linux时间方面的设置

如下一段代码可以借鉴：

static void _sleep_response_timeout(modbus_t *ctx){#ifdef _WIN32    /* usleep doesn't exist on Windows */    Sleep((ctx->response_timeout.tv_sec * 1000) +          (ctx->response_timeout.tv_usec / 1000));#else    /* usleep source code */    struct timespec request, remaining;    request.tv_sec = ctx->response_timeout.tv_sec;    request.tv_nsec = ((long int)ctx->response_timeout.tv_usec % 1000000)        * 1000;    while (nanosleep(&request, &remaining) == -1 && errno == EINTR)        request = remaining;#endif}