[Linux] huge empty file created after an ungetwc() followed by fwide()
----------------------------------------------------------------------
Key: STDCXX-428
URL: https://issues.apache.org/jira/browse/STDCXX-428
Project: C++ Standard Library
Issue Type: Bug
Reporter: Martin Sebor
Attachments: strace.out
>From https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241309:
-------- Original Message --------
Subject: [Bug 241309] New: huge empty file created after an ungetwc() followed
by fwide()
Date: Thu, 24 May 2007 19:50:56 -0400
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug report.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241309
Summary: huge empty file created after an ungetwc() followed by
fwide()
Product: Red Hat Enterprise Linux
Version: 4.4
Platform: All
OS/Version: Linux
Status: NEW
Severity: medium
Priority: medium
Component: glibc
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
QAContact: [EMAIL PROTECTED]
We're seeing the following unusual behavior of the program below on Red Hat
Advanced Server 4, Update 4:
$ cat t.c && gcc t.c && rm -f foo.out && ./a.out > foo.out && ls -l foo.out &&
du -k foo.out
#include <stdio.h>
#include <wchar.h>
int main ()
{
puts ("");
ungetwc ('A', stdout);
fwide (stdout, 0);
return 0;
}
-rw-r--r-- 1 sebor devel 182888783729 May 24 16:44 foo.out
16 foo.out
The output of strace on the program is in the attached file.
Here's info on libc:
$ ldd a.out && /lib64/tls/libc.so.6
libc.so.6 => /lib64/tls/libc.so.6 (0x000000381b500000)
/lib64/ld-linux-x86-64.so.2 (0x000000381b100000)
GNU C Library stable release version 2.3.4, by Roland McGrath et al.
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 3.4.6 20060404 (Red Hat 3.4.6-2).
Compiled on a Linux 2.4.20 system on 2006-07-04.
Available extensions:
GNU libio by Per Bothner
crypt add-on version 2.1 by Michael Glad and others
Native POSIX Threads Library by Ulrich Drepper et al
RT using linux kernel aio
The C stubs add-on version 2.1.2.
GNU Libidn by Simon Josefsson
BIND-8.2.3-T5B
NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Thread-local storage support included.
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.
------- Additional Comments From [EMAIL PROTECTED] 2007-05-24 19:50 EST -------
Created an attachment (id=155405)
--> (https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=155405&action=view)
Output of strace ./a.out >/dev/null 2>/dev/pts/1
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