2000-06-25 11:04:01 +00:00
|
|
|
#
|
|
|
|
|
# This library is no longer being maintained, and is included for backward
|
|
|
|
|
# compatibility with Perl 4 programs which may require it.
|
|
|
|
|
#
|
|
|
|
|
# In particular, this should not be used as an example of modern Perl
|
|
|
|
|
# programming techniques.
|
|
|
|
|
#
|
|
|
|
|
# Suggested alternative: FileCache
|
|
|
|
|
|
1998-09-09 07:00:04 +00:00
|
|
|
# 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;
|
