The Design and Implementation of the Anykernel and Rump Kernels

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RUMP_COMPONENT(RUMP_COMPONENT_NET)
{
DOMAINADD(inetdomain);
}
[ omitted: attach other domains ]
RUMP_COMPONENT(RUMP_COMPONENT_NET_IFCFG)
{
[ omitted: local variables ]
if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, curlwp, NULL)) != 0)
panic("lo0 config: cannot create socket");
/* configure 127.0.0.1 for lo0 */
memset(&ia, 0, sizeof(ia));
strcpy(ia.ifra_name, "lo0");
sin = (struct sockaddr_in *)&ia.ifra_addr;
sin->sin_family = AF_INET;
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_addr.s_addr = inet_addr("127.0.0.1");
[ omitted: define lo0 netmask and broadcast address ]
}
in_control(so, SIOCAIFADDR, &ia, lo0ifp, curlwp);
soclose(so);
Figure 3.20: Example: selected contents of component.c for netinet. The
inet domain is attached in one constructor. The presence of the domain is required
for configuring an inet address for lo0. The interface itself is provided and created
by the net component (not shown).