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# FFI Idioms
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Writing FFI code is an entire course in itself. However, there are several
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idioms here that can act as pointers, and avoid traps for inexperienced users of
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`unsafe` Rust.
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This section contains idioms that may be useful when doing FFI.
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1. [Idiomatic Errors](./errors.md) - Error handling with integer codes and
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sentinel return values (such as `NULL` pointers)
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2. [Accepting Strings](./accepting-strings.md) with minimal unsafe code
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3. [Passing Strings](./passing-strings.md) to FFI functions
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