1.\" $NetBSD: kcopy.9,v 1.7 2017/04/06 15:57:23 dholland Exp $ 2.\" 3.\" Copyright (c) 2002 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Gregory McGarry. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd April 6, 2017 31.Dt KCOPY 9 32.Os 33.Sh NAME 34.Nm kcopy 35.Nd copy data with abort on page fault 36.Sh SYNOPSIS 37.In sys/systm.h 38.Ft int 39.Fn kcopy "const void *src" "void *dst" "size_t len" 40.Sh DESCRIPTION 41.Fn kcopy 42copies 43.Fa len 44bytes from 45.Fa src 46to 47.Fa dst , 48aborting if a fatal page fault is encountered. 49.Pp 50.Fn kcopy 51must save and restore the old fault handler since it is called by 52.Xr uiomove 9 , 53which may be in the path of servicing a non-fatal page fault. 54.Sh RETURN VALUES 55.Fn kcopy 56returns 0 on success and an error number on failure. 57.Sh SEE ALSO 58.Xr errno 2 , 59.Xr memcpy 9 , 60.Xr uiomove 9 61