应用程序:文章来源:https://www.toymoban.com/news/detail-617343.html
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#define ERR_MSG(msg) \
do \
{ \
printf("line:%d\n", __LINE__); \
perror(msg); \
} while (0)
#define PORT 6666 //端口号
#define IP "192.168.250.100" // IP地址
int main(int argc, const char *argv[])
{
//创建流式套接字
int sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success sfd=%d __%d__\n", sfd, __LINE__);
//设置端口快速被复用
int reuse = 1;
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
//填充服务器自身的地址信息结构体
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
//存储客户端信息结构体
int s_res = 0;
struct sockaddr_in cin;
socklen_t len = sizeof(cin);
struct sockaddr_in savecin[1024];
//将IP地址和端口号绑定到指定的套接字文件描述符上
if (bind(sfd, (struct sockaddr *)&sin, sizeof(sin)) < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success __%d__\n", __LINE__);
//将套接字设置为被动监听状态
if (listen(sfd, 128) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("listen success __%d__\n", __LINE__);
char buf[128] = "";
ssize_t res = 0;
// epoll
int fd, newfd, epfd;
struct epoll_event event;
struct epoll_event events[10]; //存放就绪事件描述符的数组
//创建epoll句柄
epfd = epoll_create(1);
if (epfd < 0)
{
printf("epoll_create filed\n");
exit(-1);
}
event.events = EPOLLIN;
event.data.fd = sfd;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, sfd, &event) < 0)
{
printf("epoll_ctl add filed\n");
}
//监听事件是否发生
while (1)
{
//等待事件发生
int ret = epoll_wait(epfd, events, 10, -1);
if (ret < 0)
{
printf("epoll_wait filed\n");
exit(-1);
}
int i;
//循环遍历数组,做事件的处理
for (i = 0; i < ret; i++)
{
//监听到新连接
if (events[i].data.fd == sfd)
{
newfd = accept(sfd, (struct sockaddr *)&cin, &len);
if (newfd < 0)
{
perror("accept");
return -1;
}
printf("[%s:%d] 客户端连接成功 newfd=%d __%d__\n",
inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), newfd, __LINE__);
savecin[newfd] = cin;
//新客户端套接字加入epoll
event.events = EPOLLIN;
event.data.fd = newfd;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, newfd, &event) < 0)
{
printf("epoll_ctl add filed\n");
}
}
else if (events[i].data.fd == 0) //键盘输入事件
{
printf("触发键盘输入事件 __%d__\n", __LINE__);
int sndfd = -1;
res = scanf("%d %s", &sndfd, buf);
while (getchar() != 10)
;
if (res != 2)
{
printf("请输入正确数据格式:fd string\n");
continue;
}
}
else
{
//客户端交互事件
printf("触发客户端交互事件__%d__\n", __LINE__);
bzero(buf, sizeof(buf));
//接收数据
res = recv(events[i].data.fd, buf, sizeof(buf), 0);
if (res < 0)
{
ERR_MSG("recv");
return -1;
}
else if (0 == res)
{
printf("[%s:%d] 客户端下线 newfd=%d __%d__\n",
inet_ntoa(savecin[i].sin_addr), ntohs(savecin[i].sin_port), i, __LINE__);
close(i); //未接收到数据,关闭文件描述符
continue; //进入下一次循环
}
//发送数据
strcat(buf, "*_*");
if (send(events[i].data.fd, buf, sizeof(buf), 0) < 0)
{
ERR_MSG("send");
return -1;
}
printf("发送成功\n");
}
}
}
if (close(sfd) < 0)
{
ERR_MSG("close");
return -1;
}
return 0;
}
驱动程序:文章来源地址https://www.toymoban.com/news/detail-617343.html
#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>
struct class *cls;
struct device *dev;
unsigned int major;//定义一个变量保存主设备号
char kbuf[128]={0};
//定义等待队列头
wait_queue_head_t wq_head;
int condition=0;//数据是否准备好的标志变量
//封装操作方法
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *lof)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
if(size>sizeof(kbuf))//用户的需求内核满足不了
{
size=sizeof(kbuf);
}
long ret;
ret=copy_to_user(ubuf,kbuf,size);
if(ret)
{
printk("copy_to_user filed\n");
return -EIO;
}
condition=0;//表示下一次数据没有准备好
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
if(size>sizeof(kbuf))//用户的需求内核满足不了
{
size=sizeof(kbuf);
}
long ret;
ret=copy_from_user(kbuf,ubuf,size);//表示模拟硬件数据就绪
if(ret)
{
printk("copy_from_user filed\n");
return -EIO;
}
condition=1;
wake_up_interruptible(&wq_head);//唤醒休眠的进程
return 0;
}
//封装poll方法
__poll_t mycdev_poll(struct file *file, struct poll_table_struct *wait)
{
__poll_t mask=0;
//1.向上提交等待队列头
poll_wait(file,&wq_head,wait);
//2.根据事件是否发生给一个合适的返回值
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;
}
//定义一个操作方法结构体变量并且初始化
struct file_operations fops={
.open=mycdev_open,
.release=mycdev_close,
.read=mycdev_read,
.poll=mycdev_poll,
.write=mycdev_write,
};
static int __init mycdev_init(void)
{
//初始化等待队列头
init_waitqueue_head(&wq_head);
//注册字符设备驱动
major=register_chrdev(0,"mychrdev",&fops);
if(major<0)
{
printk("注册字符设备驱动失败\n");
return major;
}
printk("注册字符设备驱动成功major=%d\n",major);
// 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
dev = device_create(cls, NULL, MKDEV(major, 0), NULL, "mycdev");
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)
{
// 销毁节点信息
device_destroy(cls, MKDEV(major, 0));
// 销毁目录信息
class_destroy(cls);
//注销字符设备驱动
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
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