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# IO::Select.pm
#
# Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

package IO::Select;

use     strict;
use warnings::register;
use     vars qw($VERSION @ISA);
require Exporter;

$VERSION = "1.22";

@ISA = qw(Exporter); # This is only so we can do version checking

sub VEC_BITS () {0}
sub FD_COUNT () {1}
sub FIRST_FD () {2}

sub new
{
 my $self = shift;
 my $type = ref($self) || $self;

 my $vec = bless [undef,0], $type;

 $vec->add(@_)
    if @_;

 $vec;
}

sub add
{
 shift->_update('add', @_);
}

sub remove
{
 shift->_update('remove', @_);
}

sub exists
{
 my $vec = shift;
 my $fno = $vec->_fileno(shift);
 return undef unless defined $fno;
 $vec->[$fno + FIRST_FD];
}

sub _fileno
{
 my($self, $f) = @_;
 return unless defined $f;
 $f = $f->[0] if ref($f) eq 'ARRAY';
 ($f =~ /^\d+$/) ? $f : fileno($f);
}

sub _update
{
 my $vec = shift;
 my $add = shift eq 'add';

 my $bits = $vec->[VEC_BITS];
 $bits = '' unless defined $bits;

 my $count = 0;
 my $f;
 foreach $f (@_)
  {
   my $fn = $vec->_fileno($f);
   if ($add) {
     next unless defined $fn;
     my $i = $fn + FIRST_FD;
     if (defined $vec->[$i]) {
	 $vec->[$i] = $f;  # if array rest might be different, so we update
	 next;
     }
     $vec->[FD_COUNT]++;
     vec($bits, $fn, 1) = 1;
     $vec->[$i] = $f;
   } else {      # remove
     if ( ! defined $fn ) { # remove if fileno undef'd
       $fn = 0;
       for my $fe (@{$vec}[FIRST_FD .. $#$vec]) {
         if (defined($fe) && $fe == $f) {
	   $vec->[FD_COUNT]--;
	   $fe = undef;
	   vec($bits, $fn, 1) = 0;
	   last;
	 }
	 ++$fn;
       }
     }
     else {
       my $i = $fn + FIRST_FD;
       next unless defined $vec->[$i];
       $vec->[FD_COUNT]--;
       vec($bits, $fn, 1) = 0;
       $vec->[$i] = undef;
     }
   }
   $count++;
  }
 $vec->[VEC_BITS] = $vec->[FD_COUNT] ? $bits : undef;
 $count;
}

sub can_read
{
 my $vec = shift;
 my $timeout = shift;
 my $r = $vec->[VEC_BITS];

 defined($r) && (select($r,undef,undef,$timeout) > 0)
    ? handles($vec, $r)
    : ();
}

sub can_write
{
 my $vec = shift;
 my $timeout = shift;
 my $w = $vec->[VEC_BITS];

 defined($w) && (select(undef,$w,undef,$timeout) > 0)
    ? handles($vec, $w)
    : ();
}

sub has_exception
{
 my $vec = shift;
 my $timeout = shift;
 my $e = $vec->[VEC_BITS];

 defined($e) && (select(undef,undef,$e,$timeout) > 0)
    ? handles($vec, $e)
    : ();
}

sub has_error
{
 warnings::warn("Call to deprecated method 'has_error', use 'has_exception'")
	if warnings::enabled();
 goto &has_exception;
}

sub count
{
 my $vec = shift;
 $vec->[FD_COUNT];
}

sub bits
{
 my $vec = shift;
 $vec->[VEC_BITS];
}

sub as_string  # for debugging
{
 my $vec = shift;
 my $str = ref($vec) . ": ";
 my $bits = $vec->bits;
 my $count = $vec->count;
 $str .= defined($bits) ? unpack("b*", $bits) : "undef";
 $str .= " $count";
 my @handles = @$vec;
 splice(@handles, 0, FIRST_FD);
 for (@handles) {
     $str .= " " . (defined($_) ? "$_" : "-");
 }
 $str;
}

sub _max
{
 my($a,$b,$c) = @_;
 $a > $b
    ? $a > $c
        ? $a
        : $c
    : $b > $c
        ? $b
        : $c;
}

sub select
{
 shift
   if defined $_[0] && !ref($_[0]);

 my($r,$w,$e,$t) = @_;
 my @result = ();

 my $rb = defined $r ? $r->[VEC_BITS] : undef;
 my $wb = defined $w ? $w->[VEC_BITS] : undef;
 my $eb = defined $e ? $e->[VEC_BITS] : undef;

 if(select($rb,$wb,$eb,$t) > 0)
  {
   my @r = ();
   my @w = ();
   my @e = ();
   my $i = _max(defined $r ? scalar(@$r)-1 : 0,
                defined $w ? scalar(@$w)-1 : 0,
                defined $e ? scalar(@$e)-1 : 0);

   for( ; $i >= FIRST_FD ; $i--)
    {
     my $j = $i - FIRST_FD;
     push(@r, $r->[$i])
        if defined $rb && defined $r->[$i] && vec($rb, $j, 1);
     push(@w, $w->[$i])
        if defined $wb && defined $w->[$i] && vec($wb, $j, 1);
     push(@e, $e->[$i])
        if defined $eb && defined $e->[$i] && vec($eb, $j, 1);
    }

   @result = (\@r, \@w, \@e);
  }
 @result;
}

sub handles
{
 my $vec = shift;
 my $bits = shift;
 my @h = ();
 my $i;
 my $max = scalar(@$vec) - 1;

 for ($i = FIRST_FD; $i <= $max; $i++)
  {
   next unless defined $vec->[$i];
   push(@h, $vec->[$i])
      if !defined($bits) || vec($bits, $i - FIRST_FD, 1);
  }
 
 @h;
}

1;
__END__


Filemanager

Name Type Size Permission Actions
Socket Folder 0755
Dir.pm File 5.24 KB 0644
File.pm File 1.63 KB 0644
Handle.pm File 8.04 KB 0644
Pipe.pm File 3.34 KB 0644
Poll.pm File 4.43 KB 0644
Seekable.pm File 686 B 0644
Select.pm File 4.26 KB 0644
Socket.pm File 9.23 KB 0644