SO_SNDTIMEO SO_RCVTIMEO[2.4.x]

[hiro]

setsockopt option, SO_SNDTIMEO and SO_RCVTIMEO implemented?
in linux/net/core/sock.c sock_setsockopt follow

                case SO_RCVTIMEO:
                        ret = sock_set_timeout(&sk->rcvtimeo, optval,
optlen);
                        break;

                case SO_SNDTIMEO:
                        ret = sock_set_timeout(&sk->sndtimeo, optval,
optlen);
                        break;

timeval is setting socket buffer
but man 7 socket is ...

       SO_RCVTIMEO and SO_SNDTIMEO
              Specify the sending or receiving timeouts until reporting
anerror.   They  are
              fixed  to  a  protocol  specific setting in Linux and cannotbe
read or written.
              Their functionality can be emulated using alarm(2) or
setitimer(2).

man 7 scoket told me socket timeout can't change!!
Which is ture?

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