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man/openrc-run.8: document _pre and _post functions

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Fixes https://github.com/openrc/openrc/issues/155.
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William Hubbs 2017-07-25 13:54:12 -05:00
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commit f48d9c33a5
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man/openrc-run.8
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@ -284,6 +284,18 @@ system.
To see how to influence dependencies in configuration files, see the
.Sx FILES
section below.
.Sh _pre AND _post FUNCTIONS
Any command defined in extra_commands, extra_started_commands or
extra_stopped_commands can have _pre and _post functions in the service
script. If the command function is called foo, the_pre and _post
functions for it should be called foo_pre and foo_post.
.Pp
These functions should be used to perform preparation before the
command is run and cleanup after the command completes. In order for
.Nm
to record the command as being run successfully, the _pre
function, command function itself and the _post function should all exit
with a zero return code.
.Sh BUILTINS
.Nm
defines some builtin functions that you can use inside your service scripts: