//! Asynchronous signal handling for Tokio
//!
//! This crate implements asynchronous signal handling for Tokio, an
//! asynchronous I/O framework in Rust. The primary type exported from this
//! crate, `unix::Signal`, allows listening for arbitrary signals on Unix
//! platforms, receiving them in an asynchronous fashion.
//!
//! Note that signal handling is in general a very tricky topic and should be
//! used with great care. This crate attempts to implement 'best practice' for
//! signal handling, but it should be evaluated for your own applications' needs
//! to see if it's suitable.
//!
//! The are some fundamental limitations of this crate documented on the
//! `Signal` structure as well.
//!
//! > **Note**: This crate compiles on Windows, but currently contains no
//! >           bindings. Windows does not have signals like Unix does, but it
//! >           does have a way to receive ctrl-c notifications at the console.
//! >           It's planned that this will be bound and exported outside the
//! >           `unix` module in the future!

#![doc(html_root_url = "https://docs.rs/tokio-signal/0.1")]
#![deny(missing_docs)]

#[macro_use]
extern crate futures;
extern crate tokio_core;
extern crate tokio_io;

use futures::Future;
use futures::stream::Stream;
use tokio_core::reactor::Handle;
use tokio_io::{IoStream, IoFuture};

pub mod unix;
pub mod windows;

/// Creates a stream which receives "ctrl-c" notifications sent to a process.
///
/// In general signals are handled very differently across Unix and Windows, but
/// this is somewhat cross platform in terms of how it can be handled. A ctrl-c
/// event to a console process can be represented as a stream for both Windows
/// and Unix.
///
/// This function receives a `Handle` to an event loop and returns a future
/// which when resolves yields a stream receiving all signal events. Note that
/// there are a number of caveats listening for signals, and you may wish to
/// read up on the documentation in the `unix` or `windows` module to take a
/// peek.
pub fn ctrl_c(handle: &Handle) -> IoFuture<IoStream<()>> {
    return ctrl_c_imp(handle);

    #[cfg(unix)]
    fn ctrl_c_imp(handle: &Handle) -> IoFuture<IoStream<()>> {
        unix::Signal::new(unix::libc::SIGINT, handle).map(|x| {
            x.map(|_| ()).boxed()
        }).boxed()
    }

    #[cfg(windows)]
    fn ctrl_c_imp(handle: &Handle) -> IoFuture<IoStream<()>> {
        windows::Event::ctrl_c(handle).map(|x| x.boxed()).boxed()
    }
}