Checks if @stream is actually pollable. Some classes may implement #GPollableInputStream but have only certain instances of that class be pollable. If this method returns %FALSE, then the behavior of other #GPollableInputStream methods is undefined.
Creates a #GSource that triggers when @stream can be read, or @cancellable is triggered or an error occurs. The callback on the source is of the #GPollableSourceFunc type.
Get the main Gtk struct
Checks if @stream can be read.
Attempts to read up to @count bytes from @stream into @buffer, as with g_input_stream_read(). If @stream is not currently readable, this will immediately return %G_IO_ERROR_WOULD_BLOCK, and you can use g_pollable_input_stream_create_source() to create a #GSource that will be triggered when @stream is readable.
#GPollableInputStream is implemented by #GInputStreams that can be polled for readiness to read. This can be used when interfacing with a non-GIO API that expects UNIX-file-descriptor-style asynchronous I/O rather than GIO-style.