[Bug libc/22273] Improper assert in Linux posix_spawn implementation

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22273

--- Comment #8 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Adhemerval Zanella from comment #7)
> (In reply to Andreas Schwab from comment #6)
> > You need to use a positive error number, not -1.
> 
> Indeed and still it won't help the case where the process is killed after
> setting args.err to 0 and I do not see how to correctly report it to user. 
> Even if we check waitpid unconditionally (with WNOHANG) for ec != 0 it might
> a case where the required program runs and it is killed just before the
> actual waitpid test. Any idea?

One option I have in mind is create the child with CLONE_CHILD_SETTID and call
set_tid_address with args.err as input (I am using set_tid_address to avoid
have to adjust each clone signature to take ctid in correct order).

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