NAME
bio_register,
bio_unregister —
block I/O ioctl tunnelling
interface
SYNOPSIS
#include
<dev/biovar.h>
int
bio_register(struct
device *dev, int
(*bioctl)(struct device *, u_long, caddr_t));
void
bio_unregister(struct
device *dev);
DESCRIPTION
The block I/O ioctl tunnelling interface is used by drivers to register and unregister ioctl handlers to be accessed via the bio(4) device.
bio_register()
is called by the driver represented by dev to register
the bioctl argument as the ioctl handler for
itself.
bio_unregister()
is called to remove the ioctl handler previously registered with
bio_register() for the device represented by
dev.
bio_register()
and bio_unregister() can be called during
autoconf(9) or from
process context. The bioctl callback is called from
process context.
SEE ALSO
HISTORY
The block I/O ioctl tunnelling interface first appeared in OpenBSD 3.2.
AUTHORS
The block I/O ioctl tunnelling interface was written by Niklas Hallqvist <niklas@openbsd.org>.