sendFd
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.
Return
a true on success, null on error.
Since
2.22
Parameters
fd
a file descriptor
cancellable
optional #GCancellable object, null to ignore.