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: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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