c-logger's Introduction

C logger

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

build.bat

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

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c-logger's Issues

[Question] Is possible have multiple file loggers?

In a web app, we need have logs by user. Dynamic file logger creation is possible?

Enhancement: logger_deinit to avoid valgrind report memory leak

Hi there,

There will always have memory leak detected by valgrind when using file logger, and it will disable if not using file logger.

Is there possible create a logger_deinit function to let caller to release the stuffs inside c-logger?

Thanks

==151761== 
==151761== HEAP SUMMARY:
==151761==     in use at exit: 472 bytes in 1 blocks
==151761==   total heap usage: 797 allocs, 796 frees, 1,555,765 bytes allocated
==151761== 
==151761== 472 bytes in 1 blocks are still reachable in loss record 1 of 1
==151761==    at 0x4848899: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==151761==    by 0x4BDE6CD: __fopen_internal (iofopen.c:65)
==151761==    by 0x4BDE6CD: fopen@@GLIBC_2.2.5 (iofopen.c:86)
==151761==    by 0x48FE7D5: logger_initFileLogger (logger.c:174)
==151761==    by 0x10CB6E: main (main.cpp:47)
==151761== 
==151761== LEAK SUMMARY:
==151761==    definitely lost: 0 bytes in 0 blocks
==151761==    indirectly lost: 0 bytes in 0 blocks
==151761==      possibly lost: 0 bytes in 0 blocks
==151761==    still reachable: 472 bytes in 1 blocks
==151761==         suppressed: 0 bytes in 0 blocks
==151761== 
==151761== For lists of detected and suppressed errors, rerun with: -s
==151761== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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