gen.subproj/getvfsbyname.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1995
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55 #include <sys/param.h>
  56 #include <sys/mount.h>
  57 #include <sys/sysctl.h>
  58 #include <errno.h>
  59 #include <kvm.h>
  60
  61 int getvfsbyname __P((const char *, struct vfsconf *));
  62
  63 /*
  64  * Given a filesystem name, determine if it is resident in the kernel,
  65  * and if it is resident, return its vfsconf structure.
  66  */
  67 getvfsbyname(fsname, vfcp)
  68         const char *fsname;
  69         struct vfsconf *vfcp;
  70 {
  71         int name[4], maxtypenum, cnt;
  72         size_t buflen;
  73
  74         name[0] = CTL_VFS;
  75         name[1] = VFS_GENERIC;
  76         name[2] = VFS_MAXTYPENUM;
  77         buflen = 4;
  78         if (sysctl(name, 3, &maxtypenum, &buflen, (void *)0, (size_t)0) < 0)
  79                 return (-1);
  80         name[2] = VFS_CONF;
  81         buflen = sizeof *vfcp;
  82         for (cnt = 0; cnt < maxtypenum; cnt++) {
  83                 name[3] = cnt;
  84                 if (sysctl(name, 4, vfcp, &buflen, (void *)0, (size_t)0) < 0) {
  85                         if (errno != EOPNOTSUPP)
  86                                 return (-1);
  87                         continue;
  88                 }
  89                 if (!strcmp(fsname, vfcp->vfc_name))
  90                         return (0);
  91         }
  92         errno = ENOENT;
  93         return (-1);
  94 }