lt_dlerror() not returning NULL when no error

[Sebastien Sable]

I have the following code that works (identbrl is not NULL and it
works ok when called) :

  identbrl = lt_dlsym(library, "identbrl");

however if I add the following code :

  identbrl = lt_dlsym(library, "identbrl");
  strerror = lt_dlerror();
  if (strerror)
    {
      Log(LOG_ERR, "%s", strerror);
      return 0;
    }

I get an "unknown error" message.

So lt_dlerror must be returning non-NULL while there is no error. But
its documentation says :

Function: {const char *}lt_dlerror (void)
Return a human readable string describing the most recent error that
occurred from any of libltdl's functions. Return NULL if no errors
have occurred since initialization or since it was last called.

I used lt_dlerror instead of checking if lt_dlsym returns a NULL value
because of a comment in the autobook :

http://sources.redhat.com/autobook/autobook/autobook_169.html#SEC169

run = (entrypoint *) lt_dlsym (module, "run");

/* In principle, run might legitimately be NULL, so
   I don't use run == NULL as an error indicator
   in general. */
errormsg = dlerrordup (errormsg);
if (errormsg != NULL)
  {
    errors = lt_dlclose (module);
    module = NULL;
  }

So how am I supposed to check if there is an error with lt_dlsym()? by
checking if lt_dlsym() is non-NULL or by checking if lt_dlerror() is
non-NULL or something else?

  identbrl = lt_dlsym(library, "identbrl");
  if (!identbrl)
    {
      strerror = lt_dlerror();
      Log(LOG_ERR, "Driver symbol not found identbrl : %s", strerror);
      return 0;
    }

thanks in advance

-- 
Sébastien Sablé <address@hidden>
http://inova.snv.jussieu.fr/~sable/