Valgrind-HOWTO.pdf

Valgrind HOWTO

Deepak P.

pdeepak16@vsnl.com

Sandeep S.

sandeep_gect@yahoo.com

24 August 2002

Revision History

Revision 1.1

2002−09−15

Revised by: tab

Converted to XML 4.1.2, added gfdl, reviewed, author revisions

Revision 1.0

2002−08−24

Revised by: SS

Initial release

This document is a guide to Valgrind, the malloc debugger. Valgrind 1.0.0 is described.

Valgrind HOWTO

Table of Contents

1. Background .....................................................................................................................................................1

2. Introduction. ....................................................................................................................................................2

2.1. Purpose. .............................................................................................................................................2

2.2. Acknowledgments.. ...........................................................................................................................2

2.3. Copyright and Distribution Policy. ...................................................................................................2

2.4. Feedback and Corrections. ................................................................................................................2

3. Getting it Installed. .........................................................................................................................................3

3.1. Getting Valgrind. ..............................................................................................................................3

3.2. Installing. ..........................................................................................................................................3

4. A Closer View. .................................................................................................................................................4

4.1. Why Valgrind?. .................................................................................................................................4

4.2. Usage.. ...............................................................................................................................................4

4.2.1. Invoking Valgrind. ..................................................................................................................4

4.2.2. How to Identify the Error from the Error Report. ...................................................................4

4.2.3. Types of Errors with Examples. ..............................................................................................5

4.2.4. How to Suppress Errors. ..........................................................................................................8

4.3. Limitations and Dependencies of Valgrind.. ....................................................................................9

5. Let's Go Deeper. ............................................................................................................................................10

5.1. How Valgrind Tracks Validity of Each Byte. .................................................................................10

5.2. Cache Profiling. ..............................................................................................................................11

6. Concluding Remarks. ...................................................................................................................................14

7. References. .....................................................................................................................................................15

A. GNU Free Documentation License. ............................................................................................................16

A.1. PREAMBLE. .............................................................................................................................................17

A.2. APPLICABILITY AND DEFINITIONS. ...............................................................................................18

A.3. VERBATIM COPYING. ..........................................................................................................................19

A.4. COPYING IN QUANTITY. .....................................................................................................................20

A.5. MODIFICATIONS. ..................................................................................................................................21

A.6. COMBINING DOCUMENTS. ................................................................................................................23

A.7. COLLECTIONS OF DOCUMENTS. .....................................................................................................24

A.8. AGGREGATION WITH INDEPENDENT WORKS. ..........................................................................25

Valgrind HOWTO

Table of Contents

A.9. TRANSLATION .......................................................................................................................................26

A.10. TERMINATION. ....................................................................................................................................27

A.11. FUTURE REVISIONS OF THIS LICENSE. .......................................................................................28

A.12. How to use this License for your documents. .......................................................................................29

1. Background

Dynamic storage allocation plays an important role in C programming; it is also the breeding ground of

numerous hard−to−track−down bugs. Freeing an allocated block twice, running off the edge of the malloc'ed

buffer, and failing to keep track of addresses of allocated blocks are common errors which frustrate the

programmer − debugging them is very difficult due to the errors manifesting themselves as "mysterious

behavior" at places far off from the point where the programmer actually committed the blunder.

1. Background

2. Introduction

2.1. Purpose

Valgrind is an open−source tool for finding memory−management problems in Linux−x86 executables. It

detects memory leaks/corruption in the program being run. It is being developed by Julian Seward .

2.2. Acknowledgments

We express our sincere appreciation to Julian Seward for creating Valgrind. Thanks to Mr.Pramode C.E and

also friends at the Govt Engineering College, Trichur for their advice and cooperation.

2.3. Copyright and Distribution Policy

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free

Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no

Invariant Sections, with no Front−Cover Texts, and no Back−Cover Texts. A copy of the license is included

in Appendix A entitled "GNU Free Documentation License".

2.4. Feedback and Corrections

Kindly forward feedback and criticism to Deepak.P or/and Sandeep.S . We shall be indebted to anybody who

points out errors and inaccuracies in this document; we will rectify them as soon as we are informed.

2. Introduction

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