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missing ipi_spec_dst in struct in_pktinfo
- From: Schulman dot Andrew at epamail dot epa dot gov
- To: cygwin at cygwin dot com
- Date: Fri, 4 Sep 2009 16:10:24 -0400
- Subject: missing ipi_spec_dst in struct in_pktinfo
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?
Thanks,
Andrew.
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