| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Usage:
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| 4 | # ./background-status.sh <function name>
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| 5 |
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| 6 | set -o nounset
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| 7 | #set -o pipefail
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| 8 | #set -o errexit # wait waill fail with this
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| 9 |
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| 10 | do_some_work() {
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| 11 | sleep 0.2
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| 12 | exit $1
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| 13 | }
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| 14 |
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| 15 | wait_pids() {
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| 16 | { sleep 0.1; exit 5; } &
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| 17 | pid1=$!
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| 18 |
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| 19 | do_some_work 6 &
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| 20 | pid2=$!
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| 21 |
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| 22 | { sleep 0.3; exit 7; } &
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| 23 | pid3=$!
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| 24 |
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| 25 | do_some_work 8 &
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| 26 | pid4=$!
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| 27 |
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| 28 | echo "Waiting for PIDs $pid1 $pid2 $pid3"
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| 29 |
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| 30 | wait $pid1; echo $?
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| 31 | wait $pid2; echo $?
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| 32 | wait $pid3; echo $?
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| 33 | wait $pid4; echo $?
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| 34 |
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| 35 | echo 'Done'
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| 36 | }
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| 37 |
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| 38 | # NOTE: dash/mksh/zsh all lack the -n option. That seems like an oversight.
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| 39 | wait_next() {
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| 40 | { sleep 0.1; exit 8; } &
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| 41 | pid1=$!
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| 42 |
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| 43 | { sleep 0.2; exit 9; } &
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| 44 | pid2=$!
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| 45 |
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| 46 | { sleep 0.3; exit 10; } &
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| 47 | pid3=$!
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| 48 |
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| 49 | wait -n; echo $?
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| 50 | wait -n; echo $?
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| 51 | wait -n; echo $?
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| 52 |
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| 53 | echo 'Done'
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| 54 | }
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| 55 |
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| 56 | both() {
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| 57 | wait_pids
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| 58 | wait_next
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| 59 | }
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| 60 |
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| 61 | # ERROR: says "no job control"
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| 62 | job_control() {
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| 63 | { sleep 0.1; exit 8; } &
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| 64 | fg
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| 65 | }
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| 66 |
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| 67 | # ERROR: says "no job control"
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| 68 | job_control2() {
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| 69 | { sleep 0.1; exit 8; } &
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| 70 | %1
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| 71 | }
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| 72 |
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| 73 | "$@"
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