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# Mixing Scheme 48 and C

This chapter describes an interface for calling C functions from Scheme, calling Scheme functions from C, and allocating storage in the Scheme heap.. Scheme 48 manages stub functions in C that negotiate between the calling conventions of Scheme and C and the memory allocation policies of both worlds. No stub generator is available yet, but writing stubs is a straightforward task.

- Available facilities
- Shared bindings
- Calling C functions from Scheme
- Adding external modules to the `Makefile`
- Dynamic loading
- Compatibility
- Accessing Scheme data from C
- Calling Scheme functions from C
- Interacting with the Scheme heap
- Using Scheme records in C code
- Raising exceptions from external code
- Unsafe functions and macros

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