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#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include <linux/wait.h>
#include <asm/semaphore.h>
MODULE_LICENSE("GPL");
#define MAJOR_NUM 254
static ssize_t globalvar_read(struct file *, char *, size_t, loff_t*);
static ssize_t globalvar_write(struct file *, const char *, size_t, loff_t*);
struct file_operations globalvar_fops =
{
¡¡read: globalvar_read,
write: globalvar_write,
};
static int global_var = 0;
static struct semaphore sem;
static wait_queue_head_t outq;
static int flag = 0;
static int __init globalvar_init(void)
{
¡¡int ret;
¡¡ret = register_chrdev(MAJOR_NUM, "globalvar", &globalvar_fops);
¡¡if (ret)
¡¡{
¡¡¡¡printk("globalvar register failure");
¡¡}
¡¡else
¡¡{
¡¡¡¡printk("globalvar register success");
¡¡¡¡init_MUTEX(&sem);
¡¡¡¡init_waitqueue_head(&outq);
¡¡}
¡¡return ret;
}
static void __exit globalvar_exit(void)
{
¡¡int ret;
¡¡ret = unregister_chrdev(MAJOR_NUM, "globalvar");
¡¡if (ret)
¡¡{
¡¡¡¡printk("globalvar unregister failure");
¡¡}
¡¡else
¡¡{
¡¡¡¡printk("globalvar unregister success");
¡¡}
}
static ssize_t globalvar_read(struct file *filp, char *buf, size_t len, loff_t *off)
{
¡¡//µÈ´ýÊý¾Ý¿É»ñµÃ
¡¡if (wait_event_interruptible(outq, flag
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