Date: Thu, 3 Oct 2019 12:25:09 +0930 From: "O'Connor, Daniel" <darius@dons.net.au> To: freebsd-usb@freebsd.org Subject: USB serial ports by serial number Message-ID: <CC980A9B-8F41-4C2A-A729-2CC690DFDA7E@dons.net.au>
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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=3D$1
devname=3D$2
sernum=3D$3
ttyname=3D$4
case "$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=3D$(cat /var/run/usbserialsn.${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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