read (Net::SSH::Authentication::Pageant::Socket)

         # File lib/net/ssh/authentication/pageant.rb, line 168
    168:       def read(n = nil)
    169:         return nil unless @res
    170:         if n.nil?
    171:           start, @pos = @pos, @res.size
    172:           return @res[start..-1]
    173:         else
    174:           start, @pos = @pos, @pos + n
    175:           return @res[start, n]
    176:         end
    177:       end