kvm_read(3)

NAME

kvm_read, kvm_write - read or write kernel virtual memory

LIBRARY

Kernel Data Access Library (libkvm, -lkvm)

SYNOPSIS

#include <kvm.h>
ssize_t
kvm_read(kvm_t *kd, unsigned long addr,  void  *buf,  size_t
nbytes);
ssize_t
kvm_write(kvm_t  *kd,  unsigned  long addr, const void *buf,
size_t nbytes);

DESCRIPTION

The kvm_read() and kvm_write() functions are used to read

and write kernel virtual memory (or a crash dump file). See kvm_open(3)

or
kvm_openfiles(3) for information regarding opening kernel

virtual memory
and crash dumps.

The kvm_read() function transfers nbytes bytes of data from

the kernel
space address addr to buf. Conversely, kvm_write() trans

fers data from
buf to addr. Unlike their SunOS counterparts, these func

tions cannot be
used to read or write process address spaces.

RETURN VALUES

Upon success, the number of bytes actually transferred is

returned. Otherwise, -1 is returned.

SEE ALSO

kvm(3), kvm_close(3), kvm_getargv(3), kvm_getenvv(3),

kvm_geterr(3),
kvm_getprocs(3), kvm_nlist(3), kvm_open(3), kvm_openfiles(3)

BSD June 4, 1993

BSD