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