Linux内核驱动之Proc文件系统

参考文章：

·Proc文件系统

内核proc文件系统与seq接口（4）---seq_file接口编程浅析

 

/********************* proc文件系统 *************************/

static void *scull_seq_start(struct seq_file *s, loff_t *pos)
{
    if (*pos >= MEMDEV_NR_DEVS)
        return NULL; /* No more to read */
    return my_devices + *pos;
}

static void *scull_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
    (*pos)++;
    if (*pos >= MEMDEV_NR_DEVS)
        return NULL;
    return my_devices + *pos;
}
static void scull_seq_stop(struct seq_file *s, void *v)
{    /* Actually, there's nothing to do here */}


static int scull_seq_show(struct seq_file *s, void *v)
{
    struct mem_dev *dev = (struct mem_dev *) v;

    seq_printf(s, "%d-%d: %s\n",MAJOR((dev->cdev).dev),MINOR((dev->cdev).dev),dev->data);

    return 0;
}

static struct seq_operations mem_seq_ops = {
    .start = scull_seq_start,
    .next = scull_seq_next,
    .stop = scull_seq_stop,
    .show = scull_seq_show
};


static int mem_proc_open(struct inode *inode, struct file *file)
{
    return seq_open(file, &mem_seq_ops);
}

static struct file_operations mem_proc_ops = {
    .owner = THIS_MODULE,
    .open = mem_proc_open, /* 只要实现这个函数 */
    .read = seq_read,
    .llseek = seq_lseek,
    .release = seq_release
};

static struct proc_dir_entry *mydir, *pfile;

static int mem_create_proc(void)
{
    mydir = proc_mkdir("mydir", NULL);    // 创建目录
    if (!mydir) {
        printk(KERN_ERR "Can't create /proc/mydir\n");
        return -1;
    }

    pfile = create_proc_entry("pool", 0666, mydir); // 创建文件
    if (!pfile) {
        printk(KERN_ERR "Can't create /proc/mydir/pool\n");
        remove_proc_entry("mydir", NULL);

        return -1;
    }
    else
        pfile->proc_fops = &mem_proc_ops;

    return 0;
}

static void mem_remove_proc(void)
{
    remove_proc_entry("pool", mydir);
    remove_proc_entry("mydir", NULL);
}

源码： test.rar