org.rzo.yajsw.os.posix.bsd.AppStarter Maven / Gradle / Ivy

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YAJSW is a java centric implementation of the java service wrapper by tanuki (JSW). It aims at being mostly configuration compliant with the original. It should therefore be easy to switch from JSW to YAJSW.

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package org.rzo.yajsw.os.posix.bsd;

import java.util.ArrayList;
import java.util.List;

import org.rzo.yajsw.os.posix.PosixProcess;
import org.rzo.yajsw.os.posix.PosixProcess.CLibrary;

public class AppStarter
{
	public static void main(String[] args)
	{
		// get pid and send it to parent
		int pid = CLibrary.INSTANCE.getpid();
		System.out.println("PID:" + pid);
		System.out.flush();

		// set priority
		if (CLibrary.INSTANCE.nice(1) == -1)
			System.out.println("could not set priority ");
		if (getUser() != null)
			try
		{
			new PosixProcess().switchUser(getUser(), getPassword());
		}
		catch (Throwable ex)
		{
			ex.printStackTrace();
		}


		// detach from parent
		CLibrary.INSTANCE.umask(0);
		CLibrary.INSTANCE.setsid();

		System.out.println("calling exec");
		// close streams ?
		if (!isPipeStreams())
		{
			/*
			try
			{
				System.in.close();
			}
			catch (IOException e)
			{
				e.printStackTrace();
			}
			*/
			
			System.out.close();
			System.err.close();
		}
		
		String[] env = null;//getEnv();

		// start the subprocess
		int ret = -1;
		try
		{
			if (env == null)
				CLibrary.INSTANCE.execvp(args[0], args);
			else
				CLibrary.INSTANCE.execve(args[0], args, env);
			System.out.println("ret "+ret);
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}

	}

	private static boolean isPipeStreams()
	{
		return System.getProperty("wrapperx.pipeStreams") != null;
	}

	private static String getPassword()
	{
		return System.getProperty("wrapperx.password");
	}

	private static String getUser()
	{
		return System.getProperty("wrapperx.user");
	}

	private static String[] getEnv()
	{
		List result = new ArrayList();
		for (String key : System.getenv().keySet())
		{
			result.add(key+"="+System.getenv(key));
		}
		if (result.isEmpty())
			return null;
		String[] arr = new String[result.size()];
		int i = 0;
		for (String x : result)
		{
			arr[i] = x;
			System.out.println(x);
			i++;
		}
		return arr;
	}


}