[Chicken-users] Interaction of subprocess and condition handling

[Lassi Kortela]

How do you handle errors signaled by the 'process' procedure from the 
(chicken process) module in Chicken 5?

When I try things like

  (receive (from-child to-child child)
      (condition-case
          (process command args)
        (_ ()
           (values #f #f #f)))
    ...)

I get weird results - I have some 'display' calls, and according to 
'current-process-id' some of them are coming from a different PID (I 
assume 'process' does fork/exec internally, so somehow some of the 
display code actually ends up running in the forked child process.

I guess normally the unix execve() call succeeds so the child process 
stops running the Chicken programs and executes the desired command. But 
when execve() fails (e.g. due to a missing executable file) then the 
child process continues running Chicken code instead of exiting?