| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.os; |
| |
| import android.compat.annotation.UnsupportedAppUsage; |
| import android.util.Slog; |
| |
| import com.android.internal.util.FastPrintWriter; |
| |
| import java.io.BufferedInputStream; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.PrintWriter; |
| |
| /** |
| * Helper for implementing {@link Binder#onShellCommand Binder.onShellCommand}. |
| * @hide |
| */ |
| public abstract class ShellCommand extends BasicShellCommandHandler { |
| private ShellCallback mShellCallback; |
| private ResultReceiver mResultReceiver; |
| |
| public int exec(Binder target, FileDescriptor in, FileDescriptor out, FileDescriptor err, |
| String[] args, ShellCallback callback, ResultReceiver resultReceiver) { |
| mShellCallback = callback; |
| mResultReceiver = resultReceiver; |
| final int result = super.exec(target, in, out, err, args); |
| |
| if (mResultReceiver != null) { |
| mResultReceiver.send(result, null); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Adopt the ResultReceiver that was given to this shell command from it, taking |
| * it over. Primarily used to dispatch to another shell command. Once called, |
| * this shell command will no longer return its own result when done. |
| */ |
| public ResultReceiver adoptResultReceiver() { |
| ResultReceiver rr = mResultReceiver; |
| mResultReceiver = null; |
| return rr; |
| } |
| |
| /** |
| * Helper for just system services to ask the shell to open an output file. |
| * @hide |
| */ |
| public ParcelFileDescriptor openFileForSystem(String path, String mode) { |
| if (DEBUG) Slog.d(TAG, "openFileForSystem: " + path + " mode=" + mode); |
| try { |
| ParcelFileDescriptor pfd = getShellCallback().openFile(path, |
| "u:r:system_server:s0", mode); |
| if (pfd != null) { |
| if (DEBUG) Slog.d(TAG, "Got file: " + pfd); |
| return pfd; |
| } |
| } catch (RuntimeException e) { |
| if (DEBUG) Slog.d(TAG, "Failure opening file: " + e.getMessage()); |
| getErrPrintWriter().println("Failure opening file: " + e.getMessage()); |
| } |
| if (DEBUG) Slog.d(TAG, "Error: Unable to open file: " + path); |
| getErrPrintWriter().println("Error: Unable to open file: " + path); |
| |
| String suggestedPath = "/data/local/tmp/"; |
| if (path == null || !path.startsWith(suggestedPath)) { |
| getErrPrintWriter().println("Consider using a file under " + suggestedPath); |
| } |
| return null; |
| } |
| |
| public int handleDefaultCommands(String cmd) { |
| if ("dump".equals(cmd)) { |
| String[] newArgs = new String[getAllArgs().length-1]; |
| System.arraycopy(getAllArgs(), 1, newArgs, 0, getAllArgs().length-1); |
| getTarget().doDump(getOutFileDescriptor(), getOutPrintWriter(), newArgs); |
| return 0; |
| } |
| return super.handleDefaultCommands(cmd); |
| } |
| |
| @UnsupportedAppUsage |
| public String peekNextArg() { |
| return super.peekNextArg(); |
| } |
| |
| /** |
| * Return the {@link ShellCallback} for communicating back with the calling shell. |
| */ |
| public ShellCallback getShellCallback() { |
| return mShellCallback; |
| } |
| } |