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# Copyright 2011 Canonical Ltd.
#
# This file is part of u1db.
#
# u1db is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# u1db 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 u1db. If not, see <http://www.gnu.org/licenses/>.
import errno
import time
def safe_close(process, timeout=0.1):
"""Shutdown the process in the nicest fashion you can manage.
:param process: A subprocess.Popen object.
:param timeout: We'll try to send 'SIGTERM' but if the process is alive
longer that 'timeout', we'll send SIGKILL.
"""
if process.poll() is not None:
return
try:
process.terminate()
except OSError, e:
if e.errno in (errno.ESRCH,):
# Process has exited
return
tend = time.time() + timeout
while time.time() < tend:
if process.poll() is not None:
return
time.sleep(0.01)
try:
process.kill()
except OSError, e:
if e.errno in (errno.ESRCH,):
# Process has exited
return
process.wait()
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