cachestat

pub fn cachestat(
    /// The open file descriptor to retrieve statistics from.
    fd: fd_t,
    /// The byte range in `fd` to query.
    /// When `len > 0`, the range is `[off..off + len]`.
    /// When `len` == 0, the range is from `off` to the end of `fd`.
    cstat_range: *const cache_stat_range,
    /// The structure where page cache statistics are stored.
    cstat: *cache_stat,
    /// Currently unused, and must be set to `0`.
    flags: u32,
) usize {
    return syscall4(
        .cachestat,
        @as(u32, @bitCast(fd)),
        @intFromPtr(cstat_range),
        @intFromPtr(cstat),
        flags,
    );
}