NoSetGroups bool     // If true, don't set supplementary groups
}

// ProcAttr holds attributes that will be applied to a new process started
// by [StartProcess].
type ProcAttr struct {
	Dir   string    // Current working directory.
	Env   []string  // Environment.
	Files []uintptr // File descriptors.
	Sys   *SysProcAttr
}

var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr

var (
	Interrupt Signal = syscall.Note("interrupt")
	Kill      Signal = syscall.Note("kill")
)

func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
	sysattr := &syscall.ProcAttr{
		Dir: attr.Dir,
		Env: attr.Env,
		Sys: attr.Sys,
	}

	sysattr.Files = make([]uintptr, 0, len(attr.Files))
	for _, f := range attr.Files {

	"math"
	. "os"
	"runtime"
	"syscall"
	"testing"
)

func TestErrProcessDone(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	t.Parallel()

	p, err := StartProcess(testenv.GoToolPath(t), []string{"go"}, &ProcAttr{})
	if err != nil {
		t.Fatalf("starting test process: %v", err)
	}
	p.Wait()
	if got := p.Signal(Kill); got != ErrProcessDone {
		t.Errorf("got %v want %v", got, ErrProcessDone)
	}
}

	name   *byte
	value  *byte
	nvalue int
}

type ProcAttr struct {
	Dir   string    // Current working directory.
	Env   []string  // Environment.
	Files []uintptr // File descriptors.
	Sys   *SysProcAttr
}

type SysProcAttr struct {
	Rfork int // additional flags to pass to rfork
}

var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr

	"testing"
)

func TestExecPtrace(t *testing.T) {
	testenv.MustHaveExec(t)

	bin, err := exec.LookPath("sh")
	if err != nil {
		t.Skipf("skipped because sh is not available")
	}

	attr := &os.ProcAttr{
		Sys: &syscall.SysProcAttr{
			Ptrace: true,
		},
	}
	proc, err := os.StartProcess(bin, []string{bin}, attr)
	if err == nil {
		proc.Kill()
	}
	if err != nil && !os.IsPermission(err) {

	for _, e := range os.Environ() {
		if strings.HasPrefix(e, "GODEBUG=") || strings.HasPrefix(e, "GOTRACEBACK=") {
			continue
		}
		env = append(env, e)
	}

	proc, err := os.StartProcess(fdsBin, []string{fdsBin}, &os.ProcAttr{
		Env:   env,
		Files: []*os.File{},
	})
	if err != nil {
		t.Fatal(err)
	}
	ps, err := proc.Wait()
	if err != nil {
		t.Fatal(err)
	}
	if ps.ExitCode() != 0 {

	if err := os.CheckPidfdOnce(); err != nil {
		// Non-pidfd code paths tested in exec_unix_test.go.
		t.Skipf("skipping: pidfd not available: %v", err)
	}

	p, err := os.StartProcess(testenv.GoToolPath(t), []string{"go"}, &os.ProcAttr{})
	if err != nil {
		t.Fatalf("starting test process: %v", err)
	}
	p.Wait()

	// Use pid of a non-existing process.
	proc, err := os.FindProcess(p.Pid)
	// FindProcess should never return errors on Unix.

// sending a signal.
var (
	Interrupt Signal = syscall.SIGINT
	Kill      Signal = syscall.SIGKILL
)

func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
	// If there is no SysProcAttr (ie. no Chroot or changed
	// UID/GID), double-check existence of the directory we want
	// to chdir into. We can make the error clearer this way.

}

var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr

func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
	if len(argv0) == 0 {
		return 0, 0, EWINDOWS
	}
	if attr == nil {
		attr = &zeroProcAttr
	}
	sys := attr.Sys

func (w WaitStatus) StopSignal() Signal { return 0 }
func (w WaitStatus) TrapCause() int     { return 0 }

// XXX made up
type Rusage struct {
	Utime Timeval
	Stime Timeval
}

// XXX made up
type ProcAttr struct {
	Dir   string
	Env   []string
	Files []uintptr
	Sys   *SysProcAttr
}

type SysProcAttr struct {
}

func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {