Create an R6 listener using IPv4/IPv6 endpoint fallback.
Arguments
- address
Local hostname, IP address, endpoint, or NULL for wildcard.
- port
Optional port when it is not embedded in address.
- backlog
Maximum pending connection queue length.
- reuse_address
Whether to set SO_REUSEADDR.
- cloexec
Whether to set close-on-exec.
- prefer
Address families to try, in order.
Value
A listening Socket R6 object.