88 lines
2.2 KiB
Python
88 lines
2.2 KiB
Python
# Copyright (C) 2006, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import os
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import socket
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import sys
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from sugar.session.Process import Process
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import sugar.env
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def get_display_number():
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"""Find a free display number trying to connect to 6000+ ports"""
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retries = 20
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display_number = 1
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display_is_free = False
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while not display_is_free and retries > 0:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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s.connect(('127.0.0.1', 6000 + display_number))
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s.close()
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display_number += 1
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retries -= 1
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except:
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display_is_free = True
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if display_is_free:
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return display_number
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else:
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logging.error('Cannot find a free display.')
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sys.exit(0)
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class XephyrProcess(Process):
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def __init__(self):
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self._display = get_display_number()
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cmd = 'Xephyr :%d -ac -screen 800x600' % (self._display)
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Process.__init__(self, cmd)
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def get_name(self):
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return 'Xephyr'
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def start(self):
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Process.start(self)
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os.environ['DISPLAY'] = ":%d" % (self._display)
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class XnestProcess(Process):
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def __init__(self):
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self._display = get_display_number()
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cmd = 'Xnest :%d -ac -geometry 800x600' % (self._display)
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Process.__init__(self, cmd)
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def get_name(self):
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return 'Xnest'
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def start(self):
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Process.start(self)
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os.environ['DISPLAY'] = ":%d" % (self._display)
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class Emulator:
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"""The OLPC emulator"""
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def start(self):
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try:
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process = XephyrProcess()
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process.start()
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except:
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try:
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process = XnestProcess()
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process.start()
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except:
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print 'Cannot run the emulator. You need to install \
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Xephyr or Xnest.'
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sys.exit(0)
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