sysdeps/unix/sysv/linux/sleep.c

   1 /* Implementation of the POSIX sleep function using nanosleep.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <time.h>
  22 #include <unistd.h>
  23
  24 unsigned int
  25 __sleep (unsigned int seconds)
  26 {
  27   struct timespec ts = { tv_sec: (long int) seconds, tv_nsec: 0 };
  28   unsigned int result;
  29
  30   if (__nanosleep (&ts, &ts) == 0)
  31     result = 0;
  32   else
  33     /* Round remaining time.  */
  34     result = (unsigned int) ts.tv_sec + (ts.tv_nsec >= 500000000L);
  35
  36   return result;
  37 }
  38 weak_alias (__sleep, sleep)