zlog是一个高可靠性、性能、线程安全、灵活、概念清晰的纯C日志函数库。

事实上，在C的世界里面没有特别好的日志函数库（就像JAVA里面的的log4j，或者C++的

log4cxx）。C程序员都喜欢用自己的轮子。printf就是个挺好的轮子，但没办法通过配置改变

日志的格式或者输出文件。syslog是个系统级别的轮子，不过速度慢，而且功能比较单调。

所以我写了zlog。

zlog在效率、功能、安全性上大大超过了log4c，并且是用c写成的，具有比较好的通用性。

zlog有这些特性：

. syslog分类模型，比log4j模型更加直接了当

. 日志格式定制，类似于log4j的pattern layout

. 多种输出，包括动态文件、静态文件、stdout、stderr、syslog、用户自定义输出函数

. 运行时手动、自动刷新配置文件（同时保证安全）

. 高性能，在我的笔记本上达到72 000条日志每秒, 大概是syslog(3)配合rsyslogd的200倍

速度

. 用户自定义等级

. 多线程和多进程环境下保证安全转档

. 精确到微秒

. 简单调用包装dzlog（一个程序默认只用一个分类）

. MDC，线程键-值对的表，可以扩展用户自定义的字段

. 自诊断，可以在运行时输出zlog自己的日志和配置状态

. 不依赖其他库，只要是个POSIX系统就成(当然还要一个C99兼容的vsnprintf)zlog is a reliable, high ecent, thread safe,

exsible, clear model, pure c logging

library

Actually, in the c world there is NO good logging library for application like

logback in java or log4cxx in c++. printf can work, but can not be easily redirected

or reformat, syslog is slow and is designed for system use.

So I write zlog.

It is faster, safer and more powerful than log4c. So it can be widely used.

zlog has feartures below:

 syslog model, better than log4j model

 log format customization

 multiple output, include static le path, dynamic le path, stdout, stderr,

syslog, user-dened ouput

 runtime mannully or automaticlly refreash congure(safely)

 high ecieny, about 200 times faster than syslog(3) with rsyslogd

 user-dened log level

 safely rotate log le on multiple-process or multiple-threads condition

 accurate to microseconds

 dzlog, a default category log API for easy use

 MDC, a log4j style key-value map-zlog is a reliable, high ecent, thread safe,

exsible, clear model, pure c logging

library

Actually, in the c world there is NO good logging library for application like

logback in java or log4cxx in c++. printf can work, but can not be easily redirected

or reformat, syslog is slow and is designed for system use.

So I write zlog.

It is faster, safer and more powerful than log4c. So it can be widely used.

zlog has feartures below:

 syslog model, better than log4j model

 log format customization

 multiple output, include static le path, dynamic le path, stdout, stderr,

syslog, user-dened ouput

 runtime mannully or automaticlly refreash congure(safely)

 high ecieny, about 200 times faster than syslog(3) with rsyslogd

 user-dened log level

 safely rotate log le on multiple-process or multiple-threads condition

 accurate to microseconds

 dzlog, a default category log API for easy use

 MDC, a log4j style key-value map