我想在本地linux上多进程进行socket通信，输出client和server侧示例代码

可以使用fork()函数创建多个进程，每个进程都可以通过socket进行通信。以下是一个简单的示例代码：

Server端示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define PORT 8888
#define MAX_CONN 5

int main() {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {};
    char *hello = "Hello from server";
    
    // 创建socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, )) == ) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // 设置socket选项
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    // 绑定socket
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < ) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    
    // 监听socket
    if (listen(server_fd, MAX_CONN) < ) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    
    // 接受连接请求
    while (1) {
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < ) {
            perror("accept");
            exit(EXIT_FAILURE);
        }
        
        // 创建子进程处理连接
        if (fork() == ) {
            close(server_fd);
            
            // 读取客户端发送的数据
            valread = read(new_socket, buffer, 1024);
            printf("%s\n", buffer);
            
            // 发送数据给客户端
            send(new_socket, hello, strlen(hello), );
            printf("Hello message sent\n");
            
            close(new_socket);
            exit();
        }
        
        close(new_socket);
    }
    
    return ;
}

Client端示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define PORT 8888

int main(int argc, char const *argv[]) {
    int sock = , valread;
    struct sockaddr_in serv_addr;
    char *hello = "Hello from client";
    char buffer[1024] = {};
    
    // 创建socket
    if ((sock = socket(AF_INET, SOCK_STREAM, )) < ) {
        printf("\n Socket creation error \n");
        return -1;
    }
    
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    
    // 将IP地址从点分十进制转换为二进制格式
    if(inet_pton(AF_INET, "127...1", &serv_addr.sin_addr)<=) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }
    
    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < ) {
        printf("\nConnection Failed \n");
        return -1;
    }
    
    // 发送数据给服务器
    send(sock, hello, strlen(hello), );
    printf("Hello message sent\n");
    
    // 读取服务器发送的数据
    valread = read(sock, buffer, 1024);
    printf("%s\n", buffer);
    
    return ;
}