#define _LARGEFILE64_SOURCE
#include <assert.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/resource.h>

#include <linux/types.h>
#include <linux/unistd.h>
#include <linux/dirent.h>
_syscall3(int, getdents, uint, fd, struct dirent *, dirp, uint, count);
 
void try(const char *what, int err)
{
	if (!err)
		return;
	fprintf (stderr, "Unexpected result %d.  %s: %s\n",
		 err, what, strerror(errno));
	exit(1);
}

int test_readdir(int fd)
{
	loff_t offset;
	char dirbuf[4096];
	int res;

	offset = lseek64(fd, 0, SEEK_CUR);
	res = getdents(fd, (struct dirent *)dirbuf, sizeof(dirbuf));
	printf("getdents at f_pos %#016llX returned %d.\n", offset, res);
	return res;
}

int main()
{
	int fd;
	int res;
	loff_t offset;
	
	fd = open64(".", O_RDONLY, 0);
	try ("open \".\"", fd < 0);

	do {
		res = test_readdir(fd);
	} while (res > 0);

	offset = lseek64(fd, 0, SEEK_CUR);
	printf("Final f_pos is %#016llX.\n", offset);
	return 0;
}