fake rtc linux kernel module

This module creates additional /dev/rtcN device with reduced features. It supports :

• Reading/setting time via hwclock utility, or RTC_RD_TIME/RTC_SET_TIME ioctls
• Basic /sys/class/rtc/rtcN/ interface
• Adjusting "time speed" via /proc/rtc-syntacore/speed. 1.0 means tick per second, just like real clock. Biger or fewer than 1.0 means faster or slower passing of time. This coefficient supports up to 6 digits in fractional part, and speed * 1000000 is limited to unsigned int.
• Random mode. If 1 is set in /proc/rtc-syntacore/rand, time speed coefficient updates on every time reading to random number from 0 to value from /proc/rtc-syntacore/speed.

Script ./tester.sh will build this module and test functionality (and clean up after itself). Run it with 'sudo'.

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note for future researchers

^{This was a solution for the trial task for embedded software intern position at Syntacore https://syntacore.com/page/company/careers. I didn't recieve any feedback about the code (either I didn't get a job, obviously), so I couldn't tell you how bad the code is. I'll just leave it here for a reference, cause it seems that no one gives a fu. Task itself is in trial_task_sw.pdf.}