CODEWITHSUNDEEP
socketsnetwork-programmingtcpip
plang
plang

Reputation: 5656

SOCK_SEQPACKET availability?

When using a raw TCP socket, there is a need for doing message framing, as explained here, either with a length prefix, or with delimiters.

I came accross the "SOCK_SEQPACKET" socket option today, which could apparently do the message framing almost transparently.

What is the availability of "SOCK_SEQPACKET" amongst platforms and OSes at the moment? (Windows, OSX, Linux, IOS, Android...)

Upvotes: 9

Views: 4583

Answers (3)

mattes
mattes

Reputation: 9429

Linux: available since version 2.6.4

Mac OS: not available (better source?)

Windows: not available

Upvotes: 0

Ales Teska
Ales Teska

Reputation: 1288

SCTP is still not available on Mac OS X (El Captain). There is a 3rd party open-source kernel extension at https://github.com/sctplab/SCTP_NKE_ElCapitan - But it is unsigned, therefore you have to disable Apple System Integrity Protection.

See e.g. https://apple.stackexchange.com/questions/114217/sctp-kernel-extension-for-mavericks

Equally, you cannot use SOCK_SEQPACKET with AF_UNIX on Mac OS X too.

Upvotes: 1

SKi
SKi

Reputation: 8466

I you uses SOCK_SEQPACKET of AF_INET, this way:

socket(AF_INET, SOCK_SEQPACKET, 0);

You won't get a TCP socket. The socket will be a SCTP socket, if your platform supports it.

SCTP is not yet widely used. Latest Linux versions supports it (if SCTP is enabled).

There are some libraries also for Windows.

Upvotes: 8

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