Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages

Manual Reference Pages  -  NET::SERVER::DAEMONIZE (3)

.ds Aq ’


Net::Server::Daemonize - Safe fork and daemonization utilities



    use Net::Server::Daemonize qw(daemonize);

      nobody,                 # User
      nobody,                 # Group
      /var/state/ # Path to PID file - optional


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.


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 existance 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.


Net::Server. Net::Daemon, The Perl Cookbook Recipe 17.15.


Jeremy Howard <>

Program flow, concepts and initial work.

Paul Seamons <>

Code rework and componentization. Ongoing maintainer.


  This package may be distributed under the terms of either the
  GNU General Public License
    or the
  Perl Artistic License

  All rights reserved.

Search for    or go to Top of page |  Section 3 |  Main Index

perl v5.20.3 NET::SERVER::DAEMONIZE (3) 2014-05-05

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.