linux下socket多线程

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

#define PORT 8080
#define MAX_CLIENTS 10

void *handle_client(void *arg);

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
    pthread_t threads[MAX_CLIENTS];
    int thread_count = 0;

    // 创建socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 绑定socket
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 监听连接
    if (listen(server_fd, MAX_CLIENTS) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    printf("Server is listening on port %d\n", PORT);

    while (1) {
        // 接受新连接
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
            perror("accept");
            exit(EXIT_FAILURE);
        }

        printf("New connection, socket fd is %d, ip is : %s, port : %d\n", new_socket, inet_ntoa(address.sin_addr), ntohs(address.sin_port));

        // 创建新线程处理客户端请求
        if (thread_count < MAX_CLIENTS) {
            if (pthread_create(&threads[thread_count], NULL, handle_client, (void*)&new_socket) != 0) {
                perror("pthread_create");
                close(new_socket);
            } else {
                thread_count++;
            }
        } else {
            printf("Max clients reached, closing connection\n");
            close(new_socket);
        }
    }

    return 0;
}

void *handle_client(void *arg) {
    int new_socket = *(int*)arg;
    char buffer[1024] = {0};
    int valread;

    while (1) {
        valread = read(new_socket, buffer, 1024);
        if (valread <= 0) {
            printf("Client disconnected\n");
            break;
        }
        printf("Received message: %s\n", buffer);
        send(new_socket, buffer, strlen(buffer), 0); // Echo back
        memset(buffer, 0, sizeof(buffer));
    }

    close(new_socket);
    pthread_exit(NULL);
}