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// Copyright 2014 The Bazel Authors. 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;
}
}
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