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#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2018 Konstantin Belousov <kib@FreeBSD.org>
#
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
#
# Demonstrate superpage mapping.
cat > /tmp/shm_super.c <<EOF
/* $Id: shm_super.c,v 1.1 2018/10/13 23:49:37 kostik Exp kostik $ */
#include <sys/param.h>
#include <sys/mman.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define M(x) ((x) * 1024 * 1024)
#define SZ M(4)
int
main(void)
{
char buf[128];
void *ptr;
off_t cnt;
int error, shmfd;
shmfd = shm_open(SHM_ANON, O_CREAT | O_RDWR, 0600);
if (shmfd == -1)
err(1, "shm_open");
error = ftruncate(shmfd, SZ);
if (error == -1)
err(1, "truncate");
memset(buf, 0, sizeof(buf));
for (cnt = 0; cnt < SZ; cnt += sizeof(buf)) {
error = write(shmfd, buf, sizeof(buf));
if (error == -1)
err(1, "write");
else if (error != sizeof(buf))
errx(1, "short write %d", (int)error);
}
ptr = mmap(NULL, SZ, PROT_READ | PROT_WRITE, MAP_SHARED |
MAP_ALIGNED_SUPER, shmfd, 0);
if (ptr == MAP_FAILED)
err(1, "mmap");
for (cnt = 0; cnt < SZ; cnt += PAGE_SIZE)
*((char *)ptr + cnt) = 0;
printf("ptr %p\n", ptr);
snprintf(buf, sizeof(buf), "procstat -v %d", getpid());
system(buf);
}
EOF
cc -o /tmp/shm_super -Wall -Wextra -O2 -g /tmp/shm_super.c || exit 1
rm /tmp/shm_super.c
/tmp/shm_super > /tmp/shm_super.log 2>&1
grep -wq S /tmp/shm_super.log && s=0 || { cat /tmp/shm_super.log; s=1; }
rm -f /tmp/shm_super /tmp/shm_super.log
exit $s
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