47 lines
1.4 KiB
Bash
Executable file
47 lines
1.4 KiB
Bash
Executable file
#!/bin/bash -euxm
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# dumb-init should proxy all possible signals to the child process.
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dumb_init="$1"
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# Try sending all signals via dumb-init to our `print-signals` script, ensure
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# they were all received.
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. ./lib/testlib.sh
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# The easiest way to communicate with the background process is with a FIFO.
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# (piping spawns additional subshells and makes it hard to get the right PID)
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fifo=$(mktemp -u)
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mkfifo -m 600 "$fifo"
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read_cmd="timeout 1 head -n1 $fifo"
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$dumb_init ./lib/print-signals "$fifo" &
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pid="$!"
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# Wait for `print-signals` to indicate it's ready.
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$read_cmd > /dev/null
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for expected in $(catchable_signals); do
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kill -s "$expected" "$pid"
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echo -n "Sent signal ${expected}... "
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received=$($read_cmd) || {
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echo
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echo "Error: Didn't receive signal within 1 second."
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exit 1
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}
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echo "received signal ${received}."
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if [ "$expected" -ne "$received" ]; then
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echo "Error: Received signal $received, but expected signal $expected."
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exit 1
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fi
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done
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# Turn off job monitoring so we don't get a spurious "[1] + Killed" printed
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set +m
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# $pid is the PID of the dumb-init process. Since print-signals ignores all
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# signals, we need to `kill -9` it. If we just `kill -9` the dumb-init process,
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# `print-signals` will still be running. So we instead kill children of the
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# dumb-init process.
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pkill -9 -P "$pid"
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rm "$fifo"
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