host

A pointer to receive the host name. The host name will be NULL terminated. NULL can be passed for this call argument. 

host_len

An optional pointer to a size_t to receive the length in bytes of the returned host name. This length does not include the NULL terminator that terminates the host name. A value of NULL can be passed for this call argument.

item_code

An optional list of item codes. The list must be terminated with an integer argument with value 0.