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.TH FileCache 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
FileCache \- keep more files open than the system permits
\& use FileCache maxopen => 16;
\& cacheout $mode, $path;
\& $fh = cacheout $mode, $path;
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
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.
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'>'\fR, \f(CW'+>'\fR, \f(CW'<'\fR, \f(CW'<+'\fR, \f(CW'>>'\fR,
\&\f(CW '|\-' \fR and \f(CW '\-|' \fR
To pass supplemental arguments to a program opened with \f(CW '|\-' \fR or \f(CW '\-|' \fR
append them to the command string as you would system \s-1EXPR\s0.
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.
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.
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.
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.
\&\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.
projects / OpenSPARC-T2-SAM / blob