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[thirdparty/systemd.git] / src / basic / time-util.c
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53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
9a98c7a1
LP		 2/***
3 This file is part of systemd.
4
5 Copyright 2010 Lennart Poettering
9a98c7a1
LP		 6***/
7
11c3a366
TA		 8#include <errno.h>
9#include <limits.h>
10#include <stdlib.h>
9a98c7a1 11#include <string.h>
48d26c01 12#include <sys/mman.h>
11c3a366
TA		 13#include <sys/stat.h>
14#include <sys/time.h>
77ff2de9 15#include <sys/timerfd.h>
07630cea 16#include <sys/timex.h>
11c3a366
TA		 17#include <sys/types.h>
18#include <unistd.h>
9a98c7a1 19
b5efdb8a 20#include "alloc-util.h"
3ffd4af2 21#include "fd-util.h"
0d39fa9c 22#include "fileio.h"
f4f15635 23#include "fs-util.h"
11c3a366
TA		 24#include "log.h"
25#include "macro.h"
93cc7779
TA		 26#include "parse-util.h"
27#include "path-util.h"
dccca82b 28#include "process-util.h"
07630cea 29#include "string-util.h"
75683450 30#include "strv.h"
07630cea 31#include "time-util.h"
9a98c7a1 32
32c1f5a5
LP		 33static clockid_t map_clock_id(clockid_t c) {
34
35 /* Some more exotic archs (s390, ppc, …) lack the "ALARM" flavour of the clocks. Thus, clock_gettime() will
36 * fail for them. Since they are essentially the same as their non-ALARM pendants (their only difference is
37 * when timers are set on them), let's just map them accordingly. This way, we can get the correct time even on
bdf19f8f 38 * those archs. */
32c1f5a5
LP		 39
40 switch (c) {
41
42 case CLOCK_BOOTTIME_ALARM:
bdf19f8f 43 return CLOCK_BOOTTIME;
32c1f5a5
LP		 44
45 case CLOCK_REALTIME_ALARM:
46 return CLOCK_REALTIME;
47
48 default:
49 return c;
50 }
51}
52
9a98c7a1
LP		 53usec_t now(clockid_t clock_id) {
54 struct timespec ts;
55
32c1f5a5 56 assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0);
9a98c7a1
LP		 57
58 return timespec_load(&ts);
59}
60
45d7a8bb
LP		 61nsec_t now_nsec(clockid_t clock_id) {
62 struct timespec ts;
63
32c1f5a5 64 assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0);
45d7a8bb
LP		 65
66 return timespec_load_nsec(&ts);
67}
68
9a98c7a1
LP		 69dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
70 assert(ts);
71
72 ts->realtime = now(CLOCK_REALTIME);
73 ts->monotonic = now(CLOCK_MONOTONIC);
74
75 return ts;
76}
77
fe624c4c
LP		 78triple_timestamp* triple_timestamp_get(triple_timestamp *ts) {
79 assert(ts);
80
81 ts->realtime = now(CLOCK_REALTIME);
82 ts->monotonic = now(CLOCK_MONOTONIC);
83 ts->boottime = clock_boottime_supported() ? now(CLOCK_BOOTTIME) : USEC_INFINITY;
84
85 return ts;
86}
87
9a98c7a1
LP		 88dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
89 int64_t delta;
90 assert(ts);
91
75a5f1d8
LP		 92 if (u == USEC_INFINITY || u <= 0) {
93 ts->realtime = ts->monotonic = u;
cae0c5e0
LP		 94 return ts;
95 }
96
9a98c7a1
LP		 97 ts->realtime = u;
98
75a5f1d8 99 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
54d8ef14 100 ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
9a98c7a1
LP		 101
102 return ts;
103}
104
fe624c4c
LP		 105triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u) {
106 int64_t delta;
107
108 assert(ts);
109
110 if (u == USEC_INFINITY || u <= 0) {
111 ts->realtime = ts->monotonic = ts->boottime = u;
112 return ts;
113 }
114
115 ts->realtime = u;
116 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
54d8ef14
LP		 117 ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
118 ts->boottime = clock_boottime_supported() ? usec_sub_signed(now(CLOCK_BOOTTIME), delta) : USEC_INFINITY;
fe624c4c
LP		 119
120 return ts;
121}
122
cae0c5e0
LP		 123dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
124 int64_t delta;
125 assert(ts);
126
3a43da28
KS		 127 if (u == USEC_INFINITY) {
128 ts->realtime = ts->monotonic = USEC_INFINITY;
cae0c5e0
LP		 129 return ts;
130 }
131
132 ts->monotonic = u;
133 delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
54d8ef14 134 ts->realtime = usec_sub_signed(now(CLOCK_REALTIME), delta);
cae0c5e0
LP		 135
136 return ts;
137}
138
fbe55073
LP		 139dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u) {
140 int64_t delta;
141
142 if (u == USEC_INFINITY) {
143 ts->realtime = ts->monotonic = USEC_INFINITY;
144 return ts;
145 }
fbe55073 146
0345d252 147 dual_timestamp_get(ts);
fbe55073 148 delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
54d8ef14
LP		 149 ts->realtime = usec_sub_signed(ts->realtime, delta);
150 ts->monotonic = usec_sub_signed(ts->monotonic, delta);
fbe55073
LP		 151
152 return ts;
153}
154
fe624c4c
LP		 155usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock) {
156
157 switch (clock) {
158
159 case CLOCK_REALTIME:
160 case CLOCK_REALTIME_ALARM:
161 return ts->realtime;
162
163 case CLOCK_MONOTONIC:
164 return ts->monotonic;
165
166 case CLOCK_BOOTTIME:
167 case CLOCK_BOOTTIME_ALARM:
168 return ts->boottime;
169
170 default:
171 return USEC_INFINITY;
172 }
173}
174
9a98c7a1
LP		 175usec_t timespec_load(const struct timespec *ts) {
176 assert(ts);
177
c477ff14 178 if (ts->tv_sec < 0 || ts->tv_nsec < 0)
3a43da28 179 return USEC_INFINITY;
9a98c7a1
LP		 180
181 if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
3a43da28 182 return USEC_INFINITY;
9a98c7a1
LP		 183
184 return
185 (usec_t) ts->tv_sec * USEC_PER_SEC +
186 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
187}
188
3a730176 189nsec_t timespec_load_nsec(const struct timespec *ts) {
45d7a8bb
LP		 190 assert(ts);
191
c477ff14 192 if (ts->tv_sec < 0 || ts->tv_nsec < 0)
45d7a8bb
LP		 193 return NSEC_INFINITY;
194
a2daa2f0
ZJS		 195 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
196 return NSEC_INFINITY;
197
198 return (nsec_t) ts->tv_sec * NSEC_PER_SEC + (nsec_t) ts->tv_nsec;
45d7a8bb
LP		 199}
200
9a98c7a1
LP		 201struct timespec *timespec_store(struct timespec *ts, usec_t u) {
202 assert(ts);
203
f977849c 204 if (u == USEC_INFINITY ||
d201d908 205 u / USEC_PER_SEC >= TIME_T_MAX) {
9a98c7a1
LP		 206 ts->tv_sec = (time_t) -1;
207 ts->tv_nsec = (long) -1;
208 return ts;
209 }
210
211 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
212 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
213
214 return ts;
215}
216
217usec_t timeval_load(const struct timeval *tv) {
218 assert(tv);
219
c477ff14 220 if (tv->tv_sec < 0 || tv->tv_usec < 0)
3a43da28 221 return USEC_INFINITY;
9a98c7a1
LP		 222
223 if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC)
3a43da28 224 return USEC_INFINITY;
9a98c7a1
LP		 225
226 return
227 (usec_t) tv->tv_sec * USEC_PER_SEC +
228 (usec_t) tv->tv_usec;
229}
230
231struct timeval *timeval_store(struct timeval *tv, usec_t u) {
232 assert(tv);
233
68bdd2d2 234 if (u == USEC_INFINITY ||
f977849c 235 u / USEC_PER_SEC > TIME_T_MAX) {
9a98c7a1
LP		 236 tv->tv_sec = (time_t) -1;
237 tv->tv_usec = (suseconds_t) -1;
4d89874a
ZJS		 238 } else {
239 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
240 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
9a98c7a1
LP		 241 }
242
9a98c7a1
LP		 243 return tv;
244}
245
21b3a0fc
LP		 246static char *format_timestamp_internal(
247 char *buf,
248 size_t l,
249 usec_t t,
250 bool utc,
251 bool us) {
252
253 /* The weekdays in non-localized (English) form. We use this instead of the localized form, so that our
254 * generated timestamps may be parsed with parse_timestamp(), and always read the same. */
255 static const char * const weekdays[] = {
256 [0] = "Sun",
257 [1] = "Mon",
258 [2] = "Tue",
259 [3] = "Wed",
260 [4] = "Thu",
261 [5] = "Fri",
262 [6] = "Sat",
263 };
264
9a98c7a1
LP		 265 struct tm tm;
266 time_t sec;
21b3a0fc 267 size_t n;
9a98c7a1
LP		 268
269 assert(buf);
9a98c7a1 270
21b3a0fc
LP		 271 if (l <
272 3 + /* week day */
273 1 + 10 + /* space and date */
274 1 + 8 + /* space and time */
275 (us ? 1 + 6 : 0) + /* "." and microsecond part */
276 1 + 1 + /* space and shortest possible zone */
277 1)
278 return NULL; /* Not enough space even for the shortest form. */
3a43da28 279 if (t <= 0 || t == USEC_INFINITY)
21b3a0fc
LP		 280 return NULL; /* Timestamp is unset */
281
1bb4b028
LP		 282 /* Let's not format times with years > 9999 */
283 if (t > USEC_TIMESTAMP_FORMATTABLE_MAX)
284 return NULL;
285
21b3a0fc 286 sec = (time_t) (t / USEC_PER_SEC); /* Round down */
21b3a0fc
LP		 287
288 if (!localtime_or_gmtime_r(&sec, &tm, utc))
9a98c7a1
LP		 289 return NULL;
290
21b3a0fc
LP		 291 /* Start with the week day */
292 assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays));
293 memcpy(buf, weekdays[tm.tm_wday], 4);
9a98c7a1 294
21b3a0fc
LP		 295 /* Add the main components */
296 if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0)
297 return NULL; /* Doesn't fit */
0056086a 298
21b3a0fc 299 /* Append the microseconds part, if that's requested */
0056086a 300 if (us) {
21b3a0fc
LP		 301 n = strlen(buf);
302 if (n + 8 > l)
303 return NULL; /* Microseconds part doesn't fit. */
304
70887c5f 305 sprintf(buf + n, ".%06"PRI_USEC, t % USEC_PER_SEC);
21b3a0fc
LP		 306 }
307
308 /* Append the timezone */
309 n = strlen(buf);
310 if (utc) {
311 /* If this is UTC then let's explicitly use the "UTC" string here, because gmtime_r() normally uses the
312 * obsolete "GMT" instead. */
313 if (n + 5 > l)
314 return NULL; /* "UTC" doesn't fit. */
315
316 strcpy(buf + n, " UTC");
317
318 } else if (!isempty(tm.tm_zone)) {
319 size_t tn;
320
321 /* An explicit timezone is specified, let's use it, if it fits */
322 tn = strlen(tm.tm_zone);
323 if (n + 1 + tn + 1 > l) {
324 /* The full time zone does not fit in. Yuck. */
325
326 if (n + 1 + _POSIX_TZNAME_MAX + 1 > l)
327 return NULL; /* Not even enough space for the POSIX minimum (of 6)? In that case, complain that it doesn't fit */
328
329 /* So the time zone doesn't fit in fully, but the caller passed enough space for the POSIX
330 * minimum time zone length. In this case suppress the timezone entirely, in order not to dump
331 * an overly long, hard to read string on the user. This should be safe, because the user will
332 * assume the local timezone anyway if none is shown. And so does parse_timestamp(). */
333 } else {
334 buf[n++] = ' ';
335 strcpy(buf + n, tm.tm_zone);
336 }
0056086a 337 }
9a98c7a1
LP		 338
339 return buf;
340}
341
a62e83b4 342char *format_timestamp(char *buf, size_t l, usec_t t) {
0056086a 343 return format_timestamp_internal(buf, l, t, false, false);
a62e83b4
JS		 344}
345
5ab99e07 346char *format_timestamp_utc(char *buf, size_t l, usec_t t) {
0056086a 347 return format_timestamp_internal(buf, l, t, true, false);
f02d8367
ZJS		 348}
349
5ab99e07 350char *format_timestamp_us(char *buf, size_t l, usec_t t) {
0056086a 351 return format_timestamp_internal(buf, l, t, false, true);
5ab99e07
LP		 352}
353
354char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {
0056086a 355 return format_timestamp_internal(buf, l, t, true, true);
5ab99e07
LP		 356}
357
bbb8486e 358char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
1fcf71f5 359 const char *s;
9a98c7a1
LP		 360 usec_t n, d;
361
65de0395 362 if (t <= 0 || t == USEC_INFINITY)
9a98c7a1
LP		 363 return NULL;
364
65de0395 365 n = now(CLOCK_REALTIME);
1fcf71f5
LP		 366 if (n > t) {
367 d = n - t;
368 s = "ago";
369 } else {
370 d = t - n;
371 s = "left";
372 }
9a98c7a1
LP		 373
374 if (d >= USEC_PER_YEAR)
609e002e 375 snprintf(buf, l, USEC_FMT " years " USEC_FMT " months %s",
de0671ee
ZJS		 376 d / USEC_PER_YEAR,
377 (d % USEC_PER_YEAR) / USEC_PER_MONTH, s);
9a98c7a1 378 else if (d >= USEC_PER_MONTH)
609e002e 379 snprintf(buf, l, USEC_FMT " months " USEC_FMT " days %s",
de0671ee
ZJS		 380 d / USEC_PER_MONTH,
381 (d % USEC_PER_MONTH) / USEC_PER_DAY, s);
9a98c7a1 382 else if (d >= USEC_PER_WEEK)
609e002e 383 snprintf(buf, l, USEC_FMT " weeks " USEC_FMT " days %s",
de0671ee
ZJS		 384 d / USEC_PER_WEEK,
385 (d % USEC_PER_WEEK) / USEC_PER_DAY, s);
9a98c7a1 386 else if (d >= 2*USEC_PER_DAY)
609e002e 387 snprintf(buf, l, USEC_FMT " days %s", d / USEC_PER_DAY, s);
9a98c7a1 388 else if (d >= 25*USEC_PER_HOUR)
609e002e 389 snprintf(buf, l, "1 day " USEC_FMT "h %s",
de0671ee 390 (d - USEC_PER_DAY) / USEC_PER_HOUR, s);
9a98c7a1 391 else if (d >= 6*USEC_PER_HOUR)
609e002e 392 snprintf(buf, l, USEC_FMT "h %s",
de0671ee 393 d / USEC_PER_HOUR, s);
9a98c7a1 394 else if (d >= USEC_PER_HOUR)
609e002e 395 snprintf(buf, l, USEC_FMT "h " USEC_FMT "min %s",
de0671ee
ZJS		 396 d / USEC_PER_HOUR,
397 (d % USEC_PER_HOUR) / USEC_PER_MINUTE, s);
9a98c7a1 398 else if (d >= 5*USEC_PER_MINUTE)
609e002e 399 snprintf(buf, l, USEC_FMT "min %s",
de0671ee 400 d / USEC_PER_MINUTE, s);
9a98c7a1 401 else if (d >= USEC_PER_MINUTE)
609e002e 402 snprintf(buf, l, USEC_FMT "min " USEC_FMT "s %s",
de0671ee
ZJS		 403 d / USEC_PER_MINUTE,
404 (d % USEC_PER_MINUTE) / USEC_PER_SEC, s);
9a98c7a1 405 else if (d >= USEC_PER_SEC)
609e002e 406 snprintf(buf, l, USEC_FMT "s %s",
de0671ee 407 d / USEC_PER_SEC, s);
9a98c7a1 408 else if (d >= USEC_PER_MSEC)
609e002e 409 snprintf(buf, l, USEC_FMT "ms %s",
de0671ee 410 d / USEC_PER_MSEC, s);
9a98c7a1 411 else if (d > 0)
de0671ee
ZJS		 412 snprintf(buf, l, USEC_FMT"us %s",
413 d, s);
9a98c7a1
LP		 414 else
415 snprintf(buf, l, "now");
416
417 buf[l-1] = 0;
418 return buf;
419}
420
2fa4092c 421char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
9a98c7a1
LP		 422 static const struct {
423 const char *suffix;
424 usec_t usec;
425 } table[] = {
eb55ec9f
LP		 426 { "y", USEC_PER_YEAR },
427 { "month", USEC_PER_MONTH },
428 { "w", USEC_PER_WEEK },
429 { "d", USEC_PER_DAY },
430 { "h", USEC_PER_HOUR },
431 { "min", USEC_PER_MINUTE },
432 { "s", USEC_PER_SEC },
433 { "ms", USEC_PER_MSEC },
434 { "us", 1 },
9a98c7a1
LP		 435 };
436
437 unsigned i;
438 char *p = buf;
2fa4092c 439 bool something = false;
9a98c7a1
LP		 440
441 assert(buf);
442 assert(l > 0);
443
bb1fada8
LP		 444 if (t == USEC_INFINITY) {
445 strncpy(p, "infinity", l-1);
446 p[l-1] = 0;
447 return p;
448 }
449
450 if (t <= 0) {
451 strncpy(p, "0", l-1);
7c537b2e
LP		 452 p[l-1] = 0;
453 return p;
454 }
455
7f602784 456 /* The result of this function can be parsed with parse_sec */
9a98c7a1
LP		 457
458 for (i = 0; i < ELEMENTSOF(table); i++) {
7759ecb2 459 int k = 0;
9a98c7a1 460 size_t n;
2fa4092c
LP		 461 bool done = false;
462 usec_t a, b;
463
7c537b2e
LP		 464 if (t <= 0)
465 break;
2fa4092c 466
7c537b2e 467 if (t < accuracy && something)
2fa4092c 468 break;
9a98c7a1
LP		 469
470 if (t < table[i].usec)
471 continue;
472
473 if (l <= 1)
474 break;
475
2fa4092c
LP		 476 a = t / table[i].usec;
477 b = t % table[i].usec;
478
479 /* Let's see if we should shows this in dot notation */
480 if (t < USEC_PER_MINUTE && b > 0) {
481 usec_t cc;
482 int j;
483
484 j = 0;
485 for (cc = table[i].usec; cc > 1; cc /= 10)
486 j++;
487
488 for (cc = accuracy; cc > 1; cc /= 10) {
489 b /= 10;
490 j--;
491 }
492
493 if (j > 0) {
494 k = snprintf(p, l,
70887c5f 495 "%s"USEC_FMT".%0*"PRI_USEC"%s",
2fa4092c 496 p > buf ? " " : "",
de0671ee 497 a,
2fa4092c 498 j,
70887c5f 499 b,
2fa4092c
LP		 500 table[i].suffix);
501
502 t = 0;
503 done = true;
504 }
505 }
506
507 /* No? Then let's show it normally */
508 if (!done) {
509 k = snprintf(p, l,
de0671ee 510 "%s"USEC_FMT"%s",
2fa4092c 511 p > buf ? " " : "",
de0671ee 512 a,
2fa4092c
LP		 513 table[i].suffix);
514
515 t = b;
516 }
517
9a98c7a1
LP		 518 n = MIN((size_t) k, l);
519
520 l -= n;
521 p += n;
522
2fa4092c 523 something = true;
9a98c7a1
LP		 524 }
525
526 *p = 0;
527
528 return buf;
529}
530
531void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
532
533 assert(f);
534 assert(name);
535 assert(t);
536
537 if (!dual_timestamp_is_set(t))
538 return;
539
de0671ee 540 fprintf(f, "%s="USEC_FMT" "USEC_FMT"\n",
9a98c7a1 541 name,
de0671ee
ZJS		 542 t->realtime,
543 t->monotonic);
9a98c7a1
LP		 544}
545
e911de99 546int dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
74c5b33b 547 uint64_t a, b;
9c0565b2 548 int r, pos;
9a98c7a1
LP		 549
550 assert(value);
551 assert(t);
552
9c0565b2
ZJS		 553 pos = strspn(value, WHITESPACE);
554 if (value[pos] == '-')
555 return -EINVAL;
556 pos += strspn(value + pos, DIGITS);
557 pos += strspn(value + pos, WHITESPACE);
558 if (value[pos] == '-')
559 return -EINVAL;
560
561 r = sscanf(value, "%" PRIu64 "%" PRIu64 "%n", &a, &b, &pos);
562 if (r != 2) {
563 log_debug("Failed to parse dual timestamp value \"%s\".", value);
e911de99 564 return -EINVAL;
9a98c7a1 565 }
e911de99 566
9c0565b2
ZJS		 567 if (value[pos] != '\0')
568 /* trailing garbage */
569 return -EINVAL;
570
e911de99
LP		 571 t->realtime = a;
572 t->monotonic = b;
573
574 return 0;
9a98c7a1
LP		 575}
576
b895a735 577int timestamp_deserialize(const char *value, usec_t *timestamp) {
ebf30a08
AK		 578 int r;
579
580 assert(value);
581
582 r = safe_atou64(value, timestamp);
ebf30a08 583 if (r < 0)
b895a735 584 return log_debug_errno(r, "Failed to parse timestamp value \"%s\": %m", value);
ebf30a08
AK		 585
586 return r;
587}
588
48d26c01 589static int parse_timestamp_impl(const char *t, usec_t *usec, bool with_tz) {
92134489
LP		 590 static const struct {
591 const char *name;
592 const int nr;
593 } day_nr[] = {
594 { "Sunday", 0 },
595 { "Sun", 0 },
596 { "Monday", 1 },
597 { "Mon", 1 },
598 { "Tuesday", 2 },
599 { "Tue", 2 },
600 { "Wednesday", 3 },
601 { "Wed", 3 },
602 { "Thursday", 4 },
603 { "Thu", 4 },
604 { "Friday", 5 },
605 { "Fri", 5 },
606 { "Saturday", 6 },
607 { "Sat", 6 },
608 };
609
48d26c01 610 const char *k, *utc = NULL, *tzn = NULL;
9a98c7a1
LP		 611 struct tm tm, copy;
612 time_t x;
e4eaf99a 613 usec_t x_usec, plus = 0, minus = 0, ret;
21b3a0fc 614 int r, weekday = -1, dst = -1;
92134489 615 unsigned i;
9a98c7a1
LP		 616
617 /*
618 * Allowed syntaxes:
619 *
620 * 2012-09-22 16:34:22
621 * 2012-09-22 16:34 (seconds will be set to 0)
622 * 2012-09-22 (time will be set to 00:00:00)
623 * 16:34:22 (date will be set to today)
624 * 16:34 (date will be set to today, seconds to 0)
625 * now
626 * yesterday (time is set to 00:00:00)
627 * today (time is set to 00:00:00)
628 * tomorrow (time is set to 00:00:00)
629 * +5min
630 * -5days
5ba6e094 631 * @2147483647 (seconds since epoch)
9a98c7a1
LP		 632 *
633 */
634
635 assert(t);
636 assert(usec);
637
48d26c01 638 if (t[0] == '@' && !with_tz)
e4eaf99a 639 return parse_sec(t + 1, usec);
9a98c7a1 640
e4eaf99a 641 ret = now(CLOCK_REALTIME);
9a98c7a1 642
48d26c01
IK		 643 if (!with_tz) {
644 if (streq(t, "now"))
645 goto finish;
9a98c7a1 646
48d26c01
IK		 647 else if (t[0] == '+') {
648 r = parse_sec(t+1, &plus);
649 if (r < 0)
650 return r;
9a98c7a1 651
48d26c01 652 goto finish;
9a98c7a1 653
48d26c01
IK		 654 } else if (t[0] == '-') {
655 r = parse_sec(t+1, &minus);
656 if (r < 0)
657 return r;
9a98c7a1 658
48d26c01 659 goto finish;
decad910 660
48d26c01
IK		 661 } else if ((k = endswith(t, " ago"))) {
662 t = strndupa(t, k - t);
decad910 663
48d26c01
IK		 664 r = parse_sec(t, &minus);
665 if (r < 0)
666 return r;
decad910 667
48d26c01 668 goto finish;
1fcf71f5 669
48d26c01
IK		 670 } else if ((k = endswith(t, " left"))) {
671 t = strndupa(t, k - t);
1fcf71f5 672
48d26c01
IK		 673 r = parse_sec(t, &plus);
674 if (r < 0)
675 return r;
1fcf71f5 676
48d26c01
IK		 677 goto finish;
678 }
9a98c7a1 679
48d26c01
IK		 680 /* See if the timestamp is suffixed with UTC */
681 utc = endswith_no_case(t, " UTC");
682 if (utc)
683 t = strndupa(t, utc - t);
684 else {
685 const char *e = NULL;
686 int j;
21b3a0fc 687
48d26c01 688 tzset();
21b3a0fc 689
48d26c01
IK		 690 /* See if the timestamp is suffixed by either the DST or non-DST local timezone. Note that we only
691 * support the local timezones here, nothing else. Not because we wouldn't want to, but simply because
692 * there are no nice APIs available to cover this. By accepting the local time zone strings, we make
693 * sure that all timestamps written by format_timestamp() can be parsed correctly, even though we don't
694 * support arbitrary timezone specifications. */
e4eaf99a 695
48d26c01 696 for (j = 0; j <= 1; j++) {
21b3a0fc 697
48d26c01
IK		 698 if (isempty(tzname[j]))
699 continue;
21b3a0fc 700
48d26c01
IK		 701 e = endswith_no_case(t, tzname[j]);
702 if (!e)
703 continue;
704 if (e == t)
705 continue;
706 if (e[-1] != ' ')
707 continue;
21b3a0fc 708
48d26c01
IK		 709 break;
710 }
21b3a0fc 711
48d26c01
IK		 712 if (IN_SET(j, 0, 1)) {
713 /* Found one of the two timezones specified. */
714 t = strndupa(t, e - t - 1);
715 dst = j;
716 tzn = tzname[j];
717 }
21b3a0fc
LP		 718 }
719 }
720
721 x = (time_t) (ret / USEC_PER_SEC);
e4eaf99a
HV		 722 x_usec = 0;
723
21b3a0fc
LP		 724 if (!localtime_or_gmtime_r(&x, &tm, utc))
725 return -EINVAL;
726
2e72b794
IK		 727 tm.tm_isdst = dst;
728 if (!with_tz && tzn)
729 tm.tm_zone = tzn;
e4eaf99a
HV		 730
731 if (streq(t, "today")) {
732 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
733 goto from_tm;
734
735 } else if (streq(t, "yesterday")) {
313cefa1 736 tm.tm_mday--;
e4eaf99a
HV		 737 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
738 goto from_tm;
739
740 } else if (streq(t, "tomorrow")) {
313cefa1 741 tm.tm_mday++;
e4eaf99a
HV		 742 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
743 goto from_tm;
744 }
745
92134489
LP		 746 for (i = 0; i < ELEMENTSOF(day_nr); i++) {
747 size_t skip;
748
749 if (!startswith_no_case(t, day_nr[i].name))
750 continue;
751
752 skip = strlen(day_nr[i].name);
753 if (t[skip] != ' ')
754 continue;
755
756 weekday = day_nr[i].nr;
757 t += skip + 1;
758 break;
759 }
760
9a98c7a1
LP		 761 copy = tm;
762 k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
e4eaf99a
HV		 763 if (k) {
764 if (*k == '.')
765 goto parse_usec;
766 else if (*k == 0)
767 goto from_tm;
768 }
9a98c7a1
LP		 769
770 tm = copy;
771 k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
e4eaf99a
HV		 772 if (k) {
773 if (*k == '.')
774 goto parse_usec;
775 else if (*k == 0)
776 goto from_tm;
777 }
9a98c7a1
LP		 778
779 tm = copy;
780 k = strptime(t, "%y-%m-%d %H:%M", &tm);
781 if (k && *k == 0) {
782 tm.tm_sec = 0;
e4eaf99a 783 goto from_tm;
9a98c7a1
LP		 784 }
785
786 tm = copy;
787 k = strptime(t, "%Y-%m-%d %H:%M", &tm);
788 if (k && *k == 0) {
789 tm.tm_sec = 0;
e4eaf99a 790 goto from_tm;
9a98c7a1
LP		 791 }
792
793 tm = copy;
794 k = strptime(t, "%y-%m-%d", &tm);
795 if (k && *k == 0) {
796 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
e4eaf99a 797 goto from_tm;
9a98c7a1
LP		 798 }
799
800 tm = copy;
801 k = strptime(t, "%Y-%m-%d", &tm);
802 if (k && *k == 0) {
803 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
e4eaf99a 804 goto from_tm;
9a98c7a1
LP		 805 }
806
807 tm = copy;
808 k = strptime(t, "%H:%M:%S", &tm);
e4eaf99a
HV		 809 if (k) {
810 if (*k == '.')
811 goto parse_usec;
812 else if (*k == 0)
813 goto from_tm;
814 }
9a98c7a1
LP		 815
816 tm = copy;
817 k = strptime(t, "%H:%M", &tm);
818 if (k && *k == 0) {
819 tm.tm_sec = 0;
e4eaf99a 820 goto from_tm;
9a98c7a1
LP		 821 }
822
823 return -EINVAL;
824
e4eaf99a
HV		 825parse_usec:
826 {
436dd70f 827 unsigned add;
e4eaf99a
HV		 828
829 k++;
436dd70f
HV		 830 r = parse_fractional_part_u(&k, 6, &add);
831 if (r < 0)
e4eaf99a
HV		 832 return -EINVAL;
833
436dd70f 834 if (*k)
e4eaf99a
HV		 835 return -EINVAL;
836
436dd70f 837 x_usec = add;
e4eaf99a
HV		 838 }
839
840from_tm:
214cc95d 841 if (weekday >= 0 && tm.tm_wday != weekday)
68bdd2d2 842 return -EINVAL;
9a98c7a1 843
214cc95d
MH		 844 x = mktime_or_timegm(&tm, utc);
845 if (x < 0)
92134489
LP		 846 return -EINVAL;
847
68bdd2d2 848 ret = (usec_t) x * USEC_PER_SEC + x_usec;
1bb4b028
LP		 849 if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX)
850 return -EINVAL;
9a98c7a1 851
e4eaf99a 852finish:
315782db 853 if (ret + plus < ret) /* overflow? */
68bdd2d2 854 return -EINVAL;
9a98c7a1 855 ret += plus;
1bb4b028
LP		 856 if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX)
857 return -EINVAL;
858
68bdd2d2 859 if (ret >= minus)
9a98c7a1
LP		 860 ret -= minus;
861 else
68bdd2d2 862 return -EINVAL;
9a98c7a1
LP		 863
864 *usec = ret;
865
866 return 0;
867}
868
48d26c01
IK		 869typedef struct ParseTimestampResult {
870 usec_t usec;
871 int return_value;
872} ParseTimestampResult;
873
874int parse_timestamp(const char *t, usec_t *usec) {
ff69484a 875 char *last_space, *tz = NULL;
48d26c01 876 ParseTimestampResult *shared, tmp;
4c253ed1 877 int r;
48d26c01
IK		 878
879 last_space = strrchr(t, ' ');
a2932a0d 880 if (last_space != NULL && timezone_is_valid(last_space + 1))
ff69484a 881 tz = last_space + 1;
48d26c01 882
234519ae 883 if (!tz || endswith_no_case(t, " UTC"))
48d26c01
IK		 884 return parse_timestamp_impl(t, usec, false);
885
48d26c01
IK		 886 shared = mmap(NULL, sizeof *shared, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
887 if (shared == MAP_FAILED)
888 return negative_errno();
889
1f5d1e02 890 r = safe_fork("(sd-timestamp)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT, NULL);
4c253ed1 891 if (r < 0) {
48d26c01 892 (void) munmap(shared, sizeof *shared);
4c253ed1 893 return r;
48d26c01 894 }
4c253ed1 895 if (r == 0) {
3fd4929b
MH		 896 bool with_tz = true;
897
ff69484a 898 if (setenv("TZ", tz, 1) != 0) {
48d26c01
IK		 899 shared->return_value = negative_errno();
900 _exit(EXIT_FAILURE);
901 }
902
903 tzset();
904
3fd4929b
MH		 905 /* If there is a timezone that matches the tzname fields, leave the parsing to the implementation.
906 * Otherwise just cut it off */
907 with_tz = !STR_IN_SET(tz, tzname[0], tzname[1]);
908
909 /*cut off the timezone if we dont need it*/
910 if (with_tz)
911 t = strndupa(t, last_space - t);
912
913 shared->return_value = parse_timestamp_impl(t, &shared->usec, with_tz);
48d26c01
IK		 914
915 _exit(EXIT_SUCCESS);
916 }
917
48d26c01
IK		 918 tmp = *shared;
919 if (munmap(shared, sizeof *shared) != 0)
920 return negative_errno();
921
922 if (tmp.return_value == 0)
923 *usec = tmp.usec;
924
925 return tmp.return_value;
926}
927
240a7ba9 928static char* extract_multiplier(char *p, usec_t *multiplier) {
9a98c7a1
LP		 929 static const struct {
930 const char *suffix;
931 usec_t usec;
932 } table[] = {
eb55ec9f
LP		 933 { "seconds", USEC_PER_SEC },
934 { "second", USEC_PER_SEC },
935 { "sec", USEC_PER_SEC },
936 { "s", USEC_PER_SEC },
9a98c7a1 937 { "minutes", USEC_PER_MINUTE },
eb55ec9f
LP		 938 { "minute", USEC_PER_MINUTE },
939 { "min", USEC_PER_MINUTE },
940 { "months", USEC_PER_MONTH },
941 { "month", USEC_PER_MONTH },
942 { "M", USEC_PER_MONTH },
943 { "msec", USEC_PER_MSEC },
944 { "ms", USEC_PER_MSEC },
945 { "m", USEC_PER_MINUTE },
946 { "hours", USEC_PER_HOUR },
947 { "hour", USEC_PER_HOUR },
948 { "hr", USEC_PER_HOUR },
949 { "h", USEC_PER_HOUR },
950 { "days", USEC_PER_DAY },
951 { "day", USEC_PER_DAY },
952 { "d", USEC_PER_DAY },
953 { "weeks", USEC_PER_WEEK },
954 { "week", USEC_PER_WEEK },
955 { "w", USEC_PER_WEEK },
956 { "years", USEC_PER_YEAR },
957 { "year", USEC_PER_YEAR },
958 { "y", USEC_PER_YEAR },
959 { "usec", 1ULL },
960 { "us", 1ULL },
5efdbf11 961 { "µs", 1ULL },
9a98c7a1 962 };
240a7ba9
ZJS		 963 unsigned i;
964
965 for (i = 0; i < ELEMENTSOF(table); i++) {
966 char *e;
967
968 e = startswith(p, table[i].suffix);
969 if (e) {
970 *multiplier = table[i].usec;
971 return e;
972 }
973 }
9a98c7a1 974
240a7ba9
ZJS		 975 return p;
976}
977
978int parse_time(const char *t, usec_t *usec, usec_t default_unit) {
b1d6dcf5 979 const char *p, *s;
9a98c7a1 980 usec_t r = 0;
cb0dac05 981 bool something = false;
9a98c7a1
LP		 982
983 assert(t);
984 assert(usec);
519cffec 985 assert(default_unit > 0);
9a98c7a1
LP		 986
987 p = t;
b1d6dcf5
ZJS		 988
989 p += strspn(p, WHITESPACE);
990 s = startswith(p, "infinity");
991 if (s) {
992 s += strspn(s, WHITESPACE);
993 if (*s != 0)
994 return -EINVAL;
995
996 *usec = USEC_INFINITY;
997 return 0;
998 }
999
cb0dac05
LP		 1000 for (;;) {
1001 long long l, z = 0;
9a98c7a1 1002 char *e;
240a7ba9
ZJS		 1003 unsigned n = 0;
1004 usec_t multiplier = default_unit, k;
cb0dac05
LP		 1005
1006 p += strspn(p, WHITESPACE);
1007
1008 if (*p == 0) {
1009 if (!something)
1010 return -EINVAL;
1011
1012 break;
1013 }
9a98c7a1
LP		 1014
1015 errno = 0;
1016 l = strtoll(p, &e, 10);
8333c77e 1017 if (errno > 0)
9a98c7a1 1018 return -errno;
9a98c7a1
LP		 1019 if (l < 0)
1020 return -ERANGE;
1021
cb0dac05
LP		 1022 if (*e == '.') {
1023 char *b = e + 1;
1024
1025 errno = 0;
1026 z = strtoll(b, &e, 10);
1027 if (errno > 0)
1028 return -errno;
1029
1030 if (z < 0)
1031 return -ERANGE;
1032
1033 if (e == b)
1034 return -EINVAL;
1035
1036 n = e - b;
1037
1038 } else if (e == p)
9a98c7a1
LP		 1039 return -EINVAL;
1040
1041 e += strspn(e, WHITESPACE);
240a7ba9 1042 p = extract_multiplier(e, &multiplier);
9a98c7a1 1043
519cffec
LP		 1044 something = true;
1045
1046 k = (usec_t) z * multiplier;
1047
1048 for (; n > 0; n--)
1049 k /= 10;
1050
1051 r += (usec_t) l * multiplier + k;
cb0dac05 1052 }
9a98c7a1
LP		 1053
1054 *usec = r;
1055
1056 return 0;
1057}
1058
519cffec
LP		 1059int parse_sec(const char *t, usec_t *usec) {
1060 return parse_time(t, usec, USEC_PER_SEC);
1061}
1062
0004f698 1063int parse_sec_fix_0(const char *t, usec_t *usec) {
eae51da3
LP		 1064 assert(t);
1065 assert(usec);
1066
0004f698 1067 t += strspn(t, WHITESPACE);
eae51da3 1068
0004f698
ZJS		 1069 if (streq(t, "0")) {
1070 *usec = USEC_INFINITY;
1071 return 0;
1072 }
1073
1074 return parse_sec(t, usec);
1075}
1076
9a98c7a1
LP		 1077int parse_nsec(const char *t, nsec_t *nsec) {
1078 static const struct {
1079 const char *suffix;
1080 nsec_t nsec;
1081 } table[] = {
1082 { "seconds", NSEC_PER_SEC },
1083 { "second", NSEC_PER_SEC },
1084 { "sec", NSEC_PER_SEC },
1085 { "s", NSEC_PER_SEC },
1086 { "minutes", NSEC_PER_MINUTE },
1087 { "minute", NSEC_PER_MINUTE },
1088 { "min", NSEC_PER_MINUTE },
1089 { "months", NSEC_PER_MONTH },
1090 { "month", NSEC_PER_MONTH },
1091 { "msec", NSEC_PER_MSEC },
1092 { "ms", NSEC_PER_MSEC },
1093 { "m", NSEC_PER_MINUTE },
1094 { "hours", NSEC_PER_HOUR },
1095 { "hour", NSEC_PER_HOUR },
1096 { "hr", NSEC_PER_HOUR },
1097 { "h", NSEC_PER_HOUR },
1098 { "days", NSEC_PER_DAY },
1099 { "day", NSEC_PER_DAY },
1100 { "d", NSEC_PER_DAY },
1101 { "weeks", NSEC_PER_WEEK },
1102 { "week", NSEC_PER_WEEK },
1103 { "w", NSEC_PER_WEEK },
1104 { "years", NSEC_PER_YEAR },
1105 { "year", NSEC_PER_YEAR },
1106 { "y", NSEC_PER_YEAR },
1107 { "usec", NSEC_PER_USEC },
1108 { "us", NSEC_PER_USEC },
5efdbf11 1109 { "µs", NSEC_PER_USEC },
9a98c7a1
LP		 1110 { "nsec", 1ULL },
1111 { "ns", 1ULL },
1112 { "", 1ULL }, /* default is nsec */
1113 };
1114
e73c78c2 1115 const char *p, *s;
9a98c7a1 1116 nsec_t r = 0;
cb0dac05 1117 bool something = false;
9a98c7a1
LP		 1118
1119 assert(t);
1120 assert(nsec);
1121
1122 p = t;
e73c78c2
LP		 1123
1124 p += strspn(p, WHITESPACE);
1125 s = startswith(p, "infinity");
1126 if (s) {
1127 s += strspn(s, WHITESPACE);
8e8933ca 1128 if (*s != 0)
e73c78c2
LP		 1129 return -EINVAL;
1130
1131 *nsec = NSEC_INFINITY;
1132 return 0;
1133 }
1134
cb0dac05
LP		 1135 for (;;) {
1136 long long l, z = 0;
9a98c7a1 1137 char *e;
cb0dac05
LP		 1138 unsigned i, n = 0;
1139
1140 p += strspn(p, WHITESPACE);
1141
1142 if (*p == 0) {
1143 if (!something)
1144 return -EINVAL;
1145
1146 break;
1147 }
9a98c7a1
LP		 1148
1149 errno = 0;
1150 l = strtoll(p, &e, 10);
1151
8333c77e 1152 if (errno > 0)
9a98c7a1
LP		 1153 return -errno;
1154
1155 if (l < 0)
1156 return -ERANGE;
1157
cb0dac05
LP		 1158 if (*e == '.') {
1159 char *b = e + 1;
1160
1161 errno = 0;
1162 z = strtoll(b, &e, 10);
1163 if (errno > 0)
1164 return -errno;
1165
1166 if (z < 0)
1167 return -ERANGE;
1168
1169 if (e == b)
1170 return -EINVAL;
1171
1172 n = e - b;
1173
1174 } else if (e == p)
9a98c7a1
LP		 1175 return -EINVAL;
1176
1177 e += strspn(e, WHITESPACE);
1178
1179 for (i = 0; i < ELEMENTSOF(table); i++)
1180 if (startswith(e, table[i].suffix)) {
cb0dac05
LP		 1181 nsec_t k = (nsec_t) z * table[i].nsec;
1182
1183 for (; n > 0; n--)
1184 k /= 10;
1185
1186 r += (nsec_t) l * table[i].nsec + k;
9a98c7a1 1187 p = e + strlen(table[i].suffix);
cb0dac05
LP		 1188
1189 something = true;
9a98c7a1
LP		 1190 break;
1191 }
1192
1193 if (i >= ELEMENTSOF(table))
1194 return -EINVAL;
1195
cb0dac05 1196 }
9a98c7a1
LP		 1197
1198 *nsec = r;
1199
1200 return 0;
1201}
03cc26dd
LP		 1202
1203bool ntp_synced(void) {
1204 struct timex txc = {};
1205
1206 if (adjtimex(&txc) < 0)
1207 return false;
1208
1209 if (txc.status & STA_UNSYNC)
1210 return false;
1211
1212 return true;
1213}
75683450
LP		 1214
1215int get_timezones(char ***ret) {
1216 _cleanup_fclose_ FILE *f = NULL;
1217 _cleanup_strv_free_ char **zones = NULL;
1218 size_t n_zones = 0, n_allocated = 0;
1219
1220 assert(ret);
1221
1222 zones = strv_new("UTC", NULL);
1223 if (!zones)
1224 return -ENOMEM;
1225
1226 n_allocated = 2;
1227 n_zones = 1;
1228
1229 f = fopen("/usr/share/zoneinfo/zone.tab", "re");
1230 if (f) {
1231 char l[LINE_MAX];
1232
1233 FOREACH_LINE(l, f, return -errno) {
1234 char *p, *w;
1235 size_t k;
1236
1237 p = strstrip(l);
1238
1239 if (isempty(p) || *p == '#')
1240 continue;
1241
1242 /* Skip over country code */
1243 p += strcspn(p, WHITESPACE);
1244 p += strspn(p, WHITESPACE);
1245
1246 /* Skip over coordinates */
1247 p += strcspn(p, WHITESPACE);
1248 p += strspn(p, WHITESPACE);
1249
1250 /* Found timezone name */
1251 k = strcspn(p, WHITESPACE);
1252 if (k <= 0)
1253 continue;
1254
1255 w = strndup(p, k);
1256 if (!w)
1257 return -ENOMEM;
1258
1259 if (!GREEDY_REALLOC(zones, n_allocated, n_zones + 2)) {
1260 free(w);
1261 return -ENOMEM;
1262 }
1263
1264 zones[n_zones++] = w;
1265 zones[n_zones] = NULL;
1266 }
1267
1268 strv_sort(zones);
1269
1270 } else if (errno != ENOENT)
1271 return -errno;
1272
1cc6c93a 1273 *ret = TAKE_PTR(zones);
75683450
LP		 1274
1275 return 0;
1276}
1277
1278bool timezone_is_valid(const char *name) {
1279 bool slash = false;
1280 const char *p, *t;
1281 struct stat st;
1282
5c904ba5
LP		 1283 if (isempty(name))
1284 return false;
1285
1286 if (name[0] == '/')
75683450
LP		 1287 return false;
1288
1289 for (p = name; *p; p++) {
1290 if (!(*p >= '0' && *p <= '9') &&
1291 !(*p >= 'a' && *p <= 'z') &&
1292 !(*p >= 'A' && *p <= 'Z') &&
4c701096 1293 !IN_SET(*p, '-', '_', '+', '/'))
75683450
LP		 1294 return false;
1295
1296 if (*p == '/') {
1297
1298 if (slash)
1299 return false;
1300
1301 slash = true;
1302 } else
1303 slash = false;
1304 }
1305
1306 if (slash)
1307 return false;
1308
63c372cb 1309 t = strjoina("/usr/share/zoneinfo/", name);
75683450
LP		 1310 if (stat(t, &st) < 0)
1311 return false;
1312
1313 if (!S_ISREG(st.st_mode))
1314 return false;
1315
1316 return true;
1317}
77ff2de9 1318
3411372e
LP		 1319bool clock_boottime_supported(void) {
1320 static int supported = -1;
1321
1322 /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */
1323
1324 if (supported < 0) {
1325 int fd;
1326
1327 fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
1328 if (fd < 0)
1329 supported = false;
1330 else {
1331 safe_close(fd);
1332 supported = true;
1333 }
77ff2de9
TG		 1334 }
1335
3411372e
LP		 1336 return supported;
1337}
1338
1339clockid_t clock_boottime_or_monotonic(void) {
1340 if (clock_boottime_supported())
1341 return CLOCK_BOOTTIME;
1342 else
1343 return CLOCK_MONOTONIC;
77ff2de9 1344}
5c904ba5 1345
fe624c4c
LP		 1346bool clock_supported(clockid_t clock) {
1347 struct timespec ts;
1348
1349 switch (clock) {
1350
1351 case CLOCK_MONOTONIC:
1352 case CLOCK_REALTIME:
1353 return true;
1354
1355 case CLOCK_BOOTTIME:
1356 return clock_boottime_supported();
1357
1358 case CLOCK_BOOTTIME_ALARM:
1359 if (!clock_boottime_supported())
1360 return false;
1361
4831981d 1362 _fallthrough_;
fe624c4c
LP		 1363 default:
1364 /* For everything else, check properly */
1365 return clock_gettime(clock, &ts) >= 0;
1366 }
1367}
1368
64d6c229 1369int get_timezone(char **tz) {
5c904ba5
LP		 1370 _cleanup_free_ char *t = NULL;
1371 const char *e;
1372 char *z;
1373 int r;
1374
1375 r = readlink_malloc("/etc/localtime", &t);
1376 if (r < 0)
1377 return r; /* returns EINVAL if not a symlink */
1378
1379 e = path_startswith(t, "/usr/share/zoneinfo/");
1380 if (!e)
1381 e = path_startswith(t, "../usr/share/zoneinfo/");
1382 if (!e)
1383 return -EINVAL;
1384
1385 if (!timezone_is_valid(e))
1386 return -EINVAL;
1387
1388 z = strdup(e);
1389 if (!z)
1390 return -ENOMEM;
1391
64d6c229 1392 *tz = z;
5c904ba5
LP		 1393 return 0;
1394}
7c67c79c
HV		 1395
1396time_t mktime_or_timegm(struct tm *tm, bool utc) {
1397 return utc ? timegm(tm) : mktime(tm);
1398}
1399
1400struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
1401 return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
1402}
87b8ce69
SS		 1403
1404unsigned long usec_to_jiffies(usec_t u) {
1405 static thread_local unsigned long hz = 0;
1406 long r;
1407
1408 if (hz == 0) {
1409 r = sysconf(_SC_CLK_TCK);
1410
1411 assert(r > 0);
70887c5f 1412 hz = r;
87b8ce69
SS		 1413 }
1414
1415 return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
1416}
1007ec60
LP		 1417
1418usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to) {
1419 usec_t a, b;
1420
1421 if (x == USEC_INFINITY)
1422 return USEC_INFINITY;
1423 if (map_clock_id(from) == map_clock_id(to))
1424 return x;
1425
1426 a = now(from);
1427 b = now(to);
1428
1429 if (x > a)
1430 /* x lies in the future */
1431 return usec_add(b, usec_sub_unsigned(x, a));
1432 else
1433 /* x lies in the past */
1434 return usec_sub_unsigned(b, usec_sub_unsigned(a, x));
1435}
9a9a4f10
LP		 1436
1437bool in_utc_timezone(void) {
1438 tzset();
1439
1440 return timezone == 0 && daylight == 0;
1441}
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