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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...)
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In the UNIX domain, the SOCK_STREAM socket type works like a pipe. In the Internet domain, the SOCK_STREAM socket type is implemented on the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol.
Seqpacket. 5. Provides connection-oriented and reliable two-way transfer of ordered byte streams across a network. Seqpacket does not duplicate data, and it preserves boundaries within the data stream.
Sequenced Packet Sockets (SPS)It allows the user to modify the SP Protocols header on a packet or a group of packets, either by writing a prototype header along whatever data is to be sent or by specifying a default header to be used with all outgoing data.
Network sockets need support from an underlying protocol such as TCP (Transmission Control Protocol) or the lower-level UDP (User Datagram Protocol). By contrast, IPC sockets rely upon the local system kernel to support communication; in particular, IPC sockets communicate using a local file as a socket address.
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.
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