FileCache(3)

NNAAMMEE
       FileCache - keep more files open than the system permits

SSYYNNOOPPSSIISS
           cacheout $path;
           print $path @data;

DDEESSCCRRIIPPTTIIOONN
       The cacheout function will make sure that there's a
       filehandle open for writing available as the pathname you
       give it.  It automatically closes and re-opens files if
       you exceed your system file descriptor maximum.

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