How to detach a spawned child process in a Node.js script?

by

From node.js documentation:

By default, the parent will wait for the detached child to exit. To prevent the parent from waiting for a given child, use the child.unref() method, and the parent’s event loop will not include the child in its reference count.

When using the detached option to start a long-running process, the process will not stay running in the background unless it is provided with a stdio configuration that is not connected to the parent. If the parent’s stdio is inherited, the child will remain attached to the controlling terminal.

You need to modify your code something like this:

#!/usr/bin/node
var fs = require('fs');
var out = fs.openSync('./out.log', 'a');
var err = fs.openSync('./out.log', 'a');

var cp = require('child_process');
var MANFILE='ALengthyNodeManual.pdf';
var child = cp.spawn('gnome-open', [MANFILE], { detached: true, stdio: [ 'ignore', out, err ] });
child.unref();

More Related Contents:

  1. Get the client’s IP address in socket.io
  2. npm install errors with Error: ENOENT, chmod
  3. Render a variable as HTML in EJS
  4. How to cache the RUN npm install instruction when docker build a Dockerfile
  5. Client certificate validation on server side, DEPTH_ZERO_SELF_SIGNED_CERT error
  6. Try reinstalling `node-sass` on node 0.12?
  7. npm failed to install time with make not found error
  8. bower command not found
  9. Get version number from package.json in React Redux (create-react-app)
  10. How do I override nested dependencies with `yarn`?
  11. The authenticity of host ‘github.com (192.30.252.128)’ can’t be established
  12. “Please try running this command again as Root/Administrator” error when trying to install LESS
  13. How to “Ping” from a Node.js app?
  14. Obtaining the hash of a file using the stream capabilities of crypto module (ie: without hash.update and hash.digest)
  15. Reading content from URL with Node.js
  16. Displaying an image with EJS in node.js/express
  17. How to use socket.io in express routes?
  18. how to create a readable stream from a remote url in nodejs?
  19. Mongoose overwrite the document rather that `$set` fields
  20. How to get SCSS variables into react
  21. Firebase realtime database transaction handler gets called twice most of the time
  22. Read file from aws s3 bucket using node fs
  23. Express Router undefined params with router.use when split across files
  24. Connect or Express middleware to modify the response.body [closed]
  25. nodejs connect error: “has no method ‘static'”
  26. CORS-enabled server not denying requests
  27. How do I uninstall nodejs installed from pkg (Mac OS X)?
  28. Using multiple parameters in URL in express
  29. How to access Google Chrome’s IndexedDB/LevelDB files?
  30. Create unique autoincrement field with mongoose [duplicate]

Leave a Comment