usr/src/lib/libc/port/sys/sharefs.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "lint.h"
  30 #include <sys/types.h>
  31 #include <sys/types32.h>
  32 #include <rpc/types.h>
  33 #include <sys/vfs.h>
  34 #include <strings.h>
  35 #include <sharefs/share.h>
  36 #include <sys/syscall.h>
  37
  38 #include "libc.h"
  39
  40 #define SMAX(i, j)              \
  41         if ((j) > (i)) {        \
  42                 (i) = (j);      \
  43         }
  44
  45 int
  46 _sharefs(enum sharefs_sys_op opcode, struct share *sh)
  47 {
  48         uint32_t                i, j;
  49
  50         /*
  51          * We need to know the total size of the share
  52          * and also the largest element size. This is to
  53          * get enough buffer space to transfer from
  54          * userland to kernel.
  55          */
  56         i = (sh->sh_path ? strlen(sh->sh_path) : 0);
  57         sh->sh_size = i;
  58
  59         j = (sh->sh_res ? strlen(sh->sh_res) : 0);
  60         sh->sh_size += j;
  61         SMAX(i, j);
  62
  63         j = (sh->sh_fstype ? strlen(sh->sh_fstype) : 0);
  64         sh->sh_size += j;
  65         SMAX(i, j);
  66
  67         j = (sh->sh_opts ? strlen(sh->sh_opts) : 0);
  68         sh->sh_size += j;
  69         SMAX(i, j);
  70
  71         j = (sh->sh_descr ? strlen(sh->sh_descr) : 0);
  72         sh->sh_size += j;
  73         SMAX(i, j);
  74
  75         return (syscall(SYS_sharefs, opcode, sh, i));
  76 }