From owner-freebsd-current  Sat Oct  2 16:57: 6 1999
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Date: Sat, 2 Oct 1999 18:56:17 -0500
From: Alan Cox <alc@cs.rice.edu>
To: Bruce Evans <bde@zeta.org.au>
Cc: John Polstra <jdp@polstra.com>,
	"David O'Brien" <obrien@freebsd.org>, current@freebsd.org
Subject: Re: Now that sigcontext is gone ...
Message-ID: <19991002185617.L19202@cs.rice.edu>
References: <XFMail.991002122051.jdp@polstra.com> <Pine.BSF.4.10.9910030928230.4614-100000@alphplex.bde.org>
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In-Reply-To: <Pine.BSF.4.10.9910030928230.4614-100000@alphplex.bde.org>; from Bruce Evans on Sun, Oct 03, 1999 at 09:42:45AM +1000
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On Sun, Oct 03, 1999 at 09:42:45AM +1000, Bruce Evans wrote:
> 
> I think the POSIX way is to use an auxiliary error code in siginfo_t to
> distinguish the causes of the signal.  This only works for SA_SIGINFO
> handlers.  We do something similar using the signal code of 3-arg signal
> handlers.
> 

From Solaris 2.6 _AND_ Digital Unix 4.0E:

      _________________________________________________________
      Signal    Code             Definition
      _________________________________________________________

     SIGSEGV  SEGV_MAPERR    address not mapped to object
              SEGV_ACCERR    invalid permissions for mapped object

     SIGBUS   BUS_ADRALN     invalid address alignment
              BUS_ADRERR     non-existent physical address
              BUS_OBJERR     object specific hardware error


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