/*
 * Compile:
 *   cc -m32 test.c -o test
 *
 * Prepare testfile:
 *   fallocate -l 4294967297 large-file
 *
 * Test:
 *   ./test large-file
 *
 * Result:
 *   Correct: open() fails, exit code 2
 *   Incorrect: Prints an incorrect file size
 *
 * Observation:
 *   Correct on ext4/btrfs
 *   Incorrect on NFS/tmpfs
 */

#include <assert.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

static_assert(sizeof(void *) == 4, "This test only makes sense on 32bit");
static_assert(sizeof(off_t) == 4, "Large file support has to be disabled");

int main(int argc, char **argv)
{
	if (argc != 2)
		return 1;
	int fd = open(argv[1], O_RDONLY);
	if (fd == -1)
		return 2;
	off_t fsize = lseek(fd, 0, SEEK_END);
	printf("file size=%lu\n", fsize);
}