man/man3kvm/kvm_read.3kvm

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 KVM_READ 3KVM "May 2, 2002"
 NAME
kvm_read, kvm_write - copy data to or from a kernel image or running system
 SYNOPSIS

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

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


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


 DESCRIPTION

The kvm_read() function transfers data from the kernel image specified by
kd (see kvm_open(3KVM)) 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_write() function is like kvm_read(), except that the
direction of data transfer is reversed. To use this function, the
kvm_open(3KVM) call that returned kd must have specified write
access. If a user virtual address is given, it is resolved in the address space
of the process specified in the most recent kvm_getu(3KVM) call.
 USAGE

The kvm_read() and kvm_write() functions are obsolete and might be
removed in a future release. The functions described on the
kvm_kread(3KVM) manual page should be used instead.
 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 TYPE ATTRIBUTE VALUE
Interface Stability Obsolete
MT-Level Unsafe


 SEE ALSO

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