Just saw a few suggestions in docker talk at gophercon 2014:
https://cdn.rawgit.com/gophercon/2014-talks/master/Making_Docker_GO_victor_vieux_gophercon2014.pdf.

--
The syscall package isn’t perfect: 
– sendmsg() wrapper missing return value 
– RecvMsg doesn’t pass MSG_CMSG_CLOEXEC
--

The former is fixed in issue #7645, the latter might be metioning ReadMsg{IP,UDP,Unix}
methods in the net package. Perhaps adding ReadMsg/WriteMsg with platform agnostic
control message flags might make sense for people who must work with AF_LOCAL/AF_UNIX
with ancillary data deeply.

A dumb API sketch:

type MsgFlags int
const (
        MsgFlagOOB = MsgFlags = 1<< iota
        ...
        MsgFlagCloseOnExec
)

func (c *TCPConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, rdflags MsgFlags,
addr Addr, err error)
func (c *UDPConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, rdflags MsgFlags,
addr Addr, err error)
func (c *IPConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, rdflags MsgFlags,
addr Addr, err error)
func (c *UnixConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, rdflags
MsgFlags, addr Addr, err error)

func (c *TCPConn) WriteMsg(b, oob []byte, flags MsgFlags) (n, oobn int, err error)
func (c *UDPConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, err error)
func (c *IPConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, err error)
func (c *UnixConn) ReadMsg(b, oob []byte, flags MsgFlags) (n, oobn int, err error)