epoll server
#include <iostream>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
using namespace std;
#define MAXLINE 128
#define OPEN_MAX 100
#define LISTENQ 20
#define SERV_PORT 5000
#define INFTIM 1000
void setnonblocking(int sock)
{
int opts;
opts = fcntl(sock, F_GETFL);
if (opts < 0)
{
perror("fcntl(sock,GETFL)");
exit(1);
}
opts = opts | O_NONBLOCK;
if (fcntl(sock, F_SETFL, opts) < 0)
{
perror("fcntl(sock,SETFL,opts)");
exit(1);
}
}
int main(int argc, char *argv[])
{
int i, maxi, listenfd, connfd, sockfd, epfd, nfds, portnumber;
ssize_t n;
char line[MAXLINE];
socklen_t clilen;
portnumber = 5555;
//声明epoll_event结构体的变量,ev用于注册事件,数组用于回传要处理的事件
struct epoll_event ev, events[20];
//生成用于处理accept的epoll专用的文件描述符
epfd = epoll_create(256);
struct sockaddr_in clientaddr;
struct sockaddr_in serveraddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
//把socket设置为非阻塞方式
//setnonblocking(listenfd);
//设置与要处理的事件相关的文件描述符
ev.data.fd = listenfd;
//设置要处理的事件类型
ev.events = EPOLLIN | EPOLLET;
//ev.events=EPOLLIN;
//注册epoll事件
epoll_ctl(epfd, EPOLL_CTL_ADD, listenfd, &ev);
serveraddr.sin_family = AF_INET;
char *local_addr = "127.0.0.1";
inet_aton(local_addr, &(serveraddr.sin_addr)); //htons(portnumber);
serveraddr.sin_port = htons(portnumber);
bind(listenfd, (sockaddr *)&serveraddr, sizeof(serveraddr));
listen(listenfd, LISTENQ);
maxi = 0;
for (;;)
{
//等待epoll事件的发生
nfds = epoll_wait(epfd, events, 20, 500);
//处理所发生的所有事件
for (i = 0; i < nfds; ++i)
{
if (events[i].data.fd == listenfd) //如果新监测到一个SOCKET用户连接到了绑定的SOCKET端口,建立新的连接。
{
connfd = accept(listenfd, (sockaddr *)&clientaddr, &clilen);
if (connfd < 0)
{
perror("connfd<0");
exit(1);
}
//setnonblocking(connfd);
printf("conn fd :%ul", connfd);
char *str = inet_ntoa(clientaddr.sin_addr);
cout << "accapt a connection from " << str << endl;
//设置用于读操作的文件描述符
ev.data.fd = connfd;
//设置用于注测的读操作事件
ev.events = EPOLLIN | EPOLLET;
//ev.events=EPOLLIN;
//注册ev
epoll_ctl(epfd, EPOLL_CTL_ADD, connfd, &ev);
}
else if (events[i].events & EPOLLIN) //如果是已经连接的用户,并且收到数据,那么进行读入。
{
// cout << "EPOLLIN" << endl;
if ((sockfd = events[i].data.fd) < 0)
continue;
if ((n = read(sockfd, line, MAXLINE)) < 0)
{
if (errno == ECONNRESET)
{
close(sockfd);
events[i].data.fd = -1;
}
else
std::cout << "readline error" << std::endl;
}
else if (n == 0)
{
close(sockfd);
events[i].data.fd = -1;
}
line[n] = '0';
// cout << "read " << line << endl;
//设置用于写操作的文件描述符
ev.data.fd = sockfd;
//设置用于注测的写操作事件
ev.events = EPOLLOUT | EPOLLET;
//修改sockfd上要处理的事件为EPOLLOUT
//epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev);
}
else if (events[i].events & EPOLLOUT) // 如果有数据发送
{
sockfd = events[i].data.fd;
write(sockfd, line, n);
//设置用于读操作的文件描述符
ev.data.fd = sockfd;
//设置用于注测的读操作事件
ev.events = EPOLLIN | EPOLLET;
//修改sockfd上要处理的事件为EPOLIN
epoll_ctl(epfd, EPOLL_CTL_MOD, sockfd, &ev);
}
}
}
return 0;
}
TCP client
#include <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#define BUF_SIZE 128
void client_job(int sd);
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in my_addr; //赋值时用这个结构
sockfd = socket(AF_INET, SOCK_STREAM, 0);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(5555);
my_addr.sin_addr.s_addr = inet_addr("0.0.0.0");
bzero(&(my_addr.sin_zero), 8);
if (connect(sockfd, (sockaddr *)&my_addr, sizeof(my_addr)) < 0)
{
perror("connect()2");
exit(1);
}
client_job(sockfd);
close(sockfd);
exit(0);
}
void client_job(int sd)
{
char send_buf[BUF_SIZE];
sprintf(send_buf, "hello");
while (1)
{
if (send(sd, send_buf, 5, 0) < 0)
{
perror("send");
exit(1);
}
usleep(1000 * 500);
}
}