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| KVM_READ(3) | FreeBSD Library Functions Manual | KVM_READ(3) |
NAME
kvm_read, kvm_read2,
kvm_write —
LIBRARY
Kernel Data Access Library (libkvm, -lkvm)SYNOPSIS
#include <kvm.h>
ssize_t
kvm_read(kvm_t
*kd, unsigned long
addr, void *buf,
size_t nbytes);
ssize_t
kvm_read2(kvm_t
*kd, kvaddr_t addr,
void *buf,
size_t nbytes);
ssize_t
kvm_write(kvm_t
*kd, unsigned long
addr, const void
*buf, size_t
nbytes);
DESCRIPTION
Thekvm_read(), kvm_read2(), 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() and
kvm_read2() functions transfer
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.
The kvm_read2() function uses a different
type (kvaddr_t) for the addr
argument to allow use of addresses larger than
ULONG_MAX when examining non-native kernel
images.
RETURN VALUES
Upon success, the number of bytes actually transferred is returned. Otherwise, -1 is returned.SEE ALSO
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)| November 27, 2015 | FreeBSD 13.1-RELEASE |
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