yogesh
Reputation: 1
Unix: Delete File code giving some process
I have coded java code to delete the file from the particular path. We are able to see the process running using the below command and we find only one entry.
root@ad4d # ps -ef | grep Del
root 27896 27895 0 Jun 24 pts/5 0:49 java -jar /oracle/php/online/jars/dist/DelFile.jar
But when the Administrator checks the process which is running from the command below we can see many child threads and parent thread process below
root@almt4d # ps -aAdeflcjLPyZ | grep Del
S global root 27896 27895 26891 26891 1 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 2 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 3 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 4 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 5 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 6 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 7 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 8 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 9 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 10 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 11 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 12 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 13 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 14 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 15 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 16 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 17 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 18 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 19 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 20 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 21 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 22 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 23 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 24 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 25 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 26 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 27 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 28 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 29 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 30 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 31 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 32 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 33 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 34 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 35 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 36 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 37 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 38 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 39 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 40 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 41 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 42 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 43 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 44 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 45 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 46 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 47 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 48 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 49 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 50 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 51 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 52 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 53 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 54 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 55 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 56 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 57 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 58 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 59 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 60 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 61 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 62 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 63 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 64 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 65 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 66 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 67 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 68 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 69 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 70 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 71 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 72 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 73 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 74 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 75 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 76 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 77 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 78 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 79 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 80 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 81 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 82 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 83 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 84 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 85 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 86 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 87 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 88 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:04 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 89 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 90 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 91 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 92 - 96 TS 58 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 93 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 94 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 95 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:45 java -jar /oracle/php/online/jars/d
S global root 27896 27895 26891 26891 96 - 96 TS 59 37144 116392 ? Jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d
Can anyone please explain from where these kind of child and parent thread process started executing. I have executed only one DelFile.java which has only one thread Is there anyway to control the child threads which are visible to the Administrator using below command
root@almt4d # ps -aAdeflcjLPyZ | grep Del
DelFile.java
package DelFile;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.SimpleLayout;
public class DelFile extends Thread{
static Logger log =Logger.getLogger(DelFile.class);
FileAppender app = null;
public DelFile()throws IOException{
app = new FileAppender(new SimpleLayout(), "/oracle/php/online/jars/dist/del_file.log");
}
public void logSet(){
app.setLayout(new PatternLayout(("%d{yyyy-MM-dd HH:mm:ss} %-5.5p [%t] %m%n")));
log.addAppender(app);
}
boolean flage=true;
public void run(){
while(flage){
final String str="xls";
String add="/oracle/php/online/jars/dist/";
String[] paths;
File f = null;
try{
f = new File(add);
paths=f.list();
for(String path:paths)
{
String temp="";
String temp1="";
int count=0;
for(int i=path.length()-1;i>=0;i--){
if(path.charAt(i)!='.'){
count++;
temp+=path.charAt(i);//pmbs
}else{
for(int j=temp.length()-1;j>=0;j--){
temp1+=temp.charAt(j);
}
if(str.length()==count){
break;
}
}
}
if(str.equals(temp1)){
long time= new File(add+path).lastModified();
long utime=time+600000l;
while(utime>System.currentTimeMillis()){
Thread.sleep(601000);
}
logSet();
log.info(path +" : File is deleted");
new File(add+path).delete();
}
}
}catch(NullPointerException np){
try{
Thread.sleep(600000);
}catch(InterruptedException ip) {}
}catch(InterruptedException ie){
}
}
}
public static void main(String[] args)throws IOException{
DelFile r=new DelFile();
r.start();
}
}
Upvotes: 0
Views: 59
Answers (1)
laune
Reputation: 31300
boolean flage=true;
public void run(){
while(flage){
// flage not referenced below, no break, no return
...
}
This is called an endless loop. It causes the thread to run for ever, which explains the many entries seen by ps.
Later
The LWPs (or threads) you see are JVM internal threads - not threads created by your program. I thought you were worried why they'd remain in the machine, apparently for ever, which is indeed due to the endless loop: the program doesn't terminate even after all files are gone.
Upvotes: 1
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