1Net::Server::Daemonize(U3s)er Contributed Perl DocumentatNieotn::Server::Daemonize(3)
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NAME

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

9         use Net::Server::Daemonize qw(daemonize);
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11         daemonize(
12           'nobody',                 # User
13           'nobody',                 # Group
14           '/var/state/mydaemon.pid' # Path to PID file - optional
15         );
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DESCRIPTION

18       This module is intended to let you simply and safely daemonize your
19       server on systems supporting the POSIX module. This means that your
20       Perl script runs in the background, and it's process ID is stored in a
21       file so you can easily stop it later.
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EXPORTED FUNCTIONS

24       daemonize
25           Main routine.  Arguments are user (or userid), group (or group id
26           or space delimited list of groups), and pid_file (path to file).
27           This routine will check on the pid file, safely fork, create the
28           pid file (storing the pid in the file), become another user and
29           group, close STDIN, STDOUT and STDERR, separate from the process
30           group (become session leader), and install $SIG{INT} to remove the
31           pid file.  In otherwords - daemonize.  All errors result in a die.
32           As of version 0.89 the pid_file is optional.
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34       safe_fork
35           Block SIGINT during fork.  No arguments.  Returns pid of forked
36           child.  All errors result in a die.
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38       set_user
39           Become another user and group.  Arguments are user (or userid) and
40           group (or group id or space delimited list of groups).
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42       set_uid
43           Become another user.  Argument is user (or userid).  All errors
44           die.
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46       set_gid
47           Become another group.  Arguments are groups (or group ids or space
48           delimited list of groups or group ids).  All errors die.
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50       get_uid
51           Find the uid.  Argument is user (userid returns userid).  Returns
52           userid.  All errors die.
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54       get_gid
55           Find the gids.  Arguments are groups or space delimited list of
56           groups.  All errors die.
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58       is_root_user
59           Determine if the process is running as root.  Returns 1 or undef.
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61       check_pid_file
62           Arguments are pid_file (full path to pid_file).  Checks for exis‐
63           tance of pid_file.  If file exists, open it and determine if the
64           process that created it is still running.  This is done first by
65           checking for a /proc file system and second using a "ps" command
66           (BSD syntax).  (If neither of these options exist it assumed that
67           the process has ended) If the process is still running, it aborts.
68           Otherwise, returns true.  All errors die.
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70       create_pid_file.
71           Arguments are pid_file (full path to pid_file).  Calls
72           check_pid_file.  If it is successful (no pid_file exists), creates
73           a pid file and stores $$ in the file.
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75       unlink_pid_file
76           Does just that.
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SEE ALSO

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

82       Jeremy Howard <j+daemonize@howard.fm>
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84       Program flow, concepts and initial work.
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86       Paul Seamons <paul@seamons.com>
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88       Code rework and componentization.  Ongoing maintainer.
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LICENSE

91         This package may be distributed under the terms of either the
92         GNU General Public License
93           or the
94         Perl Artistic License
95
96         All rights reserved.
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100perl v5.8.8                       2007-02-03         Net::Server::Daemonize(3)