Packet-oriented networking - Factor Documentation (original) (raw)
A packet-oriented socket can be opened with this word:
( addrspec -- datagram )
Packets can be sent and received with a pair of words: send ( bytes addrspec datagram -- ) receive ( datagram -- bytes addrspec )
Packet-oriented sockets are closed by calling dispose.
Address specifiers have the following interpretation with packet-oriented networking words:
| • | local - Unix domain datagram sockets on Unix systems |
|---|---|
| • | inet4 - a TCP/IP connection to an IPv4 address and port number; no name lookup is performed |
| • | inet6 - a TCP/IP connection to an IPv6 address and port number; no name lookup is performed |
The inet address specifier is not supported by the send word because a single host name can resolve to any number of IPv4 or IPv6 addresses, therefore there is no way to know which address should be used. Applications should call resolve-host then use some kind of strategy to pick the correct address (for example, by sending a packet to each one and waiting for a response, or always assuming IPv4).