scheme_fd_to_semphore Not Implemented

[Ray Racine]

Making the switch to the CS version and ran into one small issue.

My low level Bluetooth socket packet leveraged the Inside Racket C API scheme_fd_to_semaphore function.  Currently I am getting a "Not implemented" message.  A search of Racket docs still finds it, however, it appears to be dropped in the IO runtime changes.

Is there a new equivalent API call I can leverage?

Code is here: https://gitlab.com/RayRacine/bluetooth-socket/blob/master/socket/bt-socket-ffi.rkt

It is a small standalone file.

The following reproduces the issue.

bt-socket-ffi.rkt> (define s (socket AF_BLUETOOTH SOCK_RAW BTPROTO_HCI
bt-socket-ffi.rkt> (scheme_fd_to_semaphore s 1 #t)
; scheme_fd_to_semaphore: implementation not found; arguments: 12 1 #t

[Matthew Flatt]

Use `ffi/unsafe/port`.

In general, things that we used to leave to the C API should have
counterparts as `ffi/unsafe/...` libraries. Several are in place,
although I doubt that we've covered everything that will turn out to be
useful.

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