libpthread/nptl/sysdeps/unix/sysv/linux/timer_getoverr.c

   1 /* Copyright (C) 2003 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 <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <sysdep.h>
  22 #include <bits/kernel-features.h>
  23 #include "kernel-posix-timers.h"
  24
  25
  26 #ifdef __NR_timer_getoverrun
  27 # ifndef __ASSUME_POSIX_TIMERS
  28 static int compat_timer_getoverrun (timer_t timerid);
  29 #  define timer_getoverrun static compat_timer_getoverrun
  30 #  include <nptl/sysdeps/pthread/timer_getoverr.c>
  31 #  undef timer_getoverrun
  32 # endif
  33
  34 # ifdef timer_getoverrun_alias
  35 #  define timer_getoverrun timer_getoverrun_alias
  36 # endif
  37
  38
  39 int
  40 timer_getoverrun (
  41      timer_t timerid)
  42 {
  43 # undef timer_getoverrun
  44 # ifndef __ASSUME_POSIX_TIMERS
  45   if (__no_posix_timers >= 0)
  46 # endif
  47     {
  48       struct timer *kt = (struct timer *) timerid;
  49
  50       /* Get the information from the kernel.  */
  51       int res = INLINE_SYSCALL (timer_getoverrun, 1, kt->ktimerid);
  52
  53 # ifndef __ASSUME_POSIX_TIMERS
  54       if (res != -1 || errno != ENOSYS)
  55         {
  56           /* We know the syscall support is available.  */
  57           __no_posix_timers = 1;
  58 # endif
  59           return res;
  60 # ifndef __ASSUME_POSIX_TIMERS
  61         }
  62 # endif
  63
  64 # ifndef __ASSUME_POSIX_TIMERS
  65       __no_posix_timers = -1;
  66 # endif
  67     }
  68
  69 # ifndef __ASSUME_POSIX_TIMERS
  70   return compat_timer_getoverrun (timerid);
  71 # endif
  72 }
  73 #else
  74 # ifdef timer_getoverrun_alias
  75 #  define timer_getoverrun timer_getoverrun_alias
  76 # endif
  77 /* The new system calls are not available.  Use the userlevel
  78    implementation.  */
  79 # include <nptl/sysdeps/pthread/timer_getoverr.c>
  80 #endif