From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11358 invoked by alias); 16 Jan 2003 10:36:03 -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 11337 invoked by uid 71); 16 Jan 2003 10:36:01 -0000 Resent-Date: 16 Jan 2003 10:36:01 -0000 Resent-Message-ID: <20030116103601.11336.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, peturr02@ru.is Received: (qmail 11308 invoked by uid 61); 16 Jan 2003 10:35:51 -0000 Message-Id: <20030116103551.11307.qmail@sources.redhat.com> Date: Thu, 16 Jan 2003 10:36:00 -0000 From: peturr02@ru.is Reply-To: peturr02@ru.is To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: libstdc++/9339: filebuf::pubsetbuf(0, 0) doesn't turn off buffering X-SW-Source: 2003-01/txt/msg00998.txt.bz2 List-Id: >Number: 9339 >Category: libstdc++ >Synopsis: filebuf::pubsetbuf(0, 0) doesn't turn off buffering >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Thu Jan 16 02:36:01 PST 2003 >Closed-Date: >Last-Modified: >Originator: peturr02@ru.is >Release: gcc-3.2.1 >Organization: >Environment: Red Hat Linux 8.0 >Description: Calling fb.pubsetbuf(0, 0) on a basic_filebuf<> fb only turns off the filebuf's own buffers, not the buffers in the underlying FILE*, so fb remains buffered in effect. >How-To-Repeat: See attachment. >Fix: Call setbuf(f, 0) after f = fopen() if unbuffered I/O has been requested. >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/plain; name="filesetbufbug.cc" Content-Disposition: inline; filename="filesetbufbug.cc" #include #include using namespace std; int main() { filebuf fbuf01; fbuf01.pubsetbuf(0, 0); fbuf01.open("tmp", ios_base::out | ios_base::trunc); fbuf01.pubsetbuf(0, 0); fbuf01.sputn("g++", 3); filebuf fbuf02; fbuf02.open("tmp", ios_base::in); char buf[256]; int n = fbuf02.sgetn(buf, 256); assert(n > 0); return 0; }