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/*
* fgetversion.c - Get a file version on an ext2 file system
* fsetversion.c - Set a file version on an ext2 file system
*
*
* Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
* Laboratoire MASI, Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* This file can be redistributed under the terms of the GNU Library General
* Public License
*/
/*
* History:
* 93/10/30 - Creation
*/
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/ioctl.h>
#include "e2p.h"
#ifdef O_LARGEFILE
#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE)
#else
#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK)
#endif
/*
To do fsetversion: unsigned long *ptr_version must be set to NULL.
and unsigned long version must be set to a value
To do fgetversion: unsigned long *ptr_version must NOT be set to NULL
and unsigned long version is ignored.
TITO.
*/
int fgetsetversion (const char * name, unsigned long * get_version, unsigned long set_version)
{
#if HAVE_EXT2_IOCTLS
int fd, r, ver, save_errno = 0;
fd = open (name, OPEN_FLAGS);
if (fd == -1)
return -1;
if (!get_version) {
ver = (int) set_version;
r = ioctl (fd, EXT2_IOC_SETVERSION, &ver);
} else {
r = ioctl (fd, EXT2_IOC_GETVERSION, &ver);
*get_version = ver;
}
if (r == -1)
save_errno = errno;
close (fd);
if (save_errno)
errno = save_errno;
return r;
#else /* ! HAVE_EXT2_IOCTLS */
errno = EOPNOTSUPP;
return -1;
#endif /* ! HAVE_EXT2_IOCTLS */
}
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