据我所知,要从内核空间通知用户空间,一种方法是使用poll.这意味着内核驱动程序应该首先提供poll方法.下面的代码是从互联网上找到的,它确实有效!
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Fortune Cookie Kernel Module");
MODULE_AUTHOR("M. Tim Jones");
#define MAX_COOKIE_LENGTH PAGE_SIZE
static struct proc_dir_entry *proc_entry;
static char *cookie_buf; // Space for fortune strings
static int write_index; // Index to write next fortune
static int read_index; // Index to read next fortune
ssize_t fortune_write( struct file *filp, const char __user *buff,
unsigned long len, void *data )
// Refer to: ssize_t (*write) (struct file *, const char __user …