share/examples/puffs/pnullfs/pnullfs.c

   1 /*      $NetBSD: pnullfs.c,v 1.17 2008/09/12 14:40:46 christos Exp $    */
   2
   3 /*
   4  * Copyright (c) 2007  Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 /*
  29  * pnullfs: puffs nullfs example
  30  */
  31
  32 #include <err.h>
  33 #include <puffs.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37
  38 static void usage(void);
  39
  40 static void
  41 usage()
  42 {
  43
  44         errx(1, "usage: %s [-s] [-o mntopts] nullpath mountpath",
  45             getprogname());
  46 }
  47
  48 int
  49 main(int argc, char *argv[])
  50 {
  51         struct puffs_usermount *pu;
  52         struct puffs_ops *pops;
  53         struct puffs_pathobj *po_root;
  54         struct puffs_node *pn_root;
  55         struct stat sb;
  56         mntoptparse_t mp;
  57         int mntflags, pflags;
  58         int ch;
  59         int detach;
  60
  61         setprogname(argv[0]);
  62
  63         if (argc < 3)
  64                 usage();
  65
  66         pflags = mntflags = 0;
  67         detach = 1;
  68         while ((ch = getopt(argc, argv, "o:s")) != -1) {
  69                 switch (ch) {
  70                 case 'o':
  71                         mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
  72                         if (mp == NULL)
  73                                 err(1, "getmntopts");
  74                         freemntopts(mp);
  75                         break;
  76                 case 's':
  77                         detach = 0;
  78                         break;
  79                 }
  80         }
  81         pflags |= PUFFS_FLAG_BUILDPATH;
  82         argv += optind;
  83         argc -= optind;
  84
  85         if (pflags & PUFFS_FLAG_OPDUMP)
  86                 detach = 0;
  87
  88         if (argc != 2)
  89                 usage();
  90
  91         if (lstat(argv[0], &sb) == -1)
  92                 err(1, "stat %s", argv[0]);
  93         if ((sb.st_mode & S_IFDIR) == 0)
  94                 errx(1, "%s is not a directory", argv[0]);
  95
  96         PUFFSOP_INIT(pops);
  97         puffs_null_setops(pops);
  98
  99         if ((pu = puffs_init(pops, argv[0], "pnullfs", NULL, pflags)) == NULL)
 100                 err(1, "init");
 101
 102         pn_root = puffs_pn_new(pu, NULL);
 103         if (pn_root == NULL)
 104                 err(1, "puffs_pn_new");
 105         puffs_setroot(pu, pn_root);
 106         puffs_setfhsize(pu, 0, PUFFS_FHFLAG_PASSTHROUGH);
 107
 108         po_root = puffs_getrootpathobj(pu);
 109         if (po_root == NULL)
 110                 err(1, "getrootpathobj");
 111         po_root->po_path = argv[0];
 112         po_root->po_len = strlen(argv[0]);
 113         puffs_stat2vattr(&pn_root->pn_va, &sb);
 114
 115         if (detach)
 116                 if (puffs_daemon(pu, 1, 1) == -1)
 117                         err(1, "puffs_daemon");
 118
 119         if (puffs_mount(pu, argv[1], mntflags, pn_root) == -1)
 120                 err(1, "puffs_mount");
 121         if (puffs_mainloop(pu) == -1)
 122                 err(1, "mainloop");
 123
 124         return 0;
 125 }