Date: 31 May 2001 14:57:11 +0800 From: Jiangyi Liu <gzjyliu@public.guangzhou.gd.cn> To: diman@asd-g.com (diman) Cc: freebsd-hackers@FreeBSD.org Subject: Re: Weird PT_DETACH Message-ID: <878zjerooo.fsf@fatcow.home> In-Reply-To: <Pine.BSF.4.21.0105301420150.201-100000@portal.none.ua> References: <006a01c0e911$96e68720$a701160a@fatcow> <Pine.BSF.4.21.0105301420150.201-100000@portal.none.ua>
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Hi,
I tried to use (caddr_t)1 in PT_DETACH, but the code just
failed. I'm confused. It just seems the execve is stopped. Maybe I'd read
through the kernel source code to figure out where the problem is.
Jiangyi
diman@asd-g.com (diman) writes:
> Hope your program not named "./test" ??
> I changed it to /bin/sh and it works just fine.
> It was hard to debug due to my own proggie bug :)
> bb.
>
>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/ptrace.h>
>
> int main()
> {
> pid_t pid;
>
> if(!(pid=fork())) {
> /* child */
> ptrace(PT_TRACE_ME, 0, 0, 0);
> puts("child speaking");
> execve("./test", NULL, NULL); <---------- ??
> } else {
> wait(0);
> ptrace(PT_DETACH, pid, (caddr_t)1, 0); <---------- also
> exit(0);
> }
> }
>
>
>
>
>
> On Wed, 30 May 2001, Jiangyi Liu wrote:
>
> >
> > >
> > > If i understand ptrace(2) manual page correctly,
> > > you should use
> > > ptrace(PT_DETACH,pid,(caddr_t)1,0)
> > > instead of
> > > ptrace(PT_DETACH,pid,0,0) .
> > >
> >
> > If you read my first post again, you will know that indeed I've tried to use (caddr_t)1 but failed too.
> >
> > > BTW you code is *very hard to debug* on my 4.1.1 :)
> > > What your uname -a tells you?
> >
> > Why? My box is 4.3-STABLE.
> >
> > Jiangyi
> >
>
>
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