|KVM_READ(3)||FreeBSD Library Functions Manual||KVM_READ(3)|
NAMEkvm_read, kvm_write — read or write kernel virtual memory
LIBRARYKernel Data Access Library (libkvm, -lkvm)
SYNOPSIS#include < kvm.h>
kvm_read( kvm_t *kd, unsigned long addr, void *buf, size_t nbytes);
kvm_write( kvm_t *kd, unsigned long addr, const void *buf, size_t nbytes);
DESCRIPTIONThe 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 VALUESUpon success, the number of bytes actually transferred is returned. Otherwise, -1 is returned.
SEE ALSOkvm(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)
|June 4, 1993||FreeBSD|