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Full Discussion: Copy on Write page faults
Operating Systems HP-UX Copy on Write page faults Post 19067 by Perderabo on Friday 5th of April 2002 11:22:07 AM
Old 04-05-2002
There is no point in calling nlist if you are going to ignore the address it returns. If nlist isn't working, you need to fix the problem. There is a bit of a standard among system programmers: if you are going to read a kernel strucre called "cnt", you should call the structure in which you store it "cnt".
Code:
#include <sys/param.h>
#include <sys/unistd.h>
#include <nlist.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/vmmeter.h>
main()
  {
        int fp;
        static struct nlist nl[2] = { {"cnt"},  {NULL} };
        struct vmmeter cnt;
        int off;
        fp=open("/dev/kmem", O_RDONLY);
        nlist("/stand/vmunix",&nl);
        off=nl[0].n_value;
        lseek(fp,off,SEEK_SET);
        read(fp,cnt,sizeof(struct vmmeter));
        printf("%ld\n",cnt.v_free);

}

 

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kvm_nlist(3KVM) 					    Kernel VM Library Functions 					   kvm_nlist(3KVM)

NAME
kvm_nlist - get entries from kernel symbol table SYNOPSIS
cc [ flag... ] file... -lkvm [ library...] #include <kvm.h> #include <nlist.h> int kvm_nlist(kvm_t *kd, struct nlist *nl); DESCRIPTION
The kvm_nlist() function examines the symbol table from the kernel image identified by kd (see kvm_open(3KVM)) and selectively extracts a list of values and puts them in the array of nlist structures pointed to by nl. The name list pointed to by nl consists of an array of structures containing names, types and values. The n_name field of each such structure is taken to be a pointer to a character string rep- resenting a symbol name. The list is terminated by an entry with a null pointer (or a pointer to a null string) in the n_name field. For each entry in nl, if the named symbol is present in the kernel symbol table, its value and type are placed in the n_value and n_type fields. If a symbol cannot be located, the corresponding n_type field of nl is set to 0. RETURN VALUES
The kvm_nlist() functions returns the value of nlist(3UCB) or nlist(3ELF), depending on the library used. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
kvm_open(3KVM), kvm_kread(3KVM), nlist(3ELF), nlist(3UCB), attributes(5) NOTES
Although the libkvm API is Stable, the symbol names and data values that can be accessed through this set of interfaces are Private and are subject to ongoing change. SunOS 5.10 2 May 2002 kvm_nlist(3KVM)
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