glibmm: Gio::SocketControlMessage Class Reference

A Socket control message. More...

#include <giomm/socketcontrolmessage.h>

Inheritance diagram for Gio::SocketControlMessage:

[legend]

Public Member Functions
	SocketControlMessage (SocketControlMessage&& src) noexcept

SocketControlMessage&	operator= (SocketControlMessage&& src) noexcept

	~SocketControlMessage () noexcept override

GSocketControlMessage*	gobj ()
	Provides access to the underlying C GObject. More...

const GSocketControlMessage*	gobj () const
	Provides access to the underlying C GObject. More...

GSocketControlMessage*	gobj_copy ()
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...

int	get_level () const
	Returns the "level" (i.e. the originating protocol) of the control message. More...

int	get_msg_type () const
	Returns the protocol specific type of the control message. More...

gsize	get_size () const
	Returns the space required for the control message, not including headers or alignment. More...

void	serialize (gpointer data)
	Converts the data in the message to bytes placed in the message. More...

Public Member Functions inherited from Glib::Object
	Object (const Object&)=delete

Object&	operator= (const Object&)=delete

	Object (Object&& src) noexcept

Object&	operator= (Object&& src) noexcept

void*	get_data (const QueryQuark& key)

void	set_data (const Quark& key, void* data)

void	set_data (const Quark& key, void* data, DestroyNotify notify)

void	remove_data (const QueryQuark& quark)

void*	steal_data (const QueryQuark& quark)

Public Member Functions inherited from Glib::ObjectBase
	ObjectBase (const ObjectBase&)=delete

ObjectBase&	operator= (const ObjectBase&)=delete

void	set_property_value (const Glib::ustring& property_name, const Glib::ValueBase& value)
	You probably want to use a specific property_*() accessor method instead. More...

void	get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const
	You probably want to use a specific property_*() accessor method instead. More...

template<class PropertyType >
void	set_property (const Glib::ustring& property_name, const PropertyType& value)
	You probably want to use a specific property_*() accessor method instead. More...

template<class PropertyType >
void	get_property (const Glib::ustring& property_name, PropertyType& value) const
	You probably want to use a specific property_*() accessor method instead. More...

template<class PropertyType >
PropertyType	get_property (const Glib::ustring& property_name) const
	You probably want to use a specific property_*() accessor method instead. More...

sigc::connection	connect_property_changed (const Glib::ustring& property_name, const sigc::slot< void()>& slot)
	You can use the signal_changed() signal of the property proxy instead. More...

sigc::connection	connect_property_changed (const Glib::ustring& property_name, sigc::slot< void()>&& slot)
	You can use the signal_changed() signal of the property proxy instead. More...

void	freeze_notify ()
	Increases the freeze count on object. More...

void	thaw_notify ()
	Reverts the effect of a previous call to freeze_notify(). More...

virtual void	reference () const
	Increment the reference count for this object. More...

virtual void	unreference () const
	Decrement the reference count for this object. More...

GObject*	gobj ()
	Provides access to the underlying C GObject. More...

const GObject*	gobj () const
	Provides access to the underlying C GObject. More...

GObject*	gobj_copy () const
	Give a ref-ed copy to someone. Use for direct struct access. More...

Public Member Functions inherited from sigc::trackable
	trackable () noexcept

	trackable (const trackable &src) noexcept

	trackable (trackable &&src) noexcept

	~trackable ()

void	add_destroy_notify_callback (notifiable *data, func_destroy_notify func) const

void	notify_callbacks ()

trackable &	operator= (const trackable &src)

trackable &	operator= (trackable &&src) noexcept

void	remove_destroy_notify_callback (notifiable *data) const

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system. More...

static Glib::RefPtr< SocketControlMessage >	deserialize (int level, int type, gsize size, gpointer data)
	Tries to deserialize a socket control message of a given level and type. More...

Protected Types
using	DeserializeFunc = Glib::RefPtr< SocketControlMessage >(*)(int level, int type, gsize size, gpointer data)
	Pointer to a function that can be called from deserialize() or g_socket_control_message_deserialize(). More...

Protected Member Functions
	SocketControlMessage ()

virtual gsize	get_size_vfunc () const

virtual int	get_level_vfunc () const

virtual int	get_type_vfunc () const

virtual void	serialize_vfunc (gpointer data)

Protected Member Functions inherited from Glib::Object
	Object ()

	Object (const Glib::ConstructParams& construct_params)

	Object (GObject* castitem)

	~Object () noexcept override

Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()
	This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor. More...

	ObjectBase (const char* custom_type_name)
	A derived constructor always overrides this choice. More...

	ObjectBase (const std::type_info& custom_type_info)
	This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually. More...

	ObjectBase (ObjectBase&& src) noexcept

ObjectBase&	operator= (ObjectBase&& src) noexcept

virtual	~ObjectBase () noexcept=0

void	initialize (GObject* castitem)

void	initialize_move (GObject* castitem, Glib::ObjectBase* previous_wrapper)

Static Protected Member Functions
static void	add_deserialize_func (DeserializeFunc func)
	Register a deserialize function. More...

Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gio::SocketControlMessage >	wrap (GSocketControlMessage* object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Related Functions inherited from Glib::Object
Glib::RefPtr< Glib::Object >	wrap (GObject* object, bool take_copy=false)

Additional Inherited Members
Public Types inherited from Glib::Object
using	DestroyNotify = void(*)(gpointer data)

Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify	func_destroy_notify

Public Types inherited from sigc::notifiable
typedef internal::func_destroy_notify	func_destroy_notify

Detailed Description

A Socket control message.

A SocketControlMessage is a special-purpose utility message that can be sent to or received from a 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 Gio::Socket::send() and received with Gio::Socket::receive().

To extend the set of control message that can be sent, subclass this class and override the get_size_vfunc(), get_level_vfunc(), get_type_vfunc() and serialize_vfunc() methods.

To extend the set of control messages that can be received, subclass this class and implement a DeserializeFunc function. Typically it would be a static class method. Also, make sure you register the DeserializeFunc function with a call to add_deserialize_func() before calling Gio::Socket::receive() to read such a message.

Since glibmm 2.28:

Member Typedef Documentation

using Gio::SocketControlMessage::DeserializeFunc = Glib::RefPtr<SocketControlMessage> (*) (int level, int type, gsize size, gpointer data)

protected

Pointer to a function that can be called from deserialize() or g_socket_control_message_deserialize().

For instance,

Glib::RefPtr<SocketControlMessage> my_deserialize_func(

int level, int type, gsize size, gpointer data);

Parameters

level	A socket level.
type	A socket control message type for the given level.
size	The size of the data in bytes.
data	Pointer to the message data (element-type guint8).

Returns: The deserialized message or an empty Glib::RefPtr. The returned message can be a subclass of SocketControlMessage.

Constructor & Destructor Documentation

Gio::SocketControlMessage::SocketControlMessage ( SocketControlMessage&& src )

noexcept

Gio::SocketControlMessage::~SocketControlMessage ( )

overridenoexcept

Gio::SocketControlMessage::SocketControlMessage ( )

protected

Member Function Documentation

static void Gio::SocketControlMessage::add_deserialize_func ( DeserializeFunc func )

staticprotected

If the same function is registered multiple times, only the first registration has an effect.

In GLib, deserialize() is a class virtual function (not associated with an instance). Such functions don't exist in C++. A function registered with add_deserialize_func() is a kind of replacement.

static Glib::RefPtr<SocketControlMessage> Gio::SocketControlMessage::deserialize	(	int	level,
		int	type,
		gsize	size,
		gpointer	data
	)

static

Tries to deserialize a socket control message of a given level and type.

This will ask all known (to GType) subclasses of SocketControlMessage if they can understand this kind of message and if so deserialize it into a SocketControlMessage.

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

Since glibmm 2.22:

Parameters

level	A socket level.
type	A socket control message type for the given level.
size	The size of the data in bytes.
data	Pointer to the message data.

Returns: The deserialized message or nullptr.

int Gio::SocketControlMessage::get_level ( ) const

Returns the "level" (i.e. the originating protocol) of the control message.

This is often SOL_SOCKET.

Since glibmm 2.22:

Returns: An integer describing the level.

virtual int Gio::SocketControlMessage::get_level_vfunc ( ) const

protectedvirtual

int Gio::SocketControlMessage::get_msg_type ( ) const

Returns the protocol specific type of the control message.

For instance, for UNIX fd passing this would be SCM_RIGHTS.

Since glibmm 2.22:

Returns: An integer describing the type of control message.

gsize Gio::SocketControlMessage::get_size ( ) const

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

Since glibmm 2.22:

Returns: The number of bytes required.

virtual gsize Gio::SocketControlMessage::get_size_vfunc ( ) const

protectedvirtual

static GType Gio::SocketControlMessage::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

virtual int Gio::SocketControlMessage::get_type_vfunc ( ) const

protectedvirtual

GSocketControlMessage* Gio::SocketControlMessage::gobj ( )

inline

Provides access to the underlying C GObject.

const GSocketControlMessage* Gio::SocketControlMessage::gobj ( ) const

inline

Provides access to the underlying C GObject.

GSocketControlMessage* Gio::SocketControlMessage::gobj_copy ( )

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

SocketControlMessage& Gio::SocketControlMessage::operator= ( SocketControlMessage&& src )

noexcept

void Gio::SocketControlMessage::serialize ( gpointer data )

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.

Since glibmm 2.22:

Parameters

data	A buffer to write data to.

virtual void Gio::SocketControlMessage::serialize_vfunc ( gpointer data )

protectedvirtual

Friends And Related Function Documentation

Glib::RefPtr< Gio::SocketControlMessage > wrap	(	GSocketControlMessage *	object,
		bool	take_copy = `false`
	)

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns: A C++ instance that wraps this C instance.

glibmm: Gio::SocketControlMessage Class Reference

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Related Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation