Commit | Line | Data |
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d0b96690 DG |
1 | /* |
2 | * ust-metadata.c | |
3 | * | |
4 | * LTTng-UST metadata generation | |
5 | * | |
6 | * Copyright (C) 2010-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License, version 2 only, | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
22 | #define _GNU_SOURCE | |
6c1c0768 | 23 | #define _LGPL_SOURCE |
d0b96690 DG |
24 | #include <stdint.h> |
25 | #include <string.h> | |
26 | #include <stdarg.h> | |
27 | #include <stdio.h> | |
28 | #include <limits.h> | |
29 | #include <unistd.h> | |
30 | #include <inttypes.h> | |
31 | #include <common/common.h> | |
32 | ||
33 | #include "ust-registry.h" | |
34 | #include "ust-clock.h" | |
35 | #include "ust-app.h" | |
36 | ||
37 | #ifndef max_t | |
38 | #define max_t(type, a, b) ((type) ((a) > (b) ? (a) : (b))) | |
39 | #endif | |
40 | ||
8c645bb0 MD |
41 | #define NR_CLOCK_OFFSET_SAMPLES 10 |
42 | ||
43 | struct offset_sample { | |
44 | uint64_t offset; /* correlation offset */ | |
45 | uint64_t measure_delta; /* lower is better */ | |
46 | }; | |
47 | ||
d0b96690 DG |
48 | static inline |
49 | int fls(unsigned int x) | |
50 | { | |
51 | int r = 32; | |
52 | ||
53 | if (!x) | |
54 | return 0; | |
55 | if (!(x & 0xFFFF0000U)) { | |
56 | x <<= 16; | |
57 | r -= 16; | |
58 | } | |
59 | if (!(x & 0xFF000000U)) { | |
60 | x <<= 8; | |
61 | r -= 8; | |
62 | } | |
63 | if (!(x & 0xF0000000U)) { | |
64 | x <<= 4; | |
65 | r -= 4; | |
66 | } | |
67 | if (!(x & 0xC0000000U)) { | |
68 | x <<= 2; | |
69 | r -= 2; | |
70 | } | |
71 | if (!(x & 0x80000000U)) { | |
72 | x <<= 1; | |
73 | r -= 1; | |
74 | } | |
75 | return r; | |
76 | } | |
77 | ||
78 | static inline | |
79 | int get_count_order(unsigned int count) | |
80 | { | |
81 | int order; | |
82 | ||
83 | order = fls(count) - 1; | |
84 | if (count & (count - 1)) | |
85 | order++; | |
86 | return order; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Returns offset where to write in metadata array, or negative error value on error. | |
91 | */ | |
92 | static | |
93 | ssize_t metadata_reserve(struct ust_registry_session *session, size_t len) | |
94 | { | |
95 | size_t new_len = session->metadata_len + len; | |
96 | size_t new_alloc_len = new_len; | |
97 | size_t old_alloc_len = session->metadata_alloc_len; | |
98 | ssize_t ret; | |
99 | ||
100 | if (new_alloc_len > (UINT32_MAX >> 1)) | |
101 | return -EINVAL; | |
102 | if ((old_alloc_len << 1) > (UINT32_MAX >> 1)) | |
103 | return -EINVAL; | |
104 | ||
105 | if (new_alloc_len > old_alloc_len) { | |
106 | char *newptr; | |
107 | ||
108 | new_alloc_len = | |
109 | max_t(size_t, 1U << get_count_order(new_alloc_len), old_alloc_len << 1); | |
110 | newptr = realloc(session->metadata, new_alloc_len); | |
111 | if (!newptr) | |
112 | return -ENOMEM; | |
113 | session->metadata = newptr; | |
114 | /* We zero directly the memory from start of allocation. */ | |
115 | memset(&session->metadata[old_alloc_len], 0, new_alloc_len - old_alloc_len); | |
116 | session->metadata_alloc_len = new_alloc_len; | |
117 | } | |
118 | ret = session->metadata_len; | |
119 | session->metadata_len += len; | |
120 | return ret; | |
121 | } | |
122 | ||
123 | /* | |
124 | * We have exclusive access to our metadata buffer (protected by the | |
125 | * ust_lock), so we can do racy operations such as looking for | |
126 | * remaining space left in packet and write, since mutual exclusion | |
127 | * protects us from concurrent writes. | |
128 | */ | |
129 | static | |
130 | int lttng_metadata_printf(struct ust_registry_session *session, | |
131 | const char *fmt, ...) | |
132 | { | |
133 | char *str = NULL; | |
134 | size_t len; | |
135 | va_list ap; | |
136 | ssize_t offset; | |
137 | int ret; | |
138 | ||
139 | va_start(ap, fmt); | |
140 | ret = vasprintf(&str, fmt, ap); | |
141 | va_end(ap); | |
142 | if (ret < 0) | |
143 | return -ENOMEM; | |
144 | ||
145 | len = strlen(str); | |
146 | offset = metadata_reserve(session, len); | |
147 | if (offset < 0) { | |
148 | ret = offset; | |
149 | goto end; | |
150 | } | |
151 | memcpy(&session->metadata[offset], str, len); | |
152 | DBG3("Append to metadata: \"%s\"", str); | |
153 | ret = 0; | |
154 | ||
155 | end: | |
156 | free(str); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static | |
161 | int _lttng_field_statedump(struct ust_registry_session *session, | |
162 | const struct ustctl_field *field) | |
163 | { | |
164 | int ret = 0; | |
165 | const char *bo_be = " byte_order = be;"; | |
166 | const char *bo_le = " byte_order = le;"; | |
167 | const char *bo_native = ""; | |
168 | const char *bo_reverse; | |
169 | ||
170 | if (session->byte_order == BIG_ENDIAN) | |
171 | bo_reverse = bo_le; | |
172 | else | |
173 | bo_reverse = bo_be; | |
174 | ||
175 | switch (field->type.atype) { | |
176 | case ustctl_atype_integer: | |
177 | ret = lttng_metadata_printf(session, | |
178 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", | |
179 | field->type.u.basic.integer.size, | |
180 | field->type.u.basic.integer.alignment, | |
181 | field->type.u.basic.integer.signedness, | |
182 | (field->type.u.basic.integer.encoding == ustctl_encode_none) | |
183 | ? "none" | |
184 | : (field->type.u.basic.integer.encoding == ustctl_encode_UTF8) | |
185 | ? "UTF8" | |
186 | : "ASCII", | |
187 | field->type.u.basic.integer.base, | |
188 | field->type.u.basic.integer.reverse_byte_order ? bo_reverse : bo_native, | |
189 | field->name); | |
190 | break; | |
191 | case ustctl_atype_float: | |
192 | ret = lttng_metadata_printf(session, | |
193 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", | |
194 | field->type.u.basic._float.exp_dig, | |
195 | field->type.u.basic._float.mant_dig, | |
196 | field->type.u.basic._float.alignment, | |
197 | field->type.u.basic.integer.reverse_byte_order ? bo_reverse : bo_native, | |
198 | field->name); | |
199 | break; | |
200 | case ustctl_atype_enum: | |
201 | return -EINVAL; | |
202 | case ustctl_atype_array: | |
203 | { | |
204 | const struct ustctl_basic_type *elem_type; | |
205 | ||
206 | elem_type = &field->type.u.array.elem_type; | |
207 | ret = lttng_metadata_printf(session, | |
208 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", | |
209 | elem_type->u.basic.integer.size, | |
210 | elem_type->u.basic.integer.alignment, | |
211 | elem_type->u.basic.integer.signedness, | |
212 | (elem_type->u.basic.integer.encoding == ustctl_encode_none) | |
213 | ? "none" | |
214 | : (elem_type->u.basic.integer.encoding == ustctl_encode_UTF8) | |
215 | ? "UTF8" | |
216 | : "ASCII", | |
217 | elem_type->u.basic.integer.base, | |
218 | elem_type->u.basic.integer.reverse_byte_order ? bo_reverse : bo_native, | |
219 | field->name, field->type.u.array.length); | |
220 | break; | |
221 | } | |
222 | case ustctl_atype_sequence: | |
223 | { | |
224 | const struct ustctl_basic_type *elem_type; | |
225 | const struct ustctl_basic_type *length_type; | |
226 | ||
227 | elem_type = &field->type.u.sequence.elem_type; | |
228 | length_type = &field->type.u.sequence.length_type; | |
229 | ret = lttng_metadata_printf(session, | |
230 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
231 | length_type->u.basic.integer.size, | |
232 | (unsigned int) length_type->u.basic.integer.alignment, | |
233 | length_type->u.basic.integer.signedness, | |
234 | (length_type->u.basic.integer.encoding == ustctl_encode_none) | |
235 | ? "none" | |
236 | : ((length_type->u.basic.integer.encoding == ustctl_encode_UTF8) | |
237 | ? "UTF8" | |
238 | : "ASCII"), | |
239 | length_type->u.basic.integer.base, | |
240 | length_type->u.basic.integer.reverse_byte_order ? bo_reverse : bo_native, | |
241 | field->name); | |
242 | if (ret) | |
243 | return ret; | |
244 | ||
245 | ret = lttng_metadata_printf(session, | |
246 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", | |
247 | elem_type->u.basic.integer.size, | |
248 | (unsigned int) elem_type->u.basic.integer.alignment, | |
249 | elem_type->u.basic.integer.signedness, | |
250 | (elem_type->u.basic.integer.encoding == ustctl_encode_none) | |
251 | ? "none" | |
252 | : ((elem_type->u.basic.integer.encoding == ustctl_encode_UTF8) | |
253 | ? "UTF8" | |
254 | : "ASCII"), | |
255 | elem_type->u.basic.integer.base, | |
256 | elem_type->u.basic.integer.reverse_byte_order ? bo_reverse : bo_native, | |
257 | field->name, | |
258 | field->name); | |
259 | break; | |
260 | } | |
261 | ||
262 | case ustctl_atype_string: | |
263 | /* Default encoding is UTF8 */ | |
264 | ret = lttng_metadata_printf(session, | |
265 | " string%s _%s;\n", | |
266 | field->type.u.basic.string.encoding == ustctl_encode_ASCII ? | |
267 | " { encoding = ASCII; }" : "", | |
268 | field->name); | |
269 | break; | |
270 | default: | |
271 | return -EINVAL; | |
272 | } | |
273 | return ret; | |
274 | } | |
275 | ||
276 | static | |
277 | int _lttng_context_metadata_statedump(struct ust_registry_session *session, | |
278 | size_t nr_ctx_fields, | |
279 | struct ustctl_field *ctx) | |
280 | { | |
281 | int ret = 0; | |
282 | int i; | |
283 | ||
284 | if (!ctx) | |
285 | return 0; | |
286 | for (i = 0; i < nr_ctx_fields; i++) { | |
287 | const struct ustctl_field *field = &ctx[i]; | |
288 | ||
289 | ret = _lttng_field_statedump(session, field); | |
290 | if (ret) | |
291 | return ret; | |
292 | } | |
293 | return ret; | |
294 | } | |
295 | ||
296 | static | |
297 | int _lttng_fields_metadata_statedump(struct ust_registry_session *session, | |
298 | struct ust_registry_event *event) | |
299 | { | |
300 | int ret = 0; | |
301 | int i; | |
302 | ||
303 | for (i = 0; i < event->nr_fields; i++) { | |
304 | const struct ustctl_field *field = &event->fields[i]; | |
305 | ||
306 | ret = _lttng_field_statedump(session, field); | |
307 | if (ret) | |
308 | return ret; | |
309 | } | |
310 | return ret; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Should be called with session registry mutex held. | |
315 | */ | |
316 | int ust_metadata_event_statedump(struct ust_registry_session *session, | |
317 | struct ust_registry_channel *chan, | |
318 | struct ust_registry_event *event) | |
319 | { | |
320 | int ret = 0; | |
321 | ||
322 | /* Don't dump metadata events */ | |
323 | if (chan->chan_id == -1U) | |
324 | return 0; | |
325 | ||
326 | ret = lttng_metadata_printf(session, | |
327 | "event {\n" | |
328 | " name = \"%s\";\n" | |
329 | " id = %u;\n" | |
330 | " stream_id = %u;\n", | |
331 | event->name, | |
332 | event->id, | |
333 | chan->chan_id); | |
334 | if (ret) | |
335 | goto end; | |
336 | ||
337 | ret = lttng_metadata_printf(session, | |
338 | " loglevel = %d;\n", | |
339 | event->loglevel); | |
340 | if (ret) | |
341 | goto end; | |
342 | ||
343 | if (event->model_emf_uri) { | |
344 | ret = lttng_metadata_printf(session, | |
345 | " model.emf.uri = \"%s\";\n", | |
346 | event->model_emf_uri); | |
347 | if (ret) | |
348 | goto end; | |
349 | } | |
350 | ||
351 | #if 0 /* context for events not supported */ | |
352 | if (event->ctx) { | |
353 | ret = lttng_metadata_printf(session, | |
354 | " context := struct {\n"); | |
355 | if (ret) | |
356 | goto end; | |
357 | } | |
358 | ret = _lttng_context_metadata_statedump(session, event->ctx); | |
359 | if (ret) | |
360 | goto end; | |
361 | if (event->ctx) { | |
362 | ret = lttng_metadata_printf(session, | |
363 | " };\n"); | |
364 | if (ret) | |
365 | goto end; | |
366 | } | |
367 | #endif | |
368 | ret = lttng_metadata_printf(session, | |
369 | " fields := struct {\n" | |
370 | ); | |
371 | if (ret) | |
372 | goto end; | |
373 | ||
374 | ret = _lttng_fields_metadata_statedump(session, event); | |
375 | if (ret) | |
376 | goto end; | |
377 | ||
378 | ret = lttng_metadata_printf(session, | |
379 | " };\n" | |
380 | "};\n\n"); | |
381 | if (ret) | |
382 | goto end; | |
7972aab2 | 383 | event->metadata_dumped = 1; |
d0b96690 DG |
384 | |
385 | end: | |
386 | return ret; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Should be called with session registry mutex held. | |
391 | */ | |
392 | int ust_metadata_channel_statedump(struct ust_registry_session *session, | |
393 | struct ust_registry_channel *chan) | |
394 | { | |
395 | int ret = 0; | |
396 | ||
397 | /* Don't dump metadata events */ | |
398 | if (chan->chan_id == -1U) | |
399 | return 0; | |
400 | ||
401 | if (!chan->header_type) | |
402 | return -EINVAL; | |
403 | ||
404 | ret = lttng_metadata_printf(session, | |
405 | "stream {\n" | |
406 | " id = %u;\n" | |
407 | " event.header := %s;\n" | |
408 | " packet.context := struct packet_context;\n", | |
409 | chan->chan_id, | |
410 | chan->header_type == USTCTL_CHANNEL_HEADER_COMPACT ? | |
411 | "struct event_header_compact" : | |
412 | "struct event_header_large"); | |
413 | if (ret) | |
414 | goto end; | |
415 | ||
416 | if (chan->ctx_fields) { | |
417 | ret = lttng_metadata_printf(session, | |
418 | " event.context := struct {\n"); | |
419 | if (ret) | |
420 | goto end; | |
421 | } | |
422 | ret = _lttng_context_metadata_statedump(session, | |
423 | chan->nr_ctx_fields, | |
424 | chan->ctx_fields); | |
425 | if (ret) | |
426 | goto end; | |
427 | if (chan->ctx_fields) { | |
428 | ret = lttng_metadata_printf(session, | |
429 | " };\n"); | |
430 | if (ret) | |
431 | goto end; | |
432 | } | |
433 | ||
434 | ret = lttng_metadata_printf(session, | |
435 | "};\n\n"); | |
7972aab2 DG |
436 | /* Flag success of metadata dump. */ |
437 | chan->metadata_dumped = 1; | |
d0b96690 DG |
438 | |
439 | end: | |
440 | return ret; | |
441 | } | |
442 | ||
443 | static | |
444 | int _lttng_stream_packet_context_declare(struct ust_registry_session *session) | |
445 | { | |
446 | return lttng_metadata_printf(session, | |
447 | "struct packet_context {\n" | |
448 | " uint64_clock_monotonic_t timestamp_begin;\n" | |
449 | " uint64_clock_monotonic_t timestamp_end;\n" | |
450 | " uint64_t content_size;\n" | |
451 | " uint64_t packet_size;\n" | |
452 | " unsigned long events_discarded;\n" | |
453 | " uint32_t cpu_id;\n" | |
454 | "};\n\n" | |
455 | ); | |
456 | } | |
457 | ||
458 | /* | |
459 | * Compact header: | |
460 | * id: range: 0 - 30. | |
461 | * id 31 is reserved to indicate an extended header. | |
462 | * | |
463 | * Large header: | |
464 | * id: range: 0 - 65534. | |
465 | * id 65535 is reserved to indicate an extended header. | |
466 | */ | |
467 | static | |
468 | int _lttng_event_header_declare(struct ust_registry_session *session) | |
469 | { | |
470 | return lttng_metadata_printf(session, | |
471 | "struct event_header_compact {\n" | |
472 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
473 | " variant <id> {\n" | |
474 | " struct {\n" | |
475 | " uint27_clock_monotonic_t timestamp;\n" | |
476 | " } compact;\n" | |
477 | " struct {\n" | |
478 | " uint32_t id;\n" | |
479 | " uint64_clock_monotonic_t timestamp;\n" | |
480 | " } extended;\n" | |
481 | " } v;\n" | |
482 | "} align(%u);\n" | |
483 | "\n" | |
484 | "struct event_header_large {\n" | |
485 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
486 | " variant <id> {\n" | |
487 | " struct {\n" | |
488 | " uint32_clock_monotonic_t timestamp;\n" | |
489 | " } compact;\n" | |
490 | " struct {\n" | |
491 | " uint32_t id;\n" | |
492 | " uint64_clock_monotonic_t timestamp;\n" | |
493 | " } extended;\n" | |
494 | " } v;\n" | |
495 | "} align(%u);\n\n", | |
496 | session->uint32_t_alignment, | |
497 | session->uint16_t_alignment | |
498 | ); | |
499 | } | |
500 | ||
d0b96690 | 501 | static |
8c645bb0 | 502 | int measure_single_clock_offset(struct offset_sample *sample) |
d0b96690 | 503 | { |
8c645bb0 | 504 | uint64_t offset, monotonic[2], measure_delta, realtime; |
d0b96690 DG |
505 | struct timespec rts = { 0, 0 }; |
506 | int ret; | |
507 | ||
508 | monotonic[0] = trace_clock_read64(); | |
509 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
8c645bb0 MD |
510 | if (ret < 0) { |
511 | return ret; | |
512 | } | |
d0b96690 | 513 | monotonic[1] = trace_clock_read64(); |
8c645bb0 MD |
514 | measure_delta = monotonic[1] - monotonic[0]; |
515 | if (measure_delta > sample->measure_delta) { | |
516 | /* | |
517 | * Discard value if it took longer to read than the best | |
518 | * sample so far. | |
519 | */ | |
520 | return 0; | |
521 | } | |
d0b96690 DG |
522 | offset = (monotonic[0] + monotonic[1]) >> 1; |
523 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; | |
524 | realtime += rts.tv_nsec; | |
525 | offset = realtime - offset; | |
8c645bb0 MD |
526 | sample->offset = offset; |
527 | sample->measure_delta = measure_delta; | |
528 | return 0; | |
d0b96690 DG |
529 | } |
530 | ||
8c645bb0 MD |
531 | /* |
532 | * Approximation of NTP time of day to clock monotonic correlation, | |
533 | * taken at start of trace. Keep the measurement that took the less time | |
534 | * to complete, thus removing imprecision caused by preemption. | |
535 | */ | |
536 | static | |
537 | uint64_t measure_clock_offset(void) | |
538 | { | |
539 | int i; | |
540 | struct offset_sample offset_best_sample = { | |
541 | .offset = 0, | |
542 | .measure_delta = UINT64_MAX, | |
543 | }; | |
544 | ||
545 | for (i = 0; i < NR_CLOCK_OFFSET_SAMPLES; i++) { | |
546 | if (measure_single_clock_offset(&offset_best_sample)) { | |
547 | return 0; | |
548 | } | |
549 | } | |
550 | return offset_best_sample.offset; | |
551 | } | |
d0b96690 DG |
552 | |
553 | /* | |
554 | * Should be called with session registry mutex held. | |
555 | */ | |
556 | int ust_metadata_session_statedump(struct ust_registry_session *session, | |
af6142cf MD |
557 | struct ust_app *app, |
558 | uint32_t major, | |
559 | uint32_t minor) | |
d0b96690 DG |
560 | { |
561 | unsigned char *uuid_c; | |
562 | char uuid_s[UUID_STR_LEN], | |
563 | clock_uuid_s[UUID_STR_LEN]; | |
564 | int ret = 0; | |
565 | char hostname[HOST_NAME_MAX]; | |
566 | ||
7972aab2 | 567 | assert(session); |
7972aab2 | 568 | |
d0b96690 DG |
569 | uuid_c = session->uuid; |
570 | ||
571 | snprintf(uuid_s, sizeof(uuid_s), | |
572 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
573 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
574 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
575 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
576 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
577 | ||
578 | ret = lttng_metadata_printf(session, | |
579 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
580 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
581 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
582 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
583 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" | |
584 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
585 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
586 | "\n" | |
587 | "trace {\n" | |
588 | " major = %u;\n" | |
589 | " minor = %u;\n" | |
590 | " uuid = \"%s\";\n" | |
591 | " byte_order = %s;\n" | |
592 | " packet.header := struct {\n" | |
593 | " uint32_t magic;\n" | |
594 | " uint8_t uuid[16];\n" | |
595 | " uint32_t stream_id;\n" | |
596 | " };\n" | |
597 | "};\n\n", | |
598 | session->uint8_t_alignment, | |
599 | session->uint16_t_alignment, | |
600 | session->uint32_t_alignment, | |
601 | session->uint64_t_alignment, | |
602 | session->bits_per_long, | |
603 | session->long_alignment, | |
604 | CTF_SPEC_MAJOR, | |
605 | CTF_SPEC_MINOR, | |
606 | uuid_s, | |
607 | session->byte_order == BIG_ENDIAN ? "be" : "le" | |
608 | ); | |
609 | if (ret) | |
610 | goto end; | |
611 | ||
612 | /* ignore error, just use empty string if error. */ | |
613 | hostname[0] = '\0'; | |
614 | ret = gethostname(hostname, sizeof(hostname)); | |
615 | if (ret && errno == ENAMETOOLONG) | |
616 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
617 | ret = lttng_metadata_printf(session, | |
618 | "env {\n" | |
619 | " hostname = \"%s\";\n" | |
620 | " domain = \"ust\";\n" | |
621 | " tracer_name = \"lttng-ust\";\n" | |
622 | " tracer_major = %u;\n" | |
af6142cf | 623 | " tracer_minor = %u;\n", |
d0b96690 | 624 | hostname, |
af6142cf MD |
625 | major, |
626 | minor | |
d0b96690 DG |
627 | ); |
628 | if (ret) | |
629 | goto end; | |
630 | ||
631 | /* | |
632 | * If per-application registry, we can output extra information | |
633 | * about the application. | |
634 | */ | |
635 | if (app) { | |
636 | ret = lttng_metadata_printf(session, | |
af6142cf | 637 | " tracer_patchlevel = %u;\n" |
d0b96690 | 638 | " vpid = %d;\n" |
d88aee68 | 639 | " procname = \"%s\";\n", |
af6142cf | 640 | app->version.patchlevel, |
d0b96690 DG |
641 | (int) app->pid, |
642 | app->name | |
643 | ); | |
644 | if (ret) | |
645 | goto end; | |
646 | } | |
647 | ||
648 | ret = lttng_metadata_printf(session, | |
649 | "};\n\n" | |
650 | ); | |
651 | if (ret) | |
652 | goto end; | |
653 | ||
654 | ||
655 | ret = lttng_metadata_printf(session, | |
656 | "clock {\n" | |
657 | " name = %s;\n", | |
658 | "monotonic" | |
659 | ); | |
660 | if (ret) | |
661 | goto end; | |
662 | ||
663 | if (!trace_clock_uuid(clock_uuid_s)) { | |
664 | ret = lttng_metadata_printf(session, | |
665 | " uuid = \"%s\";\n", | |
666 | clock_uuid_s | |
667 | ); | |
668 | if (ret) | |
669 | goto end; | |
670 | } | |
671 | ||
672 | ret = lttng_metadata_printf(session, | |
673 | " description = \"Monotonic Clock\";\n" | |
674 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
675 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
676 | " offset = %" PRIu64 ";\n" | |
677 | "};\n\n", | |
678 | trace_clock_freq(), | |
679 | measure_clock_offset() | |
680 | ); | |
681 | if (ret) | |
682 | goto end; | |
683 | ||
684 | ret = lttng_metadata_printf(session, | |
685 | "typealias integer {\n" | |
686 | " size = 27; align = 1; signed = false;\n" | |
687 | " map = clock.monotonic.value;\n" | |
688 | "} := uint27_clock_monotonic_t;\n" | |
689 | "\n" | |
690 | "typealias integer {\n" | |
691 | " size = 32; align = %u; signed = false;\n" | |
692 | " map = clock.monotonic.value;\n" | |
693 | "} := uint32_clock_monotonic_t;\n" | |
694 | "\n" | |
695 | "typealias integer {\n" | |
696 | " size = 64; align = %u; signed = false;\n" | |
697 | " map = clock.monotonic.value;\n" | |
698 | "} := uint64_clock_monotonic_t;\n\n", | |
699 | session->uint32_t_alignment, | |
700 | session->uint64_t_alignment | |
701 | ); | |
702 | if (ret) | |
703 | goto end; | |
704 | ||
705 | ret = _lttng_stream_packet_context_declare(session); | |
706 | if (ret) | |
707 | goto end; | |
708 | ||
709 | ret = _lttng_event_header_declare(session); | |
710 | if (ret) | |
711 | goto end; | |
712 | ||
713 | end: | |
714 | return ret; | |
715 | } |