From: "Firestone, Mark - Technical Support" <mark.firestone@...>
Date: 2002-06-21T20:57:57+09:00
Subject: detecting a socket dropping in multi-threaded app

I'm still working on my Ruby BBS project.  I need to be able to run some
code when a user drops offline without logging off.  Right now, Ruby is just
killing the thread.  I need to know how to make it pass an exception (or
something) back to the main loop so the main loop can take the user out of
the online user database.  I've tried testing for nil and raising an
exception, but it doesn't seem to work.  Help please!! You guys never let me
down.

thanks in advance!

Mark


def getstr(echo,wrapon,width)			# Input  a line a character
at a time. 

  whole	= "" 
  fred		= "" 
  i		= 0
  wlen	= 0
  suppress	= false					#This is to prevent
telnet control codes from being treated as user input
  
 

    if @wrap != nil					#taking the length
of a nil is bad.  we must test for this or BOOM!
    whole = @wrap 
      i = whole.length
    end
    
   @wrap = ''
   @socket.write whole

    @socket.each_byte do  | fred| 
       
        case fred 
	  when TELNETCMD
	   suppress = true
	   
          when  PRINTABLE 
	   i = i + 1
	   if !suppress then
	    whole = whole + fred.chr 
            if echo then @socket.write fred.chr else @socket.write
NOECHOCHAR.chr end 
	   end
	   if wrapon
	   if (i >= width)  then
           if fred != 32
	   wlen = 0
	   @wrap = whole.scan(/\w+/).last 
	     wlen = @wrap.length if @wrap != nil
	     wlen.times { @socket.write BS.chr }
	     wlen.times { @socket.write " " }
	     @socket.write CR.chr+LF.chr 
	     endbit = whole.length - wlen
	     #puts "endbit: #{endbit}"
	     #puts "whole: #{whole}"
	     whole.slice!(endbit..whole.length) 
	    #puts "whole: #{whole}"
          break 
	    end
	    @socket.write CR.chr+LF.chr 
	   break
	  end
	  end

          when CR 
           @socket.write CR.chr+LF.chr 
          break 
	  
          when BS  
	   if i >= 1 
            whole.chop!					#the user pressed
backspace, so get rid 
	    i = i - 1
            @socket.write fred.chr 
	  end
	 
          when DBS 
	   if i >= 1 
            whole.chop!					#for UNIX based
Telnet 
	     i = i - 1
            @socket.write BS.chr
	  end 	#of if
      
        end		#of case
	
	if fred < 250 then suppress = false 
      end

       end #of iterator

  @socket.flush 
  getstr = whole 
 end 

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