1 | #!/usr/bin/env bash
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2 | #
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3 | # Test the child process FD state of each shell.
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4 | #
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5 | # This used to be a spec test, but I found it wasn't consistent when running in
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6 | # parallel under test/spec-runner.sh.
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7 | #
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8 | # Also see demo/fd-main.sh.
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9 | #
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10 | # Usage:
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11 | # ./fd-state.sh <function name>
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12 |
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13 | set -o nounset
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14 | set -o pipefail
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15 | set -o errexit
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16 |
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17 | readonly SCRIPT=_tmp/list-fds.sh
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18 |
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19 | #### File Descriptor State is clean when running script
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20 | count-fds() {
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21 | local sh=$1
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22 |
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23 | # Run it and count output
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24 | $sh $SCRIPT _tmp/fd.txt
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25 | count=$(cat _tmp/fd.txt | wc -l)
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26 | echo "count=$count"
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27 |
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28 | # bash and dash are very orderly: there are 3 pipes and then 10 or 255
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29 | # has the script.sh.
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30 | # mksh and zsh have /dev/tty saved as well. Not sure why.
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31 |
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32 | # for debugging failures
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33 | if test "$count" -ne 4; then
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34 | cat _tmp/fd.txt >&2
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35 | fi
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36 | # stdout: count=4
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37 | # OK mksh/zsh stdout: count=5
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38 | # stdout-json: ""
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39 | }
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40 |
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41 | main() {
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42 | # tail -n + 2: get rid of first line
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43 | cat >$SCRIPT <<'EOF'
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44 | out=$1
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45 | ls -l /proc/$$/fd | tail -n +2 > $out
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46 | EOF
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47 |
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48 | # TODO: Make assertions here for OSH.
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49 | for sh in bash dash mksh zsh bin/osh _bin/osh; do
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50 |
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51 | echo
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52 | echo "=== $sh ==="
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53 | echo
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54 |
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55 | if ! which $sh; then
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56 | continue
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57 | fi
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58 | count-fds $sh
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59 | done
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60 | }
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61 |
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62 | main "$@"
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