pnullfs.c revision 1.18 
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
38static void usage(void);
39
40static void
41usage()
42{
43
44	errx(1, "usage: %s [-s] [-o mntopts] nullpath mountpath",
45	    getprogname());
46}
47
48int
49main(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