launch gdb and print out variable value using ruby

Question

I want to write a ruby program that could inspect the variable value of a program by launch the gdb and then print that value. How could I achieve this?

If I were in the shell, I would do this :

  shell > gdb test
  [...gbd started]
  (gdb) p variable
  $1 = 20
  (gdb)

I also like to hear other ways that can achieve the same goal, not necessaliy to use gdb.

Did my answer help? Any followup questions I can help answer? Did open4 give you what you needed? — Sam Post, Feb 03 '10 at 06:11
Sam, open4 is helpful but I have not been successful in using it to solve my problem. I will accept you answer if there will be no other answers. — pierrotlefou, Feb 03 '10 at 07:55

score 2 · Accepted Answer · answered Jan 14 '10 at 07:53

Try open4, which allows you to open stdin, stdout, stderr to an arbitrary command. You could use open4 to run gdb exactly as you describe, I have done this personally and it works quite nicely. Might want to create a wrapper class that handles running commands and returning status, as open4 just gives you file handles.

launch gdb and print out variable value using ruby

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