Function sendHelper

lib/internal/cluster/utils.js:16–29

(proc, message, handle, cb)

let seq = 0;

function sendHelper(proc, message, handle, cb) {
  if (!proc.connected)
    return false;

  // Mark message as internal. See INTERNAL_PREFIX
  // in lib/internal/child_process.js
  message = { cmd: 'NODE_CLUSTER', ...message, seq };

  if (typeof cb === 'function')
    callbacks.set(seq, cb);

  seq += 1;
  return proc.send(message, handle);
}

// Returns an internalMessage listener that hands off normal messages
// to the callback but intercepts and redirects ACK messages.