[PD] watchdog

[Roman Haefeli]

On Thu, 2018-05-03 at 06:29 +0200, michael strohmann wrote:
> Hello, 
> i wonder if it is possible to setup something on raspberry, so that
> the puredata-watchdog will restart pd-0.48.0 automatically?
> where could i look up the mechanics of this, unfortunatly i am not a
> unix crack…

Are you referring to the pd-watchdog binary, that comes with puredata-
core? Is your Raspberry Pi running Raspbian?

From what I understand, the purpose of the pd-watchdog is to pause Pd
in regular intervals when running in real-time mode. I think this is
measure to prevent Pd from locking up the system. Assume you
accidentally trigger an [until] without a stopping mechanism, thanks to
 pd-watchdog you're still able to move the mouse and quit Pd.

Is your goal to make sure that Pd is running at any time, so that it is
started again as soon as it stops?  Maybe you can achieve something
like this wit a shell script. I haven't tested this, but it might give
you an idea how to make it work:

---
#!/bin/sh

while true
do 
  # We start pd and send detach it from the terminal ('&')
  /usr/bin/pd -open yourpatch & 

  # we catch pd's process id
  pdpid=$!

  # now let's wait for the process to terminate
  wait $pdpid
  
  # once pd terminates, we start another iteration
  # of our while-loop
done
---

Roman
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