screen -- won't start on remotely displayed rxvt

["Karsten M. Self" <kmself@ix.netcom.com>]

I'm running remote X display (essentially an X terminal) in which the X
server is on a local system and clients are run remotely from another
system on my LAN.  This is via tcp X connections, not an SSH tunnel.

I'm finding that I cannot run 'screen' in this configuration.  However:

  - Locally launched terminals will support 'screen'.

  - SSHing to the remote box and running screen from within the ssh session
    works.

  - I can run 'screen' natively on the remote box to its own local display.

  - I can run 'screen -r' on the remote system to reconnect to an
    existing screen session.
    
  - One workaround:  I can launch screen in daemon mode, then connect to
    the session:

        $ screen -dmS foo
        $ screen -r


I'm wondering if anyone else is seeing this and/or has suggestions for
fix.



A few odd observations, possibly explained by lib differences (see end
of email):

  - While I can run 'strace' on the remote system, 'strace screen' run
    locally fails with the following output:

     [karsten@navel:karsten]$ strace screen 2>&1 
     execve("/usr/bin/screen", ["screen"], [/* 33 vars */]) = 0
     strace: exec: Operation not permitted

    When I ssh to the remote system and run 'strace screen' it succeeds.
    SSHing out then back into local doesn't allow 'strace screen'.

  - Both locally and on the remote system, screen is sgid utmp, with
    permissions as follows (local and remote in order):

    -rwxr-sr-x  1 root  utmp  267544 2003-03-25 04:31 /usr/bin/screen
    -rwxr-sr-x  1 root  utmp  267544 2003-03-25 04:31 /usr/bin/screen

  - When attempting to run screen remotely under strace, I get the
    following output indicating mode for /var/run/screen should
    be 777, however running locally, I get a message mode should be 775:

      [karsten@superego:karsten]$ strace screen 2>/dev/null
      Directory '/var/run/screen' must have mode 777.

  - tty on both systems:

    - local:  
      crw--w----   1 karsten  tty    136,   8 2003-09-13 20:20 /dev/pts/8

    - remote:
      crw--w----   1 karsten  tty    136,  46 2003-09-13 20:22 /dev/pts/46
    

  - md5sum on both systems of 'screen' binary and linked libs, stars
    indicate differences:

    - local
      8b34bdd18ba03c2da4d120cd90c003b7  /usr/bin/screen
      e573aa743f72e40e0e6c1b8b5b5a4d1a  /lib/libncurses.so.5
    * 13813a6863211e3cfecc07e1900eb47a  /lib/libutil.so.1
    * 355a83c6702a191a6f7f09159f416039  /lib/libcrypt.so.1
      129d33d78be47f2190228401f2b42aac  /lib/libpam.so.0
    * da26d443a352c43d5b9590b119026f2a  /lib/libc.so.6
    * dd5bd1196ec190a8c300f3171097ddd4  /lib/libdl.so.2

    - remote
      8b34bdd18ba03c2da4d120cd90c003b7  /usr/bin/screen
    * e573aa743f72e40e0e6c1b8b5b5a4d1a  /lib/libncurses.so.5
    * f53e02d98bd49f7a2d0c544ada5180aa  /lib/libutil.so.1
      32d2d72354cd4680a44e4dccbc2f1cec  /lib/libcrypt.so.1
      129d33d78be47f2190228401f2b42aac  /lib/libpam.so.0
    * cfb5940df50bbef4b94cb75acafa7a26  /lib/libc.so.6
    * 5033a4ac03821573ae89ba2b1331c05a  /lib/libdl.so.2

   I'll try updating local and seeing if this changes things.  IIRC I'm
   running a few unstable pins on the remote system, but not local.

   Package versions:

   - local:
    Desired=Unknown/Install/Remove/Purge/Hold
    | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
    |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
    ||/ Name           Version        Description
    +++-==============-==============-======================================
    ii  libncurses5    5.3.20030719-1 Shared libraries for terminal handling
    ii  libc6          2.3.1-16       GNU C Library: Shared libraries and Timezone
    ii  libpam0g       0.76-13        Pluggable Authentication Modules library


   - remote:

   Desired=Unknown/Install/Remove/Purge/Hold
   | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
   |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
   ||/ Name           Version        Description
   +++-==============-==============-=======================================
   ii  libncurses5    5.3.20030719-1 Shared libraries for terminal handling
   ii  libc6          2.3.2-6        GNU C Library: Shared libraries and Timezone
   ii  libpam0g       0.76-13        Pluggable Authentication Modules library



Peace.

-- 
Karsten M. Self <kmself@ix.netcom.com>        http://kmself.home.netcom.com/
 What Part of "Gestalt" don't you understand?
   Keep software free.         Oppose the CBDTPA.         Kill S.2048 dead.
     http://www.eff.org/alerts/20020322_eff_cbdtpa_alert.html

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