PS and Minix-386.

Bevan Anderson

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Mar 30, 1991, 12:18:43 AM3/30/91

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Hi

I have yet another problem with Minix-386. After recompiling init
I got it up and running. Now I have another problem.

I recompiled ps.c with bcc -3 so to give me a 32 bit
binary. Now when I execute ps (as root) I get:

memory fault: core dumped.

This happens after ps puts up the top line of the output (TTY LINE etc)
I am doing a ps -U but that gets the same problem.

Can anyone help?

Bye,
Bevan.
_______________________________________________________________________________

Bevan Anderson. Engineering
be...@ecr.mu.oz.au Melbourne Uni.

Kevin Brown

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Mar 30, 1991, 9:03:00 PM3/30/91

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In article <72...@munnari.oz.au> be...@ecr.mu.oz.au (Bevan Anderson) writes:

>I recompiled ps.c with bcc -3 so to give me a 32 bit
>binary. Now when I execute ps (as root) I get:
>
>memory fault: core dumped.
>
>This happens after ps puts up the top line of the output (TTY LINE etc)
>I am doing a ps -U but that gets the same problem.
>
>Can anyone help?

The problem you describe has bitten me a number of times (you'd think
I'd know better by now :-).

Ps expects the kernel files to be located in /usr/src/kernel/kernel,
/usr/src/fs/fs, and /usr/src/mm/mm. However, the Minix-386 makefiles
put those images in /tmp. So before you do a ps -U, copy /tmp/kernel to
/usr/src/kernel/kernel, /tmp/mm to /usr/src/mm/mm, and /tmp/fs to
/usr/src/fs/fs.

The problem you're having is that ps -U is getting its symbol information
from the OLD kernel, and that symbol information is now bogus. Thus,
the memory fault.

An additional note: you MUST compile ps.c with -DINTEL_32BITS. Otherwise
it will be confused about the size of the buffer cache, as an example.

>Bye,
>Bevan.

--
Kevin Brown Disclaimer: huh?
ke...@nuchat.sccsi.com csci...@cl.uh.edu

Minix -- the Unix[tm] of the 90's. System V -- the Multics of the 90's. :-)

Phil Kemp

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Mar 31, 1991, 1:13:10 AM3/31/91

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In <72...@munnari.oz.au> be...@ecr.mu.oz.au (Bevan Anderson) writes:

>I recompiled ps.c with bcc -3 so to give me a 32 bit
>binary. Now when I execute ps (as root) I get:

>memory fault: core dumped.

>This happens after ps puts up the top line of the output (TTY LINE etc)
>I am doing a ps -U but that gets the same problem.

I too have had similar problems with the various versions of ps with
the 386 Minix kernel. Maybe someone could post a version of ps.c which
does in fact work with Bruce's 386 Minix...

I know I would sure appreciate it.

Thanks.
PK
--
Phil Kemp
CONVEX Computer of Canada Ltd.
Voice:(403)-233-2815
UUCP:ke...@convex.com

torv...@cc.helsinki.fi

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Apr 1, 1991, 7:30:39 AM4/1/91

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RTFSC (Read the F**ing Source Code :-) - It is heavily commented and the
solution should be obvious (take that with a grain of salt, it certainly
stumped me for a while :-). Simply change the 4 define-lines at the
start (well, I'd guess about line 40) that read

#define kernel "/usr/src/kernel/kernel"
#define mm "/usr/src/mm/mm"
#define fs "/usr/src/fs/fs"
#define init "/usr/src/tools/init"

to where-ever you have them now (/etc/system/kernel,fs,init,mm if you
did as the tutor that is floating around said)

NOTE! I wrote this from memory - this is certainly not exactly how the
defines look (and I'm not certain that there is a define for init, I
think it never gets used). It should be no problem finding them though -
there should be nothing like it elsewhere in ps.c. It is inside a #if by
the way. Cdiffs might be a good idea, but I don't have access to my
minix-box right now. Doing them manually wasn't any problem.

Linus Torvalds torv...@cc.helsinki.fi