[−][src]Struct mio::unix::UnixReady

pub struct UnixReady(_);

Unix specific extensions to Ready

Provides additional readiness event kinds that are available on unix platforms. Unix platforms are able to provide readiness events for additional socket events, such as HUP and error.

HUP events occur when the remote end of a socket hangs up. In the TCP case, this occurs when the remote end of a TCP socket shuts down writes.

Error events occur when the socket enters an error state. In this case, the socket will also receive a readable or writable event. Reading or writing to the socket will result in an error.

Conversion traits are implemented between Ready and UnixReady. See the examples.

For high level documentation on polling and readiness, see Poll.

Examples

Most of the time, all that is needed is using bit operations

use mio::Ready;
use mio::unix::UnixReady;

let ready = Ready::readable() | UnixReady::hup();

assert!(ready.is_readable());
assert!(UnixReady::from(ready).is_hup());

Basic conversion between ready types.

use mio::Ready;
use mio::unix::UnixReady;

// Start with a portable ready
let ready = Ready::readable();

// Convert to a unix ready, adding HUP
let mut unix_ready = UnixReady::from(ready) | UnixReady::hup();

unix_ready.insert(UnixReady::error());

// `unix_ready` maintains readable interest
assert!(unix_ready.is_readable());
assert!(unix_ready.is_hup());
assert!(unix_ready.is_error());

// Convert back to `Ready`
let ready = Ready::from(unix_ready);

// Readable is maintained
assert!(ready.is_readable());

Registering readable and error interest on a socket

use mio::{Ready, Poll, PollOpt, Token};
use mio::net::TcpStream;
use mio::unix::UnixReady;

let addr = "216.58.193.68:80".parse()?;
let socket = TcpStream::connect(&addr)?;

let poll = Poll::new()?;

poll.register(&socket,
              Token(0),
              Ready::readable() | UnixReady::error(),
              PollOpt::edge())?;

Methods

`impl UnixReady`[src]

`pub fn error() -> UnixReady`[src]

Returns a Ready representing error readiness.

Note that only readable and writable readiness is guaranteed to be supported on all platforms. This means that error readiness should be treated as a hint. For more details, see readiness in the poll documentation.

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::error();

assert!(ready.is_error());

`pub fn hup() -> UnixReady`[src]

Returns a Ready representing HUP readiness.

A HUP (or hang-up) signifies that a stream socket peer closed the connection, or shut down the writing half of the connection.

Note that only readable and writable readiness is guaranteed to be supported on all platforms. This means that hup readiness should be treated as a hint. For more details, see readiness in the poll documentation. It is also unclear if HUP readiness will remain in 0.7. See here.

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::hup();

assert!(ready.is_hup());

`pub fn priority() -> UnixReady`[src]

Returns a Ready representing priority (EPOLLPRI) readiness

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::priority();

assert!(ready.is_priority());

`pub fn is_error(&self) -> bool`[src]

Returns true if the value includes error readiness

Note that only readable and writable readiness is guaranteed to be supported on all platforms. This means that error readiness should be treated as a hint. For more details, see readiness in the poll documentation.

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::error();

assert!(ready.is_error());

`pub fn is_hup(&self) -> bool`[src]

Returns true if the value includes HUP readiness

A HUP (or hang-up) signifies that a stream socket peer closed the connection, or shut down the writing half of the connection.

Note that only readable and writable readiness is guaranteed to be supported on all platforms. This means that hup readiness should be treated as a hint. For more details, see readiness in the poll documentation.

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::hup();

assert!(ready.is_hup());

`pub fn is_priority(&self) -> bool`[src]

Returns true if Ready contains priority (EPOLLPRI) readiness

See Poll for more documentation on polling.

Examples

use mio::unix::UnixReady;

let ready = UnixReady::priority();

assert!(ready.is_priority());

Methods from Deref<Target = Ready>

`pub fn is_empty(&self) -> bool`[src]

Returns true if Ready is the empty set

See Poll for more documentation on polling.

Examples

use mio::Ready;

let ready = Ready::empty();
assert!(ready.is_empty());

`pub fn is_readable(&self) -> bool`[src]

Returns true if the value includes readable readiness

See Poll for more documentation on polling.

Examples

use mio::Ready;

let ready = Ready::readable();

assert!(ready.is_readable());

`pub fn is_writable(&self) -> bool`[src]

Returns true if the value includes writable readiness

See Poll for more documentation on polling.

Examples

use mio::Ready;

let ready = Ready::writable();

assert!(ready.is_writable());

`pub fn insert<T: Into<Self>>(&mut self, other: T)`[src]

Adds all readiness represented by other into self.

This is equivalent to *self = *self | other.

Examples

use mio::Ready;

let mut readiness = Ready::empty();
readiness.insert(Ready::readable());

assert!(readiness.is_readable());

`pub fn remove<T: Into<Self>>(&mut self, other: T)`[src]

Removes all options represented by other from self.

This is equivalent to *self = *self & !other.

Examples

use mio::Ready;

let mut readiness = Ready::readable();
readiness.remove(Ready::readable());

assert!(!readiness.is_readable());

`pub fn contains<T: Into<Self>>(&self, other: T) -> bool`[src]

Returns true if self is a superset of other.

other may represent more than one readiness operations, in which case the function only returns true if self contains all readiness specified in other.

See Poll for more documentation on polling.

Examples

use mio::Ready;

let readiness = Ready::readable();

assert!(readiness.contains(Ready::readable()));
assert!(!readiness.contains(Ready::writable()));

use mio::Ready;

let readiness = Ready::readable() | Ready::writable();

assert!(readiness.contains(Ready::readable()));
assert!(readiness.contains(Ready::writable()));

use mio::Ready;

let readiness = Ready::readable() | Ready::writable();

assert!(!Ready::readable().contains(readiness));
assert!(readiness.contains(readiness));

`pub fn as_usize(&self) -> usize`[src]

Returns a usize representation of the Ready value.

This usize representation must be treated as opaque. There is no guaranteed correlation between the returned value and platform defined constants. Also, there is no guarantee that the usize representation will remain constant across patch releases of Mio.

This function is mainly provided to allow the caller to store a readiness value in an AtomicUsize.

Examples

use mio::Ready;

let ready = Ready::readable();
let ready_usize = ready.as_usize();
let ready2 = Ready::from_usize(ready_usize);

assert_eq!(ready, ready2);