Creating notification groups

To create a notification group:

Open the .notify object in the root of the PPS filesystem.
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 with a group, on an open, specify the pathname open option ?notify=group:value, where:

group is the string returned by the first read from the .notify file
value is any arbitrary string; a subscriber will use this string to determine which objects bound to the notification group have data available for reading

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