sysdeps/mach/hurd/fdopendir.c

   1 /* Open a directory stream from a file descriptor.  Hurd version.
   2    Copyright (C) 2005-2019 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    <http://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     {
  35       errno = EBADF;
  36       return NULL;
  37     }
  38
  39   /* Ensure that it's a directory.  */
  40   error_t err = HURD_FD_PORT_USE
  41     (d, ({
  42         file_t dir = __file_name_lookup_under (port, "/",
  43                                                O_DIRECTORY | O_NOTRANS, 0);;
  44         if (dir != MACH_PORT_NULL)
  45           __mach_port_deallocate (__mach_task_self (), dir);
  46         dir != MACH_PORT_NULL ? 0 : errno;
  47       }));
  48
  49   if (err)
  50     {
  51       errno = err;
  52       return NULL;
  53     }
  54
  55   return _hurd_fd_opendir (d);
  56 }
  57 weak_alias (__fdopendir, fdopendir)