Commit | Line | Data |
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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 | 30 | #include <lttng/ust-events.h> |
23c8854a | 31 | #include <lttng/ust-version.h> |
44c72f10 MD |
32 | #include <usterr-signal-safe.h> |
33 | #include <helper.h> | |
f4681817 | 34 | #include "ltt-tracer.h" |
4ab44fbe MD |
35 | #include "tracepoint-internal.h" |
36 | ||
45e9e699 MD |
37 | static int lttng_ust_abi_close_in_progress; |
38 | ||
51489cad MD |
39 | static |
40 | int lttng_abi_tracepoint_list(void); | |
41 | ||
f4681817 MD |
42 | /* |
43 | * Object descriptor table. Should be protected from concurrent access | |
44 | * by the caller. | |
45 | */ | |
46 | ||
b61ce3b2 | 47 | struct lttng_ust_obj { |
f4681817 MD |
48 | union { |
49 | struct { | |
50 | void *private_data; | |
b61ce3b2 | 51 | const struct lttng_ust_objd_ops *ops; |
f4681817 MD |
52 | int f_count; |
53 | } s; | |
54 | int freelist_next; /* offset freelist. end is -1. */ | |
55 | } u; | |
56 | }; | |
57 | ||
b61ce3b2 MD |
58 | struct lttng_ust_objd_table { |
59 | struct lttng_ust_obj *array; | |
f4681817 MD |
60 | unsigned int len, allocated_len; |
61 | int freelist_head; /* offset freelist head. end is -1 */ | |
62 | }; | |
63 | ||
b61ce3b2 | 64 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
65 | .freelist_head = -1, |
66 | }; | |
67 | ||
68 | static | |
b61ce3b2 | 69 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops) |
f4681817 | 70 | { |
b61ce3b2 | 71 | struct lttng_ust_obj *obj; |
f4681817 MD |
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; | |
b61ce3b2 | 81 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
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; | |
b61ce3b2 | 89 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
90 | if (!new_table) |
91 | return -ENOMEM; | |
92 | memcpy(new_table, old_table, | |
b61ce3b2 | 93 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
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 | |
b61ce3b2 | 109 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
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 | { | |
b61ce3b2 | 121 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
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 | { | |
b61ce3b2 | 129 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
130 | assert(obj); |
131 | obj->u.s.private_data = private_data; | |
132 | } | |
133 | ||
b61ce3b2 | 134 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 135 | { |
b61ce3b2 | 136 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 137 | |
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 | { | |
b61ce3b2 | 146 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
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 | { | |
b61ce3b2 | 158 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
159 | obj->u.s.f_count++; |
160 | } | |
161 | ||
d4419b81 | 162 | int lttng_ust_objd_unref(int id) |
f4681817 | 163 | { |
b61ce3b2 | 164 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 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) { | |
b61ce3b2 | 173 | const struct lttng_ust_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 | ||
fb50c39d | 187 | for (i = 0; i < objd_table.allocated_len; i++) |
d4419b81 | 188 | (void) lttng_ust_objd_unref(i); |
f4681817 | 189 | free(objd_table.array); |
02fb3381 MD |
190 | objd_table.array = NULL; |
191 | objd_table.len = 0; | |
192 | objd_table.allocated_len = 0; | |
17dfb34b | 193 | objd_table.freelist_head = -1; |
f4681817 MD |
194 | } |
195 | ||
196 | /* | |
197 | * This is LTTng's own personal way to create an ABI for sessiond. | |
198 | * We send commands over a socket. | |
199 | */ | |
200 | ||
b61ce3b2 MD |
201 | static const struct lttng_ust_objd_ops lttng_ops; |
202 | static const struct lttng_ust_objd_ops lttng_session_ops; | |
203 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
204 | static const struct lttng_ust_objd_ops lttng_metadata_ops; | |
205 | static const struct lttng_ust_objd_ops lttng_event_ops; | |
1f18504e | 206 | static const struct lttng_ust_objd_ops lttng_loglevel_ops; |
b61ce3b2 | 207 | static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops; |
51489cad | 208 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
f4681817 MD |
209 | |
210 | enum channel_type { | |
211 | PER_CPU_CHANNEL, | |
212 | METADATA_CHANNEL, | |
213 | }; | |
214 | ||
46050b1a MD |
215 | int lttng_abi_create_root_handle(void) |
216 | { | |
217 | int root_handle; | |
218 | ||
219 | root_handle = objd_alloc(NULL, <tng_ops); | |
46050b1a MD |
220 | return root_handle; |
221 | } | |
222 | ||
818173b9 | 223 | static |
f4681817 MD |
224 | int lttng_abi_create_session(void) |
225 | { | |
226 | struct ltt_session *session; | |
227 | int session_objd, ret; | |
228 | ||
229 | session = ltt_session_create(); | |
230 | if (!session) | |
231 | return -ENOMEM; | |
232 | session_objd = objd_alloc(session, <tng_session_ops); | |
233 | if (session_objd < 0) { | |
234 | ret = session_objd; | |
235 | goto objd_error; | |
236 | } | |
237 | session->objd = session_objd; | |
238 | return session_objd; | |
239 | ||
240 | objd_error: | |
241 | ltt_session_destroy(session); | |
242 | return ret; | |
243 | } | |
244 | ||
f4681817 MD |
245 | static |
246 | long lttng_abi_tracer_version(int objd, | |
247 | struct lttng_ust_tracer_version *v) | |
248 | { | |
23c8854a MD |
249 | v->major = LTTNG_UST_MAJOR_VERSION; |
250 | v->minor = LTTNG_UST_MINOR_VERSION; | |
251 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
252 | return 0; |
253 | } | |
254 | ||
255 | static | |
256 | long lttng_abi_add_context(int objd, | |
257 | struct lttng_ust_context *context_param, | |
258 | struct lttng_ctx **ctx, struct ltt_session *session) | |
259 | { | |
260 | if (session->been_active) | |
261 | return -EPERM; | |
262 | ||
263 | switch (context_param->ctx) { | |
8de38cf7 MD |
264 | case LTTNG_UST_CONTEXT_PTHREAD_ID: |
265 | return lttng_add_pthread_id_to_ctx(ctx); | |
3b402b40 MD |
266 | case LTTNG_UST_CONTEXT_VTID: |
267 | return lttng_add_vtid_to_ctx(ctx); | |
c1ef86f0 MD |
268 | case LTTNG_UST_CONTEXT_VPID: |
269 | return lttng_add_vpid_to_ctx(ctx); | |
4847e9bb MD |
270 | case LTTNG_UST_CONTEXT_PROCNAME: |
271 | return lttng_add_procname_to_ctx(ctx); | |
f4681817 MD |
272 | default: |
273 | return -EINVAL; | |
274 | } | |
275 | } | |
276 | ||
277 | /** | |
278 | * lttng_cmd - lttng control through socket commands | |
279 | * | |
280 | * @objd: the object descriptor | |
281 | * @cmd: the command | |
282 | * @arg: command arg | |
283 | * | |
284 | * This descriptor implements lttng commands: | |
285 | * LTTNG_UST_SESSION | |
286 | * Returns a LTTng trace session object descriptor | |
287 | * LTTNG_UST_TRACER_VERSION | |
288 | * Returns the LTTng kernel tracer version | |
289 | * LTTNG_UST_TRACEPOINT_LIST | |
290 | * Returns a file descriptor listing available tracepoints | |
291 | * LTTNG_UST_WAIT_QUIESCENT | |
292 | * Returns after all previously running probes have completed | |
293 | * | |
294 | * The returned session will be deleted when its file descriptor is closed. | |
295 | */ | |
296 | static | |
297 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg) | |
298 | { | |
299 | switch (cmd) { | |
300 | case LTTNG_UST_SESSION: | |
301 | return lttng_abi_create_session(); | |
302 | case LTTNG_UST_TRACER_VERSION: | |
303 | return lttng_abi_tracer_version(objd, | |
304 | (struct lttng_ust_tracer_version *) arg); | |
305 | case LTTNG_UST_TRACEPOINT_LIST: | |
51489cad | 306 | return lttng_abi_tracepoint_list(); |
f4681817 MD |
307 | case LTTNG_UST_WAIT_QUIESCENT: |
308 | synchronize_trace(); | |
309 | return 0; | |
310 | default: | |
311 | return -EINVAL; | |
312 | } | |
313 | } | |
314 | ||
b61ce3b2 | 315 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
316 | .cmd = lttng_cmd, |
317 | }; | |
318 | ||
319 | /* | |
320 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
321 | * error, but cannot return any error, because the channel information is | |
322 | * invariant. | |
323 | */ | |
324 | static | |
325 | void lttng_metadata_create_events(int channel_objd) | |
326 | { | |
327 | struct ltt_channel *channel = objd_private(channel_objd); | |
328 | static struct lttng_ust_event metadata_params = { | |
329 | .instrumentation = LTTNG_UST_TRACEPOINT, | |
a4ada9b8 | 330 | .name = "lttng_ust:metadata", |
f4681817 MD |
331 | }; |
332 | struct ltt_event *event; | |
576599a0 | 333 | int ret; |
f4681817 MD |
334 | |
335 | /* | |
336 | * We tolerate no failure path after event creation. It will stay | |
337 | * invariant for the rest of the session. | |
338 | */ | |
576599a0 MD |
339 | ret = ltt_event_create(channel, &metadata_params, NULL, &event); |
340 | if (ret < 0) { | |
f4681817 MD |
341 | goto create_error; |
342 | } | |
343 | return; | |
344 | ||
345 | create_error: | |
346 | WARN_ON(1); | |
347 | return; /* not allowed to return error */ | |
348 | } | |
349 | ||
f4681817 MD |
350 | int lttng_abi_create_channel(int session_objd, |
351 | struct lttng_ust_channel *chan_param, | |
352 | enum channel_type channel_type) | |
353 | { | |
354 | struct ltt_session *session = objd_private(session_objd); | |
b61ce3b2 | 355 | const struct lttng_ust_objd_ops *ops; |
f4681817 MD |
356 | const char *transport_name; |
357 | struct ltt_channel *chan; | |
358 | int chan_objd; | |
359 | int ret = 0; | |
d028eddb | 360 | struct ltt_channel chan_priv_init; |
f4681817 | 361 | |
f4681817 MD |
362 | switch (channel_type) { |
363 | case PER_CPU_CHANNEL: | |
364 | if (chan_param->output == LTTNG_UST_MMAP) { | |
365 | transport_name = chan_param->overwrite ? | |
366 | "relay-overwrite-mmap" : "relay-discard-mmap"; | |
367 | } else { | |
368 | return -EINVAL; | |
369 | } | |
370 | ops = <tng_channel_ops; | |
371 | break; | |
372 | case METADATA_CHANNEL: | |
373 | if (chan_param->output == LTTNG_UST_MMAP) | |
374 | transport_name = "relay-metadata-mmap"; | |
375 | else | |
376 | return -EINVAL; | |
377 | ops = <tng_metadata_ops; | |
378 | break; | |
379 | default: | |
380 | transport_name = "<unknown>"; | |
fe38d4af MD |
381 | return -EINVAL; |
382 | } | |
383 | chan_objd = objd_alloc(NULL, ops); | |
384 | if (chan_objd < 0) { | |
385 | ret = chan_objd; | |
386 | goto objd_error; | |
f4681817 | 387 | } |
d028eddb MD |
388 | memset(&chan_priv_init, 0, sizeof(chan_priv_init)); |
389 | /* Copy of session UUID for consumer (availability through shm) */ | |
390 | memcpy(chan_priv_init.uuid, session->uuid, sizeof(session->uuid)); | |
391 | ||
f4681817 MD |
392 | /* |
393 | * We tolerate no failure path after channel creation. It will stay | |
394 | * invariant for the rest of the session. | |
395 | */ | |
396 | chan = ltt_channel_create(session, transport_name, NULL, | |
397 | chan_param->subbuf_size, | |
398 | chan_param->num_subbuf, | |
399 | chan_param->switch_timer_interval, | |
193183fb MD |
400 | chan_param->read_timer_interval, |
401 | &chan_param->shm_fd, | |
402 | &chan_param->wait_fd, | |
d028eddb MD |
403 | &chan_param->memory_map_size, |
404 | &chan_priv_init); | |
f4681817 MD |
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 | } | |
f4681817 MD |
415 | /* The channel created holds a reference on the session */ |
416 | objd_ref(session_objd); | |
417 | ||
418 | return chan_objd; | |
419 | ||
420 | chan_error: | |
1ea11eab MD |
421 | { |
422 | int err; | |
423 | ||
d4419b81 | 424 | err = lttng_ust_objd_unref(chan_objd); |
1ea11eab MD |
425 | assert(!err); |
426 | } | |
f4681817 MD |
427 | objd_error: |
428 | return ret; | |
429 | } | |
430 | ||
431 | /** | |
432 | * lttng_session_cmd - lttng session object command | |
433 | * | |
434 | * @obj: the object | |
435 | * @cmd: the command | |
436 | * @arg: command arg | |
437 | * | |
438 | * This descriptor implements lttng commands: | |
439 | * LTTNG_UST_CHANNEL | |
440 | * Returns a LTTng channel object descriptor | |
441 | * LTTNG_UST_ENABLE | |
442 | * Enables tracing for a session (weak enable) | |
443 | * LTTNG_UST_DISABLE | |
444 | * Disables tracing for a session (strong disable) | |
445 | * LTTNG_UST_METADATA | |
446 | * Returns a LTTng metadata object descriptor | |
447 | * | |
448 | * The returned channel will be deleted when its file descriptor is closed. | |
449 | */ | |
450 | static | |
451 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg) | |
452 | { | |
453 | struct ltt_session *session = objd_private(objd); | |
454 | ||
455 | switch (cmd) { | |
456 | case LTTNG_UST_CHANNEL: | |
457 | return lttng_abi_create_channel(objd, | |
458 | (struct lttng_ust_channel *) arg, | |
459 | PER_CPU_CHANNEL); | |
460 | case LTTNG_UST_SESSION_START: | |
461 | case LTTNG_UST_ENABLE: | |
462 | return ltt_session_enable(session); | |
463 | case LTTNG_UST_SESSION_STOP: | |
464 | case LTTNG_UST_DISABLE: | |
465 | return ltt_session_disable(session); | |
466 | case LTTNG_UST_METADATA: | |
467 | return lttng_abi_create_channel(objd, | |
468 | (struct lttng_ust_channel *) arg, | |
469 | METADATA_CHANNEL); | |
470 | default: | |
471 | return -EINVAL; | |
472 | } | |
473 | } | |
474 | ||
475 | /* | |
476 | * Called when the last file reference is dropped. | |
477 | * | |
478 | * Big fat note: channels and events are invariant for the whole session after | |
479 | * their creation. So this session destruction also destroys all channel and | |
480 | * event structures specific to this session (they are not destroyed when their | |
481 | * individual file is released). | |
482 | */ | |
483 | static | |
1ea11eab | 484 | int lttng_release_session(int objd) |
f4681817 MD |
485 | { |
486 | struct ltt_session *session = objd_private(objd); | |
487 | ||
1ea11eab | 488 | if (session) { |
f4681817 | 489 | ltt_session_destroy(session); |
1ea11eab MD |
490 | return 0; |
491 | } else { | |
492 | return -EINVAL; | |
493 | } | |
f4681817 MD |
494 | } |
495 | ||
b61ce3b2 | 496 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 497 | .release = lttng_release_session, |
f4681817 MD |
498 | .cmd = lttng_session_cmd, |
499 | }; | |
500 | ||
51489cad MD |
501 | static |
502 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg) | |
503 | { | |
c8fcf224 | 504 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
cbef6901 MD |
505 | struct lttng_ust_tracepoint_iter *tp = |
506 | (struct lttng_ust_tracepoint_iter *) arg; | |
c8fcf224 | 507 | struct lttng_ust_tracepoint_iter *iter; |
51489cad MD |
508 | |
509 | switch (cmd) { | |
510 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
c8fcf224 MD |
511 | { |
512 | retry: | |
513 | iter = lttng_ust_tracepoint_list_get_iter_next(list); | |
514 | if (!iter) | |
b115631f | 515 | return -ENOENT; |
c8fcf224 MD |
516 | if (!strcmp(iter->name, "lttng_ust:metadata")) |
517 | goto retry; | |
518 | memcpy(tp, iter, sizeof(*tp)); | |
51489cad | 519 | return 0; |
c8fcf224 | 520 | } |
51489cad MD |
521 | default: |
522 | return -EINVAL; | |
523 | } | |
524 | } | |
525 | ||
526 | static | |
527 | int lttng_abi_tracepoint_list(void) | |
528 | { | |
529 | int list_objd, ret; | |
c8fcf224 | 530 | struct lttng_ust_tracepoint_list *list; |
51489cad MD |
531 | |
532 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops); | |
533 | if (list_objd < 0) { | |
534 | ret = list_objd; | |
535 | goto objd_error; | |
536 | } | |
537 | list = zmalloc(sizeof(*list)); | |
538 | if (!list) { | |
539 | ret = -ENOMEM; | |
540 | goto alloc_error; | |
541 | } | |
542 | objd_set_private(list_objd, list); | |
543 | ||
c8fcf224 MD |
544 | /* populate list by walking on all registered probes. */ |
545 | ret = ltt_probes_get_event_list(list); | |
546 | if (ret) { | |
547 | goto list_error; | |
548 | } | |
51489cad MD |
549 | return list_objd; |
550 | ||
c8fcf224 MD |
551 | list_error: |
552 | free(list); | |
51489cad MD |
553 | alloc_error: |
554 | { | |
555 | int err; | |
556 | ||
557 | err = lttng_ust_objd_unref(list_objd); | |
558 | assert(!err); | |
559 | } | |
560 | objd_error: | |
561 | return ret; | |
562 | } | |
563 | ||
564 | static | |
565 | int lttng_release_tracepoint_list(int objd) | |
566 | { | |
c8fcf224 | 567 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
568 | |
569 | if (list) { | |
c8fcf224 | 570 | ltt_probes_prune_event_list(list); |
51489cad MD |
571 | free(list); |
572 | return 0; | |
573 | } else { | |
574 | return -EINVAL; | |
575 | } | |
576 | } | |
577 | ||
578 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
579 | .release = lttng_release_tracepoint_list, | |
580 | .cmd = lttng_tracepoint_list_cmd, | |
581 | }; | |
582 | ||
381c0f1e | 583 | struct stream_priv_data { |
4cfec15c | 584 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e MD |
585 | struct ltt_channel *ltt_chan; |
586 | }; | |
587 | ||
f4681817 | 588 | static |
381c0f1e | 589 | int lttng_abi_open_stream(int channel_objd, struct lttng_ust_stream *info) |
f4681817 MD |
590 | { |
591 | struct ltt_channel *channel = objd_private(channel_objd); | |
4cfec15c | 592 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e | 593 | struct stream_priv_data *priv; |
f4681817 MD |
594 | int stream_objd, ret; |
595 | ||
381c0f1e MD |
596 | buf = channel->ops->buffer_read_open(channel->chan, channel->handle, |
597 | &info->shm_fd, &info->wait_fd, &info->memory_map_size); | |
f4681817 MD |
598 | if (!buf) |
599 | return -ENOENT; | |
600 | ||
381c0f1e MD |
601 | priv = zmalloc(sizeof(*priv)); |
602 | if (!priv) { | |
603 | ret = -ENOMEM; | |
604 | goto alloc_error; | |
605 | } | |
606 | priv->buf = buf; | |
607 | priv->ltt_chan = channel; | |
608 | stream_objd = objd_alloc(priv, &lib_ring_buffer_objd_ops); | |
f4681817 MD |
609 | if (stream_objd < 0) { |
610 | ret = stream_objd; | |
611 | goto objd_error; | |
612 | } | |
381c0f1e MD |
613 | /* Hold a reference on the channel object descriptor */ |
614 | objd_ref(channel_objd); | |
f4681817 MD |
615 | return stream_objd; |
616 | ||
617 | objd_error: | |
381c0f1e MD |
618 | free(priv); |
619 | alloc_error: | |
620 | channel->ops->buffer_read_close(buf, channel->handle); | |
f4681817 MD |
621 | return ret; |
622 | } | |
f4681817 MD |
623 | |
624 | static | |
625 | int lttng_abi_create_event(int channel_objd, | |
626 | struct lttng_ust_event *event_param) | |
627 | { | |
628 | struct ltt_channel *channel = objd_private(channel_objd); | |
629 | struct ltt_event *event; | |
630 | int event_objd, ret; | |
631 | ||
632 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
633 | event_objd = objd_alloc(NULL, <tng_event_ops); | |
634 | if (event_objd < 0) { | |
635 | ret = event_objd; | |
636 | goto objd_error; | |
637 | } | |
638 | /* | |
639 | * We tolerate no failure path after event creation. It will stay | |
640 | * invariant for the rest of the session. | |
641 | */ | |
576599a0 MD |
642 | ret = ltt_event_create(channel, event_param, NULL, &event); |
643 | if (ret < 0) { | |
f4681817 MD |
644 | goto event_error; |
645 | } | |
646 | objd_set_private(event_objd, event); | |
647 | /* The event holds a reference on the channel */ | |
648 | objd_ref(channel_objd); | |
649 | return event_objd; | |
650 | ||
651 | event_error: | |
1ea11eab MD |
652 | { |
653 | int err; | |
654 | ||
d4419b81 | 655 | err = lttng_ust_objd_unref(event_objd); |
1ea11eab MD |
656 | assert(!err); |
657 | } | |
f4681817 MD |
658 | objd_error: |
659 | return ret; | |
660 | } | |
661 | ||
1f18504e MD |
662 | static |
663 | int lttng_abi_create_loglevel(int channel_objd, | |
664 | struct lttng_ust_event *event_param) | |
665 | { | |
666 | struct ltt_channel *channel = objd_private(channel_objd); | |
574a6217 | 667 | struct session_loglevel *loglevel; |
1f18504e MD |
668 | int loglevel_objd, ret; |
669 | ||
670 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
671 | loglevel_objd = objd_alloc(NULL, <tng_loglevel_ops); | |
672 | if (loglevel_objd < 0) { | |
673 | ret = loglevel_objd; | |
674 | goto objd_error; | |
675 | } | |
676 | /* | |
677 | * We tolerate no failure path after loglevel creation. It will | |
678 | * stay invariant for the rest of the session. | |
679 | */ | |
680 | ret = ltt_loglevel_create(channel, event_param, &loglevel); | |
681 | if (ret < 0) { | |
682 | goto loglevel_error; | |
683 | } | |
684 | objd_set_private(loglevel_objd, loglevel); | |
685 | /* The loglevel holds a reference on the channel */ | |
686 | objd_ref(channel_objd); | |
687 | return loglevel_objd; | |
688 | ||
689 | loglevel_error: | |
690 | { | |
691 | int err; | |
692 | ||
693 | err = lttng_ust_objd_unref(loglevel_objd); | |
694 | assert(!err); | |
695 | } | |
696 | objd_error: | |
697 | return ret; | |
698 | } | |
699 | ||
f4681817 MD |
700 | /** |
701 | * lttng_channel_cmd - lttng control through object descriptors | |
702 | * | |
703 | * @objd: the object descriptor | |
704 | * @cmd: the command | |
705 | * @arg: command arg | |
706 | * | |
707 | * This object descriptor implements lttng commands: | |
708 | * LTTNG_UST_STREAM | |
709 | * Returns an event stream object descriptor or failure. | |
710 | * (typically, one event stream records events from one CPU) | |
711 | * LTTNG_UST_EVENT | |
712 | * Returns an event object descriptor or failure. | |
713 | * LTTNG_UST_CONTEXT | |
714 | * Prepend a context field to each event in the channel | |
715 | * LTTNG_UST_ENABLE | |
716 | * Enable recording for events in this channel (weak enable) | |
717 | * LTTNG_UST_DISABLE | |
718 | * Disable recording for events in this channel (strong disable) | |
719 | * | |
720 | * Channel and event file descriptors also hold a reference on the session. | |
721 | */ | |
722 | static | |
723 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg) | |
724 | { | |
725 | struct ltt_channel *channel = objd_private(objd); | |
726 | ||
727 | switch (cmd) { | |
728 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
729 | { |
730 | struct lttng_ust_stream *stream; | |
731 | ||
732 | stream = (struct lttng_ust_stream *) arg; | |
733 | /* stream used as output */ | |
734 | return lttng_abi_open_stream(objd, stream); | |
735 | } | |
f4681817 | 736 | case LTTNG_UST_EVENT: |
1f18504e MD |
737 | { |
738 | struct lttng_ust_event *event_param = | |
739 | (struct lttng_ust_event *) arg; | |
740 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT_LOGLEVEL) { | |
741 | return lttng_abi_create_loglevel(objd, event_param); | |
742 | } else { | |
743 | return lttng_abi_create_event(objd, event_param); | |
744 | } | |
745 | } | |
f4681817 MD |
746 | case LTTNG_UST_CONTEXT: |
747 | return lttng_abi_add_context(objd, | |
748 | (struct lttng_ust_context *) arg, | |
749 | &channel->ctx, channel->session); | |
750 | case LTTNG_UST_ENABLE: | |
751 | return ltt_channel_enable(channel); | |
752 | case LTTNG_UST_DISABLE: | |
753 | return ltt_channel_disable(channel); | |
43d330a4 MD |
754 | case LTTNG_UST_FLUSH_BUFFER: |
755 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
756 | default: |
757 | return -EINVAL; | |
758 | } | |
759 | } | |
760 | ||
761 | /** | |
762 | * lttng_metadata_cmd - lttng control through object descriptors | |
763 | * | |
764 | * @objd: the object descriptor | |
765 | * @cmd: the command | |
766 | * @arg: command arg | |
767 | * | |
768 | * This object descriptor implements lttng commands: | |
769 | * LTTNG_UST_STREAM | |
770 | * Returns an event stream file descriptor or failure. | |
771 | * | |
772 | * Channel and event file descriptors also hold a reference on the session. | |
773 | */ | |
774 | static | |
775 | long lttng_metadata_cmd(int objd, unsigned int cmd, unsigned long arg) | |
776 | { | |
43861eab MD |
777 | struct ltt_channel *channel = objd_private(objd); |
778 | ||
f4681817 MD |
779 | switch (cmd) { |
780 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
781 | { |
782 | struct lttng_ust_stream *stream; | |
783 | ||
784 | stream = (struct lttng_ust_stream *) arg; | |
785 | /* stream used as output */ | |
786 | return lttng_abi_open_stream(objd, stream); | |
787 | } | |
43d330a4 MD |
788 | case LTTNG_UST_FLUSH_BUFFER: |
789 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
790 | default: |
791 | return -EINVAL; | |
792 | } | |
793 | } | |
794 | ||
795 | #if 0 | |
796 | /** | |
797 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
798 | * | |
799 | * @file: the file | |
800 | * @wait: poll table | |
801 | */ | |
802 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) | |
803 | { | |
804 | struct ltt_channel *channel = file->private_data; | |
805 | unsigned int mask = 0; | |
806 | ||
807 | if (file->f_mode & FMODE_READ) { | |
808 | poll_wait_set_exclusive(wait); | |
809 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), | |
810 | wait); | |
811 | ||
812 | if (channel->ops->is_disabled(channel->chan)) | |
813 | return POLLERR; | |
814 | if (channel->ops->is_finalized(channel->chan)) | |
815 | return POLLHUP; | |
816 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) | |
817 | return POLLIN | POLLRDNORM; | |
818 | return 0; | |
819 | } | |
820 | return mask; | |
821 | ||
822 | } | |
823 | #endif //0 | |
824 | ||
825 | static | |
826 | int lttng_channel_release(int objd) | |
827 | { | |
828 | struct ltt_channel *channel = objd_private(objd); | |
829 | ||
830 | if (channel) | |
d4419b81 | 831 | return lttng_ust_objd_unref(channel->session->objd); |
f4681817 MD |
832 | return 0; |
833 | } | |
834 | ||
b61ce3b2 | 835 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 MD |
836 | .release = lttng_channel_release, |
837 | //.poll = lttng_channel_poll, | |
838 | .cmd = lttng_channel_cmd, | |
839 | }; | |
840 | ||
b61ce3b2 | 841 | static const struct lttng_ust_objd_ops lttng_metadata_ops = { |
f4681817 MD |
842 | .release = lttng_channel_release, |
843 | .cmd = lttng_metadata_cmd, | |
844 | }; | |
845 | ||
381c0f1e MD |
846 | /** |
847 | * lttng_rb_cmd - lttng ring buffer control through object descriptors | |
848 | * | |
849 | * @objd: the object descriptor | |
850 | * @cmd: the command | |
851 | * @arg: command arg | |
852 | * | |
853 | * This object descriptor implements lttng commands: | |
854 | * (None for now. Access is done directly though shm.) | |
381c0f1e MD |
855 | */ |
856 | static | |
857 | long lttng_rb_cmd(int objd, unsigned int cmd, unsigned long arg) | |
858 | { | |
381c0f1e MD |
859 | switch (cmd) { |
860 | default: | |
861 | return -EINVAL; | |
862 | } | |
863 | } | |
864 | ||
865 | static | |
866 | int lttng_rb_release(int objd) | |
867 | { | |
868 | struct stream_priv_data *priv = objd_private(objd); | |
4cfec15c | 869 | struct lttng_ust_lib_ring_buffer *buf; |
381c0f1e MD |
870 | struct ltt_channel *channel; |
871 | ||
872 | if (priv) { | |
873 | buf = priv->buf; | |
874 | channel = priv->ltt_chan; | |
875 | free(priv); | |
45e9e699 MD |
876 | /* |
877 | * If we are at ABI exit, we don't want to close the | |
878 | * buffer opened for read: it is being shared between | |
879 | * the parent and child (right after fork), and we don't | |
880 | * want the child to close it for the parent. For a real | |
881 | * exit, we don't care about marking it as closed, as | |
882 | * the consumer daemon (if there is one) will do fine | |
883 | * even if we don't mark it as "closed" for reading on | |
884 | * our side. | |
885 | * We only mark it as closed if it is being explicitely | |
886 | * released by the session daemon with an explicit | |
887 | * release command. | |
888 | */ | |
889 | if (!lttng_ust_abi_close_in_progress) | |
890 | channel->ops->buffer_read_close(buf, channel->handle); | |
381c0f1e | 891 | |
d4419b81 | 892 | return lttng_ust_objd_unref(channel->objd); |
381c0f1e MD |
893 | } |
894 | return 0; | |
895 | } | |
896 | ||
b61ce3b2 | 897 | static const struct lttng_ust_objd_ops lib_ring_buffer_objd_ops = { |
381c0f1e MD |
898 | .release = lttng_rb_release, |
899 | .cmd = lttng_rb_cmd, | |
900 | }; | |
901 | ||
f4681817 MD |
902 | /** |
903 | * lttng_event_cmd - lttng control through object descriptors | |
904 | * | |
905 | * @objd: the object descriptor | |
906 | * @cmd: the command | |
907 | * @arg: command arg | |
908 | * | |
909 | * This object descriptor implements lttng commands: | |
910 | * LTTNG_UST_CONTEXT | |
911 | * Prepend a context field to each record of this event | |
912 | * LTTNG_UST_ENABLE | |
913 | * Enable recording for this event (weak enable) | |
914 | * LTTNG_UST_DISABLE | |
915 | * Disable recording for this event (strong disable) | |
916 | */ | |
917 | static | |
918 | long lttng_event_cmd(int objd, unsigned int cmd, unsigned long arg) | |
919 | { | |
920 | struct ltt_event *event = objd_private(objd); | |
921 | ||
922 | switch (cmd) { | |
923 | case LTTNG_UST_CONTEXT: | |
924 | return lttng_abi_add_context(objd, | |
925 | (struct lttng_ust_context *) arg, | |
926 | &event->ctx, event->chan->session); | |
927 | case LTTNG_UST_ENABLE: | |
928 | return ltt_event_enable(event); | |
929 | case LTTNG_UST_DISABLE: | |
930 | return ltt_event_disable(event); | |
931 | default: | |
932 | return -EINVAL; | |
933 | } | |
934 | } | |
935 | ||
936 | static | |
937 | int lttng_event_release(int objd) | |
938 | { | |
939 | struct ltt_event *event = objd_private(objd); | |
940 | ||
941 | if (event) | |
d4419b81 | 942 | return lttng_ust_objd_unref(event->chan->objd); |
f4681817 MD |
943 | return 0; |
944 | } | |
945 | ||
946 | /* TODO: filter control ioctl */ | |
b61ce3b2 | 947 | static const struct lttng_ust_objd_ops lttng_event_ops = { |
f4681817 MD |
948 | .release = lttng_event_release, |
949 | .cmd = lttng_event_cmd, | |
950 | }; | |
951 | ||
1f18504e MD |
952 | /** |
953 | * lttng_loglevel_cmd - lttng control through object descriptors | |
954 | * | |
955 | * @objd: the object descriptor | |
956 | * @cmd: the command | |
957 | * @arg: command arg | |
958 | * | |
959 | * This object descriptor implements lttng commands: | |
960 | * LTTNG_UST_CONTEXT | |
961 | * Prepend a context field to each record of events of this | |
962 | * loglevel. | |
963 | * LTTNG_UST_ENABLE | |
964 | * Enable recording for these loglevel events (weak enable) | |
965 | * LTTNG_UST_DISABLE | |
966 | * Disable recording for these loglevel events (strong disable) | |
967 | */ | |
968 | static | |
969 | long lttng_loglevel_cmd(int objd, unsigned int cmd, unsigned long arg) | |
970 | { | |
574a6217 | 971 | struct session_loglevel *loglevel = objd_private(objd); |
1f18504e MD |
972 | |
973 | switch (cmd) { | |
974 | case LTTNG_UST_CONTEXT: | |
975 | return -ENOSYS; /* not implemented yet */ | |
976 | #if 0 | |
977 | return lttng_abi_add_context(objd, | |
978 | (struct lttng_ust_context *) arg, | |
979 | &loglevel->ctx, loglevel->chan->session); | |
980 | #endif | |
981 | case LTTNG_UST_ENABLE: | |
982 | return ltt_loglevel_enable(loglevel); | |
983 | case LTTNG_UST_DISABLE: | |
984 | return ltt_loglevel_disable(loglevel); | |
985 | default: | |
986 | return -EINVAL; | |
987 | } | |
988 | } | |
989 | ||
990 | static | |
991 | int lttng_loglevel_release(int objd) | |
992 | { | |
574a6217 | 993 | struct session_loglevel *loglevel = objd_private(objd); |
1f18504e MD |
994 | |
995 | if (loglevel) | |
996 | return lttng_ust_objd_unref(loglevel->chan->objd); | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | /* TODO: filter control ioctl */ | |
1001 | static const struct lttng_ust_objd_ops lttng_loglevel_ops = { | |
1002 | .release = lttng_loglevel_release, | |
1003 | .cmd = lttng_loglevel_cmd, | |
1004 | }; | |
1005 | ||
b35d179d | 1006 | void lttng_ust_abi_exit(void) |
f4681817 | 1007 | { |
45e9e699 | 1008 | lttng_ust_abi_close_in_progress = 1; |
f4681817 | 1009 | objd_table_destroy(); |
45e9e699 | 1010 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1011 | } |