Date: Mon, 2 Nov 1998 03:50:53 -0500 (EST) From: Brian Feldman <green@zone.syracuse.net> To: Mike Smith <mike@smith.net.au> Cc: current@FreeBSD.ORG Subject: Re: Linux clone() Message-ID: <Pine.BSF.4.05.9811020346560.9280-100000@zone.syracuse.net> In-Reply-To: <199811020814.AAA08887@dingo.cdrom.com>
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Okay, thanks a bunch! I was worried about munging up my esp there :)
Anyway, I think it's about time to get a Linux user to a. make me a
program that uses clone and b. make me a ptrace of it. I suppose I'll post
the finished patch to freebsd-emulation when I get it finished, because
I'm not entirely certain why I posted it here in the first place... except
maybe that -current has the most generous testers usually!
Cheers,
Brian Feldman
On Mon, 2 Nov 1998, Mike Smith wrote:
> > Okay, guys, I think I've gotten a linux clone() syscall implemented... As
>
> Neat. Wrong list perhaps though. (-emulation)
>
> > of now, I have nothing to test it with :( The only thing I have to try it
> > with is MpegTV, and for some really crazy reason:
> > linux_clone()->(1569, 1570); child eip=0xf00, esp=0x80ed0b4
> > Now come on, passing 0xf00 as the void *fn (really int (*fn)(void *)) is
> > pretty damned bogus (but hey, it's not zero, so it turns into the child's
> > instruction pointer...) If anyone has any REALY examples of programs to
> > test with this, let me know....
>
> First off; what do you get if you trace it on a Linux system? Are you
> sure the args are formatted correctly?
>
> > This is a pretty important thing to have,
> > when lots more apps use linuxthreads (i.e. StarOffice 5.0).
>
> No kidding.
>
> > Oh, BTW,
> > someone tell me if this would be something really terrible to accidentally
> > do in kernel space:
> > printf("%d %d %#x %#x");
> > note no arguments... so far I don't notice any destabilization but I sure
> > hope I didn't fudge up the kernel stack!
>
> Nope; that's generally harmless, just prints lots of garbage.
>
> As for test apps; someone ought to be able to build you a trivial
> clone() test program on a Linux system.
>
> --
> \\ Sometimes you're ahead, \\ Mike Smith
> \\ sometimes you're behind. \\ mike@smith.net.au
> \\ The race is long, and in the \\ msmith@freebsd.org
> \\ end it's only with yourself. \\ msmith@cdrom.com
>
>
>
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