Subject: Re: a mmap'able audio device??
To: None <firstname.lastname@example.org.AU, email@example.com>
From: Charles M. Hannum <mycroft@NetBSD.ORG>
Date: 03/04/1996 23:59:25
You're mostly correct, but there are a couple of things to note:
1) Under Linux, getting the `head' pointer requires an ioctl. This is
both good and bad; it's good in that it doesn't mess with the size of
the buffer or require wasting a page due to alignment, but it's bad in
that it's more overhead.
2) There is no `tail' pointer in the Linux version. From my reading
of the code, it will just wrap around and play the buffer again if the
process is too slow.