int main()

in scripts/hypervisor.c [159:260]
91 lines of code
21 McCabe index (conditional complexity)

int main(int argc, char *argv[])
{
	int ssec = INTERVAL, ret, status;
	int first_start = 1;
	int pipefd[2], waited, alive, isdaemon;
	char buf[1024], info[4096];
	pid_t pid;
	time_t now, last = time(NULL);

	if((ret = parseopt(argc, argv)) < 0 )
		exit(ret);

	daemonize ? go_daemon() : 0;

	while(1){
		if(pipe(pipefd) < 0){
			fprintf(stderr, "- make pipe error : %s\n", strerror(errno));
			exit(-1);
		}

		if( (ret = set_nonblock(pipefd[0])) < 0 ){
			fprintf(stderr, "- set read nonblock error : %s\n", strerror(errno));
			exit(-1);
		}

		if((pid = fork()) < 0){
			fprintf(stderr, "- call fork() error : %s\n", strerror(errno));
			exit(-1);
		} else if (pid > 0){
			close(pipefd[1]);
			alive = waited = 1;
			isdaemon = 0;
			while(alive){
				if(waited){
					if(pid != waitpid(pid, &status, 0)){
						sleep(INTERVAL);
						continue;
					} else {
						fprintf(stderr, "- child process[%d] terminated .\n",pid);
						if (first_start && (time(NULL)-last)<=5) {
							fprintf(stderr,"- child process killed in %ld seconds , may wrong ! exit !\n",(time(NULL)-last));
							exit(-1);
						} else
							first_start = 0;
						waited = 0;
					}
				}

				ret = read(pipefd[0], buf, sizeof(buf));
				if(ret < 0){
					if(errno == EAGAIN){
						if(isdaemon == 0){
							fprintf(stderr, "- this daemon process has no output !.\n");
							isdaemon = 1;
						}
						sleep(INTERVAL);
						continue;
					} else {
						fprintf(stderr, "- read pipe error : %s\n", strerror(errno));
						exit(-1);
					}
				} else if(ret == 0) {
					alive = 0;
					close(pipefd[0]);
					fprintf(stderr, "- read zero from pipe of children.\n");
					if(isdaemon == 0){
						getstatus(info, sizeof(info), status);
						fprintf(stderr, "- extra info: %s\n", info);
					} else {
						strcpy(info, "");
					}
					continue;
				} else {
					fprintf(stderr, " - read pipe return: %d bytes\n", ret);
					exit(-1);
				}
			}

			fprintf(stderr, "- process: \"%s\" exit, restart it\n", cmd);

			sleep(ssec);

			now = time(NULL);
			if(now - last > 3600){
				ssec = INTERVAL;
				last = now;
			} else {
				ssec = (ssec << 1) < MAXINTERVAL ? (ssec << 1) : MAXINTERVAL;
			}
		} else {
			close(pipefd[0]);
			fprintf(stderr, "- execute: \"%s\"\n", cmd);
			if(execvp(cmd, cmdopt) < 0){
				fprintf(stderr, "- execute: \"%s\" error, %s\n", cmd, strerror(errno));
				exit(-1);
			}

		}
	}

	return 0;
}