Creating notification groups

To create a notification group:
  1. Open the .notify object in the root of the PPS filesystem.
  2. Read the .notify object; the first read of this file returns a short string (less than 16 characters) with the name of the group to which other file descriptors should associate themselves.

To associate a file descriptor to a group, on an open, specify the pathname open option ?notify=group:value, where:

Note: The returned notification group string has a trailing linefeed character that you must remove before using the string.