}

func readArg(s string) (arg string, value uint64, rest string, err error) {
	var tok string
	tok, rest = readToken(s)
	if len(tok) == 0 {
		return "", 0, s, fmt.Errorf("no argument")
	}
	parts := strings.SplitN(tok, "=", 2)
	if len(parts) < 2 {
		return "", 0, s, fmt.Errorf("malformed argument: %q", tok)
	}
	arg = parts[0]
	value, err = strconv.ParseUint(parts[1], 10, 64)
	if err != nil {

	} else {
		Args = commandLineToArgv(cmd)
	}
}

// appendBSBytes appends n '\\' bytes to b and returns the resulting slice.
func appendBSBytes(b []byte, n int) []byte {
	for ; n > 0; n-- {
		b = append(b, '\\')
	}
	return b
}

// readNextArg splits command line string cmd into next
// argument and command line remainder.
func readNextArg(cmd string) (arg []byte, rest string) {
	var b []byte

	cmd := exec.Command("go", "tool", "link", "-B", buildid)
	out, err := cmd.CombinedOutput()
	if err == nil {
		log.Fatalf("expected cmd/link to fail")
	}

	firstLine := string(bytes.SplitN(out, []byte("\n"), 2)[0])
	if strings.HasPrefix(firstLine, "panic") {
		log.Fatalf("cmd/link panicked:\n%s", out)
	}

	if !strings.Contains(firstLine, message) {

// splice wraps the splice system call. Since the current implementation
// only uses splice on sockets and pipes, the offset arguments are unused.
// splice returns int instead of int64, because callers never ask it to
// move more data in a single call than can fit in an int32.
func splice(out int, in int, max int, flags int) (int, error) {
	n, err := syscall.Splice(in, nil, out, nil, max, flags)
	return int(n), err
}

		}
	} else {
		r = src
	}
	// Now call ReadFrom (through io.Copy), which will hopefully call poll.Splice
	n, err := io.Copy(dst, r)
	if err != nil {
		t.Fatal(err)
	}

	// We should have called poll.Splice with the right file descriptor arguments.
	if n > 0 && !hook.called {
		t.Fatal("expected to called poll.Splice")
	}
	if hook.called && hook.dstfd != int(dst.Fd()) {

//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys	setfsgid(gid int) (prev int, err error)
//sys	setfsuid(uid int) (prev int, err error)
//sys	Shutdown(fd int, how int) (err error)
//sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
//sys	Stat(path string, stat *Stat_t) (err error)
//sys	Statfs(path string, buf *Statfs_t) (err error)

//sys	Setfsgid(gid int) (err error)
//sys	Setfsuid(uid int) (err error)
//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
//sys	Shutdown(fd int, how int) (err error)
//sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
//sys	Stat(path string, stat *Stat_t) (err error)
//sys	Statfs(path string, buf *Statfs_t) (err error)

//
//go:linkname _cgo_munmap _cgo_munmap
var _cgo_munmap unsafe.Pointer

// mmap is used to route the mmap system call through C code when using cgo, to
// support sanitizer interceptors. Don't allow stack splits, since this function
// (used by sysAlloc) is called in a lot of low-level parts of the runtime and
// callers often assume it won't acquire any locks.
//
//go:nosplit

//
// Other packages in std that also import [internal/poll] (such as os)
// can use a type assertion to access this extension method so that
// they can pass the *poll.FD to functions like poll.Splice.
//
// PollFD is not intended for use outside the standard library.
func (c *rawConn) PollFD() *poll.FD {
	if !c.ok() {
		return nil
	}
	return &c.fd.pfd
}

func newRawConn(fd *netFD) *rawConn {

	// Now call WriteTo (through io.Copy), which will hopefully call poll.SendFile
	n, err := io.Copy(dst, src)
	if err != nil {
		t.Fatalf("io.Copy error: %v", err)
	}

	// We should have called poll.Splice with the right file descriptor arguments.
	if n > 0 && !hook.called {
		t.Fatal("expected to called poll.SendFile")
	}
	if hook.called && hook.srcfd != int(src.Fd()) {