b := make([]byte, len)
		err := getcwd(&b[0], len)
		if err == nil {
			i := 0
			for b[i] != 0 {
				i++
			}
			return string(b[0:i]), nil
		}
		if err != ERANGE {
			return "", err
		}
	}
}

func Getcwd(buf []byte) (n int, err error) {
	err = getcwd(&buf[0], uint64(len(buf)))
	if err == nil {
		i := 0
		for buf[i] != 0 {
			i++
		}

	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{35, "EDEADLK", "resource deadlock avoided"},
	{36, "ENAMETOOLONG", "file name too long"},
	{37, "ENOLCK", "no locks available"},
	{38, "ENOSYS", "function not implemented"},

	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{35, "EDEADLK", "resource deadlock avoided"},
	{36, "ENAMETOOLONG", "file name too long"},
	{37, "ENOLCK", "no locks available"},
	{38, "ENOSYS", "function not implemented"},

	AT_EMPTY_PATH                   = 0x1000
	AT_REMOVEDIR                    = 0x200
	RENAME_NOREPLACE                = 1 << 0
)

const (
	EDOM               = Errno(1)
	ERANGE             = Errno(2)
	EACCES             = Errno(111)
	EAGAIN             = Errno(112)
	EBADF              = Errno(113)
	EBUSY              = Errno(114)
	ECHILD             = Errno(115)

	var nwritten size
	errno := path_readlink(
		dirFd,
		pathPtr,
		pathLen,
		unsafe.Pointer(&buf[0]),
		size(len(buf)),
		unsafe.Pointer(&nwritten),
	)
	// For some reason wasmtime returns ERANGE when the output buffer is
	// shorter than the symbolic link value. os.Readlink expects a nil
	// error and uses the fact that n is greater or equal to the buffer
	// length to assume that it needs to try again with a larger size.

	EPERM           = Errno(0x1)
	EPFNOSUPPORT    = Errno(0x7b)
	EPIPE           = Errno(0x20)
	EPROTO          = Errno(0x47)
	EPROTONOSUPPORT = Errno(0x78)
	EPROTOTYPE      = Errno(0x62)
	ERANGE          = Errno(0x22)
	EREMCHG         = Errno(0x52)
	EREMOTE         = Errno(0x42)
	ERESTART        = Errno(0x5b)
	EROFS           = Errno(0x1e)
	ESHUTDOWN       = Errno(0x8f)
	ESOCKTNOSUPPORT = Errno(0x79)

	EPROCUNAVAIL    = Errno(0x4c)
	EPROGMISMATCH   = Errno(0x4b)
	EPROGUNAVAIL    = Errno(0x4a)
	EPROTO          = Errno(0x5f)
	EPROTONOSUPPORT = Errno(0x2b)
	EPROTOTYPE      = Errno(0x29)
	ERANGE          = Errno(0x22)
	EREMOTE         = Errno(0x47)
	EROFS           = Errno(0x1e)
	ERPCMISMATCH    = Errno(0x49)
	ESHUTDOWN       = Errno(0x3a)
	ESOCKTNOSUPPORT = Errno(0x2c)
	ESPIPE          = Errno(0x1d)

	EPROCUNAVAIL    = Errno(0x4c)
	EPROGMISMATCH   = Errno(0x4b)
	EPROGUNAVAIL    = Errno(0x4a)
	EPROTO          = Errno(0x5f)
	EPROTONOSUPPORT = Errno(0x2b)
	EPROTOTYPE      = Errno(0x29)
	ERANGE          = Errno(0x22)
	EREMOTE         = Errno(0x47)
	EROFS           = Errno(0x1e)
	ERPCMISMATCH    = Errno(0x49)
	ESHUTDOWN       = Errno(0x3a)
	ESOCKTNOSUPPORT = Errno(0x2c)
	ESPIPE          = Errno(0x1d)

	ENOTBLK     = syscall.Errno(0xf)
	ENOTDIR     = syscall.Errno(0x14)
	ENOTTY      = syscall.Errno(0x19)
	ENXIO       = syscall.Errno(0x6)
	EPERM       = syscall.Errno(0x1)
	EPIPE       = syscall.Errno(0x20)
	ERANGE      = syscall.Errno(0x22)
	EROFS       = syscall.Errno(0x1e)
	ESPIPE      = syscall.Errno(0x1d)
	ESRCH       = syscall.Errno(0x3)
	ETXTBSY     = syscall.Errno(0x1a)
	EWOULDBLOCK = syscall.Errno(0xb)

func GetsockoptString(fd, level, opt int) (string, error) {
	buf := make([]byte, 256)
	vallen := _Socklen(len(buf))
	err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
	if err != nil {
		if err == ERANGE {
			buf = make([]byte, vallen)
			err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
		}
		if err != nil {
			return "", err
		}
	}
	return ByteSliceToString(buf[:vallen]), nil