Mail::Box::Locker::FcntlLock(3)

NAME
Mail::Box::Locker::FcntlLock - lock a folder using File::FcntlLock

INHERITANCE
 Mail::Box::Locker::FcntlLock
   is a Mail::Box::Locker
   is a Mail::Reporter

SYNOPSIS
  See Mail::Box::Locker

DESCRIPTION
This locker object is uses File::FcntlLock, and was contributed by Jim in Aus. It is close to Mail::Box::Locker::POSIX, but does work on more systems, for instance Darwin.

You will need to install File::FcntlLock separately: there is no dependency to it by the MailBox distribution.

Extends "DESCRIPTION" in Mail::Box::Locker.

METHODS
Extends "METHODS" in Mail::Box::Locker.

  Constructors
Extends "Constructors" in Mail::Box::Locker.

$class->new(%options)
    Inherited, see "METHODS" in Mail::Box::Locker

     -Option --Defined in       --Default
      expires  Mail::Box::Locker  1 hour
      file     Mail::Box::Locker  undef
      folder   Mail::Box::Locker  <C<undef>>
      method   Mail::Box::Locker  FcntlLock
      timeout  Mail::Box::Locker  10

    expires => $seconds
    file => $file
    folder => $folder
    method => $name|CLASS|\@names
    timeout => $seconds|'NOTIMEOUT'

  Attributes
Extends "Attributes" in Mail::Box::Locker.

$obj->expires( [SECONDS] )
    Inherited, see "Attributes" in Mail::Box::Locker

$obj->filename( [$filename] )
    Inherited, see "Attributes" in Mail::Box::Locker

$obj->folder( [$folder] )
    Inherited, see "Attributes" in Mail::Box::Locker

$obj->name()
    Inherited, see "Attributes" in Mail::Box::Locker

$obj->timeout( [SECONDS] )
    Inherited, see "Attributes" in Mail::Box::Locker

  Locking
Extends "Locking" in Mail::Box::Locker.

$obj->hasLock()
    Inherited, see "Locking" in Mail::Box::Locker

$obj->isLocked()
    Inherited, see "Locking" in Mail::Box::Locker

$obj->lock()
    Inherited, see "Locking" in Mail::Box::Locker

$obj->unlock()
    Inherited, see "Locking" in Mail::Box::Locker

  Error handling
Extends "Error handling" in Mail::Box::Locker.

$obj->AUTOLOAD()
    Inherited, see "Error handling" in Mail::Reporter

$obj->notImplemented()
    Inherited, see "Error handling" in Mail::Reporter

  Cleanup
Extends "Cleanup" in Mail::Box::Locker.

$obj->DESTROY()
    Inherited, see "Cleanup" in Mail::Box::Locker

DIAGNOSTICS

Fault: Will never get a FcntlLock lock at $file 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. Cast by lock()

Error: class $package does not implement method $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. Cast by notImplemented()

Warning: folder $name already lockf'd.
    Cast by lock()

Fault: unable to check lock file $file 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.

Fault: unable to open FcntlLock lock file $file for $folder
    For FcntlLock style locking, a $folder it must be opened, which does not succeed for the specified reason. Cast by lock()

SEE ALSO
This module is part of Mail-Box version 4.02, built on April 10, 2026. Website: http://perl.overmeer.net/CPAN/

LICENSE
For contributors see file ChangeLog.

This software is copyright (c) 2001-2026 by Mark Overmeer.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.