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sigstackalign.c revision 1.2 
      1 /*	$NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun Exp $       */
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the NetBSD
     18  *	Foundation, Inc. and its contributors.
     19  * 4. Neither the name of The NetBSD Foundation nor the names of its
     20  *    contributors may be used to endorse or promote products derived
     21  *    from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     33  * POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/types.h>
     37 
     38 __RCSID("$NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun Exp $");
     39 
     40 #include <signal.h>
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 
     44 #define RANGE 16
     45 #define STACKALIGN 8
     46 #define BLOCKSIZE (MINSIGSTKSZ + RANGE)
     47 
     48 extern void getstackptr(int);
     49 
     50 void *stackptr;
     51 
     52 int
     53 main(int argc, char **argv)
     54 {
     55 	char *stackblock;
     56 	int i, ret;
     57 	struct sigaction sa;
     58 	stack_t ss;
     59 
     60 	ret = 0;
     61 
     62 	sa.sa_handler = getstackptr;
     63 	sigemptyset(&sa.sa_mask);
     64 	sa.sa_flags = SA_ONSTACK;
     65 	if (sigaction(SIGUSR1, &sa, NULL) != 0)
     66 		err(1, "sigaction");
     67 
     68 	stackblock = malloc(BLOCKSIZE);
     69 	for (i = 0; i < RANGE; i++) {
     70 		ss.ss_sp = stackblock;
     71 		ss.ss_size = MINSIGSTKSZ + i;
     72 		ss.ss_flags = 0;
     73 		if (sigaltstack(&ss, NULL) != 0)
     74 			err(1, "sigaltstack");
     75 		kill(getpid(), SIGUSR1);
     76 		if ((u_int)stackptr % STACKALIGN != 0) {
     77 			fprintf(stderr, "Bad stack pointer %p\n", stackptr);
     78 			ret = 1;
     79 		}
     80 #if 0
     81 		printf("i = %d, stackptr = %p\n", i, stackptr);
     82 #endif
     83 	}
     84 
     85 	return ret;
     86 }
     87 
     88