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

bio(4), autoconf(9)

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>.