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Re: missing ipi_spec_dst in struct in_pktinfo
> > The IP man page
> > (http://homepages.cwi.nl/~aeb/linux/man2html/man7/ip.7.html) lists
> > in_pktinfo as
> >
> > struct in_pktinfo {
> > unsigned int ipi_ifindex; /* Interface index */
> > struct in_addr ipi_spec_dst; /* Local address */
> > struct in_addr ipi_addr; /* Header Destination address */
> > };
> >
> > while in /usr/include/cygwin/in.h, it's just
> >
> > struct in_pktinfo
> > {
> > struct in_addr ipi_addr;
> > uint32_t ipi_ifindex;
> > };
> >
> > Any suggestions for a workaround to this problem? Why is ipi_spec_dst
> > missing, and more to the point, what can/should I substitute in its
> > place?
>
> ipi_spec_dst is missing because the Winsock structure in_pktinfo is
> defined without this field. The recvmsg function will return the
> Winsock equivalent to this structure, since that's how it gets it from
> Windows. The workaround is easy: Don't use that field. Disable the code
> in socat which uses it. Even if we would go to great lengths to
> add/remove the field when calling WSASendMsg/WSARecvMsg, it would be
> entirely meaningless anyway.
OK, thanks to you both. It turns out that socat only uses that field for
reporting in one place, so I disabled it as you suggested. socat is great,
I'll be packaging it for Cygwin shortly. A.
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