From: Serge Savoie <seurdge.sawa@...>
Date: 2008-10-01T22:33:47+09:00
Subject: Non blocking socket keep blocking on read ?

Hello everyone,

I have a problem with a socket that block (and my process alt) when the
server stop send me stuff. The server send me a couple of things ( file
name and so on ) and after that it send me a file ( a jpeg ). Everything
works ok but I have to force the read loop to break. How can I detect
that the server dont send me nothing anymore and break ? I was sure that
it will do it with connect_non_block ?

My problem is in the
while( buf = socket.readline )
it is where it hang when the server stop sending...

Here is my complete code...


    socket = Socket.new(AF_INET, SOCK_STREAM, 0)
    sockaddr = Socket.sockaddr_in(9401, '10.2.4.92')

    begin
      socket.connect_nonblock(sockaddr)
      rescue Errno::EINPROGRESS
       IO.select(nil, [socket])
       begin
         socket.connect_nonblock(sockaddr)
       rescue Errno::EISCONN
        end
     end

     puts "sending..."

    begin

       socket.write("207\n")
       socket.write("146316\n")
       socket.write( "89c38b1b197162cae874e5274963633f" + "\n")

       puts "receiving..."

       i=0
       while data = socket.readline
        puts "data : " + data

        if i == 0
          puts "Return code : " + data
        end

        if i ==  1
          puts "Bytes to receive : " + data
          nombre_bytes = data
        end

        if i == 2
          puts "File name : " + data
       end

        if i == 2
          break;
       end

        i = i+1

       end

     i = 0;
     while( buf = socket.readline )
        puts "here"
        puts buf
        puts " i = " + i.to_s;

        if( @imageData == nil )
          @imageData = buf
      else
            @imageData += buf
        end

        i = i + 1

        #I Dont want to do this
        #with this all works because I kow the the server ships
        #me the test file in 26 chunk
        #I wanna detect that readline read nothing instead !
        if( i == 27 )
          break;
        end



     end


      socket.close

      rescue Exception => exc
         puts "erreur #{exc.message}"
         puts exc.inspect
        socket.close


    end

  end


Thx for your comments !

Seurdge
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