RE : Error while opennig device file

I'm sorry but this is a "copy to mail" error. =20
Here is the right code:

ret_val =3D system("mknod -m 777 /dev/test1 c 122 1");
ret_val =3D system("mknod -m 777 /dev/test2 c 122 2");

file_desc1 =3D open("/dev/test1", O_RDWR);
file_desc2 =3D open("/dev/test2", O_RDWR);

Sorry again but I would have liked that it was so easy...lol

-------- Message d'origine--------
De: Eugene Surovegin [mailto:ebs@ebshome.net]
Date: mer. 15/06/2005 19:26
=C0: Garcia J=E9r=E9mie
Cc: linuxppc-dev@ozlabs.org
Objet : Re: Error while opennig device file
=20
On Wed, Jun 15, 2005 at 06:19:43PM +0200, Garcia J?r?mie wrote:

Hi everybody,
I'd like to have your opinion on such a stupid question. Indeed, it =

must be very easy to see but

I can't find out what goes on.
I'm writing a device driver. In the init_module(), I register it with =

TEST_DEV_MAJOR =3D 122=20

=20
ret_val =3D register_chrdev(TEST_DEV_MAJOR, TEST_DEV_PROC_NAME, =

&lcd_fops);

=20
In the user space, I have a programm that creates two device files =

using the same major number but with=20

different minor numbers:
=20
ret_val =3D system("mknod -m 777 /dev/Test1 c 122 1");
ret_val =3D system("mknod -m 777 /dev/Test1 c 122 2");

                                          ^=20

Then I try to open both files :
file_desc1 =3D open("/dev/test1", O_RDWR);
file_desc2 =3D open("/dev/test2", O_RDWR);

You must be kidding.

You create /dev/Test1 twice, and then open /dev/test1 and /dev/test2.

First of all, Linux fs are case sensitive, second, you don't create=20
test2 (even with wrong case).

--=20
Eugene

On Wed, Jun 15, 2005 at 07:47:56PM +0200, Garcia J?r?mie wrote:

I'm sorry but this is a "copy to mail" error.  
Here is the right code:

ret_val = system("mknod -m 777 /dev/test1 c 122 1");
ret_val = system("mknod -m 777 /dev/test2 c 122 2");

file_desc1 = open("/dev/test1", O_RDWR);
file_desc2 = open("/dev/test2", O_RDWR);

Sorry again but I would have liked that it was so easy...lol

OK, how does open routine for your device look like?
What error do you get on second open?

-- 
Eugene

Also - does it work from the command line?  Do both mknod commands work? 
When you "ls -l /dev/test{1,2}" , what do you get?  What happens when you 
"cat /dev/test1" or "echo > /dev/test1" ?

Cheers,
dstn.

quoted

I'm sorry but this is a "copy to mail" error.
Here is the right code:

ret_val = system("mknod -m 777 /dev/test1 c 122 1");
ret_val = system("mknod -m 777 /dev/test2 c 122 2");

file_desc1 = open("/dev/test1", O_RDWR);
file_desc2 = open("/dev/test2", O_RDWR);