Procs

proc tcgetattr(fd: int): tuple[iflag, oflag, cflag, lflag, ispeed, ospeed: int,
                               cc: seq[string]] {.
    ...raises: [Exception, ValueError, OSError, IOError, EOFError, KeyError],
    tags: [RootEffect].}

proc tcsendbreak(fd, duration: int) {....raises: [Exception, ValueError, OSError,
    IOError, EOFError, KeyError], tags: [RootEffect].}

proc tcdrain(fd: int) {....raises: [Exception, ValueError, OSError, IOError,
                                 EOFError, KeyError], tags: [RootEffect].}