From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2135 invoked by alias); 20 May 2002 17:16:06 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 2092 invoked by uid 71); 20 May 2002 17:16:02 -0000 Resent-Date: 20 May 2002 17:16:02 -0000 Resent-Message-ID: <20020520171602.2091.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-To: nobody@gcc.gnu.org Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, tony.oliver@mci.co.uk Received:(qmail 31726 invoked by uid 61); 20 May 2002 17:13:06 -0000 Message-Id:<20020520171306.31723.qmail@sources.redhat.com> Date: Mon, 20 May 2002 10:16:00 -0000 From: tony.oliver@mci.co.uk Reply-To: tony.oliver@mci.co.uk To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version:gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: libstdc++/6746: ifstream::readsome() always returns zero X-SW-Source: 2002-05/txt/msg00617.txt.bz2 List-Id: >Number: 6746 >Category: libstdc++ >Synopsis: ifstream::readsome() always returns zero >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Mon May 20 10:16:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Tony Oliver >Release: gcc-3.1 >Organization: >Environment: sparc-sun-solaris2.8 Thread model: posix >Description: Calling ifstream::readsome() always yields a return value of zero (no bytes read). No stream error flags are set. This behaviour has been introduced in release gcc-3.1: it worked fine in gcc-3.0.4. The problem appears to be confined to the filebuf part of ifstream, not the istream part, since (for instance) istringstream::readsome() does not suffer from this problem. My installation of gcc-3.1 was configured with the following options (/home/to0001/ is my networked home directory): --prefix=/home/to0001/app/gcc-3.1 --enable-languages=c,c++ --disable-shared --verbose Trivial test program source code attached. Expected output (as output by gcc-3.0.4 version): 308 (308) 0 (308) Actual output: 0 (0) 0 (0) 0 (0) ... [forever] >How-To-Repeat: g++ -ansi -pedantic -Wall -o gcc-test gcc-test.c++ gcc-test >Fix: >Release-Note: >Audit-Trail: >Unformatted: