#!/bin/bash USAGE=" USAGE: xrsb-sched [] [] action A comma or space separated list of actions to associate with the update signal. when The integer number of milliseconds to wait before sending the update signal, or one of the following values: - m to send the update signal at the top of the next minute - h to send the update signal at the top of the next hour - d to send the update signal at the top of the next day If not present, the update signal will be sent immediately. repeat If present, the update signal will be sent repeatedly according to . EXAMPLES: If the daemon interprets the actions 'vol' and 'bl' to mean update the volume and backlight statuses, respectively, send a signal to immediately update both of those statuses. xsrb-sched 'vol,bl' If the daemon interprets the actions 'cpu' and 'mem' to mean update the cpu and memory usage statuses, respectively, send a signal to update both of those statuses every 5 seconds. xsrb-sched 'cpu,mem' 5000 1 If the daemon interprets the actions 'bat' and 'dt' to mean update the battery and date/time statuses, respectively, send a signal to update both of those statuses at the top of every minute. xsrb-sched 'bat,dt' m true " DAEMON=xrsbd ACTION_DIR=/tmp/xrsb-action/ # Convert integer milliseconds to floating point seconds ms_to_s () { printf '%.3f' "${1}e-3" } # Validate the arguments if [[ "$#" -lt 1 || "$#" -gt 3 ]]; then printf '%s' "${USAGE}" 1>&2 exit 128 fi IFS=', ' read -r -a actions <<< "$1" when="${2:-0}" repeat="$3" if [[ ! "${when}" =~ ^[0-9]+|[mhd]$ ]]; then printf 'Invalid argument : %s\n' "${when}" 1>&2 exit 128 fi # Get the daemon PID so we can send the signal to it later. Getting the PID once # here is more efficient than getting it each time in the while loop, but if the # daemon is restarted and the PID changes, all subsequent updates will fail. daemon_pid="$(pgrep --newest --exact "${DAEMON}")" if [[ -z "${daemon_pid}" ]]; then printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2 exit 1 fi # Send the signal if this is the first run or if repeat is on first_run=1 while [[ "${first_run}" -eq 1 || -n "${repeat}" ]]; do first_run=0 # Sleep until it's time to send the signal if [[ "${when}" != '0' ]]; then if [[ "${when}" =~ ^[0-9]+$ ]]; then sleep "$(ms_to_s "${when}")" else case "${when}" in m) sleep $((60 - $(date +%S))) ;; h) readarray -t ms < <(date +'%M%n%S') sleep $((3600 - ms[0] * 60 - ms[1])) ;; d) readarray -t hms < <(date +'%H%n%M%n%S') ##sleep $(((24 - hms[0]) * 3600 - hms[1] * 60 - hms[2])) printf '%d\n' $(((24 - hms[0]) * 3600 - hms[1] * 60 - hms[2])) ;; esac fi fi # Create the signal data and send the signal to the daemon if [[ "$(ps --no-headers -o '%c' -q "${daemon_pid}")" != "${DAEMON}" ]]; then printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2 exit 1 fi for action in "${actions[@]}"; do touch "${ACTION_DIR}/${action}"; done kill -SIGUSR1 "${daemon_pid}" done