Author Archives: daveti

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About daveti

Interested in kernel hacking, compilers, machine learning and guitars.

Valgrind – dynamic code analysis tool – part III – Helgrind

Posted on August 1, 2012 by daveti

Valgrind – Helgrind – concurrency issue detection. # Helgrind http://valgrind.org/docs/manual/hg-manual.html –tool=helgrind [root@localhost valgrindTest]# cat simpleDataRace.c /* Code from Valgrind Manual */ #include <pthread.h> int var = 0; void* child_fn ( void* arg ) { var++; /* Unprotected relative to parent … Continue reading →

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Valgrind – dynamic code analysis tool – part II – fd leak

Posted on August 1, 2012 by daveti

Valgrind – File descriptor (fd) leak detection trial # File descriptor (fd) leak detection –track-fds=yes [root@localhost valgrindTest]# cat fdLeakTry.c /* daveti’s stupid code for fd leak */ #include <stdio.h> int main( int argc, char *argv[]) { FILE *fdPtr = fopen(“daveti.log”, … Continue reading →

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Valgrind – dynamic code analysis tool – part I – basic trial and hints

Posted on August 1, 2012 by daveti

We are recently trying to find a tool providing the ability for concurrency issue detection. For this topic, generally, I believe in 3 steps: 1. CPR (capacity, performance, redundancy) testing, 2. Static code analysis, 3. Dynamic code analysis. CPR testing … Continue reading →

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bind() error 0x63 – Cannot assign requested address

Posted on July 3, 2012 by daveti

Recently encountered a bind() error 0x63 – cannot assign requested address. After some effort on debugging, I list 2 possibilities here for reference when handling such this error code from bind().  Generally, if it is related with bad socket close/cleanup, … Continue reading →

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gprof and dot – some hints using gprof, gprof2dot and dot

Posted on June 21, 2012 by daveti

Recently done a performance tuning using gprof, gprof2dot and dot. While there are already a lot of webs talking about them respectively or generally. This post is trying to provide some hints from my real experience, as well as some … Continue reading →

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A bad include in C – why static code analysis is needed for modern C/C++ projects

Posted on June 15, 2012 by daveti

We have already had a long discussion and argument for ‘include’ mechanism in C/C++, no matter good or bad, and this is not my intention here. I am writing this post to show a confusing compiler error we have recently … Continue reading →

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csve – csv file evolver

Posted on May 19, 2012 by daveti

Csv file, short for Comma Separated Version file, is usually a easy and common way to record [field:value] in multiple lines with all fields and values separated by comma, which is the basic data file of Microsoft Excel, as well … Continue reading →

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cccmt – Coverity code complexity metrics tool

Posted on April 21, 2012 by daveti

cccmt is used to parse the METRICS.errors.xml generated by cov-analyze of Coverity to produce a Code Complexity Metrics (CCM) report of different functions. SAX is used to parse XML file instead of DOM as the XML file may be very … Continue reading →

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itevad – How to write your own protocol and its stack – part 9

Posted on April 20, 2012 by daveti

Previous_Part_8 Now we are moving to the last post of ‘itevad’ – writing a stack for decoding text format of Itevad Protocol using Flex and Bison as well as C as a main function. Being different with previous Flex and … Continue reading →

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itevad – How to write your own protocol and its stack – part 8

Posted on April 20, 2012 by daveti

Previous_Part_7 After writing a Flex standalone lexer, we are going to make it a little bit useful – adding parser, Bison. When Flex and Bison work together, standalone flex file needs some changes to cooperate with Bison, as you will … Continue reading →

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