Commit | Line | Data |
---|---|---|
20fe2104 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
20fe2104 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
20fe2104 | 5 | * |
20fe2104 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
28ab034a JG |
9 | #include "condition-internal.hpp" |
10 | #include "consumer.hpp" | |
11 | #include "event-notifier-error-accounting.hpp" | |
12 | #include "kern-modules.hpp" | |
13 | #include "kernel-consumer.hpp" | |
14 | #include "kernel.hpp" | |
15 | #include "lttng-sessiond.hpp" | |
16 | #include "lttng-syscall.hpp" | |
17 | #include "modprobe.hpp" | |
18 | #include "notification-thread-commands.hpp" | |
19 | #include "rotate.hpp" | |
20 | #include "sessiond-config.hpp" | |
21 | #include "tracker.hpp" | |
22 | #include "utils.hpp" | |
20fe2104 | 23 | |
c9e313bc SM |
24 | #include <common/common.hpp> |
25 | #include <common/hashtable/utils.hpp> | |
c9e313bc SM |
26 | #include <common/kernel-ctl/kernel-ctl.hpp> |
27 | #include <common/kernel-ctl/kernel-ioctl.hpp> | |
28 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
28ab034a | 29 | #include <common/trace-chunk.hpp> |
c9e313bc SM |
30 | #include <common/tracker.hpp> |
31 | #include <common/utils.hpp> | |
1e307fab | 32 | |
c9e313bc | 33 | #include <lttng/condition/event-rule-matches-internal.hpp> |
28ab034a | 34 | #include <lttng/condition/event-rule-matches.h> |
c9e313bc | 35 | #include <lttng/event-rule/event-rule-internal.hpp> |
28ab034a | 36 | #include <lttng/event-rule/event-rule.h> |
c9e313bc | 37 | #include <lttng/event-rule/kernel-uprobe-internal.hpp> |
28ab034a JG |
38 | #include <lttng/event.h> |
39 | #include <lttng/lttng-error.h> | |
40 | #include <lttng/tracker.h> | |
41 | #include <lttng/userspace-probe-internal.hpp> | |
42 | #include <lttng/userspace-probe.h> | |
352b58f5 | 43 | |
28ab034a JG |
44 | #include <fcntl.h> |
45 | #include <inttypes.h> | |
46 | #include <stdio.h> | |
47 | #include <stdlib.h> | |
48 | #include <string.h> | |
49 | #include <sys/types.h> | |
50 | #include <unistd.h> | |
20fe2104 | 51 | |
e1f3997a JD |
52 | /* |
53 | * Key used to reference a channel between the sessiond and the consumer. This | |
54 | * is only read and updated with the session_list lock held. | |
55 | */ | |
56 | static uint64_t next_kernel_channel_key; | |
57 | ||
7d268848 MD |
58 | static const char *module_proc_lttng = "/proc/lttng"; |
59 | ||
60 | static int kernel_tracer_fd = -1; | |
352b58f5 JR |
61 | static int kernel_tracer_event_notifier_group_fd = -1; |
62 | static int kernel_tracer_event_notifier_group_notification_fd = -1; | |
63 | static struct cds_lfht *kernel_token_to_event_notifier_rule_ht; | |
7d268848 | 64 | |
d65106b1 | 65 | /* |
050349bb | 66 | * Add context on a kernel channel. |
df3c77c8 JG |
67 | * |
68 | * Assumes the ownership of ctx. | |
d65106b1 | 69 | */ |
28ab034a | 70 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, struct ltt_kernel_context *ctx) |
d65106b1 DG |
71 | { |
72 | int ret; | |
73 | ||
a0377dfe FD |
74 | LTTNG_ASSERT(chan); |
75 | LTTNG_ASSERT(ctx); | |
0525e9ae | 76 | |
d65106b1 | 77 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 78 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 79 | if (ret < 0) { |
32af2c95 | 80 | switch (-ret) { |
1ae5e83e JD |
81 | case ENOSYS: |
82 | /* Exists but not available for this kernel */ | |
83 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
84 | goto error; | |
85 | case EEXIST: | |
b579acd9 DG |
86 | /* If EEXIST, we just ignore the error */ |
87 | ret = 0; | |
1ae5e83e JD |
88 | goto end; |
89 | default: | |
90 | PERROR("add context ioctl"); | |
91 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
92 | goto error; | |
b579acd9 | 93 | } |
d65106b1 | 94 | } |
21ed98c1 | 95 | ret = 0; |
d65106b1 | 96 | |
1ae5e83e | 97 | end: |
645328ae | 98 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 99 | ctx->in_list = true; |
cd9adb8b | 100 | ctx = nullptr; |
d65106b1 | 101 | error: |
df3c77c8 JG |
102 | if (ctx) { |
103 | trace_kernel_destroy_context(ctx); | |
104 | } | |
d65106b1 DG |
105 | return ret; |
106 | } | |
107 | ||
20fe2104 | 108 | /* |
050349bb DG |
109 | * Create a new kernel session, register it to the kernel tracer and add it to |
110 | * the session daemon session. | |
20fe2104 | 111 | */ |
7d268848 | 112 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
113 | { |
114 | int ret; | |
115 | struct ltt_kernel_session *lks; | |
116 | ||
a0377dfe | 117 | LTTNG_ASSERT(session); |
0525e9ae | 118 | |
54012638 | 119 | /* Allocate data structure */ |
dec56f6c | 120 | lks = trace_kernel_create_session(); |
cd9adb8b | 121 | if (lks == nullptr) { |
54012638 | 122 | ret = -1; |
20fe2104 DG |
123 | goto error; |
124 | } | |
125 | ||
54012638 | 126 | /* Kernel tracer session creation */ |
7d268848 | 127 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 128 | if (ret < 0) { |
df0f840b | 129 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
130 | goto error; |
131 | } | |
132 | ||
20fe2104 | 133 | lks->fd = ret; |
7b395890 DG |
134 | /* Prevent fd duplication after execlp() */ |
135 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
136 | if (ret < 0) { | |
df0f840b | 137 | PERROR("fcntl session fd"); |
7b395890 DG |
138 | } |
139 | ||
53632229 | 140 | lks->id = session->id; |
3bd1e081 | 141 | lks->consumer_fds_sent = 0; |
8c0faa1d | 142 | session->kernel_session = lks; |
8c0faa1d DG |
143 | |
144 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 145 | |
8ff4109e JR |
146 | /* |
147 | * This is necessary since the creation time is present in the session | |
148 | * name when it is generated. | |
149 | */ | |
150 | if (session->has_auto_generated_name) { | |
151 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
152 | } else { | |
153 | ret = kernctl_session_set_name(lks->fd, session->name); | |
154 | } | |
155 | if (ret) { | |
156 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
28ab034a JG |
157 | session->id, |
158 | session->name); | |
8ff4109e JR |
159 | } |
160 | ||
e04b2181 JR |
161 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
162 | if (ret) { | |
163 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
28ab034a JG |
164 | session->id, |
165 | session->name); | |
e04b2181 JR |
166 | } |
167 | ||
20fe2104 DG |
168 | return 0; |
169 | ||
170 | error: | |
5f62c685 DG |
171 | if (lks) { |
172 | trace_kernel_destroy_session(lks); | |
d070c424 | 173 | trace_kernel_free_session(lks); |
5f62c685 | 174 | } |
20fe2104 DG |
175 | return ret; |
176 | } | |
177 | ||
178 | /* | |
050349bb DG |
179 | * Create a kernel channel, register it to the kernel tracer and add it to the |
180 | * kernel session. | |
20fe2104 | 181 | */ |
28ab034a | 182 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan) |
20fe2104 DG |
183 | { |
184 | int ret; | |
185 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 186 | |
a0377dfe FD |
187 | LTTNG_ASSERT(session); |
188 | LTTNG_ASSERT(chan); | |
0525e9ae | 189 | |
54012638 | 190 | /* Allocate kernel channel */ |
fdd9eb17 | 191 | lkc = trace_kernel_create_channel(chan); |
cd9adb8b | 192 | if (lkc == nullptr) { |
20fe2104 DG |
193 | goto error; |
194 | } | |
195 | ||
ecc48a90 | 196 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
28ab034a JG |
197 | chan->name, |
198 | lkc->channel->attr.overwrite, | |
199 | lkc->channel->attr.subbuf_size, | |
200 | lkc->channel->attr.num_subbuf, | |
201 | lkc->channel->attr.switch_timer_interval, | |
202 | lkc->channel->attr.read_timer_interval, | |
203 | lkc->channel->attr.live_timer_interval, | |
204 | lkc->channel->attr.output); | |
173af62f | 205 | |
54012638 | 206 | /* Kernel tracer channel creation */ |
f3ed775e | 207 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 208 | if (ret < 0) { |
df0f840b | 209 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
210 | goto error; |
211 | } | |
212 | ||
54012638 | 213 | /* Setup the channel fd */ |
20fe2104 | 214 | lkc->fd = ret; |
7b395890 DG |
215 | /* Prevent fd duplication after execlp() */ |
216 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
217 | if (ret < 0) { | |
df0f840b | 218 | PERROR("fcntl session fd"); |
7b395890 DG |
219 | } |
220 | ||
54012638 | 221 | /* Add channel to session */ |
8c0faa1d DG |
222 | cds_list_add(&lkc->list, &session->channel_list.head); |
223 | session->channel_count++; | |
fb5f35b6 | 224 | lkc->session = session; |
e1f3997a | 225 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 226 | |
e1f3997a | 227 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
228 | lkc->channel->name, |
229 | lkc->fd, | |
230 | lkc->key); | |
20fe2104 DG |
231 | |
232 | return 0; | |
233 | ||
234 | error: | |
5f62c685 DG |
235 | if (lkc) { |
236 | free(lkc->channel); | |
237 | free(lkc); | |
238 | } | |
54012638 | 239 | return -1; |
20fe2104 | 240 | } |
f34daff7 | 241 | |
352b58f5 JR |
242 | /* |
243 | * Create a kernel event notifier group, register it to the kernel tracer and | |
244 | * add it to the kernel session. | |
245 | */ | |
246 | static int kernel_create_event_notifier_group(int *event_notifier_group_fd) | |
247 | { | |
248 | int ret; | |
249 | int local_fd = -1; | |
250 | ||
a0377dfe | 251 | LTTNG_ASSERT(event_notifier_group_fd); |
352b58f5 JR |
252 | |
253 | /* Kernel event notifier group creation. */ | |
254 | ret = kernctl_create_event_notifier_group(kernel_tracer_fd); | |
255 | if (ret < 0) { | |
256 | PERROR("Failed to create kernel event notifier group"); | |
257 | ret = -1; | |
258 | goto error; | |
259 | } | |
260 | ||
261 | local_fd = ret; | |
262 | ||
263 | /* Prevent fd duplication after execlp(). */ | |
264 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
265 | if (ret < 0) { | |
266 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 267 | local_fd); |
352b58f5 JR |
268 | goto error; |
269 | } | |
270 | ||
271 | DBG("Created kernel event notifier group: fd = %d", local_fd); | |
272 | *event_notifier_group_fd = local_fd; | |
273 | local_fd = -1; | |
274 | ret = 0; | |
275 | error: | |
276 | if (local_fd >= 0) { | |
277 | ret = close(local_fd); | |
278 | if (ret) { | |
279 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 280 | local_fd); |
352b58f5 JR |
281 | } |
282 | } | |
283 | ||
284 | return ret; | |
285 | } | |
286 | ||
410b78a0 FD |
287 | /* |
288 | * Compute the offset of the instrumentation byte in the binary based on the | |
289 | * function probe location using the ELF lookup method. | |
290 | * | |
291 | * Returns 0 on success and set the offset out parameter to the offset of the | |
292 | * elf symbol | |
293 | * Returns -1 on error | |
294 | */ | |
28ab034a JG |
295 | static int extract_userspace_probe_offset_function_elf( |
296 | const struct lttng_userspace_probe_location *probe_location, | |
297 | uid_t uid, | |
298 | gid_t gid, | |
299 | uint64_t *offset) | |
410b78a0 FD |
300 | { |
301 | int fd; | |
302 | int ret = 0; | |
cd9adb8b JG |
303 | const char *symbol = nullptr; |
304 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; | |
410b78a0 FD |
305 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
306 | ||
a0377dfe | 307 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 308 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
410b78a0 | 309 | |
28ab034a | 310 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); |
410b78a0 FD |
311 | if (!lookup) { |
312 | ret = -1; | |
313 | goto end; | |
314 | } | |
315 | ||
28ab034a | 316 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 317 | |
a0377dfe | 318 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 319 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); |
410b78a0 | 320 | |
28ab034a | 321 | symbol = lttng_userspace_probe_location_function_get_function_name(probe_location); |
410b78a0 FD |
322 | if (!symbol) { |
323 | ret = -1; | |
324 | goto end; | |
325 | } | |
326 | ||
327 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
328 | if (fd < 0) { | |
329 | ret = -1; | |
330 | goto end; | |
331 | } | |
332 | ||
0a398bc4 | 333 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
334 | if (ret < 0) { |
335 | DBG("userspace probe offset calculation failed for " | |
28ab034a JG |
336 | "function %s", |
337 | symbol); | |
410b78a0 FD |
338 | goto end; |
339 | } | |
340 | ||
28ab034a | 341 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t) (*offset)); |
410b78a0 FD |
342 | end: |
343 | return ret; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
348 | * tracepoint probe location using the SDT lookup method. This function | |
349 | * allocates the offsets buffer, the caller must free it. | |
350 | * | |
351 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
352 | * SDT tracepoint. | |
353 | * Returns -1 on error. | |
354 | */ | |
28ab034a JG |
355 | static int extract_userspace_probe_offset_tracepoint_sdt( |
356 | const struct lttng_userspace_probe_location *probe_location, | |
357 | uid_t uid, | |
358 | gid_t gid, | |
359 | uint64_t **offsets, | |
360 | uint32_t *offsets_count) | |
410b78a0 FD |
361 | { |
362 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
cd9adb8b JG |
363 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; |
364 | const char *probe_name = nullptr, *provider_name = nullptr; | |
410b78a0 FD |
365 | int ret = 0; |
366 | int fd, i; | |
367 | ||
a0377dfe | 368 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 369 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
410b78a0 FD |
370 | |
371 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
372 | if (!lookup) { | |
373 | ret = -1; | |
374 | goto end; | |
375 | } | |
376 | ||
28ab034a | 377 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 378 | |
a0377dfe | 379 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 380 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); |
410b78a0 | 381 | |
28ab034a | 382 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(probe_location); |
410b78a0 FD |
383 | if (!probe_name) { |
384 | ret = -1; | |
385 | goto end; | |
386 | } | |
387 | ||
28ab034a | 388 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(probe_location); |
410b78a0 FD |
389 | if (!provider_name) { |
390 | ret = -1; | |
391 | goto end; | |
392 | } | |
393 | ||
394 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
395 | if (fd < 0) { | |
396 | ret = -1; | |
397 | goto end; | |
398 | } | |
399 | ||
28ab034a JG |
400 | ret = run_as_extract_sdt_probe_offsets( |
401 | fd, provider_name, probe_name, uid, gid, offsets, offsets_count); | |
410b78a0 FD |
402 | if (ret < 0) { |
403 | DBG("userspace probe offset calculation failed for sdt " | |
28ab034a JG |
404 | "probe %s:%s", |
405 | provider_name, | |
406 | probe_name); | |
410b78a0 FD |
407 | goto end; |
408 | } | |
409 | ||
410 | if (*offsets_count == 0) { | |
411 | DBG("no userspace probe offset found"); | |
412 | goto end; | |
413 | } | |
414 | ||
415 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
28ab034a JG |
416 | *offsets_count, |
417 | provider_name, | |
418 | probe_name); | |
410b78a0 | 419 | for (i = 0; i < *offsets_count; i++) { |
28ab034a | 420 | DBG("\t0x%jd", (intmax_t) ((*offsets)[i])); |
410b78a0 FD |
421 | } |
422 | end: | |
423 | return ret; | |
424 | } | |
425 | ||
28ab034a JG |
426 | static int userspace_probe_add_callsite(const struct lttng_userspace_probe_location *location, |
427 | uid_t uid, | |
428 | gid_t gid, | |
429 | int fd) | |
410b78a0 | 430 | { |
cd9adb8b | 431 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = nullptr; |
410b78a0 | 432 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
433 | int ret; |
434 | ||
0a398bc4 | 435 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
436 | if (!lookup_method) { |
437 | ret = -1; | |
438 | goto end; | |
439 | } | |
440 | ||
441 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
442 | switch (type) { | |
443 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
444 | { | |
b8e2fb80 | 445 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
446 | uint64_t offset; |
447 | ||
28ab034a | 448 | ret = extract_userspace_probe_offset_function_elf(location, uid, gid, &offset); |
410b78a0 FD |
449 | if (ret) { |
450 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
451 | goto end; | |
452 | } | |
453 | ||
454 | callsite.u.uprobe.offset = offset; | |
455 | ret = kernctl_add_callsite(fd, &callsite); | |
456 | if (ret) { | |
0a398bc4 | 457 | WARN("Failed to add callsite to ELF userspace probe."); |
410b78a0 FD |
458 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
459 | goto end; | |
460 | } | |
461 | break; | |
462 | } | |
463 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
464 | { | |
465 | int i; | |
cd9adb8b | 466 | uint64_t *offsets = nullptr; |
410b78a0 | 467 | uint32_t offsets_count; |
b8e2fb80 | 468 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
469 | |
470 | /* | |
471 | * This call allocates the offsets buffer. This buffer must be freed | |
472 | * by the caller | |
473 | */ | |
28ab034a JG |
474 | ret = extract_userspace_probe_offset_tracepoint_sdt( |
475 | location, uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
476 | if (ret) { |
477 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
478 | goto end; | |
479 | } | |
480 | for (i = 0; i < offsets_count; i++) { | |
481 | callsite.u.uprobe.offset = offsets[i]; | |
482 | ret = kernctl_add_callsite(fd, &callsite); | |
483 | if (ret) { | |
0a398bc4 | 484 | WARN("Failed to add callsite to SDT userspace probe"); |
410b78a0 FD |
485 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
486 | free(offsets); | |
487 | goto end; | |
488 | } | |
489 | } | |
490 | free(offsets); | |
491 | break; | |
492 | } | |
493 | default: | |
494 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
495 | goto end; | |
496 | } | |
497 | end: | |
498 | return ret; | |
499 | } | |
500 | ||
0a398bc4 FD |
501 | /* |
502 | * Extract the offsets of the instrumentation point for the different lookup | |
503 | * methods. | |
504 | */ | |
28ab034a JG |
505 | static int userspace_probe_event_add_callsites(struct lttng_event *ev, |
506 | struct ltt_kernel_session *session, | |
507 | int fd) | |
0a398bc4 FD |
508 | { |
509 | int ret; | |
cd9adb8b | 510 | const struct lttng_userspace_probe_location *location = nullptr; |
0a398bc4 | 511 | |
a0377dfe FD |
512 | LTTNG_ASSERT(ev); |
513 | LTTNG_ASSERT(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
0a398bc4 FD |
514 | |
515 | location = lttng_event_get_userspace_probe_location(ev); | |
516 | if (!location) { | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
28ab034a | 521 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, fd); |
0a398bc4 | 522 | if (ret) { |
28ab034a | 523 | WARN("Failed to add callsite to userspace probe event '%s'", ev->name); |
0a398bc4 FD |
524 | } |
525 | ||
526 | end: | |
527 | return ret; | |
528 | } | |
529 | ||
352b58f5 JR |
530 | /* |
531 | * Extract the offsets of the instrumentation point for the different look-up | |
532 | * methods. | |
533 | */ | |
28ab034a JG |
534 | static int userspace_probe_event_rule_add_callsites(const struct lttng_event_rule *rule, |
535 | const struct lttng_credentials *creds, | |
536 | int fd) | |
352b58f5 JR |
537 | { |
538 | int ret; | |
539 | enum lttng_event_rule_status status; | |
540 | enum lttng_event_rule_type event_rule_type; | |
cd9adb8b | 541 | const struct lttng_userspace_probe_location *location = nullptr; |
352b58f5 | 542 | |
a0377dfe FD |
543 | LTTNG_ASSERT(rule); |
544 | LTTNG_ASSERT(creds); | |
352b58f5 JR |
545 | |
546 | event_rule_type = lttng_event_rule_get_type(rule); | |
a0377dfe | 547 | LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
352b58f5 | 548 | |
46fd07ac | 549 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); |
352b58f5 JR |
550 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { |
551 | ret = -1; | |
552 | goto end; | |
553 | } | |
554 | ||
28ab034a JG |
555 | ret = userspace_probe_add_callsite( |
556 | location, lttng_credentials_get_uid(creds), lttng_credentials_get_gid(creds), fd); | |
352b58f5 | 557 | if (ret) { |
28ab034a | 558 | WARN("Failed to add callsite to user space probe object: fd = %d", fd); |
352b58f5 JR |
559 | } |
560 | ||
561 | end: | |
562 | return ret; | |
563 | } | |
564 | ||
f34daff7 | 565 | /* |
050349bb DG |
566 | * Create a kernel event, enable it to the kernel tracer and add it to the |
567 | * channel event list of the kernel session. | |
49d21f93 | 568 | * We own filter_expression and filter. |
f34daff7 | 569 | */ |
050349bb | 570 | int kernel_create_event(struct lttng_event *ev, |
28ab034a JG |
571 | struct ltt_kernel_channel *channel, |
572 | char *filter_expression, | |
573 | struct lttng_bytecode *filter) | |
f34daff7 | 574 | { |
71a3bb01 FD |
575 | int err, fd; |
576 | enum lttng_error_code ret; | |
f34daff7 | 577 | struct ltt_kernel_event *event; |
f34daff7 | 578 | |
a0377dfe FD |
579 | LTTNG_ASSERT(ev); |
580 | LTTNG_ASSERT(channel); | |
0525e9ae | 581 | |
a969e101 | 582 | /* We pass ownership of filter_expression and filter */ |
28ab034a | 583 | ret = trace_kernel_create_event(ev, filter_expression, filter, &event); |
71a3bb01 | 584 | if (ret != LTTNG_OK) { |
f34daff7 DG |
585 | goto error; |
586 | } | |
587 | ||
71a3bb01 FD |
588 | fd = kernctl_create_event(channel->fd, event->event); |
589 | if (fd < 0) { | |
590 | switch (-fd) { | |
bd29c13d | 591 | case EEXIST: |
71a3bb01 | 592 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
593 | break; |
594 | case ENOSYS: | |
595 | WARN("Event type not implemented"); | |
71a3bb01 | 596 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 597 | break; |
8197a339 DG |
598 | case ENOENT: |
599 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 600 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 601 | break; |
bd29c13d | 602 | default: |
71a3bb01 | 603 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
604 | PERROR("create event ioctl"); |
605 | } | |
e953ef25 | 606 | goto free_event; |
8c0faa1d | 607 | } |
f34daff7 | 608 | |
d0ae4ea8 | 609 | event->type = ev->type; |
71a3bb01 | 610 | event->fd = fd; |
7b395890 | 611 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
612 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
613 | if (err < 0) { | |
df0f840b | 614 | PERROR("fcntl session fd"); |
7b395890 DG |
615 | } |
616 | ||
00a62084 | 617 | if (filter) { |
71a3bb01 FD |
618 | err = kernctl_filter(event->fd, filter); |
619 | if (err < 0) { | |
620 | switch (-err) { | |
621 | case ENOMEM: | |
622 | ret = LTTNG_ERR_FILTER_NOMEM; | |
623 | break; | |
624 | default: | |
625 | ret = LTTNG_ERR_FILTER_INVAL; | |
626 | break; | |
627 | } | |
00a62084 MD |
628 | goto filter_error; |
629 | } | |
630 | } | |
631 | ||
dcabc190 | 632 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
28ab034a JG |
633 | ret = (lttng_error_code) userspace_probe_event_add_callsites( |
634 | ev, channel->session, event->fd); | |
dcabc190 FD |
635 | if (ret) { |
636 | goto add_callsite_error; | |
637 | } | |
638 | } | |
639 | ||
71a3bb01 FD |
640 | err = kernctl_enable(event->fd); |
641 | if (err < 0) { | |
642 | switch (-err) { | |
00a62084 MD |
643 | case EEXIST: |
644 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
645 | break; | |
646 | default: | |
647 | PERROR("enable kernel event"); | |
71a3bb01 | 648 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
649 | break; |
650 | } | |
651 | goto enable_error; | |
652 | } | |
653 | ||
f3ed775e DG |
654 | /* Add event to event list */ |
655 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
656 | channel->event_count++; |
657 | ||
e953ef25 DG |
658 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
659 | ||
660 | return 0; | |
661 | ||
dcabc190 | 662 | add_callsite_error: |
00a62084 MD |
663 | enable_error: |
664 | filter_error: | |
28ab034a JG |
665 | { |
666 | int closeret; | |
00a62084 | 667 | |
28ab034a JG |
668 | closeret = close(event->fd); |
669 | if (closeret) { | |
670 | PERROR("close event fd"); | |
00a62084 | 671 | } |
28ab034a | 672 | } |
e953ef25 DG |
673 | free_event: |
674 | free(event); | |
675 | error: | |
d87bfb32 | 676 | return ret; |
e953ef25 DG |
677 | } |
678 | ||
26cc6b4e | 679 | /* |
050349bb | 680 | * Disable a kernel channel. |
26cc6b4e DG |
681 | */ |
682 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
683 | { | |
684 | int ret; | |
685 | ||
a0377dfe | 686 | LTTNG_ASSERT(chan); |
0525e9ae | 687 | |
26cc6b4e DG |
688 | ret = kernctl_disable(chan->fd); |
689 | if (ret < 0) { | |
df0f840b | 690 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
691 | goto error; |
692 | } | |
693 | ||
694 | chan->enabled = 0; | |
e1f3997a | 695 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
696 | chan->channel->name, |
697 | chan->fd, | |
698 | chan->key); | |
26cc6b4e DG |
699 | |
700 | return 0; | |
701 | ||
702 | error: | |
703 | return ret; | |
704 | } | |
705 | ||
d36b8583 | 706 | /* |
050349bb | 707 | * Enable a kernel channel. |
d36b8583 DG |
708 | */ |
709 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
710 | { | |
711 | int ret; | |
712 | ||
a0377dfe | 713 | LTTNG_ASSERT(chan); |
0525e9ae | 714 | |
d36b8583 | 715 | ret = kernctl_enable(chan->fd); |
32af2c95 | 716 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 717 | PERROR("Enable kernel chan"); |
d36b8583 DG |
718 | goto error; |
719 | } | |
720 | ||
721 | chan->enabled = 1; | |
e1f3997a | 722 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
723 | chan->channel->name, |
724 | chan->fd, | |
725 | chan->key); | |
d36b8583 DG |
726 | |
727 | return 0; | |
728 | ||
729 | error: | |
730 | return ret; | |
731 | } | |
732 | ||
19e70852 | 733 | /* |
050349bb | 734 | * Enable a kernel event. |
19e70852 DG |
735 | */ |
736 | int kernel_enable_event(struct ltt_kernel_event *event) | |
737 | { | |
738 | int ret; | |
739 | ||
a0377dfe | 740 | LTTNG_ASSERT(event); |
0525e9ae | 741 | |
19e70852 | 742 | ret = kernctl_enable(event->fd); |
42224349 | 743 | if (ret < 0) { |
32af2c95 | 744 | switch (-ret) { |
42224349 | 745 | case EEXIST: |
f73fabfd | 746 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
747 | break; |
748 | default: | |
749 | PERROR("enable kernel event"); | |
750 | break; | |
751 | } | |
19e70852 DG |
752 | goto error; |
753 | } | |
754 | ||
755 | event->enabled = 1; | |
756 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
757 | ||
758 | return 0; | |
759 | ||
760 | error: | |
d36b8583 | 761 | return ret; |
19e70852 DG |
762 | } |
763 | ||
e953ef25 | 764 | /* |
050349bb | 765 | * Disable a kernel event. |
e953ef25 | 766 | */ |
19e70852 | 767 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
768 | { |
769 | int ret; | |
19e70852 | 770 | |
a0377dfe | 771 | LTTNG_ASSERT(event); |
0525e9ae | 772 | |
19e70852 | 773 | ret = kernctl_disable(event->fd); |
42224349 | 774 | if (ret < 0) { |
d79bd829 | 775 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
28ab034a JG |
776 | event->event->name, |
777 | event->fd); | |
19e70852 | 778 | goto error; |
e953ef25 | 779 | } |
f3ed775e | 780 | |
19e70852 DG |
781 | event->enabled = 0; |
782 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
783 | ||
f34daff7 DG |
784 | return 0; |
785 | ||
786 | error: | |
d36b8583 | 787 | return ret; |
f34daff7 | 788 | } |
aaf26714 | 789 | |
352b58f5 JR |
790 | /* |
791 | * Disable a kernel event notifier. | |
792 | */ | |
28ab034a | 793 | static int kernel_disable_event_notifier_rule(struct ltt_kernel_event_notifier_rule *event) |
352b58f5 JR |
794 | { |
795 | int ret; | |
796 | ||
a0377dfe | 797 | LTTNG_ASSERT(event); |
352b58f5 JR |
798 | |
799 | rcu_read_lock(); | |
800 | cds_lfht_del(kernel_token_to_event_notifier_rule_ht, &event->ht_node); | |
801 | rcu_read_unlock(); | |
802 | ||
803 | ret = kernctl_disable(event->fd); | |
804 | if (ret < 0) { | |
d79bd829 | 805 | PERROR("Failed to disable kernel event notifier: fd = %d, token = %" PRIu64, |
28ab034a JG |
806 | event->fd, |
807 | event->token); | |
352b58f5 JR |
808 | goto error; |
809 | } | |
810 | ||
811 | event->enabled = 0; | |
28ab034a | 812 | DBG("Disabled kernel event notifier: fd = %d, token = %" PRIu64, event->fd, event->token); |
352b58f5 JR |
813 | |
814 | error: | |
815 | return ret; | |
816 | } | |
817 | ||
28ab034a JG |
818 | static struct process_attr_tracker * |
819 | _kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
820 | enum lttng_process_attr process_attr) | |
55c9e7ca | 821 | { |
159b042f JG |
822 | switch (process_attr) { |
823 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
824 | return session->tracker_pid; | |
825 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
826 | return session->tracker_vpid; | |
827 | case LTTNG_PROCESS_ATTR_USER_ID: | |
828 | return session->tracker_uid; | |
829 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
830 | return session->tracker_vuid; | |
831 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
832 | return session->tracker_gid; | |
833 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
834 | return session->tracker_vgid; | |
55c9e7ca | 835 | default: |
cd9adb8b | 836 | return nullptr; |
55c9e7ca JR |
837 | } |
838 | } | |
6e911cad | 839 | |
28ab034a JG |
840 | const struct process_attr_tracker * |
841 | kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
842 | enum lttng_process_attr process_attr) | |
ccf10263 | 843 | { |
28ab034a JG |
844 | return (const struct process_attr_tracker *) _kernel_get_process_attr_tracker(session, |
845 | process_attr); | |
159b042f | 846 | } |
7c493d31 | 847 | |
28ab034a JG |
848 | enum lttng_error_code |
849 | kernel_process_attr_tracker_set_tracking_policy(struct ltt_kernel_session *session, | |
850 | enum lttng_process_attr process_attr, | |
851 | enum lttng_tracking_policy policy) | |
159b042f JG |
852 | { |
853 | int ret; | |
854 | enum lttng_error_code ret_code = LTTNG_OK; | |
855 | struct process_attr_tracker *tracker = | |
28ab034a | 856 | _kernel_get_process_attr_tracker(session, process_attr); |
159b042f | 857 | enum lttng_tracking_policy previous_policy; |
55c9e7ca | 858 | |
159b042f JG |
859 | if (!tracker) { |
860 | ret_code = LTTNG_ERR_INVALID; | |
861 | goto end; | |
7c493d31 | 862 | } |
ccf10263 | 863 | |
159b042f JG |
864 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
865 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
866 | if (ret) { | |
867 | ret_code = LTTNG_ERR_UNK; | |
868 | goto end; | |
55c9e7ca | 869 | } |
7c493d31 | 870 | |
159b042f | 871 | if (previous_policy == policy) { |
55c9e7ca | 872 | goto end; |
7c493d31 | 873 | } |
55c9e7ca | 874 | |
159b042f JG |
875 | switch (policy) { |
876 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
877 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
878 | /* | |
879 | * Maintain a special case for the process ID process | |
880 | * attribute tracker as it was the only supported | |
881 | * attribute prior to 2.12. | |
882 | */ | |
883 | ret = kernctl_track_pid(session->fd, -1); | |
884 | } else { | |
885 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
886 | } |
887 | break; | |
159b042f JG |
888 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
889 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
890 | /* fall-through. */ | |
891 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
892 | /* | |
893 | * Maintain a special case for the process ID process | |
894 | * attribute tracker as it was the only supported | |
895 | * attribute prior to 2.12. | |
896 | */ | |
897 | ret = kernctl_untrack_pid(session->fd, -1); | |
898 | } else { | |
899 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
900 | } |
901 | break; | |
902 | default: | |
159b042f | 903 | abort(); |
55c9e7ca | 904 | } |
159b042f | 905 | /* kern-ctl error handling */ |
32af2c95 | 906 | switch (-ret) { |
159b042f JG |
907 | case 0: |
908 | ret_code = LTTNG_OK; | |
909 | break; | |
7c493d31 | 910 | case EINVAL: |
159b042f | 911 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 912 | break; |
7c493d31 | 913 | case ENOMEM: |
159b042f | 914 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
915 | break; |
916 | case EEXIST: | |
159b042f | 917 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 918 | break; |
7c493d31 | 919 | default: |
159b042f | 920 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
921 | break; |
922 | } | |
55c9e7ca | 923 | end: |
159b042f | 924 | return ret_code; |
ccf10263 MD |
925 | } |
926 | ||
28ab034a JG |
927 | enum lttng_error_code |
928 | kernel_process_attr_tracker_inclusion_set_add_value(struct ltt_kernel_session *session, | |
929 | enum lttng_process_attr process_attr, | |
930 | const struct process_attr_value *value) | |
a5dfbb9d | 931 | { |
159b042f JG |
932 | int ret, integral_value; |
933 | enum lttng_error_code ret_code; | |
934 | struct process_attr_tracker *tracker; | |
935 | enum process_attr_tracker_status status; | |
a5dfbb9d | 936 | |
159b042f JG |
937 | /* |
938 | * Convert process attribute tracker value to the integral | |
939 | * representation required by the kern-ctl API. | |
940 | */ | |
941 | switch (process_attr) { | |
942 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
943 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
944 | integral_value = (int) value->value.pid; | |
55c9e7ca | 945 | break; |
159b042f JG |
946 | case LTTNG_PROCESS_ATTR_USER_ID: |
947 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
948 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
949 | uid_t uid; | |
950 | ||
28ab034a | 951 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
952 | if (ret_code != LTTNG_OK) { |
953 | goto end; | |
954 | } | |
955 | integral_value = (int) uid; | |
956 | } else { | |
957 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
958 | } |
959 | break; | |
159b042f JG |
960 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
961 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
962 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
963 | gid_t gid; | |
964 | ||
28ab034a | 965 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
966 | if (ret_code != LTTNG_OK) { |
967 | goto end; | |
968 | } | |
969 | integral_value = (int) gid; | |
970 | } else { | |
971 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 972 | } |
55c9e7ca JR |
973 | break; |
974 | default: | |
159b042f JG |
975 | ret_code = LTTNG_ERR_INVALID; |
976 | goto end; | |
55c9e7ca JR |
977 | } |
978 | ||
159b042f JG |
979 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
980 | if (!tracker) { | |
981 | ret_code = LTTNG_ERR_INVALID; | |
982 | goto end; | |
983 | } | |
984 | ||
985 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
986 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
987 | switch (status) { | |
988 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
989 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
990 | break; | |
991 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
992 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
993 | break; | |
994 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
995 | default: | |
996 | ret_code = LTTNG_ERR_UNK; | |
997 | break; | |
998 | } | |
999 | goto end; | |
1000 | } | |
1001 | ||
1002 | DBG("Kernel track %s %d for session id %" PRIu64, | |
28ab034a JG |
1003 | lttng_process_attr_to_string(process_attr), |
1004 | integral_value, | |
1005 | session->id); | |
159b042f JG |
1006 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1007 | /* | |
1008 | * Maintain a special case for the process ID process attribute | |
1009 | * tracker as it was the only supported attribute prior to 2.12. | |
1010 | */ | |
1011 | ret = kernctl_track_pid(session->fd, integral_value); | |
1012 | } else { | |
28ab034a | 1013 | ret = kernctl_track_id(session->fd, process_attr, integral_value); |
159b042f JG |
1014 | } |
1015 | if (ret == 0) { | |
1016 | ret_code = LTTNG_OK; | |
1017 | goto end; | |
1018 | } | |
1019 | ||
1020 | kernel_wait_quiescent(); | |
1021 | ||
1022 | /* kern-ctl error handling */ | |
55c9e7ca | 1023 | switch (-ret) { |
159b042f JG |
1024 | case 0: |
1025 | ret_code = LTTNG_OK; | |
1026 | break; | |
55c9e7ca | 1027 | case EINVAL: |
159b042f | 1028 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1029 | break; |
1030 | case ENOMEM: | |
159b042f | 1031 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1032 | break; |
1033 | case EEXIST: | |
159b042f | 1034 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1035 | break; |
1036 | default: | |
159b042f | 1037 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1038 | break; |
a5dfbb9d MD |
1039 | } |
1040 | ||
159b042f | 1041 | /* Attempt to remove the value from the tracker. */ |
28ab034a | 1042 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1043 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1044 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1045 | lttng_process_attr_to_string(process_attr), |
1046 | integral_value); | |
55c9e7ca | 1047 | } |
a5dfbb9d | 1048 | end: |
159b042f | 1049 | return ret_code; |
55c9e7ca | 1050 | } |
a5dfbb9d | 1051 | |
28ab034a JG |
1052 | enum lttng_error_code |
1053 | kernel_process_attr_tracker_inclusion_set_remove_value(struct ltt_kernel_session *session, | |
1054 | enum lttng_process_attr process_attr, | |
1055 | const struct process_attr_value *value) | |
55c9e7ca | 1056 | { |
159b042f JG |
1057 | int ret, integral_value; |
1058 | enum lttng_error_code ret_code; | |
1059 | struct process_attr_tracker *tracker; | |
1060 | enum process_attr_tracker_status status; | |
1061 | ||
1062 | /* | |
1063 | * Convert process attribute tracker value to the integral | |
1064 | * representation required by the kern-ctl API. | |
1065 | */ | |
1066 | switch (process_attr) { | |
1067 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1068 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1069 | integral_value = (int) value->value.pid; | |
1070 | break; | |
1071 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1072 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1073 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1074 | uid_t uid; | |
1075 | ||
28ab034a | 1076 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
1077 | if (ret_code != LTTNG_OK) { |
1078 | goto end; | |
1079 | } | |
1080 | integral_value = (int) uid; | |
1081 | } else { | |
1082 | integral_value = (int) value->value.uid; | |
1083 | } | |
1084 | break; | |
1085 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1086 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1087 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1088 | gid_t gid; | |
1089 | ||
28ab034a | 1090 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
1091 | if (ret_code != LTTNG_OK) { |
1092 | goto end; | |
1093 | } | |
1094 | integral_value = (int) gid; | |
1095 | } else { | |
1096 | integral_value = (int) value->value.gid; | |
1097 | } | |
1098 | break; | |
1099 | default: | |
1100 | ret_code = LTTNG_ERR_INVALID; | |
1101 | goto end; | |
1102 | } | |
55c9e7ca | 1103 | |
159b042f JG |
1104 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1105 | if (!tracker) { | |
1106 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1107 | goto end; |
a5dfbb9d | 1108 | } |
a7a533cd | 1109 | |
28ab034a | 1110 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1111 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1112 | switch (status) { | |
1113 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1114 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1115 | break; | |
1116 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1117 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1118 | break; | |
1119 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1120 | default: | |
1121 | ret_code = LTTNG_ERR_UNK; | |
1122 | break; | |
1123 | } | |
a7a533cd JR |
1124 | goto end; |
1125 | } | |
1126 | ||
159b042f | 1127 | DBG("Kernel track %s %d for session id %" PRIu64, |
28ab034a JG |
1128 | lttng_process_attr_to_string(process_attr), |
1129 | integral_value, | |
1130 | session->id); | |
159b042f JG |
1131 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1132 | /* | |
1133 | * Maintain a special case for the process ID process attribute | |
1134 | * tracker as it was the only supported attribute prior to 2.12. | |
1135 | */ | |
1136 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1137 | } else { | |
28ab034a | 1138 | ret = kernctl_untrack_id(session->fd, process_attr, integral_value); |
159b042f JG |
1139 | } |
1140 | if (ret == 0) { | |
1141 | ret_code = LTTNG_OK; | |
1142 | goto end; | |
1143 | } | |
1144 | kernel_wait_quiescent(); | |
1145 | ||
1146 | /* kern-ctl error handling */ | |
1147 | switch (-ret) { | |
1148 | case 0: | |
1149 | ret_code = LTTNG_OK; | |
1150 | break; | |
1151 | case EINVAL: | |
1152 | ret_code = LTTNG_ERR_INVALID; | |
1153 | break; | |
1154 | case ENOMEM: | |
1155 | ret_code = LTTNG_ERR_NOMEM; | |
1156 | break; | |
1157 | case ENOENT: | |
1158 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1159 | break; | |
1160 | default: | |
1161 | ret_code = LTTNG_ERR_UNK; | |
1162 | break; | |
1163 | } | |
1164 | ||
1165 | /* Attempt to add the value to the tracker. */ | |
28ab034a | 1166 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); |
159b042f JG |
1167 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1168 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1169 | lttng_process_attr_to_string(process_attr), |
1170 | integral_value); | |
159b042f | 1171 | } |
a7a533cd | 1172 | end: |
159b042f | 1173 | return ret_code; |
a5dfbb9d MD |
1174 | } |
1175 | ||
aaf26714 | 1176 | /* |
050349bb DG |
1177 | * Create kernel metadata, open from the kernel tracer and add it to the |
1178 | * kernel session. | |
aaf26714 | 1179 | */ |
a4b92340 | 1180 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1181 | { |
1182 | int ret; | |
cd9adb8b | 1183 | struct ltt_kernel_metadata *lkm = nullptr; |
aaf26714 | 1184 | |
a0377dfe | 1185 | LTTNG_ASSERT(session); |
0525e9ae | 1186 | |
54012638 | 1187 | /* Allocate kernel metadata */ |
a4b92340 | 1188 | lkm = trace_kernel_create_metadata(); |
cd9adb8b | 1189 | if (lkm == nullptr) { |
aaf26714 DG |
1190 | goto error; |
1191 | } | |
1192 | ||
54012638 | 1193 | /* Kernel tracer metadata creation */ |
f3ed775e | 1194 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1195 | if (ret < 0) { |
74024a21 | 1196 | goto error_open; |
aaf26714 DG |
1197 | } |
1198 | ||
8c0faa1d | 1199 | lkm->fd = ret; |
d40f0359 | 1200 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1201 | /* Prevent fd duplication after execlp() */ |
1202 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1203 | if (ret < 0) { | |
df0f840b | 1204 | PERROR("fcntl session fd"); |
7b395890 DG |
1205 | } |
1206 | ||
aaf26714 | 1207 | session->metadata = lkm; |
8c0faa1d | 1208 | |
00e2e675 | 1209 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1210 | |
1211 | return 0; | |
1212 | ||
74024a21 DG |
1213 | error_open: |
1214 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1215 | error: |
54012638 | 1216 | return -1; |
8c0faa1d DG |
1217 | } |
1218 | ||
1219 | /* | |
050349bb | 1220 | * Start tracing session. |
8c0faa1d DG |
1221 | */ |
1222 | int kernel_start_session(struct ltt_kernel_session *session) | |
1223 | { | |
1224 | int ret; | |
1225 | ||
a0377dfe | 1226 | LTTNG_ASSERT(session); |
0525e9ae | 1227 | |
8c0faa1d DG |
1228 | ret = kernctl_start_session(session->fd); |
1229 | if (ret < 0) { | |
df0f840b | 1230 | PERROR("ioctl start session"); |
8c0faa1d DG |
1231 | goto error; |
1232 | } | |
1233 | ||
1234 | DBG("Kernel session started"); | |
1235 | ||
1236 | return 0; | |
1237 | ||
1238 | error: | |
1239 | return ret; | |
1240 | } | |
1241 | ||
f3ed775e | 1242 | /* |
050349bb | 1243 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1244 | */ |
cd9adb8b | 1245 | void kernel_wait_quiescent() |
f3ed775e DG |
1246 | { |
1247 | int ret; | |
7d268848 | 1248 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1249 | |
1250 | DBG("Kernel quiescent wait on %d", fd); | |
1251 | ||
1252 | ret = kernctl_wait_quiescent(fd); | |
1253 | if (ret < 0) { | |
df0f840b | 1254 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1255 | ERR("Kernel quiescent wait failed"); |
1256 | } | |
1257 | } | |
1258 | ||
1259 | /* | |
f3ed775e DG |
1260 | * Force flush buffer of metadata. |
1261 | */ | |
1262 | int kernel_metadata_flush_buffer(int fd) | |
1263 | { | |
1264 | int ret; | |
1265 | ||
169d2cb7 DG |
1266 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1267 | ||
f3ed775e DG |
1268 | ret = kernctl_buffer_flush(fd); |
1269 | if (ret < 0) { | |
00e2e675 | 1270 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1271 | } |
1272 | ||
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | /* | |
050349bb | 1277 | * Force flush buffer for channel. |
f3ed775e DG |
1278 | */ |
1279 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1280 | { | |
1281 | int ret; | |
1282 | struct ltt_kernel_stream *stream; | |
1283 | ||
a0377dfe | 1284 | LTTNG_ASSERT(channel); |
0525e9ae | 1285 | |
f3ed775e DG |
1286 | DBG("Flush buffer for channel %s", channel->channel->name); |
1287 | ||
28ab034a | 1288 | cds_list_for_each_entry (stream, &channel->stream_list.head, list) { |
f3ed775e DG |
1289 | DBG("Flushing channel stream %d", stream->fd); |
1290 | ret = kernctl_buffer_flush(stream->fd); | |
1291 | if (ret < 0) { | |
df0f840b | 1292 | PERROR("ioctl"); |
28ab034a | 1293 | ERR("Fail to flush buffer for stream %d (ret: %d)", stream->fd, ret); |
f3ed775e DG |
1294 | } |
1295 | } | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
8c0faa1d | 1300 | /* |
050349bb | 1301 | * Stop tracing session. |
8c0faa1d DG |
1302 | */ |
1303 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1304 | { | |
1305 | int ret; | |
1306 | ||
a0377dfe | 1307 | LTTNG_ASSERT(session); |
0525e9ae | 1308 | |
8c0faa1d DG |
1309 | ret = kernctl_stop_session(session->fd); |
1310 | if (ret < 0) { | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1314 | DBG("Kernel session stopped"); | |
1315 | ||
1316 | return 0; | |
1317 | ||
1318 | error: | |
1319 | return ret; | |
1320 | } | |
1321 | ||
1322 | /* | |
050349bb DG |
1323 | * Open stream of channel, register it to the kernel tracer and add it |
1324 | * to the stream list of the channel. | |
8c0faa1d | 1325 | * |
1cfb4b98 MD |
1326 | * Note: given that the streams may appear in random order wrt CPU |
1327 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1328 | * the stream name is not necessarily linked to the CPU number. | |
1329 | * | |
050349bb | 1330 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1331 | */ |
f3ed775e | 1332 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1333 | { |
1cfb4b98 | 1334 | int ret; |
8c0faa1d DG |
1335 | struct ltt_kernel_stream *lks; |
1336 | ||
a0377dfe | 1337 | LTTNG_ASSERT(channel); |
0525e9ae | 1338 | |
5a47c6a2 | 1339 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
28ab034a | 1340 | lks = trace_kernel_create_stream(channel->channel->name, channel->stream_count); |
cd9adb8b | 1341 | if (lks == nullptr) { |
799e2c4f MD |
1342 | ret = close(ret); |
1343 | if (ret) { | |
1344 | PERROR("close"); | |
1345 | } | |
8c0faa1d DG |
1346 | goto error; |
1347 | } | |
1348 | ||
1349 | lks->fd = ret; | |
7b395890 DG |
1350 | /* Prevent fd duplication after execlp() */ |
1351 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1352 | if (ret < 0) { | |
df0f840b | 1353 | PERROR("fcntl session fd"); |
7b395890 DG |
1354 | } |
1355 | ||
1624d5b7 JD |
1356 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1357 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1358 | ||
1cfb4b98 | 1359 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1360 | cds_list_add(&lks->list, &channel->stream_list.head); |
1361 | channel->stream_count++; | |
8c0faa1d | 1362 | |
28ab034a | 1363 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, lks->state); |
54012638 | 1364 | } |
8c0faa1d DG |
1365 | |
1366 | return channel->stream_count; | |
1367 | ||
1368 | error: | |
54012638 | 1369 | return -1; |
8c0faa1d DG |
1370 | } |
1371 | ||
1372 | /* | |
050349bb | 1373 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1374 | */ |
f3ed775e | 1375 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1376 | { |
1377 | int ret; | |
1378 | ||
a0377dfe | 1379 | LTTNG_ASSERT(session); |
0525e9ae | 1380 | |
8c0faa1d DG |
1381 | ret = kernctl_create_stream(session->metadata->fd); |
1382 | if (ret < 0) { | |
df0f840b | 1383 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1384 | goto error; |
1385 | } | |
1386 | ||
1387 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1388 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1389 | /* Prevent fd duplication after execlp() */ |
1390 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1391 | if (ret < 0) { | |
df0f840b | 1392 | PERROR("fcntl session fd"); |
7b395890 | 1393 | } |
aaf26714 DG |
1394 | |
1395 | return 0; | |
1396 | ||
1397 | error: | |
54012638 | 1398 | return -1; |
aaf26714 | 1399 | } |
2ef84c95 DG |
1400 | |
1401 | /* | |
9f19cc17 | 1402 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1403 | */ |
7d268848 | 1404 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1405 | { |
53efb85a | 1406 | int fd, ret; |
9f19cc17 DG |
1407 | char *event; |
1408 | size_t nbmem, count = 0; | |
2ef84c95 | 1409 | FILE *fp; |
9f19cc17 | 1410 | struct lttng_event *elist; |
2ef84c95 | 1411 | |
a0377dfe | 1412 | LTTNG_ASSERT(events); |
0525e9ae | 1413 | |
7d268848 | 1414 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1415 | if (fd < 0) { |
df0f840b | 1416 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1417 | goto error; |
1418 | } | |
1419 | ||
1420 | fp = fdopen(fd, "r"); | |
cd9adb8b | 1421 | if (fp == nullptr) { |
df0f840b | 1422 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1423 | goto error_fp; |
2ef84c95 DG |
1424 | } |
1425 | ||
1426 | /* | |
1427 | * Init memory size counter | |
1428 | * See kernel-ctl.h for explanation of this value | |
1429 | */ | |
6725fe19 | 1430 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
64803277 | 1431 | elist = calloc<lttng_event>(nbmem); |
cd9adb8b | 1432 | if (elist == nullptr) { |
3b870559 MD |
1433 | PERROR("alloc list events"); |
1434 | count = -ENOMEM; | |
1435 | goto end; | |
1436 | } | |
2ef84c95 | 1437 | |
53efb85a | 1438 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1439 | if (count >= nbmem) { |
3b870559 | 1440 | struct lttng_event *new_elist; |
53efb85a | 1441 | size_t new_nbmem; |
3b870559 | 1442 | |
53efb85a | 1443 | new_nbmem = nbmem << 1; |
28ab034a JG |
1444 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, new_nbmem); |
1445 | new_elist = (lttng_event *) realloc(elist, | |
1446 | new_nbmem * sizeof(struct lttng_event)); | |
cd9adb8b | 1447 | if (new_elist == nullptr) { |
df0f840b | 1448 | PERROR("realloc list events"); |
3b870559 MD |
1449 | free(event); |
1450 | free(elist); | |
61b73b12 MD |
1451 | count = -ENOMEM; |
1452 | goto end; | |
2ef84c95 | 1453 | } |
53efb85a | 1454 | /* Zero the new memory */ |
28ab034a JG |
1455 | memset(new_elist + nbmem, |
1456 | 0, | |
1457 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
53efb85a | 1458 | nbmem = new_nbmem; |
3b870559 | 1459 | elist = new_elist; |
2ef84c95 | 1460 | } |
99497cd0 MD |
1461 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1462 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1463 | elist[count].enabled = -1; |
9f19cc17 | 1464 | count++; |
3b870559 | 1465 | free(event); |
2ef84c95 DG |
1466 | } |
1467 | ||
9f19cc17 | 1468 | *events = elist; |
ced2f820 | 1469 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1470 | end: |
28ab034a | 1471 | ret = fclose(fp); /* closes both fp and fd */ |
799e2c4f MD |
1472 | if (ret) { |
1473 | PERROR("fclose"); | |
1474 | } | |
9f19cc17 | 1475 | return count; |
2ef84c95 | 1476 | |
61b73b12 | 1477 | error_fp: |
799e2c4f MD |
1478 | ret = close(fd); |
1479 | if (ret) { | |
1480 | PERROR("close"); | |
1481 | } | |
2ef84c95 DG |
1482 | error: |
1483 | return -1; | |
1484 | } | |
096102bd DG |
1485 | |
1486 | /* | |
1487 | * Get kernel version and validate it. | |
1488 | */ | |
b8e2fb80 | 1489 | int kernel_validate_version(struct lttng_kernel_abi_tracer_version *version, |
28ab034a | 1490 | struct lttng_kernel_abi_tracer_abi_version *abi_version) |
096102bd DG |
1491 | { |
1492 | int ret; | |
096102bd | 1493 | |
7d268848 | 1494 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1495 | if (ret < 0) { |
521dd134 | 1496 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1497 | goto error; |
1498 | } | |
1499 | ||
1500 | /* Validate version */ | |
88076e89 | 1501 | if (version->major != VERSION_MAJOR) { |
c052142c | 1502 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
28ab034a JG |
1503 | version->major, |
1504 | VERSION_MAJOR); | |
096102bd | 1505 | goto error_version; |
096102bd | 1506 | } |
7d268848 | 1507 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1508 | if (ret < 0) { |
521dd134 | 1509 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1510 | goto error; |
1511 | } | |
b8e2fb80 | 1512 | if (abi_version->major != LTTNG_KERNEL_ABI_MAJOR_VERSION) { |
521dd134 | 1513 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
28ab034a JG |
1514 | abi_version->major, |
1515 | abi_version->minor, | |
1516 | LTTNG_KERNEL_ABI_MAJOR_VERSION); | |
c052142c MD |
1517 | goto error; |
1518 | } | |
1519 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
28ab034a JG |
1520 | version->major, |
1521 | version->minor, | |
1522 | abi_version->major, | |
1523 | abi_version->minor); | |
096102bd DG |
1524 | return 0; |
1525 | ||
1526 | error_version: | |
096102bd DG |
1527 | ret = -1; |
1528 | ||
1529 | error: | |
521dd134 | 1530 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1531 | return ret; |
1532 | } | |
335a95b7 MD |
1533 | |
1534 | /* | |
1535 | * Kernel work-arounds called at the start of sessiond main(). | |
1536 | */ | |
cd9adb8b | 1537 | int init_kernel_workarounds() |
335a95b7 | 1538 | { |
8936c33a | 1539 | int ret; |
335a95b7 MD |
1540 | FILE *fp; |
1541 | ||
1542 | /* | |
1543 | * boot_id needs to be read once before being used concurrently | |
1544 | * to deal with a Linux kernel race. A fix is proposed for | |
1545 | * upstream, but the work-around is needed for older kernels. | |
1546 | */ | |
1547 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1548 | if (!fp) { | |
1549 | goto end_boot_id; | |
1550 | } | |
1551 | while (!feof(fp)) { | |
1552 | char buf[37] = ""; | |
1553 | ||
8936c33a DG |
1554 | ret = fread(buf, 1, sizeof(buf), fp); |
1555 | if (ret < 0) { | |
1556 | /* Ignore error, we don't really care */ | |
1557 | } | |
335a95b7 | 1558 | } |
799e2c4f MD |
1559 | ret = fclose(fp); |
1560 | if (ret) { | |
1561 | PERROR("fclose"); | |
1562 | } | |
335a95b7 | 1563 | end_boot_id: |
335a95b7 MD |
1564 | return 0; |
1565 | } | |
2f77fc4b DG |
1566 | |
1567 | /* | |
d070c424 | 1568 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1569 | */ |
1570 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1571 | { | |
82b69413 JG |
1572 | struct lttng_trace_chunk *trace_chunk; |
1573 | ||
cd9adb8b | 1574 | if (ksess == nullptr) { |
2f77fc4b DG |
1575 | DBG3("No kernel session when tearing down session"); |
1576 | return; | |
1577 | } | |
1578 | ||
1579 | DBG("Tearing down kernel session"); | |
82b69413 | 1580 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1581 | |
07b86b52 | 1582 | /* |
15dc512a DG |
1583 | * Destroy channels on the consumer if at least one FD has been sent and we |
1584 | * are in no output mode because the streams are in *no* monitor mode so we | |
1585 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1586 | */ |
15dc512a | 1587 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1588 | int ret; |
1589 | struct consumer_socket *socket; | |
1590 | struct lttng_ht_iter iter; | |
1591 | ||
1592 | /* For each consumer socket. */ | |
d069d577 | 1593 | rcu_read_lock(); |
28ab034a JG |
1594 | cds_lfht_for_each_entry ( |
1595 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
07b86b52 JD |
1596 | struct ltt_kernel_channel *chan; |
1597 | ||
1598 | /* For each channel, ask the consumer to destroy it. */ | |
28ab034a | 1599 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
07b86b52 JD |
1600 | ret = kernel_consumer_destroy_channel(socket, chan); |
1601 | if (ret < 0) { | |
1602 | /* Consumer is probably dead. Use next socket. */ | |
1603 | continue; | |
1604 | } | |
1605 | } | |
1606 | } | |
d069d577 | 1607 | rcu_read_unlock(); |
07b86b52 JD |
1608 | } |
1609 | ||
2f77fc4b DG |
1610 | /* Close any relayd session */ |
1611 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1612 | ||
1613 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1614 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1615 | } |
fb5f35b6 | 1616 | |
d070c424 MD |
1617 | /* Teardown of data required by destroy notifiers. */ |
1618 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1619 | { | |
cd9adb8b | 1620 | if (ksess == nullptr) { |
d070c424 MD |
1621 | return; |
1622 | } | |
1623 | trace_kernel_free_session(ksess); | |
1624 | } | |
1625 | ||
fb5f35b6 DG |
1626 | /* |
1627 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1628 | */ | |
1629 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1630 | { | |
cd9adb8b | 1631 | struct ltt_kernel_session *ksess = nullptr; |
fb5f35b6 | 1632 | |
a0377dfe FD |
1633 | LTTNG_ASSERT(kchan); |
1634 | LTTNG_ASSERT(kchan->channel); | |
fb5f35b6 DG |
1635 | |
1636 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1637 | ||
1638 | /* Update channel count of associated session. */ | |
1639 | if (kchan->session) { | |
1640 | /* Keep pointer reference so we can update it after the destroy. */ | |
1641 | ksess = kchan->session; | |
1642 | } | |
1643 | ||
1644 | trace_kernel_destroy_channel(kchan); | |
1645 | ||
1646 | /* | |
1647 | * At this point the kernel channel is not visible anymore. This is safe | |
1648 | * since in order to work on a visible kernel session, the tracing session | |
1649 | * lock (ltt_session.lock) MUST be acquired. | |
1650 | */ | |
1651 | if (ksess) { | |
1652 | ksess->channel_count--; | |
1653 | } | |
1654 | } | |
6dc3064a DG |
1655 | |
1656 | /* | |
1657 | * Take a snapshot for a given kernel session. | |
1658 | * | |
9a654598 | 1659 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1660 | */ |
28ab034a JG |
1661 | enum lttng_error_code kernel_snapshot_record(struct ltt_kernel_session *ksess, |
1662 | const struct consumer_output *output, | |
1663 | uint64_t nb_packets_per_stream) | |
6dc3064a | 1664 | { |
2a06df8d | 1665 | int err, ret, saved_metadata_fd; |
9a654598 | 1666 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1667 | struct consumer_socket *socket; |
1668 | struct lttng_ht_iter iter; | |
1669 | struct ltt_kernel_metadata *saved_metadata; | |
cd9adb8b | 1670 | char *trace_path = nullptr; |
5da88b0f | 1671 | size_t consumer_path_offset = 0; |
6dc3064a | 1672 | |
a0377dfe FD |
1673 | LTTNG_ASSERT(ksess); |
1674 | LTTNG_ASSERT(ksess->consumer); | |
1675 | LTTNG_ASSERT(output); | |
6dc3064a DG |
1676 | |
1677 | DBG("Kernel snapshot record started"); | |
1678 | ||
1679 | /* Save current metadata since the following calls will change it. */ | |
1680 | saved_metadata = ksess->metadata; | |
1681 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1682 | ||
1683 | rcu_read_lock(); | |
1684 | ||
1685 | ret = kernel_open_metadata(ksess); | |
1686 | if (ret < 0) { | |
9a654598 | 1687 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1688 | goto error; |
1689 | } | |
1690 | ||
1691 | ret = kernel_open_metadata_stream(ksess); | |
1692 | if (ret < 0) { | |
9a654598 | 1693 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1694 | goto error_open_stream; |
1695 | } | |
1696 | ||
28ab034a | 1697 | trace_path = setup_channel_trace_path(ksess->consumer, "", &consumer_path_offset); |
3b967712 MD |
1698 | if (!trace_path) { |
1699 | status = LTTNG_ERR_INVALID; | |
1700 | goto error; | |
1701 | } | |
6dc3064a | 1702 | /* Send metadata to consumer and snapshot everything. */ |
28ab034a | 1703 | cds_lfht_for_each_entry (output->socks->ht, &iter.iter, socket, node.node) { |
6dc3064a | 1704 | struct ltt_kernel_channel *chan; |
6dc3064a | 1705 | |
6dc3064a DG |
1706 | pthread_mutex_lock(socket->lock); |
1707 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1708 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1709 | pthread_mutex_unlock(socket->lock); |
6dc3064a | 1710 | if (ret < 0) { |
0ed78e50 | 1711 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1712 | goto error_consumer; |
1713 | } | |
1714 | ||
1715 | /* For each channel, ask the consumer to snapshot it. */ | |
28ab034a JG |
1716 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
1717 | status = consumer_snapshot_channel(socket, | |
1718 | chan->key, | |
1719 | output, | |
1720 | 0, | |
1721 | &trace_path[consumer_path_offset], | |
1722 | nb_packets_per_stream); | |
9a654598 | 1723 | if (status != LTTNG_OK) { |
28ab034a | 1724 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); |
6dc3064a DG |
1725 | goto error_consumer; |
1726 | } | |
1727 | } | |
1728 | ||
1729 | /* Snapshot metadata, */ | |
28ab034a JG |
1730 | status = consumer_snapshot_channel(socket, |
1731 | ksess->metadata->key, | |
1732 | output, | |
1733 | 1, | |
1734 | &trace_path[consumer_path_offset], | |
1735 | 0); | |
9a654598 | 1736 | if (status != LTTNG_OK) { |
6dc3064a DG |
1737 | goto error_consumer; |
1738 | } | |
07b86b52 JD |
1739 | |
1740 | /* | |
1741 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1742 | * it's not monitored on the consumer side. | |
1743 | */ | |
1744 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1745 | } |
1746 | ||
1747 | error_consumer: | |
1748 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1749 | err = close(ksess->metadata_stream_fd); |
1750 | if (err < 0) { | |
6dc3064a DG |
1751 | PERROR("close snapshot kernel"); |
1752 | } | |
1753 | ||
1754 | error_open_stream: | |
1755 | trace_kernel_destroy_metadata(ksess->metadata); | |
1756 | error: | |
1757 | /* Restore metadata state.*/ | |
1758 | ksess->metadata = saved_metadata; | |
1759 | ksess->metadata_stream_fd = saved_metadata_fd; | |
6dc3064a | 1760 | rcu_read_unlock(); |
3b967712 | 1761 | free(trace_path); |
9a654598 | 1762 | return status; |
6dc3064a | 1763 | } |
834978fd DG |
1764 | |
1765 | /* | |
1766 | * Get the syscall mask array from the kernel tracer. | |
1767 | * | |
1768 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1769 | * be freed. | |
1770 | */ | |
1771 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1772 | { | |
a0377dfe FD |
1773 | LTTNG_ASSERT(syscall_mask); |
1774 | LTTNG_ASSERT(nr_bits); | |
834978fd DG |
1775 | |
1776 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1777 | } | |
6e21424e | 1778 | |
28ab034a | 1779 | static int kernel_tracer_abi_greater_or_equal(unsigned int major, unsigned int minor) |
6e21424e | 1780 | { |
959e3c66 | 1781 | int ret; |
b8e2fb80 | 1782 | struct lttng_kernel_abi_tracer_abi_version abi; |
6e21424e | 1783 | |
7d268848 | 1784 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1785 | if (ret < 0) { |
1786 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1787 | goto error; | |
1788 | } | |
1789 | ||
959e3c66 JR |
1790 | ret = abi.major > major || (abi.major == major && abi.minor >= minor); |
1791 | error: | |
1792 | return ret; | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1797 | * version number. | |
1798 | * | |
1799 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1800 | * of errors. | |
1801 | */ | |
cd9adb8b | 1802 | int kernel_supports_ring_buffer_snapshot_sample_positions() |
959e3c66 | 1803 | { |
6e21424e JR |
1804 | /* |
1805 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1806 | */ | |
959e3c66 | 1807 | return kernel_tracer_abi_greater_or_equal(2, 3); |
6e21424e | 1808 | } |
5c408ad8 | 1809 | |
a40a503f MD |
1810 | /* |
1811 | * Check for the support of the packet sequence number via abi version number. | |
1812 | * | |
1813 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1814 | * of errors. | |
1815 | */ | |
cd9adb8b | 1816 | int kernel_supports_ring_buffer_packet_sequence_number() |
a40a503f | 1817 | { |
a40a503f | 1818 | /* |
3029bc92 JG |
1819 | * Packet sequence number was introduced in LTTng 2.8, |
1820 | * lttng-modules ABI 2.1. | |
a40a503f | 1821 | */ |
959e3c66 JR |
1822 | return kernel_tracer_abi_greater_or_equal(2, 1); |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Check for the support of event notifiers via abi version number. | |
1827 | * | |
1828 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1829 | * of errors. | |
1830 | */ | |
cd9adb8b | 1831 | int kernel_supports_event_notifiers() |
959e3c66 JR |
1832 | { |
1833 | /* | |
1834 | * Event notifiers were introduced in LTTng 2.13, lttng-modules ABI 2.6. | |
1835 | */ | |
1836 | return kernel_tracer_abi_greater_or_equal(2, 6); | |
a40a503f MD |
1837 | } |
1838 | ||
5c408ad8 JD |
1839 | /* |
1840 | * Rotate a kernel session. | |
1841 | * | |
d5a1b7aa | 1842 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1843 | */ |
d5a1b7aa | 1844 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1845 | { |
1846 | int ret; | |
d5a1b7aa | 1847 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1848 | struct consumer_socket *socket; |
1849 | struct lttng_ht_iter iter; | |
1850 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1851 | ||
a0377dfe FD |
1852 | LTTNG_ASSERT(ksess); |
1853 | LTTNG_ASSERT(ksess->consumer); | |
5c408ad8 | 1854 | |
28ab034a | 1855 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", session->name, session->id); |
5c408ad8 JD |
1856 | |
1857 | rcu_read_lock(); | |
1858 | ||
1859 | /* | |
1860 | * Note that this loop will end after one iteration given that there is | |
1861 | * only one kernel consumer. | |
1862 | */ | |
28ab034a | 1863 | cds_lfht_for_each_entry (ksess->consumer->socks->ht, &iter.iter, socket, node.node) { |
5c408ad8 JD |
1864 | struct ltt_kernel_channel *chan; |
1865 | ||
b8a1b0bd | 1866 | /* For each channel, ask the consumer to rotate it. */ |
28ab034a | 1867 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
92816cc3 | 1868 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
28ab034a JG |
1869 | chan->key, |
1870 | session->name); | |
1871 | ret = consumer_rotate_channel(socket, | |
1872 | chan->key, | |
1873 | ksess->consumer, | |
1874 | /* is_metadata_channel */ false); | |
5c408ad8 | 1875 | if (ret < 0) { |
7e0de219 | 1876 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1877 | goto error; |
1878 | } | |
1879 | } | |
1880 | ||
1881 | /* | |
1882 | * Rotate the metadata channel. | |
1883 | */ | |
28ab034a JG |
1884 | ret = consumer_rotate_channel(socket, |
1885 | ksess->metadata->key, | |
1886 | ksess->consumer, | |
1887 | /* is_metadata_channel */ true); | |
5c408ad8 | 1888 | if (ret < 0) { |
7e0de219 | 1889 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1890 | goto error; |
1891 | } | |
1892 | } | |
1893 | ||
5c408ad8 JD |
1894 | error: |
1895 | rcu_read_unlock(); | |
d5a1b7aa | 1896 | return status; |
5c408ad8 | 1897 | } |
d2956687 | 1898 | |
28ab034a | 1899 | enum lttng_error_code kernel_create_channel_subdirectories(const struct ltt_kernel_session *ksess) |
d2956687 JG |
1900 | { |
1901 | enum lttng_error_code ret = LTTNG_OK; | |
1902 | enum lttng_trace_chunk_status chunk_status; | |
1903 | ||
1904 | rcu_read_lock(); | |
a0377dfe | 1905 | LTTNG_ASSERT(ksess->current_trace_chunk); |
d2956687 JG |
1906 | |
1907 | /* | |
1908 | * Create the index subdirectory which will take care | |
1909 | * of implicitly creating the channel's path. | |
1910 | */ | |
1911 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
28ab034a | 1912 | ksess->current_trace_chunk, DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); |
d2956687 JG |
1913 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
1914 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1915 | goto error; | |
1916 | } | |
1917 | error: | |
1918 | rcu_read_unlock(); | |
1919 | return ret; | |
1920 | } | |
7d268848 MD |
1921 | |
1922 | /* | |
1923 | * Setup necessary data for kernel tracer action. | |
1924 | */ | |
cd9adb8b | 1925 | int init_kernel_tracer() |
7d268848 MD |
1926 | { |
1927 | int ret; | |
1928 | bool is_root = !getuid(); | |
1929 | ||
1930 | /* Modprobe lttng kernel modules */ | |
1931 | ret = modprobe_lttng_control(); | |
1932 | if (ret < 0) { | |
1933 | goto error; | |
1934 | } | |
1935 | ||
1936 | /* Open debugfs lttng */ | |
1937 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1938 | if (kernel_tracer_fd < 0) { | |
1939 | DBG("Failed to open %s", module_proc_lttng); | |
1940 | goto error_open; | |
1941 | } | |
1942 | ||
1943 | /* Validate kernel version */ | |
28ab034a | 1944 | ret = kernel_validate_version(&the_kernel_tracer_version, &the_kernel_tracer_abi_version); |
7d268848 MD |
1945 | if (ret < 0) { |
1946 | goto error_version; | |
1947 | } | |
1948 | ||
1949 | ret = modprobe_lttng_data(); | |
1950 | if (ret < 0) { | |
1951 | goto error_modules; | |
1952 | } | |
1953 | ||
1954 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1955 | if (ret < 0) { | |
1956 | goto error_modules; | |
1957 | } | |
7d268848 MD |
1958 | if (ret < 1) { |
1959 | WARN("Kernel tracer does not support buffer monitoring. " | |
28ab034a JG |
1960 | "The monitoring timer of channels in the kernel domain " |
1961 | "will be set to 0 (disabled)."); | |
7d268848 MD |
1962 | } |
1963 | ||
352b58f5 JR |
1964 | ret = kernel_supports_event_notifiers(); |
1965 | if (ret < 0) { | |
1966 | ERR("Failed to check for kernel tracer event notifier support"); | |
1967 | goto error_modules; | |
1968 | } | |
1969 | ret = kernel_create_event_notifier_group(&kernel_tracer_event_notifier_group_fd); | |
1970 | if (ret < 0) { | |
1971 | /* This is not fatal. */ | |
1972 | WARN("Failed to create kernel event notifier group"); | |
1973 | kernel_tracer_event_notifier_group_fd = -1; | |
1974 | } else { | |
90aa04a1 FD |
1975 | enum event_notifier_error_accounting_status error_accounting_status; |
1976 | enum lttng_error_code error_code_ret = | |
28ab034a JG |
1977 | kernel_create_event_notifier_group_notification_fd( |
1978 | &kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
1979 | |
1980 | if (error_code_ret != LTTNG_OK) { | |
1981 | goto error_modules; | |
1982 | } | |
1983 | ||
90aa04a1 | 1984 | error_accounting_status = event_notifier_error_accounting_register_kernel( |
28ab034a | 1985 | kernel_tracer_event_notifier_group_fd); |
90aa04a1 FD |
1986 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
1987 | ERR("Failed to initialize event notifier error accounting for kernel tracer"); | |
1988 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING; | |
1989 | goto error_modules; | |
1990 | } | |
1991 | ||
352b58f5 | 1992 | kernel_token_to_event_notifier_rule_ht = cds_lfht_new( |
cd9adb8b | 1993 | DEFAULT_HT_SIZE, 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, nullptr); |
352b58f5 JR |
1994 | if (!kernel_token_to_event_notifier_rule_ht) { |
1995 | goto error_token_ht; | |
1996 | } | |
1997 | } | |
1998 | ||
1999 | DBG("Kernel tracer initialized: kernel tracer fd = %d, event notifier group fd = %d, event notifier group notification fd = %d", | |
28ab034a JG |
2000 | kernel_tracer_fd, |
2001 | kernel_tracer_event_notifier_group_fd, | |
2002 | kernel_tracer_event_notifier_group_notification_fd); | |
7d268848 MD |
2003 | |
2004 | ret = syscall_init_table(kernel_tracer_fd); | |
2005 | if (ret < 0) { | |
2006 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
28ab034a | 2007 | "work for this session daemon."); |
7d268848 | 2008 | } |
352b58f5 | 2009 | |
7d268848 MD |
2010 | return 0; |
2011 | ||
2012 | error_version: | |
2013 | modprobe_remove_lttng_control(); | |
2014 | ret = close(kernel_tracer_fd); | |
2015 | if (ret) { | |
28ab034a | 2016 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 | 2017 | } |
6dcf80d3 | 2018 | |
7d268848 MD |
2019 | kernel_tracer_fd = -1; |
2020 | return LTTNG_ERR_KERN_VERSION; | |
2021 | ||
352b58f5 JR |
2022 | error_token_ht: |
2023 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2024 | if (ret) { | |
2025 | PERROR("Failed to close kernel tracer event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2026 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2027 | } |
2028 | ||
6dcf80d3 JG |
2029 | kernel_tracer_event_notifier_group_notification_fd = -1; |
2030 | ||
7d268848 | 2031 | error_modules: |
352b58f5 JR |
2032 | ret = close(kernel_tracer_event_notifier_group_fd); |
2033 | if (ret) { | |
2034 | PERROR("Failed to close kernel tracer event notifier group file descriptor: fd = %d", | |
28ab034a | 2035 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2036 | } |
2037 | ||
6dcf80d3 JG |
2038 | kernel_tracer_event_notifier_group_fd = -1; |
2039 | ||
7d268848 MD |
2040 | ret = close(kernel_tracer_fd); |
2041 | if (ret) { | |
28ab034a | 2042 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 MD |
2043 | } |
2044 | ||
6dcf80d3 JG |
2045 | kernel_tracer_fd = -1; |
2046 | ||
7d268848 MD |
2047 | error_open: |
2048 | modprobe_remove_lttng_control(); | |
2049 | ||
2050 | error: | |
2051 | WARN("No kernel tracer available"); | |
2052 | kernel_tracer_fd = -1; | |
2053 | if (!is_root) { | |
2054 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2055 | } else { | |
2056 | return LTTNG_ERR_KERN_NA; | |
2057 | } | |
2058 | } | |
2059 | ||
cd9adb8b | 2060 | void cleanup_kernel_tracer() |
7d268848 | 2061 | { |
352b58f5 JR |
2062 | DBG2("Closing kernel event notifier group notification file descriptor"); |
2063 | if (kernel_tracer_event_notifier_group_notification_fd >= 0) { | |
b69a1b40 | 2064 | int ret = notification_thread_command_remove_tracer_event_source( |
28ab034a JG |
2065 | the_notification_thread_handle, |
2066 | kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
2067 | if (ret != LTTNG_OK) { |
2068 | ERR("Failed to remove kernel event notifier notification from notification thread"); | |
2069 | } | |
2070 | ||
2071 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2072 | if (ret) { | |
2073 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2074 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2075 | } |
2076 | ||
2077 | kernel_tracer_event_notifier_group_notification_fd = -1; | |
2078 | } | |
2079 | ||
2080 | if (kernel_token_to_event_notifier_rule_ht) { | |
cd9adb8b | 2081 | const int ret = cds_lfht_destroy(kernel_token_to_event_notifier_rule_ht, nullptr); |
a0377dfe | 2082 | LTTNG_ASSERT(ret == 0); |
352b58f5 JR |
2083 | } |
2084 | ||
2085 | DBG2("Closing kernel event notifier group file descriptor"); | |
2086 | if (kernel_tracer_event_notifier_group_fd >= 0) { | |
b69a1b40 JG |
2087 | const int ret = close(kernel_tracer_event_notifier_group_fd); |
2088 | ||
352b58f5 JR |
2089 | if (ret) { |
2090 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 2091 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2092 | } |
2093 | ||
2094 | kernel_tracer_event_notifier_group_fd = -1; | |
2095 | } | |
7d268848 MD |
2096 | |
2097 | DBG2("Closing kernel fd"); | |
2098 | if (kernel_tracer_fd >= 0) { | |
b69a1b40 JG |
2099 | const int ret = close(kernel_tracer_fd); |
2100 | ||
7d268848 | 2101 | if (ret) { |
352b58f5 | 2102 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
28ab034a | 2103 | kernel_tracer_fd); |
7d268848 | 2104 | } |
352b58f5 | 2105 | |
7d268848 MD |
2106 | kernel_tracer_fd = -1; |
2107 | } | |
352b58f5 | 2108 | |
7d268848 MD |
2109 | free(syscall_table); |
2110 | } | |
2111 | ||
cd9adb8b | 2112 | bool kernel_tracer_is_initialized() |
7d268848 MD |
2113 | { |
2114 | return kernel_tracer_fd >= 0; | |
2115 | } | |
bca212a2 MD |
2116 | |
2117 | /* | |
2118 | * Clear a kernel session. | |
2119 | * | |
2120 | * Return LTTNG_OK on success or else an LTTng error code. | |
2121 | */ | |
2122 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2123 | { | |
2124 | int ret; | |
2125 | enum lttng_error_code status = LTTNG_OK; | |
2126 | struct consumer_socket *socket; | |
2127 | struct lttng_ht_iter iter; | |
2128 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2129 | ||
a0377dfe FD |
2130 | LTTNG_ASSERT(ksess); |
2131 | LTTNG_ASSERT(ksess->consumer); | |
bca212a2 | 2132 | |
28ab034a | 2133 | DBG("Clear kernel session %s (session %" PRIu64 ")", session->name, session->id); |
bca212a2 MD |
2134 | |
2135 | rcu_read_lock(); | |
2136 | ||
2137 | if (ksess->active) { | |
2138 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2139 | status = LTTNG_ERR_FATAL; | |
2140 | goto end; | |
2141 | } | |
2142 | ||
2143 | /* | |
2144 | * Note that this loop will end after one iteration given that there is | |
2145 | * only one kernel consumer. | |
2146 | */ | |
28ab034a | 2147 | cds_lfht_for_each_entry (ksess->consumer->socks->ht, &iter.iter, socket, node.node) { |
bca212a2 MD |
2148 | struct ltt_kernel_channel *chan; |
2149 | ||
2150 | /* For each channel, ask the consumer to clear it. */ | |
28ab034a | 2151 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
bca212a2 | 2152 | DBG("Clear kernel channel %" PRIu64 ", session %s", |
28ab034a JG |
2153 | chan->key, |
2154 | session->name); | |
bca212a2 MD |
2155 | ret = consumer_clear_channel(socket, chan->key); |
2156 | if (ret < 0) { | |
2157 | goto error; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | if (!ksess->metadata) { | |
2162 | /* | |
2163 | * Nothing to do for the metadata. | |
2164 | * This is a snapshot session. | |
2165 | * The metadata is genererated on the fly. | |
2166 | */ | |
2167 | continue; | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * Clear the metadata channel. | |
2172 | * Metadata channel is not cleared per se but we still need to | |
2173 | * perform a rotation operation on it behind the scene. | |
2174 | */ | |
2175 | ret = consumer_clear_channel(socket, ksess->metadata->key); | |
2176 | if (ret < 0) { | |
2177 | goto error; | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | goto end; | |
2182 | error: | |
2183 | switch (-ret) { | |
2184 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
28ab034a JG |
2185 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; |
2186 | break; | |
bca212a2 | 2187 | default: |
28ab034a JG |
2188 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; |
2189 | break; | |
bca212a2 MD |
2190 | } |
2191 | end: | |
2192 | rcu_read_unlock(); | |
2193 | return status; | |
2194 | } | |
352b58f5 | 2195 | |
28ab034a JG |
2196 | enum lttng_error_code |
2197 | kernel_create_event_notifier_group_notification_fd(int *event_notifier_group_notification_fd) | |
352b58f5 JR |
2198 | { |
2199 | int local_fd = -1, ret; | |
2200 | enum lttng_error_code error_code_ret; | |
2201 | ||
a0377dfe | 2202 | LTTNG_ASSERT(event_notifier_group_notification_fd); |
352b58f5 JR |
2203 | |
2204 | ret = kernctl_create_event_notifier_group_notification_fd( | |
28ab034a | 2205 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2206 | if (ret < 0) { |
2207 | PERROR("Failed to create kernel event notifier group notification file descriptor"); | |
2208 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2209 | goto error; | |
2210 | } | |
2211 | ||
2212 | local_fd = ret; | |
2213 | ||
2214 | /* Prevent fd duplication after execlp(). */ | |
2215 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2216 | if (ret < 0) { | |
2217 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2218 | local_fd); |
352b58f5 JR |
2219 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; |
2220 | goto error; | |
2221 | } | |
2222 | ||
28ab034a | 2223 | DBG("Created kernel notifier group notification file descriptor: fd = %d", local_fd); |
352b58f5 JR |
2224 | error_code_ret = LTTNG_OK; |
2225 | *event_notifier_group_notification_fd = local_fd; | |
2226 | local_fd = -1; | |
2227 | ||
2228 | error: | |
2229 | if (local_fd >= 0) { | |
2230 | ret = close(local_fd); | |
2231 | if (ret) { | |
2232 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2233 | local_fd); |
352b58f5 JR |
2234 | } |
2235 | } | |
2236 | ||
2237 | return error_code_ret; | |
2238 | } | |
2239 | ||
28ab034a JG |
2240 | enum lttng_error_code |
2241 | kernel_destroy_event_notifier_group_notification_fd(int event_notifier_group_notification_fd) | |
352b58f5 JR |
2242 | { |
2243 | enum lttng_error_code ret_code = LTTNG_OK; | |
2244 | ||
2245 | DBG("Closing event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2246 | event_notifier_group_notification_fd); |
352b58f5 JR |
2247 | if (event_notifier_group_notification_fd >= 0) { |
2248 | const int ret = close(event_notifier_group_notification_fd); | |
2249 | if (ret) { | |
2250 | PERROR("Failed to close event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2251 | event_notifier_group_notification_fd); |
352b58f5 JR |
2252 | } |
2253 | } | |
2254 | ||
2255 | return ret_code; | |
2256 | } | |
2257 | ||
28ab034a | 2258 | static unsigned long hash_trigger(const struct lttng_trigger *trigger) |
352b58f5 | 2259 | { |
28ab034a | 2260 | const struct lttng_condition *condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2261 | |
2262 | return lttng_condition_hash(condition); | |
2263 | } | |
2264 | ||
28ab034a | 2265 | static int match_trigger(struct cds_lfht_node *node, const void *key) |
352b58f5 JR |
2266 | { |
2267 | const struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
7966af57 | 2268 | const struct lttng_trigger *trigger = (lttng_trigger *) key; |
352b58f5 | 2269 | |
28ab034a JG |
2270 | event_notifier_rule = |
2271 | caa_container_of(node, const struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2272 | |
2273 | return lttng_trigger_is_equal(trigger, event_notifier_rule->trigger); | |
2274 | } | |
2275 | ||
2276 | static enum lttng_error_code kernel_create_event_notifier_rule( | |
28ab034a | 2277 | struct lttng_trigger *trigger, const struct lttng_credentials *creds, uint64_t token) |
352b58f5 JR |
2278 | { |
2279 | int err, fd, ret = 0; | |
2280 | enum lttng_error_code error_code_ret; | |
2281 | enum lttng_condition_status condition_status; | |
2282 | enum lttng_condition_type condition_type; | |
2283 | enum lttng_event_rule_type event_rule_type; | |
2284 | struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
b8e2fb80 | 2285 | struct lttng_kernel_abi_event_notifier kernel_event_notifier = {}; |
bbd6675c | 2286 | unsigned int capture_bytecode_count = 0, i; |
cd9adb8b JG |
2287 | const struct lttng_condition *condition = nullptr; |
2288 | const struct lttng_event_rule *event_rule = nullptr; | |
bbd6675c | 2289 | enum lttng_condition_status cond_status; |
352b58f5 | 2290 | |
a0377dfe | 2291 | LTTNG_ASSERT(trigger); |
352b58f5 JR |
2292 | |
2293 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 2294 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2295 | |
2296 | condition_type = lttng_condition_get_type(condition); | |
a0377dfe | 2297 | LTTNG_ASSERT(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
352b58f5 JR |
2298 | |
2299 | /* Does not acquire a reference. */ | |
28ab034a | 2300 | condition_status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe FD |
2301 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
2302 | LTTNG_ASSERT(event_rule); | |
352b58f5 JR |
2303 | |
2304 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
a0377dfe | 2305 | LTTNG_ASSERT(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); |
352b58f5 | 2306 | |
28ab034a JG |
2307 | error_code_ret = trace_kernel_create_event_notifier_rule( |
2308 | trigger, | |
2309 | token, | |
2310 | lttng_condition_event_rule_matches_get_error_counter_index(condition), | |
2311 | &event_notifier_rule); | |
352b58f5 JR |
2312 | if (error_code_ret != LTTNG_OK) { |
2313 | goto error; | |
2314 | } | |
2315 | ||
28ab034a JG |
2316 | error_code_ret = trace_kernel_init_event_notifier_from_event_rule(event_rule, |
2317 | &kernel_event_notifier); | |
352b58f5 | 2318 | if (error_code_ret != LTTNG_OK) { |
b5e3b044 | 2319 | goto free_event; |
352b58f5 JR |
2320 | } |
2321 | ||
2322 | kernel_event_notifier.event.token = event_notifier_rule->token; | |
90aa04a1 | 2323 | kernel_event_notifier.error_counter_idx = |
28ab034a | 2324 | lttng_condition_event_rule_matches_get_error_counter_index(condition); |
352b58f5 | 2325 | |
28ab034a JG |
2326 | fd = kernctl_create_event_notifier(kernel_tracer_event_notifier_group_fd, |
2327 | &kernel_event_notifier); | |
352b58f5 JR |
2328 | if (fd < 0) { |
2329 | switch (-fd) { | |
2330 | case EEXIST: | |
2331 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2332 | break; | |
2333 | case ENOSYS: | |
2334 | WARN("Failed to create kernel event notifier: not notifier type not implemented"); | |
2335 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2336 | break; | |
2337 | case ENOENT: | |
2338 | WARN("Failed to create kernel event notifier: not found: name = '%s'", | |
28ab034a | 2339 | kernel_event_notifier.event.name); |
352b58f5 JR |
2340 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2341 | break; | |
2342 | default: | |
2343 | PERROR("Failed to create kernel event notifier: error code = %d, name = '%s'", | |
28ab034a JG |
2344 | fd, |
2345 | kernel_event_notifier.event.name); | |
352b58f5 JR |
2346 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2347 | } | |
2348 | goto free_event; | |
2349 | } | |
2350 | ||
2351 | event_notifier_rule->fd = fd; | |
2352 | /* Prevent fd duplication after execlp(). */ | |
2353 | err = fcntl(event_notifier_rule->fd, F_SETFD, FD_CLOEXEC); | |
2354 | if (err < 0) { | |
2355 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier file descriptor: fd = %d", | |
28ab034a | 2356 | fd); |
352b58f5 JR |
2357 | error_code_ret = LTTNG_ERR_FATAL; |
2358 | goto set_cloexec_error; | |
2359 | } | |
2360 | ||
2361 | if (event_notifier_rule->filter) { | |
2362 | err = kernctl_filter(event_notifier_rule->fd, event_notifier_rule->filter); | |
2363 | if (err < 0) { | |
2364 | switch (-err) { | |
2365 | case ENOMEM: | |
2366 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2367 | break; | |
2368 | default: | |
2369 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2370 | break; | |
2371 | } | |
2372 | goto filter_error; | |
2373 | } | |
2374 | } | |
2375 | ||
28ab034a | 2376 | if (lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) { |
352b58f5 | 2377 | ret = userspace_probe_event_rule_add_callsites( |
28ab034a | 2378 | event_rule, creds, event_notifier_rule->fd); |
352b58f5 JR |
2379 | if (ret) { |
2380 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2381 | goto add_callsite_error; | |
2382 | } | |
2383 | } | |
2384 | ||
d602bd6a | 2385 | /* Set the capture bytecode if any. */ |
8dbb86b8 | 2386 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
28ab034a | 2387 | condition, &capture_bytecode_count); |
a0377dfe | 2388 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
bbd6675c JR |
2389 | |
2390 | for (i = 0; i < capture_bytecode_count; i++) { | |
2391 | const struct lttng_bytecode *capture_bytecode = | |
28ab034a JG |
2392 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index(condition, |
2393 | i); | |
bbd6675c | 2394 | |
cd9adb8b | 2395 | if (capture_bytecode == nullptr) { |
bbd6675c JR |
2396 | ERR("Unexpected NULL capture bytecode on condition"); |
2397 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2398 | goto capture_error; |
bbd6675c JR |
2399 | } |
2400 | ||
2401 | ret = kernctl_capture(event_notifier_rule->fd, capture_bytecode); | |
2402 | if (ret < 0) { | |
2403 | ERR("Failed to set capture bytecode on event notifier rule fd: fd = %d", | |
28ab034a | 2404 | event_notifier_rule->fd); |
bbd6675c | 2405 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
e8b1187d | 2406 | goto capture_error; |
bbd6675c JR |
2407 | } |
2408 | } | |
2409 | ||
352b58f5 JR |
2410 | err = kernctl_enable(event_notifier_rule->fd); |
2411 | if (err < 0) { | |
2412 | switch (-err) { | |
2413 | case EEXIST: | |
2414 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2415 | break; | |
2416 | default: | |
2417 | PERROR("enable kernel event notifier"); | |
2418 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2419 | break; | |
2420 | } | |
2421 | goto enable_error; | |
2422 | } | |
2423 | ||
2424 | /* Add trigger to kernel token mapping in the hash table. */ | |
2425 | rcu_read_lock(); | |
28ab034a JG |
2426 | cds_lfht_add(kernel_token_to_event_notifier_rule_ht, |
2427 | hash_trigger(trigger), | |
2428 | &event_notifier_rule->ht_node); | |
352b58f5 JR |
2429 | rcu_read_unlock(); |
2430 | ||
2431 | DBG("Created kernel event notifier: name = '%s', fd = %d", | |
28ab034a JG |
2432 | kernel_event_notifier.event.name, |
2433 | event_notifier_rule->fd); | |
352b58f5 JR |
2434 | |
2435 | return LTTNG_OK; | |
2436 | ||
e8b1187d | 2437 | capture_error: |
352b58f5 JR |
2438 | add_callsite_error: |
2439 | enable_error: | |
2440 | set_cloexec_error: | |
2441 | filter_error: | |
28ab034a JG |
2442 | { |
2443 | const int close_ret = close(event_notifier_rule->fd); | |
352b58f5 | 2444 | |
28ab034a JG |
2445 | if (close_ret) { |
2446 | PERROR("Failed to close kernel event notifier file descriptor: fd = %d", | |
2447 | event_notifier_rule->fd); | |
352b58f5 | 2448 | } |
28ab034a | 2449 | } |
352b58f5 JR |
2450 | free_event: |
2451 | free(event_notifier_rule); | |
2452 | error: | |
2453 | return error_code_ret; | |
2454 | } | |
2455 | ||
28ab034a JG |
2456 | enum lttng_error_code kernel_register_event_notifier(struct lttng_trigger *trigger, |
2457 | const struct lttng_credentials *cmd_creds) | |
352b58f5 JR |
2458 | { |
2459 | enum lttng_error_code ret; | |
2460 | enum lttng_condition_status status; | |
2461 | enum lttng_domain_type domain_type; | |
2462 | const struct lttng_event_rule *event_rule; | |
28ab034a | 2463 | const struct lttng_condition *const condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2464 | const uint64_t token = lttng_trigger_get_tracer_token(trigger); |
2465 | ||
a0377dfe | 2466 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2467 | |
2468 | /* Does not acquire a reference to the event rule. */ | |
28ab034a | 2469 | status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe | 2470 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
352b58f5 JR |
2471 | |
2472 | domain_type = lttng_event_rule_get_domain_type(event_rule); | |
a0377dfe | 2473 | LTTNG_ASSERT(domain_type == LTTNG_DOMAIN_KERNEL); |
352b58f5 JR |
2474 | |
2475 | ret = kernel_create_event_notifier_rule(trigger, cmd_creds, token); | |
2476 | if (ret != LTTNG_OK) { | |
124dda43 | 2477 | ERR("Failed to create kernel event notifier rule"); |
352b58f5 JR |
2478 | } |
2479 | ||
2480 | return ret; | |
2481 | } | |
2482 | ||
28ab034a | 2483 | enum lttng_error_code kernel_unregister_event_notifier(const struct lttng_trigger *trigger) |
352b58f5 JR |
2484 | { |
2485 | struct ltt_kernel_event_notifier_rule *token_event_rule_element; | |
2486 | struct cds_lfht_node *node; | |
2487 | struct cds_lfht_iter iter; | |
2488 | enum lttng_error_code error_code_ret; | |
2489 | int ret; | |
2490 | ||
2491 | rcu_read_lock(); | |
2492 | ||
2493 | cds_lfht_lookup(kernel_token_to_event_notifier_rule_ht, | |
28ab034a JG |
2494 | hash_trigger(trigger), |
2495 | match_trigger, | |
2496 | trigger, | |
2497 | &iter); | |
352b58f5 JR |
2498 | |
2499 | node = cds_lfht_iter_get_node(&iter); | |
2500 | if (!node) { | |
2501 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2502 | goto error; | |
2503 | } | |
2504 | ||
28ab034a JG |
2505 | token_event_rule_element = |
2506 | caa_container_of(node, struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2507 | |
2508 | ret = kernel_disable_event_notifier_rule(token_event_rule_element); | |
2509 | if (ret) { | |
2510 | error_code_ret = LTTNG_ERR_FATAL; | |
2511 | goto error; | |
2512 | } | |
2513 | ||
2514 | trace_kernel_destroy_event_notifier_rule(token_event_rule_element); | |
2515 | error_code_ret = LTTNG_OK; | |
2516 | ||
2517 | error: | |
2518 | rcu_read_unlock(); | |
2519 | ||
2520 | return error_code_ret; | |
2521 | } | |
2522 | ||
cd9adb8b | 2523 | int kernel_get_notification_fd() |
352b58f5 JR |
2524 | { |
2525 | return kernel_tracer_event_notifier_group_notification_fd; | |
2526 | } |