Wait for a Socket to Become Writable

See more Socket/SSL/TLS Examples

Demonstrates Socket.SelectForWriting, which waits for the socket, or sockets in a socket set, to become writable. It returns 1 if writable, 0 on timeout, or -1 on error.

func chilkatTest() {
    var success: Bool = false

    let socket = CkoSocket()!

    //  Connect to the server using TLS.
    var bTls: Bool = true
    var maxWaitMs: Int = 5000
    success = socket.connect(hostname: "example.com", port: 5000, ssl: bTls, maxWaitMs: maxWaitMs)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    //  Wait up to 5 seconds for the socket (or sockets in a socket set) to become writable.  Returns 1 if
    //  writable, 0 on timeout, or -1 on error.
    var ready: Int = socket.select(forWriting: 5000).intValue
    if ready < 0 {
        print("\(socket.lastErrorText!)")
        return
    }

    if ready != 1 {
        print("The socket did not become writable before the timeout.")
        return
    }

    print("The socket is ready for writing.")

}