holger <holger...@freyther.de> added the comment:

Could you please tell me which exact posix document and paragraph says that?

In Linux sending can fail but once sendmsg worked the message is enqueued on 
the other socket 
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/unix/af_unix.c?id=110af3acb8cfd79dcb5676a01e07cb2b6afa4c04#n1626).

In FreeBSD 
(http://fxr.watson.org/fxr/source/kern/uipc_usrreq.c?v=FREEBSD10#L911) it looks 
similar. If the mbuf can't be put into the recvq of the remote socket.. an 
error will be returned.

What about SEQPACKET support?

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