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Re: 1.5.24: data corruption problem with popen and gzip on a text mounted filesystem
- From: Eric Blake <ebb9 at byu dot net>
- To: cygwin at cygwin dot com
- Date: Mon, 23 Jul 2007 19:56:48 +0000 (UTC)
- Subject: Re: 1.5.24: data corruption problem with popen and gzip on a text mounted filesystem
- References: <46A4BC14.1050603@merl.com> <46A4ED4A.9060303@merl.com>
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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