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57773204 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #include <string.h> | |
21 | #include <ust/lttng-ust-ctl.h> | |
22 | #include <ust/lttng-ust-abi.h> | |
23 | #include <ust/usterr-signal-safe.h> | |
24 | #include "lttng-ust-comm.h" | |
25 | ||
26 | #include "../libringbuffer/backend.h" | |
27 | #include "../libringbuffer/frontend.h" | |
28 | ||
6b120308 MD |
29 | volatile enum ust_loglevel ust_loglevel; |
30 | ||
57773204 MD |
31 | static |
32 | void init_object(struct object_data *data) | |
33 | { | |
34 | data->handle = -1; | |
35 | data->shm_fd = -1; | |
36 | data->wait_fd = -1; | |
37 | data->memory_map_size = 0; | |
38 | } | |
39 | ||
40 | void release_object(int sock, struct object_data *data) | |
41 | { | |
42 | struct ustcomm_ust_msg lum; | |
43 | struct ustcomm_ust_reply lur; | |
44 | int ret; | |
45 | ||
46 | if (data->shm_fd >= 0) | |
47 | close(data->shm_fd); | |
48 | if (data->wait_fd >= 0) | |
49 | close(data->wait_fd); | |
50 | memset(&lum, 0, sizeof(lum)); | |
51 | lum.handle = data->handle; | |
52 | lum.cmd = LTTNG_UST_RELEASE; | |
53 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
54 | assert(!ret); | |
55 | free(data); | |
56 | } | |
57 | ||
58 | /* | |
59 | * returns session handle. | |
60 | */ | |
61 | int ustctl_create_session(int sock) | |
62 | { | |
63 | struct ustcomm_ust_msg lum; | |
64 | struct ustcomm_ust_reply lur; | |
65 | int ret, session_handle; | |
66 | ||
67 | /* Create session */ | |
68 | memset(&lum, 0, sizeof(lum)); | |
69 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
70 | lum.cmd = LTTNG_UST_SESSION; | |
71 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
72 | if (ret) | |
73 | return ret; | |
74 | session_handle = lur.ret_val; | |
75 | DBG("received session handle %u", session_handle); | |
76 | return session_handle; | |
77 | } | |
78 | ||
79 | /* open the metadata global channel */ | |
80 | int ustctl_open_metadata(int sock, int session_handle, | |
81 | struct lttng_ust_channel_attr *chops, | |
82 | struct object_data **_metadata_data) | |
83 | { | |
84 | struct ustcomm_ust_msg lum; | |
85 | struct ustcomm_ust_reply lur; | |
86 | struct object_data *metadata_data; | |
87 | int ret; | |
88 | ||
89 | metadata_data = malloc(sizeof(*metadata_data)); | |
90 | if (!metadata_data) | |
91 | return -ENOMEM; | |
92 | init_object(metadata_data); | |
93 | /* Create metadata channel */ | |
94 | memset(&lum, 0, sizeof(lum)); | |
95 | lum.handle = session_handle; | |
96 | lum.cmd = LTTNG_UST_METADATA; | |
97 | lum.u.channel.overwrite = chops->overwrite; | |
98 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
99 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
100 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
101 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
102 | lum.u.channel.output = chops->output; | |
103 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
104 | if (ret) { | |
105 | free(metadata_data); | |
106 | return ret; | |
107 | } | |
108 | if (lur.ret_code != USTCOMM_OK) { | |
109 | free(metadata_data); | |
110 | return lur.ret_code; | |
111 | } | |
112 | metadata_data->handle = lur.ret_val; | |
113 | DBG("received metadata handle %u", metadata_data->handle); | |
114 | metadata_data->memory_map_size = lur.u.channel.memory_map_size; | |
115 | /* get shm fd */ | |
116 | ret = ustcomm_recv_fd(sock); | |
117 | if (ret < 0) | |
118 | goto error; | |
119 | metadata_data->shm_fd = ret; | |
120 | /* get wait fd */ | |
121 | ret = ustcomm_recv_fd(sock); | |
122 | if (ret < 0) | |
123 | goto error; | |
124 | metadata_data->wait_fd = ret; | |
125 | *_metadata_data = metadata_data; | |
126 | return 0; | |
127 | ||
128 | error: | |
129 | release_object(sock, metadata_data); | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
133 | int ustctl_create_channel(int sock, int session_handle, | |
134 | struct lttng_ust_channel_attr *chops, | |
135 | struct object_data **_channel_data) | |
136 | { | |
137 | struct ustcomm_ust_msg lum; | |
138 | struct ustcomm_ust_reply lur; | |
139 | struct object_data *channel_data; | |
140 | int ret; | |
141 | ||
142 | channel_data = malloc(sizeof(*channel_data)); | |
143 | if (!channel_data) | |
144 | return -ENOMEM; | |
145 | init_object(channel_data); | |
146 | /* Create metadata channel */ | |
147 | memset(&lum, 0, sizeof(lum)); | |
148 | lum.handle = session_handle; | |
149 | lum.cmd = LTTNG_UST_CHANNEL; | |
150 | lum.u.channel.overwrite = chops->overwrite; | |
151 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
152 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
153 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
154 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
155 | lum.u.channel.output = chops->output; | |
156 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
157 | if (ret) { | |
158 | free(channel_data); | |
159 | return ret; | |
160 | } | |
161 | if (lur.ret_code != USTCOMM_OK) { | |
162 | free(channel_data); | |
163 | return lur.ret_code; | |
164 | } | |
165 | channel_data->handle = lur.ret_val; | |
166 | DBG("received channel handle %u", channel_data->handle); | |
167 | channel_data->memory_map_size = lur.u.channel.memory_map_size; | |
168 | /* get shm fd */ | |
169 | ret = ustcomm_recv_fd(sock); | |
170 | if (ret < 0) | |
171 | goto error; | |
172 | channel_data->shm_fd = ret; | |
173 | /* get wait fd */ | |
174 | ret = ustcomm_recv_fd(sock); | |
175 | if (ret < 0) | |
176 | goto error; | |
177 | channel_data->wait_fd = ret; | |
178 | *_channel_data = channel_data; | |
179 | return 0; | |
180 | ||
181 | error: | |
182 | release_object(sock, channel_data); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Return -ENOENT if no more stream is available for creation. | |
188 | * Return 0 on success. | |
189 | * Return negative error value on error. | |
190 | */ | |
191 | int ustctl_create_stream(int sock, struct object_data *channel_data, | |
192 | struct object_data **_stream_data) | |
193 | { | |
194 | struct ustcomm_ust_msg lum; | |
195 | struct ustcomm_ust_reply lur; | |
196 | struct object_data *stream_data; | |
197 | int ret, fd; | |
198 | ||
199 | stream_data = malloc(sizeof(*stream_data)); | |
200 | if (!stream_data) | |
201 | return -ENOMEM; | |
202 | init_object(stream_data); | |
203 | memset(&lum, 0, sizeof(lum)); | |
204 | lum.handle = channel_data->handle; | |
205 | lum.cmd = LTTNG_UST_STREAM; | |
206 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
207 | if (ret) { | |
208 | free(stream_data); | |
209 | return ret; | |
210 | } | |
211 | if (lur.ret_code != USTCOMM_OK) { | |
212 | free(stream_data); | |
213 | return lur.ret_code; | |
214 | } | |
215 | ||
216 | stream_data->handle = lur.ret_val; | |
217 | DBG("received stream handle %u", stream_data->handle); | |
218 | stream_data->memory_map_size = lur.u.stream.memory_map_size; | |
219 | /* get shm fd */ | |
220 | fd = ustcomm_recv_fd(sock); | |
221 | if (fd < 0) | |
222 | goto error; | |
223 | stream_data->shm_fd = fd; | |
224 | /* get wait fd */ | |
225 | fd = ustcomm_recv_fd(sock); | |
226 | if (fd < 0) | |
227 | goto error; | |
228 | stream_data->wait_fd = fd; | |
229 | *_stream_data = stream_data; | |
230 | return ret; | |
231 | ||
232 | error: | |
233 | release_object(sock, stream_data); | |
234 | return -EINVAL; | |
235 | } | |
236 | ||
237 | int ustctl_create_event(int sock, struct lttng_ust_event *ev, | |
238 | struct object_data *channel_data, | |
239 | struct object_data **_event_data) | |
240 | { | |
241 | struct ustcomm_ust_msg lum; | |
242 | struct ustcomm_ust_reply lur; | |
243 | struct object_data *event_data; | |
244 | int ret; | |
245 | ||
246 | event_data = malloc(sizeof(*event_data)); | |
247 | if (!event_data) | |
248 | return -ENOMEM; | |
249 | init_object(event_data); | |
250 | memset(&lum, 0, sizeof(lum)); | |
251 | lum.handle = channel_data->handle; | |
252 | lum.cmd = LTTNG_UST_EVENT; | |
253 | strncpy(lum.u.event.name, ev->name, | |
254 | LTTNG_UST_SYM_NAME_LEN); | |
255 | lum.u.event.instrumentation = ev->instrumentation; | |
256 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
257 | if (ret) { | |
258 | free(event_data); | |
259 | return ret; | |
260 | } | |
261 | event_data->handle = lur.ret_val; | |
262 | DBG("received event handle %u", event_data->handle); | |
263 | *_event_data = event_data; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | int ustctl_add_context(int sock, struct lttng_ust_context *ctx, | |
268 | struct object_data *channel_data, | |
269 | struct object_data **_context_data) | |
270 | { | |
271 | struct ustcomm_ust_msg lum; | |
272 | struct ustcomm_ust_reply lur; | |
273 | struct object_data *context_data; | |
274 | int ret; | |
275 | ||
276 | context_data = malloc(sizeof(*context_data)); | |
277 | if (!context_data) | |
278 | return -ENOMEM; | |
279 | init_object(context_data); | |
280 | memset(&lum, 0, sizeof(lum)); | |
281 | lum.handle = channel_data->handle; | |
282 | lum.cmd = LTTNG_UST_CONTEXT; | |
283 | lum.u.context.ctx = ctx->ctx; | |
284 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
285 | if (ret) { | |
286 | free(context_data); | |
287 | return ret; | |
288 | } | |
289 | context_data->handle = lur.ret_val; | |
290 | DBG("received context handle %u", context_data->handle); | |
291 | *_context_data = context_data; | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /* Enable event, channel and session ioctl */ | |
296 | int ustctl_enable(int sock, struct object_data *object) | |
297 | { | |
298 | struct ustcomm_ust_msg lum; | |
299 | struct ustcomm_ust_reply lur; | |
300 | int ret; | |
301 | ||
302 | memset(&lum, 0, sizeof(lum)); | |
303 | lum.handle = object->handle; | |
304 | lum.cmd = LTTNG_UST_ENABLE; | |
305 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
306 | if (ret) | |
307 | return ret; | |
308 | DBG("enabled handle %u", object->handle); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | /* Disable event, channel and session ioctl */ | |
313 | int ustctl_disable(int sock, struct object_data *object) | |
314 | { | |
315 | struct ustcomm_ust_msg lum; | |
316 | struct ustcomm_ust_reply lur; | |
317 | int ret; | |
318 | ||
319 | memset(&lum, 0, sizeof(lum)); | |
320 | lum.handle = object->handle; | |
321 | lum.cmd = LTTNG_UST_DISABLE; | |
322 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
323 | if (ret) | |
324 | return ret; | |
325 | DBG("disable handle %u", object->handle); | |
326 | return 0; | |
327 | } | |
328 | ||
329 | int ustctl_start_session(int sock, struct object_data *object) | |
330 | { | |
331 | return ustctl_enable(sock, object); | |
332 | } | |
333 | ||
334 | int ustctl_stop_session(int sock, struct object_data *object) | |
335 | { | |
336 | return ustctl_disable(sock, object); | |
337 | } | |
338 | ||
339 | ||
340 | int ustctl_tracepoint_list(int sock) | |
341 | { | |
342 | return -ENOSYS; /* not implemented */ | |
343 | } | |
344 | ||
345 | int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v) | |
346 | { | |
347 | struct ustcomm_ust_msg lum; | |
348 | struct ustcomm_ust_reply lur; | |
349 | int ret; | |
350 | ||
351 | memset(&lum, 0, sizeof(lum)); | |
352 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
353 | lum.cmd = LTTNG_UST_TRACER_VERSION; | |
354 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
355 | if (ret) | |
356 | return ret; | |
357 | memcpy(v, &lur.u.version, sizeof(*v)); | |
358 | DBG("received tracer version"); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | int ustctl_wait_quiescent(int sock) | |
363 | { | |
364 | struct ustcomm_ust_msg lum; | |
365 | struct ustcomm_ust_reply lur; | |
366 | int ret; | |
367 | ||
368 | memset(&lum, 0, sizeof(lum)); | |
369 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
370 | lum.cmd = LTTNG_UST_WAIT_QUIESCENT; | |
371 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
372 | if (ret) | |
373 | return ret; | |
374 | DBG("waited for quiescent state"); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate) | |
379 | { | |
380 | return -ENOSYS; | |
381 | } | |
382 | ||
383 | /* Buffer operations */ | |
384 | ||
385 | /* Map channel shm into process memory */ | |
386 | struct shm_handle *ustctl_map_channel(struct object_data *chan_data) | |
387 | { | |
388 | struct shm_handle *handle; | |
389 | struct channel *chan; | |
390 | size_t chan_size; | |
391 | ||
392 | handle = channel_handle_create(chan_data->shm_fd, | |
393 | chan_data->wait_fd, | |
394 | chan_data->memory_map_size); | |
395 | if (!handle) { | |
396 | ERR("create handle error"); | |
397 | return NULL; | |
398 | } | |
399 | /* | |
400 | * Set to -1 because the shm_handle destruction will take care | |
401 | * of closing shm_fd and wait_fd. | |
402 | */ | |
403 | chan_data->shm_fd = -1; | |
404 | chan_data->wait_fd = -1; | |
405 | ||
406 | /* | |
407 | * TODO: add consistency checks to be resilient if the | |
408 | * application try to feed us with incoherent channel structure | |
409 | * values. | |
410 | */ | |
411 | chan = shmp(handle, handle->chan); | |
412 | /* chan is object 0. This is hardcoded. */ | |
413 | chan_size = handle->table->objects[0].allocated_len; | |
414 | handle->shadow_chan = malloc(chan_size); | |
415 | if (!handle->shadow_chan) { | |
416 | channel_destroy(chan, handle, 1); | |
417 | return NULL; | |
418 | } | |
419 | memcpy(handle->shadow_chan, chan, chan_size); | |
420 | return handle; | |
421 | } | |
422 | ||
423 | /* Add stream to channel shm and map its shm into process memory */ | |
424 | int ustctl_add_stream(struct shm_handle *handle, | |
425 | struct object_data *stream_data) | |
426 | { | |
427 | int ret; | |
428 | ||
429 | if (!stream_data->handle) | |
430 | return -ENOENT; | |
431 | /* map stream */ | |
432 | ret = channel_handle_add_stream(handle, | |
433 | stream_data->shm_fd, | |
434 | stream_data->wait_fd, | |
435 | stream_data->memory_map_size); | |
436 | if (ret) { | |
437 | ERR("add stream error\n"); | |
438 | return ret; | |
439 | } | |
440 | /* | |
441 | * Set to -1 because the shm_handle destruction will take care | |
442 | * of closing shm_fd and wait_fd. | |
443 | */ | |
444 | stream_data->shm_fd = -1; | |
445 | stream_data->wait_fd = -1; | |
446 | return 0; | |
447 | } | |
448 | ||
5224b5c8 MD |
449 | void ustctl_unmap_channel(struct shm_handle *handle) |
450 | { | |
451 | struct channel *chan; | |
452 | ||
453 | chan = shmp(handle, handle->chan); | |
454 | channel_destroy(chan, handle, 1); | |
455 | } | |
456 | ||
6e922b24 MD |
457 | struct lib_ring_buffer *ustctl_open_stream_read(struct shm_handle *handle, |
458 | int cpu) | |
459 | { | |
460 | struct channel *chan = handle->shadow_chan; | |
461 | int shm_fd, wait_fd; | |
462 | uint64_t memory_map_size; | |
463 | struct lib_ring_buffer *buf; | |
464 | int ret; | |
465 | ||
466 | buf = channel_get_ring_buffer(&chan->backend.config, | |
467 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
468 | if (!buf) | |
469 | return NULL; | |
470 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
471 | if (ret) | |
472 | return NULL; | |
473 | return buf; | |
474 | } | |
475 | ||
476 | void ustctl_close_stream_read(struct shm_handle *handle, | |
477 | struct lib_ring_buffer *buf) | |
478 | { | |
479 | lib_ring_buffer_release_read(buf, handle, 1); | |
480 | } | |
481 | ||
57773204 MD |
482 | /* For mmap mode, readable without "get" operation */ |
483 | ||
9095efe9 MD |
484 | void *ustctl_get_mmap_base(struct shm_handle *handle, |
485 | struct lib_ring_buffer *buf) | |
486 | { | |
487 | return shmp(handle, buf->backend.memory_map); | |
488 | } | |
489 | ||
57773204 MD |
490 | /* returns the length to mmap. */ |
491 | int ustctl_get_mmap_len(struct shm_handle *handle, | |
492 | struct lib_ring_buffer *buf, | |
493 | unsigned long *len) | |
494 | { | |
495 | unsigned long mmap_buf_len; | |
496 | struct channel *chan = handle->shadow_chan; | |
497 | ||
498 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
499 | return -EINVAL; | |
500 | mmap_buf_len = chan->backend.buf_size; | |
501 | if (chan->backend.extra_reader_sb) | |
502 | mmap_buf_len += chan->backend.subbuf_size; | |
503 | if (mmap_buf_len > INT_MAX) | |
504 | return -EFBIG; | |
505 | *len = mmap_buf_len; | |
506 | return 0; | |
507 | } | |
508 | ||
509 | /* returns the maximum size for sub-buffers. */ | |
510 | int ustctl_get_max_subbuf_size(struct shm_handle *handle, | |
511 | struct lib_ring_buffer *buf, | |
512 | unsigned long *len) | |
513 | { | |
514 | struct channel *chan = handle->shadow_chan; | |
515 | ||
516 | *len = chan->backend.subbuf_size; | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* | |
521 | * For mmap mode, operate on the current packet (between get/put or | |
522 | * get_next/put_next). | |
523 | */ | |
524 | ||
525 | /* returns the offset of the subbuffer belonging to the mmap reader. */ | |
526 | int ustctl_get_mmap_read_offset(struct shm_handle *handle, | |
527 | struct lib_ring_buffer *buf, unsigned long *off) | |
528 | { | |
529 | struct channel *chan = handle->shadow_chan; | |
530 | unsigned long sb_bindex; | |
531 | ||
532 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
533 | return -EINVAL; | |
534 | sb_bindex = subbuffer_id_get_index(&chan->backend.config, | |
535 | buf->backend.buf_rsb.id); | |
536 | *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset; | |
537 | return 0; | |
538 | } | |
539 | ||
540 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
541 | int ustctl_get_subbuf_size(struct shm_handle *handle, | |
542 | struct lib_ring_buffer *buf, unsigned long *len) | |
543 | { | |
544 | struct channel *chan = handle->shadow_chan; | |
545 | ||
546 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
547 | handle); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
552 | int ustctl_get_padded_subbuf_size(struct shm_handle *handle, | |
553 | struct lib_ring_buffer *buf, unsigned long *len) | |
554 | { | |
555 | struct channel *chan = handle->shadow_chan; | |
556 | ||
557 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
558 | handle); | |
559 | *len = PAGE_ALIGN(*len); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* Get exclusive read access to the next sub-buffer that can be read. */ | |
564 | int ustctl_get_next_subbuf(struct shm_handle *handle, | |
565 | struct lib_ring_buffer *buf) | |
566 | { | |
567 | return lib_ring_buffer_get_next_subbuf(buf, handle); | |
568 | } | |
569 | ||
570 | ||
571 | /* Release exclusive sub-buffer access, move consumer forward. */ | |
572 | int ustctl_put_next_subbuf(struct shm_handle *handle, | |
573 | struct lib_ring_buffer *buf) | |
574 | { | |
575 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* snapshot */ | |
580 | ||
581 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
582 | int ustctl_snapshot(struct shm_handle *handle, | |
583 | struct lib_ring_buffer *buf) | |
584 | { | |
585 | return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot, | |
586 | &buf->prod_snapshot, handle); | |
587 | } | |
588 | ||
589 | /* Get the consumer position (iteration start) */ | |
590 | int ustctl_snapshot_get_consumed(struct shm_handle *handle, | |
591 | struct lib_ring_buffer *buf, unsigned long *pos) | |
592 | { | |
593 | *pos = buf->cons_snapshot; | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* Get the producer position (iteration end) */ | |
598 | int ustctl_snapshot_get_produced(struct shm_handle *handle, | |
599 | struct lib_ring_buffer *buf, unsigned long *pos) | |
600 | { | |
601 | *pos = buf->prod_snapshot; | |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* Get exclusive read access to the specified sub-buffer position */ | |
606 | int ustctl_get_subbuf(struct shm_handle *handle, | |
607 | struct lib_ring_buffer *buf, unsigned long *pos) | |
608 | { | |
609 | return lib_ring_buffer_get_subbuf(buf, *pos, handle); | |
610 | } | |
611 | ||
612 | /* Release exclusive sub-buffer access */ | |
613 | int ustctl_put_subbuf(struct shm_handle *handle, | |
614 | struct lib_ring_buffer *buf) | |
615 | { | |
616 | lib_ring_buffer_put_subbuf(buf, handle); | |
617 | return 0; | |
618 | } | |
619 | ||
620 | int ustctl_buffer_flush(struct shm_handle *handle, | |
621 | struct lib_ring_buffer *buf) | |
622 | { | |
623 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE, handle); | |
624 | return 0; | |
625 | } |