q: vgetty detecting hangup?

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 I am running vgetty on freebsd 2.2.7. I am using the pc serial ports.
vgetty: experimental test release 0.9.4 / 20Jul99. I have a zyxel 1496,
rom level 6.16. I have put together a little TCL hack to drive the
modem, I include it here:

#!/usr/local/bin/tcl

#
# This script uses TclX for thr kill command.
#

#
------------------------------------------------------------------------------

#
#
proc vapi_init { } \
{
global env VI_FILE VO_FILE

 set VI_FILE [open /dev/fd/$env(VOICE_INPUT) r]
 set VO_FILE [open /dev/fd/$env(VOICE_OUTPUT) w]

 puts [vapi_recv]
 vapi_send "HELLO VOICE PROGRAM"
 puts [vapi_recv]
}

#
------------------------------------------------------------------------------

#
#
proc vapi_send { MSG } \
{
global env VI_FILE VO_FILE

 puts $VO_FILE $MSG
 flush $VO_FILE
 kill SIGPIPE $env(VOICE_PID)
}

#
------------------------------------------------------------------------------

#
#
proc vapi_recv { } \
{
global env VI_FILE VO_FILE

 return [gets $VI_FILE]
}

#
------------------------------------------------------------------------------

#
#
 vapi_init

 vapi_send "DEVICE DIALUP_LINE"
 puts "DEVICE DIALUP_LINE : [vapi_recv]"

 vapi_send "ENABLE EVENTS"
 puts "ENABLE EVENTS : [vapi_recv]"

 while { 1 } \
 {
  vapi_send "PLAY /var/spool/voice/messages/standard.rmd"
  puts "PLAY : [vapi_recv]"
  switch [vapi_recv] \
  {
   RECEIVED_DTMF \
   {
    set DTMF [vapi_recv]
    puts "RECEIVED_DTMF : $DTMF"
    vapi_send "STOP"
    puts "STOP : [vapi_recv]"

    switch $DTMF \
    {
     1  { break }
     default { puts "key : $DTMF" }
    }
   }
   READY { }
  }
 }

 vapi_send "DISABLE EVENTS"
 puts "DISABLE EVENTS : [vapi_recv]"

 vapi_send "GOODBYE"
 puts "GOODBYE : [vapi_recv]"

I wrap it in this shell script to get it to run as the call_program:

#!/bin/bash
echo "before shell execs" > /tmp/out.txt
/usr/local/sbin/vgetty_test.tcl 2> /tmp/err.txt >> /tmp/out.txt
echo "after shell execs" >> /tmp/out.txt

 My problen is this: if I wangup inside the while{ 1 }, it keeps playing

the message forever. Is there a way to get a 'hangup' event?

--
"The solution to a problem should be as simple as possible,
no simpler."
 -Albert Einstein