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class GLib::SocketControlMessage

A GLib::SocketControlMessage is a special-purpose utility message that can be sent to or received from a GLib::Socket. These types of messages are often called “ancillary data”.

The message can represent some sort of special instruction to or information from the socket or can represent a special kind of transfer to the peer (for example, sending a file description over a Unix socket).

These messages are sent with GLib::Socket#send_message and received with Glib::Socket#receive_message.

To extend the set of control message that can be sent, subclass this class and override the get_size, get_level, get_type and serialize methods.

To extend the set of control messages that can be received, subclass this class and implement the deserialize method. Also, make sure your class is registered with the GLib::Type typesystem before calling GLib::Socket#receive_message to read such a message.

Class Methods

GLib::SocketControlMessage.deserialize(level, type, data)

Tries to deserialize a socket control message of a given level and type. This will ask all known (to GLib::Type) subclasses of GLib::SocketControlMessage if they can understand this kind of message and if so deserialize it into a GLib::SocketControlMessage.

If there is no implementation for this kind of control message, nil will be returned.

  • level: A socket level
  • type: A socket control message type for the given level
  • data: A String containing the message data
  • Returns: The deserialized message, or nil

Instance Methods


Returns the “level” (that is, the originating protocol) of the control message. This is often SOL_SOCKET.

Since 2.22

  • Returns: An integer describing the level

Returns the protocol specific type of the control message. For instance, for Unix fd passing this would be SCM_RIGHTS.

Since 2.22

  • Returns: An integer describing the type of control message

Converts the data in the message to bytes placed in the message.

Since 2.22

  • Returns: A String containing the serialization

Returns the space required for the control message, not including headers or alignment.

Since 2.22

  • Returns: The number of bytes required
Last modified:2010/12/27 21:59:23
References:[index-ruby-glib2] [GLib::SocketControlMessage] [GLib::UnixFDMessage] [index-ruby-gio2] [Ruby/GIO]