147             close(1);

   147             close(1);

   148             dup(read_pipe[1]);

   148             dup(read_pipe[1]);

   149             close(read_pipe[1]);

   149             close(read_pipe[1]);

   150             close(read_pipe[0]);

   150             close(read_pipe[0]);

   151             execl(filter_par, filter_par, 0);

   151             execl(filter_par, filter_par, 0);

   153             exit(-1);

   153             exit(-1);

   154             break;

   154             break;

   155         case -1:

   155         case -1:

   156             perror("fork");

   156             perror("fork");

   157             exit(-1);

   157             exit(-1);