linux udp 线程

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define BUF_SIZE 1024

void *recv_thread(void *arg) {
    int sockfd = *(int *)arg;
    char buf[BUF_SIZE];
    struct sockaddr_in client_addr;
    socklen_t addr_len = sizeof(client_addr);

    while (1) {
        ssize_t recv_len = recvfrom(sockfd, buf, BUF_SIZE, 0, (struct sockaddr *)&client_addr, &addr_len);
        if (recv_len < 0) {
            perror("recvfrom error");
            continue;
        }
        printf("Received message from %s:%d: %s
", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), buf);
    }

    return NULL;
}

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

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

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

    pthread_t tid;
    if (pthread_create(&tid, NULL, recv_thread, &sockfd) != 0) {
        perror("pthread_create error");
        exit(1);
    }

    pthread_join(tid, NULL);

    close(sockfd);
    return 0;
}