88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* $NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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__RCSID("$NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun Exp $");
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define RANGE 16
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#define STACKALIGN 8
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#define BLOCKSIZE (MINSIGSTKSZ + RANGE)
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extern void getstackptr(int);
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void *stackptr;
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int
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main(int argc, char **argv)
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{
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char *stackblock;
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int i, ret;
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struct sigaction sa;
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stack_t ss;
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ret = 0;
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sa.sa_handler = getstackptr;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_ONSTACK;
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if (sigaction(SIGUSR1, &sa, NULL) != 0)
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err(1, "sigaction");
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stackblock = malloc(BLOCKSIZE);
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for (i = 0; i < RANGE; i++) {
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ss.ss_sp = stackblock;
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ss.ss_size = MINSIGSTKSZ + i;
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ss.ss_flags = 0;
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if (sigaltstack(&ss, NULL) != 0)
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err(1, "sigaltstack");
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kill(getpid(), SIGUSR1);
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if ((u_int)stackptr % STACKALIGN != 0) {
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fprintf(stderr, "Bad stack pointer %p\n", stackptr);
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ret = 1;
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}
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#if 0
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printf("i = %d, stackptr = %p\n", i, stackptr);
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#endif
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}
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return ret;
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}
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