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> | |
c1fca457 | 23 | #include <lttng/ust-events.h> |
7a784989 | 24 | #include <sys/mman.h> |
44c72f10 MD |
25 | |
26 | #include <usterr-signal-safe.h> | |
b728d87e | 27 | #include <ust-comm.h> |
57773204 MD |
28 | |
29 | #include "../libringbuffer/backend.h" | |
30 | #include "../libringbuffer/frontend.h" | |
31 | ||
6b120308 MD |
32 | volatile enum ust_loglevel ust_loglevel; |
33 | ||
57773204 | 34 | static |
61f02aea | 35 | void init_object(struct lttng_ust_object_data *data) |
57773204 MD |
36 | { |
37 | data->handle = -1; | |
38 | data->shm_fd = -1; | |
39 | data->wait_fd = -1; | |
40 | data->memory_map_size = 0; | |
41 | } | |
42 | ||
12388166 MD |
43 | /* |
44 | * If sock is negative, it means we don't have to notify the other side | |
45 | * (e.g. application has already vanished). | |
46 | */ | |
5f9d3dbc | 47 | void ustctl_release_object(int sock, struct lttng_ust_object_data *data) |
57773204 MD |
48 | { |
49 | struct ustcomm_ust_msg lum; | |
50 | struct ustcomm_ust_reply lur; | |
51 | int ret; | |
52 | ||
53 | if (data->shm_fd >= 0) | |
54 | close(data->shm_fd); | |
55 | if (data->wait_fd >= 0) | |
56 | close(data->wait_fd); | |
12388166 MD |
57 | if (sock >= 0) { |
58 | memset(&lum, 0, sizeof(lum)); | |
59 | lum.handle = data->handle; | |
60 | lum.cmd = LTTNG_UST_RELEASE; | |
61 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
62 | assert(!ret); | |
63 | } | |
57773204 MD |
64 | free(data); |
65 | } | |
66 | ||
1c5e467e MD |
67 | /* |
68 | * Send registration done packet to the application. | |
69 | */ | |
70 | int ustctl_register_done(int sock) | |
71 | { | |
72 | struct ustcomm_ust_msg lum; | |
73 | struct ustcomm_ust_reply lur; | |
74 | int ret; | |
75 | ||
76 | DBG("Sending register done command to %d", sock); | |
77 | memset(&lum, 0, sizeof(lum)); | |
78 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
79 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
80 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
81 | if (ret) | |
82 | return ret; | |
83 | if (lur.ret_code != USTCOMM_OK) { | |
84 | DBG("Return code: %s", ustcomm_get_readable_code(lur.ret_code)); | |
85 | goto error; | |
86 | } | |
87 | return 0; | |
88 | ||
89 | error: | |
90 | return -1; | |
91 | } | |
92 | ||
57773204 MD |
93 | /* |
94 | * returns session handle. | |
95 | */ | |
96 | int ustctl_create_session(int sock) | |
97 | { | |
98 | struct ustcomm_ust_msg lum; | |
99 | struct ustcomm_ust_reply lur; | |
100 | int ret, session_handle; | |
101 | ||
102 | /* Create session */ | |
103 | memset(&lum, 0, sizeof(lum)); | |
104 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
105 | lum.cmd = LTTNG_UST_SESSION; | |
106 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
107 | if (ret) | |
108 | return ret; | |
109 | session_handle = lur.ret_val; | |
110 | DBG("received session handle %u", session_handle); | |
111 | return session_handle; | |
112 | } | |
113 | ||
114 | /* open the metadata global channel */ | |
115 | int ustctl_open_metadata(int sock, int session_handle, | |
116 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 117 | struct lttng_ust_object_data **_metadata_data) |
57773204 MD |
118 | { |
119 | struct ustcomm_ust_msg lum; | |
120 | struct ustcomm_ust_reply lur; | |
61f02aea | 121 | struct lttng_ust_object_data *metadata_data; |
57773204 MD |
122 | int ret; |
123 | ||
124 | metadata_data = malloc(sizeof(*metadata_data)); | |
125 | if (!metadata_data) | |
126 | return -ENOMEM; | |
127 | init_object(metadata_data); | |
128 | /* Create metadata channel */ | |
129 | memset(&lum, 0, sizeof(lum)); | |
130 | lum.handle = session_handle; | |
131 | lum.cmd = LTTNG_UST_METADATA; | |
132 | lum.u.channel.overwrite = chops->overwrite; | |
133 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
134 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
135 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
136 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
137 | lum.u.channel.output = chops->output; | |
138 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
139 | if (ret) { | |
140 | free(metadata_data); | |
141 | return ret; | |
142 | } | |
143 | if (lur.ret_code != USTCOMM_OK) { | |
144 | free(metadata_data); | |
145 | return lur.ret_code; | |
146 | } | |
147 | metadata_data->handle = lur.ret_val; | |
148 | DBG("received metadata handle %u", metadata_data->handle); | |
149 | metadata_data->memory_map_size = lur.u.channel.memory_map_size; | |
150 | /* get shm fd */ | |
151 | ret = ustcomm_recv_fd(sock); | |
152 | if (ret < 0) | |
153 | goto error; | |
154 | metadata_data->shm_fd = ret; | |
155 | /* get wait fd */ | |
156 | ret = ustcomm_recv_fd(sock); | |
157 | if (ret < 0) | |
158 | goto error; | |
159 | metadata_data->wait_fd = ret; | |
160 | *_metadata_data = metadata_data; | |
161 | return 0; | |
162 | ||
163 | error: | |
5f9d3dbc | 164 | ustctl_release_object(sock, metadata_data); |
57773204 MD |
165 | return -EINVAL; |
166 | } | |
167 | ||
168 | int ustctl_create_channel(int sock, int session_handle, | |
169 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 170 | struct lttng_ust_object_data **_channel_data) |
57773204 MD |
171 | { |
172 | struct ustcomm_ust_msg lum; | |
173 | struct ustcomm_ust_reply lur; | |
61f02aea | 174 | struct lttng_ust_object_data *channel_data; |
57773204 MD |
175 | int ret; |
176 | ||
177 | channel_data = malloc(sizeof(*channel_data)); | |
178 | if (!channel_data) | |
179 | return -ENOMEM; | |
180 | init_object(channel_data); | |
181 | /* Create metadata channel */ | |
182 | memset(&lum, 0, sizeof(lum)); | |
183 | lum.handle = session_handle; | |
184 | lum.cmd = LTTNG_UST_CHANNEL; | |
185 | lum.u.channel.overwrite = chops->overwrite; | |
186 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
187 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
188 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
189 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
190 | lum.u.channel.output = chops->output; | |
191 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
192 | if (ret) { | |
193 | free(channel_data); | |
194 | return ret; | |
195 | } | |
196 | if (lur.ret_code != USTCOMM_OK) { | |
197 | free(channel_data); | |
198 | return lur.ret_code; | |
199 | } | |
200 | channel_data->handle = lur.ret_val; | |
201 | DBG("received channel handle %u", channel_data->handle); | |
202 | channel_data->memory_map_size = lur.u.channel.memory_map_size; | |
203 | /* get shm fd */ | |
204 | ret = ustcomm_recv_fd(sock); | |
205 | if (ret < 0) | |
206 | goto error; | |
207 | channel_data->shm_fd = ret; | |
208 | /* get wait fd */ | |
209 | ret = ustcomm_recv_fd(sock); | |
210 | if (ret < 0) | |
211 | goto error; | |
212 | channel_data->wait_fd = ret; | |
213 | *_channel_data = channel_data; | |
214 | return 0; | |
215 | ||
216 | error: | |
5f9d3dbc | 217 | ustctl_release_object(sock, channel_data); |
57773204 MD |
218 | return -EINVAL; |
219 | } | |
220 | ||
221 | /* | |
222 | * Return -ENOENT if no more stream is available for creation. | |
223 | * Return 0 on success. | |
224 | * Return negative error value on error. | |
225 | */ | |
61f02aea MD |
226 | int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data, |
227 | struct lttng_ust_object_data **_stream_data) | |
57773204 MD |
228 | { |
229 | struct ustcomm_ust_msg lum; | |
230 | struct ustcomm_ust_reply lur; | |
61f02aea | 231 | struct lttng_ust_object_data *stream_data; |
57773204 MD |
232 | int ret, fd; |
233 | ||
234 | stream_data = malloc(sizeof(*stream_data)); | |
235 | if (!stream_data) | |
236 | return -ENOMEM; | |
237 | init_object(stream_data); | |
238 | memset(&lum, 0, sizeof(lum)); | |
239 | lum.handle = channel_data->handle; | |
240 | lum.cmd = LTTNG_UST_STREAM; | |
241 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
242 | if (ret) { | |
243 | free(stream_data); | |
244 | return ret; | |
245 | } | |
246 | if (lur.ret_code != USTCOMM_OK) { | |
247 | free(stream_data); | |
248 | return lur.ret_code; | |
249 | } | |
250 | ||
251 | stream_data->handle = lur.ret_val; | |
252 | DBG("received stream handle %u", stream_data->handle); | |
253 | stream_data->memory_map_size = lur.u.stream.memory_map_size; | |
254 | /* get shm fd */ | |
255 | fd = ustcomm_recv_fd(sock); | |
256 | if (fd < 0) | |
257 | goto error; | |
258 | stream_data->shm_fd = fd; | |
259 | /* get wait fd */ | |
260 | fd = ustcomm_recv_fd(sock); | |
261 | if (fd < 0) | |
262 | goto error; | |
263 | stream_data->wait_fd = fd; | |
264 | *_stream_data = stream_data; | |
265 | return ret; | |
266 | ||
267 | error: | |
5f9d3dbc | 268 | ustctl_release_object(sock, stream_data); |
57773204 MD |
269 | return -EINVAL; |
270 | } | |
271 | ||
272 | int ustctl_create_event(int sock, struct lttng_ust_event *ev, | |
61f02aea MD |
273 | struct lttng_ust_object_data *channel_data, |
274 | struct lttng_ust_object_data **_event_data) | |
57773204 MD |
275 | { |
276 | struct ustcomm_ust_msg lum; | |
277 | struct ustcomm_ust_reply lur; | |
61f02aea | 278 | struct lttng_ust_object_data *event_data; |
57773204 MD |
279 | int ret; |
280 | ||
281 | event_data = malloc(sizeof(*event_data)); | |
282 | if (!event_data) | |
283 | return -ENOMEM; | |
284 | init_object(event_data); | |
285 | memset(&lum, 0, sizeof(lum)); | |
286 | lum.handle = channel_data->handle; | |
287 | lum.cmd = LTTNG_UST_EVENT; | |
288 | strncpy(lum.u.event.name, ev->name, | |
289 | LTTNG_UST_SYM_NAME_LEN); | |
290 | lum.u.event.instrumentation = ev->instrumentation; | |
291 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
292 | if (ret) { | |
293 | free(event_data); | |
294 | return ret; | |
295 | } | |
296 | event_data->handle = lur.ret_val; | |
297 | DBG("received event handle %u", event_data->handle); | |
298 | *_event_data = event_data; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | int ustctl_add_context(int sock, struct lttng_ust_context *ctx, | |
61f02aea MD |
303 | struct lttng_ust_object_data *obj_data, |
304 | struct lttng_ust_object_data **_context_data) | |
57773204 MD |
305 | { |
306 | struct ustcomm_ust_msg lum; | |
307 | struct ustcomm_ust_reply lur; | |
61f02aea | 308 | struct lttng_ust_object_data *context_data; |
57773204 MD |
309 | int ret; |
310 | ||
311 | context_data = malloc(sizeof(*context_data)); | |
312 | if (!context_data) | |
313 | return -ENOMEM; | |
314 | init_object(context_data); | |
315 | memset(&lum, 0, sizeof(lum)); | |
3039d8ed | 316 | lum.handle = obj_data->handle; |
57773204 MD |
317 | lum.cmd = LTTNG_UST_CONTEXT; |
318 | lum.u.context.ctx = ctx->ctx; | |
319 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
320 | if (ret) { | |
321 | free(context_data); | |
322 | return ret; | |
323 | } | |
324 | context_data->handle = lur.ret_val; | |
325 | DBG("received context handle %u", context_data->handle); | |
326 | *_context_data = context_data; | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* Enable event, channel and session ioctl */ | |
61f02aea | 331 | int ustctl_enable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
332 | { |
333 | struct ustcomm_ust_msg lum; | |
334 | struct ustcomm_ust_reply lur; | |
335 | int ret; | |
336 | ||
337 | memset(&lum, 0, sizeof(lum)); | |
338 | lum.handle = object->handle; | |
339 | lum.cmd = LTTNG_UST_ENABLE; | |
340 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
341 | if (ret) | |
342 | return ret; | |
343 | DBG("enabled handle %u", object->handle); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* Disable event, channel and session ioctl */ | |
61f02aea | 348 | int ustctl_disable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
349 | { |
350 | struct ustcomm_ust_msg lum; | |
351 | struct ustcomm_ust_reply lur; | |
352 | int ret; | |
353 | ||
354 | memset(&lum, 0, sizeof(lum)); | |
355 | lum.handle = object->handle; | |
356 | lum.cmd = LTTNG_UST_DISABLE; | |
357 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
358 | if (ret) | |
359 | return ret; | |
360 | DBG("disable handle %u", object->handle); | |
361 | return 0; | |
362 | } | |
363 | ||
4a6ca058 | 364 | int ustctl_start_session(int sock, int handle) |
57773204 | 365 | { |
61f02aea | 366 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
367 | |
368 | obj.handle = handle; | |
369 | return ustctl_enable(sock, &obj); | |
57773204 MD |
370 | } |
371 | ||
4a6ca058 | 372 | int ustctl_stop_session(int sock, int handle) |
57773204 | 373 | { |
61f02aea | 374 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
375 | |
376 | obj.handle = handle; | |
377 | return ustctl_disable(sock, &obj); | |
57773204 MD |
378 | } |
379 | ||
57773204 MD |
380 | int ustctl_tracepoint_list(int sock) |
381 | { | |
b115631f MD |
382 | struct ustcomm_ust_msg lum; |
383 | struct ustcomm_ust_reply lur; | |
384 | int ret, tp_list_handle; | |
385 | ||
386 | memset(&lum, 0, sizeof(lum)); | |
387 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
388 | lum.cmd = LTTNG_UST_TRACEPOINT_LIST; | |
389 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
390 | if (ret) | |
391 | return ret; | |
392 | tp_list_handle = lur.ret_val; | |
393 | DBG("received tracepoint list handle %u", tp_list_handle); | |
394 | return tp_list_handle; | |
395 | } | |
396 | ||
397 | int ustctl_tracepoint_list_get(int sock, int tp_list_handle, | |
398 | char iter[LTTNG_UST_SYM_NAME_LEN]) | |
399 | { | |
400 | struct ustcomm_ust_msg lum; | |
401 | struct ustcomm_ust_reply lur; | |
402 | int ret; | |
403 | ||
404 | memset(&lum, 0, sizeof(lum)); | |
405 | lum.handle = tp_list_handle; | |
406 | lum.cmd = LTTNG_UST_TRACEPOINT_LIST_GET; | |
407 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
408 | if (ret) | |
409 | return ret; | |
410 | DBG("received tracepoint list entry %s", lur.u.tracepoint_list_entry); | |
411 | memcpy(iter, lur.u.tracepoint_list_entry, LTTNG_UST_SYM_NAME_LEN); | |
412 | return 0; | |
57773204 MD |
413 | } |
414 | ||
415 | int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v) | |
416 | { | |
417 | struct ustcomm_ust_msg lum; | |
418 | struct ustcomm_ust_reply lur; | |
419 | int ret; | |
420 | ||
421 | memset(&lum, 0, sizeof(lum)); | |
422 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
423 | lum.cmd = LTTNG_UST_TRACER_VERSION; | |
424 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
425 | if (ret) | |
426 | return ret; | |
427 | memcpy(v, &lur.u.version, sizeof(*v)); | |
428 | DBG("received tracer version"); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | int ustctl_wait_quiescent(int sock) | |
433 | { | |
434 | struct ustcomm_ust_msg lum; | |
435 | struct ustcomm_ust_reply lur; | |
436 | int ret; | |
437 | ||
438 | memset(&lum, 0, sizeof(lum)); | |
439 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
440 | lum.cmd = LTTNG_UST_WAIT_QUIESCENT; | |
441 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
442 | if (ret) | |
443 | return ret; | |
444 | DBG("waited for quiescent state"); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate) | |
449 | { | |
450 | return -ENOSYS; | |
451 | } | |
452 | ||
453 | /* Buffer operations */ | |
454 | ||
455 | /* Map channel shm into process memory */ | |
38fae1d3 | 456 | struct lttng_ust_shm_handle *ustctl_map_channel(struct lttng_ust_object_data *chan_data) |
57773204 | 457 | { |
38fae1d3 | 458 | struct lttng_ust_shm_handle *handle; |
57773204 MD |
459 | struct channel *chan; |
460 | size_t chan_size; | |
c1fca457 | 461 | struct lttng_ust_lib_ring_buffer_config *config; |
7a784989 | 462 | int ret; |
57773204 MD |
463 | |
464 | handle = channel_handle_create(chan_data->shm_fd, | |
465 | chan_data->wait_fd, | |
466 | chan_data->memory_map_size); | |
467 | if (!handle) { | |
468 | ERR("create handle error"); | |
469 | return NULL; | |
470 | } | |
471 | /* | |
38fae1d3 | 472 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
473 | * of closing shm_fd and wait_fd. |
474 | */ | |
475 | chan_data->shm_fd = -1; | |
476 | chan_data->wait_fd = -1; | |
477 | ||
478 | /* | |
479 | * TODO: add consistency checks to be resilient if the | |
480 | * application try to feed us with incoherent channel structure | |
481 | * values. | |
482 | */ | |
483 | chan = shmp(handle, handle->chan); | |
484 | /* chan is object 0. This is hardcoded. */ | |
485 | chan_size = handle->table->objects[0].allocated_len; | |
486 | handle->shadow_chan = malloc(chan_size); | |
487 | if (!handle->shadow_chan) { | |
488 | channel_destroy(chan, handle, 1); | |
489 | return NULL; | |
490 | } | |
491 | memcpy(handle->shadow_chan, chan, chan_size); | |
bbc70d1b MD |
492 | /* |
493 | * The callback pointers in the producer are invalid in the | |
c1fca457 | 494 | * consumer. We need to look them up here. |
bbc70d1b | 495 | */ |
c1fca457 MD |
496 | config = &handle->shadow_chan->backend.config; |
497 | switch (config->client_type) { | |
498 | case LTTNG_CLIENT_METADATA: | |
499 | memcpy(&config->cb, lttng_client_callbacks_metadata, | |
500 | sizeof(config->cb)); | |
501 | break; | |
502 | case LTTNG_CLIENT_DISCARD: | |
503 | memcpy(&config->cb, lttng_client_callbacks_discard, | |
504 | sizeof(config->cb)); | |
505 | break; | |
506 | case LTTNG_CLIENT_OVERWRITE: | |
507 | memcpy(&config->cb, lttng_client_callbacks_overwrite, | |
508 | sizeof(config->cb)); | |
509 | break; | |
510 | default: | |
511 | ERR("Unknown client type %d", config->client_type); | |
512 | channel_destroy(chan, handle, 1); | |
513 | return NULL; | |
514 | } | |
7a784989 MD |
515 | /* Replace the object table pointer. */ |
516 | ret = munmap(handle->table->objects[0].memory_map, | |
517 | handle->table->objects[0].memory_map_size); | |
518 | if (ret) { | |
519 | perror("munmap"); | |
520 | assert(0); | |
521 | } | |
522 | handle->table->objects[0].memory_map = (char *) handle->shadow_chan; | |
523 | handle->table->objects[0].is_shadow = 1; | |
57773204 MD |
524 | return handle; |
525 | } | |
526 | ||
527 | /* Add stream to channel shm and map its shm into process memory */ | |
38fae1d3 | 528 | int ustctl_add_stream(struct lttng_ust_shm_handle *handle, |
61f02aea | 529 | struct lttng_ust_object_data *stream_data) |
57773204 MD |
530 | { |
531 | int ret; | |
532 | ||
533 | if (!stream_data->handle) | |
534 | return -ENOENT; | |
535 | /* map stream */ | |
536 | ret = channel_handle_add_stream(handle, | |
537 | stream_data->shm_fd, | |
538 | stream_data->wait_fd, | |
539 | stream_data->memory_map_size); | |
540 | if (ret) { | |
541 | ERR("add stream error\n"); | |
542 | return ret; | |
543 | } | |
544 | /* | |
38fae1d3 | 545 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
546 | * of closing shm_fd and wait_fd. |
547 | */ | |
548 | stream_data->shm_fd = -1; | |
549 | stream_data->wait_fd = -1; | |
550 | return 0; | |
551 | } | |
552 | ||
38fae1d3 | 553 | void ustctl_unmap_channel(struct lttng_ust_shm_handle *handle) |
5224b5c8 MD |
554 | { |
555 | struct channel *chan; | |
556 | ||
557 | chan = shmp(handle, handle->chan); | |
558 | channel_destroy(chan, handle, 1); | |
559 | } | |
560 | ||
4cfec15c | 561 | struct lttng_ust_lib_ring_buffer *ustctl_open_stream_read(struct lttng_ust_shm_handle *handle, |
6e922b24 MD |
562 | int cpu) |
563 | { | |
564 | struct channel *chan = handle->shadow_chan; | |
565 | int shm_fd, wait_fd; | |
566 | uint64_t memory_map_size; | |
4cfec15c | 567 | struct lttng_ust_lib_ring_buffer *buf; |
6e922b24 MD |
568 | int ret; |
569 | ||
570 | buf = channel_get_ring_buffer(&chan->backend.config, | |
571 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
572 | if (!buf) | |
573 | return NULL; | |
574 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
575 | if (ret) | |
576 | return NULL; | |
577 | return buf; | |
578 | } | |
579 | ||
38fae1d3 | 580 | void ustctl_close_stream_read(struct lttng_ust_shm_handle *handle, |
4cfec15c | 581 | struct lttng_ust_lib_ring_buffer *buf) |
6e922b24 MD |
582 | { |
583 | lib_ring_buffer_release_read(buf, handle, 1); | |
584 | } | |
585 | ||
57773204 MD |
586 | /* For mmap mode, readable without "get" operation */ |
587 | ||
38fae1d3 | 588 | void *ustctl_get_mmap_base(struct lttng_ust_shm_handle *handle, |
4cfec15c | 589 | struct lttng_ust_lib_ring_buffer *buf) |
9095efe9 MD |
590 | { |
591 | return shmp(handle, buf->backend.memory_map); | |
592 | } | |
593 | ||
57773204 | 594 | /* returns the length to mmap. */ |
38fae1d3 | 595 | int ustctl_get_mmap_len(struct lttng_ust_shm_handle *handle, |
4cfec15c | 596 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
597 | unsigned long *len) |
598 | { | |
599 | unsigned long mmap_buf_len; | |
600 | struct channel *chan = handle->shadow_chan; | |
601 | ||
602 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
603 | return -EINVAL; | |
604 | mmap_buf_len = chan->backend.buf_size; | |
605 | if (chan->backend.extra_reader_sb) | |
606 | mmap_buf_len += chan->backend.subbuf_size; | |
607 | if (mmap_buf_len > INT_MAX) | |
608 | return -EFBIG; | |
609 | *len = mmap_buf_len; | |
610 | return 0; | |
611 | } | |
612 | ||
613 | /* returns the maximum size for sub-buffers. */ | |
38fae1d3 | 614 | int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 615 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
616 | unsigned long *len) |
617 | { | |
618 | struct channel *chan = handle->shadow_chan; | |
619 | ||
620 | *len = chan->backend.subbuf_size; | |
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * For mmap mode, operate on the current packet (between get/put or | |
626 | * get_next/put_next). | |
627 | */ | |
628 | ||
629 | /* returns the offset of the subbuffer belonging to the mmap reader. */ | |
38fae1d3 | 630 | int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle, |
4cfec15c | 631 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *off) |
57773204 MD |
632 | { |
633 | struct channel *chan = handle->shadow_chan; | |
634 | unsigned long sb_bindex; | |
635 | ||
636 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
637 | return -EINVAL; | |
638 | sb_bindex = subbuffer_id_get_index(&chan->backend.config, | |
639 | buf->backend.buf_rsb.id); | |
640 | *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset; | |
641 | return 0; | |
642 | } | |
643 | ||
644 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 645 | int ustctl_get_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 646 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
647 | { |
648 | struct channel *chan = handle->shadow_chan; | |
649 | ||
650 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
651 | handle); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 656 | int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 657 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
658 | { |
659 | struct channel *chan = handle->shadow_chan; | |
660 | ||
661 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
662 | handle); | |
663 | *len = PAGE_ALIGN(*len); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | /* Get exclusive read access to the next sub-buffer that can be read. */ | |
38fae1d3 | 668 | int ustctl_get_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 669 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
670 | { |
671 | return lib_ring_buffer_get_next_subbuf(buf, handle); | |
672 | } | |
673 | ||
674 | ||
675 | /* Release exclusive sub-buffer access, move consumer forward. */ | |
38fae1d3 | 676 | int ustctl_put_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 677 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
678 | { |
679 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
680 | return 0; | |
681 | } | |
682 | ||
683 | /* snapshot */ | |
684 | ||
685 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
38fae1d3 | 686 | int ustctl_snapshot(struct lttng_ust_shm_handle *handle, |
4cfec15c | 687 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
688 | { |
689 | return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot, | |
690 | &buf->prod_snapshot, handle); | |
691 | } | |
692 | ||
693 | /* Get the consumer position (iteration start) */ | |
38fae1d3 | 694 | int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle *handle, |
4cfec15c | 695 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
696 | { |
697 | *pos = buf->cons_snapshot; | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /* Get the producer position (iteration end) */ | |
38fae1d3 | 702 | int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle *handle, |
4cfec15c | 703 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
704 | { |
705 | *pos = buf->prod_snapshot; | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* Get exclusive read access to the specified sub-buffer position */ | |
38fae1d3 | 710 | int ustctl_get_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 711 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
712 | { |
713 | return lib_ring_buffer_get_subbuf(buf, *pos, handle); | |
714 | } | |
715 | ||
716 | /* Release exclusive sub-buffer access */ | |
38fae1d3 | 717 | int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 718 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
719 | { |
720 | lib_ring_buffer_put_subbuf(buf, handle); | |
721 | return 0; | |
722 | } | |
723 | ||
02a15cfb | 724 | void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle, |
b52190f2 MD |
725 | struct lttng_ust_lib_ring_buffer *buf, |
726 | int producer_active) | |
57773204 | 727 | { |
b52190f2 MD |
728 | lib_ring_buffer_switch_slow(buf, |
729 | producer_active ? SWITCH_ACTIVE : SWITCH_FLUSH, | |
730 | handle); | |
57773204 | 731 | } |