Specs

getn(
  device() | chardata() | String.Chars.t(),
  pos_integer() | chardata() | String.Chars.t()
) :: chardata() | nodata()

Gets a number of bytes from IO device :stdio.

If :stdio is a Unicode device, count implies the number of Unicode code points to be retrieved. Otherwise, count is the number of raw bytes to be retrieved.

See IO.getn/3 for a description of return values.

Specs

getn(device(), chardata() | String.Chars.t(), pos_integer()) ::
  chardata() | nodata()

Gets a number of bytes from the IO device.

If the IO device is a Unicode device, count implies the number of Unicode code points to be retrieved. Otherwise, count is the number of raw bytes to be retrieved.

It returns:

• data - the input characters

• :eof - end of file was encountered

• {:error, reason} - other (rare) error condition; for instance, {:error, :estale} if reading from an NFS volume