1: /* Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <hurd/fd.h>
   20: 
   21: error_t
   22: _hurd_fd_close (struct hurd_fd *fd)
   23: {
   24:   error_t err;
   25: 
   26:   HURD_CRITICAL_BEGIN;
   27: 
   28:   __spin_lock (&fd->port.lock);
   29:   if (fd->port.port == MACH_PORT_NULL)
   30:     {
   31:       __spin_unlock (&fd->port.lock);
   32:       err = EBADF;
   33:     }
   34:   else
   35:     {
   36:       /* Clear the descriptor's port cells.
   37:          This deallocates the ports if noone else is still using them.  */
   38:       _hurd_port_set (&fd->ctty, MACH_PORT_NULL);
   39:       _hurd_port_locked_set (&fd->port, MACH_PORT_NULL);
   40:       err = 0;
   41:     }
   42: 
   43:   HURD_CRITICAL_END;
   44: 
   45:   return err;
   46: }