paul@181 | 1 | /* |
paul@181 | 2 | * fgetversion.c - Get a file version on an ext2 file system |
paul@181 | 3 | * |
paul@181 | 4 | * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> |
paul@181 | 5 | * Laboratoire MASI, Institut Blaise Pascal |
paul@181 | 6 | * Universite Pierre et Marie Curie (Paris VI) |
paul@181 | 7 | * |
paul@181 | 8 | * %Begin-Header% |
paul@181 | 9 | * This file may be redistributed under the terms of the GNU Library |
paul@181 | 10 | * General Public License, version 2. |
paul@181 | 11 | * %End-Header% |
paul@181 | 12 | */ |
paul@181 | 13 | |
paul@181 | 14 | /* |
paul@181 | 15 | * History: |
paul@181 | 16 | * 93/10/30 - Creation |
paul@181 | 17 | */ |
paul@181 | 18 | |
paul@181 | 19 | #ifndef _LARGEFILE_SOURCE |
paul@181 | 20 | #define _LARGEFILE_SOURCE |
paul@181 | 21 | #endif |
paul@181 | 22 | #ifndef _LARGEFILE64_SOURCE |
paul@181 | 23 | #define _LARGEFILE64_SOURCE |
paul@181 | 24 | #endif |
paul@181 | 25 | |
paul@181 | 26 | #include "config.h" |
paul@181 | 27 | #if HAVE_ERRNO_H |
paul@181 | 28 | #include <errno.h> |
paul@181 | 29 | #endif |
paul@181 | 30 | #if HAVE_UNISTD_H |
paul@181 | 31 | #include <unistd.h> |
paul@181 | 32 | #endif |
paul@181 | 33 | #include <fcntl.h> |
paul@181 | 34 | #if HAVE_SYS_IOCTL_H |
paul@181 | 35 | #include <sys/ioctl.h> |
paul@181 | 36 | #endif |
paul@181 | 37 | |
paul@181 | 38 | #include "e2p.h" |
paul@181 | 39 | |
paul@181 | 40 | #ifdef O_LARGEFILE |
paul@181 | 41 | #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE) |
paul@181 | 42 | #else |
paul@181 | 43 | #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK) |
paul@181 | 44 | #endif |
paul@181 | 45 | |
paul@181 | 46 | int fgetversion(const char *name, unsigned long *version) |
paul@181 | 47 | { |
paul@181 | 48 | unsigned int ver = -1; |
paul@181 | 49 | int rc = -1; |
paul@181 | 50 | #if HAVE_EXT2_IOCTLS |
paul@181 | 51 | # if !APPLE_DARWIN |
paul@181 | 52 | int fd, save_errno = 0; |
paul@181 | 53 | |
paul@181 | 54 | fd = open(name, OPEN_FLAGS); |
paul@181 | 55 | if (fd == -1) |
paul@181 | 56 | return -1; |
paul@181 | 57 | |
paul@181 | 58 | rc = ioctl(fd, EXT2_IOC_GETVERSION, &ver); |
paul@181 | 59 | if (rc == -1) |
paul@181 | 60 | save_errno = errno; |
paul@181 | 61 | close(fd); |
paul@181 | 62 | if (rc == -1) |
paul@181 | 63 | errno = save_errno; |
paul@181 | 64 | # else /* APPLE_DARWIN */ |
paul@181 | 65 | rc = syscall(SYS_fsctl, name, EXT2_IOC_GETVERSION, &ver, 0); |
paul@181 | 66 | # endif /* !APPLE_DARWIN */ |
paul@181 | 67 | #else /* ! HAVE_EXT2_IOCTLS */ |
paul@181 | 68 | extern int errno; |
paul@181 | 69 | |
paul@181 | 70 | errno = EOPNOTSUPP; |
paul@181 | 71 | #endif /* ! HAVE_EXT2_IOCTLS */ |
paul@181 | 72 | if (rc == 0) |
paul@181 | 73 | *version = ver; |
paul@181 | 74 | |
paul@181 | 75 | return rc; |
paul@181 | 76 | } |