module Net::SSH::BufferedIo

def fill(n = 8192)

if no data was available to be read.
the data to the input buffer. It returns the number of bytes read, or 0
Tries to read up to +n+ bytes of data from the remote end, and appends 
def fill(n = 8192)
  input.consume!
  data = recv(n) || ""
  debug { "read #{data.length} bytes" }
  input.append(data)
  return data.length
rescue EOFError => e
  @input_errors << e
  return 0
end