Commit | Line | Data |
---|---|---|
a6d71656 GS |
1 | # |
2 | # This library is no longer being maintained, and is included for backward | |
3 | # compatibility with Perl 4 programs which may require it. | |
e879c7c6 S |
4 | # This legacy library is deprecated and will be removed in a future |
5 | # release of perl. | |
a6d71656 GS |
6 | # |
7 | # In particular, this should not be used as an example of modern Perl | |
8 | # programming techniques. | |
9 | # | |
10 | # Suggested alternative: FileCache | |
11 | ||
39c3038c LW |
12 | # Open in their package. |
13 | ||
14 | sub cacheout'open { | |
15 | open($_[0], $_[1]); | |
16 | } | |
17 | ||
a0d0e21e LW |
18 | # Close as well |
19 | ||
20 | sub cacheout'close { | |
21 | close($_[0]); | |
22 | } | |
23 | ||
39c3038c LW |
24 | # But only this sub name is visible to them. |
25 | ||
26 | sub cacheout { | |
27 | package cacheout; | |
28 | ||
29 | ($file) = @_; | |
39c3038c LW |
30 | if (!$isopen{$file}) { |
31 | if (++$numopen > $maxopen) { | |
55204971 | 32 | local(@lru) = sort {$isopen{$a} <=> $isopen{$b};} keys(%isopen); |
39c3038c LW |
33 | splice(@lru, $maxopen / 3); |
34 | $numopen -= @lru; | |
a0d0e21e | 35 | for (@lru) { &close($_); delete $isopen{$_}; } |
39c3038c LW |
36 | } |
37 | &open($file, ($saw{$file}++ ? '>>' : '>') . $file) | |
38 | || die "Can't create $file: $!\n"; | |
39 | } | |
40 | $isopen{$file} = ++$seq; | |
41 | } | |
42 | ||
43 | package cacheout; | |
44 | ||
45 | $seq = 0; | |
46 | $numopen = 0; | |
47 | ||
48 | if (open(PARAM,'/usr/include/sys/param.h')) { | |
7adad424 | 49 | local($_, $.); |
39c3038c | 50 | while (<PARAM>) { |
55204971 | 51 | $maxopen = $1 - 4 if /^\s*#\s*define\s+NOFILE\s+(\d+)/; |
39c3038c LW |
52 | } |
53 | close PARAM; | |
54 | } | |
55 | $maxopen = 16 unless $maxopen; | |
56 | ||
57 | 1; |