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Code Editor : POSIX.pod
=encoding utf8 =head1 NAME Mail::Box::Locker::POSIX - lock a folder using kernel file-locking =head1 INHERITANCE Mail::Box::Locker::POSIX is a Mail::Box::Locker is a Mail::Reporter =head1 SYNOPSIS See Mail::Box::Locker =head1 DESCRIPTION This locker object is created by the folder to get an exclusive lock on the file which contains the data using the kernel's POSIX facilities. This lock is created on a separate file-handle to the folder file, so not the handle which is reading. B<WARNING>: Not all platforms support POSIX locking (via fcntl) and not always in the same way. This implementation does not use XS to access the structure of fcntl(): it is better to use the ::FcntlLock which does. No, this implementation "guesses" the location of the bytes. 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::POSIX-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 POSIX posix_file <undef> timeout Mail::Box::Locker 10 trace Mail::Reporter 'WARNINGS' =over 2 =item expires => SECONDS =item file => FILENAME =item folder => FOLDER =item log => LEVEL =item method => STRING|CLASS|ARRAY =item posix_file => FILENAME Alternative name for C<file>, especially useful to avoid confusion when the multi-locker is used. =item timeout => SECONDS|'NOTIMEOUT' =item trace => LEVEL =back =back =head2 Attributes Extends L<"Attributes" in Mail::Box::Locker|Mail::Box::Locker/"Attributes">. =over 4 =item $obj-E<gt>B<expires>( [SECONDS] ) Inherited, see L<Mail::Box::Locker/"Attributes"> =item $obj-E<gt>B<timeout>( [SECONDS] ) Inherited, see L<Mail::Box::Locker/"Attributes"> =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, $callback] ) =item Mail::Box::Locker::POSIX-E<gt>B<defaultTrace>( [$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, [$strings]] ) =item Mail::Box::Locker::POSIX-E<gt>B<log>( [$level, [$strings]] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<logPriority>($level) =item Mail::Box::Locker::POSIX-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 lockf'd =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 POSIX lock file $filename for $folder: $! For POSIX style locking, a folder it must be opened, which does not succeed for the specified reason. =item Error: Will never get a POSIX lock at $filename for $folder: $! Tried to lock 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 3.009, built on August 18, 2020. Website: F<http://perl.overmeer.net/CPAN/> =head1 LICENSE Copyrights 2001-2020 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://dev.perl.org/licenses/>
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