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The problem might be that there is no return for the num function. You can correct
this without leaving the debugger.
4. Set a break point at main:
(gdb) b main
Breakpoint 1 at 0x23f8: file sum.c, line 11.
5. Run the program:
(gdb) run
Starting program: /tmp/hmc/mysum
Breakpoint 1, main () at sum.c:11
11 int num = 10;
6. When the program stops at the break point, use the edit command to make
changes to the source file.
Because you are going to edit the current file, you do not need to specify a source
file name.
(gdb) edit
The edit command opens a new terminal session using your environment variable
settings for terminal and editor. The debugger automatically loads the source file.
7. Make the necessary changes. In this case, add:
return total;
to the function named num.
8. Save the edited source file and exit the editor. This saves the changes in the actual
source file for the program.
9. Use the fix command to recompile the program to see the results of the changes:
(gdb) fix
Compiling /dev/src/sum.c...
Linking...
Applying code changes to sum.c.
Fix succeeded.
The fix command creates a new executable that includes the changes you made
to the source file.
The debugger automatically uses the new executable and picks up the debugging
session where you stopped before using the edit command.
For example, you can continue stepping through the program and you will nd the
new return total; statement in the source view. You can print the value of
total, and see that the result is 110.
14.7 Fix and continue debugging 149