glibmm: Gio::UnixFDList Class Reference

glibmm 2.32.1

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Gio::UnixFDList Class Reference
Portable Network I/O Functionality

UnixFDList - An object containing a set of UNIX file descriptors. More...

`#include <giomm/unixfdlist.h>`

Inheritance diagram for Gio::UnixFDList:
[legend]

List of all members.

## Public Member Functions
virtual | ~UnixFDList ()
GUnixFDList* | gobj ()
| Provides access to the underlying C GObject.
const GUnixFDList* | gobj () const
| Provides access to the underlying C GObject.
GUnixFDList* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
int | get_length () const
| Gets the length of list (ie: the number of file descriptors contained within).
int | get (int index) const
| Gets a file descriptor out of list.
const Glib::ArrayHandle< int > | peek_fds () const
| Returns the array of file descriptors that is contained in this object.
Glib::ArrayHandle< int > | steal_fds ()
| Returns the array of file descriptors that is contained in this object.
int | append (int fd)
| Adds a file descriptor to list.
Public Member Functions inherited from Glib::Object
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
void | set_property_value (const Glib::ustring& property_name, const Glib::ValueBase&value)
| You probably want to use a specific property_*() accessor method instead.
void | get_property_value (const Glib::ustring& property_name, Glib::ValueBase&value) const
| You probably want to use a specific property_*() accessor method instead.
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.
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.
void | 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, but this is necessary when using the reduced API.
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead, but this is necessary when using the reduced API.
void | freeze_notify ()
| Increases the freeze count on object.
void | thaw_notify ()
| Reverts the effect of a previous call to freeze_notify().
virtual void | reference () const
| Increment the reference count for this object.
virtual void | unreference () const
| Decrement the reference count for this object.
GObject* | gobj_copy () const
| Give a ref-ed copy to someone. Use for direct struct access.
Public Member Functions inherited from sigc::trackable
| trackable (const trackable &src)
trackable & | operator= (const trackable &src)
void | add_destroy_notify_callback (void *data, func_destroy_notify func) const
void | remove_destroy_notify_callback (void *data) const
void | notify_callbacks ()

## Static Public Member Functions
static Glib::RefPtr< UnixFDList > | create ()
| Creates a new UnixFDList containing no file descriptors.
static Glib::RefPtr< UnixFDList > | create (const Glib::ArrayHandle< int >& fds)
| Creates a new UnixFDList containing the file descriptors given in fds.
static Glib::RefPtr< UnixFDList > | create (const Glib::ArrayHandle< int >& fds, int n_fds)
| Creates a new UnixFDList containing the file descriptors given in fds.

## Protected Member Functions
| UnixFDList ()
| UnixFDList (const Glib::ArrayHandle< int >& fds)
| UnixFDList (const Glib::ArrayHandle< int >& fds, int n_fds)
Protected Member Functions inherited from Glib::Object
| Object ()
| Object (const Glib::ConstructParams& construct_params)
| Object (GObject* castitem)
virtual | ~Object ()
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.
| ObjectBase (const char* custom_type_name)
| A derived constructor always overrides this choice.
| 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.
virtual | ~ObjectBase ()=0
void | initialize (GObject* castitem)

## Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gio::UnixFDList > | wrap (GUnixFDList* object, bool take_copy=false)
| A Glib::wrap() method for this object.
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
typedef void(* | DestroyNotify )(gpointer data)

## Detailed Description

UnixFDList - An object containing a set of UNIX file descriptors.

A UnixFDList contains a list of file descriptors. It owns the file descriptors that it contains, closing them when finalized.

It may be wrapped in a UnixFDMessage and sent over a Socket in the G_SOCKET_ADDRESS_UNIX family by using Gio::Socket::send() and received using Gio::Socket::receive().

Since glibmm 2.28:

## Constructor & Destructor Documentation

virtual Gio::UnixFDList::~UnixFDList | ( |  | ) |
| virtual

Gio::UnixFDList::UnixFDList | ( |  | ) |
| protected

Gio::UnixFDList::UnixFDList | ( | const Glib::ArrayHandle< int >& | fds | ) |
| explicitprotected

Gio::UnixFDList::UnixFDList | ( | const Glib::ArrayHandle< int >& | fds,
|  | int | n_fds
| ) |  |
| explicitprotected

## Member Function Documentation

int Gio::UnixFDList::append | ( | int | fd | ) |

Adds a file descriptor to list.

The file descriptor is duplicated using dup(). You keep your copy of the descriptor and the copy contained in list will be closed when list is finalized.

A possible cause of failure is exceeding the per-process or system-wide file descriptor limit.

The index of the file descriptor in the list is returned. If you use this index with g_unix_fd_list_get() then you will receive back a duplicated copy of the same file descriptor.

Since glibmm 2.24:

Parameters:

  fd | A valid open file descriptor.

Returns:
  The index of the appended fd in case of success, else -1 (and error is set).

Exceptions:

  Glib::Error. |

static Glib::RefPtr<UnixFDList> Gio::UnixFDList::create | ( |  | ) |
| static

Creates a new UnixFDList containing no file descriptors.

Since glibmm 2.24:

Returns:
  A new UnixFDList.

static Glib::RefPtr<UnixFDList> Gio::UnixFDList::create | ( | const Glib::ArrayHandle< int >& | fds | ) |
| static

Creates a new UnixFDList containing the file descriptors given in fds.

The file descriptors become the property of the new list and may no longer be used by the caller. The array itself is owned by the caller.

Each file descriptor in the array should be set to close-on-exec.

Parameters:

  fds | The list of file descriptors to use for creation.

Returns:
  A new UnixFDList.

static Glib::RefPtr<UnixFDList> Gio::UnixFDList::create | ( | const Glib::ArrayHandle< int >& | fds,
|  | int | n_fds
| ) |  |
| static

Creates a new UnixFDList containing the file descriptors given in fds.

The file descriptors become the property of the new list and may no longer be used by the caller. The array itself is owned by the caller.

Each file descriptor in the array should be set to close-on-exec.

If n_fds is -1 then fds must be terminated with -1.

Since glibmm 2.24:

Parameters:

  fds | The initial list of file descriptors.
  n_fds | The length of #fds, or -1.

Returns:
  A new UnixFDList.

int Gio::UnixFDList::get | ( | int | index | ) | const

Gets a file descriptor out of list.

index specifies the index of the file descriptor to get. It is a programmer error for index to be out of range; see g_unix_fd_list_get_length().

The file descriptor is duplicated using dup() and set as close-on-exec before being returned. You must call close() on it when you are done.

A possible cause of failure is exceeding the per-process or system-wide file descriptor limit.

Since glibmm 2.24:

Parameters:

  index | The index into the list.

Returns:
  The file descriptor, or -1 in case of error.

int Gio::UnixFDList::get_length | ( |  | ) | const

Gets the length of list (ie: the number of file descriptors contained within).

Since glibmm 2.24:

Returns:
  The length of list.

GUnixFDList* Gio::UnixFDList::gobj | ( |  | ) |
| inline

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

const GUnixFDList* Gio::UnixFDList::gobj | ( |  | ) | const
| inline

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

GUnixFDList* Gio::UnixFDList::gobj_copy | ( |  | ) |

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

const Glib::ArrayHandle<int> Gio::UnixFDList::peek_fds | ( |  | ) | const

Returns the array of file descriptors that is contained in this object.

After this call, the descriptors remain the property of the list. The caller must not close them. The array is valid only until list is changed in any way.

Returns:
  The list of file descriptors.

Since glibmm 2.28:

Glib::ArrayHandle<int> Gio::UnixFDList::steal_fds | ( |  | ) |

Returns the array of file descriptors that is contained in this object.

After this call, the descriptors are no longer contained in the list. Further calls will return an empty list (unless more descriptors have been added).

The caller is responsible for closing all of the file descriptors. The file descriptors in the array are set to close-on-exec.

Returns:
  The list of file descriptors.

Since glibmm 2.28:

## Friends And Related Function Documentation

Glib::RefPtr< Gio::UnixFDList > wrap | ( | GUnixFDList * | object,
|  | bool | take_copy = `false`
| ) |  |
| related

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.