How to delete a directory and its contents in (POSIX) C? [duplicate]

Answer 1

1. You need to use nftw() (or possibly ftw()) to traverse the hierarchy.
2. You need to use unlink() to remove files and other non-directories.
3. You need to use rmdir() to remove (empty) directories.

You would be better off using nftw() (rather than ftw()) since it gives you controls such as FTW_DEPTH to ensure that all files under a directory are visited before the directory itself is visited.