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X-HELO: vmicros1.altlinux.org
Date: Tue, 06 Jun 2017 10:58:00 -0000
From: "Dmitry V. Levin" <ldv@altlinux.org>
To: Andreas Schwab <schwab@suse.de>
Cc: Stefan Liebler <stli@linux.vnet.ibm.com>, libc-alpha@sourceware.org,
	Carlos O'Donell <carlos@redhat.com>
Subject: Re: [PATCH] S390: Sync ptrace.h with kernel. [BZ #21539]
Message-ID: <20170606105845.GB20285@altlinux.org>
Mail-Followup-To: Andreas Schwab <schwab@suse.de>,
	Stefan Liebler <stli@linux.vnet.ibm.com>, libc-alpha@sourceware.org,
	Carlos O'Donell <carlos@redhat.com>
References: <bda685cb-c5c4-ab27-47e0-1e95223275f9@linux.vnet.ibm.com>
 <mvmbmq1s8ej.fsf@suse.de>
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On Tue, Jun 06, 2017 at 12:44:04PM +0200, Andreas Schwab wrote:
> On Jun 06 2017, Stefan Liebler <stli@linux.vnet.ibm.com> wrote:
[...]
> > +static void
> > +tracer_func (int pid)
> > +{
> > +  unsigned long last_break;
> > +  ptrace_area parea;
> > +  gregset_t regs;
> > +  int status;
> > +
> > +  while (1)
> > +    {
> > +      /* Wait for the tracee to be stopped or exited.  */
> > +      wait (&status);
>=20
> Doesn't that need to use WUNTRACED?

No, it doesn't: as the tracee has called PTRACE_TRACEME before raising
SIGSTOP, there is going to be a ptrace signal delivery stop.


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