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syslog.h(0P)		   POSIX Programmer's Manual		  syslog.h(0P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       syslog.h — definitions for system error logging

SYNOPSIS
       #include <syslog.h>

DESCRIPTION
       The <syslog.h> header shall define the  following  symbolic  constants,
       zero  or	 more of which may be OR'ed together to form the logopt option
       of openlog():

       LOG_PID	     Log the process ID with each message.

       LOG_CONS	     Log to the system console on error.

       LOG_NDELAY    Connect to syslog daemon immediately.

       LOG_ODELAY    Delay open until syslog() is called.

       LOG_NOWAIT    Do not wait for child processes.

       The <syslog.h> header shall define the following symbolic constants for
       use as the facility argument to openlog():

       LOG_KERN	     Reserved for message generated by the system.

       LOG_USER	     Message generated by a process.

       LOG_MAIL	     Reserved for message generated by mail system.

       LOG_NEWS	     Reserved for message generated by news system.

       LOG_UUCP	     Reserved for message generated by UUCP system.

       LOG_DAEMON    Reserved for message generated by system daemon.

       LOG_AUTH	     Reserved for message generated by authorization daemon.

       LOG_CRON	     Reserved for message generated by clock daemon.

       LOG_LPR	     Reserved for message generated by printer system.

       LOG_LOCAL0    Reserved for local use.

       LOG_LOCAL1    Reserved for local use.

       LOG_LOCAL2    Reserved for local use.

       LOG_LOCAL3    Reserved for local use.

       LOG_LOCAL4    Reserved for local use.

       LOG_LOCAL5    Reserved for local use.

       LOG_LOCAL6    Reserved for local use.

       LOG_LOCAL7    Reserved for local use.

       The  <syslog.h> header shall define the following macros for construct‐
       ing the maskpri argument to setlogmask().  The following macros	expand
       to  an expression of type int when the argument pri is an expression of
       type int:

       LOG_MASK(pri) A mask for priority pri.

       The <syslog.h> header shall define the following symbolic constants for
       use as the priority argument of syslog():

       LOG_EMERG     A panic condition was reported to all processes.

       LOG_ALERT     A condition that should be corrected immediately.

       LOG_CRIT	     A critical condition.

       LOG_ERR	     An error message.

       LOG_WARNING   A warning message.

       LOG_NOTICE    A condition requiring special handling.

       LOG_INFO	     A general information message.

       LOG_DEBUG     A message useful for debugging programs.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

	   void	 closelog(void);
	   void	 openlog(const char *, int, int);
	   int	 setlogmask(int);
	   void	 syslog(int, const char *, ...);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of POSIX.1‐2008, closelog()

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			  syslog.h(0P)
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