Altering (Debugging with GDB)

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17 Altering Execution

Once you think you have found an error in your program, you might want to find out for certain whether correcting the apparent error would lead to correct results in the rest of the run. You can find the answer by experiment, using the GDB features for altering execution of the program.

For example, you can store new values into variables or memory locations, give your program a signal, restart it at a different address, or even return prematurely from a function.

Assignment:    Assignment to variables
Jumping:    Continuing at a different address
Signaling:    Giving your program a signal
Returning:    Returning from a function
Calling:    Calling your program’s functions
Patching:    Patching your program
Compiling and Injecting Code:    Compiling and injecting code in GDB