简单驱动出错

Allan.Yu

把这几个改成正确的定义
static ssize_t hello_read();
static ssize_t hello_write();
static int hello_open();
static int hello_release();

nuclearweapon

Post by haohao_h
这个是c99语法，据说具有更好的兼容性，我试了，还是不行！很奇怪，我把struct file_operations hello_fops={
read: hello_read,};
改成struct file_operations *hello_fops=NULL;就不出错了，在/usr/include目录下的fs.h文件没有file_operations结构的定义，说明我的include目录应该是正确的吧！file_operations结构我看不出有什么问题

1. 
   
2. /*
   
3. * NOTE:
   
4. * read, write, poll, fsync, readv, writev can be called
   
5. *   without the big kernel lock held in all filesystems.
   
6. */
   
7. struct file_operations {
   
8.         struct module *owner;
   
9.         loff_t (*llseek) (struct file *, loff_t, int);
   
10.         ssize_t (*read) (struct file *, char *, size_t, loff_t *);
    
11.         ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
    
12.         int (*readdir) (struct file *, void *, filldir_t);
    
13.         unsigned int (*poll) (struct file *, struct poll_table_struct *);
    
14.         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
    
15.         int (*mmap) (struct file *, struct vm_area_struct *);
    
16.         int (*open) (struct inode *, struct file *);
    
17.         int (*flush) (struct file *);
    
18.         int (*release) (struct inode *, struct file *);
    
19.         int (*fsync) (struct file *, struct dentry *, int datasync);
    
20.         int (*fasync) (int, struct file *, int);
    
21.         int (*lock) (struct file *, int, struct file_lock *);
    
22.         ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
    
23.         ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
    
24.         ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
    
25.         unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
    
26. };
    

复制代码

晕你仔细看看我是怎么写的！
我可不是你那样写的！

haohao_h

这个是fh.h里struct file_operations的定义！

Allan.Yu

#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif

#define __NO_VERSION__

#include <linux/config.h>
#include <linux/module.h>

MODULE_LICENSE("GPL");
#ifdef CONFIG_SMP
#define __SMP__
#endif

#include <linux/kernel.h> /* printk()*/
#include <linux/fs.h>/*file_operations*/
#include <linux/init.h>/*moudle_init moudle_exit*/
//#include <asm/uaccess.h>/**/


#define MAJOR_ID 37


static ssize_t hello_read(struct file *filp,char *buf, size_t len, loff_t *ppos);
static ssize_t hello_write(struct file *filp,char *buf, size_t len,loff_t *ppos);
static int hello_open(struct inode *inode,struct file *filp);
static int hello_release(struct inode *inode,struct file *filp);

struct file_operations *hello_fops={NULL,NULL,hello_read,hello_write,NULL};

static ssize_t hello_read(struct file *filp,char *buf, size_t len, loff_t *ppos)
{
        printk("Hello,read!\n");
        return 0;
}

static ssize_t hello_write(struct file *filp,char *buf, size_t len,loff_t *ppos){
        printk("Hello,write!\n");
        return 0;
}

static int hello_open(struct inode *inode,struct file *filp ){
        //MOD_INC_USE_COUNT;
        return 0;
}

static int hello_release( struct inode *inode,struct file *filp){
        //MOD_DEC_USE_COUNT;
        return 0;
}

int __init hello_init(void){

        int result;                
        result=register_chrdev(MAJOR_ID,"hello",hello_fops);
        if(result<0){
                printk("CAN NOT GET MAJOR!");
        }       
        printk("Hello,World!\n");       
        return 0;
}

static void __exit hello_exit(void){
        unregister_chrdev(MAJOR_ID,"hello");
        printk("Bye!\n");
}

module_init(hello_init);
module_exit(hello_exit);