计算机网络计算机网络计算机网络

#include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <stdlib.h> #include <arpa/inet.h> #include <netinet/in.h> #include <string.h> #include <unistd.h> #define SERVER_PORT 8080 int main() { int sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd == -1) { perror("socket error\n"); exit(-1); } printf("sockfd is %d\n", sockfd); /* 设置端口复用 */ int optVal = 1; setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&optVal, sizeof(optVal)); struct sockaddr_in localAddress; /* 清楚脏数据 */ memset(&localAddress, 0, sizeof(localAddress)); localAddress.sin_family = AF_INET; //IPv4 localAddress.sin_port = htons(SERVER_PORT); localAddress.sin_addr.s_addr = INADDR_ANY; socklen_t localAddressLen = sizeof(localAddress); /* 绑定端口和IP */ int ret = bind(sockfd, (const struct sockaddr*)&localAddress, localAddressLen); if (ret == -1) { perror("bind err\n"); exit(-1); } /* 监听 */ ret = listen(sockfd, 10); if (ret == -1) { perror("listen error\n"); exit(-1); } /* */ struct sockaddr_in clientAddress; memset(&clientAddress, 0, sizeof(clientAddress)); socklen_t clientAddressLen = 0; /* accept的返回值是和【客户端】通信的文件描述符 */ int connfd = accept(sockfd, (struct sockaddr*)&clientAddress, &clientAddressLen); if (connfd == -1) { perror("accept error\n"); exit(-1); } printf("connfd is %d\n", connfd); char buffer[32] = { 0 }; strcpy(buffer, "偶像\n"); write(connfd, buffer, sizeof(buffer) - 1); /* 回收资源 */ close(connfd); close(sockfd); return 0; }