usr/src/cmd/fs.d/autofs/auto_mnttab.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 /*
  23  *      auto_mnttab.c
  24  *
  25  *      Copyright (c) 1988-1999 Sun Microsystems Inc
  26  *      All Rights Reserved.
  27  */
  28
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <stdio.h>
  32 #include <sys/mnttab.h>
  33 #include <sys/mkdev.h>
  34 #include "automount.h"
  35
  36 static mutex_t mnttab_lock = DEFAULTMUTEX;
  37
  38 /*
  39  * XXX - Serialize calls to fsgetmntlist, so that threads can get consistent
  40  * snapshots of the in-kernel mnttab.  This function should be removed
  41  * once getextmntent is made MT-safe and callers can invoke fsgetmntlist
  42  * directly.
  43  */
  44 struct mntlist *
  45 getmntlist()
  46 {
  47         struct mntlist *mntl;
  48
  49         (void) mutex_lock(&mnttab_lock);
  50         mntl = fsgetmntlist();
  51         (void) mutex_unlock(&mnttab_lock);
  52         return (mntl);
  53 }
  54
  55 /*
  56  * Return device number from extmnttab struct
  57  */
  58 dev_t
  59 get_devid(mnt)
  60         struct extmnttab *mnt;
  61 {
  62         return (makedev(mnt->mnt_major, mnt->mnt_minor));
  63 }