NAME

Any::Daemon - basic needs for a daemon

SYNOPSIS

use Any::Daemon;
use Log::Report;

# Prepare a daemon for the Operating System
my $daemon = Any::Daemon->new(@os_opts);

# Start logging to syslog (see Log::Report::Dispatcher)
dispatcher SYSLOG => 'syslog';

# Run managing daemon
$daemon->run(@run_opts);

DESCRIPTION

This module delivers the basic needs for any daemon. There are many standard daemon implementations, with as main common difference that this module is not dedicated to a specific task. By using Log::Report, you can easily redirect error reports to any logging mechanism you like.

The code for this module is in use for many different daemons, some with heavy load (a few dozen requests per second) Have a look in the examples directory of the IO::Mux distribution for an extended example.

METHODS

Constructors

$obj->new(OPTIONS)

Any::Daemon->new(OPTIONS)

With new() you provide the operating system integration OPTIONS, where run() gets the activity related parameters: the real action.

-Option  --Default
 group     undef
 pid_file  undef
 user      undef
 workdir   current working directory

group => GID|GROUPNAME

Change to this group (when started as root)

pid_file => FILENAME

user => UID|USERNAME

Change to this user (when started as root) If you want to run your daemon as root, then explicitly specify that with this option, to avoid a warning.

workdir => DIRECTORY

Change DIRECTORY so temporary files and such are not written in the random directory where the daemon got started.

If the directory does not exist yet, it will be created with mode 0700 when the daemon object is initialized. We only move to that directory when the daemon is run. The working directory does not get cleaned when the daemon stops.

$obj->run(OPTIONS)

The run method gets the activity related parameters.

-Option     --Default
 background   <true>
 child_died   spawn new childs
 child_task   warn only
 kill_childs  send sigterm
 max_childs   10
 reconfigure  ignore

background => BOOLEAN

Run the managing daemon in the background. During testing, it is prefered to run the daemon in the foreground, to be able to stop the daemon with Crtl-C and to see errors directly on the screen in stead of only in some syslog file.

child_died => CODE

The child_died routine handles dieing kids and the restart of new ones. It gets two parameters: the maximum number of childs plus the task to perform per kid.

child_task => CODE

The CODE will be run for each child which is started, also when they are started later on. If the task is not specified, only a warning is produced. This may be useful when you start implementing the daemon: you do not need to care about the task to perform yet.

kill_childs => CODE

The CODE terminates all running children, maybe to start new ones, maybe to terminate the whole daemon.

max_childs => INTEGER

The maximum (is usual) number of childs to run.

reconfigure => CODE

The CODE is run when a SIGHUP is received; signal 1 is used by most daemons as trigger for reconfiguration.

SEE ALSO

This module is part of Any-Daemon distribution version 0.10, built on January 26, 2011. Website: http://perl.overmeer.net/ All modules in this suite: "Any::Daemon", "IO::Mux", and "IO::Mux::HTTP".

Please post questions or ideas to perl@overmeer.net

LICENSE

Copyrights 2011 by Mark Overmeer. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html