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[[!meta title="dir_lookup"]]

    routine dir_lookup (
    	start_dir: file_t;
    	RPT
    	file_name: string_t;
    	flags: int;
    	mode: mode_t;
    	out do_retry: retry_type;
    	out retry_name: string_t;
    	out result: mach_port_send_t);

Translate a file name, following all symlinks.  Upon return, if `do_retry` is
`FS_RETRY_MAGICAL` then `retry_name` specifies what to do, the list of
possibilities is documented in `<hurd/hurd_types.h>`; if `FS_RETRY_REAUTH`,
then `result` should be reauthenticated before being used.  If `retry_name` is
the empty string and the retry type is `FS_RETRY_NORMAL`, then no further
[[`dir_lookup`|dir_lookup]] calls are required; `result` is the port to use.
Otherwise the [[`dir_lookup`|dir_lookup]] call should be repeated, sent to
`result` (or the reauthenticated port) with `retry_name` passed for
`file_name`.  This call is required to be supported by all files (even
non-directories) if the filename is null, and should function in that case as a
re-open of the file.