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Subject: [Bug 218625] [PATCH] Evdev ioctls EVIOCGRAB and EVIOCREVOKE don't
 work together with cuse
Date: Mon, 17 Apr 2017 13:06:13 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218625

--- Comment #4 from Vladimir Kondratyev <vladimir@kondratyev.su> ---
(In reply to Jan Kokem=C3=BCller from comment #3)
> I don't know if this is cuse specific behavior,
> or if FreeBSD in general behaves like this.

IOWINT ioctl passes int value in internal buffer and provide pointer to that
buffer to handler exactly like IOW(NNN, ###, int)

Following is IOWINT->IO convertor from webcamd internals, AFAIR, it is work=
ing:

        /*
         * Copy in the _IOWINT parameter and pass it as arg pointer
         * similar to what Linux is doing:
         */
        if ((cmd & IOC_DIRMASK) =3D=3D IOC_VOID && IOCPARM_LEN(cmd) =3D=3D =
sizeof(int))
{
                if (copy_from_user(&iowint, arg, sizeof(iowint)) !=3D 0) {
                        retval =3D -EFAULT;
                        goto done;
                }
                arg =3D (void *)(intptr_t)iowint;
        }

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