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#!/usr/bin/python
# Exit 0 if "." and "./tempfile" have useful d_type information, else 1.
# Intended to exit 0 only on Linux/GNU systems.
import os
import sys
import tempfile
fail = 1
fname = None
try:
import ctypes.util
(DT_UNKNOWN, DT_DIR, DT_REG) = (0, 4, 8)
class dirent(ctypes.Structure):
_fields_ = [
("d_ino", ctypes.c_long),
("d_off", ctypes.c_long),
("d_reclen", ctypes.c_ushort),
("d_type", ctypes.c_ubyte),
("d_name", ctypes.c_char*256)]
# Pass NULL to dlopen, assuming the python
# interpreter is linked with the C runtime
libc = ctypes.CDLL(None)
# Setup correct types for all args and returns
# even if only passing, to avoid truncation etc.
dirp = ctypes.c_void_p
direntp = ctypes.POINTER(dirent)
libc.readdir.argtypes = [dirp]
libc.readdir.restype = direntp
libc.opendir.restype = dirp
# Ensure a file is present
f, fname = tempfile.mkstemp(dir='.')
fname = os.path.basename(fname)
dirp = libc.opendir(".")
if dirp:
while True:
ep = libc.readdir(dirp)
if not ep: break
d_type = ep.contents.d_type
name = ep.contents.d_name
if name == "." or name == "..":
if d_type != DT_DIR: break
# Check files too since on XFS, only dirs have DT_DIR
# while everything else has DT_UNKNOWN
elif name == fname:
if d_type == DT_REG:
fail = 0
break
elif d_type != DT_DIR and d_type != DT_UNKNOWN:
fail = 0
break
except:
pass
try:
if fname:
os.unlink(fname);
except:
pass
sys.exit(fail)
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