LXR busybox/e2fsprogs/old_e2fsprogs/e2p/fgetsetversion.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * fgetversion.c        - Get a file version on an ext2 file system
   4 * fsetversion.c        - Set a file version on an ext2 file system
   5 *
   6 *
   7 * Copyright (C) 1993, 1994  Remy Card <card@masi.ibp.fr>
   8 *                           Laboratoire MASI, Institut Blaise Pascal
   9 *                           Universite Pierre et Marie Curie (Paris VI)
  10 *
  11 * This file can be redistributed under the terms of the GNU Library General
  12 * Public License
  13 */
  14
  15/*
  16 * History:
  17 * 93/10/30     - Creation
  18 */
  19
  20#ifdef HAVE_ERRNO_H
  21#include <errno.h>
  22#endif
  23#ifdef 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
  37/*
  38   To do fsetversion:     unsigned long *ptr_version must be set to NULL.
  39                      and unsigned long version must be set to a value
  40   To do fgetversion:     unsigned long *ptr_version must NOT be set to NULL
  41                      and unsigned long version is ignored.
  42        TITO.
  43*/
  44
  45int fgetsetversion (const char * name, unsigned long * get_version, unsigned long set_version)
  46{
  47#ifdef HAVE_EXT2_IOCTLS
  48        int fd, r, ver, save_errno = 0;
  49
  50        fd = open (name, OPEN_FLAGS);
  51        if (fd == -1)
  52                return -1;
  53        if (!get_version) {
  54                ver = (int) set_version;
  55                r = ioctl (fd, EXT2_IOC_SETVERSION, &ver);
  56        } else {
  57                r = ioctl (fd, EXT2_IOC_GETVERSION, &ver);
  58                *get_version = ver;
  59        }
  60        if (r == -1)
  61                save_errno = errno;
  62        close (fd);
  63        if (save_errno)
  64                errno = save_errno;
  65        return r;
  66#else /* ! HAVE_EXT2_IOCTLS */
  67        errno = EOPNOTSUPP;
  68        return -1;
  69#endif /* ! HAVE_EXT2_IOCTLS */
  70}
  71