| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Test kernel state: which signals caught, ignored, etc.
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| 4 | #
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| 5 | # Copied from:
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| 6 | # https://unix.stackexchange.com/questions/85364/how-can-i-check-what-signals-a-process-is-listening-to
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| 7 | #
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| 8 | # Usage:
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| 9 | # test/signal-state.sh <function name>
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| 10 |
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| 11 | sigparse() {
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| 12 | # Parse signal format in /proc.
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| 13 | local hex_mask=$1
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| 14 |
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| 15 | local i=0
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| 16 |
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| 17 | # bits="$(printf "16i 2o %X p" "0x$1" | dc)" # variant for busybox
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| 18 |
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| 19 | # hex to binary. Could also do this with Python.
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| 20 | bits="$(printf 'ibase=16; obase=2; %X\n' "0x$hex_mask" | bc)"
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| 21 | while test -n "$bits"; do
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| 22 | i=$((i + 1))
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| 23 | case "$bits" in
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| 24 | *1)
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| 25 | local sig_name=$(kill -l "$i")
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| 26 | printf ' %s(%s)' "$sig_name" "$i"
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| 27 | ;;
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| 28 | esac
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| 29 | bits="${bits%?}"
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| 30 | done
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| 31 | }
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| 32 |
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| 33 | report() {
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| 34 | grep '^Sig...:' "/proc/$1/status" | while read state hex_mask; do
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| 35 | printf "%s%s\n" "$state" "$(sigparse "$hex_mask")"
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| 36 | done
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| 37 | }
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| 38 |
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| 39 | do-child() {
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| 40 | echo
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| 41 | echo 'BACKGROUND CHILD'
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| 42 | $sh -c 'script=$1; sleep 0.5 & { sleep 0.2; $script report $!; }' -- $0
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| 43 |
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| 44 | # TODO: I think we need a foreground child too. It can just be a C program that
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| 45 | # prints its own PID, and then waits for a byte on stdin before it exits?
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| 46 | }
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| 47 |
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| 48 | compare-shells() {
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| 49 | local do_child=${1:-}
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| 50 |
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| 51 | local -a shells=(bash dash mksh zsh bin/osh)
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| 52 |
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| 53 | # Hm non-interactive shells have consistency.
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| 54 | # SIGCHLD and SIGINT are caught in bash, dash, zsh, mksh. mksh catches
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| 55 | # several more.
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| 56 |
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| 57 | for sh in ${shells[@]}; do
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| 58 | echo
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| 59 | echo "---- $sh ----"
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| 60 | echo
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| 61 |
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| 62 | $sh -c 'script=$1; $script report $$' -- $0
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| 63 |
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| 64 | if test -n "$do_child"; then
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| 65 | do-child $sh
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| 66 | fi
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| 67 | done
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| 68 |
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| 69 | echo
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| 70 | echo
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| 71 |
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| 72 | for sh in ${shells[@]}; do
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| 73 | echo
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| 74 | echo "---- $sh -i ----"
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| 75 | echo
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| 76 |
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| 77 | # NOTE: If we don't set --rcfile, somehow this parent shell gets
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| 78 | # [2]+ Stopped devtools/sigparse.sh compare-shells
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| 79 | # Seems related to spec test flakiness.
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| 80 |
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| 81 | local more_flags=''
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| 82 | case $sh in
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| 83 | (bash|bin/osh)
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| 84 | more_flags='--rcfile /dev/null'
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| 85 | ;;
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| 86 | esac
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| 87 |
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| 88 | $sh $more_flags -i -c 'script=$1; $script report $$' -- $0
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| 89 |
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| 90 | if test -n "$do_child"; then
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| 91 | do-child $sh
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| 92 | fi
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| 93 | done
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| 94 | }
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| 95 |
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| 96 | "$@"
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