Function ftruncate

components/dfs/dfs_v2/src/dfs_posix.c:703–732

* * this function is a POSIX compliant version, which cause the regular file * referenced by fd to be truncated to a size of precisely length bytes. * @param fd the file descriptor. * @param length the length to be truncated. * * @return Upon successful completion, ftruncate() shall return 0; * otherwise, -1 shall be returned and errno set to indicate the error. */

 * otherwise, -1 shall be returned and errno set to indicate the error.
 */
int ftruncate(int fd, off_t length)
{
    int result;
    struct dfs_file *file;

    file = fd_get(fd);
    if (file == NULL)
    {
        rt_set_errno(-EBADF);

        return -1;
    }

    if (length < 0)
    {
        rt_set_errno(-EINVAL);

        return -1;
    }

    result = dfs_file_ftruncate(file, length);
    if (result < 0)
    {
        rt_set_errno(result);

        return -1;
    }

    return 0;
}
RTM_EXPORT(ftruncate);

/**