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// 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.concurrent.ThreadSafety.ThreadSafe;
/**
* OS Process related utilities.
*
* <p>Default implementation forwards all requests to
* {@link com.google.devtools.build.lib.unix.ProcessUtils}. The default implementation
* can be overridden by {@code #setImplementation(ProcessUtilsImpl)} method.
*/
@ThreadSafe
public final class ProcessUtils {
/**
* Describes implementation to which all {@code ProcessUtils} requests are
* forwarded.
*/
public interface ProcessUtilsImpl {
/** @see ProcessUtils#getgid() */
int getgid();
/** @see ProcessUtils#getpid() */
int getpid();
/** @see ProcessUtils#getuid() */
int getuid();
}
private volatile static ProcessUtilsImpl implementation = new ProcessUtilsImpl() {
@Override
public int getgid() {
return com.google.devtools.build.lib.unix.ProcessUtils.getgid();
}
@Override
public int getpid() {
return com.google.devtools.build.lib.unix.ProcessUtils.getpid();
}
@Override
public int getuid() {
return com.google.devtools.build.lib.unix.ProcessUtils.getuid();
}
};
private ProcessUtils() {
// prevent construction.
}
/**
* @return the real group ID of the current process.
*/
public static int getgid() {
return implementation.getgid();
}
/**
* @return the process ID of this process.
*/
public static int getpid() {
return implementation.getpid();
}
/**
* @return the real user ID of the current process.
*/
public static int getuid() {
return implementation.getuid();
}
}
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