INIT\-D\-SCRIPT - Online Linux Manual PageSection : 5
Source : Debian sysvinit
Updated : August 5, 2019
Operating system : Debian
NAME init−d−script —interpreter for short and simple init.d scripts
DESCRIPTIONGeneric init.d script framework to reduce the redundant code in /etc/init.d/. The goal is to create an init.d script that is Debian and LSB compliant. When the Debian policy conflicts with the LSB, the Debian policy takes precedence. This is a simple example on how init−d−script can be used to start and stop a daemon with PID file support: #!/usr/bin/env /lib/init/init−d−script
### BEGIN INIT INFO
# Provides: atd
# Required−Start: $syslog $time $remote_fs
# Required−Stop: $syslog $time $remote_fs
# Default−Start: 2 3 4 5
# Default−Stop: 0 1 6
# Short−Description: run at jobs
# Description: Debian init script to start the daemon
# running at jobs.
### END INIT INFO
DAEMON=/usr/sbin/atdThe following variables affect behaviour of an init script: DAEMON Path to daemon being started. If the init script is not supposed to start any kind of daemon, the functions do_start_override(), do_stop_override() and do_status_override() should be defined instead. DAEMON_ARGS Additional arguments, passed to daemon during start. NAME Additional environment variables are sources from /etc/default/${NAME}. If unset, this variable defaults to the basename of the ‟ DAEMON ” value. COMMAND_NAME If this variable is set, it is used as argument to the -−name option of start−stop−daemon 8. It may be useful if the value of the NAME variable is too long. PIDFILE Path to file where the process identifier of the started daemon will be stored during start. If the value is verbatim ‟ none ”, the process identifier will not be stored in any file. If this variable is not set, it gets a sensible default value, so it is rarely necessary to set this variable explicitly. Additionally, it is possible to change the behaviour of the resulting shell script by overriding some of the internal functions. To do so, define function with an _override suffix. So, for example, to override the do_status() function, one should define a do_status_override() function. The exception to this rule is the do_reload() function, whose override should be defined as-is, without the above-mentioned suffix. Here is a control flow chart that explains what functions are called and when: /etc/init.d/script start
do_start
do_start_prepare # no-op
do_start_cmd # start−stop−daemon is called here
do_start_cleanup # no-op
/etc/init.d/script stop
do_stop
do_stop_prepare # no-op
do_stop_cmd # start−stop−daemon is called here
do_stop_cleanup # no-op
/etc/init.d/script status
do_status
/etc/init.d/script reload
do_reload
do_usage
exit 3
/etc/init.d/script force−reload
do_force_reload
do_reload # if overridden
do_restart
do_restart_prepare
do_stop_cmd
do_start_cmd
do_restart_cleanup
/etc/init.d/script restart
do_force_restart
/etc/init.d/script try−restart
if do_status; then
do_restart
do_restart_prepare
do_stop_cmd # start−stop−daemon is called here
do_start_cmd # start−stop−daemon is called here
do_restart_cleanup
/etc/init.d/script <arg>
do_unknown <arg>
exit 3
/etc/init.d/script
do_usageAs can be seen, by default, the script does not support the reload action; it should be implemented by the script writer by defining a do_reload() function. If the daemon performs reload action upon receiving a SIGUSR1 signal, a generic implementation can be used with the following code: alias do_reload=do_reload_sigusr1
SEE ALSOinittab(8), service(8), update−rc.d 8.
AUTHORS -nosplit Petter Reinholdtsen ⟨pere@debian.org⟩ 0
Johanes Gumabo
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