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+.\"	$OpenBSD: kvm_read.3,v 1.10 2025/06/06 21:53:13 schwarze Exp $
+.\"	$NetBSD: kvm_read.3,v 1.2 1996/03/18 22:34:01 thorpej Exp $
+.\"
+.\" Copyright (c) 1992, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software developed by the Computer Systems
+.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
+.\" BG 91-66 and contributed to Berkeley.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)kvm_read.3	8.1 (Berkeley) 6/4/93
+.\"
+.Dd $Mdocdate: June 6 2025 $
+.Dt KVM_READ 3
+.Os
+.Sh NAME
+.Nm kvm_read ,
+.Nm kvm_write
+.Nd read or write kernel virtual memory
+.Sh SYNOPSIS
+.Lb libkvm
+.In kvm.h
+.Ft ssize_t
+.Fn kvm_read "kvm_t *kd" "u_long addr" "void *buf" "size_t nbytes"
+.Ft ssize_t
+.Fn kvm_write "kvm_t *kd" "u_long addr" "const void *buf" "size_t nbytes"
+.Sh DESCRIPTION
+The
+.Fn kvm_read
+and
+.Fn kvm_write
+functions are used to read and write kernel virtual memory (or a crash
+dump file).
+See
+.Xr kvm_open 3
+for information regarding opening kernel virtual memory and crash dumps.
+.Pp
+The
+.Fn kvm_read
+function transfers
+.Fa nbytes
+bytes of data from
+the kernel space address
+.Fa addr
+to
+.Fa buf .
+Conversely,
+.Fn kvm_write
+transfers data from
+.Fa buf
+to
+.Fa addr .
+Unlike their SunOS counterparts, these functions cannot be used to
+read or write process address spaces.
+.Sh RETURN VALUES
+Upon successful completion, the number of bytes actually transferred is
+returned.
+Otherwise, \-1 is returned.
+.Sh SEE ALSO
+.Xr kvm 3 ,
+.Xr kvm_geterr 3 ,
+.Xr kvm_getprocs 3 ,
+.Xr kvm_nlist 3 ,
+.Xr kvm_open 3