run_program
auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);
ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL);
ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done, NULL);
rpid = run_program(argv[0], argv, 0, NULL, NULL);
extern pid_t run_program __P((char *prog, char **args, int must_exist,