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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2021 iXsystems, Inc.
*/
/*
* FreeBSD and macOS expose file generation number through stat(2) and stat(1).
* Linux exposes it instead through an ioctl.
*/
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <linux/fs.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, const char * const argv[])
{
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s filename", argv[0]);
int fd = open(argv[1], O_RDONLY);
if (fd == -1)
err(EXIT_FAILURE, "failed to open %s", argv[1]);
int gen = 0;
if (ioctl(fd, FS_IOC_GETVERSION, &gen) == -1)
err(EXIT_FAILURE, "FS_IOC_GETVERSION failed");
(void) close(fd);
(void) printf("%d\n", gen);
return (EXIT_SUCCESS);
}
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