commit 97c9d73a8787e3d8e0a4a4b3445fc5d71f0eb222
author Pierre Imai <imaipi@google.com> Mon Apr 18 12:00:12 2016 +0900
committer Pierre Imai <imaipi@google.com> Thu Apr 21 10:07:26 2016 +0900
tree f7cbbc05cb74a82d714116ac921b9aa37a41282e
parent fff356786f8a3a98c5c29f12bb7e59e6d98076a9

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

libc/dns/resolv/res_stats.c

diff --git a/libc/dns/resolv/res_stats.c b/libc/dns/resolv/res_stats.c
index 5cc592e..99c79e4 100644
--- a/libc/dns/resolv/res_stats.c
+++ b/libc/dns/resolv/res_stats.c
@@ -54,8 +54,8 @@
 
 /* Aggregates the reachability statistics for the given server based on on the stored samples. */
 void
-_res_stats_aggregate(struct __res_stats* stats, int* successes, int* errors, int* timeouts,
-             int* internal_errors, int* rtt_avg, time_t* last_sample_time)
+android_net_res_stats_aggregate(struct __res_stats* stats, int* successes, int* errors,
+        int* timeouts, int* internal_errors, int* rtt_avg, time_t* last_sample_time)
 {
     int s = 0;   // successes
     int e = 0;   // errors
@@ -123,8 +123,8 @@
     int internal_errors = -1;
     int rtt_avg = -1;
     time_t last_sample_time = 0;
-    _res_stats_aggregate(stats, &successes, &errors, &timeouts, &internal_errors, &rtt_avg,
-            &last_sample_time);
+    android_net_res_stats_aggregate(stats, &successes, &errors, &timeouts, &internal_errors,
+            &rtt_avg, &last_sample_time);
     if (successes >= 0 && errors >= 0 && timeouts >= 0) {
         int total = successes + errors + timeouts;
         if (DBG) {
@@ -164,8 +164,8 @@
 }
 
 void
-_res_stats_get_usable_servers(const struct __res_params* params, struct __res_stats stats[],
-        int nscount, bool usable_servers[]) {
+android_net_res_stats_get_usable_servers(const struct __res_params* params,
+        struct __res_stats stats[], int nscount, bool usable_servers[]) {
     unsigned usable_servers_found = 0;
     for (int ns = 0; ns < nscount; ns++) {
         bool usable = _res_stats_usable_server(params, &stats[ns]);