wine users - Mar 2010 - CreateFile \\\\.\\x: non-root

Hello, 

I have a usb data aquisition device interfaced by mass storage protocol. I open
it like:

hEcgDrive=CreateFile("\\\\.\\g:",
	GENERIC_READ | GENERIC_WRITE,
	FILE_SHARE_READ | FILE_SHARE_WRITE,
	NULL,
	OPEN_EXISTING,
	FILE_ATTRIBUTE_NORMAL | FILE_FLAG_NO_BUFFERING |
	FILE_FLAG_WRITE_THROUGH | FILE_FLAG_OVERLAPPED,
	NULL);

for communication I use

DeviceIoControl(hEcgDrive,
	IOCTL_SCSI_PASS_THROUGH_DIRECT,
....
with a 'custom' scsi operation code as wrapper.

On Wine-1.1.30. under UHU linux (2.6.23.9-1) the program can open the device
only if run as root. If run as plain user,  CreateFile gives            
ERROR_ACCESS_DENIED (5).

I also tried with FILE_ALL_ACCESS, no luck.

I would appreciate any experience shared to solve this access issue!

The device has a basic filesystem with a txt file, so it is mapped under
dosdevices, ok.

And an other question:
is it possible to open "\\\\.\\PHYSICALDISK2, this way no filesystem is
needed, and the user is not confused with the apperance of a new drive. Under
windows I follow the later strategy with success!

Thank you,
Gyula

Wine is layered on top of normal Linux APIs and thus has all the limitations of
a normal Linux app. If a program requires raw device access to lets say
/dev/sda, the user either needs root permissions or needs to be a member of a
group which has raw device access.

szivibuvi wrote:
> Hello, 
>
> I have a usb data aquisition device interfaced by mass storage protocol. I
open it like:
>
> hEcgDrive=CreateFile("\\\\.\\g:",
> 	GENERIC_READ | GENERIC_WRITE,
> 	FILE_SHARE_READ | FILE_SHARE_WRITE,
> 	NULL,
> 	OPEN_EXISTING,
> 	FILE_ATTRIBUTE_NORMAL | FILE_FLAG_NO_BUFFERING |
> 	FILE_FLAG_WRITE_THROUGH | FILE_FLAG_OVERLAPPED,
> 	NULL);
>
> for communication I use
>
> DeviceIoControl(hEcgDrive,
> 	IOCTL_SCSI_PASS_THROUGH_DIRECT,
> ....
> with a 'custom' scsi operation code as wrapper.
>
> On Wine-1.1.30. under UHU linux (2.6.23.9-1) the program can open the
device only if run as root. If run as plain user,  CreateFile gives            
ERROR_ACCESS_DENIED (5).
>   
This is the clue you need.  You need to change permissions of the device
ioctl (/dev entry) so that your user can access it OR add your user to
the groups with permissions to the device mount point. 

James McKenzie

Thanks, after changing the permissions (chmod 666 /dev/sdb) now the CreateFile
succeeds, but now DeviceIoControl stops with ERROR_NOACCESS (998). For non-root,
ofcourse. For root it still works.
Where should I try to change further permissions?

Thanks,
Gyula

szivibuvi wrote:
> Thanks, after changing the permissions (chmod 666 /dev/sdb) now the
CreateFile succeeds, but now DeviceIoControl stops with ERROR_NOACCESS (998).
For non-root, ofcourse. For root it still works.
> Where should I try to change further permissions?
Try with newer Wine. Also try without these flags: FILE_FLAG_WRITE_THROUGH |
FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING