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