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 * %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 #ifndef _LARGEFILE_SOURCE 20 #define _LARGEFILE_SOURCE 21 #endif 22 #ifndef _LARGEFILE64_SOURCE 23 #define _LARGEFILE64_SOURCE 24 #endif 25 26 #include "config.h" 27 #if HAVE_ERRNO_H 28 #include <errno.h> 29 #endif 30 #if HAVE_UNISTD_H 31 #include <unistd.h> 32 #endif 33 #include <fcntl.h> 34 #if HAVE_SYS_IOCTL_H 35 #include <sys/ioctl.h> 36 #endif 37 38 #include "e2p.h" 39 40 #ifdef O_LARGEFILE 41 #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE) 42 #else 43 #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK) 44 #endif 45 46 int fgetversion(const char *name, unsigned long *version) 47 { 48 unsigned int ver = -1; 49 int rc = -1; 50 #if HAVE_EXT2_IOCTLS 51 # if !APPLE_DARWIN 52 int fd, save_errno = 0; 53 54 fd = open(name, OPEN_FLAGS); 55 if (fd == -1) 56 return -1; 57 58 rc = ioctl(fd, EXT2_IOC_GETVERSION, &ver); 59 if (rc == -1) 60 save_errno = errno; 61 close(fd); 62 if (rc == -1) 63 errno = save_errno; 64 # else /* APPLE_DARWIN */ 65 rc = syscall(SYS_fsctl, name, EXT2_IOC_GETVERSION, &ver, 0); 66 # endif /* !APPLE_DARWIN */ 67 #else /* ! HAVE_EXT2_IOCTLS */ 68 extern int errno; 69 70 errno = EOPNOTSUPP; 71 #endif /* ! HAVE_EXT2_IOCTLS */ 72 if (rc == 0) 73 *version = ver; 74 75 return rc; 76 } 77
