How can I call C functions from Go using the Foreign Function Interface (FFI)?

Calling C Functions from Go Using the Foreign Function Interface

Question:
In Go, how can I leverage the "foreign function interface" (FFI) to invoke a function written in C?

Answer:
To utilize Go's FFI to call a C function:

1. Reference the sample code provided in the Go repository:

   • Navigate to the file located at: https://go.googlesource.com/go/ /refs/heads/main/src/runtime/cgo/testscript.go
   • This file demonstrates how to integrate a C library within Go, providing comprehensive explanations via comments.

2. Understand the key components of the FFI:

   • The FFI bridges the gap between Go and C by enabling Go to access C functions directly.
   • C functions can be declared in Go using the import "C" directive, followed by extern declarations.
   • Data can be exchanged between Go and C via the FFI, but it requires manual marshalling and unmarshalling operations.

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