C 語言 - Linux System Log

Linux - System Log

    Linux 當事件發生會產生 log，通常會存在 /var/log 底下。優先度如下。

•     debug
•     info
•     notice
•     warning
•     err
•     crit
•     alert
•     emerg/panic

C 實作 - void syslog(int priority, const char *format, ...)

    #include<stdio.h>
    #include<stdlib.h>
    #include<syslog.h> 
    syslog(LOG_INFO, "hello %s", "woring");
    syslog(LOG_ERR,  "hello %s", "test");

底下為參數 int priority

LOG_USER	: A miscellaneous user process
LOG_MAIL	: Mail
LOG_DAEMON	: A miscellaneous system daemon
LOG_AUTH	: Security (authorization)
LOG_SYSLOG	: Syslog
LOG_LPR	: Central printer
LOG_NEWS	: Network news (e.g. Usenet)
LOG_UUCP	: UUCP
LOG_CRON	: Cron and At
LOG_AUTHPRIV	: Private security (authorization)
LOG_FTP	: Ftp server
LOG_LOCAL(0~7)	: Locally defined

參考資料 :
https://ithelp.ithome.com.tw/articles/10159084
http://yu-minspace.blogspot.com/2007/09/linux-syslogd-openlogsyslogdsyslog.html