Add an example of how to set up a 3-wire serial terminal.

Usually, getty(8) does the trick, but if you just need a
serial console without getty(8), here's how.

1 files changed, 17 insertions, 2 deletions

diff --git a/etc/rc.d/serial b/etc/rc.d/serial
index e586e7352b27..f53f40c65bec 100644
--- a/etc/rc.d/serial
+++ b/etc/rc.d/serial
@@ -130,18 +130,33 @@ terminal() {
 	done
 }
 
+3wire() {
+	# 3-wire serial terminals.  These don't supply carrier, so
+	# clocal needs to be set, and crtscts needs to be unset.
+
+	dc=$1; shift
+
+	terminal ${dc} $*
+	for i in $*
+	do
+		stty < /dev/tty${dc}${i}.init clocal -crtscts
+		stty < /dev/cua${dc}${i}.init clocal -crtscts
+	done
+}
+
 # Don't use anything from this file unless you have some buggy programs
 # that require it.
 
 # Edit the functions and the examples to suit your system.
-# $1 is the call in device identifier, $2 is the call out device identifier
-# and the remainder of the line lists the device numbers.
+# $1 is the device identifier, and the remainder of the line
+# lists the device numbers.
 
 # Initialize assorted 8250-16550 (sio) ports.
 # maybe    d  0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v
 # mouse    d      2
 # modem    d    1
 # terminal d  0
+# 3wire    d  0
 
 # Initialize all ports on a Cyclades-8yo.
 # modem    c  00 01 02 03 04 05 06 07