Any::Daemon - basic needs for a daemon
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);
This module delivers the basic needs for any daemon on UNIX systems. There are other standard daemon implementations available on CPAN, 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!
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
Change to this group (when started as root)
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.
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.
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
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 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.
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.
The CODE terminates all running children, maybe to start new ones, maybe to terminate the whole daemon.
The maximum (is usual) number of childs to run.
The CODE is run when a SIGHUP is received; signal 1 is used by most daemons as trigger for reconfiguration.
Please post questions or ideas to email@example.com
Copyrights 2011-2012 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