Commit | Line | Data |
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f4681817 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
f4681817 | 3 | * |
e92f3e28 MD |
4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
5 | * | |
c0c0989a | 6 | * LTTng UST ABI |
e92f3e28 | 7 | * |
f4681817 MD |
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. | |
f4681817 MD |
23 | */ |
24 | ||
3fbec7dc | 25 | #define _LGPL_SOURCE |
d8d2416d | 26 | #include <fcntl.h> |
fb31eb73 | 27 | #include <stdint.h> |
4e79769f | 28 | #include <unistd.h> |
fb31eb73 | 29 | |
f4681817 MD |
30 | #include <urcu/compiler.h> |
31 | #include <urcu/list.h> | |
fb31eb73 FD |
32 | |
33 | #include <helper.h> | |
34 | #include <lttng/tracepoint.h> | |
35 | #include <lttng/ust-abi.h> | |
36 | #include <lttng/ust-error.h> | |
4318ae1b | 37 | #include <lttng/ust-events.h> |
23c8854a | 38 | #include <lttng/ust-version.h> |
6548fca4 | 39 | #include <ust-fd.h> |
44c72f10 | 40 | #include <usterr-signal-safe.h> |
fb31eb73 FD |
41 | |
42 | #include "../libringbuffer/frontend_types.h" | |
43 | #include "../libringbuffer/shm.h" | |
ebabbf58 | 44 | #include "../libcounter/counter.h" |
10544ee8 | 45 | #include "tracepoint-internal.h" |
7dd08bec | 46 | #include "lttng-tracer.h" |
196ec2df | 47 | #include "string-utils.h" |
d871c65b | 48 | #include "ust-events-internal.h" |
4ab44fbe | 49 | |
7047f3da MD |
50 | #define OBJ_NAME_LEN 16 |
51 | ||
45e9e699 MD |
52 | static int lttng_ust_abi_close_in_progress; |
53 | ||
51489cad | 54 | static |
f59ed768 | 55 | int lttng_abi_tracepoint_list(void *owner); |
06d4f27e | 56 | static |
f59ed768 | 57 | int lttng_abi_tracepoint_field_list(void *owner); |
51489cad | 58 | |
f4681817 MD |
59 | /* |
60 | * Object descriptor table. Should be protected from concurrent access | |
61 | * by the caller. | |
62 | */ | |
63 | ||
b61ce3b2 | 64 | struct lttng_ust_obj { |
f4681817 MD |
65 | union { |
66 | struct { | |
67 | void *private_data; | |
b61ce3b2 | 68 | const struct lttng_ust_objd_ops *ops; |
f4681817 | 69 | int f_count; |
1849ef7c | 70 | int owner_ref; /* has ref from owner */ |
f59ed768 | 71 | void *owner; |
7047f3da | 72 | char name[OBJ_NAME_LEN]; |
f4681817 MD |
73 | } s; |
74 | int freelist_next; /* offset freelist. end is -1. */ | |
75 | } u; | |
76 | }; | |
77 | ||
b61ce3b2 MD |
78 | struct lttng_ust_objd_table { |
79 | struct lttng_ust_obj *array; | |
f4681817 MD |
80 | unsigned int len, allocated_len; |
81 | int freelist_head; /* offset freelist head. end is -1 */ | |
82 | }; | |
83 | ||
b61ce3b2 | 84 | static struct lttng_ust_objd_table objd_table = { |
f4681817 MD |
85 | .freelist_head = -1, |
86 | }; | |
87 | ||
88 | static | |
f59ed768 | 89 | int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops, |
7047f3da | 90 | void *owner, const char *name) |
f4681817 | 91 | { |
b61ce3b2 | 92 | struct lttng_ust_obj *obj; |
f4681817 MD |
93 | |
94 | if (objd_table.freelist_head != -1) { | |
95 | obj = &objd_table.array[objd_table.freelist_head]; | |
96 | objd_table.freelist_head = obj->u.freelist_next; | |
97 | goto end; | |
98 | } | |
99 | ||
100 | if (objd_table.len >= objd_table.allocated_len) { | |
101 | unsigned int new_allocated_len, old_allocated_len; | |
b61ce3b2 | 102 | struct lttng_ust_obj *new_table, *old_table; |
f4681817 MD |
103 | |
104 | old_allocated_len = objd_table.allocated_len; | |
105 | old_table = objd_table.array; | |
106 | if (!old_allocated_len) | |
107 | new_allocated_len = 1; | |
108 | else | |
109 | new_allocated_len = old_allocated_len << 1; | |
b61ce3b2 | 110 | new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len); |
f4681817 MD |
111 | if (!new_table) |
112 | return -ENOMEM; | |
113 | memcpy(new_table, old_table, | |
b61ce3b2 | 114 | sizeof(struct lttng_ust_obj) * old_allocated_len); |
f4681817 MD |
115 | free(old_table); |
116 | objd_table.array = new_table; | |
117 | objd_table.allocated_len = new_allocated_len; | |
118 | } | |
119 | obj = &objd_table.array[objd_table.len]; | |
120 | objd_table.len++; | |
121 | end: | |
122 | obj->u.s.private_data = private_data; | |
123 | obj->u.s.ops = ops; | |
a4be8962 MD |
124 | obj->u.s.f_count = 2; /* count == 1 : object is allocated */ |
125 | /* count == 2 : allocated + hold ref */ | |
1849ef7c | 126 | obj->u.s.owner_ref = 1; /* One owner reference */ |
f59ed768 | 127 | obj->u.s.owner = owner; |
7047f3da MD |
128 | strncpy(obj->u.s.name, name, OBJ_NAME_LEN); |
129 | obj->u.s.name[OBJ_NAME_LEN - 1] = '\0'; | |
f4681817 MD |
130 | return obj - objd_table.array; |
131 | } | |
132 | ||
133 | static | |
b61ce3b2 | 134 | struct lttng_ust_obj *_objd_get(int id) |
f4681817 MD |
135 | { |
136 | if (id >= objd_table.len) | |
137 | return NULL; | |
a4be8962 MD |
138 | if (!objd_table.array[id].u.s.f_count) |
139 | return NULL; | |
f4681817 MD |
140 | return &objd_table.array[id]; |
141 | } | |
142 | ||
143 | static | |
144 | void *objd_private(int id) | |
145 | { | |
b61ce3b2 | 146 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
147 | assert(obj); |
148 | return obj->u.s.private_data; | |
149 | } | |
150 | ||
151 | static | |
152 | void objd_set_private(int id, void *private_data) | |
153 | { | |
b61ce3b2 | 154 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
155 | assert(obj); |
156 | obj->u.s.private_data = private_data; | |
157 | } | |
158 | ||
b61ce3b2 | 159 | const struct lttng_ust_objd_ops *objd_ops(int id) |
f4681817 | 160 | { |
b61ce3b2 | 161 | struct lttng_ust_obj *obj = _objd_get(id); |
46050b1a | 162 | |
a4be8962 MD |
163 | if (!obj) |
164 | return NULL; | |
f4681817 MD |
165 | return obj->u.s.ops; |
166 | } | |
167 | ||
168 | static | |
169 | void objd_free(int id) | |
170 | { | |
b61ce3b2 | 171 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 MD |
172 | |
173 | assert(obj); | |
174 | obj->u.freelist_next = objd_table.freelist_head; | |
175 | objd_table.freelist_head = obj - objd_table.array; | |
a4be8962 MD |
176 | assert(obj->u.s.f_count == 1); |
177 | obj->u.s.f_count = 0; /* deallocated */ | |
f4681817 MD |
178 | } |
179 | ||
180 | static | |
181 | void objd_ref(int id) | |
182 | { | |
b61ce3b2 | 183 | struct lttng_ust_obj *obj = _objd_get(id); |
072886c4 | 184 | assert(obj != NULL); |
f4681817 MD |
185 | obj->u.s.f_count++; |
186 | } | |
187 | ||
1849ef7c | 188 | int lttng_ust_objd_unref(int id, int is_owner) |
f4681817 | 189 | { |
b61ce3b2 | 190 | struct lttng_ust_obj *obj = _objd_get(id); |
f4681817 | 191 | |
1ea11eab MD |
192 | if (!obj) |
193 | return -EINVAL; | |
a4be8962 MD |
194 | if (obj->u.s.f_count == 1) { |
195 | ERR("Reference counting error\n"); | |
196 | return -EINVAL; | |
197 | } | |
1849ef7c MD |
198 | if (is_owner) { |
199 | if (!obj->u.s.owner_ref) { | |
200 | ERR("Error decrementing owner reference"); | |
201 | return -EINVAL; | |
202 | } | |
203 | obj->u.s.owner_ref--; | |
204 | } | |
a4be8962 | 205 | if ((--obj->u.s.f_count) == 1) { |
b61ce3b2 | 206 | const struct lttng_ust_objd_ops *ops = objd_ops(id); |
196ec2df | 207 | |
f4681817 MD |
208 | if (ops->release) |
209 | ops->release(id); | |
210 | objd_free(id); | |
211 | } | |
1ea11eab | 212 | return 0; |
f4681817 MD |
213 | } |
214 | ||
215 | static | |
216 | void objd_table_destroy(void) | |
217 | { | |
a4be8962 MD |
218 | int i; |
219 | ||
1849ef7c MD |
220 | for (i = 0; i < objd_table.allocated_len; i++) { |
221 | struct lttng_ust_obj *obj; | |
222 | ||
223 | obj = _objd_get(i); | |
224 | if (!obj) | |
225 | continue; | |
226 | if (!obj->u.s.owner_ref) | |
227 | continue; /* only unref owner ref. */ | |
228 | (void) lttng_ust_objd_unref(i, 1); | |
229 | } | |
f4681817 | 230 | free(objd_table.array); |
02fb3381 MD |
231 | objd_table.array = NULL; |
232 | objd_table.len = 0; | |
233 | objd_table.allocated_len = 0; | |
17dfb34b | 234 | objd_table.freelist_head = -1; |
f4681817 MD |
235 | } |
236 | ||
74d81a6c MD |
237 | const char *lttng_ust_obj_get_name(int id) |
238 | { | |
239 | struct lttng_ust_obj *obj = _objd_get(id); | |
240 | ||
241 | if (!obj) | |
242 | return NULL; | |
243 | return obj->u.s.name; | |
244 | } | |
245 | ||
f59ed768 MD |
246 | void lttng_ust_objd_table_owner_cleanup(void *owner) |
247 | { | |
248 | int i; | |
249 | ||
250 | for (i = 0; i < objd_table.allocated_len; i++) { | |
251 | struct lttng_ust_obj *obj; | |
252 | ||
253 | obj = _objd_get(i); | |
254 | if (!obj) | |
255 | continue; | |
256 | if (!obj->u.s.owner) | |
257 | continue; /* skip root handles */ | |
1849ef7c MD |
258 | if (!obj->u.s.owner_ref) |
259 | continue; /* only unref owner ref. */ | |
f59ed768 | 260 | if (obj->u.s.owner == owner) |
1849ef7c | 261 | (void) lttng_ust_objd_unref(i, 1); |
f59ed768 MD |
262 | } |
263 | } | |
264 | ||
f4681817 MD |
265 | /* |
266 | * This is LTTng's own personal way to create an ABI for sessiond. | |
267 | * We send commands over a socket. | |
268 | */ | |
269 | ||
b61ce3b2 | 270 | static const struct lttng_ust_objd_ops lttng_ops; |
d8d2416d | 271 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops; |
b61ce3b2 MD |
272 | static const struct lttng_ust_objd_ops lttng_session_ops; |
273 | static const struct lttng_ust_objd_ops lttng_channel_ops; | |
d871c65b | 274 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops; |
d8d2416d | 275 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops; |
51489cad | 276 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops; |
06d4f27e | 277 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops; |
f4681817 | 278 | |
46050b1a MD |
279 | int lttng_abi_create_root_handle(void) |
280 | { | |
281 | int root_handle; | |
282 | ||
f59ed768 | 283 | /* root handles have NULL owners */ |
7047f3da | 284 | root_handle = objd_alloc(NULL, <tng_ops, NULL, "root"); |
46050b1a MD |
285 | return root_handle; |
286 | } | |
287 | ||
74d81a6c MD |
288 | static |
289 | int lttng_is_channel_ready(struct lttng_channel *lttng_chan) | |
290 | { | |
291 | struct channel *chan; | |
292 | unsigned int nr_streams, exp_streams; | |
293 | ||
294 | chan = lttng_chan->chan; | |
295 | nr_streams = channel_handle_get_nr_streams(lttng_chan->handle); | |
296 | exp_streams = chan->nr_streams; | |
297 | return nr_streams == exp_streams; | |
298 | } | |
299 | ||
818173b9 | 300 | static |
f59ed768 | 301 | int lttng_abi_create_session(void *owner) |
f4681817 | 302 | { |
7dd08bec | 303 | struct lttng_session *session; |
f4681817 MD |
304 | int session_objd, ret; |
305 | ||
7dd08bec | 306 | session = lttng_session_create(); |
f4681817 MD |
307 | if (!session) |
308 | return -ENOMEM; | |
7047f3da | 309 | session_objd = objd_alloc(session, <tng_session_ops, owner, "session"); |
f4681817 MD |
310 | if (session_objd < 0) { |
311 | ret = session_objd; | |
312 | goto objd_error; | |
313 | } | |
314 | session->objd = session_objd; | |
32ce8569 | 315 | session->owner = owner; |
f4681817 MD |
316 | return session_objd; |
317 | ||
318 | objd_error: | |
7dd08bec | 319 | lttng_session_destroy(session); |
f4681817 MD |
320 | return ret; |
321 | } | |
322 | ||
f4681817 MD |
323 | static |
324 | long lttng_abi_tracer_version(int objd, | |
325 | struct lttng_ust_tracer_version *v) | |
326 | { | |
32ce8569 MD |
327 | v->major = LTTNG_UST_MAJOR_VERSION; |
328 | v->minor = LTTNG_UST_MINOR_VERSION; | |
329 | v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION; | |
f4681817 MD |
330 | return 0; |
331 | } | |
332 | ||
d8d2416d | 333 | static |
f52e5902 | 334 | int lttng_abi_event_notifier_send_fd(void *owner, int *event_notifier_notif_fd) |
d8d2416d FD |
335 | { |
336 | struct lttng_event_notifier_group *event_notifier_group; | |
f52e5902 | 337 | int event_notifier_group_objd, ret, fd_flag; |
d8d2416d FD |
338 | |
339 | event_notifier_group = lttng_event_notifier_group_create(); | |
340 | if (!event_notifier_group) | |
341 | return -ENOMEM; | |
342 | ||
343 | /* | |
344 | * Set this file descriptor as NON-BLOCKING. | |
345 | */ | |
f52e5902 | 346 | fd_flag = fcntl(*event_notifier_notif_fd, F_GETFL); |
d8d2416d FD |
347 | |
348 | fd_flag |= O_NONBLOCK; | |
349 | ||
f52e5902 | 350 | ret = fcntl(*event_notifier_notif_fd, F_SETFL, fd_flag); |
d8d2416d FD |
351 | if (ret) { |
352 | ret = -errno; | |
353 | goto fd_error; | |
354 | } | |
355 | ||
356 | event_notifier_group_objd = objd_alloc(event_notifier_group, | |
357 | <tng_event_notifier_group_ops, owner, "event_notifier_group"); | |
358 | if (event_notifier_group_objd < 0) { | |
359 | ret = event_notifier_group_objd; | |
360 | goto objd_error; | |
361 | } | |
362 | ||
363 | event_notifier_group->objd = event_notifier_group_objd; | |
364 | event_notifier_group->owner = owner; | |
f52e5902 MD |
365 | event_notifier_group->notification_fd = *event_notifier_notif_fd; |
366 | /* Object descriptor takes ownership of notification fd. */ | |
367 | *event_notifier_notif_fd = -1; | |
d8d2416d FD |
368 | |
369 | return event_notifier_group_objd; | |
370 | ||
371 | objd_error: | |
372 | lttng_event_notifier_group_destroy(event_notifier_group); | |
373 | fd_error: | |
d8d2416d FD |
374 | return ret; |
375 | } | |
376 | ||
f4681817 MD |
377 | static |
378 | long lttng_abi_add_context(int objd, | |
379 | struct lttng_ust_context *context_param, | |
8e696cfa | 380 | union ust_args *uargs, |
7dd08bec | 381 | struct lttng_ctx **ctx, struct lttng_session *session) |
f4681817 | 382 | { |
8e696cfa | 383 | return lttng_attach_context(context_param, uargs, ctx, session); |
f4681817 MD |
384 | } |
385 | ||
386 | /** | |
387 | * lttng_cmd - lttng control through socket commands | |
388 | * | |
389 | * @objd: the object descriptor | |
390 | * @cmd: the command | |
391 | * @arg: command arg | |
ef9ff354 | 392 | * @uargs: UST arguments (internal) |
f59ed768 | 393 | * @owner: objd owner |
f4681817 MD |
394 | * |
395 | * This descriptor implements lttng commands: | |
396 | * LTTNG_UST_SESSION | |
397 | * Returns a LTTng trace session object descriptor | |
398 | * LTTNG_UST_TRACER_VERSION | |
399 | * Returns the LTTng kernel tracer version | |
400 | * LTTNG_UST_TRACEPOINT_LIST | |
401 | * Returns a file descriptor listing available tracepoints | |
06d4f27e MD |
402 | * LTTNG_UST_TRACEPOINT_FIELD_LIST |
403 | * Returns a file descriptor listing available tracepoint fields | |
f4681817 MD |
404 | * LTTNG_UST_WAIT_QUIESCENT |
405 | * Returns after all previously running probes have completed | |
406 | * | |
407 | * The returned session will be deleted when its file descriptor is closed. | |
408 | */ | |
409 | static | |
ef9ff354 | 410 | long lttng_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 411 | union ust_args *uargs, void *owner) |
f4681817 MD |
412 | { |
413 | switch (cmd) { | |
414 | case LTTNG_UST_SESSION: | |
f59ed768 | 415 | return lttng_abi_create_session(owner); |
f4681817 MD |
416 | case LTTNG_UST_TRACER_VERSION: |
417 | return lttng_abi_tracer_version(objd, | |
418 | (struct lttng_ust_tracer_version *) arg); | |
419 | case LTTNG_UST_TRACEPOINT_LIST: | |
f59ed768 | 420 | return lttng_abi_tracepoint_list(owner); |
06d4f27e | 421 | case LTTNG_UST_TRACEPOINT_FIELD_LIST: |
f59ed768 | 422 | return lttng_abi_tracepoint_field_list(owner); |
f4681817 | 423 | case LTTNG_UST_WAIT_QUIESCENT: |
10544ee8 | 424 | lttng_ust_synchronize_trace(); |
f4681817 | 425 | return 0; |
d8d2416d FD |
426 | case LTTNG_UST_EVENT_NOTIFIER_GROUP_CREATE: |
427 | return lttng_abi_event_notifier_send_fd(owner, | |
f52e5902 | 428 | &uargs->event_notifier_handle.event_notifier_notif_fd); |
f4681817 MD |
429 | default: |
430 | return -EINVAL; | |
431 | } | |
432 | } | |
433 | ||
b61ce3b2 | 434 | static const struct lttng_ust_objd_ops lttng_ops = { |
f4681817 MD |
435 | .cmd = lttng_cmd, |
436 | }; | |
437 | ||
04a351cb | 438 | static |
74d81a6c MD |
439 | int lttng_abi_map_channel(int session_objd, |
440 | struct lttng_ust_channel *ust_chan, | |
441 | union ust_args *uargs, | |
442 | void *owner) | |
f4681817 | 443 | { |
7dd08bec | 444 | struct lttng_session *session = objd_private(session_objd); |
f4681817 | 445 | const char *transport_name; |
74d81a6c MD |
446 | const struct lttng_transport *transport; |
447 | const char *chan_name; | |
f4681817 | 448 | int chan_objd; |
74d81a6c MD |
449 | struct lttng_ust_shm_handle *channel_handle; |
450 | struct lttng_channel *lttng_chan; | |
451 | struct channel *chan; | |
452 | struct lttng_ust_lib_ring_buffer_config *config; | |
453 | void *chan_data; | |
ff0f5728 | 454 | int wakeup_fd; |
74d81a6c MD |
455 | uint64_t len; |
456 | int ret; | |
457 | enum lttng_ust_chan_type type; | |
458 | ||
459 | chan_data = uargs->channel.chan_data; | |
ff0f5728 | 460 | wakeup_fd = uargs->channel.wakeup_fd; |
74d81a6c MD |
461 | len = ust_chan->len; |
462 | type = ust_chan->type; | |
463 | ||
464 | switch (type) { | |
465 | case LTTNG_UST_CHAN_PER_CPU: | |
74d81a6c MD |
466 | break; |
467 | default: | |
ff0f5728 MD |
468 | ret = -EINVAL; |
469 | goto invalid; | |
74d81a6c MD |
470 | } |
471 | ||
472 | if (session->been_active) { | |
473 | ret = -EBUSY; | |
474 | goto active; /* Refuse to add channel to active session */ | |
475 | } | |
f4681817 | 476 | |
ff0f5728 | 477 | channel_handle = channel_handle_create(chan_data, len, wakeup_fd); |
74d81a6c MD |
478 | if (!channel_handle) { |
479 | ret = -EINVAL; | |
480 | goto handle_error; | |
481 | } | |
482 | ||
867942fd MD |
483 | /* Ownership of chan_data and wakeup_fd taken by channel handle. */ |
484 | uargs->channel.chan_data = NULL; | |
485 | uargs->channel.wakeup_fd = -1; | |
486 | ||
74d81a6c MD |
487 | chan = shmp(channel_handle, channel_handle->chan); |
488 | assert(chan); | |
03d2d293 | 489 | chan->handle = channel_handle; |
74d81a6c MD |
490 | config = &chan->backend.config; |
491 | lttng_chan = channel_get_private(chan); | |
492 | if (!lttng_chan) { | |
493 | ret = -EINVAL; | |
494 | goto alloc_error; | |
495 | } | |
496 | ||
497 | /* Lookup transport name */ | |
498 | switch (type) { | |
499 | case LTTNG_UST_CHAN_PER_CPU: | |
500 | if (config->output == RING_BUFFER_MMAP) { | |
34a91bdb MD |
501 | if (config->mode == RING_BUFFER_OVERWRITE) { |
502 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
503 | transport_name = "relay-overwrite-mmap"; | |
504 | } else { | |
505 | transport_name = "relay-overwrite-rt-mmap"; | |
506 | } | |
507 | } else { | |
508 | if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) { | |
509 | transport_name = "relay-discard-mmap"; | |
510 | } else { | |
511 | transport_name = "relay-discard-rt-mmap"; | |
512 | } | |
513 | } | |
f4681817 | 514 | } else { |
74d81a6c MD |
515 | ret = -EINVAL; |
516 | goto notransport; | |
f4681817 | 517 | } |
74d81a6c | 518 | chan_name = "channel"; |
f4681817 | 519 | break; |
f4681817 | 520 | default: |
74d81a6c MD |
521 | ret = -EINVAL; |
522 | goto notransport; | |
fe38d4af | 523 | } |
74d81a6c MD |
524 | transport = lttng_transport_find(transport_name); |
525 | if (!transport) { | |
526 | DBG("LTTng transport %s not found\n", | |
527 | transport_name); | |
528 | ret = -EINVAL; | |
529 | goto notransport; | |
530 | } | |
531 | ||
532 | chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name); | |
fe38d4af MD |
533 | if (chan_objd < 0) { |
534 | ret = chan_objd; | |
535 | goto objd_error; | |
f4681817 | 536 | } |
74d81a6c MD |
537 | |
538 | /* Initialize our lttng chan */ | |
539 | lttng_chan->chan = chan; | |
ac6b4ac6 | 540 | lttng_chan->tstate = 1; |
74d81a6c MD |
541 | lttng_chan->enabled = 1; |
542 | lttng_chan->ctx = NULL; | |
543 | lttng_chan->session = session; | |
74d81a6c MD |
544 | lttng_chan->ops = &transport->ops; |
545 | memcpy(<tng_chan->chan->backend.config, | |
546 | transport->client_config, | |
547 | sizeof(lttng_chan->chan->backend.config)); | |
548 | cds_list_add(<tng_chan->node, &session->chan_head); | |
549 | lttng_chan->header_type = 0; | |
550 | lttng_chan->handle = channel_handle; | |
74d81a6c MD |
551 | lttng_chan->type = type; |
552 | ||
f4681817 MD |
553 | /* |
554 | * We tolerate no failure path after channel creation. It will stay | |
555 | * invariant for the rest of the session. | |
556 | */ | |
74d81a6c MD |
557 | objd_set_private(chan_objd, lttng_chan); |
558 | lttng_chan->objd = chan_objd; | |
f4681817 MD |
559 | /* The channel created holds a reference on the session */ |
560 | objd_ref(session_objd); | |
f4681817 MD |
561 | return chan_objd; |
562 | ||
ff0f5728 | 563 | /* error path after channel was created */ |
f4681817 | 564 | objd_error: |
74d81a6c | 565 | notransport: |
74d81a6c MD |
566 | alloc_error: |
567 | channel_destroy(chan, channel_handle, 0); | |
ff0f5728 MD |
568 | return ret; |
569 | ||
74d81a6c MD |
570 | handle_error: |
571 | active: | |
ff0f5728 | 572 | invalid: |
f4681817 MD |
573 | return ret; |
574 | } | |
575 | ||
576 | /** | |
577 | * lttng_session_cmd - lttng session object command | |
578 | * | |
579 | * @obj: the object | |
580 | * @cmd: the command | |
581 | * @arg: command arg | |
ef9ff354 | 582 | * @uargs: UST arguments (internal) |
f59ed768 | 583 | * @owner: objd owner |
f4681817 MD |
584 | * |
585 | * This descriptor implements lttng commands: | |
586 | * LTTNG_UST_CHANNEL | |
587 | * Returns a LTTng channel object descriptor | |
588 | * LTTNG_UST_ENABLE | |
589 | * Enables tracing for a session (weak enable) | |
590 | * LTTNG_UST_DISABLE | |
591 | * Disables tracing for a session (strong disable) | |
f4681817 MD |
592 | * |
593 | * The returned channel will be deleted when its file descriptor is closed. | |
594 | */ | |
595 | static | |
ef9ff354 | 596 | long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 597 | union ust_args *uargs, void *owner) |
f4681817 | 598 | { |
7dd08bec | 599 | struct lttng_session *session = objd_private(objd); |
f4681817 MD |
600 | |
601 | switch (cmd) { | |
602 | case LTTNG_UST_CHANNEL: | |
74d81a6c | 603 | return lttng_abi_map_channel(objd, |
f4681817 | 604 | (struct lttng_ust_channel *) arg, |
74d81a6c | 605 | uargs, owner); |
f4681817 MD |
606 | case LTTNG_UST_SESSION_START: |
607 | case LTTNG_UST_ENABLE: | |
7dd08bec | 608 | return lttng_session_enable(session); |
f4681817 MD |
609 | case LTTNG_UST_SESSION_STOP: |
610 | case LTTNG_UST_DISABLE: | |
7dd08bec | 611 | return lttng_session_disable(session); |
710b8ee3 MD |
612 | case LTTNG_UST_SESSION_STATEDUMP: |
613 | return lttng_session_statedump(session); | |
ebabbf58 MD |
614 | case LTTNG_UST_COUNTER: |
615 | case LTTNG_UST_COUNTER_GLOBAL: | |
616 | case LTTNG_UST_COUNTER_CPU: | |
617 | /* Not implemented yet. */ | |
618 | return -EINVAL; | |
f4681817 MD |
619 | default: |
620 | return -EINVAL; | |
621 | } | |
622 | } | |
623 | ||
624 | /* | |
625 | * Called when the last file reference is dropped. | |
626 | * | |
627 | * Big fat note: channels and events are invariant for the whole session after | |
628 | * their creation. So this session destruction also destroys all channel and | |
629 | * event structures specific to this session (they are not destroyed when their | |
630 | * individual file is released). | |
631 | */ | |
632 | static | |
1ea11eab | 633 | int lttng_release_session(int objd) |
f4681817 | 634 | { |
7dd08bec | 635 | struct lttng_session *session = objd_private(objd); |
f4681817 | 636 | |
1ea11eab | 637 | if (session) { |
7dd08bec | 638 | lttng_session_destroy(session); |
1ea11eab MD |
639 | return 0; |
640 | } else { | |
641 | return -EINVAL; | |
642 | } | |
f4681817 MD |
643 | } |
644 | ||
b61ce3b2 | 645 | static const struct lttng_ust_objd_ops lttng_session_ops = { |
1ea11eab | 646 | .release = lttng_release_session, |
f4681817 MD |
647 | .cmd = lttng_session_cmd, |
648 | }; | |
649 | ||
d8d2416d FD |
650 | static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj, |
651 | void *owner, struct lttng_ust_event_notifier *event_notifier_param, | |
652 | enum lttng_enabler_format_type type) | |
653 | { | |
654 | struct lttng_event_notifier_group *event_notifier_group = | |
655 | objd_private(event_notifier_group_obj); | |
656 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
657 | int event_notifier_objd, ret; | |
658 | ||
659 | event_notifier_param->event.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
660 | event_notifier_objd = objd_alloc(NULL, <tng_event_notifier_enabler_ops, owner, | |
661 | "event_notifier enabler"); | |
662 | if (event_notifier_objd < 0) { | |
663 | ret = event_notifier_objd; | |
664 | goto objd_error; | |
665 | } | |
666 | ||
667 | event_notifier_enabler = lttng_event_notifier_enabler_create( | |
668 | event_notifier_group, type, event_notifier_param); | |
669 | if (!event_notifier_enabler) { | |
670 | ret = -ENOMEM; | |
671 | goto event_notifier_error; | |
672 | } | |
673 | ||
674 | objd_set_private(event_notifier_objd, event_notifier_enabler); | |
675 | /* The event_notifier holds a reference on the event_notifier group. */ | |
676 | objd_ref(event_notifier_enabler->group->objd); | |
677 | ||
678 | return event_notifier_objd; | |
679 | ||
680 | event_notifier_error: | |
681 | { | |
682 | int err; | |
683 | ||
684 | err = lttng_ust_objd_unref(event_notifier_objd, 1); | |
685 | assert(!err); | |
686 | } | |
687 | objd_error: | |
688 | return ret; | |
689 | } | |
690 | ||
691 | static | |
692 | long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, | |
693 | union ust_args *uargs, void *owner) | |
694 | { | |
695 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
696 | switch (cmd) { | |
697 | case LTTNG_UST_FILTER: | |
a56fd376 FD |
698 | return lttng_event_notifier_enabler_attach_filter_bytecode( |
699 | event_notifier_enabler, | |
ab89263e | 700 | (struct lttng_ust_bytecode_node **) arg); |
d8d2416d FD |
701 | case LTTNG_UST_EXCLUSION: |
702 | return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler, | |
e9fe6aad | 703 | (struct lttng_ust_excluder_node **) arg); |
d37ecb3f FD |
704 | case LTTNG_UST_CAPTURE: |
705 | return lttng_event_notifier_enabler_attach_capture_bytecode( | |
706 | event_notifier_enabler, | |
49cde654 | 707 | (struct lttng_ust_bytecode_node **) arg); |
d8d2416d FD |
708 | case LTTNG_UST_ENABLE: |
709 | return lttng_event_notifier_enabler_enable(event_notifier_enabler); | |
710 | case LTTNG_UST_DISABLE: | |
711 | return lttng_event_notifier_enabler_disable(event_notifier_enabler); | |
712 | default: | |
713 | return -EINVAL; | |
714 | } | |
715 | } | |
716 | ||
ebabbf58 MD |
717 | /** |
718 | * lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command | |
719 | * | |
720 | * @obj: the object | |
721 | * @cmd: the command | |
722 | * @arg: command arg | |
723 | * @uargs: UST arguments (internal) | |
724 | * @owner: objd owner | |
725 | * | |
726 | * This descriptor implements lttng commands: | |
727 | * LTTNG_UST_COUNTER_GLOBAL | |
728 | * Return negative error code on error, 0 on success. | |
729 | * LTTNG_UST_COUNTER_CPU | |
730 | * Return negative error code on error, 0 on success. | |
731 | */ | |
732 | static | |
733 | long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg, | |
734 | union ust_args *uargs, void *owner) | |
735 | { | |
ba5b3d2b | 736 | int ret; |
ebabbf58 MD |
737 | struct lttng_counter *counter = objd_private(objd); |
738 | ||
739 | switch (cmd) { | |
740 | case LTTNG_UST_COUNTER_GLOBAL: | |
ba5b3d2b JR |
741 | ret = -EINVAL; /* Unimplemented. */ |
742 | break; | |
ebabbf58 MD |
743 | case LTTNG_UST_COUNTER_CPU: |
744 | { | |
745 | struct lttng_ust_counter_cpu *counter_cpu = | |
746 | (struct lttng_ust_counter_cpu *)arg; | |
ba5b3d2b JR |
747 | |
748 | ret = lttng_counter_set_cpu_shm(counter->counter, | |
ebabbf58 | 749 | counter_cpu->cpu_nr, uargs->counter_shm.shm_fd); |
ba5b3d2b JR |
750 | if (!ret) { |
751 | /* Take ownership of the shm_fd. */ | |
752 | uargs->counter_shm.shm_fd = -1; | |
753 | } | |
754 | break; | |
ebabbf58 MD |
755 | } |
756 | default: | |
ba5b3d2b JR |
757 | ret = -EINVAL; |
758 | break; | |
ebabbf58 | 759 | } |
ba5b3d2b JR |
760 | |
761 | return ret; | |
ebabbf58 MD |
762 | } |
763 | ||
ebedc67b | 764 | LTTNG_HIDDEN |
ebabbf58 MD |
765 | int lttng_release_event_notifier_group_error_counter(int objd) |
766 | { | |
767 | struct lttng_counter *counter = objd_private(objd); | |
768 | ||
769 | if (counter) { | |
770 | return lttng_ust_objd_unref(counter->event_notifier_group->objd, 0); | |
771 | } else { | |
772 | return -EINVAL; | |
773 | } | |
774 | } | |
775 | ||
776 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_error_counter_ops = { | |
777 | .release = lttng_release_event_notifier_group_error_counter, | |
778 | .cmd = lttng_event_notifier_group_error_counter_cmd, | |
779 | }; | |
780 | ||
781 | static | |
782 | int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd, void *owner, | |
783 | struct lttng_ust_counter_conf *error_counter_conf) | |
784 | { | |
785 | const char *counter_transport_name; | |
786 | struct lttng_event_notifier_group *event_notifier_group = | |
787 | objd_private(event_notifier_group_objd); | |
788 | struct lttng_counter *counter; | |
789 | int counter_objd, ret; | |
790 | struct lttng_counter_dimension dimensions[1]; | |
791 | size_t counter_len; | |
792 | ||
793 | if (event_notifier_group->error_counter) | |
794 | return -EBUSY; | |
795 | ||
796 | if (error_counter_conf->arithmetic != LTTNG_UST_COUNTER_ARITHMETIC_MODULAR) | |
797 | return -EINVAL; | |
798 | ||
799 | if (error_counter_conf->number_dimensions != 1) | |
800 | return -EINVAL; | |
801 | ||
802 | switch (error_counter_conf->bitness) { | |
38980ed1 | 803 | case LTTNG_UST_COUNTER_BITNESS_64: |
ebabbf58 MD |
804 | counter_transport_name = "counter-per-cpu-64-modular"; |
805 | break; | |
38980ed1 | 806 | case LTTNG_UST_COUNTER_BITNESS_32: |
ebabbf58 MD |
807 | counter_transport_name = "counter-per-cpu-32-modular"; |
808 | break; | |
809 | default: | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
813 | counter_objd = objd_alloc(NULL, <tng_event_notifier_group_error_counter_ops, owner, | |
814 | "event_notifier group error counter"); | |
815 | if (counter_objd < 0) { | |
816 | ret = counter_objd; | |
817 | goto objd_error; | |
818 | } | |
819 | ||
820 | counter_len = error_counter_conf->dimensions[0].size; | |
821 | dimensions[0].size = counter_len; | |
822 | dimensions[0].underflow_index = 0; | |
823 | dimensions[0].overflow_index = 0; | |
824 | dimensions[0].has_underflow = 0; | |
825 | dimensions[0].has_overflow = 0; | |
826 | ||
827 | counter = lttng_ust_counter_create(counter_transport_name, 1, dimensions); | |
828 | if (!counter) { | |
829 | ret = -EINVAL; | |
830 | goto create_error; | |
831 | } | |
832 | ||
ebabbf58 | 833 | event_notifier_group->error_counter_len = counter_len; |
33f43caa MD |
834 | /* |
835 | * store-release to publish error counter matches load-acquire | |
836 | * in record_error. Ensures the counter is created and the | |
837 | * error_counter_len is set before they are used. | |
838 | * Currently a full memory barrier is used, which could be | |
839 | * turned into acquire-release barriers. | |
840 | */ | |
841 | cmm_smp_mb(); | |
842 | CMM_STORE_SHARED(event_notifier_group->error_counter, counter); | |
ebabbf58 MD |
843 | |
844 | counter->objd = counter_objd; | |
845 | counter->event_notifier_group = event_notifier_group; /* owner */ | |
846 | ||
847 | objd_set_private(counter_objd, counter); | |
848 | /* The error counter holds a reference on the event_notifier group. */ | |
849 | objd_ref(event_notifier_group->objd); | |
850 | ||
851 | return counter_objd; | |
852 | ||
853 | create_error: | |
854 | { | |
855 | int err; | |
856 | ||
857 | err = lttng_ust_objd_unref(counter_objd, 1); | |
858 | assert(!err); | |
859 | } | |
860 | objd_error: | |
861 | return ret; | |
862 | } | |
863 | ||
d8d2416d FD |
864 | static |
865 | long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg, | |
866 | union ust_args *uargs, void *owner) | |
867 | { | |
868 | switch (cmd) { | |
869 | case LTTNG_UST_EVENT_NOTIFIER_CREATE: | |
870 | { | |
871 | struct lttng_ust_event_notifier *event_notifier_param = | |
872 | (struct lttng_ust_event_notifier *) arg; | |
873 | if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) { | |
874 | /* | |
875 | * If the event name is a star globbing pattern, | |
876 | * we create the special star globbing enabler. | |
877 | */ | |
878 | return lttng_ust_event_notifier_enabler_create(objd, | |
879 | owner, event_notifier_param, | |
880 | LTTNG_ENABLER_FORMAT_STAR_GLOB); | |
881 | } else { | |
882 | return lttng_ust_event_notifier_enabler_create(objd, | |
883 | owner, event_notifier_param, | |
884 | LTTNG_ENABLER_FORMAT_EVENT); | |
885 | } | |
886 | } | |
ebabbf58 MD |
887 | case LTTNG_UST_COUNTER: |
888 | { | |
889 | struct lttng_ust_counter_conf *counter_conf = | |
890 | (struct lttng_ust_counter_conf *) uargs->counter.counter_data; | |
891 | return lttng_ust_event_notifier_group_create_error_counter( | |
892 | objd, owner, counter_conf); | |
893 | } | |
d8d2416d FD |
894 | default: |
895 | return -EINVAL; | |
896 | } | |
897 | } | |
898 | ||
899 | static | |
900 | int lttng_event_notifier_enabler_release(int objd) | |
901 | { | |
902 | struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd); | |
903 | ||
904 | if (event_notifier_enabler) | |
905 | return lttng_ust_objd_unref(event_notifier_enabler->group->objd, 0); | |
906 | return 0; | |
907 | } | |
908 | ||
909 | static const struct lttng_ust_objd_ops lttng_event_notifier_enabler_ops = { | |
910 | .release = lttng_event_notifier_enabler_release, | |
911 | .cmd = lttng_event_notifier_enabler_cmd, | |
912 | }; | |
913 | ||
914 | static | |
915 | int lttng_release_event_notifier_group(int objd) | |
916 | { | |
917 | struct lttng_event_notifier_group *event_notifier_group = objd_private(objd); | |
918 | ||
919 | if (event_notifier_group) { | |
920 | lttng_event_notifier_group_destroy(event_notifier_group); | |
921 | return 0; | |
922 | } else { | |
923 | return -EINVAL; | |
924 | } | |
925 | } | |
926 | ||
927 | static const struct lttng_ust_objd_ops lttng_event_notifier_group_ops = { | |
928 | .release = lttng_release_event_notifier_group, | |
929 | .cmd = lttng_event_notifier_group_cmd, | |
930 | }; | |
931 | ||
51489cad | 932 | static |
ef9ff354 | 933 | long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 934 | union ust_args *uargs, void *owner) |
51489cad | 935 | { |
c8fcf224 | 936 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
cbef6901 MD |
937 | struct lttng_ust_tracepoint_iter *tp = |
938 | (struct lttng_ust_tracepoint_iter *) arg; | |
c8fcf224 | 939 | struct lttng_ust_tracepoint_iter *iter; |
51489cad MD |
940 | |
941 | switch (cmd) { | |
942 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
c8fcf224 | 943 | { |
c8fcf224 MD |
944 | iter = lttng_ust_tracepoint_list_get_iter_next(list); |
945 | if (!iter) | |
7bc53e94 | 946 | return -LTTNG_UST_ERR_NOENT; |
c8fcf224 | 947 | memcpy(tp, iter, sizeof(*tp)); |
51489cad | 948 | return 0; |
c8fcf224 | 949 | } |
51489cad MD |
950 | default: |
951 | return -EINVAL; | |
952 | } | |
953 | } | |
954 | ||
955 | static | |
f59ed768 | 956 | int lttng_abi_tracepoint_list(void *owner) |
51489cad MD |
957 | { |
958 | int list_objd, ret; | |
c8fcf224 | 959 | struct lttng_ust_tracepoint_list *list; |
51489cad | 960 | |
7047f3da | 961 | list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list"); |
51489cad MD |
962 | if (list_objd < 0) { |
963 | ret = list_objd; | |
964 | goto objd_error; | |
965 | } | |
966 | list = zmalloc(sizeof(*list)); | |
967 | if (!list) { | |
968 | ret = -ENOMEM; | |
969 | goto alloc_error; | |
970 | } | |
971 | objd_set_private(list_objd, list); | |
972 | ||
c8fcf224 | 973 | /* populate list by walking on all registered probes. */ |
7dd08bec | 974 | ret = lttng_probes_get_event_list(list); |
c8fcf224 MD |
975 | if (ret) { |
976 | goto list_error; | |
977 | } | |
51489cad MD |
978 | return list_objd; |
979 | ||
c8fcf224 MD |
980 | list_error: |
981 | free(list); | |
51489cad MD |
982 | alloc_error: |
983 | { | |
984 | int err; | |
985 | ||
1849ef7c | 986 | err = lttng_ust_objd_unref(list_objd, 1); |
51489cad MD |
987 | assert(!err); |
988 | } | |
989 | objd_error: | |
990 | return ret; | |
991 | } | |
992 | ||
993 | static | |
994 | int lttng_release_tracepoint_list(int objd) | |
995 | { | |
c8fcf224 | 996 | struct lttng_ust_tracepoint_list *list = objd_private(objd); |
51489cad MD |
997 | |
998 | if (list) { | |
7dd08bec | 999 | lttng_probes_prune_event_list(list); |
51489cad MD |
1000 | free(list); |
1001 | return 0; | |
1002 | } else { | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = { | |
1008 | .release = lttng_release_tracepoint_list, | |
1009 | .cmd = lttng_tracepoint_list_cmd, | |
1010 | }; | |
1011 | ||
06d4f27e MD |
1012 | static |
1013 | long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd, | |
f59ed768 | 1014 | unsigned long arg, union ust_args *uargs, void *owner) |
06d4f27e MD |
1015 | { |
1016 | struct lttng_ust_field_list *list = objd_private(objd); | |
40003310 | 1017 | struct lttng_ust_field_iter *tp = &uargs->field_list.entry; |
06d4f27e MD |
1018 | struct lttng_ust_field_iter *iter; |
1019 | ||
1020 | switch (cmd) { | |
1021 | case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET: | |
1022 | { | |
06d4f27e MD |
1023 | iter = lttng_ust_field_list_get_iter_next(list); |
1024 | if (!iter) | |
7bc53e94 | 1025 | return -LTTNG_UST_ERR_NOENT; |
06d4f27e MD |
1026 | memcpy(tp, iter, sizeof(*tp)); |
1027 | return 0; | |
1028 | } | |
1029 | default: | |
1030 | return -EINVAL; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | static | |
f59ed768 | 1035 | int lttng_abi_tracepoint_field_list(void *owner) |
06d4f27e MD |
1036 | { |
1037 | int list_objd, ret; | |
1038 | struct lttng_ust_field_list *list; | |
1039 | ||
7047f3da MD |
1040 | list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner, |
1041 | "tp_field_list"); | |
06d4f27e MD |
1042 | if (list_objd < 0) { |
1043 | ret = list_objd; | |
1044 | goto objd_error; | |
1045 | } | |
1046 | list = zmalloc(sizeof(*list)); | |
1047 | if (!list) { | |
1048 | ret = -ENOMEM; | |
1049 | goto alloc_error; | |
1050 | } | |
1051 | objd_set_private(list_objd, list); | |
1052 | ||
1053 | /* populate list by walking on all registered probes. */ | |
7dd08bec | 1054 | ret = lttng_probes_get_field_list(list); |
06d4f27e MD |
1055 | if (ret) { |
1056 | goto list_error; | |
1057 | } | |
1058 | return list_objd; | |
1059 | ||
1060 | list_error: | |
1061 | free(list); | |
1062 | alloc_error: | |
1063 | { | |
1064 | int err; | |
1065 | ||
1849ef7c | 1066 | err = lttng_ust_objd_unref(list_objd, 1); |
06d4f27e MD |
1067 | assert(!err); |
1068 | } | |
1069 | objd_error: | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | static | |
1074 | int lttng_release_tracepoint_field_list(int objd) | |
1075 | { | |
1076 | struct lttng_ust_field_list *list = objd_private(objd); | |
1077 | ||
1078 | if (list) { | |
7dd08bec | 1079 | lttng_probes_prune_field_list(list); |
06d4f27e MD |
1080 | free(list); |
1081 | return 0; | |
1082 | } else { | |
1083 | return -EINVAL; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops = { | |
1088 | .release = lttng_release_tracepoint_field_list, | |
1089 | .cmd = lttng_tracepoint_field_list_cmd, | |
1090 | }; | |
1091 | ||
f4681817 | 1092 | static |
74d81a6c | 1093 | int lttng_abi_map_stream(int channel_objd, struct lttng_ust_stream *info, |
f59ed768 | 1094 | union ust_args *uargs, void *owner) |
f4681817 | 1095 | { |
7dd08bec | 1096 | struct lttng_channel *channel = objd_private(channel_objd); |
74d81a6c | 1097 | int ret; |
f4681817 | 1098 | |
74d81a6c MD |
1099 | ret = channel_handle_add_stream(channel->handle, |
1100 | uargs->stream.shm_fd, uargs->stream.wakeup_fd, | |
1101 | info->stream_nr, info->len); | |
1102 | if (ret) | |
1103 | goto error_add_stream; | |
118c051e MD |
1104 | /* Take ownership of shm_fd and wakeup_fd. */ |
1105 | uargs->stream.shm_fd = -1; | |
1106 | uargs->stream.wakeup_fd = -1; | |
74d81a6c MD |
1107 | |
1108 | return 0; | |
1109 | ||
1110 | error_add_stream: | |
f4681817 MD |
1111 | return ret; |
1112 | } | |
f4681817 MD |
1113 | |
1114 | static | |
d871c65b | 1115 | int lttng_abi_create_event_enabler(int channel_objd, |
f59ed768 | 1116 | struct lttng_ust_event *event_param, |
e58095ef | 1117 | void *owner, |
e450e339 | 1118 | enum lttng_enabler_format_type format_type) |
f4681817 | 1119 | { |
7dd08bec | 1120 | struct lttng_channel *channel = objd_private(channel_objd); |
d871c65b | 1121 | struct lttng_event_enabler *enabler; |
f4681817 MD |
1122 | int event_objd, ret; |
1123 | ||
1124 | event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
d871c65b FD |
1125 | event_objd = objd_alloc(NULL, <tng_event_enabler_ops, owner, |
1126 | "event enabler"); | |
f4681817 MD |
1127 | if (event_objd < 0) { |
1128 | ret = event_objd; | |
1129 | goto objd_error; | |
1130 | } | |
1131 | /* | |
1132 | * We tolerate no failure path after event creation. It will stay | |
1133 | * invariant for the rest of the session. | |
1134 | */ | |
d871c65b | 1135 | enabler = lttng_event_enabler_create(format_type, event_param, channel); |
e58095ef MD |
1136 | if (!enabler) { |
1137 | ret = -ENOMEM; | |
f4681817 MD |
1138 | goto event_error; |
1139 | } | |
e58095ef | 1140 | objd_set_private(event_objd, enabler); |
f4681817 MD |
1141 | /* The event holds a reference on the channel */ |
1142 | objd_ref(channel_objd); | |
1143 | return event_objd; | |
1144 | ||
1145 | event_error: | |
1ea11eab MD |
1146 | { |
1147 | int err; | |
1148 | ||
1849ef7c | 1149 | err = lttng_ust_objd_unref(event_objd, 1); |
1ea11eab MD |
1150 | assert(!err); |
1151 | } | |
f4681817 MD |
1152 | objd_error: |
1153 | return ret; | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * lttng_channel_cmd - lttng control through object descriptors | |
1158 | * | |
1159 | * @objd: the object descriptor | |
1160 | * @cmd: the command | |
1161 | * @arg: command arg | |
ef9ff354 | 1162 | * @uargs: UST arguments (internal) |
f59ed768 | 1163 | * @owner: objd owner |
f4681817 MD |
1164 | * |
1165 | * This object descriptor implements lttng commands: | |
1166 | * LTTNG_UST_STREAM | |
1167 | * Returns an event stream object descriptor or failure. | |
1168 | * (typically, one event stream records events from one CPU) | |
1169 | * LTTNG_UST_EVENT | |
1170 | * Returns an event object descriptor or failure. | |
1171 | * LTTNG_UST_CONTEXT | |
1172 | * Prepend a context field to each event in the channel | |
1173 | * LTTNG_UST_ENABLE | |
1174 | * Enable recording for events in this channel (weak enable) | |
1175 | * LTTNG_UST_DISABLE | |
1176 | * Disable recording for events in this channel (strong disable) | |
1177 | * | |
1178 | * Channel and event file descriptors also hold a reference on the session. | |
1179 | */ | |
1180 | static | |
ef9ff354 | 1181 | long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1182 | union ust_args *uargs, void *owner) |
f4681817 | 1183 | { |
7dd08bec | 1184 | struct lttng_channel *channel = objd_private(objd); |
f4681817 | 1185 | |
74d81a6c MD |
1186 | if (cmd != LTTNG_UST_STREAM) { |
1187 | /* | |
1188 | * Check if channel received all streams. | |
1189 | */ | |
1190 | if (!lttng_is_channel_ready(channel)) | |
1191 | return -EPERM; | |
1192 | } | |
1193 | ||
f4681817 MD |
1194 | switch (cmd) { |
1195 | case LTTNG_UST_STREAM: | |
381c0f1e MD |
1196 | { |
1197 | struct lttng_ust_stream *stream; | |
1198 | ||
1199 | stream = (struct lttng_ust_stream *) arg; | |
1200 | /* stream used as output */ | |
74d81a6c | 1201 | return lttng_abi_map_stream(objd, stream, uargs, owner); |
381c0f1e | 1202 | } |
f4681817 | 1203 | case LTTNG_UST_EVENT: |
1f18504e MD |
1204 | { |
1205 | struct lttng_ust_event *event_param = | |
1206 | (struct lttng_ust_event *) arg; | |
196ec2df PP |
1207 | |
1208 | if (strutils_is_star_glob_pattern(event_param->name)) { | |
1209 | /* | |
1210 | * If the event name is a star globbing pattern, | |
1211 | * we create the special star globbing enabler. | |
1212 | */ | |
d871c65b | 1213 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1214 | owner, LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f18504e | 1215 | } else { |
d871c65b | 1216 | return lttng_abi_create_event_enabler(objd, event_param, |
e450e339 | 1217 | owner, LTTNG_ENABLER_FORMAT_EVENT); |
1f18504e MD |
1218 | } |
1219 | } | |
f4681817 MD |
1220 | case LTTNG_UST_CONTEXT: |
1221 | return lttng_abi_add_context(objd, | |
8e696cfa | 1222 | (struct lttng_ust_context *) arg, uargs, |
f4681817 MD |
1223 | &channel->ctx, channel->session); |
1224 | case LTTNG_UST_ENABLE: | |
7dd08bec | 1225 | return lttng_channel_enable(channel); |
f4681817 | 1226 | case LTTNG_UST_DISABLE: |
7dd08bec | 1227 | return lttng_channel_disable(channel); |
43d330a4 MD |
1228 | case LTTNG_UST_FLUSH_BUFFER: |
1229 | return channel->ops->flush_buffer(channel->chan, channel->handle); | |
f4681817 MD |
1230 | default: |
1231 | return -EINVAL; | |
1232 | } | |
1233 | } | |
1234 | ||
f4681817 MD |
1235 | static |
1236 | int lttng_channel_release(int objd) | |
1237 | { | |
7dd08bec | 1238 | struct lttng_channel *channel = objd_private(objd); |
f4681817 MD |
1239 | |
1240 | if (channel) | |
1849ef7c | 1241 | return lttng_ust_objd_unref(channel->session->objd, 0); |
f4681817 MD |
1242 | return 0; |
1243 | } | |
1244 | ||
b61ce3b2 | 1245 | static const struct lttng_ust_objd_ops lttng_channel_ops = { |
f4681817 | 1246 | .release = lttng_channel_release, |
f4681817 MD |
1247 | .cmd = lttng_channel_cmd, |
1248 | }; | |
1249 | ||
f4681817 | 1250 | /** |
e58095ef | 1251 | * lttng_enabler_cmd - lttng control through object descriptors |
e6c12e3d MD |
1252 | * |
1253 | * @objd: the object descriptor | |
1254 | * @cmd: the command | |
1255 | * @arg: command arg | |
ef9ff354 | 1256 | * @uargs: UST arguments (internal) |
f59ed768 | 1257 | * @owner: objd owner |
e6c12e3d MD |
1258 | * |
1259 | * This object descriptor implements lttng commands: | |
1260 | * LTTNG_UST_CONTEXT | |
1261 | * Prepend a context field to each record of events of this | |
e58095ef | 1262 | * enabler. |
e6c12e3d | 1263 | * LTTNG_UST_ENABLE |
e58095ef | 1264 | * Enable recording for this enabler |
e6c12e3d | 1265 | * LTTNG_UST_DISABLE |
e58095ef | 1266 | * Disable recording for this enabler |
2d78951a | 1267 | * LTTNG_UST_FILTER |
e58095ef | 1268 | * Attach a filter to an enabler. |
0bfb5cbd JI |
1269 | * LTTNG_UST_EXCLUSION |
1270 | * Attach exclusions to an enabler. | |
e6c12e3d MD |
1271 | */ |
1272 | static | |
d871c65b | 1273 | long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg, |
f59ed768 | 1274 | union ust_args *uargs, void *owner) |
e6c12e3d | 1275 | { |
d871c65b | 1276 | struct lttng_event_enabler *enabler = objd_private(objd); |
e6c12e3d MD |
1277 | |
1278 | switch (cmd) { | |
1279 | case LTTNG_UST_CONTEXT: | |
d871c65b | 1280 | return lttng_event_enabler_attach_context(enabler, |
e58095ef | 1281 | (struct lttng_ust_context *) arg); |
e6c12e3d | 1282 | case LTTNG_UST_ENABLE: |
d871c65b | 1283 | return lttng_event_enabler_enable(enabler); |
e6c12e3d | 1284 | case LTTNG_UST_DISABLE: |
d871c65b | 1285 | return lttng_event_enabler_disable(enabler); |
2d78951a MD |
1286 | case LTTNG_UST_FILTER: |
1287 | { | |
1288 | int ret; | |
1289 | ||
a56fd376 | 1290 | ret = lttng_event_enabler_attach_filter_bytecode(enabler, |
ab89263e | 1291 | (struct lttng_ust_bytecode_node **) arg); |
2d78951a MD |
1292 | if (ret) |
1293 | return ret; | |
2d78951a MD |
1294 | return 0; |
1295 | } | |
0bfb5cbd JI |
1296 | case LTTNG_UST_EXCLUSION: |
1297 | { | |
d871c65b | 1298 | return lttng_event_enabler_attach_exclusion(enabler, |
e9fe6aad | 1299 | (struct lttng_ust_excluder_node **) arg); |
0bfb5cbd | 1300 | } |
e6c12e3d MD |
1301 | default: |
1302 | return -EINVAL; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | static | |
d871c65b | 1307 | int lttng_event_enabler_release(int objd) |
e6c12e3d | 1308 | { |
d871c65b FD |
1309 | struct lttng_event_enabler *event_enabler = objd_private(objd); |
1310 | ||
1311 | if (event_enabler) | |
1312 | return lttng_ust_objd_unref(event_enabler->chan->objd, 0); | |
e6c12e3d | 1313 | |
e6c12e3d MD |
1314 | return 0; |
1315 | } | |
1316 | ||
d871c65b FD |
1317 | static const struct lttng_ust_objd_ops lttng_event_enabler_ops = { |
1318 | .release = lttng_event_enabler_release, | |
1319 | .cmd = lttng_event_enabler_cmd, | |
e6c12e3d MD |
1320 | }; |
1321 | ||
b35d179d | 1322 | void lttng_ust_abi_exit(void) |
f4681817 | 1323 | { |
45e9e699 | 1324 | lttng_ust_abi_close_in_progress = 1; |
701a658f | 1325 | ust_lock_nocheck(); |
f4681817 | 1326 | objd_table_destroy(); |
701a658f | 1327 | ust_unlock(); |
45e9e699 | 1328 | lttng_ust_abi_close_in_progress = 0; |
f4681817 | 1329 | } |