NEW JOB OPENING

Employer’s Name: GDB International, Inc.

Debugging with gdb The gnu Source-Level Debugger Tenth Edition, for gdb version 12.0.6-git (GDB) Richard Stallman, Roland Pesch, Stan Shebs, et al. Gdb comes with a powerful scripting interface for python. The kernel provides a collection of helper scripts that can simplify typical kernel debugging steps. This is a short tutorial about how to enable and use them. It focuses on QEMU/KVM virtual machines as target, but the examples can be transferred to the other gdb stubs as well. A GDB file is a database file created by MapSource, a GPS route editing and trip-planning application. It contains waypoints, routes, and tracks that can be transferred to a Garmin navigation device. GDB files are similar to the universally transferrable.GPX files.

Position & Job Description:

1. Supply Chain Analyst – New Brunswick, NJ – Analyze product delivery and supply chain process to identify and recommend changes. Test warehouse management systems. Research and analyze supply chain activities; develop and implement solutions to reduce supply chain costs and improve efficiencies; analyze and interpret business data. Associate’s degree in Business/Commerce or equivalent, 2 years experience. Send resume: 1 Home News Row, New Brunswick, NJ 08901.
2. Sr. Scientist, Research & Development – Nashville, IL – Conduct chemical analysis and experiments to improve or develop new paint formulations. Develop, monitor and implement management operations systems. Manage paint production. Recommend changes to the chemistry of paints by identifying compounds and additives. Perform re-sampling and analysis. Develop new application through chemical variations in paint. Rework batches, color and quality monitoring.

Eligibility: PhD in Chemistry, 1 year experience.

3. Business Development Manager – New Brunswick, NJ – Research international paint market conditions and plan, develop and implement business strategy. Manage the marketing and company paint brand. Evaluate and design sales and marketing systems. Analyze company portfolio and identify new business opportunities internationally. Introduce new products to increase sales. Will travel internationally (mainly to China and India) to meet customers at least once a month.

Eligibility: Master’s degree in Business Administration, 1 year experience.

4. Sr. Scientist – Nashville, IL – Conduct chemical analysis and experiments to improve or develop new paint formulations. Introduce and implement paint formulation techniques. Recommend changes to the chemistry of paints by identifying compounds and additives. Review plant production trials and observe the quality improvement stages. Perform re-sampling and analysis. Develop new applications through chemical variations in paint. Rework batches, color and quality monitoring. Test paint using ASTM Standards.

Eligibility: Master’s degree in Chemical Technology and 1 year experience or Bachelor’s degree plus 5 years experience.

APPLY TO:
GDB International, Inc.
Attn: HR/Recruitment
One Home News Row
New Brunswick, NJ 08901

This Tutorial is taken from here

In this article, let us discuss how to debug a c program using gdb debugger in 6 simple steps.

Write a sample C program with errors for debugging purpose

To learn C program debugging, let us create the following C program that calculates and prints the factorial of a number. However this C program contains some errors in it for our debugging purpose.

Let us debug it while reviewing the most useful commands in gdb.

Step 1. Compile the C program with debugging option -g

Compile your C program with -g option. This allows the compiler to collect the debugging information.

Note: The above command creates a.out file which will be used for debugging as shown below.

Step 2. Launch gdb

Launch the C debugger (gdb) as shown below.

Step 3. Set up a break point inside C program

Other formats:

break [file_name]:line_number
break [file_name]:func_name

Places break point in the C program, where you suspect errors. While executing the program, the debugger will stop at the break point, and gives you the prompt to debug.

So before starting up the program, let us place the following break point in our program.

Step 4. Execute the C program in gdb debugger

You can start running the program using the run command in the gdb debugger. You can also give command line arguments to the program via run args. The example program we used here does not requires any command line arguments so let us give run, and start the program execution.

Once you executed the C program, it would execute until the first break point, and give you the prompt for debugging.

You can use various gdb commands to debug the C program as explained in the sections below.

Step 5. Printing the variable values inside gdb debugger

As you see above, in the factorial.c, we have not initialized the variable j. So, it gets garbage value resulting in a big numbers as factorial values.

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Fix this issue by initializing variable j with 1, compile the C program and execute it again.

Even after this fix there seems to be some problem in the factorial.c program, as it still gives wrong factorial value.

So, place the break point in 10th line, and continue as explained in the next section.

Step 6. Continue, stepping over and in – gdb commands

RMS's Gdb Tutorial: How Do I Use Breakpoints?

There are three kind of gdb operations you can choose when the program stops at a break point. They are continuing until the next break point, stepping in, or stepping over the next program lines.

c or continue: Debugger will continue executing until the next break point.
n or next: Debugger will execute the next line as single instruction.
s or step: Same as next, but does not treats function as a single instruction, instead goes into the function and executes it line by line.

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By continuing or stepping through you could have found that the issue is because we have not used the <= in the ‘for loop’ condition checking. So changing that from < to <= will solve the issue.

Gdbenefits.com

gdb command shortcuts

Use following shortcuts for most of the frequent gdb operations.

Getting Started With Debugging | Find Bugs In Your C Using GDB

l – list
p – print
c – continue
s – step
ENTER: pressing enter key would execute the previously executed command again.

What Is The Difference Between LLDB And GDB - Pediaa.Com

Miscellaneous gdb commands

l command: Use gdb command l or list to print the source code in the debug mode. Use l line-number to view a specific line number (or) l function to view a specific function.
bt: backtrack – Print backtrace of all stack frames, or innermost COUNT frames.
help – View help for a particular gdb topic — help TOPICNAME.
quit – Exit from the gdb debugger.