// Get a pidfd of the current process (opening of "/proc/self" won't
	// work for waitid).
	fd, err := unix.PidFDOpen(syscall.Getpid(), 0)
	if err != nil {
		return NewSyscallError("pidfd_open", err)
	}
	defer syscall.Close(int(fd))

	// Check waitid(P_PIDFD) works.
	for {
		_, _, err = syscall.Syscall6(syscall.SYS_WAITID, _P_PIDFD, fd, 0, syscall.WEXITED, 0, 0)
		if err != syscall.EINTR {
			break
		}
	}

	os.Setenv("GODEBUG", godebug)

	if os.Getenv("GO_EXEC_TEST_PID") != "" {
		return
	}
	if runtime.GOOS == "windows" {
		return
	}
	for fd := uintptr(3); fd <= 100; fd++ {
		if poll.IsPollDescriptor(fd) {
			continue
		}

		if fdtest.Exists(fd) {
			haveUnexpectedFDs = true
			return
		}
	}
}

// TestMain allows the test binary to impersonate many other binaries,

			fdMu.Lock()
			defer fdMu.Unlock()
			if len(fds) == 0 {
				return nil
			}
			fdsCopy := fds
			for _, fd := range fdsCopy {
				// Grab a fallback disk
				fds = fds[1:]
				if fd != nil && fd.IsOnline() {
					return fd
				}
			}
		}
		// Either no more disks for fallback or
		// not a storage error.
		return nil
	}

	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 {
		sysattr.Files = append(sysattr.Files, f.Fd())
	}

	pid, _, e := syscall.StartProcess(name, argv, sysattr)
	if e != nil {
		return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
	}

	return newPIDProcess(pid), nil
}

		sysattr.Env, err = execenv.Default(sysattr.Sys)
		if err != nil {
			return nil, err
		}
	}
	sysattr.Files = make([]uintptr, 0, len(attr.Files))
	for _, f := range attr.Files {
		sysattr.Files = append(sysattr.Files, f.Fd())
	}

	pid, h, e := syscall.StartProcess(name, argv, sysattr)

	// Make sure we don't run the finalizers of attr.Files.
	runtime.KeepAlive(attr)

	if e != nil {

	// but in line with the uploader, log to a file in debug
	// only if that directory was created by the user.
	fd, err := os.Stat(telemetry.Default.DebugDir())
	if err != nil {
		if !os.IsNotExist(err) {
			log.Fatalf("failed to stat debug directory: %v", err)
		}
	} else if fd.IsDir() {
		// local/debug exists and is a directory. Set stderr to a log file path
		// in local/debug.

			pathErr.Path = parentDir + string(PathSeparator) + pathErr.Path
			err = pathErr
		}
		return err
	}
	return nil
}

func removeAllFrom(parent *File, base string) error {
	parentFd := int(parent.Fd())
	// Simple case: if Unlink (aka remove) works, we're done.
	err := ignoringEINTR(func() error {
		return unix.Unlinkat(parentFd, base, 0)
	})
	if err == nil || IsNotExist(err) {
		return nil
	}

	IFLA_CAN_BITRATE_CONST        = 0xd
	IFLA_CAN_DATA_BITRATE_CONST   = 0xe
	IFLA_CAN_BITRATE_MAX          = 0xf
)

type KCMAttach struct {
	Fd     int32
	Bpf_fd int32
}

type KCMUnattach struct {
	Fd int32
}

type KCMClone struct {
	Fd int32
}

const (
	NL80211_AC_BE                                           = 0x2
	NL80211_AC_BK                                           = 0x3

}`
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		panic(err)
	}

	// Replace the result with call(), which is on the next line.
	fd := file.Decls[0].(*ast.FuncDecl)
	ret := fd.Body.List[0].(*ast.ReturnStmt)
	ret.Results[0] = ret.Results[0].(*ast.CompositeLit).Elts[0]

	var buf bytes.Buffer
	if err := Fprint(&buf, fset, ret); err != nil {
		t.Fatal(err)
	}

		$2 ~ /^HW_MACHINE$/ ||
		$2 ~ /^SYSCTL_VERS/ ||
		$2 !~ "MNT_BITS" &&
		$2 ~ /^(MS|MNT|MOUNT|UMOUNT)_/ ||
		$2 ~ /^NS_GET_/ ||
		$2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
		$2 ~ /^(O|F|[ES]?FD|NAME|S|PTRACE|PT|PIOD|TFD)_/ ||
		$2 ~ /^KEXEC_/ ||
		$2 ~ /^LINUX_REBOOT_CMD_/ ||
		$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
		$2 ~ /^MODULE_INIT_/ ||
		$2 !~ "NLA_TYPE_MASK" &&
		$2 !~ /^RTC_VL_(ACCURACY|BACKUP|DATA)/ &&