Managing and Developing Dynamically Loadable Kernel Modules

Developing Dynamically Loadable Kernel Modules

Chapter 12 561

Sample Component Files

dlclass.c

* Loadable/Unloadable Test Driver - dlclass

#include <sys/types.h>

#include <sys/param.h>

#include <sys/errno.h>

#include <sys/malloc.h>

#include <sys/mod_conf.h>

#include <sys/moddefs.h>

#include <sys/io.h>

#include <sys/wsio.h>

/* Entry Points */

int dlclass_install(void);

static int dlclass_load(void *drv_infop);

static int dlclass_unload(void *drv_infop);

static int dlclass_open(dev_t dev, int flags, intptr_t dummy,

int mode);

static int dlclass_close(dev_t dev, int flags, int mode);

static int dlclass_read(dev_t dev, struct uio *uio);

static int dlclass_write(dev_t dev, struct uio *uio);

/* Local functions */

static int dlclass_init (void);

static void dlclass_linked_init (void);

/* Tunable Parameters */

extern int dlclass_no_unload;

extern int dlclass_debug;

extern int dlclass_bufsz;

/* message for dlclass_read() */

static char dlclass_msg[] = "Reading from loadable WSIO driver

’dlclass’.\n";

* Wrapper Table

extern struct mod_operations gio_mod_ops;

static drv_info_t dlclass_drv_info;

extern struct mod_conf_data dlclass_conf_data;