You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: plugin_dlopen.go
    path of file: ./repos/gccrs/libgo/go/plugin
    
    the code of the file until where you have to start completion: // Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (linux && cgo) || (darwin && cgo) || (freebsd && cgo) || (hurd & cgo)

package plugin

/*
#cgo linux LDFLAGS: -ldl
#include <dlfcn.h>
#include <limits.h>
#include <stdlib.h>
#include <stdint.h>

#include <stdio.h>

static uintptr_t pluginOpen(const char* path, char** err) {
	void* h = dlopen(path, RTLD_NOW|RTLD_GLOBAL);
	if (h == NULL) {
		*err = (char*)dlerror();
	}
	return (uintptr_t)h;
}

static void* pluginLookup(uintptr_t h, const char* name, char** err) {
	void* r = dlsym((void*)h, name);
	if (r == NULL) {
		*err = (char*)dlerror();
	}
	return r;
}
*/
import "C"

import (
	"errors"
	"sync"
	"unsafe"
)

func open(name string) (*Plugin, error) {
	cPath := make([]byte, C.PATH_MAX+1)
	cRelName := make([]byte, len(name)+1)
	copy(cRelName, name)
	if C.realpath(
		(*C.char)(unsafe.Pointer(&cRelName[0])),
		(*C.char)(unsafe
    
func open(name string) (*Plugin, error) {
	cPath := make([]byte, C.PATH_MAX+1)
	cRelName := make([]byte, len(name)+1)
	copy(cRelName, name)
	if C.realpath(
		(*C.char)(unsafe.Pointer(&cRelName[0])),
		(*C.char)(unsafe.Pointer(&cPath[0]))) == nil {
		return nil, errors.New(`plugin.Open("` + name + `"): realpath failed`)
	}

	filepath := C.GoString((*C.char)(unsafe.Pointer(&cPath[0])))

	pluginsMu.Lock()
	if p := plugins[filepath]; p != nil {
		pluginsMu.Unlock()
		if p.err != "" {
			return nil, errors.New(`plugin.Open("` + name + `"): ` + p.err + ` (previous failure)`)
		}
		<-p.loaded
		return p, nil
	}
	var cErr *C.char
	h := C.pluginOpen((*C.char)(unsafe.Pointer(&cPath[0])), &cErr)
	if h == 0 {
		pluginsMu.Unlock()
		return nil, errors.New(`plugin.Open("` + name + `"): ` + C.GoString(cErr))
	}
	// TODO(crawshaw): look for plugin note, confirm it is a Go plugin
	// and it was built with the correct toolchain.
	if len(name) > 3 && name[len(name)-3:] == ".so" {
		name = name[:len(name)-3]
	}
	if plugins == nil {
		plugins = make(map[string]*Plugin)
	}
	pluginpath, syms, errstr := lastmoduleinit()
	if errstr != "" {
		plugins[filepath] = &Plugin{
			pluginpath: pluginpath,
			err:        errstr,
		}
		pluginsMu.Unlock()
		return nil, errors.New(`plugin.Open("` + name + `"): ` + errstr)
	}
	// This function can be called from the init function of a plugin.
	// Drop a placeholder in the map so subsequent opens can wait on it.
	p := &Plugin{
		pluginpath: pluginpath,
		loaded:     make(chan struct{}),
	}
	plugins[filepath] = p
	pluginsMu.Unlock()

	initStr := make([]byte, len(pluginpath)+len("..inittask")+1) // +1 for terminating NUL
	copy(initStr, pluginpath)
	copy(initStr[len(pluginpath):], "..inittask")

	initTask := C.pluginLookup(h, (*C.char)(unsafe.Pointer(&initStr[0])), &cErr)
	if initTask != nil {
		doInit(initTask)
	}

	// Fill out the value of each plugin symbol.
	updatedSyms := map[string]any{}
	for symName, sym := range syms {
		isFunc := symName[0] == '.'
		if isFunc {
			delete(syms, symName)
			symName = symName[1:]
		}

		fullName := pluginpath + "." + symName
		cname := make([]byte, len(fullName)+1)
		copy(cname, fullName)

		p := C.pluginLookup(h, (*C.char)(unsafe.Pointer(&cname[0])), &cErr)
		if p == nil {
			return nil, errors.New(`plugin.Open("` + name + `"): could not find symbol ` + symName + `: ` + C.GoString(cErr))
		}
		valp := (*[2]unsafe.Pointer)(unsafe.Pointer(&sym))
		if isFunc {
			(*valp)[1] = unsafe.Pointer(&p)
		} else {
			(*valp)[1] = p
		}
		// we can't add to syms during iteration as we'll end up processing
		// some symbols twice with the inability to tell if the symbol is a function
		updatedSyms[symName] = sym
	}
	p.syms = updatedSyms

	close(p.loaded)
	return p, nil
}