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Bug#430732: marked as done (dlvsym() returns NULL on failure, but does not let dlerror() do the work on failure)

Your message dated Wed, 27 Jul 2016 00:06:54 +0200
with message-id <20160726220654.GA18103@aurel32.net>
and subject line Bug#430732: dlvsym() returns NULL on failure, but does not let dlerror() do the work on failure
has caused the Debian Bug report #430732,
regarding dlvsym() returns NULL on failure, but does not let dlerror() do the work on failure
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
430732: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=430732
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libc6
Version: 2.5-9

dlvsym can fail but does not seem to set dlerror(), contrary to the
manpage, which explains that error conditions should check dlvsym=NULL
and dlerror!=NULL, because 0 is a valid address.
The same can be said about dlsym also.



The following code outputs:
	(nil)
which is not expected.



/*BINFMTC: -ldl
 dlvsym test code
 */
#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>

int main()
{
  dlerror();
  if (!dlvsym(RTLD_NEXT, "chown", "NONEXIST"))
    {
      printf("%p\n", dlerror());
    }
  return 0;
}



regards,
	junichi
-- 
dancer@{debian.org,netfort.gr.jp}   Debian Project

--- End Message ---
--- Begin Message --- 
control: forwarded -1 https://sourceware.org/bugzilla/show_bug.cgi?id=19509
control: close -1 glibc/2.23.90+20160507.87523e9-1

On 2007-06-27 06:53, Junichi Uekawa wrote:
> Package: libc6
> Version: 2.5-9
> 
> dlvsym can fail but does not seem to set dlerror(), contrary to the
> manpage, which explains that error conditions should check dlvsym=NULL
> and dlerror!=NULL, because 0 is a valid address.
> The same can be said about dlsym also.
> 
> 
> 
> The following code outputs:
> 	(nil)
> which is not expected.
> 
> 
> 
> /*BINFMTC: -ldl
>  dlvsym test code
>  */
> #define _GNU_SOURCE
> #include <dlfcn.h>
> #include <stdio.h>
> 
> int main()
> {
>   dlerror();
>   if (!dlvsym(RTLD_NEXT, "chown", "NONEXIST"))
>     {
>       printf("%p\n", dlerror());
>     }
>   return 0;
> }

It happens this bug has been reported upstream has bz #19509. This bug
has been fixed in the about to be released glibc 2.24. A version with 
this fix is available in experimental. I am therefore closing the bug
with this version.

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

--- End Message ---
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