* Makefile.in (DLL_OFILES): Add fhandler_procsys.o.

* devices.h (enum fh_devices): Add FH_PROCSYS.
	* devices.in (dev_procsys_storage): New device.
	* devices.cc: Regenerate.
	* dtable.cc (build_fh_pc): Add code to allocate fhandler_procsys.
	* fhandler.h (proc_len): Convert to size_t.
	(procsys): Declare.
	(procsys_len): Declare.
	(enum virtual_ftype_t): Move here from fhandler_virtual.h.
	Add members supported by fhandler_procsys.
	(fhandler_virtual::exists): Return virtual_ftype_t.  Change
	in all derived classes.
	(class fhandler_procsys): New class.
	(fhandler_union): Add fhandler_procnet and fhandler_procsys members.
	* fhandler_disk_file.cc (__DIR_mounts::check_missing_mount): Use
	ro_u_proc.
	(fhandler_base::fstat_by_handle): Don't copy attributes if file is an
	NT device.
	(fhandler_base::fstat_by_name): Ditto.
	* fhandler_netdrive.cc (fhandler_netdrive::exists): Return
	virtual_ftype_t.
	* fhandler_proc.cc (proc_tab): Sort alphabetically.  Use _VN macro
	to store length.
	(proc_len): Change to size_t.
	(proc_tab_cmp): New static function.
	(virt_tab_search): New function to search entry in virt_tab_t
	arrays.  Use throughout in /proc and sibling classes instead of
	loop.
	(fhandler_proc::exists): Return virtual_ftype_t.
	* fhandler_process.cc (process_tab): Sort alphabetically.  Use _VN
	macro to store length.
	(fhandler_process::exists): Return virtual_ftype_t.
	(fhandler_process::open): Simplify code.
	* fhandler_procnet.cc (procnet_tab): Sort alphabetically.  Use _VN
	macro to store length.
	(fhandler_procnet::exists): Return virtual_ftype_t.
	(fhandler_procnet::open): Simplify.
	* fhandler_procsys.cc: New file.
	* fhandler_registry.cc (fhandler_registry::exists): Return
	virtual_ftype_t.
	* fhandler_virtual.cc (fhandler_virtual::exists): Ditto.
	* fhandler_virtual.h (enum virtual_ftype_t): Move to fhandler.h.
	(virt_tab_t): Add name_len member.
	(_VN): New macro.
	(virt_tab_search): Declare.
	* mount.cc (mount_info::conv_to_win32_path): Fix comment.  Backslashify
	isprocsys_dev paths.
	* ntdll.h (STATUS_OBJECT_TYPE_MISMATCH): Define
	(STATUS_INSTANCE_NOT_AVAILABLE): Define.
	(STATUS_PIPE_NOT_AVAILABLE): Define.
	(STATUS_INVALID_PIPE_STATE): Define.
	(STATUS_PIPE_BUSY): Define.
	(SYMBOLIC_LINK_QUERY): Define.
	(NtOpenSymbolicLinkObject): Declare.
	(NtQuerySymbolicLinkObject): Declare.
	* path.cc (path_conv::check): Accommodate fact that exists method
	returns virtual_ftype_t now.  Add cases for new virtual_ftype_t
	types.
	(cygwin_conv_path): Add GLOBALROOT prefix to native device paths.
	Make sure to strip \\?\ prefix only for actual filesystem-based
	paths, not for all paths.
	* path.h (isproc_dev): Add FH_PROCSYS.
	(isprocsys_dev): Define.

winsup/cygwin/fhandler_netdrive.cc

@@ -145,14 +145,14 @@ create_thread_and_wait (int what, PVOID in, PVOID out, DWORD outsize,
 
 /* Returns 0 if path doesn't exist, >0 if path is a directory,
    -1 if path is a file, -2 if it's a symlink.  */
-int
+virtual_ftype_t
 fhandler_netdrive::exists ()
 {
   char *to;
   const char *from;
   size_t len = strlen (get_name ());
   if (len == 2)
-    return 1;
+    return virt_rootdir;
   char namebuf[len + 1];
   for (to = namebuf, from = get_name (); *from; to++, from++)
     *to = (*from == '/') ? '\\' : *from;
@@ -166,7 +166,7 @@ fhandler_netdrive::exists ()
 				      &nr, &nh, 0, "WNetOpenEnum");
   if (nh.dom)
     WNetCloseEnum (nh.dom);
-  return ret != NO_ERROR ? 0 : 1;
+  return ret != NO_ERROR ? virt_none : virt_directory;
 }
 
 fhandler_netdrive::fhandler_netdrive ():