How to programmatically clear the filesystem memory cache in C++ on a Linux system?

Question

I'm writing a benchmark tool in C++ where I want to clear the filesystem memory cache between experiments. I'm aware of the following console commands:

sync
echo 3 > /proc/sys/vm/drop_caches

My question is how can i do this programmatically directly within C++?

Any help is appreciated!

Answer 1

Just write to it :

sync();

std::ofstream ofs("/proc/sys/vm/drop_caches");
ofs << "3" << std::endl;