| 1 | # |
| 2 | # This library is no longer being maintained, and is included for backward |
| 3 | # compatibility with Perl 4 programs which may require it. |
| 4 | # |
| 5 | # In particular, this should not be used as an example of modern Perl |
| 6 | # programming techniques. |
| 7 | # |
| 8 | # Suggested alternative: FileCache |
| 9 | |
| 10 | # Open in their package. |
| 11 | |
| 12 | sub cacheout'open { |
| 13 | open($_[0], $_[1]); |
| 14 | } |
| 15 | |
| 16 | # Close as well |
| 17 | |
| 18 | sub cacheout'close { |
| 19 | close($_[0]); |
| 20 | } |
| 21 | |
| 22 | # But only this sub name is visible to them. |
| 23 | |
| 24 | sub cacheout { |
| 25 | package cacheout; |
| 26 | |
| 27 | ($file) = @_; |
| 28 | if (!$isopen{$file}) { |
| 29 | if (++$numopen > $maxopen) { |
| 30 | local(@lru) = sort {$isopen{$a} <=> $isopen{$b};} keys(%isopen); |
| 31 | splice(@lru, $maxopen / 3); |
| 32 | $numopen -= @lru; |
| 33 | for (@lru) { &close($_); delete $isopen{$_}; } |
| 34 | } |
| 35 | &open($file, ($saw{$file}++ ? '>>' : '>') . $file) |
| 36 | || die "Can't create $file: $!\n"; |
| 37 | } |
| 38 | $isopen{$file} = ++$seq; |
| 39 | } |
| 40 | |
| 41 | package cacheout; |
| 42 | |
| 43 | $seq = 0; |
| 44 | $numopen = 0; |
| 45 | |
| 46 | if (open(PARAM,'/usr/include/sys/param.h')) { |
| 47 | local($_, $.); |
| 48 | while (<PARAM>) { |
| 49 | $maxopen = $1 - 4 if /^\s*#\s*define\s+NOFILE\s+(\d+)/; |
| 50 | } |
| 51 | close PARAM; |
| 52 | } |
| 53 | $maxopen = 16 unless $maxopen; |
| 54 | |
| 55 | 1; |