$OpenBSD: patch-libpisock_unixserial_c,v 1.3 2008/01/20 15:19:31 ajacoutot Exp $
--- libpisock/unixserial.c.orig	Thu Oct 12 16:21:23 2006
+++ libpisock/unixserial.c	Thu Jan 17 09:00:40 2008
@@ -161,13 +161,23 @@ s_open(pi_socket_t *ps, struct pi_sockaddr *addr, size
 
 	struct pi_serial_data *data =
 		(struct pi_serial_data *)ps->device->data;
+#define maxretries 100
+	int	retries;
 	
 #ifndef SGTTY
 	struct termios tcn;
 #else
 	struct sgttyb tcn;
 #endif
-	if ((fd = open(tty, O_RDWR | O_NONBLOCK)) < 0) {
+
+	for (retries = 0 ; retries <= maxretries ; retries++ ) {
+		if ((fd = open(tty, O_RDWR | O_NONBLOCK)) != -1) {
+			break;
+		}
+		usleep(50000);
+	}
+
+	if (fd == -1) {
 		ps->last_error = PI_ERR_GENERIC_SYSTEM;
 		return PI_ERR_GENERIC_SYSTEM;	/* errno already set */
 	}