pty issue causes 'screen' to hang when run from mintty as detached

Andrew Schulman
Mon Jun 17 16:19:00 GMT 2013

> On Mon, Jun 17, 2013 at 06:08:27AM -0400, Andrew Schulman wrote:
> >> > Do we have any idea whether the problem is with mintty or with screen?
> >> 
> >> I observed the same behaviour as the OP, but also reproduced it in
> >> rxvt and xterm, so not a mintty issue. Since it works in a console,
> >> the Cygwin pty layer has to be the main suspect, unless screen has
> >> specfic code for Cygwin consoles or ptys?
> >
> >I don't think so, but there's one big, crufty old patch that I had to use to get
> >screen to run a few years ago.
> >
> >The version of screen that we're using now in Cygwin, 4.0.3, is about 8 years
> >old.  There haven't been any official new releases since then, but development
> >has continued and there have been a lot of improvements.  I'm in the process of
> >building an updated package from the latest git, and that version appears not to
> >need any of the patches I used to have to use to get screen to compile and run
> >in Cygwin.
> >
> >So, I suggest that we wait until the new screen test release comes out, within a
> >few days, and see if that fixes the problem.
> I looked at this briefly over the weekend and saw a problem in Cygwin's
> pty handling code.  I don't know exactly what the problem is yet but there
> is something not quite right there.  Something is closing a windows handle
> and that's causing a SIGHUP to be sent to the pty owner.  That's not right.
> I'll fix this problem eventually but it will be interesting to see if a
> newer screen behaves any better.

No, I just tested it on the latest screen release, and the problem still occurs.

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