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.\" ========================================================================
.\"
.IX Title "Net::Daemon::Log 3pm"
.TH Net::Daemon::Log 3pm "2016-12-21" "perl v5.24.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Net::Daemon::Log \- Utility functions for logging
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  # Choose logging method: syslog or Win32::EventLog
\&  $self\->{\*(Aqfacility\*(Aq} = \*(Aqmail\*(Aq; # Default: Daemon
\&  $self\->{\*(Aqlogfile\*(Aq} = undef;   # Default
\&
\&  # Choose logging method: stderr
\&  $self\->{\*(Aqlogfile\*(Aq} = 1;
\&
\&  # Choose logging method: IO handle
\&  my $file = IO::File\->new("my.log", "a");
\&  $self\->{\*(Aqlogfile\*(Aq} = $file;
\&
\&
\&  # Debugging messages (equivalent):
\&  $self\->Log(\*(Aqdebug\*(Aq, "This is a debugging message");
\&  $self\->Debug("This is a debugging message");
\&
\&  # Error messages (equivalent):
\&  $self\->Log(\*(Aqerr\*(Aq, "This is an error message");
\&  $self\->Error("This is an error message");
\&
\&  # Fatal error messages (implies \*(Aqdie\*(Aq)
\&  $self\->Fatal("This is a fatal error message");
.Ve
.SH "WARNING"
.IX Header "WARNING"
\&\s-1THIS IS ALPHA SOFTWARE.\s0 It is *only* 'Alpha' because the interface (\s-1API\s0)
is not finalised. The Alpha status does not reflect code quality or
stability.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
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.
.SS "Generic Logging"
.IX Subsection "Generic Logging"
.Vb 1
\&    $self\->Log($level, $msg, @args);
.Ve
.PP
This is the generic interface. The logging level is in syslog style,
thus one of the words 'debug', 'info', 'notice', 'err' or 'crit'.
You'll rarely need info and notice and I can hardly imagine a reason
for crit (critical). In 95% of all cases debug and err will be
sufficient.
.PP
The logging string \f(CW$msg\fR is a format string similar to printf.
.SS "Utility methods"
.IX Subsection "Utility methods"
.Vb 3
\&    $self\->Debug($msg, @args);
\&    $self\->Error($msg, @args);
\&    $self\->Fatal($msg, @args);
.Ve
.PP
These are replacements for logging with levels debug and err. The difference
between the latter two is that Fatal includes throwing a Perl exception.
.SS "Chossing a logging target"
.IX Subsection "Chossing a logging target"
By default logging will happen to syslog (Unix) or EventLog (Windows).
However you may choose logging to stderr by setting
.PP
.Vb 1
\&    $self\->{\*(Aqlogfile\*(Aq} = 1;
.Ve
.PP
This is required if neither of syslog and EventLog is available. An
alternative option is setting
.PP
.Vb 1
\&    $self\->{\*(Aqlogfile\*(Aq} = $handle;
.Ve
.PP
where \f(CW$handle\fR is any object supporting a \fIprint\fR method, for example
an IO::Handle object. Usually the logging target is choosen as soon
as you call \f(CW$self\fR\->\fILog()\fR the first time. However, you may force
choosing the target by doing a
.PP
.Vb 1
\&    $self\->OpenLog();
.Ve
.PP
before calling Log the first time.
.SH "MULTITHREADING"
.IX Header "MULTITHREADING"
The Multithreading capabitities of this class are depending heavily
on the underlying classes Sys::Syslog, Win32::EventLog or IO::Handle.
If they are thread safe, you can well assume that this package is
too. (The exception being that you should better call
\&\f(CW$self\fR\->\fIOpenLog()\fR before threading.)
.SH "AUTHOR AND COPYRIGHT"
.IX Header "AUTHOR AND COPYRIGHT"
.Vb 4
\&  Net::Daemon is Copyright (C) 1998, Jochen Wiedmann
\&                                     Am Eisteich 9
\&                                     72555 Metzingen
\&                                     Germany
\&
\&                                     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.
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fINet::Daemon\fR\|(3), \fISys::Syslog\fR\|(3), \fIWin32::EventLog\fR\|(3),
\&\fIIO::Handle\fR\|(3)