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基于epoll的TCP服务器端(C++)

news 2025/8/6 20:42:56

网络编程——C++实现socket通信(TCP)高并发之epoll模式_tcp通信c++ 多客户端epoll_n大橘为重n的博客-CSDN博客

网络编程——C++实现socket通信(TCP)高并发之select模式_n大橘为重n的博客-CSDN博客

server.cpp

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <ctype.h>
#include <sys/epoll.h>	//epoll头文件#define MAXSIZE 1024
#define IP_ADDR "127.0.0.1"
#define IP_PORT 8888int main()
{int i_listenfd, i_connfd;struct sockaddr_in st_sersock;char msg[MAXSIZE];int nrecvSize = 0;struct epoll_event ev, events[MAXSIZE];int epfd, nCounts;	//epfd:epoll实例句柄, nCounts:epoll_wait返回值if((i_listenfd = socket(AF_INET, SOCK_STREAM, 0) ) < 0)	//建立socket套接字{printf("socket Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}memset(&st_sersock, 0, sizeof(st_sersock));st_sersock.sin_family = AF_INET;  //IPv4协议st_sersock.sin_addr.s_addr = htonl(INADDR_ANY);	//INADDR_ANY转换过来就是0.0.0.0，泛指本机的意思，也就是表示本机的所有IP，因为有些机子不止一块网卡，多网卡的情况下，这个就表示所有网卡ip地址的意思。st_sersock.sin_port = htons(IP_PORT);if(bind(i_listenfd,(struct sockaddr*)&st_sersock, sizeof(st_sersock)) < 0) //将套接字绑定IP和端口用于监听{printf("bind Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}if(listen(i_listenfd, 20) < 0)	//设定可同时排队的客户端最大连接个数{printf("listen Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}if((epfd = epoll_create(MAXSIZE)) < 0)	//创建epoll实例{printf("epoll_create Error: %s (errno: %d)\n", strerror(errno), errno);exit(-1);}ev.events = EPOLLIN;ev.data.fd = i_listenfd;if(epoll_ctl(epfd, EPOLL_CTL_ADD, i_listenfd, &ev) < 0){printf("epoll_ctl Error: %s (errno: %d)\n", strerror(errno), errno);exit(-1);}printf("======waiting for client's request======\n");//准备接受客户端连接while(1){if((nCounts = epoll_wait(epfd, events, MAXSIZE, -1)) < 0){printf("epoll_ctl Error: %s (errno: %d)\n", strerror(errno), errno);exit(-1);}else if(nCounts == 0){printf("time out, No data!\n");}else{for(int i = 0; i < nCounts; i++){int tmp_epoll_recv_fd = events[i].data.fd;if(tmp_epoll_recv_fd == i_listenfd)	//有客户端连接请求{if((i_connfd = accept(i_listenfd, (struct sockaddr*)NULL, NULL)) < 0)	//阻塞等待客户端连接{printf("accept Error: %s (errno: %d)\n", strerror(errno), errno);//	continue;}	else{printf("Client[%d], welcome!\n", i_connfd);}ev.events = EPOLLIN;ev.data.fd = i_connfd;if(epoll_ctl(epfd, EPOLL_CTL_ADD, i_connfd, &ev) < 0){printf("epoll_ctl Error: %s (errno: %d)\n", strerror(errno), errno);exit(-1);}}else	//若是已连接的客户端发来数据请求{//接受客户端发来的消息并作处理(小写转大写)后回写给客户端memset(msg, 0 ,sizeof(msg));if((nrecvSize = read(tmp_epoll_recv_fd, msg, MAXSIZE)) < 0){printf("read Error: %s (errno: %d)\n", strerror(errno), errno);continue;}else if( nrecvSize == 0)	//read返回0代表对方已close断开连接。{printf("client has disconnected!\n");epoll_ctl(epfd, EPOLL_CTL_DEL, tmp_epoll_recv_fd, NULL);close(tmp_epoll_recv_fd);  //continue;}else{printf("recvMsg:%s", msg);for(int i=0; msg[i] != '\0'; i++){msg[i] = toupper(msg[i]);}if(write(tmp_epoll_recv_fd, msg, strlen(msg)+1) < 0){printf("write Error: %s (errno: %d)\n", strerror(errno), errno);}}}}}}//whileclose(i_listenfd);close(epfd);return 0;
}

client.cpp

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <signal.h>
#include <arpa/inet.h>#define MAXSIZE 1024
#define IP_ADDR "127.0.0.1"
#define IP_PORT 8888int i_sockfd = -1;void SigCatch(int sigNum)	//信号捕捉函数(捕获Ctrl+C)
{if(i_sockfd != -1){close(i_sockfd);}printf("Bye~! Will Exit...\n");exit(0);
}int main()
{struct sockaddr_in st_clnsock;char msg[1024];int nrecvSize = 0;signal(SIGINT, SigCatch);	//注册信号捕获函数if((i_sockfd = socket(AF_INET, SOCK_STREAM, 0) ) < 0)	//建立套接字{printf("socket Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}memset(&st_clnsock, 0, sizeof(st_clnsock));st_clnsock.sin_family = AF_INET;  //IPv4协议//IP地址转换(直接可以从物理字节序的点分十进制 转换成网络字节序)if(inet_pton(AF_INET, IP_ADDR, &st_clnsock.sin_addr) <= 0){printf("inet_pton Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}st_clnsock.sin_port = htons(IP_PORT);	//端口转换(物理字节序到网络字节序)if(connect(i_sockfd, (struct sockaddr*)&st_clnsock, sizeof(st_clnsock)) < 0)	//主动向设置的IP和端口号的服务端发出连接{printf("connect Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}printf("======connect to server, sent data======\n");while(1)	//循环输入，向服务端发送数据并接受服务端返回的数据{fgets(msg, MAXSIZE, stdin);printf("will send: %s", msg);if(write(i_sockfd, msg, MAXSIZE) < 0)	//发送数据{printf("write Error: %s (errno: %d)\n", strerror(errno), errno);exit(0);}memset(msg, 0, sizeof(msg));if((nrecvSize = read(i_sockfd, msg, MAXSIZE)) < 0)	//接受数据{printf("read Error: %s (errno: %d)\n", strerror(errno), errno);}else if(nrecvSize == 0){printf("Service Close!\n");}else{printf("Server return: %s\n", msg);}}return 0;
}

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