From df3fd62f7f0c51c11e7f715c2523418c31eb6b0f Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 7 Jul 2017 15:27:50 -0700
Subject: [PATCH 10/12] Define res_ninit and res_nclose for non-glibc platforms

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 net/dns/dns_config_service_posix.cc |  4 ++++
 net/dns/dns_reloader.cc             |  4 ++++
 net/dns/resolv_compat.h             | 29 +++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 net/dns/resolv_compat.h

diff --git a/net/dns/dns_config_service_posix.cc b/net/dns/dns_config_service_posix.cc
index ba8a36913..e9b40d07f 100644
--- a/net/dns/dns_config_service_posix.cc
+++ b/net/dns/dns_config_service_posix.cc
@@ -25,6 +25,10 @@
 #include "net/dns/notify_watcher_mac.h"
 #include "net/dns/serial_worker.h"
 
+#if defined(OS_LINUX) && !defined(__GLIBC__)
+#include "net/dns/resolv_compat.h"
+#endif
+
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 #include "net/dns/dns_config_watcher_mac.h"
 #endif
diff --git a/net/dns/dns_reloader.cc b/net/dns/dns_reloader.cc
index 74534e6b1..2780a776e 100644
--- a/net/dns/dns_reloader.cc
+++ b/net/dns/dns_reloader.cc
@@ -9,6 +9,10 @@
 
 #include <resolv.h>
 
+#if defined(OS_LINUX) && !defined(__GLIBC__)
+#include "net/dns/resolv_compat.h"
+#endif
+
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
diff --git a/net/dns/resolv_compat.h b/net/dns/resolv_compat.h
new file mode 100644
index 000000000..4f0e852a1
--- /dev/null
+++ b/net/dns/resolv_compat.h
@@ -0,0 +1,29 @@
+#if !defined(__GLIBC__)
+/***************************************************************************
+ * resolv_compat.h
+ *
+ * Mimick GLIBC's res_ninit() and res_nclose() for musl libc
+ * Note: res_init() is actually deprecated according to
+ * http://docs.oracle.com/cd/E36784_01/html/E36875/res-nclose-3resolv.html
+ **************************************************************************/
+#include <string.h>
+
+static inline int res_ninit(res_state statp)
+{
+	int rc = res_init();
+	if (statp != &_res) {
+		memcpy(statp, &_res, sizeof(*statp));
+	}
+	return rc;
+}
+
+static inline int res_nclose(res_state statp)
+{
+	if (!statp)
+		return -1;
+	if (statp != &_res) {
+		memset(statp, 0, sizeof(*statp));
+	}
+	return 0;
+}
+#endif
-- 
2.13.2