Comment by mahboi

All the standard Rust libs use results. The standard C libs use errno, return 0, return -1, return EOF, return nullptr, segfault, or of course UB. Other libs dream up things like returning "*". C++ has exceptions in some areas but not others, and if you turn them off, they're segfaults. I actually like C, at least more than C++, but the error handling is the worst part.