// Errno values.
var (
	errEAGAIN error = EAGAIN
	errEINVAL error = EINVAL
	errENOENT error = ENOENT
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e Errno) error {
	switch e {
	case 0:
		return nil
	case EAGAIN:
		return errEAGAIN
	case EINVAL:
		return errEINVAL
	case ENOENT:
		return errENOENT

	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
}

// Errno values.
var (
	errEAGAIN error = EAGAIN
	errEINVAL error = EINVAL
	errENOENT error = ENOENT
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e Errno) error {
	switch e {
	case 0:
		return nil
	case EAGAIN:
		return errEAGAIN
	case EINVAL:
		return errEINVAL
	case ENOENT:
		return errENOENT

	_, _, e1 := Syscall6(SYS_ARM_FADVISE64_64, uintptr(fd), uintptr(advice), uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

//sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)

func Fstatfs(fd int, buf *Statfs_t) (err error) {

	_, _, e1 := Syscall6(SYS_FADVISE64_64, uintptr(fd), uintptr(advice), uintptr(offset>>32), uintptr(offset), uintptr(length>>32), uintptr(length))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func seek(fd int, offset int64, whence int) (int64, syscall.Errno) {
	var newoffset int64
	offsetLow := uint32(offset & 0xffffffff)
	offsetHigh := uint32((offset >> 32) & 0xffffffff)

		$text .= "\t$call\n";
	} else {
		$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
	}
	$text .= $body;

	if ($do_errno) {
		$text .= "\tif e1 != 0 {\n";
		$text .= "\t\terr = errnoErr(e1)\n";
		$text .= "\t}\n";
	}
	$text .= "\treturn\n";
	$text .= "}\n";
}

if($errors) {
	exit 1;
}

# TODO: this assumes tags are just simply comma separated. For now this is all the uses.

	errEINVAL error = syscall.EINVAL
	errENOENT error = syscall.ENOENT
)

var (
	signalNameMapOnce sync.Once
	signalNameMap     map[string]syscall.Signal
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return nil
	case EAGAIN:
		return errEAGAIN
	case EINVAL:
		return errEINVAL
	case ENOENT:
		return errENOENT

	mmap_args := [6]uintptr{addr, length, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(offset)}
	r0, _, e1 := Syscall(SYS_MMAP, uintptr(unsafe.Pointer(&mmap_args[0])), 0, 0)
	xaddr = uintptr(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// On s390x Linux, all the socket calls go through an extra indirection.
// The arguments to the underlying system call (SYS_SOCKETCALL) are the

	if err != nil {
		return err
	}
	if nonblocking {
		flags |= FDFLAG_NONBLOCK
	} else {
		flags &^= FDFLAG_NONBLOCK
	}
	errno := fd_fdstat_set_flags(int32(fd), flags)
	return errnoErr(errno)
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

const (
	RLIMIT_NOFILE = iota
)

func Getrlimit(which int, lim *Rlimit) error {
	return ENOSYS