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    SubjectRe: msync() needed before munmap() when writing to shared mapping?
    Followup to:  <>
    By author: Jamie Lokier <>
    In newsgroup:
    > > munmap() and fsync() or msync() will flush it to disk; there is no
    > > reason munmap() should unless perhaps the file was opened O_SYNC.
    > That was talking about flushing data all the way to disk. The
    > implication of hpa's response is that munmap() does propagate the
    > dirty bits from the page table to the file. That is the obvious
    > behaviour, and what I've always assumed.

    Obvious behaviour, and required by POSIX.

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