1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * This file and its contents are supplied under the terms of the 4 * Common Development and Distribution License ("CDDL"), version 1.0. 5 * You may only use this file in accordance with the terms of version 6 * 1.0 of the CDDL. 7 * 8 * A full copy of the text of the CDDL should have accompanied this 9 * source. A copy of the CDDL is also available via the Internet at 10 * http://www.illumos.org/license/CDDL. 11 */ 12 13 /* 14 * Copyright 2021 iXsystems, Inc. 15 */ 16 17 /* 18 * FreeBSD and macOS expose file generation number through stat(2) and stat(1). 19 * Linux exposes it instead through an ioctl. 20 */ 21 22 #include <sys/ioctl.h> 23 #ifdef _KERNEL 24 #include <sys/fcntl.h> 25 #else 26 #include <fcntl.h> 27 #endif 28 #include <linux/fs.h> 29 #include <err.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <unistd.h> 33 34 int 35 main(int argc, const char * const argv[]) 36 { 37 if (argc != 2) 38 errx(EXIT_FAILURE, "usage: %s filename", argv[0]); 39 40 int fd = open(argv[1], O_RDONLY); 41 if (fd == -1) 42 err(EXIT_FAILURE, "failed to open %s", argv[1]); 43 44 int gen = 0; 45 if (ioctl(fd, FS_IOC_GETVERSION, &gen) == -1) 46 err(EXIT_FAILURE, "FS_IOC_GETVERSION failed"); 47 48 (void) close(fd); 49 50 (void) printf("%d\n", gen); 51 52 return (EXIT_SUCCESS); 53 } 54