INTERVIEW QUESTIONS PROGRAMMING LANGUAGES CGI PROGRAMMING DETAILS

Question: How can I run my CGI program 'live' in a debugger?

Answer: At First,in the CGI code, at it's start, add "sleep(30);". This will cause the CGI to do nothing for thiry seconds (you may need to adjust this time). Compile the CGI with debuging info ("-g" in gcc) and install the CGI as normal. Next, using your web browser, activate the CGI. It will of course just sit there doing nothing. While it is 'sleeping', find it's PID(ps -a | grep <cgi name>). Load your debugger and attach to that PID("attach <pid>" in gdb). You will also need to tell it where to find the symbol definitions ("symbol-file <cgi>" in gdb). Then set a break point after the invocation of the sleep function and you are ready to debug. Do be aware that your browser will eventually timeout if it doesn't receive anything.

At First,in the CGI code, at it's start, add "sleep(30);". This will cause the CGI to do nothing for thiry seconds (you may need to adjust this time). Compile the CGI with debuging info ("-g" in gcc) and install the CGI as normal. Next, using your web browser, activate the CGI. It will of course just sit there doing nothing. While it is 'sleeping', find it's PID(ps -a | grep <cgi name>). Load your debugger and attach to that PID("attach <pid>" in gdb). You will also need to tell it where to find the symbol definitions ("symbol-file <cgi>" in gdb). Then set a break point after the invocation of the sleep function and you are ready to debug. Do be aware that your browser will eventually timeout if it doesn't receive anything.
Source: CoolInterview.com

If you have the better answer, then send it to us. We will display your answer after the approval.

Rules to Post Answers in CoolInterview.com:-

• There should not be any Spelling Mistakes.
• There should not be any Gramatical Errors.
• Answers must not contain any bad words.
• Answers should not be the repeat of same answer, already approved.
• Answer should be complete in itself.

Name :*
Email Id :*
Answer :*
Verification Code	Not readable? Load New Code
Enter the above shown code: *
	Inform me about updated answers to this question