JRE-394 added regression test (System getenv doesn't return env var set in JNI code)

(cherry picked from commit 3a7b3c67b0)

test/jdk/jb/java/lang/System/SetEnv394.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2000-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+
+
+/* @test
+ * @library ../../../lib/jna.jar
+ * @summary regression test on JRE-394. Actuall behaviour is to cache env on runtime classes loading
+ * @run main/othervm SetEnv394
+ */
+
+public class SetEnv394 {
+
+    // Inside the Environment class...
+    public interface WinLibC extends Library {
+        int _putenv(String name);
+    }
+
+    public interface LinuxLibC extends Library {
+        int setenv(String name, String value, int overwrite);
+    }
+
+    static public class POSIX {
+        static Object libc;
+
+        static {
+            if (System.getProperty("os.name").contains("Linux"))
+                libc = Native.loadLibrary("c", SetEnv394.LinuxLibC.class);
+
+            else if (System.getProperty("os.name").contains("Mac OS X"))
+                libc = Native.loadLibrary("c", SetEnv394.LinuxLibC.class);
+
+            else if (System.getProperty("os.name").contains("Windows"))
+                libc = Native.loadLibrary("msvcrt", SetEnv394.WinLibC.class);
+
+            else
+                throw new RuntimeException("Unsupported OS: " + System.getProperty("os.name"));
+        }
+
+        int setenv(String name, String value, int overwrite) {
+            if (libc instanceof SetEnv394.LinuxLibC) {
+                return ((SetEnv394.LinuxLibC) libc).setenv(name, value, overwrite);
+            } else {
+                return ((SetEnv394.WinLibC) libc)._putenv(name + "=" + value);
+            }
+        }
+    }
+
+    private static SetEnv394.POSIX libc = new SetEnv394.POSIX();
+
+    private static final String ENV_VARIABLE = "V_394";
+    private static final String ENV_VALUE = "VALUE394";
+
+    public static void main(String[] args) {
+        System.getenv(ENV_VARIABLE); // Cache environment variables
+        System.out.println("Setting env variable");
+
+        int result = libc.setenv(ENV_VARIABLE, ENV_VALUE, 1);
+        if (result != 0)
+            throw new RuntimeException("Setting was unsuccessful. Result: " + result);
+
+        String setActualValue = System.getenv(ENV_VARIABLE);
+        if (setActualValue != null)
+            throw new RuntimeException("Actual value of the varibale \'" + ENV_VARIABLE + "\' is \'" + setActualValue
+                    + "\', expecting null");
+    }
+}