 | fprintf(stderr, "%s: lttctl_get_channellist failed\n", | |
536 | __func__); | |
537 | ret = -ENOENT; | |
538 | goto op_err; | |
539 | } | |
540 | ||
541 | for (; n_channel > 0; n_channel--) { | |
542 | ret = __lttctl_set_channel_overwrite(name, | |
543 | channellist[n_channel - 1], overwrite); | |
544 | if (ret) | |
4015ea80 | 545 | goto op_err_clean; |
c928825d | 546 | } |
4015ea80 | 547 | lttctl_free_channellist(channellist, n_channel); |
c928825d | 548 | } |
549 | ||
550 | return 0; | |
2727692a | 551 | |
4015ea80 | 552 | op_err_clean: |
553 | lttctl_free_channellist(channellist, n_channel); | |
c928825d | 554 | op_err: |
555 | arg_error: | |
556 | return ret; | |
2727692a | 557 | } |
558 | ||
c928825d | 559 | static int __lttctl_set_channel_subbuf_num(const char *name, |
560 | const char *channel, unsigned subbuf_num) | |
561 | { | |
562 | int ret; | |
563 | char ctlfname[PATH_MAX]; | |
564 | char opstr[32]; | |
565 | ||
566 | sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/subbuf_num", | |
567 | debugfsmntdir, name, channel); | |
568 | ||
569 | sprintf(opstr, "%u", subbuf_num); | |
570 | ||
571 | ret = lttctl_sendop(ctlfname, opstr); | |
572 | if (ret) | |
573 | fprintf(stderr, "Set channel's subbuf number failed\n"); | |
574 | ||
575 | return ret; | |
576 | } | |
577 | int lttctl_set_channel_subbuf_num(const char *name, const char *channel, | |
578 | unsigned subbuf_num) | |
2727692a | 579 | { |
c928825d | 580 | int ret; |
4015ea80 | 581 | char **channellist; |
582 | int n_channel; | |
c928825d | 583 | |
584 | if (!name || !channel) { | |
585 | fprintf(stderr, "%s: args invalid\n", __func__); | |
586 | ret = -EINVAL; | |
587 | goto arg_error; | |
588 | } | |
589 | ||
590 | ret = lttctl_check_trace(name, 1); | |
591 | if (ret) | |
592 | goto arg_error; | |
593 | ||
594 | if (strcmp(channel, "all")) { | |
595 | ret = __lttctl_set_channel_subbuf_num(name, channel, | |
596 | subbuf_num); | |
597 | if (ret) | |
598 | goto op_err; | |
599 | } else { | |
c928825d | 600 | /* allow set subbuf_num for metadata channel */ |
601 | n_channel = lttctl_get_channellist(name, &channellist, 1); | |
602 | if (n_channel < 0) { | |
603 | fprintf(stderr, "%s: lttctl_get_channellist failed\n", | |
604 | __func__); | |
605 | ret = -ENOENT; | |
606 | goto op_err; | |
607 | } | |
608 | ||
609 | for (; n_channel > 0; n_channel--) { | |
610 | ret = __lttctl_set_channel_subbuf_num(name, | |
611 | channellist[n_channel - 1], subbuf_num); | |
612 | if (ret) | |
4015ea80 | 613 | goto op_err_clean; |
c928825d | 614 | } |
4015ea80 | 615 | lttctl_free_channellist(channellist, n_channel); |
2727692a | 616 | } |
617 | ||
618 | return 0; | |
619 | ||
4015ea80 | 620 | op_err_clean: |
621 | lttctl_free_channellist(channellist, n_channel); | |
c928825d | 622 | op_err: |
623 | arg_error: | |
624 | return ret; | |
625 | } | |
626 | ||
627 | static int __lttctl_set_channel_subbuf_size(const char *name, | |
628 | const char *channel, unsigned subbuf_size) | |
629 | { | |
630 | int ret; | |
631 | char ctlfname[PATH_MAX]; | |
632 | char opstr[32]; | |
633 | ||
634 | sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/subbuf_size", | |
635 | debugfsmntdir, name, channel); | |
636 | ||
637 | sprintf(opstr, "%u", subbuf_size); | |
638 | ||
639 | ret = lttctl_sendop(ctlfname, opstr); | |
640 | if (ret) | |
641 | fprintf(stderr, "Set channel's subbuf size failed\n"); | |
2727692a | 642 | } |
8d5607b4 | 643 | |
c928825d | 644 | int lttctl_set_channel_subbuf_size(const char *name, const char *channel, |
645 | unsigned subbuf_size) | |
646 | { | |
647 | int ret; | |
4015ea80 | 648 | char **channellist; |
649 | int n_channel; | |
2727692a | 650 | |
c928825d | 651 | if (!name || !channel) { |
652 | fprintf(stderr, "%s: args invalid\n", __func__); | |
653 | ret = -EINVAL; | |
654 | goto arg_error; | |
655 | } | |
656 | ||
657 | ret = lttctl_check_trace(name, 1); | |
658 | if (ret) | |
659 | goto arg_error; | |
660 | ||
661 | if (strcmp(channel, "all")) { | |
662 | ret = __lttctl_set_channel_subbuf_size(name, channel, | |
663 | subbuf_size); | |
664 | if (ret) | |
665 | goto op_err; | |
666 | } else { | |
c928825d | 667 | /* allow set subbuf_size for metadata channel */ |
668 | n_channel = lttctl_get_channellist(name, &channellist, 1); | |
669 | if (n_channel < 0) { | |
670 | fprintf(stderr, "%s: lttctl_get_channellist failed\n", | |
671 | __func__); | |
672 | ret = -ENOENT; | |
673 | goto op_err; | |
674 | } | |
675 | ||
676 | for (; n_channel > 0; n_channel--) { | |
677 | ret = __lttctl_set_channel_subbuf_size(name, | |
678 | channellist[n_channel - 1], subbuf_size); | |
679 | if (ret) | |
4015ea80 | 680 | goto op_err_clean; |
c928825d | 681 | } |
4015ea80 | 682 | lttctl_free_channellist(channellist, n_channel); |
c928825d | 683 | } |
684 | ||
685 | return 0; | |
686 | ||
4015ea80 | 687 | op_err_clean: |
688 | lttctl_free_channellist(channellist, n_channel); | |
c928825d | 689 | op_err: |
690 | arg_error: | |
691 | return ret; | |
692 | } | |
354b34fd | 693 | |
8d5607b4 MD |
694 | static int __lttctl_set_channel_switch_timer(const char *name, |
695 | const char *channel, unsigned switch_timer) | |
696 | { | |
697 | int ret; | |
698 | char ctlfname[PATH_MAX]; | |
699 | char opstr[32]; | |
700 | ||
701 | sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/switch_timer", | |
702 | debugfsmntdir, name, channel); | |
703 | ||
704 | sprintf(opstr, "%u", switch_timer); | |
705 | ||
706 | ret = lttctl_sendop(ctlfname, opstr); | |
707 | if (ret) | |
708 | fprintf(stderr, "Set channel's switch timer failed\n"); | |
709 | } | |
710 | ||
711 | int lttctl_set_channel_switch_timer(const char *name, const char *channel, | |
712 | unsigned switch_timer) | |
713 | { | |
714 | int ret; | |
715 | char **channellist; | |
716 | int n_channel; | |
717 | ||
718 | if (!name || !channel) { | |
719 | fprintf(stderr, "%s: args invalid\n", __func__); | |
720 | ret = -EINVAL; | |
721 | goto arg_error; | |
722 | } | |
723 | ||
724 | ret = lttctl_check_trace(name, 1); | |
725 | if (ret) | |
726 | goto arg_error; | |
727 | ||
728 | if (strcmp(channel, "all")) { | |
729 | ret = __lttctl_set_channel_subbuf_size(name, channel, | |
730 | switch_timer); | |
731 | if (ret) | |
732 | goto op_err; | |
733 | } else { | |
734 | /* allow set subbuf_size for metadata channel */ | |
735 | n_channel = lttctl_get_channellist(name, &channellist, 1); | |
736 | if (n_channel < 0) { | |
737 | fprintf(stderr, "%s: lttctl_get_channellist failed\n", | |
738 | __func__); | |
739 | ret = -ENOENT; | |
740 | goto op_err; | |
741 | } | |
742 | ||
743 | for (; n_channel > 0; n_channel--) { | |
744 | ret = __lttctl_set_channel_switch_timer(name, | |
745 | channellist[n_channel - 1], switch_timer); | |
746 | if (ret) | |
747 | goto op_err_clean; | |
748 | } | |
749 | lttctl_free_channellist(channellist, n_channel); | |
750 | } | |
751 | ||
752 | return 0; | |
753 | ||
754 | op_err_clean: | |
755 | lttctl_free_channellist(channellist, n_channel); | |
756 | op_err: | |
757 | arg_error: | |
758 | return ret; | |
759 | } | |
760 | ||
354b34fd | 761 | int getdebugfsmntdir(char *mntdir) |
762 | { | |
763 | char mnt_dir[PATH_MAX]; | |
764 | char mnt_type[PATH_MAX]; | |
765 | int trymount_done = 0; | |
766 | ||
767 | FILE *fp = fopen("/proc/mounts", "r"); | |
768 | if (!fp) | |
769 | return -EINVAL; | |
770 | ||
771 | find_again: | |
772 | while (1) { | |
773 | if (fscanf(fp, "%*s %s %s %*s %*s %*s", mnt_dir, mnt_type) <= 0) | |
774 | break; | |
775 | ||
776 | if (!strcmp(mnt_type, "debugfs")) { | |
777 | strcpy(mntdir, mnt_dir); | |
778 | return 0; | |
779 | } | |
780 | } | |
781 | ||
782 | if (!trymount_done) { | |
783 | mount("debugfs", "/sys/kernel/debug/", "debugfs", 0, NULL); | |
784 | trymount_done = 1; | |
785 | goto find_again; | |
786 | } | |
787 | ||
788 | return -ENOENT; | |
789 | } |