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glibc  2.9
fdopendir.c
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00001 /* Open a directory stream from a file descriptor.  Hurd version.
00002    Copyright (C) 2005, 2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <dirent.h>
00021 #include <errno.h>
00022 #include <hurd.h>
00023 #include <hurd/fd.h>
00024 #include <fcntl.h>
00025 
00026 DIR *_hurd_fd_opendir (struct hurd_fd *d); /* opendir.c */
00027 
00028 /* Open a directory stream on FD.  */
00029 DIR *
00030 __fdopendir (int fd)
00031 {
00032   struct hurd_fd *d = _hurd_fd_get (fd);
00033 
00034   if (d == NULL)
00035     {
00036       errno = EBADF;
00037       return NULL;
00038     }
00039 
00040   /* Ensure that it's a directory.  */
00041   error_t err = HURD_FD_PORT_USE
00042     (d, ({
00043        file_t dir = __file_name_lookup_under (port, "/",
00044                                           O_DIRECTORY | O_NOTRANS, 0);;
00045        if (dir != MACH_PORT_NULL)
00046          __mach_port_deallocate (__mach_task_self (), dir);
00047        dir != MACH_PORT_NULL ? 0 : errno;
00048       }));
00049 
00050   if (err)
00051     {
00052       errno = err;
00053       return NULL;
00054     }
00055 
00056   return _hurd_fd_opendir (d);
00057 }
00058 weak_alias (__fdopendir, fdopendir)