linux udp 多线程

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

void *handle_client(void *arg) {
    int sockfd = *(int*)arg;
    struct sockaddr_in client_addr;
    socklen_t addr_len = sizeof(client_addr);
    char buffer[1024];

    while (1) {
        int n = recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr*)&client_addr, &addr_len);
        if (n < 0) {
            perror("recvfrom");
            break;
        }
        buffer[n] = '\0';
        printf("Received: %s\n", buffer);
        sendto(sockfd, buffer, n, 0, (struct sockaddr*)&client_addr, addr_len);
    }
    return NULL;
}

int main() {
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        return 1;
    }

    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind");
        close(sockfd);
        return 1;
    }

    pthread_t thread;
    while (1) {
        pthread_create(&thread, NULL, handle_client, &sockfd);
        pthread_detach(thread);
    }

    close(sockfd);
    return 0;
}

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

int main() {
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        return 1;
    }

    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr);

    char buffer[1024];
    while (1) {
        printf("Enter message: ");
        fgets(buffer, sizeof(buffer), stdin);
        sendto(sockfd, buffer, strlen(buffer), 0, (struct sockaddr*)&server_addr, sizeof(server_addr));

        int n = recvfrom(sockfd, buffer, sizeof(buffer), 0, NULL, NULL);
        if (n < 0) {
            perror("recvfrom");
            break;
        }
        buffer[n] = '\0';
        printf("Received: %s", buffer);
    }

    close(sockfd);
    return 0;
}