commit 5ef42896e22a5f4d1d2fc6cd8f4e6d981c1fef05
from: Stefan Sperling <stsp@stsp.name>
date: Tue Mar 07 22:44:02 2023 UTC

initialize ifp in show_vnet_parent()

I am not sure how this ever worked without providing the desired
interface name in the ioctl request.

commit - 3e900a0e4ce20da82f78e6b5b2ab520729e3e62c
commit + 5ef42896e22a5f4d1d2fc6cd8f4e6d981c1fef05
blob - ff37c8bb238a7c157908dcaf8a18acf7bd72bfc7
blob + 6c89a10ac613f10be4fad6c9f1e1c1555b8e824f
--- if.c
+++ if.c
@@ -636,9 +636,10 @@ show_vnet_parent(int ifs, char *ifname)
 
 	bzero(&ifr, sizeof(ifr));
 	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
-
 	if (ioctl(ifs, SIOCGVNETID, (caddr_t)&ifr) != -1)
 		printf(" vnetid %llu,", ifr.ifr_vnetid);
+	bzero(&ifp, sizeof(ifp));
+	strlcpy(ifp.ifp_name, ifname, sizeof(ifp.ifp_name));
 	if (ioctl(ifs, SIOCGIFPARENT, (caddr_t)&ifp) != -1)
 		printf(" parent %s,", ifp.ifp_parent);
 }