Author: kp
Date: Thu May 7 21:14:11 2020
New Revision: 360799
URL: https://svnweb.freebsd.org/changeset/base/360799
Log:
MFC r360231:
libc: Shortcut if_indextoname() if index == 0
If the index we're trying to convert is 0 we can avoid a potentially
expensive call to getifaddrs(). No interface has an ifindex of zero, so
we can handle this as an error: set the errno to ENXIO and return NULL.
Submitted by: Nick Rogers
Sponsored by: RG Nets
Modified:
stable/12/lib/libc/net/if_indextoname.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/lib/libc/net/if_indextoname.c
==============================================================================
--- stable/12/lib/libc/net/if_indextoname.c Thu May 7 20:29:38 2020
(r360798)
+++ stable/12/lib/libc/net/if_indextoname.c Thu May 7 21:14:11 2020
(r360799)
@@ -66,6 +66,11 @@ if_indextoname(unsigned int ifindex, char *ifname)
struct ifaddrs *ifaddrs, *ifa;
int error = 0;
+ if (ifindex == 0) {
+ errno = ENXIO;
+ return(NULL);
+ }
+
if (getifaddrs(&ifaddrs) < 0)
return(NULL); /* getifaddrs properly set errno */
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