| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # I think this is a zsh feature ported to bash.
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| 4 | #
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| 5 | # zsh gives /proc/self/fd/12, while bash gives /dev/fd/63
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| 6 | #
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| 7 | # Usage:
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| 8 | # demo/process-sub.sh <function name>
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| 9 |
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| 10 | set -o nounset
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| 11 | set -o pipefail
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| 12 | set -o errexit
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| 13 |
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| 14 | stdout() {
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| 15 | cat <(seq 2) <(seq 3)
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| 16 |
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| 17 | echo ---
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| 18 | # Is it possible to pick up this failure?
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| 19 | # Nope it gets lost
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| 20 | cat <(seq 2) <(seq ZZ)
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| 21 |
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| 22 | echo ---
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| 23 | echo pipestatus=${PIPESTATUS[@]}
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| 24 | }
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| 25 |
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| 26 | stdin() {
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| 27 | # this one hangs a little in bash
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| 28 | seq 3 > >(tac)
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| 29 | }
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| 30 |
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| 31 | stdin-shell() {
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| 32 | # key difference: the SHELL ITSELF is writing to the pipe, not a forked
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| 33 | # process like 'seq'
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| 34 |
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| 35 | echo $'1\n2\n3\n' > >(tac)
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| 36 | }
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| 37 |
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| 38 | stdin-shell-2() {
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| 39 | #{ echo 4; echo 5; echo 6; } > >(tac)
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| 40 |
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| 41 | echo "pid = $$"
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| 42 |
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| 43 | echo '__ ONE ___'
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| 44 | echo 99 > >(tac)
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| 45 |
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| 46 | # This used to hang!
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| 47 | echo '__ ONE ___'
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| 48 | { echo 99; } > >(tac)
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| 49 |
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| 50 | echo '__ TWO ___'
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| 51 | { echo 4; echo 5; } > >(tac)
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| 52 | }
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| 53 |
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| 54 | both() {
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| 55 | diff -u <(seq 2) <(seq 3) > >(tac) || true
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| 56 |
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| 57 | if test -n "${OIL_VERSION:-}"; then
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| 58 | echo status=${_process_sub_status[@]}
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| 59 | fi
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| 60 |
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| 61 | diff -u <(seq 2; exit 2) <(seq 3; exit 3) > >(tac; exit 5) || true
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| 62 |
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| 63 | if test -n "${OIL_VERSION:-}"; then
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| 64 | echo status=${_process_sub_status[@]}
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| 65 | fi
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| 66 | }
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| 67 |
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| 68 |
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| 69 | "$@"
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