class: PollableOutputStream

[19:7] extends: object

GPollableOutputStream is implemented by [class@Gio.OutputStream]s that can be polled for readiness to write. This can be used when interfacing with a non-GIO API that expects UNIX-file-descriptor-style asynchronous I/O rather than GIO-style. Some classes may implement GPollableOutputStream but have only certain instances of that class be pollable. If [method@Gio.PollableOutputStream.can_poll] returns false, then the behavior of other GPollableOutputStream methods is undefined.

Members

• handleObj
• lib
• retainedCallbacks
• signalHandlerNames
• signalSetterHandlers

Methods

• PollableOutputStream (Handle = null)

  Creates a new PollableOutputStream by wrapping a native handle or another wrapper.

  • @p Handle is the native handle or another wrapper whose handle to adopt.

• toNativeHandle (Source)

  Normalizes a constructor argument into a raw pointer carrier. Accepts a raw NativeHandle, a raw NativeBuffer returned from fn.call(...), another generated wrapper exposing handle(), or null. Returns null when the argument carries no pointer.

  • @p Source is the raw handle, raw buffer, wrapper, or null.
  • @r A raw pointer carrier or null when no pointer is present.

• getLib ()

  Returns the opened native library for this generated wrapper.

  • @r The opened native library.

• handle ()

  Returns the wrapped NativeHandle.

  • @r The wrapped NativeHandle.

• isNull ()

  Returns true when the wrapped handle is null.

  • @r A bool.

• describe ()

  Returns a small string for debugging generated wrappers.

  • @r A string.

• can_poll ()

  Checks if @stream is actually pollable. Some classes may implement #GPollableOutputStream but have only certain instances of that class be pollable. If this method returns %FALSE, then the behavior of other #GPollableOutputStream methods is undefined. For any given stream, the value returned by this method is constant; a stream cannot switch from pollable to non-pollable or vice versa.

• create_source (object cancellable)

  Creates a #GSource that triggers when @stream can be written, or

  • @cancellable is triggered or an error occurs. The callback on the source is of the #GPollableSourceFunc type. As with g_pollable_output_stream_is_writable(), it is possible that the stream may not actually be writable even after the source triggers, so you should use g_pollable_output_stream_write_nonblocking() rather than g_output_stream_write() from the callback. The behaviour of this method is undefined if g_pollable_output_stream_can_poll() returns %FALSE for
  • @stream. ``
  • @p cancellable is a #GCancellable, or %NULL.

• is_writable ()

  Checks if @stream can be written. Note that some stream types may not be able to implement this 100% reliably, and it is possible that a call to g_output_stream_write() after this returns %TRUE would still block. To guarantee non-blocking behavior, you should always use g_pollable_output_stream_write_nonblocking(), which will return a %G_IO_ERROR_WOULD_BLOCK error rather than blocking. The behaviour of this method is undefined if g_pollable_output_stream_can_poll() returns %FALSE for @stream.