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[thirdparty/systemd.git] / src / basic / time-util.c
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9a98c7a1
LP		 1/***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 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 License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18***/
19
11c3a366
TA		 20#include <errno.h>
21#include <limits.h>
22#include <stdlib.h>
9a98c7a1 23#include <string.h>
48d26c01 24#include <sys/mman.h>
11c3a366
TA		 25#include <sys/stat.h>
26#include <sys/time.h>
77ff2de9 27#include <sys/timerfd.h>
07630cea 28#include <sys/timex.h>
11c3a366
TA		 29#include <sys/types.h>
30#include <unistd.h>
9a98c7a1 31
b5efdb8a 32#include "alloc-util.h"
3ffd4af2 33#include "fd-util.h"
0d39fa9c 34#include "fileio.h"
f4f15635 35#include "fs-util.h"
11c3a366
TA		 36#include "log.h"
37#include "macro.h"
93cc7779
TA		 38#include "parse-util.h"
39#include "path-util.h"
07630cea 40#include "string-util.h"
75683450 41#include "strv.h"
07630cea 42#include "time-util.h"
9a98c7a1 43
32c1f5a5
LP		 44static clockid_t map_clock_id(clockid_t c) {
45
46 /* Some more exotic archs (s390, ppc, …) lack the "ALARM" flavour of the clocks. Thus, clock_gettime() will
47 * fail for them. Since they are essentially the same as their non-ALARM pendants (their only difference is
48 * when timers are set on them), let's just map them accordingly. This way, we can get the correct time even on
bdf19f8f 49 * those archs. */
32c1f5a5
LP		 50
51 switch (c) {
52
53 case CLOCK_BOOTTIME_ALARM:
bdf19f8f 54 return CLOCK_BOOTTIME;
32c1f5a5
LP		 55
56 case CLOCK_REALTIME_ALARM:
57 return CLOCK_REALTIME;
58
59 default:
60 return c;
61 }
62}
63
9a98c7a1
LP		 64usec_t now(clockid_t clock_id) {
65 struct timespec ts;
66
32c1f5a5 67 assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0);
9a98c7a1
LP		 68
69 return timespec_load(&ts);
70}
71
45d7a8bb
LP		 72nsec_t now_nsec(clockid_t clock_id) {
73 struct timespec ts;
74
32c1f5a5 75 assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0);
45d7a8bb
LP		 76
77 return timespec_load_nsec(&ts);
78}
79
9a98c7a1
LP		 80dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
81 assert(ts);
82
83 ts->realtime = now(CLOCK_REALTIME);
84 ts->monotonic = now(CLOCK_MONOTONIC);
85
86 return ts;
87}
88
fe624c4c
LP		 89triple_timestamp* triple_timestamp_get(triple_timestamp *ts) {
90 assert(ts);
91
92 ts->realtime = now(CLOCK_REALTIME);
93 ts->monotonic = now(CLOCK_MONOTONIC);
94 ts->boottime = clock_boottime_supported() ? now(CLOCK_BOOTTIME) : USEC_INFINITY;
95
96 return ts;
97}
98
9a98c7a1
LP		 99dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
100 int64_t delta;
101 assert(ts);
102
75a5f1d8
LP		 103 if (u == USEC_INFINITY || u <= 0) {
104 ts->realtime = ts->monotonic = u;
cae0c5e0
LP		 105 return ts;
106 }
107
9a98c7a1
LP		 108 ts->realtime = u;
109
75a5f1d8 110 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
54d8ef14 111 ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
9a98c7a1
LP		 112
113 return ts;
114}
115
fe624c4c
LP		 116triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u) {
117 int64_t delta;
118
119 assert(ts);
120
121 if (u == USEC_INFINITY || u <= 0) {
122 ts->realtime = ts->monotonic = ts->boottime = u;
123 return ts;
124 }
125
126 ts->realtime = u;
127 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
54d8ef14
LP		 128 ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
129 ts->boottime = clock_boottime_supported() ? usec_sub_signed(now(CLOCK_BOOTTIME), delta) : USEC_INFINITY;
fe624c4c
LP		 130
131 return ts;
132}
133
cae0c5e0
LP		 134dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
135 int64_t delta;
136 assert(ts);
137
3a43da28
KS		 138 if (u == USEC_INFINITY) {
139 ts->realtime = ts->monotonic = USEC_INFINITY;
cae0c5e0
LP		 140 return ts;
141 }
142
143 ts->monotonic = u;
144 delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
54d8ef14 145 ts->realtime = usec_sub_signed(now(CLOCK_REALTIME), delta);
cae0c5e0
LP		 146
147 return ts;
148}
149
fbe55073
LP		 150dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u) {
151 int64_t delta;
152
153 if (u == USEC_INFINITY) {
154 ts->realtime = ts->monotonic = USEC_INFINITY;
155 return ts;
156 }
fbe55073 157
0345d252 158 dual_timestamp_get(ts);
fbe55073 159 delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
54d8ef14
LP		 160 ts->realtime = usec_sub_signed(ts->realtime, delta);
161 ts->monotonic = usec_sub_signed(ts->monotonic, delta);
fbe55073
LP		 162
163 return ts;
164}
165
fe624c4c
LP		 166usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock) {
167
168 switch (clock) {
169
170 case CLOCK_REALTIME:
171 case CLOCK_REALTIME_ALARM:
172 return ts->realtime;
173
174 case CLOCK_MONOTONIC:
175 return ts->monotonic;
176
177 case CLOCK_BOOTTIME:
178 case CLOCK_BOOTTIME_ALARM:
179 return ts->boottime;
180
181 default:
182 return USEC_INFINITY;
183 }
184}
185
9a98c7a1
LP		 186usec_t timespec_load(const struct timespec *ts) {
187 assert(ts);
188
c477ff14 189 if (ts->tv_sec < 0 || ts->tv_nsec < 0)
3a43da28 190 return USEC_INFINITY;
9a98c7a1
LP		 191
192 if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
3a43da28 193 return USEC_INFINITY;
9a98c7a1
LP		 194
195 return
196 (usec_t) ts->tv_sec * USEC_PER_SEC +
197 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
198}
199
3a730176 200nsec_t timespec_load_nsec(const struct timespec *ts) {
45d7a8bb
LP		 201 assert(ts);
202
c477ff14 203 if (ts->tv_sec < 0 || ts->tv_nsec < 0)
45d7a8bb
LP		 204 return NSEC_INFINITY;
205
a2daa2f0
ZJS		 206 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
207 return NSEC_INFINITY;
208
209 return (nsec_t) ts->tv_sec * NSEC_PER_SEC + (nsec_t) ts->tv_nsec;
45d7a8bb
LP		 210}
211
9a98c7a1
LP		 212struct timespec *timespec_store(struct timespec *ts, usec_t u) {
213 assert(ts);
214
f977849c 215 if (u == USEC_INFINITY ||
d201d908 216 u / USEC_PER_SEC >= TIME_T_MAX) {
9a98c7a1
LP		 217 ts->tv_sec = (time_t) -1;
218 ts->tv_nsec = (long) -1;
219 return ts;
220 }
221
222 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
223 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
224
225 return ts;
226}
227
228usec_t timeval_load(const struct timeval *tv) {
229 assert(tv);
230
c477ff14 231 if (tv->tv_sec < 0 || tv->tv_usec < 0)
3a43da28 232 return USEC_INFINITY;
9a98c7a1
LP		 233
234 if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC)
3a43da28 235 return USEC_INFINITY;
9a98c7a1
LP		 236
237 return
238 (usec_t) tv->tv_sec * USEC_PER_SEC +
239 (usec_t) tv->tv_usec;
240}
241
242struct timeval *timeval_store(struct timeval *tv, usec_t u) {
243 assert(tv);
244
68bdd2d2 245 if (u == USEC_INFINITY ||
f977849c 246 u / USEC_PER_SEC > TIME_T_MAX) {
9a98c7a1
LP		 247 tv->tv_sec = (time_t) -1;
248 tv->tv_usec = (suseconds_t) -1;
4d89874a
ZJS		 249 } else {
250 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
251 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
9a98c7a1
LP		 252 }
253
9a98c7a1
LP		 254 return tv;
255}
256
21b3a0fc
LP		 257static char *format_timestamp_internal(
258 char *buf,
259 size_t l,
260 usec_t t,
261 bool utc,
262 bool us) {
263
264 /* The weekdays in non-localized (English) form. We use this instead of the localized form, so that our
265 * generated timestamps may be parsed with parse_timestamp(), and always read the same. */
266 static const char * const weekdays[] = {
267 [0] = "Sun",
268 [1] = "Mon",
269 [2] = "Tue",
270 [3] = "Wed",
271 [4] = "Thu",
272 [5] = "Fri",
273 [6] = "Sat",
274 };
275
9a98c7a1
LP		 276 struct tm tm;
277 time_t sec;
21b3a0fc 278 size_t n;
9a98c7a1
LP		 279
280 assert(buf);
9a98c7a1 281
21b3a0fc
LP		 282 if (l <
283 3 + /* week day */
284 1 + 10 + /* space and date */
285 1 + 8 + /* space and time */
286 (us ? 1 + 6 : 0) + /* "." and microsecond part */
287 1 + 1 + /* space and shortest possible zone */
288 1)
289 return NULL; /* Not enough space even for the shortest form. */
3a43da28 290 if (t <= 0 || t == USEC_INFINITY)
21b3a0fc
LP		 291 return NULL; /* Timestamp is unset */
292
1bb4b028
LP		 293 /* Let's not format times with years > 9999 */
294 if (t > USEC_TIMESTAMP_FORMATTABLE_MAX)
295 return NULL;
296
21b3a0fc 297 sec = (time_t) (t / USEC_PER_SEC); /* Round down */
21b3a0fc
LP		 298
299 if (!localtime_or_gmtime_r(&sec, &tm, utc))
9a98c7a1
LP		 300 return NULL;
301
21b3a0fc
LP		 302 /* Start with the week day */
303 assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays));
304 memcpy(buf, weekdays[tm.tm_wday], 4);
9a98c7a1 305
21b3a0fc
LP		 306 /* Add the main components */
307 if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0)
308 return NULL; /* Doesn't fit */
0056086a 309
21b3a0fc 310 /* Append the microseconds part, if that's requested */
0056086a 311 if (us) {
21b3a0fc
LP		 312 n = strlen(buf);
313 if (n + 8 > l)
314 return NULL; /* Microseconds part doesn't fit. */
315
70887c5f 316 sprintf(buf + n, ".%06"PRI_USEC, t % USEC_PER_SEC);
21b3a0fc
LP		 317 }
318
319 /* Append the timezone */
320 n = strlen(buf);
321 if (utc) {
322 /* If this is UTC then let's explicitly use the "UTC" string here, because gmtime_r() normally uses the
323 * obsolete "GMT" instead. */
324 if (n + 5 > l)
325 return NULL; /* "UTC" doesn't fit. */
326
327 strcpy(buf + n, " UTC");
328
329 } else if (!isempty(tm.tm_zone)) {
330 size_t tn;
331
332 /* An explicit timezone is specified, let's use it, if it fits */
333 tn = strlen(tm.tm_zone);
334 if (n + 1 + tn + 1 > l) {
335 /* The full time zone does not fit in. Yuck. */
336
337 if (n + 1 + _POSIX_TZNAME_MAX + 1 > l)
338 return NULL; /* Not even enough space for the POSIX minimum (of 6)? In that case, complain that it doesn't fit */
339
340 /* So the time zone doesn't fit in fully, but the caller passed enough space for the POSIX
341 * minimum time zone length. In this case suppress the timezone entirely, in order not to dump
342 * an overly long, hard to read string on the user. This should be safe, because the user will
343 * assume the local timezone anyway if none is shown. And so does parse_timestamp(). */
344 } else {
345 buf[n++] = ' ';
346 strcpy(buf + n, tm.tm_zone);
347 }
0056086a 348 }
9a98c7a1
LP		 349
350 return buf;
351}
352
a62e83b4 353char *format_timestamp(char *buf, size_t l, usec_t t) {
0056086a 354 return format_timestamp_internal(buf, l, t, false, false);
a62e83b4
JS		 355}
356
5ab99e07 357char *format_timestamp_utc(char *buf, size_t l, usec_t t) {
0056086a 358 return format_timestamp_internal(buf, l, t, true, false);
f02d8367
ZJS		 359}
360
5ab99e07 361char *format_timestamp_us(char *buf, size_t l, usec_t t) {
0056086a 362 return format_timestamp_internal(buf, l, t, false, true);
5ab99e07
LP		 363}
364
365char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {
0056086a 366 return format_timestamp_internal(buf, l, t, true, true);
5ab99e07
LP		 367}
368
bbb8486e 369char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
1fcf71f5 370 const char *s;
9a98c7a1
LP		 371 usec_t n, d;
372
65de0395 373 if (t <= 0 || t == USEC_INFINITY)
9a98c7a1
LP		 374 return NULL;
375
65de0395 376 n = now(CLOCK_REALTIME);
1fcf71f5
LP		 377 if (n > t) {
378 d = n - t;
379 s = "ago";
380 } else {
381 d = t - n;
382 s = "left";
383 }
9a98c7a1
LP		 384
385 if (d >= USEC_PER_YEAR)
609e002e 386 snprintf(buf, l, USEC_FMT " years " USEC_FMT " months %s",
de0671ee
ZJS		 387 d / USEC_PER_YEAR,
388 (d % USEC_PER_YEAR) / USEC_PER_MONTH, s);
9a98c7a1 389 else if (d >= USEC_PER_MONTH)
609e002e 390 snprintf(buf, l, USEC_FMT " months " USEC_FMT " days %s",
de0671ee
ZJS		 391 d / USEC_PER_MONTH,
392 (d % USEC_PER_MONTH) / USEC_PER_DAY, s);
9a98c7a1 393 else if (d >= USEC_PER_WEEK)
609e002e 394 snprintf(buf, l, USEC_FMT " weeks " USEC_FMT " days %s",
de0671ee
ZJS		 395 d / USEC_PER_WEEK,
396 (d % USEC_PER_WEEK) / USEC_PER_DAY, s);
9a98c7a1 397 else if (d >= 2*USEC_PER_DAY)
609e002e 398 snprintf(buf, l, USEC_FMT " days %s", d / USEC_PER_DAY, s);
9a98c7a1 399 else if (d >= 25*USEC_PER_HOUR)
609e002e 400 snprintf(buf, l, "1 day " USEC_FMT "h %s",
de0671ee 401 (d - USEC_PER_DAY) / USEC_PER_HOUR, s);
9a98c7a1 402 else if (d >= 6*USEC_PER_HOUR)
609e002e 403 snprintf(buf, l, USEC_FMT "h %s",
de0671ee 404 d / USEC_PER_HOUR, s);
9a98c7a1 405 else if (d >= USEC_PER_HOUR)
609e002e 406 snprintf(buf, l, USEC_FMT "h " USEC_FMT "min %s",
de0671ee
ZJS		 407 d / USEC_PER_HOUR,
408 (d % USEC_PER_HOUR) / USEC_PER_MINUTE, s);
9a98c7a1 409 else if (d >= 5*USEC_PER_MINUTE)
609e002e 410 snprintf(buf, l, USEC_FMT "min %s",
de0671ee 411 d / USEC_PER_MINUTE, s);
9a98c7a1 412 else if (d >= USEC_PER_MINUTE)
609e002e 413 snprintf(buf, l, USEC_FMT "min " USEC_FMT "s %s",
de0671ee
ZJS		 414 d / USEC_PER_MINUTE,
415 (d % USEC_PER_MINUTE) / USEC_PER_SEC, s);
9a98c7a1 416 else if (d >= USEC_PER_SEC)
609e002e 417 snprintf(buf, l, USEC_FMT "s %s",
de0671ee 418 d / USEC_PER_SEC, s);
9a98c7a1 419 else if (d >= USEC_PER_MSEC)
609e002e 420 snprintf(buf, l, USEC_FMT "ms %s",
de0671ee 421 d / USEC_PER_MSEC, s);
9a98c7a1 422 else if (d > 0)
de0671ee
ZJS		 423 snprintf(buf, l, USEC_FMT"us %s",
424 d, s);
9a98c7a1
LP		 425 else
426 snprintf(buf, l, "now");
427
428 buf[l-1] = 0;
429 return buf;
430}
431
2fa4092c 432char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
9a98c7a1
LP		 433 static const struct {
434 const char *suffix;
435 usec_t usec;
436 } table[] = {
eb55ec9f
LP		 437 { "y", USEC_PER_YEAR },
438 { "month", USEC_PER_MONTH },
439 { "w", USEC_PER_WEEK },
440 { "d", USEC_PER_DAY },
441 { "h", USEC_PER_HOUR },
442 { "min", USEC_PER_MINUTE },
443 { "s", USEC_PER_SEC },
444 { "ms", USEC_PER_MSEC },
445 { "us", 1 },
9a98c7a1
LP		 446 };
447
448 unsigned i;
449 char *p = buf;
2fa4092c 450 bool something = false;
9a98c7a1
LP		 451
452 assert(buf);
453 assert(l > 0);
454
bb1fada8
LP		 455 if (t == USEC_INFINITY) {
456 strncpy(p, "infinity", l-1);
457 p[l-1] = 0;
458 return p;
459 }
460
461 if (t <= 0) {
462 strncpy(p, "0", l-1);
7c537b2e
LP		 463 p[l-1] = 0;
464 return p;
465 }
466
7f602784 467 /* The result of this function can be parsed with parse_sec */
9a98c7a1
LP		 468
469 for (i = 0; i < ELEMENTSOF(table); i++) {
7759ecb2 470 int k = 0;
9a98c7a1 471 size_t n;
2fa4092c
LP		 472 bool done = false;
473 usec_t a, b;
474
7c537b2e
LP		 475 if (t <= 0)
476 break;
2fa4092c 477
7c537b2e 478 if (t < accuracy && something)
2fa4092c 479 break;
9a98c7a1
LP		 480
481 if (t < table[i].usec)
482 continue;
483
484 if (l <= 1)
485 break;
486
2fa4092c
LP		 487 a = t / table[i].usec;
488 b = t % table[i].usec;
489
490 /* Let's see if we should shows this in dot notation */
491 if (t < USEC_PER_MINUTE && b > 0) {
492 usec_t cc;
493 int j;
494
495 j = 0;
496 for (cc = table[i].usec; cc > 1; cc /= 10)
497 j++;
498
499 for (cc = accuracy; cc > 1; cc /= 10) {
500 b /= 10;
501 j--;
502 }
503
504 if (j > 0) {
505 k = snprintf(p, l,
70887c5f 506 "%s"USEC_FMT".%0*"PRI_USEC"%s",
2fa4092c 507 p > buf ? " " : "",
de0671ee 508 a,
2fa4092c 509 j,
70887c5f 510 b,
2fa4092c
LP		 511 table[i].suffix);
512
513 t = 0;
514 done = true;
515 }
516 }
517
518 /* No? Then let's show it normally */
519 if (!done) {
520 k = snprintf(p, l,
de0671ee 521 "%s"USEC_FMT"%s",
2fa4092c 522 p > buf ? " " : "",
de0671ee 523 a,
2fa4092c
LP		 524 table[i].suffix);
525
526 t = b;
527 }
528
9a98c7a1
LP		 529 n = MIN((size_t) k, l);
530
531 l -= n;
532 p += n;
533
2fa4092c 534 something = true;
9a98c7a1
LP		 535 }
536
537 *p = 0;
538
539 return buf;
540}
541
542void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
543
544 assert(f);
545 assert(name);
546 assert(t);
547
548 if (!dual_timestamp_is_set(t))
549 return;
550
de0671ee 551 fprintf(f, "%s="USEC_FMT" "USEC_FMT"\n",
9a98c7a1 552 name,
de0671ee
ZJS		 553 t->realtime,
554 t->monotonic);
9a98c7a1
LP		 555}
556
e911de99 557int dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
74c5b33b 558 uint64_t a, b;
9c0565b2 559 int r, pos;
9a98c7a1
LP		 560
561 assert(value);
562 assert(t);
563
9c0565b2
ZJS		 564 pos = strspn(value, WHITESPACE);
565 if (value[pos] == '-')
566 return -EINVAL;
567 pos += strspn(value + pos, DIGITS);
568 pos += strspn(value + pos, WHITESPACE);
569 if (value[pos] == '-')
570 return -EINVAL;
571
572 r = sscanf(value, "%" PRIu64 "%" PRIu64 "%n", &a, &b, &pos);
573 if (r != 2) {
574 log_debug("Failed to parse dual timestamp value \"%s\".", value);
e911de99 575 return -EINVAL;
9a98c7a1 576 }
e911de99 577
9c0565b2
ZJS		 578 if (value[pos] != '\0')
579 /* trailing garbage */
580 return -EINVAL;
581
e911de99
LP		 582 t->realtime = a;
583 t->monotonic = b;
584
585 return 0;
9a98c7a1
LP		 586}
587
b895a735 588int timestamp_deserialize(const char *value, usec_t *timestamp) {
ebf30a08
AK		 589 int r;
590
591 assert(value);
592
593 r = safe_atou64(value, timestamp);
ebf30a08 594 if (r < 0)
b895a735 595 return log_debug_errno(r, "Failed to parse timestamp value \"%s\": %m", value);
ebf30a08
AK		 596
597 return r;
598}
599
48d26c01 600static int parse_timestamp_impl(const char *t, usec_t *usec, bool with_tz) {
92134489
LP		 601 static const struct {
602 const char *name;
603 const int nr;
604 } day_nr[] = {
605 { "Sunday", 0 },
606 { "Sun", 0 },
607 { "Monday", 1 },
608 { "Mon", 1 },
609 { "Tuesday", 2 },
610 { "Tue", 2 },
611 { "Wednesday", 3 },
612 { "Wed", 3 },
613 { "Thursday", 4 },
614 { "Thu", 4 },
615 { "Friday", 5 },
616 { "Fri", 5 },
617 { "Saturday", 6 },
618 { "Sat", 6 },
619 };
620
48d26c01 621 const char *k, *utc = NULL, *tzn = NULL;
9a98c7a1
LP		 622 struct tm tm, copy;
623 time_t x;
e4eaf99a 624 usec_t x_usec, plus = 0, minus = 0, ret;
21b3a0fc 625 int r, weekday = -1, dst = -1;
92134489 626 unsigned i;
9a98c7a1
LP		 627
628 /*
629 * Allowed syntaxes:
630 *
631 * 2012-09-22 16:34:22
632 * 2012-09-22 16:34 (seconds will be set to 0)
633 * 2012-09-22 (time will be set to 00:00:00)
634 * 16:34:22 (date will be set to today)
635 * 16:34 (date will be set to today, seconds to 0)
636 * now
637 * yesterday (time is set to 00:00:00)
638 * today (time is set to 00:00:00)
639 * tomorrow (time is set to 00:00:00)
640 * +5min
641 * -5days
5ba6e094 642 * @2147483647 (seconds since epoch)
9a98c7a1
LP		 643 *
644 */
645
646 assert(t);
647 assert(usec);
648
48d26c01 649 if (t[0] == '@' && !with_tz)
e4eaf99a 650 return parse_sec(t + 1, usec);
9a98c7a1 651
e4eaf99a 652 ret = now(CLOCK_REALTIME);
9a98c7a1 653
48d26c01
IK		 654 if (!with_tz) {
655 if (streq(t, "now"))
656 goto finish;
9a98c7a1 657
48d26c01
IK		 658 else if (t[0] == '+') {
659 r = parse_sec(t+1, &plus);
660 if (r < 0)
661 return r;
9a98c7a1 662
48d26c01 663 goto finish;
9a98c7a1 664
48d26c01
IK		 665 } else if (t[0] == '-') {
666 r = parse_sec(t+1, &minus);
667 if (r < 0)
668 return r;
9a98c7a1 669
48d26c01 670 goto finish;
decad910 671
48d26c01
IK		 672 } else if ((k = endswith(t, " ago"))) {
673 t = strndupa(t, k - t);
decad910 674
48d26c01
IK		 675 r = parse_sec(t, &minus);
676 if (r < 0)
677 return r;
decad910 678
48d26c01 679 goto finish;
1fcf71f5 680
48d26c01
IK		 681 } else if ((k = endswith(t, " left"))) {
682 t = strndupa(t, k - t);
1fcf71f5 683
48d26c01
IK		 684 r = parse_sec(t, &plus);
685 if (r < 0)
686 return r;
1fcf71f5 687
48d26c01
IK		 688 goto finish;
689 }
9a98c7a1 690
48d26c01
IK		 691 /* See if the timestamp is suffixed with UTC */
692 utc = endswith_no_case(t, " UTC");
693 if (utc)
694 t = strndupa(t, utc - t);
695 else {
696 const char *e = NULL;
697 int j;
21b3a0fc 698
48d26c01 699 tzset();
21b3a0fc 700
48d26c01
IK		 701 /* See if the timestamp is suffixed by either the DST or non-DST local timezone. Note that we only
702 * support the local timezones here, nothing else. Not because we wouldn't want to, but simply because
703 * there are no nice APIs available to cover this. By accepting the local time zone strings, we make
704 * sure that all timestamps written by format_timestamp() can be parsed correctly, even though we don't
705 * support arbitrary timezone specifications. */
e4eaf99a 706
48d26c01 707 for (j = 0; j <= 1; j++) {
21b3a0fc 708
48d26c01
IK		 709 if (isempty(tzname[j]))
710 continue;
21b3a0fc 711
48d26c01
IK		 712 e = endswith_no_case(t, tzname[j]);
713 if (!e)
714 continue;
715 if (e == t)
716 continue;
717 if (e[-1] != ' ')
718 continue;
21b3a0fc 719
48d26c01
IK		 720 break;
721 }
21b3a0fc 722
48d26c01
IK		 723 if (IN_SET(j, 0, 1)) {
724 /* Found one of the two timezones specified. */
725 t = strndupa(t, e - t - 1);
726 dst = j;
727 tzn = tzname[j];
728 }
21b3a0fc
LP		 729 }
730 }
731
732 x = (time_t) (ret / USEC_PER_SEC);
e4eaf99a
HV		 733 x_usec = 0;
734
21b3a0fc
LP		 735 if (!localtime_or_gmtime_r(&x, &tm, utc))
736 return -EINVAL;
737
48d26c01
IK		 738 if (!with_tz) {
739 tm.tm_isdst = dst;
740 if (tzn)
741 tm.tm_zone = tzn;
742 }
e4eaf99a
HV		 743
744 if (streq(t, "today")) {
745 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
746 goto from_tm;
747
748 } else if (streq(t, "yesterday")) {
313cefa1 749 tm.tm_mday--;
e4eaf99a
HV		 750 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
751 goto from_tm;
752
753 } else if (streq(t, "tomorrow")) {
313cefa1 754 tm.tm_mday++;
e4eaf99a
HV		 755 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
756 goto from_tm;
757 }
758
92134489
LP		 759 for (i = 0; i < ELEMENTSOF(day_nr); i++) {
760 size_t skip;
761
762 if (!startswith_no_case(t, day_nr[i].name))
763 continue;
764
765 skip = strlen(day_nr[i].name);
766 if (t[skip] != ' ')
767 continue;
768
769 weekday = day_nr[i].nr;
770 t += skip + 1;
771 break;
772 }
773
9a98c7a1
LP		 774 copy = tm;
775 k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
e4eaf99a
HV		 776 if (k) {
777 if (*k == '.')
778 goto parse_usec;
779 else if (*k == 0)
780 goto from_tm;
781 }
9a98c7a1
LP		 782
783 tm = copy;
784 k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
e4eaf99a
HV		 785 if (k) {
786 if (*k == '.')
787 goto parse_usec;
788 else if (*k == 0)
789 goto from_tm;
790 }
9a98c7a1
LP		 791
792 tm = copy;
793 k = strptime(t, "%y-%m-%d %H:%M", &tm);
794 if (k && *k == 0) {
795 tm.tm_sec = 0;
e4eaf99a 796 goto from_tm;
9a98c7a1
LP		 797 }
798
799 tm = copy;
800 k = strptime(t, "%Y-%m-%d %H:%M", &tm);
801 if (k && *k == 0) {
802 tm.tm_sec = 0;
e4eaf99a 803 goto from_tm;
9a98c7a1
LP		 804 }
805
806 tm = copy;
807 k = strptime(t, "%y-%m-%d", &tm);
808 if (k && *k == 0) {
809 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
e4eaf99a 810 goto from_tm;
9a98c7a1
LP		 811 }
812
813 tm = copy;
814 k = strptime(t, "%Y-%m-%d", &tm);
815 if (k && *k == 0) {
816 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
e4eaf99a 817 goto from_tm;
9a98c7a1
LP		 818 }
819
820 tm = copy;
821 k = strptime(t, "%H:%M:%S", &tm);
e4eaf99a
HV		 822 if (k) {
823 if (*k == '.')
824 goto parse_usec;
825 else if (*k == 0)
826 goto from_tm;
827 }
9a98c7a1
LP		 828
829 tm = copy;
830 k = strptime(t, "%H:%M", &tm);
831 if (k && *k == 0) {
832 tm.tm_sec = 0;
e4eaf99a 833 goto from_tm;
9a98c7a1
LP		 834 }
835
836 return -EINVAL;
837
e4eaf99a
HV		 838parse_usec:
839 {
436dd70f 840 unsigned add;
e4eaf99a
HV		 841
842 k++;
436dd70f
HV		 843 r = parse_fractional_part_u(&k, 6, &add);
844 if (r < 0)
e4eaf99a
HV		 845 return -EINVAL;
846
436dd70f 847 if (*k)
e4eaf99a
HV		 848 return -EINVAL;
849
436dd70f 850 x_usec = add;
e4eaf99a
HV		 851 }
852
853from_tm:
854 x = mktime_or_timegm(&tm, utc);
68bdd2d2
YW		 855 if (x < 0)
856 return -EINVAL;
9a98c7a1 857
92134489
LP		 858 if (weekday >= 0 && tm.tm_wday != weekday)
859 return -EINVAL;
860
68bdd2d2 861 ret = (usec_t) x * USEC_PER_SEC + x_usec;
1bb4b028
LP		 862 if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX)
863 return -EINVAL;
9a98c7a1 864
e4eaf99a 865finish:
315782db 866 if (ret + plus < ret) /* overflow? */
68bdd2d2 867 return -EINVAL;
9a98c7a1 868 ret += plus;
1bb4b028
LP		 869 if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX)
870 return -EINVAL;
871
68bdd2d2 872 if (ret >= minus)
9a98c7a1
LP		 873 ret -= minus;
874 else
68bdd2d2 875 return -EINVAL;
9a98c7a1
LP		 876
877 *usec = ret;
878
879 return 0;
880}
881
48d26c01
IK		 882typedef struct ParseTimestampResult {
883 usec_t usec;
884 int return_value;
885} ParseTimestampResult;
886
887int parse_timestamp(const char *t, usec_t *usec) {
888 char *last_space, *timezone = NULL;
889 ParseTimestampResult *shared, tmp;
890 int r;
891 pid_t pid;
892
893 last_space = strrchr(t, ' ');
a2932a0d
ZJS		 894 if (last_space != NULL && timezone_is_valid(last_space + 1))
895 timezone = last_space + 1;
48d26c01
IK		 896
897 if (timezone == NULL || endswith_no_case(t, " UTC"))
898 return parse_timestamp_impl(t, usec, false);
899
900 t = strndupa(t, last_space - t);
901
902 shared = mmap(NULL, sizeof *shared, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
903 if (shared == MAP_FAILED)
904 return negative_errno();
905
906 pid = fork();
907
908 if (pid == -1) {
909 int fork_errno = errno;
910 (void) munmap(shared, sizeof *shared);
911 return -fork_errno;
912 }
913
914 if (pid == 0) {
915 if (setenv("TZ", timezone, 1) != 0) {
916 shared->return_value = negative_errno();
917 _exit(EXIT_FAILURE);
918 }
919
920 tzset();
921
922 shared->return_value = parse_timestamp_impl(t, &shared->usec, true);
923
924 _exit(EXIT_SUCCESS);
925 }
926
927 r = wait_for_terminate(pid, NULL);
928 if (r < 0) {
929 (void) munmap(shared, sizeof *shared);
930 return r;
931 }
932
933 tmp = *shared;
934 if (munmap(shared, sizeof *shared) != 0)
935 return negative_errno();
936
937 if (tmp.return_value == 0)
938 *usec = tmp.usec;
939
940 return tmp.return_value;
941}
942
240a7ba9 943static char* extract_multiplier(char *p, usec_t *multiplier) {
9a98c7a1
LP		 944 static const struct {
945 const char *suffix;
946 usec_t usec;
947 } table[] = {
eb55ec9f
LP		 948 { "seconds", USEC_PER_SEC },
949 { "second", USEC_PER_SEC },
950 { "sec", USEC_PER_SEC },
951 { "s", USEC_PER_SEC },
9a98c7a1 952 { "minutes", USEC_PER_MINUTE },
eb55ec9f
LP		 953 { "minute", USEC_PER_MINUTE },
954 { "min", USEC_PER_MINUTE },
955 { "months", USEC_PER_MONTH },
956 { "month", USEC_PER_MONTH },
957 { "M", USEC_PER_MONTH },
958 { "msec", USEC_PER_MSEC },
959 { "ms", USEC_PER_MSEC },
960 { "m", USEC_PER_MINUTE },
961 { "hours", USEC_PER_HOUR },
962 { "hour", USEC_PER_HOUR },
963 { "hr", USEC_PER_HOUR },
964 { "h", USEC_PER_HOUR },
965 { "days", USEC_PER_DAY },
966 { "day", USEC_PER_DAY },
967 { "d", USEC_PER_DAY },
968 { "weeks", USEC_PER_WEEK },
969 { "week", USEC_PER_WEEK },
970 { "w", USEC_PER_WEEK },
971 { "years", USEC_PER_YEAR },
972 { "year", USEC_PER_YEAR },
973 { "y", USEC_PER_YEAR },
974 { "usec", 1ULL },
975 { "us", 1ULL },
5efdbf11 976 { "µs", 1ULL },
9a98c7a1 977 };
240a7ba9
ZJS		 978 unsigned i;
979
980 for (i = 0; i < ELEMENTSOF(table); i++) {
981 char *e;
982
983 e = startswith(p, table[i].suffix);
984 if (e) {
985 *multiplier = table[i].usec;
986 return e;
987 }
988 }
9a98c7a1 989
240a7ba9
ZJS		 990 return p;
991}
992
993int parse_time(const char *t, usec_t *usec, usec_t default_unit) {
b1d6dcf5 994 const char *p, *s;
9a98c7a1 995 usec_t r = 0;
cb0dac05 996 bool something = false;
9a98c7a1
LP		 997
998 assert(t);
999 assert(usec);
519cffec 1000 assert(default_unit > 0);
9a98c7a1
LP		 1001
1002 p = t;
b1d6dcf5
ZJS		 1003
1004 p += strspn(p, WHITESPACE);
1005 s = startswith(p, "infinity");
1006 if (s) {
1007 s += strspn(s, WHITESPACE);
1008 if (*s != 0)
1009 return -EINVAL;
1010
1011 *usec = USEC_INFINITY;
1012 return 0;
1013 }
1014
cb0dac05
LP		 1015 for (;;) {
1016 long long l, z = 0;
9a98c7a1 1017 char *e;
240a7ba9
ZJS		 1018 unsigned n = 0;
1019 usec_t multiplier = default_unit, k;
cb0dac05
LP		 1020
1021 p += strspn(p, WHITESPACE);
1022
1023 if (*p == 0) {
1024 if (!something)
1025 return -EINVAL;
1026
1027 break;
1028 }
9a98c7a1
LP		 1029
1030 errno = 0;
1031 l = strtoll(p, &e, 10);
8333c77e 1032 if (errno > 0)
9a98c7a1 1033 return -errno;
9a98c7a1
LP		 1034 if (l < 0)
1035 return -ERANGE;
1036
cb0dac05
LP		 1037 if (*e == '.') {
1038 char *b = e + 1;
1039
1040 errno = 0;
1041 z = strtoll(b, &e, 10);
1042 if (errno > 0)
1043 return -errno;
1044
1045 if (z < 0)
1046 return -ERANGE;
1047
1048 if (e == b)
1049 return -EINVAL;
1050
1051 n = e - b;
1052
1053 } else if (e == p)
9a98c7a1
LP		 1054 return -EINVAL;
1055
1056 e += strspn(e, WHITESPACE);
240a7ba9 1057 p = extract_multiplier(e, &multiplier);
9a98c7a1 1058
519cffec
LP		 1059 something = true;
1060
1061 k = (usec_t) z * multiplier;
1062
1063 for (; n > 0; n--)
1064 k /= 10;
1065
1066 r += (usec_t) l * multiplier + k;
cb0dac05 1067 }
9a98c7a1
LP		 1068
1069 *usec = r;
1070
1071 return 0;
1072}
1073
519cffec
LP		 1074int parse_sec(const char *t, usec_t *usec) {
1075 return parse_time(t, usec, USEC_PER_SEC);
1076}
1077
0004f698
ZJS		 1078int parse_sec_fix_0(const char *t, usec_t *usec) {
1079 t += strspn(t, WHITESPACE);
1080 if (streq(t, "0")) {
1081 *usec = USEC_INFINITY;
1082 return 0;
1083 }
1084
1085 return parse_sec(t, usec);
1086}
1087
9a98c7a1
LP		 1088int parse_nsec(const char *t, nsec_t *nsec) {
1089 static const struct {
1090 const char *suffix;
1091 nsec_t nsec;
1092 } table[] = {
1093 { "seconds", NSEC_PER_SEC },
1094 { "second", NSEC_PER_SEC },
1095 { "sec", NSEC_PER_SEC },
1096 { "s", NSEC_PER_SEC },
1097 { "minutes", NSEC_PER_MINUTE },
1098 { "minute", NSEC_PER_MINUTE },
1099 { "min", NSEC_PER_MINUTE },
1100 { "months", NSEC_PER_MONTH },
1101 { "month", NSEC_PER_MONTH },
1102 { "msec", NSEC_PER_MSEC },
1103 { "ms", NSEC_PER_MSEC },
1104 { "m", NSEC_PER_MINUTE },
1105 { "hours", NSEC_PER_HOUR },
1106 { "hour", NSEC_PER_HOUR },
1107 { "hr", NSEC_PER_HOUR },
1108 { "h", NSEC_PER_HOUR },
1109 { "days", NSEC_PER_DAY },
1110 { "day", NSEC_PER_DAY },
1111 { "d", NSEC_PER_DAY },
1112 { "weeks", NSEC_PER_WEEK },
1113 { "week", NSEC_PER_WEEK },
1114 { "w", NSEC_PER_WEEK },
1115 { "years", NSEC_PER_YEAR },
1116 { "year", NSEC_PER_YEAR },
1117 { "y", NSEC_PER_YEAR },
1118 { "usec", NSEC_PER_USEC },
1119 { "us", NSEC_PER_USEC },
5efdbf11 1120 { "µs", NSEC_PER_USEC },
9a98c7a1
LP		 1121 { "nsec", 1ULL },
1122 { "ns", 1ULL },
1123 { "", 1ULL }, /* default is nsec */
1124 };
1125
e73c78c2 1126 const char *p, *s;
9a98c7a1 1127 nsec_t r = 0;
cb0dac05 1128 bool something = false;
9a98c7a1
LP		 1129
1130 assert(t);
1131 assert(nsec);
1132
1133 p = t;
e73c78c2
LP		 1134
1135 p += strspn(p, WHITESPACE);
1136 s = startswith(p, "infinity");
1137 if (s) {
1138 s += strspn(s, WHITESPACE);
8e8933ca 1139 if (*s != 0)
e73c78c2
LP		 1140 return -EINVAL;
1141
1142 *nsec = NSEC_INFINITY;
1143 return 0;
1144 }
1145
cb0dac05
LP		 1146 for (;;) {
1147 long long l, z = 0;
9a98c7a1 1148 char *e;
cb0dac05
LP		 1149 unsigned i, n = 0;
1150
1151 p += strspn(p, WHITESPACE);
1152
1153 if (*p == 0) {
1154 if (!something)
1155 return -EINVAL;
1156
1157 break;
1158 }
9a98c7a1
LP		 1159
1160 errno = 0;
1161 l = strtoll(p, &e, 10);
1162
8333c77e 1163 if (errno > 0)
9a98c7a1
LP		 1164 return -errno;
1165
1166 if (l < 0)
1167 return -ERANGE;
1168
cb0dac05
LP		 1169 if (*e == '.') {
1170 char *b = e + 1;
1171
1172 errno = 0;
1173 z = strtoll(b, &e, 10);
1174 if (errno > 0)
1175 return -errno;
1176
1177 if (z < 0)
1178 return -ERANGE;
1179
1180 if (e == b)
1181 return -EINVAL;
1182
1183 n = e - b;
1184
1185 } else if (e == p)
9a98c7a1
LP		 1186 return -EINVAL;
1187
1188 e += strspn(e, WHITESPACE);
1189
1190 for (i = 0; i < ELEMENTSOF(table); i++)
1191 if (startswith(e, table[i].suffix)) {
cb0dac05
LP		 1192 nsec_t k = (nsec_t) z * table[i].nsec;
1193
1194 for (; n > 0; n--)
1195 k /= 10;
1196
1197 r += (nsec_t) l * table[i].nsec + k;
9a98c7a1 1198 p = e + strlen(table[i].suffix);
cb0dac05
LP		 1199
1200 something = true;
9a98c7a1
LP		 1201 break;
1202 }
1203
1204 if (i >= ELEMENTSOF(table))
1205 return -EINVAL;
1206
cb0dac05 1207 }
9a98c7a1
LP		 1208
1209 *nsec = r;
1210
1211 return 0;
1212}
03cc26dd
LP		 1213
1214bool ntp_synced(void) {
1215 struct timex txc = {};
1216
1217 if (adjtimex(&txc) < 0)
1218 return false;
1219
1220 if (txc.status & STA_UNSYNC)
1221 return false;
1222
1223 return true;
1224}
75683450
LP		 1225
1226int get_timezones(char ***ret) {
1227 _cleanup_fclose_ FILE *f = NULL;
1228 _cleanup_strv_free_ char **zones = NULL;
1229 size_t n_zones = 0, n_allocated = 0;
1230
1231 assert(ret);
1232
1233 zones = strv_new("UTC", NULL);
1234 if (!zones)
1235 return -ENOMEM;
1236
1237 n_allocated = 2;
1238 n_zones = 1;
1239
1240 f = fopen("/usr/share/zoneinfo/zone.tab", "re");
1241 if (f) {
1242 char l[LINE_MAX];
1243
1244 FOREACH_LINE(l, f, return -errno) {
1245 char *p, *w;
1246 size_t k;
1247
1248 p = strstrip(l);
1249
1250 if (isempty(p) || *p == '#')
1251 continue;
1252
1253 /* Skip over country code */
1254 p += strcspn(p, WHITESPACE);
1255 p += strspn(p, WHITESPACE);
1256
1257 /* Skip over coordinates */
1258 p += strcspn(p, WHITESPACE);
1259 p += strspn(p, WHITESPACE);
1260
1261 /* Found timezone name */
1262 k = strcspn(p, WHITESPACE);
1263 if (k <= 0)
1264 continue;
1265
1266 w = strndup(p, k);
1267 if (!w)
1268 return -ENOMEM;
1269
1270 if (!GREEDY_REALLOC(zones, n_allocated, n_zones + 2)) {
1271 free(w);
1272 return -ENOMEM;
1273 }
1274
1275 zones[n_zones++] = w;
1276 zones[n_zones] = NULL;
1277 }
1278
1279 strv_sort(zones);
1280
1281 } else if (errno != ENOENT)
1282 return -errno;
1283
1284 *ret = zones;
1285 zones = NULL;
1286
1287 return 0;
1288}
1289
1290bool timezone_is_valid(const char *name) {
1291 bool slash = false;
1292 const char *p, *t;
1293 struct stat st;
1294
5c904ba5
LP		 1295 if (isempty(name))
1296 return false;
1297
1298 if (name[0] == '/')
75683450
LP		 1299 return false;
1300
1301 for (p = name; *p; p++) {
1302 if (!(*p >= '0' && *p <= '9') &&
1303 !(*p >= 'a' && *p <= 'z') &&
1304 !(*p >= 'A' && *p <= 'Z') &&
1305 !(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
1306 return false;
1307
1308 if (*p == '/') {
1309
1310 if (slash)
1311 return false;
1312
1313 slash = true;
1314 } else
1315 slash = false;
1316 }
1317
1318 if (slash)
1319 return false;
1320
63c372cb 1321 t = strjoina("/usr/share/zoneinfo/", name);
75683450
LP		 1322 if (stat(t, &st) < 0)
1323 return false;
1324
1325 if (!S_ISREG(st.st_mode))
1326 return false;
1327
1328 return true;
1329}
77ff2de9 1330
3411372e
LP		 1331bool clock_boottime_supported(void) {
1332 static int supported = -1;
1333
1334 /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */
1335
1336 if (supported < 0) {
1337 int fd;
1338
1339 fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
1340 if (fd < 0)
1341 supported = false;
1342 else {
1343 safe_close(fd);
1344 supported = true;
1345 }
77ff2de9
TG		 1346 }
1347
3411372e
LP		 1348 return supported;
1349}
1350
1351clockid_t clock_boottime_or_monotonic(void) {
1352 if (clock_boottime_supported())
1353 return CLOCK_BOOTTIME;
1354 else
1355 return CLOCK_MONOTONIC;
77ff2de9 1356}
5c904ba5 1357
fe624c4c
LP		 1358bool clock_supported(clockid_t clock) {
1359 struct timespec ts;
1360
1361 switch (clock) {
1362
1363 case CLOCK_MONOTONIC:
1364 case CLOCK_REALTIME:
1365 return true;
1366
1367 case CLOCK_BOOTTIME:
1368 return clock_boottime_supported();
1369
1370 case CLOCK_BOOTTIME_ALARM:
1371 if (!clock_boottime_supported())
1372 return false;
1373
ec251fe7 1374 /* fall through */
fe624c4c
LP		 1375
1376 default:
1377 /* For everything else, check properly */
1378 return clock_gettime(clock, &ts) >= 0;
1379 }
1380}
1381
64d6c229 1382int get_timezone(char **tz) {
5c904ba5
LP		 1383 _cleanup_free_ char *t = NULL;
1384 const char *e;
1385 char *z;
1386 int r;
1387
1388 r = readlink_malloc("/etc/localtime", &t);
1389 if (r < 0)
1390 return r; /* returns EINVAL if not a symlink */
1391
1392 e = path_startswith(t, "/usr/share/zoneinfo/");
1393 if (!e)
1394 e = path_startswith(t, "../usr/share/zoneinfo/");
1395 if (!e)
1396 return -EINVAL;
1397
1398 if (!timezone_is_valid(e))
1399 return -EINVAL;
1400
1401 z = strdup(e);
1402 if (!z)
1403 return -ENOMEM;
1404
64d6c229 1405 *tz = z;
5c904ba5
LP		 1406 return 0;
1407}
7c67c79c
HV		 1408
1409time_t mktime_or_timegm(struct tm *tm, bool utc) {
1410 return utc ? timegm(tm) : mktime(tm);
1411}
1412
1413struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
1414 return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
1415}
87b8ce69
SS		 1416
1417unsigned long usec_to_jiffies(usec_t u) {
1418 static thread_local unsigned long hz = 0;
1419 long r;
1420
1421 if (hz == 0) {
1422 r = sysconf(_SC_CLK_TCK);
1423
1424 assert(r > 0);
70887c5f 1425 hz = r;
87b8ce69
SS		 1426 }
1427
1428 return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
1429}
1007ec60
LP		 1430
1431usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to) {
1432 usec_t a, b;
1433
1434 if (x == USEC_INFINITY)
1435 return USEC_INFINITY;
1436 if (map_clock_id(from) == map_clock_id(to))
1437 return x;
1438
1439 a = now(from);
1440 b = now(to);
1441
1442 if (x > a)
1443 /* x lies in the future */
1444 return usec_add(b, usec_sub_unsigned(x, a));
1445 else
1446 /* x lies in the past */
1447 return usec_sub_unsigned(b, usec_sub_unsigned(a, x));
1448}
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