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