Fix: leak on error in lttng-crash
[lttng-tools.git] / src / common / kernel-ctl / kernel-ctl.c
CommitLineData
ee0326c0 1/*
16421f6e
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2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
ee0326c0 4 *
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5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
ee0326c0
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
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14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
ee0326c0 17 */
16421f6e 18
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19#define _GNU_SOURCE
20#define _LGPL_SOURCE
95ba0f2f 21#define __USE_LINUX_IOCTL_DEFS
16421f6e 22#include <sys/ioctl.h>
4dbc372b 23#include <string.h>
46820c8b 24#include <common/align.h>
16421f6e 25
10a8a223 26#include "kernel-ctl.h"
16421f6e 27#include "kernel-ioctl.h"
16421f6e 28
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29/*
30 * This flag indicates which version of the kernel ABI to use. The old
31 * ABI (namespace _old) does not support a 32-bit user-space when the
32 * kernel is 64-bit. The old ABI is kept here for compatibility but is
33 * deprecated and will be removed eventually.
34 */
35static int lttng_kernel_use_old_abi = -1;
36
37/*
38 * Execute the new or old ioctl depending on the ABI version.
39 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
40 * this function tests if the new ABI is available and otherwise fallbacks
41 * on the old one.
42 * This function takes the fd on which the ioctl must be executed and the old
43 * and new request codes.
44 * It returns the return value of the ioctl executed.
45 */
46static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
47 unsigned long newname)
48{
49 int ret;
50
51 if (lttng_kernel_use_old_abi == -1) {
52 ret = ioctl(fd, newname);
53 if (!ret) {
54 lttng_kernel_use_old_abi = 0;
55 goto end;
56 }
57 lttng_kernel_use_old_abi = 1;
58 }
59 if (lttng_kernel_use_old_abi) {
60 ret = ioctl(fd, oldname);
61 } else {
62 ret = ioctl(fd, newname);
63 }
64
65end:
66 return ret;
67}
68
964ccb60 69int kernctl_create_session(int fd)
d65106b1 70{
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71 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
72 LTTNG_KERNEL_SESSION);
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73}
74
964ccb60
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75/* open the metadata global channel */
76int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
f3ed775e 77{
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78 struct lttng_kernel_old_channel old_channel;
79 struct lttng_kernel_channel channel;
80
81 if (lttng_kernel_use_old_abi) {
82 old_channel.overwrite = chops->overwrite;
83 old_channel.subbuf_size = chops->subbuf_size;
84 old_channel.num_subbuf = chops->num_subbuf;
85 old_channel.switch_timer_interval = chops->switch_timer_interval;
86 old_channel.read_timer_interval = chops->read_timer_interval;
87 old_channel.output = chops->output;
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88
89 memset(old_channel.padding, 0, sizeof(old_channel.padding));
90 /*
91 * The new channel padding is smaller than the old ABI so we use the
92 * new ABI padding size for the memcpy.
93 */
94 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
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95
96 return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel);
97 }
98
99 channel.overwrite = chops->overwrite;
100 channel.subbuf_size = chops->subbuf_size;
101 channel.num_subbuf = chops->num_subbuf;
102 channel.switch_timer_interval = chops->switch_timer_interval;
103 channel.read_timer_interval = chops->read_timer_interval;
104 channel.output = chops->output;
ea207e3b 105 memcpy(channel.padding, chops->padding, sizeof(chops->padding));
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106
107 return ioctl(fd, LTTNG_KERNEL_METADATA, &channel);
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108}
109
110int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
16421f6e 111{
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112 struct lttng_kernel_channel channel;
113
114 if (lttng_kernel_use_old_abi) {
115 struct lttng_kernel_old_channel old_channel;
116
117 old_channel.overwrite = chops->overwrite;
118 old_channel.subbuf_size = chops->subbuf_size;
119 old_channel.num_subbuf = chops->num_subbuf;
120 old_channel.switch_timer_interval = chops->switch_timer_interval;
121 old_channel.read_timer_interval = chops->read_timer_interval;
122 old_channel.output = chops->output;
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123
124 memset(old_channel.padding, 0, sizeof(old_channel.padding));
125 /*
126 * The new channel padding is smaller than the old ABI so we use the
127 * new ABI padding size for the memcpy.
128 */
129 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
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130
131 return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel);
132 }
133
134 channel.overwrite = chops->overwrite;
135 channel.subbuf_size = chops->subbuf_size;
136 channel.num_subbuf = chops->num_subbuf;
137 channel.switch_timer_interval = chops->switch_timer_interval;
138 channel.read_timer_interval = chops->read_timer_interval;
139 channel.output = chops->output;
ea207e3b 140 memcpy(channel.padding, chops->padding, sizeof(chops->padding));
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141
142 return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel);
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143}
144
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145int kernctl_enable_syscall(int fd, const char *syscall_name)
146{
147 struct lttng_kernel_event event;
148
149 memset(&event, 0, sizeof(event));
150 strncpy(event.name, syscall_name, sizeof(event.name));
151 event.name[sizeof(event.name) - 1] = '\0';
152 event.instrumentation = LTTNG_KERNEL_SYSCALL;
562ab9a8 153 event.u.syscall.enable = 1;
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154 return ioctl(fd, LTTNG_KERNEL_EVENT, &event);
155}
156
157int kernctl_disable_syscall(int fd, const char *syscall_name)
158{
159 struct lttng_kernel_event event;
160
161 memset(&event, 0, sizeof(event));
162 strncpy(event.name, syscall_name, sizeof(event.name));
163 event.name[sizeof(event.name) - 1] = '\0';
164 event.instrumentation = LTTNG_KERNEL_SYSCALL;
562ab9a8 165 event.u.syscall.enable = 0;
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166 return ioctl(fd, LTTNG_KERNEL_EVENT, &event);
167}
168
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169int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
170{
171 struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
172 size_t array_alloc_len;
173 char *new_mask;
174 int ret = 0;
175
176 if (!syscall_mask) {
177 ret = -1;
178 goto end;
179 }
180
181 if (!nr_bits) {
182 ret = -1;
183 goto end;
184 }
185
186 kmask_len.len = 0;
187 ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
188 if (ret) {
189 goto end;
190 }
191
192 array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
834978fd 193
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194 kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
195 if (!kmask) {
196 ret = -1;
197 goto end;
198 }
199
200 kmask->len = kmask_len.len;
201 ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
202 if (ret) {
203 goto end;
204 }
205
834978fd 206 new_mask = realloc(*syscall_mask, array_alloc_len);
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207 if (!new_mask) {
208 ret = -1;
209 goto end;
210 }
211 memcpy(new_mask, kmask->mask, array_alloc_len);
212 *syscall_mask = new_mask;
213 *nr_bits = kmask->len;
214
215end:
216 free(kmask);
217 return ret;
218}
219
964ccb60 220int kernctl_create_stream(int fd)
16421f6e 221{
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222 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
223 LTTNG_KERNEL_STREAM);
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224}
225
964ccb60 226int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
16421f6e 227{
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228 if (lttng_kernel_use_old_abi) {
229 struct lttng_kernel_old_event old_event;
230
231 memcpy(old_event.name, ev->name, sizeof(old_event.name));
232 old_event.instrumentation = ev->instrumentation;
233 switch (ev->instrumentation) {
234 case LTTNG_KERNEL_KPROBE:
235 old_event.u.kprobe.addr = ev->u.kprobe.addr;
236 old_event.u.kprobe.offset = ev->u.kprobe.offset;
237 memcpy(old_event.u.kprobe.symbol_name,
238 ev->u.kprobe.symbol_name,
239 sizeof(old_event.u.kprobe.symbol_name));
240 break;
241 case LTTNG_KERNEL_KRETPROBE:
242 old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
243 old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
244 memcpy(old_event.u.kretprobe.symbol_name,
245 ev->u.kretprobe.symbol_name,
246 sizeof(old_event.u.kretprobe.symbol_name));
247 break;
248 case LTTNG_KERNEL_FUNCTION:
249 memcpy(old_event.u.ftrace.symbol_name,
250 ev->u.ftrace.symbol_name,
251 sizeof(old_event.u.ftrace.symbol_name));
252 break;
253 default:
254 break;
255 }
256
257 return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event);
258 }
964ccb60 259 return ioctl(fd, LTTNG_KERNEL_EVENT, ev);
16421f6e
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260}
261
964ccb60 262int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
16421f6e 263{
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264 if (lttng_kernel_use_old_abi) {
265 struct lttng_kernel_old_context old_ctx;
266
267 old_ctx.ctx = ctx->ctx;
268 /* only type that uses the union */
aa3514e9 269 if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
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270 old_ctx.u.perf_counter.type =
271 ctx->u.perf_counter.type;
272 old_ctx.u.perf_counter.config =
273 ctx->u.perf_counter.config;
274 memcpy(old_ctx.u.perf_counter.name,
275 ctx->u.perf_counter.name,
276 sizeof(old_ctx.u.perf_counter.name));
277 }
278 return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
279 }
964ccb60 280 return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx);
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281}
282
964ccb60 283
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284/* Enable event, channel and session ioctl */
285int kernctl_enable(int fd)
286{
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287 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
288 LTTNG_KERNEL_ENABLE);
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289}
290
291/* Disable event, channel and session ioctl */
292int kernctl_disable(int fd)
293{
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294 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
295 LTTNG_KERNEL_DISABLE);
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296}
297
964ccb60 298int kernctl_start_session(int fd)
16421f6e 299{
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300 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
301 LTTNG_KERNEL_SESSION_START);
964ccb60
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302}
303
304int kernctl_stop_session(int fd)
305{
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306 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
307 LTTNG_KERNEL_SESSION_STOP);
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308}
309
964ccb60
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310int kernctl_tracepoint_list(int fd)
311{
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312 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
313 LTTNG_KERNEL_TRACEPOINT_LIST);
964ccb60
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314}
315
d02666a9
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316int kernctl_syscall_list(int fd)
317{
318 return ioctl(fd, LTTNG_KERNEL_SYSCALL_LIST);
319}
320
964ccb60
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321int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
322{
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323 int ret;
324
325 if (lttng_kernel_use_old_abi == -1) {
326 ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
327 if (!ret) {
328 lttng_kernel_use_old_abi = 0;
329 goto end;
330 }
331 lttng_kernel_use_old_abi = 1;
332 }
333 if (lttng_kernel_use_old_abi) {
334 struct lttng_kernel_old_tracer_version old_v;
335
336 ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
337 if (ret) {
338 goto end;
339 }
340 v->major = old_v.major;
341 v->minor = old_v.minor;
342 v->patchlevel = old_v.patchlevel;
343 } else {
344 ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
345 }
346
347end:
348 return ret;
964ccb60
MD
349}
350
c052142c
MD
351int kernctl_tracer_abi_version(int fd,
352 struct lttng_kernel_tracer_abi_version *v)
353{
354 return ioctl(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v);
355}
356
964ccb60
MD
357int kernctl_wait_quiescent(int fd)
358{
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359 return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
360 LTTNG_KERNEL_WAIT_QUIESCENT);
964ccb60
MD
361}
362
363int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
364{
4dbc372b
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365 int ret;
366
367 if (lttng_kernel_use_old_abi == -1) {
368 ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
369 if (!ret) {
370 lttng_kernel_use_old_abi = 0;
371 goto end;
372 }
373 lttng_kernel_use_old_abi = 1;
374 }
375 if (lttng_kernel_use_old_abi) {
376 struct lttng_kernel_old_calibrate old_calibrate;
377
378 old_calibrate.type = calibrate->type;
379 ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate);
380 if (ret) {
381 goto end;
382 }
383 calibrate->type = old_calibrate.type;
384 } else {
385 ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
386 }
387
388end:
389 return ret;
964ccb60
MD
390}
391
392
393int kernctl_buffer_flush(int fd)
394{
395 return ioctl(fd, RING_BUFFER_FLUSH);
396}
397
398
399/* Buffer operations */
400
401/* For mmap mode, readable without "get" operation */
402
16421f6e
DG
403/* returns the length to mmap. */
404int kernctl_get_mmap_len(int fd, unsigned long *len)
405{
406 return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len);
407}
408
964ccb60
MD
409/* returns the maximum size for sub-buffers. */
410int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
411{
412 return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
413}
414
415/*
416 * For mmap mode, operate on the current packet (between get/put or
417 * get_next/put_next).
418 */
419
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420/* returns the offset of the subbuffer belonging to the mmap reader. */
421int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
422{
423 return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
424}
425
964ccb60
MD
426/* returns the size of the current sub-buffer, without padding (for mmap). */
427int kernctl_get_subbuf_size(int fd, unsigned long *len)
16421f6e 428{
964ccb60 429 return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
16421f6e
DG
430}
431
432/* returns the size of the current sub-buffer, without padding (for mmap). */
433int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
434{
435 return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
436}
437
964ccb60
MD
438/* Get exclusive read access to the next sub-buffer that can be read. */
439int kernctl_get_next_subbuf(int fd)
16421f6e 440{
964ccb60 441 return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF);
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442}
443
d4a1283e 444
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445/* Release exclusive sub-buffer access, move consumer forward. */
446int kernctl_put_next_subbuf(int fd)
447{
448 return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
449}
450
964ccb60 451/* snapshot */
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452
453/* Get a snapshot of the current ring buffer producer and consumer positions */
454int kernctl_snapshot(int fd)
455{
456 return ioctl(fd, RING_BUFFER_SNAPSHOT);
457}
458
459/* Get the consumer position (iteration start) */
460int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
461{
462 return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
463}
464
465/* Get the producer position (iteration end) */
466int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
467{
468 return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
469}
470
964ccb60
MD
471/* Get exclusive read access to the specified sub-buffer position */
472int kernctl_get_subbuf(int fd, unsigned long *len)
f3ed775e 473{
964ccb60 474 return ioctl(fd, RING_BUFFER_GET_SUBBUF, len);
f3ed775e 475}
d0254c7c 476
964ccb60
MD
477/* Release exclusive sub-buffer access */
478int kernctl_put_subbuf(int fd)
d0254c7c 479{
964ccb60 480 return ioctl(fd, RING_BUFFER_PUT_SUBBUF);
d0254c7c 481}
309167d2
JD
482
483/* Returns the timestamp begin of the current sub-buffer. */
484int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
485{
486 return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN, timestamp_begin);
487}
488
489/* Returns the timestamp end of the current sub-buffer. */
490int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
491{
492 return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END, timestamp_end);
493}
494
495/* Returns the number of discarded events in the current sub-buffer. */
496int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
497{
498 return ioctl(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED, events_discarded);
499}
500
501/* Returns the content size in the current sub-buffer. */
502int kernctl_get_content_size(int fd, uint64_t *content_size)
503{
504 return ioctl(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE, content_size);
505}
506
507/* Returns the packet size in the current sub-buffer. */
508int kernctl_get_packet_size(int fd, uint64_t *packet_size)
509{
510 return ioctl(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE, packet_size);
511}
512
513/* Returns the stream id of the current sub-buffer. */
514int kernctl_get_stream_id(int fd, uint64_t *stream_id)
515{
516 return ioctl(fd, LTTNG_RING_BUFFER_GET_STREAM_ID, stream_id);
517}
d3e2ba59
JD
518
519/* Returns the current timestamp. */
520int kernctl_get_current_timestamp(int fd, uint64_t *ts)
521{
522 return ioctl(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP, ts);
523}
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