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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 | ||
4318ae1b | 27 | #include <lttng/ust-abi.h> |
f4681817 MD |
28 | #include <urcu/compiler.h> |
29 | #include <urcu/list.h> | |
4318ae1b MD |
30 | #include <lttng/ust-events.h> |
31 | #include <lttng/usterr-signal-safe.h> | |
32 | #include "lttng/core.h" | |
f4681817 MD |
33 | #include "ltt-tracer.h" |
34 | ||
51489cad MD |
35 | static |
36 | int lttng_abi_tracepoint_list(void); | |
37 | ||
f4681817 MD |
38 | /* |
39 | * Object descriptor table. Should be protected from concurrent access | |
40 | * by the caller. | |
41 | */ | |
42 | ||
b61ce3b2 | 43 | struct lttng_ust_obj { |
f4681817 MD |
44 | union { |
45 | struct { | |
46 | void *private_data; | |
b61ce3b2 | 47 | const struct lttng_ust_objd_ops *ops; |
f4681817 MD |
48 | int f_count; |
49 | } s; | |
50 | int freelist_next; /* offset freelist. end is -1. */ | |
51 | } u; | |
52 | }; | |
53 | ||
b61ce3b2 MD |
54 | struct lttng_ust_objd_table { |
55 | struct lttng_ust_obj *array; | |
f4681817 MD |
56 | unsigned int len, allocated_len; |
57 | int freelist_head; /* offset freelist head. end is -1 */ | |
58 | }; | |
59 | ||
b61ce3b2 | 60 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
61 | .freelist_head = -1, |
62 | }; | |
63 | ||
64 | static | |
b61ce3b2 | 65 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops) |
f4681817 | 66 | { |
b61ce3b2 | 67 | struct lttng_ust_obj *obj; |
f4681817 MD |
68 | |
69 | if (objd_table.freelist_head != -1) { | |
70 | obj = &objd_table.array[objd_table.freelist_head]; | |
71 | objd_table.freelist_head = obj->u.freelist_next; | |
72 | goto end; | |
73 | } | |
74 | ||
75 | if (objd_table.len >= objd_table.allocated_len) { | |
76 | unsigned int new_allocated_len, old_allocated_len; | |
b61ce3b2 | 77 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
78 | |
79 | old_allocated_len = objd_table.allocated_len; | |
80 | old_table = objd_table.array; | |
81 | if (!old_allocated_len) | |
82 | new_allocated_len = 1; | |
83 | else | |
84 | new_allocated_len = old_allocated_len << 1; | |
b61ce3b2 | 85 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
86 | if (!new_table) |
87 | return -ENOMEM; | |
88 | memcpy(new_table, old_table, | |
b61ce3b2 | 89 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
90 | free(old_table); |
91 | objd_table.array = new_table; | |
92 | objd_table.allocated_len = new_allocated_len; | |
93 | } | |
94 | obj = &objd_table.array[objd_table.len]; | |
95 | objd_table.len++; | |
96 | end: | |
97 | obj->u.s.private_data = private_data; | |
98 | obj->u.s.ops = ops; | |
a4be8962 MD |
99 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
100 | /* count == 2 : allocated + hold ref */ | |
f4681817 MD |
101 | return obj - objd_table.array; |
102 | } | |
103 | ||
104 | static | |
b61ce3b2 | 105 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
106 | { |
107 | if (id >= objd_table.len) | |
108 | return NULL; | |
a4be8962 MD |
109 | if (!objd_table.array[id].u.s.f_count) |
110 | return NULL; | |
f4681817 MD |
111 | return &objd_table.array[id]; |
112 | } | |
113 | ||
114 | static | |
115 | void *objd_private(int id) | |
116 | { | |
b61ce3b2 | 117 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
118 | assert(obj); |
119 | return obj->u.s.private_data; | |
120 | } | |
121 | ||
122 | static | |
123 | void objd_set_private(int id, void *private_data) | |
124 | { | |
b61ce3b2 | 125 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
126 | assert(obj); |
127 | obj->u.s.private_data = private_data; | |
128 | } | |
129 | ||
b61ce3b2 | 130 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 131 | { |
b61ce3b2 | 132 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 133 | |
a4be8962 MD |
134 | if (!obj) |
135 | return NULL; | |
f4681817 MD |
136 | return obj->u.s.ops; |
137 | } | |
138 | ||
139 | static | |
140 | void objd_free(int id) | |
141 | { | |
b61ce3b2 | 142 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
143 | |
144 | assert(obj); | |
145 | obj->u.freelist_next = objd_table.freelist_head; | |
146 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
147 | assert(obj->u.s.f_count == 1); |
148 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
149 | } |
150 | ||
151 | static | |
152 | void objd_ref(int id) | |
153 | { | |
b61ce3b2 | 154 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
155 | obj->u.s.f_count++; |
156 | } | |
157 | ||
d4419b81 | 158 | int lttng_ust_objd_unref(int id) |
f4681817 | 159 | { |
b61ce3b2 | 160 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 161 | |
1ea11eab MD |
162 | if (!obj) |
163 | return -EINVAL; | |
a4be8962 MD |
164 | if (obj->u.s.f_count == 1) { |
165 | ERR("Reference counting error\n"); | |
166 | return -EINVAL; | |
167 | } | |
168 | if ((--obj->u.s.f_count) == 1) { | |
b61ce3b2 | 169 | const struct lttng_ust_objd_ops *ops = objd_ops(id); |
a4be8962 | 170 | |
f4681817 MD |
171 | if (ops->release) |
172 | ops->release(id); | |
173 | objd_free(id); | |
174 | } | |
1ea11eab | 175 | return 0; |
f4681817 MD |
176 | } |
177 | ||
178 | static | |
179 | void objd_table_destroy(void) | |
180 | { | |
a4be8962 MD |
181 | int i; |
182 | ||
fb50c39d | 183 | for (i = 0; i < objd_table.allocated_len; i++) |
d4419b81 | 184 | (void) lttng_ust_objd_unref(i); |
f4681817 | 185 | free(objd_table.array); |
02fb3381 MD |
186 | objd_table.array = NULL; |
187 | objd_table.len = 0; | |
188 | objd_table.allocated_len = 0; | |
17dfb34b | 189 | objd_table.freelist_head = -1; |
f4681817 MD |
190 | } |
191 | ||
192 | /* | |
193 | * This is LTTng's own personal way to create an ABI for sessiond. | |
194 | * We send commands over a socket. | |
195 | */ | |
196 | ||
b61ce3b2 MD |
197 | static const struct lttng_ust_objd_ops lttng_ops; |
198 | static const struct lttng_ust_objd_ops lttng_session_ops; | |
199 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
200 | static const struct lttng_ust_objd_ops lttng_metadata_ops; | |
201 | static const struct lttng_ust_objd_ops lttng_event_ops; | |
202 | static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops; | |
51489cad | 203 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
f4681817 MD |
204 | |
205 | enum channel_type { | |
206 | PER_CPU_CHANNEL, | |
207 | METADATA_CHANNEL, | |
208 | }; | |
209 | ||
46050b1a MD |
210 | int lttng_abi_create_root_handle(void) |
211 | { | |
212 | int root_handle; | |
213 | ||
214 | root_handle = objd_alloc(NULL, <tng_ops); | |
46050b1a MD |
215 | return root_handle; |
216 | } | |
217 | ||
818173b9 | 218 | static |
f4681817 MD |
219 | int lttng_abi_create_session(void) |
220 | { | |
221 | struct ltt_session *session; | |
222 | int session_objd, ret; | |
223 | ||
224 | session = ltt_session_create(); | |
225 | if (!session) | |
226 | return -ENOMEM; | |
227 | session_objd = objd_alloc(session, <tng_session_ops); | |
228 | if (session_objd < 0) { | |
229 | ret = session_objd; | |
230 | goto objd_error; | |
231 | } | |
232 | session->objd = session_objd; | |
233 | return session_objd; | |
234 | ||
235 | objd_error: | |
236 | ltt_session_destroy(session); | |
237 | return ret; | |
238 | } | |
239 | ||
f4681817 MD |
240 | static |
241 | long lttng_abi_tracer_version(int objd, | |
242 | struct lttng_ust_tracer_version *v) | |
243 | { | |
244 | v->version = LTTNG_UST_VERSION; | |
245 | v->patchlevel = LTTNG_UST_PATCHLEVEL; | |
246 | v->sublevel = LTTNG_UST_SUBLEVEL; | |
247 | return 0; | |
248 | } | |
249 | ||
250 | static | |
251 | long lttng_abi_add_context(int objd, | |
252 | struct lttng_ust_context *context_param, | |
253 | struct lttng_ctx **ctx, struct ltt_session *session) | |
254 | { | |
255 | if (session->been_active) | |
256 | return -EPERM; | |
257 | ||
258 | switch (context_param->ctx) { | |
8de38cf7 MD |
259 | case LTTNG_UST_CONTEXT_PTHREAD_ID: |
260 | return lttng_add_pthread_id_to_ctx(ctx); | |
3b402b40 MD |
261 | case LTTNG_UST_CONTEXT_VTID: |
262 | return lttng_add_vtid_to_ctx(ctx); | |
c1ef86f0 MD |
263 | case LTTNG_UST_CONTEXT_VPID: |
264 | return lttng_add_vpid_to_ctx(ctx); | |
4847e9bb MD |
265 | case LTTNG_UST_CONTEXT_PROCNAME: |
266 | return lttng_add_procname_to_ctx(ctx); | |
f4681817 MD |
267 | default: |
268 | return -EINVAL; | |
269 | } | |
270 | } | |
271 | ||
272 | /** | |
273 | * lttng_cmd - lttng control through socket commands | |
274 | * | |
275 | * @objd: the object descriptor | |
276 | * @cmd: the command | |
277 | * @arg: command arg | |
278 | * | |
279 | * This descriptor implements lttng commands: | |
280 | * LTTNG_UST_SESSION | |
281 | * Returns a LTTng trace session object descriptor | |
282 | * LTTNG_UST_TRACER_VERSION | |
283 | * Returns the LTTng kernel tracer version | |
284 | * LTTNG_UST_TRACEPOINT_LIST | |
285 | * Returns a file descriptor listing available tracepoints | |
286 | * LTTNG_UST_WAIT_QUIESCENT | |
287 | * Returns after all previously running probes have completed | |
288 | * | |
289 | * The returned session will be deleted when its file descriptor is closed. | |
290 | */ | |
291 | static | |
292 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg) | |
293 | { | |
294 | switch (cmd) { | |
295 | case LTTNG_UST_SESSION: | |
296 | return lttng_abi_create_session(); | |
297 | case LTTNG_UST_TRACER_VERSION: | |
298 | return lttng_abi_tracer_version(objd, | |
299 | (struct lttng_ust_tracer_version *) arg); | |
300 | case LTTNG_UST_TRACEPOINT_LIST: | |
51489cad | 301 | return lttng_abi_tracepoint_list(); |
f4681817 MD |
302 | case LTTNG_UST_WAIT_QUIESCENT: |
303 | synchronize_trace(); | |
304 | return 0; | |
305 | default: | |
306 | return -EINVAL; | |
307 | } | |
308 | } | |
309 | ||
b61ce3b2 | 310 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
311 | .cmd = lttng_cmd, |
312 | }; | |
313 | ||
314 | /* | |
315 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
316 | * error, but cannot return any error, because the channel information is | |
317 | * invariant. | |
318 | */ | |
319 | static | |
320 | void lttng_metadata_create_events(int channel_objd) | |
321 | { | |
322 | struct ltt_channel *channel = objd_private(channel_objd); | |
323 | static struct lttng_ust_event metadata_params = { | |
324 | .instrumentation = LTTNG_UST_TRACEPOINT, | |
325 | .name = "lttng_metadata", | |
326 | }; | |
327 | struct ltt_event *event; | |
f4681817 MD |
328 | |
329 | /* | |
330 | * We tolerate no failure path after event creation. It will stay | |
331 | * invariant for the rest of the session. | |
332 | */ | |
333 | event = ltt_event_create(channel, &metadata_params, NULL); | |
334 | if (!event) { | |
f4681817 MD |
335 | goto create_error; |
336 | } | |
337 | return; | |
338 | ||
339 | create_error: | |
340 | WARN_ON(1); | |
341 | return; /* not allowed to return error */ | |
342 | } | |
343 | ||
f4681817 MD |
344 | int lttng_abi_create_channel(int session_objd, |
345 | struct lttng_ust_channel *chan_param, | |
346 | enum channel_type channel_type) | |
347 | { | |
348 | struct ltt_session *session = objd_private(session_objd); | |
b61ce3b2 | 349 | const struct lttng_ust_objd_ops *ops; |
f4681817 MD |
350 | const char *transport_name; |
351 | struct ltt_channel *chan; | |
352 | int chan_objd; | |
353 | int ret = 0; | |
d028eddb | 354 | struct ltt_channel chan_priv_init; |
f4681817 | 355 | |
f4681817 MD |
356 | switch (channel_type) { |
357 | case PER_CPU_CHANNEL: | |
358 | if (chan_param->output == LTTNG_UST_MMAP) { | |
359 | transport_name = chan_param->overwrite ? | |
360 | "relay-overwrite-mmap" : "relay-discard-mmap"; | |
361 | } else { | |
362 | return -EINVAL; | |
363 | } | |
364 | ops = <tng_channel_ops; | |
365 | break; | |
366 | case METADATA_CHANNEL: | |
367 | if (chan_param->output == LTTNG_UST_MMAP) | |
368 | transport_name = "relay-metadata-mmap"; | |
369 | else | |
370 | return -EINVAL; | |
371 | ops = <tng_metadata_ops; | |
372 | break; | |
373 | default: | |
374 | transport_name = "<unknown>"; | |
fe38d4af MD |
375 | return -EINVAL; |
376 | } | |
377 | chan_objd = objd_alloc(NULL, ops); | |
378 | if (chan_objd < 0) { | |
379 | ret = chan_objd; | |
380 | goto objd_error; | |
f4681817 | 381 | } |
d028eddb MD |
382 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
383 | /* Copy of session UUID for consumer (availability through shm) */ | |
384 | memcpy(chan_priv_init.uuid, session->uuid, sizeof(session->uuid)); | |
385 | ||
f4681817 MD |
386 | /* |
387 | * We tolerate no failure path after channel creation. It will stay | |
388 | * invariant for the rest of the session. | |
389 | */ | |
390 | chan = ltt_channel_create(session, transport_name, NULL, | |
391 | chan_param->subbuf_size, | |
392 | chan_param->num_subbuf, | |
393 | chan_param->switch_timer_interval, | |
193183fb MD |
394 | chan_param->read_timer_interval, |
395 | &chan_param->shm_fd, | |
396 | &chan_param->wait_fd, | |
d028eddb MD |
397 | &chan_param->memory_map_size, |
398 | &chan_priv_init); | |
f4681817 MD |
399 | if (!chan) { |
400 | ret = -EINVAL; | |
401 | goto chan_error; | |
402 | } | |
403 | objd_set_private(chan_objd, chan); | |
404 | chan->objd = chan_objd; | |
405 | if (channel_type == METADATA_CHANNEL) { | |
406 | session->metadata = chan; | |
407 | lttng_metadata_create_events(chan_objd); | |
408 | } | |
f4681817 MD |
409 | /* The channel created holds a reference on the session */ |
410 | objd_ref(session_objd); | |
411 | ||
412 | return chan_objd; | |
413 | ||
414 | chan_error: | |
1ea11eab MD |
415 | { |
416 | int err; | |
417 | ||
d4419b81 | 418 | err = lttng_ust_objd_unref(chan_objd); |
1ea11eab MD |
419 | assert(!err); |
420 | } | |
f4681817 MD |
421 | objd_error: |
422 | return ret; | |
423 | } | |
424 | ||
425 | /** | |
426 | * lttng_session_cmd - lttng session object command | |
427 | * | |
428 | * @obj: the object | |
429 | * @cmd: the command | |
430 | * @arg: command arg | |
431 | * | |
432 | * This descriptor implements lttng commands: | |
433 | * LTTNG_UST_CHANNEL | |
434 | * Returns a LTTng channel object descriptor | |
435 | * LTTNG_UST_ENABLE | |
436 | * Enables tracing for a session (weak enable) | |
437 | * LTTNG_UST_DISABLE | |
438 | * Disables tracing for a session (strong disable) | |
439 | * LTTNG_UST_METADATA | |
440 | * Returns a LTTng metadata object descriptor | |
441 | * | |
442 | * The returned channel will be deleted when its file descriptor is closed. | |
443 | */ | |
444 | static | |
445 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg) | |
446 | { | |
447 | struct ltt_session *session = objd_private(objd); | |
448 | ||
449 | switch (cmd) { | |
450 | case LTTNG_UST_CHANNEL: | |
451 | return lttng_abi_create_channel(objd, | |
452 | (struct lttng_ust_channel *) arg, | |
453 | PER_CPU_CHANNEL); | |
454 | case LTTNG_UST_SESSION_START: | |
455 | case LTTNG_UST_ENABLE: | |
456 | return ltt_session_enable(session); | |
457 | case LTTNG_UST_SESSION_STOP: | |
458 | case LTTNG_UST_DISABLE: | |
459 | return ltt_session_disable(session); | |
460 | case LTTNG_UST_METADATA: | |
461 | return lttng_abi_create_channel(objd, | |
462 | (struct lttng_ust_channel *) arg, | |
463 | METADATA_CHANNEL); | |
464 | default: | |
465 | return -EINVAL; | |
466 | } | |
467 | } | |
468 | ||
469 | /* | |
470 | * Called when the last file reference is dropped. | |
471 | * | |
472 | * Big fat note: channels and events are invariant for the whole session after | |
473 | * their creation. So this session destruction also destroys all channel and | |
474 | * event structures specific to this session (they are not destroyed when their | |
475 | * individual file is released). | |
476 | */ | |
477 | static | |
1ea11eab | 478 | int lttng_release_session(int objd) |
f4681817 MD |
479 | { |
480 | struct ltt_session *session = objd_private(objd); | |
481 | ||
1ea11eab | 482 | if (session) { |
f4681817 | 483 | ltt_session_destroy(session); |
1ea11eab MD |
484 | return 0; |
485 | } else { | |
486 | return -EINVAL; | |
487 | } | |
f4681817 MD |
488 | } |
489 | ||
b61ce3b2 | 490 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 491 | .release = lttng_release_session, |
f4681817 MD |
492 | .cmd = lttng_session_cmd, |
493 | }; | |
494 | ||
51489cad MD |
495 | /* |
496 | * beware: we don't keep the mutex over the send, but we must walk the | |
497 | * whole list each time we are called again. So sending one tracepoint | |
498 | * at a time means this is O(n^2). TODO: do as in the kernel and send | |
499 | * multiple tracepoints for each call to amortize this cost. | |
500 | */ | |
501 | static | |
502 | void ltt_tracepoint_list_get(struct ltt_tracepoint_list *list, | |
503 | char *tp_list_entry) | |
504 | { | |
505 | if (!list->got_first) { | |
506 | tracepoint_iter_start(&list->iter); | |
507 | list->got_first = 1; | |
508 | goto copy; | |
509 | } | |
510 | tracepoint_iter_next(&list->iter); | |
511 | copy: | |
512 | if (!list->iter.tracepoint) { | |
513 | tp_list_entry[0] = '\0'; /* end of list */ | |
514 | } else { | |
515 | memcpy(tp_list_entry, (*list->iter.tracepoint)->name, | |
516 | LTTNG_UST_SYM_NAME_LEN); | |
517 | } | |
518 | } | |
519 | ||
520 | static | |
521 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg) | |
522 | { | |
523 | struct ltt_tracepoint_list *list = objd_private(objd); | |
b115631f | 524 | char *str = (char *) arg; |
51489cad MD |
525 | |
526 | switch (cmd) { | |
527 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
b115631f MD |
528 | ltt_tracepoint_list_get(list, str); |
529 | if (str[0] == '\0') | |
530 | return -ENOENT; | |
51489cad MD |
531 | return 0; |
532 | default: | |
533 | return -EINVAL; | |
534 | } | |
535 | } | |
536 | ||
537 | static | |
538 | int lttng_abi_tracepoint_list(void) | |
539 | { | |
540 | int list_objd, ret; | |
541 | struct ltt_tracepoint_list *list; | |
542 | ||
543 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops); | |
544 | if (list_objd < 0) { | |
545 | ret = list_objd; | |
546 | goto objd_error; | |
547 | } | |
548 | list = zmalloc(sizeof(*list)); | |
549 | if (!list) { | |
550 | ret = -ENOMEM; | |
551 | goto alloc_error; | |
552 | } | |
553 | objd_set_private(list_objd, list); | |
554 | ||
555 | return list_objd; | |
556 | ||
557 | alloc_error: | |
558 | { | |
559 | int err; | |
560 | ||
561 | err = lttng_ust_objd_unref(list_objd); | |
562 | assert(!err); | |
563 | } | |
564 | objd_error: | |
565 | return ret; | |
566 | } | |
567 | ||
568 | static | |
569 | int lttng_release_tracepoint_list(int objd) | |
570 | { | |
571 | struct ltt_tracepoint_list *list = objd_private(objd); | |
572 | ||
573 | if (list) { | |
574 | tracepoint_iter_stop(&list->iter); | |
575 | free(list); | |
576 | return 0; | |
577 | } else { | |
578 | return -EINVAL; | |
579 | } | |
580 | } | |
581 | ||
582 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
583 | .release = lttng_release_tracepoint_list, | |
584 | .cmd = lttng_tracepoint_list_cmd, | |
585 | }; | |
586 | ||
381c0f1e | 587 | struct stream_priv_data { |
4cfec15c | 588 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e MD |
589 | struct ltt_channel *ltt_chan; |
590 | }; | |
591 | ||
f4681817 | 592 | static |
381c0f1e | 593 | int lttng_abi_open_stream(int channel_objd, struct lttng_ust_stream *info) |
f4681817 MD |
594 | { |
595 | struct ltt_channel *channel = objd_private(channel_objd); | |
4cfec15c | 596 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e | 597 | struct stream_priv_data *priv; |
f4681817 MD |
598 | int stream_objd, ret; |
599 | ||
381c0f1e MD |
600 | buf = channel->ops->buffer_read_open(channel->chan, channel->handle, |
601 | &info->shm_fd, &info->wait_fd, &info->memory_map_size); | |
f4681817 MD |
602 | if (!buf) |
603 | return -ENOENT; | |
604 | ||
381c0f1e MD |
605 | priv = zmalloc(sizeof(*priv)); |
606 | if (!priv) { | |
607 | ret = -ENOMEM; | |
608 | goto alloc_error; | |
609 | } | |
610 | priv->buf = buf; | |
611 | priv->ltt_chan = channel; | |
612 | stream_objd = objd_alloc(priv, &lib_ring_buffer_objd_ops); | |
f4681817 MD |
613 | if (stream_objd < 0) { |
614 | ret = stream_objd; | |
615 | goto objd_error; | |
616 | } | |
381c0f1e MD |
617 | /* Hold a reference on the channel object descriptor */ |
618 | objd_ref(channel_objd); | |
f4681817 MD |
619 | return stream_objd; |
620 | ||
621 | objd_error: | |
381c0f1e MD |
622 | free(priv); |
623 | alloc_error: | |
624 | channel->ops->buffer_read_close(buf, channel->handle); | |
f4681817 MD |
625 | return ret; |
626 | } | |
f4681817 MD |
627 | |
628 | static | |
629 | int lttng_abi_create_event(int channel_objd, | |
630 | struct lttng_ust_event *event_param) | |
631 | { | |
632 | struct ltt_channel *channel = objd_private(channel_objd); | |
633 | struct ltt_event *event; | |
634 | int event_objd, ret; | |
635 | ||
636 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
637 | event_objd = objd_alloc(NULL, <tng_event_ops); | |
638 | if (event_objd < 0) { | |
639 | ret = event_objd; | |
640 | goto objd_error; | |
641 | } | |
642 | /* | |
643 | * We tolerate no failure path after event creation. It will stay | |
644 | * invariant for the rest of the session. | |
645 | */ | |
646 | event = ltt_event_create(channel, event_param, NULL); | |
647 | if (!event) { | |
648 | ret = -EINVAL; | |
649 | goto event_error; | |
650 | } | |
651 | objd_set_private(event_objd, event); | |
652 | /* The event holds a reference on the channel */ | |
653 | objd_ref(channel_objd); | |
654 | return event_objd; | |
655 | ||
656 | event_error: | |
1ea11eab MD |
657 | { |
658 | int err; | |
659 | ||
d4419b81 | 660 | err = lttng_ust_objd_unref(event_objd); |
1ea11eab MD |
661 | assert(!err); |
662 | } | |
f4681817 MD |
663 | objd_error: |
664 | return ret; | |
665 | } | |
666 | ||
667 | /** | |
668 | * lttng_channel_cmd - lttng control through object descriptors | |
669 | * | |
670 | * @objd: the object descriptor | |
671 | * @cmd: the command | |
672 | * @arg: command arg | |
673 | * | |
674 | * This object descriptor implements lttng commands: | |
675 | * LTTNG_UST_STREAM | |
676 | * Returns an event stream object descriptor or failure. | |
677 | * (typically, one event stream records events from one CPU) | |
678 | * LTTNG_UST_EVENT | |
679 | * Returns an event object descriptor or failure. | |
680 | * LTTNG_UST_CONTEXT | |
681 | * Prepend a context field to each event in the channel | |
682 | * LTTNG_UST_ENABLE | |
683 | * Enable recording for events in this channel (weak enable) | |
684 | * LTTNG_UST_DISABLE | |
685 | * Disable recording for events in this channel (strong disable) | |
686 | * | |
687 | * Channel and event file descriptors also hold a reference on the session. | |
688 | */ | |
689 | static | |
690 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg) | |
691 | { | |
692 | struct ltt_channel *channel = objd_private(objd); | |
693 | ||
694 | switch (cmd) { | |
695 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
696 | { |
697 | struct lttng_ust_stream *stream; | |
698 | ||
699 | stream = (struct lttng_ust_stream *) arg; | |
700 | /* stream used as output */ | |
701 | return lttng_abi_open_stream(objd, stream); | |
702 | } | |
f4681817 MD |
703 | case LTTNG_UST_EVENT: |
704 | return lttng_abi_create_event(objd, (struct lttng_ust_event *) arg); | |
705 | case LTTNG_UST_CONTEXT: | |
706 | return lttng_abi_add_context(objd, | |
707 | (struct lttng_ust_context *) arg, | |
708 | &channel->ctx, channel->session); | |
709 | case LTTNG_UST_ENABLE: | |
710 | return ltt_channel_enable(channel); | |
711 | case LTTNG_UST_DISABLE: | |
712 | return ltt_channel_disable(channel); | |
43d330a4 MD |
713 | case LTTNG_UST_FLUSH_BUFFER: |
714 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
715 | default: |
716 | return -EINVAL; | |
717 | } | |
718 | } | |
719 | ||
720 | /** | |
721 | * lttng_metadata_cmd - lttng control through object descriptors | |
722 | * | |
723 | * @objd: the object descriptor | |
724 | * @cmd: the command | |
725 | * @arg: command arg | |
726 | * | |
727 | * This object descriptor implements lttng commands: | |
728 | * LTTNG_UST_STREAM | |
729 | * Returns an event stream file descriptor or failure. | |
730 | * | |
731 | * Channel and event file descriptors also hold a reference on the session. | |
732 | */ | |
733 | static | |
734 | long lttng_metadata_cmd(int objd, unsigned int cmd, unsigned long arg) | |
735 | { | |
43861eab MD |
736 | struct ltt_channel *channel = objd_private(objd); |
737 | ||
f4681817 MD |
738 | switch (cmd) { |
739 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
740 | { |
741 | struct lttng_ust_stream *stream; | |
742 | ||
743 | stream = (struct lttng_ust_stream *) arg; | |
744 | /* stream used as output */ | |
745 | return lttng_abi_open_stream(objd, stream); | |
746 | } | |
43d330a4 MD |
747 | case LTTNG_UST_FLUSH_BUFFER: |
748 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
749 | default: |
750 | return -EINVAL; | |
751 | } | |
752 | } | |
753 | ||
754 | #if 0 | |
755 | /** | |
756 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
757 | * | |
758 | * @file: the file | |
759 | * @wait: poll table | |
760 | */ | |
761 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) | |
762 | { | |
763 | struct ltt_channel *channel = file->private_data; | |
764 | unsigned int mask = 0; | |
765 | ||
766 | if (file->f_mode & FMODE_READ) { | |
767 | poll_wait_set_exclusive(wait); | |
768 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), | |
769 | wait); | |
770 | ||
771 | if (channel->ops->is_disabled(channel->chan)) | |
772 | return POLLERR; | |
773 | if (channel->ops->is_finalized(channel->chan)) | |
774 | return POLLHUP; | |
775 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) | |
776 | return POLLIN | POLLRDNORM; | |
777 | return 0; | |
778 | } | |
779 | return mask; | |
780 | ||
781 | } | |
782 | #endif //0 | |
783 | ||
784 | static | |
785 | int lttng_channel_release(int objd) | |
786 | { | |
787 | struct ltt_channel *channel = objd_private(objd); | |
788 | ||
789 | if (channel) | |
d4419b81 | 790 | return lttng_ust_objd_unref(channel->session->objd); |
f4681817 MD |
791 | return 0; |
792 | } | |
793 | ||
b61ce3b2 | 794 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 MD |
795 | .release = lttng_channel_release, |
796 | //.poll = lttng_channel_poll, | |
797 | .cmd = lttng_channel_cmd, | |
798 | }; | |
799 | ||
b61ce3b2 | 800 | static const struct lttng_ust_objd_ops lttng_metadata_ops = { |
f4681817 MD |
801 | .release = lttng_channel_release, |
802 | .cmd = lttng_metadata_cmd, | |
803 | }; | |
804 | ||
381c0f1e MD |
805 | /** |
806 | * lttng_rb_cmd - lttng ring buffer control through object descriptors | |
807 | * | |
808 | * @objd: the object descriptor | |
809 | * @cmd: the command | |
810 | * @arg: command arg | |
811 | * | |
812 | * This object descriptor implements lttng commands: | |
813 | * (None for now. Access is done directly though shm.) | |
381c0f1e MD |
814 | */ |
815 | static | |
816 | long lttng_rb_cmd(int objd, unsigned int cmd, unsigned long arg) | |
817 | { | |
381c0f1e MD |
818 | switch (cmd) { |
819 | default: | |
820 | return -EINVAL; | |
821 | } | |
822 | } | |
823 | ||
824 | static | |
825 | int lttng_rb_release(int objd) | |
826 | { | |
827 | struct stream_priv_data *priv = objd_private(objd); | |
4cfec15c | 828 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e MD |
829 | struct ltt_channel *channel; |
830 | ||
831 | if (priv) { | |
832 | buf = priv->buf; | |
833 | channel = priv->ltt_chan; | |
834 | free(priv); | |
824f40b8 | 835 | channel->ops->buffer_read_close(buf, channel->handle); |
381c0f1e | 836 | |
d4419b81 | 837 | return lttng_ust_objd_unref(channel->objd); |
381c0f1e MD |
838 | } |
839 | return 0; | |
840 | } | |
841 | ||
b61ce3b2 | 842 | static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops = { |
381c0f1e MD |
843 | .release = lttng_rb_release, |
844 | .cmd = lttng_rb_cmd, | |
845 | }; | |
846 | ||
f4681817 MD |
847 | /** |
848 | * lttng_event_cmd - lttng control through object descriptors | |
849 | * | |
850 | * @objd: the object descriptor | |
851 | * @cmd: the command | |
852 | * @arg: command arg | |
853 | * | |
854 | * This object descriptor implements lttng commands: | |
855 | * LTTNG_UST_CONTEXT | |
856 | * Prepend a context field to each record of this event | |
857 | * LTTNG_UST_ENABLE | |
858 | * Enable recording for this event (weak enable) | |
859 | * LTTNG_UST_DISABLE | |
860 | * Disable recording for this event (strong disable) | |
861 | */ | |
862 | static | |
863 | long lttng_event_cmd(int objd, unsigned int cmd, unsigned long arg) | |
864 | { | |
865 | struct ltt_event *event = objd_private(objd); | |
866 | ||
867 | switch (cmd) { | |
868 | case LTTNG_UST_CONTEXT: | |
869 | return lttng_abi_add_context(objd, | |
870 | (struct lttng_ust_context *) arg, | |
871 | &event->ctx, event->chan->session); | |
872 | case LTTNG_UST_ENABLE: | |
873 | return ltt_event_enable(event); | |
874 | case LTTNG_UST_DISABLE: | |
875 | return ltt_event_disable(event); | |
876 | default: | |
877 | return -EINVAL; | |
878 | } | |
879 | } | |
880 | ||
881 | static | |
882 | int lttng_event_release(int objd) | |
883 | { | |
884 | struct ltt_event *event = objd_private(objd); | |
885 | ||
886 | if (event) | |
d4419b81 | 887 | return lttng_ust_objd_unref(event->chan->objd); |
f4681817 MD |
888 | return 0; |
889 | } | |
890 | ||
891 | /* TODO: filter control ioctl */ | |
b61ce3b2 | 892 | static const struct lttng_ust_objd_ops lttng_event_ops = { |
f4681817 MD |
893 | .release = lttng_event_release, |
894 | .cmd = lttng_event_cmd, | |
895 | }; | |
896 | ||
b35d179d | 897 | void lttng_ust_abi_exit(void) |
f4681817 | 898 | { |
f4681817 MD |
899 | objd_table_destroy(); |
900 | } |