glibc/sysdeps/unix/sysv/linux/timer_gettime.c

/* Copyright (C) 2003-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, see <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <sysdep.h>
#include <kernel-features.h>
#include "kernel-posix-timers.h"

int
__timer_gettime64 (timer_t timerid, struct __itimerspec64 *value)
{
  struct timer *kt = (struct timer *) timerid;

#ifdef __ASSUME_TIME64_SYSCALLS
# ifndef __NR_timer_gettime64
#  define __NR_timer_gettime64 __NR_timer_gettime
# endif
  return INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
#else
# ifdef __NR_timer_gettime64
  int ret = INLINE_SYSCALL_CALL (timer_gettime64, kt->ktimerid, value);
  if (ret == 0 || errno != ENOSYS)
    return ret;
# endif
  struct itimerspec its32;
  int retval = INLINE_SYSCALL_CALL (timer_gettime, kt->ktimerid, &its32);
  if (retval == 0)
    {
      value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
      value->it_value = valid_timespec_to_timespec64 (its32.it_value);
    }

  return retval;
#endif
}

#if __TIMESIZE != 64
int
__timer_gettime (timer_t timerid, struct itimerspec *value)
{
  struct __itimerspec64 its64;
  int retval = __timer_gettime64 (timerid, &its64);
  if (retval == 0)
    {
      value->it_interval = valid_timespec64_to_timespec (its64.it_interval);
      value->it_value = valid_timespec64_to_timespec (its64.it_value);
    }

  return retval;
}
#endif
weak_alias (__timer_gettime, timer_gettime)
libc_hidden_def (timer_gettime)