vfork, exec and %SYSTEM-W-UNWIND

Hi,

I want to vfork and exec a child process from an XS subroutine, but I 
always got the following error:

   %SYSTEM-W-UNWIND, unwind currently in progress

The same code as an standalone program just works.

Attached is a sample module with an script "pparent.pl", that triggers 
the error.

It also contains two C files "child.c" and "parent.c". "child" has to be 
manually compiled before calling "pparent.pl".


Could somebody help me to solve this issue?


Cheers,

- Salva