usr/src/cmd/fs.d/deffs.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 /*
  24  * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
  25  */
  26
  27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990, 1991, 1997 SMI     */
  28 /* All Rights Reserved                                                  */
  29
  30 #include <stdio.h>
  31 #include <deflt.h>
  32 #include <string.h>
  33
  34 #define LOCAL           "/etc/default/fs"
  35 #define REMOTE          "/etc/dfs/fstypes"
  36
  37 /*
  38  * This is used to figure out the default file system type if "-F FStype"
  39  * is not specified with the file system command and no entry in the
  40  * /etc/vfstab matches the specified special.
  41  * If the first character of the "special" is a "/" (eg, "/dev/dsk/c0d1s2"),
  42  * returns the default local filesystem type.
  43  * Otherwise (eg, "server:/path/name" or "resource"), returns the default
  44  * remote filesystem type.
  45  */
  46 char    *
  47 default_fstype(char *special)
  48 {
  49         char    *deffs = NULL;
  50         static  char    buf[BUFSIZ];
  51         FILE    *fp;
  52
  53         if (*special == '/') {
  54                 if (defopen(LOCAL) == 0) {
  55                         deffs = defread("LOCAL=");
  56                         defopen(NULL);  /* close default file */
  57                 }
  58         } else {
  59                 if ((fp = fopen(REMOTE, "r")) != NULL) {
  60                         if (fgets(buf, sizeof (buf), fp) != NULL)
  61                                 deffs = strtok(buf, " \t\n");
  62                         fclose(fp);
  63                 }
  64                 if (deffs == NULL)
  65                         deffs = "nfs";
  66         }
  67
  68         return (deffs != NULL ? deffs : "ufs");
  69 }