'kill 0' from cron script kills crond

[Jeroen van der Vegt]

Hello, 


We're using Busybox on an embedded ARM platform. We'd like to have a script
running from cron every minute. To terminate any remaining child processes,
we'd like to perform the 'kill 0' command at the end of the script. This '0'
is a special argument. From e.g.
http://linux.about.com/od/commands/l/blcmdl1_kill.htm :

..... 
0
    All processes in the current process group are signalled. 
.... 

It seems that this command works in Busybox as well. However, if we use this
in a script that is run from 'crond', crond itself is killed as well. That
is obviously not as expected, and indeed different from the behaviour of a
system without Busybox.

I found this behaviour with version 1.4.1, but it was easily reproducible
with version 1.10.2 from the Debian archives. 

Is this the expected behaviour? If so, what command can we issue to kill all
child processes? 


Regards, 

Jeroen van der Vegt
System designer
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