sysdeps/mach/hurd/fdopendir.c

   1 /* Open a directory stream from a file descriptor.  Hurd version.
   2    Copyright (C) 2005, 2006 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <dirent.h>
  21 #include <errno.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24 #include <fcntl.h>
  25
  26 DIR *_hurd_fd_opendir (struct hurd_fd *d); /* opendir.c */
  27
  28 /* Open a directory stream on FD.  */
  29 DIR *
  30 __fdopendir (int fd)
  31 {
  32   struct hurd_fd *d = _hurd_fd_get (fd);
  33
  34   if (d == NULL)
  35     {
  36       errno = EBADF;
  37       return NULL;
  38     }
  39
  40   /* Ensure that it's a directory.  */
  41   error_t err = HURD_FD_PORT_USE
  42     (d, ({
  43         file_t dir = __file_name_lookup_under (port, "/",
  44                                                O_DIRECTORY | O_NOTRANS, 0);;
  45         if (dir != MACH_PORT_NULL)
  46           __mach_port_deallocate (__mach_task_self (), dir);
  47         dir != MACH_PORT_NULL ? 0 : errno;
  48       }));
  49
  50   if (err)
  51     {
  52       errno = err;
  53       return NULL;
  54     }
  55
  56   return _hurd_fd_opendir (d);
  57 }
  58 weak_alias (__fdopendir, fdopendir)