c语言实现socket通信

server.c端

#include <stdio.h>  
#include <stdlib.h>  
#include <errno.h>  
#include <string.h>  
#include <sys/types.h>  
#include <netinet/in.h>  
#include <sys/socket.h>  
#include <sys/wait.h>  
#include <unistd.h> // For close()  
  
#define SERVER_PORT 8888  
  
int main() {  
    int serverSocket;  
    struct sockaddr_in server_addr, client_addr;  
    socklen_t addr_len = sizeof(client_addr);  
    int clientsocket;  
    char buffer[200];  
    int iDateNum;  
  
    // 创建服务端套接字  
    if ((serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {  
        perror("socket");  
        return 1;  
    }  
  
    memset(&server_addr, 0, sizeof(server_addr));  
    server_addr.sin_family = AF_INET;  
    server_addr.sin_port = htons(SERVER_PORT);  
    server_addr.sin_addr.s_addr = INADDR_ANY;  
  
    // 绑定套接字  
    if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {  
        perror("bind");  
        close(serverSocket);  
        return 1;  
    }  
  
    // 开始监听  
    if (listen(serverSocket, 5) < 0) {  
        perror("listen");  
        close(serverSocket);  
        return 1;  
    }  
  
    printf("监听端口:%d\n", SERVER_PORT);  
  
    // 接受客户端连接  
    clientsocket = accept(serverSocket, (struct sockaddr *)&client_addr, &addr_len);  
    if (clientsocket < 0) {  
        perror("accept");  
        close(serverSocket);  
        return 1;  
    }  
    printf("等待消息...\n");  
    printf("IP is %d\n", inet_ntoa(client_addr.sin_addr));  
    printf("Port is %d\n", ntohs(client_addr.sin_port));  
  
    while (1) {  
        buffer[0] = '\0';  
        iDateNum = recv(clientsocket, buffer, 1024, 0);  
        if (iDateNum <= 0) {  
            break;  
        }  
        buffer[iDateNum] = '\0';  
        if (strcmp(buffer, "quit") == 0) {  
            break;  
        }  
        printf("收到消息:%s\n", buffer);  
        printf("发送消息:");  
        scanf("%199s", buffer); // 防止缓冲区溢出  
        send(clientsocket, buffer, strlen(buffer), 0);  
        if (strcmp(buffer, "quit") == 0) {  
            break;  
        }  
    }  
  
    close(clientsocket);  
    close(serverSocket);  
  
    return 0;  
}

client.c端

#include <stdio.h>  
#include <stdlib.h>  
#include <errno.h>  
#include <string.h>  
#include <sys/types.h>  
#include <netinet/in.h>  
#include <sys/socket.h>  
#include <unistd.h> // for close()  
  
#define SERVER_PORT 8888  
  
int main() {  
    int serverSocket;  
    struct sockaddr_in server_addr;  
    char sendbuf[200];  
    char recvbuf[200];  
    int iDateNum;  
  
    // 创建客户端套接字  
    if ((serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {  
        perror("socket");  
        return 1;  
    }  
  
    server_addr.sin_family = AF_INET;  
    server_addr.sin_port = htons(SERVER_PORT);  
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  
  
    // 连接服务端  
    if (connect(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {  
        perror("connect");  
        close(serverSocket);  
        return 1;  
    }  
  
    printf("连接到主机...\n");  
  
    // 发送接收消息  
    while (1) {  
        printf("发送消息: ");  
        if (fgets(sendbuf, sizeof(sendbuf), stdin) == NULL) {  
            perror("fgets");  
            break;  
        }  
        // 去除换行符  
        sendbuf[strcspn(sendbuf, "\n")] = 0;  
  
        send(serverSocket, sendbuf, strlen(sendbuf), 0);  
        if (strcmp(sendbuf, "quit") == 0) break;  
  
        printf("读取消息：");  
        iDateNum = recv(serverSocket, recvbuf, sizeof(recvbuf) - 1, 0);  
        if (iDateNum < 0) {  
            perror("recv");  
            break;  
        }  
        recvbuf[iDateNum] = '\0';  
        printf("%s\n", recvbuf);  
    }  
  
    close(serverSocket);  
    return 0;  
}