Re: Libgtop and FreeBSD

[Martin Baulig <martin home-of-linux org>]

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On Tue, 7 Jul 1998, Josh Sled wrote:

> To: martin@home-of-linux.org
> Subject: Libgtop and FreeBSD
> From: Josh Sled <jsled@scam.XCF.Berkeley.EDU>
> 
> 
> Sorry for the lack of word/progress on the FreeBSD port of Libgtop... 
> I still have intentions to finish what I've started, unfortunately,
> my computer seems to be conspiring against me.
> 
> Every time I try to run test programs [to make sure I'm getting the
> data, and getting the correct data], something goes wrong.  Linking
> with the KVM library [used for getting access to the kvm_* functions
> which report on Kernel Virtual Memory] causes the program to do mysterious,
> bad things... sometimes the output code is screwed up and doesn't see the
> correct main function...  Last time I tried, the program had a bus error
> on the first kvm_ call [kvm_getprocs(...)], which strangely [and
> frustratingly] enough had worked before...  [this is still the case...
> see below]

I have now installed FreeBSD 2.2.6 on my system and a working cross
compiler from Linux to FreeBSD. The following test program worked fine
both with the cross and the native compiler:

===================
#include <stdio.h>
#include <stdlib.h>

#include <sys/types.h>
#include <fcntl.h>

#include <sys/sysctl.h>
#include <kvm.h>

int
main (void)
{
        kvm_t *kd;
        struct kinfo_proc *pinfo;
        int count;

        printf("begin\n");
        kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open");

        if (kd == NULL) {
                perror ("kvm_open");
                exit (1);
        }

        pinfo = kvm_getprocs(kd, KERN_PROC_PID, 6626, &count);

        if (pinfo == NULL) {
                perror ("kvm_getprocs");
                exit (1);
        }

        return 0;
}

=======================

If this doesn't work on your system, then something with your installation
is broken.

> 
> Either I'm doing something wrong [doubtful because of the lack of complexity
> of my test programs], or FreeBSD is screwed... I can't determine which.
> I've been trying to upgrade FreeBSD, but I think I'm going to have to get
> more disk space before I can do that... and I don't even think that will solve
> the problem, since the test program didn't seem to work on a recent-release
> of FreeBSD [2.2.6 ... the current release version].
> 
> Oy vey...
> 
> More as it develops...
> 
> If anyone else expresses interest in working on the port, I do have
> [somewhat] functional code... maybe they'll have more luck compiling
> than I...
> 

Well, can you put it somewhere where other people can get it ? If you
don't know where, I have enabled anonymous ftp uploads at
'ftp.home-of-linux.org'. Just log in as 'anonymous' or 'ftp' and anything
that looks like an email address as passwort and put it into the
'incoming' directory (Note: You can only upload files to this directory,
you cannot fetch them from there again).

Martin

> ...jsled
> 
> PS. If anyone's interested or has played with libkvm in FreeBSD,
> this is what happens with the program...  it's a long shot, but maybe
> someone can help me... I'd really like to use gtop, someday...
> 
> root@ip-206-79-223-152$ [~] gcc -ggdb -lkvm -L/usr/lib -o foo foo.c
> root@ip-206-79-223-152$ [~] gdb ./foo
> GDB is free software and you are welcome to distribute copies of it
>  under certain conditions; type "show copying" to see the conditions.
> There is absolutely no warranty for GDB; type "show warranty" for details.
> GDB 4.16 (i386-unknown-freebsd), 
> Copyright 1996 Free Software Foundation, Inc...
> (gdb) b main
> Breakpoint 1 at 0x1638: file foo.c, line 24.
> (gdb) run
> Starting program: /root/./foo 
> 
> Breakpoint 1, main () at foo.c:24
> 24        printf("begin\n");
> (gdb) n
> begin
> 28        kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open");
> (gdb) 
> 30        if (kd == NULL) {
> (gdb) 
> 35        pinfo = kvm_getprocs(kd, KERN_PROC_PID, 6626, count);
> (gdb) 
> 
> Program received signal SIGBUS, Bus error.
> 0x8019d1b in ?? () from /usr/lib/libkvm.so.2.0
> (gdb) bt
> #0  0x8019d1b in ?? () from /usr/lib/libkvm.so.2.0
> #1  0x1693 in main () at foo.c:35
> 
> 
> -- 
>          To unsubscribe: mail gnome-list-request@gnome.org with 
>                        "unsubscribe" as the Subject.
> 

- -----------------------------------------------------------------
   Martin Baulig - Angewandte Mathematik - Universitaet Trier

   baulig@castor.uni-trier.de, http://www.home-of-linux.org/
   Key: 1024-bit key with ID C8178435 created 1997/01/24 
   ID:  67 C1 84 A0 47 F5 11 C5  5F 68 4C 84 99 05 C3 92
   Finger me for public key or fetch finger.txt from the url above
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