You can create wires manually in addition to the
package’s interface creating them for you. To create a wire, you need
a Unix file descriptor. If you are unfamiliar with Unix file
descriptors, see section 2 of the Unix manual pages.
make-wire creates a new wire when supplied with
the file descriptor to use for the underlying I/O operations.
This function returns
t if object is indeed a wire,
This function returns the file descriptor used by the wire.