hurd/fd-close.c

   1 /* Copyright (C) 1994-2021 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <hurd/fd.h>
  19
  20 error_t
  21 _hurd_fd_close (struct hurd_fd *fd)
  22 {
  23   error_t err;
  24
  25   HURD_CRITICAL_BEGIN;
  26
  27   __spin_lock (&fd->port.lock);
  28   if (fd->port.port == MACH_PORT_NULL)
  29     {
  30       __spin_unlock (&fd->port.lock);
  31       err = EBADF;
  32     }
  33   else
  34     {
  35       /* Clear the descriptor's port cells.
  36          This deallocates the ports if noone else is still using them.  */
  37       _hurd_port_set (&fd->ctty, MACH_PORT_NULL);
  38       _hurd_port_locked_set (&fd->port, MACH_PORT_NULL);
  39       err = 0;
  40     }
  41
  42   HURD_CRITICAL_END;
  43
  44   return err;
  45 }