커 널 모듈 읽 기 및 쓰기/proc 생 성

/*************************************************
 *    seq_file       proc     
 *      3.10     
 *    Author: ZhangNa
 *     Date: 2015-5-17 
 *      *************************************************/
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
static char *str = NULL;
 
/*5,  show  
 *                  
 *       proc file      */
static int my_proc_show(struct seq_file *m, void *v)
{
    /*      printfk     
 *          seq_file         
 *               ldd3 91 */
//    seq_printf(m, "current kernel time is %ld
", jiffies);
    seq_printf(m, "str is %s
", str);
    return 0;
}
 
 
 
/*3,  open write  */
static ssize_t my_proc_write(struct file *file, const char __user *buffer,
                             size_t count, loff_t *f_pos)
{
    char *tmp = kzalloc((count+1), GFP_KERNEL);
    if(!tmp)
        return -ENOMEM;
    if(copy_from_user(tmp, buffer, count))
    {
        kfree(tmp);
        return EFAULT;
    }
    kfree(str);
    str = tmp;
    return count;
}
 
static int my_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, my_proc_show, NULL);
}
 
/*2,  proc_create      flie_operations   
 *     my             ，
 *     seq single           ，       
 *       open       
 *             ldd3 93 */
static struct file_operations my_fops = {
    .owner   = THIS_MODULE,
    .open    = my_proc_open,
    .release = single_release,
    .read    = seq_read,
    .llseek  = seq_lseek,
    .write   = my_proc_write,
};
 
static int __init my_init(void)
{
    struct proc_dir_entry *file;
    /*3.10     proc      
 *           file_operations*/
    /*1,       proc     ，    flie_operations*/
    file = proc_create("abc_proc", 0644, NULL, &my_fops);
    if(!file)
        return -ENOMEM;
    return 0;
}
 
/*6,  proc  */
static void __exit my_exit(void)
{
    remove_proc_entry("abc_proc", NULL);
    kfree(str);
}
 
module_init(my_init);
module_exit(my_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("ZhangNa");