pthread_atfork is "hidden" -- bug or feature?

[paul parasoft com (Paul Pluzhnikov)]

Gentlemen,

On all RH releases prior to the Phoebe, pthread_atfork is "exposed":

$ objdump -T /lib/i686/libpthread.so.0 | grep pthread_atfork
00007520 g    DF .text  000000ed  GLIBC_2.0   __pthread_atfork
00007520 g    DF .text  000000ed  GLIBC_2.0   pthread_atfork

On Phoebe (nptl-20021219.tar.bz2) pthread_atfork is hidden:

$ objdump -T /lib/i686/libpthread.so.0 | grep pthread_atfork
000067a0 g    DF .text  00000046 (GLIBC_2.0)  pthread_atfork

This is visible at the user level as the test case below demonstrates.
Is this a bug or a feature?

Thanks,
-- 
Paul Pluzhnikov		paul parasoft com

--- cut ---
/* compile with 
  gcc -D_GNU_SOURCE -g dlatfork.c -pthread -ldl
*/

#include <dlfcn.h>
#include <stdio.h>
#include <pthread.h>

int main(int argc, char *argv[])
{
    void *f = dlsym(RTLD_NEXT, "pthread_atfork");
    printf("&pthread_atfork = 0x%08x\n", &pthread_atfork);
    printf("dlsym(RTLD_NEXT, \"pthread_atfork\") = 0x%08x\n", f);
    return 0;
}
--- cut ---

## output on RH-8.0 ##
&pthread_atfork = 0x0804832c
dlsym(RTLD_NEXT, "pthread_atfork") = 0x4002d520


## output on Phoebe ##
&pthread_atfork = 0x0804832c
dlsym(RTLD_NEXT, "pthread_atfork") = 0x00000000