pub struct IOStream { /* private fields */ }
Expand description
GIOStream
represents an object that has both read and write streams.
Generally the two streams act as separate input and output streams,
but they share some common resources and state. For instance, for
seekable streams, both streams may use the same position.
Examples of GIOStream
objects are SocketConnection
, which represents
a two-way network connection; and FileIOStream
, which represents a
file handle opened in read-write mode.
To do the actual reading and writing you need to get the substreams
with IOStreamExt::input_stream()
and
IOStreamExt::output_stream()
.
The GIOStream
object owns the input and the output streams, not the other
way around, so keeping the substreams alive will not keep the GIOStream
object alive. If the GIOStream
object is freed it will be closed, thus
closing the substreams, so even if the substreams stay alive they will
always return G_IO_ERROR_CLOSED
for all operations.
To close a stream use IOStreamExt::close()
which will close the common
stream object and also the individual substreams. You can also close
the substreams themselves. In most cases this only marks the
substream as closed, so further I/O on it fails but common state in the
GIOStream
may still be open. However, some streams may support
‘half-closed’ states where one direction of the stream is actually shut down.
Operations on GIOStream
s cannot be started while another operation on the
GIOStream
or its substreams is in progress. Specifically, an application can
read from the InputStream
and write to the
OutputStream
simultaneously (either in separate threads, or as
asynchronous operations in the same thread), but an application cannot start
any GIOStream
operation while there is a GIOStream
, GInputStream
or
GOutputStream
operation in progress, and an application can’t start any
GInputStream
or GOutputStream
operation while there is a GIOStream
operation in progress.
This is a product of individual stream operations being associated with a
given [type@GLib.MainContext] (the thread-default context at the time the
operation was started), rather than entire streams being associated with a
single GMainContext
.
GIO may run operations on GIOStream
s from other (worker) threads, and this
may be exposed to application code in the behaviour of wrapper streams, such
as BufferedInputStream
or TlsConnection
. With such
wrapper APIs, application code may only run operations on the base (wrapped)
stream when the wrapper stream is idle. Note that the semantics of such
operations may not be well-defined due to the state the wrapper stream leaves
the base stream in (though they are guaranteed not to crash).
This is an Abstract Base Class, you cannot instantiate it.
§Properties
§closed
Whether the stream is closed.
Readable
§input-stream
The InputStream
to read from.
Readable
§output-stream
The OutputStream
to write to.
Readable
§Implements
IOStreamExt
, [trait@glib::ObjectExt
], IOStreamExtManual
GLib type: GObject with reference counted clone semantics.
Implementations§
Trait Implementations§
source§impl HasParamSpec for IOStream
impl HasParamSpec for IOStream
source§impl<T: IOStreamImpl> IsSubclassable<T> for IOStream
impl<T: IOStreamImpl> IsSubclassable<T> for IOStream
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for IOStream
impl Ord for IOStream
source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl<OT: ObjectType> PartialEq<OT> for IOStream
impl<OT: ObjectType> PartialEq<OT> for IOStream
source§impl<OT: ObjectType> PartialOrd<OT> for IOStream
impl<OT: ObjectType> PartialOrd<OT> for IOStream
source§impl StaticType for IOStream
impl StaticType for IOStream
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for IOStream
impl IsA<IOStream> for FileIOStream
impl IsA<IOStream> for SimpleIOStream
impl IsA<IOStream> for SocketConnection
impl IsA<IOStream> for TcpConnection
impl IsA<IOStream> for TlsClientConnection
impl IsA<IOStream> for TlsConnection
impl IsA<IOStream> for TlsServerConnection
Auto Trait Implementations§
impl Freeze for IOStream
impl RefUnwindSafe for IOStream
impl !Send for IOStream
impl !Sync for IOStream
impl Unpin for IOStream
impl UnwindSafe for IOStream
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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T: ObjectType,
impl<T> Cast for Twhere
T: ObjectType,
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source§impl<O> IOStreamExt for O
impl<O> IOStreamExt for O
source§fn clear_pending(&self)
fn clear_pending(&self)
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source§fn input_stream(&self) -> InputStream
fn input_stream(&self) -> InputStream
source§fn output_stream(&self) -> OutputStream
fn output_stream(&self) -> OutputStream
source§fn has_pending(&self) -> bool
fn has_pending(&self) -> bool
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source§impl<O> IOStreamExtManual for O
impl<O> IOStreamExtManual for O
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