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# Open in their package.
sub cacheout'open {
open($_[0], $_[1]);
}
# Close as well
sub cacheout'close {
close($_[0]);
}
# But only this sub name is visible to them.
sub cacheout {
package cacheout;
($file) = @_;
if (!$isopen{$file}) {
if (++$numopen > $maxopen) {
local(@lru) = sort {$isopen{$a} <=> $isopen{$b};} keys(%isopen);
splice(@lru, $maxopen / 3);
$numopen -= @lru;
for (@lru) { &close($_); delete $isopen{$_}; }
}
&open($file, ($saw{$file}++ ? '>>' : '>') . $file)
|| die "Can't create $file: $!\n";
}
$isopen{$file} = ++$seq;
}
package cacheout;
$seq = 0;
$numopen = 0;
if (open(PARAM,'/usr/include/sys/param.h')) {
local($.);
while (<PARAM>) {
$maxopen = $1 - 4 if /^\s*#\s*define\s+NOFILE\s+(\d+)/;
}
close PARAM;
}
$maxopen = 16 unless $maxopen;
1;
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