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Hi, I can't manage to get the major or minor device numbers
with os.stat :

~ $ll /dev/xda7 /dev/xda8
brw-rw---- 1 root disk 13, 7 Nov 30 2000 /dev/xda7
brw-rw---- 1 root disk 13, 8 Nov 30 2000 /dev/xda8

~ $python
Python 2.2.2 (#4, Oct 15 2002, 04:21:2
[GCC 2.95.4 20011002 (Debian prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.stat("/dev/xda7")
(25008, 17383L, 5643L, 1, 0, 6, 0L, 1007270448, 975597764, 100727044
>>> os.stat("/dev/xda8")
(25008, 17384L, 5643L, 1, 0, 6, 0L, 1007270448, 975597764, 100727044
>>> 17384 / 256 , 17384 % 256
(67, 232)


I expected major*256+minor, I've tried a lot of combinations at random
and couldn't manage to get 17383 from (13,7)

Any idea ?

Thanks
Alain

Alain Tesio wrote:

> I expected major*256+minor, I've tried a lot of combinations at random
> and couldn't manage to get 17383 from (13,7)

For the answer to this, you should really be looking at man stat. The
values here are implementation defined; Python's just mimicking whatever
the underlying OS is doing. What you want is st_rdev:

>>> import os
>>> os.system('ls -l /dev/ttyS0')
crw-rw---- 1 root uucp 4, 64 Jul 17 1994 /dev/ttyS0
0
>>> s = os.stat('/dev/ttyS0')
>>> tuple(s)
(8624, 9064L, 769L, 1, 0, 14, 0L, 1058628788, 774488935, 1058628789)
>>> s.st_rdev
1088
>>> divmod(1088, 256)
(4, 64)

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