kvm_nlist3
Retrieve symbol table names from a kernel image
Usage
#include <kvm.h>
#include <nlist.h>
int
kvm_nlist(kvm_t *kd, struct nlist *nl);
int
kvm_nlist2(kvm_t *kd, struct kvm_nlist *nl);
Library
Kernel Data Access Library (libkvm, -lkvm)
Overview
The kvm_nlist() function retrieves the symbol table entries indicated by the name list argument nl. This argument points to an array of nlist structures, terminated by an entry whose n_name field is NULL (see nlist(3)). Each symbol is looked up using the n_name field, and if found, the corresponding n_type and n_value fields are filled in. These fields are set to 0 if the symbol is not found.
The kldsym(2) system call is used to locate symbols in live kernels. This is a less than perfect emulation of the nlist values but has the advantage of being aware of kernel modules and is reasonably fast.
The kvm_nlist2() function retrieves the symbol table entries indicated by the name list argument nl. This argument points to an array of struct kvm_nlist structures, terminated by an entry whose n_name field is NULL These structures are similar to the nlist structures used by kvm_nlist() except that the n_value field uses a different type (kvaddr_t) to avoid truncation when examining non-native kernel images.
Return values
The kvm_nlist() and kvm_nlist2() functions return the number of invalid entries found. If the kernel symbol table was unreadable, -1 is returned.
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 41 times.