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.\" ========================================================================
.\"
.IX Title "FileCache 3"
.TH FileCache 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide"
.SH "NAME"
FileCache \- keep more files open than the system permits
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    use FileCache;
\&    # or
\&    use FileCache maxopen => 16;
.Ve
.PP
.Vb 2
\&    cacheout $path;
\&    print $path @data;
.Ve
.PP
.Vb 2
\&    cacheout $mode, $path;
\&    print $path @data;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`cacheout\*(C'\fR function will make sure that there's a filehandle open
for reading or writing available as the pathname you give it. It
automatically closes and re-opens files if you exceed  your system's
maximum number of file descriptors, or the suggested maximum.
.IP "cacheout \s-1EXPR\s0" 4
.IX Item "cacheout EXPR"
The 1\-argument form of cacheout will open a file for writing (\f(CW'>'\fR)
on it's first use, and appending (\f(CW'>>'\fR) thereafter.
.IP "cacheout \s-1MODE\s0, \s-1EXPR\s0" 4
.IX Item "cacheout MODE, EXPR"
The 2\-argument form of cacheout will use the supplied mode for the initial
and subsequent openings. Most valid modes for 3\-argument \f(CW\*(C`open\*(C'\fR are supported
namely; \f(CW'>'\fR, \f(CW'+>'\fR, \f(CW'<'\fR, \f(CW'<+'\fR, \f(CW'>>'\fR,
\&\f(CW '|\-' \fR and \f(CW '\-|' \fR
.SH "CAVEATS"
.IX Header "CAVEATS"
If you use cacheout with \f(CW'|\-'\fR or \f(CW'\-|'\fR you should catch \s-1SIGPIPE\s0
and explicitly close the filehandle., when it is closed from the
other end some cleanup needs to be done.
.Sp
While it is permissible to \f(CW\*(C`close\*(C'\fR a FileCache managed file,
do not do so if you are calling \f(CW\*(C`FileCache::cacheout\*(C'\fR from a package other
than which it was imported, or with another module which overrides \f(CW\*(C`close\*(C'\fR.
If you must, use \f(CW\*(C`FileCache::cacheout_close\*(C'\fR.
.SH "BUGS"
.IX Header "BUGS"
\&\fIsys/param.h\fR lies with its \f(CW\*(C`NOFILE\*(C'\fR define on some systems,
so you may have to set maxopen (\fI$FileCache::cacheout_maxopen\fR) yourself.