Programming in C

402 Chapter 18 Debugging Programs

newdate->day = 15;

newdate->year = 2004;

today = foo (today);

free (newdate);

return 0;

}

In the sample session for Program 18.5, your output might be slightly different, depend-

ing on which version and on what system you are running gdb.

Program 18.5 gdbSession

$ gcc -g p18-5.c

$ gdb a.out

GNU gdb 5.3-20030128 (Apple version gdb-309) (Thu Dec 4 15:41:30 GMT 2003)

Copyright 2003 Free Software Foundation, Inc.

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB. Type "show warranty" for details.

This GDB was configured as "powerpc-apple-darwin".

Reading symbols for shared libraries .. done

(gdb) list main

14

15 return x;

16 }

17

18 int main (void)

19 {

20 struct date today = {10, 11, 2004};

21 int array[5] = {1, 2, 3, 4, 5};

22 struct date *newdate, foo ();

23 char *string = "test string";

(gdb) break main Set breakpoint in main

Breakpoint 1 at 0x1ce8: file p18-5.c, line 20.

(gdb) run Start program execution

Starting program: /Users/stevekochan/MySrc/c/a.out

Reading symbols for shared libraries. done

Breakpoint 1, main () at p18-5.c:20

20 struct date today = {10, 11, 2004};

(gdb) step Execute line 20

Program 18.5 Continued