[Bug c/11586] New: after call sigaction

["weikun at caltech dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11586

           Summary: after call sigaction
           Product: gcc
           Version: 3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: weikun at caltech dot edu
                CC: gcc-bugs at gcc dot gnu dot org

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

It happens since RH9, and it works fine before with all the previous verion 
RedHat.

> #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);
> }
>