--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.net/macosx/native/libextnet/MacOSXSocketOptions.c	Wed May 30 16:36:35 2018 +0530
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+#include <sys/socket.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <jni.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include "jni_util.h"
+
+static jint socketOptionSupported(jint sockopt) {
+    jint one = 1;
+    jint rv, s;
+    s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (s < 0) {
+        return 0;
+    }
+    rv = setsockopt(s, IPPROTO_TCP, sockopt, (void *) &one, sizeof (one));
+    if (rv != 0 && errno == ENOPROTOOPT) {
+        rv = 0;
+    } else {
+        rv = 1;
+    }
+    close(s);
+    return rv;
+}
+
+static void handleError(JNIEnv *env, jint rv, const char *errmsg) {
+    if (rv < 0) {
+        if (errno == ENOPROTOOPT) {
+            JNU_ThrowByName(env, "java/lang/UnsupportedOperationException",
+                    "unsupported socket option");
+        } else {
+            JNU_ThrowByNameWithLastError(env, "java/net/SocketException", errmsg);
+        }
+    }
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    keepAliveOptionsSupported0
+ * Signature: ()Z
+ */
+JNIEXPORT jboolean JNICALL Java_jdk_net_MacOSXSocketOptions_keepAliveOptionsSupported0
+(JNIEnv *env, jobject unused) {
+    return socketOptionSupported(TCP_KEEPALIVE) && socketOptionSupported(TCP_KEEPCNT)
+            && socketOptionSupported(TCP_KEEPINTVL);
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    setTcpkeepAliveProbes0
+ * Signature: (II)V
+ */
+JNIEXPORT void JNICALL Java_jdk_net_MacOSXSocketOptions_setTcpkeepAliveProbes0
+(JNIEnv *env, jobject unused, jint fd, jint optval) {
+    jint rv = setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &optval, sizeof (optval));
+    handleError(env, rv, "set option TCP_KEEPCNT failed");
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    setTcpKeepAliveTime0
+ * Signature: (II)V
+ */
+JNIEXPORT void JNICALL Java_jdk_net_MacOSXSocketOptions_setTcpKeepAliveTime0
+(JNIEnv *env, jobject unused, jint fd, jint optval) {
+    jint rv = setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &optval, sizeof (optval));
+    handleError(env, rv, "set option TCP_KEEPALIVE failed");// mac TCP_KEEPIDLE ->TCP_KEEPALIVE
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    setTcpKeepAliveIntvl0
+ * Signature: (II)V
+ */
+JNIEXPORT void JNICALL Java_jdk_net_MacOSXSocketOptions_setTcpKeepAliveIntvl0
+(JNIEnv *env, jobject unused, jint fd, jint optval) {
+    jint rv = setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &optval, sizeof (optval));
+    handleError(env, rv, "set option TCP_KEEPINTVL failed");
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    getTcpkeepAliveProbes0
+ * Signature: (I)I;
+ */
+JNIEXPORT jint JNICALL Java_jdk_net_MacOSXSocketOptions_getTcpkeepAliveProbes0
+(JNIEnv *env, jobject unused, jint fd) {
+    jint optval, rv;
+    socklen_t sz = sizeof (optval);
+    rv = getsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &optval, &sz);
+    handleError(env, rv, "get option TCP_KEEPCNT failed");
+    return optval;
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    getTcpKeepAliveTime0
+ * Signature: (I)I;
+ */
+JNIEXPORT jint JNICALL Java_jdk_net_MacOSXSocketOptions_getTcpKeepAliveTime0
+(JNIEnv *env, jobject unused, jint fd) {
+    jint optval, rv;
+    socklen_t sz = sizeof (optval);
+    rv = getsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &optval, &sz);
+    handleError(env, rv, "get option TCP_KEEPALIVE failed");// mac TCP_KEEPIDLE ->TCP_KEEPALIVE
+    return optval;
+}
+
+/*
+ * Class:     jdk_net_MacOSXSocketOptions
+ * Method:    getTcpKeepAliveIntvl0
+ * Signature: (I)I;
+ */
+JNIEXPORT jint JNICALL Java_jdk_net_MacOSXSocketOptions_getTcpKeepAliveIntvl0
+(JNIEnv *env, jobject unused, jint fd) {
+    jint optval, rv;
+    socklen_t sz = sizeof (optval);
+    rv = getsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &optval, &sz);
+    handleError(env, rv, "get option TCP_KEEPINTVL failed");
+    return optval;
+}