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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.
//! Synchronous, in-memory pipes.
//!
//! Currently these aren't particularly useful, there only exists bindings
//! enough so that pipes can be created to child processes.
use prelude::*;
use super::{Reader, Writer};
use rt::io::{io_error, read_error, EndOfFile};
use rt::local::Local;
use rt::rtio::{RtioPipe, RtioPipeObject, IoFactoryObject, IoFactory};
use rt::rtio::RtioUnboundPipeObject;
pub struct PipeStream(RtioPipeObject);
pub struct UnboundPipeStream(~RtioUnboundPipeObject);
impl PipeStream {
/// Creates a new pipe initialized, but not bound to any particular
/// source/destination
pub fn new() -> Option<UnboundPipeStream> {
let pipe = unsafe {
let io: *mut IoFactoryObject = Local::unsafe_borrow();
(*io).pipe_init(false)
};
match pipe {
Ok(p) => Some(UnboundPipeStream(p)),
Err(ioerr) => {
io_error::cond.raise(ioerr);
None
}
}
}
pub fn bind(inner: RtioPipeObject) -> PipeStream {
PipeStream(inner)
}
}
impl Reader for PipeStream {
fn read(&mut self, buf: &mut [u8]) -> Option<uint> {
match (**self).read(buf) {
Ok(read) => Some(read),
Err(ioerr) => {
// EOF is indicated by returning None
if ioerr.kind != EndOfFile {
read_error::cond.raise(ioerr);
}
return None;
}
}
}
fn eof(&mut self) -> bool { fail!() }
}
impl Writer for PipeStream {
fn write(&mut self, buf: &[u8]) {
match (**self).write(buf) {
Ok(_) => (),
Err(ioerr) => {
io_error::cond.raise(ioerr);
}
}
}
fn flush(&mut self) { fail!() }
}
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