$NetBSD: patch-ad,v 1.2 2003/01/10 04:30:19 rh Exp $

--- libpisock/unixserial.c.orig	Tue Dec  3 00:32:47 2002
+++ libpisock/unixserial.c
@@ -178,13 +178,23 @@ s_open(struct pi_socket *ps, struct pi_s
 		i;
 	char 	*tty 	= addr->pi_device;
 	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)) == -1) {
+
+	for (retries = 0 ; retries <= maxretries ; retries++ ) {
+		if ((fd = open(tty, O_RDWR | O_NONBLOCK)) != -1) {
+			break;
+		}
+		usleep(50000);
+	}
+
+	if (fd == -1) {
 		return -1;	/* errno already set */
 	}