pub fn to_writer_fds_for_signature<B, W, T: ?Sized>(
writer: &mut W,
) -> Result<(usize, Vec<RawFd>)> where
W: Write + Seek,
T that (potentially) contains FDs and has the given signature, to the given
This function returns the number of bytes written to the given
writer and the file descriptor
vector, which needs to be transferred via an out-of-band platform specific mechanism.