sysdeps/unix/sysv/linux/timerfd_gettime.c

   1 /* timerfd_gettime -- get the timer setting referred to by file descriptor.
   2    Copyright (C) 2020-2024 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include <kernel-features.h>
  24
  25 int
  26 __timerfd_gettime64 (int fd, struct __itimerspec64 *value)
  27 {
  28 #ifndef __NR_timerfd_gettime64
  29 # define __NR_timerfd_gettime64 __NR_timerfd_gettime
  30 #endif
  31
  32 #ifdef __ASSUME_TIME64_SYSCALLS
  33   return INLINE_SYSCALL_CALL (timerfd_gettime64, fd, value);
  34 #else
  35   int ret = INLINE_SYSCALL_CALL (timerfd_gettime64, fd, value);
  36   if (ret == 0 || errno != ENOSYS)
  37     return ret;
  38   struct itimerspec its32;
  39   int retval = INLINE_SYSCALL_CALL (timerfd_gettime, fd, &its32);
  40   if (retval == 0)
  41     {
  42       value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
  43       value->it_value = valid_timespec_to_timespec64 (its32.it_value);
  44     }
  45
  46   return retval;
  47 #endif
  48 }
  49
  50 #if __TIMESIZE != 64
  51 libc_hidden_def (__timerfd_gettime64)
  52
  53 int
  54 __timerfd_gettime (int fd, struct itimerspec *value)
  55 {
  56   struct __itimerspec64 its64;
  57   int retval = __timerfd_gettime64 (fd, &its64);
  58   if (retval == 0)
  59     {
  60       value->it_interval = valid_timespec64_to_timespec (its64.it_interval);
  61       value->it_value = valid_timespec64_to_timespec (its64.it_value);
  62     }
  63
  64   return retval;
  65 }
  66 #endif
  67 strong_alias (__timerfd_gettime, timerfd_gettime)