Subsequent connect() call shouldn't return EINPROGRESS (before the connection is established)

[korli]

​http://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html

If the connection cannot be established immediately and O_NONBLOCK is set for the file descriptor for the socket, connect() shall fail and set errno to [EINPROGRESS], but the connection request shall not be aborted, and the connection shall be established asynchronously. Subsequent calls to connect() for the same socket, before the connection is established, shall fail and set errno to [EALREADY].

See issue ​1568 at Haikuports for an example.

The error code seems to originate from ​https://github.com/haiku/haiku/blob/master/src/add-ons/kernel/network/protocols/tcp/TCPEndpoint.cpp#L607

	// Can only call connect() from CLOSED or LISTEN states
	// otherwise endpoint is considered already connected
	if (fState == LISTEN) {
		// this socket is about to connect; remove pending connections in the backlog
		gSocketModule->set_max_backlog(socket, 0);
	} else if (fState == ESTABLISHED) {
		return EISCONN;
	} else if (fState != CLOSED)
		return EINPROGRESS;

IMO the EINPROGRESS should be replaced with EALREADY.

[phoudoin]

Agreed, as the initial EINPROGRESS response is acually handed a bit bellow instead of blocking while waiting for handshake.

[korli]

Possible fix applied in hrev51358. Tested OK so far.

[korli]

No feedback from original reporter at HaikuPorts. Closing as fixed.