NAME    [Toc]    [Back]

     kvm_read, kvm_write - read or write kernel virtual memory

SYNOPSIS    [Toc]    [Back]

     #include <kvm.h>

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

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

DESCRIPTION    [Toc]    [Back]

     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() transfers data from
     buf to addr.  Unlike their SunOS counterparts,  these  functions cannot be
     used to read or write process address spaces.

RETURN VALUES    [Toc]    [Back]

     Upon  successful  completion,  the  number of bytes actually
transferred is
     returned.  Otherwise, -1 is returned.

SEE ALSO    [Toc]    [Back]

     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)

OpenBSD      3.6                           June      4,      1993