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KVM_READ(3) Library Functions Manual KVM_READ(3)

kvm_read, kvm_write
read or write kernel virtual memory

#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);

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.

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

kvm(3), kvm_geterr(3), kvm_getprocs(3), kvm_nlist(3), kvm_open(3)
June 5, 2013 OpenBSD-current