gcc 3 problem on sigaction and system

[Kun Wei <weikun at caltech dot edu>]

Hi;
I notice since gcc 3, the return value of system() doesn't work
correctly. The following code will return 0 or -1 randomly, please help
me how to solve this problem because I need to check if return value is
-1 to make sure  system call is fine or not.

#include <signal.h>

main()
{
        struct sigaction v_sig;

        #if !defined(linux)
                v_sig.sa_flags =  SA_NOCLDWAIT;
        #else
                v_sig.sa_handler = SIG_IGN;
        #endif

        sigaction(SIGCHLD, &v_sig, 0);

        printf("return %d\n", system("ls -l > /dev/null"));

        return (0);
}

Thanks a lot
Kun