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#! /usr/bin/env bash
#
# This script imitates the behavior of the Linux "perf" command. Useful
# for testing purposes because this script produces consistent and
# predictable results.
#
# NOTE: if this script is in PATH, then it should not be named "perf", because
# we want to use the real perf command for some tests.
# Only "perf stat" is supported.
if [ "$1" != "stat" ]; then
exit 1
fi
shift
# Ignore all options except "-o".
while getopts "o:x:e:" arg; do
case $arg in
o)
fname=$OPTARG
;;
*) ;;
esac
done
shift $((OPTIND - 1))
# Use a hard-coded message so that we get predictable results
msg="1000 instructions"
# Write the message to a file (if specified), or stderr
if [ -n "$fname" ]; then
echo "$msg" >"$fname"
else
echo "$msg" >&2
fi
# Run the specified command
"$@"
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