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" | |
19 | #include "rotate.hpp" | |
20 | #include "sessiond-config.hpp" | |
21 | #include "tracker.hpp" | |
22 | #include "utils.hpp" | |
20fe2104 | 23 | |
c9e313bc SM |
24 | #include <common/common.hpp> |
25 | #include <common/hashtable/utils.hpp> | |
c9e313bc SM |
26 | #include <common/kernel-ctl/kernel-ctl.hpp> |
27 | #include <common/kernel-ctl/kernel-ioctl.hpp> | |
28 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
28ab034a | 29 | #include <common/trace-chunk.hpp> |
c9e313bc | 30 | #include <common/tracker.hpp> |
56047f5a | 31 | #include <common/urcu.hpp> |
c9e313bc | 32 | #include <common/utils.hpp> |
1e307fab | 33 | |
c9e313bc | 34 | #include <lttng/condition/event-rule-matches-internal.hpp> |
28ab034a | 35 | #include <lttng/condition/event-rule-matches.h> |
c9e313bc | 36 | #include <lttng/event-rule/event-rule-internal.hpp> |
28ab034a | 37 | #include <lttng/event-rule/event-rule.h> |
c9e313bc | 38 | #include <lttng/event-rule/kernel-uprobe-internal.hpp> |
28ab034a JG |
39 | #include <lttng/event.h> |
40 | #include <lttng/lttng-error.h> | |
41 | #include <lttng/tracker.h> | |
42 | #include <lttng/userspace-probe-internal.hpp> | |
43 | #include <lttng/userspace-probe.h> | |
352b58f5 | 44 | |
28ab034a JG |
45 | #include <fcntl.h> |
46 | #include <inttypes.h> | |
47 | #include <stdio.h> | |
48 | #include <stdlib.h> | |
49 | #include <string.h> | |
50 | #include <sys/types.h> | |
51 | #include <unistd.h> | |
20fe2104 | 52 | |
e1f3997a JD |
53 | /* |
54 | * Key used to reference a channel between the sessiond and the consumer. This | |
55 | * is only read and updated with the session_list lock held. | |
56 | */ | |
57 | static uint64_t next_kernel_channel_key; | |
58 | ||
7d268848 MD |
59 | static const char *module_proc_lttng = "/proc/lttng"; |
60 | ||
61 | static int kernel_tracer_fd = -1; | |
352b58f5 JR |
62 | static int kernel_tracer_event_notifier_group_fd = -1; |
63 | static int kernel_tracer_event_notifier_group_notification_fd = -1; | |
64 | static struct cds_lfht *kernel_token_to_event_notifier_rule_ht; | |
7d268848 | 65 | |
56a9a0b7 OD |
66 | namespace { |
67 | /* | |
68 | * On some architectures, calling convention details are embedded in the symbol | |
69 | * addresses. Uprobe requires a "clean" symbol offset (or at least, an address | |
70 | * where an instruction boundary would be legal) to add | |
71 | * instrumentation. sanitize_uprobe_offset implements that sanitization logic on | |
72 | * a per-architecture basis. | |
73 | */ | |
74 | #if defined(__arm__) || defined(__aarch64__) | |
75 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
76 | { | |
77 | /* | |
78 | * The least significant bit is used when branching to switch to thumb | |
79 | * ISA. However, it's an invalid address for us; mask the least | |
80 | * significant bit. | |
81 | */ | |
82 | return raw_offset &= ~0b1; | |
83 | } | |
84 | #else /* defined(__arm__) || defined(__aarch64__) */ | |
85 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
86 | { | |
87 | return raw_offset; | |
88 | } | |
89 | #endif | |
90 | } | |
91 | ||
d65106b1 | 92 | /* |
050349bb | 93 | * Add context on a kernel channel. |
df3c77c8 JG |
94 | * |
95 | * Assumes the ownership of ctx. | |
d65106b1 | 96 | */ |
28ab034a | 97 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, struct ltt_kernel_context *ctx) |
d65106b1 DG |
98 | { |
99 | int ret; | |
100 | ||
a0377dfe FD |
101 | LTTNG_ASSERT(chan); |
102 | LTTNG_ASSERT(ctx); | |
0525e9ae | 103 | |
d65106b1 | 104 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 105 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 106 | if (ret < 0) { |
32af2c95 | 107 | switch (-ret) { |
1ae5e83e JD |
108 | case ENOSYS: |
109 | /* Exists but not available for this kernel */ | |
110 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
111 | goto error; | |
112 | case EEXIST: | |
b579acd9 DG |
113 | /* If EEXIST, we just ignore the error */ |
114 | ret = 0; | |
1ae5e83e JD |
115 | goto end; |
116 | default: | |
117 | PERROR("add context ioctl"); | |
118 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
119 | goto error; | |
b579acd9 | 120 | } |
d65106b1 | 121 | } |
21ed98c1 | 122 | ret = 0; |
d65106b1 | 123 | |
1ae5e83e | 124 | end: |
645328ae | 125 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 126 | ctx->in_list = true; |
cd9adb8b | 127 | ctx = nullptr; |
d65106b1 | 128 | error: |
df3c77c8 JG |
129 | if (ctx) { |
130 | trace_kernel_destroy_context(ctx); | |
131 | } | |
d65106b1 DG |
132 | return ret; |
133 | } | |
134 | ||
20fe2104 | 135 | /* |
050349bb DG |
136 | * Create a new kernel session, register it to the kernel tracer and add it to |
137 | * the session daemon session. | |
20fe2104 | 138 | */ |
7d268848 | 139 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
140 | { |
141 | int ret; | |
142 | struct ltt_kernel_session *lks; | |
143 | ||
a0377dfe | 144 | LTTNG_ASSERT(session); |
0525e9ae | 145 | |
54012638 | 146 | /* Allocate data structure */ |
dec56f6c | 147 | lks = trace_kernel_create_session(); |
cd9adb8b | 148 | if (lks == nullptr) { |
54012638 | 149 | ret = -1; |
20fe2104 DG |
150 | goto error; |
151 | } | |
152 | ||
54012638 | 153 | /* Kernel tracer session creation */ |
7d268848 | 154 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 155 | if (ret < 0) { |
df0f840b | 156 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
157 | goto error; |
158 | } | |
159 | ||
20fe2104 | 160 | lks->fd = ret; |
7b395890 DG |
161 | /* Prevent fd duplication after execlp() */ |
162 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
163 | if (ret < 0) { | |
df0f840b | 164 | PERROR("fcntl session fd"); |
7b395890 DG |
165 | } |
166 | ||
53632229 | 167 | lks->id = session->id; |
3bd1e081 | 168 | lks->consumer_fds_sent = 0; |
8c0faa1d | 169 | session->kernel_session = lks; |
8c0faa1d DG |
170 | |
171 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 172 | |
8ff4109e JR |
173 | /* |
174 | * This is necessary since the creation time is present in the session | |
175 | * name when it is generated. | |
176 | */ | |
177 | if (session->has_auto_generated_name) { | |
178 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
179 | } else { | |
180 | ret = kernctl_session_set_name(lks->fd, session->name); | |
181 | } | |
182 | if (ret) { | |
183 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
28ab034a JG |
184 | session->id, |
185 | session->name); | |
8ff4109e JR |
186 | } |
187 | ||
e04b2181 JR |
188 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
189 | if (ret) { | |
190 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
28ab034a JG |
191 | session->id, |
192 | session->name); | |
e04b2181 JR |
193 | } |
194 | ||
20fe2104 DG |
195 | return 0; |
196 | ||
197 | error: | |
5f62c685 DG |
198 | if (lks) { |
199 | trace_kernel_destroy_session(lks); | |
d070c424 | 200 | trace_kernel_free_session(lks); |
5f62c685 | 201 | } |
20fe2104 DG |
202 | return ret; |
203 | } | |
204 | ||
205 | /* | |
050349bb DG |
206 | * Create a kernel channel, register it to the kernel tracer and add it to the |
207 | * kernel session. | |
20fe2104 | 208 | */ |
28ab034a | 209 | int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan) |
20fe2104 DG |
210 | { |
211 | int ret; | |
212 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 213 | |
a0377dfe FD |
214 | LTTNG_ASSERT(session); |
215 | LTTNG_ASSERT(chan); | |
0525e9ae | 216 | |
54012638 | 217 | /* Allocate kernel channel */ |
fdd9eb17 | 218 | lkc = trace_kernel_create_channel(chan); |
cd9adb8b | 219 | if (lkc == nullptr) { |
20fe2104 DG |
220 | goto error; |
221 | } | |
222 | ||
ecc48a90 | 223 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
28ab034a JG |
224 | chan->name, |
225 | lkc->channel->attr.overwrite, | |
226 | lkc->channel->attr.subbuf_size, | |
227 | lkc->channel->attr.num_subbuf, | |
228 | lkc->channel->attr.switch_timer_interval, | |
229 | lkc->channel->attr.read_timer_interval, | |
230 | lkc->channel->attr.live_timer_interval, | |
231 | lkc->channel->attr.output); | |
173af62f | 232 | |
54012638 | 233 | /* Kernel tracer channel creation */ |
f3ed775e | 234 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 235 | if (ret < 0) { |
df0f840b | 236 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
237 | goto error; |
238 | } | |
239 | ||
54012638 | 240 | /* Setup the channel fd */ |
20fe2104 | 241 | lkc->fd = ret; |
7b395890 DG |
242 | /* Prevent fd duplication after execlp() */ |
243 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
244 | if (ret < 0) { | |
df0f840b | 245 | PERROR("fcntl session fd"); |
7b395890 DG |
246 | } |
247 | ||
54012638 | 248 | /* Add channel to session */ |
8c0faa1d DG |
249 | cds_list_add(&lkc->list, &session->channel_list.head); |
250 | session->channel_count++; | |
fb5f35b6 | 251 | lkc->session = session; |
e1f3997a | 252 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 253 | |
e1f3997a | 254 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
255 | lkc->channel->name, |
256 | lkc->fd, | |
257 | lkc->key); | |
20fe2104 DG |
258 | |
259 | return 0; | |
260 | ||
261 | error: | |
5f62c685 DG |
262 | if (lkc) { |
263 | free(lkc->channel); | |
264 | free(lkc); | |
265 | } | |
54012638 | 266 | return -1; |
20fe2104 | 267 | } |
f34daff7 | 268 | |
352b58f5 JR |
269 | /* |
270 | * Create a kernel event notifier group, register it to the kernel tracer and | |
271 | * add it to the kernel session. | |
272 | */ | |
273 | static int kernel_create_event_notifier_group(int *event_notifier_group_fd) | |
274 | { | |
275 | int ret; | |
276 | int local_fd = -1; | |
277 | ||
a0377dfe | 278 | LTTNG_ASSERT(event_notifier_group_fd); |
352b58f5 JR |
279 | |
280 | /* Kernel event notifier group creation. */ | |
281 | ret = kernctl_create_event_notifier_group(kernel_tracer_fd); | |
282 | if (ret < 0) { | |
283 | PERROR("Failed to create kernel event notifier group"); | |
284 | ret = -1; | |
285 | goto error; | |
286 | } | |
287 | ||
288 | local_fd = ret; | |
289 | ||
290 | /* Prevent fd duplication after execlp(). */ | |
291 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
292 | if (ret < 0) { | |
293 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 294 | local_fd); |
352b58f5 JR |
295 | goto error; |
296 | } | |
297 | ||
298 | DBG("Created kernel event notifier group: fd = %d", local_fd); | |
299 | *event_notifier_group_fd = local_fd; | |
300 | local_fd = -1; | |
301 | ret = 0; | |
302 | error: | |
303 | if (local_fd >= 0) { | |
304 | ret = close(local_fd); | |
305 | if (ret) { | |
306 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 307 | local_fd); |
352b58f5 JR |
308 | } |
309 | } | |
310 | ||
311 | return ret; | |
312 | } | |
313 | ||
410b78a0 FD |
314 | /* |
315 | * Compute the offset of the instrumentation byte in the binary based on the | |
316 | * function probe location using the ELF lookup method. | |
317 | * | |
318 | * Returns 0 on success and set the offset out parameter to the offset of the | |
319 | * elf symbol | |
320 | * Returns -1 on error | |
321 | */ | |
28ab034a JG |
322 | static int extract_userspace_probe_offset_function_elf( |
323 | const struct lttng_userspace_probe_location *probe_location, | |
324 | uid_t uid, | |
325 | gid_t gid, | |
326 | uint64_t *offset) | |
410b78a0 FD |
327 | { |
328 | int fd; | |
329 | int ret = 0; | |
cd9adb8b JG |
330 | const char *symbol = nullptr; |
331 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; | |
410b78a0 FD |
332 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
333 | ||
a0377dfe | 334 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 335 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
410b78a0 | 336 | |
28ab034a | 337 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); |
410b78a0 FD |
338 | if (!lookup) { |
339 | ret = -1; | |
340 | goto end; | |
341 | } | |
342 | ||
28ab034a | 343 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 344 | |
a0377dfe | 345 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 346 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); |
410b78a0 | 347 | |
28ab034a | 348 | symbol = lttng_userspace_probe_location_function_get_function_name(probe_location); |
410b78a0 FD |
349 | if (!symbol) { |
350 | ret = -1; | |
351 | goto end; | |
352 | } | |
353 | ||
354 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
355 | if (fd < 0) { | |
356 | ret = -1; | |
357 | goto end; | |
358 | } | |
359 | ||
0a398bc4 | 360 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
361 | if (ret < 0) { |
362 | DBG("userspace probe offset calculation failed for " | |
28ab034a JG |
363 | "function %s", |
364 | symbol); | |
410b78a0 FD |
365 | goto end; |
366 | } | |
367 | ||
28ab034a | 368 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t) (*offset)); |
410b78a0 FD |
369 | end: |
370 | return ret; | |
371 | } | |
372 | ||
373 | /* | |
374 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
375 | * tracepoint probe location using the SDT lookup method. This function | |
376 | * allocates the offsets buffer, the caller must free it. | |
377 | * | |
378 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
379 | * SDT tracepoint. | |
380 | * Returns -1 on error. | |
381 | */ | |
28ab034a JG |
382 | static int extract_userspace_probe_offset_tracepoint_sdt( |
383 | const struct lttng_userspace_probe_location *probe_location, | |
384 | uid_t uid, | |
385 | gid_t gid, | |
386 | uint64_t **offsets, | |
387 | uint32_t *offsets_count) | |
410b78a0 FD |
388 | { |
389 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
cd9adb8b JG |
390 | const struct lttng_userspace_probe_location_lookup_method *lookup = nullptr; |
391 | const char *probe_name = nullptr, *provider_name = nullptr; | |
410b78a0 FD |
392 | int ret = 0; |
393 | int fd, i; | |
394 | ||
a0377dfe | 395 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
28ab034a | 396 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
410b78a0 FD |
397 | |
398 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
399 | if (!lookup) { | |
400 | ret = -1; | |
401 | goto end; | |
402 | } | |
403 | ||
28ab034a | 404 | lookup_method_type = lttng_userspace_probe_location_lookup_method_get_type(lookup); |
410b78a0 | 405 | |
a0377dfe | 406 | LTTNG_ASSERT(lookup_method_type == |
28ab034a | 407 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); |
410b78a0 | 408 | |
28ab034a | 409 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(probe_location); |
410b78a0 FD |
410 | if (!probe_name) { |
411 | ret = -1; | |
412 | goto end; | |
413 | } | |
414 | ||
28ab034a | 415 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(probe_location); |
410b78a0 FD |
416 | if (!provider_name) { |
417 | ret = -1; | |
418 | goto end; | |
419 | } | |
420 | ||
421 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
422 | if (fd < 0) { | |
423 | ret = -1; | |
424 | goto end; | |
425 | } | |
426 | ||
28ab034a JG |
427 | ret = run_as_extract_sdt_probe_offsets( |
428 | fd, provider_name, probe_name, uid, gid, offsets, offsets_count); | |
410b78a0 FD |
429 | if (ret < 0) { |
430 | DBG("userspace probe offset calculation failed for sdt " | |
28ab034a JG |
431 | "probe %s:%s", |
432 | provider_name, | |
433 | probe_name); | |
410b78a0 FD |
434 | goto end; |
435 | } | |
436 | ||
437 | if (*offsets_count == 0) { | |
438 | DBG("no userspace probe offset found"); | |
439 | goto end; | |
440 | } | |
441 | ||
442 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
28ab034a JG |
443 | *offsets_count, |
444 | provider_name, | |
445 | probe_name); | |
410b78a0 | 446 | for (i = 0; i < *offsets_count; i++) { |
28ab034a | 447 | DBG("\t0x%jd", (intmax_t) ((*offsets)[i])); |
410b78a0 FD |
448 | } |
449 | end: | |
450 | return ret; | |
451 | } | |
452 | ||
28ab034a JG |
453 | static int userspace_probe_add_callsite(const struct lttng_userspace_probe_location *location, |
454 | uid_t uid, | |
455 | gid_t gid, | |
456 | int fd) | |
410b78a0 | 457 | { |
cd9adb8b | 458 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = nullptr; |
410b78a0 | 459 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
460 | int ret; |
461 | ||
0a398bc4 | 462 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
463 | if (!lookup_method) { |
464 | ret = -1; | |
465 | goto end; | |
466 | } | |
467 | ||
468 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
469 | switch (type) { | |
470 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
471 | { | |
b8e2fb80 | 472 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
473 | uint64_t offset; |
474 | ||
28ab034a | 475 | ret = extract_userspace_probe_offset_function_elf(location, uid, gid, &offset); |
410b78a0 FD |
476 | if (ret) { |
477 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
478 | goto end; | |
479 | } | |
480 | ||
56a9a0b7 | 481 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offset); |
410b78a0 FD |
482 | ret = kernctl_add_callsite(fd, &callsite); |
483 | if (ret) { | |
0a398bc4 | 484 | WARN("Failed to add callsite to ELF userspace probe."); |
410b78a0 FD |
485 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
486 | goto end; | |
487 | } | |
488 | break; | |
489 | } | |
490 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
491 | { | |
492 | int i; | |
cd9adb8b | 493 | uint64_t *offsets = nullptr; |
410b78a0 | 494 | uint32_t offsets_count; |
b8e2fb80 | 495 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
496 | |
497 | /* | |
498 | * This call allocates the offsets buffer. This buffer must be freed | |
499 | * by the caller | |
500 | */ | |
28ab034a JG |
501 | ret = extract_userspace_probe_offset_tracepoint_sdt( |
502 | location, uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
503 | if (ret) { |
504 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
505 | goto end; | |
506 | } | |
507 | for (i = 0; i < offsets_count; i++) { | |
56a9a0b7 | 508 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offsets[i]); |
410b78a0 FD |
509 | ret = kernctl_add_callsite(fd, &callsite); |
510 | if (ret) { | |
0a398bc4 | 511 | WARN("Failed to add callsite to SDT userspace probe"); |
410b78a0 FD |
512 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
513 | free(offsets); | |
514 | goto end; | |
515 | } | |
516 | } | |
517 | free(offsets); | |
518 | break; | |
519 | } | |
520 | default: | |
521 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
522 | goto end; | |
523 | } | |
524 | end: | |
525 | return ret; | |
526 | } | |
527 | ||
0a398bc4 FD |
528 | /* |
529 | * Extract the offsets of the instrumentation point for the different lookup | |
530 | * methods. | |
531 | */ | |
28ab034a JG |
532 | static int userspace_probe_event_add_callsites(struct lttng_event *ev, |
533 | struct ltt_kernel_session *session, | |
534 | int fd) | |
0a398bc4 FD |
535 | { |
536 | int ret; | |
cd9adb8b | 537 | const struct lttng_userspace_probe_location *location = nullptr; |
0a398bc4 | 538 | |
a0377dfe FD |
539 | LTTNG_ASSERT(ev); |
540 | LTTNG_ASSERT(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
0a398bc4 FD |
541 | |
542 | location = lttng_event_get_userspace_probe_location(ev); | |
543 | if (!location) { | |
544 | ret = -1; | |
545 | goto end; | |
546 | } | |
547 | ||
28ab034a | 548 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, fd); |
0a398bc4 | 549 | if (ret) { |
28ab034a | 550 | WARN("Failed to add callsite to userspace probe event '%s'", ev->name); |
0a398bc4 FD |
551 | } |
552 | ||
553 | end: | |
554 | return ret; | |
555 | } | |
556 | ||
352b58f5 JR |
557 | /* |
558 | * Extract the offsets of the instrumentation point for the different look-up | |
559 | * methods. | |
560 | */ | |
28ab034a JG |
561 | static int userspace_probe_event_rule_add_callsites(const struct lttng_event_rule *rule, |
562 | const struct lttng_credentials *creds, | |
563 | int fd) | |
352b58f5 JR |
564 | { |
565 | int ret; | |
566 | enum lttng_event_rule_status status; | |
567 | enum lttng_event_rule_type event_rule_type; | |
cd9adb8b | 568 | const struct lttng_userspace_probe_location *location = nullptr; |
352b58f5 | 569 | |
a0377dfe FD |
570 | LTTNG_ASSERT(rule); |
571 | LTTNG_ASSERT(creds); | |
352b58f5 JR |
572 | |
573 | event_rule_type = lttng_event_rule_get_type(rule); | |
a0377dfe | 574 | LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
352b58f5 | 575 | |
46fd07ac | 576 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); |
352b58f5 JR |
577 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { |
578 | ret = -1; | |
579 | goto end; | |
580 | } | |
581 | ||
28ab034a JG |
582 | ret = userspace_probe_add_callsite( |
583 | location, lttng_credentials_get_uid(creds), lttng_credentials_get_gid(creds), fd); | |
352b58f5 | 584 | if (ret) { |
28ab034a | 585 | WARN("Failed to add callsite to user space probe object: fd = %d", fd); |
352b58f5 JR |
586 | } |
587 | ||
588 | end: | |
589 | return ret; | |
590 | } | |
591 | ||
f34daff7 | 592 | /* |
050349bb DG |
593 | * Create a kernel event, enable it to the kernel tracer and add it to the |
594 | * channel event list of the kernel session. | |
49d21f93 | 595 | * We own filter_expression and filter. |
f34daff7 | 596 | */ |
050349bb | 597 | int kernel_create_event(struct lttng_event *ev, |
28ab034a JG |
598 | struct ltt_kernel_channel *channel, |
599 | char *filter_expression, | |
600 | struct lttng_bytecode *filter) | |
f34daff7 | 601 | { |
71a3bb01 FD |
602 | int err, fd; |
603 | enum lttng_error_code ret; | |
f34daff7 | 604 | struct ltt_kernel_event *event; |
f34daff7 | 605 | |
a0377dfe FD |
606 | LTTNG_ASSERT(ev); |
607 | LTTNG_ASSERT(channel); | |
0525e9ae | 608 | |
a969e101 | 609 | /* We pass ownership of filter_expression and filter */ |
28ab034a | 610 | ret = trace_kernel_create_event(ev, filter_expression, filter, &event); |
71a3bb01 | 611 | if (ret != LTTNG_OK) { |
f34daff7 DG |
612 | goto error; |
613 | } | |
614 | ||
71a3bb01 FD |
615 | fd = kernctl_create_event(channel->fd, event->event); |
616 | if (fd < 0) { | |
617 | switch (-fd) { | |
bd29c13d | 618 | case EEXIST: |
71a3bb01 | 619 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
620 | break; |
621 | case ENOSYS: | |
622 | WARN("Event type not implemented"); | |
71a3bb01 | 623 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 624 | break; |
8197a339 DG |
625 | case ENOENT: |
626 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 627 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 628 | break; |
bd29c13d | 629 | default: |
71a3bb01 | 630 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
631 | PERROR("create event ioctl"); |
632 | } | |
e953ef25 | 633 | goto free_event; |
8c0faa1d | 634 | } |
f34daff7 | 635 | |
d0ae4ea8 | 636 | event->type = ev->type; |
71a3bb01 | 637 | event->fd = fd; |
7b395890 | 638 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
639 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
640 | if (err < 0) { | |
df0f840b | 641 | PERROR("fcntl session fd"); |
7b395890 DG |
642 | } |
643 | ||
00a62084 | 644 | if (filter) { |
71a3bb01 FD |
645 | err = kernctl_filter(event->fd, filter); |
646 | if (err < 0) { | |
647 | switch (-err) { | |
648 | case ENOMEM: | |
649 | ret = LTTNG_ERR_FILTER_NOMEM; | |
650 | break; | |
651 | default: | |
652 | ret = LTTNG_ERR_FILTER_INVAL; | |
653 | break; | |
654 | } | |
00a62084 MD |
655 | goto filter_error; |
656 | } | |
657 | } | |
658 | ||
dcabc190 | 659 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
28ab034a JG |
660 | ret = (lttng_error_code) userspace_probe_event_add_callsites( |
661 | ev, channel->session, event->fd); | |
dcabc190 FD |
662 | if (ret) { |
663 | goto add_callsite_error; | |
664 | } | |
665 | } | |
666 | ||
71a3bb01 FD |
667 | err = kernctl_enable(event->fd); |
668 | if (err < 0) { | |
669 | switch (-err) { | |
00a62084 MD |
670 | case EEXIST: |
671 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
672 | break; | |
673 | default: | |
674 | PERROR("enable kernel event"); | |
71a3bb01 | 675 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
676 | break; |
677 | } | |
678 | goto enable_error; | |
679 | } | |
680 | ||
f3ed775e DG |
681 | /* Add event to event list */ |
682 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
683 | channel->event_count++; |
684 | ||
e953ef25 DG |
685 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
686 | ||
687 | return 0; | |
688 | ||
dcabc190 | 689 | add_callsite_error: |
00a62084 MD |
690 | enable_error: |
691 | filter_error: | |
28ab034a JG |
692 | { |
693 | int closeret; | |
00a62084 | 694 | |
28ab034a JG |
695 | closeret = close(event->fd); |
696 | if (closeret) { | |
697 | PERROR("close event fd"); | |
00a62084 | 698 | } |
28ab034a | 699 | } |
e953ef25 DG |
700 | free_event: |
701 | free(event); | |
702 | error: | |
d87bfb32 | 703 | return ret; |
e953ef25 DG |
704 | } |
705 | ||
26cc6b4e | 706 | /* |
050349bb | 707 | * Disable a kernel channel. |
26cc6b4e DG |
708 | */ |
709 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
710 | { | |
711 | int ret; | |
712 | ||
a0377dfe | 713 | LTTNG_ASSERT(chan); |
0525e9ae | 714 | |
26cc6b4e DG |
715 | ret = kernctl_disable(chan->fd); |
716 | if (ret < 0) { | |
df0f840b | 717 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
718 | goto error; |
719 | } | |
720 | ||
66cefebd | 721 | chan->enabled = false; |
e1f3997a | 722 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
723 | chan->channel->name, |
724 | chan->fd, | |
725 | chan->key); | |
26cc6b4e DG |
726 | |
727 | return 0; | |
728 | ||
729 | error: | |
730 | return ret; | |
731 | } | |
732 | ||
d36b8583 | 733 | /* |
050349bb | 734 | * Enable a kernel channel. |
d36b8583 DG |
735 | */ |
736 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
737 | { | |
738 | int ret; | |
739 | ||
a0377dfe | 740 | LTTNG_ASSERT(chan); |
0525e9ae | 741 | |
d36b8583 | 742 | ret = kernctl_enable(chan->fd); |
32af2c95 | 743 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 744 | PERROR("Enable kernel chan"); |
d36b8583 DG |
745 | goto error; |
746 | } | |
747 | ||
66cefebd | 748 | chan->enabled = true; |
e1f3997a | 749 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
28ab034a JG |
750 | chan->channel->name, |
751 | chan->fd, | |
752 | chan->key); | |
d36b8583 DG |
753 | |
754 | return 0; | |
755 | ||
756 | error: | |
757 | return ret; | |
758 | } | |
759 | ||
19e70852 | 760 | /* |
050349bb | 761 | * Enable a kernel event. |
19e70852 DG |
762 | */ |
763 | int kernel_enable_event(struct ltt_kernel_event *event) | |
764 | { | |
765 | int ret; | |
766 | ||
a0377dfe | 767 | LTTNG_ASSERT(event); |
0525e9ae | 768 | |
19e70852 | 769 | ret = kernctl_enable(event->fd); |
42224349 | 770 | if (ret < 0) { |
32af2c95 | 771 | switch (-ret) { |
42224349 | 772 | case EEXIST: |
f73fabfd | 773 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
774 | break; |
775 | default: | |
776 | PERROR("enable kernel event"); | |
777 | break; | |
778 | } | |
19e70852 DG |
779 | goto error; |
780 | } | |
781 | ||
66cefebd | 782 | event->enabled = true; |
19e70852 DG |
783 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); |
784 | ||
785 | return 0; | |
786 | ||
787 | error: | |
d36b8583 | 788 | return ret; |
19e70852 DG |
789 | } |
790 | ||
e953ef25 | 791 | /* |
050349bb | 792 | * Disable a kernel event. |
e953ef25 | 793 | */ |
19e70852 | 794 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
795 | { |
796 | int ret; | |
19e70852 | 797 | |
a0377dfe | 798 | LTTNG_ASSERT(event); |
0525e9ae | 799 | |
19e70852 | 800 | ret = kernctl_disable(event->fd); |
42224349 | 801 | if (ret < 0) { |
d79bd829 | 802 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
28ab034a JG |
803 | event->event->name, |
804 | event->fd); | |
19e70852 | 805 | goto error; |
e953ef25 | 806 | } |
f3ed775e | 807 | |
66cefebd | 808 | event->enabled = false; |
19e70852 DG |
809 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); |
810 | ||
f34daff7 DG |
811 | return 0; |
812 | ||
813 | error: | |
d36b8583 | 814 | return ret; |
f34daff7 | 815 | } |
aaf26714 | 816 | |
352b58f5 JR |
817 | /* |
818 | * Disable a kernel event notifier. | |
819 | */ | |
28ab034a | 820 | static int kernel_disable_event_notifier_rule(struct ltt_kernel_event_notifier_rule *event) |
352b58f5 JR |
821 | { |
822 | int ret; | |
823 | ||
a0377dfe | 824 | LTTNG_ASSERT(event); |
352b58f5 | 825 | |
56047f5a | 826 | lttng::urcu::read_lock_guard read_lock; |
352b58f5 | 827 | cds_lfht_del(kernel_token_to_event_notifier_rule_ht, &event->ht_node); |
352b58f5 JR |
828 | |
829 | ret = kernctl_disable(event->fd); | |
830 | if (ret < 0) { | |
d79bd829 | 831 | PERROR("Failed to disable kernel event notifier: fd = %d, token = %" PRIu64, |
28ab034a JG |
832 | event->fd, |
833 | event->token); | |
352b58f5 JR |
834 | goto error; |
835 | } | |
836 | ||
66cefebd | 837 | event->enabled = false; |
28ab034a | 838 | DBG("Disabled kernel event notifier: fd = %d, token = %" PRIu64, event->fd, event->token); |
352b58f5 JR |
839 | |
840 | error: | |
841 | return ret; | |
842 | } | |
843 | ||
28ab034a JG |
844 | static struct process_attr_tracker * |
845 | _kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
846 | enum lttng_process_attr process_attr) | |
55c9e7ca | 847 | { |
159b042f JG |
848 | switch (process_attr) { |
849 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
850 | return session->tracker_pid; | |
851 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
852 | return session->tracker_vpid; | |
853 | case LTTNG_PROCESS_ATTR_USER_ID: | |
854 | return session->tracker_uid; | |
855 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
856 | return session->tracker_vuid; | |
857 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
858 | return session->tracker_gid; | |
859 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
860 | return session->tracker_vgid; | |
55c9e7ca | 861 | default: |
cd9adb8b | 862 | return nullptr; |
55c9e7ca JR |
863 | } |
864 | } | |
6e911cad | 865 | |
28ab034a JG |
866 | const struct process_attr_tracker * |
867 | kernel_get_process_attr_tracker(struct ltt_kernel_session *session, | |
868 | enum lttng_process_attr process_attr) | |
ccf10263 | 869 | { |
28ab034a JG |
870 | return (const struct process_attr_tracker *) _kernel_get_process_attr_tracker(session, |
871 | process_attr); | |
159b042f | 872 | } |
7c493d31 | 873 | |
28ab034a JG |
874 | enum lttng_error_code |
875 | kernel_process_attr_tracker_set_tracking_policy(struct ltt_kernel_session *session, | |
876 | enum lttng_process_attr process_attr, | |
877 | enum lttng_tracking_policy policy) | |
159b042f JG |
878 | { |
879 | int ret; | |
880 | enum lttng_error_code ret_code = LTTNG_OK; | |
881 | struct process_attr_tracker *tracker = | |
28ab034a | 882 | _kernel_get_process_attr_tracker(session, process_attr); |
159b042f | 883 | enum lttng_tracking_policy previous_policy; |
55c9e7ca | 884 | |
159b042f JG |
885 | if (!tracker) { |
886 | ret_code = LTTNG_ERR_INVALID; | |
887 | goto end; | |
7c493d31 | 888 | } |
ccf10263 | 889 | |
159b042f JG |
890 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
891 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
892 | if (ret) { | |
893 | ret_code = LTTNG_ERR_UNK; | |
894 | goto end; | |
55c9e7ca | 895 | } |
7c493d31 | 896 | |
159b042f | 897 | if (previous_policy == policy) { |
55c9e7ca | 898 | goto end; |
7c493d31 | 899 | } |
55c9e7ca | 900 | |
159b042f JG |
901 | switch (policy) { |
902 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
903 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
904 | /* | |
905 | * Maintain a special case for the process ID process | |
906 | * attribute tracker as it was the only supported | |
907 | * attribute prior to 2.12. | |
908 | */ | |
909 | ret = kernctl_track_pid(session->fd, -1); | |
910 | } else { | |
911 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
912 | } |
913 | break; | |
159b042f JG |
914 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
915 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
916 | /* fall-through. */ | |
917 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
918 | /* | |
919 | * Maintain a special case for the process ID process | |
920 | * attribute tracker as it was the only supported | |
921 | * attribute prior to 2.12. | |
922 | */ | |
923 | ret = kernctl_untrack_pid(session->fd, -1); | |
924 | } else { | |
925 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
926 | } |
927 | break; | |
928 | default: | |
159b042f | 929 | abort(); |
55c9e7ca | 930 | } |
159b042f | 931 | /* kern-ctl error handling */ |
32af2c95 | 932 | switch (-ret) { |
159b042f JG |
933 | case 0: |
934 | ret_code = LTTNG_OK; | |
935 | break; | |
7c493d31 | 936 | case EINVAL: |
159b042f | 937 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 938 | break; |
7c493d31 | 939 | case ENOMEM: |
159b042f | 940 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
941 | break; |
942 | case EEXIST: | |
159b042f | 943 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 944 | break; |
7c493d31 | 945 | default: |
159b042f | 946 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
947 | break; |
948 | } | |
55c9e7ca | 949 | end: |
159b042f | 950 | return ret_code; |
ccf10263 MD |
951 | } |
952 | ||
28ab034a JG |
953 | enum lttng_error_code |
954 | kernel_process_attr_tracker_inclusion_set_add_value(struct ltt_kernel_session *session, | |
955 | enum lttng_process_attr process_attr, | |
956 | const struct process_attr_value *value) | |
a5dfbb9d | 957 | { |
159b042f JG |
958 | int ret, integral_value; |
959 | enum lttng_error_code ret_code; | |
960 | struct process_attr_tracker *tracker; | |
961 | enum process_attr_tracker_status status; | |
a5dfbb9d | 962 | |
159b042f JG |
963 | /* |
964 | * Convert process attribute tracker value to the integral | |
965 | * representation required by the kern-ctl API. | |
966 | */ | |
967 | switch (process_attr) { | |
968 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
969 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
970 | integral_value = (int) value->value.pid; | |
55c9e7ca | 971 | break; |
159b042f JG |
972 | case LTTNG_PROCESS_ATTR_USER_ID: |
973 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
974 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
975 | uid_t uid; | |
976 | ||
28ab034a | 977 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
978 | if (ret_code != LTTNG_OK) { |
979 | goto end; | |
980 | } | |
981 | integral_value = (int) uid; | |
982 | } else { | |
983 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
984 | } |
985 | break; | |
159b042f JG |
986 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
987 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
988 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
989 | gid_t gid; | |
990 | ||
28ab034a | 991 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
992 | if (ret_code != LTTNG_OK) { |
993 | goto end; | |
994 | } | |
995 | integral_value = (int) gid; | |
996 | } else { | |
997 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 998 | } |
55c9e7ca JR |
999 | break; |
1000 | default: | |
159b042f JG |
1001 | ret_code = LTTNG_ERR_INVALID; |
1002 | goto end; | |
55c9e7ca JR |
1003 | } |
1004 | ||
159b042f JG |
1005 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1006 | if (!tracker) { | |
1007 | ret_code = LTTNG_ERR_INVALID; | |
1008 | goto end; | |
1009 | } | |
1010 | ||
1011 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
1012 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1013 | switch (status) { | |
1014 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
1015 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
1016 | break; | |
1017 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1018 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1019 | break; | |
1020 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1021 | default: | |
1022 | ret_code = LTTNG_ERR_UNK; | |
1023 | break; | |
1024 | } | |
1025 | goto end; | |
1026 | } | |
1027 | ||
1028 | DBG("Kernel track %s %d for session id %" PRIu64, | |
28ab034a JG |
1029 | lttng_process_attr_to_string(process_attr), |
1030 | integral_value, | |
1031 | session->id); | |
159b042f JG |
1032 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1033 | /* | |
1034 | * Maintain a special case for the process ID process attribute | |
1035 | * tracker as it was the only supported attribute prior to 2.12. | |
1036 | */ | |
1037 | ret = kernctl_track_pid(session->fd, integral_value); | |
1038 | } else { | |
28ab034a | 1039 | ret = kernctl_track_id(session->fd, process_attr, integral_value); |
159b042f JG |
1040 | } |
1041 | if (ret == 0) { | |
1042 | ret_code = LTTNG_OK; | |
1043 | goto end; | |
1044 | } | |
1045 | ||
1046 | kernel_wait_quiescent(); | |
1047 | ||
1048 | /* kern-ctl error handling */ | |
55c9e7ca | 1049 | switch (-ret) { |
159b042f JG |
1050 | case 0: |
1051 | ret_code = LTTNG_OK; | |
1052 | break; | |
55c9e7ca | 1053 | case EINVAL: |
159b042f | 1054 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1055 | break; |
1056 | case ENOMEM: | |
159b042f | 1057 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1058 | break; |
1059 | case EEXIST: | |
159b042f | 1060 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1061 | break; |
1062 | default: | |
159b042f | 1063 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1064 | break; |
a5dfbb9d MD |
1065 | } |
1066 | ||
159b042f | 1067 | /* Attempt to remove the value from the tracker. */ |
28ab034a | 1068 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1069 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1070 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1071 | lttng_process_attr_to_string(process_attr), |
1072 | integral_value); | |
55c9e7ca | 1073 | } |
a5dfbb9d | 1074 | end: |
159b042f | 1075 | return ret_code; |
55c9e7ca | 1076 | } |
a5dfbb9d | 1077 | |
28ab034a JG |
1078 | enum lttng_error_code |
1079 | kernel_process_attr_tracker_inclusion_set_remove_value(struct ltt_kernel_session *session, | |
1080 | enum lttng_process_attr process_attr, | |
1081 | const struct process_attr_value *value) | |
55c9e7ca | 1082 | { |
159b042f JG |
1083 | int ret, integral_value; |
1084 | enum lttng_error_code ret_code; | |
1085 | struct process_attr_tracker *tracker; | |
1086 | enum process_attr_tracker_status status; | |
1087 | ||
1088 | /* | |
1089 | * Convert process attribute tracker value to the integral | |
1090 | * representation required by the kern-ctl API. | |
1091 | */ | |
1092 | switch (process_attr) { | |
1093 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1094 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1095 | integral_value = (int) value->value.pid; | |
1096 | break; | |
1097 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1098 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1099 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1100 | uid_t uid; | |
1101 | ||
28ab034a | 1102 | ret_code = utils_user_id_from_name(value->value.user_name, &uid); |
159b042f JG |
1103 | if (ret_code != LTTNG_OK) { |
1104 | goto end; | |
1105 | } | |
1106 | integral_value = (int) uid; | |
1107 | } else { | |
1108 | integral_value = (int) value->value.uid; | |
1109 | } | |
1110 | break; | |
1111 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1112 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1113 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1114 | gid_t gid; | |
1115 | ||
28ab034a | 1116 | ret_code = utils_group_id_from_name(value->value.group_name, &gid); |
159b042f JG |
1117 | if (ret_code != LTTNG_OK) { |
1118 | goto end; | |
1119 | } | |
1120 | integral_value = (int) gid; | |
1121 | } else { | |
1122 | integral_value = (int) value->value.gid; | |
1123 | } | |
1124 | break; | |
1125 | default: | |
1126 | ret_code = LTTNG_ERR_INVALID; | |
1127 | goto end; | |
1128 | } | |
55c9e7ca | 1129 | |
159b042f JG |
1130 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1131 | if (!tracker) { | |
1132 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1133 | goto end; |
a5dfbb9d | 1134 | } |
a7a533cd | 1135 | |
28ab034a | 1136 | status = process_attr_tracker_inclusion_set_remove_value(tracker, value); |
159b042f JG |
1137 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1138 | switch (status) { | |
1139 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1140 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1141 | break; | |
1142 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1143 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1144 | break; | |
1145 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1146 | default: | |
1147 | ret_code = LTTNG_ERR_UNK; | |
1148 | break; | |
1149 | } | |
a7a533cd JR |
1150 | goto end; |
1151 | } | |
1152 | ||
159b042f | 1153 | DBG("Kernel track %s %d for session id %" PRIu64, |
28ab034a JG |
1154 | lttng_process_attr_to_string(process_attr), |
1155 | integral_value, | |
1156 | session->id); | |
159b042f JG |
1157 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { |
1158 | /* | |
1159 | * Maintain a special case for the process ID process attribute | |
1160 | * tracker as it was the only supported attribute prior to 2.12. | |
1161 | */ | |
1162 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1163 | } else { | |
28ab034a | 1164 | ret = kernctl_untrack_id(session->fd, process_attr, integral_value); |
159b042f JG |
1165 | } |
1166 | if (ret == 0) { | |
1167 | ret_code = LTTNG_OK; | |
1168 | goto end; | |
1169 | } | |
1170 | kernel_wait_quiescent(); | |
1171 | ||
1172 | /* kern-ctl error handling */ | |
1173 | switch (-ret) { | |
1174 | case 0: | |
1175 | ret_code = LTTNG_OK; | |
1176 | break; | |
1177 | case EINVAL: | |
1178 | ret_code = LTTNG_ERR_INVALID; | |
1179 | break; | |
1180 | case ENOMEM: | |
1181 | ret_code = LTTNG_ERR_NOMEM; | |
1182 | break; | |
1183 | case ENOENT: | |
1184 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1185 | break; | |
1186 | default: | |
1187 | ret_code = LTTNG_ERR_UNK; | |
1188 | break; | |
1189 | } | |
1190 | ||
1191 | /* Attempt to add the value to the tracker. */ | |
28ab034a | 1192 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); |
159b042f JG |
1193 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { |
1194 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
28ab034a JG |
1195 | lttng_process_attr_to_string(process_attr), |
1196 | integral_value); | |
159b042f | 1197 | } |
a7a533cd | 1198 | end: |
159b042f | 1199 | return ret_code; |
a5dfbb9d MD |
1200 | } |
1201 | ||
aaf26714 | 1202 | /* |
050349bb DG |
1203 | * Create kernel metadata, open from the kernel tracer and add it to the |
1204 | * kernel session. | |
aaf26714 | 1205 | */ |
a4b92340 | 1206 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1207 | { |
1208 | int ret; | |
cd9adb8b | 1209 | struct ltt_kernel_metadata *lkm = nullptr; |
aaf26714 | 1210 | |
a0377dfe | 1211 | LTTNG_ASSERT(session); |
0525e9ae | 1212 | |
54012638 | 1213 | /* Allocate kernel metadata */ |
a4b92340 | 1214 | lkm = trace_kernel_create_metadata(); |
cd9adb8b | 1215 | if (lkm == nullptr) { |
aaf26714 DG |
1216 | goto error; |
1217 | } | |
1218 | ||
54012638 | 1219 | /* Kernel tracer metadata creation */ |
f3ed775e | 1220 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1221 | if (ret < 0) { |
74024a21 | 1222 | goto error_open; |
aaf26714 DG |
1223 | } |
1224 | ||
8c0faa1d | 1225 | lkm->fd = ret; |
d40f0359 | 1226 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1227 | /* Prevent fd duplication after execlp() */ |
1228 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1229 | if (ret < 0) { | |
df0f840b | 1230 | PERROR("fcntl session fd"); |
7b395890 DG |
1231 | } |
1232 | ||
aaf26714 | 1233 | session->metadata = lkm; |
8c0faa1d | 1234 | |
00e2e675 | 1235 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1236 | |
1237 | return 0; | |
1238 | ||
74024a21 DG |
1239 | error_open: |
1240 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1241 | error: |
54012638 | 1242 | return -1; |
8c0faa1d DG |
1243 | } |
1244 | ||
1245 | /* | |
050349bb | 1246 | * Start tracing session. |
8c0faa1d DG |
1247 | */ |
1248 | int kernel_start_session(struct ltt_kernel_session *session) | |
1249 | { | |
1250 | int ret; | |
1251 | ||
a0377dfe | 1252 | LTTNG_ASSERT(session); |
0525e9ae | 1253 | |
8c0faa1d DG |
1254 | ret = kernctl_start_session(session->fd); |
1255 | if (ret < 0) { | |
df0f840b | 1256 | PERROR("ioctl start session"); |
8c0faa1d DG |
1257 | goto error; |
1258 | } | |
1259 | ||
1260 | DBG("Kernel session started"); | |
1261 | ||
1262 | return 0; | |
1263 | ||
1264 | error: | |
1265 | return ret; | |
1266 | } | |
1267 | ||
f3ed775e | 1268 | /* |
050349bb | 1269 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1270 | */ |
cd9adb8b | 1271 | void kernel_wait_quiescent() |
f3ed775e DG |
1272 | { |
1273 | int ret; | |
7d268848 | 1274 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1275 | |
1276 | DBG("Kernel quiescent wait on %d", fd); | |
1277 | ||
1278 | ret = kernctl_wait_quiescent(fd); | |
1279 | if (ret < 0) { | |
df0f840b | 1280 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1281 | ERR("Kernel quiescent wait failed"); |
1282 | } | |
1283 | } | |
1284 | ||
1285 | /* | |
f3ed775e DG |
1286 | * Force flush buffer of metadata. |
1287 | */ | |
1288 | int kernel_metadata_flush_buffer(int fd) | |
1289 | { | |
1290 | int ret; | |
1291 | ||
169d2cb7 DG |
1292 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1293 | ||
f3ed775e DG |
1294 | ret = kernctl_buffer_flush(fd); |
1295 | if (ret < 0) { | |
00e2e675 | 1296 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1297 | } |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | /* | |
050349bb | 1303 | * Force flush buffer for channel. |
f3ed775e DG |
1304 | */ |
1305 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1306 | { | |
1307 | int ret; | |
1308 | struct ltt_kernel_stream *stream; | |
1309 | ||
a0377dfe | 1310 | LTTNG_ASSERT(channel); |
0525e9ae | 1311 | |
f3ed775e DG |
1312 | DBG("Flush buffer for channel %s", channel->channel->name); |
1313 | ||
28ab034a | 1314 | cds_list_for_each_entry (stream, &channel->stream_list.head, list) { |
f3ed775e DG |
1315 | DBG("Flushing channel stream %d", stream->fd); |
1316 | ret = kernctl_buffer_flush(stream->fd); | |
1317 | if (ret < 0) { | |
df0f840b | 1318 | PERROR("ioctl"); |
28ab034a | 1319 | ERR("Fail to flush buffer for stream %d (ret: %d)", stream->fd, ret); |
f3ed775e DG |
1320 | } |
1321 | } | |
1322 | ||
1323 | return 0; | |
1324 | } | |
1325 | ||
8c0faa1d | 1326 | /* |
050349bb | 1327 | * Stop tracing session. |
8c0faa1d DG |
1328 | */ |
1329 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1330 | { | |
1331 | int ret; | |
1332 | ||
a0377dfe | 1333 | LTTNG_ASSERT(session); |
0525e9ae | 1334 | |
8c0faa1d DG |
1335 | ret = kernctl_stop_session(session->fd); |
1336 | if (ret < 0) { | |
1337 | goto error; | |
1338 | } | |
1339 | ||
1340 | DBG("Kernel session stopped"); | |
1341 | ||
1342 | return 0; | |
1343 | ||
1344 | error: | |
1345 | return ret; | |
1346 | } | |
1347 | ||
1348 | /* | |
050349bb DG |
1349 | * Open stream of channel, register it to the kernel tracer and add it |
1350 | * to the stream list of the channel. | |
8c0faa1d | 1351 | * |
1cfb4b98 MD |
1352 | * Note: given that the streams may appear in random order wrt CPU |
1353 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1354 | * the stream name is not necessarily linked to the CPU number. | |
1355 | * | |
050349bb | 1356 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1357 | */ |
f3ed775e | 1358 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1359 | { |
1cfb4b98 | 1360 | int ret; |
8c0faa1d DG |
1361 | struct ltt_kernel_stream *lks; |
1362 | ||
a0377dfe | 1363 | LTTNG_ASSERT(channel); |
0525e9ae | 1364 | |
5a47c6a2 | 1365 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
28ab034a | 1366 | lks = trace_kernel_create_stream(channel->channel->name, channel->stream_count); |
cd9adb8b | 1367 | if (lks == nullptr) { |
799e2c4f MD |
1368 | ret = close(ret); |
1369 | if (ret) { | |
1370 | PERROR("close"); | |
1371 | } | |
8c0faa1d DG |
1372 | goto error; |
1373 | } | |
1374 | ||
1375 | lks->fd = ret; | |
7b395890 DG |
1376 | /* Prevent fd duplication after execlp() */ |
1377 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1378 | if (ret < 0) { | |
df0f840b | 1379 | PERROR("fcntl session fd"); |
7b395890 DG |
1380 | } |
1381 | ||
1624d5b7 JD |
1382 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1383 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1384 | ||
1cfb4b98 | 1385 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1386 | cds_list_add(&lks->list, &channel->stream_list.head); |
1387 | channel->stream_count++; | |
8c0faa1d | 1388 | |
28ab034a | 1389 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, lks->state); |
54012638 | 1390 | } |
8c0faa1d DG |
1391 | |
1392 | return channel->stream_count; | |
1393 | ||
1394 | error: | |
54012638 | 1395 | return -1; |
8c0faa1d DG |
1396 | } |
1397 | ||
1398 | /* | |
050349bb | 1399 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1400 | */ |
f3ed775e | 1401 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1402 | { |
1403 | int ret; | |
1404 | ||
a0377dfe | 1405 | LTTNG_ASSERT(session); |
0525e9ae | 1406 | |
8c0faa1d DG |
1407 | ret = kernctl_create_stream(session->metadata->fd); |
1408 | if (ret < 0) { | |
df0f840b | 1409 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1410 | goto error; |
1411 | } | |
1412 | ||
1413 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1414 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1415 | /* Prevent fd duplication after execlp() */ |
1416 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1417 | if (ret < 0) { | |
df0f840b | 1418 | PERROR("fcntl session fd"); |
7b395890 | 1419 | } |
aaf26714 DG |
1420 | |
1421 | return 0; | |
1422 | ||
1423 | error: | |
54012638 | 1424 | return -1; |
aaf26714 | 1425 | } |
2ef84c95 DG |
1426 | |
1427 | /* | |
9f19cc17 | 1428 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1429 | */ |
7d268848 | 1430 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1431 | { |
53efb85a | 1432 | int fd, ret; |
9f19cc17 DG |
1433 | char *event; |
1434 | size_t nbmem, count = 0; | |
2ef84c95 | 1435 | FILE *fp; |
9f19cc17 | 1436 | struct lttng_event *elist; |
2ef84c95 | 1437 | |
a0377dfe | 1438 | LTTNG_ASSERT(events); |
0525e9ae | 1439 | |
7d268848 | 1440 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1441 | if (fd < 0) { |
df0f840b | 1442 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1443 | goto error; |
1444 | } | |
1445 | ||
1446 | fp = fdopen(fd, "r"); | |
cd9adb8b | 1447 | if (fp == nullptr) { |
df0f840b | 1448 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1449 | goto error_fp; |
2ef84c95 DG |
1450 | } |
1451 | ||
1452 | /* | |
1453 | * Init memory size counter | |
1454 | * See kernel-ctl.h for explanation of this value | |
1455 | */ | |
6725fe19 | 1456 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
64803277 | 1457 | elist = calloc<lttng_event>(nbmem); |
cd9adb8b | 1458 | if (elist == nullptr) { |
3b870559 MD |
1459 | PERROR("alloc list events"); |
1460 | count = -ENOMEM; | |
1461 | goto end; | |
1462 | } | |
2ef84c95 | 1463 | |
53efb85a | 1464 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1465 | if (count >= nbmem) { |
3b870559 | 1466 | struct lttng_event *new_elist; |
53efb85a | 1467 | size_t new_nbmem; |
3b870559 | 1468 | |
53efb85a | 1469 | new_nbmem = nbmem << 1; |
28ab034a JG |
1470 | DBG("Reallocating event list from %zu to %zu bytes", nbmem, new_nbmem); |
1471 | new_elist = (lttng_event *) realloc(elist, | |
1472 | new_nbmem * sizeof(struct lttng_event)); | |
cd9adb8b | 1473 | if (new_elist == nullptr) { |
df0f840b | 1474 | PERROR("realloc list events"); |
3b870559 MD |
1475 | free(event); |
1476 | free(elist); | |
61b73b12 MD |
1477 | count = -ENOMEM; |
1478 | goto end; | |
2ef84c95 | 1479 | } |
53efb85a | 1480 | /* Zero the new memory */ |
28ab034a JG |
1481 | memset(new_elist + nbmem, |
1482 | 0, | |
1483 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
53efb85a | 1484 | nbmem = new_nbmem; |
3b870559 | 1485 | elist = new_elist; |
2ef84c95 | 1486 | } |
99497cd0 MD |
1487 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1488 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1489 | elist[count].enabled = -1; |
9f19cc17 | 1490 | count++; |
3b870559 | 1491 | free(event); |
2ef84c95 DG |
1492 | } |
1493 | ||
9f19cc17 | 1494 | *events = elist; |
ced2f820 | 1495 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1496 | end: |
28ab034a | 1497 | ret = fclose(fp); /* closes both fp and fd */ |
799e2c4f MD |
1498 | if (ret) { |
1499 | PERROR("fclose"); | |
1500 | } | |
9f19cc17 | 1501 | return count; |
2ef84c95 | 1502 | |
61b73b12 | 1503 | error_fp: |
799e2c4f MD |
1504 | ret = close(fd); |
1505 | if (ret) { | |
1506 | PERROR("close"); | |
1507 | } | |
2ef84c95 DG |
1508 | error: |
1509 | return -1; | |
1510 | } | |
096102bd DG |
1511 | |
1512 | /* | |
1513 | * Get kernel version and validate it. | |
1514 | */ | |
b8e2fb80 | 1515 | int kernel_validate_version(struct lttng_kernel_abi_tracer_version *version, |
28ab034a | 1516 | struct lttng_kernel_abi_tracer_abi_version *abi_version) |
096102bd DG |
1517 | { |
1518 | int ret; | |
096102bd | 1519 | |
7d268848 | 1520 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1521 | if (ret < 0) { |
521dd134 | 1522 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1523 | goto error; |
1524 | } | |
1525 | ||
1526 | /* Validate version */ | |
88076e89 | 1527 | if (version->major != VERSION_MAJOR) { |
c052142c | 1528 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
28ab034a JG |
1529 | version->major, |
1530 | VERSION_MAJOR); | |
096102bd | 1531 | goto error_version; |
096102bd | 1532 | } |
7d268848 | 1533 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1534 | if (ret < 0) { |
521dd134 | 1535 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1536 | goto error; |
1537 | } | |
b8e2fb80 | 1538 | if (abi_version->major != LTTNG_KERNEL_ABI_MAJOR_VERSION) { |
521dd134 | 1539 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
28ab034a JG |
1540 | abi_version->major, |
1541 | abi_version->minor, | |
1542 | LTTNG_KERNEL_ABI_MAJOR_VERSION); | |
c052142c MD |
1543 | goto error; |
1544 | } | |
1545 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
28ab034a JG |
1546 | version->major, |
1547 | version->minor, | |
1548 | abi_version->major, | |
1549 | abi_version->minor); | |
096102bd DG |
1550 | return 0; |
1551 | ||
1552 | error_version: | |
096102bd DG |
1553 | ret = -1; |
1554 | ||
1555 | error: | |
521dd134 | 1556 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1557 | return ret; |
1558 | } | |
335a95b7 MD |
1559 | |
1560 | /* | |
1561 | * Kernel work-arounds called at the start of sessiond main(). | |
1562 | */ | |
cd9adb8b | 1563 | int init_kernel_workarounds() |
335a95b7 | 1564 | { |
8936c33a | 1565 | int ret; |
335a95b7 MD |
1566 | FILE *fp; |
1567 | ||
1568 | /* | |
1569 | * boot_id needs to be read once before being used concurrently | |
1570 | * to deal with a Linux kernel race. A fix is proposed for | |
1571 | * upstream, but the work-around is needed for older kernels. | |
1572 | */ | |
1573 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1574 | if (!fp) { | |
1575 | goto end_boot_id; | |
1576 | } | |
1577 | while (!feof(fp)) { | |
1578 | char buf[37] = ""; | |
1579 | ||
8936c33a DG |
1580 | ret = fread(buf, 1, sizeof(buf), fp); |
1581 | if (ret < 0) { | |
1582 | /* Ignore error, we don't really care */ | |
1583 | } | |
335a95b7 | 1584 | } |
799e2c4f MD |
1585 | ret = fclose(fp); |
1586 | if (ret) { | |
1587 | PERROR("fclose"); | |
1588 | } | |
335a95b7 | 1589 | end_boot_id: |
335a95b7 MD |
1590 | return 0; |
1591 | } | |
2f77fc4b DG |
1592 | |
1593 | /* | |
d070c424 | 1594 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1595 | */ |
1596 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1597 | { | |
82b69413 JG |
1598 | struct lttng_trace_chunk *trace_chunk; |
1599 | ||
cd9adb8b | 1600 | if (ksess == nullptr) { |
2f77fc4b DG |
1601 | DBG3("No kernel session when tearing down session"); |
1602 | return; | |
1603 | } | |
1604 | ||
1605 | DBG("Tearing down kernel session"); | |
82b69413 | 1606 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1607 | |
07b86b52 | 1608 | /* |
15dc512a DG |
1609 | * Destroy channels on the consumer if at least one FD has been sent and we |
1610 | * are in no output mode because the streams are in *no* monitor mode so we | |
1611 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1612 | */ |
15dc512a | 1613 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1614 | int ret; |
1615 | struct consumer_socket *socket; | |
1616 | struct lttng_ht_iter iter; | |
1617 | ||
1618 | /* For each consumer socket. */ | |
56047f5a JG |
1619 | lttng::urcu::read_lock_guard read_lock; |
1620 | ||
28ab034a JG |
1621 | cds_lfht_for_each_entry ( |
1622 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
07b86b52 JD |
1623 | struct ltt_kernel_channel *chan; |
1624 | ||
1625 | /* For each channel, ask the consumer to destroy it. */ | |
28ab034a | 1626 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { |
07b86b52 JD |
1627 | ret = kernel_consumer_destroy_channel(socket, chan); |
1628 | if (ret < 0) { | |
1629 | /* Consumer is probably dead. Use next socket. */ | |
1630 | continue; | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | } | |
1635 | ||
2f77fc4b DG |
1636 | /* Close any relayd session */ |
1637 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1638 | ||
1639 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1640 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1641 | } |
fb5f35b6 | 1642 | |
d070c424 MD |
1643 | /* Teardown of data required by destroy notifiers. */ |
1644 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1645 | { | |
cd9adb8b | 1646 | if (ksess == nullptr) { |
d070c424 MD |
1647 | return; |
1648 | } | |
1649 | trace_kernel_free_session(ksess); | |
1650 | } | |
1651 | ||
fb5f35b6 DG |
1652 | /* |
1653 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1654 | */ | |
1655 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1656 | { | |
cd9adb8b | 1657 | struct ltt_kernel_session *ksess = nullptr; |
fb5f35b6 | 1658 | |
a0377dfe FD |
1659 | LTTNG_ASSERT(kchan); |
1660 | LTTNG_ASSERT(kchan->channel); | |
fb5f35b6 DG |
1661 | |
1662 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1663 | ||
1664 | /* Update channel count of associated session. */ | |
1665 | if (kchan->session) { | |
1666 | /* Keep pointer reference so we can update it after the destroy. */ | |
1667 | ksess = kchan->session; | |
1668 | } | |
1669 | ||
1670 | trace_kernel_destroy_channel(kchan); | |
1671 | ||
1672 | /* | |
1673 | * At this point the kernel channel is not visible anymore. This is safe | |
1674 | * since in order to work on a visible kernel session, the tracing session | |
1675 | * lock (ltt_session.lock) MUST be acquired. | |
1676 | */ | |
1677 | if (ksess) { | |
1678 | ksess->channel_count--; | |
1679 | } | |
1680 | } | |
6dc3064a DG |
1681 | |
1682 | /* | |
1683 | * Take a snapshot for a given kernel session. | |
1684 | * | |
9a654598 | 1685 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1686 | */ |
28ab034a JG |
1687 | enum lttng_error_code kernel_snapshot_record(struct ltt_kernel_session *ksess, |
1688 | const struct consumer_output *output, | |
1689 | uint64_t nb_packets_per_stream) | |
6dc3064a | 1690 | { |
2a06df8d | 1691 | int err, ret, saved_metadata_fd; |
9a654598 | 1692 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1693 | struct consumer_socket *socket; |
1694 | struct lttng_ht_iter iter; | |
1695 | struct ltt_kernel_metadata *saved_metadata; | |
cd9adb8b | 1696 | char *trace_path = nullptr; |
5da88b0f | 1697 | size_t consumer_path_offset = 0; |
6dc3064a | 1698 | |
a0377dfe FD |
1699 | LTTNG_ASSERT(ksess); |
1700 | LTTNG_ASSERT(ksess->consumer); | |
1701 | LTTNG_ASSERT(output); | |
6dc3064a DG |
1702 | |
1703 | DBG("Kernel snapshot record started"); | |
1704 | ||
1705 | /* Save current metadata since the following calls will change it. */ | |
1706 | saved_metadata = ksess->metadata; | |
1707 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1708 | ||
6dc3064a DG |
1709 | ret = kernel_open_metadata(ksess); |
1710 | if (ret < 0) { | |
9a654598 | 1711 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1712 | goto error; |
1713 | } | |
1714 | ||
1715 | ret = kernel_open_metadata_stream(ksess); | |
1716 | if (ret < 0) { | |
9a654598 | 1717 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1718 | goto error_open_stream; |
1719 | } | |
1720 | ||
28ab034a | 1721 | trace_path = setup_channel_trace_path(ksess->consumer, "", &consumer_path_offset); |
3b967712 MD |
1722 | if (!trace_path) { |
1723 | status = LTTNG_ERR_INVALID; | |
1724 | goto error; | |
1725 | } | |
6dc3064a | 1726 | |
56047f5a JG |
1727 | { |
1728 | /* Send metadata to consumer and snapshot everything. */ | |
1729 | lttng::urcu::read_lock_guard read_lock; | |
6dc3064a | 1730 | |
56047f5a JG |
1731 | cds_lfht_for_each_entry (output->socks->ht, &iter.iter, socket, node.node) { |
1732 | struct ltt_kernel_channel *chan; | |
1733 | ||
1734 | pthread_mutex_lock(socket->lock); | |
1735 | /* This stream must not be monitored by the consumer. */ | |
1736 | ret = kernel_consumer_add_metadata(socket, ksess, 0); | |
1737 | pthread_mutex_unlock(socket->lock); | |
1738 | if (ret < 0) { | |
1739 | status = LTTNG_ERR_KERN_META_FAIL; | |
1740 | goto error_consumer; | |
1741 | } | |
1742 | ||
1743 | /* For each channel, ask the consumer to snapshot it. */ | |
1744 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
1745 | status = | |
1746 | consumer_snapshot_channel(socket, | |
1747 | chan->key, | |
1748 | output, | |
1749 | 0, | |
1750 | &trace_path[consumer_path_offset], | |
1751 | nb_packets_per_stream); | |
1752 | if (status != LTTNG_OK) { | |
1753 | (void) kernel_consumer_destroy_metadata(socket, | |
1754 | ksess->metadata); | |
1755 | goto error_consumer; | |
1756 | } | |
1757 | } | |
1758 | ||
1759 | /* Snapshot metadata, */ | |
28ab034a | 1760 | status = consumer_snapshot_channel(socket, |
56047f5a | 1761 | ksess->metadata->key, |
28ab034a | 1762 | output, |
56047f5a | 1763 | 1, |
28ab034a | 1764 | &trace_path[consumer_path_offset], |
56047f5a | 1765 | 0); |
9a654598 | 1766 | if (status != LTTNG_OK) { |
6dc3064a DG |
1767 | goto error_consumer; |
1768 | } | |
6dc3064a | 1769 | |
56047f5a JG |
1770 | /* |
1771 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1772 | * it's not monitored on the consumer side. | |
1773 | */ | |
1774 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1775 | } |
1776 | } | |
1777 | ||
1778 | error_consumer: | |
1779 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1780 | err = close(ksess->metadata_stream_fd); |
1781 | if (err < 0) { | |
6dc3064a DG |
1782 | PERROR("close snapshot kernel"); |
1783 | } | |
1784 | ||
1785 | error_open_stream: | |
1786 | trace_kernel_destroy_metadata(ksess->metadata); | |
1787 | error: | |
1788 | /* Restore metadata state.*/ | |
1789 | ksess->metadata = saved_metadata; | |
1790 | ksess->metadata_stream_fd = saved_metadata_fd; | |
3b967712 | 1791 | free(trace_path); |
9a654598 | 1792 | return status; |
6dc3064a | 1793 | } |
834978fd DG |
1794 | |
1795 | /* | |
1796 | * Get the syscall mask array from the kernel tracer. | |
1797 | * | |
1798 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1799 | * be freed. | |
1800 | */ | |
1801 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1802 | { | |
a0377dfe FD |
1803 | LTTNG_ASSERT(syscall_mask); |
1804 | LTTNG_ASSERT(nr_bits); | |
834978fd DG |
1805 | |
1806 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1807 | } | |
6e21424e | 1808 | |
28ab034a | 1809 | static int kernel_tracer_abi_greater_or_equal(unsigned int major, unsigned int minor) |
6e21424e | 1810 | { |
959e3c66 | 1811 | int ret; |
b8e2fb80 | 1812 | struct lttng_kernel_abi_tracer_abi_version abi; |
6e21424e | 1813 | |
7d268848 | 1814 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1815 | if (ret < 0) { |
1816 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1817 | goto error; | |
1818 | } | |
1819 | ||
959e3c66 JR |
1820 | ret = abi.major > major || (abi.major == major && abi.minor >= minor); |
1821 | error: | |
1822 | return ret; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1827 | * version number. | |
1828 | * | |
1829 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1830 | * of errors. | |
1831 | */ | |
cd9adb8b | 1832 | int kernel_supports_ring_buffer_snapshot_sample_positions() |
959e3c66 | 1833 | { |
6e21424e JR |
1834 | /* |
1835 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1836 | */ | |
959e3c66 | 1837 | return kernel_tracer_abi_greater_or_equal(2, 3); |
6e21424e | 1838 | } |
5c408ad8 | 1839 | |
a40a503f MD |
1840 | /* |
1841 | * Check for the support of the packet sequence number via abi version number. | |
1842 | * | |
1843 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1844 | * of errors. | |
1845 | */ | |
cd9adb8b | 1846 | int kernel_supports_ring_buffer_packet_sequence_number() |
a40a503f | 1847 | { |
a40a503f | 1848 | /* |
3029bc92 JG |
1849 | * Packet sequence number was introduced in LTTng 2.8, |
1850 | * lttng-modules ABI 2.1. | |
a40a503f | 1851 | */ |
959e3c66 JR |
1852 | return kernel_tracer_abi_greater_or_equal(2, 1); |
1853 | } | |
1854 | ||
1855 | /* | |
1856 | * Check for the support of event notifiers via abi version number. | |
1857 | * | |
1858 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1859 | * of errors. | |
1860 | */ | |
cd9adb8b | 1861 | int kernel_supports_event_notifiers() |
959e3c66 JR |
1862 | { |
1863 | /* | |
1864 | * Event notifiers were introduced in LTTng 2.13, lttng-modules ABI 2.6. | |
1865 | */ | |
1866 | return kernel_tracer_abi_greater_or_equal(2, 6); | |
a40a503f MD |
1867 | } |
1868 | ||
5c408ad8 JD |
1869 | /* |
1870 | * Rotate a kernel session. | |
1871 | * | |
d5a1b7aa | 1872 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1873 | */ |
d5a1b7aa | 1874 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1875 | { |
1876 | int ret; | |
d5a1b7aa | 1877 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1878 | struct consumer_socket *socket; |
1879 | struct lttng_ht_iter iter; | |
1880 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1881 | ||
a0377dfe FD |
1882 | LTTNG_ASSERT(ksess); |
1883 | LTTNG_ASSERT(ksess->consumer); | |
5c408ad8 | 1884 | |
28ab034a | 1885 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", session->name, session->id); |
5c408ad8 | 1886 | |
56047f5a JG |
1887 | { |
1888 | /* | |
1889 | * Note that this loop will end after one iteration given that there is | |
1890 | * only one kernel consumer. | |
1891 | */ | |
1892 | lttng::urcu::read_lock_guard read_lock; | |
5c408ad8 | 1893 | |
56047f5a JG |
1894 | cds_lfht_for_each_entry ( |
1895 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
1896 | struct ltt_kernel_channel *chan; | |
1897 | ||
1898 | /* For each channel, ask the consumer to rotate it. */ | |
1899 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
1900 | DBG("Rotate kernel channel %" PRIu64 ", session %s", | |
1901 | chan->key, | |
1902 | session->name); | |
1903 | ret = consumer_rotate_channel(socket, | |
1904 | chan->key, | |
1905 | ksess->consumer, | |
1906 | /* is_metadata_channel */ false); | |
1907 | if (ret < 0) { | |
1908 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
1909 | goto error; | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | /* | |
1914 | * Rotate the metadata channel. | |
1915 | */ | |
28ab034a | 1916 | ret = consumer_rotate_channel(socket, |
56047f5a | 1917 | ksess->metadata->key, |
28ab034a | 1918 | ksess->consumer, |
56047f5a | 1919 | /* is_metadata_channel */ true); |
5c408ad8 | 1920 | if (ret < 0) { |
7e0de219 | 1921 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1922 | goto error; |
1923 | } | |
1924 | } | |
5c408ad8 JD |
1925 | } |
1926 | ||
5c408ad8 | 1927 | error: |
d5a1b7aa | 1928 | return status; |
5c408ad8 | 1929 | } |
d2956687 | 1930 | |
28ab034a | 1931 | enum lttng_error_code kernel_create_channel_subdirectories(const struct ltt_kernel_session *ksess) |
d2956687 JG |
1932 | { |
1933 | enum lttng_error_code ret = LTTNG_OK; | |
1934 | enum lttng_trace_chunk_status chunk_status; | |
1935 | ||
56047f5a | 1936 | lttng::urcu::read_lock_guard read_lock; |
a0377dfe | 1937 | LTTNG_ASSERT(ksess->current_trace_chunk); |
d2956687 JG |
1938 | |
1939 | /* | |
1940 | * Create the index subdirectory which will take care | |
1941 | * of implicitly creating the channel's path. | |
1942 | */ | |
1943 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
28ab034a | 1944 | ksess->current_trace_chunk, DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); |
d2956687 JG |
1945 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
1946 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1947 | goto error; | |
1948 | } | |
1949 | error: | |
d2956687 JG |
1950 | return ret; |
1951 | } | |
7d268848 MD |
1952 | |
1953 | /* | |
1954 | * Setup necessary data for kernel tracer action. | |
1955 | */ | |
cd9adb8b | 1956 | int init_kernel_tracer() |
7d268848 MD |
1957 | { |
1958 | int ret; | |
1959 | bool is_root = !getuid(); | |
1960 | ||
1961 | /* Modprobe lttng kernel modules */ | |
1962 | ret = modprobe_lttng_control(); | |
1963 | if (ret < 0) { | |
1964 | goto error; | |
1965 | } | |
1966 | ||
1967 | /* Open debugfs lttng */ | |
1968 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1969 | if (kernel_tracer_fd < 0) { | |
1970 | DBG("Failed to open %s", module_proc_lttng); | |
1971 | goto error_open; | |
1972 | } | |
1973 | ||
1974 | /* Validate kernel version */ | |
28ab034a | 1975 | ret = kernel_validate_version(&the_kernel_tracer_version, &the_kernel_tracer_abi_version); |
7d268848 MD |
1976 | if (ret < 0) { |
1977 | goto error_version; | |
1978 | } | |
1979 | ||
1980 | ret = modprobe_lttng_data(); | |
1981 | if (ret < 0) { | |
1982 | goto error_modules; | |
1983 | } | |
1984 | ||
1985 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1986 | if (ret < 0) { | |
1987 | goto error_modules; | |
1988 | } | |
7d268848 MD |
1989 | if (ret < 1) { |
1990 | WARN("Kernel tracer does not support buffer monitoring. " | |
28ab034a JG |
1991 | "The monitoring timer of channels in the kernel domain " |
1992 | "will be set to 0 (disabled)."); | |
7d268848 MD |
1993 | } |
1994 | ||
352b58f5 JR |
1995 | ret = kernel_supports_event_notifiers(); |
1996 | if (ret < 0) { | |
1997 | ERR("Failed to check for kernel tracer event notifier support"); | |
1998 | goto error_modules; | |
1999 | } | |
2000 | ret = kernel_create_event_notifier_group(&kernel_tracer_event_notifier_group_fd); | |
2001 | if (ret < 0) { | |
2002 | /* This is not fatal. */ | |
2003 | WARN("Failed to create kernel event notifier group"); | |
2004 | kernel_tracer_event_notifier_group_fd = -1; | |
2005 | } else { | |
90aa04a1 FD |
2006 | enum event_notifier_error_accounting_status error_accounting_status; |
2007 | enum lttng_error_code error_code_ret = | |
28ab034a JG |
2008 | kernel_create_event_notifier_group_notification_fd( |
2009 | &kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
2010 | |
2011 | if (error_code_ret != LTTNG_OK) { | |
2012 | goto error_modules; | |
2013 | } | |
2014 | ||
90aa04a1 | 2015 | error_accounting_status = event_notifier_error_accounting_register_kernel( |
28ab034a | 2016 | kernel_tracer_event_notifier_group_fd); |
90aa04a1 FD |
2017 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
2018 | ERR("Failed to initialize event notifier error accounting for kernel tracer"); | |
2019 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING; | |
2020 | goto error_modules; | |
2021 | } | |
2022 | ||
352b58f5 | 2023 | kernel_token_to_event_notifier_rule_ht = cds_lfht_new( |
cd9adb8b | 2024 | DEFAULT_HT_SIZE, 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, nullptr); |
352b58f5 JR |
2025 | if (!kernel_token_to_event_notifier_rule_ht) { |
2026 | goto error_token_ht; | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | DBG("Kernel tracer initialized: kernel tracer fd = %d, event notifier group fd = %d, event notifier group notification fd = %d", | |
28ab034a JG |
2031 | kernel_tracer_fd, |
2032 | kernel_tracer_event_notifier_group_fd, | |
2033 | kernel_tracer_event_notifier_group_notification_fd); | |
7d268848 MD |
2034 | |
2035 | ret = syscall_init_table(kernel_tracer_fd); | |
2036 | if (ret < 0) { | |
2037 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
28ab034a | 2038 | "work for this session daemon."); |
7d268848 | 2039 | } |
352b58f5 | 2040 | |
7d268848 MD |
2041 | return 0; |
2042 | ||
2043 | error_version: | |
2044 | modprobe_remove_lttng_control(); | |
2045 | ret = close(kernel_tracer_fd); | |
2046 | if (ret) { | |
28ab034a | 2047 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 | 2048 | } |
6dcf80d3 | 2049 | |
7d268848 MD |
2050 | kernel_tracer_fd = -1; |
2051 | return LTTNG_ERR_KERN_VERSION; | |
2052 | ||
352b58f5 JR |
2053 | error_token_ht: |
2054 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2055 | if (ret) { | |
2056 | PERROR("Failed to close kernel tracer event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2057 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2058 | } |
2059 | ||
6dcf80d3 JG |
2060 | kernel_tracer_event_notifier_group_notification_fd = -1; |
2061 | ||
7d268848 | 2062 | error_modules: |
352b58f5 JR |
2063 | ret = close(kernel_tracer_event_notifier_group_fd); |
2064 | if (ret) { | |
2065 | PERROR("Failed to close kernel tracer event notifier group file descriptor: fd = %d", | |
28ab034a | 2066 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2067 | } |
2068 | ||
6dcf80d3 JG |
2069 | kernel_tracer_event_notifier_group_fd = -1; |
2070 | ||
7d268848 MD |
2071 | ret = close(kernel_tracer_fd); |
2072 | if (ret) { | |
28ab034a | 2073 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", kernel_tracer_fd); |
7d268848 MD |
2074 | } |
2075 | ||
6dcf80d3 JG |
2076 | kernel_tracer_fd = -1; |
2077 | ||
7d268848 MD |
2078 | error_open: |
2079 | modprobe_remove_lttng_control(); | |
2080 | ||
2081 | error: | |
2082 | WARN("No kernel tracer available"); | |
2083 | kernel_tracer_fd = -1; | |
2084 | if (!is_root) { | |
2085 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2086 | } else { | |
2087 | return LTTNG_ERR_KERN_NA; | |
2088 | } | |
2089 | } | |
2090 | ||
cd9adb8b | 2091 | void cleanup_kernel_tracer() |
7d268848 | 2092 | { |
352b58f5 JR |
2093 | DBG2("Closing kernel event notifier group notification file descriptor"); |
2094 | if (kernel_tracer_event_notifier_group_notification_fd >= 0) { | |
b69a1b40 | 2095 | int ret = notification_thread_command_remove_tracer_event_source( |
28ab034a JG |
2096 | the_notification_thread_handle, |
2097 | kernel_tracer_event_notifier_group_notification_fd); | |
352b58f5 JR |
2098 | if (ret != LTTNG_OK) { |
2099 | ERR("Failed to remove kernel event notifier notification from notification thread"); | |
2100 | } | |
2101 | ||
2102 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2103 | if (ret) { | |
2104 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2105 | kernel_tracer_event_notifier_group_notification_fd); |
352b58f5 JR |
2106 | } |
2107 | ||
2108 | kernel_tracer_event_notifier_group_notification_fd = -1; | |
2109 | } | |
2110 | ||
2111 | if (kernel_token_to_event_notifier_rule_ht) { | |
cd9adb8b | 2112 | const int ret = cds_lfht_destroy(kernel_token_to_event_notifier_rule_ht, nullptr); |
a0377dfe | 2113 | LTTNG_ASSERT(ret == 0); |
352b58f5 JR |
2114 | } |
2115 | ||
2116 | DBG2("Closing kernel event notifier group file descriptor"); | |
2117 | if (kernel_tracer_event_notifier_group_fd >= 0) { | |
b69a1b40 JG |
2118 | const int ret = close(kernel_tracer_event_notifier_group_fd); |
2119 | ||
352b58f5 JR |
2120 | if (ret) { |
2121 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
28ab034a | 2122 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2123 | } |
2124 | ||
2125 | kernel_tracer_event_notifier_group_fd = -1; | |
2126 | } | |
7d268848 MD |
2127 | |
2128 | DBG2("Closing kernel fd"); | |
2129 | if (kernel_tracer_fd >= 0) { | |
b69a1b40 JG |
2130 | const int ret = close(kernel_tracer_fd); |
2131 | ||
7d268848 | 2132 | if (ret) { |
352b58f5 | 2133 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
28ab034a | 2134 | kernel_tracer_fd); |
7d268848 | 2135 | } |
352b58f5 | 2136 | |
7d268848 MD |
2137 | kernel_tracer_fd = -1; |
2138 | } | |
352b58f5 | 2139 | |
7d268848 MD |
2140 | free(syscall_table); |
2141 | } | |
2142 | ||
cd9adb8b | 2143 | bool kernel_tracer_is_initialized() |
7d268848 MD |
2144 | { |
2145 | return kernel_tracer_fd >= 0; | |
2146 | } | |
bca212a2 MD |
2147 | |
2148 | /* | |
2149 | * Clear a kernel session. | |
2150 | * | |
2151 | * Return LTTNG_OK on success or else an LTTng error code. | |
2152 | */ | |
2153 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2154 | { | |
2155 | int ret; | |
2156 | enum lttng_error_code status = LTTNG_OK; | |
2157 | struct consumer_socket *socket; | |
2158 | struct lttng_ht_iter iter; | |
2159 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2160 | ||
a0377dfe FD |
2161 | LTTNG_ASSERT(ksess); |
2162 | LTTNG_ASSERT(ksess->consumer); | |
bca212a2 | 2163 | |
28ab034a | 2164 | DBG("Clear kernel session %s (session %" PRIu64 ")", session->name, session->id); |
bca212a2 | 2165 | |
bca212a2 MD |
2166 | if (ksess->active) { |
2167 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2168 | status = LTTNG_ERR_FATAL; | |
2169 | goto end; | |
2170 | } | |
2171 | ||
56047f5a JG |
2172 | { |
2173 | /* | |
2174 | * Note that this loop will end after one iteration given that there is | |
2175 | * only one kernel consumer. | |
2176 | */ | |
2177 | lttng::urcu::read_lock_guard read_lock; | |
2178 | ||
2179 | cds_lfht_for_each_entry ( | |
2180 | ksess->consumer->socks->ht, &iter.iter, socket, node.node) { | |
2181 | struct ltt_kernel_channel *chan; | |
2182 | ||
2183 | /* For each channel, ask the consumer to clear it. */ | |
2184 | cds_list_for_each_entry (chan, &ksess->channel_list.head, list) { | |
2185 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
2186 | chan->key, | |
2187 | session->name); | |
2188 | ret = consumer_clear_channel(socket, chan->key); | |
2189 | if (ret < 0) { | |
2190 | goto error; | |
2191 | } | |
2192 | } | |
2193 | ||
2194 | if (!ksess->metadata) { | |
2195 | /* | |
2196 | * Nothing to do for the metadata. | |
2197 | * This is a snapshot session. | |
2198 | * The metadata is genererated on the fly. | |
2199 | */ | |
2200 | continue; | |
bca212a2 | 2201 | } |
bca212a2 | 2202 | |
bca212a2 | 2203 | /* |
56047f5a JG |
2204 | * Clear the metadata channel. |
2205 | * Metadata channel is not cleared per se but we still need to | |
2206 | * perform a rotation operation on it behind the scene. | |
bca212a2 | 2207 | */ |
56047f5a JG |
2208 | ret = consumer_clear_channel(socket, ksess->metadata->key); |
2209 | if (ret < 0) { | |
2210 | goto error; | |
2211 | } | |
bca212a2 MD |
2212 | } |
2213 | } | |
2214 | ||
2215 | goto end; | |
2216 | error: | |
2217 | switch (-ret) { | |
2218 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
28ab034a JG |
2219 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; |
2220 | break; | |
bca212a2 | 2221 | default: |
28ab034a JG |
2222 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; |
2223 | break; | |
bca212a2 MD |
2224 | } |
2225 | end: | |
bca212a2 MD |
2226 | return status; |
2227 | } | |
352b58f5 | 2228 | |
28ab034a JG |
2229 | enum lttng_error_code |
2230 | kernel_create_event_notifier_group_notification_fd(int *event_notifier_group_notification_fd) | |
352b58f5 JR |
2231 | { |
2232 | int local_fd = -1, ret; | |
2233 | enum lttng_error_code error_code_ret; | |
2234 | ||
a0377dfe | 2235 | LTTNG_ASSERT(event_notifier_group_notification_fd); |
352b58f5 JR |
2236 | |
2237 | ret = kernctl_create_event_notifier_group_notification_fd( | |
28ab034a | 2238 | kernel_tracer_event_notifier_group_fd); |
352b58f5 JR |
2239 | if (ret < 0) { |
2240 | PERROR("Failed to create kernel event notifier group notification file descriptor"); | |
2241 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2242 | goto error; | |
2243 | } | |
2244 | ||
2245 | local_fd = ret; | |
2246 | ||
2247 | /* Prevent fd duplication after execlp(). */ | |
2248 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2249 | if (ret < 0) { | |
2250 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2251 | local_fd); |
352b58f5 JR |
2252 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; |
2253 | goto error; | |
2254 | } | |
2255 | ||
28ab034a | 2256 | DBG("Created kernel notifier group notification file descriptor: fd = %d", local_fd); |
352b58f5 JR |
2257 | error_code_ret = LTTNG_OK; |
2258 | *event_notifier_group_notification_fd = local_fd; | |
2259 | local_fd = -1; | |
2260 | ||
2261 | error: | |
2262 | if (local_fd >= 0) { | |
2263 | ret = close(local_fd); | |
2264 | if (ret) { | |
2265 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2266 | local_fd); |
352b58f5 JR |
2267 | } |
2268 | } | |
2269 | ||
2270 | return error_code_ret; | |
2271 | } | |
2272 | ||
28ab034a JG |
2273 | enum lttng_error_code |
2274 | kernel_destroy_event_notifier_group_notification_fd(int event_notifier_group_notification_fd) | |
352b58f5 JR |
2275 | { |
2276 | enum lttng_error_code ret_code = LTTNG_OK; | |
2277 | ||
2278 | DBG("Closing event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2279 | event_notifier_group_notification_fd); |
352b58f5 JR |
2280 | if (event_notifier_group_notification_fd >= 0) { |
2281 | const int ret = close(event_notifier_group_notification_fd); | |
2282 | if (ret) { | |
2283 | PERROR("Failed to close event notifier group notification file descriptor: fd = %d", | |
28ab034a | 2284 | event_notifier_group_notification_fd); |
352b58f5 JR |
2285 | } |
2286 | } | |
2287 | ||
2288 | return ret_code; | |
2289 | } | |
2290 | ||
28ab034a | 2291 | static unsigned long hash_trigger(const struct lttng_trigger *trigger) |
352b58f5 | 2292 | { |
28ab034a | 2293 | const struct lttng_condition *condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2294 | |
2295 | return lttng_condition_hash(condition); | |
2296 | } | |
2297 | ||
28ab034a | 2298 | static int match_trigger(struct cds_lfht_node *node, const void *key) |
352b58f5 JR |
2299 | { |
2300 | const struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
7966af57 | 2301 | const struct lttng_trigger *trigger = (lttng_trigger *) key; |
352b58f5 | 2302 | |
28ab034a JG |
2303 | event_notifier_rule = |
2304 | caa_container_of(node, const struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2305 | |
2306 | return lttng_trigger_is_equal(trigger, event_notifier_rule->trigger); | |
2307 | } | |
2308 | ||
2309 | static enum lttng_error_code kernel_create_event_notifier_rule( | |
28ab034a | 2310 | struct lttng_trigger *trigger, const struct lttng_credentials *creds, uint64_t token) |
352b58f5 JR |
2311 | { |
2312 | int err, fd, ret = 0; | |
2313 | enum lttng_error_code error_code_ret; | |
2314 | enum lttng_condition_status condition_status; | |
2315 | enum lttng_condition_type condition_type; | |
2316 | enum lttng_event_rule_type event_rule_type; | |
2317 | struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
b8e2fb80 | 2318 | struct lttng_kernel_abi_event_notifier kernel_event_notifier = {}; |
bbd6675c | 2319 | unsigned int capture_bytecode_count = 0, i; |
cd9adb8b JG |
2320 | const struct lttng_condition *condition = nullptr; |
2321 | const struct lttng_event_rule *event_rule = nullptr; | |
bbd6675c | 2322 | enum lttng_condition_status cond_status; |
352b58f5 | 2323 | |
a0377dfe | 2324 | LTTNG_ASSERT(trigger); |
352b58f5 JR |
2325 | |
2326 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 2327 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2328 | |
2329 | condition_type = lttng_condition_get_type(condition); | |
a0377dfe | 2330 | LTTNG_ASSERT(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
352b58f5 JR |
2331 | |
2332 | /* Does not acquire a reference. */ | |
28ab034a | 2333 | condition_status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe FD |
2334 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
2335 | LTTNG_ASSERT(event_rule); | |
352b58f5 JR |
2336 | |
2337 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
a0377dfe | 2338 | LTTNG_ASSERT(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); |
352b58f5 | 2339 | |
28ab034a JG |
2340 | error_code_ret = trace_kernel_create_event_notifier_rule( |
2341 | trigger, | |
2342 | token, | |
2343 | lttng_condition_event_rule_matches_get_error_counter_index(condition), | |
2344 | &event_notifier_rule); | |
352b58f5 JR |
2345 | if (error_code_ret != LTTNG_OK) { |
2346 | goto error; | |
2347 | } | |
2348 | ||
28ab034a JG |
2349 | error_code_ret = trace_kernel_init_event_notifier_from_event_rule(event_rule, |
2350 | &kernel_event_notifier); | |
352b58f5 | 2351 | if (error_code_ret != LTTNG_OK) { |
b5e3b044 | 2352 | goto free_event; |
352b58f5 JR |
2353 | } |
2354 | ||
2355 | kernel_event_notifier.event.token = event_notifier_rule->token; | |
90aa04a1 | 2356 | kernel_event_notifier.error_counter_idx = |
28ab034a | 2357 | lttng_condition_event_rule_matches_get_error_counter_index(condition); |
352b58f5 | 2358 | |
28ab034a JG |
2359 | fd = kernctl_create_event_notifier(kernel_tracer_event_notifier_group_fd, |
2360 | &kernel_event_notifier); | |
352b58f5 JR |
2361 | if (fd < 0) { |
2362 | switch (-fd) { | |
2363 | case EEXIST: | |
2364 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2365 | break; | |
2366 | case ENOSYS: | |
2367 | WARN("Failed to create kernel event notifier: not notifier type not implemented"); | |
2368 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2369 | break; | |
2370 | case ENOENT: | |
2371 | WARN("Failed to create kernel event notifier: not found: name = '%s'", | |
28ab034a | 2372 | kernel_event_notifier.event.name); |
352b58f5 JR |
2373 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2374 | break; | |
2375 | default: | |
2376 | PERROR("Failed to create kernel event notifier: error code = %d, name = '%s'", | |
28ab034a JG |
2377 | fd, |
2378 | kernel_event_notifier.event.name); | |
352b58f5 JR |
2379 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
2380 | } | |
2381 | goto free_event; | |
2382 | } | |
2383 | ||
2384 | event_notifier_rule->fd = fd; | |
2385 | /* Prevent fd duplication after execlp(). */ | |
2386 | err = fcntl(event_notifier_rule->fd, F_SETFD, FD_CLOEXEC); | |
2387 | if (err < 0) { | |
2388 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier file descriptor: fd = %d", | |
28ab034a | 2389 | fd); |
352b58f5 JR |
2390 | error_code_ret = LTTNG_ERR_FATAL; |
2391 | goto set_cloexec_error; | |
2392 | } | |
2393 | ||
2394 | if (event_notifier_rule->filter) { | |
2395 | err = kernctl_filter(event_notifier_rule->fd, event_notifier_rule->filter); | |
2396 | if (err < 0) { | |
2397 | switch (-err) { | |
2398 | case ENOMEM: | |
2399 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2400 | break; | |
2401 | default: | |
2402 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2403 | break; | |
2404 | } | |
2405 | goto filter_error; | |
2406 | } | |
2407 | } | |
2408 | ||
28ab034a | 2409 | if (lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) { |
352b58f5 | 2410 | ret = userspace_probe_event_rule_add_callsites( |
28ab034a | 2411 | event_rule, creds, event_notifier_rule->fd); |
352b58f5 JR |
2412 | if (ret) { |
2413 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2414 | goto add_callsite_error; | |
2415 | } | |
2416 | } | |
2417 | ||
d602bd6a | 2418 | /* Set the capture bytecode if any. */ |
8dbb86b8 | 2419 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
28ab034a | 2420 | condition, &capture_bytecode_count); |
a0377dfe | 2421 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
bbd6675c JR |
2422 | |
2423 | for (i = 0; i < capture_bytecode_count; i++) { | |
2424 | const struct lttng_bytecode *capture_bytecode = | |
28ab034a JG |
2425 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index(condition, |
2426 | i); | |
bbd6675c | 2427 | |
cd9adb8b | 2428 | if (capture_bytecode == nullptr) { |
bbd6675c JR |
2429 | ERR("Unexpected NULL capture bytecode on condition"); |
2430 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2431 | goto capture_error; |
bbd6675c JR |
2432 | } |
2433 | ||
2434 | ret = kernctl_capture(event_notifier_rule->fd, capture_bytecode); | |
2435 | if (ret < 0) { | |
2436 | ERR("Failed to set capture bytecode on event notifier rule fd: fd = %d", | |
28ab034a | 2437 | event_notifier_rule->fd); |
bbd6675c | 2438 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
e8b1187d | 2439 | goto capture_error; |
bbd6675c JR |
2440 | } |
2441 | } | |
2442 | ||
352b58f5 JR |
2443 | err = kernctl_enable(event_notifier_rule->fd); |
2444 | if (err < 0) { | |
2445 | switch (-err) { | |
2446 | case EEXIST: | |
2447 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2448 | break; | |
2449 | default: | |
2450 | PERROR("enable kernel event notifier"); | |
2451 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2452 | break; | |
2453 | } | |
2454 | goto enable_error; | |
2455 | } | |
2456 | ||
2457 | /* Add trigger to kernel token mapping in the hash table. */ | |
56047f5a JG |
2458 | { |
2459 | lttng::urcu::read_lock_guard read_lock; | |
2460 | cds_lfht_add(kernel_token_to_event_notifier_rule_ht, | |
2461 | hash_trigger(trigger), | |
2462 | &event_notifier_rule->ht_node); | |
2463 | } | |
352b58f5 JR |
2464 | |
2465 | DBG("Created kernel event notifier: name = '%s', fd = %d", | |
28ab034a JG |
2466 | kernel_event_notifier.event.name, |
2467 | event_notifier_rule->fd); | |
352b58f5 JR |
2468 | |
2469 | return LTTNG_OK; | |
2470 | ||
e8b1187d | 2471 | capture_error: |
352b58f5 JR |
2472 | add_callsite_error: |
2473 | enable_error: | |
2474 | set_cloexec_error: | |
2475 | filter_error: | |
28ab034a JG |
2476 | { |
2477 | const int close_ret = close(event_notifier_rule->fd); | |
352b58f5 | 2478 | |
28ab034a JG |
2479 | if (close_ret) { |
2480 | PERROR("Failed to close kernel event notifier file descriptor: fd = %d", | |
2481 | event_notifier_rule->fd); | |
352b58f5 | 2482 | } |
28ab034a | 2483 | } |
352b58f5 JR |
2484 | free_event: |
2485 | free(event_notifier_rule); | |
2486 | error: | |
2487 | return error_code_ret; | |
2488 | } | |
2489 | ||
28ab034a JG |
2490 | enum lttng_error_code kernel_register_event_notifier(struct lttng_trigger *trigger, |
2491 | const struct lttng_credentials *cmd_creds) | |
352b58f5 JR |
2492 | { |
2493 | enum lttng_error_code ret; | |
2494 | enum lttng_condition_status status; | |
2495 | enum lttng_domain_type domain_type; | |
2496 | const struct lttng_event_rule *event_rule; | |
28ab034a | 2497 | const struct lttng_condition *const condition = lttng_trigger_get_const_condition(trigger); |
352b58f5 JR |
2498 | const uint64_t token = lttng_trigger_get_tracer_token(trigger); |
2499 | ||
a0377dfe | 2500 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2501 | |
2502 | /* Does not acquire a reference to the event rule. */ | |
28ab034a | 2503 | status = lttng_condition_event_rule_matches_get_rule(condition, &event_rule); |
a0377dfe | 2504 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
352b58f5 JR |
2505 | |
2506 | domain_type = lttng_event_rule_get_domain_type(event_rule); | |
a0377dfe | 2507 | LTTNG_ASSERT(domain_type == LTTNG_DOMAIN_KERNEL); |
352b58f5 JR |
2508 | |
2509 | ret = kernel_create_event_notifier_rule(trigger, cmd_creds, token); | |
2510 | if (ret != LTTNG_OK) { | |
124dda43 | 2511 | ERR("Failed to create kernel event notifier rule"); |
352b58f5 JR |
2512 | } |
2513 | ||
2514 | return ret; | |
2515 | } | |
2516 | ||
28ab034a | 2517 | enum lttng_error_code kernel_unregister_event_notifier(const struct lttng_trigger *trigger) |
352b58f5 JR |
2518 | { |
2519 | struct ltt_kernel_event_notifier_rule *token_event_rule_element; | |
2520 | struct cds_lfht_node *node; | |
2521 | struct cds_lfht_iter iter; | |
2522 | enum lttng_error_code error_code_ret; | |
2523 | int ret; | |
2524 | ||
56047f5a | 2525 | lttng::urcu::read_lock_guard read_lock; |
352b58f5 JR |
2526 | |
2527 | cds_lfht_lookup(kernel_token_to_event_notifier_rule_ht, | |
28ab034a JG |
2528 | hash_trigger(trigger), |
2529 | match_trigger, | |
2530 | trigger, | |
2531 | &iter); | |
352b58f5 JR |
2532 | |
2533 | node = cds_lfht_iter_get_node(&iter); | |
2534 | if (!node) { | |
2535 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2536 | goto error; | |
2537 | } | |
2538 | ||
28ab034a JG |
2539 | token_event_rule_element = |
2540 | caa_container_of(node, struct ltt_kernel_event_notifier_rule, ht_node); | |
352b58f5 JR |
2541 | |
2542 | ret = kernel_disable_event_notifier_rule(token_event_rule_element); | |
2543 | if (ret) { | |
2544 | error_code_ret = LTTNG_ERR_FATAL; | |
2545 | goto error; | |
2546 | } | |
2547 | ||
2548 | trace_kernel_destroy_event_notifier_rule(token_event_rule_element); | |
2549 | error_code_ret = LTTNG_OK; | |
2550 | ||
2551 | error: | |
352b58f5 JR |
2552 | |
2553 | return error_code_ret; | |
2554 | } | |
2555 | ||
cd9adb8b | 2556 | int kernel_get_notification_fd() |
352b58f5 JR |
2557 | { |
2558 | return kernel_tracer_event_notifier_group_notification_fd; | |
2559 | } |