kvm_read

KVM_READ(3)               OpenBSD Programmer's Manual              KVM_READ(3)

NAME

     kvm_read, kvm_write - read or write kernel virtual memory

SYNOPSIS

     #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

     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) 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

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

SEE ALSO

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

OpenBSD 5.1                     August 18, 2011                    OpenBSD 5.1