runng-sys
Rust FFI bindings to NNG.
For a more ergonomic API to NNG see runng.
Examples
extern crate runng_sys;
use runng_sys::*;
use std::ffi::CString;
#[test]
fn it_works() {
unsafe {
let url = CString::new("inproc://test").unwrap();
let url = url.as_bytes_with_nul().as_ptr() as *const i8;
// Reply socket
let mut rep_socket = nng_socket { id: 0 };
assert_eq!(0, nng_rep0_open(&mut rep_socket));
assert_eq!(0, nng_listen(rep_socket, url, std::ptr::null_mut(), 0));
// Request socket
let mut req_socket = nng_socket { id: 0 };
assert_eq!(0, nng_req0_open(&mut req_socket));
assert_eq!(0, nng_dial(req_socket, url, std::ptr::null_mut(), 0));
// Send message
let mut req_msg: *mut nng_msg = std::ptr::null_mut();
assert_eq!(0, nng_msg_alloc(&mut req_msg, 0));
// Add a value to the body of the message
let val = 0x12345678;
assert_eq!(0, nng_msg_append_u32(req_msg, val));
assert_eq!(0, nng_sendmsg(req_socket, req_msg, 0));
// Receive it
let mut recv_msg: *mut nng_msg = std::ptr::null_mut();
assert_eq!(0, nng_recvmsg(rep_socket, &mut recv_msg, 0));
// Remove our value from the body of the received message
let mut recv_val: u32 = 0;
assert_eq!(0, nng_msg_trim_u32(recv_msg, &mut recv_val));
assert_eq!(val, recv_val);
// Can't do this because nng uses network order (big-endian)
//assert_eq!(val, *(nng_msg_body(recv_msg) as *const u32));
nng_close(req_socket);
nng_close(rep_socket);
}
}