class Gio::SocketControlMessage

Overview

A #GSocketControlMessage is a special-purpose utility message that can be sent to or received from a #GSocket. 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 descriptor over a UNIX socket).

These messages are sent with g_socket_send_message() and received with g_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 GType typesystem before calling g_socket_receive_message() to read such a message.

Direct Known Subclasses

Defined in:

auto/gio-2.0/socket_control_message.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from class GObject::Object

bind_property(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags) : GObject::Binding bind_property, bind_property_full(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags, transform_to : GObject::Closure, transform_from : GObject::Closure) : GObject::Binding bind_property_full, data(key : String) : Pointer(Void)? data, finalize finalize, freeze_notify : Nil freeze_notify, getv(names : Enumerable(String), values : Enumerable(_)) : Nil getv, notify(property_name : String) : Nil notify, notify_by_pspec(pspec : GObject::ParamSpec) : Nil notify_by_pspec, notify_signal notify_signal, property(property_name : String, value : _) : Nil property, qdata(quark : UInt32) : Pointer(Void)? qdata, ref_count ref_count, run_dispose : Nil run_dispose, set_data(key : String, data : Pointer(Void)?) : Nil set_data, set_property(property_name : String, value : _) : Nil set_property, steal_data(key : String) : Pointer(Void)? steal_data, steal_qdata(quark : UInt32) : Pointer(Void)? steal_qdata, thaw_notify : Nil thaw_notify, to_unsafe : Pointer(Void) to_unsafe, watch_closure(closure : GObject::Closure) : Nil watch_closure

Constructor methods inherited from class GObject::Object

cast(obj : GObject::Object) : self cast, cast?(obj : GObject::Object) : self? cast?, new new, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter)) : self newv

Class methods inherited from class GObject::Object

compat_control(what : UInt64, data : Pointer(Void)?) : UInt64 compat_control, g_type : UInt64 g_type, interface_find_property(g_iface : GObject::TypeInterface, property_name : String) : GObject::ParamSpec interface_find_property, interface_list_properties(g_iface : GObject::TypeInterface) : Enumerable(GObject::ParamSpec) interface_list_properties

Constructor Detail

def self.new #

Initialize a new SocketControlMessage.


Class Method Detail

def self.deserialize(level : Int32, type : Int32, data : Enumerable(UInt8)) : Gio::SocketControlMessage #

Tries to deserialize a socket control message of a given @level and @type. This will ask all known (to GType) subclasses of #GSocketControlMessage if they can understand this kind of message and if so deserialize it into a #GSocketControlMessage.

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


def self.g_type : UInt64 #

Returns the type id (GType) registered in GLib type system.


Instance Method Detail

def level : Int32 #

Returns the "level" (i.e. the originating protocol) of the control message. This is often SOL_SOCKET.


def msg_type : Int32 #

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


def serialize(data : Pointer(Void)) : Nil #

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

@data is guaranteed to have enough space to fit the size returned by g_socket_control_message_get_size() on this object.


def size : UInt64 #

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