/* * master.c -- the master module of a master/slave pair using kmod * * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet * Copyright (C) 2001 O'Reilly & Associates * * The source code in this file can be freely used, adapted, * and redistributed in source or binary form, so long as an * acknowledgment appears in derived source files.  The citation * should list that the code comes from the book "Linux Device * Drivers" by Alessandro Rubini and Jonathan Corbet, published * by O'Reilly & Associates.   No warranty is attached; * we cannot take responsibility for errors or fitness for use. */#ifndef __KERNEL__#  define __KERNEL__#endif#ifndef MODULE#  define MODULE#endif/* * Inclusions related to version problems. They *might* go after * <linux/module.h>, unless a symbol table is exported. All in all, * better putting them first anyways. */#include <linux/config.h> /* retrieve the CONFIG_* macros */#if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS)#  define MODVERSIONS /* force it on */#endif#ifdef MODVERSIONS#  include <linux/modversions.h>#endif#include <linux/module.h>#include <linux/version.h>/* This depends on kmod.h, refuse to go on with 2.0 */#if LINUX_VERSION_CODE < 0x020200#  error "This module needs kmod, so it won't run with 2.0"#else#include <linux/sched.h>#include <linux/kernel.h> /* printk() */#include <linux/string.h>#include <linux/init.h>#ifdef HAVE_INTER_MODULE                static const char *ime_string = NULL;static void master_test_inter();#endif                                  #include <linux/kmod.h>#include "sysdep.h"int master_init_module(void){    int r[2]; /* results */        r[0]=request_module("slave");    r[1]=request_module("nonexistent");    printk(KERN_INFO "master: loading results are %i, %i\n", r[0],r[1]);#ifdef HAVE_INTER_MODULE                    master_test_inter();		#endif                                      return 0; /* success */}#ifndef HAVE_INTER_MODULE                void master_cleanup_module(void){ }#endif                                  #ifdef HAVE_INTER_MODULEvoid master_test_inter(){    void (*ime_func)();    ime_string = inter_module_get_request("ime_string", "inter");    if (ime_string)        printk(KERN_INFO "master: got ime_string '%s'\n", ime_string);    else        printk(KERN_INFO "master: inter_module_get failed");    ime_func = inter_module_get("ime_function");    if (ime_func) {	(*ime_func)("master");	inter_module_put("ime_function");    }}	void master_cleanup_module(void){    if (ime_string)        inter_module_put("ime_string");}#endifmodule_init(master_init_module);module_exit(master_cleanup_module);#endif /* no 2.0 allowed */