Method: DTAS::Pipeline#pspawn

Defined in:
lib/dtas/pipeline.rb

#pspawn(env, cmd, rdr = {}) ⇒ Object

Process.spawn wrapper which supports running Proc-like objects in a separate process, not just external commands. Returns the pid of the spawned process



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# File 'lib/dtas/pipeline.rb', line 13

def pspawn(env, cmd, rdr = {})
  case cmd
  when Array
    spawn(env, *cmd, rdr)
  else # support running Proc-like objects, too:
    fork do
      ENV.update(env) if env

      # setup redirects
      [ $stdin, $stdout, $stderr ].each_with_index do |io, fd|
        dst = rdr[fd] and io.reopen(dst)
      end

      # close all other pipes, since we can't rely on FD_CLOEXEC
      # (as we do not exec, here)
      rdr.each do |k, v|
        k.close if v == :close
      end
      cmd.call
    end
  end
end