commit fff356786f8a3a98c5c29f12bb7e59e6d98076a9
author Pierre Imai <imaipi@google.com> Mon Apr 18 11:42:14 2016 +0900
committer Pierre Imai <imaipi@google.com> Thu Apr 21 10:07:24 2016 +0900
tree 809df27c4f19294876b13a9b2583fdddc8e4b79d
parent bd26f23c84c6c3a1179a9bf9cca4b5e2941bf042

Store DNS server count in resolv_cache.

Instead of keeping a sentinel after nameservers[], nsaddrinfo[] and
nstats[], store the server count in the structure, freeing up memory and
eliminating the need to enumerate the server count every time
_resolv_is_nameservers_equal_locked() is invoked.

Also increase MAXNS from 3 to 4.

BUG: 28153323
Change-Id: I11a7257af695157c9e32019cd00c67b535b63c75

libc/dns/resolv/res_send.c

diff --git a/libc/dns/resolv/res_send.c b/libc/dns/resolv/res_send.c
index 9ceeeb7..bfc6e1a 100644
--- a/libc/dns/resolv/res_send.c
+++ b/libc/dns/resolv/res_send.c
@@ -488,10 +488,10 @@
 	 * Send request, RETRY times, or until successful.
 	 */
 	for (try = 0; try < statp->retry; try++) {
-	    struct __res_stats stats[MAXNS + 1];
+	    struct __res_stats stats[MAXNS];
 	    struct __res_params params;
 	    int revision_id = _resolv_cache_get_resolver_stats(statp->netid, &params, stats);
-	    bool usable_servers[MAXNS + 1];
+	    bool usable_servers[MAXNS];
 	    _res_stats_get_usable_servers(&params, stats, statp->nscount, usable_servers);
 
 	    for (ns = 0; ns < statp->nscount; ns++) {