S_IXOTH  = 0000001
S_IWOTH  = 0000002
S_IROTH  = 0000004
S_IRWXO  = 0000007
S_IXGRP  = 0000010
S_IWGRP  = 0000020
S_IRGRP  = 0000040
S_IRWXG  = 0000070
S_IEXEC  = 0000100
S_IXUSR  = 0000100
S_IWRITE = 0000200
S_IWUSR  = 0000200
S_IRUSR  = 0000400
S_IREAD  = 0000400
S_IRWXU  = 0000700
S_ISGID  = 0002000
S_ISUID  = 0004000