September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Broadcasting to Multiple Machines
Finally we’ll see how to set up a broadcast channel. This code is simple.
| broadcast.erl | |
| | -module(broadcast). |
| | -compile(export_all). |
| | |
| | send(IoList) -> |
| | case inet:ifget("eth0", [broadaddr]) of |
| | {ok, [{broadaddr, Ip}]} -> |
| | {ok, S} = gen_udp:open(5010, [{broadcast, true}]), |
| | gen_udp:send(S, Ip, 6000, IoList), |
| | gen_udp:close(S); |
| | _ -> |
| | io:format("Bad interface name, or\n" |
| | "broadcasting not supported\n") |
| | end. |
| | |
| | listen() -> |
| | {ok, _} = gen_udp:open(6000), |
| | loop(). |
| | loop() -> |
| | receive |
| | Any -> |
| | io:format("received:~p~n", [Any]), |
| | loop() |
| | end. |
Here we need two ports, one to send the broadcast and the other to listen for answers. We’ve chosen port 5010 to send the broadcast request ...
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