Method: LIBUSB::Context#on_pollfd_removed

Defined in:
lib/libusb/context.rb

#on_pollfd_removed {|pollfd| ... } ⇒ Object

Register a notification block for file descriptor removals.

This block will be invoked for every removed file descriptor that libusb uses as an event source.

To disable the notification callback, execute on_pollfd_removed without a block.

Note that the removal notifier may be called during #exit (e.g. when it is closing file descriptors that were opened and added to the poll set at #initialize time). If you don’t want this, overwrite the notifier immediately before calling #exit.

Yield Parameters:

  • pollfd (Pollfd) —

    The removed file descriptor is yielded to the block



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# File 'lib/libusb/context.rb', line 495

def on_pollfd_removed &block
  @on_pollfd_removed = if block
    proc do |fd, _|
      pollfd = Pollfd.new fd
      block.call pollfd
    end
  end
  Call.libusb_set_pollfd_notifiers @ctx, @on_pollfd_added, @on_pollfd_removed, nil
end