+
−-- Monkeypatch to support socket activation
+
−--
+
−-- Requires LuaSocket after "agnostic" changes merged
+
−--
+
−-- To enable:
+
−-- RunScript "socket-activation.lua"
+
−
+
−local socket = require"socket";
+
−local tcp_serv_mt = debug.getregistry()["tcp{server}"];
+
−local socket_bind = socket.bind;
+
−
+
−local SD_LISTEN_FDS_START = 3;
+
−
+
−local fds = tonumber(os.getenv"LISTEN_FDS") or 0;
+
−
+
−if fds < SD_LISTEN_FDS_START then return; end
+
−
+
−local servs = {};
+
−
+
−for i = 1, fds do
+
−	local serv = socket.tcp();
+
−	if serv:getfd() >= 0 then
+
−		return; -- This won't work, we will leak the old FD
+
−	end
+
−	debug.setmetatable(serv, tcp_serv_mt);
+
−	serv:setfd(SD_LISTEN_FDS_START + i - 1);
+
−	local ip, port = serv:getsockname();
+
−	servs [ ip .. ":" .. port ] = serv;
+
−end
+
−
+
−function socket.bind( ip, port, backlog )
+
−	local sock = servs [ ip .. ":" .. port ];
+
−	if sock then
+
−		servs [ ip .. ":" .. port ] = nil;
+
−		return sock;
+
−	end
+
−	if next(servs) == nil then
+
−		-- my work here is done
+
−		socket.bind = socket_bind;
+
−	end
+
−	return socket_bind( ip, port, backlog );
+
−end