nc 0.9.8

Access system calls directly
Documentation 
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/// Returns in outbufp a comma-separated list of rules from the resource limits
/// database that match the filter passed in inbuf.
pub unsafe fn rctl_get_rules(inbuf: &[u8], outbuf: &mut [u8]) -> Result<(), Errno> {
    let inbuf_ptr = inbuf.as_ptr() as usize;
    let inbuf_len = inbuf.len();
    let outbuf_ptr = outbuf.as_mut_ptr() as usize;
    let outbuf_len = outbuf.len();
    unsafe {
        syscall4(
            SYS_RCTL_GET_RULES,
            inbuf_ptr,
            inbuf_len,
            outbuf_ptr,
            outbuf_len,
        )
        .map(drop)
    }
}