isqemu.h revision 313498 
1/*	$NetBSD: isqemu.h,v 1.4 2015/01/03 14:21:05 gson Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The NetBSD Foundation nor the names of its
19 *    contributors may be used to endorse or promote products derived
20 *    from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34#include <sys/param.h>
35#include <sys/sysctl.h>
36#include <stdbool.h>
37#include <stdlib.h>
38#include <string.h>
39#include <errno.h>
40#include <err.h>
41
42static __inline bool
43isQEMU(void) {
44#ifdef __FreeBSD__
45	char *vm_guest_name_buf;
46	size_t len;
47	bool is_vm;
48
49	if (sysctlbyname("kern.vm_guest", NULL, &len, NULL, 0) == -1)
50		err(EXIT_FAILURE, "sysctl");
51
52	if ((vm_guest_name_buf = malloc(len)) == NULL)
53		err(EXIT_FAILURE, "malloc");
54
55	if (sysctlbyname("kern.vm_guest", vm_guest_name_buf, &len, NULL, 0)
56	    == -1)
57		err(EXIT_FAILURE, "sysctl");
58
59	if (strcmp(vm_guest_name_buf, "none") == 0)
60		is_vm = false;
61	else
62		is_vm = true;
63
64	free(vm_guest_name_buf);
65
66	return is_vm;
67#else
68#if defined(__i386__) || defined(__x86_64__)
69	char name[1024];
70	size_t len = sizeof(name);
71
72	if (sysctlbyname("machdep.cpu_brand", name, &len, NULL, 0) == -1) {
73		if (errno == ENOENT)
74			return false;
75		err(EXIT_FAILURE, "sysctl");
76	}
77	return strstr(name, "QEMU") != NULL;
78#else
79	return false;
80#endif
81#endif
82}
83
84#ifdef TEST
85int
86main(void) {
87	return isQEMU();
88}
89#endif
90