## GUnixConnection

GUnixConnection — A UNIX domain GSocketConnection

## Functions

gint | g_unix_connection_receive_fd ()
gboolean | g_unix_connection_send_fd ()
GCredentials * | g_unix_connection_receive_credentials ()
void | g_unix_connection_receive_credentials_async ()
GCredentials * | g_unix_connection_receive_credentials_finish ()
gboolean | g_unix_connection_send_credentials ()
void | g_unix_connection_send_credentials_async ()
gboolean | g_unix_connection_send_credentials_finish ()

## Types and Values

struct | GUnixConnection

## Object Hierarchy

        GObject
        ╰── GIOStream
            ╰── GSocketConnection
                ╰── GUnixConnection

## Includes

    #include <gio/gunixconnection.h>

## Description

This is the subclass of GSocketConnection that is created for UNIX domain sockets.

It contains functions to do some of the UNIX socket specific functionality like passing file descriptors.

Note that `<gio/gunixconnection.h>` belongs to the UNIX-specific GIO interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config file when using it.

## Functions

### g_unix_connection_receive_fd ()

    gint
    g_unix_connection_receive_fd (GUnixConnection *connection,
                                  GCancellable *cancellable,
                                  GError **error);

Receives a file descriptor from the sending end of the connection. The sending end has to call `g_unix_connection_send_fd()` for this to work.

As well as reading the fd this also reads a single byte from the stream, as this is required for fd passing to work on some implementations.

#### Parameters

connection | a GUnixConnection |
cancellable | optional GCancellable object, `NULL` to ignore. | [nullable]
error | GError for error reporting, or `NULL` to ignore. | [nullable]

#### Returns

a file descriptor on success, -1 on error.

Since: 2.22

### g_unix_connection_send_fd ()

    gboolean
    g_unix_connection_send_fd (GUnixConnection *connection,
                               gint fd,
                               GCancellable *cancellable,
                               GError **error);

Passes a file descriptor to the receiving side of the connection. The receiving end has to call `g_unix_connection_receive_fd()` to accept the file descriptor.

As well as sending the fd this also writes a single byte to the stream, as this is required for fd passing to work on some implementations.

#### Parameters

connection | a GUnixConnection |
fd | a file descriptor |
cancellable | optional GCancellable object, `NULL` to ignore. | [nullable]
error | GError for error reporting, or `NULL` to ignore. | [nullable]

#### Returns

a `TRUE` on success, `NULL` on error.

Since: 2.22

### g_unix_connection_receive_credentials ()

    GCredentials *
    g_unix_connection_receive_credentials (GUnixConnection *connection,
                                           GCancellable *cancellable,
                                           GError **error);

Receives credentials from the sending end of the connection. The sending end has to call `g_unix_connection_send_credentials()` (or similar) for this to work.

As well as reading the credentials this also reads (and discards) a single byte from the stream, as this is required for credentials passing to work on some implementations.

This method can be expected to be available on the following platforms:

- Linux since GLib 2.26

- FreeBSD since GLib 2.26

- GNU/kFreeBSD since GLib 2.36

- Solaris, Illumos and OpenSolaris since GLib 2.40

- GNU/Hurd since GLib 2.40

Other ways to exchange credentials with a foreign peer includes the GUnixCredentialsMessage type and `g_socket_get_credentials()` function.

#### Parameters

connection | A GUnixConnection. |
cancellable | A GCancellable or `NULL`. | [nullable]
error | Return location for error or `NULL`. |

#### Returns

Received credentials on success (free with `g_object_unref()`), `NULL` if `error` is set.

[transfer full]

Since: 2.26

### g_unix_connection_receive_credentials_async ()

    void
    g_unix_connection_receive_credentials_async
                                   (GUnixConnection *connection,
                                    GCancellable *cancellable,
                                    GAsyncReadyCallback callback,
                                    gpointer user_data);

Asynchronously receive credentials.

For more details, see `g_unix_connection_receive_credentials()` which is the synchronous version of this call.

When the operation is finished, `callback` will be called. You can then call `g_unix_connection_receive_credentials_finish()` to get the result of the operation.

#### Parameters

connection | A GUnixConnection. |
cancellable | optional GCancellable object, `NULL` to ignore. | [nullable]
callback | a GAsyncReadyCallback to call when the request is satisfied. | [scope async]
user_data | the data to pass to callback function. | [closure]

Since: 2.32

### g_unix_connection_receive_credentials_finish ()

    GCredentials *
    g_unix_connection_receive_credentials_finish
                                   (GUnixConnection *connection,
                                    GAsyncResult *result,
                                    GError **error);

Finishes an asynchronous receive credentials operation started with `g_unix_connection_receive_credentials_async()`.

#### Parameters

connection | A GUnixConnection. |
result | a GAsyncResult. |
error | a GError, or `NULL` |

#### Returns

a GCredentials, or `NULL` on error. Free the returned object with `g_object_unref()`.

[transfer full]

Since: 2.32

### g_unix_connection_send_credentials ()

    gboolean
    g_unix_connection_send_credentials (GUnixConnection *connection,
                                        GCancellable *cancellable,
                                        GError **error);

Passes the credentials of the current user the receiving side of the connection. The receiving end has to call `g_unix_connection_receive_credentials()` (or similar) to accept the credentials.

As well as sending the credentials this also writes a single NUL byte to the stream, as this is required for credentials passing to work on some implementations.

This method can be expected to be available on the following platforms:

- Linux since GLib 2.26

- FreeBSD since GLib 2.26

- GNU/kFreeBSD since GLib 2.36

- Solaris, Illumos and OpenSolaris since GLib 2.40

- GNU/Hurd since GLib 2.40

Other ways to exchange credentials with a foreign peer includes the GUnixCredentialsMessage type and `g_socket_get_credentials()` function.

#### Parameters

connection | A GUnixConnection. |
cancellable | A GCancellable or `NULL`. | [nullable]
error | Return location for error or `NULL`. |

#### Returns

`TRUE` on success, `FALSE` if `error` is set.

Since: 2.26

### g_unix_connection_send_credentials_async ()

    void
    g_unix_connection_send_credentials_async
                                   (GUnixConnection *connection,
                                    GCancellable *cancellable,
                                    GAsyncReadyCallback callback,
                                    gpointer user_data);

Asynchronously send credentials.

For more details, see `g_unix_connection_send_credentials()` which is the synchronous version of this call.

When the operation is finished, `callback` will be called. You can then call `g_unix_connection_send_credentials_finish()` to get the result of the operation.

#### Parameters

connection | A GUnixConnection. |
cancellable | optional GCancellable object, `NULL` to ignore. | [nullable]
callback | a GAsyncReadyCallback to call when the request is satisfied. | [scope async]
user_data | the data to pass to callback function. | [closure]

Since: 2.32

### g_unix_connection_send_credentials_finish ()

    gboolean
    g_unix_connection_send_credentials_finish
                                   (GUnixConnection *connection,
                                    GAsyncResult *result,
                                    GError **error);

Finishes an asynchronous send credentials operation started with `g_unix_connection_send_credentials_async()`.

#### Parameters

connection | A GUnixConnection. |
result | a GAsyncResult. |
error | a GError, or `NULL` |

#### Returns

`TRUE` if the operation was successful, otherwise `FALSE`.

Since: 2.32

## Types and Values

### struct GUnixConnection

    struct GUnixConnection;

GUnixConnection is an opaque data structure and can only be accessed using the following functions.

## See Also

GSocketConnection.