[Xen-devel] why the /dev/mem ioctl ?

[Rik van Riel <riel@xxxxxxxxxx>]

Hi,

While creating a patch file from the latest Xen, I noticed
something strange.  There's an ioctl being added to /dev/mem.

I'm wondering what it's used for and why it's using /dev/mem
instead of (say) /dev/xenctl ...

+static int ioctl_mem(struct inode * inode, struct file * file, unsigned 
int cmd, unsigned long arg)
+{
+       switch (cmd) {
+       case _IO('M', 1): file->private_data = (void *)arg; break;
+       default: return -ENOSYS;
+       }
+       return 0;
+}

+#if defined(CONFIG_XEN_PRIVILEGED_GUEST)
+       .ioctl          = ioctl_mem,
+#endif


-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan



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