## GUnixConnection

GUnixConnection — A UNIX domain GSocketConnection

## Synopsis

    #include <gio/gunixconnection.h>

                        GUnixConnection;
    gint                g_unix_connection_receive_fd        (GUnixConnection *connection,
                                                             GCancellable *cancellable,
                                                             GError **error);
    gboolean            g_unix_connection_send_fd           (GUnixConnection *connection,
                                                             gint fd,
                                                             GCancellable *cancellable,
                                                             GError **error);
    GCredentials *      g_unix_connection_receive_credentials
                                                            (GUnixConnection *connection,
                                                             GCancellable *cancellable,
                                                             GError **error);
    gboolean            g_unix_connection_send_credentials  (GUnixConnection *connection,
                                                             GCancellable *cancellable,
                                                             GError **error);

## Object Hierarchy

      GObject
       +----GIOStream
             +----GSocketConnection
                   +----GUnixConnection

## 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.

## Details

### GUnixConnection

    typedef struct _GUnixConnection GUnixConnection;

### 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.

`connection` : | a GUnixConnection
`cancellable` : | optional GCancellable object, `NULL` to ignore. [allow-none]
`error` : | GError for error reporting, or `NULL` to ignore. [allow-none]
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 recieving side of the connection. The recieving 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.

`connection` : | a GUnixConnection
`fd` : | a file descriptor
`cancellable` : | optional GCancellable object, `NULL` to ignore. [allow-none]
`error` : | GError for error reporting, or `NULL` to ignore. [allow-none]
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.

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

`connection` : | A GUnixConnection.
`cancellable` : | A GCancellable or `NULL`.
`error` : | Return location for error or `NULL`.
Returns : | Received credentials on success (free with `g_object_unref()`), `NULL` if `error` is set.

Since 2.26

### 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 recieving 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.

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

`connection` : | A GUnixConnection.
`cancellable` : | A GCancellable or `NULL`.
`error` : | Return location for error or `NULL`.
Returns : | `TRUE` on success, `FALSE` if `error` is set.

Since 2.26

## See Also

GSocketConnection.