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.
Upon success, the number of bytes actually transferred is returned. Otherwise, -1 is returned.
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)