1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1996 - 1999
5 *	HD Associates, Inc.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by HD Associates, Inc
18 * 4. Neither the name of the author nor the names of any co-contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD$
35 */
36#include <unistd.h>
37#include <stdio.h>
38#include <errno.h>
39#include <sys/mman.h>
40
41#include "prutil.h"
42
43int memlock(int argc, char *argv[])
44{
45	int e = 0;
46
47	/* Is memory locking configured?
48	 */
49	errno = 0;
50	if (sysconf(_SC_MEMLOCK) == -1) {
51		if (errno != 0) {
52			/* This isn't valid - may be a standard violation
53			 */
54			quit("(should not happen) sysconf(_SC_MEMLOCK)");
55		}
56		else {
57			fprintf(stderr,
58			"Memory locking is not supported in this environment.\n");
59			e = -1;
60		}
61	}
62
63	/* Lock yourself in memory:
64	 */
65	if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
66		perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
67		e = errno;
68	}
69	else if (munlockall() == -1) {
70		perror("munlockall");
71		e = errno;
72	}
73
74	return e;
75}
76
77#ifdef NO_MEMLOCK
78int mlockall(int flags)
79{
80	return EOPNOTSUPP;
81}
82
83int munlockall(void)
84{
85	return EOPNOTSUPP;
86}
87
88
89#endif
90
91#ifdef STANDALONE_TESTS
92int main(int argc, char *argv[]) { return memlock(argc, argv); }
93#endif
94