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