Current File : //usr/lib/python2.7/site-packages/procfs/sysctl.py
#! /usr/bin/python
# -*- python -*-
# -*- coding: utf-8 -*-
#
# Copyright (C) 2007 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
class sysctl:
def __init__(self):
self.cache = {}
def __getitem__(self, key):
if not self.cache.has_key(key):
value = self.read(key)
if value == None:
return None
self.cache[key] = value
return self.cache[key]
def __setitem__(self, key, value):
oldvalue = self[key]
if oldvalue == None:
raise IOError
elif oldvalue != value:
self.write(key, value)
self.cache[key] = value
def keys(self):
return self.cache.keys()
def read(self, key):
try:
f = file("/proc/sys/%s" % key.replace(".", "/"))
except:
return None
value = f.readline().strip()
f.close()
return value
def write(self, key, value):
try:
f = file("/proc/sys/%s" % key.replace(".", "/"), "w")
except:
return
f.write(value)
f.close()
def refresh(self):
for key in self.cache():
del self.cache[key]
value = self.read(key)
if value != None:
self.cache[key] = value
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