hurd/fd-close.c

   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 }