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Asked: 2026-05-11T06:31:09+00:00

I’m trying to use select on STDIN and a TCP socket in Ruby, but

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I’m trying to use select on STDIN and a TCP socket in Ruby, but for some reason, the value returned from select never seems to match one of the choices; it looks like it’s the socket that’s being returned, but it doesn’t match using == (or equal?). Can anyone tell me why the result returned from select doesn’t match the objects I passed in, and what I should be doing differently here?

server = TCPSocket::new('irc.freenode.net', 7000) server.puts 'NICK MyBot' server.puts 'USER #{ENV['USER']} 0 * :My Bot'  # <snip definitions>  while (!$done)   results = select([server, STDIN], nil, nil)   if results[0] == STDIN     puts 'Reading from STDIN'     execute_command   elsif results[0] == server     puts 'Reading from server'     receive_data   else     puts 'Something's wrong... results[0]: #{results[0]}, server: #{server}'     puts 'IDs: results[0]: #{results[0].__id__}, server: #{server.__id__}'     exit 1   end end

Here’s what I get when I run this:

Something's wrong... results[0]: #<TCPSocket:0x33c390>, server: #<TCPSocket:0x33c390> IDs: results[0]: 1695840, server: 1695990

I’m running Ruby version 1.8.6 on Mac OS X.

$ ruby --version ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0] $ which ruby /usr/bin/ruby
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1 Answer

  1. The fist element of the Array returned by select is an Array of the IO objects that are ready. So you should compare the STDIN and server to results[0][0]. Or better check, if the socket is in the results Array

    ... if results[0].include? STDIN   ... elsif results[0].include? server   ... ...
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