to the corresponding host name.
This is done by resolving
to a host name and then ensuring that the host name resolves
must point to a buffer of at least
bytes, and will always be written to by this function.
If the name resolution does not work both ways or if the host name is longer
with NI_NUMERICHOST specified, is used to convert
to an ASCII form.
If the string written to
will not be NUL terminated.