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SYSLOG(3)							     SYSLOG(3)

NAME
       syslog, openlog, closelog, setlogmask - control system log

SYNOPSIS
       #include <syslog.h>

       openlog(ident, logopt, facility)
       char *ident;

       syslog(priority, message, parameters ... )
       char *message;

       closelog()

       setlogmask(maskpri)

DESCRIPTION
       Syslog  arranges	 to  write  message  onto the system log maintained by
       syslogd(8).  The message is tagged with priority.   The	message	 looks
       like a printf(3) string except that %m is replaced by the current error
       message (collected from errno).	A trailing newline is added if needed.
       This  message  will  be	read  by  syslogd(8) and written to the system
       console, log  files,  or	 forwarded  to	syslogd	 on  another  host  as
       appropriate.

       Priorities  are	encoded	 as  a	facility  and  a  level.  The facility
       describes the part of the system generating the message.	 The level  is
       selected from an ordered list:

       LOG_EMERG     A	panic  condition.   This  is normally broadcast to all
		     users.

       LOG_ALERT     A condition that should be corrected immediately, such as
		     a corrupted system database.

       LOG_CRIT	     Critical conditions, e.g., hard device errors.

       LOG_ERR	     Errors.

       LOG_WARNING   Warning messages.

       LOG_NOTICE    Conditions	 that  are  not	 error	conditions, but should
		     possibly be handled specially.

       LOG_INFO	     Informational messages.

       LOG_DEBUG     Messages that contain information normally	 of  use  only
		     when debugging a program.

       If  syslog cannot pass the message to syslogd, it will attempt to write
       the message on /dev/console if the LOG_CONS option is set (see below).

       If special processing is needed, openlog can be	called	to  initialize
       the  log	 file.	 The  parameter ident is a string that is prepended to
       every message.  Logopt is  a  bit  field	 indicating  logging  options.
       Current values for logopt are:

       LOG_PID	     log   the	process	 id  with  each	 message:  useful  for
		     identifying instantiations of daemons.

       LOG_CONS	     Force writing messages to the console if unable  to  send
		     it	 to  syslogd.	This  option  is safe to use in daemon
		     processes that have no controlling terminal since	syslog
		     will fork before opening the console.

       LOG_NDELAY    Open the connection to syslogd immediately.  Normally the
		     open is  delayed  until  the  first  message  is  logged.
		     Useful  for  programs  that  need	to manage the order in
		     which file descriptors are allocated.

       LOG_NOWAIT    Don't wait for children forked to	log  messages  on  the
		     console.	This  option  should be used by processes that
		     enable notification of child termination via SIGCHLD,  as
		     syslog may otherwise block waiting for a child whose exit
		     status has already been collected.

       The facility parameter encodes a default facility to be assigned to all
       messages that do not have an explicit facility encoded:

       LOG_KERN	     Messages  generated  by  the  kernel.   These  cannot  be
		     generated by any user processes.

       LOG_USER	     Messages generated by random user processes.  This is the
		     default facility identifier if none is specified.

       LOG_MAIL	     The mail system.

       LOG_DAEMON    System daemons, such as ftpd(8), routed(8), etc.

       LOG_AUTH	     The authorization system: login(1), su(1), getty(8), etc.

       LOG_LPR	     The line printer spooling system: lpr(1), lpc(8), lpd(8),
		     etc.

       LOG_LOCAL0    Reserved for local use.  Similarly for LOG_LOCAL1 through
		     LOG_LOCAL7.

       Closelog can be used to close the log file.

       Setlogmask  sets	 the  log  priority  mask  to  maskpri and returns the
       previous mask.  Calls to syslog with a priority not set in maskpri  are
       rejected.  The mask for an individual priority pri is calculated by the
       macro LOG_MASK(pri); the mask for all priorities up  to	and  including
       toppri  is given by the macro LOG_UPTO(toppri).	The default allows all
       priorities to be logged.

EXAMPLES
       syslog(LOG_ALERT, "who: internal error 23");

       openlog("ftpd", LOG_PID, LOG_DAEMON);
       setlogmask(LOG_UPTO(LOG_ERR));
       syslog(LOG_INFO, "Connection from host %d", CallingHost);

       syslog(LOG_INFO|LOG_LOCAL2, "foobar error: %m");

SEE ALSO
       logger(1), syslogd(8)

4.2 Berkeley Distribution	 May 15, 1986			     SYSLOG(3)
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