errno := fd_fdstat_get(int32(fd), unsafe.Pointer(&stat))
	return uint32(stat.fdflags), errnoErr(errno)
}

// fd_fdstat_get_type is accessed from net
//go:linkname fd_fdstat_get_type

func fd_fdstat_get_type(fd int) (uint8, error) {
	var stat fdstat
	errno := fd_fdstat_get(int32(fd), unsafe.Pointer(&stat))
	return stat.filetype, errnoErr(errno)
}

type preopentype = uint8

const (

		err = errnoErr(Errno(ret))
	}
	return
}

var cgo_libc_setuid unsafe.Pointer // non-nil if cgo linked.

func Setuid(uid int) (err error) {
	if cgo_libc_setuid == nil {
		if _, _, e1 := AllThreadsSyscall(sys_SETUID, uintptr(uid), 0, 0); e1 != 0 {
			err = errnoErr(e1)
		}
	} else if ret := cgocaller(cgo_libc_setuid, uintptr(uid)); ret != 0 {
		err = errnoErr(Errno(ret))
	}

func init() {
	execveDarwin = execve
}

func fdopendir(fd int) (dir uintptr, err error) {
	r0, _, e1 := syscallPtr(abi.FuncPCABI0(libc_fdopendir_trampoline), uintptr(fd), 0, 0)
	dir = r0
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_fdopendir_trampoline()

//go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib"

func readlen(fd int, buf *byte, nbuf int) (n int, err error) {

	if r1 == socket_error {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return err
}

func WSARecvMsg(fd syscall.Handle, msg *WSAMsg, bytesReceived *uint32, overlapped *syscall.Overlapped, croutine *byte) error {

	runtimeCtx uintptr
}

var serverInit sync.Once

func (pd *pollDesc) init(fd *FD) error {
	serverInit.Do(runtime_pollServerInit)
	ctx, errno := runtime_pollOpen(uintptr(fd.Sysfd))
	if errno != 0 {
		return errnoErr(syscall.Errno(errno))
	}
	pd.runtimeCtx = ctx
	return nil
}

func (pd *pollDesc) close() {
	if pd.runtimeCtx == 0 {
		return
	}
	runtime_pollClose(pd.runtimeCtx)
	pd.runtimeCtx = 0
}

	if ($plan9 && $ret[2] eq "e1") {
		$text .= "\tif int32(r0) == -1 {\n";
		$text .= "\t\terr = e1\n";
		$text .= "\t}\n";
	} elsif ($do_errno) {
		$text .= "\tif e1 != 0 {\n";
		$text .= "\t\terr = errnoErr(e1)\n";
		$text .= "\t}\n";
	}
	$text .= "\treturn\n";
	$text .= "}\n\n";
	if($libc) {
		if (not exists $trampolines{$funcname}) {
			$trampolines{$funcname} = 1;