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paranoid::lockfile(3pm) [debian man page]

Paranoid::Lockfile(3pm) 				User Contributed Perl Documentation				   Paranoid::Lockfile(3pm)

NAME

       Paranoid::Lockfile - Paranoid Lockfile support

VERSION

       $Id: Lockfile.pm,v 0.65 2011/12/08 07:53:07 acorliss Exp $

SYNOPSIS

	 use Paranoid::Lockfile;

	 $rv = plock($lockfile);
	 $rv = punlock($lockfile);
	 $rv = pcloseLockfile($lockfile);

DESCRIPTION

       This modules provides a relatively safe locking mechanism across multiple processes.  This does not work over NFS or across remote systems,
       this is only intended for use on a single system at a time, and only on those that support flock.

       sysopen is used to avoid race conditions with multiple process attempting to create the same file simultaneously.

SUBROUTINES
/METHODS
   plock
	 $rv = plock($filename);

       This function attempts to safely create or open the lockfile.  It uses sysopen with O_CREAT | O_EXCL to avoid race conditions with other
       processes.  Returns a true if successful.

       Your can pass an optional second argument which would be a string of either 'write' or 'shared'.  The default is 'write', which locks the
       file in exclusive write mode.

       You can pass an optional third argument which would be the lockfile filesystem permissions if the file is created.  The default is 0600.

       NOTE: This function will block until the advisory lock is granted.

   punlock
	 $rv = punlock($filename);

       This function removes any existing locks on the specified filename using flock.	If no previous lock existed or it was successful it
       returns true.  This does not, however, close the open filehandle to the lockfile.

   pcloseLockfile
	 $rv = pcloseLockfile($filename);

       This function releases any existing locks and closes the open filehandle to the lockfile.  Returns true if the file isn't currently open or
       the operation succeeds.

DEPENDENCIES

       o   Fcntl

       o   Paranoid

       o   Paranoid::Debug

BUGS AND LIMITATIONS

AUTHOR

       Arthur Corliss (corliss@digitalmages.com)

LICENSE AND COPYRIGHT

       This software is licensed under the same terms as Perl, itself.	Please see http://dev.perl.org/licenses/ for more information.

       (c) 2005, Arthur Corliss (corliss@digitalmages.com)

perl v5.14.2							    2011-12-08						   Paranoid::Lockfile(3pm)

Check Out this Related Man Page

Paranoid::Network::Socket(3pm)				User Contributed Perl Documentation			    Paranoid::Network::Socket(3pm)

NAME

       Paranoid::Network::Socket - Socket wrapper for seemless IPv6 support

VERSION

       $Id: Socket.pm,v 0.3 2012/05/29 21:38:37 acorliss Exp $

SYNOPSIS

	 # use Socket; # no longer needed
	 use Paranoid::Network::Socket;
	 use Paranoid::Network::Socket qw(:crlf);

	 $ipv6_enabled = has_ipv6();

DESCRIPTION

       This module is a wrapper for Socket(3) and Socket6(3), and is meant to be used in lieu of using those packages directly.  Doing so removes
       any of the version dependent support issues on Perl and its bundled Socket(3) where IPv6 is concerned.

       Starting in Perl 5.12 the beginnings of IPv6 support emerged in the bundled Socket(3) module, but full IPv6 support didn't arrive until
       5.14.  Prior versions of Perl required the use of the external Socket6(3) module (available on CPAN).

       With this module IPv6 support, if available, is brought in automatically at runtime, regardless of where that support is provided.  It also
       makes a default export of inet_pton and inet_ntop, something that Socket(3) only does on request.

       Finally, this module provides a has_ipv6 function which will return whether your Perl has full IPv6 support.  Full support is determined by
       the presence of sockaddr_in6.

       All of the regular tag sets provided by either Socket modules are supported by this module.

SUBROUTINES
/METHODS
   has_ipv6
	   $ipv6_enabled = has_ipv6();

       Returns a boolean value denoting whether or not this module has full IPv6 support.

DEPENDENCIES

       o   Socket

       o   Socket6 (optional)

BUGS AND LIMITATIONS

AUTHOR

       Arthur Corliss (corliss@digitalmages.com)

LICENSE AND COPYRIGHT

       This software is licensed under the same terms as Perl, itself.	Please see http://dev.perl.org/licenses/ for more information.

       (c) 2005, Arthur Corliss (corliss@digitalmages.com)

perl v5.14.2							    2012-05-29					    Paranoid::Network::Socket(3pm)
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