Description This GSocketControlMessage contains a GUnixFDList. It may be sent using g_socket_send_message() and received using g_socket_receive_message() over UNIX sockets (ie: sockets in the G_SOCKET_ADDRESS_UNIX family). The file descriptors are copied between processes by the kernel. For an easier way to send and receive file descriptors over stream-oriented UNIX sockets, see g_unix_connection_send_fd() and g_unix_connection_receive_fd(). Note that <gio/gunixfdmessage.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.