SoW-2020-0002: Trace Hit Counters: trigger error reporting integration
[lttng-tools.git] / src / common / kernel-ctl / kernel-ctl.c
1 /*
2 * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0-only
7 *
8 */
9
10 #include "lttng/tracker.h"
11 #define _LGPL_SOURCE
12 #define __USE_LINUX_IOCTL_DEFS
13 #include <sys/ioctl.h>
14 #include <string.h>
15 #include <common/align.h>
16 #include <common/macros.h>
17 #include <errno.h>
18 #include <stdarg.h>
19 #include <assert.h>
20 #include <common/time.h>
21
22 #include "kernel-ctl.h"
23 #include "kernel-ioctl.h"
24
25 #define LTTNG_IOCTL_CHECK(fildes, request, ...) ({ \
26 int ret = ioctl(fildes, request, ##__VA_ARGS__);\
27 assert(ret <= 0); \
28 !ret ? 0 : -errno; \
29 })
30
31 #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({ \
32 int ret = ioctl(fildes, request, ##__VA_ARGS__);\
33 ret >= 0 ? ret : -errno; \
34 })
35
36 /*
37 * This flag indicates which version of the kernel ABI to use. The old
38 * ABI (namespace _old) does not support a 32-bit user-space when the
39 * kernel is 64-bit. The old ABI is kept here for compatibility but is
40 * deprecated and will be removed eventually.
41 */
42 static int lttng_kernel_use_old_abi = -1;
43
44 /*
45 * Execute the new or old ioctl depending on the ABI version.
46 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
47 * this function tests if the new ABI is available and otherwise fallbacks
48 * on the old one.
49 * This function takes the fd on which the ioctl must be executed and the old
50 * and new request codes.
51 * It returns the return value of the ioctl executed.
52 */
53 static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
54 unsigned long newname)
55 {
56 int ret;
57
58 if (lttng_kernel_use_old_abi == -1) {
59 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
60 if (!ret) {
61 lttng_kernel_use_old_abi = 0;
62 goto end;
63 }
64 lttng_kernel_use_old_abi = 1;
65 }
66 if (lttng_kernel_use_old_abi) {
67 ret = LTTNG_IOCTL_NO_CHECK(fd, oldname);
68 } else {
69 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
70 }
71
72 end:
73 return ret;
74 }
75
76 int kernctl_create_session(int fd)
77 {
78 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
79 LTTNG_KERNEL_SESSION);
80 }
81
82 /* open the metadata global channel */
83 int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
84 {
85 struct lttng_kernel_channel channel;
86
87 if (lttng_kernel_use_old_abi) {
88 struct lttng_kernel_old_channel old_channel;
89
90 memset(&old_channel, 0, sizeof(old_channel));
91 old_channel.overwrite = chops->overwrite;
92 old_channel.subbuf_size = chops->subbuf_size;
93 old_channel.num_subbuf = chops->num_subbuf;
94 old_channel.switch_timer_interval = chops->switch_timer_interval;
95 old_channel.read_timer_interval = chops->read_timer_interval;
96 old_channel.output = chops->output;
97
98 memset(old_channel.padding, 0, sizeof(old_channel.padding));
99 /*
100 * The new channel padding is smaller than the old ABI so we use the
101 * new ABI padding size for the memcpy.
102 */
103 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
104
105 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_METADATA,
106 &old_channel);
107 }
108
109 memset(&channel, 0, sizeof(channel));
110 channel.overwrite = chops->overwrite;
111 channel.subbuf_size = chops->subbuf_size;
112 channel.num_subbuf = chops->num_subbuf;
113 channel.switch_timer_interval = chops->switch_timer_interval;
114 channel.read_timer_interval = chops->read_timer_interval;
115 channel.output = chops->output;
116 memcpy(channel.padding, chops->padding, sizeof(chops->padding));
117
118 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_METADATA, &channel);
119 }
120
121 int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
122 {
123 struct lttng_kernel_channel channel;
124
125 memset(&channel, 0, sizeof(channel));
126 if (lttng_kernel_use_old_abi) {
127 struct lttng_kernel_old_channel old_channel;
128
129 old_channel.overwrite = chops->overwrite;
130 old_channel.subbuf_size = chops->subbuf_size;
131 old_channel.num_subbuf = chops->num_subbuf;
132 old_channel.switch_timer_interval = chops->switch_timer_interval;
133 old_channel.read_timer_interval = chops->read_timer_interval;
134 old_channel.output = chops->output;
135
136 memset(old_channel.padding, 0, sizeof(old_channel.padding));
137 /*
138 * The new channel padding is smaller than the old ABI so we use the
139 * new ABI padding size for the memcpy.
140 */
141 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
142
143 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_CHANNEL,
144 &old_channel);
145 }
146
147 channel.overwrite = chops->overwrite;
148 channel.subbuf_size = chops->subbuf_size;
149 channel.num_subbuf = chops->num_subbuf;
150 channel.switch_timer_interval = chops->switch_timer_interval;
151 channel.read_timer_interval = chops->read_timer_interval;
152 channel.output = chops->output;
153 memcpy(channel.padding, chops->padding, sizeof(chops->padding));
154
155 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel);
156 }
157
158 int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
159 {
160 struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
161 size_t array_alloc_len;
162 char *new_mask;
163 int ret = 0;
164
165 if (!syscall_mask) {
166 ret = -1;
167 goto end;
168 }
169
170 if (!nr_bits) {
171 ret = -1;
172 goto end;
173 }
174
175 kmask_len.len = 0;
176 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
177 if (ret) {
178 goto end;
179 }
180
181 array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
182
183 kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
184 if (!kmask) {
185 ret = -1;
186 goto end;
187 }
188
189 kmask->len = kmask_len.len;
190 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
191 if (ret) {
192 goto end;
193 }
194
195 new_mask = realloc(*syscall_mask, array_alloc_len);
196 if (!new_mask) {
197 ret = -1;
198 goto end;
199 }
200 memcpy(new_mask, kmask->mask, array_alloc_len);
201 *syscall_mask = new_mask;
202 *nr_bits = kmask->len;
203
204 end:
205 free(kmask);
206 return ret;
207 }
208
209 int kernctl_track_pid(int fd, int pid)
210 {
211 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid);
212 }
213
214 int kernctl_untrack_pid(int fd, int pid)
215 {
216 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid);
217 }
218
219 int kernctl_list_tracker_pids(int fd)
220 {
221 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS);
222 }
223
224 static enum lttng_kernel_tracker_type get_kernel_tracker_type(
225 enum lttng_process_attr process_attr)
226 {
227 switch (process_attr) {
228 case LTTNG_PROCESS_ATTR_PROCESS_ID:
229 return LTTNG_KERNEL_TRACKER_PID;
230 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
231 return LTTNG_KERNEL_TRACKER_VPID;
232 case LTTNG_PROCESS_ATTR_USER_ID:
233 return LTTNG_KERNEL_TRACKER_UID;
234 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
235 return LTTNG_KERNEL_TRACKER_VUID;
236 case LTTNG_PROCESS_ATTR_GROUP_ID:
237 return LTTNG_KERNEL_TRACKER_GID;
238 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
239 return LTTNG_KERNEL_TRACKER_VGID;
240 default:
241 return LTTNG_KERNEL_TRACKER_UNKNOWN;
242 }
243 }
244
245 int kernctl_track_id(int fd, enum lttng_process_attr process_attr, int id)
246 {
247 struct lttng_kernel_tracker_args args;
248
249 args.id = id;
250 args.type = get_kernel_tracker_type(process_attr);
251 if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
252 errno = EINVAL;
253 return -1;
254 }
255 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_ID, &args);
256 }
257
258 int kernctl_untrack_id(int fd, enum lttng_process_attr process_attr, int id)
259 {
260 struct lttng_kernel_tracker_args args;
261
262 args.id = id;
263 args.type = get_kernel_tracker_type(process_attr);
264 if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
265 errno = EINVAL;
266 return -1;
267 }
268 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_ID, &args);
269 }
270
271 int kernctl_list_tracker_ids(int fd, enum lttng_process_attr process_attr)
272 {
273 struct lttng_kernel_tracker_args args;
274
275 args.id = -1;
276 args.type = get_kernel_tracker_type(process_attr);
277 if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
278 errno = EINVAL;
279 return -1;
280 }
281 return LTTNG_IOCTL_NO_CHECK(
282 fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS, &args);
283 }
284
285 int kernctl_session_regenerate_metadata(int fd)
286 {
287 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_METADATA_REGEN);
288 }
289
290 int kernctl_session_regenerate_statedump(int fd)
291 {
292 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_STATEDUMP);
293 }
294
295 int kernctl_session_set_name(int fd, const char *name)
296 {
297 int ret;
298 struct lttng_kernel_session_name session_name;
299
300 ret = lttng_strncpy(session_name.name, name, sizeof(session_name.name));
301 if (ret) {
302 goto end;
303 }
304
305 ret = LTTNG_IOCTL_CHECK(
306 fd, LTTNG_KERNEL_SESSION_SET_NAME, &session_name);
307 end:
308 return ret;
309 }
310
311 int kernctl_session_set_creation_time(int fd, time_t time)
312 {
313 int ret;
314 struct lttng_kernel_session_creation_time creation_time;
315
316 ret = time_to_iso8601_str(time, creation_time.iso8601,
317 sizeof(creation_time.iso8601));
318 if (ret) {
319 goto end;
320 }
321
322 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_SET_CREATION_TIME,
323 &creation_time);
324 end:
325 return ret;
326 }
327
328 int kernctl_create_stream(int fd)
329 {
330 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
331 LTTNG_KERNEL_STREAM);
332 }
333
334 int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
335 {
336 if (lttng_kernel_use_old_abi) {
337 struct lttng_kernel_old_event old_event;
338
339 memset(&old_event, 0, sizeof(old_event));
340 memcpy(old_event.name, ev->name, sizeof(old_event.name));
341 old_event.instrumentation = ev->instrumentation;
342 switch (ev->instrumentation) {
343 case LTTNG_KERNEL_KPROBE:
344 old_event.u.kprobe.addr = ev->u.kprobe.addr;
345 old_event.u.kprobe.offset = ev->u.kprobe.offset;
346 memcpy(old_event.u.kprobe.symbol_name,
347 ev->u.kprobe.symbol_name,
348 sizeof(old_event.u.kprobe.symbol_name));
349 break;
350 case LTTNG_KERNEL_KRETPROBE:
351 old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
352 old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
353 memcpy(old_event.u.kretprobe.symbol_name,
354 ev->u.kretprobe.symbol_name,
355 sizeof(old_event.u.kretprobe.symbol_name));
356 break;
357 case LTTNG_KERNEL_FUNCTION:
358 memcpy(old_event.u.ftrace.symbol_name,
359 ev->u.ftrace.symbol_name,
360 sizeof(old_event.u.ftrace.symbol_name));
361 break;
362 default:
363 break;
364 }
365
366 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_EVENT,
367 &old_event);
368 }
369 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_EVENT, ev);
370 }
371
372 int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
373 {
374 if (lttng_kernel_use_old_abi) {
375 struct lttng_kernel_old_context old_ctx;
376
377 memset(&old_ctx, 0, sizeof(old_ctx));
378 old_ctx.ctx = ctx->ctx;
379 /* only type that uses the union */
380 if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
381 old_ctx.u.perf_counter.type =
382 ctx->u.perf_counter.type;
383 old_ctx.u.perf_counter.config =
384 ctx->u.perf_counter.config;
385 memcpy(old_ctx.u.perf_counter.name,
386 ctx->u.perf_counter.name,
387 sizeof(old_ctx.u.perf_counter.name));
388 }
389 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
390 }
391 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CONTEXT, ctx);
392 }
393
394
395 /* Enable event, channel and session LTTNG_IOCTL_CHECK */
396 int kernctl_enable(int fd)
397 {
398 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
399 LTTNG_KERNEL_ENABLE);
400 }
401
402 /* Disable event, channel and session LTTNG_IOCTL_CHECK */
403 int kernctl_disable(int fd)
404 {
405 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
406 LTTNG_KERNEL_DISABLE);
407 }
408
409 int kernctl_start_session(int fd)
410 {
411 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
412 LTTNG_KERNEL_SESSION_START);
413 }
414
415 int kernctl_stop_session(int fd)
416 {
417 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
418 LTTNG_KERNEL_SESSION_STOP);
419 }
420
421 int kernctl_create_trigger_group(int fd)
422 {
423 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_TRIGGER_GROUP_CREATE);
424 }
425
426 int kernctl_create_trigger_group_notification_fd(int group_fd)
427 {
428 return LTTNG_IOCTL_NO_CHECK(group_fd, LTTNG_KERNEL_TRIGGER_GROUP_NOTIFICATION_FD);
429 }
430
431 int kernctl_create_trigger_group_error_counter(int group_fd, struct lttng_kernel_counter_conf *error_counter_conf)
432 {
433 return LTTNG_IOCTL_NO_CHECK(group_fd, LTTNG_KERNEL_COUNTER, error_counter_conf);
434 }
435
436 int kernctl_counter_get_value(int counter_fd, struct lttng_kernel_counter_value *value)
437 {
438 return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_COUNTER_VALUE, value);
439 }
440
441 int kernctl_create_trigger(int group_fd, struct lttng_kernel_trigger *trigger)
442 {
443 return LTTNG_IOCTL_NO_CHECK(group_fd, LTTNG_KERNEL_TRIGGER_CREATE, trigger);
444 }
445
446 int kernctl_capture(int fd, const struct lttng_bytecode *capture)
447 {
448 struct lttng_kernel_capture_bytecode *kb;
449 uint32_t len;
450 int ret;
451
452 /* Translate bytecode to kernel bytecode */
453 kb = zmalloc(sizeof(*kb) + capture->len);
454 if (!kb)
455 return -ENOMEM;
456 kb->len = len = capture->len;
457 kb->reloc_offset = capture->reloc_table_offset;
458 kb->seqnum = capture->seqnum;
459 memcpy(kb->data, capture->data, len);
460 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CAPTURE, kb);
461 free(kb);
462 return ret;
463 }
464
465 int kernctl_filter(int fd, const struct lttng_bytecode *filter)
466 {
467 struct lttng_kernel_filter_bytecode *kb;
468 uint32_t len;
469 int ret;
470
471 /* Translate bytecode to kernel bytecode */
472 kb = zmalloc(sizeof(*kb) + filter->len);
473 if (!kb)
474 return -ENOMEM;
475 kb->len = len = filter->len;
476 kb->reloc_offset = filter->reloc_table_offset;
477 kb->seqnum = filter->seqnum;
478 memcpy(kb->data, filter->data, len);
479 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_FILTER, kb);
480 free(kb);
481 return ret;
482 }
483
484 int kernctl_add_callsite(int fd, struct lttng_kernel_event_callsite *callsite)
485 {
486 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ADD_CALLSITE, callsite);
487 }
488
489 int kernctl_tracepoint_list(int fd)
490 {
491 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
492 LTTNG_KERNEL_TRACEPOINT_LIST);
493 }
494
495 int kernctl_syscall_list(int fd)
496 {
497 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SYSCALL_LIST);
498 }
499
500 int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
501 {
502 int ret;
503
504 if (lttng_kernel_use_old_abi == -1) {
505 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
506 if (!ret) {
507 lttng_kernel_use_old_abi = 0;
508 goto end;
509 }
510 lttng_kernel_use_old_abi = 1;
511 }
512 if (lttng_kernel_use_old_abi) {
513 struct lttng_kernel_old_tracer_version old_v;
514
515 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
516 if (ret) {
517 goto end;
518 }
519 v->major = old_v.major;
520 v->minor = old_v.minor;
521 v->patchlevel = old_v.patchlevel;
522 } else {
523 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
524 }
525
526 end:
527 return ret;
528 }
529
530 int kernctl_tracer_abi_version(int fd,
531 struct lttng_kernel_tracer_abi_version *v)
532 {
533 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v);
534 }
535
536 int kernctl_wait_quiescent(int fd)
537 {
538 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
539 LTTNG_KERNEL_WAIT_QUIESCENT);
540 }
541
542 int kernctl_buffer_flush(int fd)
543 {
544 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH);
545 }
546
547 int kernctl_buffer_flush_empty(int fd)
548 {
549 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH_EMPTY);
550 }
551
552 int kernctl_buffer_clear(int fd)
553 {
554 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_CLEAR);
555 }
556
557 int kernctl_get_next_subbuf_metadata_check(int fd, bool *consistent)
558 {
559 return LTTNG_IOCTL_NO_CHECK(fd,
560 RING_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK,
561 consistent);
562 }
563
564 /* returns the version of the metadata. */
565 int kernctl_get_metadata_version(int fd, uint64_t *version)
566 {
567 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_METADATA_VERSION, version);
568 }
569
570 int kernctl_metadata_cache_dump(int fd)
571 {
572 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_METADATA_CACHE_DUMP);
573 }
574
575 /* Buffer operations */
576
577 /* For mmap mode, readable without "get" operation */
578
579 /* returns the length to mmap. */
580 int kernctl_get_mmap_len(int fd, unsigned long *len)
581 {
582 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_LEN, len);
583 }
584
585 /* returns the maximum size for sub-buffers. */
586 int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
587 {
588 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
589 }
590
591 /*
592 * For mmap mode, operate on the current packet (between get/put or
593 * get_next/put_next).
594 */
595
596 /* returns the offset of the subbuffer belonging to the mmap reader. */
597 int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
598 {
599 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
600 }
601
602 /* returns the size of the current sub-buffer, without padding (for mmap). */
603 int kernctl_get_subbuf_size(int fd, unsigned long *len)
604 {
605 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
606 }
607
608 /* returns the size of the current sub-buffer, without padding (for mmap). */
609 int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
610 {
611 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
612 }
613
614 /* Get exclusive read access to the next sub-buffer that can be read. */
615 int kernctl_get_next_subbuf(int fd)
616 {
617 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_NEXT_SUBBUF);
618 }
619
620
621 /* Release exclusive sub-buffer access, move consumer forward. */
622 int kernctl_put_next_subbuf(int fd)
623 {
624 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
625 }
626
627 /* snapshot */
628
629 /* Get a snapshot of the current ring buffer producer and consumer positions */
630 int kernctl_snapshot(int fd)
631 {
632 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT);
633 }
634
635 /*
636 * Get a snapshot of the current ring buffer producer and consumer positions,
637 * regardless of whether or not the two positions are contained within the
638 * same sub-buffer.
639 */
640 int kernctl_snapshot_sample_positions(int fd)
641 {
642 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS);
643 }
644
645 /* Get the consumer position (iteration start) */
646 int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
647 {
648 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
649 }
650
651 /* Get the producer position (iteration end) */
652 int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
653 {
654 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
655 }
656
657 /* Get exclusive read access to the specified sub-buffer position */
658 int kernctl_get_subbuf(int fd, unsigned long *len)
659 {
660 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF, len);
661 }
662
663 /* Release exclusive sub-buffer access */
664 int kernctl_put_subbuf(int fd)
665 {
666 return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_SUBBUF);
667 }
668
669 /* Returns the timestamp begin of the current sub-buffer. */
670 int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
671 {
672 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN,
673 timestamp_begin);
674 }
675
676 /* Returns the timestamp end of the current sub-buffer. */
677 int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
678 {
679 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END,
680 timestamp_end);
681 }
682
683 /* Returns the number of discarded events in the current sub-buffer. */
684 int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
685 {
686 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED,
687 events_discarded);
688 }
689
690 /* Returns the content size in the current sub-buffer. */
691 int kernctl_get_content_size(int fd, uint64_t *content_size)
692 {
693 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE,
694 content_size);
695 }
696
697 /* Returns the packet size in the current sub-buffer. */
698 int kernctl_get_packet_size(int fd, uint64_t *packet_size)
699 {
700 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE,
701 packet_size);
702 }
703
704 /* Returns the stream id of the current sub-buffer. */
705 int kernctl_get_stream_id(int fd, uint64_t *stream_id)
706 {
707 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_STREAM_ID,
708 stream_id);
709 }
710
711 /* Returns the current timestamp. */
712 int kernctl_get_current_timestamp(int fd, uint64_t *ts)
713 {
714 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP,
715 ts);
716 }
717
718 /* Returns the packet sequence number of the current sub-buffer. */
719 int kernctl_get_sequence_number(int fd, uint64_t *seq)
720 {
721 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_SEQ_NUM, seq);
722 }
723
724 /* Returns the stream instance id. */
725 int kernctl_get_instance_id(int fd, uint64_t *id)
726 {
727 return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_INSTANCE_ID, id);
728 }
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