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

int main()
{
	int cnt_success = 0, cnt_failure = 0;
	int status;

	void *addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
			  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	if (addr == MAP_FAILED) {
		perror("mmap failed");
		exit(1);
	}
	if (mprotect(addr, 4096, PROT_READ | PROT_WRITE | PROT_EXEC) == -1) {
		perror("mprotect failed");
		exit(1);
	}
	if (madvise(addr, 4096, MADV_DONTFORK) == -1) {
		perror("madvise failed");
		exit(1);
	}
	printf("VMA created at address %p\n", addr);

	for (int i = 0; i < 10000; i++) {
		pid_t pid = fork();
		if (pid == -1) {
			cnt_failure++;
		} else if (pid == 0) {
			exit(EXIT_SUCCESS);
		} else {
			cnt_success++;
			wait(&status);
			if (status != 0) {
				fprintf(stderr, "Bad wait status: 0x%x\n",
					status);
				exit(2);
			}
		}
	}

	printf("success:%d failure:%d\n", cnt_success, cnt_failure);
	return 0;
}