proc acceptConn(a1: cint; a2: ptr SockAddr; a3: ptr SockLen;
                a4: set[DescriptorFlag]): Result[cint, OSErrorCode] {.
    ...raises: [], tags: [], forbids: [].}

proc closeFd(s: cint): int {....raises: [], tags: [], forbids: [].}

proc closeFd(s: SocketHandle): int {....raises: [], tags: [], forbids: [].}

proc createOsPipe(readset, writeset: set[DescriptorFlag]): Result[
    tuple[read: cint, write: cint], OSErrorCode] {....raises: [], tags: [],
    forbids: [].}

proc getDescriptorInheritance(s: cint): Result[bool, OSErrorCode] {....raises: [],
    tags: [], forbids: [].}

proc setDescriptorBlocking(s: cint; value: bool): Result[void, OSErrorCode] {.
    ...raises: [], tags: [], forbids: [].}

proc setDescriptorBlocking(s: SocketHandle; value: bool): Result[void,
    OSErrorCode] {....raises: [], tags: [], forbids: [].}

proc setDescriptorFlags(s: cint; nonblock, cloexec: bool): Result[void,
    OSErrorCode] {....raises: [], tags: [], forbids: [].}

proc setDescriptorInheritance(s: cint; value: bool): Result[void, OSErrorCode] {.
    ...raises: [], tags: [], forbids: [].}

template handleEintr(body: untyped): untyped {..}