common/syscall/rename.c

	rename.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/debug.h>
#include <sys/file.h>
#include <sys/fcntl.h>

/*
 * Rename or move an existing file.
 */
int
rename(char *from, char *to)
{
    int error;

    if (error = vn_rename(from, to, UIO_USERSPACE))
        return (set_errno(error));
    return (0);
}

/*
 * Rename a file relative to a given directory
 */
int
renameat(int fromfd, char *old, int tofd, char *new)
{
    file_t *fromfp;
    file_t *tofp;
    vnode_t *fromvp, *tovp;
    int error;
    proc_t *p = curproc;
    char oldstart, newstart;

    tovp = fromvp = NULL;

    if ((fromfd == AT_FDCWD && old == NULL) ||
        (tofd == AT_FDCWD && new == NULL))
        return (set_errno(EFAULT));

    if (fromfd == AT_FDCWD || tofd == AT_FDCWD) {
        mutex_enter(&p->p_lock);
        if (fromfd == AT_FDCWD) {
            fromvp = PTOU(p)->u_cdir;
            VN_HOLD(fromvp);
        }
        if (tofd == AT_FDCWD) {
            tovp = PTOU(p)->u_cdir;
            VN_HOLD(tovp);
        }
        mutex_exit(&p->p_lock);
    }

    if (copyin(old, &oldstart, sizeof (char)))
        return (set_errno(EFAULT));

    if (copyin(new, &newstart, sizeof (char)))
        return (set_errno(EFAULT));

    if (fromvp == NULL) {
        if (oldstart != '/') {
            if ((fromfp = getf(fromfd)) == NULL) {
                if (tovp != NULL)
                    VN_RELE(tovp);
                return (set_errno(EBADF));
            }
            fromvp = fromfp->f_vnode;
            VN_HOLD(fromvp);
            releasef(fromfd);
        } else {
            fromvp = NULL;
        }
    }

    if (tovp == NULL) {
        if (newstart != '/') {
            if ((tofp = getf(tofd)) == NULL) {
                if (fromvp != NULL)
                    VN_RELE(fromvp);
                return (set_errno(EBADF));
            }
            tovp = tofp->f_vnode;
            VN_HOLD(tovp);
            releasef(tofd);
        } else {
            tovp = NULL;
        }
    }

    error = vn_renameat(fromvp, old, tovp, new, UIO_USERSPACE);

    if (fromvp != NULL)
        VN_RELE(fromvp);
    if (tovp != NULL)
        VN_RELE(tovp);
    if (error != 0)
        return (set_errno(error));
    return (error);
}