epoll服务器创建

驱动

cs 复制代码

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/poll.h>
unsigned int major;
char kbuf[128]={0};
unsigned int *vir_rcc;
//定义等待队头
wait_queue_head_t wq_head;
//定义数据是否准备好的标志变量
int condition=0;
struct class *cls;
struct device *dev;
int i;

int mycdev_open(struct inode *inode, struct file *file)
{
 //   int a=inode->i_rdev;
   // file->private_data=(void *)MINOR(a);
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
ssize_t mycdev_read(struct file *file, char __user *ubuf, size_t size, loff_t *lof)
{
    

   //将进程切换为休眠态
    wait_event_interruptible(wq_head,condition); 
    long ret;
    ret=copy_to_user(ubuf,kbuf,size);
    if(ret)
    {
        printk("copy_to_user filed\n");
        return -EIO;
    }
    condition=0;
    return 0;
}
ssize_t mycdev_write(struct file *file, const char __user *ubuf, size_t size, loff_t *lof)
{
    long ret;
    ret=copy_from_user(kbuf,ubuf,size);
    
    if(ret)
    {
        printk("copy_from_user filed\n");
        return -EIO;
    }
    condition=1;
    //唤醒休眠的进程
    wake_up_interruptible(&wq_head);
    
 
    //判断用户输入的数据，进行不同的硬件逻辑操作
    
    return 0;
}

//封装poll方法
__poll_t mycdev_poll(struct file *file,struct poll_table_struct *wait)
{
    __poll_t mask=0;
    poll_wait(file,&wq_head,wait);
    if(condition)
    {
        mask=POLLIN;
    }
    return mask;
}
int mycdev_close (struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;

}
struct file_operations fops={
    .open=mycdev_open,
    .release=mycdev_close,
    .read=mycdev_read,
    .write=mycdev_write,
    .poll=mycdev_poll,
 //   .unlocked_ioctl=mycdev_ioctl,
};
static int __init mycdev_init(void)
{
    //初始化等待队列头
    init_waitqueue_head(&wq_head);
    major=register_chrdev(0,"myled",&fops);
    if(major<0)
    {
        printk("注册字符设备驱动失败");
        return major;
    }
    printk("注册字符设备驱动成功major=%d\n",major);
    //映射led1物理地址
    
    
    //向上提交目录
    cls = class_create(THIS_MODULE,"myled");
    if(IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        return -PTR_ERR(cls);
    }
    printk("向上提交目录信息成功\n");

    //向上提交设备节点信息
    for (i=0;i<3;i++)
    {
        dev=device_create(cls, NULL, MKDEV(major,i),NULL,"myled%d",i);
        if(IS_ERR(dev))
        {
            printk("向上提交设备节点信息失败\n");
            return -PTR_ERR(dev);
        }
    }
    printk("向上提交设备节点成功\n");
    return 0;
}
static void __exit mycdev_exit(void)
{
  
    for(i=0;i<3;i++)
    {
        device_destroy(cls,MKDEV(major,i));
    }
    class_destroy(cls);


    unregister_chrdev(major,"myled");


}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

应用程序

cs 复制代码

#include<stdio.h>
#include<sqlite3.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<sys/select.h>
#include<netinet/in.h>
#include<unistd.h>
#include<string.h>
#include<time.h>
#include<stdlib.h>
#include<sys/epoll.h>
#define PROT 6666
#define IP "192.168.250.100"
int main(int argc, char const *argv[])
{
    int fds,newfds;
    //创建流失套接字
	fds = socket(AF_INET,SOCK_STREAM,0);
	{
		if(fds<0)
		{
			perror("socket");
			printf("__%d__\n",__LINE__);
			return -1;
		}
	}
	//设置允许端口快速复用
	int reuse = 1;
	if(setsockopt(fds, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) <0)
	{
		perror("setsockopt");
		return -1;
	}
	printf("setsockopt success __%d__\n",__LINE__);

	//定义服务器信息
	struct sockaddr_in sin;
	struct sockaddr_in cin;
	socklen_t clen = sizeof(cin);
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PROT);
	sin.sin_addr.s_addr = inet_addr(IP);

	//绑定服务器信息
	if(bind(fds,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		perror("bind");
		printf("__%d__\n",__LINE__);
		return -1;
	}
	//创建监听队列
	if(listen(fds,128)<0)
	{
		perror("listen");
		printf("__%d__",__LINE__);
		return -1;
	}

    int epfd;
    struct epoll_event event;
    struct epoll_event events[10];
    
    char buf[128]={0};
    epfd=epoll_create(1);
    if(epfd<0)
    {
        printf("epoll_create filed\n");
        exit(-1);
    }
    
    //读事件
    event.events=EPOLLIN;
    event.data.fd=fds;
    if(epoll_ctl(epfd,EPOLL_CTL_ADD,fds,&event)<0)
    {
        printf("epoll_ctl add filed\n");   
    }

    

    while(1)
    {
        int ret=epoll_wait(epfd,events,10,-1);
        if(ret<0)
        {
            printf("epoll_wait filed\n");
            exit(-1);
        }
        int i;
        for(i=0;i<ret;i++)
        {
            if(events[i].data.fd==fds)
            {
                printf("1\n");
                newfds=accept(fds,(struct sockaddr *)&cin,&clen);
                printf("2\n");
                if(newfds<0)
                {
                    perror("accept");
                    exit(-1);
                }
                printf("---[%s:%d]连接成功-\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));


                event.events=EPOLLIN;
                event.data.fd=newfds;
                if(epoll_ctl(epfd,EPOLL_CTL_ADD,newfds,&event)<0)
                {
                    printf("epoll_ctl add filed\n");   
                }
            
            }

        }

    }
    return 0;
}