nptl/sysdeps/unix/sysv/linux/timer_settime.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 <stdlib.h>
  22 #include <time.h>
  23 #include <sysdep.h>
  24 #include <kernel-features.h>
  25 #include "kernel-posix-timers.h"
  26
  27
  28 #ifdef __NR_timer_settime
  29 # ifndef __ASSUME_POSIX_TIMERS
  30 static int compat_timer_settime (timer_t timerid, int flags,
  31                                  const struct itimerspec *value,
  32                                  struct itimerspec *ovalue);
  33 #  define timer_settime static compat_timer_settime
  34 #  include <nptl/sysdeps/pthread/timer_settime.c>
  35 #  undef timer_settime
  36 # endif
  37
  38 # ifdef timer_settime_alias
  39 #  define timer_settime timer_settime_alias
  40 # endif
  41
  42
  43 int
  44 timer_settime (timerid, flags, value, ovalue)
  45      timer_t timerid;
  46      int flags;
  47      const struct itimerspec *value;
  48      struct itimerspec *ovalue;
  49 {
  50 # undef timer_settime
  51 # ifndef __ASSUME_POSIX_TIMERS
  52   if (__no_posix_timers >= 0)
  53 # endif
  54     {
  55       struct timer *kt = (struct timer *) timerid;
  56
  57       /* Delete the kernel timer object.  */
  58       int res = INLINE_SYSCALL (timer_settime, 4, kt->ktimerid, flags,
  59                                 value, ovalue);
  60
  61 # ifndef __ASSUME_POSIX_TIMERS
  62       if (res != -1 || errno != ENOSYS)
  63         {
  64           /* We know the syscall support is available.  */
  65           __no_posix_timers = 1;
  66 # endif
  67           return res;
  68 # ifndef __ASSUME_POSIX_TIMERS
  69         }
  70 # endif
  71
  72 # ifndef __ASSUME_POSIX_TIMERS
  73       __no_posix_timers = -1;
  74 # endif
  75     }
  76
  77 # ifndef __ASSUME_POSIX_TIMERS
  78   return compat_timer_settime (timerid, flags, value, ovalue);
  79 # endif
  80 }
  81 #else
  82 # ifdef timer_settime_alias
  83 #  define timer_settime timer_settime_alias
  84 # endif
  85 /* The new system calls are not available.  Use the userlevel
  86    implementation.  */
  87 # include <nptl/sysdeps/pthread/timer_settime.c>
  88 #endif