Add new info functions to resolver for use by Netd.
android_net_res_stats_get_info_for_net returns the current name servers, search
domains, parameters and stats for the given network ID.
android_net_res_stats_aggregate provides statistics such as errors counts from
the raw stats data reported by android_net_res_stats_get_info_for_net.
android_net_res_stats_get_usable_servers uses the data returned by
android_net_res_stats_aggregate to determine which of the servers are
considered valid or broken by the resolver.
BUG: 25731675
Change-Id: I6059b68e5e8b809027a4d3135f6081588bee8a7d
diff --git a/libc/dns/include/resolv_params.h b/libc/dns/include/resolv_params.h
index f6948c0..5ee265f 100644
--- a/libc/dns/include/resolv_params.h
+++ b/libc/dns/include/resolv_params.h
@@ -20,8 +20,10 @@
#include <stdint.h>
/* Hard-coded defines */
-#define MAXNS 4 /* max # name servers we'll track */
-#define MAXNSSAMPLES 64 /* max # samples to store per server */
+#define MAXNS 4 /* max # name servers we'll track */
+#define MAXDNSRCH 6 /* max # domains in search path */
+#define MAXDNSRCHPATH 256 /* max length of domain search paths */
+#define MAXNSSAMPLES 64 /* max # samples to store per server */
/* Defaults used for initializing __res_params */
#define SUCCESS_THRESHOLD 75 /* if successes * 100 / total_samples is less than