Mega Code Archive
Get Process ID with shell command and read by Java code
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//package org.codeandroid.vpnc_frontend;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import android.util.Log;
class Util
{
private static final String LOG_TAG = "VPN_Connections";
public static final int DISCONNECT_NOTIFICATION = 1;
private static final int pidColumn = getPidColumn();
public static int getPidColumn()
{
try
{
Process psProcess = Runtime.getRuntime().exec( "sh" );
OutputStream os = psProcess.getOutputStream();
InputStream is = psProcess.getInputStream();
writeLine( os, null, "ps | grep PID" );
writeLine( os, null, "exit" );
try
{
psProcess.waitFor();
}
catch( InterruptedException interruptedException )
{
Log.e( LOG_TAG, "While trying to read process id", interruptedException );
return -1;
}
String headerLine = readString( is, null, false );
Log.d( LOG_TAG, "Read PS header line as " + headerLine );
if( headerLine == null || headerLine.trim().length() == 0 )
{
Log.e( LOG_TAG, "Attempt to do a PS did not return anything" );
return -1;
}
else
{
StringTokenizer tokenizer = new StringTokenizer( headerLine, " ", false );
int columnCount = tokenizer.countTokens();
for( int index = 0; index < columnCount; index++ )
{
if( "PID".equals( tokenizer.nextToken() ) )
{
Log.d( LOG_TAG, "PID is in column #" + index );
return index;
}
}
return -1;
}
}
catch( IOException e )
{
Log.e( LOG_TAG, "While trying to read process id", e );
return -1;
}
}
public static int getProcessId()
{
if( pidColumn == -1 )
{
return -1;
}
try
{
Process psProcess = Runtime.getRuntime().exec( "sh" );
OutputStream os = psProcess.getOutputStream();
InputStream is = psProcess.getInputStream();
writeLine( os, null, "ps | grep 'vpnc$'" );
writeLine( os, null, "exit" );
try
{
psProcess.waitFor();
}
catch( InterruptedException interruptedException )
{
Log.e( LOG_TAG, "While trying to read process id", interruptedException );
return 0;
}
String pidStringLine = readString( is, null, false );
Log.d( LOG_TAG, "Read vpnc process line as " + pidStringLine );
if( pidStringLine == null || pidStringLine.trim().length() == 0 )
{
Log.d( LOG_TAG, "Attempt to read vpnc process id did not return anything" );
return -1;
}
else
{
StringTokenizer tokenizer = new StringTokenizer( pidStringLine, " ", false );
String pidString = tokenizer.nextToken();
for( int index = 0; index < pidColumn; index++ )
{
pidString = tokenizer.nextToken();
}
Log.d( LOG_TAG, "Read vpnc process id as " + pidString );
try
{
return Integer.parseInt( pidString );
}
catch( NumberFormatException e )
{
Log.w( LOG_TAG, "Could not parse process id of " + pidString, e );
return 0;
}
}
}
catch( IOException e )
{
Log.e( LOG_TAG, "While trying to read process id", e );
return 0;
}
}
public static String readString(InputStream is, PrintWriter logWriter, boolean block) throws IOException
{
if( !block && is.available() == 0 )
{
//Caller doesn't want to wait for data and there isn't any available right now
return null;
}
byte firstByte = (byte)is.read(); //wait till something becomes available
int available = is.available();
byte[] characters = new byte[available + 1];
characters[0] = firstByte;
is.read( characters, 1, available );
String string = new String( characters );
if( logWriter != null )
{
logWriter.println( string );
}
return string;
}
public static void writeLine(OutputStream os, PrintWriter logWriter, String value) throws IOException
{
String line = value + "\n";
os.write( line.getBytes() );
if( logWriter != null )
{
logWriter.println( value );
}
}
public static void debug(String msg)
{
Log.d( LOG_TAG, msg );
}
public static void debug(String msg, Throwable throwable)
{
Log.d( LOG_TAG, msg, throwable );
}
public static void info(String msg)
{
Log.i( LOG_TAG, msg );
}
public static void info(String msg, Throwable throwable)
{
Log.i( LOG_TAG, msg, throwable );
}
public static void warn(String msg)
{
Log.w( LOG_TAG, msg );
}
public static void warn(String msg, Throwable throwable)
{
Log.w( LOG_TAG, msg, throwable );
}
public static void error(String msg)
{
Log.e( LOG_TAG, msg );
}
public static void error(String msg, Throwable throwable)
{
Log.e( LOG_TAG, msg, throwable );
}
public static void printLog(int priority, String msg)
{
Log.println( priority, LOG_TAG, msg );
}
}
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