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+ せっかくだからErlang版も貼っとく。
+ じつはずっと昔に書いたコードだったりする。
+
+ {{{
+ -module(udpmsg).
+ -export([send/2]).
+
+ -include_lib("kernel/include/inet.hrl").
+
+ -define(IPMSG_VERSION, 16#0001).
+ -define(IPMSG_DEFAULT_PORT, 16#0979).
+ -define(IPMSG_SENDMSG, 16#020).
+
+ -define(DEFAULT_UDP_OPTS, [
+ {active, false},
+ % {broadcast, true},
+ {reuseaddr, true}
+ ]).
+
+ send_format(Num, Host, User, Cmd) ->
+ lists:flatten(io_lib:format("~.10b:~.10b:~s:~s:~.10b:", [?IPMSG_VERSION, Num, User, Host, Cmd])).
+ send_format(Num, Host, User, Cmd, Extra) ->
+ lists:flatten(io_lib:format("~.10b:~.10b:~s:~s:~.10b:~s", [?IPMSG_VERSION, Num, User, Host, Cmd, Extra])).
+
+ send(Host, Msg) ->
+ Num = erlang:phash(erlang:localtime(), 16777215),
+ case gen_udp:open(0, ?DEFAULT_UDP_OPTS) of
+ {ok, Socket} ->
+ EntMsg = send_format(Num, "myhost", "myname", ?IPMSG_SENDMSG, Msg),
+ gen_udp:send(Socket, Host, ?IPMSG_DEFAULT_PORT, EntMsg),
+ gen_udp:close(Socket);
+ Error ->
+ Error
+ end.
+ }}}