VxWorks中实现时间同步的方法

本示例代码实现了VxWorks系统中实现与NTP服务器的时间同步的方法，通过设置VxWorks系统中的时间服务参数，将与NTP服务器进行时间校准同步，确保VxWorks系统中的时钟与NTP服务器时间同步。

/*
    * Set the system clock from an NTP update.
    */
    STATUS ntpTimeSync (char *pServer)
    {
        struct sockaddr_in  serverAddr;
        STATUS          status;
        int             s;
        time_t t;
        double stime = 0.0;

        /* update the sntp client library before starting */
        if (sntp_init() != OK)
        {
            printf("can't initialize sntp\n");
            return ERROR;
        }

        memset((char *)&serverAddr, 0, sizeof(serverAddr));

        serverAddr.sin_family = AF_INET;
        serverAddr.sin_len = sizeof (serverAddr);
        serverAddr.sin_port = htons (SNTP_PORT);
        serverAddr.sin_addr.s_addr = inet_addr (pServer);

        if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
        {
            perror ("socket:");
            return ERROR;
        }

        if (connect (s, (struct sockaddr *)&serverAddr, sizeof (serverAddr)) < 0)
        {
            perror ("connect:");
            close (s);
            return ERROR;
        }

        sntpTimeQuery(s);

        if (sntpTimeGet(&t, &stime))
        {
            printf ("NTP server unavailable\n");
            close (s);
            return ERROR;
        }

        close(s);

        if (stime == 0.0) {
            if (time (NULL) == (time_t) -1)
                printf("can't set time\n");
                return ERROR;
        } else {
            struct timeval tv;

            tv.tv_sec = (long)t;
            tv.tv_usec = (long)(stime * 1000000.0);

            if (settimeofday (&tv, NULL) < 0)
            {
                printf("can't set time\n");
                return ERROR;
            }
        }

        return OK;
    }

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