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All modules must have at least the following functions:
Do what you need to do when you get started. This function
returns 0 on success and non-zero on failure (it is not considered loaded
if it fails.
The module will soon be unloaded. If any channels are using your
features, you should give them a softhangup in an effort to keep the
program from crashing. Generally, unload_module is only called when the
usecount is 0 or less, but the user can force unloading at their
discretion, and thus a module should do its best to comply (although in
some cases there may be no way to avoid a crash). This function should
return 0 on success and non-zero on failure (i.e. it cannot yet be
Return a description of the module's functionality.
Return the number of channels, etc that are using you.