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.\" ========================================================================
.\"
.IX Title "FileCache 3"
.TH FileCache 3 "2012-10-11" "perl v5.12.5" "Perl Programmers Reference Guide"
.\" 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"
FileCache \- keep more files open than the system permits
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    no strict \*(Aqrefs\*(Aq;
\&
\&    use FileCache;
\&    # or
\&    use FileCache maxopen => 16;
\&
\&    cacheout $mode, $path;
\&    # or
\&    cacheout $path;
\&    print $path @data;
\&
\&    $fh = cacheout $mode, $path;
\&    # or
\&    $fh = cacheout $path;
\&    print $fh @data;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`cacheout\*(C'\fR function will make sure that there's a filehandle open
for reading or writing available as the pathname you give it. It
automatically closes and re-opens files if you exceed your system's
maximum number of file descriptors, or the suggested maximum \fImaxopen\fR.
.IP "cacheout \s-1EXPR\s0" 4
.IX Item "cacheout EXPR"
The 1\-argument form of cacheout will open a file for writing (\f(CW\*(Aq>\*(Aq\fR)
on it's first use, and appending (\f(CW\*(Aq>>\*(Aq\fR) thereafter.
.Sp
Returns \s-1EXPR\s0 on success for convenience. You may neglect the
return value and manipulate \s-1EXPR\s0 as the filehandle directly if you prefer.
.IP "cacheout \s-1MODE\s0, \s-1EXPR\s0" 4
.IX Item "cacheout MODE, EXPR"
The 2\-argument form of cacheout will use the supplied mode for the initial
and subsequent openings. Most valid modes for 3\-argument \f(CW\*(C`open\*(C'\fR are supported
namely; \f(CW\*(Aq>\*(Aq\fR, \f(CW\*(Aq+>\*(Aq\fR, \f(CW\*(Aq<\*(Aq\fR, \f(CW\*(Aq<+\*(Aq\fR, \f(CW\*(Aq>>\*(Aq\fR,
\&\f(CW \*(Aq|\-\*(Aq \fR and \f(CW \*(Aq\-|\*(Aq \fR
.Sp
To pass supplemental arguments to a program opened with \f(CW \*(Aq|\-\*(Aq \fR or \f(CW \*(Aq\-|\*(Aq \fR
append them to the command string as you would system \s-1EXPR\s0.
.Sp
Returns \s-1EXPR\s0 on success for convenience. You may neglect the
return value and manipulate \s-1EXPR\s0 as the filehandle directly if you prefer.
.SH "CAVEATS"
.IX Header "CAVEATS"
While it is permissible to \f(CW\*(C`close\*(C'\fR a FileCache managed file,
do not do so if you are calling \f(CW\*(C`FileCache::cacheout\*(C'\fR from a package other
than which it was imported, or with another module which overrides \f(CW\*(C`close\*(C'\fR.
If you must, use \f(CW\*(C`FileCache::cacheout_close\*(C'\fR.
.PP
Although FileCache can be used with piped opens ('\-|' or '|\-') doing so is
strongly discouraged.  If FileCache finds it necessary to close and then reopen
a pipe, the command at the far end of the pipe will be reexecuted \- the results
of performing \s-1IO\s0 on FileCache'd pipes is unlikely to be what you expect.  The
ability to use FileCache on pipes may be removed in a future release.
.PP
FileCache does not store the current file offset if it finds it necessary to
close a file.  When the file is reopened, the offset will be as specified by the
original \f(CW\*(C`open\*(C'\fR file mode.  This could be construed to be a bug.
.PP
The module functionality relies on symbolic references, so things will break
under 'use strict' unless 'no strict \*(L"refs\*(R"' is also specified.
.SH "BUGS"
.IX Header "BUGS"
\&\fIsys/param.h\fR lies with its \f(CW\*(C`NOFILE\*(C'\fR define on some systems,
so you may have to set \fImaxopen\fR yourself.


.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	runtime/perl-512
=
Stability	Uncommitted
.TE 
.PP

.SH NOTES

.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.cpan.org/src/5.0/perl-5.12.5.tar.bz2

Further information about this software can be found on the open source community website at http://www.perl.org/.