linux udp多线程两个socket绑254.254.254.253端口28005和192.168.131.1端口15003分别发送和接受消息

下面是一个简单的示例代码，可以实现在Linux平台下使用UDP多线程方式同时绑定两个socket，分别发送和接收消息。

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

#define MAX_BUF_SIZE 1024

void *recv_thread_func(void *arg);
void *send_thread_func(void *arg);

int main() {
    // 创建接收socket
    int recv_sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (recv_sock_fd < 0) {
        perror("create recv socket error");
        exit(1);
    }

    // 创建发送socket
    int send_sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (send_sock_fd < 0) {
        perror("create send socket error");
        exit(1);
    }

    // 配置接收socket
    struct sockaddr_in recv_addr;
    memset(&recv_addr, 0, sizeof(recv_addr));
    recv_addr.sin_family = AF_INET;
    recv_addr.sin_port = htons(15003); // 绑定15003端口
    recv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind(recv_sock_fd, (struct sockaddr *)&recv_addr, sizeof(recv_addr)) < 0) {
        perror("bind recv socket error");
        exit(1);
    }

    // 配置发送socket
    struct sockaddr_in send_addr;
    memset(&send_addr, 0, sizeof(send_addr));
    send_addr.sin_family = AF_INET;
    send_addr.sin_port = htons(28005); // 绑定28005端口
    if (inet_pton(AF_INET, "254.254.254.253", &send_addr.sin_addr) <= 0) {
        perror("inet_pton error");
        exit(1);
    }

    // 创建接收线程
    pthread_t recv_thread;
    if (pthread_create(&recv_thread, NULL, recv_thread_func, (void *)&recv_sock_fd) != 0) {
        perror("create recv thread error");
        exit(1);
    }

    // 创建发送线程
    pthread_t send_thread;
    if (pthread_create(&send_thread, NULL, send_thread_func, (void *)&send_sock_fd) != 0) {
        perror("create send thread error");
        exit(1);
    }

    // 等待线程结束
    pthread_join(recv_thread, NULL);
    pthread_join(send_thread, NULL);

    // 关闭接收socket
    close(recv_sock_fd);

    // 关闭发送socket
    close(send_sock_fd);

    return 0;
}

void *recv_thread_func(void *arg) {
    int sock_fd = *(int *)arg;
    char buf[MAX_BUF_SIZE];
    struct sockaddr_in client_addr;
    socklen_t client_addr_len;

    while (1) {
        memset(&buf, 0, sizeof(buf));
        client_addr_len = sizeof(client_addr);
        int len = recvfrom(sock_fd, buf, MAX_BUF_SIZE, 0, (struct sockaddr *)&client_addr, &client_addr_len);
        if (len < 0) {
            perror("recvfrom error");
            continue;
        }
        printf("recv message: %s\n", buf);
    }

    return NULL;
}

void *send_thread_func(void *arg) {
    int sock_fd = *(int *)arg;
    char buf[MAX_BUF_SIZE];
    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(15003);
    if (inet_pton(AF_INET, "192.168.131.1", &server_addr.sin_addr) <= 0) {
        perror("inet_pton error");
        exit(1);
    }

    while (1) {
        memset(&buf, 0, sizeof(buf));
        printf("input message: ");
        fgets(buf, MAX_BUF_SIZE, stdin);
        int len = sendto(sock_fd, buf, strlen(buf), 0, (struct sockaddr *)&server_addr, sizeof(server_addr));
        if (len < 0) {
            perror("sendto error");
            continue;
        }
    }

    return NULL;
}

需要注意的是，在Linux平台下，多线程访问同一个socket可能会导致数据混乱或者奔溃，因此上述代码中，我们分别创建了两个socket，并且分别在两个线程中进行读写操作，从而避免了多线程访问同一个socket的问题。