Return the match for key in map mapname, or raise an
error (nis.error) if there is none.
Both should be strings, key is 8-bit clean.
Return value is an arbitrary array of bytes (may contain NULL
and other joys).
Note that mapname is first checked if it is an alias to another
name.
Return a dictionary mapping key to value such that
match(key, mapname)==value.
Note that both keys and values of the dictionary are arbitrary
arrays of bytes.
Note that mapname is first checked if it is an alias to another
name.