Subject: Re: CVS commit: src/lib/libpthread
To: YAMAMOTO Takashi <email@example.com>
From: Valeriy E. Ushakov <firstname.lastname@example.org>
Date: 11/20/2003 19:42:49
On Thu, Nov 20, 2003 at 19:38:51 +0300, Valeriy E. Ushakov wrote:
> On Thu, Nov 20, 2003 at 15:46:42 +0000, YAMAMOTO Takashi wrote:
> > Module Name: src
> > Committed By: yamt
> > Date: Thu Nov 20 15:46:42 UTC 2003
> > Modified Files:
> > src/lib/libpthread: pthread_sig.c
> > Log Message:
> > pthread__deliver_signal: swap oldmask and siginfo so that signal
> > handler's stack doesn't stomp siginfo.
> > this also fixes !__HAVE_SIGINFO, in that case
> > pthread__signal_tramp assumes uc->uc_stack.ss_sp points the old
> > signal mask.
> > pointed by uwe@.
> Uh... I probably don't understand this code fully, but consider that
> the uc is on the stack right above (lower addresses) the sigset_t
> pointed to by maskp. So if you set ss_sp in the uc to maskp and if
> the platform passes arguments via stack, makecontext will write them
> at the end of uc (above ss_sp = maskp). We probably get away with
> this because of the PAD in the ucontext.
Before maskp was added in 188.8.131.52, the code read:
uc->uc_stack.ss_sp = uc;
i.e. stack above uc (ss_size is zero) - which, I think, is the correct
email@example.com | Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/ | Ist zu Grunde gehen