geom_getxml.c revision 169162 
1/*-
2 * Copyright (c) 2003 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The names of the authors may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/lib/libgeom/geom_getxml.c 169162 2007-05-01 10:47:09Z wkoszek $
30 */
31
32#include <sys/types.h>
33#include <sys/sysctl.h>
34#include <stdlib.h>
35#include <string.h>
36#include "libgeom.h"
37
38char *
39geom_getxml()
40{
41	char *p;
42	size_t l;
43	int i;
44
45	l = 1024 * 1024;	/* Start big, realloc back */
46	p = malloc(l);
47	if (p) {
48		i = sysctlbyname("kern.geom.confxml", p, &l, NULL, 0);
49		if (i == 0) {
50			p = realloc(p, strlen(p) + 1);
51			return (p);
52		}
53		free(p);
54	}
55	l = 0;
56	i = sysctlbyname("kern.geom.confxml", NULL, &l, NULL, 0);
57	if (i != 0)
58		return (NULL);
59	p = malloc(l + 4096);
60	i = sysctlbyname("kern.geom.confxml", p, &l, NULL, 0);
61	if (i == 0) {
62		p = realloc(p, strlen(p) + 1);
63		return (p);
64	}
65	return (NULL);
66}
67