std.socket Socket.select failing on consecutive calls with listening socket

cc via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Sun Jul 31 01:00:02 PDT 2016


	Socket server = new TcpSocket();
	server.setOption(SocketOptionLevel.SOCKET, 
SocketOption.REUSEADDR, true);
	server.bind(new InternetAddress(8000));
	server.listen(8);

	auto set = new SocketSet();
	set.add(server);

	auto sel = Socket.select(set, null, null, msecs(0));
	Socket.select(set, null, null, msecs(0));

(Simplified from loop) On the second select call, fails with:

std.socket.SocketOSException at std\socket.d(3439): Socket select 
error: An invalid argument was supplied.


The ultimate goal is non-blocking accept calls.  I tried skipping 
the select() calls entirely and just setting  server.blocking = 
false;  and  auto client = server.accept();  every loop, but this 
resulted in accept() returning a non-null Socket object even when 
no client was connecting, and did not throw an exception to check 
for wouldHaveBlocked.  When I added the select statement to check 
for pending connections, the first iteration returns 0 
successfully, but the second iteration of the loop failed with 
the above message.

(DMD32 D Compiler v2.071.1 running on Windows 7 x64)


More information about the Digitalmars-d-learn mailing list