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# -*- coding: utf-8 -*- |
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# Copyright (C) 2014 Rocky Bernstein <rocky@cpan.org> |
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# Debugger Server Input/Output FIFO interface. |
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5234
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use warnings; use strict; |
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use rlib '../../..'; |
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package Devel::Trepan::IO::FIFOServer; |
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3808
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use English qw ( -no_match_vars ); |
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use Fcntl; |
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use Devel::Trepan::IO::TCPPack; |
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use Devel::Trepan::Util qw(hash_merge); |
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# use File::Temp qw(tempdir); |
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# use File::Spec::Functions qw(catfile); |
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use POSIX qw(mkfifo); |
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12676
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use constant DEFAULT_INIT_OPTS => { |
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open => 1, |
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logger => undef, # Complaints should be sent here. |
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# input and output names are the reverse of the client |
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input_name => '/tmp/trepanpl.inputfifo', |
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input_mode => 0777, |
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input => undef, |
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output_name => '/tmp/trepanpl.outputfifo', |
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output_mode => 0777, |
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output => undef, |
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reuse => 1, |
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# name_pat pattern to go into tmmname |
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1090
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}; |
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sub new($;$) |
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{ |
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0
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my ($class, $opts) = @_; |
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0
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$opts = hash_merge($opts, DEFAULT_INIT_OPTS); |
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my $self = { |
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input => undef, |
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input_name => $opts->{input_name}, |
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input_mode => $opts->{input_mode}, |
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output => undef, |
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output_name => $opts->{output_name}, |
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output_mode => $opts->{output_mode}, |
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state => 'uninit', |
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logger => $opts->{logger}, |
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0
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line_edit => 0 |
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}; |
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0
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bless $self, $class; |
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0
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0
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$self->open($opts) if $opts->{open}; |
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return $self; |
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} |
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sub is_connected($) |
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{ |
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my $self = shift; |
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$self->{state} = 'connected' if |
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$self->{input} and $self->{output}; |
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return $self->{state} eq 'connected'; |
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} |
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sub is_interactive($) { |
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0; |
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} |
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sub have_term_readline($) |
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{ |
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return 0; |
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} |
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# Closes server connection. |
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# FIXME dry with FIFOClient by making a common FIFO routine |
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sub close |
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{ |
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my $self = shift; |
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$self->{state} = 'closing'; |
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foreach my $FIFO ( $self->{input}, $self->{output} ) { |
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close($FIFO) if $FIFO; |
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} |
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$self->{state} = 'uninit'; |
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$self->{input} = $self->{output} = undef; |
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print {$self->{logger}} "Disconnected FIFO server\n" if $self->{logger}; |
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} |
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sub open($;$) |
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{ |
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my ($self, $opts) = @_; |
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$opts = hash_merge($self, $opts); |
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foreach my $tuple ( [$opts->{input_name}, $opts->{input_mode}], |
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[$opts->{output_name}, $opts->{output_mode}] ) { |
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my ($named_pipe, $create_mode) = @$tuple; |
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if ( -p $named_pipe ) { |
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die "FIFO $named_pipe already exists" unless $opts->{reuse}; |
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} else { |
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0
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0
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POSIX::mkfifo($named_pipe, $create_mode) |
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or die "mkfifo($named_pipe) failed: $!"; |
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} |
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} |
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0
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sysopen($self->{output}, $self->{output_name}, O_RDWR) or |
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die "Can't open $self->{output_name} for writing; $!"; |
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107
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# Flush output as soon as possbile (autoflush). |
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0
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my $oldfh = select($self->{output}); |
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$OUTPUT_AUTOFLUSH = 1; |
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select($oldfh); |
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0
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$self->{state} = 'listening'; |
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} |
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115
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# Read one message unit. |
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# EOFError will be raised on EOF. |
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sub read_msg($) |
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{ |
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my($self) = @_; |
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my $fh = $self->{input}; |
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unless ($fh) { |
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0
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print {$self->{logger}} "read on disconnected input\n" if $self->{logger}; |
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123
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0
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return ''; |
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} |
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# print "+++ server self input ($self->{input_name}) ", $fh, "\n"; |
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0
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my $msg; |
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0
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unless (eof($fh)) { |
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$msg = <$fh>; |
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} |
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0
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0
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if ($msg ne '-1') { |
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0
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return unpack_msg($msg); |
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} else { |
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0
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0
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print {$self->{logger}} "Client disconnected\n" if $self->{logger}; |
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134
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0
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return unpack_msg(''); |
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0
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die "Remote has closed connection"; |
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} |
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} |
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139
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# This method the debugger uses to write. In contrast to |
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# writeline, no newline is added to the } to `str'. Also |
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# msg doesn't have to be a string. |
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# FIXME dry with FIFOClient by making a common FIFO routine |
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sub write($$) |
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{ |
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0
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my($self, $msg) = @_; |
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# print "+++ server self output ($self->{output_name})\n"; |
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0
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syswrite($self->{output}, pack_msg($msg) . "\n"); |
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} |
149
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150
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# FIXME dry with FIFOClient by making a common FIFO routine |
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sub writeline($$) |
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{ |
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0
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my($self, $msg) = @_; |
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0
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$self->write($msg . "\n"); |
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} |
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157
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# Demo |
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unless (caller) { |
159
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my $server = __PACKAGE__->new({open => 1, logger=>*STDOUT}); |
160
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if (scalar @ARGV) { |
161
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require Devel::Trepan::IO::FIFOClient; |
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my $pid = fork(); |
163
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if (scalar @ARGV) { |
164
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my $pid = fork(); |
165
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if ($pid) { |
166
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print "Server pid $$...\n"; |
167
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my $client = __PACKAGE__->new({'open' => 1}); |
168
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print "server before write\n"; |
169
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$server->writeline("server to client"); |
170
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print "server before read\n"; |
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my $msg = $server->read_msg(); |
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print "Server read from client message: $msg\n"; |
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print "server before second write\n"; |
174
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$server->write("server to client nocr"); |
175
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print "Server $$ is done but waiting on client $pid\n"; |
176
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waitpid($pid, 0); |
177
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$server->close(); |
178
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print "Server is leaving\n"; |
179
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} else { |
180
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print "Client pid $$...\n"; |
181
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my $client = Devel::Trepan::IO::FIFOClient->new({'open'=> 1}); |
182
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print "client before read\n"; |
183
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my $msg = $client->read_msg(); |
184
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print "Client read from server message: $msg\n"; |
185
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$client->writeline("client to server"); |
186
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print "client before second read\n"; |
187
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$msg = $client->read_msg(); |
188
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print "Client read from server message: $msg\n"; |
189
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print "Client is leaving\n"; |
190
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$client->close(); |
191
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} |
192
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} else { |
193
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my $client = __PACKAGE__->new({'open' => 1}); |
194
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$client->close(); |
195
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} |
196
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} |
197
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} |
198
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199
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1; |