timeout/timeout

#!/bin/sh

usage() {
	printf "Usage: %s [-t TIMEOUT] [-c COMMAND]\n\n" "$0"
	printf "TIMEOUT and COMMAND can be set as env vars.\n"
}

on_interrupt() {
	print "Process aborted!\n"

	exit 130
}

create_script() {
	printf "#!/bin/sh\n%s\n" "$1" > "$2"
	chmod +x "$SCRIPT_FILE"
}

run_script() {
	if [ "$2" -eq 0 ]; then
		"$SCRIPT_FILE" >/dev/null 2>&1 &
	else
		"$SCRIPT_FILE" >&2 &
	fi

	printf "%d" $!
}

stop_delete_script() {
	kill -9 "$1"
	rm -f "$2"
}

check_pid() {
	PID=$1
	LOOP=$2

	for _ in $(seq 1 "$((LOOP*2))"); do
		test -d "/proc/$PID/" && sleep 0.5 || STATUS=0
	done

	printf "%d" ${STATUS:-1}
}

main() {
	while getopts "ht:c:v" option; do
		case "${option}" in
			h) usage; exit 0;;
			t) TIMEOUT="$OPTARG";;
			c) COMMAND="$OPTARG";;
			v) VERBOSE=1;;
			*) usage; exit 1;;
		esac
	done

	TIMEOUT="${TIMEOUT:-10}"
	VERBOSE="${VERBOSE:-0}"

	if [ -z "$COMMAND" ]; then
		printf "Command is required!\n"
		exit 1
	fi

	SCRIPT_FILE="$(mktemp)"

	create_script "$COMMAND" "$SCRIPT_FILE"

	SCRIPT_PID=$(run_script "$SCRIPT_FILE" "$VERBOSE")
	EXIT_STATUS=$(check_pid "$SCRIPT_PID" "$TIMEOUT")

	stop_delete_script "$SCRIPT_PID" "$SCRIPT_FILE"

	exit "$EXIT_STATUS"
}

trap on_interrupt INT

main "$@"