Commit | Line | Data |
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d0b96690 DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
890d8fe4 | 17 | |
6c1c0768 | 18 | #define _LGPL_SOURCE |
d0b96690 | 19 | #include <assert.h> |
7972aab2 | 20 | #include <inttypes.h> |
d0b96690 DG |
21 | |
22 | #include <common/common.h> | |
7972aab2 DG |
23 | #include <common/hashtable/utils.h> |
24 | #include <lttng/lttng.h> | |
25 | ||
d0b96690 | 26 | #include "ust-registry.h" |
8494bda5 | 27 | #include "ust-app.h" |
98b73e88 | 28 | #include "ust-field-utils.h" |
0b2dc8df | 29 | #include "utils.h" |
e9404c27 JG |
30 | #include "lttng-sessiond.h" |
31 | #include "notification-thread-commands.h" | |
d0b96690 | 32 | |
98b73e88 | 33 | |
d0b96690 DG |
34 | /* |
35 | * Hash table match function for event in the registry. | |
36 | */ | |
37 | static int ht_match_event(struct cds_lfht_node *node, const void *_key) | |
38 | { | |
d0b96690 | 39 | const struct ust_registry_event *key; |
98b73e88 FD |
40 | struct ust_registry_event *event; |
41 | int i; | |
d0b96690 DG |
42 | |
43 | assert(node); | |
44 | assert(_key); | |
45 | ||
46 | event = caa_container_of(node, struct ust_registry_event, node.node); | |
47 | assert(event); | |
48 | key = _key; | |
49 | ||
98b73e88 | 50 | /* It has to be a perfect match. First, compare the event names. */ |
b4d096a6 | 51 | if (strncmp(event->name, key->name, sizeof(event->name))) { |
d0b96690 DG |
52 | goto no_match; |
53 | } | |
54 | ||
98b73e88 FD |
55 | /* Compare log levels. */ |
56 | if (event->loglevel_value != key->loglevel_value) { | |
57 | goto no_match; | |
58 | } | |
59 | ||
60 | /* Compare the number of fields. */ | |
61 | if (event->nr_fields != key->nr_fields) { | |
62 | goto no_match; | |
63 | } | |
64 | ||
65 | /* Compare each field individually. */ | |
66 | for (i = 0; i < event->nr_fields; i++) { | |
67 | if (!match_ustctl_field(&event->fields[i], &key->fields[i])) { | |
68 | goto no_match; | |
69 | } | |
70 | } | |
71 | ||
72 | /* Compare model URI. */ | |
73 | if (event->model_emf_uri != NULL && key->model_emf_uri == NULL) { | |
74 | goto no_match; | |
75 | } else if(event->model_emf_uri == NULL && key->model_emf_uri != NULL) { | |
d0b96690 | 76 | goto no_match; |
98b73e88 FD |
77 | } else if (event->model_emf_uri != NULL && key->model_emf_uri != NULL) { |
78 | if (strcmp(event->model_emf_uri, key->model_emf_uri)) { | |
79 | goto no_match; | |
80 | } | |
d0b96690 DG |
81 | } |
82 | ||
83 | /* Match */ | |
84 | return 1; | |
85 | ||
86 | no_match: | |
87 | return 0; | |
88 | } | |
89 | ||
bcd52dd9 | 90 | static unsigned long ht_hash_event(const void *_key, unsigned long seed) |
7972aab2 | 91 | { |
98b73e88 | 92 | uint64_t hashed_key; |
bcd52dd9 | 93 | const struct ust_registry_event *key = _key; |
7972aab2 DG |
94 | |
95 | assert(key); | |
96 | ||
98b73e88 | 97 | hashed_key = (uint64_t) hash_key_str(key->name, seed); |
7972aab2 | 98 | |
98b73e88 | 99 | return hash_key_u64(&hashed_key, seed); |
7972aab2 DG |
100 | } |
101 | ||
10b56aef MD |
102 | static int compare_enums(const struct ust_registry_enum *reg_enum_a, |
103 | const struct ust_registry_enum *reg_enum_b) | |
104 | { | |
105 | int ret = 0; | |
106 | size_t i; | |
107 | ||
108 | assert(strcmp(reg_enum_a->name, reg_enum_b->name) == 0); | |
109 | if (reg_enum_a->nr_entries != reg_enum_b->nr_entries) { | |
110 | ret = -1; | |
111 | goto end; | |
112 | } | |
113 | for (i = 0; i < reg_enum_a->nr_entries; i++) { | |
114 | const struct ustctl_enum_entry *entries_a, *entries_b; | |
115 | ||
116 | entries_a = ®_enum_a->entries[i]; | |
117 | entries_b = ®_enum_b->entries[i]; | |
3b016e58 | 118 | if (entries_a->start.value != entries_b->start.value) { |
10b56aef MD |
119 | ret = -1; |
120 | goto end; | |
121 | } | |
3b016e58 | 122 | if (entries_a->end.value != entries_b->end.value) { |
10b56aef MD |
123 | ret = -1; |
124 | goto end; | |
125 | } | |
3b016e58 MD |
126 | if (entries_a->start.signedness != entries_b->start.signedness) { |
127 | ret = -1; | |
128 | goto end; | |
129 | } | |
130 | if (entries_a->end.signedness != entries_b->end.signedness) { | |
131 | ret = -1; | |
132 | goto end; | |
133 | } | |
134 | ||
10b56aef MD |
135 | if (strcmp(entries_a->string, entries_b->string)) { |
136 | ret = -1; | |
137 | goto end; | |
138 | } | |
139 | } | |
140 | end: | |
141 | return ret; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Hash table match function for enumerations in the session. Match is | |
146 | * performed on enumeration name, and confirmed by comparing the enum | |
147 | * entries. | |
148 | */ | |
149 | static int ht_match_enum(struct cds_lfht_node *node, const void *_key) | |
150 | { | |
151 | struct ust_registry_enum *_enum; | |
152 | const struct ust_registry_enum *key; | |
153 | ||
154 | assert(node); | |
155 | assert(_key); | |
156 | ||
157 | _enum = caa_container_of(node, struct ust_registry_enum, | |
158 | node.node); | |
159 | assert(_enum); | |
160 | key = _key; | |
161 | ||
162 | if (strncmp(_enum->name, key->name, LTTNG_UST_SYM_NAME_LEN)) { | |
163 | goto no_match; | |
164 | } | |
165 | if (compare_enums(_enum, key)) { | |
166 | goto no_match; | |
167 | } | |
168 | ||
169 | /* Match. */ | |
170 | return 1; | |
171 | ||
172 | no_match: | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Hash table match function for enumerations in the session. Match is | |
178 | * performed by enumeration ID. | |
179 | */ | |
180 | static int ht_match_enum_id(struct cds_lfht_node *node, const void *_key) | |
181 | { | |
182 | struct ust_registry_enum *_enum; | |
183 | const struct ust_registry_enum *key = _key; | |
184 | ||
185 | assert(node); | |
186 | assert(_key); | |
187 | ||
188 | _enum = caa_container_of(node, struct ust_registry_enum, node.node); | |
189 | assert(_enum); | |
190 | ||
191 | if (_enum->id != key->id) { | |
192 | goto no_match; | |
193 | } | |
194 | ||
195 | /* Match. */ | |
196 | return 1; | |
197 | ||
198 | no_match: | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Hash table hash function for enumerations in the session. The | |
204 | * enumeration name is used for hashing. | |
205 | */ | |
206 | static unsigned long ht_hash_enum(void *_key, unsigned long seed) | |
207 | { | |
208 | struct ust_registry_enum *key = _key; | |
209 | ||
210 | assert(key); | |
211 | return hash_key_str(key->name, seed); | |
212 | } | |
213 | ||
8494bda5 MD |
214 | /* |
215 | * Return negative value on error, 0 if OK. | |
216 | * | |
217 | * TODO: we could add stricter verification of more types to catch | |
218 | * errors in liblttng-ust implementation earlier than consumption by the | |
219 | * trace reader. | |
220 | */ | |
221 | static | |
222 | int validate_event_field(struct ustctl_field *field, | |
223 | const char *event_name, | |
224 | struct ust_app *app) | |
225 | { | |
da860cab MD |
226 | int ret = 0; |
227 | ||
8494bda5 MD |
228 | switch(field->type.atype) { |
229 | case ustctl_atype_integer: | |
230 | case ustctl_atype_enum: | |
231 | case ustctl_atype_array: | |
232 | case ustctl_atype_sequence: | |
233 | case ustctl_atype_string: | |
da860cab MD |
234 | case ustctl_atype_variant: |
235 | break; | |
236 | case ustctl_atype_struct: | |
237 | if (field->type.u._struct.nr_fields != 0) { | |
238 | WARN("Unsupported non-empty struct field."); | |
239 | ret = -EINVAL; | |
240 | goto end; | |
241 | } | |
8494bda5 MD |
242 | break; |
243 | ||
244 | case ustctl_atype_float: | |
245 | switch (field->type.u.basic._float.mant_dig) { | |
246 | case 0: | |
247 | WARN("UST application '%s' (pid: %d) has unknown float mantissa '%u' " | |
248 | "in field '%s', rejecting event '%s'", | |
249 | app->name, app->pid, | |
250 | field->type.u.basic._float.mant_dig, | |
251 | field->name, | |
252 | event_name); | |
da860cab MD |
253 | ret = -EINVAL; |
254 | goto end; | |
8494bda5 MD |
255 | default: |
256 | break; | |
257 | } | |
258 | break; | |
259 | ||
260 | default: | |
da860cab MD |
261 | ret = -ENOENT; |
262 | goto end; | |
8494bda5 | 263 | } |
da860cab MD |
264 | end: |
265 | return ret; | |
8494bda5 MD |
266 | } |
267 | ||
268 | static | |
269 | int validate_event_fields(size_t nr_fields, struct ustctl_field *fields, | |
270 | const char *event_name, struct ust_app *app) | |
271 | { | |
272 | unsigned int i; | |
273 | ||
274 | for (i = 0; i < nr_fields; i++) { | |
275 | if (validate_event_field(&fields[i], event_name, app) < 0) | |
276 | return -EINVAL; | |
277 | } | |
278 | return 0; | |
279 | } | |
280 | ||
d0b96690 DG |
281 | /* |
282 | * Allocate event and initialize it. This does NOT set a valid event id from a | |
283 | * registry. | |
284 | */ | |
285 | static struct ust_registry_event *alloc_event(int session_objd, | |
286 | int channel_objd, char *name, char *sig, size_t nr_fields, | |
2106efa0 PP |
287 | struct ustctl_field *fields, int loglevel_value, |
288 | char *model_emf_uri, struct ust_app *app) | |
d0b96690 DG |
289 | { |
290 | struct ust_registry_event *event = NULL; | |
291 | ||
8494bda5 MD |
292 | /* |
293 | * Ensure that the field content is valid. | |
294 | */ | |
295 | if (validate_event_fields(nr_fields, fields, name, app) < 0) { | |
296 | return NULL; | |
297 | } | |
298 | ||
d0b96690 DG |
299 | event = zmalloc(sizeof(*event)); |
300 | if (!event) { | |
301 | PERROR("zmalloc ust registry event"); | |
302 | goto error; | |
303 | } | |
304 | ||
305 | event->session_objd = session_objd; | |
306 | event->channel_objd = channel_objd; | |
307 | /* Allocated by ustctl. */ | |
308 | event->signature = sig; | |
309 | event->nr_fields = nr_fields; | |
310 | event->fields = fields; | |
2106efa0 | 311 | event->loglevel_value = loglevel_value; |
d0b96690 DG |
312 | event->model_emf_uri = model_emf_uri; |
313 | if (name) { | |
314 | /* Copy event name and force NULL byte. */ | |
315 | strncpy(event->name, name, sizeof(event->name)); | |
316 | event->name[sizeof(event->name) - 1] = '\0'; | |
317 | } | |
7972aab2 | 318 | cds_lfht_node_init(&event->node.node); |
d0b96690 DG |
319 | |
320 | error: | |
321 | return event; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Free event data structure. This does NOT delete it from any hash table. It's | |
326 | * safe to pass a NULL pointer. This shoudl be called inside a call RCU if the | |
327 | * event is previously deleted from a rcu hash table. | |
328 | */ | |
329 | static void destroy_event(struct ust_registry_event *event) | |
330 | { | |
331 | if (!event) { | |
332 | return; | |
333 | } | |
334 | ||
335 | free(event->fields); | |
336 | free(event->model_emf_uri); | |
337 | free(event->signature); | |
338 | free(event); | |
339 | } | |
340 | ||
341 | /* | |
342 | * Destroy event function call of the call RCU. | |
343 | */ | |
344 | static void destroy_event_rcu(struct rcu_head *head) | |
345 | { | |
7972aab2 DG |
346 | struct lttng_ht_node_u64 *node = |
347 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
d0b96690 DG |
348 | struct ust_registry_event *event = |
349 | caa_container_of(node, struct ust_registry_event, node); | |
350 | ||
351 | destroy_event(event); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Find an event using the name and signature in the given registry. RCU read | |
356 | * side lock MUST be acquired before calling this function and as long as the | |
357 | * event reference is kept by the caller. | |
358 | * | |
359 | * On success, the event pointer is returned else NULL. | |
360 | */ | |
361 | struct ust_registry_event *ust_registry_find_event( | |
362 | struct ust_registry_channel *chan, char *name, char *sig) | |
363 | { | |
7972aab2 | 364 | struct lttng_ht_node_u64 *node; |
d0b96690 DG |
365 | struct lttng_ht_iter iter; |
366 | struct ust_registry_event *event = NULL; | |
367 | struct ust_registry_event key; | |
368 | ||
369 | assert(chan); | |
370 | assert(name); | |
371 | assert(sig); | |
372 | ||
373 | /* Setup key for the match function. */ | |
374 | strncpy(key.name, name, sizeof(key.name)); | |
375 | key.name[sizeof(key.name) - 1] = '\0'; | |
376 | key.signature = sig; | |
377 | ||
7972aab2 | 378 | cds_lfht_lookup(chan->ht->ht, chan->ht->hash_fct(&key, lttng_ht_seed), |
d0b96690 | 379 | chan->ht->match_fct, &key, &iter.iter); |
7972aab2 | 380 | node = lttng_ht_iter_get_node_u64(&iter); |
d0b96690 DG |
381 | if (!node) { |
382 | goto end; | |
383 | } | |
384 | event = caa_container_of(node, struct ust_registry_event, node); | |
385 | ||
386 | end: | |
387 | return event; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Create a ust_registry_event from the given parameters and add it to the | |
392 | * registry hash table. If event_id is valid, it is set with the newly created | |
393 | * event id. | |
394 | * | |
395 | * On success, return 0 else a negative value. The created event MUST be unique | |
396 | * so on duplicate entry -EINVAL is returned. On error, event_id is untouched. | |
397 | * | |
398 | * Should be called with session registry mutex held. | |
399 | */ | |
400 | int ust_registry_create_event(struct ust_registry_session *session, | |
45893984 | 401 | uint64_t chan_key, int session_objd, int channel_objd, char *name, |
2106efa0 PP |
402 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
403 | int loglevel_value, char *model_emf_uri, int buffer_type, | |
404 | uint32_t *event_id_p, struct ust_app *app) | |
d0b96690 DG |
405 | { |
406 | int ret; | |
7972aab2 | 407 | uint32_t event_id; |
d0b96690 DG |
408 | struct cds_lfht_node *nptr; |
409 | struct ust_registry_event *event = NULL; | |
45893984 | 410 | struct ust_registry_channel *chan; |
d0b96690 DG |
411 | |
412 | assert(session); | |
d0b96690 DG |
413 | assert(name); |
414 | assert(sig); | |
7972aab2 | 415 | assert(event_id_p); |
d0b96690 | 416 | |
d5d629b5 DG |
417 | rcu_read_lock(); |
418 | ||
d0b96690 DG |
419 | /* |
420 | * This should not happen but since it comes from the UST tracer, an | |
421 | * external party, don't assert and simply validate values. | |
422 | */ | |
423 | if (session_objd < 0 || channel_objd < 0) { | |
424 | ret = -EINVAL; | |
d5d629b5 | 425 | goto error_free; |
d0b96690 DG |
426 | } |
427 | ||
45893984 DG |
428 | chan = ust_registry_channel_find(session, chan_key); |
429 | if (!chan) { | |
430 | ret = -EINVAL; | |
d5d629b5 | 431 | goto error_free; |
45893984 DG |
432 | } |
433 | ||
d0b96690 DG |
434 | /* Check if we've reached the maximum possible id. */ |
435 | if (ust_registry_is_max_id(chan->used_event_id)) { | |
436 | ret = -ENOENT; | |
d5d629b5 | 437 | goto error_free; |
d0b96690 DG |
438 | } |
439 | ||
440 | event = alloc_event(session_objd, channel_objd, name, sig, nr_fields, | |
2106efa0 | 441 | fields, loglevel_value, model_emf_uri, app); |
d0b96690 DG |
442 | if (!event) { |
443 | ret = -ENOMEM; | |
d5d629b5 | 444 | goto error_free; |
d0b96690 DG |
445 | } |
446 | ||
d0b96690 | 447 | DBG3("UST registry creating event with event: %s, sig: %s, id: %u, " |
7972aab2 DG |
448 | "chan_objd: %u, sess_objd: %u, chan_id: %u", event->name, |
449 | event->signature, event->id, event->channel_objd, | |
450 | event->session_objd, chan->chan_id); | |
d0b96690 | 451 | |
d0b96690 DG |
452 | /* |
453 | * This is an add unique with a custom match function for event. The node | |
454 | * are matched using the event name and signature. | |
455 | */ | |
7972aab2 | 456 | nptr = cds_lfht_add_unique(chan->ht->ht, chan->ht->hash_fct(event, |
d0b96690 DG |
457 | lttng_ht_seed), chan->ht->match_fct, event, &event->node.node); |
458 | if (nptr != &event->node.node) { | |
7972aab2 DG |
459 | if (buffer_type == LTTNG_BUFFER_PER_UID) { |
460 | /* | |
461 | * This is normal, we just have to send the event id of the | |
462 | * returned node and make sure we destroy the previously allocated | |
463 | * event object. | |
464 | */ | |
465 | destroy_event(event); | |
466 | event = caa_container_of(nptr, struct ust_registry_event, | |
467 | node.node); | |
468 | assert(event); | |
469 | event_id = event->id; | |
470 | } else { | |
471 | ERR("UST registry create event add unique failed for event: %s, " | |
472 | "sig: %s, id: %u, chan_objd: %u, sess_objd: %u", | |
473 | event->name, event->signature, event->id, | |
474 | event->channel_objd, event->session_objd); | |
475 | ret = -EINVAL; | |
476 | goto error_unlock; | |
477 | } | |
478 | } else { | |
479 | /* Request next event id if the node was successfully added. */ | |
480 | event_id = event->id = ust_registry_get_next_event_id(chan); | |
d0b96690 DG |
481 | } |
482 | ||
7972aab2 | 483 | *event_id_p = event_id; |
d0b96690 | 484 | |
7972aab2 DG |
485 | if (!event->metadata_dumped) { |
486 | /* Append to metadata */ | |
487 | ret = ust_metadata_event_statedump(session, chan, event); | |
488 | if (ret) { | |
489 | ERR("Error appending event metadata (errno = %d)", ret); | |
490 | rcu_read_unlock(); | |
491 | return ret; | |
492 | } | |
d0b96690 DG |
493 | } |
494 | ||
45893984 | 495 | rcu_read_unlock(); |
d0b96690 DG |
496 | return 0; |
497 | ||
d5d629b5 DG |
498 | error_free: |
499 | free(sig); | |
500 | free(fields); | |
501 | free(model_emf_uri); | |
d0b96690 DG |
502 | error_unlock: |
503 | rcu_read_unlock(); | |
d0b96690 DG |
504 | destroy_event(event); |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* | |
509 | * For a given event in a registry, delete the entry and destroy the event. | |
510 | * This MUST be called within a RCU read side lock section. | |
511 | */ | |
512 | void ust_registry_destroy_event(struct ust_registry_channel *chan, | |
513 | struct ust_registry_event *event) | |
514 | { | |
515 | int ret; | |
516 | struct lttng_ht_iter iter; | |
517 | ||
518 | assert(chan); | |
519 | assert(event); | |
520 | ||
521 | /* Delete the node first. */ | |
522 | iter.iter.node = &event->node.node; | |
523 | ret = lttng_ht_del(chan->ht, &iter); | |
524 | assert(!ret); | |
525 | ||
526 | call_rcu(&event->node.head, destroy_event_rcu); | |
527 | ||
528 | return; | |
529 | } | |
530 | ||
10b56aef MD |
531 | static void destroy_enum(struct ust_registry_enum *reg_enum) |
532 | { | |
533 | if (!reg_enum) { | |
534 | return; | |
535 | } | |
536 | free(reg_enum->entries); | |
537 | free(reg_enum); | |
538 | } | |
539 | ||
540 | static void destroy_enum_rcu(struct rcu_head *head) | |
541 | { | |
542 | struct ust_registry_enum *reg_enum = | |
543 | caa_container_of(head, struct ust_registry_enum, rcu_head); | |
544 | ||
545 | destroy_enum(reg_enum); | |
546 | } | |
547 | ||
548 | /* | |
549 | * Lookup enumeration by name and comparing enumeration entries. | |
550 | * Needs to be called from RCU read-side critical section. | |
551 | */ | |
10dc2d10 SM |
552 | static struct ust_registry_enum *ust_registry_lookup_enum( |
553 | struct ust_registry_session *session, | |
10b56aef MD |
554 | const struct ust_registry_enum *reg_enum_lookup) |
555 | { | |
556 | struct ust_registry_enum *reg_enum = NULL; | |
557 | struct lttng_ht_node_str *node; | |
558 | struct lttng_ht_iter iter; | |
559 | ||
560 | cds_lfht_lookup(session->enums->ht, | |
a752d6fa FD |
561 | ht_hash_enum((void *) reg_enum_lookup, lttng_ht_seed), |
562 | ht_match_enum, reg_enum_lookup, &iter.iter); | |
10b56aef MD |
563 | node = lttng_ht_iter_get_node_str(&iter); |
564 | if (!node) { | |
565 | goto end; | |
566 | } | |
567 | reg_enum = caa_container_of(node, struct ust_registry_enum, node); | |
568 | end: | |
569 | return reg_enum; | |
570 | } | |
571 | ||
572 | /* | |
573 | * Lookup enumeration by enum ID. | |
574 | * Needs to be called from RCU read-side critical section. | |
575 | */ | |
576 | struct ust_registry_enum * | |
577 | ust_registry_lookup_enum_by_id(struct ust_registry_session *session, | |
578 | const char *enum_name, uint64_t enum_id) | |
579 | { | |
580 | struct ust_registry_enum *reg_enum = NULL; | |
581 | struct lttng_ht_node_str *node; | |
582 | struct lttng_ht_iter iter; | |
583 | struct ust_registry_enum reg_enum_lookup; | |
584 | ||
585 | memset(®_enum_lookup, 0, sizeof(reg_enum_lookup)); | |
586 | strncpy(reg_enum_lookup.name, enum_name, LTTNG_UST_SYM_NAME_LEN); | |
587 | reg_enum_lookup.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
588 | reg_enum_lookup.id = enum_id; | |
589 | cds_lfht_lookup(session->enums->ht, | |
590 | ht_hash_enum((void *) ®_enum_lookup, lttng_ht_seed), | |
591 | ht_match_enum_id, ®_enum_lookup, &iter.iter); | |
592 | node = lttng_ht_iter_get_node_str(&iter); | |
593 | if (!node) { | |
594 | goto end; | |
595 | } | |
596 | reg_enum = caa_container_of(node, struct ust_registry_enum, node); | |
597 | end: | |
598 | return reg_enum; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Create a ust_registry_enum from the given parameters and add it to the | |
603 | * registry hash table, or find it if already there. | |
604 | * | |
605 | * On success, return 0 else a negative value. | |
606 | * | |
607 | * Should be called with session registry mutex held. | |
608 | * | |
609 | * We receive ownership of entries. | |
610 | */ | |
611 | int ust_registry_create_or_find_enum(struct ust_registry_session *session, | |
612 | int session_objd, char *enum_name, | |
613 | struct ustctl_enum_entry *entries, size_t nr_entries, | |
614 | uint64_t *enum_id) | |
615 | { | |
616 | int ret = 0; | |
617 | struct cds_lfht_node *nodep; | |
618 | struct ust_registry_enum *reg_enum = NULL, *old_reg_enum; | |
619 | ||
620 | assert(session); | |
621 | assert(enum_name); | |
622 | ||
623 | rcu_read_lock(); | |
624 | ||
625 | /* | |
626 | * This should not happen but since it comes from the UST tracer, an | |
627 | * external party, don't assert and simply validate values. | |
628 | */ | |
629 | if (session_objd < 0) { | |
630 | ret = -EINVAL; | |
631 | goto end; | |
632 | } | |
633 | ||
634 | /* Check if the enumeration was already dumped */ | |
635 | reg_enum = zmalloc(sizeof(*reg_enum)); | |
636 | if (!reg_enum) { | |
637 | PERROR("zmalloc ust registry enumeration"); | |
638 | ret = -ENOMEM; | |
639 | goto end; | |
640 | } | |
641 | strncpy(reg_enum->name, enum_name, LTTNG_UST_SYM_NAME_LEN); | |
642 | reg_enum->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
643 | /* entries will be owned by reg_enum. */ | |
644 | reg_enum->entries = entries; | |
645 | reg_enum->nr_entries = nr_entries; | |
646 | entries = NULL; | |
647 | ||
648 | old_reg_enum = ust_registry_lookup_enum(session, reg_enum); | |
649 | if (old_reg_enum) { | |
650 | DBG("enum %s already in sess_objd: %u", enum_name, session_objd); | |
651 | /* Fall through. Use prior enum. */ | |
652 | destroy_enum(reg_enum); | |
653 | reg_enum = old_reg_enum; | |
654 | } else { | |
655 | DBG("UST registry creating enum: %s, sess_objd: %u", | |
656 | enum_name, session_objd); | |
657 | if (session->next_enum_id == -1ULL) { | |
658 | ret = -EOVERFLOW; | |
659 | destroy_enum(reg_enum); | |
660 | goto end; | |
661 | } | |
662 | reg_enum->id = session->next_enum_id++; | |
663 | cds_lfht_node_init(®_enum->node.node); | |
664 | nodep = cds_lfht_add_unique(session->enums->ht, | |
665 | ht_hash_enum(reg_enum, lttng_ht_seed), | |
666 | ht_match_enum_id, reg_enum, | |
667 | ®_enum->node.node); | |
668 | assert(nodep == ®_enum->node.node); | |
669 | } | |
670 | DBG("UST registry reply with enum %s with id %" PRIu64 " in sess_objd: %u", | |
671 | enum_name, reg_enum->id, session_objd); | |
672 | *enum_id = reg_enum->id; | |
673 | end: | |
674 | free(entries); | |
675 | rcu_read_unlock(); | |
676 | return ret; | |
677 | } | |
678 | ||
679 | /* | |
680 | * For a given enumeration in a registry, delete the entry and destroy | |
681 | * the enumeration. | |
682 | * This MUST be called within a RCU read side lock section. | |
683 | */ | |
10dc2d10 | 684 | static void ust_registry_destroy_enum(struct ust_registry_session *reg_session, |
10b56aef MD |
685 | struct ust_registry_enum *reg_enum) |
686 | { | |
687 | int ret; | |
688 | struct lttng_ht_iter iter; | |
689 | ||
690 | assert(reg_session); | |
691 | assert(reg_enum); | |
692 | ||
693 | /* Delete the node first. */ | |
694 | iter.iter.node = ®_enum->node.node; | |
695 | ret = lttng_ht_del(reg_session->enums, &iter); | |
696 | assert(!ret); | |
697 | call_rcu(®_enum->rcu_head, destroy_enum_rcu); | |
698 | } | |
699 | ||
36b588ed MD |
700 | /* |
701 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
702 | * section and outside of call_rcu thread, so we postpone its execution |
703 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
704 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
705 | */ |
706 | static | |
707 | void destroy_channel_rcu(struct rcu_head *head) | |
708 | { | |
709 | struct ust_registry_channel *chan = | |
710 | caa_container_of(head, struct ust_registry_channel, rcu_head); | |
711 | ||
9dbcf332 | 712 | if (chan->ht) { |
0b2dc8df | 713 | ht_cleanup_push(chan->ht); |
9dbcf332 | 714 | } |
3295105b | 715 | free(chan->ctx_fields); |
36b588ed MD |
716 | free(chan); |
717 | } | |
718 | ||
d0b96690 DG |
719 | /* |
720 | * Destroy every element of the registry and free the memory. This does NOT | |
721 | * free the registry pointer since it might not have been allocated before so | |
722 | * it's the caller responsability. | |
d0b96690 | 723 | */ |
e9404c27 | 724 | static void destroy_channel(struct ust_registry_channel *chan, bool notif) |
d0b96690 DG |
725 | { |
726 | struct lttng_ht_iter iter; | |
727 | struct ust_registry_event *event; | |
e9404c27 | 728 | enum lttng_error_code cmd_ret; |
d0b96690 DG |
729 | |
730 | assert(chan); | |
731 | ||
e9404c27 JG |
732 | if (notif) { |
733 | cmd_ret = notification_thread_command_remove_channel( | |
734 | notification_thread_handle, chan->consumer_key, | |
735 | LTTNG_DOMAIN_UST); | |
736 | if (cmd_ret != LTTNG_OK) { | |
737 | ERR("Failed to remove channel from notification thread"); | |
738 | } | |
739 | } | |
740 | ||
9209cee7 | 741 | rcu_read_lock(); |
d0b96690 DG |
742 | /* Destroy all event associated with this registry. */ |
743 | cds_lfht_for_each_entry(chan->ht->ht, &iter.iter, event, node.node) { | |
744 | /* Delete the node from the ht and free it. */ | |
745 | ust_registry_destroy_event(chan, event); | |
746 | } | |
9209cee7 | 747 | rcu_read_unlock(); |
36b588ed | 748 | call_rcu(&chan->rcu_head, destroy_channel_rcu); |
d0b96690 DG |
749 | } |
750 | ||
751 | /* | |
752 | * Initialize registry with default values. | |
753 | */ | |
45893984 DG |
754 | int ust_registry_channel_add(struct ust_registry_session *session, |
755 | uint64_t key) | |
756 | { | |
757 | int ret = 0; | |
758 | struct ust_registry_channel *chan; | |
759 | ||
760 | assert(session); | |
761 | ||
762 | chan = zmalloc(sizeof(*chan)); | |
763 | if (!chan) { | |
764 | PERROR("zmalloc ust registry channel"); | |
765 | ret = -ENOMEM; | |
9dbcf332 | 766 | goto error_alloc; |
45893984 DG |
767 | } |
768 | ||
769 | chan->ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
770 | if (!chan->ht) { | |
771 | ret = -ENOMEM; | |
772 | goto error; | |
773 | } | |
774 | ||
775 | /* Set custom match function. */ | |
776 | chan->ht->match_fct = ht_match_event; | |
7972aab2 DG |
777 | chan->ht->hash_fct = ht_hash_event; |
778 | ||
779 | /* | |
780 | * Assign a channel ID right now since the event notification comes | |
781 | * *before* the channel notify so the ID needs to be set at this point so | |
782 | * the metadata can be dumped for that event. | |
783 | */ | |
784 | if (ust_registry_is_max_id(session->used_channel_id)) { | |
785 | ret = -1; | |
786 | goto error; | |
787 | } | |
788 | chan->chan_id = ust_registry_get_next_chan_id(session); | |
45893984 DG |
789 | |
790 | rcu_read_lock(); | |
791 | lttng_ht_node_init_u64(&chan->node, key); | |
792 | lttng_ht_add_unique_u64(session->channels, &chan->node); | |
793 | rcu_read_unlock(); | |
794 | ||
9dbcf332 DG |
795 | return 0; |
796 | ||
45893984 | 797 | error: |
e9404c27 | 798 | destroy_channel(chan, false); |
9dbcf332 | 799 | error_alloc: |
45893984 DG |
800 | return ret; |
801 | } | |
802 | ||
803 | /* | |
804 | * Find a channel in the given registry. RCU read side lock MUST be acquired | |
805 | * before calling this function and as long as the event reference is kept by | |
806 | * the caller. | |
807 | * | |
808 | * On success, the pointer is returned else NULL. | |
809 | */ | |
810 | struct ust_registry_channel *ust_registry_channel_find( | |
811 | struct ust_registry_session *session, uint64_t key) | |
812 | { | |
813 | struct lttng_ht_node_u64 *node; | |
814 | struct lttng_ht_iter iter; | |
815 | struct ust_registry_channel *chan = NULL; | |
816 | ||
817 | assert(session); | |
818 | assert(session->channels); | |
819 | ||
7972aab2 DG |
820 | DBG3("UST registry channel finding key %" PRIu64, key); |
821 | ||
45893984 DG |
822 | lttng_ht_lookup(session->channels, &key, &iter); |
823 | node = lttng_ht_iter_get_node_u64(&iter); | |
824 | if (!node) { | |
825 | goto end; | |
826 | } | |
827 | chan = caa_container_of(node, struct ust_registry_channel, node); | |
828 | ||
829 | end: | |
830 | return chan; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Remove channel using key from registry and free memory. | |
835 | */ | |
836 | void ust_registry_channel_del_free(struct ust_registry_session *session, | |
e9404c27 | 837 | uint64_t key, bool notif) |
45893984 DG |
838 | { |
839 | struct lttng_ht_iter iter; | |
840 | struct ust_registry_channel *chan; | |
9209cee7 | 841 | int ret; |
45893984 DG |
842 | |
843 | assert(session); | |
844 | ||
845 | rcu_read_lock(); | |
846 | chan = ust_registry_channel_find(session, key); | |
847 | if (!chan) { | |
9209cee7 | 848 | rcu_read_unlock(); |
45893984 DG |
849 | goto end; |
850 | } | |
851 | ||
852 | iter.iter.node = &chan->node.node; | |
9209cee7 MD |
853 | ret = lttng_ht_del(session->channels, &iter); |
854 | assert(!ret); | |
855 | rcu_read_unlock(); | |
e9404c27 | 856 | destroy_channel(chan, notif); |
45893984 DG |
857 | |
858 | end: | |
45893984 DG |
859 | return; |
860 | } | |
861 | ||
862 | /* | |
863 | * Initialize registry with default values and set the newly allocated session | |
864 | * pointer to sessionp. | |
865 | * | |
866 | * Return 0 on success and sessionp is set or else return -1 and sessionp is | |
867 | * kept untouched. | |
868 | */ | |
869 | int ust_registry_session_init(struct ust_registry_session **sessionp, | |
d0b96690 DG |
870 | struct ust_app *app, |
871 | uint32_t bits_per_long, | |
872 | uint32_t uint8_t_alignment, | |
873 | uint32_t uint16_t_alignment, | |
874 | uint32_t uint32_t_alignment, | |
875 | uint32_t uint64_t_alignment, | |
876 | uint32_t long_alignment, | |
af6142cf MD |
877 | int byte_order, |
878 | uint32_t major, | |
d7ba1388 | 879 | uint32_t minor, |
3d071855 | 880 | const char *root_shm_path, |
d7ba1388 MD |
881 | const char *shm_path, |
882 | uid_t euid, | |
8de88061 JR |
883 | gid_t egid, |
884 | uint64_t tracing_id, | |
885 | uid_t tracing_uid) | |
d0b96690 DG |
886 | { |
887 | int ret; | |
45893984 | 888 | struct ust_registry_session *session; |
d0b96690 | 889 | |
45893984 | 890 | assert(sessionp); |
d0b96690 | 891 | |
45893984 DG |
892 | session = zmalloc(sizeof(*session)); |
893 | if (!session) { | |
894 | PERROR("zmalloc ust registry session"); | |
9dbcf332 | 895 | goto error_alloc; |
45893984 | 896 | } |
d0b96690 DG |
897 | |
898 | pthread_mutex_init(&session->lock, NULL); | |
899 | session->bits_per_long = bits_per_long; | |
900 | session->uint8_t_alignment = uint8_t_alignment; | |
901 | session->uint16_t_alignment = uint16_t_alignment; | |
902 | session->uint32_t_alignment = uint32_t_alignment; | |
903 | session->uint64_t_alignment = uint64_t_alignment; | |
904 | session->long_alignment = long_alignment; | |
905 | session->byte_order = byte_order; | |
d7ba1388 | 906 | session->metadata_fd = -1; |
4628484a MD |
907 | session->uid = euid; |
908 | session->gid = egid; | |
10b56aef | 909 | session->next_enum_id = 0; |
7062f070 JD |
910 | session->major = major; |
911 | session->minor = minor; | |
3d071855 MD |
912 | strncpy(session->root_shm_path, root_shm_path, |
913 | sizeof(session->root_shm_path)); | |
914 | session->root_shm_path[sizeof(session->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
915 | if (shm_path[0]) { |
916 | strncpy(session->shm_path, shm_path, | |
917 | sizeof(session->shm_path)); | |
918 | session->shm_path[sizeof(session->shm_path) - 1] = '\0'; | |
919 | strncpy(session->metadata_path, shm_path, | |
920 | sizeof(session->metadata_path)); | |
921 | session->metadata_path[sizeof(session->metadata_path) - 1] = '\0'; | |
922 | strncat(session->metadata_path, "/metadata", | |
923 | sizeof(session->metadata_path) | |
924 | - strlen(session->metadata_path) - 1); | |
925 | } | |
926 | if (session->shm_path[0]) { | |
927 | ret = run_as_mkdir_recursive(session->shm_path, | |
928 | S_IRWXU | S_IRWXG, | |
929 | euid, egid); | |
930 | if (ret) { | |
931 | PERROR("run_as_mkdir_recursive"); | |
932 | goto error; | |
933 | } | |
934 | } | |
935 | if (session->metadata_path[0]) { | |
936 | /* Create metadata file */ | |
4628484a | 937 | ret = run_as_open(session->metadata_path, |
d7ba1388 | 938 | O_WRONLY | O_CREAT | O_EXCL, |
4628484a | 939 | S_IRUSR | S_IWUSR, euid, egid); |
d7ba1388 MD |
940 | if (ret < 0) { |
941 | PERROR("Opening metadata file"); | |
942 | goto error; | |
943 | } | |
944 | session->metadata_fd = ret; | |
945 | } | |
d0b96690 | 946 | |
10b56aef MD |
947 | session->enums = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
948 | if (!session->enums) { | |
de64322e | 949 | ERR("Failed to create enums hash table"); |
10b56aef MD |
950 | goto error; |
951 | } | |
952 | /* hash/match functions are specified at call site. */ | |
953 | session->enums->match_fct = NULL; | |
954 | session->enums->hash_fct = NULL; | |
955 | ||
45893984 DG |
956 | session->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
957 | if (!session->channels) { | |
958 | goto error; | |
959 | } | |
960 | ||
d0b96690 DG |
961 | ret = lttng_uuid_generate(session->uuid); |
962 | if (ret) { | |
963 | ERR("Failed to generate UST uuid (errno = %d)", ret); | |
964 | goto error; | |
965 | } | |
966 | ||
8de88061 JR |
967 | session->tracing_id = tracing_id; |
968 | session->tracing_uid = tracing_uid; | |
969 | ||
d0b96690 | 970 | pthread_mutex_lock(&session->lock); |
af6142cf | 971 | ret = ust_metadata_session_statedump(session, app, major, minor); |
d0b96690 DG |
972 | pthread_mutex_unlock(&session->lock); |
973 | if (ret) { | |
974 | ERR("Failed to generate session metadata (errno = %d)", ret); | |
975 | goto error; | |
976 | } | |
977 | ||
45893984 DG |
978 | *sessionp = session; |
979 | ||
d0b96690 DG |
980 | return 0; |
981 | ||
982 | error: | |
9dbcf332 | 983 | ust_registry_session_destroy(session); |
d24ff3fd | 984 | free(session); |
9dbcf332 | 985 | error_alloc: |
d0b96690 DG |
986 | return -1; |
987 | } | |
988 | ||
989 | /* | |
990 | * Destroy session registry. This does NOT free the given pointer since it | |
991 | * might get passed as a reference. The registry lock should NOT be acquired. | |
992 | */ | |
993 | void ust_registry_session_destroy(struct ust_registry_session *reg) | |
994 | { | |
995 | int ret; | |
45893984 DG |
996 | struct lttng_ht_iter iter; |
997 | struct ust_registry_channel *chan; | |
10b56aef | 998 | struct ust_registry_enum *reg_enum; |
d0b96690 | 999 | |
286c991a MD |
1000 | if (!reg) { |
1001 | return; | |
1002 | } | |
9d8efb0e | 1003 | |
d0b96690 DG |
1004 | /* On error, EBUSY can be returned if lock. Code flow error. */ |
1005 | ret = pthread_mutex_destroy(®->lock); | |
1006 | assert(!ret); | |
1007 | ||
9d8efb0e DG |
1008 | if (reg->channels) { |
1009 | rcu_read_lock(); | |
1010 | /* Destroy all event associated with this registry. */ | |
1011 | cds_lfht_for_each_entry(reg->channels->ht, &iter.iter, chan, | |
1012 | node.node) { | |
1013 | /* Delete the node from the ht and free it. */ | |
1014 | ret = lttng_ht_del(reg->channels, &iter); | |
1015 | assert(!ret); | |
e9404c27 | 1016 | destroy_channel(chan, true); |
9d8efb0e DG |
1017 | } |
1018 | rcu_read_unlock(); | |
1019 | ht_cleanup_push(reg->channels); | |
45893984 | 1020 | } |
45893984 | 1021 | |
d0b96690 | 1022 | free(reg->metadata); |
d7ba1388 MD |
1023 | if (reg->metadata_fd >= 0) { |
1024 | ret = close(reg->metadata_fd); | |
1025 | if (ret) { | |
1026 | PERROR("close"); | |
1027 | } | |
4628484a MD |
1028 | ret = run_as_unlink(reg->metadata_path, |
1029 | reg->uid, reg->gid); | |
d7ba1388 MD |
1030 | if (ret) { |
1031 | PERROR("unlink"); | |
1032 | } | |
1033 | } | |
3d071855 MD |
1034 | if (reg->root_shm_path[0]) { |
1035 | /* | |
1036 | * Try deleting the directory hierarchy. | |
1037 | */ | |
602766ec | 1038 | (void) run_as_rmdir_recursive(reg->root_shm_path, |
f75c5439 MD |
1039 | reg->uid, reg->gid, |
1040 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
3d071855 | 1041 | } |
10b56aef MD |
1042 | /* Destroy the enum hash table */ |
1043 | if (reg->enums) { | |
1044 | rcu_read_lock(); | |
1045 | /* Destroy all enum entries associated with this registry. */ | |
1046 | cds_lfht_for_each_entry(reg->enums->ht, &iter.iter, reg_enum, | |
1047 | node.node) { | |
1048 | ust_registry_destroy_enum(reg, reg_enum); | |
1049 | } | |
1050 | rcu_read_unlock(); | |
1051 | ht_cleanup_push(reg->enums); | |
1052 | } | |
d0b96690 | 1053 | } |