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# Initscripts/Writing rc.d scripts

From ArchWiki

Summary
Writing rc.d daemon scripts.
Related
Arch Boot Process
Daemon
rc.conf

Warning: Arch only supports systemd. Arch's old initscripts package is obsolete and is no longer supported. All Arch users need to move to systemd.

Initscripts uses rc.d scripts to used to control the starting, stopping and restarting of daemons.

## Guideline

- Source `/etc/rc.conf`, `/etc/rc.d/functions`, and optionally `/etc/conf.d/DAEMON_NAME`.
- Arguments and other daemon options should be placed in `/etc/conf.d/DAEMON_NAME`. This is done to separate configuration from logic and to keep a consistent style among daemon scripts.
- Use functions in `/etc/rc.d/functions` instead of duplicating their functionality.
- Include at least start, stop and restart as arguments to the script.

## Available functions

- There are some functions provided by `/etc/rc.d/functions`:
  - `stat_busy "message"`: set status busy for printed message (e.g. Starting daemon [BUSY])
  - `stat_done`: set status done (e.g. Starting daemon [DONE])
  - `stat_fail`: set status failed (e.g. Starting daemon [FAILED])
  - `get_pid program`: get PID of the program
  - `ck_pidfile PID-file program`: check whether PID-file is still valid for the program (e.g. ck_pidfile /var/run/daemon.pid daemon || rm -f /var/run/daemon.pid)
  - `[add|rm]_daemon program`: add/remove program to running daemons (stored in `/run/daemons/`)

Full list of functions is much longer and most possibilities (like way to control whether or not non-root users can launch daemon) are still undocumented and can be learned only from `/etc/rc.d/functions` source. See also `man rc.d`.

## Example

The following is an example for crond. Look in `/etc/rc.d` for greater variety.

The configuration file:

    /etc/conf.d/crond

    ARGS="-S -l info"

The actual script:

    /etc/rc.d/crond

    #!/bin/bash

    . /etc/rc.conf
    . /etc/rc.d/functions

    DAEMON=crond
    ARGS=

    [ -r /etc/conf.d/$DAEMON ] && . /etc/conf.d/$DAEMON

    PID=$(get_pid $DAEMON)

    case "$1" in
     start)
       stat_busy "Starting $DAEMON"
       [ -z "$PID" ] && $DAEMON $ARGS &>/dev/null
       if [ $? = 0 ]; then
         add_daemon $DAEMON
         stat_done
       else
         stat_fail
         exit 1
       fi
       ;;
     stop)
       stat_busy "Stopping $DAEMON"
       [ -n "$PID" ] && kill $PID &>/dev/null
       if [ $? = 0 ]; then
         rm_daemon $DAEMON
         stat_done
       else
         stat_fail
         exit 1
       fi
       ;;
     restart)
       $0 stop
       sleep 1
       $0 start
       ;;
     *)
       echo "usage: $0 {start|stop|restart}"
    esac

Retrieved from "https://wiki.archlinux.org/index.php?title=Initscripts/Writing_rc.d_scripts&oldid=263174"
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