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#!/bin/sh
#
# Check that watching a process's file descriptors works as expected.
# Allow all tests to be skipped, e.g. during a release build
test "${SKIP_ALL_TESTS}" = "1" && exit 77
true "${testSubject:?not set - call this from 'make check'}"
true "${workFile1:?not set - call this from 'make check'}"
true "${workFile2:?not set - call this from 'make check'}"
true "${workFile3:?not set - call this from 'make check'}"
true "${workFile4:?not set - call this from 'make check'}"
# Skip the test if "-d" is not available.
if ! "${testSubject}" -h | grep -Fq ' -d'; then
echo "no \`--watchfd' / \`-d' option on this platform"
exit 77
fi
seq 1 100 > "${workFile1}"
seq 1 300 > "${workFile2}"
# Run a background process to perform a few reads from a file, opening a
# second file after a moment.
# We only start doing anything once the PV process below has started (the
# workFile3 check).
# NB we just export line to make shellcheck think it's used.
true > "${workFile3}"
(
while test -e "${workFile3}" && ! test -s "${workFile3}"; do sleep 0.1; done
export line
sleep 1
read -r line
exec 9<"${workFile2}"
sleep 1
read -r line
sleep 1
) <"${workFile1}" &
pid=$!
sleep 0.1
"${testSubject}" -P "${workFile3}" -d "${pid}" -f -i 0.5 >/dev/null 2>"${workFile4}"
# Skip the test if "-d" does not work.
if grep -Fq ' -d: not available' "${workFile4}"; then
echo "no \`--watchfd' / \`-d' option on this platform"
exit 77
fi
# Process the output to make it easier to handle.
# NB "ESC [ A" is "cursor up", we turn that into "-" and a newline.
tr '\r' '\n' < "${workFile4}" | sed 's/.\[A/-!/g' | tr '!' '\n' > "${workFile1}"
# We should see at least 2 file positions for fd 0.
positionsReported="$(awk '/^ *0:/ {print $2}' < "${workFile1}" | sort -n | uniq)"
differentNumbers="$(printf "%s\n" "${positionsReported}" | grep -Ec .)"
if ! test "${differentNumbers}" -gt 1; then
printf "%s\n" "Expected at least 2 different numbers to be output for fd 0"
printf "%s:\n%s\n" "Positions reported" "${positionsReported}"
printf "%s: %s\n" "Number of different values seen" "${differentNumbers}"
printf "%s\n" "Raw output:"
cat "${workFile1}"
exit 1
fi
# We should see file descriptor 9 appear.
if ! grep -Eq '^ *9:' < "${workFile1}"; then
printf "%s\n" "Expected to see information for fd 9"
printf "%s\n" "Raw output:"
cat "${workFile1}"
exit 1
fi
# We should see the last 6 characters of fd 9's filename appear.
lastChars="$(printf "%s\n" "${workFile2}" | rev | cut -b1-6 | rev)"
if ! grep -Fq "${lastChars}:" < "${workFile1}"; then
printf "%s\n" "Expected to see a filename for fd 9"
printf "%s\n" "Raw output:"
cat "${workFile1}"
exit 1
fi
exit 0
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