Function timerfd_do_create

components/libc/posix/io/timerfd/timerfd.c:183–273

}

static int timerfd_do_create(int clockid, int flags)
{
    struct rt_timerfd *tfd = RT_NULL;
    struct dfs_file *df;
    rt_err_t ret = -1;
    int fd = -1;

    if ((flags & ~TFD_SHARED_FCNTL_FLAGS) ||
        (clockid != CLOCK_MONOTONIC &&
         clockid != CLOCK_REALTIME &&
         clockid != CLOCK_REALTIME_ALARM &&
         clockid != CLOCK_BOOTTIME &&
         clockid != CLOCK_BOOTTIME_ALARM))
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    if ((clockid == CLOCK_REALTIME_ALARM ||
         clockid == CLOCK_BOOTTIME_ALARM))
    {
        rt_set_errno(EPERM);
        return -1;
    }

    fd = fd_new();
    if (fd < 0)
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    ret = fd;
    df = fd_get(fd);

    if (df)
    {
        df->flags |= flags;

        tfd = (struct rt_timerfd *)rt_calloc(1, sizeof(struct rt_timerfd));

        if (tfd)
        {
            rt_mutex_init(&tfd->lock, TIMERFD_MUTEX_NAME, RT_IPC_FLAG_FIFO);
            rt_wqueue_init(&tfd->timerfd_queue);

            tfd->isperiodic = INIT_PERIODIC;
            tfd->ticks = 0;
            tfd->timeout_num = 0;
            tfd->tick_out = 0;
            tfd->clockid = clockid;
            tfd->timer = RT_NULL;
            tfd->pre_time.tv_sec = 0;
            tfd->pre_time.tv_nsec = 0;
            tfd->wqn.polling_thread = rt_thread_self();
            rt_list_init(&(tfd->wqn.list));
            tfd->wqn.wakeup = timerfd_wqueue_callback;