system() return different value under 2.4.23 and 2.6.0-test11

[fengxj <fengxiangjun@neusoft.com>]

Hi, everyone

I just found a simple program:

-----------------------------
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

int main(void)
{
        int ret;

        signal(SIGCHLD, SIG_IGN);

        ret = system("/bin/date 1>/dev/null");
        printf("%d\n", ret);

        return 0;
}
----------------------------

runs under 2.4.23 with ret = 0,
but under 2.6.0-test11, ret = -1.

Why?

And when i remove 
    signal(...)
it returns the same value 0. 

I use Slackware 9.1 with GCC 3.2.3 and libc 2.3.2


Regards.