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Editorial Team
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Asked: 2026-06-10T12:42:43+00:00

Suppose this: Runtime runtime = Runtime.getRuntime(); Process process = runtime.exec(SU); DataOutputStream processStream = new

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Suppose this:

Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(SU);
DataOutputStream processStream = new DataOutputStream(process.getOutputStream());
processStream.writeChars("cat /qwerty");
processStream.writeChars(EXIT);
processStream.flush();

int status = process.waitFor();

Log.d("EXIT STATUS", String.valueOf(status));

process.waitFor(); causes current thread to wait forever. I guess the problem is with that invalid command(I made that deliberately). But how do I handle such situations?

Busybox 1.17.1

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1 Answer

  1. Editorial Team

    When you send commands using the writeChars, they are all going on the same line in the shell and never being actually executed I think. You need to put newlines in to make the shell execute. Try this:

    Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(SU);
DataOutputStream processStream = new DataOutputStream(process.getOutputStream());
processStream.writeChars("cat /qwerty\n");
processStream.writeChars("exit \n");
processStream.flush();

int status = process.waitFor();

Log.d("EXIT STATUS", String.valueOf(status));
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