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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
#![doc(html_root_url = "https://docs.rs/mio/0.6.21")]
// Mio targets old versions of the Rust compiler. In order to do this, uses
// deprecated APIs.
#![allow(bare_trait_objects, deprecated, unknown_lints)]
#![deny(missing_docs, missing_debug_implementations)]
#![cfg_attr(test, deny(warnings))]

// Many of mio's public methods violate this lint, but they can't be fixed
// without a breaking change.
#![cfg_attr(feature = "cargo-clippy", allow(clippy::trivially_copy_pass_by_ref))]

//! A fast, low-level IO library for Rust focusing on non-blocking APIs, event
//! notification, and other useful utilities for building high performance IO
//! apps.
//!
//! # Features
//!
//! * Non-blocking TCP, UDP
//! * I/O event notification queue backed by epoll, kqueue, and IOCP
//! * Zero allocations at runtime
//! * Platform specific extensions
//!
//! # Non-goals
//!
//! The following are specifically omitted from Mio and are left to the user or higher-level libraries.
//!
//! * File operations
//! * Thread pools / multi-threaded event loop
//! * Timers
//!
//! # Platforms
//!
//! Currently supported platforms:
//!
//! * Linux
//! * OS X
//! * Windows
//! * FreeBSD
//! * NetBSD
//! * Android
//! * iOS
//!
//! mio can handle interfacing with each of the event notification systems of the aforementioned platforms. The details of
//! their implementation are further discussed in [`Poll`].
//!
//! # Usage
//!
//! Using mio starts by creating a [`Poll`], which reads events from the OS and
//! put them into [`Events`]. You can handle IO events from the OS with it.
//!
//! For more detail, see [`Poll`].
//!
//! [`Poll`]: struct.Poll.html
//! [`Events`]: struct.Events.html
//!
//! # Example
//!
//! ```
//! use mio::*;
//! use mio::net::{TcpListener, TcpStream};
//!
//! // Setup some tokens to allow us to identify which event is
//! // for which socket.
//! const SERVER: Token = Token(0);
//! const CLIENT: Token = Token(1);
//!
//! let addr = "127.0.0.1:13265".parse().unwrap();
//!
//! // Setup the server socket
//! let server = TcpListener::bind(&addr).unwrap();
//!
//! // Create a poll instance
//! let poll = Poll::new().unwrap();
//!
//! // Start listening for incoming connections
//! poll.register(&server, SERVER, Ready::readable(),
//!               PollOpt::edge()).unwrap();
//!
//! // Setup the client socket
//! let sock = TcpStream::connect(&addr).unwrap();
//!
//! // Register the socket
//! poll.register(&sock, CLIENT, Ready::readable(),
//!               PollOpt::edge()).unwrap();
//!
//! // Create storage for events
//! let mut events = Events::with_capacity(1024);
//!
//! loop {
//!     poll.poll(&mut events, None).unwrap();
//!
//!     for event in events.iter() {
//!         match event.token() {
//!             SERVER => {
//!                 // Accept and drop the socket immediately, this will close
//!                 // the socket and notify the client of the EOF.
//!                 let _ = server.accept();
//!             }
//!             CLIENT => {
//!                 // The server just shuts down the socket, let's just exit
//!                 // from our event loop.
//!                 return;
//!             }
//!             _ => unreachable!(),
//!         }
//!     }
//! }
//!
//! ```

extern crate net2;
extern crate iovec;
extern crate slab;

#[cfg(target_os = "fuchsia")]
extern crate fuchsia_zircon as zircon;
#[cfg(target_os = "fuchsia")]
extern crate fuchsia_zircon_sys as zircon_sys;

#[cfg(unix)]
extern crate libc;

#[cfg(windows)]
extern crate miow;

#[cfg(windows)]
extern crate winapi;

#[cfg(windows)]
extern crate kernel32;

#[macro_use]
extern crate log;

mod event_imp;
mod io;
mod poll;
mod sys;
mod token;
mod lazycell;

pub mod net;

#[deprecated(since = "0.6.5", note = "use mio-extras instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub mod channel;

#[deprecated(since = "0.6.5", note = "use mio-extras instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub mod timer;

#[deprecated(since = "0.6.5", note = "update to use `Poll`")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub mod deprecated;

#[deprecated(since = "0.6.5", note = "use iovec crate directly")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub use iovec::IoVec;

#[deprecated(since = "0.6.6", note = "use net module instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub mod tcp {
    pub use net::{TcpListener, TcpStream};
    pub use std::net::Shutdown;
}

#[deprecated(since = "0.6.6", note = "use net module instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub mod udp;

pub use poll::{
    Poll,
    Registration,
    SetReadiness,
};
pub use event_imp::{
    PollOpt,
    Ready,
};
pub use token::Token;

pub mod event {
    //! Readiness event types and utilities.

    pub use super::poll::{Events, Iter};
    pub use super::event_imp::{Event, Evented};
}

pub use event::{
    Events,
};

#[deprecated(since = "0.6.5", note = "use events:: instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub use event::{Event, Evented};

#[deprecated(since = "0.6.5", note = "use events::Iter instead")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub use poll::Iter as EventsIter;

#[deprecated(since = "0.6.5", note = "std::io::Error can avoid the allocation now")]
#[cfg(feature = "with-deprecated")]
#[doc(hidden)]
pub use io::deprecated::would_block;

#[cfg(all(unix, not(target_os = "fuchsia")))]
pub mod unix {
    //! Unix only extensions
    pub use sys::{
        EventedFd,
    };
    pub use sys::unix::UnixReady;
}

#[cfg(target_os = "fuchsia")]
pub mod fuchsia {
    //! Fuchsia-only extensions
    //!
    //! # Stability
    //!
    //! This module depends on the [magenta-sys crate](https://crates.io/crates/magenta-sys)
    //! and so might introduce breaking changes, even on minor releases,
    //! so long as that crate remains unstable.
    pub use sys::{
        EventedHandle,
    };
    pub use sys::fuchsia::{FuchsiaReady, zx_signals_t};
}

/// Windows-only extensions to the mio crate.
///
/// Mio on windows is currently implemented with IOCP for a high-performance
/// implementation of asynchronous I/O. Mio then provides TCP and UDP as sample
/// bindings for the system to connect networking types to asynchronous I/O. On
/// Unix this scheme is then also extensible to all other file descriptors with
/// the `EventedFd` type, but on Windows no such analog is available. The
/// purpose of this module, however, is to similarly provide a mechanism for
/// foreign I/O types to get hooked up into the IOCP event loop.
///
/// This module provides two types for interfacing with a custom IOCP handle:
///
/// * `Binding` - this type is intended to govern binding with mio's `Poll`
///   type. Each I/O object should contain an instance of `Binding` that's
///   interfaced with for the implementation of the `Evented` trait. The
///   `register`, `reregister`, and `deregister` methods for the `Evented` trait
///   all have rough analogs with `Binding`.
///
///   Note that this type **does not handle readiness**. That is, this type does
///   not handle whether sockets are readable/writable/etc. It's intended that
///   IOCP types will internally manage this state with a `SetReadiness` type
///   from the `poll` module. The `SetReadiness` is typically lazily created on
///   the first time that `Evented::register` is called and then stored in the
///   I/O object.
///
///   Also note that for types which represent streams of bytes the mio
///   interface of *readiness* doesn't map directly to the Windows model of
///   *completion*. This means that types will have to perform internal
///   buffering to ensure that a readiness interface can be provided. For a
///   sample implementation see the TCP/UDP modules in mio itself.
///
/// * `Overlapped` - this type is intended to be used as the concrete instances
///   of the `OVERLAPPED` type that most win32 methods expect. It's crucial, for
///   safety, that all asynchronous operations are initiated with an instance of
///   `Overlapped` and not another instantiation of `OVERLAPPED`.
///
///   Mio's `Overlapped` type is created with a function pointer that receives
///   a `OVERLAPPED_ENTRY` type when called. This `OVERLAPPED_ENTRY` type is
///   defined in the `winapi` crate. Whenever a completion is posted to an IOCP
///   object the `OVERLAPPED` that was signaled will be interpreted as
///   `Overlapped` in the mio crate and this function pointer will be invoked.
///   Through this function pointer, and through the `OVERLAPPED` pointer,
///   implementations can handle management of I/O events.
///
/// When put together these two types enable custom Windows handles to be
/// registered with mio's event loops. The `Binding` type is used to associate
/// handles and the `Overlapped` type is used to execute I/O operations. When
/// the I/O operations are completed a custom function pointer is called which
/// typically modifies a `SetReadiness` set by `Evented` methods which will get
/// later hooked into the mio event loop.
#[cfg(windows)]
pub mod windows {

    pub use sys::{Overlapped, Binding};
}

#[cfg(feature = "with-deprecated")]
mod convert {
    use std::time::Duration;

    const NANOS_PER_MILLI: u32 = 1_000_000;
    const MILLIS_PER_SEC: u64 = 1_000;

    /// Convert a `Duration` to milliseconds, rounding up and saturating at
    /// `u64::MAX`.
    ///
    /// The saturating is fine because `u64::MAX` milliseconds are still many
    /// million years.
    pub fn millis(duration: Duration) -> u64 {
        // Round up.
        let millis = (duration.subsec_nanos() + NANOS_PER_MILLI - 1) / NANOS_PER_MILLI;
        duration.as_secs().saturating_mul(MILLIS_PER_SEC).saturating_add(u64::from(millis))
    }
}