Commit | Line | Data |
---|---|---|
ee0326c0 | 1 | /* |
16421f6e DG |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
ee0326c0 | 4 | * |
d14d33bf AM |
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 DG |
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 | * | |
d14d33bf AM |
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 | |
95ba0f2f | 19 | #define __USE_LINUX_IOCTL_DEFS |
16421f6e | 20 | #include <sys/ioctl.h> |
4dbc372b | 21 | #include <string.h> |
46820c8b | 22 | #include <common/align.h> |
16421f6e | 23 | |
10a8a223 | 24 | #include "kernel-ctl.h" |
16421f6e | 25 | #include "kernel-ioctl.h" |
16421f6e | 26 | |
4dbc372b JD |
27 | /* |
28 | * This flag indicates which version of the kernel ABI to use. The old | |
29 | * ABI (namespace _old) does not support a 32-bit user-space when the | |
30 | * kernel is 64-bit. The old ABI is kept here for compatibility but is | |
31 | * deprecated and will be removed eventually. | |
32 | */ | |
33 | static int lttng_kernel_use_old_abi = -1; | |
34 | ||
35 | /* | |
36 | * Execute the new or old ioctl depending on the ABI version. | |
37 | * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1), | |
38 | * this function tests if the new ABI is available and otherwise fallbacks | |
39 | * on the old one. | |
40 | * This function takes the fd on which the ioctl must be executed and the old | |
41 | * and new request codes. | |
42 | * It returns the return value of the ioctl executed. | |
43 | */ | |
44 | static inline int compat_ioctl_no_arg(int fd, unsigned long oldname, | |
45 | unsigned long newname) | |
46 | { | |
47 | int ret; | |
48 | ||
49 | if (lttng_kernel_use_old_abi == -1) { | |
50 | ret = ioctl(fd, newname); | |
51 | if (!ret) { | |
52 | lttng_kernel_use_old_abi = 0; | |
53 | goto end; | |
54 | } | |
55 | lttng_kernel_use_old_abi = 1; | |
56 | } | |
57 | if (lttng_kernel_use_old_abi) { | |
58 | ret = ioctl(fd, oldname); | |
59 | } else { | |
60 | ret = ioctl(fd, newname); | |
61 | } | |
62 | ||
63 | end: | |
64 | return ret; | |
65 | } | |
66 | ||
964ccb60 | 67 | int kernctl_create_session(int fd) |
d65106b1 | 68 | { |
4dbc372b JD |
69 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION, |
70 | LTTNG_KERNEL_SESSION); | |
d65106b1 DG |
71 | } |
72 | ||
964ccb60 MD |
73 | /* open the metadata global channel */ |
74 | int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops) | |
f3ed775e | 75 | { |
4dbc372b JD |
76 | struct lttng_kernel_old_channel old_channel; |
77 | struct lttng_kernel_channel channel; | |
78 | ||
79 | if (lttng_kernel_use_old_abi) { | |
80 | old_channel.overwrite = chops->overwrite; | |
81 | old_channel.subbuf_size = chops->subbuf_size; | |
82 | old_channel.num_subbuf = chops->num_subbuf; | |
83 | old_channel.switch_timer_interval = chops->switch_timer_interval; | |
84 | old_channel.read_timer_interval = chops->read_timer_interval; | |
85 | old_channel.output = chops->output; | |
f853c53a DG |
86 | |
87 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); | |
88 | /* | |
89 | * The new channel padding is smaller than the old ABI so we use the | |
90 | * new ABI padding size for the memcpy. | |
91 | */ | |
92 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); | |
4dbc372b JD |
93 | |
94 | return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel); | |
95 | } | |
96 | ||
97 | channel.overwrite = chops->overwrite; | |
98 | channel.subbuf_size = chops->subbuf_size; | |
99 | channel.num_subbuf = chops->num_subbuf; | |
100 | channel.switch_timer_interval = chops->switch_timer_interval; | |
101 | channel.read_timer_interval = chops->read_timer_interval; | |
102 | channel.output = chops->output; | |
ea207e3b | 103 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
4dbc372b JD |
104 | |
105 | return ioctl(fd, LTTNG_KERNEL_METADATA, &channel); | |
f3ed775e DG |
106 | } |
107 | ||
108 | int kernctl_create_channel(int fd, struct lttng_channel_attr *chops) | |
16421f6e | 109 | { |
4dbc372b JD |
110 | struct lttng_kernel_channel channel; |
111 | ||
112 | if (lttng_kernel_use_old_abi) { | |
113 | struct lttng_kernel_old_channel old_channel; | |
114 | ||
115 | old_channel.overwrite = chops->overwrite; | |
116 | old_channel.subbuf_size = chops->subbuf_size; | |
117 | old_channel.num_subbuf = chops->num_subbuf; | |
118 | old_channel.switch_timer_interval = chops->switch_timer_interval; | |
119 | old_channel.read_timer_interval = chops->read_timer_interval; | |
120 | old_channel.output = chops->output; | |
f853c53a DG |
121 | |
122 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); | |
123 | /* | |
124 | * The new channel padding is smaller than the old ABI so we use the | |
125 | * new ABI padding size for the memcpy. | |
126 | */ | |
127 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); | |
4dbc372b JD |
128 | |
129 | return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel); | |
130 | } | |
131 | ||
132 | channel.overwrite = chops->overwrite; | |
133 | channel.subbuf_size = chops->subbuf_size; | |
134 | channel.num_subbuf = chops->num_subbuf; | |
135 | channel.switch_timer_interval = chops->switch_timer_interval; | |
136 | channel.read_timer_interval = chops->read_timer_interval; | |
137 | channel.output = chops->output; | |
ea207e3b | 138 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
4dbc372b JD |
139 | |
140 | return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel); | |
16421f6e DG |
141 | } |
142 | ||
6e911cad MD |
143 | int kernctl_enable_syscall(int fd, const char *syscall_name) |
144 | { | |
145 | struct lttng_kernel_event event; | |
146 | ||
147 | memset(&event, 0, sizeof(event)); | |
148 | strncpy(event.name, syscall_name, sizeof(event.name)); | |
149 | event.name[sizeof(event.name) - 1] = '\0'; | |
150 | event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
562ab9a8 | 151 | event.u.syscall.enable = 1; |
6e911cad MD |
152 | return ioctl(fd, LTTNG_KERNEL_EVENT, &event); |
153 | } | |
154 | ||
155 | int kernctl_disable_syscall(int fd, const char *syscall_name) | |
156 | { | |
157 | struct lttng_kernel_event event; | |
158 | ||
159 | memset(&event, 0, sizeof(event)); | |
160 | strncpy(event.name, syscall_name, sizeof(event.name)); | |
161 | event.name[sizeof(event.name) - 1] = '\0'; | |
162 | event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
562ab9a8 | 163 | event.u.syscall.enable = 0; |
6e911cad MD |
164 | return ioctl(fd, LTTNG_KERNEL_EVENT, &event); |
165 | } | |
166 | ||
46820c8b MD |
167 | int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits) |
168 | { | |
169 | struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL; | |
170 | size_t array_alloc_len; | |
171 | char *new_mask; | |
172 | int ret = 0; | |
173 | ||
174 | if (!syscall_mask) { | |
175 | ret = -1; | |
176 | goto end; | |
177 | } | |
178 | ||
179 | if (!nr_bits) { | |
180 | ret = -1; | |
181 | goto end; | |
182 | } | |
183 | ||
184 | kmask_len.len = 0; | |
185 | ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len); | |
186 | if (ret) { | |
187 | goto end; | |
188 | } | |
189 | ||
190 | array_alloc_len = ALIGN(kmask_len.len, 8) >> 3; | |
191 | kmask = zmalloc(sizeof(*kmask) + array_alloc_len); | |
192 | if (!kmask) { | |
193 | ret = -1; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | kmask->len = kmask_len.len; | |
198 | ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask); | |
199 | if (ret) { | |
200 | goto end; | |
201 | } | |
202 | ||
203 | new_mask = realloc(syscall_mask, array_alloc_len); | |
204 | if (!new_mask) { | |
205 | ret = -1; | |
206 | goto end; | |
207 | } | |
208 | memcpy(new_mask, kmask->mask, array_alloc_len); | |
209 | *syscall_mask = new_mask; | |
210 | *nr_bits = kmask->len; | |
211 | ||
212 | end: | |
213 | free(kmask); | |
214 | return ret; | |
215 | } | |
216 | ||
964ccb60 | 217 | int kernctl_create_stream(int fd) |
16421f6e | 218 | { |
4dbc372b JD |
219 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM, |
220 | LTTNG_KERNEL_STREAM); | |
16421f6e DG |
221 | } |
222 | ||
964ccb60 | 223 | int kernctl_create_event(int fd, struct lttng_kernel_event *ev) |
16421f6e | 224 | { |
4dbc372b JD |
225 | if (lttng_kernel_use_old_abi) { |
226 | struct lttng_kernel_old_event old_event; | |
227 | ||
228 | memcpy(old_event.name, ev->name, sizeof(old_event.name)); | |
229 | old_event.instrumentation = ev->instrumentation; | |
230 | switch (ev->instrumentation) { | |
231 | case LTTNG_KERNEL_KPROBE: | |
232 | old_event.u.kprobe.addr = ev->u.kprobe.addr; | |
233 | old_event.u.kprobe.offset = ev->u.kprobe.offset; | |
234 | memcpy(old_event.u.kprobe.symbol_name, | |
235 | ev->u.kprobe.symbol_name, | |
236 | sizeof(old_event.u.kprobe.symbol_name)); | |
237 | break; | |
238 | case LTTNG_KERNEL_KRETPROBE: | |
239 | old_event.u.kretprobe.addr = ev->u.kretprobe.addr; | |
240 | old_event.u.kretprobe.offset = ev->u.kretprobe.offset; | |
241 | memcpy(old_event.u.kretprobe.symbol_name, | |
242 | ev->u.kretprobe.symbol_name, | |
243 | sizeof(old_event.u.kretprobe.symbol_name)); | |
244 | break; | |
245 | case LTTNG_KERNEL_FUNCTION: | |
246 | memcpy(old_event.u.ftrace.symbol_name, | |
247 | ev->u.ftrace.symbol_name, | |
248 | sizeof(old_event.u.ftrace.symbol_name)); | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | ||
254 | return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event); | |
255 | } | |
964ccb60 | 256 | return ioctl(fd, LTTNG_KERNEL_EVENT, ev); |
16421f6e DG |
257 | } |
258 | ||
964ccb60 | 259 | int kernctl_add_context(int fd, struct lttng_kernel_context *ctx) |
16421f6e | 260 | { |
4dbc372b JD |
261 | if (lttng_kernel_use_old_abi) { |
262 | struct lttng_kernel_old_context old_ctx; | |
263 | ||
264 | old_ctx.ctx = ctx->ctx; | |
265 | /* only type that uses the union */ | |
aa3514e9 | 266 | if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) { |
4dbc372b JD |
267 | old_ctx.u.perf_counter.type = |
268 | ctx->u.perf_counter.type; | |
269 | old_ctx.u.perf_counter.config = | |
270 | ctx->u.perf_counter.config; | |
271 | memcpy(old_ctx.u.perf_counter.name, | |
272 | ctx->u.perf_counter.name, | |
273 | sizeof(old_ctx.u.perf_counter.name)); | |
274 | } | |
275 | return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx); | |
276 | } | |
964ccb60 | 277 | return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx); |
16421f6e DG |
278 | } |
279 | ||
964ccb60 | 280 | |
f3ed775e DG |
281 | /* Enable event, channel and session ioctl */ |
282 | int kernctl_enable(int fd) | |
283 | { | |
4dbc372b JD |
284 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE, |
285 | LTTNG_KERNEL_ENABLE); | |
f3ed775e DG |
286 | } |
287 | ||
288 | /* Disable event, channel and session ioctl */ | |
289 | int kernctl_disable(int fd) | |
290 | { | |
4dbc372b JD |
291 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE, |
292 | LTTNG_KERNEL_DISABLE); | |
f3ed775e DG |
293 | } |
294 | ||
964ccb60 | 295 | int kernctl_start_session(int fd) |
16421f6e | 296 | { |
4dbc372b JD |
297 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START, |
298 | LTTNG_KERNEL_SESSION_START); | |
964ccb60 MD |
299 | } |
300 | ||
301 | int kernctl_stop_session(int fd) | |
302 | { | |
4dbc372b JD |
303 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP, |
304 | LTTNG_KERNEL_SESSION_STOP); | |
16421f6e DG |
305 | } |
306 | ||
964ccb60 MD |
307 | int kernctl_tracepoint_list(int fd) |
308 | { | |
4dbc372b JD |
309 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST, |
310 | LTTNG_KERNEL_TRACEPOINT_LIST); | |
964ccb60 MD |
311 | } |
312 | ||
d02666a9 MD |
313 | int kernctl_syscall_list(int fd) |
314 | { | |
315 | return ioctl(fd, LTTNG_KERNEL_SYSCALL_LIST); | |
316 | } | |
317 | ||
964ccb60 MD |
318 | int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v) |
319 | { | |
4dbc372b JD |
320 | int ret; |
321 | ||
322 | if (lttng_kernel_use_old_abi == -1) { | |
323 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
324 | if (!ret) { | |
325 | lttng_kernel_use_old_abi = 0; | |
326 | goto end; | |
327 | } | |
328 | lttng_kernel_use_old_abi = 1; | |
329 | } | |
330 | if (lttng_kernel_use_old_abi) { | |
331 | struct lttng_kernel_old_tracer_version old_v; | |
332 | ||
333 | ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v); | |
334 | if (ret) { | |
335 | goto end; | |
336 | } | |
337 | v->major = old_v.major; | |
338 | v->minor = old_v.minor; | |
339 | v->patchlevel = old_v.patchlevel; | |
340 | } else { | |
341 | ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v); | |
342 | } | |
343 | ||
344 | end: | |
345 | return ret; | |
964ccb60 MD |
346 | } |
347 | ||
348 | int kernctl_wait_quiescent(int fd) | |
349 | { | |
4dbc372b JD |
350 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT, |
351 | LTTNG_KERNEL_WAIT_QUIESCENT); | |
964ccb60 MD |
352 | } |
353 | ||
354 | int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) | |
355 | { | |
4dbc372b JD |
356 | int ret; |
357 | ||
358 | if (lttng_kernel_use_old_abi == -1) { | |
359 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
360 | if (!ret) { | |
361 | lttng_kernel_use_old_abi = 0; | |
362 | goto end; | |
363 | } | |
364 | lttng_kernel_use_old_abi = 1; | |
365 | } | |
366 | if (lttng_kernel_use_old_abi) { | |
367 | struct lttng_kernel_old_calibrate old_calibrate; | |
368 | ||
369 | old_calibrate.type = calibrate->type; | |
370 | ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate); | |
371 | if (ret) { | |
372 | goto end; | |
373 | } | |
374 | calibrate->type = old_calibrate.type; | |
375 | } else { | |
376 | ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate); | |
377 | } | |
378 | ||
379 | end: | |
380 | return ret; | |
964ccb60 MD |
381 | } |
382 | ||
383 | ||
384 | int kernctl_buffer_flush(int fd) | |
385 | { | |
386 | return ioctl(fd, RING_BUFFER_FLUSH); | |
387 | } | |
388 | ||
389 | ||
390 | /* Buffer operations */ | |
391 | ||
392 | /* For mmap mode, readable without "get" operation */ | |
393 | ||
16421f6e DG |
394 | /* returns the length to mmap. */ |
395 | int kernctl_get_mmap_len(int fd, unsigned long *len) | |
396 | { | |
397 | return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len); | |
398 | } | |
399 | ||
964ccb60 MD |
400 | /* returns the maximum size for sub-buffers. */ |
401 | int kernctl_get_max_subbuf_size(int fd, unsigned long *len) | |
402 | { | |
403 | return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len); | |
404 | } | |
405 | ||
406 | /* | |
407 | * For mmap mode, operate on the current packet (between get/put or | |
408 | * get_next/put_next). | |
409 | */ | |
410 | ||
16421f6e DG |
411 | /* returns the offset of the subbuffer belonging to the mmap reader. */ |
412 | int kernctl_get_mmap_read_offset(int fd, unsigned long *off) | |
413 | { | |
414 | return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off); | |
415 | } | |
416 | ||
964ccb60 MD |
417 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
418 | int kernctl_get_subbuf_size(int fd, unsigned long *len) | |
16421f6e | 419 | { |
964ccb60 | 420 | return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len); |
16421f6e DG |
421 | } |
422 | ||
423 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
424 | int kernctl_get_padded_subbuf_size(int fd, unsigned long *len) | |
425 | { | |
426 | return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len); | |
427 | } | |
428 | ||
964ccb60 MD |
429 | /* Get exclusive read access to the next sub-buffer that can be read. */ |
430 | int kernctl_get_next_subbuf(int fd) | |
16421f6e | 431 | { |
964ccb60 | 432 | return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF); |
16421f6e DG |
433 | } |
434 | ||
d4a1283e | 435 | |
16421f6e DG |
436 | /* Release exclusive sub-buffer access, move consumer forward. */ |
437 | int kernctl_put_next_subbuf(int fd) | |
438 | { | |
439 | return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF); | |
440 | } | |
441 | ||
964ccb60 | 442 | /* snapshot */ |
16421f6e DG |
443 | |
444 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
445 | int kernctl_snapshot(int fd) | |
446 | { | |
447 | return ioctl(fd, RING_BUFFER_SNAPSHOT); | |
448 | } | |
449 | ||
450 | /* Get the consumer position (iteration start) */ | |
451 | int kernctl_snapshot_get_consumed(int fd, unsigned long *pos) | |
452 | { | |
453 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos); | |
454 | } | |
455 | ||
456 | /* Get the producer position (iteration end) */ | |
457 | int kernctl_snapshot_get_produced(int fd, unsigned long *pos) | |
458 | { | |
459 | return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos); | |
460 | } | |
461 | ||
964ccb60 MD |
462 | /* Get exclusive read access to the specified sub-buffer position */ |
463 | int kernctl_get_subbuf(int fd, unsigned long *len) | |
f3ed775e | 464 | { |
964ccb60 | 465 | return ioctl(fd, RING_BUFFER_GET_SUBBUF, len); |
f3ed775e | 466 | } |
d0254c7c | 467 | |
964ccb60 MD |
468 | /* Release exclusive sub-buffer access */ |
469 | int kernctl_put_subbuf(int fd) | |
d0254c7c | 470 | { |
964ccb60 | 471 | return ioctl(fd, RING_BUFFER_PUT_SUBBUF); |
d0254c7c | 472 | } |
309167d2 JD |
473 | |
474 | /* Returns the timestamp begin of the current sub-buffer. */ | |
475 | int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin) | |
476 | { | |
477 | return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN, timestamp_begin); | |
478 | } | |
479 | ||
480 | /* Returns the timestamp end of the current sub-buffer. */ | |
481 | int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end) | |
482 | { | |
483 | return ioctl(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END, timestamp_end); | |
484 | } | |
485 | ||
486 | /* Returns the number of discarded events in the current sub-buffer. */ | |
487 | int kernctl_get_events_discarded(int fd, uint64_t *events_discarded) | |
488 | { | |
489 | return ioctl(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED, events_discarded); | |
490 | } | |
491 | ||
492 | /* Returns the content size in the current sub-buffer. */ | |
493 | int kernctl_get_content_size(int fd, uint64_t *content_size) | |
494 | { | |
495 | return ioctl(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE, content_size); | |
496 | } | |
497 | ||
498 | /* Returns the packet size in the current sub-buffer. */ | |
499 | int kernctl_get_packet_size(int fd, uint64_t *packet_size) | |
500 | { | |
501 | return ioctl(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE, packet_size); | |
502 | } | |
503 | ||
504 | /* Returns the stream id of the current sub-buffer. */ | |
505 | int kernctl_get_stream_id(int fd, uint64_t *stream_id) | |
506 | { | |
507 | return ioctl(fd, LTTNG_RING_BUFFER_GET_STREAM_ID, stream_id); | |
508 | } | |
d3e2ba59 JD |
509 | |
510 | /* Returns the current timestamp. */ | |
511 | int kernctl_get_current_timestamp(int fd, uint64_t *ts) | |
512 | { | |
513 | return ioctl(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP, ts); | |
514 | } |