Re: 3.3.0: Possible regression in cygwin DLL (Win10); fixed in snapshot

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

On Nov  8 17:23, Takashi Yano wrote:
> On Sun, 7 Nov 2021 17:20:46 -0500
> Ken Brown wrote:
> > In the meantime I found the commit that changed the default from byte mode to 
> > message mode:
> > 
> > commit 31d2bedc585420092eb53895c5f5646651f13215
> > Author: Christopher Faylor <me@cgf.cx>
> > Date:   Sun Oct 23 19:01:47 2011 +0000
> > 
> >      * fhandler_tty.cc (fhandler_pty_slave::read): Use consistent way for testing
> >      ReadFile return.
> >      * pipe.cc (fhandler_pipe::create_selectable): Open the write side of the pipe
> >      in message-mode to force writing as "chunks".  Explain why.
> > 
> > [...]
> > I also found discussion on the mailing list on the same day as this commit in 
> > which cgf referred to fixing a bug (that *I* reported, coincidentally):
> > 
> >    https://cygwin.com/pipermail/cygwin/2011-October/197953.html
> > 
> > I'll try to test more thoroughly tomorrow, but a quick test seems to show that 
> > the STC I submitted in connection with that bug report now succeeds even with 
> > CYGWIN=pipe_byte.
> 
> The STC attached to that post is checking pty behaviour. Currently,
> the named pipe for pty is always configured as message type regardless
> of CYGWIN=pipe_byte.

Ok, I guess we proceed with the patch Takashi sent to -patches for 3.3.2.

For the master branch, if you like, go ahead and switch to byte mode and
sync IO.  Or we can do that on the topic/pipe branch and merge into master
at one point, that worked nicely the last time, too.


Corinna