Function zvariant::to_bytes_fds_for_signature

pub fn to_bytes_fds_for_signature<B, T: ?Sized>(
    ctxt: EncodingContext<B>, 
    signature: &Signature<'_>, 
    value: &T
) -> Result<(Vec<u8>, Vec<RawFd>)> where
    B: ByteOrder,
    T: Serialize, 

Serialize T that (potentially) contains FDs and has the given signature, to a new byte vector.

Use this function instead of to_bytes_fds if the value being serialized does not implement Type.

Please note that the serialized bytes only contain the indices of the file descriptors from the returned file descriptor vector, which needs to be transferred via an out-of-band platform specific mechanism.