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      1 /*	$NetBSD: pnullfs.c,v 1.18 2008/11/26 14:03:48 pooka 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 }
    126