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Today, I would like to share 10 amazing open source C language projects, hoping these resources will be helpful to everyone!
01 Webbench
Webbench is a very simple website stress testing tool used on Linux.
It uses fork() to simulate multiple clients accessing the specified URL simultaneously, testing the performance of the website under pressure.
It can simulate up to 30,000 concurrent connections to test the website’s load capacity. Webbench is written in C, and the code is very concise, totaling less than 600 lines.
Project Address (copy to open in browser)
http://home.tiscali.cz/~cz210552/webbench.html
02 Tinyhttpd
tinyhttpd is a lightweight Http Server developed in C, with a total of only 502 lines of code (including comments), along with a simple client.
By reading this code, one can understand the essence of an Http Server.
Project Address (copy to open in browser)
http://sourceforge.net/projects/tinyhttpd/
03 cJSON
cJSON is a JSON encoder/decoder for C, very lightweight, with only over 500 lines of C code, and it performs very well.
Although cJSON is not very powerful, its small size and speed are its most commendable features.
Its code is well-maintained, and the structure is simple and easy to understand, making it a great C language project for learning.
Project Homepage (copy to open in browser):
http://sourceforge.net/projects/cjson/
04 CMockery
CMockery is a lightweight framework for C unit testing released by Google.
It is compact, has no dependencies on other open source packages, and has low invasiveness to the code being tested.
The source code of CMockery is less than 3K lines, and reading the source code of will_return and mock is straightforward.
Main Features
Free and open source, with technical support from Google;
A lightweight framework that makes testing faster and simpler;
Avoids complex compiler features, ensuring good compatibility with older compilers;
Does not require the code under test to depend on the C99 standard, which is useful for many embedded system developments.
Project Address (copy to open in browser)
http://code.google.com/p/cmockery/downloads/list
05 Libev
libev is an open source event-driven library based on OS-provided infrastructures like epoll and kqueue.
It is known for its efficiency, unifying IO events, timers, and signals under a single event handling framework.
Based on the Reactor pattern, it is efficient and has concise code (version 4.15 has over 8000 lines), making it a great resource for learning event-driven programming.
Project Address (copy to open in browser)
http://software.schmorp.de/pkg/libev.html
06 Memcached
Memcached is a high-performance distributed memory object caching system used to alleviate database load for dynamic web applications.
It reduces the number of times the database is read by caching data and objects in memory, thus speeding up dynamic database-driven websites.
Memcached is based on a hashmap that stores key/value pairs. The code size of Memcached-1.4.7 is acceptable, with only about 10K lines.
Project Address (copy to open in browser):
http://memcached.org/
07 Lua
Lua is great and can be easily compiled on any platform that supports ANSI C compilers.
The code size of Lua is small enough, with version 5.1.4 having only 15,000 lines, and after removing blank lines and comments, it can be estimated to be around 10,000 lines.
Project Address (copy to open in browser)
http://www.lua.org/
08 SQLite
SQLite is an open-source embedded relational database that implements a self-contained, zero-configuration, transactional SQL database engine. Its features include high portability, ease of use, compact structure, efficiency, and reliability.
It is small enough, with approximately 30,000 lines of C code, totaling 250K.
Project Address
http://www.sqlite.org/
09 UNIX v6
The source code of the UNIX V6 kernel, including device drivers, is about 10,000 lines, a quantity that beginners can fully understand. There is a saying that the maximum amount of code a person can comprehend is around 10,000 lines, and the UNIX V6 kernel source code fits perfectly within this range.
At this point, are you also thinking, “If it’s only 10,000 lines, maybe I can learn it too?”
On the other hand, recent operating systems, such as the latest Linux kernel, are said to exceed 10 million lines of code.
Even for those who are not beginners, fully understanding all the code is basically impossible.
Project Address (copy to open in browser)
http://minnie.tuhs.org/cgi-bin/utree.pl?file=V6
10 NETBSD
NetBSD is a free, highly portable UNIX-like operating system.
The slogan of the NetBSD project is: “Of course it runs NetBSD”.
It is designed to be simple, with standardized code, and has many advanced features, making it highly praised in both industry and academia.
Due to its simple design and advanced features, it performs excellently in both production and research, and it also has complete source code supported by its users.
Many programs can be easily obtained through the NetBSD Packages Collection.
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