On 1/29/20 12:14 AM, Milo Turner wrote:
Hello all,

I'm wondering if it's possible to open a unix domain socket with SOCK_SEQPACKET in Racket? It looks like currently unix-socket-lib uses SOCK_STREAM, and doesn't allow you to configure that flag. Is there a reason for this, or would it be a good idea to add this feature to the unix-socket-lib library? I would rather not issue the C FFI calls myself, because non-blocking IO is fairly difficult to do correctly from my previous impressions with it.

SOCK_SEQPACKET sockets don't match Racket's port interface, which doesn't have a notion of message boundaries, so you'd have to work around that interface mismatch. Also, the unix-socket library reuses Racket's implementation of ports backed by file descriptors. To support SOCK_SEQPACKET, it would need a different implementation of read and write that preserved message boundaries.

So it would be possible, but it's a fair amount of work, and no one seems to have really needed SOCK_SEQPACKET support yet.


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