# Copyright (C) 2006, Red Hat, Inc. # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. import os import socket import sys import gobject from sugar import env def get_display_number(): """Find a free display number trying to connect to 6000+ ports""" retries = 20 display_number = 1 display_is_free = False while not display_is_free and retries > 0: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: s.connect(('127.0.0.1', 6000 + display_number)) s.close() display_number += 1 retries -= 1 except: display_is_free = True if display_is_free: return display_number else: logging.error('Cannot find a free display.') sys.exit(0) class Process: """Object representing one of the session processes""" def __init__(self, command): self._command = command def get_name(self): return self._command def start(self, standard_output=False): args = self._command.split() flags = gobject.SPAWN_SEARCH_PATH result = gobject.spawn_async(args, flags=flags, standard_output=standard_output) self._stdout = result[2] class MatchboxProcess(Process): def __init__(self): kbd_config = os.path.join(env.get_data_dir(), 'kbdconfig') options = '-kbdconfig %s ' % kbd_config options += '-use_titlebar no ' options += '-theme olpc ' command = 'matchbox-window-manager %s ' % options Process.__init__(self, command) def get_name(self): return 'Matchbox' class XephyrProcess(Process): def __init__(self): self._display = get_display_number() cmd = 'Xephyr :%d -ac -screen 800x600' % (self._display) Process.__init__(self, cmd) def get_name(self): return 'Xephyr' def start(self): Process.start(self) os.environ['DISPLAY'] = ":%d" % (self._display) class XnestProcess(Process): def __init__(self): self._display = get_display_number() cmd = 'Xnest :%d -ac -geometry 800x600' % (self._display) Process.__init__(self, cmd) def get_name(self): return 'Xnest' def start(self): Process.start(self) os.environ['DISPLAY'] = ":%d" % (self._display) class Emulator: """The OLPC emulator""" def start(self): try: process = XephyrProcess() process.start() except: try: process = XnestProcess() process.start() except: print 'Cannot run the emulator. You need to install \ Xephyr or Xnest.' sys.exit(0) process = MatchboxProcess() process.start()