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[Solved] Setting mtime doesn't work after copying a file with mmap

Greg Troxel <> wrote:

> My first question is always: What does POSIX say?

POSIX says:

"The last data modification and last file status change timestamps of a file that is mapped with MAP_SHARED and PROT_WRITE shall be marked for update at some point in the interval between a write reference to the mapped region and the next call to msync() with MS_ASYNC or MS_SYNC for that portion of the file by any process."

When I do a msync with MS_ASYNC it works as expected and it should not block the process (I did not test the latter). So it was a usage issue. Sorry for the noise...


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