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Running GDB
55
The execution of a stopped program can be resumed in a number of ways. The following are the most
common.
c (continue)
The continue command simply restarts the execution of the program, which will continue to
execute until it encounters a breakpoint, runs into a specified or emergent condition (e.g. an error),
or terminates.
n (next)
Like continue, the next command also restarts execution; however, in addition to the stopping
conditions implicit in the continue command, next will also halt execution at the next sequential
line of code in the current source file.
s (step)
Like next, the step command also halts execution at each sequential line of code in the current
source file. However, if execution is currently stopped at a source line containing a function call,
GDB stops execution after entering the function call (rather than executing it).
fini (finish)
Like the aforementioned commands, the finish command resumes executions, but halts when
execution returns from a function.
Finally, two essential commands:
q (quit)
This terminates the execution.
h (help)
The help command provides access to its extensive internal documentation. The command
takes arguments: help breakpoint (or h br), for example, shows a detailed description
of the breakpoint command. Refer to the help output of each command for more detailed
information.
5.2.2. Running GDB
This section will describe a basic execution of GDB, using the following simple program:
hello.c
#include <stdio.h>
char hello[] = { "Hello, World!" };
int
main()
{
fprintf (stdout, "%s\n", hello);
return (0);
}
The following procedure illustrates the debugging process in its most basic form.
Procedure 5.1. Debugging a 'Hello World' Program
1. Compile hello.c into an executable with the debug flag set, as in:
gcc -g -o hello hello.c
- Red Hat Enterprise Linux 6 1
- Developer Guide 1
- Enterprise Linux 6 3
- Edition 0 3
- 1. Document Conventions 7
- 1.2. Pull-quote Conventions 8
- 1.3. Notes and Warnings 9
- 2.1. Do You Need Help? 9
- 2.2. We Need Feedback! 10
- Introduction to Eclipse 11
- 1.2. Help In Eclipse 13
- 1.3. Development Toolkits 15
- Environment (IDE) 17
- 2.2. Useful Hints 21
- 2.2.2. libhover Plug-in 27
- 2.2.2.1. Setup and Usage 28
- Libraries and Runtime Support 31
- 3.2.1. API Compatibility 32
- 3.2.2. ABI Compatibility 32
- 3.2.3. Policy 32
- 3.2.4. Static Linking 33
- 3.3.1. The GNU C Library 33
- std::vector 37
- elements in any order 37
- 3.3.3. Boost 38
- 3.3.3.1. Boost Updates 39
- 3.3.3.2. Boost Documentation 40
- 3.3.4. Qt 41
- 3.3.4.2. Qt Creator 42
- 3.3.5.1. KDE4 Architecture 42
- 3.3.6. Python 44
- 3.3.7. Java 45
- 3.3.8. Ruby 46
- 3.3.9. Perl 47
- 3.3.9.3. Perl Documentation 48
- Compiling and Building 49
- 4.1.2. Language Compatibility 50
- 4.1.6. Running GCC 53
- 4.1.6.1. Simple C Usage 54
- 4.1.6.2. Simple C++ Usage 54
- 4.2. Distributed Compiling 60
- 4.3. Autotools 60
- 4.3.2. Configuration Script 61
- Debugging 63
- 5.2.1. Simple GDB 64
- 5.2.2. Running GDB 65
- 5.2.4. Forked Execution 68
- 5.2.5. Threads 68
- 5.2.7. GDB Documentation 68
- 5.4. Python Pretty-Printers 69
- Highly Customizable 70
- Easy to Learn 70
- Profiling 71
- 6.2. Valgrind 72
- 6.2.2. Using Valgrind 73
- 6.3. OProfile 74
- 6.3.2. Using OProfile 75
- 6.4. SystemTap 76
- Unprivileged Users) 78
- 6.5. Eclipse-Callgraph 79
- Chapter 6. Profiling 80
- 6.5.2. The Callgraph View 81
- Go to Code 84
- 6.6.1. Perf Tool Commands 85
- 6.6.2. Using Perf 85
- 6.7. ftrace 87
- 6.7.2. ftrace Documentation 88
- Appendix A. Revision History 89
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