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Deep Dive into Android 
IPC/Binder Framework at 
Android Builders Summit 
2013
Aleksandar (Saša) Gargenta, Marakana Inc.
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2013 Marakana, Inc., Creative Commons (Attribution, NonCommercial, ShareAlike) 3.0 License
Last Updated: 2013-02-19
Why are you here?
You want to better understand how Android works
Intents, ContentProviders, Messenger
Access to system services
Life-cycle call-backs
Security
You want to modularize your own business logic
across application boundaries via a highly efficient
and low-latency IPC framework
You want to add new system services and would like to learn how to best expose them to your
developers
You just care about IPC and Binder seems unique and interesting
You don’t have anything better to do?
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Objectives
Binder Overview
IPC
Advantages of Binder
Binder vs Intent/ContentProvider/Messenger-based IPC
Binder Terminology
Binder Communication and Discovery
AIDL
Binder Object Reference Mapping
Binder by Example
Async Binder
Memory Sharing
Binder Limitations
Security
Slides and screencast from this class will be posted to: http://mrkn.co/bgnhg
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Who am I?
Aleksandar Gargenta
Developer and instructor of Android Internals and Security training at
Marakana
Founder and co-organizer of San Francisco Android User Group
(sfandroid.org)
Founder and co-organizer of San Francisco Java User Group (sfjava.org)
Co-founder and co-organizer of San Francisco HTML5 User Group
(sfhtml5.org)
Speaker at AnDevCon, AndroidOpen, Android Builders Summit, etc.
Server-side Java and Linux, since 1997
Android/embedded Java and Linux, since 2009
Worked on SMS, WAP Push, MMS, OTA provisioning in previous life
Follow
@agargenta
+Aleksandar Gargenta
http://marakana.com/s/author/1/aleksandar_gargenta
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What is Binder?
An IPC/component system for developing object-
oriented OS services
Not yet another object-oriented kernel
Instead an object-oriented operating system
environment that works on traditional kernels,
like Linux!
Essential to Android!
Comes from OpenBinder
Started at Be, Inc. as a key part of the "next
generation BeOS" (~ 2001)
Acquired by PalmSource
First implementation used in Palm Cobalt (micro-kernel based OS)
Palm switched to Linux, so Binder ported to Linux, open-sourced (~ 2005)
Google hired Dianne Hackborn, a key OpenBinder engineer, to join the Android team
Used as-is for the initial bring-up of Android, but then completely rewritten (~ 2008)
OpenBinder no longer maintained - long live Binder!
Focused on scalability, stability, flexibility, low-latency/overhead, easy programming model
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IPC
Inter-process communication (IPC) is a framework for
the exchange of signals and data across multiple
processes
Used for message passing, synchronization, shared
memory, and remote procedure calls (RPC)
Enables information sharing, computational speedup,
modularity, convenience, privilege separation, data
isolation, stability
Each process has its own (sandboxed) address
space, typically running under a unique system
ID
Many IPC options
Files (including memory mapped)
Signals
Sockets (UNIX domain, TCP/IP)
Pipes (including named pipes)
Semaphores
Shared memory
Message passing (including queues, message bus)
Intents, ContentProviders, Messenger
Binder!
Why Binder?
Android apps and system services run in separate
processes for security, stability, and memory
management reasons, but they need to communicate
and share data!
Security: each process is sandboxed and run
under a distinct system identity
Stability: if a process misbehaves (e.g. crashes), it
does not affect any other processes
Memory management: "unneeded" processes are
removed to free resources (mainly memory) for
new ones
In fact, a single Android app can have its
components run in separate processes
IPC to the rescue
But we need to avoid overhead of traditional IPC
and avoid denial of service issues
Android’s libc (a.k.a. bionic) does not support System
V IPCs,
No SysV semaphores, shared memory segments,
message queues, etc.
System V IPC is prone to kernel resource leakage, when a process "forgets" to release shared IPC
resources upon termination
Buggy, malicious code, or a well-behaved app that is low-memory 
SIGKILL
SIGKILL'ed
Binder to the rescue!
Its built-in reference-counting of "object" references plus death-notification mechanism make it
suitable for "hostile" environments (where lowmemorykiller roams)
When a binder service is no longer referenced by any clients, its owner is automatically notified
that it can dispose of it
Many other features:
"Thread migration" - like programming model:
Automatic management of thread-pools
Methods on remote objects can be invoked as if they were local - the thread appears to
"jump" to the other process
Synchronous and asynchronous (
oneway
oneway) invocation model
Identifying senders to receivers (via UID/PID) - important for security reasons
Unique object-mapping across process boundaries
A reference to a remote object can be passed to yet another process and can be used as an
identifying token
Ability to send file descriptors across process boundaries
Simple Android Interface Definition Language (AIDL)
Built-in support for marshalling many common data-types
Simplified transaction invocation model via auto-generated proxies and stubs (Java-only)
Recursion across processes - i.e. behaves the same as recursion semantics when calling methods
on local objects
Local execution mode (no IPC/data marshalling) if the client and the service happen to be in the
same process
But:
No support for RPC (local-only)
Client-service message-based communication - not well-suited for streaming
Not defined by POSIX or any other standard
Most apps and core system services depend on Binder
Most app component life-cycle call-backs (e.g. onResume()
onResume(), onDestory()
)
onDestory(), etc.) are invoked by
ActivityManagerService
ActivityManagerService via binder
Turn off binder, and the entire system grinds to a halt (no display, no audio, no input, no sensors,
…)
Unix domain sockets used in some cases (e.g. RILD)
IPC with 
Intent
Intents and
ContentProvider
ContentProviders?
Android supports a simple form of IPC via intents and
content providers
Intent messaging is a framework for asynchronous
communication among Android components
Those components may run in the same or across
different apps (i.e. processes)
Enables both point-to-point as well as publish-
subscribe messaging domains
The intent itself represents a message containing
the description of the operation to be performed
as well as data to be passed to the recipient(s)
Implicit intents enable loosely-coupled APIs
ContentResolvers communicate synchronously with ContentProviders (typically running in separate
apps) via a fixed (CRUD) API
All android component can act as a senders, and most as receivers
All communication happens on the Looper (a.k.a. main) thread (by default)
But:
Not really OOP
Asynchronous-only model for intent-based communication
Not well-suited for low-latency
Since the APIs are loosely-defined, prone to run-time errors
All underlying communication is based on Binder!
In fact, Intents and ContentProvider are just a higher-level abstraction of Binder
Facilitated via system services: 
ActivityManagerService
ActivityManagerService and 
PackageManagerService
PackageManagerService
For example:
src/com/marakana/shopping/UpcLookupActivity.java
src/com/marakana/shopping/UpcLookupActivity.java
src/com/google/zxing/client/android/CaptureActivity.java
src/com/google/zxing/client/android/CaptureActivity.java:
Specify who we want to call
Specify the input parameter for our call
Initiate the call asynchronously
Receive the response via a call-back
Verify that this is the response we we expecting
Get the response
Initiate another IPC request, but don’t expect a result
On the service side, put the result into a new intent
Send the result back (asynchronously)
public class ProductLookupActivity extends Activity {
private static final int SCAN_REQ = 0;
public void onClick(View view) {
Intent intent = new Intent("com.google.zxing.client.android.SCAN");           //
intent.setPackage("com.google.zxing.client.android");                         //
intent.putExtra("SCAN_MODE", "PRODUCT_MODE");                                 //
super.startActivityForResult(intent, SCAN_REQ);                               //
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) { //
if (requestCode == SCAN_REQ && resultCode == RESULT_OK) {                     //
String barcode = data.getStringExtra("SCAN_RESULT");                        //
String format = data.getStringExtra("SCAN_RESULT_FORMAT");                  //
super.startActivity(
new Intent(Intent.ACTION_VIEW,
Uri.parse("http://www.upcdatabase.com/item/" + barcode)));              //
}
}
}
public class CaptureActivity extends Activity {
private void handleDecodeExternally(Result rawResult, …) {
Intent intent = new Intent(getIntent().getAction());
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
intent.putExtra(Intents.Scan.RESULT, rawResult.toString());                   //
intent.putExtra(Intents.Scan.RESULT_FORMAT,
rawResult.getBarcodeFormat().toString());
super.setResult(Activity.RESULT_OK, intent);
super.finish();                                                               //
}
}
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