Commit | Line | Data |
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7ab8c616 FD |
1 | /* |
2 | * msgpack.c | |
3 | * | |
4 | * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com> | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; only | |
9 | * version 2.1 of the License. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #define _GNU_SOURCE | |
22 | #define _LGPL_SOURCE | |
7ab8c616 FD |
23 | |
24 | #define MSGPACK_FIXSTR_ID_MASK 0xA0 | |
25 | #define MSGPACK_FIXMAP_ID_MASK 0x80 | |
26 | #define MSGPACK_FIXARRAY_ID_MASK 0x90 | |
27 | ||
28 | #define MSGPACK_NIL_ID 0xC0 | |
29 | #define MSGPACK_FALSE_ID 0xC2 | |
30 | #define MSGPACK_TRUE_ID 0xC3 | |
31 | #define MSGPACK_MAP16_ID 0xDE | |
32 | #define MSGPACK_ARRAY16_ID 0xDC | |
33 | ||
34 | #define MSGPACK_UINT8_ID 0xCC | |
35 | #define MSGPACK_UINT16_ID 0xCD | |
36 | #define MSGPACK_UINT32_ID 0xCE | |
37 | #define MSGPACK_UINT64_ID 0xCF | |
38 | ||
39 | #define MSGPACK_INT8_ID 0xD0 | |
40 | #define MSGPACK_INT16_ID 0xD1 | |
41 | #define MSGPACK_INT32_ID 0xD2 | |
42 | #define MSGPACK_INT64_ID 0xD3 | |
43 | ||
44 | #define MSGPACK_FLOAT64_ID 0xCB | |
45 | #define MSGPACK_STR16_ID 0xDA | |
46 | ||
47 | #define MSGPACK_FIXINT_MAX ((1 << 7) - 1) | |
48 | #define MSGPACK_FIXINT_MIN -(1 << 5) | |
49 | #define MSGPACK_FIXMAP_MAX_COUNT 15 | |
50 | #define MSGPACK_FIXARRAY_MAX_COUNT 15 | |
51 | #define MSGPACK_FIXSTR_MAX_LENGTH 31 | |
52 | ||
53 | #ifdef __KERNEL__ | |
54 | #include <linux/bug.h> | |
55 | #include <linux/string.h> | |
56 | #include <linux/types.h> | |
caf6ac49 | 57 | #include <asm/byteorder.h> |
7ab8c616 FD |
58 | |
59 | #include <lttng/msgpack.h> | |
3bba89d9 | 60 | #include <lttng/probe-user.h> |
7ab8c616 FD |
61 | |
62 | #define INT8_MIN (-128) | |
63 | #define INT16_MIN (-32767-1) | |
64 | #define INT32_MIN (-2147483647-1) | |
65 | #define INT8_MAX (127) | |
66 | #define INT16_MAX (32767) | |
67 | #define INT32_MAX (2147483647) | |
68 | #define UINT8_MAX (255) | |
69 | #define UINT16_MAX (65535) | |
70 | #define UINT32_MAX (4294967295U) | |
71 | ||
72 | #define byteswap_host_to_be16(_tmp) cpu_to_be16(_tmp) | |
73 | #define byteswap_host_to_be32(_tmp) cpu_to_be32(_tmp) | |
74 | #define byteswap_host_to_be64(_tmp) cpu_to_be64(_tmp) | |
75 | ||
76 | #define lttng_msgpack_assert(cond) WARN_ON(!(cond)) | |
77 | ||
78 | #else /* __KERNEL__ */ | |
79 | ||
80 | #include <endian.h> | |
81 | #include <stdio.h> | |
82 | #include <string.h> | |
83 | ||
84 | #include "msgpack.h" | |
85 | ||
86 | #define byteswap_host_to_be16(_tmp) htobe16(_tmp) | |
87 | #define byteswap_host_to_be32(_tmp) htobe32(_tmp) | |
88 | #define byteswap_host_to_be64(_tmp) htobe64(_tmp) | |
89 | ||
90 | #define lttng_msgpack_assert(cond) ({ \ | |
91 | if (!(cond)) \ | |
92 | fprintf(stderr, "Assertion failed. %s:%d\n", __FILE__, __LINE__); \ | |
93 | }) | |
94 | #endif /* __KERNEL__ */ | |
95 | ||
96 | static inline int lttng_msgpack_append_buffer( | |
97 | struct lttng_msgpack_writer *writer, | |
98 | const uint8_t *buf, | |
99 | size_t length) | |
100 | { | |
101 | int ret = 0; | |
102 | ||
103 | lttng_msgpack_assert(buf); | |
104 | ||
105 | /* Ensure we are not trying to write after the end of the buffer. */ | |
106 | if (writer->write_pos + length > writer->end_write_pos) { | |
107 | ret = -1; | |
108 | goto end; | |
109 | } | |
110 | ||
111 | memcpy(writer->write_pos, buf, length); | |
112 | writer->write_pos += length; | |
113 | end: | |
114 | return ret; | |
115 | } | |
116 | ||
3bba89d9 MD |
117 | static inline int lttng_msgpack_append_user_buffer( |
118 | struct lttng_msgpack_writer *writer, | |
119 | const uint8_t __user *ubuf, | |
120 | size_t length) | |
121 | { | |
122 | int ret = 0; | |
123 | ||
124 | lttng_msgpack_assert(ubuf); | |
125 | ||
126 | /* Ensure we are not trying to write after the end of the buffer. */ | |
127 | if (writer->write_pos + length > writer->end_write_pos) { | |
128 | ret = -1; | |
129 | goto end; | |
130 | } | |
131 | ||
132 | if (lttng_copy_from_user_check_nofault(writer->write_pos, ubuf, length)) { | |
133 | /* | |
134 | * After a successful strlen user, a page fault on copy is handled by | |
135 | * considering the string as empty, returning a success. | |
136 | */ | |
137 | goto end; | |
138 | } | |
139 | writer->write_pos += length; | |
140 | end: | |
141 | return ret; | |
142 | } | |
143 | ||
7ab8c616 FD |
144 | static inline int lttng_msgpack_append_u8( |
145 | struct lttng_msgpack_writer *writer, uint8_t value) | |
146 | { | |
147 | return lttng_msgpack_append_buffer(writer, &value, sizeof(value)); | |
148 | } | |
149 | ||
150 | static inline int lttng_msgpack_append_u16( | |
151 | struct lttng_msgpack_writer *writer, uint16_t value) | |
152 | { | |
153 | value = byteswap_host_to_be16(value); | |
154 | ||
155 | return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); | |
156 | } | |
157 | ||
158 | static inline int lttng_msgpack_append_u32( | |
159 | struct lttng_msgpack_writer *writer, uint32_t value) | |
160 | { | |
161 | value = byteswap_host_to_be32(value); | |
162 | ||
163 | return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); | |
164 | } | |
165 | ||
166 | static inline int lttng_msgpack_append_u64( | |
167 | struct lttng_msgpack_writer *writer, uint64_t value) | |
168 | { | |
169 | value = byteswap_host_to_be64(value); | |
170 | ||
171 | return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); | |
172 | } | |
173 | ||
7ab8c616 FD |
174 | static inline int lttng_msgpack_append_i8( |
175 | struct lttng_msgpack_writer *writer, int8_t value) | |
176 | { | |
177 | return lttng_msgpack_append_u8(writer, (uint8_t) value); | |
178 | } | |
179 | ||
180 | static inline int lttng_msgpack_append_i16( | |
181 | struct lttng_msgpack_writer *writer, int16_t value) | |
182 | { | |
183 | return lttng_msgpack_append_u16(writer, (uint16_t) value); | |
184 | } | |
185 | ||
186 | static inline int lttng_msgpack_append_i32( | |
187 | struct lttng_msgpack_writer *writer, int32_t value) | |
188 | { | |
189 | return lttng_msgpack_append_u32(writer, (uint32_t) value); | |
190 | } | |
191 | ||
192 | static inline int lttng_msgpack_append_i64( | |
193 | struct lttng_msgpack_writer *writer, int64_t value) | |
194 | { | |
195 | return lttng_msgpack_append_u64(writer, (uint64_t) value); | |
196 | } | |
197 | ||
7ab8c616 FD |
198 | static inline int lttng_msgpack_encode_fixmap( |
199 | struct lttng_msgpack_writer *writer, uint8_t count) | |
200 | { | |
201 | int ret = 0; | |
202 | ||
203 | lttng_msgpack_assert(count <= MSGPACK_FIXMAP_MAX_COUNT); | |
204 | ||
205 | ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXMAP_ID_MASK | count); | |
206 | if (ret) | |
207 | goto end; | |
208 | ||
209 | end: | |
210 | return ret; | |
211 | } | |
212 | ||
213 | static inline int lttng_msgpack_encode_map16( | |
214 | struct lttng_msgpack_writer *writer, uint16_t count) | |
215 | { | |
216 | int ret; | |
217 | ||
218 | lttng_msgpack_assert(count > MSGPACK_FIXMAP_MAX_COUNT); | |
219 | ||
220 | ret = lttng_msgpack_append_u8(writer, MSGPACK_MAP16_ID); | |
221 | if (ret) | |
222 | goto end; | |
223 | ||
224 | ret = lttng_msgpack_append_u16(writer, count); | |
225 | if (ret) | |
226 | goto end; | |
227 | ||
228 | end: | |
229 | return ret; | |
230 | } | |
231 | ||
232 | static inline int lttng_msgpack_encode_fixarray( | |
233 | struct lttng_msgpack_writer *writer, uint8_t count) | |
234 | { | |
235 | int ret = 0; | |
236 | ||
237 | lttng_msgpack_assert(count <= MSGPACK_FIXARRAY_MAX_COUNT); | |
238 | ||
239 | ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXARRAY_ID_MASK | count); | |
240 | if (ret) | |
241 | goto end; | |
242 | ||
243 | end: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | static inline int lttng_msgpack_encode_array16( | |
248 | struct lttng_msgpack_writer *writer, uint16_t count) | |
249 | { | |
250 | int ret; | |
251 | ||
252 | lttng_msgpack_assert(count > MSGPACK_FIXARRAY_MAX_COUNT); | |
253 | ||
254 | ret = lttng_msgpack_append_u8(writer, MSGPACK_ARRAY16_ID); | |
255 | if (ret) | |
256 | goto end; | |
257 | ||
258 | ret = lttng_msgpack_append_u16(writer, count); | |
259 | if (ret) | |
260 | goto end; | |
261 | ||
262 | end: | |
263 | return ret; | |
264 | } | |
265 | ||
266 | static inline int lttng_msgpack_encode_fixstr( | |
267 | struct lttng_msgpack_writer *writer, | |
268 | const char *str, | |
269 | uint8_t len) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | lttng_msgpack_assert(len <= MSGPACK_FIXSTR_MAX_LENGTH); | |
274 | ||
275 | ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXSTR_ID_MASK | len); | |
276 | if (ret) | |
277 | goto end; | |
278 | ||
279 | ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len); | |
280 | if (ret) | |
281 | goto end; | |
282 | ||
283 | end: | |
284 | return ret; | |
285 | } | |
286 | ||
287 | static inline int lttng_msgpack_encode_str16( | |
288 | struct lttng_msgpack_writer *writer, | |
289 | const char *str, | |
290 | uint16_t len) | |
291 | { | |
292 | int ret; | |
293 | ||
294 | lttng_msgpack_assert(len > MSGPACK_FIXSTR_MAX_LENGTH); | |
295 | ||
296 | ret = lttng_msgpack_append_u8(writer, MSGPACK_STR16_ID); | |
297 | if (ret) | |
298 | goto end; | |
299 | ||
300 | ret = lttng_msgpack_append_u16(writer, len); | |
301 | if (ret) | |
302 | goto end; | |
303 | ||
304 | ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len); | |
305 | if (ret) | |
306 | goto end; | |
307 | ||
308 | end: | |
309 | return ret; | |
310 | } | |
311 | ||
3bba89d9 MD |
312 | static inline int lttng_msgpack_encode_user_fixstr( |
313 | struct lttng_msgpack_writer *writer, | |
314 | const char __user *ustr, | |
315 | uint8_t len) | |
316 | { | |
317 | int ret; | |
318 | ||
319 | lttng_msgpack_assert(len <= MSGPACK_FIXSTR_MAX_LENGTH); | |
320 | ||
321 | ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXSTR_ID_MASK | len); | |
322 | if (ret) | |
323 | goto end; | |
324 | ||
325 | ret = lttng_msgpack_append_user_buffer(writer, (uint8_t __user *) ustr, len); | |
326 | if (ret) | |
327 | goto end; | |
328 | ||
329 | end: | |
330 | return ret; | |
331 | } | |
332 | ||
333 | static inline int lttng_msgpack_encode_user_str16( | |
334 | struct lttng_msgpack_writer *writer, | |
335 | const char __user *ustr, | |
336 | uint16_t len) | |
337 | { | |
338 | int ret; | |
339 | ||
340 | lttng_msgpack_assert(len > MSGPACK_FIXSTR_MAX_LENGTH); | |
341 | ||
342 | ret = lttng_msgpack_append_u8(writer, MSGPACK_STR16_ID); | |
343 | if (ret) | |
344 | goto end; | |
345 | ||
346 | ret = lttng_msgpack_append_u16(writer, len); | |
347 | if (ret) | |
348 | goto end; | |
349 | ||
350 | ret = lttng_msgpack_append_user_buffer(writer, (uint8_t __user *) ustr, len); | |
351 | if (ret) | |
352 | goto end; | |
353 | ||
354 | end: | |
355 | return ret; | |
356 | } | |
357 | ||
358 | ||
7ab8c616 FD |
359 | int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count) |
360 | { | |
361 | int ret; | |
362 | ||
9b6ae9f6 | 363 | if (count >= (1 << 16)) { |
7ab8c616 FD |
364 | ret = -1; |
365 | goto end; | |
366 | } | |
367 | ||
368 | if (count <= MSGPACK_FIXMAP_MAX_COUNT) | |
369 | ret = lttng_msgpack_encode_fixmap(writer, count); | |
370 | else | |
371 | ret = lttng_msgpack_encode_map16(writer, count); | |
372 | ||
373 | writer->map_nesting++; | |
374 | end: | |
375 | return ret; | |
376 | } | |
377 | ||
378 | int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer) | |
379 | { | |
380 | lttng_msgpack_assert(writer->map_nesting > 0); | |
381 | writer->map_nesting--; | |
382 | return 0; | |
383 | } | |
384 | ||
385 | int lttng_msgpack_begin_array( | |
386 | struct lttng_msgpack_writer *writer, size_t count) | |
387 | { | |
388 | int ret; | |
389 | ||
9b6ae9f6 | 390 | if (count >= (1 << 16)) { |
7ab8c616 FD |
391 | ret = -1; |
392 | goto end; | |
393 | } | |
394 | ||
395 | if (count <= MSGPACK_FIXARRAY_MAX_COUNT) | |
396 | ret = lttng_msgpack_encode_fixarray(writer, count); | |
397 | else | |
398 | ret = lttng_msgpack_encode_array16(writer, count); | |
399 | ||
400 | writer->array_nesting++; | |
401 | end: | |
402 | return ret; | |
403 | } | |
404 | ||
405 | int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer) | |
406 | { | |
407 | lttng_msgpack_assert(writer->array_nesting > 0); | |
408 | writer->array_nesting--; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer, | |
413 | const char *str) | |
414 | { | |
415 | int ret; | |
416 | size_t length = strlen(str); | |
9b6ae9f6 MD |
417 | |
418 | if (length >= (1 << 16)) { | |
7ab8c616 FD |
419 | ret = -1; |
420 | goto end; | |
421 | } | |
422 | ||
423 | if (length <= MSGPACK_FIXSTR_MAX_LENGTH) | |
424 | ret = lttng_msgpack_encode_fixstr(writer, str, length); | |
425 | else | |
426 | ret = lttng_msgpack_encode_str16(writer, str, length); | |
427 | ||
428 | end: | |
429 | return ret; | |
430 | } | |
431 | ||
3bba89d9 MD |
432 | /* |
433 | * Provide the same behavior on lttng_strlen_user_inatomic page fault as the | |
434 | * lttng ring buffer: truncate the last string character. | |
435 | */ | |
436 | int lttng_msgpack_write_user_str(struct lttng_msgpack_writer *writer, | |
437 | const char __user *ustr) | |
438 | { | |
439 | int ret; | |
440 | size_t length = max_t(size_t, lttng_strlen_user_inatomic(ustr), 1); | |
441 | ||
442 | if (length >= (1 << 16)) { | |
443 | ret = -1; | |
444 | goto end; | |
445 | } | |
446 | ||
447 | /* | |
448 | * Handle empty string and strlen user page fault as empty string. | |
449 | */ | |
450 | if (length == 1) | |
451 | return lttng_msgpack_write_str(writer, ""); | |
452 | ||
453 | if (length <= MSGPACK_FIXSTR_MAX_LENGTH) | |
454 | ret = lttng_msgpack_encode_user_fixstr(writer, ustr, length); | |
455 | else | |
456 | ret = lttng_msgpack_encode_user_str16(writer, ustr, length); | |
457 | ||
458 | end: | |
459 | return ret; | |
460 | } | |
461 | ||
7ab8c616 FD |
462 | int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer) |
463 | { | |
464 | return lttng_msgpack_append_u8(writer, MSGPACK_NIL_ID); | |
465 | } | |
466 | ||
467 | int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer) | |
468 | { | |
469 | return lttng_msgpack_append_u8(writer, MSGPACK_TRUE_ID); | |
470 | } | |
471 | ||
472 | int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer) | |
473 | { | |
474 | return lttng_msgpack_append_u8(writer, MSGPACK_FALSE_ID); | |
475 | } | |
476 | ||
477 | int lttng_msgpack_write_unsigned_integer( | |
478 | struct lttng_msgpack_writer *writer, uint64_t value) | |
479 | { | |
480 | int ret = 0; | |
481 | ||
482 | if (value <= MSGPACK_FIXINT_MAX) { | |
483 | ret = lttng_msgpack_append_u8(writer, (uint8_t) value); | |
484 | if (ret) | |
485 | goto end; | |
486 | } else if (value <= UINT8_MAX) { | |
487 | ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT8_ID); | |
488 | if (ret) | |
489 | goto end; | |
490 | ||
491 | ret = lttng_msgpack_append_u8(writer, (uint8_t) value); | |
492 | if (ret) | |
493 | goto end; | |
494 | } else if (value <= UINT16_MAX) { | |
495 | ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT16_ID); | |
496 | if (ret) | |
497 | goto end; | |
498 | ||
499 | ret = lttng_msgpack_append_u16(writer, (uint16_t) value); | |
500 | if (ret) | |
501 | goto end; | |
502 | } else if (value <= UINT32_MAX) { | |
503 | ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT32_ID); | |
504 | if (ret) | |
505 | goto end; | |
506 | ||
507 | ret = lttng_msgpack_append_u32(writer, (uint32_t) value); | |
508 | if (ret) | |
509 | goto end; | |
510 | } else { | |
511 | ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT64_ID); | |
512 | if (ret) | |
513 | goto end; | |
514 | ||
515 | ret = lttng_msgpack_append_u64(writer, value); | |
516 | if (ret) | |
517 | goto end; | |
518 | } | |
519 | ||
520 | end: | |
521 | return ret; | |
522 | } | |
523 | ||
524 | int lttng_msgpack_write_signed_integer(struct lttng_msgpack_writer *writer, int64_t value) | |
525 | { | |
526 | int ret; | |
527 | ||
528 | if (value >= MSGPACK_FIXINT_MIN && value <= MSGPACK_FIXINT_MAX){ | |
529 | ret = lttng_msgpack_append_i8(writer, (int8_t) value); | |
530 | if (ret) | |
531 | goto end; | |
532 | } else if (value >= INT8_MIN && value <= INT8_MAX) { | |
533 | ret = lttng_msgpack_append_u8(writer, MSGPACK_INT8_ID); | |
534 | if (ret) | |
535 | goto end; | |
536 | ||
537 | ret = lttng_msgpack_append_i8(writer, (int8_t) value); | |
538 | if (ret) | |
539 | goto end; | |
540 | } else if (value >= INT16_MIN && value <= INT16_MAX) { | |
541 | ret = lttng_msgpack_append_u8(writer, MSGPACK_INT16_ID); | |
542 | if (ret) | |
543 | goto end; | |
544 | ||
545 | ret = lttng_msgpack_append_i16(writer, (int16_t) value); | |
546 | if (ret) | |
547 | goto end; | |
548 | } else if (value >= INT32_MIN && value <= INT32_MAX) { | |
549 | ret = lttng_msgpack_append_u8(writer, MSGPACK_INT32_ID); | |
550 | if (ret) | |
551 | goto end; | |
552 | ||
553 | ret = lttng_msgpack_append_i32(writer, (int32_t) value); | |
554 | if (ret) | |
555 | goto end; | |
556 | } else { | |
557 | ret = lttng_msgpack_append_u8(writer, MSGPACK_INT64_ID); | |
558 | if (ret) | |
559 | goto end; | |
560 | ||
561 | ret = lttng_msgpack_append_i64(writer, value); | |
562 | if (ret) | |
563 | goto end; | |
564 | } | |
565 | ||
566 | end: | |
567 | return ret; | |
568 | } | |
569 | ||
76db4808 MD |
570 | int lttng_msgpack_save_writer_pos(struct lttng_msgpack_writer *writer, uint8_t **pos) |
571 | { | |
572 | *pos = writer->write_pos; | |
573 | return 0; | |
574 | } | |
575 | ||
576 | int lttng_msgpack_restore_writer_pos(struct lttng_msgpack_writer *writer, uint8_t *pos) | |
577 | { | |
578 | writer->write_pos = pos; | |
579 | return 0; | |
580 | } | |
581 | ||
7ab8c616 FD |
582 | void lttng_msgpack_writer_init(struct lttng_msgpack_writer *writer, |
583 | uint8_t *buffer, size_t size) | |
584 | { | |
585 | lttng_msgpack_assert(buffer); | |
586 | lttng_msgpack_assert(size >= 0); | |
587 | ||
588 | writer->buffer = buffer; | |
589 | writer->write_pos = buffer; | |
590 | writer->end_write_pos = buffer + size; | |
591 | ||
592 | writer->array_nesting = 0; | |
593 | writer->map_nesting = 0; | |
594 | } | |
595 | ||
596 | void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer) | |
597 | { | |
598 | memset(writer, 0, sizeof(*writer)); | |
599 | } |