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From: "abdulrahman.mahmoud75 at gmail dot com"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29601] New: fclose() doesn't flush the output as it should
 be
Date: Thu, 22 Sep 2022 14:51:31 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.28
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: abdulrahman.mahmoud75 at gmail dot com
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29601

            Bug ID: 29601
           Summary: fclose() doesn't flush the output as it should be
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: abdulrahman.mahmoud75 at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

I have created a mini example to test the fgets() utility but when i run th=
is
example i don't see any output in the shell, below is my example:

#include <stdio.h>

int main () {
   FILE *fp, *fd_3, *fd_2;
   char str[60];
   char str1[] =3D "writing to file ";
   char str2[] =3D "my file";

   fp =3D fopen("file/test_fopen" , "w");
   fclose(fp);
   fd_3 =3D fopen("file/test_fopen" , "r");
   fp =3D fopen("file/test_fopen" , "a");
   fwrite(str1 , 1 , sizeof(str1) , fp);
   if( fgets (str, 60, fd_3)!=3DNULL ) {
      puts(str);
   }
   fclose(fp);
   fd_2 =3D fopen("file/test_fopen" , "a");
   fwrite(str2 , 1 , sizeof(str2) , fd_2);
   if( fgets (str, 60, fd_3)!=3DNULL ) {
      puts(str);
   }
   fclose(fd_2);

   return(0);
}

When i compile and run this code against glibc-2.17 i receive an output
"writing to file" on the shell but when i compile against glibc-2.28, there=
 is
no output.

So is this an expected behavior? is the way of flushing when calling fclose=
()
changed between the two versions?

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