#!/usr/bin/python
#
# Copyright (c) 2008 Red Hat, Inc.
# Author: Adam Jackson <ajax@redhat.com>
# License: http://www.opensource.org/licenses/mit-license.php
#
# Try to get the list of X display connections.
#
# This tries harder than xlsclients, which only looks for windows with
# the WM_COMMAND property set.  The algorithm is fundamentally unreliable
# though.  Essentially we're looking through the list of sockets by inode
# number, and assuming that the client inode is immediately less than
# the server inode in numeric sort order.  It's guaranteed to be strictly
# less than (the connect() call happens before the accept() call), if you
# ignore uint64_t wraparound, but some other process could have created a
# socket between those two.
#
# If you're not running on Linux, this probably doesn't work at all.

from subprocess import Popen, PIPE

client_sockets = []
match = 0

ns = Popen(["netstat", "-an", "--unix"], stdout=PIPE)
output = ns.communicate()[0]
for line in output.split('\n'):
    if line.find("X11-unix") != -1:
	match = 1
    elif match:
	match = 0
	inode = line.split()[6]
	client_sockets.append(inode)

lsof = Popen(["lsof", "-U", "+c0", "-w"], stdout=PIPE)
output = lsof.communicate()[0]
for line in output.split('\n'):
    try:
	inode = line.split()[7]
	if inode in client_sockets:
	    print line
    except:
	pass