This documents the error code when passing multiple cmsg structs. Let me know if the wording needs to be improved.
Index: lib/libc/sys/send.2 =================================================================== RCS file: /cvs/src/lib/libc/sys/send.2,v retrieving revision 1.31 diff -u -p -r1.31 send.2 --- lib/libc/sys/send.2 9 Sep 2014 06:32:37 -0000 1.31 +++ lib/libc/sys/send.2 16 Apr 2015 12:48:32 -0000 @@ -223,6 +223,17 @@ values in the .Fa msg_iov array overflowed an .Em ssize_t . +.It Bq Er EINVAL +The socket +.Fa s +is a +.Xr unix 4 +socket, and +.Em controlmsg +is an invalid size or multiple +.Em controlmsg +structures were passed as part of +.Fa msg . .It Bq Er EMSGSIZE The .Fa msg_iovlen
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