mirror of
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59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# pylint: disable=W0702
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import os
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import signal
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import subprocess
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import sys
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import time
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def _IsLinux():
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"""Return True if on Linux; else False."""
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return sys.platform.startswith('linux')
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class Xvfb(object):
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"""Class to start and stop Xvfb if relevant. Nop if not Linux."""
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def __init__(self):
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self._pid = 0
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def Start(self):
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"""Start Xvfb and set an appropriate DISPLAY environment. Linux only.
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Copied from tools/code_coverage/coverage_posix.py
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"""
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if not _IsLinux():
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return
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proc = subprocess.Popen(['Xvfb', ':9', '-screen', '0', '1024x768x24',
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'-ac'],
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stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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self._pid = proc.pid
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if not self._pid:
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raise Exception('Could not start Xvfb')
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os.environ['DISPLAY'] = ':9'
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# Now confirm, giving a chance for it to start if needed.
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for _ in range(10):
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proc = subprocess.Popen('xdpyinfo >/dev/null', shell=True)
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_, retcode = os.waitpid(proc.pid, 0)
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if retcode == 0:
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break
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time.sleep(0.25)
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if retcode != 0:
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raise Exception('Could not confirm Xvfb happiness')
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def Stop(self):
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"""Stop Xvfb if needed. Linux only."""
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if self._pid:
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try:
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os.kill(self._pid, signal.SIGKILL)
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except:
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pass
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del os.environ['DISPLAY']
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self._pid = 0
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