common/syscall/utime.c

	utime.c revision c4d3e299d9d0295322679b4d484560411b6822d5
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*  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.
 */

#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/time.h>
#include <sys/debug.h>
#include <sys/model.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/pathname.h>
#include <c2/audit.h>

static int
cfutimesat(int fd, char *fname, int nmflag, vattr_t *vap, int flags, int follow)
{
    file_t *fp;
    vnode_t *startvp, *vp;
    int error;
    char startchar;

    if (fd == AT_FDCWD && fname == NULL)
        return (set_errno(EFAULT));

    if (nmflag == 1 || (nmflag == 2 && fname != NULL)) {
        if (copyin(fname, &startchar, sizeof (char)))
            return (set_errno(EFAULT));
    } else {
        startchar = '\0';
    }

    if (fd == AT_FDCWD) {
        startvp = NULL;
    } else {
        /*
         * is this absolute path?
         */
        if (startchar != '/') {
            if ((fp = getf(fd)) == NULL)
                return (set_errno(EBADF));
            startvp = fp->f_vnode;
            VN_HOLD(startvp);
            releasef(fd);
        } else {
            startvp = NULL;
        }
    }

    if (AU_AUDITING() && (startvp != NULL))
        audit_setfsat_path(1);

    if ((nmflag == 1) || ((nmflag == 2) && (fname != NULL))) {
        if ((error = lookupnameat(fname, UIO_USERSPACE,
            follow, NULLVPP, &vp, startvp)) != 0) {
            if (startvp != NULL)
                VN_RELE(startvp);
            return (set_errno(error));
        }
    } else {
        vp = startvp;
        VN_HOLD(vp);
    }

    if (startvp != NULL) {
        VN_RELE(startvp);
    }

    if (vn_is_readonly(vp)) {
        error = EROFS;
    } else {
        error = VOP_SETATTR(vp, vap, flags, CRED(), NULL);
    }

    VN_RELE(vp);
    if (error != 0)
        return (set_errno(error));
    return (0);
}

static int
get_timespec_vattr(timespec_t *tsptr, struct vattr *vattr, int *flags)
{
    timespec_t ts[2];
    timespec_t now;
    uint_t mask;

    if (tsptr != NULL) {
        if (get_udatamodel() == DATAMODEL_NATIVE) {
            if (copyin(tsptr, ts, sizeof (ts)))
                return (EFAULT);
        } else {
            timespec32_t ts32[2];

            if (copyin(tsptr, ts32, sizeof (ts32)))
                return (EFAULT);
            TIMESPEC32_TO_TIMESPEC(&ts[0], &ts32[0]);
            TIMESPEC32_TO_TIMESPEC(&ts[1], &ts32[1]);
        }
        if (ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW)
            gethrestime(&now);
        mask = 0;
        if (ts[0].tv_nsec == UTIME_OMIT) {
            ts[0].tv_nsec = 0;
        } else {
            mask |= AT_ATIME;
            if (ts[0].tv_nsec == UTIME_NOW)
                ts[0] = now;
            else if (ts[0].tv_nsec < 0 || ts[0].tv_nsec >= NANOSEC)
                return (EINVAL);
        }
        if (ts[1].tv_nsec == UTIME_OMIT) {
            ts[1].tv_nsec = 0;
        } else {
            mask |= AT_MTIME;
            if (ts[1].tv_nsec == UTIME_NOW)
                ts[1] = now;
            else if (ts[1].tv_nsec < 0 || ts[1].tv_nsec >= NANOSEC)
                return (EINVAL);
        }
        vattr->va_atime = ts[0];
        vattr->va_mtime = ts[1];
        vattr->va_mask = mask;
        *flags = ATTR_UTIME;
    } else {
        gethrestime(&now);
        vattr->va_atime = now;
        vattr->va_mtime = now;
        vattr->va_mask = AT_ATIME | AT_MTIME;
        *flags = 0;
    }

    return (0);
}

int
futimens(int fd, timespec_t *tsptr)
{
    struct vattr vattr;
    int flags;
    int error;

    if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
        return (set_errno(error));

    return (cfutimesat(fd, NULL, 2, &vattr, flags, FOLLOW));
}

int
utimensat(int fd, char *fname, timespec_t *tsptr, int flag)
{
    struct vattr vattr;
    int flags;
    int error;

    if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
        return (set_errno(error));

    return (cfutimesat(fd, fname, 1, &vattr, flags,
        (flag & AT_SYMLINK_NOFOLLOW)? NO_FOLLOW : FOLLOW));
}

int
utimesys(int code,
    uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
{
    switch (code) {
    case 0:
        return (futimens((int)arg1, (timespec_t *)arg2));
    case 1:
        return (utimensat((int)arg1, (char *)arg2,
            (timespec_t *)arg3, (int)arg4));
    default:
        return (set_errno(EINVAL));
    }
}