This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: missing ipi_spec_dst in struct in_pktinfo
On Sep 4 16:10, Schulman.Andrew@epamail.epa.gov wrote:
>
> I'm trying to build socat for Cygwin (1.7). The build fails with
>
> xio-ip.c:480: error: structure has no member named `ipi_spec_dst'
>
> The offending code wants to use pktinfo->ipi_spec_dst.s_addr, where
> pktinfo is a struct in_pktinfo *. The problem is that in Cygwin,
> in_pktinfo doesn't have an ipi_spec_dst member. 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.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple