From: Brian Candler <b.candler@...>
Date: 2011-03-17T06:30:47+09:00
Subject: Re: TCPSocket, send always transmit an even length message

I think you're using the wrong method.

'send' is a inherited method of BasicSocket, and calls 'sendto' in the 
underlying O/S. And the second argument is actually flags, not length.

/*
 * call-seq:
 *   basicsocket.send(mesg, flags [, dest_sockaddr]) => numbytes_sent
 *
 * send _mesg_ via _basicsocket_.
 *
 * _mesg_ should be a string.
 *
 * _flags_ should be a bitwise OR of Socket::MSG_* constants.
 *
 * _dest_sockaddr_ should be a packed sockaddr string or an addrinfo.
 *
 *   TCPSocket.open("localhost", 80) {|s|
 *     s.send "GET / HTTP/1.0\r\n\r\n", 0
 *     p s.read
 *   }
 */

Try setting flags to zero instead and it'll probably work:

>> require 'socket'
=> true
>> rx = TCPServer.new('127.0.0.1',2000)
=> #<TCPServer:0x7f354d04cd68>
>> tx = TCPSocket.new('127.0.0.1',2000)
=> #<TCPSocket:0x7f354d03e6c8>
>> s = rx.accept
=> #<TCPSocket:0x7f354d033ca0>
>> tx.send('ab', 0)
=> 2
>> tx.send('cde', 0)
=> 3
>> s.readpartial(1024)
=> "abcde"
>> RUBY_DESCRIPTION
=> "ruby 1.8.7 (2010-06-23 patchlevel 299) [x86_64-linux]"
>>

But really you should just be using 'write' not 'send', unless you're 
trying to do something funky like sending out-of-band data (MSG_OOB)

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