Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Manual de usuario descargar pdf (Pagina 18)

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

3.3. Run the Executable

To run the program, use the following example:

./hello

The program generates

hello world!

3 + 4 = 7

and returns when the program exits.

3.4. Debug the Executable

To start GDB, use the following commands:

gdb hello

After the initial copyright and conﬁguration information, GDB returns its own prompt, (gdb). The

following is a sample debugging session:

1. To set a breakpoint, type:

break main

The following output displays:

Breakpoint 1 at 0x132: file hello.c, line 15.

Note the exact address and line number may vary, depending upon the target architecture being

debugged and the exact layout of the C code in the hello.c ﬁle.

2. To run the program, type:

run

The following output displays (when the program stops at a breakpoint):

Starting program: hello

Breakpoint 1, main () at hello.c:15

15 a = 3;

Again note that the exact line number and instruction displayed is dependent upon the source

code layout.

3. To print the value of variable, a, type:

print a

The following output displays:

$1 = 0

4. To execute the next command, type next:

The following output displays:

16 b = 4;

5. To display the value of a again, type:

print a

The following output displays:

$2 = 3

6. To display the program being debugged, type:

list

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24

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Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Manual de usuario Pagina 18