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-\section{Built-in Module \module{syslog}}
-\label{module-syslog}
-\bimodindex{syslog}
-
-This module provides an interface to the \UNIX{} \code{syslog} library
-routines. Refer to the \UNIX{} manual pages for a detailed description
-of the \code{syslog} facility.
-
-The module defines the following functions:
-
-
-\begin{funcdesc}{syslog}{\optional{priority,} message}
-Send the string \var{message} to the system logger. A trailing
-newline is added if necessary. Each message is tagged with a priority
-composed of a \var{facility} and a \var{level}. The optional
-\var{priority} argument, which defaults to \constant{LOG_INFO},
-determines the message priority. If the facility is not encoded in
-\var{priority} using logical-or (\code{LOG_INFO | LOG_USER}), the
-value given in the \function{openlog()} call is used.
-\end{funcdesc}
-
-\begin{funcdesc}{openlog}{ident\optional{, logopt\optional{, facility}}}
-Logging options other than the defaults can be set by explicitly
-opening the log file with \function{openlog()} prior to calling
-\function{syslog()}. The defaults are (usually) \var{ident} =
-\code{'syslog'}, \var{logopt} = \code{0}, \var{facility} =
-\constant{LOG_USER}. The \var{ident} argument is a string which is
-prepended to every message. The optional \var{logopt} argument is a
-bit field - see below for possible values to combine. The optional
-\var{facility} argument sets the default facility for messages which
-do not have a facility explicitly encoded.
-\end{funcdesc}
-
-\begin{funcdesc}{closelog}{}
-Close the log file.
-\end{funcdesc}
-
-\begin{funcdesc}{setlogmask}{maskpri}
-This function set the priority mask to \var{maskpri} and returns the
-previous mask value. Calls to \function{syslog()} with a priority
-level not set in \var{maskpri} are ignored. The default is to log all
-priorities. The function \code{LOG_MASK(\var{pri})} calculates the
-mask for the individual priority \var{pri}. The function
-\code{LOG_UPTO(\var{pri})} calculates the mask for all priorities up
-to and including \var{pri}.
-\end{funcdesc}
-
-The module defines the following constants:
-
-\begin{description}
-
-\item[Priority levels (high to low):]
-
-\constant{LOG_EMERG}, \constant{LOG_ALERT}, \constant{LOG_CRIT},
-\constant{LOG_ERR}, \constant{LOG_WARNING}, \constant{LOG_NOTICE},
-\constant{LOG_INFO}, \constant{LOG_DEBUG}.
-
-\item[Facilities:]
-
-\constant{LOG_KERN}, \constant{LOG_USER}, \constant{LOG_MAIL},
-\constant{LOG_DAEMON}, \constant{LOG_AUTH}, \constant{LOG_LPR},
-\constant{LOG_NEWS}, \constant{LOG_UUCP}, \constant{LOG_CRON} and
-\constant{LOG_LOCAL0} to \constant{LOG_LOCAL7}.
-
-\item[Log options:]
-
-\constant{LOG_PID}, \constant{LOG_CONS}, \constant{LOG_NDELAY},
-\constant{LOG_NOWAIT} and \constant{LOG_PERROR} if defined in
-\code{<syslog.h>}.
-
-\end{description}