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Re: Aw: Re: Aw: Re: Setting mtime doesn't work after copying a file with mmap

Carsten Kunze <> writes:

> (Christos Zoulas) wrote:
>> How often should it be updated?
> Only once on munmap?  If it is updated at an unpredictable time it
> makes something like utime(2) senseless (since it is changed anyway).
> Always use msync is a performance issue for e.g. "cp -p ..." (so I
> think cp(1) doesn't use mmap for copying).
> If the current behaviour is 4.4BSD derived it is ok, but if it's
> "only" NetBSD specific it is maybe not optimal.

My first question is always: What does POSIX say?

Also, I wonder if there are any synchronization guarantees about *time
updates on write or close with regular file ops.

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