Help with gdb

[Saggy]

I'm trying to debug a function that is in another source file than main.c, called init.c, how can I instruct gdb to add a breakpoint at line 15 of a function in init.c named init()?

[K^2]

I don't know about GDB, but you can always trace it manually in the debugger. The source file doesn't matter. You just need to know when a function that interests you is getting called. Then you can find the line you want by reading through ASM code yourself (15 lines of C to ASM isn't all that much) or you can put a call to a useless function that would be easy to recognize. Most debuggers will recognize a call to a standard function like printf.

[Saggy]

I don't know about GDB, but you can always trace it manually in the debugger. The source file doesn't matter. You just need to know when a function that interests you is getting called. Then you can find the line you want by reading through ASM code yourself (15 lines of C to ASM isn't all that much) or you can put a call to a useless function that would be easy to recognize. Most debuggers will recognize a call to a standard function like printf.

I actually use to do it similar to that, but from time to time I'd find that some part of the code that happened later in the text, happened before-hand in the machine code for some reason, which is when I started using gdb. I really can't cite a specific example, but it happened once or twice.

 

In any case, your mention of debuggers reocngize calls to standard functions... It just so happens gdb can add a breakpoint to a function name, so I just did

 

 

b init

 

 

and after that I could do b line_number for whatever line it was in the function I needed to stop on.

 

Finished the program too, and then realized I could do what I wanted with *nix's "sort" command with "sort -R". Oh well, at least I got some practice programming, figured out how to do something I've been meaning to for a while.

[K^2]

The order of operations can be switched some times, but the order of lines cannot be. If you put a call to known function before the line that interests you, code for that line will always immediately follow the call.