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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.
use std::libc;
use std::io::IoError;
use std::rt::rtio::RtioTTY;
use homing::{HomingIO, HomeHandle};
use stream::StreamWatcher;
use super::{UvError, UvHandle, uv_error_to_io_error};
use uvio::UvIoFactory;
use uvll;
pub struct TtyWatcher{
tty: *uvll::uv_tty_t,
stream: StreamWatcher,
home: HomeHandle,
fd: libc::c_int,
}
impl TtyWatcher {
pub fn new(io: &mut UvIoFactory, fd: libc::c_int, readable: bool)
-> Result<TtyWatcher, UvError>
{
// libuv may succeed in giving us a handle (via uv_tty_init), but if the
// handle isn't actually connected to a terminal there are frequently
// many problems in using it with libuv. To get around this, always
// return a failure if the specified file descriptor isn't actually a
// TTY.
//
// Related:
// - https://github.com/joyent/libuv/issues/982
// - https://github.com/joyent/libuv/issues/988
let guess = unsafe { uvll::guess_handle(fd) };
if readable && guess != uvll::UV_TTY as libc::c_int {
return Err(UvError(uvll::EBADF));
}
// libuv was recently changed to not close the stdio file descriptors,
// but it did not change the behavior for windows. Until this issue is
// fixed, we need to dup the stdio file descriptors because otherwise
// uv_close will close them
let fd = if cfg!(windows) && fd <= libc::STDERR_FILENO {
unsafe { libc::dup(fd) }
} else { fd };
// If this file descriptor is indeed guessed to be a tty, then go ahead
// with attempting to open it as a tty.
let handle = UvHandle::alloc(None::<TtyWatcher>, uvll::UV_TTY);
match unsafe {
uvll::uv_tty_init(io.uv_loop(), handle, fd as libc::c_int,
readable as libc::c_int)
} {
0 => {
Ok(TtyWatcher {
tty: handle,
stream: StreamWatcher::new(handle),
home: io.make_handle(),
fd: fd,
})
}
n => {
unsafe { uvll::free_handle(handle) }
Err(UvError(n))
}
}
}
}
impl RtioTTY for TtyWatcher {
fn read(&mut self, buf: &mut [u8]) -> Result<uint, IoError> {
let _m = self.fire_homing_missile();
self.stream.read(buf).map_err(uv_error_to_io_error)
}
fn write(&mut self, buf: &[u8]) -> Result<(), IoError> {
let _m = self.fire_homing_missile();
self.stream.write(buf).map_err(uv_error_to_io_error)
}
fn set_raw(&mut self, raw: bool) -> Result<(), IoError> {
let raw = raw as libc::c_int;
let _m = self.fire_homing_missile();
match unsafe { uvll::uv_tty_set_mode(self.tty, raw) } {
0 => Ok(()),
n => Err(uv_error_to_io_error(UvError(n)))
}
}
#[allow(unused_mut)]
fn get_winsize(&mut self) -> Result<(int, int), IoError> {
let mut width: libc::c_int = 0;
let mut height: libc::c_int = 0;
let widthptr: *libc::c_int = &width;
let heightptr: *libc::c_int = &width;
let _m = self.fire_homing_missile();
match unsafe { uvll::uv_tty_get_winsize(self.tty,
widthptr, heightptr) } {
0 => Ok((width as int, height as int)),
n => Err(uv_error_to_io_error(UvError(n)))
}
}
fn isatty(&self) -> bool {
unsafe { uvll::guess_handle(self.fd) == uvll::UV_TTY as libc::c_int }
}
}
impl UvHandle<uvll::uv_tty_t> for TtyWatcher {
fn uv_handle(&self) -> *uvll::uv_tty_t { self.tty }
}
impl HomingIO for TtyWatcher {
fn home<'a>(&'a mut self) -> &'a mut HomeHandle { &mut self.home }
}
impl Drop for TtyWatcher {
fn drop(&mut self) {
let _m = self.fire_homing_missile();
self.close_async_();
}
}
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