On Fri, 14 Dec 2007, Phil Endecott wrote: > OK, but the kernel driver can still look in the buffer even though it > doesn't know how much, if any, of it is actually valid; it might do > this as a "last chance" when talking to a broken device, e.g. my > printer. Right?
Yes, the kernel could copy the entire buffer back to userspace regardless of the amount of data transferred. This would exert a certain toll in operating speed, because the kernel would have to clear the contents of the buffer beforehand to avoid a security leak. And the user program still wouldn't know how much of the data in the buffer had actually been transferred from the device. Alan Stern - To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
