FileCache(3)

NAME
FileCache - keep more files open than the system permits

SYNOPSIS
    use FileCache;
    # or
    use FileCache maxopen => 16;

    cacheout $path;
    print $path @data;

    cacheout $mode, $path;
    print $path @data;

DESCRIPTION
The "cacheout" 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.

cacheout EXPR
    The 1-argument form of cacheout will open a file for writing ('>') on it's first use, and appending ('>>') thereafter.

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 "open" are supported namely; '>', '+>', '<', '<+', '>>', '|-' and '-|'

CAVEATS
If you use cacheout with '|-' or '-|' you should catch SIGPIPE and explicitly close the filehandle., when it is closed from the other end some cleanup needs to be done.

While it is permissible to "close" a FileCache managed file, do not do so if you are calling "FileCache::cacheout" from a package other than which it was imported, or with another module which overrides "close". If you must, use "FileCache::cacheout_close".

BUGS
sys/param.h lies with its "NOFILE" define on some systems, so you may have to set maxopen ($FileCache::cacheout_maxopen) yourself.