/*
 * Copyright 2011 The Android Open Source Project
 *
 * 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 android.security.cts;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

/**
 * Utilities for accessing /proc filesystem information.
 */
public class Proc {
    public static int findPidFor(String executable) throws IOException {
        File f = new File("/proc");
        for (File d : f.listFiles()) {
            String cmdLineString = d.getAbsolutePath() + "/cmdline";
            File cmdLine = new File(cmdLineString);
            if (cmdLine.exists()) {
                BufferedReader in = null;
                try {
                    in = new BufferedReader(new FileReader(cmdLine));
                    String line = in.readLine();
                    if ((line != null) && line.startsWith(executable)) {
                        return Integer.decode(d.getName());
                    }
                } finally {
                    if (in != null) {
                        in.close();
                    }
                }
            }
        }
        throw new RuntimeException("should never get here");
    }
}