Android java process returns 1 when executing "su"

Question

i'm trying to write onto the "/data/myFolder" folder on the android virtual device during test and to do that, i do:

String[] cmd ={"su", "mkdir", dir};
    int out = 99;

    try {

        Process p = Runtime.getRuntime().exec(cmd);
        out = p.waitFor();
        BufferedInputStream in = new BufferedInputStream(p.getErrorStream());
        byte[] bytes = new byte[4096];
        while (in.read(bytes) != -1) {

        }

        in.close();
        logger.info("exit status:" + out);

    } catch (IOException e) {
        logger.severe("IOException " + e.getMessage());
        e.printStackTrace();
    } catch (InterruptedException e) {
        logger.severe("InterruptedException " + e.getMessage());
        e.printStackTrace();
    }
    if (out != 0) {
        logger.severe("Folder " + dir + " not created,exit status: " + out);
    }

or i've tried

String cmd ={"su mkdir" + dir};

but the exit status is 1 and it not create any folder. using su mkdir /data/myFolder from adb shell works fine. Why this code? what means? (i know it means that something went wrong, but what? didn't find any documentation about android mkdir exit code values). Thank's

What happens if you add a space to the thing you tried: `String cmd = "su mkdir " + dir;`? — Jite, Nov 13 '13 at 11:50
possible duplicate of [what does the su mean: process = Runtime.getRuntime().exec("su");](http://stackoverflow.com/questions/6100662/what-does-the-su-mean-process-runtime-getruntime-execsu) — Torben, Nov 13 '13 at 12:18
Of course you get. You are still executing "su", not "mkdir". Please do a Google search about what the "su"-command actually does. — Torben, Nov 13 '13 at 12:30
@Torben you are right, i was executing su command and not mkdir as root. now String cmd = "mkdir "+ dir; Process p = Runtime.getRuntime().exec(cmd); works fine. — idell, Nov 13 '13 at 12:41

score 2 · Answer 1 · answered Apr 04 '22 at 01:16

2

error code 1 is EPERM /* Not super-user */ on Android if anyone is curious.

So there's something not working right with your root

answered Apr 04 '22 at 01:16

georgiecasey

21,793
11
65
74

score 0 · Answer 2 · answered Nov 13 '13 at 11:54

0

I use below code to give commands

try {
            Process sh = Runtime.getRuntime().exec("su", null, null);
            OutputStream os = sh.getOutputStream();
            byte[] mScreenBuffer = ("mkdir dir ")
                    .getBytes();
            os.write(mScreenBuffer);
            os.flush();
            os.close();
            sh.waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }

answered Nov 13 '13 at 11:54

Dinesh Prajapati

9,274
5
30
47

like this, i redirect the sdtOutput and than i write into it "mkdir dir ". doesn't make sense for me. – idell Nov 13 '13 at 12:27
Please specify what part exactly confuses you. – Torben Nov 13 '13 at 12:32
is not it confuses me, the problem is that like you wrote, i write "mkdir dir " to the standard output, i don't execute "mkdir dir " command. – idell Nov 13 '13 at 12:51
If u look at the code it's BufferedInputStream in = new BufferedInputStream(p.getErrorStream()); and it's input and error streams – Dinesh Prajapati Nov 13 '13 at 13:08
i'm talking about your answer, and you wrote OutputStream os = sh.getOutputStream(); – idell Nov 13 '13 at 13:54
That is how it should be. you need to write on the outPut Stream of the Process then only it will execute – Dinesh Prajapati Nov 14 '13 at 04:28

Android java process returns 1 when executing "su"

2 Answers2