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Document alternative calling convention for IP_MULTICAST_IF.

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This commit is contained in:
dyoung 2005-12-12 07:20:38 +00:00
parent ad14f15c1d
commit a012374f4d
1 changed files with 13 additions and 2 deletions
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15
share/man/man4/ip.4
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@ -1,4 +1,4 @@
.\" $NetBSD: ip.4,v 1.16 2003/09/07 16:22:28 wiz Exp $
.\" $NetBSD: ip.4,v 1.17 2005/12/12 07:20:38 dyoung Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -205,7 +205,18 @@ be obtained via the
and
.Dv SIOCGIFFLAGS
ioctls.
Normal applications should not need to use this option.
An application may also specify an alternative to the default network interface
by index:
.Bd -literal
struct uint32_t idx = htonl(ifindex);
setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, \*[Am]idx, sizeof(idx));
.Ed
.Pp
where "ifindex" is an interface index as returned by
.Xr if_nametoindex 4 .
.Pp
Normal applications should not need to use
.Dv IP_MULTICAST_IF .
.Pp
If a multicast datagram is sent to a group to which the sending host itself
belongs (on the outgoing interface), a copy of the datagram is, by default,