1/* 2 * fgetversion.c - Get a file version on an ext2 file system 3 * 4 * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> 5 * Laboratoire MASI, Institut Blaise Pascal 6 * Universite Pierre et Marie Curie (Paris VI) 7 * 8 * %Begin-Header% 9 * This file may be redistributed under the terms of the GNU Library 10 * General Public License, version 2. 11 * %End-Header% 12 */ 13 14/* 15 * History: 16 * 93/10/30 - Creation 17 */ 18 19#define _LARGEFILE_SOURCE 20#define _LARGEFILE64_SOURCE 21 22#if HAVE_ERRNO_H 23#include <errno.h> 24#endif 25#if HAVE_UNISTD_H 26#include <unistd.h> 27#endif 28#include <fcntl.h> 29#include <sys/ioctl.h> 30 31#include "e2p.h" 32 33#ifdef O_LARGEFILE 34#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE) 35#else 36#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK) 37#endif 38 39int fgetversion (const char * name, unsigned long * version) 40{ 41#if HAVE_EXT2_IOCTLS 42#if !APPLE_DARWIN 43 int fd, r, ver, save_errno = 0; 44 45 fd = open (name, OPEN_FLAGS); 46 if (fd == -1) 47 return -1; 48 r = ioctl (fd, EXT2_IOC_GETVERSION, &ver); 49 if (r == -1) 50 save_errno = errno; 51 *version = ver; 52 close (fd); 53 if (save_errno) 54 errno = save_errno; 55 return r; 56#else 57 int ver=-1, err; 58 err = syscall(SYS_fsctl, name, EXT2_IOC_GETVERSION, &ver, 0); 59 *version = ver; 60 return(err); 61#endif 62#else /* ! HAVE_EXT2_IOCTLS */ 63 extern int errno; 64 errno = EOPNOTSUPP; 65 return -1; 66#endif /* ! HAVE_EXT2_IOCTLS */ 67} 68