1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
use {io, poll, Ready, Poll, PollOpt, Token};
use event::Evented;
use std::os::unix::io::RawFd;
/*
*
* ===== EventedFd =====
*
*/
#[derive(Debug)]
/// Adapter for [`RawFd`] providing an [`Evented`] implementation.
///
/// `EventedFd` enables registering any type with an FD with [`Poll`].
///
/// While only implementations for TCP and UDP are provided, Mio supports
/// registering any FD that can be registered with the underlying OS selector.
/// `EventedFd` provides the necessary bridge.
///
/// Note that `EventedFd` takes a `&RawFd`. This is because `EventedFd` **does
/// not** take ownership of the FD. Specifically, it will not manage any
/// lifecycle related operations, such as closing the FD on drop. It is expected
/// that the `EventedFd` is constructed right before a call to
/// [`Poll::register`]. See the examples for more detail.
///
/// # Examples
///
/// Basic usage
///
/// ```
/// # use std::error::Error;
/// # fn try_main() -> Result<(), Box<Error>> {
/// use mio::{Ready, Poll, PollOpt, Token};
/// use mio::unix::EventedFd;
///
/// use std::os::unix::io::AsRawFd;
/// use std::net::TcpListener;
///
/// // Bind a std listener
/// let listener = TcpListener::bind("127.0.0.1:0")?;
///
/// let poll = Poll::new()?;
///
/// // Register the listener
/// poll.register(&EventedFd(&listener.as_raw_fd()),
/// Token(0), Ready::readable(), PollOpt::edge())?;
/// # Ok(())
/// # }
/// #
/// # fn main() {
/// # try_main().unwrap();
/// # }
/// ```
///
/// Implementing [`Evented`] for a custom type backed by a [`RawFd`].
///
/// ```
/// use mio::{Ready, Poll, PollOpt, Token};
/// use mio::event::Evented;
/// use mio::unix::EventedFd;
///
/// use std::os::unix::io::RawFd;
/// use std::io;
///
/// pub struct MyIo {
/// fd: RawFd,
/// }
///
/// impl Evented for MyIo {
/// fn register(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt)
/// -> io::Result<()>
/// {
/// EventedFd(&self.fd).register(poll, token, interest, opts)
/// }
///
/// fn reregister(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt)
/// -> io::Result<()>
/// {
/// EventedFd(&self.fd).reregister(poll, token, interest, opts)
/// }
///
/// fn deregister(&self, poll: &Poll) -> io::Result<()> {
/// EventedFd(&self.fd).deregister(poll)
/// }
/// }
/// ```
///
/// [`RawFd`]: https://doc.rust-lang.org/std/os/unix/io/type.RawFd.html
/// [`Evented`]: ../event/trait.Evented.html
/// [`Poll`]: ../struct.Poll.html
/// [`Poll::register`]: ../struct.Poll.html#method.register
pub struct EventedFd<'a>(pub &'a RawFd);
impl<'a> Evented for EventedFd<'a> {
fn register(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
poll::selector(poll).register(*self.0, token, interest, opts)
}
fn reregister(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
poll::selector(poll).reregister(*self.0, token, interest, opts)
}
fn deregister(&self, poll: &Poll) -> io::Result<()> {
poll::selector(poll).deregister(*self.0)
}
}
|
