/usr/share/perl5/Mail/Box/Locker/Flock.pod is in libmail-box-perl 2.117-1.
This file is owned by root:root, with mode 0o644.
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=head1 NAME
Mail::Box::Locker::Flock - lock a folder using kernel file-locking
=head1 INHERITANCE
Mail::Box::Locker::Flock
is a Mail::Box::Locker
is a Mail::Reporter
=head1 SYNOPSIS
See Mail::Box::Locker
=head1 DESCRIPTION
The C<::Flock> object locks the folder by creating an exclusive lock on
the file using the kernel's C<flock> facilities. This lock is created
on a separate file-handle to the folder file, so not the handle which
is reading.
File locking does not work in some situations, for instance for
operating systems do not support C<flock>.
Extends L<"DESCRIPTION" in Mail::Box::Locker|Mail::Box::Locker/"DESCRIPTION">.
=head1 METHODS
Extends L<"METHODS" in Mail::Box::Locker|Mail::Box::Locker/"METHODS">.
=head2 Constructors
Extends L<"Constructors" in Mail::Box::Locker|Mail::Box::Locker/"Constructors">.
=over 4
=item Mail::Box::Locker::Flock-E<gt>B<new>(%options)
-Option --Defined in --Default
expires Mail::Box::Locker 1 hour
file Mail::Box::Locker undef
folder Mail::Box::Locker <undef>
log Mail::Reporter 'WARNINGS'
method Mail::Box::Locker 'FLOCK'
timeout Mail::Box::Locker 10 seconds
trace Mail::Reporter 'WARNINGS'
=over 2
=item expires => SECONDS
=item file => FILENAME
=item folder => FOLDER
=item log => LEVEL
=item method => STRING|CLASS|ARRAY
=item timeout => SECONDS|'NOTIMEOUT'
=item trace => LEVEL
=back
=back
=head2 The Locker
Extends L<"The Locker" in Mail::Box::Locker|Mail::Box::Locker/"The Locker">.
=over 4
=item $obj-E<gt>B<filename>( [$filename] )
Inherited, see L<Mail::Box::Locker/"The Locker">
=item $obj-E<gt>B<folder>( [$folder] )
Inherited, see L<Mail::Box::Locker/"The Locker">
=item $obj-E<gt>B<name>()
Inherited, see L<Mail::Box::Locker/"The Locker">
=back
=head2 Locking
Extends L<"Locking" in Mail::Box::Locker|Mail::Box::Locker/"Locking">.
=over 4
=item $obj-E<gt>B<hasLock>()
Inherited, see L<Mail::Box::Locker/"Locking">
=item $obj-E<gt>B<isLocked>()
=item $obj-E<gt>B<lock>()
=item $obj-E<gt>B<unlock>()
Inherited, see L<Mail::Box::Locker/"Locking">
=back
=head2 Error handling
Extends L<"Error handling" in Mail::Box::Locker|Mail::Box::Locker/"Error handling">.
=over 4
=item $obj-E<gt>B<AUTOLOAD>()
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<addReport>($object)
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
=item Mail::Box::Locker::Flock-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<errors>()
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<log>( [$level, [$strings]] )
=item Mail::Box::Locker::Flock-E<gt>B<log>( [$level, [$strings]] )
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<logPriority>($level)
=item Mail::Box::Locker::Flock-E<gt>B<logPriority>($level)
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<logSettings>()
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<notImplemented>()
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<report>( [$level] )
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<reportAll>( [$level] )
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<trace>( [$level] )
Inherited, see L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<warnings>()
Inherited, see L<Mail::Reporter/"Error handling">
=back
=head2 Cleanup
Extends L<"Cleanup" in Mail::Box::Locker|Mail::Box::Locker/"Cleanup">.
=over 4
=item $obj-E<gt>B<DESTROY>()
Inherited, see L<Mail::Box::Locker/"Cleanup">
=back
=head1 DIAGNOSTICS
=over 4
=item Warning: Folder $folder already flocked
The folder is already locked, but you attempt to lock it again. The
behavior of double flock's is platform dependend, and therefore should
not be attempted. The second lock is ignored (but the unlock isn't)
=item Error: Package $package does not implement $method.
Fatal error: the specific package (or one of its superclasses) does not
implement this method where it should. This message means that some other
related classes do implement this method however the class at hand does
not. Probably you should investigate this and probably inform the author
of the package.
=item Error: Unable to check lock file $filename for $folder: $!
To check whether the filename is used to flock a folder, the file must be
opened. Apparently this fails, which does not mean that the folder is
locked neither that it is unlocked.
=item Error: Unable to open flock file $filename for $folder: $!
For flock-ing a folder it must be opened, which does not succeed for the
specified reason.
=item Error: Will never get a flock at $filename for $folder: $!
Tried to flock the folder, but it did not succeed. The error code received
from the OS indicates that it will not succeed ever, so we do not need to
try again.
=back
=head1 SEE ALSO
This module is part of Mail-Box distribution version 2.117,
built on August 24, 2014. Website: F<http://perl.overmeer.net/mailbox/>
=head1 LICENSE
Copyrights 2001-2014 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>
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