06 January 2013

LXDM PostLogout script to shutdown user's apps

LXDM is a bit strange in it's behaviour to not to kill your apps running when you log out. After logging out my deadbeef continues to play music and conky is still drawn on top of LXDM greeter. Look funny heh :)
I don't really like this, but I wanted DM to show list of users instead of simple prompt. Arch wiki suggests just to killall --user $USER which would also kill all your background processes they may be running (torrent, screen, etc).
Enough words - here goes the script:
$ cat /etc/lxdm/PostLogout 
# Note: this is a sample and will not be run as is.

current_windows=`xlsclients -al | grep Window | cut -d' ' -f2 | sed -e 's/:$//'`
for wid in $current_windows
        pid=`xprop -id ${wid} _NET_WM_PID | awk -F ' = ' '{ print $2 }'`
        wmname=`xprop -id ${wid} WM_CLASS | cut -d= -f2 | cut -d, -f2 | sed -e 's/[ "]//g'`
        if [ "p${pid}" != "p" ]
                echo "Killing ${wmname} (${pid})"
                kill ${pid}
                echo "No PID found for ${wmname}"

# for some reason PID for conky cannot be determined
killall --user $USER conky
It requires xlsclients and xprop. Some apps (like conky) are special case and they don't show their PID in X11 properties of a window, so they are killed separately.