1  /* Support functionality for using time.
       2     Copyright (C) 2019-2023 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 */