In-band SA child status monitoring

[Kris Deugau <kd...@vianet.ca>]

I started checking into ways that spamd's behaviour can be more deeply 
monitored after a report from a coworker that it *apparently* stopped 
responding.  spamd PING doesn't seem to indicate the outage for some reason.

I was hoping to find a spamd protocol command that would return the same 
child status string as is sent to the log on a regular basis, and didn't 
find one.  So I tried to add one.

However, I can't quite see how a child process can request something 
from the parent;  all of the IPC seems to be set up for one-way requests 
from the parent to the children.

Is there a map of which methods are called where/when that I can use to 
track down where I might add the needed code?  I *think* I've found 
where the child can send the request;  but I can't find anywhere the 
parent can respond to that request.  :/

-kgd