| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Test how many calls to execve() there are.
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| 4 | # This is also a good demo of extraneous stat() calls at startup! bash has a
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| 5 | # bunch.
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| 6 | #
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| 7 | # Usage:
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| 8 | # ./path-cache.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 | sh-demo() {
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| 15 | local sh=$1
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| 16 | local syscalls='execve,stat,lstat,access'
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| 17 | #local syscalls='execve'
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| 18 | strace -ff -e $syscalls -- $sh -c 'whoami; whoami'
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| 19 | }
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| 20 |
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| 21 | main() {
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| 22 | for sh in dash bash bin/osh; do
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| 23 | echo $'\t---'
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| 24 | echo $'\t'$sh
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| 25 | echo $'\t---'
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| 26 |
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| 27 | sh-demo $sh
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| 28 | done
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| 29 | }
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| 30 |
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| 31 | "$@"
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