1  /* Open a directory stream from a file descriptor.  Hurd version.
       2     Copyright (C) 2005-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <dirent.h>
      20  #include <errno.h>
      21  #include <hurd.h>
      22  #include <hurd/fd.h>
      23  #include <fcntl.h>
      24  
      25  DIR *_hurd_fd_opendir (struct hurd_fd *d); /* opendir.c */
      26  
      27  /* Open a directory stream on FD.  */
      28  DIR *
      29  __fdopendir (int fd)
      30  {
      31    struct hurd_fd *d = _hurd_fd_get (fd);
      32  
      33    if (d == NULL)
      34      return __hurd_fail (EBADF), NULL;
      35  
      36    /* Ensure that it's a directory.  */
      37    error_t err = HURD_FD_PORT_USE
      38      (d, ({
      39  	file_t dir = __file_name_lookup_under (port, "./",
      40  					       O_DIRECTORY | O_NOTRANS, 0);;
      41  	if (dir != MACH_PORT_NULL)
      42  	  __mach_port_deallocate (__mach_task_self (), dir);
      43  	dir != MACH_PORT_NULL ? 0 : errno;
      44        }));
      45  
      46    if (err)
      47      return __hurd_dfail (fd, err), NULL;
      48  
      49    return _hurd_fd_opendir (d);
      50  }
      51  weak_alias (__fdopendir, fdopendir)