Simple Logger

Logging library for C++ programs.

Author

Jung-Sang Ahn jungsang.ahn@gmail.com

How to use

Copy all files under src directory to your project, and then include logger.h.

Example code

Please refer to basic_example.cc

Features

• Multi-thread safe.
• Lightweight: observed up to 6M logs/second (by multi threads) on i7 8-thread machine.
• Different log levels and formats for file and display.
• Circular log file reclaiming.
• Auto compression (tar.gz) of old log files.
• Stack backtrace on crash or abort.
  • Linux and Mac only.
  • Linux: addr2line is needed.

Screenshot

• On display

• On log file

2018-07-15T19:33:10.550_560-07:00 [448e] [====] Start logger: ./example_log.log (32 MB per file, up to 16 files)    [logger.cc:435, start()]
2018-07-15T19:33:10.550_659-07:00 [448e] [FATL] fatal error [basic_example.cc:29, main()]
2018-07-15T19:33:10.550_699-07:00 [448e] [ERRO] error   [basic_example.cc:30, main()]
2018-07-15T19:33:10.550_734-07:00 [448e] [WARN] warning [basic_example.cc:31, main()]
2018-07-15T19:33:10.550_774-07:00 [448e] [INFO] info    [basic_example.cc:32, main()]
2018-07-15T19:33:10.550_814-07:00 [448e] [DEBG] debug   [basic_example.cc:33, main()]
2018-07-15T19:33:10.550_854-07:00 [448e] [TRAC] trace   [basic_example.cc:34, main()]
2018-07-15T19:33:10.550_900-07:00 [448e] [====] Stop logger: ./example_log.log  [logger.cc:451, stop()]

Misc.

• There are false alarms by thread sanitizer. To suppress it, add -DSUPPRESS_TSAN_FALSE_ALARMS=1 flag to CXXFLAGS.