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I was trying to run sqlite's benchmark but ran into an unsupported feature: shared file mapping.
From strace's log on the test, once the file is mapped, there is no more open/read/write to that file. Thus, we can safely ignore this flag in this case. With this change, I can run the test and get some performance numbers but I'm not 100% sure if they are correct.
Supporting shared file mapping requires significant change; not sure how to do it yet and whether we are going to support it.