Fixup CPU Teampeature for RBFeeder

This is a simple hook library for RBFeeder to fixup the CPU temperature measurement function on non-Raspberry Pi devices.

Implementation

When running on a Raspberry Pi, the CPU temperature is read from the /sys/class/thermal/thermal_zone0/temp file. However this file does not exist on some other devices, and RBFeeder will crash because the file is not found.

This library hooked fopen function to intercept the file open request for /sys/class/thermal/thermal_zone0/temp and return a fake file handle with a fixed temperature value if we are unable to open that file.

Usage

1. Build the library by running make with cross compiler or on the target device.

$ make CC=arm-linux-gnueabihf-gcc

2. LD_PRELOAD the library when running RBFeeder.

$ LD_PRELOAD=./libfixcputemp.so ./rbfeeder

or if you are using qemu

$ qemu-arm -E LD_PRELOAD=./librbfeeder_fixcputemp.so ./rbfeeder