1 /* 2 * Copyright (c) 1996 - 1999 3 * HD Associates, Inc. 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by HD Associates, Inc 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 #include <unistd.h> 35 #include <stdio.h> 36 #include <errno.h> 37 #include <sys/mman.h> 38 39 #include "prutil.h" 40 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 76 int mlockall(int flags) 77 { 78 return EOPNOTSUPP; 79 } 80 81 int munlockall(void) 82 { 83 return EOPNOTSUPP; 84 } 85 86 87 #endif 88 89 #ifdef STANDALONE_TESTS 90 int main(int argc, char *argv[]) { return memlock(argc, argv); } 91 #endif 92