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 * %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 #include <sys/ioctl.h>
35
36 #include "e2p.h"
37
38 #ifdef O_LARGEFILE
39 #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE)
40 #else
41 #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK)
42 #endif
43
fgetversion(const char * name,unsigned long * version)44 int fgetversion(const char *name, unsigned long *version)
45 {
46 unsigned int ver = -1;
47 int rc = -1;
48 #if HAVE_EXT2_IOCTLS
49 # if !APPLE_DARWIN
50 int fd, save_errno = 0;
51
52 fd = open(name, OPEN_FLAGS);
53 if (fd == -1)
54 return -1;
55
56 rc = ioctl(fd, EXT2_IOC_GETVERSION, &ver);
57 if (rc == -1)
58 save_errno = errno;
59 close(fd);
60 if (rc == -1)
61 errno = save_errno;
62 # else /* APPLE_DARWIN */
63 rc = syscall(SYS_fsctl, name, EXT2_IOC_GETVERSION, &ver, 0);
64 # endif /* !APPLE_DARWIN */
65 #else /* ! HAVE_EXT2_IOCTLS */
66 extern int errno;
67
68 errno = EOPNOTSUPP;
69 #endif /* ! HAVE_EXT2_IOCTLS */
70 if (rc == 0)
71 *version = ver;
72
73 return rc;
74 }
75