Commit | Line | Data |
---|---|---|
f4681817 MD |
1 | /* |
2 | * lttng-ust-abi.c | |
3 | * | |
f4681817 MD |
4 | * LTTng UST ABI |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | * | |
22 | * | |
f4681817 MD |
23 | * Mimic system calls for: |
24 | * - session creation, returns an object descriptor or failure. | |
25 | * - channel creation, returns an object descriptor or failure. | |
26 | * - Operates on a session object descriptor | |
27 | * - Takes all channel options as parameters. | |
28 | * - stream get, returns an object descriptor or failure. | |
29 | * - Operates on a channel object descriptor. | |
30 | * - stream notifier get, returns an object descriptor or failure. | |
31 | * - Operates on a channel object descriptor. | |
32 | * - event creation, returns an object descriptor or failure. | |
33 | * - Operates on a channel object descriptor | |
34 | * - Takes an event name as parameter | |
35 | * - Takes an instrumentation source as parameter | |
36 | * - e.g. tracepoints, dynamic_probes... | |
37 | * - Takes instrumentation source specific arguments. | |
f4681817 MD |
38 | */ |
39 | ||
4318ae1b | 40 | #include <lttng/ust-abi.h> |
7bc53e94 | 41 | #include <lttng/ust-error.h> |
f4681817 MD |
42 | #include <urcu/compiler.h> |
43 | #include <urcu/list.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
23c8854a | 45 | #include <lttng/ust-version.h> |
902e1379 | 46 | #include <lttng/tracepoint.h> |
d8de1354 | 47 | #include "tracepoint-internal.h" |
44c72f10 MD |
48 | #include <usterr-signal-safe.h> |
49 | #include <helper.h> | |
7dd08bec | 50 | #include "lttng-tracer.h" |
74d81a6c MD |
51 | #include "../libringbuffer/shm.h" |
52 | #include "../libringbuffer/frontend_types.h" | |
4ab44fbe | 53 | |
7047f3da MD |
54 | #define OBJ_NAME_LEN 16 |
55 | ||
45e9e699 MD |
56 | static int lttng_ust_abi_close_in_progress; |
57 | ||
51489cad | 58 | static |
f59ed768 | 59 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 60 | static |
f59ed768 | 61 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 62 | |
f4681817 MD |
63 | /* |
64 | * Object descriptor table. Should be protected from concurrent access | |
65 | * by the caller. | |
66 | */ | |
67 | ||
b61ce3b2 | 68 | struct lttng_ust_obj { |
f4681817 MD |
69 | union { |
70 | struct { | |
71 | void *private_data; | |
b61ce3b2 | 72 | const struct lttng_ust_objd_ops *ops; |
f4681817 | 73 | int f_count; |
1849ef7c | 74 | int owner_ref; /* has ref from owner */ |
f59ed768 | 75 | void *owner; |
7047f3da | 76 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
77 | } s; |
78 | int freelist_next; /* offset freelist. end is -1. */ | |
79 | } u; | |
80 | }; | |
81 | ||
b61ce3b2 MD |
82 | struct lttng_ust_objd_table { |
83 | struct lttng_ust_obj *array; | |
f4681817 MD |
84 | unsigned int len, allocated_len; |
85 | int freelist_head; /* offset freelist head. end is -1 */ | |
86 | }; | |
87 | ||
b61ce3b2 | 88 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
89 | .freelist_head = -1, |
90 | }; | |
91 | ||
92 | static | |
f59ed768 | 93 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops, |
7047f3da | 94 | void *owner, const char *name) |
f4681817 | 95 | { |
b61ce3b2 | 96 | struct lttng_ust_obj *obj; |
f4681817 MD |
97 | |
98 | if (objd_table.freelist_head != -1) { | |
99 | obj = &objd_table.array[objd_table.freelist_head]; | |
100 | objd_table.freelist_head = obj->u.freelist_next; | |
101 | goto end; | |
102 | } | |
103 | ||
104 | if (objd_table.len >= objd_table.allocated_len) { | |
105 | unsigned int new_allocated_len, old_allocated_len; | |
b61ce3b2 | 106 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
107 | |
108 | old_allocated_len = objd_table.allocated_len; | |
109 | old_table = objd_table.array; | |
110 | if (!old_allocated_len) | |
111 | new_allocated_len = 1; | |
112 | else | |
113 | new_allocated_len = old_allocated_len << 1; | |
b61ce3b2 | 114 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
115 | if (!new_table) |
116 | return -ENOMEM; | |
117 | memcpy(new_table, old_table, | |
b61ce3b2 | 118 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
119 | free(old_table); |
120 | objd_table.array = new_table; | |
121 | objd_table.allocated_len = new_allocated_len; | |
122 | } | |
123 | obj = &objd_table.array[objd_table.len]; | |
124 | objd_table.len++; | |
125 | end: | |
126 | obj->u.s.private_data = private_data; | |
127 | obj->u.s.ops = ops; | |
a4be8962 MD |
128 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
129 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 130 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 131 | obj->u.s.owner = owner; |
7047f3da MD |
132 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
133 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
134 | return obj - objd_table.array; |
135 | } | |
136 | ||
137 | static | |
b61ce3b2 | 138 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
139 | { |
140 | if (id >= objd_table.len) | |
141 | return NULL; | |
a4be8962 MD |
142 | if (!objd_table.array[id].u.s.f_count) |
143 | return NULL; | |
f4681817 MD |
144 | return &objd_table.array[id]; |
145 | } | |
146 | ||
147 | static | |
148 | void *objd_private(int id) | |
149 | { | |
b61ce3b2 | 150 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
151 | assert(obj); |
152 | return obj->u.s.private_data; | |
153 | } | |
154 | ||
155 | static | |
156 | void objd_set_private(int id, void *private_data) | |
157 | { | |
b61ce3b2 | 158 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
159 | assert(obj); |
160 | obj->u.s.private_data = private_data; | |
161 | } | |
162 | ||
b61ce3b2 | 163 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 164 | { |
b61ce3b2 | 165 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 166 | |
a4be8962 MD |
167 | if (!obj) |
168 | return NULL; | |
f4681817 MD |
169 | return obj->u.s.ops; |
170 | } | |
171 | ||
172 | static | |
173 | void objd_free(int id) | |
174 | { | |
b61ce3b2 | 175 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
176 | |
177 | assert(obj); | |
178 | obj->u.freelist_next = objd_table.freelist_head; | |
179 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
180 | assert(obj->u.s.f_count == 1); |
181 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
182 | } |
183 | ||
184 | static | |
185 | void objd_ref(int id) | |
186 | { | |
b61ce3b2 | 187 | struct lttng_ust_obj *obj = _objd_get(id); |
072886c4 | 188 | assert(obj != NULL); |
f4681817 MD |
189 | obj->u.s.f_count++; |
190 | } | |
191 | ||
1849ef7c | 192 | int lttng_ust_objd_unref(int id, int is_owner) |
f4681817 | 193 | { |
b61ce3b2 | 194 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 195 | |
1ea11eab MD |
196 | if (!obj) |
197 | return -EINVAL; | |
a4be8962 MD |
198 | if (obj->u.s.f_count == 1) { |
199 | ERR("Reference counting error\n"); | |
200 | return -EINVAL; | |
201 | } | |
1849ef7c MD |
202 | if (is_owner) { |
203 | if (!obj->u.s.owner_ref) { | |
204 | ERR("Error decrementing owner reference"); | |
205 | return -EINVAL; | |
206 | } | |
207 | obj->u.s.owner_ref--; | |
208 | } | |
a4be8962 | 209 | if ((--obj->u.s.f_count) == 1) { |
b61ce3b2 | 210 | const struct lttng_ust_objd_ops *ops = objd_ops(id); |
a4be8962 | 211 | |
f4681817 MD |
212 | if (ops->release) |
213 | ops->release(id); | |
214 | objd_free(id); | |
215 | } | |
1ea11eab | 216 | return 0; |
f4681817 MD |
217 | } |
218 | ||
219 | static | |
220 | void objd_table_destroy(void) | |
221 | { | |
a4be8962 MD |
222 | int i; |
223 | ||
1849ef7c MD |
224 | for (i = 0; i < objd_table.allocated_len; i++) { |
225 | struct lttng_ust_obj *obj; | |
226 | ||
227 | obj = _objd_get(i); | |
228 | if (!obj) | |
229 | continue; | |
230 | if (!obj->u.s.owner_ref) | |
231 | continue; /* only unref owner ref. */ | |
232 | (void) lttng_ust_objd_unref(i, 1); | |
233 | } | |
f4681817 | 234 | free(objd_table.array); |
02fb3381 MD |
235 | objd_table.array = NULL; |
236 | objd_table.len = 0; | |
237 | objd_table.allocated_len = 0; | |
17dfb34b | 238 | objd_table.freelist_head = -1; |
f4681817 MD |
239 | } |
240 | ||
74d81a6c MD |
241 | const char *lttng_ust_obj_get_name(int id) |
242 | { | |
243 | struct lttng_ust_obj *obj = _objd_get(id); | |
244 | ||
245 | if (!obj) | |
246 | return NULL; | |
247 | return obj->u.s.name; | |
248 | } | |
249 | ||
f59ed768 MD |
250 | void lttng_ust_objd_table_owner_cleanup(void *owner) |
251 | { | |
252 | int i; | |
253 | ||
254 | for (i = 0; i < objd_table.allocated_len; i++) { | |
255 | struct lttng_ust_obj *obj; | |
256 | ||
257 | obj = _objd_get(i); | |
258 | if (!obj) | |
259 | continue; | |
260 | if (!obj->u.s.owner) | |
261 | continue; /* skip root handles */ | |
1849ef7c MD |
262 | if (!obj->u.s.owner_ref) |
263 | continue; /* only unref owner ref. */ | |
f59ed768 | 264 | if (obj->u.s.owner == owner) |
1849ef7c | 265 | (void) lttng_ust_objd_unref(i, 1); |
f59ed768 MD |
266 | } |
267 | } | |
268 | ||
f4681817 MD |
269 | /* |
270 | * This is LTTng's own personal way to create an ABI for sessiond. | |
271 | * We send commands over a socket. | |
272 | */ | |
273 | ||
b61ce3b2 MD |
274 | static const struct lttng_ust_objd_ops lttng_ops; |
275 | static const struct lttng_ust_objd_ops lttng_session_ops; | |
276 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
e58095ef | 277 | static const struct lttng_ust_objd_ops lttng_enabler_ops; |
51489cad | 278 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
06d4f27e | 279 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops; |
f4681817 | 280 | |
46050b1a MD |
281 | int lttng_abi_create_root_handle(void) |
282 | { | |
283 | int root_handle; | |
284 | ||
f59ed768 | 285 | /* root handles have NULL owners */ |
7047f3da | 286 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
287 | return root_handle; |
288 | } | |
289 | ||
74d81a6c MD |
290 | static |
291 | int lttng_is_channel_ready(struct lttng_channel *lttng_chan) | |
292 | { | |
293 | struct channel *chan; | |
294 | unsigned int nr_streams, exp_streams; | |
295 | ||
296 | chan = lttng_chan->chan; | |
297 | nr_streams = channel_handle_get_nr_streams(lttng_chan->handle); | |
298 | exp_streams = chan->nr_streams; | |
299 | return nr_streams == exp_streams; | |
300 | } | |
301 | ||
818173b9 | 302 | static |
f59ed768 | 303 | int lttng_abi_create_session(void *owner) |
f4681817 | 304 | { |
7dd08bec | 305 | struct lttng_session *session; |
f4681817 MD |
306 | int session_objd, ret; |
307 | ||
7dd08bec | 308 | session = lttng_session_create(); |
f4681817 MD |
309 | if (!session) |
310 | return -ENOMEM; | |
7047f3da | 311 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
312 | if (session_objd < 0) { |
313 | ret = session_objd; | |
314 | goto objd_error; | |
315 | } | |
316 | session->objd = session_objd; | |
32ce8569 | 317 | session->owner = owner; |
f4681817 MD |
318 | return session_objd; |
319 | ||
320 | objd_error: | |
7dd08bec | 321 | lttng_session_destroy(session); |
f4681817 MD |
322 | return ret; |
323 | } | |
324 | ||
f4681817 MD |
325 | static |
326 | long lttng_abi_tracer_version(int objd, | |
327 | struct lttng_ust_tracer_version *v) | |
328 | { | |
32ce8569 MD |
329 | v->major = LTTNG_UST_MAJOR_VERSION; |
330 | v->minor = LTTNG_UST_MINOR_VERSION; | |
331 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
332 | return 0; |
333 | } | |
334 | ||
335 | static | |
336 | long lttng_abi_add_context(int objd, | |
337 | struct lttng_ust_context *context_param, | |
7dd08bec | 338 | struct lttng_ctx **ctx, struct lttng_session *session) |
f4681817 | 339 | { |
e58095ef | 340 | return lttng_attach_context(context_param, ctx, session); |
f4681817 MD |
341 | } |
342 | ||
343 | /** | |
344 | * lttng_cmd - lttng control through socket commands | |
345 | * | |
346 | * @objd: the object descriptor | |
347 | * @cmd: the command | |
348 | * @arg: command arg | |
ef9ff354 | 349 | * @uargs: UST arguments (internal) |
f59ed768 | 350 | * @owner: objd owner |
f4681817 MD |
351 | * |
352 | * This descriptor implements lttng commands: | |
353 | * LTTNG_UST_SESSION | |
354 | * Returns a LTTng trace session object descriptor | |
355 | * LTTNG_UST_TRACER_VERSION | |
356 | * Returns the LTTng kernel tracer version | |
357 | * LTTNG_UST_TRACEPOINT_LIST | |
358 | * Returns a file descriptor listing available tracepoints | |
06d4f27e MD |
359 | * LTTNG_UST_TRACEPOINT_FIELD_LIST |
360 | * Returns a file descriptor listing available tracepoint fields | |
f4681817 MD |
361 | * LTTNG_UST_WAIT_QUIESCENT |
362 | * Returns after all previously running probes have completed | |
363 | * | |
364 | * The returned session will be deleted when its file descriptor is closed. | |
365 | */ | |
366 | static | |
ef9ff354 | 367 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 368 | union ust_args *uargs, void *owner) |
f4681817 MD |
369 | { |
370 | switch (cmd) { | |
371 | case LTTNG_UST_SESSION: | |
f59ed768 | 372 | return lttng_abi_create_session(owner); |
f4681817 MD |
373 | case LTTNG_UST_TRACER_VERSION: |
374 | return lttng_abi_tracer_version(objd, | |
375 | (struct lttng_ust_tracer_version *) arg); | |
376 | case LTTNG_UST_TRACEPOINT_LIST: | |
f59ed768 | 377 | return lttng_abi_tracepoint_list(owner); |
06d4f27e | 378 | case LTTNG_UST_TRACEPOINT_FIELD_LIST: |
f59ed768 | 379 | return lttng_abi_tracepoint_field_list(owner); |
f4681817 MD |
380 | case LTTNG_UST_WAIT_QUIESCENT: |
381 | synchronize_trace(); | |
382 | return 0; | |
383 | default: | |
384 | return -EINVAL; | |
385 | } | |
386 | } | |
387 | ||
b61ce3b2 | 388 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
389 | .cmd = lttng_cmd, |
390 | }; | |
391 | ||
74d81a6c MD |
392 | int lttng_abi_map_channel(int session_objd, |
393 | struct lttng_ust_channel *ust_chan, | |
394 | union ust_args *uargs, | |
395 | void *owner) | |
f4681817 | 396 | { |
7dd08bec | 397 | struct lttng_session *session = objd_private(session_objd); |
f4681817 | 398 | const char *transport_name; |
74d81a6c MD |
399 | const struct lttng_transport *transport; |
400 | const char *chan_name; | |
f4681817 | 401 | int chan_objd; |
74d81a6c MD |
402 | struct lttng_ust_shm_handle *channel_handle; |
403 | struct lttng_channel *lttng_chan; | |
404 | struct channel *chan; | |
405 | struct lttng_ust_lib_ring_buffer_config *config; | |
406 | void *chan_data; | |
ff0f5728 | 407 | int wakeup_fd; |
74d81a6c MD |
408 | uint64_t len; |
409 | int ret; | |
410 | enum lttng_ust_chan_type type; | |
411 | ||
412 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 413 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
414 | len = ust_chan->len; |
415 | type = ust_chan->type; | |
416 | ||
417 | switch (type) { | |
418 | case LTTNG_UST_CHAN_PER_CPU: | |
74d81a6c MD |
419 | break; |
420 | default: | |
ff0f5728 MD |
421 | ret = -EINVAL; |
422 | goto invalid; | |
74d81a6c MD |
423 | } |
424 | ||
425 | if (session->been_active) { | |
426 | ret = -EBUSY; | |
427 | goto active; /* Refuse to add channel to active session */ | |
428 | } | |
f4681817 | 429 | |
ff0f5728 | 430 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
431 | if (!channel_handle) { |
432 | ret = -EINVAL; | |
433 | goto handle_error; | |
434 | } | |
435 | ||
436 | chan = shmp(channel_handle, channel_handle->chan); | |
437 | assert(chan); | |
03d2d293 | 438 | chan->handle = channel_handle; |
74d81a6c MD |
439 | config = &chan->backend.config; |
440 | lttng_chan = channel_get_private(chan); | |
441 | if (!lttng_chan) { | |
442 | ret = -EINVAL; | |
443 | goto alloc_error; | |
444 | } | |
445 | ||
446 | /* Lookup transport name */ | |
447 | switch (type) { | |
448 | case LTTNG_UST_CHAN_PER_CPU: | |
449 | if (config->output == RING_BUFFER_MMAP) { | |
34a91bdb MD |
450 | if (config->mode == RING_BUFFER_OVERWRITE) { |
451 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
452 | transport_name = "relay-overwrite-mmap"; | |
453 | } else { | |
454 | transport_name = "relay-overwrite-rt-mmap"; | |
455 | } | |
456 | } else { | |
457 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
458 | transport_name = "relay-discard-mmap"; | |
459 | } else { | |
460 | transport_name = "relay-discard-rt-mmap"; | |
461 | } | |
462 | } | |
f4681817 | 463 | } else { |
74d81a6c MD |
464 | ret = -EINVAL; |
465 | goto notransport; | |
f4681817 | 466 | } |
74d81a6c | 467 | chan_name = "channel"; |
f4681817 | 468 | break; |
f4681817 | 469 | default: |
74d81a6c MD |
470 | ret = -EINVAL; |
471 | goto notransport; | |
fe38d4af | 472 | } |
74d81a6c MD |
473 | transport = lttng_transport_find(transport_name); |
474 | if (!transport) { | |
475 | DBG("LTTng transport %s not found\n", | |
476 | transport_name); | |
477 | ret = -EINVAL; | |
478 | goto notransport; | |
479 | } | |
480 | ||
481 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
482 | if (chan_objd < 0) { |
483 | ret = chan_objd; | |
484 | goto objd_error; | |
f4681817 | 485 | } |
74d81a6c MD |
486 | |
487 | /* Initialize our lttng chan */ | |
488 | lttng_chan->chan = chan; | |
ac6b4ac6 | 489 | lttng_chan->tstate = 1; |
74d81a6c MD |
490 | lttng_chan->enabled = 1; |
491 | lttng_chan->ctx = NULL; | |
492 | lttng_chan->session = session; | |
74d81a6c MD |
493 | lttng_chan->ops = &transport->ops; |
494 | memcpy(<tng_chan->chan->backend.config, | |
495 | transport->client_config, | |
496 | sizeof(lttng_chan->chan->backend.config)); | |
497 | cds_list_add(<tng_chan->node, &session->chan_head); | |
498 | lttng_chan->header_type = 0; | |
499 | lttng_chan->handle = channel_handle; | |
74d81a6c MD |
500 | lttng_chan->type = type; |
501 | ||
f4681817 MD |
502 | /* |
503 | * We tolerate no failure path after channel creation. It will stay | |
504 | * invariant for the rest of the session. | |
505 | */ | |
74d81a6c MD |
506 | objd_set_private(chan_objd, lttng_chan); |
507 | lttng_chan->objd = chan_objd; | |
f4681817 MD |
508 | /* The channel created holds a reference on the session */ |
509 | objd_ref(session_objd); | |
f4681817 MD |
510 | return chan_objd; |
511 | ||
ff0f5728 | 512 | /* error path after channel was created */ |
f4681817 | 513 | objd_error: |
74d81a6c MD |
514 | notransport: |
515 | free(lttng_chan); | |
516 | alloc_error: | |
517 | channel_destroy(chan, channel_handle, 0); | |
ff0f5728 MD |
518 | return ret; |
519 | ||
520 | /* | |
521 | * error path before channel creation (owning chan_data and | |
522 | * wakeup_fd). | |
523 | */ | |
74d81a6c MD |
524 | handle_error: |
525 | active: | |
ff0f5728 MD |
526 | invalid: |
527 | { | |
528 | int close_ret; | |
529 | ||
530 | close_ret = close(wakeup_fd); | |
531 | if (close_ret) { | |
532 | PERROR("close"); | |
533 | } | |
534 | } | |
535 | free(chan_data); | |
f4681817 MD |
536 | return ret; |
537 | } | |
538 | ||
539 | /** | |
540 | * lttng_session_cmd - lttng session object command | |
541 | * | |
542 | * @obj: the object | |
543 | * @cmd: the command | |
544 | * @arg: command arg | |
ef9ff354 | 545 | * @uargs: UST arguments (internal) |
f59ed768 | 546 | * @owner: objd owner |
f4681817 MD |
547 | * |
548 | * This descriptor implements lttng commands: | |
549 | * LTTNG_UST_CHANNEL | |
550 | * Returns a LTTng channel object descriptor | |
551 | * LTTNG_UST_ENABLE | |
552 | * Enables tracing for a session (weak enable) | |
553 | * LTTNG_UST_DISABLE | |
554 | * Disables tracing for a session (strong disable) | |
f4681817 MD |
555 | * |
556 | * The returned channel will be deleted when its file descriptor is closed. | |
557 | */ | |
558 | static | |
ef9ff354 | 559 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 560 | union ust_args *uargs, void *owner) |
f4681817 | 561 | { |
7dd08bec | 562 | struct lttng_session *session = objd_private(objd); |
f4681817 MD |
563 | |
564 | switch (cmd) { | |
565 | case LTTNG_UST_CHANNEL: | |
74d81a6c | 566 | return lttng_abi_map_channel(objd, |
f4681817 | 567 | (struct lttng_ust_channel *) arg, |
74d81a6c | 568 | uargs, owner); |
f4681817 MD |
569 | case LTTNG_UST_SESSION_START: |
570 | case LTTNG_UST_ENABLE: | |
7dd08bec | 571 | return lttng_session_enable(session); |
f4681817 MD |
572 | case LTTNG_UST_SESSION_STOP: |
573 | case LTTNG_UST_DISABLE: | |
7dd08bec | 574 | return lttng_session_disable(session); |
f4681817 MD |
575 | default: |
576 | return -EINVAL; | |
577 | } | |
578 | } | |
579 | ||
580 | /* | |
581 | * Called when the last file reference is dropped. | |
582 | * | |
583 | * Big fat note: channels and events are invariant for the whole session after | |
584 | * their creation. So this session destruction also destroys all channel and | |
585 | * event structures specific to this session (they are not destroyed when their | |
586 | * individual file is released). | |
587 | */ | |
588 | static | |
1ea11eab | 589 | int lttng_release_session(int objd) |
f4681817 | 590 | { |
7dd08bec | 591 | struct lttng_session *session = objd_private(objd); |
f4681817 | 592 | |
1ea11eab | 593 | if (session) { |
7dd08bec | 594 | lttng_session_destroy(session); |
1ea11eab MD |
595 | return 0; |
596 | } else { | |
597 | return -EINVAL; | |
598 | } | |
f4681817 MD |
599 | } |
600 | ||
b61ce3b2 | 601 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 602 | .release = lttng_release_session, |
f4681817 MD |
603 | .cmd = lttng_session_cmd, |
604 | }; | |
605 | ||
51489cad | 606 | static |
ef9ff354 | 607 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 608 | union ust_args *uargs, void *owner) |
51489cad | 609 | { |
c8fcf224 | 610 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
cbef6901 MD |
611 | struct lttng_ust_tracepoint_iter *tp = |
612 | (struct lttng_ust_tracepoint_iter *) arg; | |
c8fcf224 | 613 | struct lttng_ust_tracepoint_iter *iter; |
51489cad MD |
614 | |
615 | switch (cmd) { | |
616 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
c8fcf224 | 617 | { |
c8fcf224 MD |
618 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
619 | if (!iter) | |
7bc53e94 | 620 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 621 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 622 | return 0; |
c8fcf224 | 623 | } |
51489cad MD |
624 | default: |
625 | return -EINVAL; | |
626 | } | |
627 | } | |
628 | ||
629 | static | |
f59ed768 | 630 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
631 | { |
632 | int list_objd, ret; | |
c8fcf224 | 633 | struct lttng_ust_tracepoint_list *list; |
51489cad | 634 | |
7047f3da | 635 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
636 | if (list_objd < 0) { |
637 | ret = list_objd; | |
638 | goto objd_error; | |
639 | } | |
640 | list = zmalloc(sizeof(*list)); | |
641 | if (!list) { | |
642 | ret = -ENOMEM; | |
643 | goto alloc_error; | |
644 | } | |
645 | objd_set_private(list_objd, list); | |
646 | ||
c8fcf224 | 647 | /* populate list by walking on all registered probes. */ |
7dd08bec | 648 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
649 | if (ret) { |
650 | goto list_error; | |
651 | } | |
51489cad MD |
652 | return list_objd; |
653 | ||
c8fcf224 MD |
654 | list_error: |
655 | free(list); | |
51489cad MD |
656 | alloc_error: |
657 | { | |
658 | int err; | |
659 | ||
1849ef7c | 660 | err = lttng_ust_objd_unref(list_objd, 1); |
51489cad MD |
661 | assert(!err); |
662 | } | |
663 | objd_error: | |
664 | return ret; | |
665 | } | |
666 | ||
667 | static | |
668 | int lttng_release_tracepoint_list(int objd) | |
669 | { | |
c8fcf224 | 670 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
671 | |
672 | if (list) { | |
7dd08bec | 673 | lttng_probes_prune_event_list(list); |
51489cad MD |
674 | free(list); |
675 | return 0; | |
676 | } else { | |
677 | return -EINVAL; | |
678 | } | |
679 | } | |
680 | ||
681 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
682 | .release = lttng_release_tracepoint_list, | |
683 | .cmd = lttng_tracepoint_list_cmd, | |
684 | }; | |
685 | ||
06d4f27e MD |
686 | static |
687 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
f59ed768 | 688 | unsigned long arg, union ust_args *uargs, void *owner) |
06d4f27e MD |
689 | { |
690 | struct lttng_ust_field_list *list = objd_private(objd); | |
40003310 | 691 | struct lttng_ust_field_iter *tp = &uargs->field_list.entry; |
06d4f27e MD |
692 | struct lttng_ust_field_iter *iter; |
693 | ||
694 | switch (cmd) { | |
695 | case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET: | |
696 | { | |
06d4f27e MD |
697 | iter = lttng_ust_field_list_get_iter_next(list); |
698 | if (!iter) | |
7bc53e94 | 699 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
700 | memcpy(tp, iter, sizeof(*tp)); |
701 | return 0; | |
702 | } | |
703 | default: | |
704 | return -EINVAL; | |
705 | } | |
706 | } | |
707 | ||
708 | static | |
f59ed768 | 709 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
710 | { |
711 | int list_objd, ret; | |
712 | struct lttng_ust_field_list *list; | |
713 | ||
7047f3da MD |
714 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
715 | "tp_field_list"); | |
06d4f27e MD |
716 | if (list_objd < 0) { |
717 | ret = list_objd; | |
718 | goto objd_error; | |
719 | } | |
720 | list = zmalloc(sizeof(*list)); | |
721 | if (!list) { | |
722 | ret = -ENOMEM; | |
723 | goto alloc_error; | |
724 | } | |
725 | objd_set_private(list_objd, list); | |
726 | ||
727 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 728 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
729 | if (ret) { |
730 | goto list_error; | |
731 | } | |
732 | return list_objd; | |
733 | ||
734 | list_error: | |
735 | free(list); | |
736 | alloc_error: | |
737 | { | |
738 | int err; | |
739 | ||
1849ef7c | 740 | err = lttng_ust_objd_unref(list_objd, 1); |
06d4f27e MD |
741 | assert(!err); |
742 | } | |
743 | objd_error: | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static | |
748 | int lttng_release_tracepoint_field_list(int objd) | |
749 | { | |
750 | struct lttng_ust_field_list *list = objd_private(objd); | |
751 | ||
752 | if (list) { | |
7dd08bec | 753 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
754 | free(list); |
755 | return 0; | |
756 | } else { | |
757 | return -EINVAL; | |
758 | } | |
759 | } | |
760 | ||
761 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops = { | |
762 | .release = lttng_release_tracepoint_field_list, | |
763 | .cmd = lttng_tracepoint_field_list_cmd, | |
764 | }; | |
765 | ||
f4681817 | 766 | static |
74d81a6c | 767 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_stream *info, |
f59ed768 | 768 | union ust_args *uargs, void *owner) |
f4681817 | 769 | { |
7dd08bec | 770 | struct lttng_channel *channel = objd_private(channel_objd); |
74d81a6c | 771 | int ret; |
f4681817 | 772 | |
74d81a6c MD |
773 | ret = channel_handle_add_stream(channel->handle, |
774 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, | |
775 | info->stream_nr, info->len); | |
776 | if (ret) | |
777 | goto error_add_stream; | |
778 | ||
779 | return 0; | |
780 | ||
781 | error_add_stream: | |
f4681817 MD |
782 | return ret; |
783 | } | |
f4681817 MD |
784 | |
785 | static | |
e58095ef | 786 | int lttng_abi_create_enabler(int channel_objd, |
f59ed768 | 787 | struct lttng_ust_event *event_param, |
e58095ef MD |
788 | void *owner, |
789 | enum lttng_enabler_type type) | |
f4681817 | 790 | { |
7dd08bec | 791 | struct lttng_channel *channel = objd_private(channel_objd); |
e58095ef | 792 | struct lttng_enabler *enabler; |
f4681817 MD |
793 | int event_objd, ret; |
794 | ||
795 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
7047f3da | 796 | event_objd = objd_alloc(NULL, <tng_enabler_ops, owner, "enabler"); |
f4681817 MD |
797 | if (event_objd < 0) { |
798 | ret = event_objd; | |
799 | goto objd_error; | |
800 | } | |
801 | /* | |
802 | * We tolerate no failure path after event creation. It will stay | |
803 | * invariant for the rest of the session. | |
804 | */ | |
e58095ef MD |
805 | enabler = lttng_enabler_create(type, event_param, channel); |
806 | if (!enabler) { | |
807 | ret = -ENOMEM; | |
f4681817 MD |
808 | goto event_error; |
809 | } | |
e58095ef | 810 | objd_set_private(event_objd, enabler); |
f4681817 MD |
811 | /* The event holds a reference on the channel */ |
812 | objd_ref(channel_objd); | |
813 | return event_objd; | |
814 | ||
815 | event_error: | |
1ea11eab MD |
816 | { |
817 | int err; | |
818 | ||
1849ef7c | 819 | err = lttng_ust_objd_unref(event_objd, 1); |
1ea11eab MD |
820 | assert(!err); |
821 | } | |
f4681817 MD |
822 | objd_error: |
823 | return ret; | |
824 | } | |
825 | ||
826 | /** | |
827 | * lttng_channel_cmd - lttng control through object descriptors | |
828 | * | |
829 | * @objd: the object descriptor | |
830 | * @cmd: the command | |
831 | * @arg: command arg | |
ef9ff354 | 832 | * @uargs: UST arguments (internal) |
f59ed768 | 833 | * @owner: objd owner |
f4681817 MD |
834 | * |
835 | * This object descriptor implements lttng commands: | |
836 | * LTTNG_UST_STREAM | |
837 | * Returns an event stream object descriptor or failure. | |
838 | * (typically, one event stream records events from one CPU) | |
839 | * LTTNG_UST_EVENT | |
840 | * Returns an event object descriptor or failure. | |
841 | * LTTNG_UST_CONTEXT | |
842 | * Prepend a context field to each event in the channel | |
843 | * LTTNG_UST_ENABLE | |
844 | * Enable recording for events in this channel (weak enable) | |
845 | * LTTNG_UST_DISABLE | |
846 | * Disable recording for events in this channel (strong disable) | |
847 | * | |
848 | * Channel and event file descriptors also hold a reference on the session. | |
849 | */ | |
850 | static | |
ef9ff354 | 851 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 852 | union ust_args *uargs, void *owner) |
f4681817 | 853 | { |
7dd08bec | 854 | struct lttng_channel *channel = objd_private(objd); |
f4681817 | 855 | |
74d81a6c MD |
856 | if (cmd != LTTNG_UST_STREAM) { |
857 | /* | |
858 | * Check if channel received all streams. | |
859 | */ | |
860 | if (!lttng_is_channel_ready(channel)) | |
861 | return -EPERM; | |
862 | } | |
863 | ||
f4681817 MD |
864 | switch (cmd) { |
865 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
866 | { |
867 | struct lttng_ust_stream *stream; | |
868 | ||
869 | stream = (struct lttng_ust_stream *) arg; | |
870 | /* stream used as output */ | |
74d81a6c | 871 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 872 | } |
f4681817 | 873 | case LTTNG_UST_EVENT: |
1f18504e MD |
874 | { |
875 | struct lttng_ust_event *event_param = | |
876 | (struct lttng_ust_event *) arg; | |
6b0e60f1 MD |
877 | if (event_param->name[strlen(event_param->name) - 1] == '*') { |
878 | /* If ends with wildcard, create wildcard. */ | |
e58095ef MD |
879 | return lttng_abi_create_enabler(objd, event_param, |
880 | owner, LTTNG_ENABLER_WILDCARD); | |
1f18504e | 881 | } else { |
e58095ef MD |
882 | return lttng_abi_create_enabler(objd, event_param, |
883 | owner, LTTNG_ENABLER_EVENT); | |
1f18504e MD |
884 | } |
885 | } | |
f4681817 MD |
886 | case LTTNG_UST_CONTEXT: |
887 | return lttng_abi_add_context(objd, | |
888 | (struct lttng_ust_context *) arg, | |
889 | &channel->ctx, channel->session); | |
890 | case LTTNG_UST_ENABLE: | |
7dd08bec | 891 | return lttng_channel_enable(channel); |
f4681817 | 892 | case LTTNG_UST_DISABLE: |
7dd08bec | 893 | return lttng_channel_disable(channel); |
43d330a4 MD |
894 | case LTTNG_UST_FLUSH_BUFFER: |
895 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
896 | default: |
897 | return -EINVAL; | |
898 | } | |
899 | } | |
900 | ||
f4681817 MD |
901 | static |
902 | int lttng_channel_release(int objd) | |
903 | { | |
7dd08bec | 904 | struct lttng_channel *channel = objd_private(objd); |
f4681817 MD |
905 | |
906 | if (channel) | |
1849ef7c | 907 | return lttng_ust_objd_unref(channel->session->objd, 0); |
f4681817 MD |
908 | return 0; |
909 | } | |
910 | ||
b61ce3b2 | 911 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 | 912 | .release = lttng_channel_release, |
f4681817 MD |
913 | .cmd = lttng_channel_cmd, |
914 | }; | |
915 | ||
f4681817 | 916 | /** |
e58095ef | 917 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
918 | * |
919 | * @objd: the object descriptor | |
920 | * @cmd: the command | |
921 | * @arg: command arg | |
ef9ff354 | 922 | * @uargs: UST arguments (internal) |
f59ed768 | 923 | * @owner: objd owner |
e6c12e3d MD |
924 | * |
925 | * This object descriptor implements lttng commands: | |
926 | * LTTNG_UST_CONTEXT | |
927 | * Prepend a context field to each record of events of this | |
e58095ef | 928 | * enabler. |
e6c12e3d | 929 | * LTTNG_UST_ENABLE |
e58095ef | 930 | * Enable recording for this enabler |
e6c12e3d | 931 | * LTTNG_UST_DISABLE |
e58095ef | 932 | * Disable recording for this enabler |
2d78951a | 933 | * LTTNG_UST_FILTER |
e58095ef | 934 | * Attach a filter to an enabler. |
0bfb5cbd JI |
935 | * LTTNG_UST_EXCLUSION |
936 | * Attach exclusions to an enabler. | |
e6c12e3d MD |
937 | */ |
938 | static | |
e58095ef | 939 | long lttng_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 940 | union ust_args *uargs, void *owner) |
e6c12e3d | 941 | { |
e58095ef | 942 | struct lttng_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
943 | |
944 | switch (cmd) { | |
945 | case LTTNG_UST_CONTEXT: | |
e58095ef MD |
946 | return lttng_enabler_attach_context(enabler, |
947 | (struct lttng_ust_context *) arg); | |
e6c12e3d | 948 | case LTTNG_UST_ENABLE: |
e58095ef | 949 | return lttng_enabler_enable(enabler); |
e6c12e3d | 950 | case LTTNG_UST_DISABLE: |
e58095ef | 951 | return lttng_enabler_disable(enabler); |
2d78951a MD |
952 | case LTTNG_UST_FILTER: |
953 | { | |
954 | int ret; | |
955 | ||
e58095ef | 956 | ret = lttng_enabler_attach_bytecode(enabler, |
f488575f | 957 | (struct lttng_ust_filter_bytecode_node *) arg); |
2d78951a MD |
958 | if (ret) |
959 | return ret; | |
2d78951a MD |
960 | return 0; |
961 | } | |
0bfb5cbd JI |
962 | case LTTNG_UST_EXCLUSION: |
963 | { | |
964 | return lttng_enabler_attach_exclusion(enabler, | |
965 | (struct lttng_ust_excluder_node *) arg); | |
966 | } | |
e6c12e3d MD |
967 | default: |
968 | return -EINVAL; | |
969 | } | |
970 | } | |
971 | ||
972 | static | |
e58095ef | 973 | int lttng_enabler_release(int objd) |
e6c12e3d | 974 | { |
e58095ef | 975 | struct lttng_enabler *enabler = objd_private(objd); |
e6c12e3d | 976 | |
e58095ef | 977 | if (enabler) |
1849ef7c | 978 | return lttng_ust_objd_unref(enabler->chan->objd, 0); |
e6c12e3d MD |
979 | return 0; |
980 | } | |
981 | ||
e58095ef MD |
982 | static const struct lttng_ust_objd_ops lttng_enabler_ops = { |
983 | .release = lttng_enabler_release, | |
984 | .cmd = lttng_enabler_cmd, | |
e6c12e3d MD |
985 | }; |
986 | ||
b35d179d | 987 | void lttng_ust_abi_exit(void) |
f4681817 | 988 | { |
45e9e699 | 989 | lttng_ust_abi_close_in_progress = 1; |
aa9e070d | 990 | ust_lock_nocheck(); |
f4681817 | 991 | objd_table_destroy(); |
aa9e070d | 992 | ust_unlock(); |
45e9e699 | 993 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 994 | } |