Segfault when accessing mmaped memory on Cygwin

[Thomas Koenig]

I wrote:

> when trying out uf a certain shared memory allocator would
> work on Cygwin, I tried out the sample program below (which
> works on Linunx, *BSD, AIX and Solaris) and got a suprising
> falure

Actually, the failure wasn't all that unexpected, given that
I had put the ftruncate into the wrong place...

It appears to work now, sorry for the noise.

Best regards

	Thomas