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Use debuggers to diagnose segfaults Start your debugger with the command gdb core , and then use the backtrace command to see where the program was when it crashed. This simple trick will allow you to focus on that part of the code.
You can't catch segfaults. Segfaults lead to undefined behavior - period (err, actually segfaults are the result of operations also leading to undefined behavior.
The following are some typical causes of a segmentation fault: Attempting to access a nonexistent memory address (outside process's address space) Attempting to access memory the program does not have rights to (such as kernel structures in process context) Attempting to write read-only memory (such as code segment)
I encountered my first Segmentation Fault today (newbie programmer). After reading up on what a segmentation fault is (Thanks for all of the helpful info on this site, as well as Wikipedia's lengthy explanation), I'm trying to determine the easiest way to go about finding where my fault is occuring. It's written in C and the error is occuring on a *NIX based system (I'm not sure which one to be honest... 99% sure it's Linux). I can't exactly post my code as I have numerous files that I'm compiling that are all quite lengthy. I was just hoping for some best practices you have all observed. Thanks for your help.
P.s. I'm thinking the error is coming from dereferencing a NULL pointer or using an uninitialized pointer. However, I could definitely be wrong.
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