File: test1.sub

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# some systems, like old SunOS, have stat on /dev/fd/N and fstat(N, ...)
# return different results
: ${TMPDIR:=/tmp}

trap 'rm -f ${TMPDIR}/pipe' 0 1 2 3 6 15

exec 6>&-
echo "t -p /dev/fd/6"
test -p /dev/fd/6
echo $?

rm -f ${TMPDIR}/pipe 2>/dev/null
mkfifo ${TMPDIR}/pipe
cat < ${TMPDIR}/pipe &
exec 6>&-
exec 6>${TMPDIR}/pipe
echo "t -p /dev/fd/6"
test -p /dev/fd/6
echo $?
exec 2>/dev/null	# disable process termination message
kill $! 2>/dev/null