Commit | Line | Data |
---|---|---|
20fe2104 | 1 | /* |
a4eb26f0 | 2 | * Copyright (C) 2011 EfficiOS Inc. |
20fe2104 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
20fe2104 | 5 | * |
20fe2104 DG |
6 | */ |
7 | ||
f953b297 JG |
8 | #include "bin/lttng-sessiond/tracker.h" |
9 | #include "common/tracker.h" | |
10 | #include "common/utils.h" | |
70513913 | 11 | #include "lttng/event.h" |
f953b297 JG |
12 | #include "lttng/lttng-error.h" |
13 | #include "lttng/tracker.h" | |
6c1c0768 | 14 | #define _LGPL_SOURCE |
7b395890 | 15 | #include <fcntl.h> |
20fe2104 DG |
16 | #include <stdlib.h> |
17 | #include <stdio.h> | |
f34daff7 | 18 | #include <string.h> |
8c0faa1d | 19 | #include <unistd.h> |
77c7c900 | 20 | #include <inttypes.h> |
7d268848 | 21 | #include <sys/types.h> |
20fe2104 | 22 | |
990570ed | 23 | #include <common/common.h> |
82b69413 | 24 | #include <common/trace-chunk.h> |
db758600 | 25 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 26 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 27 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 28 | |
7d268848 MD |
29 | #include "lttng-sessiond.h" |
30 | #include "lttng-syscall.h" | |
2f77fc4b | 31 | #include "consumer.h" |
4771f025 | 32 | #include "kernel.h" |
6dc3064a | 33 | #include "kernel-consumer.h" |
096102bd | 34 | #include "kern-modules.h" |
834978fd | 35 | #include "utils.h" |
5c408ad8 | 36 | #include "rotate.h" |
7d268848 | 37 | #include "modprobe.h" |
20fe2104 | 38 | |
e1f3997a JD |
39 | /* |
40 | * Key used to reference a channel between the sessiond and the consumer. This | |
41 | * is only read and updated with the session_list lock held. | |
42 | */ | |
43 | static uint64_t next_kernel_channel_key; | |
44 | ||
7d268848 MD |
45 | static const char *module_proc_lttng = "/proc/lttng"; |
46 | ||
47 | static int kernel_tracer_fd = -1; | |
48 | ||
410b78a0 FD |
49 | #include <lttng/userspace-probe.h> |
50 | #include <lttng/userspace-probe-internal.h> | |
fd44f493 OD |
51 | /* |
52 | * On some architectures, calling convention details are embedded in the symbol | |
53 | * addresses. Uprobe requires a "clean" symbol offset (or at least, an address | |
54 | * where an instruction boundary would be legal) to add | |
55 | * instrumentation. sanitize_uprobe_offset implements that sanitization logic on | |
56 | * a per-architecture basis. | |
57 | */ | |
58 | #if defined(__arm__) || defined(__aarch64__) | |
59 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
60 | { | |
61 | /* | |
62 | * The least significant bit is used when branching to switch to thumb | |
63 | * ISA. However, it's an invalid address for us; mask the least | |
64 | * significant bit. | |
65 | */ | |
66 | return raw_offset &= ~0b1; | |
67 | } | |
68 | #else /* defined(__arm__) || defined(__aarch64__) */ | |
69 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
70 | { | |
71 | return raw_offset; | |
72 | } | |
73 | #endif | |
74 | ||
d65106b1 | 75 | /* |
050349bb | 76 | * Add context on a kernel channel. |
df3c77c8 JG |
77 | * |
78 | * Assumes the ownership of ctx. | |
d65106b1 DG |
79 | */ |
80 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 81 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
82 | { |
83 | int ret; | |
84 | ||
0525e9ae DG |
85 | assert(chan); |
86 | assert(ctx); | |
87 | ||
d65106b1 | 88 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 89 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 90 | if (ret < 0) { |
32af2c95 | 91 | switch (-ret) { |
1ae5e83e JD |
92 | case ENOSYS: |
93 | /* Exists but not available for this kernel */ | |
94 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
95 | goto error; | |
96 | case EEXIST: | |
b579acd9 DG |
97 | /* If EEXIST, we just ignore the error */ |
98 | ret = 0; | |
1ae5e83e JD |
99 | goto end; |
100 | default: | |
101 | PERROR("add context ioctl"); | |
102 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
103 | goto error; | |
b579acd9 | 104 | } |
d65106b1 | 105 | } |
21ed98c1 | 106 | ret = 0; |
d65106b1 | 107 | |
1ae5e83e | 108 | end: |
645328ae | 109 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 110 | ctx->in_list = true; |
df3c77c8 | 111 | ctx = NULL; |
d65106b1 | 112 | error: |
df3c77c8 JG |
113 | if (ctx) { |
114 | trace_kernel_destroy_context(ctx); | |
115 | } | |
d65106b1 DG |
116 | return ret; |
117 | } | |
118 | ||
20fe2104 | 119 | /* |
050349bb DG |
120 | * Create a new kernel session, register it to the kernel tracer and add it to |
121 | * the session daemon session. | |
20fe2104 | 122 | */ |
7d268848 | 123 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
124 | { |
125 | int ret; | |
126 | struct ltt_kernel_session *lks; | |
127 | ||
0525e9ae DG |
128 | assert(session); |
129 | ||
54012638 | 130 | /* Allocate data structure */ |
dec56f6c | 131 | lks = trace_kernel_create_session(); |
20fe2104 | 132 | if (lks == NULL) { |
54012638 | 133 | ret = -1; |
20fe2104 DG |
134 | goto error; |
135 | } | |
136 | ||
54012638 | 137 | /* Kernel tracer session creation */ |
7d268848 | 138 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 139 | if (ret < 0) { |
df0f840b | 140 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
141 | goto error; |
142 | } | |
143 | ||
20fe2104 | 144 | lks->fd = ret; |
7b395890 DG |
145 | /* Prevent fd duplication after execlp() */ |
146 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
147 | if (ret < 0) { | |
df0f840b | 148 | PERROR("fcntl session fd"); |
7b395890 DG |
149 | } |
150 | ||
53632229 | 151 | lks->id = session->id; |
3bd1e081 | 152 | lks->consumer_fds_sent = 0; |
8c0faa1d | 153 | session->kernel_session = lks; |
8c0faa1d DG |
154 | |
155 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 156 | |
8ff4109e JR |
157 | /* |
158 | * This is necessary since the creation time is present in the session | |
159 | * name when it is generated. | |
160 | */ | |
161 | if (session->has_auto_generated_name) { | |
162 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
163 | } else { | |
164 | ret = kernctl_session_set_name(lks->fd, session->name); | |
165 | } | |
166 | if (ret) { | |
167 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
168 | session->id, session->name); | |
169 | } | |
170 | ||
e04b2181 JR |
171 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
172 | if (ret) { | |
173 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
174 | session->id, session->name); | |
175 | } | |
176 | ||
20fe2104 DG |
177 | return 0; |
178 | ||
179 | error: | |
5f62c685 DG |
180 | if (lks) { |
181 | trace_kernel_destroy_session(lks); | |
d070c424 | 182 | trace_kernel_free_session(lks); |
5f62c685 | 183 | } |
20fe2104 DG |
184 | return ret; |
185 | } | |
186 | ||
187 | /* | |
050349bb DG |
188 | * Create a kernel channel, register it to the kernel tracer and add it to the |
189 | * kernel session. | |
20fe2104 | 190 | */ |
050349bb | 191 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 192 | struct lttng_channel *chan) |
20fe2104 DG |
193 | { |
194 | int ret; | |
195 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 196 | |
0525e9ae DG |
197 | assert(session); |
198 | assert(chan); | |
0525e9ae | 199 | |
54012638 | 200 | /* Allocate kernel channel */ |
fdd9eb17 | 201 | lkc = trace_kernel_create_channel(chan); |
54012638 | 202 | if (lkc == NULL) { |
20fe2104 DG |
203 | goto error; |
204 | } | |
205 | ||
ecc48a90 | 206 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 207 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
208 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
209 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 210 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 211 | |
54012638 | 212 | /* Kernel tracer channel creation */ |
f3ed775e | 213 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 214 | if (ret < 0) { |
df0f840b | 215 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
216 | goto error; |
217 | } | |
218 | ||
54012638 | 219 | /* Setup the channel fd */ |
20fe2104 | 220 | lkc->fd = ret; |
7b395890 DG |
221 | /* Prevent fd duplication after execlp() */ |
222 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
223 | if (ret < 0) { | |
df0f840b | 224 | PERROR("fcntl session fd"); |
7b395890 DG |
225 | } |
226 | ||
54012638 | 227 | /* Add channel to session */ |
8c0faa1d DG |
228 | cds_list_add(&lkc->list, &session->channel_list.head); |
229 | session->channel_count++; | |
fb5f35b6 | 230 | lkc->session = session; |
e1f3997a | 231 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 232 | |
e1f3997a JD |
233 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
234 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
235 | |
236 | return 0; | |
237 | ||
238 | error: | |
5f62c685 DG |
239 | if (lkc) { |
240 | free(lkc->channel); | |
241 | free(lkc); | |
242 | } | |
54012638 | 243 | return -1; |
20fe2104 | 244 | } |
f34daff7 | 245 | |
410b78a0 FD |
246 | /* |
247 | * Compute the offset of the instrumentation byte in the binary based on the | |
248 | * function probe location using the ELF lookup method. | |
249 | * | |
250 | * Returns 0 on success and set the offset out parameter to the offset of the | |
251 | * elf symbol | |
252 | * Returns -1 on error | |
253 | */ | |
254 | static | |
255 | int extract_userspace_probe_offset_function_elf( | |
87597c2c | 256 | const struct lttng_userspace_probe_location *probe_location, |
410b78a0 FD |
257 | struct ltt_kernel_session *session, uint64_t *offset) |
258 | { | |
259 | int fd; | |
260 | int ret = 0; | |
261 | const char *symbol = NULL; | |
87597c2c | 262 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
263 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
264 | ||
410b78a0 FD |
265 | assert(lttng_userspace_probe_location_get_type(probe_location) == |
266 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); | |
267 | ||
268 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
269 | probe_location); | |
270 | if (!lookup) { | |
271 | ret = -1; | |
272 | goto end; | |
273 | } | |
274 | ||
275 | lookup_method_type = | |
276 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
277 | ||
278 | assert(lookup_method_type == | |
279 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); | |
280 | ||
281 | symbol = lttng_userspace_probe_location_function_get_function_name( | |
282 | probe_location); | |
283 | if (!symbol) { | |
284 | ret = -1; | |
285 | goto end; | |
286 | } | |
287 | ||
288 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
289 | if (fd < 0) { | |
290 | ret = -1; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | ret = run_as_extract_elf_symbol_offset(fd, symbol, session->uid, | |
295 | session->gid, offset); | |
296 | if (ret < 0) { | |
297 | DBG("userspace probe offset calculation failed for " | |
298 | "function %s", symbol); | |
299 | goto end; | |
300 | } | |
301 | ||
302 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t)(*offset)); | |
303 | end: | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
309 | * tracepoint probe location using the SDT lookup method. This function | |
310 | * allocates the offsets buffer, the caller must free it. | |
311 | * | |
312 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
313 | * SDT tracepoint. | |
314 | * Returns -1 on error. | |
315 | */ | |
316 | static | |
317 | int extract_userspace_probe_offset_tracepoint_sdt( | |
87597c2c | 318 | const struct lttng_userspace_probe_location *probe_location, |
410b78a0 FD |
319 | struct ltt_kernel_session *session, uint64_t **offsets, |
320 | uint32_t *offsets_count) | |
321 | { | |
322 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
87597c2c | 323 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
324 | const char *probe_name = NULL, *provider_name = NULL; |
325 | int ret = 0; | |
326 | int fd, i; | |
327 | ||
328 | assert(lttng_userspace_probe_location_get_type(probe_location) == | |
329 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); | |
330 | ||
331 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
332 | if (!lookup) { | |
333 | ret = -1; | |
334 | goto end; | |
335 | } | |
336 | ||
337 | lookup_method_type = | |
338 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
339 | ||
340 | assert(lookup_method_type == | |
341 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); | |
342 | ||
343 | ||
344 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name( | |
345 | probe_location); | |
346 | if (!probe_name) { | |
347 | ret = -1; | |
348 | goto end; | |
349 | } | |
350 | ||
351 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name( | |
352 | probe_location); | |
353 | if (!provider_name) { | |
354 | ret = -1; | |
355 | goto end; | |
356 | } | |
357 | ||
358 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
359 | if (fd < 0) { | |
360 | ret = -1; | |
361 | goto end; | |
362 | } | |
363 | ||
364 | ret = run_as_extract_sdt_probe_offsets(fd, provider_name, probe_name, | |
365 | session->uid, session->gid, offsets, offsets_count); | |
366 | if (ret < 0) { | |
367 | DBG("userspace probe offset calculation failed for sdt " | |
368 | "probe %s:%s", provider_name, probe_name); | |
369 | goto end; | |
370 | } | |
371 | ||
372 | if (*offsets_count == 0) { | |
373 | DBG("no userspace probe offset found"); | |
374 | goto end; | |
375 | } | |
376 | ||
377 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
378 | *offsets_count, provider_name, probe_name); | |
379 | for (i = 0; i < *offsets_count; i++) { | |
380 | DBG("\t0x%jd", (intmax_t)((*offsets)[i])); | |
381 | } | |
382 | end: | |
383 | return ret; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Extract the offsets of the instrumentation point for the different lookup | |
388 | * methods. | |
389 | */ | |
390 | static | |
391 | int userspace_probe_add_callsites(struct lttng_event *ev, | |
392 | struct ltt_kernel_session *session, int fd) | |
393 | { | |
87597c2c | 394 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
410b78a0 | 395 | enum lttng_userspace_probe_location_lookup_method_type type; |
87597c2c | 396 | const struct lttng_userspace_probe_location *location = NULL; |
410b78a0 FD |
397 | int ret; |
398 | ||
399 | assert(ev); | |
400 | assert(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
401 | ||
402 | location = lttng_event_get_userspace_probe_location(ev); | |
403 | if (!location) { | |
404 | ret = -1; | |
405 | goto end; | |
406 | } | |
407 | lookup_method = | |
408 | lttng_userspace_probe_location_get_lookup_method(location); | |
409 | if (!lookup_method) { | |
410 | ret = -1; | |
411 | goto end; | |
412 | } | |
413 | ||
414 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
415 | switch (type) { | |
416 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
417 | { | |
418 | struct lttng_kernel_event_callsite callsite; | |
419 | uint64_t offset; | |
420 | ||
421 | ret = extract_userspace_probe_offset_function_elf(location, session, &offset); | |
422 | if (ret) { | |
423 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
424 | goto end; | |
425 | } | |
426 | ||
fd44f493 | 427 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offset); |
410b78a0 FD |
428 | ret = kernctl_add_callsite(fd, &callsite); |
429 | if (ret) { | |
430 | WARN("Adding callsite to userspace probe " | |
431 | "event %s failed.", ev->name); | |
432 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
433 | goto end; | |
434 | } | |
435 | break; | |
436 | } | |
437 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
438 | { | |
439 | int i; | |
440 | uint64_t *offsets = NULL; | |
441 | uint32_t offsets_count; | |
442 | struct lttng_kernel_event_callsite callsite; | |
443 | ||
444 | /* | |
445 | * This call allocates the offsets buffer. This buffer must be freed | |
446 | * by the caller | |
447 | */ | |
448 | ret = extract_userspace_probe_offset_tracepoint_sdt(location, session, | |
449 | &offsets, &offsets_count); | |
450 | if (ret) { | |
451 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
452 | goto end; | |
453 | } | |
454 | for (i = 0; i < offsets_count; i++) { | |
fd44f493 | 455 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offsets[i]); |
410b78a0 FD |
456 | ret = kernctl_add_callsite(fd, &callsite); |
457 | if (ret) { | |
458 | WARN("Adding callsite to userspace probe " | |
459 | "event %s failed.", ev->name); | |
460 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
461 | free(offsets); | |
462 | goto end; | |
463 | } | |
464 | } | |
465 | free(offsets); | |
466 | break; | |
467 | } | |
468 | default: | |
469 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
470 | goto end; | |
471 | } | |
472 | end: | |
473 | return ret; | |
474 | } | |
475 | ||
f34daff7 | 476 | /* |
050349bb DG |
477 | * Create a kernel event, enable it to the kernel tracer and add it to the |
478 | * channel event list of the kernel session. | |
49d21f93 | 479 | * We own filter_expression and filter. |
f34daff7 | 480 | */ |
050349bb | 481 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
482 | struct ltt_kernel_channel *channel, |
483 | char *filter_expression, | |
484 | struct lttng_filter_bytecode *filter) | |
f34daff7 | 485 | { |
71a3bb01 FD |
486 | int err, fd; |
487 | enum lttng_error_code ret; | |
f34daff7 | 488 | struct ltt_kernel_event *event; |
f34daff7 | 489 | |
0525e9ae DG |
490 | assert(ev); |
491 | assert(channel); | |
492 | ||
a969e101 | 493 | /* We pass ownership of filter_expression and filter */ |
71a3bb01 FD |
494 | ret = trace_kernel_create_event(ev, filter_expression, |
495 | filter, &event); | |
496 | if (ret != LTTNG_OK) { | |
f34daff7 DG |
497 | goto error; |
498 | } | |
499 | ||
71a3bb01 FD |
500 | fd = kernctl_create_event(channel->fd, event->event); |
501 | if (fd < 0) { | |
502 | switch (-fd) { | |
bd29c13d | 503 | case EEXIST: |
71a3bb01 | 504 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
505 | break; |
506 | case ENOSYS: | |
507 | WARN("Event type not implemented"); | |
71a3bb01 | 508 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 509 | break; |
8197a339 DG |
510 | case ENOENT: |
511 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 512 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 513 | break; |
bd29c13d | 514 | default: |
71a3bb01 | 515 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
516 | PERROR("create event ioctl"); |
517 | } | |
e953ef25 | 518 | goto free_event; |
8c0faa1d | 519 | } |
f34daff7 | 520 | |
d0ae4ea8 | 521 | event->type = ev->type; |
71a3bb01 | 522 | event->fd = fd; |
7b395890 | 523 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
524 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
525 | if (err < 0) { | |
df0f840b | 526 | PERROR("fcntl session fd"); |
7b395890 DG |
527 | } |
528 | ||
00a62084 | 529 | if (filter) { |
71a3bb01 FD |
530 | err = kernctl_filter(event->fd, filter); |
531 | if (err < 0) { | |
532 | switch (-err) { | |
533 | case ENOMEM: | |
534 | ret = LTTNG_ERR_FILTER_NOMEM; | |
535 | break; | |
536 | default: | |
537 | ret = LTTNG_ERR_FILTER_INVAL; | |
538 | break; | |
539 | } | |
00a62084 MD |
540 | goto filter_error; |
541 | } | |
542 | } | |
543 | ||
dcabc190 FD |
544 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
545 | ret = userspace_probe_add_callsites(ev, channel->session, event->fd); | |
546 | if (ret) { | |
547 | goto add_callsite_error; | |
548 | } | |
549 | } | |
550 | ||
71a3bb01 FD |
551 | err = kernctl_enable(event->fd); |
552 | if (err < 0) { | |
553 | switch (-err) { | |
00a62084 MD |
554 | case EEXIST: |
555 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
556 | break; | |
557 | default: | |
558 | PERROR("enable kernel event"); | |
71a3bb01 | 559 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
560 | break; |
561 | } | |
562 | goto enable_error; | |
563 | } | |
564 | ||
f3ed775e DG |
565 | /* Add event to event list */ |
566 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
567 | channel->event_count++; |
568 | ||
e953ef25 DG |
569 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
570 | ||
571 | return 0; | |
572 | ||
dcabc190 | 573 | add_callsite_error: |
00a62084 MD |
574 | enable_error: |
575 | filter_error: | |
576 | { | |
577 | int closeret; | |
578 | ||
579 | closeret = close(event->fd); | |
580 | if (closeret) { | |
581 | PERROR("close event fd"); | |
582 | } | |
583 | } | |
e953ef25 DG |
584 | free_event: |
585 | free(event); | |
586 | error: | |
d87bfb32 | 587 | return ret; |
e953ef25 DG |
588 | } |
589 | ||
26cc6b4e | 590 | /* |
050349bb | 591 | * Disable a kernel channel. |
26cc6b4e DG |
592 | */ |
593 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
594 | { | |
595 | int ret; | |
596 | ||
0525e9ae DG |
597 | assert(chan); |
598 | ||
26cc6b4e DG |
599 | ret = kernctl_disable(chan->fd); |
600 | if (ret < 0) { | |
df0f840b | 601 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
602 | goto error; |
603 | } | |
604 | ||
605 | chan->enabled = 0; | |
e1f3997a JD |
606 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
607 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
608 | |
609 | return 0; | |
610 | ||
611 | error: | |
612 | return ret; | |
613 | } | |
614 | ||
d36b8583 | 615 | /* |
050349bb | 616 | * Enable a kernel channel. |
d36b8583 DG |
617 | */ |
618 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
619 | { | |
620 | int ret; | |
621 | ||
0525e9ae DG |
622 | assert(chan); |
623 | ||
d36b8583 | 624 | ret = kernctl_enable(chan->fd); |
32af2c95 | 625 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 626 | PERROR("Enable kernel chan"); |
d36b8583 DG |
627 | goto error; |
628 | } | |
629 | ||
630 | chan->enabled = 1; | |
e1f3997a JD |
631 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
632 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
633 | |
634 | return 0; | |
635 | ||
636 | error: | |
637 | return ret; | |
638 | } | |
639 | ||
19e70852 | 640 | /* |
050349bb | 641 | * Enable a kernel event. |
19e70852 DG |
642 | */ |
643 | int kernel_enable_event(struct ltt_kernel_event *event) | |
644 | { | |
645 | int ret; | |
646 | ||
0525e9ae DG |
647 | assert(event); |
648 | ||
19e70852 | 649 | ret = kernctl_enable(event->fd); |
42224349 | 650 | if (ret < 0) { |
32af2c95 | 651 | switch (-ret) { |
42224349 | 652 | case EEXIST: |
f73fabfd | 653 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
654 | break; |
655 | default: | |
656 | PERROR("enable kernel event"); | |
657 | break; | |
658 | } | |
19e70852 DG |
659 | goto error; |
660 | } | |
661 | ||
662 | event->enabled = 1; | |
663 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
664 | ||
665 | return 0; | |
666 | ||
667 | error: | |
d36b8583 | 668 | return ret; |
19e70852 DG |
669 | } |
670 | ||
e953ef25 | 671 | /* |
050349bb | 672 | * Disable a kernel event. |
e953ef25 | 673 | */ |
19e70852 | 674 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
675 | { |
676 | int ret; | |
19e70852 | 677 | |
0525e9ae DG |
678 | assert(event); |
679 | ||
19e70852 | 680 | ret = kernctl_disable(event->fd); |
42224349 | 681 | if (ret < 0) { |
5f09aaf1 JG |
682 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
683 | event->event->name, event->fd); | |
19e70852 | 684 | goto error; |
e953ef25 | 685 | } |
f3ed775e | 686 | |
19e70852 DG |
687 | event->enabled = 0; |
688 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
689 | ||
f34daff7 DG |
690 | return 0; |
691 | ||
692 | error: | |
d36b8583 | 693 | return ret; |
f34daff7 | 694 | } |
aaf26714 | 695 | |
f953b297 JG |
696 | static |
697 | struct process_attr_tracker *_kernel_get_process_attr_tracker( | |
55c9e7ca | 698 | struct ltt_kernel_session *session, |
f953b297 | 699 | enum lttng_process_attr process_attr) |
55c9e7ca | 700 | { |
f953b297 JG |
701 | switch (process_attr) { |
702 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
703 | return session->tracker_pid; | |
704 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
705 | return session->tracker_vpid; | |
706 | case LTTNG_PROCESS_ATTR_USER_ID: | |
707 | return session->tracker_uid; | |
708 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
709 | return session->tracker_vuid; | |
710 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
711 | return session->tracker_gid; | |
712 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
713 | return session->tracker_vgid; | |
55c9e7ca JR |
714 | default: |
715 | return NULL; | |
716 | } | |
717 | } | |
6e911cad | 718 | |
f953b297 | 719 | const struct process_attr_tracker *kernel_get_process_attr_tracker( |
55c9e7ca | 720 | struct ltt_kernel_session *session, |
f953b297 | 721 | enum lttng_process_attr process_attr) |
ccf10263 | 722 | { |
f953b297 JG |
723 | return (const struct process_attr_tracker *) |
724 | _kernel_get_process_attr_tracker(session, process_attr); | |
725 | } | |
7c493d31 | 726 | |
f953b297 JG |
727 | enum lttng_error_code kernel_process_attr_tracker_set_tracking_policy( |
728 | struct ltt_kernel_session *session, | |
729 | enum lttng_process_attr process_attr, | |
730 | enum lttng_tracking_policy policy) | |
731 | { | |
732 | int ret; | |
733 | enum lttng_error_code ret_code = LTTNG_OK; | |
734 | struct process_attr_tracker *tracker = | |
735 | _kernel_get_process_attr_tracker(session, process_attr); | |
736 | enum lttng_tracking_policy previous_policy; | |
55c9e7ca | 737 | |
f953b297 JG |
738 | if (!tracker) { |
739 | ret_code = LTTNG_ERR_INVALID; | |
740 | goto end; | |
7c493d31 | 741 | } |
ccf10263 | 742 | |
f953b297 JG |
743 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
744 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
745 | if (ret) { | |
746 | ret_code = LTTNG_ERR_UNK; | |
747 | goto end; | |
55c9e7ca | 748 | } |
7c493d31 | 749 | |
f953b297 | 750 | if (previous_policy == policy) { |
55c9e7ca | 751 | goto end; |
7c493d31 | 752 | } |
55c9e7ca | 753 | |
f953b297 JG |
754 | switch (policy) { |
755 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
756 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
757 | /* | |
758 | * Maintain a special case for the process ID process | |
759 | * attribute tracker as it was the only supported | |
760 | * attribute prior to 2.12. | |
761 | */ | |
762 | ret = kernctl_track_pid(session->fd, -1); | |
763 | } else { | |
764 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
765 | } |
766 | break; | |
f953b297 JG |
767 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
768 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
769 | /* fall-through. */ | |
770 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
771 | /* | |
772 | * Maintain a special case for the process ID process | |
773 | * attribute tracker as it was the only supported | |
774 | * attribute prior to 2.12. | |
775 | */ | |
776 | ret = kernctl_untrack_pid(session->fd, -1); | |
777 | } else { | |
778 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
779 | } |
780 | break; | |
781 | default: | |
f953b297 | 782 | abort(); |
55c9e7ca | 783 | } |
f953b297 | 784 | /* kern-ctl error handling */ |
32af2c95 | 785 | switch (-ret) { |
f953b297 JG |
786 | case 0: |
787 | ret_code = LTTNG_OK; | |
788 | break; | |
7c493d31 | 789 | case EINVAL: |
f953b297 | 790 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 791 | break; |
7c493d31 | 792 | case ENOMEM: |
f953b297 | 793 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
794 | break; |
795 | case EEXIST: | |
f953b297 | 796 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 797 | break; |
7c493d31 | 798 | default: |
f953b297 | 799 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
800 | break; |
801 | } | |
55c9e7ca | 802 | end: |
f953b297 | 803 | return ret_code; |
ccf10263 MD |
804 | } |
805 | ||
f953b297 | 806 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_add_value( |
55c9e7ca | 807 | struct ltt_kernel_session *session, |
f953b297 JG |
808 | enum lttng_process_attr process_attr, |
809 | const struct process_attr_value *value) | |
a5dfbb9d | 810 | { |
f953b297 JG |
811 | int ret, integral_value; |
812 | enum lttng_error_code ret_code; | |
813 | struct process_attr_tracker *tracker; | |
814 | enum process_attr_tracker_status status; | |
a5dfbb9d | 815 | |
f953b297 JG |
816 | /* |
817 | * Convert process attribute tracker value to the integral | |
818 | * representation required by the kern-ctl API. | |
819 | */ | |
820 | switch (process_attr) { | |
821 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
822 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
823 | integral_value = (int) value->value.pid; | |
55c9e7ca | 824 | break; |
f953b297 JG |
825 | case LTTNG_PROCESS_ATTR_USER_ID: |
826 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
827 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
828 | uid_t uid; | |
829 | ||
830 | ret_code = utils_user_id_from_name( | |
831 | value->value.user_name, &uid); | |
832 | if (ret_code != LTTNG_OK) { | |
833 | goto end; | |
834 | } | |
835 | integral_value = (int) uid; | |
836 | } else { | |
837 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
838 | } |
839 | break; | |
f953b297 JG |
840 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
841 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
842 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
843 | gid_t gid; | |
844 | ||
845 | ret_code = utils_group_id_from_name( | |
846 | value->value.group_name, &gid); | |
847 | if (ret_code != LTTNG_OK) { | |
848 | goto end; | |
849 | } | |
850 | integral_value = (int) gid; | |
851 | } else { | |
852 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 853 | } |
55c9e7ca JR |
854 | break; |
855 | default: | |
f953b297 JG |
856 | ret_code = LTTNG_ERR_INVALID; |
857 | goto end; | |
55c9e7ca JR |
858 | } |
859 | ||
f953b297 JG |
860 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
861 | if (!tracker) { | |
862 | ret_code = LTTNG_ERR_INVALID; | |
863 | goto end; | |
864 | } | |
865 | ||
866 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
867 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
868 | switch (status) { | |
869 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
870 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
871 | break; | |
872 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
873 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
874 | break; | |
875 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
876 | default: | |
877 | ret_code = LTTNG_ERR_UNK; | |
878 | break; | |
879 | } | |
880 | goto end; | |
881 | } | |
882 | ||
883 | DBG("Kernel track %s %d for session id %" PRIu64, | |
884 | lttng_process_attr_to_string(process_attr), | |
885 | integral_value, session->id); | |
886 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
887 | /* | |
888 | * Maintain a special case for the process ID process attribute | |
889 | * tracker as it was the only supported attribute prior to 2.12. | |
890 | */ | |
891 | ret = kernctl_track_pid(session->fd, integral_value); | |
892 | } else { | |
893 | ret = kernctl_track_id( | |
894 | session->fd, process_attr, integral_value); | |
895 | } | |
896 | if (ret == 0) { | |
897 | ret_code = LTTNG_OK; | |
898 | goto end; | |
899 | } | |
900 | ||
901 | kernel_wait_quiescent(); | |
902 | ||
903 | /* kern-ctl error handling */ | |
55c9e7ca | 904 | switch (-ret) { |
f953b297 JG |
905 | case 0: |
906 | ret_code = LTTNG_OK; | |
907 | break; | |
55c9e7ca | 908 | case EINVAL: |
f953b297 | 909 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
910 | break; |
911 | case ENOMEM: | |
f953b297 | 912 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
913 | break; |
914 | case EEXIST: | |
f953b297 | 915 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
916 | break; |
917 | default: | |
f953b297 | 918 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 919 | break; |
a5dfbb9d MD |
920 | } |
921 | ||
f953b297 JG |
922 | /* Attempt to remove the value from the tracker. */ |
923 | status = process_attr_tracker_inclusion_set_remove_value( | |
924 | tracker, value); | |
925 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
926 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
927 | lttng_process_attr_to_string(process_attr), | |
928 | integral_value); | |
55c9e7ca | 929 | } |
a5dfbb9d | 930 | end: |
f953b297 | 931 | return ret_code; |
55c9e7ca | 932 | } |
a5dfbb9d | 933 | |
f953b297 | 934 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_remove_value( |
55c9e7ca | 935 | struct ltt_kernel_session *session, |
f953b297 JG |
936 | enum lttng_process_attr process_attr, |
937 | const struct process_attr_value *value) | |
55c9e7ca | 938 | { |
f953b297 JG |
939 | int ret, integral_value; |
940 | enum lttng_error_code ret_code; | |
941 | struct process_attr_tracker *tracker; | |
942 | enum process_attr_tracker_status status; | |
943 | ||
944 | /* | |
945 | * Convert process attribute tracker value to the integral | |
946 | * representation required by the kern-ctl API. | |
947 | */ | |
948 | switch (process_attr) { | |
949 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
950 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
951 | integral_value = (int) value->value.pid; | |
952 | break; | |
953 | case LTTNG_PROCESS_ATTR_USER_ID: | |
954 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
955 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
956 | uid_t uid; | |
957 | ||
958 | ret_code = utils_user_id_from_name( | |
959 | value->value.user_name, &uid); | |
960 | if (ret_code != LTTNG_OK) { | |
961 | goto end; | |
962 | } | |
963 | integral_value = (int) uid; | |
964 | } else { | |
965 | integral_value = (int) value->value.uid; | |
966 | } | |
967 | break; | |
968 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
969 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
970 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
971 | gid_t gid; | |
972 | ||
973 | ret_code = utils_group_id_from_name( | |
974 | value->value.group_name, &gid); | |
975 | if (ret_code != LTTNG_OK) { | |
976 | goto end; | |
977 | } | |
978 | integral_value = (int) gid; | |
979 | } else { | |
980 | integral_value = (int) value->value.gid; | |
981 | } | |
982 | break; | |
983 | default: | |
984 | ret_code = LTTNG_ERR_INVALID; | |
985 | goto end; | |
986 | } | |
55c9e7ca | 987 | |
f953b297 JG |
988 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
989 | if (!tracker) { | |
990 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 991 | goto end; |
a5dfbb9d | 992 | } |
a7a533cd | 993 | |
f953b297 JG |
994 | status = process_attr_tracker_inclusion_set_remove_value( |
995 | tracker, value); | |
996 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
997 | switch (status) { | |
998 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
999 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1000 | break; | |
1001 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1002 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1003 | break; | |
1004 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1005 | default: | |
1006 | ret_code = LTTNG_ERR_UNK; | |
1007 | break; | |
1008 | } | |
a7a533cd JR |
1009 | goto end; |
1010 | } | |
1011 | ||
f953b297 JG |
1012 | DBG("Kernel track %s %d for session id %" PRIu64, |
1013 | lttng_process_attr_to_string(process_attr), | |
1014 | integral_value, session->id); | |
1015 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1016 | /* | |
1017 | * Maintain a special case for the process ID process attribute | |
1018 | * tracker as it was the only supported attribute prior to 2.12. | |
1019 | */ | |
1020 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1021 | } else { | |
1022 | ret = kernctl_untrack_id( | |
1023 | session->fd, process_attr, integral_value); | |
1024 | } | |
1025 | if (ret == 0) { | |
1026 | ret_code = LTTNG_OK; | |
1027 | goto end; | |
1028 | } | |
1029 | kernel_wait_quiescent(); | |
1030 | ||
1031 | /* kern-ctl error handling */ | |
1032 | switch (-ret) { | |
1033 | case 0: | |
1034 | ret_code = LTTNG_OK; | |
1035 | break; | |
1036 | case EINVAL: | |
1037 | ret_code = LTTNG_ERR_INVALID; | |
1038 | break; | |
1039 | case ENOMEM: | |
1040 | ret_code = LTTNG_ERR_NOMEM; | |
1041 | break; | |
1042 | case ENOENT: | |
1043 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1044 | break; | |
1045 | default: | |
1046 | ret_code = LTTNG_ERR_UNK; | |
1047 | break; | |
1048 | } | |
1049 | ||
1050 | /* Attempt to add the value to the tracker. */ | |
1051 | status = process_attr_tracker_inclusion_set_add_value( | |
1052 | tracker, value); | |
1053 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1054 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1055 | lttng_process_attr_to_string(process_attr), | |
1056 | integral_value); | |
1057 | } | |
a7a533cd | 1058 | end: |
f953b297 | 1059 | return ret_code; |
a5dfbb9d MD |
1060 | } |
1061 | ||
aaf26714 | 1062 | /* |
050349bb DG |
1063 | * Create kernel metadata, open from the kernel tracer and add it to the |
1064 | * kernel session. | |
aaf26714 | 1065 | */ |
a4b92340 | 1066 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1067 | { |
1068 | int ret; | |
74024a21 | 1069 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 1070 | |
0525e9ae DG |
1071 | assert(session); |
1072 | ||
54012638 | 1073 | /* Allocate kernel metadata */ |
a4b92340 | 1074 | lkm = trace_kernel_create_metadata(); |
54012638 | 1075 | if (lkm == NULL) { |
aaf26714 DG |
1076 | goto error; |
1077 | } | |
1078 | ||
54012638 | 1079 | /* Kernel tracer metadata creation */ |
f3ed775e | 1080 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1081 | if (ret < 0) { |
74024a21 | 1082 | goto error_open; |
aaf26714 DG |
1083 | } |
1084 | ||
8c0faa1d | 1085 | lkm->fd = ret; |
d40f0359 | 1086 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1087 | /* Prevent fd duplication after execlp() */ |
1088 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1089 | if (ret < 0) { | |
df0f840b | 1090 | PERROR("fcntl session fd"); |
7b395890 DG |
1091 | } |
1092 | ||
aaf26714 | 1093 | session->metadata = lkm; |
8c0faa1d | 1094 | |
00e2e675 | 1095 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1096 | |
1097 | return 0; | |
1098 | ||
74024a21 DG |
1099 | error_open: |
1100 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1101 | error: |
54012638 | 1102 | return -1; |
8c0faa1d DG |
1103 | } |
1104 | ||
1105 | /* | |
050349bb | 1106 | * Start tracing session. |
8c0faa1d DG |
1107 | */ |
1108 | int kernel_start_session(struct ltt_kernel_session *session) | |
1109 | { | |
1110 | int ret; | |
1111 | ||
0525e9ae DG |
1112 | assert(session); |
1113 | ||
8c0faa1d DG |
1114 | ret = kernctl_start_session(session->fd); |
1115 | if (ret < 0) { | |
df0f840b | 1116 | PERROR("ioctl start session"); |
8c0faa1d DG |
1117 | goto error; |
1118 | } | |
1119 | ||
1120 | DBG("Kernel session started"); | |
1121 | ||
1122 | return 0; | |
1123 | ||
1124 | error: | |
1125 | return ret; | |
1126 | } | |
1127 | ||
f3ed775e | 1128 | /* |
050349bb | 1129 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1130 | */ |
7d268848 | 1131 | void kernel_wait_quiescent(void) |
f3ed775e DG |
1132 | { |
1133 | int ret; | |
7d268848 | 1134 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1135 | |
1136 | DBG("Kernel quiescent wait on %d", fd); | |
1137 | ||
1138 | ret = kernctl_wait_quiescent(fd); | |
1139 | if (ret < 0) { | |
df0f840b | 1140 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1141 | ERR("Kernel quiescent wait failed"); |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /* | |
f3ed775e DG |
1146 | * Force flush buffer of metadata. |
1147 | */ | |
1148 | int kernel_metadata_flush_buffer(int fd) | |
1149 | { | |
1150 | int ret; | |
1151 | ||
169d2cb7 DG |
1152 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1153 | ||
f3ed775e DG |
1154 | ret = kernctl_buffer_flush(fd); |
1155 | if (ret < 0) { | |
00e2e675 | 1156 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1157 | } |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | /* | |
050349bb | 1163 | * Force flush buffer for channel. |
f3ed775e DG |
1164 | */ |
1165 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1166 | { | |
1167 | int ret; | |
1168 | struct ltt_kernel_stream *stream; | |
1169 | ||
0525e9ae DG |
1170 | assert(channel); |
1171 | ||
f3ed775e DG |
1172 | DBG("Flush buffer for channel %s", channel->channel->name); |
1173 | ||
1174 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
1175 | DBG("Flushing channel stream %d", stream->fd); | |
1176 | ret = kernctl_buffer_flush(stream->fd); | |
1177 | if (ret < 0) { | |
df0f840b | 1178 | PERROR("ioctl"); |
f3ed775e DG |
1179 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
1180 | stream->fd, ret); | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
8c0faa1d | 1187 | /* |
050349bb | 1188 | * Stop tracing session. |
8c0faa1d DG |
1189 | */ |
1190 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1191 | { | |
1192 | int ret; | |
1193 | ||
0525e9ae DG |
1194 | assert(session); |
1195 | ||
8c0faa1d DG |
1196 | ret = kernctl_stop_session(session->fd); |
1197 | if (ret < 0) { | |
1198 | goto error; | |
1199 | } | |
1200 | ||
1201 | DBG("Kernel session stopped"); | |
1202 | ||
1203 | return 0; | |
1204 | ||
1205 | error: | |
1206 | return ret; | |
1207 | } | |
1208 | ||
1209 | /* | |
050349bb DG |
1210 | * Open stream of channel, register it to the kernel tracer and add it |
1211 | * to the stream list of the channel. | |
8c0faa1d | 1212 | * |
1cfb4b98 MD |
1213 | * Note: given that the streams may appear in random order wrt CPU |
1214 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1215 | * the stream name is not necessarily linked to the CPU number. | |
1216 | * | |
050349bb | 1217 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1218 | */ |
f3ed775e | 1219 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1220 | { |
1cfb4b98 | 1221 | int ret; |
8c0faa1d DG |
1222 | struct ltt_kernel_stream *lks; |
1223 | ||
0525e9ae DG |
1224 | assert(channel); |
1225 | ||
5a47c6a2 | 1226 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
1227 | lks = trace_kernel_create_stream(channel->channel->name, |
1228 | channel->stream_count); | |
8c0faa1d | 1229 | if (lks == NULL) { |
799e2c4f MD |
1230 | ret = close(ret); |
1231 | if (ret) { | |
1232 | PERROR("close"); | |
1233 | } | |
8c0faa1d DG |
1234 | goto error; |
1235 | } | |
1236 | ||
1237 | lks->fd = ret; | |
7b395890 DG |
1238 | /* Prevent fd duplication after execlp() */ |
1239 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1240 | if (ret < 0) { | |
df0f840b | 1241 | PERROR("fcntl session fd"); |
7b395890 DG |
1242 | } |
1243 | ||
1624d5b7 JD |
1244 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1245 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1246 | ||
1cfb4b98 | 1247 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1248 | cds_list_add(&lks->list, &channel->stream_list.head); |
1249 | channel->stream_count++; | |
8c0faa1d | 1250 | |
00e2e675 DG |
1251 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
1252 | lks->state); | |
54012638 | 1253 | } |
8c0faa1d DG |
1254 | |
1255 | return channel->stream_count; | |
1256 | ||
1257 | error: | |
54012638 | 1258 | return -1; |
8c0faa1d DG |
1259 | } |
1260 | ||
1261 | /* | |
050349bb | 1262 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1263 | */ |
f3ed775e | 1264 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1265 | { |
1266 | int ret; | |
1267 | ||
0525e9ae DG |
1268 | assert(session); |
1269 | ||
8c0faa1d DG |
1270 | ret = kernctl_create_stream(session->metadata->fd); |
1271 | if (ret < 0) { | |
df0f840b | 1272 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1273 | goto error; |
1274 | } | |
1275 | ||
1276 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1277 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1278 | /* Prevent fd duplication after execlp() */ |
1279 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1280 | if (ret < 0) { | |
df0f840b | 1281 | PERROR("fcntl session fd"); |
7b395890 | 1282 | } |
aaf26714 DG |
1283 | |
1284 | return 0; | |
1285 | ||
1286 | error: | |
54012638 | 1287 | return -1; |
aaf26714 | 1288 | } |
2ef84c95 DG |
1289 | |
1290 | /* | |
9f19cc17 | 1291 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1292 | */ |
7d268848 | 1293 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1294 | { |
53efb85a | 1295 | int fd, ret; |
9f19cc17 DG |
1296 | char *event; |
1297 | size_t nbmem, count = 0; | |
2ef84c95 | 1298 | FILE *fp; |
9f19cc17 | 1299 | struct lttng_event *elist; |
2ef84c95 | 1300 | |
0525e9ae DG |
1301 | assert(events); |
1302 | ||
7d268848 | 1303 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1304 | if (fd < 0) { |
df0f840b | 1305 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1306 | goto error; |
1307 | } | |
1308 | ||
1309 | fp = fdopen(fd, "r"); | |
1310 | if (fp == NULL) { | |
df0f840b | 1311 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1312 | goto error_fp; |
2ef84c95 DG |
1313 | } |
1314 | ||
1315 | /* | |
1316 | * Init memory size counter | |
1317 | * See kernel-ctl.h for explanation of this value | |
1318 | */ | |
6725fe19 | 1319 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 1320 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
1321 | if (elist == NULL) { |
1322 | PERROR("alloc list events"); | |
1323 | count = -ENOMEM; | |
1324 | goto end; | |
1325 | } | |
2ef84c95 | 1326 | |
53efb85a | 1327 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1328 | if (count >= nbmem) { |
3b870559 | 1329 | struct lttng_event *new_elist; |
53efb85a | 1330 | size_t new_nbmem; |
3b870559 | 1331 | |
53efb85a MD |
1332 | new_nbmem = nbmem << 1; |
1333 | DBG("Reallocating event list from %zu to %zu bytes", | |
1334 | nbmem, new_nbmem); | |
1335 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 1336 | if (new_elist == NULL) { |
df0f840b | 1337 | PERROR("realloc list events"); |
3b870559 MD |
1338 | free(event); |
1339 | free(elist); | |
61b73b12 MD |
1340 | count = -ENOMEM; |
1341 | goto end; | |
2ef84c95 | 1342 | } |
53efb85a MD |
1343 | /* Zero the new memory */ |
1344 | memset(new_elist + nbmem, 0, | |
1345 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
1346 | nbmem = new_nbmem; | |
3b870559 | 1347 | elist = new_elist; |
2ef84c95 | 1348 | } |
99497cd0 MD |
1349 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1350 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1351 | elist[count].enabled = -1; |
9f19cc17 | 1352 | count++; |
3b870559 | 1353 | free(event); |
2ef84c95 DG |
1354 | } |
1355 | ||
9f19cc17 | 1356 | *events = elist; |
ced2f820 | 1357 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1358 | end: |
799e2c4f MD |
1359 | ret = fclose(fp); /* closes both fp and fd */ |
1360 | if (ret) { | |
1361 | PERROR("fclose"); | |
1362 | } | |
9f19cc17 | 1363 | return count; |
2ef84c95 | 1364 | |
61b73b12 | 1365 | error_fp: |
799e2c4f MD |
1366 | ret = close(fd); |
1367 | if (ret) { | |
1368 | PERROR("close"); | |
1369 | } | |
2ef84c95 DG |
1370 | error: |
1371 | return -1; | |
1372 | } | |
096102bd DG |
1373 | |
1374 | /* | |
1375 | * Get kernel version and validate it. | |
1376 | */ | |
7d268848 | 1377 | int kernel_validate_version(struct lttng_kernel_tracer_version *version, |
88076e89 | 1378 | struct lttng_kernel_tracer_abi_version *abi_version) |
096102bd DG |
1379 | { |
1380 | int ret; | |
096102bd | 1381 | |
7d268848 | 1382 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1383 | if (ret < 0) { |
521dd134 | 1384 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1385 | goto error; |
1386 | } | |
1387 | ||
1388 | /* Validate version */ | |
88076e89 | 1389 | if (version->major != VERSION_MAJOR) { |
c052142c | 1390 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 1391 | version->major, VERSION_MAJOR); |
096102bd | 1392 | goto error_version; |
096102bd | 1393 | } |
7d268848 | 1394 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1395 | if (ret < 0) { |
521dd134 | 1396 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1397 | goto error; |
1398 | } | |
88076e89 | 1399 | if (abi_version->major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
521dd134 | 1400 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 1401 | abi_version->major, abi_version->minor, |
c052142c MD |
1402 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
1403 | goto error; | |
1404 | } | |
1405 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
1406 | version->major, version->minor, |
1407 | abi_version->major, abi_version->minor); | |
096102bd DG |
1408 | return 0; |
1409 | ||
1410 | error_version: | |
096102bd DG |
1411 | ret = -1; |
1412 | ||
1413 | error: | |
521dd134 | 1414 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1415 | return ret; |
1416 | } | |
335a95b7 MD |
1417 | |
1418 | /* | |
1419 | * Kernel work-arounds called at the start of sessiond main(). | |
1420 | */ | |
1421 | int init_kernel_workarounds(void) | |
1422 | { | |
8936c33a | 1423 | int ret; |
335a95b7 MD |
1424 | FILE *fp; |
1425 | ||
1426 | /* | |
1427 | * boot_id needs to be read once before being used concurrently | |
1428 | * to deal with a Linux kernel race. A fix is proposed for | |
1429 | * upstream, but the work-around is needed for older kernels. | |
1430 | */ | |
1431 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1432 | if (!fp) { | |
1433 | goto end_boot_id; | |
1434 | } | |
1435 | while (!feof(fp)) { | |
1436 | char buf[37] = ""; | |
1437 | ||
8936c33a DG |
1438 | ret = fread(buf, 1, sizeof(buf), fp); |
1439 | if (ret < 0) { | |
1440 | /* Ignore error, we don't really care */ | |
1441 | } | |
335a95b7 | 1442 | } |
799e2c4f MD |
1443 | ret = fclose(fp); |
1444 | if (ret) { | |
1445 | PERROR("fclose"); | |
1446 | } | |
335a95b7 | 1447 | end_boot_id: |
335a95b7 MD |
1448 | return 0; |
1449 | } | |
2f77fc4b DG |
1450 | |
1451 | /* | |
d070c424 | 1452 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1453 | */ |
1454 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1455 | { | |
82b69413 JG |
1456 | struct lttng_trace_chunk *trace_chunk; |
1457 | ||
2f77fc4b DG |
1458 | if (ksess == NULL) { |
1459 | DBG3("No kernel session when tearing down session"); | |
1460 | return; | |
1461 | } | |
1462 | ||
1463 | DBG("Tearing down kernel session"); | |
82b69413 | 1464 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1465 | |
07b86b52 | 1466 | /* |
15dc512a DG |
1467 | * Destroy channels on the consumer if at least one FD has been sent and we |
1468 | * are in no output mode because the streams are in *no* monitor mode so we | |
1469 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1470 | */ |
15dc512a | 1471 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1472 | int ret; |
1473 | struct consumer_socket *socket; | |
1474 | struct lttng_ht_iter iter; | |
1475 | ||
1476 | /* For each consumer socket. */ | |
d069d577 | 1477 | rcu_read_lock(); |
07b86b52 JD |
1478 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1479 | socket, node.node) { | |
1480 | struct ltt_kernel_channel *chan; | |
1481 | ||
1482 | /* For each channel, ask the consumer to destroy it. */ | |
1483 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1484 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1485 | if (ret < 0) { | |
1486 | /* Consumer is probably dead. Use next socket. */ | |
1487 | continue; | |
1488 | } | |
1489 | } | |
1490 | } | |
d069d577 | 1491 | rcu_read_unlock(); |
07b86b52 JD |
1492 | } |
1493 | ||
2f77fc4b DG |
1494 | /* Close any relayd session */ |
1495 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1496 | ||
1497 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1498 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1499 | } |
fb5f35b6 | 1500 | |
d070c424 MD |
1501 | /* Teardown of data required by destroy notifiers. */ |
1502 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1503 | { | |
1504 | if (ksess == NULL) { | |
1505 | return; | |
1506 | } | |
1507 | trace_kernel_free_session(ksess); | |
1508 | } | |
1509 | ||
fb5f35b6 DG |
1510 | /* |
1511 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1512 | */ | |
1513 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1514 | { | |
1515 | struct ltt_kernel_session *ksess = NULL; | |
1516 | ||
1517 | assert(kchan); | |
1518 | assert(kchan->channel); | |
1519 | ||
1520 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1521 | ||
1522 | /* Update channel count of associated session. */ | |
1523 | if (kchan->session) { | |
1524 | /* Keep pointer reference so we can update it after the destroy. */ | |
1525 | ksess = kchan->session; | |
1526 | } | |
1527 | ||
1528 | trace_kernel_destroy_channel(kchan); | |
1529 | ||
1530 | /* | |
1531 | * At this point the kernel channel is not visible anymore. This is safe | |
1532 | * since in order to work on a visible kernel session, the tracing session | |
1533 | * lock (ltt_session.lock) MUST be acquired. | |
1534 | */ | |
1535 | if (ksess) { | |
1536 | ksess->channel_count--; | |
1537 | } | |
1538 | } | |
6dc3064a DG |
1539 | |
1540 | /* | |
1541 | * Take a snapshot for a given kernel session. | |
1542 | * | |
9a654598 | 1543 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1544 | */ |
fb9a95c4 JG |
1545 | enum lttng_error_code kernel_snapshot_record( |
1546 | struct ltt_kernel_session *ksess, | |
348a81dc | 1547 | const struct consumer_output *output, int wait, |
d07ceecd | 1548 | uint64_t nb_packets_per_stream) |
6dc3064a | 1549 | { |
2a06df8d | 1550 | int err, ret, saved_metadata_fd; |
9a654598 | 1551 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1552 | struct consumer_socket *socket; |
1553 | struct lttng_ht_iter iter; | |
1554 | struct ltt_kernel_metadata *saved_metadata; | |
3b967712 | 1555 | char *trace_path = NULL; |
5da88b0f | 1556 | size_t consumer_path_offset = 0; |
6dc3064a DG |
1557 | |
1558 | assert(ksess); | |
1559 | assert(ksess->consumer); | |
1560 | assert(output); | |
1561 | ||
1562 | DBG("Kernel snapshot record started"); | |
1563 | ||
1564 | /* Save current metadata since the following calls will change it. */ | |
1565 | saved_metadata = ksess->metadata; | |
1566 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1567 | ||
1568 | rcu_read_lock(); | |
1569 | ||
1570 | ret = kernel_open_metadata(ksess); | |
1571 | if (ret < 0) { | |
9a654598 | 1572 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1573 | goto error; |
1574 | } | |
1575 | ||
1576 | ret = kernel_open_metadata_stream(ksess); | |
1577 | if (ret < 0) { | |
9a654598 | 1578 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1579 | goto error_open_stream; |
1580 | } | |
1581 | ||
3b967712 | 1582 | trace_path = setup_channel_trace_path(ksess->consumer, |
06da8843 | 1583 | "", &consumer_path_offset); |
3b967712 MD |
1584 | if (!trace_path) { |
1585 | status = LTTNG_ERR_INVALID; | |
1586 | goto error; | |
1587 | } | |
6dc3064a | 1588 | /* Send metadata to consumer and snapshot everything. */ |
348a81dc | 1589 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
6dc3064a | 1590 | socket, node.node) { |
6dc3064a | 1591 | struct ltt_kernel_channel *chan; |
6dc3064a | 1592 | |
6dc3064a DG |
1593 | pthread_mutex_lock(socket->lock); |
1594 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1595 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1596 | pthread_mutex_unlock(socket->lock); |
6dc3064a | 1597 | if (ret < 0) { |
0ed78e50 | 1598 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1599 | goto error_consumer; |
1600 | } | |
1601 | ||
1602 | /* For each channel, ask the consumer to snapshot it. */ | |
1603 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
9a654598 | 1604 | status = consumer_snapshot_channel(socket, chan->key, output, 0, |
5c786ded | 1605 | ksess->uid, ksess->gid, |
5da88b0f | 1606 | &trace_path[consumer_path_offset], wait, |
d2956687 | 1607 | nb_packets_per_stream); |
9a654598 | 1608 | if (status != LTTNG_OK) { |
2a06df8d DG |
1609 | (void) kernel_consumer_destroy_metadata(socket, |
1610 | ksess->metadata); | |
6dc3064a DG |
1611 | goto error_consumer; |
1612 | } | |
1613 | } | |
1614 | ||
1615 | /* Snapshot metadata, */ | |
9a654598 | 1616 | status = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
5da88b0f MD |
1617 | 1, ksess->uid, ksess->gid, &trace_path[consumer_path_offset], |
1618 | wait, 0); | |
9a654598 | 1619 | if (status != LTTNG_OK) { |
6dc3064a DG |
1620 | goto error_consumer; |
1621 | } | |
07b86b52 JD |
1622 | |
1623 | /* | |
1624 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1625 | * it's not monitored on the consumer side. | |
1626 | */ | |
1627 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1628 | } |
1629 | ||
1630 | error_consumer: | |
1631 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1632 | err = close(ksess->metadata_stream_fd); |
1633 | if (err < 0) { | |
6dc3064a DG |
1634 | PERROR("close snapshot kernel"); |
1635 | } | |
1636 | ||
1637 | error_open_stream: | |
1638 | trace_kernel_destroy_metadata(ksess->metadata); | |
1639 | error: | |
1640 | /* Restore metadata state.*/ | |
1641 | ksess->metadata = saved_metadata; | |
1642 | ksess->metadata_stream_fd = saved_metadata_fd; | |
6dc3064a | 1643 | rcu_read_unlock(); |
3b967712 | 1644 | free(trace_path); |
9a654598 | 1645 | return status; |
6dc3064a | 1646 | } |
834978fd DG |
1647 | |
1648 | /* | |
1649 | * Get the syscall mask array from the kernel tracer. | |
1650 | * | |
1651 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1652 | * be freed. | |
1653 | */ | |
1654 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1655 | { | |
1656 | assert(syscall_mask); | |
1657 | assert(nr_bits); | |
1658 | ||
1659 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1660 | } | |
6e21424e JR |
1661 | |
1662 | /* | |
1663 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1664 | * version number. | |
1665 | * | |
1666 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1667 | * of errors. | |
1668 | */ | |
7d268848 | 1669 | int kernel_supports_ring_buffer_snapshot_sample_positions(void) |
6e21424e JR |
1670 | { |
1671 | int ret = 0; // Not supported by default | |
1672 | struct lttng_kernel_tracer_abi_version abi; | |
1673 | ||
7d268848 | 1674 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1675 | if (ret < 0) { |
1676 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1677 | goto error; | |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1682 | */ | |
1683 | if (abi.major >= 2 && abi.minor >= 3) { | |
1684 | /* Supported */ | |
1685 | ret = 1; | |
1686 | } else { | |
1687 | /* Not supported */ | |
1688 | ret = 0; | |
1689 | } | |
1690 | error: | |
1691 | return ret; | |
1692 | } | |
5c408ad8 | 1693 | |
a40a503f MD |
1694 | /* |
1695 | * Check for the support of the packet sequence number via abi version number. | |
1696 | * | |
1697 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1698 | * of errors. | |
1699 | */ | |
1700 | int kernel_supports_ring_buffer_packet_sequence_number(void) | |
1701 | { | |
1702 | int ret = 0; // Not supported by default | |
1703 | struct lttng_kernel_tracer_abi_version abi; | |
1704 | ||
1705 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); | |
1706 | if (ret < 0) { | |
1707 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1708 | goto error; | |
1709 | } | |
1710 | ||
1711 | /* | |
3029bc92 JG |
1712 | * Packet sequence number was introduced in LTTng 2.8, |
1713 | * lttng-modules ABI 2.1. | |
a40a503f | 1714 | */ |
3029bc92 | 1715 | if (abi.major >= 2 && abi.minor >= 1) { |
a40a503f MD |
1716 | /* Supported */ |
1717 | ret = 1; | |
1718 | } else { | |
1719 | /* Not supported */ | |
1720 | ret = 0; | |
1721 | } | |
1722 | error: | |
1723 | return ret; | |
1724 | } | |
1725 | ||
5c408ad8 JD |
1726 | /* |
1727 | * Rotate a kernel session. | |
1728 | * | |
d5a1b7aa | 1729 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1730 | */ |
d5a1b7aa | 1731 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1732 | { |
1733 | int ret; | |
d5a1b7aa | 1734 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1735 | struct consumer_socket *socket; |
1736 | struct lttng_ht_iter iter; | |
1737 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1738 | ||
1739 | assert(ksess); | |
1740 | assert(ksess->consumer); | |
1741 | ||
1742 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1743 | session->name, session->id); | |
1744 | ||
1745 | rcu_read_lock(); | |
1746 | ||
1747 | /* | |
1748 | * Note that this loop will end after one iteration given that there is | |
1749 | * only one kernel consumer. | |
1750 | */ | |
1751 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1752 | socket, node.node) { | |
1753 | struct ltt_kernel_channel *chan; | |
1754 | ||
d2956687 | 1755 | /* For each channel, ask the consumer to rotate it. */ |
5c408ad8 | 1756 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
92816cc3 JG |
1757 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
1758 | chan->key, session->name); | |
5c408ad8 JD |
1759 | ret = consumer_rotate_channel(socket, chan->key, |
1760 | ksess->uid, ksess->gid, ksess->consumer, | |
d2956687 | 1761 | /* is_metadata_channel */ false); |
5c408ad8 | 1762 | if (ret < 0) { |
4d074167 | 1763 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1764 | goto error; |
1765 | } | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * Rotate the metadata channel. | |
1770 | */ | |
22a1b931 | 1771 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
5c408ad8 | 1772 | ksess->uid, ksess->gid, ksess->consumer, |
d2956687 | 1773 | /* is_metadata_channel */ true); |
5c408ad8 | 1774 | if (ret < 0) { |
4d074167 | 1775 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1776 | goto error; |
1777 | } | |
1778 | } | |
1779 | ||
5c408ad8 JD |
1780 | error: |
1781 | rcu_read_unlock(); | |
d5a1b7aa | 1782 | return status; |
5c408ad8 | 1783 | } |
d2956687 JG |
1784 | |
1785 | enum lttng_error_code kernel_create_channel_subdirectories( | |
1786 | const struct ltt_kernel_session *ksess) | |
1787 | { | |
1788 | enum lttng_error_code ret = LTTNG_OK; | |
1789 | enum lttng_trace_chunk_status chunk_status; | |
1790 | ||
1791 | rcu_read_lock(); | |
1792 | assert(ksess->current_trace_chunk); | |
1793 | ||
1794 | /* | |
1795 | * Create the index subdirectory which will take care | |
1796 | * of implicitly creating the channel's path. | |
1797 | */ | |
1798 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
1799 | ksess->current_trace_chunk, | |
1800 | DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); | |
1801 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1802 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1803 | goto error; | |
1804 | } | |
1805 | error: | |
1806 | rcu_read_unlock(); | |
1807 | return ret; | |
1808 | } | |
7d268848 MD |
1809 | |
1810 | /* | |
1811 | * Setup necessary data for kernel tracer action. | |
1812 | */ | |
1813 | LTTNG_HIDDEN | |
1814 | int init_kernel_tracer(void) | |
1815 | { | |
1816 | int ret; | |
1817 | bool is_root = !getuid(); | |
1818 | ||
1819 | /* Modprobe lttng kernel modules */ | |
1820 | ret = modprobe_lttng_control(); | |
1821 | if (ret < 0) { | |
1822 | goto error; | |
1823 | } | |
1824 | ||
1825 | /* Open debugfs lttng */ | |
1826 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1827 | if (kernel_tracer_fd < 0) { | |
1828 | DBG("Failed to open %s", module_proc_lttng); | |
1829 | goto error_open; | |
1830 | } | |
1831 | ||
1832 | /* Validate kernel version */ | |
1833 | ret = kernel_validate_version(&kernel_tracer_version, | |
1834 | &kernel_tracer_abi_version); | |
1835 | if (ret < 0) { | |
1836 | goto error_version; | |
1837 | } | |
1838 | ||
1839 | ret = modprobe_lttng_data(); | |
1840 | if (ret < 0) { | |
1841 | goto error_modules; | |
1842 | } | |
1843 | ||
1844 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1845 | if (ret < 0) { | |
1846 | goto error_modules; | |
1847 | } | |
1848 | ||
1849 | if (ret < 1) { | |
1850 | WARN("Kernel tracer does not support buffer monitoring. " | |
1851 | "The monitoring timer of channels in the kernel domain " | |
1852 | "will be set to 0 (disabled)."); | |
1853 | } | |
1854 | ||
1855 | DBG("Kernel tracer fd %d", kernel_tracer_fd); | |
1856 | ||
1857 | ret = syscall_init_table(kernel_tracer_fd); | |
1858 | if (ret < 0) { | |
1859 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
1860 | "work for this session daemon."); | |
1861 | } | |
1862 | return 0; | |
1863 | ||
1864 | error_version: | |
1865 | modprobe_remove_lttng_control(); | |
1866 | ret = close(kernel_tracer_fd); | |
1867 | if (ret) { | |
1868 | PERROR("close"); | |
1869 | } | |
1870 | kernel_tracer_fd = -1; | |
1871 | return LTTNG_ERR_KERN_VERSION; | |
1872 | ||
1873 | error_modules: | |
1874 | ret = close(kernel_tracer_fd); | |
1875 | if (ret) { | |
1876 | PERROR("close"); | |
1877 | } | |
1878 | ||
1879 | error_open: | |
1880 | modprobe_remove_lttng_control(); | |
1881 | ||
1882 | error: | |
1883 | WARN("No kernel tracer available"); | |
1884 | kernel_tracer_fd = -1; | |
1885 | if (!is_root) { | |
1886 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1887 | } else { | |
1888 | return LTTNG_ERR_KERN_NA; | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | LTTNG_HIDDEN | |
1893 | void cleanup_kernel_tracer(void) | |
1894 | { | |
1895 | int ret; | |
1896 | ||
1897 | DBG2("Closing kernel fd"); | |
1898 | if (kernel_tracer_fd >= 0) { | |
1899 | ret = close(kernel_tracer_fd); | |
1900 | if (ret) { | |
1901 | PERROR("close"); | |
1902 | } | |
1903 | kernel_tracer_fd = -1; | |
1904 | } | |
1905 | DBG("Unloading kernel modules"); | |
1906 | modprobe_remove_lttng_all(); | |
1907 | free(syscall_table); | |
1908 | } | |
1909 | ||
1910 | LTTNG_HIDDEN | |
1911 | bool kernel_tracer_is_initialized(void) | |
1912 | { | |
1913 | return kernel_tracer_fd >= 0; | |
1914 | } | |
bca212a2 MD |
1915 | |
1916 | /* | |
1917 | * Clear a kernel session. | |
1918 | * | |
1919 | * Return LTTNG_OK on success or else an LTTng error code. | |
1920 | */ | |
1921 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
1922 | { | |
1923 | int ret; | |
1924 | enum lttng_error_code status = LTTNG_OK; | |
1925 | struct consumer_socket *socket; | |
1926 | struct lttng_ht_iter iter; | |
1927 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1928 | ||
1929 | assert(ksess); | |
1930 | assert(ksess->consumer); | |
1931 | ||
1932 | DBG("Clear kernel session %s (session %" PRIu64 ")", | |
1933 | session->name, session->id); | |
1934 | ||
1935 | rcu_read_lock(); | |
1936 | ||
1937 | if (ksess->active) { | |
1938 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
1939 | status = LTTNG_ERR_FATAL; | |
1940 | goto end; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * Note that this loop will end after one iteration given that there is | |
1945 | * only one kernel consumer. | |
1946 | */ | |
1947 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1948 | socket, node.node) { | |
1949 | struct ltt_kernel_channel *chan; | |
1950 | ||
1951 | /* For each channel, ask the consumer to clear it. */ | |
1952 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1953 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
1954 | chan->key, session->name); | |
1955 | ret = consumer_clear_channel(socket, chan->key); | |
1956 | if (ret < 0) { | |
1957 | goto error; | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | if (!ksess->metadata) { | |
1962 | /* | |
1963 | * Nothing to do for the metadata. | |
1964 | * This is a snapshot session. | |
1965 | * The metadata is genererated on the fly. | |
1966 | */ | |
1967 | continue; | |
1968 | } | |
1969 | ||
1970 | /* | |
1971 | * Clear the metadata channel. | |
1972 | * Metadata channel is not cleared per se but we still need to | |
1973 | * perform a rotation operation on it behind the scene. | |
1974 | */ | |
1975 | ret = consumer_clear_channel(socket, ksess->metadata->key); | |
1976 | if (ret < 0) { | |
1977 | goto error; | |
1978 | } | |
1979 | } | |
1980 | ||
1981 | goto end; | |
1982 | error: | |
1983 | switch (-ret) { | |
1984 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
1985 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
1986 | break; | |
1987 | default: | |
1988 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
1989 | break; | |
1990 | } | |
1991 | end: | |
1992 | rcu_read_unlock(); | |
1993 | return status; | |
1994 | } |