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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1996 - 1999
* HD Associates, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by HD Associates, Inc
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <sys/mman.h>
#include "prutil.h"
int memlock(int argc, char *argv[])
{
int e = 0;
/* Is memory locking configured?
*/
errno = 0;
if (sysconf(_SC_MEMLOCK) == -1) {
if (errno != 0) {
/* This isn't valid - may be a standard violation
*/
quit("(should not happen) sysconf(_SC_MEMLOCK)");
}
else {
fprintf(stderr,
"Memory locking is not supported in this environment.\n");
e = -1;
}
}
/* Lock yourself in memory:
*/
if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
e = errno;
}
else if (munlockall() == -1) {
perror("munlockall");
e = errno;
}
return e;
}
#ifdef NO_MEMLOCK
int mlockall(int flags)
{
return EOPNOTSUPP;
}
int munlockall(void)
{
return EOPNOTSUPP;
}
#endif
#ifdef STANDALONE_TESTS
int main(int argc, char *argv[]) { return memlock(argc, argv); }
#endif
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