Re: screen, try #1

[Joe Allen <jhallen at datapower dot com>]

Andrew Schulman wrote:

> * Video colors become confused sometimes, especially when creating new windows 
> within screen.  For example, twice my whole console window has changed to 
> reverse video, both outside of screen and in all of the windows within 
> screen.  In the properties of the parent console window, the colors were 
> swapped, but changing them back didn't fix the problem; I finally had to 
> close the whole console.  Another time the text color changed to cyan, which 
> happens to be my prompt color.
>  
I had a similar problem with JOE: If you are in inverse video, and then 
call fork(), Cygwin changes the default
attributes to inverse (so even if you call ESC [ 0 m, it is stuck in 
inverse).  Resetting attributes before fork() fixes it
(you have to make sure screen's attribute tracking variable indicates 
this as well as sending ESC [ 0 m).

> * Detached sessions are still tied to their parent consoles.  If I detach a 
> session and then exit the parent shell, the shell doesn't exit and the zombie 
> console window stays around.  If I force the console window to close, screen 
> terminates.
>  
There's something broken with process groups in cygwin.  I had this same 
problem in JOE, but I don't clearly remember
what I had to do to fix it: make sure both setsid() and setpgrp() are 
being called.  I think it had more to do with the order
of opening the pty or tty vs. fork().  Fork first, then open the tty: 
look at mpxmk() in tty.c in JOE for something that works.

There were other weird problems: like try to suspend a sub-process and 
the parent would get suspended.

> There are two different patch sets that people have used to get screen 
> working: Christopher's 
> (http://cygwin.com/ml/cygwin-apps/2005-04/msg00163.html), and the older patch 
> set that Lapo found (http://www.j10n.org/files/screen-4.0.2-cygwin.patch).  I 
> used Christopher's patches to get these results.  I also tried the older one, 
> which is much larger and includes Christopher's.  I found the same 
> reattachment problems, but haven't had time to test the other problems yet.
>
> I'll continue to work on these problems.  Meanwhile I'd welcome any help that 
> others can offer.
>
> Should this version be uploaded so people can test it?  I've labeled it 'test' 
> in setup.hint.
>
> Andrew.
>
>