#include <tools.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>

char *file = "/larder/file/file0";
int fd;
int size = 1*G;
char *ptr = 0;

int foo(void)
{
#define N 50
	int pos = random() % size, i;
	char core[N];
	int t;
	volatile char x __attribute__ ((unused));

	t = mincore(&ptr[pos-4096*8], 4096*N, core);
	printf("-%d ", t);
	for (i = 0; i < N; i++) printf("%s%c", i%8?"":" ", core[i] ? '0' : '-');
	printf("\n");

	x = ptr[pos];
	x = ptr[pos+4096*24];

	t = mincore(&ptr[pos-4096*8], 4096*N, core);
	printf("+%d ", t);
	for (i = 0; i < N; i++) printf("%s%c", i%8?"":" ", core[i] ? '0' : '-');
	printf("\n");

	return pos;
}

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

	fd = open(file, O_RDONLY);
	unless (fd >= 0) die("open");
	ptr = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
	unless (ptr) die("mmap");
	srandom(time(0)+getpid());

	for (i = 0; i < 10; i++)
		foo();
	return 0;
}