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