21 def S_IMODE(mode):  argument
22     return mode & 07777
24 def S_IFMT(mode):  argument
25     return mode & 0170000
40 def S_ISDIR(mode):  argument
41     return S_IFMT(mode) == S_IFDIR
43 def S_ISCHR(mode):  argument
44     return S_IFMT(mode) == S_IFCHR
46 def S_ISBLK(mode):  argument
47     return S_IFMT(mode) == S_IFBLK
49 def S_ISREG(mode):  argument
50     return S_IFMT(mode) == S_IFREG
52 def S_ISFIFO(mode):  argument
53     return S_IFMT(mode) == S_IFIFO
55 def S_ISLNK(mode):  argument
56     return S_IFMT(mode) == S_IFLNK
58 def S_ISSOCK(mode):  argument
59     return S_IFMT(mode) == S_IFSOCK