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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. | ||
|
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//! Synchronous, in-memory pipes. | ||
//! | ||
//! Currently these aren't particularly useful, there only exists bindings | ||
//! enough so that pipes can be created to child processes. | ||
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use prelude::*; | ||
use super::{Reader, Writer}; | ||
use rt::io::{io_error, read_error, EndOfFile}; | ||
use rt::local::Local; | ||
use rt::rtio::{RtioPipeObject, RtioStream, IoFactoryObject, IoFactory}; | ||
use rt::uv::pipe; | ||
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pub struct PipeStream(~RtioPipeObject); | ||
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impl PipeStream { | ||
/// Creates a new pipe initialized, but not bound to any particular | ||
/// source/destination | ||
pub fn new() -> Option<PipeStream> { | ||
let pipe = unsafe { | ||
let io: *mut IoFactoryObject = Local::unsafe_borrow(); | ||
(*io).pipe_init(false) | ||
}; | ||
match pipe { | ||
Ok(p) => Some(PipeStream(p)), | ||
Err(ioerr) => { | ||
io_error::cond.raise(ioerr); | ||
None | ||
} | ||
} | ||
} | ||
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/// Extracts the underlying libuv pipe to be bound to another source. | ||
pub fn uv_pipe(&self) -> pipe::Pipe { | ||
// Did someone say multiple layers of indirection? | ||
(**self).uv_pipe() | ||
} | ||
} | ||
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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; | ||
} | ||
} | ||
} | ||
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fn eof(&mut self) -> bool { fail!() } | ||
} | ||
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impl Writer for PipeStream { | ||
fn write(&mut self, buf: &[u8]) { | ||
match (***self).write(buf) { | ||
Ok(_) => (), | ||
Err(ioerr) => { | ||
io_error::cond.raise(ioerr); | ||
} | ||
} | ||
} | ||
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fn flush(&mut self) { fail!() } | ||
} |
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