hurd/fd-close.c

   1 /* Copyright (C) 1994, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, 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 }