class Toys::Utils::Exec::Executor

def initialize(exec_opts, spawn_cmd, block)
  @fork_func = spawn_cmd.respond_to?(:call) ? spawn_cmd : nil
  @spawn_cmd = spawn_cmd.respond_to?(:call) ? nil : spawn_cmd
  @config_opts = exec_opts.config_opts
  @spawn_opts = exec_opts.spawn_opts
  @captures = {}
  @controller_streams = {}
  @join_threads = []
  @child_streams = []
  @parent_streams = []
  @block = block
  @default_stream = @config_opts[:background] ? :null : :inherit
end