hurd/fd-close.c


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/* Copyright (C) 1994, 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <hurd/fd.h>

error_t
_hurd_fd_close (struct hurd_fd *fd)
{
  error_t err;

  HURD_CRITICAL_BEGIN;

  __spin_lock (&fd->port.lock);
  if (fd->port.port == MACH_PORT_NULL)
    {
      __spin_unlock (&fd->port.lock);
      err = EBADF;
    }
  else
    {
      /* Clear the descriptor's port cells.
	 This deallocates the ports if noone else is still using them.  */
      _hurd_port_set (&fd->ctty, MACH_PORT_NULL);
      _hurd_port_locked_set (&fd->port, MACH_PORT_NULL);
      err = 0;
    }

  HURD_CRITICAL_END;

  return err;
}