Update from Google.
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MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/lib/util/OsUtils.java b/src/main/java/com/google/devtools/build/lib/util/OsUtils.java
new file mode 100644
index 0000000..fa12f59
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/util/OsUtils.java
@@ -0,0 +1,74 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.
+
+package com.google.devtools.build.lib.util;
+
+import com.google.devtools.build.lib.vfs.PathFragment;
+
+/**
+ * Operating system-specific utilities.
+ */
+public final class OsUtils {
+
+ private static final String EXECUTABLE_EXTENSION = OS.getCurrent() == OS.WINDOWS ? ".exe" : "";
+
+ // Utility class.
+ private OsUtils() {
+ }
+
+ /**
+ * Returns the extension used for executables on the current platform (.exe
+ * for Windows, empty string for others).
+ */
+ public static String executableExtension() {
+ return EXECUTABLE_EXTENSION;
+ }
+
+ /**
+ * Loads JNI libraries, if necessary under the current platform.
+ */
+ public static void maybeForceJNI(PathFragment installBase) {
+ if (jniLibsAvailable()) {
+ forceJNI(installBase);
+ }
+ }
+
+ private static boolean jniLibsAvailable() {
+ // JNI libraries work fine on Windows, but at the moment we are not using any.
+ return OS.getCurrent() != OS.WINDOWS;
+ }
+
+ // Force JNI linking at a moment when we have 'installBase' handy, and print
+ // an informative error if it fails.
+ private static void forceJNI(PathFragment installBase) {
+ try {
+ ProcessUtils.getpid(); // force JNI initialization
+ } catch (UnsatisfiedLinkError t) {
+ System.err.println("JNI initialization failed: " + t.getMessage() + ". "
+ + "Possibly your installation has been corrupted; "
+ + "if this problem persists, try 'rm -fr " + installBase + "'.");
+ throw t;
+ }
+ }
+
+ /**
+ * Returns the PID of the current process, or -1 if not available.
+ */
+ public static int getpid() {
+ if (jniLibsAvailable()) {
+ return ProcessUtils.getpid();
+ }
+ return -1;
+ }
+}
