#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
	int status;
	int num = 2;
	int cnt = 0;
	if (argc > 1) num = atoi(argv[1]);
	while (1) {
		for (int i=0; i<num; i++)
			if (fork() == 0) {
				execl("/usr/bin/sleep", "sleep", "0.1", NULL);
			}
		for (int i=0; i<num; i++) {
			waitpid(-1, &status, 0);
			if (WEXITSTATUS(status)) {
				printf("%d: %d\n", num, WEXITSTATUS(status));
				return 1;
			}
		}
	}
	return 0;
}