How to Call Functions in Static Object Files from Go?

Calling Functions in Static Object Files from Go

You seek to invoke functions from a shared library (.so) file within Go. While you may have encountered suggestions to employ syscall.LoadLibrary for this purpose, your attempts have been met with the error "undefined: syscall.LoadLibrary."

However, it is indeed feasible to load a shared library and access its functions from Go. To achieve this on a POSIX platform, you can leverage cgo and interact with the system's native API.

Here's a simple demonstration using cgo:

<code class="go">// +build linux darwin
// #cgo LDFLAGS: -ldl
// #include <dlfcn.h>

package main

import (
    "C"
    "fmt"
)

func foo() {
    // Load the shared library
    handle := C.dlopen(C.CString("libfoo.so"), C.RTLD_LAZY)

    // Retrieve the function pointer from the library
    bar := C.dlsym(handle, C.CString("bar"))

    // Print the function pointer address
    fmt.Printf("bar is at %p\n", bar)
}

func main() { foo() }</code>

In this example:

• The build directive restricts compilation to Linux and Darwin platforms.
• #cgo LDFLAGS: -ldl links the executable to the dynamic linker library (libdl).
• #include imports the necessary C headers for the dlopen and dlsym functions.
• The foo function loads the shared library, retrieves the function pointer for the "bar" function, and prints its address.

Note that the exact syntax and function names may vary depending on your underlying system and compiler. By utilizing cgo and interacting with the native system API, you can bridge the gap between Go and shared libraries, extending the capabilities of your applications.

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