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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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