kernel/syscall/resolvepath.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 #ident  "%Z%%M% %I%     %E% SMI"
  23
  24 /*
  25  * Copyright 1997 by Sun Microsystems, Inc.
  26  * All rights reserved.
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/types.h>
  31 #include <sys/systm.h>
  32 #include <sys/errno.h>
  33 #include <sys/pathname.h>
  34
  35 int
  36 resolvepath(char *path, char *buf, size_t count)
  37 {
  38         struct pathname lookpn;
  39         struct pathname resolvepn;
  40         int error;
  41
  42         if (count == 0)
  43                 return (0);
  44         if (error = pn_get(path, UIO_USERSPACE, &lookpn))
  45                 return (set_errno(error));
  46         pn_alloc(&resolvepn);
  47         error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULL, NULL);
  48         if (error == 0) {
  49                 if (count > resolvepn.pn_pathlen)
  50                         count = resolvepn.pn_pathlen;
  51                 if (copyout(resolvepn.pn_path, buf, count))
  52                         error = EFAULT;
  53         }
  54         pn_free(&resolvepn);
  55         pn_free(&lookpn);
  56
  57         if (error)
  58                 return (set_errno(error));
  59         return ((int)count);
  60 }