/usr/share/perl5/TakTuk/Select.pm is in libtaktuk-perl 3.7.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# #
# TakTuk, a middleware for adaptive large scale parallel remote executions #
# deployment. Perl implementation, copyright(C) 2006 Guillaume Huard. #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either version 2 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA #
# #
# Contact: Guillaume.Huard@imag.fr #
# Laboratoire LIG - ENSIMAG - Antenne de Montbonnot #
# 51 avenue Jean Kuntzmann #
# 38330 Montbonnot Saint Martin #
# FRANCE #
# #
###############################################################################
package TakTuk::Select;
# Creates an empty select object
sub new();
# Adds a descriptor to the set listened by the select
sub add($);
# Removes a descriptor from the select set
# Returns false if the descriptor is not in the set
sub remove($);
# select call
# as in IO::Select, returns an array of three references to arrays
sub select($$$$);
# returns the array of registered handles
sub handles();
###############################################
### TAKTUK ###
### base protocol encoding ###
### This is also the exported package for ###
### external communication (which explains ###
### the name) ###
###############################################
package TakTuk::Select;
use strict; use bytes;
use constant EDESIS=>1;
use constant EDESNF=>2;
use constant EDESNS=>3;
our @select_errors = (
"Descriptor already in set",
"Didn't found descriptor to remove",
"Descriptor not in set");
sub error_msg($) {
my $error = shift;
$error--;
if ($error <= $#select_errors) {
return $select_errors[$error];
} else {
return "Unknown error";
}
}
sub new () {
my $class = shift;
my $data = { vector=>'', handles=>[] };
bless $data, $class;
return $data;
}
sub add ($) {
my $self = shift;
my $handle = shift;
if (vec($self->{vector}, fileno($handle), 1) == 0) {
vec($self->{vector}, fileno($handle), 1) = 1;
push @{$self->{handles}}, $handle;
return 0;
} else {
return EDESIS;
}
}
sub remove ($) {
my $self = shift;
my $handle = shift;
my $i=0;
my $handles_list = $self->{handles};
if (vec($self->{vector}, fileno($handle), 1) == 1) {
vec($self->{vector}, fileno($handle), 1) = 0;
while (($i <= $#$handles_list) and ($handles_list->[$i] != $handle)) {
$i++;
}
if ($i <= $#$handles_list) {
splice @$handles_list, $i, 1;
return 0;
} else {
return EDESNF;
}
} else {
return EDESNS;
}
}
sub select ($$$$) {
my $read_select = shift;
my $write_select = shift;
my $except_select = shift;
my $timeout = shift;
my $rin = defined($read_select)?$read_select->{vector}:undef;
my $win = defined($write_select)?$write_select->{vector}:undef;
my $ein = defined($except_select)?$except_select->{vector}:undef;
my $rout;
my $wout;
my $eout;
my ($nfound, $timeleft) =
CORE::select($rout=$rin, $wout=$win, $eout=$ein, $timeout);
if ($nfound == -1) {
return ();
} elsif ($nfound == 0) {
return ([],[],[]);
} else {
my $read_set = [];
my $write_set = [];
my $except_set = [];
my $handle;
foreach $handle (@{$read_select->{handles}}) {
push(@$read_set, $handle) if (vec($rout,fileno($handle),1) == 1);
}
foreach $handle (@{$write_select->{handles}}) {
push(@$write_set, $handle) if (vec($wout,fileno($handle),1) == 1);
}
foreach $handle (@{$except_select->{handles}}) {
push(@$except_set, $handle) if (vec($eout,fileno($handle),1) == 1);
}
return ($read_set, $write_set, $except_set);
}
}
sub handles () {
my $self=shift;
return @{$self->{handles}};
}
###############################################
### ARGUMENTS ###
###############################################
1;
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