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26 lines
421 B
Text
26 lines
421 B
Text
trap ': $((brokenpipe+=1))' PIPE
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P=${TMPDIR:-/tmp}
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cd $P
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T=$(mktemp -d sh-test.XXXXXX)
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cd $T
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brokenpipe=0
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mkfifo fifo1 fifo2
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read dummy >fifo2 <fifo1 &
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{
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exec 4>fifo2
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} 3<fifo2 # Formerly, sh would keep fd 3 and a duplicate of it open.
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echo dummy >fifo1
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if [ $brokenpipe -ne 0 ]; then
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rc=3
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fi
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wait
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echo dummy >&4 2>/dev/null
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if [ $brokenpipe -eq 1 ]; then
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: ${rc:=0}
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fi
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rm fifo1 fifo2
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rmdir ${P}/${T}
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exit ${rc:-3}
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