Commit | Line | Data |
---|---|---|
20fe2104 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
20fe2104 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
20fe2104 | 5 | * |
20fe2104 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
7b395890 | 9 | #include <fcntl.h> |
20fe2104 DG |
10 | #include <stdlib.h> |
11 | #include <stdio.h> | |
f34daff7 | 12 | #include <string.h> |
8c0faa1d | 13 | #include <unistd.h> |
77c7c900 | 14 | #include <inttypes.h> |
7d268848 | 15 | #include <sys/types.h> |
20fe2104 | 16 | |
990570ed | 17 | #include <common/common.h> |
2463b787 | 18 | #include <common/hashtable/utils.h> |
82b69413 | 19 | #include <common/trace-chunk.h> |
db758600 | 20 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 21 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 22 | #include <common/sessiond-comm/sessiond-comm.h> |
c5bf436c JG |
23 | #include <common/tracker.h> |
24 | #include <common/utils.h> | |
25 | #include <lttng/event.h> | |
26 | #include <lttng/lttng-error.h> | |
27 | #include <lttng/tracker.h> | |
1e307fab | 28 | |
2463b787 JR |
29 | #include <lttng/userspace-probe.h> |
30 | #include <lttng/userspace-probe-internal.h> | |
31 | #include <lttng/condition/event-rule.h> | |
32 | #include <lttng/condition/event-rule-internal.h> | |
33 | #include <lttng/event-rule/event-rule.h> | |
34 | #include <lttng/event-rule/event-rule-internal.h> | |
35 | #include <lttng/event-rule/uprobe-internal.h> | |
36 | ||
7d268848 MD |
37 | #include "lttng-sessiond.h" |
38 | #include "lttng-syscall.h" | |
2463b787 | 39 | #include "condition-internal.h" |
2f77fc4b | 40 | #include "consumer.h" |
4771f025 | 41 | #include "kernel.h" |
6dc3064a | 42 | #include "kernel-consumer.h" |
096102bd | 43 | #include "kern-modules.h" |
2463b787 | 44 | #include "sessiond-config.h" |
834978fd | 45 | #include "utils.h" |
5c408ad8 | 46 | #include "rotate.h" |
7d268848 | 47 | #include "modprobe.h" |
c5bf436c | 48 | #include "tracker.h" |
2463b787 JR |
49 | #include "trigger-error-accounting.h" |
50 | #include "notification-thread-commands.h" | |
20fe2104 | 51 | |
e1f3997a JD |
52 | /* |
53 | * Key used to reference a channel between the sessiond and the consumer. This | |
54 | * is only read and updated with the session_list lock held. | |
55 | */ | |
56 | static uint64_t next_kernel_channel_key; | |
57 | ||
7d268848 MD |
58 | static const char *module_proc_lttng = "/proc/lttng"; |
59 | ||
60 | static int kernel_tracer_fd = -1; | |
2463b787 JR |
61 | static int kernel_tracer_trigger_group_fd = -1; |
62 | static int kernel_tracer_trigger_group_notification_fd = -1; | |
63 | static struct cds_lfht *kernel_tracer_token_ht; | |
7d268848 | 64 | |
d65106b1 | 65 | /* |
050349bb | 66 | * Add context on a kernel channel. |
df3c77c8 JG |
67 | * |
68 | * Assumes the ownership of ctx. | |
d65106b1 DG |
69 | */ |
70 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 71 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
72 | { |
73 | int ret; | |
74 | ||
0525e9ae DG |
75 | assert(chan); |
76 | assert(ctx); | |
77 | ||
d65106b1 | 78 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 79 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 80 | if (ret < 0) { |
32af2c95 | 81 | switch (-ret) { |
1ae5e83e JD |
82 | case ENOSYS: |
83 | /* Exists but not available for this kernel */ | |
84 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
85 | goto error; | |
86 | case EEXIST: | |
b579acd9 DG |
87 | /* If EEXIST, we just ignore the error */ |
88 | ret = 0; | |
1ae5e83e JD |
89 | goto end; |
90 | default: | |
91 | PERROR("add context ioctl"); | |
92 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
93 | goto error; | |
b579acd9 | 94 | } |
d65106b1 | 95 | } |
21ed98c1 | 96 | ret = 0; |
d65106b1 | 97 | |
1ae5e83e | 98 | end: |
645328ae | 99 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 100 | ctx->in_list = true; |
df3c77c8 | 101 | ctx = NULL; |
d65106b1 | 102 | error: |
df3c77c8 JG |
103 | if (ctx) { |
104 | trace_kernel_destroy_context(ctx); | |
105 | } | |
d65106b1 DG |
106 | return ret; |
107 | } | |
108 | ||
20fe2104 | 109 | /* |
050349bb DG |
110 | * Create a new kernel session, register it to the kernel tracer and add it to |
111 | * the session daemon session. | |
20fe2104 | 112 | */ |
7d268848 | 113 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
114 | { |
115 | int ret; | |
116 | struct ltt_kernel_session *lks; | |
117 | ||
0525e9ae DG |
118 | assert(session); |
119 | ||
54012638 | 120 | /* Allocate data structure */ |
dec56f6c | 121 | lks = trace_kernel_create_session(); |
20fe2104 | 122 | if (lks == NULL) { |
54012638 | 123 | ret = -1; |
20fe2104 DG |
124 | goto error; |
125 | } | |
126 | ||
54012638 | 127 | /* Kernel tracer session creation */ |
7d268848 | 128 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 129 | if (ret < 0) { |
df0f840b | 130 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
131 | goto error; |
132 | } | |
133 | ||
20fe2104 | 134 | lks->fd = ret; |
7b395890 DG |
135 | /* Prevent fd duplication after execlp() */ |
136 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
137 | if (ret < 0) { | |
df0f840b | 138 | PERROR("fcntl session fd"); |
7b395890 DG |
139 | } |
140 | ||
53632229 | 141 | lks->id = session->id; |
3bd1e081 | 142 | lks->consumer_fds_sent = 0; |
8c0faa1d | 143 | session->kernel_session = lks; |
8c0faa1d DG |
144 | |
145 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 146 | |
8ff4109e JR |
147 | /* |
148 | * This is necessary since the creation time is present in the session | |
149 | * name when it is generated. | |
150 | */ | |
151 | if (session->has_auto_generated_name) { | |
152 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
153 | } else { | |
154 | ret = kernctl_session_set_name(lks->fd, session->name); | |
155 | } | |
156 | if (ret) { | |
157 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
158 | session->id, session->name); | |
159 | } | |
160 | ||
e04b2181 JR |
161 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
162 | if (ret) { | |
163 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
164 | session->id, session->name); | |
165 | } | |
166 | ||
20fe2104 DG |
167 | return 0; |
168 | ||
169 | error: | |
5f62c685 DG |
170 | if (lks) { |
171 | trace_kernel_destroy_session(lks); | |
d070c424 | 172 | trace_kernel_free_session(lks); |
5f62c685 | 173 | } |
20fe2104 DG |
174 | return ret; |
175 | } | |
176 | ||
177 | /* | |
050349bb DG |
178 | * Create a kernel channel, register it to the kernel tracer and add it to the |
179 | * kernel session. | |
20fe2104 | 180 | */ |
050349bb | 181 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 182 | struct lttng_channel *chan) |
20fe2104 DG |
183 | { |
184 | int ret; | |
185 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 186 | |
0525e9ae DG |
187 | assert(session); |
188 | assert(chan); | |
0525e9ae | 189 | |
54012638 | 190 | /* Allocate kernel channel */ |
fdd9eb17 | 191 | lkc = trace_kernel_create_channel(chan); |
54012638 | 192 | if (lkc == NULL) { |
20fe2104 DG |
193 | goto error; |
194 | } | |
195 | ||
ecc48a90 | 196 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 197 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
198 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
199 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 200 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 201 | |
54012638 | 202 | /* Kernel tracer channel creation */ |
f3ed775e | 203 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 204 | if (ret < 0) { |
df0f840b | 205 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
206 | goto error; |
207 | } | |
208 | ||
54012638 | 209 | /* Setup the channel fd */ |
20fe2104 | 210 | lkc->fd = ret; |
7b395890 DG |
211 | /* Prevent fd duplication after execlp() */ |
212 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
213 | if (ret < 0) { | |
df0f840b | 214 | PERROR("fcntl session fd"); |
7b395890 DG |
215 | } |
216 | ||
54012638 | 217 | /* Add channel to session */ |
8c0faa1d DG |
218 | cds_list_add(&lkc->list, &session->channel_list.head); |
219 | session->channel_count++; | |
fb5f35b6 | 220 | lkc->session = session; |
e1f3997a | 221 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 222 | |
e1f3997a JD |
223 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
224 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
225 | |
226 | return 0; | |
227 | ||
228 | error: | |
5f62c685 DG |
229 | if (lkc) { |
230 | free(lkc->channel); | |
231 | free(lkc); | |
232 | } | |
54012638 | 233 | return -1; |
20fe2104 | 234 | } |
f34daff7 | 235 | |
2463b787 JR |
236 | /* |
237 | * Create a kernel channel, register it to the kernel tracer and add it to the | |
238 | * kernel session. | |
239 | */ | |
240 | static | |
241 | int kernel_create_trigger_group(int *trigger_group_fd) | |
242 | { | |
243 | int ret; | |
244 | int local_fd = -1; | |
245 | ||
246 | assert(trigger_group_fd); | |
247 | ||
248 | /* Kernel tracer channel creation */ | |
249 | ret = kernctl_create_trigger_group(kernel_tracer_fd); | |
250 | if (ret < 0) { | |
251 | PERROR("ioctl kernel create trigger group"); | |
252 | ret = -1; | |
253 | goto error; | |
254 | } | |
255 | ||
256 | /* Store locally */ | |
257 | local_fd = ret; | |
258 | ||
259 | /* Prevent fd duplication after execlp() */ | |
260 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
261 | if (ret < 0) { | |
262 | PERROR("fcntl session fd"); | |
263 | } | |
264 | ||
265 | DBG("Kernel trigger group created (fd: %d)", | |
266 | local_fd); | |
267 | ret = 0; | |
268 | ||
269 | error: | |
270 | *trigger_group_fd = local_fd; | |
271 | return ret; | |
272 | } | |
273 | ||
410b78a0 FD |
274 | /* |
275 | * Compute the offset of the instrumentation byte in the binary based on the | |
276 | * function probe location using the ELF lookup method. | |
277 | * | |
278 | * Returns 0 on success and set the offset out parameter to the offset of the | |
279 | * elf symbol | |
280 | * Returns -1 on error | |
281 | */ | |
282 | static | |
283 | int extract_userspace_probe_offset_function_elf( | |
87597c2c | 284 | const struct lttng_userspace_probe_location *probe_location, |
2463b787 | 285 | uid_t uid, gid_t gid, uint64_t *offset) |
410b78a0 FD |
286 | { |
287 | int fd; | |
288 | int ret = 0; | |
289 | const char *symbol = NULL; | |
87597c2c | 290 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
291 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
292 | ||
410b78a0 FD |
293 | assert(lttng_userspace_probe_location_get_type(probe_location) == |
294 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); | |
295 | ||
296 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
297 | probe_location); | |
298 | if (!lookup) { | |
299 | ret = -1; | |
300 | goto end; | |
301 | } | |
302 | ||
303 | lookup_method_type = | |
304 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
305 | ||
306 | assert(lookup_method_type == | |
307 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); | |
308 | ||
309 | symbol = lttng_userspace_probe_location_function_get_function_name( | |
310 | probe_location); | |
311 | if (!symbol) { | |
312 | ret = -1; | |
313 | goto end; | |
314 | } | |
315 | ||
316 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
317 | if (fd < 0) { | |
318 | ret = -1; | |
319 | goto end; | |
320 | } | |
321 | ||
2463b787 | 322 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
323 | if (ret < 0) { |
324 | DBG("userspace probe offset calculation failed for " | |
325 | "function %s", symbol); | |
326 | goto end; | |
327 | } | |
328 | ||
329 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t)(*offset)); | |
330 | end: | |
331 | return ret; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
336 | * tracepoint probe location using the SDT lookup method. This function | |
337 | * allocates the offsets buffer, the caller must free it. | |
338 | * | |
339 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
340 | * SDT tracepoint. | |
341 | * Returns -1 on error. | |
342 | */ | |
343 | static | |
344 | int extract_userspace_probe_offset_tracepoint_sdt( | |
87597c2c | 345 | const struct lttng_userspace_probe_location *probe_location, |
2463b787 | 346 | uid_t uid, gid_t gid, uint64_t **offsets, |
410b78a0 FD |
347 | uint32_t *offsets_count) |
348 | { | |
349 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
87597c2c | 350 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
351 | const char *probe_name = NULL, *provider_name = NULL; |
352 | int ret = 0; | |
353 | int fd, i; | |
354 | ||
355 | assert(lttng_userspace_probe_location_get_type(probe_location) == | |
356 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); | |
357 | ||
358 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
359 | if (!lookup) { | |
360 | ret = -1; | |
361 | goto end; | |
362 | } | |
363 | ||
364 | lookup_method_type = | |
365 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
366 | ||
367 | assert(lookup_method_type == | |
368 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); | |
369 | ||
370 | ||
371 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name( | |
372 | probe_location); | |
373 | if (!probe_name) { | |
374 | ret = -1; | |
375 | goto end; | |
376 | } | |
377 | ||
378 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name( | |
379 | probe_location); | |
380 | if (!provider_name) { | |
381 | ret = -1; | |
382 | goto end; | |
383 | } | |
384 | ||
385 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
386 | if (fd < 0) { | |
387 | ret = -1; | |
388 | goto end; | |
389 | } | |
390 | ||
391 | ret = run_as_extract_sdt_probe_offsets(fd, provider_name, probe_name, | |
2463b787 | 392 | uid, gid, offsets, offsets_count); |
410b78a0 FD |
393 | if (ret < 0) { |
394 | DBG("userspace probe offset calculation failed for sdt " | |
395 | "probe %s:%s", provider_name, probe_name); | |
396 | goto end; | |
397 | } | |
398 | ||
399 | if (*offsets_count == 0) { | |
400 | DBG("no userspace probe offset found"); | |
401 | goto end; | |
402 | } | |
403 | ||
404 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
405 | *offsets_count, provider_name, probe_name); | |
406 | for (i = 0; i < *offsets_count; i++) { | |
407 | DBG("\t0x%jd", (intmax_t)((*offsets)[i])); | |
408 | } | |
409 | end: | |
410 | return ret; | |
411 | } | |
412 | ||
410b78a0 | 413 | static |
2463b787 JR |
414 | int userspace_probe_add_callsite( |
415 | const struct lttng_userspace_probe_location *location, | |
416 | uid_t uid, gid_t gid, int fd) | |
410b78a0 | 417 | { |
87597c2c | 418 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
410b78a0 | 419 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
420 | int ret; |
421 | ||
2463b787 | 422 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
423 | if (!lookup_method) { |
424 | ret = -1; | |
425 | goto end; | |
426 | } | |
427 | ||
428 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
429 | switch (type) { | |
430 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
431 | { | |
432 | struct lttng_kernel_event_callsite callsite; | |
433 | uint64_t offset; | |
434 | ||
2463b787 JR |
435 | ret = extract_userspace_probe_offset_function_elf(location, |
436 | uid, gid, &offset); | |
410b78a0 FD |
437 | if (ret) { |
438 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
439 | goto end; | |
440 | } | |
441 | ||
442 | callsite.u.uprobe.offset = offset; | |
443 | ret = kernctl_add_callsite(fd, &callsite); | |
444 | if (ret) { | |
2463b787 | 445 | WARN("Adding callsite to ELF userspace probe failed."); |
410b78a0 FD |
446 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
447 | goto end; | |
448 | } | |
449 | break; | |
450 | } | |
451 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
452 | { | |
453 | int i; | |
454 | uint64_t *offsets = NULL; | |
455 | uint32_t offsets_count; | |
456 | struct lttng_kernel_event_callsite callsite; | |
457 | ||
458 | /* | |
459 | * This call allocates the offsets buffer. This buffer must be freed | |
460 | * by the caller | |
461 | */ | |
2463b787 JR |
462 | ret = extract_userspace_probe_offset_tracepoint_sdt(location, |
463 | uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
464 | if (ret) { |
465 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
466 | goto end; | |
467 | } | |
468 | for (i = 0; i < offsets_count; i++) { | |
469 | callsite.u.uprobe.offset = offsets[i]; | |
470 | ret = kernctl_add_callsite(fd, &callsite); | |
471 | if (ret) { | |
2463b787 JR |
472 | WARN("Adding callsite to SDT userspace probe " |
473 | "failed."); | |
410b78a0 FD |
474 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
475 | free(offsets); | |
476 | goto end; | |
477 | } | |
478 | } | |
479 | free(offsets); | |
480 | break; | |
481 | } | |
482 | default: | |
483 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
484 | goto end; | |
485 | } | |
486 | end: | |
487 | return ret; | |
488 | } | |
489 | ||
2463b787 JR |
490 | /* |
491 | * Extract the offsets of the instrumentation point for the different lookup | |
492 | * methods. | |
493 | */ | |
494 | static | |
495 | int userspace_probe_event_add_callsites(struct lttng_event *ev, | |
496 | struct ltt_kernel_session *session, int fd) | |
497 | { | |
498 | const struct lttng_userspace_probe_location *location = NULL; | |
499 | int ret; | |
500 | ||
501 | assert(ev); | |
502 | assert(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
503 | ||
504 | location = lttng_event_get_userspace_probe_location(ev); | |
505 | if (!location) { | |
506 | ret = -1; | |
507 | goto end; | |
508 | } | |
509 | ||
510 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, | |
511 | fd); | |
512 | if (ret) { | |
513 | WARN("Adding callsite to userspace probe event \"%s\" " | |
514 | "failed.", ev->name); | |
515 | } | |
516 | ||
517 | end: | |
518 | return ret; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Extract the offsets of the instrumentation point for the different lookup | |
523 | * methods. | |
524 | */ | |
525 | static int userspace_probe_event_rule_add_callsites( | |
526 | const struct lttng_event_rule *rule, | |
527 | const struct lttng_credentials *creds, | |
528 | int fd) | |
529 | { | |
530 | const struct lttng_userspace_probe_location *location = NULL; | |
531 | enum lttng_event_rule_status status; | |
532 | int ret; | |
533 | ||
534 | assert(rule); | |
535 | assert(creds); | |
536 | assert(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_UPROBE); | |
537 | ||
538 | status = lttng_event_rule_uprobe_get_location(rule, &location); | |
539 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { | |
540 | ret = -1; | |
541 | goto end; | |
542 | } | |
543 | ||
544 | ret = userspace_probe_add_callsite( | |
545 | location, lttng_credentials_get_uid(creds), lttng_credentials_get_gid(creds), fd); | |
546 | if (ret) { | |
547 | WARN("Adding callsite to userspace probe object %d" | |
548 | "failed.", fd); | |
549 | } | |
550 | ||
551 | end: | |
552 | return ret; | |
553 | } | |
554 | ||
f34daff7 | 555 | /* |
050349bb DG |
556 | * Create a kernel event, enable it to the kernel tracer and add it to the |
557 | * channel event list of the kernel session. | |
49d21f93 | 558 | * We own filter_expression and filter. |
f34daff7 | 559 | */ |
050349bb | 560 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
561 | struct ltt_kernel_channel *channel, |
562 | char *filter_expression, | |
2463b787 | 563 | struct lttng_bytecode *filter) |
f34daff7 | 564 | { |
71a3bb01 FD |
565 | int err, fd; |
566 | enum lttng_error_code ret; | |
f34daff7 | 567 | struct ltt_kernel_event *event; |
f34daff7 | 568 | |
0525e9ae DG |
569 | assert(ev); |
570 | assert(channel); | |
571 | ||
a969e101 | 572 | /* We pass ownership of filter_expression and filter */ |
71a3bb01 FD |
573 | ret = trace_kernel_create_event(ev, filter_expression, |
574 | filter, &event); | |
575 | if (ret != LTTNG_OK) { | |
f34daff7 DG |
576 | goto error; |
577 | } | |
578 | ||
71a3bb01 FD |
579 | fd = kernctl_create_event(channel->fd, event->event); |
580 | if (fd < 0) { | |
581 | switch (-fd) { | |
bd29c13d | 582 | case EEXIST: |
71a3bb01 | 583 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
584 | break; |
585 | case ENOSYS: | |
586 | WARN("Event type not implemented"); | |
71a3bb01 | 587 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 588 | break; |
8197a339 DG |
589 | case ENOENT: |
590 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 591 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 592 | break; |
bd29c13d | 593 | default: |
71a3bb01 | 594 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
595 | PERROR("create event ioctl"); |
596 | } | |
e953ef25 | 597 | goto free_event; |
8c0faa1d | 598 | } |
f34daff7 | 599 | |
d0ae4ea8 | 600 | event->type = ev->type; |
71a3bb01 | 601 | event->fd = fd; |
7b395890 | 602 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
603 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
604 | if (err < 0) { | |
df0f840b | 605 | PERROR("fcntl session fd"); |
7b395890 DG |
606 | } |
607 | ||
00a62084 | 608 | if (filter) { |
71a3bb01 FD |
609 | err = kernctl_filter(event->fd, filter); |
610 | if (err < 0) { | |
611 | switch (-err) { | |
612 | case ENOMEM: | |
613 | ret = LTTNG_ERR_FILTER_NOMEM; | |
614 | break; | |
615 | default: | |
616 | ret = LTTNG_ERR_FILTER_INVAL; | |
617 | break; | |
618 | } | |
00a62084 MD |
619 | goto filter_error; |
620 | } | |
621 | } | |
622 | ||
dcabc190 | 623 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
2463b787 JR |
624 | ret = userspace_probe_event_add_callsites(ev, channel->session, |
625 | event->fd); | |
dcabc190 FD |
626 | if (ret) { |
627 | goto add_callsite_error; | |
628 | } | |
629 | } | |
630 | ||
71a3bb01 FD |
631 | err = kernctl_enable(event->fd); |
632 | if (err < 0) { | |
633 | switch (-err) { | |
00a62084 MD |
634 | case EEXIST: |
635 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
636 | break; | |
637 | default: | |
638 | PERROR("enable kernel event"); | |
71a3bb01 | 639 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
640 | break; |
641 | } | |
642 | goto enable_error; | |
643 | } | |
644 | ||
f3ed775e DG |
645 | /* Add event to event list */ |
646 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
647 | channel->event_count++; |
648 | ||
e953ef25 DG |
649 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
650 | ||
651 | return 0; | |
652 | ||
dcabc190 | 653 | add_callsite_error: |
00a62084 MD |
654 | enable_error: |
655 | filter_error: | |
656 | { | |
657 | int closeret; | |
658 | ||
659 | closeret = close(event->fd); | |
660 | if (closeret) { | |
661 | PERROR("close event fd"); | |
662 | } | |
663 | } | |
e953ef25 DG |
664 | free_event: |
665 | free(event); | |
666 | error: | |
d87bfb32 | 667 | return ret; |
e953ef25 DG |
668 | } |
669 | ||
26cc6b4e | 670 | /* |
050349bb | 671 | * Disable a kernel channel. |
26cc6b4e DG |
672 | */ |
673 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
674 | { | |
675 | int ret; | |
676 | ||
0525e9ae DG |
677 | assert(chan); |
678 | ||
26cc6b4e DG |
679 | ret = kernctl_disable(chan->fd); |
680 | if (ret < 0) { | |
df0f840b | 681 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
682 | goto error; |
683 | } | |
684 | ||
685 | chan->enabled = 0; | |
e1f3997a JD |
686 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
687 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
688 | |
689 | return 0; | |
690 | ||
691 | error: | |
692 | return ret; | |
693 | } | |
694 | ||
d36b8583 | 695 | /* |
050349bb | 696 | * Enable a kernel channel. |
d36b8583 DG |
697 | */ |
698 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
699 | { | |
700 | int ret; | |
701 | ||
0525e9ae DG |
702 | assert(chan); |
703 | ||
d36b8583 | 704 | ret = kernctl_enable(chan->fd); |
32af2c95 | 705 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 706 | PERROR("Enable kernel chan"); |
d36b8583 DG |
707 | goto error; |
708 | } | |
709 | ||
710 | chan->enabled = 1; | |
e1f3997a JD |
711 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
712 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
713 | |
714 | return 0; | |
715 | ||
716 | error: | |
717 | return ret; | |
718 | } | |
719 | ||
19e70852 | 720 | /* |
050349bb | 721 | * Enable a kernel event. |
19e70852 DG |
722 | */ |
723 | int kernel_enable_event(struct ltt_kernel_event *event) | |
724 | { | |
725 | int ret; | |
726 | ||
0525e9ae DG |
727 | assert(event); |
728 | ||
19e70852 | 729 | ret = kernctl_enable(event->fd); |
42224349 | 730 | if (ret < 0) { |
32af2c95 | 731 | switch (-ret) { |
42224349 | 732 | case EEXIST: |
f73fabfd | 733 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
734 | break; |
735 | default: | |
736 | PERROR("enable kernel event"); | |
737 | break; | |
738 | } | |
19e70852 DG |
739 | goto error; |
740 | } | |
741 | ||
742 | event->enabled = 1; | |
743 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
744 | ||
745 | return 0; | |
746 | ||
747 | error: | |
d36b8583 | 748 | return ret; |
19e70852 DG |
749 | } |
750 | ||
e953ef25 | 751 | /* |
050349bb | 752 | * Disable a kernel event. |
e953ef25 | 753 | */ |
19e70852 | 754 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
755 | { |
756 | int ret; | |
19e70852 | 757 | |
0525e9ae DG |
758 | assert(event); |
759 | ||
19e70852 | 760 | ret = kernctl_disable(event->fd); |
42224349 | 761 | if (ret < 0) { |
32af2c95 | 762 | switch (-ret) { |
42224349 | 763 | case EEXIST: |
f73fabfd | 764 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
765 | break; |
766 | default: | |
767 | PERROR("disable kernel event"); | |
768 | break; | |
769 | } | |
19e70852 | 770 | goto error; |
e953ef25 | 771 | } |
f3ed775e | 772 | |
19e70852 DG |
773 | event->enabled = 0; |
774 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
775 | ||
f34daff7 DG |
776 | return 0; |
777 | ||
778 | error: | |
d36b8583 | 779 | return ret; |
f34daff7 | 780 | } |
aaf26714 | 781 | |
2463b787 JR |
782 | /* |
783 | * Disable a kernel trigger. | |
784 | */ | |
785 | static | |
786 | int kernel_disable_token_event_rule(struct ltt_kernel_token_event_rule *event) | |
787 | { | |
788 | int ret; | |
789 | ||
790 | assert(event); | |
791 | ||
792 | rcu_read_lock(); | |
793 | cds_lfht_del(kernel_tracer_token_ht, &event->ht_node); | |
794 | rcu_read_unlock(); | |
795 | ||
796 | ret = kernctl_disable(event->fd); | |
797 | if (ret < 0) { | |
798 | switch (-ret) { | |
799 | case EEXIST: | |
800 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
801 | break; | |
802 | default: | |
803 | PERROR("disable kernel event"); | |
804 | break; | |
805 | } | |
806 | goto error; | |
807 | } | |
808 | ||
809 | event->enabled = 0; | |
810 | DBG("Kernel trigger token %" PRIu64" disabled (fd: %d)", event->token, event->fd); | |
811 | ||
812 | return 0; | |
813 | ||
814 | error: | |
815 | return ret; | |
816 | } | |
817 | ||
159b042f JG |
818 | static |
819 | struct process_attr_tracker *_kernel_get_process_attr_tracker( | |
55c9e7ca | 820 | struct ltt_kernel_session *session, |
159b042f | 821 | enum lttng_process_attr process_attr) |
55c9e7ca | 822 | { |
159b042f JG |
823 | switch (process_attr) { |
824 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
825 | return session->tracker_pid; | |
826 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
827 | return session->tracker_vpid; | |
828 | case LTTNG_PROCESS_ATTR_USER_ID: | |
829 | return session->tracker_uid; | |
830 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
831 | return session->tracker_vuid; | |
832 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
833 | return session->tracker_gid; | |
834 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
835 | return session->tracker_vgid; | |
55c9e7ca JR |
836 | default: |
837 | return NULL; | |
838 | } | |
839 | } | |
6e911cad | 840 | |
159b042f | 841 | const struct process_attr_tracker *kernel_get_process_attr_tracker( |
55c9e7ca | 842 | struct ltt_kernel_session *session, |
159b042f | 843 | enum lttng_process_attr process_attr) |
ccf10263 | 844 | { |
159b042f JG |
845 | return (const struct process_attr_tracker *) |
846 | _kernel_get_process_attr_tracker(session, process_attr); | |
847 | } | |
7c493d31 | 848 | |
159b042f JG |
849 | enum lttng_error_code kernel_process_attr_tracker_set_tracking_policy( |
850 | struct ltt_kernel_session *session, | |
851 | enum lttng_process_attr process_attr, | |
852 | enum lttng_tracking_policy policy) | |
853 | { | |
854 | int ret; | |
855 | enum lttng_error_code ret_code = LTTNG_OK; | |
856 | struct process_attr_tracker *tracker = | |
857 | _kernel_get_process_attr_tracker(session, process_attr); | |
858 | enum lttng_tracking_policy previous_policy; | |
55c9e7ca | 859 | |
159b042f JG |
860 | if (!tracker) { |
861 | ret_code = LTTNG_ERR_INVALID; | |
862 | goto end; | |
7c493d31 | 863 | } |
ccf10263 | 864 | |
159b042f JG |
865 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
866 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
867 | if (ret) { | |
868 | ret_code = LTTNG_ERR_UNK; | |
869 | goto end; | |
55c9e7ca | 870 | } |
7c493d31 | 871 | |
159b042f | 872 | if (previous_policy == policy) { |
55c9e7ca | 873 | goto end; |
7c493d31 | 874 | } |
55c9e7ca | 875 | |
159b042f JG |
876 | switch (policy) { |
877 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
878 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
879 | /* | |
880 | * Maintain a special case for the process ID process | |
881 | * attribute tracker as it was the only supported | |
882 | * attribute prior to 2.12. | |
883 | */ | |
884 | ret = kernctl_track_pid(session->fd, -1); | |
885 | } else { | |
886 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
887 | } |
888 | break; | |
159b042f JG |
889 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
890 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
891 | /* fall-through. */ | |
892 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
893 | /* | |
894 | * Maintain a special case for the process ID process | |
895 | * attribute tracker as it was the only supported | |
896 | * attribute prior to 2.12. | |
897 | */ | |
898 | ret = kernctl_untrack_pid(session->fd, -1); | |
899 | } else { | |
900 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
901 | } |
902 | break; | |
903 | default: | |
159b042f | 904 | abort(); |
55c9e7ca | 905 | } |
159b042f | 906 | /* kern-ctl error handling */ |
32af2c95 | 907 | switch (-ret) { |
159b042f JG |
908 | case 0: |
909 | ret_code = LTTNG_OK; | |
910 | break; | |
7c493d31 | 911 | case EINVAL: |
159b042f | 912 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 913 | break; |
7c493d31 | 914 | case ENOMEM: |
159b042f | 915 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
916 | break; |
917 | case EEXIST: | |
159b042f | 918 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 919 | break; |
7c493d31 | 920 | default: |
159b042f | 921 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
922 | break; |
923 | } | |
55c9e7ca | 924 | end: |
159b042f | 925 | return ret_code; |
ccf10263 MD |
926 | } |
927 | ||
159b042f | 928 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_add_value( |
55c9e7ca | 929 | struct ltt_kernel_session *session, |
159b042f JG |
930 | enum lttng_process_attr process_attr, |
931 | const struct process_attr_value *value) | |
a5dfbb9d | 932 | { |
159b042f JG |
933 | int ret, integral_value; |
934 | enum lttng_error_code ret_code; | |
935 | struct process_attr_tracker *tracker; | |
936 | enum process_attr_tracker_status status; | |
a5dfbb9d | 937 | |
159b042f JG |
938 | /* |
939 | * Convert process attribute tracker value to the integral | |
940 | * representation required by the kern-ctl API. | |
941 | */ | |
942 | switch (process_attr) { | |
943 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
944 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
945 | integral_value = (int) value->value.pid; | |
55c9e7ca | 946 | break; |
159b042f JG |
947 | case LTTNG_PROCESS_ATTR_USER_ID: |
948 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
949 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
950 | uid_t uid; | |
951 | ||
952 | ret_code = utils_user_id_from_name( | |
953 | value->value.user_name, &uid); | |
954 | if (ret_code != LTTNG_OK) { | |
955 | goto end; | |
956 | } | |
957 | integral_value = (int) uid; | |
958 | } else { | |
959 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
960 | } |
961 | break; | |
159b042f JG |
962 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
963 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
964 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
965 | gid_t gid; | |
966 | ||
967 | ret_code = utils_group_id_from_name( | |
968 | value->value.group_name, &gid); | |
969 | if (ret_code != LTTNG_OK) { | |
970 | goto end; | |
971 | } | |
972 | integral_value = (int) gid; | |
973 | } else { | |
974 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 975 | } |
55c9e7ca JR |
976 | break; |
977 | default: | |
159b042f JG |
978 | ret_code = LTTNG_ERR_INVALID; |
979 | goto end; | |
55c9e7ca JR |
980 | } |
981 | ||
159b042f JG |
982 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
983 | if (!tracker) { | |
984 | ret_code = LTTNG_ERR_INVALID; | |
985 | goto end; | |
986 | } | |
987 | ||
988 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
989 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
990 | switch (status) { | |
991 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
992 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
993 | break; | |
994 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
995 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
996 | break; | |
997 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
998 | default: | |
999 | ret_code = LTTNG_ERR_UNK; | |
1000 | break; | |
1001 | } | |
1002 | goto end; | |
1003 | } | |
1004 | ||
1005 | DBG("Kernel track %s %d for session id %" PRIu64, | |
1006 | lttng_process_attr_to_string(process_attr), | |
1007 | integral_value, session->id); | |
1008 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1009 | /* | |
1010 | * Maintain a special case for the process ID process attribute | |
1011 | * tracker as it was the only supported attribute prior to 2.12. | |
1012 | */ | |
1013 | ret = kernctl_track_pid(session->fd, integral_value); | |
1014 | } else { | |
1015 | ret = kernctl_track_id( | |
1016 | session->fd, process_attr, integral_value); | |
1017 | } | |
1018 | if (ret == 0) { | |
1019 | ret_code = LTTNG_OK; | |
1020 | goto end; | |
1021 | } | |
1022 | ||
1023 | kernel_wait_quiescent(); | |
1024 | ||
1025 | /* kern-ctl error handling */ | |
55c9e7ca | 1026 | switch (-ret) { |
159b042f JG |
1027 | case 0: |
1028 | ret_code = LTTNG_OK; | |
1029 | break; | |
55c9e7ca | 1030 | case EINVAL: |
159b042f | 1031 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1032 | break; |
1033 | case ENOMEM: | |
159b042f | 1034 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1035 | break; |
1036 | case EEXIST: | |
159b042f | 1037 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1038 | break; |
1039 | default: | |
159b042f | 1040 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1041 | break; |
a5dfbb9d MD |
1042 | } |
1043 | ||
159b042f JG |
1044 | /* Attempt to remove the value from the tracker. */ |
1045 | status = process_attr_tracker_inclusion_set_remove_value( | |
1046 | tracker, value); | |
1047 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1048 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1049 | lttng_process_attr_to_string(process_attr), | |
1050 | integral_value); | |
55c9e7ca | 1051 | } |
a5dfbb9d | 1052 | end: |
159b042f | 1053 | return ret_code; |
55c9e7ca | 1054 | } |
a5dfbb9d | 1055 | |
159b042f | 1056 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_remove_value( |
55c9e7ca | 1057 | struct ltt_kernel_session *session, |
159b042f JG |
1058 | enum lttng_process_attr process_attr, |
1059 | const struct process_attr_value *value) | |
55c9e7ca | 1060 | { |
159b042f JG |
1061 | int ret, integral_value; |
1062 | enum lttng_error_code ret_code; | |
1063 | struct process_attr_tracker *tracker; | |
1064 | enum process_attr_tracker_status status; | |
1065 | ||
1066 | /* | |
1067 | * Convert process attribute tracker value to the integral | |
1068 | * representation required by the kern-ctl API. | |
1069 | */ | |
1070 | switch (process_attr) { | |
1071 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1072 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1073 | integral_value = (int) value->value.pid; | |
1074 | break; | |
1075 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1076 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1077 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1078 | uid_t uid; | |
1079 | ||
1080 | ret_code = utils_user_id_from_name( | |
1081 | value->value.user_name, &uid); | |
1082 | if (ret_code != LTTNG_OK) { | |
1083 | goto end; | |
1084 | } | |
1085 | integral_value = (int) uid; | |
1086 | } else { | |
1087 | integral_value = (int) value->value.uid; | |
1088 | } | |
1089 | break; | |
1090 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1091 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1092 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1093 | gid_t gid; | |
1094 | ||
1095 | ret_code = utils_group_id_from_name( | |
1096 | value->value.group_name, &gid); | |
1097 | if (ret_code != LTTNG_OK) { | |
1098 | goto end; | |
1099 | } | |
1100 | integral_value = (int) gid; | |
1101 | } else { | |
1102 | integral_value = (int) value->value.gid; | |
1103 | } | |
1104 | break; | |
1105 | default: | |
1106 | ret_code = LTTNG_ERR_INVALID; | |
1107 | goto end; | |
1108 | } | |
55c9e7ca | 1109 | |
159b042f JG |
1110 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1111 | if (!tracker) { | |
1112 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1113 | goto end; |
a5dfbb9d | 1114 | } |
a7a533cd | 1115 | |
159b042f JG |
1116 | status = process_attr_tracker_inclusion_set_remove_value( |
1117 | tracker, value); | |
1118 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1119 | switch (status) { | |
1120 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1121 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1122 | break; | |
1123 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1124 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1125 | break; | |
1126 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1127 | default: | |
1128 | ret_code = LTTNG_ERR_UNK; | |
1129 | break; | |
1130 | } | |
a7a533cd JR |
1131 | goto end; |
1132 | } | |
1133 | ||
159b042f JG |
1134 | DBG("Kernel track %s %d for session id %" PRIu64, |
1135 | lttng_process_attr_to_string(process_attr), | |
1136 | integral_value, session->id); | |
1137 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1138 | /* | |
1139 | * Maintain a special case for the process ID process attribute | |
1140 | * tracker as it was the only supported attribute prior to 2.12. | |
1141 | */ | |
1142 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1143 | } else { | |
1144 | ret = kernctl_untrack_id( | |
1145 | session->fd, process_attr, integral_value); | |
1146 | } | |
1147 | if (ret == 0) { | |
1148 | ret_code = LTTNG_OK; | |
1149 | goto end; | |
1150 | } | |
1151 | kernel_wait_quiescent(); | |
1152 | ||
1153 | /* kern-ctl error handling */ | |
1154 | switch (-ret) { | |
1155 | case 0: | |
1156 | ret_code = LTTNG_OK; | |
1157 | break; | |
1158 | case EINVAL: | |
1159 | ret_code = LTTNG_ERR_INVALID; | |
1160 | break; | |
1161 | case ENOMEM: | |
1162 | ret_code = LTTNG_ERR_NOMEM; | |
1163 | break; | |
1164 | case ENOENT: | |
1165 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1166 | break; | |
1167 | default: | |
1168 | ret_code = LTTNG_ERR_UNK; | |
1169 | break; | |
1170 | } | |
1171 | ||
1172 | /* Attempt to add the value to the tracker. */ | |
1173 | status = process_attr_tracker_inclusion_set_add_value( | |
1174 | tracker, value); | |
1175 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1176 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1177 | lttng_process_attr_to_string(process_attr), | |
1178 | integral_value); | |
1179 | } | |
a7a533cd | 1180 | end: |
159b042f | 1181 | return ret_code; |
a5dfbb9d MD |
1182 | } |
1183 | ||
aaf26714 | 1184 | /* |
050349bb DG |
1185 | * Create kernel metadata, open from the kernel tracer and add it to the |
1186 | * kernel session. | |
aaf26714 | 1187 | */ |
a4b92340 | 1188 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1189 | { |
1190 | int ret; | |
74024a21 | 1191 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 1192 | |
0525e9ae DG |
1193 | assert(session); |
1194 | ||
54012638 | 1195 | /* Allocate kernel metadata */ |
a4b92340 | 1196 | lkm = trace_kernel_create_metadata(); |
54012638 | 1197 | if (lkm == NULL) { |
aaf26714 DG |
1198 | goto error; |
1199 | } | |
1200 | ||
54012638 | 1201 | /* Kernel tracer metadata creation */ |
f3ed775e | 1202 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1203 | if (ret < 0) { |
74024a21 | 1204 | goto error_open; |
aaf26714 DG |
1205 | } |
1206 | ||
8c0faa1d | 1207 | lkm->fd = ret; |
d40f0359 | 1208 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1209 | /* Prevent fd duplication after execlp() */ |
1210 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1211 | if (ret < 0) { | |
df0f840b | 1212 | PERROR("fcntl session fd"); |
7b395890 DG |
1213 | } |
1214 | ||
aaf26714 | 1215 | session->metadata = lkm; |
8c0faa1d | 1216 | |
00e2e675 | 1217 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1218 | |
1219 | return 0; | |
1220 | ||
74024a21 DG |
1221 | error_open: |
1222 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1223 | error: |
54012638 | 1224 | return -1; |
8c0faa1d DG |
1225 | } |
1226 | ||
1227 | /* | |
050349bb | 1228 | * Start tracing session. |
8c0faa1d DG |
1229 | */ |
1230 | int kernel_start_session(struct ltt_kernel_session *session) | |
1231 | { | |
1232 | int ret; | |
1233 | ||
0525e9ae DG |
1234 | assert(session); |
1235 | ||
8c0faa1d DG |
1236 | ret = kernctl_start_session(session->fd); |
1237 | if (ret < 0) { | |
df0f840b | 1238 | PERROR("ioctl start session"); |
8c0faa1d DG |
1239 | goto error; |
1240 | } | |
1241 | ||
1242 | DBG("Kernel session started"); | |
1243 | ||
1244 | return 0; | |
1245 | ||
1246 | error: | |
1247 | return ret; | |
1248 | } | |
1249 | ||
f3ed775e | 1250 | /* |
050349bb | 1251 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1252 | */ |
7d268848 | 1253 | void kernel_wait_quiescent(void) |
f3ed775e DG |
1254 | { |
1255 | int ret; | |
7d268848 | 1256 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1257 | |
1258 | DBG("Kernel quiescent wait on %d", fd); | |
1259 | ||
1260 | ret = kernctl_wait_quiescent(fd); | |
1261 | if (ret < 0) { | |
df0f840b | 1262 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1263 | ERR("Kernel quiescent wait failed"); |
1264 | } | |
1265 | } | |
1266 | ||
1267 | /* | |
f3ed775e DG |
1268 | * Force flush buffer of metadata. |
1269 | */ | |
1270 | int kernel_metadata_flush_buffer(int fd) | |
1271 | { | |
1272 | int ret; | |
1273 | ||
169d2cb7 DG |
1274 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1275 | ||
f3ed775e DG |
1276 | ret = kernctl_buffer_flush(fd); |
1277 | if (ret < 0) { | |
00e2e675 | 1278 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1279 | } |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | /* | |
050349bb | 1285 | * Force flush buffer for channel. |
f3ed775e DG |
1286 | */ |
1287 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1288 | { | |
1289 | int ret; | |
1290 | struct ltt_kernel_stream *stream; | |
1291 | ||
0525e9ae DG |
1292 | assert(channel); |
1293 | ||
f3ed775e DG |
1294 | DBG("Flush buffer for channel %s", channel->channel->name); |
1295 | ||
1296 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
1297 | DBG("Flushing channel stream %d", stream->fd); | |
1298 | ret = kernctl_buffer_flush(stream->fd); | |
1299 | if (ret < 0) { | |
df0f840b | 1300 | PERROR("ioctl"); |
f3ed775e DG |
1301 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
1302 | stream->fd, ret); | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
8c0faa1d | 1309 | /* |
050349bb | 1310 | * Stop tracing session. |
8c0faa1d DG |
1311 | */ |
1312 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1313 | { | |
1314 | int ret; | |
1315 | ||
0525e9ae DG |
1316 | assert(session); |
1317 | ||
8c0faa1d DG |
1318 | ret = kernctl_stop_session(session->fd); |
1319 | if (ret < 0) { | |
1320 | goto error; | |
1321 | } | |
1322 | ||
1323 | DBG("Kernel session stopped"); | |
1324 | ||
1325 | return 0; | |
1326 | ||
1327 | error: | |
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | /* | |
050349bb DG |
1332 | * Open stream of channel, register it to the kernel tracer and add it |
1333 | * to the stream list of the channel. | |
8c0faa1d | 1334 | * |
1cfb4b98 MD |
1335 | * Note: given that the streams may appear in random order wrt CPU |
1336 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1337 | * the stream name is not necessarily linked to the CPU number. | |
1338 | * | |
050349bb | 1339 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1340 | */ |
f3ed775e | 1341 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1342 | { |
1cfb4b98 | 1343 | int ret; |
8c0faa1d DG |
1344 | struct ltt_kernel_stream *lks; |
1345 | ||
0525e9ae DG |
1346 | assert(channel); |
1347 | ||
5a47c6a2 | 1348 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
1349 | lks = trace_kernel_create_stream(channel->channel->name, |
1350 | channel->stream_count); | |
8c0faa1d | 1351 | if (lks == NULL) { |
799e2c4f MD |
1352 | ret = close(ret); |
1353 | if (ret) { | |
1354 | PERROR("close"); | |
1355 | } | |
8c0faa1d DG |
1356 | goto error; |
1357 | } | |
1358 | ||
1359 | lks->fd = ret; | |
7b395890 DG |
1360 | /* Prevent fd duplication after execlp() */ |
1361 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1362 | if (ret < 0) { | |
df0f840b | 1363 | PERROR("fcntl session fd"); |
7b395890 DG |
1364 | } |
1365 | ||
1624d5b7 JD |
1366 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1367 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1368 | ||
1cfb4b98 | 1369 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1370 | cds_list_add(&lks->list, &channel->stream_list.head); |
1371 | channel->stream_count++; | |
8c0faa1d | 1372 | |
00e2e675 DG |
1373 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
1374 | lks->state); | |
54012638 | 1375 | } |
8c0faa1d DG |
1376 | |
1377 | return channel->stream_count; | |
1378 | ||
1379 | error: | |
54012638 | 1380 | return -1; |
8c0faa1d DG |
1381 | } |
1382 | ||
1383 | /* | |
050349bb | 1384 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1385 | */ |
f3ed775e | 1386 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1387 | { |
1388 | int ret; | |
1389 | ||
0525e9ae DG |
1390 | assert(session); |
1391 | ||
8c0faa1d DG |
1392 | ret = kernctl_create_stream(session->metadata->fd); |
1393 | if (ret < 0) { | |
df0f840b | 1394 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1395 | goto error; |
1396 | } | |
1397 | ||
1398 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1399 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1400 | /* Prevent fd duplication after execlp() */ |
1401 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1402 | if (ret < 0) { | |
df0f840b | 1403 | PERROR("fcntl session fd"); |
7b395890 | 1404 | } |
aaf26714 DG |
1405 | |
1406 | return 0; | |
1407 | ||
1408 | error: | |
54012638 | 1409 | return -1; |
aaf26714 | 1410 | } |
2ef84c95 DG |
1411 | |
1412 | /* | |
9f19cc17 | 1413 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1414 | */ |
7d268848 | 1415 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1416 | { |
53efb85a | 1417 | int fd, ret; |
9f19cc17 DG |
1418 | char *event; |
1419 | size_t nbmem, count = 0; | |
2ef84c95 | 1420 | FILE *fp; |
9f19cc17 | 1421 | struct lttng_event *elist; |
2ef84c95 | 1422 | |
0525e9ae DG |
1423 | assert(events); |
1424 | ||
7d268848 | 1425 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1426 | if (fd < 0) { |
df0f840b | 1427 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1428 | goto error; |
1429 | } | |
1430 | ||
1431 | fp = fdopen(fd, "r"); | |
1432 | if (fp == NULL) { | |
df0f840b | 1433 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1434 | goto error_fp; |
2ef84c95 DG |
1435 | } |
1436 | ||
1437 | /* | |
1438 | * Init memory size counter | |
1439 | * See kernel-ctl.h for explanation of this value | |
1440 | */ | |
6725fe19 | 1441 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 1442 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
1443 | if (elist == NULL) { |
1444 | PERROR("alloc list events"); | |
1445 | count = -ENOMEM; | |
1446 | goto end; | |
1447 | } | |
2ef84c95 | 1448 | |
53efb85a | 1449 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1450 | if (count >= nbmem) { |
3b870559 | 1451 | struct lttng_event *new_elist; |
53efb85a | 1452 | size_t new_nbmem; |
3b870559 | 1453 | |
53efb85a MD |
1454 | new_nbmem = nbmem << 1; |
1455 | DBG("Reallocating event list from %zu to %zu bytes", | |
1456 | nbmem, new_nbmem); | |
1457 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 1458 | if (new_elist == NULL) { |
df0f840b | 1459 | PERROR("realloc list events"); |
3b870559 MD |
1460 | free(event); |
1461 | free(elist); | |
61b73b12 MD |
1462 | count = -ENOMEM; |
1463 | goto end; | |
2ef84c95 | 1464 | } |
53efb85a MD |
1465 | /* Zero the new memory */ |
1466 | memset(new_elist + nbmem, 0, | |
1467 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
1468 | nbmem = new_nbmem; | |
3b870559 | 1469 | elist = new_elist; |
2ef84c95 | 1470 | } |
99497cd0 MD |
1471 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1472 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1473 | elist[count].enabled = -1; |
9f19cc17 | 1474 | count++; |
3b870559 | 1475 | free(event); |
2ef84c95 DG |
1476 | } |
1477 | ||
9f19cc17 | 1478 | *events = elist; |
ced2f820 | 1479 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1480 | end: |
799e2c4f MD |
1481 | ret = fclose(fp); /* closes both fp and fd */ |
1482 | if (ret) { | |
1483 | PERROR("fclose"); | |
1484 | } | |
9f19cc17 | 1485 | return count; |
2ef84c95 | 1486 | |
61b73b12 | 1487 | error_fp: |
799e2c4f MD |
1488 | ret = close(fd); |
1489 | if (ret) { | |
1490 | PERROR("close"); | |
1491 | } | |
2ef84c95 DG |
1492 | error: |
1493 | return -1; | |
1494 | } | |
096102bd DG |
1495 | |
1496 | /* | |
1497 | * Get kernel version and validate it. | |
1498 | */ | |
7d268848 | 1499 | int kernel_validate_version(struct lttng_kernel_tracer_version *version, |
88076e89 | 1500 | struct lttng_kernel_tracer_abi_version *abi_version) |
096102bd DG |
1501 | { |
1502 | int ret; | |
096102bd | 1503 | |
7d268848 | 1504 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1505 | if (ret < 0) { |
521dd134 | 1506 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1507 | goto error; |
1508 | } | |
1509 | ||
1510 | /* Validate version */ | |
88076e89 | 1511 | if (version->major != VERSION_MAJOR) { |
c052142c | 1512 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 1513 | version->major, VERSION_MAJOR); |
096102bd | 1514 | goto error_version; |
096102bd | 1515 | } |
7d268848 | 1516 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1517 | if (ret < 0) { |
521dd134 | 1518 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1519 | goto error; |
1520 | } | |
88076e89 | 1521 | if (abi_version->major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
521dd134 | 1522 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 1523 | abi_version->major, abi_version->minor, |
c052142c MD |
1524 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
1525 | goto error; | |
1526 | } | |
1527 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
1528 | version->major, version->minor, |
1529 | abi_version->major, abi_version->minor); | |
096102bd DG |
1530 | return 0; |
1531 | ||
1532 | error_version: | |
096102bd DG |
1533 | ret = -1; |
1534 | ||
1535 | error: | |
521dd134 | 1536 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1537 | return ret; |
1538 | } | |
335a95b7 MD |
1539 | |
1540 | /* | |
1541 | * Kernel work-arounds called at the start of sessiond main(). | |
1542 | */ | |
1543 | int init_kernel_workarounds(void) | |
1544 | { | |
8936c33a | 1545 | int ret; |
335a95b7 MD |
1546 | FILE *fp; |
1547 | ||
1548 | /* | |
1549 | * boot_id needs to be read once before being used concurrently | |
1550 | * to deal with a Linux kernel race. A fix is proposed for | |
1551 | * upstream, but the work-around is needed for older kernels. | |
1552 | */ | |
1553 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1554 | if (!fp) { | |
1555 | goto end_boot_id; | |
1556 | } | |
1557 | while (!feof(fp)) { | |
1558 | char buf[37] = ""; | |
1559 | ||
8936c33a DG |
1560 | ret = fread(buf, 1, sizeof(buf), fp); |
1561 | if (ret < 0) { | |
1562 | /* Ignore error, we don't really care */ | |
1563 | } | |
335a95b7 | 1564 | } |
799e2c4f MD |
1565 | ret = fclose(fp); |
1566 | if (ret) { | |
1567 | PERROR("fclose"); | |
1568 | } | |
335a95b7 | 1569 | end_boot_id: |
335a95b7 MD |
1570 | return 0; |
1571 | } | |
2f77fc4b DG |
1572 | |
1573 | /* | |
d070c424 | 1574 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1575 | */ |
1576 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1577 | { | |
82b69413 JG |
1578 | struct lttng_trace_chunk *trace_chunk; |
1579 | ||
2f77fc4b DG |
1580 | if (ksess == NULL) { |
1581 | DBG3("No kernel session when tearing down session"); | |
1582 | return; | |
1583 | } | |
1584 | ||
1585 | DBG("Tearing down kernel session"); | |
82b69413 | 1586 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1587 | |
07b86b52 | 1588 | /* |
15dc512a DG |
1589 | * Destroy channels on the consumer if at least one FD has been sent and we |
1590 | * are in no output mode because the streams are in *no* monitor mode so we | |
1591 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1592 | */ |
15dc512a | 1593 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1594 | int ret; |
1595 | struct consumer_socket *socket; | |
1596 | struct lttng_ht_iter iter; | |
1597 | ||
1598 | /* For each consumer socket. */ | |
d069d577 | 1599 | rcu_read_lock(); |
07b86b52 JD |
1600 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1601 | socket, node.node) { | |
1602 | struct ltt_kernel_channel *chan; | |
1603 | ||
1604 | /* For each channel, ask the consumer to destroy it. */ | |
1605 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1606 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1607 | if (ret < 0) { | |
1608 | /* Consumer is probably dead. Use next socket. */ | |
1609 | continue; | |
1610 | } | |
1611 | } | |
1612 | } | |
d069d577 | 1613 | rcu_read_unlock(); |
07b86b52 JD |
1614 | } |
1615 | ||
2f77fc4b DG |
1616 | /* Close any relayd session */ |
1617 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1618 | ||
1619 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1620 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1621 | } |
fb5f35b6 | 1622 | |
d070c424 MD |
1623 | /* Teardown of data required by destroy notifiers. */ |
1624 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1625 | { | |
1626 | if (ksess == NULL) { | |
1627 | return; | |
1628 | } | |
1629 | trace_kernel_free_session(ksess); | |
1630 | } | |
1631 | ||
fb5f35b6 DG |
1632 | /* |
1633 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1634 | */ | |
1635 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1636 | { | |
1637 | struct ltt_kernel_session *ksess = NULL; | |
1638 | ||
1639 | assert(kchan); | |
1640 | assert(kchan->channel); | |
1641 | ||
1642 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1643 | ||
1644 | /* Update channel count of associated session. */ | |
1645 | if (kchan->session) { | |
1646 | /* Keep pointer reference so we can update it after the destroy. */ | |
1647 | ksess = kchan->session; | |
1648 | } | |
1649 | ||
1650 | trace_kernel_destroy_channel(kchan); | |
1651 | ||
1652 | /* | |
1653 | * At this point the kernel channel is not visible anymore. This is safe | |
1654 | * since in order to work on a visible kernel session, the tracing session | |
1655 | * lock (ltt_session.lock) MUST be acquired. | |
1656 | */ | |
1657 | if (ksess) { | |
1658 | ksess->channel_count--; | |
1659 | } | |
1660 | } | |
6dc3064a DG |
1661 | |
1662 | /* | |
1663 | * Take a snapshot for a given kernel session. | |
1664 | * | |
9a654598 | 1665 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1666 | */ |
fb9a95c4 JG |
1667 | enum lttng_error_code kernel_snapshot_record( |
1668 | struct ltt_kernel_session *ksess, | |
348a81dc | 1669 | const struct consumer_output *output, int wait, |
d07ceecd | 1670 | uint64_t nb_packets_per_stream) |
6dc3064a | 1671 | { |
2a06df8d | 1672 | int err, ret, saved_metadata_fd; |
9a654598 | 1673 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1674 | struct consumer_socket *socket; |
1675 | struct lttng_ht_iter iter; | |
1676 | struct ltt_kernel_metadata *saved_metadata; | |
3b967712 | 1677 | char *trace_path = NULL; |
5da88b0f | 1678 | size_t consumer_path_offset = 0; |
6dc3064a DG |
1679 | |
1680 | assert(ksess); | |
1681 | assert(ksess->consumer); | |
1682 | assert(output); | |
1683 | ||
1684 | DBG("Kernel snapshot record started"); | |
1685 | ||
1686 | /* Save current metadata since the following calls will change it. */ | |
1687 | saved_metadata = ksess->metadata; | |
1688 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1689 | ||
1690 | rcu_read_lock(); | |
1691 | ||
1692 | ret = kernel_open_metadata(ksess); | |
1693 | if (ret < 0) { | |
9a654598 | 1694 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1695 | goto error; |
1696 | } | |
1697 | ||
1698 | ret = kernel_open_metadata_stream(ksess); | |
1699 | if (ret < 0) { | |
9a654598 | 1700 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1701 | goto error_open_stream; |
1702 | } | |
1703 | ||
3b967712 | 1704 | trace_path = setup_channel_trace_path(ksess->consumer, |
5da88b0f | 1705 | DEFAULT_KERNEL_TRACE_DIR, &consumer_path_offset); |
3b967712 MD |
1706 | if (!trace_path) { |
1707 | status = LTTNG_ERR_INVALID; | |
1708 | goto error; | |
1709 | } | |
6dc3064a | 1710 | /* Send metadata to consumer and snapshot everything. */ |
348a81dc | 1711 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
6dc3064a | 1712 | socket, node.node) { |
6dc3064a | 1713 | struct ltt_kernel_channel *chan; |
6dc3064a | 1714 | |
6dc3064a DG |
1715 | pthread_mutex_lock(socket->lock); |
1716 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1717 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1718 | pthread_mutex_unlock(socket->lock); |
6dc3064a | 1719 | if (ret < 0) { |
0ed78e50 | 1720 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1721 | goto error_consumer; |
1722 | } | |
1723 | ||
1724 | /* For each channel, ask the consumer to snapshot it. */ | |
1725 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
9a654598 | 1726 | status = consumer_snapshot_channel(socket, chan->key, output, 0, |
5c786ded | 1727 | ksess->uid, ksess->gid, |
5da88b0f | 1728 | &trace_path[consumer_path_offset], wait, |
d2956687 | 1729 | nb_packets_per_stream); |
9a654598 | 1730 | if (status != LTTNG_OK) { |
2a06df8d DG |
1731 | (void) kernel_consumer_destroy_metadata(socket, |
1732 | ksess->metadata); | |
6dc3064a DG |
1733 | goto error_consumer; |
1734 | } | |
1735 | } | |
1736 | ||
1737 | /* Snapshot metadata, */ | |
9a654598 | 1738 | status = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
5da88b0f MD |
1739 | 1, ksess->uid, ksess->gid, &trace_path[consumer_path_offset], |
1740 | wait, 0); | |
9a654598 | 1741 | if (status != LTTNG_OK) { |
6dc3064a DG |
1742 | goto error_consumer; |
1743 | } | |
07b86b52 JD |
1744 | |
1745 | /* | |
1746 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1747 | * it's not monitored on the consumer side. | |
1748 | */ | |
1749 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1750 | } |
1751 | ||
1752 | error_consumer: | |
1753 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1754 | err = close(ksess->metadata_stream_fd); |
1755 | if (err < 0) { | |
6dc3064a DG |
1756 | PERROR("close snapshot kernel"); |
1757 | } | |
1758 | ||
1759 | error_open_stream: | |
1760 | trace_kernel_destroy_metadata(ksess->metadata); | |
1761 | error: | |
1762 | /* Restore metadata state.*/ | |
1763 | ksess->metadata = saved_metadata; | |
1764 | ksess->metadata_stream_fd = saved_metadata_fd; | |
6dc3064a | 1765 | rcu_read_unlock(); |
3b967712 | 1766 | free(trace_path); |
9a654598 | 1767 | return status; |
6dc3064a | 1768 | } |
834978fd DG |
1769 | |
1770 | /* | |
1771 | * Get the syscall mask array from the kernel tracer. | |
1772 | * | |
1773 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1774 | * be freed. | |
1775 | */ | |
1776 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1777 | { | |
1778 | assert(syscall_mask); | |
1779 | assert(nr_bits); | |
1780 | ||
1781 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1782 | } | |
6e21424e JR |
1783 | |
1784 | /* | |
1785 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1786 | * version number. | |
1787 | * | |
1788 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1789 | * of errors. | |
1790 | */ | |
7d268848 | 1791 | int kernel_supports_ring_buffer_snapshot_sample_positions(void) |
6e21424e JR |
1792 | { |
1793 | int ret = 0; // Not supported by default | |
1794 | struct lttng_kernel_tracer_abi_version abi; | |
1795 | ||
7d268848 | 1796 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1797 | if (ret < 0) { |
1798 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1799 | goto error; | |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1804 | */ | |
1805 | if (abi.major >= 2 && abi.minor >= 3) { | |
1806 | /* Supported */ | |
1807 | ret = 1; | |
1808 | } else { | |
1809 | /* Not supported */ | |
1810 | ret = 0; | |
1811 | } | |
1812 | error: | |
1813 | return ret; | |
1814 | } | |
5c408ad8 | 1815 | |
a40a503f MD |
1816 | /* |
1817 | * Check for the support of the packet sequence number via abi version number. | |
1818 | * | |
1819 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1820 | * of errors. | |
1821 | */ | |
1822 | int kernel_supports_ring_buffer_packet_sequence_number(void) | |
1823 | { | |
1824 | int ret = 0; // Not supported by default | |
1825 | struct lttng_kernel_tracer_abi_version abi; | |
1826 | ||
1827 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); | |
1828 | if (ret < 0) { | |
1829 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1830 | goto error; | |
1831 | } | |
1832 | ||
1833 | /* | |
3029bc92 JG |
1834 | * Packet sequence number was introduced in LTTng 2.8, |
1835 | * lttng-modules ABI 2.1. | |
a40a503f | 1836 | */ |
3029bc92 | 1837 | if (abi.major >= 2 && abi.minor >= 1) { |
a40a503f MD |
1838 | /* Supported */ |
1839 | ret = 1; | |
1840 | } else { | |
1841 | /* Not supported */ | |
1842 | ret = 0; | |
1843 | } | |
1844 | error: | |
1845 | return ret; | |
1846 | } | |
1847 | ||
5c408ad8 JD |
1848 | /* |
1849 | * Rotate a kernel session. | |
1850 | * | |
d5a1b7aa | 1851 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1852 | */ |
d5a1b7aa | 1853 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1854 | { |
1855 | int ret; | |
d5a1b7aa | 1856 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1857 | struct consumer_socket *socket; |
1858 | struct lttng_ht_iter iter; | |
1859 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1860 | ||
1861 | assert(ksess); | |
1862 | assert(ksess->consumer); | |
1863 | ||
1864 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1865 | session->name, session->id); | |
1866 | ||
1867 | rcu_read_lock(); | |
1868 | ||
1869 | /* | |
1870 | * Note that this loop will end after one iteration given that there is | |
1871 | * only one kernel consumer. | |
1872 | */ | |
1873 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1874 | socket, node.node) { | |
1875 | struct ltt_kernel_channel *chan; | |
1876 | ||
b8a1b0bd | 1877 | /* For each channel, ask the consumer to rotate it. */ |
5c408ad8 | 1878 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
92816cc3 JG |
1879 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
1880 | chan->key, session->name); | |
5c408ad8 JD |
1881 | ret = consumer_rotate_channel(socket, chan->key, |
1882 | ksess->uid, ksess->gid, ksess->consumer, | |
d2956687 | 1883 | /* is_metadata_channel */ false); |
5c408ad8 | 1884 | if (ret < 0) { |
7e0de219 | 1885 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1886 | goto error; |
1887 | } | |
1888 | } | |
1889 | ||
1890 | /* | |
1891 | * Rotate the metadata channel. | |
1892 | */ | |
22a1b931 | 1893 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
5c408ad8 | 1894 | ksess->uid, ksess->gid, ksess->consumer, |
d2956687 | 1895 | /* is_metadata_channel */ true); |
5c408ad8 | 1896 | if (ret < 0) { |
7e0de219 | 1897 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1898 | goto error; |
1899 | } | |
1900 | } | |
1901 | ||
5c408ad8 JD |
1902 | error: |
1903 | rcu_read_unlock(); | |
d5a1b7aa | 1904 | return status; |
5c408ad8 | 1905 | } |
d2956687 JG |
1906 | |
1907 | enum lttng_error_code kernel_create_channel_subdirectories( | |
1908 | const struct ltt_kernel_session *ksess) | |
1909 | { | |
1910 | enum lttng_error_code ret = LTTNG_OK; | |
1911 | enum lttng_trace_chunk_status chunk_status; | |
1912 | ||
1913 | rcu_read_lock(); | |
1914 | assert(ksess->current_trace_chunk); | |
1915 | ||
1916 | /* | |
1917 | * Create the index subdirectory which will take care | |
1918 | * of implicitly creating the channel's path. | |
1919 | */ | |
1920 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
1921 | ksess->current_trace_chunk, | |
1922 | DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); | |
1923 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1924 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1925 | goto error; | |
1926 | } | |
1927 | error: | |
1928 | rcu_read_unlock(); | |
1929 | return ret; | |
1930 | } | |
7d268848 MD |
1931 | |
1932 | /* | |
1933 | * Setup necessary data for kernel tracer action. | |
1934 | */ | |
1935 | LTTNG_HIDDEN | |
1936 | int init_kernel_tracer(void) | |
1937 | { | |
1938 | int ret; | |
2463b787 | 1939 | enum lttng_error_code error_code_ret; |
7d268848 MD |
1940 | bool is_root = !getuid(); |
1941 | ||
1942 | /* Modprobe lttng kernel modules */ | |
1943 | ret = modprobe_lttng_control(); | |
1944 | if (ret < 0) { | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | /* Open debugfs lttng */ | |
1949 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1950 | if (kernel_tracer_fd < 0) { | |
1951 | DBG("Failed to open %s", module_proc_lttng); | |
1952 | goto error_open; | |
1953 | } | |
1954 | ||
1955 | /* Validate kernel version */ | |
1956 | ret = kernel_validate_version(&kernel_tracer_version, | |
1957 | &kernel_tracer_abi_version); | |
1958 | if (ret < 0) { | |
1959 | goto error_version; | |
1960 | } | |
1961 | ||
1962 | ret = modprobe_lttng_data(); | |
1963 | if (ret < 0) { | |
1964 | goto error_modules; | |
1965 | } | |
1966 | ||
1967 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1968 | if (ret < 0) { | |
1969 | goto error_modules; | |
1970 | } | |
7d268848 MD |
1971 | if (ret < 1) { |
1972 | WARN("Kernel tracer does not support buffer monitoring. " | |
1973 | "The monitoring timer of channels in the kernel domain " | |
1974 | "will be set to 0 (disabled)."); | |
1975 | } | |
1976 | ||
2463b787 JR |
1977 | ret = kernel_create_trigger_group(&kernel_tracer_trigger_group_fd); |
1978 | if (ret < 0) { | |
1979 | /* TODO: error handling if it is not supported etc. */ | |
1980 | WARN("Failed trigger group creation"); | |
1981 | kernel_tracer_trigger_group_fd = -1; | |
1982 | /* This is not fatal */ | |
1983 | } else { | |
1984 | ||
1985 | error_code_ret = kernel_create_trigger_group_notification_fd( | |
1986 | &kernel_tracer_trigger_group_notification_fd); | |
1987 | if (error_code_ret != LTTNG_OK) { | |
1988 | goto error_modules; | |
1989 | } | |
1990 | ||
1991 | trigger_error_accounting_register_kernel(kernel_tracer_trigger_group_fd); | |
1992 | if (ret < 0) { | |
1993 | goto error_modules; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | kernel_tracer_token_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
1998 | CDS_LFHT_AUTO_RESIZE|CDS_LFHT_ACCOUNTING, NULL); | |
1999 | if (!kernel_tracer_token_ht) { | |
2000 | goto error_modules; | |
2001 | } | |
2002 | ||
7d268848 | 2003 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2463b787 JR |
2004 | DBG("Kernel tracer trigger group fd %d", kernel_tracer_trigger_group_fd); |
2005 | DBG("Kernel tracer trigger group notification fd %d", kernel_tracer_trigger_group_notification_fd); | |
7d268848 MD |
2006 | |
2007 | ret = syscall_init_table(kernel_tracer_fd); | |
2008 | if (ret < 0) { | |
2009 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
2010 | "work for this session daemon."); | |
2011 | } | |
2463b787 | 2012 | |
7d268848 MD |
2013 | return 0; |
2014 | ||
2015 | error_version: | |
2016 | modprobe_remove_lttng_control(); | |
2017 | ret = close(kernel_tracer_fd); | |
2018 | if (ret) { | |
2019 | PERROR("close"); | |
2020 | } | |
2021 | kernel_tracer_fd = -1; | |
2022 | return LTTNG_ERR_KERN_VERSION; | |
2023 | ||
2024 | error_modules: | |
2025 | ret = close(kernel_tracer_fd); | |
2026 | if (ret) { | |
2027 | PERROR("close"); | |
2028 | } | |
2029 | ||
2030 | error_open: | |
2031 | modprobe_remove_lttng_control(); | |
2032 | ||
2033 | error: | |
2034 | WARN("No kernel tracer available"); | |
2035 | kernel_tracer_fd = -1; | |
2036 | if (!is_root) { | |
2037 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2038 | } else { | |
2039 | return LTTNG_ERR_KERN_NA; | |
2040 | } | |
2041 | } | |
2042 | ||
2043 | LTTNG_HIDDEN | |
2044 | void cleanup_kernel_tracer(void) | |
2045 | { | |
2046 | int ret; | |
2463b787 JR |
2047 | struct cds_lfht_iter iter; |
2048 | ||
2049 | struct ltt_kernel_token_event_rule *rule = NULL; | |
2050 | cds_lfht_for_each_entry(kernel_tracer_token_ht, &iter, rule, ht_node) { | |
2051 | kernel_disable_token_event_rule(rule); | |
2052 | trace_kernel_destroy_token_event_rule(rule); | |
2053 | cds_lfht_del(kernel_tracer_token_ht, &rule->ht_node); | |
2054 | } | |
2055 | ||
2056 | DBG2("Closing kernel trigger group notification fd"); | |
2057 | if (kernel_tracer_trigger_group_notification_fd >= 0) { | |
2058 | ||
2059 | ret = notification_thread_command_remove_application( | |
2060 | notification_thread_handle, | |
2061 | kernel_tracer_trigger_group_notification_fd); | |
2062 | if (ret != LTTNG_OK) { | |
2063 | ERR("Failed to remove kernel trigger notification from notification thread"); | |
2064 | } | |
2065 | ret = close(kernel_tracer_trigger_group_notification_fd); | |
2066 | if (ret) { | |
2067 | PERROR("close"); | |
2068 | } | |
2069 | kernel_tracer_trigger_group_notification_fd = -1; | |
2070 | } | |
2071 | ||
2072 | /* TODO: do we iterate over the list to remove all token? */ | |
2073 | DBG2("Closing kernel trigger group fd"); | |
2074 | if (kernel_tracer_trigger_group_fd >= 0) { | |
2075 | ret = close(kernel_tracer_trigger_group_fd); | |
2076 | if (ret) { | |
2077 | PERROR("close"); | |
2078 | } | |
2079 | kernel_tracer_trigger_group_fd = -1; | |
2080 | } | |
7d268848 MD |
2081 | |
2082 | DBG2("Closing kernel fd"); | |
2083 | if (kernel_tracer_fd >= 0) { | |
2084 | ret = close(kernel_tracer_fd); | |
2085 | if (ret) { | |
2086 | PERROR("close"); | |
2087 | } | |
2088 | kernel_tracer_fd = -1; | |
2089 | } | |
2463b787 | 2090 | |
7d268848 MD |
2091 | DBG("Unloading kernel modules"); |
2092 | modprobe_remove_lttng_all(); | |
2093 | free(syscall_table); | |
2094 | } | |
2095 | ||
2096 | LTTNG_HIDDEN | |
2097 | bool kernel_tracer_is_initialized(void) | |
2098 | { | |
2099 | return kernel_tracer_fd >= 0; | |
2100 | } | |
bca212a2 MD |
2101 | |
2102 | /* | |
2103 | * Clear a kernel session. | |
2104 | * | |
2105 | * Return LTTNG_OK on success or else an LTTng error code. | |
2106 | */ | |
2107 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2108 | { | |
2109 | int ret; | |
2110 | enum lttng_error_code status = LTTNG_OK; | |
2111 | struct consumer_socket *socket; | |
2112 | struct lttng_ht_iter iter; | |
2113 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2114 | ||
2115 | assert(ksess); | |
2116 | assert(ksess->consumer); | |
2117 | ||
2118 | DBG("Clear kernel session %s (session %" PRIu64 ")", | |
2119 | session->name, session->id); | |
2120 | ||
2121 | rcu_read_lock(); | |
2122 | ||
2123 | if (ksess->active) { | |
2124 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2125 | status = LTTNG_ERR_FATAL; | |
2126 | goto end; | |
2127 | } | |
2128 | ||
2129 | /* | |
2130 | * Note that this loop will end after one iteration given that there is | |
2131 | * only one kernel consumer. | |
2132 | */ | |
2133 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
2134 | socket, node.node) { | |
2135 | struct ltt_kernel_channel *chan; | |
2136 | ||
2137 | /* For each channel, ask the consumer to clear it. */ | |
2138 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
2139 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
2140 | chan->key, session->name); | |
2141 | ret = consumer_clear_channel(socket, chan->key); | |
2142 | if (ret < 0) { | |
2143 | goto error; | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | if (!ksess->metadata) { | |
2148 | /* | |
2149 | * Nothing to do for the metadata. | |
2150 | * This is a snapshot session. | |
2151 | * The metadata is genererated on the fly. | |
2152 | */ | |
2153 | continue; | |
2154 | } | |
2155 | ||
2156 | /* | |
2157 | * Clear the metadata channel. | |
2158 | * Metadata channel is not cleared per se but we still need to | |
2159 | * perform a rotation operation on it behind the scene. | |
2160 | */ | |
2161 | ret = consumer_clear_channel(socket, ksess->metadata->key); | |
2162 | if (ret < 0) { | |
2163 | goto error; | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | goto end; | |
2168 | error: | |
2169 | switch (-ret) { | |
2170 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
2171 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
2172 | break; | |
2173 | default: | |
2174 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
2175 | break; | |
2176 | } | |
2177 | end: | |
2178 | rcu_read_unlock(); | |
2179 | return status; | |
2180 | } | |
2463b787 JR |
2181 | |
2182 | enum lttng_error_code kernel_create_trigger_group_notification_fd( | |
2183 | int *trigger_group_notification_fd) | |
2184 | { | |
2185 | enum lttng_error_code error_code_ret; | |
2186 | int local_fd = -1, ret; | |
2187 | ||
2188 | assert(trigger_group_notification_fd); | |
2189 | ||
2190 | ret = kernctl_create_trigger_group_notification_fd(kernel_tracer_trigger_group_fd); | |
2191 | if (ret < 0) { | |
2192 | PERROR("ioctl kernel create trigger group"); | |
2193 | error_code_ret = LTTNG_ERR_TRIGGER_GROUP_NOTIFICATION_FD; | |
2194 | goto error; | |
2195 | } | |
2196 | ||
2197 | /* Store locally */ | |
2198 | local_fd = ret; | |
2199 | ||
2200 | /* Prevent fd duplication after execlp() */ | |
2201 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2202 | if (ret < 0) { | |
2203 | PERROR("fcntl session fd"); | |
2204 | error_code_ret = LTTNG_ERR_TRIGGER_GROUP_NOTIFICATION_FD; | |
2205 | goto error; | |
2206 | } | |
2207 | ||
2208 | DBG("Kernel trigger group notification created (fd: %d)", | |
2209 | local_fd); | |
2210 | error_code_ret = LTTNG_OK; | |
2211 | *trigger_group_notification_fd = local_fd; | |
2212 | ||
2213 | error: | |
2214 | return error_code_ret; | |
2215 | } | |
2216 | ||
2217 | enum lttng_error_code kernel_create_trigger_group_error_counter( | |
2218 | int *error_counter_fd, size_t nb_bucket) | |
2219 | { | |
2220 | enum lttng_error_code error_code_ret; | |
2221 | int local_fd = -1, ret; | |
2222 | struct lttng_kernel_counter_conf error_counter_conf; | |
2223 | ||
2224 | assert(error_counter_fd); | |
2225 | ||
2226 | error_counter_conf.arithmetic = LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR; | |
2227 | error_counter_conf.bitness = LTTNG_KERNEL_COUNTER_BITNESS_64BITS; | |
2228 | error_counter_conf.global_sum_step = 0; | |
2229 | error_counter_conf.number_dimensions = 1; | |
2230 | error_counter_conf.dimensions[0].size = nb_bucket; | |
2231 | error_counter_conf.dimensions[0].has_underflow = false; | |
2232 | error_counter_conf.dimensions[0].has_overflow = false; | |
2233 | ||
2234 | ret = kernctl_create_trigger_group_error_counter( | |
2235 | kernel_tracer_trigger_group_fd, &error_counter_conf); | |
2236 | if (ret < 0) { | |
2237 | PERROR("ioctl kernel create trigger group error counter"); | |
2238 | error_code_ret = LTTNG_ERR_TRIGGER_GROUP_ERROR_COUNTER; | |
2239 | goto error; | |
2240 | } | |
2241 | ||
2242 | /* Store locally */ | |
2243 | local_fd = ret; | |
2244 | ||
2245 | /* Prevent fd duplication after execlp() */ | |
2246 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2247 | if (ret < 0) { | |
2248 | error_code_ret = LTTNG_ERR_TRIGGER_GROUP_ERROR_COUNTER; | |
2249 | PERROR("fcntl session fd"); | |
2250 | } | |
2251 | ||
2252 | DBG("Kernel trigger group error counter (fd: %d)", | |
2253 | local_fd); | |
2254 | error_code_ret = LTTNG_OK; | |
2255 | ||
2256 | error: | |
2257 | *error_counter_fd = local_fd; | |
2258 | return error_code_ret; | |
2259 | } | |
2260 | ||
2261 | enum lttng_error_code kernel_destroy_trigger_group_notification_fd( | |
2262 | int trigger_group_notification_fd) | |
2263 | { | |
2264 | enum lttng_error_code ret = LTTNG_OK; | |
2265 | DBG("Closing trigger group notification fd %d", trigger_group_notification_fd); | |
2266 | if (trigger_group_notification_fd >= 0) { | |
2267 | ret = close(trigger_group_notification_fd); | |
2268 | if (ret) { | |
2269 | PERROR("close"); | |
2270 | } | |
2271 | } | |
2272 | return ret; | |
2273 | } | |
2274 | ||
2275 | static | |
2276 | unsigned long hash_trigger(struct lttng_trigger *trigger) | |
2277 | { | |
2278 | const struct lttng_condition *condition = | |
2279 | lttng_trigger_get_const_condition(trigger); | |
2280 | return lttng_condition_hash(condition); | |
2281 | } | |
2282 | ||
2283 | static | |
2284 | int match_trigger(struct cds_lfht_node *node, const void *key) | |
2285 | { | |
2286 | struct ltt_kernel_token_event_rule *token; | |
2287 | const struct lttng_trigger *trigger = key; | |
2288 | ||
2289 | token = caa_container_of(node, struct ltt_kernel_token_event_rule, ht_node); | |
2290 | ||
2291 | return lttng_trigger_is_equal(trigger, token->trigger); | |
2292 | } | |
2293 | ||
2294 | static enum lttng_error_code kernel_create_token_event_rule(struct lttng_trigger *trigger, | |
2295 | const struct lttng_credentials *creds, uint64_t token) | |
2296 | { | |
2297 | int err, fd, ret = 0; | |
2298 | enum lttng_error_code error_code_ret; | |
2299 | struct ltt_kernel_token_event_rule *event; | |
2300 | struct lttng_kernel_trigger kernel_trigger = {}; | |
2301 | unsigned int capture_bytecode_count = 0; | |
2302 | struct lttng_condition *condition = NULL; | |
2303 | struct lttng_event_rule *event_rule = NULL; | |
2304 | ||
2305 | assert(trigger); | |
2306 | ||
2307 | condition = lttng_trigger_get_condition(trigger); | |
2308 | assert(condition); | |
2309 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
2310 | ||
2311 | lttng_condition_event_rule_get_rule_mutable(condition, &event_rule); | |
2312 | assert(event_rule); | |
2313 | assert(lttng_event_rule_get_type(event_rule) != LTTNG_EVENT_RULE_TYPE_UNKNOWN); | |
2314 | ||
2315 | error_code_ret = trace_kernel_create_token_event_rule(trigger, token, | |
2316 | lttng_trigger_get_error_counter_index(trigger), &event); | |
2317 | if (error_code_ret != LTTNG_OK) { | |
2318 | goto error; | |
2319 | } | |
2320 | ||
2321 | trace_kernel_init_trigger_from_event_rule(event_rule, &kernel_trigger); | |
2322 | kernel_trigger.id = event->token; | |
2323 | kernel_trigger.error_counter_idx = lttng_trigger_get_error_counter_index(trigger); | |
2324 | ||
2325 | fd = kernctl_create_trigger(kernel_tracer_trigger_group_fd, &kernel_trigger); | |
2326 | if (fd < 0) { | |
2327 | switch (-fd) { | |
2328 | case EEXIST: | |
2329 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2330 | break; | |
2331 | case ENOSYS: | |
2332 | WARN("Trigger type not implemented"); | |
2333 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2334 | break; | |
2335 | case ENOENT: | |
2336 | WARN("Event %s not found!", kernel_trigger.name); | |
2337 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2338 | break; | |
2339 | default: | |
2340 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2341 | PERROR("create trigger ioctl"); | |
2342 | } | |
2343 | goto free_event; | |
2344 | } | |
2345 | ||
2346 | event->fd = fd; | |
2347 | /* Prevent fd duplication after execlp() */ | |
2348 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); | |
2349 | if (err < 0) { | |
2350 | PERROR("fcntl session fd"); | |
2351 | } | |
2352 | ||
2353 | if (event->filter) { | |
2354 | err = kernctl_filter(event->fd, event->filter); | |
2355 | if (err < 0) { | |
2356 | switch (-err) { | |
2357 | case ENOMEM: | |
2358 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2359 | break; | |
2360 | default: | |
2361 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2362 | break; | |
2363 | } | |
2364 | goto filter_error; | |
2365 | } | |
2366 | } | |
2367 | ||
2368 | if (lttng_event_rule_get_type(event_rule) == | |
2369 | LTTNG_EVENT_RULE_TYPE_UPROBE) { | |
2370 | ret = userspace_probe_event_rule_add_callsites( | |
2371 | event_rule, creds, event->fd); | |
2372 | if (ret) { | |
2373 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2374 | goto add_callsite_error; | |
2375 | } | |
2376 | } | |
2377 | ||
2378 | /* Set the capture bytecode */ | |
2379 | capture_bytecode_count = lttng_trigger_get_capture_bytecode_count(trigger); | |
2380 | for (unsigned int i = 0; i < capture_bytecode_count; i++) { | |
2381 | const struct lttng_bytecode *capture_bytecode = lttng_trigger_get_capture_bytecode_at_index(trigger, i); | |
2382 | ret = kernctl_capture(event->fd, capture_bytecode); | |
2383 | if (ret < 0) { | |
2384 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2385 | goto error; | |
2386 | } | |
2387 | } | |
2388 | ||
2389 | err = kernctl_enable(event->fd); | |
2390 | if (err < 0) { | |
2391 | switch (-err) { | |
2392 | case EEXIST: | |
2393 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2394 | break; | |
2395 | default: | |
2396 | PERROR("enable kernel trigger"); | |
2397 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2398 | break; | |
2399 | } | |
2400 | goto enable_error; | |
2401 | } | |
2402 | ||
2403 | /* Add trigger to kernel token mapping in the hashtable. */ | |
2404 | cds_lfht_add(kernel_tracer_token_ht, hash_trigger(trigger), | |
2405 | &event->ht_node); | |
2406 | ||
2407 | DBG("Trigger %s created (fd: %d)", kernel_trigger.name, event->fd); | |
2408 | ||
2409 | return LTTNG_OK; | |
2410 | ||
2411 | add_callsite_error: | |
2412 | enable_error: | |
2413 | filter_error: | |
2414 | { | |
2415 | int closeret; | |
2416 | ||
2417 | closeret = close(event->fd); | |
2418 | if (closeret) { | |
2419 | PERROR("close event fd"); | |
2420 | } | |
2421 | } | |
2422 | free_event: | |
2423 | free(event); | |
2424 | error: | |
2425 | return error_code_ret; | |
2426 | } | |
2427 | ||
2428 | enum lttng_error_code kernel_register_trigger(struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds) | |
2429 | { | |
2430 | enum lttng_error_code ret; | |
2431 | struct lttng_condition *condition; | |
2432 | struct lttng_event_rule *event_rule; | |
2433 | uint64_t token; | |
2434 | ||
2435 | /* TODO error handling */ | |
2436 | ||
2437 | rcu_read_lock(); | |
2438 | pthread_mutex_lock(¬ification_trigger_tokens_ht_lock); | |
2439 | ||
2440 | /* TODO: error checking and type checking */ | |
2441 | token = lttng_trigger_get_tracer_token(trigger); | |
2442 | condition = lttng_trigger_get_condition(trigger); | |
2443 | (void) lttng_condition_event_rule_get_rule_mutable(condition, &event_rule); | |
2444 | ||
2445 | assert(lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL); | |
2446 | ||
2447 | ret = kernel_create_token_event_rule(trigger, cmd_creds, token); | |
2448 | if (ret != LTTNG_OK) { | |
2449 | ERR("Failed to create kernel trigger token."); | |
2450 | } | |
2451 | ||
2452 | rcu_read_unlock(); | |
2453 | pthread_mutex_unlock(¬ification_trigger_tokens_ht_lock); | |
2454 | return ret; | |
2455 | } | |
2456 | ||
2457 | enum lttng_error_code kernel_unregister_trigger(struct lttng_trigger *trigger) | |
2458 | { | |
2459 | struct ltt_kernel_token_event_rule *token_event_rule_element; | |
2460 | struct cds_lfht_node *node; | |
2461 | struct cds_lfht_iter iter; | |
2462 | enum lttng_error_code error_code_ret; | |
2463 | int ret; | |
2464 | ||
2465 | rcu_read_lock(); | |
2466 | pthread_mutex_unlock(¬ification_trigger_tokens_ht_lock); | |
2467 | ||
2468 | cds_lfht_lookup(kernel_tracer_token_ht, hash_trigger(trigger), | |
2469 | match_trigger, trigger, &iter); | |
2470 | node = cds_lfht_iter_get_node(&iter); | |
2471 | if (!node) { | |
2472 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2473 | goto error; | |
2474 | } | |
2475 | ||
2476 | token_event_rule_element = caa_container_of(node, | |
2477 | struct ltt_kernel_token_event_rule, ht_node); | |
2478 | ||
2479 | ret = kernel_disable_token_event_rule(token_event_rule_element); | |
2480 | if (ret) { | |
2481 | error_code_ret = LTTNG_ERR_FATAL; | |
2482 | goto error; | |
2483 | } | |
2484 | ||
2485 | trace_kernel_destroy_token_event_rule(token_event_rule_element); | |
2486 | ||
2487 | rcu_read_unlock(); | |
2488 | pthread_mutex_unlock(¬ification_trigger_tokens_ht_lock); | |
2489 | ||
2490 | error_code_ret = LTTNG_OK; | |
2491 | ||
2492 | error: | |
2493 | return error_code_ret; | |
2494 | } | |
2495 | ||
2496 | int kernel_get_notification_fd(void) | |
2497 | { | |
2498 | return kernel_tracer_trigger_group_notification_fd; | |
2499 | } |