Re: How to notify a user process from within a driver

[Alan Cox]

On Iau, 2003-05-01 at 20:23, Lee, Shuyu wrote:
> Hello, All.
> 
> I am working on a device driver. One of the features of the hardware is
> multi-channel I/O control. In order for a user process to communicate with
> the hardware, my design is for the user process to call the driver's ioctl
> to register a semaphore for each I/O channel, 

For event waiting look at poll/select not at the SYS5 semaphore stuff
which is really an old compat hack for weird stuff AT&T did years ago.