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code |
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1
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2
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package Net::Link; |
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3
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4
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1
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1
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35995
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use strict; |
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1
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4
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1
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47
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5
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1
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1
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6
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use warnings; |
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1
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2
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1
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30
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6
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7
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1
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1
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2340
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use Net::Interface; |
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0
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0
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8
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use Carp; |
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9
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use IO::File; |
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10
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11
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our $VERSION = '0.01'; |
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12
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13
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our @ISA = qw( Net::Interface ); |
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14
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15
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croak(__PACKAGE__ . " requires Linux") if $^O ne 'linux'; |
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16
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croak(__PACKAGE__ . " requires /sys/") unless -d '/sys/'; |
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17
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18
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sub up { |
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19
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my ($self) = @_; |
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20
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21
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my $carrier = '/sys/class/net/' . $self->name . '/carrier'; |
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22
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23
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my $io = new IO::File($carrier); |
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24
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if($io) { |
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25
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my $line = $io->getline; |
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26
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return ($line and $line =~ /^1/); |
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27
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} |
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28
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29
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return; |
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30
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} |
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31
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32
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33
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sub down { return ! $_[0]->up } |
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34
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35
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36
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!0; |
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37
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38
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39
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__END__ |