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#!/usr/bin/python
# Exit 0 if "." has useful d_type information, else 1.
# Intended to exit 0 only on Linux/GNU systems.
import sys
fail = 1
try:
import ctypes
(DT_UNKNOWN, DT_DIR,) = (0, 4,)
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)]
direntp = ctypes.POINTER(dirent)
# FIXME: find a way to avoid hard-coding libc's so-name.
libc = ctypes.cdll.LoadLibrary("libc.so.6")
libc.readdir.restype = direntp
dirp = libc.opendir(".")
if dirp:
ep = libc.readdir(dirp)
if ep:
name = ep.contents.d_name
if (name == "." or name == "..") and ep.contents.d_type == DT_DIR:
fail = 0
except:
pass
sys.exit(fail)
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