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Date:	Fri, 4 Sep 2009 17:09:04 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: missing ipi_spec_dst in struct in_pktinfo
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On Fri, Sep 04, 2009 at 04:10:24PM -0400, Schulman DOT Andrew AT epamail DOT epa DOT 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?  ip(7) says that "If ... 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."  This suggests that I could replace
>it by zero.  Comments?

The structure isn't used by cygwin in any way so it sounds like you
could replace it with whatever you want.

cgf

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