// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
 * Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

int main(int argc, char **argv)
{
	int fd;

	if (argc != 2) {
		fprintf(stderr, "Only two arguments: %s <fd>\n", argv[0]);
		exit(1);
	}

	fd = atoi(argv[1]);
	if (fcntl(fd, F_GETFL) < 0 && errno == EBADF)
		return 0;

	return 1;
}