#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/mman.h>

int
main(int argc, char *argv[])
{
	void *map;

	map = mmap(NULL, 4096, PROT_WRITE|PROT_READ, MAP_SHARED|MAP_ANON, -1, 0);
	if (map == (void *)MAP_FAILED && errno) {
		perror("mmap");
		exit(1);
	}

	if (mprotect(map, 4096, PROT_EXEC)) {
		perror("mprotect");
		exit(1);
	}

	return (0);
}