Re: [PATCH 0/4] Cross compiling sharutils

[Eric Blake]

On 05/21/2015 10:50 PM, Filipe Brandenburger wrote:
> TL;DR: cygwin doesn't seem to need popen("rb") though mingw definitely does.
> 
> Even though cygwin does differentiate "r" and "rb", it my tests it
> seemed to be using binary by default. Not sure if that's a cygwin
> environment setting or if it was detecting that gzip output "looked"
> binary and was using binary that way...

Actually, https://cygwin.com/cygwin-ug-net/using-cygwinenv.html
documents that CYGWIN=nopipe_byte defined in your environment will force
cygwin to default to handling pipe contents in text mode (the default is
pipe_byte, which handles pipe contents in binary mode).  Using
popen("rt") forces text mode; popen("rb") forces binary mode, and
popen("r") uses the settings of $CYGWIN to decide which mode to use
(usually binary, as the default of pipe_byte was set for a reason).

If you MUST test text mode pipes on cygwin, then you'll have to
experiment with changing $CYGWIN

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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