From 6ed189b4128157920d1ea059eefce60ad82eee37 Mon Sep 17 00:00:00 2001
From: klzgrad <kizdiv@gmail.com>
Date: Sat, 30 Nov 2019 22:21:18 +0800
Subject: [PATCH] dns: Support Musl

---
 src/net/dns/dns_reloader.cc            | 14 +++++++++++++-
 src/net/dns/public/scoped_res_state.cc |  6 +++---
 src/net/dns/public/scoped_res_state.h  |  2 +-
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/net/dns/dns_reloader.cc b/src/net/dns/dns_reloader.cc
index bfd2de11f9..657a034501 100644
--- a/src/net/dns/dns_reloader.cc
+++ b/src/net/dns/dns_reloader.cc
@@ -64,20 +64,32 @@ class DnsReloader : public NetworkChangeNotifier::DNSObserver {
     if (!reload_state) {
       auto new_reload_state = std::make_unique<ReloadState>();
       new_reload_state->resolver_generation = resolver_generation_;
+#ifdef __MUSL__
+      res_init();
+#else
       res_ninit(&_res);
+#endif
       tls_reload_state_.Set(std::move(new_reload_state));
     } else if (reload_state->resolver_generation != resolver_generation_) {
       reload_state->resolver_generation = resolver_generation_;
       // It is safe to call res_nclose here since we know res_ninit will have
       // been called above.
+#ifdef __MUSL__
+      res_init();
+#else
       res_nclose(&_res);
       res_ninit(&_res);
+#endif
     }
   }
 
  private:
   struct ReloadState {
-    ~ReloadState() { res_nclose(&_res); }
+    ~ReloadState() {
+#ifndef __MUSL__
+      res_nclose(&_res);
+#endif
+    }
 
     int resolver_generation;
   };
diff --git a/src/net/dns/public/scoped_res_state.cc b/src/net/dns/public/scoped_res_state.cc
index 2743697bf6..f8bef3e377 100644
--- a/src/net/dns/public/scoped_res_state.cc
+++ b/src/net/dns/public/scoped_res_state.cc
@@ -13,7 +13,7 @@
 namespace net {
 
 ScopedResState::ScopedResState() {
-#if BUILDFLAG(IS_OPENBSD) || BUILDFLAG(IS_FUCHSIA)
+#if BUILDFLAG(IS_OPENBSD) || BUILDFLAG(IS_FUCHSIA) || defined(__MUSL__)
   // Note: res_ninit in glibc always returns 0 and sets RES_INIT.
   // res_init behaves the same way.
   memset(&_res, 0, sizeof(_res));
@@ -25,7 +25,7 @@ ScopedResState::ScopedResState() {
 }
 
 ScopedResState::~ScopedResState() {
-#if !BUILDFLAG(IS_OPENBSD) && !BUILDFLAG(IS_FUCHSIA)
+#if !BUILDFLAG(IS_OPENBSD) && !BUILDFLAG(IS_FUCHSIA) && !defined(__MUSL__)
 
   // Prefer res_ndestroy where available.
 #if BUILDFLAG(IS_APPLE) || BUILDFLAG(IS_FREEBSD)
@@ -43,7 +43,7 @@ bool ScopedResState::IsValid() const {
 
 const struct __res_state& ScopedResState::state() const {
   DCHECK(IsValid());
-#if BUILDFLAG(IS_OPENBSD) || BUILDFLAG(IS_FUCHSIA)
+#if BUILDFLAG(IS_OPENBSD) || BUILDFLAG(IS_FUCHSIA) || defined(__MUSL__)
   return _res;
 #else
   return res_;
diff --git a/src/net/dns/public/scoped_res_state.h b/src/net/dns/public/scoped_res_state.h
index c979c75727..fe0dffbdf5 100644
--- a/src/net/dns/public/scoped_res_state.h
+++ b/src/net/dns/public/scoped_res_state.h
@@ -31,7 +31,7 @@ class NET_EXPORT ScopedResState {
   virtual const struct __res_state& state() const;
 
  private:
-#if !BUILDFLAG(IS_OPENBSD) && !BUILDFLAG(IS_FUCHSIA)
+#if !BUILDFLAG(IS_OPENBSD) && !BUILDFLAG(IS_FUCHSIA) && !defined(__MUSL__)
   struct __res_state res_;
 #endif  // !BUILDFLAG(IS_OPENBSD) && !BUILDFLAG(IS_FUCHSIA)