:mod:`syslog` --- Unix syslog library routines

.. module:: syslog
 :platform: Unix
 :synopsis: An interface to the Unix syslog library routines.

This module provides an interface to the Unix syslog library routines. Refer to the Unix manual pages for a detailed description of the syslog facility.

The module defines the following functions:

.. function:: syslog([priority,] message)

 Send the string *message* to the system logger. A trailing newline is added if
 necessary. Each message is tagged with a priority composed of a *facility* and
 a *level*. The optional *priority* argument, which defaults to
 :const:`LOG_INFO`, determines the message priority. If the facility is not
 encoded in *priority* using logical-or (``LOG_INFO | LOG_USER``), the value
 given in the :func:`openlog` call is used.

.. function:: openlog(ident[, logopt[, facility]])

 Logging options other than the defaults can be set by explicitly opening the log
 file with :func:`openlog` prior to calling :func:`syslog`. The defaults are
 (usually) *ident* = ``'syslog'``, *logopt* = ``0``, *facility* =
 :const:`LOG_USER`. The *ident* argument is a string which is prepended to every
 message. The optional *logopt* argument is a bit field - see below for possible
 values to combine. The optional *facility* argument sets the default facility
 for messages which do not have a facility explicitly encoded.

.. function:: closelog()

 Close the log file.

.. function:: setlogmask(maskpri)

 Set the priority mask to *maskpri* and return the previous mask value. Calls to
 :func:`syslog` with a priority level not set in *maskpri* are ignored. The
 default is to log all priorities. The function ``LOG_MASK(pri)`` calculates the
 mask for the individual priority *pri*. The function ``LOG_UPTO(pri)``
 calculates the mask for all priorities up to and including *pri*.

The module defines the following constants:

Priority levels (high to low):

:const:`LOG_EMERG`, :const:`LOG_ALERT`, :const:`LOG_CRIT`, :const:`LOG_ERR`, :const:`LOG_WARNING`, :const:`LOG_NOTICE`, :const:`LOG_INFO`, :const:`LOG_DEBUG`.

Facilities:

:const:`LOG_KERN`, :const:`LOG_USER`, :const:`LOG_MAIL`, :const:`LOG_DAEMON`, :const:`LOG_AUTH`, :const:`LOG_LPR`, :const:`LOG_NEWS`, :const:`LOG_UUCP`, :const:`LOG_CRON` and :const:`LOG_LOCAL0` to :const:`LOG_LOCAL7`.

Log options:

:const:`LOG_PID`, :const:`LOG_CONS`, :const:`LOG_NDELAY`, :const:`LOG_NOWAIT` and :const:`LOG_PERROR` if defined in <syslog.h>.

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