Net::Server::DaemonizeUser)Contributed Perl DocumenNet::Server::Daemonize(3pm)
NAME
Net::Server::Daemonize - Safe fork and daemonization utilities
SYNOPSIS
use Net::Server::Daemonize qw(daemonize);
daemonize(
'nobody', # User
'nobody', # Group
'/var/state/mydaemon.pid' # Path to PID file - optional
);
DESCRIPTION
This module is intended to let you simply and safely daemonize your
server on systems supporting the POSIX module. This means that your
Perl script runs in the background, and it's process ID is stored in a
file so you can easily stop it later.
EXPORTED FUNCTIONS
daemonize
Main routine. Arguments are user (or userid), group (or group id
or space delimited list of groups), and pid_file (path to file).
This routine will check on the pid file, safely fork, create the
pid file (storing the pid in the file), become another user and
group, close STDIN, STDOUT and STDERR, separate from the process
group (become session leader), and install $SIG{INT} to remove the
pid file. In otherwords - daemonize. All errors result in a die.
As of version 0.89 the pid_file is optional.
safe_fork
Block SIGINT during fork. No arguments. Returns pid of forked
child. All errors result in a die.
set_user
Become another user and group. Arguments are user (or userid) and
group (or group id or space delimited list of groups).
set_uid
Become another user. Argument is user (or userid). All errors
die.
set_gid
Become another group. Arguments are groups (or group ids or space
delimited list of groups or group ids). All errors die.
get_uid
Find the uid. Argument is user (userid returns userid). Returns
userid. All errors die.
get_gid
Find the gids. Arguments are groups or space delimited list of
groups. All errors die.
is_root_user
Determine if the process is running as root. Returns 1 or undef.
check_pid_file
Arguments are pid_file (full path to pid_file). Checks for
existence of pid_file. If file exists, open it and determine if
the process that created it is still running. This is done first
by checking for a /proc file system and second using a "ps" command
(BSD syntax). (If neither of these options exist it assumed that
the process has ended) If the process is still running, it aborts.
Otherwise, returns true. All errors die.
create_pid_file.
Arguments are pid_file (full path to pid_file). Calls
check_pid_file. If it is successful (no pid_file exists), creates
a pid file and stores $$ in the file.
unlink_pid_file
Does just that.
SEE ALSO
Net::Server. Net::Daemon, The Perl Cookbook Recipe 17.15.
AUTHORS
Jeremy Howard <j+daemonize@howard.fm>
Program flow, concepts and initial work.
Paul Seamons <paul@seamons.com>
Code rework and componentization. Ongoing maintainer.
LICENSE
This package may be distributed under the terms of either the
GNU General Public License
or the
Perl Artistic License
All rights reserved.
perl v5.30.0 2020-04-03 Net::Server::Daemonize(3pm)
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