To: cygwin@cygwin.com
From: Andrew Schulman <schulman.andrew@epamail.epa.gov>
Subject: Re: GNU screen on Cygwin: Cannot seem to reattach, no matter what I try
Date: Tue, 10 May 2011 15:07:03 -0400
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References: <kj0es69j72s340jpv55mn4fd8kvfpigtjd@4ax.com> <4DC987B8.4010709@dougmorse.org>
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> 1. Output of 'cygcheck -svr' appended to the end of this message.

Thanks, looks okay.

> 2. I have the problem whether I run GNU screen from a cmd.exe prompt or 
> under rxvt.  I tried Peter Li's suggestion of trying to run screen under 
> mintty -- still no joy.  It does not matter if I running GNU screen from 
> the console or if I'm logged in remotely, or if I try to detach and 
> re-attach from the same tty or different ones.  All efforts yield the 
> same result: GNU screen cannot find anything to which to re-attach, even 
> a session that I detached on the same tty just seconds before.
> 
> 3. chmod 666 on the socket file did not work (its permissions were 
> already 644, owned my 'morse', as shown in my original session long).

No, I suggested that you try 0600, on the theory that your 0640 permissions
might be too permissive, and screen would refuse to use the socket.
Unlikely, but worth a try.

However, if your socket is on a FAT file system, I don't know if you can
set 0600 permissions.

> HOWEVER, I am wondering: my Cygin /tmp *IS* on a FAT32 filesystem, *NOT* 
> an NTFS filesystem.  Would that matter?  Are socket files properly 
> handled by Cygwin on FAT32?  (I've never used a socket-based Cygwin 
> program on this host before, at least not to my knowledge.)

Hm, that could explain it.  I don't recall this coming up before.

Looking at screen(1), it says that sockets can go in "any mode 0700
directory", and that you can set that in $SCREENDIR.  So, I suggest trying
the following in order:

(1) Run

chmod 0700 /tmp/uscreens/S-morse
chmod 0600 /tmp/uscreens/S-morse/*

then try to reattach.

(2) If you can't set the above permissions because /tmp is on a FAT file
system, then find an NTFS directory and run

export SCREENDIR=/path/to/ntfs/directory

then start a new screen session, and see if you can reattach to it.


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