/* Implementation of the BSD usleep function using nanosleep.
   Copyright (C) 1996-1997, 1999, 2001-2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <time.h>
#include <unistd.h>

int
usleep (useconds_t useconds)
{
  unsigned int sec;
  unsigned int usec;
  struct timespec ts;

  /* POSIX:2001 says that useconds >= 1000000 is invalid; nevertheless let's
     be forgiving.  */
  if (__builtin_expect (useconds < 1000000, 1))
    {
      sec = 0;
      usec = useconds;
    }
  else
    {
      sec = useconds / 1000000;
      usec = useconds % 1000000;
    }

  ts.tv_sec = sec;
  ts.tv_nsec = usec * 1000;	/* Multiply as 32-bit integers.  */

  /* Note the usleep() is a cancellation point.  But since we call
     nanosleep() which itself is a cancellation point we do not have
     to do anything here.  */
  return __nanosleep (&ts, NULL);
}
