(issue #33) use of time.Sleep() prior to ptmx.Close() in xsd.runShellAs()

Hack to enable server to complete sending data to client (eg. xs -x "ls /foo" losing end of output)

xsd/xsd.go

@@ -327,6 +327,16 @@ func runShellAs(who, hname, ttype, cmd string, interactive bool, //nolint:funlen
 	// #gv:s/label=\"runShellAs\$1\"/label=\"deferPtmxClose\"/
 	defer func() {
 		//logger.LogDebug(fmt.Sprintf("[Exited process was %d]", c.Process.Pid))
+
+		//Ensure socket has sent all data to client prior to closing
+		//NOTE: This is not ideal, as it would be better to somehow
+		//determine if there is any pending outgoing (write) data to the
+		//underlying socket (TCP/KCP) prior to closing; however Go's net pkg
+		//completely hides lower-level stuff. net.Conn.Close() according to
+		//docs sends written data in the background, so how best to determine
+		//all data has been sent? -rlm 2022-10-04
+
+		time.Sleep(100 * time.Millisecond) //Empirically determined :^/
 		_ = ptmx.Close()
 	}()