How do I programmatically get the free disk space for a directory in Linux

Question

Is there a function that returns how much space is free on a drive partition given a directory path?

Answer 1

With C++17

You can use std::filesystem::space:

#include   // only needed for screen output

#include 
namespace fs = std::filesystem;

int main()
{
    fs::space_info tmp = fs::space("/tmp");

    std::cout << "Free space: " << tmp.free << '\n'
              << "Available space: " << tmp.available << '\n';
}