Subject: Re: CVS commit: src/lib/libpthread
To: YAMAMOTO Takashi <firstname.lastname@example.org>
From: Valeriy E. Ushakov <email@example.com>
Date: 11/20/2003 19:38:51
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.
firstname.lastname@example.org | Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/ | Ist zu Grunde gehen