phpman > perldoc > Net::Server::Daemonize

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 AT howard.fm>

    Program flow, concepts and initial work.

    Paul Seamons <paul AT 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.