Hugh Secker-Walker <hugh <at> merl.com> writes:
> Interestingly, I had tried popen("gzip | dd of=outputfile", "wb") as a
> lower-level way to avoid what I guessed was a problem with gzip using
> the stdout. The dd attempt didn't work. This failure suggests to me
> that dd and gzip experience a similar problem in this popen() context,
> a problem that cat somehow avoids.
It looks like dd currently honors mount points. You would need to use:
popen("gzip | dd of=outputfile oflag=binary", "wb")
to guarantee binary writes. But I thought at one point I had patched dd to
default to binary unless you used oflag=text; I'll have to investigate.
--
Eric Blake
volunteer cygwin coreutils maintainer
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