[Asterisk-Dev] Module unloading

[Michael Sandee]

When writing a module which does some magic on unload_module() I ran 
into some trouble...

In contrary to what include/asterisk/module.h says, unload_module() does 
not get called during exit, only when unload is called from the CLI.

//! Cleanup all module structures, sockets, etc
/*!
 * This is called at exit.  Any registrations and memory allocations need
 * to be unregistered and free'd here.  Nothing else will do these for 
you (until exit).
 * Return 0 on success, or other than 0 if there is a problem.
 */
int unload_module(void);

Asterisk needs you to specifically register an exit function to be 
called in the quit_handler().

static void mymodule_atexit(void)
{
    // do magic stuff
}

at the end of load_module:
ast_register_atexit(mymodule_atexit);

at the beginning of unload_module:
ast_unregister_atexit(mymodule_atexit);

Comments on this are welcome.

Some other application developers ran into this problem so I suggest the 
comments in module.h are being changed... Some applications depend on it.

Michael