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(gdb.info)Altering

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Altering Execution
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   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