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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990, 1991, 1997 SMI     */
  23 /* All Rights Reserved                                                  */
  24
  25 #ident  "%Z%%M% %I%     %E% SMI"
  26
  27 #include        <stdio.h>
  28 #include        <deflt.h>
  29 #include        <string.h>
  30
  31 #define LOCAL           "/etc/default/fs"
  32 #define REMOTE          "/etc/dfs/fstypes"
  33
  34 /*
  35  * This is used to figure out the default file system type if "-F FStype"
  36  * is not specified with the file system command and no entry in the
  37  * /etc/vfstab matches the specified special.
  38  * If the first character of the "special" is a "/" (eg, "/dev/dsk/c0d1s2"),
  39  * returns the default local filesystem type.
  40  * Otherwise (eg, "server:/path/name" or "resource"), returns the default
  41  * remote filesystem type.
  42  */
  43 char    *
  44 default_fstype(char *special)
  45 {
  46         char    *deffs;
  47         static  char    buf[BUFSIZ];
  48         FILE    *fp;
  49
  50         if (*special == '/') {
  51                 if (defopen(LOCAL) != 0)
  52                         return ("ufs");
  53                 else {
  54                         if ((deffs = defread("LOCAL=")) == NULL) {
  55                                 defopen(NULL);  /* close default file */
  56                                 return ("ufs");
  57                         } else {
  58                                 defopen(NULL);  /* close default file */
  59                                 return (deffs);
  60                         }
  61                 }
  62         } else {
  63                 if ((fp = fopen(REMOTE, "r")) == NULL)
  64                         return ("nfs");
  65                 else {
  66                         if (fgets(buf, sizeof (buf), fp) == NULL) {
  67                                 fclose(fp);
  68                                 return ("nfs");
  69                         } else {
  70                                 deffs = strtok(buf, " \t\n");
  71                                 fclose(fp);
  72                                 return (deffs);
  73                         }
  74                 }
  75         }
  76 }