Android - How kill process with ppid = 1

Question

I'm in an android project that performs communication through a satellite modem.

You need to run the pppd command for the modem to make the connection via android.

I performed this command through a bash.

   process = Runtime.getRuntime().exec(new String[]{"su", "root", "-c", "/data/local/android_connect.sh", "&> /mnt/sdcard/Download/log.txt"});

In some moments the android creates this process with PPID = 1

When this happens I can not kill the process by executing the following command

android.os.Process.killProcess(pidProcess);
        if (process != null)
            process.destroy();

Is it possible to kill a process with PPID = 1 through android?

Why don't you kill by the PID? – heemayl Jan 25 '17 at 15:11 — heemayl, Jan 25 '17 at 15:11

Andrei Vinogradov · Accepted Answer · 2017-10-19T21:44:42.993

3

It's not a good idea, but you can try to call Runtime.getRuntime().exec("kill -9 " + PID);. Or try to call killBackgroundProcesses instead of killProcess. killProcess does not allow you to kill processes with UID that differs from your app UID, while killBackgroundProcesses can do that for you.

And be sure, that your app have permissions like android.permission.ACCESS_SUPERUSER, android.permission.KILL_BACKGROUND_PROCESSES and android.permission.GET_TASKS.

edited Oct 19 '17 at 21:44

answered Jan 25 '17 at 15:10

Andrei Vinogradov

1,865
15
32

1

Perhaps `-9` is not necessary. The fact that the parent process is `init` should make no difference, should it? – salezica Jan 25 '17 at 15:19
1

Yes, I think it should make really no difference. But if author have problems with terminating proc - I thing SIGKILL could help. – Andrei Vinogradov Jan 26 '17 at 21:23
What's the difference between **killBackgroundProcess**? – IgorGanapolsky Oct 18 '17 at 20:47
1

@IgorGanapolsky I've fixed me reply. I've meant killBackgroundProcess**es**. It allows you to kill processes with UID that differs from your application while **killProcess** can terminate only processes with same UID as your app. – Andrei Vinogradov Oct 19 '17 at 21:42

score 1 · Answer 2 · edited Jan 26 '17 at 00:53

1

The PID=1 is the process manager. It's executed directly after the kernel and if you kill it all the processes will die. It's not recommended to so it, but if you're decided you could try this:

Runtime.getRuntime().exec("kill -9 " + PID);

edited Jan 26 '17 at 00:53

Unheilig

16,196
193
68
98

answered Jan 25 '17 at 15:21

BraveAdmin

685
1
6
15

Does garbage collection still take place after this call? – IgorGanapolsky Oct 18 '17 at 20:48

Android - How kill process with ppid = 1

2 Answers2