Managing and Developing Dynamically Loadable Kernel Modules

Developing Dynamically Loadable Kernel Modules

Chapter 12 565

extern int (*dev_init)(void);

/* Link my init function into chain */

dlclass_saved_init = dev_init;

dev_init = (int (*)()) &dlclass_linked_init;

/* Register driver with WSIO */

return ( wsio_install_driver(&dlclass_wsio_info) );

}

* Device initialization Link

* Called only for statically linked drivers to link init

* routine into list.

static void

dlclass_linked_init (void)

{

/* Perform driver-specific initialization */

(void) dlclass_init ();

/* Call next init function in chain */

(void) (*dlclass_saved_init)();

}

* Device initialization

* This is common code for both statically linked and

* dynamically loaded modules.

static int

dlclass_init (void)

{

/* This driver has no initialization code. But if it did,

* it would go here!

return 0; /* return value is ignored. */

}

* OPEN

static int

dlclass_open(dev_t dev, int flag, intptr_t dummy, int mode)

{