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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include <kernel-features.h>
  24 #include "kernel-posix-timers.h"
  25
  26
  27 #ifdef __NR_timer_getoverrun
  28 # ifndef __ASSUME_POSIX_TIMERS
  29 static int compat_timer_getoverrun (timer_t timerid);
  30 #  define timer_getoverrun static compat_timer_getoverrun
  31 #  include <nptl/sysdeps/pthread/timer_getoverr.c>
  32 #  undef timer_getoverrun
  33 # endif
  34
  35 # ifdef timer_getoverrun_alias
  36 #  define timer_getoverrun timer_getoverrun_alias
  37 # endif
  38
  39
  40 int
  41 timer_getoverrun (timerid)
  42      timer_t timerid;
  43 {
  44 # undef timer_getoverrun
  45 # ifndef __ASSUME_POSIX_TIMERS
  46   if (__no_posix_timers >= 0)
  47 # endif
  48     {
  49       struct timer *kt = (struct timer *) timerid;
  50
  51       /* Get the information from the kernel.  */
  52       int res = INLINE_SYSCALL (timer_getoverrun, 1, kt->ktimerid);
  53
  54 # ifndef __ASSUME_POSIX_TIMERS
  55       if (res != -1 || errno != ENOSYS)
  56         {
  57           /* We know the syscall support is available.  */
  58           __no_posix_timers = 1;
  59 # endif
  60           return res;
  61 # ifndef __ASSUME_POSIX_TIMERS
  62         }
  63 # endif
  64
  65 # ifndef __ASSUME_POSIX_TIMERS
  66       __no_posix_timers = -1;
  67 # endif
  68     }
  69
  70 # ifndef __ASSUME_POSIX_TIMERS
  71   return compat_timer_getoverrun (timerid);
  72 # endif
  73 }
  74 #else
  75 # ifdef timer_getoverrun_alias
  76 #  define timer_getoverrun timer_getoverrun_alias
  77 # endif
  78 /* The new system calls are not available.  Use the userlevel
  79    implementation.  */
  80 # include <nptl/sysdeps/pthread/timer_getoverr.c>
  81 #endif