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Because OpenWrt uses its own init script system, all init scripts must be installed |
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as \texttt{/etc/init.d/\textit{name}} use \texttt{/etc/rc.common} as a wrapper. |
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Example: \texttt{/etc/init.d/httpd} |
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\begin{Verbatim} |
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#!/bin/sh /etc/rc.common |
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# Copyright (C) 2006 OpenWrt.org |
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START=50 |
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start() { |
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[ -d /www ] && httpd -p 80 -h /www -r OpenWrt |
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} |
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stop() { |
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killall httpd |
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} |
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\end{Verbatim} |
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as you can see, the script does not actually parse the command line arguments itself. |
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This is done by the wrapper script \texttt{/etc/rc.common}. |
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\texttt{start()} and \texttt{stop()} are the basic functions, which almost any init |
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script should provide. \texttt{start()} is called when the user runs \texttt{/etc/init.d/httpd start} |
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or (if the script is enabled and does not override this behavior) at system boot time. |
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Enabling and disabling init scripts is done by running \texttt{/etc/init.d/\textit{name} start} |
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or \texttt{/etc/init.d/\textit{name} stop}. This creates or removes symbolic links to the |
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init script in \texttt{/etc/rc.d}, which is processed by \texttt{/etc/init.d/rcS} at boot time. |
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The order in which these scripts are run is defined in the variable \texttt{START} in the init |
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script, which is optional and defaults to \texttt{50}. Changing it requires running |
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\texttt{/etc/init.d/\textit{name} enable} again. |
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You can also override these standard init script functions: |
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\begin{itemize} |
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\item \texttt{boot()} \\ |
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Commands to be run at boot time. Defaults to \texttt{start()} |
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\item \texttt{restart()} \\ |
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Restart your service. Defaults to \texttt{stop(); start()} |
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\item \texttt{reload()} \\ |
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Reload the configuration files for your service. Defaults to \texttt{restart()} |
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\end{itemize} |
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You can also add custom commands by creating the appropriate functions and referencing them |
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in the \texttt{EXTRA\_COMMANDS} variable. Helptext is added in \texttt{EXTRA\_HELP}. |
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Example: |
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\begin{Verbatim} |
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status() { |
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# print the status info |
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} |
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EXTRA_COMMANDS="status" |
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EXTRA_HELP=" status Print the status of the service" |
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\end{Verbatim} |
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