src/basic/time-util.c

   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
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/time.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/timex.h>
  28 #include <sys/types.h>
  29 #include <unistd.h>
  30
  31 #include "alloc-util.h"
  32 #include "fd-util.h"
  33 #include "fileio.h"
  34 #include "fs-util.h"
  35 #include "log.h"
  36 #include "macro.h"
  37 #include "parse-util.h"
  38 #include "path-util.h"
  39 #include "string-util.h"
  40 #include "strv.h"
  41 #include "time-util.h"
  42
  43 #if 0 /// UNNEEDED by elogind
  44 static nsec_t timespec_load_nsec(const struct timespec *ts);
  45 #endif // 0
  46
  47 usec_t now(clockid_t clock_id) {
  48         struct timespec ts;
  49
  50         assert_se(clock_gettime(clock_id, &ts) == 0);
  51
  52         return timespec_load(&ts);
  53 }
  54
  55 #if 0 /// UNNEEDED by elogind
  56 nsec_t now_nsec(clockid_t clock_id) {
  57         struct timespec ts;
  58
  59         assert_se(clock_gettime(clock_id, &ts) == 0);
  60
  61         return timespec_load_nsec(&ts);
  62 }
  63 #endif // 0
  64
  65 dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
  66         assert(ts);
  67
  68         ts->realtime = now(CLOCK_REALTIME);
  69         ts->monotonic = now(CLOCK_MONOTONIC);
  70
  71         return ts;
  72 }
  73
  74 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
  75         int64_t delta;
  76         assert(ts);
  77
  78         if (u == USEC_INFINITY || u <= 0) {
  79                 ts->realtime = ts->monotonic = u;
  80                 return ts;
  81         }
  82
  83         ts->realtime = u;
  84
  85         delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
  86         ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta);
  87
  88         return ts;
  89 }
  90
  91 #if 0 /// UNNEEDED by elogind
  92 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
  93         int64_t delta;
  94         assert(ts);
  95
  96         if (u == USEC_INFINITY) {
  97                 ts->realtime = ts->monotonic = USEC_INFINITY;
  98                 return ts;
  99         }
 100
 101         ts->monotonic = u;
 102         delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
 103         ts->realtime = usec_sub(now(CLOCK_REALTIME), delta);
 104
 105         return ts;
 106 }
 107
 108 dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u) {
 109         int64_t delta;
 110
 111         if (u == USEC_INFINITY) {
 112                 ts->realtime = ts->monotonic = USEC_INFINITY;
 113                 return ts;
 114         }
 115
 116         dual_timestamp_get(ts);
 117         delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
 118         ts->realtime = usec_sub(ts->realtime, delta);
 119         ts->monotonic = usec_sub(ts->monotonic, delta);
 120
 121         return ts;
 122 }
 123 #endif // 0
 124
 125 usec_t timespec_load(const struct timespec *ts) {
 126         assert(ts);
 127
 128         if (ts->tv_sec == (time_t) -1 &&
 129             ts->tv_nsec == (long) -1)
 130                 return USEC_INFINITY;
 131
 132         if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
 133                 return USEC_INFINITY;
 134
 135         return
 136                 (usec_t) ts->tv_sec * USEC_PER_SEC +
 137                 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
 138 }
 139
 140 #if 0 /// UNNEEDED by elogind
 141 static nsec_t timespec_load_nsec(const struct timespec *ts) {
 142         assert(ts);
 143
 144         if (ts->tv_sec == (time_t) -1 &&
 145             ts->tv_nsec == (long) -1)
 146                 return NSEC_INFINITY;
 147
 148         return
 149                 (nsec_t) ts->tv_sec * NSEC_PER_SEC +
 150                 (nsec_t) ts->tv_nsec;
 151 }
 152 #endif // 0
 153
 154 struct timespec *timespec_store(struct timespec *ts, usec_t u)  {
 155         assert(ts);
 156
 157         if (u == USEC_INFINITY) {
 158                 ts->tv_sec = (time_t) -1;
 159                 ts->tv_nsec = (long) -1;
 160                 return ts;
 161         }
 162
 163         ts->tv_sec = (time_t) (u / USEC_PER_SEC);
 164         ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
 165
 166         return ts;
 167 }
 168
 169 usec_t timeval_load(const struct timeval *tv) {
 170         assert(tv);
 171
 172         if (tv->tv_sec == (time_t) -1 &&
 173             tv->tv_usec == (suseconds_t) -1)
 174                 return USEC_INFINITY;
 175
 176         if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC)
 177                 return USEC_INFINITY;
 178
 179         return
 180                 (usec_t) tv->tv_sec * USEC_PER_SEC +
 181                 (usec_t) tv->tv_usec;
 182 }
 183
 184 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
 185         assert(tv);
 186
 187         if (u == USEC_INFINITY) {
 188                 tv->tv_sec = (time_t) -1;
 189                 tv->tv_usec = (suseconds_t) -1;
 190         } else {
 191                 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
 192                 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
 193         }
 194
 195         return tv;
 196 }
 197
 198 static char *format_timestamp_internal(char *buf, size_t l, usec_t t,
 199                                        bool utc, bool us) {
 200         struct tm tm;
 201         time_t sec;
 202         int k;
 203
 204         assert(buf);
 205         assert(l > 0);
 206
 207         if (t <= 0 || t == USEC_INFINITY)
 208                 return NULL;
 209
 210         sec = (time_t) (t / USEC_PER_SEC);
 211         localtime_or_gmtime_r(&sec, &tm, utc);
 212
 213         if (us)
 214                 k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm);
 215         else
 216                 k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm);
 217
 218         if (k <= 0)
 219                 return NULL;
 220         if (us) {
 221                 snprintf(buf + strlen(buf), l - strlen(buf), ".%06llu", (unsigned long long) (t % USEC_PER_SEC));
 222                 if (strftime(buf + strlen(buf), l - strlen(buf), " %Z", &tm) <= 0)
 223                         return NULL;
 224         }
 225
 226         return buf;
 227 }
 228
 229 char *format_timestamp(char *buf, size_t l, usec_t t) {
 230         return format_timestamp_internal(buf, l, t, false, false);
 231 }
 232
 233 #if 0 /// UNNEEDED by elogind
 234 char *format_timestamp_utc(char *buf, size_t l, usec_t t) {
 235         return format_timestamp_internal(buf, l, t, true, false);
 236 }
 237 #endif // 0
 238
 239 char *format_timestamp_us(char *buf, size_t l, usec_t t) {
 240         return format_timestamp_internal(buf, l, t, false, true);
 241 }
 242
 243 #if 0 /// UNNEEDED by elogind
 244 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {
 245         return format_timestamp_internal(buf, l, t, true, true);
 246 }
 247 #endif // 0
 248
 249 char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
 250         const char *s;
 251         usec_t n, d;
 252
 253         if (t <= 0 || t == USEC_INFINITY)
 254                 return NULL;
 255
 256         n = now(CLOCK_REALTIME);
 257         if (n > t) {
 258                 d = n - t;
 259                 s = "ago";
 260         } else {
 261                 d = t - n;
 262                 s = "left";
 263         }
 264
 265         if (d >= USEC_PER_YEAR)
 266                 snprintf(buf, l, USEC_FMT " years " USEC_FMT " months %s",
 267                          d / USEC_PER_YEAR,
 268                          (d % USEC_PER_YEAR) / USEC_PER_MONTH, s);
 269         else if (d >= USEC_PER_MONTH)
 270                 snprintf(buf, l, USEC_FMT " months " USEC_FMT " days %s",
 271                          d / USEC_PER_MONTH,
 272                          (d % USEC_PER_MONTH) / USEC_PER_DAY, s);
 273         else if (d >= USEC_PER_WEEK)
 274                 snprintf(buf, l, USEC_FMT " weeks " USEC_FMT " days %s",
 275                          d / USEC_PER_WEEK,
 276                          (d % USEC_PER_WEEK) / USEC_PER_DAY, s);
 277         else if (d >= 2*USEC_PER_DAY)
 278                 snprintf(buf, l, USEC_FMT " days %s", d / USEC_PER_DAY, s);
 279         else if (d >= 25*USEC_PER_HOUR)
 280                 snprintf(buf, l, "1 day " USEC_FMT "h %s",
 281                          (d - USEC_PER_DAY) / USEC_PER_HOUR, s);
 282         else if (d >= 6*USEC_PER_HOUR)
 283                 snprintf(buf, l, USEC_FMT "h %s",
 284                          d / USEC_PER_HOUR, s);
 285         else if (d >= USEC_PER_HOUR)
 286                 snprintf(buf, l, USEC_FMT "h " USEC_FMT "min %s",
 287                          d / USEC_PER_HOUR,
 288                          (d % USEC_PER_HOUR) / USEC_PER_MINUTE, s);
 289         else if (d >= 5*USEC_PER_MINUTE)
 290                 snprintf(buf, l, USEC_FMT "min %s",
 291                          d / USEC_PER_MINUTE, s);
 292         else if (d >= USEC_PER_MINUTE)
 293                 snprintf(buf, l, USEC_FMT "min " USEC_FMT "s %s",
 294                          d / USEC_PER_MINUTE,
 295                          (d % USEC_PER_MINUTE) / USEC_PER_SEC, s);
 296         else if (d >= USEC_PER_SEC)
 297                 snprintf(buf, l, USEC_FMT "s %s",
 298                          d / USEC_PER_SEC, s);
 299         else if (d >= USEC_PER_MSEC)
 300                 snprintf(buf, l, USEC_FMT "ms %s",
 301                          d / USEC_PER_MSEC, s);
 302         else if (d > 0)
 303                 snprintf(buf, l, USEC_FMT"us %s",
 304                          d, s);
 305         else
 306                 snprintf(buf, l, "now");
 307
 308         buf[l-1] = 0;
 309         return buf;
 310 }
 311
 312 char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
 313         static const struct {
 314                 const char *suffix;
 315                 usec_t usec;
 316         } table[] = {
 317                 { "y", USEC_PER_YEAR },
 318                 { "month", USEC_PER_MONTH },
 319                 { "w", USEC_PER_WEEK },
 320                 { "d", USEC_PER_DAY },
 321                 { "h", USEC_PER_HOUR },
 322                 { "min", USEC_PER_MINUTE },
 323                 { "s", USEC_PER_SEC },
 324                 { "ms", USEC_PER_MSEC },
 325                 { "us", 1 },
 326         };
 327
 328         unsigned i;
 329         char *p = buf;
 330         bool something = false;
 331
 332         assert(buf);
 333         assert(l > 0);
 334
 335         if (t == USEC_INFINITY) {
 336                 strncpy(p, "infinity", l-1);
 337                 p[l-1] = 0;
 338                 return p;
 339         }
 340
 341         if (t <= 0) {
 342                 strncpy(p, "0", l-1);
 343                 p[l-1] = 0;
 344                 return p;
 345         }
 346
 347         /* The result of this function can be parsed with parse_sec */
 348
 349         for (i = 0; i < ELEMENTSOF(table); i++) {
 350                 int k = 0;
 351                 size_t n;
 352                 bool done = false;
 353                 usec_t a, b;
 354
 355                 if (t <= 0)
 356                         break;
 357
 358                 if (t < accuracy && something)
 359                         break;
 360
 361                 if (t < table[i].usec)
 362                         continue;
 363
 364                 if (l <= 1)
 365                         break;
 366
 367                 a = t / table[i].usec;
 368                 b = t % table[i].usec;
 369
 370                 /* Let's see if we should shows this in dot notation */
 371                 if (t < USEC_PER_MINUTE && b > 0) {
 372                         usec_t cc;
 373                         int j;
 374
 375                         j = 0;
 376                         for (cc = table[i].usec; cc > 1; cc /= 10)
 377                                 j++;
 378
 379                         for (cc = accuracy; cc > 1; cc /= 10) {
 380                                 b /= 10;
 381                                 j--;
 382                         }
 383
 384                         if (j > 0) {
 385                                 k = snprintf(p, l,
 386                                              "%s"USEC_FMT".%0*llu%s",
 387                                              p > buf ? " " : "",
 388                                              a,
 389                                              j,
 390                                              (unsigned long long) b,
 391                                              table[i].suffix);
 392
 393                                 t = 0;
 394                                 done = true;
 395                         }
 396                 }
 397
 398                 /* No? Then let's show it normally */
 399                 if (!done) {
 400                         k = snprintf(p, l,
 401                                      "%s"USEC_FMT"%s",
 402                                      p > buf ? " " : "",
 403                                      a,
 404                                      table[i].suffix);
 405
 406                         t = b;
 407                 }
 408
 409                 n = MIN((size_t) k, l);
 410
 411                 l -= n;
 412                 p += n;
 413
 414                 something = true;
 415         }
 416
 417         *p = 0;
 418
 419         return buf;
 420 }
 421
 422 #if 0 /// UNNEEDED by elogind
 423 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
 424
 425         assert(f);
 426         assert(name);
 427         assert(t);
 428
 429         if (!dual_timestamp_is_set(t))
 430                 return;
 431
 432         fprintf(f, "%s="USEC_FMT" "USEC_FMT"\n",
 433                 name,
 434                 t->realtime,
 435                 t->monotonic);
 436 }
 437
 438 int dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
 439         unsigned long long a, b;
 440
 441         assert(value);
 442         assert(t);
 443
 444         if (sscanf(value, "%llu %llu", &a, &b) != 2) {
 445                 log_debug("Failed to parse finish timestamp value %s.", value);
 446                 return -EINVAL;
 447         }
 448
 449         t->realtime = a;
 450         t->monotonic = b;
 451
 452         return 0;
 453 }
 454
 455 int parse_timestamp(const char *t, usec_t *usec) {
 456         static const struct {
 457                 const char *name;
 458                 const int nr;
 459         } day_nr[] = {
 460                 { "Sunday",    0 },
 461                 { "Sun",       0 },
 462                 { "Monday",    1 },
 463                 { "Mon",       1 },
 464                 { "Tuesday",   2 },
 465                 { "Tue",       2 },
 466                 { "Wednesday", 3 },
 467                 { "Wed",       3 },
 468                 { "Thursday",  4 },
 469                 { "Thu",       4 },
 470                 { "Friday",    5 },
 471                 { "Fri",       5 },
 472                 { "Saturday",  6 },
 473                 { "Sat",       6 },
 474         };
 475
 476         const char *k;
 477         const char *utc;
 478         struct tm tm, copy;
 479         time_t x;
 480         usec_t x_usec, plus = 0, minus = 0, ret;
 481         int r, weekday = -1;
 482         unsigned i;
 483
 484         /*
 485          * Allowed syntaxes:
 486          *
 487          *   2012-09-22 16:34:22
 488          *   2012-09-22 16:34     (seconds will be set to 0)
 489          *   2012-09-22           (time will be set to 00:00:00)
 490          *   16:34:22             (date will be set to today)
 491          *   16:34                (date will be set to today, seconds to 0)
 492          *   now
 493          *   yesterday            (time is set to 00:00:00)
 494          *   today                (time is set to 00:00:00)
 495          *   tomorrow             (time is set to 00:00:00)
 496          *   +5min
 497          *   -5days
 498          *   @2147483647          (seconds since epoch)
 499          *
 500          */
 501
 502         assert(t);
 503         assert(usec);
 504
 505         if (t[0] == '@')
 506                 return parse_sec(t + 1, usec);
 507
 508         ret = now(CLOCK_REALTIME);
 509
 510         if (streq(t, "now"))
 511                 goto finish;
 512
 513         else if (t[0] == '+') {
 514                 r = parse_sec(t+1, &plus);
 515                 if (r < 0)
 516                         return r;
 517
 518                 goto finish;
 519
 520         } else if (t[0] == '-') {
 521                 r = parse_sec(t+1, &minus);
 522                 if (r < 0)
 523                         return r;
 524
 525                 goto finish;
 526
 527         } else if ((k = endswith(t, " ago"))) {
 528                 t = strndupa(t, k - t);
 529
 530                 r = parse_sec(t, &minus);
 531                 if (r < 0)
 532                         return r;
 533
 534                 goto finish;
 535
 536         } else if ((k = endswith(t, " left"))) {
 537                 t = strndupa(t, k - t);
 538
 539                 r = parse_sec(t, &plus);
 540                 if (r < 0)
 541                         return r;
 542
 543                 goto finish;
 544         }
 545
 546         utc = endswith_no_case(t, " UTC");
 547         if (utc)
 548                 t = strndupa(t, utc - t);
 549
 550         x = ret / USEC_PER_SEC;
 551         x_usec = 0;
 552
 553         assert_se(localtime_or_gmtime_r(&x, &tm, utc));
 554         tm.tm_isdst = -1;
 555
 556         if (streq(t, "today")) {
 557                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
 558                 goto from_tm;
 559
 560         } else if (streq(t, "yesterday")) {
 561                 tm.tm_mday --;
 562                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
 563                 goto from_tm;
 564
 565         } else if (streq(t, "tomorrow")) {
 566                 tm.tm_mday ++;
 567                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
 568                 goto from_tm;
 569         }
 570
 571
 572         for (i = 0; i < ELEMENTSOF(day_nr); i++) {
 573                 size_t skip;
 574
 575                 if (!startswith_no_case(t, day_nr[i].name))
 576                         continue;
 577
 578                 skip = strlen(day_nr[i].name);
 579                 if (t[skip] != ' ')
 580                         continue;
 581
 582                 weekday = day_nr[i].nr;
 583                 t += skip + 1;
 584                 break;
 585         }
 586
 587         copy = tm;
 588         k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
 589         if (k) {
 590                 if (*k == '.')
 591                         goto parse_usec;
 592                 else if (*k == 0)
 593                         goto from_tm;
 594         }
 595
 596         tm = copy;
 597         k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
 598         if (k) {
 599                 if (*k == '.')
 600                         goto parse_usec;
 601                 else if (*k == 0)
 602                         goto from_tm;
 603         }
 604
 605         tm = copy;
 606         k = strptime(t, "%y-%m-%d %H:%M", &tm);
 607         if (k && *k == 0) {
 608                 tm.tm_sec = 0;
 609                 goto from_tm;
 610         }
 611
 612         tm = copy;
 613         k = strptime(t, "%Y-%m-%d %H:%M", &tm);
 614         if (k && *k == 0) {
 615                 tm.tm_sec = 0;
 616                 goto from_tm;
 617         }
 618
 619         tm = copy;
 620         k = strptime(t, "%y-%m-%d", &tm);
 621         if (k && *k == 0) {
 622                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
 623                 goto from_tm;
 624         }
 625
 626         tm = copy;
 627         k = strptime(t, "%Y-%m-%d", &tm);
 628         if (k && *k == 0) {
 629                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
 630                 goto from_tm;
 631         }
 632
 633         tm = copy;
 634         k = strptime(t, "%H:%M:%S", &tm);
 635         if (k) {
 636                 if (*k == '.')
 637                         goto parse_usec;
 638                 else if (*k == 0)
 639                         goto from_tm;
 640         }
 641
 642         tm = copy;
 643         k = strptime(t, "%H:%M", &tm);
 644         if (k && *k == 0) {
 645                 tm.tm_sec = 0;
 646                 goto from_tm;
 647         }
 648
 649         return -EINVAL;
 650
 651 parse_usec:
 652         {
 653                 unsigned add;
 654
 655                 k++;
 656                 r = parse_fractional_part_u(&k, 6, &add);
 657                 if (r < 0)
 658                         return -EINVAL;
 659
 660                 if (*k)
 661                         return -EINVAL;
 662
 663                 x_usec = add;
 664
 665         }
 666
 667 from_tm:
 668         x = mktime_or_timegm(&tm, utc);
 669         if (x == (time_t) -1)
 670                 return -EINVAL;
 671
 672         if (weekday >= 0 && tm.tm_wday != weekday)
 673                 return -EINVAL;
 674
 675         ret = (usec_t) x * USEC_PER_SEC + x_usec;
 676
 677 finish:
 678         ret += plus;
 679         if (ret > minus)
 680                 ret -= minus;
 681         else
 682                 ret = 0;
 683
 684         *usec = ret;
 685
 686         return 0;
 687 }
 688 #endif // 0
 689
 690 int parse_time(const char *t, usec_t *usec, usec_t default_unit) {
 691
 692         static const struct {
 693                 const char *suffix;
 694                 usec_t usec;
 695         } table[] = {
 696                 { "seconds", USEC_PER_SEC },
 697                 { "second", USEC_PER_SEC },
 698                 { "sec", USEC_PER_SEC },
 699                 { "s", USEC_PER_SEC },
 700                 { "minutes", USEC_PER_MINUTE },
 701                 { "minute", USEC_PER_MINUTE },
 702                 { "min", USEC_PER_MINUTE },
 703                 { "months", USEC_PER_MONTH },
 704                 { "month", USEC_PER_MONTH },
 705                 { "M",       USEC_PER_MONTH  },
 706                 { "msec", USEC_PER_MSEC },
 707                 { "ms", USEC_PER_MSEC },
 708                 { "m", USEC_PER_MINUTE },
 709                 { "hours", USEC_PER_HOUR },
 710                 { "hour", USEC_PER_HOUR },
 711                 { "hr", USEC_PER_HOUR },
 712                 { "h", USEC_PER_HOUR },
 713                 { "days", USEC_PER_DAY },
 714                 { "day", USEC_PER_DAY },
 715                 { "d", USEC_PER_DAY },
 716                 { "weeks", USEC_PER_WEEK },
 717                 { "week", USEC_PER_WEEK },
 718                 { "w", USEC_PER_WEEK },
 719                 { "years", USEC_PER_YEAR },
 720                 { "year", USEC_PER_YEAR },
 721                 { "y", USEC_PER_YEAR },
 722                 { "usec", 1ULL },
 723                 { "us", 1ULL },
 724         };
 725
 726         const char *p, *s;
 727         usec_t r = 0;
 728         bool something = false;
 729
 730         assert(t);
 731         assert(usec);
 732         assert(default_unit > 0);
 733
 734         p = t;
 735
 736         p += strspn(p, WHITESPACE);
 737         s = startswith(p, "infinity");
 738         if (s) {
 739                 s += strspn(s, WHITESPACE);
 740                 if (*s != 0)
 741                         return -EINVAL;
 742
 743                 *usec = USEC_INFINITY;
 744                 return 0;
 745         }
 746
 747         for (;;) {
 748                 long long l, z = 0;
 749                 char *e;
 750                 unsigned i, n = 0;
 751                 usec_t multiplier, k;
 752
 753                 p += strspn(p, WHITESPACE);
 754
 755                 if (*p == 0) {
 756                         if (!something)
 757                                 return -EINVAL;
 758
 759                         break;
 760                 }
 761
 762                 errno = 0;
 763                 l = strtoll(p, &e, 10);
 764
 765                 if (errno > 0)
 766                         return -errno;
 767
 768                 if (l < 0)
 769                         return -ERANGE;
 770
 771                 if (*e == '.') {
 772                         char *b = e + 1;
 773
 774                         errno = 0;
 775                         z = strtoll(b, &e, 10);
 776                         if (errno > 0)
 777                                 return -errno;
 778
 779                         if (z < 0)
 780                                 return -ERANGE;
 781
 782                         if (e == b)
 783                                 return -EINVAL;
 784
 785                         n = e - b;
 786
 787                 } else if (e == p)
 788                         return -EINVAL;
 789
 790                 e += strspn(e, WHITESPACE);
 791
 792                 for (i = 0; i < ELEMENTSOF(table); i++)
 793                         if (startswith(e, table[i].suffix)) {
 794                                 multiplier = table[i].usec;
 795                                 p = e + strlen(table[i].suffix);
 796                                 break;
 797                         }
 798
 799                 if (i >= ELEMENTSOF(table)) {
 800                         multiplier = default_unit;
 801                         p = e;
 802                 }
 803
 804                 something = true;
 805
 806                 k = (usec_t) z * multiplier;
 807
 808                 for (; n > 0; n--)
 809                         k /= 10;
 810
 811                 r += (usec_t) l * multiplier + k;
 812         }
 813
 814         *usec = r;
 815
 816         return 0;
 817 }
 818
 819 int parse_sec(const char *t, usec_t *usec) {
 820         return parse_time(t, usec, USEC_PER_SEC);
 821 }
 822
 823 #if 0 /// UNNEEDED by elogind
 824 int parse_nsec(const char *t, nsec_t *nsec) {
 825         static const struct {
 826                 const char *suffix;
 827                 nsec_t nsec;
 828         } table[] = {
 829                 { "seconds", NSEC_PER_SEC },
 830                 { "second", NSEC_PER_SEC },
 831                 { "sec", NSEC_PER_SEC },
 832                 { "s", NSEC_PER_SEC },
 833                 { "minutes", NSEC_PER_MINUTE },
 834                 { "minute", NSEC_PER_MINUTE },
 835                 { "min", NSEC_PER_MINUTE },
 836                 { "months", NSEC_PER_MONTH },
 837                 { "month", NSEC_PER_MONTH },
 838                 { "msec", NSEC_PER_MSEC },
 839                 { "ms", NSEC_PER_MSEC },
 840                 { "m", NSEC_PER_MINUTE },
 841                 { "hours", NSEC_PER_HOUR },
 842                 { "hour", NSEC_PER_HOUR },
 843                 { "hr", NSEC_PER_HOUR },
 844                 { "h", NSEC_PER_HOUR },
 845                 { "days", NSEC_PER_DAY },
 846                 { "day", NSEC_PER_DAY },
 847                 { "d", NSEC_PER_DAY },
 848                 { "weeks", NSEC_PER_WEEK },
 849                 { "week", NSEC_PER_WEEK },
 850                 { "w", NSEC_PER_WEEK },
 851                 { "years", NSEC_PER_YEAR },
 852                 { "year", NSEC_PER_YEAR },
 853                 { "y", NSEC_PER_YEAR },
 854                 { "usec", NSEC_PER_USEC },
 855                 { "us", NSEC_PER_USEC },
 856                 { "nsec", 1ULL },
 857                 { "ns", 1ULL },
 858                 { "", 1ULL }, /* default is nsec */
 859         };
 860
 861         const char *p, *s;
 862         nsec_t r = 0;
 863         bool something = false;
 864
 865         assert(t);
 866         assert(nsec);
 867
 868         p = t;
 869
 870         p += strspn(p, WHITESPACE);
 871         s = startswith(p, "infinity");
 872         if (s) {
 873                 s += strspn(s, WHITESPACE);
 874                 if (*s != 0)
 875                         return -EINVAL;
 876
 877                 *nsec = NSEC_INFINITY;
 878                 return 0;
 879         }
 880
 881         for (;;) {
 882                 long long l, z = 0;
 883                 char *e;
 884                 unsigned i, n = 0;
 885
 886                 p += strspn(p, WHITESPACE);
 887
 888                 if (*p == 0) {
 889                         if (!something)
 890                                 return -EINVAL;
 891
 892                         break;
 893                 }
 894
 895                 errno = 0;
 896                 l = strtoll(p, &e, 10);
 897
 898                 if (errno > 0)
 899                         return -errno;
 900
 901                 if (l < 0)
 902                         return -ERANGE;
 903
 904                 if (*e == '.') {
 905                         char *b = e + 1;
 906
 907                         errno = 0;
 908                         z = strtoll(b, &e, 10);
 909                         if (errno > 0)
 910                                 return -errno;
 911
 912                         if (z < 0)
 913                                 return -ERANGE;
 914
 915                         if (e == b)
 916                                 return -EINVAL;
 917
 918                         n = e - b;
 919
 920                 } else if (e == p)
 921                         return -EINVAL;
 922
 923                 e += strspn(e, WHITESPACE);
 924
 925                 for (i = 0; i < ELEMENTSOF(table); i++)
 926                         if (startswith(e, table[i].suffix)) {
 927                                 nsec_t k = (nsec_t) z * table[i].nsec;
 928
 929                                 for (; n > 0; n--)
 930                                         k /= 10;
 931
 932                                 r += (nsec_t) l * table[i].nsec + k;
 933                                 p = e + strlen(table[i].suffix);
 934
 935                                 something = true;
 936                                 break;
 937                         }
 938
 939                 if (i >= ELEMENTSOF(table))
 940                         return -EINVAL;
 941
 942         }
 943
 944         *nsec = r;
 945
 946         return 0;
 947 }
 948
 949 bool ntp_synced(void) {
 950         struct timex txc = {};
 951
 952         if (adjtimex(&txc) < 0)
 953                 return false;
 954
 955         if (txc.status & STA_UNSYNC)
 956                 return false;
 957
 958         return true;
 959 }
 960
 961 int get_timezones(char ***ret) {
 962         _cleanup_fclose_ FILE *f = NULL;
 963         _cleanup_strv_free_ char **zones = NULL;
 964         size_t n_zones = 0, n_allocated = 0;
 965
 966         assert(ret);
 967
 968         zones = strv_new("UTC", NULL);
 969         if (!zones)
 970                 return -ENOMEM;
 971
 972         n_allocated = 2;
 973         n_zones = 1;
 974
 975         f = fopen("/usr/share/zoneinfo/zone.tab", "re");
 976         if (f) {
 977                 char l[LINE_MAX];
 978
 979                 FOREACH_LINE(l, f, return -errno) {
 980                         char *p, *w;
 981                         size_t k;
 982
 983                         p = strstrip(l);
 984
 985                         if (isempty(p) || *p == '#')
 986                                 continue;
 987
 988                         /* Skip over country code */
 989                         p += strcspn(p, WHITESPACE);
 990                         p += strspn(p, WHITESPACE);
 991
 992                         /* Skip over coordinates */
 993                         p += strcspn(p, WHITESPACE);
 994                         p += strspn(p, WHITESPACE);
 995
 996                         /* Found timezone name */
 997                         k = strcspn(p, WHITESPACE);
 998                         if (k <= 0)
 999                                 continue;
1000
1001                         w = strndup(p, k);
1002                         if (!w)
1003                                 return -ENOMEM;
1004
1005                         if (!GREEDY_REALLOC(zones, n_allocated, n_zones + 2)) {
1006                                 free(w);
1007                                 return -ENOMEM;
1008                         }
1009
1010                         zones[n_zones++] = w;
1011                         zones[n_zones] = NULL;
1012                 }
1013
1014                 strv_sort(zones);
1015
1016         } else if (errno != ENOENT)
1017                 return -errno;
1018
1019         *ret = zones;
1020         zones = NULL;
1021
1022         return 0;
1023 }
1024
1025 bool timezone_is_valid(const char *name) {
1026         bool slash = false;
1027         const char *p, *t;
1028         struct stat st;
1029
1030         if (isempty(name))
1031                 return false;
1032
1033         if (name[0] == '/')
1034                 return false;
1035
1036         for (p = name; *p; p++) {
1037                 if (!(*p >= '0' && *p <= '9') &&
1038                     !(*p >= 'a' && *p <= 'z') &&
1039                     !(*p >= 'A' && *p <= 'Z') &&
1040                     !(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
1041                         return false;
1042
1043                 if (*p == '/') {
1044
1045                         if (slash)
1046                                 return false;
1047
1048                         slash = true;
1049                 } else
1050                         slash = false;
1051         }
1052
1053         if (slash)
1054                 return false;
1055
1056         t = strjoina("/usr/share/zoneinfo/", name);
1057         if (stat(t, &st) < 0)
1058                 return false;
1059
1060         if (!S_ISREG(st.st_mode))
1061                 return false;
1062
1063         return true;
1064 }
1065
1066 clockid_t clock_boottime_or_monotonic(void) {
1067         static clockid_t clock = -1;
1068         int fd;
1069
1070         if (clock != -1)
1071                 return clock;
1072
1073         fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
1074         if (fd < 0)
1075                 clock = CLOCK_MONOTONIC;
1076         else {
1077                 safe_close(fd);
1078                 clock = CLOCK_BOOTTIME;
1079         }
1080
1081         return clock;
1082 }
1083
1084 int get_timezone(char **tz) {
1085         _cleanup_free_ char *t = NULL;
1086         const char *e;
1087         char *z;
1088         int r;
1089
1090         r = readlink_malloc("/etc/localtime", &t);
1091         if (r < 0)
1092                 return r; /* returns EINVAL if not a symlink */
1093
1094         e = path_startswith(t, "/usr/share/zoneinfo/");
1095         if (!e)
1096                 e = path_startswith(t, "../usr/share/zoneinfo/");
1097         if (!e)
1098                 return -EINVAL;
1099
1100         if (!timezone_is_valid(e))
1101                 return -EINVAL;
1102
1103         z = strdup(e);
1104         if (!z)
1105                 return -ENOMEM;
1106
1107         *tz = z;
1108         return 0;
1109 }
1110
1111 time_t mktime_or_timegm(struct tm *tm, bool utc) {
1112         return utc ? timegm(tm) : mktime(tm);
1113 }
1114 #endif // 0
1115
1116 struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
1117         return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
1118 }
1119
1120 #if 0 /// UNNEEDED by elogind
1121 unsigned long usec_to_jiffies(usec_t u) {
1122         static thread_local unsigned long hz = 0;
1123         long r;
1124
1125         if (hz == 0) {
1126                 r = sysconf(_SC_CLK_TCK);
1127
1128                 assert(r > 0);
1129                 hz = (unsigned long) r;
1130         }
1131
1132         return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
1133 }
1134 #endif // 0