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#include <unistd.h>
35#include <stdio.h>
36#include <errno.h>
37#include <sys/mman.h>
38
39#include "prutil.h"
40
41int memlock(int argc, char *argv[])
42{
43	int e = 0;
44
45	/* Is memory locking configured?
46	 */
47	errno = 0;
48	if (sysconf(_SC_MEMLOCK) == -1) {
49		if (errno != 0) {
50			/* This isn't valid - may be a standard violation
51			 */
52			quit("(should not happen) sysconf(_SC_MEMLOCK)");
53		}
54		else {
55			fprintf(stderr,
56			"Memory locking is not supported in this environment.\n");
57			e = -1;
58		}
59	}
60
61	/* Lock yourself in memory:
62	 */
63	if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
64		perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
65		e = errno;
66	}
67	else if (munlockall() == -1) {
68		perror("munlockall");
69		e = errno;
70	}
71
72	return e;
73}
74
75#ifdef NO_MEMLOCK
76int mlockall(int flags)
77{
78	return EOPNOTSUPP;
79}
80
81int munlockall(void)
82{
83	return EOPNOTSUPP;
84}
85
86
87#endif
88
89#ifdef STANDALONE_TESTS
90int main(int argc, char *argv[]) { return memlock(argc, argv); }
91#endif
92