sysdeps/unix/sysv/linux/sleep.c

   1 /* sleep - Implementation of the POSIX sleep function using nanosleep.
   2 Copyright (C) 1996 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
  18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include <time.h>
  22
  23 unsigned int
  24 sleep (unsigned int seconds)
  25 {
  26   struct timespec ts = { tv_sec: (long int) seconds, tv_nsec: 0 };
  27   unsigned int result;
  28
  29   if (__nanosleep (&ts, &ts) == 0)
  30     result = 0;
  31   else
  32     /* Round remaining time.  */
  33     result = (unsigned int) ts.tv_sec + (ts.tv_nsec >= 500000000L);
  34
  35   return result;
  36 }