8234805: (dc) Remove JNI upcall from DatagramChannel.receive implementation

Reviewed-by: dfuchs, chegar

src/java.base/share/native/libnio/ch/NativeSocketAddress.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2019, 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 "jni.h"
+ #include "net_util.h"
+
+ #include "sun_nio_ch_NativeSocketAddress.h"
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_AFINET(JNIEnv* env, jclass clazz)
+ {
+     return AF_INET;
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_AFINET6(JNIEnv* env, jclass clazz)
+ {
+     return AF_INET6;
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_sizeofSOCKETADDRESS(JNIEnv* env, jclass clazz)
+ {
+     return sizeof(SOCKETADDRESS);
+ }
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_NativeSocketAddress_sizeofFamily(JNIEnv* env, jclass clazz)
+{
+    // sizeof(struct sockaddr, sa_family)
+    return sizeof(((struct sockaddr *)0)->sa_family);
+}
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetFamily(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr, sa_family);
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetSin4Port(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr_in, sin_port);
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetSin4Addr(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr_in, sin_addr);
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetSin6Port(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr_in6, sin6_port);
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetSin6Addr(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr_in6, sin6_addr);
+ }
+
+ JNIEXPORT jint JNICALL
+ Java_sun_nio_ch_NativeSocketAddress_offsetSin6ScopeId(JNIEnv* env, jclass clazz)
+ {
+     return offsetof(struct sockaddr_in6, sin6_scope_id);
+ }