1 /* 2 * fgetversion.c - Get a file version on an ext2 file system 3 * 4 * Copyright (C) 1993, 1994 Remy Card <card (at) 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 37 int 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
