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