Re: Asynchronous CDROM Events in Userland

[hugang <gang_hu@soul.com.cn>]

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Now it can work!
On Mon, 4 Feb 2002 08:57:12 +0100
Jens Axboe <axboe@suse.de> wrote:

> On Mon, Feb 04 2002, Erik Andersen wrote:
> > Jens Axboe and I wrote a little test app a year or two ago to check
> > for whether drives supported asynchronous mode.  We found it to be
> > unsupported on 100% of the drives we tested (and we tested quite a
> > few)...
> 
> Yep, _no_ drives to date support queued event notification. However, a
> polled approach is really not too bad -- it simply means that we'll push
> it to user space instead. I've written a small utility for reference.
> 
> -- 
> Jens Axboe
> 
> 


-- 
thanks with regards!
hugang.胡刚.

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--- cd_poll.c~	Mon Feb  4 20:26:25 2002
+++ cd_poll.c	Mon Feb  4 22:03:21 2002
@@ -80,7 +80,7 @@
 		return ret;
 	}
 
-	return buffer[4] & 0xf;
+	return buffer[5] & 0xf;
 }
 
 int poll_events(int fd)