syslog

   1           Numerical             Facility
   2              Code
   3 
   4               0             kernel messages
   5               1             user-level messages
   6               2             mail system
   7               3             system daemons
   8               4             security/authorization messages
   9               5             messages generated internally by syslogd
  10               6             line printer subsystem
  11               7             network news subsystem
  12               8             UUCP subsystem
  13               9             clock daemon
  14              10             security/authorization messages
  15              11             FTP daemon
  16              12             NTP subsystem
  17              13             log audit
  18              14             log alert
  19              15             clock daemon (note 2)
  20              16             local use 0  (local0)
  21              17             local use 1  (local1)
  22              18             local use 2  (local2)
  23              19             local use 3  (local3)
  24              20             local use 4  (local4)
  25              21             local use 5  (local5)
  26              22             local use 6  (local6)
  27              23             local use 7  (local7)

   1 /*
   2  * priorities/facilities are encoded into a single 32-bit quantity, where the
   3  * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility
   4  * (0-big number).  Both the priorities and the facilities map roughly
   5  * one-to-one to strings in the syslogd(8) source code.  This mapping is
   6  * included in this file.
   7  */

   1 /*
   2  * priorities (these are ordered)
   3  */
   4 #define LOG_EMERG       0       /* system is unusable */
   5 #define LOG_ALERT       1       /* action must be taken immediately */
   6 #define LOG_CRIT        2       /* critical conditions */
   7 #define LOG_ERR         3       /* error conditions */
   8 #define LOG_WARNING     4       /* warning conditions */
   9 #define LOG_NOTICE      5       /* normal but significant condition */
  10 #define LOG_INFO        6       /* informational */
  11 #define LOG_DEBUG       7       /* debug-level messages */
  12 
  13 #define LOG_PRIMASK     0x07    /* mask to extract priority part (internal) */
  14                                 /* extract priority */
  15 #define LOG_PRI(p)      ((p) & LOG_PRIMASK)
  16 #define LOG_MAKEPRI(fac, pri)   ((fac) | (pri))
  17 

   1 /* facility codes */
   2 #define LOG_KERN        (0<<3)  /* kernel messages */
   3 #define LOG_USER        (1<<3)  /* random user-level messages */
   4 #define LOG_MAIL        (2<<3)  /* mail system */
   5 #define LOG_DAEMON      (3<<3)  /* system daemons */
   6 #define LOG_AUTH        (4<<3)  /* security/authorization messages */
   7 #define LOG_SYSLOG      (5<<3)  /* messages generated internally by syslogd */
   8 #define LOG_LPR         (6<<3)  /* line printer subsystem */
   9 #define LOG_NEWS        (7<<3)  /* network news subsystem */
  10 #define LOG_UUCP        (8<<3)  /* UUCP subsystem */
  11 #define LOG_CRON        (9<<3)  /* clock daemon */
  12 #define LOG_AUTHPRIV    (10<<3) /* security/authorization messages (private) */
  13 #define LOG_FTP         (11<<3) /* ftp daemon */
  14 
  15         /* other codes through 15 reserved for system use */
  16 #define LOG_LOCAL0      (16<<3) /* reserved for local use */
  17 #define LOG_LOCAL1      (17<<3) /* reserved for local use */
  18 #define LOG_LOCAL2      (18<<3) /* reserved for local use */
  19 #define LOG_LOCAL3      (19<<3) /* reserved for local use */
  20 #define LOG_LOCAL4      (20<<3) /* reserved for local use */
  21 #define LOG_LOCAL5      (21<<3) /* reserved for local use */
  22 #define LOG_LOCAL6      (22<<3) /* reserved for local use */
  23 #define LOG_LOCAL7      (23<<3) /* reserved for local use */
  24 
  25 #define LOG_NFACILITIES 24      /* current number of facilities */
  26 #define LOG_FACMASK     0x03f8  /* mask to extract facility part */
  27                                 /* facility of pri */
  28 #define LOG_FAC(p)      (((p) & LOG_FACMASK) >> 3)
  29