24 static pid_t pid = -1;  variable
29     if (pid <= 0) return;  in signal_handler()
38     kill(pid, sig);  in signal_handler()
68         if (-1 == pid) {  in main()
69             pid = fork();  in main()
70             if (-1 == pid) return -1;  in main()
71             if (0 == pid) {  in main()
80         if ((pid_t)-1 == waitpid(pid, &exitcode, 0)) {  in main()
98             fprintf(stderr, msg, __FILE__, __LINE__, pid, code);  in main()
100         pid = restart; /* -1 for restart, 0 to exit */  in main()
103     } while (pid != 0);  in main()