From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-39153-listarch-gdb=sources.redhat.com@sourceware.org>
Received: (qmail 21025 invoked by alias); 3 May 2011 09:31:07 -0000
Received: (qmail 21016 invoked by uid 22791); 3 May 2011 09:31:06 -0000
X-SWARE-Spam-Status: No, hits=-1.8 required=5.0	tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,RFC_ABUSE_POST,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By: sourceware.org
Received: from mail-vw0-f41.google.com (HELO mail-vw0-f41.google.com) (209.85.212.41)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 03 May 2011 09:30:48 +0000
Received: by vws4 with SMTP id 4so6254193vws.0        for <gdb@sourceware.org>; Tue, 03 May 2011 02:30:48 -0700 (PDT)
Received: by 10.220.187.4 with SMTP id cu4mr2658345vcb.58.1304415048118; Tue, 03 May 2011 02:30:48 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.220.61.6 with HTTP; Tue, 3 May 2011 02:30:28 -0700 (PDT)
From: Kevin Pouget <kevin.pouget@gmail.com>
Date: Tue, 03 May 2011 09:31:00 -0000
Message-ID: <BANLkTimaaW-m88=e+4Qbz0NfSfzN0T4WCA@mail.gmail.com>
Subject: Breakpoint duplication over new inferiors
To: gdb@sourceware.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-IsSubscribed: yes
Mailing-List: contact gdb-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb.sourceware.org>
List-Subscribe: <mailto:gdb-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb/>
List-Post: <mailto:gdb@sourceware.org>
List-Help: <mailto:gdb-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-owner@sourceware.org
X-SW-Source: 2011-05/txt/msg00014.txt.bz2

Hello,

I'd like to understand how breakpoints are supposed to be duplicated
when a new inferior is started/attached (in my cases)/forked.

Namely, with a code like:
>
> 1=A0=A0=A0 int main() {
> 2=A0=A0=A0 =A0=A0=A0 if (fork()) {
> 3=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 send (0,0,0);
> 4=A0=A0=A0 =A0=A0=A0 } else {
> 5=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 recv(0,0,0) ;
> 6=A0=A0=A0 =A0=A0=A0 }
> 7=A0=A0=A0 }

and
>
> (gdb) b main
> Breakpoint 1 at 0x400558: file fork.c, line 2.
> (gdb) b send
> Breakpoint 2 at 0x400448
> (gdb) set detach-on-fork off
> (gdb) run
> ...
> (gdb) info breakpoint
> Num=A0=A0=A0=A0 Type=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Disp Enb Address=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0 What
> 1=A0=A0=A0=A0=A0=A0 breakpoint=A0=A0=A0=A0 keep y=A0=A0 <MULTIPLE>
> =A0=A0=A0 breakpoint already hit 1 time
> 1.1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 y=A0=A0=A0=A0 0x0000000000400558 in main at fork.c:2 inf 2
> 1.2=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 y=A0=A0=A0=A0 0x0000000000400558 in main at fork.c:2 inf 1
> 2=A0=A0=A0=A0=A0=A0 breakpoint=A0=A0=A0=A0 keep y=A0=A0 0x0000003cbd0e1a6=
0 <send> inf 1

it seems that `libc' breakpoints are not correctly duplicated.
According to my investigation, the difference occurs in
> breakpoint.c:addr_string_to_sals -- sals =3D decode_line_1 (&s, 1, (struc=
t symtab *) NULL, 0, NULL);

which doesn't return two locations, but only one ...
is it a bug? any idea what to do to solve it?


cordially,

Kevin