David Schwartz wrote:
>
> The Linux operating system stores more in those buffers than other
> operating systems do. So if we just passed along the size unmodified, people
> would wind up with, effectively, smaller buffers than they expected.
>
> DS
>
> > hi,
> >
> > I do not understand why setting SO_SNDBUF with
> >
> > res = BUFSIZE;
> > err = setsockopt(s, SOL_SOCKET, SO_SNDBUF, &res, len);
> >
> > actually sets the buffer size to 2*BUFSIZE. What is the reason for that?
> >
> > The corresponding code fragment is in sock.c, int sock_setsockopt(...
... so then we should maybe change sock_getsockopt to:
case SO_SNDBUF:
v.val=sk->sndbuf/2;
break;
case SO_RCVBUF:
v.val =sk->rcvbuf/2;
break;
because I would expect following behaviour:
err = getsockopt(s, SOL_SOCKET, SO_SNDBUF, &res1, &len);
err = setsockopt(s, SOL_SOCKET, SO_SNDBUF, &res1, len);
err = getsockopt(s, SOL_SOCKET, SO_SNDBUF, &res2, &len);
after that sequence, res1 should be == res2 !
Am I totally wrong?
Reto
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