The ffi package wraps the libffi C library (and dlopen/dlclose) to provide an easy way to call arbitrary functions from Go.

ffi is go-get-able:

$ go get github.com/sbinet/go-ffi/pkg/ffi

// dl-open a library: here, the math library on darwin
lib, err := ffi.NewLibrary("libm.dylib")
handle_err(err)

// get a handle to 'cos', with the correct signature
cos, err := lib.Fct("cos", ffi.Double, []Type{ffi.Double})
handle_err(err)

// call it
out := cos(0.).Float()
println("cos(0.)=", out)

err = lib.Close()
handle_err(err)

• no check is performed b/w what the user provides as a signature and the "real" signature

• it would be handy to use some tool to automatically infer the "real" function signature

• it would be handy to also handle structs

• better handling of types with no direct equivalent in go (short,void,...)

• better handling of C_string and conversion to/from Go strings

http://go.pkgdoc.org/github.com/sbinet/go-ffi/pkg/ffi