From: BCoish@... (Brad)
Date: 2003-11-27T02:57:14+09:00
Subject: TCP/IP in Ruby

All:

I've run into a problem that I'm hoping is not unique.
I am learning TCP/IP programming in Ruby and the
following code generates a strange result:


# CLIENT.RB
# =========
require 'socket'
s=TCPSocket.new("localhost", ARGV[0])
s.write("test\n")
puts s.gets
# 2nd read required to retrieve
# modified string from server.
# puts s.gets

s.close

# SERVER.RB
# =========
require "socket"
gs = TCPserver.open(0)
printf("server is on port %d\n", gs.addr[1])
s=gs.accept
puts s.gets
s.write(s.gets.upcase)
s.close


The preceeding code is used to run a server that accepts a 
single client. The client sends the server a string, the 
server reads and converts the string to uppercase and then 
sends it back to the client.

That's how it's supposed to work and on the PC it does work.  
However, on OpenVMS the client requires two, consecutive reads 
in order to get the uppercased value from the server (i.e. first 
read returns the original string "test"; second read returns the 
modified string sent back by the server "TEST").  This leads me 
to believe it's an internal buffer problem. Before I speculate 
further I wanted to ask if anyone has come across this before and 
what may be the cause of it.

Regards,
Brad
BCoish@Dymaxion.com