Date: Wed, 22 Dec 1999 21:46:47 +0000 From: Mark Ovens <mark@ukug.uk.freebsd.org> To: "Ronald 'Ko' Klop" <ronald@node11a94.a2000.nl> Cc: freebsd-questions@freebsd.org Subject: Re: Q: using kvm gives a compile error Message-ID: <19991222214646.G322@marder-1> In-Reply-To: <Pine.BSF.4.05.9912222136540.1813-100000@dlanor.evertsen.nl> References: <Pine.BSF.4.05.9912222136540.1813-100000@dlanor.evertsen.nl>
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On Wed, Dec 22, 1999 at 09:41:56PM +0100, Ronald 'Ko' Klop wrote:
> Hello,
>
> I'm trying to write a program using kvm.
> But even the simplest program failes to compile.
>
> Here is my program iftest.cc:
> #include <fcntl.h>
> #include <kvm.h>
> #include <stdlib.h>
> #include <stdio.h>
>
> int main(int argc,char **argv) {
> char *nlistf=NULL,*memf=NULL;
> kvm_t *kvmd;
>
> kvmd = kvm_open(nlistf,memf,NULL,O_RDONLY,"kvm: ");
> if (kvmd==NULL) {
> printf("error opening kvm\n");
> exit(0);
> }
> kvm_close(kvmd);
> return 0;
> }
>
>
> Compiling gives the following output:
> g++ iftest.cc
> /var/tmp/ccOV18281.o: In function `main':
> /var/tmp/ccOV18281.o(.text+0x26): undefined reference to `kvm_open'
> /var/tmp/ccOV18281.o(.text+0x55): undefined reference to `kvm_close'
>
> I have read the man pages searched the mail archive, but didn't find
> anything. I also looked at the implementation of top and netstat.
> But couldn't find a clue about what I am forgetting.
>
> Does somebody know how to do this?
>
You need to link in the kvm library:
marder-1# g++ iftest.cc
/tmp/ccKh11401.o: In function `main':
/tmp/ccKh11401.o(.text+0x26): undefined reference to `kvm_open'
/tmp/ccKh11401.o(.text+0x55): undefined reference to `kvm_close'
marder-1# g++ iftest.cc -lkvm
marder-1# ./a.out
marder-1#
> Greetings,
>
> Ronald.
>
> PS: I'm trying to do this to get the number of send/received bytes across
> the ethernet from the kernel.
>
> --
> Ronald Klop
> http://node11a94.a2000.nl/~ronald/
>
>
>
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--
"there's a long-standing bug relating to the x86 architecture
that allows you to install Windows too"
-Matthew D. Fuller
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