binder req

1.any process should be able to transfer control and data to any other process in the system
2.device driver is equally visible to all processes in the system
3.a mechanism that can uniquely package data and control from one process to another
4.process A wants to send data and control,it sends ioctl to b-driver,telling which process to send,which function to call,which data to process.
5.b-driver has a mechanism where it can find from the given information the target process where its target entry points are present,it invokes the target process,passes control to the entry point with data.
6.passing control to the entry point-- at initialization in source and target, an ioctl, a thread is kept waiting for a notification or even APC is defined in the process.Once b-driver determines its target it calls the process through returning the ioctl,waking thread,or calling apc with the
entry points control code.it also passes data to the target.