Paul Winkler wrote at 2007-4-6 13:30 -0400:
> ...
>If I understand this stuff correctly, the code in question on a
>filesystem that *doesn't* have the sparse file optimization would
>equate to "write N null bytes to this file as fast as possible."

Posix defines the semantics.

I have not looked it up, but a possible interpretation would also be:
write the "" byte and let all other bytes undefined.

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