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
memlock(int argc,char * argv[])41 int 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
mlockall(int flags)76 int mlockall(int flags)
77 {
78 return EOPNOTSUPP;
79 }
80
munlockall(void)81 int munlockall(void)
82 {
83 return EOPNOTSUPP;
84 }
85
86
87 #endif
88
89 #ifdef STANDALONE_TESTS
main(int argc,char * argv[])90 int main(int argc, char *argv[]) { return memlock(argc, argv); }
91 #endif
92