Question

I’m using opendir function to check if a directory exists. The problem is that I’m using it on a massive loop and it’s inflating the ram used by my app.

What is the best (fastest) way to check if a directory exists in C? What is the best (fastest) way to create it if doesn’t exists?

Answer 1

You could call mkdir(). If the directory does not exist then it will be created and 0 will be returned. If the directory exists then -1 will be returned and errno will be set to EEXIST.