tools/regression/p1003_1b/memlock.c

   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: src/tools/regression/p1003_1b/memlock.c,v 1.1 2000/02/16 14:28:40 dufault Exp $
  33  * $DragonFly: src/tools/regression/p1003_1b/memlock.c,v 1.2 2003/06/17 04:29:11 dillon Exp $
  34  */
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <errno.h>
  38 #include <sys/mman.h>
  39
  40 #include "prutil.h"
  41
  42 int memlock(int argc, char *argv[])
  43 {
  44         int e = 0;
  45
  46         /* Is memory locking configured?
  47          */
  48         errno = 0;
  49         if (sysconf(_SC_MEMLOCK) == -1) {
  50                 if (errno != 0) {
  51                         /* This isn't valid - may be a standard violation
  52                          */
  53                         quit("(should not happen) sysconf(_SC_MEMLOCK)");
  54                 }
  55                 else {
  56                         fprintf(stderr,
  57                         "Memory locking is not supported in this environment.\n");
  58                         e = -1;
  59                 }
  60         }
  61
  62         /* Lock yourself in memory:
  63          */
  64         if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
  65                 perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
  66                 e = errno;
  67         }
  68         else if (munlockall() == -1) {
  69                 perror("munlockall");
  70                 e = errno;
  71         }
  72
  73         return e;
  74 }
  75
  76 #ifdef NO_MEMLOCK
  77 int mlockall(int flags)
  78 {
  79         return EOPNOTSUPP;
  80 }
  81
  82 int munlockall(void)
  83 {
  84         return EOPNOTSUPP;
  85 }
  86
  87
  88 #endif
  89
  90 #ifdef STANDALONE_TESTS
  91 int main(int argc, char *argv[]) { return memlock(argc, argv); }
  92 #endif