> All you are showing us Neil is that the documentation
> is inaccurate. That snippet you showed me from manual
> pages is wrong about sendmsg semantics.
Yes, it's wrong I agree. Here is a patch. Please check
and if nobody complains Andries can apply.
>
> The ifindex you specify does mean "send out this interface".
>
> It is very surprising that this documentation is wrong since
> the likely author (Andi Kleen) is smart enough to read the
> actual implementation when he writes these things.
There was no serious technical review of these manpages ever, so
I wouldn't be surprised if there are more such technical errors (hint ;)
-Andi
--- ip.7~ 2003-02-19 08:50:48.000000000 +0100
+++ ip.7 2003-02-19 09:09:36.000000000 +0100
@@ -260,12 +260,16 @@
.I IP_PKTINFO
is passed to
.BR sendmsg (2)
-then the outgoing packet will be sent over the interface
-specified in
-.B ipi_ifindex
-with the destination address set to
+and
+.\" This field is grossly misnamed
.B ipi_spec_dst
-.
+is not zero then it is used as the local source address for the routing
+table lookup and for setting up IP source route options.
+When
+.B ipi_ifindex
+is not zero the primary local address of the interface specified by the index overwrites
+.I ipi_spec_dst
+for the routing table lookup.
.TP
.B IP_RECVTOS
-
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