Syslog

基本用法:

• 不用openlog 也行，syslog 會自動呼叫，但用了後再message 會比較清楚。
  
• openlog( "test", LOG_PID | LOG_CONS, LOG_USER );
• syslog( LOG_USER | LOG_INFO , "[%d] "format, level, ## args);
  

LOG_EMERG system is unusable
LOG_ALERT action must be taken immediately
LOG_CRIT critical conditions
*LOG_ERR error conditions
*LOG_WARNING warning conditions
LOG_NOTICE normal, but significant, condition
*LOG_INFO informational message
*LOG_DEBUG debug-level message

Reference:

• 何謂syslogd.