Sumo techniques

C++ is the main development language used by many of Google's open-source projects. As every C++ programmer knows, the language has many powerful features, but this power brings with it complexity, which in turn can make code more bug-prone and harder to read and maintain.

The goal of this guide is to manage this complexity by describing in detail the dos and don'ts of writing C++ code. These rules exist to keep the code base manageable while still allowing coders to use C++ language features productively.

And why it has been possible to exploit this: http://article.gmane.org/gmane.os.openbsd.misc/211963
xkcd: http://xkcd.com/1354/
history: http://www.smh.com.au/it-pro/security-it/heartbleed-disclosure-timeline-who-knew-what-and-when-20140414-zqurk.html

The Heartbleed Bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This weakness allows stealing the information protected, under normal conditions, by the SSL/TLS encryption used to secure the Internet. SSL/TLS provides communication security and privacy over the Internet for applications such as web, email, instant messaging (IM) and some virtual private networks (VPNs).

Speed memory access by arranging data to take advantage of CPU caching.

realloc story

placement new syntax

valgrind can run a gdb server so that a gdb can interact with it. valgrind has 2 options to trigger that:

--vgdb=yes,
--vgdb-error=0.

This second option tells valgrind it needs to wait for that many errors before freezing and wait for a gdb to connect. Setting it to 0 will make valgrind to wait for gdb to connect before executing the program.

valgrind --vgdb=yes --vgdb-error=0 ./foo
gdb ./foo
(gdb) target remote | vgdb

Linux command shelf is a quick reference guide for all linux user who wish to learn linux commands. Commands are divided into 15 categories , which would be more easier to understand what commands to be used in specific requirement. The pdf format of linux command shelf is also available

lsof -nPi tcp:80

sed '/test/{/error|critical|warning/d}' somefile

!:1-3

shopt -s autocd

nocache <I/O-heavy-command>