From: "William E. Rubin" <williamerubin@...>
Date: 2005-12-09T04:07:35+09:00
Subject: invalid arg to sysread deep within protocol.rb

I just made a script that fetches certain web pages, using Net::HTTP,
over and over in a loop.  Everything worked fine, for about 5000
iterations, but then the following error was thrown (this is in Ruby
1.8.3):

C:/Ruby/lib/ruby/1.8/net/protocol.rb:133:in `sysread'
C:/Ruby/lib/ruby/1.8/net/protocol.rb:133:in `rbuf_fill'
C:/Ruby/lib/ruby/1.8/timeout.rb:45:in `timeout'
C:/Ruby/lib/ruby/1.8/timeout.rb:62:in `timeout'
C:/Ruby/lib/ruby/1.8/net/protocol.rb:132:in `rbuf_fill'
C:/Ruby/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
C:/Ruby/lib/ruby/1.8/net/protocol.rb:126:in `readline'
C:/Ruby/lib/ruby/1.8/net/http.rb:1988:in `read_status_line'
C:/Ruby/lib/ruby/1.8/net/http.rb:1977:in `read_new'
C:/Ruby/lib/ruby/1.8/net/http.rb:1046:in `request'
C:/Ruby/lib/ruby/1.8/net/http.rb:944:in `request_get'

The appropriate part in protocol.rb is this:

    def rbuf_fill
      timeout(@read_timeout) {
        @rbuf << @io.sysread(1024)
      }
    end

So sysread suddenly considers "1024" to be an invalid number of bytes
to read? After having considered it valid on each of the previous 5000
iterations?

Any clues? Thanks.