Date: Sun, 19 Oct 1997 14:32:34 -0400 From: "Gregory D Moncreaff" <moncrg@ma.ultranet.com> To: "Hackers FreeBSD" <hackers@freebsd.org>, "Terry Lambert" <tlambert@primenet.com> Subject: Re: [Q] Is recvmsg for ancillary (control) data part of protocol or generic sockets? Message-ID: <01bcdcbd$5e351cc0$a8647392@moncrg>
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-----Original Message-----
From: Terry Lambert <tlambert@primenet.com>
To: Gregory D Moncreaff <moncrg@ma.ultranet.com>
Cc: hackers@FreeBSD.ORG <hackers@FreeBSD.ORG>
Date: Friday, October 17, 1997 4:00 PM
Subject: Re: [Q] Is recvmsg for ancillary (control) data part of protocol or
generic sockets?
>> was looking at design and implementation 4.4 and
>> there was a PRU_RECV, PRU_RECVOOB but no
>> PRU_RECVCTL.
>>
>> just wondering how the control data gets from the
>> protocol to the user....
>
>man recvmsg.
>
>The control and data parts are retrieved simultaneously.
>
>
> Terry Lambert
> terry@lambert.org
>---
>Any opinions in this posting are my own and not those of my present
>or previous employers.
>
I eventually found the code in kern/uipc_socket.c:soreceive()
There seems to be a problem with connection oriented protocols getting
disconnect data since
soreceive checks PR_CONNREQUIRED and aborts before checking to see if
control data is
present.
Is this by accident or design? PR_CONNREQUIRED is only supposed to gate
send according to sys/protosw.h...
if (m == 0 || (( .....
.....
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
(so->so_proto->pr_flags & PR_CONNREQUIRED)) {
error = ENOTCONN;
goto release;
.....
while (m && m->m_type == MT_CONTROL && error == 0) {
if (flags & MSG_PEEK) {
if (controlp)
*controlp = m_copy(m, 0, m->m_len);
m = m->m_next;
.....
release:
sbunlock(&so->so_rcv);
splx(s);
return (error);
=====================================================================
Gregory D. Moncreaff Phone 1-508-490-2048
Raytheon Electronic Systems Fax 1-508-490-2086
Gregory_D_Moncreaff@res.raytheon.com Home moncrg@ma.ultranet.com
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