From 5d5e89261bb49a5c882891a53fe4b735ef452e94 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 13 Feb 2019 09:51:14 -0800
Subject: [PATCH] provide res_ninit and nclose APIs on non-glibc linux
 platforms

These APIs are not implemented on musl

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/net/dns/dns_config_service_linux.cc
+++ b/net/dns/dns_config_service_linux.cc
@@ -414,12 +414,6 @@ class DnsConfigServiceLinux::ConfigReade
     base::ScopedBlockingCall scoped_blocking_call(
         FROM_HERE, base::BlockingType::MAY_BLOCK);
 
-    std::unique_ptr<struct __res_state> res = resolv_reader_->GetResState();
-    if (res) {
-      dns_config_ = ConvertResStateToDnsConfig(*res.get());
-      resolv_reader_->CloseResState(res.get());
-    }
-
     UMA_HISTOGRAM_BOOLEAN("Net.DNS.DnsConfig.Resolv.Read",
                           dns_config_.has_value());
     if (!dns_config_.has_value())
--- a/net/dns/dns_reloader.cc
+++ b/net/dns/dns_reloader.cc
@@ -4,9 +4,8 @@
 
 #include "net/dns/dns_reloader.h"
 
-#if defined(OS_POSIX) && !defined(OS_APPLE) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID) && !defined(OS_FUCHSIA)
-
+#if defined(__GLIBC__)
+
 #include <resolv.h>
 
 #include "base/lazy_instance.h"
--- a/net/dns/host_resolver_manager.cc
+++ b/net/dns/host_resolver_manager.cc
@@ -2902,8 +2902,7 @@ HostResolverManager::HostResolverManager
   NetworkChangeNotifier::AddConnectionTypeObserver(this);
   if (system_dns_config_notifier_)
     system_dns_config_notifier_->AddObserver(this);
-#if defined(OS_POSIX) && !defined(OS_APPLE) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID)
+#if defined(__GLIBC__)
   EnsureDnsReloaderInit();
 #endif
 
--- a/net/dns/host_resolver_proc.cc
+++ b/net/dns/host_resolver_proc.cc
@@ -176,8 +176,7 @@ int SystemHostResolverCall(const std::st
   base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
                                                 base::BlockingType::WILL_BLOCK);
 
-#if defined(OS_POSIX) && !defined(OS_APPLE) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID) && !defined(OS_FUCHSIA)
+#if defined(__GLIBC__)
   DnsReloaderMaybeReload();
 #endif
   absl::optional<AddressInfo> ai;
--- a/net/dns/public/resolv_reader.cc
+++ b/net/dns/public/resolv_reader.cc
@@ -20,19 +20,10 @@
 namespace net {
 
 std::unique_ptr<struct __res_state> ResolvReader::GetResState() {
-  auto res = std::make_unique<struct __res_state>();
-  memset(res.get(), 0, sizeof(struct __res_state));
-
-  if (res_ninit(res.get()) != 0) {
-    CloseResState(res.get());
-    return nullptr;
-  }
-
-  return res;
+  return nullptr;
 }
 
 void ResolvReader::CloseResState(struct __res_state* res) {
-  res_nclose(res);
 }
 
 absl::optional<std::vector<IPEndPoint>> GetNameservers(