[mythtv-users] Restart Myth by remote control

[Eni Gma]

I handle my Myth process precisely as you describe, Dan.  Although I am 
not using CVS, I do get my share of segfaults.  I just respawn a script 
out of inittab (I run Myth in a custom runlevel 4)  that restarts all my 
myth services if Myth fails.  I actually restart the whole GUI when myth 
dies (or I kill it) but it could easily be modified to only loop around 
myth.  My only problem now is when myth freezes up, rather than 
crashing.  I will most likely have to implement a kill switch anyway :( 
 Here are my scripts:

In /etc/inittab (this technically does not need to be a respawn, but I 
did it anyway just for kicks):
...
# MythTV respawns in runlevel 4
xm:4:respawn:/usr/local/bin/mythinit
...

/usr/local/bin/mythinit:

#!/bin/bash
export DISPLAY=localhost:0
SPAWNLIMIT=10
# We'll hang up in here, just for runlevel 4
x=0
while [ true ]; do
        #Start X
        /usr/X11R6/bin/X > /var/log/xout.log 2>&1 &
        echo "X starting:PID $!"
        sleep 5
        /usr/X11R6/bin/blackbox &
        echo "Blackbox starting:PID $!"
        # Don't let screen blank
        /usr/X11R6/bin/xset -dpms s off
        ## Start Myth
        echo "Starting Myth"
        /usr/local/bin/mythfrontend >> /var/log/myth.log 2>&1 &
        MYTHPID=$!
        echo "MythTV started, PID $MYTHPID"
        echo "Starting Irxevent"
        /etc/init.d/irx start
        wait $MYTHPID
        echo "MYTH DIED, RESTARTING ALL SERVICES"
        /etc/init.d/irx stop
        pkill blackbox
        pkill X
        # Wait for processes to exit before restarting
        sleep 4
        # Count the number of times we have done this, sleep if we 
respawn too much
        x=$(( $x + 1 ))
        if [ $x -gt $SPAWNLIMIT ]; then
                echo "ERROR: Myth respawing too much, disabling for 10 
minutes"
                sleep 600
                x=0
        fi
done


You could just run /usr/local/bin/mythfrontend out of inittab and it 
will reliably stay up (barring freezes).


Dan Conti wrote:

>Why not have a script that runs mythfrontend in the foreground in a loop,
>and whenever the process exits it checks the error code. Intentional exits
>should give back 0, and crashes should give back nonzero, so the script
>could automagically start mythfrontend again on nonzero results. Then
>start the script in the background.
>
>I guess another factor is that if you are using CVS and getting segfaults
>it would be of more use to actually track these in hopes of debugging
>them, rather than work around them as best as possible..
>
>On Wed, 23 Apr 2003, ben wrote:
>
>  
>
>>Just thought I'd share a little idea I had.  Since Mythfrontend still
>>has a seg fault every now and then, and since my wife doesn't understand
>>how to restart Mythfront end.  I mapped one of my remote keys to a
>>script that restarts mythfrontend.  The basic gist is this.  I'm using
>>Xdialog (http://www.chez.com/godefroy/) to display a window that you can
>>select to restart or not, thus avoiding accidental restarts. If you
>>don't want to do this you can just ignore remove everything but the
>>killall and and mythfrontend commands.
>>
>>Script looks like this:
>>
>>#!/bin/sh
>>
>>Xdialog --title "Restart Mythtv" --yesno "Would you like to restart
>>MythTV?" 0 0
>>
>>if [ $? -eq 0 ]
>>then
>>    sudo killall mythfrontend
>>    mythfrontend &
>>fi
>>
>>Save this and store it somewher in you path.  I used /bin
>>
>>Next add this to your lircrc:
>>
>>begin
>>    prog = irexec
>>    button = tivo #Whatever Button you want to use
>>    config = RestartMyth.sh
>>End
>>
>>Finally, add irexec to whatever script you are using to start irxevent.
>>
>>Now you have a restart key.  Makes the Spousal Approval Level much
>>higher.
>>
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>>
>>    
>>
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