"stty" under Linux doesn't recognize serial console? (Debian package ver. 2.0-7)

[Ralf G. R. Bergs]

Hi there,

I'm running a headless Debian box. I don't have a VGA card in this box, but 
I'm using a serial console instead.

I often had the problem that "shutdown" or "reboot" would hang. Upon further 
investigation I found out that the "stty" process was hanging. When I killed 
"stty" the system properly shut down/rebooted.

I attribute this hanging to the fact that "stty" doesn't properly detect it's 
running on a system with only a serial console. As a temporary fix I've 
changed /etc/init.d/rc (this is the offending location where "stty" is invoked 
upon shutdown) as follows:

  # 2001-12-01 rabe: Only execute if NOT on serial console
  grep console=ttyS /proc/cmdline >/dev/null 2>&1
  if [ $? == 1 ]; then
    # Set onlcr to avoid staircase effect.
    stty onlcr 0>&1
  fi

I recognize that this is pretty much of a hack, so I'd like to ask you to try 
to reproduce and, if possible, fix the problem. I'm running Debian 2.2 stable.

Thanks,

Ralf


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