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# Copyright 2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from portage import os
from portage.util._ctypes import find_library, LoadLibrary
from portage.util._async.ForkProcess import ForkProcess
class SyncfsProcess(ForkProcess):
"""
Isolate ctypes usage in a subprocess, in order to avoid
potential problems with stale cached libraries as
described in bug #448858, comment #14 (also see
http://bugs.python.org/issue14597).
"""
__slots__ = ('paths',)
@staticmethod
def _get_syncfs():
filename = find_library("c")
if filename is not None:
library = LoadLibrary(filename)
if library is not None:
try:
return library.syncfs
except AttributeError:
pass
return None
def _run(self):
syncfs_failed = False
syncfs = self._get_syncfs()
if syncfs is not None:
for path in self.paths:
try:
fd = os.open(path, os.O_RDONLY)
except OSError:
pass
else:
try:
if syncfs(fd) != 0:
# Happens with PyPy (bug #446610)
syncfs_failed = True
finally:
os.close(fd)
if syncfs is None or syncfs_failed:
return 1
return os.EX_OK
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