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

/* setitimer -- Set the state of an interval timer.  Linux/32 version.
   Copyright (C) 2020-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sysdep.h>
#include <tv32-compat.h>

int
__setitimer64 (__itimer_which_t which,
               const struct __itimerval64 *restrict new_value,
               struct __itimerval64 *restrict old_value)
{
#if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
  return INLINE_SYSCALL_CALL (setitimer, which, new_value, old_value);
#else
  struct __itimerval32 new_value_32;

  if (! in_time_t_range (new_value->it_interval.tv_sec)
      || ! in_time_t_range (new_value->it_value.tv_sec))
    {
      __set_errno (EOVERFLOW);
      return -1;
    }
  new_value_32.it_interval
    = valid_timeval64_to_timeval32 (new_value->it_interval);
  new_value_32.it_value
    = valid_timeval64_to_timeval32 (new_value->it_value);

  if (old_value == NULL)
    return INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, NULL);

  struct __itimerval32 old_value_32;
  if (INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, &old_value_32)
      == -1)
    return -1;

  old_value->it_interval
     = valid_timeval32_to_timeval64 (old_value_32.it_interval);
  old_value->it_value
     = valid_timeval32_to_timeval64 (old_value_32.it_value);
  return 0;
#endif
}

#if __TIMESIZE != 64
libc_hidden_def (__setitimer64)
int
__setitimer (__itimer_which_t which,
             const struct itimerval *restrict new_value,
             struct itimerval *restrict old_value)
{
  int ret;
  struct __itimerval64 new64, old64;

  new64.it_interval
    = valid_timeval_to_timeval64 (new_value->it_interval);
  new64.it_value
    = valid_timeval_to_timeval64 (new_value->it_value);

  ret = __setitimer64 (which, &new64, old_value ? &old64 : NULL);

  if (ret == 0 && old_value != NULL)
    {
      old_value->it_interval
        = valid_timeval64_to_timeval (old64.it_interval);
      old_value->it_value
        = valid_timeval64_to_timeval (old64.it_value);
    }

  return ret;
}
#endif
weak_alias (__setitimer, setitimer)