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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.IX Title "Mail::Box::Locker::FcntlLock 3"
.TH Mail::Box::Locker::FcntlLock 3 2026-04-11 "perl v5.42.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Mail::Box::Locker::FcntlLock \- lock a folder using File::FcntlLock
.SH INHERITANCE
.IX Header "INHERITANCE"
.Vb 3
\& Mail::Box::Locker::FcntlLock
\&   is a Mail::Box::Locker
\&   is a Mail::Reporter
.Ve
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  See Mail::Box::Locker
.Ve
.SH DESCRIPTION
.IX Header "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.
.PP
You will need to install File::FcntlLock separately: there is no
dependency to it by the MailBox distribution.
.PP
Extends "DESCRIPTION" in Mail::Box::Locker.
.SH METHODS
.IX Header "METHODS"
Extends "METHODS" in Mail::Box::Locker.
.SS Constructors
.IX Subsection "Constructors"
Extends "Constructors" in Mail::Box::Locker.
.ie n .IP $class\->\fBnew\fR(%options) 4
.el .IP \f(CW$class\fR\->\fBnew\fR(%options) 4
.IX Item "$class->new(%options)"
Inherited, see "METHODS" in Mail::Box::Locker
.Sp
.Vb 6
\& \-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
.Ve
.RS 4
.ie n .IP "expires => $seconds" 2
.el .IP "expires => \f(CW$seconds\fR" 2
.IX Item "expires => $seconds"
.PD 0
.ie n .IP "file => $file" 2
.el .IP "file => \f(CW$file\fR" 2
.IX Item "file => $file"
.ie n .IP "folder => $folder" 2
.el .IP "folder => \f(CW$folder\fR" 2
.IX Item "folder => $folder"
.ie n .IP "method => $name|CLASS|\e@names" 2
.el .IP "method => \f(CW$name\fR|CLASS|\e@names" 2
.IX Item "method => $name|CLASS|@names"
.ie n .IP "timeout => $seconds|\*(AqNOTIMEOUT\*(Aq" 2
.el .IP "timeout => \f(CW$seconds\fR|\*(AqNOTIMEOUT\*(Aq" 2
.IX Item "timeout => $seconds|'NOTIMEOUT'"
.PD
.RE
.RS 4
.RE
.SS Attributes
.IX Subsection "Attributes"
Extends "Attributes" in Mail::Box::Locker.
.ie n .IP "$obj\->\fBexpires\fR( [SECONDS] )" 4
.el .IP "\f(CW$obj\fR\->\fBexpires\fR( [SECONDS] )" 4
.IX Item "$obj->expires( [SECONDS] )"
Inherited, see "Attributes" in Mail::Box::Locker
.ie n .IP "$obj\->\fBfilename\fR( [$filename] )" 4
.el .IP "\f(CW$obj\fR\->\fBfilename\fR( [$filename] )" 4
.IX Item "$obj->filename( [$filename] )"
Inherited, see "Attributes" in Mail::Box::Locker
.ie n .IP "$obj\->\fBfolder\fR( [$folder] )" 4
.el .IP "\f(CW$obj\fR\->\fBfolder\fR( [$folder] )" 4
.IX Item "$obj->folder( [$folder] )"
Inherited, see "Attributes" in Mail::Box::Locker
.ie n .IP $obj\->\fBname\fR() 4
.el .IP \f(CW$obj\fR\->\fBname\fR() 4
.IX Item "$obj->name()"
Inherited, see "Attributes" in Mail::Box::Locker
.ie n .IP "$obj\->\fBtimeout\fR( [SECONDS] )" 4
.el .IP "\f(CW$obj\fR\->\fBtimeout\fR( [SECONDS] )" 4
.IX Item "$obj->timeout( [SECONDS] )"
Inherited, see "Attributes" in Mail::Box::Locker
.SS Locking
.IX Subsection "Locking"
Extends "Locking" in Mail::Box::Locker.
.ie n .IP $obj\->\fBhasLock\fR() 4
.el .IP \f(CW$obj\fR\->\fBhasLock\fR() 4
.IX Item "$obj->hasLock()"
Inherited, see "Locking" in Mail::Box::Locker
.ie n .IP $obj\->\fBisLocked\fR() 4
.el .IP \f(CW$obj\fR\->\fBisLocked\fR() 4
.IX Item "$obj->isLocked()"
Inherited, see "Locking" in Mail::Box::Locker
.ie n .IP $obj\->\fBlock\fR() 4
.el .IP \f(CW$obj\fR\->\fBlock\fR() 4
.IX Item "$obj->lock()"
Inherited, see "Locking" in Mail::Box::Locker
.ie n .IP $obj\->\fBunlock\fR() 4
.el .IP \f(CW$obj\fR\->\fBunlock\fR() 4
.IX Item "$obj->unlock()"
Inherited, see "Locking" in Mail::Box::Locker
.SS "Error handling"
.IX Subsection "Error handling"
Extends "Error handling" in Mail::Box::Locker.
.ie n .IP $obj\->\fBAUTOLOAD\fR() 4
.el .IP \f(CW$obj\fR\->\fBAUTOLOAD\fR() 4
.IX Item "$obj->AUTOLOAD()"
Inherited, see "Error handling" in Mail::Reporter
.ie n .IP $obj\->\fBnotImplemented\fR() 4
.el .IP \f(CW$obj\fR\->\fBnotImplemented\fR() 4
.IX Item "$obj->notImplemented()"
Inherited, see "Error handling" in Mail::Reporter
.SS Cleanup
.IX Subsection "Cleanup"
Extends "Cleanup" in Mail::Box::Locker.
.ie n .IP $obj\->\fBDESTROY\fR() 4
.el .IP \f(CW$obj\fR\->\fBDESTROY\fR() 4
.IX Item "$obj->DESTROY()"
Inherited, see "Cleanup" in Mail::Box::Locker
.SH DIAGNOSTICS
.IX Header "DIAGNOSTICS"
.ie n .IP "Fault: Will never get a FcntlLock lock at $file for $folder: $!" 4
.el .IP "Fault: Will never get a FcntlLock lock at \f(CW$file\fR for \f(CW$folder:\fR $!" 4
.IX Item "Fault: Will never get a FcntlLock lock at $file for $folder: $!"
Tried to lock the \f(CW$folder\fR, 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 \f(CWlock()\fR
.ie n .IP "Error: class $package does not implement method $method." 4
.el .IP "Error: class \f(CW$package\fR does not implement method \f(CW$method\fR." 4
.IX Item "Error: class $package does not implement method $method."
Fatal error: the specific \f(CW$package\fR (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 \f(CWnotImplemented()\fR
.ie n .IP "Warning: folder $name already lockf\*(Aqd." 4
.el .IP "Warning: folder \f(CW$name\fR already lockf\*(Aqd." 4
.IX Item "Warning: folder $name already lockf'd."
Cast by \f(CWlock()\fR
.ie n .IP "Fault: unable to check lock file $file for $folder: $!" 4
.el .IP "Fault: unable to check lock file \f(CW$file\fR for \f(CW$folder:\fR $!" 4
.IX Item "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.
.ie n .IP "Fault: unable to open FcntlLock lock file $file for $folder" 4
.el .IP "Fault: unable to open FcntlLock lock file \f(CW$file\fR for \f(CW$folder\fR" 4
.IX Item "Fault: unable to open FcntlLock lock file $file for $folder"
For FcntlLock style locking, a \f(CW$folder\fR it must be opened, which does not
succeed for the specified reason.
Cast by \f(CWlock()\fR
.SH "SEE ALSO"
.IX Header "SEE ALSO"
This module is part of Mail\-Box version 4.02,
built on April 10, 2026. Website: \fIhttp://perl.overmeer.net/CPAN/\fR
.SH LICENSE
.IX Header "LICENSE"
For contributors see file ChangeLog.
.PP
This software is copyright (c) 2001\-2026 by Mark Overmeer.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.