Re: problem using dladdr API in NetBSD

[christos%astron.com@localhost (Christos Zoulas)]

In article 
<515c64960810092215y19d00664nf201170263dd3e64%mail.gmail.com@localhost>,
Channa  <channa.kad%gmail.com@localhost> wrote:
>Hi All,
>I am executing the following test case on NetBSD 3.1 to check the
>functionality of dladdr ()
>
>int main () {
>  void *handle;
>  int (*sym) (void);
>  Dl_info info;
>  int ret;
>  int test_fail=0;
>  handle = dlopen (LIB_NAME , RTLD_NOW);
>  if (handle == NULL)  {
>    printf("Dlopen failed\n");
>    return -1
> }
>  sym = dlsym (handle, SYM_NAME);
>  if (sym == NULL) {
>    printf("Dlsym failed\n");
>     return -1;
> }
>  memset (&info, 0, sizeof (info));
>  ret = dladdr (sym, &info);
>  printf ("address of symbol : %s  = %lx\n", SYM_NAME,sym);
>  printf ("info.dli_fname = %p (\"%s\")\n", info.dli_fname, info.dli_fname);
>  printf ("info.dli_fbase = %p\n", info.dli_fbase);
>  printf ("info.dli_sname = %p (\"%s\")\n", info.dli_sname, info.dli_sname);
>  printf ("info.dli_saddr = %p\n", info.dli_saddr);
>  dlclose (handle);
>}
>
>I am always getting the info.dli_sname as NULL string.
>dladdr is not able to find the symbol.
>On checking the code in rtld.c
>
>Line No:792        for (symoffset = 0; symoffset < obj->nchains; symoffset++) {
>                             ........
>                           ..........
>              }
>
>The dladdr is not entering this loop, sicne obj->nchains is 0 always.
>
>Can anyone tell me what is the problem??
>Any help will be greatly appreciated.

Dunno, works for me on
NetBSD rebar.astron.com 4.99.1 NetBSD 4.99.1 (ASTRON) #2: Fri Sep  8 15:10:53 
EDT 2006  
christos%rebar.astron.com@localhost:/usr/src/sys/arch/i386/compile/ASTRON i386

address of symbol : printf  = 0xbbbac360
info.dli_fname = 0xbbbee0c0 ("/usr/lib/libc.so.12")
info.dli_fbase = 0xbbb0f000
info.dli_sname = 0xbbb206ad ("printf")
info.dli_saddr = 0xbbbac360

christos