Hi,
you need to include the new kernel header files when you build. The JNI
has
#include <linux/usbdevice_fs.h>
which is where the #define for USBDEVFS_DISCONNECT is located, it's a
macro so the actual number is something arbitrary. You should just make
sure, during build, that the file is included correctly. The compiler
automatically includes the /usr/include directory, which has a linux/
directory matching whatever kernel was installed with your system. You
need to either update the link by doing:
cd /usr/include
mv linux linux-old
ln -s /usr/src/linux/include/linux
where /usr/src/linux is a link to the 'real' directory, i.e.
cd /usr/src
rm linux
ln -s linux-2.4.23-pre7 linux
or, you can put the directory directly on the compile line (by editing the
Makefile or calling gcc yourself), e.g.
gcc -I/usr/src/linux/include ...whatever...
including linux header files can get complicated though...if you are
really interested in the details, search google or search the linux-kernel
archives. For this simple program either of the above will work.
On Tue, 21 Oct 2003, Aaron Metzger wrote:
>Dan and Aurelien:
>
>Thank you for the info regarding the use of UsbInterfacePolicy to
>allow a "forceClaim".
>
>I have recently upgraded to 2.4.23-pre7 to get a kernel with support
>for the disconnect behavior.
>
>Apparently, a minor native code change in the reference implementation
>is also required to enable support for forceClaim in addition to using
>a recent kernel version.
>
>It appears that "USBDEVFS_DISCONNECT" needs to be defined during the
>native code compilation.
>
>However, a simple #define is not enough.
>
>The code
>
>void disconnect_interface_driver(JNIEnv *env, int fd, int interface)
>{
> struct usbdevfs_ioctl *disc_ioctl = NULL;
>
>
>
> if (!(disc_ioctl = malloc(sizeof(*disc_ioctl)))) {
> log( LOG_CRITICAL, "Out of memory!" );
> return;
> }
>
>
>
> disc_ioctl->ifno = interface;
> disc_ioctl->ioctl_code = USBDEVFS_DISCONNECT;
> disc_ioctl->data = NULL;
>
>actually makes use of the VALUE of the define to initialize the
>ioctl_code.
>
>Is "disc_ioctl->ioctl_code" supposed to be set to 1 here or is some
>other value expected?
>
>Is a direct edit of JavaxUsb.h the intended place to enable the
>disconnect functionality or is there some other configuration or make
>file option that I missed?
>
>Thanks.
>
>
>
>Dan Streetman wrote:
>
>> I think using the UsbInterfacePolicy.forceClaim() is the best way to do
>> things, and the Linux implementation can keep up with changes the Linux
>> kernel makes in how it's done at a low level. Also, it hopefully will be
>> somewhat portable to other OSes...
>>
>>
>> On Sat, 11 Oct 2003, Aurelien Godin wrote:
>>
>>
>>>In a previous archive, Dan Streetman wrote that :
>>>
>>>>>The most interesting change is the UsbInterfacePolicy. An interesting
>>>>>side note to the policy is the 'forceClaim' option, which allows you (on
>>>>>certain Linux kernels, 2.5 and from 2.4.23-pre2) to remove existing USB
>>>>>drivers from any usb interface, so you can drive the interface from
>>>>>userspace.
>>>
>
>
>
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--
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---------------------
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