runng-sys

Rust FFI bindings to NNG.

Usage

Version of this crate tracks NNG: <NNG_version>-rc.<crate_version> (e.g. 1.1.1-rc.2).

To use the latest crate for the most recent stable version of NNG (1.1.1), in Cargo.toml: toml runng-sys = "1.1.1-rc"

For a more ergonomic API to NNG see runng.

Examples

```rust use runng_sys::*; use std::ffi::CString;

[test]

fn itworks() { unsafe { let url = CString::new("inproc://test").unwrap(); let url = url.asbyteswithnul().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);
}

} ```