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76 lines
1.6 KiB
Python
76 lines
1.6 KiB
Python
import logging
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import os
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import socket
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import sys
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from Process import Process
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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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logging.info('Display %d is already in use. Trying next.' % (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 640x480' % (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 640x480' % (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 __init__(self):
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pass
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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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logging.error('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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