common/syscall/pathconf.c

	pathconf.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 2003 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/cred.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/pathname.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/debug.h>

/*
 * Common code for pathconf(), fpathconf() system calls
 */
static long
cpathconf(register vnode_t *vp, int cmd, struct cred *cr)
{
    int error;
    ulong_t val;

    switch (cmd) {
    case _PC_2_SYMLINKS:
        if (error = VOP_PATHCONF(vp, _PC_SYMLINK_MAX, &val, cr))
            return ((long)set_errno(error));
        return ((long)(val > 0));

    case _PC_ALLOC_SIZE_MIN:
    case _PC_REC_INCR_XFER_SIZE:
    case _PC_REC_MAX_XFER_SIZE:
    case _PC_REC_MIN_XFER_SIZE:
    case _PC_REC_XFER_ALIGN:
        return ((long)set_errno(EINVAL));

    case _PC_ASYNC_IO:
        return (1l);

    case _PC_PRIO_IO:
        return ((long)set_errno(EINVAL));

    case _PC_SYNC_IO:
        if (!(error = VOP_FSYNC(vp, FSYNC, cr)))
            return (1l);
        return ((long)set_errno(error));

    case _PC_XATTR_ENABLED:
        return ((vp->v_vfsp->vfs_flag & VFS_XATTR) ? 1 : 0);

    default:
        if (error = VOP_PATHCONF(vp, cmd, &val, cr))
            return ((long)set_errno(error));
        return (val);
    }
    /* NOTREACHED */
}

/* fpathconf/pathconf interfaces */

long
fpathconf(int fdes, int name)
{
    file_t *fp;
    long retval;

    if ((fp = getf(fdes)) == NULL)
        return (set_errno(EBADF));
    retval = cpathconf(fp->f_vnode, name, fp->f_cred);
    releasef(fdes);
    return (retval);
}

long
pathconf(char *fname, int name)
{
    vnode_t *vp;
    long    retval;
    int error;

lookup:
    if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
        if (error == ESTALE)
            goto lookup;
        return ((long)set_errno(error));
    }

    retval = cpathconf(vp, name, CRED());
    VN_RELE(vp);
    return (retval);
}