Process expansion

[Stathy Touloumis <stathy@xxxxxxxxxx>]

I am working with an installed application and trying to override a 
built in script using a ZSH function.  Sometimes the script (foo) is 
called from other scripts by creating a sub-process call :

## sample from script calling
OUT=`foo arg1 arg2`
echo $OUT

I am looking to override this script with a function call to leverage an 
existing authentication handle.  Is this possible?  I have tried using 
named pipes and shell expansion with no luck.

## Override with function
function foo() {
 echo "args $@";

## Trying to pass back to calling process which has shared 
authentication handle
   echo $@ >($$)

   kill -INT $$

}

## This is initiated in calling process which has access to shared 
authentication handle.
sigint foo_handler()
{
 if [[ -z $HANDLE ]]
 then
   resource_connect
   HANDLE=$$
 fi

 while read ARGS
 do
   resource_call $ARGS
 done

}

trap foo_handler INT