Restart automatically if application gets killed

Question

I have this issue for two precise applications:
1. Mplayer - Wich I use as wallpaper but sometimes gets killed
2. Osdlyrics - It gest killed for no special reason (Seg fault)
I want to make a script so this applications be restarted in case they get killed, how could I track that and restart it?
Thank you

Answer 1

OK I'll show you what I have :
[Service]
Type=simple
ExecStart=/usr/bin/wallpaper
ExecStartPre=/usr/bin/xfdesktop
Restart=always
systemd status wallpaper.service throws:
wallpaper.service
Loaded: loaded (/etc/systemd/system/wallpaper.service; static)
Active: failed (Result: start-limit) since sáb 2013-11-02 12:10:38 CST; 11s ago
Process: 13911 ExecStartPre=/usr/bin/xfdesktop (code=exited, status=1/FAILURE)
Main PID: 1743 (code=exited, status=0/SUCCESS)
If I remove the line of xfdesktop the output shows as active but nothing is displaying
THis is my /usr/bin/wallpaper :
#!/bin/bash
WIND=$(xwininfo -name Escritorio | egrep -E '0x' | cut -d':' -f3 | cut -d'"' -f1| cut -d' ' -f2)
echo "Desktop is " $WIND
mkfifo /tmp/mplayer-control
touch /tmp/wallpaper-status
DesktopMovie -wid $WIND -x 1366 -y 768 -slave -input file=/tmp/mplayer-control -shuffle -loop 0 -playlist /home/axelectrik/.config/wallpaper/playlist.m3u &> /tmp/wallpaper-status &
echo "Playing" $WIND
ANd the output of /tmp/wallpaper-status is:
Cannot find HOME directory.
The wid option must be an integer: -x
Error parsing commandline option "-wid": Option parameter could not be parsed
MPlayer2 2.0-726-g6c87a98 (C) 2000-2012 MPlayer Team
So I don't know why the service cannot start xfdesktop, or if is already started why xwininfo is not giving the xfdesktop window ID so mplayer starts over there.
Last edited by axelectrik (2013-11-02 18:23:21)