| 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; |
