# FFI Idioms

Writing FFI code is an entire course in itself. However, there are several
idioms here that can act as pointers, and avoid traps for inexperienced users of
`unsafe` Rust.

This section contains idioms that may be useful when doing FFI.

1. [Idiomatic Errors](./errors.md) - Error handling with integer codes and
   sentinel return values (such as `NULL` pointers)

2. [Accepting Strings](./accepting-strings.md) with minimal unsafe code

3. [Passing Strings](./passing-strings.md) to FFI functions