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* Re: libstdc++/8127: cout << cin.rdbuf() causes infinite loop
@ 2002-11-25 9:15 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2002-11-25 9:15 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, lennox, nobody
Synopsis: cout << cin.rdbuf() causes infinite loop
State-Changed-From-To: analyzed->closed
State-Changed-By: paolo
State-Changed-When: Tue Nov 19 01:36:29 2002
State-Changed-Why:
I'm closing it: by now we understand those issues, which are
fixed as far as correctness in concerned.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8127
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: libstdc++/8127: cout << cin.rdbuf() causes infinite loop
@ 2002-10-06 5:03 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2002-10-06 5:03 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, lennox, nobody
Synopsis: cout << cin.rdbuf() causes infinite loop
State-Changed-From-To: open->analyzed
State-Changed-By: paolo
State-Changed-When: Sun Oct 6 05:03:04 2002
State-Changed-Why:
Confirmed. This is actually a duplicate of c++/6745, but I'm
not closing it since some additional information is provided.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8127
^ permalink raw reply [flat|nested] 3+ messages in thread
* libstdc++/8127: cout << cin.rdbuf() causes infinite loop
@ 2002-10-02 13:56 lennox
0 siblings, 0 replies; 3+ messages in thread
From: lennox @ 2002-10-02 13:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 8127
>Category: libstdc++
>Synopsis: cout << cin.rdbuf() causes infinite loop
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Oct 02 13:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: lennox@cs.columbia.edu
>Release: gcc-3.1
>Organization:
>Environment:
sparc-sun-solaris2.8
>Description:
The attached trivial implementation of 'cat' goes into an infinite loop when compiled with GCC 3.1.
This may be another instance of bug libstdc++/8071, interacting with libstdc++/7744. However, it seems to me that this is a much more significant example of the bug.
The problem arises in basic_streambuf::__copy_streambufs.
This function calls __sbout->in_avail() to get the number of characters that it can read. If this returns 0, the function loops forever calling __sbout->sputn(__sbin->gptr(), 0).
This is a regression from gcc 2.95.2, which executes this code correctly.
(I haven't tested this code with GCC 3.3 mainline, but I don't see anything in GNATS or viewcvs which would indicate that this code has changed since 3.1.)
>How-To-Repeat:
Compile the attached program, and run it with standard input coming from somewhere. E.g.:
grandcentral $ g++-2.95.2 -Wall -g -O2 -o test-rdbuf test-rdbuf.cxx
grandcentral $ ./test-rdbuf < /etc/nodename
grandcentral.cs.columbia.edu
grandcentral $ g++ -Wall -g -O2 -o test-rdbuf test-rdbuf.cxx
grandcentral $ ./test-rdbuf < /etc/nodename
^C
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test-rdbuf.cxx"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test-rdbuf.cxx"
I2luY2x1ZGUgPGlvc3RyZWFtPgoKdXNpbmcgbmFtZXNwYWNlIHN0ZDsKCmludCBtYWluKCkKewog
IGNvdXQgPDwgY2luLnJkYnVmKCk7Cn0K
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-11-25 9:15 libstdc++/8127: cout << cin.rdbuf() causes infinite loop paolo
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2002-10-06 5:03 paolo
2002-10-02 13:56 lennox
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