Udev bash script for autodialing usb huawei modem

Question

Hey
I've got an interesting one here.
I have scripted up a bash script to be triggered by a udev add event for my usb modem. As far as I can tell the udev event is firing correctly according to udevadm.
ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1003", RUN+="/bin/sh /usr/local/bin/huawei_key.sh add"
ACTION=="remove", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1003", RUN+="/bin/sh /usr/local/bin/huawei_key.sh remove"
And heres the code from the script
#!/bin/bash
#returns
# 0 Successfully ran script for case
# 1 wvdial process already running
# 2 wvdial was not terminated
# 3 script was not ran with ADD or REMOVE events
function getpid #get process id of running program
pidof wvdial
if [ "$?" = 0 ];
then
pid=`pidof wvdial`
running=1
else
running=0
fi
function checkrun #check for a running copy of the program
pidof wvdial
if [ "$?" == "0" ];
then
running=1
else
running=0
fi
function killloop #a set of time kill commands to let the program exit gracefully
#two terms, one int and one kill with suitable gaps
getpid
checkrun
if [ "$running" = "0" ];
then
return
fi
kill $pid
sleep 10
checkrun
if [ "$running" = "0" ];
then
return
fi
kill $pid
sleep 10
checkrun
if [ "$running" = "0" ];
then
return
fi
kill -INT $pid
sleep 5
checkrun
if [ "$running" = "0" ];
then
return
fi
kill -KILL $pid
sleep 5
checkrun
if [ "$running" = "1" ];
then
exit 2 #process fails to die
fi
function getlaststatus
if [ -e "/var/run/huawie" ];
then
last=`cat /var/run/huawie`
else
last=0
fi
if [ "$1" = "add" ];
then
getlaststatus
if [ "$last" = "1" ];
then
exit 1
fi
echo 1 > /var/run/huawie #block future udev events
getpid
if [ "$running" = "1" ];
then
exit 1
fi
modprobe usbserial
sleep 6 #modem init time
wvdial &
exit 0
elif [ "$1" = "remove" ];
then
getlaststatus
if [ "$last" = "2" ];
then
exit 0
fi
echo 2 > /var/run/huawie
killloop
exit 0
else
echo 3 > /var/run/huawie
exit 3
fi
I'd appreciate any ideas, this one has me stumped
Edit:
Forgot to add that when I call the script manually it works like a charm.
Last edited by adamd (2009-08-25 15:04:06)

Answer 1

Hey
I've got an interesting one here.
I have scripted up a bash script to be triggered by a udev add event for my usb modem. As far as I can tell the udev event is firing correctly according to udevadm.
ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1003", RUN+="/bin/sh /usr/local/bin/huawei_key.sh add"
ACTION=="remove", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1003", RUN+="/bin/sh /usr/local/bin/huawei_key.sh remove"
And heres the code from the script
#!/bin/bash
#returns
# 0 Successfully ran script for case
# 1 wvdial process already running
# 2 wvdial was not terminated
# 3 script was not ran with ADD or REMOVE events
function getpid #get process id of running program
pidof wvdial
if [ "$?" = 0 ];
then
pid=`pidof wvdial`
running=1
else
running=0
fi
function checkrun #check for a running copy of the program
pidof wvdial
if [ "$?" == "0" ];
then
running=1
else
running=0
fi
function killloop #a set of time kill commands to let the program exit gracefully
#two terms, one int and one kill with suitable gaps
getpid
checkrun
if [ "$running" = "0" ];
then
return
fi
kill $pid
sleep 10
checkrun
if [ "$running" = "0" ];
then
return
fi
kill $pid
sleep 10
checkrun
if [ "$running" = "0" ];
then
return
fi
kill -INT $pid
sleep 5
checkrun
if [ "$running" = "0" ];
then
return
fi
kill -KILL $pid
sleep 5
checkrun
if [ "$running" = "1" ];
then
exit 2 #process fails to die
fi
function getlaststatus
if [ -e "/var/run/huawie" ];
then
last=`cat /var/run/huawie`
else
last=0
fi
if [ "$1" = "add" ];
then
getlaststatus
if [ "$last" = "1" ];
then
exit 1
fi
echo 1 > /var/run/huawie #block future udev events
getpid
if [ "$running" = "1" ];
then
exit 1
fi
modprobe usbserial
sleep 6 #modem init time
wvdial &
exit 0
elif [ "$1" = "remove" ];
then
getlaststatus
if [ "$last" = "2" ];
then
exit 0
fi
echo 2 > /var/run/huawie
killloop
exit 0
else
echo 3 > /var/run/huawie
exit 3
fi
I'd appreciate any ideas, this one has me stumped
Edit:
Forgot to add that when I call the script manually it works like a charm.
Last edited by adamd (2009-08-25 15:04:06)