1  /* Copyright (C) 1994-2023 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 no one 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  }