Hi,
I have several USB serial ports on a machine and I don't want to rely on attach
order to get various programs to talk to the correct serial port.
I wrote the following devd script and shell script to create symlinks from
cu.${sernum}/tty.${sernum} to the real device nodes.
I post it here in the hope other people find it useful.
[maarsytest 2:49] ~> cat /usr/local/etc/devd/usbserialsn.conf
attach 100 {
device-name ".*";
match "ttyname" ".+";
match "ugen" ".+";
match "sernum" ".+";
action "/usr/local/libexec/usbserialsn attach $device-name $sernum
$ttyname";
};
detach 100 {
device-name ".*";
action "/usr/local/libexec/usbserialsn detach $device-name";
};
[maarsytest 2:49] ~> cat /usr/local/libexec/usbserialsn
#!/bin/sh
if [ $# -lt 2 ]; then
echo "Bad usage"
exit 1
fi
mode=$1
devname=$2
sernum=$3
ttyname=$4
case "$mode" in
attach)
if [ $# -ne 4 ]; then
echo "Bad usage"
exit 1
fi
ln -sf cua${ttyname} /dev/cu.${sernum}
ln -sf tty${ttyname} /dev/tty.${sernum}
echo ${sernum} >/var/run/usbserialsn.${devname}
;;
detach)
if [ $# -ne 2 ]; then
echo "Bad usage"
exit 1
fi
if [ ! -e /var/run/usbserialsn.${devname} ]; then
exit 0
fi
sernum=$(cat /var/run/usbserialsn.${devname})
rm -f /dev/cu.${sernum} /dev/tty.${sernum} /var/run/usbserialsn.${devname}
;;
*)
echo "Unknown mode"
exit 1
;;
esac
It would be a lot simpler if devd reported the same things on detach as it does
on attach but I am not sure how difficult that would be to achieve (presumably
it would require caching them).
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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