Laura Kassovic <******@****.***> 1701107622 -0800

	// loaded from system32.
	var dll *DLL
	var err error
	if d.Name == "kernel32.dll" {
		dll, err = LoadDLL(d.Name)
	} else {
		dll, err = loadLibraryEx(d.Name, d.System)
	}
	if err != nil {
		return err
	}

	// Non-racy version of:
	// d.dll = dll
	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.dll)), unsafe.Pointer(dll))
	return nil
}

// (currently: during init), and not concurrent with DLL loading.
var IsSystemDLL = map[string]bool{}

// Add notes that dll is a system32 DLL which should only be loaded
// from the Windows SYSTEM32 directory. It returns its argument back,
// for ease of use in generated code.
func Add(dll string) string {
	IsSystemDLL[dll] = true
	return dll

// A DLL implements access to a single DLL.
type DLL struct {
	Name   string
	Handle Handle
}

// LoadDLL loads the named DLL file into memory.
//
// If name is not an absolute path and is not a known system DLL used by
// Go, Windows will search for the named DLL in many locations, causing
// potential DLL preloading attacks.
//

[!GOOS:windows] skip

go run .
stdout 'ws2_32.dll: not found'

go run -tags net .
stdout 'ws2_32.dll: found'

-- go.mod --
module m

go 1.21

-- utils.go --
package main

import (
	"fmt"
	"syscall"
	"unsafe"
)

func hasModuleHandle() {
	const ws2_32 = "ws2_32.dll"
	getModuleHandle := syscall.MustLoadDLL("kernel32.dll").MustFindProc("GetModuleHandleW")

	"reflect"
	"runtime"
	"strconv"
	"strings"
	"syscall"
	"testing"
	"unsafe"
)

type DLL struct {
	*syscall.DLL
	t *testing.T
}

func GetDLL(t *testing.T, name string) *DLL {
	d, e := syscall.LoadDLL(name)
	if e != nil {
		t.Fatal(e)
	}
	return &DLL{DLL: d, t: t}
}

func (d *DLL) Proc(name string) *syscall.Proc {
	p, e := d.FindProc(name)
	if e != nil {
		d.t.Fatal(e)
	}
	return p

package main

import (
	"os"
	"syscall"
)

func main() {
	dll := syscall.MustLoadDLL("veh.dll")
	RaiseNoExcept := dll.MustFindProc("RaiseNoExcept")
	ThreadRaiseNoExcept := dll.MustFindProc("ThreadRaiseNoExcept")

	thread := len(os.Args) > 1 && os.Args[1] == "thread"
	if !thread {
		RaiseNoExcept.Call()
	} else {
		ThreadRaiseNoExcept.Call()
	}

	testenv.MustHaveCGO(t)
	testenv.MustHaveExecPath(t, "gcc")
	testprog.Lock()
	defer testprog.Unlock()
	dir := t.TempDir()

	// build go dll
	dll := filepath.Join(dir, "testwinlib.dll")
	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", dll, "-buildmode", "c-shared", "testdata/testwinlib/main.go")
	out, err := testenv.CleanCmdEnv(cmd).CombinedOutput()
	if err != nil {

//go:cgo_import_dynamic runtime._CreateWaitableTimerA CreateWaitableTimerA%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._CreateWaitableTimerExW CreateWaitableTimerExW%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._DuplicateHandle DuplicateHandle%7 "kernel32.dll"
//go:cgo_import_dynamic runtime._ExitProcess ExitProcess%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._FreeEnvironmentStringsW FreeEnvironmentStringsW%1 "kernel32.dll"

                   Position=0)]
        [string]$dll,
 
        # Param2 help description
        [Parameter(Mandatory=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=1)]
        [string]
        $methodSignature
    )
 
    $script:nativeMethods += [PSCustomObject]@{ Dll = $dll; Signature = $methodSignature; }
}
function Get-Win32LastError
{