Messages in this thread | | | From | "Tvrtko A. Uršulin" <> | Subject | Re: Problems in Device Driver Development | Date | Thu, 16 Oct 2003 12:19:23 +0200 |
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> 1. We are not able to use copy_to_user() a chunk of memory from 'write' > function of the device driver. The pointer in the user space is passed to > the kernel space through the 'ioctl' function of the device driver.
I am sure you get some return value from that function wich tells you what the problem is...
> 2. We are not able to send a signal using kill_fasync() from within a > kernel thread, to an user space process. The problem we face when we do > this is that we get an OOPS message. I tried hard to decode this message, > but in vain. So we came to the conclusion that i cannot send a signal from > within the kernel thread using kill_fasync to a process that is running in > the user space. Am i right in my conclusion, if not what should i do to > make it possible. > > 3. Similar to problem numbered 2, we face same problems in doing with > 'tasklets'.
kill_fasync() works just fine if used properly.
Try to find Linux Device Drivers 2nd edition online book, it can explain this basic question to you.
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