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
fgetversion(const char * name,unsigned long * version)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