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MODULE(9)		 BSD Kernel Developer's Manual		     MODULE(9)

NAME
     module — structure describing a kernel module

DESCRIPTION
     Each module in the kernel is described by a module_t structure.  The
     structure contains the name of the device, a unique ID number, a pointer
     to an event handler function and to an argument, which is given to the
     event handler, as well as some kernel internal data.

     The DECLARE_MODULE(9) macro registers the module with the system.	When
     the module is loaded, the event handler function is called with the what
     argument set to MOD_LOAD.	On unload, what is set to MOD_UNLOAD.  When
     the system is shutting down, what contains the value of MOD_SHUTDOWN.

EXAMPLES
     #include <sys/param.h>
     #include <sys/kernel.h>
     #include <sys/module.h>

     static int foo_handler(module_t mod, int /*modeventtype_t*/ what,
			    void *arg);

     static moduledata_t mod_data= {
	     "foo",
	     foo_handler,
	     0
     };

     MODULE_VERSION(foo, 1);
     MODULE_DEPEND(foo, bar, 1, 3, 4);

     DECLARE_MODULE(foo, mod_data, SI_SUB_EXEC, SI_ORDER_ANY);

SEE ALSO
     DECLARE_MODULE(9), DEV_MODULE(9), DRIVER_MODULE(9), MODULE_DEPEND(9),
     MODULE_VERSION(9), SYSCALL_MODULE(9)

     /usr/share/examples/kld

AUTHORS
     This man page was written by Alexander Langer ⟨alex@FreeBSD.org⟩.

BSD				 March 1, 2001				   BSD

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