second call to mmap() results in error

[Lavrentiev, Anton (NIH/NLM/NCBI) [C]]

> Adding the <unistd.h> fixes the problem in all its iterations

I must be missing a point here, so what was the problem with the original
test program (which BTW worked fine on my CYGWIN installation).  Seems like
<unistd.h> was not needed there?  And how adding just <unistd.h> (w/o adding
ftruncate(), IIUC) has made it work?

Thanks,

Anton Lavrentiev
Contractor NIH/NLM/NCBI