xref: /titanic_51/usr/src/man/man3kvm/kvm_kread.3kvm (revision c10c16dec587a0662068f6e2991c29ed3a9db943) 
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 Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved
 The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
 You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
 When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
 kvm_kread 3KVM "2 May 2002" "SunOS 5.11" "Kernel VM Library Functions"
 NAME
kvm_kread, kvm_kwrite, kvm_uread, kvm_uwrite - copy data to or from a kernel
image or running system

 SYNOPSIS


cc [ flag.\|.\|. ] file.\|.\|. -lkvm [ library.\|.\|.]
#include <kvm.h>

ssize_t kvm_kread(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);






ssize_t kvm_kwrite(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);






ssize_t kvm_uread(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);






ssize_t kvm_uwrite(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);




 DESCRIPTION

The kvm_kread() function transfers data from the kernel address space to
the address space of the process. nbytes bytes of data are copied from
the kernel virtual address given by addr to the buffer pointed to by
buf.


The kvm_kwrite() function is like kvm_kread(), except that the
direction of the transfer is reversed. To use this function, the
kvm_open(3KVM) call that returned kd must have specified write
access.


The kvm_uread() function transfers data from the address space of the
processes specified in the most recent kvm_getu(3KVM) call. nbytes
bytes of data are copied from the user virtual address given by addr to
the buffer pointed to by buf.


The kvm_uwrite() function is like kvm_uread(), except that the
direction of the transfer is reversed. To use this function, the
kvm_open(3KVM) call that returned kd must have specified write
access. The address is resolved in the address space of the process specified
in the most recent kvm_getu(3KVM) call.

 RETURN VALUES

On success, these functions return the number of bytes actually transferred. On
failure, they return -1.

 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:







ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStable
MT-LevelUnsafe



 SEE ALSO

kvm_getu(3KVM), kvm_nlist(3KVM), kvm_open(3KVM),
attributes(5)