1.3.20: mmap with nonzero file offset results in seg fault (Win2k )"

[brett.matson@csiro.au]

Accessing the mapped region of memory after an mmap call 
with a non-zero offset results in a seg fault. A zero 
offset will not result in a seg fault.

Cygwin1.dll version 1.3.19 doesn't experience this problem.  
Cygcheck output is attached.

Example:

if (rslt = mmap(0, size, prot, MAP_SHARED,  fd, offset)) 
    == MAP_FAILED) {
} else {
    printf("%d", rslt[0]); // seg fault
}
AND
if (rslt = mmap(0, size, prot, MAP_SHARED,  fd, 0)) 
    == MAP_FAILED) {
} else {
    printf("%d", rslt[0]); // no seg fault (zero offset)
}

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