* cygwin.din: Export fdopendir.

* dir.cc (opendir): Call fhandler's opendir with fd set to -1.
	(fdopendir): New function.
	(seekdir64): Use dirent_info_mask.
	(rewinddir): Ditto.
	(closedir): Only release underlying file descriptor if it has been
	reserved by opendir itself.
	* fhandler.cc (fhandler_base::opendir): Accommodate new parameter.
	* fhandler.h (dirent_states): Add dirent_valid_fd and dirent_info_mask.
	(fhander_XXX::opendir): Add file descriptor parameter.  Use regparms.
	(fhandler_procnet::opendir): Drop declaration.
	* fhandler_disk_file.cc (fhandler_disk_file::opendir): Ditto.
	If called from fdopendir, use existing handle to re-open directory
	with valid flags.  Rename fd to cfd.  Use only if no valid incoming fd.
	(fhandler_cygdrive::opendir): Accommodate new parameter.
	* fhandler_process.cc (fhandler_process::opendir): Ditto.
	* fhandler_procnet.cc (fhandler_procnet::opendir): Drop definition.
	* fhandler_virtual.cc (fhandler_virtual::opendir): Accommodate new
	parameter.  Only create new file descriptor entry if called from
	opendir.  Remove duplicated setting of dir->__flags.
	* posix.sgml: Add fdopendir to list of implemented Solaris functions.
	* include/cygwin/version.h: Bump API minor number.
	* include/sys/dirent.h: Declare fdopendir.

winsup/cygwin/include/sys/dirent.h

@@ -1,6 +1,6 @@
 /* Posix dirent.h for WIN32.
 
-   Copyright 2001, 2002, 2003, 2005, 2006 Red Hat, Inc.
+   Copyright 2001, 2002, 2003, 2005, 2006, 2007 Red Hat, Inc.
 
    This software is a copyrighted work licensed under the terms of the
    Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
@@ -56,6 +56,7 @@ typedef struct __DIR
 #pragma pack(pop)
 
 DIR *opendir (const char *);
+DIR *fdopendir (int);
 struct dirent *readdir (DIR *);
 int readdir_r (DIR *, struct dirent *, struct dirent **);
 void rewinddir (DIR *);