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// Copyright 2015 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.
use prelude::v1::*;
use io::ErrorKind;
use io;
use libc::{self, HANDLE};
use mem;
use ptr;
use sys::cvt;
pub struct Handle(HANDLE);
unsafe impl Send for Handle {}
unsafe impl Sync for Handle {}
impl Handle {
pub fn new(handle: HANDLE) -> Handle {
Handle(handle)
}
pub fn raw(&self) -> HANDLE { self.0 }
pub fn into_raw(self) -> HANDLE {
let ret = self.0;
unsafe { mem::forget(self) }
return ret;
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
read(self.0, buf)
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
write(self.0, buf)
}
}
impl Drop for Handle {
fn drop(&mut self) {
unsafe { let _ = libc::CloseHandle(self.0); }
}
}
pub fn read(h: HANDLE, buf: &mut [u8]) -> io::Result<usize> {
let mut read = 0;
let res = cvt(unsafe {
libc::ReadFile(h, buf.as_ptr() as libc::LPVOID,
buf.len() as libc::DWORD, &mut read,
ptr::null_mut())
});
match res {
Ok(_) => Ok(read as usize),
// The special treatment of BrokenPipe is to deal with Windows
// pipe semantics, which yields this error when *reading* from
// a pipe after the other end has closed; we interpret that as
// EOF on the pipe.
Err(ref e) if e.kind() == ErrorKind::BrokenPipe => Ok(0),
Err(e) => Err(e)
}
}
pub fn write(h: HANDLE, buf: &[u8]) -> io::Result<usize> {
let mut amt = 0;
try!(cvt(unsafe {
libc::WriteFile(h, buf.as_ptr() as libc::LPVOID,
buf.len() as libc::DWORD, &mut amt,
ptr::null_mut())
}));
Ok(amt as usize)
}
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