NAME
Daemon::Daemonize - An easy-to-use daemon(izing) toolkit
VERSION
version 0.0052
SYNOPSIS
use Daemon::Daemonize qw/ :all /
daemonize( %options, run => sub {
# Daemon code in here...
} )
# Do some non-daemon stuff here...You can also use it in the traditional way, daemonizing the current process:
daemonize( %options )
# Daemon code in here...and use it to check up on your daemon:
# In your daemon
use Daemon::Daemonize qw/ :all /
write_pidfile( $pidfile )
$SIG{INT} = sub { delete_pidfile( $pidfile ) }
... Elsewhere ...
use Daemon::Daemonize qw/ :all /
# Return the pid from $pidfile if it contains a pid AND
# the process is running (even if you don't own it), 0 otherwise
my $pid = check_pidfile( $pidfile )
# Return the pid from $pidfile, or undef if the
# file doesn't exist, is unreadable, etc.
# This will return the pid regardless of if the process is running
my $pid = read_pidfile( $pidfile )DESCRIPTION
Daemon::Daemonize is a toolkit for daemonizing processes and checking up on them. It takes inspiration from http://www.clapper.org/software/daemonize/, MooseX::Daemon, Net::Server::Daemon
A note about the close option
If you're having trouble with IPC in a daemon, try closing only STD* instead of everything:
daemonize( ..., close => std, ... )This is a workaround for a problem with using Net::Server and IPC::Open3 in a daemonized process
USAGE
You can use the following functions in two ways, by either importing them:
use Daemon::Daemonize qw/ daemonize /
daemonize( ... )or calling them as a class method:
use Daemon::Daemonize
Daemon::Daemonize->daemonizedaemonize( %options )
Daemonize the current process, according to %options:
chdir <dir> Change to <dir> when daemonizing. Pass undef for *no* chdir.
Default is '/' (to prevent a umount conflict)
close <option> Automatically close opened files when daemonizing:
1 Close STDIN, STDOUT, STDERR (usually redirected
from/to /dev/null). In addition, close any other
opened files (up to POSIX::_SC_OPEN_MAX)
0 Don't close anything
std Only close STD{IN,OUT,ERR} (as in 1)
Default is 1 (close everything)
stdout <file> Open up STDOUT of the process to <file>. This will override any
closing of STDOUT
stderr <file> Open up STDERR of the process to <file>. This will override any
closing of STDERR
run <code> After daemonizing, run the given code and then exitread_pidfile( $pidfile )
Return the pid from $pidfile. Return undef if the file doesn't exist, is unreadable, etc. This will return the pid regardless of if the process is running
For an alternative, see check_pidfile
check_pidfile( $pidfile )
Return the pid from $pidfile if it contains a pid AND the process is running (even if you don't own it), and 0 otherwise
This method will always return a number
write_pidfile( $pidfile, [ $pid ] )
Write the given pid to $pidfile, creating/overwriting any existing file. The second argument is optional, and will default to $$ (the current process number)
delete_pidfile( $pidfile )
Unconditionally delete (unlink) $pidfile
does_process_exist( $pid )
Using kill, attempts to determine if $pid exists (is running).
If you don't own $pid, this method will still return true (by examining errno for EPERM).
For an alternative, see can_signal_process
can_signal_process( $pid )
Using kill, attempts to determine if $pid exists (is running) and is owned (signable) by the user.
check_port( $port )
Returns true if $port on the localhost is accepting connections.
SEE ALSO
AUTHOR
Robert Krimen <robertkrimen@gmail.com>COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by Robert Krimen.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.