title: Android Error in opening framebuffer device
body: <p>In Android, I am trying to open framebuffer device, using NDK code, as below:</p>
  
  <p>fd = open("/dev/graphics/fb0", O_RDONLY)</p>
  
  <p>I am getting the fd result value as -1. My device is rooted and I have declared "android.permission.READ_FRAME_BUFFER" permission in AndroidManifest.xml file.</p>
  
  <p>Is there any additional steps, I should do?</p>