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 * This file can be redistributed under the terms of the GNU Library General 9 * Public License 10 */ 11 12/* 13 * History: 14 * 93/10/30 - Creation 15 */ 16 17#define _LARGEFILE_SOURCE 18#define _LARGEFILE64_SOURCE 19 20#if HAVE_ERRNO_H 21#include <errno.h> 22#endif 23#if HAVE_UNISTD_H 24#include <unistd.h> 25#endif 26#include <fcntl.h> 27#include <sys/ioctl.h> 28 29#include "e2p.h" 30 31#ifdef O_LARGEFILE 32#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE) 33#else 34#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK) 35#endif 36 37int fgetversion (const char * name, unsigned long * version) 38{ 39#if HAVE_EXT2_IOCTLS 40#if !APPLE_DARWIN 41 int fd, r, ver, save_errno = 0; 42 43 fd = open (name, OPEN_FLAGS); 44 if (fd == -1) 45 return -1; 46 r = ioctl (fd, EXT2_IOC_GETVERSION, &ver); 47 if (r == -1) 48 save_errno = errno; 49 *version = ver; 50 close (fd); 51 if (save_errno) 52 errno = save_errno; 53 return r; 54#else 55 int ver=-1, err; 56 err = syscall(SYS_fsctl, name, EXT2_IOC_GETVERSION, &ver, 0); 57 *version = ver; 58 return(err); 59#endif 60#else /* ! HAVE_EXT2_IOCTLS */ 61 extern int errno; 62 errno = EOPNOTSUPP; 63 return -1; 64#endif /* ! HAVE_EXT2_IOCTLS */ 65} 66