// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License. Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
//
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.naming.ConfigurationException;
import org.apache.log4j.Logger;
import com.cloud.utils.PropertiesUtil;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.script.OutputInterpreter;
import com.cloud.utils.script.Script;
import java.util.Properties;
public class ProcessUtil {
private static final Logger s_logger = Logger.getLogger(ProcessUtil.class.getName());
// paths cannot be hardcoded
public static void pidCheck(String pidDir, String run) throws ConfigurationException {
String dir = pidDir==null?"/var/run":pidDir;
try {
final File propsFile = PropertiesUtil.findConfigFile("environment.properties");
if (propsFile == null) {
s_logger.debug("environment.properties could not be opened");
}
else {
final FileInputStream finputstream = new FileInputStream(propsFile);
final Properties props = new Properties();
props.load(finputstream);
finputstream.close();
dir = props.getProperty("paths.pid");
if (dir == null) {
dir = "/var/run";
}
}
} catch (IOException e) {
s_logger.debug("environment.properties could not be opened");
}
final File pidFile = new File(dir + File.separator + run);
try {
if (!pidFile.createNewFile()) {
if (!pidFile.exists()) {
throw new ConfigurationException("Unable to write to " + pidFile.getAbsolutePath() + ". Are you sure you're running as root?");
}
final FileInputStream is = new FileInputStream(pidFile);
final BufferedReader reader = new BufferedReader(new InputStreamReader(is));
final String pidLine = reader.readLine();
if (pidLine == null) {
throw new ConfigurationException("Java process is being started twice. If this is not true, remove " + pidFile.getAbsolutePath());
}
try {
final long pid = Long.parseLong(pidLine);
final Script script = new Script("bash", 120000, s_logger);
script.add("-c", "ps -p " + pid);
final String result = script.execute();
if (result == null) {
throw new ConfigurationException("Java process is being started twice. If this is not true, remove " + pidFile.getAbsolutePath());
}
if (!pidFile.delete()) {
throw new ConfigurationException("Java process is being started twice. If this is not true, remove " + pidFile.getAbsolutePath());
}
if (!pidFile.createNewFile()) {
throw new ConfigurationException("Java process is being started twice. If this is not true, remove " + pidFile.getAbsolutePath());
}
} catch (final NumberFormatException e) {
throw new ConfigurationException("Java process is being started twice. If this is not true, remove " + pidFile.getAbsolutePath());
}
}
pidFile.deleteOnExit();
final Script script = new Script("bash", 120000, s_logger);
script.add("-c", "echo $PPID");
final OutputInterpreter.OneLineParser parser = new OutputInterpreter.OneLineParser();
script.execute(parser);
final String pid = parser.getLine();
final FileOutputStream strm = new FileOutputStream(pidFile);
strm.write((pid + "\n").getBytes());
strm.close();
} catch (final IOException e) {
throw new CloudRuntimeException("Unable to create the " + pidFile.getAbsolutePath() + ". Are you running as root?", e);
}
}
public static String dumpStack() {
StringBuilder sb = new StringBuilder();
StackTraceElement[] elems = Thread.currentThread().getStackTrace();
if(elems != null && elems.length > 0) {
for(StackTraceElement elem : elems) {
sb.append("\tat ").append(elem.getMethodName()).append("(").append(elem.getFileName()).append(":").append(elem.getLineNumber()).append(")\n");
}
}
return sb.toString();
}
}