Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Manuale Utente Scaricare il pdf (Pagina 19)

Chapter 3. Developing with Red Hat Enterprise Linux Developer Tools 15

The following output displays:

12 int

13 main (void)

14 {

15 int b;

17 a = 3;

18 b = 4;

20 printf ("Hello, world!\n");

22 foo (b);

24 return 0;

25 }

7. To list a speciﬁc function code, use the list command with the name of the function to be

display. For example, type:

list foo

The following output displays:

1 #include <stdio.h>

3 int a, c;

5 static void

6 foo (int b)

7 {

8 c = a + b;

9 printf ("%d + %d = %d\n", a, b, c);

10 }

8. To set a breakpoint at line seven, enter the following input (set a breakpoint at any line by

entering break linenumber, where linenumber is the speciﬁc line number to break):

break 8

The following output displays:

Breakpoint 2 at 0xf4: file hello.c, line 8.

9. To resume normal execution of the program until the next breakpoint, type:

continue

The following output displays:

Continuing.

Hello, world!

Breakpoint 2, foo (b=4) at hello.c:8

8 c = a + b;

10. To step to the next instruction and execute it, type:

step

The following output displays:

9 printf ("%d + %d = %d\n", a, b, c);

11. To display the value of c, type:

print c

The following output displays:

$3 = 7

12. To see how you got to where you are, type:

backtrace

The following output displays:

#0 foo (b=4) at hello.c:9

1 2 ... 14 15 16 17 18 19 20 21 22 23 24

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