Commit | Line | Data |
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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> | |
4318ae1b MD |
21 | #include <lttng/ust-ctl.h> |
22 | #include <lttng/ust-abi.h> | |
23 | #include <lttng/usterr-signal-safe.h> | |
24 | #include <lttng/ust-comm.h> | |
c1fca457 | 25 | #include <lttng/ust-events.h> |
7a784989 | 26 | #include <sys/mman.h> |
57773204 MD |
27 | |
28 | #include "../libringbuffer/backend.h" | |
29 | #include "../libringbuffer/frontend.h" | |
30 | ||
6b120308 MD |
31 | volatile enum ust_loglevel ust_loglevel; |
32 | ||
57773204 | 33 | static |
61f02aea | 34 | void init_object(struct lttng_ust_object_data *data) |
57773204 MD |
35 | { |
36 | data->handle = -1; | |
37 | data->shm_fd = -1; | |
38 | data->wait_fd = -1; | |
39 | data->memory_map_size = 0; | |
40 | } | |
41 | ||
5f9d3dbc | 42 | void ustctl_release_object(int sock, struct lttng_ust_object_data *data) |
57773204 MD |
43 | { |
44 | struct ustcomm_ust_msg lum; | |
45 | struct ustcomm_ust_reply lur; | |
46 | int ret; | |
47 | ||
48 | if (data->shm_fd >= 0) | |
49 | close(data->shm_fd); | |
50 | if (data->wait_fd >= 0) | |
51 | close(data->wait_fd); | |
52 | memset(&lum, 0, sizeof(lum)); | |
53 | lum.handle = data->handle; | |
54 | lum.cmd = LTTNG_UST_RELEASE; | |
55 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
56 | assert(!ret); | |
57 | free(data); | |
58 | } | |
59 | ||
1c5e467e MD |
60 | /* |
61 | * Send registration done packet to the application. | |
62 | */ | |
63 | int ustctl_register_done(int sock) | |
64 | { | |
65 | struct ustcomm_ust_msg lum; | |
66 | struct ustcomm_ust_reply lur; | |
67 | int ret; | |
68 | ||
69 | DBG("Sending register done command to %d", sock); | |
70 | memset(&lum, 0, sizeof(lum)); | |
71 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
72 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
73 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
74 | if (ret) | |
75 | return ret; | |
76 | if (lur.ret_code != USTCOMM_OK) { | |
77 | DBG("Return code: %s", ustcomm_get_readable_code(lur.ret_code)); | |
78 | goto error; | |
79 | } | |
80 | return 0; | |
81 | ||
82 | error: | |
83 | return -1; | |
84 | } | |
85 | ||
57773204 MD |
86 | /* |
87 | * returns session handle. | |
88 | */ | |
89 | int ustctl_create_session(int sock) | |
90 | { | |
91 | struct ustcomm_ust_msg lum; | |
92 | struct ustcomm_ust_reply lur; | |
93 | int ret, session_handle; | |
94 | ||
95 | /* Create session */ | |
96 | memset(&lum, 0, sizeof(lum)); | |
97 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
98 | lum.cmd = LTTNG_UST_SESSION; | |
99 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
100 | if (ret) | |
101 | return ret; | |
102 | session_handle = lur.ret_val; | |
103 | DBG("received session handle %u", session_handle); | |
104 | return session_handle; | |
105 | } | |
106 | ||
107 | /* open the metadata global channel */ | |
108 | int ustctl_open_metadata(int sock, int session_handle, | |
109 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 110 | struct lttng_ust_object_data **_metadata_data) |
57773204 MD |
111 | { |
112 | struct ustcomm_ust_msg lum; | |
113 | struct ustcomm_ust_reply lur; | |
61f02aea | 114 | struct lttng_ust_object_data *metadata_data; |
57773204 MD |
115 | int ret; |
116 | ||
117 | metadata_data = malloc(sizeof(*metadata_data)); | |
118 | if (!metadata_data) | |
119 | return -ENOMEM; | |
120 | init_object(metadata_data); | |
121 | /* Create metadata channel */ | |
122 | memset(&lum, 0, sizeof(lum)); | |
123 | lum.handle = session_handle; | |
124 | lum.cmd = LTTNG_UST_METADATA; | |
125 | lum.u.channel.overwrite = chops->overwrite; | |
126 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
127 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
128 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
129 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
130 | lum.u.channel.output = chops->output; | |
131 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
132 | if (ret) { | |
133 | free(metadata_data); | |
134 | return ret; | |
135 | } | |
136 | if (lur.ret_code != USTCOMM_OK) { | |
137 | free(metadata_data); | |
138 | return lur.ret_code; | |
139 | } | |
140 | metadata_data->handle = lur.ret_val; | |
141 | DBG("received metadata handle %u", metadata_data->handle); | |
142 | metadata_data->memory_map_size = lur.u.channel.memory_map_size; | |
143 | /* get shm fd */ | |
144 | ret = ustcomm_recv_fd(sock); | |
145 | if (ret < 0) | |
146 | goto error; | |
147 | metadata_data->shm_fd = ret; | |
148 | /* get wait fd */ | |
149 | ret = ustcomm_recv_fd(sock); | |
150 | if (ret < 0) | |
151 | goto error; | |
152 | metadata_data->wait_fd = ret; | |
153 | *_metadata_data = metadata_data; | |
154 | return 0; | |
155 | ||
156 | error: | |
5f9d3dbc | 157 | ustctl_release_object(sock, metadata_data); |
57773204 MD |
158 | return -EINVAL; |
159 | } | |
160 | ||
161 | int ustctl_create_channel(int sock, int session_handle, | |
162 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 163 | struct lttng_ust_object_data **_channel_data) |
57773204 MD |
164 | { |
165 | struct ustcomm_ust_msg lum; | |
166 | struct ustcomm_ust_reply lur; | |
61f02aea | 167 | struct lttng_ust_object_data *channel_data; |
57773204 MD |
168 | int ret; |
169 | ||
170 | channel_data = malloc(sizeof(*channel_data)); | |
171 | if (!channel_data) | |
172 | return -ENOMEM; | |
173 | init_object(channel_data); | |
174 | /* Create metadata channel */ | |
175 | memset(&lum, 0, sizeof(lum)); | |
176 | lum.handle = session_handle; | |
177 | lum.cmd = LTTNG_UST_CHANNEL; | |
178 | lum.u.channel.overwrite = chops->overwrite; | |
179 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
180 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
181 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
182 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
183 | lum.u.channel.output = chops->output; | |
184 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
185 | if (ret) { | |
186 | free(channel_data); | |
187 | return ret; | |
188 | } | |
189 | if (lur.ret_code != USTCOMM_OK) { | |
190 | free(channel_data); | |
191 | return lur.ret_code; | |
192 | } | |
193 | channel_data->handle = lur.ret_val; | |
194 | DBG("received channel handle %u", channel_data->handle); | |
195 | channel_data->memory_map_size = lur.u.channel.memory_map_size; | |
196 | /* get shm fd */ | |
197 | ret = ustcomm_recv_fd(sock); | |
198 | if (ret < 0) | |
199 | goto error; | |
200 | channel_data->shm_fd = ret; | |
201 | /* get wait fd */ | |
202 | ret = ustcomm_recv_fd(sock); | |
203 | if (ret < 0) | |
204 | goto error; | |
205 | channel_data->wait_fd = ret; | |
206 | *_channel_data = channel_data; | |
207 | return 0; | |
208 | ||
209 | error: | |
5f9d3dbc | 210 | ustctl_release_object(sock, channel_data); |
57773204 MD |
211 | return -EINVAL; |
212 | } | |
213 | ||
214 | /* | |
215 | * Return -ENOENT if no more stream is available for creation. | |
216 | * Return 0 on success. | |
217 | * Return negative error value on error. | |
218 | */ | |
61f02aea MD |
219 | int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data, |
220 | struct lttng_ust_object_data **_stream_data) | |
57773204 MD |
221 | { |
222 | struct ustcomm_ust_msg lum; | |
223 | struct ustcomm_ust_reply lur; | |
61f02aea | 224 | struct lttng_ust_object_data *stream_data; |
57773204 MD |
225 | int ret, fd; |
226 | ||
227 | stream_data = malloc(sizeof(*stream_data)); | |
228 | if (!stream_data) | |
229 | return -ENOMEM; | |
230 | init_object(stream_data); | |
231 | memset(&lum, 0, sizeof(lum)); | |
232 | lum.handle = channel_data->handle; | |
233 | lum.cmd = LTTNG_UST_STREAM; | |
234 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
235 | if (ret) { | |
236 | free(stream_data); | |
237 | return ret; | |
238 | } | |
239 | if (lur.ret_code != USTCOMM_OK) { | |
240 | free(stream_data); | |
241 | return lur.ret_code; | |
242 | } | |
243 | ||
244 | stream_data->handle = lur.ret_val; | |
245 | DBG("received stream handle %u", stream_data->handle); | |
246 | stream_data->memory_map_size = lur.u.stream.memory_map_size; | |
247 | /* get shm fd */ | |
248 | fd = ustcomm_recv_fd(sock); | |
249 | if (fd < 0) | |
250 | goto error; | |
251 | stream_data->shm_fd = fd; | |
252 | /* get wait fd */ | |
253 | fd = ustcomm_recv_fd(sock); | |
254 | if (fd < 0) | |
255 | goto error; | |
256 | stream_data->wait_fd = fd; | |
257 | *_stream_data = stream_data; | |
258 | return ret; | |
259 | ||
260 | error: | |
5f9d3dbc | 261 | ustctl_release_object(sock, stream_data); |
57773204 MD |
262 | return -EINVAL; |
263 | } | |
264 | ||
265 | int ustctl_create_event(int sock, struct lttng_ust_event *ev, | |
61f02aea MD |
266 | struct lttng_ust_object_data *channel_data, |
267 | struct lttng_ust_object_data **_event_data) | |
57773204 MD |
268 | { |
269 | struct ustcomm_ust_msg lum; | |
270 | struct ustcomm_ust_reply lur; | |
61f02aea | 271 | struct lttng_ust_object_data *event_data; |
57773204 MD |
272 | int ret; |
273 | ||
274 | event_data = malloc(sizeof(*event_data)); | |
275 | if (!event_data) | |
276 | return -ENOMEM; | |
277 | init_object(event_data); | |
278 | memset(&lum, 0, sizeof(lum)); | |
279 | lum.handle = channel_data->handle; | |
280 | lum.cmd = LTTNG_UST_EVENT; | |
281 | strncpy(lum.u.event.name, ev->name, | |
282 | LTTNG_UST_SYM_NAME_LEN); | |
283 | lum.u.event.instrumentation = ev->instrumentation; | |
284 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
285 | if (ret) { | |
286 | free(event_data); | |
287 | return ret; | |
288 | } | |
289 | event_data->handle = lur.ret_val; | |
290 | DBG("received event handle %u", event_data->handle); | |
291 | *_event_data = event_data; | |
292 | return 0; | |
293 | } | |
294 | ||
295 | int ustctl_add_context(int sock, struct lttng_ust_context *ctx, | |
61f02aea MD |
296 | struct lttng_ust_object_data *obj_data, |
297 | struct lttng_ust_object_data **_context_data) | |
57773204 MD |
298 | { |
299 | struct ustcomm_ust_msg lum; | |
300 | struct ustcomm_ust_reply lur; | |
61f02aea | 301 | struct lttng_ust_object_data *context_data; |
57773204 MD |
302 | int ret; |
303 | ||
304 | context_data = malloc(sizeof(*context_data)); | |
305 | if (!context_data) | |
306 | return -ENOMEM; | |
307 | init_object(context_data); | |
308 | memset(&lum, 0, sizeof(lum)); | |
3039d8ed | 309 | lum.handle = obj_data->handle; |
57773204 MD |
310 | lum.cmd = LTTNG_UST_CONTEXT; |
311 | lum.u.context.ctx = ctx->ctx; | |
312 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
313 | if (ret) { | |
314 | free(context_data); | |
315 | return ret; | |
316 | } | |
317 | context_data->handle = lur.ret_val; | |
318 | DBG("received context handle %u", context_data->handle); | |
319 | *_context_data = context_data; | |
320 | return ret; | |
321 | } | |
322 | ||
323 | /* Enable event, channel and session ioctl */ | |
61f02aea | 324 | int ustctl_enable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
325 | { |
326 | struct ustcomm_ust_msg lum; | |
327 | struct ustcomm_ust_reply lur; | |
328 | int ret; | |
329 | ||
330 | memset(&lum, 0, sizeof(lum)); | |
331 | lum.handle = object->handle; | |
332 | lum.cmd = LTTNG_UST_ENABLE; | |
333 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
334 | if (ret) | |
335 | return ret; | |
336 | DBG("enabled handle %u", object->handle); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | /* Disable event, channel and session ioctl */ | |
61f02aea | 341 | int ustctl_disable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
342 | { |
343 | struct ustcomm_ust_msg lum; | |
344 | struct ustcomm_ust_reply lur; | |
345 | int ret; | |
346 | ||
347 | memset(&lum, 0, sizeof(lum)); | |
348 | lum.handle = object->handle; | |
349 | lum.cmd = LTTNG_UST_DISABLE; | |
350 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
351 | if (ret) | |
352 | return ret; | |
353 | DBG("disable handle %u", object->handle); | |
354 | return 0; | |
355 | } | |
356 | ||
4a6ca058 | 357 | int ustctl_start_session(int sock, int handle) |
57773204 | 358 | { |
61f02aea | 359 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
360 | |
361 | obj.handle = handle; | |
362 | return ustctl_enable(sock, &obj); | |
57773204 MD |
363 | } |
364 | ||
4a6ca058 | 365 | int ustctl_stop_session(int sock, int handle) |
57773204 | 366 | { |
61f02aea | 367 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
368 | |
369 | obj.handle = handle; | |
370 | return ustctl_disable(sock, &obj); | |
57773204 MD |
371 | } |
372 | ||
57773204 MD |
373 | int ustctl_tracepoint_list(int sock) |
374 | { | |
b115631f MD |
375 | struct ustcomm_ust_msg lum; |
376 | struct ustcomm_ust_reply lur; | |
377 | int ret, tp_list_handle; | |
378 | ||
379 | memset(&lum, 0, sizeof(lum)); | |
380 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
381 | lum.cmd = LTTNG_UST_TRACEPOINT_LIST; | |
382 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
383 | if (ret) | |
384 | return ret; | |
385 | tp_list_handle = lur.ret_val; | |
386 | DBG("received tracepoint list handle %u", tp_list_handle); | |
387 | return tp_list_handle; | |
388 | } | |
389 | ||
390 | int ustctl_tracepoint_list_get(int sock, int tp_list_handle, | |
391 | char iter[LTTNG_UST_SYM_NAME_LEN]) | |
392 | { | |
393 | struct ustcomm_ust_msg lum; | |
394 | struct ustcomm_ust_reply lur; | |
395 | int ret; | |
396 | ||
397 | memset(&lum, 0, sizeof(lum)); | |
398 | lum.handle = tp_list_handle; | |
399 | lum.cmd = LTTNG_UST_TRACEPOINT_LIST_GET; | |
400 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
401 | if (ret) | |
402 | return ret; | |
403 | DBG("received tracepoint list entry %s", lur.u.tracepoint_list_entry); | |
404 | memcpy(iter, lur.u.tracepoint_list_entry, LTTNG_UST_SYM_NAME_LEN); | |
405 | return 0; | |
57773204 MD |
406 | } |
407 | ||
408 | int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v) | |
409 | { | |
410 | struct ustcomm_ust_msg lum; | |
411 | struct ustcomm_ust_reply lur; | |
412 | int ret; | |
413 | ||
414 | memset(&lum, 0, sizeof(lum)); | |
415 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
416 | lum.cmd = LTTNG_UST_TRACER_VERSION; | |
417 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
418 | if (ret) | |
419 | return ret; | |
420 | memcpy(v, &lur.u.version, sizeof(*v)); | |
421 | DBG("received tracer version"); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | int ustctl_wait_quiescent(int sock) | |
426 | { | |
427 | struct ustcomm_ust_msg lum; | |
428 | struct ustcomm_ust_reply lur; | |
429 | int ret; | |
430 | ||
431 | memset(&lum, 0, sizeof(lum)); | |
432 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
433 | lum.cmd = LTTNG_UST_WAIT_QUIESCENT; | |
434 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
435 | if (ret) | |
436 | return ret; | |
437 | DBG("waited for quiescent state"); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate) | |
442 | { | |
443 | return -ENOSYS; | |
444 | } | |
445 | ||
446 | /* Buffer operations */ | |
447 | ||
448 | /* Map channel shm into process memory */ | |
38fae1d3 | 449 | struct lttng_ust_shm_handle *ustctl_map_channel(struct lttng_ust_object_data *chan_data) |
57773204 | 450 | { |
38fae1d3 | 451 | struct lttng_ust_shm_handle *handle; |
57773204 MD |
452 | struct channel *chan; |
453 | size_t chan_size; | |
c1fca457 | 454 | struct lttng_ust_lib_ring_buffer_config *config; |
7a784989 | 455 | int ret; |
57773204 MD |
456 | |
457 | handle = channel_handle_create(chan_data->shm_fd, | |
458 | chan_data->wait_fd, | |
459 | chan_data->memory_map_size); | |
460 | if (!handle) { | |
461 | ERR("create handle error"); | |
462 | return NULL; | |
463 | } | |
464 | /* | |
38fae1d3 | 465 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
466 | * of closing shm_fd and wait_fd. |
467 | */ | |
468 | chan_data->shm_fd = -1; | |
469 | chan_data->wait_fd = -1; | |
470 | ||
471 | /* | |
472 | * TODO: add consistency checks to be resilient if the | |
473 | * application try to feed us with incoherent channel structure | |
474 | * values. | |
475 | */ | |
476 | chan = shmp(handle, handle->chan); | |
477 | /* chan is object 0. This is hardcoded. */ | |
478 | chan_size = handle->table->objects[0].allocated_len; | |
479 | handle->shadow_chan = malloc(chan_size); | |
480 | if (!handle->shadow_chan) { | |
481 | channel_destroy(chan, handle, 1); | |
482 | return NULL; | |
483 | } | |
484 | memcpy(handle->shadow_chan, chan, chan_size); | |
bbc70d1b MD |
485 | /* |
486 | * The callback pointers in the producer are invalid in the | |
c1fca457 | 487 | * consumer. We need to look them up here. |
bbc70d1b | 488 | */ |
c1fca457 MD |
489 | config = &handle->shadow_chan->backend.config; |
490 | switch (config->client_type) { | |
491 | case LTTNG_CLIENT_METADATA: | |
492 | memcpy(&config->cb, lttng_client_callbacks_metadata, | |
493 | sizeof(config->cb)); | |
494 | break; | |
495 | case LTTNG_CLIENT_DISCARD: | |
496 | memcpy(&config->cb, lttng_client_callbacks_discard, | |
497 | sizeof(config->cb)); | |
498 | break; | |
499 | case LTTNG_CLIENT_OVERWRITE: | |
500 | memcpy(&config->cb, lttng_client_callbacks_overwrite, | |
501 | sizeof(config->cb)); | |
502 | break; | |
503 | default: | |
504 | ERR("Unknown client type %d", config->client_type); | |
505 | channel_destroy(chan, handle, 1); | |
506 | return NULL; | |
507 | } | |
7a784989 MD |
508 | /* Replace the object table pointer. */ |
509 | ret = munmap(handle->table->objects[0].memory_map, | |
510 | handle->table->objects[0].memory_map_size); | |
511 | if (ret) { | |
512 | perror("munmap"); | |
513 | assert(0); | |
514 | } | |
515 | handle->table->objects[0].memory_map = (char *) handle->shadow_chan; | |
516 | handle->table->objects[0].is_shadow = 1; | |
57773204 MD |
517 | return handle; |
518 | } | |
519 | ||
520 | /* Add stream to channel shm and map its shm into process memory */ | |
38fae1d3 | 521 | int ustctl_add_stream(struct lttng_ust_shm_handle *handle, |
61f02aea | 522 | struct lttng_ust_object_data *stream_data) |
57773204 MD |
523 | { |
524 | int ret; | |
525 | ||
526 | if (!stream_data->handle) | |
527 | return -ENOENT; | |
528 | /* map stream */ | |
529 | ret = channel_handle_add_stream(handle, | |
530 | stream_data->shm_fd, | |
531 | stream_data->wait_fd, | |
532 | stream_data->memory_map_size); | |
533 | if (ret) { | |
534 | ERR("add stream error\n"); | |
535 | return ret; | |
536 | } | |
537 | /* | |
38fae1d3 | 538 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
539 | * of closing shm_fd and wait_fd. |
540 | */ | |
541 | stream_data->shm_fd = -1; | |
542 | stream_data->wait_fd = -1; | |
543 | return 0; | |
544 | } | |
545 | ||
38fae1d3 | 546 | void ustctl_unmap_channel(struct lttng_ust_shm_handle *handle) |
5224b5c8 MD |
547 | { |
548 | struct channel *chan; | |
549 | ||
550 | chan = shmp(handle, handle->chan); | |
551 | channel_destroy(chan, handle, 1); | |
552 | } | |
553 | ||
4cfec15c | 554 | struct lttng_ust_lib_ring_buffer *ustctl_open_stream_read(struct lttng_ust_shm_handle *handle, |
6e922b24 MD |
555 | int cpu) |
556 | { | |
557 | struct channel *chan = handle->shadow_chan; | |
558 | int shm_fd, wait_fd; | |
559 | uint64_t memory_map_size; | |
4cfec15c | 560 | struct lttng_ust_lib_ring_buffer *buf; |
6e922b24 MD |
561 | int ret; |
562 | ||
563 | buf = channel_get_ring_buffer(&chan->backend.config, | |
564 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
565 | if (!buf) | |
566 | return NULL; | |
567 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
568 | if (ret) | |
569 | return NULL; | |
570 | return buf; | |
571 | } | |
572 | ||
38fae1d3 | 573 | void ustctl_close_stream_read(struct lttng_ust_shm_handle *handle, |
4cfec15c | 574 | struct lttng_ust_lib_ring_buffer *buf) |
6e922b24 MD |
575 | { |
576 | lib_ring_buffer_release_read(buf, handle, 1); | |
577 | } | |
578 | ||
57773204 MD |
579 | /* For mmap mode, readable without "get" operation */ |
580 | ||
38fae1d3 | 581 | void *ustctl_get_mmap_base(struct lttng_ust_shm_handle *handle, |
4cfec15c | 582 | struct lttng_ust_lib_ring_buffer *buf) |
9095efe9 MD |
583 | { |
584 | return shmp(handle, buf->backend.memory_map); | |
585 | } | |
586 | ||
57773204 | 587 | /* returns the length to mmap. */ |
38fae1d3 | 588 | int ustctl_get_mmap_len(struct lttng_ust_shm_handle *handle, |
4cfec15c | 589 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
590 | unsigned long *len) |
591 | { | |
592 | unsigned long mmap_buf_len; | |
593 | struct channel *chan = handle->shadow_chan; | |
594 | ||
595 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
596 | return -EINVAL; | |
597 | mmap_buf_len = chan->backend.buf_size; | |
598 | if (chan->backend.extra_reader_sb) | |
599 | mmap_buf_len += chan->backend.subbuf_size; | |
600 | if (mmap_buf_len > INT_MAX) | |
601 | return -EFBIG; | |
602 | *len = mmap_buf_len; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | /* returns the maximum size for sub-buffers. */ | |
38fae1d3 | 607 | int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 608 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
609 | unsigned long *len) |
610 | { | |
611 | struct channel *chan = handle->shadow_chan; | |
612 | ||
613 | *len = chan->backend.subbuf_size; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * For mmap mode, operate on the current packet (between get/put or | |
619 | * get_next/put_next). | |
620 | */ | |
621 | ||
622 | /* returns the offset of the subbuffer belonging to the mmap reader. */ | |
38fae1d3 | 623 | int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle, |
4cfec15c | 624 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *off) |
57773204 MD |
625 | { |
626 | struct channel *chan = handle->shadow_chan; | |
627 | unsigned long sb_bindex; | |
628 | ||
629 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
630 | return -EINVAL; | |
631 | sb_bindex = subbuffer_id_get_index(&chan->backend.config, | |
632 | buf->backend.buf_rsb.id); | |
633 | *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset; | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 638 | int ustctl_get_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 639 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
640 | { |
641 | struct channel *chan = handle->shadow_chan; | |
642 | ||
643 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
644 | handle); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 649 | int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 650 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
651 | { |
652 | struct channel *chan = handle->shadow_chan; | |
653 | ||
654 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
655 | handle); | |
656 | *len = PAGE_ALIGN(*len); | |
657 | return 0; | |
658 | } | |
659 | ||
660 | /* Get exclusive read access to the next sub-buffer that can be read. */ | |
38fae1d3 | 661 | int ustctl_get_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 662 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
663 | { |
664 | return lib_ring_buffer_get_next_subbuf(buf, handle); | |
665 | } | |
666 | ||
667 | ||
668 | /* Release exclusive sub-buffer access, move consumer forward. */ | |
38fae1d3 | 669 | int ustctl_put_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 670 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
671 | { |
672 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
673 | return 0; | |
674 | } | |
675 | ||
676 | /* snapshot */ | |
677 | ||
678 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
38fae1d3 | 679 | int ustctl_snapshot(struct lttng_ust_shm_handle *handle, |
4cfec15c | 680 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
681 | { |
682 | return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot, | |
683 | &buf->prod_snapshot, handle); | |
684 | } | |
685 | ||
686 | /* Get the consumer position (iteration start) */ | |
38fae1d3 | 687 | int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle *handle, |
4cfec15c | 688 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
689 | { |
690 | *pos = buf->cons_snapshot; | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /* Get the producer position (iteration end) */ | |
38fae1d3 | 695 | int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle *handle, |
4cfec15c | 696 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
697 | { |
698 | *pos = buf->prod_snapshot; | |
699 | return 0; | |
700 | } | |
701 | ||
702 | /* Get exclusive read access to the specified sub-buffer position */ | |
38fae1d3 | 703 | int ustctl_get_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 704 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
705 | { |
706 | return lib_ring_buffer_get_subbuf(buf, *pos, handle); | |
707 | } | |
708 | ||
709 | /* Release exclusive sub-buffer access */ | |
38fae1d3 | 710 | int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 711 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
712 | { |
713 | lib_ring_buffer_put_subbuf(buf, handle); | |
714 | return 0; | |
715 | } | |
716 | ||
02a15cfb | 717 | void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle, |
b52190f2 MD |
718 | struct lttng_ust_lib_ring_buffer *buf, |
719 | int producer_active) | |
57773204 | 720 | { |
b52190f2 MD |
721 | lib_ring_buffer_switch_slow(buf, |
722 | producer_active ? SWITCH_ACTIVE : SWITCH_FLUSH, | |
723 | handle); | |
57773204 | 724 | } |