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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 core::prelude::*;
use io::prelude::*;
use io;
use libc::{self, c_int, size_t, c_void};
use mem;
use sys::cvt;
use sys_common::AsInner;
pub struct FileDesc {
fd: c_int,
}
impl FileDesc {
pub fn new(fd: c_int) -> FileDesc {
FileDesc { fd: fd }
}
pub fn raw(&self) -> c_int { self.fd }
/// Extract the actual filedescriptor without closing it.
pub fn into_raw(self) -> c_int {
let fd = self.fd;
unsafe { mem::forget(self) };
fd
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let ret = try!(cvt(unsafe {
libc::read(self.fd,
buf.as_mut_ptr() as *mut c_void,
buf.len() as size_t)
}));
Ok(ret as usize)
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
let ret = try!(cvt(unsafe {
libc::write(self.fd,
buf.as_ptr() as *const c_void,
buf.len() as size_t)
}));
Ok(ret as usize)
}
}
impl AsInner<c_int> for FileDesc {
fn as_inner(&self) -> &c_int { &self.fd }
}
impl Drop for FileDesc {
fn drop(&mut self) {
// closing stdio file handles makes no sense, so never do it. Also, note
// that errors are ignored when closing a file descriptor. The reason
// for this is that if an error occurs we don't actually know if the
// file descriptor was closed or not, and if we retried (for something
// like EINTR), we might close another valid file descriptor (opened
// after we closed ours.
if self.fd > libc::STDERR_FILENO {
let _ = unsafe { libc::close(self.fd) };
}
}
}
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