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# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Support for Linux namespaces"""
import ctypes
import ctypes.util
import os
CLONE_FS = 0x00000200
CLONE_FILES = 0x00000400
CLONE_NEWNS = 0x00020000
CLONE_NEWUTS = 0x04000000
CLONE_NEWIPC = 0x08000000
CLONE_NEWUSER = 0x10000000
CLONE_NEWPID = 0x20000000
CLONE_NEWNET = 0x40000000
def Unshare(flags):
"""Binding to the Linux unshare system call. See unshare(2) for details.
Args:
flags: Namespaces to unshare; bitwise OR of CLONE_* flags.
Raises:
OSError: if unshare failed.
"""
libc = ctypes.CDLL(ctypes.util.find_library("c"), use_errno=True)
if libc.unshare(ctypes.c_int(flags)) != 0:
e = ctypes.get_errno()
raise OSError(e, os.strerror(e))
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