How to debug gdb using gdb ?

[Smith John <baseboy126 at gmail dot com>]

hi,guys:

   I am  researching  gdb source code ,  and  I want  to  debug  it
using  its  executable file .
   but  how can I send  command  to  the  debugged  gdb procedure
which is children  process  ,

  as the gdb which is parent process will  deal with every command
inputed from  the command line ,so I get no way to communicate  with

  that debugged gdb procedure.



any advice?


thanks!