tests/d_type-check

   1 #!/usr/bin/python
   2 # Exit 0 if "." has useful d_type information, else 1.
   3 # Intended to exit 0 only on Linux/GNU systems.
   4 import sys
   5
   6 fail = 1
   7 try:
   8   import ctypes
   9
  10   (DT_UNKNOWN, DT_DIR,) = (0, 4,)
  11
  12   class dirent(ctypes.Structure):
  13     _fields_ = [
  14       ("d_ino", ctypes.c_long),
  15       ("d_off", ctypes.c_long),
  16       ("d_reclen", ctypes.c_ushort),
  17       ("d_type", ctypes.c_ubyte),
  18       ("d_name", ctypes.c_char*256)]
  19
  20   direntp = ctypes.POINTER(dirent)
  21
  22   # FIXME: find a way to avoid hard-coding libc's so-name.
  23   libc = ctypes.cdll.LoadLibrary("libc.so.6")
  24   libc.readdir.restype = direntp
  25
  26   dirp = libc.opendir(".")
  27   if dirp:
  28     ep = libc.readdir(dirp)
  29     if ep:
  30       name = ep.contents.d_name
  31       if (name == "." or name == "..") and ep.contents.d_type == DT_DIR:
  32         fail = 0
  33
  34 except:
  35   pass
  36
  37 sys.exit(fail)