support/xtime.h

   1 /* Support functionality for using time.
   2    Copyright (C) 2019-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef SUPPORT_TIME_H
  20 #define SUPPORT_TIME_H
  21
  22 #include <time.h>
  23
  24 __BEGIN_DECLS
  25
  26 /* Name of the env variable, which indicates if it is possible to
  27    adjust time on target machine.  */
  28 #define SETTIME_ENV_NAME "GLIBC_TEST_ALLOW_TIME_SETTING"
  29
  30 /* The following functions call the corresponding libc functions and
  31    terminate the process on error.  */
  32
  33 #ifndef __USE_TIME_BITS64
  34 void xclock_gettime (clockid_t clock, struct timespec *ts);
  35 void xclock_settime (clockid_t clock, const struct timespec *ts);
  36 #else
  37 void __REDIRECT (xclock_gettime, (clockid_t clock, struct timespec *ts),
  38                  xclock_gettime_time64);
  39 void __REDIRECT (xclock_settime, (clockid_t clock, const struct timespec *ts),
  40                  xclock_settime_time64);
  41 #endif
  42
  43 /* This helper can often simplify tests by avoiding an explicit
  44    variable declaration or allowing that declaration to be const. */
  45
  46 static inline struct timespec xclock_now (clockid_t clock)
  47 {
  48   struct timespec ts;
  49   xclock_gettime (clock, &ts);
  50   return ts;
  51 }
  52
  53 __END_DECLS
  54
  55 #endif /* SUPPORT_TIME_H */