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#!/bin/sh
FSTAT="/usr/bin/fstat"
GREP="/usr/bin/grep"
AWK="/usr/bin/awk"
SED="/usr/bin/sed"
CAT="/bin/cat"
HEAD="/usr/bin/head"
dispnum=0
if [ x"$1" = x"--display" ]; then
if [ $# != 2 ]; then
echo "usage: $0 [--display DISPLAY]"
exit 1
fi
DISPLAY=$2
fi
if [ ! -z "${DISPLAY}" ]; then
dispnum=$(echo ${DISPLAY} | ${SED} -E -e 's|:([0-9]+).*|\1|')
fi
if [ ! -f "/tmp/.X${dispnum}-lock" ]; then
echo "ERROR: Failed to find X lock file for display ${dispnum}"
exit 1
fi
pid=$(${CAT} "/tmp/.X${dispnum}-lock")
device=$(${FSTAT} -p ${pid} | ${GREP} ttyv | ${HEAD} -1 | ${AWK} '{print $8}')
if [ -z "${device}" ]; then
echo "ERROR: Failed to find TTY device for X server on display ${dispnum}"
exit 1
fi
echo "/dev/${device}"
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