Created
January 17, 2011 17:22
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-module(listener). | |
-behaviour(gen_server). | |
-export([start_link/0, stop/0]). | |
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, | |
terminate/2, code_change/3]). | |
-export([accept/1]). | |
-export([receive_loop/1]). | |
-record(state, { | |
% listen socket | |
listener | |
}). | |
-define(SERVER, ?MODULE). | |
start_link() -> | |
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []). | |
accept(Socket) -> | |
case gen_tcp:accept(Socket) of | |
{ok, Sock} -> | |
spawn(?MODULE, receive_loop, [Sock]), | |
accept(Socket); | |
{error, Reason} -> | |
Reason | |
end. | |
receive_loop(Socket) -> | |
case gen_tcp:recv(Socket, 0) of | |
{ok, Data} -> | |
case Data of | |
<<"q\r\n">> -> | |
gen_tcp:send(Socket, "quit \n"), | |
gen_tcp:close(Socket); | |
_ -> | |
receive_loop(Socket) | |
end; | |
{error, closed} -> | |
ok | |
end. | |
stop() -> | |
io:format("server stop! \n "), | |
gen_server:cast(?MODULE, stop). | |
% | |
% Callback functions | |
% | |
init([]) -> | |
Port = 110, | |
Opts = [binary, {reuseaddr, true}, | |
{keepalive, false}, {backlog, 30}, {active, false}], | |
case gen_tcp:listen(Port, Opts) of | |
{ok, ListenSocket} -> | |
spawn(?MODULE, accept, [ListenSocket]), | |
{ok, #state{ listener = ListenSocket}}; | |
{error, Reason} -> | |
{stop, Reason} | |
end. | |
handle_call(_Request, _From, State) -> | |
Reply = ok, | |
{reply, Reply, State}. | |
handle_cast(stop, State) -> | |
{stop, normal, State}. | |
handle_info(_Info, State) -> | |
{noreply, State}. | |
% | |
% | |
% terminate server | |
% | |
terminate(_Reason, State) -> | |
gen_tcp:close(State#state.listener), | |
ok. | |
% | |
% Hot code change | |
% | |
code_change(_OldVsn, State, _Extra) -> | |
{ok, State}. | |
% |
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