在VxWorks环境下实现基于UDP的网络通信

本示例代码介绍了如何在VxWorks嵌入式系统中使用UDP协议进行网络通信。通过使用socket API，实现了客户端和服务器端之间的消息传递。示例代码注重细节处理，包括缓冲区的分配和释放、地址结构的初始化等。

#define SERVER_PORT 20001
#define CLIENT_PORT 20002
#define SERVER_IP   "192.168.0.1"

void udp_server(void)
{
    int sockfd;
    struct sockaddr_in server_addr;
    struct sockaddr_in client_addr;
    char buf[1024];
    int len = sizeof(struct sockaddr_in);
    int n;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));

    while(1)
    {
        bzero(buf, sizeof(buf));
        n = recvfrom(sockfd, buf, sizeof(buf), 0, (struct sockaddr *)&client_addr, &len);

        if(n > 0)
        {
            printf("recvfrom %s:%d %d bytes: %s\n",
                   inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port),
                   n, buf);
        }
    }
}

void udp_client(void)
{
    int sockfd;
    struct sockaddr_in server_addr;
    char buf[1024];
    int n;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr);

    while(1)
    {
        printf("Please input message:\n");
        scanf("%s", buf);

        n = sendto(sockfd, buf, strlen(buf), 0, (struct sockaddr *)&server_addr, sizeof(server_addr));

        if(n > 0)
        {
            printf("sendto server %d bytes: %s\n", n, buf);
        }
    }
}

int main(void)
{
    taskSpawn("tUdpServer", 150, 0, 10000,
              (FUNCPTR)udp_server, 0,0,0,0,0,0,0,0,0,0);
    taskSpawn("tUdpClient", 150, 0, 10000,
              (FUNCPTR)udp_client, 0,0,0,0,0,0,0,0,0,0);

    return(0);
}

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