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| #include <linux/module.h> /* Specifically, a module */
#include <linux/kernel.h> /* We're doing kernel work */
#include <linux/proc_fs.h> /* Necessary because we use the proc fs */
#include <asm/uaccess.h> /* for copy_from_user */
#include <linux/seq_file.h> //using seq_printf
#include <linux/slab.h> // Using kzalloc
#define PROCFS_NAME "debug_sy"
MODULE_AUTHOR("Yi Sun");
static char *str = NULL;
static int my_proc_show(struct seq_file *m,void *v){
seq_printf(m,"%s\n",str);
return 0;
}
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);
}
static const struct proc_ops my_fops={
.proc_open = my_proc_open,
.proc_release = single_release,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_write = my_proc_write
};
static int __init hello_init(void){
struct proc_dir_entry *entry;
entry = proc_create(PROCFS_NAME,0777,NULL,&my_fops);
if(!entry){
return -1;
}else{
printk(KERN_INFO "create proc file successfully\n");
}
return 0;
}
static void __exit hello_exit(void){
remove_proc_entry(PROCFS_NAME,NULL);
printk(KERN_INFO "Goodbye world!\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("GPL");
|
