Commit | Line | Data |
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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" | |
28ab034a JG |
19 | #include "sessiond-config.hpp" |
20 | #include "tracker.hpp" | |
21 | #include "utils.hpp" | |
20fe2104 | 22 | |
c9e313bc SM |
23 | #include <common/common.hpp> |
24 | #include <common/hashtable/utils.hpp> | |
c9e313bc SM |
25 | #include <common/kernel-ctl/kernel-ctl.hpp> |
26 | #include <common/kernel-ctl/kernel-ioctl.hpp> | |
27 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
28ab034a | 28 | #include <common/trace-chunk.hpp> |
c9e313bc | 29 | #include <common/tracker.hpp> |
56047f5a | 30 | #include <common/urcu.hpp> |
c9e313bc | 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 | |
56a9a0b7 OD |
65 | namespace { |
66 | /* | |
67 | * On some architectures, calling convention details are embedded in the symbol | |
68 | * addresses. Uprobe requires a "clean" symbol offset (or at least, an address | |
69 | * where an instruction boundary would be legal) to add | |
70 | * instrumentation. sanitize_uprobe_offset implements that sanitization logic on | |
71 | * a per-architecture basis. | |
72 | */ | |
73 | #if defined(__arm__) || defined(__aarch64__) | |
74 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
75 | { | |
76 | /* | |
77 | * The least significant bit is used when branching to switch to thumb | |
78 | * ISA. However, it's an invalid address for us; mask the least | |
79 | * significant bit. | |
80 | */ | |
81 | return raw_offset &= ~0b1; | |
82 | } | |
83 | #else /* defined(__arm__) || defined(__aarch64__) */ | |
84 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
85 | { | |
86 | return raw_offset; | |
87 | } | |
88 | #endif | |
28f23191 | 89 | } /* namespace */ |
56a9a0b7 | 90 | |
d65106b1 | 91 | /* |
050349bb | 92 | * Add context on a kernel channel. |
df3c77c8 JG |
93 | * |
94 | * Assumes the ownership of ctx. | |
d65106b1 | 95 | */ |
28ab034a | 96 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, struct ltt_kernel_context *ctx) |
d65106b1 DG |
97 | { |
98 | int ret; | |
99 | ||
a0377dfe FD |
100 | LTTNG_ASSERT(chan); |
101 | LTTNG_ASSERT(ctx); | |
0525e9ae | 102 | |
d65106b1 | 103 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 104 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 105 | if (ret < 0) { |
32af2c95 | 106 | switch (-ret) { |
1ae5e83e JD |
107 | case ENOSYS: |
108 | /* Exists but not available for this kernel */ | |
109 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
110 | goto error; | |
111 | case EEXIST: | |
b579acd9 DG |
112 | /* If EEXIST, we just ignore the error */ |
113 | ret = 0; | |
1ae5e83e JD |
114 | goto end; |
115 | default: | |
116 | PERROR("add context ioctl"); | |
117 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
118 | goto error; | |
b579acd9 | 119 | } |
d65106b1 | 120 | } |
21ed98c1 | 121 | ret = 0; |
d65106b1 | 122 | |
1ae5e83e | 123 | end: |
645328ae | 124 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 125 | ctx->in_list = true; |
cd9adb8b | 126 | ctx = nullptr; |
d65106b1 | 127 | error: |
df3c77c8 JG |
128 | if (ctx) { |
129 | trace_kernel_destroy_context(ctx); | |
130 | } | |
d65106b1 DG |
131 | return ret; |
132 | } | |
133 | ||
20fe2104 | 134 | /* |
050349bb DG |
135 | * Create a new kernel session, register it to the kernel tracer and add it to |
136 | * the session daemon session. | |
20fe2104 | 137 | */ |
7d268848 | 138 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
139 | { |
140 | int ret; | |
141 | struct ltt_kernel_session *lks; | |
142 | ||
a0377dfe | 143 | LTTNG_ASSERT(session); |
0525e9ae | 144 | |
54012638 | 145 | /* Allocate data structure */ |
dec56f6c | 146 | lks = trace_kernel_create_session(); |
cd9adb8b | 147 | if (lks == nullptr) { |
54012638 | 148 | ret = -1; |
20fe2104 DG |
149 | goto error; |
150 | } | |
151 | ||
54012638 | 152 | /* Kernel tracer session creation */ |
7d268848 | 153 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 154 | if (ret < 0) { |
df0f840b | 155 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
156 | goto error; |
157 | } | |
158 | ||
20fe2104 | 159 | lks->fd = ret; |
7b395890 DG |
160 | /* Prevent fd duplication after execlp() */ |
161 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
162 | if (ret < 0) { | |
df0f840b | 163 | PERROR("fcntl session fd"); |
7b395890 DG |
164 | } |
165 | ||
53632229 | 166 | lks->id = session->id; |
3bd1e081 | 167 | lks->consumer_fds_sent = 0; |
8c0faa1d | 168 | session->kernel_session = lks; |
8c0faa1d DG |
169 | |
170 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 171 | |
8ff4109e JR |
172 | /* |
173 | * This is necessary since the creation time is present in the session | |
174 | * name when it is generated. | |
175 | */ | |
176 | if (session->has_auto_generated_name) { | |
177 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
178 | } else { | |
179 | ret = kernctl_session_set_name(lks->fd, session->name); | |
180 | } | |
181 | if (ret) { | |
182 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
28ab034a JG |
183 | session->id, |
184 | session->name); | |
8ff4109e JR |
185 | } |
186 | ||
e04b2181 JR |
187 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
188 | if (ret) { | |
189 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
28ab034a JG |
190 | session->id, |
191 | session->name); | |
e04b2181 JR |
192 | } |
193 | ||
20fe2104 DG |
194 | return 0; |
195 | ||
196 | error: | |
5f62c685 DG |
197 | if (lks) { |
198 | trace_kernel_destroy_session(lks); | |
d070c424 | 199 | trace_kernel_free_session(lks); |
5f62c685 | 200 | } |
20fe2104 DG |
201 | return ret; |
202 | } | |
203 | ||
204 | /* | |
050349bb DG |
205 | * Create a kernel channel, register it to the kernel tracer and add it to the |
206 | * kernel session. | |
20fe2104 | 207 | */ |
28ab034a | 208 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan) |
20fe2104 DG |
209 | { |
210 | int ret; | |
211 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 212 | |
a0377dfe FD |
213 | LTTNG_ASSERT(session); |
214 | LTTNG_ASSERT(chan); | |
0525e9ae | 215 | |
54012638 | 216 | /* Allocate kernel channel */ |
fdd9eb17 | 217 | lkc = trace_kernel_create_channel(chan); |
cd9adb8b | 218 | if (lkc == nullptr) { |
20fe2104 DG |
219 | goto error; |
220 | } | |
221 | ||
ecc48a90 | 222 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
28ab034a JG |
223 | chan->name, |
224 | lkc->channel->attr.overwrite, | |
225 | lkc->channel->attr.subbuf_size, | |
226 | lkc->channel->attr.num_subbuf, | |
227 | lkc->channel->attr.switch_timer_interval, | |
228 | lkc->channel->attr.read_timer_interval, | |
229 | lkc->channel->attr.live_timer_interval, | |
230 | lkc->channel->attr.output); | |
173af62f | 231 | |
54012638 | 232 | /* Kernel tracer channel creation */ |
f3ed775e | 233 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 234 | if (ret < 0) { |
df0f840b | 235 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
236 | goto error; |
237 | } | |
238 | ||
54012638 | 239 | /* Setup the channel fd */ |
20fe2104 | 240 | lkc->fd = ret; |
7b395890 DG |
241 | /* Prevent fd duplication after execlp() */ |
242 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
243 | if (ret < 0) { | |
df0f840b | 244 | PERROR("fcntl session fd"); |
7b395890 DG |
245 | } |
246 | ||
54012638 | 247 | /* Add channel to session */ |
8c0faa1d DG |
248 | cds_list_add(&lkc->list, &session->channel_list.head); |
249 | session->channel_count++; | |
fb5f35b6 | 250 | lkc->session = session; |
e1f3997a | 251 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 252 | |
e1f3997a | 253 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
254 | lkc->channel->name, |
255 | lkc->fd, | |
256 | lkc->key); | |
20fe2104 DG |
257 | |
258 | return 0; | |
259 | ||
260 | error: | |
5f62c685 DG |
261 | if (lkc) { |
262 | free(lkc->channel); | |
263 | free(lkc); | |
264 | } | |
54012638 | 265 | return -1; |
20fe2104 | 266 | } |
f34daff7 | 267 | |
352b58f5 JR |
268 | /* |
269 | * Create a kernel event notifier group, register it to the kernel tracer and | |
270 | * add it to the kernel session. | |
271 | */ | |
272 | static int kernel_create_event_notifier_group(int *event_notifier_group_fd) | |
273 | { | |
274 | int ret; | |
275 | int local_fd = -1; | |
276 | ||
a0377dfe | 277 | LTTNG_ASSERT(event_notifier_group_fd); |
352b58f5 JR |
278 | |
279 | /* Kernel event notifier group creation. */ | |
280 | ret = kernctl_create_event_notifier_group(kernel_tracer_fd); | |
281 | if (ret < 0) { | |
282 | PERROR("Failed to create kernel event notifier group"); | |
283 | ret = -1; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | local_fd = ret; | |
288 | ||
289 | /* Prevent fd duplication after execlp(). */ | |
290 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
291 | if (ret < 0) { | |
292 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 293 | local_fd); |
352b58f5 JR |
294 | goto error; |
295 | } | |
296 | ||
297 | DBG("Created kernel event notifier group: fd = %d", local_fd); | |
298 | *event_notifier_group_fd = local_fd; | |
299 | local_fd = -1; | |
300 | ret = 0; | |
301 | error: | |
302 | if (local_fd >= 0) { | |
303 | ret = close(local_fd); | |
304 | if (ret) { | |
305 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 306 | local_fd); |
352b58f5 JR |
307 | } |
308 | } | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
410b78a0 FD |
313 | /* |
314 | * Compute the offset of the instrumentation byte in the binary based on the | |
315 | * function probe location using the ELF lookup method. | |
316 | * | |
317 | * Returns 0 on success and set the offset out parameter to the offset of the | |
318 | * elf symbol | |
319 | * Returns -1 on error | |
320 | */ | |
28ab034a JG |
321 | static int extract_userspace_probe_offset_function_elf( |
322 | const struct lttng_userspace_probe_location *probe_location, | |
323 | uid_t uid, | |
324 | gid_t gid, | |
325 | uint64_t *offset) | |
410b78a0 FD |
326 | { |
327 | int fd; | |
328 | int ret = 0; | |
cd9adb8b JG |
329 | const char *symbol = nullptr; |
330 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; | |
410b78a0 FD |
331 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
332 | ||
a0377dfe | 333 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 334 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
410b78a0 | 335 | |
28ab034a | 336 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); |
410b78a0 FD |
337 | if (!lookup) { |
338 | ret = -1; | |
339 | goto end; | |
340 | } | |
341 | ||
28ab034a | 342 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 343 | |
a0377dfe | 344 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 345 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); |
410b78a0 | 346 | |
28ab034a | 347 | symbol = lttng_userspace_probe_location_function_get_function_name(probe_location); |
410b78a0 FD |
348 | if (!symbol) { |
349 | ret = -1; | |
350 | goto end; | |
351 | } | |
352 | ||
353 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
354 | if (fd < 0) { | |
355 | ret = -1; | |
356 | goto end; | |
357 | } | |
358 | ||
0a398bc4 | 359 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
360 | if (ret < 0) { |
361 | DBG("userspace probe offset calculation failed for " | |
28ab034a JG |
362 | "function %s", |
363 | symbol); | |
410b78a0 FD |
364 | goto end; |
365 | } | |
366 | ||
28ab034a | 367 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t) (*offset)); |
410b78a0 FD |
368 | end: |
369 | return ret; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
374 | * tracepoint probe location using the SDT lookup method. This function | |
375 | * allocates the offsets buffer, the caller must free it. | |
376 | * | |
377 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
378 | * SDT tracepoint. | |
379 | * Returns -1 on error. | |
380 | */ | |
28ab034a JG |
381 | static int extract_userspace_probe_offset_tracepoint_sdt( |
382 | const struct lttng_userspace_probe_location *probe_location, | |
383 | uid_t uid, | |
384 | gid_t gid, | |
385 | uint64_t **offsets, | |
386 | uint32_t *offsets_count) | |
410b78a0 FD |
387 | { |
388 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
cd9adb8b JG |
389 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; |
390 | const char *probe_name = nullptr, *provider_name = nullptr; | |
410b78a0 FD |
391 | int ret = 0; |
392 | int fd, i; | |
393 | ||
a0377dfe | 394 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 395 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
410b78a0 FD |
396 | |
397 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
398 | if (!lookup) { | |
399 | ret = -1; | |
400 | goto end; | |
401 | } | |
402 | ||
28ab034a | 403 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 404 | |
a0377dfe | 405 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 406 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); |
410b78a0 | 407 | |
28ab034a | 408 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(probe_location); |
410b78a0 FD |
409 | if (!probe_name) { |
410 | ret = -1; | |
411 | goto end; | |
412 | } | |
413 | ||
28ab034a | 414 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(probe_location); |
410b78a0 FD |
415 | if (!provider_name) { |
416 | ret = -1; | |
417 | goto end; | |
418 | } | |
419 | ||
420 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
421 | if (fd < 0) { | |
422 | ret = -1; | |
423 | goto end; | |
424 | } | |
425 | ||
28ab034a JG |
426 | ret = run_as_extract_sdt_probe_offsets( |
427 | fd, provider_name, probe_name, uid, gid, offsets, offsets_count); | |
410b78a0 FD |
428 | if (ret < 0) { |
429 | DBG("userspace probe offset calculation failed for sdt " | |
28ab034a JG |
430 | "probe %s:%s", |
431 | provider_name, | |
432 | probe_name); | |
410b78a0 FD |
433 | goto end; |
434 | } | |
435 | ||
436 | if (*offsets_count == 0) { | |
437 | DBG("no userspace probe offset found"); | |
438 | goto end; | |
439 | } | |
440 | ||
441 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
28ab034a JG |
442 | *offsets_count, |
443 | provider_name, | |
444 | probe_name); | |
410b78a0 | 445 | for (i = 0; i < *offsets_count; i++) { |
28ab034a | 446 | DBG("\t0x%jd", (intmax_t) ((*offsets)[i])); |
410b78a0 FD |
447 | } |
448 | end: | |
449 | return ret; | |
450 | } | |
451 | ||
28ab034a JG |
452 | static int userspace_probe_add_callsite(const struct lttng_userspace_probe_location *location, |
453 | uid_t uid, | |
454 | gid_t gid, | |
455 | int fd) | |
410b78a0 | 456 | { |
cd9adb8b | 457 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = nullptr; |
410b78a0 | 458 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
459 | int ret; |
460 | ||
0a398bc4 | 461 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
462 | if (!lookup_method) { |
463 | ret = -1; | |
464 | goto end; | |
465 | } | |
466 | ||
467 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
468 | switch (type) { | |
469 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
470 | { | |
b8e2fb80 | 471 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
472 | uint64_t offset; |
473 | ||
28ab034a | 474 | ret = extract_userspace_probe_offset_function_elf(location, uid, gid, &offset); |
410b78a0 FD |
475 | if (ret) { |
476 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
477 | goto end; | |
478 | } | |
479 | ||
56a9a0b7 | 480 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offset); |
410b78a0 FD |
481 | ret = kernctl_add_callsite(fd, &callsite); |
482 | if (ret) { | |
0a398bc4 | 483 | WARN("Failed to add callsite to ELF userspace probe."); |
410b78a0 FD |
484 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
485 | goto end; | |
486 | } | |
487 | break; | |
488 | } | |
489 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
490 | { | |
491 | int i; | |
cd9adb8b | 492 | uint64_t *offsets = nullptr; |
410b78a0 | 493 | uint32_t offsets_count; |
b8e2fb80 | 494 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
495 | |
496 | /* | |
497 | * This call allocates the offsets buffer. This buffer must be freed | |
498 | * by the caller | |
499 | */ | |
28ab034a JG |
500 | ret = extract_userspace_probe_offset_tracepoint_sdt( |
501 | location, uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
502 | if (ret) { |
503 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
504 | goto end; | |
505 | } | |
506 | for (i = 0; i < offsets_count; i++) { | |
56a9a0b7 | 507 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offsets[i]); |
410b78a0 FD |
508 | ret = kernctl_add_callsite(fd, &callsite); |
509 | if (ret) { | |
0a398bc4 | 510 | WARN("Failed to add callsite to SDT userspace probe"); |
410b78a0 FD |
511 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
512 | free(offsets); | |
513 | goto end; | |
514 | } | |
515 | } | |
516 | free(offsets); | |
517 | break; | |
518 | } | |
519 | default: | |
520 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
521 | goto end; | |
522 | } | |
523 | end: | |
524 | return ret; | |
525 | } | |
526 | ||
0a398bc4 FD |
527 | /* |
528 | * Extract the offsets of the instrumentation point for the different lookup | |
529 | * methods. | |
530 | */ | |
28ab034a JG |
531 | static int userspace_probe_event_add_callsites(struct lttng_event *ev, |
532 | struct ltt_kernel_session *session, | |
533 | int fd) | |
0a398bc4 FD |
534 | { |
535 | int ret; | |
cd9adb8b | 536 | const struct lttng_userspace_probe_location *location = nullptr; |
0a398bc4 | 537 | |
a0377dfe FD |
538 | LTTNG_ASSERT(ev); |
539 | LTTNG_ASSERT(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
0a398bc4 FD |
540 | |
541 | location = lttng_event_get_userspace_probe_location(ev); | |
542 | if (!location) { | |
543 | ret = -1; | |
544 | goto end; | |
545 | } | |
546 | ||
28ab034a | 547 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, fd); |
0a398bc4 | 548 | if (ret) { |
28ab034a | 549 | WARN("Failed to add callsite to userspace probe event '%s'", ev->name); |
0a398bc4 FD |
550 | } |
551 | ||
552 | end: | |
553 | return ret; | |
554 | } | |
555 | ||
352b58f5 JR |
556 | /* |
557 | * Extract the offsets of the instrumentation point for the different look-up | |
558 | * methods. | |
559 | */ | |
28ab034a JG |
560 | static int userspace_probe_event_rule_add_callsites(const struct lttng_event_rule *rule, |
561 | const struct lttng_credentials *creds, | |
562 | int fd) | |
352b58f5 JR |
563 | { |
564 | int ret; | |
565 | enum lttng_event_rule_status status; | |
566 | enum lttng_event_rule_type event_rule_type; | |
cd9adb8b | 567 | const struct lttng_userspace_probe_location *location = nullptr; |
352b58f5 | 568 | |
a0377dfe FD |
569 | LTTNG_ASSERT(rule); |
570 | LTTNG_ASSERT(creds); | |
352b58f5 JR |
571 | |
572 | event_rule_type = lttng_event_rule_get_type(rule); | |
a0377dfe | 573 | LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
352b58f5 | 574 | |
46fd07ac | 575 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); |
352b58f5 JR |
576 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { |
577 | ret = -1; | |
578 | goto end; | |
579 | } | |
580 | ||
28ab034a JG |
581 | ret = userspace_probe_add_callsite( |
582 | location, lttng_credentials_get_uid(creds), lttng_credentials_get_gid(creds), fd); | |
352b58f5 | 583 | if (ret) { |
28ab034a | 584 | WARN("Failed to add callsite to user space probe object: fd = %d", fd); |
352b58f5 JR |
585 | } |
586 | ||
587 | end: | |
588 | return ret; | |
589 | } | |
590 | ||
f34daff7 | 591 | /* |
050349bb DG |
592 | * Create a kernel event, enable it to the kernel tracer and add it to the |
593 | * channel event list of the kernel session. | |
49d21f93 | 594 | * We own filter_expression and filter. |
f34daff7 | 595 | */ |
050349bb | 596 | int kernel_create_event(struct lttng_event *ev, |
28ab034a JG |
597 | struct ltt_kernel_channel *channel, |
598 | char *filter_expression, | |
599 | struct lttng_bytecode *filter) | |
f34daff7 | 600 | { |
71a3bb01 FD |
601 | int err, fd; |
602 | enum lttng_error_code ret; | |
f34daff7 | 603 | struct ltt_kernel_event *event; |
f34daff7 | 604 | |
a0377dfe FD |
605 | LTTNG_ASSERT(ev); |
606 | LTTNG_ASSERT(channel); | |
0525e9ae | 607 | |
a969e101 | 608 | /* We pass ownership of filter_expression and filter */ |
28ab034a | 609 | ret = trace_kernel_create_event(ev, filter_expression, filter, &event); |
71a3bb01 | 610 | if (ret != LTTNG_OK) { |
f34daff7 DG |
611 | goto error; |
612 | } | |
613 | ||
71a3bb01 FD |
614 | fd = kernctl_create_event(channel->fd, event->event); |
615 | if (fd < 0) { | |
616 | switch (-fd) { | |
bd29c13d | 617 | case EEXIST: |
71a3bb01 | 618 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
619 | break; |
620 | case ENOSYS: | |
621 | WARN("Event type not implemented"); | |
71a3bb01 | 622 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 623 | break; |
8197a339 DG |
624 | case ENOENT: |
625 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 626 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 627 | break; |
bd29c13d | 628 | default: |
71a3bb01 | 629 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
630 | PERROR("create event ioctl"); |
631 | } | |
e953ef25 | 632 | goto free_event; |
8c0faa1d | 633 | } |
f34daff7 | 634 | |
d0ae4ea8 | 635 | event->type = ev->type; |
71a3bb01 | 636 | event->fd = fd; |
7b395890 | 637 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
638 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
639 | if (err < 0) { | |
df0f840b | 640 | PERROR("fcntl session fd"); |
7b395890 DG |
641 | } |
642 | ||
00a62084 | 643 | if (filter) { |
71a3bb01 FD |
644 | err = kernctl_filter(event->fd, filter); |
645 | if (err < 0) { | |
646 | switch (-err) { | |
647 | case ENOMEM: | |
648 | ret = LTTNG_ERR_FILTER_NOMEM; | |
649 | break; | |
650 | default: | |
651 | ret = LTTNG_ERR_FILTER_INVAL; | |
652 | break; | |
653 | } | |
00a62084 MD |
654 | goto filter_error; |
655 | } | |
656 | } | |
657 | ||
dcabc190 | 658 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
28ab034a JG |
659 | ret = (lttng_error_code) userspace_probe_event_add_callsites( |
660 | ev, channel->session, event->fd); | |
dcabc190 FD |
661 | if (ret) { |
662 | goto add_callsite_error; | |
663 | } | |
664 | } | |
665 | ||
71a3bb01 FD |
666 | err = kernctl_enable(event->fd); |
667 | if (err < 0) { | |
668 | switch (-err) { | |
00a62084 MD |
669 | case EEXIST: |
670 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
671 | break; | |
672 | default: | |
673 | PERROR("enable kernel event"); | |
71a3bb01 | 674 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
675 | break; |
676 | } | |
677 | goto enable_error; | |
678 | } | |
679 | ||
f3ed775e DG |
680 | /* Add event to event list */ |
681 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
682 | channel->event_count++; |
683 | ||
e953ef25 DG |
684 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
685 | ||
686 | return 0; | |
687 | ||
dcabc190 | 688 | add_callsite_error: |
00a62084 MD |
689 | enable_error: |
690 | filter_error: | |
28ab034a JG |
691 | { |
692 | int closeret; | |
00a62084 | 693 | |
28ab034a JG |
694 | closeret = close(event->fd); |
695 | if (closeret) { | |
696 | PERROR("close event fd"); | |
00a62084 | 697 | } |
28ab034a | 698 | } |
e953ef25 DG |
699 | free_event: |
700 | free(event); | |
701 | error: | |
d87bfb32 | 702 | return ret; |
e953ef25 DG |
703 | } |
704 | ||
26cc6b4e | 705 | /* |
050349bb | 706 | * Disable a kernel channel. |
26cc6b4e DG |
707 | */ |
708 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
709 | { | |
710 | int ret; | |
711 | ||
a0377dfe | 712 | LTTNG_ASSERT(chan); |
0525e9ae | 713 | |
26cc6b4e DG |
714 | ret = kernctl_disable(chan->fd); |
715 | if (ret < 0) { | |
df0f840b | 716 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
717 | goto error; |
718 | } | |
719 | ||
66cefebd | 720 | chan->enabled = false; |
e1f3997a | 721 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
722 | chan->channel->name, |
723 | chan->fd, | |
724 | chan->key); | |
26cc6b4e DG |
725 | |
726 | return 0; | |
727 | ||
728 | error: | |
729 | return ret; | |
730 | } | |
731 | ||
d36b8583 | 732 | /* |
050349bb | 733 | * Enable a kernel channel. |
d36b8583 DG |
734 | */ |
735 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
736 | { | |
737 | int ret; | |
738 | ||
a0377dfe | 739 | LTTNG_ASSERT(chan); |
0525e9ae | 740 | |
d36b8583 | 741 | ret = kernctl_enable(chan->fd); |
32af2c95 | 742 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 743 | PERROR("Enable kernel chan"); |
d36b8583 DG |
744 | goto error; |
745 | } | |
746 | ||
66cefebd | 747 | chan->enabled = true; |
e1f3997a | 748 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
749 | chan->channel->name, |
750 | chan->fd, | |
751 | chan->key); | |
d36b8583 DG |
752 | |
753 | return 0; | |
754 | ||
755 | error: | |
756 | return ret; | |
757 | } | |
758 | ||
19e70852 | 759 | /* |
050349bb | 760 | * Enable a kernel event. |
19e70852 DG |
761 | */ |
762 | int kernel_enable_event(struct ltt_kernel_event *event) | |
763 | { | |
764 | int ret; | |
765 | ||
a0377dfe | 766 | LTTNG_ASSERT(event); |
0525e9ae | 767 | |
19e70852 | 768 | ret = kernctl_enable(event->fd); |
42224349 | 769 | if (ret < 0) { |
32af2c95 | 770 | switch (-ret) { |
42224349 | 771 | case EEXIST: |
f73fabfd | 772 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
773 | break; |
774 | default: | |
775 | PERROR("enable kernel event"); | |
776 | break; | |
777 | } | |
19e70852 DG |
778 | goto error; |
779 | } | |
780 | ||
66cefebd | 781 | event->enabled = true; |
19e70852 DG |
782 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); |
783 | ||
784 | return 0; | |
785 | ||
786 | error: | |
d36b8583 | 787 | return ret; |
19e70852 DG |
788 | } |
789 | ||
e953ef25 | 790 | /* |
050349bb | 791 | * Disable a kernel event. |
e953ef25 | 792 | */ |
19e70852 | 793 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
794 | { |
795 | int ret; | |
19e70852 | 796 | |
a0377dfe | 797 | LTTNG_ASSERT(event); |
0525e9ae | 798 | |
19e70852 | 799 | ret = kernctl_disable(event->fd); |
42224349 | 800 | if (ret < 0) { |
d79bd829 | 801 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
28ab034a JG |
802 | event->event->name, |
803 | event->fd); | |
19e70852 | 804 | goto error; |
e953ef25 | 805 | } |
f3ed775e | 806 | |
66cefebd | 807 | event->enabled = false; |
19e70852 DG |
808 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); |
809 | ||
f34daff7 DG |
810 | return 0; |
811 | ||
812 | error: | |
d36b8583 | 813 | return ret; |
f34daff7 | 814 | } |
aaf26714 | 815 | |
352b58f5 JR |
816 | /* |
817 | * Disable a kernel event notifier. | |
818 | */ | |
28ab034a | 819 | static int kernel_disable_event_notifier_rule(struct ltt_kernel_event_notifier_rule *event) |
352b58f5 JR |
820 | { |
821 | int ret; | |
822 | ||
a0377dfe | 823 | LTTNG_ASSERT(event); |
352b58f5 | 824 | |
56047f5a | 825 | lttng::urcu::read_lock_guard read_lock; |
352b58f5 | 826 | cds_lfht_del(kernel_token_to_event_notifier_rule_ht, &event->ht_node); |
352b58f5 JR |
827 | |
828 | ret = kernctl_disable(event->fd); | |
829 | if (ret < 0) { | |
d79bd829 | 830 | PERROR("Failed to disable kernel event notifier: fd = %d, token = %" PRIu64, |
28ab034a JG |
831 | event->fd, |
832 | event->token); | |
352b58f5 JR |
833 | goto error; |
834 | } | |
835 | ||
66cefebd | 836 | event->enabled = false; |
28ab034a | 837 | DBG("Disabled kernel event notifier: fd = %d, token = %" PRIu64, event->fd, event->token); |
352b58f5 JR |
838 | |
839 | error: | |
840 | return ret; | |
841 | } | |
842 | ||
28ab034a JG |
843 | static struct process_attr_tracker * |
844 | _kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
845 | enum lttng_process_attr process_attr) | |
55c9e7ca | 846 | { |
159b042f JG |
847 | switch (process_attr) { |
848 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
849 | return session->tracker_pid; | |
850 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
851 | return session->tracker_vpid; | |
852 | case LTTNG_PROCESS_ATTR_USER_ID: | |
853 | return session->tracker_uid; | |
854 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
855 | return session->tracker_vuid; | |
856 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
857 | return session->tracker_gid; | |
858 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
859 | return session->tracker_vgid; | |
55c9e7ca | 860 | default: |
cd9adb8b | 861 | return nullptr; |
55c9e7ca JR |
862 | } |
863 | } | |
6e911cad | 864 | |
28ab034a JG |
865 | const struct process_attr_tracker * |
866 | kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
867 | enum lttng_process_attr process_attr) | |
ccf10263 | 868 | { |
28ab034a JG |
869 | return (const struct process_attr_tracker *) _kernel_get_process_attr_tracker(session, |
870 | process_attr); | |
159b042f | 871 | } |
7c493d31 | 872 | |
28ab034a JG |
873 | enum lttng_error_code |
874 | kernel_process_attr_tracker_set_tracking_policy(struct ltt_kernel_session *session, | |
875 | enum lttng_process_attr process_attr, | |
876 | enum lttng_tracking_policy policy) | |
159b042f JG |
877 | { |
878 | int ret; | |
879 | enum lttng_error_code ret_code = LTTNG_OK; | |
880 | struct process_attr_tracker *tracker = | |
28ab034a | 881 | _kernel_get_process_attr_tracker(session, process_attr); |
159b042f | 882 | enum lttng_tracking_policy previous_policy; |
55c9e7ca | 883 | |
159b042f JG |
884 | if (!tracker) { |
885 | ret_code = LTTNG_ERR_INVALID; | |
886 | goto end; | |
7c493d31 | 887 | } |
ccf10263 | 888 | |
159b042f JG |
889 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
890 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
891 | if (ret) { | |
892 | ret_code = LTTNG_ERR_UNK; | |
893 | goto end; | |
55c9e7ca | 894 | } |
7c493d31 | 895 | |
159b042f | 896 | if (previous_policy == policy) { |
55c9e7ca | 897 | goto end; |
7c493d31 | 898 | } |
55c9e7ca | 899 | |
159b042f JG |
900 | switch (policy) { |
901 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
902 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
903 | /* | |
904 | * Maintain a special case for the process ID process | |
905 | * attribute tracker as it was the only supported | |
906 | * attribute prior to 2.12. | |
907 | */ | |
908 | ret = kernctl_track_pid(session->fd, -1); | |
909 | } else { | |
910 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
911 | } |
912 | break; | |
159b042f JG |
913 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
914 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
915 | /* fall-through. */ | |
916 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
917 | /* | |
918 | * Maintain a special case for the process ID process | |
919 | * attribute tracker as it was the only supported | |
920 | * attribute prior to 2.12. | |
921 | */ | |
922 | ret = kernctl_untrack_pid(session->fd, -1); | |
923 | } else { | |
924 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
925 | } |
926 | break; | |
927 | default: | |
159b042f | 928 | abort(); |
55c9e7ca | 929 | } |
159b042f | 930 | /* kern-ctl error handling */ |
32af2c95 | 931 | switch (-ret) { |
159b042f JG |
932 | case 0: |
933 | ret_code = LTTNG_OK; | |
934 | break; | |
7c493d31 | 935 | case EINVAL: |
159b042f | 936 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 937 | break; |
7c493d31 | 938 | case ENOMEM: |
159b042f | 939 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
940 | break; |
941 | case EEXIST: | |
159b042f | 942 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 943 | break; |
7c493d31 | 944 | default: |
159b042f | 945 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
946 | break; |
947 | } | |
55c9e7ca | 948 | end: |
159b042f | 949 | return ret_code; |
ccf10263 MD |
950 | } |
951 | ||
28ab034a JG |
952 | enum lttng_error_code |
953 | kernel_process_attr_tracker_inclusion_set_add_value(struct ltt_kernel_session *session, | |
954 | enum lttng_process_attr process_attr, | |
955 | const struct process_attr_value *value) | |
a5dfbb9d | 956 | { |
159b042f JG |
957 | int ret, integral_value; |
958 | enum lttng_error_code ret_code; | |
959 | struct process_attr_tracker *tracker; | |
960 | enum process_attr_tracker_status status; | |
a5dfbb9d | 961 | |
159b042f JG |
962 | /* |
963 | * Convert process attribute tracker value to the integral | |
964 | * representation required by the kern-ctl API. | |
965 | */ | |
966 | switch (process_attr) { | |
967 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
968 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
969 | integral_value = (int) value->value.pid; | |
55c9e7ca | 970 | break; |
159b042f JG |
971 | case LTTNG_PROCESS_ATTR_USER_ID: |
972 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
973 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
974 | uid_t uid; | |
975 | ||
28ab034a | 976 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
977 | if (ret_code != LTTNG_OK) { |
978 | goto end; | |
979 | } | |
980 | integral_value = (int) uid; | |
981 | } else { | |
982 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
983 | } |
984 | break; | |
159b042f JG |
985 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
986 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
987 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
988 | gid_t gid; | |
989 | ||
28ab034a | 990 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
991 | if (ret_code != LTTNG_OK) { |
992 | goto end; | |
993 | } | |
994 | integral_value = (int) gid; | |
995 | } else { | |
996 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 997 | } |
55c9e7ca JR |
998 | break; |
999 | default: | |
159b042f JG |
1000 | ret_code = LTTNG_ERR_INVALID; |
1001 | goto end; | |
55c9e7ca JR |
1002 | } |
1003 | ||
159b042f JG |
1004 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1005 | if (!tracker) { | |
1006 | ret_code = LTTNG_ERR_INVALID; | |
1007 | goto end; | |
1008 | } | |
1009 | ||
1010 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
1011 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1012 | switch (status) { | |
1013 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
1014 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
1015 | break; | |
1016 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1017 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1018 | break; | |
1019 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1020 | default: | |
1021 | ret_code = LTTNG_ERR_UNK; | |
1022 | break; | |
1023 | } | |
1024 | goto end; | |
1025 | } | |
1026 | ||
1027 | DBG("Kernel track %s %d for session id %" PRIu64, | |
28ab034a JG |
1028 | lttng_process_attr_to_string(process_attr), |
1029 | integral_value, | |
1030 | session->id); | |
159b042f JG |
1031 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1032 | /* | |
1033 | * Maintain a special case for the process ID process attribute | |
1034 | * tracker as it was the only supported attribute prior to 2.12. | |
1035 | */ | |
1036 | ret = kernctl_track_pid(session->fd, integral_value); | |
1037 | } else { | |
28ab034a | 1038 | ret = kernctl_track_id(session->fd, process_attr, integral_value); |
159b042f JG |
1039 | } |
1040 | if (ret == 0) { | |
1041 | ret_code = LTTNG_OK; | |
1042 | goto end; | |
1043 | } | |
1044 | ||
1045 | kernel_wait_quiescent(); | |
1046 | ||
1047 | /* kern-ctl error handling */ | |
55c9e7ca | 1048 | switch (-ret) { |
159b042f JG |
1049 | case 0: |
1050 | ret_code = LTTNG_OK; | |
1051 | break; | |
55c9e7ca | 1052 | case EINVAL: |
159b042f | 1053 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1054 | break; |
1055 | case ENOMEM: | |
159b042f | 1056 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1057 | break; |
1058 | case EEXIST: | |
159b042f | 1059 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1060 | break; |
1061 | default: | |
159b042f | 1062 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1063 | break; |
a5dfbb9d MD |
1064 | } |
1065 | ||
159b042f | 1066 | /* Attempt to remove the value from the tracker. */ |
28ab034a | 1067 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1068 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1069 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1070 | lttng_process_attr_to_string(process_attr), |
1071 | integral_value); | |
55c9e7ca | 1072 | } |
a5dfbb9d | 1073 | end: |
159b042f | 1074 | return ret_code; |
55c9e7ca | 1075 | } |
a5dfbb9d | 1076 | |
28ab034a JG |
1077 | enum lttng_error_code |
1078 | kernel_process_attr_tracker_inclusion_set_remove_value(struct ltt_kernel_session *session, | |
1079 | enum lttng_process_attr process_attr, | |
1080 | const struct process_attr_value *value) | |
55c9e7ca | 1081 | { |
159b042f JG |
1082 | int ret, integral_value; |
1083 | enum lttng_error_code ret_code; | |
1084 | struct process_attr_tracker *tracker; | |
1085 | enum process_attr_tracker_status status; | |
1086 | ||
1087 | /* | |
1088 | * Convert process attribute tracker value to the integral | |
1089 | * representation required by the kern-ctl API. | |
1090 | */ | |
1091 | switch (process_attr) { | |
1092 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1093 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1094 | integral_value = (int) value->value.pid; | |
1095 | break; | |
1096 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1097 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1098 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1099 | uid_t uid; | |
1100 | ||
28ab034a | 1101 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
1102 | if (ret_code != LTTNG_OK) { |
1103 | goto end; | |
1104 | } | |
1105 | integral_value = (int) uid; | |
1106 | } else { | |
1107 | integral_value = (int) value->value.uid; | |
1108 | } | |
1109 | break; | |
1110 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1111 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1112 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1113 | gid_t gid; | |
1114 | ||
28ab034a | 1115 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
1116 | if (ret_code != LTTNG_OK) { |
1117 | goto end; | |
1118 | } | |
1119 | integral_value = (int) gid; | |
1120 | } else { | |
1121 | integral_value = (int) value->value.gid; | |
1122 | } | |
1123 | break; | |
1124 | default: | |
1125 | ret_code = LTTNG_ERR_INVALID; | |
1126 | goto end; | |
1127 | } | |
55c9e7ca | 1128 | |
159b042f JG |
1129 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1130 | if (!tracker) { | |
1131 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1132 | goto end; |
a5dfbb9d | 1133 | } |
a7a533cd | 1134 | |
28ab034a | 1135 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1136 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1137 | switch (status) { | |
1138 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1139 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1140 | break; | |
1141 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1142 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1143 | break; | |
1144 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1145 | default: | |
1146 | ret_code = LTTNG_ERR_UNK; | |
1147 | break; | |
1148 | } | |
a7a533cd JR |
1149 | goto end; |
1150 | } | |
1151 | ||
159b042f | 1152 | DBG("Kernel track %s %d for session id %" PRIu64, |
28ab034a JG |
1153 | lttng_process_attr_to_string(process_attr), |
1154 | integral_value, | |
1155 | session->id); | |
159b042f JG |
1156 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1157 | /* | |
1158 | * Maintain a special case for the process ID process attribute | |
1159 | * tracker as it was the only supported attribute prior to 2.12. | |
1160 | */ | |
1161 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1162 | } else { | |
28ab034a | 1163 | ret = kernctl_untrack_id(session->fd, process_attr, integral_value); |
159b042f JG |
1164 | } |
1165 | if (ret == 0) { | |
1166 | ret_code = LTTNG_OK; | |
1167 | goto end; | |
1168 | } | |
1169 | kernel_wait_quiescent(); | |
1170 | ||
1171 | /* kern-ctl error handling */ | |
1172 | switch (-ret) { | |
1173 | case 0: | |
1174 | ret_code = LTTNG_OK; | |
1175 | break; | |
1176 | case EINVAL: | |
1177 | ret_code = LTTNG_ERR_INVALID; | |
1178 | break; | |
1179 | case ENOMEM: | |
1180 | ret_code = LTTNG_ERR_NOMEM; | |
1181 | break; | |
1182 | case ENOENT: | |
1183 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1184 | break; | |
1185 | default: | |
1186 | ret_code = LTTNG_ERR_UNK; | |
1187 | break; | |
1188 | } | |
1189 | ||
1190 | /* Attempt to add the value to the tracker. */ | |
28ab034a | 1191 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); |
159b042f JG |
1192 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1193 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1194 | lttng_process_attr_to_string(process_attr), |
1195 | integral_value); | |
159b042f | 1196 | } |
a7a533cd | 1197 | end: |
159b042f | 1198 | return ret_code; |
a5dfbb9d MD |
1199 | } |
1200 | ||
aaf26714 | 1201 | /* |
050349bb DG |
1202 | * Create kernel metadata, open from the kernel tracer and add it to the |
1203 | * kernel session. | |
aaf26714 | 1204 | */ |
a4b92340 | 1205 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1206 | { |
1207 | int ret; | |
cd9adb8b | 1208 | struct ltt_kernel_metadata *lkm = nullptr; |
aaf26714 | 1209 | |
a0377dfe | 1210 | LTTNG_ASSERT(session); |
0525e9ae | 1211 | |
54012638 | 1212 | /* Allocate kernel metadata */ |
a4b92340 | 1213 | lkm = trace_kernel_create_metadata(); |
cd9adb8b | 1214 | if (lkm == nullptr) { |
aaf26714 DG |
1215 | goto error; |
1216 | } | |
1217 | ||
54012638 | 1218 | /* Kernel tracer metadata creation */ |
f3ed775e | 1219 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1220 | if (ret < 0) { |
74024a21 | 1221 | goto error_open; |
aaf26714 DG |
1222 | } |
1223 | ||
8c0faa1d | 1224 | lkm->fd = ret; |
d40f0359 | 1225 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1226 | /* Prevent fd duplication after execlp() */ |
1227 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1228 | if (ret < 0) { | |
df0f840b | 1229 | PERROR("fcntl session fd"); |
7b395890 DG |
1230 | } |
1231 | ||
aaf26714 | 1232 | session->metadata = lkm; |
8c0faa1d | 1233 | |
00e2e675 | 1234 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1235 | |
1236 | return 0; | |
1237 | ||
74024a21 DG |
1238 | error_open: |
1239 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1240 | error: |
54012638 | 1241 | return -1; |
8c0faa1d DG |
1242 | } |
1243 | ||
1244 | /* | |
050349bb | 1245 | * Start tracing session. |
8c0faa1d DG |
1246 | */ |
1247 | int kernel_start_session(struct ltt_kernel_session *session) | |
1248 | { | |
1249 | int ret; | |
1250 | ||
a0377dfe | 1251 | LTTNG_ASSERT(session); |
0525e9ae | 1252 | |
8c0faa1d DG |
1253 | ret = kernctl_start_session(session->fd); |
1254 | if (ret < 0) { | |
df0f840b | 1255 | PERROR("ioctl start session"); |
8c0faa1d DG |
1256 | goto error; |
1257 | } | |
1258 | ||
1259 | DBG("Kernel session started"); | |
1260 | ||
1261 | return 0; | |
1262 | ||
1263 | error: | |
1264 | return ret; | |
1265 | } | |
1266 | ||
f3ed775e | 1267 | /* |
050349bb | 1268 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1269 | */ |
cd9adb8b | 1270 | void kernel_wait_quiescent() |
f3ed775e DG |
1271 | { |
1272 | int ret; | |
7d268848 | 1273 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1274 | |
1275 | DBG("Kernel quiescent wait on %d", fd); | |
1276 | ||
1277 | ret = kernctl_wait_quiescent(fd); | |
1278 | if (ret < 0) { | |
df0f840b | 1279 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1280 | ERR("Kernel quiescent wait failed"); |
1281 | } | |
1282 | } | |
1283 | ||
1284 | /* | |
f3ed775e DG |
1285 | * Force flush buffer of metadata. |
1286 | */ | |
1287 | int kernel_metadata_flush_buffer(int fd) | |
1288 | { | |
1289 | int ret; | |
1290 | ||
169d2cb7 DG |
1291 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1292 | ||
f3ed775e DG |
1293 | ret = kernctl_buffer_flush(fd); |
1294 | if (ret < 0) { | |
00e2e675 | 1295 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1296 | } |
1297 | ||
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | /* | |
050349bb | 1302 | * Force flush buffer for channel. |
f3ed775e DG |
1303 | */ |
1304 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1305 | { | |
1306 | int ret; | |
1307 | struct ltt_kernel_stream *stream; | |
1308 | ||
a0377dfe | 1309 | LTTNG_ASSERT(channel); |
0525e9ae | 1310 | |
f3ed775e DG |
1311 | DBG("Flush buffer for channel %s", channel->channel->name); |
1312 | ||
28ab034a | 1313 | cds_list_for_each_entry (stream, &channel->stream_list.head, list) { |
f3ed775e DG |
1314 | DBG("Flushing channel stream %d", stream->fd); |
1315 | ret = kernctl_buffer_flush(stream->fd); | |
1316 | if (ret < 0) { | |
df0f840b | 1317 | PERROR("ioctl"); |
28ab034a | 1318 | ERR("Fail to flush buffer for stream %d (ret: %d)", stream->fd, ret); |
f3ed775e DG |
1319 | } |
1320 | } | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
8c0faa1d | 1325 | /* |
050349bb | 1326 | * Stop tracing session. |
8c0faa1d DG |
1327 | */ |
1328 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1329 | { | |
1330 | int ret; | |
1331 | ||
a0377dfe | 1332 | LTTNG_ASSERT(session); |
0525e9ae | 1333 | |
8c0faa1d DG |
1334 | ret = kernctl_stop_session(session->fd); |
1335 | if (ret < 0) { | |
1336 | goto error; | |
1337 | } | |
1338 | ||
1339 | DBG("Kernel session stopped"); | |
1340 | ||
1341 | return 0; | |
1342 | ||
1343 | error: | |
1344 | return ret; | |
1345 | } | |
1346 | ||
1347 | /* | |
050349bb DG |
1348 | * Open stream of channel, register it to the kernel tracer and add it |
1349 | * to the stream list of the channel. | |
8c0faa1d | 1350 | * |
1cfb4b98 MD |
1351 | * Note: given that the streams may appear in random order wrt CPU |
1352 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1353 | * the stream name is not necessarily linked to the CPU number. | |
1354 | * | |
050349bb | 1355 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1356 | */ |
f3ed775e | 1357 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1358 | { |
1cfb4b98 | 1359 | int ret; |
8c0faa1d DG |
1360 | struct ltt_kernel_stream *lks; |
1361 | ||
a0377dfe | 1362 | LTTNG_ASSERT(channel); |
0525e9ae | 1363 | |
5a47c6a2 | 1364 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
28ab034a | 1365 | lks = trace_kernel_create_stream(channel->channel->name, channel->stream_count); |
cd9adb8b | 1366 | if (lks == nullptr) { |
799e2c4f MD |
1367 | ret = close(ret); |
1368 | if (ret) { | |
1369 | PERROR("close"); | |
1370 | } | |
8c0faa1d DG |
1371 | goto error; |
1372 | } | |
1373 | ||
1374 | lks->fd = ret; | |
7b395890 DG |
1375 | /* Prevent fd duplication after execlp() */ |
1376 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1377 | if (ret < 0) { | |
df0f840b | 1378 | PERROR("fcntl session fd"); |
7b395890 DG |
1379 | } |
1380 | ||
1624d5b7 JD |
1381 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1382 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1383 | ||
1cfb4b98 | 1384 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1385 | cds_list_add(&lks->list, &channel->stream_list.head); |
1386 | channel->stream_count++; | |
8c0faa1d | 1387 | |
28ab034a | 1388 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, lks->state); |
54012638 | 1389 | } |
8c0faa1d DG |
1390 | |
1391 | return channel->stream_count; | |
1392 | ||
1393 | error: | |
54012638 | 1394 | return -1; |
8c0faa1d DG |
1395 | } |
1396 | ||
1397 | /* | |
050349bb | 1398 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1399 | */ |
f3ed775e | 1400 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1401 | { |
1402 | int ret; | |
1403 | ||
a0377dfe | 1404 | LTTNG_ASSERT(session); |
0525e9ae | 1405 | |
8c0faa1d DG |
1406 | ret = kernctl_create_stream(session->metadata->fd); |
1407 | if (ret < 0) { | |
df0f840b | 1408 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1409 | goto error; |
1410 | } | |
1411 | ||
1412 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1413 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1414 | /* Prevent fd duplication after execlp() */ |
1415 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1416 | if (ret < 0) { | |
df0f840b | 1417 | PERROR("fcntl session fd"); |
7b395890 | 1418 | } |
aaf26714 DG |
1419 | |
1420 | return 0; | |
1421 | ||
1422 | error: | |
54012638 | 1423 | return -1; |
aaf26714 | 1424 | } |
2ef84c95 DG |
1425 | |
1426 | /* | |
9f19cc17 | 1427 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1428 | */ |
7d268848 | 1429 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1430 | { |
53efb85a | 1431 | int fd, ret; |
9f19cc17 DG |
1432 | char *event; |
1433 | size_t nbmem, count = 0; | |
2ef84c95 | 1434 | FILE *fp; |
9f19cc17 | 1435 | struct lttng_event *elist; |
2ef84c95 | 1436 | |
a0377dfe | 1437 | LTTNG_ASSERT(events); |
0525e9ae | 1438 | |
7d268848 | 1439 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1440 | if (fd < 0) { |
df0f840b | 1441 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1442 | goto error; |
1443 | } | |
1444 | ||
1445 | fp = fdopen(fd, "r"); | |
cd9adb8b | 1446 | if (fp == nullptr) { |
df0f840b | 1447 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1448 | goto error_fp; |
2ef84c95 DG |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * Init memory size counter | |
1453 | * See kernel-ctl.h for explanation of this value | |
1454 | */ | |
6725fe19 | 1455 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
64803277 | 1456 | elist = calloc<lttng_event>(nbmem); |
cd9adb8b | 1457 | if (elist == nullptr) { |
3b870559 MD |
1458 | PERROR("alloc list events"); |
1459 | count = -ENOMEM; | |
1460 | goto end; | |
1461 | } | |
2ef84c95 | 1462 | |
53efb85a | 1463 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1464 | if (count >= nbmem) { |
3b870559 | 1465 | struct lttng_event *new_elist; |
53efb85a | 1466 | size_t new_nbmem; |
3b870559 | 1467 | |
53efb85a | 1468 | new_nbmem = nbmem << 1; |
28ab034a JG |
1469 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, new_nbmem); |
1470 | new_elist = (lttng_event *) realloc(elist, | |
1471 | new_nbmem * sizeof(struct lttng_event)); | |
cd9adb8b | 1472 | if (new_elist == nullptr) { |
df0f840b | 1473 | PERROR("realloc list events"); |
3b870559 MD |
1474 | free(event); |
1475 | free(elist); | |
61b73b12 MD |
1476 | count = -ENOMEM; |
1477 | goto end; | |
2ef84c95 | 1478 | } |
53efb85a | 1479 | /* Zero the new memory */ |
28ab034a JG |
1480 | memset(new_elist + nbmem, |
1481 | 0, | |
1482 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
53efb85a | 1483 | nbmem = new_nbmem; |
3b870559 | 1484 | elist = new_elist; |
2ef84c95 | 1485 | } |
99497cd0 MD |
1486 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1487 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1488 | elist[count].enabled = -1; |
9f19cc17 | 1489 | count++; |
3b870559 | 1490 | free(event); |
2ef84c95 DG |
1491 | } |
1492 | ||
9f19cc17 | 1493 | *events = elist; |
ced2f820 | 1494 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1495 | end: |
28ab034a | 1496 | ret = fclose(fp); /* closes both fp and fd */ |
799e2c4f MD |
1497 | if (ret) { |
1498 | PERROR("fclose"); | |
1499 | } | |
9f19cc17 | 1500 | return count; |
2ef84c95 | 1501 | |
61b73b12 | 1502 | error_fp: |
799e2c4f MD |
1503 | ret = close(fd); |
1504 | if (ret) { | |
1505 | PERROR("close"); | |
1506 | } | |
2ef84c95 DG |
1507 | error: |
1508 | return -1; | |
1509 | } | |
096102bd DG |
1510 | |
1511 | /* | |
1512 | * Get kernel version and validate it. | |
1513 | */ | |
b8e2fb80 | 1514 | int kernel_validate_version(struct lttng_kernel_abi_tracer_version *version, |
28ab034a | 1515 | struct lttng_kernel_abi_tracer_abi_version *abi_version) |
096102bd DG |
1516 | { |
1517 | int ret; | |
096102bd | 1518 | |
7d268848 | 1519 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1520 | if (ret < 0) { |
521dd134 | 1521 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1522 | goto error; |
1523 | } | |
1524 | ||
1525 | /* Validate version */ | |
88076e89 | 1526 | if (version->major != VERSION_MAJOR) { |
c052142c | 1527 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
28ab034a JG |
1528 | version->major, |
1529 | VERSION_MAJOR); | |
096102bd | 1530 | goto error_version; |
096102bd | 1531 | } |
7d268848 | 1532 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1533 | if (ret < 0) { |
521dd134 | 1534 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1535 | goto error; |
1536 | } | |
b8e2fb80 | 1537 | if (abi_version->major != LTTNG_KERNEL_ABI_MAJOR_VERSION) { |
521dd134 | 1538 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
28ab034a JG |
1539 | abi_version->major, |
1540 | abi_version->minor, | |
1541 | LTTNG_KERNEL_ABI_MAJOR_VERSION); | |
c052142c MD |
1542 | goto error; |
1543 | } | |
1544 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
28ab034a JG |
1545 | version->major, |
1546 | version->minor, | |
1547 | abi_version->major, | |
1548 | abi_version->minor); | |
096102bd DG |
1549 | return 0; |
1550 | ||
1551 | error_version: | |
096102bd DG |
1552 | ret = -1; |
1553 | ||
1554 | error: | |
521dd134 | 1555 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1556 | return ret; |
1557 | } | |
335a95b7 MD |
1558 | |
1559 | /* | |
1560 | * Kernel work-arounds called at the start of sessiond main(). | |
1561 | */ | |
cd9adb8b | 1562 | int init_kernel_workarounds() |
335a95b7 | 1563 | { |
8936c33a | 1564 | int ret; |
335a95b7 MD |
1565 | FILE *fp; |
1566 | ||
1567 | /* | |
1568 | * boot_id needs to be read once before being used concurrently | |
1569 | * to deal with a Linux kernel race. A fix is proposed for | |
1570 | * upstream, but the work-around is needed for older kernels. | |
1571 | */ | |
1572 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1573 | if (!fp) { | |
1574 | goto end_boot_id; | |
1575 | } | |
1576 | while (!feof(fp)) { | |
1577 | char buf[37] = ""; | |
1578 | ||
8936c33a DG |
1579 | ret = fread(buf, 1, sizeof(buf), fp); |
1580 | if (ret < 0) { | |
1581 | /* Ignore error, we don't really care */ | |
1582 | } | |
335a95b7 | 1583 | } |
799e2c4f MD |
1584 | ret = fclose(fp); |
1585 | if (ret) { | |
1586 | PERROR("fclose"); | |
1587 | } | |
335a95b7 | 1588 | end_boot_id: |
335a95b7 MD |
1589 | return 0; |
1590 | } | |
2f77fc4b DG |
1591 | |
1592 | /* | |
d070c424 | 1593 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1594 | */ |
1595 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1596 | { | |
82b69413 JG |
1597 | struct lttng_trace_chunk *trace_chunk; |
1598 | ||
cd9adb8b | 1599 | if (ksess == nullptr) { |
2f77fc4b DG |
1600 | DBG3("No kernel session when tearing down session"); |
1601 | return; | |
1602 | } | |
1603 | ||
1604 | DBG("Tearing down kernel session"); | |
82b69413 | 1605 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1606 | |
07b86b52 | 1607 | /* |
15dc512a DG |
1608 | * Destroy channels on the consumer if at least one FD has been sent and we |
1609 | * are in no output mode because the streams are in *no* monitor mode so we | |
1610 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1611 | */ |
15dc512a | 1612 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1613 | int ret; |
1614 | struct consumer_socket *socket; | |
1615 | struct lttng_ht_iter iter; | |
1616 | ||
1617 | /* For each consumer socket. */ | |
56047f5a JG |
1618 | lttng::urcu::read_lock_guard read_lock; |
1619 | ||
28ab034a JG |
1620 | cds_lfht_for_each_entry ( |
1621 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
07b86b52 JD |
1622 | struct ltt_kernel_channel *chan; |
1623 | ||
1624 | /* For each channel, ask the consumer to destroy it. */ | |
28ab034a | 1625 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
07b86b52 JD |
1626 | ret = kernel_consumer_destroy_channel(socket, chan); |
1627 | if (ret < 0) { | |
1628 | /* Consumer is probably dead. Use next socket. */ | |
1629 | continue; | |
1630 | } | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | ||
2f77fc4b DG |
1635 | /* Close any relayd session */ |
1636 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1637 | ||
1638 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1639 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1640 | } |
fb5f35b6 | 1641 | |
d070c424 MD |
1642 | /* Teardown of data required by destroy notifiers. */ |
1643 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1644 | { | |
cd9adb8b | 1645 | if (ksess == nullptr) { |
d070c424 MD |
1646 | return; |
1647 | } | |
1648 | trace_kernel_free_session(ksess); | |
1649 | } | |
1650 | ||
fb5f35b6 DG |
1651 | /* |
1652 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1653 | */ | |
1654 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1655 | { | |
cd9adb8b | 1656 | struct ltt_kernel_session *ksess = nullptr; |
fb5f35b6 | 1657 | |
a0377dfe FD |
1658 | LTTNG_ASSERT(kchan); |
1659 | LTTNG_ASSERT(kchan->channel); | |
fb5f35b6 DG |
1660 | |
1661 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1662 | ||
1663 | /* Update channel count of associated session. */ | |
1664 | if (kchan->session) { | |
1665 | /* Keep pointer reference so we can update it after the destroy. */ | |
1666 | ksess = kchan->session; | |
1667 | } | |
1668 | ||
1669 | trace_kernel_destroy_channel(kchan); | |
1670 | ||
1671 | /* | |
1672 | * At this point the kernel channel is not visible anymore. This is safe | |
1673 | * since in order to work on a visible kernel session, the tracing session | |
1674 | * lock (ltt_session.lock) MUST be acquired. | |
1675 | */ | |
1676 | if (ksess) { | |
1677 | ksess->channel_count--; | |
1678 | } | |
1679 | } | |
6dc3064a DG |
1680 | |
1681 | /* | |
1682 | * Take a snapshot for a given kernel session. | |
1683 | * | |
9a654598 | 1684 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1685 | */ |
28ab034a JG |
1686 | enum lttng_error_code kernel_snapshot_record(struct ltt_kernel_session *ksess, |
1687 | const struct consumer_output *output, | |
1688 | uint64_t nb_packets_per_stream) | |
6dc3064a | 1689 | { |
2a06df8d | 1690 | int err, ret, saved_metadata_fd; |
9a654598 | 1691 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1692 | struct consumer_socket *socket; |
1693 | struct lttng_ht_iter iter; | |
1694 | struct ltt_kernel_metadata *saved_metadata; | |
cd9adb8b | 1695 | char *trace_path = nullptr; |
5da88b0f | 1696 | size_t consumer_path_offset = 0; |
6dc3064a | 1697 | |
a0377dfe FD |
1698 | LTTNG_ASSERT(ksess); |
1699 | LTTNG_ASSERT(ksess->consumer); | |
1700 | LTTNG_ASSERT(output); | |
6dc3064a DG |
1701 | |
1702 | DBG("Kernel snapshot record started"); | |
1703 | ||
1704 | /* Save current metadata since the following calls will change it. */ | |
1705 | saved_metadata = ksess->metadata; | |
1706 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1707 | ||
6dc3064a DG |
1708 | ret = kernel_open_metadata(ksess); |
1709 | if (ret < 0) { | |
9a654598 | 1710 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1711 | goto error; |
1712 | } | |
1713 | ||
1714 | ret = kernel_open_metadata_stream(ksess); | |
1715 | if (ret < 0) { | |
9a654598 | 1716 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1717 | goto error_open_stream; |
1718 | } | |
1719 | ||
28ab034a | 1720 | trace_path = setup_channel_trace_path(ksess->consumer, "", &consumer_path_offset); |
3b967712 MD |
1721 | if (!trace_path) { |
1722 | status = LTTNG_ERR_INVALID; | |
1723 | goto error; | |
1724 | } | |
6dc3064a | 1725 | |
56047f5a JG |
1726 | { |
1727 | /* Send metadata to consumer and snapshot everything. */ | |
1728 | lttng::urcu::read_lock_guard read_lock; | |
6dc3064a | 1729 | |
56047f5a JG |
1730 | cds_lfht_for_each_entry (output->socks->ht, &iter.iter, socket, node.node) { |
1731 | struct ltt_kernel_channel *chan; | |
1732 | ||
1733 | pthread_mutex_lock(socket->lock); | |
1734 | /* This stream must not be monitored by the consumer. */ | |
1735 | ret = kernel_consumer_add_metadata(socket, ksess, 0); | |
1736 | pthread_mutex_unlock(socket->lock); | |
1737 | if (ret < 0) { | |
1738 | status = LTTNG_ERR_KERN_META_FAIL; | |
1739 | goto error_consumer; | |
1740 | } | |
1741 | ||
1742 | /* For each channel, ask the consumer to snapshot it. */ | |
1743 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
1744 | status = | |
1745 | consumer_snapshot_channel(socket, | |
1746 | chan->key, | |
1747 | output, | |
1748 | 0, | |
1749 | &trace_path[consumer_path_offset], | |
1750 | nb_packets_per_stream); | |
1751 | if (status != LTTNG_OK) { | |
1752 | (void) kernel_consumer_destroy_metadata(socket, | |
1753 | ksess->metadata); | |
1754 | goto error_consumer; | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | /* Snapshot metadata, */ | |
28ab034a | 1759 | status = consumer_snapshot_channel(socket, |
56047f5a | 1760 | ksess->metadata->key, |
28ab034a | 1761 | output, |
56047f5a | 1762 | 1, |
28ab034a | 1763 | &trace_path[consumer_path_offset], |
56047f5a | 1764 | 0); |
9a654598 | 1765 | if (status != LTTNG_OK) { |
6dc3064a DG |
1766 | goto error_consumer; |
1767 | } | |
6dc3064a | 1768 | |
56047f5a JG |
1769 | /* |
1770 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1771 | * it's not monitored on the consumer side. | |
1772 | */ | |
1773 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1774 | } |
1775 | } | |
1776 | ||
1777 | error_consumer: | |
1778 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1779 | err = close(ksess->metadata_stream_fd); |
1780 | if (err < 0) { | |
6dc3064a DG |
1781 | PERROR("close snapshot kernel"); |
1782 | } | |
1783 | ||
1784 | error_open_stream: | |
1785 | trace_kernel_destroy_metadata(ksess->metadata); | |
1786 | error: | |
1787 | /* Restore metadata state.*/ | |
1788 | ksess->metadata = saved_metadata; | |
1789 | ksess->metadata_stream_fd = saved_metadata_fd; | |
3b967712 | 1790 | free(trace_path); |
9a654598 | 1791 | return status; |
6dc3064a | 1792 | } |
834978fd DG |
1793 | |
1794 | /* | |
1795 | * Get the syscall mask array from the kernel tracer. | |
1796 | * | |
1797 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1798 | * be freed. | |
1799 | */ | |
1800 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1801 | { | |
a0377dfe FD |
1802 | LTTNG_ASSERT(syscall_mask); |
1803 | LTTNG_ASSERT(nr_bits); | |
834978fd DG |
1804 | |
1805 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1806 | } | |
6e21424e | 1807 | |
28ab034a | 1808 | static int kernel_tracer_abi_greater_or_equal(unsigned int major, unsigned int minor) |
6e21424e | 1809 | { |
959e3c66 | 1810 | int ret; |
b8e2fb80 | 1811 | struct lttng_kernel_abi_tracer_abi_version abi; |
6e21424e | 1812 | |
7d268848 | 1813 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1814 | if (ret < 0) { |
1815 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1816 | goto error; | |
1817 | } | |
1818 | ||
959e3c66 JR |
1819 | ret = abi.major > major || (abi.major == major && abi.minor >= minor); |
1820 | error: | |
1821 | return ret; | |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1826 | * 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_ring_buffer_snapshot_sample_positions() |
959e3c66 | 1832 | { |
6e21424e JR |
1833 | /* |
1834 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1835 | */ | |
959e3c66 | 1836 | return kernel_tracer_abi_greater_or_equal(2, 3); |
6e21424e | 1837 | } |
5c408ad8 | 1838 | |
a40a503f MD |
1839 | /* |
1840 | * Check for the support of the packet sequence number via abi version number. | |
1841 | * | |
1842 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1843 | * of errors. | |
1844 | */ | |
cd9adb8b | 1845 | int kernel_supports_ring_buffer_packet_sequence_number() |
a40a503f | 1846 | { |
a40a503f | 1847 | /* |
3029bc92 JG |
1848 | * Packet sequence number was introduced in LTTng 2.8, |
1849 | * lttng-modules ABI 2.1. | |
a40a503f | 1850 | */ |
959e3c66 JR |
1851 | return kernel_tracer_abi_greater_or_equal(2, 1); |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * Check for the support of event notifiers via abi version number. | |
1856 | * | |
1857 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1858 | * of errors. | |
1859 | */ | |
cd9adb8b | 1860 | int kernel_supports_event_notifiers() |
959e3c66 JR |
1861 | { |
1862 | /* | |
1863 | * Event notifiers were introduced in LTTng 2.13, lttng-modules ABI 2.6. | |
1864 | */ | |
1865 | return kernel_tracer_abi_greater_or_equal(2, 6); | |
a40a503f MD |
1866 | } |
1867 | ||
5c408ad8 JD |
1868 | /* |
1869 | * Rotate a kernel session. | |
1870 | * | |
d5a1b7aa | 1871 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1872 | */ |
d5a1b7aa | 1873 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1874 | { |
1875 | int ret; | |
d5a1b7aa | 1876 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1877 | struct consumer_socket *socket; |
1878 | struct lttng_ht_iter iter; | |
1879 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1880 | ||
a0377dfe FD |
1881 | LTTNG_ASSERT(ksess); |
1882 | LTTNG_ASSERT(ksess->consumer); | |
5c408ad8 | 1883 | |
28ab034a | 1884 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", session->name, session->id); |
5c408ad8 | 1885 | |
56047f5a JG |
1886 | { |
1887 | /* | |
1888 | * Note that this loop will end after one iteration given that there is | |
1889 | * only one kernel consumer. | |
1890 | */ | |
1891 | lttng::urcu::read_lock_guard read_lock; | |
5c408ad8 | 1892 | |
56047f5a JG |
1893 | cds_lfht_for_each_entry ( |
1894 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
1895 | struct ltt_kernel_channel *chan; | |
1896 | ||
1897 | /* For each channel, ask the consumer to rotate it. */ | |
1898 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
1899 | DBG("Rotate kernel channel %" PRIu64 ", session %s", | |
1900 | chan->key, | |
1901 | session->name); | |
1902 | ret = consumer_rotate_channel(socket, | |
1903 | chan->key, | |
1904 | ksess->consumer, | |
1905 | /* is_metadata_channel */ false); | |
1906 | if (ret < 0) { | |
1907 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
1908 | goto error; | |
1909 | } | |
1910 | } | |
1911 | ||
1912 | /* | |
1913 | * Rotate the metadata channel. | |
1914 | */ | |
28ab034a | 1915 | ret = consumer_rotate_channel(socket, |
56047f5a | 1916 | ksess->metadata->key, |
28ab034a | 1917 | ksess->consumer, |
56047f5a | 1918 | /* is_metadata_channel */ true); |
5c408ad8 | 1919 | if (ret < 0) { |
7e0de219 | 1920 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1921 | goto error; |
1922 | } | |
1923 | } | |
5c408ad8 JD |
1924 | } |
1925 | ||
5c408ad8 | 1926 | error: |
d5a1b7aa | 1927 | return status; |
5c408ad8 | 1928 | } |
d2956687 | 1929 | |
28ab034a | 1930 | enum lttng_error_code kernel_create_channel_subdirectories(const struct ltt_kernel_session *ksess) |
d2956687 JG |
1931 | { |
1932 | enum lttng_error_code ret = LTTNG_OK; | |
1933 | enum lttng_trace_chunk_status chunk_status; | |
1934 | ||
56047f5a | 1935 | lttng::urcu::read_lock_guard read_lock; |
a0377dfe | 1936 | LTTNG_ASSERT(ksess->current_trace_chunk); |
d2956687 JG |
1937 | |
1938 | /* | |
1939 | * Create the index subdirectory which will take care | |
1940 | * of implicitly creating the channel's path. | |
1941 | */ | |
1942 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
28ab034a | 1943 | ksess->current_trace_chunk, DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); |
d2956687 JG |
1944 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
1945 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1946 | goto error; | |
1947 | } | |
1948 | error: | |
d2956687 JG |
1949 | return ret; |
1950 | } | |
7d268848 MD |
1951 | |
1952 | /* | |
1953 | * Setup necessary data for kernel tracer action. | |
1954 | */ | |
cd9adb8b | 1955 | int init_kernel_tracer() |
7d268848 MD |
1956 | { |
1957 | int ret; | |
1958 | bool is_root = !getuid(); | |
1959 | ||
1960 | /* Modprobe lttng kernel modules */ | |
1961 | ret = modprobe_lttng_control(); | |
1962 | if (ret < 0) { | |
1963 | goto error; | |
1964 | } | |
1965 | ||
1966 | /* Open debugfs lttng */ | |
1967 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1968 | if (kernel_tracer_fd < 0) { | |
1969 | DBG("Failed to open %s", module_proc_lttng); | |
1970 | goto error_open; | |
1971 | } | |
1972 | ||
1973 | /* Validate kernel version */ | |
28ab034a | 1974 | ret = kernel_validate_version(&the_kernel_tracer_version, &the_kernel_tracer_abi_version); |
7d268848 MD |
1975 | if (ret < 0) { |
1976 | goto error_version; | |
1977 | } | |
1978 | ||
1979 | ret = modprobe_lttng_data(); | |
1980 | if (ret < 0) { | |
1981 | goto error_modules; | |
1982 | } | |
1983 | ||
1984 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1985 | if (ret < 0) { | |
1986 | goto error_modules; | |
1987 | } | |
7d268848 MD |
1988 | if (ret < 1) { |
1989 | WARN("Kernel tracer does not support buffer monitoring. " | |
28ab034a JG |
1990 | "The monitoring timer of channels in the kernel domain " |
1991 | "will be set to 0 (disabled)."); | |
7d268848 MD |
1992 | } |
1993 | ||
352b58f5 JR |
1994 | ret = kernel_supports_event_notifiers(); |
1995 | if (ret < 0) { | |
1996 | ERR("Failed to check for kernel tracer event notifier support"); | |
1997 | goto error_modules; | |
1998 | } | |
1999 | ret = kernel_create_event_notifier_group(&kernel_tracer_event_notifier_group_fd); | |
2000 | if (ret < 0) { | |
2001 | /* This is not fatal. */ | |
2002 | WARN("Failed to create kernel event notifier group"); | |
2003 | kernel_tracer_event_notifier_group_fd = -1; | |
2004 | } else { | |
90aa04a1 FD |
2005 | enum event_notifier_error_accounting_status error_accounting_status; |
2006 | enum lttng_error_code error_code_ret = | |
28ab034a JG |
2007 | kernel_create_event_notifier_group_notification_fd( |
2008 | &kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
2009 | |
2010 | if (error_code_ret != LTTNG_OK) { | |
2011 | goto error_modules; | |
2012 | } | |
2013 | ||
90aa04a1 | 2014 | error_accounting_status = event_notifier_error_accounting_register_kernel( |
28ab034a | 2015 | kernel_tracer_event_notifier_group_fd); |
90aa04a1 FD |
2016 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
2017 | ERR("Failed to initialize event notifier error accounting for kernel tracer"); | |
2018 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING; | |
2019 | goto error_modules; | |
2020 | } | |
2021 | ||
352b58f5 | 2022 | kernel_token_to_event_notifier_rule_ht = cds_lfht_new( |
cd9adb8b | 2023 | DEFAULT_HT_SIZE, 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, nullptr); |
352b58f5 JR |
2024 | if (!kernel_token_to_event_notifier_rule_ht) { |
2025 | goto error_token_ht; | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | DBG("Kernel tracer initialized: kernel tracer fd = %d, event notifier group fd = %d, event notifier group notification fd = %d", | |
28ab034a JG |
2030 | kernel_tracer_fd, |
2031 | kernel_tracer_event_notifier_group_fd, | |
2032 | kernel_tracer_event_notifier_group_notification_fd); | |
7d268848 MD |
2033 | |
2034 | ret = syscall_init_table(kernel_tracer_fd); | |
2035 | if (ret < 0) { | |
2036 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
28ab034a | 2037 | "work for this session daemon."); |
7d268848 | 2038 | } |
352b58f5 | 2039 | |
7d268848 MD |
2040 | return 0; |
2041 | ||
2042 | error_version: | |
2043 | modprobe_remove_lttng_control(); | |
2044 | ret = close(kernel_tracer_fd); | |
2045 | if (ret) { | |
28ab034a | 2046 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 | 2047 | } |
6dcf80d3 | 2048 | |
7d268848 MD |
2049 | kernel_tracer_fd = -1; |
2050 | return LTTNG_ERR_KERN_VERSION; | |
2051 | ||
352b58f5 JR |
2052 | error_token_ht: |
2053 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2054 | if (ret) { | |
2055 | PERROR("Failed to close kernel tracer event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2056 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2057 | } |
2058 | ||
6dcf80d3 JG |
2059 | kernel_tracer_event_notifier_group_notification_fd = -1; |
2060 | ||
7d268848 | 2061 | error_modules: |
352b58f5 JR |
2062 | ret = close(kernel_tracer_event_notifier_group_fd); |
2063 | if (ret) { | |
2064 | PERROR("Failed to close kernel tracer event notifier group file descriptor: fd = %d", | |
28ab034a | 2065 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2066 | } |
2067 | ||
6dcf80d3 JG |
2068 | kernel_tracer_event_notifier_group_fd = -1; |
2069 | ||
7d268848 MD |
2070 | ret = close(kernel_tracer_fd); |
2071 | if (ret) { | |
28ab034a | 2072 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 MD |
2073 | } |
2074 | ||
6dcf80d3 JG |
2075 | kernel_tracer_fd = -1; |
2076 | ||
7d268848 MD |
2077 | error_open: |
2078 | modprobe_remove_lttng_control(); | |
2079 | ||
2080 | error: | |
2081 | WARN("No kernel tracer available"); | |
2082 | kernel_tracer_fd = -1; | |
2083 | if (!is_root) { | |
2084 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2085 | } else { | |
2086 | return LTTNG_ERR_KERN_NA; | |
2087 | } | |
2088 | } | |
2089 | ||
cd9adb8b | 2090 | void cleanup_kernel_tracer() |
7d268848 | 2091 | { |
352b58f5 JR |
2092 | DBG2("Closing kernel event notifier group notification file descriptor"); |
2093 | if (kernel_tracer_event_notifier_group_notification_fd >= 0) { | |
b69a1b40 | 2094 | int ret = notification_thread_command_remove_tracer_event_source( |
28ab034a JG |
2095 | the_notification_thread_handle, |
2096 | kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
2097 | if (ret != LTTNG_OK) { |
2098 | ERR("Failed to remove kernel event notifier notification from notification thread"); | |
2099 | } | |
2100 | ||
2101 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2102 | if (ret) { | |
2103 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2104 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2105 | } |
2106 | ||
2107 | kernel_tracer_event_notifier_group_notification_fd = -1; | |
2108 | } | |
2109 | ||
2110 | if (kernel_token_to_event_notifier_rule_ht) { | |
cd9adb8b | 2111 | const int ret = cds_lfht_destroy(kernel_token_to_event_notifier_rule_ht, nullptr); |
a0377dfe | 2112 | LTTNG_ASSERT(ret == 0); |
352b58f5 JR |
2113 | } |
2114 | ||
2115 | DBG2("Closing kernel event notifier group file descriptor"); | |
2116 | if (kernel_tracer_event_notifier_group_fd >= 0) { | |
b69a1b40 JG |
2117 | const int ret = close(kernel_tracer_event_notifier_group_fd); |
2118 | ||
352b58f5 JR |
2119 | if (ret) { |
2120 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 2121 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2122 | } |
2123 | ||
2124 | kernel_tracer_event_notifier_group_fd = -1; | |
2125 | } | |
7d268848 MD |
2126 | |
2127 | DBG2("Closing kernel fd"); | |
2128 | if (kernel_tracer_fd >= 0) { | |
b69a1b40 JG |
2129 | const int ret = close(kernel_tracer_fd); |
2130 | ||
7d268848 | 2131 | if (ret) { |
352b58f5 | 2132 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
28ab034a | 2133 | kernel_tracer_fd); |
7d268848 | 2134 | } |
352b58f5 | 2135 | |
7d268848 MD |
2136 | kernel_tracer_fd = -1; |
2137 | } | |
352b58f5 | 2138 | |
7d268848 MD |
2139 | free(syscall_table); |
2140 | } | |
2141 | ||
cd9adb8b | 2142 | bool kernel_tracer_is_initialized() |
7d268848 MD |
2143 | { |
2144 | return kernel_tracer_fd >= 0; | |
2145 | } | |
bca212a2 MD |
2146 | |
2147 | /* | |
2148 | * Clear a kernel session. | |
2149 | * | |
2150 | * Return LTTNG_OK on success or else an LTTng error code. | |
2151 | */ | |
2152 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2153 | { | |
2154 | int ret; | |
2155 | enum lttng_error_code status = LTTNG_OK; | |
2156 | struct consumer_socket *socket; | |
2157 | struct lttng_ht_iter iter; | |
2158 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2159 | ||
a0377dfe FD |
2160 | LTTNG_ASSERT(ksess); |
2161 | LTTNG_ASSERT(ksess->consumer); | |
bca212a2 | 2162 | |
28ab034a | 2163 | DBG("Clear kernel session %s (session %" PRIu64 ")", session->name, session->id); |
bca212a2 | 2164 | |
bca212a2 MD |
2165 | if (ksess->active) { |
2166 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2167 | status = LTTNG_ERR_FATAL; | |
2168 | goto end; | |
2169 | } | |
2170 | ||
56047f5a JG |
2171 | { |
2172 | /* | |
2173 | * Note that this loop will end after one iteration given that there is | |
2174 | * only one kernel consumer. | |
2175 | */ | |
2176 | lttng::urcu::read_lock_guard read_lock; | |
2177 | ||
2178 | cds_lfht_for_each_entry ( | |
2179 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
2180 | struct ltt_kernel_channel *chan; | |
2181 | ||
2182 | /* For each channel, ask the consumer to clear it. */ | |
2183 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
2184 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
2185 | chan->key, | |
2186 | session->name); | |
2187 | ret = consumer_clear_channel(socket, chan->key); | |
2188 | if (ret < 0) { | |
2189 | goto error; | |
2190 | } | |
2191 | } | |
2192 | ||
2193 | if (!ksess->metadata) { | |
2194 | /* | |
2195 | * Nothing to do for the metadata. | |
2196 | * This is a snapshot session. | |
2197 | * The metadata is genererated on the fly. | |
2198 | */ | |
2199 | continue; | |
bca212a2 | 2200 | } |
bca212a2 | 2201 | |
bca212a2 | 2202 | /* |
56047f5a JG |
2203 | * Clear the metadata channel. |
2204 | * Metadata channel is not cleared per se but we still need to | |
2205 | * perform a rotation operation on it behind the scene. | |
bca212a2 | 2206 | */ |
56047f5a JG |
2207 | ret = consumer_clear_channel(socket, ksess->metadata->key); |
2208 | if (ret < 0) { | |
2209 | goto error; | |
2210 | } | |
bca212a2 MD |
2211 | } |
2212 | } | |
2213 | ||
2214 | goto end; | |
2215 | error: | |
2216 | switch (-ret) { | |
2217 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
28ab034a JG |
2218 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; |
2219 | break; | |
bca212a2 | 2220 | default: |
28ab034a JG |
2221 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; |
2222 | break; | |
bca212a2 MD |
2223 | } |
2224 | end: | |
bca212a2 MD |
2225 | return status; |
2226 | } | |
352b58f5 | 2227 | |
28ab034a JG |
2228 | enum lttng_error_code |
2229 | kernel_create_event_notifier_group_notification_fd(int *event_notifier_group_notification_fd) | |
352b58f5 JR |
2230 | { |
2231 | int local_fd = -1, ret; | |
2232 | enum lttng_error_code error_code_ret; | |
2233 | ||
a0377dfe | 2234 | LTTNG_ASSERT(event_notifier_group_notification_fd); |
352b58f5 JR |
2235 | |
2236 | ret = kernctl_create_event_notifier_group_notification_fd( | |
28ab034a | 2237 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2238 | if (ret < 0) { |
2239 | PERROR("Failed to create kernel event notifier group notification file descriptor"); | |
2240 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2241 | goto error; | |
2242 | } | |
2243 | ||
2244 | local_fd = ret; | |
2245 | ||
2246 | /* Prevent fd duplication after execlp(). */ | |
2247 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2248 | if (ret < 0) { | |
2249 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2250 | local_fd); |
352b58f5 JR |
2251 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; |
2252 | goto error; | |
2253 | } | |
2254 | ||
28ab034a | 2255 | DBG("Created kernel notifier group notification file descriptor: fd = %d", local_fd); |
352b58f5 JR |
2256 | error_code_ret = LTTNG_OK; |
2257 | *event_notifier_group_notification_fd = local_fd; | |
2258 | local_fd = -1; | |
2259 | ||
2260 | error: | |
2261 | if (local_fd >= 0) { | |
2262 | ret = close(local_fd); | |
2263 | if (ret) { | |
2264 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2265 | local_fd); |
352b58f5 JR |
2266 | } |
2267 | } | |
2268 | ||
2269 | return error_code_ret; | |
2270 | } | |
2271 | ||
28ab034a JG |
2272 | enum lttng_error_code |
2273 | kernel_destroy_event_notifier_group_notification_fd(int event_notifier_group_notification_fd) | |
352b58f5 JR |
2274 | { |
2275 | enum lttng_error_code ret_code = LTTNG_OK; | |
2276 | ||
2277 | DBG("Closing event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2278 | event_notifier_group_notification_fd); |
352b58f5 JR |
2279 | if (event_notifier_group_notification_fd >= 0) { |
2280 | const int ret = close(event_notifier_group_notification_fd); | |
2281 | if (ret) { | |
2282 | PERROR("Failed to close event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2283 | event_notifier_group_notification_fd); |
352b58f5 JR |
2284 | } |
2285 | } | |
2286 | ||
2287 | return ret_code; | |
2288 | } | |
2289 | ||
28ab034a | 2290 | static unsigned long hash_trigger(const struct lttng_trigger *trigger) |
352b58f5 | 2291 | { |
28ab034a | 2292 | const struct lttng_condition *condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2293 | |
2294 | return lttng_condition_hash(condition); | |
2295 | } | |
2296 | ||
28ab034a | 2297 | static int match_trigger(struct cds_lfht_node *node, const void *key) |
352b58f5 JR |
2298 | { |
2299 | const struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
7966af57 | 2300 | const struct lttng_trigger *trigger = (lttng_trigger *) key; |
352b58f5 | 2301 | |
28ab034a JG |
2302 | event_notifier_rule = |
2303 | caa_container_of(node, const struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2304 | |
2305 | return lttng_trigger_is_equal(trigger, event_notifier_rule->trigger); | |
2306 | } | |
2307 | ||
2308 | static enum lttng_error_code kernel_create_event_notifier_rule( | |
28ab034a | 2309 | struct lttng_trigger *trigger, const struct lttng_credentials *creds, uint64_t token) |
352b58f5 JR |
2310 | { |
2311 | int err, fd, ret = 0; | |
2312 | enum lttng_error_code error_code_ret; | |
2313 | enum lttng_condition_status condition_status; | |
2314 | enum lttng_condition_type condition_type; | |
2315 | enum lttng_event_rule_type event_rule_type; | |
2316 | struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
b8e2fb80 | 2317 | struct lttng_kernel_abi_event_notifier kernel_event_notifier = {}; |
bbd6675c | 2318 | unsigned int capture_bytecode_count = 0, i; |
cd9adb8b JG |
2319 | const struct lttng_condition *condition = nullptr; |
2320 | const struct lttng_event_rule *event_rule = nullptr; | |
bbd6675c | 2321 | enum lttng_condition_status cond_status; |
352b58f5 | 2322 | |
a0377dfe | 2323 | LTTNG_ASSERT(trigger); |
352b58f5 JR |
2324 | |
2325 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 2326 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2327 | |
2328 | condition_type = lttng_condition_get_type(condition); | |
a0377dfe | 2329 | LTTNG_ASSERT(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
352b58f5 JR |
2330 | |
2331 | /* Does not acquire a reference. */ | |
28ab034a | 2332 | condition_status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe FD |
2333 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
2334 | LTTNG_ASSERT(event_rule); | |
352b58f5 JR |
2335 | |
2336 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
a0377dfe | 2337 | LTTNG_ASSERT(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); |
352b58f5 | 2338 | |
28ab034a JG |
2339 | error_code_ret = trace_kernel_create_event_notifier_rule( |
2340 | trigger, | |
2341 | token, | |
2342 | lttng_condition_event_rule_matches_get_error_counter_index(condition), | |
2343 | &event_notifier_rule); | |
352b58f5 JR |
2344 | if (error_code_ret != LTTNG_OK) { |
2345 | goto error; | |
2346 | } | |
2347 | ||
28ab034a JG |
2348 | error_code_ret = trace_kernel_init_event_notifier_from_event_rule(event_rule, |
2349 | &kernel_event_notifier); | |
352b58f5 | 2350 | if (error_code_ret != LTTNG_OK) { |
b5e3b044 | 2351 | goto free_event; |
352b58f5 JR |
2352 | } |
2353 | ||
2354 | kernel_event_notifier.event.token = event_notifier_rule->token; | |
90aa04a1 | 2355 | kernel_event_notifier.error_counter_idx = |
28ab034a | 2356 | lttng_condition_event_rule_matches_get_error_counter_index(condition); |
352b58f5 | 2357 | |
28ab034a JG |
2358 | fd = kernctl_create_event_notifier(kernel_tracer_event_notifier_group_fd, |
2359 | &kernel_event_notifier); | |
352b58f5 JR |
2360 | if (fd < 0) { |
2361 | switch (-fd) { | |
2362 | case EEXIST: | |
2363 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2364 | break; | |
2365 | case ENOSYS: | |
2366 | WARN("Failed to create kernel event notifier: not notifier type not implemented"); | |
2367 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2368 | break; | |
2369 | case ENOENT: | |
2370 | WARN("Failed to create kernel event notifier: not found: name = '%s'", | |
28ab034a | 2371 | kernel_event_notifier.event.name); |
352b58f5 JR |
2372 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2373 | break; | |
2374 | default: | |
2375 | PERROR("Failed to create kernel event notifier: error code = %d, name = '%s'", | |
28ab034a JG |
2376 | fd, |
2377 | kernel_event_notifier.event.name); | |
352b58f5 JR |
2378 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2379 | } | |
2380 | goto free_event; | |
2381 | } | |
2382 | ||
2383 | event_notifier_rule->fd = fd; | |
2384 | /* Prevent fd duplication after execlp(). */ | |
2385 | err = fcntl(event_notifier_rule->fd, F_SETFD, FD_CLOEXEC); | |
2386 | if (err < 0) { | |
2387 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier file descriptor: fd = %d", | |
28ab034a | 2388 | fd); |
352b58f5 JR |
2389 | error_code_ret = LTTNG_ERR_FATAL; |
2390 | goto set_cloexec_error; | |
2391 | } | |
2392 | ||
2393 | if (event_notifier_rule->filter) { | |
2394 | err = kernctl_filter(event_notifier_rule->fd, event_notifier_rule->filter); | |
2395 | if (err < 0) { | |
2396 | switch (-err) { | |
2397 | case ENOMEM: | |
2398 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2399 | break; | |
2400 | default: | |
2401 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2402 | break; | |
2403 | } | |
2404 | goto filter_error; | |
2405 | } | |
2406 | } | |
2407 | ||
28ab034a | 2408 | if (lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) { |
352b58f5 | 2409 | ret = userspace_probe_event_rule_add_callsites( |
28ab034a | 2410 | event_rule, creds, event_notifier_rule->fd); |
352b58f5 JR |
2411 | if (ret) { |
2412 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2413 | goto add_callsite_error; | |
2414 | } | |
2415 | } | |
2416 | ||
d602bd6a | 2417 | /* Set the capture bytecode if any. */ |
8dbb86b8 | 2418 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
28ab034a | 2419 | condition, &capture_bytecode_count); |
a0377dfe | 2420 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
bbd6675c JR |
2421 | |
2422 | for (i = 0; i < capture_bytecode_count; i++) { | |
2423 | const struct lttng_bytecode *capture_bytecode = | |
28ab034a JG |
2424 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index(condition, |
2425 | i); | |
bbd6675c | 2426 | |
cd9adb8b | 2427 | if (capture_bytecode == nullptr) { |
bbd6675c JR |
2428 | ERR("Unexpected NULL capture bytecode on condition"); |
2429 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2430 | goto capture_error; |
bbd6675c JR |
2431 | } |
2432 | ||
2433 | ret = kernctl_capture(event_notifier_rule->fd, capture_bytecode); | |
2434 | if (ret < 0) { | |
2435 | ERR("Failed to set capture bytecode on event notifier rule fd: fd = %d", | |
28ab034a | 2436 | event_notifier_rule->fd); |
bbd6675c | 2437 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
e8b1187d | 2438 | goto capture_error; |
bbd6675c JR |
2439 | } |
2440 | } | |
2441 | ||
352b58f5 JR |
2442 | err = kernctl_enable(event_notifier_rule->fd); |
2443 | if (err < 0) { | |
2444 | switch (-err) { | |
2445 | case EEXIST: | |
2446 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2447 | break; | |
2448 | default: | |
2449 | PERROR("enable kernel event notifier"); | |
2450 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2451 | break; | |
2452 | } | |
2453 | goto enable_error; | |
2454 | } | |
2455 | ||
2456 | /* Add trigger to kernel token mapping in the hash table. */ | |
56047f5a JG |
2457 | { |
2458 | lttng::urcu::read_lock_guard read_lock; | |
2459 | cds_lfht_add(kernel_token_to_event_notifier_rule_ht, | |
2460 | hash_trigger(trigger), | |
2461 | &event_notifier_rule->ht_node); | |
2462 | } | |
352b58f5 JR |
2463 | |
2464 | DBG("Created kernel event notifier: name = '%s', fd = %d", | |
28ab034a JG |
2465 | kernel_event_notifier.event.name, |
2466 | event_notifier_rule->fd); | |
352b58f5 JR |
2467 | |
2468 | return LTTNG_OK; | |
2469 | ||
e8b1187d | 2470 | capture_error: |
352b58f5 JR |
2471 | add_callsite_error: |
2472 | enable_error: | |
2473 | set_cloexec_error: | |
2474 | filter_error: | |
28ab034a JG |
2475 | { |
2476 | const int close_ret = close(event_notifier_rule->fd); | |
352b58f5 | 2477 | |
28ab034a JG |
2478 | if (close_ret) { |
2479 | PERROR("Failed to close kernel event notifier file descriptor: fd = %d", | |
2480 | event_notifier_rule->fd); | |
352b58f5 | 2481 | } |
28ab034a | 2482 | } |
352b58f5 JR |
2483 | free_event: |
2484 | free(event_notifier_rule); | |
2485 | error: | |
2486 | return error_code_ret; | |
2487 | } | |
2488 | ||
28ab034a JG |
2489 | enum lttng_error_code kernel_register_event_notifier(struct lttng_trigger *trigger, |
2490 | const struct lttng_credentials *cmd_creds) | |
352b58f5 JR |
2491 | { |
2492 | enum lttng_error_code ret; | |
2493 | enum lttng_condition_status status; | |
2494 | enum lttng_domain_type domain_type; | |
2495 | const struct lttng_event_rule *event_rule; | |
28ab034a | 2496 | const struct lttng_condition *const condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2497 | const uint64_t token = lttng_trigger_get_tracer_token(trigger); |
2498 | ||
a0377dfe | 2499 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2500 | |
2501 | /* Does not acquire a reference to the event rule. */ | |
28ab034a | 2502 | status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe | 2503 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
352b58f5 JR |
2504 | |
2505 | domain_type = lttng_event_rule_get_domain_type(event_rule); | |
a0377dfe | 2506 | LTTNG_ASSERT(domain_type == LTTNG_DOMAIN_KERNEL); |
352b58f5 JR |
2507 | |
2508 | ret = kernel_create_event_notifier_rule(trigger, cmd_creds, token); | |
2509 | if (ret != LTTNG_OK) { | |
124dda43 | 2510 | ERR("Failed to create kernel event notifier rule"); |
352b58f5 JR |
2511 | } |
2512 | ||
2513 | return ret; | |
2514 | } | |
2515 | ||
28ab034a | 2516 | enum lttng_error_code kernel_unregister_event_notifier(const struct lttng_trigger *trigger) |
352b58f5 JR |
2517 | { |
2518 | struct ltt_kernel_event_notifier_rule *token_event_rule_element; | |
2519 | struct cds_lfht_node *node; | |
2520 | struct cds_lfht_iter iter; | |
2521 | enum lttng_error_code error_code_ret; | |
2522 | int ret; | |
2523 | ||
56047f5a | 2524 | lttng::urcu::read_lock_guard read_lock; |
352b58f5 JR |
2525 | |
2526 | cds_lfht_lookup(kernel_token_to_event_notifier_rule_ht, | |
28ab034a JG |
2527 | hash_trigger(trigger), |
2528 | match_trigger, | |
2529 | trigger, | |
2530 | &iter); | |
352b58f5 JR |
2531 | |
2532 | node = cds_lfht_iter_get_node(&iter); | |
2533 | if (!node) { | |
2534 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2535 | goto error; | |
2536 | } | |
2537 | ||
28ab034a JG |
2538 | token_event_rule_element = |
2539 | caa_container_of(node, struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2540 | |
2541 | ret = kernel_disable_event_notifier_rule(token_event_rule_element); | |
2542 | if (ret) { | |
2543 | error_code_ret = LTTNG_ERR_FATAL; | |
2544 | goto error; | |
2545 | } | |
2546 | ||
2547 | trace_kernel_destroy_event_notifier_rule(token_event_rule_element); | |
2548 | error_code_ret = LTTNG_OK; | |
2549 | ||
2550 | error: | |
352b58f5 JR |
2551 | |
2552 | return error_code_ret; | |
2553 | } | |
2554 | ||
cd9adb8b | 2555 | int kernel_get_notification_fd() |
352b58f5 JR |
2556 | { |
2557 | return kernel_tracer_event_notifier_group_notification_fd; | |
2558 | } |