83 lines
2.3 KiB
Bash
Executable File
83 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2013 Peter Holm <pho@FreeBSD.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# Test scenario by kib@
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# Demonstrate process looping in kernel mode.
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# Fixed in r251684.
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. ../default.cfg
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/rwlock_ronly.c
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mycc -o rwlock_ronly -Wall -Wextra rwlock_ronly.c || exit 1
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rm -f rwlock_ronly.c
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cd $odir
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/tmp/rwlock_ronly || echo OK
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rm -f /tmp/rwlock_ronly
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exit
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EOF
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/* $Id: rwlock_ronly.c,v 1.2 2013/06/10 04:44:08 kostik Exp kostik $ */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <sys/umtx.h>
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#include <err.h>
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#include <unistd.h>
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int
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main(void)
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{
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char *p;
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struct urwlock *rw;
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int error;
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p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_ANON, -1, 0);
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if (p == (char *)MAP_FAILED)
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err(1, "mmap");
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rw = (struct urwlock *)p;
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rw->rw_state = URWLOCK_READ_WAITERS;
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error = mprotect(p, getpagesize(), PROT_READ);
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if (error == -1)
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err(1, "mprotect");
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error = _umtx_op(p, UMTX_OP_RW_RDLOCK, 0, NULL, NULL);
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if (error != 0)
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err(1, "rdlock");
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return (0);
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}
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