1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2021 iXsystems, Inc. 14 */ 15 16 /* 17 * FreeBSD and macOS expose file generation number through stat(2) and stat(1). 18 * Linux exposes it instead through an ioctl. 19 */ 20 21 #include <sys/ioctl.h> 22 #include <sys/fcntl.h> 23 #include <linux/fs.h> 24 #include <err.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <unistd.h> 28 29 int 30 main(int argc, const char * const argv[]) 31 { 32 if (argc != 2) 33 errx(EXIT_FAILURE, "usage: %s filename", argv[0]); 34 35 int fd = open(argv[1], O_RDONLY); 36 if (fd == -1) 37 err(EXIT_FAILURE, "failed to open %s", argv[1]); 38 39 int gen = 0; 40 if (ioctl(fd, FS_IOC_GETVERSION, &gen) == -1) 41 err(EXIT_FAILURE, "FS_IOC_GETVERSION failed"); 42 43 (void) close(fd); 44 45 (void) printf("%d\n", gen); 46 47 return (EXIT_SUCCESS); 48 } 49