NAME¶

tcl-syslog - Syslog interface for Tcl

SYNOPSIS¶

package require syslog

syslog ?-ident ident? ?-facility facility? ?-pid? ?-perror? priority message
Returns: nothing

DESCRIPTION¶

This project provides a Tcl interface to the standard *nix syslog service. It implements a Tcl package that exports the full functionality of the underlying syslog facility to the Tcl programming language. This includes local and remote logging.

Syslog is a standard for forwarding log messages in an IP network. It is also used to refer to the implementation of this standard and API, that supports both remote and local logging. It is typically used for computer system management and security auditing; usually to aggregate log messages in a central repository. It is standardized within the Syslog working group of the IETF.

Syslog is available in all POSIX compliant and POSIX-like Operating Systems.

-ident is a optional string argument that is used by syslog to differentiate between processes and log contexts. It is up to the user to specify any string here.

-pid prints also the process pid in the log message

-perror prints the message also to stderr

-facility is an optional string dictated by syslog, and categorizes the entity that logs the message, in the following categories/facilities:

       Facility    Description


       auth        security/authorization messages


       authpriv    security/authorization messages (private)


       cron        clock daemon (cron and at)


       daemon      system daemons without separate facility value


       ftp         ftp daemon


       kern        kernel messages


       local[0-7]  local0 to local7 are reserved for local use


       lpr         line printer subsystem


       mail        mail subsystem


       news        USENET news subsystem


       syslog      messages generated internally by syslogd(8)


       user        generic user-level messages


       uucp        UUCP subsystem

The default facility is "user".

priority is another string dictated by syslog, that describes
the severity of the message. In order of higher to lower severity, the
possible strings are:






       Priority    Description


       emergency   system is unusable


       alert       action must be taken immediately


       critical    critical conditions


       error       error conditions


       warning     warning conditions


       notice      normal, but significant, condition


       info        informational message


       debug       debug-level message

This argument is mandatory.

EXAMPLE¶

package require syslog
syslog critical "Message 1"
syslog -ident tclsh warning "Message 2"
syslog -facility local0 notice "Message 3"
syslog -ident tclsh -facility user error "Message 4"
syslog -pid critical "Message 5.0"
syslog -pid -ident tclsh critical "Message 5.1"
syslog -pid -facility local0 debug "Message 5.1"
syslog -pid -facility local1 -ident tclsh info "Message 5.2"
syslog -pid -ident tclsh -facility local2 warning "Message 5.3"
Outputs in /var/log/syslog (syslog timestamps and line prefix removed) :


 tclsh: Message 1


 tclsh: Message 2


 tclsh: Message 3


 testident: Message 4


 tclsh[7049]: Message 5.0


 my_ident[7049]: Message 5.1


 tclsh[7049]: Message 5.1


 my_ident[7049]: Message 5.2


 my_ident[7049]: Message 5.3

AUTHOR¶

Alexandros Stergiakis sterg@kth.se
Massimo Manghi mxmanghi@apache.org

COPYRIGHT¶

Copyright (C) 2008 Alexandros Stergiakis
Copyright (C) 2024 Massimo Manghi

This program is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.