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.\" ========================================================================
.\"
.IX Title "File::Flock 3pm"
.TH File::Flock 3pm "2015-06-07" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
.Vb 1
\& File::Flock \- file locking with flock
.Ve
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use File::Flock;
\&
\& lock($filename);
\&
\& lock($filename, \*(Aqshared\*(Aq);
\&
\& lock($filename, undef, \*(Aqnonblocking\*(Aq);
\&
\& lock($filename, \*(Aqshared\*(Aq, \*(Aqnonblocking\*(Aq);
\&
\& unlock($filename);
\&
\& lock_rename($oldfilename, $newfilename)
\&
\& my $lock = new File::Flock \*(Aq/somefile\*(Aq;
\&
\& $lock\->unlock();
\&
\& $lock\->lock_rename(\*(Aq/new/file\*(Aq);
\&
\& forget_locks();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Lock files using the \fIflock()\fR call.  If the file to be locked does not
exist, then the file is created.  If the file was created then it will
be removed when it is unlocked assuming it's still an empty file.
.PP
Locks can be created by new'ing a \fBFile::Flock\fR object.  Such locks
are automatically removed when the object goes out of scope.  The
\&\fB\f(BIunlock()\fB\fR method may also be used.
.PP
\&\fB\f(BIlock_rename()\fB\fR is used to tell File::Flock when a file has been
renamed (and thus the internal locking data that is stored based
on the filename should be moved to a new name).  \fB\f(BIunlock()\fB\fR the
new name rather than the original name.
.PP
Locks are released on process exit when the process that created the
lock exits.  Subprocesses that exit do not remove locks.
Use \fIforget_locks()\fR or \fIPOSIX::_exit()\fR to prevent unlocking on process exit.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See File::Flock::Subprocess for a variant that uses a subprocess to hold
the locks so that the locks survive when the parent process forks.
See File::Flock::Forking for a way to automatically choose between
File::Flock and File::Flock::Subprocess.
.SH "LICENSE"
.IX Header "LICENSE"
Copyright (C) 1996\-2012 David Muir Sharnoff <cpan@dave.sharnoff.org>
Copyright (C) 2013 Google, Inc.
This module may be used/copied/etc on the same terms as Perl itself.
.SH "PACKAGERS"
.IX Header "PACKAGERS"
File::Flock is packaged for Fedora by Emmanuel Seyman <emmanuel.seyman@club\-internet.fr>.