From owner-freebsd-hackers Tue Sep 28 11:13:46 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from wall.polstra.com (rtrwan160.accessone.com [206.213.115.74]) by hub.freebsd.org (Postfix) with ESMTP id ABEB314CBE for ; Tue, 28 Sep 1999 11:13:44 -0700 (PDT) (envelope-from jdp@polstra.com) Received: from vashon.polstra.com (vashon.polstra.com [206.213.73.13]) by wall.polstra.com (8.9.3/8.9.3) with ESMTP id LAA11181; Tue, 28 Sep 1999 11:13:43 -0700 (PDT) (envelope-from jdp@polstra.com) From: John Polstra Received: (from jdp@localhost) by vashon.polstra.com (8.9.3/8.9.1) id LAA12154; Tue, 28 Sep 1999 11:13:42 -0700 (PDT) (envelope-from jdp@polstra.com) Date: Tue, 28 Sep 1999 11:13:42 -0700 (PDT) Message-Id: <199909281813.LAA12154@vashon.polstra.com> To: drdavis@calderasystems.com Subject: Re: Netscape Bus Error In-Reply-To: <37F0DC3D.7F4A969D@calderasystems.com> References: <49064d67.252125e1@aol.com> <199909272010.OAA12060@mt.sri.com> <37F0DC3D.7F4A969D@calderasystems.com> Organization: Polstra & Co., Seattle, WA Cc: hackers@freebsd.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In article <37F0DC3D.7F4A969D@calderasystems.com>, Darren R. Davis wrote: > I believe that a Bus Error is specifically referencing miss aligned > data vs segmentation violation (SIGSEGV) which is accessing data > that is either free'd or not yours, etc. That was the traditional distinction, but it's different on FreeBSD/i386. SIGSEGV means you accessed memory that is unmapped. SIGBUS means you accessed memory that is mapped, but protected (unwritable and/or unreadable). To further confuse matters, FreeBSD/alpha generates SIGSEGV for both cases. John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "No matter how cynical I get, I just can't keep up." -- Nora Ephron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message