Quoting Nathan Lynch ([email protected]):
> On Thu, 2009-11-12 at 23:24 -0600, [email protected] wrote:
> > + if (use_clone) {
> > + int stacksize = 4*getpagesize();
> > + void *stack = malloc(stacksize);
> > +
> > + if (!stack) {
> > + perror("malloc");
> > + return -1;
> > + }
> > +
> > + printf("about to clone with %lx\n", flags);
> > + if (chosen_pid)
> > + printf("Will choose pid %d\n", chosen_pid);
> > + flags |= SIGCHLD;
> > + pid = clone_with_pids(do_child, stack, flags, &pid_set,
> > + (void *)argv);
>
> The stack argument should be adjusted with the usual stack += stacksize
> - 1 or similar, right?
the clone_with_pids() helper in user-cr/clone_s390x.c (and IIRC the
x86 one by Suka also) does this implicitly, by doing:
s = child_stack;
*--s = arg;
*--s = fn;
child_stack -= 16
-serge
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