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71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* fgetversion.c - Get a file version on an ext2 file system
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* fsetversion.c - Set a file version on an ext2 file system
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*
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*
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* Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
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* Laboratoire MASI, Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* This file can be redistributed under the terms of the GNU Library General
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* Public License
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*/
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/*
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* History:
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* 93/10/30 - Creation
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*/
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "e2p.h"
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#ifdef O_LARGEFILE
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#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE)
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#else
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#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK)
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#endif
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/*
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To do fsetversion: unsigned long *ptr_version must be set to NULL.
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and unsigned long version must be set to a value
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To do fgetversion: unsigned long *ptr_version must NOT be set to NULL
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and unsigned long version is ignored.
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TITO.
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*/
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int fgetsetversion (const char * name, unsigned long * get_version, unsigned long set_version)
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{
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#if HAVE_EXT2_IOCTLS
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int fd, r, ver, save_errno = 0;
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fd = open (name, OPEN_FLAGS);
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if (fd == -1)
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return -1;
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if (!get_version) {
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ver = (int) set_version;
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r = ioctl (fd, EXT2_IOC_SETVERSION, &ver);
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} else {
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r = ioctl (fd, EXT2_IOC_GETVERSION, &ver);
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*get_version = ver;
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}
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if (r == -1)
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save_errno = errno;
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close (fd);
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if (save_errno)
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errno = save_errno;
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return r;
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#else /* ! HAVE_EXT2_IOCTLS */
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errno = EOPNOTSUPP;
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return -1;
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#endif /* ! HAVE_EXT2_IOCTLS */
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}
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