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sigstackalign.c revision 1.2.32.1 
      1 /*	$NetBSD: sigstackalign.c,v 1.2.32.1 2008/05/18 12:30:47 yamt 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/types.h>
     30 
     31 __RCSID("$NetBSD: sigstackalign.c,v 1.2.32.1 2008/05/18 12:30:47 yamt Exp $");
     32 
     33 #include <signal.h>
     34 #include <stdio.h>
     35 #include <stdlib.h>
     36 
     37 #define RANGE 16
     38 #define STACKALIGN 8
     39 #define BLOCKSIZE (MINSIGSTKSZ + RANGE)
     40 
     41 extern void getstackptr(int);
     42 
     43 void *stackptr;
     44 
     45 int
     46 main(int argc, char **argv)
     47 {
     48 	char *stackblock;
     49 	int i, ret;
     50 	struct sigaction sa;
     51 	stack_t ss;
     52 
     53 	ret = 0;
     54 
     55 	sa.sa_handler = getstackptr;
     56 	sigemptyset(&sa.sa_mask);
     57 	sa.sa_flags = SA_ONSTACK;
     58 	if (sigaction(SIGUSR1, &sa, NULL) != 0)
     59 		err(1, "sigaction");
     60 
     61 	stackblock = malloc(BLOCKSIZE);
     62 	for (i = 0; i < RANGE; i++) {
     63 		ss.ss_sp = stackblock;
     64 		ss.ss_size = MINSIGSTKSZ + i;
     65 		ss.ss_flags = 0;
     66 		if (sigaltstack(&ss, NULL) != 0)
     67 			err(1, "sigaltstack");
     68 		kill(getpid(), SIGUSR1);
     69 		if ((u_int)stackptr % STACKALIGN != 0) {
     70 			fprintf(stderr, "Bad stack pointer %p\n", stackptr);
     71 			ret = 1;
     72 		}
     73 #if 0
     74 		printf("i = %d, stackptr = %p\n", i, stackptr);
     75 #endif
     76 	}
     77 
     78 	return ret;
     79 }
     80 
     81