How Can Go Applications Interact with Functions Inside a .so File?

Invoking Functions in an SO File from Go

Question: Can Go applications interact with functions in a static object (.so) file?

Answer: Yes, it is feasible to load and invoke functions from a library using Go. However, the built-in syscall package does not provide the LoadLibrary function, despite online claims to the contrary.

To accomplish this, you can leverage cgo, a tool that bridges C and Go code. Here's an example using dlopen and related functions from the POSIX C library:

<code class="go">// #cgo LDFLAGS: -ldl
// #include <dlfcn.h>
import "C"

import fmt

func foo() {
    handle := C.dlopen(C.CString("libfoo.so"), C.RTLD_LAZY)
    bar := C.dlsym(handle, C.CString("bar"))
    fmt.Printf("bar is at %p\n", bar)
}</code>

In this example:

• LDFLAGS specifies that the dlopen library should be linked to the Go program.
• dlopen loads the shared object into memory.
• dlsym retrieves the address of the bar function within the loaded library.
• The fmt.Printf statement outputs the memory address where bar resides.

By following this approach, you can seamlessly call functions in external libraries from your Go code.

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