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From: "Arfrever.FTA at GMail dot Com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/14989] dlerror() returns garbage
Date: Mon, 31 Dec 2012 09:18:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14989

Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail dot Com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |
     Ever Confirmed|1                           |0

--- Comment #2 from Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail dot Com> 2012-12-31 09:18:23 UTC ---
Failure of second dlclose() is expected. This bug is about wrong library name
in message returned by dlerror(). dlerror() returns correct name of library in
case of libc.so.6, but not in case of majority of other libraries.

$ cat dlerror_test.c
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char** argv)
{
  int i;
  for (i = 1; i < argc; i++)
  {
    char buffer[1024];
    snprintf(buffer, 1024, "%s:", argv[i]);
    printf("%-20s", buffer);
    void* handle = dlopen(argv[i], RTLD_NOW);
    if (handle)
    {
      dlclose(handle);
      dlclose(handle);
      printf("dlerror() after double dlclose() : ");
    }
    else
    {
      printf("dlerror() after dlopen()  : ");
    }
    printf("'%s'\n", dlerror());
  }
}
$ gcc -o dlerror_test dlerror_test.c -ldl
$ ./dlerror_test libncurses.so.5 libreadline.so.6 libz.so.1 libc.so.6
libncurses.so.5:    dlerror() after double dlclose() : '0%>: shared object not
open'
libreadline.so.6:   dlerror() after double dlclose() : '*>: shared object not
open'
libz.so.1:          dlerror() after double dlclose() : 'P%>: shared object not
open'
libc.so.6:          dlerror() after double dlclose() : '/lib64/libc.so.6:
shared object not open'

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