1/* vi: set sw=4 ts=4: */ 2/* 3 * fgetversion.c - Get a file version on an ext2 file system 4 * fsetversion.c - Set a file version on an ext2 file system 5 * 6 * 7 * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> 8 * Laboratoire MASI, Institut Blaise Pascal 9 * Universite Pierre et Marie Curie (Paris VI) 10 * 11 * This file can be redistributed under the terms of the GNU Library General 12 * Public License 13 */ 14 15/* 16 * History: 17 * 93/10/30 - Creation 18 */ 19 20#ifdef HAVE_ERRNO_H 21#include <errno.h> 22#endif 23#ifdef 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 37/* 38 To do fsetversion: unsigned long *ptr_version must be set to NULL. 39 and unsigned long version must be set to a value 40 To do fgetversion: unsigned long *ptr_version must NOT be set to NULL 41 and unsigned long version is ignored. 42 TITO. 43*/ 44 45int fgetsetversion (const char * name, unsigned long * get_version, unsigned long set_version) 46{ 47#ifdef HAVE_EXT2_IOCTLS 48 int fd, r, ver, save_errno = 0; 49 50 fd = open (name, OPEN_FLAGS); 51 if (fd == -1) 52 return -1; 53 if (!get_version) { 54 ver = (int) set_version; 55 r = ioctl (fd, EXT2_IOC_SETVERSION, &ver); 56 } else { 57 r = ioctl (fd, EXT2_IOC_GETVERSION, &ver); 58 *get_version = ver; 59 } 60 if (r == -1) 61 save_errno = errno; 62 close (fd); 63 if (save_errno) 64 errno = save_errno; 65 return r; 66#else /* ! HAVE_EXT2_IOCTLS */ 67 errno = EOPNOTSUPP; 68 return -1; 69#endif /* ! HAVE_EXT2_IOCTLS */ 70} 71