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[Bug libc/15589] freopen would close oldfd even though oldfd is same as newfd
- From: "lizhijian at cn dot fujitsu.com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 06 Jun 2013 05:53:03 +0000
- Subject: [Bug libc/15589] freopen would close oldfd even though oldfd is same as newfd
- Auto-submitted: auto-generated
- References: <bug-15589-131 at http dot sourceware dot org/bugzilla/>
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
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