Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family)
Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only){    if (stack != NULL)	return stack->newlistener(srcaddr, port, plug, local_host_only);    return NULL;}