Android emulator HAL

We built the Android emulator in Chapter 2, Setting Up the Development Environment. In order to have an overview of Android emulator HAL, we can take a look at the $OUT/system/lib/hw folder as follows:

We can see that there is a list of shared libraries. These are the shared libraries of goldfish HAL. The source code of the preceding shared libraries can be found in the device/generic/goldfish folder. The following table shows the relationship between the shared library, device node, and hardware module:

Hardware	Device	Lib (HAL)
audio	/dev/eac	audio.primary.goldfish.so
camera	/dev/qemu_pipe	camera.goldfish.jpeg.socamera.goldfish.so
fingerprint	/dev/qemu_pipe	fingerprint.goldfish.so
gps	/dev/qemu_pipe	gps.goldfish.so
lights	/dev/qemu_pipe	lights.goldfish.so
power	/dev/qemu_pipe	power.goldfish.so
sensors	/dev/qemu_pipe	sensors.goldfish.so
vibrator	/dev/qemu_pipe	vibrator.goldfish.so
graphics	/dev/qemu_pipe	gralloc.goldfish.so
serial	/dev/ttyS[0 - 2]	simple device don't need a separate shared library

As...