The Old New Thing

What is the effect of memory-mapped file access on GetLastError()?

February 9, 2012 Feb 9, 2012 02/9/12

Raymond Chen

A customer was using memory-mapped files and was looking for information as to whether access to the memory-mapped data modifies the value returned by . A member of the kernel team replied, "No, memory-mapped I/O does not ever change the value returned by ." That answer is simultaneously correct and wrong, a case of looking at the world ...