/usr/share/perl5/Mail/SpamAssassin/SubProcBackChannel.pm is in spamassassin 3.4.2-0ubuntu0.14.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | # back-channel for communication between a master and multiple slave processes.
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
package Mail::SpamAssassin::SubProcBackChannel;
use strict;
use warnings;
# use bytes;
use re 'taint';
use IO::Socket;
use Mail::SpamAssassin::Util;
use Mail::SpamAssassin::Constants qw(:sa);
our @ISA = qw();
=head1 NAME
Mail::SpamAssassin::SubProcBackChannel - back-channel for communication between a master and multiple slave processes
=head1 METHODS
=cut
###########################################################################
sub new {
my $class = shift;
$class = ref($class) || $class;
my $self = shift;
if (!defined $self) { $self = { }; }
bless ($self, $class);
$self->{kids} = { };
$self->{fileno_to_fh} = { };
$self;
}
###########################################################################
sub set_selector {
my ($self, $sel) = @_;
$self->{selector} = $sel;
}
sub setup_backchannel_parent_pre_fork {
my ($self) = @_;
my $io = IO::Socket->new();
($self->{latest_kid_fh}, $self->{parent}) =
$io->socketpair(AF_UNIX,SOCK_STREAM,PF_UNSPEC)
or die "backchannel: socketpair failed: $!";
# set those to use non-blocking I/O
$self->{parent}->blocking(0)
or die "backchannel: set non-blocking failed: $!";
$self->{latest_kid_fh}->blocking(0)
or die "backchannel: set non-blocking failed: $!";
}
sub setup_backchannel_parent_post_fork {
my ($self, $pid) = @_;
my $fh = $self->{latest_kid_fh};
close $self->{parent} # because it's us!
or die "backchannel: error closing parent side of the pipe: $!";
# disable caching for parent<->child relations
my ($old) = select($fh);
$| = 1; # turn off buffering
select($old);
$self->{kids}->{$pid} = $fh;
$self->add_to_selector($fh);
}
sub add_to_selector {
my ($self, $fh) = @_;
if (!defined $fh) {
warn "undef fh in add_to_selector"; return;
}
my $fno = fileno($fh);
$self->{fileno_to_fh}->{$fno} = $fh;
vec (${$self->{selector}}, $fno, 1) = 1;
}
sub remove_from_selector {
my ($self, $fh) = @_;
if (!defined $fh) {
warn "undef fh in remove_from_selector"; return;
}
my $fno = fileno($fh);
delete $self->{fileno_to_fh}->{$fno};
vec (${$self->{selector}}, $fno, 1) = 0;
}
sub select_vec_to_fh_list {
my ($self, $vec) = @_;
my $i = -1;
# grotesque hackery alert! ;) turn the vec() map of fds into a list of
# filehandles. note that filenos that don't have a filehandle in the
# {fileno_to_fh} hash will be ignored; this is by design, so that other fhs
# can be selected on using the same vec, and the caller can just check for
# those in their own code, before they fall back to using this method.
return grep {
defined
} map {
$i++;
($_ ? $self->{fileno_to_fh}->{$i} : undef);
} split (//, unpack ("b*", $vec));
}
sub get_socket_for_child {
my ($self, $pid) = @_;
return $self->{kids}->{$pid};
}
sub delete_socket_for_child {
my ($self, $pid) = @_;
delete $self->{kids}->{$pid};
}
###########################################################################
sub setup_backchannel_child_post_fork {
my ($self) = @_;
close $self->{latest_kid_fh} # because it's us!
or die "backchannel: error closing child side of the pipe: $!";
my $old = select($self->{parent});
$| = 1; # print to parent by default, turn off buffering
select($old);
}
sub get_parent_socket {
my ($self) = @_;
return $self->{parent};
}
############################################################################
1;
__END__
=head1 SEE ALSO
C<Mail::SpamAssassin>
C<Mail::SpamAssassin::ArchiveIterator>
C<Mail::SpamAssassin::SpamdPreforkScaling>
C<spamassassin>
C<spamd>
C<mass-check>
|