Function k 

pub unsafe extern "C" fn k(socket: I, query: const_S, ...) -> K

Send a text query or evaluate the text query in a process which are loading the shared library. As this library is purposed to build shared object, the only choice of socket is 0. This executes against the kdb+ process in which it is loaded.

#[macro_use]
extern crate kdbplus;
use kdbplus::qtype;
use kdbplus::api::*;
use kdbplus::api::native::*;

#[no_mangle]
pub extern "C" fn dictionary_list_to_table() -> K{
  let dicts=unsafe{knk(3)};
  let dicts_slice=dicts.as_mut_slice::<K>();
  for i in 0..3{
    let keys=unsafe{ktn(qtype::SYMBOL_LIST as I, 2)};
    let keys_slice=keys.as_mut_slice::<S>();
    keys_slice[0]=unsafe{ss(str_to_S!("a"))};
    keys_slice[1]=unsafe{ss(str_to_S!("b"))};
    let values=unsafe{ktn(qtype::INT_LIST as I, 4)};
    values.as_mut_slice::<I>()[0..2].copy_from_slice(&[i*10, i*100]);
    dicts_slice[i as usize]=unsafe{xD(keys, values)};
  }
   // Format list of dictionary as a table.
   // ([] a: 0 10 20i; b: 0 100 200i)
   unsafe{k(0, str_to_S!("{[dicts] -1 _ dicts, (::)}"), dicts, KNULL)}
}

q)unfortunate_fact: `libc_api_examples 2: (`dictionary_list_to_table; 1);
q)unfortunate_fact[]
a  b  
------
0  0  
10 100
20 200