From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <glibc-bugs-return-18857-listarch-glibc-bugs=sources.redhat.com@sourceware.org>
Received: (qmail 12613 invoked by alias); 6 Jun 2013 05:53:08 -0000
Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <glibc-bugs.sourceware.org>
List-Subscribe: <mailto:glibc-bugs-subscribe@sourceware.org>
List-Post: <mailto:glibc-bugs@sourceware.org>
List-Help: <mailto:glibc-bugs-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: glibc-bugs-owner@sourceware.org
Received: (qmail 12578 invoked by uid 48); 6 Jun 2013 05:53:04 -0000
From: "lizhijian at cn dot fujitsu.com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/15589] freopen would close oldfd even though oldfd is same as newfd
Date: Thu, 06 Jun 2013 05:53:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.16
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: lizhijian at cn dot fujitsu.com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields:
Message-ID: <bug-15589-131-J4MNj0fhtP@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-15589-131@http.sourceware.org/bugzilla/>
References: <bug-15589-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-06/txt/msg00036.txt.bz2

http://sourceware.org/bugzilla/show_bug.cgi?id=15589

--- Comment #1 from lizhijian <lizhijian at cn dot fujitsu.com> ---
A simple C program(freopen-test.c) to reproduce this problem.

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>

int main(void)
{
        char *file1 = "./file1";
        char *file2 = "./file2";
        FILE *fp1, *fp2;
        struct stat stat_buf;

        if((fp1 = freopen(file1, "r", stdin)) == NULL)
                printf("[E+] freopen error(%s)\n", strerror(errno));

        if (fstat(fileno(stdin), &stat_buf) == 0) {
                printf("[S+] close stdin\n");
                close(0);  //close stdin
        }

        if (fstat(fileno(stdin), &stat_buf) == -1) {
                printf("[S+] stat return error(%s)\n", strerror(errno));
                if ((fp2 = freopen(file2, "r", stdin)) == NULL) {
                        printf("[E+] freopen return
error(%s)\n",strerror(errno));
                        return -1;
                }
        }
        if (fstat(fileno(fp2), &stat_buf) == -1) {
                printf("[E+] freopen return success, but the newfd was
closed\n");
                return -1;
        }

        fclose(fp1);
        fclose(fp2);
        printf("[S+] freopen test PASS\n");
}
------------------------
# gcc freopen-test.c -o freopen-test
# touch file1 file2
# ./freopen-test
[E+] freopen error(No such file or directory)
[S+] stat return error(Bad file descriptor)
[E+] freopen return error(No such file or directory)

# rpm -q glibc
glibc-2.16-29.el7.x86_64

-- 
You are receiving this mail because:
You are on the CC list for the bug.