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f4681817 MD |
1 | /* |
2 | * lttng-ust-abi.c | |
3 | * | |
4 | * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng UST ABI | |
7 | * | |
8 | * Mimic system calls for: | |
9 | * - session creation, returns an object descriptor or failure. | |
10 | * - channel creation, returns an object descriptor or failure. | |
11 | * - Operates on a session object descriptor | |
12 | * - Takes all channel options as parameters. | |
13 | * - stream get, returns an object descriptor or failure. | |
14 | * - Operates on a channel object descriptor. | |
15 | * - stream notifier get, returns an object descriptor or failure. | |
16 | * - Operates on a channel object descriptor. | |
17 | * - event creation, returns an object descriptor or failure. | |
18 | * - Operates on a channel object descriptor | |
19 | * - Takes an event name as parameter | |
20 | * - Takes an instrumentation source as parameter | |
21 | * - e.g. tracepoints, dynamic_probes... | |
22 | * - Takes instrumentation source specific arguments. | |
23 | * | |
24 | * Dual LGPL v2.1/GPL v2 license. | |
25 | */ | |
26 | ||
27 | #include <ust/lttng-ust-abi.h> | |
28 | #include <urcu/compiler.h> | |
29 | #include <urcu/list.h> | |
30 | #include <ust/lttng-events.h> | |
1dbfff0c | 31 | #include <ust/usterr-signal-safe.h> |
f4681817 MD |
32 | #include "ust/core.h" |
33 | #include "ltt-tracer.h" | |
34 | ||
35 | /* | |
36 | * Object descriptor table. Should be protected from concurrent access | |
37 | * by the caller. | |
38 | */ | |
39 | ||
40 | struct obj; | |
41 | ||
42 | struct objd_ops { | |
43 | long (*cmd)(int objd, unsigned int cmd, unsigned long arg); | |
44 | int (*release)(int objd); | |
45 | }; | |
46 | ||
47 | struct obj { | |
48 | union { | |
49 | struct { | |
50 | void *private_data; | |
51 | const struct objd_ops *ops; | |
52 | int f_count; | |
53 | } s; | |
54 | int freelist_next; /* offset freelist. end is -1. */ | |
55 | } u; | |
56 | }; | |
57 | ||
58 | struct objd_table { | |
59 | struct obj *array; | |
60 | unsigned int len, allocated_len; | |
61 | int freelist_head; /* offset freelist head. end is -1 */ | |
62 | }; | |
63 | ||
64 | static struct objd_table objd_table = { | |
65 | .freelist_head = -1, | |
66 | }; | |
67 | ||
68 | static | |
69 | int objd_alloc(void *private_data, const struct objd_ops *ops) | |
70 | { | |
71 | struct obj *obj; | |
72 | ||
73 | if (objd_table.freelist_head != -1) { | |
74 | obj = &objd_table.array[objd_table.freelist_head]; | |
75 | objd_table.freelist_head = obj->u.freelist_next; | |
76 | goto end; | |
77 | } | |
78 | ||
79 | if (objd_table.len >= objd_table.allocated_len) { | |
80 | unsigned int new_allocated_len, old_allocated_len; | |
81 | struct obj *new_table, *old_table; | |
82 | ||
83 | old_allocated_len = objd_table.allocated_len; | |
84 | old_table = objd_table.array; | |
85 | if (!old_allocated_len) | |
86 | new_allocated_len = 1; | |
87 | else | |
88 | new_allocated_len = old_allocated_len << 1; | |
89 | new_table = zmalloc(sizeof(struct obj) * new_allocated_len); | |
90 | if (!new_table) | |
91 | return -ENOMEM; | |
92 | memcpy(new_table, old_table, | |
93 | sizeof(struct obj) * old_allocated_len); | |
94 | free(old_table); | |
95 | objd_table.array = new_table; | |
96 | objd_table.allocated_len = new_allocated_len; | |
97 | } | |
98 | obj = &objd_table.array[objd_table.len]; | |
99 | objd_table.len++; | |
100 | end: | |
101 | obj->u.s.private_data = private_data; | |
102 | obj->u.s.ops = ops; | |
a4be8962 MD |
103 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
104 | /* count == 2 : allocated + hold ref */ | |
f4681817 MD |
105 | return obj - objd_table.array; |
106 | } | |
107 | ||
108 | static | |
109 | struct obj *_objd_get(int id) | |
110 | { | |
111 | if (id >= objd_table.len) | |
112 | return NULL; | |
a4be8962 MD |
113 | if (!objd_table.array[id].u.s.f_count) |
114 | return NULL; | |
f4681817 MD |
115 | return &objd_table.array[id]; |
116 | } | |
117 | ||
118 | static | |
119 | void *objd_private(int id) | |
120 | { | |
121 | struct obj *obj = _objd_get(id); | |
122 | assert(obj); | |
123 | return obj->u.s.private_data; | |
124 | } | |
125 | ||
126 | static | |
127 | void objd_set_private(int id, void *private_data) | |
128 | { | |
129 | struct obj *obj = _objd_get(id); | |
130 | assert(obj); | |
131 | obj->u.s.private_data = private_data; | |
132 | } | |
133 | ||
134 | static | |
135 | const struct objd_ops *objd_ops(int id) | |
136 | { | |
137 | struct obj *obj = _objd_get(id); | |
a4be8962 MD |
138 | if (!obj) |
139 | return NULL; | |
f4681817 MD |
140 | return obj->u.s.ops; |
141 | } | |
142 | ||
143 | static | |
144 | void objd_free(int id) | |
145 | { | |
146 | struct obj *obj = _objd_get(id); | |
147 | ||
148 | assert(obj); | |
149 | obj->u.freelist_next = objd_table.freelist_head; | |
150 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
151 | assert(obj->u.s.f_count == 1); |
152 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
153 | } |
154 | ||
155 | static | |
156 | void objd_ref(int id) | |
157 | { | |
158 | struct obj *obj = _objd_get(id); | |
159 | obj->u.s.f_count++; | |
160 | } | |
161 | ||
1ea11eab | 162 | int objd_unref(int id) |
f4681817 MD |
163 | { |
164 | struct obj *obj = _objd_get(id); | |
165 | ||
1ea11eab MD |
166 | if (!obj) |
167 | return -EINVAL; | |
a4be8962 MD |
168 | if (obj->u.s.f_count == 1) { |
169 | ERR("Reference counting error\n"); | |
170 | return -EINVAL; | |
171 | } | |
172 | if ((--obj->u.s.f_count) == 1) { | |
f4681817 | 173 | const struct objd_ops *ops = objd_ops(id); |
a4be8962 | 174 | |
f4681817 MD |
175 | if (ops->release) |
176 | ops->release(id); | |
177 | objd_free(id); | |
178 | } | |
1ea11eab | 179 | return 0; |
f4681817 MD |
180 | } |
181 | ||
182 | static | |
183 | void objd_table_destroy(void) | |
184 | { | |
a4be8962 MD |
185 | int i; |
186 | ||
187 | for (i = 0; i < objd_table.allocated_len; i++) { | |
188 | struct obj *obj = _objd_get(i); | |
189 | const struct objd_ops *ops; | |
190 | ||
191 | if (!obj) | |
192 | continue; | |
193 | ops = obj->u.s.ops; | |
194 | if (ops->release) | |
195 | ops->release(i); | |
196 | } | |
f4681817 MD |
197 | free(objd_table.array); |
198 | } | |
199 | ||
200 | /* | |
201 | * This is LTTng's own personal way to create an ABI for sessiond. | |
202 | * We send commands over a socket. | |
203 | */ | |
204 | ||
205 | static const struct objd_ops lttng_ops; | |
206 | static const struct objd_ops lttng_session_ops; | |
207 | static const struct objd_ops lttng_channel_ops; | |
208 | static const struct objd_ops lttng_metadata_ops; | |
209 | static const struct objd_ops lttng_event_ops; | |
210 | ||
211 | enum channel_type { | |
212 | PER_CPU_CHANNEL, | |
213 | METADATA_CHANNEL, | |
214 | }; | |
215 | ||
f4681817 MD |
216 | int lttng_abi_create_session(void) |
217 | { | |
218 | struct ltt_session *session; | |
219 | int session_objd, ret; | |
220 | ||
221 | session = ltt_session_create(); | |
222 | if (!session) | |
223 | return -ENOMEM; | |
224 | session_objd = objd_alloc(session, <tng_session_ops); | |
225 | if (session_objd < 0) { | |
226 | ret = session_objd; | |
227 | goto objd_error; | |
228 | } | |
229 | session->objd = session_objd; | |
230 | return session_objd; | |
231 | ||
232 | objd_error: | |
233 | ltt_session_destroy(session); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | #if 0 | |
238 | static | |
239 | int lttng_abi_tracepoint_list(void) | |
240 | { | |
241 | int list_objd, ret; | |
242 | ||
243 | /* TODO: Create list private data */ | |
244 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops); | |
245 | if (list_objd < 0) { | |
246 | ret = list_objd; | |
247 | goto objd_error; | |
248 | } | |
249 | ||
250 | return list_objd; | |
251 | ||
252 | objd_error: | |
253 | return ret; | |
254 | } | |
255 | #endif //0 | |
256 | ||
257 | static | |
258 | long lttng_abi_tracer_version(int objd, | |
259 | struct lttng_ust_tracer_version *v) | |
260 | { | |
261 | v->version = LTTNG_UST_VERSION; | |
262 | v->patchlevel = LTTNG_UST_PATCHLEVEL; | |
263 | v->sublevel = LTTNG_UST_SUBLEVEL; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static | |
268 | long lttng_abi_add_context(int objd, | |
269 | struct lttng_ust_context *context_param, | |
270 | struct lttng_ctx **ctx, struct ltt_session *session) | |
271 | { | |
272 | if (session->been_active) | |
273 | return -EPERM; | |
274 | ||
275 | switch (context_param->ctx) { | |
276 | case LTTNG_UST_CONTEXT_VTID: | |
438bc215 | 277 | //TODO return lttng_add_vtid_to_ctx(ctx); |
f4681817 MD |
278 | default: |
279 | return -EINVAL; | |
280 | } | |
281 | } | |
282 | ||
283 | /** | |
284 | * lttng_cmd - lttng control through socket commands | |
285 | * | |
286 | * @objd: the object descriptor | |
287 | * @cmd: the command | |
288 | * @arg: command arg | |
289 | * | |
290 | * This descriptor implements lttng commands: | |
291 | * LTTNG_UST_SESSION | |
292 | * Returns a LTTng trace session object descriptor | |
293 | * LTTNG_UST_TRACER_VERSION | |
294 | * Returns the LTTng kernel tracer version | |
295 | * LTTNG_UST_TRACEPOINT_LIST | |
296 | * Returns a file descriptor listing available tracepoints | |
297 | * LTTNG_UST_WAIT_QUIESCENT | |
298 | * Returns after all previously running probes have completed | |
299 | * | |
300 | * The returned session will be deleted when its file descriptor is closed. | |
301 | */ | |
302 | static | |
303 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg) | |
304 | { | |
305 | switch (cmd) { | |
306 | case LTTNG_UST_SESSION: | |
307 | return lttng_abi_create_session(); | |
308 | case LTTNG_UST_TRACER_VERSION: | |
309 | return lttng_abi_tracer_version(objd, | |
310 | (struct lttng_ust_tracer_version *) arg); | |
311 | case LTTNG_UST_TRACEPOINT_LIST: | |
312 | return -ENOSYS; //TODO | |
313 | //return lttng_abi_tracepoint_list(); | |
314 | case LTTNG_UST_WAIT_QUIESCENT: | |
315 | synchronize_trace(); | |
316 | return 0; | |
317 | default: | |
318 | return -EINVAL; | |
319 | } | |
320 | } | |
321 | ||
322 | static const struct objd_ops lttng_ops = { | |
323 | .cmd = lttng_cmd, | |
324 | }; | |
325 | ||
326 | /* | |
327 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
328 | * error, but cannot return any error, because the channel information is | |
329 | * invariant. | |
330 | */ | |
331 | static | |
332 | void lttng_metadata_create_events(int channel_objd) | |
333 | { | |
334 | struct ltt_channel *channel = objd_private(channel_objd); | |
335 | static struct lttng_ust_event metadata_params = { | |
336 | .instrumentation = LTTNG_UST_TRACEPOINT, | |
337 | .name = "lttng_metadata", | |
338 | }; | |
339 | struct ltt_event *event; | |
340 | int ret; | |
341 | ||
342 | /* | |
343 | * We tolerate no failure path after event creation. It will stay | |
344 | * invariant for the rest of the session. | |
345 | */ | |
346 | event = ltt_event_create(channel, &metadata_params, NULL); | |
347 | if (!event) { | |
348 | ret = -EINVAL; | |
349 | goto create_error; | |
350 | } | |
351 | return; | |
352 | ||
353 | create_error: | |
354 | WARN_ON(1); | |
355 | return; /* not allowed to return error */ | |
356 | } | |
357 | ||
358 | static | |
359 | int lttng_abi_create_channel(int session_objd, | |
360 | struct lttng_ust_channel *chan_param, | |
361 | enum channel_type channel_type) | |
362 | { | |
363 | struct ltt_session *session = objd_private(session_objd); | |
364 | const struct objd_ops *ops; | |
365 | const char *transport_name; | |
366 | struct ltt_channel *chan; | |
367 | int chan_objd; | |
368 | int ret = 0; | |
369 | ||
370 | chan_objd = objd_alloc(NULL, <tng_channel_ops); | |
371 | if (chan_objd < 0) { | |
372 | ret = chan_objd; | |
373 | goto objd_error; | |
374 | } | |
375 | switch (channel_type) { | |
376 | case PER_CPU_CHANNEL: | |
377 | if (chan_param->output == LTTNG_UST_MMAP) { | |
378 | transport_name = chan_param->overwrite ? | |
379 | "relay-overwrite-mmap" : "relay-discard-mmap"; | |
380 | } else { | |
381 | return -EINVAL; | |
382 | } | |
383 | ops = <tng_channel_ops; | |
384 | break; | |
385 | case METADATA_CHANNEL: | |
386 | if (chan_param->output == LTTNG_UST_MMAP) | |
387 | transport_name = "relay-metadata-mmap"; | |
388 | else | |
389 | return -EINVAL; | |
390 | ops = <tng_metadata_ops; | |
391 | break; | |
392 | default: | |
393 | transport_name = "<unknown>"; | |
394 | break; | |
395 | } | |
396 | /* | |
397 | * We tolerate no failure path after channel creation. It will stay | |
398 | * invariant for the rest of the session. | |
399 | */ | |
400 | chan = ltt_channel_create(session, transport_name, NULL, | |
401 | chan_param->subbuf_size, | |
402 | chan_param->num_subbuf, | |
403 | chan_param->switch_timer_interval, | |
404 | chan_param->read_timer_interval); | |
405 | if (!chan) { | |
406 | ret = -EINVAL; | |
407 | goto chan_error; | |
408 | } | |
409 | objd_set_private(chan_objd, chan); | |
410 | chan->objd = chan_objd; | |
411 | if (channel_type == METADATA_CHANNEL) { | |
412 | session->metadata = chan; | |
413 | lttng_metadata_create_events(chan_objd); | |
414 | } | |
415 | ||
416 | /* The channel created holds a reference on the session */ | |
417 | objd_ref(session_objd); | |
418 | ||
419 | return chan_objd; | |
420 | ||
421 | chan_error: | |
1ea11eab MD |
422 | { |
423 | int err; | |
424 | ||
425 | err = objd_unref(chan_objd); | |
426 | assert(!err); | |
427 | } | |
f4681817 MD |
428 | objd_error: |
429 | return ret; | |
430 | } | |
431 | ||
432 | /** | |
433 | * lttng_session_cmd - lttng session object command | |
434 | * | |
435 | * @obj: the object | |
436 | * @cmd: the command | |
437 | * @arg: command arg | |
438 | * | |
439 | * This descriptor implements lttng commands: | |
440 | * LTTNG_UST_CHANNEL | |
441 | * Returns a LTTng channel object descriptor | |
442 | * LTTNG_UST_ENABLE | |
443 | * Enables tracing for a session (weak enable) | |
444 | * LTTNG_UST_DISABLE | |
445 | * Disables tracing for a session (strong disable) | |
446 | * LTTNG_UST_METADATA | |
447 | * Returns a LTTng metadata object descriptor | |
448 | * | |
449 | * The returned channel will be deleted when its file descriptor is closed. | |
450 | */ | |
451 | static | |
452 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg) | |
453 | { | |
454 | struct ltt_session *session = objd_private(objd); | |
455 | ||
456 | switch (cmd) { | |
457 | case LTTNG_UST_CHANNEL: | |
458 | return lttng_abi_create_channel(objd, | |
459 | (struct lttng_ust_channel *) arg, | |
460 | PER_CPU_CHANNEL); | |
461 | case LTTNG_UST_SESSION_START: | |
462 | case LTTNG_UST_ENABLE: | |
463 | return ltt_session_enable(session); | |
464 | case LTTNG_UST_SESSION_STOP: | |
465 | case LTTNG_UST_DISABLE: | |
466 | return ltt_session_disable(session); | |
467 | case LTTNG_UST_METADATA: | |
468 | return lttng_abi_create_channel(objd, | |
469 | (struct lttng_ust_channel *) arg, | |
470 | METADATA_CHANNEL); | |
471 | default: | |
472 | return -EINVAL; | |
473 | } | |
474 | } | |
475 | ||
476 | /* | |
477 | * Called when the last file reference is dropped. | |
478 | * | |
479 | * Big fat note: channels and events are invariant for the whole session after | |
480 | * their creation. So this session destruction also destroys all channel and | |
481 | * event structures specific to this session (they are not destroyed when their | |
482 | * individual file is released). | |
483 | */ | |
484 | static | |
1ea11eab | 485 | int lttng_release_session(int objd) |
f4681817 MD |
486 | { |
487 | struct ltt_session *session = objd_private(objd); | |
488 | ||
1ea11eab | 489 | if (session) { |
f4681817 | 490 | ltt_session_destroy(session); |
1ea11eab MD |
491 | return 0; |
492 | } else { | |
493 | return -EINVAL; | |
494 | } | |
f4681817 MD |
495 | } |
496 | ||
497 | static const struct objd_ops lttng_session_ops = { | |
1ea11eab | 498 | .release = lttng_release_session, |
f4681817 MD |
499 | .cmd = lttng_session_cmd, |
500 | }; | |
501 | ||
502 | #if 0 | |
503 | static | |
504 | int lttng_abi_open_stream(int channel_objd) | |
505 | { | |
506 | struct ltt_channel *channel = objd_private(channel_objd); | |
507 | struct lib_ring_buffer *buf; | |
508 | int stream_objd, ret; | |
509 | ||
510 | buf = channel->ops->buffer_read_open(channel->chan); | |
511 | if (!buf) | |
512 | return -ENOENT; | |
513 | ||
514 | stream_objd = objd_alloc(buf, &lib_ring_buffer_objd_ops); | |
515 | if (stream_objd < 0) { | |
516 | ret = stream_objd; | |
517 | goto objd_error; | |
518 | } | |
519 | /* | |
520 | * The stream holds a reference to the channel within the generic ring | |
521 | * buffer library, so no need to hold a refcount on the channel and | |
522 | * session files here. | |
523 | */ | |
524 | return stream_objd; | |
525 | ||
526 | objd_error: | |
527 | channel->ops->buffer_read_close(buf); | |
528 | return ret; | |
529 | } | |
530 | #endif //0 | |
531 | ||
532 | static | |
533 | int lttng_abi_create_event(int channel_objd, | |
534 | struct lttng_ust_event *event_param) | |
535 | { | |
536 | struct ltt_channel *channel = objd_private(channel_objd); | |
537 | struct ltt_event *event; | |
538 | int event_objd, ret; | |
539 | ||
540 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
541 | event_objd = objd_alloc(NULL, <tng_event_ops); | |
542 | if (event_objd < 0) { | |
543 | ret = event_objd; | |
544 | goto objd_error; | |
545 | } | |
546 | /* | |
547 | * We tolerate no failure path after event creation. It will stay | |
548 | * invariant for the rest of the session. | |
549 | */ | |
550 | event = ltt_event_create(channel, event_param, NULL); | |
551 | if (!event) { | |
552 | ret = -EINVAL; | |
553 | goto event_error; | |
554 | } | |
555 | objd_set_private(event_objd, event); | |
556 | /* The event holds a reference on the channel */ | |
557 | objd_ref(channel_objd); | |
558 | return event_objd; | |
559 | ||
560 | event_error: | |
1ea11eab MD |
561 | { |
562 | int err; | |
563 | ||
564 | err = objd_unref(event_objd); | |
565 | assert(!err); | |
566 | } | |
f4681817 MD |
567 | objd_error: |
568 | return ret; | |
569 | } | |
570 | ||
571 | /** | |
572 | * lttng_channel_cmd - lttng control through object descriptors | |
573 | * | |
574 | * @objd: the object descriptor | |
575 | * @cmd: the command | |
576 | * @arg: command arg | |
577 | * | |
578 | * This object descriptor implements lttng commands: | |
579 | * LTTNG_UST_STREAM | |
580 | * Returns an event stream object descriptor or failure. | |
581 | * (typically, one event stream records events from one CPU) | |
582 | * LTTNG_UST_EVENT | |
583 | * Returns an event object descriptor or failure. | |
584 | * LTTNG_UST_CONTEXT | |
585 | * Prepend a context field to each event in the channel | |
586 | * LTTNG_UST_ENABLE | |
587 | * Enable recording for events in this channel (weak enable) | |
588 | * LTTNG_UST_DISABLE | |
589 | * Disable recording for events in this channel (strong disable) | |
590 | * | |
591 | * Channel and event file descriptors also hold a reference on the session. | |
592 | */ | |
593 | static | |
594 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg) | |
595 | { | |
596 | struct ltt_channel *channel = objd_private(objd); | |
597 | ||
598 | switch (cmd) { | |
599 | case LTTNG_UST_STREAM: | |
600 | return -ENOSYS; //TODO | |
601 | //return lttng_abi_open_stream(objd); | |
602 | case LTTNG_UST_EVENT: | |
603 | return lttng_abi_create_event(objd, (struct lttng_ust_event *) arg); | |
604 | case LTTNG_UST_CONTEXT: | |
605 | return lttng_abi_add_context(objd, | |
606 | (struct lttng_ust_context *) arg, | |
607 | &channel->ctx, channel->session); | |
608 | case LTTNG_UST_ENABLE: | |
609 | return ltt_channel_enable(channel); | |
610 | case LTTNG_UST_DISABLE: | |
611 | return ltt_channel_disable(channel); | |
612 | default: | |
613 | return -EINVAL; | |
614 | } | |
615 | } | |
616 | ||
617 | /** | |
618 | * lttng_metadata_cmd - lttng control through object descriptors | |
619 | * | |
620 | * @objd: the object descriptor | |
621 | * @cmd: the command | |
622 | * @arg: command arg | |
623 | * | |
624 | * This object descriptor implements lttng commands: | |
625 | * LTTNG_UST_STREAM | |
626 | * Returns an event stream file descriptor or failure. | |
627 | * | |
628 | * Channel and event file descriptors also hold a reference on the session. | |
629 | */ | |
630 | static | |
631 | long lttng_metadata_cmd(int objd, unsigned int cmd, unsigned long arg) | |
632 | { | |
633 | switch (cmd) { | |
634 | case LTTNG_UST_STREAM: | |
635 | return -ENOSYS; //TODO | |
636 | //return lttng_abi_open_stream(objd); | |
637 | default: | |
638 | return -EINVAL; | |
639 | } | |
640 | } | |
641 | ||
642 | #if 0 | |
643 | /** | |
644 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
645 | * | |
646 | * @file: the file | |
647 | * @wait: poll table | |
648 | */ | |
649 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) | |
650 | { | |
651 | struct ltt_channel *channel = file->private_data; | |
652 | unsigned int mask = 0; | |
653 | ||
654 | if (file->f_mode & FMODE_READ) { | |
655 | poll_wait_set_exclusive(wait); | |
656 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), | |
657 | wait); | |
658 | ||
659 | if (channel->ops->is_disabled(channel->chan)) | |
660 | return POLLERR; | |
661 | if (channel->ops->is_finalized(channel->chan)) | |
662 | return POLLHUP; | |
663 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) | |
664 | return POLLIN | POLLRDNORM; | |
665 | return 0; | |
666 | } | |
667 | return mask; | |
668 | ||
669 | } | |
670 | #endif //0 | |
671 | ||
672 | static | |
673 | int lttng_channel_release(int objd) | |
674 | { | |
675 | struct ltt_channel *channel = objd_private(objd); | |
676 | ||
677 | if (channel) | |
1ea11eab | 678 | return objd_unref(channel->session->objd); |
f4681817 MD |
679 | return 0; |
680 | } | |
681 | ||
682 | static const struct objd_ops lttng_channel_ops = { | |
683 | .release = lttng_channel_release, | |
684 | //.poll = lttng_channel_poll, | |
685 | .cmd = lttng_channel_cmd, | |
686 | }; | |
687 | ||
688 | static const struct objd_ops lttng_metadata_ops = { | |
689 | .release = lttng_channel_release, | |
690 | .cmd = lttng_metadata_cmd, | |
691 | }; | |
692 | ||
693 | /** | |
694 | * lttng_event_cmd - lttng control through object descriptors | |
695 | * | |
696 | * @objd: the object descriptor | |
697 | * @cmd: the command | |
698 | * @arg: command arg | |
699 | * | |
700 | * This object descriptor implements lttng commands: | |
701 | * LTTNG_UST_CONTEXT | |
702 | * Prepend a context field to each record of this event | |
703 | * LTTNG_UST_ENABLE | |
704 | * Enable recording for this event (weak enable) | |
705 | * LTTNG_UST_DISABLE | |
706 | * Disable recording for this event (strong disable) | |
707 | */ | |
708 | static | |
709 | long lttng_event_cmd(int objd, unsigned int cmd, unsigned long arg) | |
710 | { | |
711 | struct ltt_event *event = objd_private(objd); | |
712 | ||
713 | switch (cmd) { | |
714 | case LTTNG_UST_CONTEXT: | |
715 | return lttng_abi_add_context(objd, | |
716 | (struct lttng_ust_context *) arg, | |
717 | &event->ctx, event->chan->session); | |
718 | case LTTNG_UST_ENABLE: | |
719 | return ltt_event_enable(event); | |
720 | case LTTNG_UST_DISABLE: | |
721 | return ltt_event_disable(event); | |
722 | default: | |
723 | return -EINVAL; | |
724 | } | |
725 | } | |
726 | ||
727 | static | |
728 | int lttng_event_release(int objd) | |
729 | { | |
730 | struct ltt_event *event = objd_private(objd); | |
731 | ||
732 | if (event) | |
1ea11eab | 733 | return objd_unref(event->chan->objd); |
f4681817 MD |
734 | return 0; |
735 | } | |
736 | ||
737 | /* TODO: filter control ioctl */ | |
738 | static const struct objd_ops lttng_event_ops = { | |
739 | .release = lttng_event_release, | |
740 | .cmd = lttng_event_cmd, | |
741 | }; | |
742 | ||
b35d179d | 743 | void lttng_ust_abi_exit(void) |
f4681817 | 744 | { |
f4681817 MD |
745 | objd_table_destroy(); |
746 | } |