1.5.24: data corruption problem with popen and gzip on a text mounted filesystem
Eric Blake
ebb9@byu.net
Mon Jul 23 19:57:00 GMT 2007
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
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
More information about the Cygwin
mailing list