1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# 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
from sugar.session.Process import Process
import sugar.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 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)
|
