liuguohua-cn/c-logger

A simple logging library for C/C++

C logger

Table of Contents

• What is this?
• Installation
• Platform
• Benchmark
• Log format
• Example
• License

What is this?

This is a simple logging library for C/C++.

This library's main features:

• Lightweight - only 500-line source code
• C89 support
• Thread-safe
• 2 logging types:
  • Console logging
  • File logging rotated by file size
• Custom with a configuration file

Installation

./build.sh
cd build
make
sudo make install

or

build.bat

or

Copy files in src directory to your project

Platform

• Windows (Visual Studio 2008+)
• Mac OS X (clang 3.6+)
• Linux (gcc 4.8.4+)

Note: Operations are confirmed on the above platforms

Benchmark

This following table comparing other libraries is benchmark results to log 1,000,000 times.

threads	c-logger	glog
1	0.832s	1.267s
10	1.386s	1.183s

Benchmark environment

• Processor: Intel Core i3-4170 CPU @ 3.70GHz
• Memory: 8.0GB
• OS: Ubuntu 16.04 64bit

Log format

level yy-MM-dd hh:mm:ss:uuuuuu threadid file:line: message

Example

Console logging

logger_initConsoleLogger(stderr);
logger_setLevel(LogLevel_DEBUG);
LOG_INFO("console logging");

File logging

logger_initFileLogger("logs/log.txt", 1024 * 1024, 5);
logger_setLevel(LogLevel_DEBUG);
LOG_INFO("file logging");
LOG_DEBUG("format example: %d%c%s", 1, '2', "3");

The output of the file logger is the following:

I 15-11-10 00:32:43.771455 2854 filelogger.c:6: file logging
D 15-11-10 00:32:43.771564 2854 filelogger.c:7: format example: 123

Multi logging

logger_initConsoleLogger(NULL);
logger_initFileLogger("logs/log.txt", 0, 0);
LOG_INFO("multi logging");

License

The MIT license