how to stop dbus-daemon after posix_spawn fork?

edit

The posix_spawn arguments are a mystery to me, I use these, and could use advice, however, my real problem is this little server I have set up to spawn programs has worked flawlessly for years, but with fedora 22, it now spawns a dbus-daemon on every launch, which I then must clean up manually using the system-monitor.

How do I shut down the dbus-daemon when the the forked process closes, or, alternatively, how do I use a single dbus-daemon for the forked processes? dbus-daemon is also a mystery to me, fyi.

Note: the code sample provided was edited to remove my macros, & I hope it's translation to recognizable "C" is correct, but, its a standard fork.

Thanks Very much for all suggestions.

ons   
    pid_t pid; 
 /* signal( SIGCHLD, SIG_IGN );*/
    struct sigaction arg={ SIG_IGN, SA_NOCLDWAIT // never wait for a child. //( for direct termination of children )
    };
    sigaction( SIGCHLD, &arg, NULL );
    if( ( pid= fork() ) < 0 ) {
        yas( "fork failed\n" );
        exit( 1 );
    else  if (  pid== 0 ) {
        char buf[ 4096 ];
        getcwd( buf, 4096 );
        chdir( runDir );
        CHP spaArgs[] = { runCmd, runArgs, NULL };
        CHP spaEnv[] = { "USERNAME="
        ,  "USER=" 
        ,  "PATH=" 
        ,  "LD_LIBRARY_PATH=" 
        ,  "DISPLAY=:0" 
        ,  "DESKTOP_SESSION=gnome" 
        ,  "HOME=" 
        ,  "XAUTHORITY=/run/user/1000/gdm/Xauthority" 
        , NULL };

        YAS( "The Parent process id is" +IST( getpid() ) );

        INT err=posix_spawn( &pid, spaArgs[ 0 ], NULL, NULL, spaArgs, spaEnv );

        if( err )  YAZ( SIM( err ) ) ;
        exit( 0 );
    }
    int waitPIDerr= waitpid( pid, NULL, 0 /* WNOHANG */ );
    if( waitPIDerr )  YAZ( SIM( waitPIDerr ) );