While researching the filesystem training I came across a particularly bad example I have given in my talks and slides about how rename() works, and I felt it's prudent that I own up to this mistake and publish the correction.

TL;DR:

My provided example of rename("./a", "./b") is …

For those of you who requested and/or couldn't make it, here are the slides from my Alligatorcon talk:

Gergely Kalman: The forgotten art of filesystem magic

It's a prequel to the guide, that is more dry and technical: The missing guide to the security of filesystems and file APIs …