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|
#! /usr/bin/perl
package Apache::Resource;
use strict;
use vars qw($Debug);
use BSD::Resource qw(setrlimit getrlimit get_rlimits);
$Debug ||= 0;
$Apache::Resource::VERSION = '1.71';
sub MB ($) {
my $num = shift;
return ($num < (1024 * 1024)) ? $num*1024*1024 : $num;
}
sub BM ($) {
my $num = shift;
return ($num > (1024 * 1024)) ? '(' . ($num>>20) . 'Mb)' : '';
}
sub DEFAULT_RLIMIT_DATA () { 64 } #data (memory) size in MB
sub DEFAULT_RLIMIT_CPU () { 60*6 } #cpu time in seconds
sub DEFAULT_RLIMIT_CORE () { 0 } #core file size (MB)
sub DEFAULT_RLIMIT_RSS () { 16 } #resident set size (MB)
sub DEFAULT_RLIMIT_FSIZE () { 10 } #file size (MB)
sub DEFAULT_RLIMIT_STACK () { 20 } #stack size (MB)
my %is_mb = map {$_,1} qw{DATA RSS STACK FSIZE CORE MEMLOCK};
sub debug { print STDERR @_ if $Debug }
sub install_rlimit ($$$) {
my($res, $soft, $hard) = @_;
my $name = $res;
my $cv = \&{"BSD::Resource::RLIMIT_${res}"};
eval { $res = $cv->() };
return if $@;
unless ($soft) {
my $defval = \&{"DEFAULT_RLIMIT_${name}"};
if(defined &$defval) {
$soft = $defval->();
}
else {
warn "can't find default for `$defval'\n";
}
}
$hard ||= $soft;
debug "Apache::Resource: PID $$ attempting to set `$name'=$soft:$hard ...";
($soft, $hard) = (MB $soft, MB $hard) if $is_mb{$name};
return setrlimit $res, $soft, $hard;
}
sub handler {
while(my($k,$v) = each %ENV) {
next unless $k =~ /^PERL_RLIMIT_(\w+)$/;
$k = $1;
next if $k eq "DEFAULTS";
my($soft, $hard) = split ":", $v, 2;
$hard ||= $soft;
my $set = install_rlimit $k, $soft, $hard;
debug "not " unless $set;
debug "ok\n";
debug $@ if $@;
}
0;
}
sub default_handler {
while(my($k,$v) = each %Apache::Resource::) {
next unless $k =~ s/^DEFAULT_/PERL_/;
$ENV{$k} = "";
}
handler();
}
sub status_rlimit {
my $lim = get_rlimits();
my @retval = ("<table border=1><tr>",
(map "<th>$_</th>", qw(Resource Soft Hard)),
"</tr>");
for my $res (keys %$lim) {
my $val = eval "&BSD::Resource::${res}()";
my ($soft,$hard) = getrlimit $val;
(my $limit = $res) =~ s/^RLIMIT_//;
($soft, $hard) = ("$soft " . BM($soft),"$hard ". BM($hard))
if $is_mb{$limit};
push @retval,
"<tr>",
(map { "<td>$_</td>" } $res, $soft, $hard),
"</tr>";
}
push @retval, "</table><P>";
push @retval, "<SMALL>Apache::Resource $Apache::Resource::VERSION</SMALL>";
return \@retval;
}
if($ENV{MOD_PERL}) {
if($ENV{PERL_RLIMIT_DEFAULTS}) {
Apache->push_handlers(PerlChildInitHandler => \&default_handler);
}
Apache::Status->menu_item(rlimit => "Resource Limits",
\&status_rlimit)
if Apache->module("Apache::Status");
}
#perl Apache/Resource.pm
++$Debug, default_handler unless caller();
1;
__END__
=head1 NAME
Apache::Resource - Limit resources used by httpd children
=head1 SYNOPSIS
PerlModule Apache::Resource
#set child memory limit in megabytes
#default is 64 Meg
PerlSetEnv PERL_RLIMIT_DATA 32:48
#set child cpu limit in seconds
#default is 360 seconds
PerlSetEnv PERL_RLIMIT_CPU 120
PerlChildInitHandler Apache::Resource
=head1 DESCRIPTION
B<Apache::Resource> uses the B<BSD::Resource> module, which
uses the C function C<setrlimit> to set limits on
system resources such as memory and cpu usage.
Any B<RLIMIT> operation available to limit on your system can be set
by defining that operation as an environment variable with a C<PERL_>
prefix. See your system C<setrlimit> manpage for available resources
which can be limited.
The following limit values are in megabytes: C<DATA>, C<RSS>, C<STACK>,
C<FSIZE>, C<CORE>, C<MEMLOCK>; all others are treated as their natural unit.
If the value of the variable is of the form C<S:H>, C<S> is treated as
the soft limit, and C<H> is the hard limit. If it is just a single
number, it is used for both soft and hard limits.
=head1 DEFAULTS
To set reasonable defaults for all RLIMITs, add this to your httpd.conf:
PerlSetEnv PERL_RLIMIT_DEFAULTS On
PerlModule Apache::Resource
=head1 AUTHOR
Doug MacEachern
=head1 SEE ALSO
BSD::Resource(3), setrlimit(2)
=cut
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