sysdeps/unix/sysv/linux/timer_gettime.c

   1 /* Copyright (C) 2003-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   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 #include "kernel-posix-timers.h"
  25
  26 int
  27 __timer_gettime64 (timer_t timerid, struct __itimerspec64 *value)
  28 {
  29   kernel_timer_t ktimerid = timerid_to_kernel_timer (timerid);
  30
  31 #ifndef __NR_timer_gettime64
  32 # define __NR_timer_gettime64 __NR_timer_gettime
  33 #endif
  34   int ret = INLINE_SYSCALL_CALL (timer_gettime64, ktimerid, value);
  35 #ifndef __ASSUME_TIME64_SYSCALLS
  36   if (ret == 0 || errno != ENOSYS)
  37     return ret;
  38
  39   struct itimerspec its32;
  40   ret = INLINE_SYSCALL_CALL (timer_gettime, ktimerid, &its32);
  41   if (ret == 0)
  42     {
  43       value->it_interval = valid_timespec_to_timespec64 (its32.it_interval);
  44       value->it_value = valid_timespec_to_timespec64 (its32.it_value);
  45     }
  46 #endif
  47   return ret;
  48 }
  49
  50 #if __TIMESIZE != 64
  51 librt_hidden_def (__timer_gettime64)
  52
  53 int
  54 __timer_gettime (timer_t timerid, struct itimerspec *value)
  55 {
  56   struct __itimerspec64 its64;
  57   int retval = __timer_gettime64 (timerid, &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 weak_alias (__timer_gettime, timer_gettime)