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Malcolm H. Nooning
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Net::Daemon::Log - Utility functions for logging


  # Choose logging method: syslog or Win32::EventLog
  $self->{'facility'} = 'mail'; # Default: Daemon
  $self->{'logfile'} = undef;   # Default

  # Choose logging method: stderr
  $self->{'logfile'} = 1;

  # Choose logging method: IO handle
  my $file = IO::File->new("my.log", "a");
  $self->{'logfile'} = $file;

  # Debugging messages (equivalent):
  $self->Log('debug', "This is a debugging message");
  $self->Debug("This is a debugging message");

  # Error messages (equivalent):
  $self->Log('err', "This is an error message");
  $self->Error("This is an error message");

  # Fatal error messages (implies 'die')
  $self->Fatal("This is a fatal error message");


THIS IS ALPHA SOFTWARE. It is *only* 'Alpha' because the interface (API) is not finalised. The Alpha status does not reflect code quality or stability.


Net::Daemon::Log is a utility class for portable logging messages. By default it uses syslog (Unix) or Win32::EventLog (Windows), but logging messages can also be redirected to stderr or a log file.

Generic Logging

    $self->Log($level, $msg, @args);

This is the generic interface. The logging level is in syslog style, thus one of the words 'debug', 'info', 'notice', 'err' or 'crit'. You'll rarely need info and notice and I can hardly imagine a reason for crit (critical). In 95% of all cases debug and err will be sufficient.

The logging string $msg is a format string similar to printf.

Utility methods

    $self->Debug($msg, @args);
    $self->Error($msg, @args);
    $self->Fatal($msg, @args);

These are replacements for logging with levels debug and err. The difference between the latter two is that Fatal includes throwing a Perl exception.

Chossing a logging target

By default logging will happen to syslog (Unix) or EventLog (Windows). However you may choose logging to stderr by setting

    $self->{'logfile'} = 1;

This is required if neither of syslog and EventLog is available. An alternative option is setting

    $self->{'logfile'} = $handle;

where $handle is any object supporting a print method, for example an IO::Handle object. Usually the logging target is choosen as soon as you call $self->Log() the first time. However, you may force choosing the target by doing a


before calling Log the first time.


The Multithreading capabitities of this class are depending heavily on the underlying classes Sys::Syslog, Win32::EventLog or IO::Handle. If they are thread safe, you can well assume that this package is too. (The exception being that you should better call $self->OpenLog() before threading.)


  Net::Daemon is Copyright (C) 1998, Jochen Wiedmann
                                     Am Eisteich 9
                                     72555 Metzingen

                                     Phone: +49 7123 14887
                                     Email: joe@ispsoft.de

  All rights reserved.

  You may distribute this package under the terms of either the GNU
  General Public License or the Artistic License, as specified in the
  Perl README file.


Net::Daemon(3), Sys::Syslog(3), Win32::EventLog(3), IO::Handle(3)