Segmentation Fault Question

[Mel Harbour <mrh30 cam ac uk>]

Appologies if this isn't the right place to post this!

A program I'm writing, using GTK, is failing to run correctly.  In short 
it throws out a segmentation fault the first time I call something gtk 
related other than gtk_init.

My code is at http://www.srcf.ucam.org/~mrh30/sandbox.c
with header file sandbox.h from the same address.

The fault originates somewhere in the function permittedsyscall.  If I 
comment out the line 'display();' in the above function, the program 
runs as expected and will output a list of all the files opened by the 
program run through the sandbox.

If you get rid of the code to extract those filenames and put the 
display() line back in, it also runs (apparently) correctly, putting a 
window up on screen.

If I have both however, I get segmentation faults, which I would have 
thought was quite odd since neither part has any dealings with the other 
part.

Mel