syscall.rs/examples/hello.rs

// Copyright 2014 The syscall.rs Project Developers. See the
// COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[macro_use]
extern crate sc;

fn write(fd: usize, buf: &[u8]) {
    unsafe {
        syscall!(WRITE, fd, buf.as_ptr(), buf.len());
    }
}

fn main() {
    write(1, "Hello, world!\n".as_bytes());
}