1#!/bin/sh
2
3#
4# Copyright (c) 2013 Peter Holm <pho@FreeBSD.org>
5# 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#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26# SUCH DAMAGE.
27#
28
29# Test scenario by kib@
30# Demonstrate process looping in kernel mode.
31# Fixed in r251684.
32
33. ../default.cfg
34
35dir=/tmp
36odir=`pwd`
37cd $dir
38sed '1,/^EOF/d' < $odir/$0 > $dir/rwlock_ronly.c
39mycc -o rwlock_ronly -Wall -Wextra rwlock_ronly.c || exit 1
40rm -f rwlock_ronly.c
41cd $odir
42
43/tmp/rwlock_ronly || echo OK
44
45rm -f /tmp/rwlock_ronly
46exit
47
48EOF
49/* $Id: rwlock_ronly.c,v 1.2 2013/06/10 04:44:08 kostik Exp kostik $ */
50
51#include <sys/types.h>
52#include <sys/mman.h>
53#include <errno.h>
54#include <sys/umtx.h>
55#include <err.h>
56#include <unistd.h>
57
58int
59main(void)
60{
61	char *p;
62	struct urwlock *rw;
63	int error;
64
65	p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
66	    MAP_SHARED | MAP_ANON, -1, 0);
67	if (p == (char *)MAP_FAILED)
68		err(1, "mmap");
69
70	rw = (struct urwlock *)p;
71	rw->rw_state = URWLOCK_READ_WAITERS;
72
73	error = mprotect(p, getpagesize(), PROT_READ);
74	if (error == -1)
75		err(1, "mprotect");
76
77	error = _umtx_op(p, UMTX_OP_RW_RDLOCK, 0, NULL, NULL);
78	if (error != 0)
79		err(1, "rdlock");
80
81	return (0);
82}
83