kvm_read(3) - NetBSD Manual Pages

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KVM_READ(3)             NetBSD Library Functions Manual            KVM_READ(3)

kvm_read, kvm_write -- read or write kernel virtual memory
Kernel Data Access Library (libkvm, -lkvm)
#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 ker- nel 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. Oth- erwise, -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) NetBSD 7.0 June 4, 1993 NetBSD 7.0
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