Android internals 06 - Binder, Typical subsystem (rev_1.1)
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The document discusses Android inter-process communication (IPC) and the Binder driver. It provides an overview of common IPC approaches in Linux and introduces Binder as the IPC mechanism used in Android. Key aspects of Binder covered include how it allows for remote procedure calls between processes using parcels and marshaling. A typical Android subsystem architecture relying on Binder to connect framework and HAL layers is also summarized.
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Android internals 06 - Binder, Typical subsystem (rev_1.1)
- 1. Android internals Egor Elizarov SPbSU 2012
- 2. Legal info Android internals by Egor Elizarov is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License You are free to – copy, distribute, display, and perform the work – make derivative works Under the following conditions – Attribution. You must give the original author credit – Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one All pictures and trademarks are the property of their respective owners. Use of these trademarks and pictures is subject to owners permissions. Corrections, suggestions, contributions and translations are welcome! 2 Egor Elizarov SPbSU 2012
- 3. Lecture 6 Android IPC Typical Android subsystem yegor.yelizarov(at)gmail.com Rev: 1.1 Last update: 06/01/2012 http://vk.com/android_internals 3 Egor Elizarov SPbSU 2012
- 4. Previous time VM types Virtualization approaches Dalvik VM features Interpreter core types JIT algorithm Android application start up process 4 Egor Elizarov SPbSU 2012
- 5. IPC Approaches Classic – System V IPC – Posix IPC Modern – Binder – Cross Memory Attach (CMA) – KNEM – Kdbus 5 Egor Elizarov SPbSU 2012
- 6. Linux IPC Pipe Socket Signal Semaphore Message queue Shared memory 6 Egor Elizarov SPbSU 2012
- 7. Binder Lightweight IPC/RPC Customized re-implementation of Open Binder BeOS -> ACCESS/PalmOS -> Open Binder Per process thread pool for processing requests Synchronous calls between processes Zero copy message transmission 7 Egor Elizarov SPbSU 2012
- 8. Socket vs Binder Binder Socket Associated with PID Associated with FD Local only Network transparency Communication via Stream IO read/write IOCTL 8 Egor Elizarov SPbSU 2012
- 9. Binder facilities 9 Egor Elizarov SPbSU 2012
- 10. Parcels and marshalling Parcel is a message to be send through Binder Different types of data can be marshalled (packed) in parcels To make remote procedure call binder marshalles function arguments and meta data, sends it to remote process and unpacks the results 10 Egor Elizarov SPbSU 2012
- 11. RPC main idea 11 Egor Elizarov SPbSU 2012
- 12. OOP patterns used in Binder Bridge Mediator Proxy 12 Egor Elizarov SPbSU 2012
- 13. Application layer 13 Egor Elizarov SPbSU 2012
- 14. Application layer transaction 14 Egor Elizarov SPbSU 2012
- 15. Android Interface Definition Language 15 Egor Elizarov SPbSU 2012
- 16. AIDL example 16 Egor Elizarov SPbSU 2012
- 17. Application layer internals 17 Egor Elizarov SPbSU 2012
- 18. Service Manager Special Binder node with known address Provide information about existing services All services should be registered in Service Manager (name & binder token) Command line tool: adb service sp<IBinder> binder = defaultServiceManager() ->getService(String16("media.player")); 18 Egor Elizarov SPbSU 2012
- 19. Service Manager workflow 19 Egor Elizarov SPbSU 2012
- 20. Middleware layer Provide binder facilities to java framework Marshalling/unmarshalling Parcels Interaction with kernel Managing threads 20 Egor Elizarov SPbSU 2012
- 21. Middleware layer internals 21 Egor Elizarov SPbSU 2012
- 22. Kernel layer 22 Egor Elizarov SPbSU 2012
- 23. Binder in action 23 Egor Elizarov SPbSU 2012
- 24. Typical subsytem Main logic is implemented in frameworks C++ layer contains some servers (Ex: mediaserver) connected to java framework via Binder Use standard external libraries (Ex: libBluez) HAL as interface for HW vendors 24 Egor Elizarov SPbSU 2012
- 25. Typical subsystem scheme 25 Egor Elizarov SPbSU 2012
- 26. Next Time Graphic subsystem HW acceleration 26 Egor Elizarov SPbSU 2012
- 27. Useful links http://vk.com/android_internals http://0xlab.org/~jserv/android-binder-ipc.pdf http://cs736-android.pbworks.com/w/page/5834468/IPC %20Binder http://www.angryredplanet.com/~hackbod/openbinder/docs/ html/BinderIPCMechanism.html http://mylifewithandroid.blogspot.com/2008/01/about- binders.html 27 Egor Elizarov SPbSU 2012
- 28. Useful links (2) http://free-electrons.com/doc/posix-api.pdf http://lwn.net/Articles/466304/ http://www.slideshare.net/opersys/android- internals https://github.com/keesj/gomo/wiki/AndroidNati veBinder http://lwn.net/Articles/472984/ 28 Egor Elizarov SPbSU 2012
- 29. Thanks to Sergey Matyukevich for review and advices (www.linkedin.com/pub/sergey-matyukevich/31/889/769) Nikolay F. Fominykh for review and advices Nikita Shulga for advices and notes (http://www.linkedin.com/pub/nikita-shulga/8/582/287) Grigory Tolstolytkin for advices and notes (http://www.linkedin.com/pub/grigory- tolstolytkin/2a/b41/74) 29 Egor Elizarov SPbSU 2012