Function fcntl

components/dfs/dfs_v2/src/dfs_posix.c:631–664

* this function is a POSIX compliant version, which shall perform a variety of * control functions on devices. * * @param fildes the file description * @param cmd the specified command, Common values include: * - `F_DUPFD`: Duplicate a file descriptor. * - `F_GETFD`: Get the file descriptor flags. * - `F_SETFD`: Set the file descriptor flags. * - `F_GETFL`: Get the file sta

 * set to indicate the error.
 */
int fcntl(int fildes, int cmd, ...)
{
    int ret = -1;
    struct dfs_file *file;

    file = fd_get(fildes);
    if (file)
    {
        void *arg;
        va_list ap;

        va_start(ap, cmd);
        arg = va_arg(ap, void *);
        va_end(ap);

        ret = dfs_file_ioctl(file, cmd, arg);
        if (ret < 0)
        {
            ret = dfs_file_fcntl(fildes, cmd, (unsigned long)arg);
        }
    }
    else
    {
        ret = -EBADF;
    }

    if (ret < 0)
    {
        rt_set_errno(ret);
        ret = -1;
    }

    return ret;
}
RTM_EXPORT(fcntl);

/**