pipe() syscall on ia64 (tiger) doesn't set errno to EMFILE

Can someone please tell me what is wrong with this:

/* expecting errno set to EMFILE but it isn't */

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int pipe_ret, pipes[2];

int main(int ac, char **av)
{
        int npipes;                     /* number of pipes opened */


                for (npipes = 0; ; npipes++) {
                        /*errno=-EMFILE;*/
                        pipe_ret = pipe(pipes);
                        /*printf(" errno = %d \n",errno);*/

                        if (pipe_ret < 0) {
                                printf("errno set to EMFILE  %d
\n",errno);
                                printf(" npipes = %d \n",npipes);
                                break;
                                }
                }

        return 0;
}

running it i get:
[root@cza pipe]# pipe12
errno set to EMFILE  0
 npipes = 510
[root@cza pipe]#

I think i should get, something like:
errno set to EMFILE  24
 npipes = 510


I currently have:
Red Hat Linux release 7.2 (Enigma)

Gnu C                  2.96
Gnu make               3.79.1
binutils               2.11.90.0.8
util-linux             2.11f
mount                  2.11g
modutils               2.4.10
e2fsprogs              1.23
reiserfsprogs          3.x.0j
Linux C Library        2.2.4
Dynamic linker (ldd)   2.2.4
Procps                 2.0.11
Net-tools              1.60
Console-tools          0.3.3
Sh-utils               2.0.11

/proc/cpuinfo
processor  : 0
vendor     : GenuineIntel
arch       : IA-64
family     : Itanium 2
...etc..

Linux version 2.5.64

thank you for your help,

 Jacky Malcles    	        Email : [email protected]
 Tel : 04.76.29.73.14